3rd-party/linux-kernel-module-cheat
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kgdb: actually, module debug just works with automatic lx-symbols? What happened?

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Ciro Santilli 六四事件 法轮功
2018-11-02 22:00:06 +00:00
parent 63022702d6
commit b82bd50888
2 changed files with 5 additions and 18 deletions
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14
README.adoc
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@@ -1925,18 +1925,16 @@ Main more generic question: https://stackoverflow.com/questions/14155577/how-to-
=== KGDB kernel modules === KGDB kernel modules
In QEMU: Just works as you would expect:
.... ....
insmod /timer.ko insmod /timer.ko
/kgdb.sh
.... ....
Source: link:rootfs_overlay/kgdb-mod.sh[].
In GDB: In GDB:
.... ....
lx-symbols ../kernel_modules-1.0/
break lkmc_timer_callback break lkmc_timer_callback
continue continue
continue continue
@@ -1945,8 +1943,6 @@ continue
and you now control the count. and you now control the count.
TODO: if I `-ex lx-symbols` to the `gdb` command, just like done for QEMU `-gdb`, the kernel <<oops,oops>>. How to automate this step?
=== KDB === KDB
KDB is a way to use KDB directly in your main console, without GDB. KDB is a way to use KDB directly in your main console, without GDB.
@@ -1994,7 +1990,7 @@ You can get see further commands with:
[0]kdb> help [0]kdb> help
.... ....
The other KDB commands allow you to instruction steps, view memory, registers and some higher level kernel runtime data. The other KDB commands allow you to step instructions, view memory, registers and some higher level kernel runtime data similar to the superior GDB Python scripts.
==== KDB graphic ==== KDB graphic
@@ -2006,7 +2002,7 @@ You can also use KDB directly from the <<graphics,graphic>> window with:
This setup could be used to debug the kernel on machines without serial, such as modern desktops. This setup could be used to debug the kernel on machines without serial, such as modern desktops.
This works because `--graphics` This adds `kbd` (which stands for `KeyBoarD`!) to `kgdboc`. This works because `--graphics` adds `kbd` (which stands for `KeyBoarD`!) to `kgdboc`.
==== KDB ARM ==== KDB ARM
@@ -2038,7 +2034,7 @@ el0_svc_handler+0x74/0x90
el0_svc+0x8/0xc el0_svc+0x8/0xc
.... ....
My theory is that every serious ARM developer has either serial or JTAG, and no one ever tests this, and the kernel code is just broken. My theory is that every serious ARM developer has JTAG, and no one ever tests this, and the kernel code is just broken.
== gdbserver == gdbserver

9
rootfs_overlay/kgdb-mod.sh
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@@ -1,9 +0,0 @@
#!/bin/sh
insmod fops.ko
cd /sys/kernel/debug/lkmc_fops
i=0
while true; do
printf "$i" >f
i=$(($i+1))
done &
/kgdb.sh