Update.

1998-03-24  Ulrich Drepper  <drepper@cygnus.com>

	* elf/ldsodesf.h: New file.
	* elf/Makefile (distribute): Add ldsodefs.h.
	* elf/link.h: Separate internal information in exter header.
	* elf/rtld.c: Include elf/ldsodefs.h not link.h.
	* elf/dl-minimal.c: Likewise.
	* sysdeps/generic/dl-sysdep.c: Likewise.
	* elf/sprof.c: Likewise.
	* elf/dlsym.c: Likewise.
	* elf/dlvsym.c: Likewise.
	* elf/dlerror.c: Likewise.
	* elf/dladdr.c: Likewise.
	* elf/dlclose.c: Likewise.
	* elf/dlopen.c: Likewise.
	* elf/dl-addr.c: Likewise.
	* elf/dl-close.c: Likewise.
	* elf/dl-debug.c: Likewise.
	* elf/dl-deps.c: Likewise.
	* elf/dl-error.c: Likewise.
	* elf/dl-fini.c: Likewise.
	* elf/dl-init.c: Likewise.
	* elf/dl-load.c: Likewise.
	* elf/dl-lookup.c: Likewise.
	* elf/dl-object.c: Likewise.
	* elf/dl-open.c: Likewise.
	* elf/dl-profile.c: Likewise.
	* elf/dl-reloc.c: Likewise.
	* elf/dl-runtime.c: Likewise.
	* elf/dl-support.c: Likewise.
	* elf/dl-symbol.c: Likewise.
	* elf/dl-version.c: Likewise.
	* sysdeps/generic/dl-cache.c: Likewise.
	* sysdeps/generic/libc-start.c: Likewise.
	* iconv/gconv_dl.c: Likewise.
	* nss/nsswitch.c: Likewise.

1 files changed, 385 insertions, 0 deletions

diff --git a/elf/ldsodefs.h b/elf/ldsodefs.h
new file mode 100644
index 0000000..f6202ba
--- /dev/null
+++ b/elf/ldsodefs.h
@@ -0,0 +1,385 @@
+/* Run-time dynamic linker data structures for loaded ELF shared objects.
+   Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef	_LDSODEFS_H
+#define	_LDSODEFS_H	1
+
+#include <features.h>
+
+#define __need_size_t
+#define __need_NULL
+#include <stddef.h>
+
+#include <elf.h>
+#include <dlfcn.h>
+#include <link.h>
+
+__BEGIN_DECLS
+
+/* We use this macro to refer to ELF types independent of the native wordsize.
+   `ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'.  */
+#define ELFW(type)	_ElfW (ELF, __ELF_NATIVE_CLASS, type)
+
+/* For the version handling we need an array with only names and their
+   hash values.  */
+struct r_found_version
+  {
+    const char *name;
+    ElfW(Word) hash;
+
+    int hidden;
+    const char *filename;
+  };
+
+/* We want to cache information about the searches for shared objects.  */
+
+enum r_dir_status { unknown, nonexisting, existing };
+
+struct r_search_path_elem
+  {
+    const char *dirname;
+
+    size_t dirnamelen;
+    enum r_dir_status dirstatus;
+
+    size_t machdirnamelen;
+    enum r_dir_status machdirstatus;
+
+    /* Strings saying where the definition came from.  */
+    const char *what;
+    const char *where;
+
+    /* This link is only used in the `all_dirs' member of `r_search_path'.  */
+    struct r_search_path_elem *next;
+  };
+
+
+/* A data structure for a simple single linked list of strings.  */
+struct libname_list
+  {
+    const char *name;		/* Name requested (before search).  */
+    struct libname_list *next;	/* Link to next name for this object.  */
+  };
+
+
+/* Test whether given NAME matches any of the names of the given object.  */
+static __inline int
+__attribute__ ((unused))
+_dl_name_match_p (const char *__name, struct link_map *__map)
+{
+  int __found = strcmp (__name, __map->l_name) == 0;
+  struct libname_list *__runp = __map->l_libname;
+
+  while (! __found && __runp != NULL)
+    if (strcmp (__name, __runp->name) == 0)
+      __found = 1;
+    else
+      __runp = __runp->next;
+
+  return __found;
+}
+
+/* Function used as argument for `_dl_receive_error' function.  The
+   arguments are the error code, error string, and the objname the
+   error occurred in.  */
+typedef void (*receiver_fct) (int, const char *, const char *);
+
+/* Internal functions of the run-time dynamic linker.
