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rvsim.cpp
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#include <iostream>
#include <fstream>
#include "stdlib.h"
#include <iomanip>
#include <cstdint>
#include <bitset>
#include <vector>
using namespace std;
unsigned int pc = 0;
unsigned char memory[(16 + 64) * 1024] = {0};
unsigned int reg[32] = {0};
string name[32] = {"zero", "ra", "sp", "gp", "tp", "t0", "t1", "t2", "s0", "s1", "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "s2", "s3", "s4", "s5", "s6", "s7", "s8", "s9", "s10", "s11", "t3", "t4", "t5", "t6"};
vector<unsigned int> symbol_table;
int instCount = 0;
bool isSWSP = false;
bool isAddi4spn = false;
bool isAddI16SP = false;
bool isNop = false;
string filename;
void emitError(const char *s)
{
cout << s;
exit(0);
}
void printPrefix(unsigned int instA, unsigned int instW)
{
cout << "0x" << hex << std::setfill('0') << std::setw(8) << instA << "\t0x" << std::setw(8) << instW;
}
void printRegisterValues()
{
cout << "\n\nRegister Values:\n";
for (int i = 0; i < 32; i++)
cout << name[i] << " = 0x" << hex << reg[i] << endl;
cout << "pc = 0x" << hex << pc << endl;
}
void printMemoryValues()
{
cout << "\n\n\n";
for (int i = 0; i < (16 + 64) * 1024; i++)
{
if (memory[i] != 0)
cout << "memory[" << i << "] = " << hex << (int)memory[i] << endl;
}
cout << "\n\n\n";
}
unsigned int decompress(unsigned int instWord)
{
unsigned int rd, rs1_dash, rs2_dash, rd_dash, rs2, funct4, funct3, opcode;
unsigned int CS_imm, CS_imm_v2, CL_imm, JAL_Imm, CI_imm;
unsigned int instPC = pc - 2;
opcode = (instWord & 0x00000003);
rs2 = ((instWord >> 2) & 0x0000001F);
rd = ((instWord >> 7) & 0x0000001F);
funct4 = ((instWord >> 12) & 0x0000000F);
funct3 = ((instWord >> 13) & 0x00000007);
rs1_dash = ((instWord >> 7) & 0x00000007);
rs2_dash = ((instWord >> 2) & 0x00000007);
rd_dash = ((instWord >> 2) & 0x00000007);
rd_dash = rd_dash + 0b1000;
rs1_dash = rs1_dash + 0b1000;
rs2_dash = rs2_dash + 0b1000;
CI_imm = (instWord >> 2);
CI_imm = (CI_imm & 0x001F);
CI_imm = CI_imm + ((instWord >> 7) & 0x0020);
if (CI_imm & 0x0010)
{
CI_imm = CI_imm | 0xFFFFFFF0;
}
CS_imm = (instWord >> 5) & 0x00000001;
CS_imm = CS_imm << 3;
CS_imm = CS_imm + ((instWord >> 10) & 0x00000007);
CS_imm = CS_imm << 1;
CS_imm = CS_imm + ((instWord >> 6) & 0x00000001);
CS_imm = CS_imm << 2;
CS_imm_v2 = (instWord >> 10) & 0x00000007;
CS_imm_v2 = CS_imm_v2 << 2;
CS_imm_v2 = CS_imm_v2 + ((instWord >> 5) & 0x00000003);
CL_imm = (instWord >> 5) & 0x00000001;
CL_imm = CL_imm << 3;
CL_imm = CL_imm + ((instWord >> 10) & 0x00000007);
CL_imm = CL_imm << 1;
CL_imm = CL_imm + ((instWord >> 6) & 0x00000001);
CL_imm = CL_imm << 2;
// Extract J-Immediate
JAL_Imm = ((instWord >> 12) & 0x0001);
JAL_Imm = JAL_Imm << 1;
JAL_Imm = JAL_Imm + ((instWord >> 8) & 0x0001);
JAL_Imm = JAL_Imm << 2;
JAL_Imm = JAL_Imm + ((instWord >> 9) & 0x0003);
JAL_Imm = JAL_Imm << 1;
JAL_Imm = JAL_Imm + ((instWord >> 6) & 0x0001);
JAL_Imm = JAL_Imm << 1;
JAL_Imm = JAL_Imm + ((instWord >> 7) & 0x0001);
JAL_Imm = JAL_Imm << 1;
JAL_Imm = JAL_Imm + ((instWord >> 2) & 0x0001);
JAL_Imm = JAL_Imm << 1;
JAL_Imm = JAL_Imm + ((instWord >> 11) & 0x0001);
JAL_Imm = JAL_Imm << 3;
JAL_Imm = JAL_Imm + ((instWord >> 3) & 0x0007);
JAL_Imm = JAL_Imm << 1;
// Extract CB Immeidate for C.BEQZ and C.BNEZ
unsigned int CB_Imm;
CB_Imm = instWord >> 12;
CB_Imm = CB_Imm & 0x0001; // 00000008
CB_Imm = CB_Imm << 2; // 00000800
