1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993, 1999, 2000
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 20.6.90. */
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 * Bss_start indicates how much of the data segment is to be saved in the
53 * a.out file and restored when the program is executed. It gives the lowest
54 * unsaved address, and is rounded up to a page boundary. The default when 0
55 * is given assumes that the entire data segment is to be stored, including
56 * the previous data and bss as well as any additional storage allocated with
59 * The new file is set up to start at entry_address.
63 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
66 * Basic theory: the data space of the running process needs to be
67 * dumped to the output file. Normally we would just enlarge the size
68 * of .data, scooting everything down. But we can't do that in ELF,
69 * because there is often something between the .data space and the
72 * In the temacs dump below, notice that the Global Offset Table
73 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
74 * .bss. It does not work to overlap .data with these fields.
76 * The solution is to create a new .data segment. This segment is
77 * filled with data from the current process. Since the contents of
78 * various sections refer to sections by index, the new .data segment
79 * is made the last in the table to avoid changing any existing index.
81 * This is an example of how the section headers are changed. "Addr"
82 * is a process virtual address. "Offset" is a file offset.
84 raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
88 **** SECTION HEADER TABLE ****
89 [No] Type Flags Addr Offset Size Name
90 Link Info Adralgn Entsize
92 [1] 1 2 0x80480d4 0xd4 0x13 .interp
95 [2] 5 2 0x80480e8 0xe8 0x388 .hash
98 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
101 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
104 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
107 [6] 1 6 0x8049348 0x1348 0x3 .init
110 [7] 1 6 0x804934c 0x134c 0x680 .plt
113 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
116 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
119 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
122 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
125 [12] 1 3 0x8088330 0x3f330 0x20afc .data
128 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
131 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
134 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
137 [16] 8 3 0x80a98f4 0x608f4 0x449c .bss
140 [17] 2 0 0 0x608f4 0x9b90 .symtab
143 [18] 3 0 0 0x6a484 0x8526 .strtab
146 [19] 3 0 0 0x729aa 0x93 .shstrtab
149 [20] 1 0 0 0x72a3d 0x68b7 .comment
152 raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
156 **** SECTION HEADER TABLE ****
157 [No] Type Flags Addr Offset Size Name
158 Link Info Adralgn Entsize
160 [1] 1 2 0x80480d4 0xd4 0x13 .interp
163 [2] 5 2 0x80480e8 0xe8 0x388 .hash
166 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
169 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
172 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
175 [6] 1 6 0x8049348 0x1348 0x3 .init
178 [7] 1 6 0x804934c 0x134c 0x680 .plt
181 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
184 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
187 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
190 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
193 [12] 1 3 0x8088330 0x3f330 0x20afc .data
196 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
199 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
202 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
205 [16] 8 3 0x80c6800 0x7d800 0 .bss
208 [17] 2 0 0 0x7d800 0x9b90 .symtab
211 [18] 3 0 0 0x87390 0x8526 .strtab
214 [19] 3 0 0 0x8f8b6 0x93 .shstrtab
217 [20] 1 0 0 0x8f949 0x68b7 .comment
220 [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
223 * This is an example of how the file header is changed. "Shoff" is
224 * the section header offset within the file. Since that table is
225 * after the new .data section, it is moved. "Shnum" is the number of
226 * sections, which we increment.
228 * "Phoff" is the file offset to the program header. "Phentsize" and
229 * "Shentsz" are the program and section header entries sizes respectively.
230 * These can be larger than the apparent struct sizes.
