288 lines
6.3 KiB
C++
288 lines
6.3 KiB
C++
/*!
|
|
\file M_extension.h
|
|
\brief Implement M extensions part of the RISC-V
|
|
\author Màrius Montón
|
|
\date November 2018
|
|
*/
|
|
// SPDX-License-Identifier: GPL-3.0-or-later
|
|
|
|
#include "M_extension.h"
|
|
|
|
op_M_Codes M_extension::decode() const {
|
|
|
|
switch (opcode()) {
|
|
case M_MUL:
|
|
return OP_M_MUL;
|
|
break;
|
|
case M_MULH:
|
|
return OP_M_MULH;
|
|
break;
|
|
case M_MULHSU:
|
|
return OP_M_MULHSU;
|
|
break;
|
|
case M_MULHU:
|
|
return OP_M_MULHU;
|
|
break;
|
|
case M_DIV:
|
|
return OP_M_DIV;
|
|
break;
|
|
case M_DIVU:
|
|
return OP_M_DIVU;
|
|
break;
|
|
case M_REM:
|
|
return OP_M_REM;
|
|
break;
|
|
case M_REMU:
|
|
return OP_M_REMU;
|
|
break;
|
|
[[unlikely]] default:
|
|
return OP_M_ERROR;
|
|
break;
|
|
}
|
|
|
|
return OP_M_ERROR;
|
|
}
|
|
|
|
bool M_extension::Exec_M_MUL() const {
|
|
int rd, rs1, rs2;
|
|
std::int32_t multiplier, multiplicand;
|
|
std::int64_t result;
|
|
|
|
rd = get_rd();
|
|
rs1 = get_rs1();
|
|
rs2 = get_rs2();
|
|
|
|
multiplier = static_cast<std::int32_t>(regs->getValue(rs1));
|
|
multiplicand = static_cast<std::int32_t>(regs->getValue(rs2));
|
|
|
|
result = static_cast<std::int64_t>(multiplier * multiplicand);
|
|
result = result & 0x00000000FFFFFFFF;
|
|
regs->setValue(rd, static_cast<std::int32_t>(result));
|
|
|
|
log->SC_log(Log::INFO) << std::dec << "MUL: x" << rs1 << " * x" << rs2
|
|
<< " -> x" << rd << "(" << result << ")" << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
bool M_extension::Exec_M_MULH() const {
|
|
int rd, rs1, rs2;
|
|
std::int32_t multiplier, multiplicand;
|
|
std::int64_t result;
|
|
std::int32_t ret_value;
|
|
|
|
rd = get_rd();
|
|
rs1 = get_rs1();
|
|
rs2 = get_rs2();
|
|
|
|
multiplier = static_cast<std::int32_t>(regs->getValue(rs1));
|
|
multiplicand = static_cast<std::int32_t>(regs->getValue(rs2));
|
|
|
|
result = static_cast<std::int64_t>(multiplier) * static_cast<std::int64_t>(multiplicand);
|
|
|
|
ret_value = static_cast<std::int32_t>((result >> 32) & 0x00000000FFFFFFFF);
|
|
regs->setValue(rd, ret_value);
|
|
|
|
log->SC_log(Log::INFO) << std::dec << "MULH: x" << rs1 << " * x" << rs2
|
|
<< " -> x" << rd << "(" << result << ")" << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
bool M_extension::Exec_M_MULHSU() const {
|
|
int rd, rs1, rs2;
|
|
std::int32_t multiplier;
|
|
std::uint32_t multiplicand;
|
|
std::int64_t result;
|
|
|
|
rd = get_rd();
|
|
rs1 = get_rs1();
|
|
rs2 = get_rs2();
|
|
|
|
multiplier = static_cast<std::int32_t>(regs->getValue(rs1));
|
|
multiplicand = regs->getValue(rs2);
|
|
|
|
result = static_cast<std::int64_t>(multiplier * static_cast<std::uint64_t>(multiplicand));
|
|
result = (result >> 32) & 0x00000000FFFFFFFF;
|
|
regs->setValue(rd, static_cast<std::int32_t>(result));
|
|
|
|
log->SC_log(Log::INFO) << std::dec << "MULHSU: x" << rs1 << " * x" << rs2
|
|
<< " -> x" << rd << "(" << result << ")" << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
bool M_extension::Exec_M_MULHU() const {
|
|
int rd, rs1, rs2;
|
|
std::uint32_t multiplier, multiplicand;
|
|
std::uint64_t result;
|
|
std::int32_t ret_value;
|
|
|
|
rd = get_rd();
|
|
rs1 = get_rs1();
|
|
rs2 = get_rs2();
|
|
|
|
multiplier = static_cast<std::int32_t>(regs->getValue(rs1));
|
|
multiplicand = static_cast<std::int32_t>(regs->getValue(rs2));
|
|
|
|
result = static_cast<std::uint64_t>(multiplier) * static_cast<std::uint64_t>(multiplicand);
|
|
ret_value = static_cast<std::int32_t>((result >> 32) & 0x00000000FFFFFFFF);
|
|
regs->setValue(rd, ret_value);
|
|
|
|
log->SC_log(Log::INFO) << std::dec << "MULHU: x" << rs1 << " * x" << rs2
|
|
