/* Inline functions for dynamic linking.

   Copyright (C) 1995-2018 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 macro is used as a callback from elf_machine_rel{a,} when a

   static TLS reloc is about to be performed.  Since (in dl-load.c) we

   permit dynamic loading of objects that might use such relocs, we

   have to check whether each use is actually doable.  If the object

   whose TLS segment the reference resolves to was allocated space in

   the static TLS block at startup, then it's ok.  Otherwise, we make

   an attempt to allocate it in surplus space on the fly.  If that

   can't be done, we fall back to the error that DF_STATIC_TLS is

   intended to produce.  */

#define HAVE_STATIC_TLS(map, sym_map)					\

    (__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET		\

		       && ((sym_map)->l_tls_offset			\

			   != FORCED_DYNAMIC_TLS_OFFSET), 1))

#define CHECK_STATIC_TLS(map, sym_map)					\

    do {								\

      if (!HAVE_STATIC_TLS (map, sym_map))				\

	_dl_allocate_static_tls (sym_map);				\

    } while (0)

#define TRY_STATIC_TLS(map, sym_map)					\

    (__builtin_expect ((sym_map)->l_tls_offset				\

		       != FORCED_DYNAMIC_TLS_OFFSET, 1)			\

     && (__builtin_expect ((sym_map)->l_tls_offset != NO_TLS_OFFSET, 1)	\

	 || _dl_try_allocate_static_tls (sym_map, true) == 0))

int _dl_try_allocate_static_tls (struct link_map *map, bool optional)

  attribute_hidden;

#include <elf.h>

#ifdef RESOLVE_MAP

/* We pass reloc_addr as a pointer to void, as opposed to a pointer to

   ElfW(Addr), because not all architectures can assume that the

   relocated address is properly aligned, whereas the compiler is

   entitled to assume that a pointer to a type is properly aligned for

   the type.  Even if we cast the pointer back to some other type with

   less strict alignment requirements, the compiler might still

   remember that the pointer was originally more aligned, thereby

   optimizing away alignment tests or using word instructions for

   copying memory, breaking the very code written to handle the

   unaligned cases.  */

# if ! ELF_MACHINE_NO_REL

auto inline void __attribute__((always_inline))

elf_machine_rel (struct link_map *map, const ElfW(Rel) *reloc,

		 const ElfW(Sym) *sym, const struct r_found_version *version,

		 void *const reloc_addr, int skip_ifunc);

auto inline void __attribute__((always_inline))

elf_machine_rel_relative (ElfW(Addr) l_addr, const ElfW(Rel) *reloc,

			  void *const reloc_addr);

# endif

# if ! ELF_MACHINE_NO_RELA

auto inline void __attribute__((always_inline))

elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,

		  const ElfW(Sym) *sym, const struct r_found_version *version,

		  void *const reloc_addr, int skip_ifunc);

auto inline void __attribute__((always_inline))

elf_machine_rela_relative (ElfW(Addr) l_addr, const ElfW(Rela) *reloc,

			   void *const reloc_addr);

# endif

# if ELF_MACHINE_NO_RELA || defined ELF_MACHINE_PLT_REL

auto inline void __attribute__((always_inline))

elf_machine_lazy_rel (struct link_map *map,

		      ElfW(Addr) l_addr, const ElfW(Rel) *reloc,

		      int skip_ifunc);

# else

auto inline void __attribute__((always_inline))

elf_machine_lazy_rel (struct link_map *map,

		      ElfW(Addr) l_addr, const ElfW(Rela) *reloc,

		      int skip_ifunc);

# endif

#endif

#include <dl-machine.h>

#include "get-dynamic-info.h"

#ifdef RESOLVE_MAP

# if defined RTLD_BOOTSTRAP || defined STATIC_PIE_BOOTSTRAP

#  define ELF_DURING_STARTUP (1)

# else

#  define ELF_DURING_STARTUP (0)

# endif

/* Get the definitions of `elf_dynamic_do_rel' and `elf_dynamic_do_rela'.

   These functions are almost identical, so we use cpp magic to avoid

   duplicating their code.  It cannot be done in a more general function

   because we must be able to completely inline.  */

/* On some machines, notably SPARC, DT_REL* includes DT_JMPREL in its

   range.  Note that according to the ELF spec, this is completely legal!

