git.libre-soc.org Git - binutils-gdb.git/log

Debugging without a binary (regression)

When we attempt to debug a process using GDBserver in standard remote mode
without a symbol file on GDB's end, we may run into an issue where GDB cuts
the connection attempt short due to an error. The error is caused by not
being able to open a symbol file, like so:

--

(gdb) set sysroot
(gdb) tar rem :2345
Remote debugging using :2345
/proc/23769/exe: Permission denied.
(gdb) i r
The program has no registers now.
(gdb)

It should've been like this:

(gdb) set sysroot
(gdb) tar rem :2345
Remote debugging using :2345
warning: /tmp/symbol-file: Permission denied.
0xf7ddb2d0 in ?? ()
(gdb) i r
eax            0x0  0
ecx            0x0  0
edx            0x0  0
ebx            0x0  0
esp            0xffffdfa0 0xffffdfa0
ebp            0x0  0x0
esi            0x0  0
edi            0x0  0
eip            0xf7ddb2d0 0xf7ddb2d0
eflags         0x200  [ IF ]
cs             0x33 51
ss             0x2b 43
ds             0x0  0
es             0x0  0
fs             0x0  0
gs             0x0  0
(gdb)

This is caused by a couple of function calls within exec_file_locate_attach
that can potentially throw errors.

The following patch guards both exec_file_attach and symbol_file_add_main to
prevent the errors from disrupting the connection process.

There was also a case where native GDB tripped on this problem, but it was
mostly fixed by bf74e428bca61022bd5cdf6bf28789a184748b4d.

Regression-tested on x86-64/Ubuntu.

gdb/ChangeLog:

2016-04-13  Luis Machado  <lgustavo@codesourcery.com>

* exec.c (exec_file_locate_attach): Guard a couple functions
that can throw errors.
(exception_print_same): New helper function.

Fix zero_ext documentation

This patch fixes the documentation for the zero_ext bytecode description.

It removes parts that seemed like a copy/paste from ext, since zero_ext
zeros the bits to the left.

gdb/doc/ChangeLog:

* agentexpr.texi (zero_ext): Fix zero_ext description.

[ARC] Fix setting private elf flags when parsing .cpu.

gas/
2016-04-12 Claudiu Zissulescu <claziss@synopsys.com>

* config/tc-arc.c (mach_type_specified_p): Change type to
bfd_boolean.
(arc_option): Set private flags when parsing cpu pseudo-op.
(md_parse_option): Set mach_type_specified_p to TRUE.

Fix and improve comment in gdb_remote_download

This patch fixes the current comment in gdb_remote_download, which is
false (the "except if that's already where it is" part). It also
improves it, by explaining why pass TOFILE through standard_output_file,
even it is an absolute path.

gdb/testsuite/ChangeLog:

* lib/gdb.exp (gdb_remote_download): Fix and extend comment.

Add support to readelf for detecting and reporting Solaris specific section types and symbol visibility.

PR target/19983
* readelf.c (get_solaris_section_type): New function: Returns the
name of Solaris specific section types.
(get_solaris_dynamic_type): New function: Return the name of
Solaris specific dynamic types.
(get_dynamic_type): Use get_solaris_dynamic_type.
(get_section_type_name): Use get_solaris_section_type.
(get_solaris_symbol_visibility): New function: Returns Solaris
specific symbol visibilities.
(print_dynamic_symbol): Use get_solaris_symbol_visibility.
(process_symbol_table): Likewise.

ld/testsuite: Initialise a variable to prevent tcl errors

In some cases a variable could be left uninitialised and then an attempt
made to read this variable, resulting in a tcl error. This commit
initialises the variable in all cases.

ld/ChangeLog:

* testsuite/lib/ld-lib.exp (run_dump_test): Initialise
check_ld(terminal).

gdbserver-base.exp: Copy file to standard output directory in ${board}_download

gdbserver-base.exp is used as the base for both native-gdbserver.exp and
native-extended-gdbserver.exp.  (Despite its name, it should really be
considered as a "local-gdbserver-base", as it's not really appropriate to
implement a remote gdbserver board.)

Currently, the _download procedure is implemented as a no-op (it returns
the source file path).  Because of the SONAME change, The fast
tracepoint tests now require the executable and the IPA
(libinproctrace.so) to be located in the same directory (see [1]).  When
using the native-gdbserver board, because _download returns the original
file path, the executable does not end up in the same directory as the
library, and it fails to execute.

In more general terms, with the recent changes, the testsuite now
assumes that when it does

  ${board}_download <source path 1> <destination path 1>
  ${board}_download <source path 2> <destination path 2>

where the destination paths are relative (generally just the file name),
both files will end up in the same base directory.  That assumption does
not hold for the current implementation in gdbserver-base.exp.

The proper fix would be to make native-gdbserver non-remote, so that
gdb_remote_download would not call DejaGnu's remote_download (see [2]).
We could then get rid of ${board}_download in gdbserver-base.exp.
However, that will likely take some time to complete.  In the mean time,
in order to make the fast tracepoint tests pass, we can simply copy the
file to the standard output directory.  Basically, it just mimics what
gdb_remote_download would do if the board wasn't flagged as remote.

Note that I missed these failures originally because I had a
libinproctrace.so in /usr/local/lib.  So, even though libinproctrace.so
wasn't copied to the test output directory, it did find the one in
/usr/local/lib.  It would be nice to find a way to protect against this,
as it could easily happen again...

Regtested with unix, native-gdbserver and native-extended-gdbserver, and
didn't see anything notable, except the ftrace tests now passing for
native-gdbserver.

[1] https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=6e774b13c3b81ac2599812adf058796948ce7e95
[2] https://sourceware.org/ml/gdb-patches/2016-04/msg00112.html

gdb/testsuite/ChangeLog:

* boards/gdbserver-base.exp (${board}_download): Copy source file to
standard output directory.

oops - omitted from previous delta.

Fix disassembly of the V850's LD.BU instruction.

PR target/19937
opcode * v850-opc.c (v850_opcodes): Correct masks for long versions of
the LD.B and LD.BU instructions.

gas * testsuite/gas/v850/pr19937.s: New test.
* testsuite/gas/v850/pr19937.d: New test control file.
* testsuite/gas/v850/basic.exp: Run the new test.

Fix aarch64 ftrace JIT condition testcase

This patch fixes the following failure:
FAIL: gdb.trace/trace-condition.exp: ftrace: -(21 << 1) == -42: check 10
frames were collected.

This was due to aarch64_emit_sub using the wrong order in its operands, so the
operation would end up being 42 - 0 rather than 0 - 42.

This patch also fixes the order of aarch64_emit_add for clarity.

The test case for emit_sub is fixed so that the proper order of
the operands is needed for the test to pass.

Tested on aarch64-native-extended-gdbserver.

Note: trace-condition.exp was broken a bit so I had to modify it to run
the test. A fix is coming for that in another patch.

gdb/gdbserver/ChangeLog:

* linux-aarch64-low.c (aarch64_emit_add): Switch x1 and x0.
(aarch64_emit_sub): Likewise.

gdb/testsuite/ChangeLog:

* gdb.trace/trace-condition.exp (foreach): Fix emit_sub testcase.

Fix PR remote/19840: gdb crashes on reverse-stepi

Reverse debugging against a remote target that does reverse debugging
itself (with the bs/bc packets) always trips on:

(gdb) target remote localhost:...
(gdb) reverse-stepi
../../gdb/target.c:602: internal-error: default_execution_direction: to_execution_direction must be implemented for reverse async

I missed adding a to_execution_direction method to remote.c in commit
3223143295b5 (Adds target_execution_direction to make record targets
support async mode), GDB 7.4 time. Later, GDB 7.8 switched to
target-async on by default, making the regression user-visible by
default too.

Fix is simply to add the missing to_execution_direction implementation
to target remote.

Tested by Andi Kleen against Simics.

gdb/ChangeLog:
2016-04-13 Pedro Alves <palves@redhat.com>

PR remote/19840
* remote.c (struct remote_state) <last_resume_exec_dir>: New
field.
(new_remote_state): Default last_resume_exec_dir to EXEC_FORWARD.
(remote_open_1): Reset last_resume_exec_dir to EXEC_FORWARD.
(remote_resume): Store the last execution direction.
(remote_execution_direction): New function.
(init_remote_ops): Install it as to_execution_direction target_ops
method.

btrace: fix test build error in gdb.btrace/instruction_history.c

On systems with a newer version of GCC the gdb.btrace/instruction_history.exp
test fails to build like this:

    Running .../gdb.btrace/instruction_history.exp ...
    gdb compile failed, .../gdb.btrace/instruction_history.c:
    In function 'main': .../gdb.btrace/instruction_history.c:24:3: warning:
    implicit declaration of function 'loop' [-Wimplicit-function-declaration]
       loop ();
       ^

Declare loop to fix it.

testsuite/
* gdb.btrace/instruction_history.c (loop): Add declaration.

Update x86-64 tests for --as-needed

Since compiler may pass --as-needed to ld by default, link .o file
before .so file in x86-64 tests.

PR ld/19774
* testsuite/ld-x86-64/x86-64.exp: Link tmpdir/pr17689b.o before
tmpdir/pr17689.so, fix gotpcrel1 test and add more --as-needed
tests.

MIPS/GAS: Correct branch relaxation for weak symbols

Weak symbols can be preempted at link time so always choose the longer
sequence in branch relaxation, according to the relaxation level chosen,
so that any symbol finally used as the branch target is reachable.

2016-04-13 Maciej W. Rozycki <macro@imgtec.com>
Andrew Bennett <andrew.bennett@imgtec.com>

gas/
* config/tc-mips.c (relaxed_branch_length): Use the long
sequence where the target is a weak symbol.
(relaxed_micromips_32bit_branch_length): Likewise.
(relaxed_micromips_16bit_branch_length): Likewise.
* testsuite/gas/mips/branch-weak-1.d: New test.
* testsuite/gas/mips/branch-weak-2.d: New test.
* testsuite/gas/mips/branch-weak-3.d: New test.
* testsuite/gas/mips/branch-weak-4.d: New test.
* testsuite/gas/mips/branch-weak-5.d: New test.
* testsuite/gas/mips/branch-weak.l: New stderr output.
* testsuite/gas/mips/branch-weak.s: New test source.
* testsuite/gas/mips/mips.exp: Run the new tests.

MIPS/GAS: Relax branches to symbols resolved at link time

Where branch relaxation is enabled emit the long sequence for branches
whose distance cannot be determined, i.e. to symbols that are undefined
or in a different segment.  These symbols are only resolved at link time
and therefore the longer sequence ensures the branch target is in range,
which cannot be guaranteed with a direct branch.

