GP-617: Fixing stepping. Fixes for object tree.

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/dbgeng/DebugClient.java

@@ -41,7 +41,7 @@ public interface DebugClient extends DebugClientReentrant {
 		STEP_INTO(true, ExecutionState.RUNNING, 5), //
 		BREAK(false, ExecutionState.STOPPED, 0), //
 		NO_DEBUGGEE(true, null, 1), // shouldWait is true to handle process creation
-		STEP_BRANCH(true, null, 6), //
+		STEP_BRANCH(true, ExecutionState.RUNNING, 6), //
 		IGNORE_EVENT(false, null, 11), //
 		RESTART_REQUESTED(true, null, 12), //
 		REVERSE_GO(true, null, 0xff), //

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/DbgManager.java

@@ -45,7 +45,9 @@ public interface DbgManager extends AutoCloseable, DbgBreakpointInsertions {
 		/** Equivalent to {@code stepi} in the CLI */
 		STEP_INSTRUCTION("step-instruction"),
 		/** Equivalent to {@code until} in the CLI */
-		UNTIL("until"),;
+		UNTIL("until"),
+		/** Equivalent to {@code ext} in the CLI */
+		EXTENDED("ext"),;
 
 		final String str;
 

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/DbgProcess.java

@@ -21,6 +21,7 @@ import java.util.concurrent.CompletableFuture;
 
 import agent.dbgeng.dbgeng.DebugProcessId;
 import agent.dbgeng.dbgeng.DebugThreadId;
+import agent.dbgeng.manager.DbgManager.ExecSuffix;
 import agent.dbgeng.manager.impl.DbgSectionImpl;
 import ghidra.dbg.attributes.TypedTargetObjectRef;
 import ghidra.dbg.target.TargetAttachable;
@@ -182,6 +183,32 @@ public interface DbgProcess extends DbgMemoryOperations {
 	 */
 	CompletableFuture<Void> cont();
 
+	/**
+	 * Step the process
+	 * 
+	 * Note that the command can complete before the process has finished stepping. The command
+	 * completes as soon as the process is running. A separate stop event is emitted when the step is
+	 * completed.
+	 * 
+	 * @param suffix specifies how far to step, or on what conditions stepping ends.
+	 * 
+	 * @return a future that completes once the process is running
+	 */
+	CompletableFuture<Void> step(ExecSuffix suffix);
+
+	/**
+	 * Step the process
+	 * 
+	 * Note that the command can complete before the process has finished stepping. The command
+	 * completes as soon as the process is running. A separate stop event is emitted when the step is
+	 * completed.
+	 * 
+	 * @param args specifies how far to step, or on what conditions stepping ends.
+	 * 
+	 * @return a future that completes once the process is running
+	 */
+	CompletableFuture<Void> step(Map<String, ?> args);
+
 	/**
 	 * Evaluate an expression
 	 * 

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/DbgThread.java

@@ -16,6 +16,7 @@
 package agent.dbgeng.manager;
 
 import java.util.List;
+import java.util.Map;
 import java.util.concurrent.CompletableFuture;
 
 import agent.dbgeng.dbgeng.DebugThreadId;
@@ -106,6 +107,19 @@ public interface DbgThread
 	 */
 	CompletableFuture<Void> step(ExecSuffix suffix);
 
+	/**
+	 * Step the thread
+	 * 
+	 * Note that the command can complete before the thread has finished stepping. The command
+	 * completes as soon as the thread is running. A separate stop event is emitted when the step is
+	 * completed.
+	 * 
+	 * @param args specifies how far to step, or on what conditions stepping ends.
+	 * 
+	 * @return a future that completes once the thread is running
+	 */
+	CompletableFuture<Void> step(Map<String, ?> args);
+
 	/**
 	 * Detach from the entire process
 	 * 

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/cmd/DbgProcessSelectCommand.java

@@ -20,6 +20,7 @@ import agent.dbgeng.manager.DbgProcess;
 import agent.dbgeng.manager.impl.DbgManagerImpl;
 
 public class DbgProcessSelectCommand extends AbstractDbgCommand<Void> {
+
 	private DbgProcess process;
 
 	/**

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/cmd/DbgReadRegistersCommand.java

@@ -55,7 +55,7 @@ public class DbgReadRegistersCommand extends AbstractDbgCommand<Map<DbgRegister,
 				}
 			}
 		}
-		so.setCurrentThreadId(previous);
+		//so.setCurrentThreadId(previous);
 		return result;
 	}
 

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/cmd/DbgStackListFramesCommand.java

@@ -63,6 +63,6 @@ public class DbgStackListFramesCommand extends AbstractDbgCommand<List<DbgStackF
 				tf.Params[3].longValue());
 			result.add(frame);
 		}
-		so.setCurrentThreadId(previous);
+		//so.setCurrentThreadId(previous);
 	}
 }

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/cmd/DbgStepCommand.java

@@ -15,25 +15,40 @@
  */
 package agent.dbgeng.manager.cmd;
 
-import agent.dbgeng.dbgeng.DebugClient.DebugStatus;
+import java.util.Map;
+
 import agent.dbgeng.dbgeng.DebugControl;
+import agent.dbgeng.dbgeng.DebugThreadId;
 import agent.dbgeng.manager.DbgEvent;
 import agent.dbgeng.manager.DbgManager.ExecSuffix;
 import agent.dbgeng.manager.DbgThread;
 import agent.dbgeng.manager.evt.*;
 import agent.dbgeng.manager.impl.DbgManagerImpl;
+import agent.dbgeng.manager.impl.DbgThreadImpl;
+import ghidra.util.Msg;
 
 /**
  * Implementation of {@link DbgThread#stepInstruction()}
  */
 public class DbgStepCommand extends AbstractDbgCommand<Void> {
-	protected final ExecSuffix suffix;
 
-	public DbgStepCommand(DbgManagerImpl manager, ExecSuffix suffix) {
+	private DebugThreadId id;
+	protected final ExecSuffix suffix;
+	private String lastCommand = "tct";
+
+	public DbgStepCommand(DbgManagerImpl manager, DebugThreadId id, ExecSuffix suffix) {
 		super(manager);
+		this.id = id;
 		this.suffix = suffix;
 	}
 
+	public DbgStepCommand(DbgManagerImpl manager, DebugThreadId id, Map<String, ?> args) {
+		super(manager);
+		this.id = id;
+		this.suffix = ExecSuffix.EXTENDED;
+		this.lastCommand = (String) args.get("Command");
+	}
+
 	@Override
 	public boolean handle(DbgEvent<?> evt, DbgPendingCommand<?> pending) {
 		if (evt instanceof AbstractDbgCompletedCommandEvent && pending.getCommand().equals(this)) {
@@ -48,17 +63,53 @@ public class DbgStepCommand extends AbstractDbgCommand<Void> {
 		return false;
 	}
 
+	// NB:  Would really prefer to do this through the API, but the API does
+	//  not appear to support freeze/unfreeze and suspend/resume thread.  These appear
+	//  to be applied via the kernel32 API.  Worse, the Windbg/KD API appears to lack
+	//  commands to query the freeze/suspend count for a given thread.  Rather than 
+	//  wrestle with the underlying API, we're going to just use the WIndbg commands.
+	//  Note that the thread-restricted form is used iff we're stepping a thread other
+	//  then the event thread.
 	@Override
 	public void invoke() {
+		String cmd = "";
+		String prefix = id == null ? "" : "~" + id.id + " ";
 		DebugControl control = manager.getControl();
 		if (suffix.equals(ExecSuffix.STEP_INSTRUCTION)) {
-			control.setExecutionStatus(DebugStatus.STEP_INTO);
+			cmd = "t";
+			//control.setExecutionStatus(DebugStatus.STEP_INTO);
 		}
 		else if (suffix.equals(ExecSuffix.NEXT_INSTRUCTION)) {
-			control.setExecutionStatus(DebugStatus.STEP_OVER);
+			cmd = "p";
+			//control.setExecutionStatus(DebugStatus.STEP_OVER);
 		}
 		else if (suffix.equals(ExecSuffix.FINISH)) {
-			control.setExecutionStatus(DebugStatus.STEP_BRANCH);
+			cmd = "gu";
+			//control.setExecutionStatus(DebugStatus.STEP_BRANCH);
+		}
+		else if (suffix.equals(ExecSuffix.EXTENDED)) {
+			cmd = getLastCommand();
+		}
+		DbgThreadImpl eventThread = manager.getEventThread();
+		if (eventThread != null && eventThread.getId().equals(id)) {
+			control.execute(cmd);
+		}
+		else {
+			if (manager.isKernelMode()) {
+				Msg.info(this, "Thread-specific stepping ignored in kernel-mode");
+				control.execute(cmd);
+			}
+			else {
+				control.execute(prefix + cmd);
+			}
 		}
 	}
+
+	public String getLastCommand() {
+		return lastCommand;
+	}
+
+	public void setLastCommand(String lastCommand) {
+		this.lastCommand = lastCommand;
+	}
 }

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/cmd/DbgThreadHoldCommand.java

