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0
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1 /* Unexec for Siemens machines running Sinix (modified SVR4).
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2 Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993, 1994, 1995
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3 Free Software Foundation, Inc.
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4
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613
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5 This file is part of XEmacs.
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0
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6
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613
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7 XEmacs is free software; you can redistribute it and/or modify
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0
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 2, or (at your option)
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10 any later version.
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11
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613
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12 XEmacs is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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613
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA.
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21
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22 In other words, you are welcome to use, share and improve this program.
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23 You are forbidden to forbid anyone else to use, share and improve
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24 what you give them. Help stamp out software-hoarding! */
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25
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26 /* Synched up with: FSF 19.31. */
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27
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28 /*
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29 * unexec.c - Convert a running program into an a.out file.
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30 *
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31 * Author: Spencer W. Thomas
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32 * Computer Science Dept.
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33 * University of Utah
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34 * Date: Tue Mar 2 1982
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35 * Modified heavily since then.
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36 *
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37 * Synopsis:
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38 * unexec (new_name, a_name, data_start, bss_start, entry_address)
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39 * char *new_name, *a_name;
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40 * unsigned data_start, bss_start, entry_address;
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41 *
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42 * Takes a snapshot of the program and makes an a.out format file in the
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43 * file named by the string argument new_name.
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44 * If a_name is non-NULL, the symbol table will be taken from the given file.
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45 * On some machines, an existing a_name file is required.
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46 *
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47 * The boundaries within the a.out file may be adjusted with the data_start
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48 * and bss_start arguments. Either or both may be given as 0 for defaults.
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49 *
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50 * Data_start gives the boundary between the text segment and the data
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51 * segment of the program. The text segment can contain shared, read-only
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52 * program code and literal data, while the data segment is always unshared
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53 * and unprotected. Data_start gives the lowest unprotected address.
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54 * The value you specify may be rounded down to a suitable boundary
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55 * as required by the machine you are using.
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56 *
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57 * Specifying zero for data_start means the boundary between text and data
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58 * should not be the same as when the program was loaded.
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59 * If NO_REMAP is defined, the argument data_start is ignored and the
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60 * segment boundaries are never changed.
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61 *
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62 * Bss_start indicates how much of the data segment is to be saved in the
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63 * a.out file and restored when the program is executed. It gives the lowest
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64 * unsaved address, and is rounded up to a page boundary. The default when 0
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65 * is given assumes that the entire data segment is to be stored, including
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66 * the previous data and bss as well as any additional storage allocated with
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67 * break (2).
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68 *
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69 * The new file is set up to start at entry_address.
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70 *
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71 * If you make improvements I'd like to get them too.
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72 * harpo!utah-cs!thomas, thomas@Utah-20
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73 *
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74 */
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75
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76 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
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77 * ELF support added.
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78 *
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79 * Basic theory: the data space of the running process needs to be
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80 * dumped to the output file. Normally we would just enlarge the size
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81 * of .data, scooting everything down. But we can't do that in ELF,
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82 * because there is often something between the .data space and the
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83 * .bss space.
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84 *
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85 * In the temacs dump below, notice that the Global Offset Table
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86 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
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87 * .bss. It does not work to overlap .data with these fields.
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88 *
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89 * The solution is to create a new .data segment. This segment is
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90 * filled with data from the current process. Since the contents of
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91 * various sections refer to sections by index, the new .data segment
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92 * is made the last in the table to avoid changing any existing index.
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93 */
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94
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95 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
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96 *
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97 * The above mechanism does not work if the unexeced ELF file is being
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98 * re-layout by other applications (such as `strip'). All the applications
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99 * that re-layout the internal of ELF will layout all sections in ascending
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100 * order of their file offsets. After the re-layout, the data2 section will
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101 * still be the LAST section in the section header vector, but its file offset
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102 * is now being pushed far away down, and causes part of it not to be mapped
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103 * in (ie. not covered by the load segment entry in PHDR vector), therefore
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104 * causes the new binary to fail.
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105 *
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106 * The solution is to modify the unexec algorithm to insert the new data2
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107 * section header right before the new bss section header, so their file
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108 * offsets will be in the ascending order. Since some of the section's (all
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109 * sections AFTER the bss section) indexes are now changed, we also need to
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110 * modify some fields to make them point to the right sections. This is done
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111 * by macro PATCH_INDEX. All the fields that need to be patched are:
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112 *
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113 * 1. ELF header e_shstrndx field.
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114 * 2. section header sh_link and sh_info field.
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115 * 3. symbol table entry st_shndx field.
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116 */
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117
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118 /*
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119 * New modifications for Siemens Nixdorf's MIPS-based machines.
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120 * Marco.Walther@mch.sni.de
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121 *
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122 * The problem: Before the bss segment we have a so called sbss segment
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123 * (small bss) and maybe an sdata segment. These segments
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124 * must also be handled correct.
