sim/common/sim-memopt.c

   1 /* Simulator memory option handling.
   2    Copyright (C) 1996-2021 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.
   4
   5 This file is part of GDB, the GNU debugger.
   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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* This must come before any other includes.  */
  21 #include "defs.h"
  22
  23 #include "sim-main.h"
  24 #include "sim-assert.h"
  25 #include "sim-options.h"
  26
  27 #include <string.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #ifdef HAVE_FCNTL_H
  31 #include <fcntl.h>
  32 #endif
  33 #ifdef HAVE_SYS_MMAN_H
  34 #include <sys/mman.h>
  35 #endif
  36 #ifdef HAVE_SYS_STAT_H
  37 #include <sys/stat.h>
  38 #endif
  39 #ifdef HAVE_UNISTD_H
  40 #include <unistd.h>
  41 #endif
  42
  43 /* Memory fill byte. */
  44 static unsigned8 fill_byte_value;
  45 static int fill_byte_flag = 0;
  46
  47 /* Memory mapping; see OPTION_MEMORY_MAPFILE. */
  48 static int mmap_next_fd = -1;
  49
  50 /* Memory command line options. */
  51
  52 enum {
  53   OPTION_MEMORY_DELETE = OPTION_START,
  54   OPTION_MEMORY_REGION,
  55   OPTION_MEMORY_SIZE,
  56   OPTION_MEMORY_INFO,
  57   OPTION_MEMORY_ALIAS,
  58   OPTION_MEMORY_CLEAR,
  59   OPTION_MEMORY_FILL,
  60   OPTION_MEMORY_MAPFILE,
  61   OPTION_MAP_INFO
  62 };
  63
  64 static DECLARE_OPTION_HANDLER (memory_option_handler);
  65
  66 static const OPTION memory_options[] =
  67 {
  68   { {"memory-delete", required_argument, NULL, OPTION_MEMORY_DELETE },
  69       '\0', "ADDRESS|all", "Delete memory at ADDRESS (all addresses)",
  70       memory_option_handler },
  71   { {"delete-memory", required_argument, NULL, OPTION_MEMORY_DELETE },
  72       '\0', "ADDRESS", NULL,
  73       memory_option_handler },
  74
  75   { {"memory-region", required_argument, NULL, OPTION_MEMORY_REGION },
  76       '\0', "ADDRESS,SIZE[,MODULO]", "Add a memory region",
  77       memory_option_handler },
  78
  79   { {"memory-alias", required_argument, NULL, OPTION_MEMORY_ALIAS },
  80       '\0', "ADDRESS,SIZE{,ADDRESS}", "Add memory shadow",
  81       memory_option_handler },
  82
  83   { {"memory-size", required_argument, NULL, OPTION_MEMORY_SIZE },
  84       '\0', "<size>[in bytes, Kb (k suffix), Mb (m suffix) or Gb (g suffix)]",
  85      "Add memory at address zero", memory_option_handler },
  86
  87   { {"memory-fill", required_argument, NULL, OPTION_MEMORY_FILL },
  88       '\0', "VALUE", "Fill subsequently added memory regions",
  89       memory_option_handler },
  90
  91   { {"memory-clear", no_argument, NULL, OPTION_MEMORY_CLEAR },
  92       '\0', NULL, "Clear subsequently added memory regions",
  93       memory_option_handler },
  94
  95 #if defined(HAVE_MMAP) && defined(HAVE_MUNMAP)
  96   { {"memory-mapfile", required_argument, NULL, OPTION_MEMORY_MAPFILE },
  97       '\0', "FILE", "Memory-map next memory region from file",
  98       memory_option_handler },
  99 #endif
 100
 101   { {"memory-info", no_argument, NULL, OPTION_MEMORY_INFO },
 102       '\0', NULL, "List configurable memory regions",
 103       memory_option_handler },
 104   { {"info-memory", no_argument, NULL, OPTION_MEMORY_INFO },
 105       '\0', NULL, NULL,
 106       memory_option_handler },
 107   { {"map-info", no_argument, NULL, OPTION_MAP_INFO },
 108       '\0', NULL, "List mapped regions",
 109       memory_option_handler },
 110
 111   { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL }
 112 };
 113
 114
 115 static sim_memopt *
 116 do_memopt_add (SIM_DESC sd,
 117                int level,
 118                int space,
 119                address_word addr,
 120                address_word nr_bytes,
 121                unsigned modulo,
 122                sim_memopt **entry,
 123                void *buffer)
 124 {
 125   void *fill_buffer;
 126   unsigned fill_length;
 127   void *free_buffer;
 128   unsigned long free_length;
 129
 130   if (buffer != NULL)
 131     {
 132       /* Buffer already given.  sim_memory_uninstall will free it. */
 133       sim_core_attach (sd, NULL,
 134                        level, access_read_write_exec, space,
