gdb/sparcl-tdep.c

   1 /* Target dependent code for the Fujitsu SPARClite for GDB, the GNU debugger.
   2    Copyright 1994, 1995, 1996, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "gdbcore.h"
  24 #include "breakpoint.h"
  25 #include "target.h"
  26 #include "serial.h"
  27 #include "regcache.h"
  28 #include <sys/types.h>
  29
  30 #if (!defined(__GO32__) && !defined(_WIN32)) || defined(__CYGWIN__)
  31 #define HAVE_SOCKETS
  32 #include <sys/time.h>
  33 #include <sys/socket.h>
  34 #include <netinet/in.h>
  35 #include <netdb.h>
  36 #endif
  37
  38 static struct target_ops sparclite_ops;
  39
  40 static char *remote_target_name = NULL;
  41 static struct serial *remote_desc = NULL;
  42 static int serial_flag;
  43 #ifdef HAVE_SOCKETS
  44 static int udp_fd = -1;
  45 #endif
  46
  47 static struct serial *open_tty (char *name);
  48 static int send_resp (struct serial *desc, char c);
  49 static void close_tty (void * ignore);
  50 #ifdef HAVE_SOCKETS
  51 static int recv_udp_buf (int fd, unsigned char *buf, int len, int timeout);
  52 static int send_udp_buf (int fd, unsigned char *buf, int len);
  53 #endif
  54 static void sparclite_open (char *name, int from_tty);
  55 static void sparclite_close (int quitting);
  56 static void download (char *target_name, char *args, int from_tty,
  57                       void (*write_routine) (bfd * from_bfd,
  58                                              asection * from_sec,
  59                                              file_ptr from_addr,
  60                                              bfd_vma to_addr, int len),
  61                       void (*start_routine) (bfd_vma entry));
  62 static void sparclite_serial_start (bfd_vma entry);
  63 static void sparclite_serial_write (bfd * from_bfd, asection * from_sec,
  64                                     file_ptr from_addr,
  65                                     bfd_vma to_addr, int len);
  66 #ifdef HAVE_SOCKETS
  67 static unsigned short calc_checksum (unsigned char *buffer, int count);
  68 static void sparclite_udp_start (bfd_vma entry);
  69 static void sparclite_udp_write (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 (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 (CORE_ADDR addr, int len, int type)
  97 {
  98   CORE_ADDR dcr;
  99
 100   dcr = read_register (DCR_REGNUM);
 101
 102   if (!(dcr & DDA1_ENABLE))
 103     {
 104       write_register (DDA1_REGNUM, addr);
 105       dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK);
 106       dcr |= (DDA1_SUP_ASI | DDA1_ENABLE);
 107       if (type == 1)
 108         {
 109           write_register (DDV1_REGNUM, 0);
 110           write_register (DDV2_REGNUM, 0xffffffff);
 111           dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK));
 112         }
 113       else if (type == 0)
 114         {
 115           write_register (DDV1_REGNUM, 0);
 116           write_register (DDV2_REGNUM, 0xffffffff);
 117           dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK));
 118         }
 119       else
 120         {
 121           write_register (DDV1_REGNUM, 0);
 122           write_register (DDV2_REGNUM, 0xffffffff);
 123           dcr |= (DDV_TYPE_ACCESS);
 124         }
 125       write_register (DCR_REGNUM, dcr);
 126     }
 127   else if (!(dcr & DDA2_ENABLE))
 128     {
 129       write_register (DDA2_REGNUM, addr);
 130       dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK);
 131       dcr |= (DDA2_SUP_ASI | DDA2_ENABLE);
 132       if (type == 1)
 133         {
 134           write_register (DDV1_REGNUM, 0);
 135           write_register (DDV2_REGNUM, 0xffffffff);
 136           dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK);
 137         }
 138       else if (type == 0)
 139         {
 140           write_register (DDV1_REGNUM, 0);
