summaryrefslogtreecommitdiff
path: root/src/setjmp/x32/setjmp.s
blob: d95e4853558f73329037c9057d758e73bc9be8d9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
/* Copyright 2011-2012 Nicholas J. Kain, licensed under standard MIT license */
.global __setjmp
.global _setjmp
.global setjmp
.type __setjmp,@function
.type _setjmp,@function
.type setjmp,@function
__setjmp:
_setjmp:
setjmp:
	mov %rbx,(%rdi)         /* rdi is jmp_buf, move registers onto it */
	mov %rbp,8(%rdi)
	mov %r12,16(%rdi)
	mov %r13,24(%rdi)
	mov %r14,32(%rdi)
	mov %r15,40(%rdi)
	lea 8(%rsp),%rdx        /* this is our rsp WITHOUT current ret addr */
	mov %rdx,48(%rdi)
	mov (%rsp),%rdx         /* save return addr ptr for new rip */
	mov %rdx,56(%rdi)
	xor %eax,%eax           /* always return 0 */
	ret