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Rev | Author | Line No. | Line |
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5191 | serge | 1 | /* `a.out.adobe' differences from standard a.out files |
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6324 | serge | 3 | Copyright (C) 2001-2015 Free Software Foundation, Inc. |
5191 | serge | 4 | |
5 | This program is free software; you can redistribute it and/or modify |
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6 | it under the terms of the GNU General Public License as published by |
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7 | the Free Software Foundation; either version 3 of the License, or |
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8 | (at your option) any later version. |
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9 | |||
10 | This program is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | GNU General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software |
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17 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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18 | MA 02110-1301, USA. */ |
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19 | |||
20 | #ifndef __A_OUT_ADOBE_H__ |
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21 | #define __A_OUT_ADOBE_H__ |
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22 | |||
23 | #define BYTES_IN_WORD 4 |
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24 | |||
25 | /* Struct external_exec is the same. */ |
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26 | |||
27 | /* This is the layout on disk of the 32-bit or 64-bit exec header. */ |
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28 | |||
29 | struct external_exec |
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30 | { |
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31 | bfd_byte e_info[4]; /* magic number and stuff */ |
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32 | bfd_byte e_text[BYTES_IN_WORD]; /* length of text section in bytes */ |
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33 | bfd_byte e_data[BYTES_IN_WORD]; /* length of data section in bytes */ |
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34 | bfd_byte e_bss[BYTES_IN_WORD]; /* length of bss area in bytes */ |
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35 | bfd_byte e_syms[BYTES_IN_WORD]; /* length of symbol table in bytes */ |
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36 | bfd_byte e_entry[BYTES_IN_WORD]; /* start address */ |
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37 | bfd_byte e_trsize[BYTES_IN_WORD]; /* length of text relocation info */ |
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38 | bfd_byte e_drsize[BYTES_IN_WORD]; /* length of data relocation info */ |
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39 | }; |
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40 | |||
41 | #define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7) |
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42 | |||
43 | /* Magic numbers for a.out files */ |
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44 | |||
45 | #undef ZMAGIC |
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46 | #define ZMAGIC 0xAD0BE /* Cute, eh? */ |
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47 | #undef OMAGIC |
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48 | #undef NMAGIC |
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49 | |||
50 | #define N_BADMAG(x) ((x).a_info != ZMAGIC) |
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51 | |||
52 | /* By default, segment size is constant. But some machines override this |
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53 | to be a function of the a.out header (e.g. machine type). */ |
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54 | #ifndef N_SEGSIZE |
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55 | #define N_SEGSIZE(x) SEGMENT_SIZE |
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56 | #endif |
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57 | #undef N_SEGSIZE /* FIXMEXXXX */ |
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58 | |||
59 | /* Segment information for the a.out.Adobe format is specified after the |
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60 | file header. It contains N segment descriptors, followed by one with |
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61 | a type of zero. |
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62 | |||
63 | The actual text of the segments starts at N_TXTOFF in the file, |
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64 | regardless of how many or how few segment headers there are. */ |
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65 | |||
66 | struct external_segdesc { |
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67 | unsigned char e_type[1]; |
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68 | unsigned char e_size[3]; |
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69 | unsigned char e_virtbase[4]; |
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70 | unsigned char e_filebase[4]; |
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71 | }; |
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72 | |||
73 | struct internal_segdesc { |
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74 | unsigned int a_type:8; /* Segment type N_TEXT, N_DATA, 0 */ |
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75 | unsigned int a_size:24; /* Segment size */ |
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76 | bfd_vma a_virtbase; /* Virtual address */ |
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77 | unsigned int a_filebase; /* Base address in object file */ |
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78 | }; |
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79 | |||
80 | #define N_TXTADDR(x) \ |
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81 | |||
82 | /* This is documented to be at 1024, but appears to really be at 2048. |
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83 | FIXME?! */ |
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84 | #define N_TXTOFF(x) 2048 |
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85 | |||
86 | #define N_TXTSIZE(x) ((x).a_text) |
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87 | |||
88 | #define N_DATADDR(x) |