 141           write_register (DDV2_REGNUM, 0xffffffff);
 142           dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK);
 143         }
 144       else
 145         {
 146           write_register (DDV1_REGNUM, 0);
 147           write_register (DDV2_REGNUM, 0xffffffff);
 148           dcr |= (DDV_TYPE_ACCESS);
 149         }
 150       write_register (DCR_REGNUM, dcr);
 151     }
 152   else
 153     return -1;
 154
 155   return 0;
 156 }
 157
 158 int
 159 sparclite_remove_watchpoint (CORE_ADDR addr, int len, int type)
 160 {
 161   CORE_ADDR dcr, dda1, dda2;
 162
 163   dcr = read_register (DCR_REGNUM);
 164   dda1 = read_register (DDA1_REGNUM);
 165   dda2 = read_register (DDA2_REGNUM);
 166
 167   if ((dcr & DDA1_ENABLE) && addr == dda1)
 168     write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE));
 169   else if ((dcr & DDA2_ENABLE) && addr == dda2)
 170     write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE));
 171   else
 172     return -1;
 173
 174   return 0;
 175 }
 176
 177 int
 178 sparclite_insert_hw_breakpoint (CORE_ADDR addr, int len)
 179 {
 180   CORE_ADDR dcr;
 181
 182   dcr = read_register (DCR_REGNUM);
 183
 184   if (!(dcr & DIA1_ENABLE))
 185     {
 186       write_register (DIA1_REGNUM, addr);
 187       write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE));
 188     }
 189   else if (!(dcr & DIA2_ENABLE))
 190     {
 191       write_register (DIA2_REGNUM, addr);
 192       write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE));
 193     }
 194   else
 195     return -1;
 196
 197   return 0;
 198 }
 199
 200 int
 201 sparclite_remove_hw_breakpoint (CORE_ADDR addr, int shadow)
 202 {
 203   CORE_ADDR dcr, dia1, dia2;
 204
 205   dcr = read_register (DCR_REGNUM);
 206   dia1 = read_register (DIA1_REGNUM);
 207   dia2 = read_register (DIA2_REGNUM);
 208
 209   if ((dcr & DIA1_ENABLE) && addr == dia1)
 210     write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE));
 211   else if ((dcr & DIA2_ENABLE) && addr == dia2)
 212     write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE));
 213   else
 214     return -1;
 215
 216   return 0;
 217 }
 218
 219 int
 220 sparclite_check_watch_resources (int type, int cnt, int ot)
 221 {
 222   /* Watchpoints not supported on simulator.  */
 223   if (strcmp (target_shortname, "sim") == 0)
 224     return 0;
 225
 226   if (type == bp_hardware_breakpoint)
 227     {
 228       if (TARGET_HW_BREAK_LIMIT == 0)
 229         return 0;
 230       else if (cnt <= TARGET_HW_BREAK_LIMIT)
 231         return 1;
 232     }
 233   else
 234     {
 235       if (TARGET_HW_WATCH_LIMIT == 0)
 236         return 0;
 237       else if (ot)
 238         return -1;
 239       else if (cnt <= TARGET_HW_WATCH_LIMIT)
 240         return 1;
 241     }
 242   return -1;
 243 }
 244
 245 CORE_ADDR
 246 sparclite_stopped_data_address (void)
 247 {
 248   CORE_ADDR dsr, dda1, dda2;
 249
 250   dsr = read_register (DSR_REGNUM);
 251   dda1 = read_register (DDA1_REGNUM);
 252   dda2 = read_register (DDA2_REGNUM);
 253
 254   if (dsr & 0x10)
 255     return dda1;
 256   else if (dsr & 0x20)
 257     return dda2;
 258   else
 259     return 0;
 260 }
 261 \f
 262 static struct serial *
 263 open_tty (char *name)
 264 {
 265   struct serial *desc;
 266
 267   desc = serial_open (name);
 268   if (!desc)
 269     perror_with_name (name);
 270
 271   if (baud_rate != -1)
 272     {
 273       if (serial_setbaudrate (desc, baud_rate))
 274         {
 275           serial_close (desc);
 276           perror_with_name (name);
 277         }
 278     }
 279
 280   serial_raw (desc);
 281
 282   serial_flush_input (desc);
 283
 284   return desc;
 285 }
 286
 287 /* Read a single character from the remote end, masking it down to 7 bits. */
 288
 289 static int
 290 readchar (struct serial *desc, int timeout)
