785 lines
16 KiB
C
785 lines
16 KiB
C
/* Remote utility routines for the remote server for GDB.
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Copyright 1986, 1989, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
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2002, 2003, 2004
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "server.h"
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#include "terminal.h"
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#include <stdio.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/tcp.h>
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#include <sys/ioctl.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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/* A cache entry for a successfully looked-up symbol. */
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struct sym_cache
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{
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const char *name;
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CORE_ADDR addr;
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struct sym_cache *next;
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};
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/* The symbol cache. */
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static struct sym_cache *symbol_cache;
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int remote_debug = 0;
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struct ui_file *gdb_stdlog;
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static int remote_desc;
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/* FIXME headerize? */
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extern int using_threads;
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extern int debug_threads;
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/* Open a connection to a remote debugger.
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NAME is the filename used for communication. */
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void
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remote_open (char *name)
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{
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int save_fcntl_flags;
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if (!strchr (name, ':'))
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{
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remote_desc = open (name, O_RDWR);
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if (remote_desc < 0)
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perror_with_name ("Could not open remote device");
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#ifdef HAVE_TERMIOS
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{
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struct termios termios;
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tcgetattr (remote_desc, &termios);
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termios.c_iflag = 0;
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termios.c_oflag = 0;
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termios.c_lflag = 0;
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termios.c_cflag &= ~(CSIZE | PARENB);
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termios.c_cflag |= CLOCAL | CS8;
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termios.c_cc[VMIN] = 1;
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termios.c_cc[VTIME] = 0;
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tcsetattr (remote_desc, TCSANOW, &termios);
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}
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#endif
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#ifdef HAVE_TERMIO
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{
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struct termio termio;
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ioctl (remote_desc, TCGETA, &termio);
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termio.c_iflag = 0;
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termio.c_oflag = 0;
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termio.c_lflag = 0;
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termio.c_cflag &= ~(CSIZE | PARENB);
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termio.c_cflag |= CLOCAL | CS8;
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termio.c_cc[VMIN] = 1;
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termio.c_cc[VTIME] = 0;
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ioctl (remote_desc, TCSETA, &termio);
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}
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#endif
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#ifdef HAVE_SGTTY
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{
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struct sgttyb sg;
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ioctl (remote_desc, TIOCGETP, &sg);
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sg.sg_flags = RAW;
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ioctl (remote_desc, TIOCSETP, &sg);
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}
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#endif
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fprintf (stderr, "Remote debugging using %s\n", name);
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}
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else
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{
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char *port_str;
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int port;
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struct sockaddr_in sockaddr;
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int tmp;
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int tmp_desc;
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port_str = strchr (name, ':');
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port = atoi (port_str + 1);
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tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
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if (tmp_desc < 0)
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perror_with_name ("Can't open socket");
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/* Allow rapid reuse of this port. */
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tmp = 1;
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setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
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sizeof (tmp));
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sockaddr.sin_family = PF_INET;
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sockaddr.sin_port = htons (port);
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sockaddr.sin_addr.s_addr = INADDR_ANY;
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if (bind (tmp_desc, (struct sockaddr *) &sockaddr, sizeof (sockaddr))
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|| listen (tmp_desc, 1))
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perror_with_name ("Can't bind address");
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fprintf (stderr, "Listening on port %d\n", port);
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tmp = sizeof (sockaddr);
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remote_desc = accept (tmp_desc, (struct sockaddr *) &sockaddr, &tmp);
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if (remote_desc == -1)
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perror_with_name ("Accept failed");
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/* Enable TCP keep alive process. */
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tmp = 1;
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setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *) &tmp, sizeof (tmp));
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/* Tell TCP not to delay small packets. This greatly speeds up
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interactive response. */
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tmp = 1;
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setsockopt (remote_desc, IPPROTO_TCP, TCP_NODELAY,
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(char *) &tmp, sizeof (tmp));
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close (tmp_desc); /* No longer need this */
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signal (SIGPIPE, SIG_IGN); /* If we don't do this, then gdbserver simply
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exits when the remote side dies. */
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/* Convert IP address to string. */
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fprintf (stderr, "Remote debugging from host %s\n",
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inet_ntoa (sockaddr.sin_addr));
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}
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#if defined(F_SETFL) && defined (FASYNC)
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save_fcntl_flags = fcntl (remote_desc, F_GETFL, 0);
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fcntl (remote_desc, F_SETFL, save_fcntl_flags | FASYNC);
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#if defined (F_SETOWN)
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fcntl (remote_desc, F_SETOWN, getpid ());
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#endif
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#endif
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disable_async_io ();
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}
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void
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remote_close (void)
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{
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close (remote_desc);
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}
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/* Convert hex digit A to a number. */
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static int
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fromhex (int a)
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{
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if (a >= '0' && a <= '9')
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return a - '0';
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else if (a >= 'a' && a <= 'f')
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return a - 'a' + 10;
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else
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error ("Reply contains invalid hex digit");
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return 0;
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}
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int
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unhexify (char *bin, const char *hex, int count)
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{
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int i;
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for (i = 0; i < count; i++)
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{
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if (hex[0] == 0 || hex[1] == 0)
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{
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/* Hex string is short, or of uneven length.
