sysdeps/loongarch/dl-irel.h

   1 /* Machine-dependent ELF indirect relocation inline functions.
   2    Copyright (C) 2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _DL_IREL_H
  20 #define _DL_IREL_H
  21
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <sys/ifunc.h>
  25
  26 #define ELF_MACHINE_IRELA 1
  27
  28 static inline ElfW (Addr) __attribute ((always_inline))
  29 elf_ifunc_invoke (ElfW (Addr) addr)
  30 {
  31   __ifunc_arg_t arg =
  32   {
  33     ._size = sizeof (__ifunc_arg_t),
  34     ._hwcap = GLRO(dl_hwcap),
  35   };
  36   return ((ElfW(Addr) (*) (const __ifunc_arg_t *)) (addr)) (&arg);
  37 }
  38
  39 static inline void __attribute ((always_inline))
  40 elf_irela (const ElfW (Rela) *reloc)
  41 {
  42   ElfW (Addr) *const reloc_addr = (void *) reloc->r_offset;
  43   const unsigned long int r_type = ELFW (R_TYPE) (reloc->r_info);
  44
  45   if (__glibc_likely (r_type == R_LARCH_IRELATIVE))
  46     {
  47       ElfW (Addr) value = elf_ifunc_invoke (reloc->r_addend);
  48       *reloc_addr = value;
  49     }
  50   else
  51     __libc_fatal ("Unexpected reloc type in static binary.\n");
  52 }
  53
  54 #endif /* dl-irel.h */