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1 /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000
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2 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2, or (at your option)
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9 any later version.
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10
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11 GNU Emacs is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GNU Emacs; 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 In other words, you are welcome to use, share and improve this program.
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22 You are forbidden to forbid anyone else to use, share and improve
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23 what you give them. Help stamp out software-hoarding! */
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24
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25 /* 2000-10-31: Martin Buchholz
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26
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27 I noticed that xemacs on Irix 6.5 could not write to stderr, e.g.
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28 (external-debugging-output "\n")
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29 would produce NO output.
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30 temacs worked fine, so this was clearly a dumping problem.
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31
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32 So I copied over the latest available unexelf.c from FSF Emacs,
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33 and installed it as unexelfsgi.c in XEmacs.
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34 In addition, I converted it to "Clean C", resulting in this file.
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35 */
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36
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37 /*
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38 * unexec.c - Convert a running program into an a.out file.
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39 *
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40 * Author: Spencer W. Thomas
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41 * Computer Science Dept.
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42 * University of Utah
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43 * Date: Tue Mar 2 1982
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44 * Modified heavily since then.
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45 *
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46 * Synopsis:
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444
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47 * unexec (new_name, old_name, data_start, bss_start, entry_address)
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48 * char *new_name, *old_name;
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428
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49 * unsigned data_start, bss_start, entry_address;
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50 *
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51 * Takes a snapshot of the program and makes an a.out format file in the
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52 * file named by the string argument new_name.
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444
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53 * If old_name is non-NULL, the symbol table will be taken from the given file.
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54 * On some machines, an existing old_name file is required.
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428
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55 *
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56 * The boundaries within the a.out file may be adjusted with the data_start
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57 * and bss_start arguments. Either or both may be given as 0 for defaults.
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58 *
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59 * Data_start gives the boundary between the text segment and the data
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60 * segment of the program. The text segment can contain shared, read-only
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61 * program code and literal data, while the data segment is always unshared
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62 * and unprotected. Data_start gives the lowest unprotected address.
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63 * The value you specify may be rounded down to a suitable boundary
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64 * as required by the machine you are using.
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65 *
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66 * Bss_start indicates how much of the data segment is to be saved in the
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67 * a.out file and restored when the program is executed. It gives the lowest
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68 * unsaved address, and is rounded up to a page boundary. The default when 0
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69 * is given assumes that the entire data segment is to be stored, including
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70 * the previous data and bss as well as any additional storage allocated with
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71 * break (2).
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72 *
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73 * The new file is set up to start at entry_address.
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74 *
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75 */
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76
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77 /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co.
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78 * ELF support added.
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79 *
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80 * Basic theory: the data space of the running process needs to be
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81 * dumped to the output file. Normally we would just enlarge the size
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82 * of .data, scooting everything down. But we can't do that in ELF,
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83 * because there is often something between the .data space and the
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84 * .bss space.
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85 *
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86 * In the temacs dump below, notice that the Global Offset Table
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87 * (.got) and the Dynamic link data (.dynamic) come between .data1 and
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88 * .bss. It does not work to overlap .data with these fields.
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89 *
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90 * The solution is to create a new .data segment. This segment is
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91 * filled with data from the current process. Since the contents of
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92 * various sections refer to sections by index, the new .data segment
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93 * is made the last in the table to avoid changing any existing index.
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94
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95 * This is an example of how the section headers are changed. "Addr"
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96 * is a process virtual address. "Offset" is a file offset.
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97
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98 raid:/nfs/raid/src/dist-18.56/src> dump -h temacs
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99
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100 temacs:
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101
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102 **** SECTION HEADER TABLE ****
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103 [No] Type Flags Addr Offset Size Name
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104 Link Info Adralgn Entsize
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105
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106 [1] 1 2 0x80480d4 0xd4 0x13 .interp
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107 0 0 0x1 0
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108
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109 [2] 5 2 0x80480e8 0xe8 0x388 .hash
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110 3 0 0x4 0x4
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428
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111
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112 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
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113 4 1 0x4 0x10
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428
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114
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115 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
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116 0 0 0x1 0
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117
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118 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
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119 3 7 0x4 0x8
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428
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120
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121 [6] 1 6 0x8049348 0x1348 0x3 .init
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122 0 0 0x4 0
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123
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124 [7] 1 6 0x804934c 0x134c 0x680 .plt
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125 0 0 0x4 0x4
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428
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126
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127 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
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128 0 0 0x4 0
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428
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129
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130 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
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131 0 0 0x4 0
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428
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132
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133 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
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134 0 0 0x4 0
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135
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136 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
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137 0 0 0x4 0
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428
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138
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139 [12] 1 3 0x8088330 0x3f330 0x20afc .data
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140 0 0 0x4 0
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428
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141
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142 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
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143 0 0 0x4 0
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144
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145 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
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146 0 0 0x4 0x4
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428
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147
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148 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
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149 4 0 0x4 0x8
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428
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150
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151 [16] 8 3 0x80a98f4 0x608f4 0x449c .bss
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152 0 0 0x4 0
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428
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153
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154 [17] 2 0 0 0x608f4 0x9b90 .symtab
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155 18 371 0x4 0x10
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428
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156
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157 [18] 3 0 0 0x6a484 0x8526 .strtab
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158 0 0 0x1 0
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428
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159
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160 [19] 3 0 0 0x729aa 0x93 .shstrtab
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161 0 0 0x1 0
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162
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163 [20] 1 0 0 0x72a3d 0x68b7 .comment
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164 0 0 0x1 0
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428
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165
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166 raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs
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167
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168 xemacs:
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169
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170 **** SECTION HEADER TABLE ****
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171 [No] Type Flags Addr Offset Size Name
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172 Link Info Adralgn Entsize
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173
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174 [1] 1 2 0x80480d4 0xd4 0x13 .interp
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444
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175 0 0 0x1 0
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428
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176
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177 [2] 5 2 0x80480e8 0xe8 0x388 .hash
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178 3 0 0x4 0x4
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428
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179
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180 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
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444
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181 4 1 0x4 0x10
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428
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182
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183 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
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444
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184 0 0 0x1 0
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428
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185
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186 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
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444
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187 3 7 0x4 0x8
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428
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188
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189 [6] 1 6 0x8049348 0x1348 0x3 .init
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190 0 0 0x4 0
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428
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191
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192 [7] 1 6 0x804934c 0x134c 0x680 .plt
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444
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193 0 0 0x4 0x4
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428
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194
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195 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
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196 0 0 0x4 0
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428
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197
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198 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
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444
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199 0 0 0x4 0
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428
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200
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201 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
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202 0 0 0x4 0
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428
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203
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204 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
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205 0 0 0x4 0
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428
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206
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207 [12] 1 3 0x8088330 0x3f330 0x20afc .data
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208 0 0 0x4 0
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428
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209
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210 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
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211 0 0 0x4 0
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428
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212
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213 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
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214 0 0 0x4 0x4
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428
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215
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216 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
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217 4 0 0x4 0x8
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428
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218
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219 [16] 8 3 0x80c6800 0x7d800 0 .bss
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220 0 0 0x4 0
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428
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221
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222 [17] 2 0 0 0x7d800 0x9b90 .symtab
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444
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223 18 371 0x4 0x10
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428
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224
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225 [18] 3 0 0 0x87390 0x8526 .strtab
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444
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226 0 0 0x1 0
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428
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227
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228 [19] 3 0 0 0x8f8b6 0x93 .shstrtab
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444
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229 0 0 0x1 0
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428
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230
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231 [20] 1 0 0 0x8f949 0x68b7 .comment
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444
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232 0 0 0x1 0
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428
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233
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234 [21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
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444
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235 0 0 0x4 0
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428
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236
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237 * This is an example of how the file header is changed. "Shoff" is
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238 * the section header offset within the file. Since that table is
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239 * after the new .data section, it is moved. "Shnum" is the number of
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240 * sections, which we increment.
