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5222 | serge | 1 | /* write.h |
2 | Copyright 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001, |
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3 | 2002, 2003, 2005, 2006, 2007 |
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4 | Free Software Foundation, Inc. |
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5 | |||
6 | This file is part of GAS, the GNU Assembler. |
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7 | |||
8 | GAS is free software; you can redistribute it and/or modify |
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9 | it under the terms of the GNU General Public License as published by |
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10 | the Free Software Foundation; either version 3, or (at your option) |
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11 | any later version. |
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12 | |||
13 | GAS is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | GNU General Public License for more details. |
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17 | |||
18 | You should have received a copy of the GNU General Public License |
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19 | along with GAS; see the file COPYING. If not, write to the Free |
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20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
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21 | 02110-1301, USA. */ |
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22 | |||
23 | #ifndef __write_h__ |
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24 | #define __write_h__ |
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25 | |||
26 | /* This is the name of a fake symbol which will never appear in the |
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27 | assembler output. S_IS_LOCAL detects it because of the \001. */ |
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28 | #ifndef FAKE_LABEL_NAME |
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29 | #define FAKE_LABEL_NAME "L0\001" |
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30 | #endif |
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31 | |||
32 | #include "bit_fix.h" |
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33 | |||
34 | /* |
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35 | * FixSs may be built up in any order. |
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36 | */ |
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37 | |||
38 | struct fix |
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39 | { |
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40 | /* These small fields are grouped together for compactness of |
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41 | this structure, and efficiency of access on some architectures. */ |
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42 | |||
43 | /* Is this a pc-relative relocation? */ |
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44 | unsigned fx_pcrel : 1; |
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45 | |||
46 | /* Is this value an immediate displacement? */ |
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47 | /* Only used on ns32k; merge it into TC_FIX_TYPE sometime. */ |
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48 | unsigned fx_im_disp : 2; |
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49 | |||
50 | /* Some bits for the CPU specific code. */ |
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51 | unsigned fx_tcbit : 1; |
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52 | unsigned fx_tcbit2 : 1; |
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53 | |||
54 | /* Has this relocation already been applied? */ |
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55 | unsigned fx_done : 1; |
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56 | |||
57 | /* Suppress overflow complaints on large addends. This is used |
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58 | in the PowerPC ELF config to allow large addends on the |
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59 | BFD_RELOC_{LO16,HI16,HI16_S} relocations. |
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60 | |||
61 | @@ Can this be determined from BFD? */ |
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62 | unsigned fx_no_overflow : 1; |
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63 | |||
64 | /* The value is signed when checking for overflow. */ |
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65 | unsigned fx_signed : 1; |
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66 | |||
67 | /* pc-relative offset adjust (only used by some CPU specific code) */ |
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68 | signed char fx_pcrel_adjust; |
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69 | |||
70 | /* How many bytes are involved? */ |
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71 | unsigned char fx_size; |
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72 | |||
73 | /* Which frag does this fix apply to? */ |
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74 | fragS *fx_frag; |
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75 | |||
76 | /* Where is the first byte to fix up? */ |
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77 | long fx_where; |
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78 | |||
79 | /* NULL or Symbol whose value we add in. */ |
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80 | symbolS *fx_addsy; |
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81 | |||
82 | /* NULL or Symbol whose value we subtract. */ |
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83 | symbolS *fx_subsy; |
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84 | |||
85 | /* Absolute number we add in. */ |
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86 | valueT fx_offset; |
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87 | |||
88 | /* The value of dot when the fixup expression was parsed. */ |
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89 | addressT fx_dot_value; |
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90 | |||
91 | /* The frag fx_dot_value is based on. */ |
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92 | fragS *fx_dot_frag; |
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93 | |||
94 | /* Next fixS in linked list, or NULL. */ |
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95 | struct fix *fx_next; |
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96 | |||
97 | /* If NULL, no bitfix's to do. */ |
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98 | /* Only i960-coff and ns32k use this, and i960-coff stores an |
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99 | integer. This can probably be folded into tc_fix_data, below. |
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100 | @@ Alpha also uses it, but only to disable certain relocation |
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101 | processing. */ |
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102 | bit_fixS *fx_bit_fixP; |
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103 | |||
