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 (char *name);
  46 static int send_resp (serial_t desc, char c);
  47 static void close_tty (void * ignore);
  48 #ifdef HAVE_SOCKETS
  49 static int recv_udp_buf (int fd, unsigned char *buf, int len, int timeout);
  50 static int send_udp_buf (int fd, unsigned char *buf, int len);
  51 #endif
  52 static void sparclite_open (char *name, int from_tty);
  53 static void sparclite_close (int quitting);
  54 static void download (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 (bfd_vma entry);
  61 static void sparclite_serial_write (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 (unsigned char *buffer, int count);
  66 static void sparclite_udp_start (bfd_vma entry);
  67 static void sparclite_udp_write (bfd * from_bfd, asection * from_sec,
  68                                  file_ptr from_addr, bfd_vma to_addr,
  69                                  int len);
  70 #endif
  71 static void sparclite_download (char *filename, int from_tty);
  72
  73 #define DDA2_SUP_ASI            0xb000000
  74 #define DDA1_SUP_ASI            0xb0000
  75
  76 #define DDA2_ASI_MASK           0xff000000
  77 #define DDA1_ASI_MASK           0xff0000
  78 #define DIA2_SUP_MODE           0x8000
  79 #define DIA1_SUP_MODE           0x4000
  80 #define DDA2_ENABLE             0x100
  81 #define DDA1_ENABLE             0x80
  82 #define DIA2_ENABLE             0x40
  83 #define DIA1_ENABLE             0x20
  84 #define DSINGLE_STEP            0x10    /* not used */
  85 #define DDV_TYPE_MASK           0xc
  86 #define DDV_TYPE_LOAD           0x0
  87 #define DDV_TYPE_STORE          0x4
  88 #define DDV_TYPE_ACCESS         0x8
  89 #define DDV_TYPE_ALWAYS         0xc
  90 #define DDV_COND                0x2
  91 #define DDV_MASK                0x1
  92
  93 int
  94 sparclite_insert_watchpoint (addr, len, type)
  95      CORE_ADDR addr;
  96      int len;
  97      int type;
  98 {
  99   CORE_ADDR dcr;
 100
 101   dcr = read_register (DCR_REGNUM);
 102
 103   if (!(dcr & DDA1_ENABLE))
 104     {
 105       write_register (DDA1_REGNUM, addr);
 106       dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK);
 107       dcr |= (DDA1_SUP_ASI | DDA1_ENABLE);
 108       if (type == 1)
 109         {
 110           write_register (DDV1_REGNUM, 0);
 111           write_register (DDV2_REGNUM, 0xffffffff);
 112           dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK));
 113         }
 114       else if (type == 0)
 115         {
 116           write_register (DDV1_REGNUM, 0);
 117           write_register (DDV2_REGNUM, 0xffffffff);
 118           dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK));
 119         }
 120       else
 121         {
 122           write_register (DDV1_REGNUM, 0);
 123           write_register (DDV2_REGNUM, 0xffffffff);
 124           dcr |= (DDV_TYPE_ACCESS);
 125         }
 126       write_register (DCR_REGNUM, dcr);
 127     }
 128   else if (!(dcr & DDA2_ENABLE))
 129     {
 130       write_register (DDA2_REGNUM, addr);
 131       dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK);
 132       dcr |= (DDA2_SUP_ASI | DDA2_ENABLE);
 133       if (type == 1)
 134         {
 135           write_register (DDV1_REGNUM, 0);
 136           write_register (DDV2_REGNUM, 0xffffffff);
 137           dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK);
 138         }
 139       else if (type == 0)
 140         {
 141           write_register (DDV1_REGNUM, 0);
 142           write_register (DDV2_REGNUM, 0xffffffff);
 143           dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK);
 144         }
 145       else
 146         {
 147           write_register (DDV1_REGNUM, 0);
 148           write_register (DDV2_REGNUM, 0xffffffff);
 149           dcr |= (DDV_TYPE_ACCESS);
 150         }
 151       write_register (DCR_REGNUM, dcr);
 152     }
 153   else
 154     return -1;
 155
 156   return 0;
 157 }
 158
 159 int
 160 sparclite_remove_watchpoint (addr, len, type)
 161      CORE_ADDR addr;
 162      int len;
 163      int type;
 164 {
 165   CORE_ADDR dcr, dda1, dda2;
 166
