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1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1993
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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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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 the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 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
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18 the 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 /* Synched up with: FSF 19.31. */
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22
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23 /*
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24 * unexec.c - Convert a running program into an a.out file.
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25 *
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26 * Author: Spencer W. Thomas
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27 * Computer Science Dept.
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28 * University of Utah
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29 * Date: Tue Mar 2 1982
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30 * Modified heavily since then.
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31 *
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32 * Synopsis:
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33 * unexec (new_name, a_name, data_start, bss_start, entry_address)
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34 * char *new_name, *a_name;
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35 * unsigned data_start, bss_start, entry_address;
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36 *
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37 * Takes a snapshot of the program and makes an a.out format file in the
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38 * file named by the string argument new_name.
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39 * If a_name is non-NULL, the symbol table will be taken from the given file.
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40 * On some machines, an existing a_name file is required.
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41 *
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42 * The boundaries within the a.out file may be adjusted with the data_start
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43 * and bss_start arguments. Either or both may be given as 0 for defaults.
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44 *
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45 * Data_start gives the boundary between the text segment and the data
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46 * segment of the program. The text segment can contain shared, read-only
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47 * program code and literal data, while the data segment is always unshared
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48 * and unprotected. Data_start gives the lowest unprotected address.
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49 * The value you specify may be rounded down to a suitable boundary
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50 * as required by the machine you are using.
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51 *
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52 * Specifying zero for data_start means the boundary between text and data
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53 * should not be the same as when the program was loaded.
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54 * If NO_REMAP is defined, the argument data_start is ignored and the
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55 * segment boundaries are never changed.
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56 *
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57 * Bss_start indicates how much of the data segment is to be saved in the
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58 * a.out file and restored when the program is executed. It gives the lowest
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59 * unsaved address, and is rounded up to a page boundary. The default when 0
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60 * is given assumes that the entire data segment is to be stored, including
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61 * the previous data and bss as well as any additional storage allocated with
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62 * break (2).
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63 *
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64 * The new file is set up to start at entry_address.
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65 *
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66 * If you make improvements I'd like to get them too.
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67 * harpo!utah-cs!thomas, thomas@Utah-20
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68 *
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69 */
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70
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71 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
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72 * ELF support added.
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73 *
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74 * Basic theory: the data space of the running process needs to be
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75 * dumped to the output file. Normally we would just enlarge the size
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76 * of .data, scooting everything down. But we can't do that in ELF,
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77 * because there is often something between the .data space and the
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78 * .bss space.
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79 *
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80 * In the temacs dump below, notice that the Global Offset Table
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81 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
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82 * .bss. It does not work to overlap .data with these fields.
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83 *
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84 * The solution is to create a new .data segment. This segment is
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85 * filled with data from the current process. Since the contents of
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86 * various sections refer to sections by index, the new .data segment
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87 * is made the last in the table to avoid changing any existing index.
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88
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89 * This is an example of how the section headers are changed. "Addr"
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90 * is a process virtual address. "Offset" is a file offset.
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91
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92 raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
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93
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94 temacs:
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95
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96 **** SECTION HEADER TABLE ****
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97 [No] Type Flags Addr Offset Size Name
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98 Link Info Adralgn Entsize
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99
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100 [1] 1 2 0x80480d4 0xd4 0x13 .interp
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101 0 0 0x1 0
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102
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103 [2] 5 2 0x80480e8 0xe8 0x388 .hash
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104 3 0 0x4 0x4
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105
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106 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
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107 4 1 0x4 0x10
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108
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109 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
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110 0 0 0x1 0
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111
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112 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
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113 3 7 0x4 0x8
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114
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115 [6] 1 6 0x8049348 0x1348 0x3 .init
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116 0 0 0x4 0
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117
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118 [7] 1 6 0x804934c 0x134c 0x680 .plt
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119 0 0 0x4 0x4
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120
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121 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
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122 0 0 0x4 0
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123
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124 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
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125 0 0 0x4 0
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126
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127 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
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128 0 0 0x4 0
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129
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130 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
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131 0 0 0x4 0
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132
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133 [12] 1 3 0x8088330 0x3f330 0x20afc .data
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134 0 0 0x4 0
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135
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136 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
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137 0 0 0x4 0
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138
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139 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
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140 0 0 0x4 0x4
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141
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142 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
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143 4 0 0x4 0x8
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144
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145 [16] 8 3 0x80a98f4 0x608f4 0x449c .bss
