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riscv.hpp
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riscv.hpp
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//
// Created by hanchong on 2020/7/7.
//
#ifndef RISC_V_SIMULATOR_RISCV_HPP
#define RISC_V_SIMULATOR_RISCV_HPP
#include <iostream>
#include <sstream>
#include <string>
#include <cstring>
#include <bitset>
enum Insttype {
LUI, AUIPC, //U-type
JAL, //J-type
JALR, LB, LH, LW, LBU, LHU,
ADDI, SLTI,SLTIU, XORI, ORI, ANDI, SLLI, SRLI, SRAI, //I-type
ADD, SUB, SLL, SLT, SLTU, XOR, SRL, SRA, OR, AND, //R-type
BEQ, BNE, BLT, BGE, BLTU, BGEU, //B-type
SB, SH, SW, //S-type
NOP, START
};
unsigned char memory[0x20000];
int regi[32];
unsigned int pc = 0;
bool ifrun = true, ifmem = false, ifpredict = true;
int datacnt = 0, memcnt = 0;
int get_num(int inst, int l, int r) {
int ret = ((inst >> l) & (1 << (r - l + 1)) - 1);
return ret;
}
struct instcode {
int inst = 0;
int rs1 = -1;
int rs2 = -1;
int rd = -1;
int imm = 0;
int shamt = 0;
int value = 0;
int addr = 0;
int inspc = 0;
bool ifjump = false;
Insttype type = START;
void clear() {
inst = 0, rs1 = -1, rs2 = -1, rd = -1, imm = 0, shamt = 0, value = 0, addr = 0, inspc = 0, ifjump = false, type = NOP;
}
};
instcode IF_ID, ID_EX, EX_MEM, MEM_WB;
struct predictor {
int count = 0; //00 01 for notjump, 10 11 for jump
bool ifjump = false; //true for jump, false for notjump
bool ifright(bool ifju) {
if (count == 0) {
if (ifju) {
count = 1;
ifjump = false;
return false;
}
return true;
}
else if (count == 1) {
if (ifju) {
count = 3;
ifjump = true;
return false;
}
else {
count = 0;
ifjump = false;
return true;
}
}
else if (count == 2) {
if (ifju) {
count = 3;
ifjump = true;
return true;
}
else {
count = 0;
ifjump = false;
return false;
}
}
else if (count == 3) {
if (!ifju) {
count = 2;
ifjump = true;
return false;
}
return true;
}
};
}predi[100];
int get_U_imm (const int &inst) {
int ret = get_num(inst, 12, 31);
ret <<= 12;
return ret;
};
int get_J_imm (const int &inst) {
int ret = 0;
if (inst >> 31) ret = (1 << 13) - 1;
ret <<= 8;
ret += get_num(inst, 12, 19);
ret <<= 1;
ret += get_num(inst, 20, 20);
ret <<= 10;
ret += get_num(inst, 21, 30);
ret <<= 1;
return ret;
};
int get_I_imm (const int &inst) {
int ret = 0;
if (inst >> 31) ret = (1 << 22) - 1;
ret <<= 11;
ret += get_num(inst, 20, 30);
return ret;
};
int get_B_imm (const int &inst) {
int ret = 0;
if (inst >> 31) ret = (1 << 21) - 1;
ret <<= 1;
ret += get_num(inst, 7, 7);
ret <<= 6;
ret += get_num(inst, 25, 30);
ret <<= 4;
ret += get_num(inst, 8, 11);
ret <<= 1;
return ret;
};
int get_S_imm (const int &inst) {
int ret = 0;
if (inst >> 31) ret = (1 << 22) - 1;
ret <<= 6;
ret += get_num(inst, 25, 30);
ret <<= 4;
ret += get_num(inst, 8, 11);
ret <<= 1;
ret += get_num(inst, 7, 7);
return ret;
};
void IF() {
int inst = *((unsigned int*)(memory + pc));
IF_ID.inspc = pc;
pc += 4;
IF_ID.inst = inst;
}
void ID(instcode obj) {
if ((!ifpredict) || EX_MEM.ifjump) return;
int inst = obj.inst;
int opcode = inst & 127;
int funct3 = get_num(inst, 12, 14);
int funct7 = get_num(inst, 25, 31);
if (IF_ID.type == NOP) {
IF_ID.type = START;
ID_EX.type = NOP;
