gdb/sparcl-tdep.c

   1 /* Target dependent code for the Fujitsu SPARClite for GDB, the GNU debugger.
   2    Copyright 1994, 1995, 1996, 1999, 2001  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 (CORE_ADDR addr, int len, int type)
  95 {
  96   CORE_ADDR dcr;
  97
  98   dcr = read_register (DCR_REGNUM);
  99
 100   if (!(dcr & DDA1_ENABLE))
 101     {
 102       write_register (DDA1_REGNUM, addr);
 103       dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK);
 104       dcr |= (DDA1_SUP_ASI | DDA1_ENABLE);
 105       if (type == 1)
 106         {
 107           write_register (DDV1_REGNUM, 0);
 108           write_register (DDV2_REGNUM, 0xffffffff);
 109           dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK));
 110         }
 111       else if (type == 0)
 112         {
 113           write_register (DDV1_REGNUM, 0);
 114           write_register (DDV2_REGNUM, 0xffffffff);
 115           dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK));
 116         }
 117       else
 118         {
 119           write_register (DDV1_REGNUM, 0);
 120           write_register (DDV2_REGNUM, 0xffffffff);
 121           dcr |= (DDV_TYPE_ACCESS);
 122         }
 123       write_register (DCR_REGNUM, dcr);
 124     }
 125   else if (!(dcr & DDA2_ENABLE))
 126     {
 127       write_register (DDA2_REGNUM, addr);
 128       dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK);
 129       dcr |= (DDA2_SUP_ASI | DDA2_ENABLE);
 130       if (type == 1)
 131         {
 132           write_register (DDV1_REGNUM, 0);
 133           write_register (DDV2_REGNUM, 0xffffffff);
 134           dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK);
 135         }
 136       else if (type == 0)
 137         {
 138           write_register (DDV1_REGNUM, 0);
 139           write_register (DDV2_REGNUM, 0xffffffff);
 140           dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK);
 141         }
 142       else
 143         {
 144           write_register (DDV1_REGNUM, 0);
 145           write_register (DDV2_REGNUM, 0xffffffff);
 146           dcr |= (DDV_TYPE_ACCESS);
 147         }
 148       write_register (DCR_REGNUM, dcr);
 149     }
 150   else
 151     return -1;
 152
 153   return 0;
 154 }
 155
 156 int
 157 sparclite_remove_watchpoint (CORE_ADDR addr, int len, int type)
 158 {
 159   CORE_ADDR dcr, dda1, dda2;
 160
 161   dcr = read_register (DCR_REGNUM);
 162   dda1 = read_register (DDA1_REGNUM);
 163   dda2 = read_register (DDA2_REGNUM);
 164
 165   if ((dcr & DDA1_ENABLE) && addr == dda1)
 166     write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE));
 167   else if ((dcr & DDA2_ENABLE) && addr == dda2)
 168     write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE));
 169   else
 170     return -1;
 171
 172   return 0;
 173 }
 174
 175 int
 176 sparclite_insert_hw_breakpoint (CORE_ADDR addr, int len)
 177 {
 178   CORE_ADDR dcr;
 179
 180   dcr = read_register (DCR_REGNUM);
 181
 182   if (!(dcr & DIA1_ENABLE))
 183     {
 184       write_register (DIA1_REGNUM, addr);
 185       write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE));
 186     }
 187   else if (!(dcr & DIA2_ENABLE))
 188     {
 189       write_register (DIA2_REGNUM, addr);
 190       write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE));
 191     }
 192   else
 193     return -1;
 194
 195   return 0;
 196 }
 197
 198 int
 199 sparclite_remove_hw_breakpoint (CORE_ADDR addr, int shadow)
 200 {
 201   CORE_ADDR dcr, dia1, dia2;
 202
 203   dcr = read_register (DCR_REGNUM);
 204   dia1 = read_register (DIA1_REGNUM);
 205   dia2 = read_register (DIA2_REGNUM);
 206
 207   if ((dcr & DIA1_ENABLE) && addr == dia1)
 208     write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE));
 209   else if ((dcr & DIA2_ENABLE) && addr == dia2)
 210     write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE));
 211   else
 212     return -1;
 213
 214   return 0;
 215 }
 216
 217 int
 218 sparclite_check_watch_resources (int type, int cnt, int ot)
 219 {
 220   /* Watchpoints not supported on simulator.  */
 221   if (strcmp (target_shortname, "sim") == 0)
 222     return 0;
 223
 224   if (type == bp_hardware_breakpoint)
 225     {
 226       if (TARGET_HW_BREAK_LIMIT == 0)
 227         return 0;
 228       else if (cnt <= TARGET_HW_BREAK_LIMIT)
 229         return 1;
 230     }
 231   else
 232     {
 233       if (TARGET_HW_WATCH_LIMIT == 0)
 234         return 0;
 235       else if (ot)
 236         return -1;
 237       else if (cnt <= TARGET_HW_WATCH_LIMIT)
 238         return 1;
