sim/common/sim-core.c

   1 /*  This file is part of the program psim.
   2
   3     Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19     */
  20
  21
  22 #ifndef SIM_CORE_C
  23 #define SIM_CORE_C
  24
  25 #include "sim-main.h"
  26 #include "sim-assert.h"
  27
  28 #if (WITH_HW)
  29 #include "sim-hw.h"
  30 #endif
  31
  32 #if (WITH_DEVICES)
  33 /* TODO: create sim/common/device.h */
  34 void device_error (device *me, char* message, ...);
  35 int device_io_read_buffer(device *me, void *dest, int space, address_word addr, unsigned nr_bytes, sim_cpu *processor, sim_cia cia);
  36 int device_io_write_buffer(device *me, const void *source, int space, address_word addr, unsigned nr_bytes, sim_cpu *processor, sim_cia cia);
  37 #endif
  38
  39 /* "core" module install handler.
  40
  41    This is called via sim_module_install to install the "core"
  42    subsystem into the simulator.  */
  43
  44 #if EXTERN_SIM_CORE_P
  45 static MODULE_INIT_FN sim_core_init;
  46 static MODULE_UNINSTALL_FN sim_core_uninstall;
  47 #endif
  48
  49 #if EXTERN_SIM_CORE_P
  50 SIM_RC
  51 sim_core_install (SIM_DESC sd)
  52 {
  53   SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
  54
  55   /* establish the other handlers */
  56   sim_module_add_uninstall_fn (sd, sim_core_uninstall);
  57   sim_module_add_init_fn (sd, sim_core_init);
  58
  59   /* establish any initial data structures - none */
  60   return SIM_RC_OK;
  61 }
  62 #endif
  63
  64
  65 /* Uninstall the "core" subsystem from the simulator.  */
  66
  67 #if EXTERN_SIM_CORE_P
  68 static void
  69 sim_core_uninstall (SIM_DESC sd)
  70 {
  71   sim_core *core = STATE_CORE(sd);
  72   unsigned map;
  73   /* blow away any mappings */
  74   for (map = 0; map < nr_maps; map++) {
  75     sim_core_mapping *curr = core->common.map[map].first;
  76     while (curr != NULL) {
  77       sim_core_mapping *tbd = curr;
  78       curr = curr->next;
  79       if (tbd->free_buffer != NULL) {
  80         SIM_ASSERT(tbd->buffer != NULL);
  81         zfree(tbd->free_buffer);
  82       }
  83       zfree(tbd);
  84     }
  85     core->common.map[map].first = NULL;
  86   }
  87 }
  88 #endif
  89
  90
  91 #if EXTERN_SIM_CORE_P
  92 static SIM_RC
  93 sim_core_init (SIM_DESC sd)
  94 {
  95   /* Nothing to do */
  96   return SIM_RC_OK;
  97 }
  98 #endif
  99
 100
 101
 102 #ifndef SIM_CORE_SIGNAL
 103 #define SIM_CORE_SIGNAL(SD,CPU,CIA,MAP,NR_BYTES,ADDR,TRANSFER,ERROR) \
 104 sim_core_signal ((SD), (CPU), (CIA), (MAP), (NR_BYTES), (ADDR), (TRANSFER), (ERROR))
 105 #endif
 106
 107 #if EXTERN_SIM_CORE_P
 108 void
 109 sim_core_signal (SIM_DESC sd,
 110                  sim_cpu *cpu,
 111                  sim_cia cia,
 112                  unsigned map,
 113                  int nr_bytes,
 114                  address_word addr,
 115                  transfer_type transfer,
 116                  sim_core_signals sig)
 117 {
 118   const char *copy = (transfer == read_transfer ? "read" : "write");
 119   address_word ip = CIA_ADDR (cia);
 120   switch (sig)
 121     {
 122     case sim_core_unmapped_signal:
 123       sim_io_eprintf (sd, "core: %d byte %s to unmapped address 0x%lx at 0x%lx\n",
 124                       nr_bytes, copy, (unsigned long) addr, (unsigned long) ip);
 125       sim_engine_halt (sd, cpu, NULL, cia, sim_stopped, SIM_SIGSEGV);
 126       break;
