arch/arm64/lib/memcpy.S

   1 /*
   2  * Copyright (C) 2013 ARM Ltd.
   3  * Copyright (C) 2013 Linaro.
   4  *
   5  * This code is based on glibc cortex strings work originally authored by Linaro
   6  * and re-licensed under GPLv2 for the Linux kernel. The original code can
   7  * be found @
   8  *
   9  * http://bazaar.launchpad.net/~linaro-toolchain-dev/cortex-strings/trunk/
  10  * files/head:/src/aarch64/
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25 #include <linux/linkage.h>
  26 #include <asm/assembler.h>
  27 #include <asm/cache.h>
  28
  29 /*
  30  * Copy a buffer from src to dest (alignment handled by the hardware)
  31  *
  32  * Parameters:
  33  *      x0 - dest
  34  *      x1 - src
  35  *      x2 - n
  36  * Returns:
  37  *      x0 - dest
  38  */
  39         .macro ldrb1 ptr, regB, val
  40         ldrb  \ptr, [\regB], \val
  41         .endm
  42
  43         .macro strb1 ptr, regB, val
  44         strb \ptr, [\regB], \val
  45         .endm
  46
  47         .macro ldrh1 ptr, regB, val
  48         ldrh  \ptr, [\regB], \val
  49         .endm
  50
  51         .macro strh1 ptr, regB, val
  52         strh \ptr, [\regB], \val
  53         .endm
  54
  55         .macro ldr1 ptr, regB, val
  56         ldr \ptr, [\regB], \val
  57         .endm
  58
  59         .macro str1 ptr, regB, val
  60         str \ptr, [\regB], \val
  61         .endm
  62
  63         .macro ldp1 ptr, regB, regC, val
  64         ldp \ptr, \regB, [\regC], \val
  65         .endm
  66
  67         .macro stp1 ptr, regB, regC, val
  68         stp \ptr, \regB, [\regC], \val
  69         .endm
  70
  71         .weak memcpy
  72 ENTRY(__memcpy)
  73 ENTRY(memcpy)
  74 #include "copy_template.S"
  75         ret
  76 ENDPIPROC(memcpy)
  77 ENDPROC(__memcpy)