gdb/sparcl-tdep.c

   1 /* Target dependent code for the Fujitsu SPARClite for GDB, the GNU debugger.
   2    Copyright 1994, 1995, 1996, 1999  Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "gdbcore.h"
  23 #include "breakpoint.h"
  24 #include "target.h"
  25 #include "serial.h"
  26 #include <sys/types.h>
  27
  28 #if (!defined(__GO32__) && !defined(_WIN32)) || defined(__CYGWIN32__)
  29 #define HAVE_SOCKETS
  30 #include <sys/time.h>
  31 #include <sys/socket.h>
  32 #include <netinet/in.h>
  33 #include <netdb.h>
  34 #endif
  35
  36 static struct target_ops sparclite_ops;
  37
  38 static char *remote_target_name = NULL;
  39 static serial_t remote_desc = NULL;
  40 static int serial_flag;
  41 #ifdef HAVE_SOCKETS
  42 static int udp_fd = -1;
  43 #endif
  44
  45 static serial_t open_tty PARAMS ((char *name));
  46 static int send_resp PARAMS ((serial_t desc, char c));
  47 static void close_tty (void * ignore);
  48 #ifdef HAVE_SOCKETS
  49 static int recv_udp_buf PARAMS ((int fd, unsigned char *buf, int len, int timeout));
  50 static int send_udp_buf PARAMS ((int fd, unsigned char *buf, int len));
  51 #endif
  52 static void sparclite_open PARAMS ((char *name, int from_tty));
  53 static void sparclite_close PARAMS ((int quitting));
  54 static void download PARAMS ((char *target_name, char *args, int from_tty,
  55                               void (*write_routine) (bfd * from_bfd,
  56                                                      asection * from_sec,
  57                                                      file_ptr from_addr,
  58                                                   bfd_vma to_addr, int len),
  59                               void (*start_routine) (bfd_vma entry)));
  60 static void sparclite_serial_start PARAMS ((bfd_vma entry));
  61 static void sparclite_serial_write PARAMS ((bfd * from_bfd, asection * from_sec,
  62                                             file_ptr from_addr,
  63                                             bfd_vma to_addr, int len));
  64 #ifdef HAVE_SOCKETS
  65 static unsigned short calc_checksum PARAMS ((unsigned char *buffer,
  66                                              int count));
  67 static void sparclite_udp_start PARAMS ((bfd_vma entry));
  68 static void sparclite_udp_write PARAMS ((bfd * from_bfd, asection * from_sec,
  69                                          file_ptr from_addr, bfd_vma to_addr,
  70                                          int len));
  71 #endif
  72 static void sparclite_download PARAMS ((char *filename, int from_tty));
  73
  74 #define DDA2_SUP_ASI            0xb000000
  75 #define DDA1_SUP_ASI            0xb0000
  76
  77 #define DDA2_ASI_MASK           0xff000000
  78 #define DDA1_ASI_MASK           0xff0000
  79 #define DIA2_SUP_MODE           0x8000
  80 #define DIA1_SUP_MODE           0x4000
  81 #define DDA2_ENABLE             0x100
  82 #define DDA1_ENABLE             0x80
  83 #define DIA2_ENABLE             0x40
  84 #define DIA1_ENABLE             0x20
  85 #define DSINGLE_STEP            0x10    /* not used */
  86 #define DDV_TYPE_MASK           0xc
  87 #define DDV_TYPE_LOAD           0x0
  88 #define DDV_TYPE_STORE          0x4
  89 #define DDV_TYPE_ACCESS         0x8
  90 #define DDV_TYPE_ALWAYS         0xc
  91 #define DDV_COND                0x2
  92 #define DDV_MASK                0x1
  93
  94 int
  95 sparclite_insert_watchpoint (addr, len, type)
  96      CORE_ADDR addr;
  97      int len;
  98      int type;
  99 {
 100   CORE_ADDR dcr;
 101
 102   dcr = read_register (DCR_REGNUM);
 103
 104   if (!(dcr & DDA1_ENABLE))
 105     {
