1  /* Machine-dependent ELF indirect relocation inline functions.
       2     Copyright (C) 2022-2023 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 */