Function init_from_auxp

src/backend/linux_raw/param/init.rs:144–175

Process auxv entries from the auxv array pointed to by `auxp`. # Safety This must be passed a pointer to an auxv array. The buffer contains `Elf_aux_t` elements, though it need not be aligned; function uses `read_unaligned` to read from it.

(mut auxp: *const Elf_auxv_t)

/// The buffer contains `Elf_aux_t` elements, though it need not be aligned;
/// function uses `read_unaligned` to read from it.
unsafe fn init_from_auxp(mut auxp: *const Elf_auxv_t) {
    loop {
        let Elf_auxv_t { a_type, a_val } = read(auxp);

        match a_type as _ {
            AT_PAGESZ => PAGE_SIZE.store(a_val as usize, Ordering::Relaxed),
            AT_CLKTCK => CLOCK_TICKS_PER_SECOND.store(a_val as usize, Ordering::Relaxed),
            AT_HWCAP => HWCAP.store(a_val as usize, Ordering::Relaxed),
            AT_HWCAP2 => HWCAP2.store(a_val as usize, Ordering::Relaxed),
            AT_MINSIGSTKSZ => MINSIGSTKSZ.store(a_val as usize, Ordering::Relaxed),
            AT_EXECFN => EXECFN.store(a_val.cast::<c::c_char>(), Ordering::Relaxed),
            AT_SYSINFO_EHDR => SYSINFO_EHDR.store(a_val.cast::<Elf_Ehdr>(), Ordering::Relaxed),

            #[cfg(feature = "runtime")]
            AT_SECURE => SECURE.store(a_val as usize != 0, Ordering::Relaxed),
            #[cfg(feature = "runtime")]
            AT_PHDR => PHDR.store(a_val.cast::<Elf_Phdr>(), Ordering::Relaxed),
            #[cfg(feature = "runtime")]
            AT_PHNUM => PHNUM.store(a_val as usize, Ordering::Relaxed),
            #[cfg(feature = "runtime")]
            AT_PHENT => PHENT.store(a_val as usize, Ordering::Relaxed),
            #[cfg(feature = "runtime")]
            AT_ENTRY => ENTRY.store(a_val as usize, Ordering::Relaxed),
            #[cfg(feature = "runtime")]
            AT_RANDOM => RANDOM.store(a_val.cast::<[u8; 16]>(), Ordering::Relaxed),

            AT_NULL => break,
            _ => (),
        }
        auxp = auxp.add(1);
    }
}