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* Correct implementation of Indirect Indexed and Indexed Indirect addressing modes.
* Unit tests for Indirect Indexed and Indexed Indirect. * Updated copyright dates. * Started moving to JUnit 4.
This commit is contained in:
Seth Morabito
parent
d858a50f1b
commit
f174f0312f
2
COPYING
2
COPYING
@ -1,6 +1,6 @@
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The MIT License
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Copyright (c) 2008,2009 Seth J. Morabito <sethm@loomcom.com>
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Copyright (c) 2008-2010 Seth J. Morabito <sethm@loomcom.com>
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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27
README
27
README
@ -11,8 +11,8 @@ deemed ready for testing, it will be given a version number of "0.1".
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====================================================================
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Version: PRERELEASE
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Last Updated: 07 January, 2009
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Copyright (c) 2008,2009 Seth J. Morabito <sethm@loomcom.com>
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Last Updated: 10 January, 2010
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Copyright (c) 2008-2010 Seth J. Morabito <sethm@loomcom.com>
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See the file COPYING for license.
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@ -36,7 +36,7 @@ ACIAs. More functionality may be considered as time goes on.
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- Java 1.5 or higher
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- Maven 2.0.x or higher (for building from source)
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- JUnit 3.0 or higher (for testing)
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- JUnit 4 or higher (for testing)
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(More to come!)
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@ -44,25 +44,8 @@ ACIAs. More functionality may be considered as time goes on.
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---------
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- Finish core functionality.
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- Implement remaining addressing modes.
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COMPLETED ADDRESSING MODES:
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o Implied
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o Immediate
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o Zero Page
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o Accumulator
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o Absolute
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o Indirect [used only by JMP]
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o Zero Page, X-indexed
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o Zero Page, Y-indexed
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o Absolute, X-indexed
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o Absolute, Y-indexed
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o Relative
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INCOMPLETE ADDRESSING MODES:
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o Indexed Indirect [ (Indirect ,X) ]
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o Indirect Indexed [ (Indirect),Y ]
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- Finish command monitor.
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- Refactor address decoding (second refactor to DRY up more).
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- Clean up JavaDoc.
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- Implement CMOS 65C02 instructions and NMOS / CMOS mode flag.
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8
pom.xml
8
pom.xml
@ -11,21 +11,21 @@
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>3.8.1</version>
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<version>4.7</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<!-- Set Java version to 6 -->
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<!-- Set Java version to Java 1.5 -->
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<!-- best lock down version of the plugin too -->
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<configuration>
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<source>5</source>
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<target>5</target>
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<source>1.5</source>
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<target>1.5</target>
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</configuration>
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</plugin>
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@ -29,11 +29,11 @@ public class CommandParser {
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System.exit(1);
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}
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}
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public void setSimulator(Simulator sim) {
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this.simulator = sim;
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}
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public Simulator getSimulator() {
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return this.simulator;
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}
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@ -192,8 +192,8 @@ public class Cpu implements InstructionTable {
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case 1:
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switch(irAddressMode) {
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case 0: // (Zero Page,X)
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// TODO: UNIT TESTS
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effectiveAddress = bus.read(zpxAddress(args[0]));
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tmp = args[0] + getXRegister();
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effectiveAddress = address(bus.read(tmp), bus.read(tmp + 1));
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effectiveData = bus.read(effectiveAddress);
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break;
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case 1: // Zero Page
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@ -209,11 +209,12 @@ public class Cpu implements InstructionTable {
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effectiveData = bus.read(effectiveAddress);
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break;
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case 4: // (Zero Page),Y
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// TODO: UNIT TESTS
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effectiveAddress = yAddress(bus.read(args[0]), getYRegister());
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tmp = address(bus.read(args[0]),
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bus.read((args[0]+1)&0xff));
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effectiveAddress = (tmp + getYRegister())&0xffff;
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effectiveData = bus.read(effectiveAddress);
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break;
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case 5: // Zero Page, X
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case 5: // Zero Page,X
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effectiveAddress = zpxAddress(args[0]);
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effectiveData = bus.read(effectiveAddress);
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break;
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@ -418,14 +419,14 @@ public class Cpu implements InstructionTable {