This is the opposite to the current implementation, originally proposed
here: <https://sourceware.org/ml/binutils/2002-09/msg00218.html>.  The
proposal was then extensively discussed before the final version was
posted here: <https://sourceware.org/ml/binutils/2002-10/msg00191.html>
and eventually committed:

commit 4a6a3df43dbb37853a7b88b10ae97d9ec5daf987
Author: Alexandre Oliva <aoliva@redhat.com>
Date:   Sat Oct 12 05:23:33 2002 +0000

The case considered here was not commented in the review however and the
original version remains.  With branch relaxation enabled it makes more
sense to do it consistently, so that all code impure with respect to
branch distances can be linked.  Direct branches are still produced for
the cases concerned where branch relaxation is disabled, which is the
default.

gas/
* config/tc-mips.c (relaxed_branch_length): Use the long
sequence where the distance cannot be determined.
(relaxed_micromips_32bit_branch_length): Likewise.
* testsuite/gas/mips/branch-extern-1.d: New test.
* testsuite/gas/mips/branch-extern-2.d: New test.
* testsuite/gas/mips/branch-extern-3.d: New test.
* testsuite/gas/mips/branch-extern-4.d: New test.
* testsuite/gas/mips/branch-extern.l: New stderr output.
* testsuite/gas/mips/branch-extern.s: New test source.
* testsuite/gas/mips/branch-section-1.d: New test.
* testsuite/gas/mips/branch-section-2.d: New test.
* testsuite/gas/mips/branch-section-3.d: New test.
* testsuite/gas/mips/branch-section-4.d: New test.
* testsuite/gas/mips/branch-section.l: New stderr output.
* testsuite/gas/mips/branch-section.s: New test source.
* testsuite/gas/mips/mips.exp: Run the new tests.

Add init_dwarf_regnames_s390

Define and use DWARF register names for s390.

binutils/ChangeLog:

* dwarf.h (init_dwarf_regnames_s390): Declare.
* dwarf.c (dwarf_regnames_s390): New.
(init_dwarf_regnames_s390): New.
(init_dwarf_regnames): Call it.
* objdump.c (dump_dwarf): Likewise.

Automatic date update in version.in

Fix typo in ftrace.exp condition testing

This obvious patch replaces "ond" wiht "cond" as the test prefix for
conditional tests.

gdb/testsuite/ChangeLog:

* gdb.trace/ftrace.exp (proc): Change test prefix from "ond" to "cond".

[C++] Switch TRY/CATCH to real C++ try/catch by default again

Now that we don't ever throw GDB exceptions from signal handlers [1],
we can switch back to having TRY/CATCH implemented in terms of C++
try/catch instead of sigjmp/longjmp.

[1] - https://sourceware.org/ml/gdb-patches/2016-03/msg00351.html

Tested on x86_64 Fedora 23, native and gdbserver.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* common/common-exceptions.h (GDB_XCPT_TRY): Update comment.
[__cplusplus] (GDB_XCPT): Define as GDB_XCPT_TRY.

Use setjmp/longjmp for TRY/CATCH instead of sigsetjmp/siglongjmp

Now that we don't ever throw GDB exceptions from signal handlers [1],
we can switch to have TRY/CATCH implemented in terms of plain
setjmp/longjmp instead of sigsetjmp/siglongjmp.

In https://sourceware.org/ml/gdb-patches/2015-02/msg00114.html, Yichun
Zhang mentions a 11%/14%+ speedup in his GDB python scripts with a
patch that did something similar to only a specific set of TRY/CATCH
calls.

[1] - https://sourceware.org/ml/gdb-patches/2016-03/msg00351.html

Tested on x86_64 Fedora 23, native and gdbserver.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* common/common-exceptions.c (struct catcher) <buf>: Now a
'jmp_buf' instead of SIGJMP_BUF.
(exceptions_state_mc_init): Change return type to 'jmp_buf'.
(throw_exception): Use longjmp instead of SIGLONGJMP.
* common/common-exceptions.h: Include <setjmp.h> instead of
"gdb_setjmp.h".
(exceptions_state_mc_init): Change return type to 'jmp_buf'.
[GDB_XCPT == GDB_XCPT_SJMP] (TRY): Use setjmp instead of
SIGSETJMP.
* cp-support.c: Include "gdb_setjmp.h".

Eliminate prepare_to_throw_exception

No longer necessary.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* common/common-exceptions.c (exception_rethrow): Remove
prepare_to_throw_exception call.
* common/common-exceptions.h (prepare_to_throw_exception): Delete
declaration.
* exceptions.c (prepare_to_throw_exception): Delete.

gdb/gdbserver/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* utils.c (prepare_to_throw_exception): Delete.

Eliminate target_check_pending_interrupt

This is no longer called anywhere.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* target.c (target_check_pending_interrupt): Delete.
* target.h (struct target_ops) <to_check_pending_interrupt>:
Remove method.
(target_check_pending_interrupt): Remove declaration.
* target-delegates.c: Regenerate.

Eliminate immediate_quit

This finally gets rid of immediate_quit (and surrounding
infrustruture), as nothing sets it anymore.

gdb_call_async_signal_handler was only necessary in order to handle
immediate_quit. We can just call mark_async_signal_handler directly
on all hosts now.

In turn, we can clean up mingw-hdep.c's gdb_select a bit, as
sigint_event / sigint_handler is no longer needed.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* defs.h: Update comments on SIGINT handling.
(immediate_quit): Delete declaration.
* event-loop.c (call_async_signal_handler): Delete.
* event-loop.h (call_async_signal_handler): Delete declaration.
(mark_async_signal_handler): Update comments.
(gdb_call_async_signal_handler): Delete declaration.
* event-top.c (handle_sigint): Call mark_async_signal_handler
instead of gdb_call_async_signal_handler.
* exceptions.c (prepare_to_throw_exception): Remove reference to
immediate_quit.
(exception_fprintf): Remove comments about immediate_quit.
* mingw-hdep.c (sigint_event, sigint_handler): Delete.
(gdb_select): Don't wait on sigint_event.
(gdb_call_async_signal_handler): Delete.
(_initialize_mingw_hdep): Delete.
* posix-hdep.c (gdb_call_async_signal_handler): Delete.
* utils.c (immediate_quit): Delete.

target remote: Don't rely on immediate_quit (introduce quit handlers)

remote.c is the last user of immediate_quit.  It's relied on to
immediately break the initial remote connection sync up, if the user
does Ctrl-C, assuming that was because the target isn't responding.
At that stage, since the connection isn't synced yet, disconnecting is
the only safe thing to do.  This commit reworks that, to not rely on
throwing from the SIGINT signal handler.

So, this commit:

- Introduces the concept of a "quit handler".  This is used to
  override what does the QUIT macro do when the quit flag is set.

- Makes the "struct serial" reachar / write code call QUIT in the
  partial read/write loops, so the current quit handler is invoked
  whenever a serial->read_prim / serial->write_prim returns EINTR.

- Makes the "struct serial" reachar / write code call
  interruptible_select instead of gdb_select, so that QUITs are
  detected in a race-free manner.

- Stops remote.c from setting immediate_quit during the initial
  connection.

- Instead, we install a custom quit handler whenever we're calling
  into the serial code.  This custom quit handler knows to immediately
  throw a quit when we're in the initial connection setup, and
  otherwise defer handling the quit/Ctrl-C request to later, when
  we're safely out of a packet command/response sequence.  This also
  is what is now responsible for handling "double Ctrl-C because
  target connection is stuck/wedged."

- remote.c no longer installs a specialized SIGINT handlers, and
  instead re-uses the quit flag.  Since we want to rely on the QUIT
  macro, the SIGINT handler must also set the quit.  And the easiest
  is just to not install custom SIGINT handler in remote.c.  Let the
  standard SIGINT handler do its job of setting the quit flag.
  Centralizing SIGINT handlers seems like a good thing to me, anyway.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* defs.h (quit_handler_ftype, quit_handler)
(make_cleanup_override_quit_handler, default_quit_handler): New.
(QUIT): Adjust comments.
* event-top.c (default_quit_handler): New function.
(quit_handler): New global.
(struct quit_handler_cleanup_data): New.
(restore_quit_handler, restore_quit_handler_dtor)
(make_cleanup_override_quit_handler): New.
(async_request_quit): Call QUIT.
* remote.c (struct remote_state) <got_ctrlc_during_io>: New field.
(async_sigint_remote_twice_token, async_sigint_remote_token):
Delete.
(remote_close): Update comments.
(remote_start_remote): Don't set immediate_quit.  Set starting_up
earlier.
(remote_serial_quit_handler, remote_unpush_and_throw): New
functions.
(remote_open_1): Clear got_ctrlc_during_io.  Set
remote_async_terminal_ours_p unconditionally.
(async_initialize_sigint_signal_handler)
(async_handle_remote_sigint, async_handle_remote_sigint_twice)
(remote_check_pending_interrupt, async_remote_interrupt)
(async_remote_interrupt_twice)
(async_cleanup_sigint_signal_handler, ofunc)
(sync_remote_interrupt, sync_remote_interrupt_twice): Delete.
(remote_terminal_inferior, remote_terminal_ours): Remove async
checks.
(remote_wait_as): Don't install a SIGINT handler in sync mode.
(readchar, remote_serial_write): Override the quit handler with
remote_serial_quit_handler.
(getpkt_or_notif_sane_1): Don't call QUIT.
(initialize_remote_ops): Don't install
remote_check_pending_interrupt.
(_initialize_remote): Don't create async_sigint_remote_token and
async_sigint_remote_twice_token.
* ser-base.c (ser_base_wait_for): Call QUIT and use
interruptible_select.
(ser_base_write): Call QUIT.
* ser-go32.c (dos_readchar, dos_write): Call QUIT.
* ser-unix.c (wait_for): Don't use VTIME.  Always take the
gdb_select path, but call QUIT and interruptible_select.
* utils.c (maybe_quit): Call the current quit handler.  Don't call
target_check_pending_interrupt.
(defaulted_query, prompt_for_continue): Override the quit handler
with the default quit handler.

TUI: GC tui_target_has_run

Nothing actually uses this global.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* tui/tui-hooks.c (tui_target_has_run): Delete.
(tui_about_to_proceed): Delete.
(tui_about_to_proceed_observer): Delete.
(tui_install_hooks, tui_remove_hooks): Don't install/remove an
about_to_proceed observer.

Use target_terminal_ours_for_output in MI

The MI code only does output, so leave raw/cooked mode alone, as well
as the SIGINT handler.  Restore terminal settings after output, while
at it.  Also, a couple events missed calling target_terminal_ours
before output, even.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* mi/mi-interp.c (mi_new_thread): Put
target_terminal_ours_for_output in effect while outputting.
(mi_thread_exit): Use target_terminal_ours_for_output instead of
target_terminal_ours.
(mi_record_changed, mi_inferior_added, mi_inferior_appeared)
(mi_inferior_exit, mi_inferior_removed, mi_traceframe_changed)
(mi_tsv_created, mi_tsv_deleted, mi_tsv_modified)
(mi_breakpoint_created, mi_breakpoint_deleted)
(mi_breakpoint_modified, mi_solib_loaded, mi_solib_unloaded)
(mi_command_param_changed, mi_memory_changed)
(report_initial_inferior): Use target_terminal_ours_for_output
instead of target_terminal_ours.  Restore terminal settings.
* mi/mi-main.c (mi_execute_command): Use
target_terminal_ours_for_output instead of target_terminal_ours.
Restore terminal settings.

