0
+ − 1 /* Unexec for Siemens machines running Sinix (modified SVR4).
+ − 2 Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993, 1994, 1995
+ − 3 Free Software Foundation, Inc.
+ − 4
613
+ − 5 This file is part of XEmacs.
0
+ − 6
613
+ − 7 XEmacs is free software; you can redistribute it and/or modify
0
+ − 8 it under the terms of the GNU General Public License as published by
+ − 9 the Free Software Foundation; either version 2, or (at your option)
+ − 10 any later version.
+ − 11
613
+ − 12 XEmacs is distributed in the hope that it will be useful,
0
+ − 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
613
+ − 18 along with XEmacs; see the file COPYING. If not, write to
0
+ − 19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ − 20 Boston, MA 02111-1307, USA.
+ − 21
+ − 22 In other words, you are welcome to use, share and improve this program.
+ − 23 You are forbidden to forbid anyone else to use, share and improve
+ − 24 what you give them. Help stamp out software-hoarding! */
+ − 25
+ − 26 /* Synched up with: FSF 19.31. */
+ − 27
+ − 28 /*
+ − 29 * unexec.c - Convert a running program into an a.out file.
+ − 30 *
+ − 31 * Author: Spencer W. Thomas
+ − 32 * Computer Science Dept.
+ − 33 * University of Utah
+ − 34 * Date: Tue Mar 2 1982
+ − 35 * Modified heavily since then.
+ − 36 *
+ − 37 * Synopsis:
+ − 38 * unexec (new_name, a_name, data_start, bss_start, entry_address)
+ − 39 * char *new_name, *a_name;
+ − 40 * unsigned data_start, bss_start, entry_address;
+ − 41 *
+ − 42 * Takes a snapshot of the program and makes an a.out format file in the
+ − 43 * file named by the string argument new_name.
+ − 44 * If a_name is non-NULL, the symbol table will be taken from the given file.
+ − 45 * On some machines, an existing a_name file is required.
+ − 46 *
+ − 47 * The boundaries within the a.out file may be adjusted with the data_start
+ − 48 * and bss_start arguments. Either or both may be given as 0 for defaults.
+ − 49 *
+ − 50 * Data_start gives the boundary between the text segment and the data
+ − 51 * segment of the program. The text segment can contain shared, read-only
+ − 52 * program code and literal data, while the data segment is always unshared
+ − 53 * and unprotected. Data_start gives the lowest unprotected address.
+ − 54 * The value you specify may be rounded down to a suitable boundary
+ − 55 * as required by the machine you are using.
+ − 56 *
+ − 57 * Specifying zero for data_start means the boundary between text and data
+ − 58 * should not be the same as when the program was loaded.
+ − 59 * If NO_REMAP is defined, the argument data_start is ignored and the
+ − 60 * segment boundaries are never changed.
+ − 61 *
+ − 62 * Bss_start indicates how much of the data segment is to be saved in the
+ − 63 * a.out file and restored when the program is executed. It gives the lowest
+ − 64 * unsaved address, and is rounded up to a page boundary. The default when 0
+ − 65 * is given assumes that the entire data segment is to be stored, including
+ − 66 * the previous data and bss as well as any additional storage allocated with
+ − 67 * break (2).
+ − 68 *
+ − 69 * The new file is set up to start at entry_address.
+ − 70 *
+ − 71 * If you make improvements I'd like to get them too.
+ − 72 * harpo!utah-cs!thomas, thomas@Utah-20
+ − 73 *
+ − 74 */
+ − 75
+ − 76 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
+ − 77 * ELF support added.
+ − 78 *
+ − 79 * Basic theory: the data space of the running process needs to be
+ − 80 * dumped to the output file. Normally we would just enlarge the size
+ − 81 * of .data, scooting everything down. But we can't do that in ELF,
+ − 82 * because there is often something between the .data space and the
+ − 83 * .bss space.
+ − 84 *
+ − 85 * In the temacs dump below, notice that the Global Offset Table
+ − 86 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
+ − 87 * .bss. It does not work to overlap .data with these fields.
+ − 88 *
+ − 89 * The solution is to create a new .data segment. This segment is
+ − 90 * filled with data from the current process. Since the contents of
+ − 91 * various sections refer to sections by index, the new .data segment
+ − 92 * is made the last in the table to avoid changing any existing index.
+ − 93 */
+ − 94
+ − 95 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
+ − 96 *
+ − 97 * The above mechanism does not work if the unexeced ELF file is being
+ − 98 * re-layout by other applications (such as `strip'). All the applications
+ − 99 * that re-layout the internal of ELF will layout all sections in ascending
+ − 100 * order of their file offsets. After the re-layout, the data2 section will
+ − 101 * still be the LAST section in the section header vector, but its file offset
+ − 102 * is now being pushed far away down, and causes part of it not to be mapped
+ − 103 * in (ie. not covered by the load segment entry in PHDR vector), therefore
+ − 104 * causes the new binary to fail.
