1 /* write.h 2 Copyright (C) 1987-2014 Free Software Foundation, Inc. 3 4 This file is part of GAS, the GNU Assembler. 5 6 GAS is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GAS is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GAS; see the file COPYING. If not, write to the Free 18 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 19 02110-1301, USA. */ 20 21 #ifndef __write_h__ 22 #define __write_h__ 23 24 /* This is the name of a fake symbol which will never appear in the 25 assembler output. S_IS_LOCAL detects it because of the \001. */ 26 #ifndef FAKE_LABEL_NAME 27 #define FAKE_LABEL_NAME "L0\001" 28 #endif 29 30 #include "bit_fix.h" 31 32 /* 33 * FixSs may be built up in any order. 34 */ 35 36 struct fix 37 { 38 /* These small fields are grouped together for compactness of 39 this structure, and efficiency of access on some architectures. */ 40 41 /* Is this a pc-relative relocation? */ 42 unsigned fx_pcrel : 1; 43 44 /* Is this value an immediate displacement? */ 45 /* Only used on ns32k; merge it into TC_FIX_TYPE sometime. */ 46 unsigned fx_im_disp : 2; 47 48 /* Some bits for the CPU specific code. */ 49 unsigned fx_tcbit : 1; 50 unsigned fx_tcbit2 : 1; 51 52 /* Has this relocation already been applied? */ 53 unsigned fx_done : 1; 54 55 /* Suppress overflow complaints on large addends. This is used 56 in the PowerPC ELF config to allow large addends on the 57 BFD_RELOC_{LO16,HI16,HI16_S} relocations. 58 59 @@ Can this be determined from BFD? */ 60 unsigned fx_no_overflow : 1; 61 62 /* The value is signed when checking for overflow. */ 63 unsigned fx_signed : 1; 64 65 /* pc-relative offset adjust (only used by some CPU specific code) */ 66 signed char fx_pcrel_adjust; 67 68 /* How many bytes are involved? */ 69 unsigned char fx_size; 70 71 /* Which frag does this fix apply to? */ 72 fragS *fx_frag; 73 74 /* Where is the first byte to fix up? */ 75 long fx_where; 76 77 /* NULL or Symbol whose value we add in. */ 78 symbolS *fx_addsy; 79 80 /* NULL or Symbol whose value we subtract. */ 81 symbolS *fx_subsy; 82 83 /* Absolute number we add in. */ 84 valueT fx_offset; 85 86 /* The value of dot when the fixup expression was parsed. */ 87 addressT fx_dot_value; 88 89 /* The frag fx_dot_value is based on. */ 90 fragS *fx_dot_frag; 91 92 /* Next fixS in linked list, or NULL. */ 93 struct fix *fx_next; 94 95 /* If NULL, no bitfix's to do. */ 96 /* Only i960-coff and ns32k use this, and i960-coff stores an 97 integer. This can probably be folded into tc_fix_data, below. 98 @@ Alpha also uses it, but only to disable certain relocation 99 processing. */ 100 bit_fixS *fx_bit_fixP; 101 102 bfd_reloc_code_real_type fx_r_type; 103 104 /* This field is sort of misnamed. It appears to be a sort of random 105 scratch field, for use by the back ends. The main gas code doesn't 106 do anything but initialize it to zero. The use of it does need to 107 be coordinated between the cpu and format files, though. E.g., some 108 coff targets pass the `addend' field from the cpu file via this 109 field. I don't know why the `fx_offset' field above can't be used 110 for that; investigate later and document. KR */ 111 valueT fx_addnumber; 112 113 /* The location of the instruction which created the reloc, used 114 in error messages. */ 115 char *fx_file; 116 unsigned fx_line; 117 118 #ifdef USING_CGEN 119 struct { 120 /* CGEN_INSN entry for this instruction. */ 121 const struct cgen_insn *insn; 122 /* Target specific data, usually reloc number. */ 123 int opinfo; 124 /* Which ifield this fixup applies to. */ 125 struct cgen_maybe_multi_ifield * field; 126 /* is this field is the MSB field in a set? */ 127 int msb_field_p; 128 } fx_cgen; 129 #endif 130 131 #ifdef TC_FIX_TYPE 132 /* Location where a backend can attach additional data 133 needed to perform fixups. */ 134 TC_FIX_TYPE tc_fix_data; 135 #endif 136 }; 137 138 typedef struct fix fixS; 139 140 struct reloc_list 141 { 142 struct reloc_list *next; 143 union 144 { 145 struct 146 { 147 symbolS *offset_sym; 148 reloc_howto_type *howto; 149 symbolS *sym; 150 bfd_vma addend; 151 } a; 152 struct 153 { 154 asection *sec; 155 asymbol *s; 156 arelent r; 157 } b; 158 } u; 159 char *file; 160 unsigned int line; 161 }; 162 163 extern int finalize_syms; 164 extern symbolS *abs_section_sym; 165 extern addressT dot_value; 166 extern fragS *dot_frag; 167 extern struct reloc_list* reloc_list; 168 169 extern void append (char **charPP, char *fromP, unsigned long length); 170 extern void record_alignment (segT seg, int align); 171 extern int get_recorded_alignment (segT seg); 172 extern void write_object_file (void); 173 extern long relax_frag (segT, fragS *, long); 174 extern int relax_segment (struct frag *, segT, int); 175 extern void number_to_chars_littleendian (char *, valueT, int); 176 extern void number_to_chars_bigendian (char *, valueT, int); 177 extern fixS *fix_new 178 (fragS * frag, int where, int size, symbolS * add_symbol, 179 offsetT offset, int pcrel, bfd_reloc_code_real_type r_type); 180 extern fixS *fix_at_start 181 (fragS * frag, int size, symbolS * add_symbol, 182 offsetT offset, int pcrel, bfd_reloc_code_real_type r_type); 183 extern fixS *fix_new_exp 184 (fragS * frag, int where, int size, expressionS *exp, int pcrel, 185 bfd_reloc_code_real_type r_type); 186 extern void write_print_statistics (FILE *); 187 188 #endif /* __write_h__ */ 189