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- /* Main code for remote server for GDB.
- Copyright (C) 1989-2022 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 "gdbsupport/agent.h"
- #include "notif.h"
- #include "tdesc.h"
- #include "gdbsupport/rsp-low.h"
- #include "gdbsupport/signals-state-save-restore.h"
- #include <ctype.h>
- #include <unistd.h>
- #if HAVE_SIGNAL_H
- #include <signal.h>
- #endif
- #include "gdbsupport/gdb_vecs.h"
- #include "gdbsupport/gdb_wait.h"
- #include "gdbsupport/btrace-common.h"
- #include "gdbsupport/filestuff.h"
- #include "tracepoint.h"
- #include "dll.h"
- #include "hostio.h"
- #include <vector>
- #include "gdbsupport/common-inferior.h"
- #include "gdbsupport/job-control.h"
- #include "gdbsupport/environ.h"
- #include "filenames.h"
- #include "gdbsupport/pathstuff.h"
- #ifdef USE_XML
- #include "xml-builtin.h"
- #endif
- #include "gdbsupport/selftest.h"
- #include "gdbsupport/scope-exit.h"
- #include "gdbsupport/gdb_select.h"
- #include "gdbsupport/scoped_restore.h"
- #include "gdbsupport/search.h"
- #define require_running_or_return(BUF) \
- if (!target_running ()) \
- { \
- write_enn (BUF); \
- return; \
- }
- #define require_running_or_break(BUF) \
- if (!target_running ()) \
- { \
- write_enn (BUF); \
- break; \
- }
- /* The environment to pass to the inferior when creating it. */
- static gdb_environ our_environ;
- bool server_waiting;
- static bool extended_protocol;
- static bool response_needed;
- static bool exit_requested;
- /* --once: Exit after the first connection has closed. */
- bool run_once;
- /* Whether to report TARGET_WAITKIND_NO_RESUMED events. */
- static bool report_no_resumed;
- /* The event loop checks this to decide whether to continue accepting
- events. */
- static bool keep_processing_events = true;
- bool non_stop;
- static struct {
- /* Set the PROGRAM_PATH. Here we adjust the path of the provided
- binary if needed. */
- void set (gdb::unique_xmalloc_ptr<char> &&path)
- {
- m_path = std::move (path);
- /* Make sure we're using the absolute path of the inferior when
- creating it. */
- if (!contains_dir_separator (m_path.get ()))
- {
- int reg_file_errno;
- /* Check if the file is in our CWD. If it is, then we prefix
- its name with CURRENT_DIRECTORY. Otherwise, we leave the
- name as-is because we'll try searching for it in $PATH. */
- if (is_regular_file (m_path.get (), ®_file_errno))
- m_path = gdb_abspath (m_path.get ());
- }
- }
- /* Return the PROGRAM_PATH. */
- char *get ()
- { return m_path.get (); }
- private:
- /* The program name, adjusted if needed. */
- gdb::unique_xmalloc_ptr<char> m_path;
- } program_path;
- static std::vector<char *> program_args;
- static std::string wrapper_argv;
- /* 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;
- /* 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. */
- bool disable_packet_vCont;
- bool disable_packet_Tthread;
- bool disable_packet_qC;
- bool disable_packet_qfThreadInfo;
- bool disable_packet_T;
- 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 : public notif_event
- {
- /* Thread or process that got the event. */
- ptid_t ptid;
- /* Event info. */
- struct target_waitstatus status;
- };
- /* The current btrace configuration. This is gdbserver's mirror of GDB's
- btrace configuration. */
- static struct btrace_config current_btrace_conf;
- /* The client remote protocol state. */
- static client_state g_client_state;
- client_state &
- get_client_state ()
- {
- client_state &cs = g_client_state;
- return cs;
- }
- /* Put a stop reply to the stop reply queue. */
- static void
- queue_stop_reply (ptid_t ptid, const target_waitstatus &status)
- {
- struct vstop_notif *new_notif = new struct vstop_notif;
- new_notif->ptid = ptid;
- new_notif->status = status;
- notif_event_enque (¬if_stop, new_notif);
- }
- static bool
- remove_all_on_match_ptid (struct notif_event *event, ptid_t filter_ptid)
- {
- struct vstop_notif *vstop_event = (struct vstop_notif *) event;
- return vstop_event->ptid.matches (filter_ptid);
- }
- /* See server.h. */
- void
- discard_queued_stop_replies (ptid_t ptid)
- {
- std::list<notif_event *>::iterator iter, next, end;
- end = notif_stop.queue.end ();
- for (iter = notif_stop.queue.begin (); iter != end; iter = next)
- {
- next = iter;
- ++next;
- if (iter == notif_stop.queue.begin ())
- {
- /* The head of the list contains the notification that was
- already sent to GDB. So we can't remove it, otherwise
- when GDB sends the vStopped, it would ack the _next_
- notification, which hadn't been sent yet! */
- continue;
- }
- if (remove_all_on_match_ptid (*iter, ptid))
- {
- delete *iter;
- notif_stop.queue.erase (iter);
- }
- }
- }
- 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);
- }
- /* Helper for in_queued_stop_replies. */
- static bool
- in_queued_stop_replies_ptid (struct notif_event *event, ptid_t filter_ptid)
- {
- struct vstop_notif *vstop_event = (struct vstop_notif *) event;
- if (vstop_event->ptid.matches (filter_ptid))
- return true;
- /* Don't resume fork children that GDB does not know about yet. */
- if ((vstop_event->status.kind () == TARGET_WAITKIND_FORKED
- || vstop_event->status.kind () == TARGET_WAITKIND_VFORKED)
- && vstop_event->status.child_ptid ().matches (filter_ptid))
- return true;
- return false;
- }
- /* See server.h. */
- int
- in_queued_stop_replies (ptid_t ptid)
- {
- for (notif_event *event : notif_stop.queue)
- {
- if (in_queued_stop_replies_ptid (event, ptid))
- return true;
- }
- return false;
- }
- struct notif_server notif_stop =
- {
- "vStopped", "Stop", {}, vstop_notif_reply,
- };
- static int
- target_running (void)
- {
- return get_first_thread () != NULL;
- }
- /* See gdbsupport/common-inferior.h. */
- const char *
- get_exec_wrapper ()
- {
- return !wrapper_argv.empty () ? wrapper_argv.c_str () : NULL;
- }
- /* See gdbsupport/common-inferior.h. */
- const char *
- get_exec_file (int err)
- {
- if (err && program_path.get () == NULL)
- error (_("No executable file specified."));
- return program_path.get ();
- }
- /* See server.h. */
- gdb_environ *
- get_environ ()
- {
- return &our_environ;
- }
- static int
- attach_inferior (int pid)
- {
- client_state &cs = get_client_state ();
- /* myattach should return -1 if attaching is unsupported,
- 0 if it succeeded, and call error() otherwise. */
- if (find_process_pid (pid) != nullptr)
- error ("Already attached to process %d\n", pid);
- 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;
- if (!non_stop)
- {
- cs.last_ptid = mywait (ptid_t (pid), &cs.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 (cs.last_status.kind () == TARGET_WAITKIND_STOPPED
- && cs.last_status.sig () == GDB_SIGNAL_STOP)
- cs.last_status.set_stopped (GDB_SIGNAL_TRAP);
- current_thread->last_resume_kind = resume_stop;
- current_thread->last_status = cs.last_status;
- }
- return 0;
- }
- /* 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 gdb_byte *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, 1, (unsigned char *) buf + 1,
- &out_len, PBUFSIZ - 2) + 1;
- }
- /* Handle btrace enabling in BTS format. */
- static void
- handle_btrace_enable_bts (struct thread_info *thread)
- {
- if (thread->btrace != NULL)
- error (_("Btrace already enabled."));
- current_btrace_conf.format = BTRACE_FORMAT_BTS;
- thread->btrace = target_enable_btrace (thread, ¤t_btrace_conf);
- }
- /* Handle btrace enabling in Intel Processor Trace format. */
- static void
- handle_btrace_enable_pt (struct thread_info *thread)
- {
- if (thread->btrace != NULL)
- error (_("Btrace already enabled."));
- current_btrace_conf.format = BTRACE_FORMAT_PT;
- thread->btrace = target_enable_btrace (thread, ¤t_btrace_conf);
- }
- /* Handle btrace disabling. */
- static void
- handle_btrace_disable (struct thread_info *thread)
- {
- if (thread->btrace == NULL)
- error (_("Branch tracing not enabled."));
- if (target_disable_btrace (thread->btrace) != 0)
- error (_("Could not disable branch tracing."));
- thread->btrace = NULL;
- }
- /* Handle the "Qbtrace" packet. */
- static int
- handle_btrace_general_set (char *own_buf)
- {
- client_state &cs = get_client_state ();
- struct thread_info *thread;
- char *op;
- if (!startswith (own_buf, "Qbtrace:"))
- return 0;
- op = own_buf + strlen ("Qbtrace:");
- if (cs.general_thread == null_ptid
- || cs.general_thread == minus_one_ptid)
- {
- strcpy (own_buf, "E.Must select a single thread.");
- return -1;
- }
- thread = find_thread_ptid (cs.general_thread);
- if (thread == NULL)
- {
- strcpy (own_buf, "E.No such thread.");
- return -1;
- }
- try
- {
- if (strcmp (op, "bts") == 0)
- handle_btrace_enable_bts (thread);
- else if (strcmp (op, "pt") == 0)
- handle_btrace_enable_pt (thread);
- else if (strcmp (op, "off") == 0)
- handle_btrace_disable (thread);
- else
- error (_("Bad Qbtrace operation. Use bts, pt, or off."));
- write_ok (own_buf);
- }
- catch (const gdb_exception_error &exception)
- {
- sprintf (own_buf, "E.%s", exception.what ());
- }
- return 1;
- }
- /* Handle the "Qbtrace-conf" packet. */
- static int
- handle_btrace_conf_general_set (char *own_buf)
- {
- client_state &cs = get_client_state ();
- struct thread_info *thread;
- char *op;
- if (!startswith (own_buf, "Qbtrace-conf:"))
- return 0;
- op = own_buf + strlen ("Qbtrace-conf:");
- if (cs.general_thread == null_ptid
- || cs.general_thread == minus_one_ptid)
- {
- strcpy (own_buf, "E.Must select a single thread.");
- return -1;
- }
- thread = find_thread_ptid (cs.general_thread);
- if (thread == NULL)
- {
- strcpy (own_buf, "E.No such thread.");
- return -1;
- }
- if (startswith (op, "bts:size="))
- {
- unsigned long size;
- char *endp = NULL;
- errno = 0;
- size = strtoul (op + strlen ("bts:size="), &endp, 16);
- if (endp == NULL || *endp != 0 || errno != 0 || size > UINT_MAX)
- {
- strcpy (own_buf, "E.Bad size value.");
- return -1;
- }
- current_btrace_conf.bts.size = (unsigned int) size;
- }
- else if (strncmp (op, "pt:size=", strlen ("pt:size=")) == 0)
- {
- unsigned long size;
- char *endp = NULL;
- errno = 0;
- size = strtoul (op + strlen ("pt:size="), &endp, 16);
- if (endp == NULL || *endp != 0 || errno != 0 || size > UINT_MAX)
- {
- strcpy (own_buf, "E.Bad size value.");
- return -1;
- }
- current_btrace_conf.pt.size = (unsigned int) size;
- }
- else
- {
- strcpy (own_buf, "E.Bad Qbtrace configuration option.");
- return -1;
- }
- write_ok (own_buf);
- return 1;
- }
- /* Create the qMemTags packet reply given TAGS.
