enum { REMOTE_ALIGN_WRITES = 16 };
/* Prototypes for local functions. */
-static void async_cleanup_sigint_signal_handler (void *dummy);
static int getpkt_sane (char **buf, long *sizeof_buf, int forever);
static int getpkt_or_notif_sane (char **buf, long *sizeof_buf,
int forever, int *is_notif);
-static void async_handle_remote_sigint (int);
-static void async_handle_remote_sigint_twice (int);
-
static void remote_files_info (struct target_ops *ignore);
static void remote_prepare_to_store (struct target_ops *self,
static void remote_thread_events (struct target_ops *ops, int enable);
-static void sync_remote_interrupt_twice (int signo);
-
static void interrupt_query (void);
static void set_general_thread (struct ptid ptid);
static void readahead_cache_invalidate (void);
+static void remote_unpush_and_throw (void);
+
/* For "remote". */
static struct cmd_list_element *remote_cmdlist;
responded to that. */
int ctrlc_pending_p;
+ /* True if we saw a Ctrl-C while reading or writing from/to the
+ remote descriptor. At that point it is not safe to send a remote
+ interrupt packet, so we instead remember we saw the Ctrl-C and
+ process it once we're done with sending/receiving the current
+ packet, which should be shortly. If however that takes too long,
+ and the user presses Ctrl-C again, we offer to disconnect. */
+ int got_ctrlc_during_io;
+
/* Descriptor for I/O to remote machine. Initialize it to NULL so that
remote_open knows that we don't have a file open when the program
starts. */
int last_sent_step;
+ /* The execution direction of the last resume we got. */
+ enum exec_direction_kind last_resume_exec_dir;
+
char *finished_object;
char *finished_annex;
ULONGEST finished_offset;
request/reply nature of the RSP. We only cache data for a single
file descriptor at a time. */
struct readahead_cache readahead_cache;
-
- /* gdbserver < 7.7 (before its fix from 2013-12-11) did reply to any
- unknown 'v' packet with string "OK". "OK" gets interpreted by GDB
- as a reply to known packet. For packet "vFile:setfs:" it is an
- invalid reply and GDB would return error in
- remote_hostio_set_filesystem, making remote files access impossible.
- If this variable is non-zero it means the remote gdbserver is buggy
- and any not yet detected packets are assumed as unsupported. */
- int unknown_v_replies_ok;
};
/* Private data that we'll store in (struct thread_info)->private. */
result->buf = (char *) xmalloc (result->buf_size);
result->remote_traceframe_number = -1;
result->last_sent_signal = GDB_SIGNAL_0;
+ result->last_resume_exec_dir = EXEC_FORWARD;
result->fs_pid = -1;
return result;
case AUTO_BOOLEAN_FALSE:
return PACKET_DISABLE;
case AUTO_BOOLEAN_AUTO:
- {
- struct remote_state *rs = get_remote_state ();
-
- if (rs->unknown_v_replies_ok && config->name != NULL
- && config->name[0] == 'v')
- return PACKET_DISABLE;
- }
return config->support;
default:
gdb_assert_not_reached (_("bad switch"));
return 0;
}
-/* Tokens for use by the asynchronous signal handlers for SIGINT. */
-static struct async_signal_handler *async_sigint_remote_twice_token;
-static struct async_signal_handler *async_sigint_remote_token;
-
\f
/* Asynchronous signal handle registered as event loop source for
when we have pending events ready to be passed to the core. */
if (rs->remote_desc == NULL)
return; /* already closed */
- /* Make sure we leave stdin registered in the event loop, and we
- don't leave the async SIGINT signal handler installed. */
+ /* Make sure we leave stdin registered in the event loop. */
remote_terminal_ours (self);
serial_close (rs->remote_desc);
set_last_target_status (inferior_ptid, thread->suspend.waitstatus);
}
+/* Start the remote connection and sync state. */
+
static void
remote_start_remote (int from_tty, struct target_ops *target, int extended_p)
{
struct packet_config *noack_config;
char *wait_status = NULL;
- immediate_quit++; /* Allow user to interrupt it. */
+ /* Signal other parts that we're going through the initial setup,
+ and so things may not be stable yet. E.g., we don't try to
+ install tracepoints until we've relocated symbols. Also, a
+ Ctrl-C before we're connected and synced up can't interrupt the
+ target. Instead, it offers to drop the (potentially wedged)
+ connection. */
+ rs->starting_up = 1;
+
QUIT;
if (interrupt_on_connect)
send_interrupt_sequence ();
/* Ack any packet which the remote side has already sent. */
- serial_write (rs->remote_desc, "+", 1);
-
- /* Signal other parts that we're going through the initial setup,
- and so things may not be stable yet. */
- rs->starting_up = 1;
+ remote_serial_write ("+", 1);
/* The first packet we send to the target is the optional "supported
packets" request. If the target can answer this, it will tell us
if (packet_support (PACKET_QAllow) != PACKET_DISABLE)
remote_set_permissions (target);
- /* See unknown_v_replies_ok description. */
+ /* gdbserver < 7.7 (before its fix from 2013-12-11) did reply to any
+ unknown 'v' packet with string "OK". "OK" gets interpreted by GDB
+ as a reply to known packet. For packet "vFile:setfs:" it is an
+ invalid reply and GDB would return error in
+ remote_hostio_set_filesystem, making remote files access impossible.
