gdb/gdbserver/remote-utils.c

   1 /* Remote utility routines for the remote server for GDB.
   2    Copyright (C) 1986, 1989, 1993 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "server.h"
  21 #include "terminal.h"
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <sys/ioctl.h>
  25 #include <sys/file.h>
  26 #include <netinet/in.h>
  27 #include <sys/socket.h>
  28 #include <netdb.h>
  29 #include <netinet/tcp.h>
  30 #include <sys/ioctl.h>
  31 #include <signal.h>
  32 #include <fcntl.h>
  33
  34 int remote_debug = 1;
  35
  36 static int remote_desc;
  37
  38 /* Open a connection to a remote debugger.
  39    NAME is the filename used for communication.  */
  40
  41 void
  42 remote_open (name)
  43      char *name;
  44 {
  45   int save_fcntl_flags;
  46
  47   if (!strchr (name, ':'))
  48     {
  49       remote_desc = open (name, O_RDWR);
  50       if (remote_desc < 0)
  51         perror_with_name ("Could not open remote device");
  52
  53 #ifdef HAVE_TERMIOS
  54       {
  55         struct termios termios;
  56         tcgetattr(remote_desc, &termios);
  57
  58         termios.c_iflag = 0;
  59         termios.c_oflag = 0;
  60         termios.c_lflag = 0;
  61         termios.c_cflag &= ~(CSIZE|PARENB);
  62         termios.c_cflag |= CLOCAL | CS8;
  63         termios.c_cc[VMIN] = 0;
  64         termios.c_cc[VTIME] = 0;
  65
  66         tcsetattr(remote_desc, TCSANOW, &termios);
  67       }
  68 #endif
  69
  70 #ifdef HAVE_TERMIO
  71       {
  72         struct termio termio;
  73         ioctl (remote_desc, TCGETA, &termio);
  74
  75         termio.c_iflag = 0;
  76         termio.c_oflag = 0;
  77         termio.c_lflag = 0;
  78         termio.c_cflag &= ~(CSIZE|PARENB);
  79         termio.c_cflag |= CLOCAL | CS8;
  80         termio.c_cc[VMIN] = 0;
  81         termio.c_cc[VTIME] = 0;
  82
  83         ioctl (remote_desc, TCSETA, &termio);
  84       }
  85 #endif
  86
  87 #ifdef HAVE_SGTTY
  88       {
  89         struct sgttyb sg;
  90
  91         ioctl (remote_desc, TIOCGETP, &sg);
  92         sg.sg_flags = RAW;
  93         ioctl (remote_desc, TIOCSETP, &sg);
  94       }
  95 #endif
  96
  97
  98     }
  99   else
 100     {
 101       char *port_str;
 102       int port;
 103       struct sockaddr_in sockaddr;
 104       int tmp;
 105       struct protoent *protoent;
 106       int tmp_desc;
 107
 108       port_str = strchr (name, ':');
 109
 110       port = atoi (port_str + 1);
 111
 112       tmp_desc = socket (PF_INET, SOCK_STREAM, 0);
 113       if (tmp_desc < 0)
 114         perror_with_name ("Can't open socket");
 115
 116       /* Allow rapid reuse of this port. */
 117       tmp = 1;
 118       setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp,
 119                   sizeof(tmp));
 120
 121       sockaddr.sin_family = PF_INET;
 122       sockaddr.sin_port = htons(port);
 123       sockaddr.sin_addr.s_addr = INADDR_ANY;
 124
 125       if (bind (tmp_desc, (struct sockaddr *)&sockaddr, sizeof (sockaddr))
 126           || listen (tmp_desc, 1))
 127         perror_with_name ("Can't bind address");
 128
 129       tmp = sizeof (sockaddr);
 130       remote_desc = accept (tmp_desc, (struct sockaddr *)&sockaddr, &tmp);
 131       if (remote_desc == -1)
 132         perror_with_name ("Accept failed");
 133
 134       protoent = getprotobyname ("tcp");
 135       if (!protoent)
