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
 306   ch = SERIAL_READCHAR (desc, timeout);
 307
 308   switch (ch)
 309     {
 310     case SERIAL_EOF:
 311       error ("SPARClite remote connection closed");
 312     case SERIAL_ERROR:
 313       perror_with_name ("SPARClite communication error");
 314     case SERIAL_TIMEOUT:
 315       error ("SPARClite remote timeout");
 316     default:
 317       return ch;
 318     }
 319 }
 320
 321 static int
 322 send_resp (desc, c)
 323      serial_t desc;
 324      char c;
 325 {
 326   SERIAL_WRITE (desc, &c, 1);
 327   return readchar (desc, 2);
 328 }
 329
 330 static void
 331 close_tty (ignore)
 332      int ignore;
 333 {
 334   if (!remote_desc)
 335     return;
 336
 337   SERIAL_CLOSE (remote_desc);
 338
 339   remote_desc = NULL;
 340 }
 341
 342 #ifdef HAVE_SOCKETS
 343 static int
 344 recv_udp_buf (fd, buf, len, timeout)
 345      int fd, len;
 346      unsigned char *buf;
 347      int timeout;
 348 {
 349   int cc;
 350   fd_set readfds;
 351
 352   FD_ZERO (&readfds);
 353   FD_SET (fd, &readfds);
 354
 355   if (timeout >= 0)
 356     {
 357       struct timeval timebuf;
 358
 359       timebuf.tv_sec = timeout;
 360       timebuf.tv_usec = 0;
 361       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 362     }
 363   else
 364     cc = select (fd + 1, &readfds, 0, 0, 0);
 365
 366   if (cc == 0)
 367     return 0;
 368
 369   if (cc != 1)
 370     perror_with_name ("recv_udp_buf: Bad return value from select:");
 371
 372   cc = recv (fd, buf, len, 0);
 373
 374   if (cc < 0)
 375     perror_with_name ("Got an error from recv: ");
 376 }
 377
 378 static int
 379 send_udp_buf (fd, buf, len)
 380      int fd, len;
 381      unsigned char *buf;
 382 {
 383   int cc;
 384
 385   cc = send (fd, buf, len, 0);
 386
 387   if (cc == len)
 388     return;
 389
 390   if (cc < 0)
 391     perror_with_name ("Got an error from send: ");
 392
 393   error ("Short count in send: tried %d, sent %d\n", len, cc);
 394 }
 395 #endif /* HAVE_SOCKETS */
 396
 397 static void
 398 sparclite_open (name, from_tty)
 399      char *name;
 400      int from_tty;
 401 {
 402   struct cleanup *old_chain;
 403   int c;
 404   char *p;
 405
 406   if (!name)
 407     error ("You need to specify what device or hostname is associated with the SparcLite board.");
 408
 409   target_preopen (from_tty);
 410
 411   unpush_target (&sparclite_ops);
 412
 413   if (remote_target_name)
 414     free (remote_target_name);
 415
 416   remote_target_name = strsave (name);
 417
 418   /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
 419      mean either a serial port on a terminal server, or the IP address of a
 420      SPARClite demo board.  If there's no colon, then it pretty much has to be
 421      a local device (except for DOS... grrmble) */
 422
 423   p = strchr (name, ' ');
 424
 425   if (p)
 426     {
 427       *p++ = '\000';
 428       while ((*p != '\000') && isspace (*p)) p++;
 429
 430       if (strncmp (name, "serial", strlen (name)) == 0)
 431         serial_flag = 1;
 432       else if (strncmp (name, "udp", strlen (name)) == 0)
 433         serial_flag = 0;
 434       else
 435         error ("Must specify either `serial' or `udp'.");
 436     }
 437   else
 438     {
 439       p = name;
 440
 441       if (!strchr (name, ':'))
 442         serial_flag = 1;        /* No colon is unambiguous (local device) */
 443       else
 444         error ("Usage: target sparclite serial /dev/ttyb\n\
 445 or: target sparclite udp host");
 446     }
 447
 448   if (serial_flag)
 449     {
 450       remote_desc = open_tty (p);
 451
 452       old_chain = make_cleanup (close_tty, 0);
 453
 454       c = send_resp (remote_desc, 0x00);
 455
 456       if (c != 0xaa)
 457         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 458                c);
 459
 460       c = send_resp (remote_desc, 0x55);
 461
 462       if (c != 0x55)
 463         error ("Sparclite appears to be ill.");
 464     }
 465   else
 466     {
 467 #ifdef HAVE_SOCKETS
 468       struct hostent *he;
 469       struct sockaddr_in sockaddr;
 470       unsigned char buffer[100];
 471       int cc;
 472
 473       /* Setup the socket.  Must be raw UDP. */
 474
 475       he = gethostbyname (p);
 476
