reactos/ntoskrnl/rtl/i386/allmul.s

   1 /* $Id$
   2  *
   3  * COPYRIGHT:         See COPYING in the top level directory
   4  * PROJECT:           ReactOS kernel
   5  * PURPOSE:           Math support for IA-32
   6  * FILE:              ntoskrnl/rtl/i386/allmul.s
   7  * PROGRAMER:         Eric Kohl (ekohl@rz-online.de)
   8  */
   9
  10 /*
  11  * long long
  12  * __allmul(long long Multiplier, long long Multiplicand);
  13  *
  14  * Parameters:
  15  *   [ESP+04h] - long long Multiplier
  16  *   [ESP+0Ch] - long long Multiplicand
  17  * Registers:
  18  *   Unknown
  19  * Returns:
  20  *   EDX:EAX - long long product (Multiplier*Multiplicand)
  21  * Notes:
  22  *   Routine removes the arguments from the stack.
  23  */
  24 .globl __allmul
  25 __allmul:
  26         pushl   %ebp
  27         movl    %esp, %ebp
  28         pushl   %edi
  29         pushl   %esi
  30         pushl   %ebx
  31         subl    $12, %esp
  32         movl    16(%ebp), %ebx
  33         movl    8(%ebp), %eax
  34         mull    %ebx
  35         movl    20(%ebp), %ecx
  36         movl    %eax, -24(%ebp)
  37         movl    8(%ebp), %eax
  38         movl    %edx, %esi
  39         imull   %ecx, %eax
  40         addl    %eax, %esi
  41         movl    12(%ebp), %eax
  42         imull   %eax, %ebx
  43         leal    (%ebx,%esi), %eax
  44         movl    %eax, -20(%ebp)
  45         movl    -24(%ebp), %eax
  46         movl    -20(%ebp), %edx
  47         addl    $12, %esp
  48         popl    %ebx
  49         popl    %esi
  50         popl    %edi
  51         popl    %ebp
  52         ret             $0x10
  53
  54 /* EOF */