Debug uboot on QEMU ARM model with GDB

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本文介绍如何在QEMU ARM模型上运行U-Boot，并使用GDB进行远程调试。通过特定的命令行参数启动QEMU作为GDB服务器，然后在另一个终端中启动GDB客户端连接到该服务器进行调试。

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u-boot runs on QEMU ARM model , we can start GDB server on QEMU with command line parameters '-s -S' as following:

chunxie@chunxie-VirtualBox:~/uboot-mainline/u-boot$ qemu-system-arm -M vexpress-a9 -nographic -m 512 -kernel u-boot -s -S

Then in another terminal, we can start gdb to connect to GDB server(TCP port local:1234) as following:

chunxie@chunxie-VirtualBox:~/uboot-mainline/u-boot$ /opt/gcc-linaro-5.3-2016.02-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-gdb 
GNU gdb (Linaro GDB 2016.02) 7.10.1.20160210-cvs
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-unknown-linux-gnu --target=arm-linux-gnueabi".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://bugs.launchpad.net/gcc-linaro>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
(gdb) file u-boot
Reading symbols from u-boot...done.
(gdb) target remote:1234
Remote debugging using :1234
warning: remote target does not support file transfer, attempting to access files from local filesystem.
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
_start () at arch/arm/lib/vectors.S:54
54		b	reset
(gdb) l
49	
50	#ifdef CONFIG_SYS_DV_NOR_BOOT_CFG
51		.word	CONFIG_SYS_DV_NOR_BOOT_CFG
52	#endif
53	
54		b	reset
55		ldr	pc, _undefined_instruction
56		ldr	pc, _software_interrupt
57		ldr	pc, _prefetch_abort
58		ldr	pc, _data_abort
(gdb)

Here we can see gdb commands 'target' can connect to GDB server. Now we can do normal GDB debug.