On Monday 01 December 2014 03:26 PM, Freeman Zhang wrote:
Hi list,
I've been trying to setup a debug environment for linux
kernel(v3.4,Android,ARM) with kgdb. It worked fine untill I tried to use
it to debug a module. Under the instruction from LDD, I add module debug
info in gdb with command:
add-symbol-file test-module.ko address
LDD uses `cat /sys/module/test-module/sections/.text` to get the address
where the module has been loaded. However, I got:
0x00000000
Try reading the file as a root.
$ sudo cat /sys/module/test-module/sections/.text
When I use `lsmod`, I got:
test-module 15278 0 - Live 0x00000000 (O)
Why nothing but 0x00000000 ??
So I have to do some research in kernel/module.c, and find out that
struct module -> module_core = 0xbf000000. But when I try these in gdb:
add-symbol-file test-module.ko 0xbf000000
break one_of_my_function
I got:
Cannot access memory at address 0xbf002350
:(
Could somebody help?
All the best!
Freeman Zhang
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