Initial checkin for ld.so. This is a combination of effort from Manuel Novoa

III and me.  I've been working on stripping out arch dependant stuff and
replacing it with generic stuff whenever possible.
 -Erik

58 files changed, 13958 insertions, 0 deletions

diff --git a/ldso/COPYRIGHT b/ldso/COPYRIGHT
new file mode 100644
index 000000000..fb34248ec
--- /dev/null
+++ b/ldso/COPYRIGHT
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald, David Engel,
+ * Hongjiu Lu and Mitch D'Souza
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. The name of the above contributors may not be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* Notice of general intent:
+ *
+ * The linux operating system generally contains large amounts of code
+ * that fall under the GNU General Public License, or GPL for short.
+ * This file contains source code that by it's very nature would always
+ * be linked with an application program, and because of this a GPL
+ * type of copyright on this file would place restrictions upon the
+ * distribution of binary-only commercial software.  Since the goal of
+ * the Linux project as a whole is not to discourage the development and
+ * distribution of commercial software for Linux, this file has been
+ * placed under a more relaxed BSD-style of copyright.
+ *
+ * It is the general understanding of the above contributors that a
+ * program executable linked to a library containing code that falls
+ * under the GPL or GLPL style of license is not subject to the terms of
+ * the GPL or GLPL license if the program executable(s) that are supplied
+ * are linked to a shared library form of the GPL or GLPL library, and as
+ * long as the form of the shared library is such that it is possible for
+ * the end user to modify and rebuild the library and use it in
+ * conjunction with the program executable.
+ */
diff --git a/ldso/Makefile b/ldso/Makefile
new file mode 100644
index 000000000..23626f5e3
--- /dev/null
+++ b/ldso/Makefile
@@ -0,0 +1,13 @@
+include Config.mk
+
+SUBDIRS = util d-link # man
+
+all:
+	set -e ; for d in $(SUBDIRS) ; do $(MAKE) -C $$d ; done
+
+install: all
+	sh instldso.sh
+
+clean:
+	set -e ; for d in $(SUBDIRS) ; do $(MAKE) -C $$d $@ ; done
+	-find . -name '*~' | xargs rm -f
diff --git a/ldso/README b/ldso/README
new file mode 100644
index 000000000..025694ee3
--- /dev/null
+++ b/ldso/README
@@ -0,0 +1,860 @@
+
+Apr 20, 2001 -- Manuel Novoa III
+
+Inital port for uClibc from debian ld.so_1.9.11-9.tar.gz.
+
+Removed a.out support.
+
+"make" generates the ld-linux-uclibc.so.1, libdl.so.1, ldd, ldconfig
+       suitable for the target platform.
+
+"make DEVEL=true" generates the same files, but ld-linux-uclibc.so.1 and
+       ldconfig are modified to not conflict with the devel platform system
+       libs.  (This is only of use if TARGET_ARCH == NATIVE_ARCH.)  These
+       modified versions ignore /lib and /usr/lib and look for shared libs
+       only in $(INSTALL_DIR)/lib.  The modified ldconfig writes ld.so.cache
+       in $(INSTALL_DIR)/etc.
+
+The above assumes you've set the DYNAMIC_LINKER to /lib/ld-linux-uclibc.so.1
+in extra/gcc-uClibc/Makefile.
+
+Todo:
+
+Remove unneeded code in util/ldd.c.
+Link against static uClibc instead of using custom routines. ???
+Lots more cleanup... especially the arch-dependent Makefiles.
+
+****************** original ld.so.lsm file **************************
+Begin3
+Title:          Linux shared, dynamic linker and utilities.
+Version:        1.9.11
+Entered-date:   01MAY99
+Description:    This package contains ld.so, ld-linux.so, ldconfig,
+		ldd and libdl.
+Keywords:       dynamic linker, shared library, ld.so, ld-linux.so,
+		ldconfig, ldd, libdl
+Author:         david@ods.com (David Engel)
+Maintained-by:  david@ods.com (David Engel)
+Primary-site:   tsx-11.mit.edu /pub/linux/packages/GCC
+		ld.so-1.9.11.tar.gz
+Alternate-site: sunsite.unc.edu /pub/Linux/GCC
+		ld.so-1.9.11.tar.gz
+Platform:       Linux 2.0.0 or later.
