diff options
Diffstat (limited to 'gdb/gdbserver/server.c')
| -rw-r--r-- | gdb/gdbserver/server.c | 4485 |
1 files changed, 0 insertions, 4485 deletions
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c deleted file mode 100644 index 3fc026f..0000000 --- a/gdb/gdbserver/server.c +++ /dev/null @@ -1,4485 +0,0 @@ -/* Main code for remote server for GDB. - Copyright (C) 1989-2020 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" - -#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; \ - } - -/* String containing the current directory (what getwd would return). */ - -char *current_directory; - -/* 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; - -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; - -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, struct 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 (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.value.related_pid.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.value.sig == GDB_SIGNAL_STOP) - cs.last_status.value.sig = 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->id, ¤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->id, ¤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; -} - -/* 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; - - if (remote_debug) - { - debug_printf (_("[QEnvironmentHexEncoded received '%s']\n"), p); - debug_printf (_("[Environment variable to be set: '%s']\n"), - final_var.c_str ()); - debug_flush (); - } - - 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); - - if (remote_debug) - { - debug_printf (_("[QEnvironmentUnset received '%s']\n"), p); - debug_printf (_("[Environment variable to be unset: '%s']\n"), - varname.c_str ()); - debug_flush (); - } - - our_environ.unset (varname.c_str ()); - - write_ok (own_buf); - return; - } - - if (strcmp (own_buf, "QStartNoAckMode") == 0) - { - if (remote_debug) - { - debug_printf ("[noack mode enabled]\n"); - debug_flush (); - } - - 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 (start_non_stop (req) != 0) - { - fprintf (stderr, "Setting %s mode failed\n", req_str); - write_enn (own_buf); - return; - } - - non_stop = (req != 0); - - if (remote_debug) - debug_printf ("[%s mode enabled]\n", 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; - - if (remote_debug) - { - debug_printf (cs.disable_randomization - ? "[address space randomization disabled]\n" - : "[address space randomization enabled]\n"); - } - - 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; - if (remote_debug) - debug_printf ("[%s agent]\n", 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. */ - sprintf (own_buf, "E.Unknown thread-events mode requested: %s\n", - mode); - return; - } - - cs.report_thread_events = (req == TRIBOOL_TRUE); - - if (remote_debug) - { - const char *req_str = cs.report_thread_events ? "enabled" : "disabled"; - - debug_printf ("[thread events are now %s]\n", req_str); - } - - 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; - } - - if (remote_debug) - 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); - - set_inferior_cwd (path.c_str ()); - - if (remote_debug) - debug_printf (_("[Set the inferior's current directory to %s]\n"), - path.c_str ()); - } - else - { - /* An empty argument means that we should clear out any - previously set cwd for the inferior. */ - set_inferior_cwd (NULL); - - if (remote_debug) - debug_printf (_("\ -[Unset the inferior's current directory; will use gdbserver's cwd]\n")); - } - 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 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; - } -} - -/* Subroutine of handle_search_memory to simplify it. */ - -static int -handle_search_memory_1 (CORE_ADDR start_addr, CORE_ADDR search_space_len, - gdb_byte *pattern, unsigned pattern_len, - gdb_byte *search_buf, - unsigned chunk_size, unsigned search_buf_size, - CORE_ADDR *found_addrp) -{ - /* Prime the search buffer. */ - - if (gdb_read_memory (start_addr, search_buf, search_buf_size) - != search_buf_size) - { - warning ("Unable to access %ld bytes of target " - "memory at 0x%lx, halting search.", - (long) search_buf_size, (long) start_addr); - return -1; - } - - /* Perform the search. - - The loop is kept simple by allocating [N + pattern-length - 1] bytes. - When we've scanned N bytes we copy the trailing bytes to the start and - read in another N bytes. */ - - while (search_space_len >= pattern_len) - { - gdb_byte *found_ptr; - unsigned nr_search_bytes = (search_space_len < search_buf_size - ? search_space_len - : search_buf_size); - - found_ptr = (gdb_byte *) memmem (search_buf, nr_search_bytes, pattern, - pattern_len); - - if (found_ptr != NULL) - { - CORE_ADDR found_addr = start_addr + (found_ptr - search_buf); - *found_addrp = found_addr; - return 1; - } - - /* Not found in this chunk, skip to next chunk. */ - - /* Don't let search_space_len wrap here, it's unsigned. */ - if (search_space_len >= chunk_size) - search_space_len -= chunk_size; - else - search_space_len = 0; - - if (search_space_len >= pattern_len) - { - unsigned keep_len = search_buf_size - chunk_size; - CORE_ADDR read_addr = start_addr + chunk_size + keep_len; - int nr_to_read; - - /* Copy the trailing part of the previous iteration to the front - of the buffer for the next iteration. */ - memcpy (search_buf, search_buf + chunk_size, keep_len); - - nr_to_read = (search_space_len - keep_len < chunk_size - ? search_space_len - keep_len - : chunk_size); - - if (gdb_read_memory (read_addr, search_buf + keep_len, - nr_to_read) != search_buf_size) - { - warning ("Unable to access %ld bytes of target memory " - "at 0x%lx, halting search.", - (long) nr_to_read, (long) read_addr); - return -1; - } - - start_addr += chunk_size; - } - } - - /* Not found. */ - - return 0; -} - -/* Handle qSearch:memory packets. */ - -static void -handle_search_memory (char *own_buf, int packet_len) -{ - CORE_ADDR start_addr; - CORE_ADDR search_space_len; - gdb_byte *pattern; - unsigned int pattern_len; - /* NOTE: also defined in find.c testcase. */ -#define SEARCH_CHUNK_SIZE 16000 - const unsigned chunk_size = SEARCH_CHUNK_SIZE; - /* Buffer to hold memory contents for searching. */ - gdb_byte *search_buf; - unsigned search_buf_size; - int found; - CORE_ADDR found_addr; - int cmd_name_len = sizeof ("qSearch:memory:") - 1; - - pattern = (gdb_byte *) malloc (packet_len); - if (pattern == NULL) - { - error ("Unable to allocate memory to perform the search"); - strcpy (own_buf, "E00"); - return; - } - if (decode_search_memory_packet (own_buf + cmd_name_len, - packet_len - cmd_name_len, - &start_addr, &search_space_len, - pattern, &pattern_len) < 0) - { - free (pattern); - error ("Error in parsing qSearch:memory packet"); - strcpy (own_buf, "E00"); - return; - } - - search_buf_size = chunk_size + pattern_len - 1; - - /* No point in trying to allocate a buffer larger than the search space. */ - if (search_space_len < search_buf_size) - search_buf_size = search_space_len; - - search_buf = (gdb_byte *) malloc (search_buf_size); - if (search_buf == NULL) - { - free (pattern); - error ("Unable to allocate memory to perform the search"); - strcpy (own_buf, "E00"); - return; - } - - found = handle_search_memory_1 (start_addr, search_space_len, - pattern, pattern_len, - search_buf, chunk_size, search_buf_size, - &found_addr); - - if (found > 0) - sprintf (own_buf, "1,%lx", (long) found_addr); - else if (found == 0) - strcpy (own_buf, "0"); - else - strcpy (own_buf, "E00"); - - free (search_buf); - free (pattern); -} - -/* 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) - { - if (debug_threads) - debug_printf ("Forcing non-stop mode\n"); - - non_stop = true; - start_non_stop (1); - } - - 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 (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.kind = TARGET_WAITKIND_EXITED; - cs.last_status.value.integer = 0; - cs.last_ptid = ptid_t (pid); - - current_thread = NULL; - } - else - { - putpkt (own_buf); - remote_close (); - - /* If we are attached, then we can exit. Otherwise, we - need to hang around doing nothing, until the child is - gone. */ - join_inferior (pid); - exit (0); - } - } -} - -/* 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 = 1; - monitor_output ("Debug output enabled.\n"); - } - else if (strcmp (mon, "set debug 0") == 0) - { - debug_threads = 0; - monitor_output ("Debug output disabled.\n"); - } - else if (strcmp (mon, "set debug-hw-points 1") == 0) - { - 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 = 1; - monitor_output ("Protocol debug output enabled.\n"); - } - else if (strcmp (mon, "set remote-debug 0") == 0) - { - remote_debug = 0; - monitor_output ("Protocol debug output disabled.