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 <stdlib.h>
  19 #include <sys/file.h>
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24
  25 #ifdef irix
  26 #include <fcntl.h>
  27 #endif
  28
  29 #include "os.h"
  30 #include "runtime.h"
  31 #include "globals.h"
  32 #include "core.h"
  33 #include "arch.h"
  34 #include "interr.h"
  35 #include "sbcl.h"
  36 #include "genesis/symbol.h"
  37 #include "genesis/static-symbols.h"
  38
  39 unsigned char build_id[] =
  40 #include "../../output/build-id.tmp"
  41 ;
  42
  43 static void
  44 process_directory(int fd, u32 *ptr, int count)
  45 {
  46     struct ndir_entry *entry;
  47
  48     FSHOW((stderr, "/process_directory(..), count=%d\n", count));
  49
  50     for (entry = (struct ndir_entry *) ptr; --count>= 0; ++entry) {
  51
  52         long id = entry->identifier;
  53         long offset = os_vm_page_size * (1 + entry->data_page);
  54         os_vm_address_t addr =
  55             (os_vm_address_t) (os_vm_page_size * entry->address);
  56         lispobj *free_pointer = (lispobj *) addr + entry->nwords;
  57         long len = os_vm_page_size * entry->page_count;
  58
  59         if (len != 0) {
  60             os_vm_address_t real_addr;
  61             FSHOW((stderr, "/mapping %ld(0x%lx) bytes at 0x%lx\n",
  62                    (long)len, (long)len, addr));
  63             real_addr = os_map(fd, offset, addr, len);
  64             if (real_addr != addr) {
  65                 lose("file mapped in wrong place! "
  66                      "(0x%08x != 0x%08lx)",
  67                      real_addr,
  68                      addr);
  69             }
  70         }
  71
  72         FSHOW((stderr, "/space id = %d, free pointer = 0x%08x\n",
  73                id, (long)free_pointer));
  74
  75         switch (id) {
  76         case DYNAMIC_CORE_SPACE_ID:
  77 #ifdef LISP_FEATURE_GENCGC
  78             if (addr != (os_vm_address_t)DYNAMIC_SPACE_START) {
  79                 fprintf(stderr, "in core: 0x%lx; in runtime: 0x%lx \n",
  80                         (long)addr, (long)DYNAMIC_SPACE_START);
  81                 lose("core/runtime address mismatch: DYNAMIC_SPACE_START");
  82             }
  83 #else
  84             if ((addr != (os_vm_address_t)DYNAMIC_0_SPACE_START) &&
  85                 (addr != (os_vm_address_t)DYNAMIC_1_SPACE_START)) {
  86                 fprintf(stderr, "in core: 0x%lx; in runtime: 0x%lx or 0x%lx\n",
  87                         (long)addr,
  88                         (long)DYNAMIC_0_SPACE_START,
  89                         (long)DYNAMIC_1_SPACE_START);
  90                 lose("warning: core/runtime address mismatch: DYNAMIC_SPACE_START");
  91             }
  92 #endif
  93 /* FIXME: Should the conditional here be reg_ALLOC instead of
  94  *   defined(__i386__)
  95  * ? */
  96 #if defined(LISP_FEATURE_X86)
  97             SetSymbolValue(ALLOCATION_POINTER, (lispobj)free_pointer);
  98 #else
  99             dynamic_space_free_pointer = free_pointer;
 100 #endif
 101             /* For stop-and-copy GC, this will be whatever the GC was
 102              * using at the time. With GENCGC, this will always be
 103              * space 0. (We checked above that for GENCGC,
 104              * addr==DYNAMIC_SPACE_START.) */
 105             current_dynamic_space = (lispobj *)addr;
 106             break;
 107         case STATIC_CORE_SPACE_ID:
 108             if (addr != (os_vm_address_t)STATIC_SPACE_START) {
 109                 fprintf(stderr, "in core: 0x%lx - in runtime: 0x%lx\n",
 110                         (long)addr, (long)STATIC_SPACE_START);
 111                 lose("core/runtime address mismatch: STATIC_SPACE_START");
 112             }
 113             break;
 114         case READ_ONLY_CORE_SPACE_ID:
 115             if (addr != (os_vm_address_t)READ_ONLY_SPACE_START) {
 116                 fprintf(stderr, "in core: 0x%lx - in runtime: 0x%lx\n",
 117                         (long)addr, (long)READ_ONLY_SPACE_START);
 118                 lose("core/runtime address mismatch: READ_ONLY_SPACE_START");
 119             }
 120             break;
 121         default:
 122             lose("unknown space ID %ld addr 0x%p", id);
 123         }
 124     }
 125 }
 126
 127 lispobj
 128 load_core_file(char *file)
 129 {
 130     u32 *header, val, len, *ptr, remaining_len;