 135                        addr, nr_bytes, modulo, NULL, buffer);
 136
 137       free_buffer = buffer;
 138       free_length = 0;
 139       fill_buffer = buffer;
 140       fill_length = (modulo == 0) ? nr_bytes : modulo;
 141     }
 142   else
 143     {
 144       /* Allocate new well-aligned buffer, just as sim_core_attach(). */
 145       void *aligned_buffer;
 146       int padding = (addr % sizeof (unsigned64));
 147       unsigned long bytes;
 148
 149 #ifdef HAVE_MMAP
 150       struct stat s;
 151
 152       if (mmap_next_fd >= 0)
 153         {
 154           /* Check that given file is big enough. */
 155           int rc = fstat (mmap_next_fd, &s);
 156
 157           if (rc < 0)
 158             sim_io_error (sd, "Error, unable to stat file: %s\n",
 159                           strerror (errno));
 160
 161           /* Autosize the mapping to the file length.  */
 162           if (nr_bytes == 0)
 163             nr_bytes = s.st_size;
 164         }
 165 #endif
 166
 167       bytes = (modulo == 0 ? nr_bytes : modulo) + padding;
 168
 169       free_buffer = NULL;
 170       free_length = bytes;
 171
 172 #ifdef HAVE_MMAP
 173       /* Memory map or malloc(). */
 174       if (mmap_next_fd >= 0)
 175         {
 176           /* Some kernels will SIGBUS the application if mmap'd file
 177              is not large enough.  */
 178           if (s.st_size < bytes)
 179             {
 180               sim_io_error (sd,
 181                             "Error, cannot confirm that mmap file is large enough "
 182                             "(>= %ld bytes)\n", bytes);
 183             }
 184
 185           free_buffer = mmap (0, bytes, PROT_READ|PROT_WRITE, MAP_SHARED, mmap_next_fd, 0);
 186           if (free_buffer == 0 || free_buffer == (char*)-1) /* MAP_FAILED */
 187             {
 188               sim_io_error (sd, "Error, cannot mmap file (%s).\n",
 189                             strerror (errno));
 190             }
 191         }
 192 #endif
 193
 194       /* Need heap allocation? */
 195       if (free_buffer == NULL)
 196         {
 197           /* If filling with non-zero value, do not use clearing allocator. */
 198           if (fill_byte_flag && fill_byte_value != 0)
 199             free_buffer = xmalloc (bytes); /* don't clear */
 200           else
 201             free_buffer = zalloc (bytes); /* clear */
 202         }
 203
 204       aligned_buffer = (char*) free_buffer + padding;
 205
 206       sim_core_attach (sd, NULL,
 207                        level, access_read_write_exec, space,
 208                        addr, nr_bytes, modulo, NULL, aligned_buffer);
 209
 210       fill_buffer = aligned_buffer;
 211       fill_length = (modulo == 0) ? nr_bytes : modulo;
 212
 213       /* If we just used a clearing allocator, and are about to fill with
 214          zero, truncate the redundant fill operation. */
 215
 216       if (fill_byte_flag && fill_byte_value == 0)
 217          fill_length = 1; /* avoid boundary length=0 case */
 218     }
 219
 220   if (fill_byte_flag)
 221     {
 222       ASSERT (fill_buffer != 0);
 223       memset ((char*) fill_buffer, fill_byte_value, fill_length);
 224     }
 225
 226   while ((*entry) != NULL)
 227     entry = &(*entry)->next;
 228   (*entry) = ZALLOC (sim_memopt);
 229   (*entry)->level = level;
 230   (*entry)->space = space;
 231   (*entry)->addr = addr;
 232   (*entry)->nr_bytes = nr_bytes;
 233   (*entry)->modulo = modulo;
 234   (*entry)->buffer = free_buffer;
 235
 236   /* Record memory unmapping info.  */
 237   if (mmap_next_fd >= 0)
 238     {
 239       (*entry)->munmap_length = free_length;
 240       close (mmap_next_fd);
 241       mmap_next_fd = -1;
 242     }
 243   else
 244     (*entry)->munmap_length = 0;
 245
 246   return (*entry);
 247 }
 248
 249 static SIM_RC
 250 do_memopt_delete (SIM_DESC sd,
 251                   int level,
 252                   int space,
 253                   address_word addr)
 254 {
 255   sim_memopt **entry = &STATE_MEMOPT (sd);
 256   sim_memopt *alias;
 257   while ((*entry) != NULL
 258          && ((*entry)->level != level
 259               || (*entry)->space != space
 260               || (*entry)->addr != addr))
