cosmopolitan/libc/nexgen32e/setjmp.S

43 lines
2.3 KiB
ArmAsm

/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
vi: set et ft=asm ts=8 tw=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.h"
/ Saves caller CPU state to cacheline.
/
/ @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()
setjmp: 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
.endfn setjmp,globl
.source __FILE__