 167   dcr = read_register (DCR_REGNUM);
 168   dda1 = read_register (DDA1_REGNUM);
 169   dda2 = read_register (DDA2_REGNUM);
 170
 171   if ((dcr & DDA1_ENABLE) && addr == dda1)
 172     write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE));
 173   else if ((dcr & DDA2_ENABLE) && addr == dda2)
 174     write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE));
 175   else
 176     return -1;
 177
 178   return 0;
 179 }
 180
 181 int
 182 sparclite_insert_hw_breakpoint (addr, len)
 183      CORE_ADDR addr;
 184      int len;
 185 {
 186   CORE_ADDR dcr;
 187
 188   dcr = read_register (DCR_REGNUM);
 189
 190   if (!(dcr & DIA1_ENABLE))
 191     {
 192       write_register (DIA1_REGNUM, addr);
 193       write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE));
 194     }
 195   else if (!(dcr & DIA2_ENABLE))
 196     {
 197       write_register (DIA2_REGNUM, addr);
 198       write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE));
 199     }
 200   else
 201     return -1;
 202
 203   return 0;
 204 }
 205
 206 int
 207 sparclite_remove_hw_breakpoint (addr, shadow)
 208      CORE_ADDR addr;
 209      int shadow;
 210 {
 211   CORE_ADDR dcr, dia1, dia2;
 212
 213   dcr = read_register (DCR_REGNUM);
 214   dia1 = read_register (DIA1_REGNUM);
 215   dia2 = read_register (DIA2_REGNUM);
 216
 217   if ((dcr & DIA1_ENABLE) && addr == dia1)
 218     write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE));
 219   else if ((dcr & DIA2_ENABLE) && addr == dia2)
 220     write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE));
 221   else
 222     return -1;
 223
 224   return 0;
 225 }
 226
 227 int
 228 sparclite_check_watch_resources (type, cnt, ot)
 229      int type;
 230      int cnt;
 231      int ot;
 232 {
 233   /* Watchpoints not supported on simulator.  */
 234   if (strcmp (target_shortname, "sim") == 0)
 235     return 0;
 236
 237   if (type == bp_hardware_breakpoint)
 238     {
 239       if (TARGET_HW_BREAK_LIMIT == 0)
 240         return 0;
 241       else if (cnt <= TARGET_HW_BREAK_LIMIT)
 242         return 1;
 243     }
 244   else
 245     {
 246       if (TARGET_HW_WATCH_LIMIT == 0)
 247         return 0;
 248       else if (ot)
 249         return -1;
 250       else if (cnt <= TARGET_HW_WATCH_LIMIT)
 251         return 1;
 252     }
 253   return -1;
 254 }
 255
 256 CORE_ADDR
 257 sparclite_stopped_data_address ()
 258 {
 259   CORE_ADDR dsr, dda1, dda2;
 260
 261   dsr = read_register (DSR_REGNUM);
 262   dda1 = read_register (DDA1_REGNUM);
 263   dda2 = read_register (DDA2_REGNUM);
 264
 265   if (dsr & 0x10)
 266     return dda1;
 267   else if (dsr & 0x20)
 268     return dda2;
 269   else
 270     return 0;
 271 }
 272 \f
 273 static serial_t
 274 open_tty (name)
 275      char *name;
 276 {
 277   serial_t desc;
 278
 279   desc = SERIAL_OPEN (name);
 280   if (!desc)
 281     perror_with_name (name);
 282
 283   if (baud_rate != -1)
 284     {
 285       if (SERIAL_SETBAUDRATE (desc, baud_rate))
 286         {
 287           SERIAL_CLOSE (desc);
 288           perror_with_name (name);
 289         }
 290     }
 291
 292   SERIAL_RAW (desc);
 293
 294   SERIAL_FLUSH_INPUT (desc);
 295
 296   return desc;
 297 }
 298
 299 /* Read a single character from the remote end, masking it down to 7 bits. */
 300
 301 static int
 302 readchar (desc, timeout)
 303      serial_t desc;
 304      int timeout;
 305 {
 306   int ch;
 307   char s[10];
 308
 309   ch = SERIAL_READCHAR (desc, timeout);
 310
 311   switch (ch)
 312     {
 313     case SERIAL_EOF:
 314       error ("SPARClite remote connection closed");
 315     case SERIAL_ERROR:
 316       perror_with_name ("SPARClite communication error");
 317     case SERIAL_TIMEOUT:
 318       error ("SPARClite remote timeout");
 319     default:
 320       if (remote_debug > 0)
 321         {
 322           sprintf (s, "[%02x]", ch & 0xff);
 323           puts_debug ("read -->", s, "<--");
 324         }
 325       return ch;
 326     }
 327 }
 328
 329 static void
 330 debug_serial_write (desc, buf, len)
 331      serial_t desc;
 332      char *buf;
 333      int len;
 334 {
 335   char s[10];
 336
