319 lines
6.7 KiB
Haskell
319 lines
6.7 KiB
Haskell
module Language.Elna.Architecture.RiscV
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( BaseOpcode(..)
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, RelocationType(..)
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, Funct3(..)
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, Funct7(..)
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, Funct12(..)
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, Instruction(..)
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, Type(..)
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, XRegister(..)
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, baseOpcode
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, funct3
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, funct12
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, instruction
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, xRegister
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) where
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import qualified Data.ByteString.Builder as ByteString.Builder
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import Data.Bits (Bits(..))
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import Data.Text (Text)
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import Data.Word (Word8, Word32)
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data XRegister
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= Zero
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| RA
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| SP
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| GP
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| TP
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| T0
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| T1
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| T2
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| S0
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| S1
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| A0
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| A1
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| A2
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| A3
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| A4
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| A5
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| A6
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| A7
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| S2
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| S3
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| S4
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| S5
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| S6
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| S7
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| S8
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| S9
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| S10
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| S11
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| T3
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| T4
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| T5
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| T6
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deriving Eq
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data Funct3
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= ADDI
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| SLTI
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| SLTIU
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| ANDI
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| ORI
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| XORI
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| SLLI
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| SRLI
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| SRAI
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| ADD
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| SLT
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| SLTU
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| AND
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| OR
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| XOR
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| SLL
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| SRL
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| SUB
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| SRA
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| BEQ
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| BNE
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| BLT
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| BLTU
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| BGE
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| BGEU
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| FENCE
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| FENCEI
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| CSRRW
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| CSRRS
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| CSRRC
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| CSRRWI
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| CSRRSI
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| CSRRCI
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| PRIV
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| SB
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| SH
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| SW
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| LB
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| LH
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| LW
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| LBU
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| LHU
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| JALR
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| MUL
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| MULH
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| MULHSU
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| MULHU
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| DIV
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| DIVU
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| REM
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| REMU
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deriving Eq
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data Funct12
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= ECALL
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| EBREAK
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deriving Eq
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newtype Funct7 = Funct7
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{ funct7 :: Word8
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} deriving Eq
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data BaseOpcode
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= OpImm
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| Lui
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| Auipc
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| Op
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| Jal
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| Jalr
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| Branch
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| Load
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| Store
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| MiscMem
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| System
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deriving Eq
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data Type
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= I XRegister Funct3 XRegister Word32
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| S Word32 Funct3 XRegister XRegister
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| B Word32 Funct3 XRegister XRegister
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| R XRegister Funct3 XRegister XRegister Funct7
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| U XRegister Word32
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| J XRegister Word32
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| Type XRegister Funct3 XRegister Funct12 -- Privileged.
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deriving Eq
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data RelocationType
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= Lower12I XRegister Funct3 XRegister Text
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| Lower12S Text Funct3 XRegister XRegister
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| Higher20 XRegister Text -- Type U.
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deriving Eq
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data Instruction
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= Instruction BaseOpcode Type
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| RelocatableInstruction BaseOpcode RelocationType
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| CallInstruction Text
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deriving Eq
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xRegister :: XRegister -> Word8
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xRegister Zero = 0
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xRegister RA = 1
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xRegister SP = 2
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xRegister GP = 3
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xRegister TP = 4
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xRegister T0 = 5
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xRegister T1 = 6
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xRegister T2 = 7
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xRegister S0 = 8
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xRegister S1 = 9
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xRegister A0 = 10
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xRegister A1 = 11
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xRegister A2 = 12
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xRegister A3 = 13
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xRegister A4 = 14
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xRegister A5 = 15
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xRegister A6 = 16
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xRegister A7 = 17
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xRegister S2 = 18
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xRegister S3 = 19
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xRegister S4 = 20
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xRegister S5 = 21
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xRegister S6 = 22
