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annotate src/unexalpha.c @ 5697:40fbceabaafd
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| author | Stephen J. Turnbull <stephen@xemacs.org> |
|---|---|
| date | Mon, 24 Dec 2012 03:08:33 +0900 |
| parents | 308d34e9f07d |
| children |
| rev | line source |
|---|---|
| 428 | 1 /* Unexec for DEC alpha. schoepf@sc.ZIB-Berlin.DE (Rainer Schoepf). |
| 2 | |
| 3 Copyright (C) 1994 Free Software Foundation, Inc. | |
| 4 | |
| 613 | 5 This file is part of XEmacs. |
| 428 | 6 |
|
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7 XEmacs is free software: you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation, either version 3 of the License, or (at your |
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10 option) any later version. |
| 428 | 11 |
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
| 428 | 16 |
| 17 You should have received a copy of the GNU General Public License | |
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18 along with XEmacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 428 | 19 |
| 20 /* Synched up with: FSF 19.31. */ | |
| 21 | |
| 22 | |
| 23 #include <config.h> | |
| 24 #include <stdlib.h> | |
| 25 #include <string.h> | |
| 26 #include <unistd.h> | |
| 27 #include <sys/types.h> | |
| 28 #include <sys/file.h> | |
| 29 #include <sys/stat.h> | |
| 30 #include <sys/mman.h> | |
| 31 #include <stdio.h> | |
| 438 | 32 #include <errno.h> |
| 428 | 33 #include <varargs.h> |
| 34 #include <filehdr.h> | |
| 35 #include <aouthdr.h> | |
| 36 #include <scnhdr.h> | |
| 37 #include <syms.h> | |
| 2286 | 38 #include "compiler.h" |
| 428 | 39 |
| 40 static void fatal_unexec (char *, char *); | |
| 41 static void mark_x (char *); | |
| 42 | |
| 43 #define READ(_fd, _buffer, _size, _error_message, _error_arg) \ | |
| 44 errno = EEOF; \ | |
| 45 if (read (_fd, _buffer, _size) != _size) \ | |
| 46 fatal_unexec (_error_message, _error_arg); | |
| 47 | |
| 48 #define WRITE(_fd, _buffer, _size, _error_message, _error_arg) \ | |
| 49 if (write (_fd, _buffer, _size) != _size) \ | |
| 50 fatal_unexec (_error_message, _error_arg); | |
| 51 | |
| 52 #define SEEK(_fd, _position, _error_message, _error_arg) \ | |
| 53 errno = EEOF; \ | |
| 54 if (lseek (_fd, _position, L_SET) != _position) \ | |
| 55 fatal_unexec (_error_message, _error_arg); | |
| 56 | |
| 57 #define EEOF -1 | |
| 58 | |
| 59 static struct scnhdr *text_section; | |
| 60 static struct scnhdr *init_section; | |
| 61 static struct scnhdr *finit_section; | |
| 62 static struct scnhdr *rdata_section; | |
| 63 static struct scnhdr *rconst_section; | |
| 64 static struct scnhdr *data_section; | |
| 65 static struct scnhdr *pdata_section; | |
| 66 static struct scnhdr *xdata_section; | |
| 67 static struct scnhdr *got_section; | |
| 68 static struct scnhdr *lit8_section; | |
| 69 static struct scnhdr *lit4_section; | |
| 70 static struct scnhdr *sdata_section; | |
| 71 static struct scnhdr *sbss_section; | |
| 72 static struct scnhdr *bss_section; | |
| 73 | |
| 74 static unsigned long Brk; | |
| 75 | |
| 76 struct headers { | |