+ − 105 *
+ − 106 * The solution is to modify the unexec algorithm to insert the new data2
+ − 107 * section header right before the new bss section header, so their file
+ − 108 * offsets will be in the ascending order. Since some of the section's (all
+ − 109 * sections AFTER the bss section) indexes are now changed, we also need to
+ − 110 * modify some fields to make them point to the right sections. This is done
+ − 111 * by macro PATCH_INDEX. All the fields that need to be patched are:
+ − 112 *
+ − 113 * 1. ELF header e_shstrndx field.
+ − 114 * 2. section header sh_link and sh_info field.
+ − 115 * 3. symbol table entry st_shndx field.
+ − 116 */
+ − 117
+ − 118 /*
+ − 119 * New modifications for Siemens Nixdorf's MIPS-based machines.
+ − 120 * Marco.Walther@mch.sni.de
+ − 121 *
+ − 122 * The problem: Before the bss segment we have a so called sbss segment
+ − 123 * (small bss) and maybe an sdata segment. These segments
+ − 124 * must also be handled correct.
+ − 125 *
+ − 126 * /home1/marco/emacs/emacs-19.22/src
+ − 127 * dump -hv temacs
+ − 128 *
+ − 129 * temacs:
+ − 130 *
+ − 131 * **** SECTION HEADER TABLE ****
+ − 132 * [No] Type Flags Addr Offset Size Name
+ − 133 * Link Info Adralgn Entsize
+ − 134 *
+ − 135 * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
+ − 136 * 0 0 0x1 0
+ − 137 *
+ − 138 * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
+ − 139 * 0 0 0x4 0x18
+ − 140 *
+ − 141 * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
+ − 142 * 6 0 0x4 0x8
+ − 143 *
+ − 144 * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
+ − 145 * 5 0 0x4 0x4
+ − 146 *
+ − 147 * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
+ − 148 * 6 2 0x4 0x10
+ − 149 *
+ − 150 * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
+ − 151 * 0 0 0x1 0
+ − 152 *
+ − 153 * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
+ − 154 * 5 14 0x4 0x8
+ − 155 *
+ − 156 * [8] PBIT -AI- 0x402880 0x2880 0x60 .init
+ − 157 * 0 0 0x10 0x1
+ − 158 *
+ − 159 * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
+ − 160 * 0 0 0x4 0x4
+ − 161 *
+ − 162 * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
+ − 163 * 0 0 0x20 0x1
+ − 164 *
+ − 165 * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
+ − 166 * 0 0 0x10 0x1
+ − 167 *
+ − 168 * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
+ − 169 * 0 0 0x10 0x1
+ − 170 *
+ − 171 * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
+ − 172 * 0 0 0x10 0x1
+ − 173 *
771
+ − 174 * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <----
0
+ − 175 * 0 0 0x10 0x1
+ − 176 *
+ − 177 * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
+ − 178 * 0 0 0x4 0x4
+ − 179 *
771
+ − 180 * [16] PBIT WA-G 0x582360 0x142360 0x10 .sdata <----
0
+ − 181 * 0 0 0x10 0x1
+ − 182 *
771
+ − 183 * [17] NOBI WA-G 0x582370 0x142370 0xb84 .sbss <----
0
+ − 184 * 0 0 0x4 0
+ − 185 *
771
+ − 186 * [18] NOBI WA-- 0x582f00 0x142370 0x27ec0 .bss <----
0
+ − 187 * 0 0 0x10 0x1
+ − 188 *
+ − 189 * [19] SYMT ---- 0 0x142370 0x10e40 .symtab
+ − 190 * 20 1108 0x4 0x10
+ − 191 *
+ − 192 * [20] STRT ---- 0 0x1531b0 0xed9e .strtab
+ − 193 * 0 0 0x1 0
+ − 194 *
+ − 195 * [21] STRT ---- 0 0x161f4e 0xb5 .shstrtab
+ − 196 * 0 0 0x1 0
+ − 197 *
+ − 198 * [22] PBIT ---- 0 0x162003 0x28e2a .comment
+ − 199 * 0 0 0x1 0x1
+ − 200 *
+ − 201 * [23] PBIT ---- 0 0x18ae2d 0x592 .debug
+ − 202 * 0 0 0x1 0
+ − 203 *
+ − 204 * [24] PBIT ---- 0 0x18b3bf 0x80 .line
+ − 205 * 0 0 0x1 0
+ − 206 *
+ − 207 * [25] MDBG ---- 0 0x18b440 0x60 .mdebug
+ − 208 * 0 0 0x4 0
+ − 209 *
+ − 210 *
+ − 211 * dump -hv emacs
+ − 212 *
+ − 213 * emacs:
+ − 214 *
+ − 215 * **** SECTION HEADER TABLE ****
+ − 216 * [No] Type Flags Addr Offset Size Name
+ − 217 * Link Info Adralgn Entsize
+ − 218 *
+ − 219 * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
+ − 220 * 0 0 0x1 0
+ − 221 *
+ − 222 * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
