| /* Remote utility routines for the remote server for GDB. |
| Copyright (C) 1986, 1989, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
| 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 "terminal.h" |
| #include <stdio.h> |
| #include <string.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 <sys/time.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #if HAVE_ARPA_INET_H |
| #include <arpa/inet.h> |
| #endif |
| #include <sys/stat.h> |
| #if HAVE_ERRNO_H |
| #include <errno.h> |
| #endif |
| |
| #if USE_WIN32API |
| #include <winsock.h> |
| #endif |
| |
| #ifndef HAVE_SOCKLEN_T |
| typedef int socklen_t; |
| #endif |
| |
| #if USE_WIN32API |
| # define INVALID_DESCRIPTOR INVALID_SOCKET |
| #else |
| # define INVALID_DESCRIPTOR -1 |
| #endif |
| |
| /* A cache entry for a successfully looked-up symbol. */ |
| struct sym_cache |
| { |
| const char *name; |
| CORE_ADDR addr; |
| struct sym_cache *next; |
| }; |
| |
| /* The symbol cache. */ |
| static struct sym_cache *symbol_cache; |
| |
| /* If this flag has been set, assume cache misses are |
| failures. */ |
| int all_symbols_looked_up; |
| |
| int remote_debug = 0; |
| struct ui_file *gdb_stdlog; |
| |
| static int remote_desc = INVALID_DESCRIPTOR; |
| |
| /* FIXME headerize? */ |
| extern int using_threads; |
| extern int debug_threads; |
| |
| #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 |
| |
| /* Open a connection to a remote debugger. |
| NAME is the filename used for communication. */ |
| |
| void |
| remote_open (char *name) |
| { |
| #if defined(F_SETFL) && defined (FASYNC) |
| int save_fcntl_flags; |
| #endif |
| char *port_str; |
| |
| port_str = strchr (name, ':'); |
| if (port_str == NULL) |
| { |
| #ifdef USE_WIN32API |
| error ("Only <host>:<port> is supported on this platform."); |
| #else |
| 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); |
| #endif /* USE_WIN32API */ |
| } |
| else |
| { |
| #ifdef USE_WIN32API |
| static int winsock_initialized; |
| #endif |
| int port; |
| struct sockaddr_in sockaddr; |
| socklen_t tmp; |
| int tmp_desc; |
| char *port_end; |
| |
| 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 |
| |
| tmp_desc = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
| if (tmp_desc < 0) |
| perror_with_name ("Can't open socket"); |
| |
| /* Allow rapid reuse of this port. */ |
| tmp = 1; |
| setsockopt (tmp_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 (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr)) |
| || listen (tmp_desc, 1)) |
| perror_with_name ("Can't bind address"); |
| |
| /* If port is zero, a random port will be selected, and the |
| fprintf below needs to know what port was selected. */ |
| if (port == 0) |
| { |
| socklen_t len = sizeof (sockaddr); |
| if (getsockname (tmp_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); |
| |
| tmp = sizeof (sockaddr); |
| remote_desc = accept (tmp_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 |
| close (tmp_desc); /* No longer need this */ |
| |
| signal (SIGPIPE, SIG_IGN); /* If we don't do this, then gdbserver simply |
| exits when the remote side dies. */ |
| #else |
| closesocket (tmp_desc); /* No longer need this */ |
| #endif |
| |
| /* Convert IP address to string. */ |
| fprintf (stderr, "Remote debugging from host %s\n", |
| inet_ntoa (sockaddr.sin_addr)); |
| } |
| |
| #if defined(F_SETFL) && defined (FASYNC) |
| save_fcntl_flags = fcntl (remote_desc, F_GETFL, 0); |
| fcntl (remote_desc, F_SETFL, save_fcntl_flags | FASYNC); |
| #if defined (F_SETOWN) |
| fcntl (remote_desc, F_SETOWN, getpid ()); |
| #endif |
| #endif |
| } |
| |
| void |
| remote_close (void) |
| { |
| #ifdef USE_WIN32API |
| closesocket (remote_desc); |
| #else |
| close (remote_desc); |
| #endif |
| } |
| |
| /* 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; |
| } |
| |
| 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; |
| } |
| |
| /* Convert number NIB to a hex digit. */ |
| |
| static int |
| tohex (int nib) |
| { |
| if (nib < 10) |
| return '0' + nib; |
| else |
| return 'a' + nib - 10; |
