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 defined(__FreeBSD__) && (defined(__alpha__) || defined(_LP64))
480 # define ElfW(type) Elf64_##type
482 # define ElfW(type) Elf64_/**/type
486 #if __GNU_LIBRARY__ - 0 >= 6
487 # include <link.h> /* get ElfW etc */
492 # define ElfBitsW(bits, type) Elf##bits##_##type
494 # define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type
503 /* This macro expands `bits' before invoking ElfBitsW. */
504 # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type)
505 # define ElfW(type) ElfExpandBitsW (ELFSIZE, type)
508 #ifndef ELF_BSS_SECTION_NAME
509 #define ELF_BSS_SECTION_NAME ".bss"
512 /* Get the address of a particular section or program header entry,
513 * accounting for the size of the entries.
516 On PPC Reference Platform running Solaris 2.5.1
517 the plt section is also of type NOBI like the bss section.
518 (not really stored) and therefore sections after the bss
519 section start at the plt offset. The plt section is always
520 the one just before the bss section.
521 Thus, we modify the test from
522 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
524 if (NEW_SECTION_H (nn).sh_offset >=
525 OLD_SECTION_H (old_bss_index-1).sh_offset)
526 This is just a hack. We should put the new data section
527 before the .plt section.
528 And we should not have this routine at all but use
529 the libelf library to read the old file and create the new
531 The changed code is minimal and depends on prep set in m/prep.h
533 Quantum Theory Project
534 University of Florida
539 #define OLD_SECTION_H(n) \
540 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
541 #define NEW_SECTION_H(n) \
542 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
543 #define OLD_PROGRAM_H(n) \
544 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
545 #define NEW_PROGRAM_H(n) \
546 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
548 #define PATCH_INDEX(n) \
550 if ((int) (n) >= old_bss_index) \
552 typedef unsigned char byte;
554 /* Round X up to a multiple of Y. */
557 round_up (ElfW(Addr) x, ElfW(Addr) y)
565 /* ****************************************************************
570 * In ELF, this works by replacing the old .bss section with a new
571 * .data section, and inserting an empty .bss immediately afterwards.
574 void unexec (char *new_name, char *old_name, unsigned int data_start,
575 unsigned int bss_start, unsigned int entry_address);
577 unexec (char *new_name, char *old_name, unsigned int data_start,
578 unsigned int bss_start, unsigned int entry_address)
580 int new_file, old_file, new_file_size;
582 /* Pointers to the base of the image of the two files. */
583 caddr_t old_base, new_base;
585 /* Pointers to the file, program and section headers for the old and new
588 ElfW(Ehdr) *old_file_h, *new_file_h;
589 ElfW(Phdr) *old_program_h, *new_program_h;
590 ElfW(Shdr) *old_section_h, *new_section_h;
592 /* Point to the section name table in the old file */
593 char *old_section_names;
595 ElfW(Addr) old_bss_addr, new_bss_addr;
596 ElfW(Word) old_bss_size, new_data2_size;
597 ElfW(Off) new_data2_offset;
598 ElfW(Addr) new_data2_addr;
600 int n, nn, old_bss_index, old_data_index, new_data2_index;
601 int old_sbss_index, old_mdebug_index;
602 struct stat stat_buf;
604 /* Open the old file & map it into the address space. */
606 old_file = open (old_name, O_RDONLY);
609 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
611 if (fstat (old_file, &stat_buf) == -1)
612 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
614 old_base = (caddr_t) mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
616 if (old_base == (caddr_t) -1)
617 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
620 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
624 /* Get pointers to headers & section names */
626 old_file_h = (ElfW(Ehdr) *) old_base;
627 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
628 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
629 old_section_names = (char *) old_base
630 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
632 /* Find the old .bss section. Figure out parameters of the new
633 * data2 and bss sections.