- Returns true if parsing succeeded and false otherwise. */
- static bool
- create_fetch_memtags_reply (char *reply, const gdb::byte_vector &tags)
- {
- /* It is an error to pass a zero-sized tag vector. */
- gdb_assert (tags.size () != 0);
- std::string packet ("m");
- /* Write the tag data. */
- packet += bin2hex (tags.data (), tags.size ());
- /* Check if the reply is too big for the packet to handle. */
- if (PBUFSIZ < packet.size ())
- return false;
- strcpy (reply, packet.c_str ());
- return true;
- }
- /* Parse the QMemTags request into ADDR, LEN and TAGS.
- Returns true if parsing succeeded and false otherwise. */
- static bool
- parse_store_memtags_request (char *request, CORE_ADDR *addr, size_t *len,
- gdb::byte_vector &tags, int *type)
- {
- gdb_assert (startswith (request, "QMemTags:"));
- const char *p = request + strlen ("QMemTags:");
- /* Read address and length. */
- unsigned int length = 0;
- p = decode_m_packet_params (p, addr, &length, ':');
- *len = length;
- /* Read the tag type. */
- ULONGEST tag_type = 0;
- p = unpack_varlen_hex (p, &tag_type);
- *type = (int) tag_type;
- /* Make sure there is a colon after the type. */
- if (*p != ':')
- return false;
- /* Skip the colon. */
- p++;
- /* Read the tag data. */
- tags = hex2bin (p);
- return true;
- }
- /* Handle all of the extended 'Q' packets. */
- static void
- handle_general_set (char *own_buf)
- {
- client_state &cs = get_client_state ();
- if (startswith (own_buf, "QPassSignals:"))
- {
- 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)
- {
- cs.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
- cs.pass_signals[i] = 0;
- }
- strcpy (own_buf, "OK");
- return;
- }
- if (startswith (own_buf, "QProgramSignals:"))
- {
- int numsigs = (int) GDB_SIGNAL_LAST, i;
- const char *p = own_buf + strlen ("QProgramSignals:");
- CORE_ADDR cursig;
- cs.program_signals_p = 1;
- p = decode_address_to_semicolon (&cursig, p);
- for (i = 0; i < numsigs; i++)
- {
- if (i == cursig)
- {
- cs.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
- cs.program_signals[i] = 0;
- }
- strcpy (own_buf, "OK");
- return;
- }
- if (startswith (own_buf, "QCatchSyscalls:"))
- {
- const char *p = own_buf + sizeof ("QCatchSyscalls:") - 1;
- int enabled = -1;
- CORE_ADDR sysno;
- struct process_info *process;
- if (!target_running () || !target_supports_catch_syscall ())
- {
- write_enn (own_buf);
- return;
- }
- if (strcmp (p, "0") == 0)
- enabled = 0;
- else if (p[0] == '1' && (p[1] == ';' || p[1] == '\0'))
- enabled = 1;
- else
- {
- fprintf (stderr, "Unknown catch-syscalls mode requested: %s\n",
- own_buf);
- write_enn (own_buf);
- return;
- }
- process = current_process ();
- process->syscalls_to_catch.clear ();
- if (enabled)
- {
- p += 1;
- if (*p == ';')
- {
- p += 1;
- while (*p != '\0')
- {
- p = decode_address_to_semicolon (&sysno, p);
- process->syscalls_to_catch.push_back (sysno);
- }
- }
- else
- process->syscalls_to_catch.push_back (ANY_SYSCALL);
- }
- write_ok (own_buf);
- return;
- }
- if (strcmp (own_buf, "QEnvironmentReset") == 0)
- {
- our_environ = gdb_environ::from_host_environ ();
- write_ok (own_buf);
- return;
- }
- if (startswith (own_buf, "QEnvironmentHexEncoded:"))
- {
- const char *p = own_buf + sizeof ("QEnvironmentHexEncoded:") - 1;
- /* The final form of the environment variable. FINAL_VAR will
- hold the 'VAR=VALUE' format. */
- std::string final_var = hex2str (p);
- std::string var_name, var_value;
- remote_debug_printf ("[QEnvironmentHexEncoded received '%s']", p);
- remote_debug_printf ("[Environment variable to be set: '%s']",
- final_var.c_str ());
- size_t pos = final_var.find ('=');
- if (pos == std::string::npos)
- {
- warning (_("Unexpected format for environment variable: '%s'"),
- final_var.c_str ());
- write_enn (own_buf);
- return;
- }
- var_name = final_var.substr (0, pos);
- var_value = final_var.substr (pos + 1, std::string::npos);
- our_environ.set (var_name.c_str (), var_value.c_str ());
- write_ok (own_buf);
- return;
- }
- if (startswith (own_buf, "QEnvironmentUnset:"))
- {
- const char *p = own_buf + sizeof ("QEnvironmentUnset:") - 1;
- std::string varname = hex2str (p);
- remote_debug_printf ("[QEnvironmentUnset received '%s']", p);
- remote_debug_printf ("[Environment variable to be unset: '%s']",
- varname.c_str ());
- our_environ.unset (varname.c_str ());
- write_ok (own_buf);
- return;
- }
- if (strcmp (own_buf, "QStartNoAckMode") == 0)
- {
- remote_debug_printf ("[noack mode enabled]");
- cs.noack_mode = 1;
- write_ok (own_buf);
- return;
- }
- if (startswith (own_buf, "QNonStop:"))
- {
- char *mode = own_buf + 9;
- int req = -1;
- const 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 (the_target->start_non_stop (req == 1) != 0)
- {
- fprintf (stderr, "Setting %s mode failed\n", req_str);
- write_enn (own_buf);
- return;
- }
- non_stop = (req != 0);
- remote_debug_printf ("[%s mode enabled]", req_str);
- write_ok (own_buf);
- return;
- }
- if (startswith (own_buf, "QDisableRandomization:"))
- {
- char *packet = own_buf + strlen ("QDisableRandomization:");
- ULONGEST setting;
- unpack_varlen_hex (packet, &setting);
- cs.disable_randomization = setting;
- remote_debug_printf (cs.disable_randomization
- ? "[address space randomization disabled]"
- : "[address space randomization enabled]");
- write_ok (own_buf);
- return;
- }
- if (target_supports_tracepoints ()
- && handle_tracepoint_general_set (own_buf))
- return;
- if (startswith (own_buf, "QAgent:"))
- {
- 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;
- remote_debug_printf ("[%s agent]", req ? "Enable" : "Disable");
- write_ok (own_buf);
- return;
- }
- if (handle_btrace_general_set (own_buf))
- return;
- if (handle_btrace_conf_general_set (own_buf))
- return;
- if (startswith (own_buf, "QThreadEvents:"))
- {
- char *mode = own_buf + strlen ("QThreadEvents:");
- enum tribool req = TRIBOOL_UNKNOWN;
- if (strcmp (mode, "0") == 0)
- req = TRIBOOL_FALSE;
- else if (strcmp (mode, "1") == 0)
- req = TRIBOOL_TRUE;
- else
- {
- /* We don't know what this mode is, so complain to GDB. */
- std::string err
- = string_printf ("E.Unknown thread-events mode requested: %s\n",
- mode);
- strcpy (own_buf, err.c_str ());
- return;
- }
- cs.report_thread_events = (req == TRIBOOL_TRUE);
- remote_debug_printf ("[thread events are now %s]\n",
- cs.report_thread_events ? "enabled" : "disabled");
- write_ok (own_buf);
- return;
- }
- if (startswith (own_buf, "QStartupWithShell:"))
- {
- const char *value = own_buf + strlen ("QStartupWithShell:");
- if (strcmp (value, "1") == 0)
- startup_with_shell = true;
- else if (strcmp (value, "0") == 0)
- startup_with_shell = false;
- else
- {
- /* Unknown value. */
- fprintf (stderr, "Unknown value to startup-with-shell: %s\n",
- own_buf);
- write_enn (own_buf);
- return;
- }
- remote_debug_printf ("[Inferior will %s started with shell]",
- startup_with_shell ? "be" : "not be");
- write_ok (own_buf);
- return;
- }
- if (startswith (own_buf, "QSetWorkingDir:"))
- {
- const char *p = own_buf + strlen ("QSetWorkingDir:");
- if (*p != '\0')
- {
- std::string path = hex2str (p);
- remote_debug_printf ("[Set the inferior's current directory to %s]",
- path.c_str ());
- set_inferior_cwd (std::move (path));
- }
- else
- {
- /* An empty argument means that we should clear out any
- previously set cwd for the inferior. */
- set_inferior_cwd ("");
- remote_debug_printf ("[Unset the inferior's current directory; will "
- "use gdbserver's cwd]");
- }
- write_ok (own_buf);
- return;
- }
- /* Handle store memory tags packets. */
- if (startswith (own_buf, "QMemTags:")
- && target_supports_memory_tagging ())
- {
- gdb::byte_vector tags;
- CORE_ADDR addr = 0;
- size_t len = 0;
- int type = 0;
- require_running_or_return (own_buf);
- bool ret = parse_store_memtags_request (own_buf, &addr, &len, tags,
- &type);
- if (ret)
- ret = the_target->store_memtags (addr, len, tags, type);
- if (!ret)
- write_enn (own_buf);
- else
- write_ok (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 (strcmp (annex, "target.xml") == 0)
- {
- const char *ret = tdesc_get_features_xml (desc);
- if (*ret == '@')
- return ret + 1;
- else
- annex = ret;
- }
- #ifdef USE_XML
- {
- 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;
- }
- static 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 event-loop-debug <0|1>\n");
- monitor_output (" Enable event loop 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");
- monitor_output (", timestamp");
- 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)
- {
- client_state &cs = get_client_state ();
- int res;
- if (cs.current_traceframe >= 0)
- {
- ULONGEST nbytes;
- ULONGEST length = len;
- if (traceframe_read_mem (cs.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)
- {
- if (set_desired_thread ())
- res = read_inferior_memory (memaddr, myaddr, len);
- else
- res = 1;
- 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)
- {
- client_state &cs = get_client_state ();
- if (cs.current_traceframe >= 0)
- return EIO;
- else
- {
- int ret;
- ret = prepare_to_access_memory ();
- if (ret == 0)
- {
- if (set_desired_thread ())
- ret = target_write_memory (memaddr, myaddr, len);
- else
- ret = EIO;
- done_accessing_memory ();
- }
- return ret;
- }
- }
- /* 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;
- int found;
- CORE_ADDR found_addr;
- int cmd_name_len = sizeof ("qSearch:memory:") - 1;
- pattern = (gdb_byte *) malloc (packet_len);
- if (pattern == NULL)
- error ("Unable to allocate memory to perform the search");
- 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");
- }
- auto read_memory = [] (CORE_ADDR addr, gdb_byte *result, size_t len)
- {
- return gdb_read_memory (addr, result, len) == len;
- };
- found = simple_search_memory (read_memory, start_addr, search_space_len,
- pattern, pattern_len, &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 (pattern);
- }
- /* Handle the "D" packet. */
- static void
- handle_detach (char *own_buf)
- {
- client_state &cs = get_client_state ();
- process_info *process;
- if (cs.multi_process)
- {
- /* skip 'D;' */
- int pid = strtol (&own_buf[2], NULL, 16);
- process = find_process_pid (pid);
- }
- else
- {
- process = (current_thread != nullptr
- ? get_thread_process (current_thread)
- : nullptr);
- }
- if (process == NULL)
- {
- write_enn (own_buf);
- return;
- }
- if ((tracing && disconnected_tracing) || any_persistent_commands (process))
- {
- if (tracing && disconnected_tracing)
- fprintf (stderr,
- "Disconnected tracing in effect, "
- "leaving gdbserver attached to the process\n");
- if (any_persistent_commands (process))
- 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)
- {
- threads_debug_printf ("Forcing non-stop mode");
- non_stop = true;
- the_target->start_non_stop (true);
- }
- process->gdb_detached = 1;
- /* Detaching implicitly resumes all threads. */
- target_continue_no_signal (minus_one_ptid);
- write_ok (own_buf);
- return;
- }
- fprintf (stderr, "Detaching from process %d\n", process->pid);
- stop_tracing ();
- /* We'll need this after PROCESS has been destroyed. */
- int pid = process->pid;
- /* If this process has an unreported fork child, that child is not known to
- GDB, so GDB won't take care of detaching it. We must do it here.
