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/* $OpenBSD: asm.h,v 1.6 2020/10/22 23:35:43 mortimer Exp $ */
/*
* Copyright (c) 2020 Dale Rahn <drahn@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _POWERPC64_ASM_H_
#define _POWERPC64_ASM_H_
#define _C_LABEL(x) x
#define _ASM_LABEL(x) x
#define _TMP_LABEL(x) .L_ ## x
#define _GEP_LABEL(x) .L_ ## x ## _gep0
#define _LEP_LABEL(x) .L_ ## x ## _lep0
#define _ENTRY(x) \
.text; .align 2; .globl x; .type x,@function; x: \
_GEP_LABEL(x): \
addis %r2, %r12, .TOC.-_GEP_LABEL(x)@ha; \
addi %r2, %r2, .TOC.-_GEP_LABEL(x)@l; \
_LEP_LABEL(x): \
.localentry _C_LABEL(x), _LEP_LABEL(x)-_GEP_LABEL(x);
#if defined(PROF) || defined(GPROF)
# define _PROF_PROLOGUE(y) \
.section ".data"; \
.align 2; \
_TMP_LABEL(y):; \
.long 0; \
.section ".text"; \
mflr %r0; \
addis %r11, %r2, _TMP_LABEL(y)@toc@ha; \
std %r0, 8(%r1); \
addi %r0, %r11, _TMP_LABEL(y)@toc@l; \
bl _mcount;
#else
# define _PROF_PROLOGUE(y)
#endif
#define ENTRY(y) _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE(y)
#define ASENTRY(y) _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE(y)
#define END(y) .size y, . - y
#define STRONG_ALIAS(alias,sym) \
.global alias; .set alias,sym
#define WEAK_ALIAS(alias,sym) \
.weak alias; .set alias,sym
#if defined(_RET_PROTECTOR)
# define RETGUARD_SETUP(x, reg) \
RETGUARD_SYMBOL(x); \
mflr %r0; \
addis reg, %r2, (__retguard_ ## x)@toc@ha; \
ld reg, ((__retguard_ ## x)@toc@l)(reg); \
xor reg, reg, %r0
# define RETGUARD_CHECK(x, reg) \
mflr %r0; \
xor reg, reg, %r0; \
addis %r12, %r2, (__retguard_ ## x)@toc@ha; \
ld %r12, ((__retguard_ ## x)@toc@l)(%r12); \
tdne reg, %r12
# define RETGUARD_SAVE(reg, loc) \
std reg, loc
# define RETGUARD_LOAD(reg, loc) \
ld reg, loc
# define RETGUARD_SYMBOL(x) \
.ifndef __retguard_ ## x; \
.hidden __retguard_ ## x; \
.type __retguard_ ## x,@object; \
.pushsection .openbsd.randomdata.retguard,"aw",@progbits; \
.weak __retguard_ ## x; \
.p2align 3; \
__retguard_ ## x: ; \
.quad 0; \
.size __retguard_ ## x, 8; \
.popsection; \
.endif
#else
# define RETGUARD_SETUP(x, reg)
# define RETGUARD_CHECK(x, reg)
# define RETGUARD_SAVE(reg, loc)
# define RETGUARD_LOAD(reg, loc)
# define RETGUARD_SYMBOL(x)
#endif
#endif /* !_POWERPC64_ASM_H_ */
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