1 files changed, 0 insertions, 284 deletions
diff --git a/rv64cpu/tb/unit/tb_trap_ctrl.cc b/rv64cpu/tb/unit/tb_trap_ctrl.cc
deleted file mode 100644
index 62867df..0000000
--- a/rv64cpu/tb/unit/tb_trap_ctrl.cc
+++ /dev/null
@@ -1,284 +0,0 @@
-//     Richard CPU
-// Copyright (C) 2026  Richard Qin
-//
-// 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/>.
-
-// File path: tb/unit/tb_trap_ctrl.cc
-// Description: Standalone unit test for trap_ctrl exception/interrupt control logic
-
-#include <cassert>
-#include <cstdint>
-#include <iostream>
-#include <verilated.h>
-
-#include "Vtrap_ctrl.h"
-
-namespace {
-constexpr uint64_t EXC_INST_ILLEGAL   = 2ULL;
-constexpr uint64_t EXC_ECALL_FROM_S   = 9ULL;
-constexpr uint64_t EXC_LOAD_PAGE_FAULT= 13ULL;
-constexpr uint64_t EXC_STORE_PAGE_FAULT= 15ULL;
-constexpr uint64_t EXC_LOAD_FAULT     = 5ULL;
-constexpr uint64_t EXC_STORE_FAULT    = 7ULL;
-
-constexpr uint64_t INTERRUPT_M_SOFTWARE = 3ULL;
-constexpr uint64_t INTERRUPT_M_TIMER    = 7ULL;
-constexpr uint64_t INTERRUPT_M_EXTERNAL = 11ULL;
-constexpr uint64_t INTERRUPT_S_SOFTWARE = 1ULL;
-constexpr uint64_t INTERRUPT_S_TIMER    = 5ULL;
-constexpr uint64_t INTERRUPT_S_EXTERNAL = 9ULL;
-
-constexpr uint64_t INTERRUPT_BIT      = 1ULL << 63;
-constexpr uint64_t PRIV_MODE_U        = 0ULL;
-constexpr uint64_t PRIV_MODE_S        = 1ULL;
-constexpr uint64_t PRIV_MODE_M        = 3ULL;
-
-uint64_t mie_bit(uint64_t interrupt_cause) {
-    return 1ULL << interrupt_cause;
-}
-
-void drive_defaults(Vtrap_ctrl* dut) {
-    dut->wb_pc = 0;
-    dut->trap_illegal_instr = 0;
-    dut->trap_is_ecall = 0;
-    dut->trap_is_ebreak = 0;
-    dut->trap_is_mret = 0;
-    dut->trap_is_sret = 0;
-    dut->trap_load_fault = 0;
-    dut->trap_store_fault = 0;
-    dut->trap_instr_page_fault = 0;
-    dut->trap_load_page_fault = 0;
-    dut->trap_store_page_fault = 0;
-    dut->trap_bad_addr = 0;
-    dut->trap_bad_instr = 0;
-
-    dut->csr_mstatus_mie = 0;
-    dut->csr_mie = 0;
-    dut->csr_sie = 0;
-    dut->csr_mip = 0;
-    dut->csr_sip = 0;
-    dut->csr_mtvec = 0x800ULL;
-    dut->csr_stvec = 0x400ULL;
-    dut->csr_mepc = 0x1000ULL;
-    dut->csr_sepc = 0x2000ULL;
-    dut->csr_medeleg = 0ULL;
-    dut->csr_mideleg = 0ULL;
-    dut->csr_priv_mode = PRIV_MODE_M;
-
-    dut->eval();
-}
-
-int pass_count = 0;
-
-void check(bool cond, const char* name) {
-    if (cond) {
-        std::cout << "\033[32m[PASS] " << name << "\033[0m" << std::endl;
-        pass_count++;
-    } else {
-        std::cout << "\033[31m[FAIL] " << name << "\033[0m" << std::endl;
-        assert(false);
-    }
-}
-}  // namespace
-
-int main(int argc, char** argv) {
-    Verilated::commandArgs(argc, argv);