 261     entry = &(*entry)->next;
 262   if ((*entry) == NULL)
 263     {
 264       sim_io_eprintf (sd, "Memory at 0x%lx not found, not deleted\n",
 265                       (long) addr);
 266       return SIM_RC_FAIL;
 267     }
 268   /* delete any buffer */
 269   if ((*entry)->buffer != NULL)
 270     {
 271 #ifdef HAVE_MUNMAP
 272       if ((*entry)->munmap_length > 0)
 273         munmap ((*entry)->buffer, (*entry)->munmap_length);
 274       else
 275 #endif
 276         free ((*entry)->buffer);
 277     }
 278
 279   /* delete it and its aliases */
 280   alias = *entry;
 281   *entry = (*entry)->next;
 282   while (alias != NULL)
 283     {
 284       sim_memopt *dead = alias;
 285       alias = alias->alias;
 286       sim_core_detach (sd, NULL, dead->level, dead->space, dead->addr);
 287       free (dead);
 288     }
 289   return SIM_RC_OK;
 290 }
 291
 292
 293 static char *
 294 parse_size (char *chp,
 295             address_word *nr_bytes,
 296             unsigned *modulo)
 297 {
 298   /* <nr_bytes>[K|M|G] [ "%" <modulo> ] */
 299   *nr_bytes = strtoul (chp, &chp, 0);
 300   switch (*chp)
 301     {
 302     case '%':
 303       *modulo = strtoul (chp + 1, &chp, 0);
 304       break;
 305     case 'g': case 'G': /* Gigabyte suffix.  */
 306       *nr_bytes <<= 10;
 307       /* Fall through.  */
 308     case 'm': case 'M': /* Megabyte suffix.  */
 309       *nr_bytes <<= 10;
 310       /* Fall through.  */
 311     case 'k': case 'K': /* Kilobyte suffix.  */
 312       *nr_bytes <<= 10;
 313       /* Check for a modulo specifier after the suffix.  */
 314       ++ chp;
 315       if (* chp == 'b' || * chp == 'B')
 316         ++ chp;
 317       if (* chp == '%')
 318         *modulo = strtoul (chp + 1, &chp, 0);
 319       break;
 320     }
 321   return chp;
 322 }
 323
 324 static char *
 325 parse_ulong_value (char *chp,
 326                      unsigned long *value)
 327 {
 328   *value = strtoul (chp, &chp, 0);
 329   return chp;
 330 }
 331
 332 static char *
 333 parse_addr (char *chp,
 334             int *level,
 335             int *space,
 336             address_word *addr)
 337 {
 338   /* [ <space> ": " ] <addr> [ "@" <level> ] */
 339   *addr = (unsigned long) strtoul (chp, &chp, 0);
 340   if (*chp == ':')
 341     {
 342       *space = *addr;
 343       *addr = (unsigned long) strtoul (chp + 1, &chp, 0);
 344     }
 345   if (*chp == '@')
 346     {
 347       *level = strtoul (chp + 1, &chp, 0);
 348     }
 349   return chp;
 350 }
 351
 352
 353 static SIM_RC
 354 memory_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,
 355                        char *arg, int is_command)
 356 {
 357   switch (opt)
 358     {
 359
 360     case OPTION_MEMORY_DELETE:
 361       if (strcasecmp (arg, "all") == 0)
 362         {
 363           while (STATE_MEMOPT (sd) != NULL)
 364             do_memopt_delete (sd,
 365                               STATE_MEMOPT (sd)->level,
 366                               STATE_MEMOPT (sd)->space,
 367                               STATE_MEMOPT (sd)->addr);
 368           return SIM_RC_OK;
 369         }
 370       else
 371         {
 372           int level = 0;
 373           int space = 0;
 374           address_word addr = 0;
 375           parse_addr (arg, &level, &space, &addr);
 376           return do_memopt_delete (sd, level, space, addr);
 377         }
 378
 379     case OPTION_MEMORY_REGION:
 380       {
 381         char *chp = arg;
 382         int level = 0;
 383         int space = 0;
 384         address_word addr = 0;
 385         address_word nr_bytes = 0;
 386         unsigned modulo = 0;
 387         /* parse the arguments */
 388         chp = parse_addr (chp, &level, &space, &addr);
 389         if (*chp != ',')
 390           {
 391             /* let the file autosize */
 392             if (mmap_next_fd == -1)
 393               {
 394                 sim_io_eprintf (sd, "Missing size for memory-region\n");
 395                 return SIM_RC_FAIL;
 396               }
 397           }
 398         else
 399           chp = parse_size (chp + 1, &nr_bytes, &modulo);
 400         /* old style */
 401         if (*chp == ',')
