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Merge branch 'bin-loader' into 'thread_scheduler'

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Binary loader

See merge request simpleos/burritos!12
This commit is contained in:
Legot Quentin 2023-04-04 13:35:10 +00:00
commit 0c3a254296
15 changed files with 758 additions and 67 deletions
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2
.gitlab-ci.yml
View File

@ -11,6 +11,8 @@ stages:
unit-test-job:
stage: test
script:
- echo "Compiling c files"
- cd test && make build && cd ..
- echo "Running unit tests..."
- cargo test

2
src/kernel/mod.rs
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@ -1,4 +1,4 @@
mod process;
pub mod process;
pub mod thread;
pub mod mgerror;
pub mod system;

6
src/kernel/thread.rs
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@ -16,7 +16,7 @@ macro_rules! get_new_thread {
pub struct ThreadContext {
pub int_registers: [i64; NUM_INT_REGS],
pub float_registers: [f32; NUM_FP_REGS],
pub pc: i64,
pub pc: u64,
}
#[derive(PartialEq, Debug)]
@ -47,10 +47,10 @@ impl Thread {
}
}
pub fn init_thread_context(&mut self, initial_pc_reg: i64, initial_sp: i64, arg: i64) {
pub fn init_thread_context(&mut self, initial_pc_reg: u64, initial_sp: u64, arg: i64) {
self.thread_context.pc = initial_pc_reg;
self.thread_context.int_registers[10] = arg;
self.thread_context.int_registers[STACK_REG] = initial_sp;
self.thread_context.int_registers[STACK_REG] = initial_sp as i64;
}
pub fn init_simulator_context(&self, base_stack_addr: [i8; SIMULATORSTACKSIZE]) {

37
src/kernel/thread_manager.rs
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@ -78,17 +78,19 @@ impl ThreadManager {
}
},
None => {
self.thread_restore_processor_state(machine, Rc::clone(&next_thread));
// next_thread.restore_simulator_state();
self.set_g_current_thread(Some(next_thread));
}
}
}
/// Start a thread, attaching it to a process
pub fn start_thread(&mut self, thread: Rc<RefCell<Thread>>, owner: Process, func_pc: i64, argument: i64) {
pub fn start_thread(&mut self, thread: Rc<RefCell<Thread>>, owner: Process, func_pc: u64, sp_loc: u64, argument: i64) {
let mut thread_m = thread.borrow_mut();
assert_eq!(thread_m.process, Option::None);
thread_m.process = Option::Some(owner);
let ptr = 0; // todo addrspace
let ptr = sp_loc; // todo addrspace
thread_m.init_thread_context(func_pc, ptr, argument);
let base_stack_addr: [i8; SIMULATORSTACKSIZE] = [0; SIMULATORSTACKSIZE]; // todo AllocBoundedArray
thread_m.init_simulator_context(base_stack_addr);
@ -153,6 +155,7 @@ impl ThreadManager {
for i in 0..NUM_FP_REGS {
t.thread_context.float_registers[i] = machine.read_fp_register(i);
}
t.thread_context.pc = machine.pc;
}
/// Restore the CPU state of a user program on a context switch.
@ -161,6 +164,7 @@ impl ThreadManager {
for i in 0..NUM_INT_REGS {
machine.write_int_register(i, t.thread_context.int_registers[i]);
}
machine.pc = t.thread_context.pc;
}
/// Currently running thread
@ -196,28 +200,33 @@ impl ThreadManager {
mod test {
use std::{rc::Rc, cell::RefCell};
use crate::{simulator::machine::Machine, kernel::{system::System, thread::Thread, process::Process}};
use crate::{simulator::{machine::Machine, loader}, kernel::{system::System, thread::Thread, process::Process}};
#[test]
#[ignore = "Pas encore terminé, contient des bugs"]
fn test_thread_context() {
let mut machine = Machine::init_machine();
let mut system = System::default();
let (loader, ptr) = loader::Loader::new("./test/riscv_instructions/simple_arithmetics/unsigned_addition", &mut machine, 0).expect("IO Error");
let start_pc = loader.elf_header.entrypoint;
let system = &mut System::default();
let thread1 = Thread::new("th1");
let thread1 = Rc::new(RefCell::new(thread1));
system.get_thread_manager().get_g_alive().push(Rc::clone(&thread1));
let owner = Process { num_thread: 0 };
system.get_thread_manager().start_thread(Rc::clone(&thread1), owner, thread1_func as i64, 0);
assert_eq!(thread1.borrow_mut().thread_context.pc, thread1_func as i64);
system.get_thread_manager().start_thread(Rc::clone(&thread1), owner, start_pc, ptr, -1);
debug_assert_eq!(thread1.borrow_mut().thread_context.pc, start_pc);
let to_run = system.get_thread_manager().find_next_to_run().unwrap();
assert_eq!(to_run, Rc::clone(&thread1));
assert!(system.get_thread_manager().get_g_alive().contains(&Rc::clone(&thread1)));
debug_assert_eq!(to_run, Rc::clone(&thread1));
debug_assert!(system.get_thread_manager().get_g_alive().contains(&Rc::clone(&thread1)));
system.get_thread_manager().switch_to(&mut machine, Rc::clone(&to_run));
debug_assert_eq!(system.get_thread_manager().g_current_thread, Option::Some(Rc::clone(&thread1)));
debug_assert_eq!(machine.pc, start_pc);
println!("{:#?}", thread1.borrow_mut().thread_context);
}
fn thread1_func() {
println!("Hello");
machine.run();
}
}

