🏁 Flags are a bit more proper and added compare
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parent
d6cd7db0b8
commit
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2 changed files with 25 additions and 5 deletions
27
main.py
27
main.py
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@ -5,6 +5,8 @@
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# program execcution starts at 256
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# program execcution starts at 256
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#stack starts at end of memory FILO
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#stack starts at end of memory FILO
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#flags
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#nil nil nil nil nil nil negative zero
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import numpy as np
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import numpy as np
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import opcodes as ops
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import opcodes as ops
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@ -28,12 +30,11 @@ class ZombieCPU:
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self._regs.esp = self._memorysize - 1 #set stackpointer
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self._regs.esp = self._memorysize - 1 #set stackpointer
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self._regs.eip = 256 #set instructiojn pointer #fuck you thomas
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self._regs.eip = 256 #set instructiojn pointer #fuck you thomas
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print(self._regs.eip)
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def exec(self):
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def exec(self):
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Halted = False
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Halted = False
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while not Halted: #change this to if not halt
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while not Halted: #change this to if not halt
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#fetch
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#fetch
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opcode = self._memory[int(self._regs.eip)]
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opcode = self._memory[int(self._regs.eip)]
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address = self._memory[int(self._regs.eip + 1)]
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address = self._memory[int(self._regs.eip + 1)]
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value = self._memory[int(self._regs.eip + 2)]
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value = self._memory[int(self._regs.eip + 2)]
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@ -59,6 +60,13 @@ class ZombieCPU:
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self.write_memory(address, value)
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self.write_memory(address, value)
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if value == 0:
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if value == 0:
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self._regs.flags = self._regs.flags | 0b00000001
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self._regs.flags = self._regs.flags | 0b00000001
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else:
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print('unset flag here (you shouldnt be reading this!) (zero)')
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if value < 0:
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self._regs.flags = self._regs.flags | 0b00000010
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else:
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print('unset flag here (you shouldnt be reading this!) (neg)')
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elif opcode == ops.PUSH: #push
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elif opcode == ops.PUSH: #push
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self.write_memory(self._regs.esp, value) #put value onto stack
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self.write_memory(self._regs.esp, value) #put value onto stack
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@ -75,6 +83,13 @@ class ZombieCPU:
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if self._regs.flags & 0b00000001:
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if self._regs.flags & 0b00000001:
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self._regs.eip = address - 3
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self._regs.eip = address - 3
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elif opcode == ops.CMP:
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if address - value == 0:
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self._regs.flags = self._regs.flags | 0b00000001 #set zero flag
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else:
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print('unset flag here (you shouldnt be reading this!) (zero)')
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print(self._regs.flags)
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self._regs.eip += 3 #increment instruction pointer
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self._regs.eip += 3 #increment instruction pointer
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@ -86,6 +101,8 @@ class ZombieCPU:
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return self._memory
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return self._memory
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def read_memory_address(self, address):
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def read_memory_address(self, address):
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return self._memory[int(address)]
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return self._memory[int(address)]
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def read_flags(self, i):
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return self._regs
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if __name__ == "__main__":
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if __name__ == "__main__":
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cpu = ZombieCPU(65536, False)
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cpu = ZombieCPU(65536, False)
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@ -101,8 +118,10 @@ if __name__ == "__main__":
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cpu.write_memory(262, ops.POP) #pop
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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(263, 100) #into 100
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cpu.write_memory(264, 0) #unused in this op
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cpu.write_memory(264, 0) #unused in this op
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cpu.write_memory(265, ops.HLT) #jmp
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cpu.write_memory(265, ops.CMP)
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cpu.write_memory(266, 10)
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cpu.write_memory(267, 11) #should set the zero flag
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cpu.write_memory(268, ops.HLT)
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cpu.exec()
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cpu.exec()
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@ -6,4 +6,5 @@ LDI = 4 # Load Immediate
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PUSH = 5 # Push
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PUSH = 5 # Push
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POP = 6 # Pop
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POP = 6 # Pop
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JMP = 7 # Jump to address
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JMP = 7 # Jump to address
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JNZ = 8 # Jump to address if not zero
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JZ = 8 # Jump to address if zero
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CMP = 9 # Compare and set zero flag
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