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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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353
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21 /* Synched up with: FSF 20.4. */
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0
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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
|
|
|
387 0 0 0x4 0x4
|
|
|
388
|
|
|
389 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
|
|
|
390 4 0 0x4 0x8
|
|
|
391
|
|
|
392 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
|
|
|
393 0 0 0x4 0
|
|
|
394
|
|
|
395 [17] 8 3 0x80c6800 0x7d800 0 .bss
|
|
|
396 0 0 0x4 0
|
|
|
397
|
|
|
398 [18] 2 0 0 0x7d800 0x9b90 .symtab
|
|
|
399 19 371 0x4 0x10
|
|
|
400
|
|
|
401 [19] 3 0 0 0x87390 0x8526 .strtab
|
|
|
402 0 0 0x1 0
|
|
|
403
|
|
|
404 [20] 3 0 0 0x8f8b6 0x93 .shstrtab
|
|
|
405 0 0 0x1 0
|
|
|
406
|
|
|
407 [21] 1 0 0 0x8f949 0x68b7 .comment
|
|
|
408 0 0 0x1 0
|
|
|
409
|
|
|
410 */
|
|
|
411
|
|
274
|
412 #ifndef emacs
|
|
|
413 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
|
|
|
414 #else
|
|
|
415 #include <config.h>
|
|
|
416 extern void fatal (CONST char *, ...);
|
|
|
417 #endif
|
|
|
418
|
|
0
|
419 #include <sys/types.h>
|
|
|
420 #include <stdio.h>
|
|
|
421 #include <sys/stat.h>
|
|
|
422 #include <memory.h>
|
|
|
423 #include <string.h>
|
|
|
424 #include <errno.h>
|
|
|
425 #include <unistd.h>
|
|
|
426 #include <fcntl.h>
|
|
353
|
427 #if !defined (__NetBSD__) && !defined (__OpenBSD__)
|
|
0
|
428 #include <elf.h>
|
|
353
|
429 #endif
|
|
0
|
430 #include <sys/mman.h>
|
|
353
|
431 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
|
|
|
432 #include <sys/elf_mips.h>
|
|
|
433 #include <sym.h>
|
|
|
434 #endif /* __sony_news && _SYSTYPE_SYSV */
|
|
357
|
435 #ifdef __sgi
|
|
359
|
436 #include <syms.h> /* for HDRR declaration */
|
|
353
|
437 #endif /* __sgi */
|
|
0
|
438
|
|
353
|
439 #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__)
|
|
|
440 /* Declare COFF debugging symbol table. This used to be in
|
|
|
441 /usr/include/sym.h, but this file is no longer included in Red Hat
|
|
|
442 5.0 and presumably in any other glibc 2.x based distribution. */
|
|
|
443 typedef struct {
|
|
|
444 short magic;
|
|
|
445 short vstamp;
|
|
|
446 int ilineMax;
|
|
|
447 int idnMax;
|
|
|
448 int ipdMax;
|
|
|
449 int isymMax;
|
|
|
450 int ioptMax;
|
|
|
451 int iauxMax;
|
|
|
452 int issMax;
|
|
|
453 int issExtMax;
|
|
|
454 int ifdMax;
|
|
|
455 int crfd;
|
|
|
456 int iextMax;
|
|
|
457 long cbLine;
|
|
|
458 long cbLineOffset;
|
|
|
459 long cbDnOffset;
|
|
|
460 long cbPdOffset;
|
|
|
461 long cbSymOffset;
|
|
|
462 long cbOptOffset;
|
|
|
463 long cbAuxOffset;
|
|
|
464 long cbSsOffset;
|
|
|
465 long cbSsExtOffset;
|
|
|
466 long cbFdOffset;
|
|
|
467 long cbRfdOffset;
|
|
|
468 long cbExtOffset;
|
|
|
469 } HDRR, *pHDRR;
|
|
|
470 #define cbHDRR sizeof(HDRR)
|
|
|
471 #define hdrNil ((pHDRR)0)
|
|
|
472 #endif
|
|
|
473
|
|
|
474 #ifdef __NetBSD__
|
|
|
475 /*
|
|
|
476 * NetBSD does not have normal-looking user-land ELF support.
