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implemented instructions jal, jalr, j, ret, nop

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This commit is contained in:
Anton Lydike 2021-04-17 22:51:28 +02:00
parent 5a722c8cf1
commit 88c0b77a16
1 changed files with 16 additions and 4 deletions
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20
riscemu/CPU.py
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@ -207,13 +207,25 @@ class CPU:
INS_NOT_IMPLEMENTED(ins)
def instruction_jal(self, ins: 'LoadedInstruction'):
INS_NOT_IMPLEMENTED(ins)
reg = 'ra' # default register is ra
if len(ins.args) == 1:
addr = ins.get_imm(0)
else:
ASSERT_LEN(ins.args, 2)
reg = ins.get_reg(0)
addr = ins.get_imm(1)
self.regs.set(reg, self.pc)
self.pc = addr
def instruction_jalr(self, ins: 'LoadedInstruction'):
INS_NOT_IMPLEMENTED(ins)
ASSERT_LEN(ins.args, 2)
reg = ins.get_reg(0)
addr = ins.get_imm(1)
self.regs.set(reg, self.pc)
self.pc = addr
def instruction_ret(self, ins: 'LoadedInstruction'):
INS_NOT_IMPLEMENTED(ins)
self.pc = self.regs.get('ra')
def instruction_scall(self, ins: 'LoadedInstruction'):
ASSERT_LEN(ins.args, 0)
@ -224,7 +236,7 @@ class CPU:
INS_NOT_IMPLEMENTED(ins)
def instruction_nop(self, ins: 'LoadedInstruction'):
INS_NOT_IMPLEMENTED(ins)
pass
def instruction_dbg(self, ins: 'LoadedInstruction'):
if self.conf.debug_instruction: