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| author | H.J. Lu <hjl.tools@gmail.com> | 2015-08-25 04:33:54 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-08-25 04:34:13 -0700 |
| commit | f3dcae82d54e5097e18e1d6ef4ff55c2ea4e621e (patch) | |
| tree | e43395ded84bf0aa25ecbe2d395082a182aae8b7 /sysdeps/x86_64/Makefile | |
| parent | 2d02fd07371bcd492c320cec649c6265787d794a (diff) | |
| download | glibc-f3dcae82d54e5097e18e1d6ef4ff55c2ea4e621e.tar.gz glibc-f3dcae82d54e5097e18e1d6ef4ff55c2ea4e621e.tar.xz glibc-f3dcae82d54e5097e18e1d6ef4ff55c2ea4e621e.zip | |
Save and restore vector registers in x86-64 ld.so
This patch adds SSE, AVX and AVX512 versions of _dl_runtime_resolve and _dl_runtime_profile, which save and restore the first 8 vector registers used for parameter passing. elf_machine_runtime_setup selects the proper _dl_runtime_resolve or _dl_runtime_profile based on _dl_x86_cpu_features. It avoids race condition caused by FOREIGN_CALL macros, which are only used for x86-64. Performance impact of saving and restoring 8 vector registers are negligible on Nehalem, Sandy Bridge, Ivy Bridge and Haswell when ld.so is optimized with SSE2. [BZ #15128] * sysdeps/x86_64/Makefile [$(subdir) == elf] (tests): Add ifuncmain8. (modules-names): Add ifuncmod8. ($(objpfx)ifuncmain8): New rule. * sysdeps/x86_64/dl-machine.h: Include <dl-procinfo.h> and <cpuid.h>. (elf_machine_runtime_setup): Use _dl_runtime_resolve_sse, _dl_runtime_resolve_avx, or _dl_runtime_resolve_avx512, _dl_runtime_profile_sse, _dl_runtime_profile_avx, or _dl_runtime_profile_avx512, based on HAS_ARCH_FEATURE. * sysdeps/x86_64/dl-trampoline.S: Rewrite. * sysdeps/x86_64/dl-trampoline.h: Likewise. * sysdeps/x86_64/ifuncmain8.c: New file. * sysdeps/x86_64/ifuncmod8.c: Likewise. * sysdeps/x86_64/nptl/tcb-offsets.sym (RTLD_SAVESPACE_SSE): Removed. * sysdeps/x86_64/nptl/tls.h (__128bits): Removed. (tcbhead_t): Change rtld_must_xmm_save to __glibc_unused1. Change rtld_savespace_sse to __glibc_unused2. (RTLD_CHECK_FOREIGN_CALL): Removed. (RTLD_ENABLE_FOREIGN_CALL): Likewise. (RTLD_PREPARE_FOREIGN_CALL): Likewise. (RTLD_FINALIZE_FOREIGN_CALL): Likewise.
Diffstat (limited to 'sysdeps/x86_64/Makefile')
| -rw-r--r-- | sysdeps/x86_64/Makefile | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile index 91875f0137..e50bcadf51 100644 --- a/sysdeps/x86_64/Makefile +++ b/sysdeps/x86_64/Makefile @@ -21,6 +21,11 @@ endif ifeq ($(subdir),elf) sysdep-dl-routines += tlsdesc dl-tlsdesc +tests += ifuncmain8 +modules-names += ifuncmod8 + +$(objpfx)ifuncmain8: $(objpfx)ifuncmod8.so + tests += tst-quad1 tst-quad2 modules-names += tst-quadmod1 tst-quadmod2 |