1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini insmod implementation for busybox
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4 | *
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5 | * This version of insmod supports ARM, CRIS, H8/300, x86, ia64, x86_64,
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6 | * m68k, MIPS, PowerPC, S390, SH3/4/5, Sparc, v850e, and x86_64.
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7 | *
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8 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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9 | * and Ron Alder <alder@lineo.com>
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10 | *
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11 | * Rodney Radford <rradford@mindspring.com> 17-Aug-2004.
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12 | * Added x86_64 support.
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13 | *
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14 | * Miles Bader <miles@gnu.org> added NEC V850E support.
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15 | *
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16 | * Modified by Bryan Rittmeyer <bryan@ixiacom.com> to support SH4
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17 | * and (theoretically) SH3. I have only tested SH4 in little endian mode.
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18 | *
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19 | * Modified by Alcove, Julien Gaulmin <julien.gaulmin@alcove.fr> and
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20 | * Nicolas Ferre <nicolas.ferre@alcove.fr> to support ARM7TDMI. Only
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21 | * very minor changes required to also work with StrongArm and presumably
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22 | * all ARM based systems.
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23 | *
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24 | * Yoshinori Sato <ysato@users.sourceforge.jp> 19-May-2004.
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25 | * added Renesas H8/300 support.
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26 | *
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27 | * Paul Mundt <lethal@linux-sh.org> 08-Aug-2003.
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28 | * Integrated support for sh64 (SH-5), from preliminary modutils
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29 | * patches from Benedict Gaster <benedict.gaster@superh.com>.
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30 | * Currently limited to support for 32bit ABI.
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31 | *
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32 | * Magnus Damm <damm@opensource.se> 22-May-2002.
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33 | * The plt and got code are now using the same structs.
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34 | * Added generic linked list code to fully support PowerPC.
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35 | * Replaced the mess in arch_apply_relocation() with architecture blocks.
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36 | * The arch_create_got() function got cleaned up with architecture blocks.
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37 | * These blocks should be easy maintain and sync with obj_xxx.c in modutils.
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38 | *
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39 | * Magnus Damm <damm@opensource.se> added PowerPC support 20-Feb-2001.
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40 | * PowerPC specific code stolen from modutils-2.3.16,
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41 | * written by Paul Mackerras, Copyright 1996, 1997 Linux International.
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42 | * I've only tested the code on mpc8xx platforms in big-endian mode.
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43 | * Did some cleanup and added USE_xxx_ENTRIES...
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44 | *
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45 | * Quinn Jensen <jensenq@lineo.com> added MIPS support 23-Feb-2001.
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46 | * based on modutils-2.4.2
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47 | * MIPS specific support for Elf loading and relocation.
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48 | * Copyright 1996, 1997 Linux International.
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49 | * Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>
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50 | *
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51 | * Based almost entirely on the Linux modutils-2.3.11 implementation.
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52 | * Copyright 1996, 1997 Linux International.
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53 | * New implementation contributed by Richard Henderson <rth@tamu.edu>
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54 | * Based on original work by Bjorn Ekwall <bj0rn@blox.se>
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55 | * Restructured (and partly rewritten) by:
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56 | * Björn Ekwall <bj0rn@blox.se> February 1999
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57 | *
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58 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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59 | */
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60 |
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61 | #include "libbb.h"
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62 | #include "modutils.h"
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63 | #include <sys/utsname.h>
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64 |
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65 | #if ENABLE_FEATURE_INSMOD_LOADINKMEM
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66 | #define LOADBITS 0
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67 | #else
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68 | #define LOADBITS 1
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69 | #endif
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70 |
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71 | /* Alpha */
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72 | #if defined(__alpha__)
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73 | #define MATCH_MACHINE(x) (x == EM_ALPHA)
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74 | #define SHT_RELM SHT_RELA
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75 | #define Elf64_RelM Elf64_Rela
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76 | #define ELFCLASSM ELFCLASS64
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77 | #endif
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78 |
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79 | /* ARM support */
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80 | #if defined(__arm__)
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81 | #define MATCH_MACHINE(x) (x == EM_ARM)
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82 | #define SHT_RELM SHT_REL
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83 | #define Elf32_RelM Elf32_Rel
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84 | #define ELFCLASSM ELFCLASS32
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85 | #define USE_PLT_ENTRIES
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86 | #define PLT_ENTRY_SIZE 8
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87 | #define USE_GOT_ENTRIES
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88 | #define GOT_ENTRY_SIZE 8
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89 | #define USE_SINGLE
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90 | #endif
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91 |
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92 | /* NDS32 support */
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93 | #if defined(__nds32__) || defined(__NDS32__)
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94 | #define CONFIG_USE_GOT_ENTRIES
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95 | #define CONFIG_GOT_ENTRY_SIZE 4
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96 | #define CONFIG_USE_SINGLE
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97 |
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98 | #if defined(__NDS32_EB__)
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99 | #define MATCH_MACHINE(x) (x == EM_NDS32)
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100 | #define SHT_RELM SHT_RELA
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101 | #define Elf32_RelM Elf32_Rela
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102 | #define ELFCLASSM ELFCLASS32
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103 | #endif
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104 |
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105 | #if defined(__NDS32_EL__)
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106 | #define MATCH_MACHINE(x) (x == EM_NDS32)
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107 | #define SHT_RELM SHT_RELA
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108 | #define Elf32_RelM Elf32_Rela
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109 | #define ELFCLASSM ELFCLASS32
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110 | #endif
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111 | #endif
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112 |
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113 | /* blackfin */
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114 | #if defined(BFIN)
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115 | #define MATCH_MACHINE(x) (x == EM_BLACKFIN)
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116 | #define SHT_RELM SHT_RELA
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117 | #define Elf32_RelM Elf32_Rela
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118 | #define ELFCLASSM ELFCLASS32
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119 | #endif
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120 |
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121 | /* CRIS */
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122 | #if defined(__cris__)
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123 | #define MATCH_MACHINE(x) (x == EM_CRIS)
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124 | #define SHT_RELM SHT_RELA
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125 | #define Elf32_RelM Elf32_Rela
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126 | #define ELFCLASSM ELFCLASS32
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127 | #ifndef EM_CRIS
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128 | #define EM_CRIS 76
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129 | #define R_CRIS_NONE 0
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130 | #define R_CRIS_32 3
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131 | #endif
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132 | #endif
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133 |
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134 | /* H8/300 */
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135 | #if defined(__H8300H__) || defined(__H8300S__)
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136 | #define MATCH_MACHINE(x) (x == EM_H8_300)
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137 | #define SHT_RELM SHT_RELA
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138 | #define Elf32_RelM Elf32_Rela
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139 | #define ELFCLASSM ELFCLASS32
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140 | #define USE_SINGLE
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141 | #define SYMBOL_PREFIX "_"
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142 | #endif
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143 |
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144 | /* PA-RISC / HP-PA */
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145 | #if defined(__hppa__)
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146 | #define MATCH_MACHINE(x) (x == EM_PARISC)
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147 | #define SHT_RELM SHT_RELA
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148 | #if defined(__LP64__)
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149 | #define Elf64_RelM Elf64_Rela
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150 | #define ELFCLASSM ELFCLASS64
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151 | #else
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152 | #define Elf32_RelM Elf32_Rela
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153 | #define ELFCLASSM ELFCLASS32
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154 | #endif
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155 | #endif
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156 |
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157 | /* x86 */
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158 | #if defined(__i386__)
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159 | #ifndef EM_486
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160 | #define MATCH_MACHINE(x) (x == EM_386)
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161 | #else
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162 | #define MATCH_MACHINE(x) (x == EM_386 || x == EM_486)
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163 | #endif
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164 | #define SHT_RELM SHT_REL
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165 | #define Elf32_RelM Elf32_Rel
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166 | #define ELFCLASSM ELFCLASS32
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167 | #define USE_GOT_ENTRIES
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168 | #define GOT_ENTRY_SIZE 4
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169 | #define USE_SINGLE
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170 | #endif
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171 |
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172 | /* IA64, aka Itanium */
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173 | #if defined(__ia64__)
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174 | #define MATCH_MACHINE(x) (x == EM_IA_64)
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175 | #define SHT_RELM SHT_RELA
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176 | #define Elf64_RelM Elf64_Rela
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177 | #define ELFCLASSM ELFCLASS64
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178 | #endif
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179 |
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180 | /* m68k */
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181 | #if defined(__mc68000__)
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182 | #define MATCH_MACHINE(x) (x == EM_68K)
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183 | #define SHT_RELM SHT_RELA
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184 | #define Elf32_RelM Elf32_Rela
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185 | #define ELFCLASSM ELFCLASS32
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186 | #define USE_GOT_ENTRIES
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187 | #define GOT_ENTRY_SIZE 4
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188 | #define USE_SINGLE
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189 | #endif
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190 |
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191 | /* Microblaze */
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192 | #if defined(__microblaze__)
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193 | #define USE_SINGLE
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194 | #include <linux/elf-em.h>
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195 | #define MATCH_MACHINE(x) (x == EM_XILINX_MICROBLAZE)
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196 | #define SHT_RELM SHT_RELA
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197 | #define Elf32_RelM Elf32_Rela
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198 | #define ELFCLASSM ELFCLASS32
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199 | #endif
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200 |
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201 | /* MIPS */
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202 | #if defined(__mips__)
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203 | #define MATCH_MACHINE(x) (x == EM_MIPS || x == EM_MIPS_RS3_LE)
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204 | #define SHT_RELM SHT_REL
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205 | #define Elf32_RelM Elf32_Rel
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206 | #define ELFCLASSM ELFCLASS32
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207 | /* Account for ELF spec changes. */
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208 | #ifndef EM_MIPS_RS3_LE
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209 | #ifdef EM_MIPS_RS4_BE
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210 | #define EM_MIPS_RS3_LE EM_MIPS_RS4_BE
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211 | #else
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212 | #define EM_MIPS_RS3_LE 10
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213 | #endif
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214 | #endif /* !EM_MIPS_RS3_LE */
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215 | #define ARCHDATAM "__dbe_table"
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216 | #endif
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217 |
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218 | /* Nios II */
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219 | #if defined(__nios2__)
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220 | #define MATCH_MACHINE(x) (x == EM_ALTERA_NIOS2)
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221 | #define SHT_RELM SHT_RELA
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222 | #define Elf32_RelM Elf32_Rela
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223 | #define ELFCLASSM ELFCLASS32
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224 | #endif
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225 |
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226 | /* PowerPC */
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227 | #if defined(__powerpc64__)
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228 | #define MATCH_MACHINE(x) (x == EM_PPC64)
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229 | #define SHT_RELM SHT_RELA
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230 | #define Elf64_RelM Elf64_Rela
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231 | #define ELFCLASSM ELFCLASS64
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232 | #elif defined(__powerpc__)
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233 | #define MATCH_MACHINE(x) (x == EM_PPC)
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234 | #define SHT_RELM SHT_RELA
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235 | #define Elf32_RelM Elf32_Rela
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236 | #define ELFCLASSM ELFCLASS32
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237 | #define USE_PLT_ENTRIES
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238 | #define PLT_ENTRY_SIZE 16
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239 | #define USE_PLT_LIST
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240 | #define LIST_ARCHTYPE ElfW(Addr)
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241 | #define USE_LIST
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242 | #define ARCHDATAM "__ftr_fixup"
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243 | #endif
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244 |
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245 | /* S390 */
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246 | #if defined(__s390__)
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247 | #define MATCH_MACHINE(x) (x == EM_S390)
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248 | #define SHT_RELM SHT_RELA
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249 | #define Elf32_RelM Elf32_Rela
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250 | #define ELFCLASSM ELFCLASS32
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251 | #define USE_PLT_ENTRIES
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252 | #define PLT_ENTRY_SIZE 8
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253 | #define USE_GOT_ENTRIES
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254 | #define GOT_ENTRY_SIZE 8
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255 | #define USE_SINGLE
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256 | #endif
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257 |
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258 | /* SuperH */
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259 | #if defined(__sh__)
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260 | #define MATCH_MACHINE(x) (x == EM_SH)
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261 | #define SHT_RELM SHT_RELA
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262 | #define Elf32_RelM Elf32_Rela
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263 | #define ELFCLASSM ELFCLASS32
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264 | #define USE_GOT_ENTRIES
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265 | #define GOT_ENTRY_SIZE 4
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266 | #define USE_SINGLE
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267 | /* the SH changes have only been tested in =little endian= mode */
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268 | /* I'm not sure about big endian, so let's warn: */
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269 | #if defined(__sh__) && BB_BIG_ENDIAN
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270 | # error insmod.c may require changes for use on big endian SH
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271 | #endif
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272 | /* it may or may not work on the SH1/SH2... Error on those also */
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273 | #if ((!(defined(__SH3__) || defined(__SH4__) || defined(__SH5__)))) && (defined(__sh__))
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274 | #error insmod.c may require changes for SH1 or SH2 use
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275 | #endif
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276 | #endif
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277 |
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278 | /* Sparc */
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279 | #if defined(__sparc__)
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280 | #define MATCH_MACHINE(x) (x == EM_SPARC)
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281 | #define SHT_RELM SHT_RELA
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282 | #define Elf32_RelM Elf32_Rela
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283 | #define ELFCLASSM ELFCLASS32
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284 | #endif
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285 |
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286 | /* v850e */
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287 | #if defined(__v850e__)
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288 | #define MATCH_MACHINE(x) ((x) == EM_V850 || (x) == EM_CYGNUS_V850)
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289 | #define SHT_RELM SHT_RELA
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290 | #define Elf32_RelM Elf32_Rela
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291 | #define ELFCLASSM ELFCLASS32
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292 | #define USE_PLT_ENTRIES
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293 | #define PLT_ENTRY_SIZE 8
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294 | #define USE_SINGLE
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295 | #ifndef EM_CYGNUS_V850 /* grumble */
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296 | #define EM_CYGNUS_V850 0x9080
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297 | #endif
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298 | #define SYMBOL_PREFIX "_"
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299 | #endif
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300 |
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301 | /* X86_64 */
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302 | #if defined(__x86_64__)
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303 | #define MATCH_MACHINE(x) (x == EM_X86_64)
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304 | #define SHT_RELM SHT_RELA
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305 | #define USE_GOT_ENTRIES
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306 | #define GOT_ENTRY_SIZE 8
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307 | #define USE_SINGLE
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308 | #define Elf64_RelM Elf64_Rela
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309 | #define ELFCLASSM ELFCLASS64
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310 | #endif
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311 |
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312 | #ifndef SHT_RELM
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313 | #error Sorry, but insmod.c does not yet support this architecture...
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314 | #endif
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315 |
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316 |
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317 | //----------------------------------------------------------------------------
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318 | //--------modutils module.h, lines 45-242
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319 | //----------------------------------------------------------------------------
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320 |
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321 | /* Definitions for the Linux module syscall interface.
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322 | Copyright 1996, 1997 Linux International.
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323 |
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324 | Contributed by Richard Henderson <rth@tamu.edu>
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325 |
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326 | This file is part of the Linux modutils.
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327 |
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328 | This program is free software; you can redistribute it and/or modify it
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329 | under the terms of the GNU General Public License as published by the
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330 | Free Software Foundation; either version 2 of the License, or (at your
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331 | option) any later version.
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332 |
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333 | This program is distributed in the hope that it will be useful, but
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334 | WITHOUT ANY WARRANTY; without even the implied warranty of
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335 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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336 | General Public License for more details.
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337 |
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338 | You should have received a copy of the GNU General Public License
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339 | along with this program; if not, write to the Free Software Foundation,
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340 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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341 |
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342 |
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343 | #ifndef MODUTILS_MODULE_H
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344 |
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345 | /*======================================================================*/
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346 | /* For sizeof() which are related to the module platform and not to the
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347 | environment isnmod is running in, use sizeof_xx instead of sizeof(xx). */
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348 |
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349 | #define tgt_sizeof_char sizeof(char)
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350 | #define tgt_sizeof_short sizeof(short)
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351 | #define tgt_sizeof_int sizeof(int)
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352 | #define tgt_sizeof_long sizeof(long)
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353 | #define tgt_sizeof_char_p sizeof(char *)
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354 | #define tgt_sizeof_void_p sizeof(void *)
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355 | #define tgt_long long
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356 |
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357 | #if defined(__sparc__) && !defined(__sparc_v9__) && defined(ARCH_sparc64)
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358 | #undef tgt_sizeof_long
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359 | #undef tgt_sizeof_char_p
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360 | #undef tgt_sizeof_void_p
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361 | #undef tgt_long
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362 | enum {
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363 | tgt_sizeof_long = 8,
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364 | tgt_sizeof_char_p = 8,
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365 | tgt_sizeof_void_p = 8
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366 | };
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367 | #define tgt_long long long
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368 | #endif
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369 |
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370 | /*======================================================================*/
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371 | /* The structures used in Linux 2.1. */
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372 |
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373 | /* Note: new_module_symbol does not use tgt_long intentionally */
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374 | struct new_module_symbol {
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375 | unsigned long value;
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376 | unsigned long name;
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377 | };
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378 |
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379 | struct new_module_persist;
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380 |
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381 | struct new_module_ref {
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382 | unsigned tgt_long dep; /* kernel addresses */
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383 | unsigned tgt_long ref;
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384 | unsigned tgt_long next_ref;
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385 | };
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386 |
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387 | struct new_module {
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388 | unsigned tgt_long size_of_struct; /* == sizeof(module) */
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389 | unsigned tgt_long next;
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390 | unsigned tgt_long name;
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391 | unsigned tgt_long size;
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392 |
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393 | tgt_long usecount;
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394 | unsigned tgt_long flags; /* AUTOCLEAN et al */
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395 |
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396 | unsigned nsyms;
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397 | unsigned ndeps;
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398 |
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399 | unsigned tgt_long syms;
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400 | unsigned tgt_long deps;
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401 | unsigned tgt_long refs;
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402 | unsigned tgt_long init;
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403 | unsigned tgt_long cleanup;
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404 | unsigned tgt_long ex_table_start;
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405 | unsigned tgt_long ex_table_end;
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406 | #ifdef __alpha__
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407 | unsigned tgt_long gp;
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408 | #endif
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409 | /* Everything after here is extension. */
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410 | unsigned tgt_long persist_start;
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411 | unsigned tgt_long persist_end;
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412 | unsigned tgt_long can_unload;
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413 | unsigned tgt_long runsize;
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414 | const char *kallsyms_start; /* All symbols for kernel debugging */
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415 | const char *kallsyms_end;
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416 | const char *archdata_start; /* arch specific data for module */
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417 | const char *archdata_end;
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418 | const char *kernel_data; /* Reserved for kernel internal use */
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419 | };
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420 |
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421 | #ifdef ARCHDATAM
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422 | #define ARCHDATA_SEC_NAME ARCHDATAM
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423 | #else
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424 | #define ARCHDATA_SEC_NAME "__archdata"
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425 | #endif
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426 | #define KALLSYMS_SEC_NAME "__kallsyms"
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427 |
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---|
428 |
|
---|
429 | struct new_module_info {
|
---|
430 | unsigned long addr;
|
---|
431 | unsigned long size;
|
---|
432 | unsigned long flags;
|
---|
433 | long usecount;
|
---|
434 | };
|
---|
435 |
|
---|
436 | /* Bits of module.flags. */
|
---|
437 | enum {
|
---|
438 | NEW_MOD_RUNNING = 1,
|
---|
439 | NEW_MOD_DELETED = 2,
|
---|
440 | NEW_MOD_AUTOCLEAN = 4,
|
---|
441 | NEW_MOD_VISITED = 8,
|
---|
442 | NEW_MOD_USED_ONCE = 16
|
---|
443 | };
|
---|
444 |
|
---|
445 | int init_module(const char *name, const struct new_module *);
|
---|
446 | int query_module(const char *name, int which, void *buf,
|
---|
447 | size_t bufsize, size_t *ret);
|
---|
448 |
|
---|
449 | /* Values for query_module's which. */
|
---|
450 | enum {
|
---|
451 | QM_MODULES = 1,
|
---|
452 | QM_DEPS = 2,
|
---|
453 | QM_REFS = 3,
|
---|
454 | QM_SYMBOLS = 4,
|
---|
455 | QM_INFO = 5
|
---|
456 | };
|
---|
457 |
|
---|
458 | /*======================================================================*/
|
---|
459 | /* The system calls unchanged between 2.0 and 2.1. */
|
---|
460 |
|
---|
461 | unsigned long create_module(const char *, size_t);
|
---|
462 | int delete_module(const char *module, unsigned int flags);
|
---|
463 |
|
---|
464 |
|
---|
465 | #endif /* module.h */
|
---|
466 |
|
---|
467 | //----------------------------------------------------------------------------
|
---|
468 | //--------end of modutils module.h
|
---|
469 | //----------------------------------------------------------------------------
|
---|
470 |
|
---|
471 |
|
---|
472 |
|
---|
473 | //----------------------------------------------------------------------------
|
---|
474 | //--------modutils obj.h, lines 253-462
|
---|
475 | //----------------------------------------------------------------------------
|
---|
476 |
|
---|
477 | /* Elf object file loading and relocation routines.
|
---|
478 | Copyright 1996, 1997 Linux International.
|
---|
479 |
|
---|
480 | Contributed by Richard Henderson <rth@tamu.edu>
|
---|
481 |
|
---|
482 | This file is part of the Linux modutils.
|
---|
483 |
|
---|
484 | This program is free software; you can redistribute it and/or modify it
|
---|
485 | under the terms of the GNU General Public License as published by the
|
---|
486 | Free Software Foundation; either version 2 of the License, or (at your
|
---|
487 | option) any later version.
|
---|
488 |
|
---|
489 | This program is distributed in the hope that it will be useful, but
|
---|
490 | WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
491 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
---|
492 | General Public License for more details.
