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1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992
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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 /*
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25 * unexec.c - Convert a running program into an a.out file.
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26 *
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27 * Author: Spencer W. Thomas
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28 * Computer Science Dept.
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29 * University of Utah
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30 * Date: Tue Mar 2 1982
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31 * Modified heavily since then.
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32 *
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33 * Synopsis:
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34 * unexec (new_name, a_name, data_start, bss_start, entry_address)
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35 * char *new_name, *a_name;
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36 * unsigned data_start, bss_start, entry_address;
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37 *
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38 * Takes a snapshot of the program and makes an a.out format file in the
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39 * file named by the string argument new_name.
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40 * If a_name is non-NULL, the symbol table will be taken from the given file.
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41 * On some machines, an existing a_name file is required.
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42 *
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43 * The boundaries within the a.out file may be adjusted with the data_start
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44 * and bss_start arguments. Either or both may be given as 0 for defaults.
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45 *
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46 * Data_start gives the boundary between the text segment and the data
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47 * segment of the program. The text segment can contain shared, read-only
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48 * program code and literal data, while the data segment is always unshared
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49 * and unprotected. Data_start gives the lowest unprotected address.
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50 * The value you specify may be rounded down to a suitable boundary
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51 * as required by the machine you are using.
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52 *
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53 * Specifying zero for data_start means the boundary between text and data
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54 * should not be the same as when the program was loaded.
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55 * If NO_REMAP is defined, the argument data_start is ignored and the
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56 * segment boundaries are never changed.
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57 *
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58 * Bss_start indicates how much of the data segment is to be saved in the
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59 * a.out file and restored when the program is executed. It gives the lowest
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60 * unsaved address, and is rounded up to a page boundary. The default when 0
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61 * is given assumes that the entire data segment is to be stored, including
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62 * the previous data and bss as well as any additional storage allocated with
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63 * break (2).
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64 *
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65 * The new file is set up to start at entry_address.
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66 *
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67 * If you make improvements I'd like to get them too.
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68 * harpo!utah-cs!thomas, thomas@Utah-20
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69 *
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70 */
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71
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72 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
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73 * ELF support added.
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74 *
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75 * Basic theory: the data space of the running process needs to be
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76 * dumped to the output file. Normally we would just enlarge the size
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77 * of .data, scooting everything down. But we can't do that in ELF,
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78 * because there is often something between the .data space and the
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79 * .bss space.
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80 *
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81 * In the temacs dump below, notice that the Global Offset Table
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82 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
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83 * .bss. It does not work to overlap .data with these fields.
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84 *
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85 * The solution is to create a new .data segment. This segment is
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86 * filled with data from the current process. Since the contents of
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87 * various sections refer to sections by index, the new .data segment
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88 * is made the last in the table to avoid changing any existing index.
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89
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90 * This is an example of how the section headers are changed. "Addr"
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91 * is a process virtual address. "Offset" is a file offset.
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92
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93 raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
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94
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95 temacs:
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96
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97 **** SECTION HEADER TABLE ****
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98 [No] Type Flags Addr Offset Size Name
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99 Link Info Adralgn Entsize
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100
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101 [1] 1 2 0x80480d4 0xd4 0x13 .interp
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102 0 0 0x1 0
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103
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104 [2] 5 2 0x80480e8 0xe8 0x388 .hash
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105 3 0 0x4 0x4
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106
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107 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
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108 4 1 0x4 0x10
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109
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110 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
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111 0 0 0x1 0
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112
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113 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
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114 3 7 0x4 0x8
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115
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116 [6] 1 6 0x8049348 0x1348 0x3 .init
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117 0 0 0x4 0
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118
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119 [7] 1 6 0x804934c 0x134c 0x680 .plt
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120 0 0 0x4 0x4
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121
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122 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
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123 0 0 0x4 0
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124
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125 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
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126 0 0 0x4 0
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127
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128 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
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129 0 0 0x4 0
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130
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131 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
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132 0 0 0x4 0
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133
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134 [12] 1 3 0x8088330 0x3f330 0x20afc .data
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135 0 0 0x4 0
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136
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137 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
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138 0 0 0x4 0
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139
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140 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
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141 0 0 0x4 0x4
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142
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143 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
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144 4 0 0x4 0x8
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145
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146 [16] 8 3 0x80a98f4 0x608f4 0x449c .bss
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147 0 0 0x4 0
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148
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149 [17] 2 0 0 0x608f4 0x9b90 .symtab
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150 18 371 0x4 0x10
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151
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152 [18] 3 0 0 0x6a484 0x8526 .strtab
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153 0 0 0x1 0
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154
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155 [19] 3 0 0 0x729aa 0x93 .shstrtab
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156 0 0 0x1 0
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157
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158 [20] 1 0 0 0x72a3d 0x68b7 .comment
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159 0 0 0x1 0
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160
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161 raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
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162
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163 xemacs:
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164
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165 **** SECTION HEADER TABLE ****
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166 [No] Type Flags Addr Offset Size Name
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167 Link Info Adralgn Entsize
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168
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169 [1] 1 2 0x80480d4 0xd4 0x13 .interp
