gdb/sparcl-tdep.c

   1 /* Target dependent code for the Fujitsu SPARClite for GDB, the GNU debugger.
   2    Copyright 1994, 1995, 1996  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 "defs.h"
  21 #include "gdbcore.h"
  22 #include "breakpoint.h"
  23 #include "target.h"
  24 #include "serial.h"
  25 #include <sys/types.h>
  26 #include <sys/time.h>
  27
  28 #if defined(__GO32__) || defined(WIN32)
  29 #undef HAVE_SOCKETS
  30 #else
  31 #define HAVE_SOCKETS
  32 #endif
  33
  34
  35 #ifdef HAVE_SOCKETS
  36 #include <unistd.h>
  37 #include <sys/socket.h>
  38 #include <netinet/in.h>
  39 #include <netdb.h>
  40 #endif
  41
  42 extern struct target_ops sparclite_ops; /* Forward decl */
  43 extern struct target_ops remote_ops;
  44
  45 static char *remote_target_name = NULL;
  46 static serial_t remote_desc = NULL;
  47 static int serial_flag;
  48 #ifdef HAVE_SOCKETS
  49 static int udp_fd = -1;
  50 #endif
  51
  52 static serial_t open_tty PARAMS ((char *name));
  53 static int send_resp PARAMS ((serial_t desc, char c));
  54 static void close_tty PARAMS ((int ignore));
  55 #ifdef HAVE_SOCKETS
  56 static int recv_udp_buf PARAMS ((int fd, unsigned char *buf, int len, int timeout));
  57 static int send_udp_buf PARAMS ((int fd, unsigned char *buf, int len));
  58 #endif
  59 static void sparclite_open PARAMS ((char *name, int from_tty));
  60 static void sparclite_close PARAMS ((int quitting));
  61 static void download PARAMS ((char *target_name, char *args, int from_tty,
  62                               void (*write_routine) (bfd *from_bfd,
  63                                                      asection *from_sec,
  64                                                      file_ptr from_addr,
  65                                                      bfd_vma to_addr, int len),
  66                               void (*start_routine) (bfd_vma entry)));
  67 static void sparclite_serial_start PARAMS ((bfd_vma entry));
  68 static void sparclite_serial_write PARAMS ((bfd *from_bfd, asection *from_sec,
  69                                             file_ptr from_addr,
  70                                             bfd_vma to_addr, int len));
  71 #ifdef HAVE_SOCKETS
  72 static unsigned short calc_checksum PARAMS ((unsigned char *buffer,
  73                                              int count));
  74 static void sparclite_udp_start PARAMS ((bfd_vma entry));
  75 static void sparclite_udp_write PARAMS ((bfd *from_bfd, asection *from_sec,
  76                                          file_ptr from_addr, bfd_vma to_addr,
  77                                          int len));
  78 #endif
  79 static void sparclite_download PARAMS ((char *filename, int from_tty));
  80
  81 #define DDA2_SUP_ASI            0xb000000
  82 #define DDA1_SUP_ASI            0xb0000
  83
  84 #define DDA2_ASI_MASK           0xff000000
  85 #define DDA1_ASI_MASK           0xff0000
  86 #define DIA2_SUP_MODE           0x8000
  87 #define DIA1_SUP_MODE           0x4000
  88 #define DDA2_ENABLE             0x100
  89 #define DDA1_ENABLE             0x80
  90 #define DIA2_ENABLE             0x40
  91 #define DIA1_ENABLE             0x20
  92 #define DSINGLE_STEP            0x10
  93 #define DDV_TYPE_MASK           0xc
  94 #define DDV_TYPE_LOAD           0x0
  95 #define DDV_TYPE_STORE          0x4
  96 #define DDV_TYPE_ACCESS         0x8
  97 #define DDV_TYPE_ALWAYS         0xc
  98 #define DDV_COND                0x2
  99 #define DDV_MASK                0x1
 100
 101 int
 102 sparclite_insert_watchpoint (addr, len, type)
 103      CORE_ADDR addr;
 104      int len;
 105      int type;
 106 {
 107   CORE_ADDR dcr;
 108
 109   dcr = read_register (DCR_REGNUM);
 110