660
src/simulator/loader.rs
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@ -1,34 +1,650 @@
use crate::Machine;
use std::fs;
use std::io;
use std::io::BufRead;
use std::io::Read;
/// Load a file into a new machine
///
/// `panic!` when size is not 1, 2, 4 or 8
/// `panic!` when the text does not represents instructions in hexadecimal
/// load a 32-bits binary file into the machine
///
/// ### Parameters
///
/// - **path** the path of the file to load
/// - **size** the number of bytes to write (1, 2, 4 or 8)
pub fn _load(path : &str, instruction_size: i32) -> Machine {
let file = fs::File::open(path).expect("Wrong filename");
let reader = io::BufReader::new(file);
let mut machine = Machine::init_machine();
/// - **path** path of the file to load
/// - **machine** the machine where the bin file will be loaded
/// - **start_index** at which index of machine memory you want to start to load the program
///
/// Returns in a Result any io error
pub fn load(path: &str, machine: &mut Machine, start_index: usize) -> Result<(), std::io::Error> {
let mut file = fs::File::open(path)?;
let mut instructions: Vec<u32> = Default::default();
loop {
let mut buf: [u8; 4] = [0; 4];
let res = file.read(&mut buf)?;
if res == 0 {
break; // eof
} else {
instructions.push(u32::from_le_bytes(buf));
}
}
for (i, inst) in instructions.iter().enumerate() {
machine.write_memory(4, 4 * i + start_index, inst.to_owned() as u64);
}
// #[cfg(debug_assertions)]
// println!("{:04x?}", instructions); // only print loaded program in debug build
Ok(())
}
for (i,line) in reader.lines().enumerate() {
let res = u64::from_str_radix(&line.unwrap(), 16);
/// The elf header defines principes aspects of the binary files, it's place at the start of the file
/// see <https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header> for more informations
pub struct ElfHeader {
/// Defines whether the file is big or little endian
/// true correspond to big endian, false otherwise
///
/// Offset: 0x05, size: 1 byte
pub endianess: bool,
/// Defines whether the file is 32 bits or 64 bits
///
/// Offset: 0x04, size: 1 byte
pub is_32bits: bool,
/// Version of the elf file, current version is 1
///
/// Offset: 0x06, size: 1 byte
pub version: u8,
/// Identifies the target ABI.
///
/// In this implementation: Defines if the target abi is system V compliant
///
/// Offset: 0x07, size: 1 byte
pub sys_v_abi: bool,
/// Identifies target ISA, 0xF3 correspond to RISC-V
///
/// In this implementatio, true if target isa is RISC-V, false otherwise
///
/// Offset: 0x12, size: 2 bytes
pub is_riscv_target: bool,
/// Memory address of the entry point from w<here the process starts its execution.
/// If the program doesn't have an entrypoint (i.e. not an executable), the value is 0
///
/// Offset: 0x18, size: 4 (32 bits) or 8 (64 bits)
pub entrypoint: u64,
/// Size of the elf header, 64 bytes for 64 bits and 52 for 32 bits
///
/// Offset: 0x28(32 bits) or 0x34 (64 bits), size: 2 bytes
pub elf_header_size: u16,
/// Position of the first program header entry
///
/// Offset: 0x1C (32 bits) or 0x20 (64 bits), size: 4 (32 bits) or 8 (64 bits) bytes
pub program_header_location: u64,
/// Number of entries in the progream header table
///
/// Offset: 0x2C (32 bits) or 0x38 (64 bits), size: 2 bytes
pub program_header_entries: u16,
/// Size of a program header entry
///
/// Offset: 0x2A (32 bits) or 0x36 (64 bits), size: 2 bytes
pub program_header_size: u16,
/// Position of the first section header entry
///
/// Offset: 0x20 (32 bits) or 0x28 (64 bits), size: 4 (32 bits) or 8 (64 bits) bytes
pub section_header_location: u64,
/// Number of entries in the section header table
///
/// Offset: 0x30 (32 bits) or 0x3C (64 bits), size: 2 bytes
pub section_header_entries: u16,
/// Size of a section header entry
///
/// Offset: 0x2E (32 bits) or 0x36 (64 bits), size: 2 bytes
pub section_header_size: u16,
}
impl ElfHeader {
/// return true if the 4 first bytes constitude the elf magic number
fn is_elf(instructions: &[u8]) -> bool {
instructions.get(0..4) == Option::Some(&[0x7f, 0x45, 0x4c, 0x46])
}
/// return true if big endian, false otherwise
fn check_endianess(instructions: &[u8]) -> bool {
instructions.get(5) == Option::Some(&2)
}
/// return true if file is 32 bits, false if 64 bits
fn is_32bits(instructions: &[u8]) -> bool {
instructions.get(4) == Option::Some(&1)
}
/// return the version of the elf file (should be 1)
/// Can be None if the file is smaller than 7 bytes -> the file is invalid
fn get_version(instructions: &[u8]) -> Option<u8> {
instructions.get(6).copied() // work as primitives implements Copy
}
/// return true if target abi of the binary file is System V, false otherwise
fn is_system_v_elf(instructions: &[u8]) -> bool {
instructions.get(7) == Option::Some(&0)
}
/// return true if specified target instruction set architecture is RISCV