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170 0 0 0x1 0
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171
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172 [2] 5 2 0x80480e8 0xe8 0x388 .hash
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173 3 0 0x4 0x4
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174
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175 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
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176 4 1 0x4 0x10
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177
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178 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
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179 0 0 0x1 0
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180
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181 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
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182 3 7 0x4 0x8
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183
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184 [6] 1 6 0x8049348 0x1348 0x3 .init
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185 0 0 0x4 0
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186
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187 [7] 1 6 0x804934c 0x134c 0x680 .plt
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188 0 0 0x4 0x4
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189
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190 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
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191 0 0 0x4 0
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192
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193 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
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194 0 0 0x4 0
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195
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196 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
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197 0 0 0x4 0
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198
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199 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
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200 0 0 0x4 0
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201
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202 [12] 1 3 0x8088330 0x3f330 0x20afc .data
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203 0 0 0x4 0
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204
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205 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
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206 0 0 0x4 0
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207
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208 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
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209 0 0 0x4 0x4
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210
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211 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
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212 4 0 0x4 0x8
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213
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214 [16] 8 3 0x80c6800 0x7d800 0 .bss
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215 0 0 0x4 0
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216
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217 [17] 2 0 0 0x7d800 0x9b90 .symtab
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218 18 371 0x4 0x10
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219
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220 [18] 3 0 0 0x87390 0x8526 .strtab
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221 0 0 0x1 0
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222
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223 [19] 3 0 0 0x8f8b6 0x93 .shstrtab
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224 0 0 0x1 0
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225
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226 [20] 1 0 0 0x8f949 0x68b7 .comment
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227 0 0 0x1 0
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228
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229 [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
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230 0 0 0x4 0
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231
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232 * This is an example of how the file header is changed. "Shoff" is
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233 * the section header offset within the file. Since that table is
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234 * after the new .data section, it is moved. "Shnum" is the number of
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235 * sections, which we increment.
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236 *
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237 * "Phoff" is the file offset to the program header. "Phentsize" and
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238 * "Shentsz" are the program and section header entries sizes respectively.
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239 * These can be larger than the apparent struct sizes.
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240
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241 raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
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242
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243 temacs:
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244
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245 **** ELF HEADER ****
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246 Class Data Type Machine Version
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247 Entry Phoff Shoff Flags Ehsize
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248 Phentsize Phnum Shentsz Shnum Shstrndx
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249
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250 1 1 2 3 1
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251 0x80499cc 0x34 0x792f4 0 0x34
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252 0x20 5 0x28 21 19
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253
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254 raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
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255
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256 xemacs:
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257
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258 **** ELF HEADER ****
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259 Class Data Type Machine Version
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260 Entry Phoff Shoff Flags Ehsize
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261 Phentsize Phnum Shentsz Shnum Shstrndx
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262
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263 1 1 2 3 1
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264 0x80499cc 0x34 0x96200 0 0x34
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265 0x20 5 0x28 22 19
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266
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267 * These are the program headers. "Offset" is the file offset to the
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268 * segment. "Vaddr" is the memory load address. "Filesz" is the
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269 * segment size as it appears in the file, and "Memsz" is the size in
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270 * memory. Below, the third segment is the code and the fourth is the
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271 * data: the difference between Filesz and Memsz is .bss
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272
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273 raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
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274
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275 temacs:
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276 ***** PROGRAM EXECUTION HEADER *****
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277 Type Offset Vaddr Paddr
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278 Filesz Memsz Flags Align
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279
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280 6 0x34 0x8048034 0
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281 0xa0 0xa0 5 0
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282
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283 3 0xd4 0 0
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284 0x13 0 4 0
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285
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286 1 0x34 0x8048034 0
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287 0x3f2f9 0x3f2f9 5 0x1000
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288
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289 1 0x3f330 0x8088330 0
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290 0x215c4 0x25a60 7 0x1000
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291
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292 2 0x60874 0x80a9874 0
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293 0x80 0 7 0
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294
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295 raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
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296
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297 xemacs:
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298 ***** PROGRAM EXECUTION HEADER *****
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299 Type Offset Vaddr Paddr
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300 Filesz Memsz Flags Align
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301
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302 6 0x34 0x8048034 0
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303 0xa0 0xa0 5 0
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304
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305 3 0xd4 0 0
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306 0x13 0 4 0
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307
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308 1 0x34 0x8048034 0
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309 0x3f2f9 0x3f2f9 5 0x1000
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310
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311 1 0x3f330 0x8088330 0
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312 0x3e4d0 0x3e4d0 7 0x1000
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313
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314 2 0x60874 0x80a9874 0
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315 0x80 0 7 0
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316
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317
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318 */
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319
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320 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
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321 *
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322 * The above mechanism does not work if the unexeced ELF file is being
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323 * re-layout by other applications (such as `strip'). All the applications
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324 * that re-layout the internal of ELF will layout all sections in ascending
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325 * order of their file offsets. After the re-layout, the data2 section will
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326 * still be the LAST section in the section header vector, but its file offset
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327 * is now being pushed far away down, and causes part of it not to be mapped
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328 * in (ie. not covered by the load segment entry in PHDR vector), therefore
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329 * causes the new binary to fail.