+ − 223 * 0 0 0x4 0x18
+ − 224 *
+ − 225 * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
+ − 226 * 6 0 0x4 0x8
+ − 227 *
+ − 228 * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
+ − 229 * 5 0 0x4 0x4
+ − 230 *
+ − 231 * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
+ − 232 * 6 2 0x4 0x10
+ − 233 *
+ − 234 * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
+ − 235 * 0 0 0x1 0
+ − 236 *
+ − 237 * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
+ − 238 * 5 14 0x4 0x8
+ − 239 *
+ − 240 * [8] PBIT -AI- 0x402880 0x2880 0x60 .init
+ − 241 * 0 0 0x10 0x1
+ − 242 *
+ − 243 * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
+ − 244 * 0 0 0x4 0x4
+ − 245 *
+ − 246 * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
+ − 247 * 0 0 0x20 0x1
+ − 248 *
+ − 249 * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
+ − 250 * 0 0 0x10 0x1
+ − 251 *
+ − 252 * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
+ − 253 * 0 0 0x10 0x1
+ − 254 *
+ − 255 * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
+ − 256 * 0 0 0x10 0x1
+ − 257 *
771
+ − 258 * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <----
0
+ − 259 * 0 0 0x10 0x1
+ − 260 *
+ − 261 * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
+ − 262 * 0 0 0x4 0x4
+ − 263 *
771
+ − 264 * [16] PBIT WA-G 0x582360 0x142360 0xb94 .sdata <----
0
+ − 265 * 0 0 0x10 0x1
+ − 266 *
771
+ − 267 * [17] PBIT WA-- 0x582f00 0x142f00 0x94100 .data <----
0
+ − 268 * 0 0 0x10 0x1
+ − 269 *
771
+ − 270 * [18] NOBI WA-G 0x617000 0x1d7000 0 .sbss <----
0
+ − 271 * 0 0 0x4 0
+ − 272 *
771
+ − 273 * [19] NOBI WA-- 0x617000 0x1d7000 0 .bss <----
0
+ − 274 * 0 0 0x4 0x1
+ − 275 *
+ − 276 * [20] SYMT ---- 0 0x1d7000 0x10e40 .symtab
+ − 277 * 21 1109 0x4 0x10
+ − 278 *
+ − 279 * [21] STRT ---- 0 0x1e7e40 0xed9e .strtab
+ − 280 * 0 0 0x1 0
+ − 281 *
+ − 282 * [22] STRT ---- 0 0x1f6bde 0xb5 .shstrtab
+ − 283 * 0 0 0x1 0
+ − 284 *
+ − 285 * [23] PBIT ---- 0 0x1f6c93 0x28e2a .comment
+ − 286 * 0 0 0x1 0x1
+ − 287 *
+ − 288 * [24] PBIT ---- 0 0x21fabd 0x592 .debug
+ − 289 * 0 0 0x1 0
+ − 290 *
+ − 291 * [25] PBIT ---- 0 0x22004f 0x80 .line
+ − 292 * 0 0 0x1 0
+ − 293 *
+ − 294 * [26] MDBG ---- 0 0x2200d0 0x60 .mdebug
+ − 295 * 0 0 0x4 0
+ − 296 *
+ − 297 */
+ − 298
+ − 299 #include <sys/types.h>
+ − 300 #include <stdio.h>
+ − 301 #include <sys/stat.h>
+ − 302 #include <memory.h>
+ − 303 #include <string.h>
+ − 304 #include <errno.h>
+ − 305 #include <unistd.h>
+ − 306 #include <fcntl.h>
+ − 307 #include <elf.h>
+ − 308 #include <sys/mman.h>
2286
+ − 309 #include "compiler.h"
0
+ − 310
+ − 311 #ifndef emacs
+ − 312 #define fatal(a, b, c) fprintf(stderr, a, b, c), exit(1)
+ − 313 #else
+ − 314 extern void fatal(char *, ...);
+ − 315 #endif
+ − 316
+ − 317 /* Get the address of a particular section or program header entry,
+ − 318 * accounting for the size of the entries.
+ − 319 */
+ − 320
+ − 321 #define OLD_SECTION_H(n) \
+ − 322 (*(Elf32_Shdr *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
+ − 323 #define NEW_SECTION_H(n) \
+ − 324 (*(Elf32_Shdr *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
+ − 325 #define OLD_PROGRAM_H(n) \
+ − 326 (*(Elf32_Phdr *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
+ − 327 #define NEW_PROGRAM_H(n) \
+ − 328 (*(Elf32_Phdr *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
+ − 329
+ − 330 #define PATCH_INDEX(n) \
+ − 331 do { \
+ − 332 if ((n) >= old_sbss_index) \
+ − 333 (n) += 1 + (old_sdata_index ? 0 : 1); } while (0)
+ − 334
+ − 335 typedef unsigned char byte;
+ − 336
+ − 337 /* Round X up to a multiple of Y. */
+ − 338
+ − 339 int
+ − 340 round_up (x, y)
+ − 341 int x, y;
+ − 342 {
+ − 343 int rem = x % y;
+ − 344 if (rem == 0)
+ − 345 return x;
+ − 346 return x - rem + y;
+ − 347 }
+ − 348
+ − 349 /* ****************************************************************
+ − 350 * unexec
+ − 351 *
+ − 352 * driving logic.
