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
|
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
unsigned int do32 ( unsigned int x )
{
unsigned int* y = malloc(sizeof(unsigned int));
unsigned int* z = malloc(sizeof(unsigned int));
unsigned int t;
assert(y);
assert(z);
y[0] = x;
__asm__ __volatile__(
"pushl %0\n\t"
"pushl %1\n\t"
"popl %%ebx\n\t"
"popl %%eax\n\t"
"pushl 0(%%eax)\n\t"
"popl 0(%%ebx)"
: /*OUT*/
: /*IN*/ "r"(y), "r"(z)
: /*TRASH*/ "memory", "eax", "ebx"
);
t = z[0];
free(y);
free(z);
return t;
}
unsigned short do16 ( unsigned short x )
{
unsigned short* y = malloc(sizeof(unsigned short));
unsigned short* z = malloc(sizeof(unsigned short));
unsigned short t;
assert(y);
assert(z);
y[0] = x;
__asm__ __volatile__(
"pushl %0\n\t"
"pushl %1\n\t"
"popl %%ebx\n\t"
"popl %%eax\n\t"
"pushw 0(%%eax)\n\t"
"popw 0(%%ebx)"
: /*OUT*/
: /*IN*/ "r"(y), "r"(z)
: /*TRASH*/ "memory", "eax", "ebx"
);
t = z[0];
free(y);
free(z);
return t;
}
int main ( void )
{
printf("do32: 0x%08X\n", do32(0xCafeBabe) );
printf("do16: 0x%08X\n", (unsigned int)do16(0xfeBa) );
return 0;
}
|
