... not when a new GDB connection sends the status packet ('?').
Mainly just a cleanup/simplification, as GDB always sends '?' first.
Tested on x86_64 Fedora 17.
2014-01-08 Pedro Alves <palves@redhat.com>
* server.c (handle_status): Don't discard previous queued stop
replies or thread's pending status here.
(main) <disconnection>: Do it here instead.
Currently, when GDB connects in all-stop mode, GDBserver always
responds to the status packet with a GDB_SIGNAL_TRAP, even if the
program is actually stopped for some other signal.
(gdb) tar rem ...
...
(gdb) c
Program received signal SIGUSR1, User defined signal 1.
(gdb) disconnect
(gdb) tar rem ...
(gdb) c
(Or a GDB crash instead of an explicit disconnect.)
This results in the program losing that signal on that last continue,
because gdb will tell the target to resume with no signal (to suppress
the GDB_SIGNAL_TRAP, due to 'handle SISGTRAP nopass'), and that will
actually suppress the real signal the program had stopped for
(SIGUSR1). To fix that, I think we should make GDBserver report the
real signal the thread had stopped for in response to the status
packet:
@item ?
@cindex @samp{?} packet
Indicate the reason the target halted. The reply is the same as for
step and continue.
But, that raises the question -- which thread are we reporting the
status for? Due to how the RSP in all-stop works, we can only report
one status. The status packet's response is a stop reply packet, so
it includes the thread identifier, so it's not a problem packet-wise.
However, GDBserver is currently always reporting the status for first
thread in the thread list, even though that may well not be the thread
that got the signal that caused the program to stop. So the next
logical step would be to report the status for the
last_ptid/last_status thread (the last event reported to gdb), if it's
still around; and if not, fallback to some other thread.
There's an issue on the GDB side with that, though...
GDB currently always adds the thread reported in response to the
status query as the first thread in its list. That means that if we
start with e.g.,
(gdb) info threads
3 Thread 1003 ...
* 2 Thread 1002 ...
1 Thread 1001 ...
And reconnect:
(gdb) disconnect
(gdb) tar rem ...
We end up with:
(gdb) info threads
3 Thread 1003 ...
2 Thread 1001 ...
* 1 Thread 1002 ...
Not a real big issue, but it's reasonably fixable, by having GDB
fetch/sync the thread list before fetching the status/'?', and then
using the status to select the right thread as current on the GDB
side. Holes in the thread numbers are squashed before/after
reconnection (e.g., 2,3,5 becomes 1,2,3), but the order is preserved,
which I think is both good, and good enough.
However (yes, there's more...), the previous GDB that was connected
might have had gdbserver running in non-stop mode, or could have left
gdbserver doing disconnected tracing (which also forces non-stop), and
if the new gdb/connection is in all-stop mode, we can end up with more
than one thread with a signal to report back to gdb. As we can only
report one thread/status (in the all-stop RSP variant; the non-stop
variant doesn't have this issue), we get to do what we do at every
other place we have this situation -- leave events we can't report
right now as pending, so that the next resume picks them up.
Note all this ammounts to a QoI change, within the existing framework.
There's really no RSP change here.
The only user visible change (other than that the signal is program is
stopped at isn't lost / is passed to the program), is in "info
program", that now can show the signal the program stopped for. Of
course, the next resume will respect the pass/nopass setting for the
signal in question. It'd be reasonable to have the initial connection
tell the user the program was stopped with a signal, similar to when
we load a core to debug, but I'm leaving that out for a future change.
I think we'll need to either change how handle_inferior_event & co
handle stop_soon, or maybe bypass them completely (like
fork-child.c:startup_inferior) for that.
Tested on x86_64 Fedora 17.
gdb/gdbserver/
2014-01-08 Pedro Alves <palves@redhat.com>
* gdbthread.h (struct thread_info) <status_pending_p>: New field.
* server.c (visit_actioned_threads, handle_pending_status): New
function.
(handle_v_cont): Factor out parts to ...
(resume): ... this new function. If in all-stop, and a thread
being resumed has a pending status, report it without actually
resuming.
(myresume): Adjust to use the new 'resume' function.