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125 *
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126 * /home1/marco/emacs/emacs-19.22/src
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127 * dump -hv temacs
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128 *
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129 * temacs:
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130 *
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131 * **** SECTION HEADER TABLE ****
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132 * [No] Type Flags Addr Offset Size Name
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133 * Link Info Adralgn Entsize
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134 *
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135 * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
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136 * 0 0 0x1 0
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137 *
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138 * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
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139 * 0 0 0x4 0x18
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140 *
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141 * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
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142 * 6 0 0x4 0x8
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143 *
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144 * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
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145 * 5 0 0x4 0x4
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146 *
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147 * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
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148 * 6 2 0x4 0x10
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149 *
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150 * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
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151 * 0 0 0x1 0
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152 *
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153 * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
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154 * 5 14 0x4 0x8
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155 *
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156 * [8] PBIT -AI- 0x402880 0x2880 0x60 .init
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157 * 0 0 0x10 0x1
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158 *
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159 * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
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160 * 0 0 0x4 0x4
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161 *
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162 * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
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163 * 0 0 0x20 0x1
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164 *
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165 * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
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166 * 0 0 0x10 0x1
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167 *
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168 * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
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169 * 0 0 0x10 0x1
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170 *
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171 * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
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172 * 0 0 0x10 0x1
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173 *
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771
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174 * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <----
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0
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175 * 0 0 0x10 0x1
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176 *
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177 * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
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178 * 0 0 0x4 0x4
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179 *
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771
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180 * [16] PBIT WA-G 0x582360 0x142360 0x10 .sdata <----
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0
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181 * 0 0 0x10 0x1
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182 *
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771
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183 * [17] NOBI WA-G 0x582370 0x142370 0xb84 .sbss <----
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0
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184 * 0 0 0x4 0
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185 *
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771
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186 * [18] NOBI WA-- 0x582f00 0x142370 0x27ec0 .bss <----
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0
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187 * 0 0 0x10 0x1
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188 *
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189 * [19] SYMT ---- 0 0x142370 0x10e40 .symtab
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190 * 20 1108 0x4 0x10
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191 *
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192 * [20] STRT ---- 0 0x1531b0 0xed9e .strtab
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193 * 0 0 0x1 0
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194 *
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195 * [21] STRT ---- 0 0x161f4e 0xb5 .shstrtab
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196 * 0 0 0x1 0
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197 *
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198 * [22] PBIT ---- 0 0x162003 0x28e2a .comment
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199 * 0 0 0x1 0x1
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200 *
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201 * [23] PBIT ---- 0 0x18ae2d 0x592 .debug
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202 * 0 0 0x1 0
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203 *
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204 * [24] PBIT ---- 0 0x18b3bf 0x80 .line
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205 * 0 0 0x1 0
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206 *
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207 * [25] MDBG ---- 0 0x18b440 0x60 .mdebug
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208 * 0 0 0x4 0
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209 *
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210 *
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211 * dump -hv emacs
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212 *
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213 * emacs:
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214 *
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215 * **** SECTION HEADER TABLE ****
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216 * [No] Type Flags Addr Offset Size Name
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217 * Link Info Adralgn Entsize
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218 *
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219 * [1] PBIT -A-- 0x4000f4 0xf4 0x13 .interp
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220 * 0 0 0x1 0
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221 *
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222 * [2] REGI -A-- 0x400108 0x108 0x18 .reginfo
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223 * 0 0 0x4 0x18
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224 *
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225 * [3] DYNM -A-- 0x400120 0x120 0xb8 .dynamic
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226 * 6 0 0x4 0x8
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227 *
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228 * [4] HASH -A-- 0x4001d8 0x1d8 0x8a0 .hash
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229 * 5 0 0x4 0x4
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230 *
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231 * [5] DYNS -A-- 0x400a78 0xa78 0x11f0 .dynsym
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232 * 6 2 0x4 0x10
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233 *
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234 * [6] STRT -A-- 0x401c68 0x1c68 0xbf9 .dynstr
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235 * 0 0 0x1 0
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236 *
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237 * [7] REL -A-- 0x402864 0x2864 0x18 .rel.dyn
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238 * 5 14 0x4 0x8
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239 *
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240 * [8] PBIT -AI- 0x402880 0x2880 0x60 .init
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241 * 0 0 0x10 0x1
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242 *
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243 * [9] PBIT -AI- 0x4028e0 0x28e0 0x1234 .plt
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244 * 0 0 0x4 0x4
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245 *
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246 * [10] PBIT -AI- 0x403b20 0x3b20 0xee400 .text
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247 * 0 0 0x20 0x1
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248 *
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249 * [11] PBIT -AI- 0x4f1f20 0xf1f20 0x60 .fini