|
|
|
477 */
|
|
|
478 # ifdef __alpha__
|
|
|
479 # define ELFSIZE 64
|
|
|
480 # else
|
|
|
481 # define ELFSIZE 32
|
|
|
482 # endif
|
|
|
483 # include <sys/exec_elf.h>
|
|
|
484
|
|
|
485 # define PT_LOAD Elf_pt_load
|
|
|
486 # define SHT_SYMTAB Elf_sht_symtab
|
|
|
487 # define SHT_DYNSYM Elf_sht_dynsym
|
|
|
488 # define SHT_NULL Elf_sht_null
|
|
|
489 # define SHT_NOBITS Elf_sht_nobits
|
|
|
490 # define SHT_REL Elf_sht_rel
|
|
|
491 # define SHT_RELA Elf_sht_rela
|
|
|
492
|
|
|
493 # define SHN_UNDEF Elf_eshn_undefined
|
|
|
494 # define SHN_ABS Elf_eshn_absolute
|
|
|
495 # define SHN_COMMON Elf_eshn_common
|
|
|
496
|
|
|
497 # ifdef __alpha__
|
|
|
498 # include <sys/exec_ecoff.h>
|
|
|
499 # define HDRR struct ecoff_symhdr
|
|
|
500 # define pHDRR HDRR *
|
|
|
501 # endif
|
|
|
502 #endif /* __NetBSD__ */
|
|
|
503
|
|
|
504 #ifdef __OpenBSD__
|
|
|
505 # include <sys/exec_elf.h>
|
|
|
506 #endif
|
|
|
507
|
|
|
508 #if __GNU_LIBRARY__ - 0 >= 6
|
|
255
|
509 # include <link.h> /* get ElfW etc */
|
|
|
510 #endif
|
|
|
511
|
|
|
512 #ifndef ElfW
|
|
|
513 # ifdef __STDC__
|
|
|
514 # define ElfW(type) Elf32_##type
|
|
|
515 # else
|
|
|
516 # define ElfW(type) Elf32_/**/type
|
|
|
517 # endif
|
|
|
518 #endif
|
|
|
519
|
|
0
|
520 #ifndef ELF_BSS_SECTION_NAME
|
|
|
521 #define ELF_BSS_SECTION_NAME ".bss"
|
|
|
522 #endif
|
|
|
523
|
|
|
524 /* Get the address of a particular section or program header entry,
|
|
|
525 * accounting for the size of the entries.
|
|
|
526 */
|
|
272
|
527 /*
|
|
0
|
528 On PPC Reference Platform running Solaris 2.5.1
|
|
|
529 the plt section is also of type NOBI like the bss section.
|
|
|
530 (not really stored) and therefore sections after the bss
|
|
|
531 section start at the plt offset. The plt section is always
|
|
|
532 the one just before the bss section.
|
|
|
533 Thus, we modify the test from
|
|
|
534 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
|
|
|
535 to
|
|
272
|
536 if (NEW_SECTION_H (nn).sh_offset >=
|
|
0
|
537 OLD_SECTION_H (old_bss_index-1).sh_offset)
|
|
|
538 This is just a hack. We should put the new data section
|
|
|
539 before the .plt section.
|
|
|
540 And we should not have this routine at all but use
|
|
|
541 the libelf library to read the old file and create the new
|
|
|
542 file.
|
|
|
543 The changed code is minimal and depends on prep set in m/prep.h
|
|
|
544 Erik Deumens
|
|
|
545 Quantum Theory Project
|
|
|
546 University of Florida
|
|
|
547 deumens@qtp.ufl.edu
|
|
|
548 Apr 23, 1996
|
|
|
549 */
|
|
|
550
|
|
|
551 #define OLD_SECTION_H(n) \
|
|
255
|
552 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
|
|
0
|
553 #define NEW_SECTION_H(n) \
|
|
255
|
554 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
|
|
0
|
555 #define OLD_PROGRAM_H(n) \
|
|
255
|
556 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
|
|
0
|
557 #define NEW_PROGRAM_H(n) \
|
|
255
|
558 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
|
|
0
|
559
|
|
|
560 #define PATCH_INDEX(n) \
|
|
|
561 do { \
|
|
|
562 if ((int) (n) >= old_bss_index) \
|
|
|
563 (n)++; } while (0)
|
|
|
564 typedef unsigned char byte;
|
|
|
565
|
|
|
566 /* Round X up to a multiple of Y. */
|
|
|
567
|
|
353
|
568 static ElfW(Addr)
|
|
|
569 round_up (ElfW(Addr) x, ElfW(Addr) y)
|
|
0
|
570 {
|
|
|
571 int rem = x % y;
|
|
|
572 if (rem == 0)
|
|
|
573 return x;
|
|
|
574 return x - rem + y;
|
|
|
575 }
|
|
|
576
|
|
359
|
577 /* Return the index of the section named NAME.
|
|
|
578 SECTION_NAMES, FILE_NAME and FILE_H give information
|
|
|
579 about the file we are looking in.