(clear_pending_status_callback, set_pending_status_callback)
(find_status_pending_thread_callback): New functions.
(handle_status): Handle the case of multiple threads having
interesting statuses to report. Report threads' real last signal
instead of always reporting GDB_SIGNAL_TRAP. Look for a thread
with an interesting thread to report the status for, instead of
always reporting the status of the first thread.
gdb/
2014-01-08 Pedro Alves <palves@redhat.com>
* remote.c (remote_add_thread): Add threads silently if starting
up.
(remote_notice_new_inferior): If in all-stop, and starting up,
don't call notice_new_inferior.
(get_current_thread): New function, factored out from ...
(add_current_inferior_and_thread): ... this. Adjust.
(remote_start_remote) <all-stop>: Fetch the thread list. If we
found any thread, then select the remote's current thread as GDB's
current thread too.
gdb/testsuite/
2014-01-08 Pedro Alves <palves@redhat.com>
* gdb.threads/reconnect-signal.c: New file.
* gdb.threads/reconnect-signal.exp: New file.
gdb/ChangeLog:
* top.c (print_gdb_version): Set copyright year to 2014.
gdb/gdbserver/ChangeLog:
* gdbserver.c (gdbserver_version): Set copyright year to 2014.
* gdbreplay.c (gdbreplay_version): Likewise.
* aarch64-linux-nat.c (aarch64_linux_set_debug_regs): Set
iov.iov_len with the real length in use.
gdb/gdbserver/
* linux-aarch64-low.c (aarch64_linux_set_debug_regs): Set
iov.iov_len with the real length in use.
This is the gdbserver-equivalent of the change made in GDB to handle
the case, in x64 windows version 2012, where the kernel produces
a LOAD_DLL_DEBUG_EVENT where the name of the associated DLL cannot
be determined at that time, and thus has to be processed later.
The visible symptom is that ntdll.dll is missing from the list of
shared libraries known to be mapped by the inferior, with other
side-effects such as failure to unwind through code provided by
that DLL (such as exception handling routines).
gdb/gdbserver/ChangeLog:
* Makefile.in (safe-ctype.o, lbasename.o): New rules.
* configure.srv: Add safe-ctype.o and lbasename.o to srv_tgtobj
for all targets that use win32-low.c.
* win32-low.c (win32_ensure_ntdll_loaded): New function.
(do_initial_child_stuff): Add call to win32_ensure_ntdll_loaded.
This is a preparatory patch that achieves two goals:
. Makes the initial event handling more similar to GDB's;
. Opens the door for implementing post-inititial-handling
operations.
At the moment, this is only done on Windows, where the
post-initial-handling is going to be needed (in the context of
Windows 2012). And because we're close to creating the gdb 7.7
branch, making that change for all platforms is a little more
risk that we'd like. So the change is currently implemented
on Windows.
gdb/gdbserver/ChangeLog:
* target.c (mywait): Set OURSTATUS->KIND to TARGET_WAITKIND_STOPPED
if equal to TARGET_WAITKIND_LOADED.
* win32-low.c (cached_status): New static global.
(win32_wait): Add declaration.
(do_initial_child_stuff): Flush all initial pending debug events
up to the initial breakpoint.
(win32_wait): If CACHED_STATUS was set, return that instead
of doing a real wait. Remove the code resuming the execution
of the inferior after receiving a TARGET_WAITKIND_LOADED event
during the initial phase. Also remove the code changing
OURSTATUS->KIND from TARGET_WAITKIND_LOADED to
TARGET_WAITKIND_STOPPED.
Due to copy-n-paste, the problem caused PR remote/15974 also exists
in gdbserver. This patch fixes it in the same way. Patch to fix
remote/15974 can be found:
https://sourceware.org/ml/gdb-patches/2013-12/msg00014.html
gdb/gdbserver:
2013-12-11 Yao Qi <yao@codesourcery.com>
* notif.c (handle_notif_ack): Return 0 if no notification
matches.
This patch is purely mechanical. It removes gdb_stat.h and changes
the code to use sys/stat.h.
2013-11-18 Tom Tromey <tromey@redhat.com>
* common/gdb_stat.h: Remove.