+ − 353 *
+ − 354 * In ELF, this works by replacing the old .bss section with a new
+ − 355 * .data section, and inserting an empty .bss immediately afterwards.
+ − 356 *
+ − 357 */
+ − 358 void
+ − 359 unexec (new_name, old_name, data_start, bss_start, entry_address)
+ − 360 char *new_name, *old_name;
2286
+ − 361 unsigned UNUSED (data_start);
+ − 362 unsigned UNUSED (bss_start);
+ − 363 unsigned UNUSED (entry_address);
0
+ − 364 {
+ − 365 extern unsigned int bss_end;
+ − 366 int new_file, old_file, new_file_size;
+ − 367
+ − 368 /* Pointers to the base of the image of the two files. */
+ − 369 caddr_t old_base, new_base;
+ − 370
+ − 371 /* Pointers to the file, program and section headers for the old and new
+ − 372 * files.
+ − 373 */
+ − 374 Elf32_Ehdr *old_file_h, *new_file_h;
+ − 375 Elf32_Phdr *old_program_h, *new_program_h;
+ − 376 Elf32_Shdr *old_section_h, *new_section_h;
+ − 377
+ − 378 /* Point to the section name table in the old file */
+ − 379 char *old_section_names;
+ − 380
+ − 381 Elf32_Addr old_bss_addr, new_bss_addr;
+ − 382 Elf32_Addr old_sbss_addr;
+ − 383 Elf32_Word old_bss_size, new_data2_size;
+ − 384 Elf32_Word old_sbss_size, new_data3_size;
+ − 385 Elf32_Off new_data2_offset;
+ − 386 Elf32_Off new_data3_offset;
+ − 387 Elf32_Addr new_data2_addr;
+ − 388 Elf32_Addr new_data3_addr;
+ − 389
+ − 390 Elf32_Word old_sdata_size, new_sdata_size;
+ − 391 int old_sdata_index = 0;
+ − 392
+ − 393 int n, nn, old_data_index, new_data2_align;
+ − 394 int old_bss_index;
+ − 395 int old_sbss_index;
+ − 396 int old_bss_padding;
+ − 397 struct stat stat_buf;
+ − 398
+ − 399 /* Open the old file & map it into the address space. */
+ − 400
+ − 401 old_file = open (old_name, O_RDONLY);
+ − 402
+ − 403 if (old_file < 0)
+ − 404 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
+ − 405
+ − 406 if (fstat (old_file, &stat_buf) == -1)
+ − 407 fatal ("Can't fstat(%s): errno %d\n", old_name, errno);
+ − 408
+ − 409 old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
+ − 410
+ − 411 if (old_base == (caddr_t) -1)
+ − 412 fatal ("Can't mmap(%s): errno %d\n", old_name, errno);
+ − 413
+ − 414 #ifdef DEBUG
+ − 415 fprintf (stderr, "mmap(%s, %x) -> %x\n", old_name, stat_buf.st_size,
+ − 416 old_base);
+ − 417 #endif
+ − 418
+ − 419 /* Get pointers to headers & section names */
+ − 420
+ − 421 old_file_h = (Elf32_Ehdr *) old_base;
+ − 422 old_program_h = (Elf32_Phdr *) ((byte *) old_base + old_file_h->e_phoff);
+ − 423 old_section_h = (Elf32_Shdr *) ((byte *) old_base + old_file_h->e_shoff);
+ − 424 old_section_names = (char *) old_base
+ − 425 + OLD_SECTION_H(old_file_h->e_shstrndx).sh_offset;
+ − 426
+ − 427 /* Find the old .sbss section.
+ − 428 */
+ − 429
+ − 430 for (old_sbss_index = 1; old_sbss_index < old_file_h->e_shnum;
+ − 431 old_sbss_index++)
+ − 432 {
+ − 433 #ifdef DEBUG
+ − 434 fprintf (stderr, "Looking for .sbss - found %s\n",
+ − 435 old_section_names + OLD_SECTION_H(old_sbss_index).sh_name);
+ − 436 #endif
+ − 437 if (!strcmp (old_section_names + OLD_SECTION_H(old_sbss_index).sh_name,
+ − 438 ".sbss"))
+ − 439 break;
+ − 440 }
+ − 441 if (old_sbss_index == old_file_h->e_shnum)
+ − 442 fatal ("Can't find .sbss in %s.\n", old_name, 0);
+ − 443
+ − 444 if (!strcmp(old_section_names + OLD_SECTION_H(old_sbss_index - 1).sh_name,
+ − 445 ".sdata"))
+ − 446 {
+ − 447 old_sdata_index = old_sbss_index - 1;
+ − 448 }
+ − 449
+ − 450
+ − 451 /* Find the old .bss section.
