diff options
| -rw-r--r-- | gdb/ChangeLog | 20 | ||||
| -rw-r--r-- | gdb/NEWS | 5 | ||||
| -rw-r--r-- | gdb/doc/ChangeLog | 7 | ||||
| -rw-r--r-- | gdb/doc/gdb.texinfo | 46 | ||||
| -rw-r--r-- | gdb/gdbserver/ChangeLog | 10 | ||||
| -rw-r--r-- | gdb/gdbserver/linux-low.c | 107 | ||||
| -rw-r--r-- | gdb/gdbserver/server.c | 33 | ||||
| -rw-r--r-- | gdb/gdbserver/server.h | 2 | ||||
| -rw-r--r-- | gdb/inferior.h | 2 | ||||
| -rw-r--r-- | gdb/infrun.c | 10 | ||||
| -rw-r--r-- | gdb/remote.c | 75 | ||||
| -rw-r--r-- | gdb/target.c | 31 | ||||
| -rw-r--r-- | gdb/target.h | 20 |
13 files changed, 359 insertions, 9 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 19f8fd8..18a6540 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,25 @@ 2012-03-07 Pedro Alves <palves@redhat.com> + * NEWS: Mention QProgramSignals. + * inferior.h (update_signals_program_target): Declare. + * infrun.c: (update_signals_program_target): New. + (handle_command): Update the target of the new program signals + array changes. + * remote.c (PACKET_QProgramSignals): New enum. + (last_program_signals_packet): New global. + (remote_program_signals): New. + (remote_start_remote): Update the target with the program signals + list. + (remote_protocol_features): Add entry for QPassSignals. + (remote_open_1): Free anc clear last_program_signals_packet. + (init_remote_ops): Install remote_program_signals. + * target.c (update_current_target): Adjust. + (target_program_signals): New. + * target.h (struct target_ops) <to_program_signals>: New field. + (target_program_signals): Declare. + +2012-03-07 Pedro Alves <palves@redhat.com> + * NEWS: Add subtitle for new z0/z1 conditional breakpoint extensions. @@ -97,6 +97,11 @@ z0/z1 conditional breakpoints extension condition evaluation mode. The use of this extension can be controlled via the "set remote conditional-breakpoints-packet" command. +QProgramSignals: + + Specify the signals which the remote stub may pass to the debugged + program without GDB involvement. + *** Changes in GDB 7.4 * GDB now handles ambiguous linespecs more consistently; the existing diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog index 3c7357a..20f2816 100644 --- a/gdb/doc/ChangeLog +++ b/gdb/doc/ChangeLog @@ -1,3 +1,10 @@ +2012-03-07 Pedro Alves <palves@redhat.com> + + * gdb.texinfo (General Query Packets): Document new + QProgramSignals packet. + * gdb.texinfo (Remote configuration): Mention + "program-signals-packet". + 2012-03-05 Tristan Gingold <gingold@adacore.com> * gdb.texinfo (General Query Packets): Document xfer:uib:read. diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 945b68d..e8bbded 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -17514,6 +17514,10 @@ are: @tab @code{QPassSignals} @tab @code{handle @var{signal}} +@item @code{program-signals} +@tab @code{QProgramSignals} +@tab @code{handle @var{signal}} + @item @code{hostio-close-packet} @tab @code{vFile:close} @tab @code{remote get}, @code{remote put} @@ -34974,6 +34978,48 @@ command (@pxref{Remote Configuration, set remote pass-signals}). This packet is not probed by default; the remote stub must request it, by supplying an appropriate @samp{qSupported} response (@pxref{qSupported}). +@item QProgramSignals: @var{signal} @r{[};@var{signal}@r{]}@dots{} +@cindex signals the inferior may see, remote request +@cindex @samp{QProgramSignals} packet +@anchor{QProgramSignals} +Each listed @var{signal} may be delivered to the inferior process. +Others should be silently discarded. + +In some cases, the remote stub may need to decide whether to deliver a +signal to the program or not without @value{GDBN} involvement. One +example of that is while detaching --- the program's threads may have +stopped for signals that haven't yet had a chance of being reported to +@value{GDBN}, and so the remote stub can use the signal list specified +by this packet to know whether to deliver or