blob: 9c50929703525f25d06b6ab1ec3a74466ea2ac05 [file] [log] [blame]
/* Main code for remote server for GDB.
Copyright (C) 1989-2016 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "server.h"
#include "gdbthread.h"
#include "agent.h"
#include "notif.h"
#include "tdesc.h"
#include "rsp-low.h"
#include <ctype.h>
#include <unistd.h>
#if HAVE_SIGNAL_H
#include <signal.h>
#endif
#include "gdb_vecs.h"
#include "gdb_wait.h"
#include "btrace-common.h"
#include "filestuff.h"
#include "tracepoint.h"
#include "dll.h"
#include "hostio.h"
/* The thread set with an `Hc' packet. `Hc' is deprecated in favor of
`vCont'. Note the multi-process extensions made `vCont' a
requirement, so `Hc pPID.TID' is pretty much undefined. So
CONT_THREAD can be null_ptid for no `Hc' thread, minus_one_ptid for
resuming all threads of the process (again, `Hc' isn't used for
multi-process), or a specific thread ptid_t. */
ptid_t cont_thread;
/* The thread set with an `Hg' packet. */
ptid_t general_thread;
int server_waiting;
static int extended_protocol;
static int response_needed;
static int exit_requested;
/* --once: Exit after the first connection has closed. */
int run_once;
int multi_process;
int report_fork_events;
int report_vfork_events;
int report_exec_events;
int report_thread_events;
/* Whether to report TARGET_WAITKING_NO_RESUMED events. */
static int report_no_resumed;
int non_stop;
int swbreak_feature;
int hwbreak_feature;
/* True if the "vContSupported" feature is active. In that case, GDB
wants us to report whether single step is supported in the reply to
"vCont?" packet. */
static int vCont_supported;
/* Whether we should attempt to disable the operating system's address
space randomization feature before starting an inferior. */
int disable_randomization = 1;
static char **program_argv, **wrapper_argv;
int pass_signals[GDB_SIGNAL_LAST];
int program_signals[GDB_SIGNAL_LAST];
int program_signals_p;
/* The PID of the originally created or attached inferior. Used to
send signals to the process when GDB sends us an asynchronous interrupt
(user hitting Control-C in the client), and to wait for the child to exit
when no longer debugging it. */
unsigned long signal_pid;
#ifdef SIGTTOU
/* A file descriptor for the controlling terminal. */
int terminal_fd;
/* TERMINAL_FD's original foreground group. */
pid_t old_foreground_pgrp;
/* Hand back terminal ownership to the original foreground group. */
static void
restore_old_foreground_pgrp (void)
{
tcsetpgrp (terminal_fd, old_foreground_pgrp);
}
#endif
/* Set if you want to disable optional thread related packets support
in gdbserver, for the sake of testing GDB against stubs that don't
support them. */
int disable_packet_vCont;
int disable_packet_Tthread;
int disable_packet_qC;
int disable_packet_qfThreadInfo;
/* Last status reported to GDB. */
static struct target_waitstatus last_status;
static ptid_t last_ptid;
char *own_buf;
static unsigned char *mem_buf;
/* A sub-class of 'struct notif_event' for stop, holding information
relative to a single stop reply. We keep a queue of these to
push to GDB in non-stop mode. */
struct vstop_notif
{
struct notif_event base;
/* Thread or process that got the event. */
ptid_t ptid;
/* Event info. */
struct target_waitstatus status;
};
/* The current btrace configuration. This is gdbserver's mirror of GDB's
btrace configuration. */
static struct btrace_config current_btrace_conf;
DEFINE_QUEUE_P (notif_event_p);
/* Put a stop reply to the stop reply queue. */
static void
queue_stop_reply (ptid_t ptid, struct target_waitstatus *status)
{
struct vstop_notif *new_notif = XNEW (struct vstop_notif);
new_notif->ptid = ptid;
new_notif->status = *status;
notif_event_enque (&notif_stop, (struct notif_event *) new_notif);
}
static int
remove_all_on_match_ptid (QUEUE (notif_event_p) *q,
QUEUE_ITER (notif_event_p) *iter,
struct notif_event *event,
void *data)
{
ptid_t filter_ptid = *(ptid_t *) data;
struct vstop_notif *vstop_event = (struct vstop_notif *) event;
if (ptid_match (vstop_event->ptid, filter_ptid))
{
if (q->free_func != NULL)
q->free_func (event);
QUEUE_remove_elem (notif_event_p, q, iter);
}
return 1;
}
/* See server.h. */
void
discard_queued_stop_replies (ptid_t ptid)
{
QUEUE_iterate (notif_event_p, notif_stop.queue,
remove_all_on_match_ptid, &ptid);
}
static void
vstop_notif_reply (struct notif_event *event, char *own_buf)
{
struct vstop_notif *vstop = (struct vstop_notif *) event;
prepare_resume_reply (own_buf, vstop->ptid, &vstop->status);
}
struct notif_server notif_stop =
{
"vStopped", "Stop", NULL, vstop_notif_reply,
};
static int
target_running (void)
{
return get_first_thread () != NULL;
}
static int
