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- /* Remote utility routines for the remote server for GDB.
- Copyright (C) 1986-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "server.h"
- #if HAVE_TERMIOS_H
- #include <termios.h>
- #endif
- #include "target.h"
- #include "gdbthread.h"
- #include "tdesc.h"
- #include "debug.h"
- #include "dll.h"
- #include "gdbsupport/rsp-low.h"
- #include "gdbsupport/netstuff.h"
- #include "gdbsupport/filestuff.h"
- #include "gdbsupport/gdb-sigmask.h"
- #include <ctype.h>
- #if HAVE_SYS_IOCTL_H
- #include <sys/ioctl.h>
- #endif
- #if HAVE_SYS_FILE_H
- #include <sys/file.h>
- #endif
- #if HAVE_NETINET_IN_H
- #include <netinet/in.h>
- #endif
- #if HAVE_SYS_SOCKET_H
- #include <sys/socket.h>
- #endif
- #if HAVE_NETDB_H
- #include <netdb.h>
- #endif
- #if HAVE_NETINET_TCP_H
- #include <netinet/tcp.h>
- #endif
- #if HAVE_SYS_IOCTL_H
- #include <sys/ioctl.h>
- #endif
- #if HAVE_SIGNAL_H
- #include <signal.h>
- #endif
- #if HAVE_FCNTL_H
- #include <fcntl.h>
- #endif
- #include "gdbsupport/gdb_sys_time.h"
- #include <unistd.h>
- #if HAVE_ARPA_INET_H
- #include <arpa/inet.h>
- #endif
- #include <sys/stat.h>
- #if USE_WIN32API
- #include <ws2tcpip.h>
- #endif
- #ifndef HAVE_SOCKLEN_T
- typedef int socklen_t;
- #endif
- #ifndef IN_PROCESS_AGENT
- /* Extra value for readchar_callback. */
- enum {
- /* The callback is currently not scheduled. */
- NOT_SCHEDULED = -1
- };
- /* Status of the readchar callback.
- Either NOT_SCHEDULED or the callback id. */
- static int readchar_callback = NOT_SCHEDULED;
- static int readchar (void);
- static void reset_readchar (void);
- static void reschedule (void);
- /* A cache entry for a successfully looked-up symbol. */
- struct sym_cache
- {
- char *name;
- CORE_ADDR addr;
- struct sym_cache *next;
- };
- static int remote_is_stdio = 0;
- static int remote_desc = -1;
- static int listen_desc = -1;
- #ifdef USE_WIN32API
- /* gnulib wraps these as macros, undo them. */
- # undef read
- # undef write
- # define read(fd, buf, len) recv (fd, (char *) buf, len, 0)
- # define write(fd, buf, len) send (fd, (char *) buf, len, 0)
- #endif
- int
- gdb_connected (void)
- {
- return remote_desc != -1;
- }
- /* Return true if the remote connection is over stdio. */
- int
- remote_connection_is_stdio (void)
- {
- return remote_is_stdio;
- }
- static void
- enable_async_notification (int fd)
- {
- #if defined(F_SETFL) && defined (FASYNC)
- int save_fcntl_flags;
- save_fcntl_flags = fcntl (fd, F_GETFL, 0);
- fcntl (fd, F_SETFL, save_fcntl_flags | FASYNC);
- #if defined (F_SETOWN)
- fcntl (fd, F_SETOWN, getpid ());
- #endif
- #endif
- }
- static void
- handle_accept_event (int err, gdb_client_data client_data)
- {
- struct sockaddr_storage sockaddr;
- socklen_t len = sizeof (sockaddr);
- threads_debug_printf ("handling possible accept event");
- remote_desc = accept (listen_desc, (struct sockaddr *) &sockaddr, &len);
- if (remote_desc == -1)
- perror_with_name ("Accept failed");
- /* Enable TCP keep alive process. */
- socklen_t tmp = 1;
- setsockopt (remote_desc, SOL_SOCKET, SO_KEEPALIVE,
- (char *) &tmp, sizeof (tmp));
- /* Tell TCP not to delay small packets. This greatly speeds up
- interactive response. */
- tmp = 1;
- setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
- (char *) &tmp, sizeof (tmp));
- #ifndef USE_WIN32API
- signal (SIGPIPE, SIG_IGN); /* If we don't do this, then gdbserver simply
- exits when the remote side dies. */
- #endif
- if (run_once)
- {
- #ifndef USE_WIN32API
- close (listen_desc); /* No longer need this */
- #else
- closesocket (listen_desc); /* No longer need this */
- #endif
- }
- /* Even if !RUN_ONCE no longer notice new connections. Still keep the
- descriptor open for add_file_handler to wait for a new connection. */
- delete_file_handler (listen_desc);
- /* Convert IP address to string. */
- char orig_host[GDB_NI_MAX_ADDR], orig_port[GDB_NI_MAX_PORT];
- int r = getnameinfo ((struct sockaddr *) &sockaddr, len,
- orig_host, sizeof (orig_host),
- orig_port, sizeof (orig_port),
- NI_NUMERICHOST | NI_NUMERICSERV);
- if (r != 0)
- fprintf (stderr, _("Could not obtain remote address: %s\n"),
- gai_strerror (r));
- else
- fprintf (stderr, _("Remote debugging from host %s, port %s\n"),
- orig_host, orig_port);
- enable_async_notification (remote_desc);
- /* Register the event loop handler. */
- add_file_handler (remote_desc, handle_serial_event, NULL, "remote-net");
- /* We have a new GDB connection now. If we were disconnected
- tracing, there's a window where the target could report a stop
- event to the event loop, and since we have a connection now, we'd
- try to send vStopped notifications to GDB. But, don't do that
- until GDB as selected all-stop/non-stop, and has queried the
- threads' status ('?'). */
- target_async (0);
- }
- /* Prepare for a later connection to a remote debugger.
