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Re: Get backtrace at PLT and stepi into PLT
- From: Daniel Jacobowitz <drow at false dot org>
- To: Thinker Li <thinker at branda dot to>
- Cc: gdb-patches at sourceware dot org
- Date: Mon, 20 Jul 2009 08:07:22 -0400
- Subject: Re: Get backtrace at PLT and stepi into PLT
- References: <20090717142605.GA29594@caradoc.them.org> <19044.7794.607077.330791@bibi.branda.to>
On Mon, Jul 20, 2009 at 03:36:18PM +0800, Thinker Li wrote:
> And, as what you had said, there are a lot of ABI-defined mapping symbols
> ($a, $t) in symbol tables of shared objects. But, they are generated
> only for .text but .plt section. So, it got nothing to try to issue
> a backtrace command when the inferior is stopped at .plt section.
>
> Is GNU ld supposed to generate ABI-defined mapping symbols for
> .plt? Or, does GDB need to do more work on this issue?
Mapping symbols are used for other things, like setting breakpoints,
but not for backtrace. What's the actual problem with backtracing?
Current versions of GNU ld do generate correct mapping symbols for the
PLT. Some earlier versions didn't, though.
--
Daniel Jacobowitz
CodeSourcery