 127     case sim_core_unaligned_signal:
 128       sim_io_eprintf (sd, "core: %d byte misaligned %s to address 0x%lx at 0x%lx\n",
 129                       nr_bytes, copy, (unsigned long) addr, (unsigned long) ip);
 130       sim_engine_halt (sd, cpu, NULL, cia, sim_stopped, SIM_SIGBUS);
 131       break;
 132     default:
 133       sim_engine_abort (sd, cpu, cia,
 134                         "sim_core_signal - internal error - bad switch");
 135     }
 136 }
 137 #endif
 138
 139
 140 #if EXTERN_SIM_CORE_P
 141 static sim_core_mapping *
 142 new_sim_core_mapping (SIM_DESC sd,
 143                       int level,
 144                       int space,
 145                       address_word addr,
 146                       address_word nr_bytes,
 147                       unsigned modulo,
 148 #if WITH_HW
 149                       struct hw *device,
 150 #else
 151                       device *device,
 152 #endif
 153                       void *buffer,
 154                       void *free_buffer)
 155 {
 156   sim_core_mapping *new_mapping = ZALLOC(sim_core_mapping);
 157   /* common */
 158   new_mapping->level = level;
 159   new_mapping->space = space;
 160   new_mapping->base = addr;
 161   new_mapping->nr_bytes = nr_bytes;
 162   new_mapping->bound = addr + (nr_bytes - 1);
 163   if (modulo == 0)
 164     new_mapping->mask = (unsigned) 0 - 1;
 165   else
 166     new_mapping->mask = modulo - 1;
 167   new_mapping->buffer = buffer;
 168   new_mapping->free_buffer = free_buffer;
 169   new_mapping->device = device;
 170   return new_mapping;
 171 }
 172 #endif
 173
 174
 175 #if EXTERN_SIM_CORE_P
 176 static void
 177 sim_core_map_attach (SIM_DESC sd,
 178                      sim_core_map *access_map,
 179                      int level,
 180                      int space,
 181                      address_word addr,
 182                      address_word nr_bytes,
 183                      unsigned modulo,
 184 #if WITH_HW
 185                      struct hw *client, /*callback/default*/
 186 #else
 187                      device *client, /*callback/default*/
 188 #endif
 189                      void *buffer, /*raw_memory*/
 190                      void *free_buffer) /*raw_memory*/
 191 {
 192   /* find the insertion point for this additional mapping and then
 193      insert */
 194   sim_core_mapping *next_mapping;
 195   sim_core_mapping **last_mapping;
 196
 197   SIM_ASSERT ((client == NULL) != (buffer == NULL));
 198   SIM_ASSERT ((client == NULL) >= (free_buffer != NULL));
 199
 200   /* actually do occasionally get a zero size map */
 201   if (nr_bytes == 0)
 202     {
 203 #if (WITH_DEVICES)
 204       device_error(client, "called on sim_core_map_attach with size zero");
 205 #endif
 206 #if (WITH_HW)
 207       sim_hw_abort (sd, client, "called on sim_core_map_attach with size zero");
 208 #endif
 209       sim_io_error (sd, "called on sim_core_map_attach with size zero");
 210     }
 211
 212   /* find the insertion point (between last/next) */
 213   next_mapping = access_map->first;
 214   last_mapping = &access_map->first;
 215   while(next_mapping != NULL
 216         && (next_mapping->level < level
 217             || (next_mapping->level == level
 218                 && next_mapping->bound < addr)))
 219     {
 220       /* provided levels are the same */
