<二>从指令角度了解函数堆栈调用过程

代码

#include <iostream>
using namespace std;
int sum(int a,int b){	
	int temp=0;
	temp=  a +b;
	return temp;	
}

int main(){	
	int a =10;
	int b=20;
	int ret =sum(a,b);
	return 0;
}

以上代码需要了解的2个问题:
问题1:main函数调用sum,sum执行完成以后,怎么知道回到哪个函数中?
问题2:sum函数执行完后,回到main后,怎么知道从哪一行指令继续执行的？
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此时 esp ，ebp 又指向了main函数的栈底指针和栈顶指针
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