@@ -0,0 +1,73 @@
+/* ###
+ * IP: GHIDRA
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package agent.dbgeng.manager.cmd;
+
+import agent.dbgeng.dbgeng.DebugControl;
+import agent.dbgeng.dbgeng.DebugThreadId;
+import agent.dbgeng.manager.DbgThread;
+import agent.dbgeng.manager.impl.DbgManagerImpl;
+
+public class DbgThreadHoldCommand extends AbstractDbgCommand<Void> {
+
+	static final String FREEZE_ALL_THREADS_COMMAND = "~* f";
+	static final String FREEZE_CURRENT_THREAD_COMMAND = "~. f";
+	static final String UNFREEZE_CURRENT_THREAD_COMMAND = "~. u";
+	static final String UNFREEZE_ALL_THREADS_COMMAND = "~* u";
+
+	static final String SUSPEND_ALL_THREADS_COMMAND = "~* n";
+	static final String SUSPEND_CURRENT_THREAD_COMMAND = "~. n";
+	static final String RESUME_CURRENT_THREAD_COMMAND = "~. m";
+	static final String RESUME_ALL_THREADS_COMMAND = "~* m";
+
+	static final Boolean preferFreeze = true;
+
+	private DbgThread thread;
+	private Boolean set;
+
+	/**
+	 * Select the given thread and frame level
+	 * 
+	 * To simply select a thread, you should use frame 0 as the default.
+	 * 
+	 * @param manager the manager to execute the command
+	 * @param thread the desired thread
+	 * @param set hold or release
+	 */
+	public DbgThreadHoldCommand(DbgManagerImpl manager, DbgThread thread, Boolean set) {
+		super(manager);
+		this.thread = thread;
+		this.set = set;
+	}
+
+	@Override
+	public void invoke() {
+		DebugThreadId id = thread.getId();
+		if (id != null) {
+			manager.getSystemObjects().setCurrentThreadId(id);
+			if (!manager.isKernelMode()) {
+				DebugControl control = manager.getControl();
+				if (preferFreeze) {
+					control.execute(
+						set ? FREEZE_CURRENT_THREAD_COMMAND : UNFREEZE_CURRENT_THREAD_COMMAND);
+				}
+				else {
+					control.execute(
+						set ? SUSPEND_CURRENT_THREAD_COMMAND : RESUME_CURRENT_THREAD_COMMAND);
+				}
+			}
+		}
+	}
+}

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/cmd/DbgThreadSelectCommand.java

@@ -20,6 +20,7 @@ import agent.dbgeng.manager.DbgThread;
 import agent.dbgeng.manager.impl.DbgManagerImpl;
 
 public class DbgThreadSelectCommand extends AbstractDbgCommand<Void> {
+
 	private DbgThread thread;
 
 	/**

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/cmd/DbgWriteRegistersCommand.java

@@ -66,6 +66,6 @@ public class DbgWriteRegistersCommand extends AbstractDbgCommand<Void> {
 			}
 		}
 		registers.setValues(DebugRegisterSource.DEBUG_REGSRC_DEBUGGEE, values);
-		so.setCurrentThreadId(previous);
+		//so.setCurrentThreadId(previous);
 	}
 }

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/impl/DbgProcessImpl.java

@@ -28,6 +28,7 @@ import com.google.common.collect.RangeSet;
 import agent.dbgeng.dbgeng.*;
 import agent.dbgeng.dbgeng.DebugClient.DebugAttachFlags;
 import agent.dbgeng.manager.*;
+import agent.dbgeng.manager.DbgManager.ExecSuffix;
 import agent.dbgeng.manager.cmd.*;
 import ghidra.async.TypeSpec;
 import ghidra.comm.util.BitmaskSet;
@@ -304,6 +305,24 @@ public class DbgProcessImpl implements DbgProcess {
 		}).finish();
 	}
 
+	@Override
+	public CompletableFuture<Void> step(ExecSuffix suffix) {
+		return sequence(TypeSpec.VOID).then((seq) -> {
+			select().handle(seq::next);
+		}).then((seq) -> {
+			manager.execute(new DbgStepCommand(manager, null, suffix)).handle(seq::exit);
+		}).finish();
+	}
+
+	@Override
+	public CompletableFuture<Void> step(Map<String, ?> args) {
+		return sequence(TypeSpec.VOID).then((seq) -> {
+			select().handle(seq::next);
+		}).then((seq) -> {
+			manager.execute(new DbgStepCommand(manager, null, args)).handle(seq::exit);
+		}).finish();
+	}
+
 	protected <T> CompletableFuture<T> preferThread(
 			Function<DbgThreadImpl, CompletableFuture<T>> viaThread,
 			Supplier<CompletableFuture<T>> viaThis) {

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/manager/impl/DbgThreadImpl.java

@@ -220,7 +220,16 @@ public class DbgThreadImpl implements DbgThread {
 		return sequence(TypeSpec.VOID).then((seq) -> {
 			select().handle(seq::next);
 		}).then((seq) -> {
-			manager.execute(new DbgStepCommand(manager, suffix)).handle(seq::exit);
+			manager.execute(new DbgStepCommand(manager, id, suffix)).handle(seq::exit);
+		}).finish();
+	}
+
+	@Override
+	public CompletableFuture<Void> step(Map<String, ?> args) {
+		return sequence(TypeSpec.VOID).then((seq) -> {
+			select().handle(seq::next);
+		}).then((seq) -> {
+			manager.execute(new DbgStepCommand(manager, id, args)).handle(seq::exit);
 		}).finish();
 	}
 

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/model/iface1/DbgModelTargetSteppable.java

@@ -15,11 +15,12 @@
  */
 package agent.dbgeng.model.iface1;
 
+import java.util.Map;
 import java.util.concurrent.CompletableFuture;
 
 import agent.dbgeng.manager.DbgManager.ExecSuffix;
 import agent.dbgeng.manager.DbgThread;
-import agent.dbgeng.model.iface2.DbgModelTargetObject;
+import agent.dbgeng.model.iface2.*;
 import ghidra.dbg.target.TargetSteppable;
 
 /**
@@ -48,6 +49,8 @@ public interface DbgModelTargetSteppable<T extends TargetSteppable<T>>
 				return ExecSuffix.RETURN;
 			case UNTIL:
 				return ExecSuffix.UNTIL;
+			case EXTENDED:
+				return ExecSuffix.EXTENDED;
 			default:
 				throw new AssertionError();
 		}
@@ -62,7 +65,21 @@ public interface DbgModelTargetSteppable<T extends TargetSteppable<T>>
 			case ADVANCE: // Why no exec-advance in dbgeng?
 				return thread.console("advance");
 			default:
+				if (this instanceof DbgModelTargetThread) {
+					DbgModelTargetThread targetThread = (DbgModelTargetThread) this;
+					return targetThread.getThread().step(convertToDbg(kind));
+				}
+				if (this instanceof DbgModelTargetProcess) {
+					DbgModelTargetProcess targetProcess = (DbgModelTargetProcess) this;
+					return targetProcess.getProcess().step(convertToDbg(kind));
+				}
 				return thread.step(convertToDbg(kind));
 		}
 	}
+
+	default CompletableFuture<Void> step(Map<String, ?> args) {
+		DbgThread thread = getManager().getCurrentThread();
+		return thread.step(args);
+	}
+
 }

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/model/impl/DbgModelTargetProcessImpl.java

@@ -180,17 +180,21 @@ public class DbgModelTargetProcessImpl extends DbgModelTargetObjectImpl
 
 	@Override
 	public CompletableFuture<Void> step(TargetStepKind kind) {
-		DbgThread thread = getManager().getCurrentThread();
 		switch (kind) {
 			case SKIP:
 				throw new UnsupportedOperationException(kind.name());
 			case ADVANCE: // Why no exec-advance in dbgeng?
-				return thread.console("advance");
+				throw new UnsupportedOperationException(kind.name());
 			default:
-				return thread.step(convertToDbg(kind));
+				return process.step(convertToDbg(kind));
 		}
 	}
 
+	@Override
+	public CompletableFuture<Void> step(Map<String, ?> args) {
+		return process.step(args);
+	}
+
 	@Override
 	public void processStarted(Long pid) {
 		if (pid != null) {

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/model/impl/DbgModelTargetRootImpl.java

@@ -87,9 +87,24 @@ public class DbgModelTargetRootImpl extends DbgModelDefaultTargetModelRoot
 		boolean doFire;
 		synchronized (this) {
 			doFire = !Objects.equals(this.focus, sel);
-			this.focus = sel;
+			if (doFire && focus != null) {
+				List<String> focusPath = focus.getPath();
+				List<String> selPath = sel.getPath();
+				for (int i = 0; i < focusPath.size(); i++) {
+					if (i >= selPath.size()) {
+						doFire = false;
+						break;
+					}
+					if (!focusPath.get(i).equals(selPath.get(i))) {
+						doFire = true;
+						break;
+					}
+				}
+				//doFire = !focusPath.containsAll(selPath);
+			}
 		}
 		if (doFire) {
+			this.focus = sel;
 			changeAttributes(List.of(), List.of(), Map.of( //
 				TargetFocusScope.FOCUS_ATTRIBUTE_NAME, focus //
 			), "Focus changed");

Ghidra/Debug/Debugger-agent-dbgeng/src/main/java/agent/dbgeng/model/impl/DbgModelTargetThreadImpl.java

@@ -22,7 +22,6 @@ import java.util.concurrent.atomic.AtomicReference;
 
 import agent.dbgeng.dbgeng.DebugThreadId;
 import agent.dbgeng.manager.*;
-import agent.dbgeng.manager.DbgManager.ExecSuffix;
 import agent.dbgeng.manager.cmd.DbgThreadSelectCommand;
 import agent.dbgeng.manager.impl.DbgManagerImpl;
 import agent.dbgeng.model.iface1.DbgModelTargetFocusScope;
@@ -46,8 +45,14 @@ public class DbgModelTargetThreadImpl extends DbgModelTargetObjectImpl
 		implements DbgModelTargetThread {
 
 	protected static final TargetStepKindSet SUPPORTED_KINDS = TargetStepKindSet.of( //
-		TargetStepKind.ADVANCE, TargetStepKind.FINISH, TargetStepKind.LINE, TargetStepKind.OVER,
-		TargetStepKind.OVER_LINE, TargetStepKind.RETURN, TargetStepKind.UNTIL);
+		TargetStepKind.ADVANCE, //
+		TargetStepKind.FINISH, //
+		TargetStepKind.LINE, //
+		TargetStepKind.OVER, //
+		TargetStepKind.OVER_LINE, //
+		TargetStepKind.RETURN, //
+		TargetStepKind.UNTIL, //
+		TargetStepKind.EXTENDED);
 
 	protected static String indexThread(DebugThreadId debugThreadId) {
 		return PathUtils.makeIndex(debugThreadId.id);
@@ -117,33 +122,12 @@ public class DbgModelTargetThreadImpl extends DbgModelTargetObjectImpl
 		TargetExecutionState targetState = convertState(state);
 		String executionType = thread.getExecutingProcessorType().description;
 		changeAttributes(List.of(), List.of(), Map.of( //
+			STATE_ATTRIBUTE_NAME, targetState, //
 			TargetEnvironment.ARCH_ATTRIBUTE_NAME, executionType //
 		), reason.desc());
 		setExecutionState(targetState, reason.desc());
 	}
 
