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Rev | Author | Line No. | Line |
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5197 | serge | 1 | /* BFD support for the Intel 386 architecture. |
6324 | serge | 2 | Copyright (C) 1992-2015 Free Software Foundation, Inc. |
5197 | serge | 3 | |
4 | This file is part of BFD, the Binary File Descriptor library. |
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5 | |||
6 | This program is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 3 of the License, or |
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9 | (at your option) any later version. |
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10 | |||
11 | This program is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |||
16 | You should have received a copy of the GNU General Public License |
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17 | along with this program; if not, write to the Free Software |
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18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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19 | MA 02110-1301, USA. */ |
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20 | |||
21 | #include "sysdep.h" |
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22 | #include "bfd.h" |
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23 | #include "libbfd.h" |
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24 | #include "libiberty.h" |
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25 | |||
26 | extern void * bfd_arch_i386_short_nop_fill (bfd_size_type, bfd_boolean, |
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27 | bfd_boolean); |
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28 | |||
29 | static const bfd_arch_info_type * |
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30 | bfd_i386_compatible (const bfd_arch_info_type *a, |
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31 | const bfd_arch_info_type *b) |
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32 | { |
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33 | const bfd_arch_info_type *compat = bfd_default_compatible (a, b); |
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34 | |||
35 | /* Don't allow mixing x64_32 with x86_64. */ |
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36 | if (compat |
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37 | && (a->mach & bfd_mach_x64_32) != (b->mach & bfd_mach_x64_32)) |
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38 | compat = NULL; |
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39 | |||
40 | return compat; |
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41 | } |
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42 | |||
43 | /* Fill the buffer with zero or nop instruction if CODE is TRUE. Use |
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44 | multi byte nop instructions if LONG_NOP is TRUE. */ |
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45 | |||
46 | static void * |
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47 | bfd_arch_i386_fill (bfd_size_type count, bfd_boolean code, |
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48 | bfd_boolean long_nop) |
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49 | { |
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50 | /* nop */ |
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51 | static const char nop_1[] = { 0x90 }; |
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52 | /* xchg %ax,%ax */ |
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53 | static const char nop_2[] = { 0x66, 0x90 }; |
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54 | /* nopl (%[re]ax) */ |
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55 | static const char nop_3[] = { 0x0f, 0x1f, 0x00 }; |
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56 | /* nopl 0(%[re]ax) */ |
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57 | static const char nop_4[] = { 0x0f, 0x1f, 0x40, 0x00 }; |
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58 | /* nopl 0(%[re]ax,%[re]ax,1) */ |
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59 | static const char nop_5[] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
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60 | /* nopw 0(%[re]ax,%[re]ax,1) */ |
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61 | static const char nop_6[] = { 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
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62 | /* nopl 0L(%[re]ax) */ |
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63 | static const char nop_7[] = { 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00 }; |
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64 | /* nopl 0L(%[re]ax,%[re]ax,1) */ |
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65 | static const char nop_8[] = |
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66 | { 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00}; |
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67 | /* nopw 0L(%[re]ax,%[re]ax,1) */ |
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68 | static const char nop_9[] = |
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69 | { 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
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70 | /* nopw %cs:0L(%[re]ax,%[re]ax,1) */ |
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71 | static const char nop_10[] = |
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72 | { 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
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73 | static const char *const nops[] = |
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74 | { nop_1, nop_2, nop_3, nop_4, nop_5, |
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75 | nop_6, nop_7, nop_8, nop_9, nop_10 }; |
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76 | bfd_size_type nop_size = long_nop ? ARRAY_SIZE (nops) : 2; |
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77 | |||
78 | void *fill = bfd_malloc (count); |
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79 | if (fill == NULL) |
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80 | return fill; |
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81 | |||
82 | if (code) |
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83 | { |
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84 | bfd_byte *p = fill; |
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85 | while (count >= nop_size) |
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86 | { |
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87 | memcpy (p, nops[nop_size - 1], nop_size); |
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88 | p += nop_size; |
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89 | count -= nop_size; |
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90 | } |
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91 | if (count != 0) |
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92 | memcpy (p, nops[count - 1], count); |
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93 | } |
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94 | else |
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95 | memset (fill, 0, count); |
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96 | |||
97 | return fill; |
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98 | } |
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99 | |||
100 | /* Fill the buffer with zero or short nop instruction if CODE is TRUE. */ |