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241 *
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242 * "Phoff" is the file offset to the program header. "Phentsize" and
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243 * "Shentsz" are the program and section header entries sizes respectively.
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244 * These can be larger than the apparent struct sizes.
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245
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|
246 raid:/nfs/raid/src/dist-18.56/src> dump -f temacs
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247
|
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248 temacs:
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249
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250 **** ELF HEADER ****
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251 Class Data Type Machine Version
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252 Entry Phoff Shoff Flags Ehsize
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253 Phentsize Phnum Shentsz Shnum Shstrndx
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254
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255 1 1 2 3 1
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256 0x80499cc 0x34 0x792f4 0 0x34
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257 0x20 5 0x28 21 19
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258
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259 raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs
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260
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261 xemacs:
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262
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263 **** ELF HEADER ****
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264 Class Data Type Machine Version
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|
265 Entry Phoff Shoff Flags Ehsize
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266 Phentsize Phnum Shentsz Shnum Shstrndx
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267
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268 1 1 2 3 1
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269 0x80499cc 0x34 0x96200 0 0x34
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270 0x20 5 0x28 22 19
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271
|
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272 * These are the program headers. "Offset" is the file offset to the
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273 * segment. "Vaddr" is the memory load address. "Filesz" is the
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274 * segment size as it appears in the file, and "Memsz" is the size in
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275 * memory. Below, the third segment is the code and the fourth is the
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276 * data: the difference between Filesz and Memsz is .bss
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277
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278 raid:/nfs/raid/src/dist-18.56/src> dump -o temacs
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279
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|
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280 temacs:
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281 ***** PROGRAM EXECUTION HEADER *****
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282 Type Offset Vaddr Paddr
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283 Filesz Memsz Flags Align
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|
284
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444
|
285 6 0x34 0x8048034 0
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286 0xa0 0xa0 5 0
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428
|
287
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|
444
|
288 3 0xd4 0 0
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|
|
289 0x13 0 4 0
|
|
428
|
290
|
|
444
|
291 1 0x34 0x8048034 0
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|
|
292 0x3f2f9 0x3f2f9 5 0x1000
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|
428
|
293
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444
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294 1 0x3f330 0x8088330 0
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|
|
295 0x215c4 0x25a60 7 0x1000
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|
428
|
296
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|
444
|
297 2 0x60874 0x80a9874 0
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|
|
298 0x80 0 7 0
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|
428
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299
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|
|
300 raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs
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|
|
301
|
|
|
302 xemacs:
|
|
|
303 ***** PROGRAM EXECUTION HEADER *****
|
|
|
304 Type Offset Vaddr Paddr
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|
|
305 Filesz Memsz Flags Align
|
|
|
306
|
|
444
|
307 6 0x34 0x8048034 0
|
|
|
308 0xa0 0xa0 5 0
|
|
428
|
309
|
|
444
|
310 3 0xd4 0 0
|
|
|
311 0x13 0 4 0
|
|
428
|
312
|
|
444
|
313 1 0x34 0x8048034 0
|
|
|
314 0x3f2f9 0x3f2f9 5 0x1000
|
|
428
|
315
|
|
444
|
316 1 0x3f330 0x8088330 0
|
|
|
317 0x3e4d0 0x3e4d0 7 0x1000
|
|
428
|
318
|
|
444
|
319 2 0x60874 0x80a9874 0
|
|
|
320 0x80 0 7 0
|
|
428
|
321
|
|
|
322
|
|
|
323 */
|
|
|
324
|
|
444
|
325 /* Modified by wtien@urbana.mcd.mot.com of Motorola Inc.
|
|
|
326 *
|
|
428
|
327 * The above mechanism does not work if the unexeced ELF file is being
|
|
444
|
328 * re-layout by other applications (such as `strip'). All the applications
|
|
428
|
329 * that re-layout the internal of ELF will layout all sections in ascending
|
|
444
|
330 * order of their file offsets. After the re-layout, the data2 section will
|
|
|
331 * still be the LAST section in the section header vector, but its file offset
|
|
428
|
332 * is now being pushed far away down, and causes part of it not to be mapped
|
|
444
|
333 * in (ie. not covered by the load segment entry in PHDR vector), therefore
|
|
428
|
334 * causes the new binary to fail.
|
|
|
335 *
|
|
|
336 * The solution is to modify the unexec algorithm to insert the new data2
|
|
|
337 * section header right before the new bss section header, so their file
|
|
444
|
338 * offsets will be in the ascending order. Since some of the section's (all
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|
|
339 * sections AFTER the bss section) indexes are now changed, we also need to
|
|
|
340 * modify some fields to make them point to the right sections. This is done
|
|
428
|
341 * by macro PATCH_INDEX. All the fields that need to be patched are:
|
|
444
|
342 *
|
|
428
|
343 * 1. ELF header e_shstrndx field.
|
|
|
344 * 2. section header sh_link and sh_info field.
|
|
|
345 * 3. symbol table entry st_shndx field.