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250 * 0 0 0x10 0x1
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251 *
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252 * [12] PBIT -A-- 0x4f1f80 0xf1f80 0xd90 .rdata
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253 * 0 0 0x10 0x1
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254 *
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255 * [13] PBIT -A-- 0x4f2d10 0xf2d10 0x17e0 .rodata
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256 * 0 0 0x10 0x1
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257 *
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771
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258 * [14] PBIT WA-- 0x5344f0 0xf44f0 0x4b3e4 .data <----
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0
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259 * 0 0 0x10 0x1
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260 *
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261 * [15] PBIT WA-G 0x57f8d4 0x13f8d4 0x2a84 .got
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262 * 0 0 0x4 0x4
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263 *
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771
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264 * [16] PBIT WA-G 0x582360 0x142360 0xb94 .sdata <----
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0
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265 * 0 0 0x10 0x1
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266 *
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771
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267 * [17] PBIT WA-- 0x582f00 0x142f00 0x94100 .data <----
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0
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268 * 0 0 0x10 0x1
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269 *
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771
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270 * [18] NOBI WA-G 0x617000 0x1d7000 0 .sbss <----
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0
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271 * 0 0 0x4 0
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272 *
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771
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273 * [19] NOBI WA-- 0x617000 0x1d7000 0 .bss <----
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0
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274 * 0 0 0x4 0x1
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275 *
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276 * [20] SYMT ---- 0 0x1d7000 0x10e40 .symtab
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277 * 21 1109 0x4 0x10
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278 *
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279 * [21] STRT ---- 0 0x1e7e40 0xed9e .strtab
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280 * 0 0 0x1 0
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281 *
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282 * [22] STRT ---- 0 0x1f6bde 0xb5 .shstrtab
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283 * 0 0 0x1 0
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284 *
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285 * [23] PBIT ---- 0 0x1f6c93 0x28e2a .comment
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286 * 0 0 0x1 0x1
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287 *
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288 * [24] PBIT ---- 0 0x21fabd 0x592 .debug
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289 * 0 0 0x1 0
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290 *
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291 * [25] PBIT ---- 0 0x22004f 0x80 .line
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292 * 0 0 0x1 0
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293 *
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294 * [26] MDBG ---- 0 0x2200d0 0x60 .mdebug
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295 * 0 0 0x4 0
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296 *
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297 */
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298
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299 #include <sys/types.h>
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300 #include <stdio.h>
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301 #include <sys/stat.h>
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302 #include <memory.h>
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303 #include <string.h>
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304 #include <errno.h>
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305 #include <unistd.h>
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306 #include <fcntl.h>
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307 #include <elf.h>
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308 #include <sys/mman.h>
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2286
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309 #include "compiler.h"
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0
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310
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311 #ifndef emacs
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312 #define fatal(a, b, c) fprintf(stderr, a, b, c), exit(1)
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313 #else
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314 extern void fatal(char *, ...);
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315 #endif
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316
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317 /* Get the address of a particular section or program header entry,
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318 * accounting for the size of the entries.
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319 */
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320
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321 #define OLD_SECTION_H(n) \
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322 (*(Elf32_Shdr *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
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323 #define NEW_SECTION_H(n) \
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324 (*(Elf32_Shdr *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
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325 #define OLD_PROGRAM_H(n) \
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326 (*(Elf32_Phdr *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
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327 #define NEW_PROGRAM_H(n) \
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328 (*(Elf32_Phdr *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
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329
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330 #define PATCH_INDEX(n) \
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331 do { \
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332 if ((n) >= old_sbss_index) \
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333 (n) += 1 + (old_sdata_index ? 0 : 1); } while (0)
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334
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335 typedef unsigned char byte;
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336
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337 /* Round X up to a multiple of Y. */
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338
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339 int
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340 round_up (x, y)
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341 int x, y;
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342 {
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343 int rem = x % y;
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344 if (rem == 0)
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345 return x;
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346 return x - rem + y;
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347 }
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348
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349 /* ****************************************************************
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350 * unexec
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351 *
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352 * driving logic.
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353 *
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354 * In ELF, this works by replacing the old .bss section with a new
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355 * .data section, and inserting an empty .bss immediately afterwards.
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356 *
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357 */
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358 void
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359 unexec (new_name, old_name, data_start, bss_start, entry_address)
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360 char *new_name, *old_name;
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2286
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361 unsigned UNUSED (data_start);
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362 unsigned UNUSED (bss_start);
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363 unsigned UNUSED (entry_address);
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0
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364 {
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365 extern unsigned int bss_end;
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366 int new_file, old_file, new_file_size;
|
|
|
367
|
|
|
368 /* Pointers to the base of the image of the two files. */
|
|
|
369 caddr_t old_base, new_base;
|
|
|
370
|
|
|
371 /* Pointers to the file, program and section headers for the old and new
|
|
|
372 * files.
