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 root@192.168.16.40 root@192.168.16.40's password: 123 #
【2 另启终端,编译elf可执行文件】 wuxian@ubuntu:~$ touch hello.c 1 #include<stdio.h> 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 root@192.168.16.40:/root root@192.168.16.40'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 <http:///licenses/gpl.html> 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: <https://support./GNUToolchain/>... (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<stdio.h> 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!
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