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binutils-gdb/gdb/gdbserver/server.c
Pedro Alves fa96cb382c Teach GDBserver's Linux backend about no unwaited-for children (TARGET_WAITKIND_NO_RESUMED). 
GDBserver currently hangs forever in waitpid if the leader thread
exits before other threads, or if all resumed threads exit - e.g.,
next over a thread exit with sched-locking on.  This is exposed by
leader-exit.exp.  leader-exit.exp is part of a series of tests for a
set of related problems.  See
<http://www.sourceware.org/ml/gdb-patches/2011-10/msg00704.html>:

 "
 To recap, on the Linux kernel, ptrace/waitpid don't allow reaping the
 leader thread until all other threads in the group are reaped.  When
 the leader exits, it goes zombie, but waitpid will not return an exit
 status until the other threads are gone.  This is presently exercised
 by the gdb.threads/leader-exit.exp test.  The fix for that test, in
 linux-nat.c:wait_lwp, handles the case where we see the leader gone
 when we're stopping all threads to report an event to some other
 thread to the core.

 (...)

 The latter bit about not blocking if there no resumed threads in the
 process also applies to some other thread exiting, not just the main
 thread.  E.g., this test starts a thread, and runs to a breakpoint in
 that thread:

 ...
 (gdb) c
 Continuing.
 [New Thread 0x7ffff75a4700 (LWP 23397)]
 [Switching to Thread 0x7ffff75a4700 (LWP 23397)]

 Breakpoint 2, thread_a (arg=0x0) at ../../../src/gdb/testsuite/gdb.threads/no-unwaited-for-left.c:28
 28        return 0; /* break-here */
 (gdb) info threads
 * 2 Thread 0x7ffff75a4700 (LWP 23397)  thread_a (arg=0x0) at ../../../src/gdb/testsuite/gdb.threads/no-unwaited-for-left.c:28
   1 Thread 0x7ffff7fcb720 (LWP 23391)  0x00007ffff7bc606d in pthread_join (threadid=140737343276800, thread_return=0x0) at pthread_join.c:89

 The thread will exit as soon as we resume it.  But if we only resume
 that thread, leaving the rest of the threads stopped:

 (gdb) set scheduler-locking on
 (gdb) c
 Continuing.
 ^C^C^C^C^C^C^C^C
 "

This patch fixes the issues by implementing TARGET_WAITKIND_NO_RESUMED
on GDBserver, similarly to what the patch above did for native
Linux GDB.

gdb.threads/leader-exit.exp now passes.

gdb.threads/no-unwaited-for-left.exp now at least errors out instead
of hanging:

 continue
 Continuing.
 warning: Remote failure reply: E.No unwaited-for children left.

 [Thread 15454] #1 stopped.
 0x00000034cf408e60 in pthread_join (threadid=140737353922368, thread_return=0x0) at pthread_join.c:93
 93          lll_wait_tid (pd->tid);
 (gdb) FAIL: gdb.threads/no-unwaited-for-left.exp: continue stops when the main thread exits

The gdb.threads/non-ldr-exc-*.exp tests are skipped because GDBserver
unfortunately doesn't support fork/exec yet, but I'm confident this
fixes the related issues.

I'm leaving modeling TARGET_WAITKIND_NO_RESUMED in the RSP for a
separate pass.

(BTW, in case of error in response to a vCont, it would be better for
GDB to query the target for the current thread, or re-select one,
instead of assuming current inferior_ptid is still the selected
thread.)

This implementation is a little different from GDB's, because I'm
avoiding bringing in more of this broken use of waitpid(PID) into
GDBserver.  Specifically, this avoids waitpid(PID) when stopping all
threads.  There's really no need for wait_for_sigstop to wait for each
LWP in turn.  Instead, with some refactoring, we make it reuse
linux_wait_for_event.

gdb/gdbserver/
2014-02-27  Pedro Alves  <palves@redhat.com>

	PR 12702
	* inferiors.h (A_I_NEXT, ALL_INFERIORS_TYPE, ALL_PROCESSES): New
	macros.
	* linux-low.c (delete_lwp, handle_extended_wait): Add debug
	output.
	(last_thread_of_process_p): Take a PID argument instead of a
	thread pointer.
	(linux_wait_for_lwp): Delete.
	(num_lwps, check_zombie_leaders, not_stopped_callback): New
	functions.
	(linux_low_filter_event): New function, party factored out from
	linux_wait_for_event.
	(linux_wait_for_event): Rename to ...
	(linux_wait_for_event_filtered): ... this.  Add new filter ptid
	argument.  Partly rewrite.  Always use waitpid(-1, WNOHANG) and
	sigsuspend.  Check for zombie leaders.
	(linux_wait_for_event): Reimplement as wrapper around
	linux_wait_for_event_filtered.
	(linux_wait_1): Handle TARGET_WAITKIND_NO_RESUMED.  Assume that if
	a normal or signal exit is seen, it's the whole process exiting.
	(wait_for_sigstop): No longer a for_each_inferior callback.
	Rewrite on top of linux_wait_for_event_filtered.
	(stop_all_lwps): Call wait_for_sigstop directly.
	* server.c (resume, handle_target_event): Handle
	TARGET_WAITKIND_NO_RESUMED.
2014-02-27 14:30:08 +00:00

