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 ElfBitsW(bits, type) Elf##bits##_##type
486 # define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type
495 /* This macro expands `bits' before invoking ElfBitsW. */
496 # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type)
497 # define ElfW(type) ElfExpandBitsW (ELFSIZE, type)
500 #ifndef ELF_BSS_SECTION_NAME
501 #define ELF_BSS_SECTION_NAME ".bss"
504 /* Get the address of a particular section or program header entry,
505 * accounting for the size of the entries.
508 On PPC Reference Platform running Solaris 2.5.1
509 the plt section is also of type NOBI like the bss section.
510 (not really stored) and therefore sections after the bss
511 section start at the plt offset. The plt section is always
512 the one just before the bss section.
513 Thus, we modify the test from
514 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
516 if (NEW_SECTION_H (nn).sh_offset >=
517 OLD_SECTION_H (old_bss_index-1).sh_offset)
518 This is just a hack. We should put the new data section
519 before the .plt section.
520 And we should not have this routine at all but use
521 the libelf library to read the old file and create the new
523 The changed code is minimal and depends on prep set in m/prep.h
525 Quantum Theory Project
526 University of Florida
531 #define OLD_SECTION_H(n) \
532 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
533 #define NEW_SECTION_H(n) \
534 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
535 #define OLD_PROGRAM_H(n) \
536 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
537 #define NEW_PROGRAM_H(n) \
538 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
540 #define PATCH_INDEX(n) \
542 if ((int) (n) >= old_bss_index) \
544 typedef unsigned char byte;
546 /* Round X up to a multiple of Y. */
549 round_up (ElfW(Addr) x, ElfW(Addr) y)
557 /* ****************************************************************
562 * In ELF, this works by replacing the old .bss section with a new
563 * .data section, and inserting an empty .bss immediately afterwards.
566 void unexec (char *new_name, char *old_name, unsigned int data_start,
567 unsigned int bss_start, unsigned int entry_address);
569 unexec (char *new_name, char *old_name, unsigned int data_start,
570 unsigned int bss_start, unsigned int entry_address)
572 int new_file, old_file, new_file_size;
574 /* Pointers to the base of the image of the two files. */
575 caddr_t old_base, new_base;
577 /* Pointers to the file, program and section headers for the old and new
580 ElfW(Ehdr) *old_file_h, *new_file_h;
581 ElfW(Phdr) *old_program_h, *new_program_h;
582 ElfW(Shdr) *old_section_h, *new_section_h;
584 /* Point to the section name table in the old file */
585 char *old_section_names;
587 ElfW(Addr) old_bss_addr, new_bss_addr;
588 ElfW(Word) old_bss_size, new_data2_size;
589 ElfW(Off) new_data2_offset;
590 ElfW(Addr) new_data2_addr;
592 int n, nn, old_bss_index, old_data_index, new_data2_index;
593 int old_sbss_index, old_mdebug_index;
594 struct stat stat_buf;
596 /* Open the old file & map it into the address space. */
598 old_file = open (old_name, O_RDONLY);
601 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
603 if (fstat (old_file, &stat_buf) == -1)
604 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
606 old_base = (caddr_t) mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
608 if (old_base == (caddr_t) -1)
609 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
612 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
616 /* Get pointers to headers & section names */
618 old_file_h = (ElfW(Ehdr) *) old_base;
619 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
620 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
621 old_section_names = (char *) old_base
622 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
624 /* Find the old .bss section. Figure out parameters of the new
625 * data2 and bss sections.
