gdb/sparcl-tdep.c

   1 /* Target dependent code for the Fujitsu SPARClite for GDB, the GNU debugger.
   2    Copyright 1994, 1995, 1996, 1999  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,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "gdbcore.h"
  23 #include "breakpoint.h"
  24 #include "target.h"
  25 #include "serial.h"
  26 #include <sys/types.h>
  27
  28 #if (!defined(__GO32__) && !defined(_WIN32)) || defined(__CYGWIN32__)
  29 #define HAVE_SOCKETS
  30 #include <sys/time.h>
  31 #include <unistd.h>
  32 #include <sys/socket.h>
  33 #include <netinet/in.h>
  34 #include <netdb.h>
  35 #endif
  36
  37 static struct target_ops sparclite_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    /* not used */
  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   /* Watchpoints not supported on simulator.  */
 236   if (strcmp (target_shortname, "sim") == 0)
 237     return 0;
 238
 239   if (type == bp_hardware_breakpoint)
 240     {
 241       if (TARGET_HW_BREAK_LIMIT == 0)
 242         return 0;
 243       else if (cnt <= TARGET_HW_BREAK_LIMIT)
 244         return 1;
 245     }
 246   else
 247     {
 248       if (TARGET_HW_WATCH_LIMIT == 0)
 249         return 0;
 250       else if (ot)
 251         return -1;
 252       else if (cnt <= TARGET_HW_WATCH_LIMIT)
 253         return 1;
 254     }
 255   return -1;
 256 }
 257
 258 CORE_ADDR
 259 sparclite_stopped_data_address ()
 260 {
 261   CORE_ADDR dsr, dda1, dda2;
 262
 263   dsr = read_register (DSR_REGNUM);
 264   dda1 = read_register (DDA1_REGNUM);
 265   dda2 = read_register (DDA2_REGNUM);
 266
 267   if (dsr & 0x10)
 268     return dda1;
 269   else if (dsr & 0x20)
 270     return dda2;
 271   else
 272     return 0;
 273 }
 274 \f
 275 static serial_t
 276 open_tty (name)
 277      char *name;
 278 {
 279   serial_t desc;
 280
 281   desc = SERIAL_OPEN (name);
 282   if (!desc)
 283     perror_with_name (name);
 284
 285   if (baud_rate != -1)
 286     {
 287       if (SERIAL_SETBAUDRATE (desc, baud_rate))
 288         {
 289           SERIAL_CLOSE (desc);
 290           perror_with_name (name);
 291         }
 292     }
 293
 294   SERIAL_RAW (desc);
 295
 296   SERIAL_FLUSH_INPUT (desc);
 297
 298   return desc;
 299 }
 300
 301 /* Read a single character from the remote end, masking it down to 7 bits. */
 302
 303 static int
 304 readchar (desc, timeout)
 305      serial_t desc;
 306      int timeout;
 307 {
 308   int ch;
 309   char s[10];
 310
 311   ch = SERIAL_READCHAR (desc, timeout);
 312
 313   switch (ch)
 314     {
 315     case SERIAL_EOF:
 316       error ("SPARClite remote connection closed");
 317     case SERIAL_ERROR:
 318       perror_with_name ("SPARClite communication error");
 319     case SERIAL_TIMEOUT:
 320       error ("SPARClite remote timeout");
 321     default:
 322       if (remote_debug > 0)
 323         {
 324           sprintf (s, "[%02x]", ch & 0xff);
 325           puts_debug ("read -->", s, "<--");
 326         }
 327       return ch;
 328     }
 329 }
 330
 331 static void
 332 debug_serial_write (desc, buf, len)
 333      serial_t desc;
 334      char *buf;
 335      int len;
 336 {
 337   char s[10];
 338
 339   SERIAL_WRITE (desc, buf, len);
 340   if (remote_debug > 0)
 341     {
 342       while (len-- > 0)
 343         {
 344           sprintf (s, "[%02x]", *buf & 0xff);
 345           puts_debug ("Sent -->", s, "<--");
 346           buf++;
 347         }
 348     }
 349 }
 350
 351
 352 static int
 353 send_resp (desc, c)
 354      serial_t desc;
 355      char c;
 356 {
 357   debug_serial_write (desc, &c, 1);
 358   return readchar (desc, remote_timeout);
 359 }
 360
 361 static void
 362 close_tty (ignore)
 363      int ignore;
 364 {
 365   if (!remote_desc)
 366     return;
 367
 368   SERIAL_CLOSE (remote_desc);
 369
 370   remote_desc = NULL;
