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 20.4. */
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>
430 #include <sys/mman.h>
431 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
432 #include <sys/elf_mips.h>
434 #endif /* __sony_news && _SYSTYPE_SYSV */
436 #include <sym.h> /* for HDRR declaration */
439 #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__)
440 /* Declare COFF debugging symbol table. This used to be in
441 /usr/include/sym.h, but this file is no longer included in Red Hat
442 5.0 and presumably in any other glibc 2.x based distribution. */
470 #define cbHDRR sizeof(HDRR)
471 #define hdrNil ((pHDRR)0)
475 # include <sys/exec_elf.h>
478 #if __GNU_LIBRARY__ - 0 >= 6
479 # include <link.h> /* get ElfW etc */
484 # define ElfW(type) Elf32_##type
486 # define ElfW(type) Elf32_/**/type
490 #ifndef ELF_BSS_SECTION_NAME
491 #define ELF_BSS_SECTION_NAME ".bss"
494 /* Get the address of a particular section or program header entry,
495 * accounting for the size of the entries.
498 On PPC Reference Platform running Solaris 2.5.1
499 the plt section is also of type NOBI like the bss section.
500 (not really stored) and therefore sections after the bss
501 section start at the plt offset. The plt section is always
502 the one just before the bss section.
503 Thus, we modify the test from
504 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
506 if (NEW_SECTION_H (nn).sh_offset >=
507 OLD_SECTION_H (old_bss_index-1).sh_offset)
508 This is just a hack. We should put the new data section
509 before the .plt section.
510 And we should not have this routine at all but use
511 the libelf library to read the old file and create the new
513 The changed code is minimal and depends on prep set in m/prep.h
515 Quantum Theory Project
516 University of Florida
521 #define OLD_SECTION_H(n) \
522 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
523 #define NEW_SECTION_H(n) \
524 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
525 #define OLD_PROGRAM_H(n) \
526 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
527 #define NEW_PROGRAM_H(n) \
528 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
530 #define PATCH_INDEX(n) \
532 if ((int) (n) >= old_bss_index) \
534 typedef unsigned char byte;
536 /* Round X up to a multiple of Y. */
539 round_up (ElfW(Addr) x, ElfW(Addr) y)
547 /* ****************************************************************
552 * In ELF, this works by replacing the old .bss section with a new
553 * .data section, and inserting an empty .bss immediately afterwards.
556 void unexec (char *new_name, char *old_name, unsigned int data_start,
557 unsigned int bss_start, unsigned int entry_address);
559 unexec (char *new_name, char *old_name, unsigned int data_start,
560 unsigned int bss_start, unsigned int entry_address)
562 int new_file, old_file, new_file_size;
564 /* Pointers to the base of the image of the two files. */
565 caddr_t old_base, new_base;
567 /* Pointers to the file, program and section headers for the old and new
570 ElfW(Ehdr) *old_file_h, *new_file_h;
571 ElfW(Phdr) *old_program_h, *new_program_h;
572 ElfW(Shdr) *old_section_h, *new_section_h;
574 /* Point to the section name table in the old file */
575 char *old_section_names;
577 ElfW(Addr) old_bss_addr, new_bss_addr;
578 ElfW(Word) old_bss_size, new_data2_size;
579 ElfW(Off) new_data2_offset;
580 ElfW(Addr) new_data2_addr;
582 int n, nn, old_bss_index, old_data_index, new_data2_index;
583 int old_sbss_index, old_mdebug_index;
584 struct stat stat_buf;
586 /* Open the old file & map it into the address space. */
588 old_file = open (old_name, O_RDONLY);
591 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
593 if (fstat (old_file, &stat_buf) == -1)
594 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
596 old_base = (caddr_t) mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
598 if (old_base == (caddr_t) -1)
599 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
602 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
606 /* Get pointers to headers & section names */
608 old_file_h = (ElfW(Ehdr) *) old_base;
609 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
610 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
611 old_section_names = (char *) old_base
612 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
614 /* Find the old .bss section. Figure out parameters of the new
615 * data2 and bss sections.