232 raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
237 Class Data Type Machine Version
238 Entry Phoff Shoff Flags Ehsize
239 Phentsize Phnum Shentsz Shnum Shstrndx
242 0x80499cc 0x34 0x792f4 0 0x34
245 raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
250 Class Data Type Machine Version
251 Entry Phoff Shoff Flags Ehsize
252 Phentsize Phnum Shentsz Shnum Shstrndx
255 0x80499cc 0x34 0x96200 0 0x34
258 * These are the program headers. "Offset" is the file offset to the
259 * segment. "Vaddr" is the memory load address. "Filesz" is the
260 * segment size as it appears in the file, and "Memsz" is the size in
261 * memory. Below, the third segment is the code and the fourth is the
262 * data: the difference between Filesz and Memsz is .bss
264 raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
267 ***** PROGRAM EXECUTION HEADER *****
268 Type Offset Vaddr Paddr
269 Filesz Memsz Flags Align
278 0x3f2f9 0x3f2f9 5 0x1000
280 1 0x3f330 0x8088330 0
281 0x215c4 0x25a60 7 0x1000
283 2 0x60874 0x80a9874 0
286 raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
289 ***** PROGRAM EXECUTION HEADER *****
290 Type Offset Vaddr Paddr
291 Filesz Memsz Flags Align
300 0x3f2f9 0x3f2f9 5 0x1000
302 1 0x3f330 0x8088330 0
303 0x3e4d0 0x3e4d0 7 0x1000
305 2 0x60874 0x80a9874 0
311 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
313 * The above mechanism does not work if the unexeced ELF file is being
314 * re-layout by other applications (such as `strip'). All the applications
315 * that re-layout the internal of ELF will layout all sections in ascending
316 * order of their file offsets. After the re-layout, the data2 section will
317 * still be the LAST section in the section header vector, but its file offset
318 * is now being pushed far away down, and causes part of it not to be mapped
319 * in (ie. not covered by the load segment entry in PHDR vector), therefore
320 * causes the new binary to fail.
322 * The solution is to modify the unexec algorithm to insert the new data2
323 * section header right before the new bss section header, so their file
324 * offsets will be in the ascending order. Since some of the section's (all
325 * sections AFTER the bss section) indexes are now changed, we also need to
326 * modify some fields to make them point to the right sections. This is done
327 * by macro PATCH_INDEX. All the fields that need to be patched are:
329 * 1. ELF header e_shstrndx field.
330 * 2. section header sh_link and sh_info field.
331 * 3. symbol table entry st_shndx field.
333 * The above example now should look like:
335 **** SECTION HEADER TABLE ****
336 [No] Type Flags Addr Offset Size Name
337 Link Info Adralgn Entsize
339 [1] 1 2 0x80480d4 0xd4 0x13 .interp
342 [2] 5 2 0x80480e8 0xe8 0x388 .hash
345 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
348 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
351 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
354 [6] 1 6 0x8049348 0x1348 0x3 .init
357 [7] 1 6 0x804934c 0x134c 0x680 .plt
360 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
363 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
366 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
369 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
372 [12] 1 3 0x8088330 0x3f330 0x20afc .data
375 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
378 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
381 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
384 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
387 [17] 8 3 0x80c6800 0x7d800 0 .bss
390 [18] 2 0 0 0x7d800 0x9b90 .symtab
393 [19] 3 0 0 0x87390 0x8526 .strtab
396 [20] 3 0 0 0x8f8b6 0x93 .shstrtab
399 [21] 1 0 0 0x8f949 0x68b7 .comment
405 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
408 extern void fatal (const char *, ...);
411 #include <sys/types.h>
413 #include <sys/stat.h>
419 #if !defined (__NetBSD__) && !defined (__OpenBSD__)
422 #include <sys/mman.h>
423 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
424 #include <sys/elf_mips.h>
426 #endif /* __sony_news && _SYSTYPE_SYSV */
428 #include <syms.h> /* for HDRR declaration */
431 #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__)
432 /* Declare COFF debugging symbol table. This used to be in
433 /usr/include/sym.h, but this file is no longer included in Red Hat
434 5.0 and presumably in any other glibc 2.x based distribution. */
462 #define cbHDRR sizeof(HDRR)
463 #define hdrNil ((pHDRR)0)
468 * NetBSD does not have normal-looking user-land ELF support.