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/* Main code for remote server for GDB.
Copyright (C) 1989-2014 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "server.h"
#include "gdbthread.h"
#include "agent.h"
#include "notif.h"
#include "tdesc.h"
#include "rsp-low.h"
#include <ctype.h>
#include <unistd.h>
#if HAVE_SIGNAL_H
#include <signal.h>
#endif
#include "gdb_vecs.h"
#include "gdb_wait.h"
#include "btrace-common.h"
#include "filestuff.h"
#include "tracepoint.h"
#include "dll.h"
#include "hostio.h"
/* The thread set with an `Hc' packet. `Hc' is deprecated in favor of
`vCont'. Note the multi-process extensions made `vCont' a
requirement, so `Hc pPID.TID' is pretty much undefined. So
CONT_THREAD can be null_ptid for no `Hc' thread, minus_one_ptid for
resuming all threads of the process (again, `Hc' isn't used for
multi-process), or a specific thread ptid_t.
We also set this when handling a single-thread `vCont' resume, as
some places in the backends check it to know when (and for which
thread) single-thread scheduler-locking is in effect. */
ptid_t cont_thread;
/* The thread set with an `Hg' packet. */
ptid_t general_thread;
int server_waiting;
static int extended_protocol;
static int response_needed;
static int exit_requested;
/* --once: Exit after the first connection has closed. */
int run_once;
int multi_process;
int non_stop;
/* Whether we should attempt to disable the operating system's address
space randomization feature before starting an inferior. */
int disable_randomization = 1;
static char **program_argv, **wrapper_argv;
/* Enable debugging of h/w breakpoint/watchpoint support. */
int debug_hw_points;
int pass_signals[GDB_SIGNAL_LAST];
int program_signals[GDB_SIGNAL_LAST];
int program_signals_p;
jmp_buf toplevel;
/* The PID of the originally created or attached inferior. Used to
send signals to the process when GDB sends us an asynchronous interrupt
(user hitting Control-C in the client), and to wait for the child to exit
when no longer debugging it. */
unsigned long signal_pid;
#ifdef SIGTTOU
/* A file descriptor for the controlling terminal. */
int terminal_fd;
/* TERMINAL_FD's original foreground group. */
pid_t old_foreground_pgrp;
/* Hand back terminal ownership to the original foreground group. */
static void
restore_old_foreground_pgrp (void)
{
tcsetpgrp (terminal_fd, old_foreground_pgrp);
}
#endif
/* Set if you want to disable optional thread related packets support
in gdbserver, for the sake of testing GDB against stubs that don't
support them. */
int disable_packet_vCont;
int disable_packet_Tthread;
int disable_packet_qC;
int disable_packet_qfThreadInfo;
/* Last status reported to GDB. */
static struct target_waitstatus last_status;
static ptid_t last_ptid;
static char *own_buf;
static unsigned char *mem_buf;
/* A sub-class of 'struct notif_event' for stop, holding information
relative to a single stop reply. We keep a queue of these to
push to GDB in non-stop mode. */
struct vstop_notif
{
struct notif_event base;
/* Thread or process that got the event. */
ptid_t ptid;
/* Event info. */
struct target_waitstatus status;
};
DEFINE_QUEUE_P (notif_event_p);
/* Put a stop reply to the stop reply queue. */
static void
queue_stop_reply (ptid_t ptid, struct target_waitstatus *status)
{
struct vstop_notif *new_notif = xmalloc (sizeof (*new_notif));
new_notif->ptid = ptid;
new_notif->status = *status;
notif_event_enque (&notif_stop, (struct notif_event *) new_notif);
}
static int
remove_all_on_match_pid (QUEUE (notif_event_p) *q,
QUEUE_ITER (notif_event_p) *iter,
struct notif_event *event,
void *data)
{
int *pid = data;
if (*pid == -1
|| ptid_get_pid (((struct vstop_notif *) event)->ptid) == *pid)
{
if (q->free_func != NULL)
q->free_func (event);
QUEUE_remove_elem (notif_event_p, q, iter);
}
return 1;
}
/* Get rid of the currently pending stop replies for PID. If PID is
-1, then apply to all processes. */
static void
discard_queued_stop_replies (int pid)
{
QUEUE_iterate (notif_event_p, notif_stop.queue,
remove_all_on_match_pid, &pid);
}
static void
vstop_notif_reply (struct notif_event *event, char *own_buf)
{
struct vstop_notif *vstop = (struct vstop_notif *) event;
prepare_resume_reply (own_buf, vstop->ptid, &vstop->status);
}
struct notif_server notif_stop =
{
"vStopped", "Stop", NULL, vstop_notif_reply,
};
static int
target_running (void)
{
return get_first_thread () != NULL;
}
static int
start_inferior (char **argv)
{
char **new_argv = argv;
if (wrapper_argv != NULL)
{
int i, count = 1;
for (i = 0; wrapper_argv[i] != NULL; i++)
count++;
for (i = 0; argv[i] != NULL; i++)
count++;
new_argv = alloca (sizeof (char *) * count);
count = 0;
for (i = 0; wrapper_argv[i] != NULL; i++)
new_argv[count++] = wrapper_argv[i];
for (i = 0; argv[i] != NULL; i++)
new_argv[count++] = argv[i];
new_argv[count] = NULL;
}
if (debug_threads)
{
int i;
for (i = 0; new_argv[i]; ++i)
debug_printf ("new_argv[%d] = \"%s\"\n", i, new_argv[i]);
debug_flush ();
}
#ifdef SIGTTOU
signal (SIGTTOU, SIG_DFL);
signal (SIGTTIN, SIG_DFL);
#endif
/* Clear this so the backend doesn't get confused, thinking
CONT_THREAD died, and it needs to resume all threads. */
cont_thread = null_ptid;
signal_pid = create_inferior (new_argv[0], new_argv);
/* FIXME: we don't actually know at this point that the create
actually succeeded. We won't know that until we wait. */
fprintf (stderr, "Process %s created; pid = %ld\n", argv[0],
signal_pid);
fflush (stderr);
#ifdef SIGTTOU
signal (SIGTTOU, SIG_IGN);
signal (SIGTTIN, SIG_IGN);
terminal_fd = fileno (stderr);
old_foreground_pgrp = tcgetpgrp (terminal_fd);
tcsetpgrp (terminal_fd, signal_pid);
atexit (restore_old_foreground_pgrp);
#endif
if (wrapper_argv != NULL)
{
struct thread_resume resume_info;
memset (&resume_info, 0, sizeof (resume_info));
resume_info.thread = pid_to_ptid (signal_pid);
resume_info.kind = resume_continue;
resume_info.sig = 0;
last_ptid = mywait (pid_to_ptid (signal_pid), &last_status, 0, 0);
if (last_status.kind != TARGET_WAITKIND_STOPPED)
return signal_pid;
do
{
(*the_target->resume) (&resume_info, 1);
last_ptid = mywait (pid_to_ptid (signal_pid), &last_status, 0, 0);
if (last_status.kind != TARGET_WAITKIND_STOPPED)
return signal_pid;
current_inferior->last_resume_kind = resume_stop;
current_inferior->last_status = last_status;
}
while (last_status.value.sig != GDB_SIGNAL_TRAP);
return signal_pid;
}
/* Wait till we are at 1st instruction in program, return new pid
(assuming success). */
last_ptid = mywait (pid_to_ptid (signal_pid), &last_status, 0, 0);
if (last_status.kind != TARGET_WAITKIND_EXITED
&& last_status.kind != TARGET_WAITKIND_SIGNALLED)
{
current_inferior->last_resume_kind = resume_stop;
current_inferior->last_status = last_status;
}
return signal_pid;
}
static int
attach_inferior (int pid)
{
/* myattach should return -1 if attaching is unsupported,
0 if it succeeded, and call error() otherwise. */
if (myattach (pid) != 0)
return -1;
fprintf (stderr, "Attached; pid = %d\n", pid);
fflush (stderr);
/* FIXME - It may be that we should get the SIGNAL_PID from the
attach function, so that it can be the main thread instead of
whichever we were told to attach to. */
signal_pid = pid;
/* Clear this so the backend doesn't get confused, thinking
CONT_THREAD died, and it needs to resume all threads. */
cont_thread = null_ptid;
if (!non_stop)
{
last_ptid = mywait (pid_to_ptid (pid), &last_status, 0, 0);
/* GDB knows to ignore the first SIGSTOP after attaching to a running
process using the "attach" command, but this is different; it's
just using "target remote". Pretend it's just starting up. */
if (last_status.kind == TARGET_WAITKIND_STOPPED
&& last_status.value.sig == GDB_SIGNAL_STOP)
last_status.value.sig = GDB_SIGNAL_TRAP;
current_inferior->last_resume_kind = resume_stop;
current_inferior->last_status = last_status;
}
return 0;
}
extern int remote_debug;
/* Decode a qXfer read request. Return 0 if everything looks OK,
or -1 otherwise. */
static int
decode_xfer_read (char *buf, CORE_ADDR *ofs, unsigned int *len)
{
/* After the read marker and annex, qXfer looks like a
traditional 'm' packet. */
decode_m_packet (buf, ofs, len);
return 0;
}
static int
decode_xfer (char *buf, char **object, char **rw, char **annex, char **offset)
{
/* Extract and NUL-terminate the object. */
*object = buf;
while (*buf && *buf != ':')
buf++;
if (*buf == '\0')
return -1;
*buf++ = 0;
/* Extract and NUL-terminate the read/write action. */
*rw = buf;
while (*buf && *buf != ':')
buf++;
if (*buf == '\0')
return -1;
*buf++ = 0;
/* Extract and NUL-terminate the annex. */
*annex = buf;
while (*buf && *buf != ':')
buf++;
if (*buf == '\0')
return -1;
*buf++ = 0;
*offset = buf;
return 0;
}
/* Write the response to a successful qXfer read. Returns the
length of the (binary) data stored in BUF, corresponding
to as much of DATA/LEN as we could fit. IS_MORE controls
the first character of the response. */
static int
write_qxfer_response (char *buf, const void *data, int len, int is_more)
{
int out_len;
if (is_more)
buf[0] = 'm';
else
buf[0] = 'l';
return remote_escape_output (data, len, (unsigned char *) buf + 1, &out_len,
PBUFSIZ - 2) + 1;
}
/* Handle btrace enabling. */
static const char *
handle_btrace_enable (struct thread_info *thread)
{
if (thread->btrace != NULL)
return "E.Btrace already enabled.";
thread->btrace = target_enable_btrace (thread->entry.id);
if (thread->btrace == NULL)
return "E.Could not enable btrace.";
return NULL;
}
/* Handle btrace disabling. */
static const char *
handle_btrace_disable (struct thread_info *thread)
{
if (thread->btrace == NULL)
return "E.Branch tracing not enabled.";
if (target_disable_btrace (thread->btrace) != 0)
return "E.Could not disable branch tracing.";
thread->btrace = NULL;
return NULL;
}
/* Handle the "Qbtrace" packet. */
static int
handle_btrace_general_set (char *own_buf)
{
struct thread_info *thread;
const char *err;
char *op;
if (strncmp ("Qbtrace:", own_buf, strlen ("Qbtrace:")) != 0)
return 0;
op = own_buf + strlen ("Qbtrace:");
if (!target_supports_btrace ())
{
strcpy (own_buf, "E.Target does not support branch tracing.");
return -1;
}
if (ptid_equal (general_thread, null_ptid)
|| ptid_equal (general_thread, minus_one_ptid))
{
strcpy (own_buf, "E.Must select a single thread.");
return -1;
}
thread = find_thread_ptid (general_thread);
if (thread == NULL)
{
strcpy (own_buf, "E.No such thread.");
return -1;
}
err = NULL;
if (strcmp (op, "bts") == 0)
err = handle_btrace_enable (thread);
else if (strcmp (op, "off") == 0)
err = handle_btrace_disable (thread);
else
err = "E.Bad Qbtrace operation. Use bts or off.";
if (err != 0)
strcpy (own_buf, err);
else
write_ok (own_buf);
return 1;
}
/* Handle all of the extended 'Q' packets. */
static void
handle_general_set (char *own_buf)
{
if (strncmp ("QPassSignals:", own_buf, strlen ("QPassSignals:")) == 0)
{
int numsigs = (int) GDB_SIGNAL_LAST, i;
const char *p = own_buf + strlen ("QPassSignals:");
CORE_ADDR cursig;
p = decode_address_to_semicolon (&cursig, p);
for (i = 0; i < numsigs; i++)
{
if (i == cursig)
{
pass_signals[i] = 1;
if (*p == '\0')
/* Keep looping, to clear the remaining signals. */
cursig = -1;
else
p = decode_address_to_semicolon (&cursig, p);
}
else
pass_signals[i] = 0;
}
strcpy (own_buf, "OK");
return;
}
if (strncmp ("QProgramSignals:", own_buf, strlen ("QProgramSignals:")) == 0)
{
int numsigs = (int) GDB_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)
{
fprintf (stderr, "[noack mode enabled]\n");
fflush (stderr);
}
noack_mode = 1;
write_ok (own_buf);
return;
}
if (strncmp (own_buf, "QNonStop:", 9) == 0)
{
char *mode = own_buf + 9;
int req = -1;
char *req_str;
if (strcmp (mode, "0") == 0)
req = 0;
else if (strcmp (mode, "1") == 0)
req = 1;
else
{
/* We don't know what this mode is, so complain to
GDB. */
fprintf (stderr, "Unknown non-stop mode requested: %s\n",
own_buf);
write_enn (own_buf);
return;
}
req_str = req ? "non-stop" : "all-stop";
if (start_non_stop (req) != 0)
{
fprintf (stderr, "Setting %s mode failed\n", req_str);
write_enn (own_buf);
return;
}
non_stop = req;
if (remote_debug)
fprintf (stderr, "[%s mode enabled]\n", req_str);
write_ok (own_buf);
return;
}
if (strncmp ("QDisableRandomization:", own_buf,
strlen ("QDisableRandomization:")) == 0)
{
