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1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000
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2 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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428
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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10
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613
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11 XEmacs is distributed in the hope that it will be useful, but
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12 WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to the
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18 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA.
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20
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21 In other words, you are welcome to use, share and improve this
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22 program. You are forbidden to forbid anyone else to use, share and
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23 improve what you give them. Help stamp out software-hoarding! */
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24
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25
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26 /*
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27 * unexec.c - Convert a running program into an a.out file.
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28 *
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29 * Author: Spencer W. Thomas
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30 * Computer Science Dept.
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31 * University of Utah
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32 * Date: Tue Mar 2 1982
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33 * Modified heavily since then.
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34 *
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35 * Synopsis:
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36 * void
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37 * unexec (char *new_name,
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38 * char *old_name,
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39 * uintptr_t data_start,
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40 * uintptr_t bss_start,
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41 * uintptr_t entry_address)
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428
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42 *
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446
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43 * The basic idea is that we start with an ELF file which contains
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44 * .bss (uninitialized global data) section which is normally not in
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45 * the file. As we load lisp the variables, which were first set to 0,
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46 * will change their values. We want to save those changed values into
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47 * another ELF file, which will become a new xemacs image. To do this,
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48 * we need to change several structures in the ELF file.
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428
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49 *
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50 * First of all, we need to change the programm header which tells
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51 * the linker how to load stuff into memory so that data will come
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52 * from the file and not from the /dev/zero. To do this, we find the
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53 * segment, which is marked as loadable (type PT_LOAD) and which
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54 * covers the old .bss section. We will next change the filesz and
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55 * memsz for that segment to extend over the new data section.
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428
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56 *
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57 * Next we have to make sure that section header for the stuff which
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58 * used to be uninitialized is changed to be initialized and to come
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59 * from the file. To do this, we change the size and the type of the old
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60 * .bss section (and all other section of the type SHT_NOBITS) to cover the
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61 * new section and to be of type SHT_PROCBITS.
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62 *
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63 * We also insert a new SHT_NOBITS section to keep some tools, which expect
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64 * .bss happy.
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428
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65 *
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446
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66 * Finally we need to patch up some references to the section
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67 * indexes since we change the order and undo the relocation info to
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68 * be the same as it was "before" because we actually used the data
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69 * from the memory which were changed by the run-time linker.
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428
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70 */
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71
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72 #ifndef emacs
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73 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
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74 #include <string.h>
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75 #else
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76 #include <config.h>
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77 extern void fatal (const char *, ...);
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78 #endif
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79
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80 #include <sys/types.h>
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81 #include <stdio.h>
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82 #include <sys/stat.h>
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83 #include <memory.h>
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84 #include <errno.h>
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85 #include <unistd.h>
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86 #include <fcntl.h>
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446
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87 #ifdef HAVE_ELF_H
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428
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88 #include <elf.h>
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444
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89 #endif
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428
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90 #include <sys/mman.h>
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444
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91 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
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92 #include <sys/elf_mips.h>
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93 #include <sym.h>
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94 #endif /* __sony_news && _SYSTYPE_SYSV */
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95 #if __sgi
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96 #include <syms.h> /* for HDRR declaration */
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97 #endif /* __sgi */
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98
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99 #if __GNU_LIBRARY__ - 0 >= 6
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100 # include <link.h> /* get ElfW etc */
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101 #endif
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102
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2286
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103 #include "compiler.h"
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104
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444
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105 #ifndef ElfW
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106 # ifdef __STDC__
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107 # define ElfBitsW(bits, type) Elf##bits##_##type
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108 # else
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109 # define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type
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110 # endif
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111 # ifdef _LP64
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112 # define ELFSIZE 64
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113 # else
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114 # define ELFSIZE 32
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115 # endif
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116 /* This macro expands `bits' before invoking ElfBitsW. */
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117 # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type)
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118 # define ElfW(type) ElfExpandBitsW (ELFSIZE, type)
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119 #endif
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120
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121 #ifndef ELF_BSS_SECTION_NAME
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122 #define ELF_BSS_SECTION_NAME ".bss"
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123 #endif
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124
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125 /* Get the address of a particular section or program header entry,
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126 * accounting for the size of the entries. */
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428
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127
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128 #define OLD_SECTION_H(n) \
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444
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129 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
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130 #define NEW_SECTION_H(n) \
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131 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
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132 #define OLD_PROGRAM_H(n) \
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133 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
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428
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134 #define NEW_PROGRAM_H(n) \
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135 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
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428
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136
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137 #define PATCH_INDEX(n) \
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138 do { \
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139 if ((int) (n) >= growme_index) \
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140 (n)++; } while (0)
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446
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141
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428
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142 typedef unsigned char byte;
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143
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144 /* Round X up to a multiple of Y. */
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145
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444
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146 static ElfW(Addr)
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147 round_up (ElfW(Addr) x, ElfW(Addr) y)
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428
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148 {
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149 int rem = x % y;
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150 if (rem == 0)
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151 return x;
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152 return x - rem + y;
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153 }
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154
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155 /* Return the index of the section named NAME.
