NDS32/opcodes: Add audio ISA extension and modify the disassemble implemnt.

First, add nds32 audio ISA extension including opcodes and registers.
Second, redesign the disassemble implement.
The original disassemble decode instruction opcode using switch-case.
It is hard to synchronize when adding new instructions.
Therefore, the new implement reuses nds32_opcodes to dump the instructions.
NDS32: Code refactoring of relaxation.

Refactor each relaxation pattern to raise the maintainability.
In origin, all patterns is analysed in nds32_elf_relax_section,
so it is hard to debug and maintain.  Therefore, we classify all
patterns into different functions in this patch.
Moreover, we adjust all optimizations into nds32_elf_relax_section
to take these optimizations in turn.  This can promise all relaxation
being done after calling gld${EMULATION_NAME}_after_allocation.
Another board file for remote host

In the recent review to my patch about copying files to remote host,
we find that we need a board file which is more closely mapped real
remote host testing to improve coverage.  With the board file
local-remote-host-native.exp, DejaGNU copies files to
$build/gdb/testsuite/remote-host to emulate the effect of remote host.
Is it OK?

gdb/testsuite:

2014-09-16  Yao Qi  <yao@codesourcery.com>

	* boards/local-remote-host-native.exp: New file.
Remove support for testing against dead "target vxworks"

"target vxworks" and friends have been removed 10 years ago already:

 commit e84ecc995d6a5e4e9114d3cea61717b8a573afb6
 Author:     Andrew Cagney <cagney@redhat.com>
 AuthorDate: Sat Nov 13 23:10:02 2004 +0000

    2004-11-13  Andrew Cagney  <cagney@gnu.org>

        * configure.tgt: Delete i[34567]86-*-vxworks*, m68*-netx-*,
        m68*-*-vxworks*, mips*-*-vxworks*, powerpc-*-vxworks*, and
        sparc-*-vxworks*.
        * NEWS: Mention that vxworks was deleted.
	(...)
        * remote-vxmips.c, remote-vx.c: Delete.
        * remote-vx68.c: Delete.
	(...)

This removes related leftover cruft from the testsuite.

Tested on x86_64 Fedora 20, native and gdbserver.

gdb/testsuite/
2014-09-16  Pedro Alves  <palves@redhat.com>

	* config/vx.exp, config/vxworks.exp, config/vxworks29k.exp: Delete
	files.
	* gdb.base/a2-run.exp: Remove all code guarded by istarget
	"*-*-vxworks*" throughout.
	* gdb.base/break.exp: Likewise.
	* gdb.base/default.exp: Likewise.
	* gdb.base/scope.exp: Likewise.
	* gdb.base/sepdebug.exp: Likewise.
	* gdb.base/break.c: Remove all code guarded by #ifdef vxworks
	throughout.
	* gdb.base/run.c: Likewise.
	* gdb.base/sepdebug.c: Likewise.
	* gdb.hp/gdb.aCC/run.c: Likewise.
	* gdb.reverse/until-reverse.c: Likewise.
	* lib/gdb.exp (gdb_compile): Remove is_vxworks branch.
Make the linker return an error status if it fails to merge ARM binaries with
different architecture tags.  Add a test case to make sure that this works,
and update readelf so that it will not seg-fault when trying to display the
attributes of binaries with invalid architecture tags.

	* elf32-arm.c (elf32_arm_merge_eabi_attributes): Return false if
	failed to merge.

	* ld-arm/attr-merge-arch-2.d: New test case.
	* ld-arm/attr-merge-arch-2a.s: New test case source file.
	* ld-arm/attr-merge-arch-2b.s: Likewise.
	* ld-arm/arm-elf.exp: Run new test case.