 337   SERIAL_WRITE (desc, buf, len);
 338   if (remote_debug > 0)
 339     {
 340       while (len-- > 0)
 341         {
 342           sprintf (s, "[%02x]", *buf & 0xff);
 343           puts_debug ("Sent -->", s, "<--");
 344           buf++;
 345         }
 346     }
 347 }
 348
 349
 350 static int
 351 send_resp (desc, c)
 352      serial_t desc;
 353      char c;
 354 {
 355   debug_serial_write (desc, &c, 1);
 356   return readchar (desc, remote_timeout);
 357 }
 358
 359 static void
 360 close_tty (void *ignore)
 361 {
 362   if (!remote_desc)
 363     return;
 364
 365   SERIAL_CLOSE (remote_desc);
 366
 367   remote_desc = NULL;
 368 }
 369
 370 #ifdef HAVE_SOCKETS
 371 static int
 372 recv_udp_buf (fd, buf, len, timeout)
 373      int fd, len;
 374      unsigned char *buf;
 375      int timeout;
 376 {
 377   int cc;
 378   fd_set readfds;
 379
 380   FD_ZERO (&readfds);
 381   FD_SET (fd, &readfds);
 382
 383   if (timeout >= 0)
 384     {
 385       struct timeval timebuf;
 386
 387       timebuf.tv_sec = timeout;
 388       timebuf.tv_usec = 0;
 389       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 390     }
 391   else
 392     cc = select (fd + 1, &readfds, 0, 0, 0);
 393
 394   if (cc == 0)
 395     return 0;
 396
 397   if (cc != 1)
 398     perror_with_name ("recv_udp_buf: Bad return value from select:");
 399
 400   cc = recv (fd, buf, len, 0);
 401
 402   if (cc < 0)
 403     perror_with_name ("Got an error from recv: ");
 404 }
 405
 406 static int
 407 send_udp_buf (fd, buf, len)
 408      int fd, len;
 409      unsigned char *buf;
 410 {
 411   int cc;
 412
 413   cc = send (fd, buf, len, 0);
 414
 415   if (cc == len)
 416     return;
 417
 418   if (cc < 0)
 419     perror_with_name ("Got an error from send: ");
 420
 421   error ("Short count in send: tried %d, sent %d\n", len, cc);
 422 }
 423 #endif /* HAVE_SOCKETS */
 424
 425 static void
 426 sparclite_open (name, from_tty)
 427      char *name;
 428      int from_tty;
 429 {
 430   struct cleanup *old_chain;
 431   int c;
 432   char *p;
 433
 434   if (!name)
 435     error ("You need to specify what device or hostname is associated with the SparcLite board.");
 436
 437   target_preopen (from_tty);
 438
 439   unpush_target (&sparclite_ops);
 440
 441   if (remote_target_name)
 442     free (remote_target_name);
 443
 444   remote_target_name = strsave (name);
 445
 446   /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
 447      mean either a serial port on a terminal server, or the IP address of a
 448      SPARClite demo board.  If there's no colon, then it pretty much has to be
 449      a local device (except for DOS... grrmble) */
 450
 451   p = strchr (name, ' ');
 452
 453   if (p)
 454     {
 455       *p++ = '\000';
 456       while ((*p != '\000') && isspace (*p))
 457         p++;
 458
 459       if (strncmp (name, "serial", strlen (name)) == 0)
 460         serial_flag = 1;
 461       else if (strncmp (name, "udp", strlen (name)) == 0)
 462         serial_flag = 0;
 463       else
 464         error ("Must specify either `serial' or `udp'.");
 465     }
 466   else
 467     {
 468       p = name;
 469
 470       if (!strchr (name, ':'))
 471         serial_flag = 1;        /* No colon is unambiguous (local device) */
 472       else
 473         error ("Usage: target sparclite serial /dev/ttyb\n\
 474 or: target sparclite udp host");
 475     }
 476
 477   if (serial_flag)
 478     {
 479       remote_desc = open_tty (p);
 480
 481       old_chain = make_cleanup (close_tty, 0 /*ignore*/);
 482
 483       c = send_resp (remote_desc, 0x00);
 484
 485       if (c != 0xaa)
 486         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 487                c);
 488
 489       c = send_resp (remote_desc, 0x55);
 490
 491       if (c != 0x55)
 492         error ("Sparclite appears to be ill.");
 493     }
 494   else
 495     {
 496 #ifdef HAVE_SOCKETS
 497       struct hostent *he;
 498       struct sockaddr_in sockaddr;
 499       unsigned char buffer[100];
 500       int cc;
 501
 502       /* Setup the socket.  Must be raw UDP. */
 503
 504       he = gethostbyname (p);
