sys: Remove two double words in source code comments

- s/of of/of/

MFC after: 5 days

sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

link_elf.h: cleanup struct link_map definition, remove mips-specific field

Sponsored by: The FreeBSD Foundation

rtld: bump r_debug.r_version to 1 from current 0.

Add r_ldbase.

Requested and reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D27429

Implement Solaris-like link_map l_refname member.

The implementation is based on the public documentation, in particular
dlinfo(3) from Solaris.

Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Restore the binary compatibility for link_map l_addr.

Keep link_map l_addr binary layout compatible, rename l_addr to l_base
where rtld returns map base. Provide relocbase in newly added l_addr.

This effectively reverts the patch to the initial version of D24918.

Reported by: antoine (portmgr)
Reviewed by: jhb, markj
Tested by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D24946

Change the samantic of struct link_map l_addr member.

It previously returned the object map base address, while all other
ELF operating systems return load offset, i.e. the difference between
map base and the link base.

Explain the meaning of the field in the man page.

Stop filling the mips-only l_offs member, which is apparently unused.

PR: 246561
Requested by: Damjan Jovanovic <damjan.jov@gmail.com>
Reviewed by: emaste, jhb, cem (previous version)
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D24918

sys/sys: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Add rtld private interface for dso to detect dynamic loading
vs. static linking.

Tested by: pho, antoine (exp-run)
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Add dl_unwind_find_exidx() for ARM EABI, required for C++ exception
handling. For statically linked apps this uses the __exidx_start/end
symbols set up by the linker. For dynamically linked apps it finds the
shared object that contains the given address and returns the location and
size of the exidx section in that shared object.

The dl_unwind_find_exidx() name is used by other BSD projects and Android,
and is mentioned in clang 3.5 comments as "the BSD interface" for finding
exidx data. GCC (in libgcc_s) expects the exact same API and functionality
to be provided by a function named __gnu_Unwind_Find_exidx(), so we provide
that with an alias ("strong reference").

Reviewed by: kib@
MFC after: 1 week

In rtld, read the initial stack access mode from AT_STACKPROT as set
by kernel, and parse PT_GNU_STACK phdr from linked and loaded dsos.

If the loaded dso requires executable stack, as specified by PF_X bit
of p_flags of PT_GNU_STACK phdr, but current stack protection does not
permit execution, the __pthread_map_stacks_exec symbol is looked up
and called. It should be implemented in libc or threading library and
change the protection mode of all thread stacks to be executable.

Provide a private interface _rtld_get_stack_prot() to export the stack
access mode as calculated by rtld.

Reviewed by: kan

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Introduce implementation-private rtld interface _rtld_addr_phdr, which
fills struct dl_phdr_info for the shared object that contains the
specified address, if any.

Idea and reviewed by: kan
MFC after: 3 weeks

style(9)
Differences from 'svn diff -x -Bbw' are trivially verifiable as only style(9).

- Import the HEAD csup code which is the basis for the cvsmode work.

Revert r180431.
r180431 broke the AMD64 build (the only arch using kern/link_elf_obj.c)

Allow 'elf_file_t' to be used in a wider scope.

Add dl_iterate_phdr function prototype and corresponding dl_phdr_info
structure definition.

/* -> /*- for license, minor formatting changes

Implement dlinfo() function.

Introdice RTLD_SELF special handle and properly process it within
dlsym() and dlinfo() functions.

The intention is to improve our compatibility with Solaris and
to make a Java port easier.

Partially submitted by: phantom

Repo copy link.h to sys/link_elf.h and sys/link_aout.h since they are
shared with the kernel. This should make it easier to #include them both
at once as well as stop grabbing stuff from /usr/include.

Breath deep and take __P out of the system include files.

# This appears to not break X11, but I'm having problems compiling the
# glide part of the server with or without this patch, so I can't tell
# for sure.

style(9) the structure definitions.

Update the prototype for "r_brk" to correspond with the change in
"src/libexec/rtld-elf/rtld.c" revision 1.48. This eliminates a
warning when building the dynamic linker, and it doesn't seem to
hurt anything else.

$Id$ -> $FreeBSD$

Add GDB support for ELF shared libs.

Implement dladdr.

Move nlist related defines from link.h into nlist.h. Clean up
nlist.h.

Remove the prototypes for dlopen and related functions. They don't
belong here. The standard place for them is <dlfcn.h>, and there is
already another copy of the prototypes there.

const correctness for dl*()

Implement dlsym(RTLD_NEXT, symbol).

Back out all of yesterdays include file changes.

Make a lot of include-files self-contained. I excluded the patches changing
int's to gid_t and uid_t - should I commit these, too?

Closes PR misc/2625.

Submitted by: Julian Assange <proff@iq.org>

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Fixed the wrong include file for a "prototype mismatch" error between
dlfcn.h and link.h

dlfcn.h and link.h have conflicting declarations for dlopen/dlsym,
with dlfcn.h declaring them as:

void *dlopen __P((const char *, int));
void *dlsym __P((void *, const char *));

while link.h declared them as

extern void *dlopen __P((char *, int));
extern void *dlsym __P((void *, char *));

Fix link.h to match dlfcn.h

Add support for storing a -R path in ld in the section dispatch table,
support LD_HINTS_VERSION_2 that has the ldconfig pathname stored in the
ld.so.hints file (ie: a new library can be installed and used without
needing to run ldconfig -m first)

Reviewed by: nate, jdp
Obtained from: NetBSD (mostly)

Fix a bunch of spelling errors in the comment fields
of a bunch of system include files.

Change ld.so to correctly load dependant libraries for dlopen and unload them
on dlclose. Also correctly call constructors and destructors for libraries
linked with /usr/lib/c++rt0.o.
Change interpretation of dlopen manpage to call _init() rather than init()
for dlopened objects.
Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to
call destructors when an object is unloaded.
Change interface between crt0 and ld.so to allow crt0 to call a function on
exit to call destructors for shared libraries explicitly.

These changes are backwards compatible. Old binaries will work with the new
ld.so and new binaries will work with the old ld.so. A version number has
been introduced in the crt0-ld.so interface to allow for future changes.

Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>

Weak symbol support from NetBSD. This should bring us in sync with the
NetBSD ld code except for local changes for dlopen() and friends and
the hashing on the minor value of the shlibs. We should be binary
compatible now with all their libraries.

Obtained from: NetBSD

Support for more Sun compatible dlopen() and friends. Also added proper error
handling.
Reviewed by: gj
Submitted by: Mark Diekhans <markd@grizzly.com>

This is the new link.h from Paul K. Keeping history is even probably a bad
idea considering the old version (but I haven't time for attic surgery - this
is just a caution). This is part of (and the major reason for) the new ld
changes.

Added link.h for shared libs.