wine/dlls/krnl386.exe16/fpu.c
2010-10-20 18:37:09 +02:00

240 lines
6.8 KiB
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);
}