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rv32i.toml
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rv32i.toml
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[meta]
name = "RISC-V 32-bits base integer ISA"
code = "RV32I"
spec = "Unprivileged 20190608-Base-Ratified"
[consts]
# Size of base integer registers in bits
XLEN = 32
# Alignment of instructions in bits
IALIGN = 32
# Maximum length of instructions in bits
ILEN = 32
[registers]
[registers.names]
0 = ["x0", "zero"]
1 = ["x1", "ra"]
2 = ["x2", "sp"]
3 = ["x3", "gp"]
4 = ["x4", "tp"]
5 = ["x5", "t0"]
6 = ["x6", "t1"]
7 = ["x7", "t2"]
8 = ["x8", "fp", "s0"]
9 = ["x9", "s1"]
10 = ["x10", "a0"]
11 = ["x11", "a1"]
12 = ["x12", "a2"]
13 = ["x13", "a3"]
14 = ["x14", "a4"]
15 = ["x15", "a5"]
16 = ["x16", "a6"]
17 = ["x17", "a7"]
18 = ["x18", "s2"]
19 = ["x19", "s3"]
20 = ["x20", "s4"]
21 = ["x21", "s5"]
22 = ["x22", "s6"]
23 = ["x23", "s7"]
24 = ["x24", "s8"]
25 = ["x25", "s9"]
26 = ["x26", "s10"]
27 = ["x27", "s11"]
28 = ["x28", "t3"]
29 = ["x29", "t4"]
30 = ["x30", "t5"]
31 = ["x31", "t6"]
[registers.lengths]
0 = "XLEN"
1 = "XLEN"
2 = "XLEN"
3 = "XLEN"
4 = "XLEN"
5 = "XLEN"
6 = "XLEN"
7 = "XLEN"
8 = "XLEN"
9 = "XLEN"
10 = "XLEN"
11 = "XLEN"
12 = "XLEN"
13 = "XLEN"
14 = "XLEN"
15 = "XLEN"
16 = "XLEN"
17 = "XLEN"
18 = "XLEN"
19 = "XLEN"
20 = "XLEN"
21 = "XLEN"
22 = "XLEN"
23 = "XLEN"
24 = "XLEN"
25 = "XLEN"
26 = "XLEN"
27 = "XLEN"
28 = "XLEN"
29 = "XLEN"
30 = "XLEN"
31 = "XLEN"
[instruction_formats]
[instruction_formats.R]
opcode = { type = "value", length = 7, encoding = [[6,0,0]] }
# Destination register
rd = { type = "register", length = 5, encoding = [[4,0,7]] }
# Function selector
funct3 = { type = "value", length = 3, encoding = [[2,0,12]] }
# Source register 1
rs1 = { type = "register", length = 5, encoding = [[4,0,15]] }
# Source register 2
rs2 = { type = "register", length = 5, encoding = [[4,0,20]] }
# Secondary function selector
funct7 = { type = "value", length = 7, encoding = [[6,0,25]] }
[instruction_formats.I]
opcode = { type = "value", length = 7, encoding = [[6,0,0]] }
rd = { type = "register", length = 5, encoding = [[4,0,7]] }
funct3 = { type = "value", length = 3, encoding = [[2,0,12]] }
rs1 = { type = "register", length = 5, encoding = [[4,0,15]] }
imm = { type = "value", length = 12, encoding = [[11,0,20]] }
[instruction_formats.Ishift]
opcode = { type = "value", length = 7, encoding = [[6,0,0]] }
rd = { type = "register", length = 5, encoding = [[4,0,7]] }
funct3 = { type = "value", length = 3, encoding = [[2,0,12]] }
rs1 = { type = "register", length = 5, encoding = [[4,0,15]] }
imm = { type = "value", length = 5, encoding = [[4,0,20]] }
shcst = { type = "value", length = 7, encoding = [[6,0,25]] }
[instruction_formats.S]
opcode = { type = "value", length = 7, encoding = [[6,0,0]] }
# IMM
funct3 = { type = "value", length = 3, encoding = [[2,0,12]] }
rs1 = { type = "register", length = 5, encoding = [[4,0,15]] }
rs2 = { type = "register", length = 5, encoding = [[4,0,20]] }
imm = { type = "value", length = 12, encoding = [[4,0,7], [11,5,25]] }
[instruction_formats.B]
opcode = { type = "value", length = 7, encoding = [[6,0,0]] }
# IMM
funct3 = { type = "value", length = 3, encoding = [[2,0,12]] }
rs1 = { type = "register", length = 5, encoding = [[4,0,15]] }
rs2 = { type = "register", length = 5, encoding = [[4,0,20]] }
imm = { type = "value", length = 13, encoding = [[11,11,7], [4,1,8], [10,5,25], [12,12,31]] }
[instruction_formats.U]
opcode = { type = "value", length = 7, encoding = [[6,0,0]] }
rd = { type = "register", length = 5, encoding = [[4,0,7]] }
imm = { type = "value", length = 32, encoding = [[31,12,12]] }
[instruction_formats.J]
opcode = { type = "value", length = 7, encoding = [[6,0,0]] }
rd = { type = "register", length = 5, encoding = [[4,0,7]] }
imm = { type = "value", length = 32, encoding = [[19,12,12], [11,11,20], [10,1,21], [20,20,31]] }
[instructions]
# Following the order in Chapter 25, Instruction Set Listings
[instructions.lui]
format = "U"
args = ["rd", "imm"]
fields = { opcode = 0b0110111 }
[instructions.auipc]
format = "U"
args = ["rd", "imm"]
fields = { opcode = 0b0010111 }