 106       write_register (DDA1_REGNUM, addr);
 107       dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK);
 108       dcr |= (DDA1_SUP_ASI | DDA1_ENABLE);
 109       if (type == 1)
 110         {
 111           write_register (DDV1_REGNUM, 0);
 112           write_register (DDV2_REGNUM, 0xffffffff);
 113           dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK));
 114         }
 115       else if (type == 0)
 116         {
 117           write_register (DDV1_REGNUM, 0);
 118           write_register (DDV2_REGNUM, 0xffffffff);
 119           dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK));
 120         }
 121       else
 122         {
 123           write_register (DDV1_REGNUM, 0);
 124           write_register (DDV2_REGNUM, 0xffffffff);
 125           dcr |= (DDV_TYPE_ACCESS);
 126         }
 127       write_register (DCR_REGNUM, dcr);
 128     }
 129   else if (!(dcr & DDA2_ENABLE))
 130     {
 131       write_register (DDA2_REGNUM, addr);
 132       dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK);
 133       dcr |= (DDA2_SUP_ASI | DDA2_ENABLE);
 134       if (type == 1)
 135         {
 136           write_register (DDV1_REGNUM, 0);
 137           write_register (DDV2_REGNUM, 0xffffffff);
 138           dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK);
 139         }
 140       else if (type == 0)
 141         {
 142           write_register (DDV1_REGNUM, 0);
 143           write_register (DDV2_REGNUM, 0xffffffff);
 144           dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK);
 145         }
 146       else
 147         {
 148           write_register (DDV1_REGNUM, 0);
 149           write_register (DDV2_REGNUM, 0xffffffff);
 150           dcr |= (DDV_TYPE_ACCESS);
 151         }
 152       write_register (DCR_REGNUM, dcr);
 153     }
 154   else
 155     return -1;
 156
 157   return 0;
 158 }
 159
 160 int
 161 sparclite_remove_watchpoint (addr, len, type)
 162      CORE_ADDR addr;
 163      int len;
 164      int type;
 165 {
 166   CORE_ADDR dcr, dda1, dda2;
 167
 168   dcr = read_register (DCR_REGNUM);
 169   dda1 = read_register (DDA1_REGNUM);
 170   dda2 = read_register (DDA2_REGNUM);
 171
 172   if ((dcr & DDA1_ENABLE) && addr == dda1)
 173     write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE));
 174   else if ((dcr & DDA2_ENABLE) && addr == dda2)
 175     write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE));
 176   else
 177     return -1;
 178
 179   return 0;
 180 }
 181
 182 int
 183 sparclite_insert_hw_breakpoint (addr, len)
 184      CORE_ADDR addr;
 185      int len;
 186 {
 187   CORE_ADDR dcr;
 188
 189   dcr = read_register (DCR_REGNUM);
 190
 191   if (!(dcr & DIA1_ENABLE))
 192     {
 193       write_register (DIA1_REGNUM, addr);
 194       write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE));
 195     }
 196   else if (!(dcr & DIA2_ENABLE))
 197     {
 198       write_register (DIA2_REGNUM, addr);
 199       write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE));
 200     }
 201   else
 202     return -1;
 203
 204   return 0;
 205 }
 206
 207 int
 208 sparclite_remove_hw_breakpoint (addr, shadow)
 209      CORE_ADDR addr;
 210      int shadow;
 211 {
 212   CORE_ADDR dcr, dia1, dia2;
 213
 214   dcr = read_register (DCR_REGNUM);
 215   dia1 = read_register (DIA1_REGNUM);
 216   dia2 = read_register (DIA2_REGNUM);
 217
 218   if ((dcr & DIA1_ENABLE) && addr == dia1)
 219     write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE));
 220   else if ((dcr & DIA2_ENABLE) && addr == dia2)
 221     write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE));