Do target_terminal_ours in query & friends instead of in all callers

Any time a caller calls query & friends / prompt_for_continue without
ensuring that gdb owns the terminal for input is a bug.  So do that in
defaulted_query / prompt_for_continue directly instead.

An example of a case where we currently miss calling
target_terminal_ours is internal_error.  Ever since defaulted_query
was made to use gdb_readline_callback, there's no way to answer the
internal error query if the internal error happens while the target is
has the terminal:

  (gdb) c
  Continuing.
  .../src/gdb/linux-nat.c:1676: internal-error: linux_nat_resume: Assertion `dummy_counter < 10' failed.
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Quit this debugging session? (y or n) _

Entering 'y' or 'n' does not work, GDB does not respond.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

PR gdb/19828
* gnu-nat.c (inf_validate_task_sc): Don't call
target_terminal_ours / target_terminal_inferior around query.
* i386-tdep.c (i386_record_lea_modrm, i386_process_record): Don't
call target_terminal_ours / target_terminal_inferior around
yquery.
* linux-record.c (record_linux_system_call): Don't call
target_terminal_ours / target_terminal_inferior around yquery.
* nto-procfs.c (interrupt_query): Don't call target_terminal_ours
/ target_terminal_inferior around query.
* record-full.c (record_full_check_insn_num): Remove
'set_terminal' parameter.  Don't call target_terminal_ours /
target_terminal_inferior around query.
(record_full_message, record_full_registers_change)
(record_full_xfer_partial): Adjust.
* remote.c (interrupt_query): Don't call target_terminal_ours /
target_terminal_inferior around query.
* utils.c (defaulted_query): Install cleanup to restore target
terminal.  Put target_terminal_ours_for_output in effect while
defaulted producing, and target_terminal_ours in in effect while
handling input.
(prompt_for_continue): Install cleanup to restore target terminal.
Put target_terminal_ours in in effect while handling input.

Add missing cleanups to defaulted_query and prompt_for_continue

Some of the error paths in these functions leak.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* utils.c (defaulted_query, prompt_for_continue): Free temporary
strings with cleanups, instead of xfree.

Use target_terminal_ours_for_output in warning/internal_error

We're only doing output here, so leave raw/cooked mode alone, as well
as the SIGINT handler.

And restore terminal settings, while at it.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* utils.c (vwarning, internal_vproblem): Use
make_cleanup_restore_target_terminal and
target_terminal_ours_for_output.

Use target_terminal_ours_for_output in infcmd.c

We're only doing output here, so leave raw/cooked mode alone, as well
as the SIGINT handler.

No need to restore terminal settings, we'll set inferior modes on the
following resume.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* infcmd.c (post_create_inferior, prepare_one_step): Use
target_terminal_ours_for_output instead of target_terminal_ours.

Use target_terminal_ours_for_output in exceptions.c

We're only doing output here, so leave raw/cooked mode alone, as well
as the SIGINT handler.

Restore terminal settings after output, while at it.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* exceptions.c (print_flush): Use target_terminal_ours_for_output
instead of target_terminal_ours, and restore target terminal with
a cleanup.

Use target_terminal_ours_for_output in cp-support.c

We're only doing output here, so leave raw/cooked mode alone, as well
as the SIGINT handler.

Restore terminal settings after output, while at it.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* cp-support.c (gdb_demangle): Use target_terminal_ours_for_output
instead of target_terminal_ours, and restore target terminal with
a cleanup.

ada-lang.c: Introduce type_as_string and use it

A couple wrong things here

  - We should not use target_terminal_ours when all we want is output.
    We should use target_terminal_ours_for_output instead, which
    preserves raw/cooked terminal modes, and SIGINT forwarding.

  - Most importantly, relying on stderr output immediately preceding
    the error/exception print isn't correct.  The exception could be
    caught and handled, for example; MI frontends won't display the
    stderr part in an error dialog box.  Etc.

This commit introduces a type_as_string helper that allows building a
full error string including type info.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* ada-lang.c (type_as_string, type_as_string_and_cleanup): New
functions.
(ada_lookup_struct_elt_type): Use type_as_string_and_cleanup.

Fix inconsistent handling of EINTR in ser-*.c backends

- If serial->write_prim returns EINTR, ser_bas_write returns it to the
  caller.  This just looks wrong to me -- part of the output may have
  already been sent, and there's no way for the caller to know that,
  and thus no way for a caller to handle a partial write correctly.

- While ser-unix.c:ser_unix_read_prim retries on EINTR,
  ser-tcp.c:net_read_prim does not.

This commit moves EINTR handling to the ser_base_write and
ser_base_readchar level, so all serial backends (at least those that
use it) end up handling EINTR consistently.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* ser-base.c (fd_event): Retry read_prim on EINTR.
(do_ser_base_readchar): Retry read_prim on EINTR.
(ser_base_write): Retry write_prim on EINTR.
* ser-unix.c (ser_unix_read_prim): Don't retry on EINTR here.
(ser_unix_write_prim): Remove comment.

Pass Ctrl-C to the target in target_terminal_inferior

If the user presses Ctrl-C immediately before target_terminal_inferior
is called and the target is resumed, instead of after, the Ctrl-C ends
up pending in the quit flag until the target next stops.

remote.c has this bit to handle this:

      if (!target_is_async_p ())
{
  ofunc = signal (SIGINT, sync_remote_interrupt);
  /* If the user hit C-c before this packet, or between packets,
     pretend that it was hit right here.  */
  if (check_quit_flag ())
    sync_remote_interrupt (SIGINT);
}

But that's only reachable if async is off, while async is on by
default nowadays.  It's also obviously not reacheable on native
targets.

This patch generalizes that to all targets.

We can't remove that remote.c bit yet, until we get rid of the sync
SIGINT handler though.  That'll be done later in the series.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* remote.c (remote_pass_ctrlc): New function.
(init_remote_ops): Install it.
* target.c (target_terminal_inferior): Pass pending Ctrl-C to the
target.
(target_pass_ctrlc, default_target_pass_ctrlc): New functions.
* target.h (struct target_ops) <to_pass_ctrlc>: New method.
(target_pass_ctrlc, default_target_pass_ctrlc): New declarations.
* target-delegates.c: Regenerate.

Decouple target_interrupt from all-stop/non-stop modes

In non-stop mode, "interrupt" results in a "stop with no signal",
while in all-stop mode, it results in a remote interrupt request /
stop with SIGINT.  This is currently implemented in both the Linux and
remote target backends.  Move it to the core code instead, making
target_interrupt specifically always about "Interrupting as if with
Ctrl-C", just like it is documented.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* infcmd.c (interrupt_target_1): Call target_stop is in non-stop
mode.
* linux-nat.c (linux_nat_interrupt): Delete.
(linux_nat_add_target): Don't install linux_nat_interrupt.
* remote.c (remote_interrupt_ns): Change return type to void.
Throw error if interrupting the target is not supported.
(remote_interrupt): Don't call the remote_stop_ns/remote_stop_as.

Eliminate clear_quit_flag

Nothing calls this anymore.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* defs.h (clear_quit_flag): Remove declaration.
* extension-priv.h (struct extension_language_ops)
<clear_quit_flag>: Remove field and update comments.
* extension.c (clear_quit_flag): Delete.
* guile/guile.c (guile_extension_ops): Adjust.
* python/python.c (python_extension_ops): Adjust.
(gdbpy_clear_quit_flag): Delete.

Don't call clear_quit_flag in captured_main

This call seems pointless.  For instance, a SIGINT handler is only
installed later on.  And if wasn't, I can't see why we'd want to lose
a Ctrl-C request.

Getting rid of this allows getting rid of clear_quit_flag.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* main.c (captured_main): Don't clear the quit flag.

Don't call clear_quit_flag in prepare_to_throw_exception

I think this is reminiscent of the time when a longjmp would always
jump to the top level.  Nowaways code that throw exceptions other than
a quit, which may even be caught and handled without reaching the top
level.  Certainly such exceptions shouldn't clear an interrupt
request...

(We also need to get rid of prepare_to_throw_exception in order to be
able to just do "throw ex;" in C++.)

One could argue that we should clear the quit flag when we throw a
quit from the SIGINT handler, when immediate_quit is in effect, to
handle a race, here:

immediate_quit++;
QUIT;

... that's the usual pattern code must use when enabling
immediate_quit.  The QUIT is there to catch the case of Ctrl-C having
already been pressed before immediate_quit was enabled.  However, this
can happen:

immediate_quit++;
<< Ctrl-C pressed here too.
QUIT;

And in that case, if the quit flag was already set, it'll stay set
even after throwing a quit from the SIGINT handler.  The end result is
a double quit.  But OTOH, the user did press Ctrl-C two times.  Since
I'm getting rid of immediate_quit, I'm not bothering with this.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* exceptions.c (prepare_to_throw_exception): Don't clear the quit
flag.

Don't call clear_quit_flag in command_handler

This just looks totally wrong to me, for completetly discarding a
user-requested Ctrl-C. I can't think of why we'd want do this here.

Actually, I digged the history, and found out that this has been here
since at least 7b4ac7e1ed2c (gdb-2.4, the initial revision, 1988), at
a time were we had a top level setjmp/longjmp, long before that got
wrapped in throw_exception and friends, and this code was in an
explicit loop, with the quit_flag cleared on every iteration, before
executing a command...

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* event-top.c (command_handler): Don't call clear_quit_flag.

Don't call clear_quit_flag after check_quit_flag

Obviously not necessary since check_quit_flag clears the flag as side
effect.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* remote-sim.c (gdb_os_poll_quit): Don't call clear_quit_flag.
* remote.c (remote_wait_as): Don't call clear_quit_flag.

Make Python use a struct serial event

Now that we have an abstract for wakeable events, use it instead of a
(heavier) serial pipe.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* python/python.c: Include "ser-event.h".
(gdbpy_event_fds): Delete.
(gdbpy_serial_event): New.
(gdbpy_run_events): Change prototype. Use serial_event_clear
instead of serial_readchar.
(gdbpy_post_event): Use serial_event_set instead of serial_write.
(gdbpy_initialize_events): Use make_serial_event instead of
serial_pipe.

Introduce interruptible_select

We have places where we call a blocking gdb_select expecting that a
Ctrl-C will unblock it.  However, if the Ctrl-C is pressed just before
gdb_select, the SIGINT handler runs before gdb_select, and thus
gdb_select won't return.

For example gdb_readline_no_editing:

       QUIT;

       /* Wait until at least one byte of data is available.  Control-C
          can interrupt gdb_select, but not fgetc.  */
       FD_ZERO (&readfds);
       FD_SET (fd, &readfds);
       if (gdb_select (fd + 1, &readfds, NULL, NULL, NULL) == -1)

and stdio_file_read:

     /* For the benefit of Windows, call gdb_select before reading from
the file.  Wait until at least one byte of data is available.
Control-C can interrupt gdb_select, but not read.  */
     {
       fd_set readfds;
       FD_ZERO (&readfds);
       FD_SET (stdio->fd, &readfds);
       if (gdb_select (stdio->fd + 1, &readfds, NULL, NULL, NULL) == -1)
return -1;
     }
     return read (stdio->fd, buf, length_buf);

This is a race classically fixed with either the self-pipe trick, or
by blocking SIGINT and then using pselect instead of select.