* ada-lang.c: Use sys/stat.h, not gdb_stat.h.
* common/filestuff.c: Use sys/stat.h, not gdb_stat.h.
* common/linux-osdata.c: Use sys/stat.h, not gdb_stat.h.
* corefile.c: Use sys/stat.h, not gdb_stat.h.
* ctf.c: Use sys/stat.h, not gdb_stat.h.
* darwin-nat.c: Use sys/stat.h, not gdb_stat.h.
* dbxread.c: Use sys/stat.h, not gdb_stat.h.
* dwarf2read.c: Use sys/stat.h, not gdb_stat.h.
* exec.c: Use sys/stat.h, not gdb_stat.h.
* gdbserver/linux-low.c: Use sys/stat.h, not gdb_stat.h.
* gdbserver/remote-utils.c: Use sys/stat.h, not gdb_stat.h.
* inf-child.c: Use sys/stat.h, not gdb_stat.h.
* jit.c: Use sys/stat.h, not gdb_stat.h.
* linux-nat.c: Use sys/stat.h, not gdb_stat.h.
* m68klinux-nat.c: Use sys/stat.h, not gdb_stat.h.
* main.c: Use sys/stat.h, not gdb_stat.h.
* mdebugread.c: Use sys/stat.h, not gdb_stat.h.
* mi/mi-cmd-env.c: Use sys/stat.h, not gdb_stat.h.
* nto-tdep.c: Use sys/stat.h, not gdb_stat.h.
* objfiles.c: Use sys/stat.h, not gdb_stat.h.
* procfs.c: Use sys/stat.h, not gdb_stat.h.
* remote-fileio.c: Use sys/stat.h, not gdb_stat.h.
* remote-mips.c: Use sys/stat.h, not gdb_stat.h.
* remote.c: Use sys/stat.h, not gdb_stat.h.
* rs6000-nat.c: Use sys/stat.h, not gdb_stat.h.
* sol-thread.c: Use sys/stat.h, not gdb_stat.h.
* solib-spu.c: Use sys/stat.h, not gdb_stat.h.
* source.c: Use sys/stat.h, not gdb_stat.h.
* symfile.c: Use sys/stat.h, not gdb_stat.h.
* symmisc.c: Use sys/stat.h, not gdb_stat.h.
* symtab.c: Use sys/stat.h, not gdb_stat.h.
* top.c: Use sys/stat.h, not gdb_stat.h.
* xcoffread.c: Use sys/stat.h, not gdb_stat.h.
stdlib.h is universal as well, so there is no need to check for it.
2013-11-18 Tom Tromey <tromey@redhat.com>
* configure: Rebuild.
* configure.ac: Don't check for stdlib.h
* defs.h: Include stdlib.h unconditionally.
2013-11-18 Tom Tromey <tromey@redhat.com>
* configure: Rebuild.
* configure.ac: Don't check for stdlib.h.
* gdbreplay.c: Unconditionally include stdlib.h.
This removes gdb_dirent.h and updates the code to use dirent.h
instead. It also removes the now-useless configure checks.
2013-11-18 Tom Tromey <tromey@redhat.com>
* common/common.m4 (GDB_AC_COMMON): Don't use AC_HEADER_DIRENT.
* common/gdb_dirent.h: Remove.
* common/filestuff.c: Use dirent.h.
* common/linux-osdata.c: Use dirent.h.
(NAMELEN): Define.
* config.in: Rebuild.
* configure: Rebuild.
* configure.ac: Don't use AC_HEADER_DIRENT.
* linux-fork.c: Use dirent.h
* linux-nat.c: Use dirent.h.
* nto-procfs.c: Use dirent.h.
* procfs.c: Use dirent.h.
2013-11-18 Tom Tromey <tromey@redhat.com>
* config.in: Rebuild.
* configure: Rebuild.
* configure.ac: Don't use AC_HEADER_DIRENT.
Now that we are using the gnulib string.h module, we don't need to
check for string.h or strings.h. This removes the last few checks
from the source and from the configure scripts.
2013-11-18 Tom Tromey <tromey@redhat.com>
* configure: Rebuild.