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146 0 0 0x4 0
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147
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148 [17] 2 0 0 0x608f4 0x9b90 .symtab
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149 18 371 0x4 0x10
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150
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151 [18] 3 0 0 0x6a484 0x8526 .strtab
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152 0 0 0x1 0
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153
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154 [19] 3 0 0 0x729aa 0x93 .shstrtab
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155 0 0 0x1 0
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156
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157 [20] 1 0 0 0x72a3d 0x68b7 .comment
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158 0 0 0x1 0
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159
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160 raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
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161
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162 xemacs:
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163
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164 **** SECTION HEADER TABLE ****
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165 [No] Type Flags Addr Offset Size Name
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166 Link Info Adralgn Entsize
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167
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168 [1] 1 2 0x80480d4 0xd4 0x13 .interp
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169 0 0 0x1 0
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170
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171 [2] 5 2 0x80480e8 0xe8 0x388 .hash
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172 3 0 0x4 0x4
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173
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174 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
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175 4 1 0x4 0x10
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176
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177 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
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178 0 0 0x1 0
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179
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180 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
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181 3 7 0x4 0x8
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182
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183 [6] 1 6 0x8049348 0x1348 0x3 .init
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184 0 0 0x4 0
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185
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186 [7] 1 6 0x804934c 0x134c 0x680 .plt
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187 0 0 0x4 0x4
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188
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189 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
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190 0 0 0x4 0
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191
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192 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
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193 0 0 0x4 0
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194
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195 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
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196 0 0 0x4 0
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197
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198 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
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199 0 0 0x4 0
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200
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201 [12] 1 3 0x8088330 0x3f330 0x20afc .data
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202 0 0 0x4 0
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203
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204 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
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205 0 0 0x4 0
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206
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207 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
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208 0 0 0x4 0x4
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209
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210 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
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211 4 0 0x4 0x8
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212
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213 [16] 8 3 0x80c6800 0x7d800 0 .bss
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214 0 0 0x4 0
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215
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216 [17] 2 0 0 0x7d800 0x9b90 .symtab
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217 18 371 0x4 0x10
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218
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219 [18] 3 0 0 0x87390 0x8526 .strtab
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220 0 0 0x1 0
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221
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222 [19] 3 0 0 0x8f8b6 0x93 .shstrtab
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223 0 0 0x1 0
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224
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225 [20] 1 0 0 0x8f949 0x68b7 .comment
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226 0 0 0x1 0
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227
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228 [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
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229 0 0 0x4 0
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230
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231 * This is an example of how the file header is changed. "Shoff" is
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232 * the section header offset within the file. Since that table is
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233 * after the new .data section, it is moved. "Shnum" is the number of
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234 * sections, which we increment.
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235 *
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236 * "Phoff" is the file offset to the program header. "Phentsize" and
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237 * "Shentsz" are the program and section header entries sizes respectively.
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238 * These can be larger than the apparent struct sizes.
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239
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240 raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
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241
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242 temacs:
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243
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244 **** ELF HEADER ****
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245 Class Data Type Machine Version
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246 Entry Phoff Shoff Flags Ehsize
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247 Phentsize Phnum Shentsz Shnum Shstrndx
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248
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249 1 1 2 3 1
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250 0x80499cc 0x34 0x792f4 0 0x34
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251 0x20 5 0x28 21 19
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252
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253 raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
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254
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255 xemacs:
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256
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257 **** ELF HEADER ****
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258 Class Data Type Machine Version
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259 Entry Phoff Shoff Flags Ehsize
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260 Phentsize Phnum Shentsz Shnum Shstrndx
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261
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262 1 1 2 3 1
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263 0x80499cc 0x34 0x96200 0 0x34
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264 0x20 5 0x28 22 19
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265
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266 * These are the program headers. "Offset" is the file offset to the
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267 * segment. "Vaddr" is the memory load address. "Filesz" is the
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268 * segment size as it appears in the file, and "Memsz" is the size in
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269 * memory. Below, the third segment is the code and the fourth is the
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270 * data: the difference between Filesz and Memsz is .bss
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271
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272 raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
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273
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274 temacs:
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275 ***** PROGRAM EXECUTION HEADER *****
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276 Type Offset Vaddr Paddr
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277 Filesz Memsz Flags Align
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278
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279 6 0x34 0x8048034 0
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280 0xa0 0xa0 5 0
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281
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282 3 0xd4 0 0
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283 0x13 0 4 0
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284
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285 1 0x34 0x8048034 0
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286 0x3f2f9 0x3f2f9 5 0x1000
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287
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288 1 0x3f330 0x8088330 0
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289 0x215c4 0x25a60 7 0x1000
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290
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291 2 0x60874 0x80a9874 0
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292 0x80 0 7 0
