glibc/sysdeps/x86_64/multiarch/mempcpy.c

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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.
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/* Multiple versions of mempcpy.
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2017-2023 Free Software Foundation, Inc.
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.
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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
Prefer https to http for gnu.org and fsf.org URLs Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
<https://www.gnu.org/licenses/>. */
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.
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/* Define multiple versions only for the definition in libc. */
#if IS_IN (libc)
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.
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# define mempcpy __redirect_mempcpy
# define __mempcpy __redirect___mempcpy
# define NO_MEMPCPY_STPCPY_REDIRECT
# define __NO_STRING_INLINES
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.
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# include <string.h>
# undef mempcpy
# undef __mempcpy
# define SYMBOL_NAME mempcpy
# include "ifunc-memmove.h"
libc_ifunc_redirected (__redirect_mempcpy, __mempcpy, IFUNC_SELECTOR ());
weak_alias (__mempcpy, mempcpy)
# ifdef SHARED
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.
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__hidden_ver1 (__mempcpy, __GI___mempcpy, __redirect___mempcpy)
Add support for GCC 9 attribute copy. GCC 9 has gained an enhancement to help detect attribute mismatches between alias declarations and their targets. It consists of a new warning, -Wattribute-alias, an enhancement to an existing warning, -Wmissing-attributes, and a new attribute called copy. The purpose of the warnings is to help identify either possible bugs (an alias declared with more restrictive attributes than its target promises) or optimization or diagnostic opportunities (an alias target missing some attributes that it could be declared with that might benefit analysis and code generation). The purpose of the new attribute is to easily apply (almost) the same set of attributes to one declaration as those already present on another. As expected (and intended) the enhancement triggers warnings for many alias declarations in Glibc code. This change, tested on x86_64-linux, avoids all instances of the new warnings by making use of the attribute where appropriate. To fully benefit from the enhancement Glibc will need to be compiled with -Wattribute-alias=2 and remaining warnings reviewed and dealt with (there are a couple of thousand but most should be straightforward to deal with). ChangeLog: * include/libc-symbols.h (__attribute_copy__): Define macro unless it's already defined. (_strong_alias): Use __attribute_copy__. (_weak_alias, __hidden_ver1, __hidden_nolink2): Same. * misc/sys/cdefs.h (__attribute_copy__): New macro. * sysdeps/x86_64/multiarch/memchr.c (memchr): Use __attribute_copy__. * sysdeps/x86_64/multiarch/memcmp.c (memcmp): Same. * sysdeps/x86_64/multiarch/mempcpy.c (mempcpy): Same. * sysdeps/x86_64/multiarch/memset.c (memset): Same. * sysdeps/x86_64/multiarch/stpcpy.c (stpcpy): Same. * sysdeps/x86_64/multiarch/strcat.c (strcat): Same. * sysdeps/x86_64/multiarch/strchr.c (strchr): Same. * sysdeps/x86_64/multiarch/strcmp.c (strcmp): Same. * sysdeps/x86_64/multiarch/strcpy.c (strcpy): Same. * sysdeps/x86_64/multiarch/strcspn.c (strcspn): Same. * sysdeps/x86_64/multiarch/strlen.c (strlen): Same. * sysdeps/x86_64/multiarch/strncmp.c (strncmp): Same. * sysdeps/x86_64/multiarch/strncpy.c (strncpy): Same. * sysdeps/x86_64/multiarch/strnlen.c (strnlen): Same. * sysdeps/x86_64/multiarch/strpbrk.c (strpbrk): Same. * sysdeps/x86_64/multiarch/strrchr.c (strrchr): Same. * sysdeps/x86_64/multiarch/strspn.c (strspn): Same.
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__attribute__ ((visibility ("hidden"))) __attribute_copy__ (mempcpy);
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.
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__hidden_ver1 (mempcpy, __GI_mempcpy, __redirect_mempcpy)
Add support for GCC 9 attribute copy. GCC 9 has gained an enhancement to help detect attribute mismatches between alias declarations and their targets. It consists of a new warning, -Wattribute-alias, an enhancement to an existing warning, -Wmissing-attributes, and a new attribute called copy. The purpose of the warnings is to help identify either possible bugs (an alias declared with more restrictive attributes than its target promises) or optimization or diagnostic opportunities (an alias target missing some attributes that it could be declared with that might benefit analysis and code generation). The purpose of the new attribute is to easily apply (almost) the same set of attributes to one declaration as those already present on another. As expected (and intended) the enhancement triggers warnings for many alias declarations in Glibc code. This change, tested on x86_64-linux, avoids all instances of the new warnings by making use of the attribute where appropriate. To fully benefit from the enhancement Glibc will need to be compiled with -Wattribute-alias=2 and remaining warnings reviewed and dealt with (there are a couple of thousand but most should be straightforward to deal with). ChangeLog: * include/libc-symbols.h (__attribute_copy__): Define macro unless it's already defined. (_strong_alias): Use __attribute_copy__. (_weak_alias, __hidden_ver1, __hidden_nolink2): Same. * misc/sys/cdefs.h (__attribute_copy__): New macro. * sysdeps/x86_64/multiarch/memchr.c (memchr): Use __attribute_copy__. * sysdeps/x86_64/multiarch/memcmp.c (memcmp): Same. * sysdeps/x86_64/multiarch/mempcpy.c (mempcpy): Same. * sysdeps/x86_64/multiarch/memset.c (memset): Same. * sysdeps/x86_64/multiarch/stpcpy.c (stpcpy): Same. * sysdeps/x86_64/multiarch/strcat.c (strcat): Same. * sysdeps/x86_64/multiarch/strchr.c (strchr): Same. * sysdeps/x86_64/multiarch/strcmp.c (strcmp): Same. * sysdeps/x86_64/multiarch/strcpy.c (strcpy): Same. * sysdeps/x86_64/multiarch/strcspn.c (strcspn): Same. * sysdeps/x86_64/multiarch/strlen.c (strlen): Same. * sysdeps/x86_64/multiarch/strncmp.c (strncmp): Same. * sysdeps/x86_64/multiarch/strncpy.c (strncpy): Same. * sysdeps/x86_64/multiarch/strnlen.c (strnlen): Same. * sysdeps/x86_64/multiarch/strpbrk.c (strpbrk): Same. * sysdeps/x86_64/multiarch/strrchr.c (strrchr): Same. * sysdeps/x86_64/multiarch/strspn.c (strspn): Same.
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__attribute__ ((visibility ("hidden"))) __attribute_copy__ (mempcpy);
# endif
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.
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#endif