ignore those pending +signals. + +This does not influence whether to deliver a signal as requested by a +resumption packet (@pxref{vCont packet}). + +Signals are numbered identically to continue packets and stop replies +(@pxref{Stop Reply Packets}). Each @var{signal} list item should be +strictly greater than the previous item. Multiple +@samp{QProgramSignals} packets do not combine; any earlier +@samp{QProgramSignals} list is completely replaced by the new list. + +Reply: +@table @samp +@item OK +The request succeeded. + +@item E @var{nn} +An error occurred. @var{nn} are hex digits. + +@item +An empty reply indicates that @samp{QProgramSignals} is not supported +by the stub. +@end table + +Use of this packet is controlled by the @code{set remote program-signals} +command (@pxref{Remote Configuration, set remote program-signals}). +This packet is not probed by default; the remote stub must request it, +by supplying an appropriate @samp{qSupported} response (@pxref{qSupported}). + @item qRcmd,@var{command} @cindex execute remote command, remote request @cindex @samp{qRcmd} packet diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog index e1005ee..521866d 100644 --- a/gdb/gdbserver/ChangeLog +++ b/gdb/gdbserver/ChangeLog @@ -1,3 +1,13 @@ +2012-03-07 Pedro Alves <palves@redhat.com> + + * linux-low.c (get_detach_signal): New. + (linux_detach_one_lwp): Get rid of a pending SIGSTOP with SIGCONT. + Pass on pending signals to PTRACE_DETACH. Check the result of the + ptrace call. + * server.c (program_signals, program_signals_p): New. + (handle_general_set): Handle QProgramSignals. + * server.h (program_signals, program_signals_p): Declare. + 2012-03-05 Pedro Alves <palves@redhat.com> Jan Kratochvil <jan.kratochvil@redhat.com> diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c index 4f8ec6b..997e5a0 100644 --- a/gdb/gdbserver/linux-low.c +++ b/gdb/gdbserver/linux-low.c @@ -999,36 +999,127 @@ linux_kill (int pid) return 0; } +/* Get pending signal of THREAD, for detaching purposes. This is the + signal the thread last stopped for, which we need to deliver to the + thread when detaching, otherwise, it'd be suppressed/lost. */ + +static int +get_detach_signal (struct thread_info *thread) +{ + enum target_signal signo = TARGET_SIGNAL_0; + int status; + struct lwp_info *lp = get_thread_lwp (thread); + + if (lp->status_pending_p) + status = lp->status_pending; + else + { + /* If the thread had been suspended by gdbserver, and it stopped + cleanly, then it'll have stopped with SIGSTOP. But we don't + want to deliver that SIGSTOP. */ + if (thread->last_status.kind != TARGET_WAITKIND_STOPPED + || thread->last_status.value.sig == TARGET_SIGNAL_0) + return 0; + + /* Otherwise, we may need to deliver the signal we + intercepted. */ + status = lp->last_status; + } + + if (!WIFSTOPPED (status)) + { + if (debug_threads) + fprintf (stderr, + "GPS: lwp %s hasn't stopped: no pending signal\n", + target_pid_to_str (ptid_of (lp))); + return 0; + } + + /* Extended wait statuses aren't real SIGTRAPs. */ + if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) + { + if (debug_threads) + fprintf (stderr, + "GPS: lwp %s had stopped with extended " + "status: no pending signal\n", + target_pid_to_str (ptid_of (lp))); + return 0; + } + + signo = target_signal_from_host (WSTOPSIG (status)); + + if (program_signals_p && !program_signals[signo]) + { + if (debug_threads) + fprintf (stderr, + "GPS: lwp %s had signal %s, but it is in nopass state\n", + target_pid_to_str (ptid_of (lp)), + target_signal_to_string (signo)); + return 0; + } + else if (!program_signals_p + /* If we have no way to know which signals GDB does not + want to have passed to the program, assume + SIGTRAP/SIGINT, which is GDB's default. */ + && (signo == TARGET_SIGNAL_TRAP || signo == TARGET_SIGNAL_INT)) + { + if (debug_threads) + fprintf (stderr, + "GPS: lwp %s had signal %s, " + "but we don't know if we should pass it. Default to not.