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