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
  37 static void
  38 process_directory(int fd, u32 *ptr, int count)
  39 {
  40     struct ndir_entry *entry;
  41
  42     FSHOW((stderr, "/process_directory(..), count=%d\n", count));
  43
  44     for (entry = (struct ndir_entry *) ptr; --count>= 0; ++entry) {
  45
  46         long id = entry->identifier;
  47         long offset = os_vm_page_size * (1 + entry->data_page);
  48         os_vm_address_t addr =
  49             (os_vm_address_t) (os_vm_page_size * entry->address);
  50         lispobj *free_pointer = (lispobj *) addr + entry->nwords;
  51         long len = os_vm_page_size * entry->page_count;
  52
  53         if (len != 0) {
  54             os_vm_address_t real_addr;
  55             FSHOW((stderr, "/mapping %ld(0x%lx) bytes at 0x%lx\n",
  56                    (long)len, (long)len, addr));
  57             real_addr = os_map(fd, offset, addr, len);
  58             if (real_addr != addr) {
  59                 lose("file mapped in wrong place! "
  60                      "(0x%08x != 0x%08lx)",
  61                      real_addr,
  62                      addr);
  63             }
  64         }
  65
  66         FSHOW((stderr, "/space id = %d, free pointer = 0x%08x\n",
  67                id, (long)free_pointer));
  68
  69         switch (id) {
  70         case DYNAMIC_SPACE_ID:
  71 #ifdef GENCGC
  72             if (addr != (os_vm_address_t)DYNAMIC_SPACE_START) {
  73                 fprintf(stderr, "in core: 0x%lx; in runtime: 0x%lx \n",
  74                         (long)addr, (long)DYNAMIC_SPACE_START);
  75                 lose("core/runtime address mismatch: DYNAMIC_SPACE_START");
  76             }
  77 #else
  78             if ((addr != (os_vm_address_t)DYNAMIC_0_SPACE_START) &&
  79                 (addr != (os_vm_address_t)DYNAMIC_1_SPACE_START)) {
  80                 fprintf(stderr, "in core: 0x%lx; in runtime: 0x%lx or 0x%lx\n",
  81                         (long)addr,
  82                         (long)DYNAMIC_0_SPACE_START,
  83                         (long)DYNAMIC_1_SPACE_START);
  84                 lose("warning: core/runtime address mismatch: DYNAMIC_SPACE_START");
  85             }
  86 #endif
  87 /* FIXME: Should the conditional here be reg_ALLOC instead of
  88  *   defined(__i386__)
  89  * ? */
  90 #if defined(__i386__)
  91             SetSymbolValue(ALLOCATION_POINTER, (lispobj)free_pointer);
  92 #else
  93             dynamic_space_free_pointer = free_pointer;
  94 #endif
  95             /* For stop-and-copy GC, this will be whatever the GC was
  96              * using at the time. With GENCGC, this will always be
  97              * space 0. (We checked above that for GENCGC,
  98              * addr==DYNAMIC_SPACE_START.) */
  99             current_dynamic_space = (lispobj *)addr;
 100             break;
 101         case STATIC_SPACE_ID:
 102             if (addr != (os_vm_address_t)STATIC_SPACE_START) {
 103                 fprintf(stderr, "in core: 0x%lx - in runtime: 0x%lx\n",
 104                         (long)addr, (long)STATIC_SPACE_START);
 105                 lose("core/runtime address mismatch: STATIC_SPACE_START");
 106             }
 107             break;
 108         case READ_ONLY_SPACE_ID:
 109             if (addr != (os_vm_address_t)READ_ONLY_SPACE_START) {
 110                 fprintf(stderr, "in core: 0x%lx - in runtime: 0x%lx\n",
 111                         (long)addr, (long)READ_ONLY_SPACE_START);
 112                 lose("core/runtime address mismatch: READ_ONLY_SPACE_START");
 113             }
 114             break;
 115         default:
 116             lose("unknown space ID %ld addr 0x%p", id);
 117         }
 118     }
 119 }
 120
 121 lispobj
 122 load_core_file(char *file)
 123 {
 124     u32 *header, val, len, *ptr, remaining_len;
 125     int fd = open(file, O_RDONLY), count;
 126
 127     lispobj initial_function = NIL;
 128     FSHOW((stderr, "/entering load_core_file(%s)\n", file));
 129     if (fd < 0) {
 130         fprintf(stderr, "could not open file \"%s\"\n", file);
 131         perror("open");
 132         exit(1);
 133     }
 134
 135     header = calloc(os_vm_page_size / sizeof(u32), sizeof(u32));
 136
 137     count = read(fd, header, os_vm_page_size);
 138     if (count < os_vm_page_size) {
 139         lose("premature end of core file");
 140     }
 141     SHOW("successfully read first page of core");
 142
 143     ptr = header;
 144     val = *ptr++;
 145
 146     if (val != CORE_MAGIC) {
 147         lose("invalid magic number in core: 0x%lx should have been 0x%x.",
 148              val,
 149              CORE_MAGIC);
 150     }
 151     SHOW("found CORE_MAGIC");
 152
 153     while (val != CORE_END) {
 154         val = *ptr++;
 155         len = *ptr++;
 156         remaining_len = len - 2; /* (-2 to cancel the two ++ operations) */
 157         FSHOW((stderr, "/val=0x%ld, remaining_len=0x%ld\n",
 158                (long)val, (long)remaining_len));
 159
 160         switch (val) {
 161
 162         case CORE_END:
 163             SHOW("CORE_END case");
 164             break;
 165
 166         case CORE_VERSION:
 167             SHOW("CORE_VERSION case");
 168             if (*ptr != SBCL_CORE_VERSION_INTEGER) {
 169                 lose("core file version (%d) != runtime library version (%d)",
 170                      *ptr,
 171                      SBCL_CORE_VERSION_INTEGER);
 172             }
 173             break;
 174
 175         case CORE_NDIRECTORY:
 176             SHOW("CORE_NDIRECTORY case");
 177             process_directory(fd,
 178                               ptr,
 179 #ifndef alpha
 180                               remaining_len / (sizeof(struct ndir_entry) /
 181                                                sizeof(long))
 182 #else
 183                               remaining_len / (sizeof(struct ndir_entry) /
 184                                                sizeof(u32))
 185 #endif
 186                               );
 187             break;
 188
 189         case CORE_INITIAL_FUNCTION:
 190             SHOW("CORE_INITIAL_FUNCTION case");
 191             initial_function = (lispobj)*ptr;
 192             break;
 193
 194         default:
 195             lose("unknown core file entry: %ld", (long)val);
 196         }
 197
 198         ptr += remaining_len;
 199         FSHOW((stderr, "/new ptr=%x\n", ptr));
 200     }
 201     SHOW("about to free(header)");
 202     free(header);
 203     SHOW("returning from load_core_file(..)");
 204     return initial_function;
 205 }