<< " -> x" << rd << "(" << ret_value << ")" << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
bool M_extension::Exec_M_DIV() const {
|
|
int rd, rs1, rs2;
|
|
std::int32_t divisor, dividend;
|
|
std::int64_t result;
|
|
|
|
rd = get_rd();
|
|
rs1 = get_rs1();
|
|
rs2 = get_rs2();
|
|
|
|
dividend = static_cast<std::int32_t>(regs->getValue(rs1));
|
|
divisor = static_cast<std::int32_t>(regs->getValue(rs2));
|
|
|
|
if (divisor == 0) {
|
|
result = -1;
|
|
} else if ((divisor == -1) && (dividend == static_cast<std::int32_t>(0x80000000)) ) {
|
|
result = 0x0000000080000000;
|
|
} else {
|
|
result = dividend / divisor;
|
|
result = result & 0x00000000FFFFFFFF;
|
|
}
|
|
|
|
regs->setValue(rd, static_cast<std::int32_t>(result));
|
|
|
|
log->SC_log(Log::INFO) << std::dec << "DIV: x" << rs1 << " / x" << rs2
|
|
<< " -> x" << rd << "(" << result << ")" << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
bool M_extension::Exec_M_DIVU() const {
|
|
int rd, rs1, rs2;
|
|
std::uint32_t divisor, dividend;
|
|
std::uint64_t result;
|
|
|
|
rd = get_rd();
|
|
rs1 = get_rs1();
|
|
rs2 = get_rs2();
|
|
|
|
dividend = regs->getValue(rs1);
|
|
divisor = regs->getValue(rs2);
|
|
|
|
if (divisor == 0) {
|
|
result = -1;
|
|
} else {
|
|
result = dividend / divisor;
|
|
result = result & 0x00000000FFFFFFFF;
|
|
}
|
|
|
|
regs->setValue(rd, static_cast<std::int32_t>(result));
|
|
|
|
log->SC_log(Log::INFO) << std::dec << "DIVU: x" << rs1 << " / x" << rs2
|
|
<< " -> x" << rd << "(" << result << ")" << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
bool M_extension::Exec_M_REM() const {
|
|
int rd, rs1, rs2;
|
|
std::int32_t divisor, dividend;
|
|
std::int32_t result;
|
|
|
|
rd = get_rd();
|
|
rs1 = get_rs1();
|
|
rs2 = get_rs2();
|
|
|
|
dividend = static_cast<std::int32_t>(regs->getValue(rs1));
|
|
divisor = static_cast<std::int32_t>(regs->getValue(rs2));
|
|
|
|
if (divisor == 0) {
|
|
result = dividend;
|
|
} else if ((divisor == -1) && (dividend == static_cast<std::int32_t>(0x80000000)) ) {
|
|
result = 0;
|
|
} else {
|
|
result = dividend % divisor;
|
|
}
|
|
|
|
regs->setValue(rd, result);
|
|
|
|
log->SC_log(Log::INFO) << std::dec << "REM: x" << rs1 << " / x" << rs2
|
|
<< " -> x" << rd << "(" << result << ")" << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
bool M_extension::Exec_M_REMU() const {
|
|
int rd, rs1, rs2;
|
|
std::uint32_t divisor, dividend;
|
|
std::uint32_t result;
|
|
|
|
rd = get_rd();
|
|
rs1 = get_rs1();
|
|
rs2 = get_rs2();
|
|
|
|
dividend = static_cast<std::int32_t>(regs->getValue(rs1));
|
|
divisor = static_cast<std::int32_t>(regs->getValue(rs2));
|
|
|
|
if (divisor == 0) {
|
|
result = dividend;
|
|
} else {
|
|
result = dividend % divisor;
|
|
}
|
|
|
|
regs->setValue(rd, static_cast<std::int32_t>(result));
|
|
|
|
log->SC_log(Log::INFO) << std::dec << "REMU: x" << rs1 << " / x" << rs2
|
|
<< " -> x" << rd << "(" << result << ")" << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
bool M_extension::process_instruction(Instruction &inst) {
|
|
bool PC_not_affected = true;
|
|
|
|
setInstr(inst.getInstr());
|
|
|
|
switch (decode()) {
|
|
case OP_M_MUL:
|
|
Exec_M_MUL();
|
|
break;
|
|
case OP_M_MULH:
|
|
Exec_M_MULH();
|
|
break;
|
|
case OP_M_MULHSU:
|
|
Exec_M_MULHSU();
|
|
break;
|
|
case OP_M_MULHU:
|
|
Exec_M_MULHU();
|
|
break;
|
|
case OP_M_DIV:
|
|
Exec_M_DIV();
|
|
break;
|
|
case OP_M_DIVU:
|
|
Exec_M_DIVU();
|
|
break;
|
|
case OP_M_REM:
|
|
Exec_M_REM();
|
|
break;
|
|
case OP_M_REMU:
|
|
Exec_M_REMU();
|
|
break;
|
|
[[unlikely]] default:
|
|
std::cout << "M instruction not implemented yet" << "\n";
|
|
inst.dump();
|
|
//NOP(inst);
|
|
sc_core::sc_stop();
|
|
break;
|
|
}
|
|
|
|
return PC_not_affected;
|
|
}
|