start_inferior (char **argv)
{
char **new_argv = argv;
if (wrapper_argv != NULL)
{
int i, count = 1;
for (i = 0; wrapper_argv[i] != NULL; i++)
count++;
for (i = 0; argv[i] != NULL; i++)
count++;
new_argv = XALLOCAVEC (char *, count);
count = 0;
for (i = 0; wrapper_argv[i] != NULL; i++)
new_argv[count++] = wrapper_argv[i];
for (i = 0; argv[i] != NULL; i++)
new_argv[count++] = argv[i];
new_argv[count] = NULL;
}
if (debug_threads)
{
int i;
for (i = 0; new_argv[i]; ++i)
debug_printf ("new_argv[%d] = \"%s\"\n", i, new_argv[i]);
debug_flush ();
}
#ifdef SIGTTOU
signal (SIGTTOU, SIG_DFL);
signal (SIGTTIN, SIG_DFL);
#endif
signal_pid = create_inferior (new_argv[0], new_argv);
/* FIXME: we don't actually know at this point that the create
actually succeeded. We won't know that until we wait. */
fprintf (stderr, "Process %s created; pid = %ld\n", argv[0],
signal_pid);
fflush (stderr);
#ifdef SIGTTOU
signal (SIGTTOU, SIG_IGN);
signal (SIGTTIN, SIG_IGN);
terminal_fd = fileno (stderr);
old_foreground_pgrp = tcgetpgrp (terminal_fd);
tcsetpgrp (terminal_fd, signal_pid);
atexit (restore_old_foreground_pgrp);
#endif
if (wrapper_argv != NULL)
{
struct thread_resume resume_info;
memset (&resume_info, 0, sizeof (resume_info));
resume_info.thread = pid_to_ptid (signal_pid);
resume_info.kind = resume_continue;
resume_info.sig = 0;
last_ptid = mywait (pid_to_ptid (signal_pid), &last_status, 0, 0);
if (last_status.kind == TARGET_WAITKIND_STOPPED)
{
do
{
(*the_target->resume) (&resume_info, 1);
last_ptid = mywait (pid_to_ptid (signal_pid), &last_status, 0, 0);
if (last_status.kind != TARGET_WAITKIND_STOPPED)
break;
current_thread->last_resume_kind = resume_stop;
current_thread->last_status = last_status;
}
while (last_status.value.sig != GDB_SIGNAL_TRAP);
}
target_post_create_inferior ();
return signal_pid;
}
/* Wait till we are at 1st instruction in program, return new pid
(assuming success). */
last_ptid = mywait (pid_to_ptid (signal_pid), &last_status, 0, 0);
target_post_create_inferior ();
if (last_status.kind != TARGET_WAITKIND_EXITED
&& last_status.kind != TARGET_WAITKIND_SIGNALLED)
{
current_thread->last_resume_kind = resume_stop;
current_thread->last_status = last_status;
}
else
mourn_inferior (find_process_pid (ptid_get_pid (last_ptid)));
return signal_pid;
}
static int
attach_inferior (int pid)
{
/* myattach should return -1 if attaching is unsupported,
0 if it succeeded, and call error() otherwise. */
if (myattach (pid) != 0)
return -1;
fprintf (stderr, "Attached; pid = %d\n", pid);
fflush (stderr);
/* FIXME - It may be that we should get the SIGNAL_PID from the
attach function, so that it can be the main thread instead of
whichever we were told to attach to. */
signal_pid = pid;
if (!non_stop)
{
last_ptid = mywait (pid_to_ptid (pid), &last_status, 0, 0);
/* GDB knows to ignore the first SIGSTOP after attaching to a running
process using the "attach" command, but this is different; it's
just using "target remote". Pretend it's just starting up. */
if (last_status.kind == TARGET_WAITKIND_STOPPED
&& last_status.value.sig == GDB_SIGNAL_STOP)
last_status.value.sig = GDB_SIGNAL_TRAP;
current_thread->last_resume_kind = resume_stop;
current_thread->last_status = last_status;
}
return 0;
}
extern int remote_debug;
/* Decode a qXfer read request. Return 0 if everything looks OK,
or -1 otherwise. */
static int
decode_xfer_read (char *buf, CORE_ADDR *ofs, unsigned int *len)
{
/* After the read marker and annex, qXfer looks like a
traditional 'm' packet. */
decode_m_packet (buf, ofs, len);
return 0;
}
static int
decode_xfer (char *buf, char **object, char **rw, char **annex, char **offset)
{
/* Extract and NUL-terminate the object. */
*object = buf;
while (*buf && *buf != ':')
buf++;
if (*buf == '\0')
return -1;
*buf++ = 0;
/* Extract and NUL-terminate the read/write action. */
*rw = buf;
while (*buf && *buf != ':')
buf++;
if (*buf == '\0')
return -1;
*buf++ = 0;
/* Extract and NUL-terminate the annex. */
*annex = buf;
while (*buf && *buf != ':')
buf++;
if (*buf == '\0')
return -1;
*buf++ = 0;
*offset = buf;
return 0;
}
/* Write the response to a successful qXfer read. Returns the
length of the (binary) data stored in BUF, corresponding
to as much of DATA/LEN as we could fit. IS_MORE controls
the first character of the response. */
static int
write_qxfer_response (char *buf, const 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 const char *
handle_btrace_enable_bts (struct thread_info *thread)
{
if (thread->btrace != NULL)
return "E.Btrace already enabled.";
current_btrace_conf.format = BTRACE_FORMAT_BTS;
thread->btrace = target_enable_btrace (thread->entry.id,
&current_btrace_conf);
