function calling convention

1. __stdcall
2. __cdecl
3. __fastcall

vc6.0:
int __stdcall/__cdecl/__fastcall Add (int x, int y)
{
return x+y;
}

void Main ()
{
Add (2,3);
}

1.__stdcall:

1:int __stdcall Add (int x, int y)
2: {
00401020 Push EBP
00401021 mov Ebp,esp
00401023 Sub esp,40h
00401026 push EBX
00401027 push ESI
00401028 Push EDI
00401029 Lea edi,[ebp-40h]
0040102C mov ecx,10h
00401031 mov eax,0cccccccch
00401036 Rep stos dword ptr [edi]
3:return X+y;
00401038 mov eax,dword ptr [ebp+8]
0040103B add Eax,dword ptr [ebp+0ch]
4:}
0040103E Pop EDI
0040103F pop ESI
00401040 pop ebx
00401041 mov esp,ebp
00401043 Pop EBP
00401044 ret 8
5:
6:
7:void Main ()
8: {
00401050 Push EBP
00401051 mov Ebp,esp
00401053 Sub esp,40h
00401056 push EBX
00401057 push ESI
00401058 Push EDI
00401059 Lea edi,[ebp-40h]
0040105C mov ecx,10h
00401061 mov eax,0cccccccch
00401066 Rep stos dword ptr [edi]
9:add (2,3);
00401068 Push 3
0040106A Push 2
0040106C Call @ILT +0 (add) (00401005)
10:}
00401071 Pop EDI
00401072 pop ESI
00401073 pop ebx
00401074 Add esp,40h
00401077 CMP EBP,ESP
00401079 call __chkesp (00401090)
0040107E mov esp,ebp
00401080 Pop EBP
00401081 ret

00401005 jmp Add (00401020)

2.__CDECL:

1:int __cdecl Add (int x, int y)
2: {
00401020 Push EBP
00401021 mov Ebp,esp
00401023 Sub esp,40h
00401026 push EBX
00401027 push ESI
00401028 Push EDI
00401029 Lea edi,[ebp-40h]
0040102C mov ecx,10h
00401031 mov eax,0cccccccch
00401036 Rep stos dword ptr [edi]
3:return X+y;
00401038 mov eax,dword ptr [ebp+8]
0040103B add Eax,dword ptr [ebp+0ch]
4:}
0040103E Pop EDI
0040103F pop ESI
00401040 pop ebx
00401041 mov esp,ebp
00401043 Pop EBP
00401044 ret
5:
6:
7:void Main ()
8: {
00401050 Push EBP
00401051 mov Ebp,esp
00401053 Sub esp,40h
00401056 push EBX
00401057 push ESI
00401058 Push EDI
00401059 Lea edi,[ebp-40h]
0040105C mov ecx,10h
00401061 mov eax,0cccccccch
00401066 Rep stos dword ptr [edi]
9:add (2,3);
00401068 Push 3
0040106A Push 2
0040106C Call @ILT +10 (add) (0040100F)
00401071   add          esp,8
10:  }
00401074   pop          EDI
00401075   pop         ESI
00401076    pop         ebx
00401077   add          esp,40h
0040107a   cmp          EBP,ESP
0040107c   call        __chkesp (00401090)
00401081   mov         esp,ebp
00401083   Pop          EBP
00401084   ret

0040100f   jmp          Add (00401020)

3.__fastcall

1:int __fastcall Add (int x, int y)
2: {
00401020 Push EBP
00401021 mov Ebp,esp
00401023 Sub esp,48h
00401026 push EBX
00401027 push ESI
00401028 Push EDI
00401029 push ECX
0040102A Lea edi,[ebp-48h]
0040102D mov ecx,12h
00401032 mov eax,0cccccccch
00401037 Rep stos dword ptr [edi]
0040103A mov dword ptr [Ebp-8],edx
0040103D mov dword ptr [EBP-4],ECX
3:return X+y;
00401040 mov eax,dword ptr [ebp-4]
00401043 add Eax,dword ptr [ebp-8]
4:}
00401046 Pop EDI
00401047 pop ESI
00401048 pop ebx
00401049 mov esp,ebp
0040104B Pop EBP
0040104C ret
5:
6:
7:void Main ()
8: {
00401050 Push EBP
00401051 mov Ebp,esp
00401053 Sub esp,40h
00401056 push EBX
00401057 push ESI
00401058 Push EDI
00401059 Lea edi,[ebp-40h]
0040105C mov ecx,10h
00401061 mov eax,0cccccccch
00401066 Rep stos dword ptr [edi]
9:add (2,3);
movedx,3
0040106D 00401072 Call @ILT +15 (add) (00401014)
10:}
00401077 Pop EDI
00401078 pop ESI
00401079 pop ebx
0040107A Add esp,40h
0040107D CMP EBP,ESP
0040107F call __chkesp (00401090)
00401084 mov esp,ebp
00401086 Pop EBP
00401087 ret

00401014 jmp Add (00401020)
====================================================================================
1:int __fastcall Add (int x, int y, int z)
2: {
0040d480 Push EBP
0040d481 mov Ebp,esp
0040d483 Sub esp,48h
0040d486 push EBX
0040d487 push ESI
0040d488 Push EDI
0040d489 push ECX
0040d48a Lea edi,[ebp-48h]
0040D48D mov ecx,12h
0040D492 mov eax,0cccccccch
0040d497 Rep stos dword ptr [edi]
0040d499 pop ECX
0040D49A mov dword ptr [Ebp-8],edx
0040D49D mov dword ptr [EBP-4],ECX
3:return x+y+z;
0040D4A0 mov eax,dword ptr [ebp-4]
0040D4A3 add Eax,dword ptr [ebp-8]
0040D4A6 add Eax,dword ptr [ebp+8]
4:}
0040D4A9 Pop EDI
0040D4AA pop ESI
0040D4AB pop ebx
0040D4AC mov esp,ebp
0040d4ae Pop EBP
0040D4AF RET 4
5:
6:
7:void Main ()
8: {
00401050 Push EBP
00401051 mov Ebp,esp
00401053 Sub esp,40h
00401056 push EBX
00401057 push ESI
00401058 Push EDI
00401059 Lea edi,[ebp-40h]
0040105C mov ecx,10h
00401061 mov eax,0cccccccch
00401066 Rep stos dword ptr [edi]
9:add (2,3,4);
Push4
0040106A mov edx,3
0040106F mov ecx,2
00401074 Call @ILT +20 (add) (00401019)
10:}
00401079 Pop EDI
0040107A pop ESI
0040107B pop ebx
0040107C Add esp,40h
0040107F CMP EBP,ESP
00401081 call __chkesp (00401090)
00401086 mov esp,ebp
00401088 Pop EBP
00401089 ret

00401019 jmp Add (0040d480)

function calling convention