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156 SECTION_NAMES, FILE_NAME and FILE_H give information
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157 about the file we are looking in.
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158
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159 If we don't find the section NAME, that is a fatal error
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160 if NOERROR is 0; we return -1 if NOERROR is nonzero. */
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161
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162 static int
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163 find_section (char *name,
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446
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164 const char *section_names,
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428
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165 char *file_name,
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166 ElfW(Ehdr) *old_file_h,
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167 ElfW(Shdr) *old_section_h,
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428
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168 int noerror)
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169 {
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170 int idx;
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171
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172 for (idx = 1; idx < old_file_h->e_shnum; idx++)
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173 {
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174 #ifdef DEBUG
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175 fprintf (stderr, "Looking for %s - found %s\n", name,
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176 section_names + OLD_SECTION_H (idx).sh_name);
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177 #endif
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178 if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
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179 name))
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446
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180 return idx;
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181 }
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182
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446
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183 /* If we're here, we found nothing or return did not work */
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184 if ( ! noerror)
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185 fatal ("Can't find %s in %s.\n", name, file_name);
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186
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187 return -1;
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428
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188 }
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189
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190 /* ****************************************************************
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191 * unexec
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192 *
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193 * driving logic.
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194 *
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195 * In ELF, this works by replacing the old .bss section with a new
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196 * .data section, and inserting an empty .bss immediately afterwards.
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197 *
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198 */
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444
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199 void
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428
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200 unexec (char *new_name,
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201 char *old_name,
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2286
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202 uintptr_t UNUSED (data_start),
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203 uintptr_t UNUSED (bss_start),
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204 uintptr_t UNUSED (entry_address))
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428
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205 {
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446
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206 int old_file;
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428
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207
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446
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208 struct stat stat_buf;
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428
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209 caddr_t old_base, new_base;
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210
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446
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211 ElfW(Ehdr) *old_file_h, * new_file_h;
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212 ElfW(Phdr) *old_program_h, * new_program_h;
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213 ElfW(Shdr) *old_section_h, * new_section_h;
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214 ElfW(Shdr) * growme = NULL, * grown = NULL;
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215 ElfW(Addr) old_bss_addr = 0, new_data2_addr = 0;
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428
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216
