| ... | ... | @@ -25,55 +25,102 @@ ni: Node.Known, |
| 25 | 25 | nodes: std.MultiArrayList(Node), |
| 26 | 26 | shdrs: std.ArrayList(Section), |
| 27 | 27 | phdrs: std.ArrayList(MappedFile.Node.Index), |
| 28 | | si: Symbol.Known, |
| 28 | shndx: struct { |
| 29 | got: Section.Index, |
| 30 | got_plt: Section.Index, |
| 31 | plt: Section.Index, |
| 32 | plt_sec: Section.Index, |
| 33 | dynsym: Section.Index, |
| 34 | dynstr: Section.Index, |
| 35 | dynamic: Section.Index, |
| 36 | tdata: Section.Index, |
| 37 | }, |
| 29 | 38 | symtab: std.ArrayList(Symbol), |
| 39 | globals: struct { |
| 40 | strong_def: std.array_hash_map.Auto(String(.strtab), Symbol.Global), |
| 41 | weak_def: std.array_hash_map.Auto(String(.strtab), Symbol.Global), |
| 42 | strong_undef: std.array_hash_map.Auto(String(.strtab), Symbol.Global), |
| 43 | weak_undef: std.array_hash_map.Auto(String(.strtab), Symbol.Global), |
| 44 | }, |
| 45 | /// Key is a node which is a valid `Symbol.node` value, value is the name of the first global symbol |
| 46 | /// in that node. That symbol is the head of a linked list: see `Symbol.Global.next_in_node`. |
| 47 | /// |
| 48 | /// Value is never `.empty`. |
| 49 | /// |
| 50 | /// We use a separate hash map for this data rather than storing it in `navs` etc to save memory, |
| 51 | /// because the vast majority of nodes which can export global symbols actually will not. |
| 52 | node_global_symbols: std.array_hash_map.Auto(MappedFile.Node.Index, String(.strtab)), |
| 30 | 53 | shstrtab: StringTable, |
| 31 | 54 | strtab: StringTable, |
| 32 | | dynsym: std.AutoArrayHashMapUnmanaged(Symbol.Index, void), |
| 33 | 55 | dynstr: StringTable, |
| 34 | 56 | got: struct { |
| 35 | 57 | len: u32, |
| 36 | 58 | tlsld: GotIndex, |
| 37 | | plt: std.AutoArrayHashMapUnmanaged(Symbol.Index, void), |
| 59 | plt: std.AutoArrayHashMapUnmanaged(Symbol.Id, void), |
| 38 | 60 | }, |
| 39 | | needed: std.AutoArrayHashMapUnmanaged(u32, void), |
| 61 | first_plt_reloc: Reloc.Index, |
| 62 | first_dynamic_reloc: Reloc.Index, |
| 63 | needed: std.AutoArrayHashMapUnmanaged(String(.dynstr), void), |
| 40 | 64 | inputs: std.ArrayList(struct { |
| 41 | 65 | path: std.Build.Cache.Path, |
| 42 | 66 | member: ?[]const u8, |
| 43 | | si: Symbol.Index, |
| 44 | | }), |
| 45 | | input_sections: std.ArrayList(struct { |
| 46 | | ii: Node.InputIndex, |
| 47 | | file_location: MappedFile.Node.FileLocation, |
| 48 | | si: Symbol.Index, |
| 67 | file_symbol: Symbol.LocalIndex, |
| 49 | 68 | }), |
| 69 | input_sections: std.ArrayList(InputSection), |
| 50 | 70 | input_section_pending_index: u32, |
| 51 | | globals: std.AutoArrayHashMapUnmanaged(u32, Symbol.Index), |
| 52 | | navs: std.AutoArrayHashMapUnmanaged(InternPool.Nav.Index, Symbol.Index), |
| 53 | | uavs: std.AutoArrayHashMapUnmanaged(InternPool.Index, Symbol.Index), |
| 71 | navs: std.AutoArrayHashMapUnmanaged(InternPool.Nav.Index, struct { |
| 72 | /// The start index of the contiguous sequence of relocations in this NAV. |
| 73 | first_reloc: Reloc.Index, |
| 74 | lsi: Symbol.LocalIndex, |
| 75 | }), |
| 76 | uavs: std.AutoArrayHashMapUnmanaged(InternPool.Index, struct { |
| 77 | /// The start index of the contiguous sequence of relocations in this UAV. |
| 78 | first_reloc: Reloc.Index, |
| 79 | lsi: Symbol.LocalIndex, |
| 80 | }), |
| 54 | 81 | lazy: std.EnumArray(link.File.LazySymbol.Kind, struct { |
| 55 | | map: std.AutoArrayHashMapUnmanaged(InternPool.Index, Symbol.Index), |
| 82 | map: std.AutoArrayHashMapUnmanaged(InternPool.Index, struct { |
| 83 | /// The start index of the contiguous sequence of relocations in this lazy code/data. |
| 84 | first_reloc: Reloc.Index, |
| 85 | lsi: Symbol.LocalIndex, |
| 86 | }), |
| 56 | 87 | pending_index: u32, |
| 57 | 88 | }), |
| 58 | | pending_uavs: std.AutoArrayHashMapUnmanaged(Node.UavMapIndex, struct { |
| 59 | | alignment: InternPool.Alignment, |
| 60 | | src_loc: Zcu.LazySrcLoc, |
| 61 | | }), |
| 89 | pending_uavs: std.ArrayList(Node.UavMapIndex), |
| 62 | 90 | relocs: std.ArrayList(Reloc), |
| 91 | |
| 92 | /// Key is the name of a global symbol which has been moved to a new symtab index. Any relocation |
| 93 | /// entries which target that symbol must be updated to reference the correct symbol index. |
| 94 | changed_symtab_index: std.array_hash_map.Auto(String(.strtab), void), |
| 95 | |
| 63 | 96 | const_prog_node: std.Progress.Node, |
| 64 | 97 | synth_prog_node: std.Progress.Node, |
| 65 | 98 | input_prog_node: std.Progress.Node, |
| 66 | 99 | |
| 67 | | pub const Node = union(enum) { |
| 100 | const Node = union(enum) { |
| 101 | /// Cannot contain relocations. |
| 68 | 102 | file, |
| 103 | /// Cannot contain relocations. |
| 69 | 104 | ehdr, |
| 105 | /// Cannot contain relocations. |
| 70 | 106 | shdr, |
| 107 | /// Cannot contain relocations. |
| 71 | 108 | segment: u32, |
| 72 | | section: Symbol.Index, |
| 73 | | input_section: InputSectionIndex, |
| 109 | /// The section '.plt' may contain relocations via `elf.first_plt_reloc`. |
| 110 | /// |
| 111 | /// The section '.dynamic' may contain relocations via `elf.first_dynamic_reloc`. |
| 112 | /// |
| 113 | /// Otherwise, cannot contain relocations. |
| 114 | section: Section.Index, |
| 115 | /// May contain relocations through the `first_reloc` field in `elf.input_sections`. |
| 116 | input_section: InputSection.Index, |
| 117 | /// May contain relocations through the `first_reloc` field in `elf.navs`. |
| 74 | 118 | nav: NavMapIndex, |
| 119 | /// May contain relocations through the `first_reloc` field in `elf.uavs`. |
| 75 | 120 | uav: UavMapIndex, |
| 121 | /// May contain relocations through the `first_reloc` field in `elf.lazy.map`. |
| 76 | 122 | lazy_code: LazyMapRef.Index(.code), |
| 123 | /// May contain relocations through the `first_reloc` field in `elf.lazy.map`. |
| 77 | 124 | lazy_const_data: LazyMapRef.Index(.const_data), |
| 78 | 125 | |
| 79 | 126 | pub const InputIndex = enum(u32) { |
| ... | ... | @@ -87,32 +134,20 @@ pub const Node = union(enum) { |
| 87 | 134 | return elf.inputs.items[@intFromEnum(ii)].member; |
| 88 | 135 | } |
| 89 | 136 | |
| 90 | | pub fn symbol(ii: InputIndex, elf: *const Elf) Symbol.Index { |
| 91 | | return elf.inputs.items[@intFromEnum(ii)].si; |
| 92 | | } |
| 93 | | |
| 94 | | pub fn endSymbol(ii: InputIndex, elf: *const Elf) Symbol.Index { |
| 95 | | const next_ii = @intFromEnum(ii) + 1; |
| 96 | | return if (next_ii < elf.inputs.items.len) |
| 97 | | @as(InputIndex, @enumFromInt(next_ii)).symbol(elf) |
| 98 | | else |
| 99 | | @enumFromInt(elf.symtab.items.len); |
| 100 | | } |
| 101 | | }; |
| 102 | | |
| 103 | | pub const InputSectionIndex = enum(u32) { |
| 104 | | _, |
| 105 | | |
| 106 | | pub fn input(isi: InputSectionIndex, elf: *const Elf) InputIndex { |
| 107 | | return elf.input_sections.items[@intFromEnum(isi)].ii; |
| 137 | pub fn fileSymbol(ii: InputIndex, elf: *const Elf) Symbol.LocalIndex { |
| 138 | return elf.inputs.items[@intFromEnum(ii)].file_symbol; |
| 108 | 139 | } |
| 109 | 140 | |
| 110 | | pub fn fileLocation(isi: InputSectionIndex, elf: *const Elf) MappedFile.Node.FileLocation { |
| 111 | | return elf.input_sections.items[@intFromEnum(isi)].file_location; |
| 112 | | } |
| 113 | | |
| 114 | | pub fn symbol(isi: InputSectionIndex, elf: *const Elf) Symbol.Index { |
| 115 | | return elf.input_sections.items[@intFromEnum(isi)].si; |
| 141 | pub fn localSymbolRange(ii: InputIndex, elf: *Elf) [2]Symbol.LocalIndex { |
| 142 | if (@intFromEnum(ii) + 1 < elf.inputs.items.len) { |
| 143 | const next_ii: InputIndex = @enumFromInt(@intFromEnum(ii) + 1); |
| 144 | return .{ ii.fileSymbol(elf), next_ii.fileSymbol(elf) }; |
| 145 | } else { |
| 146 | const local_symbols_len = switch (elf.shdrPtr(.symtab)) { |
| 147 | inline else => |shdr| elf.targetLoad(&shdr.info), |
| 148 | }; |
| 149 | return .{ ii.fileSymbol(elf), @enumFromInt(local_symbols_len) }; |
| 150 | } |
| 116 | 151 | } |
| 117 | 152 | }; |
| 118 | 153 | |
| ... | ... | @@ -123,8 +158,12 @@ pub const Node = union(enum) { |
| 123 | 158 | return elf.navs.keys()[@intFromEnum(nmi)]; |
| 124 | 159 | } |
| 125 | 160 | |
| 126 | | pub fn symbol(nmi: NavMapIndex, elf: *const Elf) Symbol.Index { |
| 127 | | return elf.navs.values()[@intFromEnum(nmi)]; |
| 161 | pub fn symbol(nmi: NavMapIndex, elf: *const Elf) Symbol.LocalIndex { |
| 162 | return elf.navs.values()[@intFromEnum(nmi)].lsi; |
| 163 | } |
| 164 | |
| 165 | fn firstReloc(nmi: NavMapIndex, elf: *const Elf) Reloc.Index { |
| 166 | return elf.navs.values()[@intFromEnum(nmi)].first_reloc; |
| 128 | 167 | } |
| 129 | 168 | }; |
| 130 | 169 | |
| ... | ... | @@ -135,8 +174,12 @@ pub const Node = union(enum) { |
| 135 | 174 | return elf.uavs.keys()[@intFromEnum(umi)]; |
| 136 | 175 | } |
| 137 | 176 | |
| 138 | | pub fn symbol(umi: UavMapIndex, elf: *const Elf) Symbol.Index { |
| 139 | | return elf.uavs.values()[@intFromEnum(umi)]; |
| 177 | pub fn symbol(umi: UavMapIndex, elf: *const Elf) Symbol.LocalIndex { |
| 178 | return elf.uavs.values()[@intFromEnum(umi)].lsi; |
| 179 | } |
| 180 | |
| 181 | fn firstReloc(umi: UavMapIndex, elf: *const Elf) Reloc.Index { |
| 182 | return elf.uavs.values()[@intFromEnum(umi)].first_reloc; |
| 140 | 183 | } |
| 141 | 184 | }; |
| 142 | 185 | |
| ... | ... | @@ -156,9 +199,13 @@ pub const Node = union(enum) { |
| 156 | 199 | return lmi.ref().lazySymbol(elf); |
| 157 | 200 | } |
| 158 | 201 | |
| 159 | | pub fn symbol(lmi: @This(), elf: *const Elf) Symbol.Index { |
| 202 | pub fn symbol(lmi: @This(), elf: *const Elf) Symbol.LocalIndex { |
| 160 | 203 | return lmi.ref().symbol(elf); |
| 161 | 204 | } |
| 205 | |
| 206 | fn firstReloc(lmi: @This(), elf: *const Elf) Reloc.Index { |
| 207 | return lmi.ref().firstReloc(elf); |
| 208 | } |
| 162 | 209 | }; |
| 163 | 210 | } |
| 164 | 211 | |
| ... | ... | @@ -166,8 +213,12 @@ pub const Node = union(enum) { |
| 166 | 213 | return .{ .kind = lmr.kind, .ty = elf.lazy.getPtrConst(lmr.kind).map.keys()[lmr.index] }; |
| 167 | 214 | } |
| 168 | 215 | |
| 169 | | pub fn symbol(lmr: LazyMapRef, elf: *const Elf) Symbol.Index { |
| 170 | | return elf.lazy.getPtrConst(lmr.kind).map.values()[lmr.index]; |
| 216 | pub fn symbol(lmr: LazyMapRef, elf: *const Elf) Symbol.LocalIndex { |
| 217 | return elf.lazy.getPtrConst(lmr.kind).map.values()[lmr.index].lsi; |
| 218 | } |
| 219 | |
| 220 | fn firstReloc(lmr: LazyMapRef, elf: *const Elf) Reloc.Index { |
| 221 | return elf.lazy.getPtrConst(lmr.kind).map.values()[lmr.index].first_reloc; |
| 171 | 222 | } |
| 172 | 223 | }; |
| 173 | 224 | |
| ... | ... | @@ -180,17 +231,66 @@ pub const Node = union(enum) { |
| 180 | 231 | comptime text: MappedFile.Node.Index = @enumFromInt(5), |
| 181 | 232 | comptime data: MappedFile.Node.Index = @enumFromInt(6), |
| 182 | 233 | comptime data_rel_ro: MappedFile.Node.Index = @enumFromInt(7), |
| 234 | |
| 183 | 235 | tls: MappedFile.Node.Index, |
| 184 | 236 | }; |
| 185 | 237 | |
| 186 | 238 | comptime { |
| 187 | 239 | if (!std.debug.runtime_safety) std.debug.assert(@sizeOf(Node) == 8); |
| 188 | 240 | } |
| 241 | |
| 242 | /// In this linker implementation, `link.File.AtomId` is a type-erased `MappedFile.Node.Index`. |
| 243 | fn toAtom(ni: MappedFile.Node.Index) link.File.AtomId { |
| 244 | return @enumFromInt(@intFromEnum(ni)); |
| 245 | } |
| 246 | /// In this linker implementation, `link.File.AtomId` is a type-erased `MappedFile.Node.Index`. |
| 247 | fn fromAtom(atom: link.File.AtomId) MappedFile.Node.Index { |
| 248 | return @enumFromInt(@intFromEnum(atom)); |
| 249 | } |
| 189 | 250 | }; |
| 190 | 251 | |
| 191 | | pub const Section = struct { |
| 192 | | si: Symbol.Index, |
| 193 | | rela_si: Symbol.Index, |
| 252 | const InputSection = struct { |
| 253 | input: Node.InputIndex, |
| 254 | file_location: MappedFile.Node.FileLocation, |
| 255 | vaddr: u64, |
| 256 | /// The node corresponding to this input section. |
| 257 | node: MappedFile.Node.Index, |
| 258 | /// The start index of the contiguous sequence of relocations in this input section. |
| 259 | first_reloc: Reloc.Index, |
| 260 | |
| 261 | const Index = enum(u32) { |
| 262 | _, |
| 263 | |
| 264 | fn ptr(isi: InputSection.Index, elf: *Elf) *InputSection { |
| 265 | return &elf.input_sections.items[@intFromEnum(isi)]; |
| 266 | } |
| 267 | |
| 268 | fn ptrConst(isi: InputSection.Index, elf: *const Elf) *const InputSection { |
| 269 | return &elf.input_sections.items[@intFromEnum(isi)]; |
| 270 | } |
| 271 | |
| 272 | fn input(isi: InputSection.Index, elf: *const Elf) Node.InputIndex { |
| 273 | return isi.ptrConst(elf).input; |
| 274 | } |
| 275 | |
| 276 | fn fileLocation(isi: InputSection.Index, elf: *const Elf) MappedFile.Node.FileLocation { |
| 277 | return isi.ptrConst(elf).file_location; |
| 278 | } |
| 279 | |
| 280 | fn node(isi: InputSection.Index, elf: *const Elf) MappedFile.Node.Index { |
| 281 | return isi.ptrConst(elf).node; |
| 282 | } |
| 283 | }; |
| 284 | }; |
| 285 | |
| 286 | const Section = struct { |
| 287 | /// The node corresponding to this section. |
| 288 | ni: MappedFile.Node.Index, |
| 289 | /// A symbol which is exactly at the start of this section. |
| 290 | /// |
| 291 | /// If the section does not have flag `std.elf.SHF.ALLOC`, this is `.null`. |
| 292 | lsi: Symbol.LocalIndex, |
| 293 | rela_shndx: Section.Index, |
| 194 | 294 | rela_free: RelIndex, |
| 195 | 295 | |
| 196 | 296 | pub const RelIndex = enum(u32) { |
| ... | ... | @@ -207,394 +307,1165 @@ pub const Section = struct { |
| 207 | 307 | }; |
| 208 | 308 | } |
| 209 | 309 | }; |
| 210 | | }; |
| 211 | 310 | |
| 212 | | pub const Symbol = struct { |
| 213 | | ni: MappedFile.Node.Index, |
| 214 | | /// Relocations contained within this symbol |
| 215 | | loc_relocs: Reloc.Index, |
| 216 | | /// Relocations targeting this symbol |
| 217 | | target_relocs: Reloc.Index, |
| 218 | | unused: u32, |
| 311 | pub const Index = enum(Tag) { |
| 312 | UNDEF = std.elf.SHN_UNDEF, |
| 313 | LIVEPATCH = reserve(std.elf.SHN_LIVEPATCH), |
| 314 | ABS = reserve(std.elf.SHN_ABS), |
| 315 | COMMON = reserve(std.elf.SHN_COMMON), |
| 219 | 316 | |
| 220 | | pub const Index = enum(u32) { |
| 221 | | null, |
| 222 | | symtab, |
| 317 | symtab = 1, |
| 223 | 318 | shstrtab, |
| 224 | 319 | strtab, |
| 225 | 320 | rodata, |
| 226 | 321 | text, |
| 227 | 322 | data, |
| 228 | 323 | data_rel_ro, |
| 229 | | got, |
| 230 | | got_plt, |
| 231 | | plt, |
| 232 | | plt_sec, |
| 324 | |
| 233 | 325 | _, |
| 234 | 326 | |
| 235 | | pub fn get(si: Symbol.Index, elf: *Elf) *Symbol { |
| 236 | | return &elf.symtab.items[@intFromEnum(si)]; |
| 327 | pub const Tag = u32; |
| 328 | |
| 329 | pub const LORESERVE: Index = .fromSection(std.elf.SHN_LORESERVE); |
| 330 | pub const HIRESERVE: Index = .fromSection(std.elf.SHN_HIRESERVE); |
| 331 | comptime { |
| 332 | assert(@intFromEnum(HIRESERVE) == std.math.maxInt(Tag)); |
| 237 | 333 | } |
| 238 | 334 | |
| 239 | | pub fn node(si: Symbol.Index, elf: *Elf) MappedFile.Node.Index { |
| 240 | | const ni = si.get(elf).ni; |
| 241 | | assert(ni != .none); |
| 242 | | return ni; |
| 335 | fn reserve(sec: std.elf.Section) Tag { |
| 336 | assert(sec >= std.elf.SHN_LORESERVE and sec <= std.elf.SHN_HIRESERVE); |
| 337 | return @as(Tag, std.math.maxInt(Tag) - std.elf.SHN_HIRESERVE) + sec; |
| 243 | 338 | } |
| 244 | 339 | |
| 245 | | pub fn next(si: Symbol.Index) Symbol.Index { |
| 246 | | return @enumFromInt(@intFromEnum(si) + 1); |
| 340 | pub fn fromSection(sec: std.elf.Section) Index { |
| 341 | return switch (sec) { |
| 342 | std.elf.SHN_UNDEF...std.elf.SHN_LORESERVE - 1 => @enumFromInt(sec), |
| 343 | std.elf.SHN_LORESERVE...std.elf.SHN_HIRESERVE => @enumFromInt(reserve(sec)), |
| 344 | }; |
| 345 | } |
| 346 | pub fn toSection(s: Index) ?std.elf.Section { |
| 347 | return switch (@intFromEnum(s)) { |
| 348 | std.elf.SHN_UNDEF...std.elf.SHN_LORESERVE - 1 => |sec| @intCast(sec), |
| 349 | std.elf.SHN_LORESERVE...reserve(std.elf.SHN_LORESERVE) - 1 => null, |
| 350 | reserve(std.elf.SHN_LORESERVE)...reserve(std.elf.SHN_HIRESERVE) => |sec| @intCast( |
| 351 | sec - reserve(std.elf.SHN_LORESERVE) + std.elf.SHN_LORESERVE, |
| 352 | ), |
| 353 | }; |
| 247 | 354 | } |
| 248 | 355 | |
| 249 | | pub const Shndx = enum(Tag) { |
| 250 | | UNDEF = std.elf.SHN_UNDEF, |
| 251 | | LIVEPATCH = reserve(std.elf.SHN_LIVEPATCH), |
| 252 | | ABS = reserve(std.elf.SHN_ABS), |
| 253 | | COMMON = reserve(std.elf.SHN_COMMON), |
| 254 | | _, |
| 356 | fn get(s: Index, elf: *Elf) *Section { |
| 357 | return &elf.shdrs.items[@intFromEnum(s)]; |
| 358 | } |
| 255 | 359 | |
| 256 | | pub const Tag = u32; |
| 360 | fn name(s: Index, elf: *Elf) [:0]const u8 { |
| 361 | const str: String(.shstrtab) = switch (elf.shdrPtr(s)) { |
| 362 | inline else => |shdr| @enumFromInt(elf.targetLoad(&shdr.name)), |
| 363 | }; |
| 364 | return str.slice(elf); |
| 365 | } |
| 257 | 366 | |
| 258 | | pub const LORESERVE: Shndx = .fromSection(std.elf.SHN_LORESERVE); |
| 259 | | pub const HIRESERVE: Shndx = .fromSection(std.elf.SHN_HIRESERVE); |
| 260 | | comptime { |
| 261 | | assert(@intFromEnum(HIRESERVE) == std.math.maxInt(Tag)); |
| 262 | | } |
| 367 | fn vaddr(s: Index, elf: *Elf) u64 { |
| 368 | return switch (s.get(elf).lsi) { |
| 369 | .null => 0, |
| 370 | else => |lsi| Symbol.Id.local(lsi).value(elf), |
| 371 | }; |
| 372 | } |
| 263 | 373 | |
| 264 | | fn reserve(sec: std.elf.Section) Tag { |
| 265 | | assert(sec >= std.elf.SHN_LORESERVE and sec <= std.elf.SHN_HIRESERVE); |
| 266 | | return @as(Tag, std.math.maxInt(Tag) - std.elf.SHN_HIRESERVE) + sec; |
| 374 | fn rename(shndx: Index, elf: *Elf, new_name: []const u8) !void { |
| 375 | const shstrtab_entry = try elf.string(.shstrtab, new_name); |
| 376 | switch (elf.shdrPtr(shndx)) { |
| 377 | inline else => |shdr| elf.targetStore(&shdr.name, @intFromEnum(shstrtab_entry)), |
| 267 | 378 | } |
| 379 | } |
| 380 | }; |
| 381 | }; |
| 382 | |
| 383 | fn ensureUnusedSymbolCapacity(elf: *Elf, len: u32, kind: enum { all_local, maybe_global }) !void { |
| 384 | const gpa = elf.base.comp.gpa; |
| 385 | |
| 386 | try elf.symtab.ensureUnusedCapacity(gpa, len); |
| 387 | |
| 388 | // If adding locals, we may need to move one global out of the way for each local. If adding |
| 389 | // globals, they could all get demoted to STB_LOCAL, which would mean we move those N globals |
| 390 | // *and* we move up to N other globals out of their way. |
| 391 | try elf.changed_symtab_index.ensureUnusedCapacity(gpa, switch (kind) { |
| 392 | .all_local => len, |
| 393 | .maybe_global => len * 2, |
| 394 | }); |
| 395 | |
| 396 | { |
| 397 | // Ensure the symtab section's node is big enough |
| 398 | const need_node_size: u64 = switch (elf.shdrPtr(.symtab)) { |
| 399 | inline else => |shdr, class| elf.targetLoad(&shdr.size) + len * @sizeOf(class.ElfN().Sym), |
| 400 | }; |
| 401 | _, const cur_node_size = Section.Index.symtab.get(elf).ni.location(&elf.mf).resolve(&elf.mf); |
| 402 | if (cur_node_size < need_node_size) { |
| 403 | const new_node_size = need_node_size +| need_node_size / MappedFile.growth_factor; |
| 404 | try Section.Index.symtab.get(elf).ni.resize(&elf.mf, gpa, new_node_size); |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | switch (kind) { |
| 409 | .all_local => {}, |
| 410 | .maybe_global => { |
| 411 | try elf.globals.strong_def.ensureUnusedCapacity(gpa, len); |
| 412 | try elf.globals.weak_def.ensureUnusedCapacity(gpa, len); |
| 413 | try elf.globals.strong_undef.ensureUnusedCapacity(gpa, len); |
| 414 | try elf.globals.weak_undef.ensureUnusedCapacity(gpa, len); |
| 415 | |
| 416 | try elf.node_global_symbols.ensureUnusedCapacity(gpa, len); |
| 268 | 417 | |
| 269 | | pub fn fromSection(sec: std.elf.Section) Shndx { |
| 270 | | return switch (sec) { |
| 271 | | std.elf.SHN_UNDEF...std.elf.SHN_LORESERVE - 1 => @enumFromInt(sec), |
| 272 | | std.elf.SHN_LORESERVE...std.elf.SHN_HIRESERVE => @enumFromInt(reserve(sec)), |
| 418 | if (elf.shndx.dynsym != .UNDEF) { |
| 419 | // Ensure the `.dynsym` section's node is big enough |
| 420 | const dynsym_need_size: u64 = switch (elf.shdrPtr(elf.shndx.dynsym)) { |
| 421 | inline else => |shdr, class| elf.targetLoad(&shdr.size) + len * @sizeOf(class.ElfN().Sym), |
| 273 | 422 | }; |
| 423 | _, const dynsym_cur_size = elf.shndx.dynsym.get(elf).ni.location(&elf.mf).resolve(&elf.mf); |
| 424 | if (dynsym_cur_size < dynsym_need_size) { |
| 425 | const new_size = dynsym_need_size +| dynsym_need_size / MappedFile.growth_factor; |
| 426 | try elf.shndx.dynsym.get(elf).ni.resize(&elf.mf, gpa, new_size); |
| 427 | } |
| 428 | |
| 429 | try elf.got.plt.ensureUnusedCapacity(gpa, len); |
| 430 | const need_plt_capacity = elf.got.plt.count() + len; |
| 431 | |
| 432 | switch (elf.ehdrField(.machine)) { |
| 433 | else => |machine| @panic(@tagName(machine)), |
| 434 | .X86_64 => { |
| 435 | // Ensure the `.plt` section's node is big enough |
| 436 | const plt_need_size: usize = 16 * (1 + need_plt_capacity); |
| 437 | _, const plt_cur_size = elf.shndx.plt.get(elf).ni.location(&elf.mf).resolve(&elf.mf); |
| 438 | if (plt_cur_size < plt_need_size) { |
| 439 | const new_size = plt_need_size +| plt_need_size / MappedFile.growth_factor; |
| 440 | try elf.shndx.plt.get(elf).ni.resize(&elf.mf, gpa, new_size); |
| 441 | } |
| 442 | |
| 443 | // Ensure the `.got.plt` section's node is big enough |
| 444 | const got_plt_need_size: usize = switch (elf.identClass()) { |
| 445 | .NONE, _ => unreachable, |
| 446 | inline else => |class| @sizeOf(class.ElfN().Addr) * (3 + need_plt_capacity), |
| 447 | }; |
| 448 | _, const got_plt_cur_size = elf.shndx.got_plt.get(elf).ni.location(&elf.mf).resolve(&elf.mf); |
| 449 | if (got_plt_cur_size < got_plt_need_size) { |
| 450 | const new_size = got_plt_need_size +| got_plt_need_size / MappedFile.growth_factor; |
| 451 | try elf.shndx.got_plt.get(elf).ni.resize(&elf.mf, gpa, new_size); |
| 452 | } |
| 453 | |
| 454 | // Ensure the `.plt.sec` section's node is big enough |
| 455 | const plt_sec_need_size: usize = 16 * need_plt_capacity; |
| 456 | _, const plt_sec_cur_size = elf.shndx.plt_sec.get(elf).ni.location(&elf.mf).resolve(&elf.mf); |
| 457 | if (plt_sec_cur_size < plt_sec_need_size) { |
| 458 | const new_size = plt_sec_need_size +| plt_sec_need_size / MappedFile.growth_factor; |
| 459 | try elf.shndx.plt_sec.get(elf).ni.resize(&elf.mf, gpa, new_size); |
| 460 | } |
| 461 | |
| 462 | // Ensure the `.rela.plt` section's node is big enough |
| 463 | const rela_plt_shndx = elf.shndx.got_plt.get(elf).rela_shndx; |
| 464 | const rela_plt_need_size: usize = switch (elf.shdrPtr(rela_plt_shndx)) { |
| 465 | inline else => |shdr| @intCast(elf.targetLoad(&shdr.entsize) * need_plt_capacity), |
| 466 | }; |
| 467 | _, const rela_plt_cur_size = rela_plt_shndx.get(elf).ni.location(&elf.mf).resolve(&elf.mf); |
| 468 | if (rela_plt_cur_size < rela_plt_need_size) { |
| 469 | const new_size = rela_plt_need_size +| rela_plt_need_size / MappedFile.growth_factor; |
| 470 | try rela_plt_shndx.get(elf).ni.resize(&elf.mf, gpa, new_size); |
| 471 | } else { |
| 472 | // Still mark `.rela.plt` as resized so that the DT_PLTRELSZ entry can |
| 473 | // be updated if we do indeed add a PLT entry. |
| 474 | try rela_plt_shndx.get(elf).ni.resized(gpa, &elf.mf); |
| 475 | } |
| 476 | }, |
| 477 | } |
| 274 | 478 | } |
| 275 | | pub fn toSection(s: Shndx) ?std.elf.Section { |
| 276 | | return switch (@intFromEnum(s)) { |
| 277 | | std.elf.SHN_UNDEF...std.elf.SHN_LORESERVE - 1 => |sec| @intCast(sec), |
| 278 | | std.elf.SHN_LORESERVE...reserve(std.elf.SHN_LORESERVE) - 1 => null, |
| 279 | | reserve(std.elf.SHN_LORESERVE)...reserve(std.elf.SHN_HIRESERVE) => |sec| @intCast( |
| 280 | | sec - reserve(std.elf.SHN_LORESERVE) + std.elf.SHN_LORESERVE, |
| 281 | | ), |
| 282 | | }; |
| 479 | }, |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | const AddLocalSymbolOptions = struct { |
| 484 | node: MappedFile.Node.Index, |
| 485 | name: String(.strtab), |
| 486 | value: u64, |
| 487 | size: u64, |
| 488 | type: std.elf.STT, |
| 489 | shndx: Section.Index, |
| 490 | }; |
| 491 | fn addLocalSymbolAssumeCapacity(elf: *Elf, opts: AddLocalSymbolOptions) Symbol.LocalIndex { |
| 492 | switch (elf.shdrPtr(.symtab)) { |
| 493 | inline else => |shdr, class| { |
| 494 | const ent_size = @sizeOf(class.ElfN().Sym); |
| 495 | |
| 496 | // `shdr.info` stores the index of the first global symbol. We will replace it with our |
| 497 | // new local symbol, and move the global symbol to a new index at the end of the symtab. |
| 498 | const target_index: Symbol.Index = @enumFromInt(elf.targetLoad(&shdr.info)); |
| 499 | |
| 500 | const old_size = elf.targetLoad(&shdr.size); |
| 501 | const new_size = old_size + ent_size; |
| 502 | |
| 503 | assert(elf.symtab.items.len == @divExact(old_size, ent_size)); |
| 504 | |
| 505 | elf.targetStore(&shdr.info, @intFromEnum(target_index) + 1); |
| 506 | elf.targetStore(&shdr.size, new_size); |
| 507 | |
| 508 | const new_index: Symbol.Index = @enumFromInt(elf.symtab.items.len); |
| 509 | elf.symtab.appendAssumeCapacity(undefined); |
| 510 | |
| 511 | const target_sym = @field(elf.symPtr(target_index), @tagName(class)); |
| 512 | |
| 513 | if (target_index != new_index) { |
| 514 | // Move the global at `target_index` to `new_index`. First the symtab entry... |
| 515 | const new_sym = @field(elf.symPtr(new_index), @tagName(class)); |
| 516 | new_sym.* = target_sym.*; |
| 517 | // ...then the `elf.symtab` metadata... |
| 518 | new_index.ptr(elf).* = target_index.ptr(elf).*; |
| 519 | // ...then update the `elf.globals` tracking. |
| 520 | const global_name: String(.strtab) = @enumFromInt(elf.targetLoad(&new_sym.name)); |
| 521 | elf.globalByName(global_name).?.symtab_index = new_index; |
| 522 | |
| 523 | if (target_index.ptr(elf).first_target_reloc != .none) { |
| 524 | // This symbol's index is changing, so queue an update of relocs targeting it. |
| 525 | elf.changed_symtab_index.putAssumeCapacity(global_name, {}); |
| 526 | } |
| 283 | 527 | } |
| 284 | 528 | |
| 285 | | pub fn get(s: Shndx, elf: *Elf) *Section { |
| 286 | | return &elf.shdrs.items[@intFromEnum(s)]; |
| 529 | target_index.ptr(elf).* = .{ |
| 530 | .node = opts.node, |
| 531 | .first_target_reloc = .none, |
| 532 | }; |
| 533 | |
| 534 | target_sym.* = .{ |
| 535 | .name = @intFromEnum(opts.name), |
| 536 | .value = @intCast(opts.value), |
| 537 | .size = @intCast(opts.size), |
| 538 | .info = .{ .type = opts.type, .bind = .LOCAL }, |
| 539 | .other = .{ .visibility = .DEFAULT }, |
| 540 | .shndx = opts.shndx.toSection().?, |
| 541 | }; |
| 542 | if (elf.targetEndian() != native_endian) { |
| 543 | std.mem.byteSwapAllFields(class.ElfN().Sym, target_sym); |
| 287 | 544 | } |
| 288 | | }; |
| 289 | | pub fn shndx(si: Symbol.Index, elf: *Elf) Shndx { |
| 290 | | return .fromSection(switch (elf.symPtr(si)) { |
