/* INCLUDES *******************************************************************/
-// #define WIN32_NO_STATUS
-// #define _INC_WINDOWS
#include <windef.h>
// #define NDEBUG
do
{
/* Check if this is a new instruction */
- if (State->PrefixFlags == 0)
- {
- State->SavedInstPtr = State->InstPtr;
-
- /* Check if interrupts are enabled and there is an interrupt pending */
- if (State->Flags.If && State->HardwareInt)
- {
- FAST486_IDT_ENTRY IdtEntry;
-
- /* Get the interrupt vector */
- if (Fast486GetIntVector(State, State->PendingIntNum, &IdtEntry))
- {
- /* Perform the interrupt */
- Fast486InterruptInternal(State,
- IdtEntry.Selector,
- MAKELONG(IdtEntry.Offset, IdtEntry.OffsetHigh),
- IdtEntry.Type);
- }
-
- /* Clear the interrupt pending flag */
- State->HardwareInt = FALSE;
- }
- }
+ if (State->PrefixFlags == 0) State->SavedInstPtr = State->InstPtr;
/* Perform an instruction fetch */
- if (!Fast486FetchByte(State, &Opcode)) continue;
+ if (!Fast486FetchByte(State, &Opcode))
+ {
+ /* Exception occurred */
+ State->PrefixFlags = 0;
+ continue;
+ }
// TODO: Check for CALL/RET to update ProcedureCallCount.
Fast486Exception(State, FAST486_EXCEPTION_UD);
}
- if (Fast486OpcodeHandlers[Opcode] != Fast486OpcodePrefix)
- {
- /* A non-prefix opcode has been executed, reset the prefix flags */
- State->PrefixFlags = 0;
- }
- else
+ if (Fast486OpcodeHandlers[Opcode] == Fast486OpcodePrefix)
{
/* This is a prefix, go to the next instruction immediately */
continue;
}
+
+ /* A non-prefix opcode has been executed, reset the prefix flags */
+ State->PrefixFlags = 0;
+
+ /*
+ * Check if there is an interrupt to execute, or a hardware interrupt signal
+ * while interrupts are enabled.
+ */
+ if (State->IntStatus == FAST486_INT_EXECUTE)
+ {
+ FAST486_IDT_ENTRY IdtEntry;
+
+ /* Get the interrupt vector */
+ if (Fast486GetIntVector(State, State->PendingIntNum, &IdtEntry))
+ {
+ /* Perform the interrupt */
+ Fast486InterruptInternal(State,
+ IdtEntry.Selector,
+ MAKELONG(IdtEntry.Offset, IdtEntry.OffsetHigh),
+ IdtEntry.Type);
+
+ /* Restore the prefix flags, which would be set to OPSIZE for 32-bit real mode */
+ State->PrefixFlags = 0;
+ }
+
+ /* Clear the interrupt status */
+ State->IntStatus = FAST486_INT_NONE;
+ }
+ else if (State->Flags.If
+ && (State->IntAckCallback != NULL)
+ && (State->IntStatus == FAST486_INT_SIGNAL))
+ {
+ /* Acknowledge the interrupt to get the number */
+ State->PendingIntNum = State->IntAckCallback(State);
+
+ /* Set the interrupt status to execute on the next instruction */
+ State->IntStatus = FAST486_INT_EXECUTE;
+ }
}
while ((Command == FAST486_CONTINUE)
|| (Command == FAST486_STEP_OVER && ProcedureCallCount > 0)
|| (Fast486OpcodeHandlers[Opcode] == Fast486OpcodePrefix));
}
-/* PUBLIC FUNCTIONS ***********************************************************/
+/* DEFAULT CALLBACKS **********************************************************/
-VOID
+static VOID
NTAPI
-Fast486Continue(PFAST486_STATE State)
+Fast486MemReadCallback(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
{
- /* Call the internal function */
- Fast486ExecutionControl(State, FAST486_CONTINUE);
+ UNREFERENCED_PARAMETER(State);
+
+ RtlMoveMemory(Buffer, (PVOID)Address, Size);
}
-VOID
+static VOID
NTAPI
-Fast486StepInto(PFAST486_STATE State)
+Fast486MemWriteCallback(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
{
- /* Call the internal function */
- Fast486ExecutionControl(State, FAST486_STEP_INTO);
+ UNREFERENCED_PARAMETER(State);
+
+ RtlMoveMemory((PVOID)Address, Buffer, Size);
+}
+
+static VOID
+NTAPI
+Fast486IoReadCallback(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
+{
+ UNREFERENCED_PARAMETER(State);
+ UNREFERENCED_PARAMETER(Port);
+ UNREFERENCED_PARAMETER(Buffer);
+ UNREFERENCED_PARAMETER(DataCount);
+ UNREFERENCED_PARAMETER(DataSize);
+}
+
+static VOID
+NTAPI
+Fast486IoWriteCallback(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
+{
+ UNREFERENCED_PARAMETER(State);
+ UNREFERENCED_PARAMETER(Port);
+ UNREFERENCED_PARAMETER(Buffer);
+ UNREFERENCED_PARAMETER(DataCount);
+ UNREFERENCED_PARAMETER(DataSize);
}
+static VOID
+NTAPI
+Fast486IdleCallback(PFAST486_STATE State)
+{
+ UNREFERENCED_PARAMETER(State);
+}
+
+static VOID
+NTAPI
+Fast486BopCallback(PFAST486_STATE State, UCHAR BopCode)
+{
+ UNREFERENCED_PARAMETER(State);
+ UNREFERENCED_PARAMETER(BopCode);
+}
+
+static UCHAR
+NTAPI
+Fast486IntAckCallback(PFAST486_STATE State)
+{
+ UNREFERENCED_PARAMETER(State);
+
+ /* Return something... */
+ return 0;
+}
+
+/* PUBLIC FUNCTIONS ***********************************************************/
+
VOID
NTAPI
-Fast486StepOver(PFAST486_STATE State)
+Fast486Initialize(PFAST486_STATE State,
+ FAST486_MEM_READ_PROC MemReadCallback,
+ FAST486_MEM_WRITE_PROC MemWriteCallback,
+ FAST486_IO_READ_PROC IoReadCallback,
+ FAST486_IO_WRITE_PROC IoWriteCallback,
+ FAST486_IDLE_PROC IdleCallback,
+ FAST486_BOP_PROC BopCallback,
+ FAST486_INT_ACK_PROC IntAckCallback,
+ PULONG Tlb)
{
- /* Call the internal function */
- Fast486ExecutionControl(State, FAST486_STEP_OVER);
+ /* Set the callbacks (or use default ones if some are NULL) */
+ State->MemReadCallback = (MemReadCallback ? MemReadCallback : Fast486MemReadCallback );
+ State->MemWriteCallback = (MemWriteCallback ? MemWriteCallback : Fast486MemWriteCallback);
+ State->IoReadCallback = (IoReadCallback ? IoReadCallback : Fast486IoReadCallback );
+ State->IoWriteCallback = (IoWriteCallback ? IoWriteCallback : Fast486IoWriteCallback );
+ State->IdleCallback = (IdleCallback ? IdleCallback : Fast486IdleCallback );
+ State->BopCallback = (BopCallback ? BopCallback : Fast486BopCallback );
+ State->IntAckCallback = (IntAckCallback ? IntAckCallback : Fast486IntAckCallback );
+
+ /* Set the TLB (if given) */
+ State->Tlb = Tlb;
+
+ /* Reset the CPU */
+ Fast486Reset(State);
}
VOID
NTAPI
-Fast486StepOut(PFAST486_STATE State)
+Fast486Reset(PFAST486_STATE State)
{
- /* Call the internal function */
- Fast486ExecutionControl(State, FAST486_STEP_OUT);
+ FAST486_SEG_REGS i;
+
+ FAST486_MEM_READ_PROC MemReadCallback = State->MemReadCallback;
+ FAST486_MEM_WRITE_PROC MemWriteCallback = State->MemWriteCallback;