- Here, we specifically don't want to use "safe iteration", as detaching
- another process might delete the next thread in the iteration, which is
- the one saved by the safe iterator. We will never delete the currently
- iterated on thread, so standard iteration should be safe. */
- for (thread_info *thread : all_threads)
- {
- /* Only threads that are of the process we are detaching. */
- if (thread->id.pid () != pid)
- continue;
- /* Only threads that have a pending fork event. */
- thread_info *child = target_thread_pending_child (thread);
- if (child == nullptr)
- continue;
- process_info *fork_child_process = get_thread_process (child);
- gdb_assert (fork_child_process != nullptr);
- int fork_child_pid = fork_child_process->pid;
- if (detach_inferior (fork_child_process) != 0)
- warning (_("Failed to detach fork child %s, child of %s"),
- target_pid_to_str (ptid_t (fork_child_pid)).c_str (),
- target_pid_to_str (thread->id).c_str ());
- }
- if (detach_inferior (process) != 0)
- write_enn (own_buf);
- else
- {
- discard_queued_stop_replies (ptid_t (pid));
- write_ok (own_buf);
- if (extended_protocol || target_running ())
- {
- /* There is still at least one inferior remaining or
- we are in extended mode, so don't terminate gdbserver,
- and instead treat this like a normal program exit. */
- cs.last_status.set_exited (0);
- cs.last_ptid = ptid_t (pid);
- switch_to_thread (nullptr);
- }
- 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);
- }
- }
- }
- /* 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 an empty string 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 std::string
- parse_debug_format_options (const char *arg, int is_monitor)
- {
- /* First turn all debug format options off. */
- debug_timestamp = 0;
- /* First remove leading spaces, for "monitor set debug-format". */
- while (isspace (*arg))
- ++arg;
- std::vector<gdb::unique_xmalloc_ptr<char>> options
- = delim_string_to_char_ptr_vec (arg, ',');
- for (const gdb::unique_xmalloc_ptr<char> &option : options)
- {
- if (strcmp (option.get (), "all") == 0)
- {
- debug_timestamp = 1;
- if (is_monitor)
- monitor_output ("All extra debug format options enabled.\n");
- }
- else if (strcmp (option.get (), "none") == 0)
- {
- debug_timestamp = 0;
- if (is_monitor)
- monitor_output ("All extra debug format options disabled.\n");
- }
- else if (strcmp (option.get (), "timestamp") == 0)
- {
- debug_timestamp = 1;
- if (is_monitor)
- monitor_output ("Timestamps will be added to debug output.\n");
- }
- else if (*option == '\0')
- {
- /* An empty option, e.g., "--debug-format=foo,,bar", is ignored. */
- continue;
- }
- else
- return string_printf ("Unknown debug-format argument: \"%s\"\n",
- option.get ());
- }
- return std::string ();
- }
- /* 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 = true;
- monitor_output ("Debug output enabled.\n");
- }
- else if (strcmp (mon, "set debug 0") == 0)
- {
- debug_threads = false;
- monitor_output ("Debug output disabled.\n");
- }
- else if (strcmp (mon, "set debug-hw-points 1") == 0)
- {
- show_debug_regs = 1;
- monitor_output ("H/W point debugging output enabled.\n");
- }
- else if (strcmp (mon, "set debug-hw-points 0") == 0)
- {
- show_debug_regs = 0;
- monitor_output ("H/W point debugging output disabled.\n");
- }
- else if (strcmp (mon, "set remote-debug 1") == 0)
- {
- remote_debug = true;
- monitor_output ("Protocol debug output enabled.\n");
- }
- else if (strcmp (mon, "set remote-debug 0") == 0)
- {
- remote_debug = false;
- monitor_output ("Protocol debug output disabled.\n");
- }
- else if (strcmp (mon, "set event-loop-debug 1") == 0)
- {
- debug_event_loop = debug_event_loop_kind::ALL;
- monitor_output ("Event loop debug output enabled.\n");
- }
- else if (strcmp (mon, "set event-loop-debug 0") == 0)
- {
- debug_event_loop = debug_event_loop_kind::OFF;
- monitor_output ("Event loop debug output disabled.\n");
- }
- else if (startswith (mon, "set debug-format "))
- {
- std::string error_msg
- = parse_debug_format_options (mon + sizeof ("set debug-format ") - 1,
- 1);
- if (!error_msg.empty ())
- {
- monitor_output (error_msg.c_str ());
- monitor_show_help ();
- write_enn (own_buf);
- }
- }
- else if (strcmp (mon, "set debug-file") == 0)
- debug_set_output (nullptr);
- else if (startswith (mon, "set debug-file "))
- debug_set_output (mon + sizeof ("set debug-file ") - 1);
- else if (strcmp (mon, "help") == 0)
- monitor_show_help ();
- else if (strcmp (mon, "exit") == 0)
- exit_requested = true;
- 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->supports_read_auxv () || writebuf != NULL)
- return -2;
- if (annex[0] != '\0' || current_thread == NULL)
- return -1;
- return the_target->read_auxv (offset, readbuf, len);
- }
- /* Handle qXfer:exec-file:read. */
- static int
- handle_qxfer_exec_file (const char *annex,
- gdb_byte *readbuf, const gdb_byte *writebuf,
- ULONGEST offset, LONGEST len)
- {
- ULONGEST pid;
- int total_len;
- if (!the_target->supports_pid_to_exec_file () || writebuf != NULL)
- return -2;
- if (annex[0] == '\0')
- {
- if (current_thread == NULL)
- return -1;
- pid = pid_of (current_thread);
- }
- else
- {
- annex = unpack_varlen_hex (annex, &pid);
- if (annex[0] != '\0')
- return -1;
- }
- if (pid <= 0)
- return -1;
- const char *file = the_target->pid_to_exec_file (pid);
- if (file == NULL)
- return -1;
- total_len = strlen (file);
- if (offset > total_len)
- return -1;
- if (offset + len > total_len)
- len = total_len - offset;
- memcpy (readbuf, file + offset, len);
- return 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;
- }
- /* Handle qXfer:libraries:read. */
- static int
- handle_qxfer_libraries (const char *annex,
- gdb_byte *readbuf, const gdb_byte *writebuf,
- ULONGEST offset, LONGEST len)
- {
- if (writebuf != NULL)
- return -2;
- if (annex[0] != '\0' || current_thread == NULL)
- return -1;
- std::string document = "<library-list version=\"1.0\">\n";
- process_info *proc = current_process ();
- for (const dll_info &dll : proc->all_dlls)
- document += string_printf
- (" <library name=\"%s\"><segment address=\"0x%s\"/></library>\n",
- dll.name.c_str (), paddress (dll.base_addr));
- document += "</library-list>\n";
- if (offset > document.length ())
- return -1;
- if (offset + len > document.length ())
- len = document.length () - offset;
- memcpy (readbuf, &document[offset], len);
- 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 (current_thread == NULL
- || !the_target->supports_qxfer_libraries_svr4 ())
- 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->supports_qxfer_osdata () || 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->supports_qxfer_siginfo ())
- return -2;
- if (annex[0] != '\0' || current_thread == NULL)
- return -1;
- return the_target->qxfer_siginfo (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)
- {
- client_state &cs = get_client_state ();
- ULONGEST nbytes;
- if (writebuf != NULL)
- return -2;
- if (annex[0] != '\0' || current_thread == NULL
- || cs.current_traceframe == -1)
- return -1;
- if (traceframe_read_sdata (cs.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 (thread_info *thread, struct buffer *buffer)
- {
- ptid_t ptid = ptid_of (thread);
- char ptid_s[100];
- int core = target_core_of_thread (ptid);
- char core_s[21];
- const char *name = target_thread_name (ptid);
- int handle_len;
- gdb_byte *handle;
- bool handle_status = target_thread_handle (ptid, &handle, &handle_len);
- /* If this is a fork or vfork child (has a fork parent), GDB does not yet
- know about this process, and must not know about it until it gets the
- corresponding (v)fork event. Exclude this thread from the list. */
- if (target_thread_pending_parent (thread) != nullptr)
- return;
- write_ptid (ptid_s, ptid);
- buffer_xml_printf (buffer, "<thread id=\"%s\"", ptid_s);
- if (core != -1)
- {
- sprintf (core_s, "%d", core);
- buffer_xml_printf (buffer, " core=\"%s\"", core_s);
- }
- if (name != NULL)
- buffer_xml_printf (buffer, " name=\"%s\"", name);
- if (handle_status)
- {
- char *handle_s = (char *) alloca (handle_len * 2 + 1);
- bin2hex (handle, handle_s, handle_len);
- buffer_xml_printf (buffer, " handle=\"%s\"", handle_s);
- }
- buffer_xml_printf (buffer, "/>\n");
- }
- /* Helper for handle_qxfer_threads. Return true on success, false
- otherwise. */
- static bool
- handle_qxfer_threads_proper (struct buffer *buffer)
- {
- client_state &cs = get_client_state ();
- scoped_restore_current_thread restore_thread;
- scoped_restore save_current_general_thread
- = make_scoped_restore (&cs.general_thread);
- buffer_grow_str (buffer, "<threads>\n");
- process_info *error_proc = find_process ([&] (process_info *process)
- {
- /* The target may need to access memory and registers (e.g. via
- libthread_db) to fetch thread properties. Prepare for memory
- access here, so that we potentially pause threads just once
- for all accesses. Note that even if someday we stop needing
- to pause threads to access memory, we will need to be able to
- access registers, or other ptrace accesses like
- PTRACE_GET_THREAD_AREA. */
- /* Need to switch to each process in turn, because
- prepare_to_access_memory prepares for an access in the
- current process pointed to by general_thread. */
- switch_to_process (process);
- cs.general_thread = current_thread->id;
- int res = prepare_to_access_memory ();
- if (res == 0)
- {
- for_each_thread (process->pid, [&] (thread_info *thread)
- {
- handle_qxfer_threads_worker (thread, buffer);
- });
- done_accessing_memory ();
- return false;
- }
- else
- return true;
- });
- buffer_grow_str0 (buffer, "</threads>\n");
- return error_proc == nullptr;
- }
- /* 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 (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);
- bool res = handle_qxfer_threads_proper (&buffer);
- result = buffer_finish (&buffer);
- result_length = strlen (result);
- buffer_free (&buffer);
- if (!res)
- return -1;
- }
- 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)
- {