| 291 | | inline else => |sym| elf.targetLoad(&sym.shndx), |
| 292 | | }); |
| 293 | | } |
| 294 | 545 | |
| 295 | | pub const InitOptions = struct { |
| 296 | | name: []const u8 = "", |
| 297 | | lib_name: ?[]const u8 = null, |
| 298 | | value: u64 = 0, |
| 299 | | size: u64 = 0, |
| 300 | | type: std.elf.STT, |
| 301 | | bind: std.elf.STB = .LOCAL, |
| 302 | | visibility: std.elf.STV = .DEFAULT, |
| 303 | | shndx: Shndx = .UNDEF, |
| 304 | | }; |
| 305 | | pub fn init(si: Symbol.Index, elf: *Elf, opts: InitOptions) !void { |
| 306 | | const comp = elf.base.comp; |
| 307 | | const gpa = comp.gpa; |
| 308 | | const target_endian = elf.targetEndian(); |
| 309 | | const name_strtab_entry = try elf.string(.strtab, opts.name); |
| 310 | | switch (elf.shdrPtr(elf.si.symtab.shndx(elf))) { |
| 311 | | inline else => |shdr| { |
| 312 | | const old_size = elf.targetLoad(&shdr.size); |
| 313 | | const ent_size = elf.targetLoad(&shdr.entsize); |
| 314 | | const new_size = ent_size * elf.symtab.items.len; |
| 315 | | if (new_size > old_size) { |
| 316 | | elf.targetStore(&shdr.size, @intCast(new_size)); |
| 317 | | const symtab_ni = elf.si.symtab.node(elf); |
| 318 | | _, const node_size = symtab_ni.location(&elf.mf).resolve(&elf.mf); |
| 319 | | if (new_size > node_size) try symtab_ni.resize( |
| 320 | | &elf.mf, |
| 321 | | gpa, |
| 322 | | new_size +| new_size / MappedFile.growth_factor, |
| 323 | | ); |
| 324 | | } |
| 546 | return @enumFromInt(@intFromEnum(target_index)); |
| 547 | }, |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | const AddGlobalSymbolOptions = struct { |
| 552 | const Name = struct { |
| 553 | strtab: String(.strtab), |
| 554 | dynstr: String(.dynstr), |
| 555 | fn string(elf: *Elf, slice: []const u8) !Name { |
| 556 | return .{ |
| 557 | .strtab = try elf.string(.strtab, slice), |
| 558 | .dynstr = switch (elf.shndx.dynsym) { |
| 559 | .UNDEF => .empty, |
| 560 | else => try elf.string(.dynstr, slice), |
| 325 | 561 | }, |
| 562 | }; |
| 563 | } |
| 564 | }; |
| 565 | |
| 566 | node: MappedFile.Node.Index, |
| 567 | name: Name, |
| 568 | lib_name: ?[]const u8 = null, |
| 569 | value: u64, |
| 570 | size: u64, |
| 571 | type: std.elf.STT, |
| 572 | bind: enum { strong, weak }, |
| 573 | visibility: std.elf.STV, |
| 574 | shndx: Section.Index, |
| 575 | }; |
| 576 | fn addGlobalSymbolAssumeCapacity(elf: *Elf, opts: AddGlobalSymbolOptions) error{MultipleDefinitions}!Symbol.Id { |
| 577 | _ = opts.lib_name; // TODO |
| 578 | |
| 579 | if (elf.shndx.dynsym == .UNDEF) { |
| 580 | assert(opts.name.dynstr == .empty); |
| 581 | } else { |
| 582 | assert(std.mem.eql(u8, opts.name.dynstr.slice(elf), opts.name.strtab.slice(elf))); |
| 583 | } |
| 584 | |
| 585 | // We break from this `switch` only if this symbol name did not previously exist at all and so |
| 586 | // we have added a new entry to one of the maps in `elf.globals`. In that case we actually need |
| 587 | // a new symtab entry. |
| 588 | const new_global_ptr: *Symbol.Global = if (opts.shndx != .UNDEF) switch (opts.bind) { |
| 589 | .strong => new_global: { |
| 590 | const gop = elf.globals.strong_def.getOrPutAssumeCapacity(opts.name.strtab); |
| 591 | if (gop.found_existing) return error.MultipleDefinitions; |
| 592 | const old_kv = elf.globals.weak_def.fetchSwapRemove(opts.name.strtab) orelse |
| 593 | elf.globals.strong_undef.fetchSwapRemove(opts.name.strtab) orelse |
| 594 | elf.globals.weak_undef.fetchSwapRemove(opts.name.strtab) orelse { |
| 595 | // The symbol did not already exist, so we'll use the "new global" path. |
| 596 | break :new_global gop.value_ptr; |
| 597 | }; |
| 598 | gop.value_ptr.* = old_kv.value; |
| 599 | elf.setGlobalSymbolValue(opts.name.strtab, gop.value_ptr, .{ |
| 600 | .node = opts.node, |
| 601 | .value = opts.value, |
| 602 | .size = opts.size, |
| 603 | .type = opts.type, |
| 604 | .shndx = opts.shndx, |
| 605 | }); |
| 606 | elf.mergeGlobalSymbolVisibility(gop.value_ptr, opts.visibility, .strong); |
| 607 | return .global(opts.name.strtab); |
| 608 | }, |
| 609 | .weak => new_global: { |
| 610 | if (elf.globals.strong_def.getPtr(opts.name.strtab)) |global| { |
| 611 | // The existing definition holds, we just merge our visibility in. |
| 612 | elf.mergeGlobalSymbolVisibility(global, opts.visibility, .strong); |
| 613 | return .global(opts.name.strtab); |
| 326 | 614 | } |
| 327 | | switch (elf.symPtr(si)) { |
| 328 | | inline else => |sym, class| { |
| 615 | const gop = elf.globals.weak_def.getOrPutAssumeCapacity(opts.name.strtab); |
| 616 | if (gop.found_existing) { |
| 617 | // The existing definition holds, we just merge our visibility in. |
| 618 | elf.mergeGlobalSymbolVisibility(gop.value_ptr, opts.visibility, .weak); |
| 619 | return .global(opts.name.strtab); |
| 620 | } |
| 621 | const old_kv = elf.globals.strong_undef.fetchSwapRemove(opts.name.strtab) orelse |
| 622 | elf.globals.weak_undef.fetchSwapRemove(opts.name.strtab) orelse { |
| 623 | // The symbol did not already exist, so we'll use the "new global" path. |
| 624 | break :new_global gop.value_ptr; |
| 625 | }; |
| 626 | gop.value_ptr.* = old_kv.value; |
| 627 | elf.setGlobalSymbolValue(opts.name.strtab, gop.value_ptr, .{ |
| 628 | .node = opts.node, |
| 629 | .value = opts.value, |
| 630 | .size = opts.size, |
| 631 | .type = opts.type, |
| 632 | .shndx = opts.shndx, |
| 633 | }); |
| 634 | elf.mergeGlobalSymbolVisibility(gop.value_ptr, opts.visibility, .weak); |
| 635 | return .global(opts.name.strtab); |
| 636 | }, |
| 637 | } else switch (opts.bind) { |
| 638 | .strong => new_global: { |
| 639 | if (elf.globals.strong_def.getPtr(opts.name.strtab)) |global| { |
| 640 | // The existing definition holds, we just merge our visibility in. |
| 641 | elf.mergeGlobalSymbolVisibility(global, opts.visibility, .strong); |
| 642 | return .global(opts.name.strtab); |
| 643 | } |
| 644 | if (elf.globals.weak_def.getPtr(opts.name.strtab)) |global| { |
| 645 | // The existing definition holds, we just merge our visibility in. |
| 646 | elf.mergeGlobalSymbolVisibility(global, opts.visibility, .weak); |
| 647 | return .global(opts.name.strtab); |
| 648 | } |
| 649 | const gop = elf.globals.strong_undef.getOrPutAssumeCapacity(opts.name.strtab); |
| 650 | if (gop.found_existing) { |
| 651 | // The existing symbol is okay, we just merge our visibility in. |
| 652 | elf.mergeGlobalSymbolVisibility(gop.value_ptr, opts.visibility, .strong); |
| 653 | return .global(opts.name.strtab); |
| 654 | } |
| 655 | const old_kv = elf.globals.weak_undef.fetchSwapRemove(opts.name.strtab) orelse { |
| 656 | // The symbol did not already exist, so we'll use the "new global" path. |
| 657 | break :new_global gop.value_ptr; |
| 658 | }; |
| 659 | gop.value_ptr.* = old_kv.value; |
| 660 | elf.mergeGlobalSymbolVisibility(gop.value_ptr, opts.visibility, .strong); |
| 661 | return .global(opts.name.strtab); |
| 662 | }, |
| 663 | .weak => new_global: { |
| 664 | if (elf.globals.strong_def.getPtr(opts.name.strtab) orelse |
| 665 | elf.globals.strong_undef.getPtr(opts.name.strtab)) |global| |
| 666 | { |
| 667 | // The existing symbol is okay, we just merge our visibility in. |
| 668 | elf.mergeGlobalSymbolVisibility(global, opts.visibility, .strong); |
| 669 | return .global(opts.name.strtab); |
| 670 | } |
| 671 | if (elf.globals.weak_def.getPtr(opts.name.strtab)) |global| { |
| 672 | // The existing symbol is okay, we just merge our visibility in. |
| 673 | elf.mergeGlobalSymbolVisibility(global, opts.visibility, .weak); |
| 674 | return .global(opts.name.strtab); |
| 675 | } |
| 676 | const gop = elf.globals.weak_undef.getOrPutAssumeCapacity(opts.name.strtab); |
| 677 | if (gop.found_existing) { |
| 678 | // The existing symbol is okay, we just merge our visibility in. |
| 679 | elf.mergeGlobalSymbolVisibility(gop.value_ptr, opts.visibility, .weak); |
| 680 | return .global(opts.name.strtab); |
| 681 | } |
| 682 | break :new_global gop.value_ptr; |
| 683 | }, |
| 684 | }; |
| 685 | |
| 686 | const force_local_bind: bool = switch (opts.visibility) { |
| 687 | .HIDDEN, .INTERNAL => elf.ehdrField(.type) != .REL, |
| 688 | .PROTECTED, .DEFAULT => false, |
| 689 | }; |
| 690 | |
| 691 | const bind: std.elf.STB = if (force_local_bind) b: { |
| 692 | break :b .LOCAL; |
| 693 | } else switch (opts.bind) { |
| 694 | .strong => .GLOBAL, |
| 695 | .weak => .WEAK, |
| 696 | }; |
| 697 | |
| 698 | const sym_index: Symbol.Index = @enumFromInt(elf.symtab.items.len); |
| 699 | elf.symtab.appendAssumeCapacity(.{ |
| 700 | .node = opts.node, |
| 701 | .first_target_reloc = .none, |
| 702 | }); |
| 703 | switch (elf.shdrPtr(.symtab)) { |
| 704 | inline else => |shdr, class| { |
| 705 | const Sym = class.ElfN().Sym; |
| 706 | // Increase the symtab size... |
| 707 | const old_size = elf.targetLoad(&shdr.size); |
| 708 | assert(old_size == @intFromEnum(sym_index) * @sizeOf(Sym)); |
| 709 | elf.targetStore(&shdr.size, old_size + @sizeOf(Sym)); |
| 710 | // ...then populate the newly-valid symbol pointer |
| 711 | const sym = @field(elf.symPtr(sym_index), @tagName(class)); |
| 712 | sym.* = .{ |
| 713 | .name = @intFromEnum(opts.name.strtab), |
| 714 | .value = @intCast(opts.value), |
| 715 | .size = @intCast(opts.size), |
| 716 | .info = .{ .type = opts.type, .bind = bind }, |
| 717 | .other = .{ .visibility = opts.visibility }, |
| 718 | .shndx = opts.shndx.toSection().?, |
| 719 | }; |
| 720 | if (elf.targetEndian() != native_endian) { |
| 721 | std.mem.byteSwapAllFields(Sym, sym); |
| 722 | } |
| 723 | }, |
| 724 | } |
| 725 | |
| 726 | const old_head: String(.strtab) = old_head: { |
| 727 | if (opts.node == .none) break :old_head .empty; |
| 728 | const gop = elf.node_global_symbols.getOrPutAssumeCapacity(opts.node); |
| 729 | const old_head: String(.strtab) = if (gop.found_existing) gop.value_ptr.* else .empty; |
| 730 | gop.value_ptr.* = opts.name.strtab; |
| 731 | break :old_head old_head; |
| 732 | }; |
| 733 | |
| 734 | new_global_ptr.* = .{ |
| 735 | .symtab_index = sym_index, |
| 736 | .dynsym_index = dynsym_index: { |
| 737 | if (elf.shndx.dynsym == .UNDEF) break :dynsym_index 0; |
| 738 | if (force_local_bind) break :dynsym_index 0; |
| 739 | switch (elf.shdrPtr(elf.shndx.dynsym)) { |
| 740 | inline else => |shdr, class| { |
| 329 | 741 | const Sym = class.ElfN().Sym; |
| 742 | // Increase the dynamic symbol table size... |
| 743 | const old_size = elf.targetLoad(&shdr.size); |
| 744 | elf.targetStore(&shdr.size, old_size + @sizeOf(Sym)); |
| 745 | const dynsym_index: u32 = @intCast(@divExact(old_size, @sizeOf(Sym))); |
| 746 | // ...then populate the newly-valid symbol pointer |
| 747 | const sym = @field(elf.dynsymPtr(dynsym_index), @tagName(class)); |
| 330 | 748 | sym.* = .{ |
| 331 | | .name = name_strtab_entry, |
| 749 | .name = @intFromEnum(opts.name.dynstr), |
| 332 | 750 | .value = @intCast(opts.value), |
| 333 | 751 | .size = @intCast(opts.size), |
| 334 | | .info = .{ .type = opts.type, .bind = opts.bind }, |
| 752 | .info = .{ .type = opts.type, .bind = bind }, |
| 335 | 753 | .other = .{ .visibility = opts.visibility }, |
| 336 | 754 | .shndx = opts.shndx.toSection().?, |
| 337 | 755 | }; |
| 338 | | if (target_endian != native_endian) std.mem.byteSwapAllFields(Sym, sym); |
| 756 | if (elf.targetEndian() != native_endian) { |
| 757 | std.mem.byteSwapAllFields(Sym, sym); |
| 758 | } |
| 759 | break :dynsym_index dynsym_index; |
| 339 | 760 | }, |
| 340 | 761 | } |
| 341 | | switch (elf.shdrPtr(elf.si.symtab.shndx(elf))) { |
| 342 | | inline else => |shdr| elf.targetStore(&shdr.info, @max( |
| 343 | | elf.targetLoad(&shdr.info), |
| 344 | | @intFromEnum(si) + 1, |
| 345 | | )), |
| 346 | | } |
| 762 | }, |
| 763 | .prev_in_node = .empty, |
| 764 | .next_in_node = old_head, |
| 765 | }; |
| 347 | 766 | |
| 348 | | if (opts.bind == .LOCAL) return; |
| 349 | | no_entry: { |
| 350 | | if (std.mem.eql(u8, opts.name, entry: switch (elf.options.entry) { |
| 351 | | .default => switch (comp.config.output_mode) { |
| 352 | | .Exe => continue :entry .enabled, |
| 353 | | .Lib, .Obj => continue :entry .disabled, |
| 354 | | }, |
| 355 | | .disabled => break :no_entry, |
| 356 | | .enabled => "_start", |
| 357 | | .named => |named| named, |
| 358 | | })) { |
| 359 | | elf.si.entry = si; |
| 360 | | switch (elf.ehdrPtr()) { |
| 361 | | inline else => |ehdr| elf.targetStore(&ehdr.entry, @intCast(opts.value)), |
| 362 | | } |
| 363 | | } |
| 767 | if (old_head != .empty) { |
| 768 | const old_head_ptr = elf.globalByName(old_head).?; |
| 769 | assert(old_head_ptr.symtab_index.ptr(elf).node == opts.node); |
| 770 | assert(old_head_ptr.prev_in_node == .empty); |
| 771 | old_head_ptr.prev_in_node = opts.name.strtab; |
| 772 | } |
| 773 | |
| 774 | if (force_local_bind) { |
| 775 | elf.moveDemotedGlobal(new_global_ptr); |
| 776 | } |
| 777 | |
| 778 | if (new_global_ptr.dynsym_index != 0 and |
| 779 | opts.visibility == .DEFAULT and |
| 780 | opts.shndx == .UNDEF and |
| 781 | opts.type == .FUNC) |
| 782 | { |
| 783 | // We're adding an undefined global STT_FUNC symbol which could be resolved by another DSO. |
| 784 | // We therefore might need a PLT entry, so let's add one now. TODO: it'd be good to remove |
| 785 | // the PLT entry if we later discover a link inpu which resolves this reference. |
| 786 | elf.addPltEntry(opts.name.strtab, new_global_ptr.dynsym_index); |
| 787 | } |
| 788 | |
| 789 | return .global(opts.name.strtab); |
| 790 | } |
| 791 | fn setGlobalSymbolValue( |
| 792 | elf: *Elf, |
| 793 | global_name: String(.strtab), |
| 794 | global_ptr: *Symbol.Global, |
| 795 | new: struct { |
| 796 | node: MappedFile.Node.Index, |
| 797 | value: u64, |
| 798 | size: u64, |
| 799 | type: std.elf.STT, |
| 800 | shndx: Section.Index, |
| 801 | }, |
| 802 | ) void { |
| 803 | const old_node = global_ptr.symtab_index.ptr(elf).node; |
| 804 | if (old_node != .none) { |
| 805 | if (global_ptr.next_in_node != .empty) { |
| 806 | const next = elf.globalByName(global_ptr.next_in_node).?; |
| 807 | assert(next.prev_in_node == global_name); |
| 808 | assert(next.symtab_index.ptr(elf).node == old_node); |
| 809 | next.prev_in_node = global_ptr.prev_in_node; |
| 810 | } |
| 811 | if (global_ptr.prev_in_node != .empty) { |
| 812 | const prev = elf.globalByName(global_ptr.prev_in_node).?; |
| 813 | assert(prev.next_in_node == global_name); |
| 814 | assert(prev.symtab_index.ptr(elf).node == old_node); |
| 815 | prev.next_in_node = global_ptr.next_in_node; |
| 816 | } else { |
| 817 | // We're the start of the linked list, so we need to change the head. |
| 818 | if (global_ptr.next_in_node == .empty) { |
| 819 | assert(elf.node_global_symbols.fetchSwapRemove(old_node).?.value == global_name); |
| 820 | } else { |
| 821 | elf.node_global_symbols.getPtr(old_node).?.* = global_ptr.next_in_node; |
| 364 | 822 | } |
| 823 | } |
| 824 | } else { |
| 825 | assert(global_ptr.next_in_node == .empty); |
| 826 | assert(global_ptr.prev_in_node == .empty); |
| 827 | } |
| 365 | 828 | |
| 366 | | if (elf.si.dynsym == .null) return; |
| 367 | | const dsi = elf.dynsym.count(); |
| 368 | | try elf.dynsym.putNoClobber(gpa, si, {}); |
| 369 | | const name_dynstr_entry = try elf.string(.dynstr, opts.name); |
| 370 | | switch (elf.shdrPtr(elf.si.dynsym.shndx(elf))) { |
| 371 | | inline else => |shdr| { |
| 372 | | const old_size = elf.targetLoad(&shdr.size); |
| 373 | | const ent_size = elf.targetLoad(&shdr.entsize); |
| 374 | | const new_size = ent_size * elf.dynsym.count(); |
| 375 | | if (new_size > old_size) { |
| 376 | | elf.targetStore(&shdr.size, @intCast(new_size)); |
| 377 | | const dynsym_ni = elf.si.dynsym.node(elf); |
| 378 | | _, const node_size = dynsym_ni.location(&elf.mf).resolve(&elf.mf); |
| 379 | | if (new_size > node_size) try dynsym_ni.resize( |
| 380 | | &elf.mf, |
| 381 | | gpa, |
| 382 | | new_size +| new_size / MappedFile.growth_factor, |
| 383 | | ); |
| 384 | | } |
| 829 | global_ptr.symtab_index.ptr(elf).node = new.node; |
| 830 | |
| 831 | const old_head: String(.strtab) = old_head: { |
| 832 | if (new.node == .none) break :old_head .empty; |
| 833 | const gop = elf.node_global_symbols.getOrPutAssumeCapacity(new.node); |
| 834 | const old_head: String(.strtab) = if (gop.found_existing) gop.value_ptr.* else .empty; |
| 835 | gop.value_ptr.* = global_name; |
| 836 | break :old_head old_head; |
| 837 | }; |
| 838 | |
| 839 | global_ptr.prev_in_node = .empty; |
| 840 | global_ptr.next_in_node = old_head; |
| 841 | |
| 842 | if (old_head != .empty) { |
| 843 | const old_head_ptr = elf.globalByName(old_head).?; |
| 844 | assert(old_head_ptr.symtab_index.ptr(elf).node == new.node); |
| 845 | assert(old_head_ptr.prev_in_node == .empty); |
| 846 | old_head_ptr.prev_in_node = global_name; |
| 847 | } |
| 848 | |
| 849 | // Now for the easy bit where we actually update the symtab entry. |
| 850 | switch (elf.symPtr(global_ptr.symtab_index)) { |
| 851 | inline else => |sym| { |
| 852 | // Don't bother with `sym.value` here: it'll be updated by `flushMoved`. |
| 853 | elf.targetStore(&sym.size, @intCast(new.size)); |
| 854 | elf.targetStore(&sym.shndx, new.shndx.toSection().?); |
| 855 | const old_bind = elf.targetLoad(&sym.info).bind; |
| 856 | elf.targetStore(&sym.info, .{ |
| 857 | .type = new.type, |
| 858 | .bind = old_bind, |
| 859 | }); |
| 860 | }, |
| 861 | } |
| 862 | |
| 863 | // ...and also the dynsym entry if there is one. |
| 864 | if (global_ptr.dynsym_index != 0) switch (elf.dynsymPtr(global_ptr.dynsym_index)) { |
| 865 | inline else => |sym| { |
| 866 | // Don't bother with `sym.value` here: it'll be updated by `flushMoved`. |
| 867 | elf.targetStore(&sym.size, @intCast(new.size)); |
| 868 | elf.targetStore(&sym.shndx, new.shndx.toSection().?); |
| 869 | const old_bind = elf.targetLoad(&sym.info).bind; |
| 870 | elf.targetStore(&sym.info, .{ |
| 871 | .type = new.type, |
| 872 | .bind = old_bind, |
| 873 | }); |
| 874 | }, |
| 875 | }; |
| 876 | |
| 877 | global_ptr.flushMoved(elf, new.value); |
| 878 | } |
| 879 | /// When the same global symbol appears in two inputs---even if one symbol is defined and the other |
| 880 | /// undefined---their visibility values are combined to determine the resulting visibility, which |
| 881 | /// can also affect the bind of the symbol we output. |
| 882 | fn mergeGlobalSymbolVisibility(elf: *Elf, global_ptr: *Symbol.Global, other_visibility: std.elf.STV, bind: enum { strong, weak }) void { |
| 883 | const old_visibility: std.elf.STV = switch (elf.symPtr(global_ptr.symtab_index)) { |
| 884 | inline else => |sym| elf.targetLoad(&sym.other).visibility, |
| 885 | }; |
| 886 | // The combined visibility is essentially the "strictest" of the two, with most strict being |
| 887 | // INTERNAL, followed by HIDDEN, PROTECTED, DEFAULT. |
| 888 | const new_visibility: std.elf.STV, const newly_hidden: bool = switch (old_visibility) { |
| 889 | .INTERNAL => .{ .INTERNAL, false }, |
| 890 | .HIDDEN => switch (other_visibility) { |
| 891 | .INTERNAL => .{ .INTERNAL, false }, |
| 892 | .HIDDEN, .PROTECTED, .DEFAULT => .{ .HIDDEN, false }, |
| 893 | }, |
| 894 | .PROTECTED => switch (other_visibility) { |
| 895 | .INTERNAL => .{ .INTERNAL, true }, |
| 896 | .HIDDEN => .{ .HIDDEN, true }, |
| 897 | .PROTECTED, .DEFAULT => .{ .PROTECTED, false }, |
| 898 | }, |
| 899 | .DEFAULT => switch (other_visibility) { |
| 900 | .INTERNAL => .{ .INTERNAL, true }, |
| 901 | .HIDDEN => .{ .HIDDEN, true }, |
| 902 | .PROTECTED => .{ .PROTECTED, false }, |
| 903 | .DEFAULT => .{ .DEFAULT, false }, |
| 904 | }, |
| 905 | }; |
| 906 | // If the symbol is HIDDEN/INTERNAL and we're emitting an ELF module (executable or shared |
| 907 | // object), then the symbol should have binding STB_LOCAL in the output. Therefore, if we are |
| 908 | // putting the global in this state for the first time---let's call it "demoting" the global to |
| 909 | // STB_LOCAL---we need to update its bind in the symtab. |
| 910 | const demote_to_local = newly_hidden and elf.ehdrField(.type) != .REL; |
| 911 | switch (elf.symPtr(global_ptr.symtab_index)) { |
| 912 | inline else => |sym, class| { |
| 913 | const old_info = elf.targetLoad(&sym.info); |
| 914 | const new_info: class.ElfN().Sym.Info = .{ |
| 915 | .type = old_info.type, |
| 916 | .bind = if (demote_to_local) b: { |
| 917 | assert(old_info.bind != .LOCAL); |
| 918 | break :b .LOCAL; |
| 919 | } else if (old_info.bind == .LOCAL) .LOCAL else switch (bind) { |
| 920 | .strong => .GLOBAL, |
| 921 | .weak => .WEAK, |
| 385 | 922 | }, |
| 923 | }; |
| 924 | elf.targetStore(&sym.other, .{ .visibility = new_visibility }); |
| 925 | elf.targetStore(&sym.info, new_info); |
| 926 | // also update dynsym |
| 927 | if (global_ptr.dynsym_index != 0) { |
| 928 | const dynsym = @field(elf.dynsymPtr(global_ptr.dynsym_index), @tagName(class)); |
| 929 | elf.targetStore(&dynsym.other, .{ .visibility = new_visibility }); |
| 930 | elf.targetStore(&dynsym.info, new_info); |
| 386 | 931 | } |
| 387 | | switch (elf.dynsymSlice()) { |
| 388 | | inline else => |dynsyms, class| { |
| 389 | | const Sym = class.ElfN().Sym; |
| 390 | | const dynsym = &dynsyms[dsi]; |
| 391 | | dynsym.* = .{ |
| 392 | | .name = name_dynstr_entry, |
| 393 | | .value = @intCast(opts.value), |
| 394 | | .size = @intCast(opts.size), |
| 395 | | .info = .{ .type = opts.type, .bind = opts.bind }, |
| 396 | | .other = .{ .visibility = opts.visibility }, |
| 397 | | .shndx = opts.shndx.toSection().?, |
| 398 | | }; |
| 399 | | if (target_endian != native_endian) std.mem.byteSwapAllFields(Sym, dynsym); |
| 400 | | }, |
| 932 | }, |
| 933 | } |
| 934 | if (demote_to_local) { |
| 935 | // When demoting a global to STB_LOCAL, we need to move its symtab index so that it is with |
| 936 | // the STB_LOCAL symbols instead of the global symbols. |
| 937 | elf.moveDemotedGlobal(global_ptr); |
| 938 | } |
| 939 | } |
| 940 | /// If a symbol which was STB_GLOBAL/STB_WEAK becomes STB_LOCAL (see `mergeGlobalSymbolVisibility`), |
| 941 | /// the symbol must be moved from the "globals" part of the symtab to the "locals" part, because ELF |
| 942 | /// requires that all STB_LOCAL symbols in a symbol table appear before any global symbols. |
| 943 | fn moveDemotedGlobal(elf: *Elf, global_ptr: *Symbol.Global) void { |
| 944 | assert(elf.ehdrField(.type) != .REL); // demotion only happens when emitting an ELF module |
| 945 | switch (elf.shdrPtr(.symtab)) { |
| 946 | inline else => |shdr, class| { |
| 947 | // `shdr.info` stores the index of the first global symbol. We are going to swap the |
| 948 | // demoted symbol with that first global symbol, then increment that start index. |
| 949 | const dest_index: Symbol.Index = @enumFromInt(elf.targetLoad(&shdr.info)); |
| 950 | const src_index = global_ptr.symtab_index; |
| 951 | |
| 952 | // This global should currently be in the "global symbols" part of the symtab, since our |
| 953 | // job is to move it *out* of that part: |
| 954 | assert(@intFromEnum(src_index) >= @intFromEnum(dest_index)); |
| 955 | |
| 956 | elf.targetStore(&shdr.info, @intFromEnum(dest_index) + 1); |
| 957 | |
| 958 | if (src_index == dest_index) { |
| 959 | // The demoted global was already the first global, so we don't need to do any swap. |
| 960 | return; |
| 401 | 961 | } |
| 402 | 962 | |
| 403 | | if (opts.type != .FUNC or opts.shndx != .UNDEF) return; |
| 404 | | const plt_index: u32 = @intCast(elf.got.plt.count()); |
| 405 | | try elf.got.plt.putNoClobber(gpa, si, {}); |
| 406 | | switch (elf.ehdrField(.machine)) { |
| 407 | | else => |machine| @panic(@tagName(machine)), |
| 408 | | .X86_64 => { |
| 409 | | const plt_ni = elf.si.plt.node(elf); |
| 410 | | _, const plt_node_size = plt_ni.location(&elf.mf).resolve(&elf.mf); |
| 411 | | const plt_addr = plt_addr: switch (elf.shdrPtr(elf.si.plt.shndx(elf))) { |
| 412 | | inline else => |shdr| { |
| 413 | | const old_size = 16 * (1 + plt_index); |
| 414 | | const new_size = old_size + 16; |
| 415 | | elf.targetStore(&shdr.size, new_size); |
| 416 | | if (new_size > plt_node_size) try plt_ni.resize( |
| 417 | | &elf.mf, |
| 418 | | gpa, |
| 419 | | new_size +| new_size / MappedFile.growth_factor, |
| 420 | | ); |
| 421 | | const plt_slice = plt_ni.slice(&elf.mf)[old_size..new_size]; |
| 422 | | @memcpy(plt_slice, &[16]u8{ |
| 423 | | 0xf3, 0x0f, 0x1e, 0xfa, // endbr64 |
| 424 | | 0x68, 0x00, 0x00, 0x00, 0x00, // push $0x0 |
| 425 | | 0xe9, 0x00, 0x00, 0x00, 0x00, // jmp 0 |
| 426 | | 0x66, 0x90, // xchg %ax,%ax |
| 427 | | }); |
| 428 | | std.mem.writeInt(u32, plt_slice[5..][0..4], plt_index, target_endian); |
| 429 | | std.mem.writeInt( |
| 430 | | i32, |
| 431 | | plt_slice[10..][0..4], |
| 432 | | 2 - @as(i32, @intCast(new_size)), |
| 433 | | target_endian, |
| 434 | | ); |
| 435 | | break :plt_addr elf.targetLoad(&shdr.addr) + old_size; |
| 436 | | }, |
| 437 | | }; |
| 963 | const src_sym_ptr = @field(elf.symPtr(src_index), @tagName(class)); |
| 964 | const dest_sym_ptr = @field(elf.symPtr(dest_index), @tagName(class)); |
| 438 | 965 | |
| 439 | | const got_plt_shndx = elf.si.got_plt.shndx(elf); |
| 440 | | const got_plt_ni = elf.si.got_plt.node(elf); |
| 441 | | _, const got_plt_node_size = got_plt_ni.location(&elf.mf).resolve(&elf.mf); |
| 442 | | const got_plt_addr = got_plt_addr: switch (elf.shdrPtr(got_plt_shndx)) { |
| 443 | | inline else => |shdr, class| { |
| 444 | | const Addr = class.ElfN().Addr; |
| 445 | | const addr_size = @sizeOf(Addr); |
| 446 | | const old_size = addr_size * (3 + plt_index); |
| 447 | | const new_size = old_size + addr_size; |
| 448 | | elf.targetStore(&shdr.size, new_size); |
| 449 | | if (new_size > got_plt_node_size) try got_plt_ni.resize( |
| 450 | | &elf.mf, |
| 451 | | gpa, |
| 452 | | new_size +| new_size / MappedFile.growth_factor, |
| 453 | | ); |
| 454 | | std.mem.writeInt( |
| 455 | | Addr, |
| 456 | | got_plt_ni.slice(&elf.mf)[old_size..][0..addr_size], |
| 457 | | @intCast(plt_addr), |
| 458 | | target_endian, |
| 459 | | ); |
| 460 | | break :got_plt_addr elf.targetLoad(&shdr.addr) + old_size; |
| 461 | | }, |
| 462 | | }; |
| 966 | const this_name: String(.strtab) = @enumFromInt(elf.targetLoad(&src_sym_ptr.name)); |
| 967 | assert(elf.globalByName(this_name).? == global_ptr); |
| 968 | if (global_ptr.symtab_index.ptr(elf).first_target_reloc != .none) { |
| 969 | // This symbol's index is changing, so queue an update of relocs targeting it. |
| 970 | elf.changed_symtab_index.putAssumeCapacity(this_name, {}); |
| 971 | } |
| 972 | |
| 973 | const other_name: String(.strtab) = @enumFromInt(elf.targetLoad(&dest_sym_ptr.name)); |
| 974 | const other_global_ptr = elf.globalByName(other_name).?; |
| 975 | assert(other_global_ptr.symtab_index == dest_index); |
| 976 | if (other_global_ptr.symtab_index.ptr(elf).first_target_reloc != .none) { |
| 977 | // This other symbol's index is changing, so queue an update of relocs targeting it. |
| 978 | elf.changed_symtab_index.putAssumeCapacity(other_name, {}); |
