| 1 | /* Support for dumping and reloading various pieces of GDB's internal state. |
| 2 | Copyright 1992 Free Software Foundation, Inc. |
| 3 | Contributed by Cygnus Support, using pieces from other GDB modules. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | /* This file provides support for dumping and then later reloading various |
| 22 | portions of gdb's internal state. It was originally implemented to |
| 23 | support a need for mapping in an image of gdb's symbol table from an |
| 24 | external file, where this image was created by an external program, such |
| 25 | as an incremental linker. However, it was generalized to enable future |
| 26 | support for dumping and reloading various other useful pieces of gdb's |
| 27 | internal state. |
| 28 | |
| 29 | State files have a fairly simple form which is intended to be easily |
| 30 | extensible. The basic format is: |
| 31 | |
| 32 | <file-header> <state-data> <form-tree> |
| 33 | |
| 34 | Where: |
| 35 | |
| 36 | file-header A simple file-header containing a magic number |
| 37 | so that gdb (and other readers) can quickly |
| 38 | determine what kind of file this is, and a file |
| 39 | offset to the root of the form-tree. |
| 40 | |
| 41 | state-data The "raw" state-data that is referenced by nodes |
| 42 | in the form-tree. |
| 43 | |
| 44 | form-tree A tree of arbitrarily sized nodes containing |
| 45 | information about gdb's internal state, and |
| 46 | possibly referencing data in the state-data section |
| 47 | of the file. Resembles DWARF in some respects. |
| 48 | |
| 49 | When writing a state file, a hole is left for the file-header at the |
| 50 | beginning of the file, the state data is written immediately after the |
| 51 | file header (while storing the file offsets and sizes back into the |
| 52 | internal form-tree along the way), the form-tree itself is written |
| 53 | at the end of the file, and then the file header is written by seeking |
| 54 | back to the beginning of the file. This order is required because |
| 55 | the form tree contains file offsets and sizes in the state data portion |
| 56 | of the file, and the file header contains the file offset to the start |
| 57 | of the form tree. |
| 58 | |
| 59 | Readers simply open the file, validate the magic number, seek to the |
| 60 | root of the form-tree, and walk the tree looking for the information that |
| 61 | they are interested in (and ignoring things that they aren't, or don't |
| 62 | understand). |
| 63 | |
| 64 | */ |
| 65 | |
| 66 | |
| 67 | #include "defs.h" |
| 68 | #include "symtab.h" |
| 69 | #include "bfd.h" |
| 70 | #include "symfile.h" |
| 71 | #include "state.h" |
| 72 | |
| 73 | #ifndef SEEK_SET |
| 74 | #define SEEK_SET 0 |
| 75 | #endif |
| 76 | |
| 77 | #ifndef SEEK_END |
| 78 | #define SEEK_END 2 |
| 79 | #endif |
| 80 | |
| 81 | /* Inside the state file, the form-tree consists of a series of |
| 82 | form-tree entries (FTE's). The parent/child/sibling relationships |
| 83 | are implied by the ordering and by an explicit sibling reference |
| 84 | in FTE's that have siblings. |
| 85 | |
| 86 | Specifically, given two sequential FTE's, say A and B, if B immediately |