 221       /* assert: next_mapping->base > all bases before next_mapping */
 222       /* assert: next_mapping->bound >= all bounds before next_mapping */
 223       last_mapping = &next_mapping->next;
 224       next_mapping = next_mapping->next;
 225     }
 226
 227   /* check insertion point correct */
 228   SIM_ASSERT (next_mapping == NULL || next_mapping->level >= level);
 229   if (next_mapping != NULL && next_mapping->level == level
 230       && next_mapping->base < (addr + (nr_bytes - 1)))
 231     {
 232 #if (WITH_DEVICES)
 233       device_error (client, "memory map %d:0x%lx..0x%lx (%ld bytes) overlaps %d:0x%lx..0x%lx (%ld bytes)",
 234                     space,
 235                     (long) addr,
 236                     (long) nr_bytes,
 237                     (long) (addr + (nr_bytes - 1)),
 238                     next_mapping->space,
 239                     (long) next_mapping->base,
 240                     (long) next_mapping->bound,
 241                     (long) next_mapping->nr_bytes);
 242 #endif
 243 #if WITH_HW
 244       sim_hw_abort (sd, client, "memory map %d:0x%lx..0x%lx (%ld bytes) overlaps %d:0x%lx..0x%lx (%ld bytes)",
 245                     space,
 246                     (long) addr,
 247                     (long) nr_bytes,
 248                     (long) (addr + (nr_bytes - 1)),
 249                     next_mapping->space,
 250                     (long) next_mapping->base,
 251                     (long) next_mapping->bound,
 252                     (long) next_mapping->nr_bytes);
 253 #endif
 254       sim_io_error (sd, "memory map %d:0x%lx..0x%lx (%ld bytes) overlaps %d:0x%lx..0x%lx (%ld bytes)",
 255                     space,
 256                     (long) addr,
 257                     (long) nr_bytes,
 258                     (long) (addr + (nr_bytes - 1)),
 259                     next_mapping->space,
 260                     (long) next_mapping->base,
 261                     (long) next_mapping->bound,
 262                     (long) next_mapping->nr_bytes);
 263   }
 264
 265   /* create/insert the new mapping */
 266   *last_mapping = new_sim_core_mapping(sd,
 267                                        level,
 268                                        space, addr, nr_bytes, modulo,
 269                                        client, buffer, free_buffer);
 270   (*last_mapping)->next = next_mapping;
 271 }
 272 #endif
 273
 274
 275 /* Attach memory or a memory mapped device to the simulator.
 276    See sim-core.h for a full description.  */
 277
 278 #if EXTERN_SIM_CORE_P
 279 void
 280 sim_core_attach (SIM_DESC sd,
 281                  sim_cpu *cpu,
 282                  int level,
 283                  unsigned mapmask,
 284                  int space,
 285                  address_word addr,
 286                  address_word nr_bytes,
 287                  unsigned modulo,
 288 #if WITH_HW
 289                  struct hw *client,
 290 #else
 291                  device *client,
 292 #endif
 293                  void *optional_buffer)
 294 {
 295   sim_core *memory = STATE_CORE(sd);
 296   unsigned map;
 297   void *buffer;
 298   void *free_buffer;
 299
 300   /* check for for attempt to use unimplemented per-processor core map */
 301   if (cpu != NULL)
 302     sim_io_error (sd, "sim_core_map_attach - processor specific memory map not yet supported");
 303
 304   /* verify modulo memory */