 239     }
 240   return -1;
 241 }
 242
 243 CORE_ADDR
 244 sparclite_stopped_data_address (void)
 245 {
 246   CORE_ADDR dsr, dda1, dda2;
 247
 248   dsr = read_register (DSR_REGNUM);
 249   dda1 = read_register (DDA1_REGNUM);
 250   dda2 = read_register (DDA2_REGNUM);
 251
 252   if (dsr & 0x10)
 253     return dda1;
 254   else if (dsr & 0x20)
 255     return dda2;
 256   else
 257     return 0;
 258 }
 259 \f
 260 static serial_t
 261 open_tty (char *name)
 262 {
 263   serial_t desc;
 264
 265   desc = SERIAL_OPEN (name);
 266   if (!desc)
 267     perror_with_name (name);
 268
 269   if (baud_rate != -1)
 270     {
 271       if (SERIAL_SETBAUDRATE (desc, baud_rate))
 272         {
 273           SERIAL_CLOSE (desc);
 274           perror_with_name (name);
 275         }
 276     }
 277
 278   SERIAL_RAW (desc);
 279
 280   SERIAL_FLUSH_INPUT (desc);
 281
 282   return desc;
 283 }
 284
 285 /* Read a single character from the remote end, masking it down to 7 bits. */
 286
 287 static int
 288 readchar (serial_t desc, int timeout)
 289 {
 290   int ch;
 291   char s[10];
 292
 293   ch = SERIAL_READCHAR (desc, timeout);
 294
 295   switch (ch)
 296     {
 297     case SERIAL_EOF:
 298       error ("SPARClite remote connection closed");
 299     case SERIAL_ERROR:
 300       perror_with_name ("SPARClite communication error");
 301     case SERIAL_TIMEOUT:
 302       error ("SPARClite remote timeout");
 303     default:
 304       if (remote_debug > 0)
 305         {
 306           sprintf (s, "[%02x]", ch & 0xff);
 307           puts_debug ("read -->", s, "<--");
 308         }
 309       return ch;
 310     }
 311 }
 312
 313 static void
 314 debug_serial_write (serial_t desc, char *buf, int len)
 315 {
 316   char s[10];
 317
 318   SERIAL_WRITE (desc, buf, len);
 319   if (remote_debug > 0)
 320     {
 321       while (len-- > 0)
 322         {
 323           sprintf (s, "[%02x]", *buf & 0xff);
 324           puts_debug ("Sent -->", s, "<--");
 325           buf++;
 326         }
 327     }
 328 }
 329
 330
 331 static int
 332 send_resp (serial_t desc, char c)
 333 {
 334   debug_serial_write (desc, &c, 1);
 335   return readchar (desc, remote_timeout);
 336 }
 337
 338 static void
 339 close_tty (void *ignore)
 340 {
 341   if (!remote_desc)
 342     return;
 343
 344   SERIAL_CLOSE (remote_desc);
 345
 346   remote_desc = NULL;
 347 }
 348
 349 #ifdef HAVE_SOCKETS
 350 static int
 351 recv_udp_buf (int fd, unsigned char *buf, int len, int timeout)
 352 {
 353   int cc;
 354   fd_set readfds;
 355
 356   FD_ZERO (&readfds);
 357   FD_SET (fd, &readfds);
 358
 359   if (timeout >= 0)
 360     {
 361       struct timeval timebuf;
 362
 363       timebuf.tv_sec = timeout;
 364       timebuf.tv_usec = 0;
 365       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 366     }
 367   else
 368     cc = select (fd + 1, &readfds, 0, 0, 0);
 369
 370   if (cc == 0)
 371     return 0;
 372
 373   if (cc != 1)
 374     perror_with_name ("recv_udp_buf: Bad return value from select:");
 375
 376   cc = recv (fd, buf, len, 0);
 377
 378   if (cc < 0)
 379     perror_with_name ("Got an error from recv: ");
 380 }
 381
 382 static int
 383 send_udp_buf (int fd, unsigned char *buf, int len)
 384 {
 385   int cc;
 386
 387   cc = send (fd, buf, len, 0);
 388
 389   if (cc == len)
 390     return;
 391
 392   if (cc < 0)
 393     perror_with_name ("Got an error from send: ");
 394
 395   error ("Short count in send: tried %d, sent %d\n", len, cc);
 396 }
 397 #endif /* HAVE_SOCKETS */
 398
 399 static void
 400 sparclite_open (char *name, 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     xfree (remote_target_name);
 415
 416   remote_target_name = xstrdup (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))
 429         p++;
 430
 431       if (strncmp (name, "serial", strlen (name)) == 0)
 432         serial_flag = 1;
 433       else if (strncmp (name, "udp", strlen (name)) == 0)
 434         serial_flag = 0;
 435       else
 436         error ("Must specify either `serial' or `udp'.");
 437     }
 438   else
 439     {
 440       p = name;
 441
 442       if (!strchr (name, ':'))
 443         serial_flag = 1;        /* No colon is unambiguous (local device) */
 444       else
 445         error ("Usage: target sparclite serial /dev/ttyb\n\
 446 or: target sparclite udp host");
 447     }
 448
 449   if (serial_flag)
 450     {
 451       remote_desc = open_tty (p);
 452
 453       old_chain = make_cleanup (close_tty, 0 /*ignore*/);
 454
 455       c = send_resp (remote_desc, 0x00);