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/** ASL - Arithmetic Shift Left *****************************************/
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case 0x0a: // ASL - Accumulator
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case 0x0a: // Accumulator
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a = asl(a);
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setArithmeticFlags(a);
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break;
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case 0x06: // ASL - Zero Page
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case 0x0e: // ASL - Absolute
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case 0x16: // ASL - Zero Page,X
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case 0x1e: // ASL - Absolute,X
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case 0x06: // Zero Page
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case 0x0e: // Absolute
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case 0x16: // Zero Page,X
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case 0x1e: // Absolute,X
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tmp = asl(effectiveData);
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bus.write(effectiveAddress, tmp);
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setArithmeticFlags(tmp);
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@ -457,14 +458,14 @@ public class Cpu implements InstructionTable {
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/** ROL - Rotate Left ***************************************************/
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case 0x2a: // ROL - Accumulator
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case 0x2a: // Accumulator
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a = rol(a);
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setArithmeticFlags(a);
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break;
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case 0x26: // ROL - Zero Page
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case 0x2e: // ROL - Absolute
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case 0x36: // ROL - Zero Page,X
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case 0x3e: // ROL - Absolute,X
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case 0x26: // Zero Page
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case 0x2e: // Absolute
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case 0x36: // Zero Page,X
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case 0x3e: // Absolute,X
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tmp = rol(effectiveData);
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bus.write(effectiveAddress, tmp);
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setArithmeticFlags(tmp);
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@ -472,28 +473,28 @@ public class Cpu implements InstructionTable {
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/** EOR - Exclusive OR **************************************************/
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case 0x41: // EOR - (Zero Page, X)
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case 0x45: // EOR - Zero Page
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case 0x49: // EOR - Immediate
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case 0x4d: // EOR - Absolute
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case 0x51: // EOR - (Zero Page,Y)
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case 0x55: // EOR - Zero Page,X
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case 0x59: // EOR - Absolute,Y
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case 0x5d: // EOR - Absolute,X
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case 0x41: // (Zero Page,X)
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case 0x45: // Zero Page
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case 0x49: // Immediate
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case 0x4d: // Absolute
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case 0x51: // (Zero Page,Y)
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case 0x55: // Zero Page,X
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case 0x59: // Absolute,Y
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case 0x5d: // Absolute,X
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a ^= effectiveData;
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setArithmeticFlags(a);
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break;
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/** LSR - Logical Shift Right *******************************************/
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case 0x4a: // LSR - Accumulator
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case 0x4a: // Accumulator
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a = lsr(a);
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setArithmeticFlags(a);
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break;
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case 0x46: // LSR - Zero Page
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case 0x4e: // LSR - Absolute
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case 0x56: // LSR - Zero Page,X
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case 0x5e: // LSR - Absolute,X
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case 0x46: // Zero Page
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case 0x4e: // Absolute
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case 0x56: // Zero Page,X
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case 0x5e: // Absolute,X
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tmp = lsr(effectiveData);
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bus.write(effectiveAddress, tmp);
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setArithmeticFlags(tmp);
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@ -533,7 +534,7 @@ public class Cpu implements InstructionTable {
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/** STA - Store Accumulator *********************************************/
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case 0x81: // (Zero Page, X)
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case 0x81: // (Zero Page,X)
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case 0x85: // Zero Page
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case 0x8d: // Absolute
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case 0x91: // (Zero Page),Y
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@ -564,11 +565,11 @@ public class Cpu implements InstructionTable {
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/** LDY - Load Y Register ***********************************************/
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case 0xa0: // LDY - Immediate
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case 0xa4: // LDY - Zero Page
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case 0xac: // LDY - Absolute
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case 0xb4: // LDY - Zero Page,X
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case 0xbc: // LDY - Absolute,X
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case 0xa0: // Immediate
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case 0xa4: // Zero Page
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case 0xac: // Absolute
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case 0xb4: // Zero Page,X
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case 0xbc: // Absolute,X
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y = effectiveData;
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setArithmeticFlags(y);
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break;
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@ -586,7 +587,7 @@ public class Cpu implements InstructionTable {