 305   if (!WITH_MODULO_MEMORY && modulo != 0)
 306     {
 307 #if (WITH_DEVICES)
 308       device_error (client, "sim_core_attach - internal error - modulo memory disabled");
 309 #endif
 310 #if (WITH_HW)
 311       sim_hw_abort (sd, client, "sim_core_attach - internal error - modulo memory disabled");
 312 #endif
 313       sim_io_error (sd, "sim_core_attach - internal error - modulo memory disabled");
 314     }
 315   if (client != NULL && modulo != 0)
 316     {
 317 #if (WITH_DEVICES)
 318       device_error (client, "sim_core_attach - internal error - modulo and callback memory conflict");
 319 #endif
 320 #if (WITH_HW)
 321       sim_hw_abort (sd, client, "sim_core_attach - internal error - modulo and callback memory conflict");
 322 #endif
 323       sim_io_error (sd, "sim_core_attach - internal error - modulo and callback memory conflict");
 324     }
 325   if (modulo != 0)
 326     {
 327       unsigned mask = modulo - 1;
 328       /* any zero bits */
 329       while (mask >= sizeof (unsigned64)) /* minimum modulo */
 330         {
 331           if ((mask & 1) == 0)
 332             mask = 0;
 333           else
 334             mask >>= 1;
 335         }
 336       if (mask != sizeof (unsigned64) - 1)
 337         {
 338 #if (WITH_DEVICES)
 339           device_error (client, "sim_core_attach - internal error - modulo %lx not power of two", (long) modulo);
 340 #endif
 341 #if (WITH_HW)
 342           sim_hw_abort (sd, client, "sim_core_attach - internal error - modulo %lx not power of two", (long) modulo);
 343 #endif
 344           sim_io_error (sd, "sim_core_attach - internal error - modulo %lx not power of two", (long) modulo);
 345         }
 346     }
 347
 348   /* verify consistency between device and buffer */
 349   if (client != NULL && optional_buffer != NULL)
 350     {
 351 #if (WITH_DEVICES)
 352       device_error (client, "sim_core_attach - internal error - conflicting buffer and attach arguments");
 353 #endif
 354 #if (WITH_HW)
 355       sim_hw_abort (sd, client, "sim_core_attach - internal error - conflicting buffer and attach arguments");
 356 #endif
 357       sim_io_error (sd, "sim_core_attach - internal error - conflicting buffer and attach arguments");
 358     }
 359   if (client == NULL)
 360     {
 361       if (optional_buffer == NULL)
 362         {
 363           int padding = (addr % sizeof (unsigned64));
 364           unsigned long bytes = (modulo == 0 ? nr_bytes : modulo) + padding;
 365           free_buffer = zalloc (bytes);
 366           buffer = (char*) free_buffer + padding;
 367         }
 368       else
 369         {
 370           buffer = optional_buffer;
 371           free_buffer = NULL;
 372         }
 373     }
 374   else
 375     {
 376       /* a device */
 377       buffer = NULL;
 378       free_buffer = NULL;
 379     }
 380
 381   /* attach the region to all applicable access maps */
 382   for (map = 0;
 383        map < nr_maps;
 384        map++)
 385     {
 386       if (mapmask & (1 << map))
 387         {
 388           sim_core_map_attach (sd, &memory->common.map[map],
 389                                level, space, addr, nr_bytes, modulo,
 390                                client, buffer, free_buffer);
 391           free_buffer = NULL;
 392         }
 393     }
 394
 395   /* Just copy this map to each of the processor specific data structures.
