-/* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992
- Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-In other words, you are welcome to use, share and improve this program.
-You are forbidden to forbid anyone else to use, share and improve
-what you give them. Help stamp out software-hoarding! */
-
-
-/*
- * unexec.c - Convert a running program into an a.out file.
- *
- * Author: Spencer W. Thomas
- * Computer Science Dept.
- * University of Utah
- * Date: Tue Mar 2 1982
- * Modified heavily since then.
- *
- * Synopsis:
- * unexec (new_name, a_name, data_start, bss_start, entry_address)
- * char *new_name, *a_name;
- * unsigned data_start, bss_start, entry_address;
- *
- * Takes a snapshot of the program and makes an a.out format file in the
- * file named by the string argument new_name.
- * If a_name is non-NULL, the symbol table will be taken from the given file.
- * On some machines, an existing a_name file is required.
- *
- * The boundaries within the a.out file may be adjusted with the data_start
- * and bss_start arguments. Either or both may be given as 0 for defaults.
- *
- * Data_start gives the boundary between the text segment and the data
- * segment of the program. The text segment can contain shared, read-only
- * program code and literal data, while the data segment is always unshared
- * and unprotected. Data_start gives the lowest unprotected address.
- * The value you specify may be rounded down to a suitable boundary
- * as required by the machine you are using.
- *
- * Specifying zero for data_start means the boundary between text and data
- * should not be the same as when the program was loaded.
- * If NO_REMAP is defined, the argument data_start is ignored and the
- * segment boundaries are never changed.
- *
- * Bss_start indicates how much of the data segment is to be saved in the
- * a.out file and restored when the program is executed. It gives the lowest
- * unsaved address, and is rounded up to a page boundary. The default when 0
- * is given assumes that the entire data segment is to be stored, including
- * the previous data and bss as well as any additional storage allocated with
- * break (2).
- *
- * The new file is set up to start at entry_address.
- *
- * If you make improvements I'd like to get them too.
- * harpo!utah-cs!thomas, thomas@Utah-20
- *
- */
-
-/* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
- * ELF support added.
- *
- * Basic theory: the data space of the running process needs to be
- * dumped to the output file. Normally we would just enlarge the size
- * of .data, scooting everything down. But we can't do that in ELF,
- * because there is often something between the .data space and the
- * .bss space.
- *
- * In the temacs dump below, notice that the Global Offset Table
- * (.got) and the Dynamic link data (.dynamic) come between .data1 and
- * .bss. It does not work to overlap .data with these fields.
- *
- * The solution is to create a new .data segment. This segment is
- * filled with data from the current process. Since the contents of
- * various sections refer to sections by index, the new .data segment
- * is made the last in the table to avoid changing any existing index.
-
- * This is an example of how the section headers are changed. "Addr"
- * is a process virtual address. "Offset" is a file offset.
-
-raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
-
-temacs:
-
- **** SECTION HEADER TABLE ****
-[No] Type Flags Addr Offset Size Name
- Link Info Adralgn Entsize
-
-[1] 1 2 0x80480d4 0xd4 0x13 .interp
- 0 0 0x1 0
-
-[2] 5 2 0x80480e8 0xe8 0x388 .hash
- 3 0 0x4 0x4
-
-[3] 11 2 0x8048470 0x470 0x7f0 .dynsym
- 4 1 0x4 0x10
-
-[4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
- 0 0 0x1 0
-
-[5] 9 2 0x8049010 0x1010 0x338 .rel.plt
- 3 7 0x4 0x8
-
-[6] 1 6 0x8049348 0x1348 0x3 .init
- 0 0 0x4 0
-
-[7] 1 6 0x804934c 0x134c 0x680 .plt
- 0 0 0x4 0x4
-
-[8] 1 6 0x80499cc 0x19cc 0x3c56f .text
- 0 0 0x4 0
-
-[9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
- 0 0 0x4 0
-
-[10] 1 2 0x8085f40 0x3df40 0x69c .rodata
- 0 0 0x4 0
-
-[11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
- 0 0 0x4 0
-
-[12] 1 3 0x8088330 0x3f330 0x20afc .data
- 0 0 0x4 0
-
-[13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
- 0 0 0x4 0
-
-[14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
- 0 0 0x4 0x4
-
-[15] 6 3 0x80a9874 0x60874 0x80 .dynamic
- 4 0 0x4 0x8
-
-[16] 8 3 0x80a98f4 0x608f4 0x449c .bss
- 0 0 0x4 0
-
-[17] 2 0 0 0x608f4 0x9b90 .symtab
- 18 371 0x4 0x10
-
-[18] 3 0 0 0x6a484 0x8526 .strtab
- 0 0 0x1 0
-
-[19] 3 0 0 0x729aa 0x93 .shstrtab
- 0 0 0x1 0
-
-[20] 1 0 0 0x72a3d 0x68b7 .comment
- 0 0 0x1 0
-
-raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
-
-xemacs:
-
- **** SECTION HEADER TABLE ****
-[No] Type Flags Addr Offset Size Name
- Link Info Adralgn Entsize
-
-[1] 1 2 0x80480d4 0xd4 0x13 .interp
- 0 0 0x1 0
-
-[2] 5 2 0x80480e8 0xe8 0x388 .hash
- 3 0 0x4 0x4
-
-[3] 11 2 0x8048470 0x470 0x7f0 .dynsym
- 4 1 0x4 0x10
-
-[4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
- 0 0 0x1 0
-
-[5] 9 2 0x8049010 0x1010 0x338 .rel.plt
- 3 7 0x4 0x8
-
-[6] 1 6 0x8049348 0x1348 0x3 .init
- 0 0 0x4 0
-
-[7] 1 6 0x804934c 0x134c 0x680 .plt
- 0 0 0x4 0x4
-
-[8] 1 6 0x80499cc 0x19cc 0x3c56f .text
- 0 0 0x4 0
-
-[9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
- 0 0 0x4 0
-
-[10] 1 2 0x8085f40 0x3df40 0x69c .rodata
- 0 0 0x4 0
-
-[11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
- 0 0 0x4 0
-
-[12] 1 3 0x8088330 0x3f330 0x20afc .data
- 0 0 0x4 0
-
-[13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
- 0 0 0x4 0
-
-[14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
- 0 0 0x4 0x4
-
-[15] 6 3 0x80a9874 0x60874 0x80 .dynamic
- 4 0 0x4 0x8
-
-[16] 8 3 0x80c6800 0x7d800 0 .bss
- 0 0 0x4 0
-
-[17] 2 0 0 0x7d800 0x9b90 .symtab
- 18 371 0x4 0x10
-
-[18] 3 0 0 0x87390 0x8526 .strtab
- 0 0 0x1 0
-
-[19] 3 0 0 0x8f8b6 0x93 .shstrtab
- 0 0 0x1 0
-
-[20] 1 0 0 0x8f949 0x68b7 .comment
- 0 0 0x1 0
-
-[21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
- 0 0 0x4 0
-
- * This is an example of how the file header is changed. "Shoff" is
- * the section header offset within the file. Since that table is
- * after the new .data section, it is moved. "Shnum" is the number of
- * sections, which we increment.
- *
- * "Phoff" is the file offset to the program header. "Phentsize" and
- * "Shentsz" are the program and section header entries sizes respectively.
- * These can be larger than the apparent struct sizes.
-
-raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
-
-temacs:
-
- **** ELF HEADER ****
-Class Data Type Machine Version
-Entry Phoff Shoff Flags Ehsize
-Phentsize Phnum Shentsz Shnum Shstrndx
-
-1 1 2 3 1
-0x80499cc 0x34 0x792f4 0 0x34
-0x20 5 0x28 21 19
-
-raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
-
-xemacs:
-
- **** ELF HEADER ****
-Class Data Type Machine Version
-Entry Phoff Shoff Flags Ehsize
-Phentsize Phnum Shentsz Shnum Shstrndx
-
-1 1 2 3 1
-0x80499cc 0x34 0x96200 0 0x34
-0x20 5 0x28 22 19
-
- * These are the program headers. "Offset" is the file offset to the
- * segment. "Vaddr" is the memory load address. "Filesz" is the
- * segment size as it appears in the file, and "Memsz" is the size in
- * memory. Below, the third segment is the code and the fourth is the
- * data: the difference between Filesz and Memsz is .bss
-
-raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
-
-temacs:
- ***** PROGRAM EXECUTION HEADER *****
-Type Offset Vaddr Paddr
-Filesz Memsz Flags Align
-
-6 0x34 0x8048034 0
-0xa0 0xa0 5 0
-
-3 0xd4 0 0
-0x13 0 4 0
-
-1 0x34 0x8048034 0
-0x3f2f9 0x3f2f9 5 0x1000
-
-1 0x3f330 0x8088330 0
-0x215c4 0x25a60 7 0x1000
-
-2 0x60874 0x80a9874 0
-0x80 0 7 0
-
-raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
-
-xemacs:
- ***** PROGRAM EXECUTION HEADER *****
-Type Offset Vaddr Paddr
-Filesz Memsz Flags Align
-
-6 0x34 0x8048034 0
-0xa0 0xa0 5 0
-
-3 0xd4 0 0
-0x13 0 4 0
-
-1 0x34 0x8048034 0
-0x3f2f9 0x3f2f9 5 0x1000
-
-1 0x3f330 0x8088330 0
-0x3e4d0 0x3e4d0 7 0x1000
-
-2 0x60874 0x80a9874 0
-0x80 0 7 0
-
-
- */
-\f
-/* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
- *
- * The above mechanism does not work if the unexeced ELF file is being
- * re-layout by other applications (such as `strip'). All the applications
- * that re-layout the internal of ELF will layout all sections in ascending
- * order of their file offsets. After the re-layout, the data2 section will
- * still be the LAST section in the section header vector, but its file offset
- * is now being pushed far away down, and causes part of it not to be mapped
- * in (ie. not covered by the load segment entry in PHDR vector), therefore
- * causes the new binary to fail.