 291 {
 292   int ch;
 293   char s[10];
 294
 295   ch = serial_readchar (desc, timeout);
 296
 297   switch (ch)
 298     {
 299     case SERIAL_EOF:
 300       error ("SPARClite remote connection closed");
 301     case SERIAL_ERROR:
 302       perror_with_name ("SPARClite communication error");
 303     case SERIAL_TIMEOUT:
 304       error ("SPARClite remote timeout");
 305     default:
 306       if (remote_debug > 0)
 307         {
 308           sprintf (s, "[%02x]", ch & 0xff);
 309           puts_debug ("read -->", s, "<--");
 310         }
 311       return ch;
 312     }
 313 }
 314
 315 static void
 316 debug_serial_write (struct serial *desc, char *buf, int len)
 317 {
 318   char s[10];
 319
 320   serial_write (desc, buf, len);
 321   if (remote_debug > 0)
 322     {
 323       while (len-- > 0)
 324         {
 325           sprintf (s, "[%02x]", *buf & 0xff);
 326           puts_debug ("Sent -->", s, "<--");
 327           buf++;
 328         }
 329     }
 330 }
 331
 332
 333 static int
 334 send_resp (struct serial *desc, char c)
 335 {
 336   debug_serial_write (desc, &c, 1);
 337   return readchar (desc, remote_timeout);
 338 }
 339
 340 static void
 341 close_tty (void *ignore)
 342 {
 343   if (!remote_desc)
 344     return;
 345
 346   serial_close (remote_desc);
 347
 348   remote_desc = NULL;
 349 }
 350
 351 #ifdef HAVE_SOCKETS
 352 static int
 353 recv_udp_buf (int fd, unsigned char *buf, int len, int timeout)
 354 {
 355   int cc;
 356   fd_set readfds;
 357
 358   FD_ZERO (&readfds);
 359   FD_SET (fd, &readfds);
 360
 361   if (timeout >= 0)
 362     {
 363       struct timeval timebuf;
 364
 365       timebuf.tv_sec = timeout;
 366       timebuf.tv_usec = 0;
 367       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 368     }
 369   else
 370     cc = select (fd + 1, &readfds, 0, 0, 0);
 371
 372   if (cc == 0)
 373     return 0;
 374
 375   if (cc != 1)
 376     perror_with_name ("recv_udp_buf: Bad return value from select:");
 377
 378   cc = recv (fd, buf, len, 0);
 379
 380   if (cc < 0)
 381     perror_with_name ("Got an error from recv: ");
 382 }
 383
 384 static int
 385 send_udp_buf (int fd, unsigned char *buf, int len)
 386 {
 387   int cc;
 388
 389   cc = send (fd, buf, len, 0);
 390
 391   if (cc == len)
 392     return;
 393
 394   if (cc < 0)
 395     perror_with_name ("Got an error from send: ");
 396
 397   error ("Short count in send: tried %d, sent %d\n", len, cc);
 398 }
 399 #endif /* HAVE_SOCKETS */
 400
 401 static void
 402 sparclite_open (char *name, int from_tty)
 403 {
 404   struct cleanup *old_chain;
 405   int c;
 406   char *p;
 407
 408   if (!name)
 409     error ("You need to specify what device or hostname is associated with the SparcLite board.");
 410
 411   target_preopen (from_tty);
 412
 413   unpush_target (&sparclite_ops);
 414
 415   if (remote_target_name)
 416     xfree (remote_target_name);
 417
 418   remote_target_name = xstrdup (name);
 419
 420   /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
 421      mean either a serial port on a terminal server, or the IP address of a
 422      SPARClite demo board.  If there's no colon, then it pretty much has to be
 423      a local device (except for DOS... grrmble) */
 424
 425   p = strchr (name, ' ');
 426
 427   if (p)
 428     {
 429       *p++ = '\000';
 430       while ((*p != '\000') && isspace (*p))
 431         p++;
 432
 433       if (strncmp (name, "serial", strlen (name)) == 0)
 434         serial_flag = 1;
 435       else if (strncmp (name, "udp", strlen (name)) == 0)
 436         serial_flag = 0;
 437       else
 438         error ("Must specify either `serial' or `udp'.");
 439     }
 440   else
 441     {
 442       p = name;
 443
 444       if (!strchr (name, ':'))
 445         serial_flag = 1;        /* No colon is unambiguous (local device) */