|
|
|
580
|
|
|
581 If we don't find the section NAME, that is a fatal error
|
|
|
582 if NOERROR is 0; we return -1 if NOERROR is nonzero. */
|
|
|
583
|
|
|
584 static int
|
|
|
585 find_section (name, section_names, file_name, old_file_h, old_section_h, noerror)
|
|
|
586 char *name;
|
|
|
587 char *section_names;
|
|
|
588 char *file_name;
|
|
|
589 ElfW(Ehdr) *old_file_h;
|
|
|
590 ElfW(Shdr) *old_section_h;
|
|
|
591 int noerror;
|
|
|
592 {
|
|
|
593 int idx;
|
|
|
594
|
|
|
595 for (idx = 1; idx < old_file_h->e_shnum; idx++)
|
|
|
596 {
|
|
|
597 #ifdef DEBUG
|
|
|
598 fprintf (stderr, "Looking for %s - found %s\n", name,
|
|
|
599 section_names + OLD_SECTION_H (idx).sh_name);
|
|
|
600 #endif
|
|
|
601 if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
|
|
|
602 name))
|
|
|
603 break;
|
|
|
604 }
|
|
|
605 if (idx == old_file_h->e_shnum)
|
|
|
606 {
|
|
|
607 if (noerror)
|
|
|
608 return -1;
|
|
|
609 else
|
|
|
610 fatal ("Can't find %s in %s.\n", name, file_name, 0);
|
|
|
611 }
|
|
|
612
|
|
|
613 return idx;
|
|
|
614 }
|
|
|
615
|
|
0
|
616 /* ****************************************************************
|
|
|
617 * unexec
|
|
|
618 *
|
|
|
619 * driving logic.
|
|
|
620 *
|
|
|
621 * In ELF, this works by replacing the old .bss section with a new
|
|
|
622 * .data section, and inserting an empty .bss immediately afterwards.
|
|
|
623 *
|
|
|
624 */
|
|
|
625 void unexec (char *new_name, char *old_name, unsigned int data_start,
|
|
|
626 unsigned int bss_start, unsigned int entry_address);
|
|
|
627 void
|
|
|
628 unexec (char *new_name, char *old_name, unsigned int data_start,
|
|
|
629 unsigned int bss_start, unsigned int entry_address)
|
|
|
630 {
|
|
|
631 int new_file, old_file, new_file_size;
|
|
|
632
|
|
|
633 /* Pointers to the base of the image of the two files. */
|
|
|
634 caddr_t old_base, new_base;
|
|
|
635
|
|
|
636 /* Pointers to the file, program and section headers for the old and new
|
|
|
637 * files.
|
|
|
638 */
|
|
255
|
639 ElfW(Ehdr) *old_file_h, *new_file_h;
|
|
|
640 ElfW(Phdr) *old_program_h, *new_program_h;
|
|
|
641 ElfW(Shdr) *old_section_h, *new_section_h;
|
|
0
|
642
|
|
|
643 /* Point to the section name table in the old file */
|
|
|
644 char *old_section_names;
|
|
|
645
|
|
255
|
646 ElfW(Addr) old_bss_addr, new_bss_addr;
|
|
|
647 ElfW(Word) old_bss_size, new_data2_size;
|
|
|
648 ElfW(Off) new_data2_offset;
|
|
|
649 ElfW(Addr) new_data2_addr;
|
|
0
|
650
|
|
359
|
651 int n, nn;
|
|
|
652 int old_bss_index, old_sbss_index;
|
|
|
653 int old_data_index, new_data2_index;
|
|
|
654 int old_mdebug_index;
|
|
0
|
655 struct stat stat_buf;
|
|
|
656
|
|
|
657 /* Open the old file & map it into the address space. */
|
|
|
658
|
|
|
659 old_file = open (old_name, O_RDONLY);
|
|
|
660
|
|
|
661 if (old_file < 0)
|
|
|
662 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
|
|
|
663
|
|
|
664 if (fstat (old_file, &stat_buf) == -1)
|
|
|
665 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
|
|
|
666
|
|
|
667 old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
|
|
|
668
|
|
|
669 if (old_base == (caddr_t) -1)
|
|
|
670 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
|
|
|
671
|
|
|
672 #ifdef DEBUG
|
|
|
673 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
|
|
|
674 old_base);
|
|
|
675 #endif
|
|
|
676
|
|
|
677 /* Get pointers to headers & section names */
|
|
|
678
|
|
255
|
679 old_file_h = (ElfW(Ehdr) *) old_base;
|
|
|
680 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
|
|
|
681 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
|
|
0
|
682 old_section_names = (char *) old_base
|
|
|
683 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
|
|
|
684
|
|
359
|
685 /* Find the mdebug section, if any. */
|
|
|
686
|
|
|
687 old_mdebug_index = find_section (".mdebug", old_section_names,
|
|
|
688 old_name, old_file_h, old_section_h, 1);
|
|
|
689
|
|
0
|
690 /* Find the old .bss section. Figure out parameters of the new
|
|
|
691 * data2 and bss sections.
