ArmPkg/Library/CompilerIntrinsicsLib/Arm/uwrite.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     EXPORT  __aeabi_uwrite4
  17     EXPORT  __aeabi_uwrite8
  18
  19     AREA  Uwrite4, CODE, READONLY
  20
  21 ;
  22 ;UINT32
  23 ;EFIAPI
  24 ;__aeabi_uwrite4 (
  25 ;  IN UINT32 Data,
  26 ;  IN VOID   *Pointer
  27 ;  );
  28 ;
  29 ;
  30 __aeabi_uwrite4
  31     mov     r2, r0, lsr #8
  32     strb    r0, [r1]
  33     strb    r2, [r1, #1]
  34     mov     r2, r0, lsr #16
  35     strb    r2, [r1, #2]
  36     mov     r2, r0, lsr #24
  37     strb    r2, [r1, #3]
  38     bx      lr
  39
  40 ;
  41 ;UINT64
  42 ;EFIAPI
  43 ;__aeabi_uwrite8 (
  44 ;  IN UINT64 Data,    //r0-r1
  45 ;  IN VOID   *Pointer //r2
  46 ;  );
  47 ;
  48 ;
  49 __aeabi_uwrite8
  50     mov     r3, r0, lsr #8
  51     strb    r0, [r2]
  52     strb    r3, [r2, #1]
  53     mov     r3, r0, lsr #16
  54     strb    r3, [r2, #2]
  55     mov     r3, r0, lsr #24
  56     strb    r3, [r2, #3]
  57
  58     mov     r3, r1, lsr #8
  59     strb    r1, [r2, #4]
  60     strb    r3, [r2, #5]
  61     mov     r3, r1, lsr #16
  62     strb    r3, [r2, #6]
  63     mov     r3, r1, lsr #24
  64     strb    r3, [r2, #7]
  65     bx      lr
  66
  67     END
  68