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293
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294 raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
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295
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296 xemacs:
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297 ***** PROGRAM EXECUTION HEADER *****
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298 Type Offset Vaddr Paddr
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299 Filesz Memsz Flags Align
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300
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301 6 0x34 0x8048034 0
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302 0xa0 0xa0 5 0
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303
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304 3 0xd4 0 0
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305 0x13 0 4 0
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306
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307 1 0x34 0x8048034 0
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308 0x3f2f9 0x3f2f9 5 0x1000
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309
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310 1 0x3f330 0x8088330 0
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311 0x3e4d0 0x3e4d0 7 0x1000
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312
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313 2 0x60874 0x80a9874 0
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314 0x80 0 7 0
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315
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316
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317 */
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318
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319 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
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320 *
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321 * The above mechanism does not work if the unexeced ELF file is being
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322 * re-layout by other applications (such as `strip'). All the applications
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323 * that re-layout the internal of ELF will layout all sections in ascending
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324 * order of their file offsets. After the re-layout, the data2 section will
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325 * still be the LAST section in the section header vector, but its file offset
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326 * is now being pushed far away down, and causes part of it not to be mapped
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327 * in (ie. not covered by the load segment entry in PHDR vector), therefore
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328 * causes the new binary to fail.
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329 *
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330 * The solution is to modify the unexec algorithm to insert the new data2
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331 * section header right before the new bss section header, so their file
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332 * offsets will be in the ascending order. Since some of the section's (all
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333 * sections AFTER the bss section) indexes are now changed, we also need to
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334 * modify some fields to make them point to the right sections. This is done
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335 * by macro PATCH_INDEX. All the fields that need to be patched are:
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336 *
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337 * 1. ELF header e_shstrndx field.
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338 * 2. section header sh_link and sh_info field.
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339 * 3. symbol table entry st_shndx field.
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340 *
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341 * The above example now should look like:
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342
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343 **** SECTION HEADER TABLE ****
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344 [No] Type Flags Addr Offset Size Name
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345 Link Info Adralgn Entsize
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346
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347 [1] 1 2 0x80480d4 0xd4 0x13 .interp
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348 0 0 0x1 0
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349
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350 [2] 5 2 0x80480e8 0xe8 0x388 .hash
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351 3 0 0x4 0x4
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352
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353 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
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354 4 1 0x4 0x10
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355
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356 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
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357 0 0 0x1 0
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358
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359 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
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360 3 7 0x4 0x8
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361
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362 [6] 1 6 0x8049348 0x1348 0x3 .init
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363 0 0 0x4 0
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364
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365 [7] 1 6 0x804934c 0x134c 0x680 .plt
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366 0 0 0x4 0x4
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367
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368 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
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369 0 0 0x4 0
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370
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371 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
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372 0 0 0x4 0
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373
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374 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
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375 0 0 0x4 0
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376
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377 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
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378 0 0 0x4 0
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379
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380 [12] 1 3 0x8088330 0x3f330 0x20afc .data
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381 0 0 0x4 0
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382
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383 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
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384 0 0 0x4 0
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385
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386 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
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387 0 0 0x4 0x4
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388
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389 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
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390 4 0 0x4 0x8
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391
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392 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
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393 0 0 0x4 0
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394
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395 [17] 8 3 0x80c6800 0x7d800 0 .bss
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396 0 0 0x4 0
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397
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398 [18] 2 0 0 0x7d800 0x9b90 .symtab
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399 19 371 0x4 0x10
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400
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401 [19] 3 0 0 0x87390 0x8526 .strtab
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402 0 0 0x1 0
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403
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404 [20] 3 0 0 0x8f8b6 0x93 .shstrtab
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405 0 0 0x1 0
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406
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407 [21] 1 0 0 0x8f949 0x68b7 .comment
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408 0 0 0x1 0
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409
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410 */
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411
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412 #include <sys/types.h>
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413 #include <stdio.h>
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414 #include <sys/stat.h>
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415 #include <memory.h>
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416 #include <string.h>
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417 #include <errno.h>
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418 #include <unistd.h>
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419 #include <fcntl.h>
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420 #include <elf.h>
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421 #include <sys/mman.h>
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422
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423 #ifndef emacs
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424 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
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425 #else
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426 #include <config.h>
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427 extern void fatal (char *, ...);
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428 #endif
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429
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430 #ifndef ELF_BSS_SECTION_NAME
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431 #define ELF_BSS_SECTION_NAME ".bss"
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432 #endif
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433
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434 /* Get the address of a particular section or program header entry,
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435 * accounting for the size of the entries.