\n"); - } - else if (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->read_auxv == NULL || 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) -{ - char *file; - ULONGEST pid; - int total_len; - - if (the_target->pid_to_exec_file == NULL || 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; - - 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"; - - for (const dll_info &dll : 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->qxfer_libraries_svr4 == NULL) - return -1; - - return the_target->qxfer_libraries_svr4 (annex, readbuf, writebuf, offset, len); -} - -/* Handle qXfer:osadata:read. */ - -static int -handle_qxfer_osdata (const char *annex, - gdb_byte *readbuf, const gdb_byte *writebuf, - ULONGEST offset, LONGEST len) -{ - if (the_target->qxfer_osdata == NULL || writebuf != NULL) - return -2; - - return (*the_target->qxfer_osdata) (annex, readbuf, NULL, offset, len); -} - -/* Handle qXfer:siginfo:read and qXfer:siginfo:write. */ - -static int -handle_qxfer_siginfo (const char *annex, - gdb_byte *readbuf, const gdb_byte *writebuf, - ULONGEST offset, LONGEST len) -{ - if (the_target->qxfer_siginfo == NULL) - return -2; - - if (annex[0] != '\0' || 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); - - 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. */ - -static void -handle_qxfer_threads_proper (struct buffer *buffer) -{ - buffer_grow_str (buffer, "<threads>\n"); - - for_each_thread ([&] (thread_info *thread) - { - handle_qxfer_threads_worker (thread, buffer); - }); - - buffer_grow_str0 (buffer, "</threads>\n"); -} - -/* Handle qXfer:threads:read. */ - -static int -handle_qxfer_threads (const char *annex, - gdb_byte *readbuf, const gdb_byte *writebuf, - ULONGEST offset, LONGEST len) -{ - static char *result = 0; - static unsigned int result_length = 0; - - if (writebuf != NULL) - return -2; - - if (annex[0] != '\0') - return -1; - - if (offset == 0) - { - struct buffer buffer; - /* When asked for data at offset 0, generate everything and store into - 'result'. Successive reads will be served off 'result'. */ - if (result) - free (result); - - buffer_init (&buffer); - - handle_qxfer_threads_proper (&buffer); - - result = buffer_finish (&buffer); - result_length = strlen (result); - buffer_free (&buffer); - } - - if (offset >= result_length) - { - /* We're out of data. */ - free (result); - result = NULL; - result_length = 0; - return 0; - } - - if (len > result_length - offset) - len = result_length - offset; - - memcpy (readbuf, result + offset, len); - - return len; -} - -/* Handle qXfer:traceframe-info:read. */ - -static int -handle_qxfer_traceframe_info (const char *annex, - gdb_byte *readbuf, const gdb_byte *writebuf, - ULONGEST offset, LONGEST len) -{ - 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->read_loadmap == NULL) - 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; -} - -/* 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) - { - struct thread_info *save_thread = current_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) - { - current_thread - = find_any_thread_of_pid (cs.general_thread.pid ()); - - /* Just in case, if we didn't find a thread, then bail out - instead of crashing. */ - if (current_thread == NULL) - { - write_enn (own_buf); - current_thread = save_thread; - 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 != NULL) - (*the_target->look_up_symbols) (); - - current_thread = save_thread; - - 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->read_offsets != NULL - && 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 == ':') - { - char **qsupported = NULL; - int count = 0; - int unknown = 0; - int i; - - /* 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)) - { - count++; - qsupported = XRESIZEVEC (char *, qsupported, count); - qsupported[count - 1] = xstrdup (p); - } - - for (i = 0; i < count; i++) - { - p = qsupported[i]; - if (strcmp (p, "multiprocess+") == 0) - { - /* GDB supports and wants multi-process support if - possible. */ - if (target_supports_multi_process ()) - cs.multi_process = 1; - } - else if (strcmp (p, "qRelocInsn+") == 0) - { - /* GDB supports relocate instruction requests. */ - gdb_supports_qRelocInsn = 1; - } - else if (strcmp (p, "swbreak+") == 0) - { - /* 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 (strcmp (p, "hwbreak+") == 0) - { - /* 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 (strcmp (p, "fork-events+") == 0) - { - /* GDB supports and wants fork events if possible. */ - if (target_supports_fork_events ()) - cs.report_fork_events = 1; - } - else if (strcmp (p, "vfork-events+") == 0) - { - /* GDB supports and wants vfork events if possible. */ - if (target_supports_vfork_events ()) - cs.report_vfork_events = 1; - } - else if (strcmp (p, "exec-events+") == 0) - { - /* GDB supports and wants exec events if possible. */ - if (target_supports_exec_events ()) - cs.report_exec_events = 1; - } - else if (strcmp (p, "vContSupported+") == 0) - cs.vCont_supported = 1; - else if (strcmp (p, "QThreadEvents+") == 0) - ; - else if (strcmp (p, "no-resumed+") == 