+ FAST486_IO_READ_PROC IoReadCallback = State->IoReadCallback;
+ FAST486_IO_WRITE_PROC IoWriteCallback = State->IoWriteCallback;
+ FAST486_IDLE_PROC IdleCallback = State->IdleCallback;
+ FAST486_BOP_PROC BopCallback = State->BopCallback;
+ FAST486_INT_ACK_PROC IntAckCallback = State->IntAckCallback;
+ PULONG Tlb = State->Tlb;
+
+ /* Clear the entire structure */
+ RtlZeroMemory(State, sizeof(*State));
+
+ /* Initialize the registers */
+ State->Flags.AlwaysSet = 1;
+ State->InstPtr.LowWord = 0xFFF0;
+
+ /* Set the CPL to 0 */
+ State->Cpl = 0;
+
+ /* Initialize segments */
+ for (i = 0; i < FAST486_NUM_SEG_REGS; i++)
+ {
+ State->SegmentRegs[i].Selector = 0;
+ State->SegmentRegs[i].Base = 0;
+ State->SegmentRegs[i].Limit = 0xFFFF;
+ State->SegmentRegs[i].Present = TRUE;
+ State->SegmentRegs[i].ReadWrite = TRUE;
+ State->SegmentRegs[i].Executable = FALSE;
+ State->SegmentRegs[i].DirConf = FALSE;
+ State->SegmentRegs[i].SystemType = 1; // Segment descriptor
+ State->SegmentRegs[i].Dpl = 0;
+ State->SegmentRegs[i].Size = FALSE; // 16-bit
+ }
+
+ /* Initialize the code segment */
+ State->SegmentRegs[FAST486_REG_CS].Executable = TRUE;
+ State->SegmentRegs[FAST486_REG_CS].Selector = 0xF000;
+ State->SegmentRegs[FAST486_REG_CS].Base = 0xFFFF0000;
+
+ /* Initialize the IDT */
+ State->Idtr.Size = 0x3FF;
+ State->Idtr.Address = 0;
+
+#ifndef FAST486_NO_FPU
+ /* Initialize CR0 */
+ State->ControlRegisters[FAST486_REG_CR0] |= FAST486_CR0_ET;
+#endif
+
+ /* Restore the callbacks and TLB */
+ State->MemReadCallback = MemReadCallback;
+ State->MemWriteCallback = MemWriteCallback;
+ State->IoReadCallback = IoReadCallback;
+ State->IoWriteCallback = IoWriteCallback;
+ State->IdleCallback = IdleCallback;
+ State->BopCallback = BopCallback;
+ State->IntAckCallback = IntAckCallback;
+ State->Tlb = Tlb;
}
VOID
State->SegmentRegs[FAST486_REG_GS].Base,
State->SegmentRegs[FAST486_REG_GS].Limit,
State->SegmentRegs[FAST486_REG_GS].Dpl);
- DPRINT1("\nFlags: %08X (%s %s %s %s %s %s %s %s %s %s %s %s %s %s %s) Iopl: %u\n",
+ DPRINT1("\nFlags: %08X (%s %s %s %s %s %s %s %s %s %s %s %s) Iopl: %u\n",
State->Flags.Long,
State->Flags.Cf ? "CF" : "cf",
State->Flags.Pf ? "PF" : "pf",
State->Flags.Nt ? "NT" : "nt",
State->Flags.Rf ? "RF" : "rf",
State->Flags.Vm ? "VM" : "vm",
- State->Flags.Ac ? "AC" : "ac",
- State->Flags.Vif ? "VIF" : "vif",
- State->Flags.Vip ? "VIP" : "vip",
State->Flags.Iopl);
DPRINT1("\nControl Registers:\n"
- "CR0 = %08X\tCR1 = %08X\tCR2 = %08X\tCR3 = %08X\n"
- "CR4 = %08X\tCR5 = %08X\tCR6 = %08X\tCR7 = %08X\n",
+ "CR0 = %08X\tCR2 = %08X\tCR3 = %08X\n",
State->ControlRegisters[FAST486_REG_CR0],
- State->ControlRegisters[FAST486_REG_CR1],
State->ControlRegisters[FAST486_REG_CR2],
- State->ControlRegisters[FAST486_REG_CR3],
- State->ControlRegisters[FAST486_REG_CR4],
- State->ControlRegisters[FAST486_REG_CR5],
- State->ControlRegisters[FAST486_REG_CR6],
- State->ControlRegisters[FAST486_REG_CR7]);
+ State->ControlRegisters[FAST486_REG_CR3]);
DPRINT1("\nDebug Registers:\n"
- "DR0 = %08X\tDR1 = %08X\tDR2 = %08X\tDR3 = %08X\n"