if (thread->btrace == NULL)
return "E.Could not enable btrace.";
return NULL;
}
/* Handle btrace enabling in Intel Processor Trace format. */
static const char *
handle_btrace_enable_pt (struct thread_info *thread)
{
if (thread->btrace != NULL)
return "E.Btrace already enabled.";
current_btrace_conf.format = BTRACE_FORMAT_PT;
thread->btrace = target_enable_btrace (thread->entry.id,
&current_btrace_conf);
if (thread->btrace == NULL)
return "E.Could not enable btrace.";
return NULL;
}
/* Handle btrace disabling. */
static const char *
handle_btrace_disable (struct thread_info *thread)
{
if (thread->btrace == NULL)
return "E.Branch tracing not enabled.";
if (target_disable_btrace (thread->btrace) != 0)
return "E.Could not disable branch tracing.";
thread->btrace = NULL;
return NULL;
}
/* Handle the "Qbtrace" packet. */
static int
handle_btrace_general_set (char *own_buf)
{
struct thread_info *thread;
const char *err;
char *op;
if (!startswith (own_buf, "Qbtrace:"))
return 0;
op = own_buf + strlen ("Qbtrace:");
if (ptid_equal (general_thread, null_ptid)
|| ptid_equal (general_thread, minus_one_ptid))
{
strcpy (own_buf, "E.Must select a single thread.");
return -1;
}
thread = find_thread_ptid (general_thread);
if (thread == NULL)
{
strcpy (own_buf, "E.No such thread.");
return -1;
}
err = NULL;
if (strcmp (op, "bts") == 0)
err = handle_btrace_enable_bts (thread);
else if (strcmp (op, "pt") == 0)
err = handle_btrace_enable_pt (thread);
else if (strcmp (op, "off") == 0)
err = handle_btrace_disable (thread);
else
err = "E.Bad Qbtrace operation. Use bts, pt, or off.";
if (err != 0)
strcpy (own_buf, err);
else
write_ok (own_buf);
return 1;
}
/* Handle the "Qbtrace-conf" packet. */
static int
handle_btrace_conf_general_set (char *own_buf)
{
struct thread_info *thread;
char *op;
if (!startswith (own_buf, "Qbtrace-conf:"))
return 0;
op = own_buf + strlen ("Qbtrace-conf:");
if (ptid_equal (general_thread, null_ptid)
|| ptid_equal (general_thread, minus_one_ptid))
{
strcpy (own_buf, "E.Must select a single thread.");
return -1;
}
thread = find_thread_ptid (general_thread);
if (thread == NULL)
{
strcpy (own_buf, "E.No such thread.");
return -1;
}
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)
{
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)
{
pass_signals[i] = 1;
if (*p == '\0')
/* Keep looping, to clear the remaining signals. */
cursig = -1;
else
p = decode_address_to_semicolon (&cursig, p);
}
else
pass_signals[i] = 0;
}
strcpy (own_buf, "OK");
return;
}
if (startswith (own_buf, "QProgramSignals:"))
{
int numsigs = (int) GDB_SIGNAL_LAST, i;
const char *p = own_buf + strlen ("QProgramSignals:");
CORE_ADDR cursig;
program_signals_p = 1;
p = decode_address_to_semicolon (&cursig, p);
for (i = 0; i < numsigs; i++)
{
if (i == cursig)
{
program_signals[i] = 1;
if (*p == '\0')
/* Keep looping, to clear the remaining signals. */
cursig = -1;
else
p = decode_address_to_semicolon (&cursig, p);
}
else
program_signals[i] = 0;
}
strcpy (own_buf, "OK");
return;
}
if (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 ();
VEC_truncate (int, process->syscalls_to_catch, 0);
if (enabled)
{
p += 1;
if (*p == ';')
{
p += 1;
while (*p != '\0')
{
p = decode_address_to_semicolon (&sysno, p);
VEC_safe_push (int, process->syscalls_to_catch, (int) sysno);
}
}
else
VEC_safe_push (int, process->syscalls_to_catch, ANY_SYSCALL);
}
write_ok (own_buf);
return;
}
if (strcmp (own_buf, "QStartNoAckMode") == 0)
{
if (remote_debug)
{
fprintf (stderr, "[noack mode enabled]\n");
fflush (stderr);
}
noack_mode = 1;
write_ok (own_buf);
return;
}
if (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;
if (remote_debug)
fprintf (stderr, "[%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);
disable_randomization = setting;
if (remote_debug)
{
if (disable_randomization)
fprintf (stderr, "[address space randomization disabled]\n");
else
fprintf (stderr, "[address space randomization enabled]\n");
}
write_ok (own_buf);
return;
}
if (target_supports_tracepoints ()
&& handle_tracepoint_general_set (own_buf))
return;
if (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)
fprintf (stderr, "[%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
{
char *mode_copy = xstrdup (mode);
/* We don't know what this mode is, so complain to GDB. */
sprintf (own_buf, "E.Unknown thread-events mode requested: %s\n",
mode_copy);
xfree (mode_copy);
return;
}
report_thread_events = (req == TRIBOOL_TRUE);
if (remote_debug)
{
const char *req_str = report_thread_events ? "enabled" : "disabled";
fprintf (stderr, "[thread events are now %s]\n", req_str);
}
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 (desc->xmltarget != NULL && strcmp (annex, "target.xml") == 0)
