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Re: new ppc32 GOT/PLT support
- From: Jakub Jelinek <jakub at redhat dot com>
- To: Alan Modra <amodra at bigpond dot net dot au>
- Cc: libc-alpha at sources dot redhat dot com
- Date: Tue, 7 Jun 2005 08:00:32 +0200
- Subject: Re: new ppc32 GOT/PLT support
- References: <20050517143353.GO27573@bubble.grove.modra.org> <20050525142810.GF11771@bubble.grove.modra.org>
- Reply-to: Jakub Jelinek <jakub at redhat dot com>
On Wed, May 25, 2005 at 11:58:10PM +0930, Alan Modra wrote:
> Revised ppc32 non-exec PLT/GOT support, which applies on top of
> http://sources.redhat.com/ml/libc-alpha/2005-05/msg00047.html, which
> hasn't yet been applied.
>
> Changes from the last patch: Removed PIC-ccflag fudge as -fPIC and
> -mdata-plt now work together. CGOTSETUP and CGOTRESTORE defines in
> sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h to handle
> init of r30 for plt calls to __librt_{en,dis}able_asynccancel.
>
> Tested with no "make check" regressions on nptl enabled powerpc-linux,
> both with new and old ABI compilers.
Seems to work for me.
I think we should mention the new relocs in <elf.h> though:
2005-06-07 Jakub Jelinek <jakub@redhat.com>
* elf/elf.h (R_PPC_REL16, R_PPC_REL16_LO, R_PPC_REL16_HI,
R_PPC_REL16_HA): Define.
--- libc/elf/elf.h.jj 2005-06-06 14:47:23.000000000 +0200
+++ libc/elf/elf.h 2005-06-06 18:57:37.000000000 +0200
@@ -1979,6 +1979,12 @@ typedef Elf32_Addr Elf32_Conflict;
#define R_PPC_DIAB_RELSDA_HI 184 /* like EMB_RELSDA, but high 16 bit */
#define R_PPC_DIAB_RELSDA_HA 185 /* like EMB_RELSDA, adjusted high 16 */
+/* GNU relocs used in PIC code sequences. */
+#define R_PPC_REL16 249 /* word32 (sym-.) */
+#define R_PPC_REL16_LO 250 /* half16 (sym-.)@l */
+#define R_PPC_REL16_HI 251 /* half16 (sym-.)@h */
+#define R_PPC_REL16_HA 252 /* half16 (sym-.)@ha */
+
/* This is a phony reloc to handle any old fashioned TOC16 references
that may still be in object files. */
#define R_PPC_TOC16 255
Jakub