- NAME is the filename used for communication. */
- void
- remote_prepare (const char *name)
- {
- client_state &cs = get_client_state ();
- #ifdef USE_WIN32API
- static int winsock_initialized;
- #endif
- socklen_t tmp;
- remote_is_stdio = 0;
- if (strcmp (name, STDIO_CONNECTION_NAME) == 0)
- {
- /* We need to record fact that we're using stdio sooner than the
- call to remote_open so start_inferior knows the connection is
- via stdio. */
- remote_is_stdio = 1;
- cs.transport_is_reliable = 1;
- return;
- }
- struct addrinfo hint;
- struct addrinfo *ainfo;
- memset (&hint, 0, sizeof (hint));
- /* Assume no prefix will be passed, therefore we should use
- AF_UNSPEC. */
- hint.ai_family = AF_UNSPEC;
- hint.ai_socktype = SOCK_STREAM;
- hint.ai_protocol = IPPROTO_TCP;
- parsed_connection_spec parsed
- = parse_connection_spec_without_prefix (name, &hint);
- if (parsed.port_str.empty ())
- {
- cs.transport_is_reliable = 0;
- return;
- }
- #ifdef USE_WIN32API
- if (!winsock_initialized)
- {
- WSADATA wsad;
- WSAStartup (MAKEWORD (1, 0), &wsad);
- winsock_initialized = 1;
- }
- #endif
- int r = getaddrinfo (parsed.host_str.c_str (), parsed.port_str.c_str (),
- &hint, &ainfo);
- if (r != 0)
- error (_("%s: cannot resolve name: %s"), name, gai_strerror (r));
- scoped_free_addrinfo freeaddrinfo (ainfo);
- struct addrinfo *iter;
- for (iter = ainfo; iter != NULL; iter = iter->ai_next)
- {
- listen_desc = gdb_socket_cloexec (iter->ai_family, iter->ai_socktype,
- iter->ai_protocol);
- if (listen_desc >= 0)
- break;
- }
- if (iter == NULL)
- perror_with_name ("Can't open socket");
- /* Allow rapid reuse of this port. */
- tmp = 1;
- setsockopt (listen_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
- sizeof (tmp));
- switch (iter->ai_family)
- {
- case AF_INET:
- ((struct sockaddr_in *) iter->ai_addr)->sin_addr.s_addr = INADDR_ANY;
- break;
- case AF_INET6:
- ((struct sockaddr_in6 *) iter->ai_addr)->sin6_addr = in6addr_any;
- break;
- default:
- internal_error (__FILE__, __LINE__,
- _("Invalid 'ai_family' %d\n"), iter->ai_family);
- }
- if (bind (listen_desc, iter->ai_addr, iter->ai_addrlen) != 0)
- perror_with_name ("Can't bind address");
- if (listen (listen_desc, 1) != 0)
- perror_with_name ("Can't listen on socket");
- cs.transport_is_reliable = 1;
- }
- /* Open a connection to a remote debugger.
- NAME is the filename used for communication. */
- void
- remote_open (const char *name)
- {
- const char *port_str;
- port_str = strchr (name, ':');
- #ifdef USE_WIN32API
- if (port_str == NULL)
- error ("Only HOST:PORT is supported on this platform.");
- #endif
- if (strcmp (name, STDIO_CONNECTION_NAME) == 0)
- {
- fprintf (stderr, "Remote debugging using stdio\n");
- /* Use stdin as the handle of the connection.
- We only select on reads, for example. */
- remote_desc = fileno (stdin);
- enable_async_notification (remote_desc);
- /* Register the event loop handler. */
- add_file_handler (remote_desc, handle_serial_event, NULL, "remote-stdio");
- }
- #ifndef USE_WIN32API
- else if (port_str == NULL)
- {
- struct stat statbuf;
- if (stat (name, &statbuf) == 0
- && (S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)))
- remote_desc = open (name, O_RDWR);
- else
- {
- errno = EINVAL;
- remote_desc = -1;
- }
- if (remote_desc < 0)
- perror_with_name ("Could not open remote device");
- #if HAVE_TERMIOS_H
- {
- struct termios termios;
- tcgetattr (remote_desc, &termios);
- termios.c_iflag = 0;
- termios.c_oflag = 0;
- termios.c_lflag = 0;
- termios.c_cflag &= ~(CSIZE | PARENB);
- termios.c_cflag |= CLOCAL | CS8;
- termios.c_cc[VMIN] = 1;
- termios.c_cc[VTIME] = 0;
- tcsetattr (remote_desc, TCSANOW, &termios);
- }
- #endif
- fprintf (stderr, "Remote debugging using %s\n", name);
- enable_async_notification (remote_desc);
- /* Register the event loop handler. */
- add_file_handler (remote_desc, handle_serial_event, NULL,
- "remote-device");
- }
- #endif /* USE_WIN32API */
- else
- {
- char listen_port[GDB_NI_MAX_PORT];
- struct sockaddr_storage sockaddr;
- socklen_t len = sizeof (sockaddr);
- if (getsockname (listen_desc, (struct sockaddr *) &sockaddr, &len) < 0)
- perror_with_name ("Can't determine port");
- int r = getnameinfo ((struct sockaddr *) &sockaddr, len,
- NULL, 0,
- listen_port, sizeof (listen_port),
- NI_NUMERICSERV);
- if (r != 0)
- fprintf (stderr, _("Can't obtain port where we are listening: %s"),
- gai_strerror (r));
- else
- fprintf (stderr, _("Listening on port %s\n"), listen_port);
- fflush (stderr);
- /* Register the event loop handler. */
- add_file_handler (listen_desc, handle_accept_event, NULL,
- "remote-listen");
- }
- }
- void
- remote_close (void)
- {
- delete_file_handler (remote_desc);
- disable_async_io ();
- #ifdef USE_WIN32API
- closesocket (remote_desc);
- #else
- if (! remote_connection_is_stdio ())
- close (remote_desc);
- #endif
- remote_desc = -1;
- reset_readchar ();
- }
- #endif
- #ifndef IN_PROCESS_AGENT
- void
- decode_address (CORE_ADDR *addrp, const char *start, int len)
- {
- CORE_ADDR addr;
- char ch;
- int i;
- addr = 0;
- for (i = 0; i < len; i++)
- {
- ch = start[i];
- addr = addr << 4;
- addr = addr | (fromhex (ch) & 0x0f);
- }
- *addrp = addr;
- }
- const char *
- decode_address_to_semicolon (CORE_ADDR *addrp, const char *start)
- {
- const char *end;
- end = start;
- while (*end != '\0' && *end != ';')
- end++;
- decode_address (addrp, start, end - start);
- if (*end == ';')
- end++;
- return end;
- }
- #endif
- #ifndef IN_PROCESS_AGENT
- /* Look for a sequence of characters which can be run-length encoded.
