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operations.py
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operations.py
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from registers import Registers
from utils import unpack_bytes, pack_bytes
import interrupts
from interrupts import Interrupts, codeToInt
codeToOperation = {
0x0: 'mov_reg_reg',
0x1: 'mov_reg_mem',
0x2: 'mov_mem_reg',
0x3: 'mov_reg_lit',
0x4: 'add_reg_reg',
0x5: 'add_reg_lit',
0x6: 'sub_reg_reg',
0x7: 'sub_reg_lit',
0x8: 'mul_reg_reg',
0x9: 'mul_reg_lit',
0xa: 'div_reg_reg',
0xb: 'div_reg_lit',
0x10: 'jmp_nz',
0xff: 'int'
}
operationToCode = {codeToOperation[x]: x for x in codeToOperation}
class Operations(object):
def __init__(self, program_scanner, memory,
registers):
self.program_scanner = program_scanner
self.memory = memory
self.registers = registers
self.interrupts = Interrupts(self.registers, self.memory)
def fromCode(self, code):
return getattr(self, codeToOperation[code])
def mov_reg_reg(self):
a = self.program_scanner.nextRegister()
b = self.program_scanner.nextRegister()
self.registers.set(a, self.registers.get(b))
def mov_reg_mem(self):
a = self.program_scanner.nextRegister()
b = self.program_scanner.nextMemory()
print(b)
b = self.memory[b:b + Registers.sizeOf(a)]
self.registers.set(a, pack_bytes(b))
def mov_mem_reg(self):
a = self.program_scanner.nextRegister()
b = self.program_scanner.nextBytes(2)
a = unpack_bytes(self.registers.get(a))
for byte in a:
self.memory[b] = byte
b += 1
def mov_reg_lit(self):
a = self.program_scanner.nextRegister()
b = self.program_scanner.nextBytes(Registers.sizeOf(a))
self.registers.set(a, b)
def add_reg_reg(self):
a = self.program_scanner.nextRegister()
b = self.program_scanner.nextRegister()
c = self.registers.get(a) + self.registers.get(b)
self.registers.set(a, c)
def sub_reg_reg(self):
a = self.program_scanner.nextRegister()
b = self.program_scanner.nextRegister()
c = self.registers.get(a) - self.registers.get(b)
self.registers.set(a, c)
def sub_reg_lit(self):
a = self.program_scanner.nextRegister()
b = self.program_scanner.nextBytes(Registers.sizeOf(a))
c = self.registers.get(a) - b
self.registers.set(a, c)
def mul_reg_reg(self):
a = self.program_scanner.nextRegister()
b = self.program_scanner.nextRegister()
c = self.registers.get(a) * self.registers.get(b)
self.registers.set(Registers.nextSize(a), c)
def jmp_nz(self):
a = self.program_scanner.nextMemory()
ax = self.registers.get('ax')
if ax != 0:
self.registers.pc = a
def int(self):
a = self.program_scanner.nextBytes(1)
getattr(self.interrupts, codeToInt[a])()