+   These can be accessed if you link again the dynamic linker
+   as a shared library, as in `-lld' or `/lib/ld.so' explicitly;
+   but are not normally of interest to user programs.
+
+   The `-ldl' library functions in <dlfcn.h> provide a simple
+   user interface to run-time dynamic linking.  */
+
+
+/* Parameters passed to the dynamic linker.  */
+extern char **_dl_argv;
+
+/* Cached value of `getpagesize ()'.  */
+extern size_t _dl_pagesize;
+
+/* File descriptor referring to the zero-fill device.  */
+extern int _dl_zerofd;
+
+/* Name of the shared object to be profiled (if any).  */
+extern const char *_dl_profile;
+/* Map of shared object to be profiled.  */
+extern struct link_map *_dl_profile_map;
+
+/* If nonzero the appropriate debug information is printed.  */
+extern int _dl_debug_libs;
+extern int _dl_debug_impcalls;
+extern int _dl_debug_bindings;
+extern int _dl_debug_symbols;
+extern int _dl_debug_versions;
+extern int _dl_debug_reloc;
+extern int _dl_debug_files;
+
+/* File deccriptor to write debug messages to.  */
+extern int _dl_debug_fd;
+
+/* OS-dependent function to open the zero-fill device.  */
+extern int _dl_sysdep_open_zero_fill (void); /* dl-sysdep.c */
+
+/* OS-dependent function to write a message on the specified
+   descriptor FD.  All arguments are `const char *'; args until a null
+   pointer are concatenated to form the message to print.  */
+extern void _dl_sysdep_output (int fd, const char *string, ...);
+
+/* OS-dependent function to write a debug message on the specified
+   descriptor for this.  All arguments are `const char *'; args until
+   a null pointer are concatenated to form the message to print.  If
+   NEW_LINE is nonzero it is assumed that the message starts on a new
+   line.*/
+extern void _dl_debug_message (int new_line, const char *string, ...);
+
+/* OS-dependent function to write a message on the standard output.
+   All arguments are `const char *'; args until a null pointer
+   are concatenated to form the message to print.  */
+#define _dl_sysdep_message(string, args...) \
+  _dl_sysdep_output (STDOUT_FILENO, string, ##args)
+
+/* OS-dependent function to write a message on the standard error.
+   All arguments are `const char *'; args until a null pointer
+   are concatenated to form the message to print.  */
+#define _dl_sysdep_error(string, args...) \
+  _dl_sysdep_output (STDERR_FILENO, string, ##args)
+
+/* OS-dependent function to give a fatal error message and exit
+   when the dynamic linker fails before the program is fully linked.
+   All arguments are `const char *'; args until a null pointer
+   are concatenated to form the message to print.  */
+#define _dl_sysdep_fatal(string, args...) \
+  do									      \
+    {									      \
+      _dl_sysdep_output (STDERR_FILENO, string, ##args);		      \
+      _exit (127);							      \
+    }									      \
+  while (1)
+
+/* Nonzero if the program should be "secure" (i.e. it's setuid or somesuch).
+   This tells the dynamic linker to ignore environment variables.  */
+extern int _dl_secure;
+
+/* This function is called by all the internal dynamic linker functions
+   when they encounter an error.  ERRCODE is either an `errno' code or
+   zero; OBJECT is the name of the problematical shared object, or null if
+   it is a general problem; ERRSTRING is a string describing the specific
+   problem.  */
+extern void _dl_signal_error (int errcode,
+			      const char *object,
+			      const char *errstring);
+
+/* Call OPERATE, catching errors from `dl_signal_error'.  If there is no
+   error, *ERRSTRING is set to null.  If there is an error, *ERRSTRING is
+   set to a string constructed from the strings passed to _dl_signal_error,
+   and the error code passed is the return value.  ERRSTRING if nonzero
+   points to a malloc'ed string which the caller has to free after use.