{
if (*desc->xmltarget == '@')
return desc->xmltarget + 1;
else
annex = desc->xmltarget;
}
#ifdef USE_XML
{
extern const char *const xml_builtin[][2];
int i;
/* Look for the annex. */
for (i = 0; xml_builtin[i][0] != NULL; i++)
if (strcmp (annex, xml_builtin[i][0]) == 0)
break;
if (xml_builtin[i][0] != NULL)
return xml_builtin[i][1];
}
#endif
return NULL;
}
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)
{
int res;
if (current_traceframe >= 0)
{
ULONGEST nbytes;
ULONGEST length = len;
if (traceframe_read_mem (current_traceframe,
memaddr, myaddr, len, &nbytes))
return -1;
/* Data read from trace buffer, we're done. */
if (nbytes > 0)
return nbytes;
if (!in_readonly_region (memaddr, length))
return -1;
/* Otherwise we have a valid readonly case, fall through. */
/* (assume no half-trace half-real blocks for now) */
}
res = prepare_to_access_memory ();
if (res == 0)
{
if (set_desired_thread (1))
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)
{
if (current_traceframe >= 0)
return EIO;
else
{
int ret;
ret = prepare_to_access_memory ();
if (ret == 0)
{
if (set_desired_thread (1))
ret = write_inferior_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);
}
#define require_running(BUF) \
if (!target_running ()) \
{ \
write_enn (BUF); \
return; \
}
/* Parse options to --debug-format= and "monitor set debug-format".
ARG is the text after "--debug-format=" or "monitor set debug-format".
IS_MONITOR is non-zero if we're invoked via "monitor set debug-format".
This triggers calls to monitor_output.
The result is NULL if all options were parsed ok, otherwise an error
message which the caller must free.
N.B. These commands affect all debug format settings, they are not
cumulative. If a format is not specified, it is turned off.
However, we don't go to extra trouble with things like
"monitor set debug-format all,none,timestamp".
Instead we just parse them one at a time, in order.
The syntax for "monitor set debug" we support here is not identical
to gdb's "set debug foo on|off" because we also use this function to
parse "--debug-format=foo,bar". */
static char *
parse_debug_format_options (const char *arg, int is_monitor)
{
VEC (char_ptr) *options;
int ix;
char *option;
/* First turn all debug format options off. */
debug_timestamp = 0;
/* First remove leading spaces, for "monitor set debug-format". */
while (isspace (*arg))
++arg;
options = delim_string_to_char_ptr_vec (arg, ',');
for (ix = 0; VEC_iterate (char_ptr, options, ix, option); ++ix)
{
if (strcmp (option, "all") == 0)
{
debug_timestamp = 1;
if (is_monitor)
monitor_output ("All extra debug format options enabled.\n");
}
else if (strcmp (option, "none") == 0)
{
debug_timestamp = 0;
if (is_monitor)
monitor_output ("All extra debug format options disabled.\n");
}
else if (strcmp (option, "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
{
char *msg = xstrprintf ("Unknown debug-format argument: \"%s\"\n",
option);
free_char_ptr_vec (options);
return msg;
}
}
free_char_ptr_vec (options);
return NULL;
}
/* Handle monitor commands not handled by target-specific handlers. */
static void
handle_monitor_command (char *mon, char *own_buf)
{
if (strcmp (mon, "set debug 1") == 0)
{
debug_threads = 1;
monitor_output ("Debug output enabled.\n");
}
else if (strcmp (mon, "set debug 0") == 0)
{
debug_threads = 0;
monitor_output ("Debug output disabled.\n");
}
else if (strcmp (mon, "set debug-hw-points 1") == 0)
{
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 "))
{
char *error_msg
= parse_debug_format_options (mon + sizeof ("set debug-format ") - 1,
1);
if (error_msg != NULL)
{
monitor_output (error_msg);
monitor_show_help ();
write_enn (own_buf);
xfree (error_msg);
}
}
else if (strcmp (mon, "help") == 0)
monitor_show_help ();
else if (strcmp (mon, "exit") == 0)
exit_requested = 1;
else
{
monitor_output ("Unknown monitor command.\n\n");
monitor_show_help ();
write_enn (own_buf);
}
}
/* Associates a callback with each supported qXfer'able object. */
struct qxfer
{
/* The object this handler handles. */
const char *object;
/* Request that the target transfer up to LEN 8-bit bytes of the
target's OBJECT. The OFFSET, for a seekable object, specifies
the starting point. The ANNEX can be used to provide additional
data-specific information to the target.
Return the number of bytes actually transfered, zero when no
further transfer is possible, -1 on error, -2 when the transfer
is not supported, and -3 on a verbose error message that should
be preserved. Return of a positive value smaller than LEN does
not indicate the end of the object, only the end of the transfer.