| 77 struct filehdr fhdr; | |
| 78 struct aouthdr aout; | |
| 79 struct scnhdr section[_MIPS_NSCNS_MAX]; | |
| 80 }; | |
| 81 | |
| 82 | |
| 83 /* Define name of label for entry point for the dumped executable. */ | |
| 84 | |
| 85 #ifndef DEFAULT_ENTRY_ADDRESS | |
| 86 #define DEFAULT_ENTRY_ADDRESS __start | |
| 87 #endif | |
| 442 | 88 EXTERN_C int DEFAULT_ENTRY_ADDRESS (void); |
| 89 | |
| 428 | 90 |
| 91 int | |
| 92 unexec (char *new_name, char *a_name, | |
| 93 unsigned long data_start, | |
| 2286 | 94 unsigned long UNUSED (bss_start), |
| 428 | 95 unsigned long entry_address) |
| 96 { | |
| 3025 | 97 int new_, old; |
| 428 | 98 char * oldptr; |
| 99 struct headers ohdr, nhdr; | |
| 100 struct stat stat; | |
| 101 long pagesize, brk; | |
| 102 long newsyms, symrel; | |
| 103 int i; | |
| 104 long vaddr, scnptr; | |
| 105 #define BUFSIZE 8192 | |
| 106 char buffer[BUFSIZE]; | |
| 107 | |
| 108 if ((old = open (a_name, O_RDONLY)) < 0) | |
| 109 fatal_unexec ("opening %s", a_name); | |
| 110 | |
| 3025 | 111 new_ = creat (new_name, 0666); |
| 112 if (new_ < 0) fatal_unexec ("creating %s", new_name); | |
| 428 | 113 |
| 114 if ((fstat (old, &stat) == -1)) | |
| 115 fatal_unexec ("fstat %s", a_name); | |
| 116 | |
| 117 oldptr = (char *)mmap (0, stat.st_size, PROT_READ, MAP_FILE|MAP_SHARED, old, 0); | |
| 118 | |
| 119 if (oldptr == (char *)-1) | |
| 120 fatal_unexec ("mmap %s", a_name); | |
| 121 | |
| 122 close (old); | |
| 123 | |
| 124 /* This is a copy of the a.out header of the original executable */ | |
| 125 | |
| 126 ohdr = (*(struct headers *)oldptr); | |
| 127 | |
| 128 /* This is where we build the new header from the in-memory copy */ | |
| 129 | |
| 130 nhdr = *((struct headers *)TEXT_START); | |
| 131 | |
| 132 /* First do some consistency checks */ | |
| 133 | |
| 134 if (nhdr.fhdr.f_magic != ALPHAMAGIC | |
| 135 && nhdr.fhdr.f_magic != ALPHAUMAGIC) | |
| 136 { | |
| 137 fprintf (stderr, "unexec: input file magic number is %x, not %x or %x.\n", | |
| 138 nhdr.fhdr.f_magic, ALPHAMAGIC, ALPHAUMAGIC); | |
| 139 exit (1); | |
| 140 } | |
| 141 | |
| 142 if (nhdr.fhdr.f_opthdr != sizeof (nhdr.aout)) | |
| 143 { | |
| 144 fprintf (stderr, "unexec: input a.out header is %d bytes, not %ld.\n", | |
| 145 nhdr.fhdr.f_opthdr, (long) (sizeof (nhdr.aout))); | |
| 146 exit (1); | |
| 147 } | |
| 148 if (nhdr.aout.magic != ZMAGIC) | |
| 149 { | |
| 150 fprintf (stderr, "unexec: input file a.out magic number is %o, not %o.\n", | |
| 151 nhdr.aout.magic, ZMAGIC); | |
| 152 exit (1); | |
| 153 } | |
| 154 | |
| 155 | |
| 156 /* Now check the existence of certain header section and grab | |
| 157 their addresses. */ | |
| 158 | |
| 159 #define CHECK_SCNHDR(ptr, name, flags) \ | |
| 160 ptr = NULL; \ | |
| 161 for (i = 0; i < nhdr.fhdr.f_nscns && !ptr; i++) \ | |
| 162 if (strcmp (nhdr.section[i].s_name, name) == 0) \ | |
| 163 { \ | |
| 164 if (nhdr.section[i].s_flags != flags) \ | |
| 165 fprintf (stderr, "unexec: %x flags (%x expected) in %s section.\n", \ | |
| 166 nhdr.section[i].s_flags, flags, name); \ | |
| 167 ptr = nhdr.section + i; \ | |
