COVM

A lightweight, stack-based and assembly-like x86/x64 VM.

Operators

1. NOP - An operator that does nothing.
2. ADD - Adds a number to a register
3. SUB - Subtracts a number inside a register
4. MUL - Multiplies a number inside a register with x
5. DIV - Divides a number inside a register with x
6. AND - Bitwise AND
7. XOR - Bitwise XOR
8. OR - Bitwise OR
9. NOT - Bitwise NOT
10. INC - Increases the number by one inside a register
11. DEC - Decreases the number by one inside a register
12. RET - Jumps to the end of the function
13. MOV - Moves data into a register
14. PUSH - Pushes data into the stack
15. POP - Removes data from the stack
16. LSTART - Defines the start of a function
17. LEND - Defines the end of a function
18. CALL - Calls a function by index
19. JMP - Jumps to an instruction
20. CMP - Compares register to any given data (register or hard-coded value)
21. JT - Jumps if the above check was true
22. JNT - Jumps if the above check was false

more will be added later.

Registers

Registers do not have a fixed size, but it is recommended to split them like the following:

• 16 bit-registers: AX, BX, CX, DX
• 32 bit-registers: EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI
• 64 bit-registers: RAX, RCX, RDX, RBX, RSP, RBP, RSI, RDI (R8, R9, ...)

Flags

Currently the COVM does not make use of flags, here are ones planned for the future usage:

1. CF
2. PF
3. AF
4. ZF
5. TF
6. IF
7. DF
8. OF
9. CTF

Compiling

To compile COVM you need Visual Studio.

License

COVM is licensed under GPLv2, which means you can freely distribute and/or modify the source of COVM.