* common/common.m4 (GDB_AC_COMMON): Don't check for string.h or
strings.h.
2013-11-18 Tom Tromey <tromey@redhat.com>
* server.h: Don't check HAVE_STRING_H.
* gdbreplay.c: Don't check HAVE_STRING_H.
* configure: Rebuild.
Later patches in this series will make changes to gdb and gdbserver
configury, necessitating the use of gnulib in gdbreplay. This patch
introduces the dependency early, so that subsequent patches don't
break the build.
2013-11-18 Tom Tromey <tromey@redhat.com>
* Makefile.in (gdbreplay$(EXEEXT)): Depend on and link against
LIBGNU.
It has bothered me for a while that files in common/ use macros
defined via autoconf checks, but rely on each configure.ac doing the
proper checks independently.
This patch introduces common/common.m4 which consolidates the checks
assumed by code in common.
The rule I propose is that if something is needed or used by common,
it should be checked for by common.m4. However, if the check is also
needed by gdb or gdbserver, then it should be duplicated there.
Built and regtested on x86-64 Fedora 18 (though this is hardly the
most strenuous case) and using the Fedora 18 mingw cross compilers. I
also examined the config.in diffs to ensure that symbols did not go
missing.
2013-11-08 Tom Tromey <tromey@redhat.com>
* acinclude.m4: Include common.m4.
* common/common.m4: New file.
* configure, config.in: Rebuild.
* configure.ac: Use GDB_AC_COMMON.
2013-11-08 Tom Tromey <tromey@redhat.com>
* acinclude.m4: Include common.m4, codeset.m4.
* configure, config.in: Rebuild.
* configure.ac: Use GDB_AC_COMMON.
When checking for the presence of the TDB regset, the current code
interprets ENODATA from PTRACE_GETREGSET as an indication that the TDB
regset *could* occur on this system, but the inferior stopped outside
a transaction. However, the Linux kernel actually reports ENODATA
even on systems without the transactional execution facility. Thus
the logic is now changed to check the TE field in the HWCAP as well.
This version also checks the existence of the TDB regset -- just to be
on the safe side when running on TE-enabled hardware with a kernel
that does not offer the TDB regset for some reason.
gdb/
* s390-linux-nat.c (s390_read_description): Consider the TE field
in the HWCAP for determining 'have_regset_tdb'.
gdbserver/
* linux-s390-low.c (HWCAP_S390_TE): New define.
(s390_arch_setup): Consider the TE field in the HWCAP for
determining 'have_regset_tdb'.
The first one, dw2_get_real_path from gdb/dwarf2read.c, was actually
making use of OBSTACK_CALLOC which already calls "sizeof" for its third
argument.
The second, download_tracepoint_1 from gdb/gdbserver/tracepoint.c, was
explicitly calling "sizeof" inside another "sizeof".
This patch fixed both functions.
gdb/ChangeLog
2013-10-16 Sergio Durigan Junior <sergiodj@redhat.com>
PR gdb/16014
* dwarf2read.c (dw2_get_real_path): Remove unnecessary call to
sizeof.
gdb/gdbserver/ChangeLog
2013-10-16 Sergio Durigan Junior <sergiodj@redhat.com>
PR gdb/16014
* tracepoint.c (download_tracepoint_1): Remove unnecessary double
call to sizeof.
If we make gdbserver gdb_continue_to_end actually expect a process
exit with GDBserver, we get many testsuite failures with the remote
stdio board:
-PASS: gdb.arch/amd64-disp-step.exp: continue until exit at amd64-disp-step
+FAIL: gdb.arch/amd64-disp-step.exp: continue until exit at amd64-disp-step (the program exited)
-PASS: gdb.base/break.exp: continue until exit at recursive next test
+FAIL: gdb.base/break.exp: continue until exit at recursive next test (the program exited)
-PASS: gdb.base/chng-syms.exp: continue until exit at breakpoint first time through
+FAIL: gdb.base/chng-syms.exp: continue until exit at breakpoint first time through (the program exited)
... etc. ...
This is what the log shows for all of them:
(gdb) continue
Continuing.
