def push2(self, value):
"""
Pushes an unsigned word, *value*, to the stack. Raises an
:class:`OverflowError` if *value* is not an unsigned word. Raises a
:class:`StackError` on a stack overflow.
"""
self._push(vm.hb(value), STACK_ADDRESS)
self._push(vm.lb(value), STACK_ADDRESS)
def test_txtrst(self):
suite.banner(self.test_txtrst)
a = self.a
_; a.macro (ldxy_imm, x16(0xffff))
_; a.macro (stxy_zp, 'TEXT_WORK_PTR')
_; a(jsr, 'TXTRST')
_; a.macro (ldxy_zp, 'TEXT_WORK_PTR')
self.run_test()
self.assertEquals(vm.lb(memmap.TEXT_WORK), self.cpu.x)
self.assertEquals(vm.hb(memmap.TEXT_WORK), self.cpu.y)
def test_findmsg_last(self):
suite.banner(self.test_findmsg_last)
a = self.a
_; a.macro (ldxy_imm, 'test.table')
_; a(lda_imm, 2)
_; a(jsr, 'FINDMSG')
_; a(brk)
_; a(nop)
_; a('test.table')
_; a.data ('000000', 0)
_; a.data ('000000', 0)
_; a('answer')
_; a.data ('123456', 0)
self.run_test()
ptr = self.meta.lookup('answer')
self.assertEquals(vm.lb(ptr), self.cpu.x)
self.assertEquals(vm.hb(ptr), self.cpu.y)
def next(self):
"""
Description
"""
d = Disassembled()
d.address = vm.size16(self.position)
d.labels = self.meta.get_labels(d.address)
d.remarks = self.meta.get_remarks(d.address)
d.argument = self.meta.get_argument(d.address)
d.data = self.meta.get_data(d.address)
if d.data is not None:
self.position = d.data.address + d.data.length
return d
opcode = self.pc.load()
if opcode in self._opcodes:
i = self._opcodes[opcode]
else:
op = '?{:02X}'.format(opcode)
i = x6502.Instruction(opcode, op, am.IMP, None)
d.instruction = i
if i.addressing_mode in AM_ADDRESS_16:
arg = self.pc.load2()
d.bytes = [opcode, vm.lb(arg), vm.hb(arg)]
elif (i.addressing_mode in AM_ADDRESS_8 or
i.addressing_mode in (am.REL, am.IMM)):
arg = self.pc.load()
if i.addressing_mode == am.REL and d.argument is None:
# Branch is displacement after consuming bytes, therefore
# add two.
d.argument = vm.hex16(d.address + vm.twos_inverse(arg) + 2)
d.bytes = [opcode, arg]
elif i.addressing_mode in AM_NO_ARGUMENT:
d.bytes = [opcode]
else:
assert False
return d
def test_lb(self):
self.assertEquals(0x34, vm.lb(0x1234))