fn is_riscv_isa(instructions: &[u8]) -> bool {
Self::get_u16_value(instructions, 0x12) == Option::Some(0xf3)
}
/// memory address of the entry point from where the process starts its execution
///
/// ## Paramters:
///
/// **instructions** List of bytes of the loaded binary file
/// **is_32bits** defines whether the binary file is 32 bits or 64 bits
fn get_entrypoint(instructions: &[u8], is_32bits: bool) -> Option<u64> {
if is_32bits {
get_address_point(instructions, 0x18, true)
} else {
get_address_point(instructions, 0x18, false)
}
}
/// Memory address of the start of the program header table
///
/// ## Paramters:
///
/// **instructions** List of bytes of the loaded binary file
/// **is_32bits** defines whether the binary file is 32 bits or 64 bits
fn get_program_header_table_location(instructions: &[u8], is_32bits: bool) -> Option<u64> {
if is_32bits {
get_address_point(instructions, 0x1c, true)
} else {
get_address_point(instructions, 0x20, false)
}
}
/// Memory address of the start of the section header table
///
/// ## Paramters:
///
/// **instructions** List of bytes of the loaded binary file
/// **is_32bits** defines whether the binary file is 32 bits or 64 bits
fn get_section_header_table_location(instructions: &[u8], is_32bits: bool) -> Option<u64> {
if is_32bits {
get_address_point(instructions, 0x20, true)
} else {
get_address_point(instructions, 0x28, false)
}
}
/// Return the size of the header, normally, 0x40 for 64 bits bin and 0x34 for 32 bits
///
/// ## Paramters:
///
/// **instructions** List of bytes of the loaded binary file
/// **is_32bits** defines whether the binary file is 32 bits or 64 bits
fn get_elf_header_size(instructions: &[u8], is_32bits: bool) -> Option<u16> {
let address = if is_32bits { 0x28 } else { 0x34 };
Self::get_u16_value(instructions, address)
}
/// return the size of a program header table entry
///
/// ## Paramters:
///
/// **instructions** List of bytes of the loaded binary file
/// **is_32bits** defines whether the binary file is 32 bits or 64 bits
fn get_program_header_size(instructions: &[u8], is_32bits: bool) -> Option<u16> {
let address = if is_32bits { 0x2a } else { 0x36 };
Self::get_u16_value(instructions, address)
}
/// return the number of entries in the program header
///
/// ## Paramters:
///
/// **instructions** List of bytes of the loaded binary file
/// **is_32bits** defines whether the binary file is 32 bits or 64 bits
fn get_number_entries_program_header(instructions: &[u8], is_32bits: bool) -> Option<u16> {
let address = if is_32bits { 0x2c } else { 0x38 };
Self::get_u16_value(instructions, address)
}
/// Return the size of a section header table entry
///
/// ## Paramters:
///
/// **instructions** List of bytes of the loaded binary file
/// **is_32bits** defines whether the binary file is 32 bits or 64 bits
fn get_section_header_size(instructions: &[u8], is_32bits: bool) -> Option<u16> {
let address = if is_32bits { 0x2e } else { 0x3a };
Self::get_u16_value(instructions, address)
}
/// Return the number of entries in the section header
///
/// ## Paramters:
///
/// **instructions** List of bytes of the loaded binary file
/// **is_32bits** defines whether the binary file is 32 bits or 64 bits
fn get_section_header_num_entries(instructions: &[u8], is_32bits: bool) -> Option<u16> {
let address = if is_32bits { 0x30 } else { 0x3c };
Self::get_u16_value(instructions, address)
}
/// Return a u16 value, usually for the size or the number of entries inside a header
///
/// This method retrieve 2 bytes and concatenate them assuming the file is little endian
///
/// ## Paramters:
///
/// **instructions** List of bytes of the loaded binary file
/// **address** Position of the first byte
fn get_u16_value(instructions: &[u8], address: usize) -> Option<u16> {
let mut bytes: [u8; 2] = [0; 2];
bytes[0] = instructions.get(address).copied()?;
bytes[1] = instructions.get(address + 1).copied()?;
Option::Some(u16::from_le_bytes(bytes))
}
}
impl TryFrom<&Vec<u8>> for ElfHeader {
type Error = ();
fn try_from(instructions: &Vec<u8>) -> Result<Self, Self::Error> {
if Self::is_elf(instructions) {
let format = Self::is_32bits(instructions);
let endianess = Self::check_endianess(instructions);
let version = Self::get_version(instructions).ok_or(())?;
let is_sys_v_abi = Self::is_system_v_elf(instructions);
let is_rv_target = Self::is_riscv_isa(instructions);
let entrypoint = Self::get_entrypoint(instructions, format).ok_or(())?;
let elf_header_size = Self::get_elf_header_size(instructions, format).ok_or(())?;
let program_header_location = Self::get_program_header_table_location(instructions, format).ok_or(())?;
let program_header_entries = Self::get_number_entries_program_header(instructions, format).ok_or(())? ;
let program_header_size = Self::get_program_header_size(instructions, format).ok_or(())?;
let section_header_location = Self::get_section_header_table_location(instructions, format).ok_or(())?;
