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Jeff Dike13c06be2006-09-25 23:32:59 -07001#
2# arch/i386/setjmp.S
3#
4# setjmp/longjmp for the i386 architecture
5#
6
7#
8# The jmp_buf is assumed to contain the following, in order:
9# %ebx
10# %esp
11# %ebp
12# %esi
13# %edi
14# <return address>
15#
16
17 .text
18 .align 4
19 .globl setjmp
20 .type setjmp, @function
21setjmp:
22#ifdef _REGPARM
23 movl %eax,%edx
24#else
25 movl 4(%esp),%edx
26#endif
27 popl %ecx # Return address, and adjust the stack
28 xorl %eax,%eax # Return value
29 movl %ebx,(%edx)
30 movl %esp,4(%edx) # Post-return %esp!
31 pushl %ecx # Make the call/return stack happy
32 movl %ebp,8(%edx)
33 movl %esi,12(%edx)
34 movl %edi,16(%edx)
35 movl %ecx,20(%edx) # Return address
36 ret
37
38 .size setjmp,.-setjmp
39
40 .text
41 .align 4
42 .globl longjmp
43 .type longjmp, @function
44longjmp:
45#ifdef _REGPARM
46 xchgl %eax,%edx
47#else
48 movl 4(%esp),%edx # jmp_ptr address
49 movl 8(%esp),%eax # Return value
50#endif
51 movl (%edx),%ebx
52 movl 4(%edx),%esp
53 movl 8(%edx),%ebp
54 movl 12(%edx),%esi
55 movl 16(%edx),%edi
56 jmp *20(%edx)
57
58 .size longjmp,.-longjmp