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 <sys/socket.h>
  32 #include <netinet/in.h>
  33 #include <netdb.h>
  34 #endif
  35
  36 static struct target_ops sparclite_ops;
  37
  38 static char *remote_target_name = NULL;
  39 static serial_t remote_desc = NULL;
  40 static int serial_flag;
  41 #ifdef HAVE_SOCKETS
  42 static int udp_fd = -1;
  43 #endif
  44
  45 static serial_t open_tty PARAMS ((char *name));
  46 static int send_resp PARAMS ((serial_t desc, char c));
  47 static void close_tty PARAMS ((int ignore));
  48 #ifdef HAVE_SOCKETS
  49 static int recv_udp_buf PARAMS ((int fd, unsigned char *buf, int len, int timeout));
  50 static int send_udp_buf PARAMS ((int fd, unsigned char *buf, int len));
  51 #endif
  52 static void sparclite_open PARAMS ((char *name, int from_tty));
  53 static void sparclite_close PARAMS ((int quitting));
  54 static void download PARAMS ((char *target_name, char *args, int from_tty,
  55                               void (*write_routine) (bfd * from_bfd,
  56                                                      asection * from_sec,
  57                                                      file_ptr from_addr,
  58                                                   bfd_vma to_addr, int len),
  59                               void (*start_routine) (bfd_vma entry)));
  60 static void sparclite_serial_start PARAMS ((bfd_vma entry));
  61 static void sparclite_serial_write PARAMS ((bfd * from_bfd, asection * from_sec,
  62                                             file_ptr from_addr,
  63                                             bfd_vma to_addr, int len));
  64 #ifdef HAVE_SOCKETS
  65 static unsigned short calc_checksum PARAMS ((unsigned char *buffer,
  66                                              int count));
  67 static void sparclite_udp_start PARAMS ((bfd_vma entry));
  68 static void sparclite_udp_write PARAMS ((bfd * from_bfd, asection * from_sec,
  69                                          file_ptr from_addr, bfd_vma to_addr,
  70                                          int len));
  71 #endif
  72 static void sparclite_download PARAMS ((char *filename, int from_tty));
  73
  74 #define DDA2_SUP_ASI            0xb000000
  75 #define DDA1_SUP_ASI            0xb0000
  76
  77 #define DDA2_ASI_MASK           0xff000000
  78 #define DDA1_ASI_MASK           0xff0000
  79 #define DIA2_SUP_MODE           0x8000
  80 #define DIA1_SUP_MODE           0x4000
  81 #define DDA2_ENABLE             0x100
  82 #define DDA1_ENABLE             0x80
  83 #define DIA2_ENABLE             0x40
  84 #define DIA1_ENABLE             0x20
  85 #define DSINGLE_STEP            0x10    /* not used */
  86 #define DDV_TYPE_MASK           0xc
  87 #define DDV_TYPE_LOAD           0x0
  88 #define DDV_TYPE_STORE          0x4
  89 #define DDV_TYPE_ACCESS         0x8
  90 #define DDV_TYPE_ALWAYS         0xc
  91 #define DDV_COND                0x2
  92 #define DDV_MASK                0x1
  93
  94 int
  95 sparclite_insert_watchpoint (addr, len, type)
  96      CORE_ADDR addr;
  97      int len;
  98      int type;
  99 {
 100   CORE_ADDR dcr;
 101
 102   dcr = read_register (DCR_REGNUM);
 103
 104   if (!(dcr & DDA1_ENABLE))
 105     {
 106       write_register (DDA1_REGNUM, addr);
 107       dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK);
 108       dcr |= (DDA1_SUP_ASI | DDA1_ENABLE);
 109       if (type == 1)
 110         {
 111           write_register (DDV1_REGNUM, 0);
 112           write_register (DDV2_REGNUM, 0xffffffff);