 456
 457       if (c != 0xaa)
 458         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 459                c);
 460
 461       c = send_resp (remote_desc, 0x55);
 462
 463       if (c != 0x55)
 464         error ("Sparclite appears to be ill.");
 465     }
 466   else
 467     {
 468 #ifdef HAVE_SOCKETS
 469       struct hostent *he;
 470       struct sockaddr_in sockaddr;
 471       unsigned char buffer[100];
 472       int cc;
 473
 474       /* Setup the socket.  Must be raw UDP. */
 475
 476       he = gethostbyname (p);
 477
 478       if (!he)
 479         error ("No such host %s.", p);
 480
 481       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 482
 483       old_chain = make_cleanup (close, udp_fd);
 484
 485       sockaddr.sin_family = PF_INET;
 486       sockaddr.sin_port = htons (7000);
 487       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 488
 489       if (connect (udp_fd, &sockaddr, sizeof (sockaddr)))
 490         perror_with_name ("Connect failed");
 491
 492       buffer[0] = 0x5;
 493       buffer[1] = 0;
 494
 495       send_udp_buf (udp_fd, buffer, 2);         /* Request version */
 496       cc = recv_udp_buf (udp_fd, buffer, sizeof (buffer), 5);   /* Get response */
 497       if (cc == 0)
 498         error ("SPARClite isn't responding.");
 499
 500       if (cc < 3)
 501         error ("SPARClite appears to be ill.");
 502 #else
 503       error ("UDP downloading is not supported for DOS hosts.");
 504 #endif /* HAVE_SOCKETS */
 505     }
 506
 507   printf_unfiltered ("[SPARClite appears to be alive]\n");
 508
 509   push_target (&sparclite_ops);
 510
 511   discard_cleanups (old_chain);
 512
 513   return;
 514 }
 515
 516 static void
 517 sparclite_close (int quitting)
 518 {
 519   if (serial_flag)
 520     close_tty (0);
 521 #ifdef HAVE_SOCKETS
 522   else if (udp_fd != -1)
 523     close (udp_fd);
 524 #endif
 525 }
 526
 527 #define LOAD_ADDRESS 0x40000000
 528
 529 static void
 530 download (char *target_name, char *args, int from_tty,
 531           void (*write_routine) (bfd *from_bfd, asection *from_sec,
 532                                  file_ptr from_addr, bfd_vma to_addr, int len),
 533           void (*start_routine) (bfd_vma entry))
 534 {
 535   struct cleanup *old_chain;
 536   asection *section;
 537   bfd *pbfd;
 538   bfd_vma entry;
 539   int i;
 540 #define WRITESIZE 1024
 541   char *filename;
 542   int quiet;
 543   int nostart;
 544
 545   quiet = 0;
 546   nostart = 0;
 547   filename = NULL;
 548
 549   while (*args != '\000')
 550     {
 551       char *arg;
 552
 553       while (isspace (*args))
 554         args++;
 555
 556       arg = args;
 557
 558       while ((*args != '\000') && !isspace (*args))
 559         args++;
 560
 561       if (*args != '\000')
 562         *args++ = '\000';
 563
 564       if (*arg != '-')
 565         filename = arg;
 566       else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
 567         quiet = 1;
 568       else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
 569         nostart = 1;
 570       else
 571         error ("unknown option `%s'", arg);
 572     }
 573
 574   if (!filename)
 575     filename = get_exec_file (1);
 576
 577   pbfd = bfd_openr (filename, gnutarget);
 578   if (pbfd == NULL)
 579     {
 580       perror_with_name (filename);
 581       return;
 582     }
 583   old_chain = make_cleanup_bfd_close (pbfd);
 584
 585   if (!bfd_check_format (pbfd, bfd_object))
 586     error ("\"%s\" is not an object file: %s", filename,
 587            bfd_errmsg (bfd_get_error ()));
 588
 589   for (section = pbfd->sections; section; section = section->next)
 590     {
 591       if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
 592         {
 593           bfd_vma section_address;
 594           bfd_size_type section_size;
 595           file_ptr fptr;
 596           const char *section_name;
 597
 598           section_name = bfd_get_section_name (pbfd, section);
 599
 600           section_address = bfd_get_section_vma (pbfd, section);
 601
 602           /* Adjust sections from a.out files, since they don't
 603              carry their addresses with.  */
 604           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 605             {
 606               if (strcmp (section_name, ".text") == 0)
 607                 section_address = bfd_get_start_address (pbfd);
 608               else if (strcmp (section_name, ".data") == 0)
 609                 {
 610                   /* Read the first 8 bytes of the data section.
