最近在拜读《程序员的自我修养-链接,装载与库》一书，书中给出了一个没有main函数的HelloWorld程序。代码如下（PS：强烈推荐此书！）

TinyHelloWorld.c

char *str = "Hello World!\n";

void print()
{
	asm("movl $13,%%edx \n\t"
			"movl %0,%%ecx \n\t"
			"movl $0,%%ebx\n\t"
			"movl $4,%%eax \n\t"
			"int $0x80	\n\t"
			::"r"(str):"edx","ecx","ebx");
}

void exit()
{
	asm("movl $42,%ebx \n\t"
			"movl $1,%eax \n\t"
			"int $0x80	\n\t"
	);
}

void nomain()
{
	print();
	exit();
}