|
|
|
692 */
|
|
|
693
|
|
359
|
694 old_bss_index = find_section (".bss", old_section_names,
|
|
|
695 old_name, old_file_h, old_section_h, 0);
|
|
0
|
696
|
|
359
|
697 old_sbss_index = find_section (".sbss", old_section_names,
|
|
|
698 old_name, old_file_h, old_section_h, 1);
|
|
|
699
|
|
|
700 if (old_sbss_index == -1)
|
|
353
|
701 {
|
|
359
|
702 old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
|
|
|
703 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
|
|
353
|
704 new_data2_index = old_bss_index;
|
|
|
705 }
|
|
|
706 else
|
|
|
707 {
|
|
359
|
708 old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr;
|
|
|
709 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size
|
|
|
710 + OLD_SECTION_H (old_sbss_index).sh_size;
|
|
353
|
711 new_data2_index = old_sbss_index;
|
|
|
712 }
|
|
|
713
|
|
359
|
714 /* Find the old .data section. Figure out parameters of
|
|
|
715 the new data2 and bss sections. */
|
|
|
716
|
|
|
717 old_data_index = find_section (".data", old_section_names,
|
|
|
718 old_name, old_file_h, old_section_h, 0);
|
|
353
|
719
|
|
255
|
720 #if defined (emacs) || !defined (DEBUG)
|
|
|
721 new_bss_addr = (ElfW(Addr)) sbrk (0);
|
|
0
|
722 #else
|
|
|
723 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
|
|
|
724 #endif
|
|
|
725 new_data2_addr = old_bss_addr;
|
|
|
726 new_data2_size = new_bss_addr - old_bss_addr;
|
|
359
|
727 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
|
|
|
728 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
|
|
0
|
729
|
|
|
730 #ifdef DEBUG
|
|
|
731 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
|
|
|
732 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
|
|
|
733 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
|
|
|
734 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
|
|
|
735 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
|
|
|
736 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
|
|
|
737 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
|
|
|
738 #endif
|
|
|
739
|
|
|
740 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
|
|
|
741 fatal (".bss shrank when undumping???\n", 0, 0);
|
|
|
742
|
|
|
743 /* Set the output file to the right size and mmap it. Set
|
|
|
744 * pointers to various interesting objects. stat_buf still has
|
|
|
745 * old_file data.
|
|
|
746 */
|
|
|
747
|
|
|
748 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
|
|
|
749 if (new_file < 0)
|
|
|
750 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
|
|
|
751
|
|
|
752 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
|
|
|
753
|
|
|
754 if (ftruncate (new_file, new_file_size))
|
|
|
755 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
|
|
|
756
|
|
|
757 #ifdef UNEXEC_USE_MAP_PRIVATE
|
|
|
758 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_PRIVATE,
|
|
|
759 new_file, 0);
|
|
|
760 #else
|
|
|
761 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED,
|
|
|
762 new_file, 0);
|
|
|
763 #endif
|
|
|
764
|
|
|
765 if (new_base == (caddr_t) -1)
|
|
|
766 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
|
|
|
767
|
|
255
|
768 new_file_h = (ElfW(Ehdr) *) new_base;
|
|
|
769 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
|
|
|
770 new_section_h = (ElfW(Shdr) *)
|
|
0
|
771 ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
|
|
|
772
|
|
|
773 /* Make our new file, program and section headers as copies of the
|
|
|
774 * originals.
|
|
|
775 */
|
|
|
776
|
|
|
777 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
|
|
|
778 memcpy (new_program_h, old_program_h,
|
|
|
779 old_file_h->e_phnum * old_file_h->e_phentsize);
|
|
|
780
|
|
|
781 /* Modify the e_shstrndx if necessary. */
|
|
|
782 PATCH_INDEX (new_file_h->e_shstrndx);
|
|
|
783
|
|
|
784 /* Fix up file header. We'll add one section. Section header is
|
|
|
785 * further away now.
|
|
|
786 */
|
|
|
787
|
|
|
788 new_file_h->e_shoff += new_data2_size;
|
|
|
789 new_file_h->e_shnum += 1;
|
|
|
790
|
|
|
791 #ifdef DEBUG
|
|
|
792 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
|
|
|
793 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
|
|
|
794 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
|
|
|
795 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
|
|
|
796 #endif
|
|
|
797
|
|
|
798 /* Fix up a new program header. Extend the writable data segment so
|
|
|
799 * that the bss area is covered too. Find that segment by looking
|
|
|
800 * for a segment that ends just before the .bss area. Make sure
|
|
|
801 * that no segments are above the new .data2. Put a loop at the end
|
|
|
802 * to adjust the offset and address of any segment that is above
|
|
|
803 * data2, just in case we decide to allow this later.