- If there are any, update *CSUM and *P. Otherwise, output the
- single character. Return the number of characters consumed. */
- static int
- try_rle (char *buf, int remaining, unsigned char *csum, char **p)
- {
- int n;
- /* Always output the character. */
- *csum += buf[0];
- *(*p)++ = buf[0];
- /* Don't go past '~'. */
- if (remaining > 97)
- remaining = 97;
- for (n = 1; n < remaining; n++)
- if (buf[n] != buf[0])
- break;
- /* N is the index of the first character not the same as buf[0].
- buf[0] is counted twice, so by decrementing N, we get the number
- of characters the RLE sequence will replace. */
- n--;
- if (n < 3)
- return 1;
- /* Skip the frame characters. The manual says to skip '+' and '-'
- also, but there's no reason to. Unfortunately these two unusable
- characters double the encoded length of a four byte zero
- value. */
- while (n + 29 == '$' || n + 29 == '#')
- n--;
- *csum += '*';
- *(*p)++ = '*';
- *csum += n + 29;
- *(*p)++ = n + 29;
- return n + 1;
- }
- #endif
- #ifndef IN_PROCESS_AGENT
- /* Write a PTID to BUF. Returns BUF+CHARACTERS_WRITTEN. */
- char *
- write_ptid (char *buf, ptid_t ptid)
- {
- client_state &cs = get_client_state ();
- int pid, tid;
- if (cs.multi_process)
- {
- pid = ptid.pid ();
- if (pid < 0)
- buf += sprintf (buf, "p-%x.", -pid);
- else
- buf += sprintf (buf, "p%x.", pid);
- }
- tid = ptid.lwp ();
- if (tid < 0)
- buf += sprintf (buf, "-%x", -tid);
- else
- buf += sprintf (buf, "%x", tid);
- return buf;
- }
- static ULONGEST
- hex_or_minus_one (const char *buf, const char **obuf)
- {
- ULONGEST ret;
- if (startswith (buf, "-1"))
- {
- ret = (ULONGEST) -1;
- buf += 2;
- }
- else
- buf = unpack_varlen_hex (buf, &ret);
- if (obuf)
- *obuf = buf;
- return ret;
- }
- /* Extract a PTID from BUF. If non-null, OBUF is set to the to one
- passed the last parsed char. Returns null_ptid on error. */
- ptid_t
- read_ptid (const char *buf, const char **obuf)
- {
- const char *p = buf;
- const char *pp;
- ULONGEST pid = 0, tid = 0;
- if (*p == 'p')
- {
- /* Multi-process ptid. */
- pp = unpack_varlen_hex (p + 1, &pid);
- if (*pp != '.')
- error ("invalid remote ptid: %s\n", p);
- p = pp + 1;
- tid = hex_or_minus_one (p, &pp);
- if (obuf)
- *obuf = pp;
- return ptid_t (pid, tid);
- }
- /* No multi-process. Just a tid. */
- tid = hex_or_minus_one (p, &pp);
- /* Since GDB is not sending a process id (multi-process extensions
- are off), then there's only one process. Default to the first in
- the list. */
- pid = pid_of (get_first_process ());
- if (obuf)
- *obuf = pp;
- return ptid_t (pid, tid);
- }
- /* Write COUNT bytes in BUF to the client.
- The result is the number of bytes written or -1 if error.
- This may return less than COUNT. */
- static int
- write_prim (const void *buf, int count)
- {
- if (remote_connection_is_stdio ())
- return write (fileno (stdout), buf, count);
- else
- return write (remote_desc, buf, count);
- }
- /* Read COUNT bytes from the client and store in BUF.
- The result is the number of bytes read or -1 if error.
- This may return less than COUNT. */
- static int
- read_prim (void *buf, int count)
- {
- if (remote_connection_is_stdio ())
- return read (fileno (stdin), buf, count);
- else
- return read (remote_desc, buf, count);
- }
- /* Send a packet to the remote machine, with error checking.
