1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993
2 Free Software Foundation, Inc.
4 This file is part of XEmacs.
6 XEmacs is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with XEmacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* Synched up with: FSF 20.2. */
24 * unexec.c - Convert a running program into an a.out file.
26 * Author: Spencer W. Thomas
27 * Computer Science Dept.
29 * Date: Tue Mar 2 1982
30 * Modified heavily since then.
33 * unexec (new_name, a_name, data_start, bss_start, entry_address)
34 * char *new_name, *a_name;
35 * unsigned data_start, bss_start, entry_address;
37 * Takes a snapshot of the program and makes an a.out format file in the
38 * file named by the string argument new_name.
39 * If a_name is non-NULL, the symbol table will be taken from the given file.
40 * On some machines, an existing a_name file is required.
42 * The boundaries within the a.out file may be adjusted with the data_start
43 * and bss_start arguments. Either or both may be given as 0 for defaults.
45 * Data_start gives the boundary between the text segment and the data
46 * segment of the program. The text segment can contain shared, read-only
47 * program code and literal data, while the data segment is always unshared
48 * and unprotected. Data_start gives the lowest unprotected address.
49 * The value you specify may be rounded down to a suitable boundary
50 * as required by the machine you are using.
52 * Specifying zero for data_start means the boundary between text and data
53 * should not be the same as when the program was loaded.
54 * If NO_REMAP is defined, the argument data_start is ignored and the
55 * segment boundaries are never changed.
57 * Bss_start indicates how much of the data segment is to be saved in the
58 * a.out file and restored when the program is executed. It gives the lowest
59 * unsaved address, and is rounded up to a page boundary. The default when 0
60 * is given assumes that the entire data segment is to be stored, including
61 * the previous data and bss as well as any additional storage allocated with
64 * The new file is set up to start at entry_address.
66 * If you make improvements I'd like to get them too.
67 * harpo!utah-cs!thomas, thomas@Utah-20
71 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
74 * Basic theory: the data space of the running process needs to be
75 * dumped to the output file. Normally we would just enlarge the size
76 * of .data, scooting everything down. But we can't do that in ELF,
77 * because there is often something between the .data space and the
80 * In the temacs dump below, notice that the Global Offset Table
81 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
82 * .bss. It does not work to overlap .data with these fields.
84 * The solution is to create a new .data segment. This segment is
85 * filled with data from the current process. Since the contents of
86 * various sections refer to sections by index, the new .data segment
87 * is made the last in the table to avoid changing any existing index.
89 * This is an example of how the section headers are changed. "Addr"
90 * is a process virtual address. "Offset" is a file offset.
92 raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
96 **** SECTION HEADER TABLE ****
97 [No] Type Flags Addr Offset Size Name
98 Link Info Adralgn Entsize
100 [1] 1 2 0x80480d4 0xd4 0x13 .interp
103 [2] 5 2 0x80480e8 0xe8 0x388 .hash
106 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
109 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
112 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
115 [6] 1 6 0x8049348 0x1348 0x3 .init
118 [7] 1 6 0x804934c 0x134c 0x680 .plt
121 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
124 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
127 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
130 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
133 [12] 1 3 0x8088330 0x3f330 0x20afc .data
136 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
139 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
142 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
145 [16] 8 3 0x80a98f4 0x608f4 0x449c .bss
148 [17] 2 0 0 0x608f4 0x9b90 .symtab
151 [18] 3 0 0 0x6a484 0x8526 .strtab
154 [19] 3 0 0 0x729aa 0x93 .shstrtab
157 [20] 1 0 0 0x72a3d 0x68b7 .comment
160 raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
164 **** SECTION HEADER TABLE ****
165 [No] Type Flags Addr Offset Size Name
166 Link Info Adralgn Entsize
168 [1] 1 2 0x80480d4 0xd4 0x13 .interp
171 [2] 5 2 0x80480e8 0xe8 0x388 .hash
174 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
177 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
180 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
183 [6] 1 6 0x8049348 0x1348 0x3 .init
186 [7] 1 6 0x804934c 0x134c 0x680 .plt
189 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
192 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
195 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
198 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
201 [12] 1 3 0x8088330 0x3f330 0x20afc .data
204 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
207 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
210 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
213 [16] 8 3 0x80c6800 0x7d800 0 .bss
216 [17] 2 0 0 0x7d800 0x9b90 .symtab
219 [18] 3 0 0 0x87390 0x8526 .strtab
222 [19] 3 0 0 0x8f8b6 0x93 .shstrtab
225 [20] 1 0 0 0x8f949 0x68b7 .comment
228 [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
231 * This is an example of how the file header is changed. "Shoff" is
232 * the section header offset within the file. Since that table is
233 * after the new .data section, it is moved. "Shnum" is the number of
234 * sections, which we increment.
