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[Emacs-diffs] Changes to src/unexsni.c
|
From: |
Dan Nicolaescu |
|
Subject: |
[Emacs-diffs] Changes to src/unexsni.c |
|
Date: |
Sun, 06 Jan 2008 00:57:44 +0000 |
CVSROOT: /cvsroot/emacs
Module name: emacs
Changes by: Dan Nicolaescu <dann> 08/01/06 00:56:56
Index: src/unexsni.c
===================================================================
RCS file: src/unexsni.c
diff -N src/unexsni.c
--- src/unexsni.c 26 Jul 2007 05:27:58 -0000 1.12
+++ /dev/null 1 Jan 1970 00:00:00 -0000
@@ -1,925 +0,0 @@
-/* Unexec for Siemens machines running Sinix (modified SVR4).
- Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993, 1994, 1995, 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, 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, address@hidden
- *
- */
-
-/* Even more heavily modified by address@hidden 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.
- */
-
-/* Modified by address@hidden 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.
- */
-
-/*
- * New modifications for Siemens Nixdorf's MIPS-based machines.
- * address@hidden
- * address@hidden
- *
- * The problem: Before the bss segment we have a so called sbss segment
- * (small bss) and maybe an sdata segment. These segments
- * must also be handled correct.
- *
- * /home1/marco/emacs/emacs-19.22/src
- * dump -hv temacs
- *
- * temacs:
- *
- * **** SECTION HEADER TABLE ****
- * [No] Type Flags Addr Offset Size Name
- * Link Info Adralgn Entsize
- *
- * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
- * 0 0 0x1 0
- *
- * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
- * 0 0 0x4 0x18
- *
- * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
- * 6 0 0x4 0x8
- *
- * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
- * 5 0 0x4 0x4
- *
- * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
- * 6 2 0x4 0x10
- *
- * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
- * 0 0 0x1 0
- *
- * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
- * 5 14 0x4 0x8
- *
- * [8] PBIT -AI- 0x402880 0x2880 0x60 .init
- * 0 0 0x10 0x1
- *
- * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
- * 0 0 0x4 0x4
- *
- * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
- * 0 0 0x20 0x1
- *
- * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
- * 0 0 0x10 0x1
- *
- * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
- * 0 0 0x10 0x1
- *
- * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
- * 0 0 0x10 0x1
- *
- * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data
<<<<<
- * 0 0 0x10 0x1
- *
- * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
- * 0 0 0x4 0x4
- *
- * [16] PBIT WA-G 0x582360 0x142360 0x10 .sdata
<<<<<
- * 0 0 0x10 0x1
- *
- * [17] NOBI WA-G 0x582370 0x142370 0xb84 .sbss
<<<<<
- * 0 0 0x4 0
- *
- * [18] NOBI WA-- 0x582f00 0x142370 0x27ec0 .bss
<<<<<
- * 0 0 0x10 0x1
- *
- * [19] SYMT ---- 0 0x142370 0x10e40 .symtab
- * 20 1108 0x4 0x10
- *
- * [20] STRT ---- 0 0x1531b0 0xed9e .strtab
- * 0 0 0x1 0
- *
- * [21] STRT ---- 0 0x161f4e 0xb5
.shstrtab
- * 0 0 0x1 0
- *
- * [22] PBIT ---- 0 0x162003 0x28e2a .comment
- * 0 0 0x1 0x1
- *
- * [23] PBIT ---- 0 0x18ae2d 0x592 .debug
- * 0 0 0x1 0
- *
- * [24] PBIT ---- 0 0x18b3bf 0x80 .line
- * 0 0 0x1 0
- *
- * [25] MDBG ---- 0 0x18b440 0x60 .mdebug
- * 0 0 0x4 0
- *
- *
- * dump -hv emacs
- *
- * emacs:
- *
- * **** SECTION HEADER TABLE ****
- * [No] Type Flags Addr Offset Size Name
- * Link Info Adralgn Entsize
- *
- * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
- * 0 0 0x1 0
- *
- * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
- * 0 0 0x4 0x18
- *
- * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
- * 6 0 0x4 0x8
- *
- * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
- * 5 0 0x4 0x4
- *
- * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
- * 6 2 0x4 0x10