\n", + target_pid_to_str (ptid_of (lp)), + target_signal_to_string (signo)); + return 0; + } + else + { + if (debug_threads) + fprintf (stderr, + "GPS: lwp %s has pending signal %s: delivering it.\n", + target_pid_to_str (ptid_of (lp)), + target_signal_to_string (signo)); + + return WSTOPSIG (status); + } +} + static int linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) { struct thread_info *thread = (struct thread_info *) entry; struct lwp_info *lwp = get_thread_lwp (thread); int pid = * (int *) args; + int sig; if (ptid_get_pid (entry->id) != pid) return 0; - /* If this process is stopped but is expecting a SIGSTOP, then make - sure we take care of that now. This isn't absolutely guaranteed - to collect the SIGSTOP, but is fairly likely to. */ + /* If there is a pending SIGSTOP, get rid of it. */ if (lwp->stop_expected) { - int wstat; - /* Clear stop_expected, so that the SIGSTOP will be reported. */ + if (debug_threads) + fprintf (stderr, + "Sending SIGCONT to %s\n", + target_pid_to_str (ptid_of (lwp))); + + kill_lwp (lwpid_of (lwp), SIGCONT); lwp->stop_expected = 0; - linux_resume_one_lwp (lwp, 0, 0, NULL); - linux_wait_for_event (lwp->head.id, &wstat, __WALL); } /* Flush any pending changes to the process's registers. */ regcache_invalidate_one ((struct inferior_list_entry *) get_lwp_thread (lwp)); + /* Pass on any pending signal for this thread. */ + sig = get_detach_signal (thread); + /* Finally, let it resume. */ if (the_low_target.prepare_to_resume != NULL) the_low_target.prepare_to_resume (lwp); - ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0); + if (ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, sig) < 0) + error (_("Can't detach %s: %s"), + target_pid_to_str (ptid_of (lwp)), + strerror (errno)); delete_lwp (lwp); return 0; diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c index 0de3f52..586581c 100644 --- a/gdb/gdbserver/server.c +++ b/gdb/gdbserver/server.c @@ -59,6 +59,8 @@ int debug_threads; int debug_hw_points; int pass_signals[TARGET_SIGNAL_LAST]; +int program_signals[TARGET_SIGNAL_LAST]; +int program_signals_p; jmp_buf toplevel; @@ -455,6 +457,33 @@ handle_general_set (char *own_buf) return; } + if (strncmp ("QProgramSignals:", own_buf, strlen ("QProgramSignals:")) == 0) + { + int numsigs = (int) TARGET_SIGNAL_LAST, i; + const char *p = own_buf + strlen ("QProgramSignals:"); + CORE_ADDR cursig; + + program_signals_p = 1; + + p = decode_address_to_semicolon (&cursig, p); + for (i = 0; i < numsigs; i++) + { + if (i == cursig) + { + program_signals[i] = 1; + if (*p == '\0') + /* Keep looping, to clear the remaining signals. */ + cursig = -1; + else + p = decode_address_to_semicolon (&cursig, p); + } + else + program_signals[i] = 0; + } + strcpy (own_buf, "OK"); + return; + } + if (strcmp (own_buf, "QStartNoAckMode") == 0) { if (remote_debug) @@ -1584,7 +1613,9 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p) free (qsupported); } - sprintf (own_buf, "PacketSize=%x;QPassSignals+", PBUFSIZ - 1); + sprintf (own_buf, + "PacketSize=%x;QPassSignals+;QProgramSignals+", + PBUFSIZ - 1); if (the_target->qxfer_libraries_svr4 != NULL) strcat (own_buf, ";qXfer:libraries-svr4:read+"); diff --git a/gdb/gdbserver/server.h b/gdb/gdbserver/server.h index fad58e8..a419c36 100644 --- a/gdb/gdbserver/server.h +++ b/gdb/gdbserver/server.h @@ -292,6 +292,8 @@ extern int server_waiting; extern int debug_threads; extern int debug_hw_points; extern int pass_signals[]; +extern int program_signals[]; +extern int program_signals_p; extern jmp_buf toplevel; diff --git a/gdb/inferior.h b/gdb/inferior.h index 9b2817f..1563111 100644 --- a/gdb/inferior.h +++ b/gdb/inferior.h @@ -645,6 +645,8 @@ extern struct inferior *add_inferior_with_spaces (void); extern void update_observer_mode (void); +extern void update_signals_program_target (void); + /* In some circumstances we allow a