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446
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217 int growme_index = -1;
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444
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218 int n, nn;
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446
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219 const char *old_section_names;
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220 int old_mdebug_index, old_data_index;
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221 int new_bss_addr, new_data2_size, new_data2_offset, new_file, new_file_size;
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428
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222
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446
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223 /* Open the old file */
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224 if ( (old_file = open (old_name, O_RDONLY)) < 0 )
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225 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
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428
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226
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227 if (fstat (old_file, &stat_buf) == -1)
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446
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228 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
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428
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229
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446
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230 /* map old file into the address space. */
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448
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231 old_base = (caddr_t) mmap ((caddr_t) 0, stat_buf.st_size,
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232 PROT_READ, MAP_SHARED, old_file, 0);
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233 if (old_base == (caddr_t) MAP_FAILED)
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234 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
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428
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235
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446
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236 old_file_h = (ElfW(Ehdr) *) old_base;
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444
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237 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
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238 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
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446
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239 old_section_names = (const char *) old_base
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240 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
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428
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241
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446
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242 /* Find a section which we will grow by looking for the SHT_NOBITS
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243 * section with ALLOCATE flag and with the biggest address. */
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244 for (n = 1; n < old_file_h->e_shnum; n++) {
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245 ElfW(Shdr) * sh = & OLD_SECTION_H(n);
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428
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246
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446
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247 if ((sh->sh_type == SHT_NOBITS) && (sh->sh_flags & SHF_ALLOC)) {
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248 if ( old_bss_addr < sh->sh_addr ) {
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249 growme = sh;
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250 growme_index = n;
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251 new_data2_addr = old_bss_addr = sh->sh_addr;
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252 }
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253 }
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254 }
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428
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255
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446
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256 if (growme == NULL )
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257 fatal ("Can't find a section to grow\n", 0, 0);
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428
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258
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259 old_data_index = find_section (".data", old_section_names,
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260 old_name, old_file_h, old_section_h, 0);
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261
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444
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262 new_bss_addr = (ElfW(Addr)) sbrk (0);
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263 new_data2_size = new_bss_addr - old_bss_addr;
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428
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264 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
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446
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265 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
