mirror of
https://github.com/lloeki/python-dcpu_16.git
synced 2025-12-06 09:54:39 +01:00
451 lines
10 KiB
Python
451 lines
10 KiB
Python
"""DCPU-16 implementation. (c) 2012, Loic Nageleisen
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Spec: http://0x10c.com/doc/dcpu-16.txt
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See LICENSE for licensing information.
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"""
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from __future__ import print_function, division
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# DCPU-16 spec version
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spec = '1.1'
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# log tool
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def log(string):
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print(" << %s" % string)
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# width constants
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w = 16
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wmask = 2**w - 1
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_opcode_map = {}
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class opcode(object):
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"""Opcode decorator"""
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def __init__(self, *opcode):
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self.opcode = opcode
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def __call__(self, f):
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_opcode_f = f
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_opcode_f.opcode = self.opcode
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if len(self.opcode) == 1:
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_opcode_map[self.opcode[0]] = _opcode_f
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else:
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if not self.opcode[0] in _opcode_map.keys():
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_opcode_map[self.opcode[0]] = {}
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_opcode_map[self.opcode[0]][self.opcode[1]] = _opcode_f
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return _opcode_f
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_valcode_map = {}
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class valcode(object):
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"""Valcode decorator"""
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def __init__(self, valcode):
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self.valcode = valcode
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def __call__(self, f):
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_valcode_f = f
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_valcode_f.valcode = self.valcode
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try:
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for code in self.valcode:
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# currify with (bound) code
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_valcode_map[code] = lambda c, code=code: _valcode_f(c, code)
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_valcode_map[code].__name__ = '%s(code=0x%02X)' % (_valcode_f.__name__, code)
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except TypeError:
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_valcode_map[self.valcode] = _valcode_f
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return _valcode_f
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class Register(object):
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"""Register descriptor"""
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def __init__(self, regcode=None):
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self.regcode = regcode
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def __get__(self, c, type=None):
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if self.regcode is not None:
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return c.r[self.regcode]
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else:
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return self.value
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def __set__(self, c, value):
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if self.regcode is not None:
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c.r[self.regcode] = value & wmask
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else:
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self.value = value & wmask
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def make_pointer(c, codestr):
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"""creates a pointer func that evaluates codestr"""
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def getter(c=c):
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return eval("%s" % codestr)
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def setter(data, c=c):
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exec("%s = %r" % (codestr, data)) in {}, {'c': c, 'data': data}
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pointer = getter
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pointer.codestr = codestr
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pointer.set = setter
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return pointer
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def pointerize(f):
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"""wraps a function that generates a codestr to create a pointer"""
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if f.func_code.co_argcount == 1:
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ptrz = lambda c: make_pointer(c, f(c))
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elif f.func_code.co_argcount == 2:
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ptrz = lambda c, code: make_pointer(c, f(c, code))
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else:
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raise Exception('%s has too many arguments' % f.__name__)
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ptrz.__name__ = 'ptr_to_%s' % f.__name__
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ptrz.__doc__ = f.__doc__
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return ptrz
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@opcode(0x0, 0x01)
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def JSR(c, a):
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"""pushes the address of the next instruction to the stack, then sets PC to a"""
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c.sp -= 1
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c.m[c.sp] = c.pc
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c.pc = a()
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@opcode(0x1)
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def SET(c, a, b):
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"""sets a to b"""
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a.set(b())
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@opcode(0x2)
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def ADD(c, a, b):
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"""sets a to a+b, sets O to 0x0001 if there's an overflow"""
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res = (a() + b())
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if res > wmask:
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c.o = 0x0001
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res = res & wmask
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a.set(res)
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@opcode(0x3)
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def SUB(c, a, b):
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"""sets a to a-b, sets O to 0xFFFF if there's an underflow"""
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res = (a() - b())
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if res & (wmask+1):
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c.o = 0xFFFF
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res = res & wmask
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a.set(res)
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@opcode(0x4)
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def MUL(c, a, b):
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"""sets a to a*b, sets O to ((a*b)>>16)&0xFFFF"""
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res = (a() * b())
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c.o = ((a() * b()) >> w) & wmask
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res = res & wmask
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a.set(res)
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@opcode(0x5)
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def DIV(c, a, b):
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"""sets a to a/b, sets O to ((a<<16)/b)&0xFFFF"""
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res = a() // b()
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c.o = ((a() << w) // b()) & wmask
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a.set(res)
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@opcode(0x6)
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def MOD(c, a, b):