 371 }
 372
 373 #ifdef HAVE_SOCKETS
 374 static int
 375 recv_udp_buf (fd, buf, len, timeout)
 376      int fd, len;
 377      unsigned char *buf;
 378      int timeout;
 379 {
 380   int cc;
 381   fd_set readfds;
 382
 383   FD_ZERO (&readfds);
 384   FD_SET (fd, &readfds);
 385
 386   if (timeout >= 0)
 387     {
 388       struct timeval timebuf;
 389
 390       timebuf.tv_sec = timeout;
 391       timebuf.tv_usec = 0;
 392       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 393     }
 394   else
 395     cc = select (fd + 1, &readfds, 0, 0, 0);
 396
 397   if (cc == 0)
 398     return 0;
 399
 400   if (cc != 1)
 401     perror_with_name ("recv_udp_buf: Bad return value from select:");
 402
 403   cc = recv (fd, buf, len, 0);
 404
 405   if (cc < 0)
 406     perror_with_name ("Got an error from recv: ");
 407 }
 408
 409 static int
 410 send_udp_buf (fd, buf, len)
 411      int fd, len;
 412      unsigned char *buf;
 413 {
 414   int cc;
 415
 416   cc = send (fd, buf, len, 0);
 417
 418   if (cc == len)
 419     return;
 420
 421   if (cc < 0)
 422     perror_with_name ("Got an error from send: ");
 423
 424   error ("Short count in send: tried %d, sent %d\n", len, cc);
 425 }
 426 #endif /* HAVE_SOCKETS */
 427
 428 static void
 429 sparclite_open (name, from_tty)
 430      char *name;
 431      int from_tty;
 432 {
 433   struct cleanup *old_chain;
 434   int c;
 435   char *p;
 436
 437   if (!name)
 438     error ("You need to specify what device or hostname is associated with the SparcLite board.");
 439
 440   target_preopen (from_tty);
 441
 442   unpush_target (&sparclite_ops);
 443
 444   if (remote_target_name)
 445     free (remote_target_name);
 446
 447   remote_target_name = strsave (name);
 448
 449   /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
 450      mean either a serial port on a terminal server, or the IP address of a
 451      SPARClite demo board.  If there's no colon, then it pretty much has to be
 452      a local device (except for DOS... grrmble) */
 453
 454   p = strchr (name, ' ');
 455
 456   if (p)
 457     {
 458       *p++ = '\000';
 459       while ((*p != '\000') && isspace (*p))
 460         p++;
 461
 462       if (strncmp (name, "serial", strlen (name)) == 0)
 463         serial_flag = 1;
 464       else if (strncmp (name, "udp", strlen (name)) == 0)
 465         serial_flag = 0;
 466       else
 467         error ("Must specify either `serial' or `udp'.");
 468     }
 469   else
 470     {
 471       p = name;
 472
 473       if (!strchr (name, ':'))
 474         serial_flag = 1;        /* No colon is unambiguous (local device) */
 475       else
 476         error ("Usage: target sparclite serial /dev/ttyb\n\
 477 or: target sparclite udp host");
 478     }
 479
 480   if (serial_flag)
 481     {
 482       remote_desc = open_tty (p);
 483
 484       old_chain = make_cleanup ((make_cleanup_func) close_tty, 0);
 485
 486       c = send_resp (remote_desc, 0x00);
 487
 488       if (c != 0xaa)
 489         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 490                c);
 491
 492       c = send_resp (remote_desc, 0x55);
 493
 494       if (c != 0x55)
 495         error ("Sparclite appears to be ill.");
 496     }
 497   else
 498     {
 499 #ifdef HAVE_SOCKETS
 500       struct hostent *he;
 501       struct sockaddr_in sockaddr;
 502       unsigned char buffer[100];
 503       int cc;
 504
 505       /* Setup the socket.  Must be raw UDP. */
 506
 507       he = gethostbyname (p);
 508
 509       if (!he)
 510         error ("No such host %s.", p);
 511
 512       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 513
 514       old_chain = make_cleanup (close, udp_fd);
 515
 516       sockaddr.sin_family = PF_INET;
 517       sockaddr.sin_port = htons (7000);