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428
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266
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446
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267 if ( new_bss_addr < old_bss_addr + growme->sh_size )
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268 fatal (".bss shrank when undumping???\n", 0, 0);
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428
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269
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446
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270 /* Set the output file to the right size and mmap it. */
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271 if ( (new_file = open (new_name, O_RDWR | O_CREAT, 0666)) < 0 )
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272 fatal ("Can't create (%s): errno %d\n", new_name, errno);
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428
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273
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446
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274 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
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428
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275
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276 if (ftruncate (new_file, new_file_size))
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446
|
277 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
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428
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278
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444
|
279 new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size,
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280 PROT_READ | PROT_WRITE,
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446
|
281 #ifdef UNEXEC_USE_MAP_PRIVATE
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282 MAP_PRIVATE,
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444
|
283 #else
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446
|
284 MAP_SHARED,
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444
|
285 #endif
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|
446
|
286 new_file, 0);
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428
|
287
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|
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288 if (new_base == (caddr_t) -1)
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|
446
|
289 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
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|
428
|
290
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|
444
|
291 new_file_h = (ElfW(Ehdr) *) new_base;
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|
|
292 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
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446
|
293 new_section_h = (ElfW(Shdr) *) ((byte *) new_base + old_file_h->e_shoff +
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|
|
294 new_data2_size);
|
|
428
|
295
|
|
|
296 /* Make our new file, program and section headers as copies of the
|
|
446
|
297 * originals. */
|
|
428
|
298 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
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|
|
299 memcpy (new_program_h, old_program_h,
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300 old_file_h->e_phnum * old_file_h->e_phentsize);
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301
|
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302 /* Modify the e_shstrndx if necessary. */
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303 PATCH_INDEX (new_file_h->e_shstrndx);
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304
|
|
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305 /* Fix up file header. We'll add one section. Section header is
|
|
446
|
306 * further away now. */
|
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444
|
307 new_file_h->e_shoff += new_data2_size;
|
|
428
|
308 new_file_h->e_shnum += 1;
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|
|
309
|
|
446
|
310 /* Fix up a new program header by extending the writable data
|
|
|
311 * segment so that the bss area is covered too. Find that segment by
|
|
|
312 * looking for one that starts before and ends after the .bss and is
|
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|
313 * PT_LOADable. */
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|
314 for (n = new_file_h->e_phnum - 1; n >= 0; n--) {
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|
|
315 ElfW(Phdr) * ph = & NEW_PROGRAM_H(n);
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|
428
|
316 #ifdef DEBUG
|
|
446
|
317 printf ("%d @ %0x + %0x against %0x + %0x",
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|
|
318 n, ph->p_vaddr, ph->p_memsz,growme->sh_addr, growme->sh_size);
|
|
428
|
319 #endif
|
|
446
|
320 if ((ph->p_type == PT_LOAD) &&
|
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|
321 (ph->p_vaddr <= growme->sh_addr) &&
|
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|
322 ((ph->p_vaddr+ph->p_memsz) >= (growme->sh_addr + growme->sh_size))) {
|
|
|
323 /* Make sure that the size includes any padding before the
|
|
|
324 * old .bss section. */
|
|
|
325 ph->p_memsz = ph->p_filesz = new_bss_addr - ph->p_vaddr;
|
|
|
326 #ifdef DEBUG
|
|
|
327 puts (" That's the one!");
|
|
|
328 #endif
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|
|
329 break;
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|
|
330 }
|
|
|
331 #ifdef DEBUG
|
|
|
332 putchar ('\n');
|
|
|
333 #endif
|
|
|
334 }
|
|
428
|
335
|
|
446
|
336 if (n < 0)
|
|
|
337 fatal ("Couldn't find segment which covers %s",
|
|
|