One, and only one, of readbuf or writebuf must be non-NULL. */
int (*xfer) (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len);
};
/* Handle qXfer:auxv:read. */
static int
handle_qxfer_auxv (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
if (the_target->read_auxv == NULL || writebuf != NULL)
return -2;
if (annex[0] != '\0' || 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 *const_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 (const_annex[0] == '\0')
{
if (current_thread == NULL)
return -1;
pid = pid_of (current_thread);
}
else
{
char *annex = (char *) alloca (strlen (const_annex) + 1);
strcpy (annex, const_annex);
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;
}
/* Worker routine for handle_qxfer_libraries.
Add to the length pointed to by ARG a conservative estimate of the
length needed to transmit the file name of INF. */
static void
accumulate_file_name_length (struct inferior_list_entry *inf, void *arg)
{
struct dll_info *dll = (struct dll_info *) inf;
unsigned int *total_len = (unsigned int *) arg;
/* Over-estimate the necessary memory. Assume that every character
in the library name must be escaped. */
*total_len += 128 + 6 * strlen (dll->name);
}
/* Worker routine for handle_qxfer_libraries.
Emit the XML to describe the library in INF. */
static void
emit_dll_description (struct inferior_list_entry *inf, void *arg)
{
struct dll_info *dll = (struct dll_info *) inf;
char **p_ptr = (char **) arg;
char *p = *p_ptr;
char *name;
strcpy (p, " <library name=\"");
p = p + strlen (p);
name = xml_escape_text (dll->name);
strcpy (p, name);
free (name);
p = p + strlen (p);
strcpy (p, "\"><segment address=\"");
p = p + strlen (p);
sprintf (p, "0x%lx", (long) dll->base_addr);
p = p + strlen (p);
strcpy (p, "\"/></library>\n");
p = p + strlen (p);
*p_ptr = p;
}
/* Handle qXfer:libraries:read. */
static int
handle_qxfer_libraries (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
unsigned int total_len;
char *document, *p;
if (writebuf != NULL)
return -2;
if (annex[0] != '\0' || current_thread == NULL)
return -1;
total_len = 64;
for_each_inferior_with_data (&all_dlls, accumulate_file_name_length,
&total_len);
document = (char *) malloc (total_len);
if (document == NULL)
return -1;
strcpy (document, "<library-list version=\"1.0\">\n");
p = document + strlen (document);
for_each_inferior_with_data (&all_dlls, emit_dll_description, &p);
strcpy (p, "</library-list>\n");
total_len = strlen (document);
if (offset > total_len)
{
free (document);
return -1;
}
if (offset + len > total_len)
len = total_len - offset;
memcpy (readbuf, document + offset, len);
free (document);
return len;
}
/* Handle qXfer:libraries-svr4:read. */
static int
handle_qxfer_libraries_svr4 (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
if (writebuf != NULL)
return -2;
if (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:spu:read and qXfer:spu:write. */
static int
handle_qxfer_spu (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
if (the_target->qxfer_spu == NULL)
return -2;
if (current_thread == NULL)
return -1;
return (*the_target->qxfer_spu) (annex, readbuf, writebuf, offset, len);
}
/* Handle qXfer:statictrace:read. */
static int
handle_qxfer_statictrace (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
ULONGEST nbytes;
if (writebuf != NULL)
return -2;
if (annex[0] != '\0' || current_thread == NULL || current_traceframe == -1)
return -1;
if (traceframe_read_sdata (current_traceframe, offset,
readbuf, len, &nbytes))
return -1;
return nbytes;
}
/* Helper for handle_qxfer_threads_proper.
