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Date: Mon, 08 Oct 2012 20:04:00 -0000
Message-ID: <CAMe9rOpU6+oRN=a5xxK4pZhnyET2v7mu0UzCXo=HrAdQnVqgig@mail.gmail.com>
Subject: Re: PING: PATCH: PR backtrace/14646: [x32] backtrace doesn't work
From: "H.J. Lu" <hjl.tools@gmail.com>
To: Mark Kettenis <mark.kettenis@xs4all.nl>
Cc: gdb-patches@sourceware.org
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On Mon, Oct 8, 2012 at 12:48 PM, Mark Kettenis <mark.kettenis@xs4all.nl> wrote:
>> Date: Thu, 4 Oct 2012 06:57:22 -0700
>> From: "H.J. Lu" <hjl.tools@gmail.com>
>>
>> On Wed, Oct 3, 2012 at 11:57 PM, Mark Kettenis <mark.kettenis@xs4all.nl> wrote:
>> >
>> > Perhaps the user-regs.c mechanism can be used to establish eip -> pc
>> > and esp -> sp mappings?
>>
>> It doesn't help as long as gdbarch_pc_regnum/gdbarch_sp_regnum
>> are used for both frame pc/sp value and unwind pc/sp value.  For x32,
>> we want eip/esp for frame pc/sp value and rip/rsp for unwind pc/sp
>> value.
>
> That probably means we need to set gdbarch_pc_regnum (and
> gdbarch_sp_regnum) to -1 for x32.

We can't set gdbarch_pc_regnum/gdbarch_sp_regnum to -1:


GNU gdb (GDB) 7.5.50.20121008-cvs
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from
/export/build/gnu/glibc-x32/build-x86_64-linux/elf/sln...done.
(gdb) b main
Breakpoint 1 at 0x400c20: file sln.c, line 50.
(gdb) r
Starting program: /export/build/gnu/glibc-x32/build-x86_64-linux/elf/sln
/export/gnu/import/git/gdb/gdb/regcache.c:1062: internal-error:
regcache_read_pc: Unable to find PC
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)


-- 
H.J.