花指令

g++内联(x64)

int add1(int x,int y)
{
    return x+y;
}
int main()
{
    int x =0,y=0;
    scanf("%d %d",&x,&y);
    asm(
        ".globl _start\n\t"
        "_start:"
        "call _sec\n\t");
    asm(
        ".globl _sec\n\t"
        "_sec:"
        "call _thr\n\t"//下方都是无意义的代码
        "call 0xef\n\t"//只增加一个call时ida无变化
        "mov 4,%%rax\n\t"//增加对rax修改时ida无变化
        "add $4,%1\n\t"//增加对参数修改时ida无变化
        "push %%rsp\n\t"//多个push只提示堆栈不平衡ida无变化
        "push %%rsp\n\t"
        "push %%rsp\n\t"
        "push %%rsp\n\t"
        "ret"//增加无意义的ret ida无法识别
        :"+r"(x)
    );    
    asm(  ".globl _sec\n\t"
        "_thr:"
        "add $16,%esp\n\t"
    );
    printf("%d",add1(x,y));
}

cl内联(x86)

#include<stdio.h>
int add1(int x, int y)
{
    return x + y;
}
int main()
{
    int a = 1, b = 2;
    __asm {
        call c1;
        push eax;
        push ebx;
    c1:
        call c2;
        push eax;
        pop eax;
    c2:
        add esp,8;
    }
    printf("%d", add1(a, b));

}

只进行无意义的push操作时ida直接无法识别