| 87 | follows A, and A does not have a sibling reference to B, then B is |
| 88 | the first child of A. Otherwise B must be a sibling of A and A must |
| 89 | have a sibling reference for it. |
| 90 | |
| 91 | Each FTE is simply an array of long integers, with at least three |
| 92 | members. This form was chosen over a packed data form for simplicity |
| 93 | in access, not having to worry about the relative sizes of the different |
| 94 | integers (short, int, long), and not having to worry about alignment |
| 95 | constraints. Also in the name of simplicity, every FTE has a sibling |
| 96 | reference slot reserved for it, even if there are no siblings. |
| 97 | |
| 98 | The first value in an FTE is the size of the FTE in bytes, including |
| 99 | the size value itself. The second entry contains a tag which indicates |
| 100 | the type of the FTE. The third entry is a sibling reference, which either |
| 101 | refers to a valid sibling node or is zero. Following is zero or more |
| 102 | attributes, each of which consists of one or more long values. */ |
| 103 | |
| 104 | /* Tag names and codes. */ |
| 105 | |
| 106 | #define TAG_padding 0x0000 /* Padding */ |
| 107 | #define TAG_objfile 0x0001 /* Dumped objfile */ |
| 108 | |
| 109 | /* Form names, codes, and macros. */ |
| 110 | |
| 111 | #define FORM_ABSREF 0x01 /* Next long is absolute file offset */ |
| 112 | #define FORM_RELREF 0x02 /* Next long is relative file offset */ |
| 113 | #define FORM_IVAL 0x03 /* Next long is int value */ |
| 114 | #define FORM_ADDR 0x04 /* Next long is mem addr */ |
| 115 | |
| 116 | #define FORM_MASK 0xFF |
| 117 | #define FORM_X(atr) ((atr) & FORM_MASK) |
| 118 | |
| 119 | /* Attribute names and codes. */ |
| 120 | |
| 121 | #define AT_sibling (0x0100 | FORM_RELREF) /* Reference to sibling node */ |
| 122 | #define AT_name (0x0200 | FORM_ABSREF) /* Reference to a string */ |
| 123 | #define AT_offset (0x0300 | FORM_ABSREF) /* Reference to generic data */ |
| 124 | #define AT_size (0x0400 | FORM_IVAL) |
| 125 | #define AT_addr (0x0500 | FORM_ADDR) |
| 126 | #define AT_aux_addr (0x0600 | FORM_ADDR) |
| 127 | |
| 128 | /* */ |
| 129 | |
| 130 | static void |
| 131 | load_symbols PARAMS ((FILE *)); |
| 132 | |
| 133 | static void |
| 134 | dump_state_command PARAMS ((char *, int)); |
| 135 | |
| 136 | static void |
| 137 | load_state_command PARAMS ((char *, int)); |
| 138 | |
| 139 | #ifdef HAVE_MMAP |
| 140 | |
| 141 | static void |
| 142 | write_header PARAMS ((sfd *)); |
| 143 | |
| 144 | static void |
| 145 | write_formtree PARAMS ((sfd *)); |
| 146 | |
| 147 | static void |
| 148 | write_objfile_state PARAMS ((sfd *)); |
| 149 | |
| 150 | static void |
| 151 | free_subtree PARAMS ((struct formnode *)); |
| 152 | |
| 153 | static void |
| 154 | size_subtree PARAMS ((struct formnode *)); |
| 155 | |
| 156 | #endif |
| 157 | |
| 158 | struct formnode *formtree = NULL; |
| 159 | |
| 160 | /* ARGSUSED */ |
| 161 | static void |
| 162 | load_symbols (statefile) |
| 163 | FILE *statefile; |
| 164 | { |
| 165 | |
| 166 | #if 0 |
| 167 | /* Discard old symbols. FIXME: This is essentially symbol_file_command's |
| 168 | body when there is no name. Make it a common function that is |
| 169 | called from each place. */ |