char *packet = own_buf + strlen ("QDisableRandomization:");
ULONGEST setting;
unpack_varlen_hex (packet, &setting);
disable_randomization = setting;
if (remote_debug)
{
if (disable_randomization)
fprintf (stderr, "[address space randomization disabled]\n");
else
fprintf (stderr, "[address space randomization enabled]\n");
}
write_ok (own_buf);
return;
}
if (target_supports_tracepoints ()
&& handle_tracepoint_general_set (own_buf))
return;
if (strncmp ("QAgent:", own_buf, strlen ("QAgent:")) == 0)
{
char *mode = own_buf + strlen ("QAgent:");
int req = 0;
if (strcmp (mode, "0") == 0)
req = 0;
else if (strcmp (mode, "1") == 0)
req = 1;
else
{
/* We don't know what this value is, so complain to GDB. */
sprintf (own_buf, "E.Unknown QAgent value");
return;
}
/* Update the flag. */
use_agent = req;
if (remote_debug)
fprintf (stderr, "[%s agent]\n", req ? "Enable" : "Disable");
write_ok (own_buf);
return;
}
if (handle_btrace_general_set (own_buf))
return;
/* Otherwise we didn't know what packet it was. Say we didn't
understand it. */
own_buf[0] = 0;
}
static const char *
get_features_xml (const char *annex)
{
const struct target_desc *desc = current_target_desc ();
/* `desc->xmltarget' defines what to return when looking for the
"target.xml" file. Its contents can either be verbatim XML code
(prefixed with a '@') or else the name of the actual XML file to
be used in place of "target.xml".
This variable is set up from the auto-generated
init_registers_... routine for the current target. */
if (desc->xmltarget != NULL && strcmp (annex, "target.xml") == 0)
{
if (*desc->xmltarget == '@')
return desc->xmltarget + 1;
else
annex = desc->xmltarget;
}
#ifdef USE_XML
{
extern const char *const xml_builtin[][2];
int i;
/* Look for the annex. */
for (i = 0; xml_builtin[i][0] != NULL; i++)
if (strcmp (annex, xml_builtin[i][0]) == 0)
break;
if (xml_builtin[i][0] != NULL)
return xml_builtin[i][1];
}
#endif
return NULL;
}
void
monitor_show_help (void)
{
monitor_output ("The following monitor commands are supported:\n");
monitor_output (" set debug <0|1>\n");
monitor_output (" Enable general debugging messages\n");
monitor_output (" set debug-hw-points <0|1>\n");
monitor_output (" Enable h/w breakpoint/watchpoint debugging messages\n");
monitor_output (" set remote-debug <0|1>\n");
monitor_output (" Enable remote protocol debugging messages\n");
monitor_output (" set debug-format option1[,option2,...]\n");
monitor_output (" Add additional information to debugging messages\n");
monitor_output (" Options: all, none");
#ifdef HAVE_GETTIMEOFDAY
monitor_output (", timestamp");
#endif
monitor_output ("\n");
monitor_output (" exit\n");
monitor_output (" Quit GDBserver\n");
}
/* 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.
E.g., when GDB reads memory from a traceframe, a first request may
be served from a memory block that does not cover the whole request
length. A following request gets the rest served from either
another block (of the same traceframe) or from the read-only
regions. */
static int
gdb_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
{
int res;
if (current_traceframe >= 0)
{
ULONGEST nbytes;
ULONGEST length = len;
if (traceframe_read_mem (current_traceframe,
memaddr, myaddr, len, &nbytes))
return -1;
/* Data read from trace buffer, we're done. */
if (nbytes > 0)
return nbytes;
if (!in_readonly_region (memaddr, length))
return -1;
/* Otherwise we have a valid readonly case, fall through. */
/* (assume no half-trace half-real blocks for now) */
}
res = prepare_to_access_memory ();
if (res == 0)
{
res = read_inferior_memory (memaddr, myaddr, len);
done_accessing_memory ();
return res == 0 ? len : -1;
}
else
return -1;
}
/* Write trace frame or inferior memory. Actually, writing to trace
frames is forbidden. */
static int
gdb_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
{
if (current_traceframe >= 0)
return EIO;
else
{
int ret;
ret = prepare_to_access_memory ();
if (ret == 0)
{
ret = write_inferior_memory (memaddr, myaddr, len);
done_accessing_memory ();
}
return ret;
}
}
/* Subroutine of handle_search_memory to simplify it. */
static int
handle_search_memory_1 (CORE_ADDR start_addr, CORE_ADDR search_space_len,
gdb_byte *pattern, unsigned pattern_len,
gdb_byte *search_buf,
unsigned chunk_size, unsigned search_buf_size,
CORE_ADDR *found_addrp)
{
/* Prime the search buffer. */
if (gdb_read_memory (start_addr, search_buf, search_buf_size)
!= search_buf_size)
{
warning ("Unable to access %ld bytes of target "
"memory at 0x%lx, halting search.",
(long) search_buf_size, (long) start_addr);
return -1;
}
/* Perform the search.
The loop is kept simple by allocating [N + pattern-length - 1] bytes.
When we've scanned N bytes we copy the trailing bytes to the start and
read in another N bytes. */
while (search_space_len >= pattern_len)
{
gdb_byte *found_ptr;
unsigned nr_search_bytes = (search_space_len < search_buf_size
? search_space_len
: search_buf_size);
found_ptr = memmem (search_buf, nr_search_bytes, pattern, pattern_len);
if (found_ptr != NULL)
{
CORE_ADDR found_addr = start_addr + (found_ptr - search_buf);
*found_addrp = found_addr;
return 1;
}
/* Not found in this chunk, skip to next chunk. */
/* Don't let search_space_len wrap here, it's unsigned. */
if (search_space_len >= chunk_size)
search_space_len -= chunk_size;
else
search_space_len = 0;
if (search_space_len >= pattern_len)
{
unsigned keep_len = search_buf_size - chunk_size;
CORE_ADDR read_addr = start_addr + chunk_size + keep_len;
int nr_to_read;
/* Copy the trailing part of the previous iteration to the front
of the buffer for the next iteration. */
memcpy (search_buf, search_buf + chunk_size, keep_len);
nr_to_read = (search_space_len - keep_len < chunk_size
? search_space_len - keep_len
: chunk_size);
if (gdb_read_memory (read_addr, search_buf + keep_len,
nr_to_read) != search_buf_size)
{
warning ("Unable to access %ld bytes of target memory "
"at 0x%lx, halting search.",
(long) nr_to_read, (long) read_addr);
return -1;
}
start_addr += chunk_size;
}
}
/* Not found. */
return 0;
}
/* Handle qSearch:memory packets. */
static void
handle_search_memory (char *own_buf, int packet_len)
{
CORE_ADDR start_addr;
CORE_ADDR search_space_len;
gdb_byte *pattern;
unsigned int pattern_len;
/* NOTE: also defined in find.c testcase. */
#define SEARCH_CHUNK_SIZE 16000
const unsigned chunk_size = SEARCH_CHUNK_SIZE;
/* Buffer to hold memory contents for searching. */
gdb_byte *search_buf;
unsigned search_buf_size;
int found;
CORE_ADDR found_addr;
int cmd_name_len = sizeof ("qSearch:memory:") - 1;
pattern = malloc (packet_len);
if (pattern == NULL)
{
error ("Unable to allocate memory to perform the search");
strcpy (own_buf, "E00");
return;
}
if (decode_search_memory_packet (own_buf + cmd_name_len,
packet_len - cmd_name_len,
&start_addr, &search_space_len,
pattern, &pattern_len) < 0)
{
free (pattern);
error ("Error in parsing qSearch:memory packet");
strcpy (own_buf, "E00");
return;
}
search_buf_size = chunk_size + pattern_len - 1;
/* No point in trying to allocate a buffer larger than the search space. */
if (search_space_len < search_buf_size)
search_buf_size = search_space_len;
search_buf = malloc (search_buf_size);
if (search_buf == NULL)
{
free (pattern);
error ("Unable to allocate memory to perform the search");
strcpy (own_buf, "E00");
return;
}
found = handle_search_memory_1 (start_addr, search_space_len,
pattern, pattern_len,
search_buf, chunk_size, search_buf_size,
&found_addr);
if (found > 0)
sprintf (own_buf, "1,%lx", (long) found_addr);
else if (found == 0)
strcpy (own_buf, "0");
else
strcpy (own_buf, "E00");
free (search_buf);
free (pattern);
}
#define require_running(BUF) \
if (!target_running ()) \
{ \
write_enn (BUF); \
return; \
}
/* Parse options to --debug-format= and "monitor set debug-format".
ARG is the text after "--debug-format=" or "monitor set debug-format".
IS_MONITOR is non-zero if we're invoked via "monitor set debug-format".
This triggers calls to monitor_output.
The result is NULL if all options were parsed ok, otherwise an error
message which the caller must free.
N.B. These commands affect all debug format settings, they are not
cumulative. If a format is not specified, it is turned off.
However, we don't go to extra trouble with things like
"monitor set debug-format all,none,timestamp".
Instead we just parse them one at a time, in order.
The syntax for "monitor set debug" we support here is not identical
to gdb's "set debug foo on|off" because we also use this function to
parse "--debug-format=foo,bar". */
static char *
parse_debug_format_options (const char *arg, int is_monitor)
{
VEC (char_ptr) *options;
int ix;
char *option;
/* First turn all debug format options off. */
debug_timestamp = 0;
/* First remove leading spaces, for "monitor set debug-format". */
while (isspace (*arg))
++arg;
options = delim_string_to_char_ptr_vec (arg, ',');
for (ix = 0; VEC_iterate (char_ptr, options, ix, option); ++ix)
{
if (strcmp (option, "all") == 0)
{
debug_timestamp = 1;
if (is_monitor)
monitor_output ("All extra debug format options enabled.\n");
}
else if (strcmp (option, "none") == 0)
{
debug_timestamp = 0;
if (is_monitor)
monitor_output ("All extra debug format options disabled.\n");
}
#ifdef HAVE_GETTIMEOFDAY
else if (strcmp (option, "timestamp") == 0)
{
debug_timestamp = 1;
if (is_monitor)
monitor_output ("Timestamps will be added to debug output.\n");
}
#endif
else if (*option == '\0')
{
/* An empty option, e.g., "--debug-format=foo,,bar", is ignored. */
continue;
}
else
{
char *msg = xstrprintf ("Unknown debug-format argument: \"%s\"\n",
option);
free_char_ptr_vec (options);
return msg;
}
}
free_char_ptr_vec (options);
return NULL;
}
/* Handle monitor commands not handled by target-specific handlers. */
static void
handle_monitor_command (char *mon, char *own_buf)
{
if (strcmp (mon, "set debug 1") == 0)
{
debug_threads = 1;
monitor_output ("Debug output enabled.\n");
}
else if (strcmp (mon, "set debug 0") == 0)
{
debug_threads = 0;
monitor_output ("Debug output disabled.\n");
}
else if (strcmp (mon, "set debug-hw-points 1") == 0)
{
debug_hw_points = 1;
monitor_output ("H/W point debugging output enabled.\n");
}
else if (strcmp (mon, "set debug-hw-points 0") == 0)
{
debug_hw_points = 0;
monitor_output ("H/W point debugging output disabled.\n");
}
else if (strcmp (mon, "set remote-debug 1") == 0)
{
remote_debug = 1;
monitor_output ("Protocol debug output enabled.\n");
}
else if (strcmp (mon, "set remote-debug 0") == 0)
{
remote_debug = 0;
monitor_output ("Protocol debug output disabled.\n");
}
else if (strncmp (mon, "set debug-format ",
sizeof ("set debug-format ") - 1) == 0)
{
char *error_msg
= parse_debug_format_options (mon + sizeof ("set debug-format ") - 1,
1);
if (error_msg != NULL)
{
monitor_output (error_msg);
monitor_show_help ();
write_enn (own_buf);
xfree (error_msg);
}
}
else if (strcmp (mon, "help") == 0)
monitor_show_help ();
else if (strcmp (mon, "exit") == 0)
exit_requested = 1;
else
{
monitor_output ("Unknown monitor command.\n\n");
monitor_show_help ();
write_enn (own_buf);
}
}
/* Associates a callback with each supported qXfer'able object. */
struct qxfer
{
/* The object this handler handles. */
const char *object;
/* Request that the target transfer up to LEN 8-bit bytes of the
target's OBJECT. The OFFSET, for a seekable object, specifies
the starting point. The ANNEX can be used to provide additional
data-specific information to the target.
Return the number of bytes actually transfered, zero when no
further transfer is possible, -1 on error, -2 when the transfer
is not supported, and -3 on a verbose error message that should
be preserved. Return of a positive value smaller than LEN does
not indicate the end of the object, only the end of the transfer.
One, and only one, of readbuf or writebuf must be non-NULL. */
int (*xfer) (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len);
};
/* Handle qXfer:auxv:read. */
static int
handle_qxfer_auxv (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
if (the_target->read_auxv == NULL || writebuf != NULL)
return -2;
if (annex[0] != '\0' || !target_running ())
return -1;
return (*the_target->read_auxv) (offset, readbuf, len);
}
/* Handle qXfer:features:read. */
static int
