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initMemory,
initInstInfo,
parseData,
parseInstr,
} from '@utils/functions';
export interface Iinstruction {
opcode: number;
funcCode: number;
value: number;
target: number;
rs: number;
rt: number;
imm: number;
rd: number;
shamt: number;
encoding: number;
expr: number;
}
interface IBcolors {
readonly BLUE: string;
readonly YELLOW: string;
readonly GREEN: string;
readonly RED: string;
readonly ENDC: string;
}
interface ISection {
readonly DATA: number;
readonly TEXT: number;
readonly MAX_SIZE: number;
}
export interface SymbolTableType {
readonly name: string;
readonly address: number;
}
export interface IinstList {
readonly [key: string]: instT;
}
export interface ISYMBOL_TABLE {
[key: string]: number;
}
export const DEBUG = 0;
export const MAX_SYMBOL_TABLE_SIZE = 1024;
export const MEM_TEXT_START = 0x00400000;
export const MEM_TEXT_SIZE = 0x00100000;
export const MEM_DATA_START = 0x10000000;
export const MEM_DATA_SIZE = 0x00100000;
export const MEM_STACK_START = 0x80000000;
export const MEM_STACK_SIZE = 0x00100000;
export const BYTES_PER_WORD = 4;
export const INST_LIST_LEN = 27;
export const MIPS_REGS = 32;
export const MEM_GROW_UP = 1;
export const MEM_GROW_DOWN = -1;
export const MEM_NREGIONS = 3;
export const DEBUG_SET = 0;
export const MEM_DUMP_SET = 1;
export let RUN_BIT = 1;
export let INSTRUCTION_COUNT = 0;
/*
Main memory
memory will be dynamically allocated at initialization
*/
export let memText: memRegionT;
export let memData: memRegionT;
export let memStack: memRegionT;
export let memRegions: memRegionT[];
export let currentState: cpuState;
export let NUM_INST: number;
export const INST_INFO: Iinstruction[] = [];
export const section: ISection = {
DATA: 0,
TEXT: 1,
MAX_SIZE: 2,
};
export const bcolors: IBcolors = {
BLUE: '\x1B[34m',
YELLOW: '\x1B[33m',
GREEN: '\x1B[32m',
RED: '\x1B[31m',
ENDC: '\x1B[0m',
};
const start = `[${bcolors.BLUE}START${bcolors.ENDC}] `;
const done = `[${bcolors.YELLOW}DONE${bcolors.ENDC}] `;
const success = `[${bcolors.GREEN}SUCCESS${bcolors.ENDC}] `;
const error = `[${bcolors.RED}ERROR${bcolors.ENDC}] `;
export const pType: string[] = [start, done, success, error];
// Structure Declaration
export class instT {
name: string;
type: string;
op: string;
funct: string;
constructor(name: string, op: string, type: string, funct: string) {
this.name = name;
this.op = op;
this.type = type;
this.funct = funct;
}
}
export class symbolT {
name: string;
address: number;
constructor() {
this.name = '';
this.address = 0;
}
}
export class laStruct {
op: string;
rt: string;
imm: string;
constructor(op: string, rt: string, imm: string) {
this.op = op;
this.rt = rt;
this.imm = imm;
}
}
export class cpuState {
PC: number;
REGS: number[];
constructor() {
this.PC = 0;
this.REGS = Array.from({length: 32}, () => 0);
this.REGS[29] = MEM_STACK_START;
}
}
export class instruction {
opcode: number;
funcCode: number;
value: number;
target: number;
rs: number;
rt: number;
imm: number;
rd: number;
shamt: number;
encoding: number;
expr: number;
constructor() {
this.opcode = 0;
this.funcCode = 0;
this.value = 0;
this.target = 0;
this.rs = 0;
this.rt = 0;
this.imm = 0;
this.rd = 0;
this.shamt = 0;
this.encoding = 0;
this.expr = 0;
}
}
export function initialize(
binary: string[],
textSize: number,
dataSize: number,
): Iinstruction[] {
initMemory();
// Load program and service routines into mem
let textIndex = 0;
let size = 0;