- The data of the packet is in BUF, and the length of the
- packet is in CNT. Returns >= 0 on success, -1 otherwise. */
- static int
- putpkt_binary_1 (char *buf, int cnt, int is_notif)
- {
- client_state &cs = get_client_state ();
- int i;
- unsigned char csum = 0;
- char *buf2;
- char *p;
- int cc;
- buf2 = (char *) xmalloc (strlen ("$") + cnt + strlen ("#nn") + 1);
- /* Copy the packet into buffer BUF2, encapsulating it
- and giving it a checksum. */
- p = buf2;
- if (is_notif)
- *p++ = '%';
- else
- *p++ = '$';
- for (i = 0; i < cnt;)
- i += try_rle (buf + i, cnt - i, &csum, &p);
- *p++ = '#';
- *p++ = tohex ((csum >> 4) & 0xf);
- *p++ = tohex (csum & 0xf);
- *p = '\0';
- /* Send it over and over until we get a positive ack. */
- do
- {
- if (write_prim (buf2, p - buf2) != p - buf2)
- {
- perror ("putpkt(write)");
- free (buf2);
- return -1;
- }
- if (cs.noack_mode || is_notif)
- {
- /* Don't expect an ack then. */
- if (is_notif)
- remote_debug_printf ("putpkt (\"%s\"); [notif]", buf2);
- else
- remote_debug_printf ("putpkt (\"%s\"); [noack mode]", buf2);
- break;
- }
- remote_debug_printf ("putpkt (\"%s\"); [looking for ack]", buf2);
- cc = readchar ();
- if (cc < 0)
- {
- free (buf2);
- return -1;
- }
- remote_debug_printf ("[received '%c' (0x%x)]", cc, cc);
- /* Check for an input interrupt while we're here. */
- if (cc == '\003' && current_thread != NULL)
- the_target->request_interrupt ();
- }
- while (cc != '+');
- free (buf2);
- return 1; /* Success! */
- }
- int
- putpkt_binary (char *buf, int cnt)
- {
- return putpkt_binary_1 (buf, cnt, 0);
- }
- /* Send a packet to the remote machine, with error checking. The data
- of the packet is in BUF, and the packet should be a NUL-terminated
- string. Returns >= 0 on success, -1 otherwise. */
- int
- putpkt (char *buf)
- {
- return putpkt_binary (buf, strlen (buf));
- }
- int
- putpkt_notif (char *buf)
- {
- return putpkt_binary_1 (buf, strlen (buf), 1);
- }
- /* Come here when we get an input interrupt from the remote side. This
- interrupt should only be active while we are waiting for the child to do
- something. Thus this assumes readchar:bufcnt is 0.
- About the only thing that should come through is a ^C, which
- will cause us to request child interruption. */
- static void
- input_interrupt (int unused)
- {
- fd_set readset;
- struct timeval immediate = { 0, 0 };
- /* Protect against spurious interrupts. This has been observed to
- be a problem under NetBSD 1.4 and 1.5. */
- FD_ZERO (&readset);
- FD_SET (remote_desc, &readset);
- if (select (remote_desc + 1, &readset, 0, 0, &immediate) > 0)
- {
- int cc;
- char c = 0;
- cc = read_prim (&c, 1);
- if (cc == 0)
- {
- fprintf (stderr, "client connection closed\n");
- return;
- }
- else if (cc != 1 || c != '\003')
- {
- fprintf (stderr, "input_interrupt, count = %d c = %d ", cc, c);
- if (isprint (c))
- fprintf (stderr, "('%c')\n", c);
- else
- fprintf (stderr, "('\\x%02x')\n", c & 0xff);
- return;
- }
- the_target->request_interrupt ();
- }
- }
- /* Check if the remote side sent us an interrupt request (^C). */
- void
- check_remote_input_interrupt_request (void)
- {
- /* This function may be called before establishing communications,
- therefore we need to validate the remote descriptor. */
- if (remote_desc == -1)
- return;
- input_interrupt (0);
- }
- /* Asynchronous I/O support. SIGIO must be unblocked when waiting,
- in order to accept Control-C from the client, and must be blocked
- when talking to the client. */
- static void
- block_unblock_async_io (int block)
- {
- #ifndef USE_WIN32API
- sigset_t sigio_set;
- sigemptyset (&sigio_set);
- sigaddset (&sigio_set, SIGIO);
- gdb_sigmask (block ? SIG_BLOCK : SIG_UNBLOCK, &sigio_set, NULL);
- #endif
- }
- /* Current state of asynchronous I/O. */
- static int async_io_enabled;
- /* Enable asynchronous I/O. */
- void
- enable_async_io (void)
- {
- if (async_io_enabled)
- return;
- block_unblock_async_io (0);
- async_io_enabled = 1;
- }
- /* Disable asynchronous I/O. */
- void
- disable_async_io (void)
- {
- if (!async_io_enabled)
- return;
- block_unblock_async_io (1);
- async_io_enabled = 0;
- }
- void
- initialize_async_io (void)
- {
- /* Make sure that async I/O starts blocked. */
- async_io_enabled = 1;
- disable_async_io ();
- /* Install the signal handler. */
- #ifndef USE_WIN32API
- signal (SIGIO, input_interrupt);
- #endif
- }
- /* Internal buffer used by readchar.