- *
- * The solution is to modify the unexec algorithm to insert the new data2
- * section header right before the new bss section header, so their file
- * offsets will be in the ascending order. Since some of the section's (all
- * sections AFTER the bss section) indexes are now changed, we also need to
- * modify some fields to make them point to the right sections. This is done
- * by macro PATCH_INDEX. All the fields that need to be patched are:
- *
- * 1. ELF header e_shstrndx field.
- * 2. section header sh_link and sh_info field.
- * 3. symbol table entry st_shndx field.
- *
- * The above example now should look like:
-
- **** SECTION HEADER TABLE ****
-[No] Type Flags Addr Offset Size Name
- Link Info Adralgn Entsize
-
-[1] 1 2 0x80480d4 0xd4 0x13 .interp
- 0 0 0x1 0
-
-[2] 5 2 0x80480e8 0xe8 0x388 .hash
- 3 0 0x4 0x4
-
-[3] 11 2 0x8048470 0x470 0x7f0 .dynsym
- 4 1 0x4 0x10
-
-[4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
- 0 0 0x1 0
-
-[5] 9 2 0x8049010 0x1010 0x338 .rel.plt
- 3 7 0x4 0x8
-
-[6] 1 6 0x8049348 0x1348 0x3 .init
- 0 0 0x4 0
-
-[7] 1 6 0x804934c 0x134c 0x680 .plt
- 0 0 0x4 0x4
-
-[8] 1 6 0x80499cc 0x19cc 0x3c56f .text
- 0 0 0x4 0
-
-[9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
- 0 0 0x4 0
-
-[10] 1 2 0x8085f40 0x3df40 0x69c .rodata
- 0 0 0x4 0
-
-[11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
- 0 0 0x4 0
-
-[12] 1 3 0x8088330 0x3f330 0x20afc .data
- 0 0 0x4 0
-
-[13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
- 0 0 0x4 0
-
-[14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
- 0 0 0x4 0x4
-
-[15] 6 3 0x80a9874 0x60874 0x80 .dynamic
- 4 0 0x4 0x8
-
-[16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
- 0 0 0x4 0
-
-[17] 8 3 0x80c6800 0x7d800 0 .bss
- 0 0 0x4 0
-
-[18] 2 0 0 0x7d800 0x9b90 .symtab
- 19 371 0x4 0x10
-
-[19] 3 0 0 0x87390 0x8526 .strtab
- 0 0 0x1 0
-
-[20] 3 0 0 0x8f8b6 0x93 .shstrtab
- 0 0 0x1 0
-
-[21] 1 0 0 0x8f949 0x68b7 .comment
- 0 0 0x1 0
-
- */
-\f
-#include <sys/types.h>
-#include <stdio.h>
-#include <sys/stat.h>
-#include <memory.h>
-#include <string.h>
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <elf.h>
-#include <sys/mman.h>
-
-#ifndef emacs
-#define fatal(a, b, c) fprintf(stderr, a, b, c), exit(1)
-#else
-extern void fatal(char *, ...);
-#endif
-
-/* Get the address of a particular section or program header entry,
- * accounting for the size of the entries.
- */
-
-#define OLD_SECTION_H(n) \
- (*(Elf32_Shdr *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
-#define NEW_SECTION_H(n) \
- (*(Elf32_Shdr *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
-#define OLD_PROGRAM_H(n) \
- (*(Elf32_Phdr *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
-#define NEW_PROGRAM_H(n) \
- (*(Elf32_Phdr *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
-
-#define PATCH_INDEX(n) \
- do { \
- if ((n) >= old_bss_index) \
- (n)++; } while (0)
-typedef unsigned char byte;
-
-/* Round X up to a multiple of Y. */
-
-int
-round_up (x, y)
- int x, y;
-{
- int rem = x % y;
- if (rem == 0)
- return x;
- return x - rem + y;
-}
-
-/* ****************************************************************
- * unexec
- *
- * driving logic.
- *
- * In ELF, this works by replacing the old .bss section with a new
- * .data section, and inserting an empty .bss immediately afterwards.
- *
- */
-void
-unexec (new_name, old_name, data_start, bss_start, entry_address)
- char *new_name, *old_name;
- unsigned data_start, bss_start, entry_address;
-{
- extern unsigned int bss_end;
- int new_file, old_file, new_file_size;
-
- /* Pointers to the base of the image of the two files. */
- caddr_t old_base, new_base;
-
- /* Pointers to the file, program and section headers for the old and new
- * files.
- */
- Elf32_Ehdr *old_file_h, *new_file_h;
- Elf32_Phdr *old_program_h, *new_program_h;
- Elf32_Shdr *old_section_h, *new_section_h;
-
- /* Point to the section name table in the old file */
- char *old_section_names;
-
- Elf32_Addr old_bss_addr, new_bss_addr;
- Elf32_Word old_bss_size, new_data2_size;
- Elf32_Off new_data2_offset;
- Elf32_Addr new_data2_addr;
-
- int n, nn, old_bss_index, old_data_index, new_data2_index;
- struct stat stat_buf;
-
- /* Open the old file & map it into the address space. */
-
- old_file = open (old_name, O_RDONLY);
-
- if (old_file < 0)
- fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
-
- if (fstat (old_file, &stat_buf) == -1)
- fatal ("Can't fstat(%s): errno %d\n", old_name, errno);
-
- old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
-
- if (old_base == (caddr_t) -1)
- fatal ("Can't mmap(%s): errno %d\n", old_name, errno);
-
-#ifdef DEBUG
- fprintf (stderr, "mmap(%s, %x) -> %x\n", old_name, stat_buf.st_size,
- old_base);
-#endif
-
- /* Get pointers to headers & section names */
-
- old_file_h = (Elf32_Ehdr *) old_base;
- old_program_h = (Elf32_Phdr *) ((byte *) old_base + old_file_h->e_phoff);
- old_section_h = (Elf32_Shdr *) ((byte *) old_base + old_file_h->e_shoff);
- old_section_names = (char *) old_base
- + OLD_SECTION_H(old_file_h->e_shstrndx).sh_offset;
-
- /* Find the old .bss section. Figure out parameters of the new
- * data2 and bss sections.
- */
-
- for (old_bss_index = 1; old_bss_index < old_file_h->e_shnum; old_bss_index++)
- {
-#ifdef DEBUG
- fprintf (stderr, "Looking for .bss - found %s\n",
- old_section_names + OLD_SECTION_H(old_bss_index).sh_name);
-#endif
- if (!strcmp (old_section_names + OLD_SECTION_H(old_bss_index).sh_name,
- ".bss"))
- break;
- }
- if (old_bss_index == old_file_h->e_shnum)
- fatal ("Can't find .bss in %s.\n", old_name, 0);
-
- old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
- old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
-#if defined(emacs) || !defined(DEBUG)
- bss_end = (unsigned int) sbrk (0);
- new_bss_addr = (Elf32_Addr) bss_end;
-#else
- new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
-#endif
- new_data2_addr = old_bss_addr;
- new_data2_size = new_bss_addr - old_bss_addr;
- new_data2_offset = OLD_SECTION_H(old_bss_index).sh_offset;
-
-#ifdef DEBUG
- fprintf (stderr, "old_bss_index %d\n", old_bss_index);
- fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
- fprintf (stderr, "old_bss_size %x\n", old_bss_size);
- fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
- fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
- fprintf (stderr, "new_data2_size %x\n", new_data2_size);
- fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
-#endif
-
- if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
- fatal (".bss shrank when undumping???\n", 0, 0);
-
- /* Set the output file to the right size and mmap(2) it. Set
- * pointers to various interesting objects. stat_buf still has
- * old_file data.