| } |
| |
| 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; |
| } |
| |
| /* 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. */ |
| |
| int |
| putpkt_binary (char *buf, int cnt) |
| { |
| int i; |
| unsigned char csum = 0; |
| char *buf2; |
| char buf3[1]; |
| char *p; |
| |
| buf2 = malloc (PBUFSIZ); |
| |
| /* Copy the packet into buffer BUF2, encapsulating it |
| and giving it a checksum. */ |
| |
| p = buf2; |
| *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 |
| { |
| int cc; |
| |
| if (write (remote_desc, buf2, p - buf2) != p - buf2) |
| { |
| perror ("putpkt(write)"); |
| free (buf2); |
| return -1; |
| } |
| |
| if (remote_debug) |
| { |
| fprintf (stderr, "putpkt (\"%s\"); [looking for ack]\n", buf2); |
| fflush (stderr); |
| } |
| cc = read (remote_desc, buf3, 1); |
| if (remote_debug) |
| { |
| fprintf (stderr, "[received '%c' (0x%x)]\n", buf3[0], buf3[0]); |
| fflush (stderr); |
| } |
| |
| if (cc <= 0) |
| { |
| if (cc == 0) |
| fprintf (stderr, "putpkt(read): Got EOF\n"); |
| else |
| perror ("putpkt(read)"); |
| |
| free (buf2); |
| return -1; |
| } |
| |
| /* Check for an input interrupt while we're here. */ |
| if (buf3[0] == '\003' && current_inferior != NULL) |
| (*the_target->request_interrupt) (); |
| } |
| while (buf3[0] != '+'); |
| |
| free (buf2); |
| return 1; /* Success! */ |
| } |
| |
| /* 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)); |
| } |
| |
| /* 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. 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 (remote_desc, &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 |
| } |
| |
| /* 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; |
| } |
| |
| /* 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; |
| } |
| |
| 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 (); |
| } |
| |
| /* Returns next char from remote GDB. -1 if error. */ |
| |
| static int |
| readchar (void) |
| { |
| static unsigned char buf[BUFSIZ]; |
| static int bufcnt = 0; |
| static unsigned char *bufp; |
| |
| if (bufcnt-- > 0) |
| return *bufp++; |
| |
| bufcnt = read (remote_desc, buf, sizeof (buf)); |
| |
| if (bufcnt <= 0) |
| { |
| if (bufcnt == 0) |
| fprintf (stderr, "readchar: Got EOF\n"); |
| else |
| perror ("readchar"); |
| |
| return -1; |
| } |
| |
| bufp = buf; |
| bufcnt--; |
| return *bufp++; |
| } |
| |
| /* 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; |
| |
| fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n", |
| (c1 << 4) + c2, csum, buf); |
| write (remote_desc, "-", 1); |
| } |
| |
| if (remote_debug) |
| { |
| fprintf (stderr, "getpkt (\"%s\"); [sending ack] \n", buf); |
| fflush (stderr); |
| } |
| |
| write (remote_desc, "+", 1); |
| |
| if (remote_debug) |
| { |
| fprintf (stderr, "[sent ack]\n"); |
| 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'; |
| } |
| |
| void |
| convert_int_to_ascii (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; |
| } |
| |
| |
| void |
| convert_ascii_to_int (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 (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 (regno, buf); |
| buf += 2 * register_size (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, char status, unsigned char sig) |
| { |
| int nib; |
| |
| *buf++ = status; |
| |
| nib = ((sig & 0xf0) >> 4); |
| *buf++ = tohex (nib); |
| nib = sig & 0x0f; |
| *buf++ = tohex (nib); |
| |
| if (status == 'T') |
| { |
| const char **regp = gdbserver_expedite_regs; |
| |
| 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 (find_regno (*regp), buf); |
| regp ++; |
| } |
| |
| /* 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) |
| { |
| unsigned int gdb_id_from_wait; |
| |
| /* FIXME right place to set this? */ |
| thread_from_wait = ((struct inferior_list_entry *)current_inferior)->id; |
| gdb_id_from_wait = thread_to_gdb_id (current_inferior); |
| |
| if (debug_threads) |
| fprintf (stderr, "Writing resume reply for %ld\n\n", thread_from_wait); |
| /* 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 || old_thread_from_wait != thread_from_wait) |
