src/runtime/save.c

   1 /*
   2  * This software is part of the SBCL system. See the README file for
   3  * more information.
   4  *
   5  * This software is derived from the CMU CL system, which was
   6  * written at Carnegie Mellon University and released into the
   7  * public domain. The software is in the public domain and is
   8  * provided with absolutely no warranty. See the COPYING and CREDITS
   9  * files for more information.
  10  */
  11
  12 #ifndef LISP_FEATURE_WIN32
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15 #endif
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <string.h>
  19 #include <sys/file.h>
  20
  21 #include "sbcl.h"
  22 #if defined(LISP_FEATURE_WIN32) && defined(LISP_FEATURE_SB_THREAD)
  23 #include "pthreads_win32.h"
  24 #else
  25 #include <signal.h>
  26 #endif
  27 #include "runtime.h"
  28 #include "os.h"
  29 #include "core.h"
  30 #include "globals.h"
  31 #include "save.h"
  32 #include "dynbind.h"
  33 #include "lispregs.h"
  34 #include "validate.h"
  35 #include "gc-internal.h"
  36 #include "thread.h"
  37 #include "arch.h"
  38
  39 #include "genesis/static-symbols.h"
  40 #include "genesis/symbol.h"
  41
  42 #ifdef LISP_FEATURE_SB_CORE_COMPRESSION
  43 # include <zlib.h>
  44 #endif
  45
  46 /* write_runtime_options uses a simple serialization scheme that
  47  * consists of one word of magic, one word indicating whether options
  48  * are actually saved, and one word per struct field. */
  49 static void
  50 write_runtime_options(FILE *file, struct runtime_options *options)
  51 {
  52     size_t optarray[RUNTIME_OPTIONS_WORDS];
  53
  54     memset(&optarray, 0, sizeof(optarray));
  55     optarray[0] = RUNTIME_OPTIONS_MAGIC;
  56
  57     if (options != NULL) {
  58         /* optarray[1] is a flag indicating that options are present */
  59         optarray[1] = 1;
  60         optarray[2] = options->dynamic_space_size;
  61         optarray[3] = options->thread_control_stack_size;
  62     }
  63
  64     if (RUNTIME_OPTIONS_WORDS !=
  65         fwrite(optarray, sizeof(size_t), RUNTIME_OPTIONS_WORDS, file)) {
  66         perror("Error writing runtime options to file");
  67     }
  68 }
  69
  70 static void
  71 write_lispobj(lispobj obj, FILE *file)
  72 {
  73     if (1 != fwrite(&obj, sizeof(lispobj), 1, file)) {
  74         perror("Error writing to file");
  75     }
  76 }
  77
  78 static void
  79 write_bytes_to_file(FILE * file, char *addr, long bytes, int compression)
  80 {
  81     if (compression == COMPRESSION_LEVEL_NONE) {
  82         while (bytes > 0) {
  83             sword_t count = fwrite(addr, 1, bytes, file);
  84             if (count > 0) {
  85                 bytes -= count;
  86                 addr += count;
  87             }
  88             else {
  89                 perror("error writing to core file");
  90                 lose("core file is incomplete or corrupt\n");
  91             }
  92         }
  93 #ifdef LISP_FEATURE_SB_CORE_COMPRESSION
  94     } else if ((compression >= -1) && (compression <= 9)) {
  95 # define ZLIB_BUFFER_SIZE (1u<<16)
  96         z_stream stream;
  97         unsigned char buf[ZLIB_BUFFER_SIZE];
  98         unsigned char * written, * end;
  99         long total_written = 0;
 100         int ret;
 101         stream.zalloc = NULL;
 102         stream.zfree = NULL;
 103         stream.opaque = NULL;
 104         stream.avail_in = bytes;
 105         stream.next_in  = (void*)addr;
 106         ret = deflateInit(&stream, compression);
 107         if (ret != Z_OK)
 108             lose("deflateInit: %i\n", ret);
 109         do {
 110             stream.avail_out = sizeof(buf);
 111             stream.next_out = buf;
 112             ret = deflate(&stream, Z_FINISH);
 113             if (ret < 0) lose("zlib deflate error: %i... exiting\n", ret);
 114             written = buf;
 115             end     = buf+sizeof(buf)-stream.avail_out;
 116             total_written += end - written;
 117             while (written < end) {
 118                 long count = fwrite(written, 1, end-written, file);
 119                 if (count > 0) {
 120                     written += count;
 121                 } else {
 122                     perror("error writing to core file");
 123                     lose("core file is incomplete or corrupt\n");
 124                 }
 125             }
 126         } while (stream.avail_out == 0);
 127         deflateEnd(&stream);
 128         printf("compressed %lu bytes into %lu at level %i\n",
 129                bytes, total_written, compression);
 130 # undef ZLIB_BUFFER_SIZE
 131 #endif
 132     } else {
