root/arch/arm/lib/memcpy.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  linux/arch/arm/lib/memcpy.S
   4  *
   5  *  Author:     Nicolas Pitre
   6  *  Created:    Sep 28, 2005
   7  *  Copyright:  MontaVista Software, Inc.
   8  */
   9 
  10 #include <linux/linkage.h>
  11 #include <asm/assembler.h>
  12 #include <asm/unwind.h>
  13 
  14 #define LDR1W_SHIFT     0
  15 #define STR1W_SHIFT     0
  16 
  17         .macro ldr1w ptr reg abort
  18         W(ldr) \reg, [\ptr], #4
  19         .endm
  20 
  21         .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
  22         ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
  23         .endm
  24 
  25         .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
  26         ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
  27         .endm
  28 
  29         .macro ldr1b ptr reg cond=al abort
  30         ldrb\cond \reg, [\ptr], #1
  31         .endm
  32 
  33         .macro str1w ptr reg abort
  34         W(str) \reg, [\ptr], #4
  35         .endm
  36 
  37         .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
  38         stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
  39         .endm
  40 
  41         .macro str1b ptr reg cond=al abort
  42         strb\cond \reg, [\ptr], #1
  43         .endm
  44 
  45         .macro enter reg1 reg2
  46         stmdb sp!, {r0, \reg1, \reg2}
  47         .endm
  48 
  49         .macro usave reg1 reg2
  50         UNWIND( .save   {r0, \reg1, \reg2}      )
  51         .endm
  52 
  53         .macro exit reg1 reg2
  54         ldmfd sp!, {r0, \reg1, \reg2}
  55         .endm
  56 
  57         .text
  58 
  59 /* Prototype: void *memcpy(void *dest, const void *src, size_t n); */
  60 
  61 ENTRY(mmiocpy)
  62 ENTRY(memcpy)
  63 
  64 #include "copy_template.S"
  65 
  66 ENDPROC(memcpy)
  67 ENDPROC(mmiocpy)