| 979 | } |
| 980 | |
| 981 | // First swap the symtab entries... |
| 982 | std.mem.swap(class.ElfN().Sym, src_sym_ptr, dest_sym_ptr); |
| 983 | // ...then the `elf.symtab` metadata... |
| 984 | std.mem.swap(Symbol, src_index.ptr(elf), dest_index.ptr(elf)); |
| 985 | // ...then update the `elf.globals` tracking. |
| 986 | global_ptr.symtab_index = dest_index; |
| 987 | other_global_ptr.symtab_index = src_index; |
| 988 | |
| 989 | // We also need to get rid of the dynsym entry if there is one. For simplicity, just |
| 990 | // replace it with a dummy entry which will never be used and will not cause problems. |
| 991 | // TODO: we should have a free-list of dynsym slots so that other symbols can go here. |
| 992 | // TODO: it would also be best to just avoid having gaps in the dynsym altogether. |
| 993 | if (global_ptr.dynsym_index != 0) { |
| 994 | const dynsym = @field(elf.dynsymPtr(global_ptr.dynsym_index), @tagName(class)); |
| 995 | dynsym.* = .{ |
| 996 | .name = @intFromEnum(String(.dynstr).empty), |
| 997 | .value = 0, |
| 998 | .size = 0, |
| 999 | .info = .{ |
| 1000 | .type = .NOTYPE, |
| 1001 | // STB_WEAK is important: we mustn't cause a dynamic linker error if the |
| 1002 | // symbol can't be resolved. |
| 1003 | .bind = .WEAK, |
| 1004 | }, |
| 1005 | // SHN_UNDEF is important: we mustn't define this symbol for other DSOs. |
| 1006 | .shndx = std.elf.SHN_UNDEF, |
| 1007 | .other = .{ .visibility = .DEFAULT }, |
| 1008 | }; |
| 1009 | if (elf.targetEndian() != native_endian) { |
| 1010 | std.mem.byteSwapAllFields(class.ElfN().Sym, dynsym); |
| 1011 | } |
| 1012 | } |
| 1013 | }, |
| 1014 | } |
| 1015 | } |
| 1016 | fn addPltEntry(elf: *Elf, global_name: String(.strtab), dynsym_index: u32) void { |
| 1017 | const target_endian = elf.targetEndian(); |
| 1018 | const plt_index: u32 = @intCast(elf.got.plt.count()); |
| 1019 | elf.got.plt.putAssumeCapacityNoClobber(.global(global_name), {}); |
| 1020 | switch (elf.ehdrField(.machine)) { |
| 1021 | else => |machine| @panic(@tagName(machine)), |
| 1022 | .X86_64 => { |
| 1023 | const plt_ni = elf.shndx.plt.get(elf).ni; |
| 1024 | const plt_addr = plt_addr: switch (elf.shdrPtr(elf.shndx.plt)) { |
| 1025 | inline else => |shdr| { |
| 1026 | const old_size = 16 * (1 + plt_index); |
| 1027 | assert(elf.targetLoad(&shdr.size) == old_size); |
| 1028 | elf.targetStore(&shdr.size, old_size + 16); |
| 1029 | const plt_slice = plt_ni.slice(&elf.mf)[old_size..][0..16]; |
| 1030 | @memcpy(plt_slice, &[16]u8{ |
| 1031 | 0xf3, 0x0f, 0x1e, 0xfa, // endbr64 |
| 1032 | 0x68, 0x00, 0x00, 0x00, 0x00, // push $0x0 |
| 1033 | 0xe9, 0x00, 0x00, 0x00, 0x00, // jmp 0 |
| 1034 | 0x66, 0x90, // xchg %ax,%ax |
| 1035 | }); |
| 1036 | std.mem.writeInt(u32, plt_slice[5..][0..4], plt_index, target_endian); |
| 1037 | std.mem.writeInt( |
| 1038 | i32, |
| 1039 | plt_slice[10..][0..4], |
| 1040 | -@as(i32, @intCast(old_size + 14)), |
| 1041 | target_endian, |
| 1042 | ); |
| 1043 | break :plt_addr elf.targetLoad(&shdr.addr) + old_size; |
| 1044 | }, |
| 1045 | }; |
| 1046 | |
| 1047 | const got_plt_shndx = elf.shndx.got_plt; |
| 1048 | const got_plt_ni = elf.shndx.got_plt.get(elf).ni; |
| 1049 | const got_plt_addr = got_plt_addr: switch (elf.shdrPtr(got_plt_shndx)) { |
| 1050 | inline else => |shdr, class| { |
| 1051 | const ent_size = @sizeOf(class.ElfN().Addr); |
| 1052 | const old_size = ent_size * (3 + plt_index); |
| 1053 | elf.targetStore(&shdr.size, old_size + ent_size); |
| 1054 | std.mem.writeInt( |
| 1055 | class.ElfN().Addr, |
| 1056 | got_plt_ni.slice(&elf.mf)[old_size..][0..ent_size], |
| 1057 | @intCast(plt_addr), |
| 1058 | target_endian, |
| 1059 | ); |
| 1060 | break :got_plt_addr elf.targetLoad(&shdr.addr) + old_size; |
| 1061 | }, |
| 1062 | }; |
| 463 | 1063 | |
| 464 | | const plt_sec_ni = elf.si.plt_sec.node(elf); |
| 465 | | _, const plt_sec_node_size = plt_sec_ni.location(&elf.mf).resolve(&elf.mf); |
| 466 | | switch (elf.shdrPtr(elf.si.plt_sec.shndx(elf))) { |
| 467 | | inline else => |shdr| { |
| 468 | | const old_size = 16 * plt_index; |
| 469 | | const new_size = old_size + 16; |
| 470 | | elf.targetStore(&shdr.size, new_size); |
| 471 | | if (new_size > plt_sec_node_size) try plt_sec_ni.resize( |
| 472 | | &elf.mf, |
| 473 | | gpa, |
| 474 | | new_size +| new_size / MappedFile.growth_factor, |
| 475 | | ); |
| 476 | | const plt_sec_slice = plt_sec_ni.slice(&elf.mf)[old_size..new_size]; |
| 477 | | @memcpy(plt_sec_slice, &[16]u8{ |
| 478 | | 0xf3, 0x0f, 0x1e, 0xfa, // endbr64 |
| 479 | | 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, // jmp *0x0(%rip) |
| 480 | | 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00, // nopw 0x0(%rax,%rax,1) |
| 481 | | }); |
| 482 | | std.mem.writeInt( |
| 483 | | i32, |
| 484 | | plt_sec_slice[6..][0..4], |
| 485 | | @intCast(@as(i64, @bitCast( |
| 486 | | got_plt_addr -% (elf.targetLoad(&shdr.addr) + old_size + 10), |
| 487 | | ))), |
| 488 | | target_endian, |
| 489 | | ); |
| 490 | | }, |
| 491 | | } |
| 1064 | const plt_sec_ni = elf.shndx.plt_sec.get(elf).ni; |
| 1065 | switch (elf.shdrPtr(elf.shndx.plt_sec)) { |
| 1066 | inline else => |shdr| { |
| 1067 | const old_size = 16 * plt_index; |
| 1068 | elf.targetStore(&shdr.size, old_size + 16); |
| 1069 | const plt_sec_slice = plt_sec_ni.slice(&elf.mf)[old_size..][0..16]; |
| 1070 | @memcpy(plt_sec_slice, &[16]u8{ |
| 1071 | 0xf3, 0x0f, 0x1e, 0xfa, // endbr64 |
| 1072 | 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, // jmp *0x0(%rip) |
| 1073 | 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00, // nopw 0x0(%rax,%rax,1) |
| 1074 | }); |
| 1075 | std.mem.writeInt( |
| 1076 | i32, |
| 1077 | plt_sec_slice[6..][0..4], |
| 1078 | @intCast(@as(i64, @bitCast( |
| 1079 | got_plt_addr -% (elf.targetLoad(&shdr.addr) + old_size + 10), |
| 1080 | ))), |
| 1081 | target_endian, |
| 1082 | ); |
| 1083 | }, |
| 1084 | } |
| 492 | 1085 | |
| 493 | | const rela_plt_si = got_plt_shndx.get(elf).rela_si; |
| 494 | | const rela_plt_ni = rela_plt_si.node(elf); |
| 495 | | _, const rela_plt_node_size = rela_plt_ni.location(&elf.mf).resolve(&elf.mf); |
| 496 | | switch (elf.shdrPtr(rela_plt_si.shndx(elf))) { |
| 497 | | inline else => |shdr, class| { |
| 498 | | const Rela = class.ElfN().Rela; |
| 499 | | const rela_size = elf.targetLoad(&shdr.entsize); |
| 500 | | const old_size = rela_size * plt_index; |
| 501 | | const new_size = old_size + rela_size; |
| 502 | | elf.targetStore(&shdr.size, new_size); |
| 503 | | if (new_size > rela_plt_node_size) try rela_plt_ni.resize( |
| 504 | | &elf.mf, |
| 505 | | gpa, |
| 506 | | new_size +| new_size / MappedFile.growth_factor, |
| 507 | | ); |
| 508 | | const rela: *Rela = @ptrCast(@alignCast( |
| 509 | | rela_plt_ni.slice(&elf.mf)[@intCast(old_size)..@intCast(new_size)], |
| 510 | | )); |
| 511 | | rela.* = .{ |
| 512 | | .offset = @intCast(got_plt_addr), |
| 513 | | .info = .{ |
| 514 | | .type = @intFromEnum(std.elf.R_X86_64.JUMP_SLOT), |
| 515 | | .sym = @intCast(dsi), |
| 516 | | }, |
| 517 | | .addend = 0, |
| 518 | | }; |
| 519 | | if (target_endian != native_endian) std.mem.byteSwapAllFields(Rela, rela); |
| 1086 | const rela_plt_shndx = got_plt_shndx.get(elf).rela_shndx; |
| 1087 | const rela_plt_ni = rela_plt_shndx.get(elf).ni; |
| 1088 | switch (elf.shdrPtr(rela_plt_shndx)) { |
| 1089 | inline else => |shdr, class| { |
| 1090 | const Rela = class.ElfN().Rela; |
| 1091 | const rela_size = elf.targetLoad(&shdr.entsize); |
| 1092 | const old_size = rela_size * plt_index; |
| 1093 | const new_size = old_size + rela_size; |
| 1094 | elf.targetStore(&shdr.size, new_size); |
| 1095 | const rela: *Rela = @ptrCast(@alignCast( |
| 1096 | rela_plt_ni.slice(&elf.mf)[@intCast(old_size)..@intCast(new_size)], |
| 1097 | )); |
| 1098 | rela.* = .{ |
| 1099 | .offset = @intCast(got_plt_addr), |
| 1100 | .info = .{ |
| 1101 | .type = @intFromEnum(std.elf.R_X86_64.JUMP_SLOT), |
| 1102 | .sym = @intCast(dynsym_index), |
| 520 | 1103 | }, |
| 521 | | } |
| 522 | | try rela_plt_ni.resized(gpa, &elf.mf); |
| 1104 | .addend = 0, |
| 1105 | }; |
| 1106 | if (target_endian != native_endian) std.mem.byteSwapAllFields(Rela, rela); |
| 523 | 1107 | }, |
| 524 | 1108 | } |
| 525 | | } |
| 1109 | }, |
| 1110 | } |
| 1111 | } |
| 526 | 1112 | |
| 527 | | pub fn flushMoved(si: Symbol.Index, elf: *Elf, value: u64) void { |
| 528 | | switch (elf.symPtr(si)) { |
| 529 | | inline else => |sym, class| { |
| 530 | | elf.targetStore(&sym.value, @intCast(value)); |
| 531 | | if (si == elf.si.entry) { |
| 532 | | @branchHint(.unlikely); |
| 533 | | @field(elf.ehdrPtr(), @tagName(class)).entry = sym.value; |
| 534 | | } |
| 535 | | }, |
| 1113 | const Symbol = struct { |
| 1114 | /// The node which this symbol's value is defined relative to. Possible values are: |
| 1115 | /// * `.none` for a SHN_ABS or SHN_UNDEF symbol |
| 1116 | /// * A section (the symbol's value is that section's vaddr) |
| 1117 | /// * An input section (the symbol's value is some vaddr in that input section) |
| 1118 | /// * A NAV, UAV, or lazy code/data (the symbol's value is exactly the vaddr of that node) |
| 1119 | node: MappedFile.Node.Index, |
| 1120 | |
| 1121 | /// The head of a linked list of relocations targeting this symbol. |
| 1122 | first_target_reloc: Reloc.Index, |
| 1123 | |
| 1124 | const Global = struct { |
| 1125 | /// The current index of the symtab entry for this global symbol. |
| 1126 | symtab_index: Symbol.Index, |
| 1127 | /// The current index of the dynsym entry for this global symbol. If the global has been |
| 1128 | /// demoted to STB_LOCAL, it does not have a dynsym entry and this field is set to 0. |
| 1129 | dynsym_index: u32, |
| 1130 | |
| 1131 | /// The next entry in a linked list of global symbols with the same `Symbol.node` value. |
| 1132 | /// |
| 1133 | /// If `node` is `.none`, this is `.empty`. |
| 1134 | next_in_node: String(.strtab), |
| 1135 | /// The previous entry in a linked list of global symbols with the same `Symbol.node` value. |
| 1136 | /// |
| 1137 | /// If `node` is `.none`, this is `.empty`. |
| 1138 | prev_in_node: String(.strtab), |
| 1139 | |
| 1140 | /// Like `Symbol.Index.flushMoved`, but also updates the dynamic symbol table if necessary. |
| 1141 | fn flushMoved(g: *const Global, elf: *Elf, value: u64) void { |
| 1142 | g.symtab_index.flushMoved(elf, value); |
| 1143 | if (g.dynsym_index != 0) { |
| 1144 | switch (elf.dynsymPtr(g.dynsym_index)) { |
| 1145 | inline else => |sym| elf.targetStore(&sym.value, @intCast(value)), |
| 1146 | } |
| 536 | 1147 | } |
| 537 | | si.applyLocationRelocs(elf); |
| 538 | | si.applyTargetRelocs(elf); |
| 539 | 1148 | } |
| 1149 | }; |
| 1150 | |
| 1151 | /// An index directly into the symtab. These values are not stable (global symbols are sometimes |
| 1152 | /// moved to new locations in the symtab) and therefore should only be used ephemerally. |
| 1153 | /// |
| 1154 | /// Local symbols *do* have stable indices into the symtab; see `LocalIndex`. |
| 1155 | /// |
| 1156 | /// For a stable reference to an arbitrary symbol, see `Id`. |
| 1157 | const Index = enum(u32) { |
| 1158 | null = 0, |
| 1159 | _, |
| 540 | 1160 | |
| 541 | | pub fn applyLocationRelocs(si: Symbol.Index, elf: *Elf) void { |
| 542 | | if (elf.ehdrField(.type) == .REL) return; |
| 543 | | switch (si.get(elf).loc_relocs) { |
| 544 | | .none => {}, |
| 545 | | else => |loc_relocs| for (elf.relocs.items[@intFromEnum(loc_relocs)..]) |*reloc| { |
| 546 | | if (reloc.loc != si) break; |
| 1161 | fn flushMoved(si: Symbol.Index, elf: *Elf, value: u64) void { |
| 1162 | switch (elf.symPtr(si)) { |
| 1163 | inline else => |sym| elf.targetStore(&sym.value, @intCast(value)), |
| 1164 | } |
| 1165 | if (elf.ehdrField(.type) != .REL) { |
| 1166 | var ri = si.ptr(elf).first_target_reloc; |
| 1167 | while (ri != .none) { |
| 1168 | const reloc = ri.get(elf); |
| 1169 | assert(reloc.target.index(elf) == si); |
| 547 | 1170 | reloc.apply(elf); |
| 548 | | }, |
| 1171 | ri = reloc.next; |
| 1172 | } |
| 549 | 1173 | } |
| 550 | 1174 | } |
| 1175 | fn ptr(si: Symbol.Index, elf: *Elf) *Symbol { |
| 1176 | return &elf.symtab.items[@intFromEnum(si)]; |
| 1177 | } |
| 1178 | }; |
| 551 | 1179 | |
| 552 | | pub fn applyTargetRelocs(si: Symbol.Index, elf: *Elf) void { |
| 553 | | if (elf.ehdrField(.type) == .REL) return; |
| 554 | | var ri = si.get(elf).target_relocs; |
| 555 | | while (ri != .none) { |
| 556 | | const reloc = ri.get(elf); |
| 557 | | assert(reloc.target == si); |
| 558 | | reloc.apply(elf); |
| 559 | | ri = reloc.next; |
| 560 | | } |
| 1180 | /// A `LocalIndex` is a raw index into the symtab like `Index`, but it guarantees that the |
| 1181 | /// symbol in question has STB_LOCAL binding, which guarantees that its symtab index is stable |
| 1182 | /// so can be stored long-term without needing to be updated |
| 1183 | /// |
| 1184 | /// This is because symbols which have STB_LOCAL binding in the output file gain fixed symtab |
| 1185 | /// indices, thanks to a combination of a few factors: |
| 1186 | /// * We never remove STB_LOCAL symbols |
| 1187 | /// * There is no symbol ordering requirement *within* the leading range of STB_LOCAL symbols |
| 1188 | /// * A symbol visibility which demotes a global to STB_LOCAL binding can never be reverted by |
| 1189 | /// a subsequent operation (different visibilities resolve to the "strictest" one) |
| 1190 | const LocalIndex = enum(u32) { |
| 1191 | null = 0, |
| 1192 | _, |
| 1193 | |
| 1194 | fn index(li: LocalIndex) Index { |
| 1195 | return @enumFromInt(@intFromEnum(li)); |
| 561 | 1196 | } |
| 1197 | }; |
| 562 | 1198 | |
| 563 | | pub fn deleteLocationRelocs(si: Symbol.Index, elf: *Elf) void { |
| 564 | | const sym = si.get(elf); |
| 565 | | for (elf.relocs.items[@intFromEnum(sym.loc_relocs)..]) |*reloc| { |
| 566 | | if (reloc.loc != si) break; |
| 567 | | reloc.delete(elf); |
| 568 | | } |
| 569 | | sym.loc_relocs = .none; |
| 1199 | /// Opaque, stable identifier for a symbol. Does not necessarily equal the index into the symtab. |
| 1200 | const Id = packed struct(u32) { |
| 1201 | kind: enum(u1) { local, global }, |
| 1202 | raw: u31, |
| 1203 | |
| 1204 | const @"null": Symbol.Id = .local(.null); |
| 1205 | |
| 1206 | fn local(lsi: Symbol.LocalIndex) Symbol.Id { |
| 1207 | return .{ .kind = .local, .raw = @intCast(@intFromEnum(lsi)) }; |
| 1208 | } |
| 1209 | fn global(name: String(.strtab)) Symbol.Id { |
| 1210 | return .{ .kind = .global, .raw = @intCast(@intFromEnum(name)) }; |
| 1211 | } |
| 1212 | fn unwrap(s: Symbol.Id) union(enum) { |
| 1213 | local: Symbol.LocalIndex, |
| 1214 | global: String(.strtab), |
| 1215 | } { |
| 1216 | return switch (s.kind) { |
| 1217 | .local => .{ .local = @enumFromInt(s.raw) }, |
| 1218 | .global => .{ .global = @enumFromInt(s.raw) }, |
| 1219 | }; |
| 1220 | } |
| 1221 | |
| 1222 | fn toTypeErased(s: Symbol.Id) link.File.SymbolId { |
| 1223 | return @enumFromInt(@as(u32, @bitCast(s))); |
| 1224 | } |
| 1225 | fn fromTypeErased(s: link.File.SymbolId) Symbol.Id { |
| 1226 | return @bitCast(@intFromEnum(s)); |
| 1227 | } |
| 1228 | |
| 1229 | fn index(s: Symbol.Id, elf: *const Elf) Symbol.Index { |
| 1230 | return switch (s.unwrap()) { |
| 1231 | .local => |lsi| lsi.index(), |
| 1232 | .global => |name| elf.globalByName(name).?.symtab_index, |
| 1233 | }; |
| 1234 | } |
| 1235 | |
| 1236 | fn value(s: Symbol.Id, elf: *Elf) u64 { |
| 1237 | return switch (elf.symPtr(s.index(elf))) { |
| 1238 | inline else => |sym| elf.targetLoad(&sym.value), |
| 1239 | }; |
| 1240 | } |
| 1241 | |
| 1242 | /// Returns `true` if the target of `s` has moved, meaning the symbol's value will change at |
| 1243 | /// some point due to a call to `flushMoved`. |
| 1244 | fn hasMoved(s: Symbol.Id, elf: *Elf) bool { |
| 1245 | const node = s.index(elf).ptr(elf).node; |
| 1246 | if (node == .none) return false; |
| 1247 | return node.hasMoved(&elf.mf); |
| 570 | 1248 | } |
| 571 | 1249 | }; |
| 1250 | }; |
| 572 | 1251 | |
| 573 | | pub const Known = struct { |
| 574 | | comptime symtab: Symbol.Index = .symtab, |
| 575 | | comptime shstrtab: Symbol.Index = .shstrtab, |
| 576 | | comptime strtab: Symbol.Index = .strtab, |
| 577 | | comptime rodata: Symbol.Index = .rodata, |
| 578 | | comptime text: Symbol.Index = .text, |
| 579 | | comptime data: Symbol.Index = .data, |
| 580 | | comptime data_rel_ro: Symbol.Index = .data_rel_ro, |
| 581 | | comptime got: Symbol.Index = .got, |
| 582 | | comptime got_plt: Symbol.Index = .got_plt, |
| 583 | | comptime plt: Symbol.Index = .plt, |
| 584 | | comptime plt_sec: Symbol.Index = .plt_sec, |
| 585 | | dynsym: Symbol.Index, |
| 586 | | dynstr: Symbol.Index, |
| 587 | | dynamic: Symbol.Index, |
| 588 | | tdata: Symbol.Index, |
| 589 | | entry: Symbol.Index, |
| 1252 | fn globalByName(elf: *const Elf, name: String(.strtab)) ?*Symbol.Global { |
| 1253 | if (elf.globals.strong_def.getPtr(name)) |ptr| return ptr; |
| 1254 | if (elf.globals.weak_def.getPtr(name)) |ptr| return ptr; |
| 1255 | if (elf.globals.strong_undef.getPtr(name)) |ptr| return ptr; |
| 1256 | if (elf.globals.weak_undef.getPtr(name)) |ptr| return ptr; |
| 1257 | return null; |
| 1258 | } |
| 1259 | |
| 1260 | pub fn symbolForAtom(elf: *Elf, atom: link.File.AtomId) link.File.SymbolId { |
| 1261 | const lsi: Symbol.LocalIndex = switch (elf.getNode(Node.fromAtom(atom))) { |
| 1262 | .file, |
| 1263 | .ehdr, |
| 1264 | .shdr, |
| 1265 | .segment, |
| 1266 | .section, |
| 1267 | .input_section, |
| 1268 | => unreachable, |
| 1269 | |
| 1270 | inline .nav, |
| 1271 | .uav, |
| 1272 | .lazy_code, |
| 1273 | .lazy_const_data, |
| 1274 | => |i| i.symbol(elf), |
| 590 | 1275 | }; |
| 1276 | const s: Symbol.Id = .local(lsi); |
| 1277 | return s.toTypeErased(); |
| 1278 | } |
| 1279 | pub fn lazySymbol(elf: *Elf, lazy: link.File.LazySymbol) !link.File.SymbolId { |
| 1280 | const gpa = elf.base.comp.gpa; |
| 591 | 1281 | |
| 592 | | comptime { |
| 593 | | if (!std.debug.runtime_safety) std.debug.assert(@sizeOf(Symbol) == 16); |
| 1282 | try elf.ensureUnusedSymbolCapacity(1, .all_local); |
| 1283 | try elf.nodes.ensureUnusedCapacity(gpa, 1); |
| 1284 | try elf.lazy.getPtr(lazy.kind).map.ensureUnusedCapacity(gpa, 1); |
| 1285 | |
| 1286 | const gop = elf.lazy.getPtr(lazy.kind).map.getOrPutAssumeCapacity(lazy.ty); |
| 1287 | if (!gop.found_existing) { |
| 1288 | const shndx: Section.Index, const sym_type: std.elf.STT = switch (lazy.kind) { |
| 1289 | .code => .{ .text, .FUNC }, |
| 1290 | .const_data => .{ .rodata, .OBJECT }, |
| 1291 | }; |
| 1292 | const node = try elf.mf.addLastChildNode(gpa, shndx.get(elf).ni, .{}); |
| 1293 | var name_buf: [64]u8 = undefined; |
| 1294 | const name = std.fmt.bufPrint( |
| 1295 | &name_buf, |
| 1296 | "__lazy_{t}_{d}", |
| 1297 | .{ lazy.kind, @intFromEnum(lazy.ty) }, |
| 1298 | ) catch unreachable; |
| 1299 | gop.value_ptr.* = .{ |
| 1300 | .lsi = elf.addLocalSymbolAssumeCapacity(.{ |
| 1301 | .node = node, |
| 1302 | .name = try elf.string(.strtab, name), |
| 1303 | .value = 0, |
| 1304 | .size = 0, |
| 1305 | .type = sym_type, |
| 1306 | .shndx = shndx, |
| 1307 | }), |
| 1308 | .first_reloc = .none, |
| 1309 | }; |
| 1310 | elf.nodes.appendAssumeCapacity(switch (lazy.kind) { |
| 1311 | .code => .{ .lazy_code = @enumFromInt(gop.index) }, |
| 1312 | .const_data => .{ .lazy_const_data = @enumFromInt(gop.index) }, |
| 1313 | }); |
| 1314 | elf.synth_prog_node.increaseEstimatedTotalItems(1); |
| 1315 | } |
| 1316 | const s: Symbol.Id = .local(gop.value_ptr.lsi); |
| 1317 | return s.toTypeErased(); |
| 1318 | } |
| 1319 | pub fn externSymbol(elf: *Elf, opts: struct { |
| 1320 | name: []const u8, |
| 1321 | lib_name: ?[]const u8, |
| 1322 | type: std.elf.STT, |
| 1323 | linkage: std.lang.GlobalLinkage = .strong, |
| 1324 | visibility: std.lang.SymbolVisibility = .default, |
| 1325 | }) !link.File.SymbolId { |
| 1326 | try elf.ensureUnusedSymbolCapacity(1, .maybe_global); |
| 1327 | const symbol = elf.addGlobalSymbolAssumeCapacity(.{ |
| 1328 | .node = .none, |
| 1329 | .name = try .string(elf, opts.name), |
| 1330 | .lib_name = opts.lib_name, |
| 1331 | .value = 0, |
| 1332 | .size = 0, |
| 1333 | .type = opts.type, |
| 1334 | .bind = switch (opts.linkage) { |
| 1335 | .internal => @panic("TODO internal extern symbol"), |
| 1336 | .strong => .strong, |
| 1337 | .weak => .weak, |
| 1338 | .link_once => return error.LinkOnceUnsupported, |
| 1339 | }, |
| 1340 | .visibility = switch (opts.visibility) { |
| 1341 | .default => .DEFAULT, |
| 1342 | .hidden => .HIDDEN, |
| 1343 | .protected => .PROTECTED, |
| 1344 | }, |
| 1345 | .shndx = .UNDEF, |
| 1346 | }) catch |err| switch (err) { |
| 1347 | error.MultipleDefinitions => unreachable, // shndx is undef |
| 1348 | }; |
| 1349 | return symbol.toTypeErased(); |
| 1350 | } |
| 1351 | pub fn addReloc( |
| 1352 | elf: *Elf, |
| 1353 | atom: link.File.AtomId, |
| 1354 | offset: u64, |
| 1355 | target: link.File.SymbolId, |
| 1356 | addend: i64, |
| 1357 | @"type": Reloc.Type, |
| 1358 | ) !void { |
| 1359 | const node: MappedFile.Node.Index = Node.fromAtom(atom); |
| 1360 | try elf.ensureUnusedRelocCapacity(node, 1); |
| 1361 | elf.addRelocAssumeCapacity(node, offset, .fromTypeErased(target), addend, @"type"); |
| 1362 | } |
| 1363 | pub fn navSymbol(elf: *Elf, nav_index: InternPool.Nav.Index) !link.File.SymbolId { |
| 1364 | const zcu = elf.base.comp.zcu.?; |
| 1365 | const ip = &zcu.intern_pool; |
| 1366 | const nav = ip.getNav(nav_index); |
| 1367 | if (nav.getExtern(ip)) |@"extern"| { |
| 1368 | return elf.externSymbol(.{ |
| 1369 | .name = @"extern".name.toSlice(ip), |
| 1370 | .lib_name = @"extern".lib_name.toSlice(ip), |
| 1371 | .type = navType(ip, nav.resolved.?, elf.base.comp.config.any_non_single_threaded), |
| 1372 | .linkage = @"extern".linkage, |
| 1373 | .visibility = @"extern".visibility, |
| 1374 | }); |
| 1375 | } |
| 1376 | const nmi = try elf.navMapIndex(zcu, nav_index); |
| 1377 | const s: Symbol.Id = .local(nmi.symbol(elf)); |
| 1378 | return s.toTypeErased(); |
| 1379 | } |
| 1380 | pub fn uavSymbol( |
| 1381 | elf: *Elf, |
| 1382 | uav_val: InternPool.Index, |
| 1383 | uav_align: InternPool.Alignment, |
| 1384 | ) !link.File.SymbolId { |
| 1385 | const umi = try elf.uavMapIndex(uav_val, uav_align); |
| 1386 | const s: Symbol.Id = .local(umi.symbol(elf)); |
| 1387 | return s.toTypeErased(); |
| 1388 | } |
| 1389 | pub fn getNavVAddr( |
| 1390 | elf: *Elf, |
| 1391 | pt: Zcu.PerThread, |
| 1392 | nav: InternPool.Nav.Index, |
| 1393 | reloc_info: link.File.RelocInfo, |
| 1394 | ) !u64 { |
| 1395 | _ = pt; |
| 1396 | return elf.getVAddr(reloc_info, try elf.navSymbol(nav)); |
| 1397 | } |
| 1398 | pub fn getUavVAddr( |
| 1399 | elf: *Elf, |
| 1400 | uav_val: InternPool.Index, |
| 1401 | reloc_info: link.File.RelocInfo, |
| 1402 | ) !u64 { |
| 1403 | return elf.getVAddr(reloc_info, try elf.uavSymbol(uav_val, .none)); |
| 1404 | } |
| 1405 | pub fn getVAddr(elf: *Elf, reloc_info: link.File.RelocInfo, target: link.File.SymbolId) !u64 { |
| 1406 | const node: MappedFile.Node.Index = Node.fromAtom(reloc_info.parent.atom_index); |
| 1407 | const target_sym: Symbol.Id = .fromTypeErased(target); |
| 1408 | try elf.ensureUnusedRelocCapacity(node, 1); |
| 1409 | elf.addRelocAssumeCapacity( |
| 1410 | node, |
| 1411 | reloc_info.offset, |
| 1412 | target_sym, |
| 1413 | reloc_info.addend, |
| 1414 | .absAddr(elf), |
| 1415 | ); |
| 1416 | return target_sym.value(elf); |
| 1417 | } |
| 1418 | pub fn lowerUav( |
| 1419 | elf: *Elf, |
| 1420 | pt: Zcu.PerThread, |
| 1421 | uav_val: InternPool.Index, |
| 1422 | uav_align: InternPool.Alignment, |
| 1423 | src_loc: Zcu.LazySrcLoc, |
| 1424 | ) !codegen.SymbolResult { |
| 1425 | _ = pt; |
| 1426 | const umi = elf.uavMapIndex(uav_val, uav_align) catch |err| switch (err) { |
| 1427 | error.OutOfMemory => |e| return e, |
| 1428 | else => |e| return .{ .fail = try Zcu.ErrorMsg.create( |
| 1429 | elf.base.comp.gpa, |
| 1430 | src_loc, |
| 1431 | "linker failed to update constant: {s}", |
| 1432 | .{@errorName(e)}, |
| 1433 | ) }, |
| 1434 | }; |
| 1435 | const s: Symbol.Id = .local(umi.symbol(elf)); |
| 1436 | return .{ .sym_index = s.toTypeErased() }; |
| 1437 | } |
| 1438 | |
| 1439 | const StringSection = enum { |
| 1440 | shstrtab, |
| 1441 | strtab, |
| 1442 | dynstr, |
| 1443 | fn shndx(s: StringSection, elf: *const Elf) Section.Index { |
| 1444 | return switch (s) { |
| 1445 | .strtab => .strtab, |
| 1446 | .shstrtab => .shstrtab, |
| 1447 | .dynstr => elf.shndx.dynstr, |
| 1448 | }; |
| 594 | 1449 | } |
| 595 | 1450 | }; |
| 1451 | fn String(section: StringSection) type { |
| 1452 | return enum(u32) { |
| 1453 | empty = 0, |
| 1454 | _, |
| 1455 | |
| 1456 | fn slice(str: @This(), elf: *Elf) [:0]const u8 { |
| 1457 | const section_node = section.shndx(elf).get(elf).ni; |
| 1458 | const overlong = section_node.sliceConst(&elf.mf)[@intFromEnum(str)..]; |
| 1459 | return overlong[0..std.mem.findScalar(u8, overlong, 0).? :0]; |
| 1460 | } |
| 1461 | }; |
| 1462 | } |
| 1463 | fn string(elf: *Elf, comptime section: StringSection, key: []const u8) !String(section) { |
| 1464 | const st: *StringTable = &@field(elf, @tagName(section)); |
| 1465 | return @enumFromInt(try st.get(elf, section.shndx(elf), key)); |
| 1466 | } |
| 596 | 1467 | |
| 597 | | pub const StringTable = struct { |
| 1468 | const StringTable = struct { |
| 598 | 1469 | map: std.HashMapUnmanaged(u32, void, StringTable.Context, std.hash_map.default_max_load_percentage), |
| 599 | 1470 | |
| 600 | 1471 | const Context = struct { |
| ... | ... | @@ -623,9 +1494,13 @@ pub const StringTable = struct { |
| 623 | 1494 | } |
| 624 | 1495 | }; |
| 625 | 1496 | |
| 626 | | pub fn get(st: *StringTable, elf: *Elf, si: Symbol.Index, key: []const u8) !u32 { |
| 1497 | pub fn get(st: *StringTable, elf: *Elf, shndx: Section.Index, key: []const u8) !u32 { |
| 1498 | // If we are in `initHeaders` the strtab might not be initalized yet, so we need to special |
| 1499 | // case the empty string. |
| 1500 | if (key.len == 0) return 0; |
| 1501 | |
| 627 | 1502 | const gpa = elf.base.comp.gpa; |
| 628 | | const ni = si.node(elf); |
| 1503 | const ni = shndx.get(elf).ni; |
| 629 | 1504 | const slice_const = ni.sliceConst(&elf.mf); |
| 630 | 1505 | const gop = try st.map.getOrPutContextAdapted( |
| 631 | 1506 | gpa, |
| ... | ... | @@ -635,7 +1510,7 @@ pub const StringTable = struct { |
| 635 | 1510 | ); |
| 636 | 1511 | if (gop.found_existing) return gop.key_ptr.*; |
| 637 | 1512 | try ni.resized(gpa, &elf.mf); |
| 638 | | const old_size, const new_size = size: switch (elf.shdrPtr(si.shndx(elf))) { |
| 1513 | const old_size, const new_size = size: switch (elf.shdrPtr(shndx)) { |
| 639 | 1514 | inline else => |shdr| { |
| 640 | 1515 | const old_size: u32 = @intCast(elf.targetLoad(&shdr.size)); |
| 641 | 1516 | const new_size: u32 = @intCast(old_size + key.len + 1); |