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101 | |||
102 | void * |
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103 | bfd_arch_i386_short_nop_fill (bfd_size_type count, |
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104 | bfd_boolean is_bigendian ATTRIBUTE_UNUSED, |
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105 | bfd_boolean code) |
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106 | { |
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107 | return bfd_arch_i386_fill (count, code, FALSE); |
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108 | } |
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109 | |||
110 | /* Fill the buffer with zero or long nop instruction if CODE is TRUE. */ |
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111 | |||
112 | static void * |
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113 | bfd_arch_i386_long_nop_fill (bfd_size_type count, |
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114 | bfd_boolean is_bigendian ATTRIBUTE_UNUSED, |
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115 | bfd_boolean code) |
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116 | { |
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117 | return bfd_arch_i386_fill (count, code, TRUE); |
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118 | } |
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119 | |||
120 | /* Fill the buffer with zero, or one-byte nop instructions if CODE is TRUE. */ |
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121 | |||
122 | static void * |
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123 | bfd_arch_i386_onebyte_nop_fill (bfd_size_type count, |
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124 | bfd_boolean is_bigendian ATTRIBUTE_UNUSED, |
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125 | bfd_boolean code) |
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126 | { |
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127 | void *fill = bfd_malloc (count); |
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128 | if (fill != NULL) |
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129 | memset (fill, code ? 0x90 : 0, count); |
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130 | return fill; |
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131 | } |
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132 | |||
133 | |||
134 | static const bfd_arch_info_type bfd_x64_32_nacl_arch = |
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135 | { |
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136 | 64, /* 64 bits in a word */ |
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137 | 64, /* 64 bits in an address */ |
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138 | 8, /* 8 bits in a byte */ |
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139 | bfd_arch_i386, |
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140 | bfd_mach_x64_32_nacl, |
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141 | "i386", |
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142 | "i386:x64-32:nacl", |
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143 | 3, |
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144 | FALSE, |
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145 | bfd_i386_compatible, |
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146 | bfd_default_scan, |
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147 | bfd_arch_i386_onebyte_nop_fill, |
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148 | NULL |
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149 | }; |
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150 | |||
151 | static const bfd_arch_info_type bfd_x86_64_nacl_arch = |
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152 | { |
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153 | 64, /* 64 bits in a word */ |
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154 | 64, /* 64 bits in an address */ |
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155 | 8, /* 8 bits in a byte */ |
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156 | bfd_arch_i386, |
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157 | bfd_mach_x86_64_nacl, |
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158 | "i386", |
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159 | "i386:x86-64:nacl", |
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160 | 3, |
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161 | FALSE, |
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162 | bfd_i386_compatible, |
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163 | bfd_default_scan, |
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164 | bfd_arch_i386_onebyte_nop_fill, |
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165 | &bfd_x64_32_nacl_arch |
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166 | }; |
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167 | |||
168 | const bfd_arch_info_type bfd_i386_nacl_arch = |
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169 | { |
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170 | 32, /* 32 bits in a word */ |
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171 | 32, /* 32 bits in an address */ |
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172 | 8, /* 8 bits in a byte */ |
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173 | bfd_arch_i386, |
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174 | bfd_mach_i386_i386_nacl, |
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175 | "i386", |
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176 | "i386:nacl", |
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177 | 3, |
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178 | TRUE, |
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179 | bfd_i386_compatible, |
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180 | bfd_default_scan, |
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181 | bfd_arch_i386_onebyte_nop_fill, |
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182 | &bfd_x86_64_nacl_arch |
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183 | }; |
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184 | |||
185 | static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax = |
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186 | { |
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187 | 64, /* 64 bits in a word */ |
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188 | 64, /* 64 bits in an address */ |
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189 | 8, /* 8 bits in a byte */ |
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190 | bfd_arch_i386, |
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191 | bfd_mach_x64_32_intel_syntax, |
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192 | "i386:intel", |
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193 | "i386:x64-32:intel", |
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194 | 3, |
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195 | FALSE, |
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196 | bfd_i386_compatible, |
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197 | bfd_default_scan, |
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198 | bfd_arch_i386_long_nop_fill, |
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199 | &bfd_i386_nacl_arch |
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200 | }; |
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201 | |||
202 | static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax = |
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203 | { |
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204 | 64, /* 64 bits in a word */ |
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205 | 64, /* 64 bits in an address */ |
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206 | 8, /* 8 bits in a byte */ |
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207 | bfd_arch_i386, |
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208 | bfd_mach_x86_64_intel_syntax, |
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209 | "i386:intel", |
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210 | "i386:x86-64:intel", |
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211 | 3, |
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212 | FALSE, |
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213 | bfd_i386_compatible, |
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214 | bfd_default_scan, |
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215 | bfd_arch_i386_long_nop_fill, |
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216 | &bfd_x64_32_arch_intel_syntax, |
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217 | }; |
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218 | |||
219 | static const bfd_arch_info_type bfd_i386_arch_intel_syntax = |
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220 | { |
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221 | 32, /* 32 bits in a word */ |
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222 | 32, /* 32 bits in an address */ |
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223 | 8, /* 8 bits in a byte */ |
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224 | bfd_arch_i386, |
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225 | bfd_mach_i386_i386_intel_syntax, |
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226 | "i386:intel", |
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227 | "i386:intel", |
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228 | 3, |
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229 | TRUE, |
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230 | bfd_i386_compatible, |
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231 | bfd_default_scan, |
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232 | bfd_arch_i386_short_nop_fill, |
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233 | &bfd_x86_64_arch_intel_syntax |
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234 | }; |
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235 | |||
236 | static const bfd_arch_info_type i8086_arch = |
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237 | { |
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238 | 32, /* 32 bits in a word */ |
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239 | 32, /* 32 bits in an address (well, not really) */ |
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240 | 8, /* 8 bits in a byte */ |
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241 | bfd_arch_i386, |
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242 | bfd_mach_i386_i8086, |
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243 | "i8086", |
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244 | "i8086", |
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245 | 3, |
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246 | FALSE, |
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247 | bfd_i386_compatible, |
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248 | bfd_default_scan, |
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249 | bfd_arch_i386_short_nop_fill, |
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250 | &bfd_i386_arch_intel_syntax |
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251 | }; |
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252 | |||
253 | static const bfd_arch_info_type bfd_x64_32_arch = |
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254 | { |
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255 | 64, /* 64 bits in a word */ |
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256 | 64, /* 64 bits in an address */ |
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257 | 8, /* 8 bits in a byte */ |
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258 | bfd_arch_i386, |
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259 | bfd_mach_x64_32, |
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260 | "i386", |
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261 | "i386:x64-32", |
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262 | 3, |
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263 | FALSE, |
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264 | bfd_i386_compatible, |
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265 | bfd_default_scan, |
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266 | bfd_arch_i386_long_nop_fill, |
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267 | &i8086_arch |
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268 | }; |
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269 | |||
270 | static const bfd_arch_info_type bfd_x86_64_arch = |
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271 | { |
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272 | 64, /* 64 bits in a word */ |
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273 | 64, /* 64 bits in an address */ |
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274 | 8, /* 8 bits in a byte */ |
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275 | bfd_arch_i386, |
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276 | bfd_mach_x86_64, |
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277 | "i386", |
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278 | "i386:x86-64", |
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279 | 3, |
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280 | FALSE, |
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281 | bfd_i386_compatible, |
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282 | bfd_default_scan, |
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283 | bfd_arch_i386_long_nop_fill, |
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284 | &bfd_x64_32_arch |
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285 | }; |
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286 | |||
287 | const bfd_arch_info_type bfd_i386_arch = |
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288 | { |
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289 | 32, /* 32 bits in a word */ |
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290 | 32, /* 32 bits in an address */ |
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291 | 8, /* 8 bits in a byte */ |
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292 | bfd_arch_i386, |
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293 | bfd_mach_i386_i386, |
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294 | "i386", |
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295 | "i386", |
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296 | 3, |
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297 | TRUE, |
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298 | bfd_i386_compatible, |
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299 | bfd_default_scan, |
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300 | bfd_arch_i386_short_nop_fill, |
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301 | &bfd_x86_64_arch |
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302 | }; |