|
---|
493 |
|
---|
494 | You should have received a copy of the GNU General Public License
|
---|
495 | along with this program; if not, write to the Free Software Foundation,
|
---|
496 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
---|
497 |
|
---|
498 |
|
---|
499 | #ifndef MODUTILS_OBJ_H
|
---|
500 |
|
---|
501 | /* The relocatable object is manipulated using elfin types. */
|
---|
502 |
|
---|
503 | #include <elf.h>
|
---|
504 | #include <endian.h>
|
---|
505 |
|
---|
506 | #ifndef ElfW
|
---|
507 | # if ELFCLASSM == ELFCLASS32
|
---|
508 | # define ElfW(x) Elf32_ ## x
|
---|
509 | # define ELFW(x) ELF32_ ## x
|
---|
510 | # else
|
---|
511 | # define ElfW(x) Elf64_ ## x
|
---|
512 | # define ELFW(x) ELF64_ ## x
|
---|
513 | # endif
|
---|
514 | #endif
|
---|
515 |
|
---|
516 | /* For some reason this is missing from some ancient C libraries.... */
|
---|
517 | #ifndef ELF32_ST_INFO
|
---|
518 | # define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
|
---|
519 | #endif
|
---|
520 |
|
---|
521 | #ifndef ELF64_ST_INFO
|
---|
522 | # define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
|
---|
523 | #endif
|
---|
524 |
|
---|
525 | #define ELF_ST_BIND(info) ELFW(ST_BIND)(info)
|
---|
526 | #define ELF_ST_TYPE(info) ELFW(ST_TYPE)(info)
|
---|
527 | #define ELF_ST_INFO(bind, type) ELFW(ST_INFO)(bind, type)
|
---|
528 | #define ELF_R_TYPE(val) ELFW(R_TYPE)(val)
|
---|
529 | #define ELF_R_SYM(val) ELFW(R_SYM)(val)
|
---|
530 |
|
---|
531 | struct obj_string_patch;
|
---|
532 | struct obj_symbol_patch;
|
---|
533 |
|
---|
534 | struct obj_section {
|
---|
535 | ElfW(Shdr) header;
|
---|
536 | const char *name;
|
---|
537 | char *contents;
|
---|
538 | struct obj_section *load_next;
|
---|
539 | int idx;
|
---|
540 | };
|
---|
541 |
|
---|
542 | struct obj_symbol {
|
---|
543 | struct obj_symbol *next; /* hash table link */
|
---|
544 | const char *name;
|
---|
545 | unsigned long value;
|
---|
546 | unsigned long size;
|
---|
547 | int secidx; /* the defining section index/module */
|
---|
548 | int info;
|
---|
549 | int ksymidx; /* for export to the kernel symtab */
|
---|
550 | int referenced; /* actually used in the link */
|
---|
551 | };
|
---|
552 |
|
---|
553 | /* Hardcode the hash table size. We shouldn't be needing so many
|
---|
554 | symbols that we begin to degrade performance, and we get a big win
|
---|
555 | by giving the compiler a constant divisor. */
|
---|
556 |
|
---|
557 | #define HASH_BUCKETS 521
|
---|
558 |
|
---|
559 | struct obj_file {
|
---|
560 | ElfW(Ehdr) header;
|
---|
561 | ElfW(Addr) baseaddr;
|
---|
562 | struct obj_section **sections;
|
---|
563 | struct obj_section *load_order;
|
---|
564 | struct obj_section **load_order_search_start;
|
---|
565 | struct obj_string_patch *string_patches;
|
---|
566 | struct obj_symbol_patch *symbol_patches;
|
---|
567 | int (*symbol_cmp)(const char *, const char *); /* cant be FAST_FUNC */
|
---|
568 | unsigned long (*symbol_hash)(const char *) FAST_FUNC;
|
---|
569 | unsigned long local_symtab_size;
|
---|
570 | struct obj_symbol **local_symtab;
|
---|
571 | struct obj_symbol *symtab[HASH_BUCKETS];
|
---|
572 | };
|
---|
573 |
|
---|
574 | enum obj_reloc {
|
---|
575 | obj_reloc_ok,
|
---|
576 | obj_reloc_overflow,
|
---|
577 | obj_reloc_dangerous,
|
---|
578 | obj_reloc_unhandled
|
---|
579 | };
|
---|
580 |
|
---|
581 | struct obj_string_patch {
|
---|
582 | struct obj_string_patch *next;
|
---|
583 | int reloc_secidx;
|
---|
584 | ElfW(Addr) reloc_offset;
|
---|
585 | ElfW(Addr) string_offset;
|
---|
586 | };
|
---|
587 |
|
---|
588 | struct obj_symbol_patch {
|
---|
589 | struct obj_symbol_patch *next;
|
---|
590 | int reloc_secidx;
|
---|
591 | ElfW(Addr) reloc_offset;
|
---|
592 | struct obj_symbol *sym;
|
---|
593 | };
|
---|
594 |
|
---|
595 |
|
---|
596 | /* Generic object manipulation routines. */
|
---|
597 |
|
---|
598 | static unsigned long FAST_FUNC obj_elf_hash(const char *);
|
---|
599 |
|
---|
600 | static unsigned long obj_elf_hash_n(const char *, unsigned long len);
|
---|
601 |
|
---|
602 | static struct obj_symbol *obj_find_symbol(struct obj_file *f,
|
---|
603 | const char *name);
|
---|
604 |
|
---|
605 | static ElfW(Addr) obj_symbol_final_value(struct obj_file *f,
|
---|
606 | struct obj_symbol *sym);
|
---|
607 |
|
---|
608 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
609 | static void obj_set_symbol_compare(struct obj_file *f,
|
---|
610 | int (*cmp)(const char *, const char *),
|
---|
611 | unsigned long (*hash)(const char *) FAST_FUNC);
|
---|
612 | #endif
|
---|
613 |
|
---|
614 | static struct obj_section *obj_find_section(struct obj_file *f,
|
---|
615 | const char *name);
|
---|
616 |
|
---|
617 | static void obj_insert_section_load_order(struct obj_file *f,
|
---|
618 | struct obj_section *sec);
|
---|
619 |
|
---|
620 | static struct obj_section *obj_create_alloced_section(struct obj_file *f,
|
---|
621 | const char *name,
|
---|
622 | unsigned long align,
|
---|
623 | unsigned long size);
|
---|
624 |
|
---|
625 | static struct obj_section *obj_create_alloced_section_first(struct obj_file *f,
|
---|
626 | const char *name,
|
---|
627 | unsigned long align,
|
---|
628 | unsigned long size);
|
---|
629 |
|
---|
630 | static void *obj_extend_section(struct obj_section *sec, unsigned long more);
|
---|
631 |
|
---|
632 | static void obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
|
---|
633 | const char *string);
|
---|
634 |
|
---|
635 | static void obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
|
---|
636 | struct obj_symbol *sym);
|
---|
637 |
|
---|
638 | static void obj_check_undefineds(struct obj_file *f);
|
---|
639 |
|
---|
640 | static void obj_allocate_commons(struct obj_file *f);
|
---|
641 |
|
---|
642 | static unsigned long obj_load_size(struct obj_file *f);
|
---|
643 |
|
---|
644 | static int obj_relocate(struct obj_file *f, ElfW(Addr) base);
|
---|
645 |
|
---|
646 | #if !LOADBITS
|
---|
647 | #define obj_load(image, image_size, loadprogbits) \
|
---|
648 | obj_load(image, image_size)
|
---|
649 | #endif
|
---|
650 | static struct obj_file *obj_load(char *image, size_t image_size, int loadprogbits);
|
---|
651 |
|
---|
652 | static int obj_create_image(struct obj_file *f, char *image);
|
---|
653 |
|
---|
654 | /* Architecture specific manipulation routines. */
|
---|
655 |
|
---|
656 | static struct obj_file *arch_new_file(void);
|
---|
657 |
|
---|
658 | static struct obj_section *arch_new_section(void);
|
---|
659 |
|
---|
660 | static struct obj_symbol *arch_new_symbol(void);
|
---|
661 |
|
---|
662 | static enum obj_reloc arch_apply_relocation(struct obj_file *f,
|
---|
663 | struct obj_section *targsec,
|
---|
664 | /*struct obj_section *symsec,*/
|
---|
665 | struct obj_symbol *sym,
|
---|
666 | ElfW(RelM) *rel, ElfW(Addr) value);
|
---|
667 |
|
---|
668 | static void arch_create_got(struct obj_file *f);
|
---|
669 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
|
---|
670 | static int obj_gpl_license(struct obj_file *f, const char **license);
|
---|
671 | #endif
|
---|
672 | #endif /* obj.h */
|
---|
673 | //----------------------------------------------------------------------------
|
---|
674 | //--------end of modutils obj.h
|
---|
675 | //----------------------------------------------------------------------------
|
---|
676 |
|
---|
677 |
|
---|
678 | /* SPFX is always a string, so it can be concatenated to string constants. */
|
---|
679 | #ifdef SYMBOL_PREFIX
|
---|
680 | #define SPFX SYMBOL_PREFIX
|
---|
681 | #else
|
---|
682 | #define SPFX ""
|
---|
683 | #endif
|
---|
684 |
|
---|
685 | enum { STRVERSIONLEN = 64 };
|
---|
686 |
|
---|
687 | /*======================================================================*/
|
---|
688 |
|
---|
689 | #define flag_force_load (option_mask32 & INSMOD_OPT_FORCE)
|
---|
690 | #define flag_autoclean (option_mask32 & INSMOD_OPT_KERNELD)
|
---|
691 | #define flag_verbose (option_mask32 & INSMOD_OPT_VERBOSE)
|
---|
692 | #define flag_quiet (option_mask32 & INSMOD_OPT_SILENT)
|
---|
693 | #define flag_noexport (option_mask32 & INSMOD_OPT_NO_EXPORT)
|
---|
694 | #define flag_print_load_map (option_mask32 & INSMOD_OPT_PRINT_MAP)
|
---|
695 |
|
---|
696 | /*======================================================================*/
|
---|
697 |
|
---|
698 | #if defined(USE_LIST)
|
---|
699 |
|
---|
700 | struct arch_list_entry {
|
---|
701 | struct arch_list_entry *next;
|
---|
702 | LIST_ARCHTYPE addend;
|
---|
703 | int offset;
|
---|
704 | int inited : 1;
|
---|
705 | };
|
---|
706 |
|
---|
707 | #endif
|
---|
708 |
|
---|
709 | #if defined(USE_SINGLE)
|
---|
710 |
|
---|
711 | struct arch_single_entry {
|
---|
712 | int offset;
|
---|
713 | int inited : 1;
|
---|
714 | int allocated : 1;
|
---|
715 | };
|
---|
716 |
|
---|
717 | #endif
|
---|
718 |
|
---|
719 | #if defined(__mips__)
|
---|
720 | struct mips_hi16 {
|
---|
721 | struct mips_hi16 *next;
|
---|
722 | ElfW(Addr) *addr;
|
---|
723 | ElfW(Addr) value;
|
---|
724 | };
|
---|
725 | #endif
|
---|
726 |
|
---|
727 | struct arch_file {
|
---|
728 | struct obj_file root;
|
---|
729 | #if defined(USE_PLT_ENTRIES)
|
---|
730 | struct obj_section *plt;
|
---|
731 | #endif
|
---|
732 | #if defined(USE_GOT_ENTRIES)
|
---|
733 | struct obj_section *got;
|
---|
734 | #endif
|
---|
735 | #if defined(__mips__)
|
---|
736 | struct mips_hi16 *mips_hi16_list;
|
---|
737 | #endif
|
---|
738 | };
|
---|
739 |
|
---|
740 | struct arch_symbol {
|
---|
741 | struct obj_symbol root;
|
---|
742 | #if defined(USE_PLT_ENTRIES)
|
---|
743 | #if defined(USE_PLT_LIST)
|
---|
744 | struct arch_list_entry *pltent;
|
---|
745 | #else
|
---|
746 | struct arch_single_entry pltent;
|
---|
747 | #endif
|
---|
748 | #endif
|
---|
749 | #if defined(USE_GOT_ENTRIES)
|
---|
750 | struct arch_single_entry gotent;
|
---|
751 | #endif
|
---|
752 | };
|
---|
753 |
|
---|
754 |
|
---|
755 | struct external_module {
|
---|
756 | const char *name;
|
---|
757 | ElfW(Addr) addr;
|
---|
758 | int used;
|
---|
759 | size_t nsyms;
|
---|
760 | struct new_module_symbol *syms;
|
---|
761 | };
|
---|
762 |
|
---|
763 | static struct new_module_symbol *ksyms;
|
---|
764 | static size_t nksyms;
|
---|
765 |
|
---|
766 | static struct external_module *ext_modules;
|
---|
767 | static int n_ext_modules;
|
---|
768 | static int n_ext_modules_used;
|
---|
769 |
|
---|
770 | /*======================================================================*/
|
---|
771 |
|
---|
772 |
|
---|
773 | static struct obj_file *arch_new_file(void)
|
---|
774 | {
|
---|
775 | struct arch_file *f;
|
---|
776 | f = xzalloc(sizeof(*f));
|
---|
777 | return &f->root; /* it's a first member */
|
---|
778 | }
|
---|
779 |
|
---|
780 | static struct obj_section *arch_new_section(void)
|
---|
781 | {
|
---|
782 | return xzalloc(sizeof(struct obj_section));
|
---|
783 | }
|
---|
784 |
|
---|
785 | static struct obj_symbol *arch_new_symbol(void)
|
---|
786 | {
|
---|
787 | struct arch_symbol *sym;
|
---|
788 | sym = xzalloc(sizeof(*sym));
|
---|
789 | return &sym->root;
|
---|
790 | }
|
---|
791 |
|
---|
792 | static enum obj_reloc
|
---|
793 | arch_apply_relocation(struct obj_file *f,
|
---|
794 | struct obj_section *targsec,
|
---|
795 | /*struct obj_section *symsec,*/
|
---|
796 | struct obj_symbol *sym,
|
---|
797 | ElfW(RelM) *rel, ElfW(Addr) v)
|
---|
798 | {
|
---|
799 | #if defined(__arm__) || defined(__i386__) || defined(__mc68000__) \
|
---|
800 | || defined(__sh__) || defined(__s390__) || defined(__x86_64__) \
|
---|
801 | || defined(__powerpc__) || defined(__mips__)
|
---|
802 | struct arch_file *ifile = (struct arch_file *) f;
|
---|
803 | #endif
|
---|
804 | enum obj_reloc ret = obj_reloc_ok;
|
---|
805 | ElfW(Addr) *loc = (ElfW(Addr) *) (targsec->contents + rel->r_offset);
|
---|
806 | #if defined(__arm__) || defined(__H8300H__) || defined(__H8300S__) \
|
---|
807 | || defined(__i386__) || defined(__mc68000__) || defined(__microblaze__) \
|
---|
808 | || defined(__mips__) || defined(__nios2__) || defined(__powerpc__) \
|
---|
809 | || defined(__s390__) || defined(__sh__) || defined(__x86_64__)
|
---|
810 | ElfW(Addr) dot = targsec->header.sh_addr + rel->r_offset;
|
---|
811 | #endif
|
---|
812 | #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
|
---|
813 | struct arch_symbol *isym = (struct arch_symbol *) sym;
|
---|
814 | #endif
|
---|
815 | #if defined(__arm__) || defined(__i386__) || defined(__mc68000__) \
|
---|
816 | || defined(__sh__) || defined(__s390__)
|
---|
817 | #if defined(USE_GOT_ENTRIES)
|
---|
818 | ElfW(Addr) got = ifile->got ? ifile->got->header.sh_addr : 0;
|
---|
819 | #endif
|
---|
820 | #endif
|
---|
821 | #if defined(USE_PLT_ENTRIES)
|
---|
822 | ElfW(Addr) plt = ifile->plt ? ifile->plt->header.sh_addr : 0;
|
---|
823 | unsigned long *ip;
|
---|
824 | # if defined(USE_PLT_LIST)
|
---|
825 | struct arch_list_entry *pe;
|
---|
826 | # else
|
---|
827 | struct arch_single_entry *pe;
|
---|
828 | # endif
|
---|
829 | #endif
|
---|
830 |
|
---|
831 | switch (ELF_R_TYPE(rel->r_info)) {
|
---|
832 |
|
---|
833 | #if defined(__arm__)
|
---|
834 |
|
---|
835 | case R_ARM_NONE:
|
---|
836 | break;
|
---|
837 |
|
---|
838 | case R_ARM_ABS32:
|
---|
839 | *loc += v;
|
---|
840 | break;
|
---|
841 |
|
---|
842 | case R_ARM_GOT32:
|
---|
843 | goto bb_use_got;
|
---|
844 |
|
---|
845 | case R_ARM_GOTPC:
|
---|
846 | /* relative reloc, always to _GLOBAL_OFFSET_TABLE_
|
---|
847 | * (which is .got) similar to branch,
|
---|
848 | * but is full 32 bits relative */
|
---|
849 |
|
---|
850 | *loc += got - dot;
|
---|
851 | break;
|
---|
852 |
|
---|
853 | case R_ARM_PC24:
|
---|
854 | case R_ARM_PLT32:
|
---|
855 | goto bb_use_plt;
|
---|
856 |
|
---|
857 | case R_ARM_GOTOFF: /* address relative to the got */
|
---|
858 | *loc += v - got;
|
---|
859 | break;
|
---|
860 |
|
---|
861 | #elif defined(__cris__)
|
---|
862 |
|
---|
863 | case R_CRIS_NONE:
|
---|
864 | break;
|
---|
865 |
|
---|
866 | case R_CRIS_32:
|
---|
867 | /* CRIS keeps the relocation value in the r_addend field and
|
---|
868 | * should not use whats in *loc at all
|
---|
869 | */
|
---|
870 | *loc = v;
|
---|
871 | break;
|
---|
872 |
|
---|
873 | #elif defined(__H8300H__) || defined(__H8300S__)
|
---|
874 |
|
---|
875 | case R_H8_DIR24R8:
|
---|
876 | loc = (ElfW(Addr) *)((ElfW(Addr))loc - 1);
|
---|
877 | *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
|
---|
878 | break;
|
---|
879 | case R_H8_DIR24A8:
|
---|
880 | *loc += v;
|
---|
881 | break;
|
---|
882 | case R_H8_DIR32:
|
---|
883 | case R_H8_DIR32A16:
|
---|
884 | *loc += v;
|
---|
885 | break;
|
---|
886 | case R_H8_PCREL16:
|
---|
887 | v -= dot + 2;
|
---|
888 | if ((ElfW(Sword))v > 0x7fff
|
---|
889 | || (ElfW(Sword))v < -(ElfW(Sword))0x8000
|
---|
890 | ) {
|
---|
891 | ret = obj_reloc_overflow;
|
---|
892 | } else {
|
---|
893 | *(unsigned short *)loc = v;
|
---|
894 | }
|
---|
895 | break;
|
---|
896 | case R_H8_PCREL8:
|
---|
897 | v -= dot + 1;
|
---|
898 | if ((ElfW(Sword))v > 0x7f
|
---|
899 | || (ElfW(Sword))v < -(ElfW(Sword))0x80
|
---|
900 | ) {
|
---|
901 | ret = obj_reloc_overflow;
|
---|
902 | } else {
|
---|
903 | *(unsigned char *)loc = v;
|
---|
904 | }
|
---|
905 | break;
|
---|
906 |
|
---|
907 | #elif defined(__i386__)
|
---|
908 |
|
---|
909 | case R_386_NONE:
|
---|
910 | break;
|
---|
911 |
|
---|
912 | case R_386_32:
|
---|
913 | *loc += v;
|
---|
914 | break;
|
---|
915 |
|
---|
916 | case R_386_PLT32:
|
---|
917 | case R_386_PC32:
|
---|
918 | case R_386_GOTOFF:
|
---|
919 | *loc += v - dot;
|
---|
920 | break;
|
---|
921 |
|
---|
922 | case R_386_GLOB_DAT:
|
---|
923 | case R_386_JMP_SLOT:
|
---|
924 | *loc = v;
|
---|
925 | break;
|
---|
926 |
|
---|
927 | case R_386_RELATIVE:
|
---|
928 | *loc += f->baseaddr;
|
---|
929 | break;
|
---|
930 |
|
---|
931 | case R_386_GOTPC:
|
---|
932 | *loc += got - dot;
|
---|
933 | break;
|
---|
934 |
|
---|
935 | case R_386_GOT32:
|
---|
936 | goto bb_use_got;
|
---|
937 | break;
|
---|
938 |
|
---|
939 | #elif defined(__microblaze__)
|
---|
940 | case R_MICROBLAZE_NONE:
|
---|
941 | case R_MICROBLAZE_64_NONE:
|
---|
942 | case R_MICROBLAZE_32_SYM_OP_SYM:
|
---|
943 | case R_MICROBLAZE_32_PCREL:
|
---|
944 | break;
|
---|
945 |
|
---|
946 | case R_MICROBLAZE_64_PCREL: {
|
---|
947 | /* dot is the address of the current instruction.
|
---|
948 | * v is the target symbol address.
|
---|
949 | * So we need to extract the offset in the code,
|
---|
950 | * adding v, then subtrating the current address
|
---|
951 | * of this instruction.
|
---|
952 | * Ex: "IMM 0xFFFE bralid 0x0000" = "bralid 0xFFFE0000"
|
---|
953 | */
|
---|
954 |
|
---|
955 | /* Get split offset stored in code */
|
---|
956 | unsigned int temp = (loc[0] & 0xFFFF) << 16 |
|
---|
957 | (loc[1] & 0xFFFF);
|
---|
958 |
|
---|
959 | /* Adjust relative offset. -4 adjustment required
|
---|
960 | * because dot points to the IMM insn, but branch
|
---|
961 | * is computed relative to the branch instruction itself.
