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Re: gdb backtrace with core files

To: Brian Kuschak <bkuschak@yahoo.com>
Subject: Re: gdb backtrace with core files
From: Greg Weeks <greg.weeks@timesys.com>
Date: Thu, 07 Apr 2005 13:58:00 -0400
Cc: linux-mips@linux-mips.org
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Brian Kuschak wrote:

Is anyone succesfully using gdb for mipsel to debug
core dumps?  If so, can you share your secrets for
success?  I tried various recent versions (6.3,
6.1.1), but backtrace never works right, even though
the stack pointer appears to be valid.  gdb-5.3
partially works, but not completely.
Forcing gdb to use a specific stack pointer and PC
(frame <sp> <pc>) doesn't seem to help either.
Using linux 2.4.25 and gcc 3.3.3.

It appears to work for me. My gdb has a ton of patches from Amit Kale though. The kernel is the latest malta with a couple of patches that shouldn't affect gdb.

-bash-2.05b# gdb
GNU gdb TimeSys Linux (6.2.1-1rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "mipsel-linux".
(gdb) file gdb_core_tester
Reading symbols from /root/TestWare/TTS_2.4.2/command/gdb_man/gdb_core_tester...done.
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) core-file core.2045
Core was generated by `./gdb_core_tester'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libgcc_s.so.1...done.
Loaded symbols for /usr/lib/libgcc_s.so.1
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld.so.1...done.
Loaded symbols for /lib/ld.so.1
#0  0x00400f48 in add_node (rootptr=0x1000105c, nodeval=193)
   at create_core.c:75
75              if(node_ptr->value.value >= nodeval) {
(gdb) bt
#0  0x00400f48 in add_node (rootptr=0x1000105c, nodeval=193)
   at create_core.c:75
#1  0x00400fcc in add_node (rootptr=0x10001048, nodeval=193)
   at create_core.c:81
#2  0x00400f74 in add_node (rootptr=0x10000140, nodeval=193)
   at create_core.c:76
#3  0x00400df8 in create_tree (rootptr=0x10000140) at create_core.c:38
#4  0x00400b4c in main (argc=1, argv=0x7f931b44) at main.c:25

Greg Weeks

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