+ Disable "vFile:setfs:" in such case. Do not disable other 'v' packets as
+ other "vFile" packets get correctly detected even on gdbserver < 7.7. */
{
const char v_mustreplyempty[] = "vMustReplyEmpty";
putpkt (v_mustreplyempty);
getpkt (&rs->buf, &rs->buf_size, 0);
if (strcmp (rs->buf, "OK") == 0)
- rs->unknown_v_replies_ok = 1;
- else if (strcmp (rs->buf, "") == 0)
- rs->unknown_v_replies_ok = 0;
- else
+ remote_protocol_packets[PACKET_vFile_setfs].support = PACKET_DISABLE;
+ else if (strcmp (rs->buf, "") != 0)
error (_("Remote replied unexpectedly to '%s': %s"), v_mustreplyempty,
rs->buf);
}
strcpy (rs->buf, wait_status);
rs->cached_wait_status = 1;
- immediate_quit--;
start_remote (from_tty); /* Initialize gdb process mechanisms. */
}
else
}
}
+/* Serial QUIT handler for the remote serial descriptor.
+
+ Defers handling a Ctrl-C until we're done with the current
+ command/response packet sequence, unless:
+
+ - We're setting up the connection. Don't send a remote interrupt
+ request, as we're not fully synced yet. Quit immediately
+ instead.
+
+ - The target has been resumed in the foreground
+ (target_terminal_is_ours is false) with a synchronous resume
+ packet, and we're blocked waiting for the stop reply, thus a
+ Ctrl-C should be immediately sent to the target.
+
+ - We get a second Ctrl-C while still within the same serial read or
+ write. In that case the serial is seemingly wedged --- offer to
+ quit/disconnect.
+
+ - We see a second Ctrl-C without target response, after having
+ previously interrupted the target. In that case the target/stub
+ is probably wedged --- offer to quit/disconnect.
+*/
+
+static void
+remote_serial_quit_handler (void)
+{
+ struct remote_state *rs = get_remote_state ();
+
+ if (check_quit_flag ())
+ {
+ /* If we're starting up, we're not fully synced yet. Quit
+ immediately. */
+ if (rs->starting_up)
+ quit ();
+ else if (rs->got_ctrlc_during_io)
+ {
+ if (query (_("The target is not responding to GDB commands.\n"
+ "Stop debugging it? ")))
+ remote_unpush_and_throw ();
+ }
+ /* If ^C has already been sent once, offer to disconnect. */
+ else if (!target_terminal_is_ours () && rs->ctrlc_pending_p)
+ interrupt_query ();
+ /* All-stop protocol, and blocked waiting for stop reply. Send
+ an interrupt request. */
+ else if (!target_terminal_is_ours () && rs->waiting_for_stop_reply)
+ target_interrupt (inferior_ptid);
+ else
+ rs->got_ctrlc_during_io = 1;
+ }
+}
+
/* Remove any of the remote.c targets from target stack. Upper targets depend
on it so remove them first. */
pop_all_targets_at_and_above (process_stratum);
}
+static void
+remote_unpush_and_throw (void)
+{
+ remote_unpush_target ();
+ throw_error (TARGET_CLOSE_ERROR, _("Disconnected from target."));
+}
+
static void
remote_open_1 (const char *name, int from_tty,
struct target_ops *target, int extended_p)
rs->extended = extended_p;
rs->waiting_for_stop_reply = 0;
rs->ctrlc_pending_p = 0;
+ rs->got_ctrlc_during_io = 0;
rs->general_thread = not_sent_ptid;
rs->continue_thread = not_sent_ptid;
rs->remote_traceframe_number = -1;
+ rs->last_resume_exec_dir = EXEC_FORWARD;
+
/* Probe for ability to use "ThreadInfo" query, as required. */
rs->use_threadinfo_query = 1;
rs->use_threadextra_query = 1;
readahead_cache_invalidate ();
+ /* Start out by owning the terminal. */
+ remote_async_terminal_ours_p = 1;
+
if (target_async_permitted)
{
- /* With this target we start out by owning the terminal. */
- remote_async_terminal_ours_p = 1;
-
/* FIXME: cagney/1999-09-23: During the initial connection it is