 113           dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK));
 114         }
 115       else if (type == 0)
 116         {
 117           write_register (DDV1_REGNUM, 0);
 118           write_register (DDV2_REGNUM, 0xffffffff);
 119           dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK));
 120         }
 121       else
 122         {
 123           write_register (DDV1_REGNUM, 0);
 124           write_register (DDV2_REGNUM, 0xffffffff);
 125           dcr |= (DDV_TYPE_ACCESS);
 126         }
 127       write_register (DCR_REGNUM, dcr);
 128     }
 129   else if (!(dcr & DDA2_ENABLE))
 130     {
 131       write_register (DDA2_REGNUM, addr);
 132       dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK);
 133       dcr |= (DDA2_SUP_ASI | DDA2_ENABLE);
 134       if (type == 1)
 135         {
 136           write_register (DDV1_REGNUM, 0);
 137           write_register (DDV2_REGNUM, 0xffffffff);
 138           dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK);
 139         }
 140       else if (type == 0)
 141         {
 142           write_register (DDV1_REGNUM, 0);
 143           write_register (DDV2_REGNUM, 0xffffffff);
 144           dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK);
 145         }
 146       else
 147         {
 148           write_register (DDV1_REGNUM, 0);
 149           write_register (DDV2_REGNUM, 0xffffffff);
 150           dcr |= (DDV_TYPE_ACCESS);
 151         }
 152       write_register (DCR_REGNUM, dcr);
 153     }
 154   else
 155     return -1;
 156
 157   return 0;
 158 }
 159
 160 int
 161 sparclite_remove_watchpoint (addr, len, type)
 162      CORE_ADDR addr;
 163      int len;
 164      int type;
 165 {
 166   CORE_ADDR dcr, dda1, dda2;
 167
 168   dcr = read_register (DCR_REGNUM);
 169   dda1 = read_register (DDA1_REGNUM);
 170   dda2 = read_register (DDA2_REGNUM);
 171
 172   if ((dcr & DDA1_ENABLE) && addr == dda1)
 173     write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE));
 174   else if ((dcr & DDA2_ENABLE) && addr == dda2)
 175     write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE));
 176   else
 177     return -1;
 178
 179   return 0;
 180 }
 181
 182 int
 183 sparclite_insert_hw_breakpoint (addr, len)
 184      CORE_ADDR addr;
 185      int len;
 186 {
 187   CORE_ADDR dcr;
 188
 189   dcr = read_register (DCR_REGNUM);
 190
 191   if (!(dcr & DIA1_ENABLE))
 192     {
 193       write_register (DIA1_REGNUM, addr);
 194       write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE));
 195     }
 196   else if (!(dcr & DIA2_ENABLE))
 197     {
 198       write_register (DIA2_REGNUM, addr);
 199       write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE));
 200     }
 201   else
 202     return -1;
 203
 204   return 0;
 205 }
 206
 207 int
 208 sparclite_remove_hw_breakpoint (addr, shadow)
 209      CORE_ADDR addr;
 210      int shadow;
 211 {
 212   CORE_ADDR dcr, dia1, dia2;
 213
 214   dcr = read_register (DCR_REGNUM);
 215   dia1 = read_register (DIA1_REGNUM);
 216   dia2 = read_register (DIA2_REGNUM);
 217
 218   if ((dcr & DIA1_ENABLE) && addr == dia1)
 219     write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE));
 220   else if ((dcr & DIA2_ENABLE) && addr == dia2)
 221     write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE));
 222   else
 223     return -1;
 224
 225   return 0;
 226 }
 227
 228 int
 229 sparclite_check_watch_resources (type, cnt, ot)
 230      int type;
 231      int cnt;
 232      int ot;
 233 {
