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+// Simulator for the RISC-V[ECTOR] mini-ISA
+// Copyright (C) 2025 Siddarth Suresh
+// Copyright (C) 2025 bdunahu
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+#include "ex.h"
+#include "instrDTO.h"
+#include "pipe_spec.h"
+#include "response.h"
+#include "stage.h"
+#include <unordered_map>
+
+// clang-format off
+#define INIT_INSTRUCTION(mnemonic, body) \
+ {mnemonic, [this](signed int &s1, signed int s2, signed int s3, unsigned int pc) { \
+ body; \
+ }}
+// clang-format on
+
+EX::EX(Stage *stage) : Stage(stage)
+{
+ instr_map = {
+
+ /* R type instructions */
+ INIT_INSTRUCTION(
+ ADD,
+ {
+ this->set_condition(OF, ADDITION_OF_GUARD(s1, s2));
+ this->set_condition(UF, ADDITION_UF_GUARD(s1, s2));
+ s1 = s1 + s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ SUB,
+ {
+ this->set_condition(OF, SUBTRACTION_OF_GUARD(s1, s2));
+ this->set_condition(UF, SUBTRACTION_UF_GUARD(s1, s2));
+ s1 = s1 - s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ MUL,
+ {
+ this->set_condition(OF, MULTIPLICATION_OF_GUARD(s1, s2));
+ this->set_condition(UF, MULTIPLICATION_UF_GUARD(s1, s2));
+ s1 = s1 * s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ QUOT,
+ {
+ this->handle_divide(s1, s2, false);
+ (void)pc;
+ (void)s3;
+ }),
+
+ INIT_INSTRUCTION(
+ REM,
+ {
+ this->handle_divide(s1, s2, true);
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ SFTR,
+ {
+ s1 = s1 >> s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ SFTL,
+ {
+ s1 = s1 << s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ AND,
+ {
+ this->set_condition(OF, false);
+ this->set_condition(UF, false);
+ s1 = s1 & s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ OR,
+ {
+ this->set_condition(OF, false);
+ this->set_condition(UF, false);
+ s1 = s1 | s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ NOT,
+ {
+ this->set_condition(OF, false);
+ this->set_condition(UF, false);
+ s1 = ~s1;
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ XOR,
+ {
+ this->set_condition(OF, false);
+ this->set_condition(UF, false);
+ s1 = s1 ^ s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ ADDV,
+ {
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)s1;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ SUBV,
+ {
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)s1;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ MULV,
+ {
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)s1;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ DIVV,
+ {
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)s1;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ CMP,
+ {
+ (s1 > s2) ? this->set_condition(GT, true)
+ : this->set_condition(GT, false);
+ (s1 == s2) ? this->set_condition(EQ, true)
+ : this->set_condition(EQ, false);
+ (void)pc;
+ (void)s3;
+ }),
+
+ INIT_INSTRUCTION(
+ CEV,
+ {
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)s1;
+ (void)this;
+ }),
+
+ /* I type instructions */
+ INIT_INSTRUCTION(
+ LOAD,
+ {
+ s1 = s1 + s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ LOADV,
+ {
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)s1;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ ADDI,
+ {
+ this->set_condition(OF, ADDITION_OF_GUARD(s1, s3));
+ this->set_condition(UF, ADDITION_UF_GUARD(s1, s3));
+ s1 = s1 + s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ SUBI,
+ {
+ this->set_condition(OF, SUBTRACTION_OF_GUARD(s1, s3));
+ this->set_condition(UF, SUBTRACTION_UF_GUARD(s1, s3));
+ s1 = s1 - s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ SFTRI,
+ {
+ s1 = s1 >> s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ SFTLI,
+ {
+ s1 = s1 << s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ ANDI,
+ {
+ this->set_condition(OF, false);
+ this->set_condition(UF, false);
+ s1 = s1 & s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ ORI,
+ {
+ this->set_condition(OF, false);
+ this->set_condition(UF, false);
+ s1 = s1 | s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ XORI,
+ {
+ this->set_condition(OF, false);
+ this->set_condition(UF, false);
+ s1 = s1 ^ s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ STORE,
+ {
+ s1 = s1 + s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ STOREV,
+ {
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)s1;
+ (void)this;
+ }),
+
+ /* J type instructions */
+ INIT_INSTRUCTION(
+ JMP,
+ {
+ s1 = s1 + s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ JRL,
+ {
+ s1 = pc + s2;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ JAL,
+ {
+ s1 = s1 + s2;
+ (void)pc;
+ (void)s3;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ BEQ,
+ {
+ (this->get_condition(EQ)) ? s1 = pc + s2 : s1 = -1;
+ (void)s3;
+ }),
+
+ INIT_INSTRUCTION(
+ BGT,
+ {
+ (this->get_condition(GT)) ? s1 = pc + s2 : s1 = -1;
+ (void)s3;
+ }),
+
+ INIT_INSTRUCTION(
+ BUF,
+ {
+ (this->get_condition(UF)) ? s1 = pc + s2 : s1 = -1;
+ (void)s3;
+ }),
+
+ INIT_INSTRUCTION(
+ BOF,
+ {
+ (this->get_condition(OF)) ? s1 = pc + s2 : s1 = -1;
+ (void)s3;
+ }),
+
+ INIT_INSTRUCTION(
+ PUSH,
+ {
+ s1 = s1 + s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ POP,
+ {
+ s1 = s1 + s3;
+ (void)pc;
+ (void)s2;
+ (void)this;
+ }),
+
+ INIT_INSTRUCTION(
+ RET,
+ {
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)s1;
+ (void)this;
+ }),
+
+ /* NOP */
+ INIT_INSTRUCTION(
+ NOP,
+ {
+ (void)pc;
+ (void)s3;
+ (void)s2;
+ (void)s1;
+ (void)this;
+ }),
+ };
+}
+
+void EX::advance_helper()
+{
+ signed int s1, s2, s3;
+ unsigned int pc;
+ Mnemonic m;
+
+ m = this->curr_instr->mnemonic;
+ s1 = this->curr_instr->operands.integer.slot_one;
+ s2 = this->curr_instr->operands.integer.slot_two;
+ s3 = this->curr_instr->operands.integer.slot_three;
+ pc = this->curr_instr->slot_B;
+
+ this->instr_map[m](s1, s2, s3, pc);
+
+ this->curr_instr->operands.integer.slot_one = s1;
+ this->status = OK;
+}
+
+void EX::handle_divide(signed int &s1, signed int s2, bool is_mod)
+{
+ this->set_condition(OF, DIVISION_OF_GUARD(s1, s2));
+ this->set_condition(UF, false);
+ if (s2 == 0) {
+ // handle everything here
+ this->curr_instr->operands.integer.slot_one = MAX_INT;
+ this->status = OK;
+ throw HaltException();
+ } else if ((s1 == -(MAX_INT)-1) && s2 == -1) {
+ // undefined in C++
+ s1 = -(MAX_INT)-1;
+ } else {
+ s1 = (is_mod) ? (s1 % s2) : (s1 / s2);
+ }
+}
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