gdb/sparcl-tdep.c

   1 /* Target dependent code for the Fujitsu SPARClite for GDB, the GNU debugger.
   2    Copyright 1994, 1995  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     if (TARGET_HW_BREAK_LIMIT == 0)
 243       return 0;
 244     else if (cnt <= TARGET_HW_BREAK_LIMIT)
 245       return 1;
 246   else
 247     if (TARGET_HW_WATCH_LIMIT == 0)
 248       return 0;
 249     else if (ot)
 250       return -1;
 251     else if (cnt <= TARGET_HW_WATCH_LIMIT)
 252       return 1;
 253   return -1;
 254 }
 255
 256 CORE_ADDR
 257 sparclite_stopped_data_address ()
 258 {
 259   CORE_ADDR dsr, dda1, dda2;
 260
 261   dsr = read_register (DSR_REGNUM);
 262   dda1 = read_register (DDA1_REGNUM);
 263   dda2 = read_register (DDA2_REGNUM);
 264
 265   if (dsr & 0x10)
 266     return dda1;
 267   else if (dsr & 0x20)
 268     return dda2;
 269   else
 270     return 0;
 271 }
 272 \f
 273 static serial_t
 274 open_tty (name)
 275      char *name;
 276 {
 277   serial_t desc;
 278
 279   desc = SERIAL_OPEN (name);
 280   if (!desc)
 281     perror_with_name (name);
 282
 283   if (baud_rate != -1)
 284     {
 285       if (SERIAL_SETBAUDRATE (desc, baud_rate))
 286         {
 287           SERIAL_CLOSE (desc);
 288           perror_with_name (name);
 289         }
 290     }
 291
 292   SERIAL_RAW (desc);
 293
 294   SERIAL_FLUSH_INPUT (desc);
 295
 296   return desc;
 297 }
 298
 299 static int
 300 send_resp (desc, c)
 301      serial_t desc;
 302      char c;
 303 {
 304   int i;
 305
 306   SERIAL_WRITE (desc, &c, 1);
 307   i = SERIAL_READCHAR (desc, 2);
 308
 309   if (i >= 0)
 310     return i;
 311
 312   switch (i)
 313     {
 314     case SERIAL_ERROR:
 315       perror_with_name ("Remote communication error");
 316     case SERIAL_TIMEOUT:
 317       error ("Remote timeout");
 318     case SERIAL_EOF:
 319       error ("Remote connection closed");
 320     }
 321 }
 322
 323 static void
 324 close_tty (ignore)
 325      int ignore;
 326 {
 327   if (!remote_desc)
 328     return;
 329
 330   SERIAL_CLOSE (remote_desc);
 331
 332   remote_desc = NULL;
 333 }
 334
 335 #ifdef HAVE_SOCKETS
 336 static int
 337 recv_udp_buf (fd, buf, len, timeout)
 338      int fd, len;
 339      unsigned char *buf;
 340      int timeout;
 341 {
 342   int cc;
 343   fd_set readfds;
 344
 345   FD_ZERO (&readfds);
 346   FD_SET (fd, &readfds);
 347
 348   if (timeout >= 0)
 349     {
 350       struct timeval timebuf;
 351
 352       timebuf.tv_sec = timeout;
 353       timebuf.tv_usec = 0;
 354       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 355     }
 356   else
 357     cc = select (fd + 1, &readfds, 0, 0, 0);
 358
 359   if (cc == 0)
 360     return 0;
 361
 362   if (cc != 1)
 363     perror_with_name ("recv_udp_buf: Bad return value from select:");
 364
 365   cc = recv (fd, buf, len, 0);
 366
 367   if (cc < 0)
 368     perror_with_name ("Got an error from recv: ");
 369 }
 370
 371 static int
 372 send_udp_buf (fd, buf, len)
 373      int fd, len;
 374      unsigned char *buf;
 375 {
 376   int cc;
 377
 378   cc = send (fd, buf, len, 0);
 379
 380   if (cc == len)
 381     return;
 382
 383   if (cc < 0)
 384     perror_with_name ("Got an error from send: ");
 385
 386   error ("Short count in send: tried %d, sent %d\n", len, cc);
 387 }
 388 #endif /* __GO32__ */
 389
 390 static void
 391 sparclite_open (name, from_tty)
 392      char *name;
 393      int from_tty;
 394 {
 395   struct cleanup *old_chain;
 396   int c;
 397   char *p;
 398
 399   if (!name)
 400     error ("You need to specify what device or hostname is associated with the SparcLite board.");
 401
 402   target_preopen (from_tty);
 403
 404   unpush_target (&sparclite_ops);
 405
 406   if (remote_target_name)
 407     free (remote_target_name);
 408
 409   remote_target_name = strsave (name);
 410
 411   /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
 412      mean either a serial port on a terminal server, or the IP address of a
 413      SPARClite demo board.  If there's no colon, then it pretty much has to be
 414      a local device (except for DOS... grrmble) */
 415
 416   p = strchr (name, ' ');
 417
 418   if (p)
 419     {
 420       *p++ = '\000';
 421       while ((*p != '\000') && isspace (*p)) p++;
 422
 423       if (strncmp (name, "serial", strlen (name)) == 0)
 424         serial_flag = 1;
 425       else if (strncmp (name, "udp", strlen (name)) == 0)
 426         serial_flag = 0;
 427       else
 428         error ("Must specify either `serial' or `udp'.");
 429     }
 430   else
 431     {
 432       p = name;