| ... | ... | @@ -654,7 +1529,7 @@ pub const StringTable = struct { |
| 654 | 1529 | } |
| 655 | 1530 | }; |
| 656 | 1531 | |
| 657 | | pub const GotIndex = enum(u32) { |
| 1532 | const GotIndex = enum(u32) { |
| 658 | 1533 | none = std.math.maxInt(u32), |
| 659 | 1534 | _, |
| 660 | 1535 | |
| ... | ... | @@ -671,12 +1546,12 @@ pub const GotIndex = enum(u32) { |
| 671 | 1546 | } |
| 672 | 1547 | }; |
| 673 | 1548 | |
| 674 | | pub const Reloc = extern struct { |
| 1549 | const Reloc = extern struct { |
| 675 | 1550 | type: Reloc.Type, |
| 676 | 1551 | prev: Reloc.Index, |
| 677 | 1552 | next: Reloc.Index, |
| 678 | | loc: Symbol.Index, |
| 679 | | target: Symbol.Index, |
| 1553 | node: MappedFile.Node.Index, |
| 1554 | target: Symbol.Id, |
| 680 | 1555 | index: Section.RelIndex, |
| 681 | 1556 | offset: u64, |
| 682 | 1557 | addend: i64, |
| ... | ... | @@ -745,85 +1620,86 @@ pub const Reloc = extern struct { |
| 745 | 1620 | |
| 746 | 1621 | pub fn apply(reloc: *const Reloc, elf: *Elf) void { |
| 747 | 1622 | assert(elf.ehdrField(.type) != .REL); |
| 748 | | const loc_ni = reloc.loc.get(elf).ni; |
| 749 | | switch (loc_ni) { |
| 750 | | .none => return, |
| 751 | | else => |ni| if (ni.hasMoved(&elf.mf)) return, |
| 752 | | } |
| 753 | | switch (reloc.target.get(elf).ni) { |
| 754 | | .none => {}, |
| 755 | | else => |ni| if (ni.hasMoved(&elf.mf)) return, |
| 1623 | assert(reloc.node != .none); |
| 1624 | if (reloc.node.hasMoved(&elf.mf) or reloc.target.hasMoved(elf)) { |
| 1625 | // There's no point applying the relocation now, because it will be re-applied by |
| 1626 | // `flushMoved` at some point anyway. |
| 1627 | return; |
| 756 | 1628 | } |
| 757 | | const loc_slice = loc_ni.slice(&elf.mf)[@intCast(reloc.offset)..]; |
| 1629 | const node_vaddr: u64 = switch (elf.getNode(reloc.node)) { |
| 1630 | .file => unreachable, |
| 1631 | .ehdr => unreachable, |
| 1632 | .shdr => unreachable, |
| 1633 | .segment => unreachable, |
| 1634 | .section => |shndx| shndx.vaddr(elf), |
| 1635 | .input_section => |isi| isi.ptrConst(elf).vaddr, |
| 1636 | inline .nav, |
| 1637 | .uav, |
| 1638 | .lazy_code, |
| 1639 | .lazy_const_data, |
| 1640 | => |i| Symbol.Id.local(i.symbol(elf)).value(elf), |
| 1641 | }; |
| 1642 | const dest_vaddr = node_vaddr + reloc.offset; |
| 1643 | const dest_slice = reloc.node.slice(&elf.mf)[@intCast(reloc.offset)..]; |
| 758 | 1644 | const target_endian = elf.targetEndian(); |
| 759 | | switch (elf.symtabSlice()) { |
| 760 | | inline else => |symtab, class| { |
| 761 | | const loc_sym = &symtab[@intFromEnum(reloc.loc)]; |
| 762 | | const loc_shndx = elf.targetLoad(&loc_sym.shndx); |
| 763 | | assert(loc_shndx != std.elf.SHN_UNDEF); |
| 764 | | const target_sym = &symtab[@intFromEnum(reloc.target)]; |
| 765 | | const target_value = |
| 766 | | elf.targetLoad(&target_sym.value) +% @as(u64, @bitCast(reloc.addend)); |
| 1645 | switch (elf.symPtr(reloc.target.index(elf))) { |
| 1646 | inline else => |target_sym, class| { |
| 1647 | const target_value = elf.targetLoad(&target_sym.value) +% @as(u64, @bitCast(reloc.addend)); |
| 767 | 1648 | switch (elf.ehdrField(.machine)) { |
| 768 | 1649 | else => |machine| @panic(@tagName(machine)), |
| 769 | 1650 | .X86_64 => switch (reloc.type.X86_64) { |
| 770 | 1651 | else => |kind| @panic(@tagName(kind)), |
| 771 | 1652 | .@"64" => std.mem.writeInt( |
| 772 | 1653 | u64, |
| 773 | | loc_slice[0..8], |
| 1654 | dest_slice[0..8], |
| 774 | 1655 | target_value, |
| 775 | 1656 | target_endian, |
| 776 | 1657 | ), |
| 777 | 1658 | .PC32 => std.mem.writeInt( |
| 778 | 1659 | i32, |
| 779 | | loc_slice[0..4], |
| 780 | | @intCast(@as(i64, @bitCast(target_value -% |
| 781 | | (elf.targetLoad(&loc_sym.value) + reloc.offset)))), |
| 1660 | dest_slice[0..4], |
| 1661 | @intCast(@as(i64, @bitCast(target_value -% dest_vaddr))), |
| 782 | 1662 | target_endian, |
| 783 | 1663 | ), |
| 784 | 1664 | .PLT32 => std.mem.writeInt( |
| 785 | 1665 | i32, |
| 786 | | loc_slice[0..4], |
| 787 | | @intCast(@as(i64, @bitCast( |
| 788 | | if (elf.got.plt.getIndex(reloc.target)) |plt_index| |
| 789 | | elf.targetLoad(&@field( |
| 790 | | elf.shdrPtr(elf.si.plt_sec.shndx(elf)), |
| 791 | | @tagName(class), |
| 792 | | ).addr) +% 16 * plt_index +% |
| 793 | | @as(u64, @bitCast(reloc.addend)) -% |
| 794 | | (elf.targetLoad(&loc_sym.value) + reloc.offset) |
| 795 | | else |
| 796 | | target_value -% |
| 797 | | (elf.targetLoad(&loc_sym.value) + reloc.offset), |
| 798 | | ))), |
| 1666 | dest_slice[0..4], |
| 1667 | @intCast(@as(i64, @bitCast(if (elf.got.plt.getIndex(reloc.target)) |plt_index| |
| 1668 | elf.targetLoad(&@field( |
| 1669 | elf.shdrPtr(elf.shndx.plt_sec), |
| 1670 | @tagName(class), |
| 1671 | ).addr) +% 16 * plt_index +% |
| 1672 | @as(u64, @bitCast(reloc.addend)) -% dest_vaddr |
| 1673 | else |
| 1674 | target_value -% dest_vaddr))), |
| 799 | 1675 | target_endian, |
| 800 | 1676 | ), |
| 801 | 1677 | .@"32" => std.mem.writeInt( |
| 802 | 1678 | u32, |
| 803 | | loc_slice[0..4], |
| 1679 | dest_slice[0..4], |
| 804 | 1680 | @intCast(target_value), |
| 805 | 1681 | target_endian, |
| 806 | 1682 | ), |
| 807 | 1683 | .@"32S" => std.mem.writeInt( |
| 808 | 1684 | i32, |
| 809 | | loc_slice[0..4], |
| 1685 | dest_slice[0..4], |
| 810 | 1686 | @intCast(@as(i64, @bitCast(target_value))), |
| 811 | 1687 | target_endian, |
| 812 | 1688 | ), |
| 813 | 1689 | .TLSLD => std.mem.writeInt( |
| 814 | 1690 | i32, |
| 815 | | loc_slice[0..4], |
| 1691 | dest_slice[0..4], |
| 816 | 1692 | @intCast(@as(i64, @bitCast( |
| 817 | | elf.targetLoad(&symtab[@intFromEnum(elf.si.got)].value) +% |
| 1693 | elf.shndx.got.vaddr(elf) +% |
| 818 | 1694 | @as(u64, @bitCast(reloc.addend)) +% |
| 819 | 1695 | @as(u64, 8) * elf.got.tlsld.unwrap().? -% |
| 820 | | (elf.targetLoad(&loc_sym.value) + reloc.offset), |
| 1696 | dest_vaddr, |
| 821 | 1697 | ))), |
| 822 | 1698 | target_endian, |
| 823 | 1699 | ), |
| 824 | 1700 | .DTPOFF32 => std.mem.writeInt( |
| 825 | 1701 | i32, |
| 826 | | loc_slice[0..4], |
| 1702 | dest_slice[0..4], |
| 827 | 1703 | @intCast(@as(i64, @bitCast(target_value))), |
| 828 | 1704 | target_endian, |
| 829 | 1705 | ), |
| ... | ... | @@ -833,14 +1709,14 @@ pub const Reloc = extern struct { |
| 833 | 1709 | assert(elf.targetLoad(&ph.type) == .TLS); |
| 834 | 1710 | std.mem.writeInt( |
| 835 | 1711 | i32, |
| 836 | | loc_slice[0..4], |
| 1712 | dest_slice[0..4], |
| 837 | 1713 | @intCast(@as(i64, @bitCast(target_value -% elf.targetLoad(&ph.memsz)))), |
| 838 | 1714 | target_endian, |
| 839 | 1715 | ); |
| 840 | 1716 | }, |
| 841 | 1717 | .SIZE32 => std.mem.writeInt( |
| 842 | 1718 | u32, |
| 843 | | loc_slice[0..4], |
| 1719 | dest_slice[0..4], |
| 844 | 1720 | @intCast( |
| 845 | 1721 | elf.targetLoad(&target_sym.size) +% @as(u64, @bitCast(reloc.addend)), |
| 846 | 1722 | ), |
| ... | ... | @@ -848,7 +1724,7 @@ pub const Reloc = extern struct { |
| 848 | 1724 | ), |
| 849 | 1725 | .SIZE64 => std.mem.writeInt( |
| 850 | 1726 | u64, |
| 851 | | loc_slice[0..8], |
| 1727 | dest_slice[0..8], |
| 852 | 1728 | elf.targetLoad(&target_sym.size) +% @as(u64, @bitCast(reloc.addend)), |
| 853 | 1729 | target_endian, |
| 854 | 1730 | ), |
| ... | ... | @@ -861,9 +1737,9 @@ pub const Reloc = extern struct { |
| 861 | 1737 | pub fn delete(reloc: *Reloc, elf: *Elf) void { |
| 862 | 1738 | switch (reloc.prev) { |
| 863 | 1739 | .none => { |
| 864 | | const target = reloc.target.get(elf); |
| 865 | | assert(target.target_relocs.get(elf) == reloc); |
| 866 | | target.target_relocs = reloc.next; |
| 1740 | const target_ptr = reloc.target.index(elf).ptr(elf); |
| 1741 | assert(target_ptr.first_target_reloc.get(elf) == reloc); |
| 1742 | target_ptr.first_target_reloc = reloc.next; |
| 867 | 1743 | }, |
| 868 | 1744 | else => |prev| prev.get(elf).next = reloc.next, |
| 869 | 1745 | } |
| ... | ... | @@ -874,13 +1750,13 @@ pub const Reloc = extern struct { |
| 874 | 1750 | switch (elf.ehdrField(.type)) { |
| 875 | 1751 | .NONE, .CORE, _ => unreachable, |
| 876 | 1752 | .REL => { |
| 877 | | const sh = reloc.loc.shndx(elf).get(elf); |
| 878 | | switch (elf.shdrPtr(sh.rela_si.shndx(elf))) { |
| 1753 | const sh = elf.getNodeShndx(reloc.node).get(elf); |
| 1754 | switch (elf.shdrPtr(sh.rela_shndx)) { |
| 879 | 1755 | inline else => |shdr, class| { |
| 880 | 1756 | const Rela = class.ElfN().Rela; |
| 881 | 1757 | const ent_size = elf.targetLoad(&shdr.entsize); |
| 882 | 1758 | const start = ent_size * reloc.index.unwrap().?; |
| 883 | | const rela_slice = sh.rela_si.node(elf).slice(&elf.mf); |
| 1759 | const rela_slice = sh.rela_shndx.get(elf).ni.slice(&elf.mf); |
| 884 | 1760 | const rela: *Rela = @ptrCast(@alignCast( |
| 885 | 1761 | rela_slice[@intCast(start)..][0..@intCast(ent_size)], |
| 886 | 1762 | )); |
| ... | ... | @@ -901,6 +1777,38 @@ pub const Reloc = extern struct { |
| 901 | 1777 | reloc.* = undefined; |
| 902 | 1778 | } |
| 903 | 1779 | |
| 1780 | fn updateTargetIndex(reloc: *const Reloc, elf: *Elf) void { |
| 1781 | assert(elf.ehdrField(.type) == .REL); |
| 1782 | const sh = elf.getNodeShndx(reloc.node).get(elf); |
| 1783 | switch (elf.shdrPtr(sh.rela_shndx)) { |
| 1784 | inline else => |shdr, class| { |
| 1785 | assert(elf.targetLoad(&shdr.entsize) == @sizeOf(class.ElfN().Rela)); |
| 1786 | const size = elf.targetLoad(&shdr.size); |
| 1787 | const raw_rela_slice = sh.rela_shndx.get(elf).ni.slice(&elf.mf); |
| 1788 | const rela_slice: []class.ElfN().Rela = @ptrCast(@alignCast(raw_rela_slice[0..@intCast(size)])); |
| 1789 | elf.targetStore(&rela_slice[reloc.index.unwrap().?].info, .{ |
| 1790 | .type = @intCast(reloc.type.unwrap(elf)), |
| 1791 | .sym = @intCast(@intFromEnum(reloc.target.index(elf))), |
| 1792 | }); |
| 1793 | }, |
| 1794 | } |
| 1795 | } |
| 1796 | |
| 1797 | fn updateNodeOffset(reloc: *const Reloc, elf: *Elf, node_offset: u64) void { |
| 1798 | assert(elf.ehdrField(.type) == .REL); |
| 1799 | const total_offset = node_offset + reloc.offset; |
| 1800 | const sh = elf.getNodeShndx(reloc.node).get(elf); |
| 1801 | switch (elf.shdrPtr(sh.rela_shndx)) { |
| 1802 | inline else => |shdr, class| { |
| 1803 | assert(elf.targetLoad(&shdr.entsize) == @sizeOf(class.ElfN().Rela)); |
| 1804 | const size = elf.targetLoad(&shdr.size); |
| 1805 | const raw_rela_slice = sh.rela_shndx.get(elf).ni.slice(&elf.mf); |
| 1806 | const rela_slice: []class.ElfN().Rela = @ptrCast(@alignCast(raw_rela_slice[0..@intCast(size)])); |
| 1807 | elf.targetStore(&rela_slice[reloc.index.unwrap().?].offset, @intCast(total_offset)); |
| 1808 | }, |
| 1809 | } |
| 1810 | } |
| 1811 | |
| 904 | 1812 | comptime { |
| 905 | 1813 | if (!std.debug.runtime_safety) std.debug.assert(@sizeOf(Reloc) == 40); |
| 906 | 1814 | } |
| ... | ... | @@ -1001,34 +1909,38 @@ fn create( |
| 1001 | 1909 | .nodes = .empty, |
| 1002 | 1910 | .shdrs = .empty, |
| 1003 | 1911 | .phdrs = .empty, |
| 1004 | | .si = .{ |
| 1005 | | .dynsym = .null, |
| 1006 | | .dynstr = .null, |
| 1007 | | .dynamic = .null, |
| 1008 | | .tdata = .null, |
| 1009 | | .entry = .null, |
| 1912 | .shndx = .{ |
| 1913 | .got = .UNDEF, |
| 1914 | .got_plt = .UNDEF, |
| 1915 | .plt = .UNDEF, |
| 1916 | .plt_sec = .UNDEF, |
| 1917 | .dynsym = .UNDEF, |
| 1918 | .dynstr = .UNDEF, |
| 1919 | .dynamic = .UNDEF, |
| 1920 | .tdata = .UNDEF, |
| 1010 | 1921 | }, |
| 1011 | 1922 | .symtab = .empty, |
| 1012 | | .shstrtab = .{ |
| 1013 | | .map = .empty, |
| 1014 | | }, |
| 1015 | | .strtab = .{ |
| 1016 | | .map = .empty, |
| 1017 | | }, |
| 1018 | | .dynsym = .empty, |
| 1019 | | .dynstr = .{ |
| 1020 | | .map = .empty, |
| 1923 | .globals = .{ |
| 1924 | .strong_def = .empty, |
| 1925 | .weak_def = .empty, |
| 1926 | .strong_undef = .empty, |
| 1927 | .weak_undef = .empty, |
| 1021 | 1928 | }, |
| 1929 | .node_global_symbols = .empty, |
| 1930 | .shstrtab = .{ .map = .empty }, |
| 1931 | .strtab = .{ .map = .empty }, |
| 1932 | .dynstr = .{ .map = .empty }, |
| 1022 | 1933 | .got = .{ |
| 1023 | 1934 | .len = 0, |
| 1024 | 1935 | .tlsld = .none, |
| 1025 | 1936 | .plt = .empty, |
| 1026 | 1937 | }, |
| 1938 | .first_plt_reloc = .none, |
| 1939 | .first_dynamic_reloc = .none, |
| 1027 | 1940 | .needed = .empty, |
| 1028 | 1941 | .inputs = .empty, |
| 1029 | 1942 | .input_sections = .empty, |
| 1030 | 1943 | .input_section_pending_index = 0, |
| 1031 | | .globals = .empty, |
| 1032 | 1944 | .navs = .empty, |
| 1033 | 1945 | .uavs = .empty, |
| 1034 | 1946 | .lazy = comptime .initFill(.{ |
| ... | ... | @@ -1037,6 +1949,7 @@ fn create( |
| 1037 | 1949 | }), |
| 1038 | 1950 | .pending_uavs = .empty, |
| 1039 | 1951 | .relocs = .empty, |
| 1952 | .changed_symtab_index = .empty, |
| 1040 | 1953 | .const_prog_node = .none, |
| 1041 | 1954 | .synth_prog_node = .none, |
| 1042 | 1955 | .input_prog_node = .none, |
| ... | ... | @@ -1054,21 +1967,25 @@ pub fn deinit(elf: *Elf) void { |
| 1054 | 1967 | elf.shdrs.deinit(gpa); |
| 1055 | 1968 | elf.phdrs.deinit(gpa); |
| 1056 | 1969 | elf.symtab.deinit(gpa); |
| 1970 | elf.globals.strong_def.deinit(gpa); |
| 1971 | elf.globals.weak_def.deinit(gpa); |
| 1972 | elf.globals.strong_undef.deinit(gpa); |
| 1973 | elf.globals.weak_undef.deinit(gpa); |
| 1974 | elf.node_global_symbols.deinit(gpa); |
| 1057 | 1975 | elf.shstrtab.map.deinit(gpa); |
| 1058 | 1976 | elf.strtab.map.deinit(gpa); |
| 1059 | | elf.dynsym.deinit(gpa); |
| 1060 | 1977 | elf.dynstr.map.deinit(gpa); |
| 1061 | 1978 | elf.got.plt.deinit(gpa); |
| 1062 | 1979 | elf.needed.deinit(gpa); |
| 1063 | 1980 | for (elf.inputs.items) |input| if (input.member) |m| gpa.free(m); |
| 1064 | 1981 | elf.inputs.deinit(gpa); |
| 1065 | 1982 | elf.input_sections.deinit(gpa); |
| 1066 | | elf.globals.deinit(gpa); |
| 1067 | 1983 | elf.navs.deinit(gpa); |
| 1068 | 1984 | elf.uavs.deinit(gpa); |
| 1069 | 1985 | for (&elf.lazy.values) |*lazy| lazy.map.deinit(gpa); |
| 1070 | 1986 | elf.pending_uavs.deinit(gpa); |
| 1071 | 1987 | elf.relocs.deinit(gpa); |
| 1988 | elf.changed_symtab_index.deinit(gpa); |
| 1072 | 1989 | elf.* = undefined; |
| 1073 | 1990 | } |
| 1074 | 1991 | |
| ... | ... | @@ -1123,19 +2040,18 @@ fn initHeaders( |
| 1123 | 2040 | const expected_nodes_len = expected_nodes_len: switch (@"type") { |
| 1124 | 2041 | .NONE, .CORE, _ => unreachable, |
| 1125 | 2042 | .REL => { |
| 2043 | // Each phdr is actually going to be an shdr. |
| 1126 | 2044 | defer phnum = 0; |
| 1127 | 2045 | break :expected_nodes_len 5 + phnum; |
| 1128 | 2046 | }, |
| 1129 | | .EXEC, .DYN => break :expected_nodes_len 8 + phnum * 2 + |
| 1130 | | @intFromBool(maybe_interp != null) + |
| 1131 | | @as(usize, 4) * @intFromBool(have_dynamic_section) + |
| 1132 | | @intFromBool(comp.config.any_non_single_threaded), |
| 2047 | .EXEC, .DYN => break :expected_nodes_len 10 + |
| 2048 | phnum * 2 - 1 + // each phdr also has a matching shdr, except for the PT_PHDR phdr |
| 2049 | @as(usize, 4) * @intFromBool(have_dynamic_section), // .dynstr, .dynsym, .rela.dyn, .rela.plt |
| 1133 | 2050 | }; |
| 1134 | 2051 | try elf.nodes.ensureTotalCapacity(gpa, expected_nodes_len); |
| 1135 | 2052 | try elf.shdrs.ensureTotalCapacity(gpa, shnum); |
| 1136 | 2053 | try elf.phdrs.resize(gpa, phnum); |
| 1137 | 2054 | try elf.symtab.ensureTotalCapacity(gpa, 1); |
| 1138 | | if (have_dynamic_section) try elf.dynsym.ensureTotalCapacity(gpa, 1); |
| 1139 | 2055 | elf.nodes.appendAssumeCapacity(.file); |
| 1140 | 2056 | |
| 1141 | 2057 | switch (class) { |
| ... | ... | @@ -1150,14 +2066,13 @@ fn initHeaders( |
| 1150 | 2066 | elf.nodes.appendAssumeCapacity(.ehdr); |
| 1151 | 2067 | |
| 1152 | 2068 | const ehdr: *ElfN.Ehdr = @ptrCast(@alignCast(elf.ni.ehdr.slice(&elf.mf))); |
| 1153 | | const EI = std.elf.EI; |
| 1154 | | @memcpy(ehdr.ident[0..std.elf.MAGIC.len], std.elf.MAGIC); |
| 1155 | | ehdr.ident[EI.CLASS] = @intFromEnum(class); |
| 1156 | | ehdr.ident[EI.DATA] = @intFromEnum(data); |
| 1157 | | ehdr.ident[EI.VERSION] = 1; |
| 1158 | | ehdr.ident[EI.OSABI] = @intFromEnum(osabi); |
| 1159 | | ehdr.ident[EI.ABIVERSION] = 0; |
| 1160 | | @memset(ehdr.ident[EI.PAD..], 0); |
| 2069 | ehdr.ident = .{ |
| 2070 | .class = class, |
| 2071 | .data = data, |
| 2072 | .version = 1, |
| 2073 | .osabi = osabi, |
| 2074 | .abiversion = 0, |
| 2075 | }; |
| 1161 | 2076 | ehdr.type = @"type"; |
| 1162 | 2077 | ehdr.machine = machine; |
| 1163 | 2078 | ehdr.version = 1; |
| ... | ... | @@ -1176,7 +2091,7 @@ fn initHeaders( |
| 1176 | 2091 | } |
| 1177 | 2092 | |
| 1178 | 2093 | assert(elf.ni.shdr == try elf.mf.addLastChildNode(gpa, elf.ni.file, .{ |
| 1179 | | .size = elf.ehdrField(.shentsize) * elf.ehdrField(.shnum), |
| 2094 | .size = @as(u64, elf.ehdrField(.shentsize)) * @as(u64, elf.ehdrField(.shnum)), |
| 1180 | 2095 | .alignment = elf.mf.flags.block_size, |
| 1181 | 2096 | .moved = true, |
| 1182 | 2097 | .resized = true, |
| ... | ... | @@ -1366,7 +2281,7 @@ fn initHeaders( |
| 1366 | 2281 | |
| 1367 | 2282 | const sh_undef: *ElfN.Shdr = @ptrCast(@alignCast(elf.ni.shdr.slice(&elf.mf))); |
| 1368 | 2283 | sh_undef.* = .{ |
| 1369 | | .name = try elf.string(.shstrtab, ""), |
| 2284 | .name = @intFromEnum(String(.shstrtab).empty), |
| 1370 | 2285 | .type = .NULL, |
| 1371 | 2286 | .flags = .{ .shf = .{} }, |
| 1372 | 2287 | .addr = 0, |
| ... | ... | @@ -1378,24 +2293,23 @@ fn initHeaders( |
| 1378 | 2293 | .entsize = 0, |
| 1379 | 2294 | }; |
| 1380 | 2295 | if (target_endian != native_endian) std.mem.byteSwapAllFields(ElfN.Shdr, sh_undef); |
| 1381 | | elf.shdrs.appendAssumeCapacity(.{ .si = .null, .rela_si = .null, .rela_free = .none }); |
| 2296 | elf.shdrs.appendAssumeCapacity(.{ .lsi = .null, .ni = .none, .rela_shndx = .UNDEF, .rela_free = .none }); |
| 1382 | 2297 | |
| 1383 | 2298 | elf.symtab.addOneAssumeCapacity().* = .{ |
| 1384 | | .ni = .none, |
| 1385 | | .loc_relocs = .none, |
| 1386 | | .target_relocs = .none, |
| 1387 | | .unused = 0, |
| 2299 | .node = .none, |
| 2300 | .first_target_reloc = .none, |
| 1388 | 2301 | }; |
| 1389 | | assert(elf.si.symtab == try elf.addSection(elf.ni.file, .{ |
| 2302 | assert(.symtab == try elf.addSection(elf.ni.file, .{ |
| 1390 | 2303 | .type = .SYMTAB, |
| 1391 | 2304 | .size = @sizeOf(ElfN.Sym) * 1, |
| 1392 | 2305 | .addralign = addr_align, |
| 1393 | 2306 | .entsize = @sizeOf(ElfN.Sym), |
| 1394 | 2307 | .node_align = elf.mf.flags.block_size, |
| 2308 | .info = 1, // index of first non-local symbol |
| 1395 | 2309 | })); |
| 1396 | 2310 | const symtab_null = @field(elf.symPtr(.null), @tagName(ct_class)); |
| 1397 | 2311 | symtab_null.* = .{ |
| 1398 | | .name = try elf.string(.strtab, ""), |
| 2312 | .name = @intFromEnum(String(.strtab).empty), |
| 1399 | 2313 | .value = 0, |
| 1400 | 2314 | .size = 0, |
| 1401 | 2315 | .info = .{ .type = .NOTYPE, .bind = .LOCAL }, |
| ... | ... | @@ -1408,55 +2322,56 @@ fn initHeaders( |
| 1408 | 2322 | ehdr.shstrndx = ehdr.shnum; |
| 1409 | 2323 | }, |
| 1410 | 2324 | } |
| 1411 | | assert(elf.si.shstrtab == try elf.addSection(elf.ni.file, .{ |
| 2325 | assert(.shstrtab == try elf.addSection(elf.ni.file, .{ |
| 1412 | 2326 | .type = .STRTAB, |
| 1413 | 2327 | .size = 1, |
| 1414 | 2328 | .entsize = 1, |
| 1415 | 2329 | .node_align = elf.mf.flags.block_size, |
| 1416 | 2330 | })); |
| 1417 | | try elf.renameSection(.symtab, ".symtab"); |
| 1418 | | try elf.renameSection(.shstrtab, ".shstrtab"); |
| 1419 | | elf.si.shstrtab.node(elf).slice(&elf.mf)[0] = 0; |
| 2331 | Section.Index.get(.shstrtab, elf).ni.slice(&elf.mf)[0] = 0; |
| 1420 | 2332 | |
| 1421 | | assert(elf.si.strtab == try elf.addSection(elf.ni.file, .{ |
| 2333 | try Section.Index.symtab.rename(elf, ".symtab"); |
| 2334 | try Section.Index.shstrtab.rename(elf, ".shstrtab"); |
| 2335 | |
| 2336 | assert(.strtab == try elf.addSection(elf.ni.file, .{ |
| 1422 | 2337 | .name = ".strtab", |
| 1423 | 2338 | .type = .STRTAB, |
| 1424 | 2339 | .size = 1, |
| 1425 | 2340 | .entsize = 1, |
| 1426 | 2341 | .node_align = elf.mf.flags.block_size, |
| 1427 | 2342 | })); |
| 1428 | | switch (elf.shdrPtr(elf.si.symtab.shndx(elf))) { |
| 1429 | | inline else => |shdr| elf.targetStore(&shdr.link, @intFromEnum(elf.si.strtab.shndx(elf))), |
| 2343 | Section.Index.get(.strtab, elf).ni.slice(&elf.mf)[0] = 0; |
| 2344 | switch (elf.shdrPtr(.symtab)) { |
| 2345 | inline else => |shdr| elf.targetStore(&shdr.link, @intFromEnum(Section.Index.strtab)), |
| 1430 | 2346 | } |
| 1431 | | elf.si.strtab.node(elf).slice(&elf.mf)[0] = 0; |
| 1432 | 2347 | |
| 1433 | | assert(elf.si.rodata == try elf.addSection(elf.ni.rodata, .{ |
| 2348 | assert(.rodata == try elf.addSection(elf.ni.rodata, .{ |
| 1434 | 2349 | .name = ".rodata", |
| 1435 | 2350 | .flags = .{ .ALLOC = true }, |
| 1436 | 2351 | .addralign = elf.mf.flags.block_size, |
| 1437 | 2352 | })); |
| 1438 | | assert(elf.si.text == try elf.addSection(elf.ni.text, .{ |
| 2353 | assert(.text == try elf.addSection(elf.ni.text, .{ |
| 1439 | 2354 | .name = ".text", |
| 1440 | 2355 | .flags = .{ .ALLOC = true, .EXECINSTR = true }, |
| 1441 | 2356 | .addralign = elf.mf.flags.block_size, |
| 1442 | 2357 | })); |
| 1443 | | assert(elf.si.data == try elf.addSection(elf.ni.data, .{ |
| 2358 | assert(.data == try elf.addSection(elf.ni.data, .{ |
| 1444 | 2359 | .name = ".data", |
| 1445 | 2360 | .flags = .{ .WRITE = true, .ALLOC = true }, |
| 1446 | 2361 | .addralign = elf.mf.flags.block_size, |
| 1447 | 2362 | })); |
| 1448 | | assert(elf.si.data_rel_ro == try elf.addSection(elf.ni.data_rel_ro, .{ |
| 2363 | assert(.data_rel_ro == try elf.addSection(elf.ni.data_rel_ro, .{ |
| 1449 | 2364 | .name = ".data.rel.ro", |
| 1450 | 2365 | .flags = .{ .WRITE = true, .ALLOC = true }, |
| 1451 | 2366 | .addralign = elf.mf.flags.block_size, |
| 1452 | 2367 | })); |
| 1453 | 2368 | if (@"type" != .REL) { |
| 1454 | | assert(elf.si.got == try elf.addSection(elf.ni.data_rel_ro, .{ |
| 2369 | elf.shndx.got = try elf.addSection(elf.ni.data_rel_ro, .{ |
| 1455 | 2370 | .name = ".got", |
| 1456 | 2371 | .flags = .{ .WRITE = true, .ALLOC = true }, |
| 1457 | 2372 | .addralign = addr_align, |
| 1458 | | })); |
| 1459 | | assert(elf.si.got_plt == try elf.addSection( |
| 2373 | }); |
| 2374 | elf.shndx.got_plt = try elf.addSection( |
| 1460 | 2375 | if (elf.options.z_now) elf.ni.data_rel_ro else elf.ni.data, |
| 1461 | 2376 | .{ |
| 1462 | 2377 | .name = ".got.plt", |
| ... | ... | @@ -1469,26 +2384,26 @@ fn initHeaders( |
| 1469 | 2384 | }, |
| 1470 | 2385 | .addralign = addr_align, |
| 1471 | 2386 | }, |
| 1472 | | )); |
| 2387 | ); |
| 1473 | 2388 | const plt_size: std.elf.Xword, const plt_align: std.mem.Alignment, const plt_sec = |
| 1474 | 2389 | switch (machine) { |
| 1475 | 2390 | else => @panic(@tagName(machine)), |
| 1476 | 2391 | .X86_64 => .{ 16, .@"16", true }, |
| 1477 | 2392 | }; |
| 1478 | | assert(elf.si.plt == try elf.addSection(elf.ni.text, .{ |
| 2393 | elf.shndx.plt = try elf.addSection(elf.ni.text, .{ |
| 1479 | 2394 | .name = ".plt", |
| 1480 | 2395 | .type = .PROGBITS, |
| 1481 | 2396 | .flags = .{ .ALLOC = true, .EXECINSTR = true }, |
| 1482 | 2397 | .size = plt_size, |
| 1483 | 2398 | .addralign = plt_align, |
| 1484 | 2399 | .node_align = elf.mf.flags.block_size, |
| 1485 | | })); |
| 1486 | | if (plt_sec) assert(elf.si.plt_sec == try elf.addSection(elf.ni.text, .{ |
| 2400 | }); |
| 2401 | if (plt_sec) elf.shndx.plt_sec = try elf.addSection(elf.ni.text, .{ |
| 1487 | 2402 | .name = ".plt.sec", |
| 1488 | 2403 | .flags = .{ .ALLOC = true, .EXECINSTR = true }, |
| 1489 | 2404 | .addralign = plt_align, |
| 1490 | 2405 | .node_align = elf.mf.flags.block_size, |
| 1491 | | })); |
| 2406 | }); |
| 1492 | 2407 | if (maybe_interp) |interp| { |
| 1493 | 2408 | const interp_ni = try elf.mf.addLastChildNode(gpa, elf.ni.rodata, .{ |
| 1494 | 2409 | .size = interp.len + 1, |
| ... | ... | @@ -1499,13 +2414,13 @@ fn initHeaders( |
| 1499 | 2414 | elf.nodes.appendAssumeCapacity(.{ .segment = interp_phndx }); |
| 1500 | 2415 | elf.phdrs.items[interp_phndx] = interp_ni; |
| 1501 | 2416 | |
| 1502 | | const sec_interp_si = try elf.addSection(interp_ni, .{ |
| 2417 | const sec_interp_shndx = try elf.addSection(interp_ni, .{ |
| 1503 | 2418 | .name = ".interp", |
| 1504 | 2419 | .type = .PROGBITS, |
| 1505 | 2420 | .flags = .{ .ALLOC = true }, |
| 1506 | 2421 | .size = @intCast(interp.len + 1), |
| 1507 | 2422 | }); |
| 1508 | | const sec_interp = sec_interp_si.node(elf).slice(&elf.mf); |
| 2423 | const sec_interp = sec_interp_shndx.get(elf).ni.slice(&elf.mf); |
| 1509 | 2424 | @memcpy(sec_interp[0..interp.len], interp); |
| 1510 | 2425 | sec_interp[interp.len] = 0; |
| 1511 | 2426 | } |
| ... | ... | @@ -1518,7 +2433,7 @@ fn initHeaders( |
| 1518 | 2433 | elf.nodes.appendAssumeCapacity(.{ .segment = dynamic_phndx }); |
| 1519 | 2434 | elf.phdrs.items[dynamic_phndx] = dynamic_ni; |
| 1520 | 2435 | |
| 1521 | | elf.si.dynstr = try elf.addSection(elf.ni.rodata, .{ |
| 2436 | const dynstr_shndx = try elf.addSection(elf.ni.rodata, .{ |
| 1522 | 2437 | .name = ".dynstr", |
| 1523 | 2438 | .type = .STRTAB, |
| 1524 | 2439 | .flags = .{ .ALLOC = true }, |
| ... | ... | @@ -1526,26 +2441,27 @@ fn initHeaders( |
| 1526 | 2441 | .entsize = 1, |
| 1527 | 2442 | .node_align = elf.mf.flags.block_size, |
| 1528 | 2443 | }); |
| 1529 | | const dynstr_shndx = elf.si.dynstr.shndx(elf); |
| 1530 | | elf.dynsym.putAssumeCapacityNoClobber(.null, {}); |
| 2444 | dynstr_shndx.get(elf).ni.slice(&elf.mf)[0] = 0; |
| 2445 | elf.shndx.dynstr = dynstr_shndx; |
| 2446 | |
| 1531 | 2447 | switch (class) { |
| 1532 | 2448 | .NONE, _ => unreachable, |
| 1533 | 2449 | inline else => |ct_class| { |
| 1534 | 2450 | const Sym = ct_class.ElfN().Sym; |
| 1535 | | elf.si.dynsym = try elf.addSection(elf.ni.rodata, .{ |
| 2451 | elf.shndx.dynsym = try elf.addSection(elf.ni.rodata, .{ |
| 1536 | 2452 | .name = ".dynsym", |
| 1537 | 2453 | .type = .DYNSYM, |
| 1538 | 2454 | .flags = .{ .ALLOC = true }, |
| 1539 | 2455 | .size = @sizeOf(Sym) * 1, |
| 1540 | | .link = @intFromEnum(dynstr_shndx), |
| 2456 | .link = dynstr_shndx.toSection().?, |
| 1541 | 2457 | .info = 1, |
| 1542 | 2458 | .addralign = addr_align, |
| 1543 | 2459 | .entsize = @sizeOf(Sym), |
| 1544 | 2460 | .node_align = elf.mf.flags.block_size, |
| 1545 | 2461 | }); |
| 1546 | | const dynsym_null = &@field(elf.dynsymSlice(), @tagName(ct_class))[0]; |
| 2462 | const dynsym_null = @field(elf.dynsymPtr(0), @tagName(ct_class)); |
| 1547 | 2463 | dynsym_null.* = .{ |
| 1548 | | .name = try elf.string(.dynstr, ""), |
| 2464 | .name = @intFromEnum(String(.dynstr).empty), |
| 1549 | 2465 | .value = 0, |
| 1550 | 2466 | .size = 0, |
| 1551 | 2467 | .info = .{ .type = .NOTYPE, .bind = .LOCAL }, |
| ... | ... | @@ -1562,57 +2478,57 @@ fn initHeaders( |
| 1562 | 2478 | .NONE, _ => unreachable, |
| 1563 | 2479 | inline else => |ct_class| @sizeOf(ct_class.ElfN().Rela), |
| 1564 | 2480 | }; |