 505
 506       if (!he)
 507         error ("No such host %s.", p);
 508
 509       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 510
 511       old_chain = make_cleanup (close, udp_fd);
 512
 513       sockaddr.sin_family = PF_INET;
 514       sockaddr.sin_port = htons (7000);
 515       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 516
 517       if (connect (udp_fd, &sockaddr, sizeof (sockaddr)))
 518         perror_with_name ("Connect failed");
 519
 520       buffer[0] = 0x5;
 521       buffer[1] = 0;
 522
 523       send_udp_buf (udp_fd, buffer, 2);         /* Request version */
 524       cc = recv_udp_buf (udp_fd, buffer, sizeof (buffer), 5);   /* Get response */
 525       if (cc == 0)
 526         error ("SPARClite isn't responding.");
 527
 528       if (cc < 3)
 529         error ("SPARClite appears to be ill.");
 530 #else
 531       error ("UDP downloading is not supported for DOS hosts.");
 532 #endif /* HAVE_SOCKETS */
 533     }
 534
 535   printf_unfiltered ("[SPARClite appears to be alive]\n");
 536
 537   push_target (&sparclite_ops);
 538
 539   discard_cleanups (old_chain);
 540
 541   return;
 542 }
 543
 544 static void
 545 sparclite_close (quitting)
 546      int quitting;
 547 {
 548   if (serial_flag)
 549     close_tty (0);
 550 #ifdef HAVE_SOCKETS
 551   else if (udp_fd != -1)
 552     close (udp_fd);
 553 #endif
 554 }
 555
 556 #define LOAD_ADDRESS 0x40000000
 557
 558 static void
 559 download (target_name, args, from_tty, write_routine, start_routine)
 560      char *target_name;
 561      char *args;
 562      int from_tty;
 563      void (*write_routine) PARAMS ((bfd * from_bfd, asection * from_sec,
 564                              file_ptr from_addr, bfd_vma to_addr, int len));
 565      void (*start_routine) PARAMS ((bfd_vma entry));
 566 {
 567   struct cleanup *old_chain;
 568   asection *section;
 569   bfd *pbfd;
 570   bfd_vma entry;
 571   int i;
 572 #define WRITESIZE 1024
 573   char *filename;
 574   int quiet;
 575   int nostart;
 576
 577   quiet = 0;
 578   nostart = 0;
 579   filename = NULL;
 580
 581   while (*args != '\000')
 582     {
 583       char *arg;
 584
 585       while (isspace (*args))
 586         args++;
 587
 588       arg = args;
 589
 590       while ((*args != '\000') && !isspace (*args))
 591         args++;
 592
 593       if (*args != '\000')
 594         *args++ = '\000';
 595
 596       if (*arg != '-')
 597         filename = arg;
 598       else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
 599         quiet = 1;
 600       else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
 601         nostart = 1;
 602       else
 603         error ("unknown option `%s'", arg);
 604     }
 605
 606   if (!filename)
 607     filename = get_exec_file (1);
 608
 609   pbfd = bfd_openr (filename, gnutarget);
 610   if (pbfd == NULL)
 611     {
 612       perror_with_name (filename);
 613       return;
 614     }
 615   old_chain = make_cleanup_bfd_close (pbfd);
 616
 617   if (!bfd_check_format (pbfd, bfd_object))
 618     error ("\"%s\" is not an object file: %s", filename,
 619            bfd_errmsg (bfd_get_error ()));
 620
 621   for (section = pbfd->sections; section; section = section->next)
 622     {
 623       if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
 624         {
 625           bfd_vma section_address;
 626           bfd_size_type section_size;
 627           file_ptr fptr;
 628           const char *section_name;
 629
 630           section_name = bfd_get_section_name (pbfd, section);
 631
 632           section_address = bfd_get_section_vma (pbfd, section);
 633
 634           /* Adjust sections from a.out files, since they don't
 635              carry their addresses with.  */
 636           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 637             {
 638               if (strcmp (section_name, ".text") == 0)
 639                 section_address = bfd_get_start_address (pbfd);
 640               else if (strcmp (section_name, ".data") == 0)
 641                 {
 642                   /* Read the first 8 bytes of the data section.