475 # include <sys/exec_elf.h>
478 # define PT_LOAD Elf_pt_load
479 # define SHT_SYMTAB Elf_sht_symtab
480 # define SHT_DYNSYM Elf_sht_dynsym
481 # define SHT_NULL Elf_sht_null
482 # define SHT_NOBITS Elf_sht_nobits
483 # define SHT_REL Elf_sht_rel
484 # define SHT_RELA Elf_sht_rela
486 # define SHN_UNDEF Elf_eshn_undefined
487 # define SHN_ABS Elf_eshn_absolute
488 # define SHN_COMMON Elf_eshn_common
492 # include <sys/exec_ecoff.h>
493 # define HDRR struct ecoff_symhdr
494 # define pHDRR HDRR *
496 #endif /* __NetBSD__ */
499 # include <sys/exec_elf.h>
502 #if __GNU_LIBRARY__ - 0 >= 6
503 # include <link.h> /* get ElfW etc */
508 # define ElfBitsW(bits, type) Elf##bits##_##type
510 # define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type
517 /* This macro expands `bits' before invoking ElfBitsW. */
518 # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type)
519 # define ElfW(type) ElfExpandBitsW (ELFSIZE, type)
522 #ifndef ELF_BSS_SECTION_NAME
523 #define ELF_BSS_SECTION_NAME ".bss"
526 /* Get the address of a particular section or program header entry,
527 * accounting for the size of the entries.
530 On PPC Reference Platform running Solaris 2.5.1
531 the plt section is also of type NOBI like the bss section.
532 (not really stored) and therefore sections after the bss
533 section start at the plt offset. The plt section is always
534 the one just before the bss section.
535 Thus, we modify the test from
536 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
538 if (NEW_SECTION_H (nn).sh_offset >=
539 OLD_SECTION_H (old_bss_index-1).sh_offset)
540 This is just a hack. We should put the new data section
541 before the .plt section.
542 And we should not have this routine at all but use
543 the libelf library to read the old file and create the new
545 The changed code is minimal and depends on prep set in m/prep.h
547 Quantum Theory Project
548 University of Florida
553 #define OLD_SECTION_H(n) \
554 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
555 #define NEW_SECTION_H(n) \
556 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
557 #define OLD_PROGRAM_H(n) \
558 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
559 #define NEW_PROGRAM_H(n) \
560 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
562 #define PATCH_INDEX(n) \
564 if ((int) (n) >= old_bss_index) \
566 typedef unsigned char byte;
568 /* Round X up to a multiple of Y. */
571 round_up (ElfW(Addr) x, ElfW(Addr) y)
579 /* Return the index of the section named NAME.
580 SECTION_NAMES, FILE_NAME and FILE_H give information
581 about the file we are looking in.
583 If we don't find the section NAME, that is a fatal error
584 if NOERROR is 0; we return -1 if NOERROR is nonzero. */
587 find_section (name, section_names, file_name, old_file_h, old_section_h, noerror)
591 ElfW(Ehdr) *old_file_h;
592 ElfW(Shdr) *old_section_h;
597 for (idx = 1; idx < old_file_h->e_shnum; idx++)
600 fprintf (stderr, "Looking for %s - found %s\n", name,
601 section_names + OLD_SECTION_H (idx).sh_name);
603 if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
607 if (idx == old_file_h->e_shnum)
612 fatal ("Can't find %s in %s.\n", name, file_name, 0);
618 /* ****************************************************************
623 * In ELF, this works by replacing the old .bss section with a new
624 * .data section, and inserting an empty .bss immediately afterwards.