Blocking SIGINT most of the time would mean that check_quit_flag (and
thus QUIT) would need to do a syscall every time it is called, which
sounds best avoided, since QUIT is called in many loops.  Thus we take
the self-pipe trick route (wrapped in a serial event).

Instead of having all places that need this manually add an extra file
descriptor to the set of gdb_select's watched file descriptors, we
introduce a wrapper, interruptible_select, that does that.

The Windows version of gdb_select actually does not suffer from this,
because mingw-hdep.c:gdb_call_async_signal_handler sets a Windows
event that gdb_select always waits on.  So this patch can be seen as
generalization of that technique.  We can't remove that extra event
from mingw-hdep.c until we get rid of immediate_quit though.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* defs.h: Extend QUIT-related comments to mention
interruptible_select.
(quit_serial_event_set, quit_serial_event_clear): Declare.
* event-top.c: Include "ser-event.h" and "gdb_select.h".
(quit_serial_event): New global.
(async_init_signals): Make quit_serial_event.
(quit_serial_event_set, quit_serial_event_clear)
(quit_serial_event_fd, interruptible_select): New functions.
* extension.c (set_quit_flag): Set the quit serial event.
(check_quit_flag): Clear the quit serial event.
* gdb_select.h (interruptible_select): New declaration.
* guile/scm-ports.c (ioscm_input_waiting): Use
interruptible_select instead of gdb_select.
* top.c (gdb_readline_no_editing): Likewise.
* ui-file.c (stdio_file_read): Likewise.

Fix signal handler/event-loop races

GDB's core signal handling suffers from a classical signal handler /
mainline code race:

  int
  gdb_do_one_event (void)
  {
  ...
  /* First let's see if there are any asynchronous signal handlers
       that are ready.  These would be the result of invoking any of the
       signal handlers.  */
    if (invoke_async_signal_handlers ())
      return 1;
  ...
    /* Block waiting for a new event.  (...).  */

    if (gdb_wait_for_event (1) < 0)
      return -1;
  ...
  }

If a signal is delivered while gdb is blocked in the poll/select
inside gdb_wait_for_event, then the select/poll breaks with EINTR,
we'll loop back around and call invoke_async_signal_handlers.

However, if the signal handler runs between
invoke_async_signal_handlers and gdb_wait_for_event,
gdb_wait_for_event will block, until the next unrelated event...

The fix is to a struct serial_event, and register it in the set of
files that select/poll in gdb_wait_for_event waits on.  The signal
handlers that defer work to invoke_async_signal_handlers call
mark_async_signal_handler, which is adjusted to also set the new
serial event in addition to setting a flag, and is thus now is
garanteed to immediately unblock the next gdb_select/poll call, up
until invoke_async_signal_handlers is called and the event is cleared.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* event-loop.c: Include "ser-event.h".
(async_signal_handlers_serial_event): New global.
(async_signals_handler, initialize_async_signal_handlers): New
functions.
(mark_async_signal_handler): Set
async_signal_handlers_serial_event.
(invoke_async_signal_handlers): Clear
async_signal_handlers_serial_event.
* event-top.c (async_init_signals): Call
initialize_async_signal_handlers.

Introduce a serial interface for select'able events

This patch adds a new "event" struct serial type, that is an
abstraction specifically for waking up blocking waits/selects,
implemented on top of a pipe on POSIX, and on top of a native Windows
event (CreateEvent, etc.) on Windows.

This will be used to plug signal handler / mainline code races.

For example, GDB can indefinitely delay handling a quit request if the
user presses Ctrl-C between the last QUIT call and the next (blocking)
gdb_select call in the event loop:

      QUIT;
                  <<< press ctrl-c here and end up blocked in gdb_select
      indefinitely.

      gdb_select (...); // whoops, SIGINT was already handled, no EINTR.

A global alone (either the quit flag, or the "ready" flag of the async
signal handlers in the event loop) is not sufficient.

To plug races such as these on POSIX systems, we have to register some
waitable file descriptor in the set of files gdb_select waits on, and
write to it from the signal handler.  This is classically a pipe, and
the pattern called the self-pipe trick.  On Linux, it could be a more
efficient eventfd instead, but I'm sticking with a pipe for
simplifity, as we need it for portability anyway.

(Alternatively, we could use pselect/ppoll, and block signals until
the pselect.  The latter is not a design I think GDB could use,
because we want the QUIT macro to be super cheap, as it is used in
loops.  Plus, Windows.)

This is a "struct serial" because Windows's gdb_select relies on that.
Windows's gdb_select, our "select" replacement, knows how to wait on
all kinds of handles (regular files, pipes, sockets, console, etc.)
unlike the native Windows "select" function, which can only wait on
sockets.  Each file descriptor for a "serial" type that is not
normally waitable with WaitForMultipleObjects must have a
corresponding struct serial instance.  gdb_select then internally
looks up the struct serial instance that wraps each file descriptor,
and asks it for the corresponding Windows waitable handle.

We could use serial_pipe() to create a "struct serial"-wrapped pipe
that is usable everywhere, including Windows.  That's what currently
python/python.c uses for cross-thread posting of events.

However, serial_write and serial_readchar are not designed to be
async-signal-safe on POSIX hosts.  It's easier to bypass those when
setting/clearing the event source.

And writing and a serial pipe is a bit heavy weight on Windows.
gdb_select requires an extra thread to wait on the pipe and several
Windows events, when a single manual-reset Windows event, with no
extra thread is sufficient.

The intended usage is simply:

- Call make_serial_event to create a serial event object.

- From the signal handler call serial_event_set to set the event.

- From mainline code, have select/poll wait for serial_event_fd(), in
  addition to whatever other files you're about to wait for.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* Makefile.in (SFILES): Add ser-event.c.
(HFILES_NO_SRCDIR): Add ser-event.h.
(COMMON_OBS): Add ser-event.o.
* ser-event.c, ser-event.h: New files.
* serial.c (new_serial): New function, factored out from
(serial_fdopen_ops): ... this.
(serial_open_ops_1): New function, factored out from
(serial_open): ... this.
(serial_open_ops): New function.
* serial.h (struct serial): Forware declare.
(serial_open_ops): New declaration.

Remove unused struct serial::name field

Not used by anything.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* serial.c (serial_open, serial_fdopen_ops, do_serial_close):
Remove references to name.
* serial.h (struct serial) <name>: Delete.

Stop remote-fileio.c from throwing from SIGINT handler

This code installs a custom signal handler that throws a quit
exception if remote_fio_no_longjmp is not set.

AFAICS, the only real reason for this might have been to unblock the
ui_file_read call, in remote_fileio_func_read.  But ever since:

  2009-11-13  Daniel Jacobowitz  <dan@codesourcery.com>

* ui-file.c (stdio_file_read): Call gdb_select before read.

at:

  https://sourceware.org/ml/gdb-patches/2009-11/msg00321.html

that call is interruptible.

This is not only useful for switching to native C++ exceptions, but
AFAICS, also fixes a potential mess up of the remote protocol
connection, since there are target_read_memory calls done while
remote_fio_no_longjmp is clear.  If the user presses ctrl-c while GDB
is sending or receiving a packet, we'll stop the communication
immediately, at a point where it isn't safe.

gdbserver doesn't support the File I/O remote protocol extension so I
can't test this.

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* remote-fileio.c (sigint_fileio_token, remote_fio_no_longjmp):
Delete.
(async_remote_fileio_interrupt): Delete.
(remote_fileio_ctrl_c_signal_handler): Don't call the async signal
handler.  Instead just always set the ctrl_c flag.
(remote_fileio_reply): Clear remote_fio_ctrl_c_flag before
re-enabling the SIGINT handler.
(remote_fileio_func_open, remote_fileio_func_close)
(remote_fileio_func_read, remote_fileio_func_write)
(remote_fileio_func_lseek, remote_fileio_func_rename)
(remote_fileio_func_unlink, remote_fileio_func_stat)
(remote_fileio_func_fstat, remote_fileio_func_gettimeofday)
(remote_fileio_func_isatty, remote_fileio_func_system)
(remote_fileio_request): Remove references to
remote_fio_no_longjmp.
(initialize_remote_fileio): Don't create an async signal handler.

Don't set immediate_quit in prompt_for_continue

immediate_quit used to be necessary back when prompt_for_continue used
blocking fread, but nowadays it uses gdb_readline_wrapper, which is
implemented in terms of a nested event loop, which already knows how
to react to SIGINT:

#0  throw_it (reason=RETURN_QUIT, error=GDB_NO_ERROR, fmt=0x9d6d7e "Quit", ap=0x7fffffffcb88)
     at .../src/gdb/common/common-exceptions.c:324
#1  0x00000000007bab5d in throw_vquit (fmt=0x9d6d7e "Quit", ap=0x7fffffffcb88) at .../src/gdb/common/common-exceptions.c:366
#2  0x00000000007bac9f in throw_quit (fmt=0x9d6d7e "Quit") at .../src/gdb/common/common-exceptions.c:385
#3  0x0000000000773a2d in quit () at .../src/gdb/utils.c:1039
#4  0x000000000065d81b in async_request_quit (arg=0x0) at .../src/gdb/event-top.c:893
#5  0x000000000065c27b in invoke_async_signal_handlers () at .../src/gdb/event-loop.c:949
#6  0x000000000065aeef in gdb_do_one_event () at .../src/gdb/event-loop.c:280
#7  0x0000000000770838 in gdb_readline_wrapper (prompt=0x7fffffffcd40 "---Type <return> to continue, or q <return> to quit---")
     at .../src/gdb/top.c:873

The need for the QUIT in stdin_event_handler is then exposed by the
gdb.base/double-prompt-target-event-error.exp test, which has:

# We're now stopped in a pagination query while handling a
# target event (printing where the program stopped).  Quitting
# the pagination should result in only one prompt being
# output.
send_gdb "\003p 1\n"

Without that change we'd get:

Continuing.
---Type <return> to continue, or q <return> to quit---PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: continue to pagination
^CpQuit
(gdb)  1
Undefined command: "1".  Try "help".
(gdb) PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: first prompt
ERROR: Undefined command "".
UNRESOLVED: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: no double prompt

Vs:

Continuing.
---Type <return> to continue, or q <return> to quit---PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: continue to pagination
^CQuit
(gdb) p 1
$1 = 1
(gdb) PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: first prompt
PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: no double prompt

gdb/ChangeLog:
2016-04-12  Pedro Alves  <palves@redhat.com>

* event-top.c (stdin_event_handler): Call QUIT;
(prompt_for_continue): Don't run with immediate_quit set.

TUI: check whether in secondary prompt instead of immediate_quit

As can be seen in the tui_redisplay_readline comment:

"The command could call prompt_for_continue and we must not restore
SingleKey so that the prompt and normal keymap are used."

immediate_quit is being used as proxy for "secondary prompt".

