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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2021-01-22 16:57:32 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2021-01-25 16:15:54 +0000 |
| commit | 04c6a8073d1c9d73c4a88b536aeb803b12fbffdc (patch) | |
| tree | d6c6297e8d53931ddc878b3608f1e825e7232255 | |
| parent | ad47748992fadb6f1663f5a76eef3c24992a1815 (diff) | |
| download | glibc-04c6a8073d1c9d73c4a88b536aeb803b12fbffdc.tar glibc-04c6a8073d1c9d73c4a88b536aeb803b12fbffdc.tar.gz glibc-04c6a8073d1c9d73c4a88b536aeb803b12fbffdc.tar.bz2 glibc-04c6a8073d1c9d73c4a88b536aeb803b12fbffdc.zip | |
aarch64: Fix the list of tested IFUNC variants [BZ #26818]
Some IFUNC variants are not compatible with BTI and MTE so don't
set them as usable for testing and benchmarking on a BTI or MTE
enabled system.
As far as IFUNC selectors are concerned a system is BTI enabled if
the cpu supports it and glibc was built with BTI branch protection.
Most IFUNC variants are BTI compatible, but thunderx2 memcpy and
memmove use a jump table with indirect jump, without a BTI j.
Fixes bug 26818.
| -rw-r--r-- | sysdeps/aarch64/multiarch/ifunc-impl-list.c | 8 | ||||
| -rw-r--r-- | sysdeps/aarch64/multiarch/init-arch.h | 2 |
2 files changed, 6 insertions, 4 deletions
diff --git a/sysdeps/aarch64/multiarch/ifunc-impl-list.c b/sysdeps/aarch64/multiarch/ifunc-impl-list.c index a69eae65f0..99a8c68aac 100644 --- a/sysdeps/aarch64/multiarch/ifunc-impl-list.c +++ b/sysdeps/aarch64/multiarch/ifunc-impl-list.c @@ -40,13 +40,13 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/aarch64/multiarch/memcpy.c and memmove.c. */ IFUNC_IMPL (i, name, memcpy, IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_thunderx) - IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_thunderx2) + IFUNC_IMPL_ADD (array, i, memcpy, !bti, __memcpy_thunderx2) IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_falkor) IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_simd) IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_generic)) IFUNC_IMPL (i, name, memmove, IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_thunderx) - IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_thunderx2) + IFUNC_IMPL_ADD (array, i, memmove, !bti, __memmove_thunderx2) IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_falkor) IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_simd) IFUNC_IMPL_ADD (array, i, memmove, 1, __memmove_generic)) @@ -58,11 +58,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, IFUNC_IMPL_ADD (array, i, memset, 1, __memset_kunpeng) IFUNC_IMPL_ADD (array, i, memset, 1, __memset_generic)) IFUNC_IMPL (i, name, memchr, - IFUNC_IMPL_ADD (array, i, memchr, 1, __memchr_nosimd) + IFUNC_IMPL_ADD (array, i, memchr, !mte, __memchr_nosimd) IFUNC_IMPL_ADD (array, i, memchr, 1, __memchr_generic)) IFUNC_IMPL (i, name, strlen, - IFUNC_IMPL_ADD (array, i, strlen, 1, __strlen_asimd) + IFUNC_IMPL_ADD (array, i, strlen, !mte, __strlen_asimd) IFUNC_IMPL_ADD (array, i, strlen, 1, __strlen_mte)) return i; diff --git a/sysdeps/aarch64/multiarch/init-arch.h b/sysdeps/aarch64/multiarch/init-arch.h index fce260d168..a167699e74 100644 --- a/sysdeps/aarch64/multiarch/init-arch.h +++ b/sysdeps/aarch64/multiarch/init-arch.h @@ -30,5 +30,7 @@ GLRO(dl_aarch64_cpu_features).midr_el1; \ unsigned __attribute__((unused)) zva_size = \ GLRO(dl_aarch64_cpu_features).zva_size; \ + bool __attribute__((unused)) bti = \ + HAVE_AARCH64_BTI && GLRO(dl_aarch64_cpu_features).bti; \ bool __attribute__((unused)) mte = \ MTE_ENABLED (); |