1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
/* ---------------------------------------------- */
/* chkstk86.s */
#include "../../config.h"
/* ---------------------------------------------- */
#ifndef TCC_TARGET_X86_64
/* ---------------------------------------------- */
.globl __chkstk
__chkstk:
xchg (%esp),%ebp /* store ebp, get ret.addr */
push %ebp /* push ret.addr */
lea 4(%esp),%ebp /* setup frame ptr */
push %ecx /* save ecx */
mov %ebp,%ecx
P0:
sub $4096,%ecx
test %eax,(%ecx)
sub $4096,%eax
cmp $4096,%eax
jge P0
sub %eax,%ecx
test %eax,(%ecx)
mov %esp,%eax
mov %ecx,%esp
mov (%eax),%ecx /* restore ecx */
jmp *4(%eax)
/* ---------------------------------------------- */
#else
/* ---------------------------------------------- */
.globl __chkstk
__chkstk:
xchg (%rsp),%rbp /* store ebp, get ret.addr */
push %rbp /* push ret.addr */
lea 8(%rsp),%rbp /* setup frame ptr */
push %rcx /* save ecx */
mov %rbp,%rcx
movslq %eax,%rax
P0:
sub $4096,%rcx
test %rax,(%rcx)
sub $4096,%rax
cmp $4096,%rax
jge P0
sub %rax,%rcx
test %rax,(%rcx)
mov %rsp,%rax
mov %rcx,%rsp
mov (%rax),%rcx /* restore ecx */
jmp *8(%rax)
/* ---------------------------------------------- */
#endif
/* ---------------------------------------------- */
|