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436 */
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437 /*
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438 On PPC Reference Platform running Solaris 2.5.1
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439 the plt section is also of type NOBI like the bss section.
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440 (not really stored) and therefore sections after the bss
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441 section start at the plt offset. The plt section is always
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442 the one just before the bss section.
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443 Thus, we modify the test from
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444 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
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445 to
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446 if (NEW_SECTION_H (nn).sh_offset >=
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447 OLD_SECTION_H (old_bss_index-1).sh_offset)
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448 This is just a hack. We should put the new data section
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449 before the .plt section.
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450 And we should not have this routine at all but use
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451 the libelf library to read the old file and create the new
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452 file.
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453 The changed code is minimal and depends on prep set in m/prep.h
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454 Erik Deumens
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455 Quantum Theory Project
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456 University of Florida
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457 deumens@qtp.ufl.edu
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458 Apr 23, 1996
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459 */
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460
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461 #define OLD_SECTION_H(n) \
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462 (*(Elf32_Shdr *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
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463 #define NEW_SECTION_H(n) \
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464 (*(Elf32_Shdr *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
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465 #define OLD_PROGRAM_H(n) \
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466 (*(Elf32_Phdr *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
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|
467 #define NEW_PROGRAM_H(n) \
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468 (*(Elf32_Phdr *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
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469
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470 #define PATCH_INDEX(n) \
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471 do { \
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|
472 if ((int) (n) >= old_bss_index) \
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473 (n)++; } while (0)
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474 typedef unsigned char byte;
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|
475
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|
476 /* Round X up to a multiple of Y. */
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477
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|
478 static int
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|
479 round_up (int x, int y)
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|
|
480 {
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|
|
481 int rem = x % y;
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|
|
482 if (rem == 0)
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|
483 return x;
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|
484 return x - rem + y;
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|
|
485 }
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486
|
|
|
487 /* ****************************************************************
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|
488 * unexec
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|
489 *
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490 * driving logic.
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491 *
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492 * In ELF, this works by replacing the old .bss section with a new
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|
493 * .data section, and inserting an empty .bss immediately afterwards.
|
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|
494 *
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|
495 */
|
|
|
496 void unexec (char *new_name, char *old_name, unsigned int data_start,
|
|
|
497 unsigned int bss_start, unsigned int entry_address);
|
|
|
498 void
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|
|
499 unexec (char *new_name, char *old_name, unsigned int data_start,
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|
|
500 unsigned int bss_start, unsigned int entry_address)
|
|
|
501 {
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|
|
502 int new_file, old_file, new_file_size;
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|
|
503
|
|
|
504 /* Pointers to the base of the image of the two files. */
|
|
|
505 caddr_t old_base, new_base;
|
|
|
506
|
|
|
507 /* Pointers to the file, program and section headers for the old and new
|
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|
508 * files.
