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
  27 #if !defined(__GO32__) && !defined(_WIN32)
  28 #define HAVE_SOCKETS
  29 #include <sys/time.h>
  30 #include <unistd.h>
  31 #include <sys/socket.h>
  32 #include <netinet/in.h>
  33 #include <netdb.h>
  34 #endif
  35
  36 extern struct target_ops sparclite_ops; /* Forward decl */
  37 extern struct target_ops remote_ops;
  38
  39 static char *remote_target_name = NULL;
  40 static serial_t remote_desc = NULL;
  41 static int serial_flag;
  42 #ifdef HAVE_SOCKETS
  43 static int udp_fd = -1;
  44 #endif
  45
  46 static serial_t open_tty PARAMS ((char *name));
  47 static int send_resp PARAMS ((serial_t desc, char c));
  48 static void close_tty PARAMS ((int ignore));
  49 #ifdef HAVE_SOCKETS
  50 static int recv_udp_buf PARAMS ((int fd, unsigned char *buf, int len, int timeout));
  51 static int send_udp_buf PARAMS ((int fd, unsigned char *buf, int len));
  52 #endif
  53 static void sparclite_open PARAMS ((char *name, int from_tty));
  54 static void sparclite_close PARAMS ((int quitting));
  55 static void download PARAMS ((char *target_name, char *args, int from_tty,
  56                               void (*write_routine) (bfd *from_bfd,
  57                                                      asection *from_sec,
  58                                                      file_ptr from_addr,
  59                                                      bfd_vma to_addr, int len),
  60                               void (*start_routine) (bfd_vma entry)));
  61 static void sparclite_serial_start PARAMS ((bfd_vma entry));
  62 static void sparclite_serial_write PARAMS ((bfd *from_bfd, asection *from_sec,
  63                                             file_ptr from_addr,
  64                                             bfd_vma to_addr, int len));
  65 #ifdef HAVE_SOCKETS
  66 static unsigned short calc_checksum PARAMS ((unsigned char *buffer,
  67                                              int count));
  68 static void sparclite_udp_start PARAMS ((bfd_vma entry));
  69 static void sparclite_udp_write PARAMS ((bfd *from_bfd, asection *from_sec,
  70                                          file_ptr from_addr, bfd_vma to_addr,
  71                                          int len));
  72 #endif
  73 static void sparclite_download PARAMS ((char *filename, int from_tty));
  74
  75 #define DDA2_SUP_ASI            0xb000000
  76 #define DDA1_SUP_ASI            0xb0000
  77
  78 #define DDA2_ASI_MASK           0xff000000
  79 #define DDA1_ASI_MASK           0xff0000
  80 #define DIA2_SUP_MODE           0x8000
  81 #define DIA1_SUP_MODE           0x4000
  82 #define DDA2_ENABLE             0x100
  83 #define DDA1_ENABLE             0x80
  84 #define DIA2_ENABLE             0x40
  85 #define DIA1_ENABLE             0x20
  86 #define DSINGLE_STEP            0x10
  87 #define DDV_TYPE_MASK           0xc
  88 #define DDV_TYPE_LOAD           0x0
  89 #define DDV_TYPE_STORE          0x4
  90 #define DDV_TYPE_ACCESS         0x8
  91 #define DDV_TYPE_ALWAYS         0xc
  92 #define DDV_COND                0x2
  93 #define DDV_MASK                0x1
  94
  95 int
  96 sparclite_insert_watchpoint (addr, len, type)
  97      CORE_ADDR addr;
  98      int len;
  99      int type;
 100 {
 101   CORE_ADDR dcr;
 102
 103   dcr = read_register (DCR_REGNUM);
 104
 105   if (!(dcr & DDA1_ENABLE))
 106     {
 107       write_register (DDA1_REGNUM, addr);
 108       dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK);
 109       dcr |= (DDA1_SUP_ASI | DDA1_ENABLE);
 110       if (type == 1)
 111         {
 112           write_register (DDV1_REGNUM, 0);
 113           write_register (DDV2_REGNUM, 0xffffffff);
 114           dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK));