Emit the XML to describe the thread of INF. */
static void
handle_qxfer_threads_worker (struct inferior_list_entry *inf, void *arg)
{
struct thread_info *thread = (struct thread_info *) inf;
struct buffer *buffer = (struct buffer *) arg;
ptid_t ptid = thread_to_gdb_id (thread);
char ptid_s[100];
int core = target_core_of_thread (ptid);
char core_s[21];
const char *name = target_thread_name (ptid);
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);
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_inferior_with_data (&all_threads, handle_qxfer_threads_worker,
buffer);
buffer_grow_str0 (buffer, "</threads>\n");
}
/* Handle qXfer:threads:read. */
static int
handle_qxfer_threads (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
static char *result = 0;
static unsigned int result_length = 0;
if (writebuf != NULL)
return -2;
if (annex[0] != '\0')
return -1;
if (offset == 0)
{
struct buffer buffer;
/* When asked for data at offset 0, generate everything and store into
'result'. Successive reads will be served off 'result'. */
if (result)
free (result);
buffer_init (&buffer);
handle_qxfer_threads_proper (&buffer);
result = buffer_finish (&buffer);
result_length = strlen (result);
buffer_free (&buffer);
}
if (offset >= result_length)
{
/* We're out of data. */
free (result);
result = NULL;
result_length = 0;
return 0;
}
if (len > result_length - offset)
len = result_length - offset;
memcpy (readbuf, result + offset, len);
return len;
}
/* Handle qXfer:traceframe-info:read. */
static int
handle_qxfer_traceframe_info (const char *annex,
gdb_byte *readbuf, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
static char *result = 0;
static unsigned int result_length = 0;
if (writebuf != NULL)
return -2;
if (!target_running () || annex[0] != '\0' || current_traceframe == -1)
return -1;
if (offset == 0)
{
struct buffer buffer;
/* When asked for data at offset 0, generate everything and
store into 'result'. Successive reads will be served off
'result'. */
free (result);
buffer_init (&buffer);
traceframe_read_info (current_traceframe, &buffer);
result = buffer_finish (&buffer);
result_length = strlen (result);
buffer_free (&buffer);
}
if (offset >= result_length)
{
/* We're out of data. */
free (result);
result = NULL;
result_length = 0;
return 0;
}
if (len > result_length - offset)
len = result_length - offset;
memcpy (readbuf, result + offset, len);
return len;
}
/* Handle qXfer:fdpic:read. */
static int
handle_qxfer_fdpic (const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
{
if (the_target->read_loadmap == NULL)
return -2;
if (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)
{
static struct buffer cache;
struct thread_info *thread;
enum btrace_read_type type;
int result;
if (the_target->read_btrace == NULL || writebuf != NULL)
return -2;
if (ptid_equal (general_thread, null_ptid)
|| ptid_equal (general_thread, minus_one_ptid))
{
strcpy (own_buf, "E.Must select a single thread.");
return -3;
}
thread = find_thread_ptid (general_thread);
if (thread == NULL)
{
strcpy (own_buf, "E.No such thread.");
return -3;
}
if (thread->btrace == NULL)
{
strcpy (own_buf, "E.Btrace not enabled.");
return -3;
}
if (strcmp (annex, "all") == 0)
type = BTRACE_READ_ALL;
else if (strcmp (annex, "new") == 0)
type = BTRACE_READ_NEW;
else if (strcmp (annex, "delta") == 0)
type = BTRACE_READ_DELTA;
else
{
strcpy (own_buf, "E.Bad annex.");
return -3;
}
if (offset == 0)
{
buffer_free (&cache);
result = target_read_btrace (thread->btrace, &cache, type);
if (result != 0)
{
memcpy (own_buf, cache.buffer, cache.used_size);
return -3;
}
}
else if (offset > cache.used_size)
{
buffer_free (&cache);
return -3;
}
if (len > cache.used_size - offset)
len = cache.used_size - offset;
memcpy (readbuf, cache.buffer + offset, len);
return len;
}
/* 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)
{
static struct buffer cache;
struct thread_info *thread;
int result;
if (the_target->read_btrace_conf == NULL || writebuf != NULL)
return -2;
if (annex[0] != '\0')
return -1;
if (ptid_equal (general_thread, null_ptid)
|| ptid_equal (general_thread, minus_one_ptid))
{
strcpy (own_buf, "E.Must select a single thread.");
return -3;
}
thread = find_thread_ptid (general_thread);
if (thread == NULL)
{
strcpy (own_buf, "E.No such thread.");
return -3;
}
if (thread->btrace == NULL)
{
strcpy (own_buf, "E.Btrace not enabled.");
return -3;
}
if (offset == 0)
{
buffer_free (&cache);
result = target_read_btrace_conf (thread->btrace, &cache);
if (result != 0)
{
memcpy (own_buf, cache.buffer, cache.used_size);
return -3;
}
}
else if (offset > cache.used_size)
{
buffer_free (&cache);
return -3;
}
if (len > cache.used_size - offset)
len = cache.used_size - offset;
memcpy (readbuf, cache.buffer + offset, len);
return len;
}
static const struct qxfer qxfer_packets[] =
{
{ "auxv", handle_qxfer_auxv },
{ "btrace", handle_qxfer_btrace },
{ "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 },
{ "spu", handle_qxfer_spu },
{ "statictrace", handle_qxfer_statictrace },
{ "threads", handle_qxfer_threads },
{ "traceframe-info", handle_qxfer_traceframe_info },
};
static int
handle_qxfer (char *own_buf, int packet_len, int *new_packet_len_p)
{
int i;
char *object;
char *rw;
char *annex;
char *offset;
if (!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)
{
int btrace_supported = 0;
if (target_supports_btrace (BTRACE_FORMAT_BTS))
{
strcat (buf, ";Qbtrace:bts+");
strcat (buf, ";Qbtrace-conf:bts:size+");
btrace_supported = 1;
}
if (target_supports_btrace (BTRACE_FORMAT_PT))
