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A Gentle Guide to Using the LC-3 Simulator

0. Conventions

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Throughout this document, commands that you have to type or buttonsyou have to click will appear like so.

1. Getting Java

The LC-3 Simulator is written in Java, which means Java must beinstalled on the computer you plan to use. Java should already beavailable on all public SEAS machines. If you plan to work on yourpersonal machine, you may need to install Java yourself. You can download Java here. TheLC-3 simulator requires Java 1.4 or newer (which is available forWindows, Linux, and Mac OS X).

2. Getting the Simulator

Next, you need to download the simulator. It is distributed in a .jarfile (short for Java ARchive) which you can download here. In Windows or on a Mac, youshould be able to double-click the .jar file to launch thesimulator. You can also launch the simulator from the command line ofyour operating system (such as Linux) by using the command java -jar (jarfile). You should see the simulatorscreen, much like the screenshot below. Cyberduck free ftp.

If you have any problems starting the simulator, please post yourproblems to the CSE240 General Discussion Forum. This will ensure thefastest response.

We will not be distributing the source to the simulator, becausea later assignment will build parts of the simulator in C (which issimilar to Java in many ways).

3. Assembling and Loading Software

Now the simulator is running, but to get it to do anythinginteresting, we need to load some software. The first piece ofsoftware we should load is, naturally, an operating system. The LC-3operating system is very basic: it handles simple I/O operations andis responsible for starting other programs, such as the ones you'llwrite for this homework. Download the LC-3 OShere.

So that you can understand what the operating system does, wedistribute it as an assembly language file. But the LC-3 machinedoesn't understand assembly directly; we first have to 'assemble' theassembly code into machine language (a .obj file containing binarydata). The LC-3 simulator has a built-in assembler, accessible (as isthe case for most of its functionality) via the Command Line text box(see screenshot above). To assemble the operating system, type as lc3os.asm at the command line and hitenter. Make sure that the OS file is in the same directory as the .jarfile; the as command also understandsrelative and absolute paths if the OS is in a different directory. Output from the assembly process is displayed in the CommandLine Output Pane. Afterassembling the OS, you should notice that 2 new files, lc3os.obj andlc3os.sym, have been created. The .obj file is the machine languageencoding of the assembly language file, and the .sym file is a textfile that holds symbol information so the simulator can display yoursymbols. Recall that symbols are really just a convenience for sillyhumans; the machine language encoding knows only about offsets.

How do you save an imovie. Now we can load the lc3os.obj file into the simulator, either via thecommand load lc3os.obj or by going to theFile menu and selecting Open .obj file. Notice that the contents of thememory change when the OS is loaded.

Now assemble and load the solution file forProblem 0 into the simulator. The memory has changed again, but youmay not notice since the relevant memory addresses (starting at x3000)aren't visible unless you've scrolled the screen. User-level programs(i.e., non-OS code) start, by convention, at x3000. If you type thecommand list x3000 the memory view willjump to x3000 and you can see the 1-instruction solution to thisproblem.

4. Running Code

To actually run code, you can use the 4 control buttons at the top ofthe simulator, or type commands into the command line interface (thecommand names are the same as the buttons). Note that the PC registeris set to x0200, which is the entry point to the operating system byconvention. Recall that the solution code for Problem0 increments the value in R2 and puts the result in R5. Set thevalue in R2 to something you fancy, either by double-clicking it inthe Registers section, or via the command set R2(value). Now, actually run the code by hitting the continue button. The value magically getsincremented and moved to R5. Neat-o! Also observe that the PC nowpoints to x0263, an apparently random value somewhere in the operatingsystem, and that the Status Display tells us the machine is halted.

4a. Running Code..slowly

Clearly, some things are going on here. But to determine what they areexactly, we need to slow the execution down. You can hit the stop button to pause the machine while it'sexecuting, but this doesn't give you very fine-grained control. Thecontinue command will start runninginstructions as fast as possible, but often we want to go just oneinstruction at a time. This is what the next and stepcommands allow us to do. They both go one instruction at a time, but thestep command will 'follow' function callsand traps, while next just goes from lineto line, 'over' function calls and traps and stopping only at the instructionimmediately after them. Both next and step will 'follow' branches. The LC-3 Manual has a more involved discussion,with an example, of the difference between next and step.

