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[Gcl-devel] Re: relocation overflow
From: |
Geoff Keating |
Subject: |
[Gcl-devel] Re: relocation overflow |
Date: |
20 Nov 2002 13:01:14 -0800 |
User-agent: |
Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7 |
Daniel Jacobowitz <address@hidden> writes:
> On Wed, Nov 20, 2002 at 12:01:59PM -0500, Camm Maguire wrote:
> > Greetings, and thanks for your reply.
> >
> > The relocation type is R_PPC_REL24. I've got the failure up now in
> > gdb and can backtrace into the bfd library if this would help.
>
> Presumably it won't help - bear in mind, this is a _24-bit_ relocation.
> You have to load modules close enough that that suffices, or else you
> have to insert trampolines for longer jumps... through a GOT or
> whatever.
>
> PowerPC GCC doesn't seem to have a long-calls option, so you're just
> out of luck if you can't fit things in 16MB. Trampolines may be the
> way to go.
The way this is normally done, for programs that load arbitrary
modules, is that each module is a .so file, is built with -fpic, and
is loaded using the dlsym functions. Then the limit is 32Mb per
module, and you can have as many modules as your address space can
fit; cross-module calls happen through a PLT which can perform long
jumps.
I'm not sure how GCL works, but is it possible that you simply haven't
built the modules with -fpic?
--
- Geoffrey Keating <address@hidden>
- [Gcl-devel] relocation overflow, Camm Maguire, 2002/11/19
- Message not available
- [Gcl-devel] Re: relocation overflow, Camm Maguire, 2002/11/20
- [Gcl-devel] Re: relocation overflow, Daniel Jacobowitz, 2002/11/20
- [Gcl-devel] Re: relocation overflow,
Geoff Keating <=
- Re: [Gcl-devel] Re: relocation overflow, Camm Maguire, 2002/11/20
- Re: [Gcl-devel] Re: relocation overflow, Geoff Keating, 2002/11/21
- Re: [Gcl-devel] Re: relocation overflow, Camm Maguire, 2002/11/21
- Re: [Gcl-devel] Re: relocation overflow, Daniel Jacobowitz, 2002/11/21
- Re: [Gcl-devel] Re: relocation overflow, Camm Maguire, 2002/11/21
- Re: [Gcl-devel] Re: relocation overflow, Geoff Keating, 2002/11/21
- Re: [Gcl-devel] Re: relocation overflow, Camm Maguire, 2002/11/20
- Re: [Gcl-devel] Re: relocation overflow, Alan Modra, 2002/11/20
- [Gcl-devel] Re: relocation overflow, Camm Maguire, 2002/11/25