-	@Override
-	public ExecSuffix convertToDbg(TargetStepKind kind) {
-		switch (kind) {
-			case FINISH:
-				return ExecSuffix.FINISH;
-			case INTO:
-				return ExecSuffix.STEP_INSTRUCTION;
-			case LINE:
-				return ExecSuffix.STEP;
-			case OVER:
-				return ExecSuffix.NEXT_INSTRUCTION;
-			case OVER_LINE:
-				return ExecSuffix.NEXT;
-			case RETURN:
-				return ExecSuffix.RETURN;
-			case UNTIL:
-				return ExecSuffix.UNTIL;
-			default:
-				throw new AssertionError();
-		}
-	}
-
 	@Override
 	public CompletableFuture<Void> step(TargetStepKind kind) {
 		switch (kind) {
@@ -156,6 +140,11 @@ public class DbgModelTargetThreadImpl extends DbgModelTargetObjectImpl
 		}
 	}
 
+	@Override
+	public CompletableFuture<Void> step(Map<String, ?> args) {
+		return thread.step(args);
+	}
+
 	@Override
 	public CompletableFuture<Void> select() {
 		DbgManagerImpl manager = getManager();

Ghidra/Debug/Debugger-agent-dbgmodel/src/main/java/agent/dbgmodel/model/impl/DbgModel2TargetRootImpl.java

@@ -96,9 +96,24 @@ public class DbgModel2TargetRootImpl extends DbgModel2DefaultTargetModelRoot
 		boolean doFire;
 		synchronized (this) {
 			doFire = !Objects.equals(this.focus, sel);
-			this.focus = sel;
+			if (doFire && focus != null) {
+				List<String> focusPath = focus.getPath();
+				List<String> selPath = sel.getPath();
+				for (int i = 0; i < focusPath.size(); i++) {
+					if (i >= selPath.size()) {
+						doFire = false;
+						break;
+					}
+					if (!focusPath.get(i).equals(selPath.get(i))) {
+						doFire = true;
+						break;
+					}
+				}
+				//doFire = !focusPath.containsAll(selPath);
+			}
 		}
 		if (doFire) {
+			this.focus = sel;
 			changeAttributes(List.of(), List.of(), Map.of( //
 				TargetFocusScope.FOCUS_ATTRIBUTE_NAME, focus //
 			), "Focus changed");

Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/manager/GdbManager.java

@@ -55,7 +55,8 @@ public interface GdbManager extends AutoCloseable, GdbBreakpointInsertions {
 		STEP_INSTRUCTION("step-instruction"),
 		/** Equivalent to {@code until} in the CLI */
 		UNTIL("until"),
-		;
+		/** User-defined */
+		EXTENDED("until"),;
 
 		final String str;
 
@@ -332,8 +333,12 @@ public interface GdbManager extends AutoCloseable, GdbBreakpointInsertions {
 	 * 
 	 * <p>
 	 * This waits for a prompt from GDB unless the last line printed is already a prompt. This is
-	 * generally not necessary following normal commands, but may be necessary after interrupting a
-	 * running inferior, or after waiting for an inferior to reach a stopped state.
+	 * generally not necessary following normal commands. Note that depending on circumstances and
+	 * GDB version, the MI console may produce a prompt before it produces all of the events
+	 * associated with an interrupt. If the <em>last</em> line is not currently a prompt, then the
+	 * returned future will not be complete. In other words, this is not a reliable way of verifying
+	 * GDB is waiting for a command. It's primary use is confirming that GDB has started
+	 * successfully and is awaiting its first command.
 	 * 
 	 * @return a future which completes when GDB presents a prompt
 	 */
@@ -393,7 +398,10 @@ public interface GdbManager extends AutoCloseable, GdbBreakpointInsertions {
 	 * <p>
 	 * The output will not be printed to the CLI console. To ensure a certain thread or inferior has
 	 * focus for a console command, see {@link GdbThread#consoleCapture(String)} and
-	 * {@link GdbInferior#consoleCapture(String)}.
+	 * {@link GdbInferior#consoleCapture(String)}. The caller should take care that other commands
+	 * or events are not actively producing console output. If they are, those lines may be captured
+	 * though they are unrelated to the given command. Generally, this can be achieved by assuring
+	 * that GDB is in the {@link GdbState#STOPPED} state using {@link #waitForState(GdbState)}.
 	 * 
 	 * @param command the command to execute
 	 * @return a future that completes with the captured output when GDB has executed the command
@@ -404,14 +412,14 @@ public interface GdbManager extends AutoCloseable, GdbBreakpointInsertions {
 	 * Interrupt the GDB session
 	 * 
 	 * <p>
-	 * This is equivalent to typing Ctrl-C in the CLI. This typically results in the target being
-	 * interrupted, either because GDB and the target have the same controlling TTY, or because GDB
-	 * will "forward" the interrupt to the target.
-	 * 
-	 * <p>
-	 * For whatever reason, interrupting the session does not always reliably interrupt the target.
-	 * The manager will send Ctrl-C to the pseudo-terminal up to three times, waiting about 10ms
-	 * between each, until GDB issues a stopped event and presents a new prompt.
+	 * The manager may employ a variety of mechanisms depending on the current configuration. If
+	 * multiple interpreters are available, it will issue an "interrupt" command on whichever
+	 * interpreter it believes is responsive -- usually the opposite of the one issuing the last
+	 * run, continue, step, etc. command. Otherwise, it sends Ctrl-C to GDB's TTY, which
+	 * unfortunately is notoriously unreliable. The manager will send Ctrl-C to the TTY up to three
+	 * times, waiting about 10ms between each, until GDB issues a stopped event and presents a new
+	 * prompt. If that fails, it is up to the user to find an alternative means to interrupt the
+	 * target, e.g., issuing {@code kill [pid]} from the a terminal on the target's host.
 	 * 
 	 * @return a future that completes when GDB has entered the stopped state
 	 */

Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/manager/impl/cmd/GdbContinueCommand.java

@@ -19,7 +19,6 @@ import agent.gdb.manager.GdbInferior;
 import agent.gdb.manager.evt.*;
 import agent.gdb.manager.impl.*;
 import agent.gdb.manager.impl.GdbManagerImpl.Interpreter;
-import ghidra.util.Msg;
 
 /**
  * Implementation of {@link GdbInferior#cont()}
@@ -29,56 +28,6 @@ public class GdbContinueCommand extends AbstractGdbCommandWithThreadId<Void> {
 		super(manager, threadId);
 	}
 
-	@Override
-	public String encode(String threadPart) {
-		switch (getInterpreter()) {
-			case CLI:
-				return "continue";
-			case MI2:
-				return "-exec-continue" + threadPart;
-			default:
-				throw new AssertionError();
-		}
-	}
-
-	@Override
-	public boolean handle(GdbEvent<?> evt, GdbPendingCommand<?> pending) {
-		if (evt instanceof AbstractGdbCompletedCommandEvent) {
-			if (!pending.hasAny(AbstractGdbCompletedCommandEvent.class)) {
-				pending.claim(evt);
-			}
-			return evt instanceof GdbCommandErrorEvent || pending.hasAny(GdbRunningEvent.class);
-		}
-		else if (evt instanceof GdbRunningEvent) {
-			// Event happens no matter which interpreter received the command
-			pending.claim(evt);
-			return pending.hasAny(AbstractGdbCompletedCommandEvent.class);
-		}
-		else if (evt instanceof GdbConsoleOutputEvent) {
-			Msg.debug(this, "EXAMINING: " + evt);
-			if (pending.hasAny(GdbCommandRunningEvent.class)) {
-				// Only attempt to process/claim the first line after our command
-				return false;
-			}
-			GdbConsoleOutputEvent out = (GdbConsoleOutputEvent) evt;
-			if (out.getOutput().trim().equals("continue")) {
-				// Echoed back my command
-				return false;
-			}
-			pending.claim(evt);
-			if (out.getOutput().trim().startsWith("Continuing") &&
-				!pending.hasAny(GdbCommandRunningEvent.class)) {
-				pending.claim(new GdbCommandRunningEvent());
-				return pending.hasAny(GdbRunningEvent.class);
-			}
-			else {
-				pending.claim(GdbCommandErrorEvent.fromMessage(out.getOutput()));
-				return true;
-			}
-		}
-		return false;
-	}
-
 	@Override
 	public Interpreter getInterpreter() {
 		if (manager.hasCli()) {
@@ -87,6 +36,38 @@ public class GdbContinueCommand extends AbstractGdbCommandWithThreadId<Void> {
 		return Interpreter.MI2;
 	}
 
+	@Override
+	public String encode(String threadPart) {
+		switch (getInterpreter()) {
+			case CLI:
+				// The significance is the Pty, not so much the actual command
+				// Using MI2 simplifies event processing (no console output parsing)
+				return "interpreter-exec mi2 \"-exec-continue" + threadPart + "\"";
+			case MI2:
+				return "-exec-continue" + threadPart;
+			default:
+				throw new AssertionError();
+		}
+	}
+
+	@Override
+	public boolean handle(GdbEvent<?> evt, GdbPendingCommand<?> pending) {
+		if (evt instanceof GdbCommandRunningEvent) {
+			pending.claim(evt);
+			return pending.hasAny(GdbRunningEvent.class);
+		}
+		else if (evt instanceof AbstractGdbCompletedCommandEvent) {
+			pending.claim(evt);
+			return true; // Not the expected Completed event 
+		}
+		else if (evt instanceof GdbRunningEvent) {
+			// Event happens no matter which interpreter received the command
+			pending.claim(evt);
+			return pending.hasAny(GdbCommandRunningEvent.class);
+		}
+		return false;
+	}
+
 	@Override
 	public Void complete(GdbPendingCommand<?> pending) {
 		pending.checkCompletion(GdbCommandRunningEvent.class);

Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/manager/impl/cmd/GdbGetThreadInfoCommand.java

@@ -33,7 +33,7 @@ public class GdbGetThreadInfoCommand extends AbstractGdbCommandWithThreadId<GdbT
 
 	@Override
 	protected String encode(String threadPart) {
-		return "-thread-info" + threadPart;
+		return "-thread-info " + threadId; // Note the trailing space
 	}
 
 	@Override

Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/manager/impl/cmd/GdbInterruptCommand.java

@@ -67,7 +67,8 @@ public class GdbInterruptCommand extends AbstractGdbCommand<Void> {
 
 	@Override
 	public Void complete(GdbPendingCommand<?> pending) {
-		pending.findSingleOf(GdbStoppedEvent.class);
+		// When using -exec-interrupt, ^done will come before *stopped
+		//pending.findSingleOf(GdbStoppedEvent.class);
 		return null;
 	}
 

Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/manager/impl/cmd/GdbRunCommand.java

@@ -19,6 +19,7 @@ import agent.gdb.manager.GdbInferior;
 import agent.gdb.manager.GdbThread;
 import agent.gdb.manager.evt.*;
 import agent.gdb.manager.impl.*;
+import agent.gdb.manager.impl.GdbManagerImpl.Interpreter;
 
 /**
  * Implementation of {@link GdbInferior#run()}
@@ -29,9 +30,26 @@ public class GdbRunCommand extends AbstractGdbCommand<GdbThread> {
 		super(manager);
 	}
 
+	@Override
+	public Interpreter getInterpreter() {
+		if (manager.hasCli()) {
+			return Interpreter.CLI;
+		}
+		return Interpreter.MI2;
+	}
+
 	@Override
 	public String encode() {
-		return "-exec-run";
+		switch (getInterpreter()) {
+			case CLI:
+				// The significance is the Pty, not so much the actual command
+				// Using MI2 simplifies event processing (no console output parsing)
+				return "interpreter-exec mi2 \"-exec-run\"";
+			case MI2:
+				return "-exec-run";
+			default:
+				throw new AssertionError();
+		}
 	}
 
 	@Override
@@ -40,7 +58,7 @@ public class GdbRunCommand extends AbstractGdbCommand<GdbThread> {
 			pending.claim(evt);
 			return pending.hasAny(GdbRunningEvent.class);
 		}
-		if (evt instanceof AbstractGdbCompletedCommandEvent) {
+		else if (evt instanceof AbstractGdbCompletedCommandEvent) {
 			pending.claim(evt);
 			return true; // Not the expected Completed event
 		}

Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/manager/impl/cmd/GdbStepCommand.java

@@ -19,6 +19,7 @@ import agent.gdb.manager.GdbManager.ExecSuffix;
 import agent.gdb.manager.GdbThread;
 import agent.gdb.manager.evt.*;
 import agent.gdb.manager.impl.*;
+import agent.gdb.manager.impl.GdbManagerImpl.Interpreter;
 
 /**
  * Implementation of {@link GdbThread#stepInstruction()}
@@ -31,9 +32,27 @@ public class GdbStepCommand extends AbstractGdbCommandWithThreadId<Void> {
 		this.suffix = suffix;
 	}
 
+	@Override
+	public Interpreter getInterpreter() {
+		if (manager.hasCli()) {
+			return Interpreter.CLI;
+		}
+		return Interpreter.MI2;
+	}
+
 	@Override
 	protected String encode(String threadPart) {
-		return "-exec-" + suffix + threadPart;
+		String mi2Cmd = "-exec-" + suffix + threadPart;
+		switch (getInterpreter()) {
+			case CLI:
+				// The significance is the Pty, not so much the actual command
+				// Using MI2 simplifies event processing (no console output parsing)
+				return "interpreter-exec mi2 \"" + mi2Cmd + "\"";
+			case MI2:
+				return mi2Cmd;
+			default:
+				throw new AssertionError();
+		}
 	}
 
 	@Override

Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/model/impl/GdbModelTargetInferior.java

@@ -33,11 +33,12 @@ import ghidra.dbg.util.PathUtils;
 import ghidra.lifecycle.Internal;
 import ghidra.util.Msg;
 
-@TargetObjectSchemaInfo(name = "Inferior", elements = {
-	@TargetElementType(type = Void.class)
-}, attributes = {
-	@TargetAttributeType(type = Void.class)
-})
+@TargetObjectSchemaInfo(
+	name = "Inferior",
+	elements = {
+		@TargetElementType(type = Void.class) },
+	attributes = {
+		@TargetAttributeType(type = Void.class) })
 public class GdbModelTargetInferior
 		extends DefaultTargetObject<TargetObject, GdbModelTargetInferiorContainer> implements //
 		TargetProcess<GdbModelTargetInferior>,  //
@@ -92,20 +93,19 @@ public class GdbModelTargetInferior
 		this.registers = new GdbModelTargetRegisterContainer(this);
 		this.threads = new GdbModelTargetThreadContainer(this);
 
-		changeAttributes(List.of(),
-			List.of(
-				environment,
-				memory,
-				modules,
-				registers,
-				threads),
-			Map.of(
-				STATE_ATTRIBUTE_NAME, TargetExecutionState.INACTIVE,
-				DISPLAY_ATTRIBUTE_NAME, updateDisplay(),
-				TargetMethod.PARAMETERS_ATTRIBUTE_NAME, TargetCmdLineLauncher.PARAMETERS,
-				UPDATE_MODE_ATTRIBUTE_NAME, TargetUpdateMode.FIXED,
-				SUPPORTED_ATTACH_KINDS_ATTRIBUTE_NAME, SUPPORTED_KINDS,
-				SUPPORTED_STEP_KINDS_ATTRIBUTE_NAME, GdbModelTargetThread.SUPPORTED_KINDS),
+		changeAttributes(List.of(), //
+			List.of( //
+				environment, //
+				memory, //
+				modules, //
+				registers, //
+				threads), //
+			Map.of(STATE_ATTRIBUTE_NAME, TargetExecutionState.INACTIVE, //
+				DISPLAY_ATTRIBUTE_NAME, updateDisplay(), //
+				TargetMethod.PARAMETERS_ATTRIBUTE_NAME, TargetCmdLineLauncher.PARAMETERS, //
+				UPDATE_MODE_ATTRIBUTE_NAME, TargetUpdateMode.FIXED, //
+				SUPPORTED_ATTACH_KINDS_ATTRIBUTE_NAME, SUPPORTED_KINDS, //
+				SUPPORTED_STEP_KINDS_ATTRIBUTE_NAME, GdbModelTargetThread.SUPPORTED_KINDS), //
 			"Initialized");
 	}
 
@@ -160,6 +160,8 @@ public class GdbModelTargetInferior
 				return ExecSuffix.RETURN;
 			case UNTIL:
 				return ExecSuffix.UNTIL;
+			case EXTENDED:
+				return ExecSuffix.EXTENDED;
 			default:
 				throw new AssertionError();
 		}

Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/model/impl/GdbModelTargetStackFrameRegister.java

@@ -26,11 +26,12 @@ import ghidra.dbg.target.schema.*;
 import ghidra.dbg.util.CollectionUtils.Delta;
 import ghidra.dbg.util.PathUtils;
 
-@TargetObjectSchemaInfo(name = "RegisterValue", elements = {
-	@TargetElementType(type = Void.class)
-}, attributes = {
-	@TargetAttributeType(type = Void.class)
-})
+@TargetObjectSchemaInfo(
+	name = "RegisterValue",
+	elements = {
+		@TargetElementType(type = Void.class) },
+	attributes = {
+		@TargetAttributeType(type = Void.class) })
 public class GdbModelTargetStackFrameRegister
 		extends DefaultTargetObject<TargetObject, GdbModelTargetStackFrameRegisterContainer> {
 
@@ -57,7 +58,8 @@ public class GdbModelTargetStackFrameRegister
 
 		changeAttributes(List.of(), Map.of( //
 			DISPLAY_ATTRIBUTE_NAME, getName(), //
-			UPDATE_MODE_ATTRIBUTE_NAME, TargetUpdateMode.FIXED //
+			UPDATE_MODE_ATTRIBUTE_NAME, TargetUpdateMode.FIXED, //
+			MODIFIED_ATTRIBUTE_NAME, false //
 		), "Initialized");
 	}
 
@@ -72,11 +74,11 @@ public class GdbModelTargetStackFrameRegister
 		boolean modified = (bigNewVal.longValue() != 0 && value.equals(oldval));
 
 		String newval = getName() + " : " + value;
-		Delta<?, ?> delta = changeAttributes(List.of(), Map.of(
-			VALUE_ATTRIBUTE_NAME, value,
-			DISPLAY_ATTRIBUTE_NAME, newval,
-			MODIFIED_ATTRIBUTE_NAME, modified),
-			"Value Updated");
+		Delta<?, ?> delta = changeAttributes(List.of(), Map.of( //
+			VALUE_ATTRIBUTE_NAME, value, //
+			DISPLAY_ATTRIBUTE_NAME, newval, //
+			MODIFIED_ATTRIBUTE_NAME, modified //
+		), "Value Updated");
 		if (delta.added.containsKey(DISPLAY_ATTRIBUTE_NAME)) {
 			listeners.fire.displayChanged(this, newval);
 		}

Ghidra/Debug/Debugger-agent-gdb/src/main/java/agent/gdb/model/impl/GdbModelTargetThread.java

@@ -32,18 +32,25 @@ import ghidra.dbg.util.PathUtils;
 import ghidra.lifecycle.Internal;
 import ghidra.util.Msg;
 