handle_qxfer_features (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
const char *document;
size_t total_len;
if (writebuf != NULL)
return -2;
if (!target_running ())
return -1;
/* Grab the correct annex. */
document = get_features_xml (annex);
if (document == NULL)
return -1;
total_len = strlen (document);
if (offset > total_len)
return -1;
if (offset + len > total_len)
len = total_len - offset;
memcpy (readbuf, document + offset, len);
return len;
}
/* Worker routine for handle_qxfer_libraries.
Add to the length pointed to by ARG a conservative estimate of the
length needed to transmit the file name of INF. */
static void
accumulate_file_name_length (struct inferior_list_entry *inf, void *arg)
{
struct dll_info *dll = (struct dll_info *) inf;
unsigned int *total_len = arg;
/* Over-estimate the necessary memory. Assume that every character
in the library name must be escaped. */
*total_len += 128 + 6 * strlen (dll->name);
}
/* Worker routine for handle_qxfer_libraries.
Emit the XML to describe the library in INF. */
static void
emit_dll_description (struct inferior_list_entry *inf, void *arg)
{
struct dll_info *dll = (struct dll_info *) inf;
char **p_ptr = arg;
char *p = *p_ptr;
char *name;
strcpy (p, " <library name=\"");
p = p + strlen (p);
name = xml_escape_text (dll->name);
strcpy (p, name);
free (name);
p = p + strlen (p);
strcpy (p, "\"><segment address=\"");
p = p + strlen (p);
sprintf (p, "0x%lx", (long) dll->base_addr);
p = p + strlen (p);
strcpy (p, "\"/></library>\n");
p = p + strlen (p);
*p_ptr = p;
}
/* Handle qXfer:libraries:read. */
static int
handle_qxfer_libraries (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
unsigned int total_len;
char *document, *p;
if (writebuf != NULL)
return -2;
if (annex[0] != '\0' || !target_running ())
return -1;
total_len = 64;
for_each_inferior_with_data (&all_dlls, accumulate_file_name_length,
&total_len);
document = malloc (total_len);
if (document == NULL)
return -1;
strcpy (document, "<library-list>\n");
p = document + strlen (document);
for_each_inferior_with_data (&all_dlls, emit_dll_description, &p);
strcpy (p, "</library-list>\n");
total_len = strlen (document);
if (offset > total_len)
{
free (document);
return -1;
}
if (offset + len > total_len)
len = total_len - offset;
memcpy (readbuf, document + offset, len);
free (document);
return len;
}
/* Handle qXfer:libraries-svr4:read. */
static int
handle_qxfer_libraries_svr4 (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
if (writebuf != NULL)
return -2;
if (!target_running () || the_target->qxfer_libraries_svr4 == NULL)
return -1;
return the_target->qxfer_libraries_svr4 (annex, readbuf, writebuf, offset, len);
}
/* Handle qXfer:osadata:read. */
static int
handle_qxfer_osdata (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
if (the_target->qxfer_osdata == NULL || writebuf != NULL)
return -2;
return (*the_target->qxfer_osdata) (annex, readbuf, NULL, offset, len);
}
/* Handle qXfer:siginfo:read and qXfer:siginfo:write. */
static int
handle_qxfer_siginfo (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
if (the_target->qxfer_siginfo == NULL)
return -2;
if (annex[0] != '\0' || !target_running ())
return -1;
return (*the_target->qxfer_siginfo) (annex, readbuf, writebuf, offset, len);
}
/* Handle qXfer:spu:read and qXfer:spu:write. */
static int
handle_qxfer_spu (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
if (the_target->qxfer_spu == NULL)
return -2;
if (!target_running ())
return -1;
return (*the_target->qxfer_spu) (annex, readbuf, writebuf, offset, len);
}
/* Handle qXfer:statictrace:read. */
static int
handle_qxfer_statictrace (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
ULONGEST nbytes;
if (writebuf != NULL)
return -2;
if (annex[0] != '\0' || !target_running () || current_traceframe == -1)
return -1;
if (traceframe_read_sdata (current_traceframe, offset,
readbuf, len, &nbytes))
return -1;
return nbytes;
}
/* Helper for handle_qxfer_threads_proper.
Emit the XML to describe the thread of INF. */
static void
handle_qxfer_threads_worker (struct inferior_list_entry *inf, void *arg)
{
struct thread_info *thread = (struct thread_info *) inf;
struct buffer *buffer = arg;
ptid_t ptid = thread_to_gdb_id (thread);
char ptid_s[100];
int core = target_core_of_thread (ptid);
char core_s[21];
write_ptid (ptid_s, ptid);
if (core != -1)
{
sprintf (core_s, "%d", core);
buffer_xml_printf (buffer, "<thread id=\"%s\" core=\"%s\"/>\n",
ptid_s, core_s);
}
else
{
buffer_xml_printf (buffer, "<thread id=\"%s\"/>\n",
ptid_s);
}
}
/* Helper for handle_qxfer_threads. */
static void
handle_qxfer_threads_proper (struct buffer *buffer)
{
buffer_grow_str (buffer, "<threads>\n");
for_each_inferior_with_data (&all_threads, handle_qxfer_threads_worker,
buffer);
buffer_grow_str0 (buffer, "</threads>\n");
}
/* Handle qXfer:threads:read. */
static int
handle_qxfer_threads (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
static char *result = 0;
static unsigned int result_length = 0;
if (writebuf != NULL)
return -2;
if (!target_running () || annex[0] != '\0')
return -1;
if (offset == 0)
{
struct buffer buffer;
/* When asked for data at offset 0, generate everything and store into
'result'. Successive reads will be served off 'result'. */
if (result)
free (result);
buffer_init (&buffer);
handle_qxfer_threads_proper (&buffer);
result = buffer_finish (&buffer);
result_length = strlen (result);
buffer_free (&buffer);
}
if (offset >= result_length)
{
/* We're out of data. */
free (result);
result = NULL;
result_length = 0;
return 0;
}
if (len > result_length - offset)
len = result_length - offset;
memcpy (readbuf, result + offset, len);
return len;
}
/* Handle qXfer:traceframe-info:read. */
static int
handle_qxfer_traceframe_info (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
static char *result = 0;
static unsigned int result_length = 0;
if (writebuf != NULL)
return -2;
if (!target_running () || annex[0] != '\0' || current_traceframe == -1)
return -1;
if (offset == 0)
{
struct buffer buffer;
/* When asked for data at offset 0, generate everything and
store into 'result'. Successive reads will be served off
'result'. */
free (result);
buffer_init (&buffer);
traceframe_read_info (current_traceframe, &buffer);
result = buffer_finish (&buffer);
result_length = strlen (result);
buffer_free (&buffer);
}
if (offset >= result_length)
{
/* We're out of data. */
free (result);
result = NULL;
result_length = 0;
return 0;
}
if (len > result_length - offset)
len = result_length - offset;
memcpy (readbuf, result + offset, len);
return len;
}
/* Handle qXfer:fdpic:read. */
static int
handle_qxfer_fdpic (const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
{
if (the_target->read_loadmap == NULL)
return -2;
if (!target_running ())
return -1;
return (*the_target->read_loadmap) (annex, offset, readbuf, len);
}
/* Handle qXfer:btrace:read. */
static int
handle_qxfer_btrace (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
static struct buffer cache;
struct thread_info *thread;
int type, result;
if (the_target->read_btrace == NULL || writebuf != NULL)
return -2;
if (!target_running ())
return -1;
if (ptid_equal (general_thread, null_ptid)
|| ptid_equal (general_thread, minus_one_ptid))
{
strcpy (own_buf, "E.Must select a single thread.");
return -3;
}
thread = find_thread_ptid (general_thread);
if (thread == NULL)
{
strcpy (own_buf, "E.No such thread.");
return -3;
}
if (thread->btrace == NULL)
{
strcpy (own_buf, "E.Btrace not enabled.");
return -3;
}
if (strcmp (annex, "all") == 0)
type = BTRACE_READ_ALL;
else if (strcmp (annex, "new") == 0)
type = BTRACE_READ_NEW;
else if (strcmp (annex, "delta") == 0)
type = BTRACE_READ_DELTA;
else
{
strcpy (own_buf, "E.Bad annex.");
return -3;
}
if (offset == 0)
{
buffer_free (&cache);
result = target_read_btrace (thread->btrace, &cache, type);
if (result != 0)
{
memcpy (own_buf, cache.buffer, cache.used_size);
return -3;
}
}
else if (offset > cache.used_size)
{
buffer_free (&cache);
return -3;
}
if (len > cache.used_size - offset)
len = cache.used_size - offset;
memcpy (readbuf, cache.buffer + offset, len);
return len;
}
static const struct qxfer qxfer_packets[] =
{
{ "auxv", handle_qxfer_auxv },
{ "btrace", handle_qxfer_btrace },
{ "fdpic", handle_qxfer_fdpic},
{ "features", handle_qxfer_features },
{ "libraries", handle_qxfer_libraries },
{ "libraries-svr4", handle_qxfer_libraries_svr4 },
{ "osdata", handle_qxfer_osdata },
{ "siginfo", handle_qxfer_siginfo },
{ "spu", handle_qxfer_spu },
{ "statictrace", handle_qxfer_statictrace },
{ "threads", handle_qxfer_threads },
{ "traceframe-info", handle_qxfer_traceframe_info },
};
static int
handle_qxfer (char *own_buf, int packet_len, int *new_packet_len_p)
{
int i;
char *object;
char *rw;
char *annex;
char *offset;
if (strncmp (own_buf, "qXfer:", 6) != 0)
return 0;
/* Grab the object, r/w and annex. */
if (decode_xfer (own_buf + 6, &object, &rw, &annex, &offset) < 0)
{
write_enn (own_buf);
return 1;
}
for (i = 0;
i < sizeof (qxfer_packets) / sizeof (qxfer_packets[0]);
i++)
{
const struct qxfer *q = &qxfer_packets[i];
if (strcmp (object, q->object) == 0)
{
if (strcmp (rw, "read") == 0)
{
unsigned char *data;
int n;
CORE_ADDR ofs;
unsigned int len;
/* Grab the offset and length. */
if (decode_xfer_read (offset, &ofs, &len) < 0)
{
write_enn (own_buf);
return 1;
}
/* Read one extra byte, as an indicator of whether there is
more. */
if (len > PBUFSIZ - 2)
len = PBUFSIZ - 2;
data = malloc (len + 1);
if (data == NULL)
{
write_enn (own_buf);
return 1;
}
n = (*q->xfer) (annex, data, NULL, ofs, len + 1);
if (n == -2)
{
free (data);
return 0;
}
else if (n == -3)
{
/* Preserve error message. */
}
else if (n < 0)
write_enn (own_buf);
else if (n > len)
*new_packet_len_p = write_qxfer_response (own_buf, data, len, 1);
else
*new_packet_len_p = write_qxfer_response (own_buf, data, n, 0);
free (data);
return 1;
}
else if (strcmp (rw, "write") == 0)
{
int n;
unsigned int len;
CORE_ADDR ofs;
unsigned char *data;
strcpy (own_buf, "E00");
data = malloc (packet_len - (offset - own_buf));
if (data == NULL)
{
write_enn (own_buf);
return 1;
}
if (decode_xfer_write (offset, packet_len - (offset - own_buf),
&ofs, &len, data) < 0)
{
free (data);
write_enn (own_buf);
return 1;
}
n = (*q->xfer) (annex, NULL, data, ofs, len);
if (n == -2)
{
free (data);
return 0;
}
else if (n == -3)
{
/* Preserve error message. */
}
else if (n < 0)
write_enn (own_buf);
else
sprintf (own_buf, "%x", n);
free (data);
return 1;
}
return 0;
}
}
return 0;
}
/* Table used by the crc32 function to calcuate the checksum. */
static unsigned int crc32_table[256] =
{0, 0};
/* Compute 32 bit CRC from inferior memory.
On success, return 32 bit CRC.
On failure, return (unsigned long long) -1. */
static unsigned long long
crc32 (CORE_ADDR base, int len, unsigned int crc)
{
if (!crc32_table[1])
{
/* Initialize the CRC table and the decoding table. */
int i, j;
unsigned int c;
for (i = 0; i < 256; i++)
{
for (c = i << 24, j = 8; j > 0; --j)
c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1);
crc32_table[i] = c;
}
}
while (len--)
{
unsigned char byte = 0;
/* Return failure if memory read fails. */
if (read_inferior_memory (base, &byte, 1) != 0)
return (unsigned long long) -1;
crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ byte) & 255];
base++;
}
return (unsigned long long) crc;
}
/* Handle all of the extended 'q' packets. */
void
handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
{
static struct inferior_list_entry *thread_ptr;
/* Reply the current thread id. */
if (strcmp ("qC", own_buf) == 0 && !disable_packet_qC)
{
ptid_t gdb_id;
require_running (own_buf);
if (!ptid_equal (general_thread, null_ptid)
&& !ptid_equal (general_thread, minus_one_ptid))
gdb_id = general_thread;
else
{
thread_ptr = get_first_inferior (&all_threads);
gdb_id = thread_to_gdb_id ((struct thread_info *)thread_ptr);
}
sprintf (own_buf, "QC");
own_buf += 2;
write_ptid (own_buf, gdb_id);
return;
}
if (strcmp ("qSymbol::", own_buf) == 0)
{
/* GDB is suggesting new symbols have been loaded. This may
mean a new shared library has been detected as loaded, so
take the opportunity to check if breakpoints we think are
inserted, still are. Note that it isn't guaranteed that
we'll see this when a shared library is loaded, and nor will