+ − 452 */
+ − 453
+ − 454 for (old_bss_index = 1; old_bss_index < old_file_h->e_shnum; old_bss_index++)
+ − 455 {
+ − 456 #ifdef DEBUG
+ − 457 fprintf (stderr, "Looking for .bss - found %s\n",
+ − 458 old_section_names + OLD_SECTION_H(old_bss_index).sh_name);
+ − 459 #endif
+ − 460 if (!strcmp (old_section_names + OLD_SECTION_H(old_bss_index).sh_name,
+ − 461 ".bss"))
+ − 462 break;
+ − 463 }
+ − 464 if (old_bss_index == old_file_h->e_shnum)
+ − 465 fatal ("Can't find .bss in %s.\n", old_name, 0);
+ − 466
+ − 467 if (old_sbss_index != (old_bss_index - 1))
+ − 468 fatal (".sbss should come immediately before .bss in %s.\n", old_name, 0);
+ − 469
+ − 470 /* Figure out parameters of the new data3 and data2 sections.
+ − 471 * Change the sbss and bss sections.
+ − 472 */
+ − 473
+ − 474 old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
+ − 475 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
+ − 476
+ − 477 old_sbss_addr = OLD_SECTION_H(old_sbss_index).sh_addr;
+ − 478 old_sbss_size = OLD_SECTION_H(old_sbss_index).sh_size;
+ − 479
+ − 480 if (old_sdata_index)
+ − 481 {
+ − 482 old_sdata_size = OLD_SECTION_H(old_sdata_index).sh_size;
+ − 483 }
+ − 484
+ − 485 #if defined(emacs) || !defined(DEBUG)
+ − 486 bss_end = (unsigned int) sbrk (0);
+ − 487 new_bss_addr = (Elf32_Addr) bss_end;
+ − 488 #else
+ − 489 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
+ − 490 #endif
+ − 491 if (old_sdata_index)
+ − 492 {
+ − 493 new_sdata_size = OLD_SECTION_H(old_sbss_index).sh_offset -
+ − 494 OLD_SECTION_H(old_sdata_index).sh_offset + old_sbss_size;
+ − 495 }
+ − 496
+ − 497 new_data3_addr = old_sbss_addr;
+ − 498 new_data3_size = old_sbss_size;
+ − 499 new_data3_offset = OLD_SECTION_H(old_sbss_index).sh_offset;
+ − 500
+ − 501 new_data2_addr = old_bss_addr;
+ − 502 new_data2_size = new_bss_addr - old_bss_addr;
+ − 503 new_data2_align = (new_data3_offset + old_sbss_size) %
+ − 504 OLD_SECTION_H(old_bss_index).sh_addralign;
+ − 505 new_data2_align = new_data2_align ?
+ − 506 OLD_SECTION_H(old_bss_index).sh_addralign - new_data2_align :
+ − 507 0;
+ − 508 new_data2_offset = new_data3_offset + old_sbss_size + new_data2_align;
+ − 509
+ − 510 old_bss_padding = OLD_SECTION_H(old_bss_index).sh_offset -
+ − 511 OLD_SECTION_H(old_sbss_index).sh_offset;
+ − 512 #ifdef DEBUG
+ − 513 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
+ − 514 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
+ − 515 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
+ − 516 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
+ − 517 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
+ − 518 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
+ − 519 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
+ − 520 fprintf (stderr, "old_sbss_index %d\n", old_sbss_index);
+ − 521 fprintf (stderr, "old_sbss_addr %x\n", old_sbss_addr);
+ − 522 fprintf (stderr, "old_sbss_size %x\n", old_sbss_size);
+ − 523 if (old_sdata_index)
+ − 524 {
+ − 525 fprintf (stderr, "old_sdata_size %x\n", old_sdata_size);
+ − 526 fprintf (stderr, "new_sdata_size %x\n", new_sdata_size);
+ − 527 }
+ − 528 else
+ − 529 {
+ − 530 fprintf (stderr, "new_data3_addr %x\n", new_data3_addr);
+ − 531 fprintf (stderr, "new_data3_size %x\n", new_data3_size);
+ − 532 fprintf (stderr, "new_data3_offset %x\n", new_data3_offset);
+ − 533 }
+ − 534 #endif
+ − 535
+ − 536 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
+ − 537 fatal (".bss shrank when undumping???\n", 0, 0);
+ − 538
+ − 539 /* Set the output file to the right size and mmap(2) it. Set
+ − 540 * pointers to various interesting objects. stat_buf still has
+ − 541 * old_file data.