 222   else
 223     return -1;
 224
 225   return 0;
 226 }
 227
 228 int
 229 sparclite_check_watch_resources (type, cnt, ot)
 230      int type;
 231      int cnt;
 232      int ot;
 233 {
 234   /* Watchpoints not supported on simulator.  */
 235   if (strcmp (target_shortname, "sim") == 0)
 236     return 0;
 237
 238   if (type == bp_hardware_breakpoint)
 239     {
 240       if (TARGET_HW_BREAK_LIMIT == 0)
 241         return 0;
 242       else if (cnt <= TARGET_HW_BREAK_LIMIT)
 243         return 1;
 244     }
 245   else
 246     {
 247       if (TARGET_HW_WATCH_LIMIT == 0)
 248         return 0;
 249       else if (ot)
 250         return -1;
 251       else if (cnt <= TARGET_HW_WATCH_LIMIT)
 252         return 1;
 253     }
 254   return -1;
 255 }
 256
 257 CORE_ADDR
 258 sparclite_stopped_data_address ()
 259 {
 260   CORE_ADDR dsr, dda1, dda2;
 261
 262   dsr = read_register (DSR_REGNUM);
 263   dda1 = read_register (DDA1_REGNUM);
 264   dda2 = read_register (DDA2_REGNUM);
 265
 266   if (dsr & 0x10)
 267     return dda1;
 268   else if (dsr & 0x20)
 269     return dda2;
 270   else
 271     return 0;
 272 }
 273 \f
 274 static serial_t
 275 open_tty (name)
 276      char *name;
 277 {
 278   serial_t desc;
 279
 280   desc = SERIAL_OPEN (name);
 281   if (!desc)
 282     perror_with_name (name);
 283
 284   if (baud_rate != -1)
 285     {
 286       if (SERIAL_SETBAUDRATE (desc, baud_rate))
 287         {
 288           SERIAL_CLOSE (desc);
 289           perror_with_name (name);
 290         }
 291     }
 292
 293   SERIAL_RAW (desc);
 294
 295   SERIAL_FLUSH_INPUT (desc);
 296
 297   return desc;
 298 }
 299
 300 /* Read a single character from the remote end, masking it down to 7 bits. */
 301
 302 static int
 303 readchar (desc, timeout)
 304      serial_t desc;
 305      int timeout;
 306 {
 307   int ch;
 308   char s[10];
 309
 310   ch = SERIAL_READCHAR (desc, timeout);
 311
 312   switch (ch)
 313     {
 314     case SERIAL_EOF:
 315       error ("SPARClite remote connection closed");
 316     case SERIAL_ERROR:
 317       perror_with_name ("SPARClite communication error");
 318     case SERIAL_TIMEOUT:
 319       error ("SPARClite remote timeout");
 320     default:
 321       if (remote_debug > 0)
 322         {
 323           sprintf (s, "[%02x]", ch & 0xff);
 324           puts_debug ("read -->", s, "<--");
 325         }
 326       return ch;
 327     }
 328 }
 329
 330 static void
 331 debug_serial_write (desc, buf, len)
 332      serial_t desc;
 333      char *buf;
 334      int len;
 335 {
 336   char s[10];
 337
 338   SERIAL_WRITE (desc, buf, len);
 339   if (remote_debug > 0)
 340     {
 341       while (len-- > 0)
 342         {
 343           sprintf (s, "[%02x]", *buf & 0xff);
 344           puts_debug ("Sent -->", s, "<--");
 345           buf++;
 346         }
 347     }
 348 }
 349
 350
 351 static int
 352 send_resp (desc, c)
 353      serial_t desc;
 354      char c;
 355 {
 356   debug_serial_write (desc, &c, 1);
 357   return readchar (desc, remote_timeout);
 358 }
 359
 360 static void
 361 close_tty (void *ignore)
 362 {
 363   if (!remote_desc)
 364     return;
 365
 366   SERIAL_CLOSE (remote_desc);
 367
 368   remote_desc = NULL;
 369 }
 370
 371 #ifdef HAVE_SOCKETS
 372 static int
 373 recv_udp_buf (fd, buf, len, timeout)
 374      int fd, len;
 375      unsigned char *buf;
 376      int timeout;
 377 {
 378   int cc;
 379   fd_set readfds;
 380
 381   FD_ZERO (&readfds);
 382   FD_SET (fd, &readfds);
 383
 384   if (timeout >= 0)
 385     {
 386       struct timeval timebuf;
 387
 388       timebuf.tv_sec = timeout;