- */
-
- new_file = open (new_name, O_RDWR | O_CREAT, 0666);
- if (new_file < 0)
- fatal ("Can't creat(%s): errno %d\n", new_name, errno);
-
- new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
-
- if (ftruncate (new_file, new_file_size))
- fatal ("Can't ftruncate(%s): errno %d\n", new_name, errno);
-
- new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED,
- new_file, 0);
-
- if (new_base == (caddr_t) -1)
- fatal ("Can't mmap(%s): errno %d\n", new_name, errno);
-
- new_file_h = (Elf32_Ehdr *) new_base;
- new_program_h = (Elf32_Phdr *) ((byte *) new_base + old_file_h->e_phoff);
- new_section_h = (Elf32_Shdr *)
- ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
-
- /* Make our new file, program and section headers as copies of the
- * originals.
- */
-
- memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
- memcpy (new_program_h, old_program_h,
- old_file_h->e_phnum * old_file_h->e_phentsize);
-
- /* Modify the e_shstrndx if necessary. */
- PATCH_INDEX (new_file_h->e_shstrndx);
-
- /* Fix up file header. We'll add one section. Section header is
- * further away now.
- */
-
- new_file_h->e_shoff += new_data2_size;
- new_file_h->e_shnum += 1;
-
-#ifdef DEBUG
- fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
- fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
- fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
- fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
-#endif
-
- /* Fix up a new program header. Extend the writable data segment so
- * that the bss area is covered too. Find that segment by looking
- * for a segment that ends just before the .bss area. Make sure
- * that no segments are above the new .data2. Put a loop at the end
- * to adjust the offset and address of any segment that is above
- * data2, just in case we decide to allow this later.
- */
-
- for (n = new_file_h->e_phnum - 1; n >= 0; n--)
- {
- /* Compute maximum of all requirements for alignment of section. */
- int alignment = (NEW_PROGRAM_H (n)).p_align;
- if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
- alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
-
- if (NEW_PROGRAM_H(n).p_vaddr + NEW_PROGRAM_H(n).p_filesz > old_bss_addr)
- fatal ("Program segment above .bss in %s\n", old_name, 0);
-
- if (NEW_PROGRAM_H(n).p_type == PT_LOAD
- && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
- + (NEW_PROGRAM_H (n)).p_filesz,
- alignment)
- == round_up (old_bss_addr, alignment)))
- break;
- }
- if (n < 0)
- fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
-
- NEW_PROGRAM_H(n).p_filesz += new_data2_size;
- NEW_PROGRAM_H(n).p_memsz = NEW_PROGRAM_H(n).p_filesz;
-
-#if 0 /* Maybe allow section after data2 - does this ever happen? */
- for (n = new_file_h->e_phnum - 1; n >= 0; n--)
- {
- if (NEW_PROGRAM_H(n).p_vaddr
- && NEW_PROGRAM_H(n).p_vaddr >= new_data2_addr)
- NEW_PROGRAM_H(n).p_vaddr += new_data2_size - old_bss_size;
-
- if (NEW_PROGRAM_H(n).p_offset >= new_data2_offset)
- NEW_PROGRAM_H(n).p_offset += new_data2_size;
- }
-#endif
-
- /* Fix up section headers based on new .data2 section. Any section
- * whose offset or virtual address is after the new .data2 section
- * gets its value adjusted. .bss size becomes zero and new address
- * is set. data2 section header gets added by copying the existing
- * .data header and modifying the offset, address and size.
- */
- for (old_data_index = 1; old_data_index < old_file_h->e_shnum;
- old_data_index++)
- if (!strcmp (old_section_names + OLD_SECTION_H(old_data_index).sh_name,
- ".data"))
- break;
- if (old_data_index == old_file_h->e_shnum)
- fatal ("Can't find .data in %s.\n", old_name, 0);
-
- /* Walk through all section headers, insert the new data2 section right
- before the new bss section. */
- for (n = 1, nn = 1; n < old_file_h->e_shnum; n++, nn++)
- {
- caddr_t src;
- /* If it is bss section, insert the new data2 section before it. */
- if (n == old_bss_index)
- {
- /* Steal the data section header for this data2 section. */
- memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index),
- new_file_h->e_shentsize);
-
- NEW_SECTION_H(nn).sh_addr = new_data2_addr;
- NEW_SECTION_H(nn).sh_offset = new_data2_offset;
- NEW_SECTION_H(nn).sh_size = new_data2_size;
- /* Use the bss section's alignment. This will assure that the
- new data2 section always be placed in the same spot as the old
- bss section by any other application. */
- NEW_SECTION_H(nn).sh_addralign = OLD_SECTION_H(n).sh_addralign;
-
- /* Now copy over what we have in the memory now. */
- memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
- (caddr_t) OLD_SECTION_H(n).sh_addr,
- new_data2_size);
- nn++;
- }
-
- memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(n),
- old_file_h->e_shentsize);
-
- /* The new bss section's size is zero, and its file offset and virtual
- address should be off by NEW_DATA2_SIZE. */
- if (n == old_bss_index)
- {
- /* NN should be `old_bss_index + 1' at this point. */
- NEW_SECTION_H(nn).sh_offset += new_data2_size;
- NEW_SECTION_H(nn).sh_addr += new_data2_size;
- /* Let the new bss section address alignment be the same as the
- section address alignment followed the old bss section, so
- this section will be placed in exactly the same place. */
- NEW_SECTION_H(nn).sh_addralign = OLD_SECTION_H(nn).sh_addralign;
- NEW_SECTION_H(nn).sh_size = 0;
- }
- /* Any section that was original placed AFTER the bss section should now
- be off by NEW_DATA2_SIZE. */
- else if (NEW_SECTION_H(nn).sh_offset >= new_data2_offset)
- NEW_SECTION_H(nn).sh_offset += new_data2_size;
-
- /* If any section hdr refers to the section after the new .data
- section, make it refer to next one because we have inserted
- a new section in between. */
-
- PATCH_INDEX(NEW_SECTION_H(nn).sh_link);
- PATCH_INDEX(NEW_SECTION_H(nn).sh_info);
-
- /* Now, start to copy the content of sections. */
- if (NEW_SECTION_H(nn).sh_type == SHT_NULL
- || NEW_SECTION_H(nn).sh_type == SHT_NOBITS)
- continue;
-
- /* Write out the sections. .data and .data1 (and data2, called
- * ".data" in the strings table) get copied from the current process
- * instead of the old file.
- */
- if (!strcmp (old_section_names + NEW_SECTION_H(n).sh_name, ".data")
- || !strcmp ((old_section_names + NEW_SECTION_H(n).sh_name),
- ".data1"))
- src = (caddr_t) OLD_SECTION_H(n).sh_addr;
- else
- src = old_base + OLD_SECTION_H(n).sh_offset;
-
- memcpy (NEW_SECTION_H(nn).sh_offset + new_base, src,
- NEW_SECTION_H(nn).sh_size);
-
- /* If it is the symbol table, its st_shndx field needs to be patched. */
- if (NEW_SECTION_H(nn).sh_type == SHT_SYMTAB
- || NEW_SECTION_H(nn).sh_type == SHT_DYNSYM)
- {
- Elf32_Shdr *spt = &NEW_SECTION_H(nn);
- unsigned int num = spt->sh_size / spt->sh_entsize;
- Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H(nn).sh_offset +
- new_base);
- for (; num--; sym++)
- {
- if ((sym->st_shndx == SHN_UNDEF)
- || (sym->st_shndx == SHN_ABS)
- || (sym->st_shndx == SHN_COMMON))
- continue;
-
- PATCH_INDEX(sym->st_shndx);
- }
- }
- }
-
- /* Close the files and make the new file executable */
-
- if (close (old_file))
- fatal ("Can't close(%s): errno %d\n", old_name, errno);
-
- if (close (new_file))
- fatal ("Can't close(%s): errno %d\n", new_name, errno);
-
- if (stat (new_name, &stat_buf) == -1)
- fatal ("Can't stat(%s): errno %d\n", new_name, errno);
-
- n = umask (777);
- umask (n);
- stat_buf.st_mode |= 0111 & ~n;
- if (chmod (new_name, stat_buf.st_mode) == -1)
- fatal ("Can't chmod(%s): errno %d\n", new_name, errno);
-}
+/* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000, 2001,
+ 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING. If not, write to
+the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA.
+
+In other words, you are welcome to use, share and improve this program.
+You are forbidden to forbid anyone else to use, share and improve
+what you give them. Help stamp out software-hoarding! */
+
+
+/*
+ * unexec.c - Convert a running program into an a.out file.
+ *
+ * Author: Spencer W. Thomas
+ * Computer Science Dept.
+ * University of Utah
+ * Date: Tue Mar 2 1982
+ * Modified heavily since then.
+ *
+ * Synopsis:
+ * unexec (new_name, old_name, data_start, bss_start, entry_address)
+ * char *new_name, *old_name;
+ * unsigned data_start, bss_start, entry_address;
+ *
+ * Takes a snapshot of the program and makes an a.out format file in the
+ * file named by the string argument new_name.
+ * If old_name is non-NULL, the symbol table will be taken from the given file.
