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author | H.J. Lu <hjl.tools@gmail.com> | 2017-06-14 12:10:57 -0700 |
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committer | H.J. Lu <hjl.tools@gmail.com> | 2017-06-14 12:11:10 -0700 |
commit | 5c3e322d3be3803636e38bcaf083fb59b3a34f0c (patch) | |
tree | c28fc5c42069960659ebff1bffd1d0e71f4adcfd /sysdeps/x86_64/multiarch/mempcpy.S | |
parent | 69052a3a95da37169a08f9e59b2cc1808312753c (diff) | |
download | glibc-5c3e322d3be3803636e38bcaf083fb59b3a34f0c.tar.gz glibc-5c3e322d3be3803636e38bcaf083fb59b3a34f0c.tar.xz glibc-5c3e322d3be3803636e38bcaf083fb59b3a34f0c.zip |
x86-64: Implement memmove family IFUNC selectors in C
Implement memmove family IFUNC selectors in C. All internal calls within libc.so can use IFUNC on x86-64 since unlike x86, x86-64 supports PC-relative addressing to access the GOT entry so that it can call via PLT without using an extra register. For libc.a, we can't use IFUNC for functions which are called before IFUNC has been initialized. Use IFUNC internally reduces the icache footprint since libc.so and other codes in the process use the same implementations. This patch uses IFUNC for memmove family functions within libc. * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add memmove-sse2-unaligned-erms, memcpy_chk-nonshared, mempcpy_chk-nonshared and memmove_chk-nonshared. * sysdeps/x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add tests for __memmove_chk_erms, __memcpy_chk_erms and __mempcpy_chk_erms. Update comments. * sysdeps/x86_64/multiarch/ifunc-memmove.h: New file. * sysdeps/x86_64/multiarch/memcpy.c: Likewise. * sysdeps/x86_64/multiarch/memcpy_chk-nonshared.S: Likewise. * sysdeps/x86_64/multiarch/memcpy_chk.c: Likewise. * sysdeps/x86_64/multiarch/memmove-sse2-unaligned-erms.S: Likewise. * sysdeps/x86_64/multiarch/memmove.c: Likewise. * sysdeps/x86_64/multiarch/memmove_chk-nonshared.S: Likewise. * sysdeps/x86_64/multiarch/memmove_chk.c: Likewise. * sysdeps/x86_64/multiarch/mempcpy.c: Likewise. * sysdeps/x86_64/multiarch/mempcpy_chk-nonshared.S: Likewise. * sysdeps/x86_64/multiarch/mempcpy_chk.c: Likewise. * sysdeps/x86_64/multiarch/memcpy.S: Removed. * sysdeps/x86_64/multiarch/memcpy_chk.S: Likewise. * sysdeps/x86_64/multiarch/memmove.S: Likewise. * sysdeps/x86_64/multiarch/memmove_chk.S: Likewise. * sysdeps/x86_64/multiarch/mempcpy.S: Likewise. * sysdeps/x86_64/multiarch/mempcpy_chk.S: Likewise. * sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S (__mempcpy_chk_erms): New function. (__memmove_chk_erms): Likewise. (__memcpy_chk_erms): New alias.
Diffstat (limited to 'sysdeps/x86_64/multiarch/mempcpy.S')
-rw-r--r-- | sysdeps/x86_64/multiarch/mempcpy.S | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/sysdeps/x86_64/multiarch/mempcpy.S b/sysdeps/x86_64/multiarch/mempcpy.S deleted file mode 100644 index b8b2b28094..0000000000 --- a/sysdeps/x86_64/multiarch/mempcpy.S +++ /dev/null @@ -1,73 +0,0 @@ -/* Multiple versions of mempcpy - All versions must be listed in ifunc-impl-list.c. - Copyright (C) 2010-2017 Free Software Foundation, Inc. - Contributed by Intel Corporation. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <sysdep.h> -#include <init-arch.h> - -/* Define multiple versions only for the definition in lib and for - DSO. In static binaries we need mempcpy before the initialization - happened. */ -#if defined SHARED && IS_IN (libc) - .text -ENTRY(__mempcpy) - .type __mempcpy, @gnu_indirect_function - LOAD_RTLD_GLOBAL_RO_RDX - lea __mempcpy_erms(%rip), %RAX_LP - HAS_ARCH_FEATURE (Prefer_ERMS) - jnz 2f - HAS_ARCH_FEATURE (Prefer_No_AVX512) - jnz 1f - HAS_ARCH_FEATURE (AVX512F_Usable) - jz 1f - lea __mempcpy_avx512_no_vzeroupper(%rip), %RAX_LP - HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER) - jnz 2f - lea __mempcpy_avx512_unaligned_erms(%rip), %RAX_LP - HAS_CPU_FEATURE (ERMS) - jnz 2f - lea __mempcpy_avx512_unaligned(%rip), %RAX_LP - ret -1: lea __mempcpy_avx_unaligned(%rip), %RAX_LP - HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load) - jz L(Fast_Unaligned_Load) - HAS_CPU_FEATURE (ERMS) - jz 2f - lea __mempcpy_avx_unaligned_erms(%rip), %RAX_LP - ret -L(Fast_Unaligned_Load): - lea __mempcpy_sse2_unaligned(%rip), %RAX_LP - HAS_ARCH_FEATURE (Fast_Unaligned_Copy) - jz L(SSSE3) - HAS_CPU_FEATURE (ERMS) - jz 2f - lea __mempcpy_sse2_unaligned_erms(%rip), %RAX_LP - ret -L(SSSE3): - HAS_CPU_FEATURE (SSSE3) - jz 2f - lea __mempcpy_ssse3_back(%rip), %RAX_LP - HAS_ARCH_FEATURE (Fast_Copy_Backward) - jnz 2f - lea __mempcpy_ssse3(%rip), %RAX_LP -2: ret -END(__mempcpy) - -weak_alias (__mempcpy, mempcpy) -#endif |