- client_state &cs = get_client_state ();
- static char *result = 0;
- static unsigned int result_length = 0;
- if (writebuf != NULL)
- return -2;
- if (!target_running () || annex[0] != '\0' || cs.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 (cs.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->supports_read_loadmap ())
- return -2;
- if (current_thread == NULL)
- 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)
- {
- client_state &cs = get_client_state ();
- static struct buffer cache;
- struct thread_info *thread;
- enum btrace_read_type type;
- int result;
- if (writebuf != NULL)
- return -2;
- if (cs.general_thread == null_ptid
- || cs.general_thread == minus_one_ptid)
- {
- strcpy (cs.own_buf, "E.Must select a single thread.");
- return -3;
- }
- thread = find_thread_ptid (cs.general_thread);
- if (thread == NULL)
- {
- strcpy (cs.own_buf, "E.No such thread.");
- return -3;
- }
- if (thread->btrace == NULL)
- {
- strcpy (cs.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 (cs.own_buf, "E.Bad annex.");
- return -3;
- }
- if (offset == 0)
- {
- buffer_free (&cache);
- try
- {
- result = target_read_btrace (thread->btrace, &cache, type);
- if (result != 0)
- memcpy (cs.own_buf, cache.buffer, cache.used_size);
- }
- catch (const gdb_exception_error &exception)
- {
- sprintf (cs.own_buf, "E.%s", exception.what ());
- result = -1;
- }
- if (result != 0)
- 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;
- }
- /* Handle qXfer:btrace-conf:read. */
- static int
- handle_qxfer_btrace_conf (const char *annex,
- gdb_byte *readbuf, const gdb_byte *writebuf,
- ULONGEST offset, LONGEST len)
- {
- client_state &cs = get_client_state ();
- static struct buffer cache;
- struct thread_info *thread;
- int result;
- if (writebuf != NULL)
- return -2;
- if (annex[0] != '\0')
- return -1;
- if (cs.general_thread == null_ptid
- || cs.general_thread == minus_one_ptid)
- {
- strcpy (cs.own_buf, "E.Must select a single thread.");
- return -3;
- }
- thread = find_thread_ptid (cs.general_thread);
- if (thread == NULL)
- {
- strcpy (cs.own_buf, "E.No such thread.");
- return -3;
- }
- if (thread->btrace == NULL)
- {
- strcpy (cs.own_buf, "E.Btrace not enabled.");
- return -3;
- }
- if (offset == 0)
- {
- buffer_free (&cache);
- try
- {
- result = target_read_btrace_conf (thread->btrace, &cache);
- if (result != 0)
- memcpy (cs.own_buf, cache.buffer, cache.used_size);
- }
- catch (const gdb_exception_error &exception)
- {
- sprintf (cs.own_buf, "E.%s", exception.what ());
- result = -1;
- }
- if (result != 0)
- 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 },
- { "btrace-conf", handle_qxfer_btrace_conf },
- { "exec-file", handle_qxfer_exec_file},
- { "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 },
- { "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 (!startswith (own_buf, "qXfer:"))
- 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 = (unsigned char *) 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 = (unsigned char *) 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;
- }
- /* 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)
- {
- 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 = xcrc32 (&byte, 1, crc);
- base++;
- }
- return (unsigned long long) crc;
- }
- /* Parse the qMemTags packet request into ADDR and LEN. */
- static void
- parse_fetch_memtags_request (char *request, CORE_ADDR *addr, size_t *len,
- int *type)
- {
- gdb_assert (startswith (request, "qMemTags:"));
- const char *p = request + strlen ("qMemTags:");
- /* Read address and length. */
- unsigned int length = 0;
- p = decode_m_packet_params (p, addr, &length, ':');
- *len = length;
- /* Read the tag type. */
- ULONGEST tag_type = 0;
- p = unpack_varlen_hex (p, &tag_type);
- *type = (int) tag_type;
- }
- /* Add supported btrace packets to BUF. */
- static void
- supported_btrace_packets (char *buf)
- {
- strcat (buf, ";Qbtrace:bts+");
- strcat (buf, ";Qbtrace-conf:bts:size+");
- strcat (buf, ";Qbtrace:pt+");
- strcat (buf, ";Qbtrace-conf:pt:size+");
- strcat (buf, ";Qbtrace:off+");
- strcat (buf, ";qXfer:btrace:read+");
- strcat (buf, ";qXfer:btrace-conf:read+");
- }
- /* Handle all of the extended 'q' packets. */
- static void
- handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
- {
- client_state &cs = get_client_state ();
- static std::list<thread_info *>::const_iterator thread_iter;
- /* Reply the current thread id. */
- if (strcmp ("qC", own_buf) == 0 && !disable_packet_qC)
- {
- ptid_t ptid;
- require_running_or_return (own_buf);
- if (cs.general_thread != null_ptid && cs.general_thread != minus_one_ptid)
- ptid = cs.general_thread;
- else
- {
- thread_iter = all_threads.begin ();
- ptid = (*thread_iter)->id;
- }
- sprintf (own_buf, "QC");
- own_buf += 2;
- write_ptid (own_buf, ptid);
- return;
- }
- if (strcmp ("qSymbol::", own_buf) == 0)
- {
- scoped_restore_current_thread restore_thread;
- /* For qSymbol, GDB only changes the current thread if the
- previous current thread was of a different process. So if
- the previous thread is gone, we need to pick another one of
- the same process. This can happen e.g., if we followed an
- exec in a non-leader thread. */
- if (current_thread == NULL)
- {
- thread_info *any_thread
- = find_any_thread_of_pid (cs.general_thread.pid ());
- switch_to_thread (any_thread);
- /* Just in case, if we didn't find a thread, then bail out
- instead of crashing. */
- if (current_thread == NULL)
- {
- write_enn (own_buf);
- return;
- }
- }
- /* 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 (current_thread != NULL)
- the_target->look_up_symbols ();
- strcpy (own_buf, "OK");
- return;
- }
- if (!disable_packet_qfThreadInfo)
- {
- if (strcmp ("qfThreadInfo", own_buf) == 0)
- {
- require_running_or_return (own_buf);
- thread_iter = all_threads.begin ();
- *own_buf++ = 'm';
- ptid_t ptid = (*thread_iter)->id;
- write_ptid (own_buf, ptid);
- thread_iter++;
- return;
- }
- if (strcmp ("qsThreadInfo", own_buf) == 0)
- {
- require_running_or_return (own_buf);
- if (thread_iter != all_threads.end ())
- {
- *own_buf++ = 'm';
- ptid_t ptid = (*thread_iter)->id;
- write_ptid (own_buf, ptid);
- thread_iter++;
- return;
- }
- else
- {
- sprintf (own_buf, "l");
- return;
- }
- }
- }
- if (the_target->supports_read_offsets ()
- && strcmp ("qOffsets", own_buf) == 0)
- {
- CORE_ADDR text, data;
- require_running_or_return (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 (startswith (own_buf, "qSupported")
- && (own_buf[10] == ':' || own_buf[10] == '\0'))
- {
- char *p = &own_buf[10];
- int gdb_supports_qRelocInsn = 0;
- /* Process each feature being provided by GDB. The first
- feature will follow a ':', and latter features will follow
- ';'. */
- if (*p == ':')
- {
- std::vector<std::string> qsupported;
- std::vector<const char *> unknowns;
- /* Two passes, to avoid nested strtok calls in
- target_process_qsupported. */
- char *saveptr;
- for (p = strtok_r (p + 1, ";", &saveptr);
- p != NULL;
- p = strtok_r (NULL, ";", &saveptr))
- qsupported.emplace_back (p);
- for (const std::string &feature : qsupported)
- {
- if (feature == "multiprocess+")
- {
- /* GDB supports and wants multi-process support if
- possible. */
- if (target_supports_multi_process ())
- cs.multi_process = 1;
- }
- else if (feature == "qRelocInsn+")
- {
- /* GDB supports relocate instruction requests. */
- gdb_supports_qRelocInsn = 1;
- }
- else if (feature == "swbreak+")
- {
- /* GDB wants us to report whether a trap is caused
- by a software breakpoint and for us to handle PC
- adjustment if necessary on this target. */
- if (target_supports_stopped_by_sw_breakpoint ())
- cs.swbreak_feature = 1;
- }
- else if (feature == "hwbreak+")
- {
- /* GDB wants us to report whether a trap is caused
- by a hardware breakpoint. */
- if (target_supports_stopped_by_hw_breakpoint ())
- cs.hwbreak_feature = 1;
- }
- else if (feature == "fork-events+")
- {
- /* GDB supports and wants fork events if possible. */
- if (target_supports_fork_events ())
- cs.report_fork_events = 1;
- }
- else if (feature == "vfork-events+")
- {
- /* GDB supports and wants vfork events if possible. */
- if (target_supports_vfork_events ())
- cs.report_vfork_events = 1;
- }
- else if (feature == "exec-events+")
- {
- /* GDB supports and wants exec events if possible. */
- if (target_supports_exec_events ())
- cs.report_exec_events = 1;
- }
- else if (feature == "vContSupported+")
- cs.vCont_supported = 1;
- else if (feature == "QThreadEvents+")
- ;
- else if (feature == "no-resumed+")
- {
- /* GDB supports and wants TARGET_WAITKIND_NO_RESUMED
- events. */
- report_no_resumed = true;
- }
- else if (feature == "memory-tagging+")
- {
- /* GDB supports memory tagging features. */
- if (target_supports_memory_tagging ())
- cs.memory_tagging_feature = true;
- }
- else
- {
- /* Move the unknown features all together. */
- unknowns.push_back (feature.c_str ());
- }
- }
- /* Give the target backend a chance to process the unknown
- features. */
- target_process_qsupported (unknowns);
- }
- sprintf (own_buf,
- "PacketSize=%x;QPassSignals+;QProgramSignals+;"
- "QStartupWithShell+;QEnvironmentHexEncoded+;"
- "QEnvironmentReset+;QEnvironmentUnset+;"
- "QSetWorkingDir+",
- PBUFSIZ - 1);
- if (target_supports_catch_syscall ())
- strcat (own_buf, ";QCatchSyscalls+");
- if (the_target->supports_qxfer_libraries_svr4 ())
- 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->supports_read_auxv ())
- strcat (own_buf, ";qXfer:auxv:read+");
- if (the_target->supports_qxfer_siginfo ())
- strcat (own_buf, ";qXfer:siginfo:read+;qXfer:siginfo:write+");
- if (the_target->supports_read_loadmap ())
- 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 (cs.transport_is_reliable)
- strcat (own_buf, ";QStartNoAckMode+");
- if (the_target->supports_qxfer_osdata ())
- strcat (own_buf, ";qXfer:osdata:read+");
- if (target_supports_multi_process ())
- strcat (own_buf, ";multiprocess+");
- if (target_supports_fork_events ())
- strcat (own_buf, ";fork-events+");