236 * "Phoff" is the file offset to the program header. "Phentsize" and
237 * "Shentsz" are the program and section header entries sizes respectively.
238 * These can be larger than the apparent struct sizes.
240 raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
245 Class Data Type Machine Version
246 Entry Phoff Shoff Flags Ehsize
247 Phentsize Phnum Shentsz Shnum Shstrndx
250 0x80499cc 0x34 0x792f4 0 0x34
253 raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
258 Class Data Type Machine Version
259 Entry Phoff Shoff Flags Ehsize
260 Phentsize Phnum Shentsz Shnum Shstrndx
263 0x80499cc 0x34 0x96200 0 0x34
266 * These are the program headers. "Offset" is the file offset to the
267 * segment. "Vaddr" is the memory load address. "Filesz" is the
268 * segment size as it appears in the file, and "Memsz" is the size in
269 * memory. Below, the third segment is the code and the fourth is the
270 * data: the difference between Filesz and Memsz is .bss
272 raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
275 ***** PROGRAM EXECUTION HEADER *****
276 Type Offset Vaddr Paddr
277 Filesz Memsz Flags Align
286 0x3f2f9 0x3f2f9 5 0x1000
288 1 0x3f330 0x8088330 0
289 0x215c4 0x25a60 7 0x1000
291 2 0x60874 0x80a9874 0
294 raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
297 ***** PROGRAM EXECUTION HEADER *****
298 Type Offset Vaddr Paddr
299 Filesz Memsz Flags Align
308 0x3f2f9 0x3f2f9 5 0x1000
310 1 0x3f330 0x8088330 0
311 0x3e4d0 0x3e4d0 7 0x1000
313 2 0x60874 0x80a9874 0
319 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
321 * The above mechanism does not work if the unexeced ELF file is being
322 * re-layout by other applications (such as `strip'). All the applications
323 * that re-layout the internal of ELF will layout all sections in ascending
324 * order of their file offsets. After the re-layout, the data2 section will
325 * still be the LAST section in the section header vector, but its file offset
326 * is now being pushed far away down, and causes part of it not to be mapped
327 * in (ie. not covered by the load segment entry in PHDR vector), therefore
328 * causes the new binary to fail.
330 * The solution is to modify the unexec algorithm to insert the new data2
331 * section header right before the new bss section header, so their file
332 * offsets will be in the ascending order. Since some of the section's (all
333 * sections AFTER the bss section) indexes are now changed, we also need to
334 * modify some fields to make them point to the right sections. This is done
335 * by macro PATCH_INDEX. All the fields that need to be patched are:
337 * 1. ELF header e_shstrndx field.
338 * 2. section header sh_link and sh_info field.
339 * 3. symbol table entry st_shndx field.
341 * The above example now should look like:
343 **** SECTION HEADER TABLE ****
344 [No] Type Flags Addr Offset Size Name
345 Link Info Adralgn Entsize
347 [1] 1 2 0x80480d4 0xd4 0x13 .interp
350 [2] 5 2 0x80480e8 0xe8 0x388 .hash
353 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
356 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
359 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
362 [6] 1 6 0x8049348 0x1348 0x3 .init
365 [7] 1 6 0x804934c 0x134c 0x680 .plt
368 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
371 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
374 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
377 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
380 [12] 1 3 0x8088330 0x3f330 0x20afc .data
383 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
386 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
389 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
392 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
395 [17] 8 3 0x80c6800 0x7d800 0 .bss
398 [18] 2 0 0 0x7d800 0x9b90 .symtab
401 [19] 3 0 0 0x87390 0x8526 .strtab
404 [20] 3 0 0 0x8f8b6 0x93 .shstrtab
407 [21] 1 0 0 0x8f949 0x68b7 .comment
413 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
416 extern void fatal (CONST char *, ...);
419 #include <sys/types.h>
421 #include <sys/stat.h>
428 #include <sys/mman.h>
430 #if __GLIBC__ - 0 >= 2
431 # include <link.h> /* get ElfW etc */
436 # define ElfW(type) Elf32_##type
438 # define ElfW(type) Elf32_/**/type
442 #ifndef ELF_BSS_SECTION_NAME
443 #define ELF_BSS_SECTION_NAME ".bss"
446 /* Get the address of a particular section or program header entry,
447 * accounting for the size of the entries.
