src/runtime/coreparse.c

   1 /*
   2  * A saved SBCL system is a .core file; the code here helps us accept
   3  * such a file as input.
   4  */
   5
   6 /*
   7  * This software is part of the SBCL system. See the README file for
   8  * more information.
   9  *
  10  * This software is derived from the CMU CL system, which was
  11  * written at Carnegie Mellon University and released into the
  12  * public domain. The software is in the public domain and is
  13  * provided with absolutely no warranty. See the COPYING and CREDITS
  14  * files for more information.
  15  */
  16
  17 #include <stdio.h>
  18 #include <sys/types.h>
  19 #include <sys/file.h>
  20
  21 #ifdef irix
  22 #include <fcntl.h>
  23 #include <stdlib.h>
  24 #endif
  25
  26 #include "os.h"
  27 #include "runtime.h"
  28 #include "globals.h"
  29 #include "core.h"
  30 #include "arch.h"
  31 #include "interr.h"
  32 #include "sbcl.h"
  33
  34 static void
  35 process_directory(int fd, long *ptr, int count)
  36 {
  37     struct ndir_entry *entry;
  38
  39     FSHOW((stderr, "/process_directory(..), count=%d\n", count));
  40
  41     for (entry = (struct ndir_entry *) ptr; --count>= 0; ++entry) {
  42
  43         long id = entry->identifier;
  44         long offset = os_vm_page_size * (1 + entry->data_page);
  45         os_vm_address_t addr =
  46             (os_vm_address_t) (os_vm_page_size * entry->address);
  47         lispobj *free_pointer = (lispobj *) addr + entry->nwords;
  48         long len = os_vm_page_size * entry->page_count;
  49
  50         if (len != 0) {
  51             os_vm_address_t real_addr;
  52             FSHOW((stderr, "/mapping %ld(0x%lx) bytes at 0x%lx\n",
  53                    (long)len, (long)len, addr));
  54             real_addr = os_map(fd, offset, addr, len);
  55             if (real_addr != addr) {
  56                 lose("file mapped in wrong place! "
  57                      "(0x%08x != 0x%08lx)",
  58                      real_addr,
  59                      addr);
  60             }
  61         }
  62
  63         FSHOW((stderr, "/space id = %d, free pointer = 0x%08x\n",
  64                id, (long)free_pointer));
  65
  66         switch (id) {
  67         case DYNAMIC_SPACE_ID:
  68 #ifdef GENCGC
  69             if (addr != (os_vm_address_t)DYNAMIC_SPACE_START) {
  70                 fprintf(stderr, "in core: 0x%x - in runtime: 0x%x \n",
  71                         addr, (os_vm_address_t)DYNAMIC_SPACE_START);
  72                 lose("core/runtime address mismatch: DYNAMIC_SPACE_START");
  73             }
  74 #else
  75             if ((addr != (os_vm_address_t)DYNAMIC_0_SPACE_START) &&
  76                 (addr != (os_vm_address_t)DYNAMIC_1_SPACE_START)) {
  77                 fprintf(stderr, "in core: 0x%x - in runtime: 0x%x or 0x%x\n",
  78                         addr, (os_vm_address_t)DYNAMIC_0_SPACE_START,
  79                         (os_vm_address_t)DYNAMIC_1_SPACE_START);
  80                 lose("warning: core/runtime address mismatch: DYNAMIC_SPACE_START");
  81             }
  82 #endif
  83 /* FIXME: Should the conditional here be reg_ALLOC instead of
  84  *   defined(ibmrt) || defined(__i386__)
  85  * ? */
  86 #if defined(ibmrt) || defined(__i386__)
  87             SetSymbolValue(ALLOCATION_POINTER, (lispobj)free_pointer);
  88 #else
  89             dynamic_space_free_pointer = free_pointer;
  90 #endif
  91             /* For stop-and-copy GC, this will be whatever the GC was
  92              * using at the time. With GENCGC, this will always be
  93              * space 0. (We checked above that for GENCGC,
  94              * addr==DYNAMIC_SPACE_START.) */
  95             current_dynamic_space = (lispobj *)addr;