	* readelf.c (display_arm_attribute): Use unsigned int type for
	tag, val and type variables.
Add hardware watchpoint support for x86 GNU Hurd.

	gdb/
	* config/i386/i386gnu.mh (NATDEPFILES): Add x86-nat.o and
	x86-dregs.o.
	* gnu-nat.c (inf_threads): New function.
	* gnu-nat.h (inf_threads_ftype): New typedef.
	(inf_threads): New declaration.
	* i386gnu-nat.c: Include "x86-nat.h" and "inf-child.h".
	[i386_DEBUG_STATE] (i386_gnu_dr_get, i386_gnu_dr_set)
	(i386_gnu_dr_set_control_one, i386_gnu_dr_set_control)
	(i386_gnu_dr_set_addr_one, i386_gnu_dr_set_addr)
	(i386_gnu_dr_get_reg, i386_gnu_dr_get_addr, 386_gnu_dr_get_status)
	(i386_gnu_dr_get_control): New functions.
	(reg_addr): New structure.
	(_initialize_i386gnu_nat) [i386_DEBUG_STATE]: Initialize hardware
	i386 debugging register hooks.
	* NEWS: Mention this.
Add test to make sure GDB knows which "kind" of watchpoint the target has

This adds a test that makes sure GDB knows whether the target has
continuable, or non-continuable watchpoints.

That is, the test confirms that GDB presents a watchpoint value change
at the first instruction right after the instruction that changes
memory.

gdb/testsuite/ChangeLog:
2014-09-16  Pedro Alves  <palves@redhat.com>

	* gdb.base/watchpoint-stops-at-right-insn.c: New file.
	* gdb.base/watchpoint-stops-at-right-insn.exp: New file.
Fix watchpoint-stops-at-right-insn.exp

Silly typo...

gdb/testsuite/
2014-09-16  Pedro Alves  <palves@redhat.com>

	* gdb.base/watchpoint-stops-at-right-insn.exp (test): Compare
	software and hardware addresses, not software address against
	itself.
Rename current_inferior as current_thread in gdbserver

GDB has a function named "current_inferior" and gdbserver has a global
variable named "current_inferior", but the two are not equivalent;
indeed, gdbserver does not have any real equivalent of what GDB calls
an inferior.  What gdbserver's "current_inferior" is actually pointing
to is a structure describing the current thread.  This commit renames
current_inferior as current_thread in gdbserver to clarify this.  It
also renames the function "set_desired_inferior" to "set_desired_thread"
and renames various local variables from foo_inferior to foo_thread.

gdb/gdbserver/ChangeLog:

	* inferiors.h (current_inferior): Renamed as...
	(current_thread): New variable.  All uses updated.
	* linux-low.c (get_pc): Renamed saved_inferior as saved_thread.
	(maybe_move_out_of_jump_pad): Likewise.
	(cancel_breakpoint): Likewise.
	(linux_low_filter_event): Likewise.
	(wait_for_sigstop): Likewise.
	(linux_resume_one_lwp): Likewise.
	(need_step_over_p): Likewise.
	(start_step_over): Likewise.
	(linux_stabilize_threads): Renamed save_inferior as saved_thread.
	* linux-x86-low.c (x86_linux_update_xmltarget): Likewise.
	* proc-service.c (ps_lgetregs): Renamed reg_inferior as reg_thread
	and save_inferior as saved_thread.
	* regcache.c (get_thread_regcache): Renamed saved_inferior as
	saved_thread.
	(regcache_invalidate_thread): Likewise.
	* remote-utils.c (prepare_resume_reply): Likewise.
	* thread-db.c (thread_db_get_tls_address): Likewise.
	(disable_thread_event_reporting): Likewise.
	(remove_thread_event_breakpoints): Likewise.
	* tracepoint.c (gdb_agent_about_to_close): Renamed save_inferior
	as saved_thread.
	* target.h (set_desired_inferior): Renamed as...
	(set_desired_thread): New declaration.  All uses updated.
	* server.c (myresume): Updated comment to reference thread instead
	of inferior.
	(handle_serial_event): Likewise.
	(handle_target_event): Likewise.
Remove documention of dead "target vxworks"

"target vxworks" and friends have been removed 10 years ago already:

  commit e84ecc995d6a5e4e9114d3cea61717b8a573afb6
  Author:     Andrew Cagney <cagney@redhat.com>
  AuthorDate: Sat Nov 13 23:10:02 2004 +0000

     2004-11-13  Andrew Cagney  <cagney@gnu.org>

         * configure.tgt: Delete i[34567]86-*-vxworks*, m68*-netx-*,
         m68*-*-vxworks*, mips*-*-vxworks*, powerpc-*-vxworks*, and
         sparc-*-vxworks*.
         * NEWS: Mention that vxworks was deleted.
     (...)
         * remote-vxmips.c, remote-vx.c: Delete.
         * remote-vx68.c: Delete.
     (...)

