内联汇编的使用，函数返回值的外部调用

#include "windows.h"
#include "stdio.h"



_declspec(naked) void Fun()
{
    _asm
    {
        push ebp;
        mov ebp ,esp;
        sub esp ,0x40;
        push esi;
        push edi;
        push ecx;
        mov eax,0xcccccccc;
        mov ecx,0x10;
        lea edi,[ebp-0x40];
        REP STOS DWORD PTR ES:[EDI];
        mov eax,[ebp+0x8];
        add eax,[ebp+0xc];
        pop ecx;
        pop edi;
        pop esi;
        mov esp,ebp;
        pop ebp;
        
        ret;
    }
}


void main()
{
    int  arg =0;
    _asm
    {
        push 0x3;
        push 0x5;
        call Fun;
        mov DWORD ptr [arg],eax;  //赋值到内存地址
        add esp,0x8; //外平栈，自己恢复堆栈

    }
    printf("res=%d\n",arg);
    getchar();
}