/* Remote utility routines for the remote server for GDB. Copyright (C) 1986-2013 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 . */ #include "server.h" #include "terminal.h" #include "target.h" #include "gdbthread.h" #include "tdesc.h" #include "dll.h" #include #include #if HAVE_SYS_IOCTL_H #include #endif #if HAVE_SYS_FILE_H #include #endif #if HAVE_NETINET_IN_H #include #endif #if HAVE_SYS_SOCKET_H #include #endif #if HAVE_NETDB_H #include #endif #if HAVE_NETINET_TCP_H #include #endif #if HAVE_SYS_IOCTL_H #include #endif #if HAVE_SIGNAL_H #include #endif #if HAVE_FCNTL_H #include #endif #include #include #if HAVE_ARPA_INET_H #include #endif #include #if HAVE_ERRNO_H #include #endif #if USE_WIN32API #include #endif #if __QNX__ #include #endif /* __QNX__ */ #ifndef HAVE_SOCKLEN_T typedef int socklen_t; #endif #ifndef IN_PROCESS_AGENT #if USE_WIN32API # define INVALID_DESCRIPTOR INVALID_SOCKET #else # define INVALID_DESCRIPTOR -1 #endif /* 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; }; int remote_debug = 0; struct ui_file *gdb_stdlog; static int remote_is_stdio = 0; static gdb_fildes_t remote_desc = INVALID_DESCRIPTOR; static gdb_fildes_t listen_desc = INVALID_DESCRIPTOR; /* FIXME headerize? */ extern int using_threads; extern int debug_threads; /* If true, then GDB has requested noack mode. */ int noack_mode = 0; /* If true, then we tell GDB to use noack mode by default. */ int transport_is_reliable = 0; #ifdef USE_WIN32API # 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 != INVALID_DESCRIPTOR; } /* 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 int handle_accept_event (int err, gdb_client_data client_data) { struct sockaddr_in sockaddr; socklen_t tmp; if (debug_threads) fprintf (stderr, "handling possible accept event\n"); tmp = sizeof (sockaddr); remote_desc = accept (listen_desc, (struct sockaddr *) &sockaddr, &tmp); if (remote_desc == -1) perror_with_name ("Accept failed"); /* Enable TCP keep alive process. */ 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. */ fprintf (stderr, "Remote debugging from host %s\n", inet_ntoa (sockaddr.sin_addr)); enable_async_notification (remote_desc); /* Register the event loop handler. */ add_file_handler (remote_desc, handle_serial_event, NULL); /* 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); return 0; } /* Prepare for a later connection to a remote debugger. NAME is the filename used for communication. */ void remote_prepare (char *name) { char *port_str; #ifdef USE_WIN32API static int winsock_initialized; #endif int port; struct sockaddr_in sockaddr; socklen_t tmp; char *port_end; 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; transport_is_reliable = 1; return; } port_str = strchr (name, ':'); if (port_str == NULL) { transport_is_reliable = 0; return; } port = strtoul (port_str + 1, &port_end, 10); if (port_str[1] == '\0' || *port_end != '\0') fatal ("Bad port argument: %s", name); #ifdef USE_WIN32API if (!winsock_initialized) { WSADATA wsad; WSAStartup (MAKEWORD (1, 0), &wsad); winsock_initialized = 1; } #endif listen_desc = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); if (listen_desc == -1) 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)); sockaddr.sin_family = PF_INET; sockaddr.sin_port = htons (port); sockaddr.sin_addr.s_addr = INADDR_ANY; if (bind (listen_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) || listen (listen_desc, 1)) perror_with_name ("Can't bind address"); transport_is_reliable = 1; } /* Open a connection to a remote debugger. NAME is the filename used for communication. */ void remote_open (char *name) { char *port_str; port_str = strchr (name, ':'); #ifdef USE_WIN32API if (port_str == NULL) error ("Only : 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); } #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"); #ifdef HAVE_TERMIOS { 