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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include "wine/debug.h"
27 WINE_DEFAULT_DEBUG_CHANNEL(int);
30 * The actual work is done by a single routine.
33 static void FPU_ModifyCode(CONTEXT86 *context, BYTE Opcode);
36 /**********************************************************************
37 * DOSVM_Int34Handler (WINEDOS16.152)
39 * Handler for int 34 (FLOATING POINT EMULATION - Opcode 0xd8).
41 * The interrupt list isn't specific about what this interrupt
42 * actually does. [ interrup.m ]
44 void WINAPI DOSVM_Int34Handler(CONTEXT86 *context)
46 TRACE("Int 0x34 called-- FP opcode 0xd8");
47 FPU_ModifyCode(context, 0xd8);
51 /**********************************************************************
52 * DOSVM_Int35Handler (WINEDOS16.153)
54 * Handler for int 35 (FLOATING POINT EMULATION - Opcode 0xd9).
56 * The interrupt list isn't specific about what this interrupt
57 * actually does. [ interrup.m ]
59 void WINAPI DOSVM_Int35Handler(CONTEXT86 *context)
61 TRACE("Int 0x35 called-- FP opcode 0xd9");
62 FPU_ModifyCode(context, 0xd9);
66 /**********************************************************************
67 * DOSVM_Int36Handler (WINEDOS16.154)
69 * Handler for int 36 (FLOATING POINT EMULATION - Opcode 0xda).
71 * The interrupt list isn't specific about what this interrupt
72 * actually does. [ interrup.m ]
74 void WINAPI DOSVM_Int36Handler(CONTEXT86 *context)
76 TRACE("Int 0x36 called-- FP opcode 0xda");
77 FPU_ModifyCode(context, 0xda);
81 /**********************************************************************
82 * DOSVM_Int37Handler (WINEDOS16.155)
84 * Handler for int 37 (FLOATING POINT EMULATION - Opcode 0xdb).
86 * The interrupt list isn't specific about what this interrupt
87 * actually does. [ interrup.m ]
89 void WINAPI DOSVM_Int37Handler(CONTEXT86 *context)
91 TRACE("Int 0x37 called-- FP opcode 0xdb");
92 FPU_ModifyCode(context, 0xdb);
96 /**********************************************************************
97 * DOSVM_Int38Handler (WINEDOS16.156)
99 * Handler for int 38 (FLOATING POINT EMULATION - Opcode 0xdc).
101 * Between versions 3.0 and 5.01, the original PC-MOS API call that
102 * was here was moved to int 0xd4.
104 * The interrupt list isn't specific about what this interrupt
105 * actually does. [ interrup.m ]
107 void WINAPI DOSVM_Int38Handler(CONTEXT86 *context)
109 TRACE("Int 0x38 called-- FP opcode 0xdc");
110 FPU_ModifyCode(context, 0xdc);
114 /**********************************************************************
115 * DOSVM_Int39Handler (WINEDOS16.157)
117 * Handler for int 39 (FLOATING POINT EMULATION - Opcode 0xdd).
119 * The interrupt list isn't specific about what this interrupt
120 * actually does. [ interrup.m ]
122 void WINAPI DOSVM_Int39Handler(CONTEXT86 *context)
124 TRACE("Int 0x39 called-- FP opcode 0xdd");
125 FPU_ModifyCode(context, 0xdd);
129 /**********************************************************************
130 * DOSVM_Int3aHandler (WINEDOS16.158)
132 * Handler for int 3a (FLOATING POINT EMULATION - Opcode 0xde).
134 * The interrupt list isn't specific about what this interrupt
135 * actually does. [ interrup.m ]
137 void WINAPI DOSVM_Int3aHandler(CONTEXT86 *context)
139 TRACE("Int 0x3a called-- FP opcode 0xde");
140 FPU_ModifyCode(context, 0xde);
144 /**********************************************************************
145 * DOSVM_Int3bHandler (WINEDOS16.159)
147 * Handler for int 3B (FLOATING POINT EMULATION - Opcode 0xdf).
149 * The interrupt list isn't specific about what this interrupt
150 * actually does. [ interrup.m ]
152 void WINAPI DOSVM_Int3bHandler(CONTEXT86 *context)
154 TRACE("Int 0x3b called-- FP opcode 0xdf");
155 FPU_ModifyCode(context, 0xdf);
159 /**********************************************************************
160 * DOSVM_Int3cHandler (WINEDOS16.160)
162 * Handler for int 3C (FLOATING POINT EMULATION - INSTRUCTIONS WITH SEGMENT OVERRIDE).
164 * Generated code is CD 3C xy mm ... (CD = int | 3C = this interrupt)
165 * xy is a modified ESC code and mm is the modR/M byte.
166 * xy byte seems to be encoded as ss011xxx or ss000xxx
167 * ss= segment override.
173 * 11011xxx should be the opcode instruction.
175 void WINAPI DOSVM_Int3cHandler(CONTEXT86 *context)
177 FIXME("Int 3C NOT Implemented");
178 INT_BARF(context, 0x3c);
182 /**********************************************************************
183 * DOSVM_Int3dHandler (WINEDOS16.161)
185 * Handler for int 3D (FLOATING POINT EMULATION - Standalone FWAIT).
187 * Opcode 0x90 is a NOP. It just fills space where the 3D was.
189 void WINAPI DOSVM_Int3dHandler(CONTEXT86 *context)
191 TRACE("Int 0x3d called-- Standalone FWAIT");
192 FPU_ModifyCode(context, 0x90);
196 /**********************************************************************
197 * DOSVM_Int3eHandler (WINEDOS16.162)
199 * FLOATING POINT EMULATION -- Borland "Shortcut" call.
200 * The two bytes following the int 3E instruction are
201 * the subcode and a NOP ( 0x90 ), except for subcodes DC and DE
202 * where the second byte is the register count.
204 * Direct access 4.0 modifies and does not restore this vector.
207 void WINAPI DOSVM_Int3eHandler(CONTEXT86 *context)
209 FIXME("Int 3E NOT Implemented");
210 INT_BARF(context, 0x3e);
214 /**********************************************************************
217 * This is the function that inserts the 0x9b fwait instruction
218 * and the actual FPU opcode into the program.
221 * Code thanks to Ove Kaaven
223 static void FPU_ModifyCode(CONTEXT86 *context, BYTE Opcode)
225 WORD *stack = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
226 BYTE *code = CTX_SEG_OFF_TO_LIN(context, stack[1], stack[0]);
229 * All *NIX systems should have a real or kernel emulated FPU.
232 code[-2] = 0x9b; /* The fwait instruction */
233 code[-1] = Opcode; /* Insert the opcode */
235 if ( stack[0] < 2 ) FIXME("Backed up over a segment boundry in FPU code.");
237 stack[0] -= 2; /* back up the return address 2 bytes */
239 TRACE("Modified code in FPU int call to 0x9b 0x%x",Opcode);