Fix for PR gdb/17235: possible bug extracting systemtap probe operand

This patch is a fix to PR gdb/17235.  The bug is about an unused
variable that got declared and set during one of the parsing phases of
an SDT probe's argument.  I took the opportunity to rewrite some of the
code to improve the parsing.  The bug was actually a thinko, because
what I wanted to do in the code was to discard the number on the string
being parsed.

During this portion, the code identifies that it is dealing with an
expression that begins with a sign ('+', '-' or '~').  This means that
the expression could be:

- a numeric literal (e.g., '+5')
- a register displacement (e.g., '-4(%rsp)')
- a subexpression (e.g., '-(2*3)')

So, after saving the sign and moving forward 1 char, now the code needs
to know if there is a digit followed by a register displacement prefix
operand (e.g., '(' on x86_64).  If yes, then it is a register
operation.  If not, then it will be handled recursively, and the code
will later apply the requested operation on the result (either a '+', a
'-' or a '~').

With the bug, the code was correctly discarding the digit (though using
strtol unnecessarily), but it wasn't properly dealing with
subexpressions when the register indirection prefix was '(', like on
x86_64.  This patch also fixes this bug, and includes a testcase.  It
passes on x86_64 Fedora 20.
Regenerate top-level configure.

Our top-level configure somehow got out of sync the current
configure.ac, so this patch regenerates it.

ChangeLog:

	* configure: Regenerate.
daily update
infcmd.c (program_info): Fix typo.

gdb/ChangeLog:

	* infcmd.c (program_info): Fix typo.
PR 15276: Add $_caller_is, $_caller_matches, $_any_caller_is, $_any_caller_matches

gdb/ChangeLog:

	PR 15276
	* NEWS: Mention $_caller_is, $_caller_matches, $_any_caller_is,
	$_any_caller_matches.
	* data-directory/Makefile.in (PYTHON_FILE_LIST): Add caller_is.py.
	* python/lib/gdb/function/caller_is.py: New file.

gdb/testsuite/ChangeLog:

	PR 15276
	* gdb.python/py-caller-is.c: New file.
	* gdb.python/py-caller-is.exp: New file.

gdb/doc/ChangeLog:

	PR 15276
	* gdb.texinfo (Convenience Funs): Document $_caller_is,
	$_caller_matches, $_any_caller_is, $_any_caller_matches.
Add missing author to previous entry (PR 15276).
MIPS testsuite cleanup - part 1

binutils/testsuite/

	* binutils-all/readelf.ss-mips: Account for new sections.

gas/testsuite/

	* gas/elf/type.e: Account for new sections.
	* gas/mips/mips16-e.d: Likewise.
	* gas/mips/mips16-f.d: Likewise.
	* gas/mips/mipsel16-e.d: Likewise.
	* gas/mips/mipsel16-f.d: Likewise.
	* gas/mips/tmips16-e.d: Appropriately escape dots.
	* gas/mips/tmips16-f.d: Likewise.
	* gas/mips/tmipsel16-e.d: Likewise.
	* gas/mips/tmipsel16-f.d: Likewise.
MIPS testsuite cleanup - part 2

gas/testsuite/

	* gas/mips/module-defer-warn2.l: Ignore differences in output from
	64-bit vs 32-bit targets using O32.
MIPS testsuite cleanup - part 3

gas/testsuite/

	* gas/mips/attr-gnu-abi-fp-1.d: Relax expected output.
	* gas/mips/elf_ase_micromips-2.d: Likewise.
	* gas/mips/elf_ase_micromips.d: Likewise.
	* gas/mips/elf_ase_mips16-2.d: Likewise.
	* gas/mips/elf_ase_mips16.d: Likewise.
	* gas/mips/module-mfp32.d: Likewise.
	* gas/mips/module-msingle-float.d: Likewise.
	* gas/mips/module-msoft-float.d: Likewise.
MIPS testsuite cleanup - part 4