 477       if (!he)
 478         error ("No such host %s.", p);
 479
 480       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 481
 482       old_chain = make_cleanup (close, udp_fd);
 483
 484       sockaddr.sin_family = PF_INET;
 485       sockaddr.sin_port = htons(7000);
 486       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 487
 488       if (connect (udp_fd, &sockaddr, sizeof(sockaddr)))
 489         perror_with_name ("Connect failed");
 490
 491       buffer[0] = 0x5;
 492       buffer[1] = 0;
 493
 494       send_udp_buf (udp_fd, buffer, 2); /* Request version */
 495       cc = recv_udp_buf (udp_fd, buffer, sizeof(buffer), 5); /* Get response */
 496       if (cc == 0)
 497         error ("SPARClite isn't responding.");
 498
 499       if (cc < 3)
 500         error ("SPARClite appears to be ill.");
 501 #else
 502       error ("UDP downloading is not supported for DOS hosts.");
 503 #endif /* HAVE_SOCKETS */
 504     }
 505
 506   printf_unfiltered ("[SPARClite appears to be alive]\n");
 507
 508   push_target (&sparclite_ops);
 509
 510   discard_cleanups (old_chain);
 511
 512   return;
 513 }
 514
 515 static void
 516 sparclite_close (quitting)
 517      int quitting;
 518 {
 519   if (serial_flag)
 520     close_tty (0);
 521 #ifdef HAVE_SOCKETS
 522   else
 523     if (udp_fd != -1)
 524       close (udp_fd);
 525 #endif
 526 }
 527
 528 #define LOAD_ADDRESS 0x40000000
 529
 530 static void
 531 download (target_name, args, from_tty, write_routine, start_routine)
 532      char *target_name;
 533      char *args;
 534      int from_tty;
 535      void (*write_routine) PARAMS ((bfd *from_bfd, asection *from_sec,
 536                                     file_ptr from_addr, bfd_vma to_addr, int len));
 537      void (*start_routine) PARAMS ((bfd_vma entry));
 538 {
 539   struct cleanup *old_chain;
 540   asection *section;
 541   bfd *pbfd;
 542   bfd_vma entry;
 543   int i;
 544 #define WRITESIZE 1024
 545   char *filename;
 546   int quiet;
 547   int nostart;
 548
 549   quiet = 0;
 550   nostart = 0;
 551   filename = NULL;
 552
 553   while (*args != '\000')
 554     {
 555       char *arg;
 556
 557       while (isspace (*args)) args++;
 558
 559       arg = args;
 560
 561       while ((*args != '\000') && !isspace (*args)) args++;
 562
 563       if (*args != '\000')
 564         *args++ = '\000';
 565
 566       if (*arg != '-')
 567         filename = arg;
 568       else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
 569         quiet = 1;
 570       else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
 571         nostart = 1;
 572       else
 573         error ("unknown option `%s'", arg);
 574     }
 575
 576   if (!filename)
 577     filename = get_exec_file (1);
 578
 579   pbfd = bfd_openr (filename, gnutarget);
 580   if (pbfd == NULL)
 581     {
 582       perror_with_name (filename);
 583       return;
 584     }
 585   old_chain = make_cleanup (bfd_close, pbfd);
 586
 587   if (!bfd_check_format (pbfd, bfd_object))
 588     error ("\"%s\" is not an object file: %s", filename,
 589            bfd_errmsg (bfd_get_error ()));
 590
 591   for (section = pbfd->sections; section; section = section->next)
 592     {
 593       if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
 594         {
 595           bfd_vma section_address;
 596           bfd_size_type section_size;
 597           file_ptr fptr;
 598
 599           section_address = bfd_get_section_vma (pbfd, section);
 600           /* Adjust sections from a.out files, since they don't
 601              carry their addresses with.  */
 602           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 603             section_address += LOAD_ADDRESS;
 604
 605           section_size = bfd_get_section_size_before_reloc (section);
 606
 607           if (!quiet)
 608             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 609                              bfd_get_section_name (pbfd, section),
 610                              section_address,
 611                              section_size);
 612
 613           fptr = 0;
 614           while (section_size > 0)
 615             {
 616               int count;
 617               static char inds[] = "|/-\\";
 618               static int k = 0;