 115         }
 116       else if (type == 0)
 117         {
 118           write_register (DDV1_REGNUM, 0);
 119           write_register (DDV2_REGNUM, 0xffffffff);
 120           dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK));
 121         }
 122       else
 123         {
 124           write_register (DDV1_REGNUM, 0);
 125           write_register (DDV2_REGNUM, 0xffffffff);
 126           dcr |= (DDV_TYPE_ACCESS);
 127         }
 128       write_register (DCR_REGNUM, dcr);
 129     }
 130   else if (!(dcr & DDA2_ENABLE))
 131     {
 132       write_register (DDA2_REGNUM, addr);
 133       dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK);
 134       dcr |= (DDA2_SUP_ASI | DDA2_ENABLE);
 135       if (type == 1)
 136         {
 137           write_register (DDV1_REGNUM, 0);
 138           write_register (DDV2_REGNUM, 0xffffffff);
 139           dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK);
 140         }
 141       else if (type == 0)
 142         {
 143           write_register (DDV1_REGNUM, 0);
 144           write_register (DDV2_REGNUM, 0xffffffff);
 145           dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK);
 146         }
 147       else
 148         {
 149           write_register (DDV1_REGNUM, 0);
 150           write_register (DDV2_REGNUM, 0xffffffff);
 151           dcr |= (DDV_TYPE_ACCESS);
 152         }
 153       write_register (DCR_REGNUM, dcr);
 154     }
 155   else
 156     return -1;
 157
 158   return 0;
 159 }
 160
 161 int
 162 sparclite_remove_watchpoint (addr, len, type)
 163      CORE_ADDR addr;
 164      int len;
 165      int type;
 166 {
 167   CORE_ADDR dcr, dda1, dda2;
 168
 169   dcr = read_register (DCR_REGNUM);
 170   dda1 = read_register (DDA1_REGNUM);
 171   dda2 = read_register (DDA2_REGNUM);
 172
 173   if ((dcr & DDA1_ENABLE) && addr == dda1)
 174     write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE));
 175   else if ((dcr & DDA2_ENABLE) && addr == dda2)
 176     write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE));
 177   else
 178     return -1;
 179
 180   return 0;
 181 }
 182
 183 int
 184 sparclite_insert_hw_breakpoint (addr, len)
 185      CORE_ADDR addr;
 186      int len;
 187 {
 188   CORE_ADDR dcr;
 189
 190   dcr = read_register (DCR_REGNUM);
 191
 192   if (!(dcr & DIA1_ENABLE))
 193     {
 194       write_register (DIA1_REGNUM, addr);
 195       write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE));
 196     }
 197   else if (!(dcr & DIA2_ENABLE))
 198     {
 199       write_register (DIA2_REGNUM, addr);
 200       write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE));
 201     }
 202   else
 203     return -1;
 204
 205   return 0;
 206 }
 207
 208 int
 209 sparclite_remove_hw_breakpoint (addr, shadow)
 210      CORE_ADDR addr;
 211      int shadow;
 212 {
 213   CORE_ADDR dcr, dia1, dia2;
 214
 215   dcr = read_register (DCR_REGNUM);
 216   dia1 = read_register (DIA1_REGNUM);
 217   dia2 = read_register (DIA2_REGNUM);
 218
 219   if ((dcr & DIA1_ENABLE) && addr == dia1)
 220     write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE));
 221   else if ((dcr & DIA2_ENABLE) && addr == dia2)
 222     write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE));
 223   else
 224     return -1;
 225
 226   return 0;
 227 }
 228
 229 int
 230 sparclite_check_watch_resources (type, cnt, ot)
 231      int type;
 232      int cnt;
 233      int ot;
 234 {
 235   if (type == bp_hardware_breakpoint)
 236     {
 237       if (TARGET_HW_BREAK_LIMIT == 0)
 238         return 0;
 239       else if (cnt <= TARGET_HW_BREAK_LIMIT)
 240         return 1;
 241     }
 242   else
 243     {
 244       if (TARGET_HW_WATCH_LIMIT == 0)
 245         return 0;
 246       else if (ot)
 247         return -1;
