558 lines
12 KiB
C
558 lines
12 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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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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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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/* 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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}
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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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struct protoent *protoent;
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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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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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protoent = getprotobyname ("tcp");
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if (!protoent)
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perror_with_name ("getprotobyname");
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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, protoent->p_proto, 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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}
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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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fprintf (stderr, "Remote debugging using %s\n", name);
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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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}
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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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/* 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[PBUFSIZ];
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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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/* 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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printf ("putpkt (\"%s\"); [looking for ack]\n", buf2);
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cc = read (remote_desc, buf3, 1);
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if (remote_debug)
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printf ("[received '%c' (0x%x)]\n", buf3[0], buf3[0]);
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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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return -1;
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}
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}
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while (buf3[0] != '+');
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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 (void)
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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;
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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, cc = %d c = %d\n", cc, c);
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return;
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}
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kill (inferior_pid, SIGINT);
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}
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}
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void
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enable_async_io (void)
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{
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signal (SIGIO, input_interrupt);
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}
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void
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disable_async_io (void)
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{
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signal (SIGIO, SIG_IGN);
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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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printf ("[getpkt: discarding char '%c']\n", c);
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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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printf ("getpkt (\"%s\"); [sending ack] \n", buf);
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write (remote_desc, "+", 1);
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if (remote_debug)
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printf ("[sent ack]\n");
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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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buf[0] = 'E';
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buf[1] = 'N';
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buf[2] = 'N';
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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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int regsize = REGISTER_RAW_SIZE (regno);
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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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convert_int_to_ascii (®isters[REGISTER_BYTE (regno)], buf, regsize);
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buf += 2 * regsize;
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*buf++ = ';';
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return buf;
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}
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void
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prepare_resume_reply (char *buf, char status, unsigned char signo)
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{
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int nib;
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*buf++ = status;
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/* FIXME! Should be converting this signal number (numbered
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according to the signal numbering of the system we are running on)
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to the signal numbers used by the gdb protocol (see enum target_signal
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in gdb/target.h). */
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nib = ((signo & 0xf0) >> 4);
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*buf++ = tohex (nib);
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nib = signo & 0x0f;
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*buf++ = tohex (nib);
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if (status == 'T')
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{
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#ifdef GDBSERVER_RESUME_REGS
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static int gdbserver_resume_regs[] = GDBSERVER_RESUME_REGS ;
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int i;
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for (i = 0;
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i < sizeof (gdbserver_resume_regs)
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/ sizeof (gdbserver_resume_regs[0]);
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i++)
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{
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int regnum = gdbserver_resume_regs[i];
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buf = outreg (regnum, buf);
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}
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#else /* !defined(GDBSERVER_RESUME_REGS) */
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buf = outreg (PC_REGNUM, buf);
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buf = outreg (FP_REGNUM, buf);
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buf = outreg (SP_REGNUM, buf);
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if (NPC_REGNUM >= 0)
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buf = outreg (NPC_REGNUM, buf);
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#ifdef O7_REGNUM
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buf = outreg (O7_REGNUM, buf);
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#endif
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#endif /* GDBSERVER_RESUME_REGS */
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/* If the debugger hasn't used any thread features, don't burden it with
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threads. If we didn't check this, GDB 4.13 and older would choke. */
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if (cont_thread != 0)
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{
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if (old_thread_from_wait != thread_from_wait)
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{
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sprintf (buf, "thread:%x;", thread_from_wait);
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buf += strlen (buf);
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old_thread_from_wait = thread_from_wait;
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}
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}
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}
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/* For W and X, we're done. */
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*buf++ = 0;
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}
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void
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decode_m_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr)
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{
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int i = 0, j = 0;
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char ch;
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*mem_addr_ptr = *len_ptr = 0;
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while ((ch = from[i++]) != ',')
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{
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*mem_addr_ptr = *mem_addr_ptr << 4;
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*mem_addr_ptr |= fromhex (ch) & 0x0f;
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}
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for (j = 0; j < 4; j++)
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{
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if ((ch = from[i++]) == 0)
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break;
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*len_ptr = *len_ptr << 4;
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*len_ptr |= fromhex (ch) & 0x0f;
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}
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}
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void
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decode_M_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr,
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char *to)
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{
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int i = 0;
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char ch;
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*mem_addr_ptr = *len_ptr = 0;
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while ((ch = from[i++]) != ',')
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{
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*mem_addr_ptr = *mem_addr_ptr << 4;
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*mem_addr_ptr |= fromhex (ch) & 0x0f;
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}
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while ((ch = from[i++]) != ':')
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{
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*len_ptr = *len_ptr << 4;
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*len_ptr |= fromhex (ch) & 0x0f;
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}
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convert_ascii_to_int (&from[i++], to, *len_ptr);
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}
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