Wine Cross Reference
wine/dlls/krnl386.exe16/fpu.c

   /*
    * DOS interrupt 34->3e handlers.  All FPU interrupt code should be
    * moved into this file.
    *
    * Copyright 2002 Robert 'Admiral' Coeyman
    *
    * This library is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Lesser General Public
    * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
   */
  
  #include <stdlib.h>
  #include "dosexe.h"
  #include "wine/debug.h"
  
  WINE_DEFAULT_DEBUG_CHANNEL(int);
  
  /*
   *  The actual work is done by a single routine.
   */
  
  static void FPU_ModifyCode(CONTEXT *context, BYTE Opcode);
  
  
  /**********************************************************************
   *          DOSVM_Int34Handler
   *
   * Handler for int 34 (FLOATING POINT EMULATION - Opcode 0xd8).
   *
   *  The interrupt list isn't specific about what this interrupt
   *  actually does. [ interrup.m ]
   */
  void WINAPI DOSVM_Int34Handler(CONTEXT *context)
  {
      TRACE("Int 0x34 called-- FP opcode 0xd8\n");
      FPU_ModifyCode(context, 0xd8);
  }
  
  
  /**********************************************************************
   *          DOSVM_Int35Handler
   *
   * Handler for int 35 (FLOATING POINT EMULATION - Opcode 0xd9).
   *
   *  The interrupt list isn't specific about what this interrupt
   *  actually does. [ interrup.m ]
   */
  void WINAPI DOSVM_Int35Handler(CONTEXT *context)
  {
      TRACE("Int 0x35 called-- FP opcode 0xd9\n");
      FPU_ModifyCode(context, 0xd9);
  }
  
  
  /**********************************************************************
   *          DOSVM_Int36Handler
   *
   * Handler for int 36 (FLOATING POINT EMULATION - Opcode 0xda).
   *
   *  The interrupt list isn't specific about what this interrupt
   *  actually does. [ interrup.m ]
   */
  void WINAPI DOSVM_Int36Handler(CONTEXT *context)
  {
      TRACE("Int 0x36 called-- FP opcode 0xda\n");
      FPU_ModifyCode(context, 0xda);
  }
  
  
  /**********************************************************************
   *          DOSVM_Int37Handler
   *
   * Handler for int 37 (FLOATING POINT EMULATION - Opcode 0xdb).
   *
   *  The interrupt list isn't specific about what this interrupt
   *  actually does. [ interrup.m ]
   */
  void WINAPI DOSVM_Int37Handler(CONTEXT *context)
  {
      TRACE("Int 0x37 called-- FP opcode 0xdb\n");
      FPU_ModifyCode(context, 0xdb);
  }
  
  
  /**********************************************************************
   *          DOSVM_Int38Handler
   *
   * Handler for int 38 (FLOATING POINT EMULATION - Opcode 0xdc).
   *
  *  Between versions 3.0 and 5.01, the original PC-MOS API call that
  *  was here was moved to int 0xd4.
  *
  *  The interrupt list isn't specific about what this interrupt
  *  actually does. [ interrup.m ]
  */
 void WINAPI DOSVM_Int38Handler(CONTEXT *context)
 {
     TRACE("Int 0x38 called-- FP opcode 0xdc\n");
     FPU_ModifyCode(context, 0xdc);
 }
 
 
 /**********************************************************************
  *          DOSVM_Int39Handler
  *
  * Handler for int 39 (FLOATING POINT EMULATION - Opcode 0xdd).
  *
  *  The interrupt list isn't specific about what this interrupt
  *  actually does. [ interrup.m ]
  */
 void WINAPI DOSVM_Int39Handler(CONTEXT *context)
 {
     TRACE("Int 0x39 called-- FP opcode 0xdd\n");
     FPU_ModifyCode(context, 0xdd);
 }
 