-@TargetObjectSchemaInfo(name = "Thread", elements = {
-	@TargetElementType(type = Void.class)
-}, attributes = {
-	@TargetAttributeType(type = Void.class)
-})
+@TargetObjectSchemaInfo(
+	name = "Thread",
+	elements = {
+		@TargetElementType(type = Void.class) },
+	attributes = {
+		@TargetAttributeType(type = Void.class) })
 public class GdbModelTargetThread
 		extends DefaultTargetObject<TargetObject, GdbModelTargetThreadContainer> implements
 		TargetThread<GdbModelTargetThread>, TargetExecutionStateful<GdbModelTargetThread>,
 		TargetSteppable<GdbModelTargetThread>, GdbModelSelectableObject {
 	protected static final TargetStepKindSet SUPPORTED_KINDS = TargetStepKindSet.of( //
-		TargetStepKind.ADVANCE, TargetStepKind.FINISH, TargetStepKind.LINE, TargetStepKind.OVER,
-		TargetStepKind.OVER_LINE, TargetStepKind.RETURN, TargetStepKind.UNTIL);
+		TargetStepKind.ADVANCE, //
+		TargetStepKind.FINISH, //
+		TargetStepKind.LINE, //
+		TargetStepKind.OVER, //
+		TargetStepKind.OVER_LINE, //
+		TargetStepKind.RETURN, //
+		TargetStepKind.UNTIL, //
+		TargetStepKind.EXTENDED);
 
 	protected static String indexThread(int threadId) {
 		return PathUtils.makeIndex(threadId);
@@ -75,16 +82,14 @@ public class GdbModelTargetThread
 
 		this.stack = new GdbModelTargetStack(this, inferior);
 
-		changeAttributes(List.of(),
-			List.of(
-				stack),
-			Map.of(
-				STATE_ATTRIBUTE_NAME, convertState(thread.getState()),
-				SUPPORTED_STEP_KINDS_ATTRIBUTE_NAME, SUPPORTED_KINDS,
-				DISPLAY_ATTRIBUTE_NAME, display = computeDisplay(),
-				UPDATE_MODE_ATTRIBUTE_NAME, TargetUpdateMode.FIXED,
-				stack.getName(), stack),
-			"Initialized");
+		changeAttributes(List.of(), List.of(stack), Map.of( //
+			STATE_ATTRIBUTE_NAME, convertState(thread.getState()), //
+			SUPPORTED_STEP_KINDS_ATTRIBUTE_NAME, SUPPORTED_KINDS, //
+			SHORT_DISPLAY_ATTRIBUTE_NAME, shortDisplay = computeShortDisplay(), //
+			DISPLAY_ATTRIBUTE_NAME, display = computeDisplay(), //
+			UPDATE_MODE_ATTRIBUTE_NAME, TargetUpdateMode.FIXED, //
+			stack.getName(), stack //
+		), "Initialized");
 
 		updateInfo().exceptionally(ex -> {
 			Msg.error(this, "Could not initialize thread info");
@@ -110,11 +115,9 @@ public class GdbModelTargetThread
 
 	protected String computeDisplay() {
 		StringBuilder sb = new StringBuilder();
+		sb.append(shortDisplay);
 		if (info != null) {
-			sb.append(shortDisplay);
 			sb.append(" ");
-			//sb.append(info.getTargetId());
-			//sb.append(" ");
 			sb.append(info.getInferiorName());
 			sb.append(" ");
 			sb.append(info.getState());
@@ -127,22 +130,23 @@ public class GdbModelTargetThread
 				sb.append(" in ");
 				sb.append(frame.getFunc());
 			}
-			return sb.toString();
 		}
-		sb.append(thread.getId());
-		sb.append(" ");
-		sb.append(stack.inferior.inferior.getDescriptor());
-		sb.append(" ");
-		sb.append(stack.inferior.inferior.getExecutable());
-		GdbModelTargetStackFrame top = stack.framesByLevel.get(0);
-		if (top == null) {
-			return sb.toString();
+		else {
+			sb.append(" ");
+			String executableName = stack.inferior.inferior.getExecutable();
+			if (executableName != null) {
+				sb.append(executableName);
+			}
+			GdbModelTargetStackFrame top = stack.framesByLevel.get(0);
+			if (top == null) {
+				return sb.toString();
+			}
+			sb.append(" 0x");
+			sb.append(top.frame.getAddress().toString(16));
+			sb.append(" in ");
+			sb.append(top.frame.getFunction());
+			sb.append(" ()");
 		}
-		sb.append(" 0x");
-		sb.append(top.frame.getAddress().toString(16));
-		sb.append(" in ");
-		sb.append(top.frame.getFunction());
-		sb.append(" ()");
 		return sb.toString();
 	}
 
@@ -151,10 +155,15 @@ public class GdbModelTargetThread
 		sb.append("[");
 		sb.append(inferior.getId());
 		sb.append(".");
-		sb.append(info.getId());
-		if (info.getTid() != null) {
-			sb.append(":");
-			sb.append(info.getTid());
+		if (info == null) {
+			sb.append(thread.getId());
+		}
+		else {
+			sb.append(info.getId());
+			if (info.getTid() != null) {
+				sb.append(":");
+				sb.append(info.getTid());
+			}
 		}
 		sb.append("]");
 		return sb.toString();
@@ -205,6 +214,8 @@ public class GdbModelTargetThread
 				return ExecSuffix.RETURN;
 			case UNTIL:
 				return ExecSuffix.UNTIL;
+			case EXTENDED:
+				return ExecSuffix.EXTENDED;
 			default:
 				throw new AssertionError();
 		}

Ghidra/Debug/Debugger-agent-gdb/src/test/java/agent/gdb/manager/impl/AbstractGdbManagerTest.java

@@ -25,6 +25,7 @@ import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.util.*;
 import java.util.concurrent.*;
+import java.util.function.Predicate;
 import java.util.stream.Collectors;
 
 import org.junit.*;
@@ -183,6 +184,30 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 		}
 	}
 
+	public static class LibraryWaiter extends CompletableFuture<String>
+			implements GdbEventsListenerAdapter {
+		protected final Predicate<String> predicate;
+
+		public LibraryWaiter(Predicate<String> predicate) {
+			this.predicate = predicate;
+		}
+
+		@Override
+		public void libraryLoaded(GdbInferior inferior, String name, GdbCause cause) {
+			if (predicate.test(name)) {
+				complete(name);
+			}
+		}
+	}
+
+	public void assertResponsive(GdbManager mgr) throws Throwable {
+		//Msg.debug(this, "Waiting for prompt");
+		//waitOn(mgr.waitForPrompt());
+		Msg.debug(this, "Testing echo test");
+		String out = waitOn(mgr.consoleCapture("echo test"));
+		assertEquals("test", out.trim());
+	}
+
 	@Test
 	public void testStartInterrupt() throws Throwable {
 		assumeFalse("I know no way to get this to pass with these conditions",
@@ -194,15 +219,8 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 			 * and the time its signal handlers are installed. It seems waiting for libc to load
 			 * guarantees that GDB is ready to interrupt the process.
 			 */
-			CompletableFuture<Void> libcLoaded = new CompletableFuture<>();
-			mgr.addEventsListener(new GdbEventsListenerAdapter() {
-				@Override
-				public void libraryLoaded(GdbInferior inferior, String name, GdbCause cause) {
-					if (name.contains("libc")) {
-						libcLoaded.complete(null);
-					}
-				}
-			});
+			LibraryWaiter libcLoaded = new LibraryWaiter(name -> name.contains("libc"));
+			mgr.addEventsListener(libcLoaded);
 			waitOn(startManager(mgr));
 			waitOn(mgr.currentInferior().fileExecAndSymbols("/usr/bin/sleep"));
 			waitOn(mgr.currentInferior().console("set args 3"));
@@ -211,13 +229,40 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 			Thread.sleep(100); // TODO: Why?
 			Msg.debug(this, "Interrupting");
 			waitOn(mgr.interrupt());
-			Msg.debug(this, "Waiting for prompt");
-			waitOn(mgr.waitForPrompt());
-			Msg.debug(this, "Testing echo test");
-			String out = waitOn(mgr.consoleCapture("echo test"));
-			// Check that we have a responsive console, now.
-			// Otherwise, the interrupt failed
-			assertEquals("test", out.trim());
+			waitOn(mgr.waitForState(GdbState.STOPPED));
+			assertResponsive(mgr);
+		}
+	}
+
+	@Test
+	public void testStepSyscallInterrupt() throws Throwable {
+		assumeFalse("I know no way to get this to pass with these conditions",
+			this instanceof JoinedGdbManagerTest);
+		// Repeat the start-interrupt sequence, then verify we're preparing to step a syscall
+		try (GdbManager mgr = GdbManager.newInstance()) {
+			LibraryWaiter libcLoaded = new LibraryWaiter(name -> name.contains("libc"));
+			mgr.addEventsListener(libcLoaded);
+			waitOn(startManager(mgr));
+			waitOn(mgr.currentInferior().fileExecAndSymbols("/usr/bin/sleep"));
+			waitOn(mgr.currentInferior().console("set args 5"));
+			waitOn(mgr.currentInferior().run());
+			waitOn(libcLoaded);
+			Thread.sleep(100); // TODO: Why?
+			Msg.debug(this, "Interrupting");
+			waitOn(mgr.interrupt());
+			Msg.debug(this, "Verifying at syscall");
+			String out = waitOn(mgr.consoleCapture("x/1i $pc-2"));
+			// TODO: This is x86-specific
+			assertTrue("Didn't stop at syscall", out.contains("syscall"));
+
+			// Now the real test
+			waitOn(mgr.currentInferior().step(ExecSuffix.STEP_INSTRUCTION));
+			CompletableFuture<Void> stopped = mgr.waitForState(GdbState.STOPPED);
+			Thread.sleep(100); // NB: Not exactly reliable, but verify we're waiting
+			assertFalse(stopped.isDone());
+			waitOn(mgr.interrupt());
+			waitOn(stopped);
+			assertResponsive(mgr);
 		}
 	}
 