CB_Imm = CB_Imm + ((instWord >> 5) & 0x0003); // 00000876
CB_Imm = CB_Imm << 1; // 00008760
CB_Imm = CB_Imm + ((instWord >> 2) & 0x0001); // 00008765
CB_Imm = CB_Imm << 2; // 00876500
CB_Imm = CB_Imm + ((instWord >> 10) & 0x0003); // 00876543
CB_Imm = CB_Imm << 2; // 87654300
CB_Imm = CB_Imm + ((instWord >> 3) & 0x0003); // 00876543
CB_Imm = CB_Imm << 1;
if (CB_Imm >> 8 == 1)
{
CB_Imm = CB_Imm | 0b1111000000000;
}
else
{
CB_Imm = CB_Imm | 0b0000000000000;
}
int MSF;
printPrefix(instPC, instWord);
unsigned int instWord_Decompressed = 0;
if (opcode == 0x2)
{
// CR Format
switch (funct4)
{
case 0x9:
{
if (rd != 0 && rs2 != 0)
{
// C.ADD --------> ADD
instWord_Decompressed = 0b0000000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs2;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0110011;
return instWord_Decompressed;
}
else if (rd != 0 && rs2 == 0)
{
// C.JALR -------> JALR
instWord_Decompressed = 0b000000000000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + 0b00001;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b1100111;
return instWord_Decompressed;
}
break;
}
case 0x8:
{
if (rd != 0 && rs2 == 0)
{
// C.JR ------> JALR
instWord_Decompressed = 0b000000000000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + 0b00000;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b1100111;
return instWord_Decompressed;
}
else if (rd != 0 && rs2 != 0)
{
// C.MV ------> ADD
instWord_Decompressed = 0b0000000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs2;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + 0b00000;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0110011;
return instWord_Decompressed;
}
break;
}
}
switch (funct3)
{
case 0x0:
{
int CI_imm = instWord >> 2; // C.slli
CI_imm = (CI_imm & 0x001F);
CI_imm = CI_imm + ((instWord >> 7) & 0x0020);
if (CI_imm >> 5)
CI_imm = CI_imm | 0xFC0;
else
CI_imm = CI_imm | 0x0;
if (rd != 0)
instWord_Decompressed = 0x0;
opcode = 0x13;
funct3 = 0x1;
rd = instWord >> 7;
rd = (rd & 0x001F);
instWord_Decompressed = CI_imm << 20;
instWord_Decompressed = instWord_Decompressed + (rd << 15);
instWord_Decompressed = instWord_Decompressed + (funct3 << 12);
instWord_Decompressed = instWord_Decompressed + (rd << 7);
instWord_Decompressed = instWord_Decompressed + opcode;
return instWord_Decompressed;
break;
}
case 0x2: // C.LWSP
{
unsigned int CILW_imm = instWord >> 2;
CILW_imm = (CILW_imm & 0x0003); // 00076
CILW_imm = CILW_imm << 1; // 00760
CILW_imm = CILW_imm + ((instWord >> 11) & 0x0001); // 00765
CILW_imm = CILW_imm << 2; // 87600
CILW_imm = CILW_imm + ((instWord >> 4) & 0x0007); // 87654
CILW_imm = CILW_imm << 2;
int I_rd = instWord >> 7;
I_rd &= 0x001F;
instWord_Decompressed = 0x0;
if (I_rd != 0)
{
opcode = 0x03;
funct3 = 0x2;
instWord_Decompressed = CILW_imm << 20;
instWord_Decompressed = instWord_Decompressed + (0x2 << 15);
instWord_Decompressed = instWord_Decompressed + (funct3 << 12);
instWord_Decompressed = instWord_Decompressed + (rd << 7);
instWord_Decompressed = instWord_Decompressed + opcode;
return instWord_Decompressed;
}
cout << "\nError?\n"; // debugging
return instWord_Decompressed;
break;
}
case 0x6:
{
// C.SWSP
isSWSP = true;
unsigned int opcode = 0;
unsigned int rs2 = 0;
unsigned int CSS_imm = 0;
instWord_Decompressed = 0;
opcode = 0b0100011;
rs2 = ((instWord >> 2) & 0b11111);
CSS_imm = ((instWord >> 8) & 0b1) << 7;
CSS_imm |= ((instWord >> 7) & 0b1) << 6;
CSS_imm |= ((instWord >> 9) & 0b1111) << 2;