ID_EX.inst = 0;
return;
}
switch (opcode) {
case 55:
obj.type = LUI;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_U_imm(inst); break;
case 23:
obj.type = AUIPC;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_U_imm(inst); break;
case 111:
obj.type = JAL;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_J_imm(inst);
pc = obj.inspc + obj.imm;
ID_EX.ifjump = true; break;
case 103:
obj.type = JALR;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 99:
switch (funct3) {
case 0:
obj.type = BEQ;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.imm = get_B_imm(inst);
if (predi[obj.inspc & 63].ifjump) {
pc = obj.inspc + obj.imm;
ID_EX.ifjump = true;
} break;
case 1:
obj.type = BNE;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.imm = get_B_imm(inst);
if (predi[obj.inspc & 63].ifjump) {
pc = obj.inspc + obj.imm;
ID_EX.ifjump = true;
} break;
case 4:
obj.type = BLT;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.imm = get_B_imm(inst);
if (predi[obj.inspc & 63].ifjump) {
pc = obj.inspc + obj.imm;
ID_EX.ifjump = true;
} break;
case 5:
obj.type = BGE;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.imm = get_B_imm(inst);
if (predi[obj.inspc & 63].ifjump) {
pc = obj.inspc + obj.imm;
ID_EX.ifjump = true;
} break;
case 6:
obj.type = BLTU;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.imm = get_B_imm(inst);
if (predi[obj.inspc & 63].ifjump) {
pc = obj.inspc + obj.imm;
ID_EX.ifjump = true;
} break;
case 7:
obj.type = BGEU;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.imm = get_B_imm(inst);
if (predi[obj.inspc & 63].ifjump) {
pc = obj.inspc + obj.imm;
ID_EX.ifjump = true;
} break;
} break;
case 3:
switch (funct3) {
case 0:
obj.type = LB;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 1:
obj.type = LH;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 2:
obj.type = LW;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 4:
obj.type = LBU;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 5:
obj.type = LHU;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
} break;
case 35:
switch (funct3) {
case 0:
obj.type = SB;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.imm = get_S_imm(inst); break;
case 1:
obj.type = SH;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.imm = get_S_imm(inst); break;
case 2:
obj.type = SW;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.imm = get_S_imm(inst); break;
} break;
case 19:
switch (funct3) {
case 0:
obj.type = ADDI;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 2:
obj.type = SLTI;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 3:
obj.type = SLTIU;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 4:
obj.type = XORI;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 6:
obj.type = ORI;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 7:
obj.type = ANDI;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19); break;
case 1:
obj.type = SLLI;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19);
obj.shamt = get_num(inst, 20, 24); break;
case 5:
switch (funct7) {
case 0:
obj.type = SRLI;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19);
obj.shamt = get_num(inst, 20, 24); break;