|
|
|
804 */
|
|
|
805
|
|
|
806 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
807 {
|
|
|
808 /* Compute maximum of all requirements for alignment of section. */
|
|
272
|
809 ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align;
|
|
0
|
810 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
|
|
|
811 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
|
|
|
812
|
|
359
|
813 #ifdef __sgi
|
|
353
|
814 /* According to r02kar@x4u2.desy.de (Karsten Kuenne)
|
|
|
815 and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we
|
|
|
816 always get "Program segment above .bss" when dumping
|
|
|
817 when the executable doesn't have an sbss section. */
|
|
|
818 if (old_sbss_index != -1)
|
|
359
|
819 #endif /* __sgi */
|
|
353
|
820 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
|
|
|
821 > (old_sbss_index == -1
|
|
|
822 ? old_bss_addr
|
|
|
823 : round_up (old_bss_addr, alignment)))
|
|
|
824 fatal ("Program segment above .bss in %s\n", old_name, 0);
|
|
0
|
825
|
|
|
826 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
|
|
353
|
827 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
|
|
|
828 + (NEW_PROGRAM_H (n)).p_filesz,
|
|
0
|
829 alignment)
|
|
353
|
830 == round_up (old_bss_addr, alignment)))
|
|
0
|
831 break;
|
|
|
832 }
|
|
|
833 if (n < 0)
|
|
|
834 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
|
|
|
835
|
|
353
|
836 /* Make sure that the size includes any padding before the old .bss
|
|
|
837 section. */
|
|
251
|
838 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
|
|
0
|
839 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
|
|
|
840
|
|
|
841 #if 0 /* Maybe allow section after data2 - does this ever happen? */
|
|
|
842 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
843 {
|
|
|
844 if (NEW_PROGRAM_H (n).p_vaddr
|
|
|
845 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
|
|
|
846 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
|
|
|
847
|
|
|
848 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
|
|
|
849 NEW_PROGRAM_H (n).p_offset += new_data2_size;
|
|
|
850 }
|
|
|
851 #endif
|
|
|
852
|
|
|
853 /* Fix up section headers based on new .data2 section. Any section
|
|
|
854 * whose offset or virtual address is after the new .data2 section
|
|
|
855 * gets its value adjusted. .bss size becomes zero and new address
|
|
|
856 * is set. data2 section header gets added by copying the existing
|
|
|
857 * .data header and modifying the offset, address and size.
|
|
|
858 */
|
|
|
859 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
|
|
|
860 old_data_index++)
|
|
|
861 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
|
|
|
862 ".data"))
|
|
|
863 break;
|
|
|
864 if (old_data_index == old_file_h->e_shnum)
|
|
|
865 fatal ("Can't find .data in %s.\n", old_name, 0);
|
|
|
866
|
|
|
867 /* Walk through all section headers, insert the new data2 section right
|
|
|
868 before the new bss section. */
|
|
|
869 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
|
|
|
870 {
|
|
|
871 caddr_t src;
|
|
353
|
872 /* If it is (s)bss section, insert the new data2 section before it. */
|
|
|
873 /* new_data2_index is the index of either old_sbss or old_bss, that was
|
|
|
874 chosen as a section for new_data2. */
|
|
|
875 if (n == new_data2_index)
|
|
0
|
876 {
|
|
|
877 /* Steal the data section header for this data2 section. */
|
|
|
878 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
|
|
|
879 new_file_h->e_shentsize);
|
|
|
880
|
|
|
881 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
|
|
|
882 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
|
|
|
883 NEW_SECTION_H (nn).sh_size = new_data2_size;
|
|
|
884 /* Use the bss section's alignment. This will assure that the
|
|
|
885 new data2 section always be placed in the same spot as the old
|
|
|
886 bss section by any other application. */
|
|
|
887 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
|
|
|
888
|
|
|
889 /* Now copy over what we have in the memory now. */
|
|
|
890 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
|
|
|
891 (caddr_t) OLD_SECTION_H (n).sh_addr,
|
|
|
892 new_data2_size);
|
|
|
893 nn++;
|
|
|
894 }
|
|
|
895
|
|
|
896 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
|
|
|
897 old_file_h->e_shentsize);
|
|
353
|
898
|
|
|
899 if (n == old_bss_index
|
|
|
900 /* The new bss and sbss section's size is zero, and its file offset
|
|
|
901 and virtual address should be off by NEW_DATA2_SIZE. */
|
|
|
902 || n == old_sbss_index
|
|
|
903 )
|
|
0
|
904 {
|
|
353
|
905 /* NN should be `old_s?bss_index + 1' at this point. */
|
|
|
906 NEW_SECTION_H (nn).sh_offset =
|
|
|
907 NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size;
|
|
|
908 NEW_SECTION_H (nn).sh_addr =
|
|
|
909 NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size;
|
|
0
|
910 /* Let the new bss section address alignment be the same as the
|
|
|
911 section address alignment followed the old bss section, so
|
|
|
912 this section will be placed in exactly the same place. */
|
|
|
913 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
|
|
|
914 NEW_SECTION_H (nn).sh_size = 0;
|
|
|
915 }
|
|
|
916 else
|
|
|
917 {
|
|
|
918 /* Any section that was original placed AFTER the bss
|
|
|
919 section should now be off by NEW_DATA2_SIZE. */
|
|
|
920 #ifdef SOLARIS_POWERPC
|
|
|
921 /* On PPC Reference Platform running Solaris 2.5.1
|
|
|
922 the plt section is also of type NOBI like the bss section.