|
|
|
346 *
|
|
|
347 * The above example now should look like:
|
|
|
348
|
|
|
349 **** SECTION HEADER TABLE ****
|
|
|
350 [No] Type Flags Addr Offset Size Name
|
|
|
351 Link Info Adralgn Entsize
|
|
|
352
|
|
|
353 [1] 1 2 0x80480d4 0xd4 0x13 .interp
|
|
444
|
354 0 0 0x1 0
|
|
428
|
355
|
|
|
356 [2] 5 2 0x80480e8 0xe8 0x388 .hash
|
|
444
|
357 3 0 0x4 0x4
|
|
428
|
358
|
|
|
359 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym
|
|
444
|
360 4 1 0x4 0x10
|
|
428
|
361
|
|
|
362 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr
|
|
444
|
363 0 0 0x1 0
|
|
428
|
364
|
|
|
365 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt
|
|
444
|
366 3 7 0x4 0x8
|
|
428
|
367
|
|
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368 [6] 1 6 0x8049348 0x1348 0x3 .init
|
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444
|
369 0 0 0x4 0
|
|
428
|
370
|
|
|
371 [7] 1 6 0x804934c 0x134c 0x680 .plt
|
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444
|
372 0 0 0x4 0x4
|
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428
|
373
|
|
|
374 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text
|
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444
|
375 0 0 0x4 0
|
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428
|
376
|
|
|
377 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini
|
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444
|
378 0 0 0x4 0
|
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428
|
379
|
|
|
380 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata
|
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444
|
381 0 0 0x4 0
|
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428
|
382
|
|
|
383 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1
|
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444
|
384 0 0 0x4 0
|
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428
|
385
|
|
|
386 [12] 1 3 0x8088330 0x3f330 0x20afc .data
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444
|
387 0 0 0x4 0
|
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428
|
388
|
|
|
389 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1
|
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444
|
390 0 0 0x4 0
|
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428
|
391
|
|
|
392 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got
|
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444
|
393 0 0 0x4 0x4
|
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428
|
394
|
|
|
395 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic
|
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444
|
396 4 0 0x4 0x8
|
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428
|
397
|
|
|
398 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data
|
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444
|
399 0 0 0x4 0
|
|
428
|
400
|
|
|
401 [17] 8 3 0x80c6800 0x7d800 0 .bss
|
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444
|
402 0 0 0x4 0
|
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428
|
403
|
|
|
404 [18] 2 0 0 0x7d800 0x9b90 .symtab
|
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444
|
405 19 371 0x4 0x10
|
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428
|
406
|
|
|
407 [19] 3 0 0 0x87390 0x8526 .strtab
|
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444
|
408 0 0 0x1 0
|
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428
|
409
|
|
|
410 [20] 3 0 0 0x8f8b6 0x93 .shstrtab
|
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444
|
411 0 0 0x1 0
|
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428
|
412
|
|
|
413 [21] 1 0 0 0x8f949 0x68b7 .comment
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444
|
414 0 0 0x1 0
|
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428
|
415
|
|
|
416 */
|
|
444
|
417
|
|
|
418 #ifndef emacs
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|
419 #define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1)
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420 #include <string.h>
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421 #else
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422 #include <config.h>
|
|
|
423 extern void fatal (const char *, ...);
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|
|
424 #endif
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428
|
425
|
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|
426 #include <sys/types.h>
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|
427 #include <stdio.h>
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|
428 #include <sys/stat.h>
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|
429 #include <memory.h>
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430 #include <errno.h>
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|
431 #include <unistd.h>
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|
432 #include <fcntl.h>
|
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444
|
433 #if !defined (__NetBSD__) && !defined (__OpenBSD__)
|
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428
|
434 #include <elf.h>
|
|
444
|
435 #endif
|
|
428
|
436 #include <sys/mman.h>
|
|
444
|
437 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
|
|
|
438 #include <sys/elf_mips.h>
|
|
|
439 #include <sym.h>
|
|
|
440 #endif /* __sony_news && _SYSTYPE_SYSV */
|
|
|
441 #if __sgi
|
|
|
442 #include <syms.h> /* for HDRR declaration */
|
|
|
443 #endif /* __sgi */
|
|
428
|
444
|
|
444
|
445 #if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__)
|
|
|
446 /* Declare COFF debugging symbol table. This used to be in
|
|
|
447 /usr/include/sym.h, but this file is no longer included in Red Hat
|
|
|
448 5.0 and presumably in any other glibc 2.x based distribution. */
|
|
|
449 typedef struct {
|
|
|
450 short magic;
|
|
|
451 short vstamp;
|
|
|
452 int ilineMax;
|
|
|
453 int idnMax;
|
|
|
454 int ipdMax;
|
|
|
455 int isymMax;
|
|
|
456 int ioptMax;
|
|
|
457 int iauxMax;
|
|
|
458 int issMax;
|
|
|
459 int issExtMax;
|
|
|
460 int ifdMax;
|
|
|
461 int crfd;
|
|
|
462 int iextMax;
|
|
|
463 long cbLine;
|
|
|
464 long cbLineOffset;
|
|
|
465 long cbDnOffset;
|
|
|
466 long cbPdOffset;
|
|
|
467 long cbSymOffset;
|
|
|
468 long cbOptOffset;
|
|
|
469 long cbAuxOffset;
|
|
|
470 long cbSsOffset;
|
|
|
471 long cbSsExtOffset;
|
|
|
472 long cbFdOffset;
|
|
|
473 long cbRfdOffset;
|
|
|
474 long cbExtOffset;
|
|
|
475 } HDRR, *pHDRR;
|
|
|
476 #define cbHDRR sizeof(HDRR)
|
|
|
477 #define hdrNil ((pHDRR)0)
|
|
428
|
478 #endif
|
|
|
479
|
|
444
|
480 #ifdef __NetBSD__
|
|
|
481 /*
|
|
|
482 * NetBSD does not have normal-looking user-land ELF support.
|
|
|
483 */
|
|
|
484 # if defined __alpha__ || defined __sparc_v9__
|
|
|
485 # define ELFSIZE 64
|
|
|
486 # else
|
|
|
487 # define ELFSIZE 32
|
|
|
488 # endif
|
|
|
489 # include <sys/exec_elf.h>
|
|
|
490
|
|
|
491 # ifndef PT_LOAD
|
|
|
492 # define PT_LOAD Elf_pt_load
|
|
|
493 # if 0 /* was in pkgsrc patches for 20.7 */
|
|
|
494 # define SHT_PROGBITS Elf_sht_progbits
|
|
|
495 # endif
|
|
|
496 # define SHT_SYMTAB Elf_sht_symtab
|
|
|
497 # define SHT_DYNSYM Elf_sht_dynsym
|
|
|
498 # define SHT_NULL Elf_sht_null
|
|
|
499 # define SHT_NOBITS Elf_sht_nobits
|
|
|
500 # define SHT_REL Elf_sht_rel
|
|
|
501 # define SHT_RELA Elf_sht_rela
|
|
|
502
|
|
|
503 # define SHN_UNDEF Elf_eshn_undefined
|
|
|
504 # define SHN_ABS Elf_eshn_absolute
|
|
|
505 # define SHN_COMMON Elf_eshn_common
|
|
|
506 # endif /* !PT_LOAD */
|
|
|
507
|
|
|
508 # ifdef __alpha__
|
|
|
509 # include <sys/exec_ecoff.h>
|
|
|
510 # define HDRR struct ecoff_symhdr
|
|
|
511 # define pHDRR HDRR *
|
|
|
512 # endif /* __alpha__ */
|
|
|
513
|
|
|
514 #ifdef __mips__ /* was in pkgsrc patches for 20.7 */
|
|
|
515 # define SHT_MIPS_DEBUG DT_MIPS_FLAGS
|
|
|
516 # define HDRR struct Elf_Shdr
|
|
|
517 #endif /* __mips__ */
|
|
|
518 #endif /* __NetBSD__ */
|
|
|
519
|
|
|
520 #ifdef __OpenBSD__
|
|
|
521 # include <sys/exec_elf.h>
|
|
|
522 #endif
|
|
|
523
|
|
|
524 #if __GNU_LIBRARY__ - 0 >= 6
|
|
|
525 # include <link.h> /* get ElfW etc */
|
|
|
526 #endif
|
|
|
527
|
|
|
528 #ifndef ElfW
|
|
|
529 # ifdef __STDC__
|
|
|
530 # define ElfBitsW(bits, type) Elf##bits##_##type
|
|
|
531 # else
|
|
|
532 # define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type
|
|
|
533 # endif
|
|
|
534 # ifdef _LP64
|
|
|
535 # define ELFSIZE 64
|
|
|
536 # else
|
|
|
537 # define ELFSIZE 32
|
|
|
538 # endif
|
|
|
539 /* This macro expands `bits' before invoking ElfBitsW. */
|
|
|
540 # define ElfExpandBitsW(bits, type) ElfBitsW (bits, type)
|
|
|
541 # define ElfW(type) ElfExpandBitsW (ELFSIZE, type)
|
|
|
542 #endif
|
|
|
543
|
|
|
544 #ifndef ELF_BSS_SECTION_NAME
|
|
|
545 #define ELF_BSS_SECTION_NAME ".bss"
|
|
|
546 #endif
|
|
428
|
547
|
|
|
548 /* Get the address of a particular section or program header entry,
|
|
|
549 * accounting for the size of the entries.
