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40 lines
836 B
40 lines
836 B
#![no_std]
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#![feature(asm)]
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#![feature(linkage)]
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#![feature(panic_info_message)]
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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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#[no_mangle]
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#[link_section = ".text.entry"]
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pub extern "C" fn _start() -> ! {
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clear_bss();
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exit(main());
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panic!("unreachable after sys_exit!");
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}
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#[linkage = "weak"]
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#[no_mangle]
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fn main() -> i32 {
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panic!("Cannot find main!");
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}
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fn clear_bss() {
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extern "C" {
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fn start_bss();
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fn end_bss();
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}
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(start_bss as usize..end_bss as usize).for_each(|addr| {
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unsafe { (addr as *mut u8).write_volatile(0); }
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});
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}
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use syscall::*;
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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) -> isize { 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() } |