if (CSS_imm >> 7)
CSS_imm |= 0xFFFFFF00;
else
CSS_imm &= 0x000000FF;
funct3 = ((instWord >> 13) & 0b111);
instWord_Decompressed = (opcode & 0b1111111);
instWord_Decompressed |= ((CSS_imm & 0b11111) << 7);
instWord_Decompressed |= ((0b010) << 12);
instWord_Decompressed |= ((0b010) << 15);
instWord_Decompressed |= (rs2 << 20);
instWord_Decompressed |= ((CSS_imm & 0b111111100000) << 20);
return instWord_Decompressed;
break;
}
}
}
else if (opcode == 0x0)
{
switch (funct3)
{
case 0x0: // addi4spn
{
unsigned int CIW_Imm = 0;
CIW_Imm = ((instWord >> 7) & 0b0000000000000111);
CIW_Imm = CIW_Imm << 2;
CIW_Imm = CIW_Imm + ((instWord >> 11) & 0b0000000000000011);
CIW_Imm = CIW_Imm << 1;
CIW_Imm = CIW_Imm + ((instWord >> 5) & 0b0000000000000001);
CIW_Imm = CIW_Imm << 1;
CIW_Imm = CIW_Imm + ((instWord >> 6) & 0b0000000000000001);
CIW_Imm = CIW_Imm << 2;
CIW_Imm = CIW_Imm | 0b000000000000;
instWord_Decompressed = CIW_Imm;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + 0b00010;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd_dash;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0010011;
isAddi4spn = true;
return instWord_Decompressed;
break;
}
case 0x6:
{
// C.SW
MSF = ((instWord >> 5) & 0x00000001);
if (MSF == 1)
{
instWord_Decompressed = 0b1111111;
}
else if (MSF == 0)
{
instWord_Decompressed = 0b0000000;
}
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs2_dash;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b010;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + CS_imm;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0100011;
return instWord_Decompressed;
break;
}
case 0x2:
{
// C.LW
MSF = ((instWord >> 5) & 0x00000001);
if (MSF == 1)
{
instWord_Decompressed = 0b1111111;
}
else if (MSF == 0)
{
instWord_Decompressed = 0b0000000;
}
instWord_Decompressed = instWord_Decompressed + CL_imm;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b010;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd_dash;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0000011;
return instWord_Decompressed;
break;
}
}
}
else if (opcode == 0x1)
{
switch (funct3)
{
case 0x0:
{
if (rd == 0)
{
// C.NOP
instWord_Decompressed = 0b00000000000000000000000000010011;
isNop = true;
return instWord_Decompressed;
}
else
{
// C.ADDI
int I_rd = instWord >> 7;
I_rd &= 0x001F;
int CI_imm = instWord >> 2;
CI_imm = (CI_imm & 0x001F);
CI_imm = CI_imm + ((instWord >> 7) & 0x0020);
if (CI_imm >> 5)
{
CI_imm = CI_imm | 0xFC0;
}
else
{
CI_imm = CI_imm | 0x0;
}
instWord_Decompressed = 0x0;
opcode = 0x13;
funct3 = 0x0;
rd = instWord >> 7;
rd = (rd & 0x001F);
instWord_Decompressed = CI_imm << 20;
instWord_Decompressed = instWord_Decompressed + (rd << 15);
instWord_Decompressed = instWord_Decompressed + (funct3 << 12);
instWord_Decompressed = instWord_Decompressed + (rd << 7);
instWord_Decompressed = instWord_Decompressed + opcode;
return instWord_Decompressed;
}
break;
}
case 0x4:
{
if (CS_imm_v2 == 0b01111)
{
// C.AND
instWord_Decompressed = 0b0000000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs2_dash;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b111;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0110011;
return instWord_Decompressed;
}
else if (CS_imm_v2 == 0b01110)
{
// C.OR
instWord_Decompressed = 0b0000000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs2_dash;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b110;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0110011;