|
|
|
550 */
|
|
444
|
551 /*
|
|
|
552 On PPC Reference Platform running Solaris 2.5.1
|
|
|
553 the plt section is also of type NOBI like the bss section.
|
|
|
554 (not really stored) and therefore sections after the bss
|
|
|
555 section start at the plt offset. The plt section is always
|
|
|
556 the one just before the bss section.
|
|
|
557 Thus, we modify the test from
|
|
|
558 if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset)
|
|
|
559 to
|
|
|
560 if (NEW_SECTION_H (nn).sh_offset >=
|
|
|
561 OLD_SECTION_H (old_bss_index-1).sh_offset)
|
|
|
562 This is just a hack. We should put the new data section
|
|
|
563 before the .plt section.
|
|
|
564 And we should not have this routine at all but use
|
|
|
565 the libelf library to read the old file and create the new
|
|
|
566 file.
|
|
|
567 The changed code is minimal and depends on prep set in m/prep.h
|
|
|
568 Erik Deumens
|
|
|
569 Quantum Theory Project
|
|
|
570 University of Florida
|
|
|
571 deumens@qtp.ufl.edu
|
|
|
572 Apr 23, 1996
|
|
|
573 */
|
|
428
|
574
|
|
|
575 #define OLD_SECTION_H(n) \
|
|
444
|
576 (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n)))
|
|
428
|
577 #define NEW_SECTION_H(n) \
|
|
444
|
578 (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n)))
|
|
428
|
579 #define OLD_PROGRAM_H(n) \
|
|
444
|
580 (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n)))
|
|
428
|
581 #define NEW_PROGRAM_H(n) \
|
|
444
|
582 (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n)))
|
|
428
|
583
|
|
|
584 #define PATCH_INDEX(n) \
|
|
|
585 do { \
|
|
444
|
586 if ((int) (n) >= old_bss_index) \
|
|
428
|
587 (n)++; } while (0)
|
|
|
588 typedef unsigned char byte;
|
|
|
589
|
|
|
590 /* Round X up to a multiple of Y. */
|
|
|
591
|
|
444
|
592 static ElfW(Addr)
|
|
|
593 round_up (ElfW(Addr) x, ElfW(Addr) y)
|
|
428
|
594 {
|
|
|
595 int rem = x % y;
|
|
|
596 if (rem == 0)
|
|
|
597 return x;
|
|
|
598 return x - rem + y;
|
|
|
599 }
|
|
|
600
|
|
|
601 /* Return the index of the section named NAME.
|
|
|
602 SECTION_NAMES, FILE_NAME and FILE_H give information
|
|
|
603 about the file we are looking in.
|
|
|
604
|
|
|
605 If we don't find the section NAME, that is a fatal error
|
|
|
606 if NOERROR is 0; we return -1 if NOERROR is nonzero. */
|
|
|
607
|
|
|
608 static int
|
|
|
609 find_section (char *name,
|
|
|
610 char *section_names,
|
|
|
611 char *file_name,
|
|
444
|
612 ElfW(Ehdr) *old_file_h,
|
|
|
613 ElfW(Shdr) *old_section_h,
|
|
428
|
614 int noerror)
|
|
|
615 {
|
|
|
616 int idx;
|
|
|
617
|
|
|
618 for (idx = 1; idx < old_file_h->e_shnum; idx++)
|
|
|
619 {
|
|
|
620 #ifdef DEBUG
|
|
|
621 fprintf (stderr, "Looking for %s - found %s\n", name,
|
|
|
622 section_names + OLD_SECTION_H (idx).sh_name);
|
|
|
623 #endif
|
|
|
624 if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name,
|
|
|
625 name))
|
|
|
626 break;
|
|
|
627 }
|
|
|
628 if (idx == old_file_h->e_shnum)
|
|
|
629 {
|
|
|
630 if (noerror)
|
|
|
631 return -1;
|
|
|
632 else
|
|
444
|
633 fatal ("Can't find %s in %s.\n", name, file_name);
|
|
428
|
634 }
|
|
|
635
|
|
|
636 return idx;
|
|
|
637 }
|
|
|
638
|
|
|
639 /* ****************************************************************
|
|
|
640 * unexec
|
|
|
641 *
|
|
|
642 * driving logic.
|
|
|
643 *
|
|
|
644 * In ELF, this works by replacing the old .bss section with a new
|
|
|
645 * .data section, and inserting an empty .bss immediately afterwards.
|
|
|
646 *
|
|
|
647 */
|
|
444
|
648 void
|
|
428
|
649 unexec (char *new_name,
|
|
|
650 char *old_name,
|
|
|
651 uintptr_t data_start,
|
|
|
652 uintptr_t bss_start,
|
|
|
653 uintptr_t entry_address)
|
|
|
654 {
|
|
|
655 int new_file, old_file, new_file_size;
|
|
|
656
|
|
444
|
657 /* Pointers to the base of the image of the two files. */
|
|
428
|
658 caddr_t old_base, new_base;
|
|
|
659
|
|
|
660 /* Pointers to the file, program and section headers for the old and new
|
|
444
|
661 * files.
|
|
|
662 */
|
|
|
663 ElfW(Ehdr) *old_file_h, *new_file_h;
|
|
|
664 ElfW(Phdr) *old_program_h, *new_program_h;
|
|
|
665 ElfW(Shdr) *old_section_h, *new_section_h;
|
|
428
|
666
|
|
444
|
667 /* Point to the section name table in the old file */
|
|
428
|
668 char *old_section_names;
|
|
|
669
|
|
444
|
670 ElfW(Addr) old_bss_addr, new_bss_addr;
|
|
|
671 ElfW(Word) old_bss_size, new_data2_size;
|
|
|
672 ElfW(Off) new_data2_offset;
|
|
|
673 ElfW(Addr) new_data2_addr;
|
|
428
|
674
|
|
444
|
675 int n, nn;
|
|
|
676 int old_bss_index, old_sbss_index;
|
|
|
677 int old_data_index, new_data2_index;
|
|
|
678 int old_mdebug_index;
|
|
428
|
679 struct stat stat_buf;
|
|
|
680
|
|
444
|
681 /* Open the old file & map it into the address space. */
|
|
428
|
682
|
|
|
683 old_file = open (old_name, O_RDONLY);
|
|
|
684
|
|
|
685 if (old_file < 0)
|
|
|
686 fatal ("Can't open %s for reading: errno %d\n", old_name, errno);
|
|
|
687
|
|
|
688 if (fstat (old_file, &stat_buf) == -1)
|
|
444
|
689 fatal ("Can't fstat (%s): errno %d\n", old_name, errno);
|
|
428
|
690
|
|
444
|
691 old_base = (caddr_t) mmap ((caddr_t) 0, stat_buf.st_size,
|
|
|
692 PROT_READ, MAP_SHARED, old_file, 0);
|
|
428
|
693
|
|
|
694 if (old_base == (caddr_t) -1)
|
|
444
|
695 fatal ("Can't mmap (%s): errno %d\n", old_name, errno);
|
|
428
|
696
|
|
|
697 #ifdef DEBUG
|
|
444
|
698 fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size,
|
|
428
|
699 old_base);
|
|
|
700 #endif
|
|
|
701
|
|
444
|
702 /* Get pointers to headers & section names */
|
|
428
|
703
|
|
444
|
704 old_file_h = (ElfW(Ehdr) *) old_base;
|
|
|
705 old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff);
|
|
|
706 old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff);
|
|
|
707 old_section_names = (char *) old_base
|
|
|
708 + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset;
|
|
428
|
709
|
|
|
710 /* Find the mdebug section, if any. */
|
|
|
711
|
|
|
712 old_mdebug_index = find_section (".mdebug", old_section_names,
|
|
|
713 old_name, old_file_h, old_section_h, 1);
|
|
|
714
|
|
444
|
715 /* Find the old .bss section. Figure out parameters of the new
|
|
|
716 * data2 and bss sections.