+ * On some machines, an existing old_name file is required.
+ *
+ * The boundaries within the a.out file may be adjusted with the data_start
+ * and bss_start arguments. Either or both may be given as 0 for defaults.
+ *
+ * Data_start gives the boundary between the text segment and the data
+ * segment of the program. The text segment can contain shared, read-only
+ * program code and literal data, while the data segment is always unshared
+ * and unprotected. Data_start gives the lowest unprotected address.
+ * The value you specify may be rounded down to a suitable boundary
+ * as required by the machine you are using.
+ *
+ * Bss_start indicates how much of the data segment is to be saved in the
+ * a.out file and restored when the program is executed. It gives the lowest
+ * unsaved address, and is rounded up to a page boundary. The default when 0
+ * is given assumes that the entire data segment is to be stored, including
+ * the previous data and bss as well as any additional storage allocated with
+ * break (2).
+ *
+ * The new file is set up to start at entry_address.
+ *
+ */
+
+/* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
+ * ELF support added.
+ *
+ * Basic theory: the data space of the running process needs to be
+ * dumped to the output file. Normally we would just enlarge the size
+ * of .data, scooting everything down. But we can't do that in ELF,
+ * because there is often something between the .data space and the
+ * .bss space.
+ *
+ * In the temacs dump below, notice that the Global Offset Table
+ * (.got) and the Dynamic link data (.dynamic) come between .data1 and
+ * .bss. It does not work to overlap .data with these fields.
+ *
+ * The solution is to create a new .data segment. This segment is
+ * filled with data from the current process. Since the contents of
+ * various sections refer to sections by index, the new .data segment
+ * is made the last in the table to avoid changing any existing index.
+
+ * This is an example of how the section headers are changed. "Addr"
+ * is a process virtual address. "Offset" is a file offset.
+
+raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
+
+temacs:
+
+ **** SECTION HEADER TABLE ****
+ [No] Type Flags Addr Offset Size Name
+ Link Info Adralgn Entsize
+
+ [1] 1 2 0x80480d4 0xd4 0x13 .interp
+ 0 0 0x1 0
+
+ [2] 5 2 0x80480e8 0xe8 0x388 .hash
+ 3 0 0x4 0x4
+
+ [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
+ 4 1 0x4 0x10
+
+ [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
+ 0 0 0x1 0
+
+ [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
+ 3 7 0x4 0x8
+
+ [6] 1 6 0x8049348 0x1348 0x3 .init
+ 0 0 0x4 0
+
+ [7] 1 6 0x804934c 0x134c 0x680 .plt
+ 0 0 0x4 0x4
+
+ [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
+ 0 0 0x4 0
+
+ [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
+ 0 0 0x4 0
+
+ [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
+ 0 0 0x4 0
+
+ [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
+ 0 0 0x4 0
+
+ [12] 1 3 0x8088330 0x3f330 0x20afc .data
+ 0 0 0x4 0
+
+ [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
+ 0 0 0x4 0
+
+ [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
+ 0 0 0x4 0x4
+
+ [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
+ 4 0 0x4 0x8
+
+ [16] 8 3 0x80a98f4 0x608f4 0x449c .bss
+ 0 0 0x4 0
+
+ [17] 2 0 0 0x608f4 0x9b90 .symtab
+ 18 371 0x4 0x10
+
+ [18] 3 0 0 0x6a484 0x8526 .strtab
+ 0 0 0x1 0
+
+ [19] 3 0 0 0x729aa 0x93 .shstrtab
+ 0 0 0x1 0
+
+ [20] 1 0 0 0x72a3d 0x68b7 .comment
+ 0 0 0x1 0
+
+ raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
+
+ xemacs:
+
+ **** SECTION HEADER TABLE ****
+ [No] Type Flags Addr Offset Size Name
+ Link Info Adralgn Entsize
+
+ [1] 1 2 0x80480d4 0xd4 0x13 .interp
+ 0 0 0x1 0
+
+ [2] 5 2 0x80480e8 0xe8 0x388 .hash
+ 3 0 0x4 0x4
+
+ [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
+ 4 1 0x4 0x10
+
+ [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
+ 0 0 0x1 0
+
+ [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
+ 3 7 0x4 0x8
+
+ [6] 1 6 0x8049348 0x1348 0x3 .init
+ 0 0 0x4 0
+
+ [7] 1 6 0x804934c 0x134c 0x680 .plt
+ 0 0 0x4 0x4
+
+ [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
+ 0 0 0x4 0
+
+ [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
+ 0 0 0x4 0
+
+ [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
+ 0 0 0x4 0
+
+ [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
+ 0 0 0x4 0
+
+ [12] 1 3 0x8088330 0x3f330 0x20afc .data
+ 0 0 0x4 0
+
+ [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
+ 0 0 0x4 0
+
+ [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
+ 0 0 0x4 0x4
+
+ [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
+ 4 0 0x4 0x8
+
+ [16] 8 3 0x80c6800 0x7d800 0 .bss
+ 0 0 0x4 0
+
+ [17] 2 0 0 0x7d800 0x9b90 .symtab
+ 18 371 0x4 0x10
+
+ [18] 3 0 0 0x87390 0x8526 .strtab
+ 0 0 0x1 0
+
+ [19] 3 0 0 0x8f8b6 0x93 .shstrtab
+ 0 0 0x1 0
+
+ [20] 1 0 0 0x8f949 0x68b7 .comment
+ 0 0 0x1 0
+
+ [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
+ 0 0 0x4 0
+
+ * This is an example of how the file header is changed. "Shoff" is
+ * the section header offset within the file. Since that table is
+ * after the new .data section, it is moved. "Shnum" is the number of
+ * sections, which we increment.
+ *
+ * "Phoff" is the file offset to the program header. "Phentsize" and
+ * "Shentsz" are the program and section header entries sizes respectively.
+ * These can be larger than the apparent struct sizes.
+
+ raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
+
+ temacs:
+
+ **** ELF HEADER ****
+ Class Data Type Machine Version
+ Entry Phoff Shoff Flags Ehsize
+ Phentsize Phnum Shentsz Shnum Shstrndx
+
+ 1 1 2 3 1
+ 0x80499cc 0x34 0x792f4 0 0x34
+ 0x20 5 0x28 21 19
+
+ raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
+
+ xemacs:
+
+ **** ELF HEADER ****
+ Class Data Type Machine Version
+ Entry Phoff Shoff Flags Ehsize
+ Phentsize Phnum Shentsz Shnum Shstrndx
+
+ 1 1 2 3 1
+ 0x80499cc 0x34 0x96200 0 0x34
+ 0x20 5 0x28 22 19
+
+ * These are the program headers. "Offset" is the file offset to the
+ * segment. "Vaddr" is the memory load address. "Filesz" is the
+ * segment size as it appears in the file, and "Memsz" is the size in
+ * memory. Below, the third segment is the code and the fourth is the
+ * data: the difference between Filesz and Memsz is .bss
+
+ raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
+
+ temacs:
+ ***** PROGRAM EXECUTION HEADER *****
+ Type Offset Vaddr Paddr
+ Filesz Memsz Flags Align
+
+ 6 0x34 0x8048034 0
+ 0xa0 0xa0 5 0
+
+ 3 0xd4 0 0
+ 0x13 0 4 0
+
+ 1 0x34 0x8048034 0
+ 0x3f2f9 0x3f2f9 5 0x1000
+
+ 1 0x3f330 0x8088330 0
+ 0x215c4 0x25a60 7 0x1000
+
+ 2 0x60874 0x80a9874 0
+ 0x80 0 7 0
+
+ raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
+
+ xemacs:
+ ***** PROGRAM EXECUTION HEADER *****
+ Type Offset Vaddr Paddr
+ Filesz Memsz Flags Align
+
+ 6 0x34 0x8048034 0
+ 0xa0 0xa0 5 0
+
+ 3 0xd4 0 0
+ 0x13 0 4 0
+
+ 1 0x34 0x8048034 0
+ 0x3f2f9 0x3f2f9 5 0x1000
+
+ 1 0x3f330 0x8088330 0
+ 0x3e4d0 0x3e4d0 7 0x1000
+
+ 2 0x60874 0x80a9874 0
+ 0x80 0 7 0
+
+
+ */
+\f
+/* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
+ *
+ * The above mechanism does not work if the unexeced ELF file is being
+ * re-layout by other applications (such as `strip'). All the applications
+ * that re-layout the internal of ELF will layout all sections in ascending
+ * order of their file offsets. After the re-layout, the data2 section will
+ * still be the LAST section in the section header vector, but its file offset
+ * is now being pushed far away down, and causes part of it not to be mapped
+ * in (ie. not covered by the load segment entry in PHDR vector), therefore
+ * causes the new binary to fail.