 433
 434       if (!strchr (name, ':'))
 435         serial_flag = 1;        /* No colon is unambiguous (local device) */
 436       else
 437         error ("Usage: target sparclite serial /dev/ttyb\n\
 438 or: target sparclite udp host");
 439     }
 440
 441   if (serial_flag)
 442     {
 443       remote_desc = open_tty (p);
 444
 445       old_chain = make_cleanup (close_tty, 0);
 446
 447       c = send_resp (remote_desc, 0x00);
 448
 449       if (c != 0xaa)
 450         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 451                c);
 452
 453       c = send_resp (remote_desc, 0x55);
 454
 455       if (c != 0x55)
 456         error ("Sparclite appears to be ill.");
 457     }
 458   else
 459     {
 460 #ifdef HAVE_SOCKETS
 461       struct hostent *he;
 462       struct sockaddr_in sockaddr;
 463       unsigned char buffer[100];
 464       int cc;
 465
 466       /* Setup the socket.  Must be raw UDP. */
 467
 468       he = gethostbyname (p);
 469
 470       if (!he)
 471         error ("No such host %s.", p);
 472
 473       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 474
 475       old_chain = make_cleanup (close, udp_fd);
 476
 477       sockaddr.sin_family = PF_INET;
 478       sockaddr.sin_port = htons(7000);
 479       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 480
 481       if (connect (udp_fd, &sockaddr, sizeof(sockaddr)))
 482         perror_with_name ("Connect failed");
 483
 484       buffer[0] = 0x5;
 485       buffer[1] = 0;
 486
 487       send_udp_buf (udp_fd, buffer, 2); /* Request version */
 488       cc = recv_udp_buf (udp_fd, buffer, sizeof(buffer), 5); /* Get response */
 489       if (cc == 0)
 490         error ("SPARClite isn't responding.");
 491
 492       if (cc < 3)
 493         error ("SPARClite appears to be ill.");
 494 #else
 495       error ("UDP downloading is not supported for DOS hosts.");
 496 #endif /* __GO32__ */
 497     }
 498
 499   printf_unfiltered ("[SPARClite appears to be alive]\n");
 500
 501   push_target (&sparclite_ops);
 502
 503   discard_cleanups (old_chain);
 504
 505   return;
 506 }
 507
 508 static void
 509 sparclite_close (quitting)
 510      int quitting;
 511 {
 512   if (serial_flag)
 513     close_tty (0);
 514 #ifdef HAVE_SOCKETS
 515   else
 516     if (udp_fd != -1)
 517       close (udp_fd);
 518 #endif
 519 }
 520
 521 #define LOAD_ADDRESS 0x40000000
 522
 523 static void
 524 download (target_name, args, from_tty, write_routine, start_routine)
 525      char *target_name;
 526      char *args;
 527      int from_tty;
 528      void (*write_routine)();
 529      void (*start_routine)();
 530 {
 531   struct cleanup *old_chain;
 532   asection *section;
 533   bfd *pbfd;
 534   bfd_vma entry;
 535   int i;
 536 #define WRITESIZE 1024
 537   char *filename;
 538   int quiet;
 539   int nostart;
 540
 541   quiet = 0;
 542   nostart = 0;
 543   filename = NULL;
 544
 545   while (*args != '\000')
 546     {
 547       char *arg;
 548
 549       while (isspace (*args)) args++;
 550
 551       arg = args;
 552
 553       while ((*args != '\000') && !isspace (*args)) args++;
 554
 555       if (*args != '\000')
 556         *args++ = '\000';
 557
 558       if (*arg != '-')
 559         filename = arg;
 560       else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
 561         quiet = 1;
 562       else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
 563         nostart = 1;
 564       else
 565         error ("unknown option `%s'", arg);
 566     }
 567
 568   if (!filename)
 569     filename = get_exec_file (1);
 570
 571   pbfd = bfd_openr (filename, gnutarget);
 572   if (pbfd == NULL)
 573     {
 574       perror_with_name (filename);
 575       return;
 576     }
 577   old_chain = make_cleanup (bfd_close, pbfd);
 578
 579   if (!bfd_check_format (pbfd, bfd_object))
 580     error ("\"%s\" is not an object file: %s", filename,
 581            bfd_errmsg (bfd_get_error ()));
 582
 583   for (section = pbfd->sections; section; section = section->next)
 584     {
 585       if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
 586         {
 587           bfd_vma section_address;
 588           bfd_size_type section_size;
 589           file_ptr fptr;
 590
 591           section_address = bfd_get_section_vma (pbfd, section);
 592           /* Adjust sections from a.out files, since they don't
 593              carry their addresses with.  */
 594           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 595             section_address += LOAD_ADDRESS;
 596