[instructions.jal]
format = "J"
args = ["rd", "imm"]
fields = { opcode = 0b1101111 }
[instructions.jalr]
format = "I"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b1100111 }
[instructions.beq]
format = "B"
args = ["rs1", "rs2", "imm"]
fields = { opcode = 0b1100011, funct3 = 0b000 }
[instructions.bne]
format = "B"
args = ["rs1", "rs2", "imm"]
fields = { opcode = 0b1100011, funct3 = 0b001 }
[instructions.blt]
format = "B"
args = ["rs1", "rs2", "imm"]
fields = { opcode = 0b1100011, funct3 = 0b100 }
[instructions.bge]
format = "B"
args = ["rs1", "rs2", "imm"]
fields = { opcode = 0b1100011, funct3 = 0b101 }
[instructions.bltu]
format = "B"
args = ["rs1", "rs2", "imm"]
fields = { opcode = 0b1100011, funct3 = 0b110 }
[instructions.bgeu]
format = "B"
args = ["rs1", "rs2", "imm"]
fields = { opcode = 0b1100011, funct3 = 0b111 }
# lb dest, 2(x1)
[instructions.lb]
format = "I"
args = ["rd", "imm", "rs1"]
fields = { opcode = 0b0000011, funct3 = 0b000 }
[instructions.lh]
format = "I"
args = ["rd", "imm", "rs1"]
fields = { opcode = 0b0000011, funct3 = 0b001 }
[instructions.lw]
format = "I"
args = ["rd", "imm", "rs1"]
fields = { opcode = 0b0000011, funct3 = 0b010 }
[instructions.lbu]
format = "I"
args = ["rd", "imm", "rs1"]
fields = { opcode = 0b0000011, funct3 = 0b100 }
[instructions.lhu]
format = "I"
args = ["rd", "imm", "rs1"]
fields = { opcode = 0b0000011, funct3 = 0b101 }
# sb srcv, 2(x1)
[instructions.sb]
format = "S"
args = ["rs2", "imm", "rs1"]
fields = { opcode = 0b0100011, funct3 = 0b000 }
[instructions.sh]
format = "S"
args = ["rs2", "imm", "rs1"]
fields = { opcode = 0b0100011, funct3 = 0b001 }
[instructions.sw]
format = "S"
args = ["rs2", "imm", "rs1"]
fields = { opcode = 0b0100011, funct3 = 0b010 }
[instructions.addi]
format = "I"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b0010011, funct3 = 0b000 }
[instructions.slti]
format = "I"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b0010011, funct3 = 0b010 }
[instructions.sltiu]
format = "I"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b0010011, funct3 = 0b011 }
[instructions.xori]
format = "I"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b0010011, funct3 = 0b100 }
[instructions.ori]
format = "I"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b0010011, funct3 = 0b110 }
[instructions.andi]
format = "I"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b0010011, funct3 = 0b111 }
[instructions.slli]
format = "Ishift"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b0010011, funct3 = 0b001, shcst = 0b0000000 }
[instructions.srli]
format = "Ishift"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b0010011, funct3 = 0b101, shcst = 0b0000000 }
[instructions.srai]
format = "Ishift"
args = ["rd", "rs1", "imm"]
fields = { opcode = 0b0010011, funct3 = 0b101, shcst = 0b0100000 }
[instructions.add]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b000, funct7 = 0b0000000 }
[instructions.sub]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b000, funct7 = 0b0100000 }
[instructions.sll]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b001, funct7 = 0b0000000 }
[instructions.slt]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b010, funct7 = 0b0000000 }
[instructions.sltu]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b011, funct7 = 0b0000000 }
[instructions.xor]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b100, funct7 = 0b0000000 }
[instructions.srl]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b101, funct7 = 0b0000000 }
[instructions.sra]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b101, funct7 = 0b0100000 }
[instructions.or]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b110, funct7 = 0b0000000 }
[instructions.and]
format = "R"
args = ["rd", "rs1", "rs2"]
fields = { opcode = 0b0110011, funct3 = 0b111, funct7 = 0b0000000 }
[instructions.fence]
format = "I"
args = ["imm"]
fields = { opcode = 0b0001111, rd = 0, funct3 = 0b000, rs1 = 0 }
[instructions.ecall]
format = "I"
args = []
fields = { opcode = 0b1110011, rd = 0, funct3 = 0, rs1 = 0, imm = 0 }
[instructions.ebreak]
format = "I"
args = []
fields = { opcode = 0b1110011, rd = 0, funct3 = 0, rs1 = 0, imm = 1 }