sysdeps/s390/strcpy-z900.S

   1 /* strcpy - copy a string from source to destination.  64/31 bit S/390 version.
   2    Copyright (C) 2001-2020 Free Software Foundation, Inc.
   3    Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 /* INPUT PARAMETERS
  21      %r2 = address of destination
  22      %r3 = address of source.  */
  23
  24 #include <ifunc-strcpy.h>
  25 #include "sysdep.h"
  26 #include "asm-syntax.h"
  27
  28 #if HAVE_STRCPY_Z900_G5
  29 # if defined __s390x__
  30 #  define SLGR  slgr
  31 #  define LGR   lgr
  32 # else
  33 #  define SLGR  slr
  34 #  define LGR   lr
  35 # endif /* ! defined __s390x__  */
  36
  37         .text
  38 ENTRY(STRCPY_Z900_G5)
  39         SLGR  %r0,%r0
  40         LGR   %r1,%r2
  41 0:      mvst  %r1,%r3
  42         jo    0b
  43         br    %r14
  44 END(STRCPY_Z900_G5)
  45
  46 # undef SLGR
  47 # undef LGR
  48
  49 # if ! HAVE_STRCPY_IFUNC
  50 strong_alias (STRCPY_Z900_G5, strcpy)
  51 # endif
  52
  53 # if defined SHARED && IS_IN (libc)
  54 strong_alias (STRCPY_Z900_G5, __GI_strcpy)
  55 # endif
  56 #endif