 611                      There should be the string 'DaTa' followed by
 612                      a word containing the actual section address. */
 613                   struct data_marker
 614                     {
 615                       char signature[4];        /* 'DaTa' */
 616                       unsigned char sdata[4];   /* &sdata */
 617                     }
 618                   marker;
 619                   bfd_get_section_contents (pbfd, section, &marker, 0,
 620                                             sizeof (marker));
 621                   if (strncmp (marker.signature, "DaTa", 4) == 0)
 622                     {
 623                       if (TARGET_BYTE_ORDER == BIG_ENDIAN)
 624                         section_address = bfd_getb32 (marker.sdata);
 625                       else
 626                         section_address = bfd_getl32 (marker.sdata);
 627                     }
 628                 }
 629             }
 630
 631           section_size = bfd_get_section_size_before_reloc (section);
 632
 633           if (!quiet)
 634             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 635                              bfd_get_section_name (pbfd, section),
 636                              section_address,
 637                              section_size);
 638
 639           fptr = 0;
 640           while (section_size > 0)
 641             {
 642               int count;
 643               static char inds[] = "|/-\\";
 644               static int k = 0;
 645
 646               QUIT;
 647
 648               count = min (section_size, WRITESIZE);
 649
 650               write_routine (pbfd, section, fptr, section_address, count);
 651
 652               if (!quiet)
 653                 {
 654                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 655                   gdb_flush (gdb_stdout);
 656                 }
 657
 658               section_address += count;
 659               fptr += count;
 660               section_size -= count;
 661             }
 662         }
 663     }
 664
 665   if (!nostart)
 666     {
 667       entry = bfd_get_start_address (pbfd);
 668
 669       if (!quiet)
 670         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 671
 672       start_routine (entry);
 673     }
 674
 675   do_cleanups (old_chain);
 676 }
 677
 678 static void
 679 sparclite_serial_start (bfd_vma entry)
 680 {
 681   char buffer[5];
 682   int i;
 683
 684   buffer[0] = 0x03;
 685   store_unsigned_integer (buffer + 1, 4, entry);
 686
 687   debug_serial_write (remote_desc, buffer, 1 + 4);
 688   i = readchar (remote_desc, remote_timeout);
 689   if (i != 0x55)
 690     error ("Can't start SparcLite.  Error code %d\n", i);
 691 }
 692
 693 static void
 694 sparclite_serial_write (bfd *from_bfd, asection *from_sec, file_ptr from_addr,
 695                         bfd_vma to_addr, int len)
 696 {
 697   char buffer[4 + 4 + WRITESIZE];       /* addr + len + data */
 698   unsigned char checksum;
 699   int i;
 700
 701   store_unsigned_integer (buffer, 4, to_addr);  /* Address */
 702   store_unsigned_integer (buffer + 4, 4, len);  /* Length */
 703
 704   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 705
 706   checksum = 0;
 707   for (i = 0; i < len; i++)
 708     checksum += buffer[8 + i];
 709
 710   i = send_resp (remote_desc, 0x01);
 711
 712   if (i != 0x5a)
 713     error ("Bad response from load command (0x%x)", i);
 714
 715   debug_serial_write (remote_desc, buffer, 4 + 4 + len);
 716   i = readchar (remote_desc, remote_timeout);
 717
 718   if (i != checksum)
 719     error ("Bad checksum from load command (0x%x)", i);
 720 }
 721
 722 #ifdef HAVE_SOCKETS
 723
 724 static unsigned short
 725 calc_checksum (unsigned char *buffer, int count)
 726 {
 727   unsigned short checksum;
 728
 729   checksum = 0;
 730   for (; count > 0; count -= 2, buffer += 2)
 731     checksum += (*buffer << 8) | *(buffer + 1);
 732
 733   if (count != 0)
 734     checksum += *buffer << 8;
 735