- if (target_supports_vfork_events ())
- strcat (own_buf, ";vfork-events+");
- if (target_supports_exec_events ())
- strcat (own_buf, ";exec-events+");
- 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+");
- }
- if (target_supports_hardware_single_step ()
- || target_supports_software_single_step () )
- {
- strcat (own_buf, ";ConditionalBreakpoints+");
- }
- strcat (own_buf, ";BreakpointCommands+");
- if (target_supports_agent ())
- strcat (own_buf, ";QAgent+");
- supported_btrace_packets (own_buf);
- if (target_supports_stopped_by_sw_breakpoint ())
- strcat (own_buf, ";swbreak+");
- if (target_supports_stopped_by_hw_breakpoint ())
- strcat (own_buf, ";hwbreak+");
- if (the_target->supports_pid_to_exec_file ())
- strcat (own_buf, ";qXfer:exec-file:read+");
- strcat (own_buf, ";vContSupported+");
- strcat (own_buf, ";QThreadEvents+");
- strcat (own_buf, ";no-resumed+");
- if (target_supports_memory_tagging ())
- strcat (own_buf, ";memory-tagging+");
- /* Reinitialize components as needed for the new connection. */
- hostio_handle_new_gdb_connection ();
- target_handle_new_gdb_connection ();
- return;
- }
- /* Thread-local storage support. */
- if (the_target->supports_get_tls_address ()
- && startswith (own_buf, "qGetTLSAddr:"))
- {
- char *p = own_buf + 12;
- CORE_ADDR parts[2], address = 0;
- int i, err;
- ptid_t ptid = null_ptid;
- require_running_or_return (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->supports_get_tib_address ()
- && startswith (own_buf, "qGetTIBAddr:"))
- {
- const 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 (startswith (own_buf, "qRcmd,"))
- {
- char *mon = (char *) 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 (mon) == 0)
- /* Default processing. */
- handle_monitor_command (mon, own_buf);
- free (mon);
- return;
- }
- if (startswith (own_buf, "qSearch:memory:"))
- {
- require_running_or_return (own_buf);
- handle_search_memory (own_buf, packet_len);
- return;
- }
- if (strcmp (own_buf, "qAttached") == 0
- || startswith (own_buf, "qAttached:"))
- {
- struct process_info *process;
- if (own_buf[sizeof ("qAttached") - 1])
- {
- int pid = strtoul (own_buf + sizeof ("qAttached:") - 1, NULL, 16);
- process = find_process_pid (pid);
- }
- else
- {
- require_running_or_return (own_buf);
- process = current_process ();
- }
- if (process == NULL)
- {
- write_enn (own_buf);
- return;
- }
- strcpy (own_buf, process->attached ? "1" : "0");
- return;
- }
- if (startswith (own_buf, "qCRC:"))
- {
- /* CRC check (compare-section). */
- const char *comma;
- ULONGEST base;
- int len;
- unsigned long long crc;
- require_running_or_return (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;
- /* Handle fetch memory tags packets. */
- if (startswith (own_buf, "qMemTags:")
- && target_supports_memory_tagging ())
- {
- gdb::byte_vector tags;
- CORE_ADDR addr = 0;
- size_t len = 0;
- int type = 0;
- require_running_or_return (own_buf);
- parse_fetch_memtags_request (own_buf, &addr, &len, &type);
- bool ret = the_target->fetch_memtags (addr, len, tags, type);
- if (ret)
- ret = create_fetch_memtags_reply (own_buf, tags);
- if (!ret)
- write_enn (own_buf);
- *new_packet_len_p = strlen (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 *);
- /* 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_thread. */
- static bool
- visit_actioned_threads (thread_info *thread,
- const struct thread_resume *actions,
- size_t num_actions,
- visit_actioned_threads_callback_ftype *callback)
- {
- for (size_t i = 0; i < num_actions; i++)
- {
- const struct thread_resume *action = &actions[i];
- if (action->thread == minus_one_ptid
- || action->thread == thread->id
- || ((action->thread.pid ()
- == thread->id.pid ())
- && action->thread.lwp () == -1))
- {
- if ((*callback) (action, thread))
- return true;
- }
- }
- return false;
- }
- /* 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)
- {
- client_state &cs = get_client_state ();
- if (thread->status_pending_p)
- {
- thread->status_pending_p = 0;
- cs.last_status = thread->last_status;
- cs.last_ptid = thread->id;
- prepare_resume_reply (cs.own_buf, cs.last_ptid, cs.last_status);
- return 1;
- }
- return 0;
- }
- /* Parse vCont packets. */
- static void
- handle_v_cont (char *own_buf)
- {
- const char *p;
- int n = 0, i = 0;
- struct thread_resume *resume_info;
- struct thread_resume default_action { null_ptid };
- /* 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 = (struct thread_resume *) 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')
- {
- char *q;
- int sig = strtol (p + 1, &q, 16);
- if (p == q)
- goto err;
- p = q;
- if (!gdb_signal_to_host_p ((enum gdb_signal) sig))
- goto err;
- resume_info[i].sig = gdb_signal_to_host ((enum gdb_signal) 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] == ':')
- {
- const char *q;
- 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;
- 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)
- {
- client_state &cs = get_client_state ();
- 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. */
- thread_info *thread_with_status = find_thread ([&] (thread_info *thread)
- {
- return visit_actioned_threads (thread, actions, num_actions,
- handle_pending_status);
- });
- if (thread_with_status != NULL)
- return;
- enable_async_io ();
- }
- the_target->resume (actions, num_actions);
- if (non_stop)
- write_ok (cs.own_buf);
- else
- {
- cs.last_ptid = mywait (minus_one_ptid, &cs.last_status, 0, 1);
- if (cs.last_status.kind () == TARGET_WAITKIND_NO_RESUMED
- && !report_no_resumed)
- {
- /* The client does not support this stop reply. At least
- return error. */
- sprintf (cs.own_buf, "E.No unwaited-for children left.");
- disable_async_io ();
- return;
- }
- if (cs.last_status.kind () != TARGET_WAITKIND_EXITED
- && cs.last_status.kind () != TARGET_WAITKIND_SIGNALLED
- && cs.last_status.kind () != TARGET_WAITKIND_NO_RESUMED)
- current_thread->last_status = cs.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 (cs.own_buf, cs.last_ptid, cs.last_status);
- disable_async_io ();
- if (cs.last_status.kind () == TARGET_WAITKIND_EXITED
- || cs.last_status.kind () == TARGET_WAITKIND_SIGNALLED)
- target_mourn_inferior (cs.last_ptid);
- }
- }
- /* Attach to a new program. */
- static void
- handle_v_attach (char *own_buf)
- {
- client_state &cs = get_client_state ();
- 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. */
- current_process ()->dlls_changed = false;
- 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, cs.last_ptid, cs.last_status);
- }
- else
- write_enn (own_buf);
- }
- /* Run a new program. */
- static void
- handle_v_run (char *own_buf)
- {
- client_state &cs = get_client_state ();
- char *p, *next_p;
- std::vector<char *> new_argv;
- char *new_program_name = NULL;
- int i, new_argc;
- new_argc = 0;
- for (p = own_buf + strlen ("vRun;"); p && *p; p = strchr (p, ';'))
- {
- p++;
- new_argc++;
- }
- for (i = 0, p = own_buf + strlen ("vRun;"); *p; p = next_p, ++i)
- {
- next_p = strchr (p, ';');
- if (next_p == NULL)
- next_p = p + strlen (p);
- if (i == 0 && p == next_p)
- {
- /* No program specified. */
- new_program_name = NULL;
- }
- else if (p == next_p)
- {
- /* Empty argument. */
- new_argv.push_back (xstrdup (""));
- }
- else
- {
- size_t len = (next_p - p) / 2;
- /* ARG is the unquoted argument received via the RSP. */
- char *arg = (char *) xmalloc (len + 1);
- /* FULL_ARGS will contain the quoted version of ARG. */
- char *full_arg = (char *) xmalloc ((len + 1) * 2);
- /* These are pointers used to navigate the strings above. */
- char *tmp_arg = arg;
- char *tmp_full_arg = full_arg;
- int need_quote = 0;
- hex2bin (p, (gdb_byte *) arg, len);
- arg[len] = '\0';
- while (*tmp_arg != '\0')
- {
- switch (*tmp_arg)
- {
- case '\n':
- /* Quote \n. */
- *tmp_full_arg = '\'';
- ++tmp_full_arg;
- need_quote = 1;
- break;
- case '\'':
- /* Quote single quote. */
- *tmp_full_arg = '\\';
- ++tmp_full_arg;
- break;
- default:
- break;
- }
- *tmp_full_arg = *tmp_arg;
- ++tmp_full_arg;
- ++tmp_arg;
- }
- if (need_quote)
- *tmp_full_arg++ = '\'';
- /* Finish FULL_ARG and push it into the vector containing
- the argv. */
- *tmp_full_arg = '\0';
- if (i == 0)
- new_program_name = full_arg;
- else
- new_argv.push_back (full_arg);
- xfree (arg);
- }
- if (*next_p)
- next_p++;
- }
- if (new_program_name == NULL)
- {
- /* GDB didn't specify a program to run. Use the program from the
- last run with the new argument list. */
- if (program_path.get () == NULL)
- {
- write_enn (own_buf);
- free_vector_argv (new_argv);
- return;
- }
- }
- else
- program_path.set (gdb::unique_xmalloc_ptr<char> (new_program_name));
- /* Free the old argv and install the new one. */
- free_vector_argv (program_args);
- program_args = new_argv;
- target_create_inferior (program_path.get (), program_args);
- if (cs.last_status.kind () == TARGET_WAITKIND_STOPPED)
- {
- prepare_resume_reply (own_buf, cs.last_ptid, cs.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)
- cs.general_thread = cs.last_ptid;
- }
- else
- write_enn (own_buf);
- }
- /* Kill process. */
- static void
- handle_v_kill (char *own_buf)
- {
- client_state &cs = get_client_state ();
- int pid;
- char *p = &own_buf[6];
- if (cs.multi_process)
- pid = strtol (p, NULL, 16);
- else
- pid = signal_pid;
- process_info *proc = find_process_pid (pid);
- if (proc != nullptr && kill_inferior (proc) == 0)
- {
- cs.last_status.set_signalled (GDB_SIGNAL_KILL);
- cs.last_ptid = ptid_t (pid);
- discard_queued_stop_replies (cs.last_ptid);
- write_ok (own_buf);
- }
- else
- write_enn (own_buf);
- }
- /* Handle all of the extended 'v' packets. */
- void
- handle_v_requests (char *own_buf, int packet_len, int *new_packet_len)
- {
- client_state &cs = get_client_state ();
- if (!disable_packet_vCont)
- {
- if (strcmp (own_buf, "vCtrlC") == 0)
- {
- the_target->request_interrupt ();
- write_ok (own_buf);
- return;
- }
- if (startswith (own_buf, "vCont;"))
- {
- handle_v_cont (own_buf);
- return;
- }
- if (startswith (own_buf, "vCont?"))
