| 1 | /* Modified by Andrew.Vignaux@comp.vuw.ac.nz to get it to work :-) */ |
| 2 | |
| 3 | /* Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 1, or (at your option) |
| 8 | any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 18 | |
| 19 | In other words, you are welcome to use, share and improve this program. |
| 20 | You are forbidden to forbid anyone else to use, share and improve |
| 21 | what you give them. Help stamp out software-hoarding! */ |
| 22 | |
| 23 | |
| 24 | /* |
| 25 | * unexec.c - Convert a running program into an a.out file. |
| 26 | * |
| 27 | * Author: Spencer W. Thomas |
| 28 | * Computer Science Dept. |
| 29 | * University of Utah |
| 30 | * Date: Tue Mar 2 1982 |
| 31 | * Modified heavily since then. |
| 32 | * |
| 33 | * Synopsis: |
| 34 | * unexec (new_name, a_name, data_start, bss_start, entry_address) |
| 35 | * char *new_name, *a_name; |
| 36 | * unsigned data_start, bss_start, entry_address; |
| 37 | * |
| 38 | * Takes a snapshot of the program and makes an a.out format file in the |
| 39 | * file named by the string argument new_name. |
| 40 | * If a_name is non-NULL, the symbol table will be taken from the given file. |
| 41 | * On some machines, an existing a_name file is required. |
| 42 | * |
| 43 | * The boundaries within the a.out file may be adjusted with the data_start |
| 44 | * and bss_start arguments. Either or both may be given as 0 for defaults. |
| 45 | * |
| 46 | * Data_start gives the boundary between the text segment and the data |
| 47 | * segment of the program. The text segment can contain shared, read-only |
| 48 | * program code and literal data, while the data segment is always unshared |
| 49 | * and unprotected. Data_start gives the lowest unprotected address. |
| 50 | * The value you specify may be rounded down to a suitable boundary |
| 51 | * as required by the machine you are using. |
| 52 | * |
| 53 | * Specifying zero for data_start means the boundary between text and data |
| 54 | * should not be the same as when the program was loaded. |
| 55 | * If NO_REMAP is defined, the argument data_start is ignored and the |
| 56 | * segment boundaries are never changed. |
| 57 | * |
| 58 | * Bss_start indicates how much of the data segment is to be saved in the |
| 59 | * a.out file and restored when the program is executed. It gives the lowest |
| 60 | * unsaved address, and is rounded up to a page boundary. The default when 0 |
| 61 | * is given assumes that the entire data segment is to be stored, including |
| 62 | * the previous data and bss as well as any additional storage allocated with |
| 63 | * break (2). |
| 64 | * |
| 65 | * The new file is set up to start at entry_address. |
| 66 | * |
| 67 | * If you make improvements I'd like to get them too. |
| 68 | * harpo!utah-cs!thomas, thomas@Utah-20 |
| 69 | * |
| 70 | */ |
| 71 | |
| 72 | /* There are several compilation parameters affecting unexec: |
| 73 | |
| 74 | * COFF |
| 75 | |
| 76 | Define this if your system uses COFF for executables. |
| 77 | Otherwise we assume you use Berkeley format. |
| 78 | |
| 79 | * NO_REMAP |
| 80 | |
| 81 | Define this if you do not want to try to save Emacs's pure data areas |
| 82 | as part of the text segment. |
| 83 | |
| 84 | Saving them as text is good because it allows users to share more. |
| 85 | |
| 86 | However, on machines that locate the text area far from the data area, |
| 87 | the boundary cannot feasibly be moved. Such machines require |
| 88 | NO_REMAP. |
| 89 | |
| 90 | Also, remapping can cause trouble with the built-in startup routine |
| 91 | /lib/crt0.o, which defines `environ' as an initialized variable. |