618 for (old_bss_index = 1; old_bss_index < (int) old_file_h->e_shnum;
622 fprintf (stderr, "Looking for .bss - found %s\n",
623 old_section_names + OLD_SECTION_H (old_bss_index).sh_name);
625 if (!strcmp (old_section_names + OLD_SECTION_H (old_bss_index).sh_name,
626 ELF_BSS_SECTION_NAME))
629 if (old_bss_index == old_file_h->e_shnum)
630 fatal ("Can't find .bss in %s.\n", old_name, 0);
632 for (old_sbss_index = 1; old_sbss_index < (int) old_file_h->e_shnum;
636 fprintf (stderr, "Looking for .sbss - found %s\n",
637 old_section_names + OLD_SECTION_H (old_sbss_index).sh_name);
639 if (!strcmp (old_section_names + OLD_SECTION_H (old_sbss_index).sh_name,
643 if (old_sbss_index == old_file_h->e_shnum)
646 old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
647 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
648 new_data2_index = old_bss_index;
652 old_bss_addr = OLD_SECTION_H(old_sbss_index).sh_addr;
653 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size
654 + OLD_SECTION_H(old_sbss_index).sh_size;
655 new_data2_index = old_sbss_index;
658 for (old_mdebug_index = 1; old_mdebug_index < (int) old_file_h->e_shnum;
662 fprintf (stderr, "Looking for .mdebug - found %s\n",
663 old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name);
665 if (!strcmp (old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name,
669 if (old_mdebug_index == old_file_h->e_shnum)
670 old_mdebug_index = 0;
672 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
676 fprintf (stderr, "Looking for .data - found %s\n",
677 old_section_names + OLD_SECTION_H (old_data_index).sh_name);
679 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
683 if (old_data_index == old_file_h->e_shnum)
686 #if defined (emacs) || !defined (DEBUG)
687 new_bss_addr = (ElfW(Addr)) sbrk (0);
689 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
691 new_data2_addr = old_bss_addr;
692 new_data2_size = new_bss_addr - old_bss_addr;
693 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
694 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
697 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
698 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
699 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
700 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
701 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
702 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
703 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
706 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
707 fatal (".bss shrank when undumping???\n", 0, 0);
709 /* Set the output file to the right size and mmap it. Set
710 * pointers to various interesting objects. stat_buf still has
714 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
716 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
718 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
720 if (ftruncate (new_file, new_file_size))
721 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
723 new_base = (caddr_t) mmap (0, new_file_size, PROT_READ | PROT_WRITE,
724 #ifdef UNEXEC_USE_MAP_PRIVATE
731 if (new_base == (caddr_t) -1)
732 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
734 new_file_h = (ElfW(Ehdr) *) new_base;
735 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
736 new_section_h = (ElfW(Shdr) *)
737 ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
739 /* Make our new file, program and section headers as copies of the
743 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
744 memcpy (new_program_h, old_program_h,
745 old_file_h->e_phnum * old_file_h->e_phentsize);
747 /* Modify the e_shstrndx if necessary. */
748 PATCH_INDEX (new_file_h->e_shstrndx);
750 /* Fix up file header. We'll add one section. Section header is
754 new_file_h->e_shoff += new_data2_size;
755 new_file_h->e_shnum += 1;
758 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
759 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
760 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
761 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
764 /* Fix up a new program header. Extend the writable data segment so
765 * that the bss area is covered too. Find that segment by looking
766 * for a segment that ends just before the .bss area. Make sure
767 * that no segments are above the new .data2. Put a loop at the end
768 * to adjust the offset and address of any segment that is above
769 * data2, just in case we decide to allow this later.
772 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
774 /* Compute maximum of all requirements for alignment of section. */
775 ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align;
776 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
777 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
780 /* According to r02kar@x4u2.desy.de (Karsten Kuenne)
781 and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we
782 always get "Program segment above .bss" when dumping
783 when the executable doesn't have an sbss section. */
784 if (old_sbss_index != -1)
786 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
787 > (old_sbss_index == -1
789 : round_up (old_bss_addr, alignment)))
790 fatal ("Program segment above .bss in %s\n", old_name, 0);
792 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
793 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
794 + (NEW_PROGRAM_H (n)).p_filesz,
796 == round_up (old_bss_addr, alignment)))
800 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
802 /* Make sure that the size includes any padding before the old .bss
804 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
805 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
807 #if 0 /* Maybe allow section after data2 - does this ever happen? */
808 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
810 if (NEW_PROGRAM_H (n).p_vaddr
811 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
812 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
814 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
815 NEW_PROGRAM_H (n).p_offset += new_data2_size;
819 /* Fix up section headers based on new .data2 section. Any section
820 * whose offset or virtual address is after the new .data2 section
821 * gets its value adjusted. .bss size becomes zero and new address
822 * is set. data2 section header gets added by copying the existing
823 * .data header and modifying the offset, address and size.