Let's try running the program again, but just one instruction at atime. Notice that from the halted state, the PC points to aninstruction that will branch us right back to the start of theoperating system. So we can hit next onceand start the cycle over again. Note that registers are as we leftthem. You can put a new value into R2 if you want, and the old valuein R5 will get overwritten. Sometimes, having old values lying aroundeverywhere can be problematic, and it's good to do a real 'reboot' viathe reset command. This clears allof memory and resets registers to default values, so you have toreload the OS and your program.

You can keep next-ing over the OS code;eventually you will hit the RTT instruction at location x0205 thatjumps to the start of our program at x3000. Now you can see the 2instructions that constitute our program. You can see the ADD beingperformed, and then the machine gets halted again.

Continue running the increment-R2-into-R5 code until, if ever, you getbored. Then move on to Problem 1.

4b. Running Code..for a little while

Going one instruction at a time is great, but somewhat tedious. Weneed a happy medium between not knowing what's going on at all, andhaving to go through every single instruction, whether we care aboutit or not. Breakpoints are this happy medium.

A breakpoint is set at a particular memory location, and tells thesimulator to stop execution upon reaching that point. Memory locationswith breakpoints set on them show up in the simulator with a redsquare in the 'BP' column. It is left as an exercise to the reader todetermine what 'BP' stands for. You can set a breakpoint at a memorylocation with the command break set (memorylocation), or by checking the checkbox in the 'BP' column. Youcan get rid of a previously-set breakpoint with the command break clear (memory location), or byun-checking a previously checked box. You can also set and clearbreakpoints at labels, instead of specifying a hex memory location.

When you tell the simulator to continue,it will only run until it hits a breakpoint (or the system halts orhas an error). When you are writing and testing your answer forProblem 1, you can use the command breakpointset START to set a breakpoint at the beginning of yourcode. Then, you can use continue to skipall the OS code and get to the instructions you care about. Then youcan next over your code to make sure it'sdoing what you want it to do.

5. Running Scripts

Now try running some of the test scripts that we've provided forProblem 1. You can do this with the command script (scriptfile). LC-3 script files are .lcsfiles, but are really just plain text, and the file extension doesn'treally matter. Ways to cheat a slot machine. If you open the script file with a text editor, you cansee that the script commands are the same as those you type at thecommand line. For repetitive tasks, using a script file can save youtime, and perhaps the lifelong agony of RepetitiveStrain Injury.

Scripting is also a great way of testing your code. You can write afew test cases and check your code easily, especially for the problemsin this homework which are pretty easy to test. Use the check command to verify that a value is whatyou think it should be. We've distributed a few test scripts for theproblems in this homework, but they don't cover all the importantcases, so you should augment our scripts with some of your own.

6. General Help and Advice

This document doesn't cover all of the simulator's functionality; foran extended discussion of usage see the LC-3Simulator Manual. For quick help within the simulator itself,you can use the help command to see alist of all of the LC-3's commands. Use help(command) to get help on a specific command.

So that you can understand what the operating system does, wedistribute it as an assembly language file. But the LC-3 machinedoesn't understand assembly directly; we first have to 'assemble' theassembly code into machine language (a .obj file containing binarydata). The LC-3 simulator has a built-in assembler, accessible (as isthe case for most of its functionality) via the Command Line text box(see screenshot above). To assemble the operating system, type as lc3os.asm at the command line and hitenter. Make sure that the OS file is in the same directory as the .jarfile; the as command also understandsrelative and absolute paths if the OS is in a different directory. Output from the assembly process is displayed in the CommandLine Output Pane. Afterassembling the OS, you should notice that 2 new files, lc3os.obj andlc3os.sym, have been created. The .obj file is the machine languageencoding of the assembly language file, and the .sym file is a textfile that holds symbol information so the simulator can display yoursymbols. Recall that symbols are really just a convenience for sillyhumans; the machine language encoding knows only about offsets.

How do you save an imovie. Now we can load the lc3os.obj file into the simulator, either via thecommand load lc3os.obj or by going to theFile menu and selecting Open .obj file. Notice that the contents of thememory change when the OS is loaded.