| 92 | Dumping `environ' as pure does not work! So, to use remapping, |
| 93 | you must write a startup routine for your machine in Emacs's crt0.c. |
| 94 | If NO_REMAP is defined, Emacs uses the system's crt0.o. |
| 95 | |
| 96 | * SECTION_ALIGNMENT |
| 97 | |
| 98 | Some machines that use COFF executables require that each section |
| 99 | start on a certain boundary *in the COFF file*. Such machines should |
| 100 | define SECTION_ALIGNMENT to a mask of the low-order bits that must be |
| 101 | zero on such a boundary. This mask is used to control padding between |
| 102 | segments in the COFF file. |
| 103 | |
| 104 | If SECTION_ALIGNMENT is not defined, the segments are written |
| 105 | consecutively with no attempt at alignment. This is right for |
| 106 | unmodified system V. |
| 107 | |
| 108 | * SEGMENT_MASK |
| 109 | |
| 110 | Some machines require that the beginnings and ends of segments |
| 111 | *in core* be on certain boundaries. For most machines, a page |
| 112 | boundary is sufficient. That is the default. When a larger |
| 113 | boundary is needed, define SEGMENT_MASK to a mask of |
| 114 | the bits that must be zero on such a boundary. |
| 115 | |
| 116 | * A_TEXT_OFFSET(HDR) |
| 117 | |
| 118 | Some machines count the a.out header as part of the size of the text |
| 119 | segment (a_text); they may actually load the header into core as the |
| 120 | first data in the text segment. Some have additional padding between |
| 121 | the header and the real text of the program that is counted in a_text. |
| 122 | |
| 123 | For these machines, define A_TEXT_OFFSET(HDR) to examine the header |
| 124 | structure HDR and return the number of bytes to add to `a_text' |
| 125 | before writing it (above and beyond the number of bytes of actual |
| 126 | program text). HDR's standard fields are already correct, except that |
| 127 | this adjustment to the `a_text' field has not yet been made; |
| 128 | thus, the amount of offset can depend on the data in the file. |
| 129 | |
| 130 | * A_TEXT_SEEK(HDR) |
| 131 | |
| 132 | If defined, this macro specifies the number of bytes to seek into the |
| 133 | a.out file before starting to write the text segment.a |
| 134 | |
| 135 | * EXEC_MAGIC |
| 136 | |
| 137 | For machines using COFF, this macro, if defined, is a value stored |
| 138 | into the magic number field of the output file. |
| 139 | |
| 140 | * ADJUST_EXEC_HEADER |
| 141 | |
| 142 | This macro can be used to generate statements to adjust or |
| 143 | initialize nonstandard fields in the file header |
| 144 | |
| 145 | * ADDR_CORRECT(ADDR) |
| 146 | |
| 147 | Macro to correct an int which is the bit pattern of a pointer to a byte |
| 148 | into an int which is the number of a byte. |
| 149 | |
| 150 | This macro has a default definition which is usually right. |
| 151 | This default definition is a no-op on most machines (where a |
| 152 | pointer looks like an int) but not on all machines. |
| 153 | |
| 154 | */ |
| 155 | |
| 156 | #define XCOFF |
| 157 | #define COFF |
| 158 | #define NO_REMAP |
| 159 | |
| 160 | #ifndef emacs |
| 161 | #define PERROR(arg) perror (arg); return -1 |
| 162 | #else |
| 163 | #include "config.h" |
| 164 | #define PERROR(file) report_error (file, new) |
| 165 | #endif |
| 166 | |
| 167 | #ifndef CANNOT_DUMP /* all rest of file! */ |
| 168 | |
| 169 | #ifndef CANNOT_UNEXEC /* most of rest of file */ |
| 170 | |
| 171 | #include <a.out.h> |
| 172 | /* Define getpagesize () if the system does not. |
| 173 | Note that this may depend on symbols defined in a.out.h |
| 174 | */ |
| 175 | #include "getpagesize.h" |
| 176 | |
| 177 | #ifndef makedev /* Try to detect types.h already loaded */ |