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/** LDA - Load Accumulator **********************************************/
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case 0xa1: // Zero Page, X)
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case 0xa1: // (Zero Page,X)
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case 0xa5: // Zero Page
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case 0xa9: // Immediate
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case 0xad: // Absolute
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@ -608,11 +609,11 @@ public class Cpu implements InstructionTable {
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/** CMP - Compare Accumulator *******************************************/
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case 0xc1: // (Zero Page, X)
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case 0xc1: // (Zero Page,X)
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case 0xc5: // Zero Page
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case 0xc9: // #Immediate
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case 0xcd: // Absolute
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case 0xd1: // (Zero Page), Y
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case 0xd1: // (Zero Page),Y
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case 0xd5: // Zero Page,X
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case 0xd9: // Absolute,Y
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case 0xdd: // Absolute,X
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@ -623,7 +624,7 @@ public class Cpu implements InstructionTable {
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/** DEC - Decrement Memory **********************************************/
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case 0xc6: // Zero Page
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case 0xce: // Absolute
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case 0xd6: // Zero Page, X
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case 0xd6: // Zero Page,X
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case 0xde: // Absolute,X
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tmp = --effectiveData & 0xff;
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bus.write(effectiveAddress, tmp);
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@ -640,11 +641,11 @@ public class Cpu implements InstructionTable {
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/** SBC - Subtract with Carry (Borrow) **********************************/
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case 0xe1: // (Zero Page, X)
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case 0xe1: // (Zero Page,X)
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case 0xe5: // Zero Page
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case 0xe9: // Immediate
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case 0xed: // Absolute
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case 0xf1: // (Zero Page), Y
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case 0xf1: // (Zero Page),Y
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case 0xf5: // Zero Page,X
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case 0xf9: // Absolute,Y
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case 0xfd: // Absolute,X
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@ -1255,7 +1256,7 @@ public class Cpu implements InstructionTable {
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* Given two bytes, return an address.
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*/
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int address(int lowByte, int hiByte) {
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return ((hiByte<<8)|lowByte);
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return ((hiByte<<8)|lowByte) & 0xffff;
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}
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/**
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@ -1313,8 +1314,34 @@ public class Cpu implements InstructionTable {
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case ABS:
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sb.append(String.format(" $%04X", address(op1, op2)));
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break;
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case ABX:
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sb.append(String.format(" $%04X,X", address(op1, op2)));
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break;
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case ABY:
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sb.append(String.format(" $%04X,Y", address(op1, op2)));
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break;
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case IMM:
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sb.append(String.format(" #$%02X", op1));
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break;
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case IND:
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sb.append(String.format(" ($%04X)", address(op1, op2)));
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break;
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case XIN:
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sb.append(String.format(" ($%02X),X", op1));
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break;
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case INY:
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sb.append(String.format(" ($%02X,Y)", op1));
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break;
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case REL:
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case ZPG:
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sb.append(String.format(" $%02X", op1));
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break;
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case ZPX:
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sb.append(String.format(" $%02X,X", op1));
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break;
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case ZPY:
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sb.append(String.format(" $%02X,Y", op1));
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break;
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}
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return sb.toString();
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@ -0,0 +1,82 @@
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package com.loomcom.symon;
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import com.loomcom.symon.devices.Memory;
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import com.loomcom.symon.exceptions.MemoryAccessException;
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import org.junit.*;
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import static org.junit.Assert.*;
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public class CpuIndexedIndirectModeTest {
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protected Cpu cpu;
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protected Bus bus;
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protected Memory mem;
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@Before
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public void runBeforeEveryTest() throws Exception {
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this.cpu = new Cpu();
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this.bus = new Bus(0x0000, 0xffff);
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this.mem = new Memory(0x0000, 0x10000);
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bus.addCpu(cpu);
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bus.addDevice(mem);
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// Load the reset vector.