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89 | |||
90 | #define N_BSSADDR(x) |
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91 | |||
92 | /* Offsets of the various portions of the file after the text segment. */ |
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93 | |||
94 | #define N_DATOFF(x) ( N_TXTOFF(x) + N_TXTSIZE(x) ) |
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95 | #define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data ) |
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96 | #define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize ) |
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97 | #define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize ) |
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98 | #define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms ) |
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99 | |||
100 | /* Symbols */ |
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101 | struct external_nlist { |
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102 | bfd_byte e_strx[BYTES_IN_WORD]; /* index into string table of name */ |
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103 | bfd_byte e_type[1]; /* type of symbol */ |
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104 | bfd_byte e_other[1]; /* misc info (usually empty) */ |
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105 | bfd_byte e_desc[2]; /* description field */ |
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106 | bfd_byte e_value[BYTES_IN_WORD]; /* value of symbol */ |
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107 | }; |
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108 | |||
109 | #define EXTERNAL_NLIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD) |
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110 | |||
111 | struct internal_nlist { |
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112 | unsigned long n_strx; /* index into string table of name */ |
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113 | unsigned char n_type; /* type of symbol */ |
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114 | unsigned char n_other; /* misc info (usually empty) */ |
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115 | unsigned short n_desc; /* description field */ |
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116 | bfd_vma n_value; /* value of symbol */ |
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117 | }; |
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118 | |||
119 | /* The n_type field is the symbol type, containing: */ |
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120 | |||
121 | #define N_UNDF 0 /* Undefined symbol */ |
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122 | #define N_ABS 2 /* Absolute symbol -- defined at particular addr */ |
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123 | #define N_TEXT 4 /* Text sym -- defined at offset in text seg */ |
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124 | #define N_DATA 6 /* Data sym -- defined at offset in data seg */ |
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125 | #define N_BSS 8 /* BSS sym -- defined at offset in zero'd seg */ |
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126 | #define N_COMM 0x12 /* Common symbol (visible after shared lib dynlink) */ |
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127 | #define N_FN 0x1f /* File name of .o file */ |
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128 | #define N_FN_SEQ 0x0C /* N_FN from Sequent compilers (sigh) */ |
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129 | /* Note: N_EXT can only be usefully OR-ed with N_UNDF, N_ABS, N_TEXT, |
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130 | N_DATA, or N_BSS. When the low-order bit of other types is set, |
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131 | (e.g. N_WARNING versus N_FN), they are two different types. */ |
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132 | #define N_EXT 1 /* External symbol (as opposed to local-to-this-file) */ |
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133 | #define N_TYPE 0x1e |
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134 | #define N_STAB 0xe0 /* If any of these bits are on, it's a debug symbol */ |
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135 | |||
136 | #define N_INDR 0x0a |
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137 | |||
138 | /* The following symbols refer to set elements. |
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139 | All the N_SET[ATDB] symbols with the same name form one set. |
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140 | Space is allocated for the set in the text section, and each set |
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141 | elements value is stored into one word of the space. |
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142 | The first word of the space is the length of the set (number of elements). |
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143 | |||
144 | The address of the set is made into an N_SETV symbol |
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145 | whose name is the same as the name of the set. |
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146 | This symbol acts like a N_DATA global symbol |
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147 | in that it can satisfy undefined external references. */ |
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148 | |||
149 | /* These appear as input to LD, in a .o file. */ |
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150 | #define N_SETA 0x14 /* Absolute set element symbol */ |
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151 | #define N_SETT 0x16 /* Text set element symbol */ |
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152 | #define N_SETD 0x18 /* Data set element symbol */ |
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153 | #define N_SETB 0x1A /* Bss set element symbol */ |
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154 | |||
155 | /* This is output from LD. */ |
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156 | #define N_SETV 0x1C /* Pointer to set vector in data area. */ |
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157 | |||
158 | /* Warning symbol. The text gives a warning message, the next symbol |
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159 | in the table will be undefined. When the symbol is referenced, the |
