ports/sysdeps/hppa/dl-lookupcfg.h

   1 /* Configuration of lookup functions.
   2    Copyright (C) 2000-2013 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 #define ELF_FUNCTION_PTR_IS_SPECIAL
  20 #define DL_UNMAP_IS_SPECIAL
  21
  22 #include <dl-fptr.h>
  23
  24 /* Forward declaration.  */
  25 struct link_map;
  26
  27 void *_dl_symbol_address (struct link_map *map, const ElfW(Sym) *ref);
  28
  29 #define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref)
  30
  31 Elf32_Addr _dl_lookup_address (const void *address);
  32
  33 /* Clear the bottom two bits so generic code can find the fdesc entry */
  34 #define DL_LOOKUP_ADDRESS(addr) \
  35   (_dl_lookup_address ((void *)((unsigned long)addr & ~3)))
  36
  37 void _dl_unmap (struct link_map *map);
  38
  39 #define DL_UNMAP(map) _dl_unmap (map)
  40
  41 #define DL_AUTO_FUNCTION_ADDRESS(map, addr)                             \
  42 ({                                                                      \
  43   unsigned int fptr[2];                                                 \
  44   fptr[0] = (unsigned int) (addr);                                      \
  45   fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr;                       \
  46   /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */      \
  47   (ElfW(Addr))((unsigned int)fptr | 2);                                 \
  48 })
  49
  50 #define DL_STATIC_FUNCTION_ADDRESS(map, addr)                           \
  51 ({                                                                      \
  52   static unsigned int fptr[2];                                          \
  53   fptr[0] = (unsigned int) (addr);                                      \
  54   fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr;                       \
  55   /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */      \
  56   (ElfW(Addr))((unsigned int)fptr | 2);                                 \
  57 })
  58
  59
  60 /* The test for "addr & 2" below is to accomodate old binaries which
  61    violated the ELF ABI by pointing DT_INIT and DT_FINI at a function
  62    descriptor.  */
  63 #define DL_DT_INIT_ADDRESS(map, addr) \
  64   ((Elf32_Addr)(addr) & 2 ? (addr) : DL_AUTO_FUNCTION_ADDRESS (map, addr))
  65 #define DL_DT_FINI_ADDRESS(map, addr) \
  66   ((Elf32_Addr)(addr) & 2 ? (addr) : DL_AUTO_FUNCTION_ADDRESS (map, addr))
  67
  68 /* The type of the return value of fixup/profile_fixup */
  69 #define DL_FIXUP_VALUE_TYPE struct fdesc
  70
  71 /* Construct a fixup value from the address and linkmap */
  72 #define DL_FIXUP_MAKE_VALUE(map, addr) \
  73    ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr })
  74
  75 /* Extract the code address from a fixup value */
  76 #define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip)
  77 #define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value))
  78 #define DL_FIXUP_ADDR_VALUE(addr) (*(struct fdesc *) (addr))
  79