| 168 } \ | |
| 169 | |
| 170 CHECK_SCNHDR (text_section, _TEXT, STYP_TEXT); | |
| 171 CHECK_SCNHDR (init_section, _INIT, STYP_INIT); | |
| 172 #ifdef _FINI | |
| 173 CHECK_SCNHDR (finit_section, _FINI, STYP_FINI); | |
| 174 #endif /* _FINI */ | |
| 175 CHECK_SCNHDR (rdata_section, _RDATA, STYP_RDATA); | |
| 176 #ifdef _RCONST | |
| 177 CHECK_SCNHDR (rconst_section, _RCONST, STYP_RCONST); | |
| 178 #endif | |
| 179 #ifdef _PDATA | |
| 180 CHECK_SCNHDR (pdata_section, _PDATA, STYP_PDATA); | |
| 181 #endif /* _PDATA */ | |
| 182 #ifdef _GOT | |
| 183 CHECK_SCNHDR (got_section, _GOT, STYP_GOT); | |
| 184 #endif /* _GOT */ | |
| 185 CHECK_SCNHDR (data_section, _DATA, STYP_DATA); | |
| 186 #ifdef _XDATA | |
| 187 CHECK_SCNHDR (xdata_section, _XDATA, STYP_XDATA); | |
| 188 #endif /* _XDATA */ | |
| 189 #ifdef _LIT8 | |
| 190 CHECK_SCNHDR (lit8_section, _LIT8, STYP_LIT8); | |
| 191 CHECK_SCNHDR (lit4_section, _LIT4, STYP_LIT4); | |
| 192 #endif /* _LIT8 */ | |
| 193 CHECK_SCNHDR (sdata_section, _SDATA, STYP_SDATA); | |
| 194 CHECK_SCNHDR (sbss_section, _SBSS, STYP_SBSS); | |
| 195 CHECK_SCNHDR (bss_section, _BSS, STYP_BSS); | |
| 196 | |
| 197 | |
| 198 pagesize = getpagesize (); | |
| 199 brk = (((long) (sbrk (0))) + pagesize - 1) & (-pagesize); | |
| 200 | |
| 201 /* Remember the current break */ | |
| 202 | |
| 203 Brk = brk; | |
| 204 | |
| 205 nhdr.aout.dsize = brk - DATA_START; | |
| 206 nhdr.aout.bsize = 0; | |
| 207 if (entry_address == 0) | |
| 208 { | |
| 209 nhdr.aout.entry = (unsigned long)DEFAULT_ENTRY_ADDRESS; | |
| 210 } | |
| 211 else | |
| 212 nhdr.aout.entry = entry_address; | |
| 213 | |
| 214 nhdr.aout.bss_start = nhdr.aout.data_start + nhdr.aout.dsize; | |
| 215 | |
| 216 if (rdata_section != NULL) | |
| 217 { | |
| 218 rdata_section->s_size = data_start - DATA_START; | |
| 219 | |
| 220 /* Adjust start and virtual addresses of rdata_section, too. */ | |
| 221 rdata_section->s_vaddr = DATA_START; | |
| 222 rdata_section->s_paddr = DATA_START; | |
| 223 rdata_section->s_scnptr = text_section->s_scnptr + nhdr.aout.tsize; | |
| 224 } | |
| 225 | |
| 226 data_section->s_vaddr = data_start; | |
| 227 data_section->s_paddr = data_start; | |
| 228 data_section->s_size = brk - data_start; | |
| 229 | |
| 230 if (rdata_section != NULL) | |
| 231 { | |
| 232 data_section->s_scnptr = rdata_section->s_scnptr + rdata_section->s_size; | |
| 233 } | |
| 234 | |
| 235 vaddr = data_section->s_vaddr + data_section->s_size; | |
| 236 scnptr = data_section->s_scnptr + data_section->s_size; | |
| 237 if (lit8_section != NULL) | |
| 238 { | |
| 239 lit8_section->s_vaddr = vaddr; | |
| 240 lit8_section->s_paddr = vaddr; | |
| 241 lit8_section->s_size = 0; | |
| 242 lit8_section->s_scnptr = scnptr; | |
| 243 } | |
| 244 if (lit4_section != NULL) | |
| 245 { | |
| 246 lit4_section->s_vaddr = vaddr; | |
| 247 lit4_section->s_paddr = vaddr; | |
| 248 lit4_section->s_size = 0; | |
| 249 lit4_section->s_scnptr = scnptr; | |
| 250 } | |
| 251 if (sdata_section != NULL) | |
| 252 { | |
| 253 sdata_section->s_vaddr = vaddr; | |
| 254 sdata_section->s_paddr = vaddr; | |