825 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
827 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
830 if (old_data_index == old_file_h->e_shnum)
831 fatal ("Can't find .data in %s.\n", old_name, 0);
833 /* Walk through all section headers, insert the new data2 section right
834 before the new bss section. */
835 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
838 /* If it is (s)bss section, insert the new data2 section before it. */
839 /* new_data2_index is the index of either old_sbss or old_bss, that was
840 chosen as a section for new_data2. */
841 if (n == new_data2_index)
843 /* Steal the data section header for this data2 section. */
844 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
845 new_file_h->e_shentsize);
847 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
848 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
849 NEW_SECTION_H (nn).sh_size = new_data2_size;
850 /* Use the bss section's alignment. This will assure that the
851 new data2 section always be placed in the same spot as the old
852 bss section by any other application. */
853 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
855 /* Now copy over what we have in the memory now. */
856 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
857 (caddr_t) OLD_SECTION_H (n).sh_addr,
862 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
863 old_file_h->e_shentsize);
865 if (n == old_bss_index
866 /* The new bss and sbss section's size is zero, and its file offset
867 and virtual address should be off by NEW_DATA2_SIZE. */
868 || n == old_sbss_index
871 /* NN should be `old_s?bss_index + 1' at this point. */
872 NEW_SECTION_H (nn).sh_offset =
873 NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size;
874 NEW_SECTION_H (nn).sh_addr =
875 NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size;
876 /* Let the new bss section address alignment be the same as the
877 section address alignment followed the old bss section, so
878 this section will be placed in exactly the same place. */
879 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
880 NEW_SECTION_H (nn).sh_size = 0;
884 /* Any section that was original placed AFTER the bss
885 section should now be off by NEW_DATA2_SIZE. */
886 #ifdef SOLARIS_POWERPC
887 /* On PPC Reference Platform running Solaris 2.5.1
888 the plt section is also of type NOBI like the bss section.
889 (not really stored) and therefore sections after the bss
890 section start at the plt offset. The plt section is always
891 the one just before the bss section.
892 It would be better to put the new data section before
893 the .plt section, or use libelf instead.
894 Erik Deumens, deumens@qtp.ufl.edu. */
895 if (NEW_SECTION_H (nn).sh_offset
896 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
897 NEW_SECTION_H (nn).sh_offset += new_data2_size;
899 if (round_up (NEW_SECTION_H (nn).sh_offset,
900 OLD_SECTION_H (old_bss_index).sh_addralign)
902 NEW_SECTION_H (nn).sh_offset += new_data2_size;
904 /* Any section that was originally placed after the section
905 header table should now be off by the size of one section
906 header table entry. */
907 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
908 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
911 /* If any section hdr refers to the section after the new .data
912 section, make it refer to next one because we have inserted
913 a new section in between. */
915 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
916 /* For symbol tables, info is a symbol table index,
917 so don't change it. */
918 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
919 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
920 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
922 /* Now, start to copy the content of sections. */
923 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
924 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
927 /* Write out the sections. .data and .data1 (and data2, called
928 ".data" in the strings table) get copied from the current process
929 instead of the old file. */
930 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
931 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
933 /* Taking these sections from the current process, breaks
934 Linux in a subtle way. Binaries only run on the
935 architecture (e.g. i586 vs i686) of the dumping machine */
937 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
939 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
941 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
944 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
946 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
948 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
950 src = old_base + OLD_SECTION_H (n).sh_offset;
952 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
953 NEW_SECTION_H (nn).sh_size);
956 /* Update Alpha COFF symbol table: */
957 if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
960 pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
962 symhdr->cbLineOffset += new_data2_size;
963 symhdr->cbDnOffset += new_data2_size;
964 symhdr->cbPdOffset += new_data2_size;
965 symhdr->cbSymOffset += new_data2_size;
966 symhdr->cbOptOffset += new_data2_size;
967 symhdr->cbAuxOffset += new_data2_size;
968 symhdr->cbSsOffset += new_data2_size;
969 symhdr->cbSsExtOffset += new_data2_size;
970 symhdr->cbFdOffset += new_data2_size;
971 symhdr->cbRfdOffset += new_data2_size;
972 symhdr->cbExtOffset += new_data2_size;
974 #endif /* __alpha__ */
976 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
977 if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG && old_mdebug_index)
979 int diff = NEW_SECTION_H(nn).sh_offset
980 - OLD_SECTION_H(old_mdebug_index).sh_offset;
981 HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
985 phdr->cbLineOffset += diff;
986 phdr->cbDnOffset += diff;
987 phdr->cbPdOffset += diff;
988 phdr->cbSymOffset += diff;
989 phdr->cbOptOffset += diff;
990 phdr->cbAuxOffset += diff;
991 phdr->cbSsOffset += diff;
992 phdr->cbSsExtOffset += diff;
993 phdr->cbFdOffset += diff;
994 phdr->cbRfdOffset += diff;
995 phdr->cbExtOffset += diff;
998 #endif /* __sony_news && _SYSTYPE_SYSV */
1001 /* Adjust the HDRR offsets in .mdebug and copy the
1002 line data if it's in its usual 'hole' in the object.