450 On PPC Reference Platform running Solaris 2.5.1
451 the plt section is also of type NOBI like the bss section.
452 (not really stored) and therefore sections after the bss
453 section start at the plt offset. The plt section is always
454 the one just before the bss section.
455 Thus, we modify the test from
456 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
458 if (NEW_SECTION_H (nn).sh_offset >=
459 OLD_SECTION_H (old_bss_index-1).sh_offset)
460 This is just a hack. We should put the new data section
461 before the .plt section.
462 And we should not have this routine at all but use
463 the libelf library to read the old file and create the new
465 The changed code is minimal and depends on prep set in m/prep.h
467 Quantum Theory Project
468 University of Florida
473 #define OLD_SECTION_H(n) \
474 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
475 #define NEW_SECTION_H(n) \
476 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
477 #define OLD_PROGRAM_H(n) \
478 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
479 #define NEW_PROGRAM_H(n) \
480 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
482 #define PATCH_INDEX(n) \
484 if ((int) (n) >= old_bss_index) \
486 typedef unsigned char byte;
488 /* Round X up to a multiple of Y. */
491 round_up (int x, int y)
499 /* ****************************************************************
504 * In ELF, this works by replacing the old .bss section with a new
505 * .data section, and inserting an empty .bss immediately afterwards.
508 void unexec (char *new_name, char *old_name, unsigned int data_start,
509 unsigned int bss_start, unsigned int entry_address);
511 unexec (char *new_name, char *old_name, unsigned int data_start,
512 unsigned int bss_start, unsigned int entry_address)
514 int new_file, old_file, new_file_size;
516 /* Pointers to the base of the image of the two files. */
517 caddr_t old_base, new_base;
519 /* Pointers to the file, program and section headers for the old and new
522 ElfW(Ehdr) *old_file_h, *new_file_h;
523 ElfW(Phdr) *old_program_h, *new_program_h;
524 ElfW(Shdr) *old_section_h, *new_section_h;
526 /* Point to the section name table in the old file */
527 char *old_section_names;
529 ElfW(Addr) old_bss_addr, new_bss_addr;
530 ElfW(Word) old_bss_size, new_data2_size;
531 ElfW(Off) new_data2_offset;
532 ElfW(Addr) new_data2_addr;
534 int n, nn, old_bss_index, old_data_index;
535 struct stat stat_buf;
537 /* Open the old file & map it into the address space. */
539 old_file = open (old_name, O_RDONLY);
542 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
544 if (fstat (old_file, &stat_buf) == -1)
545 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
547 old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
549 if (old_base == (caddr_t) -1)
550 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
553 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
557 /* Get pointers to headers & section names */
559 old_file_h = (ElfW(Ehdr) *) old_base;
560 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
561 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
562 old_section_names = (char *) old_base
563 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
565 /* Find the old .bss section. Figure out parameters of the new
566 * data2 and bss sections.