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"""sets a to a%b. if b==0, sets a to 0 instead"""
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if b()==0:
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res = 0
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else:
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res = a() % b()
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a.set(res)
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@opcode(0x7)
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def SHL(c, a, b):
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"""sets a to a<<b. sets O to ((a<<b)>>16)&0xFFFF"""
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res = (a() << b())
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c.o = ((a() << b()) >> w) & wmask
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res = res & wmask
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a.set(res)
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@opcode(0x8)
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def SHR(c, a, b):
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"""sets a to a>>b. sets O to ((a>>16)>>b)&0xFFFF"""
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res = (a() >> b())
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c.o = ((a() >> w) >> b()) & wmask
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res = res & wmask
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a.set(res)
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@opcode(0x9)
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def AND(c, a, b):
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"""sets a to a&b"""
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res = a() & b()
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a.set(res)
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@opcode(0xA)
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def BOR(c, a, b):
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"""sets a to a|b"""
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res = a() | b()
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a.set(res)
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@opcode(0xB)
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def XOR(c, a, b):
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"""sets a to a^b"""
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res = a() ^ b()
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a.set(res)
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@opcode(0xC)
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def IFE(c, a, b):
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"""performs next instruction only if a==b"""
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if a() == b():
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c.skip = False
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else:
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c.skip = True
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@opcode(0xD)
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def IFN(c, a, b):
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"""performs next instruction only if a!=b"""
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if a() != b():
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c.skip = False
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else:
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c.skip = True
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@opcode(0xE)
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def IFG(c, a, b):
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"""performs next instruction only if a>b"""
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if a() > b():
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c.skip = False
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else:
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c.skip = True
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@opcode(0xF)
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def IFB(c, a, b):
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"""performs next instruction only if (a&b)!=0"""
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if (a() & b()) != 0:
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c.skip = False
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else:
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c.skip = True
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@valcode(range(0x00, 0x08))
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@pointerize
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def register(c, code):
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"""register"""
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v = "c.r[0x%01X]" % code
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return v
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@valcode(range(0x08, 0x10))
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@pointerize
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def register_value(c, code):
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"""[register]"""
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v = "c.m[c.r[0x%01X]]" % (code-0x07)
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return v
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@valcode(range(0x10, 0x18))
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@pointerize
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def next_word_plus_register_value(c, code):
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"""[next word + register]"""
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v = "c.m[0x%04X + c.r[0x%01X]]" % (c.m[c.pc], code-0x0F)
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c.pc += 1
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return v
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@valcode(0x18)
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@pointerize
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def pop(c):
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"""POP / [SP++]"""
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v = "c.m[0x%04X]" % c.sp
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c.sp += 1
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return v
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@valcode(0x19)
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@pointerize
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def peek(c):
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"""PEEK / [SP]"""
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v = "c.m[0x%04X]" % c.sp
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return v
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@valcode(0x1A)
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@pointerize
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def push(c):
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"""PUSH / [--SP]"""
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c.sp -= 1
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v = "c.m[0x%04X]" % c.sp
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return v
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@valcode(0x1B)
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@pointerize
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def stack_pointer(c):
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"""stack pointer"""
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v = "c.sp"
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return v
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@valcode(0x1C)
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@pointerize
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def program_counter(c):
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"""program counter"""
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v = "c.pc"
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return v
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@valcode(0x1D)
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@pointerize
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def overflow(c):
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"""overflow"""
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v = "c.o"
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return v
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@valcode(0x1E)
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@pointerize
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def next_word_value(c):
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"""[next_word]"""
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v = "c.m[0x%04X]" % c.m[c.pc]
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c.pc += 1
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return v
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@valcode(0x1F)
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@pointerize
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def next_word(c):
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"""next_word (literal)"""
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v = "c.m[0x%04X]" % c.pc
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c.pc += 1
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return v
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@valcode(range(0x20, 0x40))
