sysdeps/hppa/dl-lookupcfg.h

   1 /* Configuration of lookup functions.
   2    Copyright (C) 2000-2017 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 rtld_hidden_proto (_dl_symbol_address)
  29
  30 #define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref)
  31
  32 Elf32_Addr _dl_lookup_address (const void *address);
  33
  34 #define DL_LOOKUP_ADDRESS(addr) _dl_lookup_address ((const void *) addr)
  35
  36 void attribute_hidden _dl_unmap (struct link_map *map);
  37
  38 #define DL_UNMAP(map) _dl_unmap (map)
  39
  40 #define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr)                  \
  41   attr volatile unsigned int fptr[2];                                   \
  42  /* The test for "start & 2" below is to accommodate old binaries which \
  43     violated the ELF ABI by pointing DT_INIT and DT_FINI at a function  \
  44     descriptor.  */                                                     \
  45   if ((ElfW(Addr)) (start) & 2)                                         \
  46     addr = (ElfW(Addr)) start;                                          \
  47   else                                                                  \
  48     {                                                                   \
  49       fptr[0] = (unsigned int) (start);                                 \
  50       fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr;                   \
  51       /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */  \
  52       addr = (ElfW(Addr))((unsigned int)fptr | 2);                      \
  53     }                                                                   \
  54
  55 #define DL_CALL_DT_INIT(map, start, argc, argv, env)    \
  56 {                                                       \
  57   ElfW(Addr) addr;                                      \
  58   DL_DT_FUNCTION_ADDRESS(map, start, , addr)            \
  59   init_t init = (init_t) addr;                          \
  60   init (argc, argv, env);                               \
  61 }
  62
  63 #define DL_CALL_DT_FINI(map, start)             \
  64 {                                               \
  65   ElfW(Addr) addr;                              \
  66   DL_DT_FUNCTION_ADDRESS(map, start, , addr)    \
  67   fini_t fini = (fini_t) addr;                  \
  68   fini ();                                      \
  69 }
  70
  71 /* The type of the return value of fixup/profile_fixup */
  72 #define DL_FIXUP_VALUE_TYPE struct fdesc
  73
  74 /* Construct a fixup value from the address and linkmap */
  75 #define DL_FIXUP_MAKE_VALUE(map, addr) \
  76    ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr })
  77
  78 /* Extract the code address from a fixup value */
  79 #define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip)
  80 #define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value))
  81 #define DL_FIXUP_ADDR_VALUE(addr) (*(struct fdesc *) (addr))