 518       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 519
 520       if (connect (udp_fd, &sockaddr, sizeof (sockaddr)))
 521         perror_with_name ("Connect failed");
 522
 523       buffer[0] = 0x5;
 524       buffer[1] = 0;
 525
 526       send_udp_buf (udp_fd, buffer, 2);         /* Request version */
 527       cc = recv_udp_buf (udp_fd, buffer, sizeof (buffer), 5);   /* Get response */
 528       if (cc == 0)
 529         error ("SPARClite isn't responding.");
 530
 531       if (cc < 3)
 532         error ("SPARClite appears to be ill.");
 533 #else
 534       error ("UDP downloading is not supported for DOS hosts.");
 535 #endif /* HAVE_SOCKETS */
 536     }
 537
 538   printf_unfiltered ("[SPARClite appears to be alive]\n");
 539
 540   push_target (&sparclite_ops);
 541
 542   discard_cleanups (old_chain);
 543
 544   return;
 545 }
 546
 547 static void
 548 sparclite_close (quitting)
 549      int quitting;
 550 {
 551   if (serial_flag)
 552     close_tty (0);
 553 #ifdef HAVE_SOCKETS
 554   else if (udp_fd != -1)
 555     close (udp_fd);
 556 #endif
 557 }
 558
 559 #define LOAD_ADDRESS 0x40000000
 560
 561 static void
 562 download (target_name, args, from_tty, write_routine, start_routine)
 563      char *target_name;
 564      char *args;
 565      int from_tty;
 566      void (*write_routine) PARAMS ((bfd * from_bfd, asection * from_sec,
 567                              file_ptr from_addr, bfd_vma to_addr, int len));
 568      void (*start_routine) PARAMS ((bfd_vma entry));
 569 {
 570   struct cleanup *old_chain;
 571   asection *section;
 572   bfd *pbfd;
 573   bfd_vma entry;
 574   int i;
 575 #define WRITESIZE 1024
 576   char *filename;
 577   int quiet;
 578   int nostart;
 579
 580   quiet = 0;
 581   nostart = 0;
 582   filename = NULL;
 583
 584   while (*args != '\000')
 585     {
 586       char *arg;
 587
 588       while (isspace (*args))
 589         args++;
 590
 591       arg = args;
 592
 593       while ((*args != '\000') && !isspace (*args))
 594         args++;
 595
 596       if (*args != '\000')
 597         *args++ = '\000';
 598
 599       if (*arg != '-')
 600         filename = arg;
 601       else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
 602         quiet = 1;
 603       else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
 604         nostart = 1;
 605       else
 606         error ("unknown option `%s'", arg);
 607     }
 608
 609   if (!filename)
 610     filename = get_exec_file (1);
 611
 612   pbfd = bfd_openr (filename, gnutarget);
 613   if (pbfd == NULL)
 614     {
 615       perror_with_name (filename);
 616       return;
 617     }
 618   old_chain = make_cleanup ((make_cleanup_func) bfd_close, pbfd);
 619
 620   if (!bfd_check_format (pbfd, bfd_object))
 621     error ("\"%s\" is not an object file: %s", filename,
 622            bfd_errmsg (bfd_get_error ()));
 623
 624   for (section = pbfd->sections; section; section = section->next)
 625     {
 626       if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
 627         {
 628           bfd_vma section_address;
 629           bfd_size_type section_size;
 630           file_ptr fptr;
 631           const char *section_name;
 632
 633           section_name = bfd_get_section_name (pbfd, section);
 634
 635           section_address = bfd_get_section_vma (pbfd, section);
 636
 637           /* Adjust sections from a.out files, since they don't
 638              carry their addresses with.  */
 639           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 640             {
 641               if (strcmp (section_name, ".text") == 0)
 642                 section_address = bfd_get_start_address (pbfd);
 643               else if (strcmp (section_name, ".data") == 0)
 644                 {
 645                   /* Read the first 8 bytes of the data section.
