/
setjmp.S
65 lines (64 loc) · 2.71 KB
/
setjmp.S
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│ vi: set noet ft=asm ts=8 sw=8 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or 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. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
// Saves cpu state.
//
// @param rdi points to jmp_buf
// @return rax 0 when set and !0 when longjmp'd
// @returnstwice
// @assume system five nexgen32e abi conformant
// @note code built w/ microsoft abi compiler can't call this
// @see longjmp(), gclongjmp()
.ftrace1
setjmp:
.ftrace2
_setjmp:
#ifdef __x86_64__
lea 8(%rsp),%rax
mov %rax,(%rdi)
mov %rbx,8(%rdi)
mov %rbp,16(%rdi)
mov %r12,24(%rdi)
mov %r13,32(%rdi)
mov %r14,40(%rdi)
mov %r15,48(%rdi)
mov (%rsp),%rax
mov %rax,56(%rdi)
xor %eax,%eax
ret
#elif defined(__aarch64__)
mov x2,sp
stp x29,x30,[x0,#0]
stp x2,x22,[x0,#16]
stp x23,x24,[x0,#32]
stp x25,x26,[x0,#48]
stp x27,x28,[x0,#64]
stp x19,x20,[x0,#80]
str x21,[x0,#104]
stp d8,d9,[x0,#112]
stp d10,d11,[x0,#128]
stp d12,d13,[x0,#144]
stp d14,d15,[x0,#160]
mov x0,#0
ret
#else
#error "unsupported architecture"
#endif
.endfn _setjmp,globl
.endfn setjmp,globl