https://sourceware.org/bugzilla/show_bug.cgi?id=12942
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a809b386e59dfcb3f4dedd8465975dabc55db5db
commit a809b386e59dfcb3f4dedd8465975dabc55db5db
Author: Alan Modra <amo...@gmail.com>
Date: Tue Oct 21 20:44:38 2014 +1030
Relax ppc64_elf_tls_optimize assertion
The code in ppc64_elf_tls_optimize looking at the .toc is only
interested in .toc entries that are addresses. .toc can contain more
than just an array of addresses, so if we have items that aren't
8-byte aligned, ignore them.
* elf64-ppc.c (ppc64_elf_tls_optimize): Ignore relocs against toc
entries that aren't a multiple of 8 rather than failing assertion.
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2609fe3d3f84ce62b373daa56ba615465c2d5293
commit 2609fe3d3f84ce62b373daa56ba615465c2d5293
Author: Jan Beulich <jbeul...@novell.com>
Date: Tue Oct 21 09:56:38 2014 +0200
ppc: enable msgclr and msgsnd on Power8
According to my reading of the spec it was an oversight for them to
not having got enabled when Power8 support got added.
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=334efb9a97018d8b2f508e5c22e5acb7b824cc76
commit 334efb9a97018d8b2f508e5c22e5acb7b824cc76
Author: Alan Modra <amo...@gmail.com>
Date: Tue Oct 21 17:06:01 2014 +1030
Add gcc-4.9 libgomp symbols requiring --plt-thread-safe for power7
powerpc64 ld builds plt call stubs with a read barrier to provide
thread safety on lazy plt updates, necessary on multi-threaded apps
with power7 or later weakly ordered memory. gcc-4.9 libgomp
introduced more functions that could call pthread_create, which means
we have more functions that if referenced in an executable should
cause a default of --plt-thread-safe.
bfd/
* elf64-ppc.c (ppc64_elf_size_stubs): Add gcc-4.9 libgomp functions
to thread_starter.
gold/
* powerpc.cc (do_relax): Add gcc-4.9 libgomp functions to
thread_starter.
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=35ac6b6a54f9be85dd9794fa6645fac3631e510b
commit 35ac6b6a54f9be85dd9794fa6645fac3631e510b
Author: Alan Modra <amo...@gmail.com>
Date: Sat Oct 18 21:46:48 2014 +1030
PowerPC64 ELFv1 function symbol definition vs LTO and discarded sections
When functions are emitted in comdat groups, global symbols defined in
duplicates of the group are treated as if they were undefined. That
prevents the symbols in the discarded sections from affecting the
linker's global symbol hash table or causing duplicate symbol errors.
Annoyingly, when gcc emits a function to a comdat group, it does not
put *all* of a function's code and data in the comdat group.
Typically, constant tables, exception handling info, and debug info
are emitted to normal sections outside of the group, which is a
perennial source of linker problems due to the special handling needed
to deal with the extra-group pieces that ought to be discarded. In
the case of powerpc64-gcc, the OPD entry for a function is not put in
the group. Since the function symbol is defined on the OPD entry this
means we need to handle symbols in .opd specially.
To see how this affects LTO in particular, consider the linker
testcase PR ld/12942 (1). This testcase links an LTO object file
pr12942a.o with a normal (non-LTO) object pr12942b.o. Both objects
contain a definition for _Z4testv in a comdat group. On loading
pr12942a.o, the linker sees a comdat group (actually linkonce section)
for _Z4testv and a weak _Z4testv defined in the IR. On loading
pr12942b.o, the linker sees the same comdat group, and thus discards
it. However, _Z4testv is a weak symbol defined in .opd, not part of
the group, so this weak symbol overrides the weak IR symbol. On
(re)loading the LTO version of pr12942a.o, the linker sees another
weak _Z4testv, but this one does not override the value we have from
pr12942b.o. The result is a linker complaint about "`_Z4testv'
... defined in discarded section `.group' of tmpdir/pr12942b.o".
* elf64-ppc.c (ppc64_elf_add_symbol_hook): If function code
section for function symbols defined in .opd is discarded, let
the symbol appear to be undefined.
(opd_entry_value): Ensure the result section is that for the
function code section in the same object as the OPD entry.
-----------------------------------------------------------------------
Summary of changes:
bfd/ChangeLog | 15 +++++
bfd/elf64-ppc.c | 116 +++++++++++++++++++++++++---------------
gas/testsuite/ChangeLog | 4 ++
gas/testsuite/gas/ppc/power8.d | 2 +
gas/testsuite/gas/ppc/power8.s | 2 +
gold/ChangeLog | 7 +++
gold/powerpc.cc | 6 ++
opcodes/ChangeLog | 6 ++
opcodes/ppc-opc.c | 4 +-
9 files changed, 116 insertions(+), 46 deletions(-)
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