--- /dev/null
+/* Unexec for Siemens machines running Sinix (modified SVR4).
+ Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993, 1994
+ 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.
+ */
+
+/* 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.
+ */
+
+/*
+ * New modifications for Siemens Nixdorf's MIPS-based machines.
+ * Marco.Walther@mch.sni.de
+ *
+ * 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
+ *
+ */
+\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_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_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 immediatly before .bss in %s.\n", old_name, 0);
+
+ /* 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);
+ 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);
+ }
+ }
+ }
+
+ /* 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);
+}
projects / emacs.git / commitdiff