sysdeps/hppa/dl-lookupcfg.h

   1 /* Configuration of lookup functions.
   2    Copyright (C) 2000-2022 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    <https://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 rtld_hidden_proto (_dl_lookup_address)
  34
  35 #define DL_LOOKUP_ADDRESS(addr) _dl_lookup_address ((const void *) addr)
  36
  37 void attribute_hidden _dl_unmap (struct link_map *map);
  38
  39 #define DL_UNMAP(map) _dl_unmap (map)
  40
  41 #define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr)                  \
  42   attr volatile unsigned int fptr[2];                                   \
  43  /* The test for "start & 2" below is to accommodate old binaries which \
  44     violated the ELF ABI by pointing DT_INIT and DT_FINI at a function  \
  45     descriptor.  */                                                     \
  46   if ((ElfW(Addr)) (start) & 2)                                         \
  47     addr = (ElfW(Addr)) start;                                          \
  48   else                                                                  \
  49     {                                                                   \
  50       fptr[0] = (unsigned int) (start);                                 \
  51       fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr;                   \
  52       /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */  \
  53       addr = (ElfW(Addr))((unsigned int)fptr | 2);                      \
  54     }                                                                   \
  55
  56 #define DL_CALL_DT_INIT(map, start, argc, argv, env)    \
  57 {                                                       \
  58   ElfW(Addr) addr;                                      \
  59   DL_DT_FUNCTION_ADDRESS(map, start, , addr)            \
  60   dl_init_t init = (dl_init_t) addr;                    \
  61   init (argc, argv, env);                               \
  62 }
  63
  64 #define DL_CALL_DT_FINI(map, start)             \
  65 {                                               \
  66   ElfW(Addr) addr;                              \
  67   DL_DT_FUNCTION_ADDRESS(map, start, , addr)    \
  68   fini_t fini = (fini_t) addr;                  \
  69   fini ();                                      \
  70 }
  71
  72 /* The type of the return value of fixup/profile_fixup */
  73 #define DL_FIXUP_VALUE_TYPE struct fdesc
  74
  75 /* Construct a fixup value from the address and linkmap */
  76 #define DL_FIXUP_MAKE_VALUE(map, addr) \
  77   (map) ? ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr }) \
  78         : ((struct fdesc) { 0, 0 })
  79
  80 /* Extract the code address from a fixup value */
  81 #define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip)
  82 #define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value))
  83 /* Clear the plabel bit to get the actual address of the descriptor.  */
  84 #define DL_FIXUP_ADDR_VALUE(addr) \
  85   (*(DL_FIXUP_VALUE_TYPE *) ((uintptr_t) (addr) & ~2))
  86 #define DL_FIXUP_BINDNOW_ADDR_VALUE(addr) (addr)
  87 #define DL_FIXUP_BINDNOW_RELOC(value, new_value, st_value)      \
  88   *(value) = *(DL_FIXUP_VALUE_TYPE *) ((uintptr_t) (new_value) & ~2)