return instWord_Decompressed;
}
else if (CS_imm_v2 == 0b01101)
{
// C.XOR
instWord_Decompressed = 0b0000000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs2_dash;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b100;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0110011;
return instWord_Decompressed;
}
else if (CS_imm_v2 == 0b01100)
{
// C.SUB
instWord_Decompressed = 0b00100000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs2_dash;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0110011;
return instWord_Decompressed;
}
else if ((((instWord >> 10) & 0b11) == 0) && ((instWord >> 12) & 1) == 0) // C.SRLI
{
opcode = 0x13;
funct3 = 0x5;
rd = ((instWord >> 7) & 0b111);
rd += 8;
CS_imm_v2 = ((instWord >> 2) & 0b1111);
instWord_Decompressed = (CS_imm_v2 << 20);
instWord_Decompressed |= (rd << 15);
instWord_Decompressed |= (funct3 << 12);
instWord_Decompressed |= (rd << 7);
instWord_Decompressed |= opcode;
return instWord_Decompressed;
}
else if ((((instWord >> 10) & 0b11) == 0b10))
{
// C.ANDI
CS_imm_v2 = ((instWord >> 12) & 0b1) << 5;
CS_imm_v2 |= ((instWord >> 2) & 0b11111);
instWord_Decompressed = 0b0000000;
instWord_Decompressed = (instWord_Decompressed << 5);
instWord_Decompressed = instWord_Decompressed + CS_imm_v2;
instWord_Decompressed = (instWord_Decompressed << 5);
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = (instWord_Decompressed << 3);
instWord_Decompressed = instWord_Decompressed + 0b111;
instWord_Decompressed = (instWord_Decompressed << 5);
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = (instWord_Decompressed << 7);
instWord_Decompressed = instWord_Decompressed + 0b0010011;
return instWord_Decompressed;
}
else if (rd != 0) // C.SRAI
instWord_Decompressed = 0x0;
opcode = 0x13;
funct3 = 0x5;
rd = ((instWord >> 7) & 0x001F);
instWord_Decompressed = CI_imm << 20;
instWord_Decompressed = instWord_Decompressed + (rd << 15);
instWord_Decompressed = instWord_Decompressed + (funct3 << 12);
instWord_Decompressed = instWord_Decompressed + (rd << 7);
instWord_Decompressed = instWord_Decompressed | 0x40000000;
instWord_Decompressed = instWord_Decompressed + opcode;
return instWord_Decompressed;
break;
}
case 0x1:
{
// C.JAL ------> JAL
if (JAL_Imm >> 11 == 1)
{
JAL_Imm = JAL_Imm | 0b111111111000000000000;
}
else
{
JAL_Imm = JAL_Imm | 0b000000000000000000000;
}
instWord_Decompressed = JAL_Imm >> 20;
instWord_Decompressed = instWord_Decompressed << 10;
instWord_Decompressed = instWord_Decompressed + ((JAL_Imm >> 1) & 0b000000000001111111111);
instWord_Decompressed = instWord_Decompressed << 1;
instWord_Decompressed = instWord_Decompressed + ((JAL_Imm >> 11) & 0b000000000000000000001);
instWord_Decompressed = instWord_Decompressed << 8;
instWord_Decompressed = instWord_Decompressed + ((JAL_Imm >> 12) & 0b000000000000011111111);
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + 0b00001;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b1101111;
return instWord_Decompressed;
break;
}
case 0x2: // C.LI -------> ADDI
{
int I_rd = instWord >> 7;
I_rd &= 0x001F;
int CI_imm = instWord >> 2;
CI_imm = (CI_imm & 0x001F);
CI_imm = CI_imm + ((instWord >> 7) & 0x0020);
if (CI_imm >> 5)
{
CI_imm = CI_imm | 0xFC0;
}
else
{
CI_imm = CI_imm | 0x0;
}
if (I_rd != 0)
{
instWord_Decompressed = 0x0;
opcode = 0x13;
funct3 = 0x0;
instWord_Decompressed = CI_imm << 20;
instWord_Decompressed = instWord_Decompressed + 0b00000;