 133 #ifdef LISP_FEATURE_SB_CORE_COMPRESSION
 134         lose("Unknown core compression level %i, exiting\n", compression);
 135 #else
 136         lose("zlib-compressed core support not built in this runtime\n");
 137 #endif
 138     }
 139
 140     if (fflush(file) != 0) {
 141       perror("error writing to core file");
 142       lose("core file is incomplete or corrupt\n");
 143     }
 144 };
 145
 146
 147 static long
 148 write_and_compress_bytes(FILE *file, char *addr, long bytes, os_vm_offset_t file_offset,
 149                          int compression)
 150 {
 151     long here, data;
 152
 153     bytes = (bytes+os_vm_page_size-1)&~(os_vm_page_size-1);
 154
 155 #ifdef LISP_FEATURE_WIN32
 156     long count;
 157     /* touch every single page in the space to force it to be mapped. */
 158     for (count = 0; count < bytes; count += 0x1000) {
 159         volatile int temp = addr[count];
 160     }
 161 #endif
 162
 163     fflush(file);
 164     here = ftell(file);
 165     fseek(file, 0, SEEK_END);
 166     data = (ftell(file)+os_vm_page_size-1)&~(os_vm_page_size-1);
 167     fseek(file, data, SEEK_SET);
 168     write_bytes_to_file(file, addr, bytes, compression);
 169     fseek(file, here, SEEK_SET);
 170     return ((data - file_offset) / os_vm_page_size) - 1;
 171 }
 172
 173 static long __attribute__((__unused__))
 174 write_bytes(FILE *file, char *addr, long bytes, os_vm_offset_t file_offset)
 175 {
 176     return write_and_compress_bytes(file, addr, bytes, file_offset,
 177                                     COMPRESSION_LEVEL_NONE);
 178 }
 179
 180 static void
 181 output_space(FILE *file, int id, lispobj *addr, lispobj *end,
 182              os_vm_offset_t file_offset,
 183              int core_compression_level)
 184 {
 185     size_t words, bytes, data, compressed_flag;
 186     static char *names[] = {NULL, "dynamic", "static", "read-only",
 187                             "immobile", "immobile"};
 188
 189     compressed_flag
 190             = ((core_compression_level != COMPRESSION_LEVEL_NONE)
 191                ? DEFLATED_CORE_SPACE_ID_FLAG : 0);
 192
 193     write_lispobj(id | compressed_flag, file);
 194     words = end - addr;
 195     write_lispobj(words, file);
 196
 197     bytes = words * sizeof(lispobj);
 198
 199     printf("writing %lu bytes from the %s space at %p\n",
 200            (uword_t)bytes, names[id], addr);
 201
 202     data = write_and_compress_bytes(file, (char *)addr, bytes, file_offset,
 203                                     core_compression_level);
 204
 205     write_lispobj(data, file);
 206     write_lispobj((uword_t)addr / os_vm_page_size, file);
 207     write_lispobj((bytes + os_vm_page_size - 1) / os_vm_page_size, file);
 208 }
 209
 210 FILE *
 211 open_core_for_saving(char *filename)
 212 {
 213     /* Open the output file. We don't actually need the file yet, but
 214      * the fopen() might fail for some reason, and we want to detect
 215      * that and back out before we do anything irreversible. */
 216     unlink(filename);
 217     return fopen(filename, "wb");
 218 }
 219
 220 #ifdef LISP_FEATURE_IMMOBILE_SPACE
 221 extern void prepare_immobile_space_for_save();
 222 #  define N_SPACES_TO_SAVE 5
 223 #  ifdef LISP_FEATURE_IMMOBILE_CODE
 224 lispobj code_component_order;
 225 extern void defrag_immobile_space(lispobj);
 226 #  endif
 227 #else
 228 #  define N_SPACES_TO_SAVE 3
 229 #endif
 230 boolean
 231 save_to_filehandle(FILE *file, char *filename, lispobj init_function,
 232                    boolean make_executable,
 233                    boolean save_runtime_options,
 234                    int core_compression_level)
 235 {
 236     struct thread *th;
 237     os_vm_offset_t core_start_pos;
 238
 239 #ifdef LISP_FEATURE_X86_64
 240     untune_asm_routines_for_microarch();
 241 #endif
 242
 243     /* Smash the enclosing state. (Once we do this, there's no good
 244      * way to go back, which is a sufficient reason that this ends up
 245      * being SAVE-LISP-AND-DIE instead of SAVE-LISP-AND-GO-ON). */
 246     printf("[undoing binding stack and other enclosing state... ");
 247     fflush(stdout);
 248     for_each_thread(th) {       /* XXX really? */
 249         unbind_to_here((lispobj *)th->binding_stack_start,th);
 250         SetSymbolValue(CURRENT_CATCH_BLOCK, 0,th);
 251         SetSymbolValue(CURRENT_UNWIND_PROTECT_BLOCK, 0,th);
 252     }
 253     printf("done]\n");
 254     fflush(stdout);
 255 #ifdef LISP_FEATURE_IMMOBILE_CODE
 256     // It's better to wait to defrag until after the binding stack is undone,
 257     // because we explicitly don't fixup code refs from stacks.