 646                      There should be the string 'DaTa' followed by
 647                      a word containing the actual section address. */
 648                   struct data_marker
 649                     {
 650                       char signature[4];        /* 'DaTa' */
 651                       unsigned char sdata[4];   /* &sdata */
 652                     }
 653                   marker;
 654                   bfd_get_section_contents (pbfd, section, &marker, 0,
 655                                             sizeof (marker));
 656                   if (strncmp (marker.signature, "DaTa", 4) == 0)
 657                     {
 658                       if (TARGET_BYTE_ORDER == BIG_ENDIAN)
 659                         section_address = bfd_getb32 (marker.sdata);
 660                       else
 661                         section_address = bfd_getl32 (marker.sdata);
 662                     }
 663                 }
 664             }
 665
 666           section_size = bfd_get_section_size_before_reloc (section);
 667
 668           if (!quiet)
 669             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 670                              bfd_get_section_name (pbfd, section),
 671                              section_address,
 672                              section_size);
 673
 674           fptr = 0;
 675           while (section_size > 0)
 676             {
 677               int count;
 678               static char inds[] = "|/-\\";
 679               static int k = 0;
 680
 681               QUIT;
 682
 683               count = min (section_size, WRITESIZE);
 684
 685               write_routine (pbfd, section, fptr, section_address, count);
 686
 687               if (!quiet)
 688                 {
 689                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 690                   gdb_flush (gdb_stdout);
 691                 }
 692
 693               section_address += count;
 694               fptr += count;
 695               section_size -= count;
 696             }
 697         }
 698     }
 699
 700   if (!nostart)
 701     {
 702       entry = bfd_get_start_address (pbfd);
 703
 704       if (!quiet)
 705         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 706
 707       start_routine (entry);
 708     }
 709
 710   do_cleanups (old_chain);
 711 }
 712
 713 static void
 714 sparclite_serial_start (entry)
 715      bfd_vma entry;
 716 {
 717   char buffer[5];
 718   int i;
 719
 720   buffer[0] = 0x03;
 721   store_unsigned_integer (buffer + 1, 4, entry);
 722
 723   debug_serial_write (remote_desc, buffer, 1 + 4);
 724   i = readchar (remote_desc, remote_timeout);
 725   if (i != 0x55)
 726     error ("Can't start SparcLite.  Error code %d\n", i);
 727 }
 728
 729 static void
 730 sparclite_serial_write (from_bfd, from_sec, from_addr, to_addr, len)
 731      bfd *from_bfd;
 732      asection *from_sec;
 733      file_ptr from_addr;
 734      bfd_vma to_addr;
 735      int len;
 736 {
 737   char buffer[4 + 4 + WRITESIZE];       /* addr + len + data */
 738   unsigned char checksum;
 739   int i;
 740
 741   store_unsigned_integer (buffer, 4, to_addr);  /* Address */
 742   store_unsigned_integer (buffer + 4, 4, len);  /* Length */
 743
 744   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 745
 746   checksum = 0;
 747   for (i = 0; i < len; i++)
 748     checksum += buffer[8 + i];
 749
 750   i = send_resp (remote_desc, 0x01);
 751
 752   if (i != 0x5a)
 753     error ("Bad response from load command (0x%x)", i);
 754
 755   debug_serial_write (remote_desc, buffer, 4 + 4 + len);
 756   i = readchar (remote_desc, remote_timeout);
 757
 758   if (i != checksum)
 759     error ("Bad checksum from load command (0x%x)", i);
 760 }
 761
 762 #ifdef HAVE_SOCKETS
 763
 764 static unsigned short
 765 calc_checksum (buffer, count)
 766      unsigned char *buffer;
 767      int count;
 768 {
 769   unsigned short checksum;
 770
 771   checksum = 0;
 772   for (; count > 0; count -= 2, buffer += 2)
 773     checksum += (*buffer << 8) | *(buffer + 1);
 774
 775   if (count != 0)
 776     checksum += *buffer << 8;
 777