338 old_section_names + growme->sh_name);
|
|
428
|
339
|
|
446
|
340 /* Walk through all section headers, insert the new data2 section
|
|
|
341 * right before the new bss section. */
|
|
|
342 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) {
|
|
|
343 ElfW(Shdr) * nsec = & NEW_SECTION_H(nn);
|
|
|
344 ElfW(Shdr) * osec = & OLD_SECTION_H(n);
|
|
428
|
345
|
|
446
|
346 /* If this is the section we want to grow, insert the new data
|
|
|
347 * section before it. */
|
|
|
348 if ( osec == growme ) {
|
|
|
349 /* Steal the data section header for this data2 section but
|
|
|
350 * use the * 'grow' section's alignment. This * will assure
|
|
|
351 * that the new section * always be placed in the same spot
|
|
|
352 * * as the old section by any other * application. */
|
|
|
353 ElfW(Shdr) * od = &OLD_SECTION_H(old_data_index);
|
|
444
|
354
|
|
446
|
355 memcpy (nsec, od, new_file_h->e_shentsize);
|
|
428
|
356
|
|
446
|
357 nsec->sh_addr = new_data2_addr;
|
|
|
358 nsec->sh_offset = new_data2_offset;
|
|
|
359 nsec->sh_size = new_data2_size;
|
|
|
360 nsec->sh_addralign = osec->sh_addralign;
|
|
|
361
|
|
|
362 /* Copy over what we have in memory now. */
|
|
|
363 memcpy (nsec->sh_offset + new_base, (caddr_t) osec->sh_addr,
|
|
428
|
364 new_data2_size);
|
|
|
365 nn++;
|
|
446
|
366 grown = nsec++;
|
|
|
367 }
|
|
|
368
|
|
|
369 memcpy (nsec, osec, old_file_h->e_shentsize);
|
|
444
|
370
|
|
446
|
371 if ( osec == growme ) {
|
|
|
372 /* The new bss section's size is zero, and its file offset
|
|
|
373 * and virtual address should be off by NEW_DATA2_SIZE. */
|
|
|
374 nsec->sh_offset = grown->sh_offset + new_data2_size;
|
|
|
375 nsec->sh_addr = grown->sh_addr + new_data2_size;
|
|
444
|
376
|
|
446
|
377 /* Let the new bss section address alignment be the same as
|
|
|
378 * the section address alignment followed the old bss
|
|
|
379 * section, so this section will be placed in exactly the
|
|
|
380 * same place. */
|
|
|
381 nsec->sh_addralign = osec->sh_addralign;
|
|
|
382 nsec->sh_size = 0;
|
|
|
383 } else {
|
|
|
384 /* Any section that was originally placed AFTER the bss
|
|
|
385 * section should now be off by NEW_DATA2_SIZE. */
|
|
|
386 if ( round_up (nsec->sh_offset, growme->sh_addralign) >=
|
|
|
387 new_data2_offset)
|
|
|
388 nsec->sh_offset += new_data2_size;
|
|
|
389 }
|
|
|
390
|
|
|
391 /* Any section that was originally placed after the section *
|
|
|
392 * header table should now be off by the size of one section
|
|
|
393 * header table entry. */
|
|
|
394 if (nsec->sh_offset > new_file_h->e_shoff)
|
|
|
395 nsec->sh_offset += new_file_h->e_shentsize;
|
|
|
396
|
|
428
|
397
|
|
|
398 /* If any section hdr refers to the section after the new .data
|
|
446
|
399 * section, make it refer to next one because we have inserted a
|
|
|
400 * new section in between. */
|
|
|
401 PATCH_INDEX (nsec->sh_link);
|
|
|
402
|
|
|
403 /* For symbol tables, info is a symbol table index, so don't
|
|
|
404 * change it. */
|
|
|
405 if (nsec->sh_type != SHT_SYMTAB && nsec->sh_type != SHT_DYNSYM)
|
|
|
406 PATCH_INDEX (nsec->sh_info);
|
|
|
407
|
|
|
408 /* Any section which used to be NOBITS will now becomes PROGBITS
|
|
|
409 * if it's ALLOC-atable, unless, of cause, it's not the one we
|
|
|
410 * decided to grow */
|
|
|
411 if ( (osec->sh_type == SHT_NOBITS) && (osec->sh_flags & SHF_ALLOC) &&
|
|
|
412 (osec != growme ) ) {
|
|
|
413 nsec->sh_type = SHT_PROGBITS;
|
|
|
414 }
|
|
444
|
415
|
|
446
|
416 /* Now, start to copy the content of sections */
|
|
|
417 if ( nsec->sh_type != SHT_NULL || nsec->sh_type != SHT_NOBITS ) {
|
|
428
|
418
|
|
446
|
419 /* Write out the sections. .data and .data1 (and data2,
|
|
|
420 * called ".data" in the strings table) get copied from the
|
|
|
421 * current process instead of the old file. */
|
|
|
422 caddr_t src = old_base + osec->sh_offset;
|
|
|
423 const char * secname = old_section_names + nsec->sh_name;
|
|
|
424 const char * names[] = {
|
|
|
425 ".data",".sdata", ".lit4", ".lit8", ".sdata1", ".data1",
|
|
|
426 ".sbss", NULL};
|
|
|
427 int i;
|
|
|
428
|
|
|
429 for ( i=0; names[i] != NULL; i++ ) {
|
|
|
430 if ( ! strcmp (secname, names[i]) ) {
|
|
|
431 src = (caddr_t) osec->sh_addr;
|
|
|
432 break;
|
|
|
433 }
|
|
444
|
434 }
|
|
|
435
|
|
446
|
436 memcpy (nsec->sh_offset + new_base, src, nsec->sh_size);
|
|
|
437 }
|
|
444
|
438
|
|
446
|
439 old_mdebug_index = find_section (".mdebug", old_section_names,
|
|
|
440 old_name, old_file_h, old_section_h, 1);
|
|
444
|
441
|
|
|
442 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
|
|
446
|
443 if (nsec->sh_type == SHT_MIPS_DEBUG && old_mdebug_index != -1) {
|
|
|
444 int diff = nsec->sh_offset-OLD_SECTION_H(old_mdebug_index).sh_offset;
|
|
|
445 HDRR *phdr = (HDRR *)(nsec->sh_offset + new_base);
|
|
444
|
446
|
|
446
|
447 if (diff) {
|
|
444
|
448 phdr->cbLineOffset += diff;
|
|
|
449 phdr->cbDnOffset += diff;
|
|
|
450 phdr->cbPdOffset += diff;
|
|
|
451 phdr->cbSymOffset += diff;
|
|
|
452 phdr->cbOptOffset += diff;
|
|
|
453 phdr->cbAuxOffset += diff;
|
|
|
454 phdr->cbSsOffset += diff;
|
|
|
455 phdr->cbSsExtOffset += diff;
|
|
|
456 phdr->cbFdOffset += diff;
|
|
|
457 phdr->cbRfdOffset += diff;
|
|
|
458 phdr->cbExtOffset += diff;
|
|
446
|
459 }
|
|
|
460 }
|
|
444
|
461 #endif /* __sony_news && _SYSTYPE_SYSV */
|
|
|
462
|
|
|
463 #if __sgi
|
|
446
|
464 /* Adjust the HDRR offsets in .mdebug and copy the line data if
|
|
|
465 * it's in its usual 'hole' in the object. Makes the new file
|
|
|
466 * debuggable with dbx. patches up two problems: the absolute
|
|
|
467 * file offsets in the HDRR record of .mdebug (see
|
|
|
468 * /usr/include/syms.h), and the ld bug that gets the line table
|
|
|
469 * in a hole in the elf file rather than in the .mdebug section
|
|
|
470 * proper.