we see this for unloads (although breakpoints in unloaded
libraries shouldn't trigger), as GDB may not find symbols for
the library at all. We also re-validate breakpoints when we
see a second GDB breakpoint for the same address, and or when
we access breakpoint shadows. */
validate_breakpoints ();
if (target_supports_tracepoints ())
tracepoint_look_up_symbols ();
if (target_running () && the_target->look_up_symbols != NULL)
(*the_target->look_up_symbols) ();
strcpy (own_buf, "OK");
return;
}
if (!disable_packet_qfThreadInfo)
{
if (strcmp ("qfThreadInfo", own_buf) == 0)
{
ptid_t gdb_id;
require_running (own_buf);
thread_ptr = get_first_inferior (&all_threads);
*own_buf++ = 'm';
gdb_id = thread_to_gdb_id ((struct thread_info *)thread_ptr);
write_ptid (own_buf, gdb_id);
thread_ptr = thread_ptr->next;
return;
}
if (strcmp ("qsThreadInfo", own_buf) == 0)
{
ptid_t gdb_id;
require_running (own_buf);
if (thread_ptr != NULL)
{
*own_buf++ = 'm';
gdb_id = thread_to_gdb_id ((struct thread_info *)thread_ptr);
write_ptid (own_buf, gdb_id);
thread_ptr = thread_ptr->next;
return;
}
else
{
sprintf (own_buf, "l");
return;
}
}
}
if (the_target->read_offsets != NULL
&& strcmp ("qOffsets", own_buf) == 0)
{
CORE_ADDR text, data;
require_running (own_buf);
if (the_target->read_offsets (&text, &data))
sprintf (own_buf, "Text=%lX;Data=%lX;Bss=%lX",
(long)text, (long)data, (long)data);
else
write_enn (own_buf);
return;
}
/* Protocol features query. */
if (strncmp ("qSupported", own_buf, 10) == 0
&& (own_buf[10] == ':' || own_buf[10] == '\0'))
{
char *p = &own_buf[10];
int gdb_supports_qRelocInsn = 0;
/* Start processing qSupported packet. */
target_process_qsupported (NULL);
/* Process each feature being provided by GDB. The first
feature will follow a ':', and latter features will follow
';'. */
if (*p == ':')
{
char **qsupported = NULL;
int count = 0;
int i;
/* Two passes, to avoid nested strtok calls in
target_process_qsupported. */
for (p = strtok (p + 1, ";");
p != NULL;
p = strtok (NULL, ";"))
{
count++;
qsupported = xrealloc (qsupported, count * sizeof (char *));
qsupported[count - 1] = xstrdup (p);
}
for (i = 0; i < count; i++)
{
p = qsupported[i];
if (strcmp (p, "multiprocess+") == 0)
{
/* GDB supports and wants multi-process support if
possible. */
if (target_supports_multi_process ())
multi_process = 1;
}
else if (strcmp (p, "qRelocInsn+") == 0)
{
/* GDB supports relocate instruction requests. */
gdb_supports_qRelocInsn = 1;
}
else
target_process_qsupported (p);
free (p);
}
free (qsupported);
}
sprintf (own_buf,
"PacketSize=%x;QPassSignals+;QProgramSignals+",
PBUFSIZ - 1);
if (the_target->qxfer_libraries_svr4 != NULL)
strcat (own_buf, ";qXfer:libraries-svr4:read+"
";augmented-libraries-svr4-read+");
else
{
/* We do not have any hook to indicate whether the non-SVR4 target
backend supports qXfer:libraries:read, so always report it. */
strcat (own_buf, ";qXfer:libraries:read+");
}
if (the_target->read_auxv != NULL)
strcat (own_buf, ";qXfer:auxv:read+");
if (the_target->qxfer_spu != NULL)
strcat (own_buf, ";qXfer:spu:read+;qXfer:spu:write+");
if (the_target->qxfer_siginfo != NULL)
strcat (own_buf, ";qXfer:siginfo:read+;qXfer:siginfo:write+");
if (the_target->read_loadmap != NULL)
strcat (own_buf, ";qXfer:fdpic:read+");
/* We always report qXfer:features:read, as targets may
install XML files on a subsequent call to arch_setup.
If we reported to GDB on startup that we don't support
qXfer:feature:read at all, we will never be re-queried. */
strcat (own_buf, ";qXfer:features:read+");
if (transport_is_reliable)
strcat (own_buf, ";QStartNoAckMode+");
if (the_target->qxfer_osdata != NULL)
strcat (own_buf, ";qXfer:osdata:read+");
if (target_supports_multi_process ())
strcat (own_buf, ";multiprocess+");
if (target_supports_non_stop ())
strcat (own_buf, ";QNonStop+");
if (target_supports_disable_randomization ())
strcat (own_buf, ";QDisableRandomization+");
strcat (own_buf, ";qXfer:threads:read+");
if (target_supports_tracepoints ())
{
strcat (own_buf, ";ConditionalTracepoints+");
strcat (own_buf, ";TraceStateVariables+");
strcat (own_buf, ";TracepointSource+");
strcat (own_buf, ";DisconnectedTracing+");
if (gdb_supports_qRelocInsn && target_supports_fast_tracepoints ())
strcat (own_buf, ";FastTracepoints+");
strcat (own_buf, ";StaticTracepoints+");
strcat (own_buf, ";InstallInTrace+");
strcat (own_buf, ";qXfer:statictrace:read+");
strcat (own_buf, ";qXfer:traceframe-info:read+");
strcat (own_buf, ";EnableDisableTracepoints+");
strcat (own_buf, ";QTBuffer:size+");
strcat (own_buf, ";tracenz+");
}
/* Support target-side breakpoint conditions and commands. */
strcat (own_buf, ";ConditionalBreakpoints+");
strcat (own_buf, ";BreakpointCommands+");
if (target_supports_agent ())
strcat (own_buf, ";QAgent+");
if (target_supports_btrace ())
{
strcat (own_buf, ";Qbtrace:bts+");
strcat (own_buf, ";Qbtrace:off+");
strcat (own_buf, ";qXfer:btrace:read+");
}
return;
}
/* Thread-local storage support. */
if (the_target->get_tls_address != NULL
&& strncmp ("qGetTLSAddr:", own_buf, 12) == 0)
{
char *p = own_buf + 12;
CORE_ADDR parts[2], address = 0;
int i, err;
ptid_t ptid = null_ptid;
require_running (own_buf);
for (i = 0; i < 3; i++)
{
char *p2;
int len;
if (p == NULL)
break;
p2 = strchr (p, ',');
if (p2)
{
len = p2 - p;
p2++;
}
else
{
len = strlen (p);
p2 = NULL;
}
if (i == 0)
ptid = read_ptid (p, NULL);
else
decode_address (&parts[i - 1], p, len);
p = p2;
}
if (p != NULL || i < 3)
err = 1;
else
{
struct thread_info *thread = find_thread_ptid (ptid);
if (thread == NULL)
err = 2;
else
err = the_target->get_tls_address (thread, parts[0], parts[1],
&address);
}
if (err == 0)
{
strcpy (own_buf, paddress(address));
return;
}
else if (err > 0)
{
write_enn (own_buf);
return;
}
/* Otherwise, pretend we do not understand this packet. */
}
/* Windows OS Thread Information Block address support. */
if (the_target->get_tib_address != NULL
&& strncmp ("qGetTIBAddr:", own_buf, 12) == 0)
{
char *annex;
int n;
CORE_ADDR tlb;
ptid_t ptid = read_ptid (own_buf + 12, &annex);
n = (*the_target->get_tib_address) (ptid, &tlb);
if (n == 1)
{
strcpy (own_buf, paddress(tlb));
return;
}
else if (n == 0)
{
write_enn (own_buf);
return;
}
return;
}
/* Handle "monitor" commands. */
if (strncmp ("qRcmd,", own_buf, 6) == 0)
{
char *mon = malloc (PBUFSIZ);
int len = strlen (own_buf + 6);
if (mon == NULL)
{
write_enn (own_buf);
return;
}
if ((len % 2) != 0
|| hex2bin (own_buf + 6, (gdb_byte *) mon, len / 2) != len / 2)
{
write_enn (own_buf);
free (mon);
return;
}
mon[len / 2] = '\0';
write_ok (own_buf);
if (the_target->handle_monitor_command == NULL
|| (*the_target->handle_monitor_command) (mon) == 0)
/* Default processing. */
handle_monitor_command (mon, own_buf);
free (mon);
return;
}
if (strncmp ("qSearch:memory:", own_buf,
sizeof ("qSearch:memory:") - 1) == 0)
{
require_running (own_buf);
handle_search_memory (own_buf, packet_len);
return;
}
if (strcmp (own_buf, "qAttached") == 0
|| strncmp (own_buf, "qAttached:", sizeof ("qAttached:") - 1) == 0)
{
struct process_info *process;
if (own_buf[sizeof ("qAttached") - 1])
{
int pid = strtoul (own_buf + sizeof ("qAttached:") - 1, NULL, 16);
process = (struct process_info *)
find_inferior_id (&all_processes, pid_to_ptid (pid));
}
else
{
require_running (own_buf);
process = current_process ();
}
if (process == NULL)
{
write_enn (own_buf);
return;
}
strcpy (own_buf, process->attached ? "1" : "0");
return;
}
if (strncmp ("qCRC:", own_buf, 5) == 0)
{
/* CRC check (compare-section). */
char *comma;
ULONGEST base;
int len;
unsigned long long crc;
require_running (own_buf);
comma = unpack_varlen_hex (own_buf + 5, &base);
if (*comma++ != ',')
{
write_enn (own_buf);
return;
}
len = strtoul (comma, NULL, 16);
crc = crc32 (base, len, 0xffffffff);
/* Check for memory failure. */
if (crc == (unsigned long long) -1)
{
write_enn (own_buf);
return;
}
sprintf (own_buf, "C%lx", (unsigned long) crc);
return;
}
if (handle_qxfer (own_buf, packet_len, new_packet_len_p))
return;
if (target_supports_tracepoints () && handle_tracepoint_query (own_buf))
return;
/* Otherwise we didn't know what packet it was. Say we didn't
understand it. */
own_buf[0] = 0;
}
static void gdb_wants_all_threads_stopped (void);
static void resume (struct thread_resume *actions, size_t n);
/* The callback that is passed to visit_actioned_threads. */
typedef int (visit_actioned_threads_callback_ftype)
(const struct thread_resume *, struct thread_info *);
/* Struct to pass data to visit_actioned_threads. */
struct visit_actioned_threads_data
{
const struct thread_resume *actions;
size_t num_actions;
visit_actioned_threads_callback_ftype *callback;
};
/* Call CALLBACK for any thread to which ACTIONS applies to. Returns
true if CALLBACK returns true. Returns false if no matching thread
is found or CALLBACK results false.
Note: This function is itself a callback for find_inferior. */
static int
visit_actioned_threads (struct inferior_list_entry *entry, void *datap)
{
struct visit_actioned_threads_data *data = datap;
const struct thread_resume *actions = data->actions;
size_t num_actions = data->num_actions;
visit_actioned_threads_callback_ftype *callback = data->callback;
size_t i;
for (i = 0; i < num_actions; i++)
{
const struct thread_resume *action = &actions[i];
if (ptid_equal (action->thread, minus_one_ptid)
|| ptid_equal (action->thread, entry->id)
|| ((ptid_get_pid (action->thread)
== ptid_get_pid (entry->id))
&& ptid_get_lwp (action->thread) == -1))
{
struct thread_info *thread = (struct thread_info *) entry;
if ((*callback) (action, thread))
return 1;
}
}
return 0;
}
/* Callback for visit_actioned_threads. If the thread has a pending
status to report, report it now. */
static int
handle_pending_status (const struct thread_resume *resumption,
struct thread_info *thread)
{
if (thread->status_pending_p)
{
thread->status_pending_p = 0;
last_status = thread->last_status;
last_ptid = thread->entry.id;
prepare_resume_reply (own_buf, last_ptid, &last_status);
return 1;
}
return 0;
}
/* Parse vCont packets. */
void
handle_v_cont (char *own_buf)
{
char *p, *q;
int n = 0, i = 0;
struct thread_resume *resume_info;
struct thread_resume default_action = {{0}};
/* Count the number of semicolons in the packet. There should be one
for every action. */
p = &own_buf[5];
while (p)
{
n++;
p++;
p = strchr (p, ';');
}
resume_info = malloc (n * sizeof (resume_info[0]));
if (resume_info == NULL)
goto err;
p = &own_buf[5];
while (*p)
{
p++;
memset (&resume_info[i], 0, sizeof resume_info[i]);
if (p[0] == 's' || p[0] == 'S')
resume_info[i].kind = resume_step;
else if (p[0] == 'r')
resume_info[i].kind = resume_step;
else if (p[0] == 'c' || p[0] == 'C')
resume_info[i].kind = resume_continue;
else if (p[0] == 't')
resume_info[i].kind = resume_stop;
else
goto err;
if (p[0] == 'S' || p[0] == 'C')
{
int sig;
sig = strtol (p + 1, &q, 16);
if (p == q)
goto err;
p = q;
if (!gdb_signal_to_host_p (sig))
goto err;
resume_info[i].sig = gdb_signal_to_host (sig);
}
else if (p[0] == 'r')
{
ULONGEST addr;
p = unpack_varlen_hex (p + 1, &addr);
resume_info[i].step_range_start = addr;
if (*p != ',')
goto err;
p = unpack_varlen_hex (p + 1, &addr);
resume_info[i].step_range_end = addr;
}
else
{
p = p + 1;
}
if (p[0] == 0)
{
resume_info[i].thread = minus_one_ptid;
default_action = resume_info[i];
/* Note: we don't increment i here, we'll overwrite this entry
the next time through. */
}
else if (p[0] == ':')
{
ptid_t ptid = read_ptid (p + 1, &q);
if (p == q)
goto err;
p = q;
if (p[0] != ';' && p[0] != 0)
goto err;
resume_info[i].thread = ptid;
i++;
}
}
if (i < n)
resume_info[i] = default_action;
/* `cont_thread' is still used in occasional places in the backend,
to implement single-thread scheduler-locking. Doesn't make sense
to set it if we see a stop request, or a wildcard action (one
with '-1' (all threads), or 'pPID.-1' (all threads of PID)). */
if (n == 1
&& !(ptid_equal (resume_info[0].thread, minus_one_ptid)
|| ptid_get_lwp (resume_info[0].thread) == -1)
&& resume_info[0].kind != resume_stop)
cont_thread = resume_info[0].thread;
else
cont_thread = minus_one_ptid;
set_desired_inferior (0);
resume (resume_info, n);
free (resume_info);
return;
err:
write_enn (own_buf);
free (resume_info);
return;
}
