asim

ASim Demo

To run a demo, click one of

• Asim demo
• Educore demo
• Educore_piplined demo

or follow the instructions below to run everything locally on your machine.

• clone this repo and make the top level of the repo your current working directory.

• make server to start a local server (requires python3)

• Browse to http://localhost:8000/asim.html. This loads a webpage that makes an instance of the ASim tool then loads an example assembly language program. Please see the screenshot at the bottom of this page. Use http://localhost:8000/educore.html or http://localhost:8000/educore_pipelined.html for the Educore versions of the demo.

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The toolbar at the top of the editor pane includes the following controls:

Control	Description
	Click button to run the built-in assembler on the currently selected editor buffer. Assembly errors will be shown above the buffer, each with a link you can click to take you to the offending line.
	Use this drop-down list to select one of the loaded files for editing.
	Use one of these three buttons to create a new editor buffer, upload a file from from your computer into a new editor buffer, or download the currently selected editor buffer to your computer. Note that you can edit the name of buffer by clicking on the buffer name and making the edits there.
	Use these controls to decrease or increase the font size in the editor buffers, or to change the key mapping used by the CodeMirror editor.

Once the browser is displaying the ASim tool and you’ve selected the desired editor buffer, you can click Assemble. This will open the simulation pane to the right of the editor pane. The simulation pane has execution controls at the top and several subpanes showing the state of the simulated processor. You can click and drag the vertical divider between the editor and simulation panes to adjust the layout.

Here are the simulation controls:

Control	Description
Reset	reset the simulation to its initial state.
Step	execute the next (highlighted) instruction. The state displays are updated to reflect any changes made by the executed instruction. Reads and writes are indicated by highlighting the appropriate register and/or memory location.
Walk	execute many steps sequentially, with a state update after each step. Once started, the button changes to “Stop”, which you can click to stop the simulation. The simulation will also halt when it reaches a user breakpoint, a HLT, BRK, or YIELD instruction, or when the simulator detects that the PC hasn’t changed after executing an instruction (i.e., an instruction like “b .” that branches to itself).
Run	like Walk but don’t update state display after each instruction. Once started, the button changes to “Stop”, which you can click to stop the simulation. This is much faster with simulation rates of multiple MIPS on my relatively new iMac.

You can set a user breakpoint by clicking in the editor window to the right of the line number. Breakpoint locations are shown with a small red circle. Clicking on the red circle will remove the breakpoint. Execution will pause at the first instruction on (or after) this line.

ASim Screenshot:

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