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crUsAdEr
April 8th, 2004, 04:06
OK, i wrote a function in C++ which doesn't do anything much, and here is the compiled results
Code:


.text:00013641 55                  push  ebp

.text:00013642 8B EC               mov   ebp, esp

.text:00013644 53                  push  ebx

.text:00013645 56                  push  esi

.text:00013646 57                  push  edi

.text:00013647 60                  pusha

.text:00013648 83 3D A8 16 04 00+  cmp   dword_416A8, 0

.text:0001364F 74 06               jz    short loc_13657

.text:00013651 8B 45 08            mov   eax, [ebp+arg_0]

.text:00013654 80 20 EF            and   byte ptr [eax], 0EFh

.text:00013657                   

.text:00013657                   loc_13657:                    ; CODE XREF: sub_13641+Ej

.text:00013657 61                  popa

.text:00013658 5F                  pop   edi

.text:00013659 5E                  pop   esi

.text:0001365A 5B                  pop   ebx

.text:0001365B 5D                  pop   ebp


The question is how do I tell the compiler to skip all the push esi, pop esi...
All i needed was the pusha and popa...

So what directive do I need?

Thanks
tom324
April 8th, 2004, 15:27
Check compiler options and set optimization level to max.

Tom
disavowed
April 8th, 2004, 18:34
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/msmod_25.asp ("http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/msmod_25.asp")
TQN
April 8th, 2004, 21:31
Hi crUsAdEr !
If you use VC++, you can declare a function with __declspec(naked). For functions declared with the naked attribute, the compiler generates code without prolog and epilog code.
Regards
disavowed
April 8th, 2004, 23:00
tqn: see my post directly above yours
crUsAdEr
April 9th, 2004, 01:02
Thanks, disavowed and everyone else ...
I thought it was naked something but wasnt sure