sysdeps/unix/sysv/linux/ldsodefs.h

   1 /* Run-time dynamic linker data structures for loaded ELF shared objects.
   2    Copyright (C) 2001, 2002, 2003, 2006, 2009, 2010 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 #ifndef _LDSODEFS_H
  21
  22 #include <libc-abis.h>
  23 #include <kernel-features.h>
  24
  25 /* Get the real definitions.  */
  26 #include_next <ldsodefs.h>
  27
  28 /* Now define our stuff.  */
  29
  30 /* We have the auxiliary vector.  */
  31 #define HAVE_AUX_VECTOR
  32
  33 /* Used by static binaries to check the auxiliary vector.  */
  34 extern void _dl_aux_init (ElfW(auxv_t) *av) internal_function;
  35
  36 /* Initialization which is normally done by the dynamic linker.  */
  37 extern void _dl_non_dynamic_init (void) internal_function;
  38
  39 /* We can assume that the kernel always provides the AT_UID, AT_EUID,
  40    AT_GID, and AT_EGID values in the auxiliary vector from 2.4.0 or so on.  */
  41 #if __ASSUME_AT_XID
  42 # define HAVE_AUX_XID
  43 #endif
  44
  45 /* We can assume that the kernel always provides the AT_SECURE value
  46    in the auxiliary vector from 2.5.74 or so on.  */
  47 #if __ASSUME_AT_SECURE
  48 # define HAVE_AUX_SECURE
  49 #endif
  50
  51 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
  52    up the page size information.  */
  53 #if __ASSUME_AT_PAGESIZE
  54 # define HAVE_AUX_PAGESIZE
  55 #endif
  56
  57 /* Accept binaries which identify the binary as using Linux extensions.  */
  58 #define VALID_ELF_HEADER(hdr,exp,size)  (memcmp (hdr, exp, size) == 0   \
  59                                          || memcmp (hdr, expected2, size) == 0)
  60 #define VALID_ELF_OSABI(osabi)          (osabi == ELFOSABI_SYSV \
  61                                          || osabi == ELFOSABI_LINUX)
  62 #define VALID_ELF_ABIVERSION(osabi,ver) \
  63   (ver == 0 || (osabi == ELFOSABI_LINUX && ver < LIBC_ABI_MAX))
  64 #define MORE_ELF_HEADER_DATA \
  65   static const unsigned char expected2[EI_PAD] =        \
  66   {                                                     \
  67     [EI_MAG0] = ELFMAG0,                                \
  68     [EI_MAG1] = ELFMAG1,                                \
  69     [EI_MAG2] = ELFMAG2,                                \
  70     [EI_MAG3] = ELFMAG3,                                \
  71     [EI_CLASS] = ELFW(CLASS),                           \
  72     [EI_DATA] = byteorder,                              \
  73     [EI_VERSION] = EV_CURRENT,                          \
  74     [EI_OSABI] = ELFOSABI_LINUX                         \
  75   }
  76
  77 #endif /* ldsodefs.h */