{
strcat (buf, ";Qbtrace:pt+");
strcat (buf, ";Qbtrace-conf:pt:size+");
btrace_supported = 1;
}
if (!btrace_supported)
return;
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)
{
static struct inferior_list_entry *thread_ptr;
/* Reply the current thread id. */
if (strcmp ("qC", own_buf) == 0 && !disable_packet_qC)
{
ptid_t gdb_id;
require_running (own_buf);
if (!ptid_equal (general_thread, null_ptid)
&& !ptid_equal (general_thread, minus_one_ptid))
gdb_id = general_thread;
else
{
thread_ptr = get_first_inferior (&all_threads);
gdb_id = thread_to_gdb_id ((struct thread_info *)thread_ptr);
}
sprintf (own_buf, "QC");
own_buf += 2;
write_ptid (own_buf, gdb_id);
return;
}
if (strcmp ("qSymbol::", own_buf) == 0)
{
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 (ptid_get_pid (general_thread));
/* Just in case, if we didn't find a thread, then bail out
instead of crashing. */
if (current_thread == NULL)
{
write_enn (own_buf);
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)
{
ptid_t gdb_id;
require_running (own_buf);
thread_ptr = get_first_inferior (&all_threads);
*own_buf++ = 'm';
gdb_id = thread_to_gdb_id ((struct thread_info *)thread_ptr);
write_ptid (own_buf, gdb_id);
thread_ptr = thread_ptr->next;
return;
}
if (strcmp ("qsThreadInfo", own_buf) == 0)
{
ptid_t gdb_id;
require_running (own_buf);
if (thread_ptr != NULL)
{
*own_buf++ = 'm';
gdb_id = thread_to_gdb_id ((struct thread_info *)thread_ptr);
write_ptid (own_buf, gdb_id);
thread_ptr = thread_ptr->next;
return;
}
else
{
sprintf (own_buf, "l");
return;
}
}
}
if (the_target->read_offsets != NULL
&& strcmp ("qOffsets", own_buf) == 0)
{
CORE_ADDR text, data;
require_running (own_buf);
if (the_target->read_offsets (&text, &data))
sprintf (own_buf, "Text=%lX;Data=%lX;Bss=%lX",
(long)text, (long)data, (long)data);
else
write_enn (own_buf);
return;
}
/* Protocol features query. */
if (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. */
for (p = strtok (p + 1, ";");
p != NULL;
p = strtok (NULL, ";"))
{
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 ())
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 ())
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 ())
hwbreak_feature = 1;
}
else if (strcmp (p, "fork-events+") == 0)
{
/* GDB supports and wants fork events if possible. */
if (target_supports_fork_events ())
report_fork_events = 1;
}
else if (strcmp (p, "vfork-events+") == 0)
{
/* GDB supports and wants vfork events if possible. */
if (target_supports_vfork_events ())
report_vfork_events = 1;
}
else if (strcmp (p, "exec-events+") == 0)
{
/* GDB supports and wants exec events if possible. */
if (target_supports_exec_events ())
report_exec_events = 1;
}
else if (strcmp (p, "vContSupported+") == 0)
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 = 1;
}
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+",
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_spu != NULL)
strcat (own_buf, ";qXfer:spu:read+;qXfer:spu:write+");
if (the_target->qxfer_siginfo != NULL)
strcat (own_buf, ";qXfer:siginfo:read+;qXfer:siginfo:write+");
if (the_target->read_loadmap != NULL)
strcat (own_buf, ";qXfer:fdpic:read+");
/* We always report qXfer:features:read, as targets may
install XML files on a subsequent call to arch_setup.
If we reported to GDB on startup that we don't support
qXfer:feature:read at all, we will never be re-queried. */
strcat (own_buf, ";qXfer:features:read+");
if (transport_is_reliable)
strcat (own_buf, ";QStartNoAckMode+");
if (the_target->qxfer_osdata != NULL)
strcat (own_buf, ";qXfer:osdata:read+");
if (target_supports_multi_process ())
strcat (own_buf, ";multiprocess+");
if (target_supports_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 (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:"))
{
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 (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 = (struct process_info *)
find_inferior_id (&all_processes, pid_to_ptid (pid));
}
else
{
require_running (own_buf);
process = current_process ();
}
if (process == NULL)
{
write_enn (own_buf);
return;
}
strcpy (own_buf, process->attached ? "1" : "0");
return;
}
if (startswith (own_buf, "qCRC:"))
{
/* CRC check (compare-section). */
char *comma;
ULONGEST base;
int len;
unsigned long long crc;
require_running (own_buf);
comma = unpack_varlen_hex (own_buf + 5, &base);
if (*comma++ != ',')
{
write_enn (own_buf);
return;
}
len = strtoul (comma, NULL, 16);
crc = crc32 (base, len, 0xffffffff);
/* Check for memory failure. */
if (crc == (unsigned long long) -1)
{
write_enn (own_buf);
return;
}
sprintf (own_buf, "C%lx", (unsigned long) crc);
return;
}
if (handle_qxfer (own_buf, packet_len, new_packet_len_p))
return;
if (target_supports_tracepoints () && handle_tracepoint_query (own_buf))
return;
/* Otherwise we didn't know what packet it was. Say we didn't
understand it. */
own_buf[0] = 0;
}
static void gdb_wants_all_threads_stopped (void);
static void resume (struct thread_resume *actions, size_t n);
/* The callback that is passed to visit_actioned_threads. */
typedef int (visit_actioned_threads_callback_ftype)
(const struct thread_resume *, struct thread_info *);
/* Struct to pass data to visit_actioned_threads. */
struct visit_actioned_threads_data
{
const struct thread_resume *actions;
size_t num_actions;
visit_actioned_threads_callback_ftype *callback;
};
/* Call CALLBACK for any thread to which ACTIONS applies to. Returns
true if CALLBACK returns true. Returns false if no matching thread
is found or CALLBACK results false.
