sysdeps/mips/do-lookup.h

   1 /* MIPS-specific veneer to GLIBC's do-lookup.h.
   2    Copyright (C) 2008 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 /* The semantics of zero/non-zero values of undefined symbols differs
  21    depending on whether the non-PIC ABI is in use.  Under the non-PIC ABI,
  22    a non-zero value indicates that there is an address reference to the
  23    symbol and thus it must always be resolved (except when resolving a jump
  24    slot relocation) to the PLT entry whose address is provided as the
  25    symbol's value; a zero value indicates that this canonical-address
  26    behaviour is not required.  Yet under the classic MIPS psABI, a zero value
  27    indicates that there is an address reference to the function and the
  28    dynamic linker must resolve the symbol immediately upon loading.  To
  29    avoid conflict, symbols for which the dynamic linker must assume the
  30    non-PIC ABI semantics are marked with the STO_MIPS_PLT flag.  The
  31    following ugly hack causes the code in the platform-independent
  32    do-lookup.h file to check this flag correctly.  */
  33 #define st_value st_shndx == SHN_UNDEF && !(sym->st_other & STO_MIPS_PLT)) \
  34                  || (sym->st_value
  35 #include_next "do-lookup.h"
  36 #undef st_value
  37