bool IDkmRuntimeStepper.OwnsCurrentExecutionLocation(DkmRuntimeInstance runtimeInstance, DkmStepper stepper, DkmStepArbitrationReason reason)
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(runtimeInstance.Process);
// Can't handle steps without an address
if (stepper.StartingAddress == null)
{
return(false);
}
var instructionAddress = stepper.StartingAddress.CPUInstructionPart.InstructionPointer;
if (DebugHelpers.useNativeInterfaces)
{
if (processData.nativeModuleInstance != null)
{
if (instructionAddress >= processData.nativeModuleInstance.BaseAddress && instructionAddress < processData.nativeModuleInstance.BaseAddress + processData.nativeModuleInstance.Size)
{
return(processData.bytecode.ConvertNativeAddressToInstruction(instructionAddress) != 0);
}
}
}
else
{
if (processData.moduleInstance != null)
{
if (instructionAddress >= processData.moduleInstance.BaseAddress && instructionAddress < processData.moduleInstance.BaseAddress + processData.moduleInstance.Size)
{
return(processData.bytecode.ConvertNativeAddressToInstruction(instructionAddress) != 0);
}
}
}
return(false);
}
void IDkmRuntimeMonitorBreakpointHandler.DisableRuntimeBreakpoint(DkmRuntimeBreakpoint runtimeBreakpoint)
{
var breakpointData = runtimeBreakpoint.GetDataItem <NullcBreakpointDataItem>();
if (breakpointData != null)
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(runtimeBreakpoint.Process);
var address = breakpointData.instructionAddress.CPUInstructionPart.InstructionPointer;
runtimeBreakpoint.Process.InvisibleWriteMemory(breakpointData.instructionAddress.CPUInstructionPart.InstructionPointer, breakpointData.prevValue);
// Skip internal breakpoints used in stepper
if (runtimeBreakpoint.SourceId != DebugHelpers.NullcStepperBreakpointSourceId)
{
if (processData.activeBreakpointLocations.Contains(address))
{
processData.activeBreakpointLocations.Remove(address);
}
// If we were planning to restore the breakpoint, forget about it
if (processData.lastHitBreakpointLocation == address)
{
processData.lastHitBreakpointLocation = 0;
}
}
}
}
void IDkmProcessExecutionNotification.OnProcessResume(DkmProcess process, DkmProcessExecutionCounters processCounters)
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(process);
// Third stage of breakpoint handling - schedule a single step so we will move from the instruction location where debug break instruction must be restored (int 3)
if (processData.lastHitBreakpointLocation != 0)
{
var singleStepRequest = DkmSingleStepRequest.Create(DebugHelpers.NullcStepperBreakpointSourceId, processData.singleStepThread);
singleStepRequest.EnableSingleStep();
}
}
void IDkmRuntimeMonitorBreakpointHandler.EnableRuntimeBreakpoint(DkmRuntimeBreakpoint runtimeBreakpoint)
{
var instructionBreakpoint = (runtimeBreakpoint as DkmRuntimeInstructionBreakpoint);
if (instructionBreakpoint != null)
{
var nativeInstructionAddress = instructionBreakpoint.InstructionAddress as DkmNativeInstructionAddress;
if (nativeInstructionAddress == null)
{
Debug.WriteLine("Missing breakpoint address");
return;
}
ulong address = instructionBreakpoint.InstructionAddress.CPUInstructionPart.InstructionPointer;
byte[] prevValue = new byte[1];
if (runtimeBreakpoint.Process.ReadMemory(address, DkmReadMemoryFlags.ExecutableOnly, prevValue) == 0)
{
Debug.WriteLine("Failed to read current instruction");
return;
}
var breakpointData = DebugHelpers.GetOrCreateDataItem <NullcBreakpointDataItem>(runtimeBreakpoint);
breakpointData.instructionAddress = nativeInstructionAddress;
breakpointData.prevValue = prevValue;
