1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */
.global _longjmp
.global longjmp
.type _longjmp,%function
.type longjmp,%function
_longjmp:
longjmp:
mov %rsi,%rax /* val will be longjmp return */
test %rax,%rax
jnz .L0
inc %rax /* if val==0, val=1 per longjmp semantics */
.L0:
movq (%rdi),%rbx /* rdi is the jmp_buf, restore regs from it */
movq 8(%rdi),%rbp
movq 16(%rdi),%r12
movq 24(%rdi),%r13
movq 32(%rdi),%r14
movq 40(%rdi),%r15
movq 48(%rdi),%rdx /* this ends up being the stack pointer */
mov %rdx,%rsp
movq 56(%rdi),%rdx /* this is the instruction pointer */
jmp *%rdx /* goto saved address without altering rsp */
.size _longjmp,.-_longjmp
.size longjmp,.-longjmp
|