628 for (old_bss_index = 1; old_bss_index < (int) old_file_h->e_shnum;
632 fprintf (stderr, "Looking for .bss - found %s\n",
633 old_section_names + OLD_SECTION_H (old_bss_index).sh_name);
635 if (!strcmp (old_section_names + OLD_SECTION_H (old_bss_index).sh_name,
636 ELF_BSS_SECTION_NAME))
639 if (old_bss_index == old_file_h->e_shnum)
640 fatal ("Can't find .bss in %s.\n", old_name, 0);
642 for (old_sbss_index = 1; old_sbss_index < (int) old_file_h->e_shnum;
646 fprintf (stderr, "Looking for .sbss - found %s\n",
647 old_section_names + OLD_SECTION_H (old_sbss_index).sh_name);
649 if (!strcmp (old_section_names + OLD_SECTION_H (old_sbss_index).sh_name,
653 if (old_sbss_index == old_file_h->e_shnum)
656 old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
657 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
658 new_data2_index = old_bss_index;
662 old_bss_addr = OLD_SECTION_H(old_sbss_index).sh_addr;
663 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size
664 + OLD_SECTION_H(old_sbss_index).sh_size;
665 new_data2_index = old_sbss_index;
668 for (old_mdebug_index = 1; old_mdebug_index < (int) old_file_h->e_shnum;
672 fprintf (stderr, "Looking for .mdebug - found %s\n",
673 old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name);
675 if (!strcmp (old_section_names + OLD_SECTION_H (old_mdebug_index).sh_name,
679 if (old_mdebug_index == old_file_h->e_shnum)
680 old_mdebug_index = 0;
682 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
686 fprintf (stderr, "Looking for .data - found %s\n",
687 old_section_names + OLD_SECTION_H (old_data_index).sh_name);
689 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
693 if (old_data_index == old_file_h->e_shnum)
696 #if defined (emacs) || !defined (DEBUG)
697 new_bss_addr = (ElfW(Addr)) sbrk (0);
699 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
701 new_data2_addr = old_bss_addr;
702 new_data2_size = new_bss_addr - old_bss_addr;
703 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
704 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
707 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
708 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
709 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
710 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
711 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
712 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
713 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
716 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
717 fatal (".bss shrank when undumping???\n", 0, 0);
719 /* Set the output file to the right size and mmap it. Set
720 * pointers to various interesting objects. stat_buf still has
724 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
726 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
728 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
730 if (ftruncate (new_file, new_file_size))
731 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
733 new_base = (caddr_t) mmap (0, new_file_size, PROT_READ | PROT_WRITE,
734 #ifdef UNEXEC_USE_MAP_PRIVATE
741 if (new_base == (caddr_t) -1)
742 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
744 new_file_h = (ElfW(Ehdr) *) new_base;
745 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
746 new_section_h = (ElfW(Shdr) *)
747 ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
749 /* Make our new file, program and section headers as copies of the
753 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
754 memcpy (new_program_h, old_program_h,
755 old_file_h->e_phnum * old_file_h->e_phentsize);
757 /* Modify the e_shstrndx if necessary. */
758 PATCH_INDEX (new_file_h->e_shstrndx);
760 /* Fix up file header. We'll add one section. Section header is
764 new_file_h->e_shoff += new_data2_size;
765 new_file_h->e_shnum += 1;
768 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
769 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
770 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
771 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
774 /* Fix up a new program header. Extend the writable data segment so
775 * that the bss area is covered too. Find that segment by looking
776 * for a segment that ends just before the .bss area. Make sure
777 * that no segments are above the new .data2. Put a loop at the end
778 * to adjust the offset and address of any segment that is above
779 * data2, just in case we decide to allow this later.
782 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
784 /* Compute maximum of all requirements for alignment of section. */
785 ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align;
786 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
787 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
790 /* According to r02kar@x4u2.desy.de (Karsten Kuenne)
791 and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we
792 always get "Program segment above .bss" when dumping
793 when the executable doesn't have an sbss section. */
794 if (old_sbss_index != -1)
796 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
797 > (old_sbss_index == -1
799 : round_up (old_bss_addr, alignment)))
800 fatal ("Program segment above .bss in %s\n", old_name, 0);
802 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
803 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
804 + (NEW_PROGRAM_H (n)).p_filesz,
806 == round_up (old_bss_addr, alignment)))
810 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
812 /* Make sure that the size includes any padding before the old .bss
814 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
815 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
817 #if 0 /* Maybe allow section after data2 - does this ever happen? */
818 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
820 if (NEW_PROGRAM_H (n).p_vaddr
821 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
822 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
824 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
825 NEW_PROGRAM_H (n).p_offset += new_data2_size;
829 /* Fix up section headers based on new .data2 section. Any section
830 * whose offset or virtual address is after the new .data2 section
831 * gets its value adjusted. .bss size becomes zero and new address
832 * is set. data2 section header gets added by copying the existing
833 * .data header and modifying the offset, address and size.