We have a better predicate nowadays, so use it.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* tui/tui-io.c (tui_redisplay_readline): Check
gdb_in_secondary_prompt_p instead of immediate_quit.
* tui/tui.c: Include top.h.
(tui_rl_startup_hook): Check gdb_in_secondary_prompt_p instead of
immediate_quit.

Inline command_loop in read_command_line

read_command_line is the only caller, and here we can assume we're
reading a regular file, not stdin.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* top.c (read_command_file): Inline command_loop here.
(command_loop): Delete.

Don't rely on immediate_quit in command_line_input

AFAICS, immediate_quit was only needed here nowdays to be able to
interrupt gdb_readline_no_editing.

command_line_input can also take the gdb_readline_wrapper path, but
since that is built on top of the event loop (gdb_select / poll and
asynchronous signal handlers), it can be interrupted.

gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>

* top.c: Include "gdb_select.h".
(gdb_readline_no_editing): Wait for input with gdb_select instead
of blocking in fgetc.
(command_line_input): Don't set immediate_quit.

Add support for .extCondCode, .extCoreRegister and .extAuxRegister.

gas/
2016-04-05  Claudiu Zissulescu  <claziss@synopsys.com>

* testsuite/gas/arc/textauxregister.d: New file.
* testsuite/gas/arc/textauxregister.s: Likewise.
* testsuite/gas/arc/textcondcode.d: Likewise.
* testsuite/gas/arc/textcondcode.s: Likewise.
* testsuite/gas/arc/textcoreregister.d: Likewise.
* testsuite/gas/arc/textcoreregister.s: Likewise.
* testsuite/gas/arc/textpseudoop.d: Likewise.
* testsuite/gas/arc/textpseudoop.s: Likewise.
* testsuite/gas/arc/ld2.d: Update test.
* testsuite/gas/arc/st.d: Likewise.
* testsuite/gas/arc/taux.d: Likewise.
* doc/c-arc.texi (ARC Directives): Add .extCondCode,
.extCoreRegister and .extAuxRegister documentation.
* config/tc-arc.c (arc_extcorereg): New function.
(md_pseudo_table): Add .extCondCode, .extCoreRegister and
.extAuxRegister pseudo-ops.
(extRegister_t): New type.
(ext_condcode, arc_aux_hash): New global variable.
(find_opcode_match): Check for extensions.
(preprocess_operands): Likewise.
(md_begin): Add aux registers in a hash.
(assemble_insn): Update use arc_flags member.
(tokenize_extregister): New function.
(create_extcore_section): Likewise.
* config/tc-arc.h (MAX_FLAG_NAME_LENGHT): Increase to 10.
(arc_flags): Delete code, add flgp.

include/
2016-04-05  Claudiu Zissulescu  <claziss@synopsys.com>

* opcode/arc.h (flag_class_t): Update.
(ARC_OPCODE_NONE): Define.
(ARC_OPCODE_ARCALL): Likewise.
(ARC_OPCODE_ARCFPX): Likewise.
(ARC_REGISTER_READONLY): Likewise.
(ARC_REGISTER_WRITEONLY): Likewise.
(ARC_REGISTER_NOSHORT_CUT): Likewise.
(arc_aux_reg): Add cpu.

opcodes/
2016-04-05  Claudiu Zissulescu  <claziss@synopsys.com>

* arc-dis.c (find_format): Check for extension flags.
(print_flags): New function.
(print_insn_arc): Update for .extCondCode, .extCoreRegister and
.extAuxRegister.
* arc-ext.c (arcExtMap_coreRegName): Use
LAST_EXTENSION_CORE_REGISTER.
(arcExtMap_coreReadWrite): Likewise.
(dump_ARC_extmap): Update printing.
* arc-opc.c (arc_flag_classes): Add F_CLASS_EXTEND flag.
(arc_aux_regs): Add cpu field.
* arc-regs.h: Add cpu field, lower case name aux registers.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>

Update ARC instruction data-base.

gas/
2016-04-05 Claudiu Zissulescu <claziss@synopsys.com>

* testsuite/gas/arc/noargs_a7.d: New file.
* testsuite/gas/arc/noargs_a7.s: Likewise.
* testsuite/gas/arc/noargs_hs.d: Likewise.
* testsuite/gas/arc/noargs_hs.s: Likewise.

opcode/
2016-04-05 Claudiu Zissulescu <claziss@synopsys.com>

* arc-tbl.h: Add rtsc, sleep with no arguments.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>

Add support for .extInstruction pseudo-op.

gas/
2016-04-04  Claudiu Zissulescu  <claziss@synopsys.com>

* testsuite/gas/arc/textinsn-errors.d: New File.
* testsuite/gas/arc/textinsn-errors.err: Likewise.
* testsuite/gas/arc/textinsn-errors.s: Likewise.
* testsuite/gas/arc/textinsn2op.d: Likewise.
* testsuite/gas/arc/textinsn2op.s: Likewise.
* testsuite/gas/arc/textinsn2op01.d: Likewise.
* testsuite/gas/arc/textinsn2op01.s: Likewise.
* testsuite/gas/arc/textinsn3op.d: Likewise.
* testsuite/gas/arc/textinsn3op.s: Likewise.
* doc/c-arc.texi (ARC Directives): Add .extInstruction
documentation.
* config/tc-arc.c (arcext_section): New variable.
(arc_extinsn): New function.
(md_pseudo_table): Add .extInstruction pseudo op.
(attributes_t): New type.
(suffixclass, syntaxclass, syntaxclassmod): New constant
structures.
(find_opcode_match): Remove arc_num_opcodes.
(md_begin): Likewise.
(tokenize_extinsn): New function.
(arc_set_ext_seg): Likewise.
(create_extinst_section): Likewise.

include/
2016-04-04  Claudiu Zissulescu  <claziss@synopsys.com>

* opcode/arc.h (arc_num_opcodes): Remove.
(ARC_SYNTAX_3OP, ARC_SYNTAX_2OP, ARC_OP1_MUST_BE_IMM)
(ARC_OP1_IMM_IMPLIED, ARC_SUFFIX_NONE, ARC_SUFFIX_COND)
(ARC_SUFFIX_FLAG): Define.
(flags_none, flags_f, flags_cc, flags_ccf): Declare.
(arg_none, arg_32bit_rarbrc, arg_32bit_zarbrc, arg_32bit_rbrbrc)
(arg_32bit_rarbu6, arg_32bit_zarbu6, arg_32bit_rbrbu6)
(arg_32bit_rbrbs12, arg_32bit_ralimmrc, arg_32bit_rarblimm)
(arg_32bit_zalimmrc, arg_32bit_zarblimm, arg_32bit_rbrblimm)
(arg_32bit_ralimmu6, arg_32bit_zalimmu6, arg_32bit_zalimms12)
(arg_32bit_ralimmlimm, arg_32bit_zalimmlimm, arg_32bit_rbrc)
(arg_32bit_zarc, arg_32bit_rbu6, arg_32bit_zau6, arg_32bit_rblimm)
(arg_32bit_zalimm, arg_32bit_limmrc, arg_32bit_limmu6)
(arg_32bit_limms12, arg_32bit_limmlimm): Likewise.

opcodes/
2016-04-04  Claudiu Zissulescu  <claziss@synopsys.com>

* arc-opc.c (flags_none, flags_f, flags_cc, flags_ccf):
Initialize.
(arg_none, arg_32bit_rarbrc, arg_32bit_zarbrc, arg_32bit_rbrbrc)
(arg_32bit_rarbu6, arg_32bit_zarbu6, arg_32bit_rbrbu6)
(arg_32bit_rbrbs12, arg_32bit_ralimmrc, arg_32bit_rarblimm)
(arg_32bit_zalimmrc, arg_32bit_zarblimm, arg_32bit_rbrblimm)
(arg_32bit_ralimmu6, arg_32bit_zalimmu6, arg_32bit_zalimms12)
(arg_32bit_ralimmlimm, arg_32bit_zalimmlimm, arg_32bit_rbrc)
(arg_32bit_zarc, arg_32bit_rbu6, arg_32bit_zau6, arg_32bit_rblimm)
(arg_32bit_zalimm, arg_32bit_limmrc, arg_32bit_limmu6)
(arg_32bit_limms12, arg_32bit_limmlimm): Likewise.
(arc_opcode arc_opcodes): Null terminate the array.
(arc_num_opcodes): Remove.
* arc-ext.h (INSERT_XOP): Define.
(extInstruction_t): Likewise.
(arcExtMap_instName): Delete.
(arcExtMap_insn): New function.
(arcExtMap_genOpcode): Likewise.
* arc-ext.c (ExtInstruction): Remove.
(create_map): Zero initialize instruction fields.
(arcExtMap_instName): Remove.
(arcExtMap_insn): New function.
(dump_ARC_extmap): More info while debuging.
(arcExtMap_genOpcode): New function.
* arc-dis.c (find_format): New function.
(print_insn_arc): Use find_format.
(arc_get_disassembler): Enable dump_ARC_extmap only when
debugging.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>

Remove unneeded AUX register symbols.

gas/
2016-03-31 Claudiu Zissulescu <claziss@synopsys.com>

* config/tc-arc.c (preprocess_operands): Mark AUX symbol.
(arc_adjust_symtab): New function.
* config/tc-arc.h (ARC_FLAG_AUX): Define.
(obj_adjust_symtab): Likewise.
* testsuite/gas/arc/taux.d: New file.
* testsuite/gas/arc/taux.s: Likewise.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>

Properly handle dynamic reloc against normal symbol

We shouldn't issue an error for read-only segment with dynamic IFUNC
relocations when dynamic relocations are against normal symbols.

bfd/

PR ld/19939
* elf-bfd.h (_bfd_elf_allocate_ifunc_dyn_relocs): Add a pointer
to bfd_boolean.
* elf-ifunc.c (_bfd_elf_allocate_ifunc_dyn_relocs): Updated.
Set *readonly_dynrelocs_against_ifunc_p to TRUE if dynamic reloc
applies to read-only section.
* elf32-i386.c (elf_i386_link_hash_table): Add
readonly_dynrelocs_against_ifunc.
(elf_i386_allocate_dynrelocs): Updated.
(elf_i386_size_dynamic_sections): Issue an error for read-only
segment with dynamic IFUNC relocations only if
readonly_dynrelocs_against_ifunc is TRUE.
* elf64-x86-64.c (elf_x86_64_link_hash_table): Add
readonly_dynrelocs_against_ifunc.
(elf_x86_64_allocate_dynrelocs): Updated.
(elf_x86_64_size_dynamic_sections): Issue an error for read-only
segment with dynamic IFUNC relocations only if
readonly_dynrelocs_against_ifunc is TRUE.
* elfnn-aarch64.c (elfNN_aarch64_allocate_ifunc_dynrelocs):
Updated.

ld/

PR ld/19939
* testsuite/ld-i386/i386.exp: Run PR ld/19939 tests.
* testsuite/ld-x86-64/x86-64.exp: Likewise.
* testsuite/ld-i386/pr19939.s: New file.
* testsuite/ld-i386/pr19939a.d: Likewise.
* testsuite/ld-i386/pr19939b.d: Likewise.
* testsuite/ld-x86-64/pr19939.s: Likewise.
* testsuite/ld-x86-64/pr19939a.d: Likewise.
* testsuite/ld-x86-64/pr19939b.d: Likewise.