 248       else if (cnt <= TARGET_HW_WATCH_LIMIT)
 249         return 1;
 250     }
 251   return -1;
 252 }
 253
 254 CORE_ADDR
 255 sparclite_stopped_data_address ()
 256 {
 257   CORE_ADDR dsr, dda1, dda2;
 258
 259   dsr = read_register (DSR_REGNUM);
 260   dda1 = read_register (DDA1_REGNUM);
 261   dda2 = read_register (DDA2_REGNUM);
 262
 263   if (dsr & 0x10)
 264     return dda1;
 265   else if (dsr & 0x20)
 266     return dda2;
 267   else
 268     return 0;
 269 }
 270 \f
 271 static serial_t
 272 open_tty (name)
 273      char *name;
 274 {
 275   serial_t desc;
 276
 277   desc = SERIAL_OPEN (name);
 278   if (!desc)
 279     perror_with_name (name);
 280
 281   if (baud_rate != -1)
 282     {
 283       if (SERIAL_SETBAUDRATE (desc, baud_rate))
 284         {
 285           SERIAL_CLOSE (desc);
 286           perror_with_name (name);
 287         }
 288     }
 289
 290   SERIAL_RAW (desc);
 291
 292   SERIAL_FLUSH_INPUT (desc);
 293
 294   return desc;
 295 }
 296
 297 /* Read a single character from the remote end, masking it down to 7 bits. */
 298
 299 static int
 300 readchar (desc, timeout)
 301      serial_t desc;
 302      int timeout;
 303 {
 304   int ch;
 305   char s[10];
 306
 307   ch = SERIAL_READCHAR (desc, timeout);
 308
 309   switch (ch)
 310     {
 311     case SERIAL_EOF:
 312       error ("SPARClite remote connection closed");
 313     case SERIAL_ERROR:
 314       perror_with_name ("SPARClite communication error");
 315     case SERIAL_TIMEOUT:
 316       error ("SPARClite remote timeout");
 317     default:
 318       if (remote_debug > 0)
 319         {
 320           sprintf (s, "[%02x]", ch & 0xff);
 321           puts_debug ("read -->", s, "<--");
 322         }
 323       return ch;
 324     }
 325 }
 326
 327 static void
 328 debug_serial_write (desc, buf, len)
 329      serial_t desc;
 330      char *buf;
 331      int len;
 332 {
 333   char s[10];
 334
 335   SERIAL_WRITE (desc, buf, len);
 336   if (remote_debug > 0)
 337     {
 338       while (len-- > 0)
 339         {
 340           sprintf (s, "[%02x]", *buf & 0xff);
 341           puts_debug ("Sent -->", s, "<--");
 342           buf++;
 343         }
 344     }
 345 }
 346
 347
 348 static int
 349 send_resp (desc, c)
 350      serial_t desc;
 351      char c;
 352 {
 353   debug_serial_write (desc, &c, 1);
 354   return readchar (desc, 2);
 355 }
 356
 357 static void
 358 close_tty (ignore)
 359      int ignore;
 360 {
 361   if (!remote_desc)
 362     return;
 363
 364   SERIAL_CLOSE (remote_desc);
 365
 366   remote_desc = NULL;
 367 }
 368
 369 #ifdef HAVE_SOCKETS
 370 static int
 371 recv_udp_buf (fd, buf, len, timeout)
 372      int fd, len;
 373      unsigned char *buf;
 374      int timeout;
 375 {
 376   int cc;
 377   fd_set readfds;
 378
 379   FD_ZERO (&readfds);
 380   FD_SET (fd, &readfds);
 381
 382   if (timeout >= 0)
 383     {
 384       struct timeval timebuf;
 385
 386       timebuf.tv_sec = timeout;
 387       timebuf.tv_usec = 0;
 388       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 389     }
 390   else
 391     cc = select (fd + 1, &readfds, 0, 0, 0);
 392
 393   if (cc == 0)
 394     return 0;
 395
 396   if (cc != 1)
 397     perror_with_name ("recv_udp_buf: Bad return value from select:");
 398
 399   cc = recv (fd, buf, len, 0);
 400
 401   if (cc < 0)
 402     perror_with_name ("Got an error from recv: ");
 403 }
 404
 405 static int
 406 send_udp_buf (fd, buf, len)
 407      int fd, len;
 408      unsigned char *buf;
 409 {
 410   int cc;
 411
 412   cc = send (fd, buf, len, 0);
 413
 414   if (cc == len)
 415     return;
 416
 417   if (cc < 0)
 418     perror_with_name ("Got an error from send: ");
 419
 420   error ("Short count in send: tried %d, sent %d\n", len, cc);
 421 }