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330 *
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331 * The solution is to modify the unexec algorithm to insert the new data2
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332 * section header right before the new bss section header, so their file
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333 * offsets will be in the ascending order. Since some of the section's (all
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334 * sections AFTER the bss section) indexes are now changed, we also need to
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335 * modify some fields to make them point to the right sections. This is done
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336 * by macro PATCH_INDEX. All the fields that need to be patched are:
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337 *
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338 * 1. ELF header e_shstrndx field.
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339 * 2. section header sh_link and sh_info field.
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340 * 3. symbol table entry st_shndx field.
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341 *
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342 * The above example now should look like:
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343
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344 **** SECTION HEADER TABLE ****
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345 [No] Type Flags Addr Offset Size Name
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346 Link Info Adralgn Entsize
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347
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348 [1] 1 2 0x80480d4 0xd4 0x13 .interp
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349 0 0 0x1 0
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350
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351 [2] 5 2 0x80480e8 0xe8 0x388 .hash
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352 3 0 0x4 0x4
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353
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354 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
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355 4 1 0x4 0x10
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356
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357 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
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358 0 0 0x1 0
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359
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360 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
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361 3 7 0x4 0x8
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362
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363 [6] 1 6 0x8049348 0x1348 0x3 .init
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364 0 0 0x4 0
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365
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366 [7] 1 6 0x804934c 0x134c 0x680 .plt
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367 0 0 0x4 0x4
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368
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369 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
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370 0 0 0x4 0
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371
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372 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
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373 0 0 0x4 0
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374
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375 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
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376 0 0 0x4 0
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377
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378 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
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379 0 0 0x4 0
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380
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381 [12] 1 3 0x8088330 0x3f330 0x20afc .data
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382 0 0 0x4 0
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383
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384 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
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385 0 0 0x4 0
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386
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387 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
|
|
|
388 0 0 0x4 0x4
|
|
|
389
|
|
|
390 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
|
|
|
391 4 0 0x4 0x8
|
|
|
392
|
|
|
393 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
|
|
|
394 0 0 0x4 0
|
|
|
395
|
|
|
396 [17] 8 3 0x80c6800 0x7d800 0 .bss
|
|
|
397 0 0 0x4 0
|
|
|
398
|
|
|
399 [18] 2 0 0 0x7d800 0x9b90 .symtab
|
|
|
400 19 371 0x4 0x10
|
|
|
401
|
|
|
402 [19] 3 0 0 0x87390 0x8526 .strtab
|
|
|
403 0 0 0x1 0
|
|
|
404
|
|
|
405 [20] 3 0 0 0x8f8b6 0x93 .shstrtab
|
|
|
406 0 0 0x1 0
|
|
|
407
|
|
|
408 [21] 1 0 0 0x8f949 0x68b7 .comment
|
|
|
409 0 0 0x1 0
|
|
|
410
|
|
|
411 */
|
|
|
412
|
|
|
413 /* More mods, by Jack Repenning <jackr@sgi.com>, Fri Aug 11 15:45:52 1995
|
|
|
414
|
|
|
415 Same algorithm as immediately above. However, the detailed
|
|
|
416 calculations of the various locations needed significant
|
|
|
417 overhaul.
|
|
|
418
|
|
|
419 At the point of the old .bss, the file offsets and the memory
|
|
|
420 addresses do distinct, slightly snaky things:
|
|
|
421
|
|
|
422 offset of .bss is meaningless and unpredictable
|
|
|
423 addr of .bss is meaningful
|
|
|
424 alignment of .bss is important to addr, so there may be a small
|
|
|
425 gap in address range before start of bss
|
|
|
426 offset of next section is rounded up modulo 0x1000
|
|
|
427 the hole so-introduced is zero-filled, so it can be mapped in as
|
|
|
428 the first partial-page of bss (the rest of the bss is mapped from
|
|
|
429 /dev/zero)
|
|
|
430 I suppose you could view this not as a hole, but as the beginning
|
|
|
431 of the bss, actually present in the file. But you should not
|
|
|
432 push that worldview too far, as the linker still knows that the
|
|
|
433 "offset" claimed for the bss is unused, and seems not always
|
|
|
434 careful about setting it.
