Ok it works but what's with the mov esi, esp thing?
>>add esp, 4
That would be the stack clean up am I right?
thanks :)
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Question
_asm call puts in VC++ 2005
Hello experts
I'm trying to use standart C functions from the VC inline assembler but the program crashes at run time.
Here is the code:
#include <stdio.h>
char hello[] = "Hello";
void main(void)
{
__asm
{
mov eax, offset hello
push eax
call puts
pop ebx
}
}
Links to good tutorials on inline assembler in VC would be appreciated too.
thanks in advance
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Answers
Looking at your code, I see that you use incorrect calling convention. puts function is defined as:
int __cdecl puts(__in_z const char * _Str);
__cdecl calling convention description:
http://msdn2.microsoft.com
"Calling function pops the arguments from the stack" - this is add esp, 4
mov esi,esp
I guess this is function return address. Read details here:
http://webster.cs.ucr.edu/
You can learn many things reading C++ compiler output. To get more details, read "Art of Assembly Language" book, 16-bits Edition, this is core Assembly, and make correction for 32-bits edition.
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by: AlexFMPosted on 2006-09-19 at 07:01:32ID: 17551931
char hello[] = "Hello";
int _tmain(int argc, _TCHAR* argv[])
{
__asm
{
mov esi,esp
push offset hello
call dword ptr [puts]
add esp,4
}
return 0;
}
http://www.microsoft.com/m
__asm block is copied from C++ code produced by compiler:
puts(hello);
004113AE mov esi,esp
004113B0 push offset hello (417000h)
004113B5 call dword ptr [__imp__puts (4182B8h)]
004113BB add esp,4