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+/* Data structure for communication from the run-time dynamic linker for
+   loaded ELF shared objects.
+   Copyright (C) 1995-2017 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/>.  */
+
+#ifndef	_PRIVATE_LINK_H
+#define	_PRIVATE_LINK_H	1
+
+#ifdef _LINK_H
+# error this should be impossible
+#endif
+
+# ifndef _ISOMAC
+/* Get most of the contents from the public header, but we define a
+   different `struct link_map' type for private use.  The la_objopen
+   prototype uses the type, so we have to declare it separately.  */
+#  define link_map	link_map_public
+#  define la_objopen	la_objopen_wrongproto
+# endif
+
+#include <elf/link.h>
+
+# ifndef _ISOMAC
+
+#undef	link_map
+#undef	la_objopen
+
+struct link_map;
+extern unsigned int la_objopen (struct link_map *__map, Lmid_t __lmid,
+				uintptr_t *__cookie);
+
+#include <stdint.h>
+#include <stddef.h>
+#include <linkmap.h>
+#include <dl-fileid.h>
+#include <dl-lookupcfg.h>
+#include <tls.h>
+#include <libc-lock.h>
+
+
+/* Some internal data structures of the dynamic linker used in the
+   linker map.  We only provide forward declarations.  */
+struct libname_list;
+struct r_found_version;
+struct r_search_path_elem;
+
+/* Forward declaration.  */
+struct link_map;
+
+/* Structure to describe a single list of scope elements.  The lookup
+   functions get passed an array of pointers to such structures.  */
+struct r_scope_elem
+{
+  /* Array of maps for the scope.  */
+  struct link_map **r_list;
+  /* Number of entries in the scope.  */
+  unsigned int r_nlist;
+};
+
+
+/* Structure to record search path and allocation mechanism.  */
+struct r_search_path_struct
+  {
+    struct r_search_path_elem **dirs;
+    int malloced;
+  };
+
+
+/* Structure describing a loaded shared object.  The `l_next' and `l_prev'
+   members form a chain of all the shared objects loaded at startup.
+
+   These data structures exist in space used by the run-time dynamic linker;
+   modifying them may have disastrous results.
+
+   This data structure might change in future, if necessary.  User-level
+   programs must avoid defining objects of this type.  */
+
+struct link_map
+  {
+    /* These first few members are part of the protocol with the debugger.
+       This is the same format used in SVR4.  */
+
+    ElfW(Addr) l_addr;		/* Difference between the address in the ELF
+				   file and the addresses in memory.  */
+    char *l_name;		/* Absolute file name object was found in.  */
+    ElfW(Dyn) *l_ld;		/* Dynamic section of the shared object.  */
+    struct link_map *l_next, *l_prev; /* Chain of loaded objects.  */
+
+    /* All following members are internal to the dynamic linker.
+       They may change without notice.  */
+
+    /* This is an element which is only ever different from a pointer to
+       the very same copy of this type for ld.so when it is used in more
+       than one namespace.  */
+    struct link_map *l_real;
+
+    /* Number of the namespace this link map belongs to.  */
+    Lmid_t l_ns;
+
+    struct libname_list *l_libname;
+    /* Indexed pointers to dynamic section.
+       [0,DT_NUM) are indexed by the processor-independent tags.
+       [DT_NUM,DT_NUM+DT_THISPROCNUM) are indexed by the tag minus DT_LOPROC.
+       [DT_NUM+DT_THISPROCNUM,DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM) are
+       indexed by DT_VERSIONTAGIDX(tagvalue).
+       [DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM,
+	DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM) are indexed by
+       DT_EXTRATAGIDX(tagvalue).
