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From: Andreas Schwab <schwab@suse.de>
To: Paul Gilliam <gilliam@us.ibm.com>
Cc: gdb@sourceware.org
Subject: Re: /lib64/ld64.so.1 not being added to target sections list on ppc64
References: <OF2F87BDDD.E08F3E42-ON8825727A.00065CB6-8825727A.00088C21@us.ibm.com>
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Date: Tue, 06 Feb 2007 09:59:00 -0000
In-Reply-To: <OF2F87BDDD.E08F3E42-ON8825727A.00065CB6-8825727A.00088C21@us.ibm.com> 	(Paul Gilliam's message of "Mon, 5 Feb 2007 17:33:21 -0800")
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Paul Gilliam <gilliam@us.ibm.com> writes:

> There is another table of sections that is used when the gdb command 'info 
> symbol' is used.  If I go:
>   (gdb) p &malloc
>   (gdb) info symbol $1
>
> gdb responds 'malloc is in the .opd section'
>
> I don't understand:
>  1) why are there two section tables?
>  2) why aren't sections from /lib64/ld64.so.1 being loaded into the target 
> sections table?
>  3) why is the function pointer for 'malloc' pointing to a plt in the 
> /lib64/ld64.so object and not one in the main executable?

The problem is that there are two malloc implementation, the early one in
ld64.so and the real one in libc.so.  Unless you have debugging symbols
for libc.so the real one is never found.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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"And now for something completely different."