104 | bfd_reloc_code_real_type fx_r_type; |
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105 | |||
106 | /* This field is sort of misnamed. It appears to be a sort of random |
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107 | scratch field, for use by the back ends. The main gas code doesn't |
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108 | do anything but initialize it to zero. The use of it does need to |
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109 | be coordinated between the cpu and format files, though. E.g., some |
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110 | coff targets pass the `addend' field from the cpu file via this |
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111 | field. I don't know why the `fx_offset' field above can't be used |
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112 | for that; investigate later and document. KR */ |
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113 | valueT fx_addnumber; |
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114 | |||
115 | /* The location of the instruction which created the reloc, used |
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116 | in error messages. */ |
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117 | char *fx_file; |
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118 | unsigned fx_line; |
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119 | |||
120 | #ifdef USING_CGEN |
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121 | struct { |
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122 | /* CGEN_INSN entry for this instruction. */ |
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123 | const struct cgen_insn *insn; |
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124 | /* Target specific data, usually reloc number. */ |
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125 | int opinfo; |
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126 | /* Which ifield this fixup applies to. */ |
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127 | struct cgen_maybe_multi_ifield * field; |
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128 | /* is this field is the MSB field in a set? */ |
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129 | int msb_field_p; |
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130 | } fx_cgen; |
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131 | #endif |
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132 | |||
133 | #ifdef TC_FIX_TYPE |
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134 | /* Location where a backend can attach additional data |
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135 | needed to perform fixups. */ |
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136 | TC_FIX_TYPE tc_fix_data; |
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137 | #endif |
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138 | }; |
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139 | |||
140 | typedef struct fix fixS; |
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141 | |||
142 | struct reloc_list |
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143 | { |
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144 | struct reloc_list *next; |
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145 | union |
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146 | { |
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147 | struct |
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148 | { |
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149 | symbolS *offset_sym; |
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150 | reloc_howto_type *howto; |
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151 | symbolS *sym; |
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152 | bfd_vma addend; |
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153 | } a; |
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154 | struct |
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155 | { |
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156 | asection *sec; |
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157 | asymbol *s; |
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158 | arelent r; |
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159 | } b; |
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160 | } u; |
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161 | char *file; |
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162 | unsigned int line; |
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163 | }; |
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164 | |||
165 | extern int finalize_syms; |
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166 | extern symbolS *abs_section_sym; |
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167 | extern addressT dot_value; |
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168 | extern fragS *dot_frag; |
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169 | extern struct reloc_list* reloc_list; |
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170 | |||
171 | extern void append (char **charPP, char *fromP, unsigned long length); |
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172 | extern void record_alignment (segT seg, int align); |
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173 | extern int get_recorded_alignment (segT seg); |
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174 | extern void subsegs_finish (void); |
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175 | extern void write_object_file (void); |
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176 | extern long relax_frag (segT, fragS *, long); |
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177 | extern int relax_segment (struct frag *, segT, int); |
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178 | extern void number_to_chars_littleendian (char *, valueT, int); |
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179 | extern void number_to_chars_bigendian (char *, valueT, int); |
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180 | extern fixS *fix_new |
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181 | (fragS * frag, int where, int size, symbolS * add_symbol, |
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182 | offsetT offset, int pcrel, bfd_reloc_code_real_type r_type); |
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183 | extern fixS *fix_at_start |
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184 | (fragS * frag, int size, symbolS * add_symbol, |
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185 | offsetT offset, int pcrel, bfd_reloc_code_real_type r_type); |
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186 | extern fixS *fix_new_exp |
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187 | (fragS * frag, int where, int size, expressionS *exp, int pcrel, |
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188 | bfd_reloc_code_real_type r_type); |
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189 | extern void write_print_statistics (FILE *); |
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190 | |||
191 | #endif /* __write_h__ */ |