636 for (old_bss_index = 1; old_bss_index < (int) old_file_h->e_shnum;
640 fprintf (stderr, "Looking for .bss - found %s\n",
641 old_section_names + OLD_SECTION_H (old_bss_index).sh_name);
643 if (!strcmp (old_section_names + OLD_SECTION_H (old_bss_index).sh_name,
644 ELF_BSS_SECTION_NAME))
647 if (old_bss_index == old_file_h->e_shnum)
648 fatal ("Can't find .bss in %s.\n", old_name, 0);
650 for (old_sbss_index = 1; old_sbss_index < (int) old_file_h->e_shnum;
654 fprintf (stderr, "Looking for .sbss - found %s\n",
655 old_section_names + OLD_SECTION_H (old_sbss_index).sh_name);
657 if (!strcmp (old_section_names + OLD_SECTION_H (old_sbss_index).sh_name,
661 if (old_sbss_index == old_file_h->e_shnum)
664 old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
665 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
666 new_data2_index = old_bss_index;
670 old_bss_addr = OLD_SECTION_H(old_sbss_index).sh_addr;
671 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size
672 + OLD_SECTION_H(old_sbss_index).sh_size;
673 new_data2_index = old_sbss_index;
676 for (old_mdebug_index = 1; old_mdebug_index < (int) old_file_h->e_shnum;
680 fprintf (stderr, "Looking for .mdebug - found %s\n",
681 old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name);
683 if (!strcmp (old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name,
687 if (old_mdebug_index == old_file_h->e_shnum)
688 old_mdebug_index = 0;
690 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
694 fprintf (stderr, "Looking for .data - found %s\n",
695 old_section_names + OLD_SECTION_H (old_data_index).sh_name);
697 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
701 if (old_data_index == old_file_h->e_shnum)
704 #if defined (emacs) || !defined (DEBUG)
705 new_bss_addr = (ElfW(Addr)) sbrk (0);
707 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
709 new_data2_addr = old_bss_addr;
710 new_data2_size = new_bss_addr - old_bss_addr;
711 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
712 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
715 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
716 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
717 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
718 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
719 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
720 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
721 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
724 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
725 fatal (".bss shrank when undumping???\n", 0, 0);
727 /* Set the output file to the right size and mmap it. Set
728 * pointers to various interesting objects. stat_buf still has
732 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
734 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
736 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
738 if (ftruncate (new_file, new_file_size))
739 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
741 new_base = (caddr_t) mmap (0, new_file_size, PROT_READ | PROT_WRITE,
742 #ifdef UNEXEC_USE_MAP_PRIVATE
749 if (new_base == (caddr_t) -1)
750 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
752 new_file_h = (ElfW(Ehdr) *) new_base;
753 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
754 new_section_h = (ElfW(Shdr) *)
755 ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
757 /* Make our new file, program and section headers as copies of the
761 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
762 memcpy (new_program_h, old_program_h,
763 old_file_h->e_phnum * old_file_h->e_phentsize);
765 /* Modify the e_shstrndx if necessary. */
766 PATCH_INDEX (new_file_h->e_shstrndx);
768 /* Fix up file header. We'll add one section. Section header is
772 new_file_h->e_shoff += new_data2_size;
773 new_file_h->e_shnum += 1;
776 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
777 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
778 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
779 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
782 /* Fix up a new program header. Extend the writable data segment so
783 * that the bss area is covered too. Find that segment by looking
784 * for a segment that ends just before the .bss area. Make sure
785 * that no segments are above the new .data2. Put a loop at the end
786 * to adjust the offset and address of any segment that is above
787 * data2, just in case we decide to allow this later.
790 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
792 /* Compute maximum of all requirements for alignment of section. */
793 ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align;
794 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
795 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
798 /* According to r02kar@x4u2.desy.de (Karsten Kuenne)
799 and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we
800 always get "Program segment above .bss" when dumping
801 when the executable doesn't have an sbss section. */
802 if (old_sbss_index != -1)
804 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
805 > (old_sbss_index == -1
807 : round_up (old_bss_addr, alignment)))
808 fatal ("Program segment above .bss in %s\n", old_name, 0);
810 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
811 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
812 + (NEW_PROGRAM_H (n)).p_filesz,
814 == round_up (old_bss_addr, alignment)))
818 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
820 /* Make sure that the size includes any padding before the old .bss
822 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
823 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
825 #if 0 /* Maybe allow section after data2 - does this ever happen? */
826 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
828 if (NEW_PROGRAM_H (n).p_vaddr
829 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
830 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
832 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
833 NEW_PROGRAM_H (n).p_offset += new_data2_size;
837 /* Fix up section headers based on new .data2 section. Any section
838 * whose offset or virtual address is after the new .data2 section
839 * gets its value adjusted. .bss size becomes zero and new address
840 * is set. data2 section header gets added by copying the existing
841 * .data header and modifying the offset, address and size.