 111   if (!(dcr & DDA1_ENABLE))
 112     {
 113       write_register (DDA1_REGNUM, addr);
 114       dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK);
 115       dcr |= (DDA1_SUP_ASI | DDA1_ENABLE);
 116       if (type == 1)
 117         {
 118           write_register (DDV1_REGNUM, 0);
 119           write_register (DDV2_REGNUM, 0xffffffff);
 120           dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK));
 121         }
 122       else if (type == 0)
 123         {
 124           write_register (DDV1_REGNUM, 0);
 125           write_register (DDV2_REGNUM, 0xffffffff);
 126           dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK));
 127         }
 128       else
 129         {
 130           write_register (DDV1_REGNUM, 0);
 131           write_register (DDV2_REGNUM, 0xffffffff);
 132           dcr |= (DDV_TYPE_ACCESS);
 133         }
 134       write_register (DCR_REGNUM, dcr);
 135     }
 136   else if (!(dcr & DDA2_ENABLE))
 137     {
 138       write_register (DDA2_REGNUM, addr);
 139       dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK);
 140       dcr |= (DDA2_SUP_ASI | DDA2_ENABLE);
 141       if (type == 1)
 142         {
 143           write_register (DDV1_REGNUM, 0);
 144           write_register (DDV2_REGNUM, 0xffffffff);
 145           dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK);
 146         }
 147       else if (type == 0)
 148         {
 149           write_register (DDV1_REGNUM, 0);
 150           write_register (DDV2_REGNUM, 0xffffffff);
 151           dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK);
 152         }
 153       else
 154         {
 155           write_register (DDV1_REGNUM, 0);
 156           write_register (DDV2_REGNUM, 0xffffffff);
 157           dcr |= (DDV_TYPE_ACCESS);
 158         }
 159       write_register (DCR_REGNUM, dcr);
 160     }
 161   else
 162     return -1;
 163
 164   return 0;
 165 }
 166
 167 int
 168 sparclite_remove_watchpoint (addr, len, type)
 169      CORE_ADDR addr;
 170      int len;
 171      int type;
 172 {
 173   CORE_ADDR dcr, dda1, dda2;
 174
 175   dcr = read_register (DCR_REGNUM);
 176   dda1 = read_register (DDA1_REGNUM);
 177   dda2 = read_register (DDA2_REGNUM);
 178
 179   if ((dcr & DDA1_ENABLE) && addr == dda1)
 180     write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE));
 181   else if ((dcr & DDA2_ENABLE) && addr == dda2)
 182     write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE));
 183   else
 184     return -1;
 185
 186   return 0;
 187 }
 188
 189 int
 190 sparclite_insert_hw_breakpoint (addr, len)
 191      CORE_ADDR addr;
 192      int len;
 193 {
 194   CORE_ADDR dcr;
 195
 196   dcr = read_register (DCR_REGNUM);
 197
 198   if (!(dcr & DIA1_ENABLE))
 199     {
 200       write_register (DIA1_REGNUM, addr);
 201       write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE));
 202     }
 203   else if (!(dcr & DIA2_ENABLE))
 204     {
 205       write_register (DIA2_REGNUM, addr);
 206       write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE));
 207     }
 208   else
 209     return -1;
 210
 211   return 0;
 212 }
 213
 214 int
 215 sparclite_remove_hw_breakpoint (addr, shadow)
 216      CORE_ADDR addr;
 217      int shadow;
 218 {
 219   CORE_ADDR dcr, dia1, dia2;
 220
 221   dcr = read_register (DCR_REGNUM);
 222   dia1 = read_register (DIA1_REGNUM);
 223   dia2 = read_register (DIA2_REGNUM);
 224
 225   if ((dcr & DIA1_ENABLE) && addr == dia1)
 226     write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE));
 227   else if ((dcr & DIA2_ENABLE) && addr == dia2)
 228     write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE));
 229   else
 230     return -1;
 231
 232   return 0;