|
|
|
373 */
|
|
|
374 Elf32_Ehdr *old_file_h, *new_file_h;
|
|
|
375 Elf32_Phdr *old_program_h, *new_program_h;
|
|
|
376 Elf32_Shdr *old_section_h, *new_section_h;
|
|
|
377
|
|
|
378 /* Point to the section name table in the old file */
|
|
|
379 char *old_section_names;
|
|
|
380
|
|
|
381 Elf32_Addr old_bss_addr, new_bss_addr;
|
|
|
382 Elf32_Addr old_sbss_addr;
|
|
|
383 Elf32_Word old_bss_size, new_data2_size;
|
|
|
384 Elf32_Word old_sbss_size, new_data3_size;
|
|
|
385 Elf32_Off new_data2_offset;
|
|
|
386 Elf32_Off new_data3_offset;
|
|
|
387 Elf32_Addr new_data2_addr;
|
|
|
388 Elf32_Addr new_data3_addr;
|
|
|
389
|
|
|
390 Elf32_Word old_sdata_size, new_sdata_size;
|
|
|
391 int old_sdata_index = 0;
|
|
|
392
|
|
|
393 int n, nn, old_data_index, new_data2_align;
|
|
|
394 int old_bss_index;
|
|
|
395 int old_sbss_index;
|
|
|
396 int old_bss_padding;
|
|
|
397 struct stat stat_buf;
|
|
|
398
|
|
|
399 /* Open the old file & map it into the address space. */
|
|
|
400
|
|
|
401 old_file = open (old_name, O_RDONLY);
|
|
|
402
|
|
|
403 if (old_file < 0)
|
|
|
404 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
|
|
|
405
|
|
|
406 if (fstat (old_file, &stat_buf) == -1)
|
|
|
407 fatal ("Can't fstat(%s): errno %d\n", old_name, errno);
|
|
|
408
|
|
|
409 old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
|
|
|
410
|
|
|
411 if (old_base == (caddr_t) -1)
|
|
|
412 fatal ("Can't mmap(%s): errno %d\n", old_name, errno);
|
|
|
413
|
|
|
414 #ifdef DEBUG
|
|
|
415 fprintf (stderr, "mmap(%s, %x) -> %x\n", old_name, stat_buf.st_size,
|
|
|
416 old_base);
|
|
|
417 #endif
|
|
|
418
|
|
|
419 /* Get pointers to headers & section names */
|
|
|
420
|
|
|
421 old_file_h = (Elf32_Ehdr *) old_base;
|
|
|
422 old_program_h = (Elf32_Phdr *) ((byte *) old_base + old_file_h->e_phoff);
|
|
|
423 old_section_h = (Elf32_Shdr *) ((byte *) old_base + old_file_h->e_shoff);
|
|
|
424 old_section_names = (char *) old_base
|
|
|
425 + OLD_SECTION_H(old_file_h->e_shstrndx).sh_offset;
|
|
|
426
|
|
|
427 /* Find the old .sbss section.
|
|
|
428 */
|
|
|
429
|
|
|
430 for (old_sbss_index = 1; old_sbss_index < old_file_h->e_shnum;
|
|
|
431 old_sbss_index++)
|
|
|
432 {
|
|
|
433 #ifdef DEBUG
|
|
|
434 fprintf (stderr, "Looking for .sbss - found %s\n",
|
|
|
435 old_section_names + OLD_SECTION_H(old_sbss_index).sh_name);
|
|
|
436 #endif
|
|
|
437 if (!strcmp (old_section_names + OLD_SECTION_H(old_sbss_index).sh_name,
|
|
|
438 ".sbss"))
|
|
|
439 break;
|
|
|
440 }
|
|
|
441 if (old_sbss_index == old_file_h->e_shnum)
|
|
|
442 fatal ("Can't find .sbss in %s.\n", old_name, 0);
|
|
|
443
|
|
|
444 if (!strcmp(old_section_names + OLD_SECTION_H(old_sbss_index - 1).sh_name,
|
|
|
445 ".sdata"))
|
|
|
446 {
|
|
|
447 old_sdata_index = old_sbss_index - 1;
|
|
|
448 }
|
|
|
449
|
|
|
450
|
|
|
451 /* Find the old .bss section.
|
|
|
452 */
|
|
|
453
|
|
|
454 for (old_bss_index = 1; old_bss_index < old_file_h->e_shnum; old_bss_index++)
|
|
|
455 {
|
|
|
456 #ifdef DEBUG
|
|
|
457 fprintf (stderr, "Looking for .bss - found %s\n",
|
|
|
458 old_section_names + OLD_SECTION_H(old_bss_index).sh_name);
|
|
|
459 #endif
|
|
|
460 if (!strcmp (old_section_names + OLD_SECTION_H(old_bss_index).sh_name,
|
|
|
461 ".bss"))
|
|
|
462 break;
|
|
|
463 }
|
|
|
464 if (old_bss_index == old_file_h->e_shnum)
|
|
|
465 fatal ("Can't find .bss in %s.\n", old_name, 0);
|
|
|
466
|
|
|
467 if (old_sbss_index != (old_bss_index - 1))
|
|
|
468 fatal (".sbss should come immediately before .bss in %s.\n", old_name, 0);
|
|
|
469
|
|
|
470 /* Figure out parameters of the new data3 and data2 sections.
|
|
|
471 * Change the sbss and bss sections.