- "DR4 = %08X\tDR5 = %08X\tDR6 = %08X\tDR7 = %08X\n",
+ "DR0 = %08X\tDR1 = %08X\tDR2 = %08X\n"
+ "DR3 = %08X\tDR4 = %08X\tDR5 = %08X\n",
State->DebugRegisters[FAST486_REG_DR0],
State->DebugRegisters[FAST486_REG_DR1],
State->DebugRegisters[FAST486_REG_DR2],
State->DebugRegisters[FAST486_REG_DR3],
State->DebugRegisters[FAST486_REG_DR4],
- State->DebugRegisters[FAST486_REG_DR5],
- State->DebugRegisters[FAST486_REG_DR6],
- State->DebugRegisters[FAST486_REG_DR7]);
+ State->DebugRegisters[FAST486_REG_DR5]);
}
VOID
NTAPI
-Fast486Reset(PFAST486_STATE State)
+Fast486Continue(PFAST486_STATE State)
{
- INT i;
- FAST486_MEM_READ_PROC MemReadCallback = State->MemReadCallback;
- FAST486_MEM_WRITE_PROC MemWriteCallback = State->MemWriteCallback;
- FAST486_IO_READ_PROC IoReadCallback = State->IoReadCallback;
- FAST486_IO_WRITE_PROC IoWriteCallback = State->IoWriteCallback;
- FAST486_IDLE_PROC IdleCallback = State->IdleCallback;
- FAST486_BOP_PROC BopCallback = State->BopCallback;
-
- /* Clear the entire structure */
- RtlZeroMemory(State, sizeof(*State));
-
- /* Initialize the registers */
- State->Flags.AlwaysSet = 1;
- State->InstPtr.LowWord = 0xFFF0;
-
- /* Initialize segments */
- for (i = 0; i < FAST486_NUM_SEG_REGS; i++)
- {
- /* Set the selector, base and limit, other values don't apply in real mode */
- State->SegmentRegs[i].Selector = 0;
- State->SegmentRegs[i].Base = 0;
- State->SegmentRegs[i].Limit = 0xFFFF;
- }
-
- /* Initialize the code segment */
- State->SegmentRegs[FAST486_REG_CS].Selector = 0xF000;
- State->SegmentRegs[FAST486_REG_CS].Base = 0xFFFF0000;
+ /* Call the internal function */
+ Fast486ExecutionControl(State, FAST486_CONTINUE);
+}
- /* Initialize the IDT */
- State->Idtr.Size = 0x3FF;
- State->Idtr.Address = 0;
+VOID
+NTAPI
+Fast486StepInto(PFAST486_STATE State)
+{
+ /* Call the internal function */
+ Fast486ExecutionControl(State, FAST486_STEP_INTO);
+}
- /* Initialize CR0 */
- State->ControlRegisters[FAST486_REG_CR0] |= FAST486_CR0_ET;
+VOID
+NTAPI
+Fast486StepOver(PFAST486_STATE State)
+{
+ /* Call the internal function */
+ Fast486ExecutionControl(State, FAST486_STEP_OVER);
+}
- /* Restore the callbacks */
- State->MemReadCallback = MemReadCallback;
- State->MemWriteCallback = MemWriteCallback;
- State->IoReadCallback = IoReadCallback;
- State->IoWriteCallback = IoWriteCallback;
- State->IdleCallback = IdleCallback;
- State->BopCallback = BopCallback;
+VOID
+NTAPI
+Fast486StepOut(PFAST486_STATE State)
+{
+ /* Call the internal function */
+ Fast486ExecutionControl(State, FAST486_STEP_OUT);
}
VOID
NTAPI
Fast486Interrupt(PFAST486_STATE State, UCHAR Number)
{
- /* Set the hardware interrupt flag */
- State->HardwareInt = TRUE;
+ /* Set the interrupt status and the number */
+ State->IntStatus = FAST486_INT_EXECUTE;
State->PendingIntNum = Number;
}
+VOID
+NTAPI
+Fast486InterruptSignal(PFAST486_STATE State)
+{
+ /* Set the interrupt status */
+ State->IntStatus = FAST486_INT_SIGNAL;
+}
+
VOID
NTAPI
Fast486ExecuteAt(PFAST486_STATE State, USHORT Segment, ULONG Offset)
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