glibc/elf/rtld.c
Ulrich Drepper 762a2918ee Update.
1997-07-06 23:36  Ulrich Drepper  <drepper@cygnus.com>

	* isomac.c (get_null_defines): Put NULL at end of list.

	* hurd/Makefile: Remove special handling of sunrpc code.
	* sysdeps/mach/hurd/Makefile: Likewise.
	Compile CThreads code.
	* sunrpc/rpc_main.c: Don't use MAXPATHLEN.
	* sysdeps/mach/bits/libc-lock.h: Add definitions for key handling
	functions.
	* sysdeps/stub/bits/libc-lock.h: Likewise.
	* sysdeps/mach/hurd/net/ethernet.h: New file.
	* sysdeps/mach/hurd/net/if.h: New file.
	* sysdeps/mach/hurd/net/if_arp.h: New file.
	* sysdeps/mach/hurd/net/if_ether.h: New file.
	* sysdeps/mach/hurd/net/if_ppp.h: New file.
	* sysdeps/mach/hurd/net/route.h: New file.
	Patches by  Fila Kolodny <fila@ibi.com>.

	* math/fenv-test.c: Add more tests.
	Patch by Andreas Jaeger <aj@arthur.rhein-neckar.de>.

	* sysdeps/wordsize-32/inttypes.h: Correct values for INTFAST_MIN,
	INTFAST_MAX, and UINTFAST_MAX.
	* sysdeps/wordsize-64/inttypes.h: Likewise.
	Correct intmax_t definition.

1997-07-04 15:33  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* elf/rtld.c (dl_main): Add '\n' to _dl_sysdep_fatal ().

1997-07-01 09:18  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* libc.map: Add missing symbol.

1997-07-04 18:04  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* stdlib/tst-strtol.c: Don't assume cpp takes ~0UL as long
	in cc1.  Cpp in gcc doesn't do it.

1997-07-01 21:15  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* libio/libioP.h: Remove second definition of _IO_file_attach.

	* sysdeps/i386/fpu/fraiseexcpt.c (feraiseexcept): Correct comments.

	* sysdeps/sparc64/elf/start.S (_start): Update and reformat
	copyright.
	* manual/summary.awk: Likewise.
	* misc/bits/stab.def: Likewise.
	* posix/glob/Makefile.ami: Likewise.
	* posix/glob/Makefile.in: Likewise.
	* posix/glob/SMakefile: Likewise.
	* sysdeps/gnu/errlist.awk: Likewise.
	* sysdeps/mach/hurd/errnos.awk: Likewise.
	* sysdeps/standalone/i386/force_cpu386/target.ld: Likewise.
	* sysdeps/standalone/m68k/m68020/mvme136/mvme136.ld: Likewise.
	* sysdeps/unix/snarf-ioctls: Likewise.
	* sysdeps/vax/setjmp.c: Likewise.

1997-07-05 11:56  Ulrich Drepper  <drepper@cygnus.com>

	* login/login.c (tty_name): Use newly allocated buffer.
	Patch by Jaakko Hyvätti <jaakko.hyvatti@iki.fi>.

	* time/asctime.c: Never translate week and month name according
	to LC_TIME.  Patch by Paul Eggert <eggert@twinsun.com>.

1997-07-03 22:50  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* locale/setlocale.c (setname): Do nothing when reusing the same
	name.

1997-07-03 20:18  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* libc.map: Add global variables of malloc.

1997-07-03 13:24  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* elf/dl-version.c (find_needed): Look for needed objects also in
	the dependency list of the current object.  Added new parameter to
	find its link map, caller changed.

1997-07-03 12:33  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/m68k/fpu/fraiseexcpt.c: Correct the FE_INEXACT and
	FE_UNDERFLOW cases.

1997-07-01 13:36  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* elf/link.h: Remove final comma from enumerator list, forbidden
	by ISO C.  Use __inline instead of inline.

1997-07-01 16:40  Thomas Bushnell, n/BSG  <thomas@gnu.ai.mit.edu>

	* hurd/hurdsig.c: Include <hurd/id.h>.
	(reauth_proc): Call proc_setowner appropriately too.

1997-07-01 09:18  H.J. Lu  <hjl@gnu.ai.mit.edu>

	* libc.map: Add missing symbol.