 597           section_size = bfd_get_section_size_before_reloc (section);
 598
 599           if (!quiet)
 600             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 601                              bfd_get_section_name (pbfd, section),
 602                              section_address,
 603                              section_size);
 604
 605           fptr = 0;
 606           while (section_size > 0)
 607             {
 608               int count;
 609               static char inds[] = "|/-\\";
 610               static int k = 0;
 611
 612               QUIT;
 613
 614               count = min (section_size, WRITESIZE);
 615
 616               write_routine (pbfd, section, fptr, section_address, count);
 617
 618               if (!quiet)
 619                 {
 620                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 621                   gdb_flush (gdb_stdout);
 622                 }
 623
 624               section_address += count;
 625               fptr += count;
 626               section_size -= count;
 627             }
 628         }
 629     }
 630
 631   if (!nostart)
 632     {
 633       entry = bfd_get_start_address (pbfd);
 634
 635       if (!quiet)
 636         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 637
 638       start_routine (entry);
 639     }
 640
 641   do_cleanups (old_chain);
 642 }
 643
 644 static void
 645 sparclite_serial_start (entry)
 646      bfd_vma entry;
 647 {
 648   char buffer[5];
 649   int i;
 650
 651   buffer[0] = 0x03;
 652   store_unsigned_integer (buffer + 1, 4, entry);
 653
 654   SERIAL_WRITE (remote_desc, buffer, 1 + 4);
 655   i = SERIAL_READCHAR (remote_desc, 2);
 656   if (i != 0x55)
 657     error ("Can't start SparcLite.  Error code %d\n", i);
 658 }
 659
 660 static void
 661 sparclite_serial_write (from_bfd, from_sec, from_addr, to_addr, len)
 662      bfd *from_bfd;
 663      asection *from_sec;
 664      file_ptr from_addr;
 665      bfd_vma to_addr;
 666      int len;
 667 {
 668   char buffer[4 + 4 + WRITESIZE]; /* addr + len + data */
 669   unsigned char checksum;
 670   int i;
 671
 672   store_unsigned_integer (buffer, 4, to_addr); /* Address */
 673   store_unsigned_integer (buffer + 4, 4, len); /* Length */
 674
 675   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 676
 677   checksum = 0;
 678   for (i = 0; i < len; i++)
 679     checksum += buffer[8 + i];
 680
 681   i = send_resp (remote_desc, 0x01);
 682
 683   if (i != 0x5a)
 684     error ("Bad response from load command (0x%x)", i);
 685
 686   SERIAL_WRITE (remote_desc, buffer, 4 + 4 + len);
 687   i = SERIAL_READCHAR (remote_desc, 2);
 688   if (i < 0)
 689     error ("I/O error in serial code.  Return code %d\n", i);
 690
 691   if (i != checksum)
 692     error ("Bad checksum from load command (0x%x)", i);
 693 }
 694
 695 #ifdef HAVE_SOCKETS
 696
 697 static unsigned short
 698 calc_checksum (buffer, count)
 699      unsigned char *buffer;
 700      int count;
 701 {
 702   unsigned short checksum;
 703
 704   checksum = 0;
 705   for (; count > 0; count -= 2, buffer += 2)
 706     checksum += (*buffer << 8) | *(buffer + 1);
 707
 708   if (count != 0)
 709     checksum += *buffer << 8;
 710
 711   return checksum;
 712 }
 713
 714 static void
 715 sparclite_udp_start (entry)
 716      bfd_vma entry;
 717 {
 718   unsigned char buffer[6];
 719   int i;
 720
 721   buffer[0] = 0x3;
 722   buffer[1] = 0;
 723   buffer[2] = entry >> 24;
 724   buffer[3] = entry >> 16;
 725   buffer[4] = entry >> 8;
 726   buffer[5] = entry;
 727
 728   send_udp_buf (udp_fd, buffer, 6); /* Send start addr */
 729   i = recv_udp_buf (udp_fd, buffer, sizeof(buffer), -1); /* Get response */
 730
 731   if (i < 1 || buffer[0] != 0x55)
 732     error ("Failed to take start address.");
 733 }
 734
 735 static void
 736 sparclite_udp_write (from_bfd, from_sec, from_addr, to_addr, len)
 737      bfd *from_bfd;
 738      asection *from_sec;
 739      file_ptr from_addr;
 740      bfd_vma to_addr;
 741      int len;
 742 {
 743   unsigned char buffer[2000];
 744   unsigned short checksum;
 745   static int pkt_num = 0;
 746   static unsigned long old_addr = -1;
 747   int i;
 748
 749   while (1)
 750     {
 751       if (to_addr != old_addr)
 752         {
 753           buffer[0] = 0x1;      /* Load command */
 754           buffer[1] = 0x1;      /* Loading address */
 755           buffer[2] = to_addr >> 24;
 756           buffer[3] = to_addr >> 16;
 757           buffer[4] = to_addr >> 8;
 758           buffer[5] = to_addr;
 759
 760           checksum = 0;
 761           for (i = 0; i < 6; i++)
