1  /* MIPS-specific handling of undefined symbols.
       2     Copyright (C) 2008-2023 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 _ELF_MACHINE_SYM_NO_MATCH_H
      20  #define _ELF_MACHINE_SYM_NO_MATCH_H
      21  
      22  #include <link.h>
      23  #include <stdbool.h>
      24  
      25  /* The semantics of zero/non-zero values of undefined symbols differs
      26     depending on whether the non-PIC ABI is in use.  Under the non-PIC
      27     ABI, a non-zero value indicates that there is an address reference
      28     to the symbol and thus it must always be resolved (except when
      29     resolving a jump slot relocation) to the PLT entry whose address is
      30     provided as the symbol's value; a zero value indicates that this
      31     canonical-address behaviour is not required.  Yet under the classic
      32     MIPS psABI, a zero value indicates that there is an address
      33     reference to the function and the dynamic linker must resolve the
      34     symbol immediately upon loading.  To avoid conflict, symbols for
      35     which the dynamic linker must assume the non-PIC ABI semantics are
      36     marked with the STO_MIPS_PLT flag.  */
      37  static inline bool
      38  elf_machine_sym_no_match (const ElfW(Sym) *sym)
      39  {
      40    return sym->st_shndx == SHN_UNDEF && !(sym->st_other & STO_MIPS_PLT);
      41  }
      42  
      43  #endif /* _ELF_MACHINE_SYM_NO_MATCH_H */