|
|
|
923 (not really stored) and therefore sections after the bss
|
|
|
924 section start at the plt offset. The plt section is always
|
|
|
925 the one just before the bss section.
|
|
|
926 It would be better to put the new data section before
|
|
|
927 the .plt section, or use libelf instead.
|
|
|
928 Erik Deumens, deumens@qtp.ufl.edu. */
|
|
|
929 if (NEW_SECTION_H (nn).sh_offset
|
|
|
930 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
|
|
|
931 NEW_SECTION_H (nn).sh_offset += new_data2_size;
|
|
|
932 #else
|
|
353
|
933 if (round_up (NEW_SECTION_H (nn).sh_offset,
|
|
|
934 OLD_SECTION_H (old_bss_index).sh_addralign)
|
|
|
935 >= new_data2_offset)
|
|
0
|
936 NEW_SECTION_H (nn).sh_offset += new_data2_size;
|
|
|
937 #endif
|
|
|
938 /* Any section that was originally placed after the section
|
|
|
939 header table should now be off by the size of one section
|
|
|
940 header table entry. */
|
|
|
941 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
|
|
|
942 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
|
|
|
943 }
|
|
|
944
|
|
|
945 /* If any section hdr refers to the section after the new .data
|
|
|
946 section, make it refer to next one because we have inserted
|
|
|
947 a new section in between. */
|
|
|
948
|
|
|
949 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
|
|
|
950 /* For symbol tables, info is a symbol table index,
|
|
|
951 so don't change it. */
|
|
|
952 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
|
|
|
953 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
|
|
|
954 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
|
|
|
955
|
|
|
956 /* Now, start to copy the content of sections. */
|
|
|
957 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
|
|
|
958 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
|
|
|
959 continue;
|
|
|
960
|
|
|
961 /* Write out the sections. .data and .data1 (and data2, called
|
|
|
962 ".data" in the strings table) get copied from the current process
|
|
|
963 instead of the old file. */
|
|
|
964 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
|
|
|
965 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
353
|
966 ".sdata")
|
|
|
967 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
|
968 ".lit4")
|
|
|
969 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
|
970 ".lit8")
|
|
|
971 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
|
972 ".sdata1")
|
|
|
973 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
0
|
974 ".data1"))
|
|
|
975 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
|
|
|
976 else
|
|
|
977 src = old_base + OLD_SECTION_H (n).sh_offset;
|
|
|
978
|
|
|
979 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
|
|
|
980 NEW_SECTION_H (nn).sh_size);
|
|
|
981
|
|
353
|
982 #ifdef __alpha__
|
|
|
983 /* Update Alpha COFF symbol table: */
|
|
|
984 if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
|
|
|
985 == 0)
|
|
|
986 {
|
|
|
987 pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
|
|
|
988
|
|
|
989 symhdr->cbLineOffset += new_data2_size;
|
|
|
990 symhdr->cbDnOffset += new_data2_size;
|
|
|
991 symhdr->cbPdOffset += new_data2_size;
|
|
|
992 symhdr->cbSymOffset += new_data2_size;
|
|
|
993 symhdr->cbOptOffset += new_data2_size;
|
|
|
994 symhdr->cbAuxOffset += new_data2_size;
|
|
|
995 symhdr->cbSsOffset += new_data2_size;
|
|
|
996 symhdr->cbSsExtOffset += new_data2_size;
|
|
|
997 symhdr->cbFdOffset += new_data2_size;
|
|
|
998 symhdr->cbRfdOffset += new_data2_size;
|
|
|
999 symhdr->cbExtOffset += new_data2_size;
|
|
|
1000 }
|
|
|
1001 #endif /* __alpha__ */
|
|
|
1002
|
|
|
1003 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
|
|
359
|
1004 if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG
|
|
|
1005 && old_mdebug_index != -1)
|
|
353
|
1006 {
|
|
|
1007 int diff = NEW_SECTION_H(nn).sh_offset
|
|
|
1008 - OLD_SECTION_H(old_mdebug_index).sh_offset;
|
|
|
1009 HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
|
|
|
1010
|
|
|
1011 if (diff)
|
|
|
1012 {
|
|
|
1013 phdr->cbLineOffset += diff;
|
|
|
1014 phdr->cbDnOffset += diff;
|
|
|
1015 phdr->cbPdOffset += diff;
|
|
|
1016 phdr->cbSymOffset += diff;
|
|
|
1017 phdr->cbOptOffset += diff;
|
|
|
1018 phdr->cbAuxOffset += diff;
|
|
|
1019 phdr->cbSsOffset += diff;
|
|
|
1020 phdr->cbSsExtOffset += diff;
|
|
|
1021 phdr->cbFdOffset += diff;
|
|
|
1022 phdr->cbRfdOffset += diff;
|
|
|
1023 phdr->cbExtOffset += diff;
|
|
|
1024 }
|
|
|
1025 }
|
|
|
1026 #endif /* __sony_news && _SYSTYPE_SYSV */
|
|
|
1027
|
|
357
|
1028 #ifdef __sgi
|
|
353
|
1029 /* Adjust the HDRR offsets in .mdebug and copy the
|
|
|
1030 line data if it's in its usual 'hole' in the object.