 136         perror_with_name ("getprotobyname");
 137
 138       /* Enable TCP keep alive process. */
 139       tmp = 1;
 140       setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp));
 141
 142       /* Tell TCP not to delay small packets.  This greatly speeds up
 143          interactive response. */
 144       tmp = 1;
 145       setsockopt (remote_desc, protoent->p_proto, TCP_NODELAY,
 146                   (char *)&tmp, sizeof(tmp));
 147
 148       close (tmp_desc);         /* No longer need this */
 149
 150       signal (SIGPIPE, SIG_IGN); /* If we don't do this, then gdbserver simply
 151                                     exits when the remote side dies.  */
 152     }
 153
 154 #if defined(F_SETFL) && defined (FASYNC)
 155   save_fcntl_flags = fcntl (remote_desc, F_GETFL, 0);
 156   fcntl (remote_desc, F_SETFL, save_fcntl_flags | FASYNC);
 157   disable_async_io ();
 158 #endif /* FASYNC */
 159   fprintf (stderr, "Remote debugging using %s\n", name);
 160 }
 161
 162 void
 163 remote_close()
 164 {
 165   close (remote_desc);
 166 }
 167
 168 /* Convert hex digit A to a number.  */
 169
 170 static int
 171 fromhex (a)
 172      int a;
 173 {
 174   if (a >= '0' && a <= '9')
 175     return a - '0';
 176   else if (a >= 'a' && a <= 'f')
 177     return a - 'a' + 10;
 178   else
 179     error ("Reply contains invalid hex digit");
 180 }
 181
 182 /* Convert number NIB to a hex digit.  */
 183
 184 static int
 185 tohex (nib)
 186      int nib;
 187 {
 188   if (nib < 10)
 189     return '0' + nib;
 190   else
 191     return 'a' + nib - 10;
 192 }
 193
 194 /* Send a packet to the remote machine, with error checking.
 195    The data of the packet is in BUF.  Returns >= 0 on success, -1 otherwise. */
 196
 197 int
 198 putpkt (buf)
 199      char *buf;
 200 {
 201   int i;
 202   unsigned char csum = 0;
 203   char buf2[2000];
 204   char buf3[1];
 205   int cnt = strlen (buf);
 206   char *p;
 207
 208   /* Copy the packet into buffer BUF2, encapsulating it
 209      and giving it a checksum.  */
 210
 211   p = buf2;
 212   *p++ = '$';
 213
 214   for (i = 0; i < cnt; i++)
 215     {
 216       csum += buf[i];
 217       *p++ = buf[i];
 218     }
 219   *p++ = '#';
 220   *p++ = tohex ((csum >> 4) & 0xf);
 221   *p++ = tohex (csum & 0xf);
 222
 223   *p = '\0';
 224
 225   /* Send it over and over until we get a positive ack.  */
 226
 227   do
 228     {
 229       int cc;
 230
 231       if (write (remote_desc, buf2, p - buf2) != p - buf2)
 232         {
 233           perror ("putpkt(write)");
 234           return -1;
 235         }
 236
 237       if (remote_debug)
 238         printf ("putpkt (\"%s\"); [looking for ack]\n", buf2);
 239       cc = read (remote_desc, buf3, 1);
 240       if (remote_debug)
 241         printf ("[received '%c' (0x%x)]\n", buf3[0], buf3[0]);
 242       if (cc <= 0)
 243         {
 244           if (cc == 0)
 245             fprintf (stderr, "putpkt(read): Got EOF\n");
 246           else
 247             perror ("putpkt(read)");
 248
 249           return -1;
 250         }
 251     }
 252   while (buf3[0] != '+');
 253
 254   return 1;                     /* Success! */
 255 }
 256
 257 /* Come here when we get an input interrupt from the remote side.  This
 258    interrupt should only be active while we are waiting for the child to do