- {
- strcpy (own_buf, "vCont;c;C;t");
- if (target_supports_hardware_single_step ()
- || target_supports_software_single_step ()
- || !cs.vCont_supported)
- {
- /* If target supports single step either by hardware or by
- software, add actions s and S to the list of supported
- actions. On the other hand, if GDB doesn't request the
- supported vCont actions in qSupported packet, add s and
- S to the list too. */
- own_buf = own_buf + strlen (own_buf);
- strcpy (own_buf, ";s;S");
- }
- if (target_supports_range_stepping ())
- {
- own_buf = own_buf + strlen (own_buf);
- strcpy (own_buf, ";r");
- }
- return;
- }
- }
- if (startswith (own_buf, "vFile:")
- && handle_vFile (own_buf, packet_len, new_packet_len))
- return;
- if (startswith (own_buf, "vAttach;"))
- {
- if ((!extended_protocol || !cs.multi_process) && target_running ())
- {
- fprintf (stderr, "Already debugging a process\n");
- write_enn (own_buf);
- return;
- }
- handle_v_attach (own_buf);
- return;
- }
- if (startswith (own_buf, "vRun;"))
- {
- if ((!extended_protocol || !cs.multi_process) && target_running ())
- {
- fprintf (stderr, "Already debugging a process\n");
- write_enn (own_buf);
- return;
- }
- handle_v_run (own_buf);
- return;
- }
- if (startswith (own_buf, "vKill;"))
- {
- 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 thread 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)
- {
- client_state &cs = get_client_state ();
- struct thread_resume resume_info[2];
- int n = 0;
- int valid_cont_thread;
- valid_cont_thread = (cs.cont_thread != null_ptid
- && cs.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_thread. Make a new stop reply for each
- stopped thread. */
- static void
- queue_stop_reply_callback (thread_info *thread)
- {
- /* For now, assume targets that don't have this callback also don't
- manage the thread's last_status field. */
- if (!the_target->supports_thread_stopped ())
- {
- struct vstop_notif *new_notif = new struct vstop_notif;
- new_notif->ptid = thread->id;
- new_notif->status = thread->last_status;
- /* Pass the last stop reply back to GDB, but don't notify
- yet. */
- notif_event_enque (¬if_stop, new_notif);
- }
- else
- {
- if (target_thread_stopped (thread))
- {
- threads_debug_printf
- ("Reporting thread %s as already stopped with %s",
- target_pid_to_str (thread->id).c_str (),
- thread->last_status.to_string ().c_str ());
- 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 (thread->id, thread->last_status);
- }
- }
- }
- /* 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 (thread_info *thread)
- {
- 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.set_stopped (GDB_SIGNAL_0);
- }
- }
- /* Set all threads' states as "want-stopped". */
- static void
- gdb_wants_all_threads_stopped (void)
- {
- for_each_thread (gdb_wants_thread_stopped);
- }
- /* Callback for for_each_thread. If the thread is stopped with an
- interesting event, mark it as having a pending event. */
- static void
- set_pending_status_callback (thread_info *thread)
- {
- if (thread->last_status.kind () != TARGET_WAITKIND_STOPPED
- || (thread->last_status.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.sig () != GDB_SIGNAL_TRAP))
- thread->status_pending_p = 1;
- }
- /* Status handler for the '?' packet. */
- static void
- handle_status (char *own_buf)
- {
- client_state &cs = get_client_state ();
- /* GDB is connected, don't forward events to the target anymore. */
- for_each_process ([] (process_info *process) {
- process->gdb_detached = 0;
- });
- /* 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)
- {
- for_each_thread (queue_stop_reply_callback);
- /* 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 (¬if_stop, cs.own_buf);
- }
- else
- {
- thread_info *thread = NULL;
- target_pause_all (false);
- target_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_thread (set_pending_status_callback);
- /* Prefer the last thread that reported an event to GDB (even if
- that was a GDB_SIGNAL_TRAP). */
- if (cs.last_status.kind () != TARGET_WAITKIND_IGNORE
- && cs.last_status.kind () != TARGET_WAITKIND_EXITED
- && cs.last_status.kind () != TARGET_WAITKIND_SIGNALLED)
- thread = find_thread_ptid (cs.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_thread ([] (thread_info *thr_arg)
- {
- return thr_arg->status_pending_p;
- });
- /* If we're still out of luck, simply pick the first thread in
- the thread list. */
- if (thread == NULL)
- thread = get_first_thread ();
- 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. */
- cs.general_thread = thread->id;
- set_desired_thread ();
- gdb_assert (tp->last_status.kind () != TARGET_WAITKIND_IGNORE);
- prepare_resume_reply (own_buf, tp->id, tp->last_status);
- }
- else
- strcpy (own_buf, "W00");
- }
- }
- static void
- gdbserver_version (void)
- {
- printf ("GNU gdbserver %s%s\n"
- "Copyright (C) 2022 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),\n"
- "HOST:PORT to listen for a TCP connection, or '-' or 'stdio' to use \n"
- "stdin/stdout of gdbserver.\n"
- "PROG is the executable program. ARGS are arguments passed to inferior.\n"
- "PID is the process ID to attach to, when --attach is specified.\n"
- "\n"
- "Operating modes:\n"
- "\n"
- " --attach Attach to running process PID.\n"
- " --multi Start server without a specific program, and\n"
- " only quit when explicitly commanded.\n"
- " --once Exit after the first connection has closed.\n"
- " --help Print this message and then exit.\n"
- " --version Display version information and exit.\n"
- "\n"
- "Other options:\n"
- "\n"
- " --wrapper WRAPPER -- Run WRAPPER to start new programs.\n"
- " --disable-randomization\n"
- " Run PROG with address space randomization disabled.\n"
- " --no-disable-randomization\n"
- " Don't disable address space randomization when\n"
- " starting PROG.\n"
- " --startup-with-shell\n"
- " Start PROG using a shell. I.e., execs a shell that\n"
- " then execs PROG. (default)\n"
- " --no-startup-with-shell\n"
- " Exec PROG directly instead of using a shell.\n"
- " Disables argument globbing and variable substitution\n"
- " on UNIX-like systems.\n"
- "\n"
- "Debug options:\n"
- "\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"
- " timestamp\n"
- " --remote-debug Enable remote protocol debugging output.\n"
- " --event-loop-debug Enable event loop debugging output.\n"
- " --disable-packet=OPT1[,OPT2,...]\n"
- " Disable support for RSP packets or features.\n"
- " Options:\n"
- " vCont, T, Tthread, qC, qfThreadInfo and \n"
- " threads (disable all threading packets).\n"
- "\n"
- "For more information, consult the GDB manual (available as on-line \n"
- "info or a printed manual).\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"
- " T \tAll 'T' packets\n");
- }
- /* Start up the event loop. This is the entry point to the event
- loop. */
- static void
- start_event_loop ()
- {
- /* Loop until there is nothing to do. This is the entry point to
- the event loop engine. If nothing is ready at this time, wait
- for something to happen (via wait_for_event), then process it.
- Return when there are no longer event sources to wait for. */
- keep_processing_events = true;
- while (keep_processing_events)
- {
- /* Any events already waiting in the queue? */
- int res = gdb_do_one_event ();
- /* Was there an error? */
- if (res == -1)
- break;
- }
- /* We are done with the event loop. There are no more event sources
- to listen to. So we exit gdbserver. */
- }
- static void
- kill_inferior_callback (process_info *process)
- {
- kill_inferior (process);
- discard_queued_stop_replies (ptid_t (process->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_process ([] (process_info *process) {
- if (!process->attached)
- fprintf (stderr, " %d", process->pid);
- });
- fprintf (stderr, "\n");
- }
- if (have_attached_inferiors_p ())
- {
- fprintf (stderr, "Detaching process(es):");
- for_each_process ([] (process_info *process) {
- if (process->attached)
- fprintf (stderr, " %d", process->pid);
- });
- fprintf (stderr, "\n");
- }
- /* Now we can kill or detach the inferiors. */
- for_each_process ([] (process_info *process) {
- int pid = process->pid;
- if (process->attached)
- detach_inferior (process);
- else
- kill_inferior (process);
- discard_queued_stop_replies (ptid_t (pid));
- });
- }
- /* Value that will be passed to exit(3) when gdbserver exits. */
- static int exit_code;
- /* Wrapper for detach_or_kill_for_exit that catches and prints
- errors. */
- static void
- detach_or_kill_for_exit_cleanup ()
- {
- try
- {
- detach_or_kill_for_exit ();
- }
- catch (const gdb_exception &exception)
- {
- fflush (stdout);
- fprintf (stderr, "Detach or kill failed: %s\n",
- exception.what ());
- exit_code = 1;
- }
- }
- #if GDB_SELF_TEST
- namespace selftests {
- static void
- test_memory_tagging_functions (void)
- {
- /* Setup testing. */
- gdb::char_vector packet;
- gdb::byte_vector tags, bv;
- std::string expected;
- packet.resize (32000);
- CORE_ADDR addr;
- size_t len;
- int type;
- /* Test parsing a qMemTags request. */
- /* Valid request, addr, len and type updated. */
- addr = 0xff;
- len = 255;
- type = 255;
- strcpy (packet.data (), "qMemTags:0,0:0");
- parse_fetch_memtags_request (packet.data (), &addr, &len, &type);
- SELF_CHECK (addr == 0 && len == 0 && type == 0);
- /* Valid request, addr, len and type updated. */
- addr = 0;
- len = 0;
- type = 0;
- strcpy (packet.data (), "qMemTags:deadbeef,ff:5");
- parse_fetch_memtags_request (packet.data (), &addr, &len, &type);
- SELF_CHECK (addr == 0xdeadbeef && len == 255 && type == 5);
- /* Test creating a qMemTags reply. */
- /* Non-empty tag data. */
- bv.resize (0);
- for (int i = 0; i < 5; i++)
- bv.push_back (i);
- expected = "m0001020304";
- SELF_CHECK (create_fetch_memtags_reply (packet.data (), bv) == true);
- SELF_CHECK (strcmp (packet.data (), expected.c_str ()) == 0);
- /* Test parsing a QMemTags request. */
- /* Valid request and empty tag data: addr, len, type and tags updated. */
- addr = 0xff;
- len = 255;
- type = 255;
- tags.resize (5);