This removes related leftover cruft from the manual.

gdb/doc/
2014-09-16  Pedro Alves  <palves@redhat.com>

	* gdb.texinfo (Starting) <run command>: Don't mention VxWorks.
	(Embedded OS): Remove VxWorks menu entry.
	(VxWorks): Remove node.
Add -mevexrcig={rne|rd|ru|rz} option to x86 assembler.

It is used to control which value is encoded in rounding control bits
for SAE-only EVEX instructions.

gas/
	* config/tc-i386.c (evexrcig): New.
	(build_evex_prefix): Force rounding bits.
	(OPTION_MEVEXRCIG): New.
	(md_longopts): Add mevexrcig.
	(md_parse_option): Handle OPTION_MEVEXRCIG.
	(md_show_usage): Document mevexrcig.
	* doc/c-i386.texi (mevexrcig): Document new option.

gas/testsuite/
	* gas/i386/avx512dq-rcig.s: New.
	* gas/i386/avx512dq-rcigrd-intel.d: Likewise.
	* gas/i386/avx512dq-rcigrd.d: Likewise.
	* gas/i386/avx512dq-rcigrne-intel.d: Likewise.
	* gas/i386/avx512dq-rcigrne.d: Likewise.
	* gas/i386/avx512dq-rcigru-intel.d: Likewise.
	* gas/i386/avx512dq-rcigru.d: Likewise.
	* gas/i386/avx512dq-rcigrz-intel.d: Likewise.
	* gas/i386/avx512dq-rcigrz.d: Likewise.
	* gas/i386/avx512er-rcig.s: Likewise.
	* gas/i386/avx512er-rcigrd-intel.d: Likewise.
	* gas/i386/avx512er-rcigrd.d: Likewise.
	* gas/i386/avx512er-rcigrne-intel.d: Likewise.
	* gas/i386/avx512er-rcigrne.d: Likewise.
	* gas/i386/avx512er-rcigru-intel.d: Likewise.
	* gas/i386/avx512er-rcigru.d: Likewise.
	* gas/i386/avx512er-rcigrz-intel.d: Likewise.
	* gas/i386/avx512er-rcigrz.d: Likewise.
	* gas/i386/avx512f-rcig.s: Likewise.
	* gas/i386/avx512f-rcigrd-intel.d: Likewise.
	* gas/i386/avx512f-rcigrd.d: Likewise.
	* gas/i386/avx512f-rcigrne-intel.d: Likewise.
	* gas/i386/avx512f-rcigrne.d: Likewise.
	* gas/i386/avx512f-rcigru-intel.d: Likewise.
	* gas/i386/avx512f-rcigru.d: Likewise.
	* gas/i386/avx512f-rcigrz-intel.d: Likewise.
	* gas/i386/avx512f-rcigrz.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcig.s: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrd-intel.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrd.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrne-intel.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrne.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigru-intel.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigru.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrz-intel.d: Likewise.
	* gas/i386/x86-64-avx512dq-rcigrz.d: Likewise.
	* gas/i386/x86-64-avx512er-rcig.s: Likewise.
	* gas/i386/x86-64-avx512er-rcigrd-intel.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrd.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrne-intel.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrne.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigru-intel.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigru.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrz-intel.d: Likewise.
	* gas/i386/x86-64-avx512er-rcigrz.d: Likewise.
	* gas/i386/x86-64-avx512f-rcig.s: Likewise.
	* gas/i386/x86-64-avx512f-rcigrd-intel.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrd.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrne-intel.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrne.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigru-intel.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigru.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrz-intel.d: Likewise.
	* gas/i386/x86-64-avx512f-rcigrz.d: Likewise.
	* gas/i386/i386.exp: Run new tests.
Fix PR12526: -location watchpoints for bitfield arguments

PR 12526 reports that -location watchpoints against bitfield arguments
trigger false positives when bits around the bitfield, but not the
bitfield itself, are modified.

This happens because -location watchpoints naturally operate at the
byte level, not at the bit level.  When the address of a bitfield
lvalue is taken, information about the bitfield (i.e. its offset and
size) is lost in the process.

