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Re: PATCH: Allow a global symbol set to common/undefined symbol
- From: Etienne Lorrain <etienne_lorrain at yahoo dot fr>
- To: Daniel Jacobowitz <drow at false dot org>
- Cc: Nick Clifton <nickc at redhat dot com>, "H. J. Lu" <hjl at lucon dot org>, Dave Korn <dave dot korn at artimi dot com>, binutils at sources dot redhat dot com
- Date: Thu, 28 Apr 2005 16:13:48 +0200 (CEST)
- Subject: Re: PATCH: Allow a global symbol set to common/undefined symbol
Sometimes I feel bad.
Thanks.
--- Daniel Jacobowitz <drow@false.org> wrote:
> On Thu, Apr 28, 2005 at 04:02:08PM +0200, Etienne Lorrain wrote:
> > Sorry to bother again...
> >
> > With this patch and the source I am using, I have a problem elsewhere.
> > It is initially due to GCC doing hidden real call to memcpy and
> > memset when optimising for size (they consider calling those
> > functions save space...)
> >
> > Basically because I am using two code segments (%cs can have two values
> > to have twice 64 Kbytes accessible) I need two memcpy/memset, one in
> each
> > segment. Because GCC insert real "call memset" I need to change the
> > name of the function called in the assembler file - I am doing:
> > asm ("memcpy = xcodeseg_memcpy \n");
> > asm ("memset = xcodeseg_memset \n");
> > So that "call memcpy" is replaced by "call xcodeseg_memcpy".
> >
> > With the H.J. patch in the assembler, I get messages:
> > disk.s:7307: Error: Local symbol `memcpy' can't be equated to undefined
> > symbol `xcodeseg_memcpy'
> >
> > I tried to define xcodeseg_memcpy as ".extern" of ".global" without
> > success - even if they really are defined elsewhere.
> >
> > Is there a simple solution for my problem?
>
> You need to mark memcpy as .globl, not xcodeseg_memcpy.
>
>
> --
> Daniel Jacobowitz
> CodeSourcery, LLC
>
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