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|
509 */
|
|
|
510 Elf32_Ehdr *old_file_h, *new_file_h;
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|
|
511 Elf32_Phdr *old_program_h, *new_program_h;
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|
512 Elf32_Shdr *old_section_h, *new_section_h;
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513
|
|
|
514 /* Point to the section name table in the old file */
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|
|
515 char *old_section_names;
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|
|
516
|
|
|
517 Elf32_Addr old_bss_addr, new_bss_addr;
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|
|
518 Elf32_Word old_bss_size, new_data2_size;
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|
|
519 Elf32_Off new_data2_offset;
|
|
|
520 Elf32_Addr new_data2_addr;
|
|
|
521
|
|
|
522 int n, nn, old_bss_index, old_data_index;
|
|
|
523 struct stat stat_buf;
|
|
|
524
|
|
|
525 /* Open the old file & map it into the address space. */
|
|
|
526
|
|
|
527 old_file = open (old_name, O_RDONLY);
|
|
|
528
|
|
|
529 if (old_file < 0)
|
|
|
530 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
|
|
|
531
|
|
|
532 if (fstat (old_file, &stat_buf) == -1)
|
|
|
533 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
|
|
|
534
|
|
|
535 old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
|
|
|
536
|
|
|
537 if (old_base == (caddr_t) -1)
|
|
|
538 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
|
|
|
539
|
|
|
540 #ifdef DEBUG
|
|
|
541 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
|
|
|
542 old_base);
|
|
|
543 #endif
|
|
|
544
|
|
|
545 /* Get pointers to headers & section names */
|
|
|
546
|
|
|
547 old_file_h = (Elf32_Ehdr *) old_base;
|
|
|
548 old_program_h = (Elf32_Phdr *) ((byte *) old_base + old_file_h->e_phoff);
|
|
|
549 old_section_h = (Elf32_Shdr *) ((byte *) old_base + old_file_h->e_shoff);
|
|
|
550 old_section_names = (char *) old_base
|
|
|
551 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
|
|
|
552
|
|
|
553 /* Find the old .bss section. Figure out parameters of the new
|
|
|
554 * data2 and bss sections.
|
|
|
555 */
|
|
|
556
|
|
|
557 for (old_bss_index = 1; old_bss_index < (int) old_file_h->e_shnum;
|
|
|
558 old_bss_index++)
|
|
|
559 {
|
|
|
560 #ifdef DEBUG
|
|
|
561 fprintf (stderr, "Looking for .bss - found %s\n",
|
|
|
562 old_section_names + OLD_SECTION_H (old_bss_index).sh_name);
|
|
|
563 #endif
|
|
|
564 if (!strcmp (old_section_names + OLD_SECTION_H (old_bss_index).sh_name,
|
|
|
565 ELF_BSS_SECTION_NAME))
|
|
|
566 break;
|
|
|
567 }
|
|
|
568 if (old_bss_index == old_file_h->e_shnum)
|
|
|
569 fatal ("Can't find .bss in %s.\n", old_name, 0);
|
|
|
570
|
|
|
571 old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
|
|
|
572 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
|
|
|
573 #if defined(emacs) || !defined(DEBUG)
|
|
|
574 new_bss_addr = (Elf32_Addr) sbrk (0);
|
|
|
575 #else
|
|
|
576 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
|
|
|
577 #endif
|
|
|
578 new_data2_addr = old_bss_addr;
|
|
|
579 new_data2_size = new_bss_addr - old_bss_addr;
|
|
|
580 new_data2_offset = OLD_SECTION_H (old_bss_index).sh_offset;
|
|
|
581
|
|
|
582 #ifdef DEBUG
|
|
|
583 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
|
|
|
584 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
|
|
|
585 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
|
|
|
586 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
|
|
|
587 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
|
|
|
588 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
|
|
|
589 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
|
|
|
590 #endif
|
|
|
591
|
|
|
592 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
|
|
|
593 fatal (".bss shrank when undumping???\n", 0, 0);
|
|
|
594
|
|
|
595 /* Set the output file to the right size and mmap it. Set
|
|
|
596 * pointers to various interesting objects. stat_buf still has
|
|
|
597 * old_file data.
|
|
|
598 */
|
|
|
599
|
|
|
600 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
|
|
|
601 if (new_file < 0)
|
|
|
602 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
|
|
|
603
|
|
|
604 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
|
|
|
605
|
|
|
606 if (ftruncate (new_file, new_file_size))
|
|
|
607 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
|
|
|
608
|
|
|
609 #ifdef UNEXEC_USE_MAP_PRIVATE
|
|
|
610 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_PRIVATE,
|
|
|
611 new_file, 0);
|
|
|
612 #else
|
|
|
613 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED,
|
|
|
614 new_file, 0);
|
|
|
615 #endif
|
|
|
616
|
|
|
617 if (new_base == (caddr_t) -1)
|
|
|
618 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
|
|
|
619
|
|
|
620 new_file_h = (Elf32_Ehdr *) new_base;
|
|
|
621 new_program_h = (Elf32_Phdr *) ((byte *) new_base + old_file_h->e_phoff);
|
|
|
622 new_section_h = (Elf32_Shdr *)
|
|
|
623 ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
|
|
|
624
|
|
|
625 /* Make our new file, program and section headers as copies of the
|
|
|
626 * originals.