 234   /* Watchpoints not supported on simulator.  */
 235   if (strcmp (target_shortname, "sim") == 0)
 236     return 0;
 237
 238   if (type == bp_hardware_breakpoint)
 239     {
 240       if (TARGET_HW_BREAK_LIMIT == 0)
 241         return 0;
 242       else if (cnt <= TARGET_HW_BREAK_LIMIT)
 243         return 1;
 244     }
 245   else
 246     {
 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     }
 254   return -1;
 255 }
 256
 257 CORE_ADDR
 258 sparclite_stopped_data_address ()
 259 {
 260   CORE_ADDR dsr, dda1, dda2;
 261
 262   dsr = read_register (DSR_REGNUM);
 263   dda1 = read_register (DDA1_REGNUM);
 264   dda2 = read_register (DDA2_REGNUM);
 265
 266   if (dsr & 0x10)
 267     return dda1;
 268   else if (dsr & 0x20)
 269     return dda2;
 270   else
 271     return 0;
 272 }
 273 \f
 274 static serial_t
 275 open_tty (name)
 276      char *name;
 277 {
 278   serial_t desc;
 279
 280   desc = SERIAL_OPEN (name);
 281   if (!desc)
 282     perror_with_name (name);
 283
 284   if (baud_rate != -1)
 285     {
 286       if (SERIAL_SETBAUDRATE (desc, baud_rate))
 287         {
 288           SERIAL_CLOSE (desc);
 289           perror_with_name (name);
 290         }
 291     }
 292
 293   SERIAL_RAW (desc);
 294
 295   SERIAL_FLUSH_INPUT (desc);
 296
 297   return desc;
 298 }
 299
 300 /* Read a single character from the remote end, masking it down to 7 bits. */
 301
 302 static int
 303 readchar (desc, timeout)
 304      serial_t desc;
 305      int timeout;
 306 {
 307   int ch;
 308   char s[10];
 309
 310   ch = SERIAL_READCHAR (desc, timeout);
 311
 312   switch (ch)
 313     {
 314     case SERIAL_EOF:
 315       error ("SPARClite remote connection closed");
 316     case SERIAL_ERROR:
 317       perror_with_name ("SPARClite communication error");
 318     case SERIAL_TIMEOUT:
 319       error ("SPARClite remote timeout");
 320     default:
 321       if (remote_debug > 0)
 322         {
 323           sprintf (s, "[%02x]", ch & 0xff);
 324           puts_debug ("read -->", s, "<--");
 325         }
 326       return ch;
 327     }
 328 }
 329
 330 static void
 331 debug_serial_write (desc, buf, len)
 332      serial_t desc;
 333      char *buf;
 334      int len;
 335 {
 336   char s[10];
 337
 338   SERIAL_WRITE (desc, buf, len);
 339   if (remote_debug > 0)
 340     {
 341       while (len-- > 0)
 342         {
 343           sprintf (s, "[%02x]", *buf & 0xff);
 344           puts_debug ("Sent -->", s, "<--");
 345           buf++;
 346         }
 347     }
 348 }
 349
 350
 351 static int
 352 send_resp (desc, c)
 353      serial_t desc;
 354      char c;
 355 {
 356   debug_serial_write (desc, &c, 1);
 357   return readchar (desc, remote_timeout);
 358 }
 359
 360 static void
 361 close_tty (ignore)
 362      int ignore;
 363 {
 364   if (!remote_desc)
 365     return;
 366
 367   SERIAL_CLOSE (remote_desc);
 368
 369   remote_desc = NULL;
 370 }
 371
 372 #ifdef HAVE_SOCKETS
 373 static int
 374 recv_udp_buf (fd, buf, len, timeout)
 375      int fd, len;
 376      unsigned char *buf;
 377      int timeout;
 378 {
 379   int cc;
 380   fd_set readfds;
 381
 382   FD_ZERO (&readfds);
 383   FD_SET (fd, &readfds);
 384
 385   if (timeout >= 0)
 386     {
 387       struct timeval timebuf;
 388
 389       timebuf.tv_sec = timeout;
 390       timebuf.tv_usec = 0;
 391       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 392     }
 393   else
 394     cc = select (fd + 1, &readfds, 0, 0, 0);
 395
 396   if (cc == 0)
 397     return 0;
 398