 259    something.  About the only thing that should come through is a ^C, which
 260    will cause us to send a SIGINT to the child.  */
 261
 262 static void
 263 input_interrupt()
 264 {
 265   int cc;
 266   char c;
 267
 268   cc = read (remote_desc, &c, 1);
 269
 270   if (cc != 1 || c != '\003')
 271     {
 272       fprintf(stderr, "input_interrupt, cc = %d c = %d\n", cc, c);
 273       return;
 274     }
 275
 276   kill (inferior_pid, SIGINT);
 277 }
 278
 279 void
 280 enable_async_io()
 281 {
 282   signal (SIGIO, input_interrupt);
 283 }
 284
 285 void
 286 disable_async_io()
 287 {
 288   signal (SIGIO, SIG_IGN);
 289 }
 290
 291 /* Returns next char from remote GDB.  -1 if error.  */
 292
 293 static int
 294 readchar ()
 295 {
 296   static char buf[BUFSIZ];
 297   static int bufcnt = 0;
 298   static char *bufp;
 299
 300   if (bufcnt-- > 0)
 301     return *bufp++ & 0x7f;
 302
 303   bufcnt = read (remote_desc, buf, sizeof (buf));
 304
 305   if (bufcnt <= 0)
 306     {
 307       if (bufcnt == 0)
 308         fprintf (stderr, "readchar: Got EOF\n");
 309       else
 310         perror ("readchar");
 311
 312       return -1;
 313     }
 314
 315   bufp = buf;
 316   bufcnt--;
 317   return *bufp++ & 0x7f;
 318 }
 319
 320 /* Read a packet from the remote machine, with error checking,
 321    and store it in BUF.  Returns length of packet, or negative if error. */
 322
 323 int
 324 getpkt (buf)
 325      char *buf;
 326 {
 327   char *bp;
 328   unsigned char csum, c1, c2;
 329   int c;
 330
 331   while (1)
 332     {
 333       csum = 0;
 334
 335       while (1)
 336         {
 337           c = readchar ();
 338           if (c == '$')
 339             break;
 340           if (remote_debug)
 341             printf ("[getpkt: discarding char '%c']\n", c);
 342           if (c < 0)
 343             return -1;
 344         }
 345
 346       bp = buf;
 347       while (1)
 348         {
 349           c = readchar ();
 350           if (c < 0)
 351             return -1;
 352           if (c == '#')
 353             break;
 354           *bp++ = c;
 355           csum += c;
 356         }
 357       *bp = 0;
 358
 359       c1 = fromhex (readchar ());
 360       c2 = fromhex (readchar ());
 361
 362       if (csum == (c1 << 4) + c2)
 363         break;
 364
 365       fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
 366                (c1 << 4) + c2, csum, buf);
 367       write (remote_desc, "-", 1);
 368     }
 369
 370   if (remote_debug)
 371     printf ("getpkt (\"%s\");  [sending ack] \n", buf);
 372
 373   write (remote_desc, "+", 1);
 374
 375   if (remote_debug)
 376     printf ("[sent ack]\n");
 377   return bp - buf;
 378 }
 379
 380 void
 381 write_ok (buf)
 382      char *buf;
 383 {
 384   buf[0] = 'O';
 385   buf[1] = 'K';
 386   buf[2] = '\0';
 387 }
 388
 389 void
 390 write_enn (buf)
 391      char *buf;
 392 {
 393   buf[0] = 'E';
 394   buf[1] = 'N';
 395   buf[2] = 'N';
 396   buf[3] = '\0';
 397 }
 398
 399 void
 400 convert_int_to_ascii (from, to, n)
 401      char *from, *to;
 402      int n;
 403 {
 404   int nib;
 405   char ch;
 406   while (n--)
 407     {
 408       ch = *from++;
 409       nib = ((ch & 0xf0) >> 4) & 0x0f;
 410       *to++ = tohex (nib);
 411       nib = ch & 0x0f;
 412       *to++ = tohex (nib);
 413     }
 414   *to++ = 0;
 415 }
 416
 417
 418 void
 419 convert_ascii_to_int (from, to, n)
