https://github.com/devincarr/sim

A simple VM created in Rust
https://github.com/devincarr/sim

Last synced: about 2 months ago
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A simple VM created in Rust

• Host: GitHub
• URL: https://github.com/devincarr/sim
• Owner: DevinCarr
• Created: 2015-06-23T21:33:54.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2016-05-04T04:30:39.000Z (over 8 years ago)
• Last Synced: 2023-08-01T08:28:41.886Z (over 1 year ago)
• Language: Rust
• Size: 4.88 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
Sim

=======

A very simple virtual machine based on [this](https://blog.felixangell.com/virtual-machine-in-c/), but written in rust instead. This also acts as a beginner project in rust.

## Current ISA

Instruction      | Machine code  | Description

-----------------|---------------|------------

halt             | 0             | Halt the program

pushi `$im`      | 1,`i32`       | Push the immediate (`$im`) onto the stack

pushr `$im`      | 2,`i32`       | Push a register (location `$im`) onto the stack

pop              | 3             | Pop the top of the stack

add `src`,`dest` | 4,`i32`,`i32` | Add the `src` and `dest` registers and put back into `dest`

movi `$im`,`dest`| 5,`i32`,`i32` | Move the `$im` into the register at `dest`

movr `src`,`dest`| 6,`i32`,`i32` | Move the value from `src` to `dest`

log              | 7             | Print out the current stack

#### Memory:

Stack size: `16`

Registers:

Register | Value

---------|-------

eax      | 0

ebx      | 1

ecx      | 2

edx      | 3

# Running

*See prog.si for example format*

`$ sim < prog.si`