Partial breakpoint support: the "break" command in the console sets &

clears breakpoints, and the 6502 core emits a "hit breakpoint" message
to standard error when it sees a breakpoint. Still TODO is to figure out
how to enter the debugger from within the 6502 core! (Stephen?)


git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@509 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba

stella/src/build/makefile

@@ -13,7 +13,7 @@
 ## See the file "license" for information on usage and redistribution of
 ## this file, and for a DISCLAIMER OF ALL WARRANTIES.
 ##
-## $Id: makefile,v 1.98 2005-06-16 01:11:26 stephena Exp $
+## $Id: makefile,v 1.99 2005-06-16 02:16:25 urchlay Exp $
 ##============================================================================
 
 ##============================================================================
@@ -164,7 +164,7 @@ GUI_OBJS = Font.o Menu.o Launcher.o \
            ProgressDialog.o \
            DebuggerDialog.o PromptWidget.o CheatWidget.o
 
-DBG_OBJS = Debugger.o DebuggerParser.o EquateList.o
+DBG_OBJS = Debugger.o DebuggerParser.o EquateList.o PackedBitArray.o
 
 CORE_OBJS = Booster.o Cart.o Cart2K.o Cart3F.o Cart4K.o CartAR.o CartDPC.o \
             CartE0.o CartE7.o CartF4.o CartF4SC.o CartF6.o CartF6SC.o \
@@ -479,3 +479,6 @@ DebuggerParser.o: $(DBG)/DebuggerParser.cxx $(DBG)/DebuggerParser.hxx
 
 EquateList.o: $(DBG)/EquateList.cxx $(DBG)/EquateList.hxx $(DBG)/Equate.hxx
 	$(CXX) -c $(FLAGS) $(OPTIONS) $(LDFLAGS) $(DBG)/EquateList.cxx
+
+PackedBitArray.o: $(DBG)/PackedBitArray.cxx $(DBG)/PackedBitArray.hxx
+	$(CXX) -c $(FLAGS) $(OPTIONS) $(LDFLAGS) $(DBG)/PackedBitArray.cxx

stella/src/debugger/Debugger.cxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: Debugger.cxx,v 1.9 2005-06-16 00:55:57 stephena Exp $
+// $Id: Debugger.cxx,v 1.10 2005-06-16 02:16:25 urchlay Exp $
 //============================================================================
 
 #include "bspf.hxx"
@@ -44,6 +44,7 @@ Debugger::Debugger(OSystem* osystem)
   // Init parser
   myParser = new DebuggerParser(this);
   equateList = new EquateList();
+  breakPoints = new PackedBitArray(0xffff);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -51,7 +52,8 @@ Debugger::~Debugger()
 {
   delete myParser;
   delete myDebugger;
-  //	delete equateList;
+  delete equateList;
+  delete breakPoints;
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -277,6 +279,8 @@ void Debugger::step()
 // to share between stack and variables, I doubt any 2600 games will ever
 // use recursion...
 
+// FIXME: TIA framebuffer should be updated during tracing!
+
 void Debugger::trace()
 {
   // 32 is the 6502 JSR instruction:
@@ -345,3 +349,13 @@ EquateList *Debugger::equates() {
   return equateList;
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void Debugger::toggleBreakPoint(int bp) {
+  mySystem->m6502().setBreakPoints(breakPoints);
+  breakPoints->toggle(bp);
+}
+
+bool Debugger::breakPoint(int bp) {
+  return breakPoints->isSet(bp) != 0;
+}
+

stella/src/debugger/Debugger.hxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: Debugger.hxx,v 1.6 2005-06-16 00:20:11 stephena Exp $
+// $Id: Debugger.hxx,v 1.7 2005-06-16 02:16:25 urchlay Exp $
 //============================================================================
 
 #ifndef DEBUGGER_HXX
@@ -29,6 +29,7 @@ class D6502;
 #include "DialogContainer.hxx"
 #include "M6502.hxx"
 #include "EquateList.hxx"
+#include "PackedBitArray.hxx"
 #include "bspf.hxx"
 
 enum {
@@ -47,7 +48,7 @@ enum {
   for all debugging operations in Stella (parser, 6502 debugger, etc).
 