|
|
|
717 */
|
|
|
718
|
|
|
719 old_bss_index = find_section (".bss", old_section_names,
|
|
|
720 old_name, old_file_h, old_section_h, 0);
|
|
428
|
721
|
|
|
722 old_sbss_index = find_section (".sbss", old_section_names,
|
|
|
723 old_name, old_file_h, old_section_h, 1);
|
|
444
|
724 if (old_sbss_index != -1)
|
|
|
725 if (OLD_SECTION_H (old_sbss_index).sh_type == SHT_PROGBITS)
|
|
|
726 old_sbss_index = -1;
|
|
428
|
727
|
|
444
|
728 if (old_sbss_index == -1)
|
|
|
729 {
|
|
|
730 old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr;
|
|
|
731 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size;
|
|
|
732 new_data2_index = old_bss_index;
|
|
|
733 }
|
|
|
734 else
|
|
|
735 {
|
|
|
736 old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr;
|
|
|
737 old_bss_size = OLD_SECTION_H (old_bss_index).sh_size
|
|
|
738 + OLD_SECTION_H (old_sbss_index).sh_size;
|
|
|
739 new_data2_index = old_sbss_index;
|
|
|
740 }
|
|
428
|
741
|
|
|
742 /* Find the old .data section. Figure out parameters of
|
|
|
743 the new data2 and bss sections. */
|
|
|
744
|
|
|
745 old_data_index = find_section (".data", old_section_names,
|
|
|
746 old_name, old_file_h, old_section_h, 0);
|
|
|
747
|
|
444
|
748 #if defined (emacs) || !defined (DEBUG)
|
|
|
749 new_bss_addr = (ElfW(Addr)) sbrk (0);
|
|
428
|
750 #else
|
|
444
|
751 new_bss_addr = old_bss_addr + old_bss_size + 0x1234;
|
|
428
|
752 #endif
|
|
444
|
753 new_data2_addr = old_bss_addr;
|
|
|
754 new_data2_size = new_bss_addr - old_bss_addr;
|
|
428
|
755 new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset +
|
|
|
756 (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr);
|
|
|
757
|
|
|
758 #ifdef DEBUG
|
|
|
759 fprintf (stderr, "old_bss_index %d\n", old_bss_index);
|
|
|
760 fprintf (stderr, "old_bss_addr %x\n", old_bss_addr);
|
|
|
761 fprintf (stderr, "old_bss_size %x\n", old_bss_size);
|
|
|
762 fprintf (stderr, "new_bss_addr %x\n", new_bss_addr);
|
|
|
763 fprintf (stderr, "new_data2_addr %x\n", new_data2_addr);
|
|
|
764 fprintf (stderr, "new_data2_size %x\n", new_data2_size);
|
|
|
765 fprintf (stderr, "new_data2_offset %x\n", new_data2_offset);
|
|
|
766 #endif
|
|
|
767
|
|
|
768 if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size)
|
|
444
|
769 fatal (".bss shrank when undumping???\n", 0, 0);
|
|
428
|
770
|
|
|
771 /* Set the output file to the right size and mmap it. Set
|
|
444
|
772 * pointers to various interesting objects. stat_buf still has
|
|
|
773 * old_file data.
|
|
|
774 */
|
|
428
|
775
|
|
|
776 new_file = open (new_name, O_RDWR | O_CREAT, 0666);
|
|
|
777 if (new_file < 0)
|
|
|
778 fatal ("Can't creat (%s): errno %d\n", new_name, errno);
|
|
|
779
|
|
444
|
780 new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size;
|
|
428
|
781
|
|
|
782 if (ftruncate (new_file, new_file_size))
|
|
|
783 fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
|
|
|
784
|
|
444
|
785 #ifdef UNEXEC_USE_MAP_PRIVATE
|
|
|
786 new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size,
|
|
|
787 PROT_READ | PROT_WRITE,
|
|
|
788 MAP_PRIVATE, new_file, 0);
|
|
|
789 #else
|
|
|
790 new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size,
|
|
|
791 PROT_READ | PROT_WRITE,
|
|
|
792 MAP_SHARED, new_file, 0);
|
|
|
793 #endif
|
|
428
|
794
|
|
|
795 if (new_base == (caddr_t) -1)
|
|
|
796 fatal ("Can't mmap (%s): errno %d\n", new_name, errno);
|
|
|
797
|
|
444
|
798 new_file_h = (ElfW(Ehdr) *) new_base;
|
|
|
799 new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff);
|
|
|
800 new_section_h = (ElfW(Shdr) *)
|
|
|
801 ((byte *) new_base + old_file_h->e_shoff + new_data2_size);
|
|
428
|
802
|
|
|
803 /* Make our new file, program and section headers as copies of the
|
|
444
|
804 * originals.
|
|
|
805 */
|
|
428
|
806
|
|
|
807 memcpy (new_file_h, old_file_h, old_file_h->e_ehsize);
|
|
|
808 memcpy (new_program_h, old_program_h,
|
|
|
809 old_file_h->e_phnum * old_file_h->e_phentsize);
|
|
|
810
|
|
|
811 /* Modify the e_shstrndx if necessary. */
|
|
|
812 PATCH_INDEX (new_file_h->e_shstrndx);
|
|
|
813
|
|
|
814 /* Fix up file header. We'll add one section. Section header is
|
|
444
|
815 * further away now.
|
|
|
816 */
|
|
428
|
817
|
|
444
|
818 new_file_h->e_shoff += new_data2_size;
|
|
428
|
819 new_file_h->e_shnum += 1;
|
|
|
820
|
|
|
821 #ifdef DEBUG
|
|
|
822 fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff);
|
|
|
823 fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum);
|
|
|
824 fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff);
|
|
|
825 fprintf (stderr, "New section count %d\n", new_file_h->e_shnum);
|
|
|
826 #endif
|
|
|
827
|
|
|
828 /* Fix up a new program header. Extend the writable data segment so
|
|
444
|
829 * that the bss area is covered too. Find that segment by looking
|
|
|
830 * for a segment that ends just before the .bss area. Make sure
|
|
|
831 * that no segments are above the new .data2. Put a loop at the end
|
|
|
832 * to adjust the offset and address of any segment that is above
|
|
|
833 * data2, just in case we decide to allow this later.
