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isa.py
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from enum import Enum
from ctypes import *
import logging
class Instructions(Enum):
lui=0
auipc=1
jal=2
jalr=3
beq=4
bne=5
blt=6
bge=7
bltu=8
bgeu=9
lb=10
lh=11
lw=12
lbu=13
lhu=14
sb=15
sh=16
sw=17
addi=18
slti=19
sltiu=20
xori=21
ori=22
andi=23
slli=24
srli=25
srai=26
add=27
sub=28
sll=29
slt=30
sltu=31
xor=33
srl=34
sra=35
zor=36
zand=37
ecall=38
ebreak=39
csrrw=40
csrrs=41
csrrc=42
csrwi=43
csrrsi=44
csrrci=45
noimp=99
class Isa():
def __init__(self):
self.func7MAPecall={ #ecall not implemented..Will be treated as ebreaks
0b00000000:Instructions.ebreak
}
self.func7MAPshfti={
0b00000000:Instructions.srli,
0b00100000:Instructions.srai
}
self.func7MAPshft={
0b00000000:Instructions.srl,
0b00100000:Instructions.sra
}
self.func7MAPaddsub={
0b00000000:Instructions.add,
0b00100000:Instructions.sub
}
self.func3MAPB={
0b00000000:Instructions.beq,
0b00000001:Instructions.bne,
0b00000100:Instructions.blt,
0b00000101:Instructions.bge,
0b00000110:Instructions.bltu,
0b00000111:Instructions.bgeu
}
self.func3MAPS={
0b00000000:Instructions.sb,
0b00000001:Instructions.sh,
0b00000010:Instructions.sw
}
self.func3MAPI1={
0b00000000:Instructions.lb,
0b00000001:Instructions.lh,
0b00000010:Instructions.lw,
0b00000100:Instructions.lbu,
0b00000101:Instructions.lhu
}
self.func3MAPI2={
0b00000000:Instructions.addi,
0b00000001:Instructions.slli,
0b00000010:Instructions.slti,
0b00000011:Instructions.sltiu,
0b00000100:Instructions.xori,
0b00000101:self.func7MAPshfti,
0b00000110:Instructions.ori,
0b00000111:Instructions.andi
}
self.func3MAPR={
0b00000000:self.func7MAPaddsub,
0b00000001:Instructions.sll,
0b00000010:Instructions.slt,
0b00000011:Instructions.sltu,
0b00000100:Instructions.xor,
0b00000101:self.func7MAPshft,
0b00000110:Instructions.zor,
0b00000111:Instructions.zand
}
self.func3MAPSYS={
0b00000000:self.func7MAPecall,
0b00000001:Instructions.csrrw,
0b00000010:Instructions.csrrs,
0b00000011:Instructions.csrrc,
0b00000101:Instructions.csrwi,
0b00000110:Instructions.csrrsi,
0b00000111:Instructions.csrrci
}
self.opcodeMAP={
0b00110111:Instructions.lui,
0b00010111:Instructions.auipc,
0b01101111:Instructions.jal,
0b01100111:Instructions.jalr,
0b01100011:self.func3MAPB,
0b00100011:self.func3MAPS,
0b00000011:self.func3MAPI1,
0b00010011:self.func3MAPI2,
0b00110011:self.func3MAPR,
0b01110011:self.func3MAPSYS
}
def getInstruction(self,opcode:c_ubyte,func3:c_ubyte,func7:c_ubyte):
inst=self.opcodeMAP[opcode.value]
if type(inst) is Instructions:
return inst
elif type(inst) is dict:
inst=inst[func3.value]
if type(inst) is Instructions:
return inst
elif type(inst) is dict:
inst=inst[func7.value]
if type(inst) is Instructions:
return inst
else:
logging.critical("ISA: Unimplemented Instructions encountered\n")
return Instructions.noimp
else:
logging.critical("ISA: Unimplemented Instructions encountered\n")
return Instructions.noimp
else:
logging.critical("ISA: Unimplemented Instructions encountered\n")
return Instructions.noimp