// Write an 'int 3' instruction
runtimeBreakpoint.Process.InvisibleWriteMemory(address, new byte[1] {
0xcc
});
// Remember locations of the active user breakpoint instructions, skip internal breakpoints used in stepper
if (runtimeBreakpoint.SourceId != DebugHelpers.NullcStepperBreakpointSourceId)
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(instructionBreakpoint.Process);
if (!processData.activeBreakpointLocations.Contains(address))
{
processData.activeBreakpointLocations.Add(address);
}
}
return;
}
Debug.WriteLine("Failed to enable the breakpoint");
}
bool IDkmModuleUserCodeDeterminer.IsUserCode(DkmModuleInstance moduleInstance)
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(moduleInstance.Process);
if (processData != null)
{
if (moduleInstance.LoadContext == "nullc embedded code")
{
return(true);
}
}
return(moduleInstance.IsUserCode());
}
void IDkmSingleStepCompleteReceived.OnSingleStepCompleteReceived(DkmSingleStepRequest singleStepRequest, DkmEventDescriptorS eventDescriptor)
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(singleStepRequest.Thread.Process);
// Last stage of breakpoint handling - restore debug break instruction now that we have moved from the breakpoint location
if (processData.lastHitBreakpointLocation != 0)
{
// Restore breakpoint instruction
singleStepRequest.Thread.Process.InvisibleWriteMemory(processData.lastHitBreakpointLocation, new byte[1] {
0xcc
});
processData.lastHitBreakpointLocation = 0;
eventDescriptor.Suppress();
}
}
void IDkmDebugMonitorExceptionNotification.OnDebugMonitorException(DkmExceptionInformation exception, DkmWorkList workList, DkmEventDescriptorS eventDescriptor)
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(exception.Process);
if (exception.InstructionAddress == null)
{
return;
}
ulong address = exception.InstructionAddress.CPUInstructionPart.InstructionPointer;
// Breakpoint
if (exception.Code == 0x80000003)
{
// Internal stepper breakpoints are silenced but te debugger is notified to break the process
if (processData.stepBreakpoint != null && processData.stepBreakpoint.InstructionAddress.CPUInstructionPart.InstructionPointer == address)
{
eventDescriptor.Suppress();
exception.Thread.OnEmbeddedBreakpointHit(exception.InstructionAddress, false);
}
if (processData.secondaryStepBreakpoint != null && processData.secondaryStepBreakpoint.InstructionAddress.CPUInstructionPart.InstructionPointer == address)
{
eventDescriptor.Suppress();
exception.Thread.OnEmbeddedBreakpointHit(exception.InstructionAddress, false);
}
// Second stage of breakpoint handling - supress exception, notify debugger to break the process and remember what breakpoint has to be resotred later
if (processData.activeBreakpointLocations.Contains(address))
{
eventDescriptor.Suppress();
exception.Thread.OnEmbeddedBreakpointHit(exception.InstructionAddress, false);
// Schedule restore of this breakpoint when process continues
processData.lastHitBreakpointLocation = address;
processData.singleStepThread = exception.Thread;
}
}
}
void IDkmInstructionAddressProvider.GetInstructionAddress(DkmProcess process, DkmWorkList workList, ulong instructionPointer, DkmCompletionRoutine <DkmGetInstructionAddressAsyncResult> completionRoutine)
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcModuleDataItem>(process);
if (!processData.nullcIsMissing && processData.moduleBase == 0)
{
processData.moduleBase = DebugHelpers.ReadPointerVariable(process, "nullcModuleStartAddress").GetValueOrDefault(0);
processData.moduleSize = (uint)(DebugHelpers.ReadPointerVariable(process, "nullcModuleEndAddress").GetValueOrDefault(0) - processData.moduleBase);
processData.nullcIsMissing = processData.moduleBase == 0;
}
if (processData.moduleBase != 0)
{
if (instructionPointer >= processData.moduleBase && instructionPointer < processData.moduleBase + processData.moduleSize)
{
DkmInstructionAddress address;
if (DebugHelpers.useNativeInterfaces)
{
var nullcNativeRuntime = DebugHelpers.useDefaultRuntimeInstance ? process.GetNativeRuntimeInstance() : process.GetRuntimeInstances().OfType <DkmNativeRuntimeInstance>().FirstOrDefault(el => el.Id.RuntimeType == DebugHelpers.NullcRuntimeGuid);
var nullcModuleInstance = nullcNativeRuntime.GetModuleInstances().OfType <DkmNativeModuleInstance>().FirstOrDefault(el => el.Module != null && el.Module.CompilerId.VendorId == DebugHelpers.NullcCompilerGuid);
address = DkmNativeInstructionAddress.Create(nullcNativeRuntime, nullcModuleInstance, (uint)(instructionPointer - processData.moduleBase), new DkmInstructionAddress.CPUInstruction(instructionPointer));
}
else
{
var nullcNativeRuntime = process.GetRuntimeInstances().OfType <DkmCustomRuntimeInstance>().FirstOrDefault(el => el.Id.RuntimeType == DebugHelpers.NullcRuntimeGuid);
var nullcModuleInstance = nullcNativeRuntime.GetModuleInstances().OfType <DkmCustomModuleInstance>().FirstOrDefault(el => el.Module != null && el.Module.CompilerId.VendorId == DebugHelpers.NullcCompilerGuid);
address = DkmCustomInstructionAddress.Create(nullcNativeRuntime, nullcModuleInstance, null, instructionPointer, null, new DkmInstructionAddress.CPUInstruction(instructionPointer));
}
completionRoutine(new DkmGetInstructionAddressAsyncResult(address, true));
return;
}
}
process.GetInstructionAddress(workList, instructionPointer, completionRoutine);
}
DkmStackWalkFrame[] IDkmCallStackFilter.FilterNextFrame(DkmStackContext stackContext, DkmStackWalkFrame input)
{
if (input == null) // null input frame indicates the end of the call stack. This sample does nothing on end-of-stack.
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcStackFilterDataItem>(stackContext.InspectionSession.Process);
processData.nullcFramePosition = 1;
return(null);
}
if (input.InstructionAddress == null)
{
return(new DkmStackWalkFrame[1] {
input
});
}
if (input.InstructionAddress.ModuleInstance != null)
{
if (input.BasicSymbolInfo != null && input.BasicSymbolInfo.MethodName == "ExecutorRegVm::RunCode")
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcStackFilterDataItem>(input.Thread.Process);
InitNullcDebugFunctions(processData, input.RuntimeInstance);
if (processData.nullcIsMissing)
{
return(new DkmStackWalkFrame[1] {
input
});
}
string vmInstructionStr = ExecuteExpression("instruction - codeBase", stackContext, input, true);
string ptrValue = DebugHelpers.Is64Bit(input.Thread.Process) ? "longValue" : "intValue";
string vmDataOffsetStr = ExecuteExpression($"(unsigned long long)regFilePtr[1].{ptrValue} - (unsigned long long)rvm->dataStack.data", stackContext, input, true);
if (vmInstructionStr != null && vmDataOffsetStr != null)
{
ulong vmInstruction = ulong.Parse(vmInstructionStr);
string stackFrameDesc = ExecuteExpression($"((char*(*)(unsigned, unsigned)){processData.nullcDebugGetVmAddressLocation})({vmInstruction}, 0),sb", stackContext, input, false);
var nullcCustomRuntime = input.Thread.Process.GetRuntimeInstances().OfType <DkmCustomRuntimeInstance>().FirstOrDefault(el => el.Id.RuntimeType == DebugHelpers.NullcVmRuntimeGuid);
if (stackFrameDesc != null && nullcCustomRuntime != null)