+ − 542 */
+ − 543
+ − 544 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
+ − 545 if (new_file < 0)
+ − 546 fatal ("Can't creat(%s): errno %d\n", new_name, errno);
+ − 547
+ − 548 new_file_size = stat_buf.st_size +
+ − 549 ((1 + (old_sdata_index ? 0 : 1)) * old_file_h->e_shentsize) +
+ − 550 new_data2_size + new_data3_size + new_data2_align;
+ − 551
+ − 552 if (ftruncate (new_file, new_file_size))
+ − 553 fatal ("Can't ftruncate(%s): errno %d\n", new_name, errno);
+ − 554
+ − 555 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED,
+ − 556 new_file, 0);
+ − 557
+ − 558 if (new_base == (caddr_t) -1)
+ − 559 fatal ("Can't mmap(%s): errno %d\n", new_name, errno);
+ − 560
+ − 561 new_file_h = (Elf32_Ehdr *) new_base;
+ − 562 new_program_h = (Elf32_Phdr *) ((byte *) new_base + old_file_h->e_phoff);
+ − 563 new_section_h = (Elf32_Shdr *) ((byte *) new_base +
+ − 564 old_file_h->e_shoff +
+ − 565 new_data2_size +
+ − 566 new_data2_align +
+ − 567 new_data3_size);
+ − 568
+ − 569 /* Make our new file, program and section headers as copies of the
+ − 570 * originals.
+ − 571 */
+ − 572
+ − 573 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
+ − 574 memcpy (new_program_h, old_program_h,
+ − 575 old_file_h->e_phnum * old_file_h->e_phentsize);
+ − 576
+ − 577 /* Modify the e_shstrndx if necessary. */
+ − 578 PATCH_INDEX (new_file_h->e_shstrndx);
+ − 579
+ − 580 /* Fix up file header. We'll add one section. Section header is
+ − 581 * further away now.
+ − 582 */
+ − 583
+ − 584 new_file_h->e_shoff += new_data2_size + new_data2_align + new_data3_size;
+ − 585 new_file_h->e_shnum += 1 + (old_sdata_index ? 0 : 1);
+ − 586
+ − 587 #ifdef DEBUG
+ − 588 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
+ − 589 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
+ − 590 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
+ − 591 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
+ − 592 #endif
+ − 593
+ − 594 /* Fix up a new program header. Extend the writable data segment so
+ − 595 * that the bss area is covered too. Find that segment by looking
+ − 596 * for a segment that ends just before the .bss area. Make sure
+ − 597 * that no segments are above the new .data2. Put a loop at the end
+ − 598 * to adjust the offset and address of any segment that is above
+ − 599 * data2, just in case we decide to allow this later.
+ − 600 */
+ − 601
+ − 602 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
+ − 603 {
+ − 604 /* Compute maximum of all requirements for alignment of section. */
+ − 605 int alignment = (NEW_PROGRAM_H (n)).p_align;
+ − 606 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
+ − 607 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
+ − 608
+ − 609 if ((OLD_SECTION_H (old_sbss_index)).sh_addralign > alignment)
+ − 610 alignment = OLD_SECTION_H (old_sbss_index).sh_addralign;
+ − 611
+ − 612 /* Supposedly this condition is okay for the SGI. */
+ − 613 #if 0
+ − 614 if (NEW_PROGRAM_H(n).p_vaddr + NEW_PROGRAM_H(n).p_filesz > old_bss_addr)
+ − 615 fatal ("Program segment above .bss in %s\n", old_name, 0);
+ − 616 #endif
+ − 617
+ − 618 if (NEW_PROGRAM_H(n).p_type == PT_LOAD
+ − 619 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
+ − 620 + (NEW_PROGRAM_H (n)).p_filesz,
+ − 621 alignment)
+ − 622 == round_up (old_bss_addr, alignment)))
+ − 623 break;
+ − 624 }
+ − 625 if (n < 0)
+ − 626 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
+ − 627
+ − 628 NEW_PROGRAM_H(n).p_filesz += new_data2_size + new_data2_align +
+ − 629 new_data3_size;
+ − 630 NEW_PROGRAM_H(n).p_memsz = NEW_PROGRAM_H(n).p_filesz;
+ − 631
+ − 632 #if 1 /* Maybe allow section after data2 - does this ever happen? */
+ − 633 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
+ − 634 {
+ − 635 if (NEW_PROGRAM_H(n).p_vaddr
+ − 636 && NEW_PROGRAM_H(n).p_vaddr >= new_data3_addr)
+ − 637 NEW_PROGRAM_H(n).p_vaddr += new_data2_size - old_bss_size +
+ − 638 new_data3_size - old_sbss_size;
+ − 639
+ − 640 if (NEW_PROGRAM_H(n).p_offset >= new_data3_offset)
+ − 641 NEW_PROGRAM_H(n).p_offset += new_data2_size + new_data2_align +
+ − 642 new_data3_size;
+ − 643 }
+ − 644 #endif
+ − 645
+ − 646 /* Fix up section headers based on new .data2 section. Any section
+ − 647 * whose offset or virtual address is after the new .data2 section
+ − 648 * gets its value adjusted. .bss size becomes zero and new address
+ − 649 * is set. data2 section header gets added by copying the existing
+ − 650 * .data header and modifying the offset, address and size.