-    Vtrap_ctrl* dut = new Vtrap_ctrl;
-
-    std::cout << "----------------------------------\n";
-    std::cout << "        trap_ctrl Testbench\n";
-    std::cout << "----------------------------------\n";
-
-    // ---------------------------------------------------------------------
-    // 1) Synchronous exceptions (illegal instruction, ecall, page fault)
-    // ---------------------------------------------------------------------
-    drive_defaults(dut);
-    dut->csr_priv_mode = PRIV_MODE_M;
-    dut->csr_mtvec = 0x880ULL;
-    dut->wb_pc = 0x1234ULL;
-    dut->trap_bad_instr = 0xDEADBEEFu;
-    dut->trap_illegal_instr = 1;
-    dut->eval();
-    check(dut->trap_trigger, "IllegalInst_TriggersTrap");
-    check(dut->trap_mcause == EXC_INST_ILLEGAL, "IllegalInst_Mcause");
-    check(dut->trap_mtval == 0xDEADBEEFULL, "IllegalInst_Mtval");
-    check(dut->trap_mepc == 0x1234ULL, "IllegalInst_Mepc");
-    check(!dut->trap_to_s_mode, "IllegalInst_NoDelegation");
-    check(dut->trap_next_pc == 0x880ULL, "IllegalInst_JumpsToMtvec");
-
-    drive_defaults(dut);
-    dut->csr_priv_mode = PRIV_MODE_S;
-    dut->csr_mtvec = 0x440ULL;
-    dut->wb_pc = 0x5678ULL;
-    dut->trap_is_ecall = 1;
-    dut->eval();
-    check(dut->trap_trigger, "EcallS_TriggersTrap");
-    check(dut->trap_mcause == EXC_ECALL_FROM_S, "EcallS_Mcause");
-    check(dut->trap_mtval == 0ULL, "EcallS_MtvalZero");
-    check(dut->trap_next_pc == 0x440ULL, "EcallS_JumpsToMtvec");
-
-    drive_defaults(dut);
-    dut->trap_load_page_fault = 1;
-    dut->trap_bad_addr = 0xBADC0FFEE0ULL;
-    dut->eval();
-    check(dut->trap_mcause == EXC_LOAD_PAGE_FAULT, "LoadPageFault_Mcause");
-    check(dut->trap_mtval == 0xBADC0FFEE0ULL, "LoadPageFault_Mtval");
-
-    drive_defaults(dut);
-    dut->trap_store_page_fault = 1;
-    dut->trap_bad_addr = 0xDEADBEEF00ULL;
-    dut->eval();
-    check(dut->trap_mcause == EXC_STORE_PAGE_FAULT, "StorePageFault_Mcause");
-    check(dut->trap_mtval == 0xDEADBEEF00ULL, "StorePageFault_Mtval");
-
-    drive_defaults(dut);
-    dut->trap_load_fault = 1;
-    dut->trap_bad_addr = 0xABCDEF0010ULL;
-    dut->eval();
-    check(dut->trap_mcause == EXC_LOAD_FAULT, "LoadFault_Mcause");
-    check(dut->trap_mtval == 0xABCDEF0010ULL, "LoadFault_Mtval");
-
-    drive_defaults(dut);
-    dut->trap_store_fault = 1;
-    dut->trap_bad_addr = 0xABCDEF0020ULL;
-    dut->eval();
-    check(dut->trap_mcause == EXC_STORE_FAULT, "StoreFault_Mcause");
-    check(dut->trap_mtval == 0xABCDEF0020ULL, "StoreFault_Mtval");
-
-    // ---------------------------------------------------------------------
-    // 2) Interrupt priority + enable masking
-    // ---------------------------------------------------------------------
