initfini array support for everyone.

branches: 1.1.14; 1.1.16;
New files for Userland support of UCB RISC-V (both 32-bit and 64-bit)

Fix the build.

ld.elf_so: Cite reference for RISC-V ELF relocations.

PR lib/58455: Missing references for processor-specific ELF
relocation semantics

branches: 1.9.2;
Fix interactions of initial-exec TLS model and dlopen

(1) If an initial-exec relocation was used for a non-local symbol
(i.e. the definition of the symbol is in a different DSO), the
computation of the static TLS offset used the wrong DSO.
This would effectively mean the wrong address was computed
(PR toolchain/50277, PR pkg/57445).

Fix this by forcing the computation of the correct DSO (the one defining
the symbol).

This code uses __UNCONST to avoid the vast interface changes for this
special case.

(2) If symbols from a DSO loaded via dlopen are used with both
global-dynamic/local-dynamic and initial-exec relocations AND
a initial-exec relocation was resolved first in a thread, a split brain
situation could exist where the dynamic relocations would use one memory
block (separate allocation) and the initial-exec relocations the static
per-thread TLS space.

(3) If the initial-exec relocation in (2) is seen after any thread has
already used a GD/LD allocation, bail out. Since IE relocations are used
only in the GOT, this will prevent the dlopen. This is a bit more
aggressive than necessary, but a full blown reference counting doesn't
seem to be justified.

RISC-V support that works on QEMU with a single hart.

Thanks for Simon Burge for plic(4).

branches: 1.7.2;
RISC-V is RELA

Trailing whitespace

branches: 1.5.2;
r_symndx is no longer declared, use symnum and initialize it before use.

Completes the changes in the commit:
"Replace COMBREL with just-in-time check in _rtld_relocate_nonplt_objects."
http://mail-index.netbsd.org/source-changes/2017/06/19/msg085496.html

branches: 1.4.4;
Add IRELATIVE support for ARM, X86 and PowerPC.

Replace COMBREL with just-in-time check in _rtld_relocate_nonplt_objects.

The COMBREL logic predates thread-safety of the dynamic linker and
breaks the use of shared locks for the common symbol lookup case. It is
unlikely to provide any benefit for lazy binding or PLT lookups, so
provide equivalent functionality in the non-PLT relocation handling loop
by checking if the symbol used by the current relocation is the same as
the one used during the last lookup. No inter-object cachine is done as
it is also unlikely to be benefical.

Testing with Firefox startup on AMD64 shows a small performance gain by
the new method.

branches: 1.2.8;
Update RISCV to use the ELF relocations and new ABI.

New files for Userland support of UCB RISC-V (both 32-bit and 64-bit)

RISC-V support that works on QEMU with a single hart.

Thanks for Simon Burge for plic(4).

Use the SZREG symbol instead of __SIZEOF_POINTER__ as its shorter. Assert
that they're the same just in case.

Sprinkle some KNF whitespace while I'm here.

Consistently use the 'mv' instrucation (which is itself an alias) instead
of the (old) alternative alias 'move'.

Trailing whitespace

Update RISCV to use the ELF relocations and new ABI.

New files for Userland support of UCB RISC-V (both 32-bit and 64-bit)