Note: This function is itself a callback for find_inferior. */
static int
visit_actioned_threads (struct inferior_list_entry *entry, void *datap)
{
struct visit_actioned_threads_data *data
= (struct visit_actioned_threads_data *) datap;
const struct thread_resume *actions = data->actions;
size_t num_actions = data->num_actions;
visit_actioned_threads_callback_ftype *callback = data->callback;
size_t i;
for (i = 0; i < num_actions; i++)
{
const struct thread_resume *action = &actions[i];
if (ptid_equal (action->thread, minus_one_ptid)
|| ptid_equal (action->thread, entry->id)
|| ((ptid_get_pid (action->thread)
== ptid_get_pid (entry->id))
&& ptid_get_lwp (action->thread) == -1))
{
struct thread_info *thread = (struct thread_info *) entry;
if ((*callback) (action, thread))
return 1;
}
}
return 0;
}
/* Callback for visit_actioned_threads. If the thread has a pending
status to report, report it now. */
static int
handle_pending_status (const struct thread_resume *resumption,
struct thread_info *thread)
{
if (thread->status_pending_p)
{
thread->status_pending_p = 0;
last_status = thread->last_status;
last_ptid = thread->entry.id;
prepare_resume_reply (own_buf, last_ptid, &last_status);
return 1;
}
return 0;
}
/* Parse vCont packets. */
static void
handle_v_cont (char *own_buf)
{
char *p, *q;
int n = 0, i = 0;
struct thread_resume *resume_info;
struct thread_resume default_action = {{0}};
/* Count the number of semicolons in the packet. There should be one
for every action. */
p = &own_buf[5];
while (p)
{
n++;
p++;
p = strchr (p, ';');
}
resume_info = (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')
{
int sig;
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] == ':')
{
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)
{
if (!non_stop)
{
/* Check if among the threads that GDB wants actioned, there's
one with a pending status to report. If so, skip actually
resuming/stopping and report the pending event
immediately. */
struct visit_actioned_threads_data data;
data.actions = actions;
data.num_actions = num_actions;
data.callback = handle_pending_status;
if (find_inferior (&all_threads, visit_actioned_threads, &data) != NULL)
return;
enable_async_io ();
}
(*the_target->resume) (actions, num_actions);
if (non_stop)
write_ok (own_buf);
else
{
last_ptid = mywait (minus_one_ptid, &last_status, 0, 1);
if (last_status.kind == TARGET_WAITKIND_NO_RESUMED
&& !report_no_resumed)
{
/* The client does not support this stop reply. At least
return error. */
sprintf (own_buf, "E.No unwaited-for children left.");
disable_async_io ();
return;
}
if (last_status.kind != TARGET_WAITKIND_EXITED
&& last_status.kind != TARGET_WAITKIND_SIGNALLED
&& last_status.kind != TARGET_WAITKIND_NO_RESUMED)
current_thread->last_status = last_status;
/* From the client's perspective, all-stop mode always stops all
threads implicitly (and the target backend has already done
so by now). Tag all threads as "want-stopped", so we don't
resume them implicitly without the client telling us to. */
gdb_wants_all_threads_stopped ();
prepare_resume_reply (own_buf, last_ptid, &last_status);
disable_async_io ();
if (last_status.kind == TARGET_WAITKIND_EXITED
|| last_status.kind == TARGET_WAITKIND_SIGNALLED)
mourn_inferior (find_process_pid (ptid_get_pid (last_ptid)));
}
}
/* Attach to a new program. Return 1 if successful, 0 if failure. */
static int
handle_v_attach (char *own_buf)
{
int pid;
pid = strtol (own_buf + 8, NULL, 16);
if (pid != 0 && attach_inferior (pid) == 0)
{
/* Don't report shared library events after attaching, even if
some libraries are preloaded. GDB will always poll the
library list. Avoids the "stopped by shared library event"
notice on the GDB side. */
dlls_changed = 0;
if (non_stop)
{
/* In non-stop, we don't send a resume reply. Stop events
will follow up using the normal notification
mechanism. */
write_ok (own_buf);
}
else
prepare_resume_reply (own_buf, last_ptid, &last_status);
return 1;
}
else
{
write_enn (own_buf);
return 0;
}
}
/* Run a new program. Return 1 if successful, 0 if failure. */
static int
handle_v_run (char *own_buf)
{
char *p, *next_p, **new_argv;
int i, new_argc;
new_argc = 0;
for (p = own_buf + strlen ("vRun;"); p && *p; p = strchr (p, ';'))
{
p++;
new_argc++;
}
new_argv = (char **) calloc (new_argc + 2, sizeof (char *));
if (new_argv == NULL)
{
write_enn (own_buf);
return 0;
}
i = 0;
for (p = own_buf + strlen ("vRun;"); *p; p = next_p)
{
next_p = strchr (p, ';');
if (next_p == NULL)
next_p = p + strlen (p);
if (i == 0 && p == next_p)
new_argv[i] = NULL;
else
{
/* FIXME: Fail request if out of memory instead of dying. */
new_argv[i] = (char *) xmalloc (1 + (next_p - p) / 2);