|
|
|
472 */
|
|
|
473
|
|
|
474 old_bss_addr = OLD_SECTION_H(old_bss_index).sh_addr;
|
|
|
475 old_bss_size = OLD_SECTION_H(old_bss_index).sh_size;
|
|
|
476
|
|
|
477 old_sbss_addr = OLD_SECTION_H(old_sbss_index).sh_addr;
|
|
|
478 old_sbss_size = OLD_SECTION_H(old_sbss_index).sh_size;
|
|
|
479
|
|
|
480 if (old_sdata_index)
|
|
|
481 {
|
|
|
482 old_sdata_size = OLD_SECTION_H(old_sdata_index).sh_size;
|
|
|
483 }
|
|
|
484
|
|
|
485 #if defined(emacs) || !defined(DEBUG)
|
|
|
486 bss_end = (unsigned int) sbrk (0);
|
|
|
487 new_bss_addr = (Elf32_Addr) bss_end;
|
|
|
488 #else
|
|
|
489 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
|
|
|
490 #endif
|
|
|
491 if (old_sdata_index)
|
|
|
492 {
|
|
|
493 new_sdata_size = OLD_SECTION_H(old_sbss_index).sh_offset -
|
|
|
494 OLD_SECTION_H(old_sdata_index).sh_offset + old_sbss_size;
|
|
|
495 }
|
|
|
496
|
|
|
497 new_data3_addr = old_sbss_addr;
|
|
|
498 new_data3_size = old_sbss_size;
|
|
|
499 new_data3_offset = OLD_SECTION_H(old_sbss_index).sh_offset;
|
|
|
500
|
|
|
501 new_data2_addr = old_bss_addr;
|
|
|
502 new_data2_size = new_bss_addr - old_bss_addr;
|
|
|
503 new_data2_align = (new_data3_offset + old_sbss_size) %
|
|
|
504 OLD_SECTION_H(old_bss_index).sh_addralign;
|
|
|
505 new_data2_align = new_data2_align ?
|
|
|
506 OLD_SECTION_H(old_bss_index).sh_addralign - new_data2_align :
|
|
|
507 0;
|
|
|
508 new_data2_offset = new_data3_offset + old_sbss_size + new_data2_align;
|
|
|
509
|
|
|
510 old_bss_padding = OLD_SECTION_H(old_bss_index).sh_offset -
|
|
|
511 OLD_SECTION_H(old_sbss_index).sh_offset;
|
|
|
512 #ifdef DEBUG
|
|
|
513 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
|
|
|
514 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
|
|
|
515 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
|
|
|
516 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
|
|
|
517 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
|
|
|
518 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
|
|
|
519 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
|
|
|
520 fprintf (stderr, "old_sbss_index %d\n", old_sbss_index);
|
|
|
521 fprintf (stderr, "old_sbss_addr %x\n", old_sbss_addr);
|
|
|
522 fprintf (stderr, "old_sbss_size %x\n", old_sbss_size);
|
|
|
523 if (old_sdata_index)
|
|
|
524 {
|
|
|
525 fprintf (stderr, "old_sdata_size %x\n", old_sdata_size);
|
|
|
526 fprintf (stderr, "new_sdata_size %x\n", new_sdata_size);
|
|
|
527 }
|
|
|
528 else
|
|
|
529 {
|
|
|
530 fprintf (stderr, "new_data3_addr %x\n", new_data3_addr);
|
|
|
531 fprintf (stderr, "new_data3_size %x\n", new_data3_size);
|
|
|
532 fprintf (stderr, "new_data3_offset %x\n", new_data3_offset);
|
|
|
533 }
|
|
|
534 #endif
|
|
|
535
|
|
|
536 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
|
|
|
537 fatal (".bss shrank when undumping???\n", 0, 0);
|
|
|
538
|
|
|
539 /* Set the output file to the right size and mmap(2) it. Set
|
|
|
540 * pointers to various interesting objects. stat_buf still has
|
|
|
541 * old_file data.
|
|
|
542 */
|
|
|
543
|
|
|
544 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
|
|
|
545 if (new_file < 0)
|
|
|
546 fatal ("Can't creat(%s): errno %d\n", new_name, errno);
|
|
|
547
|
|
|
548 new_file_size = stat_buf.st_size +
|
|
|
549 ((1 + (old_sdata_index ? 0 : 1)) * old_file_h->e_shentsize) +
|
|
|
550 new_data2_size + new_data3_size + new_data2_align;
|
|
|
551
|
|
|
552 if (ftruncate (new_file, new_file_size))
|
|
|
553 fatal ("Can't ftruncate(%s): errno %d\n", new_name, errno);
|
|
|
554
|
|
|
555 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED,
|
|
|
556 new_file, 0);
|
|
|
557
|
|
|
558 if (new_base == (caddr_t) -1)
|
|
|
559 fatal ("Can't mmap(%s): errno %d\n", new_name, errno);
|
|
|
560
|
|
|
561 new_file_h = (Elf32_Ehdr *) new_base;
|
|
|
562 new_program_h = (Elf32_Phdr *) ((byte *) new_base + old_file_h->e_phoff);
|
|
|
563 new_section_h = (Elf32_Shdr *) ((byte *) new_base +
|
|
|
564 old_file_h->e_shoff +
|
|
|
565 new_data2_size +
|
|
|
566 new_data2_align +
|
|
|
567 new_data3_size);
|
|
|
568
|
|
|
569 /* Make our new file, program and section headers as copies of the
|
|
|
570 * originals.