1997-06-30 12:12  Fila Kolodny  <fila@ibi.com>

	* sysdeps/mach/hurd/fchdir.c: Make fchdir a weak alias of __fchdir.
	* sysdeps/mach/hurd/getpeername.c (getpeername): Remove spurious
	declaration of addr.

1997-06-29 17:56  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* manual/argp.texi (Argp Option Vectors): Fix use of @math to make
	it work in TeX.

1997-06-27 21:25  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* Makeconfig (+includes): Add include directory to include path.
	* configure.in (sysnames): Don't add it here.
	* Makefile (subdir-dirs): Define and add it to vpath for headers.
	* Make-dist (all-headers): Look in include directory for
	indirection headers.  Filter out header names pointing outside the
	source directory.

	* Makefile (distribute): Remove ansidecl.h, add libc.map.
	* Make-dist (+tsrcs): Add version scripts for extra libraries.
	* Makerules (distinfo-vars): Add %-map for extra libraries.

	* sysdeps/unix/sysv/linux/alpha/Dist: Rename sys/kernel_termios.h
	to kernel_termios.h.
	* sysdeps/unix/sysv/linux/powerpc/Dist: Remove ioctl-types.h,
	termbits.h and sys/kernel_termios.h.
	* sysdeps/mips/mips64/Dist: New file.
	* sysdeps/unix/sysv/linux/Dist: Add stdio_lim.h.in.

1997-06-29 23:03  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* math/test-fenv.c (feenv_nomask_test): New test for non masked
	exceptions.
	(feenv_mask_test): New test for masked exceptions
	(feenv_tests): New function calls feenv_nomask_test and
	feenv_mask_test.
	(main): Call new tests.
	(initial_tests): New test for initilisation.
1997-07-06 22:02:42 +00:00