| 170 | |
| 171 | if (symfile_objfile) |
| 172 | { |
| 173 | free_objfile (symfile_objfile); |
| 174 | } |
| 175 | symfile_objfile = NULL; |
| 176 | #endif |
| 177 | |
| 178 | #if 0 && defined (HAVE_MMAP) |
| 179 | if (mtop > mbase) |
| 180 | { |
| 181 | warning ("internal error: mbase (%08x) != mtop (%08x)", |
| 182 | mbase, mtop); |
| 183 | munmap (mbase, mtop - mbase); |
| 184 | } |
| 185 | #endif /* HAVE_MMAP */ |
| 186 | |
| 187 | /* Getting new symbols may change our opinion about what is frameless. */ |
| 188 | |
| 189 | reinit_frame_cache (); |
| 190 | |
| 191 | } |
| 192 | |
| 193 | #ifdef HAVE_MMAP |
| 194 | |
| 195 | /* Allocate a form node */ |
| 196 | |
| 197 | static struct formnode * |
| 198 | alloc_formnode () |
| 199 | { |
| 200 | struct formnode *fnp; |
| 201 | fnp = (struct formnode *) xmalloc (sizeof (struct formnode)); |
| 202 | (void) memset (fnp, 0, sizeof (struct formnode)); |
| 203 | fnp -> sibling = formtree; |
| 204 | formtree = fnp; |
| 205 | return (fnp); |
| 206 | } |
| 207 | |
| 208 | /* Recursively walk a form-tree from the specified node, freeing |
| 209 | nodes from the bottom up. The concept is pretty simple, just free |
| 210 | all the child nodes, then all the sibling nodes, then the node |
| 211 | itself. */ |
| 212 | |
| 213 | static void |
| 214 | free_subtree (fnp) |
| 215 | struct formnode *fnp; |
| 216 | { |
| 217 | if (fnp != NULL) |
| 218 | { |
| 219 | free_subtree (fnp -> child); |
| 220 | free_subtree (fnp -> sibling); |
| 221 | if (fnp -> nodedata != NULL) |
| 222 | { |
| 223 | free (fnp -> nodedata); |
| 224 | } |
| 225 | free (fnp); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | /* Recursively walk a form-tree from the specified node, computing the |
| 230 | size of each subtree from the bottom up. |
| 231 | |
| 232 | At each node, the file space that will be consumed by the subtree |
| 233 | rooted in that node is the sum of all the subtrees rooted in each |
| 234 | child node plus the size of the node itself. |
| 235 | |
| 236 | Thus for each node, we size the child subtrees, add to that our |
| 237 | size, contribute this size towards the size of any parent node, and |
| 238 | then ask any of our siblings to do the same. |
| 239 | |
| 240 | Also, once we know the size of any subtree rooted at this node, we |
| 241 | can initialize the offset to the sibling node (if any). |
| 242 | |
| 243 | Since every form-tree node must have valid nodedata at this point, |
| 244 | we detect and report a warning for any node that doesn't. */ |
| 245 | |
| 246 | static void |
| 247 | size_subtree (fnp) |
| 248 | struct formnode *fnp; |
| 249 | { |
| 250 | long *lp; |
| 251 | |
| 252 | if (fnp != NULL) |
| 253 | { |
| 254 | if (fnp -> nodedata == NULL) |
| 255 | { |
| 256 | warning ("internal error -- empty form node"); |
| 257 | } |
| 258 | else |
| 259 | { |
| 260 | size_subtree (fnp -> child); |
| 261 | fnp -> treesize += *(long *) fnp -> nodedata; |
| 262 | if (fnp -> parent != NULL) |
| 263 | { |
| 264 | fnp -> parent -> treesize += fnp -> treesize; |
| 265 | } |
| 266 | if (fnp -> sibling) |
| 267 | { |
| 268 | size_subtree (fnp -> sibling); |
| 269 | lp = (long *) (fnp -> nodedata + 2 * sizeof (long)); |