 446       else
 447         error ("Usage: target sparclite serial /dev/ttyb\n\
 448 or: target sparclite udp host");
 449     }
 450
 451   if (serial_flag)
 452     {
 453       remote_desc = open_tty (p);
 454
 455       old_chain = make_cleanup (close_tty, 0 /*ignore*/);
 456
 457       c = send_resp (remote_desc, 0x00);
 458
 459       if (c != 0xaa)
 460         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 461                c);
 462
 463       c = send_resp (remote_desc, 0x55);
 464
 465       if (c != 0x55)
 466         error ("Sparclite appears to be ill.");
 467     }
 468   else
 469     {
 470 #ifdef HAVE_SOCKETS
 471       struct hostent *he;
 472       struct sockaddr_in sockaddr;
 473       unsigned char buffer[100];
 474       int cc;
 475
 476       /* Setup the socket.  Must be raw UDP. */
 477
 478       he = gethostbyname (p);
 479
 480       if (!he)
 481         error ("No such host %s.", p);
 482
 483       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 484
 485       old_chain = make_cleanup (close, udp_fd);
 486
 487       sockaddr.sin_family = PF_INET;
 488       sockaddr.sin_port = htons (7000);
 489       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 490
 491       if (connect (udp_fd, &sockaddr, sizeof (sockaddr)))
 492         perror_with_name ("Connect failed");
 493
 494       buffer[0] = 0x5;
 495       buffer[1] = 0;
 496
 497       send_udp_buf (udp_fd, buffer, 2);         /* Request version */
 498       cc = recv_udp_buf (udp_fd, buffer, sizeof (buffer), 5);   /* Get response */
 499       if (cc == 0)
 500         error ("SPARClite isn't responding.");
 501
 502       if (cc < 3)
 503         error ("SPARClite appears to be ill.");
 504 #else
 505       error ("UDP downloading is not supported for DOS hosts.");
 506 #endif /* HAVE_SOCKETS */
 507     }
 508
 509   printf_unfiltered ("[SPARClite appears to be alive]\n");
 510
 511   push_target (&sparclite_ops);
 512
 513   discard_cleanups (old_chain);
 514
 515   return;
 516 }
 517
 518 static void
 519 sparclite_close (int quitting)
 520 {
 521   if (serial_flag)
 522     close_tty (0);
 523 #ifdef HAVE_SOCKETS
 524   else if (udp_fd != -1)
 525     close (udp_fd);
 526 #endif
 527 }
 528
 529 #define LOAD_ADDRESS 0x40000000
 530
 531 static void
 532 download (char *target_name, char *args, int from_tty,
 533           void (*write_routine) (bfd *from_bfd, asection *from_sec,
 534                                  file_ptr from_addr, bfd_vma to_addr, int len),
 535           void (*start_routine) (bfd_vma entry))
 536 {
 537   struct cleanup *old_chain;
 538   asection *section;
 539   bfd *pbfd;
 540   bfd_vma entry;
 541   int i;
 542 #define WRITESIZE 1024
 543   char *filename;
 544   int quiet;
 545   int nostart;
 546
 547   quiet = 0;
 548   nostart = 0;
 549   filename = NULL;
 550
 551   while (*args != '\000')
 552     {
 553       char *arg;
 554
 555       while (isspace (*args))
 556         args++;
 557
 558       arg = args;
 559
 560       while ((*args != '\000') && !isspace (*args))
 561         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           const char *section_name;
 599
 600           section_name = bfd_get_section_name (pbfd, section);
 601
 602           section_address = bfd_get_section_vma (pbfd, section);
 603
 604           /* Adjust sections from a.out files, since they don't
 605              carry their addresses with.  */
 606           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 607             {
 608               if (strcmp (section_name, ".text") == 0)
 609                 section_address = bfd_get_start_address (pbfd);
 610               else if (strcmp (section_name, ".data") == 0)
 611                 {
 612                   /* Read the first 8 bytes of the data section.