-    drive_defaults(dut);
-    dut->csr_mstatus_mie = 1;
-    dut->csr_mie = mie_bit(INTERRUPT_M_EXTERNAL) |
-                   mie_bit(INTERRUPT_M_SOFTWARE) |
-                   mie_bit(INTERRUPT_M_TIMER);
-    dut->csr_priv_mode = PRIV_MODE_M;
-    dut->csr_mtvec = 0x300ULL | 0x1ULL;  // vectored mode
-    dut->wb_pc = 0x4000ULL;
-    dut->csr_mip = mie_bit(INTERRUPT_M_EXTERNAL) |
-                   mie_bit(INTERRUPT_M_SOFTWARE) |
-                   mie_bit(INTERRUPT_M_TIMER);
-    dut->eval();
-    const uint64_t expected_vectored_pc = 0x300ULL + (INTERRUPT_M_EXTERNAL << 2);
-    check(dut->trap_trigger, "InterruptPriority_Triggers");
-    check(dut->trap_mcause == (INTERRUPT_BIT | INTERRUPT_M_EXTERNAL), "InterruptPriority_Mcause");
-    check(dut->trap_mtval == 0ULL, "InterruptPriority_MtvalZero");
-    check(dut->trap_next_pc == expected_vectored_pc, "InterruptPriority_VectoredJump");
-
-    drive_defaults(dut);
-    dut->csr_mstatus_mie = 0;
-    dut->csr_mie = mie_bit(INTERRUPT_M_EXTERNAL);
-    dut->csr_mip = mie_bit(INTERRUPT_M_EXTERNAL);
-    dut->eval();
-    check(!dut->trap_trigger, "InterruptMaskedByGlobalMie_NoTrigger");
-
-    drive_defaults(dut);
-    dut->csr_priv_mode = PRIV_MODE_M;
-    dut->csr_mstatus_mie = 1;
-    dut->csr_mie = 0;
-    dut->csr_mip = mie_bit(INTERRUPT_M_EXTERNAL);
-    dut->eval();
-    check(!dut->trap_trigger, "InterruptMaskedByMie_NoTrigger");
-
-    drive_defaults(dut);
-    dut->csr_priv_mode = PRIV_MODE_S;
-    dut->csr_mstatus_mie = 0;
-    dut->csr_mie = mie_bit(INTERRUPT_M_EXTERNAL);
-    dut->csr_mtvec = 0x440ULL;
-    dut->wb_pc = 0x6780ULL;
-    dut->csr_mip = mie_bit(INTERRUPT_M_EXTERNAL);
-    dut->eval();
-    check(dut->trap_trigger, "MachineInterruptBelowM_IgnoresMstatusMie");
-    check(!dut->trap_to_s_mode, "MachineInterruptBelowM_NoDelegationWithoutMideleg");
-    check(dut->trap_mcause == (INTERRUPT_BIT | INTERRUPT_M_EXTERNAL), "MachineInterruptBelowM_Mcause");
-    check(dut->trap_next_pc == 0x440ULL, "MachineInterruptBelowM_JumpsToMtvec");
-
-    drive_defaults(dut);
-    dut->csr_priv_mode = PRIV_MODE_S;
-    dut->csr_mstatus_mie = 1;
-    dut->csr_mie = mie_bit(INTERRUPT_M_TIMER);
-    dut->csr_mtvec = 0x880ULL | 0x1ULL;  // vectored machine mode
-    dut->csr_stvec = 0x400ULL | 0x1ULL;
-    dut->csr_mideleg = (1ULL << INTERRUPT_M_TIMER);
-    dut->wb_pc = 0xABCDULL;
-    dut->csr_mip = mie_bit(INTERRUPT_M_TIMER);
-    dut->eval();
-    const uint64_t expected_sv_pc = 0x880ULL + (INTERRUPT_M_TIMER << 2);
-    check(!dut->trap_to_s_mode, "MachineInterrupt_NoDelegation");
-    check(dut->trap_next_pc == expected_sv_pc, "MachineInterrupt_UsesMtvec");