{
var flags = input.Flags;
flags = flags & ~(DkmStackWalkFrameFlags.NonuserCode | DkmStackWalkFrameFlags.UserStatusNotDetermined);
flags = flags | DkmStackWalkFrameFlags.InlineOptimized;
DkmCustomModuleInstance nullcModuleInstance = nullcCustomRuntime.GetModuleInstances().OfType <DkmCustomModuleInstance>().FirstOrDefault(el => el.Module != null && el.Module.CompilerId.VendorId == DebugHelpers.NullcCompilerGuid);
if (nullcModuleInstance != null)
{
DkmInstructionAddress instructionAddress = DkmCustomInstructionAddress.Create(nullcCustomRuntime, nullcModuleInstance, null, vmInstruction, null, null);
var rawAnnotations = new List <DkmStackWalkFrameAnnotation>();
// Additional unique request id
rawAnnotations.Add(DkmStackWalkFrameAnnotation.Create(DebugHelpers.NullcCallStackDataBaseGuid, ulong.Parse(vmDataOffsetStr)));
var annotations = new ReadOnlyCollection <DkmStackWalkFrameAnnotation>(rawAnnotations);
DkmStackWalkFrame frame = DkmStackWalkFrame.Create(stackContext.Thread, instructionAddress, input.FrameBase, input.FrameSize, flags, stackFrameDesc, input.Registers, annotations, nullcModuleInstance, null, null);
return(new DkmStackWalkFrame[2] {
frame, input
});
}
}
}
}
return(new DkmStackWalkFrame[1] {
input
});
}
// Currently we want to provide info only for JiT frames
if (!input.Flags.HasFlag(DkmStackWalkFrameFlags.UserStatusNotDetermined))
{
return(new DkmStackWalkFrame[1] {
input
});
}
try
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcStackFilterDataItem>(input.Thread.Process);
InitNullcDebugFunctions(processData, input.RuntimeInstance);
if (processData.nullcIsMissing)
{
return new DkmStackWalkFrame[1] {
input
}
}
;
string stackFrameDesc = ExecuteExpression($"((char*(*)(void*, unsigned)){processData.nullcDebugGetNativeAddressLocation})((void*)0x{input.InstructionAddress.CPUInstructionPart.InstructionPointer:X}, 0),sb", stackContext, input, false);
if (stackFrameDesc != null)
{
var flags = input.Flags;
flags = flags & ~(DkmStackWalkFrameFlags.NonuserCode | DkmStackWalkFrameFlags.UserStatusNotDetermined);
if (stackFrameDesc == "[Transition to nullc]")
{
return(new DkmStackWalkFrame[1] {
DkmStackWalkFrame.Create(stackContext.Thread, input.InstructionAddress, input.FrameBase, input.FrameSize, flags, stackFrameDesc, input.Registers, input.Annotations)
});
}
DkmStackWalkFrame frame = null;
var nullcCustomRuntime = input.Thread.Process.GetRuntimeInstances().OfType <DkmCustomRuntimeInstance>().FirstOrDefault(el => el.Id.RuntimeType == DebugHelpers.NullcRuntimeGuid);
var nullcNativeRuntime = DebugHelpers.useDefaultRuntimeInstance ? input.Thread.Process.GetNativeRuntimeInstance() : input.Thread.Process.GetRuntimeInstances().OfType <DkmNativeRuntimeInstance>().FirstOrDefault(el => el.Id.RuntimeType == DebugHelpers.NullcRuntimeGuid);
if (DebugHelpers.useNativeInterfaces ? nullcNativeRuntime != null : nullcCustomRuntime != null)
{
DkmModuleInstance nullcModuleInstance;
if (DebugHelpers.useNativeInterfaces)
{
nullcModuleInstance = nullcNativeRuntime.GetModuleInstances().OfType <DkmNativeModuleInstance>().FirstOrDefault(el => el.Module != null && el.Module.CompilerId.VendorId == DebugHelpers.NullcCompilerGuid);
}
else
{
nullcModuleInstance = nullcCustomRuntime.GetModuleInstances().OfType <DkmCustomModuleInstance>().FirstOrDefault(el => el.Module != null && el.Module.CompilerId.VendorId == DebugHelpers.NullcCompilerGuid);
}
if (nullcModuleInstance != null)
{
// If the top of the call stack is a nullc frame, nullc call stack wont have an entry for it and we start from 0, otherwise we start from default value of 1
