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Move GDB/MI commands related to support-query to their own @node.

A number of commands provide the capability to query the debugger
about support for various features, and one of them in particular
(-list-features), is expected to grow as new features get added.
-list-target-features should also grow a bit over time, but probably
slower.

These commands deserve their own section and @node.

gdb/doc/ChangeLog:

        * gdb.texinfo (GDB/MI): Add "GDB/MI Support Commands" entry
        in menu.
        (GDB/MI Variable Objects): Adjust reference to "-list-features"
        command, now in a new node.
        (GDB/MI Support Commands): New node, with its contents being
        extracted from the "GDB/MI Miscellaneous Commands" node.
        A small paragraph introducing the section is also added at
        the start.
        (GDB/MI Miscellaneous Commands): Delete the description of the
        -info-gdb-mi-command, -list-features and -list-target-features
        commands, now hosted in the "GDB/MI Support Commands" node.
Some cleanups on stap-probe.c

This patch does some basic cleanups on the SystemTap SDT probes API.  It
removes spurious newlines, brackets, reindents some code, and do
explicit checks for NULL, NUL, and 0 where applicable.

2013-12-23  Sergio Durigan JUnior  <sergiodj@redhat.com>

	* stap-probe.c (struct stap_probe) <args_parsed>: Add comment.
	(stap_is_generic_prefix): Delete extra brackets.  Reindent.
	(stap_parse_register_operand): Remove spurious newlines.  Simplify
	code to parse special token.
	(stap_parse_argument_conditionally): Add gdb_assert.
	(stap_parse_argument_1): Likewise.  Explicitly check for NULL and
	NUL.
	(stap_parse_probe_arguments): Likewise.
	(handle_stap_probe): Likewise.  Reindent code.
	(get_stap_base_address): Explicitly check for NULL.
	(stap_get_probes): Likewise.  Reindent code.
	(stap_relocate): Explicitly check for 0.
	(stap_gen_info_probes_table_values): Likewise.
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2013-12-17  Sterling Augustine  <saugustine@google.com>

	* linespec.c (add_sal_to_sals): Use "<unknown>" when a symbol
	isn't found.
Reorganize extension language auto-loading docs.

	* gdb.texinfo (Auto-loading): Move menu up.  Move discussion of
	auto-loaded objfile scripts and .debug_gdb_scripts section to their
	corresponding section in Extending GDB.
	(Extending GDB): Move menu up.  New menu item "Auto-loading
	extensions".
	(Sequences): New menu item "Auto-loading sequences".
	(Auto-loading sequences): New node.
	(Python): Rename section from Scripting GDB to Extending GDB.
	(Python Auto-loading): Update xref, refer to "Auto-loading extensions".
	Move docs on ways to auto-load extensions to ...
	(Auto-loading extensions): ... here.  New node.
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Turn -list-feature @table into @ftable.

This is to make it easier to discover the various options displayed
by the -list-features command.

gdb/doc/ChangeLog:

        * gdb.texinfo (GDB/MI Support Commands): Change @table into
        @ftable.
Fix gdb.Field attributes documentation for enum types.

The following patch ...

    | commit 14e75d8ea4fe9ed4dbf292ae4a9745e33e2ff353
    | Date:   Wed Apr 18 06:46:47 2012 +0000
    |
    |     gdb/
    |         PR symtab/7259:
    | [...]

... discussed under ...

    [PATCH] Allow 64-bit enum values
    http://www.sourceware.org/ml/gdb-patches/2012-03/msg00772.html

... introduced a change in the gdb.Fields API without documenting it:

    | I took a separate approach from the one I took in:
    |
    | http://sourceware.org/ml/gdb-patches/2012-02/msg00403.html
    |
    | and removed the overloaded meaning of the bitpos location variable to
    | fix PR symtab/7259. In the following patch, I introduce a separate
    | field_location union member 'enumval' which can accept LONGEST and
    | hence expand enum values to 64-bit signed values. With this change,
    | bitpos now only is used for (non-negative) offsets into structures,
    | since the other overload of bitpos (range bounds) were already
    | separated into struct range_bound.

This patch updates the documentation to reflect that change.

gdb/doc/ChangeLog:

        * gdb.texinfo (Types In Python): Fix the documentation of
        attribute "bitpos" in class gdb.Field for enum types.  Add
        documentation for attribute "enumval" in that same class.
	Adjust MMIX gas tests for recent bfd/elf.c change.
	* gas/mmix/bspec-1.d: Adjust for SHF_INFO_LINK now set on RELA
	sections.
	* gas/mmix/bspec-2.d: Ditto.
Implement SystemTap SDT probe support for AArch64

This commit implements the needed bits for SystemTap SDT probe support
on AArch64 architectures.

First, I started by looking at AArch64 assembly specification and
filling the necessary options on gdbarch's stap machinery in order to
make the generic asm parser (implemented in stap-probe.c) recognize
AArch64's asm.

After my last patch for the SystemTap SDT API, which extends it in order
to accept multiple prefixes and suffixes, this patch became simpler.  I
also followed Marcus suggestion and did not shared code between 32- and
64-bit ARM.

Tom asked me in a previous message how I did my tests.  I believe I
replied that, but just in case: I ran the tests on
gdb.base/stap-probe.exp by hand.  I also managed to run the tests on
real hardware, and they pass without regressions.

2013-12-28  Sergio Durigan Junior  <sergiodj@redhat.com>

	PR tdep/15653
	* NEWS: Mention SystemTap SDT probe support for AArch64 GNU/Linux.
	* aarch64-linux-tdep.c: Include necessary headers for parsing of
	SystemTap SDT probes.
	(aarch64_stap_is_single_operand): New function.
	(aarch64_stap_parse_special_token): Likewise.
	(aarch64_linux_init_abi): Declare SystemTap SDT probe argument
	prefixes and suffixes.  Initialize gdbarch with them.
Extend handling of immediates on ARM's SystemTap SDT probe support

Continuing my series of fixes on the SystemTap SDT support for the
ARM/AArch64 architectures, this patch now extends how ARM's SDT specific
parser handles literal numbers (immediates).

Currently, it only accepts "#" as the prefix.  However, according to
"info '(as) ARM-Chars'", expressions can also have "$" and nothing as a
prefix.  This patch extends the parser to accept those options.

2013-12-28  Sergio Durigan Junior  <sergiodj@redhat.com>

	* arm-linux-tdep.c (arm_stap_is_single_operand): Accept "$" as a
	literal prefix.  Also accept no prefix at all.
	(arm_stap_parse_special_token): Likewise.
	(arm_linux_init_abi): Likewise.
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Add comment describing arm_stap_is_single_operand

2013-12-29  Sergio Durigan Junior  <sergiodj@redhat.com>

	* arm-linux-tdep.c (arm_stap_is_single_operand): Add comment
	describing function.
Clarify documentation of the gdb.Field.bitpos attribute

gdb/doc/ChangeLog:

        * gdb.texinfo (Types In Python): Clarify the documentation
        of attribute gdb.Field.bitpos.
	* peXXigen.c (rsrc_process_section): Use ptrdiff_t as the type for
	pointer arithmetic.
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