|
|
|
471 *
|
|
|
472 * David Anderson. davea@sgi.com Jan 16,1994 */
|
|
428
|
473 #define MDEBUGADJUST(__ct,__fileaddr) \
|
|
|
474 if (n_phdrr->__ct > 0) \
|
|
|
475 { \
|
|
|
476 n_phdrr->__fileaddr += movement; \
|
|
|
477 }
|
|
|
478
|
|
446
|
479 if (n == old_mdebug_index) {
|
|
|
480 HDRR * o_phdrr = (HDRR *)((byte *)old_base + osec->sh_offset);
|
|
|
481 HDRR * n_phdrr = (HDRR *)((byte *)new_base + nsec->sh_offset);
|
|
444
|
482 unsigned movement = new_data2_size;
|
|
428
|
483
|
|
|
484 MDEBUGADJUST (idnMax, cbDnOffset);
|
|
|
485 MDEBUGADJUST (ipdMax, cbPdOffset);
|
|
|
486 MDEBUGADJUST (isymMax, cbSymOffset);
|
|
|
487 MDEBUGADJUST (ioptMax, cbOptOffset);
|
|
|
488 MDEBUGADJUST (iauxMax, cbAuxOffset);
|
|
|
489 MDEBUGADJUST (issMax, cbSsOffset);
|
|
|
490 MDEBUGADJUST (issExtMax, cbSsExtOffset);
|
|
|
491 MDEBUGADJUST (ifdMax, cbFdOffset);
|
|
|
492 MDEBUGADJUST (crfd, cbRfdOffset);
|
|
|
493 MDEBUGADJUST (iextMax, cbExtOffset);
|
|
446
|
494
|
|
|
495 /* The Line Section, being possible off in a hole of the
|
|
|
496 * object, requires special handling. */
|
|
|
497 if (n_phdrr->cbLine > 0) {
|
|
|
498 if (o_phdrr->cbLineOffset >
|
|
|
499 osec->sh_offset+ osec->sh_size){
|
|
|
500 /* line data is in a hole in elf. do special copy
|
|
|
501 * and adjust for this ld mistake. */
|
|
428
|
502 n_phdrr->cbLineOffset += movement;
|
|
|
503
|
|
|
504 memcpy (n_phdrr->cbLineOffset + new_base,
|
|
|
505 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
|
|
446
|
506 } else {
|
|
|
507 /* somehow line data is in .mdebug as it is supposed
|
|
|
508 * to be. */
|
|
428
|
509 MDEBUGADJUST (cbLine, cbLineOffset);
|
|
446
|
510 }
|
|
|
511 }
|
|
|
512 }
|
|
444
|
513 #endif /* __sgi */
|
|
446
|
514 /* If it is the symbol table, its st_shndx field needs to be
|
|
|
515 * patched. */
|
|
|
516 if (nsec->sh_type == SHT_SYMTAB || nsec->sh_type == SHT_DYNSYM) {
|
|
|
517 unsigned int num = nsec->sh_size / nsec->sh_entsize;
|
|
|
518 ElfW(Sym) * sym = (ElfW(Sym) *)(nsec->sh_offset + new_base);
|
|
|
519 byte *symnames = ((byte *) new_base +
|
|
|
520 NEW_SECTION_H (nsec->sh_link).sh_offset);
|
|
428
|
521
|
|
446
|
522 for (; num--; sym++) {
|
|
|
523 const char * symnam = (char *) (symnames + sym->st_name);
|
|
|
524
|
|
|
525 /* Update the symbol values of _edata and _end. */
|
|
|
526 if (strcmp (symnam, "_end") == 0
|
|
|
527 || strcmp (symnam, "end") == 0
|
|
|
528 || strcmp (symnam, "_edata") == 0
|
|
|
529 || strcmp (symnam, "edata") == 0)
|
|
|
530 memcpy (&sym->st_value, &new_bss_addr,sizeof (new_bss_addr));
|
|
|
531
|
|
|
532
|
|
|
533 if ((sym->st_shndx == SHN_UNDEF) || (sym->st_shndx == SHN_ABS)
|
|
|
534 || (sym->st_shndx == SHN_COMMON)
|
|
|
535 || (sym->st_shndx >= SHN_LOPROC &&
|
|
|
536 sym->st_shndx <= SHN_HIPROC))