assumed that the target is already ready and able to respond to
requests. Unfortunately remote_start_remote() eventually calls
rs->last_sent_signal = siggnal;
rs->last_sent_step = step;
+ rs->last_resume_exec_dir = execution_direction;
+
/* The vCont packet doesn't need to specify threads via Hc. */
/* No reverse support (yet) for vCont. */
if (execution_direction != EXEC_REVERSE)
}
\f
-/* Set up the signal handler for SIGINT, while the target is
- executing, ovewriting the 'regular' SIGINT signal handler. */
-static void
-async_initialize_sigint_signal_handler (void)
-{
- signal (SIGINT, async_handle_remote_sigint);
-}
-
-/* Signal handler for SIGINT, while the target is executing. */
-static void
-async_handle_remote_sigint (int sig)
-{
- signal (sig, async_handle_remote_sigint_twice);
- /* Note we need to go through gdb_call_async_signal_handler in order
- to wake up the event loop on Windows. */
- gdb_call_async_signal_handler (async_sigint_remote_token, 0);
-}
-
-/* Signal handler for SIGINT, installed after SIGINT has already been
- sent once. It will take effect the second time that the user sends
- a ^C. */
-static void
-async_handle_remote_sigint_twice (int sig)
-{
- signal (sig, async_handle_remote_sigint);
- /* See note in async_handle_remote_sigint. */
- gdb_call_async_signal_handler (async_sigint_remote_twice_token, 0);
-}
-
-/* Implementation of to_check_pending_interrupt. */
-
-static void
-remote_check_pending_interrupt (struct target_ops *self)
-{
- struct async_signal_handler *token = async_sigint_remote_twice_token;
-
- if (async_signal_handler_is_marked (token))
- {
- clear_async_signal_handler (token);
- call_async_signal_handler (token);
- }
-}
-
-/* Perform the real interruption of the target execution, in response
- to a ^C. */
-static void
-async_remote_interrupt (gdb_client_data arg)
-{
- if (remote_debug)
- fprintf_unfiltered (gdb_stdlog, "async_remote_interrupt called\n");
-
- target_interrupt (inferior_ptid);
-}
-
-/* Perform interrupt, if the first attempt did not succeed. Just give
- up on the target alltogether. */
-static void
-async_remote_interrupt_twice (gdb_client_data arg)
-{
- if (remote_debug)
- fprintf_unfiltered (gdb_stdlog, "async_remote_interrupt_twice called\n");
-
- interrupt_query ();
-}
-
-/* Reinstall the usual SIGINT handlers, after the target has
- stopped. */
-static void
-async_cleanup_sigint_signal_handler (void *dummy)
-{
- signal (SIGINT, handle_sigint);
-}
-
-/* Send ^C to target to halt it. Target will respond, and send us a
- packet. */
-static void (*ofunc) (int);
-
-/* The command line interface's interrupt routine. This function is installed
- as a signal handler for SIGINT. The first time a user requests an
- interrupt, we call remote_interrupt to send a break or ^C. If there is no
- response from the target (it didn't stop when the user requested it),
- we ask the user if he'd like to detach from the target. */
-
-static void
-sync_remote_interrupt (int signo)
-{
- /* If this doesn't work, try more severe steps. */
- signal (signo, sync_remote_interrupt_twice);
-
- gdb_call_async_signal_handler (async_sigint_remote_token, 1);
-}
-
-/* The user typed ^C twice. */
-
-static void
-sync_remote_interrupt_twice (int signo)
-{
- signal (signo, ofunc);
- gdb_call_async_signal_handler (async_sigint_remote_twice_token, 1);
- signal (signo, sync_remote_interrupt);
-}
-
/* Non-stop version of target_stop. Uses `vCont;t' to stop a remote
thread, all threads of a remote process, or all threads of all
processes. */
/* Non-stop version of target_interrupt. Uses `vCtrlC' to interrupt