   We are guarenteed that we have one of three situations.  Either DT_JMPREL

   comes immediately after DT_REL*, or there is overlap and DT_JMPREL

   consumes precisely the very end of the DT_REL*, or DT_JMPREL and DT_REL*

   are completely separate and there is a gap between them.  */

# define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, do_lazy, skip_ifunc, test_rel) \

  do {									      \

    struct { ElfW(Addr) start, size;					      \

	     __typeof (((ElfW(Dyn) *) 0)->d_un.d_val) nrelative; int lazy; }  \

      ranges[2] = { { 0, 0, 0, 0 }, { 0, 0, 0, 0 } };			      \

									      \

    if ((map)->l_info[DT_##RELOC])					      \

      {									      \

	ranges[0].start = D_PTR ((map), l_info[DT_##RELOC]);		      \

	ranges[0].size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val;	      \

	if (map->l_info[VERSYMIDX (DT_##RELOC##COUNT)] != NULL)		      \

	  ranges[0].nrelative						      \

	    = map->l_info[VERSYMIDX (DT_##RELOC##COUNT)]->d_un.d_val;	      \

      }									      \

    if ((map)->l_info[DT_PLTREL]					      \

	&& (!test_rel || (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC)) \

      {									      \

	ElfW(Addr) start = D_PTR ((map), l_info[DT_JMPREL]);		      \

	ElfW(Addr) size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val;	      \

									      \

	if (ranges[0].start + ranges[0].size == (start + size))		      \

	  ranges[0].size -= size;					      \

	if (ELF_DURING_STARTUP						      \

	    || (!(do_lazy)						      \

		&& (ranges[0].start + ranges[0].size) == start))	      \

	  {								      \

	    /* Combine processing the sections.  */			      \

	    ranges[0].size += size;					      \

	  }								      \

	else								      \

	  {								      \

	    ranges[1].start = start;					      \

	    ranges[1].size = size;					      \

	    ranges[1].lazy = (do_lazy);					      \

	  }								      \

      }									      \

									      \

    if (ELF_DURING_STARTUP)						      \

      elf_dynamic_do_##reloc ((map), ranges[0].start, ranges[0].size,	      \

			      ranges[0].nrelative, 0, skip_ifunc);	      \

    else								      \

      {									      \

	int ranges_index;						      \

	for (ranges_index = 0; ranges_index < 2; ++ranges_index)	      \

	  elf_dynamic_do_##reloc ((map),				      \

				  ranges[ranges_index].start,		      \

				  ranges[ranges_index].size,		      \

				  ranges[ranges_index].nrelative,	      \

				  ranges[ranges_index].lazy,		      \

				  skip_ifunc);				      \

      }									      \

  } while (0)

# if ELF_MACHINE_NO_REL || ELF_MACHINE_NO_RELA

#  define _ELF_CHECK_REL 0

# else

#  define _ELF_CHECK_REL 1

# endif

# if ! ELF_MACHINE_NO_REL

#  include "do-rel.h"

#  define ELF_DYNAMIC_DO_REL(map, lazy, skip_ifunc) \

  _ELF_DYNAMIC_DO_RELOC (REL, Rel, map, lazy, skip_ifunc, _ELF_CHECK_REL)

# else

#  define ELF_DYNAMIC_DO_REL(map, lazy, skip_ifunc) /* Nothing to do.  */

# endif

# if ! ELF_MACHINE_NO_RELA

#  define DO_RELA

#  include "do-rel.h"

#  define ELF_DYNAMIC_DO_RELA(map, lazy, skip_ifunc) \

  _ELF_DYNAMIC_DO_RELOC (RELA, Rela, map, lazy, skip_ifunc, _ELF_CHECK_REL)

# else

#  define ELF_DYNAMIC_DO_RELA(map, lazy, skip_ifunc) /* Nothing to do.  */

# endif

/* This can't just be an inline function because GCC is too dumb

   to inline functions containing inlines themselves.  */

# define ELF_DYNAMIC_RELOCATE(map, lazy, consider_profile, skip_ifunc) \

  do {									      \

    int edr_lazy = elf_machine_runtime_setup ((map), (lazy),		      \

					      (consider_profile));	      \

    ELF_DYNAMIC_DO_REL ((map), edr_lazy, skip_ifunc);			      \

    ELF_DYNAMIC_DO_RELA ((map), edr_lazy, skip_ifunc);			      \

  } while (0)

#endif