   @author  Stephen Anthony
-  @version $Id: Debugger.hxx,v 1.6 2005-06-16 00:20:11 stephena Exp $
+  @version $Id: Debugger.hxx,v 1.7 2005-06-16 02:16:25 urchlay Exp $
 */
 class Debugger : public DialogContainer
 {
@@ -94,6 +95,9 @@ class Debugger : public DialogContainer
       return out;
     }
 
+    void toggleBreakPoint(int bp);
+    bool breakPoint(int bp);
+
   public:
     /**
       Run the debugger command and return the result.
@@ -144,7 +148,8 @@ class Debugger : public DialogContainer
 
     DebuggerParser* myParser;
     D6502* myDebugger;
-    EquateList *equateList;
+	 EquateList *equateList;
+    PackedBitArray *breakPoints;
 };
 
 #endif

stella/src/debugger/DebuggerParser.cxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: DebuggerParser.cxx,v 1.6 2005-06-15 23:45:04 urchlay Exp $
+// $Id: DebuggerParser.cxx,v 1.7 2005-06-16 02:16:25 urchlay Exp $
 //============================================================================
 
 #include "bspf.hxx"
@@ -33,7 +33,6 @@ enum {
 DebuggerParser::DebuggerParser(Debugger* d)
   	: debugger(d)
 {
-	equateList = d->equates();
 	done = false;
 }
 
@@ -63,7 +62,7 @@ int DebuggerParser::conv_hex_digit(char d) {
 // the hex to an int. Returns -1 on error.
 int DebuggerParser::decipher_arg(string &arg) {
 	const char *a = arg.c_str();
-	int address = equateList->getAddress(a);
+	int address = debugger->equateList->getAddress(a);
 	// cerr << "decipher_arg: equateList->getAddress(" << a << ") == " << address << endl;
 	if(address >= 0)
 		return address;
@@ -91,7 +90,7 @@ bool DebuggerParser::getArgs(const string& command) {
 	// cerr << "Parsing \"" << command << "\"" << endl;
 
 	while(*c != '\0') {
-		// cerr << "State " << state << ", *c " << *c << endl;
+		// cerr << "State " << state << ", *c '" << *c << "'" << endl;
 		switch(state) {
 			case kIN_COMMAND:
 				if(*c == ' ')
@@ -266,13 +265,23 @@ string DebuggerParser::run(const string& command) {
 		result = debugger->dumpTIA();
 	} else if(subStringMatch(verb, "reset")) {
 		debugger->reset();
+	} else if(subStringMatch(verb, "break")) {
+		if(argCount == 1) {
+			debugger->toggleBreakPoint(args[0]);
+			if(debugger->breakPoint(args[0]))
+				return "Set breakpoint";
+			else
+				return "Cleared breakpoint";
+		} else {
+			return "one argument required";
+		}
 	} else if(subStringMatch(verb, "help") || verb == "?") {
 		// please leave each option on its own line so they're
 		// easy to sort - bkw
 		return
 			"a xx      - Set Accumulator to xx\n"
 			// "break     - Show all breakpoints\n"
-			// "break xx  - Set/clear breakpoint at address xx\n"
+			"break xx  - Set/clear breakpoint at address xx\n"
 			"c         - Toggle Carry Flag\n"
 			"d         - Toggle Decimal Flag\n"
 			"loadsym f - Load DASM symbols from file f\n"

stella/src/debugger/EquateList.cxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: EquateList.cxx,v 1.6 2005-06-16 00:20:11 stephena Exp $
+// $Id: EquateList.cxx,v 1.7 2005-06-16 02:16:26 urchlay Exp $
 //============================================================================
 
 #include <string>
@@ -100,8 +100,10 @@ static struct Equate hardCodedEquates[] = {
 