| 178 | #include <sys/types.h> |
| 179 | #endif |
| 180 | #include <stdio.h> |
| 181 | #include <sys/stat.h> |
| 182 | #include <errno.h> |
| 183 | |
| 184 | extern char *start_of_text (); /* Start of text */ |
| 185 | extern char *start_of_data (); /* Start of initialized data */ |
| 186 | |
| 187 | extern int _data; |
| 188 | extern int _edata; |
| 189 | extern int _text; |
| 190 | extern int _etext; |
| 191 | extern int _end; |
| 192 | #ifdef COFF |
| 193 | #ifndef USG |
| 194 | #ifndef STRIDE |
| 195 | #ifndef UMAX |
| 196 | #ifndef sun386 |
| 197 | /* I have a suspicion that these are turned off on all systems |
| 198 | and can be deleted. Try it in version 19. */ |
| 199 | #include <filehdr.h> |
| 200 | #include <aouthdr.h> |
| 201 | #include <scnhdr.h> |
| 202 | #include <syms.h> |
| 203 | #endif /* not sun386 */ |
| 204 | #endif /* not UMAX */ |
| 205 | #endif /* Not STRIDE */ |
| 206 | #endif /* not USG */ |
| 207 | static long block_copy_start; /* Old executable start point */ |
| 208 | static struct filehdr f_hdr; /* File header */ |
| 209 | static struct aouthdr f_ohdr; /* Optional file header (a.out) */ |
| 210 | long bias; /* Bias to add for growth */ |
| 211 | long lnnoptr; /* Pointer to line-number info within file */ |
| 212 | #define SYMS_START block_copy_start |
| 213 | |
| 214 | static long text_scnptr; |
| 215 | static long data_scnptr; |
| 216 | #ifdef XCOFF |
| 217 | static long load_scnptr; |
| 218 | static long orig_load_scnptr; |
| 219 | static long orig_data_scnptr; |
| 220 | #endif |
| 221 | static long data_st; |
| 222 | |
| 223 | #ifndef MAX_SECTIONS |
| 224 | #define MAX_SECTIONS 10 |
| 225 | #endif |
| 226 | |
| 227 | #endif /* COFF */ |
| 228 | |
| 229 | static int pagemask; |
| 230 | |
| 231 | /* Correct an int which is the bit pattern of a pointer to a byte |
| 232 | into an int which is the number of a byte. |
| 233 | This is a no-op on ordinary machines, but not on all. */ |
| 234 | |
| 235 | #ifndef ADDR_CORRECT /* Let m-*.h files override this definition */ |
| 236 | #define ADDR_CORRECT(x) ((char *)(x) - (char*)0) |
| 237 | #endif |
| 238 | |
| 239 | #ifdef emacs |
| 240 | |
| 241 | static |
| 242 | report_error (file, fd) |
| 243 | char *file; |
| 244 | int fd; |
| 245 | { |
| 246 | if (fd) |
| 247 | close (fd); |
| 248 | error ("Failure operating on %s", file); |
| 249 | } |
| 250 | #endif /* emacs */ |
| 251 | |
| 252 | #define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1 |
| 253 | #define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1 |
| 254 | #define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1 |
| 255 | |
| 256 | static |
| 257 | report_error_1 (fd, msg, a1, a2) |
| 258 | int fd; |
| 259 | char *msg; |
| 260 | int a1, a2; |
| 261 | { |
| 262 | close (fd); |
| 263 | #ifdef emacs |
| 264 | error (msg, a1, a2); |
| 265 | #else |
| 266 | fprintf (stderr, msg, a1, a2); |
| 267 | fprintf (stderr, "\n"); |
| 268 | #endif |
| 269 | } |
| 270 | |
| 271 | static int make_hdr (); |
| 272 | static void mark_x (); |
| 273 | static int copy_text_and_data (); |
| 274 | static int copy_sym (); |
| 275 | \f |
| 276 | /* **************************************************************** |
| 277 | * unexec |
| 278 | * |
| 279 | * driving logic. |
| 280 | */ |
| 281 | unexec (new_name, a_name, data_start, bss_start, entry_address) |
| 282 | char *new_name, *a_name; |
| 283 | unsigned data_start, bss_start, entry_address; |
| 284 | { |
| 285 | int new, a_out = -1; |
| 286 | |
| 287 | if (a_name && (a_out = open (a_name, 0)) < 0) |
| 288 | { |
| 289 | PERROR (a_name); |
| 290 | } |
| 291 | if ((new = creat (new_name, 0666)) < 0) |
| 292 | { |
| 293 | PERROR (new_name); |
| 294 | } |
