1  /* Run-time dynamic linker data structures for loaded ELF shared objects.
       2     Copyright (C) 2005-2023 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	_LDSODEFS_H
      20  
      21  /* Get the real definitions.  */
      22  #include_next <ldsodefs.h>
      23  
      24  /* Now define our stuff.  */
      25  
      26  #if _CALL_ELF != 2
      27  
      28  static __always_inline bool
      29  _dl_ppc64_is_opd_sym (const struct link_map *l, const ElfW(Sym) *sym)
      30  {
      31    return (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC
      32  	  && l->l_addr + sym->st_value >= (ElfW(Addr)) l->l_ld
      33  	  && l->l_addr + sym->st_value < l->l_map_end
      34  	  && sym->st_size != 0);
      35  }
      36  
      37  static __always_inline bool
      38  _dl_ppc64_addr_sym_match (const struct link_map *l, const ElfW(Sym) *sym,
      39  			  const ElfW(Sym) *matchsym, ElfW(Addr) addr)
      40  {
      41    ElfW(Addr) value = l->l_addr + sym->st_value;
      42    if (_dl_ppc64_is_opd_sym (l, sym))
      43      {
      44        if (addr < value || addr >= value + 24)
      45  	{
      46  	  value = *(ElfW(Addr) *) value;
      47  	  if (addr < value || addr >= value + sym->st_size)
      48  	    return false;
      49  	}
      50      }
      51    else if (sym->st_shndx == SHN_UNDEF || sym->st_size == 0)
      52      {
      53        if (addr != value)
      54  	return false;
      55      }
      56    else if (addr < value || addr >= value + sym->st_size)
      57      return false;
      58  
      59    if (matchsym == NULL)
      60      return true;
      61  
      62    ElfW(Addr) matchvalue = l->l_addr + matchsym->st_value;
      63    if (_dl_ppc64_is_opd_sym (l, matchsym)
      64        && (addr < matchvalue || addr > matchvalue + 24))
      65      matchvalue = *(ElfW(Addr) *) matchvalue;
      66  
      67    return matchvalue < value;
      68  }
      69  
      70  /* If this is a function symbol defined past the end of our dynamic
      71     section, then it must be a function descriptor.  Allow these symbols
      72     to match their associated function code range as well as the
      73     descriptor addresses.  */
      74  #undef DL_ADDR_SYM_MATCH
      75  #define DL_ADDR_SYM_MATCH(L, SYM, MATCHSYM, ADDR) \
      76    _dl_ppc64_addr_sym_match (L, SYM, MATCHSYM, ADDR)
      77  
      78  #endif
      79  
      80  #endif /* ldsodefs.h */