ArmPkg/Library/CompilerIntrinsicsLib/Arm/uread.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     EXPORT  __aeabi_uread4
  18     EXPORT  __aeabi_uread8
  19
  20     AREA  Uread4, CODE, READONLY
  21
  22 ;
  23 ;UINT32
  24 ;EFIAPI
  25 ;__aeabi_uread4 (
  26 ;  IN VOID   *Pointer
  27 ;  );
  28 ;
  29 __aeabi_uread4
  30     ldrb    r1, [r0]
  31     ldrb    r2, [r0, #1]
  32     ldrb    r3, [r0, #2]
  33     ldrb    r0, [r0, #3]
  34     orr     r1, r1, r2, lsl #8
  35     orr     r1, r1, r3, lsl #16
  36     orr     r0, r1, r0, lsl #24
  37     bx      lr
  38
  39 ;
  40 ;UINT64
  41 ;EFIAPI
  42 ;__aeabi_uread8 (
  43 ;  IN VOID   *Pointer
  44 ;  );
  45 ;
  46 __aeabi_uread8
  47     mov     r3, r0
  48
  49     ldrb    r1, [r3]
  50     ldrb    r2, [r3, #1]
  51     orr     r1, r1, r2, lsl #8
  52     ldrb    r2, [r3, #2]
  53     orr     r1, r1, r2, lsl #16
  54     ldrb    r0, [r3, #3]
  55     orr     r0, r1, r0, lsl #24
  56
  57     ldrb    r1, [r3, #4]
  58     ldrb    r2, [r3, #5]
  59     orr     r1, r1, r2, lsl #8
  60     ldrb    r2, [r3, #6]
  61     orr     r1, r1, r2, lsl #16
  62     ldrb    r2, [r3, #7]
  63     orr     r1, r1, r2, lsl #24
  64
  65     bx      lr
  66     END