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Date: Tue, 20 Nov 2007 00:50:00 -0000
From: vb <vb@vsbe.com>
To: gdb@sourceware.org
Subject: add-symbol-file question
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Greetings,

I am trying to debug very early stages of bringing up a ppc82xx
kernel. (it's not relevant. but just in case: I'm using a bdi2000)

For some reason gdb fails to read the symbol table such that the text
segment is placed at 0:

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
(gdb) show version
GNU gdb 6.5
Copyright (C) 2006 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-8540-linux-gnu".
(gdb)  sym
Discard symbol table? (y or n) y
No symbol file now.
(gdb) add-symbol-file ../build/linux-2.6-lb4-powerpc/vmlinux  0x40000000
add symbol table from file "../build/linux-2.6-lb4-powerpc/vmlinux" at
        .text_addr = 0x40000000
(y or n) y
Reading symbols from
/local/vb/projects/vanilla-wt/build/linux-2.6-lb4-powerpc/vmlinux...done.
(gdb) p __start
$7 = {<text variable, no debug info>} 0x4000000c <__start>
(gdb) sym
Discard symbol table? (y or n) y
No symbol file now.
(gdb) add-symbol-file ../build/linux-2.6-lb4-powerpc/vmlinux  0x00000000
add symbol table from file "../build/linux-2.6-lb4-powerpc/vmlinux" at
        .text_addr = 0x0
(y or n) y
Reading symbols from
/local/vb/projects/vanilla-wt/build/linux-2.6-lb4-powerpc/vmlinux...done.
(gdb) p __start
$8 = {<text variable, no debug info>} 0x8000000c <__start>
(gdb)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


I tried loading it at different offsets, anything else but 0 works
just fine, anyone knows what's wrong?!

TIA,
/vb