A virtual machine written in Python that executes x86 binaries according to the Intel Software Developer Manual
PyVM is a virtual machine written in pure Python that runs Intel 8086/8088 machine code. No dependencies, no installation required.
You may want to run the tests first. To do this, execute from the command line:
cd path/to/PyVM
python unittest_basic.py
python unittest_VM.py
At the moment, PyVM can only execute flat binaries. You can assemble those with, for example, NASM:
nasm -f bin -o program.bin program.s
Then, execute the binary with PyVM:
import VM
vm = VM.VM(1024) # a virtual machine with 1024 bytes of memory; you may need to increase this value
vm.execute_file("path/to/program.bin") # this is what you've assembled at the previous step
If you decide to open an issue, please include a minimal, complete and verifiable example that reproduces the error and the traceback.
Not enough memory supplied -> increase the amount of memory given to the VM
Traceback (most recent call last):
File "...", line 53, in <module>
vm.execute_bytes(binary)
File ".../VM/fetchLoop.py", line ..., in execute_bytes
self.mem.set(offset, data)
File ".../VM/Memory.py", line ..., in set
assert offset + size in self.bounds
AssertionError
Unknown opcode -> please open an issue entitled Unknown opcode: [opcode in hex]
...
ValueError: Unknown opcode: 0xf8
The executable attempted to access a nonexistent memory location -> make sure your code absolutely cannot do this (that is, works fine after having been assembled, linked and run as a native executable), that there's enough memory supplied to the VM and open an issue entitled Invalid memory access.
...
assert offset + size in self.bounds
AssertionError
Other errors -> please open an issue entitled accordingly