| 1565 | | elf.si.got.shndx(elf).get(elf).rela_si = try elf.addSection(elf.ni.rodata, .{ |
| 2481 | elf.shndx.got.get(elf).rela_shndx = try elf.addSection(elf.ni.rodata, .{ |
| 1566 | 2482 | .name = ".rela.dyn", |
| 1567 | 2483 | .type = .RELA, |
| 1568 | 2484 | .flags = .{ .ALLOC = true }, |
| 1569 | | .link = @intFromEnum(elf.si.dynsym.shndx(elf)), |
| 2485 | .link = elf.shndx.dynsym.toSection().?, |
| 1570 | 2486 | .addralign = addr_align, |
| 1571 | 2487 | .entsize = rela_size, |
| 1572 | 2488 | .node_align = elf.mf.flags.block_size, |
| 1573 | 2489 | }); |
| 1574 | | const got_plt_shndx = elf.si.got_plt.shndx(elf); |
| 1575 | | got_plt_shndx.get(elf).rela_si = try elf.addSection(elf.ni.rodata, .{ |
| 2490 | const got_plt_shndx = elf.shndx.got_plt; |
| 2491 | got_plt_shndx.get(elf).rela_shndx = try elf.addSection(elf.ni.rodata, .{ |
| 1576 | 2492 | .name = ".rela.plt", |
| 1577 | 2493 | .type = .RELA, |
| 1578 | 2494 | .flags = .{ .ALLOC = true, .INFO_LINK = true }, |
| 1579 | | .link = @intFromEnum(elf.si.dynsym.shndx(elf)), |
| 1580 | | .info = @intFromEnum(got_plt_shndx), |
| 2495 | .link = elf.shndx.dynsym.toSection().?, |
| 2496 | .info = got_plt_shndx.toSection().?, |
| 1581 | 2497 | .addralign = addr_align, |
| 1582 | 2498 | .entsize = rela_size, |
| 1583 | 2499 | .node_align = elf.mf.flags.block_size, |
| 1584 | 2500 | }); |
| 1585 | | elf.si.dynamic = try elf.addSection(dynamic_ni, .{ |
| 2501 | elf.shndx.dynamic = try elf.addSection(dynamic_ni, .{ |
| 1586 | 2502 | .name = ".dynamic", |
| 1587 | 2503 | .type = .DYNAMIC, |
| 1588 | 2504 | .flags = .{ .ALLOC = true, .WRITE = true }, |
| 1589 | | .link = @intFromEnum(dynstr_shndx), |
| 2505 | .link = dynstr_shndx.toSection().?, |
| 1590 | 2506 | .entsize = @intCast(addr_align.toByteUnits() * 2), |
| 1591 | 2507 | .node_align = addr_align, |
| 1592 | 2508 | }); |
| 1593 | 2509 | switch (machine) { |
| 1594 | 2510 | else => @panic(@tagName(machine)), |
| 1595 | 2511 | .X86_64 => { |
| 1596 | | @memcpy(elf.si.plt.node(elf).slice(&elf.mf)[0..16], &[16]u8{ |
| 2512 | const plt_ni = elf.shndx.plt.get(elf).ni; |
| 2513 | const got_plt_sym: Symbol.Id = .local(elf.shndx.got_plt.get(elf).lsi); |
| 2514 | @memcpy(plt_ni.slice(&elf.mf)[0..16], &[16]u8{ |
| 1597 | 2515 | 0xff, 0x35, 0x00, 0x00, 0x00, 0x00, // push 0x0(%rip) |
| 1598 | 2516 | 0xff, 0x25, 0x00, 0x00, 0x00, 0x00, // jmp *0x0(%rip) |
| 1599 | 2517 | 0x0f, 0x1f, 0x40, 0x00, // nopl 0x0(%rax) |
| 1600 | 2518 | }); |
| 1601 | | const plt_sym = elf.si.plt.get(elf); |
| 1602 | | assert(plt_sym.loc_relocs == .none); |
| 1603 | | plt_sym.loc_relocs = @enumFromInt(elf.relocs.items.len); |
| 1604 | | try elf.ensureUnusedRelocCapacity(elf.si.plt, 2); |
| 2519 | elf.first_plt_reloc = @enumFromInt(elf.relocs.items.len); |
| 2520 | try elf.ensureUnusedRelocCapacity(plt_ni, 2); |
| 1605 | 2521 | elf.addRelocAssumeCapacity( |
| 1606 | | elf.si.plt, |
| 2522 | plt_ni, |
| 1607 | 2523 | 2, |
| 1608 | | elf.si.got_plt, |
| 2524 | got_plt_sym, |
| 1609 | 2525 | 8 * 1 - 4, |
| 1610 | 2526 | .{ .X86_64 = .PC32 }, |
| 1611 | 2527 | ); |
| 1612 | 2528 | elf.addRelocAssumeCapacity( |
| 1613 | | elf.si.plt, |
| 2529 | plt_ni, |
| 1614 | 2530 | 8, |
| 1615 | | elf.si.got_plt, |
| 2531 | got_plt_sym, |
| 1616 | 2532 | 8 * 2 - 4, |
| 1617 | 2533 | .{ .X86_64 = .PC32 }, |
| 1618 | 2534 | ); |
| ... | ... | @@ -1632,7 +2548,7 @@ fn initHeaders( |
| 1632 | 2548 | assert(maybe_interp == null); |
| 1633 | 2549 | assert(!have_dynamic_section); |
| 1634 | 2550 | } |
| 1635 | | if (comp.config.any_non_single_threaded) elf.si.tdata = try elf.addSection(elf.ni.tls, .{ |
| 2551 | if (comp.config.any_non_single_threaded) elf.shndx.tdata = try elf.addSection(elf.ni.tls, .{ |
| 1636 | 2552 | .name = ".tdata", |
| 1637 | 2553 | .flags = .{ .WRITE = true, .ALLOC = true, .TLS = true }, |
| 1638 | 2554 | .addralign = elf.mf.flags.block_size, |
| ... | ... | @@ -1642,7 +2558,7 @@ fn initHeaders( |
| 1642 | 2558 | |
| 1643 | 2559 | pub fn startProgress(elf: *Elf, prog_node: std.Progress.Node) void { |
| 1644 | 2560 | prog_node.increaseEstimatedTotalItems(4); |
| 1645 | | elf.const_prog_node = prog_node.start("Constants", elf.pending_uavs.count()); |
| 2561 | elf.const_prog_node = prog_node.start("Constants", elf.pending_uavs.items.len); |
| 1646 | 2562 | elf.synth_prog_node = prog_node.start("Synthetics", count: { |
| 1647 | 2563 | var count: usize = 0; |
| 1648 | 2564 | for (&elf.lazy.values) |*lazy| count += lazy.map.count() - lazy.pending_index; |
| ... | ... | @@ -1669,35 +2585,105 @@ pub fn endProgress(elf: *Elf) void { |
| 1669 | 2585 | fn getNode(elf: *const Elf, ni: MappedFile.Node.Index) Node { |
| 1670 | 2586 | return elf.nodes.get(@intFromEnum(ni)); |
| 1671 | 2587 | } |
| 2588 | /// Asserts that `ni` is a section, input section, NAV, UAV, or lazy code/data. |
| 2589 | fn getNodeShndx(elf: *Elf, ni: MappedFile.Node.Index) Section.Index { |
| 2590 | return switch (elf.getNode(ni)) { |
| 2591 | .file => unreachable, |
| 2592 | .ehdr => unreachable, |
| 2593 | .shdr => unreachable, |
| 2594 | .segment => unreachable, |
| 2595 | |
| 2596 | .section => |shndx| shndx, |
| 2597 | |
| 2598 | .input_section, |
| 2599 | .nav, |
| 2600 | .uav, |
| 2601 | .lazy_code, |
| 2602 | .lazy_const_data, |
| 2603 | => elf.getNode(ni.parent(&elf.mf)).section, |
| 2604 | }; |
| 2605 | } |
| 1672 | 2606 | fn computeNodeVAddr(elf: *Elf, ni: MappedFile.Node.Index) u64 { |
| 1673 | | const parent_vaddr = parent_vaddr: { |
| 1674 | | const parent_ni = ni.parent(&elf.mf); |
| 1675 | | const parent_si = switch (elf.getNode(parent_ni)) { |
| 1676 | | .file => return 0, |
| 1677 | | .ehdr, .shdr => unreachable, |
| 1678 | | .segment => |phndx| break :parent_vaddr switch (elf.phdrSlice()) { |
| 1679 | | inline else => |phdr| elf.targetLoad(&phdr[phndx].vaddr), |
| 1680 | | }, |
| 1681 | | .section => |si| si, |
| 1682 | | .input_section => unreachable, |
| 1683 | | inline .nav, .uav, .lazy_code, .lazy_const_data => |mi| mi.symbol(elf), |
| 1684 | | }; |
| 1685 | | break :parent_vaddr if (parent_si == elf.si.tdata) 0 else switch (elf.symPtr(parent_si)) { |
| 1686 | | inline else => |sym| elf.targetLoad(&sym.value), |
| 1687 | | }; |
| 2607 | const parent_vaddr = switch (elf.getNode(ni.parent(&elf.mf))) { |
| 2608 | .file => return 0, |
| 2609 | .ehdr, .shdr => unreachable, |
| 2610 | .segment => |phndx| switch (elf.phdrSlice()) { |
| 2611 | inline else => |phdr| elf.targetLoad(&phdr[phndx].vaddr), |
| 2612 | }, |
| 2613 | .section => |shndx| if (shndx == elf.shndx.tdata) 0 else shndx.vaddr(elf), |
| 2614 | .input_section => unreachable, |
| 2615 | inline .nav, .uav, .lazy_code, .lazy_const_data => |i| Symbol.Id.local(i.symbol(elf)).value(elf), |
| 1688 | 2616 | }; |
| 1689 | 2617 | const offset, _ = ni.location(&elf.mf).resolve(&elf.mf); |
| 1690 | 2618 | return parent_vaddr + offset; |
| 1691 | 2619 | } |
| 1692 | 2620 | |
| 1693 | | pub fn identClass(elf: *const Elf) std.elf.CLASS { |
| 2621 | /// Deletes any existing relocations in the given node, and marks the start of the node's contiguous |
| 2622 | /// sequence of relocations, so that the caller may append the node's updated relocations. |
| 2623 | /// |
| 2624 | /// Asserts that `ni` must be a node which supports relocations (see `Elf.Node`). Does not support |
| 2625 | /// the special-case sections '.plt' and '.dynamic'. |
| 2626 | fn resetNodeRelocs(elf: *Elf, ni: MappedFile.Node.Index) void { |
| 2627 | const first_reloc_ptr: *Reloc.Index = switch (elf.getNode(ni)) { |
| 2628 | .file => unreachable, // cannot contain relocs |
| 2629 | .ehdr => unreachable, // cannot contain relocs |
| 2630 | .shdr => unreachable, // cannot contain relocs |
| 2631 | .segment => unreachable, // cannot contain relocs |
| 2632 | .section => unreachable, // cannot contain relocs (.plt and .dynamic unsupported) |
| 2633 | .input_section => |isi| &elf.input_sections.items[@intFromEnum(isi)].first_reloc, |
| 2634 | .nav => |nmi| &elf.navs.values()[@intFromEnum(nmi)].first_reloc, |
| 2635 | .uav => |umi| &elf.uavs.values()[@intFromEnum(umi)].first_reloc, |
| 2636 | inline .lazy_code, .lazy_const_data => |lmi| &elf.lazy.getPtr(lmi.ref().kind).map.values()[lmi.ref().index].first_reloc, |
| 2637 | }; |
| 2638 | if (first_reloc_ptr.* != .none) { |
| 2639 | for (elf.relocs.items[@intFromEnum(first_reloc_ptr.*)..]) |*reloc| { |
| 2640 | if (reloc.node != ni) break; |
| 2641 | reloc.delete(elf); |
| 2642 | } |
| 2643 | } |
| 2644 | first_reloc_ptr.* = @enumFromInt(elf.relocs.items.len); |
| 2645 | } |
| 2646 | |
| 2647 | /// Given that `node` has moved, updates all relocations in `node` (starting from `first_reloc`) as |
| 2648 | /// needed. In relocatables, this means updating the offsets of those relocations. In ELF modules, |
| 2649 | /// this means applying the relocations. |
| 2650 | fn flushMovedNodeRelocs( |
| 2651 | elf: *Elf, |
| 2652 | node: MappedFile.Node.Index, |
| 2653 | node_vaddr: u64, |
| 2654 | first_reloc: Reloc.Index, |
| 2655 | ) void { |
| 2656 | if (first_reloc == .none) return; |
| 2657 | switch (elf.ehdrField(.type)) { |
| 2658 | .NONE, .CORE, _ => unreachable, |
| 2659 | .REL => { |
| 2660 | // In a relocatable, we're not actually applying any relocations ourselves, but we need |
| 2661 | // to update the offsets of the relocation entries since the node they're in has moved. |
| 2662 | for (elf.relocs.items[@intFromEnum(first_reloc)..]) |*reloc| { |
| 2663 | if (reloc.node != node) break; |
| 2664 | reloc.updateNodeOffset(elf, node_vaddr); |
| 2665 | } |
| 2666 | }, |
| 2667 | .EXEC, .DYN => { |
| 2668 | // For an ELF module, we just need to apply relocations. |
| 2669 | for (elf.relocs.items[@intFromEnum(first_reloc)..]) |*reloc| { |
| 2670 | if (reloc.node != node) break; |
| 2671 | reloc.apply(elf); |
| 2672 | } |
| 2673 | // TODO: once we're emitting runtime relocation entries, we need to update their offsets |
| 2674 | // too, like the logic for relocatables above. |
| 2675 | }, |
| 2676 | } |
| 2677 | } |
| 2678 | |
| 2679 | fn identClass(elf: *const Elf) std.elf.CLASS { |
| 1694 | 2680 | return @enumFromInt(elf.mf.memory_map.memory[std.elf.EI.CLASS]); |
| 1695 | 2681 | } |
| 1696 | | pub fn identData(elf: *const Elf) std.elf.DATA { |
| 2682 | fn identData(elf: *const Elf) std.elf.DATA { |
| 1697 | 2683 | return @enumFromInt(elf.mf.memory_map.memory[std.elf.EI.DATA]); |
| 1698 | 2684 | } |
| 1699 | 2685 | |
| 1700 | | pub fn targetEndian(elf: *const Elf) std.lang.Endian { |
| 2686 | fn targetEndian(elf: *const Elf) std.lang.Endian { |
| 1701 | 2687 | return switch (elf.identData()) { |
| 1702 | 2688 | .NONE, _ => unreachable, |
| 1703 | 2689 | .@"2LSB" => .little, |
| ... | ... | @@ -1731,12 +2717,12 @@ fn targetStore(elf: *const Elf, ptr: anytype, val: @typeInfo(@TypeOf(ptr)).point |
| 1731 | 2717 | }; |
| 1732 | 2718 | } |
| 1733 | 2719 | |
| 1734 | | pub const EhdrPtr = union(std.elf.CLASS) { |
| 2720 | const EhdrPtr = union(std.elf.CLASS) { |
| 1735 | 2721 | NONE: noreturn, |
| 1736 | 2722 | @"32": *std.elf.Elf32.Ehdr, |
| 1737 | 2723 | @"64": *std.elf.Elf64.Ehdr, |
| 1738 | 2724 | }; |
| 1739 | | pub fn ehdrPtr(elf: *Elf) EhdrPtr { |
| 2725 | fn ehdrPtr(elf: *Elf) EhdrPtr { |
| 1740 | 2726 | const slice = elf.ni.ehdr.slice(&elf.mf); |
| 1741 | 2727 | return switch (elf.identClass()) { |
| 1742 | 2728 | .NONE, _ => unreachable, |
| ... | ... | @@ -1747,7 +2733,7 @@ pub fn ehdrPtr(elf: *Elf) EhdrPtr { |
| 1747 | 2733 | ), |
| 1748 | 2734 | }; |
| 1749 | 2735 | } |
| 1750 | | pub fn ehdrField( |
| 2736 | fn ehdrField( |
| 1751 | 2737 | elf: *Elf, |
| 1752 | 2738 | comptime field: std.meta.FieldEnum(std.elf.Elf64.Ehdr), |
| 1753 | 2739 | ) @FieldType(std.elf.Elf64.Ehdr, @tagName(field)) { |
| ... | ... | @@ -1756,12 +2742,12 @@ pub fn ehdrField( |
| 1756 | 2742 | }; |
| 1757 | 2743 | } |
| 1758 | 2744 | |
| 1759 | | pub const PhdrSlice = union(std.elf.CLASS) { |
| 2745 | const PhdrSlice = union(std.elf.CLASS) { |
| 1760 | 2746 | NONE: noreturn, |
| 1761 | 2747 | @"32": []std.elf.Elf32.Phdr, |
| 1762 | 2748 | @"64": []std.elf.Elf64.Phdr, |
| 1763 | 2749 | }; |
| 1764 | | pub fn phdrSlice(elf: *Elf) PhdrSlice { |
| 2750 | fn phdrSlice(elf: *Elf) PhdrSlice { |
| 1765 | 2751 | assert(elf.ehdrField(.type) != .REL); |
| 1766 | 2752 | const slice = elf.ni.phdr.slice(&elf.mf); |
| 1767 | 2753 | return switch (elf.identClass()) { |
| ... | ... | @@ -1774,104 +2760,47 @@ pub fn phdrSlice(elf: *Elf) PhdrSlice { |
| 1774 | 2760 | }; |
| 1775 | 2761 | } |
| 1776 | 2762 | |
| 1777 | | pub const ShdrSlice = union(std.elf.CLASS) { |
| 1778 | | NONE: noreturn, |
| 1779 | | @"32": []std.elf.Elf32.Shdr, |
| 1780 | | @"64": []std.elf.Elf64.Shdr, |
| 1781 | | }; |
| 1782 | | pub fn shdrSlice(elf: *Elf) ShdrSlice { |
| 1783 | | const slice = elf.ni.shdr.slice(&elf.mf); |
| 1784 | | return switch (elf.identClass()) { |
| 1785 | | .NONE, _ => unreachable, |
| 1786 | | inline else => |class| @unionInit( |
| 1787 | | ShdrSlice, |
| 1788 | | @tagName(class), |
| 1789 | | @ptrCast(@alignCast(slice)), |
| 1790 | | ), |
| 1791 | | }; |
| 1792 | | } |
| 1793 | | |
| 1794 | | pub const ShdrPtr = union(std.elf.CLASS) { |
| 2763 | const ShdrPtr = union(std.elf.CLASS) { |
| 1795 | 2764 | NONE: noreturn, |
| 1796 | 2765 | @"32": *std.elf.Elf32.Shdr, |
| 1797 | 2766 | @"64": *std.elf.Elf64.Shdr, |
| 1798 | 2767 | }; |
| 1799 | | pub fn shdrPtr(elf: *Elf, shndx: Symbol.Index.Shndx) ShdrPtr { |
| 1800 | | return switch (elf.shdrSlice()) { |
| 1801 | | inline else => |shdrs, class| @unionInit(ShdrPtr, @tagName(class), &shdrs[@intFromEnum(shndx)]), |
| 1802 | | }; |
| 1803 | | } |
| 1804 | | |
| 1805 | | pub const SymtabSlice = union(std.elf.CLASS) { |
| 1806 | | NONE: noreturn, |
| 1807 | | @"32": []std.elf.Elf32.Sym, |
| 1808 | | @"64": []std.elf.Elf64.Sym, |
| 1809 | | }; |
| 1810 | | pub fn symtabSlice(elf: *Elf) SymtabSlice { |
| 1811 | | const slice = elf.si.symtab.node(elf).slice(&elf.mf); |
| 1812 | | return switch (elf.identClass()) { |
| 2768 | fn shdrPtr(elf: *Elf, shndx: Section.Index) ShdrPtr { |
| 2769 | const raw_slice = elf.ni.shdr.slice(&elf.mf); |
| 2770 | switch (elf.identClass()) { |
| 1813 | 2771 | .NONE, _ => unreachable, |
| 1814 | | inline else => |class| @unionInit(SymtabSlice, @tagName(class), @ptrCast(@alignCast( |
| 1815 | | slice[0..std.mem.alignBackwardAnyAlign(usize, slice.len, @sizeOf(class.ElfN().Sym))], |
| 1816 | | ))), |
| 1817 | | }; |
| 2772 | inline else => |class| { |
| 2773 | const shdr_slice: []class.ElfN().Shdr = @ptrCast(@alignCast(raw_slice)); |
| 2774 | const shdr_ptr = &shdr_slice[@intFromEnum(shndx)]; |
| 2775 | return @unionInit(ShdrPtr, @tagName(class), shdr_ptr); |
| 2776 | }, |
| 2777 | } |
| 1818 | 2778 | } |
| 1819 | 2779 | |
| 1820 | | pub const SymPtr = union(std.elf.CLASS) { |
| 2780 | const SymPtr = union(std.elf.CLASS) { |
| 1821 | 2781 | NONE: noreturn, |
| 1822 | 2782 | @"32": *std.elf.Elf32.Sym, |
| 1823 | 2783 | @"64": *std.elf.Elf64.Sym, |
| 1824 | | }; |
| 1825 | | pub fn symPtr(elf: *Elf, si: Symbol.Index) SymPtr { |
| 1826 | | return switch (elf.symtabSlice()) { |
| 1827 | | inline else => |syms, class| @unionInit(SymPtr, @tagName(class), &syms[@intFromEnum(si)]), |
| 1828 | | }; |
| 1829 | | } |
| 1830 | | |
| 1831 | | pub fn dynsymSlice(elf: *Elf) SymtabSlice { |
| 1832 | | const slice = elf.si.dynsym.node(elf).slice(&elf.mf); |
| 1833 | | return switch (elf.identClass()) { |
| 1834 | | .NONE, _ => unreachable, |
| 1835 | | inline else => |class| @unionInit(SymtabSlice, @tagName(class), @ptrCast(@alignCast( |
| 1836 | | slice[0..std.mem.alignBackwardAnyAlign(usize, slice.len, @sizeOf(class.ElfN().Sym))], |
| 1837 | | ))), |
| 1838 | | }; |
| 1839 | | } |
| 1840 | | |
| 1841 | | fn addSymbolAssumeCapacity(elf: *Elf) Symbol.Index { |
| 1842 | | defer elf.symtab.addOneAssumeCapacity().* = .{ |
| 1843 | | .ni = .none, |
| 1844 | | .loc_relocs = .none, |
| 1845 | | .target_relocs = .none, |
| 1846 | | .unused = 0, |
| 1847 | | }; |
| 1848 | | return @enumFromInt(elf.symtab.items.len); |
| 1849 | | } |
| 1850 | | |
| 1851 | | fn initSymbolAssumeCapacity(elf: *Elf, opts: Symbol.Index.InitOptions) !Symbol.Index { |
| 1852 | | const si = elf.addSymbolAssumeCapacity(); |
| 1853 | | try si.init(elf, opts); |
| 1854 | | return si; |
| 1855 | | } |
| 1856 | | |
| 1857 | | pub fn globalSymbol(elf: *Elf, opts: struct { |
| 1858 | | name: []const u8, |
| 1859 | | lib_name: ?[]const u8 = null, |
| 1860 | | type: std.elf.STT, |
| 1861 | | bind: std.elf.STB = .GLOBAL, |
| 1862 | | visibility: std.elf.STV = .DEFAULT, |
| 1863 | | }) !Symbol.Index { |
| 1864 | | const gpa = elf.base.comp.gpa; |
| 1865 | | try elf.symtab.ensureUnusedCapacity(gpa, 1); |
| 1866 | | const global_gop = try elf.globals.getOrPut(gpa, try elf.string(.strtab, opts.name)); |
| 1867 | | if (!global_gop.found_existing) global_gop.value_ptr.* = try elf.initSymbolAssumeCapacity(.{ |
| 1868 | | .name = opts.name, |
| 1869 | | .lib_name = opts.lib_name, |
| 1870 | | .type = opts.type, |
| 1871 | | .bind = opts.bind, |
| 1872 | | .visibility = opts.visibility, |
| 1873 | | }); |
| 1874 | | return global_gop.value_ptr.*; |
| 2784 | }; |
| 2785 | fn symPtr(elf: *Elf, index: Symbol.Index) SymPtr { |
| 2786 | const raw_slice = Section.Index.symtab.get(elf).ni.slice(&elf.mf); |
| 2787 | switch (elf.shdrPtr(.symtab)) { |
| 2788 | inline else => |shdr, class| { |
| 2789 | const size = elf.targetLoad(&shdr.size); |
| 2790 | const slice: []class.ElfN().Sym = @ptrCast(@alignCast(raw_slice[0..@intCast(size)])); |
| 2791 | return @unionInit(SymPtr, @tagName(class), &slice[@intFromEnum(index)]); |
| 2792 | }, |
| 2793 | } |
| 2794 | } |
| 2795 | fn dynsymPtr(elf: *Elf, index: u32) SymPtr { |
| 2796 | const raw_slice = elf.shndx.dynsym.get(elf).ni.slice(&elf.mf); |
| 2797 | switch (elf.shdrPtr(elf.shndx.dynsym)) { |
| 2798 | inline else => |shdr, class| { |
| 2799 | const size = elf.targetLoad(&shdr.size); |
| 2800 | const slice: []class.ElfN().Sym = @ptrCast(@alignCast(raw_slice[0..@intCast(size)])); |
| 2801 | return @unionInit(SymPtr, @tagName(class), &slice[index]); |
| 2802 | }, |
| 2803 | } |
| 1875 | 2804 | } |
| 1876 | 2805 | |
| 1877 | 2806 | fn navType( |
| ... | ... | @@ -1886,97 +2815,135 @@ fn navType( |
| 1886 | 2815 | else |
| 1887 | 2816 | .OBJECT; |
| 1888 | 2817 | } |
| 1889 | | fn namedSection(elf: *const Elf, name: []const u8) ?Symbol.Index { |
| 2818 | fn namedSection(elf: *const Elf, name: []const u8) ?Section.Index { |
| 1890 | 2819 | if (std.mem.eql(u8, name, ".rodata") or |
| 1891 | | std.mem.startsWith(u8, name, ".rodata.")) return elf.si.rodata; |
| 2820 | std.mem.startsWith(u8, name, ".rodata.")) return .rodata; |
| 1892 | 2821 | if (std.mem.eql(u8, name, ".text") or |
| 1893 | | std.mem.startsWith(u8, name, ".text.")) return elf.si.text; |
| 2822 | std.mem.startsWith(u8, name, ".text.")) return .text; |
| 1894 | 2823 | if (std.mem.eql(u8, name, ".data") or |
| 1895 | | std.mem.startsWith(u8, name, ".data.")) return elf.si.data; |
| 2824 | std.mem.startsWith(u8, name, ".data.")) return .data; |
| 1896 | 2825 | if (std.mem.eql(u8, name, ".tdata") or |
| 1897 | | std.mem.startsWith(u8, name, ".tdata.")) return elf.si.tdata; |
| 2826 | std.mem.startsWith(u8, name, ".tdata.")) return elf.shndx.tdata; |
| 1898 | 2827 | return null; |
| 1899 | 2828 | } |
| 1900 | | fn navSection( |
| 1901 | | elf: *Elf, |
| 1902 | | ip: *const InternPool, |
| 1903 | | nav_resolved: @typeInfo(@FieldType(InternPool.Nav, "resolved")).optional.child, |
| 1904 | | ) Symbol.Index { |
| 1905 | | if (nav_resolved.@"linksection".toSlice(ip)) |@"linksection"| |
| 1906 | | if (elf.namedSection(@"linksection")) |si| return si; |
| 1907 | | return switch (navType( |
| 1908 | | ip, |
| 1909 | | nav_resolved, |
| 1910 | | elf.base.comp.config.any_non_single_threaded, |
| 1911 | | )) { |
| 1912 | | else => unreachable, |
| 1913 | | .FUNC => elf.si.text, |
| 1914 | | .OBJECT => elf.si.data, |
| 1915 | | .TLS => elf.si.tdata, |
| 1916 | | }; |
| 1917 | | } |
| 1918 | 2829 | fn navMapIndex(elf: *Elf, zcu: *Zcu, nav_index: InternPool.Nav.Index) !Node.NavMapIndex { |
| 1919 | 2830 | const gpa = zcu.gpa; |
| 1920 | 2831 | const ip = &zcu.intern_pool; |
| 1921 | 2832 | const nav = ip.getNav(nav_index); |
| 1922 | | try elf.symtab.ensureUnusedCapacity(gpa, 1); |
| 1923 | | const nav_gop = try elf.navs.getOrPut(gpa, nav_index); |
| 1924 | | if (!nav_gop.found_existing) nav_gop.value_ptr.* = try elf.initSymbolAssumeCapacity(.{ |
| 1925 | | .name = nav.fqn.toSlice(ip), |
| 1926 | | .type = navType(ip, nav.resolved.?, elf.base.comp.config.any_non_single_threaded), |
| 1927 | | }); |
| 1928 | | return @enumFromInt(nav_gop.index); |
| 1929 | | } |
| 1930 | | pub fn navSymbol(elf: *Elf, zcu: *Zcu, nav_index: InternPool.Nav.Index) !Symbol.Index { |
| 1931 | | const ip = &zcu.intern_pool; |
| 1932 | | const nav = ip.getNav(nav_index); |
| 1933 | | if (nav.getExtern(ip)) |@"extern"| return elf.globalSymbol(.{ |
| 1934 | | .name = @"extern".name.toSlice(ip), |
| 1935 | | .lib_name = @"extern".lib_name.toSlice(ip), |
| 1936 | | .type = navType(ip, nav.resolved.?, elf.base.comp.config.any_non_single_threaded), |
| 1937 | | .bind = switch (@"extern".linkage) { |
| 1938 | | .internal => .LOCAL, |
| 1939 | | .strong => .GLOBAL, |
| 1940 | | .weak => .WEAK, |
| 1941 | | .link_once => return error.LinkOnceUnsupported, |
| 1942 | | }, |
| 1943 | | .visibility = switch (@"extern".visibility) { |
| 1944 | | .default => .DEFAULT, |
| 1945 | | .hidden => .HIDDEN, |
| 1946 | | .protected => .PROTECTED, |
| 1947 | | }, |
| 1948 | | }); |
| 1949 | | const nmi = try elf.navMapIndex(zcu, nav_index); |
| 1950 | | return nmi.symbol(elf); |
| 1951 | | } |
| 1952 | 2833 | |
| 1953 | | fn uavMapIndex(elf: *Elf, uav_val: InternPool.Index) !Node.UavMapIndex { |
| 1954 | | const gpa = elf.base.comp.gpa; |
| 1955 | | try elf.symtab.ensureUnusedCapacity(gpa, 1); |
| 1956 | | const uav_gop = try elf.uavs.getOrPut(gpa, uav_val); |
| 1957 | | if (!uav_gop.found_existing) |
| 1958 | | uav_gop.value_ptr.* = try elf.initSymbolAssumeCapacity(.{ .type = .OBJECT }); |
| 1959 | | return @enumFromInt(uav_gop.index); |
| 1960 | | } |
| 1961 | | pub fn uavSymbol(elf: *Elf, uav_val: InternPool.Index) !Symbol.Index { |
| 1962 | | const umi = try elf.uavMapIndex(uav_val); |
| 1963 | | return umi.symbol(elf); |
| 2834 | try elf.ensureUnusedSymbolCapacity(1, .all_local); |
| 2835 | try elf.nodes.ensureUnusedCapacity(gpa, 1); |
| 2836 | try elf.navs.ensureUnusedCapacity(gpa, 1); |
| 2837 | |
| 2838 | const nav_gop = elf.navs.getOrPutAssumeCapacity(nav_index); |
| 2839 | const nmi: Node.NavMapIndex = @enumFromInt(nav_gop.index); |
| 2840 | if (!nav_gop.found_existing) { |
| 2841 | const sym_type = navType(ip, nav.resolved.?, elf.base.comp.config.any_non_single_threaded); |
| 2842 | const shndx: Section.Index = section: { |
| 2843 | if (nav.resolved.?.@"linksection".toSlice(ip)) |@"linksection"| { |
| 2844 | if (elf.namedSection(@"linksection")) |shndx| break :section shndx; |
| 2845 | } |
| 2846 | break :section switch (sym_type) { |
| 2847 | else => unreachable, |
| 2848 | .FUNC => .text, |
| 2849 | .OBJECT => .data, |
| 2850 | .TLS => elf.shndx.tdata, |
| 2851 | }; |
| 2852 | }; |
| 2853 | const alignment: InternPool.Alignment = switch (Type.fromInterned(nav.resolved.?.type).zigTypeTag(zcu)) { |
| 2854 | .@"fn" => a: { |
| 2855 | const mod = zcu.navFileScope(nav_index).mod.?; |
| 2856 | const target = &mod.resolved_target.result; |
| 2857 | const min = target_util.minFunctionAlignment(target); |
| 2858 | break :a switch (nav.resolved.?.@"align") { |
| 2859 | else => |a| a.maxStrict(min), |
| 2860 | .none => switch (mod.optimize_mode) { |
| 2861 | .Debug, |
| 2862 | .ReleaseSafe, |
| 2863 | .ReleaseFast, |
| 2864 | => target_util.defaultFunctionAlignment(target), |
| 2865 | .ReleaseSmall => min, |
| 2866 | }, |
| 2867 | }; |
| 2868 | }, |
| 2869 | else => switch (nav.resolved.?.@"align") { |
| 2870 | .none => Type.fromInterned(nav.resolved.?.type).abiAlignment(zcu), |
| 2871 | else => |a| a, |
| 2872 | }, |
| 2873 | }; |
| 2874 | const node = try elf.mf.addLastChildNode(gpa, shndx.get(elf).ni, .{ |
| 2875 | .alignment = alignment.toStdMem(), |
| 2876 | }); |
| 2877 | nav_gop.value_ptr.* = .{ |
| 2878 | .lsi = elf.addLocalSymbolAssumeCapacity(.{ |
| 2879 | .node = node, |
| 2880 | .name = try elf.string(.strtab, nav.fqn.toSlice(ip)), |
| 2881 | .value = 0, |
| 2882 | .size = 0, |
| 2883 | .type = sym_type, |
| 2884 | .shndx = shndx, |
| 2885 | }), |
| 2886 | .first_reloc = .none, |
| 2887 | }; |
| 2888 | elf.nodes.appendAssumeCapacity(.{ .nav = nmi }); |
| 2889 | } |
| 2890 | return nmi; |
| 1964 | 2891 | } |
| 1965 | 2892 | |
| 1966 | | pub fn lazySymbol(elf: *Elf, lazy: link.File.LazySymbol) !Symbol.Index { |
| 2893 | fn uavMapIndex( |
| 2894 | elf: *Elf, |
| 2895 | uav_val: InternPool.Index, |
| 2896 | uav_align: InternPool.Alignment, |
| 2897 | ) !Node.UavMapIndex { |
| 1967 | 2898 | const gpa = elf.base.comp.gpa; |
| 1968 | | try elf.symtab.ensureUnusedCapacity(gpa, 1); |
| 1969 | | const lazy_gop = try elf.lazy.getPtr(lazy.kind).map.getOrPut(gpa, lazy.ty); |
| 1970 | | if (!lazy_gop.found_existing) { |
| 1971 | | lazy_gop.value_ptr.* = try elf.initSymbolAssumeCapacity(.{ |
| 1972 | | .type = switch (lazy.kind) { |
| 1973 | | .code => .FUNC, |
| 1974 | | .const_data => .OBJECT, |
| 1975 | | }, |
| 2899 | const zcu = elf.base.comp.zcu.?; |
| 2900 | |
| 2901 | try elf.ensureUnusedSymbolCapacity(1, .all_local); |
| 2902 | try elf.nodes.ensureUnusedCapacity(gpa, 1); |
| 2903 | try elf.uavs.ensureUnusedCapacity(gpa, 1); |
| 2904 | try elf.pending_uavs.ensureUnusedCapacity(gpa, 1); |
| 2905 | |
| 2906 | const abi_align = Value.fromInterned(uav_val).typeOf(zcu).abiAlignment(zcu); |
| 2907 | const resolved_align: InternPool.Alignment = switch (uav_align) { |
| 2908 | .none => abi_align, |
| 2909 | else => |a| a.minStrict(abi_align), |
| 2910 | }; |
| 2911 | |
| 2912 | const uav_gop = elf.uavs.getOrPutAssumeCapacity(uav_val); |
| 2913 | const umi: Node.UavMapIndex = @enumFromInt(uav_gop.index); |
| 2914 | if (!uav_gop.found_existing) { |
| 2915 | const shndx: Section.Index = .data; |
| 2916 | const node = try elf.mf.addLastChildNode(gpa, shndx.get(elf).ni, .{ |
| 2917 | .moved = true, // see assert at end of `flushUav` |
| 2918 | .alignment = resolved_align.toStdMem(), |
| 1976 | 2919 | }); |
| 1977 | | elf.synth_prog_node.increaseEstimatedTotalItems(1); |
| 2920 | var name_buf: [32]u8 = undefined; |
| 2921 | const name = std.fmt.bufPrint( |
| 2922 | &name_buf, |
| 2923 | "__anon_{d}", |
| 2924 | .{@intFromEnum(uav_val)}, |
| 2925 | ) catch unreachable; |
| 2926 | uav_gop.value_ptr.* = .{ |
| 2927 | .lsi = elf.addLocalSymbolAssumeCapacity(.{ |
| 2928 | .node = node, |
| 2929 | .name = try elf.string(.strtab, name), |
| 2930 | .value = 0, |
| 2931 | .size = 0, |
| 2932 | .type = .OBJECT, |