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 #ifdef HAVE_TERMIO { struct termio termio; ioctl (remote_desc, TCGETA, &termio); termio.c_iflag = 0; termio.c_oflag = 0; termio.c_lflag = 0; termio.c_cflag &= ~(CSIZE | PARENB); termio.c_cflag |= CLOCAL | CS8; termio.c_cc[VMIN] = 1; termio.c_cc[VTIME] = 0; ioctl (remote_desc, TCSETA, &termio); } #endif #ifdef HAVE_SGTTY { struct sgttyb sg; ioctl (remote_desc, TIOCGETP, &sg); sg.sg_flags = RAW; ioctl (remote_desc, TIOCSETP, &sg); } #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); } #endif /* USE_WIN32API */ else { int port; socklen_t len; struct sockaddr_in sockaddr; len = sizeof (sockaddr); if (getsockname (listen_desc, (struct sockaddr *) &sockaddr, &len) < 0 || len < sizeof (sockaddr)) perror_with_name ("Can't determine port"); port = ntohs (sockaddr.sin_port); fprintf (stderr, "Listening on port %d\n", port); fflush (stderr); /* Register the event loop handler. */ add_file_handler (listen_desc, handle_accept_event, NULL); } } void remote_close (void) { delete_file_handler (remote_desc); #ifdef USE_WIN32API closesocket (remote_desc); #else if (! remote_connection_is_stdio ()) close (remote_desc); #endif remote_desc = INVALID_DESCRIPTOR; reset_readchar (); } /* Convert hex digit A to a number. */ static int fromhex (int a) { if (a >= '0' && a <= '9') return a - '0'; else if (a >= 'a' && a <= 'f') return a - 'a' + 10; else error ("Reply contains invalid hex digit"); return 0; } #endif static const char hexchars[] = "0123456789abcdef"; static int ishex (int ch, int *val) { if ((ch >= 'a') && (ch <= 'f')) { *val = ch - 'a' + 10; return 1; } if ((ch >= 'A') && (ch <= 'F')) { *val = ch - 'A' + 10; return 1; } if ((ch >= '0') && (ch <= '9')) { *val = ch - '0'; return 1; } return 0; } #ifndef IN_PROCESS_AGENT int unhexify (char *bin, const char *hex, int count) { int i; for (i = 0; i < count; i++) { if (hex[0] == 0 || hex[1] == 0) { /* Hex string is short, or of uneven length. Return the count that has been converted so far. */ return i; } *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]); hex += 2; } return i; } 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 /* Convert number NIB to a hex digit. */ static int tohex (int nib) { if (nib < 10) return '0' + nib; else return 'a' + nib - 10; } #ifndef IN_PROCESS_AGENT int hexify (char *hex, const char *bin, int count) { int i; /* May use a length, or a nul-terminated string as input. */ if (count == 0) count = strlen (bin); for (i = 0; i < count; i++) { *hex++ = tohex ((*bin >> 4) & 0xf); *hex++ = tohex (*bin++ & 0xf); } *hex = 0; return i; } /* Convert BUFFER, binary data at least LEN bytes long, into escaped binary data in OUT_BUF. Set *OUT_LEN to the length of the data encoded in OUT_BUF, and return the number of bytes in OUT_BUF (which may be more than *OUT_LEN due to escape characters). The total number of bytes in the output buffer will be at most OUT_MAXLEN. */ int remote_escape_output (const gdb_byte *buffer, int len, gdb_byte *out_buf, int *out_len, int out_maxlen) { int input_index, output_index; output_index = 0; for (input_index = 0; input_index < len; input_index++) { gdb_byte b = buffer[input_index]; if (b == '$' || b == '#' || b == '}' || b == '*') { /* These must be escaped. */ if (output_index + 2 > out_maxlen) break; out_buf[output_index++] = '}'; out_buf[output_index++] = b ^ 0x20; } else { if (output_index + 1 > out_maxlen) break; out_buf[output_index++] = b; } } *out_len = input_index; return output_index; } /* Convert BUFFER, escaped data LEN bytes long, into binary data in OUT_BUF. Return the number of bytes written to OUT_BUF. Raise an error if the total number of bytes exceeds OUT_MAXLEN. This function reverses remote_escape_output. It allows more escaped characters than that function does, in particular because '*' must be escaped to avoid the run-length