|
---|
962 | */
|
---|
963 | temp += v - dot - 4;
|
---|
964 |
|
---|
965 | /* Store back into code */
|
---|
966 | loc[0] = (loc[0] & 0xFFFF0000) | temp >> 16;
|
---|
967 | loc[1] = (loc[1] & 0xFFFF0000) | (temp & 0xFFFF);
|
---|
968 |
|
---|
969 | break;
|
---|
970 | }
|
---|
971 |
|
---|
972 | case R_MICROBLAZE_32:
|
---|
973 | *loc += v;
|
---|
974 | break;
|
---|
975 |
|
---|
976 | case R_MICROBLAZE_64: {
|
---|
977 | /* Get split pointer stored in code */
|
---|
978 | unsigned int temp1 = (loc[0] & 0xFFFF) << 16 |
|
---|
979 | (loc[1] & 0xFFFF);
|
---|
980 |
|
---|
981 | /* Add reloc offset */
|
---|
982 | temp1+=v;
|
---|
983 |
|
---|
984 | /* Store back into code */
|
---|
985 | loc[0] = (loc[0] & 0xFFFF0000) | temp1 >> 16;
|
---|
986 | loc[1] = (loc[1] & 0xFFFF0000) | (temp1 & 0xFFFF);
|
---|
987 |
|
---|
988 | break;
|
---|
989 | }
|
---|
990 |
|
---|
991 | case R_MICROBLAZE_32_PCREL_LO:
|
---|
992 | case R_MICROBLAZE_32_LO:
|
---|
993 | case R_MICROBLAZE_SRO32:
|
---|
994 | case R_MICROBLAZE_SRW32:
|
---|
995 | ret = obj_reloc_unhandled;
|
---|
996 | break;
|
---|
997 |
|
---|
998 | #elif defined(__mc68000__)
|
---|
999 |
|
---|
1000 | case R_68K_NONE:
|
---|
1001 | break;
|
---|
1002 |
|
---|
1003 | case R_68K_32:
|
---|
1004 | *loc += v;
|
---|
1005 | break;
|
---|
1006 |
|
---|
1007 | case R_68K_8:
|
---|
1008 | if (v > 0xff) {
|
---|
1009 | ret = obj_reloc_overflow;
|
---|
1010 | }
|
---|
1011 | *(char *)loc = v;
|
---|
1012 | break;
|
---|
1013 |
|
---|
1014 | case R_68K_16:
|
---|
1015 | if (v > 0xffff) {
|
---|
1016 | ret = obj_reloc_overflow;
|
---|
1017 | }
|
---|
1018 | *(short *)loc = v;
|
---|
1019 | break;
|
---|
1020 |
|
---|
1021 | case R_68K_PC8:
|
---|
1022 | v -= dot;
|
---|
1023 | if ((ElfW(Sword))v > 0x7f
|
---|
1024 | || (ElfW(Sword))v < -(ElfW(Sword))0x80
|
---|
1025 | ) {
|
---|
1026 | ret = obj_reloc_overflow;
|
---|
1027 | }
|
---|
1028 | *(char *)loc = v;
|
---|
1029 | break;
|
---|
1030 |
|
---|
1031 | case R_68K_PC16:
|
---|
1032 | v -= dot;
|
---|
1033 | if ((ElfW(Sword))v > 0x7fff
|
---|
1034 | || (ElfW(Sword))v < -(ElfW(Sword))0x8000
|
---|
1035 | ) {
|
---|
1036 | ret = obj_reloc_overflow;
|
---|
1037 | }
|
---|
1038 | *(short *)loc = v;
|
---|
1039 | break;
|
---|
1040 |
|
---|
1041 | case R_68K_PC32:
|
---|
1042 | *(int *)loc = v - dot;
|
---|
1043 | break;
|
---|
1044 |
|
---|
1045 | case R_68K_GLOB_DAT:
|
---|
1046 | case R_68K_JMP_SLOT:
|
---|
1047 | *loc = v;
|
---|
1048 | break;
|
---|
1049 |
|
---|
1050 | case R_68K_RELATIVE:
|
---|
1051 | *(int *)loc += f->baseaddr;
|
---|
1052 | break;
|
---|
1053 |
|
---|
1054 | case R_68K_GOT32:
|
---|
1055 | goto bb_use_got;
|
---|
1056 |
|
---|
1057 | # ifdef R_68K_GOTOFF
|
---|
1058 | case R_68K_GOTOFF:
|
---|
1059 | *loc += v - got;
|
---|
1060 | break;
|
---|
1061 | # endif
|
---|
1062 |
|
---|
1063 | #elif defined(__mips__)
|
---|
1064 |
|
---|
1065 | case R_MIPS_NONE:
|
---|
1066 | break;
|
---|
1067 |
|
---|
1068 | case R_MIPS_32:
|
---|
1069 | *loc += v;
|
---|
1070 | break;
|
---|
1071 |
|
---|
1072 | case R_MIPS_26:
|
---|
1073 | if (v % 4)
|
---|
1074 | ret = obj_reloc_dangerous;
|
---|
1075 | if ((v & 0xf0000000) != ((dot + 4) & 0xf0000000))
|
---|
1076 | ret = obj_reloc_overflow;
|
---|
1077 | *loc =
|
---|
1078 | (*loc & ~0x03ffffff) | ((*loc + (v >> 2)) &
|
---|
1079 | 0x03ffffff);
|
---|
1080 | break;
|
---|
1081 |
|
---|
1082 | case R_MIPS_HI16:
|
---|
1083 | {
|
---|
1084 | struct mips_hi16 *n;
|
---|
1085 |
|
---|
1086 | /* We cannot relocate this one now because we don't know the value
|
---|
1087 | of the carry we need to add. Save the information, and let LO16
|
---|
1088 | do the actual relocation. */
|
---|
1089 | n = xmalloc(sizeof *n);
|
---|
1090 | n->addr = loc;
|
---|
1091 | n->value = v;
|
---|
1092 | n->next = ifile->mips_hi16_list;
|
---|
1093 | ifile->mips_hi16_list = n;
|
---|
1094 | break;
|
---|
1095 | }
|
---|
1096 |
|
---|
1097 | case R_MIPS_LO16:
|
---|
1098 | {
|
---|
1099 | unsigned long insnlo = *loc;
|
---|
1100 | ElfW(Addr) val, vallo;
|
---|
1101 |
|
---|
1102 | /* Sign extend the addend we extract from the lo insn. */
|
---|
1103 | vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
|
---|
1104 |
|
---|
1105 | if (ifile->mips_hi16_list != NULL) {
|
---|
1106 | struct mips_hi16 *l;
|
---|
1107 |
|
---|
1108 | l = ifile->mips_hi16_list;
|
---|
1109 | while (l != NULL) {
|
---|
1110 | struct mips_hi16 *next;
|
---|
1111 | unsigned long insn;
|
---|
1112 |
|
---|
1113 | /* Do the HI16 relocation. Note that we actually don't
|
---|
1114 | need to know anything about the LO16 itself, except where
|
---|
1115 | to find the low 16 bits of the addend needed by the LO16. */
|
---|
1116 | insn = *l->addr;
|
---|
1117 | val =
|
---|
1118 | ((insn & 0xffff) << 16) +
|
---|
1119 | vallo;
|
---|
1120 | val += v;
|
---|
1121 |
|
---|
1122 | /* Account for the sign extension that will happen in the
|
---|
1123 | low bits. */
|
---|
1124 | val =
|
---|
1125 | ((val >> 16) +
|
---|
1126 | ((val & 0x8000) !=
|
---|
1127 | 0)) & 0xffff;
|
---|
1128 |
|
---|
1129 | insn = (insn & ~0xffff) | val;
|
---|
1130 | *l->addr = insn;
|
---|
1131 |
|
---|
1132 | next = l->next;
|
---|
1133 | free(l);
|
---|
1134 | l = next;
|
---|
1135 | }
|
---|
1136 |
|
---|
1137 | ifile->mips_hi16_list = NULL;
|
---|
1138 | }
|
---|
1139 |
|
---|
1140 | /* Ok, we're done with the HI16 relocs. Now deal with the LO16. */
|
---|
1141 | val = v + vallo;
|
---|
1142 | insnlo = (insnlo & ~0xffff) | (val & 0xffff);
|
---|
1143 | *loc = insnlo;
|
---|
1144 | break;
|
---|
1145 | }
|
---|
1146 |
|
---|
1147 | #elif defined(__nios2__)
|
---|
1148 |
|
---|
1149 | case R_NIOS2_NONE:
|
---|
1150 | break;
|
---|
1151 |
|
---|
1152 | case R_NIOS2_BFD_RELOC_32:
|
---|
1153 | *loc += v;
|
---|
1154 | break;
|
---|
1155 |
|
---|
1156 | case R_NIOS2_BFD_RELOC_16:
|
---|
1157 | if (v > 0xffff) {
|
---|
1158 | ret = obj_reloc_overflow;
|
---|
1159 | }
|
---|
1160 | *(short *)loc = v;
|
---|
1161 | break;
|
---|
1162 |
|
---|
1163 | case R_NIOS2_BFD_RELOC_8:
|
---|
1164 | if (v > 0xff) {
|
---|
1165 | ret = obj_reloc_overflow;
|
---|
1166 | }
|
---|
1167 | *(char *)loc = v;
|
---|
1168 | break;
|
---|
1169 |
|
---|
1170 | case R_NIOS2_S16:
|
---|
1171 | {
|
---|
1172 | Elf32_Addr word;
|
---|
1173 |
|
---|
1174 | if ((Elf32_Sword)v > 0x7fff
|
---|
1175 | || (Elf32_Sword)v < -(Elf32_Sword)0x8000
|
---|
1176 | ) {
|
---|
1177 | ret = obj_reloc_overflow;
|
---|
1178 | }
|
---|
1179 |
|
---|
1180 | word = *loc;
|
---|
1181 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
|
---|
1182 | (word & 0x3f);
|
---|
1183 | }
|
---|
1184 | break;
|
---|
1185 |
|
---|
1186 | case R_NIOS2_U16:
|
---|
1187 | {
|
---|
1188 | Elf32_Addr word;
|
---|
1189 |
|
---|
1190 | if (v > 0xffff) {
|
---|
1191 | ret = obj_reloc_overflow;
|
---|
1192 | }
|
---|
1193 |
|
---|
1194 | word = *loc;
|
---|
1195 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
|
---|
1196 | (word & 0x3f);
|
---|
1197 | }
|
---|
1198 | break;
|
---|
1199 |
|
---|
1200 | case R_NIOS2_PCREL16:
|
---|
1201 | {
|
---|
1202 | Elf32_Addr word;
|
---|
1203 |
|
---|
1204 | v -= dot + 4;
|
---|
1205 | if ((Elf32_Sword)v > 0x7fff
|
---|
1206 | || (Elf32_Sword)v < -(Elf32_Sword)0x8000
|
---|
1207 | ) {
|
---|
1208 | ret = obj_reloc_overflow;
|
---|
1209 | }
|
---|
1210 |
|
---|
1211 | word = *loc;
|
---|
1212 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | (word & 0x3f);
|
---|
1213 | }
|
---|
1214 | break;
|
---|
1215 |
|
---|
1216 | case R_NIOS2_GPREL:
|
---|
1217 | {
|
---|
1218 | Elf32_Addr word, gp;
|
---|
1219 | /* get _gp */
|
---|
1220 | gp = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "_gp"));
|
---|
1221 | v -= gp;
|
---|
1222 | if ((Elf32_Sword)v > 0x7fff
|
---|
1223 | || (Elf32_Sword)v < -(Elf32_Sword)0x8000
|
---|
1224 | ) {
|
---|
1225 | ret = obj_reloc_overflow;
|
---|
1226 | }
|
---|
1227 |
|
---|
1228 | word = *loc;
|
---|
1229 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) | (word & 0x3f);
|
---|
1230 | }
|
---|
1231 | break;
|
---|
1232 |
|
---|
1233 | case R_NIOS2_CALL26:
|
---|
1234 | if (v & 3)
|
---|
1235 | ret = obj_reloc_dangerous;
|
---|
1236 | if ((v >> 28) != (dot >> 28))
|
---|
1237 | ret = obj_reloc_overflow;
|
---|
1238 | *loc = (*loc & 0x3f) | ((v >> 2) << 6);
|
---|
1239 | break;
|
---|
1240 |
|
---|
1241 | case R_NIOS2_IMM5:
|
---|
1242 | {
|
---|
1243 | Elf32_Addr word;
|
---|
1244 |
|
---|
1245 | if (v > 0x1f) {
|
---|
1246 | ret = obj_reloc_overflow;
|
---|
1247 | }
|
---|
1248 |
|
---|
1249 | word = *loc & ~0x7c0;
|
---|
1250 | *loc = word | ((v & 0x1f) << 6);
|
---|
1251 | }
|
---|
1252 | break;
|
---|
1253 |
|
---|
1254 | case R_NIOS2_IMM6:
|
---|
1255 | {
|
---|
1256 | Elf32_Addr word;
|
---|
1257 |
|
---|
1258 | if (v > 0x3f) {
|
---|
1259 | ret = obj_reloc_overflow;
|
---|
1260 | }
|
---|
1261 |
|
---|
1262 | word = *loc & ~0xfc0;
|
---|
1263 | *loc = word | ((v & 0x3f) << 6);
|
---|
1264 | }
|
---|
1265 | break;
|
---|
1266 |
|
---|
1267 | case R_NIOS2_IMM8:
|
---|
1268 | {
|
---|
1269 | Elf32_Addr word;
|
---|
1270 |
|
---|
1271 | if (v > 0xff) {
|
---|
1272 | ret = obj_reloc_overflow;
|
---|
1273 | }
|
---|
1274 |
|
---|
1275 | word = *loc & ~0x3fc0;
|
---|
1276 | *loc = word | ((v & 0xff) << 6);
|
---|
1277 | }
|
---|
1278 | break;
|
---|
1279 |
|
---|
1280 | case R_NIOS2_HI16:
|
---|
1281 | {
|
---|
1282 | Elf32_Addr word;
|
---|
1283 |
|
---|
1284 | word = *loc;
|
---|
1285 | *loc = ((((word >> 22) << 16) | ((v >>16) & 0xffff)) << 6) |
|
---|
1286 | (word & 0x3f);
|
---|
1287 | }
|
---|
1288 | break;
|
---|
1289 |
|
---|
1290 | case R_NIOS2_LO16:
|
---|
1291 | {
|
---|
1292 | Elf32_Addr word;
|
---|
1293 |
|
---|
1294 | word = *loc;
|
---|
1295 | *loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |
|
---|
1296 | (word & 0x3f);
|
---|
1297 | }
|
---|
1298 | break;
|
---|
1299 |
|
---|
1300 | case R_NIOS2_HIADJ16:
|
---|
1301 | {
|
---|
1302 | Elf32_Addr word1, word2;
|
---|
1303 |
|
---|
1304 | word1 = *loc;
|
---|
1305 | word2 = ((v >> 16) + ((v >> 15) & 1)) & 0xffff;
|
---|
1306 | *loc = ((((word1 >> 22) << 16) | word2) << 6) |
|
---|
1307 | (word1 & 0x3f);
|
---|
1308 | }
|
---|
1309 | break;
|
---|
1310 |
|
---|
1311 | #elif defined(__powerpc64__)
|
---|
1312 | /* PPC64 needs a 2.6 kernel, 2.4 module relocation irrelevant */
|
---|
1313 |
|
---|
1314 | #elif defined(__powerpc__)
|
---|
1315 |
|
---|
1316 | case R_PPC_ADDR16_HA:
|
---|
1317 | *(unsigned short *)loc = (v + 0x8000) >> 16;
|
---|
1318 | break;
|
---|
1319 |
|
---|
1320 | case R_PPC_ADDR16_HI:
|
---|
1321 | *(unsigned short *)loc = v >> 16;
|
---|
1322 | break;
|
---|
1323 |
|
---|
1324 | case R_PPC_ADDR16_LO:
|
---|
1325 | *(unsigned short *)loc = v;
|
---|
1326 | break;
|
---|
1327 |
|
---|
1328 | case R_PPC_REL24:
|
---|
1329 | goto bb_use_plt;
|
---|
1330 |
|
---|
1331 | case R_PPC_REL32:
|
---|
1332 | *loc = v - dot;
|
---|
1333 | break;
|
---|
1334 |
|
---|
1335 | case R_PPC_ADDR32:
|
---|
1336 | *loc = v;
|
---|
1337 | break;
|
---|
1338 |
|
---|
1339 | #elif defined(__s390__)
|
---|
1340 |
|
---|
1341 | case R_390_32:
|
---|
1342 | *(unsigned int *) loc += v;
|
---|
1343 | break;
|
---|
1344 | case R_390_16:
|
---|
1345 | *(unsigned short *) loc += v;
|
---|
1346 | break;
|
---|
1347 | case R_390_8:
|
---|
1348 | *(unsigned char *) loc += v;
|
---|
1349 | break;
|
---|
1350 |
|
---|
1351 | case R_390_PC32:
|
---|
1352 | *(unsigned int *) loc += v - dot;
|
---|
1353 | break;
|
---|
1354 | case R_390_PC16DBL:
|
---|
1355 | *(unsigned short *) loc += (v - dot) >> 1;
|
---|
1356 | break;
|
---|
1357 | case R_390_PC16:
|
---|
1358 | *(unsigned short *) loc += v - dot;
|
---|
1359 | break;
|
---|
1360 |
|
---|
1361 | case R_390_PLT32:
|
---|
1362 | case R_390_PLT16DBL:
|
---|
1363 | /* find the plt entry and initialize it. */
|
---|
1364 | pe = (struct arch_single_entry *) &isym->pltent;
|
---|
1365 | if (pe->inited == 0) {
|
---|
1366 | ip = (unsigned long *)(ifile->plt->contents + pe->offset);
|
---|
1367 | ip[0] = 0x0d105810; /* basr 1,0; lg 1,10(1); br 1 */
|
---|
1368 | ip[1] = 0x100607f1;
|
---|
1369 | if (ELF_R_TYPE(rel->r_info) == R_390_PLT16DBL)
|
---|
1370 | ip[2] = v - 2;
|
---|
1371 | else
|
---|
1372 | ip[2] = v;
|
---|
1373 | pe->inited = 1;
|
---|
1374 | }
|
---|
1375 |
|
---|
1376 | /* Insert relative distance to target. */
|
---|
1377 | v = plt + pe->offset - dot;
|
---|
1378 | if (ELF_R_TYPE(rel->r_info) == R_390_PLT32)
|
---|
1379 | *(unsigned int *) loc = (unsigned int) v;
|
---|
1380 | else if (ELF_R_TYPE(rel->r_info) == R_390_PLT16DBL)
|
---|
1381 | *(unsigned short *) loc = (unsigned short) ((v + 2) >> 1);
|
---|
1382 | break;
|
---|
1383 |
|
---|
1384 | case R_390_GLOB_DAT:
|
---|
1385 | case R_390_JMP_SLOT:
|
---|
1386 | *loc = v;
|
---|
1387 | break;
|
---|
1388 |
|
---|
1389 | case R_390_RELATIVE:
|
---|
1390 | *loc += f->baseaddr;
|
---|
1391 | break;
|
---|
1392 |
|
---|
1393 | case R_390_GOTPC:
|
---|
1394 | *(unsigned long *) loc += got - dot;
|
---|
1395 | break;
|
---|
1396 |
|
---|
1397 | case R_390_GOT12:
|
---|
1398 | case R_390_GOT16:
|
---|
1399 | case R_390_GOT32:
|
---|
1400 | if (!isym->gotent.inited)
|
---|
1401 | {
|
---|
1402 | isym->gotent.inited = 1;
|
---|
1403 | *(ElfW(Addr) *)(ifile->got->contents + isym->gotent.offset) = v;
|
---|
1404 | }
|
---|
1405 | if (ELF_R_TYPE(rel->r_info) == R_390_GOT12)
|
---|
1406 | *(unsigned short *) loc |= (*(unsigned short *) loc + isym->gotent.offset) & 0xfff;
|
---|
1407 | else if (ELF_R_TYPE(rel->r_info) == R_390_GOT16)
|
---|
1408 | *(unsigned short *) loc += isym->gotent.offset;
|
---|
1409 | else if (ELF_R_TYPE(rel->r_info) == R_390_GOT32)
|
---|
1410 | *(unsigned int *) loc += isym->gotent.offset;
|
---|
1411 | break;
|
---|
1412 |
|
---|
1413 | # ifndef R_390_GOTOFF32
|
---|
1414 | # define R_390_GOTOFF32 R_390_GOTOFF
|
---|
1415 | # endif
|
---|
1416 | case R_390_GOTOFF32:
|
---|
1417 | *loc += v - got;
|
---|
1418 | break;
|
---|
1419 |
|
---|
1420 | #elif defined(__sh__)
|
---|
1421 |
|
---|
1422 | case R_SH_NONE:
|
---|
1423 | break;
|
---|
1424 |
|
---|
1425 | case R_SH_DIR32:
|
---|
1426 | *loc += v;
|
---|
1427 | break;
|
---|
1428 |
|
---|
1429 | case R_SH_REL32:
|
---|
1430 | *loc += v - dot;
|
---|
1431 | break;
|
---|
1432 |
|
---|
1433 | case R_SH_PLT32:
|
---|
1434 | *loc = v - dot;
|
---|
1435 | break;
|
---|
1436 |
|
---|
1437 | case R_SH_GLOB_DAT:
|
---|
1438 | case R_SH_JMP_SLOT:
|
---|
1439 | *loc = v;
|
---|
1440 | break;
|
---|
1441 |
|
---|
1442 | case R_SH_RELATIVE:
|
---|
1443 | *loc = f->baseaddr + rel->r_addend;
|
---|
1444 | break;
|
---|
1445 |
|
---|
1446 | case R_SH_GOTPC:
|
---|
1447 | *loc = got - dot + rel->r_addend;
|
---|
1448 | break;
|
---|
1449 |
|
---|
1450 | case R_SH_GOT32:
|
---|
1451 | goto bb_use_got;
|
---|
1452 |
|
---|
1453 | case R_SH_GOTOFF:
|
---|
1454 | *loc = v - got;
|
---|
1455 | break;
|
---|
1456 |
|
---|
1457 | # if defined(__SH5__)
|
---|
1458 | case R_SH_IMM_MEDLOW16:
|
---|
1459 | case R_SH_IMM_LOW16:
|
---|
1460 | {
|
---|
1461 | ElfW(Addr) word;
|
---|
1462 |
|
---|
1463 | if (ELF_R_TYPE(rel->r_info) == R_SH_IMM_MEDLOW16)
|
---|
1464 | v >>= 16;
|
---|
1465 |
|
---|
1466 | /*
|
---|
1467 | * movi and shori have the format:
|
---|
1468 | *
|
---|
1469 | * | op | imm | reg | reserved |
|
---|
1470 | * 31..26 25..10 9.. 4 3 .. 0
|
---|
1471 | *
|
---|
1472 | * so we simply mask and or in imm.