Child exited with status 0
GDBserver exiting
[Inferior 1 (process 22721) exited normally]
(gdb) FAIL: gdb.arch/amd64-disp-step.exp: continue until exit (the program exited)
The problem is the whole "Child exited ... GDBserver exiting" output,
that comes out of GDBserver, and that the testsuite is not expecting.
I pondered somehow making the testsuite adjust to this. But,
testsuite aside, I think GDBserver should not be outputting this at
all when GDB is connected through stdio. GDBserver will be printing
this in GDB's console, but the user can already tell from the regular
output that the inferior is gone.
Again, manually:
(gdb) tar remote | ./gdbserver/gdbserver - program
Remote debugging using | ./gdbserver/gdbserver - program
Process program created; pid = 22486
stdin/stdout redirected
Remote debugging using stdio
done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
0x000000323d001530 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb) c
Continuing.
Child exited with status 1
^^^^^^^^^^^^^^^^^^^^^^^^^^
GDBserver exiting
^^^^^^^^^^^^^^^^^
[Inferior 1 (process 22486) exited with code 01]
(gdb)
Suppressing those two lines makes the output be exactly like when
debugging against a remote tcp gdbserver:
(gdb) c
Continuing.
[Inferior 1 (process 22914) exited with code 01]
(gdb)
2013-10-02 Pedro Alves <palves@redhat.com>
* server.c (process_serial_event): Don't output "GDBserver
exiting" if GDB is connected through stdio.
* target.c (mywait): Likewise, be silent if GDB is connected
through stdio.
The current implementation is forgetting to populate the thread list
when attaching to the process. This results in an incomplete list of
threads when debugging a threaded program.
Unfortunately, as the added comments hints, there appears to be
no way of getting the list of threads via ptrace, other than by
spawning the "ps" command, and parsing its output. Not great,
but it appears to be the best we can do.
gdb/gdbserver/ChangeLog:
* lynx-low.c (lynx_add_threads_after_attach): New function.
(lynx_attach): Remove call to add_thread. Add call to
lynx_add_threads_after_attach instead.
It is possible to have a build of glibc where SYS_perf_event_open is not
defined (because when the glibc was compiled, the syscall did not exist),
but have newer kernel headers installed so that linux/perf_event.h is
available. In this setup, you get a build failure:
./common/linux-btrace.c: In function 'kernel_supports_btrace':
./common/linux-btrace.c:316:23: error: 'SYS_perf_event_open' undeclared (first use in this function)
Update the ifdef check to also see if the syscall is available.
URL: https://bugs.gentoo.org/473522
Reported-by: William Throwe <wtt6@cornell.edu>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Apply the same fix that was applied to aarch64-linux-nat.c.
2013-09-16 Will Newton <will.newton@linaro.org>
* linux-aarch64-low.c (aarch64_linux_set_debug_regs): Zero
out regs.
These two are still written in the pre-auto-dependency-tracking style.
They probably were written before that, and committed afterwards
without adjustment. An easy oversight to make.
gdb/gdbserver/
2013-09-06 Pedro Alves <palves@redhat.com>
* Makefile.in (linux-btrace.o, mips-linux-watch.o): Remove
explicit header dependencies and use $COMPILE/$POSTCOMPILE.
Somehow, my builds yesterdays didn't trip on this...
../src/gdb/gdbserver/linux-amd64-ipa.c: In function ‘initialize_low_tracepoint’:
../src/gdb/gdbserver/linux-amd64-ipa.c:172:3: error: ‘ipa_tdesc’ undeclared (first use in this function)
../src/gdb/gdbserver/linux-amd64-ipa.c:172:3: note: each undeclared identifier is reported only once for each function it appears in
gdb/gdbserver/
2013-09-06 Pedro Alves <palves@redhat.com>
* linux-amd64-ipa.c: Include tracepoint.h.
* linux-i386-ipa.c: Include tracepoint.h.
One misspelled function call, and one superfluous typedef. The latter
causes an error of the following type when building:
linux-crisv32-low.c:372: error: conflicting types for 'elf_gregset_t'
/.../target/include/asm/elf.h:36:
error: previous declaration of 'elf_gregset_t' was here
2013-09-06 Ricard Wanderlof <ricardw@axis.com>
* linux-crisv32-low.c (elf_gregset_t): Delete typedef.