 233 }
 234
 235 int
 236 sparclite_check_watch_resources (type, cnt, ot)
 237      int type;
 238      int cnt;
 239      int ot;
 240 {
 241   if (type == bp_hardware_breakpoint)
 242     {
 243       if (TARGET_HW_BREAK_LIMIT == 0)
 244         return 0;
 245       else if (cnt <= TARGET_HW_BREAK_LIMIT)
 246         return 1;
 247     }
 248   else
 249     {
 250       if (TARGET_HW_WATCH_LIMIT == 0)
 251         return 0;
 252       else if (ot)
 253         return -1;
 254       else if (cnt <= TARGET_HW_WATCH_LIMIT)
 255         return 1;
 256     }
 257   return -1;
 258 }
 259
 260 CORE_ADDR
 261 sparclite_stopped_data_address ()
 262 {
 263   CORE_ADDR dsr, dda1, dda2;
 264
 265   dsr = read_register (DSR_REGNUM);
 266   dda1 = read_register (DDA1_REGNUM);
 267   dda2 = read_register (DDA2_REGNUM);
 268
 269   if (dsr & 0x10)
 270     return dda1;
 271   else if (dsr & 0x20)
 272     return dda2;
 273   else
 274     return 0;
 275 }
 276 \f
 277 static serial_t
 278 open_tty (name)
 279      char *name;
 280 {
 281   serial_t desc;
 282
 283   desc = SERIAL_OPEN (name);
 284   if (!desc)
 285     perror_with_name (name);
 286
 287   if (baud_rate != -1)
 288     {
 289       if (SERIAL_SETBAUDRATE (desc, baud_rate))
 290         {
 291           SERIAL_CLOSE (desc);
 292           perror_with_name (name);
 293         }
 294     }
 295
 296   SERIAL_RAW (desc);
 297
 298   SERIAL_FLUSH_INPUT (desc);
 299
 300   return desc;
 301 }
 302
 303 /* Read a single character from the remote end, masking it down to 7 bits. */
 304
 305 static int
 306 readchar (desc, timeout)
 307      serial_t desc;
 308      int timeout;
 309 {
 310   int ch;
 311
 312   ch = SERIAL_READCHAR (desc, timeout);
 313
 314   switch (ch)
 315     {
 316     case SERIAL_EOF:
 317       error ("SPARClite remote connection closed");
 318     case SERIAL_ERROR:
 319       perror_with_name ("SPARClite communication error");
 320     case SERIAL_TIMEOUT:
 321       error ("SPARClite remote timeout");
 322     default:
 323       return ch;
 324     }
 325 }
 326
 327 static int
 328 send_resp (desc, c)
 329      serial_t desc;
 330      char c;
 331 {
 332   SERIAL_WRITE (desc, &c, 1);
 333   return readchar (desc, 2);
 334 }
 335
 336 static void
 337 close_tty (ignore)
 338      int ignore;
 339 {
 340   if (!remote_desc)
 341     return;
 342
 343   SERIAL_CLOSE (remote_desc);
 344
 345   remote_desc = NULL;
 346 }
 347
 348 #ifdef HAVE_SOCKETS
 349 static int
 350 recv_udp_buf (fd, buf, len, timeout)
 351      int fd, len;
 352      unsigned char *buf;
 353      int timeout;
 354 {
 355   int cc;
 356   fd_set readfds;
 357
 358   FD_ZERO (&readfds);
 359   FD_SET (fd, &readfds);
 360
 361   if (timeout >= 0)
 362     {
 363       struct timeval timebuf;
 364
 365       timebuf.tv_sec = timeout;
 366       timebuf.tv_usec = 0;
 367       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 368     }
 369   else
 370     cc = select (fd + 1, &readfds, 0, 0, 0);
 371
 372   if (cc == 0)
 373     return 0;
 374
 375   if (cc != 1)
 376     perror_with_name ("recv_udp_buf: Bad return value from select:");
 377
 378   cc = recv (fd, buf, len, 0);
 379
 380   if (cc < 0)
 381     perror_with_name ("Got an error from recv: ");
 382 }
 383
 384 static int
 385 send_udp_buf (fd, buf, len)
 386      int fd, len;
 387      unsigned char *buf;
 388 {
 389   int cc;
 390
 391   cc = send (fd, buf, len, 0);
 392
 393   if (cc == len)
 394     return;
 395
 396   if (cc < 0)
 397     perror_with_name ("Got an error from send: ");
 398
 399   error ("Short count in send: tried %d, sent %d\n", len, cc);
 400 }
 401 #endif /* __GO32__ */
 402
 403 static void
 404 sparclite_open (name, from_tty)