@@ -229,7 +274,7 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 			waitOn(mgr.insertBreakpoint("main"));
 			waitOn(mgr.currentInferior().run());
 			waitOn(mgr.waitForState(GdbState.STOPPED));
-			waitOn(mgr.waitForPrompt());
+			//waitOn(mgr.waitForPrompt());
 			waitOn(mgr.currentInferior().setVar("$rax=", "0xdeadbeef")); // Corrupts it
 			String val = waitOn(mgr.currentInferior().evaluate("$rax+1"));
 			assertEquals(0xdeadbeef + 1, Integer.parseUnsignedInt(val));
@@ -270,7 +315,7 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 			waitOn(mgr.insertBreakpoint("main"));
 			GdbThread thread = waitOn(mgr.currentInferior().run());
 			waitOn(mgr.waitForState(GdbState.STOPPED));
-			waitOn(mgr.waitForPrompt());
+			//waitOn(mgr.waitForPrompt());
 			GdbRegisterSet regs = waitOn(thread.listRegisters());
 			Set<GdbRegister> toRead = new HashSet<>();
 			toRead.add(regs.get("eflags"));
@@ -306,7 +351,7 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 			waitOn(mgr.insertBreakpoint("main"));
 			GdbThread thread = waitOn(mgr.currentInferior().run());
 			waitOn(mgr.waitForState(GdbState.STOPPED));
-			waitOn(mgr.waitForPrompt());
+			//waitOn(mgr.waitForPrompt());
 			String str = waitOn(mgr.currentInferior().evaluate("(long)main"));
 			long addr = Long.parseLong(str);
 			ByteBuffer buf = ByteBuffer.allocate(1024);
@@ -336,7 +381,7 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 			waitOn(mgr.insertBreakpoint("main"));
 			GdbThread thread = waitOn(mgr.currentInferior().run());
 			waitOn(mgr.waitForState(GdbState.STOPPED));
-			waitOn(mgr.waitForPrompt());
+			//waitOn(mgr.waitForPrompt());
 			waitOn(thread.cont());
 			waitOn(mgr.waitForState(GdbState.STOPPED));
 			assertEquals(0L, (long) mgr.currentInferior().getExitCode());
@@ -351,7 +396,7 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 			waitOn(mgr.insertBreakpoint("main"));
 			GdbThread thread = waitOn(mgr.currentInferior().run());
 			waitOn(mgr.waitForState(GdbState.STOPPED));
-			waitOn(mgr.waitForPrompt());
+			//waitOn(mgr.waitForPrompt());
 			waitOn(thread.step(ExecSuffix.NEXT_INSTRUCTION));
 			waitOn(mgr.waitForState(GdbState.STOPPED));
 			assertNull(mgr.currentInferior().getExitCode());
@@ -366,7 +411,7 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 			waitOn(mgr.insertBreakpoint("main"));
 			GdbThread thread = waitOn(mgr.currentInferior().run());
 			waitOn(mgr.waitForState(GdbState.STOPPED));
-			waitOn(mgr.waitForPrompt());
+			//waitOn(mgr.waitForPrompt());
 			waitOn(thread.select());
 		}
 	}
@@ -379,7 +424,7 @@ public abstract class AbstractGdbManagerTest extends AbstractGhidraHeadlessInteg
 			waitOn(mgr.insertBreakpoint("main"));
 			GdbThread thread = waitOn(mgr.currentInferior().run());
 			waitOn(mgr.waitForState(GdbState.STOPPED));
-			waitOn(mgr.waitForPrompt());
+			//waitOn(mgr.waitForPrompt());
 			waitOn(mgr.insertBreakpoint("write"));
 			waitOn(mgr.currentInferior().cont());
 			waitOn(mgr.waitForState(GdbState.STOPPED));

Ghidra/Debug/Debugger-gadp/src/main/java/ghidra/dbg/gadp/util/GadpValueUtils.java

@@ -15,7 +15,7 @@
  */
 package ghidra.dbg.gadp.util;
 
-import static ghidra.lifecycle.Unfinished.TODO;
+import static ghidra.lifecycle.Unfinished.*;
 
 import java.util.*;
 import java.util.Map.Entry;
@@ -159,6 +159,8 @@ public enum GadpValueUtils {
 				return TargetStepKind.SKIP;
 			case SK_UNTIL:
 				return TargetStepKind.UNTIL;
+			case SK_EXTENDED:
+				return TargetStepKind.EXTENDED;
 			default:
 				throw new IllegalArgumentException();
 		}
@@ -184,6 +186,8 @@ public enum GadpValueUtils {
 				return Gadp.StepKind.SK_SKIP;
 			case UNTIL:
 				return Gadp.StepKind.SK_UNTIL;
+			case EXTENDED:
+				return Gadp.StepKind.SK_EXTENDED;
 			default:
 				throw new IllegalArgumentException();
 		}

Ghidra/Debug/Debugger-gadp/src/main/proto/gadp.proto

@@ -98,6 +98,7 @@ enum StepKind {
 	SK_SKIP = 6;
 	SK_RETURN = 7;
 	SK_UNTIL = 8;
+	SK_EXTENDED = 9;
 }
 
 message StepKindsSet {

Ghidra/Debug/Debugger-jpda/src/main/java/ghidra/dbg/jdi/model/JdiModelTargetThread.java

@@ -57,8 +57,14 @@ public class JdiModelTargetThread extends JdiModelTargetObjectReference implemen
 		JdiModelSelectableObject {
 
 	protected static final TargetStepKindSet SUPPORTED_KINDS = TargetStepKindSet.of( //
-		TargetStepKind.ADVANCE, TargetStepKind.FINISH, TargetStepKind.LINE, TargetStepKind.OVER,
-		TargetStepKind.OVER_LINE, TargetStepKind.RETURN, TargetStepKind.UNTIL);
+		TargetStepKind.ADVANCE, //
+		TargetStepKind.FINISH, //
+		TargetStepKind.LINE, //
+		TargetStepKind.OVER, //
+		TargetStepKind.OVER_LINE, //
+		TargetStepKind.RETURN, //
+		TargetStepKind.UNTIL, //
+		TargetStepKind.EXTENDED);
 
 	private EventRequestManager eventManager;
 	protected final ThreadReference thread;

Ghidra/Debug/Debugger/src/main/help/help/topics/DebuggerObjectsPlugin/DebuggerObjectsPlugin.html

@@ -27,11 +27,11 @@
     pull-down, and pop-up menus. Commands are enabled in two ways: (1) the object selected has a
     property that marks it as a logical target for that command, or (2) the object has an ancestor
     for which the command makes sense. The <A href=
-    "DebuggerObjectsPlugin.html#act_on_selection_only">Act on Selection Only</A> function
+    "DebuggerObjectsPlugin.html#act_on_selection_only">Enable By Selection Only</A> function
     determines whether both options are in play. For example, threads and inferiors/processes are
     both <B>resumable</B>, so the <A href="DebuggerObjectsPlugin.html#resume">Resume</A> action
     works on both. For many of our targets, processes are <B>interruptible</B> while threads are
-    not. Nevertheless, if <B>Act On Selection Only</B> is off, you can interrupt a thread because
+    not. Nevertheless, if <B>Enable By Selection Only</B> is off, you can interrupt a thread because
     it descends from an inferior or process. In almost every case, the selection directly or
     indirectly determines the set of valid or enabled actions.</P>
 
@@ -152,7 +152,7 @@
 
     <P>Step the current target to the next instruction in the current subroutine.</P>
 
-    <H3><A name="step_finish"></A><IMG alt="" src="images/stepout.png"> Step Finish</H3>
+    <H3><A name="step_finish"></A><IMG alt="" src="images/stepout.png"> Finish</H3>
 
     <P>Allow the current target to finish the current subroutine, pausing after.</P>
 
@@ -298,7 +298,7 @@
 
     <P>Asks the recorder to include or exclude the current object from the trace.</P>
 
-    <H3><A name="act_on_selection_only"></A>Act on Selection Only</H3>
+    <H3><A name="act_on_selection_only"></A>Enable By Selection Only</H3>
 
     <P>Toggles the scope of the other action menus. If "selection only" is chosen, the current
     object must have the property used to enable the particular action. For instance, the

Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/objects/DebuggerObjectsProvider.java

@@ -180,6 +180,13 @@ public class DebuggerObjectsProvider extends ComponentProviderAdapter implements
 	)
 	Color linkForegroundColor = Color.GREEN;
 
+	@AutoOptionDefined( //
+			name = "Default Extended Step", //
+			description = "The default string for the extended step command" //
+	//help = @HelpInfo(anchor = "colors") //
+	)
+	String extendedStep = "";
+
 	private static final Icon ENABLED_ICON = ResourceManager.loadImage("images/enabled.png");
 	private static final Icon DISABLED_ICON = ResourceManager.loadImage("images/disabled.png");
 
@@ -432,7 +439,7 @@ public class DebuggerObjectsProvider extends ComponentProviderAdapter implements
 	}
 
 	public void traceOpened(Trace trace) {
-		refresh();
+		//refresh();
 		repeatLastSet.run();
 	}
 
@@ -660,6 +667,7 @@ public class DebuggerObjectsProvider extends ComponentProviderAdapter implements
 		TargetObject targetObject = container.getTargetObject();
 		if (targetObject != null) {
 			String key = targetObject.getJoinedPath(PATH_JOIN_CHAR);
+			container.subscribe();
 			targetMap.put(key, container);
 			refSet.add(targetObject);
 			if (targetObject instanceof TargetInterpreter) {
@@ -754,6 +762,18 @@ public class DebuggerObjectsProvider extends ComponentProviderAdapter implements
 		super.closeComponent();
 	}
 
+	public void signalDataChanged(ObjectContainer container) {
+		if (pane != null) {
+			pane.signalDataChanged(container);
+		}
+	}
+
+	public void signalContentsChanged(ObjectContainer container) {
+		if (pane != null) {
+			pane.signalContentsChanged(container);
+		}
+	}
+
 	@Override
 	public void update(ObjectContainer container) {
 		if (pane != null) {
@@ -875,8 +895,8 @@ public class DebuggerObjectsProvider extends ComponentProviderAdapter implements
 		
 		groupTargetIndex++;
 
