ArmPkg/Library/CompilerIntrinsicsLib/Arm/switch16.S

   1 #/** @file
   2 #  Compiler intrinsic for ARM compiler
   3 #
   4 #  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   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 .text
  17 .p2align 2
  18
  19 GCC_ASM_EXPORT(__switch16)
  20
  21 ASM_PFX(__switch16):
  22     ldrh      ip, [lr, #-1]
  23     cmp       r0, ip
  24     add       r0, lr, r0, lsl #1
  25     ldrccsh   r0, [r0, #1]
  26     add       ip, lr, ip, lsl #1
  27     ldrcssh   r0, [ip, #1]
  28     add       ip, lr, r0, lsl #1
  29     bx        ip
  30
  31