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Test cases pass except for devices/65C02_extended_opcodes_test_modified.bin

This commit is contained in:
kris 2019-08-20 14:59:43 +01:00
parent 8b9cf7db69
commit 254b2fb167
3 changed files with 160 additions and 75 deletions

View File

@ -1,3 +1,5 @@
import sys
from py65.utils.conversions import itoa
from py65.utils.devices import make_instruction_decorator
from py65 import disassembler
@ -60,8 +62,9 @@ class MPU:
def step(self, trace=False):
instructCode = self.memory[self.pc]
if trace:
print self, "$%04X: %s" % (
out = str(self) + " $%04X: %s" % (
self.pc, self.disassembler.instruction_at(self.pc)[1])
print >> sys.stderr, "\n".join(out.split('\n'))
self.pc = (self.pc + 1) & self.addrMask
self.excycles = 0
self.addcycles = self.extracycles[instructCode]
@ -296,6 +299,9 @@ class MPU:
self.FlagsNZ(self.a)
def opADC(self, x):
return self._opADC(x, flags_use_adjusted_result=False)
def _opADC(self, x, flags_use_adjusted_result):
data = self.ByteAt(x())
if self.p & self.DECIMAL:
@ -315,24 +321,35 @@ class MPU:
# the ALU outputs are not decimally adjusted
nibble0 = nibble0 & 0xf
nibble1 = nibble1 & 0xf
aluresult = (nibble1 << 4) + nibble0
# the final A contents will be decimally adjusted
nibble0 = (nibble0 + adjust0) & 0xf
nibble1 = (nibble1 + adjust1) & 0xf
adjresult = (nibble1 << 4) + nibble0
# Update result for use in setting flags below
aluresult = (nibble1 << 4) + nibble0
self.p &= ~(self.CARRY | self.OVERFLOW | self.NEGATIVE | self.ZERO)
if aluresult == 0:
self.p |= self.ZERO
if flags_use_adjusted_result: # 65C02 and 65816
if adjresult == 0:
self.p |= self.ZERO
else:
self.p |= adjresult & self.NEGATIVE
if decimalcarry == 1:
self.p |= self.CARRY
if (~(self.a ^ data) & (self.a ^ aluresult)) & self.NEGATIVE:
self.p |= self.OVERFLOW
else:
self.p |= aluresult & self.NEGATIVE
if decimalcarry == 1:
self.p |= self.CARRY
if (~(self.a ^ data) & (self.a ^ aluresult)) & self.NEGATIVE:
self.p |= self.OVERFLOW
self.a = (nibble1 << 4) + nibble0
if aluresult == 0:
self.p |= self.ZERO
else:
self.p |= aluresult & self.NEGATIVE
if decimalcarry == 1:
self.p |= self.CARRY
if (~(self.a ^ data) & (self.a ^ aluresult)) & self.NEGATIVE:
self.p |= self.OVERFLOW
self.a = adjresult
else:
if self.p & self.CARRY:
tmp = 1
@ -395,59 +412,70 @@ class MPU:
self.p |= (register_value - tbyte) & self.NEGATIVE
def opSBC(self, x):
if self.p & self.DECIMAL:
self._opSBCDecimal(x)
return
data = self.ByteAt(x())
if self.p & self.DECIMAL:
halfcarry = 1
decimalcarry = 0
adjust0 = 0
adjust1 = 0
result = self.a + (~data & self.byteMask) + (self.p & self.CARRY)
self.p &= ~(self.CARRY | self.ZERO | self.OVERFLOW | self.NEGATIVE)
if ((self.a ^ data) & (self.a ^ result)) & self.NEGATIVE:
self.p |= self.OVERFLOW
data = result & self.byteMask
if data == 0:
self.p |= self.ZERO
if result > self.byteMask:
self.p |= self.CARRY
self.p |= data & self.NEGATIVE
self.a = data
nibble0 = (self.a & 0xf) + (~data & 0xf) + (self.p & self.CARRY)
if nibble0 <= 0xf:
halfcarry = 0
adjust0 = 10
nibble1 = ((self.a >> 4) & 0xf) + ((~data >> 4) & 0xf) + halfcarry
if nibble1 <= 0xf:
adjust1 = 10 << 4
def _opSBCDecimal(self, x):
"""SBC opcode in BCD mode.
# the ALU outputs are not decimally adjusted
aluresult = self.a + (~data & self.byteMask) + \
(self.p & self.CARRY)
This is sufficiently different on 6502 and 65C02 to warrant a separate
implementation, see e.g. http://6502.org/tutorials/decimal_mode.html#A
"""
data = self.ByteAt(x())
if aluresult > self.byteMask:
decimalcarry = 1
aluresult &= self.byteMask
halfcarry = 1
decimalcarry = 0
adjust0 = 0
adjust1 = 0
# but the final result will be adjusted
nibble0 = (aluresult + adjust0) & 0xf
nibble1 = ((aluresult + adjust1) >> 4) & 0xf
nibble0 = (self.a & 0xf) + (~data & 0xf) + (self.p & self.CARRY)
if nibble0 <= 0xf:
halfcarry = 0
adjust0 = 10
nibble1 = ((self.a >> 4) & 0xf) + ((~data >> 4) & 0xf) + halfcarry
if nibble1 <= 0xf:
adjust1 = 10 << 4
# Update result for use in setting flags below
aluresult = (nibble1 << 4) + nibble0
# the ALU outputs are not decimally adjusted
aluresult = self.a + (~data & self.byteMask) + \
(self.p & self.CARRY)
self.p &= ~(self.CARRY | self.ZERO | self.NEGATIVE | self.OVERFLOW)
if aluresult == 0:
self.p |= self.ZERO
else:
self.p |= aluresult & self.NEGATIVE
if decimalcarry == 1:
self.p |= self.CARRY
if ((self.a ^ data) & (self.a ^ aluresult)) & self.NEGATIVE:
self.p |= self.OVERFLOW
self.a = (nibble1 << 4) + nibble0
if aluresult > self.byteMask:
decimalcarry = 1
aluresult &= self.byteMask
# but the final result will be adjusted
nibble0 = (aluresult + adjust0) & 0xf
nibble1 = ((aluresult + adjust1) >> 4) & 0xf
# Update result for use in setting flags below
adjresult = (nibble1 << 4) + nibble0
self.p &= ~(self.CARRY | self.ZERO | self.NEGATIVE | self.OVERFLOW)
if aluresult == 0:
self.p |= self.ZERO
else:
result = self.a + (~data & self.byteMask) + (self.p & self.CARRY)
self.p &= ~(self.CARRY | self.ZERO | self.OVERFLOW | self.NEGATIVE)
if ((self.a ^ data) & (self.a ^ result)) & self.NEGATIVE:
self.p |= self.OVERFLOW
data = result & self.byteMask
if data == 0:
self.p |= self.ZERO
if result > self.byteMask:
self.p |= self.CARRY
self.p |= data & self.NEGATIVE
self.a = data
self.p |= aluresult & self.NEGATIVE
if decimalcarry == 1:
self.p |= self.CARRY
if ((self.a ^ data) & (self.a ^ aluresult)) & self.NEGATIVE:
self.p |= self.OVERFLOW
self.a = adjresult
def opDECR(self, x):
if x is None:

