ArmPkg/Library/CompilerIntrinsicsLib/Arm/switch.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  __ARM_switch8
  18
  19     AREA  ArmSwitch, CODE, READONLY
  20
  21 __ARM_switch8
  22   LDRB    r12,[lr,#-1]
  23   CMP      r3,r12
  24   LDRBCC  r3,[lr,r3]
  25   LDRBCS  r3,[lr,r12]
  26   ADD      r12,lr,r3,LSL #1
  27   BX      r12
  28
  29     END