| 255 sdata_section->s_size = 0; | |
| 256 sdata_section->s_scnptr = scnptr; | |
| 257 } | |
| 258 #ifdef _XDATA | |
| 259 if (xdata_section != NULL) | |
| 260 { | |
| 261 xdata_section->s_vaddr = vaddr; | |
| 262 xdata_section->s_paddr = vaddr; | |
| 263 xdata_section->s_size = 0; | |
| 264 xdata_section->s_scnptr = scnptr; | |
| 265 } | |
| 266 #endif | |
| 267 #ifdef _GOT | |
| 268 if (got_section != NULL) | |
| 269 { | |
| 270 got_section->s_vaddr = vaddr; | |
| 271 got_section->s_paddr = vaddr; | |
| 272 got_section->s_size = 0; | |
| 273 got_section->s_scnptr = scnptr; | |
| 274 } | |
| 275 #endif /*_GOT */ | |
| 276 if (sbss_section != NULL) | |
| 277 { | |
| 278 sbss_section->s_vaddr = vaddr; | |
| 279 sbss_section->s_paddr = vaddr; | |
| 280 sbss_section->s_size = 0; | |
| 281 sbss_section->s_scnptr = scnptr; | |
| 282 } | |
| 283 if (bss_section != NULL) | |
| 284 { | |
| 285 bss_section->s_vaddr = vaddr; | |
| 286 bss_section->s_paddr = vaddr; | |
| 287 bss_section->s_size = 0; | |
| 288 bss_section->s_scnptr = scnptr; | |
| 289 } | |
| 290 | |
| 3025 | 291 WRITE (new_, (char *)TEXT_START, nhdr.aout.tsize, |
| 428 | 292 "writing text section to %s", new_name); |
| 3025 | 293 WRITE (new_, (char *)DATA_START, nhdr.aout.dsize, |
| 428 | 294 "writing data section to %s", new_name); |
| 295 | |
| 296 | |
| 297 /* | |
| 298 * Construct new symbol table header | |
| 299 */ | |
| 300 | |
| 301 memcpy (buffer, oldptr + nhdr.fhdr.f_symptr, cbHDRR); | |
| 302 | |
| 303 #define symhdr ((pHDRR)buffer) | |
| 304 newsyms = nhdr.aout.tsize + nhdr.aout.dsize; | |
| 305 symrel = newsyms - nhdr.fhdr.f_symptr; | |
| 306 nhdr.fhdr.f_symptr = newsyms; | |
| 307 symhdr->cbLineOffset += symrel; | |
| 308 symhdr->cbDnOffset += symrel; | |
| 309 symhdr->cbPdOffset += symrel; | |
| 310 symhdr->cbSymOffset += symrel; | |
| 311 symhdr->cbOptOffset += symrel; | |
| 312 symhdr->cbAuxOffset += symrel; | |
| 313 symhdr->cbSsOffset += symrel; | |
| 314 symhdr->cbSsExtOffset += symrel; | |
| 315 symhdr->cbFdOffset += symrel; | |
| 316 symhdr->cbRfdOffset += symrel; | |
| 317 symhdr->cbExtOffset += symrel; | |
| 318 | |
| 3025 | 319 WRITE (new_, buffer, cbHDRR, "writing symbol table header of %s", new_name); |
| 428 | 320 |
| 321 /* | |
| 322 * Copy the symbol table and line numbers | |
| 323 */ | |
| 3025 | 324 WRITE (new_, oldptr + ohdr.fhdr.f_symptr + cbHDRR, |
| 428 | 325 stat.st_size - ohdr.fhdr.f_symptr - cbHDRR, |
| 326 "writing symbol table of %s", new_name); | |
| 327 | |
| 328 #if 0 | |
| 329 | |
| 330 /* Not needed for now */ | |
| 331 | |
| 3025 | 332 update_dynamic_symbols (oldptr, new_name, new_, newsyms, |
| 428 | 333 ((pHDRR) (oldptr + ohdr.fhdr.f_symptr))->issExtMax, |
| 334 ((pHDRR) (oldptr + ohdr.fhdr.f_symptr))->cbExtOffset, | |
| 335 ((pHDRR) (oldptr + ohdr.fhdr.f_symptr))->cbSsExtOffset); | |
| 336 | |
| 337 #endif | |
| 338 | |
| 339 #undef symhdr | |
| 340 | |
| 3025 | 341 SEEK (new_, 0, "seeking to start of header in %s", new_name); |
| 342 WRITE (new_, &nhdr, sizeof (nhdr), | |
| 428 | 343 "writing header of %s", new_name); |
| 344 | |
| 345 close (old); | |