instWord_Decompressed = instWord_Decompressed + (0x00 << 12);
instWord_Decompressed = instWord_Decompressed + (rd << 7);
instWord_Decompressed = instWord_Decompressed + opcode;
}
return instWord_Decompressed;
break;
}
case 0x3:
{
if (rd == 2)
{
// C.ADDI16SP
unsigned int CI16_imm = ((instWord >> 12) & 0b0000000000000001);
CI16_imm = CI16_imm << 2;
CI16_imm = CI16_imm + ((instWord >> 3) & 0b0000000000000011);
CI16_imm = CI16_imm << 1;
CI16_imm = CI16_imm + ((instWord >> 5) & 0b0000000000000001);
CI16_imm = CI16_imm << 1;
CI16_imm = CI16_imm + ((instWord >> 2) & 0b0000000000000001);
CI16_imm = CI16_imm << 1;
CI16_imm = CI16_imm + ((instWord >> 6) & 0b0000000000000001);
CI16_imm = CI16_imm << 4;
if (CI16_imm >> 9 == 1)
{
CI16_imm = (CI16_imm | 0b110000000000);
}
else
{
CI16_imm = (CI16_imm | 0b000000000000);
}
instWord_Decompressed = CI16_imm;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0010011;
isAddI16SP = true;
return instWord_Decompressed;
}
else
{
// C.LUI
unsigned int CI_imm_lui;
CI_imm_lui = ((instWord >> 12) & 0x1);
CI_imm_lui = CI_imm_lui << 5;
CI_imm_lui = CI_imm_lui + ((instWord >> 2) & 0b0000000000011111);
CI_imm_lui = CI_imm_lui << 12;
if (CI_imm_lui >> 17 == 1)
{
CI_imm_lui = (CI_imm_lui | 0b11111111111111000000000000000000);
}
else
{
CI_imm_lui = (CI_imm_lui | 0b00000000000000000000000000000000);
}
instWord_Decompressed = CI_imm_lui >> 12;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rd;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b0110111;
return instWord_Decompressed;
}
break;
}
case 0x5:
{
// C.J -------> JAL
if (JAL_Imm >> 11 == 1)
{
JAL_Imm = JAL_Imm | 0b111111111000000000000;
}
else
{
JAL_Imm = JAL_Imm | 0b000000000000000000000;
}
instWord_Decompressed = JAL_Imm >> 20;
instWord_Decompressed = instWord_Decompressed << 10;
instWord_Decompressed = instWord_Decompressed + ((JAL_Imm >> 1) & 0b000000000001111111111);
instWord_Decompressed = instWord_Decompressed << 1;
instWord_Decompressed = instWord_Decompressed + ((JAL_Imm >> 11) & 0b000000000000000000001);
instWord_Decompressed = instWord_Decompressed << 8;
instWord_Decompressed = instWord_Decompressed + ((JAL_Imm >> 12) & 0b000000000000011111111);
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + 0b00000;
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b1101111;
return instWord_Decompressed;
break;
}
case 0x6:
{
// C.BEQZ
instWord_Decompressed = ((CB_Imm >> 12) & 0x1);
instWord_Decompressed = instWord_Decompressed << 6;
instWord_Decompressed = instWord_Decompressed + ((CB_Imm >> 5) & 0b0000000111111);
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + 0b00000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b000;
instWord_Decompressed = instWord_Decompressed << 4;
instWord_Decompressed = instWord_Decompressed + ((CB_Imm >> 1) & 0b0000000001111);
instWord_Decompressed = instWord_Decompressed << 1;
instWord_Decompressed = instWord_Decompressed + ((CB_Imm >> 11) & 0b0000000000001);
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b1100011;
return instWord_Decompressed;
break;
}
case 0x7:
{
// C.BNEZ
instWord_Decompressed = ((CB_Imm >> 12) & 0x1);
instWord_Decompressed = instWord_Decompressed << 6;
instWord_Decompressed = instWord_Decompressed + ((CB_Imm >> 5) & 0b0000000111111);
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + 0b00000;
instWord_Decompressed = instWord_Decompressed << 5;
instWord_Decompressed = instWord_Decompressed + rs1_dash;