|
|
|
435
|
|
|
436 We are doing all our tricks at this same rather complicated
|
|
|
437 location (isn't life fun?):
|
|
|
438
|
|
|
439 insert a new data section to contain now-initialized old bss and
|
|
|
440 heap
|
|
|
441 define a zero-length bss just so there is one
|
|
|
442
|
|
|
443 The offset of the new data section is dictated by its current
|
|
|
444 address (which, of course, we want also to be its addr): the
|
|
|
445 loader maps in the whole file region containing old data, rodata,
|
|
|
446 got, and new data as a single mapped segment, starting at the
|
|
|
447 address of the first chunk; the rest have to be laid out in the
|
|
|
448 file such that the map into the right spots. That is:
|
|
|
449
|
|
|
450 offset(newdata) ==
|
|
|
451 addrInRunningMemory(newdata)-aIRM(olddata)
|
|
|
452 + offset(oldData)
|
|
|
453
|
|
|
454 This would not necessarily match the oldbss offset, even if it
|
|
|
455 were carefully calculated! We must compute this.
|
|
|
456
|
|
|
457 The linker that built temacs has also already arranged that
|
|
|
458 olddata is properly page-aligned (not necessarily beginning on a
|
|
|
459 page, but rather that a page's worth of the low bits of addr and
|
|
|
460 offset match). We preserve this.
|
|
|
461
|
|
|
462 addr(bss) is alignment-constrained from the end of the new data.
|
|
|
463 Since we base endof(newdata) on sbrk(), we have a page boundary
|
|
|
464 (in both offset and addr) and meet any alignment constraint,
|
|
|
465 needing no alignment adjustment of this location and no
|
|
|
466 mini-hole. Or, if you like, we've allowed sbrk() to "compute"
|
|
|
467 the mini-hole size for us.
|
|
|
468
|
|
|
469 That puts newbss beginning on a page boundary, both in offset and
|
|
|
470 addr. (offset(bss) is still meaningless, but what the heck,
|
|
|
471 we'll fix it up.)
|
|
|
472
|
|
|
473 Since newbss has zero length, and its offset (however
|
|
|
474 meaningless) is page aligned, we place the next section exactly
|
|
|
475 there, with no hole needed to restore page alignment.
|
|
|
476
|
|
|
477 So, the shift for all sections beyond the playing field is:
|
|
|
478
|
|
|
479 new_bss_addr - roundup(old_bss_addr,0x1000)
|
|
|
480
|
|
|
481 */
|
|
|
482
|
|
|
483
|
|
|
484 #include <sys/types.h>
|
|
|
485 #include <stdio.h>
|
|
|
486 #include <sys/stat.h>
|
|
|
487 #include <memory.h>
|
|
|
488 #include <string.h>
|
|
|
489 #include <errno.h>
|
|
|
490 #include <unistd.h>
|
|
|
491 #include <fcntl.h>
|
|
|
492 #include <elf.h>
|
|
|
493 #include <sym.h> /* for HDRR declaration */
|
|
|
494 #include <sys/mman.h>
|
|
|
495
|
|
|
496 #ifndef emacs
|
|
|
497 #define fatal(a, b, c) fprintf(stderr, a, b, c), exit(1)
|
|
|
498 #else
|
|
|
499 extern void fatal(char *, ...);
|
|
|
500 #endif
|
|
|
501
|
|
|
502 /* Get the address of a particular section or program header entry,
|
|
|
503 * accounting for the size of the entries.
|
|
|
504 */
|
|
|
505
|
|
|
506 #define OLD_SECTION_H(n) \
|
|
|
507 (*(Elf32_Shdr *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
|
|
|
508 #define NEW_SECTION_H(n) \
|
|
|
509 (*(Elf32_Shdr *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
|
|
|
510 #define OLD_PROGRAM_H(n) \
|
|
|
511 (*(Elf32_Phdr *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
|
|
|
512 #define NEW_PROGRAM_H(n) \
|
|
|
513 (*(Elf32_Phdr *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
|
|
|
514
|
|
|
515 #define PATCH_INDEX(n) \
|
|
|
516 do { \
|
|
|
517 if ((n) >= old_bss_index) \
|
|
|
518 (n)++; } while (0)
|
|
|
519 typedef unsigned char byte;
|
|
|
520
|
|
|
521 /* Round X up to a multiple of Y. */
|
|
|
522
|
|
|
523 int
|
|
|
524 round_up (x, y)
|
|
|
525 int x, y;
|
|
|
526 {
|
|
|
527 int rem = x % y;
|
|
|
528 if (rem == 0)
|
|
|
529 return x;
|
|
|
530 return x - rem + y;
|
|
|
531 }
|
|
|
532
|
|
|
533 /* Return the index of the section named NAME.
|
|
|
534 SECTION_NAMES, FILE_NAME and FILE_H give information
|
|
|
535 about the file we are looking in.
