dl-lookupcfg.h

/* Configuration of lookup functions.
   Copyright (C) 2000-2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <http://www.gnu.org/licenses/>.  */

#define ELF_FUNCTION_PTR_IS_SPECIAL
#define DL_UNMAP_IS_SPECIAL

#include <dl-fptr.h>

/* Forward declaration.  */
struct link_map;

void *_dl_symbol_address (struct link_map *map, const ElfW(Sym) *ref);

#define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref)

Elf32_Addr _dl_lookup_address (const void *address);

/* Clear the bottom two bits so generic code can find the fdesc entry */
#define DL_LOOKUP_ADDRESS(addr) \
  (_dl_lookup_address ((void *)((unsigned long)addr & ~3)))

void _dl_unmap (struct link_map *map);

#define DL_UNMAP(map) _dl_unmap (map)

#define DL_AUTO_FUNCTION_ADDRESS(map, addr)				\
({									\
  unsigned int fptr[2];							\
  fptr[0] = (unsigned int) (addr);					\
  fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr;			\
  /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */	\
  (ElfW(Addr))((unsigned int)fptr | 2);					\
})

#define DL_STATIC_FUNCTION_ADDRESS(map, addr)				\
({									\
  static unsigned int fptr[2];						\
  fptr[0] = (unsigned int) (addr);					\
  fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr;			\
  /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */	\
  (ElfW(Addr))((unsigned int)fptr | 2);					\
})


/* The test for "addr & 2" below is to accommodate old binaries which
   violated the ELF ABI by pointing DT_INIT and DT_FINI at a function
   descriptor.  */
#define DL_DT_INIT_ADDRESS(map, addr) \
  ((Elf32_Addr)(addr) & 2 ? (addr) : DL_AUTO_FUNCTION_ADDRESS (map, addr))
#define DL_DT_FINI_ADDRESS(map, addr) \
  ((Elf32_Addr)(addr) & 2 ? (addr) : DL_AUTO_FUNCTION_ADDRESS (map, addr))

/* The type of the return value of fixup/profile_fixup */
#define DL_FIXUP_VALUE_TYPE struct fdesc

/* Construct a fixup value from the address and linkmap */
#define DL_FIXUP_MAKE_VALUE(map, addr) \
   ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr })

/* Extract the code address from a fixup value */
#define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip)
#define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value))
#define DL_FIXUP_ADDR_VALUE(addr) (*(struct fdesc *) (addr))