1 /* 2 * Fast486 386/486 CPU Emulation Library 3 * fast486dbg.c 4 * 5 * Copyright (C) 2015 Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 2 10 * of the License, or (at your option) any later version. 11 * 12 * This program 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 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 20 */ 21 22 /* INCLUDES *******************************************************************/ 23 24 #include <windef.h> 25 26 // #define NDEBUG 27 #include <debug.h> 28 29 #include <fast486.h> 30 #include "common.h" 31 #include "opcodes.h" 32 #include "fpu.h" 33 34 /* DEFINES ********************************************************************/ 35 36 typedef enum 37 { 38 FAST486_STEP_INTO, 39 FAST486_STEP_OVER, 40 FAST486_STEP_OUT, 41 FAST486_CONTINUE 42 } FAST486_EXEC_CMD; 43 44 /* PRIVATE FUNCTIONS **********************************************************/ 45 46 FORCEINLINE 47 VOID 48 FASTCALL 49 Fast486ExecutionControl(PFAST486_STATE State, FAST486_EXEC_CMD Command) 50 { 51 UCHAR Opcode; 52 FAST486_OPCODE_HANDLER_PROC CurrentHandler; 53 INT ProcedureCallCount = 0; 54 BOOLEAN Trap; 55 56 /* Main execution loop */ 57 do 58 { 59 Trap = State->Flags.Tf; 60 61 if (!State->Halted) 62 { 63 NextInst: 64 /* Check if this is a new instruction */ 65 if (State->PrefixFlags == 0) 66 { 67 State->SavedInstPtr = State->InstPtr; 68 State->SavedStackPtr = State->GeneralRegs[FAST486_REG_ESP]; 69 } 70 71 /* Perform an instruction fetch */ 72 if (!Fast486FetchByte(State, &Opcode)) 73 { 74 /* Exception occurred */ 75 State->PrefixFlags = 0; 76 continue; 77 } 78 79 // TODO: Check for CALL/RET to update ProcedureCallCount. 80 81 /* Call the opcode handler */ 82 CurrentHandler = Fast486OpcodeHandlers[Opcode]; 83 CurrentHandler(State, Opcode); 84 85 /* If this is a prefix, go to the next instruction immediately */ 86 if (CurrentHandler == Fast486OpcodePrefix) goto NextInst; 87 88 /* A non-prefix opcode has been executed, reset the prefix flags */ 89 State->PrefixFlags = 0; 90 } 91 92 /* 93 * Check if there is an interrupt to execute, or a hardware interrupt signal 94 * while interrupts are enabled. 95 */ 96 if (State->DoNotInterrupt) 97 { 98 /* Clear the interrupt delay flag */ 99 State->DoNotInterrupt = FALSE; 100 } 101 else if (Trap && !State->Halted) 102 { 103 /* Perform the interrupt */ 104 Fast486PerformInterrupt(State, FAST486_EXCEPTION_DB); 105 } 106 else if (State->Flags.If && State->IntSignaled) 107 { 108 /* No longer halted */ 109 State->Halted = FALSE; 110 111 /* Acknowledge the interrupt and perform it */ 112 Fast486PerformInterrupt(State, State->IntAckCallback(State)); 113 114 /* Clear the interrupt status */ 115 State->IntSignaled = FALSE; 116 } 117 } 118 while ((Command == FAST486_CONTINUE) || 