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| author | Alan Modra <amodra@gmail.com> | 2015-01-27 23:40:05 +1030 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2015-01-28 18:30:54 +1030 |
| commit | dbd1e97e32057af2841e5150daa2e2d4cb046a3b (patch) | |
| tree | ad21bab1f655d821724de5eab738bd4016aff80d /ld/emulparams | |
| parent | 3f8107ab38095bb3db840f9f14a0fd339f55e06e (diff) | |
| download | gdb-dbd1e97e32057af2841e5150daa2e2d4cb046a3b.zip gdb-dbd1e97e32057af2841e5150daa2e2d4cb046a3b.tar.gz gdb-dbd1e97e32057af2841e5150daa2e2d4cb046a3b.tar.bz2 | |
PowerPC64 changes for xlc
The changes to reorder sections for better relro protection on powerpc64,
3e2b0f31, 23283c1b, and 5ad18f16, run into a problem with xlc.
xlc -qdatalocal puts global variables into .toc, which means that .toc
must be writable. The simplest way to accomplish this is to edit the
linker script to remove .toc sections from .got on detecting xlc object
files.
bfd/
* elf64-ppc.h (struct ppc64_elf_params): Add "object_in_toc".
* elf64-ppc.c (ppc64_elf_add_symbol_hook): Assume that global symbols
in .toc indicate xlc compiled code that might require a rw .toc.
ld/
* emulparams/elf64ppc.sh (INITIAL_READWRITE_SECTIONS): Define.
* emultempl/ppc64elf.em (params): Init new field.
(ppc_after_open): New function.
(LDEMUL_AFTER_OPEN): Define.
* ldlang.c (lang_final): Whitespace fix.
ld/testsuite/
* ld-powerpc/tocvar.d, * ld-powerpc/tocvar.s: New test.
* ld-powerpc/tocnovar.d, * ld-powerpc/tocnovar.s: New test.
* ld-powerpc/powerpc.exp: Run tocvar and tocnovar.
Diffstat (limited to 'ld/emulparams')
| -rw-r--r-- | ld/emulparams/elf64ppc.sh | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/ld/emulparams/elf64ppc.sh b/ld/emulparams/elf64ppc.sh index b805dbe..d6b09bf 100644 --- a/ld/emulparams/elf64ppc.sh +++ b/ld/emulparams/elf64ppc.sh @@ -38,6 +38,8 @@ OTHER_RELRO_SECTIONS_2=" .opd ${RELOCATING-0} :${RELOCATING+ ALIGN(8)} { KEEP (*(.opd)) } .toc1 ${RELOCATING-0} :${RELOCATING+ ALIGN(8)} { *(.toc1) } .branch_lt ${RELOCATING-0} :${RELOCATING+ ALIGN(8)} { *(.branch_lt) }" +INITIAL_READWRITE_SECTIONS=" + .toc ${RELOCATING-0} :${RELOCATING+ ALIGN(8)} { *(.toc) }" # Put .got before .data DATA_GOT=" " # Always make .got read-only after relocation |