Created
October 3, 2011 17:01
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#include <string.h> | |
#include <vector> | |
typedef struct { | |
unsigned long eip, esp, ebp, ebx, edi, esi; | |
void *stack; | |
int length; | |
} myjmp_buf; | |
_declspec(naked) int _fastcall mysetjmp(myjmp_buf *jbuf) { | |
_asm { | |
pop edx | |
mov [ecx ], edx | |
mov [ecx+ 4], esp | |
mov [ecx+ 8], ebp | |
mov [ecx+12], ebx | |
mov [ecx+16], edi | |
mov [ecx+20], esi | |
xor eax, eax | |
mov [ecx+24], eax | |
mov [ecx+28], eax | |
jmp edx | |
} | |
} | |
_declspec(naked) void _fastcall mylongjmp(myjmp_buf *jbuf, int value) { | |
_asm { | |
mov eax, edx | |
mov edx, ecx | |
mov esp, [edx+ 4] | |
mov edi, esp | |
mov esi, [edx+24] | |
mov ecx, [edx+28] | |
cld | |
rep movsb | |
mov ebp, [edx+ 8] | |
mov ebx, [edx+12] | |
mov edi, [edx+16] | |
mov esi, [edx+20] | |
jmp dword ptr [edx] | |
} | |
} | |
void save_stack(std::vector<char> *dest, unsigned long last, myjmp_buf *callee) { | |
callee->length = last - callee->esp; | |
dest->resize(callee->length); | |
callee->stack = &(*dest)[0]; | |
memcpy(callee->stack, (void *)callee->esp, callee->length); | |
} | |
#include <stdio.h> | |
myjmp_buf jb1, jb2; | |
std::vector<char> stack; | |
void test() { | |
for (int i = 1; i <= 10; i++) | |
if (mysetjmp(&jb2) == 0) { | |
save_stack(&stack, jb1.esp, &jb2); | |
mylongjmp(&jb1, i); | |
} | |
} | |
int main() { | |
int value = mysetjmp(&jb1); | |
if (value == 0) { | |
test(); | |
printf("end\n"); | |
} else if (value > 0) { | |
printf("%d\n", value); | |
mylongjmp(&jb2, 1); | |
} | |
} |
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