+ − 651 */
+ − 652 for (old_data_index = 1; old_data_index < old_file_h->e_shnum;
+ − 653 old_data_index++)
+ − 654 if (!strcmp (old_section_names + OLD_SECTION_H(old_data_index).sh_name,
+ − 655 ".data"))
+ − 656 break;
+ − 657 if (old_data_index == old_file_h->e_shnum)
+ − 658 fatal ("Can't find .data in %s.\n", old_name, 0);
+ − 659
+ − 660 /* Walk through all section headers, insert the new data2 section right
+ − 661 before the new bss section. */
+ − 662 for (n = 1, nn = 1; n < old_file_h->e_shnum; n++, nn++)
+ − 663 {
+ − 664 caddr_t src;
+ − 665
+ − 666 if (n == old_sbss_index)
+ − 667
+ − 668 /* If it is sbss section, insert the new data3 section before it. */
+ − 669 {
+ − 670 /* Steal the data section header for this data3 section. */
+ − 671 if (!old_sdata_index)
+ − 672 {
+ − 673 memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index),
+ − 674 new_file_h->e_shentsize);
+ − 675
+ − 676 NEW_SECTION_H(nn).sh_addr = new_data3_addr;
+ − 677 NEW_SECTION_H(nn).sh_offset = new_data3_offset;
+ − 678 NEW_SECTION_H(nn).sh_size = new_data3_size;
+ − 679 NEW_SECTION_H(nn).sh_flags = OLD_SECTION_H(n).sh_flags;
+ − 680 /* Use the sbss section's alignment. This will assure that the
+ − 681 new data3 section always be placed in the same spot as the old
+ − 682 sbss section by any other application. */
+ − 683 NEW_SECTION_H(nn).sh_addralign = OLD_SECTION_H(n).sh_addralign;
+ − 684
+ − 685 /* Now copy over what we have in the memory now. */
+ − 686 memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
+ − 687 (caddr_t) OLD_SECTION_H(n).sh_addr,
+ − 688 new_data3_size);
+ − 689 /* the new .data2 section should also come before the
+ − 690 * new .sbss section */
+ − 691 nn += 2;
+ − 692 }
+ − 693 else
+ − 694 {
+ − 695 /* We always have a .sdata section: append the contents of the
+ − 696 * old .sbss section.
+ − 697 */
+ − 698 memcpy (new_data3_offset + new_base,
+ − 699 (caddr_t) OLD_SECTION_H(n).sh_addr,
+ − 700 new_data3_size);
+ − 701 nn ++;
+ − 702 }
+ − 703 }
+ − 704 else if (n == old_bss_index)
+ − 705
+ − 706 /* If it is bss section, insert the new data2 section before it. */
+ − 707 {
+ − 708 Elf32_Word tmp_align;
+ − 709 Elf32_Addr tmp_addr;
+ − 710
+ − 711 tmp_align = OLD_SECTION_H(n).sh_addralign;
+ − 712 tmp_addr = OLD_SECTION_H(n).sh_addr;
+ − 713
+ − 714 nn -= 2;
+ − 715 /* Steal the data section header for this data2 section. */
+ − 716 memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index),
+ − 717 new_file_h->e_shentsize);
+ − 718
+ − 719 NEW_SECTION_H(nn).sh_addr = new_data2_addr;
+ − 720 NEW_SECTION_H(nn).sh_offset = new_data2_offset;
+ − 721 NEW_SECTION_H(nn).sh_size = new_data2_size;
+ − 722 /* Use the bss section's alignment. This will assure that the
+ − 723 new data2 section always be placed in the same spot as the old
+ − 724 bss section by any other application. */
+ − 725 NEW_SECTION_H(nn).sh_addralign = tmp_align;
+ − 726
+ − 727 /* Now copy over what we have in the memory now. */
+ − 728 memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
+ − 729 (caddr_t) tmp_addr, new_data2_size);
+ − 730 nn += 2;
+ − 731 }
+ − 732
+ − 733 memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(n),
+ − 734 old_file_h->e_shentsize);
+ − 735
+ − 736 if (old_sdata_index && n == old_sdata_index)
+ − 737 /* The old .sdata section has now a new size */
+ − 738 NEW_SECTION_H(nn).sh_size = new_sdata_size;
+ − 739
+ − 740 /* The new bss section's size is zero, and its file offset and virtual
+ − 741 address should be off by NEW_DATA2_SIZE. */
+ − 742 if (n == old_sbss_index)
+ − 743 {
+ − 744 /* NN should be `old_sbss_index + 2' at this point. */
+ − 745 NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align +
+ − 746 new_data3_size;