/* Resume target with ACTIONS, an array of NUM_ACTIONS elements. */
static void
resume (struct thread_resume *actions, size_t num_actions)
{
if (!non_stop)
{
/* Check if among the threads that GDB wants actioned, there's
one with a pending status to report. If so, skip actually
resuming/stopping and report the pending event
immediately. */
struct visit_actioned_threads_data data;
data.actions = actions;
data.num_actions = num_actions;
data.callback = handle_pending_status;
if (find_inferior (&all_threads, visit_actioned_threads, &data) != NULL)
return;
enable_async_io ();
}
(*the_target->resume) (actions, num_actions);
if (non_stop)
write_ok (own_buf);
else
{
last_ptid = mywait (minus_one_ptid, &last_status, 0, 1);
if (last_status.kind == TARGET_WAITKIND_NO_RESUMED)
{
/* No proper RSP support for this yet. At least return
error. */
sprintf (own_buf, "E.No unwaited-for children left.");
disable_async_io ();
return;
}
if (last_status.kind != TARGET_WAITKIND_EXITED
&& last_status.kind != TARGET_WAITKIND_SIGNALLED
&& last_status.kind != TARGET_WAITKIND_NO_RESUMED)
current_inferior->last_status = last_status;
/* From the client's perspective, all-stop mode always stops all
threads implicitly (and the target backend has already done
so by now). Tag all threads as "want-stopped", so we don't
resume them implicitly without the client telling us to. */
gdb_wants_all_threads_stopped ();
prepare_resume_reply (own_buf, last_ptid, &last_status);
disable_async_io ();
if (last_status.kind == TARGET_WAITKIND_EXITED
|| last_status.kind == TARGET_WAITKIND_SIGNALLED)
mourn_inferior (find_process_pid (ptid_get_pid (last_ptid)));
}
}
/* Attach to a new program. Return 1 if successful, 0 if failure. */
int
handle_v_attach (char *own_buf)
{
int pid;
pid = strtol (own_buf + 8, NULL, 16);
if (pid != 0 && attach_inferior (pid) == 0)
{
/* Don't report shared library events after attaching, even if
some libraries are preloaded. GDB will always poll the
library list. Avoids the "stopped by shared library event"
notice on the GDB side. */
dlls_changed = 0;
if (non_stop)
{
/* In non-stop, we don't send a resume reply. Stop events
will follow up using the normal notification
mechanism. */
write_ok (own_buf);
}
else
prepare_resume_reply (own_buf, last_ptid, &last_status);
return 1;
}
else
{
write_enn (own_buf);
return 0;
}
}
/* Run a new program. Return 1 if successful, 0 if failure. */
static int
handle_v_run (char *own_buf)
{
char *p, *next_p, **new_argv;
int i, new_argc;
new_argc = 0;
for (p = own_buf + strlen ("vRun;"); p && *p; p = strchr (p, ';'))
{
p++;
new_argc++;
}
new_argv = calloc (new_argc + 2, sizeof (char *));
if (new_argv == NULL)
{
write_enn (own_buf);
return 0;
}
i = 0;
for (p = own_buf + strlen ("vRun;"); *p; p = next_p)
{
next_p = strchr (p, ';');
if (next_p == NULL)
next_p = p + strlen (p);
if (i == 0 && p == next_p)
new_argv[i] = NULL;
else
{
/* FIXME: Fail request if out of memory instead of dying. */
new_argv[i] = xmalloc (1 + (next_p - p) / 2);
hex2bin (p, (gdb_byte *) new_argv[i], (next_p - p) / 2);
new_argv[i][(next_p - p) / 2] = '\0';
}
if (*next_p)
next_p++;
i++;
}
new_argv[i] = NULL;
if (new_argv[0] == NULL)
{
/* GDB didn't specify a program to run. Use the program from the
last run with the new argument list. */
if (program_argv == NULL)
{
write_enn (own_buf);
freeargv (new_argv);
return 0;
}
new_argv[0] = strdup (program_argv[0]);
if (new_argv[0] == NULL)
{
write_enn (own_buf);
freeargv (new_argv);
return 0;
}
}
/* Free the old argv and install the new one. */
freeargv (program_argv);
program_argv = new_argv;
start_inferior (program_argv);
if (last_status.kind == TARGET_WAITKIND_STOPPED)
{
prepare_resume_reply (own_buf, last_ptid, &last_status);
/* In non-stop, sending a resume reply doesn't set the general
thread, but GDB assumes a vRun sets it (this is so GDB can
query which is the main thread of the new inferior. */
if (non_stop)
general_thread = last_ptid;
return 1;
}
else
{
write_enn (own_buf);
return 0;
}
}
/* Kill process. Return 1 if successful, 0 if failure. */
int
handle_v_kill (char *own_buf)
{
int pid;
char *p = &own_buf[6];
if (multi_process)
pid = strtol (p, NULL, 16);
else
pid = signal_pid;
if (pid != 0 && kill_inferior (pid) == 0)
{
last_status.kind = TARGET_WAITKIND_SIGNALLED;
last_status.value.sig = GDB_SIGNAL_KILL;
last_ptid = pid_to_ptid (pid);
discard_queued_stop_replies (pid);
write_ok (own_buf);
return 1;
}
else
{
write_enn (own_buf);
return 0;
}
}
/* Handle all of the extended 'v' packets. */
void
handle_v_requests (char *own_buf, int packet_len, int *new_packet_len)
{
if (!disable_packet_vCont)
{
if (strncmp (own_buf, "vCont;", 6) == 0)
{
require_running (own_buf);
handle_v_cont (own_buf);
return;
}
if (strncmp (own_buf, "vCont?", 6) == 0)
{
strcpy (own_buf, "vCont;c;C;s;S;t");
if (target_supports_range_stepping ())
{
own_buf = own_buf + strlen (own_buf);
strcpy (own_buf, ";r");
}
return;
}
}
if (strncmp (own_buf, "vFile:", 6) == 0
&& handle_vFile (own_buf, packet_len, new_packet_len))
return;
if (strncmp (own_buf, "vAttach;", 8) == 0)
{
if ((!extended_protocol || !multi_process) && target_running ())
{
fprintf (stderr, "Already debugging a process\n");
write_enn (own_buf);
return;
}
handle_v_attach (own_buf);
return;
}
if (strncmp (own_buf, "vRun;", 5) == 0)
{
if ((!extended_protocol || !multi_process) && target_running ())
{
fprintf (stderr, "Already debugging a process\n");
write_enn (own_buf);
return;
}
handle_v_run (own_buf);
return;
}
if (strncmp (own_buf, "vKill;", 6) == 0)
{
if (!target_running ())
{
fprintf (stderr, "No process to kill\n");
write_enn (own_buf);
return;
}
handle_v_kill (own_buf);
return;
}
if (handle_notif_ack (own_buf, packet_len))
return;
/* Otherwise we didn't know what packet it was. Say we didn't
understand it. */
own_buf[0] = 0;
return;
}
/* Resume inferior and wait for another event. In non-stop mode,
don't really wait here, but return immediatelly to the event
loop. */
static void
myresume (char *own_buf, int step, int sig)
{
struct thread_resume resume_info[2];
int n = 0;
int valid_cont_thread;
set_desired_inferior (0);
valid_cont_thread = (!ptid_equal (cont_thread, null_ptid)
&& !ptid_equal (cont_thread, minus_one_ptid));
if (step || sig || valid_cont_thread)
{
resume_info[0].thread = current_ptid;
if (step)
resume_info[0].kind = resume_step;
else
resume_info[0].kind = resume_continue;
resume_info[0].sig = sig;
n++;
}
if (!valid_cont_thread)
{
resume_info[n].thread = minus_one_ptid;
resume_info[n].kind = resume_continue;
resume_info[n].sig = 0;
n++;
}
resume (resume_info, n);
}
/* Callback for for_each_inferior. Make a new stop reply for each
stopped thread. */
static int
queue_stop_reply_callback (struct inferior_list_entry *entry, void *arg)
{
struct thread_info *thread = (struct thread_info *) entry;
/* For now, assume targets that don't have this callback also don't
manage the thread's last_status field. */
if (the_target->thread_stopped == NULL)
{
struct vstop_notif *new_notif = xmalloc (sizeof (*new_notif));
new_notif->ptid = entry->id;
new_notif->status = thread->last_status;
/* Pass the last stop reply back to GDB, but don't notify
yet. */
notif_event_enque (&notif_stop,
(struct notif_event *) new_notif);
}
else
{
if (thread_stopped (thread))
{
if (debug_threads)
{
char *status_string
= target_waitstatus_to_string (&thread->last_status);
debug_printf ("Reporting thread %s as already stopped with %s\n",
target_pid_to_str (entry->id),
status_string);
xfree (status_string);
}
gdb_assert (thread->last_status.kind != TARGET_WAITKIND_IGNORE);
/* Pass the last stop reply back to GDB, but don't notify
yet. */
queue_stop_reply (entry->id, &thread->last_status);
}
}
return 0;
}
/* Set this inferior threads's state as "want-stopped". We won't
resume this thread until the client gives us another action for
it. */
static void
gdb_wants_thread_stopped (struct inferior_list_entry *entry)
{
struct thread_info *thread = (struct thread_info *) entry;
thread->last_resume_kind = resume_stop;
if (thread->last_status.kind == TARGET_WAITKIND_IGNORE)
{
/* Most threads are stopped implicitly (all-stop); tag that with
signal 0. */
thread->last_status.kind = TARGET_WAITKIND_STOPPED;
thread->last_status.value.sig = GDB_SIGNAL_0;
}
}
/* Set all threads' states as "want-stopped". */
static void
gdb_wants_all_threads_stopped (void)
{
for_each_inferior (&all_threads, gdb_wants_thread_stopped);
}
/* Clear the gdb_detached flag of every process. */
static void
gdb_reattached_process (struct inferior_list_entry *entry)
{
struct process_info *process = (struct process_info *) entry;
process->gdb_detached = 0;
}
/* Callback for for_each_inferior. Clear the thread's pending status
flag. */
static void
clear_pending_status_callback (struct inferior_list_entry *entry)
{
struct thread_info *thread = (struct thread_info *) entry;
thread->status_pending_p = 0;
}
/* Callback for for_each_inferior. If the thread is stopped with an
interesting event, mark it as having a pending event. */
static void
set_pending_status_callback (struct inferior_list_entry *entry)
{
struct thread_info *thread = (struct thread_info *) entry;
if (thread->last_status.kind != TARGET_WAITKIND_STOPPED
|| (thread->last_status.value.sig != GDB_SIGNAL_0
/* A breakpoint, watchpoint or finished step from a previous
GDB run isn't considered interesting for a new GDB run.
If we left those pending, the new GDB could consider them
random SIGTRAPs. This leaves out real async traps. We'd
have to peek into the (target-specific) siginfo to
distinguish those. */
&& thread->last_status.value.sig != GDB_SIGNAL_TRAP))
thread->status_pending_p = 1;
}
/* Callback for find_inferior. Return true if ENTRY (a thread) has a
pending status to report to GDB. */
static int
find_status_pending_thread_callback (struct inferior_list_entry *entry, void *data)
{
struct thread_info *thread = (struct thread_info *) entry;
return thread->status_pending_p;
}
/* Status handler for the '?' packet. */
static void
handle_status (char *own_buf)
{
/* GDB is connected, don't forward events to the target anymore. */
for_each_inferior (&all_processes, gdb_reattached_process);
/* In non-stop mode, we must send a stop reply for each stopped
thread. In all-stop mode, just send one for the first stopped
thread we find. */
if (non_stop)
{
find_inferior (&all_threads, queue_stop_reply_callback, NULL);
/* The first is sent immediatly. OK is sent if there is no
stopped thread, which is the same handling of the vStopped
packet (by design). */
notif_write_event (&notif_stop, own_buf);
}
else
{
struct inferior_list_entry *thread = NULL;
pause_all (0);
stabilize_threads ();
gdb_wants_all_threads_stopped ();
/* We can only report one status, but we might be coming out of
non-stop -- if more than one thread is stopped with
interesting events, leave events for the threads we're not
reporting now pending. They'll be reported the next time the
threads are resumed. Start by marking all interesting events
as pending. */
for_each_inferior (&all_threads, set_pending_status_callback);
/* Prefer the last thread that reported an event to GDB (even if
that was a GDB_SIGNAL_TRAP). */
if (last_status.kind != TARGET_WAITKIND_IGNORE
&& last_status.kind != TARGET_WAITKIND_EXITED
&& last_status.kind != TARGET_WAITKIND_SIGNALLED)
thread = find_inferior_id (&all_threads, last_ptid);
/* If the last event thread is not found for some reason, look
for some other thread that might have an event to report. */
if (thread == NULL)
thread = find_inferior (&all_threads,
find_status_pending_thread_callback, NULL);
/* If we're still out of luck, simply pick the first thread in
the thread list. */
if (thread == NULL)
thread = get_first_inferior (&all_threads);
if (thread != NULL)
{
struct thread_info *tp = (struct thread_info *) thread;
/* We're reporting this event, so it's no longer
pending. */
tp->status_pending_p = 0;
/* GDB assumes the current thread is the thread we're
reporting the status for. */
general_thread = thread->id;
set_desired_inferior (1);
gdb_assert (tp->last_status.kind != TARGET_WAITKIND_IGNORE);
prepare_resume_reply (own_buf, tp->entry.id, &tp->last_status);
}
else
strcpy (own_buf, "W00");
}
}
static void
gdbserver_version (void)
{
printf ("GNU gdbserver %s%s\n"
"Copyright (C) 2014 Free Software Foundation, Inc.\n"