let section_header_entries = Self::get_section_header_num_entries(instructions, format).ok_or(())?;
let section_header_size = Self::get_section_header_size(instructions, format).ok_or(())?;
Ok(ElfHeader {
endianess,
is_32bits: format,
version,
sys_v_abi: is_sys_v_abi,
is_riscv_target: is_rv_target,
entrypoint,
elf_header_size,
program_header_location,
program_header_entries,
program_header_size,
section_header_location,
section_header_entries,
section_header_size
})
} else {
Err(())
}
}
}
/// Flag of a section, a section can have multiples flags by adding the values
#[allow(clippy::enum_variant_names)]
#[allow(dead_code)]
pub enum FlagValue {
/// The section is writable
ShfWrite = 0x1,
/// The section need to be allocate/occupe memory during execution
ShfAlloc = 0x2,
/// The section need to be executable
ShfExecinstr = 0x4,
/// Section might ber merged
ShfMerge = 0x10,
/// Contain null-terminated (\0) strings
ShfStrings = 0x20,
// There is others but are unrelevant (I think)
}
/// Section header entry, contains useful informations for each sections of the binary file
///
/// see <https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#Section_header>
#[derive(Debug)]
pub struct SectionHeader {
/// Offset to a string in .shstrtab section that represent the name of this section
///
/// Offset: 0x0, size: 4 bytes
pub name_offset: u32,
/// Identify the type of this header
///
/// Offset: 0x4, size: 4 bytes
pub header_type: u32,
/// Identify the atributes of this section
///
/// see `Self::does_flag_contains_key(self, FlagValue)`
///
/// Offset: 0x8, size: 4 (32 bits) or 8 (64 bits) bytes
pub flags: u64,
/// Virtual address of the section in memory if section is loaded, 0x0 otherwise
///
/// Offset: 0x0C (32 bits) or 0x10 (64 bits), size: 4 (32 bits) or 8 (64 bits) bytes
pub virt_addr: u64,
/// Offset of the section in the file image (binary file)
///
/// Offset: 0x10 (32 bits) or 0x18 (64 bits), size: 4 (32 bits) or 8 (64 bits) bytes
pub image_offset: u64,
/// Size of the section in the file image, may be 0
///
/// Offset: 0x14 (32 bits) or 0x20 (64 bits), size: 4 (32 bits) or 8 (64 bits) bytes
pub section_size: u64,
pub section_link: u32,
pub section_info: u32,
/// Contain the required alignment of the section, must be a power of 2
///
/// Offset: 0x20 (32 bits) or 0x30 (64 bits), size: 4 (32 bits) or 8 (64 bits) bytes
pub required_align: u64,
/// Contain the size of each entry, for sections that contain fixed size entries, otherwise 0
///
/// Offset: 0x24 (32 bits) or 0x38 (64 bits), size: 4 (32 bits) or 8 (64 bits) bytes
pub entry_size: u64
}
impl SectionHeader {
/// return true if flag of this section contains / have `key`, false otherwise
pub fn does_flag_contains_key(&self, key: FlagValue) -> bool {
self.flags & key as u64 != 0
}
/// Return the offset to a string in .shstrtab that represents the name of this section
fn get_name_offset(instructions: &[u8], address: usize) -> Option<u32> {
get_address_point(instructions, address, true).map(|v| { v as u32 })
// set true to return a u32
}
/// Return the type of header of the section
fn get_header_type(instructions: &[u8], address: usize) -> Option<u32> {
get_address_point(instructions, address + 0x4, true).map(|v| { v as u32 })
}
/// Return the flags of the section, can hold multiples values, see [`FlagValue`]
fn get_flags(instructions: &[u8], address: usize, is_32bits: bool) -> Option<u64> {
get_address_point(instructions, address + 0x8, is_32bits)
}
/// Return the virtual address of the section in memory if the sectino is loaded(see section flag), otherwise 0
fn get_virtual_address(instructions: &[u8], address: usize, is_32bits: bool) -> Option<u64> {
get_address_point(instructions, address + if is_32bits { 0x0C } else { 0x10 }, is_32bits)
}
/// Return the offset of the section in the file image (binary file)
fn get_image_offset(instructions: &[u8], address: usize, is_32bits: bool) -> Option<u64> {
get_address_point(instructions, address + if is_32bits { 0x10 } else { 0x18 }, is_32bits)
}
/// Return the size of the section in the file image (binary file), may be 0
fn get_section_size(instructions: &[u8], address: usize, is_32bits: bool) -> Option<u64> {
get_address_point(instructions, address + if is_32bits { 0x14 } else { 0x20 }, is_32bits)
}
fn get_section_link(instructions: &[u8], address: usize, is_32bits: bool) -> Option<u32> {
get_address_point(instructions, address + if is_32bits { 0x18 } else { 0x28 }, false).map(|v| { v as u32 })
}
fn get_section_info(instructions: &[u8], address: usize, is_32bits: bool) -> Option<u32> {
get_address_point(instructions, address + if is_32bits { 0x1C } else { 0x2C }, false).map(|v| { v as u32 })
}
/// Return the required alignment of the section, must be a power of 2
fn get_required_align(instructions: &[u8], address: usize, is_32bits: bool) -> Option<u64> {