|
|
|
627 */
|
|
|
628
|
|
|
629 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
|
|
|
630 memcpy (new_program_h, old_program_h,
|
|
|
631 old_file_h->e_phnum * old_file_h->e_phentsize);
|
|
|
632
|
|
|
633 /* Modify the e_shstrndx if necessary. */
|
|
|
634 PATCH_INDEX (new_file_h->e_shstrndx);
|
|
|
635
|
|
|
636 /* Fix up file header. We'll add one section. Section header is
|
|
|
637 * further away now.
|
|
|
638 */
|
|
|
639
|
|
|
640 new_file_h->e_shoff += new_data2_size;
|
|
|
641 new_file_h->e_shnum += 1;
|
|
|
642
|
|
|
643 #ifdef DEBUG
|
|
|
644 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
|
|
|
645 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
|
|
|
646 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
|
|
|
647 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
|
|
|
648 #endif
|
|
|
649
|
|
|
650 /* Fix up a new program header. Extend the writable data segment so
|
|
|
651 * that the bss area is covered too. Find that segment by looking
|
|
|
652 * for a segment that ends just before the .bss area. Make sure
|
|
|
653 * that no segments are above the new .data2. Put a loop at the end
|
|
|
654 * to adjust the offset and address of any segment that is above
|
|
|
655 * data2, just in case we decide to allow this later.
|
|
|
656 */
|
|
|
657
|
|
|
658 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
659 {
|
|
|
660 /* Compute maximum of all requirements for alignment of section. */
|
|
|
661 int alignment = (NEW_PROGRAM_H (n)).p_align;
|
|
|
662 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
|
|
|
663 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
|
|
|
664
|
|
|
665 #ifndef __mips /* ifndef added by jwz at suggestion of
|
|
|
666 r02kar@x4u2.desy.de (Karsten Kuenne) to avoid
|
|
|
667 "Program segment above .bss" when dumping.
|
|
|
668 */
|
|
|
669 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz > old_bss_addr)
|
|
|
670 fatal ("Program segment above .bss in %s\n", old_name, 0);
|
|
|
671 #endif /* __mips */
|
|
|
672
|
|
|
673 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
|
|
|
674 && (round_up ((int) ((NEW_PROGRAM_H (n)).p_vaddr
|
|
|
675 + (NEW_PROGRAM_H (n)).p_filesz),
|
|
|
676 alignment)
|
|
|
677 == round_up ((int) old_bss_addr, alignment)))
|
|
|
678 break;
|
|
|
679 }
|
|
|
680 if (n < 0)
|
|
|
681 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
|
|
|
682
|
|
|
683 NEW_PROGRAM_H (n).p_filesz += new_data2_size;
|
|
|
684 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
|
|
|
685
|
|
|
686 #if 0 /* Maybe allow section after data2 - does this ever happen? */
|
|
|
687 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
688 {
|
|
|
689 if (NEW_PROGRAM_H (n).p_vaddr
|
|
|
690 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
|
|
|
691 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
|
|
|
692
|
|
|
693 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
|
|
|
694 NEW_PROGRAM_H (n).p_offset += new_data2_size;
|
|
|
695 }
|
|
|
696 #endif
|
|
|
697
|
|
|
698 /* Fix up section headers based on new .data2 section. Any section
|
|
|
699 * whose offset or virtual address is after the new .data2 section
|
|
|
700 * gets its value adjusted. .bss size becomes zero and new address
|
|
|
701 * is set. data2 section header gets added by copying the existing
|
|
|
702 * .data header and modifying the offset, address and size.
