Hi Raghavendra, Yes, you are right, 'sudo' isn't implemented in android. However, `su` enable me to read the .text as root. It's the same, 0x00000000. So I guess something else should be wrong. Thanks anyway! Freeman Zhang -------- Original Message -------- > Hi Zhang, > > On Monday 01 December 2014 04:32 PM, Freeman Zhang wrote: >> Hi Raghavendra, >> >> Thanks for your reply, but `sudo` doesn't solve the problem :( > Well then I guess 'sudo' isn't implemented in android. Any way, > ultimately you may wan't to login as root and then try reading the file > in order to get the address. > Regards, > Raghavendra >> >> All the best! >> >> Freeman Zhang >> >> -------- Original Message -------- >>> 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 >>>> >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> Kernelnewbies mailing list >>>> Kernelnewbies@xxxxxxxxxxxxxxxxx >>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >>> >>> ------------------------------------------------------------------------------------------------------------------------------- >>> >>> >>> [ C-DAC is on Social-Media too. Kindly follow us at: >>> Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] >>> >>> This e-mail is for the sole use of the intended recipient(s) and may >>> contain confidential and privileged information. If you are not the >>> intended recipient, please contact the sender by reply e-mail and >>> destroy >>> all copies and the original message. Any unauthorized review, use, >>> disclosure, dissemination, forwarding, printing or copying of this email >>> is strictly prohibited and appropriate legal action will be taken. >>> ------------------------------------------------------------------------------------------------------------------------------- >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> Kernelnewbies mailing list >>> Kernelnewbies@xxxxxxxxxxxxxxxxx >>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >>> > > > ------------------------------------------------------------------------------------------------------------------------------- > > [ C-DAC is on Social-Media too. Kindly follow us at: > Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] > > This e-mail is for the sole use of the intended recipient(s) and may > contain confidential and privileged information. If you are not the > intended recipient, please contact the sender by reply e-mail and destroy > all copies and the original message. Any unauthorized review, use, > disclosure, dissemination, forwarding, printing or copying of this email > is strictly prohibited and appropriate legal action will be taken. > ------------------------------------------------------------------------------------------------------------------------------- > >
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