 422 #endif /* HAVE_SOCKETS */
 423
 424 static void
 425 sparclite_open (name, from_tty)
 426      char *name;
 427      int from_tty;
 428 {
 429   struct cleanup *old_chain;
 430   int c;
 431   char *p;
 432
 433   if (!name)
 434     error ("You need to specify what device or hostname is associated with the SparcLite board.");
 435
 436   target_preopen (from_tty);
 437
 438   unpush_target (&sparclite_ops);
 439
 440   if (remote_target_name)
 441     free (remote_target_name);
 442
 443   remote_target_name = strsave (name);
 444
 445   /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
 446      mean either a serial port on a terminal server, or the IP address of a
 447      SPARClite demo board.  If there's no colon, then it pretty much has to be
 448      a local device (except for DOS... grrmble) */
 449
 450   p = strchr (name, ' ');
 451
 452   if (p)
 453     {
 454       *p++ = '\000';
 455       while ((*p != '\000') && isspace (*p)) p++;
 456
 457       if (strncmp (name, "serial", strlen (name)) == 0)
 458         serial_flag = 1;
 459       else if (strncmp (name, "udp", strlen (name)) == 0)
 460         serial_flag = 0;
 461       else
 462         error ("Must specify either `serial' or `udp'.");
 463     }
 464   else
 465     {
 466       p = name;
 467
 468       if (!strchr (name, ':'))
 469         serial_flag = 1;        /* No colon is unambiguous (local device) */
 470       else
 471         error ("Usage: target sparclite serial /dev/ttyb\n\
 472 or: target sparclite udp host");
 473     }
 474
 475   if (serial_flag)
 476     {
 477       remote_desc = open_tty (p);
 478
 479       old_chain = make_cleanup (close_tty, 0);
 480
 481       c = send_resp (remote_desc, 0x00);
 482
 483       if (c != 0xaa)
 484         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 485                c);
 486
 487       c = send_resp (remote_desc, 0x55);
 488
 489       if (c != 0x55)
 490         error ("Sparclite appears to be ill.");
 491     }
 492   else
 493     {
 494 #ifdef HAVE_SOCKETS
 495       struct hostent *he;
 496       struct sockaddr_in sockaddr;
 497       unsigned char buffer[100];
 498       int cc;
 499
 500       /* Setup the socket.  Must be raw UDP. */
 501
 502       he = gethostbyname (p);
 503
 504       if (!he)
 505         error ("No such host %s.", p);
 506
 507       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 508
 509       old_chain = make_cleanup (close, udp_fd);
 510
 511       sockaddr.sin_family = PF_INET;
 512       sockaddr.sin_port = htons(7000);
 513       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 514
 515       if (connect (udp_fd, &sockaddr, sizeof(sockaddr)))
 516         perror_with_name ("Connect failed");
 517
 518       buffer[0] = 0x5;
 519       buffer[1] = 0;
 520
 521       send_udp_buf (udp_fd, buffer, 2); /* Request version */
 522       cc = recv_udp_buf (udp_fd, buffer, sizeof(buffer), 5); /* Get response */
 523       if (cc == 0)
 524         error ("SPARClite isn't responding.");
 525
 526       if (cc < 3)
 527         error ("SPARClite appears to be ill.");
 528 #else
 529       error ("UDP downloading is not supported for DOS hosts.");
 530 #endif /* HAVE_SOCKETS */
 531     }
 532
 533   printf_unfiltered ("[SPARClite appears to be alive]\n");
 534
 535   push_target (&sparclite_ops);
 536
 537   discard_cleanups (old_chain);
 538
 539   return;
 540 }
 541
 542 static void
 543 sparclite_close (quitting)
 544      int quitting;
 545 {
 546   if (serial_flag)
 547     close_tty (0);
 548 #ifdef HAVE_SOCKETS
 549   else
 550     if (udp_fd != -1)
 551       close (udp_fd);
 552 #endif
 553 }
 554
 555 #define LOAD_ADDRESS 0x40000000
 556
 557 static void
 558 download (target_name, args, from_tty, write_routine, start_routine)