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160 | message is printed. */ |
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161 | |||
162 | #define N_WARNING 0x1e |
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163 | |||
164 | /* Relocations |
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165 | |||
166 | There are two types of relocation flavours for a.out systems, |
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167 | standard and extended. The standard form is used on systems where the |
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168 | instruction has room for all the bits of an offset to the operand, whilst |
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169 | the extended form is used when an address operand has to be split over n |
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170 | instructions. Eg, on the 68k, each move instruction can reference |
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171 | the target with a displacement of 16 or 32 bits. On the sparc, move |
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172 | instructions use an offset of 14 bits, so the offset is stored in |
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173 | the reloc field, and the data in the section is ignored. |
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174 | */ |
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175 | |||
176 | /* This structure describes a single relocation to be performed. |
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177 | The text-relocation section of the file is a vector of these structures, |
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178 | all of which apply to the text section. |
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179 | Likewise, the data-relocation section applies to the data section. */ |
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180 | |||
181 | struct reloc_std_external { |
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182 | bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */ |
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183 | bfd_byte r_index[3]; /* symbol table index of symbol */ |
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184 | bfd_byte r_type[1]; /* relocation type */ |
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185 | }; |
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186 | |||
187 | #define RELOC_STD_BITS_PCREL_BIG 0x80 |
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188 | #define RELOC_STD_BITS_PCREL_LITTLE 0x01 |
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189 | |||
190 | #define RELOC_STD_BITS_LENGTH_BIG 0x60 |
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191 | #define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */ |
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192 | #define RELOC_STD_BITS_LENGTH_LITTLE 0x06 |
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193 | #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1 |
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194 | |||
195 | #define RELOC_STD_BITS_EXTERN_BIG 0x10 |
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196 | #define RELOC_STD_BITS_EXTERN_LITTLE 0x08 |
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197 | |||
198 | #define RELOC_STD_BITS_BASEREL_BIG 0x08 |
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199 | #define RELOC_STD_BITS_BASEREL_LITTLE 0x08 |
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200 | |||
201 | #define RELOC_STD_BITS_JMPTABLE_BIG 0x04 |
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202 | #define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04 |
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203 | |||
204 | #define RELOC_STD_BITS_RELATIVE_BIG 0x02 |
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205 | #define RELOC_STD_BITS_RELATIVE_LITTLE 0x02 |
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206 | |||
207 | #define RELOC_STD_SIZE (BYTES_IN_WORD + 3 + 1) /* Bytes per relocation entry */ |
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208 | |||
209 | struct reloc_std_internal |
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210 | { |
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211 | bfd_vma r_address; /* Address (within segment) to be relocated. */ |
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212 | /* The meaning of r_symbolnum depends on r_extern. */ |
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213 | unsigned int r_symbolnum:24; |
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214 | /* Nonzero means value is a pc-relative offset |
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215 | and it should be relocated for changes in its own address |
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216 | as well as for changes in the symbol or section specified. */ |
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217 | unsigned int r_pcrel:1; |
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218 | /* Length (as exponent of 2) of the field to be relocated. |
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219 | Thus, a value of 2 indicates 1<<2 bytes. */ |
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220 | unsigned int r_length:2; |
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221 | /* 1 => relocate with value of symbol. |
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222 | r_symbolnum is the index of the symbol |
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223 | in files the symbol table. |
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224 | |||
225 | r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS |
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226 | (the N_EXT bit may be set also, but signifies nothing). */ |
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227 | unsigned int r_extern:1; |
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228 | /* The next three bits are for SunOS shared libraries, and seem to |
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229 | be undocumented. */ |
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230 | unsigned int r_baserel:1; /* Linkage table relative */ |
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231 | unsigned int r_jmptable:1; /* pc-relative to jump table */ |
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232 | unsigned int r_relative:1; /* "relative relocation" */ |