|
|
|
537 continue;
|
|
444
|
538
|
|
428
|
539 PATCH_INDEX (sym->st_shndx);
|
|
446
|
540 }
|
|
|
541 }
|
|
|
542 }
|
|
444
|
543
|
|
|
544 /* This loop seeks out relocation sections for the data section, so
|
|
446
|
545 * that it can undo relocations performed by the runtime linker. */
|
|
|
546 for (n = new_file_h->e_shnum - 1; n; n--) {
|
|
444
|
547 ElfW(Shdr) section = NEW_SECTION_H (n);
|
|
446
|
548
|
|
|
549 if ( section.sh_type == SHT_REL || section.sh_type == SHT_RELA ) {
|
|
|
550 /* This code handles two different size structs, but there
|
|
|
551 * should be no harm in that provided that r_offset is
|
|
|
552 * always the first member. */
|
|
|
553 ElfW(Shdr) * info = & NEW_SECTION_H(section.sh_info);
|
|
|
554 const char * nm = old_section_names + info->sh_name;
|
|
|
555
|
|
|
556 if (!strcmp (nm, ".data") || !strcmp (nm, ".sdata")
|
|
|
557 || !strcmp (nm, ".lit4") || !strcmp (nm, ".lit8")
|
|
|
558 || !strcmp (nm, ".sdata1") || !strcmp (nm, ".data1")) {
|
|
|
559 ElfW(Addr) offset = info->sh_addr - info->sh_offset;
|
|
|
560 caddr_t end, reloc = old_base + section.sh_offset;
|
|
|
561
|
|
|
562 for (end = reloc + section.sh_size; reloc < end;
|
|
|
563 reloc += section.sh_entsize) {
|
|
|
564 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
|
|
444
|
565 #ifdef __alpha__
|
|
446
|
566 /* The Alpha ELF binutils currently have a bug that
|
|
|
567 * sometimes results in relocs that contain all
|
|
|
568 * zeroes. Work around this for now... */
|
|
|
569 if (((ElfW(Rel) *) reloc)->r_offset == 0)
|
|
|
570 continue;
|
|
444
|
571 #endif
|
|
446
|
572 memcpy (new_base + addr, old_base + addr,
|
|
|
573 sizeof(ElfW(Addr)));
|
|
444
|
574 }
|
|
|
575 }
|
|
|
576 }
|
|
446
|
577 }
|
|
444
|
578
|
|
|
579 #ifdef UNEXEC_USE_MAP_PRIVATE
|
|
|
580 if (lseek (new_file, 0, SEEK_SET) == -1)
|
|
446
|
581 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
|
|
444
|
582
|
|
|
583 if (write (new_file, new_base, new_file_size) != new_file_size)
|
|
446
|
584 fatal ("Can't write (%s): errno %d\n", new_name, errno);
|
|
444
|
585 #endif
|
|
|
586
|
|
428
|
587 /* Close the files and make the new file executable. */
|
|
|
588 if (close (old_file))
|
|
446
|
589 fatal ("Can't close (%s): errno %d\n", old_name, errno);
|
|
428
|
590
|
|
|
591 if (close (new_file))
|
|
446
|
592 fatal ("Can't close (%s): errno %d\n", new_name, errno);
|
|
428
|
593
|
|
|
594 if (stat (new_name, &stat_buf) == -1)
|
|
446
|
595 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
|
|
428
|
596
|
|
|
597 n = umask (777);
|
|
|
598 umask (n);
|
|
|
599 stat_buf.st_mode |= 0111 & ~n;
|
|
|
600 if (chmod (new_name, stat_buf.st_mode) == -1)
|
|
446
|
601 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
|
|
428
|
602 }
|