 559      char *target_name;
 560      char *args;
 561      int from_tty;
 562      void (*write_routine) PARAMS ((bfd *from_bfd, asection *from_sec,
 563                                     file_ptr from_addr, bfd_vma to_addr, int len));
 564      void (*start_routine) PARAMS ((bfd_vma entry));
 565 {
 566   struct cleanup *old_chain;
 567   asection *section;
 568   bfd *pbfd;
 569   bfd_vma entry;
 570   int i;
 571 #define WRITESIZE 1024
 572   char *filename;
 573   int quiet;
 574   int nostart;
 575
 576   quiet = 0;
 577   nostart = 0;
 578   filename = NULL;
 579
 580   while (*args != '\000')
 581     {
 582       char *arg;
 583
 584       while (isspace (*args)) args++;
 585
 586       arg = args;
 587
 588       while ((*args != '\000') && !isspace (*args)) args++;
 589
 590       if (*args != '\000')
 591         *args++ = '\000';
 592
 593       if (*arg != '-')
 594         filename = arg;
 595       else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
 596         quiet = 1;
 597       else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
 598         nostart = 1;
 599       else
 600         error ("unknown option `%s'", arg);
 601     }
 602
 603   if (!filename)
 604     filename = get_exec_file (1);
 605
 606   pbfd = bfd_openr (filename, gnutarget);
 607   if (pbfd == NULL)
 608     {
 609       perror_with_name (filename);
 610       return;
 611     }
 612   old_chain = make_cleanup (bfd_close, pbfd);
 613
 614   if (!bfd_check_format (pbfd, bfd_object))
 615     error ("\"%s\" is not an object file: %s", filename,
 616            bfd_errmsg (bfd_get_error ()));
 617
 618   for (section = pbfd->sections; section; section = section->next)
 619     {
 620       if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
 621         {
 622           bfd_vma section_address;
 623           bfd_size_type section_size;
 624           file_ptr fptr;
 625
 626           section_address = bfd_get_section_vma (pbfd, section);
 627           /* Adjust sections from a.out files, since they don't
 628              carry their addresses with.  */
 629           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 630             section_address += LOAD_ADDRESS;
 631
 632           section_size = bfd_get_section_size_before_reloc (section);
 633
 634           if (!quiet)
 635             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 636                              bfd_get_section_name (pbfd, section),
 637                              section_address,
 638                              section_size);
 639
 640           fptr = 0;
 641           while (section_size > 0)
 642             {
 643               int count;
 644               static char inds[] = "|/-\\";
 645               static int k = 0;
 646
 647               QUIT;
 648
 649               count = min (section_size, WRITESIZE);
 650
 651               write_routine (pbfd, section, fptr, section_address, count);
 652
 653               if (!quiet)
 654                 {
 655                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 656                   gdb_flush (gdb_stdout);
 657                 }
 658
 659               section_address += count;
 660               fptr += count;
 661               section_size -= count;
 662             }
 663         }
 664     }
 665
 666   if (!nostart)
 667     {
 668       entry = bfd_get_start_address (pbfd);
 669
 670       if (!quiet)
 671         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 672
 673       start_routine (entry);
 674     }
 675
 676   do_cleanups (old_chain);
 677 }
 678
 679 static void
 680 sparclite_serial_start (entry)
 681      bfd_vma entry;
 682 {
 683   char buffer[5];
 684   int i;
 685
 686   buffer[0] = 0x03;
 687   store_unsigned_integer (buffer + 1, 4, entry);
