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[C++, inline ASM] Getting the value of EIP

 
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LolSalad
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PostPosted: Sun May 17, 2009 6:07 am    Post subject: [C++, inline ASM] Getting the value of EIP Reply with quote
Code:
#include <iostream>
#include <windows.h>

using std::cout;
using std::cin;

#define getEIP(ev) __asm {   \
   __asm call get_eip        \
   __asm sub eax, 5          \
   __asm mov ev, eax         \
}

int main(int argc, char** args) {
   void* eipval;
   getEIP(eipval);
   cout << eipval;
   cin.sync();
   cin.ignore();
   return EXIT_SUCCESS;
   __asm {
      get_eip:
         mov eax, [esp]
         ret
   }
}


This works, but I have to create the get_eip label after the return function in any functions that I want to use it in. Is there a more efficient way?
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&Vage
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PostPosted: Sun May 17, 2009 6:49 am    Post subject: Reply with quote
http://msdn.microsoft.com/en-us/library/64ez38eh(VS.71).aspx
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tombana
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PostPosted: Sun May 17, 2009 6:53 am    Post subject: Reply with quote
if it's code for in a static executable (so no relocations or whatever) then I think you can do: __asm mov my_var, $
$ will be replaced with the address of that instruction when compiled.
Otherwise you'll have to do something like:
Code:

__asm{
call blabla
blabla:
mov eax, [esp]
mov my_variable, eax
sub esp, 4
}
//now you have the eip of the 'call blabla' instruction in my_variable
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