| 270 | *lp = fnp -> treesize; |
| 271 | } |
| 272 | } |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | /* Recursively walk a form-tree from the specified node, writing |
| 277 | nodes from the top down. */ |
| 278 | |
| 279 | static void |
| 280 | write_subtree (fnp, asfd) |
| 281 | struct formnode *fnp; |
| 282 | sfd *asfd; |
| 283 | { |
| 284 | if (fnp != NULL) |
| 285 | { |
| 286 | if (fnp -> nodedata != NULL) |
| 287 | { |
| 288 | fwrite (fnp -> nodedata, *(long *) fnp -> nodedata, 1, asfd -> fp); |
| 289 | } |
| 290 | write_subtree (fnp -> child, asfd); |
| 291 | write_subtree (fnp -> sibling, asfd); |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | /* Free the entire current formtree. Called via do_cleanups, regardless |
| 296 | of whether there is an error or not. */ |
| 297 | |
| 298 | static void |
| 299 | free_formtree () |
| 300 | { |
| 301 | free_subtree (formtree); |
| 302 | formtree = NULL; |
| 303 | } |
| 304 | |
| 305 | /* Write out the file header. Generally this is done last, even though |
| 306 | it is located at the start of the file, since we need to have file |
| 307 | offset to where the annotated form tree was written, and it's size. */ |
| 308 | |
| 309 | static void |
| 310 | write_header (asfd) |
| 311 | sfd *asfd; |
| 312 | { |
| 313 | fseek (asfd -> fp, 0L, SEEK_SET); |
| 314 | fwrite ((char *) &asfd -> hdr, sizeof (asfd -> hdr), 1, asfd -> fp); |
| 315 | } |
| 316 | |
| 317 | /* Write out the annotated form tree. We should already have written out |
| 318 | the state data, and noted the file offsets and sizes in each node of |
| 319 | the form tree that references part of the state data. |
| 320 | |
| 321 | The form tree can be written anywhere in the file where there is room |
| 322 | for it. Since there is always room at the end of the file, we write |
| 323 | it there. We also need to record the file offset to the start of the |
| 324 | form tree, and it's size, for future use when writing the file header. |
| 325 | |
| 326 | In order to compute the sibling references, we need to know, at |
| 327 | each node, how much space will be consumed when all of that node's |
| 328 | children nodes have been written. Thus we walk the tree, computing |
| 329 | the sizes of the subtrees from the bottom up. At any node, the |
| 330 | offset from the start of that node to the start of the sibling node |
| 331 | is simply the size of the node plus the size of the subtree rooted |
| 332 | in that node. */ |
| 333 | |
| 334 | static void |
| 335 | write_formtree (asfd) |
| 336 | sfd *asfd; |
| 337 | { |
| 338 | size_subtree (formtree); |
| 339 | fseek (asfd -> fp, 0L, SEEK_END); |
| 340 | asfd -> hdr.sf_ftoff = ftell (asfd -> fp); |
| 341 | write_subtree (formtree, asfd); |
| 342 | asfd -> hdr.sf_ftsize = ftell (asfd -> fp) - asfd -> hdr.sf_ftoff; |
| 343 | } |
| 344 | |
| 345 | /* Note that we currently only support having one objfile with dumpable |
| 346 | state. */ |
| 347 | |
| 348 | static void |
| 349 | write_objfile_state (asfd) |
| 350 | sfd *asfd; |
| 351 | { |
| 352 | struct objfile *objfile; |
| 353 | struct formnode *fnp; |
| 354 | PTR base; |
| 355 | PTR breakval; |
| 356 | long *lp; |
