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108 lines
2.9 KiB
108 lines
2.9 KiB
#![no_std]
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#![feature(linkage)]
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#![feature(panic_info_message)]
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#![feature(alloc_error_handler)]
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#[macro_use]
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pub mod console;
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mod syscall;
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mod lang_items;
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extern crate alloc;
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#[macro_use]
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extern crate bitflags;
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use syscall::*;
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use buddy_system_allocator::LockedHeap;
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use alloc::vec::Vec;
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const USER_HEAP_SIZE: usize = 32768;
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static mut HEAP_SPACE: [u8; USER_HEAP_SIZE] = [0; USER_HEAP_SIZE];
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#[global_allocator]
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static HEAP: LockedHeap = LockedHeap::empty();
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#[alloc_error_handler]
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pub fn handle_alloc_error(layout: core::alloc::Layout) -> ! {
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panic!("Heap allocation error, layout = {:?}", layout);
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}
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#[no_mangle]
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#[link_section = ".text.entry"]
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pub extern "C" fn _start(argc: usize, argv: usize) -> ! {
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unsafe {
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HEAP.lock()
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.init(HEAP_SPACE.as_ptr() as usize, USER_HEAP_SIZE);
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}
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let mut v: Vec<&'static str> = Vec::new();
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for i in 0..argc {
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let str_start = unsafe {
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((argv + i * core::mem::size_of::<usize>()) as *const usize).read_volatile()
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};
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let len = (0usize..).find(|i| unsafe {
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((str_start + *i) as *const u8).read_volatile() == 0
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}).unwrap();
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v.push(
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core::str::from_utf8(unsafe {
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core::slice::from_raw_parts(str_start as *const u8, len)
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}).unwrap()
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);
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}
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exit(main(argc, v.as_slice()));
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}
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#[linkage = "weak"]
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#[no_mangle]
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fn main(_argc: usize, _argv: &[&str]) -> i32 {
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panic!("Cannot find main!");
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}
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bitflags! {
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pub struct OpenFlags: u32 {
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const RDONLY = 0;
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const WRONLY = 1 << 0;
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const RDWR = 1 << 1;
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const CREATE = 1 << 9;
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const TRUNC = 1 << 10;
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}
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}
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pub fn dup(fd: usize) -> isize { sys_dup(fd) }
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pub fn open(path: &str, flags: OpenFlags) -> isize { sys_open(path, flags.bits) }
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pub fn close(fd: usize) -> isize { sys_close(fd) }
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pub fn pipe(pipe_fd: &mut [usize]) -> isize { sys_pipe(pipe_fd) }
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pub fn read(fd: usize, buf: &mut [u8]) -> isize { sys_read(fd, buf) }
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pub fn write(fd: usize, buf: &[u8]) -> isize { sys_write(fd, buf) }
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pub fn exit(exit_code: i32) -> ! { sys_exit(exit_code); }
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pub fn yield_() -> isize { sys_yield() }
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pub fn get_time() -> isize { sys_get_time() }
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pub fn getpid() -> isize { sys_getpid() }
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pub fn fork() -> isize { sys_fork() }
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pub fn exec(path: &str, args: &[*const u8]) -> isize { sys_exec(path, args) }
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pub fn wait(exit_code: &mut i32) -> isize {
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loop {
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match sys_waitpid(-1, exit_code as *mut _) {
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-2 => { yield_(); }
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// -1 or a real pid
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exit_pid => return exit_pid,
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}
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}
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}
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pub fn waitpid(pid: usize, exit_code: &mut i32) -> isize {
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loop {
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match sys_waitpid(pid as isize, exit_code as *mut _) {
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-2 => { yield_(); }
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// -1 or a real pid
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exit_pid => return exit_pid,
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}
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}
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}
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pub fn sleep(period_ms: usize) {
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let start = sys_get_time();
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while sys_get_time() < start + period_ms as isize {
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sys_yield();
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}
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}
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