| 295 | if (make_hdr (new,a_out,data_start,bss_start,entry_address,a_name,new_name) < 0 |
| 296 | || copy_text_and_data (new) < 0 |
| 297 | || copy_sym (new, a_out, a_name, new_name) < 0 |
| 298 | #ifdef COFF |
| 299 | || adjust_lnnoptrs (new, a_out, new_name) < 0 |
| 300 | #endif |
| 301 | #ifdef XCOFF |
| 302 | || unrelocate_symbols (new, a_out, a_name, new_name) < 0 |
| 303 | #endif |
| 304 | ) |
| 305 | { |
| 306 | close (new); |
| 307 | /* unlink (new_name); /* Failed, unlink new a.out */ |
| 308 | return -1; |
| 309 | } |
| 310 | |
| 311 | close (new); |
| 312 | if (a_out >= 0) |
| 313 | close (a_out); |
| 314 | mark_x (new_name); |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | /* **************************************************************** |
| 319 | * make_hdr |
| 320 | * |
| 321 | * Make the header in the new a.out from the header in core. |
| 322 | * Modify the text and data sizes. |
| 323 | */ |
| 324 | static int |
| 325 | make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name) |
| 326 | int new, a_out; |
| 327 | unsigned data_start, bss_start, entry_address; |
| 328 | char *a_name; |
| 329 | char *new_name; |
| 330 | { |
| 331 | register int scns; |
| 332 | unsigned int bss_end; |
| 333 | |
| 334 | struct scnhdr section[MAX_SECTIONS]; |
| 335 | struct scnhdr * f_thdr; /* Text section header */ |
| 336 | struct scnhdr * f_dhdr; /* Data section header */ |
| 337 | struct scnhdr * f_bhdr; /* Bss section header */ |
| 338 | struct scnhdr * f_lhdr; /* Loader section header */ |
| 339 | struct scnhdr * f_tchdr; /* Typechk section header */ |
| 340 | struct scnhdr * f_dbhdr; /* Debug section header */ |
| 341 | struct scnhdr * f_xhdr; /* Except section header */ |
| 342 | |
| 343 | load_scnptr = orig_load_scnptr = lnnoptr = 0; |
| 344 | pagemask = getpagesize () - 1; |
| 345 | |
| 346 | /* Adjust text/data boundary. */ |
| 347 | #ifdef NO_REMAP |
| 348 | data_start = (long) start_of_data (); |
| 349 | #endif /* NO_REMAP */ |
| 350 | data_start = ADDR_CORRECT (data_start); |
| 351 | |
| 352 | #ifdef SEGMENT_MASK |
| 353 | data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */ |
| 354 | #else |
| 355 | data_start = data_start & ~pagemask; /* (Down) to page boundary. */ |
| 356 | #endif |
| 357 | |
| 358 | |
| 359 | bss_end = ADDR_CORRECT (sbrk (0)) + pagemask; |
| 360 | bss_end &= ~ pagemask; |
| 361 | /* Adjust data/bss boundary. */ |
| 362 | if (bss_start != 0) |
| 363 | { |
| 364 | bss_start = (ADDR_CORRECT (bss_start) + pagemask); |
| 365 | /* (Up) to page bdry. */ |
| 366 | bss_start &= ~ pagemask; |
| 367 | if (bss_start > bss_end) |
| 368 | { |
| 369 | ERROR1 ("unexec: Specified bss_start (%u) is past end of program", |
| 370 | bss_start); |
| 371 | } |
| 372 | } |
| 373 | else |
| 374 | bss_start = bss_end; |
| 375 | |
| 376 | if (data_start > bss_start) /* Can't have negative data size. */ |
| 377 | { |
| 378 | ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)", |
| 379 | data_start, bss_start); |
| 380 | } |
| 381 | |
| 382 | #ifdef COFF |
| 383 | /* Salvage as much info from the existing file as possible */ |
| 384 | block_copy_start = 0; |
| 385 | f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL; |
| 386 | f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL; |
| 387 | if (a_out >= 0) |
| 388 | { |
| 389 | if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
| 390 | { |
| 391 | PERROR (a_name); |
| 392 | } |
| 393 | block_copy_start += sizeof (f_hdr); |
| 394 | if (f_hdr.f_opthdr > 0) |
| 395 | { |
| 396 | if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) |
| 397 | { |
| 398 | PERROR (a_name); |
| 399 | } |
| 400 | block_copy_start += sizeof (f_ohdr); |