- *
- * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
- * 0 0 0x1 0
- *
- * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
- * 5 14 0x4 0x8
- *
- * [8] PBIT -AI- 0x402880 0x2880 0x60 .init
- * 0 0 0x10 0x1
- *
- * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
- * 0 0 0x4 0x4
- *
- * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
- * 0 0 0x20 0x1
- *
- * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
- * 0 0 0x10 0x1
- *
- * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
- * 0 0 0x10 0x1
- *
- * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
- * 0 0 0x10 0x1
- *
- * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data
<<<<<
- * 0 0 0x10 0x1
- *
- * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
- * 0 0 0x4 0x4
- *
- * [16] PBIT WA-G 0x582360 0x142360 0xb94 .sdata
<<<<<
- * 0 0 0x10 0x1
- *
- * [17] PBIT WA-- 0x582f00 0x142f00 0x94100 .data
<<<<<
- * 0 0 0x10 0x1
- *
- * [18] NOBI WA-G 0x617000 0x1d7000 0 .sbss
<<<<<
- * 0 0 0x4 0
- *
- * [19] NOBI WA-- 0x617000 0x1d7000 0 .bss
<<<<<
- * 0 0 0x4 0x1
- *
- * [20] SYMT ---- 0 0x1d7000 0x10e40 .symtab
- * 21 1109 0x4 0x10
- *
- * [21] STRT ---- 0 0x1e7e40 0xed9e .strtab
- * 0 0 0x1 0
- *
- * [22] STRT ---- 0 0x1f6bde 0xb5
.shstrtab
- * 0 0 0x1 0
- *
- * [23] PBIT ---- 0 0x1f6c93 0x28e2a .comment
- * 0 0 0x1 0x1
- *
- * [24] PBIT ---- 0 0x21fabd 0x592 .debug
- * 0 0 0x1 0
- *
- * [25] PBIT ---- 0 0x22004f 0x80 .line
- * 0 0 0x1 0
- *
- * [26] MDBG ---- 0 0x2200d0 0x60 .mdebug
- * 0 0 0x4 0
- *
- */
-
-#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>
-#include <assert.h>
-
-/* #define DEBUG */
-
-#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_sbss_index) \
- (n) += 1 + (old_sdata_index ? 0 : 1); } 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_Addr old_sbss_addr;
- Elf32_Word old_bss_size, new_data2_size;
- Elf32_Word old_sbss_size, new_data3_size;
- Elf32_Off new_data2_offset;
- Elf32_Off new_data3_offset;
- Elf32_Addr new_data2_addr;
- Elf32_Addr new_data3_addr;
-
-
- Elf32_Addr old_rel_dyn_addr;
- Elf32_Word old_rel_dyn_size;
- int old_rel_dyn_index;
-
- Elf32_Word old_sdata_size, new_sdata_size;
- int old_sdata_index = 0;
-
- int n, nn, old_data_index, new_data2_align;
- int old_bss_index;
- int old_sbss_index;
- int old_bss_padding;
- 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 .sbss section.
- */
-
- for (old_sbss_index = 1; old_sbss_index < old_file_h->e_shnum;
- old_sbss_index++)
- {
-#ifdef DEBUG
- fprintf (stderr, "Looking for .sbss - found %s\n",
- old_section_names + OLD_SECTION_H(old_sbss_index).sh_name);
-#endif
- if (!strcmp (old_section_names + OLD_SECTION_H(old_sbss_index).sh_name,
- ".sbss"))
- break;
- }
- if (old_sbss_index == old_file_h->e_shnum)
- fatal ("Can't find .sbss in %s.\n", old_name, 0);
-
- if (!strcmp(old_section_names + OLD_SECTION_H(old_sbss_index - 1).sh_name,
- ".sdata"))
- {
- old_sdata_index = old_sbss_index - 1;
- }
-
-
- /* Find the old .bss section.
- */
-
- 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);
-
- if (old_sbss_index != (old_bss_index - 1))
- fatal (".sbss should come immediately before .bss in %s.\n", old_name, 0);
-
- /* Find the old .rel.dyn section.
- */
-
- for (old_rel_dyn_index = 1; old_rel_dyn_index < old_file_h->e_shnum;
- old_rel_dyn_index++)
- {
-#ifdef DEBUG
- fprintf (stderr, "Looking for .rel.dyn - found %s\n",
- old_section_names + OLD_SECTION_H(old_rel_dyn_index).sh_name);
-#endif
- if (!strcmp (old_section_names +
OLD_SECTION_H(old_rel_dyn_index).sh_name,
- ".rel.dyn"))
- break;
- }
- if (old_rel_dyn_index == old_file_h->e_shnum)
- fatal ("Can't find .rel_dyn in %s.\n", old_name, 0);
-
- old_rel_dyn_addr = OLD_SECTION_H(old_rel_dyn_index).sh_addr;
- old_rel_dyn_size = OLD_SECTION_H(old_rel_dyn_index).sh_size;
-
- /* Figure out parameters of the new data3 and data2 sections.