+   ARGS is passed as argument to OPERATE.  */
+extern int _dl_catch_error (char **errstring,
+			    void (*operate) (void *),
+			    void *args);
+
+/* Call OPERATE, receiving errors from `dl_signal_error'.  Unlike
+   `_dl_catch_error' the operation is resumed after the OPERATE
+   function returns.
+   ARGS is passed as argument to OPERATE.  */
+extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *),
+			       void *args);
+
+
+/* Helper function for <dlfcn.h> functions.  Runs the OPERATE function via
+   _dl_catch_error.  Returns zero for success, nonzero for failure; and
+   arranges for `dlerror' to return the error details.
+   ARGS is passed as argument to OPERATE.  */
+extern int _dlerror_run (void (*operate) (void *), void *args);
+
+
+/* Open the shared object NAME and map in its segments.
+   LOADER's DT_RPATH is used in searching for NAME.
+   If the object is already opened, returns its existing map.
+   For preloaded shared objects PRELOADED is set to a non-zero
+   value to allow additional security checks.  */
+extern struct link_map *_dl_map_object (struct link_map *loader,
+					const char *name, int preloaded,
+					int type, int trace_mode);
+
+/* Call _dl_map_object on the dependencies of MAP, and set up
+   MAP->l_searchlist.  PRELOADS points to a vector of NPRELOADS previously
+   loaded objects that will be inserted into MAP->l_searchlist after MAP
+   but before its dependencies.  */
+extern void _dl_map_object_deps (struct link_map *map,
+				 struct link_map **preloads,
+				 unsigned int npreloads, int trace_mode);
+
+/* Cache the locations of MAP's hash table.  */
+extern void _dl_setup_hash (struct link_map *map);
+
+
+/* Open the shared object NAME, relocate it, and run its initializer if it
+   hasn't already been run.  MODE is as for `dlopen' (see <dlfcn.h>).  If
+   the object is already opened, returns its existing map.  */
+extern struct link_map *_dl_open (const char *name, int mode);
+
+/* Close an object previously opened by _dl_open.  */
+extern void _dl_close (struct link_map *map);
+
+
+/* Search loaded objects' symbol tables for a definition of the symbol
+   referred to by UNDEF.  *SYM is the symbol table entry containing the
+   reference; it is replaced with the defining symbol, and the base load
+   address of the defining object is returned.  SYMBOL_SCOPE is a
+   null-terminated list of object scopes to search; each object's
+   l_searchlist (i.e. the segment of the dependency tree starting at that
+   object) is searched in turn.  REFERENCE_NAME should name the object
+   containing the reference; it is used in error messages.
+   RELOC_TYPE is a machine-dependent reloc type, which is passed to
+   the `elf_machine_lookup_*_p' macros in dl-machine.h to affect which
+   symbols can be chosen.  */
+extern ElfW(Addr) _dl_lookup_symbol (const char *undef,
+				     const ElfW(Sym) **sym,
+				     struct link_map *symbol_scope[],
+				     const char *reference_name,
+				     int reloc_type);
+
+/* Lookup versioned symbol.  */
+extern ElfW(Addr) _dl_lookup_versioned_symbol (const char *undef,
+					       const ElfW(Sym) **sym,
+					       struct link_map *symbol_scope[],
+					       const char *reference_name,
+					       const struct r_found_version *version,
+					       int reloc_type);
+
+/* For handling RTLD_NEXT we must be able to skip shared objects.  */
+extern ElfW(Addr) _dl_lookup_symbol_skip (const char *undef,
+					  const ElfW(Sym) **sym,
+					  struct link_map *symbol_scope[],
+					  const char *reference_name,
+					  struct link_map *skip_this);
+
+/* For handling RTLD_NEXT with versioned symbols we must be able to
+   skip shared objects.  */
+extern ElfW(Addr) _dl_lookup_versioned_symbol_skip (const char *undef,
+						    const ElfW(Sym) **sym,
+						    struct link_map *symbol_scope[],
+						    const char *reference_name,
+						    const struct r_found_version *version,
+						    struct link_map *skip_this);
+
+/* Locate shared object containing the given address.  */
+extern int _dl_addr (const void *address, Dl_info *info);
+
+/* Look up symbol NAME in MAP's scope and return its run-time address.  */
+extern ElfW(Addr) _dl_symbol_value (struct link_map *map, const char *name);
+
+
+/* Structure describing the dynamic linker itself.  */
+extern struct link_map _dl_rtld_map;
+
+/* The list of objects currently loaded is the third element of the
+   `_dl_default_scope' array, and the fourth element is always null.