 258     // i.e. if there *were* something on the binding stack that cared that code
 259     // moved, it would be wrong. This way we can be sure we don't care.
 260     if (code_component_order) {
 261         // Assert that defrag will not move the init_function
 262         gc_assert(!immobile_space_p(init_function));
 263         printf("[defragmenting immobile space... ");
 264         fflush(stdout);
 265         defrag_immobile_space(code_component_order);
 266         printf("done]\n");
 267     }
 268 #endif
 269
 270     /* (Now we can actually start copying ourselves into the output file.) */
 271
 272     printf("[saving current Lisp image into %s:\n", filename);
 273     fflush(stdout);
 274
 275     core_start_pos = ftell(file);
 276     write_lispobj(CORE_MAGIC, file);
 277
 278     write_lispobj(BUILD_ID_CORE_ENTRY_TYPE_CODE, file);
 279     write_lispobj(/* (We're writing the word count of the entry here, and the 2
 280           * term is one word for the leading BUILD_ID_CORE_ENTRY_TYPE_CODE
 281           * word and one word where we store the count itself.) */
 282          2 + strlen((const char *)build_id),
 283          file);
 284     {
 285         unsigned char *p;
 286         for (p = (unsigned char *)build_id; *p; ++p)
 287             write_lispobj(*p, file);
 288     }
 289
 290     write_lispobj(NEW_DIRECTORY_CORE_ENTRY_TYPE_CODE, file);
 291     write_lispobj(/* (word count = N spaces described by 5 words each, plus the
 292           * entry type code, plus this count itself) */
 293          (5*N_SPACES_TO_SAVE)+2, file);
 294     output_space(file,
 295                  READ_ONLY_CORE_SPACE_ID,
 296                  (lispobj *)READ_ONLY_SPACE_START,
 297                  (lispobj *)SymbolValue(READ_ONLY_SPACE_FREE_POINTER,0),
 298                  core_start_pos,
 299                  core_compression_level);
 300     output_space(file,
 301                  STATIC_CORE_SPACE_ID,
 302                  (lispobj *)STATIC_SPACE_START,
 303                  (lispobj *)SymbolValue(STATIC_SPACE_FREE_POINTER,0),
 304                  core_start_pos,
 305                  core_compression_level);
 306 #ifdef LISP_FEATURE_GENCGC
 307     /* Flush the current_region, updating the tables. */
 308     gc_alloc_update_all_page_tables(1);
 309     update_dynamic_space_free_pointer();
 310 #endif
 311 #ifdef LISP_FEATURE_IMMOBILE_SPACE
 312     prepare_immobile_space_for_save();
 313     output_space(file,
 314                  IMMOBILE_FIXEDOBJ_CORE_SPACE_ID,
 315                  (lispobj *)IMMOBILE_SPACE_START,
 316                  (lispobj *)SymbolValue(IMMOBILE_FIXEDOBJ_FREE_POINTER,0),
 317                  core_start_pos,
 318                  core_compression_level);
 319     output_space(file,
 320                  IMMOBILE_VARYOBJ_CORE_SPACE_ID,
 321                  (lispobj *)IMMOBILE_VARYOBJ_SUBSPACE_START,
 322                  (lispobj *)SymbolValue(IMMOBILE_SPACE_FREE_POINTER,0),
 323                  core_start_pos,
 324                  core_compression_level);
 325 #endif
 326 #ifdef reg_ALLOC
 327 #ifdef LISP_FEATURE_GENCGC
 328     output_space(file,
 329                  DYNAMIC_CORE_SPACE_ID,
 330                  (lispobj *)DYNAMIC_SPACE_START,
 331                  dynamic_space_free_pointer,
 332                  core_start_pos,
 333                  core_compression_level);
 334 #else
 335     output_space(file,
 336                  DYNAMIC_CORE_SPACE_ID,
 337                  (lispobj *)current_dynamic_space,
 338                  dynamic_space_free_pointer,
 339                  core_start_pos,
 340                  core_compression_level);
 341 #endif
 342 #else
 343     output_space(file,
 344                  DYNAMIC_CORE_SPACE_ID,
 345                  (lispobj *)DYNAMIC_SPACE_START,
 346                  (lispobj *)SymbolValue(ALLOCATION_POINTER,0),
 347                  core_start_pos,
 348                  core_compression_level);
 349 #endif
 350
 351     write_lispobj(INITIAL_FUN_CORE_ENTRY_TYPE_CODE, file);
 352     write_lispobj(3, file);