Automatic date update in version.in

MIPS/opcodes: Fix undecoded MIPS16 extended instruction bit disassembly

Correct the disassembly of hardware don't cares in MIPS16 extended
instructions.  Rather than e.g.:

   0: f008 0231 addiu v0,sp,16433
   4: f520 3260 sll v0,v1,-12

print:

   0: f008 0231 addiu v0,sp,16401
   4: f520 3260 sll v0,v1,20

respectively instead.

opcodes/
* mips-dis.c (print_mips16_insn_arg): Mask unused extended
instruction bits out.

binutils/
* testsuite/binutils-all/mips/mips16-undecoded.d: New test.
* testsuite/binutils-all/mips/mips16-undecoded.s: New test
source.
* testsuite/binutils-all/mips/mips.exp: Run the new test.

Automatic date update in version.in

Fix primary reason why the SH simulation hasn't been working on 64 bit hosts.

sim/sh/
* interp.c (dmul): Split into dmul_s and dmul_u. Use explicit integer
width types and simplify implementation.
* gencode.c (dmuls.l, dmulu.l): Use new functions dmul_s and dmul_u.

Move ChangeLog entries from sim/ChangeLog to sim/sh/ChangeLog.

Automatic date update in version.in

MIPS/GAS: Sanitize `.option picX' pseudo-op

gas/
* config/tc-mips.c (s_option): Sanitize `.option picX'
pseudo-op.
* testsuite/gas/mips/option-pic-1.d: New test.
* testsuite/gas/mips/option-pic-2.l: New list test.
* testsuite/gas/mips/option-pic-1.s: New test source.
* testsuite/gas/mips/option-pic-2.s: New test source.
* testsuite/gas/mips/mips.exp: Run the new tests.

MIPS/GAS: Disallow `.option picX' with VxWorks PIC

gas/
* config/tc-mips.c (s_option): Reject `.option picX' if VxWorks
PIC.
* testsuite/gas/mips/option-pic-vxworks-1.l: New list test.
* testsuite/gas/mips/option-pic-vxworks-2.l: New list test.
* testsuite/gas/mips/option-pic-vxworks-1.s: New test source.
* testsuite/gas/mips/option-pic-vxworks-2.s: New test source.
* testsuite/gas/mips/mips.exp: Run the new tests.

gdb.python/py-mi-events-gdb.py: Add parentheses to print

Required for Python 3

gdb/testsuite/ChangeLog:

* gdb.python/py-mi-events-gdb.py (signal_stop_handler): Add
parentheses to print.
(continue_handler): Likewise.

MIPS/GAS: Correct call formatting in `can_swap_branch_p'

gas/
* config/tc-mips.c (can_swap_branch_p): Correct call formatting.

GAS: Fix a typo in `as_bad' description

gas/
* messages.c (as_bad): Fix a typo in description.

MIPS/GAS: Unify messages in `mips_check_options'

gas/
* config/tc-mips.c (mips_check_options): Unify messages.

MIPS/GAS: Use `opts->isa' consistently in `mips_check_options'

gas/
* config/tc-mips.c (mips_check_options): Use `opts->isa'
consistently.

Adjust default memory size and stack base address for SH simulator.

ld/ChangeLog:
* sh/interp.c (sim_memory_size): Default init to 30.
(parse_and_set_memory_size): Adjust upper bound to 31.

sim/ChangeLog:
* sh/interp.c (sim_memory_size): Default init to 30.
(parse_and_set_memory_size): Adjust upper bound to 31.

Automatic date update in version.in

Make gdb.server/solib-list.exp work for remote targets

There are a few small changes needed to make it work with a real remote
target.

- Remove the [is_remote target] check.
- Remove soname setting when building the lib, it's done by default now
   anyway.
- In the compilation of the executable, pass the shared lib using the
   shlib option, so that RPATH is set.
- Download the program to the target using gdb_remote_download, and
   record the remote path.  Remove loading of the program using
   gdb_load_shlibs, which was not really appropriate anyway.
- Run the remote path through readlink (see comment in the code).
- Start gdbserver with the remote path.

Also, don't set executable and objfile variables, as they are unused.

Tested with native, native-gdbserver, native-extended-gdbserver, and a
remote gdbserver.

gdb/testsuite/ChangeLog:

* gdb.server/solib-list.exp: Remove is_remote check.
Pass shlib= to gdb_compile.  Don't link shared library with
-soname.  Call gdb_remote_download instead of gdb_load_shlibs.
Run binary filename through "readlink -f" on the target.

Fix gdb.server/solib-list.exp regression

Commit 7817ea46148d (Improve gdb_remote_download, remove gdb_download)
caused:

FAIL: gdb.server/solib-list.exp: non-stop 0: target extended-remote (timeout)
FAIL: gdb.server/solib-list.exp: non-stop 0: continue (the program is no longer running)
FAIL: gdb.server/solib-list.exp: non-stop 0: p libvar
FAIL: gdb.server/solib-list.exp: non-stop 1: target extended-remote (timeout)
FAIL: gdb.server/solib-list.exp: non-stop 1: continue (the program is no longer running)
FAIL: gdb.server/solib-list.exp: non-stop 1: p libvar

gdb.log shows:

system interpreter is: /lib64/ld-linux-x86-64.so.2
...
spawn ../gdbserver/gdbserver --once :2347 /home/pedro/brno/pedro/gdb/mygit/build/gdb/testsuite/outputs/gdb.server/solib-list/ld-linux-x86-64.so.2 /home/pedro/brno/pedro/gdb/mygit/build/gdb/testsuite/outputs/gdb.server/solib-list/solib-list
Process /home/pedro/brno/pedro/gdb/mygit/build/gdb/testsuite/outputs/gdb.server/solib-list/ld-linux-x86-64.so.2 created; pid = 18637
Cannot exec /home/pedro/brno/pedro/gdb/mygit/build/gdb/testsuite/outputs/gdb.server/solib-list/ld-linux-x86-64.so.2: No such file or directory.
...

The test copied the interpreter to the outputs directory, however
ld-linux-x86-64.so.2 is a relative symlink that when copied points
nowhere:

$ ls -l testsuite/outputs/gdb.server/solib-list/
total 52
-rwxrwxr-x. 1 pedro pedro 13450 Apr  7 10:52 gdb.log
-rw-rw-r--. 1 pedro pedro  1512 Apr  7 10:52 gdb.sum
lrwxrwxrwx. 1 pedro pedro    10 Apr  7 11:39 ld-linux-x86-64.so.2 -> ld-2.22.so
-rwxrwxr-x. 1 pedro pedro  9464 Apr  7 11:39 solib-list
-rw-rw-r--. 1 pedro pedro  3472 Apr  7 11:39 solib-list-lib.c.o
-rw-rw-r--. 1 pedro pedro  2760 Apr  7 11:39 solib-list.o
-rwxrwxr-x. 1 pedro pedro  9232 Apr  7 11:39 solib-list.so

The copying comes from gdbserver_spawn ->
gdbserver_download_current_prog -> gdb_remote_download.

There's actually no need to download the interpreter to the target -
it's part of the target system/environment.  So fix this by making the
test just not use gdb_load (and gdb_file_cmd as consequence) at all,
and instead pass the interpreter filename to gdbserver as an argument.

gdb/testsuite/ChangeLog:
2016-04-08  Pedro Alves  <palves@redhat.com>

* gdb.server/solib-list.exp: Don't use gdb_load.  Instead pass the
interpreter filename as argument to gdbserver_spawn.
* lib/gdbserver-support.exp (gdbserver_download_current_prog):
Return empty if $last_loaded_file does not exist.

value: Make accessor methods' parameters const-correct

I did a quick pass over value.c and value.h and made some of the accessor methods'
pass-by-reference parameters const-correct. Besides the obvious benefits, this is
required if we want to use them on values that are already declared as const
(such as the parameters to lval_funcs).

There's probably a lot more stuff that can be made const, here and elsewhere.

gdb/ChangeLog:
2016-04-08  Martin Galvan  <martin.galvan@tallertechnologies.com>

    * value.c (value_next): Make pass-by-reference parameters const-correct.
    (value_parent): Likewise.
    (value_enclosing_type): Likewise.
    (value_lazy): Likewise.
    (value_stack): Likewise.
    (value_embedded_offset): Likewise.
    (value_pointed_to_offset): Likewise.
    (value_raw_address): Likewise.
    (deprecated_value_modifiable): Likewise.
    (value_free_to_mark): Likewise.
    (value_release_to_mark): Likewise.
    (internalvar_name): Likewise.
    (readjust_indirect_value_type): Likewise.
    (value_initialized): Likewise.
    * value.h (value_next): Likewise.
    (value_parent): Likewise.
    (value_enclosing_type): Likewise.
    (value_lazy): Likewise.
    (value_stack): Likewise.
    (value_embedded_offset): Likewise.
    (value_pointed_to_offset): Likewise.
    (value_raw_address): Likewise.
    (deprecated_value_modifiable): Likewise.
    (value_free_to_mark): Likewise.
    (value_release_to_mark): Likewise.
    (internalvar_name): Likewise.
    (readjust_indirect_value_type): Likewise.
    (value_initialized): Likewise.

PR18452, ld allows overlapping sections

PR 18452
* ldlang.c (maybe_overlays): Delete.
(lang_size_sections_1): Remove code setting maybe_overlays.
(lang_check_section_addresses): Instead detect overlays by
exact match of section VMAs here. Fix memory leak.

testsuite: Fix for gcc-4.8: gdb.base/jit.exp gdb.base/jit-so.exp

on CentOS-7.2 I get

Running /home/jkratoch/redhat/gdb-test-reg/gdb/testsuite/gdb.base/jit.exp ...
FAIL: gdb.base/jit.exp: one_jit_test-1: continue to breakpoint: break here 2 (the program exited)
FAIL: gdb.base/jit.exp: one_jit_test-2: continue to breakpoint: break here 2 (the program exited)
FAIL: gdb.base/jit.exp: attach: one_jit_test-2: continue to breakpoint: break here 2 (the program exited)
FAIL: gdb.base/jit.exp: attach: one_jit_test-2: break here 2: set var wait_for_gdb = 1
FAIL: gdb.base/jit.exp: attach: one_jit_test-2: break here 2: detach (the program is no longer running)
FAIL: gdb.base/jit.exp: attach: one_jit_test-2: break here 2: attach
FAIL: gdb.base/jit.exp: attach: one_jit_test-2: break here 2: set var wait_for_gdb = 0
FAIL: gdb.base/jit.exp: PIE: one_jit_test-1: continue to breakpoint: break here 2 (the program exited)
Running /home/jkratoch/redhat/gdb-test-reg/gdb/testsuite/gdb.base/jit-so.exp ...
FAIL: gdb.base/jit-so.exp: one_jit_test-1: continue to breakpoint: break here 2 (the program exited)
FAIL: gdb.base/jit-so.exp: one_jit_test-2: continue to breakpoint: break here 2 (the program exited)

since:

85af34ee0211eedf8d30a5c44dfc59dddf8b512a is the first bad commit
commit 85af34ee0211eedf8d30a5c44dfc59dddf8b512a
Author: Pedro Alves <palves@redhat.com>
Date:   Thu Mar 31 19:28:47 2016 +0100
    Add regression test for PR gdb/19858 (JIT code registration on attach)

The compiled code's .debug_line is wrong (for the simplistic approach of GDB
to put a breakpoint on the first address belonging to that source line) and so
GDB misses the breakpoint at the last line:
          WAIT_FOR_GDB; return 0;  /* gdb break here 2  */

Most of the patch is just about reindentation, no changes there.

gdb/testsuite/ChangeLog
2016-04-08  Jan Kratochvil  <jan.kratochvil@redhat.com>

Fix compatibility with gcc-4.8.5-4.el7.x86_64.
* gdb.base/jit-main.c: Use exit after usage.