 643                      There should be the string 'DaTa' followed by
 644                      a word containing the actual section address. */
 645                   struct data_marker
 646                     {
 647                       char signature[4];        /* 'DaTa' */
 648                       unsigned char sdata[4];   /* &sdata */
 649                     }
 650                   marker;
 651                   bfd_get_section_contents (pbfd, section, &marker, 0,
 652                                             sizeof (marker));
 653                   if (strncmp (marker.signature, "DaTa", 4) == 0)
 654                     {
 655                       if (TARGET_BYTE_ORDER == BIG_ENDIAN)
 656                         section_address = bfd_getb32 (marker.sdata);
 657                       else
 658                         section_address = bfd_getl32 (marker.sdata);
 659                     }
 660                 }
 661             }
 662
 663           section_size = bfd_get_section_size_before_reloc (section);
 664
 665           if (!quiet)
 666             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 667                              bfd_get_section_name (pbfd, section),
 668                              section_address,
 669                              section_size);
 670
 671           fptr = 0;
 672           while (section_size > 0)
 673             {
 674               int count;
 675               static char inds[] = "|/-\\";
 676               static int k = 0;
 677
 678               QUIT;
 679
 680               count = min (section_size, WRITESIZE);
 681
 682               write_routine (pbfd, section, fptr, section_address, count);
 683
 684               if (!quiet)
 685                 {
 686                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 687                   gdb_flush (gdb_stdout);
 688                 }
 689
 690               section_address += count;
 691               fptr += count;
 692               section_size -= count;
 693             }
 694         }
 695     }
 696
 697   if (!nostart)
 698     {
 699       entry = bfd_get_start_address (pbfd);
 700
 701       if (!quiet)
 702         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 703
 704       start_routine (entry);
 705     }
 706
 707   do_cleanups (old_chain);
 708 }
 709
 710 static void
 711 sparclite_serial_start (entry)
 712      bfd_vma entry;
 713 {
 714   char buffer[5];
 715   int i;
 716
 717   buffer[0] = 0x03;
 718   store_unsigned_integer (buffer + 1, 4, entry);
 719
 720   debug_serial_write (remote_desc, buffer, 1 + 4);
 721   i = readchar (remote_desc, remote_timeout);
 722   if (i != 0x55)
 723     error ("Can't start SparcLite.  Error code %d\n", i);
 724 }
 725
 726 static void
 727 sparclite_serial_write (from_bfd, from_sec, from_addr, to_addr, len)
 728      bfd *from_bfd;
 729      asection *from_sec;
 730      file_ptr from_addr;
 731      bfd_vma to_addr;
 732      int len;
 733 {
 734   char buffer[4 + 4 + WRITESIZE];       /* addr + len + data */
 735   unsigned char checksum;
 736   int i;
 737
 738   store_unsigned_integer (buffer, 4, to_addr);  /* Address */
 739   store_unsigned_integer (buffer + 4, 4, len);  /* Length */
 740
 741   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 742
 743   checksum = 0;
 744   for (i = 0; i < len; i++)
 745     checksum += buffer[8 + i];
 746
 747   i = send_resp (remote_desc, 0x01);
 748
 749   if (i != 0x5a)
 750     error ("Bad response from load command (0x%x)", i);
 751
 752   debug_serial_write (remote_desc, buffer, 4 + 4 + len);
 753   i = readchar (remote_desc, remote_timeout);
 754
 755   if (i != checksum)
 756     error ("Bad checksum from load command (0x%x)", i);
 757 }
 758
 759 #ifdef HAVE_SOCKETS
 760
 761 static unsigned short
 762 calc_checksum (buffer, count)
 763      unsigned char *buffer;
 764      int count;
 765 {
 766   unsigned short checksum;
 767
 768   checksum = 0;
 769   for (; count > 0; count -= 2, buffer += 2)
 770     checksum += (*buffer << 8) | *(buffer + 1);
 771
 772   if (count != 0)
 773     checksum += *buffer << 8;
 774
