Function _start

euralios_std/src/lib.rs:61–102

()

#[no_mangle]
pub unsafe extern "sysv64" fn _start() -> ! {
    // Information passed from the operating system
    let heap_start: usize;
    let heap_size: usize;
    let args_address: usize;
    let env_address: usize;
    asm!("",
         lateout("rax") heap_start,
         lateout("rcx") heap_size,
         lateout("rdx") args_address,
         lateout("rdi") env_address,
         options(pure, nomem, nostack)
    );
    memory::init(heap_start, heap_size);

    if args_address != 0 {
        // Command-line arguments

        ARGS_SLICE = unsafe{
            let length = *(args_address as *mut i32) as usize;
            slice::from_raw_parts((args_address + 4) as *const u8, length)
        };
    }

    if env_address != 0 {
        // Environment

        ENV_SLICE = unsafe{
            let length = *(env_address as *mut i32) as usize;
            slice::from_raw_parts((env_address + 4) as *const u8, length)
        };
    }

    // Call the user program
    #[cfg(not(test))]
    main();

    #[cfg(test)]
    test_main();

    syscalls::thread_exit();
}

// Custom test framework