get_address_point(instructions, address + if is_32bits { 0x20 } else { 0x30 }, is_32bits)
}
/// Contain the size of each entry for sections that contain fixed-size entries, otherwise 0
fn get_entry_size(instructions: &[u8], address: usize, is_32bits: bool) -> Option<u64> {
get_address_point(instructions, address + if is_32bits { 0x24 } else { 0x38 }, is_32bits)
}
}
impl TryFrom<(&[u8], u64, bool)> for SectionHeader {
type Error = ();
fn try_from(value: (&[u8], u64, bool)) -> Result<Self, Self::Error> {
let instructions = value.0;
let address = value.1 as usize;
let is_32bits = value.2;
let name_offset = Self::get_name_offset(instructions, address).ok_or(())?;
let header_type = Self::get_header_type(instructions, address).ok_or(())?;
let attribute = Self::get_flags(instructions, address, is_32bits).ok_or(())?;
let virt_addr = Self::get_virtual_address(instructions, address, is_32bits).ok_or(())?;
let image_offset = Self::get_image_offset(instructions, address, is_32bits).ok_or(())?;
let section_size = Self::get_section_size(instructions, address, is_32bits).ok_or(())?;
let section_link = Self::get_section_link(instructions, address, is_32bits).ok_or(())?;
let section_info = Self::get_section_info(instructions, address, is_32bits).ok_or(())?;
let required_align = Self::get_required_align(instructions, address, is_32bits).ok_or(())?;
let entry_size = Self::get_entry_size(instructions, address, is_32bits).ok_or(())?;
Ok(Self { name_offset,
header_type,
flags: attribute,
virt_addr,
image_offset,
section_size,
section_link,
section_info,
required_align,
entry_size
})
}
}
/// Error enum for [`Loader`]
#[derive(Debug)]
pub enum LoaderError {
/// Correspond to std IO error
IOError(std::io::Error),
/// Others errors
ParsingError
}
/// Global structure of the loader, one instance per loaded files
pub struct Loader {
/// List of bytes inside the binary file
bytes: Vec<u8>,
/// Elf header, see [`ElfHeader`] for more informations
pub elf_header: ElfHeader,
/// Section header table entries, see [`SectionHeader`] for more informations
pub sections: Vec<SectionHeader>
}
impl Loader {
/// # Loader constructor
///
/// Load the binary file given in parameter, parse it and load inside the machine memory
/// return the loader instance and the location of the end of the last a allocated section in memory
///
/// ## Parameters
///
/// **path**: location of the binary file on disk
/// **machine**: well, the risc-v simulator
/// **start_index**: The position at which you want to start to allocate the program
pub fn new(path: &str, machine: &mut Machine, start_index: usize) -> Result<(Self, u64), LoaderError> {
let loader = Self::load_and_parse(path)?;
let end_alloc = loader.load_into_machine(machine, start_index)?;
Ok((loader, end_alloc))
}
/// Try to load the binary file in memory after it been parsed
///
/// Binary file is loaded according to sections order and rules, see [`SectionHeader`]
///
/// Return the location of the end of the last a allocated section in memory
fn load_into_machine(&self, machine: &mut Machine, start_index: usize) -> Result<u64, LoaderError> {
let mut end_index = 0;
for i in 0..self.sections.len() {
let section = &self.sections[i];
if section.does_flag_contains_key(FlagValue::ShfAlloc) {
end_index = section.virt_addr + section.section_size;
// Can allocate to machine memory
for j in (0..section.section_size as usize).step_by(4) {
let mut buf: [u8; 4] = [0; 4];
#[allow(clippy::needless_range_loop)]
for k in 0..buf.len() {
buf[k] = self.bytes.get(section.image_offset as usize + j + k).copied().ok_or(LoaderError::ParsingError)?;
}
machine.write_memory(4, start_index + section.virt_addr as usize + j, u32::from_le_bytes(buf) as u64);
}
}
}
Ok(start_index as u64 + end_index)
}
/// Load the binary file and store it inside an array and try to parse it,
/// useful for a lot of thing like to know which sections to allocate memory and where
fn load_and_parse(path: &str) -> Result<Self, LoaderError> {
let file = fs::File::open(path);
match file {
Ok(mut file) => {
let mut instructions: Vec<u8> = Default::default();
loop {
let mut buf: [u8; 1] = [0; 1];
let res = file.read(&mut buf);
match res {
Ok(value) => {
Machine::write_memory(&mut machine, instruction_size, i*instruction_size as usize, value);
Ok(res) => {
if res == 0 {
break; // eof
} else {
instructions.push(buf[0]);
}
},
_ => panic!()
Err(err) => {
return Err(LoaderError::IOError(err))
}
}
println!("{:x}", Machine::read_memory(& mut machine, 4, 0));
machine
}
let elf_header = match ElfHeader::try_from(&instructions) {
Ok(header) => {
header
},
Err(_) => {
return Err(LoaderError::ParsingError);
}
};
let section_header = match Self::parse_section_header(&instructions, elf_header.is_32bits, elf_header.section_header_location, elf_header.section_header_entries, elf_header.section_header_size) {
Ok(header) => {
header
},
Err(_) => {
return Err(LoaderError::ParsingError);
