1const builtin = @import("builtin");
2const std = @import("../../std.zig");
3const SYS = std.os.linux.SYS;
4
5pub const syscall_arg_t = u64;
6
7pub fn syscall0(
8 number: SYS,
9) u64 {
10 return asm volatile ("syscall"
11 : [ret] "={rax}" (-> u64),
12 : [number] "{rax}" (@backingInt(number)),
13 : .{ .rcx = true, .r11 = true, .memory = true });
14}
15
16pub fn syscall1(
17 number: SYS,
18 arg1: syscall_arg_t,
19) u64 {
20 return asm volatile ("syscall"
21 : [ret] "={rax}" (-> u64),
22 : [number] "{rax}" (@backingInt(number)),
23 [arg1] "{rdi}" (arg1),
24 : .{ .rcx = true, .r11 = true, .memory = true });
25}
26
27pub fn syscall2(
28 number: SYS,
29 arg1: syscall_arg_t,
30 arg2: syscall_arg_t,
31) u64 {
32 return asm volatile ("syscall"
33 : [ret] "={rax}" (-> u64),
34 : [number] "{rax}" (@backingInt(number)),
35 [arg1] "{rdi}" (arg1),
36 [arg2] "{rsi}" (arg2),
37 : .{ .rcx = true, .r11 = true, .memory = true });
38}
39
40pub fn syscall3(
41 number: SYS,
42 arg1: syscall_arg_t,
43 arg2: syscall_arg_t,
44 arg3: syscall_arg_t,
45) u64 {
46 return asm volatile ("syscall"
47 : [ret] "={rax}" (-> u64),
48 : [number] "{rax}" (@backingInt(number)),
49 [arg1] "{rdi}" (arg1),
50 [arg2] "{rsi}" (arg2),
51 [arg3] "{rdx}" (arg3),
52 : .{ .rcx = true, .r11 = true, .memory = true });
53}
54
55pub fn syscall4(
56 number: SYS,
57 arg1: syscall_arg_t,
58 arg2: syscall_arg_t,
59 arg3: syscall_arg_t,
60 arg4: syscall_arg_t,
61) u64 {
62 return asm volatile ("syscall"
63 : [ret] "={rax}" (-> u64),
64 : [number] "{rax}" (@backingInt(number)),
65 [arg1] "{rdi}" (arg1),
66 [arg2] "{rsi}" (arg2),
67 [arg3] "{rdx}" (arg3),
68 [arg4] "{r10}" (arg4),
69 : .{ .rcx = true, .r11 = true, .memory = true });
70}
71
72pub fn syscall5(
73 number: SYS,
74 arg1: syscall_arg_t,
75 arg2: syscall_arg_t,
76 arg3: syscall_arg_t,
77 arg4: syscall_arg_t,
78 arg5: syscall_arg_t,
79) u64 {
80 return asm volatile ("syscall"
81 : [ret] "={rax}" (-> u64),
82 : [number] "{rax}" (@backingInt(number)),
83 [arg1] "{rdi}" (arg1),
84 [arg2] "{rsi}" (arg2),
85 [arg3] "{rdx}" (arg3),
86 [arg4] "{r10}" (arg4),
87 [arg5] "{r8}" (arg5),
88 : .{ .rcx = true, .r11 = true, .memory = true });
89}
90
91pub fn syscall6(
92 number: SYS,
93 arg1: syscall_arg_t,
94 arg2: syscall_arg_t,
95 arg3: syscall_arg_t,
96 arg4: syscall_arg_t,
97 arg5: syscall_arg_t,
98 arg6: syscall_arg_t,
99) u64 {
100 return asm volatile ("syscall"
101 : [ret] "={rax}" (-> u64),
102 : [number] "{rax}" (@backingInt(number)),
103 [arg1] "{rdi}" (arg1),
104 [arg2] "{rsi}" (arg2),
105 [arg3] "{rdx}" (arg3),
106 [arg4] "{r10}" (arg4),
107 [arg5] "{r8}" (arg5),
108 [arg6] "{r9}" (arg6),
109 : .{ .rcx = true, .r11 = true, .memory = true });
110}
111
112pub fn clone() callconv(.naked) u64 {
113 asm volatile (
114 \\ movl $56,%%eax // SYS_clone
115 \\ movq %%rdi,%%r11
116 \\ movq %%rdx,%%rdi
117 \\ movq %%r8,%%rdx
118 \\ movq %%r9,%%r8
119 \\ movq 8(%%rsp),%%r10
120 \\ movq %%r11,%%r9
121 \\ andq $-16,%%rsi
122 \\ subq $8,%%rsi
123 \\ movq %%rcx,(%%rsi)
124 \\ syscall
125 \\ testq %%rax,%%rax
126 \\ jz 1f
127 \\ retq
128 \\
129 \\1:
130 );
131 if (builtin.unwind_tables != .none or !builtin.strip_debug_info) asm volatile (
132 \\ .cfi_undefined %%rip
133 );
134 asm volatile (
135 \\ xorl %%ebp,%%ebp
136 \\
137 \\ popq %%rdi
138 \\ callq *%%r9
139 \\ movl %%eax,%%edi
140 \\ movl $60,%%eax // SYS_exit
141 \\ syscall
142 );
143}
144
145pub const restore = restore_rt;
146
147pub fn restore_rt() callconv(.naked) noreturn {
148 asm volatile (
149 \\ movl %[number], %%eax
150 \\ syscall
151 :
152 : [number] "i" (@backingInt(SYS.rt_sigreturn)),
153 );
154}
155
156pub const time_t = i64;
157
158pub const VDSO = struct {
159 pub const CGT_SYM = "__vdso_clock_gettime";
160 pub const CGT_VER = "LINUX_2.6";
161
162 pub const GETCPU_SYM = "__vdso_getcpu";
163 pub const GETCPU_VER = "LINUX_2.6";
164};
165
166pub const ARCH = struct {
167 pub const SET_GS = 0x1001;
168 pub const SET_FS = 0x1002;
169 pub const GET_FS = 0x1003;
170 pub const GET_GS = 0x1004;
171};