| 3025 | 346 close (new_); |
| 428 | 347 mark_x (new_name); |
| 348 return 0; | |
| 349 } | |
| 350 | |
| 351 | |
| 352 #if 0 | |
| 353 | |
| 354 /* Not needed for now */ | |
| 355 | |
| 356 /* The following function updates the values of some symbols | |
| 357 that are used by the dynamic loader: | |
| 358 | |
| 359 _edata | |
| 360 _end | |
| 361 | |
| 362 */ | |
| 363 | |
| 364 int | |
| 365 update_dynamic_symbols ( | |
| 366 char *old, /* Pointer to old executable */ | |
| 367 char *new_name, /* Name of new executable */ | |
| 3025 | 368 int new_, /* File descriptor for new executable */ |
| 428 | 369 long newsyms, /* Offset of Symbol table in new executable */ |
| 370 int nsyms, /* Number of symbol table entries */ | |
| 371 long symoff, /* Offset of External Symbols in old file */ | |
| 372 long stroff) /* Offset of string table in old file */ | |
| 373 { | |
| 374 long i; | |
| 375 int found = 0; | |
| 376 EXTR n_end, n_edata; | |
| 377 | |
| 378 /* We go through the symbol table entries until we have found the two | |
| 379 symbols. */ | |
| 380 | |
| 381 /* cbEXTR is the size of an external symbol table entry */ | |
| 382 | |
| 383 for (i = 0; i < nsyms && found < 2; i += cbEXTR) | |
| 384 { | |
| 385 REGISTER pEXTR x = (pEXTR) (old + symoff + i); | |
| 386 char *s; | |
| 387 | |
| 388 s = old + stroff + x->asym.iss; /* name of the symbol */ | |
| 389 | |
| 390 if (!strcmp(s,"_edata")) | |
| 391 { | |
| 392 found++; | |
| 393 memcpy (&n_edata, x, cbEXTR); | |
| 394 n_edata.asym.value = Brk; | |
| 3025 | 395 SEEK (new_, newsyms + cbHDRR + i, |
| 428 | 396 "seeking to symbol _edata in %s", new_name); |
| 3025 | 397 WRITE (new_, &n_edata, cbEXTR, |
| 428 | 398 "writing symbol table entry for _edata into %s", new_name); |
| 399 } | |
| 400 else if (!strcmp(s,"_end")) | |
| 401 { | |
| 402 found++; | |
| 403 memcpy (&n_end, x, cbEXTR); | |
| 404 n_end.asym.value = Brk; | |
| 3025 | 405 SEEK (new_, newsyms + cbHDRR + i, |
| 428 | 406 "seeking to symbol _end in %s", new_name); |
| 3025 | 407 WRITE (new_, &n_end, cbEXTR, |
| 428 | 408 "writing symbol table entry for _end into %s", new_name); |
| 409 } | |
| 410 } | |
| 411 | |
| 412 } | |
| 413 | |
| 414 #endif | |
| 415 | |
| 416 | |
| 417 /* | |
| 418 * mark_x | |
| 419 * | |
| 420 * After successfully building the new a.out, mark it executable | |
| 421 */ | |
| 422 | |
| 423 static void | |
| 424 mark_x (char *name) | |
| 425 { | |
| 426 struct stat sbuf; | |
| 427 int um = umask (777); | |
| 428 umask (um); | |
| 429 if (stat (name, &sbuf) < 0) | |
| 430 fatal_unexec ("getting protection on %s", name); | |
| 431 sbuf.st_mode |= 0111 & ~um; | |
| 432 if (chmod (name, sbuf.st_mode) < 0) | |
| 433 fatal_unexec ("setting protection on %s", name); | |
| 434 } | |
| 435 | |
| 436 static void | |
| 437 fatal_unexec (char *s, char *arg) | |
| 438 { | |
| 439 if (errno == EEOF) | |
| 440 fputs ("unexec: unexpected end of file, ", stderr); | |
| 441 else | |
| 442 fprintf (stderr, "unexec: %s, ", strerror (errno)); | |
| 443 fprintf (stderr, s, arg); | |
| 444 fputs (".\n", stderr); | |
| 445 exit (1); | |
| 446 } |