 399   if (cc != 1)
 400     perror_with_name ("recv_udp_buf: Bad return value from select:");
 401
 402   cc = recv (fd, buf, len, 0);
 403
 404   if (cc < 0)
 405     perror_with_name ("Got an error from recv: ");
 406 }
 407
 408 static int
 409 send_udp_buf (fd, buf, len)
 410      int fd, len;
 411      unsigned char *buf;
 412 {
 413   int cc;
 414
 415   cc = send (fd, buf, len, 0);
 416
 417   if (cc == len)
 418     return;
 419
 420   if (cc < 0)
 421     perror_with_name ("Got an error from send: ");
 422
 423   error ("Short count in send: tried %d, sent %d\n", len, cc);
 424 }
 425 #endif /* HAVE_SOCKETS */
 426
 427 static void
 428 sparclite_open (name, from_tty)
 429      char *name;
 430      int from_tty;
 431 {
 432   struct cleanup *old_chain;
 433   int c;
 434   char *p;
 435
 436   if (!name)
 437     error ("You need to specify what device or hostname is associated with the SparcLite board.");
 438
 439   target_preopen (from_tty);
 440
 441   unpush_target (&sparclite_ops);
 442
 443   if (remote_target_name)
 444     free (remote_target_name);
 445
 446   remote_target_name = strsave (name);
 447
 448   /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
 449      mean either a serial port on a terminal server, or the IP address of a
 450      SPARClite demo board.  If there's no colon, then it pretty much has to be
 451      a local device (except for DOS... grrmble) */
 452
 453   p = strchr (name, ' ');
 454
 455   if (p)
 456     {
 457       *p++ = '\000';
 458       while ((*p != '\000') && isspace (*p))
 459         p++;
 460
 461       if (strncmp (name, "serial", strlen (name)) == 0)
 462         serial_flag = 1;
 463       else if (strncmp (name, "udp", strlen (name)) == 0)
 464         serial_flag = 0;
 465       else
 466         error ("Must specify either `serial' or `udp'.");
 467     }
 468   else
 469     {
 470       p = name;
 471
 472       if (!strchr (name, ':'))
 473         serial_flag = 1;        /* No colon is unambiguous (local device) */
 474       else
 475         error ("Usage: target sparclite serial /dev/ttyb\n\
 476 or: target sparclite udp host");
 477     }
 478
 479   if (serial_flag)
 480     {
 481       remote_desc = open_tty (p);
 482
 483       old_chain = make_cleanup ((make_cleanup_func) close_tty, 0);
 484
 485       c = send_resp (remote_desc, 0x00);
 486
 487       if (c != 0xaa)
 488         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 489                c);
 490
 491       c = send_resp (remote_desc, 0x55);
 492
 493       if (c != 0x55)
 494         error ("Sparclite appears to be ill.");
 495     }
 496   else
 497     {
 498 #ifdef HAVE_SOCKETS
 499       struct hostent *he;
 500       struct sockaddr_in sockaddr;
 501       unsigned char buffer[100];
 502       int cc;
 503
 504       /* Setup the socket.  Must be raw UDP. */
 505
 506       he = gethostbyname (p);
 507
 508       if (!he)
 509         error ("No such host %s.", p);
 510
 511       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 512
 513       old_chain = make_cleanup (close, udp_fd);
 514
 515       sockaddr.sin_family = PF_INET;
 516       sockaddr.sin_port = htons (7000);
 517       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 518
 519       if (connect (udp_fd, &sockaddr, sizeof (sockaddr)))
 520         perror_with_name ("Connect failed");
 521
 522       buffer[0] = 0x5;
 523       buffer[1] = 0;
 524
 525       send_udp_buf (udp_fd, buffer, 2);         /* Request version */
