123 lines
3.6 KiB
Python
123 lines
3.6 KiB
Python
#made by zombie
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#02/01/21
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#0-255 is internal registers and flags and etc
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# program execcution starts at 256
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#stack starts at 65535 FILO
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#0 IP #Instruction Pointer
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#1 EAX
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#2 EBX
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#3 ECX
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#4 EDX
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#5 ESI
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#6 EDI
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#7 ESP #stack pointer
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#8 EBP
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#9 FLAG #Read-Only contains the flags
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#list of opcodes
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#0 interrupt
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#1 reset
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#2 debug info (nop)
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#3 mov
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#4 push (onto stack)
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#5 pop (off of stack into address)
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import math
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import numpy as np
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import opcodes as ops
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np.set_printoptions(threshold=np.inf)
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class Zomcpu:
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def __init__(self, memorysize=None, debug=None):
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print('Processor Init')
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self._memorysize = memorysize
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self._memory = np.zeros(memorysize)
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self._debug = debug
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def reset(self):
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print('Processor Resetting')
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self._memory = np.zeros(self._memorysize) #clear memory
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self._memory[7] = self._memorysize - 1 #set stackpointer
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self._memory[0] = 256 #set instructiojn pointer
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def exec(self):
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Halted = False
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while not Halted: #change this to if not halt
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#fetch
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opcode = self._memory[int(self._memory[0])]
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address = self._memory[int(self._memory[0] + 1)]
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value = self._memory[int(self._memory[0] + 2)]
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if self._debug:
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print(f'Opcode: {opcode}\nAddress: {address}\nValue: {value}\nIP: {self._memory[0]}')
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if opcode == ops.NOP:
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pass
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elif opcode == ops.HLT:
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Halted = True
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print('Processor Halted')
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elif opcode == ops.RST: #reset
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self.reset()
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elif opcode == ops.DBG: #debug enable
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self._debug = value
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elif opcode == ops.LDI: #mov but actually load immediate
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self.write_memory(address, value)
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elif opcode == ops.PUSH: #push
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self.write_memory(self._memory[7], value) #put value onto stack
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self.write_memory(7, self._memory[7] - 1) #dec stackpointer
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elif opcode == ops.POP: #pop
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self.write_memory(address, self.read_memory_address(self._memory[7] + 1)) #read the last value and put it into address (not the empty space)
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self.write_memory(7, self._memory[7] + 1) #inc stackpointer
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self._memory[0] += 3 #increment instruction pointer
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def set_memory(self, memory):
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self._memory = memory
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def write_memory(self, address, value):
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self._memory[int(address)] = value
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def read_memory(self):
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return self._memory
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def read_memory_address(self, address):
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return self._memory[int(address)]
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if __name__ == "__main__":
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cpu = Zomcpu(65536, True)
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cpu.reset()
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#hard coded opcodes
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cpu.write_memory(256, ops.LDI) #mov
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cpu.write_memory(257, 27) #address 27
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cpu.write_memory(258, 105) #105 into ^
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cpu.write_memory(259, ops.PUSH) #push
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cpu.write_memory(260, 0) #unused in this op
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cpu.write_memory(261, 27) #the value at address 27 onto the stack
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cpu.write_memory(262, ops.POP) #pop
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cpu.write_memory(263, 100) #into 100
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cpu.write_memory(264, 0) #unused in this op
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cpu.write_memory(265, 1) #halt
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cpu.exec()
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print(cpu.read_memory_address(100))
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print(cpu.read_memory_address(264))
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print(cpu.read_memory_address(7))
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#c = Console(cpu.read_memory()) ima finish this later
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#c.draw()
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