- strcpy (packet.data (), "QMemTags:0,0:0:");
- SELF_CHECK (parse_store_memtags_request (packet.data (),
- &addr, &len, tags, &type) == true);
- SELF_CHECK (addr == 0 && len == 0 && type == 0 && tags.size () == 0);
- /* Valid request and non-empty tag data: addr, len, type
- and tags updated. */
- addr = 0;
- len = 0;
- type = 0;
- tags.resize (0);
- strcpy (packet.data (),
- "QMemTags:deadbeef,ff:5:0001020304");
- SELF_CHECK (parse_store_memtags_request (packet.data (), &addr, &len, tags,
- &type) == true);
- SELF_CHECK (addr == 0xdeadbeef && len == 255 && type == 5
- && tags.size () == 5);
- }
- } // namespace selftests
- #endif /* GDB_SELF_TEST */
- /* Main function. This is called by the real "main" function,
- wrapped in a TRY_CATCH that handles any uncaught exceptions. */
- static void ATTRIBUTE_NORETURN
- captured_main (int argc, char *argv[])
- {
- int bad_attach;
- int pid;
- char *arg_end;
- const char *port = NULL;
- char **next_arg = &argv[1];
- volatile int multi_mode = 0;
- volatile int attach = 0;
- int was_running;
- bool selftest = false;
- #if GDB_SELF_TEST
- std::vector<const char *> selftest_filters;
- selftests::register_test ("remote_memory_tagging",
- selftests::test_memory_tagging_functions);
- #endif
- current_directory = getcwd (NULL, 0);
- client_state &cs = get_client_state ();
- if (current_directory == NULL)
- {
- error (_("Could not find current working directory: %s"),
- safe_strerror (errno));
- }
- 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)
- {
- char **tmp;
- next_arg++;
- tmp = next_arg;
- while (*next_arg != NULL && strcmp (*next_arg, "--") != 0)
- {
- wrapper_argv += *next_arg;
- wrapper_argv += ' ';
- next_arg++;
- }
- if (!wrapper_argv.empty ())
- {
- /* Erase the last whitespace. */
- wrapper_argv.erase (wrapper_argv.end () - 1);
- }
- if (next_arg == tmp || *next_arg == NULL)
- {
- gdbserver_usage (stderr);
- exit (1);
- }
- /* Consume the "--". */
- *next_arg = NULL;
- }
- else if (strcmp (*next_arg, "--debug") == 0)
- debug_threads = true;
- else if (startswith (*next_arg, "--debug-format="))
- {
- std::string error_msg
- = parse_debug_format_options ((*next_arg)
- + sizeof ("--debug-format=") - 1, 0);
- if (!error_msg.empty ())
- {
- fprintf (stderr, "%s", error_msg.c_str ());
- exit (1);
- }
- }
- else if (strcmp (*next_arg, "--remote-debug") == 0)
- remote_debug = true;
- else if (strcmp (*next_arg, "--event-loop-debug") == 0)
- debug_event_loop = debug_event_loop_kind::ALL;
- else if (startswith (*next_arg, "--debug-file="))
- debug_set_output ((*next_arg) + sizeof ("--debug-file=") -1);
- else if (strcmp (*next_arg, "--disable-packet") == 0)
- {
- gdbserver_show_disableable (stdout);
- exit (0);
- }
- else if (startswith (*next_arg, "--disable-packet="))
- {
- char *packets = *next_arg += sizeof ("--disable-packet=") - 1;
- char *saveptr;
- for (char *tok = strtok_r (packets, ",", &saveptr);
- tok != NULL;
- tok = strtok_r (NULL, ",", &saveptr))
- {
- if (strcmp ("vCont", tok) == 0)
- disable_packet_vCont = true;
- else if (strcmp ("Tthread", tok) == 0)
- disable_packet_Tthread = true;
- else if (strcmp ("qC", tok) == 0)
- disable_packet_qC = true;
- else if (strcmp ("qfThreadInfo", tok) == 0)
- disable_packet_qfThreadInfo = true;
- else if (strcmp ("T", tok) == 0)
- disable_packet_T = true;
- else if (strcmp ("threads", tok) == 0)
- {
- disable_packet_vCont = true;
- disable_packet_Tthread = true;
- disable_packet_qC = true;
- disable_packet_qfThreadInfo = true;
- }
- 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. */
- port = STDIO_CONNECTION_NAME;
- next_arg++;
- break;
- }
- else if (strcmp (*next_arg, "--disable-randomization") == 0)
- cs.disable_randomization = 1;
- else if (strcmp (*next_arg, "--no-disable-randomization") == 0)
- cs.disable_randomization = 0;
- else if (strcmp (*next_arg, "--startup-with-shell") == 0)
- startup_with_shell = true;
- else if (strcmp (*next_arg, "--no-startup-with-shell") == 0)
- startup_with_shell = false;
- else if (strcmp (*next_arg, "--once") == 0)
- run_once = true;
- else if (strcmp (*next_arg, "--selftest") == 0)
- selftest = true;
- else if (startswith (*next_arg, "--selftest="))
- {
- selftest = true;
- #if GDB_SELF_TEST
- const char *filter = *next_arg + strlen ("--selftest=");
- if (*filter == '\0')
- {
- fprintf (stderr, _("Error: selftest filter is empty.\n"));
- exit (1);
- }
- selftest_filters.push_back (filter);
- #endif
- }
- else
- {
- fprintf (stderr, "Unknown argument: %s\n", *next_arg);
- exit (1);
- }
- next_arg++;
- continue;
- }
- if (port == NULL)
- {
- port = *next_arg;
- next_arg++;
- }
- if ((port == NULL || (!attach && !multi_mode && *next_arg == NULL))
- && !selftest)
- {
- gdbserver_usage (stderr);
- exit (1);
- }
- /* Remember stdio descriptors. LISTEN_DESC must not be listed, it will be
- opened by remote_prepare. */
- notice_open_fds ();
- save_original_signals_state (false);
- /* 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. */
- if (port != NULL)
- 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);
- }
- /* Gather information about the environment. */
- our_environ = gdb_environ::from_host_environ ();
- initialize_async_io ();
- initialize_low ();
- have_job_control ();
- if (target_supports_tracepoints ())
- initialize_tracepoint ();
- mem_buf = (unsigned char *) xmalloc (PBUFSIZ);
- if (selftest)
- {
- #if GDB_SELF_TEST
- selftests::run_tests (selftest_filters);
- #else
- printf (_("Selftests have been disabled for this build.\n"));
- #endif
- throw_quit ("Quit");
- }
- if (pid == 0 && *next_arg != NULL)
- {
- int i, n;
- n = argc - (next_arg - argv);
- program_path.set (make_unique_xstrdup (next_arg[0]));
- for (i = 1; i < n; i++)
- program_args.push_back (xstrdup (next_arg[i]));
- /* Wait till we are at first instruction in program. */
- target_create_inferior (program_path.get (), program_args);
- /* 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
- {
- cs.last_status.set_exited (0);
- cs.last_ptid = minus_one_ptid;
- }
- SCOPE_EXIT { detach_or_kill_for_exit_cleanup (); };
- /* 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. */
- if (current_thread != nullptr)
- current_process ()->dlls_changed = false;
- if (cs.last_status.kind () == TARGET_WAITKIND_EXITED
- || cs.last_status.kind () == TARGET_WAITKIND_SIGNALLED)
- was_running = 0;
- else
- was_running = 1;
- if (!was_running && !multi_mode)
- error ("No program to debug");
- while (1)
- {
- cs.noack_mode = 0;
- cs.multi_process = 0;
- cs.report_fork_events = 0;
- cs.report_vfork_events = 0;
- cs.report_exec_events = 0;
- /* Be sure we're out of tfind mode. */
- cs.current_traceframe = -1;
- cs.cont_thread = null_ptid;
- cs.swbreak_feature = 0;
- cs.hwbreak_feature = 0;
- cs.vCont_supported = 0;
- cs.memory_tagging_feature = false;
- remote_open (port);
- try
- {
- /* 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. */
- if (exit_requested)
- throw_quit ("Quit");
- /* The only other way to get here is for getpkt to fail:
- - If --once was specified, we're done.
- - If not in extended-remote mode, and we're no longer
- debugging anything, simply exit: GDB has disconnected
- after processing the last process exit.
- - Otherwise, close the connection and reopen it at the
- top of the loop. */
- if (run_once || (!extended_protocol && !target_running ()))
- throw_quit ("Quit");
- 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 (minus_one_ptid);
- for_each_thread ([] (thread_info *thread)
- {
- thread->status_pending_p = 0;
- });
- 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 (the_target->start_non_stop (true))
- non_stop = 1;
- /* Detaching implicitly resumes all threads;
- simply disconnecting does not. */
- }
- }
- else
- {
- fprintf (stderr,
- "Disconnected tracing disabled; "
- "stopping trace run.\n");
- stop_tracing ();
- }
- }
- }
- catch (const gdb_exception_error &exception)
- {
- fflush (stdout);
- fprintf (stderr, "gdbserver: %s\n", exception.what ());
- if (response_needed)
- {
- write_enn (cs.own_buf);
- putpkt (cs.own_buf);
- }
- if (run_once)
- throw_quit ("Quit");
- }
- }
- }
- /* Main function. */
- int
- main (int argc, char *argv[])
- {
- try
- {
- captured_main (argc, argv);
- }
- catch (const gdb_exception &exception)
- {
- if (exception.reason == RETURN_ERROR)
- {
- fflush (stdout);
- fprintf (stderr, "%s\n", exception.what ());
- fprintf (stderr, "Exiting\n");
- exit_code = 1;
- }
- exit (exit_code);
- }
- gdb_assert_not_reached ("captured_main should never return");
- }
- /* Process options coming from Z packets for a breakpoint. PACKET is
- the packet buffer. *PACKET is updated to point to the first char
- after the last processed option. */
- static void
- process_point_options (struct gdb_breakpoint *bp, const char **packet)
- {
- const 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. */
- threads_debug_printf ("Found breakpoint condition.");
- if (!add_breakpoint_condition (bp, &dataptr))
- dataptr = strchrnul (dataptr, ';');
- }
- else if (startswith (dataptr, "cmds:"))
- {
- dataptr += strlen ("cmds:");
- threads_debug_printf ("Found breakpoint commands %s.", dataptr);
- persist = (*dataptr == '1');
- dataptr += 2;
- if (add_breakpoint_commands (bp, &dataptr, persist))
- dataptr = strchrnul (dataptr, ';');
- }
- else
- {
- fprintf (stderr, "Unknown token %c, ignoring.\n",
- *dataptr);
- /* Skip tokens until we find one that we recognize. */
- dataptr = strchrnul (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)
- {
- client_state &cs = get_client_state ();
- int signal;
- unsigned int len;
- CORE_ADDR mem_addr;
- unsigned char sig;
- int packet_len;
- int new_packet_len = -1;
- disable_async_io ();
- response_needed = false;
- packet_len = getpkt (cs.own_buf);
- if (packet_len <= 0)
- {
- remote_close ();
- /* Force an event loop break. */
- return -1;
- }
- response_needed = true;
- char ch = cs.own_buf[0];
- switch (ch)
- {
- case 'q':
- handle_query (cs.own_buf, packet_len, &new_packet_len);
- break;
- case 'Q':
- handle_general_set (cs.own_buf);
- break;
- case 'D':