"gdbserver is free software, covered by the "
"GNU General Public License.\n"
"This gdbserver was configured as \"%s\"\n",
PKGVERSION, version, host_name);
}
static void
gdbserver_usage (FILE *stream)
{
fprintf (stream, "Usage:\tgdbserver [OPTIONS] COMM PROG [ARGS ...]\n"
"\tgdbserver [OPTIONS] --attach COMM PID\n"
"\tgdbserver [OPTIONS] --multi COMM\n"
"\n"
"COMM may either be a tty device (for serial debugging), or \n"
"HOST:PORT to listen for a TCP connection.\n"
"\n"
"Options:\n"
" --debug Enable general debugging output.\n"
" --debug-format=opt1[,opt2,...]\n"
" Specify extra content in debugging output.\n"
" Options:\n"
" all\n"
" none\n"
#ifdef HAVE_GETTIMEOFDAY
" timestamp\n"
#endif
" --remote-debug Enable remote protocol debugging output.\n"
" --version Display version information and exit.\n"
" --wrapper WRAPPER -- Run WRAPPER to start new programs.\n"
" --once Exit after the first connection has "
"closed.\n");
if (REPORT_BUGS_TO[0] && stream == stdout)
fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
}
static void
gdbserver_show_disableable (FILE *stream)
{
fprintf (stream, "Disableable packets:\n"
" vCont \tAll vCont packets\n"
" qC \tQuerying the current thread\n"
" qfThreadInfo\tThread listing\n"
" Tthread \tPassing the thread specifier in the "
"T stop reply packet\n"
" threads \tAll of the above\n");
}
#undef require_running
#define require_running(BUF) \
if (!target_running ()) \
{ \
write_enn (BUF); \
break; \
}
static int
first_thread_of (struct inferior_list_entry *entry, void *args)
{
int pid = * (int *) args;
if (ptid_get_pid (entry->id) == pid)
return 1;
return 0;
}
static void
kill_inferior_callback (struct inferior_list_entry *entry)
{
struct process_info *process = (struct process_info *) entry;
int pid = ptid_get_pid (process->entry.id);
kill_inferior (pid);
discard_queued_stop_replies (pid);
}
/* Callback for for_each_inferior to detach or kill the inferior,
depending on whether we attached to it or not.
We inform the user whether we're detaching or killing the process
as this is only called when gdbserver is about to exit. */
static void
detach_or_kill_inferior_callback (struct inferior_list_entry *entry)
{
struct process_info *process = (struct process_info *) entry;
int pid = ptid_get_pid (process->entry.id);
if (process->attached)
detach_inferior (pid);
else
kill_inferior (pid);
discard_queued_stop_replies (pid);
}
/* for_each_inferior callback for detach_or_kill_for_exit to print
the pids of started inferiors. */
static void
print_started_pid (struct inferior_list_entry *entry)
{
struct process_info *process = (struct process_info *) entry;
if (! process->attached)
{
int pid = ptid_get_pid (process->entry.id);
fprintf (stderr, " %d", pid);
}
}
/* for_each_inferior callback for detach_or_kill_for_exit to print
the pids of attached inferiors. */
static void
print_attached_pid (struct inferior_list_entry *entry)
{
struct process_info *process = (struct process_info *) entry;
if (process->attached)
{
int pid = ptid_get_pid (process->entry.id);
fprintf (stderr, " %d", pid);
}
}
/* Call this when exiting gdbserver with possible inferiors that need
to be killed or detached from. */
static void
detach_or_kill_for_exit (void)
{
/* First print a list of the inferiors we will be killing/detaching.
This is to assist the user, for example, in case the inferior unexpectedly
dies after we exit: did we screw up or did the inferior exit on its own?
Having this info will save some head-scratching. */
if (have_started_inferiors_p ())
{
fprintf (stderr, "Killing process(es):");
for_each_inferior (&all_processes, print_started_pid);
fprintf (stderr, "\n");
}
if (have_attached_inferiors_p ())
{
fprintf (stderr, "Detaching process(es):");
for_each_inferior (&all_processes, print_attached_pid);
fprintf (stderr, "\n");
}
/* Now we can kill or detach the inferiors. */
for_each_inferior (&all_processes, detach_or_kill_inferior_callback);
}
int
main (int argc, char *argv[])
{
int bad_attach;
int pid;
char *arg_end, *port;
char **next_arg = &argv[1];
volatile int multi_mode = 0;
volatile int attach = 0;
int was_running;
while (*next_arg != NULL && **next_arg == '-')
{
if (strcmp (*next_arg, "--version") == 0)
{
gdbserver_version ();
exit (0);
}
else if (strcmp (*next_arg, "--help") == 0)
{
gdbserver_usage (stdout);
exit (0);
}
else if (strcmp (*next_arg, "--attach") == 0)
attach = 1;
else if (strcmp (*next_arg, "--multi") == 0)
multi_mode = 1;
else if (strcmp (*next_arg, "--wrapper") == 0)
{
next_arg++;
wrapper_argv = next_arg;
while (*next_arg != NULL && strcmp (*next_arg, "--") != 0)
next_arg++;
if (next_arg == wrapper_argv || *next_arg == NULL)
{
gdbserver_usage (stderr);
exit (1);
}
/* Consume the "--". */
*next_arg = NULL;
}
else if (strcmp (*next_arg, "--debug") == 0)
debug_threads = 1;
else if (strncmp (*next_arg,
"--debug-format=",
sizeof ("--debug-format=") - 1) == 0)
{
char *error_msg
= parse_debug_format_options ((*next_arg)
+ sizeof ("--debug-format=") - 1, 0);
if (error_msg != NULL)
{
fprintf (stderr, "%s", error_msg);
exit (1);
}
}
else if (strcmp (*next_arg, "--remote-debug") == 0)
remote_debug = 1;
else if (strcmp (*next_arg, "--disable-packet") == 0)
{
gdbserver_show_disableable (stdout);
exit (0);
}
else if (strncmp (*next_arg,
"--disable-packet=",
sizeof ("--disable-packet=") - 1) == 0)
{
char *packets, *tok;
packets = *next_arg += sizeof ("--disable-packet=") - 1;
for (tok = strtok (packets, ",");
tok != NULL;
tok = strtok (NULL, ","))
{
if (strcmp ("vCont", tok) == 0)
disable_packet_vCont = 1;
else if (strcmp ("Tthread", tok) == 0)
disable_packet_Tthread = 1;
else if (strcmp ("qC", tok) == 0)
disable_packet_qC = 1;
else if (strcmp ("qfThreadInfo", tok) == 0)
disable_packet_qfThreadInfo = 1;
else if (strcmp ("threads", tok) == 0)
{
disable_packet_vCont = 1;
disable_packet_Tthread = 1;
disable_packet_qC = 1;
disable_packet_qfThreadInfo = 1;
}
else
{
fprintf (stderr, "Don't know how to disable \"%s\".\n\n",
tok);
gdbserver_show_disableable (stderr);
exit (1);
}
}
}
else if (strcmp (*next_arg, "-") == 0)
{
/* "-" specifies a stdio connection and is a form of port
specification. */
*next_arg = STDIO_CONNECTION_NAME;
break;
}
else if (strcmp (*next_arg, "--disable-randomization") == 0)
disable_randomization = 1;
else if (strcmp (*next_arg, "--no-disable-randomization") == 0)
disable_randomization = 0;
else if (strcmp (*next_arg, "--once") == 0)
run_once = 1;
else
{
fprintf (stderr, "Unknown argument: %s\n", *next_arg);
exit (1);
}
next_arg++;
continue;
}
if (setjmp (toplevel))
{
fprintf (stderr, "Exiting\n");
exit (1);
}
port = *next_arg;
next_arg++;
if (port == NULL || (!attach && !multi_mode && *next_arg == NULL))
{
gdbserver_usage (stderr);
exit (1);
}
/* Remember stdio descriptors. LISTEN_DESC must not be listed, it will be
opened by remote_prepare. */
notice_open_fds ();
/* We need to know whether the remote connection is stdio before
starting the inferior. Inferiors created in this scenario have
stdin,stdout redirected. So do this here before we call
start_inferior. */
remote_prepare (port);
bad_attach = 0;
pid = 0;
/* --attach used to come after PORT, so allow it there for
compatibility. */
if (*next_arg != NULL && strcmp (*next_arg, "--attach") == 0)
{
attach = 1;
next_arg++;
}
if (attach
&& (*next_arg == NULL
|| (*next_arg)[0] == '\0'
|| (pid = strtoul (*next_arg, &arg_end, 0)) == 0
|| *arg_end != '\0'
|| next_arg[1] != NULL))
bad_attach = 1;
if (bad_attach)
{
gdbserver_usage (stderr);
exit (1);
}
initialize_async_io ();
initialize_low ();
initialize_event_loop ();
if (target_supports_tracepoints ())
initialize_tracepoint ();
own_buf = xmalloc (PBUFSIZ + 1);
mem_buf = xmalloc (PBUFSIZ);
if (pid == 0 && *next_arg != NULL)
{
int i, n;
n = argc - (next_arg - argv);
program_argv = xmalloc (sizeof (char *) * (n + 1));
for (i = 0; i < n; i++)
program_argv[i] = xstrdup (next_arg[i]);
program_argv[i] = NULL;
/* Wait till we are at first instruction in program. */
start_inferior (program_argv);
/* We are now (hopefully) stopped at the first instruction of
the target process. This assumes that the target process was
successfully created. */
}
else if (pid != 0)
{
if (attach_inferior (pid) == -1)
error ("Attaching not supported on this target");
/* Otherwise succeeded. */
}
else
{
last_status.kind = TARGET_WAITKIND_EXITED;
last_status.value.integer = 0;
last_ptid = minus_one_ptid;
}
initialize_notif ();
/* Don't report shared library events on the initial connection,
even if some libraries are preloaded. Avoids the "stopped by
shared library event" notice on gdb side. */
dlls_changed = 0;
if (setjmp (toplevel))
{
/* If something fails and longjmps while detaching or killing
inferiors, we'd end up here again, stuck in an infinite loop
trap. Be sure that if that happens, we exit immediately
instead. */
if (setjmp (toplevel) == 0)
detach_or_kill_for_exit ();
else
fprintf (stderr, "Detach or kill failed. Exiting\n");
exit (1);
}
if (last_status.kind == TARGET_WAITKIND_EXITED
|| last_status.kind == TARGET_WAITKIND_SIGNALLED)
was_running = 0;
else
was_running = 1;
if (!was_running && !multi_mode)
{
fprintf (stderr, "No program to debug. GDBserver exiting.\n");
exit (1);
}
while (1)
{
noack_mode = 0;
multi_process = 0;
/* Be sure we're out of tfind mode. */
current_traceframe = -1;
remote_open (port);
if (setjmp (toplevel) != 0)
{
/* An error occurred. */
if (response_needed)
{
write_enn (own_buf);
putpkt (own_buf);
}
}
/* Wait for events. This will return when all event sources are
removed from the event loop. */
start_event_loop ();
/* If an exit was requested (using the "monitor exit" command),
terminate now. The only other way to get here is for
getpkt to fail; close the connection and reopen it at the
top of the loop. */
if (exit_requested || run_once)
{
/* If something fails and longjmps while detaching or
killing inferiors, we'd end up here again, stuck in an
infinite loop trap. Be sure that if that happens, we
exit immediately instead. */
if (setjmp (toplevel) == 0)
{
detach_or_kill_for_exit ();
exit (0);
}
else
{
fprintf (stderr, "Detach or kill failed. Exiting\n");
exit (1);
}
}
fprintf (stderr,
"Remote side has terminated connection. "
"GDBserver will reopen the connection.\n");
/* Get rid of any pending statuses. An eventual reconnection
(by the same GDB instance or another) will refresh all its
state from scratch. */
discard_queued_stop_replies (-1);
for_each_inferior (&all_threads, clear_pending_status_callback);
if (tracing)
{
if (disconnected_tracing)
{
/* Try to enable non-stop/async mode, so we we can both
wait for an async socket accept, and handle async
target events simultaneously. There's also no point
either in having the target always stop all threads,
when we're going to pass signals down without
informing GDB. */
if (!non_stop)
{
if (start_non_stop (1))
non_stop = 1;
/* Detaching implicitly resumes all threads; simply
disconnecting does not. */
}
}
else
{
fprintf (stderr,
"Disconnected tracing disabled; stopping trace run.\n");
stop_tracing ();
}
}
}
}
/* Process options coming from Z packets for *point at address
POINT_ADDR. PACKET is the packet buffer. *PACKET is updated
to point to the first char after the last processed option. */
static void
process_point_options (CORE_ADDR point_addr, char **packet)
{
char *dataptr = *packet;
int persist;
/* Check if data has the correct format. */
if (*dataptr != ';')
return;
dataptr++;
while (*dataptr)
{
if (*dataptr == ';')
++dataptr;
if (*dataptr == 'X')
{
/* Conditional expression. */
if (debug_threads)
debug_printf ("Found breakpoint condition.\n");
add_breakpoint_condition (point_addr, &dataptr);
}
else if (strncmp (dataptr, "cmds:", strlen ("cmds:")) == 0)
{
dataptr += strlen ("cmds:");
if (debug_threads)
debug_printf ("Found breakpoint commands %s.\n", dataptr);
persist = (*dataptr == '1');
dataptr += 2;
add_breakpoint_commands (point_addr, &dataptr, persist);
}
else
{
fprintf (stderr, "Unknown token %c, ignoring.\n",
*dataptr);
/* Skip tokens until we find one that we recognize. */
while (*dataptr && *dataptr != ';')
dataptr++;
}
}
*packet = dataptr;
}
/* Event loop callback that handles a serial event. The first byte in
the serial buffer gets us here. We expect characters to arrive at