}
};
// #[cfg(debug_assertions)]
// println!("{:04x?}", instructions); // only print loaded program in debug build
Ok(Self { bytes: instructions, elf_header, sections: section_header })
},
Err(err) => {
Err(LoaderError::IOError(err))
}
}
}
/// Try to parse sections header table
///
/// Create one instance of [`SectionHeader`] for each entry and store it inside an array
///
/// ## Parameters
///
/// **instructions**: array of bytes of the binary file
/// **is_32bits**: contain whether the binary file is 32 bits or 64 bits
/// **header_location**: represent the position of the first entry of the header
/// **num_of_entries**: defines the number of section header entries
/// **entry_size**: Defines the size of an entry (each entry have the exact same size), value vary depending of if this binary file is 32 or 64 bits
fn parse_section_header(instructions: &[u8], is_32bits: bool, header_location: u64, num_of_entries: u16, entry_size: u16) -> Result<Vec<SectionHeader>, ()> {
let mut sections: Vec<SectionHeader> = Default::default();
for i in 0..num_of_entries as u64 {
sections.push(Self::parse_section_entry(instructions, is_32bits, header_location + i * entry_size as u64)?);
}
Ok(sections)
}
/// Parse one entry of the section header
///
/// ## Parameters:
///
/// **instructions**: array of bytes of the binary file
/// **is_32bits**: contain whether the binary file is 32 bits or 64 bits
/// **location**: represent the position of the entry on the file image
fn parse_section_entry(instructions: &[u8], is_32bits: bool, location: u64) -> Result<SectionHeader, ()> {
SectionHeader::try_from((instructions, location, is_32bits))
}
}
/// return the memory address of something stored at address
/// Can return None if the file is smaller than adress + 3 (or 7 if 64 bits), in this case, the elf header is incorrect
fn get_address_point(instructions: &[u8], address: usize, is_32bits: bool) -> Option<u64> {
if is_32bits {
let mut bytes: [u8; 4] = [0; 4];
bytes[0] = instructions.get(address).copied()?;
bytes[1] = instructions.get(address + 1).copied()?;
bytes[2] = instructions.get(address + 2).copied()?;
bytes[3] = instructions.get(address + 3).copied()?;
Option::Some(u32::from_le_bytes(bytes) as u64)
} else {
let mut bytes: [u8; 8] = [0; 8];
bytes[0] = instructions.get(address).copied()?;
bytes[1] = instructions.get(address + 1).copied()?;
bytes[2] = instructions.get(address + 2).copied()?;
bytes[3] = instructions.get(address + 3).copied()?;
bytes[4] = instructions.get(address + 4).copied()?;
bytes[5] = instructions.get(address + 5).copied()?;
bytes[6] = instructions.get(address + 6).copied()?;
bytes[7] = instructions.get(address + 7).copied()?;
Option::Some(u64::from_le_bytes(bytes))
}
}
/// Tests has been made for C program compiled with RISC-V GCC 12.2.0, target: riscv64-unknown-elf
///
/// It may not pass in the future if future gcc version modify order of the binary or something else
#[cfg(test)]
mod test {
use crate::simulator::{loader::{Loader, SectionHeader}, machine::Machine};
#[test]
fn test_parse_elf() {
let mut machine = Machine::init_machine();
let loader = Loader::load_and_parse("./test/riscv_instructions/simple_arithmetics/unsigned_addition").expect("IO Error");
loader.load_into_machine(&mut machine, 0).expect("Parsing error");
assert!(!loader.elf_header.is_32bits);
assert!(!loader.elf_header.endianess);
assert!(loader.elf_header.sys_v_abi);
assert!(loader.elf_header.is_riscv_target);
assert_eq!(1, loader.elf_header.version);
assert_eq!(0x4000, loader.elf_header.entrypoint);
assert_eq!(64, loader.elf_header.elf_header_size);
assert_eq!(64, loader.elf_header.program_header_location);
assert_eq!(18984, loader.elf_header.section_header_location);
assert_eq!(56, loader.elf_header.program_header_size);
assert_eq!(64, loader.elf_header.section_header_size);
assert_eq!(4, loader.elf_header.program_header_entries);
assert_eq!(9, loader.elf_header.section_header_entries);
println!("{:#x?}", loader.sections);
}
#[test]
fn test_parse_section() {
let mut machine = Machine::init_machine();
let loader = Loader::load_and_parse("./test/riscv_instructions/simple_arithmetics/unsigned_addition").expect("IO Error");
loader.load_into_machine(&mut machine, 0).expect("Parsing error");
assert_eq!(9, loader.sections.len());
let n = loader.sections.iter().filter(|p| { p.does_flag_contains_key(crate::simulator::loader::FlagValue::ShfAlloc)}).collect::<Vec<&SectionHeader>>().len();
assert_eq!(3, n);
assert_eq!(loader.sections[1].virt_addr, 0x4000);
assert_eq!(loader.sections[1].image_offset, 0x1000);
assert!(loader.sections[1].does_flag_contains_key(crate::simulator::loader::FlagValue::ShfAlloc));
assert_eq!(loader.sections[2].virt_addr, 0x400_000);
assert_eq!(loader.sections[2].image_offset, 0x2000);
assert!(loader.sections[2].does_flag_contains_key(crate::simulator::loader::FlagValue::ShfAlloc));
}
}