|
|
|
571 */
|
|
|
572
|
|
|
573 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
|
|
|
574 memcpy (new_program_h, old_program_h,
|
|
|
575 old_file_h->e_phnum * old_file_h->e_phentsize);
|
|
|
576
|
|
|
577 /* Modify the e_shstrndx if necessary. */
|
|
|
578 PATCH_INDEX (new_file_h->e_shstrndx);
|
|
|
579
|
|
|
580 /* Fix up file header. We'll add one section. Section header is
|
|
|
581 * further away now.
|
|
|
582 */
|
|
|
583
|
|
|
584 new_file_h->e_shoff += new_data2_size + new_data2_align + new_data3_size;
|
|
|
585 new_file_h->e_shnum += 1 + (old_sdata_index ? 0 : 1);
|
|
|
586
|
|
|
587 #ifdef DEBUG
|
|
|
588 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
|
|
|
589 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
|
|
|
590 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
|
|
|
591 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
|
|
|
592 #endif
|
|
|
593
|
|
|
594 /* Fix up a new program header. Extend the writable data segment so
|
|
|
595 * that the bss area is covered too. Find that segment by looking
|
|
|
596 * for a segment that ends just before the .bss area. Make sure
|
|
|
597 * that no segments are above the new .data2. Put a loop at the end
|
|
|
598 * to adjust the offset and address of any segment that is above
|
|
|
599 * data2, just in case we decide to allow this later.
|
|
|
600 */
|
|
|
601
|
|
|
602 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
603 {
|
|
|
604 /* Compute maximum of all requirements for alignment of section. */
|
|
|
605 int alignment = (NEW_PROGRAM_H (n)).p_align;
|
|
|
606 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
|
|
|
607 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
|
|
|
608
|
|
|
609 if ((OLD_SECTION_H (old_sbss_index)).sh_addralign > alignment)
|
|
|
610 alignment = OLD_SECTION_H (old_sbss_index).sh_addralign;
|
|
|
611
|
|
|
612 /* Supposedly this condition is okay for the SGI. */
|
|
|
613 #if 0
|
|
|
614 if (NEW_PROGRAM_H(n).p_vaddr + NEW_PROGRAM_H(n).p_filesz > old_bss_addr)
|
|
|
615 fatal ("Program segment above .bss in %s\n", old_name, 0);
|
|
|
616 #endif
|
|
|
617
|
|
|
618 if (NEW_PROGRAM_H(n).p_type == PT_LOAD
|
|
|
619 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
|
|
|
620 + (NEW_PROGRAM_H (n)).p_filesz,
|
|
|
621 alignment)
|
|
|
622 == round_up (old_bss_addr, alignment)))
|
|
|
623 break;
|
|
|
624 }
|
|
|
625 if (n < 0)
|
|
|
626 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
|
|
|
627
|
|
|
628 NEW_PROGRAM_H(n).p_filesz += new_data2_size + new_data2_align +
|
|
|
629 new_data3_size;
|
|
|
630 NEW_PROGRAM_H(n).p_memsz = NEW_PROGRAM_H(n).p_filesz;
|
|
|
631
|
|
|
632 #if 1 /* Maybe allow section after data2 - does this ever happen? */
|
|
|
633 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
634 {
|
|
|
635 if (NEW_PROGRAM_H(n).p_vaddr
|
|
|
636 && NEW_PROGRAM_H(n).p_vaddr >= new_data3_addr)
|
|
|
637 NEW_PROGRAM_H(n).p_vaddr += new_data2_size - old_bss_size +
|
|
|
638 new_data3_size - old_sbss_size;
|
|
|
639
|
|
|
640 if (NEW_PROGRAM_H(n).p_offset >= new_data3_offset)
|
|
|
641 NEW_PROGRAM_H(n).p_offset += new_data2_size + new_data2_align +
|
|
|
642 new_data3_size;
|
|
|
643 }
|
|
|
644 #endif
|
|
|
645
|
|
|
646 /* Fix up section headers based on new .data2 section. Any section
|
|
|
647 * whose offset or virtual address is after the new .data2 section
|
|
|
648 * gets its value adjusted. .bss size becomes zero and new address
|
|
|
649 * is set. data2 section header gets added by copying the existing
|
|
|
650 * .data header and modifying the offset, address and size.
