A bytecode vm written in python.

Last update: Aug 26, 2022

Related tags

Code Analysis CHex

Overview

CHex

A bytecode vm written in python.

hex command meaning

note: the first two hex values of a CHex program are the magic number

0x01 (offset in memory in hex)

Print the ascii hex character stored in memory at the offset given.

0x02 (program offset to jump to)

Equivelent of jump command in asm.

0x03 (offset in memory to store value at) (hex value to store(can be ascii hex))

Store a value in memory at the given offset.

0x04 (offset in memory to get program offset from)

Jump to a program offset stored in memory.

0x05 (memory offset 1) (memory offset 2) (program offset to jump to)

Jump to given program offset if two values in memory are equal.

Machine code can be written in a hex editor that is compatible with this.

If you would like to see some code I have already written please check the example binary.

What it simulates

It inits the memory.
It inits the only register the cpu has. (offset)
It loads the first two bytes of the program file and checks if they say "hi" in ascii. If not true it turns off.
It sets offset to 0x02
It gets the command at the location of offset and runs it.
It sets offset to the next command
Goes back to step 5 and repeats ntil the program ends.

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A bytecode vm written in python.

Related tags

Overview

CHex

hex command meaning

0x01 (offset in memory in hex)

0x02 (program offset to jump to)

0x03 (offset in memory to store value at) (hex value to store(can be ascii hex))

0x04 (offset in memory to get program offset from)

0x05 (memory offset 1) (memory offset 2) (program offset to jump to)

Machine code can be written in a hex editor that is compatible with this.

What it simulates

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