627 void unexec (char *new_name, char *old_name, unsigned int data_start,
628 unsigned int bss_start, unsigned int entry_address);
630 unexec (char *new_name, char *old_name, unsigned int data_start,
631 unsigned int bss_start, unsigned int entry_address)
633 int new_file, old_file, new_file_size;
635 /* Pointers to the base of the image of the two files. */
636 caddr_t old_base, new_base;
638 /* Pointers to the file, program and section headers for the old and new
641 ElfW(Ehdr) *old_file_h, *new_file_h;
642 ElfW(Phdr) *old_program_h, *new_program_h;
643 ElfW(Shdr) *old_section_h, *new_section_h;
645 /* Point to the section name table in the old file */
646 char *old_section_names;
648 ElfW(Addr) old_bss_addr, new_bss_addr;
649 ElfW(Word) old_bss_size, new_data2_size;
650 ElfW(Off) new_data2_offset;
651 ElfW(Addr) new_data2_addr;
654 int old_bss_index, old_sbss_index;
655 int old_data_index, new_data2_index;
656 int old_mdebug_index;
657 struct stat stat_buf;
659 /* Open the old file & map it into the address space. */
661 old_file = open (old_name, O_RDONLY);
664 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
666 if (fstat (old_file, &stat_buf) == -1)
667 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
669 old_base = (caddr_t) mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
671 if (old_base == (caddr_t) -1)
672 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
675 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
679 /* Get pointers to headers & section names */
681 old_file_h = (ElfW(Ehdr) *) old_base;
682 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
683 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
684 old_section_names = (char *) old_base
685 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
687 /* Find the mdebug section, if any. */
689 old_mdebug_index = find_section (".mdebug", old_section_names,
690 old_name, old_file_h, old_section_h, 1);
692 /* Find the old .bss section. Figure out parameters of the new
693 * data2 and bss sections.
696 old_bss_index = find_section (".bss", old_section_names,
697 old_name, old_file_h, old_section_h, 0);
699 old_sbss_index = find_section (".sbss", old_section_names,
700 old_name, old_file_h, old_section_h, 1);
701 if (old_sbss_index != -1)
702 if (OLD_SECTION_H (old_sbss_index).sh_type == SHT_PROGBITS)
705 if (old_sbss_index == -1)
707 old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
708 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
709 new_data2_index = old_bss_index;
713 old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr;
714 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size
715 + OLD_SECTION_H (old_sbss_index).sh_size;
716 new_data2_index = old_sbss_index;
719 /* Find the old .data section. Figure out parameters of
720 the new data2 and bss sections. */
722 old_data_index = find_section (".data", old_section_names,
723 old_name, old_file_h, old_section_h, 0);
725 #if defined (emacs) || !defined (DEBUG)
726 new_bss_addr = (ElfW(Addr)) sbrk (0);
728 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
730 new_data2_addr = old_bss_addr;
731 new_data2_size = new_bss_addr - old_bss_addr;
732 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
733 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
736 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
737 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
738 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
739 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
740 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
741 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
742 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
745 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
746 fatal (".bss shrank when undumping???\n", 0, 0);
748 /* Set the output file to the right size and mmap it. Set
749 * pointers to various interesting objects. stat_buf still has
753 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
755 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
757 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
759 if (ftruncate (new_file, new_file_size))
760 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
762 new_base = (caddr_t) mmap (0, new_file_size, PROT_READ | PROT_WRITE,
763 #ifdef UNEXEC_USE_MAP_PRIVATE
770 if (new_base == (caddr_t) -1)
771 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
773 new_file_h = (ElfW(Ehdr) *) new_base;
774 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
775 new_section_h = (ElfW(Shdr) *)
776 ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
778 /* Make our new file, program and section headers as copies of the
782 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
783 memcpy (new_program_h, old_program_h,
784 old_file_h->e_phnum * old_file_h->e_phentsize);
786 /* Modify the e_shstrndx if necessary. */
787 PATCH_INDEX (new_file_h->e_shstrndx);
789 /* Fix up file header. We'll add one section. Section header is
793 new_file_h->e_shoff += new_data2_size;
794 new_file_h->e_shnum += 1;
797 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
798 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
799 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
800 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
803 /* Fix up a new program header. Extend the writable data segment so
804 * that the bss area is covered too. Find that segment by looking
805 * for a segment that ends just before the .bss area. Make sure
806 * that no segments are above the new .data2. Put a loop at the end
807 * to adjust the offset and address of any segment that is above
808 * data2, just in case we decide to allow this later.