 613                      There should be the string 'DaTa' followed by
 614                      a word containing the actual section address. */
 615                   struct data_marker
 616                     {
 617                       char signature[4];        /* 'DaTa' */
 618                       unsigned char sdata[4];   /* &sdata */
 619                     }
 620                   marker;
 621                   bfd_get_section_contents (pbfd, section, &marker, 0,
 622                                             sizeof (marker));
 623                   if (strncmp (marker.signature, "DaTa", 4) == 0)
 624                     {
 625                       if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
 626                         section_address = bfd_getb32 (marker.sdata);
 627                       else
 628                         section_address = bfd_getl32 (marker.sdata);
 629                     }
 630                 }
 631             }
 632
 633           section_size = bfd_get_section_size_before_reloc (section);
 634
 635           if (!quiet)
 636             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 637                              bfd_get_section_name (pbfd, section),
 638                              section_address,
 639                              section_size);
 640
 641           fptr = 0;
 642           while (section_size > 0)
 643             {
 644               int count;
 645               static char inds[] = "|/-\\";
 646               static int k = 0;
 647
 648               QUIT;
 649
 650               count = min (section_size, WRITESIZE);
 651
 652               write_routine (pbfd, section, fptr, section_address, count);
 653
 654               if (!quiet)
 655                 {
 656                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 657                   gdb_flush (gdb_stdout);
 658                 }
 659
 660               section_address += count;
 661               fptr += count;
 662               section_size -= count;
 663             }
 664         }
 665     }
 666
 667   if (!nostart)
 668     {
 669       entry = bfd_get_start_address (pbfd);
 670
 671       if (!quiet)
 672         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 673
 674       start_routine (entry);
 675     }
 676
 677   do_cleanups (old_chain);
 678 }
 679
 680 static void
 681 sparclite_serial_start (bfd_vma entry)
 682 {
 683   char buffer[5];
 684   int i;
 685
 686   buffer[0] = 0x03;
 687   store_unsigned_integer (buffer + 1, 4, entry);
 688
 689   debug_serial_write (remote_desc, buffer, 1 + 4);
 690   i = readchar (remote_desc, remote_timeout);
 691   if (i != 0x55)
 692     error ("Can't start SparcLite.  Error code %d\n", i);
 693 }
 694
 695 static void
 696 sparclite_serial_write (bfd *from_bfd, asection *from_sec, file_ptr from_addr,
 697                         bfd_vma to_addr, int len)
 698 {
 699   char buffer[4 + 4 + WRITESIZE];       /* addr + len + data */
 700   unsigned char checksum;
 701   int i;
 702
 703   store_unsigned_integer (buffer, 4, to_addr);  /* Address */
 704   store_unsigned_integer (buffer + 4, 4, len);  /* Length */
 705
 706   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 707
 708   checksum = 0;
 709   for (i = 0; i < len; i++)
 710     checksum += buffer[8 + i];
 711
 712   i = send_resp (remote_desc, 0x01);
 713
 714   if (i != 0x5a)
 715     error ("Bad response from load command (0x%x)", i);
 716
 717   debug_serial_write (remote_desc, buffer, 4 + 4 + len);
 718   i = readchar (remote_desc, remote_timeout);
 719
 720   if (i != checksum)
 721     error ("Bad checksum from load command (0x%x)", i);
 722 }
 723
 724 #ifdef HAVE_SOCKETS
 725
 726 static unsigned short
 727 calc_checksum (unsigned char *buffer, int count)
 728 {
 729   unsigned short checksum;
 730
 731   checksum = 0;
 732   for (; count > 0; count -= 2, buffer += 2)
 733     checksum += (*buffer << 8) | *(buffer + 1);
 734
 735   if (count != 0)
 736     checksum += *buffer << 8;
 737
 738   return checksum;
