sysdeps/unix/sysv/linux/powerpc/powerpc64/ldsodefs.h

   1 /* Run-time dynamic linker data structures for loaded ELF shared objects.
   2    Copyright (C) 2005, 2006 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    <http://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 static __always_inline bool
  27 _dl_ppc64_is_opd_sym (const struct link_map *l, const ElfW(Sym) *sym)
  28 {
  29   return (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC
  30           && l->l_addr + sym->st_value >= (ElfW(Addr)) l->l_ld
  31           && l->l_addr + sym->st_value < l->l_map_end
  32           && sym->st_size != 0);
  33 }
  34
  35 static __always_inline bool
  36 _dl_ppc64_addr_sym_match (const struct link_map *l, const ElfW(Sym) *sym,
  37                           const ElfW(Sym) *matchsym, ElfW(Addr) addr)
  38 {
  39   ElfW(Addr) value = l->l_addr + sym->st_value;
  40   if (_dl_ppc64_is_opd_sym (l, sym))
  41     {
  42       if (addr < value || addr >= value + 24)
  43         {
  44           value = *(ElfW(Addr) *) value;
  45           if (addr < value || addr >= value + sym->st_size)
  46             return false;
  47         }
  48     }
  49   else if (sym->st_shndx == SHN_UNDEF || sym->st_size == 0)
  50     {
  51       if (addr != value)
  52         return false;
  53     }
  54   else if (addr < value || addr >= value + sym->st_size)
  55     return false;
  56
  57   if (matchsym == NULL)
  58     return true;
  59
  60   ElfW(Addr) matchvalue = l->l_addr + matchsym->st_value;
  61   if (_dl_ppc64_is_opd_sym (l, matchsym)
  62       && (addr < matchvalue || addr > matchvalue + 24))
  63     matchvalue = *(ElfW(Addr) *) matchvalue;
  64
  65   return matchvalue < value;
  66 }
  67
  68 /* If this is a function symbol defined past the end of our dynamic
  69    section, then it must be a function descriptor.  Allow these symbols
  70    to match their associated function code range as well as the
  71    descriptor addresses.  */
  72 #undef DL_ADDR_SYM_MATCH
  73 #define DL_ADDR_SYM_MATCH(L, SYM, MATCHSYM, ADDR) \
  74   _dl_ppc64_addr_sym_match (L, SYM, MATCHSYM, ADDR)
  75
  76 #endif /* ldsodefs.h */