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Sourcecode: sbcl version File versions

coreparse.c

/*
 * A saved SBCL system is a .core file; the code here helps us accept
 * such a file as input.
 */
  
/*
 * This software is part of the SBCL system. See the README file for
 * more information.
 *
 * This software is derived from the CMU CL system, which was
 * written at Carnegie Mellon University and released into the
 * public domain. The software is in the public domain and is
 * provided with absolutely no warranty. See the COPYING and CREDITS
 * files for more information.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#ifdef irix
#include <fcntl.h>
#endif

#include "sbcl.h"
#include "os.h"
#include "runtime.h"
#include "globals.h"
#include "core.h"
#include "arch.h"
#include "interr.h"
#include "thread.h"

unsigned char build_id[] =
#include "../../output/build-id.tmp"
;

static void
process_directory(int fd, u32 *ptr, int count)
{
    struct ndir_entry *entry;

    FSHOW((stderr, "/process_directory(..), count=%d\n", count));
    
    for (entry = (struct ndir_entry *) ptr; --count>= 0; ++entry) {

      long id = entry->identifier;
      long offset = os_vm_page_size * (1 + entry->data_page);
      os_vm_address_t addr =
          (os_vm_address_t) (os_vm_page_size * entry->address);
      lispobj *free_pointer = (lispobj *) addr + entry->nwords;
      long len = os_vm_page_size * entry->page_count;
      
      if (len != 0) {
          os_vm_address_t real_addr;
          FSHOW((stderr, "/mapping %ld(0x%lx) bytes at 0x%lx\n",
               (long)len, (long)len, addr));
          real_addr = os_map(fd, offset, addr, len);
          if (real_addr != addr) {
            lose("file mapped in wrong place! "
                 "(0x%08x != 0x%08lx)",
                 real_addr,
                 addr);
          }
      }

      FSHOW((stderr, "/space id = %d, free pointer = 0x%08x\n",
             id, (long)free_pointer));

      switch (id) {
      case DYNAMIC_CORE_SPACE_ID:
#ifdef LISP_FEATURE_GENCGC      
          if (addr != (os_vm_address_t)DYNAMIC_SPACE_START) {
              fprintf(stderr, "in core: 0x%lx; in runtime: 0x%lx \n",
                  (long)addr, (long)DYNAMIC_SPACE_START);
            lose("core/runtime address mismatch: DYNAMIC_SPACE_START");
          }
#else
          if ((addr != (os_vm_address_t)DYNAMIC_0_SPACE_START) &&
            (addr != (os_vm_address_t)DYNAMIC_1_SPACE_START)) {
            fprintf(stderr, "in core: 0x%lx; in runtime: 0x%lx or 0x%lx\n",
                  (long)addr,
                  (long)DYNAMIC_0_SPACE_START,
                  (long)DYNAMIC_1_SPACE_START);
            lose("warning: core/runtime address mismatch: DYNAMIC_SPACE_START");
          }
#endif
#if defined(ALLOCATION_POINTER)
          SetSymbolValue(ALLOCATION_POINTER, (lispobj)free_pointer,0);
#else
          dynamic_space_free_pointer = free_pointer;
#endif
          /* For stop-and-copy GC, this will be whatever the GC was
           * using at the time. With GENCGC, this will always be
           * space 0. (We checked above that for GENCGC,
           * addr==DYNAMIC_SPACE_START.) */
          current_dynamic_space = (lispobj *)addr;
          break;
      case STATIC_CORE_SPACE_ID:
          if (addr != (os_vm_address_t)STATIC_SPACE_START) {
            fprintf(stderr, "in core: 0x%lx - in runtime: 0x%lx\n",
                  (long)addr, (long)STATIC_SPACE_START);
            lose("core/runtime address mismatch: STATIC_SPACE_START");
          }
          break;
      case READ_ONLY_CORE_SPACE_ID:
          if (addr != (os_vm_address_t)READ_ONLY_SPACE_START) {
            fprintf(stderr, "in core: 0x%lx - in runtime: 0x%lx\n",
                  (long)addr, (long)READ_ONLY_SPACE_START);
            lose("core/runtime address mismatch: READ_ONLY_SPACE_START");
          }
          break;
      default:
          lose("unknown space ID %ld addr 0x%p", id);
      }
    }
}

