如何搭建书中程序运行环境（附英文电子书）

🪶 笔记摘要

阅读字号： 16px

1. 将下面程序保存文件名为exit.s
	```
	#PURPOSE: Simple program that exits and returns a
	# status code back to the Linux kernel
	#
	#INPUT: none
	#
	#OUTPUT: returns a status code. This can be viewed
	# by typing
	#
	# echo $?
	#
	# after running the program
	#
	#VARIABLES:
	# %eax holds the system call number
	# (this is always the case)
	#
	# %ebx holds the return status
	#
	.section .data
	.section .text
	.globl _start
	_start:
	movl $1, %eax # this is the linux kernel command
	# number (system call) for exiting
	# a program
	movl $0, %ebx # this is the status number we will
	# return to the operating system.
	# Change this around and it will
	# return different things to
	# echo $?
	int $0x80 # this wakes up the kernel to run
	# the exit command
	```
2. 用 GNU 汇编器将汇编源文件编译成目标文件：
	```
	as exit.s -o exit.o
	```
3. 要链接该文件，请输入命令：
	```
	ld exit.o -o exit
	```
4. 运行 exit 程序，你可以通过输入命令：
	```
	./exit
	```
5. 验证结果，如果你输入以下命令，正常状态它会显示 0：
	```
	echo $?
	```

其他程序也一样调试，这是在linux下操作，不同系统版本按提示完成，ubuntu24版本已默认安装gun汇编器。

如何搭建书中程序运行环境（附英文电子书）

🪶 笔记摘要

笔记附件