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// Copyright 2015-2016 David Li
// This file is part of rustv.
// rustv 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.
// rustv 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 rustv. If not, see <http://www.gnu.org/licenses/>.
#![feature(augmented_assignments, braced_empty_structs,
op_assign_traits, step_by)]
extern crate elfloader32 as elfloader_lib;
pub mod isa;
pub mod memory;
pub mod register_file;
pub mod simulator;
pub mod syscall;
pub mod trap;
pub use elfloader_lib as elfloader;
#[cfg(test)]
mod tests {
#[test]
fn cache_address_parsing() {
use isa::*;
use memory::*;
use std::rc::Rc;
use std::cell::RefCell;
let memory = Memory::new(16);
let memory_ref = Rc::new(RefCell::new(memory));
let dm_cache_word = DirectMappedCache::new(4, 1, memory_ref.clone());
let dm_cache_doubleword = DirectMappedCache::new(4, 2, memory_ref.clone());
assert_eq!(dm_cache_word.parse_address(Word(0xFFFFFFFD)),
(0xFFFFFFF, 3, 1));
assert_eq!(dm_cache_doubleword.parse_address(Word(0xFFFFFFFD)),
(0x7FFFFFF, 3, 5));
}
#[test]
fn memory_rw() {
use std::rc::Rc;
use std::cell::RefCell;
use isa::*;
use memory::*;
let size = 0xFF;
let mut memory = Memory::new(size);
assert_eq!(memory.write_word(Word(0), Word(0xF0)),
Err(MemoryError::InvalidAddress));
assert_eq!(memory.write_byte(Word(0), Byte(0xF0)),
Err(MemoryError::InvalidAddress));
assert_eq!(memory.write_byte(Word(1), Byte(0xF0)),
Err(MemoryError::InvalidAddress));
assert_eq!(memory.write_byte(Word(2), Byte(0xF0)),
Err(MemoryError::InvalidAddress));
assert_eq!(memory.write_byte(Word(3), Byte(0xF0)),
Err(MemoryError::InvalidAddress));
assert_eq!(memory.write_halfword(Word(0), HalfWord(0xF0)),
Err(MemoryError::InvalidAddress));
assert_eq!(memory.write_halfword(Word(2), HalfWord(0xF0)),
Err(MemoryError::InvalidAddress));
for address in (4..size).step_by(4) {
let address = Word(address as u32);
assert_eq!(memory.write_word(address, Word(0xF0)), Ok(()));
assert_eq!(memory.read_word(address), Ok(Word(0xF0)));
assert_eq!(memory.read_halfword(address), Ok(HalfWord(0xF0)));
assert_eq!(memory.read_halfword(address + 2), Ok(HalfWord(0x0)));
assert_eq!(memory.read_byte(address), Ok(Byte(0xF0)));
assert_eq!(memory.read_byte(address + 1), Ok(Byte(0x0)));
assert_eq!(memory.read_byte(address + 2), Ok(Byte(0x0)));
assert_eq!(memory.read_byte(address + 3), Ok(Byte(0x0)));
}
assert_eq!(memory.write_word(Word(0x10), Word(0x01234567)), Ok(()));
assert_eq!(memory.write_word(Word(0x14), Word(0xDEADBEEF)), Ok(()));
assert_eq!(memory.read_byte(Word(0x10)), Ok(Byte(0x67)));
assert_eq!(memory.read_byte(Word(0x11)), Ok(Byte(0x45)));
assert_eq!(memory.read_byte(Word(0x12)), Ok(Byte(0x23)));
assert_eq!(memory.read_byte(Word(0x13)), Ok(Byte(0x01)));
assert_eq!(memory.read_halfword(Word(0x10)), Ok(HalfWord(0x4567)));
assert_eq!(memory.read_halfword(Word(0x12)), Ok(HalfWord(0x0123)));
let stall = Err(MemoryError::CacheMiss {
stall_cycles: memory.latency(),
});
let write_stall = Err(MemoryError::CacheMiss {
stall_cycles: memory.latency(),
});
let memory_ref = Rc::new(RefCell::new(memory));
let mut dm_cache = DirectMappedCache::new(4, 4, memory_ref.clone());
assert_eq!(dm_cache.read_word(Word(0x10)), stall);
for _ in 0..100 {
dm_cache.step();
}
assert_eq!(dm_cache.write_word(Word(0x20), Word(0x123)), write_stall);
assert_eq!(dm_cache.read_word(Word(0x10)), Ok(Word(0x01234567)));
assert_eq!(dm_cache.read_word(Word(0x14)), Ok(Word(0xDEADBEEF)));
assert_eq!(dm_cache.read_word(Word(0x18)), Ok(Word(0xF0)));
assert_eq!(dm_cache.read_word(Word(0x1C)), Ok(Word(0xF0)));
assert_eq!(dm_cache.read_byte(Word(0x10)), Ok(Byte(0x67)));
assert_eq!(dm_cache.read_byte(Word(0x11)), Ok(Byte(0x45)));
assert_eq!(dm_cache.read_byte(Word(0x12)), Ok(Byte(0x23)));
assert_eq!(dm_cache.read_byte(Word(0x13)), Ok(Byte(0x01)));
assert_eq!(dm_cache.write_word(Word(0x18), Word(0xBEEFBEEF)), Ok(()));
assert_eq!(dm_cache.read_word(Word(0x18)), Ok(Word(0xBEEFBEEF)));
assert_eq!(dm_cache.read_halfword(Word(0x10)), Ok(HalfWord(0x4567)));
assert_eq!(dm_cache.read_halfword(Word(0x12)), Ok(HalfWord(0x0123)));
assert_eq!(memory_ref.borrow_mut().read_word(Word(0x18)), Ok(Word(0xBEEFBEEF)));
for _ in 0..100 {
dm_cache.step();
}
assert_eq!(dm_cache.write_word(Word(0x20), Word(0x123)), Ok(()));
assert_eq!(memory_ref.borrow_mut().read_word(Word(0x20)), Ok(Word(0x123)));
// Should not have been evicted
assert_eq!(dm_cache.read_word(Word(0x10)), Ok(Word(0x01234567)));
assert_eq!(dm_cache.read_word(Word(0x14)), Ok(Word(0xDEADBEEF)));
assert_eq!(dm_cache.read_word(Word(0x18)), Ok(Word(0xBEEFBEEF)));
assert_eq!(dm_cache.read_word(Word(0x1C)), Ok(Word(0xF0)));
assert_eq!(dm_cache.read_halfword(Word(0x10)), Ok(HalfWord(0x4567)));
assert_eq!(dm_cache.read_halfword(Word(0x12)), Ok(HalfWord(0x0123)));
assert_eq!(dm_cache.write_byte(Word(0x10), Byte(0x42)), Ok(()));
assert_eq!(dm_cache.write_halfword(Word(0x12), HalfWord(0x4242)), Ok(()));
assert_eq!(memory_ref.borrow_mut().read_word(Word(0x10)), Ok(Word(0x42424542)));
}
}
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