 389       timebuf.tv_usec = 0;
 390       cc = select (fd + 1, &readfds, 0, 0, &timebuf);
 391     }
 392   else
 393     cc = select (fd + 1, &readfds, 0, 0, 0);
 394
 395   if (cc == 0)
 396     return 0;
 397
 398   if (cc != 1)
 399     perror_with_name ("recv_udp_buf: Bad return value from select:");
 400
 401   cc = recv (fd, buf, len, 0);
 402
 403   if (cc < 0)
 404     perror_with_name ("Got an error from recv: ");
 405 }
 406
 407 static int
 408 send_udp_buf (fd, buf, len)
 409      int fd, len;
 410      unsigned char *buf;
 411 {
 412   int cc;
 413
 414   cc = send (fd, buf, len, 0);
 415
 416   if (cc == len)
 417     return;
 418
 419   if (cc < 0)
 420     perror_with_name ("Got an error from send: ");
 421
 422   error ("Short count in send: tried %d, sent %d\n", len, cc);
 423 }
 424 #endif /* HAVE_SOCKETS */
 425
 426 static void
 427 sparclite_open (name, from_tty)
 428      char *name;
 429      int from_tty;
 430 {
 431   struct cleanup *old_chain;
 432   int c;
 433   char *p;
 434
 435   if (!name)
 436     error ("You need to specify what device or hostname is associated with the SparcLite board.");
 437
 438   target_preopen (from_tty);
 439
 440   unpush_target (&sparclite_ops);
 441
 442   if (remote_target_name)
 443     free (remote_target_name);
 444
 445   remote_target_name = strsave (name);
 446
 447   /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
 448      mean either a serial port on a terminal server, or the IP address of a
 449      SPARClite demo board.  If there's no colon, then it pretty much has to be
 450      a local device (except for DOS... grrmble) */
 451
 452   p = strchr (name, ' ');
 453
 454   if (p)
 455     {
 456       *p++ = '\000';
 457       while ((*p != '\000') && isspace (*p))
 458         p++;
 459
 460       if (strncmp (name, "serial", strlen (name)) == 0)
 461         serial_flag = 1;
 462       else if (strncmp (name, "udp", strlen (name)) == 0)
 463         serial_flag = 0;
 464       else
 465         error ("Must specify either `serial' or `udp'.");
 466     }
 467   else
 468     {
 469       p = name;
 470
 471       if (!strchr (name, ':'))
 472         serial_flag = 1;        /* No colon is unambiguous (local device) */
 473       else
 474         error ("Usage: target sparclite serial /dev/ttyb\n\
 475 or: target sparclite udp host");
 476     }
 477
 478   if (serial_flag)
 479     {
 480       remote_desc = open_tty (p);
 481
 482       old_chain = make_cleanup (close_tty, 0 /*ignore*/);
 483
 484       c = send_resp (remote_desc, 0x00);
 485
 486       if (c != 0xaa)
 487         error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
 488                c);
 489
 490       c = send_resp (remote_desc, 0x55);
 491
 492       if (c != 0x55)
 493         error ("Sparclite appears to be ill.");
 494     }
 495   else
 496     {
 497 #ifdef HAVE_SOCKETS
 498       struct hostent *he;
 499       struct sockaddr_in sockaddr;
 500       unsigned char buffer[100];
 501       int cc;
 502
 503       /* Setup the socket.  Must be raw UDP. */
 504
 505       he = gethostbyname (p);
 506
 507       if (!he)
 508         error ("No such host %s.", p);
 509
 510       udp_fd = socket (PF_INET, SOCK_DGRAM, 0);
 511
 512       old_chain = make_cleanup (close, udp_fd);
 513
 514       sockaddr.sin_family = PF_INET;
 515       sockaddr.sin_port = htons (7000);
 516       memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));
 517
 518       if (connect (udp_fd, &sockaddr, sizeof (sockaddr)))
 519         perror_with_name ("Connect failed");
 520
 521       buffer[0] = 0x5;