 688
 689   debug_serial_write (remote_desc, buffer, 1 + 4);
 690   i = readchar (remote_desc, 2);
 691   if (i != 0x55)
 692     error ("Can't start SparcLite.  Error code %d\n", i);
 693 }
 694
 695 static void
 696 sparclite_serial_write (from_bfd, from_sec, from_addr, to_addr, len)
 697      bfd *from_bfd;
 698      asection *from_sec;
 699      file_ptr from_addr;
 700      bfd_vma to_addr;
 701      int len;
 702 {
 703   char buffer[4 + 4 + WRITESIZE]; /* addr + len + data */
 704   unsigned char checksum;
 705   int i;
 706
 707   store_unsigned_integer (buffer, 4, to_addr); /* Address */
 708   store_unsigned_integer (buffer + 4, 4, len); /* Length */
 709
 710   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 711
 712   checksum = 0;
 713   for (i = 0; i < len; i++)
 714     checksum += buffer[8 + i];
 715
 716   i = send_resp (remote_desc, 0x01);
 717
 718   if (i != 0x5a)
 719     error ("Bad response from load command (0x%x)", i);
 720
 721   debug_serial_write (remote_desc, buffer, 4 + 4 + len);
 722   i = readchar (remote_desc, 2);
 723
 724   if (i != checksum)
 725     error ("Bad checksum from load command (0x%x)", i);
 726 }
 727
 728 #ifdef HAVE_SOCKETS
 729
 730 static unsigned short
 731 calc_checksum (buffer, count)
 732      unsigned char *buffer;
 733      int count;
 734 {
 735   unsigned short checksum;
 736
 737   checksum = 0;
 738   for (; count > 0; count -= 2, buffer += 2)
 739     checksum += (*buffer << 8) | *(buffer + 1);
 740
 741   if (count != 0)
 742     checksum += *buffer << 8;
 743
 744   return checksum;
 745 }
 746
 747 static void
 748 sparclite_udp_start (entry)
 749      bfd_vma entry;
 750 {
 751   unsigned char buffer[6];
 752   int i;
 753
 754   buffer[0] = 0x3;
 755   buffer[1] = 0;
 756   buffer[2] = entry >> 24;
 757   buffer[3] = entry >> 16;
 758   buffer[4] = entry >> 8;
 759   buffer[5] = entry;
 760
 761   send_udp_buf (udp_fd, buffer, 6); /* Send start addr */
 762   i = recv_udp_buf (udp_fd, buffer, sizeof(buffer), -1); /* Get response */
 763
 764   if (i < 1 || buffer[0] != 0x55)
 765     error ("Failed to take start address.");
 766 }
 767
 768 static void
 769 sparclite_udp_write (from_bfd, from_sec, from_addr, to_addr, len)
 770      bfd *from_bfd;
 771      asection *from_sec;
 772      file_ptr from_addr;
 773      bfd_vma to_addr;
 774      int len;
 775 {
 776   unsigned char buffer[2000];
 777   unsigned short checksum;
 778   static int pkt_num = 0;
 779   static unsigned long old_addr = -1;
 780   int i;
 781
 782   while (1)
 783     {
 784       if (to_addr != old_addr)
 785         {
 786           buffer[0] = 0x1;      /* Load command */
 787           buffer[1] = 0x1;      /* Loading address */
 788           buffer[2] = to_addr >> 24;
 789           buffer[3] = to_addr >> 16;
 790           buffer[4] = to_addr >> 8;
 791           buffer[5] = to_addr;
 792
 793           checksum = 0;
 794           for (i = 0; i < 6; i++)
 795             checksum += buffer[i];
 796           checksum &= 0xff;
 797
 798           send_udp_buf (udp_fd, buffer, 6);
 799           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 800
 801           if (i < 1)
 802             error ("Got back short checksum for load addr.");
 803
 804           if (checksum != buffer[0])
 805             error ("Got back bad checksum for load addr.");
 806
 807           pkt_num = 0;          /* Load addr resets packet seq # */
 808           old_addr = to_addr;
 809         }
 810
 811       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 812                                 len);
 813
 814       checksum = calc_checksum (buffer + 6, len);
 815
 816       buffer[0] = 0x1;          /* Load command */
 817       buffer[1] = 0x2;          /* Loading data */
