ArmPkg/Library/CompilerIntrinsicsLib/Arm/memcpy4.asm

   1 //------------------------------------------------------------------------------
   2 //
   3 // Copyright (c) 2008-2009 Apple Inc. All rights reserved.
   4 //
   5 // All rights reserved. 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     EXPORT  __aeabi_memcpy4
  17
  18     AREA    Memcpy4, CODE, READONLY
  19
  20 ;
  21 ;VOID
  22 ;EFIAPI
  23 ;__aeabi_memcpy (
  24 ; IN  VOID    *Destination,
  25 ; IN  VOID    *Source,
  26 ; IN  UINT32  Size
  27 ; );
  28 ;
  29 __aeabi_memcpy4
  30     stmdb   sp!, {r4, lr}
  31     subs    r2, r2, #32     ; 0x20
  32     bcc     memcpy4_label2
  33 memcpy4_label1
  34     ldmcsia r1!, {r3, r4, ip, lr}
  35     stmcsia r0!, {r3, r4, ip, lr}
  36     ldmcsia r1!, {r3, r4, ip, lr}
  37     stmcsia r0!, {r3, r4, ip, lr}
  38     subcss  r2, r2, #32     ; 0x20
  39     bcs     memcpy4_label1
  40 memcpy4_label2
  41     movs    ip, r2, lsl #28
  42     ldmcsia r1!, {r3, r4, ip, lr}
  43     stmcsia r0!, {r3, r4, ip, lr}
  44     ldmmiia r1!, {r3, r4}
  45     stmmiia r0!, {r3, r4}
  46     ldmia   sp!, {r4, lr}
  47     movs    ip, r2, lsl #30
  48     ldrcs   r3, [r1], #4
  49     strcs   r3, [r0], #4
  50     bxeq    lr
  51
  52 _memcpy4_lastbytes_aligned
  53     movs    r2, r2, lsl #31
  54     ldrcsh  r3, [r1], #2
  55     ldrmib  r2, [r1], #1
  56     strcsh  r3, [r0], #2
  57     strmib  r2, [r0], #1
  58     bx      lr
  59
  60     END
  61