+Copying-policy: Copyrighted but freely distributable.
+End
+*********************************************************************
+                   Original README starts here
+*********************************************************************
+
+This package contains my ELF dynamic linkers (ld-linux.so.1), dynamic
+linker library (libdl.so.1) and utilities (ldconfig and ldd) for Linux.
+
+You need Linux kernel 2.0.0 or later with ELF support compiled in
+(i.e. not loaded as a module) to use this package.
+
+The dynamic linker is used to bootstrap programs and load shared
+libraries at startup.  The dynamic linker library is used to
+dynamically load shared libraries after a program is running.
+Ldconfig is used to automatically update the symbolic links to shared
+libraries and build the cache file used by the dynamic linker.  Ldd is
+used to list the shared libraries used by a program.
+
+Please see the included manual pages for further details.
+
+To install, simply run "sh instldso.sh" as root.  Ready-to-go versions
+of all end-products are provided so nothing should need to be compiled
+or linked.  If you are still using libc5 as your primary development
+library, you should use the "--devfiles" option when running
+instldso.sh to install the file needed to compile with libdl.
+
+ELF versions of gcc, binutils and libc are now required to compile
+everything, including the old, unsupported, a.out dynamic linker.
+Finally, an optimization level of O2 or higher must be used to compile
+ld-linux.so and libdl.so due the use of inline functions.
+
+Notable contributors to this package include Eric Youngdale, Peter
+MacDonald, Hongjiu Lu, Linus Torvalds, Lars Wirzenius, Mitch D'Souza,
+Rik Faith, Andreas Schwab and Adam Richter (not necessarily in that
+order).
+
+###################### IMPORTANT NOTICES #############################
+
+A.OUT SUPPORT:
+
+As of ld.so-1.9.0, the old, a.out dynamic loader is no longer 
+officially supported.  The code is still included and built, but I 
+make no promises that it will work.  I will accept patches for it, 
+but they will not be tested by me.
+
+GLIBC (AKA LIBC6) SUPPORT:
+
+As of ld.so-1.9.0, the main focus of this package is to ease the
+transition to libc6.  No significant, new features are expected to be
+added.  If you need new features, switch to libc6.
+
+Except for libpthread.so, the sonames of the core libraries provided
+with libc6 have been chosen so they do not conflict with those
+provided by libc5 and ld.so.  However, the current plan is not use
+new, nonconflicting sonames for other libraries such as ncurses and
+X11.  This presents two problems.  First, libraries using the same
+soname for both libc5 and libc6 can not be placed in the same
+directory.  Second, the dynamic linkers need to make sure not to load
+a library for the wrong version of libc.
+
+The first problem is easy.  Just move the old, libc5-based libraries
+to new directories (e.g. /lib/libc5-compat, /usr/lib/libc5-compat,
+etc.) and add those directories to /etc/ld.so.conf.  Then install the
+new, libc6-based versions in the standard places.
+
+The second problem is more difficult.  Ideally, the dynamic linkers
+would be changed to perform a complete dependency analysis on every
+library to be loaded to make sure the wrong versions aren't used.
+This approach doesn't seem worth the added complexity, especially
+since we now have symbol versioning for ELF libraries.  Instead a
+simpler approach will be used, at least initially.
+
+Ldconfig has been modified to perform a (currently simple) dependency
+analysis on libraries and to store an indication in /etc/ld.so.cache
+of whether a library is for libc5, libc6 or an unknown libc.  The
+dynamic linkers then only need to make a simple check at run-time to
+make sure they don't load the wrong version of a library.
+
+The dynamic linker for libc5 provided in this package, has already
+been modified to use the new information in /etc/ld.so.cache.  For
+glibc versions 2.0.1 and earlier, the dynamic linker for libc6 needs
+the patch contained in glibc.patch.  You should apply the patch and
+rebuild glibc before using the new ldconfig.
+
+As stated above, the dependency analysis currently done by ldconfig is
+rather simple.  Basically, it looks for the sonames used by the
+various versions of libc, libm and libdl.  For any approach using a
+dependency analysis such as this to work, it is very important that
+shared libraries be built with complete dependency information.  This
+can be done by using the appropriate -l options when running 'gcc
+-shared'.  For example, when building libfoo.so which depends on libc
+and libbar, you should add -lbar and -lc gcc command line.