569 for (old_bss_index = 1; old_bss_index < (int) old_file_h->e_shnum;
573 fprintf (stderr, "Looking for .bss - found %s\n",
574 old_section_names + OLD_SECTION_H (old_bss_index).sh_name);
576 if (!strcmp (old_section_names + OLD_SECTION_H (old_bss_index).sh_name,
577 ELF_BSS_SECTION_NAME))
580 if (old_bss_index == old_file_h->e_shnum)
581 fatal ("Can't find .bss in %s.\n", old_name, 0);
583 old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
584 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
585 #if defined (emacs) || !defined (DEBUG)
586 new_bss_addr = (ElfW(Addr)) sbrk (0);
588 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
590 new_data2_addr = old_bss_addr;
591 new_data2_size = new_bss_addr - old_bss_addr;
592 new_data2_offset = OLD_SECTION_H (old_bss_index).sh_offset;
595 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
596 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
597 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
598 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
599 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
600 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
601 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
604 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
605 fatal (".bss shrank when undumping???\n", 0, 0);
607 /* Set the output file to the right size and mmap it. Set
608 * pointers to various interesting objects. stat_buf still has
612 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
614 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
616 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
618 if (ftruncate (new_file, new_file_size))
619 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
621 #ifdef UNEXEC_USE_MAP_PRIVATE
622 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_PRIVATE,
625 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED,
629 if (new_base == (caddr_t) -1)
630 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
632 new_file_h = (ElfW(Ehdr) *) new_base;
633 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
634 new_section_h = (ElfW(Shdr) *)
635 ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
637 /* Make our new file, program and section headers as copies of the
641 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
642 memcpy (new_program_h, old_program_h,
643 old_file_h->e_phnum * old_file_h->e_phentsize);
645 /* Modify the e_shstrndx if necessary. */
646 PATCH_INDEX (new_file_h->e_shstrndx);
648 /* Fix up file header. We'll add one section. Section header is
652 new_file_h->e_shoff += new_data2_size;
653 new_file_h->e_shnum += 1;
656 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
657 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
658 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
659 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
662 /* Fix up a new program header. Extend the writable data segment so
663 * that the bss area is covered too. Find that segment by looking
664 * for a segment that ends just before the .bss area. Make sure
665 * that no segments are above the new .data2. Put a loop at the end
666 * to adjust the offset and address of any segment that is above
667 * data2, just in case we decide to allow this later.
670 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
672 /* Compute maximum of all requirements for alignment of section. */
673 ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align;
674 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
675 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
677 #ifndef __mips /* ifndef added by jwz at suggestion of
678 r02kar@x4u2.desy.de (Karsten Kuenne) to avoid
679 "Program segment above .bss" when dumping.
681 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz > old_bss_addr)
682 fatal ("Program segment above .bss in %s\n", old_name, 0);
685 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
686 && (round_up ((int) ((NEW_PROGRAM_H (n)).p_vaddr
687 + (NEW_PROGRAM_H (n)).p_filesz),
689 == round_up ((int) old_bss_addr, alignment)))
693 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
695 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
696 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
698 #if 0 /* Maybe allow section after data2 - does this ever happen? */
699 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
701 if (NEW_PROGRAM_H (n).p_vaddr
702 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
703 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
705 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
706 NEW_PROGRAM_H (n).p_offset += new_data2_size;
710 /* Fix up section headers based on new .data2 section. Any section
711 * whose offset or virtual address is after the new .data2 section
712 * gets its value adjusted. .bss size becomes zero and new address
713 * is set. data2 section header gets added by copying the existing
714 * .data header and modifying the offset, address and size.
716 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
718 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
721 if (old_data_index == old_file_h->e_shnum)
722 fatal ("Can't find .data in %s.\n", old_name, 0);
724 /* Walk through all section headers, insert the new data2 section right
725 before the new bss section. */
726 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
729 /* If it is bss section, insert the new data2 section before it. */
730 if (n == old_bss_index)
732 /* Steal the data section header for this data2 section. */
733 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
734 new_file_h->e_shentsize);
736 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
737 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
738 NEW_SECTION_H (nn).sh_size = new_data2_size;
739 /* Use the bss section's alignment. This will assure that the
740 new data2 section always be placed in the same spot as the old
741 bss section by any other application. */
742 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
744 /* Now copy over what we have in the memory now. */
745 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
746 (caddr_t) OLD_SECTION_H (n).sh_addr,
747 /* #### mrb: should be old_bss_size instead? */
752 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
753 old_file_h->e_shentsize);
755 /* The new bss section's size is zero, and its file offset and virtual
756 address should be off by NEW_DATA2_SIZE. */
757 if (n == old_bss_index)
759 /* NN should be `old_bss_index + 1' at this point. */
760 NEW_SECTION_H (nn).sh_offset += new_data2_size;
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 = OLD_SECTION_H (nn).sh_addralign;
766 NEW_SECTION_H (nn).sh_size = 0;
770 /* Any section that was original placed AFTER the bss
771 section should now be off by NEW_DATA2_SIZE. */
772 #ifdef SOLARIS_POWERPC
773 /* On PPC Reference Platform running Solaris 2.5.1
774 the plt section is also of type NOBI like the bss section.