-		actionToggleSelectionOnly = new ToggleActionBuilder("Act on Selection Only", plugin.getName())
-			.menuPath("Maintenance","Act on &Selection Only")
+		actionToggleSelectionOnly = new ToggleActionBuilder("Enable By Selection Only", plugin.getName())
+			.menuPath("Maintenance","Enable By &Selection Only")
 			.menuGroup(DebuggerResources.GROUP_TARGET, "M" + groupTargetIndex)
 			.helpLocation(new HelpLocation(plugin.getName(), "act_on_selection_only"))
 			.onAction(ctx -> performToggleSelectionOnly(ctx))
@@ -1094,25 +1114,44 @@ public class DebuggerObjectsProvider extends ComponentProviderAdapter implements
 		
 		groupTargetIndex++;
 
-		new ActionBuilder("Step Finish", plugin.getName())
-			.keyBinding("F12")
-			.toolBarGroup(DebuggerResources.GROUP_CONTROL, "C" + groupTargetIndex)
-			.toolBarIcon(AbstractStepFinishAction.ICON)
-			.popupMenuPath("&Step Finish")
-			.popupMenuGroup(DebuggerResources.GROUP_CONTROL, "C" + groupTargetIndex)
-			.popupMenuIcon(AbstractStepFinishAction.ICON)
-			.helpLocation(AbstractStepFinishAction.help(plugin))
-			//.withContext(ObjectActionContext.class)
-			.enabledWhen(ctx -> 
-				isInstance(ctx, TargetSteppable.tclass) && isStopped(ctx))
-			.popupWhen(ctx -> 
-				isInstance(ctx, TargetSteppable.tclass) && isStopped(ctx))
-			.onAction(ctx -> performStepFinish(ctx))
-			.enabled(false)
-			.buildAndInstallLocal(this);
-		
-		groupTargetIndex++;
-		
+		new ActionBuilder("Finish", plugin.getName())
+		.keyBinding("F12")
+		.toolBarGroup(DebuggerResources.GROUP_CONTROL, "C" + groupTargetIndex)
+		.toolBarIcon(AbstractStepFinishAction.ICON)
+		.popupMenuPath("&Finish")
+		.popupMenuGroup(DebuggerResources.GROUP_CONTROL, "C" + groupTargetIndex)
+		.popupMenuIcon(AbstractStepFinishAction.ICON)
+		.helpLocation(AbstractStepFinishAction.help(plugin))
+		//.withContext(ObjectActionContext.class)
+		.enabledWhen(ctx -> 
+			isInstance(ctx, TargetSteppable.tclass) && isStopped(ctx))
+		.popupWhen(ctx -> 
+			isInstance(ctx, TargetSteppable.tclass) && isStopped(ctx))
+		.onAction(ctx -> performStepFinish(ctx))
+		.enabled(false)
+		.buildAndInstallLocal(this);
+	
+	groupTargetIndex++;
+	
+	new ActionBuilder("Step Last", plugin.getName())
+		.keyBinding("ALT F8")
+		.toolBarGroup(DebuggerResources.GROUP_CONTROL, "C" + groupTargetIndex)
+		.toolBarIcon(AbstractStepFinishAction.ICON)
+		.popupMenuPath("&Step Last")
+		.popupMenuGroup(DebuggerResources.GROUP_CONTROL, "C" + groupTargetIndex)
+		.popupMenuIcon(AbstractStepFinishAction.ICON)
+		.helpLocation(AbstractStepFinishAction.help(plugin))
+		//.withContext(ObjectActionContext.class)
+		.enabledWhen(ctx -> 
+			isInstance(ctx, TargetSteppable.tclass) && isStopped(ctx))
+		.popupWhen(ctx -> 
+			isInstance(ctx, TargetSteppable.tclass) && isStopped(ctx))
+		.onAction(ctx -> performStepLast(ctx))
+		.enabled(false)
+		.buildAndInstallLocal(this);
+	
+	groupTargetIndex++;
+
 		actionAddBreakpoint = new ActionBuilder("Add Breakpoint", plugin.getName())
 			.keyBinding("F3")
 			.toolBarGroup(DebuggerResources.GROUP_CONTROL, "C" + groupTargetIndex)
@@ -1475,6 +1514,26 @@ public class DebuggerObjectsProvider extends ComponentProviderAdapter implements
 		}
 	}
 
+	public void performStepLast(ActionContext context) {
+		TargetObject obj = getObjectFromContext(context);
+		if (!isLocalOnly()) {
+			DebugModelConventions.findSuitable(TargetSteppable.class, obj).thenAccept(steppable -> {
+				steppable.step(TargetStepKind.EXTENDED);
+			}).exceptionally(DebuggerResources.showError(getComponent(), "Couldn't step"));
+		}
+		else {
+			TargetSteppable<?> steppable = (TargetSteppable<?>) obj;
+			if (extendedStep.equals("")) {
+				steppable.step(TargetStepKind.EXTENDED);
+			}
+			else {
+				Map<String, String> args = new HashMap<String, String>();
+				args.put("Command", extendedStep);
+				steppable.step(args);
+			}
+		}
+	}
+
 	public void performSetBreakpoint(ActionContext context) {
 		TargetObject obj = getObjectFromContext(context);
 		if (!isLocalOnly()) {
@@ -1553,7 +1612,7 @@ public class DebuggerObjectsProvider extends ComponentProviderAdapter implements
 	public void displayChanged(TargetObject object, String display) {
 		//System.err.println("displayChanged: " + display);
 		if (ObjectContainer.visibleByDefault(object.getName())) {
-			pane.signalDataChange(getContainerByPath(object.getPath()));
+			pane.signalDataChanged(getContainerByPath(object.getPath()));
 		}
 	}
 
@@ -1579,7 +1638,7 @@ public class DebuggerObjectsProvider extends ComponentProviderAdapter implements
 
 	@Override
 	public void memoryUpdated(TargetMemory<?> memory, Address address, byte[] data) {
-		System.err.println("memoryUpdated");
+		//System.err.println("memoryUpdated");
 	}
 
 	@Override

Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/objects/ObjectContainer.java

@@ -212,11 +212,13 @@ public class ObjectContainer implements Comparable {
 	public void augmentElements(Collection<String> elementsRemoved,
 			Map<String, ? extends TargetObject> elementsAdded) {
 		Set<ObjectContainer> result = new TreeSet<ObjectContainer>();
+		boolean structureChanged = false;
 		synchronized (elementMap) {
 			for (ObjectContainer child : currentChildren) {
 				String name = child.getName();
 				if (elementsRemoved.contains(name) && !elementsAdded.containsKey(name)) {
 					elementMap.remove(name);
+					structureChanged = true;
 					continue;
 				}
 				result.add(child);
@@ -224,12 +226,21 @@ public class ObjectContainer implements Comparable {
 			for (String key : elementsAdded.keySet()) {
 				TargetObject val = elementsAdded.get(key);
 				ObjectContainer child =
-					DebuggerObjectsProvider.buildContainerFromObject(targetObject, key, val, true);
+					DebuggerObjectsProvider.buildContainerFromObject(targetObject, key, val, false);
+				if (!elementMap.containsKey(key)) {
+					structureChanged = true;
+				}
+				else {
+					provider.signalDataChanged(child);
+				}
 				elementMap.put(key, val);
 				result.add(child);
 			}
 		}
 		currentChildren = result;
+		if (structureChanged) {
+			provider.signalContentsChanged(this);
+		}
 		provider.fireObjectUpdated(this);
 		//provider.update(this);
 	}
@@ -237,11 +248,13 @@ public class ObjectContainer implements Comparable {
 	public void augmentAttributes(Collection<String> attributesRemoved,
 			Map<String, ?> attributesAdded) {
 		Set<ObjectContainer> result = new TreeSet<ObjectContainer>();
+		boolean structureChanged = false;
 		synchronized (attributeMap) {
 			for (ObjectContainer child : currentChildren) {
 				String name = child.getName();
 				if (attributesRemoved.contains(name) && !attributesAdded.containsKey(name)) {
 					attributeMap.remove(name);
+					structureChanged = true;
 					continue;
 				}
 				result.add(child);
@@ -250,16 +263,22 @@ public class ObjectContainer implements Comparable {
 				Object val = attributesAdded.get(key);
 				ObjectContainer child =
 					DebuggerObjectsProvider.buildContainerFromObject(targetObject, key, val, true);
-				if (child == null) {
-					Msg.error(this, "Null container for " + key);
-				}
-				else {
+				if (child != null) {
+					if (!attributeMap.containsKey(key)) {
+						structureChanged = true;
+					}
+					else {
+						provider.signalDataChanged(child);
+					}
 					attributeMap.put(key, val);
 					result.add(child);
 				}
 			}
 		}
 		currentChildren = result;
+		if (structureChanged) {
+			provider.signalContentsChanged(this);
+		}
 		provider.fireObjectUpdated(this);
 		//provider.update(this);
 	}

Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/objects/components/ObjectNode.java

@@ -44,6 +44,7 @@ public class ObjectNode extends GTreeSlowLoadingNode {  //extends GTreeNode
 	private String name;
 	private ObjectTree tree;
 	private Set<GTreeNode> oldChildren;
+	private boolean restructured = false;
 
 	public ObjectNode(ObjectTree tree, ObjectContainer parent, ObjectContainer container) {
 		this.tree = tree;
@@ -76,7 +77,6 @@ public class ObjectNode extends GTreeSlowLoadingNode {  //extends GTreeNode
 	}
 
