sysdeps/aarch64/dl-irel.h

   1 /* Machine-dependent ELF indirect relocation inline functions.
   2    AArch64 version.
   3    Copyright (C) 2012-2023 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _DL_IREL_H
  21 #define _DL_IREL_H
  22
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <ldsodefs.h>
  26 #include <sysdep.h>
  27 #include <sys/ifunc.h>
  28
  29 #define ELF_MACHINE_IRELA       1
  30
  31 static inline ElfW(Addr)
  32 __attribute ((always_inline))
  33 elf_ifunc_invoke (ElfW(Addr) addr)
  34 {
  35   __ifunc_arg_t arg;
  36
  37   arg._size = sizeof (arg);
  38   arg._hwcap = GLRO(dl_hwcap);
  39   arg._hwcap2 = GLRO(dl_hwcap2);
  40   return ((ElfW(Addr) (*) (uint64_t, const __ifunc_arg_t *)) (addr))
  41          (GLRO(dl_hwcap) | _IFUNC_ARG_HWCAP, &arg);
  42 }
  43
  44 static inline void
  45 __attribute ((always_inline))
  46 elf_irela (const ElfW(Rela) *reloc)
  47 {
  48   ElfW(Addr) *const reloc_addr = (void *) reloc->r_offset;
  49   const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info);
  50
  51   if (__glibc_likely (r_type == AARCH64_R(IRELATIVE)))
  52     {
  53       ElfW(Addr) value = elf_ifunc_invoke (reloc->r_addend);
  54       *reloc_addr = value;
  55     }
  56   else
  57     __libc_fatal ("Unexpected reloc type in static binary.\n");
  58 }
  59
  60 #endif