the remote target. It is undefined which thread of which process
- reports the interrupt. Returns true if the packet is supported by
- the server, false otherwise. */
+ reports the interrupt. Throws an error if the packet is not
+ supported by the server. */
-static int
+static void
remote_interrupt_ns (void)
{
struct remote_state *rs = get_remote_state ();
case PACKET_OK:
break;
case PACKET_UNKNOWN:
- return 0;
+ error (_("No support for interrupting the remote target."));
case PACKET_ERROR:
error (_("Interrupting target failed: %s"), rs->buf);
}
-
- return 1;
}
/* Implement the to_stop function for the remote targets. */
static void
remote_interrupt (struct target_ops *self, ptid_t ptid)
{
+ struct remote_state *rs = get_remote_state ();
+
if (remote_debug)
fprintf_unfiltered (gdb_stdlog, "remote_interrupt called\n");
- if (non_stop)
- {
- /* In non-stop mode, we always stop with no signal instead. */
- remote_stop_ns (ptid);
- }
+ if (target_is_non_stop_p ())
+ remote_interrupt_ns ();
else
- {
- /* In all-stop, we emulate ^C-ing the remote target's
- terminal. */
- if (target_is_non_stop_p ())
- {
- if (!remote_interrupt_ns ())
- {
- /* No support for ^C-ing the remote target. Stop it
- (with no signal) instead. */
- remote_stop_ns (ptid);
- }
- }
- else
- remote_interrupt_as ();
- }
+ remote_interrupt_as ();
+}
+
+/* Implement the to_pass_ctrlc function for the remote targets. */
+
+static void
+remote_pass_ctrlc (struct target_ops *self)
+{
+ struct remote_state *rs = get_remote_state ();
+
+ if (remote_debug)
+ fprintf_unfiltered (gdb_stdlog, "remote_pass_ctrlc called\n");
+
+ /* If we're starting up, we're not fully synced yet. Quit
+ immediately. */
+ if (rs->starting_up)
+ quit ();
+ /* If ^C has already been sent once, offer to disconnect. */
+ else if (rs->ctrlc_pending_p)
+ interrupt_query ();
+ else
+ target_interrupt (inferior_ptid);
}
/* Ask the user what to do when an interrupt is received. */
interrupt_query (void)
{
struct remote_state *rs = get_remote_state ();
- struct cleanup *old_chain;
-
- old_chain = make_cleanup_restore_target_terminal ();
- target_terminal_ours ();
if (rs->waiting_for_stop_reply && rs->ctrlc_pending_p)
{
"Give up waiting? ")))
quit ();
}
-
- do_cleanups (old_chain);
}
/* Enable/disable target terminal ownership. Most targets can use
static void
remote_terminal_inferior (struct target_ops *self)
{
- if (!target_async_permitted)
- /* Nothing to do. */
- return;
-
/* FIXME: cagney/1999-09-27: Make calls to target_terminal_*()
idempotent. The event-loop GDB talking to an asynchronous target
with a synchronous command calls this function from both
can go away. */
if (!remote_async_terminal_ours_p)
return;
- delete_file_handler (input_fd);
remote_async_terminal_ours_p = 0;
- async_initialize_sigint_signal_handler ();
/* NOTE: At this point we could also register our selves as the
recipient of all input. Any characters typed could then be
passed on down to the target. */
static void
remote_terminal_ours (struct target_ops *self)
{
- if (!target_async_permitted)
- /* Nothing to do. */
- return;
-
/* See FIXME in remote_terminal_inferior. */
if (remote_async_terminal_ours_p)
return;
- async_cleanup_sigint_signal_handler (NULL);
- add_file_handler (input_fd, stdin_event_handler, 0);
remote_async_terminal_ours_p = 1;
}
return minus_one_ptid;
}
- 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 ())
- {
- clear_quit_flag ();
- sync_remote_interrupt (SIGINT);
- }
- }
-
/* FIXME: cagney/1999-09-27: If we're in async mode we should
_never_ wait for ever -> test on target_is_async_p().