 396      FIXME - later this will be replaced by true processor specific
 397      maps. */
 398   {
 399     int i;
 400     for (i = 0; i < MAX_NR_PROCESSORS; i++)
 401       {
 402         CPU_CORE (STATE_CPU (sd, i))->common = STATE_CORE (sd)->common;
 403       }
 404   }
 405 }
 406 #endif
 407
 408
 409 /* Remove any memory reference related to this address */
 410 #if EXTERN_SIM_CORE_P
 411 static void
 412 sim_core_map_detach (SIM_DESC sd,
 413                      sim_core_map *access_map,
 414                      int level,
 415                      int space,
 416                      address_word addr)
 417 {
 418   sim_core_mapping **entry;
 419   for (entry = &access_map->first;
 420        (*entry) != NULL;
 421        entry = &(*entry)->next)
 422     {
 423       if ((*entry)->base == addr
 424           && (*entry)->level == level
 425           && (*entry)->space == space)
 426         {
 427           sim_core_mapping *dead = (*entry);
 428           (*entry) = dead->next;
 429           if (dead->free_buffer != NULL)
 430             zfree (dead->free_buffer);
 431           zfree (dead);
 432           return;
 433         }
 434     }
 435 }
 436 #endif
 437
 438 #if EXTERN_SIM_CORE_P
 439 void
 440 sim_core_detach (SIM_DESC sd,
 441                  sim_cpu *cpu,
 442                  int level,
 443                  int address_space,
 444                  address_word addr)
 445 {
 446   sim_core *memory = STATE_CORE (sd);
 447   unsigned map;
 448   for (map = 0; map < nr_maps; map++)
 449     {
 450       sim_core_map_detach (sd, &memory->common.map[map],
 451                            level, address_space, addr);
 452     }
 453   /* Just copy this update to each of the processor specific data
 454      structures.  FIXME - later this will be replaced by true
 455      processor specific maps. */
 456   {
 457     int i;
 458     for (i = 0; i < MAX_NR_PROCESSORS; i++)
 459       {
 460         CPU_CORE (STATE_CPU (sd, i))->common = STATE_CORE (sd)->common;
 461       }
 462   }
 463 }
 464 #endif
 465
 466
 467 STATIC_INLINE_SIM_CORE\
 468 (sim_core_mapping *)
 469 sim_core_find_mapping(sim_core_common *core,
 470                       unsigned map,
 471                       address_word addr,
 472                       unsigned nr_bytes,
 473                       transfer_type transfer,
 474                       int abort, /*either 0 or 1 - hint to inline/-O */
 475                       sim_cpu *cpu, /* abort => cpu != NULL */
 476                       sim_cia cia)
 477 {
 478   sim_core_mapping *mapping = core->map[map].first;
 479   ASSERT ((addr & (nr_bytes - 1)) == 0); /* must be aligned */
 480   ASSERT ((addr + (nr_bytes - 1)) >= addr); /* must not wrap */
 481   ASSERT (!abort || cpu != NULL); /* abort needs a non null CPU */
 482   while (mapping != NULL)
 483     {
 484       if (addr >= mapping->base
 485           && (addr + (nr_bytes - 1)) <= mapping->bound)
 486         return mapping;
 487       mapping = mapping->next;
 488     }
 489   if (abort)
 490     {
 491       SIM_CORE_SIGNAL (CPU_STATE (cpu), cpu, cia, map, nr_bytes, addr, transfer,
 492                        sim_core_unmapped_signal);
 493     }
 494   return NULL;
 495 }
 496
 497
 498 STATIC_INLINE_SIM_CORE\
 499 (void *)
 500 sim_core_translate (sim_core_mapping *mapping,
 501                     address_word addr)
 502 {
 503   if (WITH_MODULO_MEMORY)
 504     return (void *)((unsigned8 *) mapping->buffer
 505                     + ((addr - mapping->base) & mapping->mask));
 506   else
 507     return (void *)((unsigned8 *) mapping->buffer
 508                     + addr - mapping->base);
 509 }
 510
 511
 512 #if EXTERN_SIM_CORE_P
 513 unsigned
 514 sim_core_read_buffer (SIM_DESC sd,
 515                       sim_cpu *cpu,
 516                       unsigned map,