|
---|
1473 | */
|
---|
1474 | word = *loc & ~0x3fffc00;
|
---|
1475 | word |= (v & 0xffff) << 10;
|
---|
1476 |
|
---|
1477 | *loc = word;
|
---|
1478 |
|
---|
1479 | break;
|
---|
1480 | }
|
---|
1481 |
|
---|
1482 | case R_SH_IMM_MEDLOW16_PCREL:
|
---|
1483 | case R_SH_IMM_LOW16_PCREL:
|
---|
1484 | {
|
---|
1485 | ElfW(Addr) word;
|
---|
1486 |
|
---|
1487 | word = *loc & ~0x3fffc00;
|
---|
1488 |
|
---|
1489 | v -= dot;
|
---|
1490 |
|
---|
1491 | if (ELF_R_TYPE(rel->r_info) == R_SH_IMM_MEDLOW16_PCREL)
|
---|
1492 | v >>= 16;
|
---|
1493 |
|
---|
1494 | word |= (v & 0xffff) << 10;
|
---|
1495 |
|
---|
1496 | *loc = word;
|
---|
1497 |
|
---|
1498 | break;
|
---|
1499 | }
|
---|
1500 | # endif /* __SH5__ */
|
---|
1501 |
|
---|
1502 | #elif defined(__v850e__)
|
---|
1503 |
|
---|
1504 | case R_V850_NONE:
|
---|
1505 | break;
|
---|
1506 |
|
---|
1507 | case R_V850_32:
|
---|
1508 | /* We write two shorts instead of a long because even
|
---|
1509 | 32-bit insns only need half-word alignment, but
|
---|
1510 | 32-bit data needs to be long-word aligned. */
|
---|
1511 | v += ((unsigned short *)loc)[0];
|
---|
1512 | v += ((unsigned short *)loc)[1] << 16;
|
---|
1513 | ((unsigned short *)loc)[0] = v & 0xffff;
|
---|
1514 | ((unsigned short *)loc)[1] = (v >> 16) & 0xffff;
|
---|
1515 | break;
|
---|
1516 |
|
---|
1517 | case R_V850_22_PCREL:
|
---|
1518 | goto bb_use_plt;
|
---|
1519 |
|
---|
1520 | #elif defined(__x86_64__)
|
---|
1521 |
|
---|
1522 | case R_X86_64_NONE:
|
---|
1523 | break;
|
---|
1524 |
|
---|
1525 | case R_X86_64_64:
|
---|
1526 | *loc += v;
|
---|
1527 | break;
|
---|
1528 |
|
---|
1529 | case R_X86_64_32:
|
---|
1530 | *(unsigned int *) loc += v;
|
---|
1531 | if (v > 0xffffffff)
|
---|
1532 | {
|
---|
1533 | ret = obj_reloc_overflow; /* Kernel module compiled without -mcmodel=kernel. */
|
---|
1534 | /* error("Possibly is module compiled without -mcmodel=kernel!"); */
|
---|
1535 | }
|
---|
1536 | break;
|
---|
1537 |
|
---|
1538 | case R_X86_64_32S:
|
---|
1539 | *(signed int *) loc += v;
|
---|
1540 | break;
|
---|
1541 |
|
---|
1542 | case R_X86_64_16:
|
---|
1543 | *(unsigned short *) loc += v;
|
---|
1544 | break;
|
---|
1545 |
|
---|
1546 | case R_X86_64_8:
|
---|
1547 | *(unsigned char *) loc += v;
|
---|
1548 | break;
|
---|
1549 |
|
---|
1550 | case R_X86_64_PC32:
|
---|
1551 | *(unsigned int *) loc += v - dot;
|
---|
1552 | break;
|
---|
1553 |
|
---|
1554 | case R_X86_64_PC16:
|
---|
1555 | *(unsigned short *) loc += v - dot;
|
---|
1556 | break;
|
---|
1557 |
|
---|
1558 | case R_X86_64_PC8:
|
---|
1559 | *(unsigned char *) loc += v - dot;
|
---|
1560 | break;
|
---|
1561 |
|
---|
1562 | case R_X86_64_GLOB_DAT:
|
---|
1563 | case R_X86_64_JUMP_SLOT:
|
---|
1564 | *loc = v;
|
---|
1565 | break;
|
---|
1566 |
|
---|
1567 | case R_X86_64_RELATIVE:
|
---|
1568 | *loc += f->baseaddr;
|
---|
1569 | break;
|
---|
1570 |
|
---|
1571 | case R_X86_64_GOT32:
|
---|
1572 | case R_X86_64_GOTPCREL:
|
---|
1573 | goto bb_use_got;
|
---|
1574 | # if 0
|
---|
1575 | if (!isym->gotent.reloc_done)
|
---|
1576 | {
|
---|
1577 | isym->gotent.reloc_done = 1;
|
---|
1578 | *(Elf64_Addr *)(ifile->got->contents + isym->gotent.offset) = v;
|
---|
1579 | }
|
---|
1580 | /* XXX are these really correct? */
|
---|
1581 | if (ELF64_R_TYPE(rel->r_info) == R_X86_64_GOTPCREL)
|
---|
1582 | *(unsigned int *) loc += v + isym->gotent.offset;
|
---|
1583 | else
|
---|
1584 | *loc += isym->gotent.offset;
|
---|
1585 | break;
|
---|
1586 | # endif
|
---|
1587 |
|
---|
1588 | #else
|
---|
1589 | # warning "no idea how to handle relocations on your arch"
|
---|
1590 | #endif
|
---|
1591 |
|
---|
1592 | default:
|
---|
1593 | printf("Warning: unhandled reloc %d\n", (int)ELF_R_TYPE(rel->r_info));
|
---|
1594 | ret = obj_reloc_unhandled;
|
---|
1595 | break;
|
---|
1596 |
|
---|
1597 | #if defined(USE_PLT_ENTRIES)
|
---|
1598 |
|
---|
1599 | bb_use_plt:
|
---|
1600 |
|
---|
1601 | /* find the plt entry and initialize it if necessary */
|
---|
1602 |
|
---|
1603 | #if defined(USE_PLT_LIST)
|
---|
1604 | for (pe = isym->pltent; pe != NULL && pe->addend != rel->r_addend;)
|
---|
1605 | pe = pe->next;
|
---|
1606 | #else
|
---|
1607 | pe = &isym->pltent;
|
---|
1608 | #endif
|
---|
1609 |
|
---|
1610 | if (! pe->inited) {
|
---|
1611 | ip = (unsigned long *) (ifile->plt->contents + pe->offset);
|
---|
1612 |
|
---|
1613 | /* generate some machine code */
|
---|
1614 |
|
---|
1615 | #if defined(__arm__)
|
---|
1616 | ip[0] = 0xe51ff004; /* ldr pc,[pc,#-4] */
|
---|
1617 | ip[1] = v; /* sym@ */
|
---|
1618 | #endif
|
---|
1619 | #if defined(__powerpc__)
|
---|
1620 | ip[0] = 0x3d600000 + ((v + 0x8000) >> 16); /* lis r11,sym@ha */
|
---|
1621 | ip[1] = 0x396b0000 + (v & 0xffff); /* addi r11,r11,sym@l */
|
---|
1622 | ip[2] = 0x7d6903a6; /* mtctr r11 */
|
---|
1623 | ip[3] = 0x4e800420; /* bctr */
|
---|
1624 | #endif
|
---|
1625 | #if defined(__v850e__)
|
---|
1626 | /* We have to trash a register, so we assume that any control
|
---|
1627 | transfer more than 21-bits away must be a function call
|
---|
1628 | (so we can use a call-clobbered register). */
|
---|
1629 | ip[0] = 0x0621 + ((v & 0xffff) << 16); /* mov sym, r1 ... */
|
---|
1630 | ip[1] = ((v >> 16) & 0xffff) + 0x610000; /* ...; jmp r1 */
|
---|
1631 | #endif
|
---|
1632 | pe->inited = 1;
|
---|
1633 | }
|
---|
1634 |
|
---|
1635 | /* relative distance to target */
|
---|
1636 | v -= dot;
|
---|
1637 | /* if the target is too far away.... */
|
---|
1638 | #if defined(__arm__) || defined(__powerpc__)
|
---|
1639 | if ((int)v < -0x02000000 || (int)v >= 0x02000000)
|
---|
1640 | #elif defined(__v850e__)
|
---|
1641 | if ((ElfW(Sword))v > 0x1fffff || (ElfW(Sword))v < (ElfW(Sword))-0x200000)
|
---|
1642 | #endif
|
---|
1643 | /* go via the plt */
|
---|
1644 | v = plt + pe->offset - dot;
|
---|
1645 |
|
---|
1646 | #if defined(__v850e__)
|
---|
1647 | if (v & 1)
|
---|
1648 | #else
|
---|
1649 | if (v & 3)
|
---|
1650 | #endif
|
---|
1651 | ret = obj_reloc_dangerous;
|
---|
1652 |
|
---|
1653 | /* merge the offset into the instruction. */
|
---|
1654 | #if defined(__arm__)
|
---|
1655 | /* Convert to words. */
|
---|
1656 | v >>= 2;
|
---|
1657 |
|
---|
1658 | *loc = (*loc & ~0x00ffffff) | ((v + *loc) & 0x00ffffff);
|
---|
1659 | #endif
|
---|
1660 | #if defined(__powerpc__)
|
---|
1661 | *loc = (*loc & ~0x03fffffc) | (v & 0x03fffffc);
|
---|
1662 | #endif
|
---|
1663 | #if defined(__v850e__)
|
---|
1664 | /* We write two shorts instead of a long because even 32-bit insns
|
---|
1665 | only need half-word alignment, but the 32-bit data write needs
|
---|
1666 | to be long-word aligned. */
|
---|
1667 | ((unsigned short *)loc)[0] =
|
---|
1668 | (*(unsigned short *)loc & 0xffc0) /* opcode + reg */
|
---|
1669 | | ((v >> 16) & 0x3f); /* offs high part */
|
---|
1670 | ((unsigned short *)loc)[1] =
|
---|
1671 | (v & 0xffff); /* offs low part */
|
---|
1672 | #endif
|
---|
1673 | break;
|
---|
1674 | #endif /* USE_PLT_ENTRIES */
|
---|
1675 |
|
---|
1676 | #if defined(USE_GOT_ENTRIES)
|
---|
1677 | bb_use_got:
|
---|
1678 |
|
---|
1679 | /* needs an entry in the .got: set it, once */
|
---|
1680 | if (!isym->gotent.inited) {
|
---|
1681 | isym->gotent.inited = 1;
|
---|
1682 | *(ElfW(Addr) *) (ifile->got->contents + isym->gotent.offset) = v;
|
---|
1683 | }
|
---|
1684 | /* make the reloc with_respect_to_.got */
|
---|
1685 | #if defined(__sh__)
|
---|
1686 | *loc += isym->gotent.offset + rel->r_addend;
|
---|
1687 | #elif defined(__i386__) || defined(__arm__) || defined(__mc68000__)
|
---|
1688 | *loc += isym->gotent.offset;
|
---|
1689 | #endif
|
---|
1690 | break;
|
---|
1691 |
|
---|
1692 | #endif /* USE_GOT_ENTRIES */
|
---|
1693 | }
|
---|
1694 |
|
---|
1695 | return ret;
|
---|
1696 | }
|
---|
1697 |
|
---|
1698 |
|
---|
1699 | #if defined(USE_LIST)
|
---|
1700 |
|
---|
1701 | static int arch_list_add(ElfW(RelM) *rel, struct arch_list_entry **list,
|
---|
1702 | int offset, int size)
|
---|
1703 | {
|
---|
1704 | struct arch_list_entry *pe;
|
---|
1705 |
|
---|
1706 | for (pe = *list; pe != NULL; pe = pe->next) {
|
---|
1707 | if (pe->addend == rel->r_addend) {
|
---|
1708 | break;
|
---|
1709 | }
|
---|
1710 | }
|
---|
1711 |
|
---|
1712 | if (pe == NULL) {
|
---|
1713 | pe = xzalloc(sizeof(struct arch_list_entry));
|
---|
1714 | pe->next = *list;
|
---|
1715 | pe->addend = rel->r_addend;
|
---|
1716 | pe->offset = offset;
|
---|
1717 | /*pe->inited = 0;*/
|
---|
1718 | *list = pe;
|
---|
1719 | return size;
|
---|
1720 | }
|
---|
1721 | return 0;
|
---|
1722 | }
|
---|
1723 |
|
---|
1724 | #endif
|
---|
1725 |
|
---|
1726 | #if defined(USE_SINGLE)
|
---|
1727 |
|
---|
1728 | static int arch_single_init(/*ElfW(RelM) *rel,*/ struct arch_single_entry *single,
|
---|
1729 | int offset, int size)
|
---|
1730 | {
|
---|
1731 | if (single->allocated == 0) {
|
---|
1732 | single->allocated = 1;
|
---|
1733 | single->offset = offset;
|
---|
1734 | single->inited = 0;
|
---|
1735 | return size;
|
---|
1736 | }
|
---|
1737 | return 0;
|
---|
1738 | }
|
---|
1739 |
|
---|
1740 | #endif
|
---|
1741 |
|
---|
1742 | #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
|
---|
1743 |
|
---|
1744 | static struct obj_section *arch_xsect_init(struct obj_file *f, const char *name,
|
---|
1745 | int offset, int size)
|
---|
1746 | {
|
---|
1747 | struct obj_section *myrelsec = obj_find_section(f, name);
|
---|
1748 |
|
---|
1749 | if (offset == 0) {
|
---|
1750 | offset += size;
|
---|
1751 | }
|
---|
1752 |
|
---|
1753 | if (myrelsec) {
|
---|
1754 | obj_extend_section(myrelsec, offset);
|
---|
1755 | } else {
|
---|
1756 | myrelsec = obj_create_alloced_section(f, name,
|
---|
1757 | size, offset);
|
---|
1758 | }
|
---|
1759 |
|
---|
1760 | return myrelsec;
|
---|
1761 | }
|
---|
1762 |
|
---|
1763 | #endif
|
---|
1764 |
|
---|
1765 | static void arch_create_got(struct obj_file *f)
|
---|
1766 | {
|
---|
1767 | #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
|
---|
1768 | struct arch_file *ifile = (struct arch_file *) f;
|
---|
1769 | int i;
|
---|
1770 | #if defined(USE_GOT_ENTRIES)
|
---|
1771 | int got_offset = 0, got_needed = 0, got_allocate;
|
---|
1772 | #endif
|
---|
1773 | #if defined(USE_PLT_ENTRIES)
|
---|
1774 | int plt_offset = 0, plt_needed = 0, plt_allocate;
|
---|
1775 | #endif
|
---|
1776 | struct obj_section *relsec, *symsec, *strsec;
|
---|
1777 | ElfW(RelM) *rel, *relend;
|
---|
1778 | ElfW(Sym) *symtab, *extsym;
|
---|
1779 | const char *strtab, *name;
|
---|
1780 | struct arch_symbol *intsym;
|
---|
1781 |
|
---|
1782 | for (i = 0; i < f->header.e_shnum; ++i) {
|
---|
1783 | relsec = f->sections[i];
|
---|
1784 | if (relsec->header.sh_type != SHT_RELM)
|
---|
1785 | continue;
|
---|
1786 |
|
---|
1787 | symsec = f->sections[relsec->header.sh_link];
|
---|
1788 | strsec = f->sections[symsec->header.sh_link];
|
---|
1789 |
|
---|
1790 | rel = (ElfW(RelM) *) relsec->contents;
|
---|
1791 | relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM)));
|
---|
1792 | symtab = (ElfW(Sym) *) symsec->contents;
|
---|
1793 | strtab = (const char *) strsec->contents;
|
---|
1794 |
|
---|
1795 | for (; rel < relend; ++rel) {
|
---|
1796 | extsym = &symtab[ELF_R_SYM(rel->r_info)];
|
---|
1797 |
|
---|
1798 | #if defined(USE_GOT_ENTRIES)
|
---|
1799 | got_allocate = 0;
|
---|
1800 | #endif
|
---|
1801 | #if defined(USE_PLT_ENTRIES)
|
---|
1802 | plt_allocate = 0;
|
---|
1803 | #endif
|
---|
1804 |
|
---|
1805 | switch (ELF_R_TYPE(rel->r_info)) {
|
---|
1806 | #if defined(__arm__)
|
---|
1807 | case R_ARM_PC24:
|
---|
1808 | case R_ARM_PLT32:
|
---|
1809 | plt_allocate = 1;
|
---|
1810 | break;
|
---|
1811 |
|
---|
1812 | case R_ARM_GOTOFF:
|
---|
1813 | case R_ARM_GOTPC:
|
---|
1814 | got_needed = 1;
|
---|
1815 | continue;
|
---|
1816 |
|
---|
1817 | case R_ARM_GOT32:
|
---|
1818 | got_allocate = 1;
|
---|
1819 | break;
|
---|
1820 |
|
---|
1821 | #elif defined(__i386__)
|
---|
1822 | case R_386_GOTPC:
|
---|
1823 | case R_386_GOTOFF:
|
---|
1824 | got_needed = 1;
|
---|
1825 | continue;
|
---|
1826 |
|
---|
1827 | case R_386_GOT32:
|
---|
1828 | got_allocate = 1;
|
---|
1829 | break;
|
---|
1830 |
|
---|
1831 | #elif defined(__powerpc__)
|
---|
1832 | case R_PPC_REL24:
|
---|
1833 | plt_allocate = 1;
|
---|
1834 | break;
|
---|
1835 |
|
---|
1836 | #elif defined(__mc68000__)
|
---|
1837 | case R_68K_GOT32:
|
---|
1838 | got_allocate = 1;
|
---|
1839 | break;
|
---|
1840 |
|
---|
1841 | #ifdef R_68K_GOTOFF
|
---|
1842 | case R_68K_GOTOFF:
|
---|
1843 | got_needed = 1;
|
---|
1844 | continue;
|
---|
1845 | #endif
|
---|
1846 |
|
---|
1847 | #elif defined(__sh__)
|
---|
1848 | case R_SH_GOT32:
|
---|
1849 | got_allocate = 1;
|
---|
1850 | break;
|
---|
1851 |
|
---|
1852 | case R_SH_GOTPC:
|
---|
1853 | case R_SH_GOTOFF:
|
---|
1854 | got_needed = 1;
|
---|
1855 | continue;
|
---|
1856 |
|
---|
1857 | #elif defined(__v850e__)
|
---|
1858 | case R_V850_22_PCREL:
|
---|
1859 | plt_needed = 1;
|
---|
1860 | break;
|
---|
1861 |
|
---|
1862 | #endif
|
---|
1863 | default:
|
---|
1864 | continue;
|
---|
1865 | }
|
---|
1866 |
|
---|
1867 | if (extsym->st_name != 0) {
|
---|
1868 | name = strtab + extsym->st_name;
|
---|
1869 | } else {
|
---|
1870 | name = f->sections[extsym->st_shndx]->name;
|
---|
1871 | }
|
---|
1872 | intsym = (struct arch_symbol *) obj_find_symbol(f, name);
|
---|
1873 | #if defined(USE_GOT_ENTRIES)
|
---|
1874 | if (got_allocate) {
|
---|
1875 | got_offset += arch_single_init(
|
---|
1876 | /*rel,*/ &intsym->gotent,
|
---|
1877 | got_offset, GOT_ENTRY_SIZE);
|
---|
1878 |
|
---|
1879 | got_needed = 1;
|
---|
1880 | }
|
---|
1881 | #endif
|
---|
1882 | #if defined(USE_PLT_ENTRIES)
|
---|
1883 | if (plt_allocate) {
|
---|
1884 | #if defined(USE_PLT_LIST)
|
---|
1885 | plt_offset += arch_list_add(
|
---|
1886 | rel, &intsym->pltent,
|
---|
1887 | plt_offset, PLT_ENTRY_SIZE);
|
---|
1888 | #else
|
---|
1889 | plt_offset += arch_single_init(
|
---|
1890 | /*rel,*/ &intsym->pltent,
|
---|
1891 | plt_offset, PLT_ENTRY_SIZE);
|
---|
1892 | #endif
|
---|
1893 | plt_needed = 1;
|
---|
1894 | }
|
---|
1895 | #endif
|
---|
1896 | }
|
---|
1897 | }
|
---|
1898 |
|
---|
1899 | #if defined(USE_GOT_ENTRIES)
|
---|
1900 | if (got_needed) {
|
---|
1901 | ifile->got = arch_xsect_init(f, ".got", got_offset,
|
---|
1902 | GOT_ENTRY_SIZE);
|
---|
1903 | }
|
---|
1904 | #endif
|
---|
1905 |
|
---|
1906 | #if defined(USE_PLT_ENTRIES)
|
---|
1907 | if (plt_needed) {
|
---|
1908 | ifile->plt = arch_xsect_init(f, ".plt", plt_offset,
|
---|
1909 | PLT_ENTRY_SIZE);
|
---|
1910 | }
|
---|
1911 | #endif
|
---|
1912 |
|
---|
1913 | #endif /* defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES) */
|
---|
1914 | }
|
---|
1915 |
|
---|
1916 | /*======================================================================*/
|
---|
1917 |
|
---|
1918 | /* Standard ELF hash function. */
|
---|
1919 | static unsigned long obj_elf_hash_n(const char *name, unsigned long n)
|
---|
1920 | {
|
---|
1921 | unsigned long h = 0;
|
---|
1922 | unsigned long g;
|
---|
1923 | unsigned char ch;
|
---|
1924 |
|
---|
1925 | while (n > 0) {
|
---|
1926 | ch = *name++;
|
---|
1927 | h = (h << 4) + ch;
|
---|
1928 | g = (h & 0xf0000000);
|
---|
1929 | if (g != 0) {
|
---|
1930 | h ^= g >> 24;
|
---|
1931 | h &= ~g;
|
---|
1932 | }
|
---|
1933 | n--;
|
---|
1934 | }
|
---|
1935 | return h;
|
---|
1936 | }
|
---|
1937 |
|
---|
1938 | static unsigned long FAST_FUNC obj_elf_hash(const char *name)
|
---|
1939 | {
|
---|
1940 | return obj_elf_hash_n(name, strlen(name));
|
---|
1941 | }
|
---|
1942 |
|
---|
1943 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
1944 | /* String comparison for non-co-versioned kernel and module. */
|
---|
1945 |
|
---|
1946 | static int ncv_strcmp(const char *a, const char *b)
|
---|
1947 | {
|
---|
1948 | size_t alen = strlen(a), blen = strlen(b);
|
---|
1949 |
|
---|
1950 | if (blen == alen + 10 && b[alen] == '_' && b[alen + 1] == 'R')
|
---|
1951 | return strncmp(a, b, alen);
|
---|
1952 | else if (alen == blen + 10 && a[blen] == '_' && a[blen + 1] == 'R')
|
---|
1953 | return strncmp(a, b, blen);
|
---|
1954 | else
|
---|
1955 | return strcmp(a, b);
|
---|
1956 | }
|
---|
1957 |
|
---|
1958 | /* String hashing for non-co-versioned kernel and module. Here
|
---|
1959 | we are simply forced to drop the crc from the hash. */
|
---|
1960 |
|
---|
1961 | static unsigned long FAST_FUNC ncv_symbol_hash(const char *str)
|
---|
1962 | {
|
---|
1963 | size_t len = strlen(str);
|
---|
1964 | if (len > 10 && str[len - 10] == '_' && str[len - 9] == 'R')
|
---|
1965 | len -= 10;
|
---|
1966 | return obj_elf_hash_n(str, len);
|
---|
1967 | }
|
---|
1968 |
|
---|
1969 | static void
|
---|
1970 | obj_set_symbol_compare(struct obj_file *f,
|
---|
1971 | int (*cmp) (const char *, const char *),
|
---|
1972 | unsigned long (*hash) (const char *) FAST_FUNC)
|
---|
1973 | {
|
---|
1974 | if (cmp)
|
---|
1975 | f->symbol_cmp = cmp;
|
---|
1976 | if (hash) {
|
---|
1977 | struct obj_symbol *tmptab[HASH_BUCKETS], *sym, *next;
|
---|
1978 | int i;
|
---|
1979 |
|
---|
1980 | f->symbol_hash = hash;
|
---|
1981 |
|
---|
1982 | memcpy(tmptab, f->symtab, sizeof(tmptab));
|
---|
1983 | memset(f->symtab, 0, sizeof(f->symtab));
|
---|
1984 |
|
---|
1985 | for (i = 0; i < HASH_BUCKETS; ++i) {
|
---|
1986 | for (sym = tmptab[i]; sym; sym = next) {
|
---|
1987 | unsigned long h = hash(sym->name) % HASH_BUCKETS;
|
---|
1988 | next = sym->next;
|
---|
1989 | sym->next = f->symtab[h];
|
---|
1990 | f->symtab[h] = sym;
|
---|
1991 | }
|
---|
1992 | }
|
---|
1993 | }
|
---|
1994 | }
|
---|
1995 |
|
---|
1996 | #endif /* FEATURE_INSMOD_VERSION_CHECKING */
|
---|
1997 |
|
---|
1998 | static struct obj_symbol *
|
---|
1999 | obj_add_symbol(struct obj_file *f, const char *name,
|
---|
2000 | unsigned long symidx, int info,
|
---|
2001 | int secidx, ElfW(Addr) value,
|
---|
2002 | unsigned long size)
|
---|
2003 | {
|
---|
2004 | struct obj_symbol *sym;
|
---|
2005 | unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
|
---|
2006 | int n_type = ELF_ST_TYPE(info);
|
---|
2007 | int n_binding = ELF_ST_BIND(info);
|
---|
2008 |
|
---|
2009 | for (sym = f->symtab[hash]; sym; sym = sym->next) {
|
---|
2010 | if (f->symbol_cmp(sym->name, name) == 0) {
|
---|
2011 | int o_secidx = sym->secidx;
|
---|
2012 | int o_info = sym->info;
|
---|
2013 | int o_type = ELF_ST_TYPE(o_info);
|
---|
2014 | int o_binding = ELF_ST_BIND(o_info);
|
---|
2015 |
|
---|
2016 | /* A redefinition! Is it legal? */
|
---|
2017 |
|
---|
2018 | if (secidx == SHN_UNDEF)
|
---|
2019 | return sym;
|
---|
2020 | else if (o_secidx == SHN_UNDEF)
|
---|
2021 | goto found;
|
---|
2022 | else if (n_binding == STB_GLOBAL && o_binding == STB_LOCAL) {
|
---|
2023 | /* Cope with local and global symbols of the same name
|
---|
2024 | in the same object file, as might have been created
|
---|
2025 | by ld -r. The only reason locals are now seen at this
|
---|
2026 | level at all is so that we can do semi-sensible things
|
---|
2027 | with parameters. */
|
---|
2028 |
|
---|
2029 | struct obj_symbol *nsym, **p;
|
---|
2030 |
|
---|
2031 | nsym = arch_new_symbol();
|
---|
2032 | nsym->next = sym->next;
|
---|
2033 | nsym->ksymidx = -1;
|
---|
2034 |
|
---|
2035 | /* Excise the old (local) symbol from the hash chain. */
|
---|
2036 | for (p = &f->symtab[hash]; *p != sym; p = &(*p)->next)
|
---|
2037 | continue;
|
---|
2038 | *p = sym = nsym;
|
---|
2039 | goto found;
|
---|
2040 | } else if (n_binding == STB_LOCAL) {
|
---|
2041 | /* Another symbol of the same name has already been defined.