However, before we do that we need to ensure that the caller
ret = getpkt_or_notif_sane (&rs->buf, &rs->buf_size,
forever, &is_notif);
- if (!target_is_async_p ())
- signal (SIGINT, ofunc);
-
/* GDB gets a notification. Return to core as this event is
not interesting. */
if (ret != -1 && is_notif)
safe_strerror (saved_errno));
}
-/* Read a single character from the remote end. */
+/* Read a single character from the remote end. The current quit
+ handler is overridden to avoid quitting in the middle of packet
+ sequence, as that would break communication with the remote server.
+ See remote_serial_quit_handler for more detail. */
static int
readchar (int timeout)
{
int ch;
struct remote_state *rs = get_remote_state ();
+ struct cleanup *old_chain;
+
+ old_chain = make_cleanup_override_quit_handler (remote_serial_quit_handler);
+
+ rs->got_ctrlc_during_io = 0;
ch = serial_readchar (rs->remote_desc, timeout);
+ if (rs->got_ctrlc_during_io)
+ set_quit_flag ();
+
+ do_cleanups (old_chain);
+
if (ch >= 0)
return ch;
}
/* Wrapper for serial_write that closes the target and throws if
- writing fails. */
+ writing fails. The current quit handler is overridden to avoid
+ quitting in the middle of packet sequence, as that would break
+ communication with the remote server. See
+ remote_serial_quit_handler for more detail. */
static void
remote_serial_write (const char *str, int len)
{
struct remote_state *rs = get_remote_state ();
+ struct cleanup *old_chain;
+
+ old_chain = make_cleanup_override_quit_handler (remote_serial_quit_handler);
+
+ rs->got_ctrlc_during_io = 0;
if (serial_write (rs->remote_desc, str, len))
{
unpush_and_perror (_("Remote communication error. "
"Target disconnected."));
}
+
+ if (rs->got_ctrlc_during_io)
+ set_quit_flag ();
+
+ do_cleanups (old_chain);
}
/* Send the command in *BUF to the remote machine, and read the reply
if (forever) /* Watchdog went off? Kill the target. */
{
- QUIT;
remote_unpush_target ();
throw_error (TARGET_CLOSE_ERROR,
_("Watchdog timeout has expired. "
return 0;
}
+/* Implementation of the to_execution_direction method for the remote
+ target. */
+
+static enum exec_direction_kind
+remote_execution_direction (struct target_ops *self)
+{
+ struct remote_state *rs = get_remote_state ();
+
+ return rs->last_resume_exec_dir;
+}
+
static void
init_remote_ops (void)
{
remote_ops.to_get_ada_task_ptid = remote_get_ada_task_ptid;
remote_ops.to_stop = remote_stop;
remote_ops.to_interrupt = remote_interrupt;
- remote_ops.to_check_pending_interrupt = remote_check_pending_interrupt;
+ remote_ops.to_pass_ctrlc = remote_pass_ctrlc;
remote_ops.to_xfer_partial = remote_xfer_partial;
remote_ops.to_rcmd = remote_rcmd;
remote_ops.to_pid_to_exec_file = remote_pid_to_exec_file;
remote_ops.to_remove_vfork_catchpoint = remote_remove_vfork_catchpoint;
remote_ops.to_insert_exec_catchpoint = remote_insert_exec_catchpoint;
remote_ops.to_remove_exec_catchpoint = remote_remove_exec_catchpoint;
+ remote_ops.to_execution_direction = remote_execution_direction;
}
/* Set up the extended remote vector by making a copy of the standard
when it exits. */
observer_attach_inferior_exit (discard_pending_stop_replies);
- /* Set up signal handlers. */
- async_sigint_remote_token =
- create_async_signal_handler (async_remote_interrupt, NULL);
- async_sigint_remote_twice_token =
- create_async_signal_handler (async_remote_interrupt_twice, NULL);
-
#if 0
init_remote_threadtests ();
#endif
projects / deliverable / binutils-gdb.git / blobdiff