| 2933 | .shndx = shndx, |
| 2934 | }), |
| 2935 | .first_reloc = .none, |
| 2936 | }; |
| 2937 | elf.nodes.appendAssumeCapacity(.{ .uav = umi }); |
| 2938 | elf.const_prog_node.increaseEstimatedTotalItems(1); |
| 2939 | elf.pending_uavs.appendAssumeCapacity(umi); |
| 2940 | } else { |
| 2941 | const node = uav_gop.value_ptr.lsi.index().ptr(elf).node; |
| 2942 | if (resolved_align.toStdMem().order(node.alignment(&elf.mf)).compare(.gt)) { |
| 2943 | node.realign(&elf.mf, resolved_align.toStdMem()); |
| 2944 | } |
| 1978 | 2945 | } |
| 1979 | | return lazy_gop.value_ptr.*; |
| 2946 | return umi; |
| 1980 | 2947 | } |
| 1981 | 2948 | |
| 1982 | 2949 | pub fn loadInput(elf: *Elf, input: link.Input) (Io.File.Reader.SizeError || |
| ... | ... | @@ -2081,22 +3048,23 @@ fn loadObject( |
| 2081 | 3048 | const diags = &comp.link_diags; |
| 2082 | 3049 | const r = &fr.interface; |
| 2083 | 3050 | |
| 2084 | | const ii: Node.InputIndex = @enumFromInt(elf.inputs.items.len); |
| 3051 | const input_index: Node.InputIndex = @enumFromInt(elf.inputs.items.len); |
| 2085 | 3052 | log.debug("loadObject({f}{f})", .{ path.fmtEscapeString(), fmtMemberString(member) }); |
| 2086 | | const ident = try r.peek(std.elf.EI.OSABI); |
| 2087 | | if (!std.mem.eql(u8, ident[0..std.elf.MAGIC.len], std.elf.MAGIC)) return error.BadMagic; |
| 2088 | | if (!std.mem.eql(u8, ident[std.elf.MAGIC.len..], elf.mf.memory_map.memory[std.elf.MAGIC.len..ident.len])) |
| 2089 | | return diags.failParse(path, "bad ident", .{}); |
| 2090 | | try elf.symtab.ensureUnusedCapacity(gpa, 1); |
| 3053 | try elf.checkInputIdent(path, r); |
| 3054 | try elf.ensureUnusedSymbolCapacity(1, .all_local); |
| 2091 | 3055 | try elf.inputs.ensureUnusedCapacity(gpa, 1); |
| 3056 | const file_symbol = elf.addLocalSymbolAssumeCapacity(.{ |
| 3057 | .node = .none, |
| 3058 | .name = try elf.string(.strtab, std.fs.path.stem(member orelse path.sub_path)), |
| 3059 | .value = 0, |
| 3060 | .size = 0, |
| 3061 | .type = .FILE, |
| 3062 | .shndx = .ABS, |
| 3063 | }); |
| 2092 | 3064 | elf.inputs.addOneAssumeCapacity().* = .{ |
| 2093 | 3065 | .path = path, |
| 2094 | 3066 | .member = if (member) |m| try gpa.dupe(u8, m) else null, |
| 2095 | | .si = try elf.initSymbolAssumeCapacity(.{ |
| 2096 | | .name = std.fs.path.stem(member orelse path.sub_path), |
| 2097 | | .type = .FILE, |
| 2098 | | .shndx = .ABS, |
| 2099 | | }), |
| 3067 | .file_symbol = file_symbol, |
| 2100 | 3068 | }; |
| 2101 | 3069 | const target_endian = elf.targetEndian(); |
| 2102 | 3070 | switch (elf.identClass()) { |
| ... | ... | @@ -2108,17 +3076,17 @@ fn loadObject( |
| 2108 | 3076 | if (ehdr.machine != elf.ehdrField(.machine)) |
| 2109 | 3077 | return diags.failParse(path, "bad machine", .{}); |
| 2110 | 3078 | if (ehdr.shoff == 0 or ehdr.shnum <= 1) return; |
| 2111 | | if (ehdr.shoff + ehdr.shentsize * ehdr.shnum > fl.size) |
| 3079 | if (ehdr.shoff + @as(u64, ehdr.shentsize) * @as(u64, ehdr.shnum) > fl.size) |
| 2112 | 3080 | return diags.failParse(path, "bad section header location", .{}); |
| 2113 | 3081 | if (ehdr.shentsize < @sizeOf(ElfN.Shdr)) |
| 2114 | 3082 | return diags.failParse(path, "unsupported shentsize", .{}); |
| 2115 | | const sections = try gpa.alloc(struct { shdr: ElfN.Shdr, si: Symbol.Index }, ehdr.shnum); |
| 3083 | const sections = try gpa.alloc(struct { shdr: ElfN.Shdr, isi: ?InputSection.Index }, ehdr.shnum); |
| 2116 | 3084 | defer gpa.free(sections); |
| 2117 | 3085 | try fr.seekTo(fl.offset + ehdr.shoff); |
| 2118 | 3086 | for (sections) |*section| { |
| 2119 | 3087 | section.* = .{ |
| 2120 | 3088 | .shdr = try r.peekStruct(ElfN.Shdr, target_endian), |
| 2121 | | .si = .null, |
| 3089 | .isi = null, |
| 2122 | 3090 | }; |
| 2123 | 3091 | try r.discardAll(ehdr.shentsize); |
| 2124 | 3092 | switch (section.shdr.type) { |
| ... | ... | @@ -2140,42 +3108,49 @@ fn loadObject( |
| 2140 | 3108 | }; |
| 2141 | 3109 | defer gpa.free(shstrtab); |
| 2142 | 3110 | try elf.nodes.ensureUnusedCapacity(gpa, ehdr.shnum - 1); |
| 2143 | | try elf.symtab.ensureUnusedCapacity(gpa, ehdr.shnum - 1); |
| 2144 | 3111 | try elf.input_sections.ensureUnusedCapacity(gpa, ehdr.shnum - 1); |
| 2145 | 3112 | for (sections[1..]) |*section| switch (section.shdr.type) { |
| 2146 | 3113 | else => {}, |
| 2147 | 3114 | .PROGBITS, .NOBITS => { |
| 2148 | 3115 | if (section.shdr.name >= shstrtab.len) continue; |
| 2149 | 3116 | const name = std.mem.sliceTo(shstrtab[section.shdr.name..], 0); |
| 2150 | | const parent_si = elf.namedSection(name) orelse continue; |
| 2151 | | const ni = try elf.mf.addLastChildNode(gpa, parent_si.node(elf), .{ |
| 3117 | const shndx: Section.Index = elf.namedSection(name) orelse shndx: { |
| 3118 | // TODO: actually generate a .bss section. For now, just throw it into `.data`. |
| 3119 | if (std.mem.eql(u8, name, ".bss") or |
| 3120 | std.mem.startsWith(u8, name, ".bss.")) break :shndx .data; |
| 3121 | if (std.mem.eql(u8, name, ".tbss") or |
| 3122 | std.mem.startsWith(u8, name, ".tbss.")) break :shndx elf.shndx.tdata; |
| 3123 | break :shndx .UNDEF; |
| 3124 | }; |
| 3125 | if (shndx == .UNDEF) continue; |
| 3126 | const ni = try elf.mf.addLastChildNode(gpa, shndx.get(elf).ni, .{ |
| 2152 | 3127 | .size = section.shdr.size, |
| 2153 | 3128 | .alignment = .fromByteUnits(std.math.ceilPowerOfTwoAssert( |
| 2154 | 3129 | usize, |
| 2155 | 3130 | @intCast(@max(section.shdr.addralign, 1)), |
| 2156 | 3131 | )), |
| 2157 | | .moved = true, |
| 3132 | .moved = true, // see assert at end of `flushInputSection` |
| 2158 | 3133 | }); |
| 2159 | 3134 | elf.nodes.appendAssumeCapacity(.{ |
| 2160 | 3135 | .input_section = @enumFromInt(elf.input_sections.items.len), |
| 2161 | 3136 | }); |
| 2162 | | section.si = try elf.initSymbolAssumeCapacity(.{ |
| 2163 | | .type = .SECTION, |
| 2164 | | .shndx = parent_si.shndx(elf), |
| 2165 | | }); |
| 2166 | | section.si.get(elf).ni = ni; |
| 3137 | section.isi = @enumFromInt(elf.input_sections.items.len); |
| 2167 | 3138 | elf.input_sections.addOneAssumeCapacity().* = .{ |
| 2168 | | .ii = ii, |
| 2169 | | .si = section.si, |
| 3139 | .input = input_index, |
| 2170 | 3140 | .file_location = .{ |
| 2171 | 3141 | .offset = fl.offset + section.shdr.offset, |
| 2172 | | .size = section.shdr.size, |
| 3142 | .size = if (section.shdr.type == .NOBITS) 0 else section.shdr.size, |
| 2173 | 3143 | }, |
| 3144 | // The section vaddr is initially 0, because the symbol addresses are |
| 3145 | // zero-based. This will eventually be updated by `flushMoved`. |
| 3146 | .vaddr = 0, |
| 3147 | .node = ni, |
| 3148 | .first_reloc = .none, |
| 2174 | 3149 | }; |
| 2175 | 3150 | elf.synth_prog_node.increaseEstimatedTotalItems(1); |
| 2176 | 3151 | }, |
| 2177 | 3152 | }; |
| 2178 | | var symmap: std.ArrayList(Symbol.Index) = .empty; |
| 3153 | var symmap: std.ArrayList(Symbol.Id) = .empty; |
| 2179 | 3154 | defer symmap.deinit(gpa); |
| 2180 | 3155 | for (sections[1..], 1..) |*symtab, symtab_shndx| switch (symtab.shdr.type) { |
| 2181 | 3156 | else => {}, |
| ... | ... | @@ -2206,105 +3181,132 @@ fn loadObject( |
| 2206 | 3181 | ), 1) catch continue; |
| 2207 | 3182 | symmap.clearRetainingCapacity(); |
| 2208 | 3183 | try symmap.resize(gpa, symnum); |
| 2209 | | try elf.symtab.ensureUnusedCapacity(gpa, symnum); |
| 2210 | | try elf.globals.ensureUnusedCapacity(gpa, symnum); |
| 3184 | try elf.ensureUnusedSymbolCapacity(symnum, .maybe_global); |
| 2211 | 3185 | try fr.seekTo(fl.offset + symtab.shdr.offset + symtab.shdr.entsize); |
| 2212 | 3186 | for (symmap.items) |*si| { |
| 2213 | 3187 | si.* = .null; |
| 2214 | 3188 | const input_sym = try r.peekStruct(ElfN.Sym, target_endian); |
| 2215 | 3189 | try r.discardAll64(symtab.shdr.entsize); |
| 2216 | | if (input_sym.name >= strtab.len or input_sym.shndx == std.elf.SHN_UNDEF or |
| 2217 | | input_sym.shndx >= ehdr.shnum) continue; |
| 2218 | | switch (input_sym.info.type) { |
| 2219 | | .NOTYPE, .OBJECT, .FUNC => {}, |
| 2220 | | .SECTION => { |
| 2221 | | const section = §ions[input_sym.shndx]; |
| 2222 | | if (input_sym.value == section.shdr.addr) si.* = section.si; |
| 3190 | if (input_sym.name >= strtab.len or input_sym.shndx >= ehdr.shnum) continue; |
| 3191 | |
| 3192 | const name = std.mem.sliceTo(strtab[input_sym.name..], 0); |
| 3193 | |
| 3194 | const sym_type: std.elf.STT = switch (input_sym.info.type) { |
| 3195 | .NOTYPE, .OBJECT, .FUNC, .TLS => |t| t, |
| 3196 | .SECTION => .NOTYPE, |
| 3197 | .FILE, .COMMON, _ => continue, |
| 3198 | }; |
| 3199 | |
| 3200 | if (input_sym.shndx == std.elf.SHN_UNDEF) switch (input_sym.info.bind) { |
| 3201 | _ => |bind| return diags.failParse( |
| 3202 | path, |
| 3203 | "symbol '{s}' has unsupported binding (0x{x})", |
| 3204 | .{ name, bind }, |
| 3205 | ), |
| 3206 | .LOCAL => continue, |
| 3207 | .GLOBAL, .WEAK => |bind| { |
| 3208 | si.* = elf.addGlobalSymbolAssumeCapacity(.{ |
| 3209 | .node = .none, |
| 3210 | .name = try .string(elf, name), |
| 3211 | .value = input_sym.value, |
| 3212 | .size = input_sym.size, |
| 3213 | .type = sym_type, |
| 3214 | .bind = if (bind == .WEAK) .weak else .strong, |
| 3215 | .visibility = input_sym.other.visibility, |
| 3216 | .shndx = .UNDEF, |
| 3217 | }) catch |err| switch (err) { |
| 3218 | error.MultipleDefinitions => unreachable, // shndx is .UNDEF |
| 3219 | }; |
| 2223 | 3220 | continue; |
| 2224 | 3221 | }, |
| 2225 | | else => continue, |
| 2226 | | } |
| 2227 | | const name = std.mem.sliceTo(strtab[input_sym.name..], 0); |
| 2228 | | const parent_si = sections[input_sym.shndx].si; |
| 2229 | | si.* = try elf.initSymbolAssumeCapacity(.{ |
| 2230 | | .name = name, |
| 2231 | | .value = input_sym.value, |
| 2232 | | .size = input_sym.size, |
| 2233 | | .type = input_sym.info.type, |
| 2234 | | .bind = input_sym.info.bind, |
| 2235 | | .visibility = input_sym.other.visibility, |
| 2236 | | .shndx = parent_si.shndx(elf), |
| 2237 | | }); |
| 2238 | | si.get(elf).ni = parent_si.get(elf).ni; |
| 3222 | }; |
| 3223 | |
| 3224 | const input_section_node = (sections[input_sym.shndx].isi orelse continue).node(elf); |
| 3225 | |
| 2239 | 3226 | switch (input_sym.info.bind) { |
| 2240 | | else => {}, |
| 2241 | | .GLOBAL => { |
| 2242 | | const gop = elf.globals.getOrPutAssumeCapacity(elf.targetLoad( |
| 2243 | | &@field(elf.symPtr(si.*), @tagName(class)).name, |
| 2244 | | )); |
| 2245 | | if (gop.found_existing) switch (elf.targetLoad( |
| 2246 | | switch (elf.symPtr(gop.value_ptr.*)) { |
| 2247 | | inline else => |sym| &sym.info, |
| 2248 | | }, |
| 2249 | | ).bind) { |
| 2250 | | else => unreachable, |
| 2251 | | .GLOBAL => return diags.failParse( |
| 3227 | _ => |bind| return diags.failParse( |
| 3228 | path, |
| 3229 | "symbol '{s}' has unsupported binding (0x{x})", |
| 3230 | .{ name, bind }, |
| 3231 | ), |
| 3232 | .LOCAL => { |
| 3233 | const lsi = elf.addLocalSymbolAssumeCapacity(.{ |
| 3234 | .node = input_section_node, |
| 3235 | .name = try elf.string(.strtab, name), |
| 3236 | .value = input_sym.value, |
| 3237 | .size = input_sym.size, |
| 3238 | .type = sym_type, |
| 3239 | .shndx = elf.getNodeShndx(input_section_node), |
| 3240 | }); |
| 3241 | si.* = .local(lsi); |
| 3242 | }, |
| 3243 | .GLOBAL, .WEAK => |bind| { |
| 3244 | si.* = elf.addGlobalSymbolAssumeCapacity(.{ |
| 3245 | .node = input_section_node, |
| 3246 | .name = try .string(elf, name), |
| 3247 | .value = input_sym.value, |
| 3248 | .size = input_sym.size, |
| 3249 | .type = sym_type, |
| 3250 | .bind = if (bind == .WEAK) .weak else .strong, |
| 3251 | .visibility = input_sym.other.visibility, |
| 3252 | .shndx = elf.getNodeShndx(input_section_node), |
| 3253 | }) catch |err| switch (err) { |
| 3254 | error.MultipleDefinitions => return diags.failParse( |
| 2252 | 3255 | path, |
| 2253 | 3256 | "multiple definitions of '{s}'", |
| 2254 | 3257 | .{name}, |
| 2255 | 3258 | ), |
| 2256 | | .WEAK => {}, |
| 2257 | 3259 | }; |
| 2258 | | gop.value_ptr.* = si.*; |
| 2259 | | }, |
| 2260 | | .WEAK => { |
| 2261 | | const gop = elf.globals.getOrPutAssumeCapacity(elf.targetLoad( |
| 2262 | | &@field(elf.symPtr(si.*), @tagName(class)).name, |
| 2263 | | )); |
| 2264 | | if (!gop.found_existing) gop.value_ptr.* = si.*; |
| 2265 | 3260 | }, |
| 2266 | 3261 | } |
| 2267 | 3262 | } |
| 2268 | | for (sections[1..]) |*rels| switch (rels.shdr.type) { |
| 3263 | for (sections[1..]) |*rel_sec| switch (rel_sec.shdr.type) { |
| 2269 | 3264 | else => {}, |
| 2270 | 3265 | inline .REL, .RELA => |sht| { |
| 2271 | | if (rels.shdr.link != symtab_shndx or rels.shdr.info == std.elf.SHN_UNDEF or |
| 2272 | | rels.shdr.info >= ehdr.shnum) continue; |
| 3266 | if (rel_sec.shdr.link != symtab_shndx or rel_sec.shdr.info == std.elf.SHN_UNDEF or |
| 3267 | rel_sec.shdr.info >= ehdr.shnum) continue; |
| 2273 | 3268 | const Rel = switch (sht) { |
| 2274 | 3269 | else => comptime unreachable, |
| 2275 | 3270 | .REL => ElfN.Rel, |
| 2276 | 3271 | .RELA => ElfN.Rela, |
| 2277 | 3272 | }; |
| 2278 | | if (rels.shdr.entsize < @sizeOf(Rel)) |
| 3273 | if (rel_sec.shdr.entsize < @sizeOf(Rel)) |
| 2279 | 3274 | return diags.failParse(path, "unsupported rel entsize", .{}); |
| 2280 | 3275 | |
| 2281 | | const loc_sec = §ions[rels.shdr.info]; |
| 2282 | | if (loc_sec.si == .null) continue; |
| 2283 | | const loc_sym = loc_sec.si.get(elf); |
| 2284 | | assert(loc_sym.loc_relocs == .none); |
| 2285 | | loc_sym.loc_relocs = @enumFromInt(elf.relocs.items.len); |
| 3276 | const loc_sec = §ions[rel_sec.shdr.info]; |
| 3277 | const loc_node = (loc_sec.isi orelse continue).node(elf); |
| 3278 | elf.resetNodeRelocs(loc_node); |
| 2286 | 3279 | |
| 2287 | 3280 | const relnum = std.math.divExact( |
| 2288 | 3281 | u32, |
| 2289 | | @intCast(rels.shdr.size), |
| 2290 | | @intCast(rels.shdr.entsize), |
| 3282 | @intCast(rel_sec.shdr.size), |
| 3283 | @intCast(rel_sec.shdr.entsize), |
| 2291 | 3284 | ) catch return diags.failParse( |
| 2292 | 3285 | path, |
| 2293 | 3286 | "relocation section size (0x{x}) is not a multiple of entsize (0x{x})", |
| 2294 | | .{ rels.shdr.size, rels.shdr.entsize }, |
| 3287 | .{ rel_sec.shdr.size, rel_sec.shdr.entsize }, |
| 2295 | 3288 | ); |
| 2296 | | try elf.ensureUnusedRelocCapacity(loc_sec.si, relnum); |
| 2297 | | try fr.seekTo(fl.offset + rels.shdr.offset); |
| 3289 | try elf.ensureUnusedRelocCapacity(loc_node, relnum); |
| 3290 | try fr.seekTo(fl.offset + rel_sec.shdr.offset); |
| 2298 | 3291 | for (0..relnum) |_| { |
| 2299 | 3292 | const rel = try r.peekStruct(Rel, target_endian); |
| 2300 | | try r.discardAll64(rels.shdr.entsize); |
| 2301 | | if (rel.info.sym == 0 or rel.info.sym > symnum) continue; |
| 2302 | | const target_si = symmap.items[rel.info.sym - 1]; |
| 2303 | | if (target_si == .null) continue; |
| 3293 | try r.discardAll64(rel_sec.shdr.entsize); |
| 3294 | if (rel.info.sym == 0) continue; |
| 3295 | if (rel.info.sym > symnum) return diags.failParse( |
| 3296 | path, |
| 3297 | "relocation target symbol index {d} exceeds symtab size", |
| 3298 | .{rel.info.sym}, |
| 3299 | ); |
| 3300 | const target = symmap.items[rel.info.sym - 1]; |
| 3301 | if (target == Symbol.Id.null) return diags.failParse( |
| 3302 | path, |
| 3303 | "unsupported symbol at index {d} required for relocation", |
| 3304 | .{rel.info.sym}, |
| 3305 | ); |
| 2304 | 3306 | elf.addRelocAssumeCapacity( |
| 2305 | | loc_sec.si, |
| 3307 | loc_node, |
| 2306 | 3308 | rel.offset - loc_sec.shdr.addr, |
| 2307 | | target_si, |
| 3309 | target, |
| 2308 | 3310 | rel.addend, |
| 2309 | 3311 | .wrap(rel.info.type, elf), |
| 2310 | 3312 | ); |
| ... | ... | @@ -2322,10 +3324,7 @@ fn loadDso(elf: *Elf, path: std.Build.Cache.Path, fr: *Io.File.Reader) !void { |
| 2322 | 3324 | const r = &fr.interface; |
| 2323 | 3325 | |
| 2324 | 3326 | log.debug("loadDso({f})", .{path.fmtEscapeString()}); |
| 2325 | | const ident = try r.peek(std.elf.EI.NIDENT); |
| 2326 | | if (!std.mem.eql(u8, ident[0..std.elf.MAGIC.len], std.elf.MAGIC)) return error.BadMagic; |
| 2327 | | if (!std.mem.eql(u8, ident[std.elf.MAGIC.len..], elf.mf.memory_map.memory[std.elf.MAGIC.len..ident.len])) |
| 2328 | | return diags.failParse(path, "bad ident", .{}); |
| 3327 | try elf.checkInputIdent(path, r); |
| 2329 | 3328 | const target_endian = elf.targetEndian(); |
| 2330 | 3329 | switch (elf.identClass()) { |
| 2331 | 3330 | .NONE, _ => unreachable, |
| ... | ... | @@ -2393,7 +3392,62 @@ fn loadDso(elf: *Elf, path: std.Build.Cache.Path, fr: *Io.File.Reader) !void { |
| 2393 | 3392 | } |
| 2394 | 3393 | fn loadDsoExact(elf: *Elf, name: []const u8) !void { |
| 2395 | 3394 | log.debug("loadDsoExact({f})", .{std.zig.fmtString(name)}); |
| 2396 | | try elf.needed.put(elf.base.comp.gpa, try elf.string(.dynstr, name), {}); |
| 3395 | if (elf.shndx.dynamic != .UNDEF) { |
| 3396 | try elf.needed.put(elf.base.comp.gpa, try elf.string(.dynstr, name), {}); |
| 3397 | } |
| 3398 | } |
| 3399 | |
| 3400 | /// Validates that the `std.elf.Ident` present at the start of `r` is a compatible link input. |
| 3401 | /// |
| 3402 | /// Returns an error if it is incompatible, or if the ident is broken or missing. |
| 3403 | /// |
| 3404 | /// Does not advance the position of `r`. Requires `r` to have a 16-byte buffer. |
| 3405 | fn checkInputIdent( |
| 3406 | elf: *const Elf, |
| 3407 | path: std.Build.Cache.Path, |
| 3408 | r: *Io.Reader, |
| 3409 | ) !void { |
| 3410 | const diags = &elf.base.comp.link_diags; |
| 3411 | |
| 3412 | const ident = try r.peekStructPointer(std.elf.Ident); |
| 3413 | const target: *const std.elf.Ident = @ptrCast(elf.mf.memory_map.memory[0..@sizeOf(std.elf.Ident)]); |
| 3414 | |
| 3415 | if (!std.mem.eql(u8, &ident.magic, std.elf.MAGIC)) { |
| 3416 | return error.BadMagic; |
| 3417 | } |
| 3418 | |
| 3419 | if (ident.class != target.class) return diags.failParse( |
| 3420 | path, |
| 3421 | "bad ELF class ({?s})", |
| 3422 | .{std.enums.tagName(std.elf.CLASS, ident.class)}, |
| 3423 | ); |
| 3424 | if (ident.data != target.data) return diags.failParse( |
| 3425 | path, |
| 3426 | "bad ELF data encoding ({?s})", |
| 3427 | .{std.enums.tagName(std.elf.DATA, ident.data)}, |
| 3428 | ); |
| 3429 | if (ident.version != target.version) return diags.failParse( |
| 3430 | path, |
| 3431 | "bad ELF version ({d})", |
| 3432 | .{ident.version}, |
| 3433 | ); |
| 3434 | |
| 3435 | // OSABI is a bit more complex. On Linux, `.NONE` and `.GNU` are both valid and both common. |
| 3436 | // It sounds reasonable to allow the value we chose *and* allow `.NONE`. |
| 3437 | const expect_abiversion: u8 = abiver: { |
| 3438 | if (ident.osabi == .NONE) break :abiver 0; |
| 3439 | if (ident.osabi == target.osabi) break :abiver target.abiversion; |
| 3440 | return diags.failParse( |
| 3441 | path, |
| 3442 | "bad ELF OS/ABI ({?s})", |
| 3443 | .{std.enums.tagName(std.elf.OSABI, ident.osabi)}, |
| 3444 | ); |
| 3445 | }; |
| 3446 | if (ident.abiversion != expect_abiversion) return diags.failParse( |
| 3447 | path, |
| 3448 | "bad ELF ABI version ({d})", |
| 3449 | .{ident.abiversion}, |
| 3450 | ); |
| 2397 | 3451 | } |
| 2398 | 3452 | |
| 2399 | 3453 | pub fn prelink(elf: *Elf, prog_node: std.Progress.Node) !void { |
| ... | ... | @@ -2406,20 +3460,27 @@ pub fn prelink(elf: *Elf, prog_node: std.Progress.Node) !void { |
| 2406 | 3460 | fn prelinkInner(elf: *Elf) !void { |
| 2407 | 3461 | const comp = elf.base.comp; |
| 2408 | 3462 | const gpa = comp.gpa; |
| 2409 | | try elf.symtab.ensureUnusedCapacity(gpa, 1); |
| 3463 | try elf.ensureUnusedSymbolCapacity(1, .all_local); |
| 2410 | 3464 | try elf.inputs.ensureUnusedCapacity(gpa, 1); |
| 2411 | 3465 | const zcu_name = try std.fmt.allocPrint(gpa, "{s}_zcu", .{ |
| 2412 | 3466 | std.fs.path.stem(elf.base.emit.sub_path), |
| 2413 | 3467 | }); |
| 2414 | 3468 | defer gpa.free(zcu_name); |
| 2415 | | const si = try elf.initSymbolAssumeCapacity(.{ .name = zcu_name, .type = .FILE, .shndx = .ABS }); |
| 3469 | const zcu_file_symbol = elf.addLocalSymbolAssumeCapacity(.{ |
| 3470 | .node = .none, |
| 3471 | .name = try elf.string(.strtab, zcu_name), |
| 3472 | .value = 0, |
| 3473 | .size = 0, |
| 3474 | .type = .FILE, |
| 3475 | .shndx = .ABS, |
| 3476 | }); |
| 2416 | 3477 | elf.inputs.addOneAssumeCapacity().* = .{ |
| 2417 | 3478 | .path = elf.base.emit, |
| 2418 | 3479 | .member = null, |
| 2419 | | .si = si, |
| 3480 | .file_symbol = zcu_file_symbol, |
| 2420 | 3481 | }; |
| 2421 | 3482 | |
| 2422 | | if (elf.si.dynamic != .null) switch (elf.identClass()) { |
| 3483 | if (elf.shndx.dynamic != .UNDEF) switch (elf.identClass()) { |
| 2423 | 3484 | .NONE, _ => unreachable, |
| 2424 | 3485 | inline else => |ct_class| { |
| 2425 | 3486 | const ElfN = ct_class.ElfN(); |
| ... | ... | @@ -2430,9 +3491,9 @@ fn prelinkInner(elf: *Elf) !void { |
| 2430 | 3491 | @intFromBool(flags != 0) + @intFromBool(flags_1 != 0) + |
| 2431 | 3492 | @intFromBool(comp.config.output_mode == .Exe) + 12; |
| 2432 | 3493 | const dynamic_size: u32 = @intCast(@sizeOf(ElfN.Addr) * 2 * dynamic_len); |
| 2433 | | const dynamic_ni = elf.si.dynamic.node(elf); |
| 3494 | const dynamic_ni = elf.shndx.dynamic.get(elf).ni; |
| 2434 | 3495 | try dynamic_ni.resize(&elf.mf, gpa, dynamic_size); |
| 2435 | | switch (elf.shdrPtr(elf.si.dynamic.shndx(elf))) { |
| 3496 | switch (elf.shdrPtr(elf.shndx.dynamic)) { |
| 2436 | 3497 | inline else => |shdr| elf.targetStore(&shdr.size, dynamic_size), |
| 2437 | 3498 | } |
| 2438 | 3499 | const sec_dynamic = dynamic_ni.slice(&elf.mf); |
| ... | ... | @@ -2441,10 +3502,10 @@ fn prelinkInner(elf: *Elf) !void { |
| 2441 | 3502 | for ( |
| 2442 | 3503 | dynamic_entries[dynamic_index..][0..needed_len], |
| 2443 | 3504 | elf.needed.keys(), |
| 2444 | | ) |*dynamic_entry, needed| dynamic_entry.* = .{ std.elf.DT_NEEDED, needed }; |
| 3505 | ) |*dynamic_entry, needed| dynamic_entry.* = .{ std.elf.DT_NEEDED, @intFromEnum(needed) }; |
| 2445 | 3506 | dynamic_index += needed_len; |
| 2446 | 3507 | if (elf.options.soname) |soname| { |
| 2447 | | dynamic_entries[dynamic_index] = .{ std.elf.DT_SONAME, try elf.string(.dynstr, soname) }; |
| 3508 | dynamic_entries[dynamic_index] = .{ std.elf.DT_SONAME, @intFromEnum(try elf.string(.dynstr, soname)) }; |
| 2448 | 3509 | dynamic_index += 1; |
| 2449 | 3510 | } |
| 2450 | 3511 | if (flags != 0) { |
| ... | ... | @@ -2459,25 +3520,25 @@ fn prelinkInner(elf: *Elf) !void { |
| 2459 | 3520 | dynamic_entries[dynamic_index] = .{ std.elf.DT_DEBUG, 0 }; |
| 2460 | 3521 | dynamic_index += 1; |
| 2461 | 3522 | } |
| 2462 | | const rela_dyn_si = elf.si.got.shndx(elf).get(elf).rela_si; |
| 2463 | | const rela_plt_si = elf.si.got_plt.shndx(elf).get(elf).rela_si; |
| 3523 | const rela_dyn_shndx = elf.shndx.got.get(elf).rela_shndx; |
| 3524 | const rela_plt_shndx = elf.shndx.got_plt.get(elf).rela_shndx; |
| 2464 | 3525 | dynamic_entries[dynamic_index..][0..12].* = .{ |
| 2465 | | .{ std.elf.DT_RELA, @intCast(elf.computeNodeVAddr(rela_dyn_si.node(elf))) }, |
| 3526 | .{ std.elf.DT_RELA, @intCast(elf.computeNodeVAddr(rela_dyn_shndx.get(elf).ni)) }, |
| 2466 | 3527 | .{ std.elf.DT_RELASZ, elf.targetLoad( |
| 2467 | | &@field(elf.shdrPtr(rela_dyn_si.shndx(elf)), @tagName(ct_class)).size, |
| 3528 | &@field(elf.shdrPtr(rela_dyn_shndx), @tagName(ct_class)).size, |
| 2468 | 3529 | ) }, |
| 2469 | 3530 | .{ std.elf.DT_RELAENT, @sizeOf(ElfN.Rela) }, |
| 2470 | | .{ std.elf.DT_JMPREL, @intCast(elf.computeNodeVAddr(rela_plt_si.node(elf))) }, |
| 3531 | .{ std.elf.DT_JMPREL, @intCast(elf.computeNodeVAddr(rela_plt_shndx.get(elf).ni)) }, |
| 2471 | 3532 | .{ std.elf.DT_PLTRELSZ, elf.targetLoad( |
| 2472 | | &@field(elf.shdrPtr(rela_plt_si.shndx(elf)), @tagName(ct_class)).size, |
| 3533 | &@field(elf.shdrPtr(rela_plt_shndx), @tagName(ct_class)).size, |
| 2473 | 3534 | ) }, |
| 2474 | | .{ std.elf.DT_PLTGOT, @intCast(elf.computeNodeVAddr(elf.si.got_plt.node(elf))) }, |
| 3535 | .{ std.elf.DT_PLTGOT, @intCast(elf.computeNodeVAddr(elf.shndx.got_plt.get(elf).ni)) }, |
| 2475 | 3536 | .{ std.elf.DT_PLTREL, std.elf.DT_RELA }, |
| 2476 | | .{ std.elf.DT_SYMTAB, @intCast(elf.computeNodeVAddr(elf.si.dynsym.node(elf))) }, |
| 3537 | .{ std.elf.DT_SYMTAB, @intCast(elf.computeNodeVAddr(elf.shndx.dynsym.get(elf).ni)) }, |
| 2477 | 3538 | .{ std.elf.DT_SYMENT, @sizeOf(ElfN.Sym) }, |
| 2478 | | .{ std.elf.DT_STRTAB, @intCast(elf.computeNodeVAddr(elf.si.dynstr.node(elf))) }, |
| 3539 | .{ std.elf.DT_STRTAB, @intCast(elf.computeNodeVAddr(elf.shndx.dynstr.get(elf).ni)) }, |
| 2479 | 3540 | .{ std.elf.DT_STRSZ, elf.targetLoad( |
| 2480 | | &@field(elf.shdrPtr(elf.si.dynstr.shndx(elf)), @tagName(ct_class)).size, |
| 3541 | &@field(elf.shdrPtr(elf.shndx.dynstr), @tagName(ct_class)).size, |
| 2481 | 3542 | ) }, |
| 2482 | 3543 | .{ std.elf.DT_NULL, 0 }, |
| 2483 | 3544 | }; |
| ... | ... | @@ -2486,42 +3547,40 @@ fn prelinkInner(elf: *Elf) !void { |
| 2486 | 3547 | if (elf.targetEndian() != native_endian) for (dynamic_entries) |*dynamic_entry| |
| 2487 | 3548 | std.mem.byteSwapAllFields(@TypeOf(dynamic_entry.*), dynamic_entry); |
| 2488 | 3549 | |
| 2489 | | const dynamic_sym = elf.si.dynamic.get(elf); |
| 2490 | | assert(dynamic_sym.loc_relocs == .none); |
| 2491 | | dynamic_sym.loc_relocs = @enumFromInt(elf.relocs.items.len); |
| 2492 | | try elf.ensureUnusedRelocCapacity(elf.si.dynamic, 5); |
| 3550 | elf.first_dynamic_reloc = @enumFromInt(elf.relocs.items.len); |
| 3551 | try elf.ensureUnusedRelocCapacity(dynamic_ni, 5); |
| 2493 | 3552 | elf.addRelocAssumeCapacity( |
| 2494 | | elf.si.dynamic, |
| 3553 | dynamic_ni, |
| 2495 | 3554 | @sizeOf(ElfN.Addr) * (2 * (dynamic_len - 12) + 1), |
| 2496 | | rela_dyn_si, |
| 3555 | .local(rela_dyn_shndx.get(elf).lsi), |
| 2497 | 3556 | 0, |
| 2498 | 3557 | .absAddr(elf), |
| 2499 | 3558 | ); |
| 2500 | 3559 | elf.addRelocAssumeCapacity( |
| 2501 | | elf.si.dynamic, |
| 3560 | dynamic_ni, |
| 2502 | 3561 | @sizeOf(ElfN.Addr) * (2 * (dynamic_len - 9) + 1), |
| 2503 | | rela_plt_si, |
| 3562 | .local(rela_plt_shndx.get(elf).lsi), |
| 2504 | 3563 | 0, |
| 2505 | 3564 | .absAddr(elf), |
| 2506 | 3565 | ); |
| 2507 | 3566 | elf.addRelocAssumeCapacity( |
| 2508 | | elf.si.dynamic, |
| 3567 | dynamic_ni, |
| 2509 | 3568 | @sizeOf(ElfN.Addr) * (2 * (dynamic_len - 7) + 1), |
| 2510 | | elf.si.got_plt, |
| 3569 | .local(elf.shndx.got_plt.get(elf).lsi), |
| 2511 | 3570 | 0, |
| 2512 | 3571 | .absAddr(elf), |
| 2513 | 3572 | ); |
| 2514 | 3573 | elf.addRelocAssumeCapacity( |
| 2515 | | elf.si.dynamic, |
| 3574 | dynamic_ni, |
| 2516 | 3575 | @sizeOf(ElfN.Addr) * (2 * (dynamic_len - 5) + 1), |
| 2517 | | elf.si.dynsym, |
| 3576 | .local(elf.shndx.dynsym.get(elf).lsi), |
| 2518 | 3577 | 0, |
| 2519 | 3578 | .absAddr(elf), |
| 2520 | 3579 | ); |
| 2521 | 3580 | elf.addRelocAssumeCapacity( |
| 2522 | | elf.si.dynamic, |
| 3581 | dynamic_ni, |
| 2523 | 3582 | @sizeOf(ElfN.Addr) * (2 * (dynamic_len - 3) + 1), |
| 2524 | | elf.si.dynstr, |
| 3583 | .local(elf.shndx.dynstr.get(elf).lsi), |
