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Re: gdb backtrace after SIGILL on Xscale (ARM)
- From: Harald Schiöberg <harald at net dot t-labs dot tu-berlin dot de>
- To: Shane Volpe <shanevolpe at gmail dot com>
- Cc: gdb at sourceware dot org
- Date: Fri, 26 Sep 2008 10:34:40 +0200
- Subject: Re: gdb backtrace after SIGILL on Xscale (ARM)
- References: <8c7950360809231027m64797d8dwfa60be3c164fd80c@mail.gmail.com>
This sounds like an EABI vs. OABI issue. see this thread:
http://sourceware.org/ml/gdb/2008-01/msg00032.html
harald
Shane Volpe wrote:
> I'm trying to perform a backtrace using gdb after a SIGILL event on an
> Xscale (ARM) target device. In order to simplify the issue I have
> wrote a small program (http://en.wikipedia.org/wiki/SIGILL) whose only
> purpose is to cause a SIGINT.
>
> The code is:
> int main()
> {
> unsigned char insn[4] = { 0xff, 0xff, 0xff, 0xff };
> void (*function)() = (void (*)()) insn;
> function();
> }
>
> I compiled it as follows:
> gcc -o sigill sigill.c
>
> I then run it on my host machine 'Linux, Arch: x86"
>
> gdb /home/sigill
> (gdb) run
> Starting program: /home/sigill
>
> Program received signal SIGILL, Illegal instruction.
> 0xbf81d400 in ?? ()
> (gdb) bt
> #0 0xbf81d400 in ?? ()
> #1 0x08048363 in main ()
>
>
> Every thing work as expected, I got a backtrace showing me the correct steps.
>
> I then compiled the program for my target system "Linux, Arch: Xscale (ARM)"
> I ran the app and got the following:
>
> /home/sigill
> BFD: /lib/.debug/ld-2.5.so: warning: sh_link not set for section `.ARM.exidx'
> BFD: /lib/.debug/libc-2.5.so: warning: sh_link not set for section `.ARM.exidx'
>
> Program received signal SIGILL, Illegal instruction.
> 0xbea7fc44 in ?? ()
> (gdb) bt
> #0 0xbea7fc44 in ?? ()
> (gdb)
>
> There is NO real information provided in the backtrace, why is this,
> what might I be doing wrong?
>
> Regards,
> Shane
--
Harald Schiöberg
Technische Universität Berlin | T-Laboratories | FG INET
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