ld/testsuite/

	* ld-mips-elf/abiflags-strip1-ph.d: Ignore big/little endian
	differences. Ignore program headers other than PT_MIPS_ABIFLAGS.
	Do not force -32, -EB and ld emulation but instead rely on the
	test driver to build for some form of O32.
	* ld-mips-elf/abiflags-strip2-ph.d: Likewise.
	* ld-mips-elf/abiflags-strip3-ph.d: Likewise.
	* ld-mips-elf/abiflags-strip4-ph.d: Likewise.
	* ld-mips-elf/abiflags-strip5-ph.d: Likewise.
	* ld-mips-elf/abiflags-strip6-ph.d: Likewise.
	* ld-mips-elf/abiflags-strip7-ph.d: Likewise.
	* ld-mips-elf/abiflags-strip8-ph.d: Likewise.
	* ld-mips-elf/abiflags-strip9-ph.d: Likewise.
	* ld-mips-elf/attr-gnu-4-0-ph.d: Likewise.
	* ld-mips-elf/attr-gnu-4-05.d: Likewise.
	* ld-mips-elf/attr-gnu-4-06.d: Likewise.
	* ld-mips-elf/attr-gnu-4-07.d: Likewise.
	* ld-mips-elf/attr-gnu-4-1-ph.d: Likewise.
	* ld-mips-elf/attr-gnu-4-10.d: Likewise.
	* ld-mips-elf/attr-gnu-4-15.d: Likewise.
	* ld-mips-elf/attr-gnu-4-16.d: Likewise.
	* ld-mips-elf/attr-gnu-4-17.d: Likewise.
	* ld-mips-elf/attr-gnu-4-2-ph.d: Likewise.
	* ld-mips-elf/attr-gnu-4-25.d: Likewise.
	* ld-mips-elf/attr-gnu-4-26.d: Likewise.
	* ld-mips-elf/attr-gnu-4-27.d: Likewise.
	* ld-mips-elf/attr-gnu-4-3-ph.d: Likewise.
	* ld-mips-elf/attr-gnu-4-35.d: Likewise.
	* ld-mips-elf/attr-gnu-4-36.d: Likewise.
	* ld-mips-elf/attr-gnu-4-37.d: Likewise.
	* ld-mips-elf/attr-gnu-4-4-ph.d: Likewise.
	* ld-mips-elf/attr-gnu-4-45.d: Likewise.
	* ld-mips-elf/attr-gnu-4-46.d: Likewise.
	* ld-mips-elf/attr-gnu-4-47.d: Likewise.
	* ld-mips-elf/attr-gnu-4-5-ph.d: Likewise.
	* ld-mips-elf/attr-gnu-4-50.d: Likewise.
	* ld-mips-elf/attr-gnu-4-51.d: Likewise.
	* ld-mips-elf/attr-gnu-4-52.d: Likewise.
	* ld-mips-elf/attr-gnu-4-53.d: Likewise.
	* ld-mips-elf/attr-gnu-4-54.d: Likewise.
	* ld-mips-elf/attr-gnu-4-55.d: Likewise.
	* ld-mips-elf/attr-gnu-4-56.d: Likewise.
	* ld-mips-elf/attr-gnu-4-57.d: Likewise.
	* ld-mips-elf/attr-gnu-4-58.d: Likewise.
	* ld-mips-elf/attr-gnu-4-6-ph.d: Likewise.
	* ld-mips-elf/attr-gnu-4-60.d: Likewise.
	* ld-mips-elf/attr-gnu-4-61.d: Likewise.
	* ld-mips-elf/attr-gnu-4-62.d: Likewise.
	* ld-mips-elf/attr-gnu-4-63.d: Likewise.
	* ld-mips-elf/attr-gnu-4-64.d: Likewise.
	* ld-mips-elf/attr-gnu-4-65.d: Likewise.
	* ld-mips-elf/attr-gnu-4-66.d: Likewise.
	* ld-mips-elf/attr-gnu-4-67.d: Likewise.
	* ld-mips-elf/attr-gnu-4-68.d: Likewise.
	* ld-mips-elf/attr-gnu-4-7-ph.d: Likewise.
	* ld-mips-elf/attr-gnu-4-70.d: Likewise.
	* ld-mips-elf/attr-gnu-4-71.d: Likewise.
	* ld-mips-elf/attr-gnu-4-72.d: Likewise.
	* ld-mips-elf/attr-gnu-4-73.d: Likewise.
	* ld-mips-elf/attr-gnu-4-74.d: Likewise.
	* ld-mips-elf/attr-gnu-4-75.d: Likewise.
	* ld-mips-elf/attr-gnu-4-76.d: Likewise.
	* ld-mips-elf/attr-gnu-4-77.d: Likewise.
	* ld-mips-elf/attr-gnu-4-78.d: Likewise.
	* ld-mips-elf/mips-elf.exp: Update default abi_asflags(o32) to explicitly
	pass -32 for the 'no abi' configurations.  Modify the way attr-gnu* tests
	are run to use O32 flags appropriate for the current target.
daily update
Fix crash on Python frame filters with unreadable arg