command to specify a numeric signal. The idea is to keep these circumstances limited so that users (and scripts) develop portable habits. For comparison, diff --git a/gdb/infrun.c b/gdb/infrun.c index e383d77..103ef30 100644 --- a/gdb/infrun.c +++ b/gdb/infrun.c @@ -335,6 +335,15 @@ static unsigned char *signal_pass; (flags)[signum] = 0; \ } while (0) +/* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of + this function is to avoid exporting `signal_program'. */ + +void +update_signals_program_target (void) +{ + target_program_signals ((int) TARGET_SIGNAL_LAST, signal_program); +} + /* Value to pass to target_resume() to cause all threads to resume. */ #define RESUME_ALL minus_one_ptid @@ -6363,6 +6372,7 @@ Are you sure you want to change it? "), { signal_cache_update (-1); target_pass_signals ((int) TARGET_SIGNAL_LAST, signal_pass); + target_program_signals ((int) TARGET_SIGNAL_LAST, signal_program); if (from_tty) { diff --git a/gdb/remote.c b/gdb/remote.c index 45fec17..b3a331e 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -1259,6 +1259,7 @@ enum { PACKET_qGetTLSAddr, PACKET_qSupported, PACKET_QPassSignals, + PACKET_QProgramSignals, PACKET_qSearch_memory, PACKET_vAttach, PACKET_vRun, @@ -1669,6 +1670,65 @@ remote_pass_signals (int numsigs, unsigned char *pass_signals) } } +/* The last QProgramSignals packet sent to the target. We bypass + sending a new program signals list down to the target if the new + packet is exactly the same as the last we sent. IOW, we only let + the target know about program signals list changes. */ + +static char *last_program_signals_packet; + +/* If 'QProgramSignals' is supported, tell the remote stub what + signals it should pass through to the inferior when detaching. */ + +static void +remote_program_signals (int numsigs, unsigned char *signals) +{ + if (remote_protocol_packets[PACKET_QProgramSignals].support != PACKET_DISABLE) + { + char *packet, *p; + int count = 0, i; + + gdb_assert (numsigs < 256); + for (i = 0; i < numsigs; i++) + { + if (signals[i]) + count++; + } + packet = xmalloc (count * 3 + strlen ("QProgramSignals:") + 1); + strcpy (packet, "QProgramSignals:"); + p = packet + strlen (packet); + for (i = 0; i < numsigs; i++) + { + if (signal_pass_state (i)) + { + if (i >= 16) + *p++ = tohex (i >> 4); + *p++ = tohex (i & 15); + if (count) + *p++ = ';'; + else + break; + count--; + } + } + *p = 0; + if (!last_program_signals_packet + || strcmp (last_program_signals_packet, packet) != 0) + { + struct remote_state *rs = get_remote_state (); + char *buf = rs->buf; + + putpkt (packet); + getpkt (&rs->buf, &rs->buf_size, 0); + packet_ok (buf, &remote_protocol_packets[PACKET_QProgramSignals]); + xfree (last_program_signals_packet); + last_program_signals_packet = packet; + } + else + xfree (packet); + } +} + /* If PTID is MAGIC_NULL_PTID, don't set any thread. If PTID is MINUS_ONE_PTID, set the thread to -1, so the stub returns the thread. If GEN is set, set the general thread, if not, then set @@ -3246,6 +3306,10 @@ remote_start_remote (int from_tty, struct target_ops *target, int extended_p) getpkt (&rs->buf, &rs->buf_size, 0); } + /* Let the target know which signals it is allowed to pass down to + the program. */ + update_signals_program_target (); + /* Next, if the target can specify a description, read it. We do this before anything involving memory or registers. */ target_find_description (); @@ -3803,6 +3867,8 @@ static struct protocol_feature remote_protocol_features[] = { PACKET_qXfer_traceframe_info }, { "QPassSignals", PACKET_DISABLE, remote_supported_packet, PACKET_QPassSignals }, + { "QProgramSignals", PACKET_DISABLE, remote_supported_packet, + PACKET_QProgramSignals }, { "QStartNoAckMode", PACKET_DISABLE, remote_supported_packet, PACKET_QStartNoAckMode }, { "multiprocess", PACKET_DISABLE, remote_multi_process_feature, -1 }, @@ -4073,6 +4139,11 @@ remote_open_1 (char *name, int