|
|
|
536
|
|
|
537 If we don't find the section NAME, that is a fatal error
|
|
|
538 if NOERROR is 0; we return -1 if NOERROR is nonzero. */
|
|
|
539
|
|
|
540 static int
|
|
|
541 find_section (name, section_names, file_name, old_file_h, old_section_h, noerror)
|
|
|
542 char *name;
|
|
|
543 char *section_names;
|
|
|
544 char *file_name;
|
|
|
545 Elf32_Ehdr *old_file_h;
|
|
|
546 Elf32_Shdr *old_section_h;
|
|
|
547 int noerror;
|
|
|
548 {
|
|
|
549 int idx;
|
|
|
550
|
|
|
551 for (idx = 1; idx < old_file_h->e_shnum; idx++)
|
|
|
552 {
|
|
|
553 #ifdef DEBUG
|
|
|
554 fprintf (stderr, "Looking for %s - found %s\n", name,
|
|
|
555 section_names + OLD_SECTION_H (idx).sh_name);
|
|
|
556 #endif
|
|
|
557 if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
|
|
|
558 name))
|
|
|
559 break;
|
|
|
560 }
|
|
|
561 if (idx == old_file_h->e_shnum)
|
|
|
562 {
|
|
|
563 if (noerror)
|
|
|
564 return -1;
|
|
|
565 else
|
|
|
566 fatal ("Can't find .bss in %s.\n", file_name, 0);
|
|
|
567 }
|
|
|
568
|
|
|
569 return idx;
|
|
|
570 }
|
|
|
571
|
|
|
572 /* ****************************************************************
|
|
|
573 * unexec
|
|
|
574 *
|
|
|
575 * driving logic.
|
|
|
576 *
|
|
|
577 * In ELF, this works by replacing the old .bss section with a new
|
|
|
578 * .data section, and inserting an empty .bss immediately afterwards.
|
|
|
579 *
|
|
|
580 */
|
|
|
581 void
|
|
|
582 unexec (new_name, old_name, data_start, bss_start, entry_address)
|
|
|
583 char *new_name, *old_name;
|
|
|
584 unsigned data_start, bss_start, entry_address;
|
|
|
585 {
|
|
|
586 extern unsigned int bss_end;
|
|
|
587 int new_file, old_file, new_file_size;
|
|
|
588
|
|
|
589 /* Pointers to the base of the image of the two files. */
|
|
|
590 caddr_t old_base, new_base;
|
|
|
591
|
|
|
592 /* Pointers to the file, program and section headers for the old and new
|
|
|
593 files. */
|
|
|
594 Elf32_Ehdr *old_file_h, *new_file_h;
|
|
|
595 Elf32_Phdr *old_program_h, *new_program_h;
|
|
|
596 Elf32_Shdr *old_section_h, *new_section_h;
|
|
|
597
|
|
|
598 /* Point to the section name table in the old file. */
|
|
|
599 char *old_section_names;
|
|
|
600
|
|
|
601 Elf32_Addr old_bss_addr, new_bss_addr;
|
|
|
602 Elf32_Word old_bss_size, new_data2_size;
|
|
|
603 Elf32_Off new_data2_offset;
|
|
|
604 Elf32_Addr new_data2_addr;
|
|
|
605 Elf32_Addr new_offsets_shift;
|
|
|
606
|
|
|
607 int n, nn, old_bss_index, old_data_index, new_data2_index;
|
|
|
608 int old_mdebug_index;
|
|
|
609 struct stat stat_buf;
|
|
|
610
|
|
|
611 /* Open the old file & map it into the address space. */
|
|
|
612
|
|
|
613 old_file = open (old_name, O_RDONLY);
|
|
|
614
|
|
|
615 if (old_file < 0)
|
|
|
616 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
|
|
|
617
|
|
|
618 if (fstat (old_file, &stat_buf) == -1)
|
|
|
619 fatal ("Can't fstat(%s): errno %d\n", old_name, errno);
|
|
|
620
|
|
|
621 old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0);
|
|
|
622
|
|
|
623 if (old_base == (caddr_t) -1)
|
|
|
624 fatal ("Can't mmap(%s): errno %d\n", old_name, errno);
|
|
|
625
|
|
|
626 #ifdef DEBUG
|
|
|
627 fprintf (stderr, "mmap(%s, %x) -> %x\n", old_name, stat_buf.st_size,
|
|
|
628 old_base);
|
|
|
629 #endif
|
|
|
630
|
|
|
631 /* Get pointers to headers & section names. */
|
|
|
632
|
|
|
633 old_file_h = (Elf32_Ehdr *) old_base;
|
|
|
634 old_program_h = (Elf32_Phdr *) ((byte *) old_base + old_file_h->e_phoff);
|
|
|
635 old_section_h = (Elf32_Shdr *) ((byte *) old_base + old_file_h->e_shoff);
|
|
|
636 old_section_names
|
|
|
637 = (char *) old_base + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
|
|
|
638
|
|
|
639 /* Find the mdebug section, if any. */
|
|
|
640
|
|
|
641 old_mdebug_index = find_section (".mdebug", old_section_names,
|
|
|
642 old_name, old_file_h, old_section_h, 1);
|
|
|
643
|
|
|
644 /* Find the old .bss section. */
|
|
|
645
|
|
|
646 old_bss_index = find_section (".bss", old_section_names,
|
|
|
647 old_name, old_file_h, old_section_h, 0);
|
|
|
648
|
|
|
649 /* Find the old .data section. Figure out parameters of
|
|
|
650 the new data2 and bss sections. */
|
|
|
651
|
|
|
652 old_data_index = find_section (".data", old_section_names,
|
|
|
653 old_name, old_file_h, old_section_h, 0);
|
|
|
654
|
|
|
655 old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
|
|
|
656 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
|
|
|
657 #if defined(emacs) || !defined(DEBUG)
|
|
|
658 bss_end = (unsigned int) sbrk (0);
|
|
|
659 new_bss_addr = (Elf32_Addr) bss_end;
|
|
|
660 #else
|
|
|
661 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
|
|
|
662 #endif
|
|
|
663 new_data2_addr = old_bss_addr;
|
|
|
664 new_data2_size = new_bss_addr - old_bss_addr;
|
|
|
665 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
|
|
|
666 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