|
|
|
651 */
|
|
|
652 for (old_data_index = 1; old_data_index < old_file_h->e_shnum;
|
|
|
653 old_data_index++)
|
|
|
654 if (!strcmp (old_section_names + OLD_SECTION_H(old_data_index).sh_name,
|
|
|
655 ".data"))
|
|
|
656 break;
|
|
|
657 if (old_data_index == old_file_h->e_shnum)
|
|
|
658 fatal ("Can't find .data in %s.\n", old_name, 0);
|
|
|
659
|
|
|
660 /* Walk through all section headers, insert the new data2 section right
|
|
|
661 before the new bss section. */
|
|
|
662 for (n = 1, nn = 1; n < old_file_h->e_shnum; n++, nn++)
|
|
|
663 {
|
|
|
664 caddr_t src;
|
|
|
665
|
|
|
666 if (n == old_sbss_index)
|
|
|
667
|
|
|
668 /* If it is sbss section, insert the new data3 section before it. */
|
|
|
669 {
|
|
|
670 /* Steal the data section header for this data3 section. */
|
|
|
671 if (!old_sdata_index)
|
|
|
672 {
|
|
|
673 memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index),
|
|
|
674 new_file_h->e_shentsize);
|
|
|
675
|
|
|
676 NEW_SECTION_H(nn).sh_addr = new_data3_addr;
|
|
|
677 NEW_SECTION_H(nn).sh_offset = new_data3_offset;
|
|
|
678 NEW_SECTION_H(nn).sh_size = new_data3_size;
|
|
|
679 NEW_SECTION_H(nn).sh_flags = OLD_SECTION_H(n).sh_flags;
|
|
|
680 /* Use the sbss section's alignment. This will assure that the
|
|
|
681 new data3 section always be placed in the same spot as the old
|
|
|
682 sbss section by any other application. */
|
|
|
683 NEW_SECTION_H(nn).sh_addralign = OLD_SECTION_H(n).sh_addralign;
|
|
|
684
|
|
|
685 /* Now copy over what we have in the memory now. */
|
|
|
686 memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
|
|
|
687 (caddr_t) OLD_SECTION_H(n).sh_addr,
|
|
|
688 new_data3_size);
|
|
|
689 /* the new .data2 section should also come before the
|
|
|
690 * new .sbss section */
|
|
|
691 nn += 2;
|
|
|
692 }
|
|
|
693 else
|
|
|
694 {
|
|
|
695 /* We always have a .sdata section: append the contents of the
|
|
|
696 * old .sbss section.
|
|
|
697 */
|
|
|
698 memcpy (new_data3_offset + new_base,
|
|
|
699 (caddr_t) OLD_SECTION_H(n).sh_addr,
|
|
|
700 new_data3_size);
|
|
|
701 nn ++;
|
|
|
702 }
|
|
|
703 }
|
|
|
704 else if (n == old_bss_index)
|
|
|
705
|
|
|
706 /* If it is bss section, insert the new data2 section before it. */
|
|
|
707 {
|
|
|
708 Elf32_Word tmp_align;
|
|
|
709 Elf32_Addr tmp_addr;
|
|
|
710
|
|
|
711 tmp_align = OLD_SECTION_H(n).sh_addralign;
|
|
|
712 tmp_addr = OLD_SECTION_H(n).sh_addr;
|
|
|
713
|
|
|
714 nn -= 2;
|
|
|
715 /* Steal the data section header for this data2 section. */
|
|
|
716 memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(old_data_index),
|
|
|
717 new_file_h->e_shentsize);
|
|
|
718
|
|
|
719 NEW_SECTION_H(nn).sh_addr = new_data2_addr;
|
|
|
720 NEW_SECTION_H(nn).sh_offset = new_data2_offset;
|
|
|
721 NEW_SECTION_H(nn).sh_size = new_data2_size;
|
|
|
722 /* Use the bss section's alignment. This will assure that the
|
|
|
723 new data2 section always be placed in the same spot as the old
|
|
|
724 bss section by any other application. */
|
|
|
725 NEW_SECTION_H(nn).sh_addralign = tmp_align;
|
|
|
726
|
|
|
727 /* Now copy over what we have in the memory now. */
|
|
|
728 memcpy (NEW_SECTION_H(nn).sh_offset + new_base,
|
|
|
729 (caddr_t) tmp_addr, new_data2_size);
|
|
|
730 nn += 2;
|
|
|
731 }
|
|
|
732
|
|
|
733 memcpy (&NEW_SECTION_H(nn), &OLD_SECTION_H(n),
|
|
|
734 old_file_h->e_shentsize);
|
|
|
735
|
|
|
736 if (old_sdata_index && n == old_sdata_index)
|
|
|
737 /* The old .sdata section has now a new size */
|
|
|
738 NEW_SECTION_H(nn).sh_size = new_sdata_size;
|
|
|
739
|
|
|
740 /* The new bss section's size is zero, and its file offset and virtual
|
|
|
741 address should be off by NEW_DATA2_SIZE. */
|
|
|
742 if (n == old_sbss_index)
|
|
|
743 {
|
|
|
744 /* NN should be `old_sbss_index + 2' at this point. */
|
|
|
745 NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align +
|
|
|
746 new_data3_size;
|
|
|
747 NEW_SECTION_H(nn).sh_addr += new_data2_size + new_data2_align +