Fix regexps in PR19910 test to cope with COFF and AOUT sparc targets.

PR target/19910
* testsuite/gas/sparc/pr19910-1.d: Adjust regexps to work with
COFF and AOUT sparc targets.

Show sizes in linker map in target machine address units

* ldlang.c (print_output_section_statement): Show minfo size
in target machine address units.
(print_reloc_statement): Likewise.
(print_padding_statement): Likewise.
(print_data_statement): Likewise. Ensure minimum print_dot
increment of one address unit.

Automatic date update in version.in

testsuite: Fix false FAILs with .bashrc GDBHISTFILE=...

$ GDBHISTFILE=/tmp/gdbhistfile runtest gdb.base/gdbhistsize-history.exp gdb.base/gdbinit-history.exp
Running ./gdb.base/gdbinit-history.exp ...
FAIL: gdb.base/gdbinit-history.exp: home=gdbinit-history/unlimited gdbhistsize=1000: show commands
FAIL: gdb.base/gdbinit-history.exp: home=gdbinit-history/unlimited gdbhistsize=foo: show commands
Running ./gdb.base/gdbhistsize-history.exp ...
FAIL: gdb.base/gdbhistsize-history.exp: histsize=: show commands
FAIL: gdb.base/gdbhistsize-history.exp: histsize=20: show commands
FAIL: gdb.base/gdbhistsize-history.exp: histsize= 20 : show commands
FAIL: gdb.base/gdbhistsize-history.exp: histsize=-5: show commands
FAIL: gdb.base/gdbhistsize-history.exp: histsize=not_an_integer: show commands
FAIL: gdb.base/gdbhistsize-history.exp: histsize=10zab: show commands
FAIL: gdb.base/gdbhistsize-history.exp: histsize=-5ab: show commands
FAIL: gdb.base/gdbhistsize-history.exp: histsize=99999999999999999999999999999999999: show commands
FAIL: gdb.base/gdbhistsize-history.exp: histsize=50: show commands

This happens for my setup due to my:
$ grep GDB ~/.bashrc
export GDBHISTFILE="$HOME/.gdb_history"

gdb/testsuite/ChangeLog
2016-04-07 Jan Kratochvil <jan.kratochvil@redhat.com>

* gdb.base/gdbhistsize-history.exp: Save and unset GDBHISTFILE and
GDBHISTSIZE prior to the tests.
* gdb.base/gdbinit-history.exp: Likewise.

Fix gdb.compile/compile.exp shlib regression

Commit 6e774b13c3b8 (Make ftrace tests work with remote targets) made
a few gdb.compile/compile.exp tests disappear:

-PASS: gdb.compile/compile.exp: call shared library function
-PASS: gdb.compile/compile.exp: expect 1
-PASS: gdb.compile/compile.exp: modify shared library variable
-PASS: gdb.compile/compile.exp: expect 15

This is because the test uses ldflags instead of using the shlib
option, so it misses linking with -rpath, resulting in:

(gdb) run
Starting program: .../compile/compile-shlib
.../compile/compile-shlib: error while loading shared libraries: compile-shlib.so: cannot open shared object file: No such file or directory
[Inferior 1 (process 18014) exited with code 0177]

We were missing a gdb_load_shlibs call, which is needed for remote
testing.

gdb/testsuite/ChangeLog:
2015-04-07 Pedro Alves <palves@redhat.com>

* gdb.compile/compile.exp: Use gdb_compile with "shlib=" option
instead of build_executable. Use gdb_load_shlibs.

arc/nps400: Add new instructions

Add some new control instructions to the opcodes library, and a new test
for these new instructions to the assembler. The new instructions use
an instruction flag longer than any seen before (on arc), and so the max
flag length is extended to accommodate this.

gas/ChangeLog:

* config/tc-arc.h (MAX_FLAG_NAME_LENGTH): Increase to 7.
* testsuite/gas/arc/nps400-2.d: New file.
* testsuite/gas/arc/nps400-2.s: New file.

opcodes/ChangeLog:

* arc-nps400-tbl.h: Add schd, sync, and hwschd instructions.
* arc-opc.c (arc_flag_operands): Add new flags.
(arc_flag_classes): Add new classes.

gas/arc: Handle multiple arc_opcode chains for same mnemonic

This commit completes support for having multiple instructions with the
same mnemonic in non-contiguous blocks within the arc_opcodes table.

The commit adds an iterator mechanism for the arc_opcode_hash_entry
structure, which is then used in find_opcode_match to consider all
arc_opcode entries with the same mnemonic, even when these instructions
are stored in non-contiguous blocks.

I extend the comment on the arc_opcodes table to discuss how entries
within the table are organised, and to mention how instructions can be
split into multiple groups if needed, but that the table is still
searched in table order.

There should be no user visible changes after this commit.

gas/ChangeLog:

* config/tc-arc.c (struct arc_opcode_hash_entry_iterator): New
structure.
(arc_opcode_hash_entry_iterator_init): New function.
(arc_opcode_hash_entry_iterator_next): New function.
(find_opcode_match): Iterate over all arc_opcode entries
referenced by the arc_opcode_hash_entry passed in as a parameter.

opcodes/ChangeLog:

* arc-opc.c (arc_opcodes): Extend comment to discus table layout.

gas/arc: Additional work to support multiple arc_opcode chains

Building on earlier commits, this commit moves along support for having
multiple arc_opcode entries in the arc_opcodes table that have the same
mnemonic (name) field, but are not stored in a contiguous block in the
table.

In this commit we support looking up the arc_opcode_hash_entry from the
hash table, and passing this along to the find_opcode_match function,
which then finds the specific arc_opcode that we're assembling. We
still don't actually support the multiple chains of arc_opcode entries
in this commit, but the limitation is now isolated to the
find_opcode_match function.

There is no user visible change after this commit.

gas/ChangeLog:

* config/tc-arc.c (arc_find_opcode): Now returns
arc_opcode_hash_entry pointer.
(find_opcode_match): Update argument type, extract arc_opcode from
incoming arc_opcode_hash_entry.
(find_special_case_pseudo): Update return type.
(find_special_case_flag): Update return type.
(find_special_case): Update return type.
(assemble_tokens): Lookup arc_opcode_hash_entry based on
instruction mnemonic, then use find_opcode_match to identify
specific arc_opcode.

gas/arc: Modify structure used to hold opcodes

The arc assembler builds a hash table to hold references to arc_opcode
entries in the arc_opcodes table.  This hash assumes that each mnemonic
will always appear in a contiguous blocks within the arc_opcodes table;
all ADD instruction will be together, all AND instructions will likewise
be together and so on.

The problem with this is that as different variations of arc are added,
then it is often more convenient to split instructions apart, so all the
base ADD instructions are together, but, variants of ADD specific to one
variation of arc are grouped with other instructions specific to that
arc variant.  The current data structures don't support splitting the
instructions in this way.

This commit is a first step towards addressing this limitation.  In this
commit the hash table that currently holds arc_opcode pointers directly,
instead holds a pointer to a new, intermediate, data structure.  This
new data structure holds the pointer to the arc_opcode.  In this way, we
can, in the future support having the intermediate structure hold
multiple pointers to different arc_opcode groups.

There should be no visible functional change after this commit.

gas/ChangeLog:

* config/tc-arc.c (struct arc_opcode_hash_entry): New structure.
(arc_find_opcode): New function.
(find_special_case_pseudo): Use arc_find_opcode.
(find_special_case_flag): Likewise.
(assemble_tokens): Likewise.
(md_begin): Build hash using struct arc_opcode_hash_entry.

Fix gdb.reverse/finish-reverse-bkpt.exp

I see the following fail on aarch64-linux

break void_func
Breakpoint 2 at 0x4007a0: file gdb/testsuite/gdb.reverse/finish-reverse.c, line 44.
(gdb) PASS: gdb.reverse/finish-reverse-bkpt.exp: set breakpoint on void_func
continue
Continuing.

Breakpoint 2, void_func () at gdb/testsuite/gdb.reverse/finish-reverse.c:44^M
44        void_test = 1;                /* VOID FUNC */^M
(gdb) PASS: gdb.reverse/finish-reverse-bkpt.exp: continue to breakpoint: void_func
break *void_func^M
Note: breakpoint 2 also set at pc 0x4007a0.^M
Breakpoint 3 at 0x4007a0: file gdb/testsuite/gdb.reverse/finish-reverse.c, line 44.
(gdb) PASS: gdb.reverse/finish-reverse-bkpt.exp: set breakpoint at void_func's entry
reverse-finish^M
Run back to call of #0  void_func () at gdb/testsuite/gdb.reverse/finish-reverse.c:44
main (argc=1, argv=0x7ffffffb78) at gdb/testsuite/gdb.reverse/finish-reverse.c:98
98        void_func ();                                 /* call to void_func */^M
(gdb) FAIL: gdb.reverse/finish-reverse-bkpt.exp: reverse-finish from void_func trips breakpoint at entry

The test assumes that brekapoints on "void_func" and "*void_func" are
set on different places because of function prologue.  However, on
aarch64-linux, there is no prologue in void_func, so two breakpoints
are set at the same place (0x4007a0).

(gdb) disassemble void_func
Dump of assembler code for function void_func:
   0x00000000004007a0 <+0>: adrp x0, 0x410000
   0x00000000004007a4 <+4>: add x0, x0, #0xc14
   0x00000000004007a8 <+8>: mov w1, #0x1
   0x00000000004007ac <+12>: str w1, [x0]
   0x00000000004007b0 <+16>: ret

The fix to this problem is to single step forward before setting
breakpoint on *void_func.

gdb/testsuite:

2016-04-07  Yao Qi  <yao.qi@linaro.org>

* gdb.reverse/finish-reverse-bkpt.exp: Use temporary breakpoint.
Execute "si" command.