instWord_Decompressed = instWord_Decompressed << 3;
instWord_Decompressed = instWord_Decompressed + 0b001;
instWord_Decompressed = instWord_Decompressed << 4;
instWord_Decompressed = instWord_Decompressed + ((CB_Imm >> 1) & 0b0000000001111);
instWord_Decompressed = instWord_Decompressed << 1;
instWord_Decompressed = instWord_Decompressed + ((CB_Imm >> 11) & 0b0000000000001);
instWord_Decompressed = instWord_Decompressed << 7;
instWord_Decompressed = instWord_Decompressed + 0b1100011;
return instWord_Decompressed;
break;
}
}
}
return instWord_Decompressed;
}
void instDecExec(unsigned int instWord, bool isCompressed)
{
unsigned int rd, rs1, rs2, funct3, funct7, opcode;
// signed int I_imm, S_imm, B_imm, U_imm, J_imm;
unsigned int I_imm, S_imm, B_imm, U_imm, J_imm;
unsigned int address;
unsigned int instPC;
if (isCompressed == 0)
{
instPC = pc - 4;
}
else if (isCompressed == 1)
{
instPC = pc - 2;
}
opcode = instWord & 0x0000007F;
rd = ((instWord >> 7) & 0x0000001F);
funct3 = ((instWord >> 12) & 0x00000007);
rs1 = ((instWord >> 15) & 0x0000001F);
rs2 = ((instWord >> 20) & 0x0000001F);
funct7 = ((instWord >> 25) & 0x0000007F);
// reset
I_imm = 0;
S_imm = 0;
B_imm = 0;
U_imm = 0;
J_imm = 0;
// Extract I-Immediate
I_imm = ((instWord >> 20) & 0x7FF) | (((instWord >> 31) ? 0xFFFFF800 : 0x0));
// Extract S-Immediate
S_imm = (instWord >> 25);
S_imm <<= 5;
S_imm |= ((instWord >> 7) & 0b11111);
if (S_imm >> 11)
S_imm |= 0xFFFFF000;
// Extract B-Immediate
B_imm = ((instWord >> 31) << 12);
B_imm |= ((instWord & 0x80) << 4);
B_imm |= ((instWord & 0x7E000000) >> 20);
B_imm |= ((instWord & 0xF00) >> 7);
if (B_imm >> 12)
B_imm |= 0xFFFFF000;
// Extract U-Immediate
U_imm = (instWord >> 12);
U_imm = (U_imm << 12);
// Extract J-Immediate
J_imm = ((instWord >> 31) << 20);
J_imm |= (instWord & 0xFF000);
J_imm |= ((instWord & 0x100000) >> 9);
J_imm |= (((instWord & 0x7FE00000) >> 21) << 1);
if (J_imm >> 20)
J_imm |= 0xFFE00000;
if (!isCompressed)
{
printPrefix(instPC, instWord);
}
if (opcode == 0x33)
{ // R Instructions
switch (funct3)
{
case 0x0:
{
if (funct7 == 0x0)
{
// 1.ADD
if (isCompressed == 0)
{
cout << "\tADD\t" << name[rd] << ", " << name[rs1] << ", " << name[rs2] << "\n";
}
else if (isCompressed == 1)
{
if (rs1 == 0b00000)
{
cout << "\tC.MV\t" << name[rd] << ", " << name[rs2] << "\n";
}
else
{
cout << "\tC.ADD\t" << name[rd] << ", " << name[rs2] << "\n";
}
}
reg[rd] = reg[rs1] + reg[rs2];
}
else if (funct7 == 0x20)
{
// 2.SUB
if (isCompressed == 0)
{
cout << "\tSUB\t" << name[rd] << ", " << name[rs1] << ", " << name[rs2] << "\n";
}
else if (isCompressed == 1)
{
cout << "\tC.SUB\t" << name[rd] << ", " << name[rs2] << "\n";
}
// reg[rd] = reg[rs1] - reg[rs2]; // debugging: signed or unsigned?
reg[rd] = reg[rs1] - reg[rs2];
}
break;
}
case 0x4:
{
if (funct7 == 0x00)
{
// 3.XOR
if (isCompressed == 0)
{
cout << "\tXOR\t" << name[rd] << ", " << name[rs1] << ", " << name[rs2] << "\n";
}
else if (isCompressed == 1)
{
cout << "\tC.XOR\t" << name[rd] << ", " << name[rs2] << "\n";
}
reg[rd] = reg[rs1] ^ reg[rs2];
}
break;
}
case 0x6:
{
if (funct7 == 0x00)
{
// 4.OR
if (isCompressed == 0)
{
cout << "\tOR\t" << name[rd] << ", " << name[rs1] << ", " << name[rs2] << "\n";
}
if (isCompressed == 1)
{
cout << "\tC.OR\t" << name[rd] << ", " << name[rs2] << "\n";
}
reg[rd] = reg[rs1] | reg[rs2];
}
break;
}
case 0x7:
{
if (funct7 == 0x00)
{
// 5.AND
if (isCompressed == 0)