 522       buffer[1] = 0;
 523
 524       send_udp_buf (udp_fd, buffer, 2);         /* Request version */
 525       cc = recv_udp_buf (udp_fd, buffer, sizeof (buffer), 5);   /* Get response */
 526       if (cc == 0)
 527         error ("SPARClite isn't responding.");
 528
 529       if (cc < 3)
 530         error ("SPARClite appears to be ill.");
 531 #else
 532       error ("UDP downloading is not supported for DOS hosts.");
 533 #endif /* HAVE_SOCKETS */
 534     }
 535
 536   printf_unfiltered ("[SPARClite appears to be alive]\n");
 537
 538   push_target (&sparclite_ops);
 539
 540   discard_cleanups (old_chain);
 541
 542   return;
 543 }
 544
 545 static void
 546 sparclite_close (quitting)
 547      int quitting;
 548 {
 549   if (serial_flag)
 550     close_tty (0);
 551 #ifdef HAVE_SOCKETS
 552   else if (udp_fd != -1)
 553     close (udp_fd);
 554 #endif
 555 }
 556
 557 #define LOAD_ADDRESS 0x40000000
 558
 559 static void
 560 download (target_name, args, from_tty, write_routine, start_routine)
 561      char *target_name;
 562      char *args;
 563      int from_tty;
 564      void (*write_routine) PARAMS ((bfd * from_bfd, asection * from_sec,
 565                              file_ptr from_addr, bfd_vma to_addr, int len));
 566      void (*start_routine) PARAMS ((bfd_vma entry));
 567 {
 568   struct cleanup *old_chain;
 569   asection *section;
 570   bfd *pbfd;
 571   bfd_vma entry;
 572   int i;
 573 #define WRITESIZE 1024
 574   char *filename;
 575   int quiet;
 576   int nostart;
 577
 578   quiet = 0;
 579   nostart = 0;
 580   filename = NULL;
 581
 582   while (*args != '\000')
 583     {
 584       char *arg;
 585
 586       while (isspace (*args))
 587         args++;
 588
 589       arg = args;
 590
 591       while ((*args != '\000') && !isspace (*args))
 592         args++;
 593
 594       if (*args != '\000')
 595         *args++ = '\000';
 596
 597       if (*arg != '-')
 598         filename = arg;
 599       else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
 600         quiet = 1;
 601       else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
 602         nostart = 1;
 603       else
 604         error ("unknown option `%s'", arg);
 605     }
 606
 607   if (!filename)
 608     filename = get_exec_file (1);
 609
 610   pbfd = bfd_openr (filename, gnutarget);
 611   if (pbfd == NULL)
 612     {
 613       perror_with_name (filename);
 614       return;
 615     }
 616   old_chain = make_cleanup_bfd_close (pbfd);
 617
 618   if (!bfd_check_format (pbfd, bfd_object))
 619     error ("\"%s\" is not an object file: %s", filename,
 620            bfd_errmsg (bfd_get_error ()));
 621
 622   for (section = pbfd->sections; section; section = section->next)
 623     {
 624       if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
 625         {
 626           bfd_vma section_address;
 627           bfd_size_type section_size;
 628           file_ptr fptr;
 629           const char *section_name;
 630
 631           section_name = bfd_get_section_name (pbfd, section);
 632
 633           section_address = bfd_get_section_vma (pbfd, section);
 634
 635           /* Adjust sections from a.out files, since they don't
 636              carry their addresses with.  */
 637           if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
 638             {
 639               if (strcmp (section_name, ".text") == 0)
 640                 section_address = bfd_get_start_address (pbfd);
 641               else if (strcmp (section_name, ".data") == 0)
 642                 {
 643                   /* Read the first 8 bytes of the data section.
