ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy4.asm

   1 //------------------------------------------------------------------------------
   2 //
   3 // Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4 //
   5 // This program and the accompanying materials
   6 // are licensed and made available under the terms and conditions of the BSD License
   7 // which accompanies this distribution.  The full text of the license may be found at
   8 // http://opensource.org/licenses/bsd-license.php
   9 //
  10 // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 //
  13 //------------------------------------------------------------------------------
  14
  15
  16
  17     INCLUDE AsmMacroExport.inc
  18
  19 ;
  20 ;VOID
  21 ;EFIAPI
  22 ;__aeabi_memcpy (
  23 ; IN  VOID    *Destination,
  24 ; IN  VOID    *Source,
  25 ; IN  UINT32  Size
  26 ; );
  27 ;
  28  RVCT_ASM_EXPORT __aeabi_memcpy4
  29     stmdb   sp!, {r4, lr}
  30     subs    r2, r2, #32     ; 0x20
  31     bcc     memcpy4_label2
  32 memcpy4_label1
  33     ldmcsia r1!, {r3, r4, ip, lr}
  34     stmcsia r0!, {r3, r4, ip, lr}
  35     ldmcsia r1!, {r3, r4, ip, lr}
  36     stmcsia r0!, {r3, r4, ip, lr}
  37     subcss  r2, r2, #32     ; 0x20
  38     bcs     memcpy4_label1
  39 memcpy4_label2
  40     movs    ip, r2, lsl #28
  41     ldmcsia r1!, {r3, r4, ip, lr}
  42     stmcsia r0!, {r3, r4, ip, lr}
  43     ldmmiia r1!, {r3, r4}
  44     stmmiia r0!, {r3, r4}
  45     ldmia   sp!, {r4, lr}
  46     movs    ip, r2, lsl #30
  47     ldrcs   r3, [r1], #4
  48     strcs   r3, [r0], #4
  49     bxeq    lr
  50
  51 _memcpy4_lastbytes_aligned
  52     movs    r2, r2, lsl #31
  53     ldrcsh  r3, [r1], #2
  54     ldrmib  r2, [r1], #1
  55     strcsh  r3, [r0], #2
  56     strmib  r2, [r0], #1
  57     bx      lr
  58
  59     END
  60