 736   return checksum;
 737 }
 738
 739 static void
 740 sparclite_udp_start (bfd_vma entry)
 741 {
 742   unsigned char buffer[6];
 743   int i;
 744
 745   buffer[0] = 0x3;
 746   buffer[1] = 0;
 747   buffer[2] = entry >> 24;
 748   buffer[3] = entry >> 16;
 749   buffer[4] = entry >> 8;
 750   buffer[5] = entry;
 751
 752   send_udp_buf (udp_fd, buffer, 6);     /* Send start addr */
 753   i = recv_udp_buf (udp_fd, buffer, sizeof (buffer), -1);       /* Get response */
 754
 755   if (i < 1 || buffer[0] != 0x55)
 756     error ("Failed to take start address.");
 757 }
 758
 759 static void
 760 sparclite_udp_write (bfd *from_bfd, asection *from_sec, file_ptr from_addr,
 761                      bfd_vma to_addr, int len)
 762 {
 763   unsigned char buffer[2000];
 764   unsigned short checksum;
 765   static int pkt_num = 0;
 766   static unsigned long old_addr = -1;
 767   int i;
 768
 769   while (1)
 770     {
 771       if (to_addr != old_addr)
 772         {
 773           buffer[0] = 0x1;      /* Load command */
 774           buffer[1] = 0x1;      /* Loading address */
 775           buffer[2] = to_addr >> 24;
 776           buffer[3] = to_addr >> 16;
 777           buffer[4] = to_addr >> 8;
 778           buffer[5] = to_addr;
 779
 780           checksum = 0;
 781           for (i = 0; i < 6; i++)
 782             checksum += buffer[i];
 783           checksum &= 0xff;
 784
 785           send_udp_buf (udp_fd, buffer, 6);
 786           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 787
 788           if (i < 1)
 789             error ("Got back short checksum for load addr.");
 790
 791           if (checksum != buffer[0])
 792             error ("Got back bad checksum for load addr.");
 793
 794           pkt_num = 0;          /* Load addr resets packet seq # */
 795           old_addr = to_addr;
 796         }
 797
 798       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 799                                 len);
 800
 801       checksum = calc_checksum (buffer + 6, len);
 802
 803       buffer[0] = 0x1;          /* Load command */
 804       buffer[1] = 0x2;          /* Loading data */
 805       buffer[2] = pkt_num >> 8;
 806       buffer[3] = pkt_num;
 807       buffer[4] = checksum >> 8;
 808       buffer[5] = checksum;
 809
 810       send_udp_buf (udp_fd, buffer, len + 6);
 811       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 812
 813       if (i == 0)
 814         {
 815           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 816           continue;
 817         }
 818
 819       if (buffer[0] != 0xff)
 820         error ("Got back bad response for load data.");
 821
 822       old_addr += len;
 823       pkt_num++;
 824
 825       return;
 826     }
 827 }
 828
 829 #endif /* HAVE_SOCKETS */
 830
 831 static void
 832 sparclite_download (char *filename, int from_tty)
 833 {
 834   if (!serial_flag)
 835 #ifdef HAVE_SOCKETS
 836     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 837               sparclite_udp_start);
 838 #else
 839     abort ();                   /* sparclite_open should prevent this! */
 840 #endif
 841   else
 842     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 843               sparclite_serial_start);
 844 }
 845 \f
 846 /* Set up the sparclite target vector.  */
 847
 848 static void
 849 init_sparclite_ops (void)
 850 {
 851   sparclite_ops.to_shortname = "sparclite";
 852   sparclite_ops.to_longname = "SPARClite download target";
 853   sparclite_ops.to_doc = "Download to a remote SPARClite target board via serial of UDP.\n\
 854 Specify the device it is connected to (e.g. /dev/ttya).";
 855   sparclite_ops.to_open = sparclite_open;
 856   sparclite_ops.to_close = sparclite_close;
 857   sparclite_ops.to_load = sparclite_download;
 858   sparclite_ops.to_stratum = download_stratum;
 859   sparclite_ops.to_magic = OPS_MAGIC;
 860 }
 861
 862 void
 863 _initialize_sparcl_tdep (void)
 864 {
 865   init_sparclite_ops ();
 866   add_target (&sparclite_ops);
 867 }