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added instruction xor

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This commit is contained in:
Anton Lydike 2021-04-17 23:43:59 +02:00
parent 99de083894
commit f8e595b46e
2 changed files with 19 additions and 4 deletions
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18
riscemu/CPU.py
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@ -143,7 +143,14 @@ class CPU:
)
def instruction_sub(self, ins: 'LoadedInstruction'):
INS_NOT_IMPLEMENTED(ins)
ASSERT_LEN(ins.args, 3)
dst = ins.get_reg(0)
src1 = ins.get_reg(1)
src2 = ins.get_reg(2)
self.regs.set(
dst,
self.regs.get(src1) - self.regs.get(src2)
)
def instruction_lui(self, ins: 'LoadedInstruction'):
INS_NOT_IMPLEMENTED(ins)
@ -152,7 +159,14 @@ class CPU:
INS_NOT_IMPLEMENTED(ins)
def instruction_xor(self, ins: 'LoadedInstruction'):
INS_NOT_IMPLEMENTED(ins)
ASSERT_LEN(ins.args, 3)
dst = ins.get_reg(0)
src1 = ins.get_reg(1)
src2 = ins.get_reg(2)
self.regs.set(
dst,
self.regs.get(src1) ^ self.regs.get(src2)
)
def instruction_xori(self, ins: 'LoadedInstruction'):
INS_NOT_IMPLEMENTED(ins)

5
riscemu/helpers.py
View File

@ -44,13 +44,14 @@ def int_from_bytes(bytes, unsigned=False):
def to_unsigned(num: int, bytes=4):
if num < 0:
return 2**(bytes * 8) - num
return 2**(bytes * 8) + num
return num
def to_signed(num: int, bytes=4):
if num >> (bytes * 8 - 1):
return num - 2 ** (8 * bytes)
return num
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