- These are global to readchar because reschedule_remote needs to be
- able to tell whether the buffer is empty. */
- static unsigned char readchar_buf[BUFSIZ];
- static int readchar_bufcnt = 0;
- static unsigned char *readchar_bufp;
- /* Returns next char from remote GDB. -1 if error. */
- static int
- readchar (void)
- {
- int ch;
- if (readchar_bufcnt == 0)
- {
- readchar_bufcnt = read_prim (readchar_buf, sizeof (readchar_buf));
- if (readchar_bufcnt <= 0)
- {
- if (readchar_bufcnt == 0)
- {
- remote_debug_printf ("readchar: Got EOF");
- }
- else
- perror ("readchar");
- return -1;
- }
- readchar_bufp = readchar_buf;
- }
- readchar_bufcnt--;
- ch = *readchar_bufp++;
- reschedule ();
- return ch;
- }
- /* Reset the readchar state machine. */
- static void
- reset_readchar (void)
- {
- readchar_bufcnt = 0;
- if (readchar_callback != NOT_SCHEDULED)
- {
- delete_timer (readchar_callback);
- readchar_callback = NOT_SCHEDULED;
- }
- }
- /* Process remaining data in readchar_buf. */
- static void
- process_remaining (void *context)
- {
- /* This is a one-shot event. */
- readchar_callback = NOT_SCHEDULED;
- if (readchar_bufcnt > 0)
- handle_serial_event (0, NULL);
- }
- /* If there is still data in the buffer, queue another event to process it,
- we can't sleep in select yet. */
- static void
- reschedule (void)
- {
- if (readchar_bufcnt > 0 && readchar_callback == NOT_SCHEDULED)
- readchar_callback = create_timer (0, process_remaining, NULL);
- }
- /* Read a packet from the remote machine, with error checking,
- and store it in BUF. Returns length of packet, or negative if error. */
- int
- getpkt (char *buf)
- {
- client_state &cs = get_client_state ();
- char *bp;
- unsigned char csum, c1, c2;
- int c;
- while (1)
- {
- csum = 0;
- while (1)
- {
- c = readchar ();
- /* The '\003' may appear before or after each packet, so
- check for an input interrupt. */
- if (c == '\003')
- {
- the_target->request_interrupt ();
- continue;
- }
- if (c == '$')
- break;
- remote_debug_printf ("[getpkt: discarding char '%c']", c);
- if (c < 0)
- return -1;
- }
- bp = buf;
- while (1)
- {
- c = readchar ();
- if (c < 0)
- return -1;
- if (c == '#')
- break;
- *bp++ = c;
- csum += c;
- }
- *bp = 0;
- c1 = fromhex (readchar ());
- c2 = fromhex (readchar ());
- if (csum == (c1 << 4) + c2)
- break;
- if (cs.noack_mode)
- {
- fprintf (stderr,
- "Bad checksum, sentsum=0x%x, csum=0x%x, "
- "buf=%s [no-ack-mode, Bad medium?]\n",
- (c1 << 4) + c2, csum, buf);
- /* Not much we can do, GDB wasn't expecting an ack/nac. */
- break;
- }
- fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
- (c1 << 4) + c2, csum, buf);
- if (write_prim ("-", 1) != 1)
- return -1;
- }
- if (!cs.noack_mode)
- {
- remote_debug_printf ("getpkt (\"%s\"); [sending ack]", buf);
- if (write_prim ("+", 1) != 1)
- return -1;
- remote_debug_printf ("[sent ack]");
- }
- else
- remote_debug_printf ("getpkt (\"%s\"); [no ack sent]", buf);
- /* The readchar above may have already read a '\003' out of the socket
- and moved it to the local buffer. For example, when GDB sends
- vCont;c immediately followed by interrupt (see
- gdb.base/interrupt-noterm.exp). As soon as we see the vCont;c, we'll
- resume the inferior and wait. Since we've already moved the '\003'
- to the local buffer, SIGIO won't help. In that case, if we don't
- check for interrupt after the vCont;c packet, the interrupt character
- would stay in the buffer unattended until after the next (unrelated)
- stop. */
- while (readchar_bufcnt > 0 && *readchar_bufp == '\003')
- {
- /* Consume the interrupt character in the buffer. */
- readchar ();
- the_target->request_interrupt ();
- }
- return bp - buf;
- }
- void
- write_ok (char *buf)
- {
- buf[0] = 'O';
- buf[1] = 'K';
- buf[2] = '\0';
- }
- void
- write_enn (char *buf)
- {
- /* Some day, we should define the meanings of the error codes... */
- buf[0] = 'E';
- buf[1] = '0';
- buf[2] = '1';
- buf[3] = '\0';
- }
- #endif
- #ifndef IN_PROCESS_AGENT
- static char *
- outreg (struct regcache *regcache, int regno, char *buf)
- {
- if ((regno >> 12) != 0)
- *buf++ = tohex ((regno >> 12) & 0xf);
- if ((regno >> 8) != 0)
- *buf++ = tohex ((regno >> 8) & 0xf);
- *buf++ = tohex ((regno >> 4) & 0xf);
- *buf++ = tohex (regno & 0xf);
- *buf++ = ':';
- collect_register_as_string (regcache, regno, buf);
- buf += 2 * register_size (regcache->tdesc, regno);
- *buf++ = ';';
- return buf;
- }
- void
- prepare_resume_reply (char *buf, ptid_t ptid, const target_waitstatus &status)
- {
- client_state &cs = get_client_state ();