 EquateList::EquateList() {
 	// cerr << sizeof(hardCodedEquates)/sizeof(struct Equate) << endl;
-	ourVcsEquates = new Equate[ sizeof(hardCodedEquates)/sizeof(struct Equate) ];
+	int size = sizeof(hardCodedEquates)/sizeof(struct Equate) + 1;
-	for(int i=0; hardCodedEquates[i].label != NULL; i++)
+	ourVcsEquates = new Equate[ size ];
+	// for(int i=0; hardCodedEquates[i].label != NULL; i++)
+	for(int i=0; i<size; i++)
 		ourVcsEquates[i] = hardCodedEquates[i];
 	calcSize();
 }
@@ -141,10 +143,15 @@ char *EquateList::getFormatted(int addr, int places) {
 	return buf;
 }
 
-int EquateList::getAddress(const char *label) {
+int EquateList::getAddress(const char *lbl) {
-	for(int i=0; ourVcsEquates[i].label != NULL; i++)
+	// cerr << "getAddress(" << lbl << ")" << endl;
-		if( strcasecmp(ourVcsEquates[i].label, label) == 0 )
+	// cerr << ourVcsEquates[0].label << endl;
+	// cerr << "shit" << endl;
+	for(int i=0; ourVcsEquates[i].label != NULL; i++) {
+		// cerr << "Looking at " << ourVcsEquates[i].label << endl;
+		if( strcasecmp(ourVcsEquates[i].label, lbl) == 0 )
 			return ourVcsEquates[i].address;
+	}
 
 	return -1;
 }

stella/src/debugger/PackedBitArray.cxx

@@ -0,0 +1,67 @@
+
+#include "bspf.hxx"
+#include "PackedBitArray.hxx"
+
+/*
+
+		boolean set();
+		boolean clear();
+
+		void set(int bit);
+		void clear(int bit);
+		void toggle(int bit);
+*/
+
+PackedBitArray::PackedBitArray(int length) {
+	size = length;
+	words = length / wordSize + 1;
+	bits = new unsigned int[ words ];
+
+	// FIXME: find out if this is necessary (does a new array
+	// start out zeroed already?
+	for(int i=0; i<words; i++)
+		bits[i] = 0;
+
+	// cerr << "size==" << size << " words==" << words << endl;
+}
+
+PackedBitArray::~PackedBitArray() {
+	delete bits;
+}
+
+int PackedBitArray::isSet(unsigned int bit) {
+	unsigned int word = bit / wordSize;
+	bit %= wordSize;
+
+	return (bits[word] & (1 << bit));
+}
+
+int PackedBitArray::isClear(unsigned int bit) {
+	unsigned int word = bit / wordSize;
+	bit %= wordSize;
+
+	return !(bits[word] & (1 << bit));
+}
+
+void PackedBitArray::toggle(unsigned int bit) {
+	unsigned int word = bit / wordSize;
+	bit %= wordSize;
+
+	// cerr << "word==" << word << ", bit==" << bit << endl;
+
+	bits[word] ^= (1 << bit);
+}
+
+void PackedBitArray::set(unsigned int bit) {
+	unsigned int word = bit / wordSize;
+	bit %= wordSize;
+
+	bits[word] |= (1 << bit);
+}
+
+void PackedBitArray::clear(unsigned int bit) {
+	unsigned int word = bit / wordSize;
+	bit %= wordSize;
+
+	bits[word] &= (~(1 << bit));
+}

stella/src/debugger/PackedBitArray.hxx

@@ -0,0 +1,32 @@
+
+#ifndef PACKEDBITARRAY_HXX
+#define PACKEDBITARRAY_HXX
+
+#include "bspf.hxx"
+
+#define wordSize ( (sizeof(unsigned int)) * 8)
+
+class PackedBitArray {
+	public:
+		PackedBitArray(int length);
+		~PackedBitArray();
+
+		int isSet(unsigned int bit);
+		int isClear(unsigned int bit);
+
+		void set(unsigned int bit);
+		void clear(unsigned int bit);
+		void toggle(unsigned int bit);
+
+	private:
+		// number of bits in the array:
+		int size;
+
+		// number of unsigned ints (size/wordSize):
+		int words;
+
+		// the array itself:
+		unsigned int *bits;
+};
+
+#endif

stella/src/emucore/m6502/src/M6502.cxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: M6502.cxx,v 1.4 2005-06-16 01:11:28 stephena Exp $
+// $Id: M6502.cxx,v 1.5 2005-06-16 02:16:26 urchlay Exp $
 //============================================================================
 