+
+######################################################################
+
+Changes in version 1.9.11:
+
+	Fixed a bug in ld-linux.so where a reference to an
+	undefined symbol could cause a segfault.
+
+	Added a clarification for LD_PRELOAD to the ld.so manual 
+	page and added a symlink for ld-linux.so (Bug#33123).
+
+	Don't install ldd for Debian except for the m68k arch
+	because glibc 2.1 now includes it (Bug#35458).
+
+Changes in version 1.9.10:
+
+	Changed ldconfig to issue a warning and not overwrite a
+	regular file with a symlink (Bug#30859).
+
+	Changed Debian packaging to conflict with and replace the
+	ldconfig package (Bug#29398).
+
+Changes in version 1.9.9:
+
+	Changed ld-linux.so and libdl.so to match glibc by not
+	allowing user preloads of system libraries into setu/gid
+	binaries unless the library itself is setuid.
+
+	Fixed problems in ld-linux.so on the sparc architecture
+	(Juan Cespedes).
+
+Changes in version 1.9.8:
+
+	Changed ldconfig to allow the expected type for all
+	libraries in a directory to be optionally specified
+	(Mark Phillips).  See the ldconfig man page.
+
+	Changed ldconfig to use the same type names used in the
+	change above when the -p option is used.
+
+Changes in version 1.9.7:
+
+	Changed ldd for m68k to use /lib/ld.so.1 instead of 
+	/lib/ld-linux.so.2.
+
+	Added support for dladdr to libdl.so (Eduard Gode).
+
+	Fixed a small memory leak in libdl.so (Richard Garnish).
+
+	Fixed a bug in ldconfig when the -l option was used on a
+	filename without a '/' in it.
+
+	Updated the man pages (Bug#6404, Bug#9721, Bug#10652, 
+	Bug#13494 and Bug#14127).  They could still use some work.
+
+	No longer install the info page since it's way out of date.
+
+	Fixed minor Debian packaging problems (Bug#13160, 
+	Bug#15577 and Bug#19345).
+
+Changes in version 1.9.6:
+
+	Changed ldd to not use the glibc dynamic linker when run
+	on a libc5-based shared library.
+
+	Added a -q option to ldconfig which causes warnings not
+	to be printed (Bob Tinsley).
+
+	Dropped support for the Debian libdl1-dev package.
+
+	Changed ld-linux.so to be compilable with gcc 2.8.0 (Sven 
+	Verdoolaege)
+
+Changes in version 1.9.5:
+
+	Fixed a bug in ldd where ld-linux.so.2 was not called
+	correctly when run on shared libraries.
+
+	Fixed a problem in the previous version where some
+	Makefiles were not architecture independent.
+
+Changes in version 1.9.4:
+
+	Fixed a bug in ld.so introduced in the previous version
+	which broke preloads.
+
+	Turned a.out support back on by default, at least for the
+	time being.  There are no promises to keep it.
+
+Changes in version 1.9.3:
+
+	Fixed buffer overflow bugs in ld-linux.so and ld.so.
+
+	Changed the README file a little to clarify a couple of
+	things.
+
+	Changed ldconfig to chroot to the specified directory when
+	the new -r option is used (Bob Tinsley).
+
+Changes in version 1.9.2:
+
+	Removed /usr/local/lib from the default /etc/ld.so.conf
+	for Debian (Bug#8181).
+
+	Changed ldconfig to be 64-bit clean (H.J. Lu).
+
+Changes in version 1.9.1:
+
+	Changed ldconfig to try to determine which libc a
+	library is for even if it doesn't have an soname.
+
+	Fixed a bug in ldconfig where an older library using
+	the glibc naming convention would be used instead of
+	a newer library.
+
+	Changed to ld-linux.so and libdl.so to not require the 
+	libc5 headers in order to compile.
+
+	Changed ldconfig and ldd to be compilable with either
+	libc5 or libc6.
+
+Changes in version 1.9.0:
+
+	Changed to not build the old, a.out dynamic loader by
+	default.
+
+	Changed instldso.sh to require the --force option to
+	make sure users read the README file.
+
+	Changed instldso.sh to not install the libdl.so
+	development files unless the --devfiles option is used.