- threads_debug_printf ("Writing resume reply for %s:%d",
- target_pid_to_str (ptid).c_str (), status.kind ());
- switch (status.kind ())
- {
- case TARGET_WAITKIND_STOPPED:
- case TARGET_WAITKIND_FORKED:
- case TARGET_WAITKIND_VFORKED:
- case TARGET_WAITKIND_VFORK_DONE:
- case TARGET_WAITKIND_EXECD:
- case TARGET_WAITKIND_THREAD_CREATED:
- case TARGET_WAITKIND_SYSCALL_ENTRY:
- case TARGET_WAITKIND_SYSCALL_RETURN:
- {
- const char **regp;
- struct regcache *regcache;
- char *buf_start = buf;
- if ((status.kind () == TARGET_WAITKIND_FORKED && cs.report_fork_events)
- || (status.kind () == TARGET_WAITKIND_VFORKED
- && cs.report_vfork_events))
- {
- enum gdb_signal signal = GDB_SIGNAL_TRAP;
- const char *event = (status.kind () == TARGET_WAITKIND_FORKED
- ? "fork" : "vfork");
- sprintf (buf, "T%02x%s:", signal, event);
- buf += strlen (buf);
- buf = write_ptid (buf, status.child_ptid ());
- strcat (buf, ";");
- }
- else if (status.kind () == TARGET_WAITKIND_VFORK_DONE
- && cs.report_vfork_events)
- {
- enum gdb_signal signal = GDB_SIGNAL_TRAP;
- sprintf (buf, "T%02xvforkdone:;", signal);
- }
- else if (status.kind () == TARGET_WAITKIND_EXECD && cs.report_exec_events)
- {
- enum gdb_signal signal = GDB_SIGNAL_TRAP;
- const char *event = "exec";
- char hexified_pathname[PATH_MAX * 2];
- sprintf (buf, "T%02x%s:", signal, event);
- buf += strlen (buf);
- /* Encode pathname to hexified format. */
- bin2hex ((const gdb_byte *) status.execd_pathname (),
- hexified_pathname,
- strlen (status.execd_pathname ()));
- sprintf (buf, "%s;", hexified_pathname);
- buf += strlen (buf);
- }
- else if (status.kind () == TARGET_WAITKIND_THREAD_CREATED
- && cs.report_thread_events)
- {
- enum gdb_signal signal = GDB_SIGNAL_TRAP;
- sprintf (buf, "T%02xcreate:;", signal);
- }
- else if (status.kind () == TARGET_WAITKIND_SYSCALL_ENTRY
- || status.kind () == TARGET_WAITKIND_SYSCALL_RETURN)
- {
- enum gdb_signal signal = GDB_SIGNAL_TRAP;
- const char *event = (status.kind () == TARGET_WAITKIND_SYSCALL_ENTRY
- ? "syscall_entry" : "syscall_return");
- sprintf (buf, "T%02x%s:%x;", signal, event,
- status.syscall_number ());
- }
- else
- sprintf (buf, "T%02x", status.sig ());
- if (disable_packet_T)
- {
- /* This is a bit (OK, a lot) of a kludge, however, this isn't
- really a user feature, but exists only so GDB can use the
- gdbserver to test handling of the 'S' stop reply packet, so
- we would rather this code be as simple as possible.
- By this point we've started to build the 'T' stop packet,
- and it should look like 'Txx....' where 'x' is a hex digit.
- An 'S' stop packet always looks like 'Sxx', so all we do
- here is convert the buffer from a T packet to an S packet
- and the avoid adding any extra content by breaking out. */
- gdb_assert (buf_start[0] == 'T');
- gdb_assert (isxdigit (buf_start[1]));
- gdb_assert (isxdigit (buf_start[2]));
- buf_start[0] = 'S';
- buf_start[3] = '\0';
- break;
- }
- buf += strlen (buf);
- scoped_restore_current_thread restore_thread;
- switch_to_thread (the_target, ptid);
- regp = current_target_desc ()->expedite_regs;
- regcache = get_thread_regcache (current_thread, 1);
- if (the_target->stopped_by_watchpoint ())
- {
- CORE_ADDR addr;
- int i;
- memcpy (buf, "watch:", 6);
- buf += 6;
- addr = the_target->stopped_data_address ();
- /* Convert each byte of the address into two hexadecimal
- chars. Note that we take sizeof (void *) instead of
- sizeof (addr); this is to avoid sending a 64-bit
- address to a 32-bit GDB. */
- for (i = sizeof (void *) * 2; i > 0; i--)
- *buf++ = tohex ((addr >> (i - 1) * 4) & 0xf);
- *buf++ = ';';
- }
- else if (cs.swbreak_feature && target_stopped_by_sw_breakpoint ())
- {
- sprintf (buf, "swbreak:;");
- buf += strlen (buf);
- }
- else if (cs.hwbreak_feature && target_stopped_by_hw_breakpoint ())
- {
- sprintf (buf, "hwbreak:;");
- buf += strlen (buf);
- }
- while (*regp)
- {
- buf = outreg (regcache, find_regno (regcache->tdesc, *regp), buf);
- regp ++;
- }
- *buf = '\0';
- /* Formerly, if the debugger had not used any thread features
- we would not burden it with a thread status response. This
- was for the benefit of GDB 4.13 and older. However, in
- recent GDB versions the check (``if (cont_thread != 0)'')
- does not have the desired effect because of sillyness in
- the way that the remote protocol handles specifying a
- thread. Since thread support relies on qSymbol support
- anyway, assume GDB can handle threads. */
- if (using_threads && !disable_packet_Tthread)
- {
- /* This if (1) ought to be unnecessary. But remote_wait