 402           modulo = strtoul (chp + 1, &chp, 0);
 403         /* try to attach/insert it */
 404         do_memopt_add (sd, level, space, addr, nr_bytes, modulo,
 405                        &STATE_MEMOPT (sd), NULL);
 406         return SIM_RC_OK;
 407       }
 408
 409     case OPTION_MEMORY_ALIAS:
 410       {
 411         char *chp = arg;
 412         int level = 0;
 413         int space = 0;
 414         address_word addr = 0;
 415         address_word nr_bytes = 0;
 416         unsigned modulo = 0;
 417         sim_memopt *entry;
 418         /* parse the arguments */
 419         chp = parse_addr (chp, &level, &space, &addr);
 420         if (*chp != ',')
 421           {
 422             sim_io_eprintf (sd, "Missing size for memory-region\n");
 423             return SIM_RC_FAIL;
 424           }
 425         chp = parse_size (chp + 1, &nr_bytes, &modulo);
 426         /* try to attach/insert the main record */
 427         entry = do_memopt_add (sd, level, space, addr, nr_bytes, modulo,
 428                                &STATE_MEMOPT (sd),
 429                                NULL);
 430         /* now attach all the aliases */
 431         while (*chp == ',')
 432           {
 433             int a_level = level;
 434             int a_space = space;
 435             address_word a_addr = addr;
 436             chp = parse_addr (chp + 1, &a_level, &a_space, &a_addr);
 437             do_memopt_add (sd, a_level, a_space, a_addr, nr_bytes, modulo,
 438                            &entry->alias, entry->buffer);
 439           }
 440         return SIM_RC_OK;
 441       }
 442
 443     case OPTION_MEMORY_SIZE:
 444       {
 445         int level = 0;
 446         int space = 0;
 447         address_word addr = 0;
 448         address_word nr_bytes = 0;
 449         unsigned modulo = 0;
 450         /* parse the arguments */
 451         parse_size (arg, &nr_bytes, &modulo);
 452         /* try to attach/insert it */
 453         do_memopt_add (sd, level, space, addr, nr_bytes, modulo,
 454                        &STATE_MEMOPT (sd), NULL);
 455         return SIM_RC_OK;
 456       }
 457
 458     case OPTION_MEMORY_CLEAR:
 459       {
 460         fill_byte_value = (unsigned8) 0;
 461         fill_byte_flag = 1;
 462         return SIM_RC_OK;
 463         break;
 464       }
 465
 466     case OPTION_MEMORY_FILL:
 467       {
 468         unsigned long fill_value;
 469         parse_ulong_value (arg, &fill_value);
 470         if (fill_value > 255)
 471           {
 472             sim_io_eprintf (sd, "Missing fill value between 0 and 255\n");
 473             return SIM_RC_FAIL;
 474           }
 475         fill_byte_value = (unsigned8) fill_value;
 476         fill_byte_flag = 1;
 477         return SIM_RC_OK;
 478         break;
 479       }
 480
 481     case OPTION_MEMORY_MAPFILE:
 482       {
 483         if (mmap_next_fd >= 0)
 484           {
 485             sim_io_eprintf (sd, "Duplicate memory-mapfile option\n");
 486             return SIM_RC_FAIL;
 487           }
 488
 489         mmap_next_fd = open (arg, O_RDWR);
 490         if (mmap_next_fd < 0)
 491           {
 492             sim_io_eprintf (sd, "Cannot open file `%s': %s\n",
 493                             arg, strerror (errno));
 494             return SIM_RC_FAIL;
 495           }
 496
 497         return SIM_RC_OK;
 498       }
 499
 500     case OPTION_MEMORY_INFO:
 501       {
 502         sim_memopt *entry;
 503         sim_io_printf (sd, "Memory maps:\n");
 504         for (entry = STATE_MEMOPT (sd); entry != NULL; entry = entry->next)
 505           {
 506             sim_memopt *alias;
 507             sim_io_printf (sd, " memory");
 508             if (entry->alias == NULL)
 509               sim_io_printf (sd, " region ");
 510             else
 511               sim_io_printf (sd, " alias ");
 512             if (entry->space != 0)
 513               sim_io_printf (sd, "0x%lx:", (long) entry->space);
 514             sim_io_printf (sd, "0x%08lx", (long) entry->addr);
 515             if (entry->level != 0)
 516               sim_io_printf (sd, "@0x%lx", (long) entry->level);
 517             sim_io_printf (sd, ",0x%lx",