 644                      There should be the string 'DaTa' followed by
 645                      a word containing the actual section address. */
 646                   struct data_marker
 647                     {
 648                       char signature[4];        /* 'DaTa' */
 649                       unsigned char sdata[4];   /* &sdata */
 650                     }
 651                   marker;
 652                   bfd_get_section_contents (pbfd, section, &marker, 0,
 653                                             sizeof (marker));
 654                   if (strncmp (marker.signature, "DaTa", 4) == 0)
 655                     {
 656                       if (TARGET_BYTE_ORDER == BIG_ENDIAN)
 657                         section_address = bfd_getb32 (marker.sdata);
 658                       else
 659                         section_address = bfd_getl32 (marker.sdata);
 660                     }
 661                 }
 662             }
 663
 664           section_size = bfd_get_section_size_before_reloc (section);
 665
 666           if (!quiet)
 667             printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
 668                              bfd_get_section_name (pbfd, section),
 669                              section_address,
 670                              section_size);
 671
 672           fptr = 0;
 673           while (section_size > 0)
 674             {
 675               int count;
 676               static char inds[] = "|/-\\";
 677               static int k = 0;
 678
 679               QUIT;
 680
 681               count = min (section_size, WRITESIZE);
 682
 683               write_routine (pbfd, section, fptr, section_address, count);
 684
 685               if (!quiet)
 686                 {
 687                   printf_unfiltered ("\r%c", inds[k++ % 4]);
 688                   gdb_flush (gdb_stdout);
 689                 }
 690
 691               section_address += count;
 692               fptr += count;
 693               section_size -= count;
 694             }
 695         }
 696     }
 697
 698   if (!nostart)
 699     {
 700       entry = bfd_get_start_address (pbfd);
 701
 702       if (!quiet)
 703         printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);
 704
 705       start_routine (entry);
 706     }
 707
 708   do_cleanups (old_chain);
 709 }
 710
 711 static void
 712 sparclite_serial_start (entry)
 713      bfd_vma entry;
 714 {
 715   char buffer[5];
 716   int i;
 717
 718   buffer[0] = 0x03;
 719   store_unsigned_integer (buffer + 1, 4, entry);
 720
 721   debug_serial_write (remote_desc, buffer, 1 + 4);
 722   i = readchar (remote_desc, remote_timeout);
 723   if (i != 0x55)
 724     error ("Can't start SparcLite.  Error code %d\n", i);
 725 }
 726
 727 static void
 728 sparclite_serial_write (from_bfd, from_sec, from_addr, to_addr, len)
 729      bfd *from_bfd;
 730      asection *from_sec;
 731      file_ptr from_addr;
 732      bfd_vma to_addr;
 733      int len;
 734 {
 735   char buffer[4 + 4 + WRITESIZE];       /* addr + len + data */
 736   unsigned char checksum;
 737   int i;
 738
 739   store_unsigned_integer (buffer, 4, to_addr);  /* Address */
 740   store_unsigned_integer (buffer + 4, 4, len);  /* Length */
 741
 742   bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);
 743
 744   checksum = 0;
 745   for (i = 0; i < len; i++)
 746     checksum += buffer[8 + i];
 747
 748   i = send_resp (remote_desc, 0x01);
 749
 750   if (i != 0x5a)
 751     error ("Bad response from load command (0x%x)", i);
 752
 753   debug_serial_write (remote_desc, buffer, 4 + 4 + len);
 754   i = readchar (remote_desc, remote_timeout);
 755
 756   if (i != checksum)
 757     error ("Bad checksum from load command (0x%x)", i);
 758 }
 759
 760 #ifdef HAVE_SOCKETS
 761
 762 static unsigned short
 763 calc_checksum (buffer, count)
 764      unsigned char *buffer;
 765      int count;
 766 {
 767   unsigned short checksum;
 768
 769   checksum = 0;
 770   for (; count > 0; count -= 2, buffer += 2)
 771     checksum += (*buffer << 8) | *(buffer + 1);
 772
 773   if (count != 0)
 774     checksum += *buffer << 8;
 775
 776   return checksum;
