lewis.moe
Nothing to see here, move along
1#![no_std]
2
3pub mod fs;
4pub mod io;
5pub mod net;
6pub mod path;
7pub mod syscall;
8
9unsafe extern "C" {
10 fn lancer_main() -> !;
11}
12
13const PROC_NAME_CAP: usize = 32;
14static mut PROC_NAME_BUF: [u8; PROC_NAME_CAP] = [0u8; PROC_NAME_CAP];
15static mut PROC_NAME_LEN: usize = 0;
16
17pub fn proc_name() -> &'static str {
18 let len = unsafe { PROC_NAME_LEN };
19 match len {
20 0 => "?",
21 _ => unsafe { core::str::from_utf8_unchecked(&PROC_NAME_BUF[..len]) },
22 }
23}
24
25#[unsafe(no_mangle)]
26#[allow(clippy::deref_addrof)]
27pub extern "C" fn _start(bootstrap: u64) -> ! {
28 match bootstrap {
29 0 | u64::MAX => {}
30 slot => {
31 crate::io::set_stdout_slot(slot);
32 crate::io::set_debug_print_enabled(false);
33 }
34 }
35 let name_len = syscall::get_proc_name(unsafe { &mut *(&raw mut PROC_NAME_BUF) });
36 if name_len > 0 {
37 unsafe { PROC_NAME_LEN = (name_len as usize).min(PROC_NAME_CAP) };
38 }
39 unsafe { lancer_main() }
40}
41
42fn fmt_u64_decimal(n: u64, buf: &mut [u8; 20]) -> usize {
43 match n {
44 0 => {
45 buf[19] = b'0';
46 19
47 }
48 _ => {
49 fn go(v: u64, buf: &mut [u8; 20], pos: usize) -> usize {
50 match v {
51 0 => pos,
52 _ => {
53 let next = pos - 1;
54 buf[next] = b'0' + (v % 10) as u8;
55 go(v / 10, buf, next)
56 }
57 }
58 }
59 go(n, buf, buf.len())
60 }
61 }
62}
63
64#[panic_handler]
65fn panic(info: &core::panic::PanicInfo) -> ! {
66 let pid = syscall::getpid();
67 let mut pid_buf = [0u8; 20];
68 let pid_start = fmt_u64_decimal(pid, &mut pid_buf);
69
70 syscall::debug_print("panic in userspace pid ");
71 if let Ok(s) = core::str::from_utf8(&pid_buf[pid_start..]) {
72 syscall::debug_print(s);
73 }
74 syscall::debug_print(": ");
75 match info.location() {
76 Some(loc) => {
77 syscall::debug_print(loc.file());
78 syscall::debug_print(":");
79 let mut line_buf = [0u8; 20];
80 let line_start = fmt_u64_decimal(loc.line() as u64, &mut line_buf);
81 if let Ok(s) = core::str::from_utf8(&line_buf[line_start..]) {
82 syscall::debug_print(s);
83 }
84 }
85 None => {
86 syscall::debug_print("unknown location");
87 }
88 }
89 syscall::debug_print("\n");
90 syscall::exit()
91}