| 401 | } |
| 402 | if (f_hdr.f_nscns > MAX_SECTIONS) |
| 403 | { |
| 404 | ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS"); |
| 405 | } |
| 406 | /* Loop through section headers */ |
| 407 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
| 408 | struct scnhdr *s = §ion[scns]; |
| 409 | if (read (a_out, s, sizeof (*s)) != sizeof (*s)) |
| 410 | { |
| 411 | PERROR (a_name); |
| 412 | } |
| 413 | if (s->s_scnptr > 0L) |
| 414 | { |
| 415 | if (block_copy_start < s->s_scnptr + s->s_size) |
| 416 | block_copy_start = s->s_scnptr + s->s_size; |
| 417 | } |
| 418 | |
| 419 | #define CHECK_SCNHDR(ptr, name, flags) \ |
| 420 | if (strcmp(s->s_name, name) == 0) { \ |
| 421 | if (s->s_flags != flags) { \ |
| 422 | fprintf(stderr, "unexec: %x flags where %x expected in %s section.\n", \ |
| 423 | s->s_flags, flags, name); \ |
| 424 | } \ |
| 425 | if (ptr) { \ |
| 426 | fprintf(stderr, "unexec: duplicate section header for section %s.\n", \ |
| 427 | name); \ |
| 428 | } \ |
| 429 | ptr = s; \ |
| 430 | } |
| 431 | CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT); |
| 432 | CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA); |
| 433 | CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS); |
| 434 | CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER); |
| 435 | CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG); |
| 436 | CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK); |
| 437 | CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT); |
| 438 | } |
| 439 | |
| 440 | if (f_thdr == 0) |
| 441 | { |
| 442 | ERROR1 ("unexec: couldn't find \"%s\" section", _TEXT); |
| 443 | } |
| 444 | if (f_dhdr == 0) |
| 445 | { |
| 446 | ERROR1 ("unexec: couldn't find \"%s\" section", _DATA); |
| 447 | } |
| 448 | if (f_bhdr == 0) |
| 449 | { |
| 450 | ERROR1 ("unexec: couldn't find \"%s\" section", _BSS); |
| 451 | } |
| 452 | } |
| 453 | else |
| 454 | { |
| 455 | ERROR0 ("can't build a COFF file from scratch yet"); |
| 456 | } |
| 457 | orig_data_scnptr = f_dhdr->s_scnptr; |
| 458 | orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; |
| 459 | |
| 460 | /* Now we alter the contents of all the f_*hdr variables |
| 461 | to correspond to what we want to dump. */ |
| 462 | f_hdr.f_flags |= (F_RELFLG | F_EXEC); /* Why? */ |
| 463 | #ifdef EXEC_MAGIC |
| 464 | f_ohdr.magic = EXEC_MAGIC; |
| 465 | #endif |
| 466 | #ifndef NO_REMAP |
| 467 | f_ohdr.tsize = data_start - f_ohdr.text_start; |
| 468 | f_ohdr.text_start = (long) start_of_text (); |
| 469 | #endif |
| 470 | f_ohdr.dsize = bss_start - ((unsigned) &_data); |
| 471 | f_ohdr.bsize = bss_end - bss_start; |
| 472 | |
| 473 | f_dhdr->s_size = f_ohdr.dsize; |
| 474 | f_bhdr->s_size = f_ohdr.bsize; |
| 475 | f_bhdr->s_paddr = f_ohdr.dsize; |
| 476 | f_bhdr->s_vaddr = f_ohdr.dsize; |
| 477 | |
| 478 | /* fix scnptr's */ |
| 479 | { |
| 480 | long ptr; |
| 481 | |
| 482 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
| 483 | struct scnhdr *s = §ion[scns]; |
| 484 | if (scns == 0) |
| 485 | ptr = s->s_scnptr; |
| 486 | |
| 487 | if (s->s_scnptr != 0) |
| 488 | { |
| 489 | s->s_scnptr = ptr; |
| 490 | } |
| 491 | |
| 492 | if ((s->s_flags & 0xffff) == STYP_PAD) |
| 493 | { |
| 494 | /* |
| 495 | * the text_start should probably be o_algntext but that doesn't |
| 496 | * seem to change |
| 497 | */ |
| 498 | if (f_ohdr.text_start != 0) /* && scns != 0 */ |
| 499 | { |
| 500 | s->s_size = 512 - (s->s_scnptr % 512); |
| 501 | if (s->s_size == 512) |
| 502 | s->s_size = 0; |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | ptr = ptr + s->s_size; |
| 507 | } |
| 508 | |
| 509 | bias = ptr - block_copy_start; |
| 510 | } |