119 (Command == FAST486_STEP_OVER && ProcedureCallCount > 0) || 120 (Command == FAST486_STEP_OUT && ProcedureCallCount >= 0)); 121 } 122 123 /* PUBLIC FUNCTIONS ***********************************************************/ 124 125 VOID 126 NTAPI 127 Fast486DumpState(PFAST486_STATE State) 128 { 129 DbgPrint("\nFast486DumpState -->\n"); 130 DbgPrint("\nCPU currently executing in %s mode at %04X:%08X\n", 131 (State->ControlRegisters[FAST486_REG_CR0] & FAST486_CR0_PE) ? "protected" : "real", 132 State->SegmentRegs[FAST486_REG_CS].Selector, 133 State->InstPtr.Long); 134 DbgPrint("\nGeneral purpose registers:\n" 135 "EAX = %08X\tECX = %08X\tEDX = %08X\tEBX = %08X\n" 136 "ESP = %08X\tEBP = %08X\tESI = %08X\tEDI = %08X\n", 137 State->GeneralRegs[FAST486_REG_EAX].Long, 138 State->GeneralRegs[FAST486_REG_ECX].Long, 139 State->GeneralRegs[FAST486_REG_EDX].Long, 140 State->GeneralRegs[FAST486_REG_EBX].Long, 141 State->GeneralRegs[FAST486_REG_ESP].Long, 142 State->GeneralRegs[FAST486_REG_EBP].Long, 143 State->GeneralRegs[FAST486_REG_ESI].Long, 144 State->GeneralRegs[FAST486_REG_EDI].Long); 145 DbgPrint("\nSegment registers:\n" 146 "ES = %04X (Base: %08X, Limit: %08X, Dpl: %u)\n" 147 "CS = %04X (Base: %08X, Limit: %08X, Dpl: %u)\n" 148 "SS = %04X (Base: %08X, Limit: %08X, Dpl: %u)\n" 149 "DS = %04X (Base: %08X, Limit: %08X, Dpl: %u)\n" 150 "FS = %04X (Base: %08X, Limit: %08X, Dpl: %u)\n" 151 "GS = %04X (Base: %08X, Limit: %08X, Dpl: %u)\n", 152 State->SegmentRegs[FAST486_REG_ES].Selector, 153 State->SegmentRegs[FAST486_REG_ES].Base, 154 State->SegmentRegs[FAST486_REG_ES].Limit, 155 State->SegmentRegs[FAST486_REG_ES].Dpl, 156 State->SegmentRegs[FAST486_REG_CS].Selector, 157 State->SegmentRegs[FAST486_REG_CS].Base, 158 State->SegmentRegs[FAST486_REG_CS].Limit, 159 State->SegmentRegs[FAST486_REG_CS].Dpl, 160 State->SegmentRegs[FAST486_REG_SS].Selector, 161 State->SegmentRegs[FAST486_REG_SS].Base, 162 State->SegmentRegs[FAST486_REG_SS].Limit, 163 State->SegmentRegs[FAST486_REG_SS].Dpl, 164 State->SegmentRegs[FAST486_REG_DS].Selector, 165 State->SegmentRegs[FAST486_REG_DS].Base, 166 State->SegmentRegs[FAST486_REG_DS].Limit, 167 State->SegmentRegs[FAST486_REG_DS].Dpl, 168 State->SegmentRegs[FAST486_REG_FS].Selector, 169 State->SegmentRegs[FAST486_REG_FS].Base, 170 State->SegmentRegs[FAST486_REG_FS].Limit, 171 State->SegmentRegs[FAST486_REG_FS].Dpl, 172 State->SegmentRegs[FAST486_REG_GS].Selector, 173 State->SegmentRegs[FAST486_REG_GS].Base, 174 State->SegmentRegs[FAST486_REG_GS].Limit, 175 State->SegmentRegs[FAST486_REG_GS].Dpl); 176 DbgPrint("\nFlags: %08X (%s %s %s %s %s %s %s %s %s %s %s %s %s) Iopl: %u\n", 177 State->Flags.Long, 178 State->Flags.Cf ? "CF" : "cf", 179 State->Flags.Pf ? "PF" : "pf", 180 State->Flags.Af ? "AF" : "af", 181 State->Flags.Zf ? "ZF" : "zf", 182 State->Flags.Sf ? "SF" : "sf", 183 State->Flags.Tf ? "TF" : "tf", 184 State->Flags.If ? "IF" : "if", 185 State->Flags.Df ? "DF" : "df", 186 State->Flags.Of ? "OF" : "of", 187 State->Flags.Nt ? "NT" : "nt", 188 State->Flags.Rf ? "RF" : "rf", 189 State->Flags.Vm ? "VM" : "vm", 190 State->Flags.Ac ? "AC" : "ac", 191 State->Flags.Iopl); 192 DbgPrint("\nControl Registers:\n" 193 "CR0 = %08X\tCR2 = %08X\tCR3 = %08X\n", 194 State->ControlRegisters[FAST486_REG_CR0], 195 State->ControlRegisters[FAST486_REG_CR2], 196 State->ControlRegisters[FAST486_REG_CR3]); 197 DbgPrint("\nDebug Registers:\n" 198 "DR0 = %08X\tDR1 = %08X\tDR2 = %08X\n" 199 "DR3 = %08X\tDR4 = %08X\tDR5 = %08X\n", 200 State->DebugRegisters[FAST486_REG_DR0], 201 State->DebugRegisters[FAST486_REG_DR1], 202 State->DebugRegisters[FAST486_REG_DR2], 203 State->DebugRegisters[FAST486_REG_DR3], 204 State->DebugRegisters[FAST486_REG_DR4], 205 State->DebugRegisters[FAST486_REG_DR5]); 206 207 #ifndef FAST486_NO_FPU 208 DbgPrint("\nFPU Registers:\n" 209 "ST0 = %04X%016llX\tST1 = %04X%016llX\n" 210 "ST2 = %04X%016llX\tST3 = %04X%016llX\n" 211 "ST4 = %04X%016llX\tST5 = %04X%016llX\n" 212 "ST6 = %04X%016llX\tST7 = %04X%016llX\n" 213 "Status: %04X\tControl: %04X\tTag: %04X\n", 214 FPU_ST(0).Exponent | ((USHORT)FPU_ST(0).Sign << 15), 215 FPU_ST(0).Mantissa, 216 FPU_ST(1).Exponent | ((USHORT)FPU_ST(1).Sign << 15), 217 FPU_ST(1).Mantissa, 218 FPU_ST(2).Exponent | ((USHORT)FPU_ST(2).Sign << 15), 219 FPU_ST(2).Mantissa, 220 FPU_ST(3).Exponent | ((USHORT)FPU_ST(3).Sign << 15), 221 FPU_ST(3).Mantissa, 222 FPU_ST(4).Exponent | ((USHORT)FPU_ST(4).Sign << 15), 223 FPU_ST(4).Mantissa, 224 FPU_ST(5).Exponent | ((USHORT)FPU_ST(5).Sign << 15), 225 FPU_ST(5).Mantissa, 226 FPU_ST(6).Exponent | ((USHORT)FPU_ST(6).Sign << 15), 227 FPU_ST(6).Mantissa, 228 FPU_ST(7).Exponent | ((USHORT)FPU_ST(7).Sign << 15), 229 FPU_ST(7).Mantissa, 230 State->FpuStatus, 231 State->FpuControl, 232 State->FpuTag); 233 #endif 234 235 DbgPrint("\n<-- Fast486DumpState\n\n"); 236 } 237 238 VOID 239 NTAPI 240 Fast486Continue(PFAST486_STATE State) 241 { 242 /* Call the internal function */ 243 Fast486ExecutionControl(State, FAST486_CONTINUE); 244 } 245 246 VOID 247 NTAPI 248 Fast486StepInto(PFAST486_STATE State) 249 { 250 /* Call the internal function */ 251 Fast486ExecutionControl(State, FAST486_STEP_INTO); 252 } 253 254 VOID 255 NTAPI 256 Fast486StepOver(PFAST486_STATE State) 257 { 258 /* Call the internal function */ 259 Fast486ExecutionControl(State, FAST486_STEP_OVER); 260 } 261 262 VOID 263 NTAPI 264 Fast486StepOut(PFAST486_STATE State) 265 { 266 /* Call the internal function */ 267 Fast486ExecutionControl(State, FAST486_STEP_OUT); 268 } 269 270 /* EOF */ 271