+ *
+ * The solution is to modify the unexec algorithm to insert the new data2
+ * section header right before the new bss section header, so their file
+ * offsets will be in the ascending order. Since some of the section's (all
+ * sections AFTER the bss section) indexes are now changed, we also need to
+ * modify some fields to make them point to the right sections. This is done
+ * by macro PATCH_INDEX. All the fields that need to be patched are:
+ *
+ * 1. ELF header e_shstrndx field.
+ * 2. section header sh_link and sh_info field.
+ * 3. symbol table entry st_shndx field.
+ *
+ * The above example now should look like:
+
+ **** SECTION HEADER TABLE ****
+ [No] Type Flags Addr Offset Size Name
+ Link Info Adralgn Entsize
+
+ [1] 1 2 0x80480d4 0xd4 0x13 .interp
+ 0 0 0x1 0
+
+ [2] 5 2 0x80480e8 0xe8 0x388 .hash
+ 3 0 0x4 0x4
+
+ [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
+ 4 1 0x4 0x10
+
+ [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
+ 0 0 0x1 0
+
+ [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
+ 3 7 0x4 0x8
+
+ [6] 1 6 0x8049348 0x1348 0x3 .init
+ 0 0 0x4 0
+
+ [7] 1 6 0x804934c 0x134c 0x680 .plt
+ 0 0 0x4 0x4
+
+ [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
+ 0 0 0x4 0
+
+ [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
+ 0 0 0x4 0
+
+ [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
+ 0 0 0x4 0
+
+ [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
+ 0 0 0x4 0
+
+ [12] 1 3 0x8088330 0x3f330 0x20afc .data
+ 0 0 0x4 0
+
+ [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
+ 0 0 0x4 0
+
+ [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
+ 0 0 0x4 0x4
+
+ [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
+ 4 0 0x4 0x8
+
+ [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
+ 0 0 0x4 0
+
+ [17] 8 3 0x80c6800 0x7d800 0 .bss
+ 0 0 0x4 0
+
+ [18] 2 0 0 0x7d800 0x9b90 .symtab
+ 19 371 0x4 0x10
+
+ [19] 3 0 0 0x87390 0x8526 .strtab
+ 0 0 0x1 0
+
+ [20] 3 0 0 0x8f8b6 0x93 .shstrtab
+ 0 0 0x1 0
+
+ [21] 1 0 0 0x8f949 0x68b7 .comment
+ 0 0 0x1 0
+
+ */
+\f
+/* We do not use mmap because that fails with NFS.
+ Instead we read the whole file, modify it, and write it out. */
+
+#ifndef emacs
+#define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
+#include <string.h>
+#else
+#include <config.h>
+extern void fatal (const char *msgid, ...);
+#endif
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <memory.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#if !defined (__NetBSD__) && !defined (__OpenBSD__)
+#include <elf.h>
+#endif
+#include <sys/mman.h>
+#if defined (__sony_news) && defined (_SYSTYPE_SYSV)
+#include <sys/elf_mips.h>
+#include <sym.h>
+#endif /* __sony_news && _SYSTYPE_SYSV */
+#if __sgi
+#include <syms.h> /* for HDRR declaration */
+#endif /* __sgi */
+#ifdef BROKEN_NOCOMBRELOC
+#include <assert.h>
+#endif
+
+#ifndef MAP_ANON
+#ifdef MAP_ANONYMOUS
+#define MAP_ANON MAP_ANONYMOUS
+#else
+#define MAP_ANON 0
+#endif
+#endif
+
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *) -1)
+#endif
+
+#if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__)
+/* Declare COFF debugging symbol table. This used to be in
+ /usr/include/sym.h, but this file is no longer included in Red Hat
+ 5.0 and presumably in any other glibc 2.x based distribution. */
+typedef struct {
+ short magic;
+ short vstamp;
+ int ilineMax;
+ int idnMax;
+ int ipdMax;
+ int isymMax;
+ int ioptMax;
+ int iauxMax;
+ int issMax;
+ int issExtMax;
+ int ifdMax;
+ int crfd;
+ int iextMax;
+ long cbLine;
+ long cbLineOffset;
+ long cbDnOffset;
+ long cbPdOffset;
+ long cbSymOffset;
+ long cbOptOffset;
+ long cbAuxOffset;
+ long cbSsOffset;
+ long cbSsExtOffset;
+ long cbFdOffset;
+ long cbRfdOffset;
+ long cbExtOffset;
+} HDRR, *pHDRR;
+#define cbHDRR sizeof(HDRR)
+#define hdrNil ((pHDRR)0)
+#endif
+
+#ifdef __NetBSD__
+/*
+ * NetBSD does not have normal-looking user-land ELF support.
+ */
+# if defined __alpha__ || defined __sparc_v9__
+# define ELFSIZE 64
+# else
+# define ELFSIZE 32
+# endif
+# include <sys/exec_elf.h>
+
+# ifndef PT_LOAD
+# define PT_LOAD Elf_pt_load
+# if 0 /* was in pkgsrc patches for 20.7 */
+# define SHT_PROGBITS Elf_sht_progbits
+# endif
+# define SHT_SYMTAB Elf_sht_symtab
+# define SHT_DYNSYM Elf_sht_dynsym
+# define SHT_NULL Elf_sht_null
+# define SHT_NOBITS Elf_sht_nobits
+# define SHT_REL Elf_sht_rel
+# define SHT_RELA Elf_sht_rela
+
+# define SHN_UNDEF Elf_eshn_undefined
+# define SHN_ABS Elf_eshn_absolute
+# define SHN_COMMON Elf_eshn_common
+# endif /* !PT_LOAD */
+
+# ifdef __alpha__
+# include <sys/exec_ecoff.h>
+# define HDRR struct ecoff_symhdr
+# define pHDRR HDRR *
+# endif /* __alpha__ */
+
+#ifdef __mips__ /* was in pkgsrc patches for 20.7 */
+# define SHT_MIPS_DEBUG DT_MIPS_FLAGS
+# define HDRR struct Elf_Shdr
+#endif /* __mips__ */
+#endif /* __NetBSD__ */
+
+#ifdef __OpenBSD__
+# include <sys/exec_elf.h>
+#endif
+
+#if __GNU_LIBRARY__ - 0 >= 6
+# include <link.h> /* get ElfW etc */
+#endif
+
+#ifndef ElfW
+# ifdef __STDC__
+# define ElfBitsW(bits, type) Elf##bits##_##type
+# else
+# define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type
+# endif
+# ifdef _LP64
+# define ELFSIZE 64
+# else
+# define ELFSIZE 32
+# endif
+ /* This macro expands `bits' before invoking ElfBitsW. */
+# define ElfExpandBitsW(bits, type) ElfBitsW (bits, type)
+# define ElfW(type) ElfExpandBitsW (ELFSIZE, type)
+#endif
+
+#ifndef ELF_BSS_SECTION_NAME
+#define ELF_BSS_SECTION_NAME ".bss"
+#endif
+
+/* Get the address of a particular section or program header entry,
+ * accounting for the size of the entries.
+ */
+/*
+ On PPC Reference Platform running Solaris 2.5.1
+ the plt section is also of type NOBI like the bss section.
+ (not really stored) and therefore sections after the bss
+ section start at the plt offset. The plt section is always
+ the one just before the bss section.
+ Thus, we modify the test from
+ if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
+ to
+ if (NEW_SECTION_H (nn).sh_offset >=
+ OLD_SECTION_H (old_bss_index-1).sh_offset)
+ This is just a hack. We should put the new data section
+ before the .plt section.
+ And we should not have this routine at all but use
+ the libelf library to read the old file and create the new
+ file.
+ The changed code is minimal and depends on prep set in m/prep.h
+ Erik Deumens
+ Quantum Theory Project
+ University of Florida
+ deumens@qtp.ufl.edu
+ Apr 23, 1996
+ */
+
+#define OLD_SECTION_H(n) \
+ (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
+#define NEW_SECTION_H(n) \
+ (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
+#define OLD_PROGRAM_H(n) \
+ (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
+#define NEW_PROGRAM_H(n) \
+ (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
+
+#define PATCH_INDEX(n) \
+ do { \
+ if ((int) (n) >= old_bss_index) \
+ (n)++; } while (0)
+typedef unsigned char byte;
+
+/* Round X up to a multiple of Y. */
+
+static ElfW(Addr)
+round_up (x, y)
+ ElfW(Addr) x, y;
+{
+ int rem = x % y;
+ if (rem == 0)
+ return x;
+ return x - rem + y;
+}
+
+/* Return the index of the section named NAME.
+ SECTION_NAMES, FILE_NAME and FILE_H give information
+ about the file we are looking in.
