MdePkg/Library/BaseLib/Ia32/DivU64x32Remainder.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; This program and the accompanying materials
   5 ; are licensed and made available under the terms and conditions of the BSD License
   6 ; which accompanies this distribution.  The full text of the license may be found at
   7 ; http://opensource.org/licenses/bsd-license.php.
   8 ;
   9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 ;
  12 ; Module Name:
  13 ;
  14 ;   DivError.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   Set error flag for all division functions
  19 ;
  20 ;------------------------------------------------------------------------------
  21
  22     SECTION .text
  23
  24 ;------------------------------------------------------------------------------
  25 ; UINT64
  26 ; EFIAPI
  27 ; InternalMathDivRemU64x32 (
  28 ;   IN      UINT64                    Dividend,
  29 ;   IN      UINT32                    Divisor,
  30 ;   OUT     UINT32                    *Remainder
  31 ;   );
  32 ;------------------------------------------------------------------------------
  33 global ASM_PFX(InternalMathDivRemU64x32)
  34 ASM_PFX(InternalMathDivRemU64x32):
  35     mov     ecx, [esp + 12]         ; ecx <- divisor
  36     mov     eax, [esp + 8]          ; eax <- dividend[32..63]
  37     xor     edx, edx
  38     div     ecx                     ; eax <- quotient[32..63], edx <- remainder
  39     push    eax
  40     mov     eax, [esp + 8]          ; eax <- dividend[0..31]
  41     div     ecx                     ; eax <- quotient[0..31]
  42     mov     ecx, [esp + 20]         ; ecx <- Remainder
  43     jecxz   .0                      ; abandon remainder if Remainder == NULL
  44     mov     [ecx], edx
  45 .0:
  46     pop     edx                     ; edx <- quotient[32..63]
  47     ret
  48