99 lines
2.5 KiB
Python
99 lines
2.5 KiB
Python
#made by zombie
|
|
#02/01/21
|
|
|
|
#0-255 is internal registers and flags and etc
|
|
# program execcution starts at 256
|
|
#stack starts at 65535 FILO
|
|
|
|
#0 IP #Instruction Pointer
|
|
#1 EAX
|
|
#2 EBX
|
|
#3 ECX
|
|
#4 EDX
|
|
#5 ESI
|
|
#6 EDI
|
|
#7 ESP #stack pointer
|
|
#8 EBP
|
|
#9 FLAG #Read-Only contains the flags
|
|
|
|
|
|
#list of opcodes
|
|
#0 interrupt
|
|
#1 reset
|
|
#2 debug info (nop)
|
|
#3 mov
|
|
|
|
|
|
import math
|
|
import numpy as np
|
|
|
|
|
|
|
|
|
|
|
|
class Zomcpu:
|
|
def __init__(self, memorysize=None, debug=None):
|
|
print('Processor Init')
|
|
self._memorysize = memorysize
|
|
self._memory = np.zeros(memorysize)
|
|
self._debug = debug
|
|
|
|
def reset(self):
|
|
print('Processor Resetting')
|
|
self._memory = np.zeros(self._memorysize) #clear memory
|
|
|
|
self._memory[7] = self._memorysize - 1 #set stackpointer
|
|
self._memory[0] = 256 #set instructiojn pointer
|
|
|
|
def exec(self):
|
|
Go = 1
|
|
while Go: #change this to if not halt
|
|
#fetch
|
|
opcode = self._memory[int(self._memory[0])]
|
|
address = self._memory[int(self._memory[0] + 1)]
|
|
value = self._memory[int(self._memory[0] + 2)]
|
|
|
|
if self._debug:
|
|
print(f'Opcode: {opcode}\nAddress: {address}\nValue: {value}\nIP: {self._memory[0]}')
|
|
|
|
if opcode == 0:
|
|
Go = value
|
|
if value == 0:
|
|
print('Processor Halted')
|
|
|
|
elif opcode == 1: #reset
|
|
self.reset()
|
|
|
|
elif opcode == 2: #debug (nop if debug is not set)
|
|
if self._debug:
|
|
print(f'Opcode: {opcode}\nAddress: {address}\nValue: {value}')
|
|
|
|
elif opcode == 3: #mov
|
|
self.write_memory(address, value)
|
|
|
|
self._memory[0] += 3 #increment instruction pointer
|
|
|
|
|
|
def set_memory(self, memory):
|
|
self._memory = memory
|
|
def write_memory(self, address, value):
|
|
self._memory[int(address)] = value
|
|
def read_memory(self):
|
|
return self._memory
|
|
def read_memory_address(self, address):
|
|
return self._memory[address]
|
|
|
|
|
|
if __name__ == "__main__":
|
|
cpu = Zomcpu(65536, True)
|
|
cpu.reset()
|
|
print(cpu.read_memory_address(7))
|
|
|
|
#hard coded opcodes
|
|
cpu.write_memory(256, 3)
|
|
cpu.write_memory(257, 27)
|
|
cpu.write_memory(258, 105)
|
|
print(cpu.read_memory_address(27))
|
|
cpu.exec()
|
|
print(cpu.read_memory_address(27))
|
|
|