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xRegister S7 = 23
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xRegister S8 = 24
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xRegister S9 = 25
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xRegister S10 = 26
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xRegister S11 = 27
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xRegister T3 = 28
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xRegister T4 = 29
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xRegister T5 = 30
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xRegister T6 = 31
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funct3 :: Funct3 -> Word8
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funct3 ADDI = 0b000
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funct3 SLTI = 0b001
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funct3 SLTIU = 0b011
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funct3 ANDI = 0b111
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funct3 ORI = 0b110
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funct3 XORI = 0b100
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funct3 SLLI = 0b000
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funct3 SRLI = 0b101
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funct3 SRAI = 0b101
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funct3 ADD = 0b000
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funct3 SLT = 0b010
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funct3 SLTU = 0b011
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funct3 AND = 0b111
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funct3 OR = 0b110
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funct3 XOR = 0b100
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funct3 SLL = 0b001
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funct3 SRL = 0b101
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funct3 SUB = 0b000
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funct3 SRA = 0b101
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funct3 BEQ = 0b000
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funct3 BNE = 0b001
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funct3 BLT = 0b100
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funct3 BLTU = 0b110
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funct3 BGE = 0b101
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funct3 BGEU = 0b111
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funct3 FENCE = 0b000
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funct3 FENCEI = 0b001
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funct3 CSRRW = 0b001
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funct3 CSRRS = 0b010
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funct3 CSRRC = 0b011
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funct3 CSRRWI = 0b101
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funct3 CSRRSI = 0b110
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funct3 CSRRCI = 0b111
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funct3 PRIV = 0b000
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funct3 SB = 0b000
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funct3 SH = 0b001
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funct3 SW = 0b010
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funct3 LB = 0b000
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funct3 LH = 0b001
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funct3 LW = 0b010
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funct3 LBU = 0b100
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funct3 LHU = 0b101
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funct3 JALR = 0b000
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funct3 MUL = 0b000
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funct3 MULH = 0b001
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funct3 MULHSU = 0b010
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funct3 MULHU = 0b011
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funct3 DIV = 0b100
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funct3 DIVU = 0b101
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funct3 REM = 0b110
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funct3 REMU = 0b111
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funct12 :: Funct12 -> Word8
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funct12 ECALL = 0b000000000000
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funct12 EBREAK = 0b000000000001
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baseOpcode :: BaseOpcode -> Word8
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baseOpcode OpImm = 0b0010011
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baseOpcode Lui = 0b0110111
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baseOpcode Auipc = 0b0010111
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baseOpcode Op = 0b0110011
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baseOpcode Jal = 0b1101111
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baseOpcode Jalr = 0b1100111
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baseOpcode Branch = 0b1100011
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baseOpcode Load = 0b0000011
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baseOpcode Store = 0b0100011
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baseOpcode MiscMem = 0b0001111
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baseOpcode System = 0b1110011
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type' :: Type -> Word32
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type' (I rd funct3' rs1 immediate)
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= (fromIntegral (xRegister rd) `shiftL` 7)
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.|. (fromIntegral (funct3 funct3') `shiftL` 12)
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.|. (fromIntegral (xRegister rs1) `shiftL` 15)
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.|. (immediate `shiftL` 20);
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type' (S immediate funct3' rs1 rs2)
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= ((immediate .&. 0x1f) `shiftL` 7)
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.|. (fromIntegral (funct3 funct3') `shiftL` 12)
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.|. (fromIntegral (xRegister rs1) `shiftL` 15)
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.|. (fromIntegral (xRegister rs2) `shiftL` 20)
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.|. ((immediate .&. 0xfe0) `shiftL` 20)
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type' (B immediate funct3' rs1 rs2)
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= ((immediate .&. 0x800) `shiftR` 4)
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.|. ((immediate .&. 0x1e) `shiftL` 7)
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.|. (fromIntegral (funct3 funct3') `shiftL` 12)
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.|. (fromIntegral (xRegister rs1) `shiftL` 15)
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.|. (fromIntegral (xRegister rs2) `shiftL` 20)
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.|. ((immediate .&. 0x7e0) `shiftL` 20)
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.|. ((immediate .&. 0x1000) `shiftL` 19)
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type' (R rd funct3' rs1 rs2 funct7')
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= (fromIntegral (xRegister rd) `shiftL` 7)
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.|. (fromIntegral (funct3 funct3') `shiftL` 12)
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.|. (fromIntegral (xRegister rs1) `shiftL` 15)
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.|. (fromIntegral (xRegister rs2) `shiftL` 20)
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.|. (fromIntegral (funct7 funct7') `shiftL` 25);
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type' (U rd immediate)
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= (fromIntegral (xRegister rd) `shiftL` 7)
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.|. (immediate `shiftL` 12)
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type' (J rd immediate)
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= (fromIntegral (xRegister rd) `shiftL` 7)
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.|. (immediate .&. 0xff000)
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.|. ((immediate .&. 0x800) `shiftL` 9)
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.|. ((immediate .&. 0x7fe) `shiftL` 20)
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.|. ((immediate .&. 0x100000) `shiftL` 11);
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type' (Type rd funct3' rs1 funct12')
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= (fromIntegral (xRegister rd) `shiftL` 7)
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.|. (fromIntegral (funct3 funct3') `shiftL` 12)
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.|. (fromIntegral (xRegister rs1) `shiftL` 15)
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.|. (fromIntegral (funct12 funct12') `shiftL` 20);
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relocationType :: RelocationType -> Word32
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relocationType (Lower12I rd funct3' rs1 _) = type' $ I rd funct3' rs1 0
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relocationType (Lower12S _ funct3' rs1 rs2) = type' $ S 0 funct3' rs1 rs2
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relocationType (Higher20 rd _) = type' $ U rd 0
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instruction :: Instruction -> ByteString.Builder.Builder
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instruction = \case
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(Instruction base instructionType) -> go base $ type' instructionType
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(RelocatableInstruction base instructionType) -> go base $ relocationType instructionType
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(CallInstruction _) -> foldMap instruction
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[ Instruction Auipc $ U RA 0
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, Instruction Jalr $ I RA JALR RA 0
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]
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where
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go base instructionType
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= ByteString.Builder.word32LE
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$ fromIntegral (baseOpcode base)
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.|. instructionType
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