+
+ If we don't find the section NAME, that is a fatal error
+ if NOERROR is 0; we return -1 if NOERROR is nonzero. */
+
+static int
+find_section (name, section_names, file_name, old_file_h, old_section_h, noerror)
+ char *name;
+ char *section_names;
+ char *file_name;
+ ElfW(Ehdr) *old_file_h;
+ ElfW(Shdr) *old_section_h;
+ int noerror;
+{
+ int idx;
+
+ for (idx = 1; idx < old_file_h->e_shnum; idx++)
+ {
+#ifdef DEBUG
+ fprintf (stderr, "Looking for %s - found %s\n", name,
+ section_names + OLD_SECTION_H (idx).sh_name);
+#endif
+ if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
+ name))
+ break;
+ }
+ if (idx == old_file_h->e_shnum)
+ {
+ if (noerror)
+ return -1;
+ else
+ fatal ("Can't find %s in %s.\n", name, file_name);
+ }
+
+ return idx;
+}
+
+/* ****************************************************************
+ * unexec
+ *
+ * driving logic.
+ *
+ * In ELF, this works by replacing the old .bss section with a new
+ * .data section, and inserting an empty .bss immediately afterwards.
+ *
+ */
+void
+unexec (new_name, old_name, data_start, bss_start, entry_address)
+ char *new_name, *old_name;
+ unsigned data_start, bss_start, entry_address;
+{
+ int new_file, old_file, new_file_size;
+
+ /* Pointers to the base of the image of the two files. */
+ caddr_t old_base, new_base;
+
+#if MAP_ANON == 0
+ int mmap_fd;
+#else
+# define mmap_fd -1
+#endif
+
+ /* Pointers to the file, program and section headers for the old and
+ new files. */
+ ElfW(Ehdr) *old_file_h, *new_file_h;
+ ElfW(Phdr) *old_program_h, *new_program_h;
+ ElfW(Shdr) *old_section_h, *new_section_h;
+
+ /* Point to the section name table in the old file. */
+ char *old_section_names;
+
+ ElfW(Addr) old_bss_addr, new_bss_addr;
+ ElfW(Word) old_bss_size, new_data2_size;
+ ElfW(Off) new_data2_offset;
+ ElfW(Addr) new_data2_addr;
+
+ int n, nn;
+ int old_bss_index, old_sbss_index, old_plt_index;
+ int old_data_index, new_data2_index;
+ int old_mdebug_index;
+ struct stat stat_buf;
+ int old_file_size;
+#ifdef BROKEN_NOCOMBRELOC
+ int unreloc_sections[10], n_unreloc_sections;
+#endif
+
+ /* Open the old file, allocate a buffer of the right size, and read
+ in the file contents. */
+
+ old_file = open (old_name, O_RDONLY);
+
+ if (old_file < 0)
+ fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
+
+ if (fstat (old_file, &stat_buf) == -1)
+ fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
+
+#if MAP_ANON == 0
+ mmap_fd = open ("/dev/zero", O_RDONLY);
+ if (mmap_fd < 0)
+ fatal ("Can't open /dev/zero for reading: errno %d\n", errno, 0);
+#endif
+
+ /* We cannot use malloc here because that may use sbrk. If it does,
+ we'd dump our temporary buffers with Emacs, and we'd have to be
+ extra careful to use the correct value of sbrk(0) after
+ allocating all buffers in the code below, which we aren't. */
+ old_file_size = stat_buf.st_size;
+ old_base = mmap (NULL, old_file_size, PROT_READ | PROT_WRITE,
+ MAP_ANON | MAP_PRIVATE, mmap_fd, 0);
+ if (old_base == MAP_FAILED)
+ fatal ("Can't allocate buffer for %s\n", old_name, 0);
+
+ if (read (old_file, old_base, stat_buf.st_size) != stat_buf.st_size)
+ fatal ("Didn't read all of %s: errno %d\n", old_name, errno);
+
+ /* Get pointers to headers & section names */
+
+ old_file_h = (ElfW(Ehdr) *) old_base;
+ old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
+ old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
+ old_section_names = (char *) old_base
+ + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
+
+ /* Find the mdebug section, if any. */
+
+ old_mdebug_index = find_section (".mdebug", old_section_names,
+ old_name, old_file_h, old_section_h, 1);
+
+ /* Find the old .bss section. Figure out parameters of the new
+ data2 and bss sections. */
+
+ old_bss_index = find_section (".bss", old_section_names,
+ old_name, old_file_h, old_section_h, 0);
+
+ old_sbss_index = find_section (".sbss", old_section_names,
+ old_name, old_file_h, old_section_h, 1);
+ if (old_sbss_index != -1)
+ if (OLD_SECTION_H (old_sbss_index).sh_type != SHT_NOBITS)
+ old_sbss_index = -1;
+
+ /* PowerPC64 has .plt in the BSS section. */
+ old_plt_index = find_section (".plt", old_section_names,
+ old_name, old_file_h, old_section_h, 1);
+ if (old_plt_index != -1)
+ if (OLD_SECTION_H (old_plt_index).sh_type != SHT_NOBITS)
+ old_plt_index = -1;
+
+ if (old_sbss_index == -1 && old_plt_index == -1)
+ {
+ old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
+ old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
+ new_data2_index = old_bss_index;
+ }
+ else if (old_plt_index != -1
+ && (old_sbss_index == -1
+ || (OLD_SECTION_H (old_sbss_index).sh_addr
+ > OLD_SECTION_H (old_plt_index).sh_addr)))
+ {
+ old_bss_addr = OLD_SECTION_H (old_plt_index).sh_addr;
+ old_bss_size = OLD_SECTION_H (old_bss_index).sh_size
+ + OLD_SECTION_H (old_plt_index).sh_size;
+ if (old_sbss_index != -1)
+ old_bss_size += OLD_SECTION_H (old_sbss_index).sh_size;
+ new_data2_index = old_plt_index;
+ }
+ else
+ {
+ old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr;
+ old_bss_size = OLD_SECTION_H (old_bss_index).sh_size
+ + OLD_SECTION_H (old_sbss_index).sh_size;
+ new_data2_index = old_sbss_index;
+ }
+
+ /* Find the old .data section. Figure out parameters of
+ the new data2 and bss sections. */
+
+ old_data_index = find_section (".data", old_section_names,
+ old_name, old_file_h, old_section_h, 0);
+
+#if defined (emacs) || !defined (DEBUG)
+ new_bss_addr = (ElfW(Addr)) sbrk (0);
+#else
+ new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
+#endif
+ new_data2_addr = old_bss_addr;
+ new_data2_size = new_bss_addr - old_bss_addr;
+ new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
+ (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
+
+#ifdef DEBUG
+ fprintf (stderr, "old_bss_index %d\n", old_bss_index);
+ fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
+ fprintf (stderr, "old_bss_size %x\n", old_bss_size);
+ fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
+ fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
+ fprintf (stderr, "new_data2_size %x\n", new_data2_size);
+ fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
+#endif
+
+ if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
+ fatal (".bss shrank when undumping???\n", 0, 0);
+
+ /* Set the output file to the right size. Allocate a buffer to hold
+ the image of the new file. Set pointers to various interesting
+ objects. stat_buf still has old_file data. */
+
+ new_file = open (new_name, O_RDWR | O_CREAT, 0666);
+ if (new_file < 0)
+ fatal ("Can't creat (%s): errno %d\n", new_name, errno);
+
+ new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
+
+ if (ftruncate (new_file, new_file_size))
+ fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
+
+ new_base = mmap (NULL, new_file_size, PROT_READ | PROT_WRITE,
+ MAP_ANON | MAP_PRIVATE, mmap_fd, 0);
+ if (new_base == MAP_FAILED)
+ fatal ("Can't allocate buffer for %s\n", old_name, 0);
+
+ new_file_h = (ElfW(Ehdr) *) new_base;
+ new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
+ new_section_h = (ElfW(Shdr) *)
+ ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
+
+ /* Make our new file, program and section headers as copies of the
+ originals. */
+
+ memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
+ memcpy (new_program_h, old_program_h,
+ old_file_h->e_phnum * old_file_h->e_phentsize);
+
+ /* Modify the e_shstrndx if necessary. */
+ PATCH_INDEX (new_file_h->e_shstrndx);
+
+ /* Fix up file header. We'll add one section. Section header is
+ further away now. */
+
+ new_file_h->e_shoff += new_data2_size;
+ new_file_h->e_shnum += 1;
+
+#ifdef DEBUG
+ fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
+ fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
+ fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
+ fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
+#endif
+
+ /* Fix up a new program header. Extend the writable data segment so
+ that the bss area is covered too. Find that segment by looking
+ for a segment that ends just before the .bss area. Make sure
+ that no segments are above the new .data2. Put a loop at the end
+ to adjust the offset and address of any segment that is above
+ data2, just in case we decide to allow this later. */
+
+ for (n = new_file_h->e_phnum - 1; n >= 0; n--)
+ {
+ /* Compute maximum of all requirements for alignment of section. */
+ ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align;
+ if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
+ alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
+
+#ifdef __sgi
+ /* According to r02kar@x4u2.desy.de (Karsten Kuenne)
+ and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we
+ always get "Program segment above .bss" when dumping
+ when the executable doesn't have an sbss section. */
+ if (old_sbss_index != -1)
+#endif /* __sgi */
+ if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
+ > (old_sbss_index == -1
+ ? old_bss_addr
+ : round_up (old_bss_addr, alignment)))
+ fatal ("Program segment above .bss in %s\n", old_name, 0);
+
