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 #  SPDX-License-Identifier: BSD-2-Clause-Patent
   6 #
   7 #**/
   8 #
   9
  10 #include <AsmMacroIoLib.h>
  11
  12 .syntax unified
  13
  14 ASM_FUNC(__switch16)
  15     ldrh      ip, [lr, #-1]
  16     cmp       r0, ip
  17     add       r0, lr, r0, lsl #1
  18     ldrshcc   r0, [r0, #1]
  19     add       ip, lr, ip, lsl #1
  20     ldrshcs   r0, [ip, #1]
  21     add       ip, lr, r0, lsl #1
  22     bx        ip
  23
  24