 353     write_lispobj(init_function, file);
 354
 355 #ifdef LISP_FEATURE_GENCGC
 356     {
 357         size_t size = (last_free_page*sizeof(sword_t)+os_vm_page_size-1)
 358             &~(os_vm_page_size-1);
 359         uword_t *data = calloc(size, 1);
 360         if (data) {
 361             uword_t word;
 362             sword_t offset;
 363             page_index_t i;
 364             for (i = 0; i < last_free_page; i++) {
 365                 /* Thanks to alignment requirements, the two low bits
 366                  * are always zero, so we can use them to store the
 367                  * allocation type -- region is always closed, so only
 368                  * the two low bits of allocation flags matter. */
 369                 word = page_table[i].scan_start_offset;
 370                 gc_assert((word & 0x03) == 0);
 371                 data[i] = word | (0x03 & page_table[i].allocated);
 372             }
 373             write_lispobj(PAGE_TABLE_CORE_ENTRY_TYPE_CODE, file);
 374             write_lispobj(4, file);
 375             write_lispobj(size, file);
 376             offset = write_bytes(file, (char *)data, size, core_start_pos);
 377             write_lispobj(offset, file);
 378         }
 379     }
 380 #endif
 381
 382     write_lispobj(END_CORE_ENTRY_TYPE_CODE, file);
 383
 384     /* Write a trailing header, ignored when parsing the core normally.
 385      * This is used to locate the start of the core when the runtime is
 386      * prepended to it. */
 387     fseek(file, 0, SEEK_END);
 388
 389     /* If NULL runtime options are passed to write_runtime_options,
 390      * command-line processing is performed as normal in the SBCL
 391      * executable. Otherwise, the saved runtime options are used and
 392      * all command-line arguments are available to Lisp in
 393      * SB-EXT:*POSIX-ARGV*. */
 394     write_runtime_options(file,
 395                           (save_runtime_options ? runtime_options : NULL));
 396
 397     if (1 != fwrite(&core_start_pos, sizeof(os_vm_offset_t), 1, file)) {
 398         perror("Error writing core starting position to file");
 399         fclose(file);
 400     } else {
 401         write_lispobj(CORE_MAGIC, file);
 402         fclose(file);
 403     }
 404
 405 #ifndef LISP_FEATURE_WIN32
 406     if (make_executable)
 407         chmod (filename, 0755);
 408 #endif
 409
 410     printf("done]\n");
 411     exit(0);
 412 }
 413 #undef N_SPACES_TO_SAVE
 414
 415 /* Check if the build_id for the current runtime is present in a
 416  * buffer. */
 417 int
 418 check_runtime_build_id(void *buf, size_t size)
 419 {
 420     size_t idlen;
 421     char *pos;
 422
 423     idlen = strlen((const char*)build_id) - 1;
 424     while ((pos = memchr(buf, build_id[0], size)) != NULL) {
 425         size -= (pos + 1) - (char *)buf;
 426         buf = (pos + 1);
 427         if (idlen <= size && memcmp(buf, build_id + 1, idlen) == 0)
 428             return 1;
 429     }
 430
 431     return 0;
 432 }
 433
 434 /* Slurp the executable portion of the runtime into a malloced buffer
 435  * and return it.  Places the size in bytes of the runtime into
 436  * 'size_out'.  Returns NULL if the runtime cannot be loaded from
 437  * 'runtime_path'. */
 438 void *
 439 load_runtime(char *runtime_path, size_t *size_out)
 440 {
 441     void *buf = NULL;
 442     FILE *input = NULL;
 443     size_t size, count;
 444     os_vm_offset_t core_offset;
 445
 446     core_offset = search_for_embedded_core (runtime_path);
 447     if ((input = fopen(runtime_path, "rb")) == NULL) {
 448         fprintf(stderr, "Unable to open runtime: %s\n", runtime_path);
 449         goto lose;
 450     }
 451
 452     fseek(input, 0, SEEK_END);
 453     size = (size_t) ftell(input);
 454     fseek(input, 0, SEEK_SET);
 455
 456     if (core_offset != -1 && size > (size_t) core_offset)
 457         size = core_offset;
 458
 459     buf = successful_malloc(size);
 460     if ((count = fread(buf, 1, size, input)) != size) {