https://bugzilla.redhat.com/show_bug.cgi?id=1126177

ERROR: AddressSanitizer: SEGV on unknown address 0x000000000050 (pc 0x000000992bef sp 0x7ffff9039530 bp 0x7ffff9039540
T0)
    #0 0x992bee in value_type .../gdb/value.c:925
    #1 0x87c951 in py_print_single_arg python/py-framefilter.c:445
    #2 0x87cfae in enumerate_args python/py-framefilter.c:596
    #3 0x87e0b0 in py_print_args python/py-framefilter.c:968

It crashes because frame_arg::val is documented it may contain NULL
(frame_arg::error is then non-NULL) but the code does not handle it.

Another bug is that py_print_single_arg() calls goto out of its TRY_CATCH
which messes up GDB cleanup chain crashing GDB later.

It is probably 7.7 regression (I have not verified it) due to the introduction
of Python frame filters.

gdb/ChangeLog

	PR python/17355
	* python/py-framefilter.c (py_print_single_arg): Handle NULL FA->VAL.
	Fix goto out of TRY_CATCH.

gdb/testsuite/ChangeLog

	PR python/17355
	* gdb.python/amd64-py-framefilter-invalidarg.S: New file.
	* gdb.python/py-framefilter-invalidarg-gdb.py.in: New file.
	* gdb.python/py-framefilter-invalidarg.exp: New file.
	* gdb.python/py-framefilter-invalidarg.py: New file.
Fix PR gdb/17035: "show user" doesn't list user-defined commands that
have empty bodies.

User-defined commands that have empty bodies weren't being shown because
the print function returned too soon.  Now, it prints the command's name
before checking if it has any body at all.  This also fixes the same
problem on "show user <myemptycommand>", which wasn't being printed due
to a similar reason.

gdb/Changelog:

	* cli/cli-cmds.c (show_user): Use cli_user_command_p to
	decide whether we display the command on "show user".
	* cli/cli-script.c (show_user_1): Only verify cmdlines after
	printing command name.
	* cli/cli-decode.h (cli_user_command_p): Declare new function.
	* cli/cli-decode.c (cli_user_command_p): Create helper function
	to verify whether cmd_list_element is a user-defined command.

gdb/testsuite/Changelog:

	* gdb.base/commands.exp: Add tests to verify user-defined
	commands with empty bodies.
	* gdb.python/py-cmd.exp: Test that we don't show user-defined
	python commands in `show user command`.
	* gdb.python/scm-cmd.exp: Test that we don't show user-defined
	scheme commands in `show user command`.
daily update
Introduce show_debug_regs

This commit adds a new global flag show_debug_regs to common-debug.h
to replace the flag debug_hw_points used by gdbserver and by the
Linux x86 and AArch64 ports, and to replace the flag maint_show_dr
used by the Linux MIPS port.

gdb/ChangeLog:

	* common/common-debug.h (show_debug_regs): Declare.
	* common/common-debug.c (show_debug_regs): Define.
	* aarch64-linux-nat.c (debug_hw_points): Don't define.  Replace
	all uses with show_debug_regs.  Replace all uses that considered
	debug_hw_points as a multi-value integer with straight boolean
	uses.
	* x86-nat.c (debug_hw_points): Don't define.  Replace all uses
	with show_debug_regs.
	* nat/x86-dregs.c (debug_hw_points): Don't declare.  Replace
	all uses with show_debug_regs.
	* mips-linux-nat.c (maint_show_dr): Don't define.  Replace all
	uses with show_debug_regs.

gdb/gdbserver/ChangeLog:

	* server.h (debug_hw_points): Don't declare.
	* server.c (debug_hw_points): Don't define.  Replace all uses
	with show_debug_regs.
	* linux-aarch64-low.c (debug_hw_points): Don't define.  Replace
	all uses with show_debug_regs.
Introduce target/target.h

This introduces target/target.h.  This file declares some functions
that the shared code can use and that clients must implement.  It also
changes some shared code to use these functions.