 517                       void *buffer,
 518                       address_word addr,
 519                       unsigned len)
 520 {
 521   sim_core_common *core = (cpu == NULL ? &STATE_CORE (sd)->common : &CPU_CORE (cpu)->common);
 522   unsigned count = 0;
 523   while (count < len)
 524  {
 525     unsigned_word raddr = addr + count;
 526     sim_core_mapping *mapping =
 527       sim_core_find_mapping (core, map,
 528                             raddr, /*nr-bytes*/1,
 529                             read_transfer,
 530                             0 /*dont-abort*/, NULL, NULL_CIA);
 531     if (mapping == NULL)
 532       break;
 533 #if (WITH_DEVICES)
 534     if (mapping->device != NULL)
 535       {
 536         int nr_bytes = len - count;
 537         if (raddr + nr_bytes - 1> mapping->bound)
 538           nr_bytes = mapping->bound - raddr + 1;
 539         if (device_io_read_buffer (mapping->device,
 540                                    (unsigned_1*)buffer + count,
 541                                    mapping->space,
 542                                    raddr,
 543                                    nr_bytes,
 544                                    cpu,
 545                                    CIA_GET (cpu)) != nr_bytes)
 546           break;
 547         count += nr_bytes;
 548         continue;
 549       }
 550 #endif
 551 #if (WITH_HW)
 552     if (mapping->device != NULL)
 553       {
 554         int nr_bytes = len - count;
 555         if (raddr + nr_bytes - 1> mapping->bound)
 556           nr_bytes = mapping->bound - raddr + 1;
 557         if (sim_hw_io_read_buffer (sd, mapping->device,
 558                                    (unsigned_1*)buffer + count,
 559                                    mapping->space,
 560                                    raddr,
 561                                    nr_bytes) != nr_bytes)
 562           break;
 563         count += nr_bytes;
 564         continue;
 565       }
 566 #endif
 567     ((unsigned_1*)buffer)[count] =
 568       *(unsigned_1*)sim_core_translate(mapping, raddr);
 569     count += 1;
 570  }
 571   return count;
 572 }
 573 #endif
 574
 575
 576 #if EXTERN_SIM_CORE_P
 577 unsigned
 578 sim_core_write_buffer (SIM_DESC sd,
 579                        sim_cpu *cpu,
 580                        unsigned map,
 581                        const void *buffer,
 582                        address_word addr,
 583                        unsigned len)
 584 {
 585   sim_core_common *core = (cpu == NULL ? &STATE_CORE (sd)->common : &CPU_CORE (cpu)->common);
 586   unsigned count = 0;
 587   while (count < len)
 588     {
 589       unsigned_word raddr = addr + count;
 590       sim_core_mapping *mapping =
 591         sim_core_find_mapping (core, map,
 592                                raddr, /*nr-bytes*/1,
 593                                write_transfer,
 594                                0 /*dont-abort*/, NULL, NULL_CIA);
 595       if (mapping == NULL)
 596         break;
 597 #if (WITH_DEVICES)
 598       if (WITH_CALLBACK_MEMORY
 599           && mapping->device != NULL)
 600         {
 601           int nr_bytes = len - count;
 602           if (raddr + nr_bytes - 1 > mapping->bound)
 603             nr_bytes = mapping->bound - raddr + 1;
 604           if (device_io_write_buffer (mapping->device,
 605                                       (unsigned_1*)buffer + count,
 606                                       mapping->space,
 607                                       raddr,
 608                                       nr_bytes,
 609                                       cpu,
 610                                       CIA_GET(cpu)) != nr_bytes)
 611             break;
 612           count += nr_bytes;
 613           continue;
 614         }
 615 #endif
 616 #if (WITH_HW)
 617       if (WITH_CALLBACK_MEMORY