a brisk pace, so we read the rest of the packet with a blocking
getpkt call. */
static int
process_serial_event (void)
{
char ch;
int i = 0;
int signal;
unsigned int len;
int res;
CORE_ADDR mem_addr;
int pid;
unsigned char sig;
int packet_len;
int new_packet_len = -1;
/* Used to decide when gdbserver should exit in
multi-mode/remote. */
static int have_ran = 0;
if (!have_ran)
have_ran = target_running ();
disable_async_io ();
response_needed = 0;
packet_len = getpkt (own_buf);
if (packet_len <= 0)
{
remote_close ();
/* Force an event loop break. */
return -1;
}
response_needed = 1;
i = 0;
ch = own_buf[i++];
switch (ch)
{
case 'q':
handle_query (own_buf, packet_len, &new_packet_len);
break;
case 'Q':
handle_general_set (own_buf);
break;
case 'D':
require_running (own_buf);
if (multi_process)
{
i++; /* skip ';' */
pid = strtol (&own_buf[i], NULL, 16);
}
else
pid = ptid_get_pid (current_ptid);
if ((tracing && disconnected_tracing) || any_persistent_commands ())
{
struct thread_resume resume_info;
struct process_info *process = find_process_pid (pid);
if (process == NULL)
{
write_enn (own_buf);
break;
}
if (tracing && disconnected_tracing)
fprintf (stderr,
"Disconnected tracing in effect, "
"leaving gdbserver attached to the process\n");
if (any_persistent_commands ())
fprintf (stderr,
"Persistent commands are present, "
"leaving gdbserver attached to the process\n");
/* Make sure we're in non-stop/async mode, so we we can both
wait for an async socket accept, and handle async target
events simultaneously. There's also no point either in
having the target stop all threads, when we're going to
pass signals down without informing GDB. */
if (!non_stop)
{
if (debug_threads)
debug_printf ("Forcing non-stop mode\n");
non_stop = 1;
start_non_stop (1);
}
process->gdb_detached = 1;
/* Detaching implicitly resumes all threads. */
resume_info.thread = minus_one_ptid;
resume_info.kind = resume_continue;
resume_info.sig = 0;
(*the_target->resume) (&resume_info, 1);
write_ok (own_buf);
break; /* from switch/case */
}
fprintf (stderr, "Detaching from process %d\n", pid);
stop_tracing ();
if (detach_inferior (pid) != 0)
write_enn (own_buf);
else
{
discard_queued_stop_replies (pid);
write_ok (own_buf);
if (extended_protocol)
{
/* Treat this like a normal program exit. */
last_status.kind = TARGET_WAITKIND_EXITED;
last_status.value.integer = 0;
last_ptid = pid_to_ptid (pid);
current_inferior = NULL;
}
else
{
putpkt (own_buf);
remote_close ();
/* If we are attached, then we can exit. Otherwise, we
need to hang around doing nothing, until the child is
gone. */
join_inferior (pid);
exit (0);
}
}
break;
case '!':
extended_protocol = 1;
write_ok (own_buf);
break;
case '?':
handle_status (own_buf);
break;
case 'H':
if (own_buf[1] == 'c' || own_buf[1] == 'g' || own_buf[1] == 's')
{
ptid_t gdb_id, thread_id;
int pid;
require_running (own_buf);
gdb_id = read_ptid (&own_buf[2], NULL);
pid = ptid_get_pid (gdb_id);
if (ptid_equal (gdb_id, null_ptid)
|| ptid_equal (gdb_id, minus_one_ptid))
thread_id = null_ptid;
else if (pid != 0
&& ptid_equal (pid_to_ptid (pid),
gdb_id))
{
struct thread_info *thread =
(struct thread_info *) find_inferior (&all_threads,
first_thread_of,
&pid);
if (!thread)
{
write_enn (own_buf);
break;
}
thread_id = thread->entry.id;
}
else
{
thread_id = gdb_id_to_thread_id (gdb_id);
if (ptid_equal (thread_id, null_ptid))
{
write_enn (own_buf);
break;
}
}
if (own_buf[1] == 'g')
{
if (ptid_equal (thread_id, null_ptid))
{
/* GDB is telling us to choose any thread. Check if
the currently selected thread is still valid. If
it is not, select the first available. */
struct thread_info *thread =
(struct thread_info *) find_inferior_id (&all_threads,
general_thread);
if (thread == NULL)
{
thread = get_first_thread ();
thread_id = thread->entry.id;
}
}
general_thread = thread_id;
set_desired_inferior (1);
}
else if (own_buf[1] == 'c')
cont_thread = thread_id;
write_ok (own_buf);
}
else
{
/* Silently ignore it so that gdb can extend the protocol
without compatibility headaches. */
own_buf[0] = '\0';
}
break;
case 'g':
require_running (own_buf);
if (current_traceframe >= 0)
{
struct regcache *regcache
= new_register_cache (current_target_desc ());
if (fetch_traceframe_registers (current_traceframe,
regcache, -1) == 0)
registers_to_string (regcache, own_buf);
else
write_enn (own_buf);
free_register_cache (regcache);
}
else
{
struct regcache *regcache;
set_desired_inferior (1);
regcache = get_thread_regcache (current_inferior, 1);
registers_to_string (regcache, own_buf);
}
break;
case 'G':
require_running (own_buf);
if (current_traceframe >= 0)
write_enn (own_buf);
else
{
struct regcache *regcache;
set_desired_inferior (1);
regcache = get_thread_regcache (current_inferior, 1);
registers_from_string (regcache, &own_buf[1]);
write_ok (own_buf);
}
break;
case 'm':
require_running (own_buf);
decode_m_packet (&own_buf[1], &mem_addr, &len);
res = gdb_read_memory (mem_addr, mem_buf, len);
if (res < 0)
write_enn (own_buf);
else
bin2hex (mem_buf, own_buf, res);
break;
case 'M':
require_running (own_buf);
decode_M_packet (&own_buf[1], &mem_addr, &len, &mem_buf);
if (gdb_write_memory (mem_addr, mem_buf, len) == 0)
write_ok (own_buf);
else
write_enn (own_buf);
break;
case 'X':
require_running (own_buf);
if (decode_X_packet (&own_buf[1], packet_len - 1,
&mem_addr, &len, &mem_buf) < 0
|| gdb_write_memory (mem_addr, mem_buf, len) != 0)
write_enn (own_buf);
else
write_ok (own_buf);
break;
case 'C':
require_running (own_buf);
hex2bin (own_buf + 1, &sig, 1);
if (gdb_signal_to_host_p (sig))
signal = gdb_signal_to_host (sig);
else
signal = 0;
myresume (own_buf, 0, signal);
break;
case 'S':
require_running (own_buf);
hex2bin (own_buf + 1, &sig, 1);
if (gdb_signal_to_host_p (sig))
signal = gdb_signal_to_host (sig);
else
signal = 0;
myresume (own_buf, 1, signal);
break;
case 'c':
require_running (own_buf);
signal = 0;
myresume (own_buf, 0, signal);
break;
case 's':
require_running (own_buf);
signal = 0;
myresume (own_buf, 1, signal);
break;
case 'Z': /* insert_ ... */
/* Fallthrough. */
case 'z': /* remove_ ... */
{
char *dataptr;
ULONGEST addr;
int len;
char type = own_buf[1];
int res;
const int insert = ch == 'Z';
char *p = &own_buf[3];
p = unpack_varlen_hex (p, &addr);
len = strtol (p + 1, &dataptr, 16);
/* Default to unrecognized/unsupported. */
res = 1;
switch (type)
{
case '0': /* software-breakpoint */
case '1': /* hardware-breakpoint */
case '2': /* write watchpoint */
case '3': /* read watchpoint */
case '4': /* access watchpoint */
require_running (own_buf);
if (insert && the_target->insert_point != NULL)
{
/* Insert the breakpoint. If it is already inserted, nothing
will take place. */
res = (*the_target->insert_point) (type, addr, len);
/* GDB may have sent us a list of *point parameters to be
evaluated on the target's side. Read such list here. If we
already have a list of parameters, GDB is telling us to drop
that list and use this one instead. */
if (!res && (type == '0' || type == '1'))
{
/* Remove previous conditions. */
clear_gdb_breakpoint_conditions (addr);
process_point_options (addr, &dataptr);
}
}
else if (!insert && the_target->remove_point != NULL)
res = (*the_target->remove_point) (type, addr, len);
break;
default:
break;
}
if (res == 0)
write_ok (own_buf);
else if (res == 1)
/* Unsupported. */
own_buf[0] = '\0';
else
write_enn (own_buf);
break;
}
case 'k':
response_needed = 0;
if (!target_running ())
/* The packet we received doesn't make sense - but we can't
reply to it, either. */
return 0;
fprintf (stderr, "Killing all inferiors\n");
for_each_inferior (&all_processes, kill_inferior_callback);
/* When using the extended protocol, we wait with no program
running. The traditional protocol will exit instead. */
if (extended_protocol)
{
last_status.kind = TARGET_WAITKIND_EXITED;
last_status.value.sig = GDB_SIGNAL_KILL;
return 0;
}
else
exit (0);
case 'T':
{
ptid_t gdb_id, thread_id;
require_running (own_buf);
gdb_id = read_ptid (&own_buf[1], NULL);
thread_id = gdb_id_to_thread_id (gdb_id);
if (ptid_equal (thread_id, null_ptid))
{
write_enn (own_buf);
break;
}
if (mythread_alive (thread_id))
write_ok (own_buf);
else
write_enn (own_buf);
}
break;
case 'R':
response_needed = 0;
/* Restarting the inferior is only supported in the extended
protocol. */
if (extended_protocol)
{
if (target_running ())
for_each_inferior (&all_processes,
kill_inferior_callback);
fprintf (stderr, "GDBserver restarting\n");
/* Wait till we are at 1st instruction in prog. */
if (program_argv != NULL)
start_inferior (program_argv);
else
{
last_status.kind = TARGET_WAITKIND_EXITED;
last_status.value.sig = GDB_SIGNAL_KILL;
}
return 0;
}
else
{
/* It is a request we don't understand. Respond with an
empty packet so that gdb knows that we don't support this
request. */
own_buf[0] = '\0';
break;
}
case 'v':
/* Extended (long) request. */
handle_v_requests (own_buf, packet_len, &new_packet_len);
break;
default:
/* It is a request we don't understand. Respond with an empty
packet so that gdb knows that we don't support this
request. */
own_buf[0] = '\0';
break;
}
if (new_packet_len != -1)
putpkt_binary (own_buf, new_packet_len);
else
putpkt (own_buf);
response_needed = 0;
if (!extended_protocol && have_ran && !target_running ())
{
/* In non-stop, defer exiting until GDB had a chance to query
the whole vStopped list (until it gets an OK). */
if (QUEUE_is_empty (notif_event_p, notif_stop.queue))
{
/* Be transparent when GDB is connected through stdio -- no
need to spam GDB's console. */
if (!remote_connection_is_stdio ())
fprintf (stderr, "GDBserver exiting\n");
remote_close ();
exit (0);
}
}
if (exit_requested)
return -1;
return 0;
}
/* Event-loop callback for serial events. */
int
handle_serial_event (int err, gdb_client_data client_data)
{
if (debug_threads)
debug_printf ("handling possible serial event\n");
/* Really handle it. */
if (process_serial_event () < 0)
return -1;
/* Be sure to not change the selected inferior behind GDB's back.
Important in the non-stop mode asynchronous protocol. */
set_desired_inferior (1);
return 0;
}
/* Event-loop callback for target events. */
int
handle_target_event (int err, gdb_client_data client_data)
{
if (debug_threads)
debug_printf ("handling possible target event\n");
last_ptid = mywait (minus_one_ptid, &last_status,
TARGET_WNOHANG, 1);
if (last_status.kind == TARGET_WAITKIND_NO_RESUMED)
{
/* No RSP support for this yet. */
}
else if (last_status.kind != TARGET_WAITKIND_IGNORE)
{
int pid = ptid_get_pid (last_ptid);
struct process_info *process = find_process_pid (pid);
int forward_event = !gdb_connected () || process->gdb_detached;
if (last_status.kind == TARGET_WAITKIND_EXITED
|| last_status.kind == TARGET_WAITKIND_SIGNALLED)
{
mark_breakpoints_out (process);
mourn_inferior (process);
}
else
{
/* We're reporting this thread as stopped. Update its
"want-stopped" state to what the client wants, until it
gets a new resume action. */
current_inferior->last_resume_kind = resume_stop;
current_inferior->last_status = last_status;
}
if (forward_event)
{
if (!target_running ())
{
/* The last process exited. We're done. */
exit (0);
}
if (last_status.kind == TARGET_WAITKIND_STOPPED)
{
/* A thread stopped with a signal, but gdb isn't
connected to handle it. Pass it down to the
inferior, as if it wasn't being traced. */
struct thread_resume resume_info;
if (debug_threads)
debug_printf ("GDB not connected; forwarding event %d for"
" [%s]\n",
(int) last_status.kind,
target_pid_to_str (last_ptid));
resume_info.thread = last_ptid;
resume_info.kind = resume_continue;
resume_info.sig = gdb_signal_to_host (last_status.value.sig);
(*the_target->resume) (&resume_info, 1);
}
else if (debug_threads)
debug_printf ("GDB not connected; ignoring event %d for [%s]\n",
(int) last_status.kind,
target_pid_to_str (last_ptid));
}
else
{
struct vstop_notif *vstop_notif
= xmalloc (sizeof (struct vstop_notif));
vstop_notif->status = last_status;
vstop_notif->ptid = last_ptid;
/* Push Stop notification. */
notif_push (&notif_stop,
(struct notif_event *) vstop_notif);
}
}
/* Be sure to not change the selected inferior behind GDB's back.
Important in the non-stop mode asynchronous protocol. */
set_desired_inferior (1);
return 0;
}
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