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[binutils-gdb] x86-64: Use PLT address for PC-relative reloc
- From: sergiodj+buildbot at sergiodj dot net
- To: gdb-testers at sourceware dot org
- Date: Wed, 14 Feb 2018 07:04:49 -0500
- Subject: [binutils-gdb] x86-64: Use PLT address for PC-relative reloc
- Authentication-results: sourceware.org; auth=none
*** TEST RESULTS FOR COMMIT 451875b4f976a527395e9303224c7881b65e12ed ***
Author: H.J. Lu <hjl.tools@gmail.com>
Branch: master
Commit: 451875b4f976a527395e9303224c7881b65e12ed
x86-64: Use PLT address for PC-relative reloc
Since PLT in PDE and PC-relative PLT in PIE can be used as function
address, there is no need for dynamic PC-relative relocation against
a dynamic function definition in PIE. Linker should resolve PC-relative
reference to its PLT address.
NB: i386 has non-PIC PLT and PIC PLT. Only non-PIC PLT in PDE can
be used as function address. PIC PLT in PIE can't be used as
function address.
bfd/
PR ld/22842
* elf32-i386.c (elf_i386_check_relocs): Pass FALSE for non
PC-relative PLT to NEED_DYNAMIC_RELOCATION_P.
* elf64-x86-64.c (elf_x86_64_check_relocs): Create PLT for
R_X86_64_PC32 reloc against dynamic function in data section.
Pass TRUE for PC-relative PLT to NEED_DYNAMIC_RELOCATION_P.
(elf_x86_64_relocate_section): Use PLT for R_X86_64_PC32 reloc
against dynamic function in data section.
* elfxx-x86.c (elf_x86_allocate_dynrelocs): Use PLT in PIE as
function address only if pcrel_plt is true.
(_bfd_x86_elf_link_hash_table_create): Set pcrel_plt.
* elfxx-x86.h (NEED_DYNAMIC_RELOCATION_P): Add PCREL_PLT for
PC-relative PLT. If PLT is PC-relative, don't generate dynamic
PC-relative relocation against a function definition in data
secton in PIE. Remove the obsolete comments.
(elf_x86_link_hash_table): Add pcrel_plt.
ld/
PR ld/22842
* testsuite/ld-i386/i386.exp: Run PR ld/22842 tests.
* testsuite/ld-x86-64/x86-64.exp: Likewise.
* testsuite/ld-i386/pr22842a.c: New file.
* testsuite/ld-i386/pr22842b.S: Likewise.
* testsuite/ld-x86-64/pr22842a.c: Likewise.
* testsuite/ld-x86-64/pr22842a.rd: Likewise.
* testsuite/ld-x86-64/pr22842b.S: Likewise.
* testsuite/ld-x86-64/pr22842b.rd: Likewise.
- Follow-Ups:
- Failures on RHEL-s390x-m64, branch master
- Failures on Fedora-x86_64-m64, branch master
- Failures on Fedora-x86_64-native-gdbserver-m32, branch master
- Failures on Fedora-x86_64-native-extended-gdbserver-m32, branch master
- Failures on Fedora-x86_64-native-extended-gdbserver-m64, branch master
- Failures on Fedora-i686, branch master
- Failures on Fedora-x86_64-m32, branch master
- Failures on Fedora-x86_64-cc-with-index, branch master
- Failures on Ubuntu-AArch32-native-extended-gdbserver-m32, branch master
- Failures on Ubuntu-AArch32-native-gdbserver-m32, branch master
- Failures on Debian-s390x-m64, branch master
- Failures on Debian-s390x-native-extended-gdbserver-m64, branch master
- Failures on Ubuntu-AArch64-m64, branch master