 619
 620               QUIT;
 621
 622               count = min (section_size, WRITESIZE);
 623
 624               write_routine (pbfd, section, fptr, section_address, count);
 625
 626               if (!quiet)
 627                 {
 628                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 629                   gdb_flush (gdb_stdout);
 630                 }
 631
 632               section_address += count;
 633               fptr += count;
 634               section_size -= count;
 635             }
 636         }
 637     }
 638
 639   if (!nostart)
 640     {
 641       entry = bfd_get_start_address (pbfd);
 642
 643       if (!quiet)
 644         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 645
 646       start_routine (entry);
 647     }
 648
 649   do_cleanups (old_chain);
 650 }
 651
 652 static void
 653 sparclite_serial_start (entry)
 654      bfd_vma entry;
 655 {
 656   char buffer[5];
 657   int i;
 658
 659   buffer[0] = 0x03;
 660   store_unsigned_integer (buffer + 1, 4, entry);
 661
 662   SERIAL_WRITE (remote_desc, buffer, 1 + 4);
 663   i = readchar (remote_desc, 2);
 664   if (i != 0x55)
 665     error ("Can't start SparcLite.  Error code %d\n", i);
 666 }
 667
 668 static void
 669 sparclite_serial_write (from_bfd, from_sec, from_addr, to_addr, len)
 670      bfd *from_bfd;
 671      asection *from_sec;
 672      file_ptr from_addr;
 673      bfd_vma to_addr;
 674      int len;
 675 {
 676   char buffer[4 + 4 + WRITESIZE]; /* addr + len + data */
 677   unsigned char checksum;
 678   int i;
 679
 680   store_unsigned_integer (buffer, 4, to_addr); /* Address */
 681   store_unsigned_integer (buffer + 4, 4, len); /* Length */
 682
 683   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 684
 685   checksum = 0;
 686   for (i = 0; i < len; i++)
 687     checksum += buffer[8 + i];
 688
 689   i = send_resp (remote_desc, 0x01);
 690
 691   if (i != 0x5a)
 692     error ("Bad response from load command (0x%x)", i);
 693
 694   SERIAL_WRITE (remote_desc, buffer, 4 + 4 + len);
 695   i = readchar (remote_desc, 2);
 696
 697   if (i != checksum)
 698     error ("Bad checksum from load command (0x%x)", i);
 699 }
 700
 701 #ifdef HAVE_SOCKETS
 702
 703 static unsigned short
 704 calc_checksum (buffer, count)
 705      unsigned char *buffer;
 706      int count;
 707 {
 708   unsigned short checksum;
 709
 710   checksum = 0;
 711   for (; count > 0; count -= 2, buffer += 2)
 712     checksum += (*buffer << 8) | *(buffer + 1);
 713
 714   if (count != 0)
 715     checksum += *buffer << 8;
 716
 717   return checksum;
 718 }
 719
 720 static void
 721 sparclite_udp_start (entry)
 722      bfd_vma entry;
 723 {
 724   unsigned char buffer[6];
 725   int i;
 726
 727   buffer[0] = 0x3;
 728   buffer[1] = 0;
 729   buffer[2] = entry >> 24;
 730   buffer[3] = entry >> 16;
 731   buffer[4] = entry >> 8;
 732   buffer[5] = entry;
 733
 734   send_udp_buf (udp_fd, buffer, 6); /* Send start addr */
 735   i = recv_udp_buf (udp_fd, buffer, sizeof(buffer), -1); /* Get response */
 736
 737   if (i < 1 || buffer[0] != 0x55)
 738     error ("Failed to take start address.");
 739 }
 740
 741 static void
 742 sparclite_udp_write (from_bfd, from_sec, from_addr, to_addr, len)
 743      bfd *from_bfd;
 744      asection *from_sec;
 745      file_ptr from_addr;
 746      bfd_vma to_addr;
 747      int len;
 748 {
 749   unsigned char buffer[2000];
 750   unsigned short checksum;
 751   static int pkt_num = 0;
 752   static unsigned long old_addr = -1;
 753   int i;
 754
 755   while (1)
 756     {
 757       if (to_addr != old_addr)
 758         {
 759           buffer[0] = 0x1;      /* Load command */
 760           buffer[1] = 0x1;      /* Loading address */
 761           buffer[2] = to_addr >> 24;
 762           buffer[3] = to_addr >> 16;
 763           buffer[4] = to_addr >> 8;
 764           buffer[5] = to_addr;
 765
 766           checksum = 0;
 767           for (i = 0; i < 6; i++)
 768             checksum += buffer[i];
 769           checksum &= 0xff;
 770
 771           send_udp_buf (udp_fd, buffer, 6);
 772           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 773
 774           if (i < 1)
 775             error ("Got back short checksum for load addr.");
 776
