glibc/sysdeps/x86_64/multiarch/memset_chk.c
H.J. Lu 93e46f8773 x86-64: Implement memset family IFUNC selectors in C
Implement memset 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 memset functions within libc.

2017-06-07  H.J. Lu  <hongjiu.lu@intel.com>
	    Erich Elsen  <eriche@google.com>

	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
	memset-sse2-unaligned-erms, and memset_chk-nonshared.
	* sysdeps/x86_64/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add test for __memset_chk_erms.
	Update comments.
	* sysdeps/x86_64/multiarch/ifunc-memset.h: New file.
	* sysdeps/x86_64/multiarch/memset-sse2-unaligned-erms.S: Likewise.
	* sysdeps/x86_64/multiarch/memset.c: Likewise.
	* sysdeps/x86_64/multiarch/memset_chk-nonshared.S: Likewise.
	* sysdeps/x86_64/multiarch/memset_chk.c: Likewise.
	* sysdeps/x86_64/multiarch/memset.S: Removed.
	* sysdeps/x86_64/multiarch/memset_chk.S: Likewise.
	* sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
	(__memset_chk_erms): New function.
2017-06-15 08:33:35 -07:00

32 lines
1.2 KiB
C

/* Multiple versions of __memset_chk
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2017 Free Software Foundation, Inc.
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/>. */
/* Define multiple versions only for the definition in libc.so. */
#if IS_IN (libc) && defined SHARED
# define __memset_chk __redirect_memset_chk
# include <string.h>
# undef __memset_chk
# define SYMBOL_NAME memset_chk
# include "ifunc-memset.h"
libc_ifunc_redirected (__redirect_memset_chk, __memset_chk,
IFUNC_SELECTOR ());
#endif