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Return the count that has been converted so far. */
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return i;
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}
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*bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]);
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hex += 2;
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}
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return i;
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}
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static void
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decode_address (CORE_ADDR *addrp, const char *start, int len)
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{
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CORE_ADDR addr;
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char ch;
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int i;
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addr = 0;
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for (i = 0; i < len; i++)
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{
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ch = start[i];
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addr = addr << 4;
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addr = addr | (fromhex (ch) & 0x0f);
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}
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*addrp = addr;
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}
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/* Convert number NIB to a hex digit. */
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static int
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tohex (int nib)
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{
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if (nib < 10)
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return '0' + nib;
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else
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return 'a' + nib - 10;
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}
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int
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hexify (char *hex, const char *bin, int count)
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{
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int i;
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/* May use a length, or a nul-terminated string as input. */
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if (count == 0)
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count = strlen (bin);
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for (i = 0; i < count; i++)
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{
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*hex++ = tohex ((*bin >> 4) & 0xf);
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*hex++ = tohex (*bin++ & 0xf);
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}
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*hex = 0;
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return i;
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}
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/* Send a packet to the remote machine, with error checking.
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The data of the packet is in BUF. Returns >= 0 on success, -1 otherwise. */
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int
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putpkt (char *buf)
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{
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int i;
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unsigned char csum = 0;
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char *buf2;
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char buf3[1];
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int cnt = strlen (buf);
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char *p;
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buf2 = malloc (PBUFSIZ);
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/* Copy the packet into buffer BUF2, encapsulating it
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and giving it a checksum. */
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p = buf2;
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*p++ = '$';
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for (i = 0; i < cnt; i++)
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{
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csum += buf[i];
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*p++ = buf[i];
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}
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*p++ = '#';
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*p++ = tohex ((csum >> 4) & 0xf);
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*p++ = tohex (csum & 0xf);
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*p = '\0';
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/* Send it over and over until we get a positive ack. */
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do
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{
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int cc;
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if (write (remote_desc, buf2, p - buf2) != p - buf2)
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{
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perror ("putpkt(write)");
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return -1;
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}
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if (remote_debug)
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{
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fprintf (stderr, "putpkt (\"%s\"); [looking for ack]\n", buf2);
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fflush (stderr);
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}
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cc = read (remote_desc, buf3, 1);
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if (remote_debug)
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{
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fprintf (stderr, "[received '%c' (0x%x)]\n", buf3[0], buf3[0]);
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fflush (stderr);
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}
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if (cc <= 0)
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{
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if (cc == 0)
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fprintf (stderr, "putpkt(read): Got EOF\n");
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else
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perror ("putpkt(read)");
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free (buf2);
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return -1;
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}
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/* Check for an input interrupt while we're here. */
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if (buf3[0] == '\003')
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(*the_target->send_signal) (SIGINT);
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}
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while (buf3[0] != '+');
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free (buf2);
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return 1; /* Success! */
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}
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/* Come here when we get an input interrupt from the remote side. This
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interrupt should only be active while we are waiting for the child to do
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something. About the only thing that should come through is a ^C, which
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will cause us to send a SIGINT to the child. */
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static void
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input_interrupt (int unused)
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{
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fd_set readset;
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struct timeval immediate = { 0, 0 };
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/* Protect against spurious interrupts. This has been observed to
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be a problem under NetBSD 1.4 and 1.5. */
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FD_ZERO (&readset);
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FD_SET (remote_desc, &readset);
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if (select (remote_desc + 1, &readset, 0, 0, &immediate) > 0)
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{
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int cc;
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char c = 0;
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cc = read (remote_desc, &c, 1);
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if (cc != 1 || c != '\003')
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{
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fprintf (stderr, "input_interrupt, count = %d c = %d ('%c')\n",
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cc, c, c);
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return;
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}
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(*the_target->send_signal) (SIGINT);
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}
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}
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void
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block_async_io (void)
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{
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sigset_t sigio_set;
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sigemptyset (&sigio_set);
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sigaddset (&sigio_set, SIGIO);
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sigprocmask (SIG_BLOCK, &sigio_set, NULL);
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}
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void
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unblock_async_io (void)
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{
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sigset_t sigio_set;
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sigemptyset (&sigio_set);
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sigaddset (&sigio_set, SIGIO);
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sigprocmask (SIG_UNBLOCK, &sigio_set, NULL);
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}
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/* Asynchronous I/O support. SIGIO must be enabled when waiting, in order to
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accept Control-C from the client, and must be disabled when talking to
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the client. */
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/* Current state of asynchronous I/O. */
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static int async_io_enabled;
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/* Enable asynchronous I/O. */