|
|
|
667 new_offsets_shift = new_bss_addr -
|
|
|
668 ((old_bss_addr & ~0xfff) + ((old_bss_addr & 0xfff) ? 0x1000 : 0));
|
|
|
669
|
|
|
670 #ifdef DEBUG
|
|
|
671 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
|
|
|
672 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
|
|
|
673 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
|
|
|
674 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
|
|
|
675 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
|
|
|
676 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
|
|
|
677 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
|
|
|
678 fprintf (stderr, "new_offsets_shift %x\n", new_offsets_shift);
|
|
|
679 #endif
|
|
|
680
|
|
|
681 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
|
|
|
682 fatal (".bss shrank when undumping???\n", 0, 0);
|
|
|
683
|
|
|
684 /* Set the output file to the right size and mmap it. Set
|
|
|
685 pointers to various interesting objects. stat_buf still has
|
|
|
686 old_file data. */
|
|
|
687
|
|
|
688 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
|
|
|
689 if (new_file < 0)
|
|
|
690 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
|
|
|
691
|
|
|
692 new_file_size = stat_buf.st_size /* old file size */
|
|
|
693 + old_file_h->e_shentsize /* one new section header */
|
|
|
694 + new_offsets_shift; /* trailing section shift */
|
|
|
695
|
|
|
696 if (ftruncate (new_file, new_file_size))
|
|
|
697 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
|
|
|
698
|
|
|
699 new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED,
|
|
|
700 new_file, 0);
|
|
|
701
|
|
|
702 if (new_base == (caddr_t) -1)
|
|
|
703 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
|
|
|
704
|
|
|
705 new_file_h = (Elf32_Ehdr *) new_base;
|
|
|
706 new_program_h = (Elf32_Phdr *) ((byte *) new_base + old_file_h->e_phoff);
|
|
|
707 new_section_h
|
|
|
708 = (Elf32_Shdr *) ((byte *) new_base + old_file_h->e_shoff
|
|
|
709 + new_offsets_shift);
|
|
|
710
|
|
|
711 /* Make our new file, program and section headers as copies of the
|
|
|
712 originals. */
|
|
|
713
|
|
|
714 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
|
|
|
715 memcpy (new_program_h, old_program_h,
|
|
|
716 old_file_h->e_phnum * old_file_h->e_phentsize);
|
|
|
717
|
|
|
718 /* Modify the e_shstrndx if necessary. */
|
|
|
719 PATCH_INDEX (new_file_h->e_shstrndx);
|
|
|
720
|
|
|
721 /* Fix up file header. We'll add one section. Section header is
|
|
|
722 further away now. */
|
|
|
723
|
|
|
724 new_file_h->e_shoff += new_offsets_shift;
|
|
|
725 new_file_h->e_shnum += 1;
|
|
|
726
|
|
|
727 #ifdef DEBUG
|
|
|
728 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
|
|
|
729 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
|
|
|
730 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
|
|
|
731 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
|
|
|
732 #endif
|
|
|
733
|
|
|
734 /* Fix up a new program header. Extend the writable data segment so
|
|
|
735 that the bss area is covered too. Find that segment by looking
|
|
|
736 for a segment that ends just before the .bss area. Make sure
|
|
|
737 that no segments are above the new .data2. Put a loop at the end
|
|
|
738 to adjust the offset and address of any segment that is above
|
|
|
739 data2, just in case we decide to allow this later. */
|
|
|
740
|
|
|
741 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
742 {
|
|
|
743 /* Compute maximum of all requirements for alignment of section. */
|
|
|
744 int alignment = (NEW_PROGRAM_H (n)).p_align;
|
|
|
745 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
|
|
|
746 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
|
|
|
747
|
|
|
748 /* Supposedly this condition is okay for the SGI. */
|
|
|
749 #if 0
|
|
|
750 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz > old_bss_addr)
|
|
|
751 fatal ("Program segment above .bss in %s\n", old_name, 0);
|
|
|
752 #endif
|
|
|
753
|
|
|
754 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
|
|
|
755 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
|
|
|
756 + (NEW_PROGRAM_H (n)).p_filesz,
|
|
|
757 alignment)
|
|
|
758 == round_up (old_bss_addr, alignment)))
|
|
|
759 break;
|
|
|
760 }
|
|
|
761 if (n < 0)
|
|
|
762 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
|
|
|
763
|
|
|
764 NEW_PROGRAM_H (n).p_filesz += new_offsets_shift;
|
|
|
765 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
|
|
|
766
|
|
|
767 #if 1 /* Maybe allow section after data2 - does this ever happen? */
|
|
|
768 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
769 {
|
|
|
770 if (NEW_PROGRAM_H (n).p_vaddr
|
|
|
771 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
|
|
|
772 NEW_PROGRAM_H (n).p_vaddr += new_offsets_shift - old_bss_size;
|
|
|
773
|
|
|
774 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
|
|
|