811 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
813 /* Compute maximum of all requirements for alignment of section. */
814 ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align;
815 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
816 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
819 /* According to r02kar@x4u2.desy.de (Karsten Kuenne)
820 and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we
821 always get "Program segment above .bss" when dumping
822 when the executable doesn't have an sbss section. */
823 if (old_sbss_index != -1)
825 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
826 > (old_sbss_index == -1
828 : round_up (old_bss_addr, alignment)))
829 fatal ("Program segment above .bss in %s\n", old_name, 0);
831 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
832 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
833 + (NEW_PROGRAM_H (n)).p_filesz,
835 == round_up (old_bss_addr, alignment)))
839 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
841 /* Make sure that the size includes any padding before the old .bss
843 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
844 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
846 #if 0 /* Maybe allow section after data2 - does this ever happen? */
847 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
849 if (NEW_PROGRAM_H (n).p_vaddr
850 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
851 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
853 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
854 NEW_PROGRAM_H (n).p_offset += new_data2_size;
858 /* Fix up section headers based on new .data2 section. Any section
859 * whose offset or virtual address is after the new .data2 section
860 * gets its value adjusted. .bss size becomes zero and new address
861 * is set. data2 section header gets added by copying the existing
862 * .data header and modifying the offset, address and size.
864 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
866 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
869 if (old_data_index == old_file_h->e_shnum)
870 fatal ("Can't find .data in %s.\n", old_name, 0);
872 /* Walk through all section headers, insert the new data2 section right
873 before the new bss section. */
874 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
877 /* If it is (s)bss section, insert the new data2 section before it. */
878 /* new_data2_index is the index of either old_sbss or old_bss, that was
879 chosen as a section for new_data2. */
880 if (n == new_data2_index)
882 /* Steal the data section header for this data2 section. */
883 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
884 new_file_h->e_shentsize);
886 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
887 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
888 NEW_SECTION_H (nn).sh_size = new_data2_size;
889 /* Use the bss section's alignment. This will assure that the
890 new data2 section always be placed in the same spot as the old
891 bss section by any other application. */
892 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
894 /* Now copy over what we have in the memory now. */
895 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
896 (caddr_t) OLD_SECTION_H (n).sh_addr,
901 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
902 old_file_h->e_shentsize);
904 if (n == old_bss_index
905 /* The new bss and sbss section's size is zero, and its file offset
906 and virtual address should be off by NEW_DATA2_SIZE. */
907 || n == old_sbss_index
910 /* NN should be `old_s?bss_index + 1' at this point. */
911 NEW_SECTION_H (nn).sh_offset =
912 NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size;
913 NEW_SECTION_H (nn).sh_addr =
914 NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size;
915 /* Let the new bss section address alignment be the same as the
916 section address alignment followed the old bss section, so
917 this section will be placed in exactly the same place. */
918 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
919 NEW_SECTION_H (nn).sh_size = 0;
923 /* Any section that was original placed AFTER the bss
924 section should now be off by NEW_DATA2_SIZE. */
925 #ifdef SOLARIS_POWERPC
926 /* On PPC Reference Platform running Solaris 2.5.1
927 the plt section is also of type NOBI like the bss section.
928 (not really stored) and therefore sections after the bss
929 section start at the plt offset. The plt section is always
930 the one just before the bss section.
931 It would be better to put the new data section before
932 the .plt section, or use libelf instead.