 405      char *name;
 406      int from_tty;
 407 {
 408   struct cleanup *old_chain;
 409   int c;
 410   char *p;
 411
 412   if (!name)
 413     error ("You need to specify what device or hostname is associated with the SparcLite board.");
 414
 415   target_preopen (from_tty);
 416
 417   unpush_target (&sparclite_ops);
 418
 419   if (remote_target_name)
 420     free (remote_target_name);
 421
 422   remote_target_name = strsave (name);
 423
 424   /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
 425      mean either a serial port on a terminal server, or the IP address of a
 426      SPARClite demo board.  If there's no colon, then it pretty much has to be
 427      a local device (except for DOS... grrmble) */
 428
 429   p = strchr (name, ' ');
 430
 431   if (p)
 432     {
 433       *p++ = '\000';
 434       while ((*p != '\000') && isspace (*p)) p++;
 435
 436       if (strncmp (name, "serial", strlen (name)) == 0)
 437         serial_flag = 1;
 438       else if (strncmp (name, "udp", strlen (name)) == 0)
 439         serial_flag = 0;
 440       else
 441         error ("Must specify either `serial' or `udp'.");
 442     }
 443   else
 444     {
 445       p = name;
 446
 447       if (!strchr (name, ':'))
 448         serial_flag = 1;        /* No colon is unambiguous (local device) */
 449       else
 450         error ("Usage: target sparclite serial /dev/ttyb\n\
 451 or: target sparclite udp host");
 452     }
 453
 454   if (serial_flag)
 455     {
 456       remote_desc = open_tty (p);
 457
 458       old_chain = make_cleanup (close_tty, 0);
 459
 460       c = send_resp (remote_desc, 0x00);
 461
 462       if (c != 0xaa)
 463         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 464                c);
 465
 466       c = send_resp (remote_desc, 0x55);
 467
 468       if (c != 0x55)
 469         error ("Sparclite appears to be ill.");
 470     }
 471   else
 472     {
 473 #ifdef HAVE_SOCKETS
 474       struct hostent *he;
 475       struct sockaddr_in sockaddr;
 476       unsigned char buffer[100];
 477       int cc;
 478
 479       /* Setup the socket.  Must be raw UDP. */
 480
 481       he = gethostbyname (p);
 482
 483       if (!he)
 484         error ("No such host %s.", p);
 485
 486       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 487
 488       old_chain = make_cleanup (close, udp_fd);
 489
 490       sockaddr.sin_family = PF_INET;
 491       sockaddr.sin_port = htons(7000);
 492       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 493
 494       if (connect (udp_fd, &sockaddr, sizeof(sockaddr)))
 495         perror_with_name ("Connect failed");
 496
 497       buffer[0] = 0x5;
 498       buffer[1] = 0;
 499
 500       send_udp_buf (udp_fd, buffer, 2); /* Request version */
 501       cc = recv_udp_buf (udp_fd, buffer, sizeof(buffer), 5); /* Get response */
 502       if (cc == 0)
 503         error ("SPARClite isn't responding.");
 504
 505       if (cc < 3)
 506         error ("SPARClite appears to be ill.");
 507 #else
 508       error ("UDP downloading is not supported for DOS hosts.");
 509 #endif /* __GO32__ */
 510     }
 511
 512   printf_unfiltered ("[SPARClite appears to be alive]\n");
 513
 514   push_target (&sparclite_ops);
 515
 516   discard_cleanups (old_chain);
 517
 518   return;
 519 }
 520
 521 static void
 522 sparclite_close (quitting)
 523      int quitting;
 524 {
 525   if (serial_flag)
 526     close_tty (0);
 527 #ifdef HAVE_SOCKETS
 528   else
 529     if (udp_fd != -1)
 530       close (udp_fd);
 531 #endif
 532 }
 533
 534 #define LOAD_ADDRESS 0x40000000
 535
 536 static void
 537 download (target_name, args, from_tty, write_routine, start_routine)
 538      char *target_name;