+
+	Changed instldso.sh to not strip binaries and libraries
+	if the --no-strip option is used.
+
+	Changed the Debian packaging to put the development files 
+	which conflict with glibc in a new libdl1-dev package.
+
+	Changed ldd to use the glibc dynamic linker, if it is
+	available, when run on a shared library.
+
+	Changed ld-linux.so to print the load addresses of
+	libraries, ala glibc, when run by ldd.
+
+	Changed ld-linux.so to allow the libraries listed in 
+	LD_PRELOAD to be separated by white space in addition to 
+	colons.
+
+	Changed ld-linux.so to load the libraries listed in 
+	LD_PRELOAD for setu/gid programs as long as they can be 
+	loaded securely.
+
+	Changed ldconfig to update the symlinks for the dynamic
+	linkers.
+
+	Changed ldconfig to try to determine if an ELF library is
+	intended for libc5 or libc6 and save the infomation in the
+	cache.  The mechanism used is rather simplistic and may
+	need to be enhanced.
+
+	Changed ldconfig to print the type of ELF library when
+	printing the cache.
+
+	Changed ld-linux.so to only load ELF shared libraries for
+	use with libc5 or an unknown libc.
+
+Changes in version 1.8.10:
+
+	Fixed a bug in ldconfig where a symlink could be used
+	instead of a regular file.
+
+	Fixed a Debian packaging problem for the sparc 
+	architecture.
+
+Changes in version 1.8.9:
+
+	Changed ldconfig to only cache the symlinks it creates.
+	This make the behavior of the dynamic linkers consistent
+	with how they would behave if a cache was not used.
+
+	Changed ldconfig to cache the symlinks that it finds but
+	use the name of the symlink as the soname instead of the 
+	actual soname.
+
+Changes in version 1.8.8:
+
+	Minor documentation updates to reflect recent changes.
+
+	Changed ld.so and ld-linux.so to perform more complete
+	validation on ld.so.cache before using it.
+
+	Changed ldconfig to accept libraries with inconsistent
+	sonames since glibc is going to use them.  A warning is
+	still printed in debug mode.
+
+	Changed the install script to not strip _dl_debug_state
+	from ld-linux.so since gdb needs it.
+
+	More sparc fixes (Derrick Brashear).
+
+	Changed ldconfig to not issue a warning when a linker
+	script disguised as a shared library is found.
+
+	Fixed a bug in ld-linux.so where some registers were 
+	not preserved on the first call to a function causing 
+	problems for non-C-like languages (Tim Renouf).
+
+	Fixed a bug in ld-linux.so where global variables were 
+	not always mapped correctly across dynamically loaded 
+	libraries (Mikihiko Nakao).
+
+	Converted to new Debian source packaging format (Shaya
+	Potter).
+
+Changes in version 1.8.6/7:
+
+	Never released as some unofficial patches used these
+	version numbers.
+
+Changes in version 1.8.5:
+
+	Fixed a bug in ld.so introduced in the previous changes.
+
+Changes in version 1.8.4:
+
+	Changed ldconfig to completely ignore symbolic links.
+
+	Changed ldconfig to issue the warning concerning an
+	inconsistent soname in non-verbose mode.
+
+	Changed ld-linux.so back to not keep ld.so.cache mapped
+	at all times.
+
+	Changed Debian packaging to compress man pages, strip all
+	binaries (Bug#5125) and include a shlibs file.
+
+Changes in version 1.8.3:
+
+	Changed ld-linux.so to process LD_PRELOAD before
+	/etc/ld.so.preload.
+
+	Fixed a Debian packaging problem where libdl might not
+	be available if other packages were upgraded at the same
+	time (Debian Bug#4728).
+
+	Changed ldd to always exit with status 1 if any errors
+	occur (Debian Bug#4188).
+
+	Fixed some minor problems in instldso.sh (Mike Castle and
+	Wolfgang Franke).
+
+	Changed ldconfig to issue a warning in verbose mode when 
+	skipping a library because the soname doesn't match.
+
+	More sparc fixes (Miguel de Icaza).
+
+	Don't link with -N when building ld.so (Alan Modra).
+
+	Changed ld-linux.so to better support position-dependant
+	libraries (NIIBE Yutaka).
+
+Changes in version 1.8.2:
+
+	Added a texinfo file for ld.so and libdl (Michael 
+	Deutschmann).