 739 }
 740
 741 static void
 742 sparclite_udp_start (bfd_vma entry)
 743 {
 744   unsigned char buffer[6];
 745   int i;
 746
 747   buffer[0] = 0x3;
 748   buffer[1] = 0;
 749   buffer[2] = entry >> 24;
 750   buffer[3] = entry >> 16;
 751   buffer[4] = entry >> 8;
 752   buffer[5] = entry;
 753
 754   send_udp_buf (udp_fd, buffer, 6);     /* Send start addr */
 755   i = recv_udp_buf (udp_fd, buffer, sizeof (buffer), -1);       /* Get response */
 756
 757   if (i < 1 || buffer[0] != 0x55)
 758     error ("Failed to take start address.");
 759 }
 760
 761 static void
 762 sparclite_udp_write (bfd *from_bfd, asection *from_sec, file_ptr from_addr,
 763                      bfd_vma to_addr, int len)
 764 {
 765   unsigned char buffer[2000];
 766   unsigned short checksum;
 767   static int pkt_num = 0;
 768   static unsigned long old_addr = -1;
 769   int i;
 770
 771   while (1)
 772     {
 773       if (to_addr != old_addr)
 774         {
 775           buffer[0] = 0x1;      /* Load command */
 776           buffer[1] = 0x1;      /* Loading address */
 777           buffer[2] = to_addr >> 24;
 778           buffer[3] = to_addr >> 16;
 779           buffer[4] = to_addr >> 8;
 780           buffer[5] = to_addr;
 781
 782           checksum = 0;
 783           for (i = 0; i < 6; i++)
 784             checksum += buffer[i];
 785           checksum &= 0xff;
 786
 787           send_udp_buf (udp_fd, buffer, 6);
 788           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 789
 790           if (i < 1)
 791             error ("Got back short checksum for load addr.");
 792
 793           if (checksum != buffer[0])
 794             error ("Got back bad checksum for load addr.");
 795
 796           pkt_num = 0;          /* Load addr resets packet seq # */
 797           old_addr = to_addr;
 798         }
 799
 800       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 801                                 len);
 802
 803       checksum = calc_checksum (buffer + 6, len);
 804
 805       buffer[0] = 0x1;          /* Load command */
 806       buffer[1] = 0x2;          /* Loading data */
 807       buffer[2] = pkt_num >> 8;
 808       buffer[3] = pkt_num;
 809       buffer[4] = checksum >> 8;
 810       buffer[5] = checksum;
 811
 812       send_udp_buf (udp_fd, buffer, len + 6);
 813       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 814
 815       if (i == 0)
 816         {
 817           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 818           continue;
 819         }
 820
 821       if (buffer[0] != 0xff)
 822         error ("Got back bad response for load data.");
 823
 824       old_addr += len;
 825       pkt_num++;
 826
 827       return;
 828     }
 829 }
 830
 831 #endif /* HAVE_SOCKETS */
 832
 833 static void
 834 sparclite_download (char *filename, int from_tty)
 835 {
 836   if (!serial_flag)
 837 #ifdef HAVE_SOCKETS
 838     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 839               sparclite_udp_start);
 840 #else
 841     internal_error (__FILE__, __LINE__, "failed internal consistency check");                   /* sparclite_open should prevent this! */
 842 #endif
 843   else
 844     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 845               sparclite_serial_start);
 846 }
 847 \f
 848 /* Set up the sparclite target vector.  */
 849
 850 static void
 851 init_sparclite_ops (void)
 852 {
 853   sparclite_ops.to_shortname = "sparclite";
 854   sparclite_ops.to_longname = "SPARClite download target";
 855   sparclite_ops.to_doc = "Download to a remote SPARClite target board via serial of UDP.\n\
 856 Specify the device it is connected to (e.g. /dev/ttya).";
 857   sparclite_ops.to_open = sparclite_open;
 858   sparclite_ops.to_close = sparclite_close;
 859   sparclite_ops.to_load = sparclite_download;
 860   sparclite_ops.to_stratum = download_stratum;
 861   sparclite_ops.to_magic = OPS_MAGIC;
 862 }
 863
 864 void
 865 _initialize_sparcl_tdep (void)
 866 {
 867   init_sparclite_ops ();
 868   add_target (&sparclite_ops);
 869 }