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From: Pedro Alves <pedro@codesourcery.com>
To: gdb-patches@sourceware.org
Subject: Re: [Doc]tracepoint: change *$esp@300 to *(unsigned char *)$esp@300
Date: Tue, 24 Aug 2010 18:37:00 -0000
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Cc: Michael Snyder <msnyder@vmware.com>, Eli Zaretskii <eliz@gnu.org>, "teawater@gmail.com" <teawater@gmail.com>
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On Tuesday 24 August 2010 19:07:17, Michael Snyder wrote:
> I think the reason it doesn't work now is that it's typed as a void pointer.
> 
> (gdb) pt $esp
> type = void *
> 
> Probably it used to be typed as a char * or something.

Dereferencing void* used to "work" in agent expressions,
but since it is forbidden in normal expressions, 

 (gdb) p *$sp
 Attempt to dereference a generic pointer.

the agent expression code was fixed to behave the same:

2010-02-11  Pedro Alves  <pedro@codesourcery.com>

        * ax-gdb.c (gen_deref): Don't allow dereferencing void pointers.

Let's just fix the docs.

-- 
Pedro Alves