sysdeps/x86_64/wcsnlen.S

   1 /* wcsnlen dispatch for RTLD and non-multiarch .c files
   2    Copyright (C) 2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* wcsnlen non-multiarch build is split into two files,
  20    wcsnlen-generic.c and wcsnlen.S. The wcsnlen.S build is for
  21    ISA level >= 2 uses the optimized assembly implementations in
  22    multiarch/wcsnlen*.S.  This must be split into two files because
  23    we cannot include C code from assembly or vice versa.  */
  24
  25 #include <isa-level.h>
  26
  27 #if MINIMUM_X86_ISA_LEVEL >= 2
  28
  29 # define WCSNLEN        __wcsnlen
  30 /* This symbol must stay linked to the name in wcslen.S.  */
  31 #if IS_IN (rtld)
  32 # define OVERFLOW_STRLEN        __wcslen
  33 #else
  34 # define OVERFLOW_STRLEN        HIDDEN_JUMPTARGET (__wcslen)
  35 #endif
  36
  37 # define DEFAULT_IMPL_V2        "multiarch/wcsnlen-sse4_1.S"
  38 # define DEFAULT_IMPL_V3        "multiarch/wcsnlen-avx2.S"
  39 # define DEFAULT_IMPL_V4        "multiarch/wcsnlen-evex.S"
  40
  41 /* isa-default-impl.h expects DEFAULT_IMPL_V1 to be defined but it
  42    should never be used from here.  */
  43 # define DEFAULT_IMPL_V1        "ERROR -- Invalid ISA IMPL"
  44
  45 # include "isa-default-impl.h"
  46
  47 weak_alias (__wcsnlen, wcsnlen)
  48 libc_hidden_def (__wcsnlen)
  49 #endif