| 357 | unsigned int ftesize; |
| 358 | long ftebuf[64]; |
| 359 | long foffset; |
| 360 | |
| 361 | /* First walk through the objfile list looking for the first objfile |
| 362 | that is dumpable. */ |
| 363 | |
| 364 | for (objfile = object_files; objfile != NULL; objfile = objfile -> next) |
| 365 | { |
| 366 | if (objfile -> flags & OBJF_DUMPABLE) |
| 367 | { |
| 368 | break; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | if (objfile == NULL) |
| 373 | { |
| 374 | warning ("no dumpable objfile was found"); |
| 375 | } |
| 376 | else |
| 377 | { |
| 378 | fnp = alloc_formnode (); |
| 379 | lp = ftebuf; |
| 380 | |
| 381 | lp++; /* Skip FTE size slot, filled in at the end. */ |
| 382 | *lp++ = TAG_objfile; /* This is an objfile FTE */ |
| 383 | *lp++ = 0; /* Zero the sibling reference slot. */ |
| 384 | |
| 385 | /* Build an AT_name attribute for the objfile's name, and write |
| 386 | the name into the state data. */ |
| 387 | |
| 388 | *lp++ = AT_name; |
| 389 | *lp++ = (long) ftell (asfd -> fp); |
| 390 | fwrite (objfile -> name, strlen (objfile -> name) + 1, 1, asfd -> fp); |
| 391 | |
| 392 | /* Build an AT_addr attribute for the virtual address to which the |
| 393 | objfile data is mapped (and needs to be remapped when read in). */ |
| 394 | |
| 395 | base = mmap_base (); |
| 396 | *lp++ = AT_addr; |
| 397 | *lp++ = (long) base; |
| 398 | |
| 399 | /* Build an AT_aux_addr attribute for the address of the objfile |
| 400 | structure itself, within the dumpable data. When we read the objfile |
| 401 | back in, we use this address as the pointer the "struct objfile". */ |
| 402 | |
| 403 | *lp++ = AT_aux_addr; |
| 404 | *lp++ = (long) objfile; |
| 405 | |
| 406 | /* Reposition in state file to next paging boundry so we can mmap the |
| 407 | dumpable objfile data when we reload it. */ |
| 408 | |
| 409 | foffset = (long) mmap_page_align ((PTR) ftell (asfd -> fp)); |
| 410 | fseek (asfd -> fp, foffset, SEEK_SET); |
| 411 | |
| 412 | /* Build an AT_offset attribute for the offset in the state file to |
| 413 | the start of the dumped objfile data. */ |
| 414 | |
| 415 | *lp++ = AT_offset; |
| 416 | *lp++ = (long) ftell (asfd -> fp); |
| 417 | |
| 418 | /* Build an AT_size attribute for the size of the dumped objfile data. */ |
| 419 | |
| 420 | breakval = mmap_sbrk (0); |
| 421 | *lp++ = AT_size; |
| 422 | *lp++ = breakval - base; |
| 423 | |
| 424 | /* Write the dumpable data. */ |
| 425 | |
| 426 | fwrite ((char *) base, breakval - base, 1, asfd -> fp); |
| 427 | |
| 428 | /* Now finish up the FTE by filling in the size slot based on |
| 429 | how much of the ftebuf we have used, allocate some memory for |
| 430 | it hung off the form tree node, and copy it there. */ |
| 431 | |
| 432 | ftebuf[0] = (lp - ftebuf) * sizeof (ftebuf[0]); |
| 433 | fnp -> nodedata = (char *) xmalloc (ftebuf[0]); |
| 434 | memcpy (fnp -> nodedata, ftebuf, ftebuf[0]); |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | static void |
| 439 | load_state_command (arg_string, from_tty) |
| 440 | char *arg_string; |
| 441 | int from_tty; |
| 442 | { |
| 443 | char *filename; |
| 444 | char **argv; |
| 445 | FILE *fp; |
| 446 | struct cleanup *cleanups; |
| 447 | |
| 448 | dont_repeat (); |
