在C语言中调用汇编函数

 

#plus1.s
.globl plus1
.section .text
plus1:
    pushl %ebp
    movl %esp, %ebp
    pushl %ebx

    movl 8(%ebp), %ebx
    movl (%ebx), %ecx
    addl $1, %ecx
    movl %ecx, (%ebx)

    popl %ebx
    leave
    ret

 

 

/*
 *plus.c
 */
#include <stdio.h>
int main()
{
    int x;
    x = 1;
    plus1(&x);
    printf("%d\n", x);
    return 0;
}

 

 

/*
 *编译命令
 */
/*
 * as -o plus1.o plus1.s
 * gcc -o plus plus.c plus1.o
 */