Fix gdb.reverse/next-reverse-bkpt-over-sr.exp

I see the fail on aarch64-linux,

(gdb) reverse-next

Breakpoint 2, callee () at /home/yao/SourceCode/gnu/gdb/git/gdb/testsuite/gdb.reverse/step-reverse.c:26^M
26        myglob++; return 0;   /* ARRIVED IN CALLEE */
(gdb) FAIL: gdb.reverse/next-reverse-bkpt-over-sr.exp: reverse-next over call trips user breakpoint at function entry

The test expects program stops at line 25, but program stops at line 26.

(gdb) maintenance info line-table
objfile: /scratch/yao/gdb/build-git/aarch64-linux-gnu/gdb/testsuite/outputs/gdb.reverse/next-reverse-bkpt-over-sr/next-reverse-bkpt-over-sr ((struct objfile *) 0x613000002880)
compunit_symtab: ((struct compunit_symtab *) 0x621000121760)
symtab: /home/yao/SourceCode/gnu/gdb/git/gdb/testsuite/gdb.reverse/step-reverse.c ((struct symtab *) 0x6210001217e0)
linetable: ((struct linetable *) 0x6210001520d0):
INDEX    LINE ADDRESS
0          25 0x0000000000400890
1          26 0x0000000000400890
2          27 0x00000000004008b0

(gdb) disassemble callee
Dump of assembler code for function callee:
   0x0000000000400890 <+0>:     adrp    x0, 0x410000
   0x0000000000400894 <+4>:     add     x0, x0, #0xcac

the line-table show that the first instruction of function callee is
mapped line 25 and 26.  I am not sure the line-table is correct, but
it is not the point of this test.  The goal of this test is to test
program hits the breakpoint on the first instruction of function after
'reverse-next', so I change this test to expect the breakpoint number
the program hits.

gdb/testsuite:

2016-04-07  Yao Qi  <yao.qi@linaro.org>

* gdb.reverse/next-reverse-bkpt-over-sr.exp: Match the breakpoint
number instead of the comments on some line.

Make breakpoint handling in record-full idempotent

Some test fails in gdb.reverse/break-reverse.exp on arm-linux lead me
seeing the following error message,

continue^M
Continuing.^M
Cannot remove breakpoints because program is no longer writable.^M
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Further execution is probably impossible.^M
^M
Breakpoint 3, bar () at /home/yao/SourceCode/gnu/gdb/git/gdb/testsuite/gdb.reverse/break-reverse.c:22^M
22        xyz = 2; /* break in bar */^M
(gdb) PASS: gdb.reverse/break-reverse.exp: continue to breakpoint: bar backward

this is caused by two entries in record_full_breakpoints, and their addr
is the same, but in_target_beneath is different.

during the record, we do continue,

Continuing.
infrun: clear_proceed_status_thread (Thread 13772.13772)
infrun: proceed (addr=0xffffffff, signal=GDB_SIGNAL_DEFAULT)
infrun: step-over queue now empty
infrun: resuming [Thread 13772.13772] for step-over
infrun: skipping breakpoint: stepping past insn at: 0x8620
Sending packet: $Z0,85f4,4#1d...Packet received: OK  <----
.....
Sending packet: $vCont;c#a8...infrun: target_wait (-1.0.0, status) =
infrun:   -1.0.0 [process -1],
infrun:   status->kind = ignore
infrun: TARGET_WAITKIND_IGNORE
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun:   -1.0.0 [process -1],
infrun:   status->kind = ignore
infrun: TARGET_WAITKIND_IGNORE
infrun: prepare_to_wait
Packet received: T05swbreak:;0b:9cf5ffbe;0d:9cf5ffbe;0f:f4850000;thread:p35cc.35cc;core:1;
Sending packet: $Z0,85f4,4#1d...Packet received: OK <-----
....
Sending packet: $z0,85f4,4#3d...Packet received: OK <-----

we can see breakpoint on 0x85f4 are inserted *twice*, but only removed
once.  That is fine to remote target, because Z/z packets are
idempotent, but there is a leftover in record_full_breakpoints
in record-full target.  The flow can be described as below,

                                record_full_breakpoints   remote target
  -----------------------------------------------------------------------
  forward execution, continue,    in_target_beneath 1     breakpoint inserted
  insert breakpoints on 0x85f4    in_target_beneath 1
  twice

  program stops,
  remove breakpoint on 0x85f4     in_target_beneath 1     breakpoint removed

  reverse execution, continue,    in_target_beneath 1     none is requested
  insert breakpoints on 0x85f4,   in_target_beneath 0

  program stops,
  remote breakpoint on 0x85f4,    in_target_beneath 0     request to remove,
                                                          but GDBserver
  doesn't know

now, the question is why breakoint on 0x85f4 is inserted twice?  One
is the normal breakpoint, and the other is the single step breakpoint.
GDB inserts single step breakpoint to do single step.  When program
stops at 0x85f4, both of them are set on 0x85f4, and GDB deletes
single step breakpoint, so in update_global_location_list, this
breakpoint location is no longer found, GDB call
force_breakpoint_reinsertion to mark it condition_updated, and insert
it again.

The reason force_breakpoint_reinsertion is called to update the
conditions in the target side, because the conditions may be
changed.  My original fix is to not call force_breakpoint_reinsertion
if OLD_LOC->cond is NULL, but it is not correct if another location
on the same address has condition, GDB doesn't produce condition for
target side, but GDB should do.

Then, I change my mind back to make record-full handling breakpoint
idempotent, to align with remote target.  Before insert a new entry
into record_full_breakpoints, look for existing one on the same
address first.  I also add an assert on
"bp->in_target_beneath == in_target_beneath", to be safer.

gdb:

2016-04-07  Yao Qi  <yao.qi@linaro.org>

* record-full.c (record_full_insert_breakpoint): Return
early if entry on the address is found in
record_full_breakpoints.

Set bp_tgt->reqstd_address and bp_tgt->placed_size in record_full_insert_breakpoint

I notice that bp_tgt won't be fully initialized if to_insert_breakpoint
isn't called in record_full_insert_breakpoint, and bp_tgt->reqstd_address
is zero, so an entry is added to record_full_breakpoints, but its address
is zero, which is wrong. This patch is to call gdbarch_breakpoint_from_pc
in the else branch to set bp_tgt->reqstd_address and bp_tgt->placed_size.

gdb:

2016-04-07 Yao Qi <yao.qi@linaro.org>

* record-full.c (record_full_insert_breakpoint): Set
bp_tgt->reqstd_address and bp_tgt->placed_size.

ld/arc: Make little endian default choice for linker scripts

When building with --enable-targets=all the target string is not set to
something that matches the pattern arc*-*, and so the script used to
decide if we should build big or little endian linker script currently
exits with an error.

This commit makes little endian linker script be the default, which will
be used when building for all targets, this matches the behaviour from
before I made the endianness switchable, when we only ever built little
endian linker scripts anyway.

ld/ChangeLog:

* emulparams/arc-endianness.sh: Make little endian default choice.

Fix gas/ChangeLog

[ARC] Prepare strings for automatic translation.

gas/
2016-04-07 Claudiu Zissulescu <claziss@synopsys.com>

* config/tc-arc.c (arc_option): Prepare string for automatic
translation.
(declare_register): Likewise.

Update AArch64 documentation regarding architecture extensions.

* doc/c-aarch64.texi (Architecture Extensions): Add entry for LSE.
Correct entry for RDMA. Alpha sort entries.

gas/arc: Allow greater range of characters into flag names

An upcoming commit will add a new arc instruction flag that uses
characters that have never appeared in an arc instruction flag before.
Currently the assembler is very conservative about which characters can
or cannot appear in an instruction flag.

This commit relaxes these constraints a little. After this commit all
alpha-numeric characters are now allowed into instruction flags. This
complete set is not required for the upcoming change, however, having
this slightly larger set does not impact the assemblers ability to
correctly parse input, but does make it easier to add new flag to the
instruction table.

gas/ChangeLog:

* config/tc-arc.c (tokenize_flags): Allow greater range of
characters into flag names.

gas/arc: Remove preprocess_operands function

The preprocess_operands function changes the incoming list of assembler
tokens based on the assumption that the first arc_operand found will be
the same instruction class as all of the arc_operands for the same
mnemonic.

Though this assumption is probably fine, removing this assumption, and
pushing the token change down into assemble_tokens makes the code no
more complex, and might even be easier to follow.

There should be no user visible changes after this commit.

gas/ChangeLog:

* config/tc-arc.c (find_opcode_match): Handle O_symbol case, add
new de_fault label.
(preprocess_operands): Delete.
(assemble_tokens): Remove call to preprocess_operands.

Allow integer contants to have a U suffix. Improve error reporting for missing closing parentheses.

PR gas/19910
* config/tc-sparc.c (sparc_ip): Report an error if the expression
inside a %-macro could not be fully parsed.
* expr.c (integer_constant): Accept and ignore U suffixes to
integers.
(operand): When a missing closing parenthesis is encountered,
report the character that was found instead.
* testsuite/gas/mips/tls-ill.l: Update expected error message.
* testsuite/gas/sparc/pr19910-1.d: New test driver.
* testsuite/gas/sparc/pr19910-1.s: New test.
* testsuite/gas/sparc/pr19910-2.l: Expected error output.
* testsuite/gas/sparc/pr19910-2.s: New test.
* testsuite/gas/sparc/sparc.exp: Run the new tests.

Fix typo in name of MSP430 attribute section.

Automatic date update in version.in

Eliminate -var-create error for optzd ptr to struct

This patch eliminates an error thrown when accessing the value of a
pointer to a structure where the pointer has been optimized out and
'set print object' is 'on'.  The error shows up as the rather ugly
value of the pointer variable in Eclipse.

If 'set print object' is 'on', GDB tries to determine the actual
(derived) type of the object rather than the declared type, which
requires dereferencing the pointer, which in this cases throws an
error because the pointer has been optimized out.

The fix is to simply ignore the 'print object on' setting for
pointers or references to structures when they have been optimized
out.  This means we just get the declared type instead of the actual
type, because in this case that's the best that we can do.

To implement the fix, value_optimized_out was modified so that it
no longer throws an error when it fails to fetch the specified
value.  Instead, it just checks value->optimized_out.  If we can't
definitively say that the value is optimized out, then we assume
it is not.

gdb/ChangeLog:
2016-04-06  Don Breazeal  <donb@codesourcery.com>

* value.c (value_actual_type): Don't try to get rtti type
of the value if it has been optimized out.
(value_optimized_out): If a memory access error occurs,
just check vaue->optimized_out.

Optimized-out pointer: New test for error handling

This patch implements a test that ensures that with "set print object
on", -var-create returns "<optimized out>" for an optimized out pointer
to structure, rather than throwing an error, while also ensuring that
any attempt to dereference the pointer *will* throw an error.

It uses the dwarf assembler to construct the appropriate debug info
to represent a pointer-to-struct in the program as optimized out,
and then accesses that pointer in various ways. The test uses both
the console interpreter and the MI interpreter.

gdb/testsuite/ChangeLog:
2016-04-06 Don Breazeal <donb@codesourcery.com>

* gdb.dwarf2/dw2-opt-structptr.c: New test program.
* gdb.dwarf2/dw2-opt-structptr.exp: New test script.