 	@Override
-	//public List<GTreeNode> generateChildren() {
 	public List<GTreeNode> generateChildren(TaskMonitor monitor) throws CancelledException {
 
 		if (!container.isImmutable() || isInProgress()) {
@@ -184,20 +184,61 @@ public class ObjectNode extends GTreeSlowLoadingNode {  //extends GTreeNode
 	}
 
 	public void markExpanded() {
-		container.subscribe();
+		//container.subscribe();
 	}
 
 	public void markCollapsed() {
-		container.unsubscribe();
+		//container.unsubscribe();
 	}
 
 	public void cleanUpOldChildren(List<GTreeNode> newChildren) {
 		if (oldChildren != null) {
-			oldChildren.removeAll(newChildren);
-			for (GTreeNode node : oldChildren) {
-				tree.cleanupOldNode((ObjectNode) node);
+			synchronized (oldChildren) {
+				oldChildren.removeAll(newChildren);
+				for (GTreeNode node : oldChildren) {
+					setRestructured(true);
+					tree.cleanupOldNode((ObjectNode) node);
+				}
 			}
 		}
 		oldChildren = new HashSet<>(newChildren);
 	}
+
+	public void callUpdate() {
+		// NB: this has to be in its own thread
+		Thread thread = new Thread(new Runnable() {
+			@Override
+			public void run() {
+				List<GTreeNode> updateNodes = tree.update(container);
+				if (isRestructured()) {
+					setChildren(updateNodes);
+				}
+				// Unnecessary: fireNodeStructureChanged(ObjectNode.this);
+			}
+		});
+		thread.start();
+	}
+
+	public void callModified() {
+		// NB: this has to be in its own thread
+		Thread thread = new Thread(new Runnable() {
+			@Override
+			public void run() {
+				List<GTreeNode> updateNodes = tree.update(container);
+				for (GTreeNode n : updateNodes) {
+					n.fireNodeChanged(ObjectNode.this, n);
+				}
+			}
+		});
+		thread.start();
+	}
+
+	public boolean isRestructured() {
+		return restructured;
+	}
+
+	public void setRestructured(boolean restructured) {
+		this.restructured = restructured;
+	}
+
 }

Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/objects/components/ObjectPane.java

@@ -38,7 +38,9 @@ public interface ObjectPane {
 
 	public List<? extends Object> update(ObjectContainer container);
 
-	public void signalDataChange(ObjectContainer container);
+	public void signalDataChanged(ObjectContainer container);
+
+	public void signalContentsChanged(ObjectContainer container);
 
 	public void signalUpdate(ObjectContainer container);
 

Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/objects/components/ObjectTable.java

@@ -109,7 +109,14 @@ public class ObjectTable<R> implements ObjectPane {
 	}
 
 	@Override
-	public void signalDataChange(ObjectContainer oc) {
+	public void signalDataChanged(ObjectContainer oc) {
+		Swing.runIfSwingOrRunLater(() -> {
+			update(oc);
+		});
+	}
+
+	@Override
+	public void signalContentsChanged(ObjectContainer oc) {
 		Swing.runIfSwingOrRunLater(() -> {
 			update(oc);
 		});

Ghidra/Debug/Debugger/src/main/java/ghidra/app/plugin/core/debug/gui/objects/components/ObjectTree.java

@@ -26,6 +26,7 @@ import javax.swing.JComponent;
 import javax.swing.event.TreeExpansionEvent;
 import javax.swing.event.TreeExpansionListener;
 import javax.swing.tree.TreePath;
+import javax.swing.tree.TreeSelectionModel;
 
 import docking.widgets.tree.GTree;
 import docking.widgets.tree.GTreeNode;
@@ -92,12 +93,32 @@ public class ObjectTree implements ObjectPane {
 					}
 				}
 				provider.getTool().contextChanged(provider);
-				if (e.getEventOrigin() == EventOrigin.INTERNAL_GENERATED) {
-					restoreTreeStateManager.updateLater();
-				}
-				else {
-					currentSelectionPaths = tree.getSelectionPaths();
+				if (e.getEventOrigin() != EventOrigin.INTERNAL_GENERATED) {
+					currentExpandedPaths = tree.getExpandedPaths();
+					if (e.getEventOrigin() == EventOrigin.USER_GENERATED) {
+						currentSelectionPaths = tree.getSelectionPaths();
+						currentViewPosition = tree.getViewPosition();
+					}
+					else {
+						TreePath[] selectionPaths = tree.getSelectionPaths();
+						if (currentSelectionPaths != null && currentSelectionPaths.length > 0) {
+							if (selectionPaths != null && selectionPaths.length > 0) {
+								TreePath currentPath = currentSelectionPaths[0];
+								TreePath selectedPath = selectionPaths[0];
+								// NB. isDescendant == has a descendent
+								if (currentPath.isDescendant(selectedPath)) {
+									currentSelectionPaths = selectionPaths;
+									currentViewPosition = tree.getViewPosition();
+								}
+								else if (!selectedPath.isDescendant(currentPath)) {
+									currentSelectionPaths = selectionPaths;
+									currentViewPosition = tree.getViewPosition();
+								}
+							}
+						}
+					}
 				}
+				restoreTreeStateManager.updateLater();
 			}
 		});
 		tree.setCellRenderer(new ObjectTreeCellRenderer(root.getProvider()));
@@ -146,6 +167,7 @@ public class ObjectTree implements ObjectPane {
 			}
 		});
 
+		tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
 		tree.setSelectedNode(root);
 	}
 
@@ -209,10 +231,19 @@ public class ObjectTree implements ObjectPane {
 	}
 
 	@Override
-	public void signalDataChange(ObjectContainer container) {
+	public void signalContentsChanged(ObjectContainer container) {
+		ObjectNode node = nodeMap.get(path(container));
+		if (node != null) {
+			node.callUpdate();
+		}
+	}
+
+	@Override
+	public void signalDataChanged(ObjectContainer container) {
 		Swing.runIfSwingOrRunLater(() -> {
 			ObjectNode node = nodeMap.get(path(container));
 			if (node != null) {
+				node.setContainer(this, container.getParent(), container);
 				node.fireNodeChanged(node.getParent(), node);
 			}
 		});
@@ -288,13 +319,14 @@ public class ObjectTree implements ObjectPane {
 	public List<GTreeNode> update(ObjectContainer container) {
 		ObjectNode node = nodeMap.get(path(container));
 		if (node == null) {
-			System.err.println("Missing node: " + path(container));
+			Msg.warn(this, "Missing node: " + path(container));
 			return new ArrayList<>();
 		}
 
 		Set<ObjectContainer> currentChildren = container.getCurrentChildren();
 		List<GTreeNode> childList = new ArrayList<GTreeNode>();
 
+		node.setRestructured(false);
 		for (ObjectContainer c : currentChildren) {
 			ObjectNode nc;
 			String path = path(c);
@@ -305,6 +337,7 @@ public class ObjectTree implements ObjectPane {
 					nc.setContainer(this, container, c);
 				}
 				else {
+					node.setRestructured(true);
 					nc = new ObjectNode(this, container, c);
 				}
 				childList.add(nc);
@@ -326,10 +359,6 @@ public class ObjectTree implements ObjectPane {
 	public void setFocus(TargetFocusScope<?> object, TargetObjectRef focused) {
 		Swing.runIfSwingOrRunLater(() -> {
 			List<String> path = focused.getPath();
-			ObjectContainer container = getProvider().getContainerByPath(path);
-			if (container != null) {
-				container.subscribe();
-			}
 			tree.setSelectedNodeByNamePath(addRootNameToPath(path));
 		});
 	}
@@ -398,5 +427,4 @@ public class ObjectTree implements ObjectPane {
 			}
 		}
 	}
-
 }

Ghidra/Debug/Framework-Debugging/src/main/java/ghidra/dbg/target/TargetSteppable.java

@@ -17,6 +17,7 @@ package ghidra.dbg.target;
 
 import static ghidra.lifecycle.Unfinished.TODO;
 
+import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.CompletableFuture;
 
@@ -193,6 +194,10 @@ public interface TargetSteppable<T extends TargetSteppable<T>> extends TypedTarg
 		 * line of source code after the line which generated the instruction about to be executed.
 		 */
 		UNTIL,
+		/**
+		 * Step until some condition is met.
+		 */
+		EXTENDED,
 	}
 
 	String SUPPORTED_STEP_KINDS_ATTRIBUTE_NAME = PREFIX_INVISIBLE + "supported_step_kinds";
@@ -206,7 +211,11 @@ public interface TargetSteppable<T extends TargetSteppable<T>> extends TypedTarg
 	 * 
 	 * @return the set of supported multi-step operations
 	 */
-	@TargetAttributeType(name = SUPPORTED_STEP_KINDS_ATTRIBUTE_NAME, required = true, fixed = true, hidden = true)
+	@TargetAttributeType(
+		name = SUPPORTED_STEP_KINDS_ATTRIBUTE_NAME,
+		required = true,
+		fixed = true,
+		hidden = true)
 	public default TargetStepKindSet getSupportedStepKinds() {
 		return getTypedAttributeNowByName(SUPPORTED_STEP_KINDS_ATTRIBUTE_NAME,
 			TargetStepKindSet.class, TargetStepKindSet.of());
@@ -244,11 +253,21 @@ public interface TargetSteppable<T extends TargetSteppable<T>> extends TypedTarg
 	 */
 	public CompletableFuture<Void> step(TargetStepKind kind);
 
+	/**
+	 * Step a target using the given arguments
+	 * 
+	 * @param args the map of arguments.
+	 * @return a future which completes when the command is completed
+	 */
+	public default CompletableFuture<Void> step(Map<String, ?> args) {
+		return step(TargetStepKind.INTO);
+	}
+
 	/**
 	 * Step a single instruction
 	 * 
 	 * <p>
-	 * This convenience is exactly equivalent to calling {@code step(TargetStepKind.INSTRUCTION)}
+	 * This convenience is exactly equivalent to calling {@code step(TargetStepKind.INTO)}
 	 * 
 	 * @see #step(TargetStepKind)
 	 * @see TargetStepKind#INTO

Ghidra/Debug/ProposedUtils/src/main/java/docking/widgets/table/DefaultEnumeratedColumnTableModel.java

@@ -251,6 +251,9 @@ public class DefaultEnumeratedColumnTableModel<C extends Enum<C> & EnumeratedTab
 	@Override
 	public void delete(R row) {
 		int rowIndex = modelData.indexOf(row);
+		if (rowIndex == -1) {
+			return;
+		}
 		modelData.remove(rowIndex);
 		fireTableRowsDeleted(rowIndex, rowIndex);
 	}