933 Erik Deumens, deumens@qtp.ufl.edu. */
934 if (NEW_SECTION_H (nn).sh_offset
935 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
936 NEW_SECTION_H (nn).sh_offset += new_data2_size;
938 if (round_up (NEW_SECTION_H (nn).sh_offset,
939 OLD_SECTION_H (old_bss_index).sh_addralign)
941 NEW_SECTION_H (nn).sh_offset += new_data2_size;
943 /* Any section that was originally placed after the section
944 header table should now be off by the size of one section
945 header table entry. */
946 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
947 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
950 /* If any section hdr refers to the section after the new .data
951 section, make it refer to next one because we have inserted
952 a new section in between. */
954 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
955 /* For symbol tables, info is a symbol table index,
956 so don't change it. */
957 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
958 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
959 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
961 if (old_sbss_index != -1)
962 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".sbss"))
964 NEW_SECTION_H (nn).sh_offset =
965 round_up (NEW_SECTION_H (nn).sh_offset,
966 NEW_SECTION_H (nn).sh_addralign);
967 NEW_SECTION_H (nn).sh_type = SHT_PROGBITS;
970 /* Now, start to copy the content of sections. */
971 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
972 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
975 /* Write out the sections. .data and .data1 (and data2, called
976 ".data" in the strings table) get copied from the current process
977 instead of the old file. */
978 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
979 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
981 /* Taking these sections from the current process, breaks
982 Linux in a subtle way. Binaries only run on the
983 architecture (e.g. i586 vs i686) of the dumping machine */
984 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
986 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
988 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
990 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
992 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
994 || !strcmp (old_section_names + NEW_SECTION_H (nn).sh_name,
996 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
998 src = old_base + OLD_SECTION_H (n).sh_offset;
1000 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
1001 NEW_SECTION_H (nn).sh_size);
1004 /* Update Alpha COFF symbol table: */
1005 if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
1008 pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
1010 symhdr->cbLineOffset += new_data2_size;
1011 symhdr->cbDnOffset += new_data2_size;
1012 symhdr->cbPdOffset += new_data2_size;
1013 symhdr->cbSymOffset += new_data2_size;
1014 symhdr->cbOptOffset += new_data2_size;
1015 symhdr->cbAuxOffset += new_data2_size;
1016 symhdr->cbSsOffset += new_data2_size;
1017 symhdr->cbSsExtOffset += new_data2_size;
1018 symhdr->cbFdOffset += new_data2_size;
1019 symhdr->cbRfdOffset += new_data2_size;
1020 symhdr->cbExtOffset += new_data2_size;
1022 #endif /* __alpha__ */
1024 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
1025 if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG
1026 && old_mdebug_index != -1)
1028 int diff = NEW_SECTION_H(nn).sh_offset
1029 - OLD_SECTION_H(old_mdebug_index).sh_offset;
1030 HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
1034 phdr->cbLineOffset += diff;
1035 phdr->cbDnOffset += diff;
1036 phdr->cbPdOffset += diff;
1037 phdr->cbSymOffset += diff;
1038 phdr->cbOptOffset += diff;
1039 phdr->cbAuxOffset += diff;
1040 phdr->cbSsOffset += diff;
1041 phdr->cbSsExtOffset += diff;
1042 phdr->cbFdOffset += diff;
1043 phdr->cbRfdOffset += diff;
1044 phdr->cbExtOffset += diff;
1047 #endif /* __sony_news && _SYSTYPE_SYSV */
1050 /* Adjust the HDRR offsets in .mdebug and copy the
1051 line data if it's in its usual 'hole' in the object.
1052 Makes the new file debuggable with dbx.
1053 patches up two problems: the absolute file offsets
1054 in the HDRR record of .mdebug (see /usr/include/syms.h), and
1055 the ld bug that gets the line table in a hole in the
1056 elf file rather than in the .mdebug section proper.
