2 * DOS interrupt 34->3e handlers. All FPU interrupt code should be
3 * moved into this file.
5 * Copyright 2002 Robert 'Admiral' Coeyman
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
24 #include "wine/debug.h"
26 WINE_DEFAULT_DEBUG_CHANNEL(int);
29 * The actual work is done by a single routine.
32 static void FPU_ModifyCode(CONTEXT86 *context, BYTE Opcode);
35 /**********************************************************************
38 * Handler for int 34 (FLOATING POINT EMULATION - Opcode 0xd8).
40 * The interrupt list isn't specific about what this interrupt
41 * actually does. [ interrup.m ]
43 void WINAPI DOSVM_Int34Handler(CONTEXT86 *context)
45 TRACE("Int 0x34 called-- FP opcode 0xd8\n");
46 FPU_ModifyCode(context, 0xd8);
50 /**********************************************************************
53 * Handler for int 35 (FLOATING POINT EMULATION - Opcode 0xd9).
55 * The interrupt list isn't specific about what this interrupt
56 * actually does. [ interrup.m ]
58 void WINAPI DOSVM_Int35Handler(CONTEXT86 *context)
60 TRACE("Int 0x35 called-- FP opcode 0xd9\n");
61 FPU_ModifyCode(context, 0xd9);
65 /**********************************************************************
68 * Handler for int 36 (FLOATING POINT EMULATION - Opcode 0xda).
70 * The interrupt list isn't specific about what this interrupt
71 * actually does. [ interrup.m ]
73 void WINAPI DOSVM_Int36Handler(CONTEXT86 *context)
75 TRACE("Int 0x36 called-- FP opcode 0xda\n");
76 FPU_ModifyCode(context, 0xda);
80 /**********************************************************************
83 * Handler for int 37 (FLOATING POINT EMULATION - Opcode 0xdb).
85 * The interrupt list isn't specific about what this interrupt
86 * actually does. [ interrup.m ]
88 void WINAPI DOSVM_Int37Handler(CONTEXT86 *context)
90 TRACE("Int 0x37 called-- FP opcode 0xdb\n");
91 FPU_ModifyCode(context, 0xdb);
95 /**********************************************************************
98 * Handler for int 38 (FLOATING POINT EMULATION - Opcode 0xdc).
100 * Between versions 3.0 and 5.01, the original PC-MOS API call that
101 * was here was moved to int 0xd4.
103 * The interrupt list isn't specific about what this interrupt
104 * actually does. [ interrup.m ]
106 void WINAPI DOSVM_Int38Handler(CONTEXT86 *context)
108 TRACE("Int 0x38 called-- FP opcode 0xdc\n");
109 FPU_ModifyCode(context, 0xdc);
113 /**********************************************************************
116 * Handler for int 39 (FLOATING POINT EMULATION - Opcode 0xdd).
118 * The interrupt list isn't specific about what this interrupt
119 * actually does. [ interrup.m ]
121 void WINAPI DOSVM_Int39Handler(CONTEXT86 *context)
123 TRACE("Int 0x39 called-- FP opcode 0xdd\n");
124 FPU_ModifyCode(context, 0xdd);
128 /**********************************************************************
131 * Handler for int 3a (FLOATING POINT EMULATION - Opcode 0xde).
133 * The interrupt list isn't specific about what this interrupt
134 * actually does. [ interrup.m ]
136 void WINAPI DOSVM_Int3aHandler(CONTEXT86 *context)
138 TRACE("Int 0x3a called-- FP opcode 0xde\n");
139 FPU_ModifyCode(context, 0xde);
143 /**********************************************************************
146 * Handler for int 3B (FLOATING POINT EMULATION - Opcode 0xdf).
148 * The interrupt list isn't specific about what this interrupt
149 * actually does. [ interrup.m ]
151 void WINAPI DOSVM_Int3bHandler(CONTEXT86 *context)
153 TRACE("Int 0x3b called-- FP opcode 0xdf\n");
154 FPU_ModifyCode(context, 0xdf);
158 /**********************************************************************
161 * Handler for int 3C (FLOATING POINT EMULATION - INSTRUCTIONS WITH SEGMENT OVERRIDE).
163 * Generated code is CD 3C xy mm ... (CD = int | 3C = this interrupt)
164 * xy is a modified ESC code and mm is the modR/M byte.
165 * xy byte seems to be encoded as ss011xxx or ss000xxx
166 * ss= segment override.
172 * 11011xxx should be the opcode instruction.
174 void WINAPI DOSVM_Int3cHandler(CONTEXT86 *context)
176 FIXME("Int 3C NOT Implemented\n");
177 INT_BARF(context, 0x3c);
181 /**********************************************************************
184 * Handler for int 3D (FLOATING POINT EMULATION - Standalone FWAIT).
186 * Opcode 0x90 is a NOP. It just fills space where the 3D was.
188 void WINAPI DOSVM_Int3dHandler(CONTEXT86 *context)
190 TRACE("Int 0x3d called-- Standalone FWAIT\n");
191 FPU_ModifyCode(context, 0x90);
195 /**********************************************************************
198 * FLOATING POINT EMULATION -- Borland "Shortcut" call.
199 * The two bytes following the int 3E instruction are
200 * the subcode and a NOP ( 0x90 ), except for subcodes DC and DE
201 * where the second byte is the register count.
203 * Direct access 4.0 modifies and does not restore this vector.
206 void WINAPI DOSVM_Int3eHandler(CONTEXT86 *context)
208 FIXME("Int 3E NOT Implemented\n");
209 INT_BARF(context, 0x3e);
213 /**********************************************************************
216 * This is the function that inserts the 0x9b fwait instruction
217 * and the actual FPU opcode into the program.
220 * Code thanks to Ove Kaaven
222 static void FPU_ModifyCode(CONTEXT86 *context, BYTE Opcode)
224 BYTE *code = CTX_SEG_OFF_TO_LIN(context, context->SegCs, context->Eip);
227 * All *NIX systems should have a real or kernel emulated FPU.
230 code[-2] = 0x9b; /* The fwait instruction */
231 code[-1] = Opcode; /* Insert the opcode */
233 if ( ISV86(context) && LOWORD(context->Eip) < 2 )
234 FIXME("Backed up over a real mode segment boundary in FPU code.\n");
236 context->Eip -= 2; /* back up the return address 2 bytes */
238 TRACE("Modified code in FPU int call to 0x9b 0x%x\n",Opcode);