 818       buffer[2] = pkt_num >> 8;
 819       buffer[3] = pkt_num;
 820       buffer[4] = checksum >> 8;
 821       buffer[5] = checksum;
 822
 823       send_udp_buf (udp_fd, buffer, len + 6);
 824       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 825
 826       if (i == 0)
 827         {
 828           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 829           continue;
 830         }
 831
 832       if (buffer[0] != 0xff)
 833         error ("Got back bad response for load data.");
 834
 835       old_addr += len;
 836       pkt_num++;
 837
 838       return;
 839     }
 840 }
 841
 842 #endif /* HAVE_SOCKETS */
 843
 844 static void
 845 sparclite_download (filename, from_tty)
 846      char *filename;
 847      int from_tty;
 848 {
 849   if (!serial_flag)
 850 #ifdef HAVE_SOCKETS
 851     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 852               sparclite_udp_start);
 853 #else
 854     abort ();                   /* sparclite_open should prevent this! */
 855 #endif
 856   else
 857     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 858               sparclite_serial_start);
 859 }
 860 \f
 861 /* Define the target subroutine names */
 862
 863 static struct target_ops sparclite_ops =
 864 {
 865   "sparclite",                  /* to_shortname */
 866   "SPARClite remote target",    /* to_longname */
 867   "Use a remote SPARClite target board via a serial line, using a gdb-specific protocol.\n\
 868 Specify the serial device it is connected to (e.g. /dev/ttya).",  /* to_doc */
 869   sparclite_open,               /* to_open */
 870   sparclite_close,              /* to_close */
 871   0,                            /* to_attach */
 872   0,                            /* to_detach */
 873   0,                            /* to_resume */
 874   0,                            /* to_wait */
 875   0,                            /* to_fetch_registers */
 876   0,                            /* to_store_registers */
 877   0,                            /* to_prepare_to_store */
 878   0,                            /* to_xfer_memory */
 879   0,                            /* to_files_info */
 880   0,                            /* to_insert_breakpoint */
 881   0,                            /* to_remove_breakpoint */
 882   0,                            /* to_terminal_init */
 883   0,                            /* to_terminal_inferior */
 884   0,                            /* to_terminal_ours_for_output */
 885   0,                            /* to_terminal_ours */
 886   0,                            /* to_terminal_info */
 887   0,                            /* to_kill */
 888   sparclite_download,           /* to_load */
 889   0,                            /* to_lookup_symbol */
 890   0,                            /* to_create_inferior */
 891   0,                            /* to_mourn_inferior */
 892   0,                            /* to_can_run */
 893   0,                            /* to_notice_signals */
 894   0,                            /* to_thread_alive */
 895   0,                            /* to_stop */
 896   download_stratum,             /* to_stratum */
 897   0,                            /* to_next */
 898   0,                            /* to_has_all_memory */
 899   0,                            /* to_has_memory */
 900   0,                            /* to_has_stack */
 901   0,                            /* to_has_registers */
 902   0,                            /* to_has_execution */
 903   0,                            /* sections */
 904   0,                            /* sections_end */
 905   OPS_MAGIC                     /* to_magic */
 906   };
 907
 908 void
 909 _initialize_sparcl_tdep ()
 910 {
 911   add_target (&sparclite_ops);
 912 }