case 32:
obj.type = SRAI;
obj.rd = get_num(inst, 7, 11);
obj.imm = get_I_imm(inst);
obj.rs1 = get_num(inst, 15, 19);
obj.shamt = get_num(inst, 20, 24); break;
} break;
} break;
case 51:
switch (funct7) {
case 0:
switch (funct3) {
case 0:
obj.type = ADD;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
case 1:
obj.type = SLL;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
case 2:
obj.type = SLT;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
case 3:
obj.type = SLTU;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
case 4:
obj.type = XOR;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
case 5:
obj.type = SRL;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
case 6:
obj.type = OR;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
case 7:
obj.type = AND;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
} break;
case 32:
switch (funct3) {
case 0:
obj.type = SUB;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
case 5:
obj.type = SRA;
obj.rs1 = get_num(inst, 15, 19);
obj.rs2 = get_num(inst, 20, 24);
obj.rd = get_num(inst, 7, 11); break;
} break;
} break;
}
ID_EX.inst = obj.inst, ID_EX.rs1 = obj.rs1, ID_EX.rs2 = obj.rs2, ID_EX.rd = obj.rd,
ID_EX.shamt = obj.shamt, ID_EX.value = obj.value, ID_EX.addr = obj.addr, ID_EX.type = obj.type,
ID_EX.inspc = obj.inspc, ID_EX.imm = obj.imm;
}
void EX(instcode obj) {
switch (obj.type) {
case NOP:
obj.inst = 0;
break;
case START:
break;
case LUI:
obj.value = obj.imm;
break;
case AUIPC:
obj.value = obj.imm + obj.inspc;
break;
case JAL:
obj.value = obj.inspc + 4;
// pc = pc + obj.imm - 4;
// EX_MEM.ifjump = true;
break;
case JALR:
obj.value = obj.inspc + 4;
pc = (regi[obj.rs1] + obj.imm) & ~1;
EX_MEM.ifjump = true;
break;
case BEQ:
if (regi[obj.rs1] == regi[obj.rs2]) {
// EX_MEM.ifjump = true;
// pc = pc + obj.imm - 4;
ifpredict = predi[obj.inspc & 63].ifright(true);
if (!ifpredict) pc = obj.inspc + obj.imm;
}
else {
ifpredict = predi[obj.inspc & 63].ifright(false);
if (!ifpredict) pc = obj.inspc + 4;
} break;
case BNE:
if (regi[obj.rs1] != regi[obj.rs2]) {
// EX_MEM.ifjump = true;
// pc = pc + obj.imm - 4;
ifpredict = predi[obj.inspc & 63].ifright(true);
if (!ifpredict) pc = obj.inspc + obj.imm;
}
else {
ifpredict = predi[obj.inspc & 63].ifright(false);
if (!ifpredict) pc = obj.inspc + 4;
} break;
case BLT:
if (regi[obj.rs1] < regi[obj.rs2]) {
// EX_MEM.ifjump = true;
// pc = pc + obj.imm - 4;
ifpredict = predi[obj.inspc & 63].ifright(true);
if (!ifpredict) pc = obj.inspc + obj.imm;
}
else {
ifpredict = predi[obj.inspc & 63].ifright(false);
if (!ifpredict) pc = obj.inspc + 4;
} break;
case BGE:
if (regi[obj.rs1] >= regi[obj.rs2]) {
// EX_MEM.ifjump = true;
// pc = pc + obj.imm - 4;
ifpredict = predi[obj.inspc & 63].ifright(true);
if (!ifpredict) pc = obj.inspc + obj.imm;
}
else {
ifpredict = predi[obj.inspc & 63].ifright(false);
if (!ifpredict) pc = obj.inspc + 4;
} break;
case BLTU:
if ((unsigned int)regi[obj.rs1] < (unsigned int)regi[obj.rs2]) {
// EX_MEM.ifjump = true;
// pc = pc + obj.imm - 4;
ifpredict = predi[obj.inspc & 63].ifright(true);
if (!ifpredict) pc = obj.inspc + obj.imm;
}
else {
ifpredict = predi[obj.inspc & 63].ifright(false);