 618           && mapping->device != NULL)
 619         {
 620           int nr_bytes = len - count;
 621           if (raddr + nr_bytes - 1 > mapping->bound)
 622             nr_bytes = mapping->bound - raddr + 1;
 623           if (sim_hw_io_write_buffer (sd, mapping->device,
 624                                       (unsigned_1*)buffer + count,
 625                                       mapping->space,
 626                                       raddr,
 627                                       nr_bytes) != nr_bytes)
 628             break;
 629           count += nr_bytes;
 630           continue;
 631         }
 632 #endif
 633       *(unsigned_1*)sim_core_translate(mapping, raddr) =
 634         ((unsigned_1*)buffer)[count];
 635       count += 1;
 636     }
 637   return count;
 638 }
 639 #endif
 640
 641
 642 #if EXTERN_SIM_CORE_P
 643 void
 644 sim_core_set_xor (SIM_DESC sd,
 645                   sim_cpu *cpu,
 646                   int is_xor)
 647 {
 648   /* set up the XOR map if required. */
 649   if (WITH_XOR_ENDIAN) {
 650     {
 651       sim_core *core = STATE_CORE (sd);
 652       sim_cpu_core *cpu_core = (cpu != NULL ? CPU_CORE (cpu) : NULL);
 653       if (cpu_core != NULL)
 654         {
 655           int i = 1;
 656           unsigned mask;
 657           if (is_xor)
 658             mask = WITH_XOR_ENDIAN - 1;
 659           else
 660             mask = 0;
 661           while (i - 1 < WITH_XOR_ENDIAN)
 662             {
 663               cpu_core->xor[i-1] = mask;
 664               mask = (mask << 1) & (WITH_XOR_ENDIAN - 1);
 665               i = (i << 1);
 666             }
 667         }
 668       else
 669         {
 670           if (is_xor)
 671             core->byte_xor = WITH_XOR_ENDIAN - 1;
 672           else
 673             core->byte_xor = 0;
 674         }
 675     }
 676   }
 677   else {
 678     if (is_xor)
 679       sim_engine_abort (sd, NULL, NULL_CIA,
 680                         "Attempted to enable xor-endian mode when permenantly disabled.");
 681   }
 682 }
 683 #endif
 684
 685
 686 #if EXTERN_SIM_CORE_P
 687 static void
 688 reverse_n (unsigned_1 *dest,
 689            const unsigned_1 *src,
 690            int nr_bytes)
 691 {
 692   int i;
 693   for (i = 0; i < nr_bytes; i++)
 694     {
 695       dest [nr_bytes - i - 1] = src [i];
 696     }
 697 }
 698 #endif
 699
 700
 701 #if EXTERN_SIM_CORE_P
 702 unsigned
 703 sim_core_xor_read_buffer (SIM_DESC sd,
 704                           sim_cpu *cpu,
 705                           unsigned map,
 706                           void *buffer,
 707                           address_word addr,
 708                           unsigned nr_bytes)
 709 {
 710   address_word byte_xor = (cpu == NULL ? STATE_CORE (sd)->byte_xor : CPU_CORE (cpu)->xor[0]);
 711   if (!WITH_XOR_ENDIAN || !byte_xor)
 712     return sim_core_read_buffer (sd, cpu, map, buffer, addr, nr_bytes);
 713   else
 714     /* only break up transfers when xor-endian is both selected and enabled */
 715     {
 716       unsigned_1 x[WITH_XOR_ENDIAN + 1]; /* +1 to avoid zero-sized array */
 717       unsigned nr_transfered = 0;
 718       address_word start = addr;
 719       unsigned nr_this_transfer = (WITH_XOR_ENDIAN - (addr & ~(WITH_XOR_ENDIAN - 1)));
 720       address_word stop;
 721       /* initial and intermediate transfers are broken when they cross
 722          an XOR endian boundary */
 723       while (nr_transfered + nr_this_transfer < nr_bytes)
 724         /* initial/intermediate transfers */
 725         {
 726           /* since xor-endian is enabled stop^xor defines the start
 727              address of the transfer */
 728           stop = start + nr_this_transfer - 1;
 729           SIM_ASSERT (start <= stop);
 730           SIM_ASSERT ((stop ^ byte_xor) <= (start ^ byte_xor));