+ if (NEW_PROGRAM_H (n).p_type == PT_LOAD
+ && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
+ + (NEW_PROGRAM_H (n)).p_filesz,
+ alignment)
+ == round_up (old_bss_addr, alignment)))
+ break;
+ }
+ if (n < 0)
+ fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
+
+ /* Make sure that the size includes any padding before the old .bss
+ section. */
+ NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
+ NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
+
+#if 0 /* Maybe allow section after data2 - does this ever happen? */
+ for (n = new_file_h->e_phnum - 1; n >= 0; n--)
+ {
+ if (NEW_PROGRAM_H (n).p_vaddr
+ && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
+ NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
+
+ if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
+ NEW_PROGRAM_H (n).p_offset += new_data2_size;
+ }
+#endif
+
+ /* Fix up section headers based on new .data2 section. Any section
+ whose offset or virtual address is after the new .data2 section
+ gets its value adjusted. .bss size becomes zero and new address
+ is set. data2 section header gets added by copying the existing
+ .data header and modifying the offset, address and size. */
+ for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
+ old_data_index++)
+ if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
+ ".data"))
+ break;
+ if (old_data_index == old_file_h->e_shnum)
+ fatal ("Can't find .data in %s.\n", old_name, 0);
+
+ /* Walk through all section headers, insert the new data2 section right
+ before the new bss section. */
+ for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
+ {
+ caddr_t src;
+ /* If it is (s)bss section, insert the new data2 section before it. */
+ /* new_data2_index is the index of either old_sbss or old_bss, that was
+ chosen as a section for new_data2. */
+ if (n == new_data2_index)
+ {
+ /* Steal the data section header for this data2 section. */
+ memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
+ new_file_h->e_shentsize);
+
+ NEW_SECTION_H (nn).sh_addr = new_data2_addr;
+ NEW_SECTION_H (nn).sh_offset = new_data2_offset;
+ NEW_SECTION_H (nn).sh_size = new_data2_size;
+ /* Use the bss section's alignment. This will assure that the
+ new data2 section always be placed in the same spot as the old
+ bss section by any other application. */
+ NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
+
+ /* Now copy over what we have in the memory now. */
+ memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
+ (caddr_t) OLD_SECTION_H (n).sh_addr,
+ new_data2_size);
+ nn++;
+ }
+
+ memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
+ old_file_h->e_shentsize);
+
+ if (n == old_bss_index
+ /* The new bss and sbss section's size is zero, and its file offset
+ and virtual address should be off by NEW_DATA2_SIZE. */
+ || n == old_sbss_index || n == old_plt_index
+ )
+ {
+ /* NN should be `old_s?bss_index + 1' at this point. */
+ NEW_SECTION_H (nn).sh_offset =
+ NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size;
+ NEW_SECTION_H (nn).sh_addr =
+ NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size;
+ /* Let the new bss section address alignment be the same as the
+ section address alignment followed the old bss section, so
+ this section will be placed in exactly the same place. */
+ NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
+ NEW_SECTION_H (nn).sh_size = 0;
+ }
+ else
+ {
+ /* Any section that was originally placed after the .bss
+ section should now be off by NEW_DATA2_SIZE. If a
+ section overlaps the .bss section, consider it to be
+ placed after the .bss section. Overlap can occur if the
+ section just before .bss has less-strict alignment; this
+ was observed between .symtab and .bss on Solaris 2.5.1
+ (sparc) with GCC snapshot 960602. */
+#ifdef SOLARIS_POWERPC
+ /* On PPC Reference Platform running Solaris 2.5.1
+ the plt section is also of type NOBI like the bss section.
+ (not really stored) and therefore sections after the bss
+ section start at the plt offset. The plt section is always
+ the one just before the bss section.
+ It would be better to put the new data section before
+ the .plt section, or use libelf instead.
+ Erik Deumens, deumens@qtp.ufl.edu. */
+ if (NEW_SECTION_H (nn).sh_offset
+ >= OLD_SECTION_H (old_bss_index-1).sh_offset)
+ NEW_SECTION_H (nn).sh_offset += new_data2_size;
+#else
+ if (NEW_SECTION_H (nn).sh_offset + NEW_SECTION_H (nn).sh_size
+ > new_data2_offset)
+ NEW_SECTION_H (nn).sh_offset += new_data2_size;
+#endif
+ /* Any section that was originally placed after the section
+ header table should now be off by the size of one section
+ header table entry. */
+ if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
+ NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
+ }
+
+ /* If any section hdr refers to the section after the new .data
+ section, make it refer to next one because we have inserted
+ a new section in between. */
+
+ PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
+ /* For symbol tables, info is a symbol table index,
+ so don't change it. */
+ if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
+ && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
+ PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
+
+ if (old_sbss_index != -1)
+ if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".sbss"))
+ {
+ NEW_SECTION_H (nn).sh_offset =
+ round_up (NEW_SECTION_H (nn).sh_offset,
+ NEW_SECTION_H (nn).sh_addralign);
+ NEW_SECTION_H (nn).sh_type = SHT_PROGBITS;
+ }
+
+ /* Now, start to copy the content of sections. */
+ if (NEW_SECTION_H (nn).sh_type == SHT_NULL
+ || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
+ continue;
+
+ /* Write out the sections. .data and .data1 (and data2, called
+ ".data" in the strings table) get copied from the current process
+ instead of the old file. */
+ if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
+ || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
+ ".sdata")
+ || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
+ ".lit4")
+ || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
+ ".lit8")
+ /* The conditional bit below was in Oliva's original code
+ (1999-08-25) and seems to have been dropped by mistake
+ subsequently. It prevents a crash at startup under X in
+ `IRIX64 6.5 6.5.17m', whether compiled on that relase or
+ an earlier one. It causes no trouble on the other ELF
+ platforms I could test (Irix 6.5.15m, Solaris 8, Debian
+ Potato x86, Debian Woody SPARC); however, it's reported
+ to cause crashes under some version of GNU/Linux. It's
+ not yet clear what's changed in that Irix version to
+ cause the problem, or why the fix sometimes fails under
+ GNU/Linux. There's probably no good reason to have
+ something Irix-specific here, but this will have to do
+ for now. IRIX6_5 is the most specific macro we have to
+ test. -- fx 2002-10-01
+
+ The issue _looks_ as though it's gone away on 6.5.18m,
+ but maybe it's still lurking, to be triggered by some
+ change in the binary. It appears to concern the dynamic
+ loader, but I never got anywhere with an SGI support call
+ seeking clues. -- fx 2002-11-29. */
+#ifdef IRIX6_5
+ || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
+ ".got")
+#endif
+ || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
+ ".sdata1")
+ || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
+ ".data1")
+ || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
+ ".sbss"))
+ src = (caddr_t) OLD_SECTION_H (n).sh_addr;
+ else
+ src = old_base + OLD_SECTION_H (n).sh_offset;
+
+ memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
+ NEW_SECTION_H (nn).sh_size);
+
+#ifdef __alpha__
+ /* Update Alpha COFF symbol table: */
+ if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
+ == 0)
+ {
+ pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
+
+ symhdr->cbLineOffset += new_data2_size;
+ symhdr->cbDnOffset += new_data2_size;
+ symhdr->cbPdOffset += new_data2_size;
+ symhdr->cbSymOffset += new_data2_size;
+ symhdr->cbOptOffset += new_data2_size;
+ symhdr->cbAuxOffset += new_data2_size;
+ symhdr->cbSsOffset += new_data2_size;
+ symhdr->cbSsExtOffset += new_data2_size;
+ symhdr->cbFdOffset += new_data2_size;
+ symhdr->cbRfdOffset += new_data2_size;
+ symhdr->cbExtOffset += new_data2_size;
+ }
+#endif /* __alpha__ */
+
+#if defined (__sony_news) && defined (_SYSTYPE_SYSV)
+ if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG
+ && old_mdebug_index != -1)
+ {
+ int diff = NEW_SECTION_H(nn).sh_offset
+ - OLD_SECTION_H(old_mdebug_index).sh_offset;
+ HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
+
+ if (diff)
+ {
+ phdr->cbLineOffset += diff;
+ phdr->cbDnOffset += diff;
+ phdr->cbPdOffset += diff;
+ phdr->cbSymOffset += diff;
+ phdr->cbOptOffset += diff;
+ phdr->cbAuxOffset += diff;
+ phdr->cbSsOffset += diff;
+ phdr->cbSsExtOffset += diff;
+ phdr->cbFdOffset += diff;
+ phdr->cbRfdOffset += diff;
+ phdr->cbExtOffset += diff;
+ }
+ }
+#endif /* __sony_news && _SYSTYPE_SYSV */
+
+#if __sgi
+ /* Adjust the HDRR offsets in .mdebug and copy the
+ line data if it's in its usual 'hole' in the object.