|
|
|
1031 Makes the new file debuggable with dbx.
|
|
|
1032 patches up two problems: the absolute file offsets
|
|
|
1033 in the HDRR record of .mdebug (see /usr/include/syms.h), and
|
|
|
1034 the ld bug that gets the line table in a hole in the
|
|
|
1035 elf file rather than in the .mdebug section proper.
|
|
|
1036 David Anderson. davea@sgi.com Jan 16,1994. */
|
|
|
1037 if (n == old_mdebug_index)
|
|
|
1038 {
|
|
|
1039 #define MDEBUGADJUST(__ct,__fileaddr) \
|
|
|
1040 if (n_phdrr->__ct > 0) \
|
|
|
1041 { \
|
|
|
1042 n_phdrr->__fileaddr += movement; \
|
|
|
1043 }
|
|
|
1044
|
|
|
1045 HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset);
|
|
|
1046 HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset);
|
|
|
1047 unsigned movement = new_data2_size;
|
|
|
1048
|
|
|
1049 MDEBUGADJUST (idnMax, cbDnOffset);
|
|
|
1050 MDEBUGADJUST (ipdMax, cbPdOffset);
|
|
|
1051 MDEBUGADJUST (isymMax, cbSymOffset);
|
|
|
1052 MDEBUGADJUST (ioptMax, cbOptOffset);
|
|
|
1053 MDEBUGADJUST (iauxMax, cbAuxOffset);
|
|
|
1054 MDEBUGADJUST (issMax, cbSsOffset);
|
|
|
1055 MDEBUGADJUST (issExtMax, cbSsExtOffset);
|
|
|
1056 MDEBUGADJUST (ifdMax, cbFdOffset);
|
|
|
1057 MDEBUGADJUST (crfd, cbRfdOffset);
|
|
|
1058 MDEBUGADJUST (iextMax, cbExtOffset);
|
|
|
1059 /* The Line Section, being possible off in a hole of the object,
|
|
|
1060 requires special handling. */
|
|
|
1061 if (n_phdrr->cbLine > 0)
|
|
|
1062 {
|
|
|
1063 if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset
|
|
|
1064 + OLD_SECTION_H (n).sh_size))
|
|
|
1065 {
|
|
|
1066 /* line data is in a hole in elf. do special copy and adjust
|
|
|
1067 for this ld mistake.
