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| author | Igor Zamyatin <igor.zamyatin@intel.com> | 2014-04-01 10:16:04 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2014-04-09 15:38:09 -0700 |
| commit | a4c75cfd56e536c2b18556e8a482d88dffa0fffc (patch) | |
| tree | 209bb53676f4cee8fde2a1f9d038829dd78fe28c /config.h.in | |
| parent | 27822ce67fbf7f2b204992a410e7da2e8c1e2607 (diff) | |
| download | glibc-a4c75cfd56e536c2b18556e8a482d88dffa0fffc.zip glibc-a4c75cfd56e536c2b18556e8a482d88dffa0fffc.tar.gz glibc-a4c75cfd56e536c2b18556e8a482d88dffa0fffc.tar.bz2 | |
Save/restore bound registers in _dl_runtime_resolve
This patch saves and restores bound registers in symbol lookup for x86-64:
1. Branches without BND prefix clear bound registers.
2. x86-64 pass bounds in bound registers as specified in MPX psABI
extension on hjl/mpx/master branch at
https://github.com/hjl-tools/x86-64-psABI
https://groups.google.com/forum/#!topic/x86-64-abi/KFsB0XTgWYc
Binutils has been updated to create an alternate PLT to add BND prefix
when branching to ld.so.
* config.h.in (HAVE_MPX_SUPPORT): New #undef.
* sysdeps/x86_64/configure.ac: Set HAVE_MPX_SUPPORT.
* sysdeps/x86_64/configure: Regenerated.
* sysdeps/x86_64/dl-trampoline.S (REGISTER_SAVE_AREA): New
macro.
(REGISTER_SAVE_RAX): Likewise.
(REGISTER_SAVE_RCX): Likewise.
(REGISTER_SAVE_RDX): Likewise.
(REGISTER_SAVE_RSI): Likewise.
(REGISTER_SAVE_RDI): Likewise.
(REGISTER_SAVE_R8): Likewise.
(REGISTER_SAVE_R9): Likewise.
(REGISTER_SAVE_BND0): Likewise.
(REGISTER_SAVE_BND1): Likewise.
(REGISTER_SAVE_BND2): Likewise.
(_dl_runtime_resolve): Use them. Save and restore Intel MPX
bound registers when calling _dl_fixup.
Diffstat (limited to 'config.h.in')
| -rw-r--r-- | config.h.in | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/config.h.in b/config.h.in index 3fc34bd..b6e3623 100644 --- a/config.h.in +++ b/config.h.in @@ -104,6 +104,9 @@ /* Define if assembler supports AVX512. */ #undef HAVE_AVX512_ASM_SUPPORT +/* Define if assembler supports Intel MPX. */ +#undef HAVE_MPX_SUPPORT + /* Define if gcc supports FMA4. */ #undef HAVE_FMA4_SUPPORT |