 526       cc = recv_udp_buf (udp_fd, buffer, sizeof (buffer), 5);   /* Get response */
 527       if (cc == 0)
 528         error ("SPARClite isn't responding.");
 529
 530       if (cc < 3)
 531         error ("SPARClite appears to be ill.");
 532 #else
 533       error ("UDP downloading is not supported for DOS hosts.");
 534 #endif /* HAVE_SOCKETS */
 535     }
 536
 537   printf_unfiltered ("[SPARClite appears to be alive]\n");
 538
 539   push_target (&sparclite_ops);
 540
 541   discard_cleanups (old_chain);
 542
 543   return;
 544 }
 545
 546 static void
 547 sparclite_close (quitting)
 548      int quitting;
 549 {
 550   if (serial_flag)
 551     close_tty (0);
 552 #ifdef HAVE_SOCKETS
 553   else if (udp_fd != -1)
 554     close (udp_fd);
 555 #endif
 556 }
 557
 558 #define LOAD_ADDRESS 0x40000000
 559
 560 static void
 561 download (target_name, args, from_tty, write_routine, start_routine)
 562      char *target_name;
 563      char *args;
 564      int from_tty;
 565      void (*write_routine) PARAMS ((bfd * from_bfd, asection * from_sec,
 566                              file_ptr from_addr, bfd_vma to_addr, int len));
 567      void (*start_routine) PARAMS ((bfd_vma entry));
 568 {
 569   struct cleanup *old_chain;
 570   asection *section;
 571   bfd *pbfd;
 572   bfd_vma entry;
 573   int i;
 574 #define WRITESIZE 1024
 575   char *filename;
 576   int quiet;
 577   int nostart;
 578
 579   quiet = 0;
 580   nostart = 0;
 581   filename = NULL;
 582
 583   while (*args != '\000')
 584     {
 585       char *arg;
 586
 587       while (isspace (*args))
 588         args++;
 589
 590       arg = args;
 591
 592       while ((*args != '\000') && !isspace (*args))
 593         args++;
 594
 595       if (*args != '\000')
 596         *args++ = '\000';
 597
 598       if (*arg != '-')
 599         filename = arg;
 600       else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
 601         quiet = 1;
 602       else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
 603         nostart = 1;
 604       else
 605         error ("unknown option `%s'", arg);
 606     }
 607
 608   if (!filename)
 609     filename = get_exec_file (1);
 610
 611   pbfd = bfd_openr (filename, gnutarget);
 612   if (pbfd == NULL)
 613     {
 614       perror_with_name (filename);
 615       return;
 616     }
 617   old_chain = make_cleanup ((make_cleanup_func) bfd_close, pbfd);
 618
 619   if (!bfd_check_format (pbfd, bfd_object))
 620     error ("\"%s\" is not an object file: %s", filename,
 621            bfd_errmsg (bfd_get_error ()));
 622
 623   for (section = pbfd->sections; section; section = section->next)
 624     {
 625       if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
 626         {
 627           bfd_vma section_address;
 628           bfd_size_type section_size;
 629           file_ptr fptr;
 630           const char *section_name;
 631
 632           section_name = bfd_get_section_name (pbfd, section);
 633
 634           section_address = bfd_get_section_vma (pbfd, section);
 635
 636           /* Adjust sections from a.out files, since they don't
 637              carry their addresses with.  */
 638           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 639             {
 640               if (strcmp (section_name, ".text") == 0)
 641                 section_address = bfd_get_start_address (pbfd);
 642               else if (strcmp (section_name, ".data") == 0)
 643                 {
 644                   /* Read the first 8 bytes of the data section.