| 449 | |
| 450 | if (arg_string == NULL) |
| 451 | { |
| 452 | error ("load-state takes a file name and optional state specifiers"); |
| 453 | } |
| 454 | else if ((argv = buildargv (arg_string)) == NULL) |
| 455 | { |
| 456 | fatal ("virtual memory exhausted.", 0); |
| 457 | } |
| 458 | cleanups = make_cleanup (freeargv, argv); |
| 459 | |
| 460 | filename = tilde_expand (*argv); |
| 461 | make_cleanup (free, filename); |
| 462 | |
| 463 | if ((fp = fopen (filename, FOPEN_RB)) == NULL) |
| 464 | { |
| 465 | perror_with_name (filename); |
| 466 | } |
| 467 | make_cleanup (fclose, fp); |
| 468 | immediate_quit++; |
| 469 | |
| 470 | while (*++argv != NULL) |
| 471 | { |
| 472 | if (STREQ (*argv, "symbols")) |
| 473 | { |
| 474 | if (from_tty |
| 475 | && !query ("load symbol table state from file \"%s\"? ", |
| 476 | filename)) |
| 477 | { |
| 478 | error ("Not confirmed."); |
| 479 | } |
| 480 | load_symbols (fp); |
| 481 | } |
| 482 | else |
| 483 | { |
| 484 | error ("unknown state specifier '%s'", *argv); |
| 485 | } |
| 486 | } |
| 487 | immediate_quit--; |
| 488 | do_cleanups (cleanups); |
| 489 | } |
| 490 | |
| 491 | /* ARGSUSED */ |
| 492 | static void |
| 493 | dump_state_command (arg_string, from_tty) |
| 494 | char *arg_string; |
| 495 | int from_tty; |
| 496 | { |
| 497 | char *filename; |
| 498 | char **argv; |
| 499 | sfd *asfd; |
| 500 | struct cleanup *cleanups; |
| 501 | |
| 502 | dont_repeat (); |
| 503 | |
| 504 | if (arg_string == NULL) |
| 505 | { |
| 506 | error ("dump-state takes a file name and state specifiers"); |
| 507 | } |
| 508 | else if ((argv = buildargv (arg_string)) == NULL) |
| 509 | { |
| 510 | fatal ("virtual memory exhausted.", 0); |
| 511 | } |
| 512 | cleanups = make_cleanup (freeargv, argv); |
| 513 | |
| 514 | filename = tilde_expand (*argv); |
| 515 | make_cleanup (free, filename); |
| 516 | |
| 517 | /* Now attempt to create a fresh state file. */ |
| 518 | |
| 519 | if ((asfd = sfd_fopen (filename, FOPEN_WB)) == NULL) |
| 520 | { |
| 521 | perror_with_name (filename); |
| 522 | } |
| 523 | make_cleanup (sfd_fclose, asfd); |
| 524 | make_cleanup (free_formtree, NULL); |
| 525 | immediate_quit++; |
| 526 | |
| 527 | /* Now that we have an open and initialized state file, seek to the |
| 528 | proper offset to start writing state data and the process the |
| 529 | arguments. For each argument, write the state data and initialize |
| 530 | a form-tree node for each piece of state data. */ |
| 531 | |
| 532 | fseek (asfd -> fp, sizeof (sf_hdr), SEEK_SET); |
| 533 | while (*++argv != NULL) |
| 534 | { |
| 535 | if (STREQ (*argv, "objfile")) |
| 536 | { |
| 537 | write_objfile_state (asfd); |
| 538 | } |
| 539 | else |
| 540 | { |
| 541 | error ("unknown state specifier '%s'", *argv); |
| 542 | } |
| 543 | |
| 544 | } |
| 545 | |
| 546 | /* We have written any state data. All that is left to do now is |
| 547 | write the form-tree and the file header. */ |
| 548 | |
| 549 | write_formtree (asfd); |
| 550 | write_header (asfd); |
| 551 | |
| 552 | immediate_quit--; |
| 553 | do_cleanups (cleanups); |
| 554 | } |
| 555 | |
| 556 | static char * |
| 557 | find_fte_by_walk (thisfte, endfte, tag) |
| 558 | char *thisfte; |
