Almost got my variadic RPC working. But pushing on the stack isn't working for me. If anyone knows assembly, can they tell me what I'm doing wrong?
char a=1; unsigned long long e=5;(I serialize this into an array in reverse order, and expand the char to 4 bytes)
- out 0x0012fd0c "" char [256]
[0] 5 '?' char
[1] 0 char
[2] 0 char
[3] 0 char
[4] 0 char
[5] 0 char
[6] 0 char
[7] 0 char
[8] 1 '?' char
[9] 0 char
[10] 0 char
[11] 0 char
I then push that array onto the stack, and do the function call.
numBytes in this case is 12:
int loopCount = numBytes/4;
__asm
{
// Allocate stack
sub esp,numBytes
// Number of times to move MIN_FUNC_STACK_ALIGNMENT bytes
mov ecx,loopCount
// Load variable source address for movsd instruction.
lea esi,stack
// Load variable dest address
mov edi,esp
// Copy data to stack, 4 bytes at a time, until ecx is 0
rep movsd
// Call function
call functionPtr
// Deallocate stack
add esp,numBytes
}
Here's the function I'm calling:
void _cdecl func2(char a, unsigned long long e)
{
// Test param injection, optional in parameter list
printf("%i %i\n", a, (int) e);
}
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