from_tty, xfree (last_pass_packet); last_pass_packet = NULL; + /* Make sure we send the program signals list the next time we + resume. */ + xfree (last_program_signals_packet); + last_program_signals_packet = NULL; + remote_fileio_reset (); reopen_exec_file (); reread_symbols (); @@ -10819,6 +10890,7 @@ Specify the serial device it is connected to\n\ remote_ops.to_load = generic_load; remote_ops.to_mourn_inferior = remote_mourn; remote_ops.to_pass_signals = remote_pass_signals; + remote_ops.to_program_signals = remote_program_signals; remote_ops.to_thread_alive = remote_thread_alive; remote_ops.to_find_new_threads = remote_threads_info; remote_ops.to_pid_to_str = remote_pid_to_str; @@ -11263,6 +11335,9 @@ Show the maximum size of the address (in bits) in a memory packet."), NULL, add_packet_config_cmd (&remote_protocol_packets[PACKET_QPassSignals], "QPassSignals", "pass-signals", 0); + add_packet_config_cmd (&remote_protocol_packets[PACKET_QProgramSignals], + "QProgramSignals", "program-signals", 0); + add_packet_config_cmd (&remote_protocol_packets[PACKET_qSymbol], "qSymbol", "symbol-lookup", 0); diff --git a/gdb/target.c b/gdb/target.c index 88703ea..cffea2c 100644 --- a/gdb/target.c +++ b/gdb/target.c @@ -639,6 +639,7 @@ update_current_target (void) /* Do not inherit to_mourn_inferior. */ INHERIT (to_can_run, t); /* Do not inherit to_pass_signals. */ + /* Do not inherit to_program_signals. */ /* Do not inherit to_thread_alive. */ /* Do not inherit to_find_new_threads. */ /* Do not inherit to_pid_to_str. */ @@ -2728,6 +2729,36 @@ target_pass_signals (int numsigs, unsigned char *pass_signals) } } +void +target_program_signals (int numsigs, unsigned char *program_signals) +{ + struct target_ops *t; + + for (t = current_target.beneath; t != NULL; t = t->beneath) + { + if (t->to_program_signals != NULL) + { + if (targetdebug) + { + int i; + + fprintf_unfiltered (gdb_stdlog, "target_program_signals (%d, {", + numsigs); + + for (i = 0; i < numsigs; i++) + if (program_signals[i]) + fprintf_unfiltered (gdb_stdlog, " %s", + target_signal_to_name (i)); + + fprintf_unfiltered (gdb_stdlog, " })\n"); + } + + (*t->to_program_signals) (numsigs, program_signals); + return; + } + } +} + /* Look through the list of possible targets for a target that can follow forks. */ diff --git a/gdb/target.h b/gdb/target.h index ed2bcdd..50a0ea6 100644 --- a/gdb/target.h +++ b/gdb/target.h @@ -511,6 +511,10 @@ struct target_ops target_* macro. */ void (*to_pass_signals) (int, unsigned char *); + /* Documentation of this routine is provided with the + corresponding target_* function. */ + void (*to_program_signals) (int, unsigned char *); + int (*to_thread_alive) (struct target_ops *, ptid_t ptid); void (*to_find_new_threads) (struct target_ops *); char *(*to_pid_to_str) (struct target_ops *, ptid_t); @@ -1261,6 +1265,22 @@ void target_mourn_inferior (void); extern void target_pass_signals (int nsig, unsigned char *pass_signals); +/* Set list of signals the target may pass to the inferior. This + directly maps to the "handle SIGNAL pass/nopass" setting. + + PROGRAM_SIGNALS is an array of size NSIG, indexed by target signal + number (enum target_signal). For every signal whose entry in this + array is non-zero, the target is allowed to pass the signal to the + inferior. Signals not present in the array shall be silently + discarded. This does not influence whether to pass signals to the + inferior as a result of a target_resume call. This is useful in + scenarios where the target needs to decide whether to pass or not a + signal to the inferior without GDB core involvement, such as for + example, when detaching (as threads may have been suspended with + pending signals not reported to GDB). */ + +extern void target_program_signals (int nsig, unsigned char *program_signals); + /* Check to see if a thread is still alive. */ extern int target_thread_alive (ptid_t ptid); |