|
|
|
703 */
|
|
|
704 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
|
|
|
705 old_data_index++)
|
|
|
706 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
|
|
|
707 ".data"))
|
|
|
708 break;
|
|
|
709 if (old_data_index == old_file_h->e_shnum)
|
|
|
710 fatal ("Can't find .data in %s.\n", old_name, 0);
|
|
|
711
|
|
|
712 /* Walk through all section headers, insert the new data2 section right
|
|
|
713 before the new bss section. */
|
|
|
714 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
|
|
|
715 {
|
|
|
716 caddr_t src;
|
|
|
717 /* If it is bss section, insert the new data2 section before it. */
|
|
|
718 if (n == old_bss_index)
|
|
|
719 {
|
|
|
720 /* Steal the data section header for this data2 section. */
|
|
|
721 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
|
|
|
722 new_file_h->e_shentsize);
|
|
|
723
|
|
|
724 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
|
|
|
725 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
|
|
|
726 NEW_SECTION_H (nn).sh_size = new_data2_size;
|
|
|
727 /* Use the bss section's alignment. This will assure that the
|
|
|
728 new data2 section always be placed in the same spot as the old
|
|
|
729 bss section by any other application. */
|
|
|
730 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
|
|
|
731
|
|
|
732 /* Now copy over what we have in the memory now. */
|
|
|
733 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
|
|
|
734 (caddr_t) OLD_SECTION_H (n).sh_addr,
|
|
|
735 new_data2_size);
|
|
|
736 nn++;
|
|
|
737 }
|
|
|
738
|
|
|
739 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
|
|
|
740 old_file_h->e_shentsize);
|
|
|
741
|
|
|
742 /* The new bss section's size is zero, and its file offset and virtual
|
|
|
743 address should be off by NEW_DATA2_SIZE. */
|
|
|
744 if (n == old_bss_index)
|
|
|
745 {
|
|
|
746 /* NN should be `old_bss_index + 1' at this point. */
|
|
|
747 NEW_SECTION_H (nn).sh_offset += new_data2_size;
|
|
|
748 NEW_SECTION_H (nn).sh_addr += new_data2_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 = OLD_SECTION_H (nn).sh_addralign;
|
|
|
753 NEW_SECTION_H (nn).sh_size = 0;
|
|
|
754 }
|
|
|
755 else
|
|
|
756 {
|
|
|
757 /* Any section that was original placed AFTER the bss
|
|
|
758 section should now be off by NEW_DATA2_SIZE. */
|
|
|
759 #ifdef SOLARIS_POWERPC
|
|
|
760 /* On PPC Reference Platform running Solaris 2.5.1
|
|
|
761 the plt section is also of type NOBI like the bss section.
|
|
|
762 (not really stored) and therefore sections after the bss
|
|
|
763 section start at the plt offset. The plt section is always
|
|
|
764 the one just before the bss section.
|
|
|
765 It would be better to put the new data section before
|
|
|
766 the .plt section, or use libelf instead.
|
|
|
767 Erik Deumens, deumens@qtp.ufl.edu. */
|
|
|
768 if (NEW_SECTION_H (nn).sh_offset
|
|
|
769 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
|
|
|
770 NEW_SECTION_H (nn).sh_offset += new_data2_size;
|
|
|
771 #else
|
|
|
772 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
|
|
|
773 NEW_SECTION_H (nn).sh_offset += new_data2_size;
|
|
|
774 #endif
|
|
|
775 /* Any section that was originally placed after the section
|
|
|
776 header table should now be off by the size of one section
|
|
|
777 header table entry. */
|
|
|
778 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
|
|
|
779 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
|
|
|
780 }
|
|
|
781
|
|
|
782 /* If any section hdr refers to the section after the new .data
|
|
|
783 section, make it refer to next one because we have inserted
|
|
|
784 a new section in between. */
|
|
|
785
|
|
|
786 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
|
|
|
787 /* For symbol tables, info is a symbol table index,
|
|
|
788 so don't change it. */
|
|
|
789 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
|
|
|
790 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
|
|
|
791 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
|
|
|
792
|
|
|
793 /* Now, start to copy the content of sections. */
|
|
|
794 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
|
|
|
795 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
|
|
|
796 continue;
|
|
|
797
|
|
|
798 /* Write out the sections. .data and .data1 (and data2, called
|
|
|