7
src/simulator/machine.rs
View File

@ -177,7 +177,7 @@ impl Machine {
/// ### Parameters
///
/// - **machine** contains the memory
pub fn _extract_memory(&self){
pub fn _extract_memory(&mut self){
let file_path = "burritos_memory.txt";
let write_to_file = |path| -> std::io::Result<File> {
let mut file = File::create(path)?;
@ -207,9 +207,9 @@ impl Machine {
}
println!("________________SP________________");
let sp_index = self.int_reg.get_reg(2);
for i in 0..5 {
/* for i in 0..5 {
println!("SP+{:<2} : {:16x}", i*8, self.read_memory(8, (sp_index + i*8) as usize));
}
} */
println!("##################################");
}
@ -253,6 +253,7 @@ impl Machine {
Ok(MachineOk::Shutdown) => break,
Err(e) => { if e.to_string().contains("System") { break; } panic!("FATAL at pc {} -> {}", self.pc, e) }
}
self.write_int_register(0, 0); // In case an instruction write on register 0
}
}

11
test/Makefile
View File

@ -1,9 +1,15 @@
TOPDIR=.
include $(TOPDIR)/Makefile.config
all: dumps user_lib tests
#
# Main targets
#
build: user_lib
$(MAKE) build -C riscv_instructions/
dumps:
$(MAKE) dumps -C riscv_instructions/
mkdir -p ${TOPDIR}/target/dumps/
@ -18,4 +24,7 @@ tests: user_lib
find . -name '*.guac' -exec mv {} ${TOPDIR}/target/guac/ \;
clean:
rm -rf $(TOPDIR)/target
$(MAKE) clean -C userlib/
$(MAKE) clean -C riscv_instructions/
$(RM) -rf $(TOPDIR)/target