NUM_INST = ~~(textSize / 4);
// initial memory allocation of text segment
for (let i = 0; i < NUM_INST; i++) INST_INFO.push(new instruction());
initInstInfo(NUM_INST, INST_INFO);
binary.forEach(buffer => {
if (size < textSize) {
INST_INFO[textIndex] = parseInstr(buffer, size);
textIndex += 1;
} else Eif (size < textSize + dataSize) {
parseData(buffer, size - textSize);
}
size += 4;
});
currentState.PC = MEM_TEXT_START;
RUN_BIT = 1;
return INST_INFO;
}
/*
All simulated memory will be managed by this class
use the mem_write and mem_read functions to
access/modify the simulated memory
*/
export class memRegionT {
start: number;
size: number;
mem: number[];
offBound: number;
type: number;
dirty: boolean;
constructor(start: number, size: number, type: number = MEM_GROW_UP) {
this.start = start;
this.size = size;
this.mem = [];
this.offBound = -(size - 4) * type;
this.type = type;
this.dirty = false;
}
}
// Global Variable Declaration
const SLL = new instT('sll', '000000', 'R', '000000');
const SRL = new instT('srl', '000000', 'R', '000010');
const JR = new instT('jr', '000000', 'R', '001000');
const ADD = new instT('add', '000000', 'R', '100000');
const ADDU = new instT('addu', '000000', 'R', '100001');
const AND = new instT('and', '000000', 'R', '100100');
const NOR = new instT('nor', '000000', 'R', '100111');
const OR = new instT('or', '000000', 'R', '100101');
const SLT = new instT('slt', '000000', 'R', '101010');
const SLTU = new instT('sltu', '000000', 'R', '101011');
const SUB = new instT('sub', '000000', 'R', '100010');
const SUBU = new instT('subu', '000000', 'R', '100011');
const LUI = new instT('lui', '001111', 'I', '');
const BEQ = new instT('beq', '000100', 'I', '');
const BNE = new instT('bne', '000101', 'I', '');
const LW = new instT('lw', '100011', 'I', '');
const LHU = new instT('lhu', '100101', 'I', '');
const SW = new instT('sw', '101011', 'I', '');
const SH = new instT('sh', '101001', 'I', '');
const ADDI = new instT('addi', '001000', 'I', '');
const ADDIU = new instT('addiu', '001001', 'I', '');
const ANDI = new instT('andi', '001100', 'I', '');
const ORI = new instT('ori', '001101', 'I', '');
const SLTI = new instT('slti', '001010', 'I', '');
const SLTIU = new instT('sltiu', '001011', 'I', '');
const J = new instT('j', '000010', 'J', '');
const JAL = new instT('jal', '000011', 'J', '');
export const instList: IinstList = {
add: ADD,
addi: ADDI,
addiu: ADDIU,
addu: ADDU,
and: AND,
andi: ANDI,
beq: BEQ,
bne: BNE,
j: J,
jal: JAL,
jr: JR,
lhu: LHU,
lui: LUI,
lw: LW,
nor: NOR,
or: OR,
ori: ORI,
slt: SLT,
slti: SLTI,
sltiu: SLTIU,
sltu: SLTU,
sll: SLL,
srl: SRL,
sh: SH,
sw: SW,
sub: SUB,
subu: SUBU,
};
// Global symbol table
export const symbolStruct = new symbolT();
export let SYMBOL_TABLE: ISYMBOL_TABLE = {};
export const resetSymbolTable = () => {
SYMBOL_TABLE = {};
};
export const initializeMem = () => {
INSTRUCTION_COUNT = 0;
RUN_BIT = 1;
memText = new memRegionT(MEM_TEXT_START, MEM_TEXT_SIZE);
memData = new memRegionT(MEM_DATA_START, MEM_DATA_SIZE);
memStack = new memRegionT(
MEM_STACK_START - MEM_STACK_SIZE,
MEM_STACK_SIZE,
MEM_GROW_DOWN,
);
memRegions = [memText, memData, memStack];
currentState = new cpuState();
};
/* INSTRUCTION COUNT ADD */
export const instAddOne = () => {
INSTRUCTION_COUNT += 1;
};
export const numInstSub = () => {
NUM_INST -= 1;
};
export const changeRunBit = () => {
RUN_BIT = 0;
};
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