| 2525 | 3584 | 0, |
| 2526 | 3585 | .absAddr(elf), |
| 2527 | 3586 | ); |
| ... | ... | @@ -2529,36 +3588,6 @@ fn prelinkInner(elf: *Elf) !void { |
| 2529 | 3588 | }; |
| 2530 | 3589 | } |
| 2531 | 3590 | |
| 2532 | | pub fn getNavVAddr( |
| 2533 | | elf: *Elf, |
| 2534 | | pt: Zcu.PerThread, |
| 2535 | | nav: InternPool.Nav.Index, |
| 2536 | | reloc_info: link.File.RelocInfo, |
| 2537 | | ) !u64 { |
| 2538 | | return elf.getVAddr(reloc_info, try elf.navSymbol(pt.zcu, nav)); |
| 2539 | | } |
| 2540 | | |
| 2541 | | pub fn getUavVAddr( |
| 2542 | | elf: *Elf, |
| 2543 | | uav: InternPool.Index, |
| 2544 | | reloc_info: link.File.RelocInfo, |
| 2545 | | ) !u64 { |
| 2546 | | return elf.getVAddr(reloc_info, try elf.uavSymbol(uav)); |
| 2547 | | } |
| 2548 | | |
| 2549 | | pub fn getVAddr(elf: *Elf, reloc_info: link.File.RelocInfo, target_si: Symbol.Index) !u64 { |
| 2550 | | try elf.addReloc( |
| 2551 | | @enumFromInt(reloc_info.parent.atom_index), |
| 2552 | | reloc_info.offset, |
| 2553 | | target_si, |
| 2554 | | reloc_info.addend, |
| 2555 | | .absAddr(elf), |
| 2556 | | ); |
| 2557 | | return switch (elf.symPtr(target_si)) { |
| 2558 | | inline else => |sym| elf.targetLoad(&sym.value), |
| 2559 | | }; |
| 2560 | | } |
| 2561 | | |
| 2562 | 3591 | fn addSection(elf: *Elf, segment_ni: MappedFile.Node.Index, opts: struct { |
| 2563 | 3592 | name: []const u8 = "", |
| 2564 | 3593 | type: std.elf.SHT = .NULL, |
| ... | ... | @@ -2570,19 +3599,22 @@ fn addSection(elf: *Elf, segment_ni: MappedFile.Node.Index, opts: struct { |
| 2570 | 3599 | entsize: std.elf.Word = 0, |
| 2571 | 3600 | node_align: std.mem.Alignment = .@"1", |
| 2572 | 3601 | fixed: bool = false, |
| 2573 | | }) !Symbol.Index { |
| 3602 | }) !Section.Index { |
| 2574 | 3603 | switch (opts.type) { |
| 2575 | 3604 | .NULL => assert(opts.size == 0), |
| 2576 | 3605 | .PROGBITS => assert(opts.size > 0), |
| 2577 | 3606 | else => {}, |
| 2578 | 3607 | } |
| 3608 | if (opts.flags.ALLOC and elf.ehdrField(.type) != .REL) { |
| 3609 | assert(elf.getNode(segment_ni) == .segment); |
| 3610 | } |
| 2579 | 3611 | const gpa = elf.base.comp.gpa; |
| 2580 | 3612 | try elf.nodes.ensureUnusedCapacity(gpa, 1); |
| 2581 | 3613 | try elf.shdrs.ensureUnusedCapacity(gpa, 1); |
| 2582 | | try elf.symtab.ensureUnusedCapacity(gpa, 1); |
| 3614 | if (opts.flags.ALLOC) try elf.ensureUnusedSymbolCapacity(1, .all_local); |
| 2583 | 3615 | |
| 2584 | 3616 | const shstrtab_entry = try elf.string(.shstrtab, opts.name); |
| 2585 | | const shndx: Symbol.Index.Shndx, const new_shdr_size = shndx: switch (elf.ehdrPtr()) { |
| 3617 | const shndx: Section.Index, const new_shdr_size = shndx: switch (elf.ehdrPtr()) { |
| 2586 | 3618 | inline else => |ehdr, class| { |
| 2587 | 3619 | const shndx, const shnum = alloc_shndx: switch (elf.targetLoad(&ehdr.shnum)) { |
| 2588 | 3620 | 1...std.elf.SHN_LORESERVE - 2 => |shndx| { |
| ... | ... | @@ -2605,8 +3637,8 @@ fn addSection(elf: *Elf, segment_ni: MappedFile.Node.Index, opts: struct { |
| 2605 | 3637 | break :alloc_shndx .{ shndx, shnum }; |
| 2606 | 3638 | }, |
| 2607 | 3639 | }; |
| 2608 | | assert(shndx < @intFromEnum(Symbol.Index.Shndx.LORESERVE)); |
| 2609 | | break :shndx .{ @enumFromInt(shndx), elf.targetLoad(&ehdr.shentsize) * shnum }; |
| 3640 | assert(shndx < @intFromEnum(Section.Index.LORESERVE)); |
| 3641 | break :shndx .{ @enumFromInt(shndx), @as(u64, elf.targetLoad(&ehdr.shentsize)) * @as(u64, shnum) }; |
| 2610 | 3642 | }, |
| 2611 | 3643 | }; |
| 2612 | 3644 | _, const shdr_node_size = elf.ni.shdr.location(&elf.mf).resolve(&elf.mf); |
| ... | ... | @@ -2622,17 +3654,22 @@ fn addSection(elf: *Elf, segment_ni: MappedFile.Node.Index, opts: struct { |
| 2622 | 3654 | .fixed = opts.fixed, |
| 2623 | 3655 | .resized = opts.size > 0, |
| 2624 | 3656 | }); |
| 2625 | | const si = elf.addSymbolAssumeCapacity(); |
| 2626 | | elf.nodes.appendAssumeCapacity(.{ .section = si }); |
| 2627 | | elf.shdrs.appendAssumeCapacity(.{ .si = si, .rela_si = .null, .rela_free = .none }); |
| 2628 | | si.get(elf).ni = ni; |
| 2629 | 3657 | const addr = elf.computeNodeVAddr(ni); |
| 3658 | const lsi: Symbol.LocalIndex = if (opts.flags.ALLOC) elf.addLocalSymbolAssumeCapacity(.{ |
| 3659 | .node = ni, |
| 3660 | .name = .empty, |
| 3661 | .value = addr, |
| 3662 | .size = 0, |
| 3663 | .type = .SECTION, |
| 3664 | .shndx = shndx, |
| 3665 | }) else .null; |
| 3666 | elf.shdrs.appendAssumeCapacity(.{ .lsi = lsi, .ni = ni, .rela_shndx = .UNDEF, .rela_free = .none }); |
| 3667 | elf.nodes.appendAssumeCapacity(.{ .section = shndx }); |
| 2630 | 3668 | const offset = ni.fileLocation(&elf.mf, false).offset; |
| 2631 | | try si.init(elf, .{ .value = addr, .type = .SECTION, .shndx = shndx }); |
| 2632 | 3669 | switch (elf.shdrPtr(shndx)) { |
| 2633 | 3670 | inline else => |shdr, class| { |
| 2634 | 3671 | shdr.* = .{ |
| 2635 | | .name = shstrtab_entry, |
| 3672 | .name = @intFromEnum(shstrtab_entry), |
| 2636 | 3673 | .type = opts.type, |
| 2637 | 3674 | .flags = .{ .shf = opts.flags }, |
| 2638 | 3675 | .addr = @intCast(addr), |
| ... | ... | @@ -2646,63 +3683,31 @@ fn addSection(elf: *Elf, segment_ni: MappedFile.Node.Index, opts: struct { |
| 2646 | 3683 | if (elf.targetEndian() != native_endian) std.mem.byteSwapAllFields(class.ElfN().Shdr, shdr); |
| 2647 | 3684 | }, |
| 2648 | 3685 | } |
| 2649 | | return si; |
| 2650 | | } |
| 2651 | | |
| 2652 | | fn renameSection(elf: *Elf, si: Symbol.Index, name: []const u8) !void { |
| 2653 | | const shstrtab_entry = try elf.string(.shstrtab, name); |
| 2654 | | switch (elf.shdrPtr(si.shndx(elf))) { |
| 2655 | | inline else => |shdr| elf.targetStore(&shdr.name, shstrtab_entry), |
| 2656 | | } |
| 2657 | | } |
| 2658 | | |
| 2659 | | fn sectionName(elf: *Elf, si: Symbol.Index) [:0]const u8 { |
| 2660 | | const name = elf.si.shstrtab.node(elf).slice(&elf.mf)[switch (elf.shdrPtr(si.shndx(elf))) { |
| 2661 | | inline else => |shdr| elf.targetLoad(&shdr.name), |
| 2662 | | }..]; |
| 2663 | | return name[0..std.mem.indexOfScalar(u8, name, 0).? :0]; |
| 2664 | | } |
| 2665 | | |
| 2666 | | fn string(elf: *Elf, comptime section: enum { shstrtab, strtab, dynstr }, key: []const u8) !u32 { |
| 2667 | | if (key.len == 0) return 0; |
| 2668 | | return @field(elf, @tagName(section)).get(elf, @field(elf.si, @tagName(section)), key); |
| 3686 | return shndx; |
| 2669 | 3687 | } |
| 2670 | 3688 | |
| 2671 | | pub fn addReloc( |
| 2672 | | elf: *Elf, |
| 2673 | | loc_si: Symbol.Index, |
| 2674 | | offset: u64, |
| 2675 | | target_si: Symbol.Index, |
| 2676 | | addend: i64, |
| 2677 | | @"type": Reloc.Type, |
| 2678 | | ) !void { |
| 2679 | | try elf.ensureUnusedRelocCapacity(loc_si, 1); |
| 2680 | | elf.addRelocAssumeCapacity(loc_si, offset, target_si, addend, @"type"); |
| 2681 | | } |
| 2682 | | pub fn ensureUnusedRelocCapacity(elf: *Elf, loc_si: Symbol.Index, len: usize) !void { |
| 3689 | fn ensureUnusedRelocCapacity(elf: *Elf, node: MappedFile.Node.Index, len: usize) !void { |
| 2683 | 3690 | if (len == 0) return; |
| 2684 | 3691 | const gpa = elf.base.comp.gpa; |
| 2685 | 3692 | try elf.relocs.ensureUnusedCapacity(gpa, len); |
| 2686 | 3693 | const class = elf.identClass(); |
| 2687 | | const rela_si, const rela_len = rela: switch (elf.ehdrField(.type)) { |
| 3694 | const rela_shndx, const rela_len = rela: switch (elf.ehdrField(.type)) { |
| 2688 | 3695 | .NONE, .CORE, _ => unreachable, |
| 2689 | 3696 | .REL => { |
| 2690 | | const shndx = loc_si.shndx(elf); |
| 2691 | | const sh = shndx.get(elf); |
| 2692 | | if (sh.rela_si == .null) { |
| 3697 | const shndx = elf.getNodeShndx(node); |
| 3698 | if (shndx.get(elf).rela_shndx == .UNDEF) { |
| 2693 | 3699 | var bfa_buf: [32]u8 = undefined; |
| 2694 | 3700 | var bfa: std.heap.BufferFirstAllocator = .init(&bfa_buf, gpa); |
| 2695 | 3701 | const allocator = bfa.allocator(); |
| 2696 | 3702 | |
| 2697 | | const rela_name = |
| 2698 | | try std.fmt.allocPrint(allocator, ".rela{s}", .{elf.sectionName(sh.si)}); |
| 3703 | const rela_name = try std.fmt.allocPrint(allocator, ".rela{s}", .{shndx.name(elf)}); |
| 2699 | 3704 | defer allocator.free(rela_name); |
| 2700 | 3705 | |
| 2701 | | sh.rela_si = try elf.addSection(.none, .{ |
| 3706 | const rela_shndx = try elf.addSection(.none, .{ |
| 2702 | 3707 | .name = rela_name, |
| 2703 | 3708 | .type = .RELA, |
| 2704 | | .link = @intFromEnum(elf.si.symtab.shndx(elf)), |
| 2705 | | .info = @intFromEnum(shndx), |
| 3709 | .link = @intFromEnum(Section.Index.symtab), |
| 3710 | .info = shndx.toSection().?, |
| 2706 | 3711 | .addralign = switch (class) { |
| 2707 | 3712 | .NONE, _ => unreachable, |
| 2708 | 3713 | .@"32" => .@"4", |
| ... | ... | @@ -2714,14 +3719,15 @@ pub fn ensureUnusedRelocCapacity(elf: *Elf, loc_si: Symbol.Index, len: usize) !v |
| 2714 | 3719 | }, |
| 2715 | 3720 | .node_align = elf.mf.flags.block_size, |
| 2716 | 3721 | }); |
| 3722 | shndx.get(elf).rela_shndx = rela_shndx; |
| 2717 | 3723 | } |
| 2718 | | break :rela .{ sh.rela_si, len }; |
| 3724 | break :rela .{ shndx.get(elf).rela_shndx, len }; |
| 2719 | 3725 | }, |
| 2720 | 3726 | .EXEC, .DYN => switch (elf.got.tlsld) { |
| 2721 | 3727 | _ => return, |
| 2722 | | .none => if (elf.si.dynamic != .null) { |
| 3728 | .none => if (elf.shndx.dynamic != .UNDEF) { |
| 2723 | 3729 | try elf.mf.updates.ensureUnusedCapacity(gpa, 1); |
| 2724 | | const got_ni = elf.si.got.node(elf); |
| 3730 | const got_ni = elf.shndx.got.get(elf).ni; |
| 2725 | 3731 | _, const got_node_size = got_ni.location(&elf.mf).resolve(&elf.mf); |
| 2726 | 3732 | const got_size = switch (class) { |
| 2727 | 3733 | .NONE, _ => unreachable, |
| ... | ... | @@ -2729,43 +3735,52 @@ pub fn ensureUnusedRelocCapacity(elf: *Elf, loc_si: Symbol.Index, len: usize) !v |
| 2729 | 3735 | }; |
| 2730 | 3736 | if (got_size > got_node_size) |
| 2731 | 3737 | try got_ni.resize(&elf.mf, gpa, got_size +| got_size / MappedFile.growth_factor); |
| 2732 | | break :rela .{ elf.si.got.shndx(elf).get(elf).rela_si, 1 }; |
| 3738 | break :rela .{ elf.shndx.got.get(elf).rela_shndx, 1 }; |
| 2733 | 3739 | } else return, |
| 2734 | 3740 | }, |
| 2735 | 3741 | }; |
| 2736 | | const rela_ni = rela_si.node(elf); |
| 3742 | const rela_ni = rela_shndx.get(elf).ni; |
| 2737 | 3743 | _, const rela_node_size = rela_ni.location(&elf.mf).resolve(&elf.mf); |
| 2738 | | const rela_size = switch (elf.shdrPtr(rela_si.shndx(elf))) { |
| 3744 | const rela_size = switch (elf.shdrPtr(rela_shndx)) { |
| 2739 | 3745 | inline else => |shdr| elf.targetLoad(&shdr.size) + elf.targetLoad(&shdr.entsize) * rela_len, |
| 2740 | 3746 | }; |
| 2741 | 3747 | if (rela_size > rela_node_size) |
| 2742 | 3748 | try rela_ni.resize(&elf.mf, gpa, rela_size +| rela_size / MappedFile.growth_factor); |
| 2743 | 3749 | } |
| 2744 | | pub fn addRelocAssumeCapacity( |
| 3750 | fn addRelocAssumeCapacity( |
| 2745 | 3751 | elf: *Elf, |
| 2746 | | loc_si: Symbol.Index, |
| 3752 | node: MappedFile.Node.Index, |
| 2747 | 3753 | offset: u64, |
| 2748 | | target_si: Symbol.Index, |
| 3754 | target: Symbol.Id, |
| 2749 | 3755 | addend: i64, |
| 2750 | 3756 | @"type": Reloc.Type, |
| 2751 | 3757 | ) void { |
| 2752 | | const target = target_si.get(elf); |
| 3758 | assert(node != .none); |
| 2753 | 3759 | const ri: Reloc.Index = @enumFromInt(elf.relocs.items.len); |
| 3760 | const next: Reloc.Index = next: { |
| 3761 | const target_ptr = target.index(elf).ptr(elf); |
| 3762 | const next = target_ptr.first_target_reloc; |
| 3763 | target_ptr.first_target_reloc = ri; |
| 3764 | break :next next; |
| 3765 | }; |
| 3766 | if (next != .none) { |
| 3767 | next.get(elf).prev = ri; |
| 3768 | } |
| 2754 | 3769 | elf.relocs.addOneAssumeCapacity().* = .{ |
| 2755 | 3770 | .type = @"type", |
| 2756 | 3771 | .prev = .none, |
| 2757 | | .next = target.target_relocs, |
| 2758 | | .loc = loc_si, |
| 2759 | | .target = target_si, |
| 3772 | .next = next, |
| 3773 | .node = node, |
| 3774 | .target = target, |
| 2760 | 3775 | .index = index: switch (elf.ehdrField(.type)) { |
| 2761 | 3776 | .NONE, .CORE, _ => unreachable, |
| 2762 | 3777 | .REL => { |
| 2763 | | const sh = loc_si.shndx(elf).get(elf); |
| 2764 | | switch (elf.shdrPtr(sh.rela_si.shndx(elf))) { |
| 3778 | const sh = elf.getNodeShndx(node).get(elf); |
| 3779 | switch (elf.shdrPtr(sh.rela_shndx)) { |
| 2765 | 3780 | inline else => |shdr, class| { |
| 2766 | 3781 | const Rela = class.ElfN().Rela; |
| 2767 | 3782 | const ent_size = elf.targetLoad(&shdr.entsize); |
| 2768 | | const rela_slice = sh.rela_si.node(elf).slice(&elf.mf); |
| 3783 | const rela_slice = sh.rela_shndx.get(elf).ni.slice(&elf.mf); |
| 2769 | 3784 | const index: u32 = if (sh.rela_free.unwrap()) |index| alloc_index: { |
| 2770 | 3785 | const rela: *Rela = @ptrCast(@alignCast( |
| 2771 | 3786 | rela_slice[@intCast(ent_size * index)..][0..@intCast(ent_size)], |
| ... | ... | @@ -2781,11 +3796,15 @@ pub fn addRelocAssumeCapacity( |
| 2781 | 3796 | const rela: *Rela = @ptrCast(@alignCast( |
| 2782 | 3797 | rela_slice[@intCast(ent_size * index)..][0..@intCast(ent_size)], |
| 2783 | 3798 | )); |
| 3799 | // The `offset` field here needs to equal the offset into the section, which |
| 3800 | // is *not* the same as our `offset` which is the offset into `node`. We |
| 3801 | // could calculate it now, but there's no point since `flushMovedNodeRelocs` |
| 3802 | // will eventually do that for us anyway. So for now, just set offset to 0. |
| 2784 | 3803 | rela.* = .{ |
| 2785 | | .offset = @intCast(offset), |
| 3804 | .offset = 0, |
| 2786 | 3805 | .info = .{ |
| 2787 | 3806 | .type = @intCast(@"type".unwrap(elf)), |
| 2788 | | .sym = @intCast(@intFromEnum(target_si)), |
| 3807 | .sym = @intCast(@intFromEnum(target.index(elf))), |
| 2789 | 3808 | }, |
| 2790 | 3809 | .addend = @intCast(addend), |
| 2791 | 3810 | }; |
| ... | ... | @@ -2802,25 +3821,25 @@ pub fn addRelocAssumeCapacity( |
| 2802 | 3821 | else => {}, |
| 2803 | 3822 | .TLSLD => switch (elf.got.tlsld) { |
| 2804 | 3823 | _ => {}, |
| 2805 | | .none => if (elf.si.dynamic != .null) { |
| 3824 | .none => if (elf.shndx.dynamic != .UNDEF) { |
| 2806 | 3825 | const tlsld_index = elf.got.len; |
| 2807 | 3826 | elf.got.tlsld = .wrap(tlsld_index); |
| 2808 | 3827 | elf.got.len = tlsld_index + 2; |
| 2809 | | const got_addr = got_addr: switch (elf.shdrPtr(elf.si.got.shndx(elf))) { |
| 3828 | const got_addr = got_addr: switch (elf.shdrPtr(elf.shndx.got)) { |
| 2810 | 3829 | inline else => |shdr, class| { |
| 2811 | 3830 | const addr_size = @sizeOf(class.ElfN().Addr); |
| 2812 | 3831 | const old_size = addr_size * tlsld_index; |
| 2813 | 3832 | const new_size = old_size + addr_size * 2; |
| 2814 | 3833 | @memset( |
| 2815 | | elf.si.got.node(elf).slice(&elf.mf)[old_size..new_size], |
| 3834 | elf.shndx.got.get(elf).ni.slice(&elf.mf)[old_size..new_size], |
| 2816 | 3835 | 0, |
| 2817 | 3836 | ); |
| 2818 | 3837 | break :got_addr elf.targetLoad(&shdr.addr) + old_size; |
| 2819 | 3838 | }, |
| 2820 | 3839 | }; |
| 2821 | | const rela_dyn_si = elf.si.got.shndx(elf).get(elf).rela_si; |
| 2822 | | const rela_dyn_ni = rela_dyn_si.node(elf); |
| 2823 | | switch (elf.shdrPtr(rela_dyn_si.shndx(elf))) { |
| 3840 | const rela_dyn_shndx = elf.shndx.got.get(elf).rela_shndx; |
| 3841 | const rela_dyn_ni = rela_dyn_shndx.get(elf).ni; |
| 3842 | switch (elf.shdrPtr(rela_dyn_shndx)) { |
| 2824 | 3843 | inline else => |shdr, class| { |
| 2825 | 3844 | const Rela = class.ElfN().Rela; |
| 2826 | 3845 | const old_size = elf.targetLoad(&shdr.size); |
| ... | ... | @@ -2851,11 +3870,6 @@ pub fn addRelocAssumeCapacity( |
| 2851 | 3870 | .offset = offset, |
| 2852 | 3871 | .addend = addend, |
| 2853 | 3872 | }; |
| 2854 | | switch (target.target_relocs) { |
| 2855 | | .none => {}, |
| 2856 | | else => |target_ri| target_ri.get(elf).prev = ri, |
| 2857 | | } |
| 2858 | | target.target_relocs = ri; |
| 2859 | 3873 | } |
| 2860 | 3874 | |
| 2861 | 3875 | pub fn updateNav(elf: *Elf, pt: Zcu.PerThread, nav_index: InternPool.Nav.Index) !void { |
| ... | ... | @@ -2877,30 +3891,12 @@ fn updateNavInner(elf: *Elf, pt: Zcu.PerThread, nav_index: InternPool.Nav.Index) |
| 2877 | 3891 | if (!Type.fromInterned(nav.resolved.?.type).hasRuntimeBits(zcu)) return; |
| 2878 | 3892 | |
| 2879 | 3893 | const nmi = try elf.navMapIndex(zcu, nav_index); |
| 2880 | | const si = nmi.symbol(elf); |
| 2881 | | const ni = ni: { |
| 2882 | | const sym = si.get(elf); |
| 2883 | | switch (sym.ni) { |
| 2884 | | .none => { |
| 2885 | | try elf.nodes.ensureUnusedCapacity(gpa, 1); |
| 2886 | | const sec_si = elf.navSection(ip, nav.resolved.?); |
| 2887 | | const ni = try elf.mf.addLastChildNode(gpa, sec_si.node(elf), .{ |
| 2888 | | .alignment = zcu.navAlignment(nav_index).toStdMem(), |
| 2889 | | .moved = true, |
| 2890 | | }); |
| 2891 | | elf.nodes.appendAssumeCapacity(.{ .nav = nmi }); |
| 2892 | | sym.ni = ni; |
| 2893 | | switch (elf.symPtr(si)) { |
| 2894 | | inline else => |sym_ptr, class| sym_ptr.shndx = |
| 2895 | | @field(elf.symPtr(sec_si), @tagName(class)).shndx, |
| 2896 | | } |
| 2897 | | }, |
| 2898 | | else => si.deleteLocationRelocs(elf), |
| 2899 | | } |
| 2900 | | assert(sym.loc_relocs == .none); |
| 2901 | | sym.loc_relocs = @enumFromInt(elf.relocs.items.len); |
| 2902 | | break :ni sym.ni; |
| 2903 | | }; |
| 3894 | const ni = nmi.symbol(elf).index().ptr(elf).node; |
| 3895 | elf.resetNodeRelocs(ni); |
| 3896 | |
| 3897 | // Ensure the NAV is marked as moved so that once we're done, `flushMoved` will eventually be |
| 3898 | // called to apply the NAV's new relocations. |
| 3899 | try ni.moved(gpa, &elf.mf); |
| 2904 | 3900 | |
| 2905 | 3901 | var nw: MappedFile.Node.Writer = undefined; |
| 2906 | 3902 | ni.writer(&elf.mf, gpa, &nw); |
| ... | ... | @@ -2911,54 +3907,14 @@ fn updateNavInner(elf: *Elf, pt: Zcu.PerThread, nav_index: InternPool.Nav.Index) |
| 2911 | 3907 | zcu.navSrcLoc(nav_index), |
| 2912 | 3908 | .fromInterned(nav.resolved.?.value), |
| 2913 | 3909 | &nw.interface, |
| 2914 | | .{ .atom_index = @intFromEnum(si) }, |
| 3910 | .{ .atom_index = Node.toAtom(ni) }, |
| 2915 | 3911 | ) catch |err| switch (err) { |
| 2916 | 3912 | error.WriteFailed => return error.OutOfMemory, |
| 2917 | 3913 | else => |e| return e, |
| 2918 | 3914 | }; |
| 2919 | | switch (elf.symPtr(si)) { |
| 3915 | switch (elf.symPtr(nmi.symbol(elf).index())) { |
| 2920 | 3916 | inline else => |sym| elf.targetStore(&sym.size, @intCast(nw.interface.end)), |
| 2921 | 3917 | } |
| 2922 | | si.applyLocationRelocs(elf); |
| 2923 | | } |
| 2924 | | |
| 2925 | | pub fn lowerUav( |
| 2926 | | elf: *Elf, |
| 2927 | | pt: Zcu.PerThread, |
| 2928 | | uav_val: InternPool.Index, |
| 2929 | | uav_align: InternPool.Alignment, |
| 2930 | | src_loc: Zcu.LazySrcLoc, |
| 2931 | | ) !codegen.SymbolResult { |
| 2932 | | const zcu = pt.zcu; |
| 2933 | | const gpa = zcu.gpa; |
| 2934 | | |
| 2935 | | try elf.pending_uavs.ensureUnusedCapacity(gpa, 1); |
| 2936 | | const umi = elf.uavMapIndex(uav_val) catch |err| switch (err) { |
| 2937 | | error.OutOfMemory => |e| return e, |
| 2938 | | else => |e| return .{ .fail = try Zcu.ErrorMsg.create( |
| 2939 | | gpa, |
| 2940 | | src_loc, |
| 2941 | | "linker failed to update constant: {s}", |
| 2942 | | .{@errorName(e)}, |
| 2943 | | ) }, |
| 2944 | | }; |
| 2945 | | const si = umi.symbol(elf); |
| 2946 | | if (switch (si.get(elf).ni) { |
| 2947 | | .none => true, |
| 2948 | | else => |ni| uav_align.toStdMem().order(ni.alignment(&elf.mf)).compare(.gt), |
| 2949 | | }) { |
| 2950 | | const gop = elf.pending_uavs.getOrPutAssumeCapacity(umi); |
| 2951 | | if (gop.found_existing) { |
| 2952 | | gop.value_ptr.alignment = gop.value_ptr.alignment.max(uav_align); |
| 2953 | | } else { |
| 2954 | | gop.value_ptr.* = .{ |
| 2955 | | .alignment = uav_align, |
| 2956 | | .src_loc = src_loc, |
| 2957 | | }; |
| 2958 | | elf.const_prog_node.increaseEstimatedTotalItems(1); |
| 2959 | | } |
| 2960 | | } |
| 2961 | | return .{ .sym_index = @intFromEnum(si) }; |
| 2962 | 3918 | } |
| 2963 | 3919 | |
| 2964 | 3920 | pub fn updateFunc( |
| ... | ... | @@ -2993,42 +3949,13 @@ fn updateFuncInner( |
| 2993 | 3949 | const nav = ip.getNav(func.owner_nav); |
| 2994 | 3950 | |
| 2995 | 3951 | const nmi = try elf.navMapIndex(zcu, func.owner_nav); |
| 2996 | | const si = nmi.symbol(elf); |
| 2997 | | log.debug("updateFunc({f}) = {d}", .{ nav.fqn.fmt(ip), si }); |
| 2998 | | const ni = ni: { |
| 2999 | | const sym = si.get(elf); |
| 3000 | | switch (sym.ni) { |
| 3001 | | .none => { |
| 3002 | | try elf.nodes.ensureUnusedCapacity(gpa, 1); |
| 3003 | | const sec_si = elf.navSection(ip, nav.resolved.?); |
| 3004 | | const mod = zcu.navFileScope(func.owner_nav).mod.?; |
| 3005 | | const target = &mod.resolved_target.result; |
| 3006 | | const ni = try elf.mf.addLastChildNode(gpa, sec_si.node(elf), .{ |
| 3007 | | .alignment = switch (nav.resolved.?.@"align") { |
| 3008 | | .none => switch (mod.optimize_mode) { |
| 3009 | | .Debug, |
| 3010 | | .ReleaseSafe, |
| 3011 | | .ReleaseFast, |
| 3012 | | => target_util.defaultFunctionAlignment(target), |
| 3013 | | .ReleaseSmall => target_util.minFunctionAlignment(target), |
| 3014 | | }, |
| 3015 | | else => |a| a.maxStrict(target_util.minFunctionAlignment(target)), |
| 3016 | | }.toStdMem(), |
| 3017 | | .moved = true, |
| 3018 | | }); |
| 3019 | | elf.nodes.appendAssumeCapacity(.{ .nav = nmi }); |
| 3020 | | sym.ni = ni; |
| 3021 | | switch (elf.symPtr(si)) { |
| 3022 | | inline else => |sym_ptr, class| sym_ptr.shndx = |
| 3023 | | @field(elf.symPtr(sec_si), @tagName(class)).shndx, |
| 3024 | | } |
| 3025 | | }, |
| 3026 | | else => si.deleteLocationRelocs(elf), |
| 3027 | | } |
| 3028 | | assert(sym.loc_relocs == .none); |
| 3029 | | sym.loc_relocs = @enumFromInt(elf.relocs.items.len); |
| 3030 | | break :ni sym.ni; |
| 3031 | | }; |
| 3952 | log.debug("updateFunc({f}) = {d}", .{ nav.fqn.fmt(ip), nmi.symbol(elf) }); |
| 3953 | const ni = nmi.symbol(elf).index().ptr(elf).node; |
| 3954 | elf.resetNodeRelocs(ni); |
| 3955 | |
| 3956 | // Ensure the NAV is marked as moved so that once we're done, `flushMoved` will eventually be |
| 3957 | // called to apply the NAV's new relocations. |
| 3958 | try ni.moved(gpa, &elf.mf); |
| 3032 | 3959 | |
| 3033 | 3960 | var nw: MappedFile.Node.Writer = undefined; |
| 3034 | 3961 | ni.writer(&elf.mf, gpa, &nw); |
| ... | ... | @@ -3038,7 +3965,7 @@ fn updateFuncInner( |
| 3038 | 3965 | pt, |
| 3039 | 3966 | zcu.navSrcLoc(func.owner_nav), |
| 3040 | 3967 | func_index, |
| 3041 | | @intFromEnum(si), |
| 3968 | Node.toAtom(ni), |
| 3042 | 3969 | mir, |
| 3043 | 3970 | &nw.interface, |
| 3044 | 3971 | .none, |
| ... | ... | @@ -3046,10 +3973,9 @@ fn updateFuncInner( |
| 3046 | 3973 | error.WriteFailed => return nw.err.?, |
| 3047 | 3974 | else => |e| return e, |
| 3048 | 3975 | }; |
| 3049 | | switch (elf.symPtr(si)) { |
| 3976 | switch (elf.symPtr(nmi.symbol(elf).index())) { |
| 3050 | 3977 | inline else => |sym| elf.targetStore(&sym.size, @intCast(nw.interface.end)), |
| 3051 | 3978 | } |
| 3052 | | si.applyLocationRelocs(elf); |
| 3053 | 3979 | } |
| 3054 | 3980 | |
| 3055 | 3981 | pub fn updateErrorData(elf: *Elf, pt: Zcu.PerThread) !void { |
| ... | ... | @@ -3072,7 +3998,42 @@ pub fn flush( |
| 3072 | 3998 | const comp = elf.base.comp; |
| 3073 | 3999 | _ = arena; |
| 3074 | 4000 | _ = prog_node; |
| 4001 | |
| 4002 | if (elf.ehdrField(.type) != .REL and |
| 4003 | elf.shndx.dynamic == .UNDEF and |
| 4004 | elf.globals.strong_undef.count() > 0) |
| 4005 | { |
| 4006 | for (elf.globals.strong_undef.keys()) |name| { |
| 4007 | comp.link_diags.addError("undefined global symbol '{s}'", .{name.slice(elf)}); |
| 4008 | } |
| 4009 | return error.LinkFailure; |
| 4010 | } |
| 4011 | |
| 3075 | 4012 | while (try elf.idle(tid)) {} |
| 4013 | |
| 4014 | const entry_addr: u64 = entry: { |
| 4015 | const sym_name_slice: []const u8 = name: switch (elf.options.entry) { |
| 4016 | .default => switch (comp.config.output_mode) { |
| 4017 | .Exe => continue :name .enabled, |
| 4018 | .Lib, .Obj => continue :name .disabled, |
| 4019 | }, |
| 4020 | .disabled => break :entry 0, |
| 4021 | .enabled => "_start", |
| 4022 | .named => |named| named, |
| 4023 | }; |
| 4024 | const sym_name_strtab = elf.string(.strtab, sym_name_slice) catch |err| switch (err) { |
| 4025 | error.Canceled => |e| return e, |
| 4026 | else => |e| return comp.link_diags.fail("flush write failed: {t}", .{e}), |
| 4027 | }; |
| 4028 | const global = elf.globalByName(sym_name_strtab) orelse break :entry 0; |
| 4029 | switch (elf.symPtr(global.symtab_index)) { |
| 4030 | inline else => |sym| break :entry elf.targetLoad(&sym.value), |
| 4031 | } |
| 4032 | }; |
| 4033 | switch (elf.ehdrPtr()) { |
| 4034 | inline else => |ehdr| elf.targetStore(&ehdr.entry, @intCast(entry_addr)), |
| 4035 | } |
| 4036 | |
| 3076 | 4037 | elf.mf.flush() catch |err| switch (err) { |
| 3077 | 4038 | error.Canceled => |e| return e, |
| 3078 | 4039 | else => |e| return comp.link_diags.fail("flush write failed: {t}", .{e}), |
| ... | ... | @@ -3082,15 +4043,10 @@ pub fn flush( |
| 3082 | 4043 | pub fn idle(elf: *Elf, tid: Zcu.PerThread.Id) !bool { |
| 3083 | 4044 | const comp = elf.base.comp; |
| 3084 | 4045 | task: { |
| 3085 | | while (elf.pending_uavs.pop()) |pending_uav| { |
| 3086 | | const sub_prog_node = elf.idleProgNode(tid, elf.const_prog_node, .{ .uav = pending_uav.key }); |
| 4046 | while (elf.pending_uavs.pop()) |umi| { |
| 4047 | const sub_prog_node = elf.idleProgNode(tid, elf.const_prog_node, .{ .uav = umi }); |
| 3087 | 4048 | defer sub_prog_node.end(); |
| 3088 | | elf.flushUav( |
| 3089 | | .{ .zcu = comp.zcu.?, .tid = tid }, |
| 3090 | | pending_uav.key, |
| 3091 | | pending_uav.value.alignment, |
| 3092 | | pending_uav.value.src_loc, |
| 3093 | | ) catch |err| switch (err) { |
| 4049 | elf.flushUav(.{ .zcu = comp.zcu.?, .tid = tid }, umi) catch |err| switch (err) { |
| 3094 | 4050 | error.OutOfMemory => |e| return e, |
| 3095 | 4051 | else => |e| return comp.link_diags.fail( |
| 3096 | 4052 | "linker failed to lower constant: {t}", |
| ... | ... | @@ -3127,9 +4083,9 @@ pub fn idle(elf: *Elf, tid: Zcu.PerThread.Id) !bool { |
| 3127 | 4083 | break :task; |
| 3128 | 4084 | }; |
| 3129 | 4085 | if (elf.input_section_pending_index < elf.input_sections.items.len) { |
| 3130 | | const isi: Node.InputSectionIndex = @enumFromInt(elf.input_section_pending_index); |
| 4086 | const isi: InputSection.Index = @enumFromInt(elf.input_section_pending_index); |
| 3131 | 4087 | elf.input_section_pending_index += 1; |
| 3132 | | const sub_prog_node = elf.idleProgNode(tid, elf.input_prog_node, elf.getNode(isi.symbol(elf).node(elf))); |
| 4088 | const sub_prog_node = elf.idleProgNode(tid, elf.input_prog_node, elf.getNode(isi.node(elf))); |
| 3133 | 4089 | defer sub_prog_node.end(); |
| 3134 | 4090 | elf.flushInputSection(isi) catch |err| switch (err) { |