  96             break;
  97         case STATIC_SPACE_ID:
  98             if (addr != (os_vm_address_t)STATIC_SPACE_START) {
  99                 fprintf(stderr, "in core: 0x%p - in runtime: 0x%x\n",
 100                         addr, (os_vm_address_t)STATIC_SPACE_START);
 101                 lose("core/runtime address mismatch: STATIC_SPACE_START");
 102             }
 103             break;
 104         case READ_ONLY_SPACE_ID:
 105             if (addr != (os_vm_address_t)READ_ONLY_SPACE_START) {
 106                 fprintf(stderr, "in core: 0x%x - in runtime: 0x%x\n",
 107                         addr, (os_vm_address_t)READ_ONLY_SPACE_START);
 108                 lose("core/runtime address mismatch: READ_ONLY_SPACE_START");
 109             }
 110             break;
 111         default:
 112             lose("unknown space ID %ld addr 0x%p", id);
 113         }
 114     }
 115 }
 116
 117 lispobj
 118 load_core_file(char *file)
 119 {
 120     u32 *header, val, len, *ptr, remaining_len;
 121     int fd = open(file, O_RDONLY), count;
 122
 123     lispobj initial_function = NIL;
 124     FSHOW((stderr, "/entering load_core_file(%s)\n", file));
 125     if (fd < 0) {
 126         fprintf(stderr, "could not open file \"%s\"\n", file);
 127         perror("open");
 128         exit(1);
 129     }
 130
 131     header = calloc(os_vm_page_size / sizeof(u32), sizeof(u32));
 132
 133     count = read(fd, header, os_vm_page_size);
 134     if (count < os_vm_page_size) {
 135         lose("premature end of core file");
 136     }
 137     SHOW("successfully read first page of core");
 138
 139     ptr = header;
 140     val = *ptr++;
 141
 142     if (val != CORE_MAGIC) {
 143         lose("invalid magic number in core: 0x%lx should have been 0x%x.",
 144              val,
 145              CORE_MAGIC);
 146     }
 147     SHOW("found CORE_MAGIC");
 148
 149     while (val != CORE_END) {
 150         val = *ptr++;
 151         len = *ptr++;
 152         remaining_len = len - 2; /* (-2 to cancel the two ++ operations) */
 153         FSHOW((stderr, "/val=0x%ld, remaining_len=0x%ld\n",
 154                (long)val, (long)remaining_len));
 155
 156         switch (val) {
 157
 158         case CORE_END:
 159             SHOW("CORE_END case");
 160             break;
 161
 162         case CORE_VERSION:
 163             SHOW("CORE_VERSION case");
 164             if (*ptr != SBCL_CORE_VERSION_INTEGER) {
 165                 lose("core file version (%d) != runtime library version (%d)",
 166                      *ptr,
 167                      SBCL_CORE_VERSION_INTEGER);
 168             }
 169             break;
 170
 171         case CORE_NDIRECTORY:
 172             SHOW("CORE_NDIRECTORY case");
 173             process_directory(fd,
 174                               ptr,
 175 #ifndef alpha
 176                               remaining_len / (sizeof(struct ndir_entry) /
 177                                                sizeof(long))
 178 #else
 179                               remaining_len / (sizeof(struct ndir_entry) /
 180                                                sizeof(u32))
 181 #endif
 182                               );
 183             break;
 184
 185         case CORE_INITIAL_FUNCTION:
 186             SHOW("CORE_INITIAL_FUNCTION case");
 187             initial_function = (lispobj)*ptr;
 188             break;
 189
 190         default:
 191             lose("unknown core file entry: %ld", (long)val);
 192         }
 193
 194         ptr += remaining_len;
 195         FSHOW((stderr, "/new ptr=%x\n", ptr));
 196     }
 197     SHOW("about to free(header)");
 198     free(header);
 199     SHOW("returning from load_core_file(..)");
 200     return initial_function;
 201 }