gdb/ChangeLog:

	* target/target.h: New file.
	* Makefile.in (HFILES_NO_SRCDIR): Add target/target.h.
	* target.h: Include target/target.h.
	(target_read_memory, target_write_memory): Don't declare.
	* target.c (target_read_uint32): New function.
	* common/agent.c: Include target/target.h.
	[!GDBSERVER]: Don't include target.h.
	(helper_thread_id): Type changed to uint32_t.
	(agent_get_helper_thread_id): Use target_read_uint32.
	(agent_run_command): Always use target_read_memory and
	target_write_memory.
	(agent_capability): Type changed to uint32_t.
	(agent_capability_check): Use target_read_uint32.

gdb/gdbserver/ChangeLog:

	* target.h: Include target/target.h.
	* target.c (target_read_memory, target_read_uint32)
	(target_write_memory): New functions.
Introduce target_{stop,continue}_ptid

This commit introduces two new functions to stop and restart target
processes that shared code can use and that clients must implement.
It also changes some shared code to use these functions.

gdb/ChangeLog:

	* target/target.h (target_stop_ptid, target_continue_ptid):
	Declare.
	* target.c (target_stop_ptid, target_continue_ptid): New
	functions.
	* common/agent.c [!GDBSERVER]: Don't include infrun.h.
	(agent_run_command): Always use target_stop_ptid and
	target_continue_ptid.

gdb/gdbserver/ChangeLog:

	* target.c (target_stop_ptid, target_continue_ptid): New
	functions.
Introduce target/symbol.h

This introduces target/symbol.h.  This file declares a function that
the shared code can use and that the clients must implement.  It also
changes some shared code to use these functions.

gdb/ChangeLog:

	* target/symbol.h: New file.
	* Makefile.in (HFILES_NO_SRCDIR): Add target/symbol.h.
	* target.h: Include target/symbol.h.
	* minsyms.c (find_minimal_symbol_address): New function.
	* common/agent.c: Include target/symbol.h.
	[!GDBSERVER]: Don't include objfiles.h.
	(agent_look_up_symbols): Use find_minimal_symbol_address.

gdb/gdbserver/ChangeLog:

	* symbol.c: New file.
	* Makefile.in (SFILES): Add symbol.c.
	(OBS): Add symbol.o.
Introduce common-regcache.h

This introduces common-regcache.h.  This contains two functions that
allow nat/linux-btrace.c to be simplified.  A better long term
solution would be unify the regcache code, but this is sufficient for
now.

gdb/ChangeLog:

	* common/common-regcache.h: New file.
	* Makefile.in (HFILES_NO_SRCDIR): Add common/common-regcache.h.
	* regcache.h: Include common-regcache.h.
	(regcache_read_pc): Don't declare.
	* regcache.c (get_thread_regcache_for_ptid): New function.
	* nat/linux-btrace.c: Don't include regcache.h.
	Include common-regcache.h.
	(perf_event_read_bts): Use get_thread_regcache_for_ptid.

gdb/gdbserver/ChangeLog:

	* regcache.h: Include common-regcache.h.
	(regcache_read_pc): Don't declare.
	* regcache.c (get_thread_regcache_for_ptid): New function.
Include common-defs.h instead of defs.h/server.h in shared code

This commit makes 19 of the 22 shared .c files in common, nat and
target include common-defs.h instead of defs.h/server.h.  The
remaining three files need slight extra work and are dealt with
in separate commits.

gdb/ChangeLog:

	* common/agent.c: Include common-defs.h.
	Don't include defs.h or server.h.
	* common/buffer.c: Likewise.
	* common/common-debug.c: Likewise.
	* common/common-utils.c: Likewise.
	* common/errors.c: Likewise.
	* common/filestuff.c: Likewise.
	* common/format.c: Likewise.
	* common/gdb_vecs.c: Likewise.
	* common/print-utils.c: Likewise.
	* common/ptid.c: Likewise.
	* common/rsp-low.c: Likewise.
	* common/signals.c: Likewise.
	* common/vec.c: Likewise.
	* common/xml-utils.c: Likewise.
	* nat/linux-osdata.c: Likewise.
	* nat/linux-procfs.c: Likewise.
	* nat/linux-ptrace.c: Likewise.
	* nat/mips-linux-watch.c: Likewise.
	* target/waitstatus.c: Likewise.