|
---|
2042 | Just add this to the local table. */
|
---|
2043 | sym = arch_new_symbol();
|
---|
2044 | sym->next = NULL;
|
---|
2045 | sym->ksymidx = -1;
|
---|
2046 | f->local_symtab[symidx] = sym;
|
---|
2047 | goto found;
|
---|
2048 | } else if (n_binding == STB_WEAK)
|
---|
2049 | return sym;
|
---|
2050 | else if (o_binding == STB_WEAK)
|
---|
2051 | goto found;
|
---|
2052 | /* Don't unify COMMON symbols with object types the programmer
|
---|
2053 | doesn't expect. */
|
---|
2054 | else if (secidx == SHN_COMMON
|
---|
2055 | && (o_type == STT_NOTYPE || o_type == STT_OBJECT))
|
---|
2056 | return sym;
|
---|
2057 | else if (o_secidx == SHN_COMMON
|
---|
2058 | && (n_type == STT_NOTYPE || n_type == STT_OBJECT))
|
---|
2059 | goto found;
|
---|
2060 | else {
|
---|
2061 | /* Don't report an error if the symbol is coming from
|
---|
2062 | the kernel or some external module. */
|
---|
2063 | if (secidx <= SHN_HIRESERVE)
|
---|
2064 | bb_error_msg("%s multiply defined", name);
|
---|
2065 | return sym;
|
---|
2066 | }
|
---|
2067 | }
|
---|
2068 | }
|
---|
2069 |
|
---|
2070 | /* Completely new symbol. */
|
---|
2071 | sym = arch_new_symbol();
|
---|
2072 | sym->next = f->symtab[hash];
|
---|
2073 | f->symtab[hash] = sym;
|
---|
2074 | sym->ksymidx = -1;
|
---|
2075 | if (ELF_ST_BIND(info) == STB_LOCAL && symidx != (unsigned long)(-1)) {
|
---|
2076 | if (symidx >= f->local_symtab_size)
|
---|
2077 | bb_error_msg("local symbol %s with index %ld exceeds local_symtab_size %ld",
|
---|
2078 | name, (long) symidx, (long) f->local_symtab_size);
|
---|
2079 | else
|
---|
2080 | f->local_symtab[symidx] = sym;
|
---|
2081 | }
|
---|
2082 |
|
---|
2083 | found:
|
---|
2084 | sym->name = name;
|
---|
2085 | sym->value = value;
|
---|
2086 | sym->size = size;
|
---|
2087 | sym->secidx = secidx;
|
---|
2088 | sym->info = info;
|
---|
2089 |
|
---|
2090 | return sym;
|
---|
2091 | }
|
---|
2092 |
|
---|
2093 | static struct obj_symbol *
|
---|
2094 | obj_find_symbol(struct obj_file *f, const char *name)
|
---|
2095 | {
|
---|
2096 | struct obj_symbol *sym;
|
---|
2097 | unsigned long hash = f->symbol_hash(name) % HASH_BUCKETS;
|
---|
2098 |
|
---|
2099 | for (sym = f->symtab[hash]; sym; sym = sym->next)
|
---|
2100 | if (f->symbol_cmp(sym->name, name) == 0)
|
---|
2101 | return sym;
|
---|
2102 | return NULL;
|
---|
2103 | }
|
---|
2104 |
|
---|
2105 | static ElfW(Addr) obj_symbol_final_value(struct obj_file * f, struct obj_symbol * sym)
|
---|
2106 | {
|
---|
2107 | if (sym) {
|
---|
2108 | if (sym->secidx >= SHN_LORESERVE)
|
---|
2109 | return sym->value;
|
---|
2110 | return sym->value + f->sections[sym->secidx]->header.sh_addr;
|
---|
2111 | }
|
---|
2112 | /* As a special case, a NULL sym has value zero. */
|
---|
2113 | return 0;
|
---|
2114 | }
|
---|
2115 |
|
---|
2116 | static struct obj_section *obj_find_section(struct obj_file *f, const char *name)
|
---|
2117 | {
|
---|
2118 | int i, n = f->header.e_shnum;
|
---|
2119 |
|
---|
2120 | for (i = 0; i < n; ++i)
|
---|
2121 | if (strcmp(f->sections[i]->name, name) == 0)
|
---|
2122 | return f->sections[i];
|
---|
2123 | return NULL;
|
---|
2124 | }
|
---|
2125 |
|
---|
2126 | static int obj_load_order_prio(struct obj_section *a)
|
---|
2127 | {
|
---|
2128 | unsigned long af, ac;
|
---|
2129 |
|
---|
2130 | af = a->header.sh_flags;
|
---|
2131 |
|
---|
2132 | ac = 0;
|
---|
2133 | if (a->name[0] != '.' || strlen(a->name) != 10
|
---|
2134 | || strcmp(a->name + 5, ".init") != 0
|
---|
2135 | ) {
|
---|
2136 | ac |= 32;
|
---|
2137 | }
|
---|
2138 | if (af & SHF_ALLOC)
|
---|
2139 | ac |= 16;
|
---|
2140 | if (!(af & SHF_WRITE))
|
---|
2141 | ac |= 8;
|
---|
2142 | if (af & SHF_EXECINSTR)
|
---|
2143 | ac |= 4;
|
---|
2144 | if (a->header.sh_type != SHT_NOBITS)
|
---|
2145 | ac |= 2;
|
---|
2146 |
|
---|
2147 | return ac;
|
---|
2148 | }
|
---|
2149 |
|
---|
2150 | static void
|
---|
2151 | obj_insert_section_load_order(struct obj_file *f, struct obj_section *sec)
|
---|
2152 | {
|
---|
2153 | struct obj_section **p;
|
---|
2154 | int prio = obj_load_order_prio(sec);
|
---|
2155 | for (p = f->load_order_search_start; *p; p = &(*p)->load_next)
|
---|
2156 | if (obj_load_order_prio(*p) < prio)
|
---|
2157 | break;
|
---|
2158 | sec->load_next = *p;
|
---|
2159 | *p = sec;
|
---|
2160 | }
|
---|
2161 |
|
---|
2162 | static struct obj_section *helper_create_alloced_section(struct obj_file *f,
|
---|
2163 | const char *name,
|
---|
2164 | unsigned long align,
|
---|
2165 | unsigned long size)
|
---|
2166 | {
|
---|
2167 | int newidx = f->header.e_shnum++;
|
---|
2168 | struct obj_section *sec;
|
---|
2169 |
|
---|
2170 | f->sections = xrealloc_vector(f->sections, 2, newidx);
|
---|
2171 | f->sections[newidx] = sec = arch_new_section();
|
---|
2172 |
|
---|
2173 | sec->header.sh_type = SHT_PROGBITS;
|
---|
2174 | sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
|
---|
2175 | sec->header.sh_size = size;
|
---|
2176 | sec->header.sh_addralign = align;
|
---|
2177 | sec->name = name;
|
---|
2178 | sec->idx = newidx;
|
---|
2179 | if (size)
|
---|
2180 | sec->contents = xzalloc(size);
|
---|
2181 |
|
---|
2182 | return sec;
|
---|
2183 | }
|
---|
2184 |
|
---|
2185 | static struct obj_section *obj_create_alloced_section(struct obj_file *f,
|
---|
2186 | const char *name,
|
---|
2187 | unsigned long align,
|
---|
2188 | unsigned long size)
|
---|
2189 | {
|
---|
2190 | struct obj_section *sec;
|
---|
2191 |
|
---|
2192 | sec = helper_create_alloced_section(f, name, align, size);
|
---|
2193 | obj_insert_section_load_order(f, sec);
|
---|
2194 | return sec;
|
---|
2195 | }
|
---|
2196 |
|
---|
2197 | static struct obj_section *obj_create_alloced_section_first(struct obj_file *f,
|
---|
2198 | const char *name,
|
---|
2199 | unsigned long align,
|
---|
2200 | unsigned long size)
|
---|
2201 | {
|
---|
2202 | struct obj_section *sec;
|
---|
2203 |
|
---|
2204 | sec = helper_create_alloced_section(f, name, align, size);
|
---|
2205 | sec->load_next = f->load_order;
|
---|
2206 | f->load_order = sec;
|
---|
2207 | if (f->load_order_search_start == &f->load_order)
|
---|
2208 | f->load_order_search_start = &sec->load_next;
|
---|
2209 |
|
---|
2210 | return sec;
|
---|
2211 | }
|
---|
2212 |
|
---|
2213 | static void *obj_extend_section(struct obj_section *sec, unsigned long more)
|
---|
2214 | {
|
---|
2215 | unsigned long oldsize = sec->header.sh_size;
|
---|
2216 | if (more) {
|
---|
2217 | sec->header.sh_size += more;
|
---|
2218 | sec->contents = xrealloc(sec->contents, sec->header.sh_size);
|
---|
2219 | }
|
---|
2220 | return sec->contents + oldsize;
|
---|
2221 | }
|
---|
2222 |
|
---|
2223 |
|
---|
2224 | /* Conditionally add the symbols from the given symbol set to the
|
---|
2225 | new module. */
|
---|
2226 |
|
---|
2227 | static int add_symbols_from(struct obj_file *f,
|
---|
2228 | int idx,
|
---|
2229 | struct new_module_symbol *syms,
|
---|
2230 | size_t nsyms)
|
---|
2231 | {
|
---|
2232 | struct new_module_symbol *s;
|
---|
2233 | size_t i;
|
---|
2234 | int used = 0;
|
---|
2235 | #ifdef SYMBOL_PREFIX
|
---|
2236 | char *name_buf = NULL;
|
---|
2237 | size_t name_alloced_size = 0;
|
---|
2238 | #endif
|
---|
2239 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
|
---|
2240 | int gpl;
|
---|
2241 |
|
---|
2242 | gpl = obj_gpl_license(f, NULL) == 0;
|
---|
2243 | #endif
|
---|
2244 | for (i = 0, s = syms; i < nsyms; ++i, ++s) {
|
---|
2245 | /* Only add symbols that are already marked external.
|
---|
2246 | If we override locals we may cause problems for
|
---|
2247 | argument initialization. We will also create a false
|
---|
2248 | dependency on the module. */
|
---|
2249 | struct obj_symbol *sym;
|
---|
2250 | char *name;
|
---|
2251 |
|
---|
2252 | /* GPL licensed modules can use symbols exported with
|
---|
2253 | * EXPORT_SYMBOL_GPL, so ignore any GPLONLY_ prefix on the
|
---|
2254 | * exported names. Non-GPL modules never see any GPLONLY_
|
---|
2255 | * symbols so they cannot fudge it by adding the prefix on
|
---|
2256 | * their references.
|
---|
2257 | */
|
---|
2258 | if (strncmp((char *)s->name, "GPLONLY_", 8) == 0) {
|
---|
2259 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
|
---|
2260 | if (gpl)
|
---|
2261 | s->name += 8;
|
---|
2262 | else
|
---|
2263 | #endif
|
---|
2264 | continue;
|
---|
2265 | }
|
---|
2266 | name = (char *)s->name;
|
---|
2267 |
|
---|
2268 | #ifdef SYMBOL_PREFIX
|
---|
2269 | /* Prepend SYMBOL_PREFIX to the symbol's name (the
|
---|
2270 | kernel exports `C names', but module object files
|
---|
2271 | reference `linker names'). */
|
---|
2272 | size_t extra = sizeof SYMBOL_PREFIX;
|
---|
2273 | size_t name_size = strlen(name) + extra;
|
---|
2274 | if (name_size > name_alloced_size) {
|
---|
2275 | name_alloced_size = name_size * 2;
|
---|
2276 | name_buf = alloca(name_alloced_size);
|
---|
2277 | }
|
---|
2278 | strcpy(name_buf, SYMBOL_PREFIX);
|
---|
2279 | strcpy(name_buf + extra - 1, name);
|
---|
2280 | name = name_buf;
|
---|
2281 | #endif
|
---|
2282 |
|
---|
2283 | sym = obj_find_symbol(f, name);
|
---|
2284 | if (sym && !(ELF_ST_BIND(sym->info) == STB_LOCAL)) {
|
---|
2285 | #ifdef SYMBOL_PREFIX
|
---|
2286 | /* Put NAME_BUF into more permanent storage. */
|
---|
2287 | name = xmalloc(name_size);
|
---|
2288 | strcpy(name, name_buf);
|
---|
2289 | #endif
|
---|
2290 | sym = obj_add_symbol(f, name, -1,
|
---|
2291 | ELF_ST_INFO(STB_GLOBAL,
|
---|
2292 | STT_NOTYPE),
|
---|
2293 | idx, s->value, 0);
|
---|
2294 | /* Did our symbol just get installed? If so, mark the
|
---|
2295 | module as "used". */
|
---|
2296 | if (sym->secidx == idx)
|
---|
2297 | used = 1;
|
---|
2298 | }
|
---|
2299 | }
|
---|
2300 |
|
---|
2301 | return used;
|
---|
2302 | }
|
---|
2303 |
|
---|
2304 | static void add_kernel_symbols(struct obj_file *f)
|
---|
2305 | {
|
---|
2306 | struct external_module *m;
|
---|
2307 | int i, nused = 0;
|
---|
2308 |
|
---|
2309 | /* Add module symbols first. */
|
---|
2310 |
|
---|
2311 | for (i = 0, m = ext_modules; i < n_ext_modules; ++i, ++m) {
|
---|
2312 | if (m->nsyms
|
---|
2313 | && add_symbols_from(f, SHN_HIRESERVE + 2 + i, m->syms, m->nsyms)
|
---|
2314 | ) {
|
---|
2315 | m->used = 1;
|
---|
2316 | ++nused;
|
---|
2317 | }
|
---|
2318 | }
|
---|
2319 |
|
---|
2320 | n_ext_modules_used = nused;
|
---|
2321 |
|
---|
2322 | /* And finally the symbols from the kernel proper. */
|
---|
2323 |
|
---|
2324 | if (nksyms)
|
---|
2325 | add_symbols_from(f, SHN_HIRESERVE + 1, ksyms, nksyms);
|
---|
2326 | }
|
---|
2327 |
|
---|
2328 | static char *get_modinfo_value(struct obj_file *f, const char *key)
|
---|
2329 | {
|
---|
2330 | struct obj_section *sec;
|
---|
2331 | char *p, *v, *n, *ep;
|
---|
2332 | size_t klen = strlen(key);
|
---|
2333 |
|
---|
2334 | sec = obj_find_section(f, ".modinfo");
|
---|
2335 | if (sec == NULL)
|
---|
2336 | return NULL;
|
---|
2337 | p = sec->contents;
|
---|
2338 | ep = p + sec->header.sh_size;
|
---|
2339 | while (p < ep) {
|
---|
2340 | v = strchr(p, '=');
|
---|
2341 | n = strchr(p, '\0');
|
---|
2342 | if (v) {
|
---|
2343 | if (p + klen == v && strncmp(p, key, klen) == 0)
|
---|
2344 | return v + 1;
|
---|
2345 | } else {
|
---|
2346 | if (p + klen == n && strcmp(p, key) == 0)
|
---|
2347 | return n;
|
---|
2348 | }
|
---|
2349 | p = n + 1;
|
---|
2350 | }
|
---|
2351 |
|
---|
2352 | return NULL;
|
---|
2353 | }
|
---|
2354 |
|
---|
2355 |
|
---|
2356 | /*======================================================================*/
|
---|
2357 | /* Functions relating to module loading after 2.1.18. */
|
---|
2358 |
|
---|
2359 | /* From Linux-2.6 sources */
|
---|
2360 | /* You can use " around spaces, but can't escape ". */
|
---|
2361 | /* Hyphens and underscores equivalent in parameter names. */
|
---|
2362 | static char *next_arg(char *args, char **param, char **val)
|
---|
2363 | {
|
---|
2364 | unsigned int i, equals = 0;
|
---|
2365 | int in_quote = 0, quoted = 0;
|
---|
2366 | char *next;
|
---|
2367 |
|
---|
2368 | if (*args == '"') {
|
---|
2369 | args++;
|
---|
2370 | in_quote = 1;
|
---|
2371 | quoted = 1;
|
---|
2372 | }
|
---|
2373 |
|
---|
2374 | for (i = 0; args[i]; i++) {
|
---|
2375 | if (args[i] == ' ' && !in_quote)
|
---|
2376 | break;
|
---|
2377 | if (equals == 0) {
|
---|
2378 | if (args[i] == '=')
|
---|
2379 | equals = i;
|
---|
2380 | }
|
---|
2381 | if (args[i] == '"')
|
---|
2382 | in_quote = !in_quote;
|
---|
2383 | }
|
---|
2384 |
|
---|
2385 | *param = args;
|
---|
2386 | if (!equals)
|
---|
2387 | *val = NULL;
|
---|
2388 | else {
|
---|
2389 | args[equals] = '\0';
|
---|
2390 | *val = args + equals + 1;
|
---|
2391 |
|
---|
2392 | /* Don't include quotes in value. */
|
---|
2393 | if (**val == '"') {
|
---|
2394 | (*val)++;
|
---|
2395 | if (args[i-1] == '"')
|
---|
2396 | args[i-1] = '\0';
|
---|
2397 | }
|
---|
2398 | if (quoted && args[i-1] == '"')
|
---|
2399 | args[i-1] = '\0';
|
---|
2400 | }
|
---|
2401 |
|
---|
2402 | if (args[i]) {
|
---|
2403 | args[i] = '\0';
|
---|
2404 | next = args + i + 1;
|
---|
2405 | } else
|
---|
2406 | next = args + i;
|
---|
2407 |
|
---|
2408 | /* Chew up trailing spaces. */
|
---|
2409 | return skip_whitespace(next);
|
---|
2410 | }
|
---|
2411 |
|
---|
2412 | static void
|
---|
2413 | new_process_module_arguments(struct obj_file *f, const char *options)
|
---|
2414 | {
|
---|
2415 | char *xoptions, *pos;
|
---|
2416 | char *param, *val;
|
---|
2417 |
|
---|
2418 | xoptions = pos = xstrdup(skip_whitespace(options));
|
---|
2419 | while (*pos) {
|
---|
2420 | unsigned long charssize = 0;
|
---|
2421 | char *tmp, *contents, *loc, *pinfo, *p;
|
---|
2422 | struct obj_symbol *sym;
|
---|
2423 | int min, max, n, len;
|
---|
2424 |
|
---|
2425 | pos = next_arg(pos, ¶m, &val);
|
---|
2426 |
|
---|
2427 | tmp = xasprintf("parm_%s", param);
|
---|
2428 | pinfo = get_modinfo_value(f, tmp);
|
---|
2429 | free(tmp);
|
---|
2430 | if (pinfo == NULL)
|
---|
2431 | bb_error_msg_and_die("invalid parameter %s", param);
|
---|
2432 |
|
---|
2433 | #ifdef SYMBOL_PREFIX
|
---|
2434 | tmp = xasprintf(SYMBOL_PREFIX "%s", param);
|
---|
2435 | sym = obj_find_symbol(f, tmp);
|
---|
2436 | free(tmp);
|
---|
2437 | #else
|
---|
2438 | sym = obj_find_symbol(f, param);
|
---|
2439 | #endif
|
---|
2440 |
|
---|
2441 | /* Also check that the parameter was not resolved from the kernel. */
|
---|
2442 | if (sym == NULL || sym->secidx > SHN_HIRESERVE)
|
---|
2443 | bb_error_msg_and_die("symbol for parameter %s not found", param);
|
---|
2444 |
|
---|
2445 | /* Number of parameters */
|
---|
2446 | min = max = 1;
|
---|
2447 | if (isdigit(*pinfo)) {
|
---|
2448 | min = max = strtoul(pinfo, &pinfo, 10);
|
---|
2449 | if (*pinfo == '-')
|
---|
2450 | max = strtoul(pinfo + 1, &pinfo, 10);
|
---|
2451 | }
|
---|
2452 |
|
---|
2453 | contents = f->sections[sym->secidx]->contents;
|
---|
2454 | loc = contents + sym->value;
|
---|
2455 |
|
---|
2456 | if (*pinfo == 'c') {
|
---|
2457 | if (!isdigit(pinfo[1])) {
|
---|
2458 | bb_error_msg_and_die("parameter type 'c' for %s must be followed by"
|
---|
2459 | " the maximum size", param);
|
---|
2460 | }
|
---|
2461 | charssize = strtoul(pinfo + 1, NULL, 10);
|
---|
2462 | }
|
---|
2463 |
|
---|
2464 | if (val == NULL) {
|
---|
2465 | if (*pinfo != 'b')
|
---|
2466 | bb_error_msg_and_die("argument expected for parameter %s", param);
|
---|
2467 | val = (char *) "1";
|
---|
2468 | }
|
---|
2469 |
|
---|
2470 | /* Parse parameter values */
|
---|
2471 | n = 0;
|
---|
2472 | p = val;
|
---|
2473 | while (*p) {
|
---|
2474 | char sv_ch;
|
---|
2475 | char *endp;
|
---|
2476 |
|
---|
2477 | if (++n > max)
|
---|
2478 | bb_error_msg_and_die("too many values for %s (max %d)", param, max);
|
---|
2479 |
|
---|
2480 | switch (*pinfo) {
|
---|
2481 | case 's':
|
---|
2482 | len = strcspn(p, ",");
|
---|
2483 | sv_ch = p[len];
|
---|
2484 | p[len] = '\0';
|
---|
2485 | obj_string_patch(f, sym->secidx,
|
---|
2486 | loc - contents, p);
|
---|
2487 | loc += tgt_sizeof_char_p;
|
---|
2488 | p += len;
|
---|
2489 | *p = sv_ch;
|
---|
2490 | break;
|
---|
2491 | case 'c':
|
---|
2492 | len = strcspn(p, ",");
|
---|
2493 | sv_ch = p[len];
|
---|
2494 | p[len] = '\0';
|
---|
2495 | if (len >= charssize)
|
---|
2496 | bb_error_msg_and_die("string too long for %s (max %ld)", param,
|
---|
2497 | charssize - 1);
|
---|
2498 | strcpy((char *) loc, p);
|
---|
2499 | loc += charssize;
|
---|
2500 | p += len;
|
---|
2501 | *p = sv_ch;
|
---|
2502 | break;
|
---|
2503 | case 'b':
|
---|
2504 | *loc++ = strtoul(p, &endp, 0);
|
---|
2505 | p = endp; /* gcc likes temp var for &endp */
|
---|
2506 | break;
|
---|
2507 | case 'h':
|
---|
2508 | *(short *) loc = strtoul(p, &endp, 0);
|
---|
2509 | loc += tgt_sizeof_short;
|
---|
2510 | p = endp;
|
---|
2511 | break;
|
---|
2512 | case 'i':
|
---|
2513 | *(int *) loc = strtoul(p, &endp, 0);
|
---|
2514 | loc += tgt_sizeof_int;
|
---|
2515 | p = endp;
|
---|
2516 | break;
|
---|
2517 | case 'l':
|
---|
2518 | *(long *) loc = strtoul(p, &endp, 0);
|
---|
2519 | loc += tgt_sizeof_long;
|
---|
2520 | p = endp;
|
---|
2521 | break;
|
---|
2522 | default:
|
---|
2523 | bb_error_msg_and_die("unknown parameter type '%c' for %s",
|
---|
2524 | *pinfo, param);
|
---|
2525 | }
|
---|
2526 |
|
---|
2527 | p = skip_whitespace(p);
|
---|
2528 | if (*p != ',')
|
---|
2529 | break;
|
---|
2530 | p = skip_whitespace(p + 1);
|
---|
2531 | }
|
---|
2532 |
|
---|
2533 | if (n < min)
|
---|
2534 | bb_error_msg_and_die("parameter %s requires at least %d arguments", param, min);
|
---|
2535 | if (*p != '\0')
|
---|
2536 | bb_error_msg_and_die("invalid argument syntax for %s", param);
|
---|
2537 | }
|
---|
2538 |
|
---|
2539 | free(xoptions);
|
---|
2540 | }
|
---|
2541 |
|
---|
2542 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
2543 | static int new_is_module_checksummed(struct obj_file *f)
|
---|
2544 | {
|
---|
2545 | const char *p = get_modinfo_value(f, "using_checksums");
|
---|
2546 | if (p)
|
---|
2547 | return xatoi(p);
|
---|
2548 | return 0;
|
---|
2549 | }
|
---|
2550 |
|
---|
2551 | /* Get the module's kernel version in the canonical integer form. */
|
---|
2552 |
|
---|
2553 | static int
|
---|
2554 | new_get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
|
---|
2555 | {
|
---|
2556 | char *p, *q;
|
---|
2557 | int a, b, c;
|
---|
2558 |
|
---|
2559 | p = get_modinfo_value(f, "kernel_version");
|
---|
2560 | if (p == NULL)
|
---|
2561 | return -1;
|
---|
2562 | safe_strncpy(str, p, STRVERSIONLEN);
|
---|
2563 |
|
---|
2564 | a = strtoul(p, &p, 10);
|
---|
2565 | if (*p != '.')