843 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
845 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
848 if (old_data_index == old_file_h->e_shnum)
849 fatal ("Can't find .data in %s.\n", old_name, 0);
851 /* Walk through all section headers, insert the new data2 section right
852 before the new bss section. */
853 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
856 /* If it is (s)bss section, insert the new data2 section before it. */
857 /* new_data2_index is the index of either old_sbss or old_bss, that was
858 chosen as a section for new_data2. */
859 if (n == new_data2_index)
861 /* Steal the data section header for this data2 section. */
862 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
863 new_file_h->e_shentsize);
865 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
866 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
867 NEW_SECTION_H (nn).sh_size = new_data2_size;
868 /* Use the bss section's alignment. This will assure that the
869 new data2 section always be placed in the same spot as the old
870 bss section by any other application. */
871 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
873 /* Now copy over what we have in the memory now. */
874 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
875 (caddr_t) OLD_SECTION_H (n).sh_addr,
880 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
881 old_file_h->e_shentsize);
883 if (n == old_bss_index
884 /* The new bss and sbss section's size is zero, and its file offset
885 and virtual address should be off by NEW_DATA2_SIZE. */
886 || n == old_sbss_index
889 /* NN should be `old_s?bss_index + 1' at this point. */
890 NEW_SECTION_H (nn).sh_offset =
891 NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size;
892 NEW_SECTION_H (nn).sh_addr =
893 NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size;
894 /* Let the new bss section address alignment be the same as the
895 section address alignment followed the old bss section, so
896 this section will be placed in exactly the same place. */
897 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
898 NEW_SECTION_H (nn).sh_size = 0;
902 /* Any section that was original placed AFTER the bss
903 section should now be off by NEW_DATA2_SIZE. */
904 #ifdef SOLARIS_POWERPC
905 /* On PPC Reference Platform running Solaris 2.5.1
906 the plt section is also of type NOBI like the bss section.
907 (not really stored) and therefore sections after the bss
908 section start at the plt offset. The plt section is always
909 the one just before the bss section.
910 It would be better to put the new data section before
911 the .plt section, or use libelf instead.
912 Erik Deumens, deumens@qtp.ufl.edu. */
913 if (NEW_SECTION_H (nn).sh_offset
914 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
915 NEW_SECTION_H (nn).sh_offset += new_data2_size;
917 if (round_up (NEW_SECTION_H (nn).sh_offset,
918 OLD_SECTION_H (old_bss_index).sh_addralign)
920 NEW_SECTION_H (nn).sh_offset += new_data2_size;
922 /* Any section that was originally placed after the section
923 header table should now be off by the size of one section
924 header table entry. */
925 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
926 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
929 /* If any section hdr refers to the section after the new .data
930 section, make it refer to next one because we have inserted
931 a new section in between. */
933 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
934 /* For symbol tables, info is a symbol table index,
935 so don't change it. */
936 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
937 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
938 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
940 /* Now, start to copy the content of sections. */
941 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
942 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
945 /* Write out the sections. .data and .data1 (and data2, called
946 ".data" in the strings table) get copied from the current process
947 instead of the old file. */
948 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
949 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
951 /* Taking these sections from the current process, breaks
952 Linux in a subtle way. Binaries only run on the
953 architecture (e.g. i586 vs i686) of the dumping machine */
955 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
957 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
959 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
962 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
964 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
966 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
968 src = old_base + OLD_SECTION_H (n).sh_offset;
970 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
971 NEW_SECTION_H (nn).sh_size);
974 /* Update Alpha COFF symbol table: */
975 if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
978 pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
980 symhdr->cbLineOffset += new_data2_size;
981 symhdr->cbDnOffset += new_data2_size;
982 symhdr->cbPdOffset += new_data2_size;
983 symhdr->cbSymOffset += new_data2_size;
984 symhdr->cbOptOffset += new_data2_size;
985 symhdr->cbAuxOffset += new_data2_size;
986 symhdr->cbSsOffset += new_data2_size;
987 symhdr->cbSsExtOffset += new_data2_size;
988 symhdr->cbFdOffset += new_data2_size;
989 symhdr->cbRfdOffset += new_data2_size;
990 symhdr->cbExtOffset += new_data2_size;
992 #endif /* __alpha__ */
994 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
995 if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG && old_mdebug_index)
997 int diff = NEW_SECTION_H(nn).sh_offset
998 - OLD_SECTION_H(old_mdebug_index).sh_offset;
999 HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
1003 phdr->cbLineOffset += diff;
1004 phdr->cbDnOffset += diff;
1005 phdr->cbPdOffset += diff;
1006 phdr->cbSymOffset += diff;
1007 phdr->cbOptOffset += diff;
1008 phdr->cbAuxOffset += diff;
1009 phdr->cbSsOffset += diff;
1010 phdr->cbSsExtOffset += diff;
1011 phdr->cbFdOffset += diff;
1012 phdr->cbRfdOffset += diff;
1013 phdr->cbExtOffset += diff;
1016 #endif /* __sony_news && _SYSTYPE_SYSV */
1019 /* Adjust the HDRR offsets in .mdebug and copy the
1020 line data if it's in its usual 'hole' in the object.
