ArmPkg/Library/CompilerIntrinsicsLib/Arm/uread.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
  17     EXPORT  __aeabi_uread4
  18
  19     AREA  Uread4, CODE, READONLY
  20
  21 ;
  22 ;UINT32
  23 ;EFIAPI
  24 ;__aeabi_uread4 (
  25 ;  IN VOID   *Pointer
  26 ;  );
  27 ;
  28 __aeabi_uread4
  29     ldrb    r2, [r0, #1]
  30     ldrb    r1, [r0]
  31     ldrb    r3, [r0, #2]
  32     ldrb    r0, [r0, #3]
  33     orr     r1, r1, r2, lsl #8
  34     orr     r1, r1, r3, lsl #16
  35     orr     r0, r1, r0, lsl #24
  36     bx      lr
  37
  38     END