View File

@ -63,6 +63,77 @@ class MPU(mpu6502.MPU):
self.p |= self.ZERO
self.memory[address] = m & ~self.a
def opADC(self, x):
return self._opADC(x, flags_use_adjusted_result=True)
def _opSBCDecimal(self, x):
"""SBC opcode in binary mode (non-BCD)"""
data = self.ByteAt(x())
decimalcarry = 0
#adjust0 = 0
#adjust1 = 0
#nibble0 = (self.a & 0xf) + (~data & 0xf) + (self.p & self.CARRY)
#if nibble0 <= 0xf:
#halfcarry = 0
#adjust0 = 10 # 0xa = -0x6
#nibble1 = ((self.a >> 4) & 0xf) + ((~data >> 4) & 0xf) + halfcarry
#if nibble1 <= 0xf:
#adjust1 = 10 << 4 # -0x60
# the ALU outputs are not decimally adjusted
aluresult = self.a + (~data & self.byteMask) + \
(self.p & self.CARRY)
if aluresult > self.byteMask:
decimalcarry = 1
aluresult &= self.byteMask
#A2 = (self.a + ~data + (self.p & self.CARRY))
#print "A = %02X, %02X, A2 = %02X, a=%02X, data=%02X, alu=%02X" % (A, (A & self.byteMask), A2, self.a, data, aluresult)
#assert A == A2
# but the final result will be adjusted
#nibble0 = (aluresult + adjust0) & 0xf
#nibble1 = ((aluresult + adjust1) >> 4) & 0xf
# Update result for use in setting flags below
#adjresult = (nibble1 << 4) + nibble0
A = self.a - data + (self.p & self.CARRY) - 1
AL = (self.a & 0xf) - (data & 0xf) + (self.p & self.CARRY) - 1
assert (A & self.byteMask) == aluresult
# XXX
if A < 0:
#print A, A2
#assert adjust1, (A, adjust1)
A -= 0x60
if AL < 0:
#assert adjust0, (AL, adjust0)
A -= 0x6
#if (A & self.byteMask) != adjresult:
# print "a=%02X data=%02X carry=%02X, res=%02X, adj=%02X" % (
# self.a, data, self.p & self.CARRY, A & self.byteMask, adjresult)
#assert False
adjresult = A & self.byteMask
self.p &= ~(self.CARRY | self.ZERO | self.NEGATIVE | self.OVERFLOW)
if adjresult == 0:
self.p |= self.ZERO
else:
self.p |= adjresult & self.NEGATIVE
if decimalcarry == 1:
self.p |= self.CARRY
if ((self.a ^ data) & (self.a ^ aluresult)) & self.NEGATIVE:
self.p |= self.OVERFLOW
self.a = adjresult
# instructions
@instruction(name="BRK", mode="imp", cycles=7)

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@ -25,27 +25,13 @@ class KlausDormannTests(unittest.TestCase):
mpu, mpu.memory[0xb], mpu.memory[0xc], mpu.memory[0xd], mpu.memory[0xf])
def test6502FunctionalTest(self):
self.klausTestCase("6502_functional_test.bin", 0x0, 0x400, 0x3399)
self.klausTestCase("devices/6502_functional_test.bin", 0x0, 0x400, 0x3399)
def test65C02ExtendedOpcodesTest(self):
# XXX fails
def Xtest65C02ExtendedOpcodesTest(self):
tracer = lambda pc: (0x1484 <= pc <= 0x16cc)
self.klausTestCase("65C02_extended_opcodes_test_modified.bin", 0xa, 0x400, 0x24a8, tracer)
def test6502DecimalTest(self):
mpu = self._make_mpu()
mpu.pc = 0x1000
object_code = bytearray(open("6502_decimal_test.bin", "r").read())
self._write(mpu.memory, 0x200, object_code)
# $1000: JSR $0200
self._write(mpu.memory, 0x1000, [0x20, 0x00, 0x02])
while True:
mpu.step()
if mpu.pc == 0x1003:
break
assert mpu.memory[0x0b] == 0
self.klausTestCase("devices/65C02_extended_opcodes_test_modified.bin"
"", 0xa, 0x400, 0x24a8) #, tracer)
# Test Helpers