| 559 | char *endfte; |
| 560 | long tag; |
| 561 | { |
| 562 | char *found = NULL; |
| 563 | char *nextfte; |
| 564 | long thistag; |
| 565 | long thissize; |
| 566 | long siboffset; |
| 567 | |
| 568 | while (thisfte < endfte) |
| 569 | { |
| 570 | if ((thistag = *(long *)(thisfte + sizeof (long))) == tag) |
| 571 | { |
| 572 | found = thisfte; |
| 573 | break; |
| 574 | } |
| 575 | else |
| 576 | { |
| 577 | thissize = *(long *)(thisfte); |
| 578 | siboffset = *(long *)(thisfte + (2 * sizeof (long))); |
| 579 | nextfte = thisfte + (siboffset != 0 ? siboffset : thissize); |
| 580 | found = find_fte_by_walk (thisfte + thissize, nextfte, tag); |
| 581 | thisfte = nextfte; |
| 582 | } |
| 583 | } |
| 584 | return (found); |
| 585 | } |
| 586 | |
| 587 | /* Walk the form-tree looking for a specific FTE type. Returns the first |
| 588 | one found that matches the specified tag. */ |
| 589 | |
| 590 | static char * |
| 591 | find_fte (asfd, tag) |
| 592 | sfd *asfd; |
| 593 | long tag; |
| 594 | { |
| 595 | char *ftbase; |
| 596 | char *ftend; |
| 597 | char *ftep; |
| 598 | char *found = NULL; |
| 599 | |
| 600 | if (fseek (asfd -> fp, asfd -> hdr.sf_ftoff, SEEK_SET) == 0) |
| 601 | { |
| 602 | ftbase = xmalloc (asfd -> hdr.sf_ftsize); |
| 603 | ftend = ftbase + asfd -> hdr.sf_ftsize; |
| 604 | if (fread (ftbase, asfd -> hdr.sf_ftsize, 1, asfd -> fp) == 1) |
| 605 | { |
| 606 | ftep = find_fte_by_walk (ftbase, ftend, tag); |
| 607 | if (ftep != NULL) |
| 608 | { |
| 609 | found = xmalloc (*(long *)ftep); |
| 610 | memcpy (found, ftep, (int) *(long *)ftep); |
| 611 | } |
| 612 | } |
| 613 | free (ftbase); |
| 614 | } |
| 615 | return (found); |
| 616 | } |
| 617 | |
| 618 | struct objfile * |
| 619 | objfile_from_statefile (asfd) |
| 620 | sfd *asfd; |
| 621 | { |
| 622 | struct objfile *objfile = NULL; |
| 623 | char *ftep; |
| 624 | long *thisattr; |
| 625 | long *endattr; |
| 626 | PTR base; |
| 627 | long foffset; |
| 628 | long mapsize; |
| 629 | |
| 630 | ftep = find_fte (asfd, TAG_objfile); |
| 631 | thisattr = (long *) (ftep + 3 * sizeof (long)); |
| 632 | endattr = (long *) (ftep + *(long *)ftep); |
| 633 | while (thisattr < endattr) |
| 634 | { |
| 635 | switch (*thisattr++) |
| 636 | { |
| 637 | case AT_name: |
| 638 | /* Ignore for now */ |
| 639 | thisattr++; |
| 640 | break; |
| 641 | case AT_addr: |
| 642 | base = (PTR) *thisattr++; |
| 643 | break; |
| 644 | case AT_aux_addr: |
| 645 | objfile = (struct objfile *) *thisattr++; |
| 646 | break; |
| 647 | case AT_offset: |
| 648 | foffset = *thisattr++; |
| 649 | break; |
| 650 | case AT_size: |
| 651 | mapsize = *thisattr++; |
| 652 | break; |
| 653 | } |
| 654 | } |
| 655 | if (mmap_remap (base, mapsize, (int) fileno (asfd -> fp), foffset) != base) |
| 656 | { |
| 657 | print_sys_errmsg (asfd -> filename, errno); |
| 658 | error ("mapping failed"); |
| 659 | } |
| 660 | |
| 661 | return (objfile); |
| 662 | } |
| 663 | |
| 664 | #else |
| 665 | |
| 666 | struct objfile * |
| 667 | objfile_from_statefile (asfd) |
| 668 | sfd *asfd; |
| 669 | { |
| 670 | error ("this version of gdb doesn't support reloading symtabs from state files"); |
| 671 | } |
| 672 | |
| 673 | #endif /* HAVE_MMAP */ |