|
|
|
834 */
|
|
428
|
835
|
|
|
836 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
837 {
|
|
|
838 /* Compute maximum of all requirements for alignment of section. */
|
|
444
|
839 ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align;
|
|
|
840 if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment)
|
|
|
841 alignment = OLD_SECTION_H (old_bss_index).sh_addralign;
|
|
|
842
|
|
|
843 #ifdef __sgi
|
|
|
844 /* According to r02kar@x4u2.desy.de (Karsten Kuenne)
|
|
|
845 and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we
|
|
|
846 always get "Program segment above .bss" when dumping
|
|
|
847 when the executable doesn't have an sbss section. */
|
|
|
848 if (old_sbss_index != -1)
|
|
|
849 #endif /* __sgi */
|
|
|
850 if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz
|
|
|
851 > (old_sbss_index == -1
|
|
|
852 ? old_bss_addr
|
|
|
853 : round_up (old_bss_addr, alignment)))
|
|
|
854 fatal ("Program segment above .bss in %s\n", old_name, 0);
|
|
|
855
|
|
|
856 if (NEW_PROGRAM_H (n).p_type == PT_LOAD
|
|
|
857 && (round_up ((NEW_PROGRAM_H (n)).p_vaddr
|
|
|
858 + (NEW_PROGRAM_H (n)).p_filesz,
|
|
|
859 alignment)
|
|
|
860 == round_up (old_bss_addr, alignment)))
|
|
|
861 break;
|
|
428
|
862 }
|
|
|
863 if (n < 0)
|
|
444
|
864 fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0);
|
|
428
|
865
|
|
444
|
866 /* Make sure that the size includes any padding before the old .bss
|
|
|
867 section. */
|
|
|
868 NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr;
|
|
|
869 NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz;
|
|
428
|
870
|
|
444
|
871 #if 0 /* Maybe allow section after data2 - does this ever happen? */
|
|
428
|
872 for (n = new_file_h->e_phnum - 1; n >= 0; n--)
|
|
|
873 {
|
|
|
874 if (NEW_PROGRAM_H (n).p_vaddr
|
|
|
875 && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr)
|
|
444
|
876 NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size;
|
|
428
|
877
|
|
|
878 if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset)
|
|
444
|
879 NEW_PROGRAM_H (n).p_offset += new_data2_size;
|
|
428
|
880 }
|
|
|
881 #endif
|
|
|
882
|
|
|
883 /* Fix up section headers based on new .data2 section. Any section
|
|
444
|
884 * whose offset or virtual address is after the new .data2 section
|
|
|
885 * gets its value adjusted. .bss size becomes zero and new address
|
|
|
886 * is set. data2 section header gets added by copying the existing
|
|
|
887 * .data header and modifying the offset, address and size.
|
|
|
888 */
|
|
|
889 for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum;
|
|
428
|
890 old_data_index++)
|
|
|
891 if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name,
|
|
|
892 ".data"))
|
|
|
893 break;
|
|
|
894 if (old_data_index == old_file_h->e_shnum)
|
|
444
|
895 fatal ("Can't find .data in %s.\n", old_name, 0);
|
|
428
|
896
|
|
444
|
897 /* Walk through all section headers, insert the new data2 section right
|
|
|
898 before the new bss section. */
|
|
|
899 for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++)
|
|
428
|
900 {
|
|
|
901 caddr_t src;
|
|
444
|
902 /* If it is (s)bss section, insert the new data2 section before it. */
|
|
|
903 /* new_data2_index is the index of either old_sbss or old_bss, that was
|
|
|
904 chosen as a section for new_data2. */
|
|
|
905 if (n == new_data2_index)
|
|
428
|
906 {
|
|
444
|
907 /* Steal the data section header for this data2 section. */
|
|
428
|
908 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index),
|
|
|
909 new_file_h->e_shentsize);
|
|
444
|
910
|
|
428
|
911 NEW_SECTION_H (nn).sh_addr = new_data2_addr;
|
|
|
912 NEW_SECTION_H (nn).sh_offset = new_data2_offset;
|
|
|
913 NEW_SECTION_H (nn).sh_size = new_data2_size;
|
|
|
914 /* Use the bss section's alignment. This will assure that the
|
|
|
915 new data2 section always be placed in the same spot as the old
|
|
444
|
916 bss section by any other application. */
|
|
428
|
917 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign;
|
|
|
918
|
|
444
|
919 /* Now copy over what we have in the memory now. */
|
|
|
920 memcpy (NEW_SECTION_H (nn).sh_offset + new_base,
|
|
|
921 (caddr_t) OLD_SECTION_H (n).sh_addr,
|
|
428
|
922 new_data2_size);
|
|
|
923 nn++;
|
|
444
|
924 }
|
|
|
925
|
|
|
926 memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n),
|
|
|
927 old_file_h->e_shentsize);
|
|
|
928
|
|
|
929 if (n == old_bss_index
|
|
|
930 /* The new bss and sbss section's size is zero, and its file offset
|
|
|
931 and virtual address should be off by NEW_DATA2_SIZE. */
|
|
|
932 || n == old_sbss_index
|
|
|
933 )
|
|
|
934 {
|
|
|
935 /* NN should be `old_s?bss_index + 1' at this point. */
|
|
|
936 NEW_SECTION_H (nn).sh_offset =
|
|
|
937 NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size;
|
|
|
938 NEW_SECTION_H (nn).sh_addr =
|
|
|
939 NEW_SECTION_H (new_data2_index).sh_addr + new_data2_size;
|
|
428
|
940 /* Let the new bss section address alignment be the same as the
|
|
444
|
941 section address alignment followed the old bss section, so
|
|
|
942 this section will be placed in exactly the same place. */
|
|
|
943 NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign;
|
|
428
|
944 NEW_SECTION_H (nn).sh_size = 0;
|
|
|
945 }
|
|
444
|
946 else
|
|
|
947 {
|
|
|
948 /* Any section that was original placed AFTER the bss
|
|
|
949 section should now be off by NEW_DATA2_SIZE. */
|
|
|
950 #ifdef SOLARIS_POWERPC
|
|
|
951 /* On PPC Reference Platform running Solaris 2.5.1
|
|
|
952 the plt section is also of type NOBI like the bss section.
|
|
|
953 (not really stored) and therefore sections after the bss
|
|
|
954 section start at the plt offset. The plt section is always
|
|
|
955 the one just before the bss section.
|
|
|
956 It would be better to put the new data section before
|
|
|
957 the .plt section, or use libelf instead.