 775   return checksum;
 776 }
 777
 778 static void
 779 sparclite_udp_start (entry)
 780      bfd_vma entry;
 781 {
 782   unsigned char buffer[6];
 783   int i;
 784
 785   buffer[0] = 0x3;
 786   buffer[1] = 0;
 787   buffer[2] = entry >> 24;
 788   buffer[3] = entry >> 16;
 789   buffer[4] = entry >> 8;
 790   buffer[5] = entry;
 791
 792   send_udp_buf (udp_fd, buffer, 6);     /* Send start addr */
 793   i = recv_udp_buf (udp_fd, buffer, sizeof (buffer), -1);       /* Get response */
 794
 795   if (i < 1 || buffer[0] != 0x55)
 796     error ("Failed to take start address.");
 797 }
 798
 799 static void
 800 sparclite_udp_write (from_bfd, from_sec, from_addr, to_addr, len)
 801      bfd *from_bfd;
 802      asection *from_sec;
 803      file_ptr from_addr;
 804      bfd_vma to_addr;
 805      int len;
 806 {
 807   unsigned char buffer[2000];
 808   unsigned short checksum;
 809   static int pkt_num = 0;
 810   static unsigned long old_addr = -1;
 811   int i;
 812
 813   while (1)
 814     {
 815       if (to_addr != old_addr)
 816         {
 817           buffer[0] = 0x1;      /* Load command */
 818           buffer[1] = 0x1;      /* Loading address */
 819           buffer[2] = to_addr >> 24;
 820           buffer[3] = to_addr >> 16;
 821           buffer[4] = to_addr >> 8;
 822           buffer[5] = to_addr;
 823
 824           checksum = 0;
 825           for (i = 0; i < 6; i++)
 826             checksum += buffer[i];
 827           checksum &= 0xff;
 828
 829           send_udp_buf (udp_fd, buffer, 6);
 830           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 831
 832           if (i < 1)
 833             error ("Got back short checksum for load addr.");
 834
 835           if (checksum != buffer[0])
 836             error ("Got back bad checksum for load addr.");
 837
 838           pkt_num = 0;          /* Load addr resets packet seq # */
 839           old_addr = to_addr;
 840         }
 841
 842       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 843                                 len);
 844
 845       checksum = calc_checksum (buffer + 6, len);
 846
 847       buffer[0] = 0x1;          /* Load command */
 848       buffer[1] = 0x2;          /* Loading data */
 849       buffer[2] = pkt_num >> 8;
 850       buffer[3] = pkt_num;
 851       buffer[4] = checksum >> 8;
 852       buffer[5] = checksum;
 853
 854       send_udp_buf (udp_fd, buffer, len + 6);
 855       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 856
 857       if (i == 0)
 858         {
 859           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 860           continue;
 861         }
 862
 863       if (buffer[0] != 0xff)
 864         error ("Got back bad response for load data.");
 865
 866       old_addr += len;
 867       pkt_num++;
 868
 869       return;
 870     }
 871 }
 872
 873 #endif /* HAVE_SOCKETS */
 874
 875 static void
 876 sparclite_download (filename, from_tty)
 877      char *filename;
 878      int from_tty;
 879 {
 880   if (!serial_flag)
 881 #ifdef HAVE_SOCKETS
 882     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 883               sparclite_udp_start);
 884 #else
 885     abort ();                   /* sparclite_open should prevent this! */
 886 #endif
 887   else
 888     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 889               sparclite_serial_start);
 890 }
 891 \f
 892 /* Set up the sparclite target vector.  */
 893
 894 static void
 895 init_sparclite_ops (void)
 896 {
 897   sparclite_ops.to_shortname = "sparclite";
 898   sparclite_ops.to_longname = "SPARClite download target";
 899   sparclite_ops.to_doc = "Download to a remote SPARClite target board via serial of UDP.\n\
 900 Specify the device it is connected to (e.g. /dev/ttya).";
 901   sparclite_ops.to_open = sparclite_open;
 902   sparclite_ops.to_close = sparclite_close;
 903   sparclite_ops.to_load = sparclite_download;
 904   sparclite_ops.to_stratum = download_stratum;
 905   sparclite_ops.to_magic = OPS_MAGIC;
 906 }
 907
 908 void
 909 _initialize_sparcl_tdep ()
 910 {
 911   init_sparclite_ops ();
 912   add_target (&sparclite_ops);
 913 }