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/* Multiple versions of __memset_chk
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2015 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/>. */
/* Define multiple versions only for the definition in lib. */
#if IS_IN (libc)
# include <stddef.h>
extern void * __memset_chk (void *, int, size_t, size_t);
# ifdef SHARED
extern __typeof (__memset_chk) __memset_chk_i386 attribute_hidden;
extern __typeof (__memset_chk) __memset_chk_i586 attribute_hidden;
extern __typeof (__memset_chk) __memset_chk_i686 attribute_hidden;
extern __typeof (__memset_chk) __memset_chk_sse2 attribute_hidden;
extern __typeof (__memset_chk) __memset_chk_sse2_rep attribute_hidden;
# include <init-arch.h>
# else
/* Redefine memset so that the compiler won't complain about the type
mismatch with the IFUNC selector in strong_alias, below. */
# undef memset
# define memset __redirect_memset
# include <string.h>
# undef memset
extern __typeof (__redirect_memset) __memset_i386 attribute_hidden;
extern __typeof (__redirect_memset) __memset_i586 attribute_hidden;
extern __typeof (__redirect_memset) __memset_i686 attribute_hidden;
extern __typeof (__redirect_memset) __memset_sse2 attribute_hidden;
extern __typeof (__redirect_memset) __memset_sse2_rep attribute_hidden;
# include <init-arch.h>
/* Due to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10837
noreturn attribute disable tail call optimization. Removes noreturn
attribute to enable tail call optimization. */
extern void *chk_fail (void) __asm__ ("__chk_fail") attribute_hidden;
#define ifunc_chk(func, arch) \
static void * \
func##_chk_##arch (void *dstpp, int c, size_t len, \
size_t dstlen) \
{ \
if (__glibc_unlikely (dstlen < len)) \
return chk_fail (); \
return func##_##arch (dstpp, c, len); \
}
# if MINIMUM_ISA < 686
ifunc_chk (__memset, i386)
ifunc_chk (__memset, i586)
# else
extern __typeof (__redirect_memset) __memset_chk_i386 attribute_hidden;
extern __typeof (__redirect_memset) __memset_chk_i586 attribute_hidden;
# endif
ifunc_chk (__memset, i686)
ifunc_chk (__memset, sse2)
ifunc_chk (__memset, sse2_rep)
# endif
/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
ifunc symbol properly. */
extern void *memset_chk_ifunc (void) __asm__ ("__memset_chk");
void *
memset_chk_ifunc (void)
{
if (HAS_CPU_FEATURE (SSE2))
{
if (HAS_ARCH_FEATURE (Fast_Unaligned_Load))
return __memset_chk_sse2_rep;
else
return __memset_chk_sse2;
}
if (USE_I686)
return __memset_chk_i686;
else if (USE_I586)
return __memset_chk_i586;
else
return __memset_chk_i386;
}
__asm__ (".type __memset_chk, %gnu_indirect_function");
#endif
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