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/* Run time dynamic linker.
Copyright (C) 1995, 1996, 1997 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. */
#include <link.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h> /* Check if MAP_ANON is defined. */
#include <stdio-common/_itoa.h>
#include <assert.h>
#include "dynamic-link.h"
/* System-specific function to do initial startup for the dynamic linker.
After this, file access calls and getenv must work. This is responsible
for setting __libc_enable_secure if we need to be secure (e.g. setuid),
and for setting _dl_argc and _dl_argv, and then calling _dl_main. */
extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
void (*dl_main) (const ElfW(Phdr) *phdr,
ElfW(Half) phent,
ElfW(Addr) *user_entry));
extern void _dl_sysdep_start_cleanup (void);
/* System-dependent function to read a file's whole contents
in the most convenient manner available. */
extern void *_dl_sysdep_read_whole_file (const char *filename,
size_t *filesize_ptr,
int mmap_prot);
/* Helper function to handle errors while resolving symbols. */
static void print_unresolved (int errcode, const char *objname,
const char *errsting);
/* Helper function to handle errors when a version is missing. */
static void print_missing_version (int errcode, const char *objname,
const char *errsting);
int _dl_argc;
char **_dl_argv;
const char *_dl_rpath;
int _dl_verbose;
/* Set nonzero during loading and initialization of executable and
libraries, cleared before the executable's entry point runs. This
must not be initialized to nonzero, because the unused dynamic
linker loaded in for libc.so's "ld.so.1" dep will provide the
definition seen by libc.so's initializer; that value must be zero,
and will be since that dynamic linker's _dl_start and dl_main will
never be called. */
int _dl_starting_up;
static void dl_main (const ElfW(Phdr) *phdr,
ElfW(Half) phent,
ElfW(Addr) *user_entry);
struct link_map _dl_rtld_map;
struct libname_list _dl_rtld_libname;
#ifdef RTLD_START
RTLD_START
#else
#error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START"
#endif
static ElfW(Addr)
_dl_start (void *arg)
{
struct link_map bootstrap_map;
/* This #define produces dynamic linking inline functions for
bootstrap relocation instead of general-purpose relocation. */
#define RTLD_BOOTSTRAP
#define RESOLVE(sym, version, flags) bootstrap_map.l_addr
#include "dynamic-link.h"
/* Figure out the run-time load address of the dynamic linker itself. */
bootstrap_map.l_addr = elf_machine_load_address ();
/* Read our own dynamic section and fill in the info array. */
bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic ();
elf_get_dynamic_info (bootstrap_map.l_ld, bootstrap_map.l_info);
#ifdef ELF_MACHINE_BEFORE_RTLD_RELOC
ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info);
#endif
/* Relocate ourselves so we can do normal function calls and
data access using the global offset table. */
ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0);
/* Now life is sane; we can call functions and access global data.
Set up to use the operating system facilities, and find out from
the operating system's program loader where to find the program
header table in core. */
/* Transfer data about ourselves to the permanent link_map structure. */
_dl_rtld_map.l_addr = bootstrap_map.l_addr;
_dl_rtld_map.l_ld = bootstrap_map.l_ld;
memcpy (_dl_rtld_map.l_info, bootstrap_map.l_info,
sizeof _dl_rtld_map.l_info);
_dl_setup_hash (&_dl_rtld_map);
/* Cache the DT_RPATH stored in ld.so itself; this will be
the default search path. */
_dl_rpath = (void *) (_dl_rtld_map.l_addr +
_dl_rtld_map.l_info[DT_STRTAB]->d_un.d_ptr +
_dl_rtld_map.l_info[DT_RPATH]->d_un.d_val);
/* Call the OS-dependent function to set up life so we can do things like
file access. It will call `dl_main' (below) to do all the real work
of the dynamic linker, and then unwind our frame and run the user
entry point on the same stack we entered on. */
return _dl_sysdep_start (arg, &dl_main);
}
/* Now life is peachy; we can do all normal operations.
On to the real work. */
void _start (void);
/* Some helper functions. */
/* Arguments to relocate_doit. */
struct relocate_args
{
struct link_map *l;
int lazy;
};
struct map_args
{
/* Argument to map_doit. */
char *str;
/* Return value of map_doit. */
struct link_map *main_map;
};
/* Arguments to version_check_doit. */
struct version_check_args
{
struct link_map *main_map;