+ − 747 NEW_SECTION_H(nn).sh_addr += new_data2_size + new_data2_align +
+ − 748 new_data3_size;
+ − 749 /* Let the new bss section address alignment be the same as the
+ − 750 section address alignment followed the old bss section, so
+ − 751 this section will be placed in exactly the same place. */
+ − 752 NEW_SECTION_H(nn).sh_addralign =
+ − 753 OLD_SECTION_H(nn + (old_sdata_index ? 1 : 0)).sh_addralign;
+ − 754 NEW_SECTION_H(nn).sh_size = 0;
+ − 755 }
+ − 756 else if (n == old_bss_index)
+ − 757 {
+ − 758 /* NN should be `old_bss_index + 2' at this point. */
+ − 759 NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align +
+ − 760 new_data3_size - old_bss_padding;
+ − 761 NEW_SECTION_H(nn).sh_addr += new_data2_size;
+ − 762 /* Let the new bss section address alignment be the same as the
+ − 763 section address alignment followed the old bss section, so
+ − 764 this section will be placed in exactly the same place. */
+ − 765 NEW_SECTION_H(nn).sh_addralign =
+ − 766 OLD_SECTION_H((nn - (old_sdata_index ? 0 : 1))).sh_addralign;
+ − 767 NEW_SECTION_H(nn).sh_size = 0;
+ − 768 }
+ − 769 /* Any section that was original placed AFTER the bss section should now
+ − 770 be off by NEW_DATA2_SIZE. */
+ − 771 else if (NEW_SECTION_H(nn).sh_offset >= new_data3_offset)
+ − 772 NEW_SECTION_H(nn).sh_offset += new_data2_size +
+ − 773 new_data2_align +
+ − 774 new_data3_size -
+ − 775 old_bss_padding;
+ − 776
+ − 777 /* If any section hdr refers to the section after the new .data
+ − 778 section, make it refer to next one because we have inserted
+ − 779 a new section in between. */
+ − 780
+ − 781 PATCH_INDEX(NEW_SECTION_H(nn).sh_link);
+ − 782 PATCH_INDEX(NEW_SECTION_H(nn).sh_info);
+ − 783
+ − 784 /* Now, start to copy the content of sections. */
+ − 785 if (NEW_SECTION_H(nn).sh_type == SHT_NULL
+ − 786 || NEW_SECTION_H(nn).sh_type == SHT_NOBITS)
+ − 787 continue;
+ − 788
+ − 789 /* Write out the sections. .data, .data1 and .sdata get copied from
+ − 790 * the current process instead of the old file.
+ − 791 */
+ − 792 if (!strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data") ||
+ − 793 !strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data1") ||
+ − 794 (old_sdata_index && (n == old_sdata_index)))
+ − 795 src = (caddr_t) OLD_SECTION_H(n).sh_addr;
+ − 796 else
+ − 797 src = old_base + OLD_SECTION_H(n).sh_offset;
+ − 798
+ − 799 memcpy (NEW_SECTION_H(nn).sh_offset + new_base, src,
+ − 800 ((n == old_sdata_index) ?
+ − 801 old_sdata_size :
+ − 802 NEW_SECTION_H(nn).sh_size));
+ − 803
+ − 804 /* If it is the symbol table, its st_shndx field needs to be patched. */
+ − 805 if (NEW_SECTION_H(nn).sh_type == SHT_SYMTAB
+ − 806 || NEW_SECTION_H(nn).sh_type == SHT_DYNSYM)
+ − 807 {
+ − 808 Elf32_Shdr *spt = &NEW_SECTION_H(nn);
+ − 809 unsigned int num = spt->sh_size / spt->sh_entsize;
+ − 810 Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H(nn).sh_offset +
+ − 811 new_base);
+ − 812 for (; num--; sym++)
+ − 813 {
+ − 814 if ((sym->st_shndx == SHN_UNDEF)
+ − 815 || (sym->st_shndx == SHN_ABS)
+ − 816 || (sym->st_shndx == SHN_COMMON))
+ − 817 continue;
+ − 818
+ − 819 PATCH_INDEX(sym->st_shndx);
+ − 820 }
+ − 821 }
+ − 822 }
+ − 823
+ − 824 /* Close the files and make the new file executable */
+ − 825
+ − 826 if (close (old_file))
+ − 827 fatal ("Can't close(%s): errno %d\n", old_name, errno);
+ − 828
+ − 829 if (close (new_file))
+ − 830 fatal ("Can't close(%s): errno %d\n", new_name, errno);
+ − 831
+ − 832 if (stat (new_name, &stat_buf) == -1)
+ − 833 fatal ("Can't stat(%s): errno %d\n", new_name, errno);
+ − 834
+ − 835 n = umask (777);
+ − 836 umask (n);
+ − 837 stat_buf.st_mode |= 0111 & ~n;
+ − 838 if (chmod (new_name, stat_buf.st_mode) == -1)
+ − 839 fatal ("Can't chmod(%s): errno %d\n", new_name, errno);
+ − 840 }