|
---|
2566 | return -1;
|
---|
2567 | b = strtoul(p + 1, &p, 10);
|
---|
2568 | if (*p != '.')
|
---|
2569 | return -1;
|
---|
2570 | c = strtoul(p + 1, &q, 10);
|
---|
2571 | if (p + 1 == q)
|
---|
2572 | return -1;
|
---|
2573 |
|
---|
2574 | return a << 16 | b << 8 | c;
|
---|
2575 | }
|
---|
2576 |
|
---|
2577 | #endif /* FEATURE_INSMOD_VERSION_CHECKING */
|
---|
2578 |
|
---|
2579 |
|
---|
2580 | /* Fetch the loaded modules, and all currently exported symbols. */
|
---|
2581 |
|
---|
2582 | static void new_get_kernel_symbols(void)
|
---|
2583 | {
|
---|
2584 | char *module_names, *mn;
|
---|
2585 | struct external_module *modules, *m;
|
---|
2586 | struct new_module_symbol *syms, *s;
|
---|
2587 | size_t ret, bufsize, nmod, nsyms, i, j;
|
---|
2588 |
|
---|
2589 | /* Collect the loaded modules. */
|
---|
2590 |
|
---|
2591 | bufsize = 256;
|
---|
2592 | module_names = xmalloc(bufsize);
|
---|
2593 |
|
---|
2594 | retry_modules_load:
|
---|
2595 | if (query_module(NULL, QM_MODULES, module_names, bufsize, &ret)) {
|
---|
2596 | if (errno == ENOSPC && bufsize < ret) {
|
---|
2597 | bufsize = ret;
|
---|
2598 | module_names = xrealloc(module_names, bufsize);
|
---|
2599 | goto retry_modules_load;
|
---|
2600 | }
|
---|
2601 | bb_perror_msg_and_die("QM_MODULES");
|
---|
2602 | }
|
---|
2603 |
|
---|
2604 | n_ext_modules = nmod = ret;
|
---|
2605 |
|
---|
2606 | /* Collect the modules' symbols. */
|
---|
2607 |
|
---|
2608 | if (nmod) {
|
---|
2609 | ext_modules = modules = xzalloc(nmod * sizeof(*modules));
|
---|
2610 | for (i = 0, mn = module_names, m = modules;
|
---|
2611 | i < nmod; ++i, ++m, mn += strlen(mn) + 1) {
|
---|
2612 | struct new_module_info info;
|
---|
2613 |
|
---|
2614 | if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) {
|
---|
2615 | if (errno == ENOENT) {
|
---|
2616 | /* The module was removed out from underneath us. */
|
---|
2617 | continue;
|
---|
2618 | }
|
---|
2619 | bb_perror_msg_and_die("query_module: QM_INFO: %s", mn);
|
---|
2620 | }
|
---|
2621 |
|
---|
2622 | bufsize = 1024;
|
---|
2623 | syms = xmalloc(bufsize);
|
---|
2624 | retry_mod_sym_load:
|
---|
2625 | if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) {
|
---|
2626 | switch (errno) {
|
---|
2627 | case ENOSPC:
|
---|
2628 | bufsize = ret;
|
---|
2629 | syms = xrealloc(syms, bufsize);
|
---|
2630 | goto retry_mod_sym_load;
|
---|
2631 | case ENOENT:
|
---|
2632 | /* The module was removed out from underneath us. */
|
---|
2633 | continue;
|
---|
2634 | default:
|
---|
2635 | bb_perror_msg_and_die("query_module: QM_SYMBOLS: %s", mn);
|
---|
2636 | }
|
---|
2637 | }
|
---|
2638 | nsyms = ret;
|
---|
2639 |
|
---|
2640 | m->name = mn;
|
---|
2641 | m->addr = info.addr;
|
---|
2642 | m->nsyms = nsyms;
|
---|
2643 | m->syms = syms;
|
---|
2644 |
|
---|
2645 | for (j = 0, s = syms; j < nsyms; ++j, ++s) {
|
---|
2646 | s->name += (unsigned long) syms;
|
---|
2647 | }
|
---|
2648 | }
|
---|
2649 | }
|
---|
2650 |
|
---|
2651 | /* Collect the kernel's symbols. */
|
---|
2652 |
|
---|
2653 | bufsize = 16 * 1024;
|
---|
2654 | syms = xmalloc(bufsize);
|
---|
2655 | retry_kern_sym_load:
|
---|
2656 | if (query_module(NULL, QM_SYMBOLS, syms, bufsize, &ret)) {
|
---|
2657 | if (errno == ENOSPC && bufsize < ret) {
|
---|
2658 | bufsize = ret;
|
---|
2659 | syms = xrealloc(syms, bufsize);
|
---|
2660 | goto retry_kern_sym_load;
|
---|
2661 | }
|
---|
2662 | bb_perror_msg_and_die("kernel: QM_SYMBOLS");
|
---|
2663 | }
|
---|
2664 | nksyms = nsyms = ret;
|
---|
2665 | ksyms = syms;
|
---|
2666 |
|
---|
2667 | for (j = 0, s = syms; j < nsyms; ++j, ++s) {
|
---|
2668 | s->name += (unsigned long) syms;
|
---|
2669 | }
|
---|
2670 | }
|
---|
2671 |
|
---|
2672 |
|
---|
2673 | /* Return the kernel symbol checksum version, or zero if not used. */
|
---|
2674 |
|
---|
2675 | static int new_is_kernel_checksummed(void)
|
---|
2676 | {
|
---|
2677 | struct new_module_symbol *s;
|
---|
2678 | size_t i;
|
---|
2679 |
|
---|
2680 | /* Using_Versions is not the first symbol, but it should be in there. */
|
---|
2681 |
|
---|
2682 | for (i = 0, s = ksyms; i < nksyms; ++i, ++s)
|
---|
2683 | if (strcmp((char *) s->name, "Using_Versions") == 0)
|
---|
2684 | return s->value;
|
---|
2685 |
|
---|
2686 | return 0;
|
---|
2687 | }
|
---|
2688 |
|
---|
2689 |
|
---|
2690 | static void new_create_this_module(struct obj_file *f, const char *m_name)
|
---|
2691 | {
|
---|
2692 | struct obj_section *sec;
|
---|
2693 |
|
---|
2694 | sec = obj_create_alloced_section_first(f, ".this", tgt_sizeof_long,
|
---|
2695 | sizeof(struct new_module));
|
---|
2696 | /* done by obj_create_alloced_section_first: */
|
---|
2697 | /*memset(sec->contents, 0, sizeof(struct new_module));*/
|
---|
2698 |
|
---|
2699 | obj_add_symbol(f, SPFX "__this_module", -1,
|
---|
2700 | ELF_ST_INFO(STB_LOCAL, STT_OBJECT), sec->idx, 0,
|
---|
2701 | sizeof(struct new_module));
|
---|
2702 |
|
---|
2703 | obj_string_patch(f, sec->idx, offsetof(struct new_module, name),
|
---|
2704 | m_name);
|
---|
2705 | }
|
---|
2706 |
|
---|
2707 | #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
|
---|
2708 | /* add an entry to the __ksymtab section, creating it if necessary */
|
---|
2709 | static void new_add_ksymtab(struct obj_file *f, struct obj_symbol *sym)
|
---|
2710 | {
|
---|
2711 | struct obj_section *sec;
|
---|
2712 | ElfW(Addr) ofs;
|
---|
2713 |
|
---|
2714 | /* ensure __ksymtab is allocated, EXPORT_NOSYMBOLS creates a non-alloc section.
|
---|
2715 | * If __ksymtab is defined but not marked alloc, x out the first character
|
---|
2716 | * (no obj_delete routine) and create a new __ksymtab with the correct
|
---|
2717 | * characteristics.
|
---|
2718 | */
|
---|
2719 | sec = obj_find_section(f, "__ksymtab");
|
---|
2720 | if (sec && !(sec->header.sh_flags & SHF_ALLOC)) {
|
---|
2721 | *((char *)(sec->name)) = 'x'; /* override const */
|
---|
2722 | sec = NULL;
|
---|
2723 | }
|
---|
2724 | if (!sec)
|
---|
2725 | sec = obj_create_alloced_section(f, "__ksymtab",
|
---|
2726 | tgt_sizeof_void_p, 0);
|
---|
2727 | if (!sec)
|
---|
2728 | return;
|
---|
2729 | sec->header.sh_flags |= SHF_ALLOC;
|
---|
2730 | /* Empty section might be byte-aligned */
|
---|
2731 | sec->header.sh_addralign = tgt_sizeof_void_p;
|
---|
2732 | ofs = sec->header.sh_size;
|
---|
2733 | obj_symbol_patch(f, sec->idx, ofs, sym);
|
---|
2734 | obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p, sym->name);
|
---|
2735 | obj_extend_section(sec, 2 * tgt_sizeof_char_p);
|
---|
2736 | }
|
---|
2737 | #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */
|
---|
2738 |
|
---|
2739 | static int new_create_module_ksymtab(struct obj_file *f)
|
---|
2740 | {
|
---|
2741 | struct obj_section *sec;
|
---|
2742 | int i;
|
---|
2743 |
|
---|
2744 | /* We must always add the module references. */
|
---|
2745 |
|
---|
2746 | if (n_ext_modules_used) {
|
---|
2747 | struct new_module_ref *dep;
|
---|
2748 | struct obj_symbol *tm;
|
---|
2749 |
|
---|
2750 | sec = obj_create_alloced_section(f, ".kmodtab", tgt_sizeof_void_p,
|
---|
2751 | (sizeof(struct new_module_ref)
|
---|
2752 | * n_ext_modules_used));
|
---|
2753 | if (!sec)
|
---|
2754 | return 0;
|
---|
2755 |
|
---|
2756 | tm = obj_find_symbol(f, SPFX "__this_module");
|
---|
2757 | dep = (struct new_module_ref *) sec->contents;
|
---|
2758 | for (i = 0; i < n_ext_modules; ++i)
|
---|
2759 | if (ext_modules[i].used) {
|
---|
2760 | dep->dep = ext_modules[i].addr;
|
---|
2761 | obj_symbol_patch(f, sec->idx,
|
---|
2762 | (char *) &dep->ref - sec->contents, tm);
|
---|
2763 | dep->next_ref = 0;
|
---|
2764 | ++dep;
|
---|
2765 | }
|
---|
2766 | }
|
---|
2767 |
|
---|
2768 | if (!flag_noexport && !obj_find_section(f, "__ksymtab")) {
|
---|
2769 | size_t nsyms;
|
---|
2770 | int *loaded;
|
---|
2771 |
|
---|
2772 | sec = obj_create_alloced_section(f, "__ksymtab", tgt_sizeof_void_p, 0);
|
---|
2773 |
|
---|
2774 | /* We don't want to export symbols residing in sections that
|
---|
2775 | aren't loaded. There are a number of these created so that
|
---|
2776 | we make sure certain module options don't appear twice. */
|
---|
2777 | i = f->header.e_shnum;
|
---|
2778 | loaded = alloca(sizeof(int) * i);
|
---|
2779 | while (--i >= 0)
|
---|
2780 | loaded[i] = (f->sections[i]->header.sh_flags & SHF_ALLOC) != 0;
|
---|
2781 |
|
---|
2782 | for (nsyms = i = 0; i < HASH_BUCKETS; ++i) {
|
---|
2783 | struct obj_symbol *sym;
|
---|
2784 | for (sym = f->symtab[i]; sym; sym = sym->next) {
|
---|
2785 | if (ELF_ST_BIND(sym->info) != STB_LOCAL
|
---|
2786 | && sym->secidx <= SHN_HIRESERVE
|
---|
2787 | && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx])
|
---|
2788 | ) {
|
---|
2789 | ElfW(Addr) ofs = nsyms * 2 * tgt_sizeof_void_p;
|
---|
2790 |
|
---|
2791 | obj_symbol_patch(f, sec->idx, ofs, sym);
|
---|
2792 | obj_string_patch(f, sec->idx, ofs + tgt_sizeof_void_p,
|
---|
2793 | sym->name);
|
---|
2794 | nsyms++;
|
---|
2795 | }
|
---|
2796 | }
|
---|
2797 | }
|
---|
2798 |
|
---|
2799 | obj_extend_section(sec, nsyms * 2 * tgt_sizeof_char_p);
|
---|
2800 | }
|
---|
2801 |
|
---|
2802 | return 1;
|
---|
2803 | }
|
---|
2804 |
|
---|
2805 |
|
---|
2806 | static int
|
---|
2807 | new_init_module(const char *m_name, struct obj_file *f, unsigned long m_size)
|
---|
2808 | {
|
---|
2809 | struct new_module *module;
|
---|
2810 | struct obj_section *sec;
|
---|
2811 | void *image;
|
---|
2812 | int ret;
|
---|
2813 | tgt_long m_addr;
|
---|
2814 |
|
---|
2815 | sec = obj_find_section(f, ".this");
|
---|
2816 | if (!sec || !sec->contents) {
|
---|
2817 | bb_perror_msg_and_die("corrupt module %s?", m_name);
|
---|
2818 | }
|
---|
2819 | module = (struct new_module *) sec->contents;
|
---|
2820 | m_addr = sec->header.sh_addr;
|
---|
2821 |
|
---|
2822 | module->size_of_struct = sizeof(*module);
|
---|
2823 | module->size = m_size;
|
---|
2824 | module->flags = flag_autoclean ? NEW_MOD_AUTOCLEAN : 0;
|
---|
2825 |
|
---|
2826 | sec = obj_find_section(f, "__ksymtab");
|
---|
2827 | if (sec && sec->header.sh_size) {
|
---|
2828 | module->syms = sec->header.sh_addr;
|
---|
2829 | module->nsyms = sec->header.sh_size / (2 * tgt_sizeof_char_p);
|
---|
2830 | }
|
---|
2831 |
|
---|
2832 | if (n_ext_modules_used) {
|
---|
2833 | sec = obj_find_section(f, ".kmodtab");
|
---|
2834 | module->deps = sec->header.sh_addr;
|
---|
2835 | module->ndeps = n_ext_modules_used;
|
---|
2836 | }
|
---|
2837 |
|
---|
2838 | module->init = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "init_module"));
|
---|
2839 | module->cleanup = obj_symbol_final_value(f, obj_find_symbol(f, SPFX "cleanup_module"));
|
---|
2840 |
|
---|
2841 | sec = obj_find_section(f, "__ex_table");
|
---|
2842 | if (sec) {
|
---|
2843 | module->ex_table_start = sec->header.sh_addr;
|
---|
2844 | module->ex_table_end = sec->header.sh_addr + sec->header.sh_size;
|
---|
2845 | }
|
---|
2846 |
|
---|
2847 | sec = obj_find_section(f, ".text.init");
|
---|
2848 | if (sec) {
|
---|
2849 | module->runsize = sec->header.sh_addr - m_addr;
|
---|
2850 | }
|
---|
2851 | sec = obj_find_section(f, ".data.init");
|
---|
2852 | if (sec) {
|
---|
2853 | if (!module->runsize
|
---|
2854 | || module->runsize > sec->header.sh_addr - m_addr
|
---|
2855 | ) {
|
---|
2856 | module->runsize = sec->header.sh_addr - m_addr;
|
---|
2857 | }
|
---|
2858 | }
|
---|
2859 | sec = obj_find_section(f, ARCHDATA_SEC_NAME);
|
---|
2860 | if (sec && sec->header.sh_size) {
|
---|
2861 | module->archdata_start = (void*)sec->header.sh_addr;
|
---|
2862 | module->archdata_end = module->archdata_start + sec->header.sh_size;
|
---|
2863 | }
|
---|
2864 | sec = obj_find_section(f, KALLSYMS_SEC_NAME);
|
---|
2865 | if (sec && sec->header.sh_size) {
|
---|
2866 | module->kallsyms_start = (void*)sec->header.sh_addr;
|
---|
2867 | module->kallsyms_end = module->kallsyms_start + sec->header.sh_size;
|
---|
2868 | }
|
---|
2869 |
|
---|
2870 | /* Whew! All of the initialization is complete. Collect the final
|
---|
2871 | module image and give it to the kernel. */
|
---|
2872 |
|
---|
2873 | image = xmalloc(m_size);
|
---|
2874 | obj_create_image(f, image);
|
---|
2875 |
|
---|
2876 | ret = init_module(m_name, (struct new_module *) image);
|
---|
2877 | if (ret)
|
---|
2878 | bb_perror_msg("init_module: %s", m_name);
|
---|
2879 |
|
---|
2880 | free(image);
|
---|
2881 |
|
---|
2882 | return ret == 0;
|
---|
2883 | }
|
---|
2884 |
|
---|
2885 |
|
---|
2886 | /*======================================================================*/
|
---|
2887 |
|
---|
2888 | static void
|
---|
2889 | obj_string_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
|
---|
2890 | const char *string)
|
---|
2891 | {
|
---|
2892 | struct obj_string_patch *p;
|
---|
2893 | struct obj_section *strsec;
|
---|
2894 | size_t len = strlen(string) + 1;
|
---|
2895 | char *loc;
|
---|
2896 |
|
---|
2897 | p = xzalloc(sizeof(*p));
|
---|
2898 | p->next = f->string_patches;
|
---|
2899 | p->reloc_secidx = secidx;
|
---|
2900 | p->reloc_offset = offset;
|
---|
2901 | f->string_patches = p;
|
---|
2902 |
|
---|
2903 | strsec = obj_find_section(f, ".kstrtab");
|
---|
2904 | if (strsec == NULL) {
|
---|
2905 | strsec = obj_create_alloced_section(f, ".kstrtab", 1, len);
|
---|
2906 | /*p->string_offset = 0;*/
|
---|
2907 | loc = strsec->contents;
|
---|
2908 | } else {
|
---|
2909 | p->string_offset = strsec->header.sh_size;
|
---|
2910 | loc = obj_extend_section(strsec, len);
|
---|
2911 | }
|
---|
2912 | memcpy(loc, string, len);
|
---|
2913 | }
|
---|
2914 |
|
---|
2915 | static void
|
---|
2916 | obj_symbol_patch(struct obj_file *f, int secidx, ElfW(Addr) offset,
|
---|
2917 | struct obj_symbol *sym)
|
---|
2918 | {
|
---|
2919 | struct obj_symbol_patch *p;
|
---|
2920 |
|
---|
2921 | p = xmalloc(sizeof(*p));
|
---|
2922 | p->next = f->symbol_patches;
|
---|
2923 | p->reloc_secidx = secidx;
|
---|
2924 | p->reloc_offset = offset;
|
---|
2925 | p->sym = sym;
|
---|
2926 | f->symbol_patches = p;
|
---|
2927 | }
|
---|
2928 |
|
---|
2929 | static void obj_check_undefineds(struct obj_file *f)
|
---|
2930 | {
|
---|
2931 | unsigned i;
|
---|
2932 |
|
---|
2933 | for (i = 0; i < HASH_BUCKETS; ++i) {
|
---|
2934 | struct obj_symbol *sym;
|
---|
2935 | for (sym = f->symtab[i]; sym; sym = sym->next) {
|
---|
2936 | if (sym->secidx == SHN_UNDEF) {
|
---|
2937 | if (ELF_ST_BIND(sym->info) == STB_WEAK) {
|
---|
2938 | sym->secidx = SHN_ABS;
|
---|
2939 | sym->value = 0;
|
---|
2940 | } else {
|
---|
2941 | if (!flag_quiet)
|
---|
2942 | bb_error_msg_and_die("unresolved symbol %s", sym->name);
|
---|
2943 | }
|
---|
2944 | }
|
---|
2945 | }
|
---|
2946 | }
|
---|
2947 | }
|
---|
2948 |
|
---|
2949 | static void obj_allocate_commons(struct obj_file *f)
|
---|
2950 | {
|
---|
2951 | struct common_entry {
|
---|
2952 | struct common_entry *next;
|
---|
2953 | struct obj_symbol *sym;
|
---|
2954 | } *common_head = NULL;
|
---|
2955 |
|
---|
2956 | unsigned long i;
|
---|
2957 |
|
---|
2958 | for (i = 0; i < HASH_BUCKETS; ++i) {
|
---|
2959 | struct obj_symbol *sym;
|
---|
2960 | for (sym = f->symtab[i]; sym; sym = sym->next) {
|
---|
2961 | if (sym->secidx == SHN_COMMON) {
|
---|
2962 | /* Collect all COMMON symbols and sort them by size so as to
|
---|
2963 | minimize space wasted by alignment requirements. */
|
---|
2964 | struct common_entry **p, *n;
|
---|
2965 | for (p = &common_head; *p; p = &(*p)->next)
|
---|
2966 | if (sym->size <= (*p)->sym->size)
|
---|
2967 | break;
|
---|
2968 | n = alloca(sizeof(*n));
|
---|
2969 | n->next = *p;
|
---|
2970 | n->sym = sym;
|
---|
2971 | *p = n;
|
---|
2972 | }
|
---|
2973 | }
|
---|
2974 | }
|
---|
2975 |
|
---|
2976 | for (i = 1; i < f->local_symtab_size; ++i) {
|
---|
2977 | struct obj_symbol *sym = f->local_symtab[i];
|
---|
2978 | if (sym && sym->secidx == SHN_COMMON) {
|
---|
2979 | struct common_entry **p, *n;
|
---|
2980 | for (p = &common_head; *p; p = &(*p)->next) {
|
---|
2981 | if (sym == (*p)->sym)
|
---|
2982 | break;
|
---|
2983 | if (sym->size < (*p)->sym->size) {
|
---|
2984 | n = alloca(sizeof(*n));
|
---|
2985 | n->next = *p;
|
---|
2986 | n->sym = sym;
|
---|
2987 | *p = n;
|
---|
2988 | break;
|
---|
2989 | }
|
---|
2990 | }
|
---|
2991 | }
|
---|
2992 | }
|
---|
2993 |
|
---|
2994 | if (common_head) {
|
---|
2995 | /* Find the bss section. */
|
---|
2996 | for (i = 0; i < f->header.e_shnum; ++i)
|
---|
2997 | if (f->sections[i]->header.sh_type == SHT_NOBITS)
|
---|
2998 | break;
|
---|
2999 |
|
---|
3000 | /* If for some reason there hadn't been one, create one. */
|
---|
3001 | if (i == f->header.e_shnum) {
|
---|
3002 | struct obj_section *sec;
|
---|
3003 |
|
---|
3004 | f->header.e_shnum++;
|
---|
3005 | f->sections = xrealloc_vector(f->sections, 2, i);
|
---|
3006 | f->sections[i] = sec = arch_new_section();
|
---|
3007 |
|
---|
3008 | sec->header.sh_type = SHT_PROGBITS;
|
---|
3009 | sec->header.sh_flags = SHF_WRITE | SHF_ALLOC;
|
---|
3010 | sec->name = ".bss";
|
---|
3011 | sec->idx = i;
|
---|
3012 | }
|
---|
3013 |
|
---|
3014 | /* Allocate the COMMONS. */
|
---|
3015 | {
|
---|
3016 | ElfW(Addr) bss_size = f->sections[i]->header.sh_size;
|
---|
3017 | ElfW(Addr) max_align = f->sections[i]->header.sh_addralign;
|
---|
3018 | struct common_entry *c;
|
---|
3019 |
|
---|
3020 | for (c = common_head; c; c = c->next) {
|
---|
3021 | ElfW(Addr) align = c->sym->value;
|
---|
3022 |
|
---|
3023 | if (align > max_align)
|
---|
3024 | max_align = align;
|
---|
3025 | if (bss_size & (align - 1))
|
---|
3026 | bss_size = (bss_size | (align - 1)) + 1;
|
---|
3027 |
|
---|
3028 | c->sym->secidx = i;
|
---|
3029 | c->sym->value = bss_size;
|
---|
3030 |
|
---|
3031 | bss_size += c->sym->size;
|
---|
3032 | }
|
---|
3033 |
|
---|
3034 | f->sections[i]->header.sh_size = bss_size;
|
---|
3035 | f->sections[i]->header.sh_addralign = max_align;
