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Re: fPIC and %ebx

From: Richard Henderson <rth at redhat dot com>
To: Joy Mukherjee <jmukherj at csgrad dot cs dot vt dot edu>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 15 Nov 2001 00:55:01 -0800
Subject: Re: fPIC and %ebx
References: <Pine.OSF.4.33.0111142246190.27294-100000@csgrad.cs.vt.edu>

On Wed, Nov 14, 2001 at 10:54:59PM -0500, Joy Mukherjee wrote:
> The problem is that whenever, I call
> a function, the value of %ebx is being reset to the original one at the
> beginning of the function.

This is how ELF PIC code is intended to work.  You want something
else entirely, and the compiler doesn't support that.

The closest equivalent that I can imagine is non-pic code with a
global hard register variable that points to your data structure.
See http://gcc.gnu.org/onlinedocs/gcc-3.0/gcc_5.html#SEC105.

r~

References:
- fPIC and %ebx
  - From: Joy Mukherjee

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