A simple RISC-based virtual machine written in Rust.

Labels

Any line can be prefixed with an identifier and used as a reference point in other instructions.

Instructions

Directives

.byte: Store an ASCII value as a byte of data

Example

.byte 'A' 

.word: Store a signed integer as a word of data

Example

.word 10

Jumps

JMP: Jump to a label

Example

JMP label

JMR: Jump to an address stored in a register

Example

JMR reg_1

!0: Jump to a label if the value stored in a register is not 0

Example

!0  reg_1 label

>0: Jump to a label if the value stored in a register is greater than 0

Example

>0  reg_1 label

<0: Jump to a label if the value stored in a register is greater than 0

Example

<0  reg_1 label

=0: Jump to a label if the value stored in a register is equal to 0

Example

=0  reg_1 label

Moves

MOV: Copy data from the second register into the first register

Example

MOV reg_1 reg_2

LDA: Load the address of a label into a register

Example

LDA reg_1 label

STW: Store a word of data at a label

Example

STW reg_1 label

LDW: Loads a word of data from a label into a register

Example

LDW reg_1 label

STB: Store a byte of data at a label

Example

STB reg_1 label

LDB: Load a byte of data from a label

Example

LDB reg_1 label