| { |
| general_thread = thread_from_wait; |
| sprintf (buf, "thread:%x;", gdb_id_from_wait); |
| buf += strlen (buf); |
| old_thread_from_wait = thread_from_wait; |
| } |
| } |
| |
| if (dlls_changed) |
| { |
| strcpy (buf, "library:;"); |
| buf += strlen (buf); |
| dlls_changed = 0; |
| } |
| } |
| /* For W and X, we're done. */ |
| *buf++ = 0; |
| } |
| |
| 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) |
| { |
| 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; |
| } |
| |
| convert_ascii_to_int (&from[i++], to, *len_ptr); |
| } |
| |
| int |
| decode_X_packet (char *from, int packet_len, CORE_ADDR *mem_addr_ptr, |
| unsigned int *len_ptr, unsigned char *to) |
| { |
| 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 (remote_unescape_input ((const gdb_byte *) &from[i], packet_len - i, |
| to, *len_ptr) != *len_ptr) |
| return -1; |
| |
| return 0; |
| } |
| |
| /* Decode a qXfer write request. */ |
| int |
| decode_xfer_write (char *buf, int packet_len, char **annex, CORE_ADDR *offset, |
| unsigned int *len, unsigned char *data) |
| { |
| char ch; |
| |
| /* Extract and NUL-terminate the annex. */ |
| *annex = buf; |
| while (*buf && *buf != ':') |
| buf++; |
| if (*buf == '\0') |
| return -1; |
| *buf++ = 0; |
| |
| /* Extract the offset. */ |
| *offset = 0; |
| while ((ch = *buf++) != ':') |
| { |
| *offset = *offset << 4; |
| *offset |= fromhex (ch) & 0x0f; |
| } |
| |
| /* Get encoded data. */ |
| packet_len -= buf - *annex; |
| *len = remote_unescape_input ((const gdb_byte *) buf, packet_len, |
| data, packet_len); |
| return 0; |
| } |
| |
| /* Ask GDB for the address of NAME, and return it in ADDRP if found. |
| 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) |
| { |
| char own_buf[266], *p, *q; |
| int len; |
| struct sym_cache *sym; |
| |
| /* Check the cache first. */ |
| for (sym = symbol_cache; sym; sym = sym->next) |
| if (strcmp (name, sym->name) == 0) |
| { |
| *addrp = sym->addr; |
| return 1; |
| } |
| |
| /* If we've passed the call to thread_db_look_up_symbols, then |
| anything not in the cache must not exist; we're not interested |
| in any libraries loaded after that point, only in symbols in |
| libpthread.so. It might not be an appropriate time to look |
| up a symbol, e.g. while we're trying to fetch registers. */ |
| if (all_symbols_looked_up) |
| 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 = malloc (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 = malloc (sizeof (*sym)); |
| sym->name = strdup (name); |
| sym->addr = *addrp; |
| sym->next = symbol_cache; |
| symbol_cache = sym; |
| |
| return 1; |
| } |
| |
| void |
| monitor_output (const char *msg) |
| { |
| char *buf = malloc (strlen (msg) * 2 + 2); |
| |
| buf[0] = 'O'; |
| hexify (buf + 1, msg, 0); |
| |
| putpkt (buf); |
| free (buf); |
| } |
| |
| /* Return a malloc allocated string with special characters from TEXT |
| replaced by entity references. */ |
| |
| char * |
| xml_escape_text (const char *text) |
| { |
| char *result; |
| int i, special; |
| |
| /* Compute the length of the result. */ |
| for (i = 0, special = 0; text[i] != '\0'; i++) |
| switch (text[i]) |
| { |
| case '\'': |
| case '\"': |
| special += 5; |
| break; |
| case '&': |
| special += 4; |
| break; |
| case '<': |
| case '>': |
| special += 3; |
| break; |
| default: |
| break; |
| } |
| |
| /* Expand the result. */ |
| result = malloc (i + special + 1); |
| for (i = 0, special = 0; text[i] != '\0'; i++) |
| switch (text[i]) |
| { |
| case '\'': |
| strcpy (result + i + special, "'"); |
| special += 5; |
| break; |
| case '\"': |
| strcpy (result + i + special, """); |
| special += 5; |
| break; |
| case '&': |
| strcpy (result + i + special, "&"); |
| special += 4; |
| break; |
| case '<': |
| strcpy (result + i + special, "<"); |
| special += 3; |
| break; |
| case '>': |
| strcpy (result + i + special, ">"); |
| special += 3; |
| break; |
| default: |
| result[i + special] = text[i]; |
| break; |
| } |
| result[i + special] = '\0'; |
| |
| return result; |
| } |