| 1 | /* $OpenBSD: asm.h,v 1.7 2022/12/07 23:25:59 guenther Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2020 Dale Rahn <drahn@openbsd.org> |
| 5 | * |
| 6 | * Permission to use, copy, modify, and distribute this software for any |
| 7 | * purpose with or without fee is hereby granted, provided that the above |
| 8 | * copyright notice and this permission notice appear in all copies. |
| 9 | * |
| 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | */ |
| 18 | |
| 19 | #ifndef _POWERPC64_ASM_H_ |
| 20 | #define _POWERPC64_ASM_H_ |
| 21 | |
| 22 | #define _C_LABEL(x) x |
| 23 | #define _ASM_LABEL(x) x |
| 24 | |
| 25 | #define _TMP_LABEL(x) .L_ ## x |
| 26 | #define _GEP_LABEL(x) .L_ ## x ## _gep0 |
| 27 | #define _LEP_LABEL(x) .L_ ## x ## _lep0 |
| 28 | |
| 29 | #define _ENTRY(x) \ |
| 30 | .text; .align 2; .globl x; .type x,@function; x: \ |
| 31 | _GEP_LABEL(x): \ |
| 32 | addis %r2, %r12, .TOC.-_GEP_LABEL(x)@ha; \ |
| 33 | addi %r2, %r2, .TOC.-_GEP_LABEL(x)@l; \ |
| 34 | _LEP_LABEL(x): \ |
| 35 | .localentry x, _LEP_LABEL(x)-_GEP_LABEL(x); |
| 36 | |
| 37 | #if defined(PROF) || defined(GPROF) |
| 38 | # define _PROF_PROLOGUE(y) \ |
| 39 | .section ".data"; \ |
| 40 | .align 2; \ |
| 41 | _TMP_LABEL(y):; \ |
| 42 | .long 0; \ |
| 43 | .section ".text"; \ |
| 44 | mflr %r0; \ |
| 45 | addis %r11, %r2, _TMP_LABEL(y)@toc@ha; \ |
| 46 | std %r0, 8(%r1); \ |
| 47 | addi %r0, %r11, _TMP_LABEL(y)@toc@l; \ |
| 48 | bl _mcount; |
| 49 | #else |
| 50 | # define _PROF_PROLOGUE(y) |
| 51 | #endif |
| 52 | |
| 53 | #define ENTRY(y) _ENTRY(y); _PROF_PROLOGUE(y) |
| 54 | #define ASENTRY(y) _ENTRY(y); _PROF_PROLOGUE(y) |
| 55 | #define END(y) .size y, . - y |
| 56 | |
| 57 | #define STRONG_ALIAS(alias,sym) \ |
| 58 | .global alias; .set alias,sym |
| 59 | #define WEAK_ALIAS(alias,sym) \ |
| 60 | .weak alias; .set alias,sym |
| 61 | |
| 62 | #if defined(_RET_PROTECTOR) |
| 63 | # define RETGUARD_SETUP(x, reg) \ |
| 64 | RETGUARD_SYMBOL(x); \ |
| 65 | mflr %r0; \ |
| 66 | addis reg, %r2, (__retguard_ ## x)@toc@ha; \ |
| 67 | ld reg, ((__retguard_ ## x)@toc@l)(reg); \ |
| 68 | xor reg, reg, %r0 |
| 69 | # define RETGUARD_CHECK(x, reg) \ |
| 70 | mflr %r0; \ |
| 71 | xor reg, reg, %r0; \ |
| 72 | addis %r12, %r2, (__retguard_ ## x)@toc@ha; \ |
| 73 | ld %r12, ((__retguard_ ## x)@toc@l)(%r12); \ |
| 74 | tdne reg, %r12 |
| 75 | # define RETGUARD_SAVE(reg, loc) \ |
| 76 | std reg, loc |
| 77 | # define RETGUARD_LOAD(reg, loc) \ |
| 78 | ld reg, loc |
| 79 | # define RETGUARD_SYMBOL(x) \ |
| 80 | .ifndef __retguard_ ## x; \ |
| 81 | .hidden __retguard_ ## x; \ |
| 82 | .type __retguard_ ## x,@object; \ |
| 83 | .pushsection .openbsd.randomdata.retguard,"aw",@progbits; \ |
| 84 | .weak __retguard_ ## x; \ |
| 85 | .p2align 3; \ |
| 86 | __retguard_ ## x: ; \ |
| 87 | .quad 0; \ |
| 88 | .size __retguard_ ## x, 8; \ |
| 89 | .popsection; \ |
| 90 | .endif |
| 91 | #else |
| 92 | # define RETGUARD_SETUP(x, reg) |
| 93 | # define RETGUARD_CHECK(x, reg) |
| 94 | # define RETGUARD_SAVE(reg, loc) |
| 95 | # define RETGUARD_LOAD(reg, loc) |
| 96 | # define RETGUARD_SYMBOL(x) |
| 97 | #endif |
| 98 | |
| 99 | |
| 100 | #endif /* !_POWERPC64_ASM_H_ */ |