- * Change the sbss and bss sections.
- */
-
- old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
- old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
-
- old_sbss_addr = OLD_SECTION_H(old_sbss_index).sh_addr;
- old_sbss_size = OLD_SECTION_H(old_sbss_index).sh_size;
-
- if (old_sdata_index)
- {
- old_sdata_size = OLD_SECTION_H(old_sdata_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
- if (old_sdata_index)
- {
- new_sdata_size = OLD_SECTION_H(old_sbss_index).sh_offset -
- OLD_SECTION_H(old_sdata_index).sh_offset + old_sbss_size;
- }
-
- new_data3_addr = old_sbss_addr;
- new_data3_size = old_sbss_size;
- new_data3_offset = OLD_SECTION_H(old_sbss_index).sh_offset;
-
- new_data2_addr = old_bss_addr;
- new_data2_size = new_bss_addr - old_bss_addr;
- new_data2_align = (new_data3_offset + old_sbss_size) %
- OLD_SECTION_H(old_bss_index).sh_addralign;
- new_data2_align = new_data2_align ?
- OLD_SECTION_H(old_bss_index).sh_addralign - new_data2_align
:
- 0;
- new_data2_offset = new_data3_offset + old_sbss_size + new_data2_align;
-
- old_bss_padding = OLD_SECTION_H(old_bss_index).sh_offset -
- OLD_SECTION_H(old_sbss_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);
- fprintf (stderr, "old_sbss_index %d\n", old_sbss_index);
- fprintf (stderr, "old_sbss_addr %x\n", old_sbss_addr);
- fprintf (stderr, "old_sbss_size %x\n", old_sbss_size);
- fprintf (stderr, "old_rel_dyn_addr %x\n", old_rel_dyn_addr);
- fprintf (stderr, "old_rel_dyn_size %x\n", old_rel_dyn_size);
- if (old_sdata_index)
- {
- fprintf (stderr, "old_sdata_size %x\n", old_sdata_size);
- fprintf (stderr, "new_sdata_size %x\n", new_sdata_size);
- }
- else
- {
- fprintf (stderr, "new_data3_addr %x\n", new_data3_addr);
- fprintf (stderr, "new_data3_size %x\n", new_data3_size);
- fprintf (stderr, "new_data3_offset %x\n", new_data3_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 +
- ((1 + (old_sdata_index ? 0 : 1)) * old_file_h->e_shentsize) +
- new_data2_size + new_data3_size + new_data2_align;
-
- 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 +
- new_data2_align +
- new_data3_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_data2_align + new_data3_size;
- new_file_h->e_shnum += 1 + (old_sdata_index ? 0 : 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 ((OLD_SECTION_H (old_sbss_index)).sh_addralign > alignment)
- alignment = OLD_SECTION_H (old_sbss_index).sh_addralign;
-
- /* Supposedly this condition is okay for the SGI. */
-#if 0
- 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);
-#endif
-
- 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_data2_align +
- new_data3_size;
- NEW_PROGRAM_H(n).p_memsz = NEW_PROGRAM_H(n).p_filesz;
-
-#if 1 /* 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_data3_addr)
- NEW_PROGRAM_H(n).p_vaddr += new_data2_size - old_bss_size +
- new_data3_size - old_sbss_size;
-
- if (NEW_PROGRAM_H(n).p_offset >= new_data3_offset)
- NEW_PROGRAM_H(n).p_offset += new_data2_size + new_data2_align +
- new_data3_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 (n == old_sbss_index)
-
- /* If it is sbss section, insert the new data3 section before it. */
- {
- /* Steal the data section header for this data3 section. */
- if (!old_sdata_index)
- {
- memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index),
- new_file_h->e_shentsize);
-
- NEW_SECTION_H(nn).sh_addr = new_data3_addr;
- NEW_SECTION_H(nn).sh_offset = new_data3_offset;
- NEW_SECTION_H(nn).sh_size = new_data3_size;
- NEW_SECTION_H(nn).sh_flags = OLD_SECTION_H(n).sh_flags;
- /* Use the sbss section's alignment. This will assure that the
- new data3 section always be placed in the same spot as the old
- sbss 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_data3_size);
- /* the new .data2 section should also come before the
- * new .sbss section */
- nn += 2;
- }
- else
- {
- /* We always have a .sdata section: append the contents of the
- * old .sbss section.