|
|
|
748 new_data3_size;
|
|
|
749 /* Let the new bss section address alignment be the same as the
|
|
|
750 section address alignment followed the old bss section, so
|
|
|
751 this section will be placed in exactly the same place. */
|
|
|
752 NEW_SECTION_H(nn).sh_addralign =
|
|
|
753 OLD_SECTION_H(nn + (old_sdata_index ? 1 : 0)).sh_addralign;
|
|
|
754 NEW_SECTION_H(nn).sh_size = 0;
|
|
|
755 }
|
|
|
756 else if (n == old_bss_index)
|
|
|
757 {
|
|
|
758 /* NN should be `old_bss_index + 2' at this point. */
|
|
|
759 NEW_SECTION_H(nn).sh_offset += new_data2_size + new_data2_align +
|
|
|
760 new_data3_size - old_bss_padding;
|
|
|
761 NEW_SECTION_H(nn).sh_addr += new_data2_size;
|
|
|
762 /* Let the new bss section address alignment be the same as the
|
|
|
763 section address alignment followed the old bss section, so
|
|
|
764 this section will be placed in exactly the same place. */
|
|
|
765 NEW_SECTION_H(nn).sh_addralign =
|
|
|
766 OLD_SECTION_H((nn - (old_sdata_index ? 0 : 1))).sh_addralign;
|
|
|
767 NEW_SECTION_H(nn).sh_size = 0;
|
|
|
768 }
|
|
|
769 /* Any section that was original placed AFTER the bss section should now
|
|
|
770 be off by NEW_DATA2_SIZE. */
|
|
|
771 else if (NEW_SECTION_H(nn).sh_offset >= new_data3_offset)
|
|
|
772 NEW_SECTION_H(nn).sh_offset += new_data2_size +
|
|
|
773 new_data2_align +
|
|
|
774 new_data3_size -
|
|
|
775 old_bss_padding;
|
|
|
776
|
|
|
777 /* If any section hdr refers to the section after the new .data
|
|
|
778 section, make it refer to next one because we have inserted
|
|
|
779 a new section in between. */
|
|
|
780
|
|
|
781 PATCH_INDEX(NEW_SECTION_H(nn).sh_link);
|
|
|
782 PATCH_INDEX(NEW_SECTION_H(nn).sh_info);
|
|
|
783
|
|
|
784 /* Now, start to copy the content of sections. */
|
|
|
785 if (NEW_SECTION_H(nn).sh_type == SHT_NULL
|
|
|
786 || NEW_SECTION_H(nn).sh_type == SHT_NOBITS)
|
|
|
787 continue;
|
|
|
788
|
|
|
789 /* Write out the sections. .data, .data1 and .sdata get copied from
|
|
|
790 * the current process instead of the old file.
|
|
|
791 */
|
|
|
792 if (!strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data") ||
|
|
|
793 !strcmp (old_section_names + OLD_SECTION_H(n).sh_name, ".data1") ||
|
|
|
794 (old_sdata_index && (n == old_sdata_index)))
|
|
|
795 src = (caddr_t) OLD_SECTION_H(n).sh_addr;
|
|
|
796 else
|
|
|
797 src = old_base + OLD_SECTION_H(n).sh_offset;
|
|
|
798
|
|
|
799 memcpy (NEW_SECTION_H(nn).sh_offset + new_base, src,
|
|
|
800 ((n == old_sdata_index) ?
|
|
|
801 old_sdata_size :
|
|
|
802 NEW_SECTION_H(nn).sh_size));
|
|
|
803
|
|
|
804 /* If it is the symbol table, its st_shndx field needs to be patched. */
|
|
|
805 if (NEW_SECTION_H(nn).sh_type == SHT_SYMTAB
|
|
|
806 || NEW_SECTION_H(nn).sh_type == SHT_DYNSYM)
|
|
|
807 {
|
|
|
808 Elf32_Shdr *spt = &NEW_SECTION_H(nn);
|
|
|
809 unsigned int num = spt->sh_size / spt->sh_entsize;
|
|
|
810 Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H(nn).sh_offset +
|
|
|
811 new_base);
|
|
|
812 for (; num--; sym++)
|
|
|
813 {
|
|
|
814 if ((sym->st_shndx == SHN_UNDEF)
|
|
|
815 || (sym->st_shndx == SHN_ABS)
|
|
|
816 || (sym->st_shndx == SHN_COMMON))
|
|
|
817 continue;
|
|
|
818
|
|
|
819 PATCH_INDEX(sym->st_shndx);
|
|
|
820 }
|
|
|
821 }
|
|
|
822 }
|
|
|
823
|
|
|
824 /* Close the files and make the new file executable */
|
|
|
825
|
|
|
826 if (close (old_file))
|
|
|
827 fatal ("Can't close(%s): errno %d\n", old_name, errno);
|
|
|
828
|
|
|
829 if (close (new_file))
|
|
|
830 fatal ("Can't close(%s): errno %d\n", new_name, errno);
|
|
|
831
|
|
|
832 if (stat (new_name, &stat_buf) == -1)
|
|
|
833 fatal ("Can't stat(%s): errno %d\n", new_name, errno);
|
|
|
834
|
|
|
835 n = umask (777);
|
|
|
836 umask (n);
|
|
|
837 stat_buf.st_mode |= 0111 & ~n;
|
|
|
838 if (chmod (new_name, stat_buf.st_mode) == -1)
|
|
|
839 fatal ("Can't chmod(%s): errno %d\n", new_name, errno);
|
|
|
840 }
|