775 NEW_PROGRAM_H (n).p_offset += new_offsets_shift;
|
|
|
776 }
|
|
|
777 #endif
|
|
|
778
|
|
|
779 /* Fix up section headers based on new .data2 section. Any section
|
|
|
780 whose offset or virtual address is after the new .data2 section
|
|
|
781 gets its value adjusted. .bss size becomes zero and new address
|
|
|
782 is set. data2 section header gets added by copying the existing
|
|
|
783 .data header and modifying the offset, address and size. */
|
|
|
784 for (old_data_index = 1; old_data_index < old_file_h->e_shnum;
|
|
|
785 old_data_index++)
|
|
|
786 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
|
|
|
787 ".data"))
|
|
|
788 break;
|
|
|
789 if (old_data_index == old_file_h->e_shnum)
|
|
|
790 fatal ("Can't find .data in %s.\n", old_name, 0);
|
|
|
791
|
|
|
792 /* Walk through all section headers, insert the new data2 section right
|
|
|
793 before the new bss section. */
|
|
|
794 for (n = 1, nn = 1; n < old_file_h->e_shnum; n++, nn++)
|
|
|
795 {
|
|
|
796 caddr_t src;
|
|
|
797
|
|
|
798 /* XEmacs change: */
|
|
|
799 if (n < old_bss_index)
|
|
|
800 {
|
|
|
801 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
|
|
|
802 old_file_h->e_shentsize);
|
|
|
803
|
|
|
804 }
|
|
|
805 else if (n == old_bss_index)
|
|
|
806 {
|
|
|
807
|
|
|
808 /* If it is bss section, insert the new data2 section before it. */
|
|
|
809 /* Steal the data section header for this data2 section. */
|
|
|
810 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
|
|
|
811 new_file_h->e_shentsize);
|
|
|
812
|
|
|
813 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
|
|
|
814 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
|
|
|
815 NEW_SECTION_H (nn).sh_size = new_data2_size;
|
|
|
816 /* Use the bss section's alignment. This will assure that the
|
|
|
817 new data2 section always be placed in the same spot as the old
|
|
|
818 bss section by any other application. */
|
|
|
819 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
|
|
|
820
|
|
|
821 /* Now copy over what we have in the memory now. */
|
|
|
822 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
|
|
|
823 (caddr_t) OLD_SECTION_H (n).sh_addr,
|
|
|
824 new_data2_size);
|
|
|
825 nn++;
|
|
|
826 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
|
|
|
827 old_file_h->e_shentsize);
|
|
|
828
|
|
|
829 /* The new bss section's size is zero, and its file offset and virtual
|
|
|
830 address should be off by NEW_OFFSETS_SHIFT. */
|
|
|
831 NEW_SECTION_H (nn).sh_offset += new_offsets_shift;
|
|
|
832 NEW_SECTION_H (nn).sh_addr = new_bss_addr;
|
|
|
833 /* Let the new bss section address alignment be the same as the
|
|
|
834 section address alignment followed the old bss section, so
|
|
|
835 this section will be placed in exactly the same place. */
|
|
|
836 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
|
|
|
837 NEW_SECTION_H (nn).sh_size = 0;
|
|
|
838 }
|
|
|
839 else /* n > old_bss_index */
|
|
|
840 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
|
|
|
841 old_file_h->e_shentsize);
|
|
|
842
|
|
|
843 /* Any section that was original placed AFTER the bss
|
|
|
844 section must now be adjusted by NEW_OFFSETS_SHIFT. */
|
|
|
845
|
|
|
846 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
|
|
|
847 NEW_SECTION_H (nn).sh_offset += new_offsets_shift;
|
|
|
848
|
|
|
849 /* If any section hdr refers to the section after the new .data
|
|
|
850 section, make it refer to next one because we have inserted
|
|
|
851 a new section in between. */
|
|
|
852
|
|
|
853 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
|
|
|
854 /* For symbol tables, info is a symbol table index,
|
|
|
855 so don't change it. */
|
|
|
856 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
|
|
|
857 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
|
|
|
858 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
|
|
|
859
|
|
|
860 /* Now, start to copy the content of sections. */
|
|
|
861 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
|
|
|
862 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
|
|
|
863 continue;
|
|
|
864
|
|
|
865 /* Write out the sections. .data and .data1 (and data2, called
|
|
|
866 ".data" in the strings table) get copied from the current process
|
|
|
867 instead of the old file. */
|
|
|
868 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
|
|
|
869 || !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data1")
|
|
|
870 || !strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".got"))
|
|
|
871 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
|
|
|
872 else
|
|
|
873 src = old_base + OLD_SECTION_H (n).sh_offset;
|
|
|
874
|
|
|
875 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
|
|
|
876 NEW_SECTION_H (nn).sh_size);
|
|
|
877
|
|
|
878 /* Adjust the HDRR offsets in .mdebug and copy the
|
|
|
879 line data if it's in its usual 'hole' in the object.