1003 Makes the new file debuggable with dbx.
1004 patches up two problems: the absolute file offsets
1005 in the HDRR record of .mdebug (see /usr/include/syms.h), and
1006 the ld bug that gets the line table in a hole in the
1007 elf file rather than in the .mdebug section proper.
1008 David Anderson. davea@sgi.com Jan 16,1994. */
1009 if (n == old_mdebug_index)
1011 #define MDEBUGADJUST(__ct,__fileaddr) \
1012 if (n_phdrr->__ct > 0) \
1014 n_phdrr->__fileaddr += movement; \
1017 HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset);
1018 HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset);
1019 unsigned movement = new_data2_size;
1021 MDEBUGADJUST (idnMax, cbDnOffset);
1022 MDEBUGADJUST (ipdMax, cbPdOffset);
1023 MDEBUGADJUST (isymMax, cbSymOffset);
1024 MDEBUGADJUST (ioptMax, cbOptOffset);
1025 MDEBUGADJUST (iauxMax, cbAuxOffset);
1026 MDEBUGADJUST (issMax, cbSsOffset);
1027 MDEBUGADJUST (issExtMax, cbSsExtOffset);
1028 MDEBUGADJUST (ifdMax, cbFdOffset);
1029 MDEBUGADJUST (crfd, cbRfdOffset);
1030 MDEBUGADJUST (iextMax, cbExtOffset);
1031 /* The Line Section, being possible off in a hole of the object,
1032 requires special handling. */
1033 if (n_phdrr->cbLine > 0)
1035 if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset
1036 + OLD_SECTION_H (n).sh_size))
1038 /* line data is in a hole in elf. do special copy and adjust
1039 for this ld mistake.
1041 n_phdrr->cbLineOffset += movement;
1043 memcpy (n_phdrr->cbLineOffset + new_base,
1044 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
1048 /* somehow line data is in .mdebug as it is supposed to be. */
1049 MDEBUGADJUST (cbLine, cbLineOffset);
1055 /* If it is the symbol table, its st_shndx field needs to be patched. */
1056 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
1057 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
1059 ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
1060 unsigned int num = spt->sh_size / spt->sh_entsize;
1061 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
1063 for (; num--; sym++)
1065 if ((sym->st_shndx == SHN_UNDEF)
1066 || (sym->st_shndx == SHN_ABS)
1067 || (sym->st_shndx == SHN_COMMON))
1070 PATCH_INDEX (sym->st_shndx);
1075 /* Update the symbol values of _edata and _end. */
1076 for (n = new_file_h->e_shnum - 1; n; n--)
1079 ElfW(Sym) *symp, *symendp;
1081 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
1082 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
1085 symnames = ((byte *) new_base
1086 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
1087 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
1088 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
1090 for (; symp < symendp; symp ++)
1091 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
1092 || strcmp ((char *) (symnames + symp->st_name), "end") == 0
1093 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
1094 || strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
1095 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
1098 /* This loop seeks out relocation sections for the data section, so
1099 that it can undo relocations performed by the runtime linker. */
1100 for (n = new_file_h->e_shnum - 1; n; n--)
1102 ElfW(Shdr) section = NEW_SECTION_H (n);
1103 switch (section.sh_type) {
1108 /* This code handles two different size structs, but there should
1109 be no harm in that provided that r_offset is always the first
1111 nn = section.sh_info;
1112 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
1113 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1116 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1118 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1120 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1123 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1125 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1128 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr -
1129 NEW_SECTION_H (nn).sh_offset;
1130 caddr_t reloc = old_base + section.sh_offset, end;
1131 for (end = reloc + section.sh_size; reloc < end;
1132 reloc += section.sh_entsize)
1134 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
1136 /* The Alpha ELF binutils currently have a bug that
1137 sometimes results in relocs that contain all
1138 zeroes. Work around this for now... */
1139 if (((ElfW(Rel) *) reloc)->r_offset == 0)
1142 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
1149 #ifdef UNEXEC_USE_MAP_PRIVATE
1150 if (lseek (new_file, 0, SEEK_SET) == -1)
1151 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
1153 if (write (new_file, new_base, new_file_size) != new_file_size)
1154 fatal ("Can't write (%s): errno %d\n", new_name, errno);
1157 /* Close the files and make the new file executable. */
1159 if (close (old_file))
1160 fatal ("Can't close (%s): errno %d\n", old_name, errno);
1162 if (close (new_file))
1163 fatal ("Can't close (%s): errno %d\n", new_name, errno);
1165 if (stat (new_name, &stat_buf) == -1)
1166 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
1170 stat_buf.st_mode |= 0111 & ~n;
1171 if (chmod (new_name, stat_buf.st_mode) == -1)
1172 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);