|
|
|
1068 */
|
|
|
1069 n_phdrr->cbLineOffset += movement;
|
|
|
1070
|
|
|
1071 memcpy (n_phdrr->cbLineOffset + new_base,
|
|
|
1072 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
|
|
|
1073 }
|
|
|
1074 else
|
|
|
1075 {
|
|
|
1076 /* somehow line data is in .mdebug as it is supposed to be. */
|
|
|
1077 MDEBUGADJUST (cbLine, cbLineOffset);
|
|
|
1078 }
|
|
|
1079 }
|
|
|
1080 }
|
|
|
1081 #endif /* __sgi */
|
|
|
1082
|
|
0
|
1083 /* If it is the symbol table, its st_shndx field needs to be patched. */
|
|
|
1084 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
|
|
|
1085 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
|
|
|
1086 {
|
|
255
|
1087 ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
|
|
0
|
1088 unsigned int num = spt->sh_size / spt->sh_entsize;
|
|
255
|
1089 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
|
|
0
|
1090 new_base);
|
|
|
1091 for (; num--; sym++)
|
|
|
1092 {
|
|
|
1093 if ((sym->st_shndx == SHN_UNDEF)
|
|
|
1094 || (sym->st_shndx == SHN_ABS)
|
|
|
1095 || (sym->st_shndx == SHN_COMMON))
|
|
|
1096 continue;
|
|
|
1097
|
|
|
1098 PATCH_INDEX (sym->st_shndx);
|
|
|
1099 }
|
|
|
1100 }
|
|
|
1101 }
|
|
|
1102
|
|
|
1103 /* Update the symbol values of _edata and _end. */
|
|
|
1104 for (n = new_file_h->e_shnum - 1; n; n--)
|
|
|
1105 {
|
|
|
1106 byte *symnames;
|
|
255
|
1107 ElfW(Sym) *symp, *symendp;
|
|
0
|
1108
|
|
|
1109 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
|
|
|
1110 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
|
|
|
1111 continue;
|
|
|
1112
|
|
|
1113 symnames = ((byte *) new_base
|
|
|
1114 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
|
|
255
|
1115 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
|
|
|
1116 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
|
|
0
|
1117
|
|
|
1118 for (; symp < symendp; symp ++)
|
|
|
1119 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
|
|
318
|
1120 || strcmp ((char *) (symnames + symp->st_name), "end") == 0
|
|
|
1121 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
|
|
|
1122 || strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
|
|
0
|
1123 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
|
|
|
1124 }
|
|
|
1125
|
|
|
1126 /* This loop seeks out relocation sections for the data section, so
|
|
|
1127 that it can undo relocations performed by the runtime linker. */
|
|
|
1128 for (n = new_file_h->e_shnum - 1; n; n--)
|
|
|
1129 {
|
|
255
|
1130 ElfW(Shdr) section = NEW_SECTION_H (n);
|
|
0
|
1131 switch (section.sh_type) {
|
|
|
1132 default:
|
|
|
1133 break;
|
|
|
1134 case SHT_REL:
|
|
|
1135 case SHT_RELA:
|
|
|
1136 /* This code handles two different size structs, but there should
|
|
|
1137 be no harm in that provided that r_offset is always the first
|
|
|
1138 member. */
|
|
|
1139 nn = section.sh_info;
|
|
|
1140 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
|
|
|
1141 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
353
|
1142 ".sdata")
|
|
357
|
1143 #ifdef __sgi
|
|
353
|
1144 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
1145 ".lit4")
|
|
|
1146 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
1147 ".lit8")
|
|
|
1148 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
1149 ".got")
|
|
357
|
1150 #endif
|
|
353
|
1151 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
1152 ".sdata1")
|
|
|
1153 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
0
|
1154 ".data1"))
|
|
|
1155 {
|
|
255
|
1156 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr -
|
|
0
|
1157 NEW_SECTION_H (nn).sh_offset;
|
|
|
1158 caddr_t reloc = old_base + section.sh_offset, end;
|
|
|
1159 for (end = reloc + section.sh_size; reloc < end;
|
|
|
1160 reloc += section.sh_entsize)
|
|
|
1161 {
|
|
255
|
1162 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
|
|
353
|
1163 #ifdef __alpha__
|
|
|
1164 /* The Alpha ELF binutils currently have a bug that
|
|
|
1165 sometimes results in relocs that contain all
|
|
|
1166 zeroes. Work around this for now... */
|
|
|
1167 if (((ElfW(Rel) *) reloc)->r_offset == 0)
|
|
|
1168 continue;
|
|
|
1169 #endif
|
|
255
|
1170 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
|
|
0
|
1171 }
|
|
|
1172 }
|
|
|
1173 break;
|
|
|
1174 }
|
|
|
1175 }
|
|
|
1176
|
|
|
1177 #ifdef UNEXEC_USE_MAP_PRIVATE
|
|
|
1178 if (lseek (new_file, 0, SEEK_SET) == -1)
|
|
|
1179 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
|
|
|
1180
|
|
|
1181 if (write (new_file, new_base, new_file_size) != new_file_size)
|
|
|
1182 fatal ("Can't write (%s): errno %d\n", new_name, errno);
|
|
|
1183 #endif
|
|
|
1184
|
|
|
1185 /* Close the files and make the new file executable. */
|
|
|
1186
|
|
|
1187 if (close (old_file))
|
|
|
1188 fatal ("Can't close (%s): errno %d\n", old_name, errno);
|
|
|
1189
|
|
|
1190 if (close (new_file))
|
|
|
1191 fatal ("Can't close (%s): errno %d\n", new_name, errno);
|
|
|
1192
|
|
|
1193 if (stat (new_name, &stat_buf) == -1)
|
|
|
1194 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
|
|
|
1195
|
|
|
1196 n = umask (777);
|
|
|
1197 umask (n);
|
|
|
1198 stat_buf.st_mode |= 0111 & ~n;
|
|
|
1199 if (chmod (new_name, stat_buf.st_mode) == -1)
|
|
|
1200 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
|
|
|
1201 }
|