| 511 | |
| 512 | /* fix other pointers */ |
| 513 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
| 514 | struct scnhdr *s = §ion[scns]; |
| 515 | |
| 516 | if (s->s_relptr != 0) |
| 517 | { |
| 518 | s->s_relptr += bias; |
| 519 | } |
| 520 | if (s->s_lnnoptr != 0) |
| 521 | { |
| 522 | if (lnnoptr == 0) lnnoptr = s->s_lnnoptr; |
| 523 | s->s_lnnoptr += bias; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | if (f_hdr.f_symptr > 0L) |
| 528 | { |
| 529 | f_hdr.f_symptr += bias; |
| 530 | } |
| 531 | |
| 532 | data_st = data_start; |
| 533 | text_scnptr = f_thdr->s_scnptr; |
| 534 | data_scnptr = f_dhdr->s_scnptr; |
| 535 | load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0; |
| 536 | block_copy_start = orig_load_scnptr; |
| 537 | |
| 538 | #ifdef ADJUST_EXEC_HEADER |
| 539 | ADJUST_EXEC_HEADER |
| 540 | #endif /* ADJUST_EXEC_HEADER */ |
| 541 | |
| 542 | if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) |
| 543 | { |
| 544 | PERROR (new_name); |
| 545 | } |
| 546 | |
| 547 | if (f_hdr.f_opthdr > 0) |
| 548 | { |
| 549 | if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) |
| 550 | { |
| 551 | PERROR (new_name); |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | for (scns = 0; scns < f_hdr.f_nscns; scns++) { |
| 556 | struct scnhdr *s = §ion[scns]; |
| 557 | if (write (new, s, sizeof (*s)) != sizeof (*s)) |
| 558 | { |
| 559 | PERROR (new_name); |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | return (0); |
| 564 | |
| 565 | #endif /* COFF */ |
| 566 | } |
| 567 | \f |
| 568 | /* **************************************************************** |
| 569 | |
| 570 | * |
| 571 | * Copy the text and data segments from memory to the new a.out |
| 572 | */ |
| 573 | static int |
| 574 | copy_text_and_data (new) |
| 575 | int new; |
| 576 | { |
| 577 | register char *end; |
| 578 | register char *ptr; |
| 579 | |
| 580 | lseek (new, (long) text_scnptr, 0); |
| 581 | ptr = start_of_text () + text_scnptr; |
| 582 | end = ptr + f_ohdr.tsize; |
| 583 | write_segment (new, ptr, end); |
| 584 | |
| 585 | lseek (new, (long) data_scnptr, 0); |
| 586 | ptr = (char *) &_data; |
| 587 | end = ptr + f_ohdr.dsize; |
| 588 | write_segment (new, ptr, end); |
| 589 | |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | write_segment (new, ptr, end) |
| 594 | int new; |
| 595 | register char *ptr, *end; |
| 596 | { |
| 597 | register int i, nwrite, ret; |
| 598 | char buf[80]; |
| 599 | extern int errno; |
| 600 | char zeros[128]; |
| 601 | |
| 602 | bzero (zeros, sizeof zeros); |
| 603 | |
| 604 | for (i = 0; ptr < end;) |
| 605 | { |
| 606 | /* distance to next multiple of 128. */ |
| 607 | nwrite = (((int) ptr + 128) & -128) - (int) ptr; |
| 608 | /* But not beyond specified end. */ |
| 609 | if (nwrite > end - ptr) nwrite = end - ptr; |
| 610 | ret = write (new, ptr, nwrite); |
| 611 | /* If write gets a page fault, it means we reached |
| 612 | a gap between the old text segment and the old data segment. |
| 613 | This gap has probably been remapped into part of the text segment. |
| 614 | So write zeros for it. */ |
| 615 | if (ret == -1 && errno == EFAULT) |
| 616 | { |
| 617 | write (new, zeros, nwrite); |
| 618 | } |
| 619 | else if (nwrite != ret) |
| 620 | { |
| 621 | sprintf (buf, |
| 622 | "unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d", |
| 623 | ptr, new, nwrite, ret, errno); |
| 624 | PERROR (buf); |
| 625 | } |
| 626 | i += nwrite; |
| 627 | ptr += nwrite; |
| 628 | } |
| 629 | } |
| 630 | \f |
| 631 | /* **************************************************************** |
| 632 | * copy_sym |
| 633 | * |
| 634 | * Copy the relocation information and symbol table from the a.out to the new |