This information must first be retained throughout the lifetime of the
-location watchpoint.  This patch achieves this by adding two new
fields to the watchpoint struct: val_bitpos and val_bitsize.  These
fields are set when a watchpoint is first defined in watch_command_1.
They are both equal to zero if the watchpoint is not a -location
watchpoint or if the argument is not a bitfield.

Then these bitfield parameters are used inside update_watchpoint and
watchpoint_check to extract the actual value of the bitfield from the
watchpoint address, with the help of a local helper function
extract_bitfield_from_watchpoint_value.

Finally when creating a HW breakpoint pointing to a bitfield, we
optimize the address and length of the breakpoint.  By skipping over
the bytes that don't cover the bitfield, this step reduces the
frequency at which a read watchpoint for the bitfield is triggered.
It also reduces the number of times a false-positive call to
check_watchpoint is triggered for a write watchpoint.

gdb/
	PR breakpoints/12526
	* breakpoint.h (struct watchpoint): New fields val_bitpos and
	val_bitsize.
	* breakpoint.c (watch_command_1): Use these fields to retain
	bitfield information.
	(extract_bitfield_from_watchpoint_value): New function.
	(watchpoint_check): Use it.
	(update_watchpoint): Use it.  Optimize the address and length of a
	HW watchpoint pointing to a bitfield.
	* value.h (unpack_value_bitfield): New prototype.
	* value.c (unpack_value_bitfield): Make extern.

gdb/testsuite/
	PR breakpoints/12526
	* gdb.base/watch-bitfields.exp: New file.
	* gdb.base/watch-bitfields.c: New file.
gdb.base/watch-bitfields.exp: Improve test

Make test messages unique and a couple other tweaks.

gdb/testsuite/
2014-09-16  Sergio Durigan Junior  <sergiodj@redhat.com>
	    Pedro Alves  <palves@redhat.com>

	* gdb.base/watch-bitfields.exp: Pass string other than test file
	name to prepare_for_testing.
	(watch): New procedure.
	(expect_watchpoint): Use with_test_prefix.
	(top level): Factor out tests to ...
	(test_watch_location, test_regular_watch): ... these new
	procedures, and use with_test_prefix and gdb_continue_to_end.
Replace "fprintf (stderr..." by "fprintf_unfiltered (gdb_stdlog..."

This is an obvious replacement of "fprintf (stderr..." by
"fprintf_unfiltered (gdb_stdlog...", which is the standard to use in
these cases.

gdb/ChangeLog:
2014-09-16  Sergio Durigan Junior  <sergiodj@redhat.com>

	PR cli/7233
	* linux-nat.c (linux_nat_wait_1): Replace "fprintf (stderr..." by
	"fprintf_unfiltered (gdb_stdlog...)".
Remove dead code from objc-lang.c (spurious "fprintf (stderr...")

This obvious change removes dead code from objc-lang.c.  I was
grepping for "fprintf (stderr..." and found this code between "#if
0".."#endif" blocks.

2014-09-16  Sergio Durigan Junior  <sergiodj@redhat.com>

	* objc-lang.c (find_implementation_from_class): Remove dead code.
Fix CPPFLAGS handling in gdbserver's build.

In gdb/gdbserver/Makefile.in, IPAGENT_CFLAGS is defined using
an expression which references $(CPPFLAGS). But CPPFLAGS isn't
actually defined.

This patch first adds a CPPFLAGS definition, so as to inherit
the value passed at configure time (if any). And it then makes it
part of INTERNAL_CFLAGS_BASE, instead. There is no reason that
CPPFLAGS be useful for a certain class of source files, and not
the rest. This is also consistent with what's done in GDB.

gdb/gdbserver/ChangeLog:

        * Makefile.in (CPPFLAGS): Define.
        (INTERNAL_CFLAGS_BASE): Add ${CPPFLAGS}.
        (IPAGENT_CFLAGS): Remove ${CPPFLAGS}.

Tested by rebuilding GDBserver with a dummy CPPFLAGS, and verifying
that the compilation command was altered as expected.
CONTRIBUTE: For internals refer to wiki, not gdb/doc
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