/* Read the dynamic section at DYN and fill in INFO with indices DT_*.

   Copyright (C) 2012-2018 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/>.  */

/* This file is included multiple times and therefore lacks a header

   file inclusion guard.  */

#include <assert.h>

#include <libc-diag.h>

#ifndef RESOLVE_MAP

static

#else

auto

#endif

inline void __attribute__ ((unused, always_inline))

elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)

{

  ElfW(Dyn) *dyn = l->l_ld;

  ElfW(Dyn) **info;

#if __ELF_NATIVE_CLASS == 32

  typedef Elf32_Word d_tag_utype;

#elif __ELF_NATIVE_CLASS == 64

  typedef Elf64_Xword d_tag_utype;

#endif

#if !defined RTLD_BOOTSTRAP && !defined STATIC_PIE_BOOTSTRAP

  if (dyn == NULL)

    return;

#endif

  info = l->l_info;

  while (dyn->d_tag != DT_NULL)

    {

      if ((d_tag_utype) dyn->d_tag < DT_NUM)

	info[dyn->d_tag] = dyn;

      else if (dyn->d_tag >= DT_LOPROC &&

	       dyn->d_tag < DT_LOPROC + DT_THISPROCNUM)

	{

	  /* This does not violate the array bounds of l->l_info, but

	     gcc 4.6 on sparc somehow does not see this.  */

	  DIAG_PUSH_NEEDS_COMMENT;

	  DIAG_IGNORE_NEEDS_COMMENT (4.6,

				     "-Warray-bounds");

	  info[dyn->d_tag - DT_LOPROC + DT_NUM] = dyn;

	  DIAG_POP_NEEDS_COMMENT;

	}

      else if ((d_tag_utype) DT_VERSIONTAGIDX (dyn->d_tag) < DT_VERSIONTAGNUM)

	info[VERSYMIDX (dyn->d_tag)] = dyn;

      else if ((d_tag_utype) DT_EXTRATAGIDX (dyn->d_tag) < DT_EXTRANUM)

	info[DT_EXTRATAGIDX (dyn->d_tag) + DT_NUM + DT_THISPROCNUM

	     + DT_VERSIONTAGNUM] = dyn;

      else if ((d_tag_utype) DT_VALTAGIDX (dyn->d_tag) < DT_VALNUM)

	info[DT_VALTAGIDX (dyn->d_tag) + DT_NUM + DT_THISPROCNUM

	     + DT_VERSIONTAGNUM + DT_EXTRANUM] = dyn;

      else if ((d_tag_utype) DT_ADDRTAGIDX (dyn->d_tag) < DT_ADDRNUM)

	info[DT_ADDRTAGIDX (dyn->d_tag) + DT_NUM + DT_THISPROCNUM

	     + DT_VERSIONTAGNUM + DT_EXTRANUM + DT_VALNUM] = dyn;

      ++dyn;

    }

#define DL_RO_DYN_TEMP_CNT	8

#ifndef DL_RO_DYN_SECTION

  /* Don't adjust .dynamic unnecessarily.  */

  if (l->l_addr != 0)

    {

      ElfW(Addr) l_addr = l->l_addr;

      int cnt = 0;

# define ADJUST_DYN_INFO(tag) \

      do								      \

	if (info[tag] != NULL)						      \

	  {								      \

	    if (temp)							      \

	      {								      \

		temp[cnt].d_tag = info[tag]->d_tag;			      \

		temp[cnt].d_un.d_ptr = info[tag]->d_un.d_ptr + l_addr;	      \

		info[tag] = temp + cnt++;				      \

	      }								      \

	    else							      \

	      info[tag]->d_un.d_ptr += l_addr;				      \

	  }								      \

      while (0)

      ADJUST_DYN_INFO (DT_HASH);

      ADJUST_DYN_INFO (DT_PLTGOT);

      ADJUST_DYN_INFO (DT_STRTAB);

      ADJUST_DYN_INFO (DT_SYMTAB);