775 (not really stored) and therefore sections after the bss
776 section start at the plt offset. The plt section is always
777 the one just before the bss section.
778 It would be better to put the new data section before
779 the .plt section, or use libelf instead.
780 Erik Deumens, deumens@qtp.ufl.edu. */
781 if (NEW_SECTION_H (nn).sh_offset
782 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
783 NEW_SECTION_H (nn).sh_offset += new_data2_size;
785 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
786 NEW_SECTION_H (nn).sh_offset += new_data2_size;
788 /* Any section that was originally placed after the section
789 header table should now be off by the size of one section
790 header table entry. */
791 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
792 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
795 /* If any section hdr refers to the section after the new .data
796 section, make it refer to next one because we have inserted
797 a new section in between. */
799 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
800 /* For symbol tables, info is a symbol table index,
801 so don't change it. */
802 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
803 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
804 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
806 /* Now, start to copy the content of sections. */
807 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
808 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
811 /* Write out the sections. .data and .data1 (and data2, called
812 ".data" in the strings table) get copied from the current process
813 instead of the old file. */
815 /* The PowerPC has additional 'data' segments which need to be saved */
816 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data") ||
817 !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data1") ||
818 !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".sdata") ||
819 !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".sdata1"))
821 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
822 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
825 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
827 src = old_base + OLD_SECTION_H (n).sh_offset;
829 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
830 NEW_SECTION_H (nn).sh_size);
832 /* If it is the symbol table, its st_shndx field needs to be patched. */
833 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
834 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
836 ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
837 unsigned int num = spt->sh_size / spt->sh_entsize;
838 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
842 if ((sym->st_shndx == SHN_UNDEF)
843 || (sym->st_shndx == SHN_ABS)
844 || (sym->st_shndx == SHN_COMMON))
847 PATCH_INDEX (sym->st_shndx);
852 /* Update the symbol values of _edata and _end. */
853 for (n = new_file_h->e_shnum - 1; n; n--)
856 ElfW(Sym) *symp, *symendp;
858 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
859 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
862 symnames = ((byte *) new_base
863 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
864 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
865 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
867 for (; symp < symendp; symp ++)
868 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
869 || strcmp ((char *) (symnames + symp->st_name), "end") == 0
870 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
871 || strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
872 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
875 /* This loop seeks out relocation sections for the data section, so
876 that it can undo relocations performed by the runtime linker. */
877 for (n = new_file_h->e_shnum - 1; n; n--)
879 ElfW(Shdr) section = NEW_SECTION_H (n);
880 switch (section.sh_type) {
885 /* This code handles two different size structs, but there should
886 be no harm in that provided that r_offset is always the first
888 nn = section.sh_info;
890 /* The PowerPC has additional 'data' segments which need to be saved */
891 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data") ||
892 !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data1") ||
893 !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".sdata") ||
894 !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".sdata1"))
896 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
897 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
901 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr -
902 NEW_SECTION_H (nn).sh_offset;
903 caddr_t reloc = old_base + section.sh_offset, end;
904 for (end = reloc + section.sh_size; reloc < end;
905 reloc += section.sh_entsize)
907 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
908 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
915 #ifdef UNEXEC_USE_MAP_PRIVATE
916 if (lseek (new_file, 0, SEEK_SET) == -1)
917 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
919 if (write (new_file, new_base, new_file_size) != new_file_size)
920 fatal ("Can't write (%s): errno %d\n", new_name, errno);
923 /* Close the files and make the new file executable. */
925 if (close (old_file))
926 fatal ("Can't close (%s): errno %d\n", old_name, errno);
928 if (close (new_file))
929 fatal ("Can't close (%s): errno %d\n", new_name, errno);
931 if (stat (new_name, &stat_buf) == -1)
932 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
936 stat_buf.st_mode |= 0111 & ~n;
937 if (chmod (new_name, stat_buf.st_mode) == -1)
938 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);