- handle_detach (cs.own_buf);
- break;
- case '!':
- extended_protocol = true;
- write_ok (cs.own_buf);
- break;
- case '?':
- handle_status (cs.own_buf);
- break;
- case 'H':
- if (cs.own_buf[1] == 'c' || cs.own_buf[1] == 'g' || cs.own_buf[1] == 's')
- {
- require_running_or_break (cs.own_buf);
- ptid_t thread_id = read_ptid (&cs.own_buf[2], NULL);
- if (thread_id == null_ptid || thread_id == minus_one_ptid)
- thread_id = null_ptid;
- else if (thread_id.is_pid ())
- {
- /* The ptid represents a pid. */
- thread_info *thread = find_any_thread_of_pid (thread_id.pid ());
- if (thread == NULL)
- {
- write_enn (cs.own_buf);
- break;
- }
- thread_id = thread->id;
- }
- else
- {
- /* The ptid represents a lwp/tid. */
- if (find_thread_ptid (thread_id) == NULL)
- {
- write_enn (cs.own_buf);
- break;
- }
- }
- if (cs.own_buf[1] == 'g')
- {
- if (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. */
- thread_info *thread = find_thread_ptid (cs.general_thread);
- if (thread == NULL)
- thread = get_first_thread ();
- thread_id = thread->id;
- }
- cs.general_thread = thread_id;
- set_desired_thread ();
- gdb_assert (current_thread != NULL);
- }
- else if (cs.own_buf[1] == 'c')
- cs.cont_thread = thread_id;
- write_ok (cs.own_buf);
- }
- else
- {
- /* Silently ignore it so that gdb can extend the protocol
- without compatibility headaches. */
- cs.own_buf[0] = '\0';
- }
- break;
- case 'g':
- require_running_or_break (cs.own_buf);
- if (cs.current_traceframe >= 0)
- {
- struct regcache *regcache
- = new_register_cache (current_target_desc ());
- if (fetch_traceframe_registers (cs.current_traceframe,
- regcache, -1) == 0)
- registers_to_string (regcache, cs.own_buf);
- else
- write_enn (cs.own_buf);
- free_register_cache (regcache);
- }
- else
- {
- struct regcache *regcache;
- if (!set_desired_thread ())
- write_enn (cs.own_buf);
- else
- {
- regcache = get_thread_regcache (current_thread, 1);
- registers_to_string (regcache, cs.own_buf);
- }
- }
- break;
- case 'G':
- require_running_or_break (cs.own_buf);
- if (cs.current_traceframe >= 0)
- write_enn (cs.own_buf);
- else
- {
- struct regcache *regcache;
- if (!set_desired_thread ())
- write_enn (cs.own_buf);
- else
- {
- regcache = get_thread_regcache (current_thread, 1);
- registers_from_string (regcache, &cs.own_buf[1]);
- write_ok (cs.own_buf);
- }
- }
- break;
- case 'm':
- {
- require_running_or_break (cs.own_buf);
- decode_m_packet (&cs.own_buf[1], &mem_addr, &len);
- int res = gdb_read_memory (mem_addr, mem_buf, len);
- if (res < 0)
- write_enn (cs.own_buf);
- else
- bin2hex (mem_buf, cs.own_buf, res);
- }
- break;
- case 'M':
- require_running_or_break (cs.own_buf);
- decode_M_packet (&cs.own_buf[1], &mem_addr, &len, &mem_buf);
- if (gdb_write_memory (mem_addr, mem_buf, len) == 0)
- write_ok (cs.own_buf);
- else
- write_enn (cs.own_buf);
- break;
- case 'X':
- require_running_or_break (cs.own_buf);
- if (decode_X_packet (&cs.own_buf[1], packet_len - 1,
- &mem_addr, &len, &mem_buf) < 0
- || gdb_write_memory (mem_addr, mem_buf, len) != 0)
- write_enn (cs.own_buf);
- else
- write_ok (cs.own_buf);
- break;
- case 'C':
- require_running_or_break (cs.own_buf);
- hex2bin (cs.own_buf + 1, &sig, 1);
- if (gdb_signal_to_host_p ((enum gdb_signal) sig))
- signal = gdb_signal_to_host ((enum gdb_signal) sig);
- else
- signal = 0;
- myresume (cs.own_buf, 0, signal);
- break;
- case 'S':
- require_running_or_break (cs.own_buf);
- hex2bin (cs.own_buf + 1, &sig, 1);
- if (gdb_signal_to_host_p ((enum gdb_signal) sig))
- signal = gdb_signal_to_host ((enum gdb_signal) sig);
- else
- signal = 0;
- myresume (cs.own_buf, 1, signal);
- break;
- case 'c':
- require_running_or_break (cs.own_buf);
- signal = 0;
- myresume (cs.own_buf, 0, signal);
- break;
- case 's':
- require_running_or_break (cs.own_buf);
- signal = 0;
- myresume (cs.own_buf, 1, signal);
- break;
- case 'Z': /* insert_ ... */
- /* Fallthrough. */
- case 'z': /* remove_ ... */
- {
- char *dataptr;
- ULONGEST addr;
- int kind;
- char type = cs.own_buf[1];
- int res;
- const int insert = ch == 'Z';
- const char *p = &cs.own_buf[3];
- p = unpack_varlen_hex (p, &addr);
- kind = strtol (p + 1, &dataptr, 16);
- if (insert)
- {
- struct gdb_breakpoint *bp;
- bp = set_gdb_breakpoint (type, addr, kind, &res);
- if (bp != NULL)
- {
- res = 0;
- /* 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. */
- clear_breakpoint_conditions_and_commands (bp);
- const char *options = dataptr;
- process_point_options (bp, &options);
- }
- }
- else
- res = delete_gdb_breakpoint (type, addr, kind);
- if (res == 0)
- write_ok (cs.own_buf);
- else if (res == 1)
- /* Unsupported. */
- cs.own_buf[0] = '\0';
- else
- write_enn (cs.own_buf);
- break;
- }
- case 'k':
- response_needed = false;
- 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_process (kill_inferior_callback);
- /* When using the extended protocol, we wait with no program
- running. The traditional protocol will exit instead. */
- if (extended_protocol)
- {
- cs.last_status.set_exited (GDB_SIGNAL_KILL);
- return 0;
- }
- else
- exit (0);
- case 'T':
- {
- require_running_or_break (cs.own_buf);
- ptid_t thread_id = read_ptid (&cs.own_buf[1], NULL);
- if (find_thread_ptid (thread_id) == NULL)
- {
- write_enn (cs.own_buf);
- break;
- }
- if (mythread_alive (thread_id))
- write_ok (cs.own_buf);
- else
- write_enn (cs.own_buf);
- }
- break;
- case 'R':
- response_needed = false;
- /* Restarting the inferior is only supported in the extended
- protocol. */
- if (extended_protocol)
- {
- if (target_running ())
- for_each_process (kill_inferior_callback);
- fprintf (stderr, "GDBserver restarting\n");
- /* Wait till we are at 1st instruction in prog. */
- if (program_path.get () != NULL)
- {
- target_create_inferior (program_path.get (), program_args);
- if (cs.last_status.kind () == TARGET_WAITKIND_STOPPED)
- {
- /* Stopped at the first instruction of the target
- process. */
- cs.general_thread = cs.last_ptid;
- }
- else
- {
- /* Something went wrong. */
- cs.general_thread = null_ptid;
- }
- }
- else
- {
- cs.last_status.set_exited (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. */
- cs.own_buf[0] = '\0';
- break;
- }
- case 'v':
- /* Extended (long) request. */
- handle_v_requests (cs.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. */
- cs.own_buf[0] = '\0';
- break;
- }
- if (new_packet_len != -1)
- putpkt_binary (cs.own_buf, new_packet_len);
- else
- putpkt (cs.own_buf);
- response_needed = false;
- if (exit_requested)
- return -1;
- return 0;
- }
- /* Event-loop callback for serial events. */
- void
- handle_serial_event (int err, gdb_client_data client_data)
- {
- threads_debug_printf ("handling possible serial event");
- /* Really handle it. */
- if (process_serial_event () < 0)
- {
- keep_processing_events = false;
- return;
- }
- /* Be sure to not change the selected thread behind GDB's back.
- Important in the non-stop mode asynchronous protocol. */
- set_desired_thread ();
- }
- /* Push a stop notification on the notification queue. */
- static void
- push_stop_notification (ptid_t ptid, const target_waitstatus &status)
- {
- struct vstop_notif *vstop_notif = new struct vstop_notif;
- vstop_notif->status = status;
- vstop_notif->ptid = ptid;
- /* Push Stop notification. */
- notif_push (¬if_stop, vstop_notif);
- }
- /* Event-loop callback for target events. */
- void
- handle_target_event (int err, gdb_client_data client_data)
- {
- client_state &cs = get_client_state ();
- threads_debug_printf ("handling possible target event");
- cs.last_ptid = mywait (minus_one_ptid, &cs.last_status,
- TARGET_WNOHANG, 1);
- if (cs.last_status.kind () == TARGET_WAITKIND_NO_RESUMED)
- {
- if (gdb_connected () && report_no_resumed)
- push_stop_notification (null_ptid, cs.last_status);
- }
- else if (cs.last_status.kind () != TARGET_WAITKIND_IGNORE)
- {
- int pid = cs.last_ptid.pid ();
- struct process_info *process = find_process_pid (pid);
- int forward_event = !gdb_connected () || process->gdb_detached;
- if (cs.last_status.kind () == TARGET_WAITKIND_EXITED
- || cs.last_status.kind () == TARGET_WAITKIND_SIGNALLED)
- {
- mark_breakpoints_out (process);
- target_mourn_inferior (cs.last_ptid);
- }
- else if (cs.last_status.kind () == TARGET_WAITKIND_THREAD_EXITED)
- ;
- 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_thread->last_resume_kind = resume_stop;
- current_thread->last_status = cs.last_status;
- }
- if (forward_event)
- {
- if (!target_running ())
- {
- /* The last process exited. We're done. */
- exit (0);
- }
- if (cs.last_status.kind () == TARGET_WAITKIND_EXITED
- || cs.last_status.kind () == TARGET_WAITKIND_SIGNALLED
- || cs.last_status.kind () == TARGET_WAITKIND_THREAD_EXITED)
- ;
- else
- {
- /* 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. */
- enum gdb_signal signal;
- threads_debug_printf ("GDB not connected; forwarding event %d for"
- " [%s]",
- (int) cs.last_status.kind (),
- target_pid_to_str (cs.last_ptid).c_str ());
- if (cs.last_status.kind () == TARGET_WAITKIND_STOPPED)
- signal = cs.last_status.sig ();
- else
- signal = GDB_SIGNAL_0;
- target_continue (cs.last_ptid, signal);
- }
- }
- else
- push_stop_notification (cs.last_ptid, cs.last_status);
- }
- /* Be sure to not change the selected thread behind GDB's back.
- Important in the non-stop mode asynchronous protocol. */
- set_desired_thread ();
- }
- /* See gdbsupport/event-loop.h. */
- int
- invoke_async_signal_handlers ()
- {
- return 0;
- }
- /* See gdbsupport/event-loop.h. */
- int
- check_async_event_handlers ()
- {
- return 0;
- }
- /* See gdbsupport/errors.h */
- void
- flush_streams ()
- {
- fflush (stdout);
- fflush (stderr);
- }
- /* See gdbsupport/gdb_select.h. */
- int
- gdb_select (int n, fd_set *readfds, fd_set *writefds,
- fd_set *exceptfds, struct timeval *timeout)
- {
- return select (n, readfds, writefds, exceptfds, timeout);
- }
- #if GDB_SELF_TEST
- namespace selftests
- {
- void
- reset ()
- {}
- } // namespace selftests
- #endif /* GDB_SELF_TEST */
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