root/arch/arm64/lib/memcpy.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2013 ARM Ltd.
   4  * Copyright (C) 2013 Linaro.
   5  *
   6  * This code is based on glibc cortex strings work originally authored by Linaro
   7  * be found @
   8  *
   9  * http://bazaar.launchpad.net/~linaro-toolchain-dev/cortex-strings/trunk/
  10  * files/head:/src/aarch64/
  11  */
  12 
  13 #include <linux/linkage.h>
  14 #include <asm/assembler.h>
  15 #include <asm/cache.h>
  16 
  17 /*
  18  * Copy a buffer from src to dest (alignment handled by the hardware)
  19  *
  20  * Parameters:
  21  *      x0 - dest
  22  *      x1 - src
  23  *      x2 - n
  24  * Returns:
  25  *      x0 - dest
  26  */
  27         .macro ldrb1 ptr, regB, val
  28         ldrb  \ptr, [\regB], \val
  29         .endm
  30 
  31         .macro strb1 ptr, regB, val
  32         strb \ptr, [\regB], \val
  33         .endm
  34 
  35         .macro ldrh1 ptr, regB, val
  36         ldrh  \ptr, [\regB], \val
  37         .endm
  38 
  39         .macro strh1 ptr, regB, val
  40         strh \ptr, [\regB], \val
  41         .endm
  42 
  43         .macro ldr1 ptr, regB, val
  44         ldr \ptr, [\regB], \val
  45         .endm
  46 
  47         .macro str1 ptr, regB, val
  48         str \ptr, [\regB], \val
  49         .endm
  50 
  51         .macro ldp1 ptr, regB, regC, val
  52         ldp \ptr, \regB, [\regC], \val
  53         .endm
  54 
  55         .macro stp1 ptr, regB, regC, val
  56         stp \ptr, \regB, [\regC], \val
  57         .endm
  58 
  59         .weak memcpy
  60 ENTRY(__memcpy)
  61 ENTRY(memcpy)
  62 #include "copy_template.S"
  63         ret
  64 ENDPIPROC(memcpy)
  65 EXPORT_SYMBOL(memcpy)
  66 ENDPROC(__memcpy)
  67 EXPORT_SYMBOL(__memcpy)