diff options
Diffstat (limited to 'gdbserver/remote-utils.c')
| -rw-r--r-- | gdbserver/remote-utils.c | 1691 |
1 files changed, 1691 insertions, 0 deletions
diff --git a/gdbserver/remote-utils.c b/gdbserver/remote-utils.c new file mode 100644 index 0000000..b8a8c65 --- /dev/null +++ b/gdbserver/remote-utils.c @@ -0,0 +1,1691 @@ +/* Remote utility routines for the remote server for GDB. + Copyright (C) 1986-2020 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#include "server.h" +#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 + +#if __QNX__ +#include <sys/iomgr.h> +#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; +}; + +static int remote_is_stdio = 0; + +static gdb_fildes_t remote_desc = INVALID_DESCRIPTOR; +static gdb_fildes_t listen_desc = INVALID_DESCRIPTOR; + +#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_storage sockaddr; + socklen_t len = sizeof (sockaddr); + + if (debug_threads) + debug_printf ("handling possible accept event\n"); + + 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); + + /* 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 (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); + } +#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); + } +#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); + } +} + +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 = INVALID_DESCRIPTOR; + + 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, 0); + } + + /* 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, 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) +{ + 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 (remote_debug) + { + if (is_notif) + debug_printf ("putpkt (\"%s\"); [notif]\n", buf2); + else + debug_printf ("putpkt (\"%s\"); [noack mode]\n", buf2); + debug_flush (); + } + break; + } + + if (remote_debug) + { + debug_printf ("putpkt (\"%s\"); [looking for ack]\n", buf2); + debug_flush (); + } + + cc = readchar (); + + if (cc < 0) + { + free (buf2); + return -1; + } + + if (remote_debug) + { + debug_printf ("[received '%c' (0x%x)]\n", cc, cc); + debug_flush (); + } + + /* 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 == INVALID_DESCRIPTOR) + 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 +} + +#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; + + block_unblock_async_io (0); + + 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; + + block_unblock_async_io (1); + + async_io_enabled = 0; +#ifdef __QNX__ + nto_comctrl (0); +#endif /* __QNX__ */ + +} + +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) + { + if (remote_debug) + debug_printf ("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) +{ + 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; + if (remote_debug) + { + debug_printf ("[getpkt: discarding char '%c']\n", c); + debug_flush (); + } + + 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) + { + if (remote_debug) + { + debug_printf ("getpkt (\"%s\"); [sending ack] \n", buf); + debug_flush (); + } + + if (write_prim ("+", 1) != 1) + return -1; + + if (remote_debug) + { + debug_printf ("[sent ack]\n"); + debug_flush (); + } + } + else + { + if (remote_debug) + { + debug_printf ("getpkt (\"%s\"); [no ack sent] \n", buf); + debug_flush (); + } + } + + /* 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, + struct target_waitstatus *status) +{ + client_state &cs = get_client_state (); + if (debug_threads) + debug_printf ("Writing resume reply for %s:%d\n", + target_pid_to_str (ptid), 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: + { + struct thread_info *saved_thread; + const char **regp; + struct regcache *regcache; + + 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->value.related_pid); + 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->value.execd_pathname, + hexified_pathname, + strlen (status->value.execd_pathname)); + + sprintf (buf, "%s;", hexified_pathname); + xfree (status->value.execd_pathname); + status->value.execd_pathname = NULL; + 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->value.syscall_number); + } + else + sprintf (buf, "T%02x", status->value.sig); + + buf += strlen (buf); + + saved_thread = current_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 != NULL + && (*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 (dlls_changed) + { + strcpy (buf, "library:;"); + buf += strlen (buf); + dlls_changed = 0; + } + + current_thread = saved_thread; + } + break; + case TARGET_WAITKIND_EXITED: + if (cs.multi_process) + sprintf (buf, "W%x;process:%x", + status->value.integer, ptid.pid ()); + else + sprintf (buf, "W%02x", status->value.integer); + break; + case TARGET_WAITKIND_SIGNALLED: + if (cs.multi_process) + sprintf (buf, "X%x;process:%x", + status->value.sig, ptid.pid ()); + else + sprintf (buf, "X%02x", status->value.sig); + break; + case TARGET_WAITKIND_THREAD_EXITED: + sprintf (buf, "w%x;", status->value.integer); + buf += strlen (buf); + buf = write_ptid (buf, ptid); + break; + case TARGET_WAITKIND_NO_RESUMED: + sprintf (buf, "N"); + 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 = (unsigned char *) xmalloc (*len_ptr); + + hex2bin (&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 = (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 |