| 3135 | 4091 | else => |e| { |
| ... | ... | @@ -3137,9 +4093,7 @@ pub fn idle(elf: *Elf, tid: Zcu.PerThread.Id) !bool { |
| 3137 | 4093 | return comp.link_diags.fail( |
| 3138 | 4094 | "linker failed to read input section '{s}' from \"{f}{f}\": {t}", |
| 3139 | 4095 | .{ |
| 3140 | | elf.sectionName( |
| 3141 | | elf.getNode(isi.symbol(elf).node(elf).parent(&elf.mf)).section, |
| 3142 | | ), |
| 4096 | elf.getNode(isi.node(elf).parent(&elf.mf)).section.name(elf), |
| 3143 | 4097 | ii.path(elf).fmtEscapeString(), |
| 3144 | 4098 | fmtMemberString(ii.member(elf)), |
| 3145 | 4099 | e, |
| ... | ... | @@ -3149,6 +4103,20 @@ pub fn idle(elf: *Elf, tid: Zcu.PerThread.Id) !bool { |
| 3149 | 4103 | }; |
| 3150 | 4104 | break :task; |
| 3151 | 4105 | } |
| 4106 | if (elf.changed_symtab_index.pop()) |kv| { |
| 4107 | if (elf.ehdrField(.type) == .REL) { |
| 4108 | const sub_prog_node = elf.mf.update_prog_node.start(kv.key.slice(elf), 0); |
| 4109 | defer sub_prog_node.end(); |
| 4110 | const sym = elf.globalByName(kv.key).?.symtab_index.ptr(elf); |
| 4111 | var ri = sym.first_target_reloc; |
| 4112 | while (ri != .none) { |
| 4113 | const reloc = ri.get(elf); |
| 4114 | reloc.updateTargetIndex(elf); |
| 4115 | ri = reloc.next; |
| 4116 | } |
| 4117 | break :task; |
| 4118 | } |
| 4119 | } |
| 3152 | 4120 | while (elf.mf.updates.pop()) |ni| { |
| 3153 | 4121 | const clean_moved = ni.cleanMoved(&elf.mf); |
| 3154 | 4122 | const clean_resized = ni.cleanResized(&elf.mf); |
| ... | ... | @@ -3161,9 +4129,10 @@ pub fn idle(elf: *Elf, tid: Zcu.PerThread.Id) !bool { |
| 3161 | 4129 | } else elf.mf.update_prog_node.completeOne(); |
| 3162 | 4130 | } |
| 3163 | 4131 | } |
| 3164 | | if (elf.pending_uavs.count() > 0) return true; |
| 4132 | if (elf.pending_uavs.items.len > 0) return true; |
| 3165 | 4133 | for (&elf.lazy.values) |lazy| if (lazy.map.count() > lazy.pending_index) return true; |
| 3166 | 4134 | if (elf.input_sections.items.len > elf.input_section_pending_index) return true; |
| 4135 | if (elf.changed_symtab_index.count() > 0) return true; |
| 3167 | 4136 | if (elf.mf.updates.items.len > 0) return true; |
| 3168 | 4137 | return false; |
| 3169 | 4138 | } |
| ... | ... | @@ -3177,13 +4146,13 @@ fn idleProgNode( |
| 3177 | 4146 | var name: [std.Progress.Node.max_name_len]u8 = undefined; |
| 3178 | 4147 | return prog_node.start(name: switch (node) { |
| 3179 | 4148 | else => |tag| @tagName(tag), |
| 3180 | | .section => |si| elf.sectionName(si), |
| 4149 | .section => |shndx| shndx.name(elf), |
| 3181 | 4150 | .input_section => |isi| { |
| 3182 | 4151 | const ii = isi.input(elf); |
| 3183 | 4152 | break :name std.fmt.bufPrint(&name, "{f}{f} {s}", .{ |
| 3184 | 4153 | ii.path(elf).fmtEscapeString(), |
| 3185 | 4154 | fmtMemberString(ii.member(elf)), |
| 3186 | | elf.sectionName(elf.getNode(isi.symbol(elf).node(elf).parent(&elf.mf)).section), |
| 4155 | elf.getNode(isi.node(elf).parent(&elf.mf)).section.name(elf), |
| 3187 | 4156 | }) catch &name; |
| 3188 | 4157 | }, |
| 3189 | 4158 | .nav => |nmi| { |
| ... | ... | @@ -3200,59 +4169,43 @@ fn flushUav( |
| 3200 | 4169 | elf: *Elf, |
| 3201 | 4170 | pt: Zcu.PerThread, |
| 3202 | 4171 | umi: Node.UavMapIndex, |
| 3203 | | uav_align: InternPool.Alignment, |
| 3204 | | src_loc: Zcu.LazySrcLoc, |
| 3205 | 4172 | ) !void { |
| 4173 | const comp = elf.base.comp; |
| 4174 | const gpa = comp.gpa; |
| 3206 | 4175 | const zcu = pt.zcu; |
| 3207 | | const gpa = zcu.gpa; |
| 3208 | 4176 | |
| 3209 | 4177 | const uav_val = umi.uavValue(elf); |
| 3210 | | const si = umi.symbol(elf); |
| 3211 | | const ni = ni: { |
| 3212 | | const sym = si.get(elf); |
| 3213 | | switch (sym.ni) { |
| 3214 | | .none => { |
| 3215 | | try elf.nodes.ensureUnusedCapacity(gpa, 1); |
| 3216 | | const sec_si = elf.si.data; |
| 3217 | | const ni = try elf.mf.addLastChildNode(gpa, sec_si.node(elf), .{ |
| 3218 | | .alignment = uav_align.toStdMem(), |
| 3219 | | .moved = true, |
| 3220 | | }); |
| 3221 | | elf.nodes.appendAssumeCapacity(.{ .uav = umi }); |
| 3222 | | sym.ni = ni; |
| 3223 | | switch (elf.symPtr(si)) { |
| 3224 | | inline else => |sym_ptr, class| sym_ptr.shndx = |
| 3225 | | @field(elf.symPtr(sec_si), @tagName(class)).shndx, |
| 3226 | | } |
| 3227 | | }, |
| 3228 | | else => { |
| 3229 | | if (sym.ni.alignment(&elf.mf).order(uav_align.toStdMem()).compare(.gte)) return; |
| 3230 | | si.deleteLocationRelocs(elf); |
| 3231 | | }, |
| 3232 | | } |
| 3233 | | assert(sym.loc_relocs == .none); |
| 3234 | | sym.loc_relocs = @enumFromInt(elf.relocs.items.len); |
| 3235 | | break :ni sym.ni; |
| 3236 | | }; |
| 4178 | const ni = umi.symbol(elf).index().ptr(elf).node; |
| 4179 | elf.resetNodeRelocs(ni); |
| 3237 | 4180 | |
| 3238 | 4181 | var nw: MappedFile.Node.Writer = undefined; |
| 3239 | 4182 | ni.writer(&elf.mf, gpa, &nw); |
| 3240 | 4183 | defer nw.deinit(); |
| 4184 | // TODO: UAV lowering should never require source locations. |
| 4185 | const dummy_src_loc: Zcu.LazySrcLoc = .{ |
| 4186 | .base_node_inst = try zcu.intern_pool.trackZir(gpa, comp.io, pt.tid, .{ |
| 4187 | .file = zcu.module_roots.get(zcu.std_mod).?.unwrap().?, |
| 4188 | .inst = .main_struct_inst, |
| 4189 | }), |
| 4190 | .offset = .{ .byte_abs = 0 }, |
| 4191 | }; |
| 3241 | 4192 | codegen.generateSymbol( |
| 3242 | 4193 | &elf.base, |
| 3243 | 4194 | pt, |
| 3244 | | src_loc, |
| 4195 | dummy_src_loc, |
| 3245 | 4196 | .fromInterned(uav_val), |
| 3246 | 4197 | &nw.interface, |
| 3247 | | .{ .atom_index = @intFromEnum(si) }, |
| 4198 | .{ .atom_index = Node.toAtom(ni) }, |
| 3248 | 4199 | ) catch |err| switch (err) { |
| 3249 | 4200 | error.WriteFailed => return error.OutOfMemory, |
| 3250 | 4201 | else => |e| return e, |
| 3251 | 4202 | }; |
| 3252 | | switch (elf.symPtr(si)) { |
| 4203 | switch (elf.symPtr(umi.symbol(elf).index())) { |
| 3253 | 4204 | inline else => |sym| elf.targetStore(&sym.size, @intCast(nw.interface.end)), |
| 3254 | 4205 | } |
| 3255 | | si.applyLocationRelocs(elf); |
| 4206 | // The UAV should already be considered to have moved, because it is created as moved and |
| 4207 | // pending calls to `flushUav` always happen before pending calls to `flushMoved`. |
| 4208 | assert(ni.hasMoved(&elf.mf)); |
| 3256 | 4209 | } |
| 3257 | 4210 | |
| 3258 | 4211 | fn flushLazy(elf: *Elf, pt: Zcu.PerThread, lmr: Node.LazyMapRef) !void { |
| ... | ... | @@ -3260,33 +4213,12 @@ fn flushLazy(elf: *Elf, pt: Zcu.PerThread, lmr: Node.LazyMapRef) !void { |
| 3260 | 4213 | const gpa = zcu.gpa; |
| 3261 | 4214 | |
| 3262 | 4215 | const lazy = lmr.lazySymbol(elf); |
| 3263 | | const si = lmr.symbol(elf); |
| 3264 | | const ni = ni: { |
| 3265 | | const sym = si.get(elf); |
| 3266 | | switch (sym.ni) { |
| 3267 | | .none => { |
| 3268 | | try elf.nodes.ensureUnusedCapacity(gpa, 1); |
| 3269 | | const sec_si: Symbol.Index = switch (lazy.kind) { |
| 3270 | | .code => .text, |
| 3271 | | .const_data => .rodata, |
| 3272 | | }; |
| 3273 | | const ni = try elf.mf.addLastChildNode(gpa, sec_si.node(elf), .{ .moved = true }); |
| 3274 | | elf.nodes.appendAssumeCapacity(switch (lazy.kind) { |
| 3275 | | .code => .{ .lazy_code = @enumFromInt(lmr.index) }, |
| 3276 | | .const_data => .{ .lazy_const_data = @enumFromInt(lmr.index) }, |
| 3277 | | }); |
| 3278 | | sym.ni = ni; |
| 3279 | | switch (elf.symPtr(si)) { |
| 3280 | | inline else => |sym_ptr, class| sym_ptr.shndx = |
| 3281 | | @field(elf.symPtr(sec_si), @tagName(class)).shndx, |
| 3282 | | } |
| 3283 | | }, |
| 3284 | | else => si.deleteLocationRelocs(elf), |
| 3285 | | } |
| 3286 | | assert(sym.loc_relocs == .none); |
| 3287 | | sym.loc_relocs = @enumFromInt(elf.relocs.items.len); |
| 3288 | | break :ni sym.ni; |
| 3289 | | }; |
| 4216 | const ni = lmr.symbol(elf).index().ptr(elf).node; |
| 4217 | elf.resetNodeRelocs(ni); |
| 4218 | |
| 4219 | // Ensure the lazy node is marked as moved so that once we're done, `flushMoved` will eventually |
| 4220 | // be called to apply the lazy node's new relocations. |
| 4221 | try ni.moved(gpa, &elf.mf); |
| 3290 | 4222 | |
| 3291 | 4223 | var required_alignment: InternPool.Alignment = .none; |
| 3292 | 4224 | var nw: MappedFile.Node.Writer = undefined; |
| ... | ... | @@ -3300,15 +4232,14 @@ fn flushLazy(elf: *Elf, pt: Zcu.PerThread, lmr: Node.LazyMapRef) !void { |
| 3300 | 4232 | &required_alignment, |
| 3301 | 4233 | &nw.interface, |
| 3302 | 4234 | .none, |
| 3303 | | .{ .atom_index = @intFromEnum(si) }, |
| 4235 | .{ .atom_index = Node.toAtom(ni) }, |
| 3304 | 4236 | ); |
| 3305 | | switch (elf.symPtr(si)) { |
| 4237 | switch (elf.symPtr(lmr.symbol(elf).index())) { |
| 3306 | 4238 | inline else => |sym| elf.targetStore(&sym.size, @intCast(nw.interface.end)), |
| 3307 | 4239 | } |
| 3308 | | si.applyLocationRelocs(elf); |
| 3309 | 4240 | } |
| 3310 | 4241 | |
| 3311 | | fn flushInputSection(elf: *Elf, isi: Node.InputSectionIndex) !void { |
| 4242 | fn flushInputSection(elf: *Elf, isi: InputSection.Index) !void { |
| 3312 | 4243 | const file_loc = isi.fileLocation(elf); |
| 3313 | 4244 | if (file_loc.size == 0) return; |
| 3314 | 4245 | const comp = elf.base.comp; |
| ... | ... | @@ -3321,12 +4252,13 @@ fn flushInputSection(elf: *Elf, isi: Node.InputSectionIndex) !void { |
| 3321 | 4252 | var fr = file.reader(io, &.{}); |
| 3322 | 4253 | try fr.seekTo(file_loc.offset); |
| 3323 | 4254 | var nw: MappedFile.Node.Writer = undefined; |
| 3324 | | const si = isi.symbol(elf); |
| 3325 | | si.node(elf).writer(&elf.mf, gpa, &nw); |
| 4255 | isi.node(elf).writer(&elf.mf, gpa, &nw); |
| 3326 | 4256 | defer nw.deinit(); |
| 3327 | 4257 | if (try nw.interface.sendFileAll(&fr, .limited(@intCast(file_loc.size))) != file_loc.size) |
| 3328 | 4258 | return error.EndOfStream; |
| 3329 | | si.applyLocationRelocs(elf); |
| 4259 | // The input section should already be considered to have moved, because it is created as moved |
| 4260 | // and pending calls to `flushInputSection` always happen before pending calls to `flushMoved`. |
| 4261 | assert(isi.node(elf).hasMoved(&elf.mf)); |
| 3330 | 4262 | } |
| 3331 | 4263 | |
| 3332 | 4264 | fn flushFileOffset(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| ... | ... | @@ -3349,7 +4281,7 @@ fn flushFileOffset(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3349 | 4281 | var child_it = ni.children(&elf.mf); |
| 3350 | 4282 | while (child_it.next()) |child_ni| try elf.flushFileOffset(child_ni); |
| 3351 | 4283 | }, |
| 3352 | | .section => |si| switch (elf.shdrPtr(si.shndx(elf))) { |
| 4284 | .section => |shndx| switch (elf.shdrPtr(shndx)) { |
| 3353 | 4285 | inline else => |shdr| elf.targetStore(&shdr.offset, @intCast( |
| 3354 | 4286 | ni.fileLocation(&elf.mf, false).offset, |
| 3355 | 4287 | )), |
| ... | ... | @@ -3378,22 +4310,21 @@ fn flushMoved(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3378 | 4310 | }, |
| 3379 | 4311 | } |
| 3380 | 4312 | }, |
| 3381 | | .section => |si| { |
| 4313 | .section => |shndx| { |
| 3382 | 4314 | try elf.flushFileOffset(ni); |
| 3383 | 4315 | const addr = elf.computeNodeVAddr(ni); |
| 3384 | | const shndx = si.shndx(elf); |
| 3385 | 4316 | switch (elf.shdrPtr(shndx)) { |
| 3386 | 4317 | inline else => |shdr, class| { |
| 3387 | 4318 | const flags = elf.targetLoad(&shdr.flags).shf; |
| 3388 | 4319 | if (flags.ALLOC) { |
| 3389 | | if (elf.si.dynamic != .null) { |
| 3390 | | if (si == elf.si.got) { |
| 4320 | if (elf.shndx.dynamic != .UNDEF) { |
| 4321 | if (shndx == elf.shndx.got) { |
| 3391 | 4322 | const old_addr = elf.targetLoad(&shdr.addr); |
| 3392 | | const rela_dyn_si = shndx.get(elf).rela_si; |
| 4323 | const rela_dyn_shndx = shndx.get(elf).rela_shndx; |
| 3393 | 4324 | const relas: []class.ElfN().Rela = @ptrCast(@alignCast( |
| 3394 | | rela_dyn_si.node(elf).slice(&elf.mf)[0..@intCast( |
| 4325 | rela_dyn_shndx.get(elf).ni.slice(&elf.mf)[0..@intCast( |
| 3395 | 4326 | elf.targetLoad(&@field( |
| 3396 | | elf.shdrPtr(rela_dyn_si.shndx(elf)), |
| 4327 | elf.shdrPtr(rela_dyn_shndx), |
| 3397 | 4328 | @tagName(class), |
| 3398 | 4329 | ).size), |
| 3399 | 4330 | )], |
| ... | ... | @@ -3413,19 +4344,19 @@ fn flushMoved(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3413 | 4344 | ), |
| 3414 | 4345 | }, |
| 3415 | 4346 | } |
| 3416 | | } else if (si == elf.si.got_plt) { |
| 4347 | } else if (shndx == elf.shndx.got_plt) { |
| 3417 | 4348 | const target_endian = elf.targetEndian(); |
| 3418 | 4349 | const old_addr = elf.targetLoad(&shdr.addr); |
| 3419 | | const rela_plt_si = shndx.get(elf).rela_si; |
| 4350 | const rela_plt_shndx = shndx.get(elf).rela_shndx; |
| 3420 | 4351 | const relas: []class.ElfN().Rela = @ptrCast(@alignCast( |
| 3421 | | rela_plt_si.node(elf).slice(&elf.mf)[0..@intCast( |
| 4352 | rela_plt_shndx.get(elf).ni.slice(&elf.mf)[0..@intCast( |
| 3422 | 4353 | elf.targetLoad(&@field( |
| 3423 | | elf.shdrPtr(rela_plt_si.shndx(elf)), |
| 4354 | elf.shdrPtr(rela_plt_shndx), |
| 3424 | 4355 | @tagName(class), |
| 3425 | 4356 | ).size), |
| 3426 | 4357 | )], |
| 3427 | 4358 | )); |
| 3428 | | const plt_sec_slice = elf.si.plt_sec.node(elf).slice(&elf.mf); |
| 4359 | const plt_sec_slice = elf.shndx.plt_sec.get(elf).ni.slice(&elf.mf); |
| 3429 | 4360 | switch (elf.ehdrField(.machine)) { |
| 3430 | 4361 | else => |machine| @panic(@tagName(machine)), |
| 3431 | 4362 | .AARCH64, .PPC64, .RISCV => {}, |
| ... | ... | @@ -3454,7 +4385,7 @@ fn flushMoved(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3454 | 4385 | } |
| 3455 | 4386 | }, |
| 3456 | 4387 | } |
| 3457 | | } else if (si == elf.si.plt_sec) { |
| 4388 | } else if (shndx == elf.shndx.plt_sec) { |
| 3458 | 4389 | const target_endian = elf.targetEndian(); |
| 3459 | 4390 | const old_addr = elf.targetLoad(&shdr.addr); |
| 3460 | 4391 | const plt_sec_slice = ni.slice(&elf.mf); |
| ... | ... | @@ -3477,34 +4408,72 @@ fn flushMoved(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3477 | 4408 | } |
| 3478 | 4409 | } |
| 3479 | 4410 | elf.targetStore(&shdr.addr, @intCast(addr)); |
| 3480 | | @field(elf.symPtr(si), @tagName(class)).value = shdr.addr; |
| 4411 | shndx.get(elf).lsi.index().flushMoved(elf, addr); |
| 4412 | } |
| 4413 | |
| 4414 | if (shndx == elf.shndx.plt) { |
| 4415 | elf.flushMovedNodeRelocs(ni, elf.targetLoad(&shdr.addr), elf.first_plt_reloc); |
| 4416 | } else if (shndx == elf.shndx.dynamic) { |
| 4417 | elf.flushMovedNodeRelocs(ni, elf.targetLoad(&shdr.addr), elf.first_dynamic_reloc); |
| 3481 | 4418 | } |
| 3482 | 4419 | }, |
| 3483 | 4420 | } |
| 3484 | | si.flushMoved(elf, addr); |
| 3485 | 4421 | }, |
| 3486 | 4422 | .input_section => |isi| { |
| 3487 | | const old_addr = switch (elf.symPtr(isi.symbol(elf))) { |
| 3488 | | inline else => |sym| elf.targetLoad(&sym.value), |
| 3489 | | }; |
| 3490 | | const new_addr = elf.computeNodeVAddr(ni); |
| 4423 | const old_section_addr = isi.ptr(elf).vaddr; |
| 4424 | const new_section_addr = elf.computeNodeVAddr(ni); |
| 4425 | isi.ptr(elf).vaddr = new_section_addr; |
| 4426 | |
| 4427 | // Update local symbols |
| 3491 | 4428 | const ii = isi.input(elf); |
| 3492 | | var si = ii.symbol(elf); |
| 3493 | | const end_si = ii.endSymbol(elf); |
| 3494 | | while (cond: { |
| 3495 | | si = si.next(); |
| 3496 | | break :cond si != end_si; |
| 3497 | | }) { |
| 3498 | | if (si.get(elf).ni != ni) continue; |
| 3499 | | si.flushMoved(elf, switch (elf.symPtr(si)) { |
| 3500 | | inline else => |sym| elf.targetLoad(&sym.value), |
| 3501 | | } - old_addr + new_addr); |
| 4429 | var lsi, const end_lsi = ii.localSymbolRange(elf); |
| 4430 | while (lsi != end_lsi) : (lsi = @enumFromInt(@intFromEnum(lsi) + 1)) { |
| 4431 | if (lsi.index().ptr(elf).node != ni) continue; |
| 4432 | const old_sym_addr: u64 = switch (elf.symPtr(lsi.index())) { |
| 4433 | inline else => |sym| switch (elf.targetLoad(&sym.other).visibility) { |
| 4434 | .HIDDEN, .INTERNAL => { |
| 4435 | // This is actually a global symbol which got demoted to STB_LOCAL due |
| 4436 | // to its visibility. It will be handled in the global symbols pass |
| 4437 | // below; don't touch it now. |
| 4438 | continue; |
| 4439 | }, |
| 4440 | .PROTECTED => unreachable, // not allowed for an STB_LOCAL symbol |
| 4441 | .DEFAULT => elf.targetLoad(&sym.value), |
| 4442 | }, |
| 4443 | }; |
| 4444 | lsi.index().flushMoved(elf, old_sym_addr - old_section_addr + new_section_addr); |
| 4445 | } |
| 4446 | |
| 4447 | // Update global symbols |
| 4448 | if (elf.node_global_symbols.get(ni)) |first_name| { |
| 4449 | assert(first_name != .empty); |
| 4450 | var name = first_name; |
| 4451 | while (name != .empty) { |
| 4452 | const global = elf.globalByName(name).?; |
| 4453 | const old_sym_addr: u64 = switch (elf.symPtr(global.symtab_index)) { |
| 4454 | inline else => |sym| elf.targetLoad(&sym.value), |
| 4455 | }; |
| 4456 | global.flushMoved(elf, old_sym_addr - old_section_addr + new_section_addr); |
| 4457 | name = global.next_in_node; |
| 4458 | } |
| 3502 | 4459 | } |
| 4460 | |
| 4461 | elf.flushMovedNodeRelocs(ni, new_section_addr, isi.ptrConst(elf).first_reloc); |
| 4462 | }, |
| 4463 | inline .nav, .uav, .lazy_code, .lazy_const_data => |mi| { |
| 4464 | const new_addr = elf.computeNodeVAddr(ni); |
| 4465 | mi.symbol(elf).index().flushMoved(elf, new_addr); |
| 4466 | if (elf.node_global_symbols.get(ni)) |first_name| { |
| 4467 | assert(first_name != .empty); |
| 4468 | var name = first_name; |
| 4469 | while (name != .empty) { |
| 4470 | const global = elf.globalByName(name).?; |
| 4471 | global.flushMoved(elf, new_addr); |
| 4472 | name = global.next_in_node; |
| 4473 | } |
| 4474 | } |
| 4475 | elf.flushMovedNodeRelocs(ni, new_addr, mi.firstReloc(elf)); |
| 3503 | 4476 | }, |
| 3504 | | inline .nav, .uav, .lazy_code, .lazy_const_data => |mi| mi.symbol(elf).flushMoved( |
| 3505 | | elf, |
| 3506 | | elf.computeNodeVAddr(ni), |
| 3507 | | ), |
| 3508 | 4477 | } |
| 3509 | 4478 | try ni.childrenMoved(elf.base.comp.gpa, &elf.mf); |
| 3510 | 4479 | } |
| ... | ... | @@ -3542,7 +4511,7 @@ fn flushResized(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3542 | 4511 | switch (elf.targetLoad(&next_ph.type)) { |
| 3543 | 4512 | else => unreachable, |
| 3544 | 4513 | .NULL, .LOAD => {}, |
| 3545 | | .DYNAMIC, .INTERP, .PHDR, .TLS => break, |
| 4514 | .DYNAMIC, .INTERP, .PHDR, .TLS, std.elf.PT.GNU_RELRO => break, |
| 3546 | 4515 | } |
| 3547 | 4516 | const next_vaddr = elf.targetLoad(&next_ph.vaddr); |
| 3548 | 4517 | if (vaddr + memsz <= next_vaddr) break; |
| ... | ... | @@ -3564,7 +4533,7 @@ fn flushResized(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3564 | 4533 | } |
| 3565 | 4534 | }, |
| 3566 | 4535 | }, |
| 3567 | | .section => |si| switch (elf.shdrPtr(si.shndx(elf))) { |
| 4536 | .section => |shndx| switch (elf.shdrPtr(shndx)) { |
| 3568 | 4537 | inline else => |shdr, class| { |
| 3569 | 4538 | switch (elf.targetLoad(&shdr.type)) { |
| 3570 | 4539 | else => unreachable, |
| ... | ... | @@ -3572,10 +4541,10 @@ fn flushResized(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3572 | 4541 | .PROGBITS => if (size == 0) elf.targetStore(&shdr.type, .NULL), |
| 3573 | 4542 | .SYMTAB, .DYNAMIC, .REL, .DYNSYM => return, |
| 3574 | 4543 | .STRTAB => { |
| 3575 | | if (elf.si.dynamic != .null) { |
| 3576 | | if (si == elf.si.dynstr) { |
| 4544 | if (elf.shndx.dynamic != .UNDEF) { |
| 4545 | if (shndx == elf.shndx.dynstr) { |
| 3577 | 4546 | const dynamic_entries: [][2]class.ElfN().Addr = @ptrCast(@alignCast( |
| 3578 | | elf.si.dynamic.node(elf).slice(&elf.mf), |
| 4547 | elf.shndx.dynamic.get(elf).ni.slice(&elf.mf), |
| 3579 | 4548 | )); |
| 3580 | 4549 | for (dynamic_entries) |*dynamic_entry| |
| 3581 | 4550 | switch (elf.targetLoad(&dynamic_entry[0])) { |
| ... | ... | @@ -3587,19 +4556,19 @@ fn flushResized(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3587 | 4556 | return; |
| 3588 | 4557 | }, |
| 3589 | 4558 | .RELA => { |
| 3590 | | if (elf.si.dynamic != .null) { |
| 3591 | | if (si == elf.si.got.shndx(elf).get(elf).rela_si) { |
| 4559 | if (elf.shndx.dynamic != .UNDEF) { |
| 4560 | if (shndx == elf.shndx.got.get(elf).rela_shndx) { |
| 3592 | 4561 | const dynamic_entries: [][2]class.ElfN().Addr = @ptrCast(@alignCast( |
| 3593 | | elf.si.dynamic.node(elf).slice(&elf.mf), |
| 4562 | elf.shndx.dynamic.get(elf).ni.slice(&elf.mf), |
| 3594 | 4563 | )); |
| 3595 | 4564 | for (dynamic_entries) |*dynamic_entry| |
| 3596 | 4565 | switch (elf.targetLoad(&dynamic_entry[0])) { |
| 3597 | 4566 | else => {}, |
| 3598 | 4567 | std.elf.DT_RELASZ => dynamic_entry[1] = shdr.size, |
| 3599 | 4568 | }; |
| 3600 | | } else if (si == elf.si.got_plt.shndx(elf).get(elf).rela_si) { |
| 4569 | } else if (shndx == elf.shndx.got_plt.get(elf).rela_shndx) { |
| 3601 | 4570 | const dynamic_entries: [][2]class.ElfN().Addr = @ptrCast(@alignCast( |
| 3602 | | elf.si.dynamic.node(elf).slice(&elf.mf), |
| 4571 | elf.shndx.dynamic.get(elf).ni.slice(&elf.mf), |
| 3603 | 4572 | )); |
| 3604 | 4573 | for (dynamic_entries) |*dynamic_entry| |
| 3605 | 4574 | switch (elf.targetLoad(&dynamic_entry[0])) { |
| ... | ... | @@ -3611,7 +4580,9 @@ fn flushResized(elf: *Elf, ni: MappedFile.Node.Index) !void { |
| 3611 | 4580 | return; |
| 3612 | 4581 | }, |
| 3613 | 4582 | } |
| 3614 | | elf.targetStore(&shdr.size, @intCast(size)); |
| 4583 | if (shndx != elf.shndx.plt) { |
| 4584 | elf.targetStore(&shdr.size, @intCast(size)); |
| 4585 | } |
| 3615 | 4586 | }, |
| 3616 | 4587 | }, |
| 3617 | 4588 | .input_section, .nav, .uav, .lazy_code, .lazy_const_data => {}, |
| ... | ... | @@ -3642,7 +4613,6 @@ fn updateExportsInner( |
| 3642 | 4613 | export_indices: []const Zcu.Export.Index, |
| 3643 | 4614 | ) !void { |
| 3644 | 4615 | const zcu = pt.zcu; |
| 3645 | | const gpa = zcu.gpa; |
| 3646 | 4616 | const ip = &zcu.intern_pool; |
| 3647 | 4617 | |
| 3648 | 4618 | switch (exported) { |
| ... | ... | @@ -3652,44 +4622,35 @@ fn updateExportsInner( |
| 3652 | 4622 | Value.fromInterned(uav).fmtValue(pt), |
| 3653 | 4623 | }), |
| 3654 | 4624 | } |
| 3655 | | try elf.symtab.ensureUnusedCapacity(gpa, export_indices.len); |
| 3656 | | const exported_si: Symbol.Index, const @"type": std.elf.STT = switch (exported) { |
| 4625 | try elf.ensureUnusedSymbolCapacity(@intCast(export_indices.len), .maybe_global); |
| 4626 | const exported_lsi: Symbol.LocalIndex, const @"type": std.elf.STT = switch (exported) { |
| 3657 | 4627 | .nav => |nav| .{ |
| 3658 | | try elf.navSymbol(zcu, nav), |
| 4628 | (try elf.navMapIndex(zcu, nav)).symbol(elf), |
| 3659 | 4629 | navType(ip, ip.getNav(nav).resolved.?, elf.base.comp.config.any_non_single_threaded), |
| 3660 | 4630 | }, |
| 3661 | | .uav => |uav| .{ @enumFromInt(switch (try elf.lowerUav( |
| 3662 | | pt, |
| 3663 | | uav, |
| 3664 | | Type.fromInterned(ip.typeOf(uav)).abiAlignment(zcu), |
| 3665 | | export_indices[0].ptr(zcu).src, |
| 3666 | | )) { |
| 3667 | | .sym_index => |si| si, |
| 3668 | | .fail => |em| { |
| 3669 | | defer em.destroy(gpa); |
| 3670 | | return elf.base.comp.link_diags.fail("{s}", .{em.msg}); |
| 3671 | | }, |
| 3672 | | }), .OBJECT }, |
| 4631 | .uav => |uav| .{ (try elf.uavMapIndex(uav, .none)).symbol(elf), .OBJECT }, |
| 3673 | 4632 | }; |
| 3674 | 4633 | while (try elf.idle(pt.tid)) {} |
| 3675 | | const exported_ni = exported_si.node(elf); |
| 3676 | | const value, const size, const shndx = switch (elf.symPtr(exported_si)) { |
| 4634 | const value: u64, const size: u64, const shndx: Section.Index = switch (elf.symPtr(exported_lsi.index())) { |
| 3677 | 4635 | inline else => |exported_sym| .{ |
| 3678 | 4636 | elf.targetLoad(&exported_sym.value), |
| 3679 | | exported_sym.size, |
| 3680 | | exported_sym.shndx, |
| 4637 | elf.targetLoad(&exported_sym.size), |
| 4638 | .fromSection(elf.targetLoad(&exported_sym.shndx)), |
| 3681 | 4639 | }, |
| 3682 | 4640 | }; |
| 3683 | 4641 | for (export_indices) |export_index| { |
| 3684 | 4642 | const @"export" = export_index.ptr(zcu); |
| 3685 | 4643 | const name = @"export".opts.name.toSlice(ip); |
| 3686 | | const export_si = try elf.globalSymbol(.{ |
| 3687 | | .name = name, |
| 4644 | _ = elf.addGlobalSymbolAssumeCapacity(.{ |
| 4645 | .node = .none, |
| 4646 | .name = try .string(elf, name), |
| 4647 | .value = value, |
| 4648 | .size = @intCast(size), |
| 3688 | 4649 | .type = @"type", |
| 3689 | 4650 | .bind = switch (@"export".opts.linkage) { |
| 3690 | | .internal => .LOCAL, |
| 3691 | | .strong => .GLOBAL, |
| 3692 | | .weak => .WEAK, |
| 4651 | .internal => @panic("TODO internal linkage"), |
| 4652 | .strong => .strong, |
| 4653 | .weak => .weak, |
| 3693 | 4654 | .link_once => return error.LinkOnceUnsupported, |
| 3694 | 4655 | }, |
| 3695 | 4656 | .visibility = switch (@"export".opts.visibility) { |
| ... | ... | @@ -3697,15 +4658,23 @@ fn updateExportsInner( |
| 3697 | 4658 | .hidden => .HIDDEN, |
| 3698 | 4659 | .protected => .PROTECTED, |
| 3699 | 4660 | }, |
| 3700 | | }); |
| 3701 | | export_si.get(elf).ni = exported_ni; |
| 3702 | | switch (elf.symPtr(export_si)) { |
| 3703 | | inline else => |export_sym| { |
| 3704 | | export_sym.size = @intCast(size); |
| 3705 | | export_sym.shndx = shndx; |
| 4661 | .shndx = shndx, |
| 4662 | }) catch |err| switch (err) { |
| 4663 | error.MultipleDefinitions => { |
| 4664 | // HACK: because we currently don't/can't delete these exports, we would typically |
| 4665 | // get these errors on every non-initial incremental update. Hack around that by |
| 4666 | // only emitting this error if the symbol we're conflicting with comes from an input |
| 4667 | // section (as opposed to the ZCU). |
| 4668 | const conflicting_global = elf.globalByName(try elf.string(.strtab, name)).?; |
| 4669 | const conflicting_node = conflicting_global.symtab_index.ptr(elf).node; |
| 4670 | if (elf.getNode(conflicting_node) == .input_section) { |
| 4671 | return elf.base.comp.link_diags.fail( |
| 4672 | "multiple definitions of '{s}'", |
| 4673 | .{name}, |
| 4674 | ); |
| 4675 | } |
| 3706 | 4676 | }, |
| 3707 | | } |
| 3708 | | export_si.flushMoved(elf, value); |
| 4677 | }; |
| 3709 | 4678 | } |
| 3710 | 4679 | } |
| 3711 | 4680 | |
| ... | ... | @@ -3759,13 +4728,13 @@ pub fn printNode( |
| 3759 | 4728 | try w.writeByte(')'); |
| 3760 | 4729 | }, |
| 3761 | 4730 | }, |
| 3762 | | .section => |si| try w.print("({s})", .{elf.sectionName(si)}), |
| 4731 | .section => |shndx| try w.print("({s})", .{shndx.name(elf)}), |
| 3763 | 4732 | .input_section => |isi| { |
| 3764 | 4733 | const ii = isi.input(elf); |
| 3765 | 4734 | try w.print("({f}{f}, {s})", .{ |
| 3766 | 4735 | ii.path(elf).fmtEscapeString(), |
| 3767 | 4736 | fmtMemberString(ii.member(elf)), |
| 3768 | | elf.sectionName(elf.getNode(isi.symbol(elf).node(elf).parent(&elf.mf)).section), |
| 4737 | elf.getNode(isi.node(elf).parent(&elf.mf)).section.name(elf), |
| 3769 | 4738 | }); |
| 3770 | 4739 | }, |
| 3771 | 4740 | .nav => |nmi| { |
Matthew Lugg <mlugg@mlugg.co.uk> 2026-05-18 08:22:47+02:00
src