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void
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enable_async_io (void)
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{
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if (async_io_enabled)
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return;
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signal (SIGIO, input_interrupt);
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async_io_enabled = 1;
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}
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/* Disable asynchronous I/O. */
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void
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disable_async_io (void)
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{
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if (!async_io_enabled)
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return;
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signal (SIGIO, SIG_IGN);
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async_io_enabled = 0;
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}
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/* Returns next char from remote GDB. -1 if error. */
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static int
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readchar (void)
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{
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static char buf[BUFSIZ];
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static int bufcnt = 0;
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static char *bufp;
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if (bufcnt-- > 0)
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return *bufp++ & 0x7f;
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bufcnt = read (remote_desc, buf, sizeof (buf));
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if (bufcnt <= 0)
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{
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if (bufcnt == 0)
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fprintf (stderr, "readchar: Got EOF\n");
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else
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perror ("readchar");
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return -1;
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}
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bufp = buf;
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bufcnt--;
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return *bufp++ & 0x7f;
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}
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/* Read a packet from the remote machine, with error checking,
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and store it in BUF. Returns length of packet, or negative if error. */
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int
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getpkt (char *buf)
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{
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char *bp;
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unsigned char csum, c1, c2;
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int c;
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while (1)
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{
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csum = 0;
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while (1)
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{
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c = readchar ();
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if (c == '$')
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break;
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if (remote_debug)
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{
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fprintf (stderr, "[getpkt: discarding char '%c']\n", c);
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fflush (stderr);
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}
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if (c < 0)
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return -1;
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}
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bp = buf;
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while (1)
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{
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c = readchar ();
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if (c < 0)
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return -1;
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if (c == '#')
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break;
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*bp++ = c;
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csum += c;
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}
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*bp = 0;
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c1 = fromhex (readchar ());
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c2 = fromhex (readchar ());
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if (csum == (c1 << 4) + c2)
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break;
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fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
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(c1 << 4) + c2, csum, buf);
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write (remote_desc, "-", 1);
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}
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if (remote_debug)
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{
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fprintf (stderr, "getpkt (\"%s\"); [sending ack] \n", buf);
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fflush (stderr);
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}
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write (remote_desc, "+", 1);
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if (remote_debug)
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{
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fprintf (stderr, "[sent ack]\n");
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fflush (stderr);
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}
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return bp - buf;
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}
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void
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write_ok (char *buf)
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{
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buf[0] = 'O';
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buf[1] = 'K';
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buf[2] = '\0';
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}
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void
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write_enn (char *buf)
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{
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/* Some day, we should define the meanings of the error codes... */
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buf[0] = 'E';
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buf[1] = '0';
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buf[2] = '1';
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buf[3] = '\0';
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}
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void
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convert_int_to_ascii (char *from, char *to, int n)
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{
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int nib;
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char ch;
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while (n--)
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{
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ch = *from++;
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nib = ((ch & 0xf0) >> 4) & 0x0f;
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*to++ = tohex (nib);
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nib = ch & 0x0f;
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*to++ = tohex (nib);
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}
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*to++ = 0;
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}
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void
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convert_ascii_to_int (char *from, char *to, int n)
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{
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int nib1, nib2;
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while (n--)
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{
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nib1 = fromhex (*from++);
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nib2 = fromhex (*from++);
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*to++ = (((nib1 & 0x0f) << 4) & 0xf0) | (nib2 & 0x0f);
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}
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}
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static char *
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outreg (int regno, char *buf)
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{
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if ((regno >> 12) != 0)
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*buf++ = tohex ((regno >> 12) & 0xf);
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if ((regno >> 8) != 0)
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*buf++ = tohex ((regno >> 8) & 0xf);
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*buf++ = tohex ((regno >> 4) & 0xf);
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*buf++ = tohex (regno & 0xf);
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*buf++ = ':';
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collect_register_as_string (regno, buf);
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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 signo)
|
|
{
|
|
int nib, sig;
|
|
|
|
*buf++ = status;
|
|
|
|
sig = (int)target_signal_from_host (signo);
|
|
|
|
nib = ((sig & 0xf0) >> 4);
|
|
*buf++ = tohex (nib);
|
|
nib = sig & 0x0f;
|
|
*buf++ = tohex (nib);
|
|
|
|
if (status == 'T')
|
|
{
|
|
const char **regp = gdbserver_expedite_regs;
|
|
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)
|
|
{
|
|
/* FIXME right place to set this? */
|
|
thread_from_wait = ((struct inferior_list_entry *)current_inferior)->id;
|
|
if (debug_threads)
|
|
fprintf (stderr, "Writing resume reply for %d\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;", thread_from_wait);
|
|
buf += strlen (buf);
|
|
old_thread_from_wait = thread_from_wait;
|
|
}
|
|
}
|
|
}
|
|
/* 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,
|
|
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);
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
if (strncmp (own_buf, "qSymbol:", strlen ("qSymbol:")) != 0)
|
|
{
|
|
/* Malformed response. */
|
|
if (remote_debug)
|
|
{
|
|
fprintf (stderr, "Malformed response to qSymbol, ignoring.\n");
|
|
fflush (stderr);
|
|
}
|
|
|
|
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;
|
|
}
|