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233 | /* unused */ |
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234 | unsigned int r_pad:1; /* Padding -- set to zero */ |
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235 | }; |
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236 | |||
237 | |||
238 | /* EXTENDED RELOCS */ |
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239 | |||
240 | struct reloc_ext_external { |
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241 | bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */ |
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242 | bfd_byte r_index[3]; /* symbol table index of symbol */ |
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243 | bfd_byte r_type[1]; /* relocation type */ |
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244 | bfd_byte r_addend[BYTES_IN_WORD]; /* datum addend */ |
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245 | }; |
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246 | |||
247 | #define RELOC_EXT_BITS_EXTERN_BIG 0x80 |
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248 | #define RELOC_EXT_BITS_EXTERN_LITTLE 0x01 |
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249 | |||
250 | #define RELOC_EXT_BITS_TYPE_BIG 0x1F |
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251 | #define RELOC_EXT_BITS_TYPE_SH_BIG 0 |
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252 | #define RELOC_EXT_BITS_TYPE_LITTLE 0xF8 |
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253 | #define RELOC_EXT_BITS_TYPE_SH_LITTLE 3 |
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254 | |||
255 | /* Bytes per relocation entry */ |
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256 | #define RELOC_EXT_SIZE (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD) |
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257 | |||
258 | enum reloc_type |
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259 | { |
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260 | /* simple relocations */ |
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261 | RELOC_8, /* data[0:7] = addend + sv */ |
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262 | RELOC_16, /* data[0:15] = addend + sv */ |
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263 | RELOC_32, /* data[0:31] = addend + sv */ |
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264 | /* pc-rel displacement */ |
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265 | RELOC_DISP8, /* data[0:7] = addend - pc + sv */ |
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266 | RELOC_DISP16, /* data[0:15] = addend - pc + sv */ |
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267 | RELOC_DISP32, /* data[0:31] = addend - pc + sv */ |
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268 | /* Special */ |
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269 | RELOC_WDISP30, /* data[0:29] = (addend + sv - pc)>>2 */ |
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270 | RELOC_WDISP22, /* data[0:21] = (addend + sv - pc)>>2 */ |
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271 | RELOC_HI22, /* data[0:21] = (addend + sv)>>10 */ |
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272 | RELOC_22, /* data[0:21] = (addend + sv) */ |
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273 | RELOC_13, /* data[0:12] = (addend + sv) */ |
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274 | RELOC_LO10, /* data[0:9] = (addend + sv) */ |
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275 | RELOC_SFA_BASE, |
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276 | RELOC_SFA_OFF13, |
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277 | /* P.I.C. (base-relative) */ |
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278 | RELOC_BASE10, /* Not sure - maybe we can do this the */ |
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279 | RELOC_BASE13, /* right way now */ |
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280 | RELOC_BASE22, |
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281 | /* for some sort of pc-rel P.I.C. (?) */ |
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282 | RELOC_PC10, |
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283 | RELOC_PC22, |
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284 | /* P.I.C. jump table */ |
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285 | RELOC_JMP_TBL, |
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286 | /* reputedly for shared libraries somehow */ |
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287 | RELOC_SEGOFF16, |
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288 | RELOC_GLOB_DAT, |
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289 | RELOC_JMP_SLOT, |
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290 | RELOC_RELATIVE, |
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291 | |||
292 | RELOC_11, |
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293 | RELOC_WDISP2_14, |
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294 | RELOC_WDISP19, |
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295 | RELOC_HHI22, /* data[0:21] = (addend + sv) >> 42 */ |
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296 | RELOC_HLO10, /* data[0:9] = (addend + sv) >> 32 */ |
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297 | |||
298 | /* 29K relocation types */ |
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299 | RELOC_JUMPTARG, |
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300 | RELOC_CONST, |
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301 | RELOC_CONSTH, |
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302 | |||
303 | NO_RELOC |
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304 | }; |
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305 | |||
306 | |||
307 | struct reloc_internal { |
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308 | bfd_vma r_address; /* offset of of data to relocate */ |
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309 | long r_index; /* symbol table index of symbol */ |
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310 | enum reloc_type r_type; /* relocation type */ |
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311 | bfd_vma r_addend; /* datum addend */ |
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312 | }; |
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313 | |||
314 | #endif /* __A_OUT_ADOBE_H__ */2><2> |