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Code Issues Releases Wiki Activity

Change add_stub code to also work without -fomit-frame-pointer

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21381 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2006-11-29 12:20:05 +00:00
parent b2dce56aad
commit 383008da88
1 changed files with 12 additions and 49 deletions
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61
loader/win32.c
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@ -5272,67 +5272,30 @@ struct libs libraries[]={
static void ext_stubs(void)
{
// expects:
// ax position index
// cx address of printf function
#if 1
__asm__ __volatile__
(
"push %%edx \n\t"
"movl $0xdeadbeef, %%eax \n\t"
"movl $0xdeadbeef, %%edx \n\t"
"shl $5, %%eax \n\t" // ax * 32
"addl $0xdeadbeef, %%eax \n\t" // overwrite export_names
"pushl %%eax \n\t"
"pushl $0xdeadbeef \n\t" // overwrite called_unk
"call *%%edx \n\t" // printf (via dx)
"addl $8, %%esp \n\t"
"xorl %%eax, %%eax \n\t"
"pop %%edx \n\t"
:
:
: "eax"
);
#else
__asm__ __volatile__
(
"push %%edx \n\t"
"movl $0, %%eax \n\t"
"movl $0, %%edx \n\t"
"shl $5, %%eax \n\t" // ax * 32
"addl %0, %%eax \n\t"
"pushl %%eax \n\t"
"pushl %1 \n\t"
"call *%%edx \n\t" // printf (via dx)
"addl $8, %%esp \n\t"
"xorl %%eax, %%eax \n\t"
"pop %%edx \n\t"
::"m"(*export_names), "m"(*called_unk)
: "memory", "edx", "eax"
);
#endif
volatile int idx = 0xdeadabcd;
printf("Called unk_%s\n", export_names[idx]);
}
//static void add_stub(int pos)
static int pos=0;
static char extcode[20000];// place for 200 unresolved exports
static const char* called_unk = "Called unk_%s\n";
static void* add_stub(void)
{
int i;
// generated code in runtime!
char* answ = (char*)extcode+pos*0x30;
memcpy(answ, ext_stubs, 0x2f); // 0x2c is current size
//answ[4] = 0xb8; // movl $0, eax (0xb8 0x00000000)
*((int*) (answ + 5)) = pos;
//answ[9] = 0xba; // movl $0, edx (0xba 0x00000000)
*((long*) (answ + 10)) = (long)printf;
//answ[17] = 0x05; // addl $0, eax (0x05 0x00000000)
*((long*) (answ + 18)) = (long)export_names;
//answ[23] = 0x68; // pushl $0 (0x68 0x00000000)
*((long*) (answ + 24)) = (long)called_unk;
for (i = 0; i < 0x30 - 3; i++) {
if (*(int*)(answ + i) == 0xdeadabcd)
break;
}
if (*(int*)(answ + i) != 0xdeadabcd) {
printf("magic code not found in ext_subs, expect crash\n");
return NULL;
}
*(int*)(answ + i) = pos;
pos++;
return (void*)answ;
}