 645                      There should be the string 'DaTa' followed by
 646                      a word containing the actual section address. */
 647                   struct data_marker
 648                     {
 649                       char signature[4];        /* 'DaTa' */
 650                       unsigned char sdata[4];   /* &sdata */
 651                     }
 652                   marker;
 653                   bfd_get_section_contents (pbfd, section, &marker, 0,
 654                                             sizeof (marker));
 655                   if (strncmp (marker.signature, "DaTa", 4) == 0)
 656                     {
 657                       if (TARGET_BYTE_ORDER == BIG_ENDIAN)
 658                         section_address = bfd_getb32 (marker.sdata);
 659                       else
 660                         section_address = bfd_getl32 (marker.sdata);
 661                     }
 662                 }
 663             }
 664
 665           section_size = bfd_get_section_size_before_reloc (section);
 666
 667           if (!quiet)
 668             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 669                              bfd_get_section_name (pbfd, section),
 670                              section_address,
 671                              section_size);
 672
 673           fptr = 0;
 674           while (section_size > 0)
 675             {
 676               int count;
 677               static char inds[] = "|/-\\";
 678               static int k = 0;
 679
 680               QUIT;
 681
 682               count = min (section_size, WRITESIZE);
 683
 684               write_routine (pbfd, section, fptr, section_address, count);
 685
 686               if (!quiet)
 687                 {
 688                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 689                   gdb_flush (gdb_stdout);
 690                 }
 691
 692               section_address += count;
 693               fptr += count;
 694               section_size -= count;
 695             }
 696         }
 697     }
 698
 699   if (!nostart)
 700     {
 701       entry = bfd_get_start_address (pbfd);
 702
 703       if (!quiet)
 704         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 705
 706       start_routine (entry);
 707     }
 708
 709   do_cleanups (old_chain);
 710 }
 711
 712 static void
 713 sparclite_serial_start (entry)
 714      bfd_vma entry;
 715 {
 716   char buffer[5];
 717   int i;
 718
 719   buffer[0] = 0x03;
 720   store_unsigned_integer (buffer + 1, 4, entry);
 721
 722   debug_serial_write (remote_desc, buffer, 1 + 4);
 723   i = readchar (remote_desc, remote_timeout);
 724   if (i != 0x55)
 725     error ("Can't start SparcLite.  Error code %d\n", i);
 726 }
 727
 728 static void
 729 sparclite_serial_write (from_bfd, from_sec, from_addr, to_addr, len)
 730      bfd *from_bfd;
 731      asection *from_sec;
 732      file_ptr from_addr;
 733      bfd_vma to_addr;
 734      int len;
 735 {
 736   char buffer[4 + 4 + WRITESIZE];       /* addr + len + data */
 737   unsigned char checksum;
 738   int i;
 739
 740   store_unsigned_integer (buffer, 4, to_addr);  /* Address */
 741   store_unsigned_integer (buffer + 4, 4, len);  /* Length */
 742
 743   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 744
 745   checksum = 0;
 746   for (i = 0; i < len; i++)
 747     checksum += buffer[8 + i];
 748
 749   i = send_resp (remote_desc, 0x01);
 750
 751   if (i != 0x5a)
 752     error ("Bad response from load command (0x%x)", i);
 753
 754   debug_serial_write (remote_desc, buffer, 4 + 4 + len);
 755   i = readchar (remote_desc, remote_timeout);
 756
 757   if (i != checksum)
 758     error ("Bad checksum from load command (0x%x)", i);
 759 }
 760
 761 #ifdef HAVE_SOCKETS
 762
 763 static unsigned short
 764 calc_checksum (buffer, count)
 765      unsigned char *buffer;
 766      int count;
 767 {
 768   unsigned short checksum;
 769
 770   checksum = 0;
 771   for (; count > 0; count -= 2, buffer += 2)
 772     checksum += (*buffer << 8) | *(buffer + 1);
 773
 774   if (count != 0)
 775     checksum += *buffer << 8;
 776
