#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
void f1();
void f2();
int main();
unsigned long f1_ret;
void
f1(){
char c;
int i;
printf("0x%x,0x%x\n",(unsigned int) &c,(unsigned int)&i);
unsigned long local_arg_addr =(unsigned long) &c;
printf("f1 before called\n");
f1_ret=*(unsigned long *)(local_arg_addr+1+4);
*(unsigned long *)(local_arg_addr+1+4) =(unsigned long) f2;
printf("f1 after called\n");
}
void
f2(){
char c;
printf("f2 before called\n");
*(unsigned long *)(&c+1+4) = f1_ret;
printf("f2 after called\n");
}
int
main(){
char c;
int i;
printf("&c=0x%x,&i=0x%x\n",(unsigned int) &c,(unsigned int)&i);
printf("main before called\n");
f1();
printf("main after called\n");
exit(1);//这里使用exit,还暂时不能使用return ，因为main堆栈没有完全建立好，待完善
}
程序运行结果:
&c=0xbff87f83,&i=0xbff87f7c
main before called
0xbff87f57,0xbff87f50
f1 before called
f1 after called
f2 before called
f2 after called
main after called
通过这个实验分析linux堆栈结构
通过堆栈结构可以看出linux C语言几个重要的特性：
1 参数自右压栈
2 栈是有低地址向高地址增加
f1的堆栈示意如下：
