ArmPkg/Library/CompilerIntrinsicsLib/Arm/ldivmod.S

   1 //------------------------------------------------------------------------------
   2 //
   3 // Copyright (c) 2008 - 2009, Apple Inc. 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
  16         .text
  17         .align 2
  18         GCC_ASM_EXPORT(__aeabi_ldivmod)
  19
  20 //
  21 // A pair of (unsigned) long longs is returned in {{r0, r1}, {r2, r3}},
  22 //  the quotient in {r0, r1}, and the remainder in {r2, r3}.
  23 //
  24 //__value_in_regs lldiv_t
  25 //EFIAPI
  26 //__aeabi_ldivmod (
  27 //  IN UINT64  Dividen
  28 //  IN UINT64  Divisor
  29 //  )//
  30 //
  31
  32 ASM_PFX(__aeabi_ldivmod):
  33     push     {r4,lr}
  34     asrs     r4,r1,#1
  35     eor      r4,r4,r3,LSR #1
  36     bpl      L_Test1
  37     rsbs     r0,r0,#0
  38     rsc      r1,r1,#0
  39 L_Test1:
  40     tst      r3,r3
  41     bpl      L_Test2
  42     rsbs     r2,r2,#0
  43     rsc      r3,r3,#0
  44 L_Test2:
  45     bl       ASM_PFX(__aeabi_uldivmod)
  46     tst      r4,#0x40000000
  47     beq      L_Test3
  48     rsbs     r0,r0,#0
  49     rsc      r1,r1,#0
  50 L_Test3:
  51     tst      r4,#0x80000000
  52     beq      L_Exit
  53     rsbs     r2,r2,#0
  54     rsc      r3,r3,#0
  55 L_Exit:
  56     pop      {r4,pc}
  57
  58
  59