 #include "M6502.hxx"
@@ -25,6 +25,7 @@ M6502::M6502(uInt32 systemCyclesPerProcessorCycle)
       mySystemCyclesPerProcessorCycle(systemCyclesPerProcessorCycle)
 {
   uInt16 t;
+  breakPoints = NULL;
 
   // Compute the BCD lookup table
   for(t = 0; t < 256; ++t)
@@ -332,3 +333,7 @@ const char* M6502::ourInstructionMnemonicTable[256] = {
   "BEQ",  "SBC",  "n/a",  "isb",  "nop",  "SBC",  "INC",  "isb",    // 0xF?
   "SED",  "SBC",  "nop",  "isb",  "nop",  "SBC",  "INC",  "isb"
 };
+
+void M6502::setBreakPoints(PackedBitArray *bp) {
+	breakPoints = bp;
+}

stella/src/emucore/m6502/src/M6502.hxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: M6502.hxx,v 1.3 2005-06-16 01:11:28 stephena Exp $
+// $Id: M6502.hxx,v 1.4 2005-06-16 02:16:26 urchlay Exp $
 //============================================================================
 
 #ifndef M6502_HXX
@@ -26,6 +26,7 @@ class Deserializer;
 
 #include "bspf.hxx"
 #include "System.hxx"
+#include "PackedBitArray.hxx"
 
 /**
   This is an abstract base class for classes that emulate the
@@ -33,7 +34,7 @@ class Deserializer;
   has a 64K addressing space.
 
   @author  Bradford W. Mott
-  @version $Id: M6502.hxx,v 1.3 2005-06-16 01:11:28 stephena Exp $ 
+  @version $Id: M6502.hxx,v 1.4 2005-06-16 02:16:26 urchlay Exp $ 
 */
 class M6502
 {
@@ -166,6 +167,9 @@ class M6502
     */
     friend ostream& operator<<(ostream& out, const AddressingMode& mode);
 
+  public:
+    void setBreakPoints(PackedBitArray *bp);
+
   protected:
     /**
       Get the 8-bit value of the Processor Status register.
@@ -197,6 +201,8 @@ class M6502
     bool notZ;  // Z flag complement for processor status register
     bool C;     // C flag for processor status register
 
+    PackedBitArray *breakPoints;
+
     /** 
       Bit fields used to indicate that certain conditions need to be 
       handled such as stopping execution, fatal errors, maskable interrupts 

stella/src/emucore/m6502/src/M6502Hi.cxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: M6502Hi.cxx,v 1.3 2005-06-16 01:11:28 stephena Exp $
+// $Id: M6502Hi.cxx,v 1.4 2005-06-16 02:16:26 urchlay Exp $
 //============================================================================
 
 #include "M6502Hi.hxx"
@@ -73,6 +73,12 @@ bool M6502High::execute(uInt32 number)
       uInt16 operandAddress = 0;
       uInt8 operand = 0;
 
+      if(breakPoints != NULL)
+      {
+        if(breakPoints->isSet(PC))
+          cerr << "hit breakpoint at " << PC << endl;
+      }
+
 #ifdef DEBUG
       debugStream << "PC=" << hex << setw(4) << PC << " ";
 #endif

stella/src/emucore/m6502/src/M6502Low.cxx

@@ -13,7 +13,7 @@
 // See the file "license" for information on usage and redistribution of
 // this file, and for a DISCLAIMER OF ALL WARRANTIES.
 //
-// $Id: M6502Low.cxx,v 1.3 2005-06-16 01:11:29 stephena Exp $
+// $Id: M6502Low.cxx,v 1.4 2005-06-16 02:16:26 urchlay Exp $
 //============================================================================
 
 #include "M6502Low.hxx"
@@ -59,6 +59,12 @@ bool M6502Low::execute(uInt32 number)
       uInt16 operandAddress = 0;
       uInt8 operand = 0;
 
+      if(breakPoints != NULL)
+      {
+        if(breakPoints->isSet(PC))
+          cerr << "hit breakpoint at " << PC << endl;
+      }
+
 #ifdef DEBUG
       debugStream << "PC=" << hex << setw(4) << PC << " ";
 #endif