 762             checksum += buffer[i];
 763           checksum &= 0xff;
 764
 765           send_udp_buf (udp_fd, buffer, 6);
 766           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 767
 768           if (i < 1)
 769             error ("Got back short checksum for load addr.");
 770
 771           if (checksum != buffer[0])
 772             error ("Got back bad checksum for load addr.");
 773
 774           pkt_num = 0;          /* Load addr resets packet seq # */
 775           old_addr = to_addr;
 776         }
 777
 778       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 779                                 len);
 780
 781       checksum = calc_checksum (buffer + 6, len);
 782
 783       buffer[0] = 0x1;          /* Load command */
 784       buffer[1] = 0x2;          /* Loading data */
 785       buffer[2] = pkt_num >> 8;
 786       buffer[3] = pkt_num;
 787       buffer[4] = checksum >> 8;
 788       buffer[5] = checksum;
 789
 790       send_udp_buf (udp_fd, buffer, len + 6);
 791       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 792
 793       if (i == 0)
 794         {
 795           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 796           continue;
 797         }
 798
 799       if (buffer[0] != 0xff)
 800         error ("Got back bad response for load data.");
 801
 802       old_addr += len;
 803       pkt_num++;
 804
 805       return;
 806     }
 807 }
 808
 809 #endif /* __GO32__ */
 810
 811 static void
 812 sparclite_download (filename, from_tty)
 813      char *filename;
 814      int from_tty;
 815 {
 816   if (!serial_flag)
 817 #ifdef HAVE_SOCKETS
 818     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 819               sparclite_udp_start);
 820 #else
 821     abort ();                   /* sparclite_open should prevent this! */
 822 #endif
 823   else
 824     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 825               sparclite_serial_start);
 826 }
 827 \f
 828 /* Define the target subroutine names */
 829
 830 static struct target_ops sparclite_ops =
 831 {
 832   "sparclite",                  /* to_shortname */
 833   "SPARClite remote target",    /* to_longname */
 834   "Use a remote SPARClite target board via a serial line, using a gdb-specific protocol.\n\
 835 Specify the serial device it is connected to (e.g. /dev/ttya).",  /* to_doc */
 836   sparclite_open,               /* to_open */
 837   sparclite_close,              /* to_close */
 838   0,                            /* to_attach */
 839   0,                            /* to_detach */
 840   0,                            /* to_resume */
 841   0,                            /* to_wait */
 842   0,                            /* to_fetch_registers */
 843   0,                            /* to_store_registers */
 844   0,                            /* to_prepare_to_store */
 845   0,                            /* to_xfer_memory */
 846   0,                            /* to_files_info */
 847   0,                            /* to_insert_breakpoint */
 848   0,                            /* to_remove_breakpoint */
 849   0,                            /* to_terminal_init */
 850   0,                            /* to_terminal_inferior */
 851   0,                            /* to_terminal_ours_for_output */
 852   0,                            /* to_terminal_ours */
 853   0,                            /* to_terminal_info */
 854   0,                            /* to_kill */
 855   sparclite_download,           /* to_load */
 856   0,                            /* to_lookup_symbol */
 857   0,                            /* to_create_inferior */
 858   0,                            /* to_mourn_inferior */
 859   0,                            /* to_can_run */
 860   0,                            /* to_notice_signals */
 861   0,                            /* to_thread_alive */
 862   0,                            /* to_stop */
 863   download_stratum,             /* to_stratum */
 864   0,                            /* to_next */
 865   0,                            /* to_has_all_memory */
 866   0,                            /* to_has_memory */
 867   0,                            /* to_has_stack */
 868   0,                            /* to_has_registers */
 869   0,                            /* to_has_execution */
 870   0,                            /* sections */
 871   0,                            /* sections_end */
 872   OPS_MAGIC                     /* to_magic */
 873   };
 874
 875 void
 876 _initialize_sparcl_tdep ()
 877 {
 878   add_target (&sparclite_ops);
 879 }