(initialize_low_arch): Call init_registers_crisv32 rather than
init_register_crisv32.
gdb/gdbserver/
2013-09-05 Pedro Alves <palves@redhat.com>
* server.h (gdb_client_data, handler_func, callback_handler_func)
(delete_file_handler, add_file_handler, append_callback_event)
(delete_callback_event, start_event_loop, initialize_event_loop):
Move to event-loop.h and include it.
* event-loop.h: New file.
gdb/gdbserver/
2013-09-05 Pedro Alves <palves@redhat.com>
* server.h (perror_with_name, error, fatal, warning, paddress)
(pulongest, plongest, phex_nz, pfildes): Move to utils.h, and
include it.
* utils.h: New file.
server.h nowadays includes gdb_locale.h, which already brings this in.
gdb/gdbserver/
2013-09-05 Pedro Alves <palves@redhat.com>
* server.h (_): Delete.
I'm seeing trace-buffer-size.exp failing (with gdbserver):
(gdb) PASS: gdb.trace/trace-buffer-size.exp: tstatus check 2
show trace-buffer-size 4
Requested size of trace buffer is 4.
(gdb) PASS: gdb.trace/trace-buffer-size.exp: show trace buffer size
set trace-buffer-size -1
memory clobbered past end of allocated block
Remote connection closed
(gdb) FAIL: gdb.trace/trace-buffer-size.exp: set trace buffer size 2
set trace-buffer-size unlimited
(gdb) PASS: gdb.trace/trace-buffer-size.exp: set trace-buffer-size unlimited
That "memory clobbered past end of allocated block" is mcheck triggering.
Valgrind shows:
==23624== Invalid write of size 1
==23624== at 0x418DD8: clear_trace_buffer (tracepoint.c:1443)
==23624== by 0x418F3A: init_trace_buffer (tracepoint.c:1497)
==23624== by 0x41D95B: cmd_bigqtbuffer_size (tracepoint.c:4061)
==23624== by 0x41DEEC: handle_tracepoint_general_set (tracepoint.c:4193)
clear_trace_buffer does:
static void
clear_trace_buffer (void)
{
trace_buffer_start = trace_buffer_lo;
trace_buffer_free = trace_buffer_lo;
trace_buffer_end_free = trace_buffer_hi;
trace_buffer_wrap = trace_buffer_hi;
/* A traceframe with zeroed fields marks the end of trace data. */
((struct traceframe *) trace_buffer_free)->tpnum = 0;
((struct traceframe *) trace_buffer_free)->data_size = 0;
traceframe_read_count = traceframe_write_count = 0;
traceframes_created = 0;
}
And the tpnum+data_size fields are over 4 bytes... This fixes it by
ensuring we allocate space at least for an EOB. We have code
elsewhere that relies on the EOB being present (like e.g.,
find_traceframe), so this seems simplest.
gdb/gdbserver/
2013-09-02 Pedro Alves <palves@redhat.com>
* tracepoint.c (TRACEFRAME_EOB_MARKER_SIZE): New macro.
(init_trace_buffer): Ensure at least TRACEFRAME_EOB_MARKER_SIZE is
allocated.
(trace_buffer_alloc): Use TRACEFRAME_EOB_MARKER_SIZE.
When I added gdb_read_memory, with bits factored out from elsewhere, I
missed adjusting this error return. gdb_read_memory has an interface
similar to Like GDB's xfer_partial:
> /* Read trace frame or inferior memory. Returns the number of bytes
> actually read, zero when no further transfer is possible, and -1 on
> error. Return of a positive value smaller than LEN does not
> indicate there's no more to be read, only the end of the transfer.
Returning EIO, a positive value, is obviously bogus, for the caller
will confuse it with a successful partial transfer.
Found by inspection.
Tested on x86_64 Fedora 17.
gdb/gdbserver/
2013-09-02 Pedro Alves <palves@redhat.com>
* server.c (gdb_read_memory): Return -1 on traceframe memory read
error instead of EIO.
Eli Zaretskii