Now assemble and load the solution file forProblem 0 into the simulator. The memory has changed again, but youmay not notice since the relevant memory addresses (starting at x3000)aren't visible unless you've scrolled the screen. User-level programs(i.e., non-OS code) start, by convention, at x3000. If you type thecommand list x3000 the memory view willjump to x3000 and you can see the 1-instruction solution to thisproblem.

4. Running Code

To actually run code, you can use the 4 control buttons at the top ofthe simulator, or type commands into the command line interface (thecommand names are the same as the buttons). Note that the PC registeris set to x0200, which is the entry point to the operating system byconvention. Recall that the solution code for Problem0 increments the value in R2 and puts the result in R5. Set thevalue in R2 to something you fancy, either by double-clicking it inthe Registers section, or via the command set R2(value). Now, actually run the code by hitting the continue button. The value magically getsincremented and moved to R5. Neat-o! Also observe that the PC nowpoints to x0263, an apparently random value somewhere in the operatingsystem, and that the Status Display tells us the machine is halted.

4a. Running Code..slowly

Clearly, some things are going on here. But to determine what they areexactly, we need to slow the execution down. You can hit the stop button to pause the machine while it'sexecuting, but this doesn't give you very fine-grained control. Thecontinue command will start runninginstructions as fast as possible, but often we want to go just oneinstruction at a time. This is what the next and stepcommands allow us to do. They both go one instruction at a time, but thestep command will 'follow' function callsand traps, while next just goes from lineto line, 'over' function calls and traps and stopping only at the instructionimmediately after them. Both next and step will 'follow' branches. The LC-3 Manual has a more involved discussion,with an example, of the difference between next and step.

Let's try running the program again, but just one instruction at atime. Notice that from the halted state, the PC points to aninstruction that will branch us right back to the start of theoperating system. So we can hit next onceand start the cycle over again. Note that registers are as we leftthem. You can put a new value into R2 if you want, and the old valuein R5 will get overwritten. Sometimes, having old values lying aroundeverywhere can be problematic, and it's good to do a real 'reboot' viathe reset command. This clears allof memory and resets registers to default values, so you have toreload the OS and your program.

You can keep next-ing over the OS code;eventually you will hit the RTT instruction at location x0205 thatjumps to the start of our program at x3000. Now you can see the 2instructions that constitute our program. You can see the ADD beingperformed, and then the machine gets halted again.

Continue running the increment-R2-into-R5 code until, if ever, you getbored. Then move on to Problem 1.

4b. Running Code..for a little while

Going one instruction at a time is great, but somewhat tedious. Weneed a happy medium between not knowing what's going on at all, andhaving to go through every single instruction, whether we care aboutit or not. Breakpoints are this happy medium.

A breakpoint is set at a particular memory location, and tells thesimulator to stop execution upon reaching that point. Memory locationswith breakpoints set on them show up in the simulator with a redsquare in the 'BP' column. It is left as an exercise to the reader todetermine what 'BP' stands for. You can set a breakpoint at a memorylocation with the command break set (memorylocation), or by checking the checkbox in the 'BP' column. Youcan get rid of a previously-set breakpoint with the command break clear (memory location), or byun-checking a previously checked box. You can also set and clearbreakpoints at labels, instead of specifying a hex memory location.

When you tell the simulator to continue,it will only run until it hits a breakpoint (or the system halts orhas an error). When you are writing and testing your answer forProblem 1, you can use the command breakpointset START to set a breakpoint at the beginning of yourcode. Then, you can use continue to skipall the OS code and get to the instructions you care about. Then youcan next over your code to make sure it'sdoing what you want it to do.

5. Running Scripts

Now try running some of the test scripts that we've provided forProblem 1. You can do this with the command script (scriptfile). LC-3 script files are .lcsfiles, but are really just plain text, and the file extension doesn'treally matter. Ways to cheat a slot machine. If you open the script file with a text editor, you cansee that the script commands are the same as those you type at thecommand line. For repetitive tasks, using a script file can save youtime, and perhaps the lifelong agony of RepetitiveStrain Injury.