+   This leaves two slots before it that are used when resolving
+   DT_SYMBOLIC objects' references one after it for normal references
+   (see below).  */
+#define _dl_loaded	(_dl_default_scope[2])
+extern struct link_map *_dl_default_scope[5];
+
+/* Null-terminated list of objects in the dynamic `global scope'.  The
+   list starts at [2]; i.e. &_dl_global_scope[2] is the argument
+   passed to _dl_lookup_symbol to search the global scope.  To search
+   a specific object and its dependencies in preference to the global
+   scope, fill in the [1] slot and pass its address; for two specific
+   object scopes, fill [0] and [1].  The list is double-terminated; to
+   search the global scope and then a specific object and its
+   dependencies, set *_dl_global_scope_end.  This variable initially
+   points to _dl_default_scope, and _dl_loaded is always kept in [2]
+   of this list.  A new list is malloc'd when new objects are loaded
+   with RTLD_GLOBAL.  */
+extern struct link_map **_dl_global_scope, **_dl_global_scope_end;
+extern size_t _dl_global_scope_alloc; /* Number of slots malloc'd.  */
+
+/* Hack _dl_global_scope[0] and [1] as necessary, and return a pointer into
+   _dl_global_scope that should be passed to _dl_lookup_symbol for symbol
+   references made in the object MAP's relocations.  */
+extern struct link_map **_dl_object_relocation_scope (struct link_map *map);
+
+
+/* Allocate a `struct link_map' for a new object being loaded,
+   and enter it into the _dl_loaded list.  */
+extern struct link_map *_dl_new_object (char *realname, const char *libname,
+					int type);
+
+/* Relocate the given object (if it hasn't already been).
+   SCOPE is passed to _dl_lookup_symbol in symbol lookups.
+   If LAZY is nonzero, don't relocate its PLT.  */
+extern void _dl_relocate_object (struct link_map *map,
+				 struct link_map *scope[],
+				 int lazy);
+
+/* Check the version dependencies of all objects available through
+   MAP.  If VERBOSE print some more diagnostics.  */
+extern int _dl_check_all_versions (struct link_map *map, int verbose);
+
+/* Check the version dependencies for MAP.  If VERBOSE print some more
+   diagnostics.  */
+extern int _dl_check_map_versions (struct link_map *map, int verbose);
+
+/* Return the address of the next initializer function for MAP or one of
+   its dependencies that has not yet been run.  When there are no more
+   initializers to be run, this returns zero.  The functions are returned
+   in the order they should be called.  */
+extern ElfW(Addr) _dl_init_next (struct link_map *map);
+
+/* Call the finalizer functions of all shared objects whose
+   initializer functions have completed.  */
+extern void _dl_fini (void);
+
+/* The dynamic linker calls this function before and having changing
+   any shared object mappings.  The `r_state' member of `struct r_debug'
+   says what change is taking place.  This function's address is
+   the value of the `r_brk' member.  */
+extern void _dl_debug_state (void);
+
+/* Initialize `struct r_debug' if it has not already been done.  The
+   argument is the run-time load address of the dynamic linker, to be put
+   in the `r_ldbase' member.  Returns the address of the structure.  */
+extern struct r_debug *_dl_debug_initialize (ElfW(Addr) ldbase);
+
+/* Initialize the basic data structure for the search paths.  */
+extern void _dl_init_paths (const char *library_path);
+
+/* Gather the information needed to install the profiling tables and start
+   the timers.  */
+extern void _dl_start_profile (struct link_map *map, const char *output_dir);
+
+/* The actual functions used to keep book on the calls.  */
+extern void _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc);
+
+
+/* Show the members of the auxiliary array passed up from the kernel.  */
+extern void _dl_show_auxv (void);
+
+/* Return all environment variables starting with `LD_', one after the
+   other.  */
+extern char *_dl_next_ld_env_entry (char ***position);
+
+__END_DECLS
+
+#endif /* ldsodefs.h */