if (input.Flags.HasFlag(DkmStackWalkFrameFlags.TopFrame))
{
processData.nullcFramePosition = 0;
}
string stackFrameBase = ExecuteExpression($"((unsigned(*)(unsigned)){processData.nullcDebugGetReversedStackDataBase})({processData.nullcFramePosition})", stackContext, input, true);
processData.nullcFramePosition++;
if (int.TryParse(stackFrameBase, out int stackFrameBaseValue))
{
DkmInstructionAddress instructionAddress;
if (DebugHelpers.useNativeInterfaces)
{
var rva = (uint)(input.InstructionAddress.CPUInstructionPart.InstructionPointer - nullcModuleInstance.BaseAddress);
instructionAddress = DkmNativeInstructionAddress.Create(nullcNativeRuntime, nullcModuleInstance as DkmNativeModuleInstance, rva, input.InstructionAddress.CPUInstructionPart);
}
else
{
instructionAddress = DkmCustomInstructionAddress.Create(nullcCustomRuntime, nullcModuleInstance as DkmCustomModuleInstance, null, input.InstructionAddress.CPUInstructionPart.InstructionPointer, null, input.InstructionAddress.CPUInstructionPart);
}
var rawAnnotations = new List <DkmStackWalkFrameAnnotation>();
// Additional unique request id
rawAnnotations.Add(DkmStackWalkFrameAnnotation.Create(DebugHelpers.NullcCallStackDataBaseGuid, (ulong)(stackFrameBaseValue)));
var annotations = new ReadOnlyCollection <DkmStackWalkFrameAnnotation>(rawAnnotations);
frame = DkmStackWalkFrame.Create(stackContext.Thread, instructionAddress, input.FrameBase, input.FrameSize, flags, stackFrameDesc, input.Registers, annotations, nullcModuleInstance, null, null);
}
}
}
if (frame == null)
{
frame = DkmStackWalkFrame.Create(stackContext.Thread, input.InstructionAddress, input.FrameBase, input.FrameSize, flags, stackFrameDesc, input.Registers, input.Annotations);
}
return(new DkmStackWalkFrame[1] {
frame
});
}
}
catch (Exception ex)
{
Console.WriteLine("Failed to evaluate: " + ex.ToString());
}
return(new DkmStackWalkFrame[1] {
input
});
}
void IDkmProcessExecutionNotification.OnProcessPause(DkmProcess process, DkmProcessExecutionCounters processCounters)
{
try
{
ulong?moduleBaseOpt = DebugHelpers.ReadPointerVariable(process, "nullcModuleStartAddress");
// Check if nullc is available
if (moduleBaseOpt == null)
{
return;
}
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(process);
if (processData.language == null)
{
processData.compilerId = new DkmCompilerId(DebugHelpers.NullcCompilerGuid, DebugHelpers.NullcLanguageGuid);
processData.language = DkmLanguage.Create("nullc", processData.compilerId);
}
// Create VM runtime and module
if (processData.vmRuntimeInstance == null)
{
DkmRuntimeInstanceId runtimeId = new DkmRuntimeInstanceId(DebugHelpers.NullcVmRuntimeGuid, 0);
processData.vmRuntimeInstance = DkmCustomRuntimeInstance.Create(process, runtimeId, null);
}
if (processData.vmModule == null)
{
DkmModuleId moduleId = new DkmModuleId(Guid.NewGuid(), DebugHelpers.NullcSymbolProviderGuid);
processData.vmModule = DkmModule.Create(moduleId, "nullc.vm.code", processData.compilerId, process.Connection, null);
}
if (processData.vmModuleInstance == null)
{
DkmDynamicSymbolFileId symbolFileId = DkmDynamicSymbolFileId.Create(DebugHelpers.NullcSymbolProviderGuid);
processData.vmModuleInstance = DkmCustomModuleInstance.Create("nullc_vm", "nullc.vm.code", 0, processData.vmRuntimeInstance, null, symbolFileId, DkmModuleFlags.None, DkmModuleMemoryLayout.Unknown, 0, 1, 0, "nullc vm code", false, null, null, null);
processData.vmModuleInstance.SetModule(processData.vmModule, true); // Can use reload?