 461         fprintf(stderr, "Premature EOF while reading runtime.\n");
 462         goto lose;
 463     }
 464
 465     if (!check_runtime_build_id(buf, size)) {
 466         fprintf(stderr, "Failed to locate current build_id in runtime: %s\n",
 467             runtime_path);
 468         goto lose;
 469     }
 470
 471     fclose(input);
 472     *size_out = size;
 473     return buf;
 474
 475 lose:
 476     if (input != NULL)
 477         fclose(input);
 478     if (buf != NULL)
 479         free(buf);
 480     return NULL;
 481 }
 482
 483 boolean
 484 save_runtime_to_filehandle(FILE *output, void *runtime, size_t runtime_size,
 485                            int application_type)
 486 {
 487     size_t padding;
 488     void *padbytes;
 489
 490 #ifdef LISP_FEATURE_WIN32
 491     {
 492         PIMAGE_DOS_HEADER dos_header = (PIMAGE_DOS_HEADER)runtime;
 493         PIMAGE_NT_HEADERS nt_header = (PIMAGE_NT_HEADERS)((char *)dos_header +
 494                                                           dos_header->e_lfanew);
 495
 496         int sub_system;
 497         switch (application_type) {
 498         case 0:
 499             sub_system = IMAGE_SUBSYSTEM_WINDOWS_CUI;
 500             break;
 501         case 1:
 502             sub_system = IMAGE_SUBSYSTEM_WINDOWS_GUI;
 503             break;
 504         default:
 505             fprintf(stderr, "Invalid application type %d\n", application_type);
 506             return 0;
 507         }
 508
 509         nt_header->OptionalHeader.Subsystem = sub_system;
 510     }
 511 #endif
 512
 513     if (runtime_size != fwrite(runtime, 1, runtime_size, output)) {
 514         perror("Error saving runtime");
 515         return 0;
 516     }
 517
 518     padding = (os_vm_page_size - (runtime_size % os_vm_page_size)) & ~os_vm_page_size;
 519     if (padding > 0) {
 520         padbytes = successful_malloc(padding);
 521         memset(padbytes, 0, padding);
 522         if (padding != fwrite(padbytes, 1, padding, output)) {
 523             perror("Error saving runtime");
 524             free(padbytes);
 525             return 0;
 526         }
 527         free(padbytes);
 528     }
 529
 530     return 1;
 531 }
 532
 533 FILE *
 534 prepare_to_save(char *filename, boolean prepend_runtime, void **runtime_bytes,
 535                 size_t *runtime_size)
 536 {
 537     FILE *file;
 538     char *runtime_path;
 539
 540     if (prepend_runtime) {
 541         runtime_path = os_get_runtime_executable_path(0);
 542
 543         if (runtime_path == NULL && saved_runtime_path == NULL) {
 544             fprintf(stderr, "Unable to get default runtime path.\n");
 545             return NULL;
 546         }
 547
 548         if (runtime_path == NULL)
 549             *runtime_bytes = load_runtime(saved_runtime_path, runtime_size);
 550         else {
 551             *runtime_bytes = load_runtime(runtime_path, runtime_size);
 552             free(runtime_path);
 553         }
 554
 555         if (*runtime_bytes == NULL)
 556             return 0;
 557     }
 558
 559     file = open_core_for_saving(filename);
 560     if (file == NULL) {
 561         free(*runtime_bytes);
 562         perror(filename);
 563         return NULL;
 564     }
 565
 566     return file;
 567 }
 568
 569 boolean
 570 save(char *filename, lispobj init_function, boolean prepend_runtime,
 571      boolean save_runtime_options, boolean compressed, int compression_level,
 572      int application_type)
 573 {
 574     FILE *file;
 575     void *runtime_bytes = NULL;
 576     size_t runtime_size;
 577
 578     file = prepare_to_save(filename, prepend_runtime, &runtime_bytes, &runtime_size);
 579     if (file == NULL)
 580         return 1;
 581
 582     if (prepend_runtime)
 583         save_runtime_to_filehandle(file, runtime_bytes, runtime_size, application_type);
 584
 585     return save_to_filehandle(file, filename, init_function, prepend_runtime,
 586                               save_runtime_options,
 587                               compressed ? compressed : COMPRESSION_LEVEL_NONE);
 588 }