encoding processing in reading packets. */ static int remote_unescape_input (const gdb_byte *buffer, int len, gdb_byte *out_buf, int out_maxlen) { int input_index, output_index; int escaped; output_index = 0; escaped = 0; for (input_index = 0; input_index < len; input_index++) { gdb_byte b = buffer[input_index]; if (output_index + 1 > out_maxlen) error ("Received too much data from the target."); if (escaped) { out_buf[output_index++] = b ^ 0x20; escaped = 0; } else if (b == '}') escaped = 1; else out_buf[output_index++] = b; } if (escaped) error ("Unmatched escape character in target response."); return output_index; } /* 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 char * unpack_varlen_hex (char *buff, /* packet to parse */ ULONGEST *result) { int nibble; ULONGEST retval = 0; while (ishex (*buff, &nibble)) { buff++; retval = retval << 4; retval |= nibble & 0x0f; } *result = retval; return buff; } #ifndef IN_PROCESS_AGENT /* Write a PTID to BUF. Returns BUF+CHARACTERS_WRITTEN. */ char * write_ptid (char *buf, ptid_t ptid) { int pid, tid; if (multi_process) { pid = ptid_get_pid (ptid); if (pid < 0) buf += sprintf (buf, "p-%x.", -pid); else buf += sprintf (buf, "p%x.", pid); } tid = ptid_get_lwp (ptid); if (tid < 0) buf += sprintf (buf, "-%x", -tid); else buf += sprintf (buf, "%x", tid); return buf; } ULONGEST hex_or_minus_one (char *buf, char **obuf) { ULONGEST ret; if (strncmp (buf, "-1", 2) == 0) { 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 (char *buf, char **obuf) { char *p = buf; 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_build (pid, tid, 0); } /* No multi-process. Just a tid. */ tid = hex_or_minus_one (p, &pp); /* Since the stub is not sending a process id, then default to what's in the current inferior. */ pid = ptid_get_pid (current_ptid); if (obuf) *obuf = pp; return ptid_build (pid, tid, 0); } /* 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) { int i; unsigned char csum = 0; char *buf2; char *p; int cc; buf2 = 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 (noack_mode || is_notif) { /* Don't expect an ack then. */ if (remote_debug) { if (is_notif) fprintf (stderr, "putpkt (\"%s\"); [notif]\n", buf2); else fprintf (stderr, "putpkt (\"%s\"); [noack mode]\n", buf2); fflush (stderr); } break; } if (remote_debug) { fprintf (stderr, "putpkt (\"%s\"); [looking for ack]\n", buf2); fflush (stderr); } cc = readchar (); if (cc < 0) { free (buf2); return -1; } if (remote_debug) { fprintf (stderr, "[received '%c' (0x%x)]\n", cc, cc); fflush (stderr); } /* Check for an input interrupt while we're here. */ if (cc == '\003' && current_inferior != 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 != 1 || c != '\003' || current_inferior == NULL) { fprintf (stderr, "input_interrupt, count = %d c = %d ('%c')\n", cc, c, c); 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 == INVALID_DESCRIPTOR) return; input_interrupt (0); } /* Asynchronous I/O support. SIGIO must be enabled when waiting, in order to accept Control-C from the client, and must be disabled when talking to the client. */ static void unblock_async_io (void) { #ifndef USE_WIN32API sigset_t sigio_set; sigemptyset (&sigio_set); sigaddset (&sigio_set, SIGIO); sigprocmask (SIG_UNBLOCK, &sigio_set, NULL); #endif } #ifdef __QNX__ static void nto_comctrl (int enable) { struct sigevent event; if (enable) { event.sigev_notify = SIGEV_SIGNAL_THREAD; event.sigev_signo = SIGIO; event.sigev_code = 0; event.sigev_value.sival_ptr = NULL; event.sigev_priority = -1; ionotify (remote_desc, _NOTIFY_ACTION_POLLARM, _NOTIFY_COND_INPUT, &event); } else ionotify (remote_desc, _NOTIFY_ACTION_POLL, _NOTIFY_COND_INPUT, NULL); } #endif /* __QNX__ */ /* 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; #ifndef USE_WIN32API signal (SIGIO, input_interrupt); #endif async_io_enabled = 1; #ifdef __QNX__ nto_comctrl (1); #endif /* __QNX__ */ } /* Disable asynchronous I/O. */ void disable_async_io (void) { if (!async_io_enabled) return; #ifndef USE_WIN32API signal (SIGIO, SIG_IGN); #endif async_io_enabled = 0; #ifdef __QNX__ nto_comctrl (0); #endif /* __QNX__ */ } void initialize_async_io (void) { /* Make sure that async I/O starts disabled. */ async_io_enabled = 1; disable_async_io (); /* Make sure the signal is unblocked. */ unblock_async_io (); } /* 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) fprintf (stderr, "readchar: Got EOF\n"); 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_callback_event (readchar_callback); readchar_callback = NOT_SCHEDULED; } } /* Process remaining data in readchar_buf. */ static int process_remaining (void *context) { int res; /* This is a one-shot event. */ readchar_callback = NOT_SCHEDULED; if (readchar_bufcnt > 0) res = handle_serial_event (0, NULL); else res = 0; return res; } /* 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 = append_callback_event (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) { char *bp; unsigned char csum, c1, c2; int c; while (1) { csum = 0; while (1) { c = readchar (); if (c == '$') break; if (remote_debug) { fprintf (stderr, "[getpkt: discarding char '%c']\n", c); fflush (stderr); } 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 (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 (!noack_mode) { if (remote_debug) { fprintf (stderr, "getpkt (\"%s\"); [sending ack] \n", buf); fflush (stderr); } if (write_prim ("+", 1) != 1) return -1; if (remote_debug) { fprintf (stderr, "[sent ack]\n"); fflush (stderr); } } else { if (remote_debug) { fprintf (stderr, "getpkt (\"%s\"); [no ack sent] \n", buf); fflush (stderr); } } 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 void convert_int_to_ascii (const unsigned char *from, char *to, int n) { int nib; int ch; while (n--) { ch = *from++; nib = ((ch & 0xf0) >> 4) & 0x0f; *to++ = tohex (nib); nib = ch & 0x0f; *to++ = tohex (nib); } *to++ = 0; } #ifndef IN_PROCESS_AGENT void convert_ascii_to_int (const char *from, unsigned char *to, int n) { int nib1, nib2; while (n--) { nib1 = fromhex (*from++); nib2 = fromhex (*from++); *to++ = (((nib1 & 0x0f) << 4) & 0xf0) | (nib2 & 0x0f); } } 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 new_thread_notify (int id) { char own_buf[256]; /* The `n' response is not yet part of the remote protocol. Do nothing. */ if (1) return; if (server_waiting == 0) return; sprintf (own_buf, "n%x", id); disable_async_io (); putpkt (own_buf); enable_async_io (); } void dead_thread_notify (int id) { char own_buf[256]; /* The `x' response is not yet part of the remote protocol. Do nothing. */ if (1) return; sprintf (own_buf, "x%x", id); disable_async_io (); putpkt (own_buf); enable_async_io (); } void prepare_resume_reply (char *buf, ptid_t ptid, struct target_waitstatus *status) { if (debug_threads) fprintf (stderr, "Writing resume reply for %s:%d\n", target_pid_to_str (ptid), status->kind); switch (status->kind) { case TARGET_WAITKIND_STOPPED: { struct thread_info *saved_inferior; const char **regp; struct regcache *regcache; sprintf (buf, "T%02x", status->value.sig); buf += strlen (buf); saved_inferior = current_inferior; current_inferior = find_thread_ptid (ptid); regp = current_target_desc ()->expedite_regs; regcache = get_thread_regcache (current_inferior, 1); if (the_target->stopped_by_watchpoint != NULL && (*the_target->stopped_by_watchpoint) ()) { CORE_ADDR addr; int i; strncpy (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++ = ';'; } 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 || !ptid_equal (general_thread, ptid)) { int core = -1; /* In non-stop, don't change the general thread behind GDB's back. */ if (!non_stop) 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 (dlls_changed) { strcpy (buf, "library:;"); buf += strlen (buf); dlls_changed = 0; } current_inferior = saved_inferior; } break; case TARGET_WAITKIND_EXITED: if (multi_process) sprintf (buf, "W%x;process:%x", status->value.integer, ptid_get_pid (ptid)); else sprintf (buf, "W%02x", status->value.integer); break; case TARGET_WAITKIND_SIGNALLED: if (multi_process) sprintf (buf, "X%x;process:%x", status->value.sig, ptid_get_pid (ptid)); else sprintf (buf, "X%02x", status->value.sig); break; default: error ("unhandled waitkind"); break; } } void decode_m_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr) { int i = 0, j = 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; } for (j = 0; j < 4; j++) { if ((ch = from[i++]) == 0) break; *len_ptr = *len_ptr << 4; *len_ptr |= fromhex (ch) & 0x0f; } } void decode_M_packet (char *from, 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 = xmalloc (*len_ptr); convert_ascii_to_int (&from[i++], *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 = 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) { char own_buf[266], *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 (own_buf, "qSymbol:"); hexify (own_buf + strlen ("qSymbol:"), name, strlen (name)); if (putpkt (own_buf) < 0) return -1; /* FIXME: Eventually add buffer overflow checking (to getpkt?) */ len = getpkt (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 while it figures out the address of the symbol. */ while (own_buf[0] == 'm') { CORE_ADDR mem_addr; unsigned char *mem_buf; unsigned int mem_len; decode_m_packet (&own_buf[1], &mem_addr, &mem_len); mem_buf = xmalloc (mem_len); if (read_inferior_memory (mem_addr, mem_buf, mem_len) == 0) convert_int_to_ascii (mem_buf, own_buf, mem_len); else write_enn (own_buf); free (mem_buf); if (putpkt (own_buf) < 0) return -1; len = getpkt (own_buf); if (len < 0) return -1; } if (strncmp (own_buf, "qSymbol:", strlen ("qSymbol:")) != 0) { warning ("Malformed response to qSymbol, ignoring: %s\n", own_buf); return -1; } p = 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 = xmalloc (sizeof (*sym)); 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) { char own_buf[266]; int len; ULONGEST written = 0; /* Send the request. */ strcpy (own_buf, "qRelocInsn:"); sprintf (own_buf, "qRelocInsn:%s;%s", paddress (oldloc), paddress (*to)); if (putpkt (own_buf) < 0) return -1; /* FIXME: Eventually add buffer overflow checking (to getpkt?) */ len = getpkt (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 (own_buf[0] == 'm' || own_buf[0] == 'M' || own_buf[0] == 'X') { CORE_ADDR mem_addr; unsigned char *mem_buf = NULL; unsigned int mem_len; if (own_buf[0] == 'm') { decode_m_packet (&own_buf[1], &mem_addr, &mem_len); mem_buf = xmalloc (mem_len); if (read_inferior_memory (mem_addr, mem_buf, mem_len) == 0) convert_int_to_ascii (mem_buf, own_buf, mem_len); else write_enn (own_buf); } else if (own_buf[0] == 'X') { if (decode_X_packet (&own_buf[1], len - 1, &mem_addr, &mem_len, &mem_buf) < 0 || write_inferior_memory (mem_addr, mem_buf, mem_len) != 0) write_enn (own_buf); else write_ok (own_buf); } else { decode_M_packet (&own_buf[1], &mem_addr, &mem_len, &mem_buf); if (write_inferior_memory (mem_addr, mem_buf, mem_len) == 0) write_ok (own_buf); else write_enn (own_buf); } free (mem_buf); if (putpkt (own_buf) < 0) return -1; len = getpkt (own_buf); if (len < 0) return -1; } if (own_buf[0] == 'E') { warning ("An error occurred while relocating an instruction: %s\n", own_buf); return -1; } if (strncmp (own_buf, "qRelocInsn:", strlen ("qRelocInsn:")) != 0) { warning ("Malformed response to qRelocInsn, ignoring: %s\n", own_buf); return -1; } unpack_varlen_hex (own_buf + strlen ("qRelocInsn:"), &written); *to += written; return 0; } void monitor_output (const char *msg) { char *buf = xmalloc (strlen (msg) * 2 + 2); buf[0] = 'O'; hexify (buf + 1, msg, 0); putpkt (buf); free (buf); } #endif