0) - { - /* GDB supports and wants TARGET_WAITKIND_NO_RESUMED - events. */ - report_no_resumed = true; - } - else - { - /* Move the unknown features all together. */ - qsupported[i] = NULL; - qsupported[unknown] = p; - unknown++; - } - } - - /* Give the target backend a chance to process the unknown - features. */ - target_process_qsupported (qsupported, unknown); - - for (i = 0; i < count; i++) - free (qsupported[i]); - free (qsupported); - } - - 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->qxfer_libraries_svr4 != NULL) - strcat (own_buf, ";qXfer:libraries-svr4:read+" - ";augmented-libraries-svr4-read+"); - else - { - /* We do not have any hook to indicate whether the non-SVR4 target - backend supports qXfer:libraries:read, so always report it. */ - strcat (own_buf, ";qXfer:libraries:read+"); - } - - if (the_target->read_auxv != NULL) - strcat (own_buf, ";qXfer:auxv:read+"); - - if (the_target->qxfer_siginfo != NULL) - strcat (own_buf, ";qXfer:siginfo:read+;qXfer:siginfo:write+"); - - if (the_target->read_loadmap != NULL) - strcat (own_buf, ";qXfer:fdpic:read+"); - - /* We always report qXfer:features:read, as targets may - install XML files on a subsequent call to arch_setup. - If we reported to GDB on startup that we don't support - qXfer:feature:read at all, we will never be re-queried. */ - strcat (own_buf, ";qXfer:features:read+"); - - if (cs.transport_is_reliable) - strcat (own_buf, ";QStartNoAckMode+"); - - if (the_target->qxfer_osdata != NULL) - strcat (own_buf, ";qXfer:osdata:read+"); - - if (target_supports_multi_process ()) - strcat (own_buf, ";multiprocess+"); - - if (target_supports_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->pid_to_exec_file != NULL) - strcat (own_buf, ";qXfer:exec-file:read+"); - - strcat (own_buf, ";vContSupported+"); - - strcat (own_buf, ";QThreadEvents+"); - - strcat (own_buf, ";no-resumed+"); - - /* 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->get_tls_address != NULL - && 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->get_tib_address != NULL - && 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 == NULL - || (*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; - - /* 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. Return 1 if successful, 0 if failure. */ -static int -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. */ - dlls_changed = 0; - - if (non_stop) - { - /* In non-stop, we don't send a resume reply. Stop events - will follow up using the normal notification - mechanism. */ - write_ok (own_buf); - } - else - prepare_resume_reply (own_buf, cs.last_ptid, &cs.last_status); - - return 1; - } - else - { - write_enn (own_buf); - return 0; - } -} - -/* Run a new program. Return 1 if successful, 0 if failure. */ -static int -handle_v_run (char *own_buf) -{ - 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++; - } - new_argv.push_back (NULL); - - 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 0; - } - } - 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; - - 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; - - return 1; - } - else - { - write_enn (own_buf); - return 0; - } -} - -/* Kill process. Return 1 if successful, 0 if failure. */ -static int -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.kind = TARGET_WAITKIND_SIGNALLED; - cs.last_status.value.sig = GDB_SIGNAL_KILL; - cs.last_ptid = ptid_t (pid); - discard_queued_stop_replies (cs.last_ptid); - write_ok (own_buf); - return 1; - } - else - { - write_enn (own_buf); - return 0; - } -} - -/* Handle all of the extended 'v' packets. */ -void -handle_v_requests (char *own_buf, int packet_len, int *new_packet_len) -{ - 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->thread_stopped == NULL) - { - 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 (thread_stopped (thread)) - { - if (debug_threads) - { - std::string status_string - = target_waitstatus_to_string (&thread->last_status); - - debug_printf ("Reporting thread %s as already stopped with %s\n", - target_pid_to_str (thread->id), - status_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.kind = TARGET_WAITKIND_STOPPED; - thread->last_status.value.sig = GDB_SIGNAL_0; - } -} - -/* Set all threads' states as "want-stopped". */ - -static void -gdb_wants_all_threads_stopped (void) -{ - for_each_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.value.sig != GDB_SIGNAL_0 - /* A breakpoint, watchpoint or finished step from a previous - GDB run isn't considered interesting for a new GDB run. - If we left those pending, the new GDB could consider them - random SIGTRAPs. This leaves