diff options
Diffstat (limited to 'sysdeps/i386/multiarch/memset_chk.c')
| -rw-r--r-- | sysdeps/i386/multiarch/memset_chk.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/sysdeps/i386/multiarch/memset_chk.c b/sysdeps/i386/multiarch/memset_chk.c new file mode 100644 index 0000000000..5e5c9b63e5 --- /dev/null +++ b/sysdeps/i386/multiarch/memset_chk.c @@ -0,0 +1,101 @@ +/* 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 |