+       [DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM,
+	DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM+DT_VALNUM) are
+       indexed by DT_VALTAGIDX(tagvalue) and
+       [DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM+DT_VALNUM,
+	DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM+DT_VALNUM+DT_ADDRNUM)
+       are indexed by DT_ADDRTAGIDX(tagvalue), see <elf.h>.  */
+
+    ElfW(Dyn) *l_info[DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM
+		      + DT_EXTRANUM + DT_VALNUM + DT_ADDRNUM];
+    const ElfW(Phdr) *l_phdr;	/* Pointer to program header table in core.  */
+    ElfW(Addr) l_entry;		/* Entry point location.  */
+    ElfW(Half) l_phnum;		/* Number of program header entries.  */
+    ElfW(Half) l_ldnum;		/* Number of dynamic segment entries.  */
+
+    /* Array of DT_NEEDED dependencies and their dependencies, in
+       dependency order for symbol lookup (with and without
+       duplicates).  There is no entry before the dependencies have
+       been loaded.  */
+    struct r_scope_elem l_searchlist;
+
+    /* We need a special searchlist to process objects marked with
+       DT_SYMBOLIC.  */
+    struct r_scope_elem l_symbolic_searchlist;
+
+    /* Dependent object that first caused this object to be loaded.  */
+    struct link_map *l_loader;
+
+    /* Array with version names.  */
+    struct r_found_version *l_versions;
+    unsigned int l_nversions;
+
+    /* Symbol hash table.  */
+    Elf_Symndx l_nbuckets;
+    Elf32_Word l_gnu_bitmask_idxbits;
+    Elf32_Word l_gnu_shift;
+    const ElfW(Addr) *l_gnu_bitmask;
+    union
+    {
+      const Elf32_Word *l_gnu_buckets;
+      const Elf_Symndx *l_chain;
+    };
+    union
+    {
+      const Elf32_Word *l_gnu_chain_zero;
+      const Elf_Symndx *l_buckets;
+    };
+
+    unsigned int l_direct_opencount; /* Reference count for dlopen/dlclose.  */
+    enum			/* Where this object came from.  */
+      {
+	lt_executable,		/* The main executable program.  */
+	lt_library,		/* Library needed by main executable.  */
+	lt_loaded		/* Extra run-time loaded shared object.  */
+      } l_type:2;
+    unsigned int l_relocated:1;	/* Nonzero if object's relocations done.  */
+    unsigned int l_init_called:1; /* Nonzero if DT_INIT function called.  */
+    unsigned int l_global:1;	/* Nonzero if object in _dl_global_scope.  */
+    unsigned int l_reserved:2;	/* Reserved for internal use.  */
+    unsigned int l_phdr_allocated:1; /* Nonzero if the data structure pointed
+					to by `l_phdr' is allocated.  */
+    unsigned int l_soname_added:1; /* Nonzero if the SONAME is for sure in
+				      the l_libname list.  */
+    unsigned int l_faked:1;	/* Nonzero if this is a faked descriptor
+				   without associated file.  */
+    unsigned int l_need_tls_init:1; /* Nonzero if GL(dl_init_static_tls)
+				       should be called on this link map
+				       when relocation finishes.  */
+    unsigned int l_auditing:1;	/* Nonzero if the DSO is used in auditing.  */
+    unsigned int l_audit_any_plt:1; /* Nonzero if at least one audit module
+				       is interested in the PLT interception.*/
+    unsigned int l_removed:1;	/* Nozero if the object cannot be used anymore
+				   since it is removed.  */
+    unsigned int l_contiguous:1; /* Nonzero if inter-segment holes are
+				    mprotected or if no holes are present at
+				    all.  */
+    unsigned int l_symbolic_in_local_scope:1; /* Nonzero if l_local_scope
+						 during LD_TRACE_PRELINKING=1
+						 contains any DT_SYMBOLIC
+						 libraries.  */
+    unsigned int l_free_initfini:1; /* Nonzero if l_initfini can be
+				       freed, ie. not allocated with
+				       the dummy malloc in ld.so.  */
+
+    /* Collected information about own RPATH directories.  */
+    struct r_search_path_struct l_rpath_dirs;
+
+    /* Collected results of relocation while profiling.  */
+    struct reloc_result
+    {
+      DL_FIXUP_VALUE_TYPE addr;
+      struct link_map *bound;
+      unsigned int boundndx;
+      uint32_t enterexit;
+      unsigned int flags;
+    } *l_reloc_result;
+
+    /* Pointer to the version information if available.  */
+    ElfW(Versym) *l_versyms;
+
+    /* String specifying the path where this object was found.  */
+    const char *l_origin;
+
+    /* Start and finish of memory map for this object.  l_map_start
+       need not be the same as l_addr.  */
+    ElfW(Addr) l_map_start, l_map_end;
+    /* End of the executable part of the mapping.  */
+    ElfW(Addr) l_text_end;
+
+    /* Default array for 'l_scope'.  */
+    struct r_scope_elem *l_scope_mem[4];
+    /* Size of array allocated for 'l_scope'.  */
+    size_t l_scope_max;
+    /* This is an array defining the lookup scope for this link map.