if (!ifpredict) pc = obj.inspc + 4;
} break;
case BGEU:
if ((unsigned int)regi[obj.rs1] >= (unsigned int)regi[obj.rs2]) {
// EX_MEM.ifjump = true;
// pc = pc + obj.imm - 4;
ifpredict = predi[obj.inspc & 63].ifright(true);
if (!ifpredict) pc = obj.inspc + obj.imm;
}
else {
ifpredict = predi[obj.inspc & 63].ifright(false);
if (!ifpredict) pc = obj.inspc + 4;
} break;
case LB:
case LH:
case LW:
case LBU:
case LHU:
case SB:
case SH:
case SW:
obj.addr = regi[obj.rs1] + obj.imm;
break;
case ADDI:
obj.value = regi[obj.rs1] + obj.imm;
break;
case SLTI:
obj.value = regi[obj.rs1] < obj.imm;
break;
case SLTIU:
obj.value = (unsigned int)regi[obj.rs1] < (unsigned int)obj.imm;
break;
case XORI:
obj.value = regi[obj.rs1] ^ obj.imm;
break;
case ORI:
obj.value = regi[obj.rs1] | obj.imm;
break;
case ANDI:
obj.value = regi[obj.rs1] & obj.imm;
break;
case SLLI:
obj.value = regi[obj.rs1] << obj.shamt;
break;
case SRLI:
obj.value = (unsigned int)regi[obj.rs1] >> obj.shamt;
break;
case SRAI:
obj.value = regi[obj.rs1] >> obj.shamt;
break;
case ADD:
obj.value = regi[obj.rs1] + regi[obj.rs2];
break;
case SUB:
obj.value = regi[obj.rs1] - regi[obj.rs2];
break;
case SLL:
obj.value = regi[obj.rs1] << regi[obj.rs2];
break;
case SLT:
obj.value = regi[obj.rs1] < regi[obj.rs2];
break;
case SLTU:
obj.value = (unsigned int)regi[obj.rs1] < (unsigned int)regi[obj.rs2];
break;
case XOR:
obj.value = regi[obj.rs1] ^ regi[obj.rs2];
break;
case SRL:
obj.value = (unsigned int)regi[obj.rs1] >> regi[obj.rs2];
break;
case SRA:
obj.value = regi[obj.rs1] >> regi[obj.rs2];
break;
case OR:
obj.value = regi[obj.rs1] | regi[obj.rs2];
break;
case AND:
obj.value = regi[obj.rs1] & regi[obj.rs2];
break;
}
EX_MEM.inst = obj.inst, EX_MEM.rs1 = obj.rs1, EX_MEM.rs2 = obj.rs2, EX_MEM.rd = obj.rd,
EX_MEM.shamt = obj.shamt, EX_MEM.value = obj.value, EX_MEM.addr = obj.addr, EX_MEM.type = obj.type,
EX_MEM.inspc = obj.inspc, EX_MEM.imm = obj.imm;
}
void MEM(instcode obj) {
if (obj.type == LB || obj.type == LH || obj.type == LW || obj.type == LBU || obj.type == LHU || obj.type == SB || obj.type == SH || obj.type == SW) {
++memcnt;
if (memcnt % 3) {
ifmem = true;
return;
}
else ifmem = false;
}
switch(obj.type) {
case LB:
obj.value = *((int8_t*)(memory + obj.addr));
break;
case LH:
obj.value = *((int16_t*)(memory + obj.addr));
break;
case LW:
obj.value = *((int32_t *)(memory + obj.addr));
break;
case LBU:
obj.value = *((uint8_t*)(memory + obj.addr));
break;
case LHU:
obj.value = *((uint16_t*)(memory + obj.addr));
break;
case SB:
memcpy(memory + obj.addr, ®i[obj.rs2], 1);
break;
case SH:
memcpy(memory + obj.addr, ®i[obj.rs2], 2);
break;
case SW:
memcpy(memory + obj.addr, ®i[obj.rs2], 4);
break;
default:
break;
}
MEM_WB = obj;
}
void WB(instcode obj) {
switch (obj.type) {
case LB:
case LH:
case LW:
case LBU:
case LHU:
case ADD:
case ADDI:
case SUB:
case LUI:
case AUIPC:
case XOR:
case XORI:
case OR:
case ORI:
case AND:
case ANDI:
case SLL:
case SLLI:
case SRL:
case SRLI:
case SRA:
case SRAI:
case SLT:
case SLTI:
case SLTU:
case SLTIU:
case JAL:
case JALR:
if (obj.rd != 0) regi[obj.rd] = obj.value;
break;
default:
break;
}
}
#endif //RISC_V_SIMULATOR_RISCV_HPP