 420      char *from, *to;
 421      int n;
 422 {
 423   int nib1, nib2;
 424   while (n--)
 425     {
 426       nib1 = fromhex (*from++);
 427       nib2 = fromhex (*from++);
 428       *to++ = (((nib1 & 0x0f) << 4) & 0xf0) | (nib2 & 0x0f);
 429     }
 430 }
 431
 432 static char *
 433 outreg(regno, buf)
 434      int regno;
 435      char *buf;
 436 {
 437   extern char registers[];
 438   int regsize = REGISTER_RAW_SIZE (regno);
 439
 440   *buf++ = tohex (regno >> 4);
 441   *buf++ = tohex (regno & 0xf);
 442   *buf++ = ':';
 443   convert_int_to_ascii (&registers[REGISTER_BYTE (regno)], buf, regsize);
 444   buf += 2 * regsize;
 445   *buf++ = ';';
 446
 447   return buf;
 448 }
 449
 450 void
 451 prepare_resume_reply (buf, status, signo)
 452      char *buf;
 453      char status;
 454      unsigned char signo;
 455 {
 456   int nib;
 457
 458   *buf++ = status;
 459
 460   /* FIXME!  Should be converting this signal number (numbered
 461      according to the signal numbering of the system we are running on)
 462      to the signal numbers used by the gdb protocol (see enum target_signal
 463      in gdb/target.h).  */
 464   nib = ((signo & 0xf0) >> 4);
 465   *buf++ = tohex (nib);
 466   nib = signo & 0x0f;
 467   *buf++ = tohex (nib);
 468
 469   if (status == 'T')
 470     {
 471       buf = outreg (PC_REGNUM, buf);
 472       buf = outreg (FP_REGNUM, buf);
 473       buf = outreg (SP_REGNUM, buf);
 474 #ifdef NPC_REGNUM
 475       buf = outreg (NPC_REGNUM, buf);
 476 #endif
 477 #ifdef O7_REGNUM
 478       buf = outreg (O7_REGNUM, buf);
 479 #endif
 480
 481       /* If the debugger hasn't used any thread features, don't burden it with
 482          threads.  If we didn't check this, GDB 4.13 and older would choke.  */
 483       if (cont_thread != 0)
 484         {
 485           if (old_thread_from_wait != thread_from_wait)
 486             {
 487               sprintf (buf, "thread:%x;", thread_from_wait);
 488               buf += strlen (buf);
 489               old_thread_from_wait = thread_from_wait;
 490             }
 491         }
 492     }
 493   /* For W and X, we're done.  */
 494   *buf++ = 0;
 495 }
 496
 497 void
 498 decode_m_packet (from, mem_addr_ptr, len_ptr)
 499      char *from;
 500      CORE_ADDR *mem_addr_ptr;
 501      unsigned int *len_ptr;
 502 {
 503   int i = 0, j = 0;
 504   char ch;
 505   *mem_addr_ptr = *len_ptr = 0;
 506
 507   while ((ch = from[i++]) != ',')
 508     {
 509       *mem_addr_ptr = *mem_addr_ptr << 4;
 510       *mem_addr_ptr |= fromhex (ch) & 0x0f;
 511     }
 512
 513   for (j = 0; j < 4; j++)
 514     {
 515       if ((ch = from[i++]) == 0)
 516         break;
 517       *len_ptr = *len_ptr << 4;
 518       *len_ptr |= fromhex (ch) & 0x0f;
 519     }
 520 }
 521
 522 void
 523 decode_M_packet (from, mem_addr_ptr, len_ptr, to)
 524      char *from, *to;
 525      CORE_ADDR *mem_addr_ptr;
 526      unsigned int *len_ptr;
 527 {
 528   int i = 0;
 529   char ch;
 530   *mem_addr_ptr = *len_ptr = 0;
 531
 532   while ((ch = from[i++]) != ',')
 533     {
 534       *mem_addr_ptr = *mem_addr_ptr << 4;
 535       *mem_addr_ptr |= fromhex (ch) & 0x0f;
 536     }
 537
 538   while ((ch = from[i++]) != ':')
 539     {
 540       *len_ptr = *len_ptr << 4;
 541       *len_ptr |= fromhex (ch) & 0x0f;
 542     }
 543
 544   convert_ascii_to_int (&from[i++], to, *len_ptr);
 545 }