+
+	Minor sparc and installation changes (Elliot Lee).
+
+	Added multiple architecture support for Debian (Leland
+	Lucius).
+
+	Changed libdl to better support RTLD_NEXT (Eric 
+	Youngdale).  Note: the exact meaning of ETLD_NEXT is 
+	still not clear in all cases.
+
+	Removed some libc dependencies from libdl.  Still need
+	to remove malloc and free.
+
+Changes in version 1.8.1:
+
+	Changed ld.so to be compiled as ELF.  This also means
+	that ELF support is now required.  A.out support is 
+	still optional.
+
+	Changed ld-linux.so and libdl.so to use the rpath in the 
+	executable instead of in the invoking shared library.
+
+	More m68k fixes (Andreas Schwab).
+
+	Various sparc fixes (Miguel de Icaza).
+
+	Changed ldcnnfig to ignore libraries ending in '~'.
+
+	Changed ldconfig to allow alternative conf and cache 
+	files to be specified on the command-line.
+
+	Changed libdl.so to work when dlsym is passed a NULL
+	handle pointer.
+
+Changes in version 1.8.0:
+
+	Changed ld-linux.so to be more liberal when checking to
+	see if a library is already loaded.  This should avoid
+	the duplicate loading problem for programs linkeed with
+	the -rpath option.
+
+	Various m68k fixes (Andreas Schwab).
+
+	Changed ld.so to only use LD_AOUT_LIBRARY_PATH and
+	LD_AOUT_PRELOAD and ld-linux.so to only use 
+	LD_LIBRARY_PATH and LD_PRELOAD.  LD_ELF_LIBRARY_PATH
+	and LD_ELF_PRELOAD are no longer supported.
+
+	Changed ld-linux.so to allow debugging of shared and
+	dynamically loaded libraries (H.J. Lu, Andreas Schwab).
+
+	Changed ld-linux.so to preload ELF shared libraries 
+	listed in /etc/ld.so.preload.  This allows secure 
+	preloads, even for setuid/setgid programs.
+
+	Changed ld-linux.so to keep ld.so.cache mapped at all
+	times.
+
+	Changed ldconfig to allow #-style comments in ld.so.conf.
+
+	Removed various compiler warnings (Richard Sladkey and
+	David Engel).
+
+	Changed ldd to work on ELF shared libraries.  This may
+	need a little more work.
+
+Changes in version 1.7.14:
+
+	Changed ldconfig to recognize ELF shared libraries
+	generated by post-2.6 versions of ld (Andreas Schwab).
+
+	Changed ldconfig to not remove stale links that do not
+	have a version number since they may be needed by ld.
+
+Changes in version 1.7.13:
+
+	Fixed a problem in ld-linux.so where a program linked
+	with a shared library that was not used could result in
+	a segmentation fault (H.J. Lu).
+
+Changes in version 1.7.12:
+
+	Fixed a problem in libdl.so where the wrong library
+	could be marked as global when RTLD_GLOBAL was used
+	(Lars Heete).
+
+	Installed dlfcn.h with libdl.so instead of requiring
+	it to be supplied with libc.
+
+	Removed support for libldso.a since it was nearly
+	impossible to use anyway.
+
+	Changed ldd to detect when the program being checked
+	exited abnormally.
+
+Changes in version 1.7.11:
+
+	Changed ld.so and ld-linux.so to delete all variations
+	of LD_PRELOAD and LD_LIBRARY_PATH for set[ug]id programs,
+	This makes it harder for broken set[ug]id programs to be
+	compromised.
+
+	Fixed a problem in libdl.so where dlsym would not accept
+	the handle returned from dlopen(0, *).
+
+Changes in version 1.7.10:
+
+	Changed ld-linux.so and libdl.so to support RTLD_GLOBAL
+	(Eric Youngdale).
+
+Changes in version 1.7.9:
+
+	Fixed a problem in ld-linux.so in detecting when the 
+	new user/group information is provided by the kernel.
+
+	Fixed a problem in ld-linux.so where a buffer could be
+	overflowed if a large number of libraries were loaded
+	(Thomas Moore).
+
+Changes in version 1.7.8:
+
+	Changed the Makefiles and install scripts to support 
+	a.out-