src/libstd/sys/sgx/abi/reloc.rs

   1 use super::mem;
   2 use crate::slice::from_raw_parts;
   3
   4 const R_X86_64_RELATIVE: u32 = 8;
   5
   6 #[repr(packed)]
   7 struct Rela<T> {
   8     offset: T,
   9     info: T,
  10     addend: T,
  11 }
  12
  13 pub fn relocate_elf_rela() {
  14     extern "C" {
  15         static RELA: u64;
  16         static RELACOUNT: usize;
  17     }
  18
  19     if unsafe { RELACOUNT } == 0 {
  20         return;
  21     } // unsafe ok: link-time constant
  22
  23     let relas = unsafe {
  24         from_raw_parts::<Rela<u64>>(mem::rel_ptr(RELA), RELACOUNT) // unsafe ok: link-time constant
  25     };
  26     for rela in relas {
  27         if rela.info != (/*0 << 32 |*/R_X86_64_RELATIVE as u64) {
  28             rtabort!("Invalid relocation");
  29         }
  30         unsafe { *mem::rel_ptr_mut::<*const ()>(rela.offset) = mem::rel_ptr(rela.addend) };
  31     }
  32 }