}
ulong moduleBase = moduleBaseOpt.GetValueOrDefault(0);
uint moduleSize = (uint)(DebugHelpers.ReadPointerVariable(process, "nullcModuleEndAddress").GetValueOrDefault(0) - moduleBase);
// Create JiT runtime and module
if (moduleBase != 0 && moduleSize != 0)
{
if (processData.runtimeInstance == null && processData.nativeRuntimeInstance == null)
{
DkmRuntimeInstanceId runtimeId = new DkmRuntimeInstanceId(DebugHelpers.NullcRuntimeGuid, 0);
if (DebugHelpers.useNativeInterfaces)
{
processData.nativeRuntimeInstance = DebugHelpers.useDefaultRuntimeInstance ? process.GetNativeRuntimeInstance() : DkmNativeRuntimeInstance.Create(process, runtimeId, DkmRuntimeCapabilities.None, process.GetNativeRuntimeInstance(), null);
}
else
{
processData.runtimeInstance = DkmCustomRuntimeInstance.Create(process, runtimeId, null);
}
}
if (processData.module == null)
{
DkmModuleId moduleId = new DkmModuleId(Guid.NewGuid(), DebugHelpers.NullcSymbolProviderGuid);
processData.module = DkmModule.Create(moduleId, "nullc.embedded.code", processData.compilerId, process.Connection, null);
}
if (processData.moduleInstance == null && processData.nativeModuleInstance == null)
{
DkmDynamicSymbolFileId symbolFileId = DkmDynamicSymbolFileId.Create(DebugHelpers.NullcSymbolProviderGuid);
if (DebugHelpers.useNativeInterfaces)
{
processData.nativeModuleInstance = DkmNativeModuleInstance.Create("nullc", "nullc.embedded.code", 0, null, symbolFileId, DkmModuleFlags.None, DkmModuleMemoryLayout.Unknown, 1, "nullc embedded code", processData.nativeRuntimeInstance, moduleBase, moduleSize, Microsoft.VisualStudio.Debugger.Clr.DkmClrHeaderStatus.NativeBinary, false, null, null, null);
processData.nativeModuleInstance.SetModule(processData.module, true); // Can use reload?
}
else
{
processData.moduleInstance = DkmCustomModuleInstance.Create("nullc", "nullc.embedded.code", 0, processData.runtimeInstance, null, symbolFileId, DkmModuleFlags.None, DkmModuleMemoryLayout.Unknown, moduleBase, 1, moduleSize, "nullc embedded code", false, null, null, null);
processData.moduleInstance.SetModule(processData.module, true); // Can use reload?
}
}
}
// Update bytecode
var moduleBytecodeVersion = DebugHelpers.ReadPointerVariable(process, "nullcModuleBytecodeVersion").GetValueOrDefault(0);
if (processData.moduleBytecodeLocation != 0 && moduleBytecodeVersion != processData.moduleBytecodeVersion)
{
processData.moduleBytecodeLocation = 0;
processData.moduleBytecodeSize = 0;
processData.moduleBytecodeRaw = null;
processData.bytecode = null;
}
if (processData.moduleBytecodeLocation == 0)
{
processData.moduleBytecodeLocation = DebugHelpers.ReadPointerVariable(process, "nullcModuleBytecodeLocation").GetValueOrDefault(0);
processData.moduleBytecodeSize = DebugHelpers.ReadPointerVariable(process, "nullcModuleBytecodeSize").GetValueOrDefault(0);
processData.moduleBytecodeVersion = moduleBytecodeVersion;
if (processData.moduleBytecodeLocation != 0)
{
processData.moduleBytecodeRaw = new byte[processData.moduleBytecodeSize];
process.ReadMemory(processData.moduleBytecodeLocation, DkmReadMemoryFlags.None, processData.moduleBytecodeRaw);
processData.bytecode = new NullcBytecode();
processData.bytecode.ReadFrom(processData.moduleBytecodeRaw, DebugHelpers.Is64Bit(process));
// Notify local component about bytecode update
var message = DkmCustomMessage.Create(process.Connection, process, DebugHelpers.NullcReloadSymbolsMessageGuid, 1, null, null);
message.SendHigher();
}
}
}
catch (Exception ex)
{
Console.WriteLine("OnProcessPause failed with: " + ex.ToString());
}
}
void IDkmRuntimeStepper.NotifyStepComplete(DkmRuntimeInstance runtimeInstance, DkmStepper stepper)
{
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(runtimeInstance.Process);
ClearStepBreakpoints(processData);
}
void IDkmRuntimeStepper.Step(DkmRuntimeInstance runtimeInstance, DkmStepper stepper, DkmStepArbitrationReason reason)
{
