Linux下C语言嵌入AT&T汇编

main.c

#include <stdio.h>
int a;
int main()
{
	asm(
		"pusha #this is a note\n"
		"movl $1,a\n" //a is a memory address
		"movl a,%eax\n"
		"addl $2,%eax\n"
		"movl %eax,a\n"
		"popa"
	);
	printf("a=%d\n",a);
	return 0;
}

编译：gcc main.c -o main
运行结果为a=3
注意：C语言中的全局变量名，在内嵌汇编代码中被引用时表示的是这个变量的内存地址