1021 Makes the new file debuggable with dbx.
1022 patches up two problems: the absolute file offsets
1023 in the HDRR record of .mdebug (see /usr/include/syms.h), and
1024 the ld bug that gets the line table in a hole in the
1025 elf file rather than in the .mdebug section proper.
1026 David Anderson. davea@sgi.com Jan 16,1994. */
1027 if (n == old_mdebug_index)
1029 #define MDEBUGADJUST(__ct,__fileaddr) \
1030 if (n_phdrr->__ct > 0) \
1032 n_phdrr->__fileaddr += movement; \
1035 HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset);
1036 HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset);
1037 unsigned movement = new_data2_size;
1039 MDEBUGADJUST (idnMax, cbDnOffset);
1040 MDEBUGADJUST (ipdMax, cbPdOffset);
1041 MDEBUGADJUST (isymMax, cbSymOffset);
1042 MDEBUGADJUST (ioptMax, cbOptOffset);
1043 MDEBUGADJUST (iauxMax, cbAuxOffset);
1044 MDEBUGADJUST (issMax, cbSsOffset);
1045 MDEBUGADJUST (issExtMax, cbSsExtOffset);
1046 MDEBUGADJUST (ifdMax, cbFdOffset);
1047 MDEBUGADJUST (crfd, cbRfdOffset);
1048 MDEBUGADJUST (iextMax, cbExtOffset);
1049 /* The Line Section, being possible off in a hole of the object,
1050 requires special handling. */
1051 if (n_phdrr->cbLine > 0)
1053 if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset
1054 + OLD_SECTION_H (n).sh_size))
1056 /* line data is in a hole in elf. do special copy and adjust
1057 for this ld mistake.
1059 n_phdrr->cbLineOffset += movement;
1061 memcpy (n_phdrr->cbLineOffset + new_base,
1062 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
1066 /* somehow line data is in .mdebug as it is supposed to be. */
1067 MDEBUGADJUST (cbLine, cbLineOffset);
1073 /* If it is the symbol table, its st_shndx field needs to be patched. */
1074 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
1075 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
1077 ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
1078 unsigned int num = spt->sh_size / spt->sh_entsize;
1079 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
1081 for (; num--; sym++)
1083 if ((sym->st_shndx == SHN_UNDEF)
1084 || (sym->st_shndx == SHN_ABS)
1085 || (sym->st_shndx == SHN_COMMON))
1088 PATCH_INDEX (sym->st_shndx);
1093 /* Update the symbol values of _edata and _end. */
1094 for (n = new_file_h->e_shnum - 1; n; n--)
1097 ElfW(Sym) *symp, *symendp;
1099 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
1100 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
1103 symnames = ((byte *) new_base
1104 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
1105 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
1106 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
1108 for (; symp < symendp; symp ++)
1109 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
1110 || strcmp ((char *) (symnames + symp->st_name), "end") == 0
1111 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
1112 || strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
1113 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
1116 /* This loop seeks out relocation sections for the data section, so
1117 that it can undo relocations performed by the runtime linker. */
1118 for (n = new_file_h->e_shnum - 1; n; n--)
1120 ElfW(Shdr) section = NEW_SECTION_H (n);
1121 switch (section.sh_type) {
1126 /* This code handles two different size structs, but there should
1127 be no harm in that provided that r_offset is always the first
1129 nn = section.sh_info;
1130 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
1131 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1134 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1136 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1138 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1141 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1143 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1146 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr -
1147 NEW_SECTION_H (nn).sh_offset;
1148 caddr_t reloc = old_base + section.sh_offset, end;
1149 for (end = reloc + section.sh_size; reloc < end;
1150 reloc += section.sh_entsize)
1152 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
1154 /* The Alpha ELF binutils currently have a bug that
1155 sometimes results in relocs that contain all
1156 zeroes. Work around this for now... */
1157 if (((ElfW(Rel) *) reloc)->r_offset == 0)
1160 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
1167 #ifdef UNEXEC_USE_MAP_PRIVATE
1168 if (lseek (new_file, 0, SEEK_SET) == -1)
1169 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
1171 if (write (new_file, new_base, new_file_size) != new_file_size)
1172 fatal ("Can't write (%s): errno %d\n", new_name, errno);
1175 /* Close the files and make the new file executable. */
1177 if (close (old_file))
1178 fatal ("Can't close (%s): errno %d\n", old_name, errno);
1180 if (close (new_file))
1181 fatal ("Can't close (%s): errno %d\n", new_name, errno);
1183 if (stat (new_name, &stat_buf) == -1)
1184 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
1188 stat_buf.st_mode |= 0111 & ~n;
1189 if (chmod (new_name, stat_buf.st_mode) == -1)
1190 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);