1057 David Anderson. davea@sgi.com Jan 16,1994. */
1058 if (n == old_mdebug_index)
1060 #define MDEBUGADJUST(__ct,__fileaddr) \
1061 if (n_phdrr->__ct > 0) \
1063 n_phdrr->__fileaddr += movement; \
1066 HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset);
1067 HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset);
1068 unsigned movement = new_data2_size;
1070 MDEBUGADJUST (idnMax, cbDnOffset);
1071 MDEBUGADJUST (ipdMax, cbPdOffset);
1072 MDEBUGADJUST (isymMax, cbSymOffset);
1073 MDEBUGADJUST (ioptMax, cbOptOffset);
1074 MDEBUGADJUST (iauxMax, cbAuxOffset);
1075 MDEBUGADJUST (issMax, cbSsOffset);
1076 MDEBUGADJUST (issExtMax, cbSsExtOffset);
1077 MDEBUGADJUST (ifdMax, cbFdOffset);
1078 MDEBUGADJUST (crfd, cbRfdOffset);
1079 MDEBUGADJUST (iextMax, cbExtOffset);
1080 /* The Line Section, being possible off in a hole of the object,
1081 requires special handling. */
1082 if (n_phdrr->cbLine > 0)
1084 if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset
1085 + OLD_SECTION_H (n).sh_size))
1087 /* line data is in a hole in elf. do special copy and adjust
1088 for this ld mistake.
1090 n_phdrr->cbLineOffset += movement;
1092 memcpy (n_phdrr->cbLineOffset + new_base,
1093 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
1097 /* somehow line data is in .mdebug as it is supposed to be. */
1098 MDEBUGADJUST (cbLine, cbLineOffset);
1104 /* If it is the symbol table, its st_shndx field needs to be patched. */
1105 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
1106 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
1108 ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
1109 unsigned int num = spt->sh_size / spt->sh_entsize;
1110 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
1112 for (; num--; sym++)
1114 if ((sym->st_shndx == SHN_UNDEF)
1115 || (sym->st_shndx == SHN_ABS)
1116 || (sym->st_shndx == SHN_COMMON))
1119 PATCH_INDEX (sym->st_shndx);
1124 /* Update the symbol values of _edata and _end. */
1125 for (n = new_file_h->e_shnum - 1; n; n--)
1128 ElfW(Sym) *symp, *symendp;
1130 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
1131 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
1134 symnames = ((byte *) new_base
1135 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
1136 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
1137 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
1139 for (; symp < symendp; symp ++)
1140 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
1141 || strcmp ((char *) (symnames + symp->st_name), "end") == 0
1142 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
1143 || strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
1144 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
1147 /* This loop seeks out relocation sections for the data section, so
1148 that it can undo relocations performed by the runtime linker. */
1149 for (n = new_file_h->e_shnum - 1; n; n--)
1151 ElfW(Shdr) section = NEW_SECTION_H (n);
1152 switch (section.sh_type) {
1157 /* This code handles two different size structs, but there should
1158 be no harm in that provided that r_offset is always the first
1160 nn = section.sh_info;
1161 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
1162 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1164 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1166 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1168 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1170 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1172 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
1175 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr -
1176 NEW_SECTION_H (nn).sh_offset;
1177 caddr_t reloc = old_base + section.sh_offset, end;
1178 for (end = reloc + section.sh_size; reloc < end;
1179 reloc += section.sh_entsize)
1181 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
1183 /* The Alpha ELF binutils currently have a bug that
1184 sometimes results in relocs that contain all
1185 zeroes. Work around this for now... */
1186 if (((ElfW(Rel) *) reloc)->r_offset == 0)
1189 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
1196 #ifdef UNEXEC_USE_MAP_PRIVATE
1197 if (lseek (new_file, 0, SEEK_SET) == -1)
1198 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
1200 if (write (new_file, new_base, new_file_size) != new_file_size)
1201 fatal ("Can't write (%s): errno %d\n", new_name, errno);
1204 /* Close the files and make the new file executable. */
1206 if (close (old_file))
1207 fatal ("Can't close (%s): errno %d\n", old_name, errno);
1209 if (close (new_file))
1210 fatal ("Can't close (%s): errno %d\n", new_name, errno);
1212 if (stat (new_name, &stat_buf) == -1)
1213 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
1217 stat_buf.st_mode |= 0111 & ~n;
1218 if (chmod (new_name, stat_buf.st_mode) == -1)
1219 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);