ArmPkg/Library/CompilerIntrinsicsLib/Arm/uread.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4 #
   5 # SPDX-License-Identifier: BSD-2-Clause-Patent
   6 #
   7 #------------------------------------------------------------------------------
   8
   9 #include <AsmMacroIoLib.h>
  10
  11 #
  12 #UINT32
  13 #EFIAPI
  14 #__aeabi_uread4 (
  15 #  IN VOID   *Pointer
  16 #  );
  17 #
  18 ASM_FUNC(__aeabi_uread4)
  19     ldrb    r1, [r0]
  20     ldrb    r2, [r0, #1]
  21     ldrb    r3, [r0, #2]
  22     ldrb    r0, [r0, #3]
  23     orr     r1, r1, r2, lsl #8
  24     orr     r1, r1, r3, lsl #16
  25     orr     r0, r1, r0, lsl #24
  26     bx      lr
  27
  28 #
  29 #UINT64
  30 #EFIAPI
  31 #__aeabi_uread8 (
  32 #  IN VOID   *Pointer
  33 #  );
  34 #
  35 ASM_FUNC(__aeabi_uread8)
  36     mov     r3, r0
  37
  38     ldrb    r1, [r3]
  39     ldrb    r2, [r3, #1]
  40     orr     r1, r1, r2, lsl #8
  41     ldrb    r2, [r3, #2]
  42     orr     r1, r1, r2, lsl #16
  43     ldrb    r0, [r3, #3]
  44     orr     r0, r1, r0, lsl #24
  45
  46     ldrb    r1, [r3, #4]
  47     ldrb    r2, [r3, #5]
  48     orr     r1, r1, r2, lsl #8
  49     ldrb    r2, [r3, #6]
  50     orr     r1, r1, r2, lsl #16
  51     ldrb    r2, [r3, #7]
  52     orr     r1, r1, r2, lsl #24
  53
  54     bx      lr