archdep.h needed for _dl_dcbf, on powerpc

Prep .c files for removing the #includes from */archdep.h
* replace #include "archdep.h" with #includes of what is used, pulling in
"syscall.h", "util.h", and "archdep.h" as needed
* delete #inc

Prep .c files for removing the #includes from */archdep.h
* replace #include "archdep.h" with #includes of what is used, pulling in
"syscall.h", "util.h", and "archdep.h" as needed
* delete #include <sys/syscall.h> from syscall.h
* only pull in <sys/stat.h> to the three files that use _dl_fstat(),
forward declare struct stat in syscall.h for the others
* NBBY is for <sys/select.h> macros; just use '8' in dl_printf.c
* <machine/vmparam.h> is only needed on i386; conditionalize it
* stop using __LDPGSZ: use _MAX_PAGE_SHIFT (already used by malloc.c)
where necessary
* delete other bogus #includes, order legit per style: <sys/*> then
<*/*>, then <*>, then "*"

dir.c improvement from jsg@
ok and testing assistance deraadt@

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Disable ltrace for objects linked with -znow, as at least on amd64, linking
that was deletes the lazy relocation trampoline which ltrace currently
depends on

problem reported by tb@
directional feed

Disable ltrace for objects linked with -znow, as at least on amd64, linking
that was deletes the lazy relocation trampoline which ltrace currently
depends on

problem reported by tb@
directional feedback kettenis@
ok mpi@

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Prefer the size-independent ELF identifiers over the size-specific ones.
Strip superfluous parens from return statements while here.

Done programatically with two perl invocations

idea ok kettenis@

Prefer the size-independent ELF identifiers over the size-specific ones.
Strip superfluous parens from return statements while here.

Done programatically with two perl invocations

idea ok kettenis@ drahn@
ok visa@

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Delete some obsolete debugging #ifdefs blocks

ok mlarkin@, mpi@, krw@, deraadt@

Factor out TEXTREL mprotecting from the per-arch files into _dl_rtld(),
hiding the actual grotty bits in inline functions

ok mpi@

Simplify _dl_find_symbol(). Currently, it returns three values:
- the symbol it found, returned via the second argument
- the base offset of the the object it was found in, via the return value
-

Simplify _dl_find_symbol(). Currently, it returns three values:
- the symbol it found, returned via the second argument
- the base offset of the the object it was found in, via the return value
- optionally: the object it was found in, returned via the last argument

Instead, return a struct with the symbol and object pointers and let the
caller get the base offset from the object's obj_base member. On at least
aarch64, amd64, mips64, powerpc, and sparc64, a two word struct like this
is passed in registers.

ok mpi@, kettenis@

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Finish ld.so's transition to GNU_RELRO: eliminate support for using
__got_{start,end} to find a region to mark read-only. It was only used
for binaries that didn't have a GNU_RELRO segment, but all

Finish ld.so's transition to GNU_RELRO: eliminate support for using
__got_{start,end} to find a region to mark read-only. It was only used
for binaries that didn't have a GNU_RELRO segment, but all archs have
been using that for over a year. Since support for insecure-PLT layouts
on powerpc and alpha have been removed, all archs handle GNU_RELRO the
same way and the support can be moved from the MD code to the MI code.

ok mpi@

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Delete support for obsolete BSS PLT format, which was last known to be
used by the dearly departed editors/emacs21 port.

Per naddy@, we'll keep an eye out for issues in the next ports bulk build

__plt_{start,end} are no longer generated or necessary, having been
superseded by the generic ?WX and RELRO support. Stop trying to look
up and use them.

ok kettenis@ deraadt@

For consistentcy, use 'void *' with %p instead of 'char *'

On fatal errors, kill ourselves with thrkill(0,9,NULL) instead of
simply exiting, via helper functions _dl_die(), _dl_diedie(), and
_dl_oom().

prompted by a complaint from jsing@
ok jsing@ deraadt@

Fix format string mismatches

When handling DT_TEXTREL only set the mapping to READ+WRITE, ignore
possible EXEC permission for the section, because the proper permission
is set late, and there are no thread concerns here. Avoids

When handling DT_TEXTREL only set the mapping to READ+WRITE, ignore
possible EXEC permission for the section, because the proper permission
is set late, and there are no thread concerns here. Avoids W^X issues
in oddball cases.
ok guenther kettenis

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Only need to sync the icache on the GOT for the old BSS PLT format

ok kettenis@

Export environ and __progname, making the latter a copy of just the filename
portion like crt0 does. This is prep for eliminating _dl_fixup_user_env()
Mark almost everything in resolve.h as hidden,

Export environ and __progname, making the latter a copy of just the filename
portion like crt0 does. This is prep for eliminating _dl_fixup_user_env()
Mark almost everything in resolve.h as hidden, to improve code generation.

ok kettenis@ mpi@ "good time" deraadt@

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Factor out the logic for mprotecting the memory between two symbols into
a new MI routine _dl_protect_segment(), and use that for protecting the
GOT and--on some archs--the PLT.

Amazing testing turn

Factor out the logic for mprotecting the memory between two symbols into
a new MI routine _dl_protect_segment(), and use that for protecting the
GOT and--on some archs--the PLT.

Amazing testing turnaround by miod@, who apparently violated relativity
to get back results on some archs as fast as he did

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Use kbind for lazy binding GOT/PLT updates on i386 and powerpc; still others
to follow. While here add some gcc __predict hints.

Much discussion with and assistance from miod and deraadt
ok deraadt@

Add support for the Secure-PLT ABI variant. This will give us better W^X
support on powerpc as it uses a non-executable GOT and PLT.

"start slamming stuff in" deraadt@

Make the scope of the symbol caching variables added in 1.49 a bit larger so
that these don't get reset for every relocation being processed (oops).
ok guenther@ deraadt@

Add more sugar to build syscall stubs, and turn them from inlines to real
entry points; also, make sure syscall failures return -errno rather than -1.

Appease LLVM warning..

error: indirection of non-volatile null pointer will be deleted, not trap [-Werror,-Wnull-dereference]

Suggestion from matthew@
Ok matthew@ miod@

Introduce ltrace(1). This tool works with ld.so to inject utrace record for
each plt call, allowing to trace a binary linked against shared library at the
public function call level.

To do so, ltrac

Introduce ltrace(1). This tool works with ld.so to inject utrace record for
each plt call, allowing to trace a binary linked against shared library at the
public function call level.

To do so, ltrace(1) sets up some environment variables to enable plt tracing
in ld.so, and invokes ktrace(2) for utrace events. ld.so will force lazy
binding and will send an utrace record in the plt resolver, without updating
the plt.

Minimal filtering capabilities are provided, inspired by Solaris' truss -u,
to limit tracing to libraries and/or symbol names. Non-traced libraries and
symbols will have the regular resolver processing, with the expected plt
update.

"Get it in" deraadt

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Implement symbol caching and RELACOUNT/RELCOUNT optimizations.
Much assistance and testing by miod

ok miod@

Avoid using NULL in non-pointer contexts: use 0 for integer values and '\0'
for chars.