59 lines
1.9 KiB
Rust
59 lines
1.9 KiB
Rust
// Copyright (c) 2025 taitep
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// SPDX-License-Identifier: MIT
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//
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// This file is part of TRVE (https://gitea.taitep.se/taitep/trve)
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// See LICENSE file in the project root for full license text.
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mod rvi;
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use crate::{
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core::{Core, InstructionResult},
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decode::Instruction,
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};
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pub(crate) fn find_and_exec(instr: Instruction, core: &mut Core) -> Option<InstructionResult> {
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match instr.opcode_noncompressed() {
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0b01100 => match (instr.funct7(), instr.funct3()) {
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// OP
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(0b0000000, 0b000) => Some(rvi::add(core, instr)),
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_ => None,
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},
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0b00100 => match instr.funct3() {
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// OP_IMM
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0b000 => Some(rvi::addi(core, instr)),
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0b001 => (instr.funct6() == 0).then(|| rvi::slli(core, instr)),
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0b111 => Some(rvi::andi(core, instr)),
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_ => None,
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},
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0b00110 => match instr.funct3() {
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// OP_IMM_32
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0b000 => Some(rvi::addiw(core, instr)),
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_ => None,
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},
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0b01000 => match instr.funct3() {
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// STORE
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0b000 => Some(rvi::sb(core, instr)),
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0b011 => Some(rvi::sd(core, instr)),
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_ => None,
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},
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0b00000 => match instr.funct3() {
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// LOAD
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0b000 => Some(rvi::lb(core, instr)),
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0b100 => Some(rvi::lbu(core, instr)),
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0b011 => Some(rvi::ld(core, instr)),
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_ => None,
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},
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0b11000 => match instr.funct3() {
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// BRANCH
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0b000 => Some(rvi::beq(core, instr)),
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0b001 => Some(rvi::bne(core, instr)),
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_ => None,
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},
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0b01101 => Some(rvi::lui(core, instr)),
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0b00101 => Some(rvi::auipc(core, instr)),
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0b11011 => Some(rvi::jal(core, instr)),
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0b11001 => (instr.funct3() == 0).then(|| rvi::jalr(core, instr)),
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_ => None,
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}
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}
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