-    check(dut->trap_mcause == (INTERRUPT_BIT | INTERRUPT_M_TIMER), "MachineInterrupt_Mcause");
-
-    drive_defaults(dut);
-    dut->csr_priv_mode = PRIV_MODE_S;
-    dut->csr_mstatus = (1ULL << 1);
-    dut->csr_sie = mie_bit(INTERRUPT_S_TIMER);
-    dut->csr_sip = mie_bit(INTERRUPT_S_TIMER);
-    dut->csr_mideleg = mie_bit(INTERRUPT_S_TIMER);
-    dut->csr_stvec = 0x900ULL | 0x1ULL;
-    dut->wb_pc = 0xABCEULL;
-    dut->eval();
-    const uint64_t expected_s_timer_pc = 0x900ULL + (INTERRUPT_S_TIMER << 2);
-    check(dut->trap_to_s_mode, "SupervisorInterruptDelegated_ToSupervisor");
-    check(dut->trap_next_pc == expected_s_timer_pc, "SupervisorInterruptDelegated_UsesStvec");
-    check(dut->trap_mcause == (INTERRUPT_BIT | INTERRUPT_S_TIMER), "SupervisorInterruptDelegated_Mcause");
-
-    drive_defaults(dut);
-    dut->csr_priv_mode = PRIV_MODE_S;
-    dut->csr_mstatus = 0;
-    dut->csr_sie = mie_bit(INTERRUPT_S_TIMER);
-    dut->csr_sip = mie_bit(INTERRUPT_S_TIMER);
-    dut->csr_mideleg = mie_bit(INTERRUPT_S_TIMER);
-    dut->eval();
-    check(!dut->trap_trigger, "SupervisorInterruptMaskedBySstatusSie_NoTrigger");
-
-    drive_defaults(dut);
-    dut->csr_priv_mode = PRIV_MODE_U;
-    dut->csr_mstatus = 0;
-    dut->csr_sie = mie_bit(INTERRUPT_S_EXTERNAL);
-    dut->csr_sip = mie_bit(INTERRUPT_S_EXTERNAL);
-    dut->csr_mideleg = mie_bit(INTERRUPT_S_EXTERNAL);
-    dut->csr_stvec = 0x940ULL;
-    dut->eval();
-    check(dut->trap_to_s_mode, "SupervisorInterruptBelowS_IgnoresSstatusSie");
-    check(dut->trap_next_pc == 0x940ULL, "SupervisorInterruptBelowS_UsesStvec");
-
-    // ---------------------------------------------------------------------
-    // 3) MRET/SRET redirect without new traps
-    // ---------------------------------------------------------------------
-    drive_defaults(dut);
-    dut->csr_mepc = 0xCAFEBABEULL;
-    dut->trap_is_mret = 1;
-    dut->eval();
-    check(dut->mret_en, "Mret_PathEnabled");
-    check(dut->trap_next_pc == 0xCAFEBABEULL, "Mret_RestoresMepc");
-    check(dut->trap_flush_req && dut->trap_pc_sel, "Mret_ForcesFlush");
-    check(!dut->trap_trigger, "Mret_NoTrapOverlap");
-
-    drive_defaults(dut);
-    dut->csr_priv_mode = PRIV_MODE_S;
-    dut->csr_sepc = 0x13579BDFULL;
-    dut->trap_is_sret = 1;
-    dut->eval();
-    check(dut->sret_en, "Sret_PathEnabled");
-    check(dut->trap_next_pc == 0x13579BDFULL, "Sret_RestoresSepc");
-    check(dut->trap_flush_req && dut->trap_pc_sel, "Sret_ForcesFlush");
-
-    std::cout << "----------------------------------\n";
-    std::cout << "All " << pass_count << " trap_ctrl tests passed!\n";
-    std::cout << "----------------------------------\n";
-
-    delete dut;
-    return 0;
-}