|
|
|
958 Erik Deumens, deumens@qtp.ufl.edu. */
|
|
|
959 if (NEW_SECTION_H (nn).sh_offset
|
|
|
960 >= OLD_SECTION_H (old_bss_index-1).sh_offset)
|
|
|
961 NEW_SECTION_H (nn).sh_offset += new_data2_size;
|
|
|
962 #else
|
|
|
963 if (round_up (NEW_SECTION_H (nn).sh_offset,
|
|
|
964 OLD_SECTION_H (old_bss_index).sh_addralign)
|
|
|
965 >= new_data2_offset)
|
|
|
966 NEW_SECTION_H (nn).sh_offset += new_data2_size;
|
|
|
967 #endif
|
|
|
968 /* Any section that was originally placed after the section
|
|
|
969 header table should now be off by the size of one section
|
|
|
970 header table entry. */
|
|
|
971 if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff)
|
|
|
972 NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize;
|
|
|
973 }
|
|
428
|
974
|
|
|
975 /* If any section hdr refers to the section after the new .data
|
|
444
|
976 section, make it refer to next one because we have inserted
|
|
428
|
977 a new section in between. */
|
|
444
|
978
|
|
428
|
979 PATCH_INDEX (NEW_SECTION_H (nn).sh_link);
|
|
|
980 /* For symbol tables, info is a symbol table index,
|
|
|
981 so don't change it. */
|
|
|
982 if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB
|
|
|
983 && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM)
|
|
|
984 PATCH_INDEX (NEW_SECTION_H (nn).sh_info);
|
|
|
985
|
|
444
|
986 if (old_sbss_index != -1)
|
|
|
987 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".sbss"))
|
|
|
988 {
|
|
|
989 NEW_SECTION_H (nn).sh_offset =
|
|
|
990 round_up (NEW_SECTION_H (nn).sh_offset,
|
|
|
991 NEW_SECTION_H (nn).sh_addralign);
|
|
|
992 NEW_SECTION_H (nn).sh_type = SHT_PROGBITS;
|
|
|
993 }
|
|
|
994
|
|
|
995 /* Now, start to copy the content of sections. */
|
|
428
|
996 if (NEW_SECTION_H (nn).sh_type == SHT_NULL
|
|
|
997 || NEW_SECTION_H (nn).sh_type == SHT_NOBITS)
|
|
|
998 continue;
|
|
444
|
999
|
|
|
1000 /* Write out the sections. .data and .data1 (and data2, called
|
|
428
|
1001 ".data" in the strings table) get copied from the current process
|
|
|
1002 instead of the old file. */
|
|
444
|
1003 if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data")
|
|
|
1004 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
|
1005 ".sdata")
|
|
|
1006 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
|
1007 ".lit4")
|
|
|
1008 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
|
1009 ".lit8")
|
|
|
1010 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
|
1011 ".sdata1")
|
|
|
1012 || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name),
|
|
|
1013 ".data1")
|
|
|
1014 || !strcmp (old_section_names + NEW_SECTION_H (nn).sh_name,
|
|
|
1015 ".sbss"))
|
|
428
|
1016 src = (caddr_t) OLD_SECTION_H (n).sh_addr;
|
|
|
1017 else
|
|
|
1018 src = old_base + OLD_SECTION_H (n).sh_offset;
|
|
444
|
1019
|
|
428
|
1020 memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src,
|
|
|
1021 NEW_SECTION_H (nn).sh_size);
|
|
|
1022
|
|
444
|
1023 #ifdef __alpha__
|
|
|
1024 /* Update Alpha COFF symbol table: */
|
|
|
1025 if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug")
|
|
|
1026 == 0)
|
|
|
1027 {
|
|
|
1028 pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base);
|
|
|
1029
|
|
|
1030 symhdr->cbLineOffset += new_data2_size;
|
|
|
1031 symhdr->cbDnOffset += new_data2_size;
|
|
|
1032 symhdr->cbPdOffset += new_data2_size;
|
|
|
1033 symhdr->cbSymOffset += new_data2_size;
|
|
|
1034 symhdr->cbOptOffset += new_data2_size;
|
|
|
1035 symhdr->cbAuxOffset += new_data2_size;
|
|
|
1036 symhdr->cbSsOffset += new_data2_size;
|
|
|
1037 symhdr->cbSsExtOffset += new_data2_size;
|
|
|
1038 symhdr->cbFdOffset += new_data2_size;
|
|
|
1039 symhdr->cbRfdOffset += new_data2_size;
|
|
|
1040 symhdr->cbExtOffset += new_data2_size;
|
|
|
1041 }
|
|
|
1042 #endif /* __alpha__ */
|
|
|
1043
|
|
|
1044 #if defined (__sony_news) && defined (_SYSTYPE_SYSV)
|
|
|
1045 if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG
|
|
|
1046 && old_mdebug_index != -1)
|
|
|
1047 {
|
|
|
1048 int diff = NEW_SECTION_H(nn).sh_offset
|
|
|
1049 - OLD_SECTION_H(old_mdebug_index).sh_offset;
|
|
|
1050 HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base);
|
|
|
1051
|
|
|
1052 if (diff)
|
|
|
1053 {
|
|
|
1054 phdr->cbLineOffset += diff;
|
|
|
1055 phdr->cbDnOffset += diff;
|
|
|
1056 phdr->cbPdOffset += diff;
|
|
|
1057 phdr->cbSymOffset += diff;
|
|
|
1058 phdr->cbOptOffset += diff;
|
|
|
1059 phdr->cbAuxOffset += diff;
|
|
|
1060 phdr->cbSsOffset += diff;
|
|
|
1061 phdr->cbSsExtOffset += diff;
|
|
|
1062 phdr->cbFdOffset += diff;
|
|
|
1063 phdr->cbRfdOffset += diff;
|
|
|
1064 phdr->cbExtOffset += diff;
|
|
|
1065 }
|
|
|
1066 }
|
|
|
1067 #endif /* __sony_news && _SYSTYPE_SYSV */
|
|
|
1068
|
|
|
1069 #if __sgi
|
|
|
1070 /* Adjust the HDRR offsets in .mdebug and copy the
|
|
428
|
1071 line data if it's in its usual 'hole' in the object.
|
|
|
1072 Makes the new file debuggable with dbx.
|
|
|
1073 patches up two problems: the absolute file offsets
|
|
|
1074 in the HDRR record of .mdebug (see /usr/include/syms.h), and
|
|
|
1075 the ld bug that gets the line table in a hole in the
|
|
|
1076 elf file rather than in the .mdebug section proper.
|
|
|
1077 David Anderson. davea@sgi.com Jan 16,1994. */
|
|
|
1078 if (n == old_mdebug_index)
|
|
|
1079 {
|
|
|
1080 #define MDEBUGADJUST(__ct,__fileaddr) \
|
|
|
1081 if (n_phdrr->__ct > 0) \
|
|
|
1082 { \
|
|
|
1083 n_phdrr->__fileaddr += movement; \
|
|
|
1084 }
|
|
|
1085
|
|
|
1086 HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset);
|
|
|
1087 HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset);
|
|
444
|
1088 unsigned movement = new_data2_size;
|
|
428
|
1089
|
|
|
1090 MDEBUGADJUST (idnMax, cbDnOffset);
|
|
|
1091 MDEBUGADJUST (ipdMax, cbPdOffset);
|
|
|
1092 MDEBUGADJUST (isymMax, cbSymOffset);
|
|
|
1093 MDEBUGADJUST (ioptMax, cbOptOffset);
|
|
|
1094 MDEBUGADJUST (iauxMax, cbAuxOffset);
|
|
|
1095 MDEBUGADJUST (issMax, cbSsOffset);
|
|
|
1096 MDEBUGADJUST (issExtMax, cbSsExtOffset);
|
|
|
1097 MDEBUGADJUST (ifdMax, cbFdOffset);
|
|
|
1098 MDEBUGADJUST (crfd, cbRfdOffset);
|
|
|
1099 MDEBUGADJUST (iextMax, cbExtOffset);
|
|
|
1100 /* The Line Section, being possible off in a hole of the object,
|
|
|
1101 requires special handling. */
|
|
|
1102 if (n_phdrr->cbLine > 0)
|
|
|
1103 {
|
|
|
1104 if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset
|
|
|
1105 + OLD_SECTION_H (n).sh_size))
|
|
|
1106 {
|
|
|
1107 /* line data is in a hole in elf. do special copy and adjust
|
|
|
1108 for this ld mistake.