 777   return checksum;
 778 }
 779
 780 static void
 781 sparclite_udp_start (entry)
 782      bfd_vma entry;
 783 {
 784   unsigned char buffer[6];
 785   int i;
 786
 787   buffer[0] = 0x3;
 788   buffer[1] = 0;
 789   buffer[2] = entry >> 24;
 790   buffer[3] = entry >> 16;
 791   buffer[4] = entry >> 8;
 792   buffer[5] = entry;
 793
 794   send_udp_buf (udp_fd, buffer, 6);     /* Send start addr */
 795   i = recv_udp_buf (udp_fd, buffer, sizeof (buffer), -1);       /* Get response */
 796
 797   if (i < 1 || buffer[0] != 0x55)
 798     error ("Failed to take start address.");
 799 }
 800
 801 static void
 802 sparclite_udp_write (from_bfd, from_sec, from_addr, to_addr, len)
 803      bfd *from_bfd;
 804      asection *from_sec;
 805      file_ptr from_addr;
 806      bfd_vma to_addr;
 807      int len;
 808 {
 809   unsigned char buffer[2000];
 810   unsigned short checksum;
 811   static int pkt_num = 0;
 812   static unsigned long old_addr = -1;
 813   int i;
 814
 815   while (1)
 816     {
 817       if (to_addr != old_addr)
 818         {
 819           buffer[0] = 0x1;      /* Load command */
 820           buffer[1] = 0x1;      /* Loading address */
 821           buffer[2] = to_addr >> 24;
 822           buffer[3] = to_addr >> 16;
 823           buffer[4] = to_addr >> 8;
 824           buffer[5] = to_addr;
 825
 826           checksum = 0;
 827           for (i = 0; i < 6; i++)
 828             checksum += buffer[i];
 829           checksum &= 0xff;
 830
 831           send_udp_buf (udp_fd, buffer, 6);
 832           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 833
 834           if (i < 1)
 835             error ("Got back short checksum for load addr.");
 836
 837           if (checksum != buffer[0])
 838             error ("Got back bad checksum for load addr.");
 839
 840           pkt_num = 0;          /* Load addr resets packet seq # */
 841           old_addr = to_addr;
 842         }
 843
 844       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 845                                 len);
 846
 847       checksum = calc_checksum (buffer + 6, len);
 848
 849       buffer[0] = 0x1;          /* Load command */
 850       buffer[1] = 0x2;          /* Loading data */
 851       buffer[2] = pkt_num >> 8;
 852       buffer[3] = pkt_num;
 853       buffer[4] = checksum >> 8;
 854       buffer[5] = checksum;
 855
 856       send_udp_buf (udp_fd, buffer, len + 6);
 857       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 858
 859       if (i == 0)
 860         {
 861           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 862           continue;
 863         }
 864
 865       if (buffer[0] != 0xff)
 866         error ("Got back bad response for load data.");
 867
 868       old_addr += len;
 869       pkt_num++;
 870
 871       return;
 872     }
 873 }
 874
 875 #endif /* HAVE_SOCKETS */
 876
 877 static void
 878 sparclite_download (filename, from_tty)
 879      char *filename;
 880      int from_tty;
 881 {
 882   if (!serial_flag)
 883 #ifdef HAVE_SOCKETS
 884     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 885               sparclite_udp_start);
 886 #else
 887     abort ();                   /* sparclite_open should prevent this! */
 888 #endif
 889   else
 890     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 891               sparclite_serial_start);
 892 }
 893 \f
 894 /* Set up the sparclite target vector.  */
 895
 896 static void
 897 init_sparclite_ops (void)
 898 {
 899   sparclite_ops.to_shortname = "sparclite";
 900   sparclite_ops.to_longname = "SPARClite download target";
 901   sparclite_ops.to_doc = "Download to a remote SPARClite target board via serial of UDP.\n\
 902 Specify the device it is connected to (e.g. /dev/ttya).";
 903   sparclite_ops.to_open = sparclite_open;
 904   sparclite_ops.to_close = sparclite_close;
 905   sparclite_ops.to_load = sparclite_download;
 906   sparclite_ops.to_stratum = download_stratum;
 907   sparclite_ops.to_magic = OPS_MAGIC;
 908 }
 909
 910 void
 911 _initialize_sparcl_tdep ()
 912 {
 913   init_sparclite_ops ();
 914   add_target (&sparclite_ops);
 915 }