The place where the function is called can be reached if object loading
and relocation fails too, in which case obj pointer will be NULL. Do not
call process_nodelete then, or crash will follow.

Pointy hat to: kan
Approved by: re (kib)

fully loaded.

Trying to up the reference from the load loop risks missing
dependencies that have not been loaded yet.

Approved by: re (kib)

Ensure that for the object which is a dependency for some filtee,
relocations are performed before the object's initializer is called.

Approved by:	re (kensmith)

Add thread-local storage support for ARM to rtld-elf

Reviewed by:    cognet
Obtained from:  NetBSD

Split the symlook_obj1 into a loop iterating over the ELF object symbol
hash elements, and a helper matched_symbol() which match the given hash
entry and request, performing needed type and version checks.

MFC r234841:
Add GNU hash support for rtld.

MFC r235054:
Work around a situation where symlook_obj() could be called for the
object for which digest_dynamic1() was not done yet. Just return
EINVAL and do not try to dereference NULL buckets hash array.

Propagate the current state of rtld_bind_lock to dlopen_object() calls
through the filter loading call chain. This fixes attempts to
write-lock the already locked rtld_bind_lock when filter loading is
initiated by relocation of dlopening dso.

Properly handle absent AT_CANARY aux entry.

Remove libssp_nonshared from the rtld linking set. The only use for the
library was definition for the weak alias of __stack_chk_fail.

Provide short-circuit exit(3) implementation for rtld.

Use xmalloc() instead of malloc() in the places where malloc() calls
are assumed to not fail.

Make the xcalloc() calling conventions follow the calloc(3) calling
conventions and replace unchecked calls to calloc() with calls to
xcalloc().

Remove redundand declarations from xmalloc.c, which are already
present in rtld.h.