|
|
|
1109 */
|
|
|
1110 n_phdrr->cbLineOffset += movement;
|
|
|
1111
|
|
|
1112 memcpy (n_phdrr->cbLineOffset + new_base,
|
|
|
1113 o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine);
|
|
|
1114 }
|
|
|
1115 else
|
|
|
1116 {
|
|
|
1117 /* somehow line data is in .mdebug as it is supposed to be. */
|
|
|
1118 MDEBUGADJUST (cbLine, cbLineOffset);
|
|
|
1119 }
|
|
|
1120 }
|
|
|
1121 }
|
|
444
|
1122 #endif /* __sgi */
|
|
428
|
1123
|
|
444
|
1124 /* If it is the symbol table, its st_shndx field needs to be patched. */
|
|
428
|
1125 if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB
|
|
|
1126 || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM)
|
|
|
1127 {
|
|
444
|
1128 ElfW(Shdr) *spt = &NEW_SECTION_H (nn);
|
|
428
|
1129 unsigned int num = spt->sh_size / spt->sh_entsize;
|
|
444
|
1130 ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset +
|
|
|
1131 new_base);
|
|
428
|
1132 for (; num--; sym++)
|
|
|
1133 {
|
|
444
|
1134 if ((sym->st_shndx == SHN_UNDEF)
|
|
|
1135 || (sym->st_shndx == SHN_ABS)
|
|
|
1136 || (sym->st_shndx == SHN_COMMON))
|
|
428
|
1137 continue;
|
|
444
|
1138
|
|
428
|
1139 PATCH_INDEX (sym->st_shndx);
|
|
|
1140 }
|
|
|
1141 }
|
|
|
1142 }
|
|
|
1143
|
|
444
|
1144 /* Update the symbol values of _edata and _end. */
|
|
|
1145 for (n = new_file_h->e_shnum - 1; n; n--)
|
|
|
1146 {
|
|
|
1147 byte *symnames;
|
|
|
1148 ElfW(Sym) *symp, *symendp;
|
|
|
1149
|
|
|
1150 if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM
|
|
|
1151 && NEW_SECTION_H (n).sh_type != SHT_SYMTAB)
|
|
|
1152 continue;
|
|
|
1153
|
|
|
1154 symnames = ((byte *) new_base
|
|
|
1155 + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset);
|
|
|
1156 symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base);
|
|
|
1157 symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size);
|
|
|
1158
|
|
|
1159 for (; symp < symendp; symp ++)
|
|
|
1160 if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0
|
|
|
1161 || strcmp ((char *) (symnames + symp->st_name), "end") == 0
|
|
|
1162 || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0
|
|
|
1163 || strcmp ((char *) (symnames + symp->st_name), "edata") == 0)
|
|
|
1164 memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr));
|
|
|
1165 }
|
|
|
1166
|
|
|
1167 /* This loop seeks out relocation sections for the data section, so
|
|
|
1168 that it can undo relocations performed by the runtime linker. */
|
|
|
1169 for (n = new_file_h->e_shnum - 1; n; n--)
|
|
|
1170 {
|
|
|
1171 ElfW(Shdr) section = NEW_SECTION_H (n);
|
|
|
1172 switch (section.sh_type) {
|
|
|
1173 default:
|
|
|
1174 break;
|
|
|
1175 case SHT_REL:
|
|
|
1176 case SHT_RELA:
|
|
|
1177 /* This code handles two different size structs, but there should
|
|
|
1178 be no harm in that provided that r_offset is always the first
|
|
|
1179 member. */
|
|
|
1180 nn = section.sh_info;
|
|
|
1181 if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data")
|
|
|
1182 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
1183 ".sdata")
|
|
|
1184 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
1185 ".lit4")
|
|
|
1186 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
1187 ".lit8")
|
|
|
1188 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
1189 ".sdata1")
|
|
|
1190 || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name),
|
|
|
1191 ".data1"))
|
|
|
1192 {
|
|
|
1193 ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr -
|
|
|
1194 NEW_SECTION_H (nn).sh_offset;
|
|
|
1195 caddr_t reloc = old_base + section.sh_offset, end;
|
|
|
1196 for (end = reloc + section.sh_size; reloc < end;
|
|
|
1197 reloc += section.sh_entsize)
|
|
|
1198 {
|
|
|
1199 ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset;
|
|
|
1200 #ifdef __alpha__
|
|
|
1201 /* The Alpha ELF binutils currently have a bug that
|
|
|
1202 sometimes results in relocs that contain all
|
|
|
1203 zeroes. Work around this for now... */
|
|
|
1204 if (((ElfW(Rel) *) reloc)->r_offset == 0)
|
|
|
1205 continue;
|
|
|
1206 #endif
|
|
|
1207 memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr)));
|
|
|
1208 }
|
|
|
1209 }
|
|
|
1210 break;
|
|
|
1211 }
|
|
|
1212 }
|
|
|
1213
|
|
|
1214 #ifdef UNEXEC_USE_MAP_PRIVATE
|
|
|
1215 if (lseek (new_file, 0, SEEK_SET) == -1)
|
|
|
1216 fatal ("Can't rewind (%s): errno %d\n", new_name, errno);
|
|
|
1217
|
|
|
1218 if (write (new_file, new_base, new_file_size) != new_file_size)
|
|
|
1219 fatal ("Can't write (%s): errno %d\n", new_name, errno);
|
|
|
1220 #endif
|
|
|
1221
|
|
428
|
1222 /* Close the files and make the new file executable. */
|
|
|
1223
|
|
|
1224 if (close (old_file))
|
|
|
1225 fatal ("Can't close (%s): errno %d\n", old_name, errno);
|
|
|
1226
|
|
|
1227 if (close (new_file))
|
|
|
1228 fatal ("Can't close (%s): errno %d\n", new_name, errno);
|
|
|
1229
|
|
|
1230 if (stat (new_name, &stat_buf) == -1)
|
|
|
1231 fatal ("Can't stat (%s): errno %d\n", new_name, errno);
|
|
|
1232
|
|
|
1233 n = umask (777);
|
|
|
1234 umask (n);
|
|
|
1235 stat_buf.st_mode |= 0111 & ~n;
|
|
|
1236 if (chmod (new_name, stat_buf.st_mode) == -1)
|
|
|
1237 fatal ("Can't chmod (%s): errno %d\n", new_name, errno);
|
|
|
1238 }
|