15
test/Makefile.tests
View File

@ -1,5 +1,11 @@
include $(TOPDIR)/Makefile.config
USERLIB = $(TOPDIR)/userlib
AS = $(RISCV_AS) -c
GCC = $(RISCV_GCC)
LD = $(RISCV_LD)
INCPATH += -I$(TOPDIR) -I$(USERLIB)
LDFLAGS = $(RISCV_LDFLAGS) -T $(USERLIB)/ldscript.lds
ASFLAGS = $(RISCV_ASFLAGS) $(INCPATH)
@ -7,16 +13,16 @@ CFLAGS = $(RISCV_CFLAGS) $(INCPATH)
# Rules
%.o: %.s
$(RISCV_AS) $(ASFLAGS) -c $<
$(AS) $(ASFLAGS) -c $<
%.o: %.c
$(RISCV_GCC) $(CFLAGS) -c $<
$(GCC) $(CFLAGS) -c $<
%.dump: %.o
$(RISCV_OBJCOPY) -j .text -O $(DUMP_FORMAT) $< $@
%.guac: %.o
$(RISCV_LD) $(LDFLAGS) $+ -o $@
$(LD) $(LDFLAGS) $+ -o $@
# Dependencies
.%.d: %.s
@ -31,6 +37,9 @@ CFLAGS = $(RISCV_CFLAGS) $(INCPATH)
| sed '\''s/\($*\)\.o[ :]*/\1.o $@ : /g'\'' > $@; \
[ -s $@ ] || rm -f $@'
$(PROGRAMS):
$(LD) $(LDFLAGS) $+ -o $@
# Targets
#clean:
# rm -rf *.o 2> /dev/null

5
test/riscv_instructions/.gitignore vendored Normal file
View File

@ -0,0 +1,5 @@
*
!.gitignore
!*.c
!*.md
!**/Makefile

10
test/riscv_instructions/Makefile
View File

@ -1,3 +1,8 @@
build:
make build -C boolean_logic/
make build -C jump_instructions/
make build -C simple_arithmetics/
dumps:
make dumps -C boolean_logic/
make dumps -C jump_instructions/
@ -7,3 +12,8 @@ tests:
make tests -C boolean_logic/
make tests -C jump_instructions/
make tests -C simple_arithmetics/
clean:
$(MAKE) clean -C boolean_logic/
$(MAKE) clean -C jump_instructions/
$(MAKE) clean -C simple_arithmetics/

12
test/riscv_instructions/boolean_logic/Makefile
View File

@ -1,9 +1,17 @@
TOPDIR = ../..
include $(TOPDIR)/Makefile.tests
PROGRAMS = comparisons if switch
build: $(PROGRAMS)
dumps: comparisons.dump if.dump switch.dump
tests: comparisons.guac if.guac switch.guac
TOPDIR = ../..
include $(TOPDIR)/Makefile.tests
clean:
$(RM) comparisons comparisons.o if if.o
# Dependances
$(PROGRAMS): % : $(USERLIB)/sys.o $(USERLIB)/libnachos.o %.o

13
test/riscv_instructions/jump_instructions/Makefile
View File

@ -1,6 +1,15 @@
TOPDIR = ../..
include $(TOPDIR)/Makefile.tests
PROGRAMS = jump ret
build: $(PROGRAMS)
dumps: jump.dump ret.dump
tests: jump.guac ret.guac
clean:
$(RM) jump jump.o ret ret.o
TOPDIR = ../..
include $(TOPDIR)/Makefile.tests
$(PROGRAMS): % : $(USERLIB)/sys.o $(USERLIB)/libnachos.o %.o

14
test/riscv_instructions/simple_arithmetics/Makefile
View File

@ -1,6 +1,16 @@
TOPDIR = ../..
include $(TOPDIR)/Makefile.tests
PROGRAMS = unsigned_addition unsigned_division unsigned_multiplication unsigned_substraction
build: $(PROGRAMS)
dumps: unsigned_addition.dump unsigned_division.dump unsigned_multiplication.dump unsigned_substraction.dump
tests: unsigned_addition.guac unsigned_division.guac unsigned_multiplication.guac unsigned_substraction.guac
clean:
$(RM) unsigned_addition unsigned_addition.o unsigned_division unsigned_division.o unsigned_multiplication unsigned_multiplication.o unsigned_substraction unsigned_substraction.o
TOPDIR = ../..
include $(TOPDIR)/Makefile.tests
$(PROGRAMS): % : $(USERLIB)/sys.o $(USERLIB)/libnachos.o %.o

3
test/userlib/Makefile
View File

@ -2,3 +2,6 @@ TOPDIR = ../
include $(TOPDIR)/Makefile.tests
default: sys.o libnachos.o
clean:
$(RM) libnachos.o sys.o

2
test/userlib/syscall.h
View File

@ -84,7 +84,7 @@
typedef int t_error;
/* Stop Nachos, and print out performance stats */
void Halt();
void Shutdown();
/* Return the time spent running Nachos */