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@pointerize
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def literal(c, code):
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"""literal value 0x00-0x1F (literal)"""
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v = "0x%04X" % (code - 0x20)
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return v
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class Memory(object):
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"""array of 16-bit words"""
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def __init__(m, debug=False):
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m.clear()
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def clear(m):
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"""clear memory"""
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# TODO: (addr, len) memory range to clear
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m.w = [0 for _ in xrange(0, 2**w)]
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def __getitem__(m, addr):
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"""get word at addr"""
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return m.w[addr]
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def __setitem__(m, addr, value):
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"""assignment truncates values to 16-bit words"""
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# TODO: multi-word assignment starting at addr when value is list
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m.w[addr] = value & wmask
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class CPU(object):
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"""DCPU-16"""
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def __init__(c, memory=Memory(), debug=False):
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"""If you don't specify memory, CPUs will share the same, default memory object"""
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c.m = memory
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c.clear()
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c.reset()
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c.debug = debug
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def reset(c):
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"""reset CPU"""
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c.r = [0 for _ in xrange(0, 8)]
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c.pc = 0x0000
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c.sp = 0x0000
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c.o = 0x0000
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c.skip = False
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def clear(c):
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"""clear memory"""
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c.m.clear()
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a = Register(0x0)
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b = Register(0x1)
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c = Register(0x2)
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x = Register(0x3)
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y = Register(0x4)
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z = Register(0x5)
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i = Register(0x6)
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j = Register(0x7)
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pc = Register()
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sp = Register()
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o = Register()
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def _op(c, word):
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"""dispatch word to op and args"""
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opcode = word & 0xF
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a_code = word >> 4 & 0x3F
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b_code = word >> 10 & 0x3F
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try:
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op = _opcode_map[opcode]
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try:
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op = op[a_code]
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except TypeError:
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args = (c._pointer(a_code),
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c._pointer(b_code))
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else:
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args = (c._pointer(b_code),)
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finally:
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if c.debug:
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log(' '.join([op.__name__] + [arg.codestr for arg in args]))
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except KeyError:
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raise Exception('Invalid opcode %s at PC=%04X' % (["%02X"%x for x in opcode], c.pc))
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return op, args
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def _pointer(c, code):
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"""get pointer to valcode"""
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try:
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return _valcode_map[code](c)
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except KeyError:
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raise Exception("Invalid valcode")
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def __getitem__(c, code):
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"""get value of valcode"""
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return c._pointer(code)()
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def __setitem__(c, code, value):
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"""set value at valcode"""
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c._pointer(code).set(value)
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def step(c):
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"""start handling [PC]"""
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word = c.m[c.pc]
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c.pc += 1
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op, args = c._op(word)
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if c.skip:
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c.skip = False
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if c.debug: log("Skipped")
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else:
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op(c, *args)
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if c.debug: log(c.dump_r())
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def run(c):
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"""step until PC is constant"""
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last_pc = 0xFFFF
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while c.pc != last_pc:
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last_pc = c.pc
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c.step()
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log("Infinite loop")
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def dump_r(c):
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"""human-readable register status"""
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return " ".join( "%s=%04X" %
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(["A", "B", "C",
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"X", "Y", "Z",
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"I", "J",
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"PC", "SP", "O",
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][i],
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(c.r + [c.pc, c.sp, c.o])[i])
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for i in range(11))
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def load_m(c, data=None, io=None):
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"""load data in memory"""
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# TODO: load from io object
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for i in xrange(len(data)):
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c.m[i] = data[i]
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def dump_m(c, io):
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"""dump memory data"""
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# TODO: save to io object
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pass
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spec_demo = [
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0x7c01, 0x0030, 0x7de1, 0x1000, 0x0020, 0x7803, 0x1000, 0xc00d,
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0x7dc1, 0x001a, 0xa861, 0x7c01, 0x2000, 0x2161, 0x2000, 0x8463,
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0x806d, 0x7dc1, 0x000d, 0x9031, 0x7c10, 0x0018, 0x7dc1, 0x001a,
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0x9037, 0x61c1, 0x7dc1, 0x001a, 0x0000, 0x0000, 0x0000, 0x0000,
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]
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