ArmPkg/Library/CompilerIntrinsicsLib/Arm/switch16.S

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   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.
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  14
  15 #/** @file
  16 #  Compiler intrinsic for ARM compiler
  17 #
  18 #  Copyright (c) 2008, Apple, Inc.
  19 #  All rights reserved. This program and the accompanying materials
  20 #  are licensed and made available under the terms and conditions of the BSD License
  21 #  which accompanies this distribution.  The full text of the license may be found at
  22 #  http)://opensource.org/licenses/bsd-license.php
  23 #
  24 #  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  25 #  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.;
  26 #
  27 #**/
  28 #
  29
  30 .text
  31 .p2align 2
  32
  33 .globl ASM_PFX(__switch16)
  34
  35
  36 ASM_PFX(__switch16):
  37     ldrh      ip, [lr, #-1]
  38     cmp       r0, ip
  39     add       r0, lr, r0, lsl #1
  40     ldrccsh   r0, [r0, #1]
  41     add       ip, lr, ip, lsl #1
  42     ldrcssh   r0, [ip, #1]
  43     add       ip, lr, r0, lsl #1
  44     bx        ip
  45
  46