gnu-efi/lib/arm/llsr.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2013, ARM. 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 #include "edk2asm.h"
  16
  17 .text
  18 .align 2
  19 GCC_ASM_EXPORT(__aeabi_llsr)
  20
  21 #
  22 #VOID
  23 #EFIAPI
  24 #__aeabi_llsr (
  25 # IN  VOID    *Destination,
  26 # IN  VOID    *Source,
  27 # IN  UINT32  Size
  28 # );
  29 #
  30 ASM_PFX(__aeabi_llsr):
  31     subs     r3,r2,#0x20
  32     bpl      1f
  33     rsb      r3,r2,#0x20
  34     lsr      r0,r0,r2
  35     orr      r0,r0,r1,lsl r3
  36     lsr      r1,r1,r2
  37     bx       lr
  38 1:
  39     lsr      r0,r1,r3
  40     mov      r1,#0
  41     bx       lr