- in GDB will claim this event belongs to inferior_ptid
- if we do not specify a thread, and there's no way for
- gdbserver to know what inferior_ptid is. */
- if (1 || cs.general_thread != ptid)
- {
- int core = -1;
- /* In non-stop, don't change the general thread behind
- GDB's back. */
- if (!non_stop)
- cs.general_thread = ptid;
- sprintf (buf, "thread:");
- buf += strlen (buf);
- buf = write_ptid (buf, ptid);
- strcat (buf, ";");
- buf += strlen (buf);
- core = target_core_of_thread (ptid);
- if (core != -1)
- {
- sprintf (buf, "core:");
- buf += strlen (buf);
- sprintf (buf, "%x", core);
- strcat (buf, ";");
- buf += strlen (buf);
- }
- }
- }
- if (current_process ()->dlls_changed)
- {
- strcpy (buf, "library:;");
- buf += strlen (buf);
- current_process ()->dlls_changed = false;
- }
- }
- break;
- case TARGET_WAITKIND_EXITED:
- if (cs.multi_process)
- sprintf (buf, "W%x;process:%x",
- status.exit_status (), ptid.pid ());
- else
- sprintf (buf, "W%02x", status.exit_status ());
- break;
- case TARGET_WAITKIND_SIGNALLED:
- if (cs.multi_process)
- sprintf (buf, "X%x;process:%x",
- status.sig (), ptid.pid ());
- else
- sprintf (buf, "X%02x", status.sig ());
- break;
- case TARGET_WAITKIND_THREAD_EXITED:
- sprintf (buf, "w%x;", status.exit_status ());
- buf += strlen (buf);
- buf = write_ptid (buf, ptid);
- break;
- case TARGET_WAITKIND_NO_RESUMED:
- sprintf (buf, "N");
- break;
- default:
- error ("unhandled waitkind");
- break;
- }
- }
- /* See remote-utils.h. */
- const char *
- decode_m_packet_params (const char *from, CORE_ADDR *mem_addr_ptr,
- unsigned int *len_ptr, const char end_marker)
- {
- int i = 0;
- char ch;
- *mem_addr_ptr = *len_ptr = 0;
- while ((ch = from[i++]) != ',')
- {
- *mem_addr_ptr = *mem_addr_ptr << 4;
- *mem_addr_ptr |= fromhex (ch) & 0x0f;
- }
- while ((ch = from[i++]) != end_marker)
- {
- *len_ptr = *len_ptr << 4;
- *len_ptr |= fromhex (ch) & 0x0f;
- }
- return from + i;
- }
- void
- decode_m_packet (const char *from, CORE_ADDR *mem_addr_ptr,
- unsigned int *len_ptr)
- {
- decode_m_packet_params (from, mem_addr_ptr, len_ptr, '\0');
- }
- void
- decode_M_packet (const char *from, CORE_ADDR *mem_addr_ptr,
- unsigned int *len_ptr, unsigned char **to_p)
- {
- from = decode_m_packet_params (from, mem_addr_ptr, len_ptr, ':');
- if (*to_p == NULL)
- *to_p = (unsigned char *) xmalloc (*len_ptr);
- hex2bin (from, *to_p, *len_ptr);
- }
- int
- decode_X_packet (char *from, int packet_len, CORE_ADDR *mem_addr_ptr,
- unsigned int *len_ptr, unsigned char **to_p)
- {
- int i = 0;
- char ch;
- *mem_addr_ptr = *len_ptr = 0;
- while ((ch = from[i++]) != ',')
- {
- *mem_addr_ptr = *mem_addr_ptr << 4;
- *mem_addr_ptr |= fromhex (ch) & 0x0f;
- }
- while ((ch = from[i++]) != ':')
- {
- *len_ptr = *len_ptr << 4;
- *len_ptr |= fromhex (ch) & 0x0f;
- }
- if (*to_p == NULL)
- *to_p = (unsigned char *) xmalloc (*len_ptr);
- if (remote_unescape_input ((const gdb_byte *) &from[i], packet_len - i,
- *to_p, *len_ptr) != *len_ptr)
- return -1;
- return 0;
- }
- /* Decode a qXfer write request. */
- int
- decode_xfer_write (char *buf, int packet_len, CORE_ADDR *offset,
- unsigned int *len, unsigned char *data)
- {
- char ch;
- char *b = buf;
- /* Extract the offset. */
- *offset = 0;
- while ((ch = *buf++) != ':')
- {
- *offset = *offset << 4;
- *offset |= fromhex (ch) & 0x0f;
- }
- /* Get encoded data. */
- packet_len -= buf - b;
- *len = remote_unescape_input ((const gdb_byte *) buf, packet_len,
- data, packet_len);
- return 0;
- }
- /* Decode the parameters of a qSearch:memory packet. */
- int
- decode_search_memory_packet (const char *buf, int packet_len,
- CORE_ADDR *start_addrp,
- CORE_ADDR *search_space_lenp,
- gdb_byte *pattern, unsigned int *pattern_lenp)
- {
- const char *p = buf;
- p = decode_address_to_semicolon (start_addrp, p);
- p = decode_address_to_semicolon (search_space_lenp, p);
- packet_len -= p - buf;
- *pattern_lenp = remote_unescape_input ((const gdb_byte *) p, packet_len,
- pattern, packet_len);
- return 0;
- }
- static void
- free_sym_cache (struct sym_cache *sym)
- {
- if (sym != NULL)
- {
- free (sym->name);
- free (sym);
- }
- }
- void
- clear_symbol_cache (struct sym_cache **symcache_p)
- {
- struct sym_cache *sym, *next;
- /* Check the cache first. */
- for (sym = *symcache_p; sym; sym = next)
- {
- next = sym->next;
- free_sym_cache (sym);
- }
- *symcache_p = NULL;
- }
- /* Get the address of NAME, and return it in ADDRP if found. if
- MAY_ASK_GDB is false, assume symbol cache misses are failures.
