用arm-linux-gdb调试ARM上的应用程序
我根据arm-linux-gdb的调试对象，把调试分为二大类。即底层代码的调试，如u-boot、裸机程序等；或者应用程序的调试，即elf格式的可执行文件。根据我的经验，应用程序的调试相对要容易很多。下面，详细阐述调试经历……
应用篇：用arm-linux-gdb调试应用程序
开发机，即我电脑虚拟机中的ubuntu；目标机，即跑有linux系统的arm开发板。开发机和目标机通过网线连接在一个局域网内，一个网段，确保相互要ping得通。
在开发机中，通过minicom、ssh或者telnet登录开发板，要能看到开发板的文件系统。步骤如下：（ubuntu的IP是192.168.16.200， arm板的IP是192.168.16.40，两者均使用2015端口通信）
【1 打开终端，远程登录开发板】
wuxian@ubuntu:~$ ssh [email protected]
[email protected]'s password: 123
#
【2 另启终端，编译elf可执行文件】
wuxian@ubuntu:~$ touch hello.c
1 #include
2
3 intmain(int argc, char *argv[])
4 {
5 for(inti=0; i<100; i++)
6 {
7 printf("hello,world!\n");
8 }
9 return0;
11 }
wuxian@ubuntu:~$ arm-linux-gcc -g hello.c -o hello --std=c99
【3 拷贝文件到目标开发板】
wuxian@ubuntu:~$ scp ./hello [email protected]:/root
[email protected]'s password:
hello 100%6200 6.1KB/s 00:00
【4 上目标机查看拷贝情况】
# ls
hello
# pwd
/root
#
【5 在目标机上打开gdbserver】准备为客户端arm-linux-gdb服务
# gdbserver 192.168.16.200:2015 hello //192.168.16.200是开发机的ip，2015是监听端口，
Process hello created; pid = 27991 //提示信息
Listening on port 2015
【6 在开发机上打开arm-linux-gdb】准备调试
wuxian@ubuntu:/opt/arm/4.3.2/bin$ ./arm-linux-gdb ~/hello
GNU gdb (Sourcery G++ Lite 2008q3-72)6.8.50.20080821-cvs
Copyright (C) 2008 Free SoftwareFoundation, Inc.
License GPLv3+: GNU GPL version 3 orlater
This is free software: you are free tochange and redistribute it.
There is NO WARRANTY, to the extentpermitted by law. Type "showcopying"
and "show warranty" fordetails.
This GDB was configured as "--host=i686-pc-linux-gnu--target=arm-none-linux-gnueabi".
For bug reporting instructions, pleasesee:
(gdb) target remote 192.168.16.40:2015
Remote debugging using192.168.16.40:2015
warning: Unable to find dynamic linkerbreakpoint function.
GDB will be unable to debug sharedlibrary initializers
and track explicitly loaded dynamiccode.
0x400cc8c0 in ?? ()
(gdb) l 1
1 #include
2
3 intmain(int argc, char *argv[])
4 {
5 for(inti=0; i<100; i++)
6 {
7 printf("hello,world!\n");
8 }
9
10 return0;
(gdb)
11 }
(gdb) b main
Breakpoint 1 at 0x8480: file hello.c,line 5.
(gdb) c
Continuing.
Error while mapping shared librarysections:
/lib/libc.so.0: No such file ordirectory.
Error while mapping shared librarysections:
/lib/ld-uClibc.so.0: No such file ordirectory.
Breakpoint 1, main (argc=1,argv=0xbe9bad74) at hello.c:5
5 for(inti=0; i<100; i++)
(gdb) n
7 printf("hello,world!\n");
(gdb) n
5 for(inti=0; i<100; i++)
(gdb)
【7 再看看目标机上的反应】
# gdbserver 192.168.16.200:2015 hello
Process hello created; pid = 27991
Listening on port 2015
Remote debugging from host 192.168.16.200
hello,world!