_dl_iterate_phdr_locked(): fix libc and libdl

Add prototype. Export from libdl.

Fixes: 1426fd6cff0603f0ee275b99f2ba35dc36f3d0c2
Reviewed by: kevans
Sponsored by: The FreeBSD Foundation
Differentia

_dl_iterate_phdr_locked(): fix libc and libdl

Add prototype. Export from libdl.

Fixes: 1426fd6cff0603f0ee275b99f2ba35dc36f3d0c2
Reviewed by: kevans
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D47563

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rtld: implement _dl_iterate_phdr_locked

Some sanitizers need to be able to use dl_iterate_phdr() after stopping
the rest of the process, but it's very hard to do so reliably as a
non-participant in

rtld: implement _dl_iterate_phdr_locked

Some sanitizers need to be able to use dl_iterate_phdr() after stopping
the rest of the process, but it's very hard to do so reliably as a
non-participant in the main logic of the program.

Introduce _dl_iterate_phdr_locked to bypass the locking that's normally
required for dl_iterate_phdr() and slap some scary warning on it. It
will remain undocumented and probably shouldn't be used for anything
else.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D47558

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rtld: add rtld_{get,set}_var

Reviewed by: brooks (previous version)
Discussed with: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D

rtld: add rtld_{get,set}_var

Reviewed by: brooks (previous version)
Discussed with: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D47351

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libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Kee

libc: Purge unneeded cdefs.h

These sys/cdefs.h are not needed. Purge them. They are mostly left-over
from the $FreeBSD$ removal. A few in libc are still required for macros
that cdefs.h defines. Keep those.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D42385

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Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

libc dlfcn.c: make dl_iterate_phdr() from libc more useful

Apparently there are applications that resolve dl_iterate_phdr from libc
and try to call the symbol. Our libc only provides stubs for dl* t

libc dlfcn.c: make dl_iterate_phdr() from libc more useful

Apparently there are applications that resolve dl_iterate_phdr from libc
and try to call the symbol. Our libc only provides stubs for dl* to
satisfy static linker or statically linked binaries, and is not prepared
to this situation.

Add a code to dso libc to find real dl_iterate_phdr and redirect the
call to it.

Reported by: yuri
PR: 272992
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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libc.a: implement _rtld_addr_phdr()

to make __cxa_thread_call_dtors() operational for statically linked
binaries.

Noted by: andrew
Reviewed by: emaste, dim
Sponsored by: The FreeBSD Foundation
MFC

libc.a: implement _rtld_addr_phdr()

to make __cxa_thread_call_dtors() operational for statically linked
binaries.

Noted by: andrew
Reviewed by: emaste, dim
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D40748

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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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libc dl_iterate_phdr(): dlpi_tls_data is wrong

This is the same change as d36d681615170590, but for libc static implementaion
of dl_iterate_phdr().

Reported by: emacsray@gmail.com
PR: 254774
Sponso

libc dl_iterate_phdr(): dlpi_tls_data is wrong

This is the same change as d36d681615170590, but for libc static implementaion
of dl_iterate_phdr().

Reported by: emacsray@gmail.com
PR: 254774
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D29623

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libc: include rtld.h into static implementations of rtld interface

and resolve naming conficts

Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.

libc: include rtld.h into static implementations of rtld interface

and resolve naming conficts

Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D29623

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libc: constify dummy error message string for dlfcn

Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D29623

libc: implement rtld_get_stack_prot() for real

which makes stack prot correct for non-main threads created by binaries
with statically linked libthr.

Cache result, but do not engage into the full d

libc: implement rtld_get_stack_prot() for real

which makes stack prot correct for non-main threads created by binaries
with statically linked libthr.

Cache result, but do not engage into the full double-checked locking,
since calculation of the return value is idempotent.

PR: 252549
Reported and reviewed by: emaste
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D28075

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MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

dl_iterate_phdr(3): provide exclusive locking for callback when statically linked.

Apparently llvm unwinder depends on the external locking for callback.

Reviewed by: cem, emaste
Tested by: emaste

dl_iterate_phdr(3): provide exclusive locking for callback when statically linked.

Apparently llvm unwinder depends on the external locking for callback.

Reviewed by: cem, emaste
Tested by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D26109

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libc: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
p

libc: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified 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.

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MFhead@r320180

Merge ^/head r319973 through 321382.

Merge ^/head r320573 through r320970.

Provide libdl.

Create libdl.so.1 as a filter for libc.so.7 which exports public dl*
functions. The functions are resolved from the rtld instead, the goal
of creating library is to avoid errors from

Provide libdl.

Create libdl.so.1 as a filter for libc.so.7 which exports public dl*
functions. The functions are resolved from the rtld instead, the goal
of creating library is to avoid errors from the static linker due to
missed libdl. For static binaries, an empty .o is compiled into
libdl.a so that static binaries still get dl stubs from libc.a.

Right now lld cannot create filter objects, disable libdl on arm64
when binutils are not used.

Reviewed by: bdrewery, dim (previos version); emaste
Exp run: PR 220525, done by antoine
Sponsored by: The FreeBSD Foundation
MFC after: 1 month
Differential revision: https://reviews.freebsd.org/D11504

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Fix warnings, adjust style.

Reviewed by: bdrewery, dim, emaste (as part of D11504)
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Merge from head

Sponsored by: Gandi.net

Merge from head

Merge from head

Sync up with head (up to r288341).

Merge ^/head r287878 through r288034.