 778   return checksum;
 779 }
 780
 781 static void
 782 sparclite_udp_start (entry)
 783      bfd_vma entry;
 784 {
 785   unsigned char buffer[6];
 786   int i;
 787
 788   buffer[0] = 0x3;
 789   buffer[1] = 0;
 790   buffer[2] = entry >> 24;
 791   buffer[3] = entry >> 16;
 792   buffer[4] = entry >> 8;
 793   buffer[5] = entry;
 794
 795   send_udp_buf (udp_fd, buffer, 6);     /* Send start addr */
 796   i = recv_udp_buf (udp_fd, buffer, sizeof (buffer), -1);       /* Get response */
 797
 798   if (i < 1 || buffer[0] != 0x55)
 799     error ("Failed to take start address.");
 800 }
 801
 802 static void
 803 sparclite_udp_write (from_bfd, from_sec, from_addr, to_addr, len)
 804      bfd *from_bfd;
 805      asection *from_sec;
 806      file_ptr from_addr;
 807      bfd_vma to_addr;
 808      int len;
 809 {
 810   unsigned char buffer[2000];
 811   unsigned short checksum;
 812   static int pkt_num = 0;
 813   static unsigned long old_addr = -1;
 814   int i;
 815
 816   while (1)
 817     {
 818       if (to_addr != old_addr)
 819         {
 820           buffer[0] = 0x1;      /* Load command */
 821           buffer[1] = 0x1;      /* Loading address */
 822           buffer[2] = to_addr >> 24;
 823           buffer[3] = to_addr >> 16;
 824           buffer[4] = to_addr >> 8;
 825           buffer[5] = to_addr;
 826
 827           checksum = 0;
 828           for (i = 0; i < 6; i++)
 829             checksum += buffer[i];
 830           checksum &= 0xff;
 831
 832           send_udp_buf (udp_fd, buffer, 6);
 833           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 834
 835           if (i < 1)
 836             error ("Got back short checksum for load addr.");
 837
 838           if (checksum != buffer[0])
 839             error ("Got back bad checksum for load addr.");
 840
 841           pkt_num = 0;          /* Load addr resets packet seq # */
 842           old_addr = to_addr;
 843         }
 844
 845       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 846                                 len);
 847
 848       checksum = calc_checksum (buffer + 6, len);
 849
 850       buffer[0] = 0x1;          /* Load command */
 851       buffer[1] = 0x2;          /* Loading data */
 852       buffer[2] = pkt_num >> 8;
 853       buffer[3] = pkt_num;
 854       buffer[4] = checksum >> 8;
 855       buffer[5] = checksum;
 856
 857       send_udp_buf (udp_fd, buffer, len + 6);
 858       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 859
 860       if (i == 0)
 861         {
 862           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 863           continue;
 864         }
 865
 866       if (buffer[0] != 0xff)
 867         error ("Got back bad response for load data.");
 868
 869       old_addr += len;
 870       pkt_num++;
 871
 872       return;
 873     }
 874 }
 875
 876 #endif /* HAVE_SOCKETS */
 877
 878 static void
 879 sparclite_download (filename, from_tty)
 880      char *filename;
 881      int from_tty;
 882 {
 883   if (!serial_flag)
 884 #ifdef HAVE_SOCKETS
 885     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 886               sparclite_udp_start);
 887 #else
 888     abort ();                   /* sparclite_open should prevent this! */
 889 #endif
 890   else
 891     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 892               sparclite_serial_start);
 893 }
 894 \f
 895 /* Set up the sparclite target vector.  */
 896
 897 static void
 898 init_sparclite_ops (void)
 899 {
 900   sparclite_ops.to_shortname = "sparclite";
 901   sparclite_ops.to_longname = "SPARClite download target";
 902   sparclite_ops.to_doc = "Download to a remote SPARClite target board via serial of UDP.\n\
 903 Specify the device it is connected to (e.g. /dev/ttya).";
 904   sparclite_ops.to_open = sparclite_open;
 905   sparclite_ops.to_close = sparclite_close;
 906   sparclite_ops.to_load = sparclite_download;
 907   sparclite_ops.to_stratum = download_stratum;
 908   sparclite_ops.to_magic = OPS_MAGIC;
 909 }
 910
 911 void
 912 _initialize_sparcl_tdep ()
 913 {
 914   init_sparclite_ops ();
 915   add_target (&sparclite_ops);
 916 }