out real async traps. We'd - have to peek into the (target-specific) siginfo to - distinguish those. */ - && thread->last_status.value.sig != GDB_SIGNAL_TRAP)) - thread->status_pending_p = 1; -} - -/* 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; - - pause_all (0); - stabilize_threads (); - gdb_wants_all_threads_stopped (); - - /* We can only report one status, but we might be coming out of - non-stop -- if more than one thread is stopped with - interesting events, leave events for the threads we're not - reporting now pending. They'll be reported the next time the - threads are resumed. Start by marking all interesting events - as pending. */ - for_each_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) 2020 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" - " --disable-packet=OPT1[,OPT2,...]\n" - " Disable support for RSP packets or features.\n" - " Options:\n" - " vCont, 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"); -} - -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; - } -} - -/* 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 - const char *selftest_filter = NULL; -#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 = 1; - 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 = 1; - 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 ("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 - selftest_filter = *next_arg + strlen ("--selftest="); -#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 (); - initialize_event_loop (); - if (target_supports_tracepoints ()) - initialize_tracepoint (); - - mem_buf = (unsigned char *) xmalloc (PBUFSIZ); - - if (selftest) - { -#if GDB_SELF_TEST - selftests::run_tests (selftest_filter); -#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])); - program_args.push_back (NULL); - - /* Wait till we are at first instruction in program. */ - 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.kind = TARGET_WAITKIND_EXITED; - cs.last_status.value.integer = 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. */ - dlls_changed = 0; - - 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; - - 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 (start_non_stop (1)) - non_stop = 1; - - /* Detaching implicitly resumes all threads; - simply disconnecting does not. */ - } - } - else - { - fprintf (stderr, - "Disconnected tracing disabled; " - "stopping trace run.\n"); - stop_tracing (); - } - } - } - 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. */ - if (debug_threads) - debug_printf ("Found breakpoint condition.\n"); - if (!add_breakpoint_condition (bp, &dataptr)) - dataptr = strchrnul (dataptr, ';'); - } - else if (startswith (dataptr, "cmds:")) - { - dataptr += strlen ("cmds:"); - if (debug_threads) - debug_printf ("Found breakpoint commands %s.\n", 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.kind = TARGET_WAITKIND_EXITED; - cs.last_status.value.sig = 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) - { - 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.kind = TARGET_WAITKIND_EXITED; - cs.last_status.value.sig = GDB_SIGNAL_KILL; - } - return 0; - } - else - { - /* It is a request we don't understand. Respond with an - empty packet so that gdb knows that we don't support this - request. */ - 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. */ - -int -handle_serial_event (int err, gdb_client_data client_data) -{ - if (debug_threads) - debug_printf ("handling possible serial event\n"); - - /* Really handle it. */ - if (process_serial_event () < 0) - return -1; - - /* Be sure to not change the selected thread behind GDB's back. - Important in the non-stop mode asynchronous protocol. */ - set_desired_thread (); - - return 0; -} - -/* Push a stop notification on the notification queue. */ - -static void -push_stop_notification (ptid_t ptid, struct 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. */ - -int -handle_target_event (int err, gdb_client_data client_data) -{ - client_state &cs = get_client_state (); - if (debug_threads) - debug_printf ("handling possible target event\n"); - - 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; - - if (debug_threads) - debug_printf ("GDB not connected; forwarding event %d for" - " [%s]\n", - (int) cs.last_status.kind, - target_pid_to_str (cs.last_ptid)); - - if (cs.last_status.kind == TARGET_WAITKIND_STOPPED) - signal = cs.last_status.value.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 (); - - return 0; -} - -#if GDB_SELF_TEST -namespace selftests -{ - -void -reset () -{} - -} // namespace selftests -#endif /* GDB_SELF_TEST */ |