 539      char *args;
 540      int from_tty;
 541      void (*write_routine)();
 542      void (*start_routine)();
 543 {
 544   struct cleanup *old_chain;
 545   asection *section;
 546   bfd *pbfd;
 547   bfd_vma entry;
 548   int i;
 549 #define WRITESIZE 1024
 550   char *filename;
 551   int quiet;
 552   int nostart;
 553
 554   quiet = 0;
 555   nostart = 0;
 556   filename = NULL;
 557
 558   while (*args != '\000')
 559     {
 560       char *arg;
 561
 562       while (isspace (*args)) args++;
 563
 564       arg = args;
 565
 566       while ((*args != '\000') && !isspace (*args)) args++;
 567
 568       if (*args != '\000')
 569         *args++ = '\000';
 570
 571       if (*arg != '-')
 572         filename = arg;
 573       else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
 574         quiet = 1;
 575       else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
 576         nostart = 1;
 577       else
 578         error ("unknown option `%s'", arg);
 579     }
 580
 581   if (!filename)
 582     filename = get_exec_file (1);
 583
 584   pbfd = bfd_openr (filename, gnutarget);
 585   if (pbfd == NULL)
 586     {
 587       perror_with_name (filename);
 588       return;
 589     }
 590   old_chain = make_cleanup (bfd_close, pbfd);
 591
 592   if (!bfd_check_format (pbfd, bfd_object))
 593     error ("\"%s\" is not an object file: %s", filename,
 594            bfd_errmsg (bfd_get_error ()));
 595
 596   for (section = pbfd->sections; section; section = section->next)
 597     {
 598       if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
 599         {
 600           bfd_vma section_address;
 601           bfd_size_type section_size;
 602           file_ptr fptr;
 603
 604           section_address = bfd_get_section_vma (pbfd, section);
 605           /* Adjust sections from a.out files, since they don't
 606              carry their addresses with.  */
 607           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 608             section_address += LOAD_ADDRESS;
 609
 610           section_size = bfd_get_section_size_before_reloc (section);
 611
 612           if (!quiet)
 613             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 614                              bfd_get_section_name (pbfd, section),
 615                              section_address,
 616                              section_size);
 617
 618           fptr = 0;
 619           while (section_size > 0)
 620             {
 621               int count;
 622               static char inds[] = "|/-\\";
 623               static int k = 0;
 624
 625               QUIT;
 626
 627               count = min (section_size, WRITESIZE);
 628
 629               write_routine (pbfd, section, fptr, section_address, count);
 630
 631               if (!quiet)
 632                 {
 633                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 634                   gdb_flush (gdb_stdout);
 635                 }
 636
 637               section_address += count;
 638               fptr += count;
 639               section_size -= count;
 640             }
 641         }
 642     }
 643
 644   if (!nostart)
 645     {
 646       entry = bfd_get_start_address (pbfd);
 647
 648       if (!quiet)
 649         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 650
 651       start_routine (entry);
 652     }
 653
 654   do_cleanups (old_chain);
 655 }
 656
 657 static void
 658 sparclite_serial_start (entry)
 659      bfd_vma entry;
 660 {
 661   char buffer[5];
 662   int i;
 663
 664   buffer[0] = 0x03;
 665   store_unsigned_integer (buffer + 1, 4, entry);
 666
 667   SERIAL_WRITE (remote_desc, buffer, 1 + 4);
 668   i = readchar (remote_desc, 2);