835 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
837 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
840 if (old_data_index == old_file_h->e_shnum)
841 fatal ("Can't find .data in %s.\n", old_name, 0);
843 /* Walk through all section headers, insert the new data2 section right
844 before the new bss section. */
845 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
848 /* If it is (s)bss section, insert the new data2 section before it. */
849 /* new_data2_index is the index of either old_sbss or old_bss, that was
850 chosen as a section for new_data2. */
851 if (n == new_data2_index)
853 /* Steal the data section header for this data2 section. */
854 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
855 new_file_h->e_shentsize);
857 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
858 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
859 NEW_SECTION_H (nn).sh_size = new_data2_size;
860 /* Use the bss section's alignment. This will assure that the
861 new data2 section always be placed in the same spot as the old
862 bss section by any other application. */
863 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
865 /* Now copy over what we have in the memory now. */
866 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
867 (caddr_t) OLD_SECTION_H (n).sh_addr,
872 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
873 old_file_h->e_shentsize);
875 if (n == old_bss_index
876 /* The new bss and sbss section's size is zero, and its file offset
877 and virtual address should be off by NEW_DATA2_SIZE. */
878 || n == old_sbss_index
881 /* NN should be `old_s?bss_index + 1' at this point. */
882 NEW_SECTION_H (nn).sh_offset =
883 NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size;
884 NEW_SECTION_H (nn).sh_addr =
885 NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size;
886 /* Let the new bss section address alignment be the same as the
887 section address alignment followed the old bss section, so
888 this section will be placed in exactly the same place. */
889 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
890 NEW_SECTION_H (nn).sh_size = 0;
894 /* Any section that was original placed AFTER the bss
895 section should now be off by NEW_DATA2_SIZE. */
896 #ifdef SOLARIS_POWERPC
897 /* On PPC Reference Platform running Solaris 2.5.1
898 the plt section is also of type NOBI like the bss section.
899 (not really stored) and therefore sections after the bss
900 section start at the plt offset. The plt section is always
901 the one just before the bss section.
902 It would be better to put the new data section before
903 the .plt section, or use libelf instead.
904 Erik Deumens, deumens@qtp.ufl.edu. */
905 if (NEW_SECTION_H (nn).sh_offset
906 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
907 NEW_SECTION_H (nn).sh_offset += new_data2_size;
909 if (round_up (NEW_SECTION_H (nn).sh_offset,
910 OLD_SECTION_H (old_bss_index).sh_addralign)
912 NEW_SECTION_H (nn).sh_offset += new_data2_size;
914 /* Any section that was originally placed after the section
915 header table should now be off by the size of one section
916 header table entry. */
917 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
918 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
921 /* If any section hdr refers to the section after the new .data
922 section, make it refer to next one because we have inserted
923 a new section in between. */
925 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
926 /* For symbol tables, info is a symbol table index,
927 so don't change it. */
928 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
929 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
930 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
932 /* Now, start to copy the content of sections. */
933 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
934 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
937 /* Write out the sections. .data and .data1 (and data2, called
938 ".data" in the strings table) get copied from the current process
939 instead of the old file. */
940 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
941 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
943 /* Taking these sections from the current process, breaks
944 Linux in a subtle way. Binaries only run on the
945 architecture (e.g. i586 vs i686) of the dumping machine */
947 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
949 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
951 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
954 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
956 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
958 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
960 src = old_base + OLD_SECTION_H (n).sh_offset;
962 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
963 NEW_SECTION_H (nn).sh_size);
966 /* Update Alpha COFF symbol table: */
967 if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
970 pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
972 symhdr->cbLineOffset += new_data2_size;
973 symhdr->cbDnOffset += new_data2_size;
974 symhdr->cbPdOffset += new_data2_size;
975 symhdr->cbSymOffset += new_data2_size;
976 symhdr->cbOptOffset += new_data2_size;
977 symhdr->cbAuxOffset += new_data2_size;
978 symhdr->cbSsOffset += new_data2_size;
979 symhdr->cbSsExtOffset += new_data2_size;
980 symhdr->cbFdOffset += new_data2_size;
981 symhdr->cbRfdOffset += new_data2_size;
982 symhdr->cbExtOffset += new_data2_size;
984 #endif /* __alpha__ */
986 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
987 if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG && old_mdebug_index)
989 int diff = NEW_SECTION_H(nn).sh_offset
990 - OLD_SECTION_H(old_mdebug_index).sh_offset;
991 HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
995 phdr->cbLineOffset += diff;
996 phdr->cbDnOffset += diff;
997 phdr->cbPdOffset += diff;
998 phdr->cbSymOffset += diff;
999 phdr->cbOptOffset += diff;
1000 phdr->cbAuxOffset += diff;
1001 phdr->cbSsOffset += diff;
1002 phdr->cbSsExtOffset += diff;
1003 phdr->cbFdOffset += diff;
1004 phdr->cbRfdOffset += diff;
1005 phdr->cbExtOffset += diff;
1008 #endif /* __sony_news && _SYSTYPE_SYSV */
1011 /* Adjust the HDRR offsets in .mdebug and copy the
1012 line data if it's in its usual 'hole' in the object.