# if ! ELF_MACHINE_NO_RELA

      ADJUST_DYN_INFO (DT_RELA);

# endif

# if ! ELF_MACHINE_NO_REL

      ADJUST_DYN_INFO (DT_REL);

# endif

      ADJUST_DYN_INFO (DT_JMPREL);

      ADJUST_DYN_INFO (VERSYMIDX (DT_VERSYM));

      ADJUST_DYN_INFO (ADDRIDX (DT_GNU_HASH));

# undef ADJUST_DYN_INFO

      assert (cnt <= DL_RO_DYN_TEMP_CNT);

    }

#endif

  if (info[DT_PLTREL] != NULL)

    {

#if ELF_MACHINE_NO_RELA

      assert (info[DT_PLTREL]->d_un.d_val == DT_REL);

#elif ELF_MACHINE_NO_REL

      assert (info[DT_PLTREL]->d_un.d_val == DT_RELA);

#else

      assert (info[DT_PLTREL]->d_un.d_val == DT_REL

	      || info[DT_PLTREL]->d_un.d_val == DT_RELA);

#endif

    }

#if ! ELF_MACHINE_NO_RELA

  if (info[DT_RELA] != NULL)

    assert (info[DT_RELAENT]->d_un.d_val == sizeof (ElfW(Rela)));

# endif

# if ! ELF_MACHINE_NO_REL

  if (info[DT_REL] != NULL)

    assert (info[DT_RELENT]->d_un.d_val == sizeof (ElfW(Rel)));

#endif

#ifdef RTLD_BOOTSTRAP

  /* Only the bind now flags are allowed.  */

  assert (info[VERSYMIDX (DT_FLAGS_1)] == NULL

	  || (info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val & ~DF_1_NOW) == 0);

  /* Flags must not be set for ld.so.  */

  assert (info[DT_FLAGS] == NULL

	  || (info[DT_FLAGS]->d_un.d_val & ~DF_BIND_NOW) == 0);

#endif

#if defined RTLD_BOOTSTRAP || defined STATIC_PIE_BOOTSTRAP

  assert (info[DT_RUNPATH] == NULL);

  assert (info[DT_RPATH] == NULL);

#else

  if (info[DT_FLAGS] != NULL)

    {

      /* Flags are used.  Translate to the old form where available.

	 Since these l_info entries are only tested for NULL pointers it

	 is ok if they point to the DT_FLAGS entry.  */

      l->l_flags = info[DT_FLAGS]->d_un.d_val;

      if (l->l_flags & DF_SYMBOLIC)

	info[DT_SYMBOLIC] = info[DT_FLAGS];

      if (l->l_flags & DF_TEXTREL)

	info[DT_TEXTREL] = info[DT_FLAGS];

      if (l->l_flags & DF_BIND_NOW)

	info[DT_BIND_NOW] = info[DT_FLAGS];

    }

  if (info[VERSYMIDX (DT_FLAGS_1)] != NULL)

    {

      l->l_flags_1 = info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val;

      /* Only DT_1_SUPPORTED_MASK bits are supported, and we would like

	 to assert this, but we can't. Users have been setting

	 unsupported DF_1_* flags for a long time and glibc has ignored

	 them. Therefore to avoid breaking existing applications the

	 best we can do is add a warning during debugging with the

	 intent of notifying the user of the problem.  */

      if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0)

	  && l->l_flags_1 & ~DT_1_SUPPORTED_MASK)

	_dl_debug_printf ("\nWARNING: Unsupported flag value(s) of 0x%x in DT_FLAGS_1.\n",

			  l->l_flags_1 & ~DT_1_SUPPORTED_MASK);

      if (l->l_flags_1 & DF_1_NOW)

	info[DT_BIND_NOW] = info[VERSYMIDX (DT_FLAGS_1)];

    }

  if (info[DT_RUNPATH] != NULL)

    /* If both RUNPATH and RPATH are given, the latter is ignored.  */

    info[DT_RPATH] = NULL;

#endif

}