powerpc64: Use medium model toc accesses throughout

The PowerPC64 linker edits medium model toc-indirect code to toc-pointer
relative:
	addis r9,r2,tc_entry_for_var@toc@ha
	ld r9,tc_entry_for_var@toc@l(r9)
becomes
	addis r9,r2,(var-.TOC.)@ha
	addi r9,r9,(var-.TOC.)@l
when "var" is known to be local to the binary.  This isn't done for
small-model toc-indirect code, because "var" is almost guaranteed to
be too far away from .TOC. for a 16-bit signed offset.  And, because
the analysis of which .toc entry can be removed becomes much more
complicated in objects that mix code models, they aren't removed if
any small-model toc sequence appears in an object file.

Unfortunately, glibc's build of ld.so smashes the needed objects
together in a ld -r linking stage.  This means the GOT/TOC is left
with a whole lot of relative relocations which is untidy, but in
itself is not a serious problem.  However, static-pie on powerpc64
bombs due to a segfault caused by one of the small-model accesses
before _dl_relocate_static_pie.  (The very first one in rcrt1.o
passing start_addresses in r8 to __libc_start_main.)

So this patch makes all the toc/got accesses in assembly medium code
model, and a couple of functions hidden.  By itself this is not
enough to give us working static-pie, but it is useful in isolation to
enable better linker optimisation.

There's a serious problem in libgcc too.  libgcc ifuncs access the
AT_HWCAP words stored in the tcb with an offset from the thread
pointer (r13), but r13 isn't set at the time _dl_relocate_static_pie.
A followup patch will fix that.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/sysdeps/powerpc/powerpc64/sysdep.h b/sysdeps/powerpc/powerpc64/sysdep.h
index 3fec06e0df..011068b290 100644
--- a/sysdeps/powerpc/powerpc64/sysdep.h
+++ b/sysdeps/powerpc/powerpc64/sysdep.h
@@ -469,14 +469,16 @@ LT_LABELSUFFIX(name,_name_end): ; \
 	.tc _rtld_global_ro[TC],_rtld_global_ro
 # endif
 # define __GLRO(rOUT, var, offset)		\
-	ld	rOUT,.LC__ ## var@toc(r2);	\
+	addis	rOUT,r2,.LC__ ## var@toc@ha;	\
+	ld	rOUT,.LC__ ## var@toc@l(rOUT);	\
 	lwz	rOUT,offset(rOUT)
 #else
 # define __GLRO_DEF(var)			\
 .LC__ ## var:					\
 	.tc _ ## var[TC],_ ## var
 # define __GLRO(rOUT, var, offset)		\
-	ld	rOUT,.LC__ ## var@toc(r2);	\
+	addis	rOUT,r2,.LC__ ## var@toc@ha;	\
+	ld	rOUT,.LC__ ## var@toc@l(rOUT);	\
 	lwz	rOUT,0(rOUT)
 #endif