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
62
63
|
/* Test program for byte registers.
Copyright 2010-2017 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <stdio.h>
int data[] = {
0x14131211,
0x24232221,
0x34333231,
0x44434241,
};
int
main (int argc, char **argv)
{
register int eax asm ("eax");
register int ebx asm ("ebx");
register int ecx asm ("ecx");
register int edx asm ("edx");
asm ("mov 0(%0), %%eax\n\t"
"mov 4(%0), %%ebx\n\t"
"mov 8(%0), %%ecx\n\t"
"mov 12(%0), %%edx\n\t"
: /* no output operands */
: "r" (data)
: "eax", "ebx", "ecx", "edx");
asm ("nop" /* first breakpoint here */
/* i386-{byte,word}.exp write eax-edx here.
Tell gcc/clang they're live. */
: "=r" (eax), "=r" (ebx), "=r" (ecx), "=r" (edx)
: /* no inputs */);
asm ("mov %%eax, 0(%0)\n\t"
"mov %%ebx, 4(%0)\n\t"
"mov %%ecx, 8(%0)\n\t"
"mov %%edx, 12(%0)\n\t"
: /* no output operands */
: "r" (data),
/* Mark these as inputs so that gcc/clang won't try to use them as
a temp to build %0. */
"r" (eax), "r" (ebx), "r" (ecx), "r" (edx));
puts ("Bye!"); /* second breakpoint here */
return 0;
}
|
