qemu kgdb kdb

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http://www.kgdb.info/kgdb/use_kgdb/using_kgdb_base_qemu/

https://www.kernel.org/pub/linux/kernel/people/jwessel/kdb/usingKDB.html

http://blog.csdn.net/u013388374/article/details/23553031

http://www.linux-magazine.com/Online/Features/Qemu-and-the-Kernel

1. build kernel and rootfs according to http://www.kgdb.info/kgdb/use_kgdb/using_kgdb_base_qemu/

2. start qemu with 2 serial(-serial) and one gdb server (-s)

qemu -s -kernel /usr/src/work/bzImage.def -append "root=/dev/sd console=ttyS0,115200 kgdboc=ttyS1,115200 kgdbwait" -boot c -hda /usr/src/work/busybox.img -k en-us -serial tcp:127.0.0.1:4444,server -serial tcp:127.0.0.1:4445,server

3. start console and gdb console

telnet localhost 4444

gdb vmlinux

gdb> set remotebaud 115200

gdb> set debug remote 1

gdb> set target-async on

gdb> target remote :4445 或者直接用qemu提供的gdb server在 target remote :1234

4. 等待系统启动， gdb break in,

gdb> break sys_sync

gdb> c

5. 在系统里面通过sync让gdb break in, 也可以通过sysrq。

echo g >/proc/sysrq-trigger

minicom: ctrl a, f, g

telne supporting sending break: ctrl ], send break, press ENTER, g

6.Without gdb targeted, you get kdb on console

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