| 635 | */ |
| 636 | static int |
| 637 | copy_sym (new, a_out, a_name, new_name) |
| 638 | int new, a_out; |
| 639 | char *a_name, *new_name; |
| 640 | { |
| 641 | char page[1024]; |
| 642 | int n; |
| 643 | |
| 644 | if (a_out < 0) |
| 645 | return 0; |
| 646 | |
| 647 | if (SYMS_START == 0L) |
| 648 | return 0; |
| 649 | |
| 650 | if (lnnoptr && lnnoptr < SYMS_START) /* if there is line number info */ |
| 651 | lseek (a_out, lnnoptr, 0); /* start copying from there */ |
| 652 | else |
| 653 | lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */ |
| 654 | |
| 655 | while ((n = read (a_out, page, sizeof page)) > 0) |
| 656 | { |
| 657 | if (write (new, page, n) != n) |
| 658 | { |
| 659 | PERROR (new_name); |
| 660 | } |
| 661 | } |
| 662 | if (n < 0) |
| 663 | { |
| 664 | PERROR (a_name); |
| 665 | } |
| 666 | return 0; |
| 667 | } |
| 668 | \f |
| 669 | /* **************************************************************** |
| 670 | * mark_x |
| 671 | * |
| 672 | * After successfully building the new a.out, mark it executable |
| 673 | */ |
| 674 | static void |
| 675 | mark_x (name) |
| 676 | char *name; |
| 677 | { |
| 678 | struct stat sbuf; |
| 679 | int um; |
| 680 | int new = 0; /* for PERROR */ |
| 681 | |
| 682 | um = umask (777); |
| 683 | umask (um); |
| 684 | if (stat (name, &sbuf) == -1) |
| 685 | { |
| 686 | PERROR (name); |
| 687 | } |
| 688 | sbuf.st_mode |= 0111 & ~um; |
| 689 | if (chmod (name, sbuf.st_mode) == -1) |
| 690 | PERROR (name); |
| 691 | } |
| 692 | \f |
| 693 | /* |
| 694 | * If the COFF file contains a symbol table and a line number section, |
| 695 | * then any auxiliary entries that have values for x_lnnoptr must |
| 696 | * be adjusted by the amount that the line number section has moved |
| 697 | * in the file (bias computed in make_hdr). The #@$%&* designers of |
| 698 | * the auxiliary entry structures used the absolute file offsets for |
| 699 | * the line number entry rather than an offset from the start of the |
| 700 | * line number section! |
| 701 | * |
| 702 | * When I figure out how to scan through the symbol table and pick out |
| 703 | * the auxiliary entries that need adjustment, this routine will |
| 704 | * be fixed. As it is now, all such entries are wrong and sdb |
| 705 | * will complain. Fred Fish, UniSoft Systems Inc. |
| 706 | */ |
| 707 | |
| 708 | #ifdef COFF |
| 709 | |
| 710 | /* This function is probably very slow. Instead of reopening the new |
| 711 | file for input and output it should copy from the old to the new |
| 712 | using the two descriptors already open (WRITEDESC and READDESC). |
| 713 | Instead of reading one small structure at a time it should use |
| 714 | a reasonable size buffer. But I don't have time to work on such |
| 715 | things, so I am installing it as submitted to me. -- RMS. */ |
| 716 | |
| 717 | adjust_lnnoptrs (writedesc, readdesc, new_name) |
| 718 | int writedesc; |
| 719 | int readdesc; |
| 720 | char *new_name; |
| 721 | { |
| 722 | register int nsyms; |
| 723 | register int new; |
| 724 | #ifdef amdahl_uts |
| 725 | SYMENT symentry; |
| 726 | AUXENT auxentry; |
| 727 | #else |
| 728 | struct syment symentry; |
| 729 | union auxent auxentry; |
| 730 | #endif |
| 731 | |
| 732 | if (!lnnoptr || !f_hdr.f_symptr) |
| 733 | return 0; |
| 734 | |
| 735 | if ((new = open (new_name, 2)) < 0) |
| 736 | { |
| 737 | PERROR (new_name); |
| 738 | return -1; |
| 739 | } |
| 740 | |
| 741 | lseek (new, f_hdr.f_symptr, 0); |
| 742 | for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++) |
| 743 | { |
| 744 | read (new, &symentry, SYMESZ); |
| 745 | if (symentry.n_numaux) |
| 746 | { |
| 747 | read (new, &auxentry, AUXESZ); |