- */
- memcpy (new_data3_offset + new_base,
- (caddr_t) OLD_SECTION_H(n).sh_addr,
- new_data3_size);
- nn ++;
- }
- }
- else if (n == old_bss_index)
-
- /* If it is bss section, insert the new data2 section before it. */
- {
- Elf32_Word tmp_align;
- Elf32_Addr tmp_addr;
-
- tmp_align = OLD_SECTION_H(n).sh_addralign;
- tmp_addr = OLD_SECTION_H(n).sh_addr;
-
- nn -= 2;
- /* 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 = tmp_align;
-
- /* Now copy over what we have in the memory now. */
- memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
- (caddr_t) tmp_addr, new_data2_size);
- nn += 2;
- }
-
- memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(n),
- old_file_h->e_shentsize);
-
- if (old_sdata_index && n == old_sdata_index)
- /* The old .sdata section has now a new size */
- NEW_SECTION_H(nn).sh_size = new_sdata_size;
-
- /* 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_sbss_index)
- {
- /* NN should be `old_sbss_index + 2' at this point. */
- NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align +
- new_data3_size;
- NEW_SECTION_H(nn).sh_addr += new_data2_size + new_data2_align +
- new_data3_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 + (old_sdata_index ? 1 : 0)).sh_addralign;
- NEW_SECTION_H(nn).sh_size = 0;
- }
- else if (n == old_bss_index)
- {
- /* NN should be `old_bss_index + 2' at this point. */
- NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align +
- new_data3_size - old_bss_padding;
- 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 - (old_sdata_index ? 0 : 1))).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_data3_offset)
- NEW_SECTION_H(nn).sh_offset += new_data2_size +
- new_data2_align +
- new_data3_size -
- old_bss_padding;
-
- /* 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, .data1 and .sdata get copied from
- * the current process instead of the old file.
- */
- if (!strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data") ||
- !strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data1") ||
- (old_sdata_index && (n == old_sdata_index)))
- 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,
- ((n == old_sdata_index) ?
- old_sdata_size :
- 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);
- }
- }
- }
- {
- Elf32_Rel *rel_p;
- unsigned int old_data_addr_start;
- unsigned int old_data_addr_end;
- unsigned int old_data_offset;
- unsigned int new_data_offset;
- int i;
-
- rel_p = (Elf32_Rel *)OLD_SECTION_H(old_rel_dyn_index).sh_addr;
- old_data_addr_start = OLD_SECTION_H(old_data_index).sh_addr;
- old_data_addr_end = old_data_addr_start +
- OLD_SECTION_H(old_data_index).sh_size;
- old_data_offset = (int)OLD_SECTION_H(old_data_index).sh_offset +
- (unsigned int)old_base;
- new_data_offset = (int)NEW_SECTION_H(old_data_index).sh_offset +
- (unsigned int)new_base;
-
-#ifdef DEBUG
- fprintf(stderr, "old_data.sh_addr= 0x%08x ... 0x%08x\n",
old_data_addr_start,
- old_data_addr_end);
-#endif /* DEBUG */
-
- for (i = 0; i < old_rel_dyn_size/sizeof(Elf32_Rel); i++)
- {
-#ifdef DEBUG
- fprintf(stderr, ".rel.dyn offset= 0x%08x type= %d sym= %d\n",
- rel_p->r_offset, ELF32_R_TYPE(rel_p->r_info),
ELF32_R_SYM(rel_p->r_info));
-#endif /* DEBUG */
-
- if (rel_p->r_offset)
- {
- unsigned int offset;
-
- assert(old_data_addr_start <= rel_p->r_offset &&
- rel_p->r_offset <= old_data_addr_end);
-
- offset = rel_p->r_offset - old_data_addr_start;
-
-#ifdef DEBUG
- fprintf(stderr, "r_offset= 0x%08x *r_offset= 0x%08x\n",
- rel_p->r_offset, *((int *)(rel_p->r_offset)));
- fprintf(stderr, "old = 0x%08x *old =0x%08x\n",
- (old_data_offset + offset - (unsigned int)old_base),
- *((int *)(old_data_offset + offset)));
- fprintf(stderr, "new = 0x%08x *new =0x%08x\n",
- (new_data_offset + offset - (unsigned int)new_base),
- *((int *)(new_data_offset + offset)));
-#endif /* DEBUG */
-
- *((int *)(new_data_offset + offset)) = *((int *)(old_data_offset +
offset));
- }
-
- rel_p++;
- }
- }
-
- /* 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);
-}
-
-/* arch-tag: c784ead3-7a27-442b-83fe-7af8d08654d3
- (do not change this comment) */
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- [Emacs-diffs] Changes to src/unexsni.c,
Dan Nicolaescu <=