 
 /**********************************************************************
  *          DOSVM_Int3aHandler
  *
  * Handler for int 3a (FLOATING POINT EMULATION - Opcode 0xde).
  *
  *  The interrupt list isn't specific about what this interrupt
  *  actually does. [ interrup.m ]
  */
 void WINAPI DOSVM_Int3aHandler(CONTEXT *context)
 {
     TRACE("Int 0x3a called-- FP opcode 0xde\n");
     FPU_ModifyCode(context, 0xde);
 }
 
 
 /**********************************************************************
  *          DOSVM_Int3bHandler
  *
  * Handler for int 3B (FLOATING POINT EMULATION - Opcode 0xdf).
  *
  *  The interrupt list isn't specific about what this interrupt
  *  actually does. [ interrup.m ]
  */
 void WINAPI DOSVM_Int3bHandler(CONTEXT *context)
 {
     TRACE("Int 0x3b called-- FP opcode 0xdf\n");
     FPU_ModifyCode(context, 0xdf);
 }
 
 
 /**********************************************************************
  *          DOSVM_Int3cHandler
  *
  * Handler for int 3C (FLOATING POINT EMULATION - INSTRUCTIONS WITH SEGMENT OVERRIDE).
  *
  *  Generated code is CD 3C xy mm ... (CD = int | 3C = this interrupt)
  *   xy is a modified ESC code and mm is the modR/M byte.
  *   xy byte seems to be encoded as ss011xxx  or ss000xxx
  *   ss= segment override.
  *     00 -> DS
  *     01 -> SS
  *     10 -> CS
  *     11 -> ES
  *
  *  11011xxx should be the opcode instruction.
  */
 void WINAPI DOSVM_Int3cHandler(CONTEXT *context)
 {
     FIXME("Int 3C NOT Implemented\n");
     INT_BARF(context, 0x3c);
 }
 
 
 /**********************************************************************
  *          DOSVM_Int3dHandler
  *
  * Handler for int 3D (FLOATING POINT EMULATION - Standalone FWAIT).
  *
  *  Opcode 0x90 is a NOP.  It just fills space where the 3D was.
  */
 void WINAPI DOSVM_Int3dHandler(CONTEXT *context)
 {
     TRACE("Int 0x3d called-- Standalone FWAIT\n");
     FPU_ModifyCode(context, 0x90);
 }
 
 
 /**********************************************************************
  *          DOSVM_Int3eHandler
  *
  * FLOATING POINT EMULATION -- Borland "Shortcut" call.
  *  The two bytes following the int 3E instruction are
  *  the subcode and a NOP ( 0x90 ), except for subcodes DC and DE
  *  where the second byte is the register count.
  *
  *  Direct access 4.0 modifies and does not restore this vector.
  *
  */
 void WINAPI DOSVM_Int3eHandler(CONTEXT *context)
 {
     FIXME("Int 3E NOT Implemented\n");
     INT_BARF(context, 0x3e);
 }
 
 
 /**********************************************************************
  *          FPU_ModifyCode
  *
  *   This is the function that inserts the 0x9b fwait instruction
  *   and the actual FPU opcode into the program.
  *           -A.C.
  *
  *               Code thanks to Ove Kaaven
  */
 static void FPU_ModifyCode(CONTEXT *context, BYTE Opcode)
 {
     BYTE *code = CTX_SEG_OFF_TO_LIN(context, context->SegCs, context->Eip);
 
     /*
      * All *NIX systems should have a real or kernel emulated FPU.
      */
 
     code[-2] = 0x9b;          /* The fwait instruction */
     code[-1] = Opcode;        /* Insert the opcode     */
 
     if ( ISV86(context) && LOWORD(context->Eip) < 2 )
         FIXME("Backed up over a real mode segment boundary in FPU code.\n");
 
     context->Eip -= 2; /* back up the return address 2 bytes */
 
     TRACE("Modified code in FPU int call to 0x9b 0x%x\n",Opcode);
 }