|
---|
3036 | }
|
---|
3037 | }
|
---|
3038 |
|
---|
3039 | /* For the sake of patch relocation and parameter initialization,
|
---|
3040 | allocate zeroed data for NOBITS sections now. Note that after
|
---|
3041 | this we cannot assume NOBITS are really empty. */
|
---|
3042 | for (i = 0; i < f->header.e_shnum; ++i) {
|
---|
3043 | struct obj_section *s = f->sections[i];
|
---|
3044 | if (s->header.sh_type == SHT_NOBITS) {
|
---|
3045 | s->contents = NULL;
|
---|
3046 | if (s->header.sh_size != 0)
|
---|
3047 | s->contents = xzalloc(s->header.sh_size);
|
---|
3048 | s->header.sh_type = SHT_PROGBITS;
|
---|
3049 | }
|
---|
3050 | }
|
---|
3051 | }
|
---|
3052 |
|
---|
3053 | static unsigned long obj_load_size(struct obj_file *f)
|
---|
3054 | {
|
---|
3055 | unsigned long dot = 0;
|
---|
3056 | struct obj_section *sec;
|
---|
3057 |
|
---|
3058 | /* Finalize the positions of the sections relative to one another. */
|
---|
3059 |
|
---|
3060 | for (sec = f->load_order; sec; sec = sec->load_next) {
|
---|
3061 | ElfW(Addr) align;
|
---|
3062 |
|
---|
3063 | align = sec->header.sh_addralign;
|
---|
3064 | if (align && (dot & (align - 1)))
|
---|
3065 | dot = (dot | (align - 1)) + 1;
|
---|
3066 |
|
---|
3067 | sec->header.sh_addr = dot;
|
---|
3068 | dot += sec->header.sh_size;
|
---|
3069 | }
|
---|
3070 |
|
---|
3071 | return dot;
|
---|
3072 | }
|
---|
3073 |
|
---|
3074 | static int obj_relocate(struct obj_file *f, ElfW(Addr) base)
|
---|
3075 | {
|
---|
3076 | int i, n = f->header.e_shnum;
|
---|
3077 | int ret = 1;
|
---|
3078 |
|
---|
3079 | /* Finalize the addresses of the sections. */
|
---|
3080 |
|
---|
3081 | f->baseaddr = base;
|
---|
3082 | for (i = 0; i < n; ++i)
|
---|
3083 | f->sections[i]->header.sh_addr += base;
|
---|
3084 |
|
---|
3085 | /* And iterate over all of the relocations. */
|
---|
3086 |
|
---|
3087 | for (i = 0; i < n; ++i) {
|
---|
3088 | struct obj_section *relsec, *symsec, *targsec, *strsec;
|
---|
3089 | ElfW(RelM) * rel, *relend;
|
---|
3090 | ElfW(Sym) * symtab;
|
---|
3091 | const char *strtab;
|
---|
3092 |
|
---|
3093 | relsec = f->sections[i];
|
---|
3094 | if (relsec->header.sh_type != SHT_RELM)
|
---|
3095 | continue;
|
---|
3096 |
|
---|
3097 | symsec = f->sections[relsec->header.sh_link];
|
---|
3098 | targsec = f->sections[relsec->header.sh_info];
|
---|
3099 | strsec = f->sections[symsec->header.sh_link];
|
---|
3100 |
|
---|
3101 | rel = (ElfW(RelM) *) relsec->contents;
|
---|
3102 | relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM)));
|
---|
3103 | symtab = (ElfW(Sym) *) symsec->contents;
|
---|
3104 | strtab = (const char *) strsec->contents;
|
---|
3105 |
|
---|
3106 | for (; rel < relend; ++rel) {
|
---|
3107 | ElfW(Addr) value = 0;
|
---|
3108 | struct obj_symbol *intsym = NULL;
|
---|
3109 | unsigned long symndx;
|
---|
3110 | ElfW(Sym) *extsym = NULL;
|
---|
3111 | const char *errmsg;
|
---|
3112 |
|
---|
3113 | /* Attempt to find a value to use for this relocation. */
|
---|
3114 |
|
---|
3115 | symndx = ELF_R_SYM(rel->r_info);
|
---|
3116 | if (symndx) {
|
---|
3117 | /* Note we've already checked for undefined symbols. */
|
---|
3118 |
|
---|
3119 | extsym = &symtab[symndx];
|
---|
3120 | if (ELF_ST_BIND(extsym->st_info) == STB_LOCAL) {
|
---|
3121 | /* Local symbols we look up in the local table to be sure
|
---|
3122 | we get the one that is really intended. */
|
---|
3123 | intsym = f->local_symtab[symndx];
|
---|
3124 | } else {
|
---|
3125 | /* Others we look up in the hash table. */
|
---|
3126 | const char *name;
|
---|
3127 | if (extsym->st_name)
|
---|
3128 | name = strtab + extsym->st_name;
|
---|
3129 | else
|
---|
3130 | name = f->sections[extsym->st_shndx]->name;
|
---|
3131 | intsym = obj_find_symbol(f, name);
|
---|
3132 | }
|
---|
3133 |
|
---|
3134 | value = obj_symbol_final_value(f, intsym);
|
---|
3135 | intsym->referenced = 1;
|
---|
3136 | }
|
---|
3137 | #if SHT_RELM == SHT_RELA
|
---|
3138 | #if defined(__alpha__) && defined(AXP_BROKEN_GAS)
|
---|
3139 | /* Work around a nasty GAS bug, that is fixed as of 2.7.0.9. */
|
---|
3140 | if (!extsym || !extsym->st_name
|
---|
3141 | || ELF_ST_BIND(extsym->st_info) != STB_LOCAL)
|
---|
3142 | #endif
|
---|
3143 | value += rel->r_addend;
|
---|
3144 | #endif
|
---|
3145 |
|
---|
3146 | /* Do it! */
|
---|
3147 | switch (arch_apply_relocation
|
---|
3148 | (f, targsec, /*symsec,*/ intsym, rel, value)
|
---|
3149 | ) {
|
---|
3150 | case obj_reloc_ok:
|
---|
3151 | break;
|
---|
3152 |
|
---|
3153 | case obj_reloc_overflow:
|
---|
3154 | errmsg = "Relocation overflow";
|
---|
3155 | goto bad_reloc;
|
---|
3156 | case obj_reloc_dangerous:
|
---|
3157 | errmsg = "Dangerous relocation";
|
---|
3158 | goto bad_reloc;
|
---|
3159 | case obj_reloc_unhandled:
|
---|
3160 | errmsg = "Unhandled relocation";
|
---|
3161 | bad_reloc:
|
---|
3162 | if (extsym) {
|
---|
3163 | bb_error_msg("%s of type %ld for %s", errmsg,
|
---|
3164 | (long) ELF_R_TYPE(rel->r_info),
|
---|
3165 | strtab + extsym->st_name);
|
---|
3166 | } else {
|
---|
3167 | bb_error_msg("%s of type %ld", errmsg,
|
---|
3168 | (long) ELF_R_TYPE(rel->r_info));
|
---|
3169 | }
|
---|
3170 | ret = 0;
|
---|
3171 | break;
|
---|
3172 | }
|
---|
3173 | }
|
---|
3174 | }
|
---|
3175 |
|
---|
3176 | /* Finally, take care of the patches. */
|
---|
3177 |
|
---|
3178 | if (f->string_patches) {
|
---|
3179 | struct obj_string_patch *p;
|
---|
3180 | struct obj_section *strsec;
|
---|
3181 | ElfW(Addr) strsec_base;
|
---|
3182 | strsec = obj_find_section(f, ".kstrtab");
|
---|
3183 | strsec_base = strsec->header.sh_addr;
|
---|
3184 |
|
---|
3185 | for (p = f->string_patches; p; p = p->next) {
|
---|
3186 | struct obj_section *targsec = f->sections[p->reloc_secidx];
|
---|
3187 | *(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
|
---|
3188 | = strsec_base + p->string_offset;
|
---|
3189 | }
|
---|
3190 | }
|
---|
3191 |
|
---|
3192 | if (f->symbol_patches) {
|
---|
3193 | struct obj_symbol_patch *p;
|
---|
3194 |
|
---|
3195 | for (p = f->symbol_patches; p; p = p->next) {
|
---|
3196 | struct obj_section *targsec = f->sections[p->reloc_secidx];
|
---|
3197 | *(ElfW(Addr) *) (targsec->contents + p->reloc_offset)
|
---|
3198 | = obj_symbol_final_value(f, p->sym);
|
---|
3199 | }
|
---|
3200 | }
|
---|
3201 |
|
---|
3202 | return ret;
|
---|
3203 | }
|
---|
3204 |
|
---|
3205 | static int obj_create_image(struct obj_file *f, char *image)
|
---|
3206 | {
|
---|
3207 | struct obj_section *sec;
|
---|
3208 | ElfW(Addr) base = f->baseaddr;
|
---|
3209 |
|
---|
3210 | for (sec = f->load_order; sec; sec = sec->load_next) {
|
---|
3211 | char *secimg;
|
---|
3212 |
|
---|
3213 | if (sec->contents == 0 || sec->header.sh_size == 0)
|
---|
3214 | continue;
|
---|
3215 |
|
---|
3216 | secimg = image + (sec->header.sh_addr - base);
|
---|
3217 |
|
---|
3218 | /* Note that we allocated data for NOBITS sections earlier. */
|
---|
3219 | memcpy(secimg, sec->contents, sec->header.sh_size);
|
---|
3220 | }
|
---|
3221 |
|
---|
3222 | return 1;
|
---|
3223 | }
|
---|
3224 |
|
---|
3225 | /*======================================================================*/
|
---|
3226 |
|
---|
3227 | static struct obj_file *obj_load(char *image, size_t image_size, int loadprogbits)
|
---|
3228 | {
|
---|
3229 | typedef uint32_t aliased_uint32_t FIX_ALIASING;
|
---|
3230 | #if BB_LITTLE_ENDIAN
|
---|
3231 | # define ELFMAG_U32 ((uint32_t)(ELFMAG0 + 0x100 * (ELFMAG1 + (0x100 * (ELFMAG2 + 0x100 * ELFMAG3)))))
|
---|
3232 | #else
|
---|
3233 | # define ELFMAG_U32 ((uint32_t)((((ELFMAG0 * 0x100) + ELFMAG1) * 0x100 + ELFMAG2) * 0x100 + ELFMAG3))
|
---|
3234 | #endif
|
---|
3235 | struct obj_file *f;
|
---|
3236 | ElfW(Shdr) * section_headers;
|
---|
3237 | size_t shnum, i;
|
---|
3238 | char *shstrtab;
|
---|
3239 |
|
---|
3240 | /* Read the file header. */
|
---|
3241 |
|
---|
3242 | f = arch_new_file();
|
---|
3243 | f->symbol_cmp = strcmp;
|
---|
3244 | f->symbol_hash = obj_elf_hash;
|
---|
3245 | f->load_order_search_start = &f->load_order;
|
---|
3246 |
|
---|
3247 | if (image_size < sizeof(f->header))
|
---|
3248 | bb_error_msg_and_die("error while loading ELF header");
|
---|
3249 | memcpy(&f->header, image, sizeof(f->header));
|
---|
3250 |
|
---|
3251 | if (*(aliased_uint32_t*)(&f->header.e_ident) != ELFMAG_U32) {
|
---|
3252 | bb_error_msg_and_die("not an ELF file");
|
---|
3253 | }
|
---|
3254 | if (f->header.e_ident[EI_CLASS] != ELFCLASSM
|
---|
3255 | || f->header.e_ident[EI_DATA] != (BB_BIG_ENDIAN ? ELFDATA2MSB : ELFDATA2LSB)
|
---|
3256 | || f->header.e_ident[EI_VERSION] != EV_CURRENT
|
---|
3257 | || !MATCH_MACHINE(f->header.e_machine)
|
---|
3258 | ) {
|
---|
3259 | bb_error_msg_and_die("ELF file not for this architecture");
|
---|
3260 | }
|
---|
3261 | if (f->header.e_type != ET_REL) {
|
---|
3262 | bb_error_msg_and_die("ELF file not a relocatable object");
|
---|
3263 | }
|
---|
3264 |
|
---|
3265 | /* Read the section headers. */
|
---|
3266 |
|
---|
3267 | if (f->header.e_shentsize != sizeof(ElfW(Shdr))) {
|
---|
3268 | bb_error_msg_and_die("section header size mismatch: %lu != %lu",
|
---|
3269 | (unsigned long) f->header.e_shentsize,
|
---|
3270 | (unsigned long) sizeof(ElfW(Shdr)));
|
---|
3271 | }
|
---|
3272 |
|
---|
3273 | shnum = f->header.e_shnum;
|
---|
3274 | /* Growth of ->sections vector will be done by
|
---|
3275 | * xrealloc_vector(..., 2, ...), therefore we must allocate
|
---|
3276 | * at least 2^2 = 4 extra elements here. */
|
---|
3277 | f->sections = xzalloc(sizeof(f->sections[0]) * (shnum + 4));
|
---|
3278 |
|
---|
3279 | section_headers = alloca(sizeof(ElfW(Shdr)) * shnum);
|
---|
3280 | if (image_size < f->header.e_shoff + sizeof(ElfW(Shdr)) * shnum)
|
---|
3281 | bb_error_msg_and_die("error while loading section headers");
|
---|
3282 | memcpy(section_headers, image + f->header.e_shoff, sizeof(ElfW(Shdr)) * shnum);
|
---|
3283 |
|
---|
3284 | /* Read the section data. */
|
---|
3285 |
|
---|
3286 | for (i = 0; i < shnum; ++i) {
|
---|
3287 | struct obj_section *sec;
|
---|
3288 |
|
---|
3289 | f->sections[i] = sec = arch_new_section();
|
---|
3290 |
|
---|
3291 | sec->header = section_headers[i];
|
---|
3292 | sec->idx = i;
|
---|
3293 |
|
---|
3294 | if (sec->header.sh_size) {
|
---|
3295 | switch (sec->header.sh_type) {
|
---|
3296 | case SHT_NULL:
|
---|
3297 | case SHT_NOTE:
|
---|
3298 | case SHT_NOBITS:
|
---|
3299 | /* ignore */
|
---|
3300 | break;
|
---|
3301 | case SHT_PROGBITS:
|
---|
3302 | #if LOADBITS
|
---|
3303 | if (!loadprogbits) {
|
---|
3304 | sec->contents = NULL;
|
---|
3305 | break;
|
---|
3306 | }
|
---|
3307 | #endif
|
---|
3308 | case SHT_SYMTAB:
|
---|
3309 | case SHT_STRTAB:
|
---|
3310 | case SHT_RELM:
|
---|
3311 | #if defined(__mips__)
|
---|
3312 | case SHT_MIPS_DWARF:
|
---|
3313 | #endif
|
---|
3314 | sec->contents = NULL;
|
---|
3315 | if (sec->header.sh_size > 0) {
|
---|
3316 | sec->contents = xmalloc(sec->header.sh_size);
|
---|
3317 | if (image_size < (sec->header.sh_offset + sec->header.sh_size))
|
---|
3318 | bb_error_msg_and_die("error while loading section data");
|
---|
3319 | memcpy(sec->contents, image + sec->header.sh_offset, sec->header.sh_size);
|
---|
3320 | }
|
---|
3321 | break;
|
---|
3322 | #if SHT_RELM == SHT_REL
|
---|
3323 | case SHT_RELA:
|
---|
3324 | bb_error_msg_and_die("RELA relocations not supported on this architecture");
|
---|
3325 | #else
|
---|
3326 | case SHT_REL:
|
---|
3327 | bb_error_msg_and_die("REL relocations not supported on this architecture");
|
---|
3328 | #endif
|
---|
3329 | default:
|
---|
3330 | if (sec->header.sh_type >= SHT_LOPROC) {
|
---|
3331 | /* Assume processor specific section types are debug
|
---|
3332 | info and can safely be ignored. If this is ever not
|
---|
3333 | the case (Hello MIPS?), don't put ifdefs here but
|
---|
3334 | create an arch_load_proc_section(). */
|
---|
3335 | break;
|
---|
3336 | }
|
---|
3337 |
|
---|
3338 | bb_error_msg_and_die("can't handle sections of type %ld",
|
---|
3339 | (long) sec->header.sh_type);
|
---|
3340 | }
|
---|
3341 | }
|
---|
3342 | }
|
---|
3343 |
|
---|
3344 | /* Do what sort of interpretation as needed by each section. */
|
---|
3345 |
|
---|
3346 | shstrtab = f->sections[f->header.e_shstrndx]->contents;
|
---|
3347 |
|
---|
3348 | for (i = 0; i < shnum; ++i) {
|
---|
3349 | struct obj_section *sec = f->sections[i];
|
---|
3350 | sec->name = shstrtab + sec->header.sh_name;
|
---|
3351 | }
|
---|
3352 |
|
---|
3353 | for (i = 0; i < shnum; ++i) {
|
---|
3354 | struct obj_section *sec = f->sections[i];
|
---|
3355 |
|
---|
3356 | /* .modinfo should be contents only but gcc has no attribute for that.
|
---|
3357 | * The kernel may have marked .modinfo as ALLOC, ignore this bit.
|
---|
3358 | */
|
---|
3359 | if (strcmp(sec->name, ".modinfo") == 0)
|
---|
3360 | sec->header.sh_flags &= ~SHF_ALLOC;
|
---|
3361 |
|
---|
3362 | if (sec->header.sh_flags & SHF_ALLOC)
|
---|
3363 | obj_insert_section_load_order(f, sec);
|
---|
3364 |
|
---|
3365 | switch (sec->header.sh_type) {
|
---|
3366 | case SHT_SYMTAB:
|
---|
3367 | {
|
---|
3368 | unsigned long nsym, j;
|
---|
3369 | char *strtab;
|
---|
3370 | ElfW(Sym) * sym;
|
---|
3371 |
|
---|
3372 | if (sec->header.sh_entsize != sizeof(ElfW(Sym))) {
|
---|
3373 | bb_error_msg_and_die("symbol size mismatch: %lu != %lu",
|
---|
3374 | (unsigned long) sec->header.sh_entsize,
|
---|
3375 | (unsigned long) sizeof(ElfW(Sym)));
|
---|
3376 | }
|
---|
3377 |
|
---|
3378 | nsym = sec->header.sh_size / sizeof(ElfW(Sym));
|
---|
3379 | strtab = f->sections[sec->header.sh_link]->contents;
|
---|
3380 | sym = (ElfW(Sym) *) sec->contents;
|
---|
3381 |
|
---|
3382 | /* Allocate space for a table of local symbols. */
|
---|
3383 | j = f->local_symtab_size = sec->header.sh_info;
|
---|
3384 | f->local_symtab = xzalloc(j * sizeof(struct obj_symbol *));
|
---|
3385 |
|
---|
3386 | /* Insert all symbols into the hash table. */
|
---|
3387 | for (j = 1, ++sym; j < nsym; ++j, ++sym) {
|
---|
3388 | ElfW(Addr) val = sym->st_value;
|
---|
3389 | const char *name;
|
---|
3390 | if (sym->st_name)
|
---|
3391 | name = strtab + sym->st_name;
|
---|
3392 | else if (sym->st_shndx < shnum)
|
---|
3393 | name = f->sections[sym->st_shndx]->name;
|
---|
3394 | else
|
---|
3395 | continue;
|
---|
3396 | #if defined(__SH5__)
|
---|
3397 | /*
|
---|
3398 | * For sh64 it is possible that the target of a branch
|
---|
3399 | * requires a mode switch (32 to 16 and back again).
|
---|
3400 | *
|
---|
3401 | * This is implied by the lsb being set in the target
|
---|
3402 | * address for SHmedia mode and clear for SHcompact.
|
---|
3403 | */
|
---|
3404 | val |= sym->st_other & 4;
|
---|
3405 | #endif
|
---|
3406 | obj_add_symbol(f, name, j, sym->st_info, sym->st_shndx,
|
---|
3407 | val, sym->st_size);
|
---|
3408 | }
|
---|
3409 | }
|
---|
3410 | break;
|
---|
3411 |
|
---|
3412 | case SHT_RELM:
|
---|
3413 | if (sec->header.sh_entsize != sizeof(ElfW(RelM))) {
|
---|
3414 | bb_error_msg_and_die("relocation entry size mismatch: %lu != %lu",
|
---|
3415 | (unsigned long) sec->header.sh_entsize,
|
---|
3416 | (unsigned long) sizeof(ElfW(RelM)));
|
---|
3417 | }
|
---|
3418 | break;
|
---|
3419 | /* XXX Relocation code from modutils-2.3.19 is not here.
|
---|
3420 | * Why? That's about 20 lines of code from obj/obj_load.c,
|
---|
3421 | * which gets done in a second pass through the sections.
|
---|
3422 | * This BusyBox insmod does similar work in obj_relocate(). */
|
---|
3423 | }
|
---|
3424 | }
|
---|
3425 |
|
---|
3426 | return f;
|
---|
3427 | }
|
---|
3428 |
|
---|
3429 | #if ENABLE_FEATURE_INSMOD_LOADINKMEM
|
---|
3430 | /*
|
---|
3431 | * load the unloaded sections directly into the memory allocated by
|
---|
3432 | * kernel for the module
|
---|
3433 | */
|
---|
3434 |
|
---|
3435 | static int obj_load_progbits(char *image, size_t image_size, struct obj_file *f, char *imagebase)
|
---|
3436 | {
|
---|
3437 | ElfW(Addr) base = f->baseaddr;
|
---|
3438 | struct obj_section* sec;
|
---|
3439 |
|
---|
3440 | for (sec = f->load_order; sec; sec = sec->load_next) {
|
---|
3441 | /* section already loaded? */
|
---|
3442 | if (sec->contents != NULL)
|
---|
3443 | continue;
|
---|
3444 | if (sec->header.sh_size == 0)
|
---|
3445 | continue;
|
---|
3446 | sec->contents = imagebase + (sec->header.sh_addr - base);
|
---|
3447 | if (image_size < (sec->header.sh_offset + sec->header.sh_size)) {
|
---|
3448 | bb_error_msg("error reading ELF section data");
|
---|
3449 | return 0; /* need to delete half-loaded module! */
|
---|
3450 | }
|
---|
3451 | memcpy(sec->contents, image + sec->header.sh_offset, sec->header.sh_size);
|
---|
3452 | }
|
---|
3453 | return 1;
|
---|
3454 | }
|
---|
3455 | #endif
|
---|
3456 |
|
---|
3457 | static void hide_special_symbols(struct obj_file *f)
|
---|
3458 | {
|
---|
3459 | static const char *const specials[] = {
|
---|
3460 | SPFX "cleanup_module",
|
---|
3461 | SPFX "init_module",
|
---|
3462 | SPFX "kernel_version",
|
---|
3463 | NULL
|
---|
3464 | };
|
---|
3465 |
|
---|
3466 | struct obj_symbol *sym;
|
---|
3467 | const char *const *p;
|
---|
3468 |
|
---|
3469 | for (p = specials; *p; ++p) {
|
---|
3470 | sym = obj_find_symbol(f, *p);
|
---|
3471 | if (sym != NULL)
|
---|
3472 | sym->info = ELF_ST_INFO(STB_LOCAL, ELF_ST_TYPE(sym->info));
|
---|
3473 | }
|
---|
3474 | }
|
---|
3475 |
|
---|
3476 |
|
---|
3477 | #if ENABLE_FEATURE_CHECK_TAINTED_MODULE
|
---|
3478 | static int obj_gpl_license(struct obj_file *f, const char **license)
|
---|
3479 | {
|
---|
3480 | struct obj_section *sec;
|
---|
3481 | /* This list must match *exactly* the list of allowable licenses in
|
---|
3482 | * linux/include/linux/module.h. Checking for leading "GPL" will not
|
---|
3483 | * work, somebody will use "GPL sucks, this is proprietary".