Scripting is also a great way of testing your code. You can write afew test cases and check your code easily, especially for the problemsin this homework which are pretty easy to test. Use the check command to verify that a value is whatyou think it should be. We've distributed a few test scripts for theproblems in this homework, but they don't cover all the importantcases, so you should augment our scripts with some of your own.

6. General Help and Advice

This document doesn't cover all of the simulator's functionality; foran extended discussion of usage see the LC-3Simulator Manual. For quick help within the simulator itself,you can use the help command to see alist of all of the LC-3's commands. Use help(command) to get help on a specific command.

Many of the LC-3 commands have shortcuts - b is short for break, n fornext, and so forth. Use the help (or h)command to see what shortcuts exist.

The LC-3 Command Line has a history feature - use the up and downarrow keys to go backwards and forwards through the commands you'vepreviously entered.

If you resize the simulator window to make it bigger, the CommandlineOutput Pane will grow. If you have a small screen and the CommandlineOutput Pane still isn't big enough, you can open an external, resizableCommand Output Window by selecting the OpenCommand Output Window option from the File menu. This lets you see a lot more outputfrom the commands you run, and is particularly useful for viewing theerrors the assembler generates.

If you have trouble running the simulator, try checking the classforum in case someone else has had the same problem as you. Postingyour questions to the forum is a good idea in general, because thenother people can learn from your experience. The forum is checkedregularly by Professor Lewis and the TAs. Of course, you can alsoemail cse240@seas, or drop by office hours.

If you think you've found a bug in the simulator (which is,theoretically speaking, a possibility:), check the Simulator BugsPage to see if you've found a known bug with a workaround. Ifyou've found a new bug, post to the forums (if you want to embarrass us)or email cse240@seas (if you're feeling kinder). Be sure to include thefollowing:

1. A description of the bug.
2. What you were doing that caused the bug to occur.
3. What version of the simulator you were using. Find this via the simulator'sAbout menu.
4. What version of Java you were using. Find this by running java -version from the commandline of your OS.
5. What operating system you were using - Windows, Linux, Mac.

• Get the Flutter SDK
• iOS setup
• Android setup

System requirements

To install and run Flutter,your development environment must meet these minimum requirements:

• Operating Systems: macOS (64-bit)
• Disk Space: 2.8 GB (does not include disk space for IDE/tools).
• Tools: Flutter uses git for installation and upgrade. We recommendinstalling Xcode, which includes git, but you can also install git separately.

Important: If you're installing on a Mac with the latest Apple M1 processor, you may find these supplementary notes useful reading as we complete support for the new Apple Silicon architecture.

Get the Flutter SDK

1. Download the following installation bundle to get the lateststable release of the Flutter SDK:

   For other release channels, and older builds,see the SDK releases page.

2. Extract the file in the desired location, for example:

3. Add the flutter tool to your path:

   This command sets your PATH variable for thecurrent terminal window only.To permanently add Flutter to your path, seeUpdate your path.

You are now ready to run Flutter commands!

Note: To update an existing version of Flutter, see Upgrading Flutter.

Run flutter doctor

Run the following command to see if there are any dependencies you need toinstall to complete the setup (for verbose output, add the -v flag):

This command checks your environment and displays a report to the terminalwindow. The Dart SDK is bundled with Flutter; it is not necessary to installDart separately. Check the output carefully for other software you mightneed to install or further tasks to perform (shown in bold text).

For example:

The following sections describe how to perform these tasks and finish the setupprocess. Kronos free slots.

Once you have installed any missing dependencies, run the flutter doctorcommand again to verify that you've set everything up correctly.

Downloading straight from GitHub instead of using an archive

This is only suggested for advanced use cases.

You can also use git directly instead of downloading the prepared archive. For example,to download the stable branch:

Update your path, and run flutter doctor. That will let you know if there areother dependencies you need to install to use Flutter (e.g. the Android SDK).

If you did not use the archive, Flutter will download necessary development binaries as theyare needed (if you used the archive, they are included in the download). You may wish topre-download these development binaries (for example, you may wish to do this when settingup hermetic build environments, or if you only have intermittent network availability). Todo so, run the following command:

For additional download options, see flutter help precache.

Warning: The flutter tool uses Google Analytics to anonymously report feature usage statistics and basic crash reports. This data is used to help improve Flutter tools over time.

