MdePkg/Library/BaseLib/Ia32/DivU64x32Remainder.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   DivError.asm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   Set error flag for all division functions
  13 ;
  14 ;------------------------------------------------------------------------------
  15
  16     SECTION .text
  17
  18 ;------------------------------------------------------------------------------
  19 ; UINT64
  20 ; EFIAPI
  21 ; InternalMathDivRemU64x32 (
  22 ;   IN      UINT64                    Dividend,
  23 ;   IN      UINT32                    Divisor,
  24 ;   OUT     UINT32                    *Remainder
  25 ;   );
  26 ;------------------------------------------------------------------------------
  27 global ASM_PFX(InternalMathDivRemU64x32)
  28 ASM_PFX(InternalMathDivRemU64x32):
  29     mov     ecx, [esp + 12]         ; ecx <- divisor
  30     mov     eax, [esp + 8]          ; eax <- dividend[32..63]
  31     xor     edx, edx
  32     div     ecx                     ; eax <- quotient[32..63], edx <- remainder
  33     push    eax
  34     mov     eax, [esp + 8]          ; eax <- dividend[0..31]
  35     div     ecx                     ; eax <- quotient[0..31]
  36     mov     ecx, [esp + 20]         ; ecx <- Remainder
  37     jecxz   .0                      ; abandon remainder if Remainder == NULL
  38     mov     [ecx], edx
  39 .0:
  40     pop     edx                     ; edx <- quotient[32..63]
  41     ret
  42