int doexit;
};
static void
relocate_doit (void *a)
{
struct relocate_args *args = (struct relocate_args *) a;
_dl_relocate_object (args->l, _dl_object_relocation_scope (args->l),
args->lazy);
}
static void
map_doit (void *a)
{
struct map_args *args = (struct map_args *)a;
args->main_map = _dl_map_object (NULL, args->str, lt_library, 0);
}
static void
version_check_doit (void *a)
{
struct version_check_args *args = (struct version_check_args *)a;
if (_dl_check_all_versions (args->main_map, 1) && args->doexit)
/* We cannot start the application. Abort now. */
_exit (1);
}
static inline struct link_map *
find_needed (const char *name)
{
unsigned int n;
for (n = 0; n < _dl_loaded->l_nsearchlist; ++n)
if (_dl_name_match_p (name, _dl_loaded->l_searchlist[n]))
return _dl_loaded->l_searchlist[n];
/* Should never happen. */
return NULL;
}
static int
match_version (const char *string, struct link_map *map)
{
const char *strtab = (const char *) (map->l_addr
+ map->l_info[DT_STRTAB]->d_un.d_ptr);
ElfW(Verdef) *def;
#define VERDEFTAG (DT_NUM + DT_PROCNUM + DT_VERSIONTAGIDX (DT_VERDEF))
if (map->l_info[VERDEFTAG] == NULL)
/* The file has no symbol versioning. */
return 0;
def = (ElfW(Verdef) *) ((char *) map->l_addr
+ map->l_info[VERDEFTAG]->d_un.d_ptr);
while (1)
{
ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux);
/* Compare the version strings. */
if (strcmp (string, strtab + aux->vda_name) == 0)
/* Bingo! */
return 1;
/* If no more definitions we failed to find what we want. */
if (def->vd_next == 0)
break;
/* Next definition. */
def = (ElfW(Verdef) *) ((char *) def + def->vd_next);
}
return 0;
}
unsigned int _dl_skip_args; /* Nonzero if we were run directly. */
static void
dl_main (const ElfW(Phdr) *phdr,
ElfW(Half) phent,
ElfW(Addr) *user_entry)
{
const ElfW(Phdr) *ph;
struct link_map *main_map;
int lazy;
enum { normal, list, verify, trace } mode;
struct link_map **preloads;
unsigned int npreloads;
const char *preloadlist;
size_t file_size;
char *file;
int has_interp = 0;
mode = getenv ("LD_TRACE_LOADED_OBJECTS") != NULL ? trace : normal;
_dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1;
/* LAZY is determined by the environment variable LD_WARN and
LD_BIND_NOW if we trace the binary. */
if (mode == trace)
lazy = (_dl_verbose
? (*(getenv ("LD_BIND_NOW") ?: "") == '\0' ? 1 : 0) : -1);
else
lazy = !__libc_enable_secure && *(getenv ("LD_BIND_NOW") ?: "") == '\0';
/* Set up a flag which tells we are just starting. */
_dl_starting_up = 1;
if (*user_entry == (ElfW(Addr)) &_start)
{
/* Ho ho. We are not the program interpreter! We are the program
itself! This means someone ran ld.so as a command. Well, that
might be convenient to do sometimes. We support it by
interpreting the args like this:
ld.so PROGRAM ARGS...
The first argument is the name of a file containing an ELF
executable we will load and run with the following arguments.
To simplify life here, PROGRAM is searched for using the
normal rules for shared objects, rather than $PATH or anything
like that. We just load it and use its entry point; we don't
pay attention to its PT_INTERP command (we are the interpreter
ourselves). This is an easy way to test a new ld.so before
installing it. */
if (_dl_argc < 2)
_dl_sysdep_fatal ("\
Usage: ld.so [--list|--verify] EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\
You have invoked `ld.so', the helper program for shared library executables.\n\
This program usually lives in the file `/lib/ld.so', and special directives\n\
in executable files using ELF shared libraries tell the system's program\n\
loader to load the helper program from this file. This helper program loads\n\
the shared libraries needed by the program executable, prepares the program\n\
to run, and runs it. You may invoke this helper program directly from the\n\
command line to load and run an ELF executable file; this is like executing\n\
that file itself, but always uses this helper program from the file you\n\
specified, instead of the helper program file specified in the executable\n\
file you run. This is mostly of use for maintainers to test new versions\n\
of this helper program; chances are you did not intend to run this program.\n",
NULL);
/* Note the place where the dynamic linker actually came from. */
_dl_rtld_map.l_name = _dl_argv[0];
while (_dl_argc > 1)
if (! strcmp (_dl_argv[1], "--list"))
{
mode = list;
lazy = -1; /* This means do no dependency analysis. */