1013 Makes the new file debuggable with dbx.
1014 patches up two problems: the absolute file offsets
1015 in the HDRR record of .mdebug (see /usr/include/syms.h), and
1016 the ld bug that gets the line table in a hole in the
1017 elf file rather than in the .mdebug section proper.
1018 David Anderson. davea@sgi.com Jan 16,1994. */
1019 if (n == old_mdebug_index)
1021 #define MDEBUGADJUST(__ct,__fileaddr) \
1022 if (n_phdrr->__ct > 0) \
1024 n_phdrr->__fileaddr += movement; \
1027 HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset);
1028 HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset);
1029 unsigned movement = new_data2_size;
1031 MDEBUGADJUST (idnMax, cbDnOffset);
1032 MDEBUGADJUST (ipdMax, cbPdOffset);
1033 MDEBUGADJUST (isymMax, cbSymOffset);
1034 MDEBUGADJUST (ioptMax, cbOptOffset);
1035 MDEBUGADJUST (iauxMax, cbAuxOffset);
1036 MDEBUGADJUST (issMax, cbSsOffset);
1037 MDEBUGADJUST (issExtMax, cbSsExtOffset);
1038 MDEBUGADJUST (ifdMax, cbFdOffset);
1039 MDEBUGADJUST (crfd, cbRfdOffset);
1040 MDEBUGADJUST (iextMax, cbExtOffset);
1041 /* The Line Section, being possible off in a hole of the object,
1042 requires special handling. */
1043 if (n_phdrr->cbLine > 0)
1045 if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset
1046 + OLD_SECTION_H (n).sh_size))
1048 /* line data is in a hole in elf. do special copy and adjust
1049 for this ld mistake.
1051 n_phdrr->cbLineOffset += movement;
1053 memcpy (n_phdrr->cbLineOffset + new_base,
1054 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
1058 /* somehow line data is in .mdebug as it is supposed to be. */
1059 MDEBUGADJUST (cbLine, cbLineOffset);
1065 /* If it is the symbol table, its st_shndx field needs to be patched. */
1066 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
1067 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
1069 ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
1070 unsigned int num = spt->sh_size / spt->sh_entsize;
1071 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
1073 for (; num--; sym++)
1075 if ((sym->st_shndx == SHN_UNDEF)
1076 || (sym->st_shndx == SHN_ABS)
1077 || (sym->st_shndx == SHN_COMMON))
1080 PATCH_INDEX (sym->st_shndx);
1085 /* Update the symbol values of _edata and _end. */
1086 for (n = new_file_h->e_shnum - 1; n; n--)
1089 ElfW(Sym) *symp, *symendp;
1091 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
1092 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
1095 symnames = ((byte *) new_base
1096 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
1097 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
1098 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
1100 for (; symp < symendp; symp ++)
1101 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
1102 || strcmp ((char *) (symnames + symp->st_name), "end") == 0
1103 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
1104 || strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
1105 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
1108 /* This loop seeks out relocation sections for the data section, so
1109 that it can undo relocations performed by the runtime linker. */
1110 for (n = new_file_h->e_shnum - 1; n; n--)
1112 ElfW(Shdr) section = NEW_SECTION_H (n);
1113 switch (section.sh_type) {
1118 /* This code handles two different size structs, but there should
1119 be no harm in that provided that r_offset is always the first
1121 nn = section.sh_info;
1122 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
1123 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1126 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1128 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1130 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1133 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1135 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1138 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr -
1139 NEW_SECTION_H (nn).sh_offset;
1140 caddr_t reloc = old_base + section.sh_offset, end;
1141 for (end = reloc + section.sh_size; reloc < end;
1142 reloc += section.sh_entsize)
1144 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
1146 /* The Alpha ELF binutils currently have a bug that
1147 sometimes results in relocs that contain all
1148 zeroes. Work around this for now... */
1149 if (((ElfW(Rel) *) reloc)->r_offset == 0)
1152 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
1159 #ifdef UNEXEC_USE_MAP_PRIVATE
1160 if (lseek (new_file, 0, SEEK_SET) == -1)
1161 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
1163 if (write (new_file, new_base, new_file_size) != new_file_size)
1164 fatal ("Can't write (%s): errno %d\n", new_name, errno);
1167 /* Close the files and make the new file executable. */
1169 if (close (old_file))
1170 fatal ("Can't close (%s): errno %d\n", old_name, errno);
1172 if (close (new_file))
1173 fatal ("Can't close (%s): errno %d\n", new_name, errno);
1175 if (stat (new_name, &stat_buf) == -1)
1176 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
1180 stat_buf.st_mode |= 0111 & ~n;
1181 if (chmod (new_name, stat_buf.st_mode) == -1)
1182 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);