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emu.py
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emu.py
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import sys
from typing import Any
import numpy as np
mem = np.full(65536, 0, dtype=np.uint8)
regs = np.zeros(16, dtype=np.uint8)
ip = np.uint16(0)
sp = np.uint8(0x80)
ret_stack = []
flags = np.zeros(8, dtype=np.bool_)
ZF, CF, SF, OF = 0, 1, 2, 3
IN = open('in','rb')
OUT = open('out','wb')
def concat(bits1: np.uint8, bits2: np.uint8):
return (np.uint16(bits1) << 8) + np.uint16(bits2)
def set_flags(val1: np.uint8, val2: np.uint8):
res = np.int8(val1)-np.int8(val2)
flags[:4] = [res == 0, val1 < val2, res < 0, (res < 0 and np.int8(val1) > 0 and np.int8(val2) < 0) or (res > 0 and np.int8(val1) < 0 and np.int8(val2) > 0)]
def LD(rx, ry, rz):
regs[rz] = mem[concat(regs[rx], regs[ry])]
def ST(rx, ry, rz):
mem[concat(regs[rx], regs[ry])] = regs[rz]
def ADD(rx, ry):
regs[rx] += regs[ry]
def SUB(rx, ry):
regs[rx] -= regs[ry]
def MUL(rx, ry):
regs[rx] *= regs[ry]
def DIV(rx, ry):
regs[rx] //= regs[ry]
def MOD(rx, ry):
regs[rx] %= regs[ry]
def SHL(rx, ry):
regs[rx] <<= regs[ry]
def SHR(rx, ry):
regs[rx] >>= regs[ry]
def AND(rx, ry):
regs[rx] &= regs[ry]
def OR(rx, ry):
regs[rx] |= regs[ry]
def XOR(rx, ry):
regs[rx] ^= regs[ry]
def MOV(rx, ry):
regs[rx] = regs[ry]
def ADDI(rx, imm):
regs[rx] += imm
def SUBI(rx, imm):
regs[rx] -= imm
def MULI(rx, imm):
regs[rx] *= imm
def DIVI(rx, imm):
regs[rx] //= imm
def MODI(rx, imm):
regs[rx] %= imm
def SHLI(rx, imm):
regs[rx] <<= imm
def SHRI(rx, imm):
regs[rx] >>= imm
def ANDI(rx, imm):
regs[rx] &= imm
def ORI(rx, imm):
regs[rx] |= imm
def XORI(rx, imm):
regs[rx] ^= imm
def MOVI(rx, imm):
regs[rx] = imm
def CMP(rx, ry):
set_flags(regs[rx], regs[ry])
def CMPI(rx, imm):
set_flags(regs[rx], imm)
def JMP(addr):
global ip
ip = addr
def JE(addr):
if flags[ZF]:
JMP(addr)
def JNE(addr):
if not flags[ZF]:
JMP(addr)
def JL(addr):
if flags[SF] != flags[OF]:
JMP(addr)
def JG(addr):
if flags[SF] == flags[OF] and not flags[ZF]:
JMP(addr)
def CALL(addr):
global ret_stack, ip, sp
ret_stack.insert(0, ip)
assert (sp >= 2), "CPU crash, too many fn calls"
sp -= 2
ip = addr
def RET():
global ret_stack, ip, sp
ip = ret_stack[0]
ret_stack = ret_stack[1:]
sp += 2
def INPUT(rx):
global IN
regs[rx] = np.frombuffer(IN.read(1),np.uint8)
def OUTPUT(rx):
global OUT
OUT.write(regs[rx].tobytes())
def HALT(*args):
IN.close()
OUT.close()
print("Halting...")
print(
f"Machine State : {bytes(mem[:100])=} {regs=} {ip=} {sp=} {ret_stack=} {flags=}")
exit(0)
def process(instr, sz: int, args):
global ip
ip += sz
instr(*args)
def parse():
instr = HALT
sz: int = 0
args: list = []
op = mem[ip] >> 4
if (0 <= op <= 1):
sz = 2
args = [mem[ip] % 2**4, mem[ip+1] >> 4, mem[ip+1] % 2**4]
instr = [LD, ST][op]
if (op == 2):
func = mem[ip] % 2**4
sz = 2
args = [mem[ip+1] >> 4, mem[ip+1] % 2**4]
if (func == 0):
instr = ADD
elif (func == 1):
instr = SUB
elif (func == 2):
instr = MUL
elif (func == 3):
instr = DIV
elif (func == 4):
instr = MOD
elif (func == 5):
instr = SHL
elif (func == 6):
instr = SHR
elif (func == 7):
instr = AND
elif (func == 8):
instr = OR
elif (func == 9):
instr = XOR
elif (func == 10):
instr = MOV
elif (op == 3):
func = mem[ip] % 2**4
sz = 3
args = [mem[ip+1] >> 4, mem[ip+2]]
if (func == 0):
instr = ADDI
elif (func == 1):
instr = SUBI
elif (func == 2):
instr = MULI
elif (func == 3):
instr = DIVI
elif (func == 4):
instr = MODI
elif (func == 5):
instr = SHLI
elif (func == 6):
instr = SHRI
elif (func == 7):
instr = ANDI
elif (func == 8):
instr = ORI
elif (func == 9):
instr = XORI
elif (func == 10):
instr = MOVI
elif (op == 4):
sz = 2
args = [mem[ip] % 2**4, mem[ip+1]]
instr = CMP
elif (op == 5):
sz = 2
args = [mem[ip] % 2**4, mem[ip+1]]
instr = CMPI
elif (6 <= op <= 10):
sz = 3
args = [(np.uint16(mem[ip+1]) << 8) + np.uint16(mem[ip+2])]
instr = [JMP, JE, JNE, JL, JG][op-6]
elif (op == 11):
sz = 3
args = [concat(mem[ip+1], mem[ip+2])]
instr = CALL
elif (op == 12):
sz = 1
args = []
instr = RET
elif (op == 13):
sz = 1
args = [mem[ip]%2**4]
instr = INPUT
elif (op == 14):
sz = 1
args = [mem[ip]%2**4]
instr = OUTPUT
elif (op == 15):
sz = 1
args = []
instr = HALT
return instr, sz, args
def load(file: str):
with open(file, 'rb') as f:
b = f.read()
mem[:len(b)] = list(b)
load(sys.argv[1])
while (ip <= 0xFFFF):
instr, sz, args = parse()
print(
f"Executing instruction at {ip} : {instr.__name__},{args},{mem[ip:ip+sz]}")
process(instr, sz, args)