799 ".data" in the strings table) get copied from the current process
|
|
|
800 instead of the old file. */
|
|
|
801 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
|
|
|
802 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
|
803 ".data1"))
|
|
|
804 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
|
|
|
805 else
|
|
|
806 src = old_base + OLD_SECTION_H (n).sh_offset;
|
|
|
807
|
|
|
808 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
|
|
|
809 NEW_SECTION_H (nn).sh_size);
|
|
|
810
|
|
|
811 /* If it is the symbol table, its st_shndx field needs to be patched. */
|
|
|
812 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
|
|
|
813 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
|
|
|
814 {
|
|
|
815 Elf32_Shdr *spt = &NEW_SECTION_H (nn);
|
|
|
816 unsigned int num = spt->sh_size / spt->sh_entsize;
|
|
|
817 Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H (nn).sh_offset +
|
|
|
818 new_base);
|
|
|
819 for (; num--; sym++)
|
|
|
820 {
|
|
|
821 if ((sym->st_shndx == SHN_UNDEF)
|
|
|
822 || (sym->st_shndx == SHN_ABS)
|
|
|
823 || (sym->st_shndx == SHN_COMMON))
|
|
|
824 continue;
|
|
|
825
|
|
|
826 PATCH_INDEX (sym->st_shndx);
|
|
|
827 }
|
|
|
828 }
|
|
|
829 }
|
|
|
830
|
|
|
831 /* Update the symbol values of _edata and _end. */
|
|
|
832 for (n = new_file_h->e_shnum - 1; n; n--)
|
|
|
833 {
|
|
|
834 byte *symnames;
|
|
|
835 Elf32_Sym *symp, *symendp;
|
|
|
836
|
|
|
837 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
|
|
|
838 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
|
|
|
839 continue;
|
|
|
840
|
|
|
841 symnames = ((byte *) new_base
|
|
|
842 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
|
|
|
843 symp = (Elf32_Sym *) (NEW_SECTION_H (n).sh_offset + new_base);
|
|
|
844 symendp = (Elf32_Sym *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
|
|
|
845
|
|
|
846 for (; symp < symendp; symp ++)
|
|
|
847 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
|
|
|
848 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0)
|
|
|
849 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
|
|
|
850 }
|
|
|
851
|
|
|
852 /* This loop seeks out relocation sections for the data section, so
|
|
|
853 that it can undo relocations performed by the runtime linker. */
|
|
|
854 for (n = new_file_h->e_shnum - 1; n; n--)
|
|
|
855 {
|
|
|
856 Elf32_Shdr section = NEW_SECTION_H (n);
|
|
|
857 switch (section.sh_type) {
|
|
|
858 default:
|
|
|
859 break;
|
|
|
860 case SHT_REL:
|
|
|
861 case SHT_RELA:
|
|
|
862 /* This code handles two different size structs, but there should
|
|
|
863 be no harm in that provided that r_offset is always the first
|
|
|
864 member. */
|
|
|
865 nn = section.sh_info;
|
|
|
866 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
|
|
|
867 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
868 ".data1"))
|
|
|
869 {
|
|
|
870 Elf32_Addr offset = NEW_SECTION_H (nn).sh_addr -
|
|
|
871 NEW_SECTION_H (nn).sh_offset;
|
|
|
872 caddr_t reloc = old_base + section.sh_offset, end;
|
|
|
873 for (end = reloc + section.sh_size; reloc < end;
|
|
|
874 reloc += section.sh_entsize)
|
|
|
875 {
|
|
|
876 Elf32_Addr addr = ((Elf32_Rel *) reloc)->r_offset - offset;
|
|
|
877 memcpy (new_base + addr, old_base + addr, 4);
|
|
|
878 }
|
|
|
879 }
|
|
|
880 break;
|
|
|
881 }
|
|
|
882 }
|
|
|
883
|
|
|
884 #ifdef UNEXEC_USE_MAP_PRIVATE
|
|
|
885 if (lseek (new_file, 0, SEEK_SET) == -1)
|
|
|
886 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
|
|
|
887
|
|
|
888 if (write (new_file, new_base, new_file_size) != new_file_size)
|
|
|
889 fatal ("Can't write (%s): errno %d\n", new_name, errno);
|
|
|
890 #endif
|
|
|
891
|
|
|
892 /* Close the files and make the new file executable. */
|
|
|
893
|
|
|
894 if (close (old_file))
|
|
|
895 fatal ("Can't close (%s): errno %d\n", old_name, errno);
|
|
|
896
|
|
|
897 if (close (new_file))
|
|
|
898 fatal ("Can't close (%s): errno %d\n", new_name, errno);
|
|
|
899
|
|
|
900 if (stat (new_name, &stat_buf) == -1)
|
|
|
901 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
|
|
|
902
|
|
|
903 n = umask (777);
|
|
|
904 umask (n);
|
|
|
905 stat_buf.st_mode |= 0111 & ~n;
|
|
|
906 if (chmod (new_name, stat_buf.st_mode) == -1)
|
|
|
907 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
|
|
|
908 }
|
