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// SPDX-License-Identifier: GPL-2.0+
/*******************************************************************************
* QtMips - MIPS 32-bit Architecture Subset Simulator
*
* Implemented to support following courses:
*
* B35APO - Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b35apo
*
* B4M35PAP - Advanced Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
*
* Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
* Copyright (c) 2019 Pavel Pisa <pisa@cmp.felk.cvut.cz>
*
* Faculty of Electrical Engineering (http://www.fel.cvut.cz)
* Czech Technical University (http://www.cvut.cz/)
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
******************************************************************************/
#include "qtmipsmachine.h"
#include "programloader.h"
using namespace machine;
QtMipsMachine::QtMipsMachine(const MachineConfig &cc) : QObject(), mcnf(&cc) {
MemoryAccess *cpu_mem;
stat = ST_READY;
ProgramLoader program(cc.elf());
mem_program_only = new Memory();
program.to_memory(mem_program_only);
program_end = program.end();
regs = new Registers();
if (program.get_executable_entry())
regs->pc_abs_jmp(program.get_executable_entry());
mem = new Memory(*mem_program_only);
cpu_mem = mem;
#if 1
physaddrspace = new PhysAddrSpace();
physaddrspace->insert_range(mem, 0x00000000, 0xefffffff, false);
MemoryAccess *periph = new SimplePeripheral();
physaddrspace->insert_range(periph, 0xffffc000, 0xffffcfff, true);
cpu_mem = physaddrspace;
#endif
cch_program = new Cache(cpu_mem, &cc.cache_program(), cc.memory_access_time_read(), cc.memory_access_time_write());
cch_data = new Cache(cpu_mem, &cc.cache_data(), cc.memory_access_time_read(), cc.memory_access_time_write());
if (cc.pipelined())
cr = new CorePipelined(regs, cch_program, cch_data, cc.hazard_unit());
else
cr = new CoreSingle(regs, cch_program, cch_data, cc.delay_slot());
run_t = new QTimer(this);
set_speed(0); // In default run as fast as possible
connect(run_t, SIGNAL(timeout()), this, SLOT(step()));
}
QtMipsMachine::~QtMipsMachine() {
if (run_t != nullptr)
delete run_t;
run_t = nullptr;
if (cr != nullptr)
delete cr;
cr = nullptr;
if (regs != nullptr)
delete regs;
regs = nullptr;
if (mem != nullptr)
delete mem;
mem = nullptr;
if (cch_program != nullptr)
delete cch_program;
cch_program = nullptr;
if (cch_data != nullptr)
delete cch_data;
cch_data = nullptr;
if (physaddrspace != nullptr)
delete physaddrspace;
physaddrspace = nullptr;
if (mem_program_only != nullptr)
delete mem_program_only;
mem_program_only = nullptr;
}
const MachineConfig &QtMipsMachine::config() {
return mcnf;
}
void QtMipsMachine::set_speed(unsigned val) {
run_t->setInterval(val);
}
const Registers *QtMipsMachine::registers() {
return regs;
}
const Memory *QtMipsMachine::memory() {
return mem;
}
const Cache *QtMipsMachine::cache_program() {
return cch_program;
}
const Cache *QtMipsMachine::cache_data() {
return cch_data;
}
const Core *QtMipsMachine::core() {
return cr;
}
const CoreSingle *QtMipsMachine::core_singe() {
return mcnf.pipelined() ? nullptr : (const CoreSingle*)cr;
}
const CorePipelined *QtMipsMachine::core_pipelined() {
return mcnf.pipelined() ? (const CorePipelined*)cr : nullptr;
}
enum QtMipsMachine::Status QtMipsMachine::status() {
return stat;
}
bool QtMipsMachine::exited() {
return stat == ST_EXIT || stat == ST_TRAPPED;
}
// We don't allow to call control methods when machine exited or if it's busy
// We rather silently fail.
#define CTL_GUARD do { if (exited() || stat == ST_BUSY) return; } while(false)
void QtMipsMachine::play() {
CTL_GUARD;
set_status(ST_RUNNING);
run_t->start();
}
void QtMipsMachine::pause() {
if (stat != ST_BUSY)
CTL_GUARD;
set_status(ST_READY);
run_t->stop();
}
void QtMipsMachine::step() {
CTL_GUARD;
enum Status stat_prev = stat;
set_status(ST_BUSY);
emit tick();
try {
cr->step();
} catch (QtMipsException &e) {
run_t->stop();
set_status(ST_TRAPPED);
emit program_trap(e);
return;
}
if (regs->read_pc() >= program_end) {
run_t->stop();
set_status(ST_EXIT);
emit program_exit();
} else {
if (stat == ST_BUSY)
set_status(stat_prev);
}
emit post_tick();
}
void QtMipsMachine::restart() {
pause();
regs->reset();
mem->reset(*mem_program_only);
cch_program->reset();
cch_data->reset();
cr->reset();
set_status(ST_READY);
}
void QtMipsMachine::set_status(enum Status st) {
bool change = st != stat;
stat = st;
if (change)
emit status_change(st);
}
void QtMipsMachine::register_exception_handler(ExceptionCause excause,
ExceptionHandler *exhandler) {
if (cr != nullptr)
cr->register_exception_handler(excause, exhandler);
}
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