sysdeps/sparc/sparc64/dl-irel.h

   1 /* Machine-dependent ELF indirect relocation inline functions.
   2    SPARC 64-bit version.
   3    Copyright (C) 2010-2024 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 <dl-plt.h>
  26 #include <ldsodefs.h>
  27
  28 #define ELF_MACHINE_IRELA       1
  29
  30 static inline Elf64_Addr
  31 __attribute ((always_inline))
  32 elf_ifunc_invoke (Elf64_Addr addr)
  33 {
  34   return ((Elf64_Addr (*) (int)) (addr)) (GLRO(dl_hwcap));
  35 }
  36
  37 static inline void
  38 __attribute ((always_inline))
  39 elf_irela (const Elf64_Rela *reloc)
  40 {
  41   unsigned int r_type = (reloc->r_info & 0xff);
  42
  43   if (__glibc_likely (r_type == R_SPARC_IRELATIVE))
  44     {
  45       Elf64_Addr *const reloc_addr = (void *) reloc->r_offset;
  46       Elf64_Addr value = elf_ifunc_invoke(reloc->r_addend);
  47       *reloc_addr = value;
  48     }
  49   else if (__glibc_likely (r_type == R_SPARC_JMP_IREL))
  50     {
  51       Elf64_Addr *const reloc_addr = (void *) reloc->r_offset;
  52       Elf64_Addr value = elf_ifunc_invoke(reloc->r_addend);
  53       struct link_map map = { .l_addr = 0 };
  54
  55       /* 'high' is always zero, for large PLT entries the linker
  56          emits an R_SPARC_IRELATIVE.  */
  57       sparc64_fixup_plt (&map, reloc, reloc_addr, value, 0, 0);
  58     }
  59   else if (r_type == R_SPARC_NONE)
  60     ;
  61   else
  62     __libc_fatal ("Unexpected reloc type in static binary.\n");
  63 }
  64
  65 #endif /* dl-irel.h */