 731           if (sim_core_read_buffer (sd, cpu, map, x, stop ^ byte_xor, nr_this_transfer)
 732               != nr_this_transfer)
 733             return nr_transfered;
 734           reverse_n (&((unsigned_1*)buffer)[nr_transfered], x, nr_this_transfer);
 735           nr_transfered += nr_this_transfer;
 736           nr_this_transfer = WITH_XOR_ENDIAN;
 737           start = stop + 1;
 738         }
 739       /* final transfer */
 740       nr_this_transfer = nr_bytes - nr_transfered;
 741       stop = start + nr_this_transfer - 1;
 742       SIM_ASSERT (stop == (addr + nr_bytes - 1));
 743       if (sim_core_read_buffer (sd, cpu, map, x, stop ^ byte_xor, nr_this_transfer)
 744           != nr_this_transfer)
 745         return nr_transfered;
 746       reverse_n (&((unsigned_1*)buffer)[nr_transfered], x, nr_this_transfer);
 747       return nr_bytes;
 748     }
 749 }
 750 #endif
 751
 752
 753 #if EXTERN_SIM_CORE_P
 754 unsigned
 755 sim_core_xor_write_buffer (SIM_DESC sd,
 756                            sim_cpu *cpu,
 757                            unsigned map,
 758                            const void *buffer,
 759                            address_word addr,
 760                            unsigned nr_bytes)
 761 {
 762   address_word byte_xor = (cpu == NULL ? STATE_CORE (sd)->byte_xor : CPU_CORE (cpu)->xor[0]);
 763   if (!WITH_XOR_ENDIAN || !byte_xor)
 764     return sim_core_write_buffer (sd, cpu, map, buffer, addr, nr_bytes);
 765   else
 766     /* only break up transfers when xor-endian is both selected and enabled */
 767     {
 768       unsigned_1 x[WITH_XOR_ENDIAN + 1]; /* +1 to avoid zero sized array */
 769       unsigned nr_transfered = 0;
 770       address_word start = addr;
 771       unsigned nr_this_transfer = (WITH_XOR_ENDIAN - (addr & ~(WITH_XOR_ENDIAN - 1)));
 772       address_word stop;
 773       /* initial and intermediate transfers are broken when they cross
 774          an XOR endian boundary */
 775       while (nr_transfered + nr_this_transfer < nr_bytes)
 776         /* initial/intermediate transfers */
 777         {
 778           /* since xor-endian is enabled stop^xor defines the start
 779              address of the transfer */
 780           stop = start + nr_this_transfer - 1;
 781           SIM_ASSERT (start <= stop);
 782           SIM_ASSERT ((stop ^ byte_xor) <= (start ^ byte_xor));
 783           reverse_n (x, &((unsigned_1*)buffer)[nr_transfered], nr_this_transfer);
 784           if (sim_core_read_buffer (sd, cpu, map, x, stop ^ byte_xor, nr_this_transfer)
 785               != nr_this_transfer)
 786             return nr_transfered;
 787           nr_transfered += nr_this_transfer;
 788           nr_this_transfer = WITH_XOR_ENDIAN;
 789           start = stop + 1;
 790         }
 791       /* final transfer */
 792       nr_this_transfer = nr_bytes - nr_transfered;
 793       stop = start + nr_this_transfer - 1;
 794       SIM_ASSERT (stop == (addr + nr_bytes - 1));
 795       reverse_n (x, &((unsigned_1*)buffer)[nr_transfered], nr_this_transfer);
 796       if (sim_core_read_buffer (sd, cpu, map, x, stop ^ byte_xor, nr_this_transfer)
 797           != nr_this_transfer)
 798         return nr_transfered;
 799       return nr_bytes;
 800     }
 801 }
 802 #endif
 803
 804
 805
 806 /* define the read/write 1/2/4/8/16/word functions */
 807
 808 #define N 16
 809 #include "sim-n-core.h"
 810
 811 #define N 8
 812 #include "sim-n-core.h"
 813
 814 #define N 7
 815 #define M 8
 816 #include "sim-n-core.h"
 817
 818 #define N 6
 819 #define M 8
 820 #include "sim-n-core.h"
 821
 822 #define N 5
 823 #define M 8
 824 #include "sim-n-core.h"
 825
 826 #define N 4
 827 #include "sim-n-core.h"
 828
 829 #define N 3
 830 #define M 4
 831 #include "sim-n-core.h"
 832
 833 #define N 2
 834 #include "sim-n-core.h"
 835
 836 #define N 1
 837 #include "sim-n-core.h"
 838
 839 #endif