+       There are initially at most three different scope lists.  */
+    struct r_scope_elem **l_scope;
+
+    /* A similar array, this time only with the local scope.  This is
+       used occasionally.  */
+    struct r_scope_elem *l_local_scope[2];
+
+    /* This information is kept to check for sure whether a shared
+       object is the same as one already loaded.  */
+    struct r_file_id l_file_id;
+
+    /* Collected information about own RUNPATH directories.  */
+    struct r_search_path_struct l_runpath_dirs;
+
+    /* List of object in order of the init and fini calls.  */
+    struct link_map **l_initfini;
+
+    /* List of the dependencies introduced through symbol binding.  */
+    struct link_map_reldeps
+      {
+	unsigned int act;
+	struct link_map *list[];
+      } *l_reldeps;
+    unsigned int l_reldepsmax;
+
+    /* Nonzero if the DSO is used.  */
+    unsigned int l_used;
+
+    /* Various flag words.  */
+    ElfW(Word) l_feature_1;
+    ElfW(Word) l_flags_1;
+    ElfW(Word) l_flags;
+
+    /* Temporarily used in `dl_close'.  */
+    int l_idx;
+
+    struct link_map_machine l_mach;
+
+    struct
+    {
+      const ElfW(Sym) *sym;
+      int type_class;
+      struct link_map *value;
+      const ElfW(Sym) *ret;
+    } l_lookup_cache;
+
+    /* Thread-local storage related info.  */
+
+    /* Start of the initialization image.  */
+    void *l_tls_initimage;
+    /* Size of the initialization image.  */
+    size_t l_tls_initimage_size;
+    /* Size of the TLS block.  */
+    size_t l_tls_blocksize;
+    /* Alignment requirement of the TLS block.  */
+    size_t l_tls_align;
+    /* Offset of first byte module alignment.  */
+    size_t l_tls_firstbyte_offset;
+#ifndef NO_TLS_OFFSET
+# define NO_TLS_OFFSET	0
+#endif
+#ifndef FORCED_DYNAMIC_TLS_OFFSET
+# if NO_TLS_OFFSET == 0
+#  define FORCED_DYNAMIC_TLS_OFFSET -1
+# elif NO_TLS_OFFSET == -1
+#  define FORCED_DYNAMIC_TLS_OFFSET -2
+# else
+#  error "FORCED_DYNAMIC_TLS_OFFSET is not defined"
+# endif
+#endif
+    /* For objects present at startup time: offset in the static TLS block.  */
+    ptrdiff_t l_tls_offset;
+    /* Index of the module in the dtv array.  */
+    size_t l_tls_modid;
+
+    /* Number of thread_local objects constructed by this DSO.  This is
+       atomically accessed and modified and is not always protected by the load
+       lock.  See also: CONCURRENCY NOTES in cxa_thread_atexit_impl.c.  */
+    size_t l_tls_dtor_count;
+
+    /* Information used to change permission after the relocations are
+       done.  */
+    ElfW(Addr) l_relro_addr;
+    size_t l_relro_size;
+
+    unsigned long long int l_serial;
+
+    /* Audit information.  This array apparent must be the last in the
+       structure.  Never add something after it.  */
+    struct auditstate
+    {
+      uintptr_t cookie;
+      unsigned int bindflags;
+    } l_audit[0];
+  };
+
+
+#if __ELF_NATIVE_CLASS == 32
+# define symbind symbind32
+#elif __ELF_NATIVE_CLASS == 64
+# define symbind symbind64
+#else
+# error "__ELF_NATIVE_CLASS must be defined"
+#endif
+
+extern int __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
+					       size_t size, void *data),
+			      void *data);
+
+/* We use this macro to refer to ELF macros independent of the native
+   wordsize.  `ELFW(R_TYPE)' is used in place of `ELF32_R_TYPE' or
+   `ELF64_R_TYPE'.  */
+#define ELFW(type)	_ElfW (ELF, __ELF_NATIVE_CLASS, type)
+
+# endif /* !_ISOMAC */
+#endif /* include/link.h */