++_dl_skip_args;
--_dl_argc;
++_dl_argv;
}
else if (! strcmp (_dl_argv[1], "--verify"))
{
mode = verify;
++_dl_skip_args;
--_dl_argc;
++_dl_argv;
}
else
break;
++_dl_skip_args;
--_dl_argc;
++_dl_argv;
if (mode == verify)
{
char *err_str = NULL;
const char *obj_name __attribute__ ((unused));
struct map_args args;
args.str = _dl_argv[0];
(void) _dl_catch_error (&err_str, &obj_name, map_doit, &args);
main_map = args.main_map;
if (err_str != NULL)
{
free (err_str);
_exit (EXIT_FAILURE);
}
}
else
main_map = _dl_map_object (NULL, _dl_argv[0], lt_library, 0);
phdr = main_map->l_phdr;
phent = main_map->l_phnum;
main_map->l_name = (char *) "";
*user_entry = main_map->l_entry;
}
else
{
/* Create a link_map for the executable itself.
This will be what dlopen on "" returns. */
main_map = _dl_new_object ((char *) "", "", lt_executable);
if (main_map == NULL)
_dl_sysdep_fatal ("cannot allocate memory for link map\n", NULL);
main_map->l_phdr = phdr;
main_map->l_phnum = phent;
main_map->l_entry = *user_entry;
main_map->l_opencount = 1;
}
/* Scan the program header table for the dynamic section. */
for (ph = phdr; ph < &phdr[phent]; ++ph)
switch (ph->p_type)
{
case PT_DYNAMIC:
/* This tells us where to find the dynamic section,
which tells us everything we need to do. */
main_map->l_ld = (void *) main_map->l_addr + ph->p_vaddr;
break;
case PT_INTERP:
/* This "interpreter segment" was used by the program loader to
find the program interpreter, which is this program itself, the
dynamic linker. We note what name finds us, so that a future
dlopen call or DT_NEEDED entry, for something that wants to link
against the dynamic linker as a shared library, will know that
the shared object is already loaded. */
_dl_rtld_libname.name = (const char *) main_map->l_addr + ph->p_vaddr;
_dl_rtld_libname.next = NULL;
_dl_rtld_map.l_libname = &_dl_rtld_libname;
has_interp = 1;
break;
}
if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name)
{
/* We were invoked directly, so the program might not have a
PT_INTERP. */
_dl_rtld_libname.name = _dl_rtld_map.l_name;
_dl_rtld_libname.next = NULL;
_dl_rtld_map.l_libname = &_dl_rtld_libname;
}
else
assert (_dl_rtld_map.l_libname); /* How else did we get here? */
if (mode == verify)
/* We were called just to verify that this is a dynamic executable
using us as the program interpreter. */
_exit (main_map->l_ld == NULL ? 1 : has_interp ? 0 : 2);
/* Extract the contents of the dynamic section for easy access. */
elf_get_dynamic_info (main_map->l_ld, main_map->l_info);
if (main_map->l_info[DT_HASH])
/* Set up our cache of pointers into the hash table. */
_dl_setup_hash (main_map);
/* Put the link_map for ourselves on the chain so it can be found by
name. Note that at this point the global chain of link maps contains
exactly one element, which is pointed to by main_map. */
if (! _dl_rtld_map.l_name)
/* If not invoked directly, the dynamic linker shared object file was
found by the PT_INTERP name. */
_dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname->name;
_dl_rtld_map.l_type = lt_library;
main_map->l_next = &_dl_rtld_map;
_dl_rtld_map.l_prev = main_map;
/* We have two ways to specify objects to preload: via environment
variable and via the file /etc/ld.so.preload. The later can also
be used when security is enabled. */
preloads = NULL;
npreloads = 0;
preloadlist = getenv ("LD_PRELOAD");
if (preloadlist)
{
/* The LD_PRELOAD environment variable gives a white space
separated list of libraries that are loaded before the
executable's dependencies and prepended to the global scope
list. If the binary is running setuid all elements
containing a '/' are ignored since it is insecure. */
char *list = strdupa (preloadlist);
char *p;
while ((p = strsep (&list, " ")) != NULL)
if (! __libc_enable_secure || strchr (p, '/') == NULL)
{
(void) _dl_map_object (NULL, p, lt_library, 0);
++npreloads;
}
}
/* Read the contents of the file. */
file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size,
PROT_READ | PROT_WRITE);
if (file)
{
/* Parse the file. It contains names of libraries to be loaded,
separated by white spaces or `:'. It may also contain
comments introduced by `#'. */
char *problem;
char *runp;
size_t rest;
/* Eliminate comments. */
runp = file;
rest = file_size;
while (rest > 0)
{
char *comment = memchr (runp, '#', rest);
if (comment == NULL)
break;
rest -= comment - runp;
do
*comment = ' ';
while (--rest > 0 && *++comment != '\n');