| 748 | nsyms++; |
| 749 | if (ISFCN (symentry.n_type)) { |
| 750 | auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias; |
| 751 | lseek (new, -AUXESZ, 1); |
| 752 | write (new, &auxentry, AUXESZ); |
| 753 | } |
| 754 | } |
| 755 | } |
| 756 | close (new); |
| 757 | } |
| 758 | |
| 759 | #endif /* COFF */ |
| 760 | |
| 761 | #ifdef XCOFF |
| 762 | |
| 763 | /* It is probably a false economy to optimise this routine (it used to |
| 764 | read one LDREL and do do two lseeks per iteration) but the wrath of |
| 765 | RMS (see above :-) would be too much to bear */ |
| 766 | |
| 767 | unrelocate_symbols (new, a_out, a_name, new_name) |
| 768 | int new, a_out; |
| 769 | char *a_name, *new_name; |
| 770 | { |
| 771 | register int i; |
| 772 | register int l; |
| 773 | register LDREL *ldrel; |
| 774 | LDHDR ldhdr; |
| 775 | LDREL ldrel_buf [20]; |
| 776 | ulong t_start = (ulong) &_text; |
| 777 | ulong d_start = (ulong) &_data; |
| 778 | int * p; |
| 779 | int dirty; |
| 780 | |
| 781 | if (load_scnptr == 0) |
| 782 | return 0; |
| 783 | |
| 784 | lseek (a_out, orig_load_scnptr, 0); |
| 785 | if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr)) |
| 786 | { |
| 787 | PERROR (new_name); |
| 788 | } |
| 789 | |
| 790 | #define SYMNDX_TEXT 0 |
| 791 | #define SYMNDX_DATA 1 |
| 792 | #define SYMNDX_BSS 2 |
| 793 | l = 0; |
| 794 | for (i = 0; i < ldhdr.l_nreloc; i++, l--, ldrel++) |
| 795 | { |
| 796 | if (l == 0) { |
| 797 | lseek (a_out, |
| 798 | orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, |
| 799 | 0); |
| 800 | |
| 801 | l = ldhdr.l_nreloc - i; |
| 802 | if (l > sizeof (ldrel_buf) / LDRELSZ) |
| 803 | l = sizeof (ldrel_buf) / LDRELSZ; |
| 804 | |
| 805 | if (read (a_out, ldrel_buf, l * LDRELSZ) != l * LDRELSZ) |
| 806 | { |
| 807 | PERROR (a_name); |
| 808 | } |
| 809 | ldrel = ldrel_buf; |
| 810 | } |
| 811 | dirty = 0; |
| 812 | |
| 813 | /* this code may not be necessary */ |
| 814 | /* I originally had == in the "assignment" and it still unrelocated */ |
| 815 | |
| 816 | /* move the BSS loader symbols to the DATA segment */ |
| 817 | if (ldrel->l_rsecnm == f_ohdr.o_snbss) |
| 818 | ldrel->l_rsecnm = f_ohdr.o_sndata, dirty++; |
| 819 | |
| 820 | if (ldrel->l_symndx == SYMNDX_BSS) |
| 821 | ldrel->l_symndx = SYMNDX_DATA, dirty++; |
| 822 | |
| 823 | if (dirty) |
| 824 | { |
| 825 | lseek (new, |
| 826 | load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i, |
| 827 | 0); |
| 828 | |
| 829 | if (write (new, ldrel, LDRELSZ) != LDRELSZ) |
| 830 | { |
| 831 | PERROR (new_name); |
| 832 | } |
| 833 | } |
| 834 | |
| 835 | if (ldrel->l_rsecnm == f_ohdr.o_sndata) |
| 836 | { |
| 837 | int orig_int; |
| 838 | |
| 839 | lseek (a_out, orig_data_scnptr + ldrel->l_vaddr, 0); |
| 840 | |
| 841 | if (read (a_out, (void *) &orig_int, sizeof (orig_int)) != sizeof (orig_int)) |
| 842 | { |
| 843 | PERROR (a_name); |
| 844 | } |
| 845 | |
| 846 | switch (ldrel->l_symndx) { |
| 847 | case SYMNDX_TEXT: |
| 848 | p = (int *) (d_start + ldrel->l_vaddr); |
| 849 | orig_int = * p - (t_start - f_ohdr.text_start); |
| 850 | break; |
| 851 | |
| 852 | case SYMNDX_DATA: |
| 853 | case SYMNDX_BSS: |
| 854 | p = (int *) (d_start + ldrel->l_vaddr); |
| 855 | orig_int = * p - (d_start - f_ohdr.data_start); |
| 856 | break; |
| 857 | } |
| 858 | |
| 859 | lseek (new, data_scnptr + ldrel->l_vaddr, 0); |
| 860 | if (write (new, (void *) &orig_int, sizeof (orig_int)) != sizeof (orig_int)) |
| 861 | { |
| 862 | PERROR (new_name); |
| 863 | } |
| 864 | } |
| 865 | } |
| 866 | } |
| 867 | #endif /* XCOFF */ |
| 868 | |
| 869 | #endif /* not CANNOT_UNEXEC */ |
| 870 | |
| 871 | #endif /* not CANNOT_DUMP */ |