Flutter tool analytics are not sent on the very first run. To disable reporting, type flutter config --no-analytics. To display the current setting, type flutter config. If you opt out of analytics, an opt-out event is sent, and then no further information is sent by the Flutter tool.

By downloading the Flutter SDK, you agree to the Google Terms of Service. Note: The Google Privacy Policy describes how data is handled in this service.

Moreover, Flutter includes the Dart SDK, which may send usage metrics and crash reports to Google.

Update your path

You can update your PATH variable for the current session atthe command line, as shown in Get the Flutter SDK.You'll probably want to update this variable permanently,so you can run flutter commands in any terminal session.

The steps for modifying this variable permanently forall terminal sessions are machine-specific.Typically you add a line to a file that is executedwhenever you open a new window. For example:

1. Determine the path of your clone of the Flutter SDK.You need this in Step 3.
2. Open (or create) the rc file for your shell.Typing echo $SHELL in your Terminal tells youwhich shell you're using.If you're using Bash,edit $HOME/.bash_profile or $HOME/.bashrc.If you're using Z shell, edit $HOME/.zshrc.If you're using a different shell, the file pathand filename will be different on your machine.

3. Add the following line and change[PATH_OF_FLUTTER_GIT_DIRECTORY] to bethe path of your clone of the Flutter git repo:

4. Run source $HOME/.to refresh the current window,or open a new terminal window toautomatically source the file.

5. Verify that the flutter/bin directoryis now in your PATH by running:

   Verify that the flutter command is available by running:

Note: As of Flutter's 1.19.0 dev release, the Flutter SDK contains the dart command alongside the flutter command so that you can more easily run Dart command-line programs. Downloading the Flutter SDK also downloads the compatible version of Dart, but if you've downloaded the Dart SDK separately, make sure that the Flutter version of dart is first in your path, as the two versions might not be compatible. The following command tells you whether the flutter and dart commands originate from the same bin directory and are therefore compatible.

As shown above, the two commands don't come from the same bin directory. Update your path to use commands from /path-to-flutter-sdk/bin before commands from /usr/local/bin (in this case). After updating your shell for the change to take effect, running the which command again should show that the flutter and dart commands now come from the same directory.

To learn more about the dart command, run dart -h from the command line, or see the dart tool page.

Platform setup

macOS supports developing Flutter apps in iOS, Android,and the web (technical preview release).Complete at least one of the platform setup steps now,to be able to build and run your first Flutter app.

iOS setup

Install Xcode

To develop Flutter apps for iOS, you need a Mac with Xcode installed.

1. Install the latest stable version of Xcode(using web download or the Mac App Store).

2. Configure the Xcode command-line tools to use thenewly-installed version of Xcode byrunning the following from the command line:

   This is the correct path for most cases,when you want to use the latest version of Xcode.If you need to use a different version,specify that path instead.

3. Make sure the Xcode license agreement is signed byeither opening Xcode once and confirming or runningsudo xcodebuild -license from the command line.

Versions older than the latest stable version may still work,but are not recommended for Flutter development.Using old versions of Xcode to target bitcode is notsupported, and is likely not to work.

With Xcode, you'll be able to run Flutter apps onan iOS device or on the simulator.

Set up the iOS simulator

To prepare to run and test your Flutter app on the iOS simulator,follow these steps:

1. On your Mac, find the Simulator via Spotlight orby using the following command:

2. Make sure your simulator is using a 64-bit device(iPhone 5s or later) by checking the settings inthe simulator's Hardware > Device menu.
3. Depending on your development machine's screen size,simulated high-screen-density iOS devicesmight overflow your screen. Grab the corner of thesimulator and drag it to change the scale. You can alsouse the Window > Physical Size or Window > Pixel Accurateoptions if your computer's resolution is high enough.
   • If you are using a version of Xcode olderthan 9.1, you should instead set the device scalein the Window > Scale menu.

Create and run a simple Flutter app

To create your first Flutter app and test your setup,follow these steps:

1. Create a new Flutter app by running the following from thecommand line:

2. A my_app directory is created, containing Flutter's starter app.Enter this directory:

3. To launch the app in the Simulator,ensure that the Simulator is running and enter:

Deploy to iOS devices

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To deploy your Flutter app to a physical iOS deviceyou'll need to set up physical device deployment in Xcodeand an Apple Developer account. If your app is using Flutter plugins,you will also need the third-party CocoaPods dependency manager.