 777 }
 778
 779 static void
 780 sparclite_udp_start (entry)
 781      bfd_vma entry;
 782 {
 783   unsigned char buffer[6];
 784   int i;
 785
 786   buffer[0] = 0x3;
 787   buffer[1] = 0;
 788   buffer[2] = entry >> 24;
 789   buffer[3] = entry >> 16;
 790   buffer[4] = entry >> 8;
 791   buffer[5] = entry;
 792
 793   send_udp_buf (udp_fd, buffer, 6);     /* Send start addr */
 794   i = recv_udp_buf (udp_fd, buffer, sizeof (buffer), -1);       /* Get response */
 795
 796   if (i < 1 || buffer[0] != 0x55)
 797     error ("Failed to take start address.");
 798 }
 799
 800 static void
 801 sparclite_udp_write (from_bfd, from_sec, from_addr, to_addr, len)
 802      bfd *from_bfd;
 803      asection *from_sec;
 804      file_ptr from_addr;
 805      bfd_vma to_addr;
 806      int len;
 807 {
 808   unsigned char buffer[2000];
 809   unsigned short checksum;
 810   static int pkt_num = 0;
 811   static unsigned long old_addr = -1;
 812   int i;
 813
 814   while (1)
 815     {
 816       if (to_addr != old_addr)
 817         {
 818           buffer[0] = 0x1;      /* Load command */
 819           buffer[1] = 0x1;      /* Loading address */
 820           buffer[2] = to_addr >> 24;
 821           buffer[3] = to_addr >> 16;
 822           buffer[4] = to_addr >> 8;
 823           buffer[5] = to_addr;
 824
 825           checksum = 0;
 826           for (i = 0; i < 6; i++)
 827             checksum += buffer[i];
 828           checksum &= 0xff;
 829
 830           send_udp_buf (udp_fd, buffer, 6);
 831           i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);
 832
 833           if (i < 1)
 834             error ("Got back short checksum for load addr.");
 835
 836           if (checksum != buffer[0])
 837             error ("Got back bad checksum for load addr.");
 838
 839           pkt_num = 0;          /* Load addr resets packet seq # */
 840           old_addr = to_addr;
 841         }
 842
 843       bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
 844                                 len);
 845
 846       checksum = calc_checksum (buffer + 6, len);
 847
 848       buffer[0] = 0x1;          /* Load command */
 849       buffer[1] = 0x2;          /* Loading data */
 850       buffer[2] = pkt_num >> 8;
 851       buffer[3] = pkt_num;
 852       buffer[4] = checksum >> 8;
 853       buffer[5] = checksum;
 854
 855       send_udp_buf (udp_fd, buffer, len + 6);
 856       i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);
 857
 858       if (i == 0)
 859         {
 860           fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
 861           continue;
 862         }
 863
 864       if (buffer[0] != 0xff)
 865         error ("Got back bad response for load data.");
 866
 867       old_addr += len;
 868       pkt_num++;
 869
 870       return;
 871     }
 872 }
 873
 874 #endif /* HAVE_SOCKETS */
 875
 876 static void
 877 sparclite_download (filename, from_tty)
 878      char *filename;
 879      int from_tty;
 880 {
 881   if (!serial_flag)
 882 #ifdef HAVE_SOCKETS
 883     download (remote_target_name, filename, from_tty, sparclite_udp_write,
 884               sparclite_udp_start);
 885 #else
 886     abort ();                   /* sparclite_open should prevent this! */
 887 #endif
 888   else
 889     download (remote_target_name, filename, from_tty, sparclite_serial_write,
 890               sparclite_serial_start);
 891 }
 892 \f
 893 /* Set up the sparclite target vector.  */
 894
 895 static void
 896 init_sparclite_ops (void)
 897 {
 898   sparclite_ops.to_shortname = "sparclite";
 899   sparclite_ops.to_longname = "SPARClite download target";
 900   sparclite_ops.to_doc = "Download to a remote SPARClite target board via serial of UDP.\n\
 901 Specify the device it is connected to (e.g. /dev/ttya).";
 902   sparclite_ops.to_open = sparclite_open;
 903   sparclite_ops.to_close = sparclite_close;
 904   sparclite_ops.to_load = sparclite_download;
 905   sparclite_ops.to_stratum = download_stratum;
 906   sparclite_ops.to_magic = OPS_MAGIC;
 907 }
 908
 909 void
 910 _initialize_sparcl_tdep ()
 911 {
 912   init_sparclite_ops ();
 913   add_target (&sparclite_ops);
 914 }