 131     int fd = open(file, O_RDONLY), count;
 132
 133     lispobj initial_function = NIL;
 134     FSHOW((stderr, "/entering load_core_file(%s)\n", file));
 135     if (fd < 0) {
 136         fprintf(stderr, "could not open file \"%s\"\n", file);
 137         perror("open");
 138         exit(1);
 139     }
 140
 141     header = calloc(os_vm_page_size / sizeof(u32), sizeof(u32));
 142
 143     count = read(fd, header, os_vm_page_size);
 144     if (count < os_vm_page_size) {
 145         lose("premature end of core file");
 146     }
 147     SHOW("successfully read first page of core");
 148
 149     ptr = header;
 150     val = *ptr++;
 151
 152     if (val != CORE_MAGIC) {
 153         lose("invalid magic number in core: 0x%lx should have been 0x%x.",
 154              val,
 155              CORE_MAGIC);
 156     }
 157     SHOW("found CORE_MAGIC");
 158
 159     while (val != END_CORE_ENTRY_TYPE_CODE) {
 160         val = *ptr++;
 161         len = *ptr++;
 162         remaining_len = len - 2; /* (-2 to cancel the two ++ operations) */
 163         FSHOW((stderr, "/val=0x%ld, remaining_len=0x%ld\n",
 164                (long)val, (long)remaining_len));
 165
 166         switch (val) {
 167
 168         case END_CORE_ENTRY_TYPE_CODE:
 169             SHOW("END_CORE_ENTRY_TYPE_CODE case");
 170             break;
 171
 172         case VERSION_CORE_ENTRY_TYPE_CODE:
 173             SHOW("VERSION_CORE_ENTRY_TYPE_CODE case");
 174             if (*ptr != SBCL_CORE_VERSION_INTEGER) {
 175                 lose("core file version (%d) != runtime library version (%d)",
 176                      *ptr,
 177                      SBCL_CORE_VERSION_INTEGER);
 178             }
 179             break;
 180
 181         case BUILD_ID_CORE_ENTRY_TYPE_CODE:
 182             SHOW("BUILD_ID_CORE_ENTRY_TYPE_CODE case");
 183             {
 184                 int i;
 185
 186                 FSHOW((stderr, "build_id[]=\"%s\"\n", build_id));
 187                 FSHOW((stderr, "remaining_len = %d\n", remaining_len));
 188                 if (remaining_len != strlen(build_id))
 189                     goto losing_build_id;
 190                 for (i = 0; i < remaining_len; ++i) {
 191                     FSHOW((stderr, "ptr[%d] = char = %d, expected=%d\n",
 192                            i, ptr[i], build_id[i]));
 193                     if (ptr[i] != build_id[i])
 194                         goto losing_build_id;
 195                 }
 196                 break;
 197             losing_build_id:
 198                 /* .core files are not binary-compatible between
 199                  * builds because we can't easily detect whether the
 200                  * sources were patched between the time the
 201                  * dumping-the-.core runtime was built and the time
 202                  * that the loading-the-.core runtime was built.
 203                  *
 204                  * (We could easily detect whether version.lisp-expr
 205                  * was changed, but people experimenting with patches
 206                  * don't necessarily update version.lisp-expr.) */
 207
 208                 lose("can't load .core for different runtime, sorry");
 209             }
 210
 211         case NEW_DIRECTORY_CORE_ENTRY_TYPE_CODE:
 212             SHOW("NEW_DIRECTORY_CORE_ENTRY_TYPE_CODE case");
 213             process_directory(fd,
 214                               ptr,
 215 #ifndef alpha
 216                               remaining_len / (sizeof(struct ndir_entry) /
 217                                                sizeof(long))
 218 #else
 219                               remaining_len / (sizeof(struct ndir_entry) /
 220                                                sizeof(u32))
 221 #endif
 222                               );
 223             break;
 224
 225         case INITIAL_FUN_CORE_ENTRY_TYPE_CODE:
 226             SHOW("INITIAL_FUN_CORE_ENTRY_TYPE_CODE case");
 227             initial_function = (lispobj)*ptr;
 228             break;
 229
 230         default:
 231             lose("unknown core file entry: %ld", (long)val);
 232         }
 233
 234         ptr += remaining_len;
 235         FSHOW((stderr, "/new ptr=%x\n", ptr));
 236     }
 237     SHOW("about to free(header)");
 238     free(header);
 239     SHOW("returning from load_core_file(..)");
 240     return initial_function;
 241 }