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Re: [RFC] Enhance backtrace for microsoft system DLL calls

From: Daniel Jacobowitz <drow at false dot org>
To: Pedro Alves <pedro_alves at portugalmail dot pt>
Cc: Pierre Muller <muller at ics dot u-strasbg dot fr>, gdb-patches at sourceware dot org
Date: Mon, 10 Dec 2007 12:37:49 -0500
Subject: Re: [RFC] Enhance backtrace for microsoft system DLL calls
References: <000001c83b4a$573b4560$05b1d020$@u-strasbg.fr> <4053daab0712100931yb44d6e4m51ab3072f1406187@mail.gmail.com>

On Mon, Dec 10, 2007 at 05:31:35PM +0000, Pedro Alves wrote:
> That's placed there for hot patching, together with 5 bytes of slack before the
> function (the idea is to be able to replace that 2 byte op with a jump to
> 5 bytes back, and patch the 5 bytes with a jump into anywhere in the
> 32-bit address space.)

Interesting.

> You can put a flag in i386's gdbarch_tdep (look in
> i386-tdep.h, and i386-cygwin-tdep.c).

I don't think we need to.  Hot patching this way may be MS-specific,
but a two byte NOP is a two byte NOP no matter where you find it.

-- 
Daniel Jacobowitz
CodeSourcery

References:
- [RFC] Enhance backtrace for microsoft system DLL calls
  - From: Pierre Muller
- Re: [RFC] Enhance backtrace for microsoft system DLL calls
  - From: Pedro Alves

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