|
|
|
880 Makes the new file debuggable with dbx.
|
|
|
881 patches up two problems: the absolute file offsets
|
|
|
882 in the HDRR record of .mdebug (see /usr/include/syms.h), and
|
|
|
883 the ld bug that gets the line table in a hole in the
|
|
|
884 elf file rather than in the .mdebug section proper.
|
|
|
885 David Anderson. davea@sgi.com Jan 16,1994. */
|
|
|
886 if (n == old_mdebug_index)
|
|
|
887 {
|
|
|
888 #define MDEBUGADJUST(__ct,__fileaddr) \
|
|
|
889 if (n_phdrr->__ct > 0) \
|
|
|
890 { \
|
|
|
891 n_phdrr->__fileaddr += movement; \
|
|
|
892 }
|
|
|
893
|
|
|
894 HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset);
|
|
|
895 HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset);
|
|
|
896 unsigned movement = new_offsets_shift;
|
|
|
897
|
|
|
898 MDEBUGADJUST (idnMax, cbDnOffset);
|
|
|
899 MDEBUGADJUST (ipdMax, cbPdOffset);
|
|
|
900 MDEBUGADJUST (isymMax, cbSymOffset);
|
|
|
901 MDEBUGADJUST (ioptMax, cbOptOffset);
|
|
|
902 MDEBUGADJUST (iauxMax, cbAuxOffset);
|
|
|
903 MDEBUGADJUST (issMax, cbSsOffset);
|
|
|
904 MDEBUGADJUST (issExtMax, cbSsExtOffset);
|
|
|
905 MDEBUGADJUST (ifdMax, cbFdOffset);
|
|
|
906 MDEBUGADJUST (crfd, cbRfdOffset);
|
|
|
907 MDEBUGADJUST (iextMax, cbExtOffset);
|
|
|
908 /* The Line Section, being possible off in a hole of the object,
|
|
|
909 requires special handling. */
|
|
|
910 if (n_phdrr->cbLine > 0)
|
|
|
911 {
|
|
|
912 if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset
|
|
|
913 + OLD_SECTION_H (n).sh_size))
|
|
|
914 {
|
|
|
915 /* line data is in a hole in elf. do special copy and adjust
|
|
|
916 for this ld mistake.
|
|
|
917 */
|
|
|
918 n_phdrr->cbLineOffset += movement;
|
|
|
919
|
|
|
920 memcpy (n_phdrr->cbLineOffset + new_base,
|
|
|
921 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
|
|
|
922 }
|
|
|
923 else
|
|
|
924 {
|
|
|
925 /* somehow line data is in .mdebug as it is supposed to be. */
|
|
|
926 MDEBUGADJUST (cbLine, cbLineOffset);
|
|
|
927 }
|
|
|
928 }
|
|
|
929 }
|
|
|
930
|
|
|
931 /* If it is the symbol table, its st_shndx field needs to be patched. */
|
|
|
932 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
|
|
|
933 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
|
|
|
934 {
|
|
|
935 Elf32_Shdr *spt = &NEW_SECTION_H (nn);
|
|
|
936 unsigned int num = spt->sh_size / spt->sh_entsize;
|
|
|
937 Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H (nn).sh_offset
|
|
|
938 + new_base);
|
|
|
939 for (; num--; sym++)
|
|
|
940 {
|
|
|
941 if (sym->st_shndx == SHN_UNDEF
|
|
|
942 || sym->st_shndx == SHN_ABS
|
|
|
943 || sym->st_shndx == SHN_COMMON)
|
|
|
944 continue;
|
|
|
945
|
|
|
946 PATCH_INDEX (sym->st_shndx);
|
|
|
947 }
|
|
|
948 }
|
|
|
949 }
|
|
|
950
|
|
|
951 /* Close the files and make the new file executable. */
|
|
|
952
|
|
|
953 if (close (old_file))
|
|
|
954 fatal ("Can't close (%s): errno %d\n", old_name, errno);
|
|
|
955
|
|
|
956 if (close (new_file))
|
|
|
957 fatal ("Can't close (%s): errno %d\n", new_name, errno);
|
|
|
958
|
|
|
959 if (stat (new_name, &stat_buf) == -1)
|
|
|
960 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
|
|
|
961
|
|
|
962 n = umask (777);
|
|
|
963 umask (n);
|
|
|
964 stat_buf.st_mode |= 0111 & ~n;
|
|
|
965 if (chmod (new_name, stat_buf.st_mode) == -1)
|
|
|
966 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
|
|
|
967 }
|