1. You can skip this step if your apps do not depend onFlutter plugins with native iOS code.Install and set up CocoaPods by running the following commands:

   Note: The default version of Ruby requires sudo to install the CocoaPods gem. If you are using a Ruby Version manager, you may need to run without sudo.

2. Follow the Xcode signing flow to provision your project:

   1. Open the default Xcode workspace in your project byrunning open ios/Runner.xcworkspace in a terminalwindow from your Flutter project directory.
   2. Select the device you intend to deploy to in the devicedrop-down menu next to the run button.
   3. Select the Runner project in the left navigation panel.

   4. In the Runner target settings page,make sure your Development Team is selectedunder Signing & Capabilities > Team.

      When you select a team,Xcode creates and downloads a Development Certificate,registers your device with your account,and creates and downloads a provisioning profile (if needed).

      • To start your first iOS development project,you might need to sign intoXcode with your Apple ID. Development and testing is supported for any Apple ID.Enrolling in the Apple Developer Program is required todistribute your app to the App Store.For details about membership types,see Choosing a Membership.

      • The first time you use an attached physical device for iOSdevelopment, you need to trust both your Mac and theDevelopment Certificate on that device.Select Trust in the dialog prompt whenfirst connecting the iOS device to your Mac.

        Then, go to the Settings app on the iOS device,select General > Device Managementand trust your Certificate.For first time users, you may need to selectGeneral > Profiles > Device Management instead.

      • If automatic signing fails in Xcode, verify that the project'sGeneral > Identity > Bundle Identifier value is unique.

3. Start your app by running flutter runor clicking the Run button in Xcode.

Android setup

Note: Flutter relies on a full installation of Android Studio to supply its Android platform dependencies. However, you can write your Flutter apps in a number of editors; a later step discusses that.

Install Android Studio

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1. Download and install Android Studio.
2. Start Android Studio, and go through the ‘Android Studio Setup Wizard'.This installs the latest Android SDK, Android SDK Command-line Tools,and Android SDK Build-Tools, which are required by Flutterwhen developing for Android.

Set up your Android device

To prepare to run and test your Flutter app on an Android device,you need an Android device running Android 4.1 (API level 16) or higher.

1. Enable Developer options and USB debugging on your device.Detailed instructions are available in theAndroid documentation.
2. Windows-only: Install the Google USBDriver.
3. Using a USB cable, plug your phone into your computer. If prompted on yourdevice, authorize your computer to access your device.
4. In the terminal, run the flutter devices command to verify thatFlutter recognizes your connected Android device. By default,Flutter uses the version of the Android SDK where your adbtool is based. If you want Flutter to use a different installationof the Android SDK, you must set the ANDROID_SDK_ROOT environmentvariable to that installation directory.

Set up the Android emulator

To prepare to run and test your Flutter app on the Android emulator,follow these steps:

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1. EnableVM accelerationon your machine.
2. Launch Android Studio, click the AVD Managericon, and select Create Virtual Device…
   • In older versions of Android Studio, you should insteadlaunch Android Studio > Tools > Android > AVD Manager and selectCreate Virtual Device…. (The Android submenu is only presentwhen inside an Android project.)
   • If you do not have a project open, you can choose Configure > AVD Manager and select Create Virtual Device…
3. Choose a device definition and select Next.
4. Select one or more system images for the Android versions you wantto emulate, and select Next.An x86 or x86_64 image is recommended.
5. Under Emulated Performance, select Hardware - GLES 2.0 to enablehardwareacceleration.

6. Verify the AVD configuration is correct, and select Finish.

   For details on the above steps, see ManagingAVDs.

7. In Android Virtual Device Manager, click Run in the toolbar.The emulator starts up and displays the default canvas for yourselected OS version and device.

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Web setup

Flutter has support for building web applications in thestable channel. Any app created in Flutter 2 automaticallybuilds for the web. To add web support to an existing app, followthe instructions on Building a web application with Flutter when you've completed the setup above.

Next step

Set up your preferred editor.