lispobj
load_core_file(char *file)
{
    lispobj *header, val, len, *ptr, remaining_len;
    int fd = open(file, O_RDONLY), count;

    lispobj initial_function = NIL;
    FSHOW((stderr, "/entering load_core_file(%s)\n", file));
    if (fd < 0) {
      fprintf(stderr, "could not open file \"%s\"\n", file);
      perror("open");
      exit(1);
    }

    header = calloc(os_vm_page_size / sizeof(u32), sizeof(u32));

    count = read(fd, header, os_vm_page_size);
    if (count < os_vm_page_size) {
      lose("premature end of core file");
    }
    SHOW("successfully read first page of core");

    ptr = header;
    val = *ptr++;

    if (val != CORE_MAGIC) {
      lose("invalid magic number in core: 0x%lx should have been 0x%x.",
           val,
           CORE_MAGIC);
    }
    SHOW("found CORE_MAGIC");

    while (val != END_CORE_ENTRY_TYPE_CODE) {
      val = *ptr++;
      len = *ptr++;
      remaining_len = len - 2; /* (-2 to cancel the two ++ operations) */
      FSHOW((stderr, "/val=0x%ld, remaining_len=0x%ld\n",
             (long)val, (long)remaining_len));

      switch (val) {

      case END_CORE_ENTRY_TYPE_CODE:
          SHOW("END_CORE_ENTRY_TYPE_CODE case");
          break;

      case VERSION_CORE_ENTRY_TYPE_CODE:
          SHOW("VERSION_CORE_ENTRY_TYPE_CODE case");
          if (*ptr != SBCL_CORE_VERSION_INTEGER) {
            lose("core file version (%d) != runtime library version (%d)",
                 *ptr,
                 SBCL_CORE_VERSION_INTEGER);
          }
          break;

      case BUILD_ID_CORE_ENTRY_TYPE_CODE:
          SHOW("BUILD_ID_CORE_ENTRY_TYPE_CODE case");
          {
            int i;

            FSHOW((stderr, "build_id[]=\"%s\"\n", build_id));
            FSHOW((stderr, "remaining_len = %d\n", remaining_len));
            if (remaining_len != strlen(build_id))
                goto losing_build_id;
            for (i = 0; i < remaining_len; ++i) {
                FSHOW((stderr, "ptr[%d] = char = %d, expected=%d\n",
                     i, ptr[i], build_id[i]));
                if (ptr[i] != build_id[i])
                  goto losing_build_id;
            }
            break;
          losing_build_id:
            /* .core files are not binary-compatible between
             * builds because we can't easily detect whether the
             * sources were patched between the time the
             * dumping-the-.core runtime was built and the time
             * that the loading-the-.core runtime was built.
             *
             * (We could easily detect whether version.lisp-expr
             * was changed, but people experimenting with patches
             * don't necessarily update version.lisp-expr.) */

            lose("can't load .core for different runtime, sorry");
          } 

      case NEW_DIRECTORY_CORE_ENTRY_TYPE_CODE:
          SHOW("NEW_DIRECTORY_CORE_ENTRY_TYPE_CODE case");
          process_directory(fd,
                        ptr,
#ifndef alpha
                        remaining_len / (sizeof(struct ndir_entry) /
                                     sizeof(long))
#else
                        remaining_len / (sizeof(struct ndir_entry) /
                                     sizeof(u32))
#endif
                        );
          break;

      case INITIAL_FUN_CORE_ENTRY_TYPE_CODE:
          SHOW("INITIAL_FUN_CORE_ENTRY_TYPE_CODE case");
          initial_function = (lispobj)*ptr;
          break;

      default:
          lose("unknown core file entry: %ld", (long)val);
      }

      ptr += remaining_len;
      FSHOW((stderr, "/new ptr=%x\n", ptr));
    }
    SHOW("about to free(header)");
    free(header);
    SHOW("returning from load_core_file(..)");
    return initial_function;
}

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