}
/* We have one problematic case: if we have a name at the end of
the file without a trailing terminating characters, we cannot
place the \0. Handle the case separately. */
if (file[file_size - 1] != ' ' && file[file_size] != '\t'
&& file[file_size] != '\n')
{
problem = &file[file_size];
while (problem > file && problem[-1] != ' ' && problem[-1] != '\t'
&& problem[-1] != '\n')
--problem;
if (problem > file)
problem[-1] = '\0';
}
else
problem = NULL;
if (file != problem)
{
char *p;
runp = file;
while ((p = strsep (&runp, ": \t\n")) != NULL)
{
(void) _dl_map_object (NULL, p, lt_library, 0);
++npreloads;
}
}
if (problem != NULL)
{
char *p = strndupa (problem, file_size - (problem - file));
(void) _dl_map_object (NULL, p, lt_library, 0);
}
/* We don't need the file anymore. */
__munmap (file, file_size);
}
if (npreloads != 0)
{
/* Set up PRELOADS with a vector of the preloaded libraries. */
struct link_map *l;
unsigned int i;
preloads = __alloca (npreloads * sizeof preloads[0]);
l = _dl_rtld_map.l_next; /* End of the chain before preloads. */
i = 0;
do
{
preloads[i++] = l;
l = l->l_next;
} while (l);
assert (i == npreloads);
}
/* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD
specified some libraries to load, these are inserted before the actual
dependencies in the executable's searchlist for symbol resolution. */
_dl_map_object_deps (main_map, preloads, npreloads, mode == trace);
#ifndef MAP_ANON
/* We are done mapping things, so close the zero-fill descriptor. */
__close (_dl_zerofd);
_dl_zerofd = -1;
#endif
/* Remove _dl_rtld_map from the chain. */
_dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next;
if (_dl_rtld_map.l_next)
_dl_rtld_map.l_next->l_prev = _dl_rtld_map.l_prev;
if (_dl_rtld_map.l_opencount)
{
/* Some DT_NEEDED entry referred to the interpreter object itself, so
put it back in the list of visible objects. We insert it into the
chain in symbol search order because gdb uses the chain's order as
its symbol search order. */
unsigned int i = 1;
while (main_map->l_searchlist[i] != &_dl_rtld_map)
++i;
_dl_rtld_map.l_prev = main_map->l_searchlist[i - 1];
_dl_rtld_map.l_next = (i + 1 < main_map->l_nsearchlist ?
main_map->l_searchlist[i + 1] : NULL);
assert (_dl_rtld_map.l_prev->l_next == _dl_rtld_map.l_next);
_dl_rtld_map.l_prev->l_next = &_dl_rtld_map;
if (_dl_rtld_map.l_next)
{
assert (_dl_rtld_map.l_next->l_prev == _dl_rtld_map.l_prev);
_dl_rtld_map.l_next->l_prev = &_dl_rtld_map;
}
}
/* Now let us see whether all libraries are available in the
versions we need. */
{
struct version_check_args args;
args.doexit = mode == normal;
args.main_map = main_map;
_dl_receive_error (print_missing_version, version_check_doit, &args);
}
if (mode != normal)
{
/* We were run just to list the shared libraries. It is
important that we do this before real relocation, because the
functions we call below for output may no longer work properly
after relocation. */
int i;
if (! _dl_loaded->l_info[DT_NEEDED])
_dl_sysdep_message ("\t", "statically linked\n", NULL);
else
{
struct link_map *l;
for (l = _dl_loaded->l_next; l; l = l->l_next)
if (l->l_opencount == 0)
/* The library was not found. */
_dl_sysdep_message ("\t", l->l_libname->name, " => not found\n",
NULL);
else
{
char buf[20], *bp;
buf[sizeof buf - 1] = '\0';
bp = _itoa (l->l_addr, &buf[sizeof buf - 1], 16, 0);
while ((size_t) (&buf[sizeof buf - 1] - bp)
< sizeof l->l_addr * 2)
*--bp = '0';
_dl_sysdep_message ("\t", l->l_libname->name, " => ",
l->l_name, " (0x", bp, ")\n", NULL);
}
}
if (mode != trace)
for (i = 1; i < _dl_argc; ++i)
{
const ElfW(Sym) *ref = NULL;
ElfW(Addr) loadbase = _dl_lookup_symbol (_dl_argv[i], &ref,
&_dl_default_scope[2],
"argument",
ELF_MACHINE_RELOC_NOPLT);
char buf[20], *bp;
buf[sizeof buf - 1] = '\0';
bp = _itoa (ref->st_value, &buf[sizeof buf - 1], 16, 0);
while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2)
*--bp = '0';
_dl_sysdep_message (_dl_argv[i], " found at 0x", bp, NULL);
buf[sizeof buf - 1] = '\0';
bp = _itoa (loadbase, &buf[sizeof buf - 1], 16, 0);
while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2)
*--bp = '0';
_dl_sysdep_message (" in object at 0x", bp, "\n", NULL);
}
else
{
if (lazy >= 0)
{
/* We have to do symbol dependency testing. */
struct relocate_args args;
struct link_map *l;
args.lazy = lazy;
l = _dl_loaded;
while (l->l_next)
l = l->l_next;
do
{
if (l != &_dl_rtld_map && l->l_opencount > 0)
{
args.l = l;
