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Date: Tue, 9 Sep 2014 09:53:05 +0200
From: Andreas Krebbel <krebbel at linux dot vnet dot ibm dot com>
To: binutils at sourceware dot org
Subject: [PATCH] S/390: Avoid TLS_LE* -> TLS_TPOFF translation for PIE
Message-ID: <20140909075305.GA8292@maggie>
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Hi,
for S/390 there is code which is supposed to handle non-pic objects
being linked to a shared lib. For TLS this code replaces the TLS_LE*
relocs with a runtime reloc. The code is triggered by the `shared`
flag and therefore also for PIE. But for PIE no runtime reloc is
needed since the TLS offsets are always link-time computable.
(Btw. for s390x that special handling is anyway rather questionable
since non-pic code will not work in a shared lib for various other
reasons.)
Fixed with the attached patch.
No regressions on s390 and s390x.
bfd/
2014-09-09 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* elf32-s390.c: Don't replace R_390_TLS_LE32 with R_390_TLS_TPOFF
for PIE.
* elf64-s390.c: Don't replace R_390_TLS_LE64 with R_390_TLS_TPOFF
for PIE.
diff --git a/bfd/elf32-s390.c b/bfd/elf32-s390.c
index 11c726f..ebcb028 100644
--- a/bfd/elf32-s390.c
+++ b/bfd/elf32-s390.c
@@ -1250,6 +1250,12 @@ elf_s390_check_relocs (bfd *abfd,
/* Fall through. */
case R_390_TLS_LE32:
+ /* For static linking and executables this reloc will be
+ calculated at linktime otherwise a TLS_TPOFF runtime
+ reloc will be generated. */
+ if (r_type == R_390_TLS_LE32 && info->pie)
+ break;
+
if (!info->shared)
break;
info->flags |= DF_STATIC_TLS;
@@ -3104,7 +3110,7 @@ elf_s390_relocate_section (bfd *output_bfd,
break;
case R_390_TLS_LE32:
- if (info->shared)
+ if (info->shared && !info->pie)
{
/* Linking a shared library with non-fpic code requires
a R_390_TLS_TPOFF relocation. */
diff --git a/bfd/elf64-s390.c b/bfd/elf64-s390.c
index d7b2f08..b2f1aa5 100644
--- a/bfd/elf64-s390.c
+++ b/bfd/elf64-s390.c
@@ -1183,6 +1183,12 @@ elf_s390_check_relocs (bfd *abfd,
/* Fall through */
case R_390_TLS_LE64:
+ /* For static linking and executables this reloc will be
+ calculated at linktime otherwise a TLS_TPOFF runtime
+ reloc will be generated. */
+ if (r_type == R_390_TLS_LE64 && info->pie)
+ break;
+
if (!info->shared)
break;
info->flags |= DF_STATIC_TLS;
@@ -3074,7 +3080,7 @@ elf_s390_relocate_section (bfd *output_bfd,
break;
case R_390_TLS_LE64:
- if (info->shared)
+ if (info->shared && !info->pie)
{
/* Linking a shared library with non-fpic code requires
a R_390_TLS_TPOFF relocation. */