Press n or j to go to the next uncovered block, b, p or k for the previous block.
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BYTES_PER_WORD,
currentState,
changeRunBit,
instruction,
MEM_TEXT_START,
NUM_INST,
} from '@utils/constants';
import {getInstInfo, memRead, memWrite, memWriteHalf} from '@utils/functions';
export function OPCODE(INST: instruction): number {
return INST.opcode;
}
export function setOPCODE(INST: instruction, VAL: number): void {
INST.opcode = VAL;
}
export function FUNC(INST: instruction): number {
return INST.funcCode;
}
export function setFUNC(INST: instruction, VAL: number): void {
INST.funcCode = VAL;
}
export function RS(INST: instruction): number {
return INST.rs;
}
export function setRS(INST: instruction, VAL: number): void {
INST.rs = VAL;
}
export function RT(INST: instruction): number {
return INST.rt;
}
export function setRT(INST: instruction, VAL: number): void {
INST.rt = VAL;
}
export function RD(INST: instruction): number {
return INST.rd;
}
export function setRD(INST: instruction, VAL: number): void {
INST.rd = VAL;
}
export function SHAMT(INST: instruction): number {
return INST.shamt;
}
export function setSHAMT(INST: instruction, VAL: number): void {
INST.shamt = VAL;
}
export function IMM(INST: instruction): number {
return INST.imm;
}
export function setIMM(INST: instruction, VAL: number): void {
INST.imm = VAL;
}
export function IOFFSET(INST: instruction): number {
return IMM(INST);
}
export function TARGET(INST: instruction): number {
return INST.target;
}
export function setTARGET(INST: instruction, VAL: number): void {
INST.target = VAL;
}
export function signEX(X: number): number {
if (X & 0x8000) return X | 0xffff0000;
else return X;
}
export function zeroEX(X: number): number {
return X & 0x0000ffff;
}
export function jumpINST(TARGET: number): void {
currentState.PC = TARGET;
}
export function loadINST(LD: number, MASK: number): number {
return LD & MASK;
}
export function process_instruction() {
/*
* Procedure: process_instruction
* Purpose: Process one instruction
*/
const info: instruction = getInstInfo(currentState.PC);
// R type
if (OPCODE(info) === 0x0) {
const rs: number = RS(info);
const rt: number = RT(info);
const rd: number = RD(info);
const shamt: number = SHAMT(info);
const funcCode: number = FUNC(info);
// ADD
if (funcCode === 32) {
currentState.REGS[rd] = currentState.REGS[rs] + currentState.REGS[rt];
}
// ADDU
else if (funcCode === 33) {
currentState.REGS[rd] = currentState.REGS[rs] + currentState.REGS[rt];
}
// SUB
else Iif (funcCode === 34) {
currentState.REGS[rd] = currentState.REGS[rs] - currentState.REGS[rt];
}
// SUBU
else if (funcCode === 35) {
currentState.REGS[rd] = currentState.REGS[rs] - currentState.REGS[rt];
}
// AND
else if (funcCode === 36) {
currentState.REGS[rd] = currentState.REGS[rs] & currentState.REGS[rt];
}
// OR
else if (funcCode === 37) {
currentState.REGS[rd] = currentState.REGS[rs] | currentState.REGS[rt];
}
// NOR
else if (funcCode === 39) {
currentState.REGS[rd] = ~(currentState.REGS[rs] | currentState.REGS[rt]);
}
// SLT
else if (funcCode === 42) {
Iif (currentState.REGS[rs] < currentState.REGS[rt])
currentState.REGS[rd] = 1;
else currentState.REGS[rd] = 0;
}
// SLTU
else Iif (funcCode === 43) {
if (currentState.REGS[rs] < currentState.REGS[rt])
currentState.REGS[rd] = 1;
else currentState.REGS[rd] = 0;
}
// SLL
else if (funcCode === 0) {
currentState.REGS[rd] = currentState.REGS[rt] << shamt;
}
// SRL
else if (funcCode === 2) {
currentState.REGS[rd] = currentState.REGS[rt] >> shamt;
}
// JR
else Eif (funcCode === 8) {
currentState.PC = currentState.REGS[rs];
}
if (funcCode !== 8) currentState.PC += BYTES_PER_WORD;
}
// J
else if (OPCODE(info) === 0x2) {
const target: number = TARGET(info) << 2;
jumpINST(target);
}
// JAL
else if (OPCODE(info) === 0x3) {
const target: number = TARGET(info) << 2;
currentState.REGS[31] = currentState.PC + 8;
jumpINST(target);
}
// I type
else {
const rs: number = RS(info);
const rt: number = RT(info);
const imm: number = IMM(info);
const opcode: number = OPCODE(info);
// ADDI
if (opcode === 0x8) {
currentState.REGS[rt] = currentState.REGS[rs] + signEX(imm);
}
// ADDIU
else if (opcode === 0x9) {
currentState.REGS[rt] = currentState.REGS[rs] + signEX(imm);
}
// ANDI
else if (opcode === 0xc) {
currentState.REGS[rt] = currentState.REGS[rs] & zeroEX(imm);
}
// BEQ
else if (opcode === 0x4) {
if (currentState.REGS[rs] === currentState.REGS[rt])
currentState.PC += imm * 4;
}
// BNE
else if (opcode === 0x5) {
if (currentState.REGS[rs] !== currentState.REGS[rt]) {
currentState.PC += signEX(imm) * 4;
}
}
// LHU
else if (opcode === 0x25) {
currentState.REGS[rt] = loadINST(
memRead(currentState.REGS[rs] + signEX(IOFFSET(info))),
0x0000ffff,
);
}
// LUI
else if (opcode === 0xf) {
currentState.REGS[rt] = imm << 16;
}
// LW
else if (opcode == 0x23) {
currentState.REGS[rt] = memRead(
currentState.REGS[rs] + signEX(IOFFSET(info)),
);
}
// ORI
else if (opcode === 0xd) {
currentState.REGS[rt] = currentState.REGS[rs] | zeroEX(imm);
}
// SLTI
else Iif (opcode === 0xa) {
if (currentState.REGS[rs] < signEX(imm)) currentState.REGS[rt] = 1;
else currentState.REGS[rt] = 0;
}
// SLTIU
else if (opcode === 0xb) {
if (currentState.REGS[rs] < signEX(imm)) currentState.REGS[rt] = 1;
else currentState.REGS[rt] = 0;
}
// SH
else if (opcode === 0x29) {
memWriteHalf(
currentState.REGS[rs] + signEX(IOFFSET(info)),
currentState.REGS[rt],
);
}
// SW
else Eif (opcode === 0x2b) {
memWrite(
currentState.REGS[rs] + signEX(IOFFSET(info)),
currentState.REGS[rt],
);
}
currentState.PC += BYTES_PER_WORD;
}
if (currentState.PC - MEM_TEXT_START === NUM_INST * 4) {
changeRunBit();
}
}
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