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Diffstat (limited to 'gdbserver/server.cc')
| -rw-r--r-- | gdbserver/server.cc | 4485 |
1 files changed, 4485 insertions, 0 deletions
diff --git a/gdbserver/server.cc b/gdbserver/server.cc new file mode 100644 index 0000000..3fc026f --- /dev/null +++ b/gdbserver/server.cc @@ -0,0 +1,4485 @@ +/* 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 */ |