def test_op_add(self):
"""
Tests ADD op code
[dst]:=[a]+[b]
"""
e = ElfCPU()
# Invalid address 44 for a
e.load_string('1,44,0,0')
with self.assertRaises(ProtectionFaultError):
e.step()
# Invalid address 44 for b
e.load_string('1,0,44,0')
with self.assertRaises(ProtectionFaultError):
e.step()
# Invalid address 44 for dst
e.load_string('1,0,0,44')
with self.assertRaises(ProtectionFaultError):
e.step()
# 1 + 1 = 2 @ address 0
e.load_string('1,0,0,0,99')
e.step()
self.assertEqual(e.peek(0), 2)
# 2**64 + 1 = 1 @ address 0 (overflow and wrap)
e.load_string('1,5,6,0,99,' + str(2**64) + ',1')
e.step()
self.assertEqual(e.peek(0), 1)
def test_op_mul(self):
"""
Tests MUL op code
[dst]:=[a]*[b]
"""
e = ElfCPU()
# Invalid address 44 for a
e.load_string('2,44,0,0')
with self.assertRaises(ProtectionFaultError):
e.step()
# Invalid address 44 for b
e.load_string('2,0,44,0')
with self.assertRaises(ProtectionFaultError):
e.step()
# Invalid address 44 for dst
e.load_string('2,0,0,44')
with self.assertRaises(ProtectionFaultError):
e.step()
# 2 * 2 = 4 @ address 0
e.load_string('2,0,0,0,99')
e.step()
self.assertEqual(e.peek(0), 4)
# 2**63 * 3 = 9223372036854775808 @ address 0 (overflow and wrap)
e.load_string('2,5,6,0,99,' + str(2**63) + ',3')
e.step()
self.assertEqual(e.peek(0), 9223372036854775808)
def test_halt(self):
"""
Tests for the halt op code
"""
e = ElfCPU()
e.load_string('1,0,0,0,99')
e.step()
self.assertFalse(e.is_halted)
e.step()
self.assertTrue(e.is_halted)