From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3BE05989.2DD8C8EC@midrivers.com> Date: Wed, 31 Oct 2001 13:05:29 -0700 From: Mark Pilon MIME-Version: 1.0 To: "Wright, David" , linuxppc-embedded@lists.linuxppc.org Subject: Re: mvista gdb 5.0 core dumping References: Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: "Wright, David" wrote: > > What a timely question -- I just debugged this one last night. > This is a bug in the code in the partial-stab.h file. Here's the > diff output of what I change in it to make this abort stop > happening: ... timely is right -- any idea how I was able to debug earlier kernels ? I appreciate your perspective of doing this blind -- any idea what I'm doing to _cause_ this? I'd rather not rebuild gdb ... Mark > > 602c602 > < if (textlow_not_set > --- > > if (pst && (textlow_not_set > 605c605 > < != ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT))) > --- > > != ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT)))) > 649c649 > < if (textlow_not_set > --- > > if (pst && (textlow_not_set > 652c652 > < != ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT))) > --- > > != ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT)))) > > I don't claim that this is a great solution, in that I have no > real sense of what the code is doing, but this change does get > rid of the null pointer dereference that's blowing you up. > > -- David Wright, Consulting Engineer > InfiniSwitch Corp., Westborough, MA > > > -----Original Message----- > > From: Mark Pilon [mailto:mpilon@midrivers.com] > > Sent: Wednesday, October 31, 2001 2:44 PM > > To: linuxppc-embedded@lists.linuxppc.org > > Subject: mvista gdb 5.0 core dumping > > > > > > > > I'm trying to debug the a kernel build from the 2_4_devel tree, > > built w/ a toolset I built, debugging w/ mvista's 5.0 gdb: > > > > ppc_405-gdb vmlinux > > GNU gdb 5.0 > > Copyright 2000 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 "--host=i686-pc-linux-gnu > > --target=powerpc-hardhat-linux"...Segmentation fault (core dumped) > > > > attempting to debug gdb: > > > > [mpilon@wolf linuxppc_2_4_devel]$ gdb `which ppc_405-gdb` core > > GNU gdb 19991004 > > Copyright 1998 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 "i386-redhat-linux"... > > Core was generated by `ppc_405-gdb vmlinux'. > > Program terminated with signal 11, Segmentation fault. > > Reading symbols from /usr/lib/libncurses.so.4...done. > > Reading symbols from /lib/libm.so.6...done. > > Reading symbols from /lib/libdl.so.2...done. > > Reading symbols from /lib/libc.so.6...done. > > Reading symbols from /lib/ld-linux.so.2...done. > > #0 0x80d9efe in read_dbx_symtab (objfile=0x81dec00) > > at ../../gdb/partial-stab.h:654 > > 654 ../../gdb/partial-stab.h: No such file or directory. > > (gdb) where > > #0 0x80d9efe in read_dbx_symtab (objfile=0x81dec00) > > at ../../gdb/partial-stab.h:654 > > #1 0x80d8a41 in dbx_symfile_read (objfile=0x81dec00, mainline=0) > > at ../../gdb/dbxread.c:631 > > #2 0x80db4c9 in elfstab_build_psymtabs (objfile=0x81dec00, > > mainline=0, > > staboffset=1527808, stabsize=1260, stabstroffset=1529068, > > stabstrsize=1597) > > at ../../gdb/dbxread.c:2652 > > #3 0x80de1f4 in elf_symfile_read (objfile=0x81dec00, mainline=0) > > at ../../gdb/elfread.c:663 > > #4 0x8084d3e in syms_from_objfile (objfile=0x81dec00, > > addrs=0xbffff280, > > mainline=1, verbo=0) at ../../gdb/symfile.c:807 > > #5 0x8084ee2 in symbol_file_add (name=0x81d3718 "vmlinux", > > from_tty=0, > > addrs=0x0, mainline=1, flags=32) at ../../gdb/symfile.c:943 > > #6 0x8085157 in symbol_file_command (args=0xbffffb40 > > "vmlinux", from_tty=0) > > at ../../gdb/symfile.c:1087 > > #7 0x80b377c in do_captured_command (data=0xbffff7a4) at > > ../../gdb/top.c:679 > > #8 0x80b36f3 in catch_errors (func=0x80b376c , > > args=0xbffff7a4, errstring=0x8169840 "", mask=6) at > > ../../gdb/top.c:615 > > #9 0x80b37ba in catch_command_errors ( > > command=0x8084f9c , arg=0xbffffb40 "vmlinux", > > from_tty=0, mask=6) at ../../gdb/top.c:699 > > #10 0x806b2ab in captured_main (data=0xbffff9d0) at > > ../../gdb/main.c:603 > > #11 0x80b36f3 in catch_errors (func=0x806ab24 , > > args=0xbffff9d0, errstring=0x8149451 "", mask=6) at > > ../../gdb/top.c:615 > > #12 0x806b4ff in main (argc=2, argv=0xbffffa24) at > > ../../gdb/main.c:761 > > (gdb) > > > > any ideas what could be causing this? I've debugged kernels before > > w/ toolsets I've built. > > > > thanks, > > > > Mark > > > > -- > > Mark Pilon > > > > Minolta-QMS > > P.O. Box 37 > > Fallon, MT. 59326-0037 > > > > 1-406-853-0433 > > > > > > -- Mark Pilon Minolta-QMS P.O. Box 37 Fallon, MT. 59326-0037 1-406-853-0433 ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/