+ Makes the new file debuggable with dbx.
+ patches up two problems: the absolute file offsets
+ in the HDRR record of .mdebug (see /usr/include/syms.h), and
+ the ld bug that gets the line table in a hole in the
+ elf file rather than in the .mdebug section proper.
+ David Anderson. davea@sgi.com Jan 16,1994. */
+ if (n == old_mdebug_index)
+ {
+#define MDEBUGADJUST(__ct,__fileaddr) \
+ if (n_phdrr->__ct > 0) \
+ { \
+ n_phdrr->__fileaddr += movement; \
+ }
+
+ HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset);
+ HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset);
+ unsigned movement = new_data2_size;
+
+ MDEBUGADJUST (idnMax, cbDnOffset);
+ MDEBUGADJUST (ipdMax, cbPdOffset);
+ MDEBUGADJUST (isymMax, cbSymOffset);
+ MDEBUGADJUST (ioptMax, cbOptOffset);
+ MDEBUGADJUST (iauxMax, cbAuxOffset);
+ MDEBUGADJUST (issMax, cbSsOffset);
+ MDEBUGADJUST (issExtMax, cbSsExtOffset);
+ MDEBUGADJUST (ifdMax, cbFdOffset);
+ MDEBUGADJUST (crfd, cbRfdOffset);
+ MDEBUGADJUST (iextMax, cbExtOffset);
+ /* The Line Section, being possible off in a hole of the object,
+ requires special handling. */
+ if (n_phdrr->cbLine > 0)
+ {
+ if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset
+ + OLD_SECTION_H (n).sh_size))
+ {
+ /* line data is in a hole in elf. do special copy and adjust
+ for this ld mistake.
+ */
+ n_phdrr->cbLineOffset += movement;
+
+ memcpy (n_phdrr->cbLineOffset + new_base,
+ o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
+ }
+ else
+ {
+ /* somehow line data is in .mdebug as it is supposed to be. */
+ MDEBUGADJUST (cbLine, cbLineOffset);
+ }
+ }
+ }
+#endif /* __sgi */
+
+ /* If it is the symbol table, its st_shndx field needs to be patched. */
+ if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
+ || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
+ {
+ ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
+ unsigned int num = spt->sh_size / spt->sh_entsize;
+ ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
+ new_base);
+ for (; num--; sym++)
+ {
+ if ((sym->st_shndx == SHN_UNDEF)
+ || (sym->st_shndx == SHN_ABS)
+ || (sym->st_shndx == SHN_COMMON))
+ continue;
+
+ PATCH_INDEX (sym->st_shndx);
+ }
+ }
+ }
+
+ /* Update the symbol values of _edata and _end. */
+ for (n = new_file_h->e_shnum - 1; n; n--)
+ {
+ byte *symnames;
+ ElfW(Sym) *symp, *symendp;
+
+ if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
+ && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
+ continue;
+
+ symnames = ((byte *) new_base
+ + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
+ symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
+ symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
+
+ for (; symp < symendp; symp ++)
+ if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
+ || strcmp ((char *) (symnames + symp->st_name), "end") == 0
+ || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
+ || strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
+ memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
+ }
+
+ /* This loop seeks out relocation sections for the data section, so
+ that it can undo relocations performed by the runtime linker. */
+#ifndef BROKEN_NOCOMBRELOC
+ for (n = new_file_h->e_shnum - 1; n; n--)
+ {
+ ElfW(Shdr) section = NEW_SECTION_H (n);
+
+ /* Cause a compilation error if anyone uses n instead of nn below. */
+ struct {int a;} n;
+ (void)n.a; /* Prevent `unused variable' warnings. */
+
+ switch (section.sh_type)
+ {
+ default:
+ break;
+ case SHT_REL:
+ case SHT_RELA:
+ /* This code handles two different size structs, but there should
+ be no harm in that provided that r_offset is always the first
+ member. */
+ nn = section.sh_info;
+ if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
+ || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
+ ".sdata")
+ || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
+ ".lit4")
+ || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
+ ".lit8")
+#ifdef IRIX6_5 /* see above */
+ || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
+ ".got")
+#endif
+ || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
+ ".sdata1")
+ || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
+ ".data1"))
+ {
+ ElfW(Addr) offset = (NEW_SECTION_H (nn).sh_addr
+ - NEW_SECTION_H (nn).sh_offset);
+ caddr_t reloc = old_base + section.sh_offset, end;
+ for (end = reloc + section.sh_size; reloc < end;
+ reloc += section.sh_entsize)
+ {
+ ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
+#ifdef __alpha__
+ /* The Alpha ELF binutils currently have a bug that
+ sometimes results in relocs that contain all
+ zeroes. Work around this for now... */
+ if (((ElfW(Rel) *) reloc)->r_offset == 0)
+ continue;
+#endif
+ memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
+ }
+ }
+ break;
+ }
+ }
+#else /* BROKEN_NOCOMBRELOC */
+ for (n = 1, n_unreloc_sections = 0; n < new_file_h->e_shnum; n++)
+ if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
+ || !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".sdata")
+ || !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".lit4")
+ || !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".lit8")
+#ifdef IRIX6_5 /* see above */
+ || !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".got")
+#endif
+ || !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".sdata1")
+ || !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data1"))
+ {
+ assert (n_unreloc_sections
+ < (sizeof (unreloc_sections) / sizeof (unreloc_sections[0])));
+ unreloc_sections[n_unreloc_sections++] = n;
+#ifdef DEBUG
+ fprintf (stderr, "section %d: %s\n", n,
+ old_section_names + NEW_SECTION_H (n).sh_name);
+#endif
+ }
+
+ for (n = new_file_h->e_shnum - 1; n; n--)
+ {
+ ElfW(Shdr) section = NEW_SECTION_H (n);
+ caddr_t reloc, end;
+ ElfW(Addr) addr, offset;
+ int target;
+
+ switch (section.sh_type)
+ {
+ default:
+ break;
+ case SHT_REL:
+ case SHT_RELA:
+ /* This code handles two different size structs, but there should
+ be no harm in that provided that r_offset is always the first
+ member. */
+ for (reloc = old_base + section.sh_offset,
+ end = reloc + section.sh_size;
+ reloc < end;
+ reloc += section.sh_entsize)
+ {
+ addr = ((ElfW(Rel) *) reloc)->r_offset;
+#ifdef __alpha__
+ /* The Alpha ELF binutils currently have a bug that
+ sometimes results in relocs that contain all
+ zeroes. Work around this for now... */
+ if (addr == 0)
+ continue;
+#endif
+ for (nn = 0; nn < n_unreloc_sections; nn++)
+ {
+ target = unreloc_sections[nn];
+ if (NEW_SECTION_H (target).sh_addr <= addr
+ && addr < (NEW_SECTION_H (target).sh_addr +
+ NEW_SECTION_H (target).sh_size))
+ {
+ offset = (NEW_SECTION_H (target).sh_addr -
+ NEW_SECTION_H (target).sh_offset);
+ memcpy (new_base + addr - offset,
+ old_base + addr - offset,
+ sizeof (ElfW(Addr)));
+#ifdef DEBUG
+ fprintf (stderr, "unrelocate: [%08lx] <= %08lx\n",
+ (long) addr,
+ (long) *((long *) (new_base + addr - offset)));
+#endif
+ break;
+ }
+ }
+ }
+ break;
+ }
+ }
+#endif /* BROKEN_NOCOMBRELOC */
+
+ /* Write out new_file, and free the buffers. */
+
+ if (write (new_file, new_base, new_file_size) != new_file_size)
+#ifndef emacs
+ fatal ("Didn't write %d bytes: errno %d\n",
+ new_file_size, errno);
+#else
+ fatal ("Didn't write %d bytes to %s: errno %d\n",
+ new_file_size, new_base, errno);
+#endif
+ munmap (old_base, old_file_size);
+ munmap (new_base, new_file_size);
+
+ /* Close the files and make the new file executable. */
+
+#if MAP_ANON == 0
+ close (mmap_fd);
+#endif
+
+ if (close (old_file))
+ fatal ("Can't close (%s): errno %d\n", old_name, errno);
+
+ if (close (new_file))
+ fatal ("Can't close (%s): errno %d\n", new_name, errno);
+
+ if (stat (new_name, &stat_buf) == -1)
+ fatal ("Can't stat (%s): errno %d\n", new_name, errno);
+
+ n = umask (777);
+ umask (n);
+ stat_buf.st_mode |= 0111 & ~n;
+ if (chmod (new_name, stat_buf.st_mode) == -1)
+ fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
+}
+
+/* arch-tag: e02e1512-95e2-4ef0-bba7-b6bce658f1e3
+ (do not change this comment) */
HCoop / bpt / emacs.git / blobdiff