reactos/lib/fast486/debug.c

   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 */