 518                            (long) entry->nr_bytes);
 519             if (entry->modulo != 0)
 520               sim_io_printf (sd, "%%0x%lx", (long) entry->modulo);
 521             for (alias = entry->alias;
 522                  alias != NULL;
 523                  alias = alias->next)
 524               {
 525                 if (alias->space != 0)
 526                   sim_io_printf (sd, "0x%lx:", (long) alias->space);
 527                 sim_io_printf (sd, ",0x%08lx", (long) alias->addr);
 528                 if (alias->level != 0)
 529                   sim_io_printf (sd, "@0x%lx", (long) alias->level);
 530               }
 531             sim_io_printf (sd, "\n");
 532           }
 533         return SIM_RC_OK;
 534         break;
 535       }
 536
 537     case OPTION_MAP_INFO:
 538       {
 539         sim_core *memory = STATE_CORE (sd);
 540         unsigned nr_map;
 541
 542         for (nr_map = 0; nr_map < nr_maps; ++nr_map)
 543           {
 544             sim_core_map *map = &memory->common.map[nr_map];
 545             sim_core_mapping *mapping = map->first;
 546
 547             if (!mapping)
 548               continue;
 549
 550             sim_io_printf (sd, "%s maps:\n", map_to_str (nr_map));
 551             do
 552               {
 553                 unsigned modulo;
 554
 555                 sim_io_printf (sd, " map ");
 556                 if (mapping->space != 0)
 557                   sim_io_printf (sd, "0x%x:", mapping->space);
 558                 sim_io_printf (sd, "0x%08lx", (long) mapping->base);
 559                 if (mapping->level != 0)
 560                   sim_io_printf (sd, "@0x%x", mapping->level);
 561                 sim_io_printf (sd, ",0x%lx", (long) mapping->nr_bytes);
 562                 modulo = mapping->mask + 1;
 563                 if (modulo != 0)
 564                   sim_io_printf (sd, "%%0x%x", modulo);
 565                 sim_io_printf (sd, "\n");
 566
 567                 mapping = mapping->next;
 568               }
 569             while (mapping);
 570           }
 571
 572         return SIM_RC_OK;
 573         break;
 574       }
 575
 576     default:
 577       sim_io_eprintf (sd, "Unknown memory option %d\n", opt);
 578       return SIM_RC_FAIL;
 579
 580     }
 581
 582   return SIM_RC_FAIL;
 583 }
 584
 585
 586 /* "memory" module install handler.
 587
 588    This is called via sim_module_install to install the "memory" subsystem
 589    into the simulator.  */
 590
 591 static MODULE_INIT_FN sim_memory_init;
 592 static MODULE_UNINSTALL_FN sim_memory_uninstall;
 593
 594 SIM_RC
 595 sim_memopt_install (SIM_DESC sd)
 596 {
 597   SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
 598   sim_add_option_table (sd, NULL, memory_options);
 599   sim_module_add_uninstall_fn (sd, sim_memory_uninstall);
 600   sim_module_add_init_fn (sd, sim_memory_init);
 601   return SIM_RC_OK;
 602 }
 603
 604
 605 /* Uninstall the "memory" subsystem from the simulator.  */
 606
 607 static void
 608 sim_memory_uninstall (SIM_DESC sd)
 609 {
 610   sim_memopt **entry = &STATE_MEMOPT (sd);
 611   sim_memopt *alias;
 612
 613   while ((*entry) != NULL)
 614     {
 615       /* delete any buffer */
 616       if ((*entry)->buffer != NULL)
 617         {
 618 #ifdef HAVE_MUNMAP
 619           if ((*entry)->munmap_length > 0)
 620             munmap ((*entry)->buffer, (*entry)->munmap_length);
 621           else
 622 #endif
 623             free ((*entry)->buffer);
 624         }
 625
 626       /* delete it and its aliases */
 627       alias = *entry;
 628
 629       /* next victim */
 630       *entry = (*entry)->next;
 631
 632       while (alias != NULL)
 633         {
 634           sim_memopt *dead = alias;
 635           alias = alias->alias;
 636           sim_core_detach (sd, NULL, dead->level, dead->space, dead->addr);
 637           free (dead);
 638         }
 639     }
 640 }
 641
 642
 643 static SIM_RC
 644 sim_memory_init (SIM_DESC sd)
 645 {
 646   /* Reinitialize option modifier flags, in case they were left
 647      over from a previous sim startup event.  */
 648   fill_byte_flag = 0;
 649   mmap_next_fd = -1;
 650
 651   return SIM_RC_OK;
 652 }