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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _LDSODEFS_H
  21
  22 /* Get the real definitions.  */
  23 #include_next <ldsodefs.h>
  24
  25 /* Now define our stuff.  */
  26
  27 static __always_inline bool
  28 _dl_ppc64_is_opd_sym (const struct link_map *l, const ElfW(Sym) *sym)
  29 {
  30   return (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC
  31           && l->l_addr + sym->st_value >= (ElfW(Addr)) l->l_ld
  32           && l->l_addr + sym->st_value < l->l_map_end
  33           && sym->st_size != 0);
  34 }
  35
  36 static __always_inline bool
  37 _dl_ppc64_addr_sym_match (const struct link_map *l, const ElfW(Sym) *sym,
  38                           const ElfW(Sym) *matchsym, ElfW(Addr) addr)
  39 {
  40   ElfW(Addr) value = l->l_addr + sym->st_value;
  41   if (_dl_ppc64_is_opd_sym (l, sym))
  42     {
  43       if (addr < value || addr >= value + 24)
  44         {
  45           value = *(ElfW(Addr) *) value;
  46           if (addr < value || addr >= value + sym->st_size)
  47             return false;
  48         }
  49     }
  50   else if (sym->st_shndx == SHN_UNDEF || sym->st_size == 0)
  51     {
  52       if (addr != value)
  53         return false;
  54     }
  55   else if (addr < value || addr >= value + sym->st_size)
  56     return false;
  57
  58   if (matchsym == NULL)
  59     return true;
  60
  61   ElfW(Addr) matchvalue = l->l_addr + matchsym->st_value;
  62   if (_dl_ppc64_is_opd_sym (l, matchsym)
  63       && (addr < matchvalue || addr > matchvalue + 24))
  64     matchvalue = *(ElfW(Addr) *) matchvalue;
  65
  66   return matchvalue < value;
  67 }
  68
  69 /* If this is a function symbol defined past the end of our dynamic
  70    section, then it must be a function descriptor.  Allow these symbols
  71    to match their associated function code range as well as the
  72    descriptor addresses.  */
  73 #undef DL_ADDR_SYM_MATCH
  74 #define DL_ADDR_SYM_MATCH(L, SYM, MATCHSYM, ADDR) \
  75   _dl_ppc64_addr_sym_match (L, SYM, MATCHSYM, ADDR)
  76
  77 #endif /* ldsodefs.h */