| 674 | |
| 675 | /* Close a state file, freeing all memory that was used by the state |
| 676 | file descriptor, closing the raw file pointer, etc. */ |
| 677 | |
| 678 | void |
| 679 | sfd_fclose (asfd) |
| 680 | sfd *asfd; |
| 681 | { |
| 682 | if (asfd != NULL) |
| 683 | { |
| 684 | if (asfd -> fp != NULL) |
| 685 | { |
| 686 | fclose (asfd -> fp); |
| 687 | } |
| 688 | if (asfd -> filename != NULL) |
| 689 | { |
| 690 | free (asfd -> filename); |
| 691 | } |
| 692 | free (asfd); |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | /* Given the name of a possible statefile, and flags to use to open it, |
| 697 | try to open the file and prepare it for use. |
| 698 | |
| 699 | If the flags contain 'r', then we want to read an existing state |
| 700 | file, so attempt to read in the state file header and determine if this |
| 701 | is a valid state file. If not, return NULL. |
| 702 | |
| 703 | Returns a pointer to a properly initialized state file descriptor if |
| 704 | successful. */ |
| 705 | |
| 706 | sfd * |
| 707 | sfd_fopen (name, flags) |
| 708 | char *name; |
| 709 | char *flags; |
| 710 | { |
| 711 | int success = 0; |
| 712 | sfd *asfd; |
| 713 | |
| 714 | asfd = (sfd *) xmalloc (sizeof (sfd)); |
| 715 | (void) memset (asfd, 0, sizeof (sfd)); |
| 716 | asfd -> filename = xmalloc (strlen (name) + 1); |
| 717 | (void) strcpy (asfd -> filename, name); |
| 718 | |
| 719 | if ((asfd -> fp = fopen (asfd -> filename, flags)) != NULL) |
| 720 | { |
| 721 | /* We have the file, now see if we are reading an existing file |
| 722 | or writing to a new file. We don't currently support "rw". */ |
| 723 | if (strchr (flags, 'r') != NULL) |
| 724 | { |
| 725 | if (fread ((char *) &asfd -> hdr, sizeof (asfd -> hdr), 1, |
| 726 | asfd -> fp) == 1) |
| 727 | { |
| 728 | if (SF_GOOD_MAGIC (asfd)) |
| 729 | { |
| 730 | success = 1; |
| 731 | } |
| 732 | } |
| 733 | } |
| 734 | else |
| 735 | { |
| 736 | /* This is a new state file. Initialize various things. */ |
| 737 | asfd -> hdr.sf_mag0 = SF_MAG0; |
| 738 | asfd -> hdr.sf_mag1 = SF_MAG1; |
| 739 | asfd -> hdr.sf_mag2 = SF_MAG2; |
| 740 | asfd -> hdr.sf_mag3 = SF_MAG3; |
| 741 | success = 1; |
| 742 | } |
| 743 | } |
| 744 | |
| 745 | if (!success) |
| 746 | { |
| 747 | sfd_fclose (asfd); |
| 748 | asfd = NULL; |
| 749 | } |
| 750 | return (asfd); |
| 751 | |
| 752 | } |
| 753 | |
| 754 | \f |
| 755 | void |
| 756 | _initialize_state () |
| 757 | { |
| 758 | |
| 759 | #ifdef HAVE_MMAP |
| 760 | |
| 761 | add_com ("load-state", class_support, load_state_command, |
| 762 | "Load some saved gdb state from FILE.\n\ |
| 763 | Select and load some portion of gdb's saved state from the specified file.\n\ |
| 764 | The dump-state command may be used to save various portions of gdb's\n\ |
| 765 | internal state."); |
| 766 | |
| 767 | add_com ("dump-state", class_support, dump_state_command, |
| 768 | "Dump some of gdb's state to FILE.\n\ |
| 769 | Select and dump some portion of gdb's internal state to the specified file.\n\ |
| 770 | The load-state command may be used to reload various portions of gdb's\n\ |
| 771 | internal state from the file."); |
| 772 | |
| 773 | #endif /* HAVE_MMAP */ |
| 774 | |
| 775 | } |