 669   if (i != 0x55)
 670     error ("Can't start SparcLite.  Error code %d\n", i);
 671 }
 672
 673 static void
 674 sparclite_serial_write (from_bfd, from_sec, from_addr, to_addr, len)
 675      bfd *from_bfd;
 676      asection *from_sec;
 677      file_ptr from_addr;
 678      bfd_vma to_addr;
 679      int len;
 680 {
 681   char buffer[4 + 4 + WRITESIZE]; /* addr + len + data */
 682   unsigned char checksum;
 683   int i;
 684
 685   store_unsigned_integer (buffer, 4, to_addr); /* Address */
 686   store_unsigned_integer (buffer + 4, 4, len); /* Length */
 687
 688   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 689
 690   checksum = 0;
 691   for (i = 0; i < len; i++)
 692     checksum += buffer[8 + i];
 693
 694   i = send_resp (remote_desc, 0x01);
 695
 696   if (i != 0x5a)
 697     error ("Bad response from load command (0x%x)", i);
 698
 699   SERIAL_WRITE (remote_desc, buffer, 4 + 4 + len);
 700   i = readchar (remote_desc, 2);
 701
 702   if (i != checksum)
 703     error ("Bad checksum from load command (0x%x)", i);
 704 }
 705
 706 #ifdef HAVE_SOCKETS
 707
 708 static unsigned short
 709 calc_checksum (buffer, count)
 710      unsigned char *buffer;
 711      int count;
 712 {
 713   unsigned short checksum;
 714
 715   checksum = 0;
 716   for (; count > 0; count -= 2, buffer += 2)
 717     checksum += (*buffer << 8) | *(buffer + 1);
 718
 719   if (count != 0)
 720     checksum += *buffer << 8;
 721
 722   return checksum;
 723 }
 724
 725 static void
 726 sparclite_udp_start (entry)
 727      bfd_vma entry;
 728 {
 729   unsigned char buffer[6];
 730   int i;
 731
 732   buffer[0] = 0x3;
 733   buffer[1] = 0;
 734   buffer[2] = entry >> 24;
 735   buffer[3] = entry >> 16;
 736   buffer[4] = entry >> 8;
 737   buffer[5] = entry;
 738
 739   send_udp_buf (udp_fd, buffer, 6); /* Send start addr */
 740   i = recv_udp_buf (udp_fd, buffer, sizeof(buffer), -1); /* Get response */
 741
 742   if (i < 1 || buffer[0] != 0x55)
 743     error ("Failed to take start address.");
 744 }
 745
 746 static void
 747 sparclite_udp_write (from_bfd, from_sec, from_addr, to_addr, len)
 748      bfd *from_bfd;
 749      asection *from_sec;
 750      file_ptr from_addr;
 751      bfd_vma to_addr;
 752      int len;
 753 {
 754   unsigned char buffer[2000];
 755   unsigned short checksum;
 756   static int pkt_num = 0;
 757   static unsigned long old_addr = -1;
 758   int i;
 759
 760   while (1)
 761     {
 762       if (to_addr != old_addr)
 763         {
 764           buffer[0] = 0x1;      /* Load command */
 765           buffer[1] = 0x1;      /* Loading address */
 766           buffer[2] = to_addr >> 24;
 767           buffer[3] = to_addr >> 16;
 768           buffer[4] = to_addr >> 8;
 769           buffer[5] = to_addr;
 770
 771           checksum = 0;
 772           for (i = 0; i < 6; i++)
 773             checksum += buffer[i];
 774           checksum &= 0xff;
 775
 776           send_udp_buf (udp_fd, buffer, 6);
 777           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 778
 779           if (i < 1)
 780             error ("Got back short checksum for load addr.");
 781
 782           if (checksum != buffer[0])
 783             error ("Got back bad checksum for load addr.");
 784
 785           pkt_num = 0;          /* Load addr resets packet seq # */
 786           old_addr = to_addr;
 787         }
 788
 789       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 790                                 len);
 791
 792       checksum = calc_checksum (buffer + 6, len);
 793
 794       buffer[0] = 0x1;          /* Load command */
 795       buffer[1] = 0x2;          /* Loading data */
 796       buffer[2] = pkt_num >> 8;