_dl_receive_error (print_unresolved, relocate_doit,
&args);
*_dl_global_scope_end = NULL;
}
l = l->l_prev;
} while (l);
}
#define VERNEEDTAG (DT_NUM + DT_PROCNUM + DT_VERSIONTAGIDX (DT_VERNEED))
if (*(getenv ("LD_VERBOSE") ?: "") != '\0')
{
/* Print more information. This means here, print information
about the versions needed. */
int first = 1;
struct link_map *map = _dl_loaded;
for (map = _dl_loaded; map != NULL; map = map->l_next)
{
const char *strtab =
(const char *) (map->l_addr
+ map->l_info[DT_STRTAB]->d_un.d_ptr);
ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG];
if (dyn != NULL)
{
ElfW(Verneed) *ent =
(ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr);
if (first)
{
_dl_sysdep_message ("\n\tVersion information:\n",
NULL);
first = 0;
}
_dl_sysdep_message ("\t", (map->l_name[0]
? map->l_name
: _dl_argv[0]), ":\n",
NULL);
while (1)
{
ElfW(Vernaux) *aux;
struct link_map *needed;
needed = find_needed (strtab + ent->vn_file);
aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux);
while (1)
{
const char *fname = NULL;
_dl_sysdep_message ("\t\t",
strtab + ent->vn_file,
" (", strtab + aux->vna_name,
") ",
(aux->vna_flags
& VER_FLG_WEAK
? "[WEAK] " : ""),
"=> ", NULL);
if (needed != NULL
&& match_version (strtab + aux->vna_name,
needed))
fname = needed->l_name;
_dl_sysdep_message (fname ?: "not found", "\n",
NULL);
if (aux->vna_next == 0)
/* No more symbols. */
break;
/* Next symbol. */
aux = (ElfW(Vernaux) *) ((char *) aux
+ aux->vna_next);
}
if (ent->vn_next == 0)
/* No more dependencies. */
break;
/* Next dependency. */
ent = (ElfW(Verneed) *) ((char *) ent
+ ent->vn_next);
}
}
}
}
}
_exit (0);
}
{
/* Now we have all the objects loaded. Relocate them all except for
the dynamic linker itself. We do this in reverse order so that copy
relocs of earlier objects overwrite the data written by later
objects. We do not re-relocate the dynamic linker itself in this
loop because that could result in the GOT entries for functions we
call being changed, and that would break us. It is safe to relocate
the dynamic linker out of order because it has no copy relocs (we
know that because it is self-contained). */
struct link_map *l;
l = _dl_loaded;
while (l->l_next)
l = l->l_next;
do
{
if (l != &_dl_rtld_map)
{
_dl_relocate_object (l, _dl_object_relocation_scope (l), lazy);
*_dl_global_scope_end = NULL;
}
l = l->l_prev;
} while (l);
/* Do any necessary cleanups for the startup OS interface code.
We do these now so that no calls are made after rtld re-relocation
which might be resolved to different functions than we expect.
We cannot do this before relocating the other objects because
_dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */
_dl_sysdep_start_cleanup ();
if (_dl_rtld_map.l_opencount > 0)
/* There was an explicit ref to the dynamic linker as a shared lib.
Re-relocate ourselves with user-controlled symbol definitions. */
_dl_relocate_object (&_dl_rtld_map, &_dl_default_scope[2], 0);
}
{
/* Initialize _r_debug. */
struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr);
struct link_map *l;
l = _dl_loaded;
#ifdef ELF_MACHINE_DEBUG_SETUP
/* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */
ELF_MACHINE_DEBUG_SETUP (l, r);
ELF_MACHINE_DEBUG_SETUP (&_dl_rtld_map, r);
#else
if (l->l_info[DT_DEBUG])
/* There is a DT_DEBUG entry in the dynamic section. Fill it in
with the run-time address of the r_debug structure */
l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
/* Fill in the pointer in the dynamic linker's own dynamic section, in
case you run gdb on the dynamic linker directly. */
if (_dl_rtld_map.l_info[DT_DEBUG])
_dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
#endif
/* Notify the debugger that all objects are now mapped in. */
r->r_state = RT_ADD;
_dl_debug_state ();
}
/* Once we return, _dl_sysdep_start will invoke
the DT_INIT functions and then *USER_ENTRY. */
}
/* This is a little helper function for resolving symbols while
tracing the binary. */
static void
print_unresolved (int errcode __attribute__ ((unused)), const char *objname,
const char *errstring)
{
_dl_sysdep_error (errstring, " (", objname, ")\n", NULL);
}
/* This is a little helper function for resolving symbols while
tracing the binary. */
static void
print_missing_version (int errcode __attribute__ ((unused)),
const char *objname, const char *errstring)
{
_dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>", ": ",
objname, ": ", errstring, "\n", NULL);
}