|
---|
3484 | */
|
---|
3485 | static const char *const gpl_licenses[] = {
|
---|
3486 | "GPL",
|
---|
3487 | "GPL v2",
|
---|
3488 | "GPL and additional rights",
|
---|
3489 | "Dual BSD/GPL",
|
---|
3490 | "Dual MPL/GPL"
|
---|
3491 | };
|
---|
3492 |
|
---|
3493 | sec = obj_find_section(f, ".modinfo");
|
---|
3494 | if (sec) {
|
---|
3495 | const char *value, *ptr, *endptr;
|
---|
3496 | ptr = sec->contents;
|
---|
3497 | endptr = ptr + sec->header.sh_size;
|
---|
3498 | while (ptr < endptr) {
|
---|
3499 | value = strchr(ptr, '=');
|
---|
3500 | if (value && strncmp(ptr, "license", value-ptr) == 0) {
|
---|
3501 | unsigned i;
|
---|
3502 | if (license)
|
---|
3503 | *license = value+1;
|
---|
3504 | for (i = 0; i < ARRAY_SIZE(gpl_licenses); ++i) {
|
---|
3505 | if (strcmp(value+1, gpl_licenses[i]) == 0)
|
---|
3506 | return 0;
|
---|
3507 | }
|
---|
3508 | return 2;
|
---|
3509 | }
|
---|
3510 | ptr = strchr(ptr, '\0');
|
---|
3511 | if (ptr)
|
---|
3512 | ptr++;
|
---|
3513 | else
|
---|
3514 | ptr = endptr;
|
---|
3515 | }
|
---|
3516 | }
|
---|
3517 | return 1;
|
---|
3518 | }
|
---|
3519 |
|
---|
3520 | #define TAINT_FILENAME "/proc/sys/kernel/tainted"
|
---|
3521 | #define TAINT_PROPRIETORY_MODULE (1 << 0)
|
---|
3522 | #define TAINT_FORCED_MODULE (1 << 1)
|
---|
3523 | #define TAINT_UNSAFE_SMP (1 << 2)
|
---|
3524 | #define TAINT_URL "http://www.tux.org/lkml/#export-tainted"
|
---|
3525 |
|
---|
3526 | static void set_tainted(int fd, const char *m_name,
|
---|
3527 | int kernel_has_tainted, int taint,
|
---|
3528 | const char *text1, const char *text2)
|
---|
3529 | {
|
---|
3530 | static smallint printed_info;
|
---|
3531 |
|
---|
3532 | char buf[80];
|
---|
3533 | int oldval;
|
---|
3534 |
|
---|
3535 | if (fd < 0 && !kernel_has_tainted)
|
---|
3536 | return; /* New modutils on old kernel */
|
---|
3537 | printf("Warning: loading %s will taint the kernel: %s%s\n",
|
---|
3538 | m_name, text1, text2);
|
---|
3539 | if (!printed_info) {
|
---|
3540 | printf(" See %s for information about tainted modules\n", TAINT_URL);
|
---|
3541 | printed_info = 1;
|
---|
3542 | }
|
---|
3543 | if (fd >= 0) {
|
---|
3544 | read(fd, buf, sizeof(buf)-1);
|
---|
3545 | buf[sizeof(buf)-1] = '\0';
|
---|
3546 | oldval = strtoul(buf, NULL, 10);
|
---|
3547 | sprintf(buf, "%d\n", oldval | taint);
|
---|
3548 | xwrite_str(fd, buf);
|
---|
3549 | }
|
---|
3550 | }
|
---|
3551 |
|
---|
3552 | /* Check if loading this module will taint the kernel. */
|
---|
3553 | static void check_tainted_module(struct obj_file *f, const char *m_name)
|
---|
3554 | {
|
---|
3555 | int fd, kernel_has_tainted;
|
---|
3556 | const char *ptr;
|
---|
3557 |
|
---|
3558 | kernel_has_tainted = 1;
|
---|
3559 | fd = open(TAINT_FILENAME, O_RDWR);
|
---|
3560 | if (fd < 0) {
|
---|
3561 | if (errno == ENOENT)
|
---|
3562 | kernel_has_tainted = 0;
|
---|
3563 | else if (errno == EACCES)
|
---|
3564 | kernel_has_tainted = 1;
|
---|
3565 | else {
|
---|
3566 | bb_simple_perror_msg(TAINT_FILENAME);
|
---|
3567 | kernel_has_tainted = 0;
|
---|
3568 | }
|
---|
3569 | }
|
---|
3570 |
|
---|
3571 | switch (obj_gpl_license(f, &ptr)) {
|
---|
3572 | case 0:
|
---|
3573 | break;
|
---|
3574 | case 1:
|
---|
3575 | set_tainted(fd, m_name, kernel_has_tainted, TAINT_PROPRIETORY_MODULE, "no license", "");
|
---|
3576 | break;
|
---|
3577 | default: /* case 2: */
|
---|
3578 | /* The module has a non-GPL license so we pretend that the
|
---|
3579 | * kernel always has a taint flag to get a warning even on
|
---|
3580 | * kernels without the proc flag.
|
---|
3581 | */
|
---|
3582 | set_tainted(fd, m_name, 1, TAINT_PROPRIETORY_MODULE, "non-GPL license - ", ptr);
|
---|
3583 | break;
|
---|
3584 | }
|
---|
3585 |
|
---|
3586 | if (flag_force_load)
|
---|
3587 | set_tainted(fd, m_name, 1, TAINT_FORCED_MODULE, "forced load", "");
|
---|
3588 |
|
---|
3589 | if (fd >= 0)
|
---|
3590 | close(fd);
|
---|
3591 | }
|
---|
3592 | #else /* !FEATURE_CHECK_TAINTED_MODULE */
|
---|
3593 | #define check_tainted_module(x, y) do { } while (0);
|
---|
3594 | #endif
|
---|
3595 |
|
---|
3596 | #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
|
---|
3597 | /* add module source, timestamp, kernel version and a symbol for the
|
---|
3598 | * start of some sections. this info is used by ksymoops to do better
|
---|
3599 | * debugging.
|
---|
3600 | */
|
---|
3601 | #if !ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3602 | #define get_module_version(f, str) get_module_version(str)
|
---|
3603 | #endif
|
---|
3604 | static int
|
---|
3605 | get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
|
---|
3606 | {
|
---|
3607 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3608 | return new_get_module_version(f, str);
|
---|
3609 | #else
|
---|
3610 | strncpy(str, "???", sizeof(str));
|
---|
3611 | return -1;
|
---|
3612 | #endif
|
---|
3613 | }
|
---|
3614 |
|
---|
3615 | /* add module source, timestamp, kernel version and a symbol for the
|
---|
3616 | * start of some sections. this info is used by ksymoops to do better
|
---|
3617 | * debugging.
|
---|
3618 | */
|
---|
3619 | static void
|
---|
3620 | add_ksymoops_symbols(struct obj_file *f, const char *filename,
|
---|
3621 | const char *m_name)
|
---|
3622 | {
|
---|
3623 | static const char symprefix[] ALIGN1 = "__insmod_";
|
---|
3624 | static const char section_names[][8] = {
|
---|
3625 | ".text",
|
---|
3626 | ".rodata",
|
---|
3627 | ".data",
|
---|
3628 | ".bss",
|
---|
3629 | ".sbss"
|
---|
3630 | };
|
---|
3631 |
|
---|
3632 | struct obj_section *sec;
|
---|
3633 | struct obj_symbol *sym;
|
---|
3634 | char *name, *absolute_filename;
|
---|
3635 | char str[STRVERSIONLEN];
|
---|
3636 | unsigned i;
|
---|
3637 | int lm_name, lfilename, use_ksymtab, version;
|
---|
3638 | struct stat statbuf;
|
---|
3639 |
|
---|
3640 | /* WARNING: was using realpath, but replaced by readlink to stop using
|
---|
3641 | * lots of stack. But here it seems to be able to cause problems? */
|
---|
3642 | absolute_filename = xmalloc_readlink(filename);
|
---|
3643 | if (!absolute_filename)
|
---|
3644 | absolute_filename = xstrdup(filename);
|
---|
3645 |
|
---|
3646 | lm_name = strlen(m_name);
|
---|
3647 | lfilename = strlen(absolute_filename);
|
---|
3648 |
|
---|
3649 | /* add to ksymtab if it already exists or there is no ksymtab and other symbols
|
---|
3650 | * are not to be exported. otherwise leave ksymtab alone for now, the
|
---|
3651 | * "export all symbols" compatibility code will export these symbols later.
|
---|
3652 | */
|
---|
3653 | use_ksymtab = obj_find_section(f, "__ksymtab") || flag_noexport;
|
---|
3654 |
|
---|
3655 | sec = obj_find_section(f, ".this");
|
---|
3656 | if (sec) {
|
---|
3657 | /* tag the module header with the object name, last modified
|
---|
3658 | * timestamp and module version. worst case for module version
|
---|
3659 | * is 0xffffff, decimal 16777215. putting all three fields in
|
---|
3660 | * one symbol is less readable but saves kernel space.
|
---|
3661 | */
|
---|
3662 | if (stat(absolute_filename, &statbuf) != 0)
|
---|
3663 | statbuf.st_mtime = 0;
|
---|
3664 | version = get_module_version(f, str); /* -1 if not found */
|
---|
3665 | name = xasprintf("%s%s_O%s_M%0*lX_V%d",
|
---|
3666 | symprefix, m_name, absolute_filename,
|
---|
3667 | (int)(2 * sizeof(statbuf.st_mtime)),
|
---|
3668 | (long)statbuf.st_mtime,
|
---|
3669 | version);
|
---|
3670 | sym = obj_add_symbol(f, name, -1,
|
---|
3671 | ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
---|
3672 | sec->idx, sec->header.sh_addr, 0);
|
---|
3673 | if (use_ksymtab)
|
---|
3674 | new_add_ksymtab(f, sym);
|
---|
3675 | }
|
---|
3676 | free(absolute_filename);
|
---|
3677 | #ifdef _NOT_SUPPORTED_
|
---|
3678 | /* record where the persistent data is going, same address as previous symbol */
|
---|
3679 | if (f->persist) {
|
---|
3680 | name = xasprintf("%s%s_P%s",
|
---|
3681 | symprefix, m_name, f->persist);
|
---|
3682 | sym = obj_add_symbol(f, name, -1, ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
---|
3683 | sec->idx, sec->header.sh_addr, 0);
|
---|
3684 | if (use_ksymtab)
|
---|
3685 | new_add_ksymtab(f, sym);
|
---|
3686 | }
|
---|
3687 | #endif
|
---|
3688 | /* tag the desired sections if size is non-zero */
|
---|
3689 | for (i = 0; i < ARRAY_SIZE(section_names); ++i) {
|
---|
3690 | sec = obj_find_section(f, section_names[i]);
|
---|
3691 | if (sec && sec->header.sh_size) {
|
---|
3692 | name = xasprintf("%s%s_S%s_L%ld",
|
---|
3693 | symprefix, m_name, sec->name,
|
---|
3694 | (long)sec->header.sh_size);
|
---|
3695 | sym = obj_add_symbol(f, name, -1, ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE),
|
---|
3696 | sec->idx, sec->header.sh_addr, 0);
|
---|
3697 | if (use_ksymtab)
|
---|
3698 | new_add_ksymtab(f, sym);
|
---|
3699 | }
|
---|
3700 | }
|
---|
3701 | }
|
---|
3702 | #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */
|
---|
3703 |
|
---|
3704 | #if ENABLE_FEATURE_INSMOD_LOAD_MAP
|
---|
3705 | static void print_load_map(struct obj_file *f)
|
---|
3706 | {
|
---|
3707 | struct obj_section *sec;
|
---|
3708 | #if ENABLE_FEATURE_INSMOD_LOAD_MAP_FULL
|
---|
3709 | struct obj_symbol **all, **p;
|
---|
3710 | int i, nsyms;
|
---|
3711 | char *loaded; /* array of booleans */
|
---|
3712 | struct obj_symbol *sym;
|
---|
3713 | #endif
|
---|
3714 | /* Report on the section layout. */
|
---|
3715 | printf("Sections: Size %-*s Align\n",
|
---|
3716 | (int) (2 * sizeof(void *)), "Address");
|
---|
3717 |
|
---|
3718 | for (sec = f->load_order; sec; sec = sec->load_next) {
|
---|
3719 | int a;
|
---|
3720 | unsigned long tmp;
|
---|
3721 |
|
---|
3722 | for (a = -1, tmp = sec->header.sh_addralign; tmp; ++a)
|
---|
3723 | tmp >>= 1;
|
---|
3724 | if (a == -1)
|
---|
3725 | a = 0;
|
---|
3726 |
|
---|
3727 | printf("%-15s %08lx %0*lx 2**%d\n",
|
---|
3728 | sec->name,
|
---|
3729 | (long)sec->header.sh_size,
|
---|
3730 | (int) (2 * sizeof(void *)),
|
---|
3731 | (long)sec->header.sh_addr,
|
---|
3732 | a);
|
---|
3733 | }
|
---|
3734 | #if ENABLE_FEATURE_INSMOD_LOAD_MAP_FULL
|
---|
3735 | /* Quick reference which section indices are loaded. */
|
---|
3736 | i = f->header.e_shnum;
|
---|
3737 | loaded = alloca(i * sizeof(loaded[0]));
|
---|
3738 | while (--i >= 0)
|
---|
3739 | loaded[i] = ((f->sections[i]->header.sh_flags & SHF_ALLOC) != 0);
|
---|
3740 |
|
---|
3741 | /* Collect the symbols we'll be listing. */
|
---|
3742 | for (nsyms = i = 0; i < HASH_BUCKETS; ++i)
|
---|
3743 | for (sym = f->symtab[i]; sym; sym = sym->next)
|
---|
3744 | if (sym->secidx <= SHN_HIRESERVE
|
---|
3745 | && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx])
|
---|
3746 | ) {
|
---|
3747 | ++nsyms;
|
---|
3748 | }
|
---|
3749 |
|
---|
3750 | all = alloca(nsyms * sizeof(all[0]));
|
---|
3751 |
|
---|
3752 | for (i = 0, p = all; i < HASH_BUCKETS; ++i)
|
---|
3753 | for (sym = f->symtab[i]; sym; sym = sym->next)
|
---|
3754 | if (sym->secidx <= SHN_HIRESERVE
|
---|
3755 | && (sym->secidx >= SHN_LORESERVE || loaded[sym->secidx])
|
---|
3756 | ) {
|
---|
3757 | *p++ = sym;
|
---|
3758 | }
|
---|
3759 |
|
---|
3760 | /* And list them. */
|
---|
3761 | printf("\nSymbols:\n");
|
---|
3762 | for (p = all; p < all + nsyms; ++p) {
|
---|
3763 | char type = '?';
|
---|
3764 | unsigned long value;
|
---|
3765 |
|
---|
3766 | sym = *p;
|
---|
3767 | if (sym->secidx == SHN_ABS) {
|
---|
3768 | type = 'A';
|
---|
3769 | value = sym->value;
|
---|
3770 | } else if (sym->secidx == SHN_UNDEF) {
|
---|
3771 | type = 'U';
|
---|
3772 | value = 0;
|
---|
3773 | } else {
|
---|
3774 | sec = f->sections[sym->secidx];
|
---|
3775 |
|
---|
3776 | if (sec->header.sh_type == SHT_NOBITS)
|
---|
3777 | type = 'B';
|
---|
3778 | else if (sec->header.sh_flags & SHF_ALLOC) {
|
---|
3779 | if (sec->header.sh_flags & SHF_EXECINSTR)
|
---|
3780 | type = 'T';
|
---|
3781 | else if (sec->header.sh_flags & SHF_WRITE)
|
---|
3782 | type = 'D';
|
---|
3783 | else
|
---|
3784 | type = 'R';
|
---|
3785 | }
|
---|
3786 | value = sym->value + sec->header.sh_addr;
|
---|
3787 | }
|
---|
3788 |
|
---|
3789 | if (ELF_ST_BIND(sym->info) == STB_LOCAL)
|
---|
3790 | type |= 0x20; /* tolower. safe for '?' too */
|
---|
3791 |
|
---|
3792 | printf("%0*lx %c %s\n", (int) (2 * sizeof(void *)), value,
|
---|
3793 | type, sym->name);
|
---|
3794 | }
|
---|
3795 | #endif
|
---|
3796 | }
|
---|
3797 | #else /* !FEATURE_INSMOD_LOAD_MAP */
|
---|
3798 | static void print_load_map(struct obj_file *f UNUSED_PARAM)
|
---|
3799 | {
|
---|
3800 | }
|
---|
3801 | #endif
|
---|
3802 |
|
---|
3803 | int FAST_FUNC bb_init_module_24(const char *m_filename, const char *options)
|
---|
3804 | {
|
---|
3805 | int k_crcs;
|
---|
3806 | unsigned long m_size;
|
---|
3807 | ElfW(Addr) m_addr;
|
---|
3808 | struct obj_file *f;
|
---|
3809 | int exit_status = EXIT_FAILURE;
|
---|
3810 | char *m_name;
|
---|
3811 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3812 | int m_has_modinfo;
|
---|
3813 | #endif
|
---|
3814 | char *image;
|
---|
3815 | size_t image_size;
|
---|
3816 | bool mmaped;
|
---|
3817 |
|
---|
3818 | image_size = INT_MAX - 4095;
|
---|
3819 | mmaped = 0;
|
---|
3820 | image = try_to_mmap_module(m_filename, &image_size);
|
---|
3821 | if (image) {
|
---|
3822 | mmaped = 1;
|
---|
3823 | } else {
|
---|
3824 | /* Load module into memory and unzip if compressed */
|
---|
3825 | image = xmalloc_open_zipped_read_close(m_filename, &image_size);
|
---|
3826 | if (!image)
|
---|
3827 | return EXIT_FAILURE;
|
---|
3828 | }
|
---|
3829 |
|
---|
3830 | m_name = xstrdup(bb_basename(m_filename));
|
---|
3831 | /* "module.o[.gz]" -> "module" */
|
---|
3832 | *strchrnul(m_name, '.') = '\0';
|
---|
3833 |
|
---|
3834 | f = obj_load(image, image_size, LOADBITS);
|
---|
3835 |
|
---|
3836 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3837 | /* Version correspondence? */
|
---|
3838 | m_has_modinfo = (get_modinfo_value(f, "kernel_version") != NULL);
|
---|
3839 | if (!flag_quiet) {
|
---|
3840 | char m_strversion[STRVERSIONLEN];
|
---|
3841 | struct utsname uts;
|
---|
3842 |
|
---|
3843 | if (m_has_modinfo) {
|
---|
3844 | int m_version = new_get_module_version(f, m_strversion);
|
---|
3845 | if (m_version == -1) {
|
---|
3846 | bb_error_msg_and_die("can't find the kernel version "
|
---|
3847 | "the module was compiled for");
|
---|
3848 | }
|
---|
3849 | }
|
---|
3850 |
|
---|
3851 | uname(&uts);
|
---|
3852 | if (strncmp(uts.release, m_strversion, STRVERSIONLEN) != 0) {
|
---|
3853 | bb_error_msg("%skernel-module version mismatch\n"
|
---|
3854 | "\t%s was compiled for kernel version %s\n"
|
---|
3855 | "\twhile this kernel is version %s",
|
---|
3856 | flag_force_load ? "warning: " : "",
|
---|
3857 | m_name, m_strversion, uts.release);
|
---|
3858 | if (!flag_force_load)
|
---|
3859 | goto out;
|
---|
3860 | }
|
---|
3861 | }
|
---|
3862 | #endif
|
---|
3863 |
|
---|
3864 | if (query_module(NULL, 0, NULL, 0, NULL))
|
---|
3865 | bb_error_msg_and_die("old (unsupported) kernel");
|
---|
3866 | new_get_kernel_symbols();
|
---|
3867 | k_crcs = new_is_kernel_checksummed();
|
---|
3868 |
|
---|
3869 | #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
|
---|
3870 | {
|
---|
3871 | int m_crcs = 0;
|
---|
3872 | if (m_has_modinfo)
|
---|
3873 | m_crcs = new_is_module_checksummed(f);
|
---|
3874 | if (m_crcs != k_crcs)
|
---|
3875 | obj_set_symbol_compare(f, ncv_strcmp, ncv_symbol_hash);
|
---|
3876 | }
|
---|
3877 | #endif
|
---|
3878 |
|
---|
3879 | /* Let the module know about the kernel symbols. */
|
---|
3880 | add_kernel_symbols(f);
|
---|
3881 |
|
---|
3882 | /* Allocate common symbols, symbol tables, and string tables. */
|
---|
3883 | new_create_this_module(f, m_name);
|
---|
3884 | obj_check_undefineds(f);
|
---|
3885 | obj_allocate_commons(f);
|
---|
3886 | check_tainted_module(f, m_name);
|
---|
3887 |
|
---|
3888 | /* Done with the module name, on to the optional var=value arguments */
|
---|
3889 | new_process_module_arguments(f, options);
|
---|
3890 |
|
---|
3891 | arch_create_got(f);
|
---|
3892 | hide_special_symbols(f);
|
---|
3893 |
|
---|
3894 | #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
|
---|
3895 | add_ksymoops_symbols(f, m_filename, m_name);
|
---|
3896 | #endif
|
---|
3897 |
|
---|
3898 | new_create_module_ksymtab(f);
|
---|
3899 |
|
---|
3900 | /* Find current size of the module */
|
---|
3901 | m_size = obj_load_size(f);
|
---|
3902 |
|
---|
3903 | m_addr = create_module(m_name, m_size);
|
---|
3904 | if (m_addr == (ElfW(Addr))(-1)) switch (errno) {
|
---|
3905 | case EEXIST:
|
---|
3906 | bb_error_msg_and_die("a module named %s already exists", m_name);
|
---|
3907 | case ENOMEM:
|
---|
3908 | bb_error_msg_and_die("can't allocate kernel memory for module; needed %lu bytes",
|
---|
3909 | m_size);
|
---|
3910 | default:
|
---|
3911 | bb_perror_msg_and_die("create_module: %s", m_name);
|
---|
3912 | }
|
---|
3913 |
|
---|
3914 | #if !LOADBITS
|
---|
3915 | /*
|
---|
3916 | * the PROGBITS section was not loaded by the obj_load
|
---|
3917 | * now we can load them directly into the kernel memory
|
---|
3918 | */
|
---|
3919 | if (!obj_load_progbits(image, image_size, f, (char*)m_addr)) {
|
---|
3920 | delete_module(m_name, 0);
|
---|
3921 | goto out;
|
---|
3922 | }
|
---|
3923 | #endif
|
---|
3924 |
|
---|
3925 | if (!obj_relocate(f, m_addr)) {
|
---|
3926 | delete_module(m_name, 0);
|
---|
3927 | goto out;
|
---|
3928 | }
|
---|
3929 |
|
---|
3930 | if (!new_init_module(m_name, f, m_size)) {
|
---|
3931 | delete_module(m_name, 0);
|
---|
3932 | goto out;
|
---|
3933 | }
|
---|
3934 |
|
---|
3935 | if (flag_print_load_map)
|
---|
3936 | print_load_map(f);
|
---|
3937 |
|
---|
3938 | exit_status = EXIT_SUCCESS;
|
---|
3939 |
|
---|
3940 | out:
|
---|
3941 | if (mmaped)
|
---|
3942 | munmap(image, image_size);
|
---|
3943 | else
|
---|
3944 | free(image);
|
---|
3945 | free(m_name);
|
---|
3946 |
|
---|
3947 | return exit_status;
|
---|
3948 | }
|
---|