if (!(this as IDkmRuntimeStepper).OwnsCurrentExecutionLocation(runtimeInstance, stepper, reason))
{
runtimeInstance.Step(stepper, reason);
return;
}
var processData = DebugHelpers.GetOrCreateDataItem <NullcRemoteProcessDataItem>(runtimeInstance.Process);
if (stepper.StepKind == DkmStepKind.StepIntoSpecific)
{
throw new NotSupportedException();
}
if (stepper.StepKind == DkmStepKind.Over || stepper.StepKind == DkmStepKind.Into)
{
ClearStepBreakpoints(processData);
int nullcInstruction = processData.bytecode.ConvertNativeAddressToInstruction(stepper.StartingAddress.CPUInstructionPart.InstructionPointer);
int line = processData.bytecode.GetInstructionSourceLocationLine(nullcInstruction, out int moduleIndex);
// Instruction based stepping
int nextNullcInstruction = nullcInstruction;
int secondaryNullcInstruction = 0;
while (nextNullcInstruction < processData.bytecode.instructions.Count)
{
// Walk forward until an instruction with a different line is hit
if (processData.bytecode.GetInstructionSourceLocationLine(nextNullcInstruction, out _) != line)
{
break;
}
var nextInstruction = processData.bytecode.instructions[nextNullcInstruction];
// If there is a jump, place a breakpoint at the target (even if it's on the same line)
if (nextInstruction.code == NullcInstructionCode.rviJmp)
{
nextNullcInstruction = (int)nextInstruction.argument;
break;
}
// If there is a conditional jump, place two breakpoints - one after it and one at the target (even if either of them is on the same line)
if (nextInstruction.code == NullcInstructionCode.rviJmpz || nextInstruction.code == NullcInstructionCode.rviJmpnz)
{
secondaryNullcInstruction = nextNullcInstruction + 1;
nextNullcInstruction = (int)nextInstruction.argument;
break;
}
// If there is a return, I wish I could just fallback to parent runtime to handle it, may be required to place a breakpoint at the call site
if (nextInstruction.code == NullcInstructionCode.rviReturn)
{
ulong address = GetReturnAddress(stepper.Thread);
// Address must be within nullc module or we will have to cancel the step
if (address >= processData.nativeModuleInstance.BaseAddress && address < processData.nativeModuleInstance.BaseAddress + processData.nativeModuleInstance.Size)
{
processData.stepBreakpoint = PlaceBreakpointAtAddress(processData, stepper.Thread, address);
}
else
{
stepper.OnStepComplete(stepper.Thread, false);
}
return;
}
if (stepper.StepKind == DkmStepKind.Into)
{
if (nextInstruction.code == NullcInstructionCode.rviCall && stepper.StepKind == DkmStepKind.Into)
{
NullcFuncInfo function = processData.bytecode.functions[(int)nextInstruction.argument];
if (function.regVmAddress != ~0u)
{
secondaryNullcInstruction = nextNullcInstruction + 1;
nextNullcInstruction = (int)function.regVmAddress;
break;
}
else if (function.funcPtrWrap != 0 || function.funcPtrRaw != 0)
{
// TODO: Step into an external function
// I've tryied placing a breakpoint at the external call target but it's not getting handled correctly
// Maybe the solution is to single step the process until the stack frame changes
}
}
else if (nextInstruction.code == NullcInstructionCode.rviCallPtr)
{
// TODO: Step into a function pointer call
}
}
nextNullcInstruction++;
}
if (nextNullcInstruction != 0)
{
ulong instructionAddress = processData.bytecode.ConvertInstructionToNativeAddress(nextNullcInstruction);
processData.stepBreakpoint = PlaceBreakpointAtAddress(processData, stepper.Thread, instructionAddress);
}
if (secondaryNullcInstruction != 0)
{
ulong instructionAddress = processData.bytecode.ConvertInstructionToNativeAddress(secondaryNullcInstruction);
processData.secondaryStepBreakpoint = PlaceBreakpointAtAddress(processData, stepper.Thread, instructionAddress);
}
}
else if (stepper.StepKind == DkmStepKind.Out)
{
ulong address = GetReturnAddress(stepper.Thread);
processData.stepBreakpoint = PlaceBreakpointAtAddress(processData, stepper.Thread, address);
}
else
{
throw new NotImplementedException();
}
}