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bus.write(0xfffc, Cpu.DEFAULT_BASE_ADDRESS & 0x00ff);
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bus.write(0xfffd, (Cpu.DEFAULT_BASE_ADDRESS & 0xff00)>>>8);
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cpu.reset();
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// Assert initial state
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assertEquals(0, cpu.getAccumulator());
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assertEquals(0, cpu.getXRegister());
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assertEquals(0, cpu.getYRegister());
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assertEquals(0x200, cpu.getProgramCounter());
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assertEquals(0xff, cpu.getStackPointer());
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assertEquals(0x20, cpu.getProcessorStatus());
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}
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@Test
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public void test_LDA() throws Exception {
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bus.write(0x008c, 0x3f);
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bus.write(0x008d, 0xc4);
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bus.write(0xc43f, 0x45);
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cpu.setXRegister(0x0c);
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bus.loadProgram(0xa1, 0x80); // LDA ($80,X)
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cpu.step(1);
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assertEquals(0x45, cpu.getAccumulator());
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}
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@Test
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public void test_ORA() throws Exception {
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bus.write(0x0012, 0x1f);
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bus.write(0x0013, 0xc5);
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bus.write(0xc51f, 0x31);
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cpu.setXRegister(0x02);
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cpu.setAccumulator(0x15);
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bus.loadProgram(0x01, 0x10); // ORA ($10,X)
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cpu.step(1);
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assertEquals(0x35, cpu.getAccumulator());
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assertEquals(0x31, bus.read(0xc51f));
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}
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@Test
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public void test_AND() throws Exception {
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bus.write(0x0012, 0x1f);
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bus.write(0x0013, 0xc5);
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bus.write(0xc51f, 0x31);
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cpu.setXRegister(0x02);
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cpu.setAccumulator(0x15);
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bus.loadProgram(0x21, 0x10); // AND ($10,X)
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cpu.step(1);
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assertEquals(0x11, cpu.getAccumulator());
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assertEquals(0x31, bus.read(0xc51f));
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}
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}
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@ -0,0 +1,84 @@
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package com.loomcom.symon;
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import com.loomcom.symon.devices.Memory;
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import com.loomcom.symon.exceptions.MemoryAccessException;
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import org.junit.*;
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import static org.junit.Assert.*;
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public class CpuIndirectIndexedModeTest {
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protected Cpu cpu;
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protected Bus bus;
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protected Memory mem;
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@Before
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public void runBeforeEveryTest() throws Exception {
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this.cpu = new Cpu();
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this.bus = new Bus(0x0000, 0xffff);
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this.mem = new Memory(0x0000, 0x10000);
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bus.addCpu(cpu);
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bus.addDevice(mem);
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// Load the reset vector.
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bus.write(0xfffc, Cpu.DEFAULT_BASE_ADDRESS & 0x00ff);
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bus.write(0xfffd, (Cpu.DEFAULT_BASE_ADDRESS & 0xff00)>>>8);
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cpu.reset();
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// Assert initial state
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assertEquals(0, cpu.getAccumulator());
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assertEquals(0, cpu.getXRegister());
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assertEquals(0, cpu.getYRegister());
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assertEquals(0x200, cpu.getProgramCounter());
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assertEquals(0xff, cpu.getStackPointer());
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assertEquals(0x20, cpu.getProcessorStatus());
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}
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@Test
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public void test_LDA() throws Exception {
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assertEquals(cpu.toString(), 0x00, cpu.getAccumulator());
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bus.write(0x0014, 0x00);
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bus.write(0x0015, 0xd8);
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bus.write(0xd828, 0x03);
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cpu.setYRegister(0x28);
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bus.loadProgram(0xb1, 0x14); // LDA ($14),Y
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cpu.step(1);
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assertEquals(0x03, cpu.getAccumulator());
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}
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@Test
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public void test_ORA() throws Exception {
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bus.write(0x0014, 0x00);
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bus.write(0x0015, 0xd8);
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bus.write(0xd828, 0xe3);
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cpu.setYRegister(0x28);
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cpu.setAccumulator(0x32);
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bus.loadProgram(0x11, 0x14); // ORA ($14),Y
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cpu.step(1);
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assertEquals(0xf3, cpu.getAccumulator());
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assertEquals(0xe3, bus.read(0xd828));
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}
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@Test
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public void test_AND() throws Exception {
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bus.write(0x0014, 0x00);
|
||||
bus.write(0x0015, 0xd8);
|
||||
bus.write(0xd828, 0xe3);
|
||||
|
||||
cpu.setYRegister(0x28);
|
||||
cpu.setAccumulator(0x32);
|
||||
|
||||
bus.loadProgram(0x31, 0x14); // AND ($14),Y
|
||||
cpu.step(1);
|
||||
|
||||
assertEquals(0x22, cpu.getAccumulator());
|
||||
assertEquals(0xe3, bus.read(0xd828));
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
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Reference in New Issue
Block a user