 797       buffer[3] = pkt_num;
 798       buffer[4] = checksum >> 8;
 799       buffer[5] = checksum;
 800
 801       send_udp_buf (udp_fd, buffer, len + 6);
 802       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 803
 804       if (i == 0)
 805         {
 806           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 807           continue;
 808         }
 809
 810       if (buffer[0] != 0xff)
 811         error ("Got back bad response for load data.");
 812
 813       old_addr += len;
 814       pkt_num++;
 815
 816       return;
 817     }
 818 }
 819
 820 #endif /* __GO32__ */
 821
 822 static void
 823 sparclite_download (filename, from_tty)
 824      char *filename;
 825      int from_tty;
 826 {
 827   if (!serial_flag)
 828 #ifdef HAVE_SOCKETS
 829     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 830               sparclite_udp_start);
 831 #else
 832     abort ();                   /* sparclite_open should prevent this! */
 833 #endif
 834   else
 835     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 836               sparclite_serial_start);
 837 }
 838 \f
 839 /* Define the target subroutine names */
 840
 841 static struct target_ops sparclite_ops =
 842 {
 843   "sparclite",                  /* to_shortname */
 844   "SPARClite remote target",    /* to_longname */
 845   "Use a remote SPARClite target board via a serial line, using a gdb-specific protocol.\n\
 846 Specify the serial device it is connected to (e.g. /dev/ttya).",  /* to_doc */
 847   sparclite_open,               /* to_open */
 848   sparclite_close,              /* to_close */
 849   0,                            /* to_attach */
 850   0,                            /* to_detach */
 851   0,                            /* to_resume */
 852   0,                            /* to_wait */
 853   0,                            /* to_fetch_registers */
 854   0,                            /* to_store_registers */
 855   0,                            /* to_prepare_to_store */
 856   0,                            /* to_xfer_memory */
 857   0,                            /* to_files_info */
 858   0,                            /* to_insert_breakpoint */
 859   0,                            /* to_remove_breakpoint */
 860   0,                            /* to_terminal_init */
 861   0,                            /* to_terminal_inferior */
 862   0,                            /* to_terminal_ours_for_output */
 863   0,                            /* to_terminal_ours */
 864   0,                            /* to_terminal_info */
 865   0,                            /* to_kill */
 866   sparclite_download,           /* to_load */
 867   0,                            /* to_lookup_symbol */
 868   0,                            /* to_create_inferior */
 869   0,                            /* to_mourn_inferior */
 870   0,                            /* to_can_run */
 871   0,                            /* to_notice_signals */
 872   0,                            /* to_thread_alive */
 873   0,                            /* to_stop */
 874   download_stratum,             /* to_stratum */
 875   0,                            /* to_next */
 876   0,                            /* to_has_all_memory */
 877   0,                            /* to_has_memory */
 878   0,                            /* to_has_stack */
 879   0,                            /* to_has_registers */
 880   0,                            /* to_has_execution */
 881   0,                            /* sections */
 882   0,                            /* sections_end */
 883   OPS_MAGIC                     /* to_magic */
 884   };
 885
 886 void
 887 _initialize_sparcl_tdep ()
 888 {
 889   add_target (&sparclite_ops);
 890 }