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