 777           if (checksum != buffer[0])
 778             error ("Got back bad checksum for load addr.");
 779
 780           pkt_num = 0;          /* Load addr resets packet seq # */
 781           old_addr = to_addr;
 782         }
 783
 784       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 785                                 len);
 786
 787       checksum = calc_checksum (buffer + 6, len);
 788
 789       buffer[0] = 0x1;          /* Load command */
 790       buffer[1] = 0x2;          /* Loading data */
 791       buffer[2] = pkt_num >> 8;
 792       buffer[3] = pkt_num;
 793       buffer[4] = checksum >> 8;
 794       buffer[5] = checksum;
 795
 796       send_udp_buf (udp_fd, buffer, len + 6);
 797       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 798
 799       if (i == 0)
 800         {
 801           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 802           continue;
 803         }
 804
 805       if (buffer[0] != 0xff)
 806         error ("Got back bad response for load data.");
 807
 808       old_addr += len;
 809       pkt_num++;
 810
 811       return;
 812     }
 813 }
 814
 815 #endif /* HAVE_SOCKETS */
 816
 817 static void
 818 sparclite_download (filename, from_tty)
 819      char *filename;
 820      int from_tty;
 821 {
 822   if (!serial_flag)
 823 #ifdef HAVE_SOCKETS
 824     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 825               sparclite_udp_start);
 826 #else
 827     abort ();                   /* sparclite_open should prevent this! */
 828 #endif
 829   else
 830     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 831               sparclite_serial_start);
 832 }
 833 \f
 834 /* Define the target subroutine names */
 835
 836 static struct target_ops sparclite_ops =
 837 {
 838   "sparclite",                  /* to_shortname */
 839   "SPARClite remote target",    /* to_longname */
 840   "Use a remote SPARClite target board via a serial line, using a gdb-specific protocol.\n\
 841 Specify the serial device it is connected to (e.g. /dev/ttya).",  /* to_doc */
 842   sparclite_open,               /* to_open */
 843   sparclite_close,              /* to_close */
 844   0,                            /* to_attach */
 845   0,                            /* to_detach */
 846   0,                            /* to_resume */
 847   0,                            /* to_wait */
 848   0,                            /* to_fetch_registers */
 849   0,                            /* to_store_registers */
 850   0,                            /* to_prepare_to_store */
 851   0,                            /* to_xfer_memory */
 852   0,                            /* to_files_info */
 853   0,                            /* to_insert_breakpoint */
 854   0,                            /* to_remove_breakpoint */
 855   0,                            /* to_terminal_init */
 856   0,                            /* to_terminal_inferior */
 857   0,                            /* to_terminal_ours_for_output */
 858   0,                            /* to_terminal_ours */
 859   0,                            /* to_terminal_info */
 860   0,                            /* to_kill */
 861   sparclite_download,           /* to_load */
 862   0,                            /* to_lookup_symbol */
 863   0,                            /* to_create_inferior */
 864   0,                            /* to_mourn_inferior */
 865   0,                            /* to_can_run */
 866   0,                            /* to_notice_signals */
 867   0,                            /* to_thread_alive */
 868   0,                            /* to_stop */
 869   download_stratum,             /* to_stratum */
 870   0,                            /* to_next */
 871   0,                            /* to_has_all_memory */
 872   0,                            /* to_has_memory */
 873   0,                            /* to_has_stack */
 874   0,                            /* to_has_registers */
 875   0,                            /* to_has_execution */
 876   0,                            /* sections */
 877   0,                            /* sections_end */
 878   OPS_MAGIC                     /* to_magic */
 879   };
 880
 881 void
 882 _initialize_sparcl_tdep ()
 883 {
 884   add_target (&sparclite_ops);
 885 }