- Returns 1 if the symbol is found, 0 if it is not, -1 on error. */
- int
- look_up_one_symbol (const char *name, CORE_ADDR *addrp, int may_ask_gdb)
- {
- client_state &cs = get_client_state ();
- char *p, *q;
- int len;
- struct sym_cache *sym;
- struct process_info *proc;
- proc = current_process ();
- /* Check the cache first. */
- for (sym = proc->symbol_cache; sym; sym = sym->next)
- if (strcmp (name, sym->name) == 0)
- {
- *addrp = sym->addr;
- return 1;
- }
- /* It might not be an appropriate time to look up a symbol,
- e.g. while we're trying to fetch registers. */
- if (!may_ask_gdb)
- return 0;
- /* Send the request. */
- strcpy (cs.own_buf, "qSymbol:");
- bin2hex ((const gdb_byte *) name, cs.own_buf + strlen ("qSymbol:"),
- strlen (name));
- if (putpkt (cs.own_buf) < 0)
- return -1;
- /* FIXME: Eventually add buffer overflow checking (to getpkt?) */
- len = getpkt (cs.own_buf);
- if (len < 0)
- return -1;
- /* We ought to handle pretty much any packet at this point while we
- wait for the qSymbol "response". That requires re-entering the
- main loop. For now, this is an adequate approximation; allow
- GDB to read from memory and handle 'v' packets (for vFile transfers)
- while it figures out the address of the symbol. */
- while (1)
- {
- if (cs.own_buf[0] == 'm')
- {
- CORE_ADDR mem_addr;
- unsigned char *mem_buf;
- unsigned int mem_len;
- decode_m_packet (&cs.own_buf[1], &mem_addr, &mem_len);
- mem_buf = (unsigned char *) xmalloc (mem_len);
- if (read_inferior_memory (mem_addr, mem_buf, mem_len) == 0)
- bin2hex (mem_buf, cs.own_buf, mem_len);
- else
- write_enn (cs.own_buf);
- free (mem_buf);
- if (putpkt (cs.own_buf) < 0)
- return -1;
- }
- else if (cs.own_buf[0] == 'v')
- {
- int new_len = -1;
- handle_v_requests (cs.own_buf, len, &new_len);
- if (new_len != -1)
- putpkt_binary (cs.own_buf, new_len);
- else
- putpkt (cs.own_buf);
- }
- else
- break;
- len = getpkt (cs.own_buf);
- if (len < 0)
- return -1;
- }
- if (!startswith (cs.own_buf, "qSymbol:"))
- {
- warning ("Malformed response to qSymbol, ignoring: %s", cs.own_buf);
- return -1;
- }
- p = cs.own_buf + strlen ("qSymbol:");
- q = p;
- while (*q && *q != ':')
- q++;
- /* Make sure we found a value for the symbol. */
- if (p == q || *q == '\0')
- return 0;
- decode_address (addrp, p, q - p);
- /* Save the symbol in our cache. */
- sym = XNEW (struct sym_cache);
- sym->name = xstrdup (name);
- sym->addr = *addrp;
- sym->next = proc->symbol_cache;
- proc->symbol_cache = sym;
- return 1;
- }
- /* Relocate an instruction to execute at a different address. OLDLOC
- is the address in the inferior memory where the instruction to
- relocate is currently at. On input, TO points to the destination
- where we want the instruction to be copied (and possibly adjusted)
- to. On output, it points to one past the end of the resulting
- instruction(s). The effect of executing the instruction at TO
- shall be the same as if executing it at OLDLOC. For example, call
- instructions that implicitly push the return address on the stack
- should be adjusted to return to the instruction after OLDLOC;
- relative branches, and other PC-relative instructions need the
- offset adjusted; etc. Returns 0 on success, -1 on failure. */
- int
- relocate_instruction (CORE_ADDR *to, CORE_ADDR oldloc)
- {
- client_state &cs = get_client_state ();
- int len;
- ULONGEST written = 0;
- /* Send the request. */
- sprintf (cs.own_buf, "qRelocInsn:%s;%s", paddress (oldloc),
- paddress (*to));
- if (putpkt (cs.own_buf) < 0)
- return -1;
- /* FIXME: Eventually add buffer overflow checking (to getpkt?) */
- len = getpkt (cs.own_buf);
- if (len < 0)
- return -1;
- /* We ought to handle pretty much any packet at this point while we
- wait for the qRelocInsn "response". That requires re-entering
- the main loop. For now, this is an adequate approximation; allow
- GDB to access memory. */
- while (cs.own_buf[0] == 'm' || cs.own_buf[0] == 'M' || cs.own_buf[0] == 'X')
- {
- CORE_ADDR mem_addr;
- unsigned char *mem_buf = NULL;
- unsigned int mem_len;
- if (cs.own_buf[0] == 'm')
- {
- decode_m_packet (&cs.own_buf[1], &mem_addr, &mem_len);
- mem_buf = (unsigned char *) xmalloc (mem_len);
- if (read_inferior_memory (mem_addr, mem_buf, mem_len) == 0)
- bin2hex (mem_buf, cs.own_buf, mem_len);
- else
- write_enn (cs.own_buf);
- }
- else if (cs.own_buf[0] == 'X')
- {
- if (decode_X_packet (&cs.own_buf[1], len - 1, &mem_addr,
- &mem_len, &mem_buf) < 0
- || target_write_memory (mem_addr, mem_buf, mem_len) != 0)
- write_enn (cs.own_buf);
- else
- write_ok (cs.own_buf);
- }
- else
- {
- decode_M_packet (&cs.own_buf[1], &mem_addr, &mem_len, &mem_buf);
- if (target_write_memory (mem_addr, mem_buf, mem_len) == 0)
- write_ok (cs.own_buf);
- else
- write_enn (cs.own_buf);
- }
- free (mem_buf);
- if (putpkt (cs.own_buf) < 0)
- return -1;
- len = getpkt (cs.own_buf);
- if (len < 0)
- return -1;
- }
- if (cs.own_buf[0] == 'E')
- {
- warning ("An error occurred while relocating an instruction: %s",
- cs.own_buf);
- return -1;
- }
- if (!startswith (cs.own_buf, "qRelocInsn:"))
- {
- warning ("Malformed response to qRelocInsn, ignoring: %s",
- cs.own_buf);
- return -1;
- }
- unpack_varlen_hex (cs.own_buf + strlen ("qRelocInsn:"), &written);
- *to += written;
- return 0;
- }
- void
- monitor_output (const char *msg)
- {
- int len = strlen (msg);
- char *buf = (char *) xmalloc (len * 2 + 2);
- buf[0] = 'O';
- bin2hex ((const gdb_byte *) msg, buf + 1, len);
- putpkt (buf);
- free (buf);
- }
- #endif
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