1/* write.h 2 Copyright (C) 1987-2020 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/* This is a special character that is used to indicate a fake label. 31 It must be present in FAKE_LABEL_NAME, although it does not have to 32 be the first character. It must not be a character that would be 33 found in a valid symbol name. 34 35 Also be aware that the function _bfd_elf_is_local_label_name in 36 bfd/elf.c has an implicit assumption that FAKE_LABEL_CHAR is '\001'. 37 If this is not the case then FAKE_LABEL_NAME must start with ".L" in 38 order for the function to continue working. */ 39#ifndef FAKE_LABEL_CHAR 40#define FAKE_LABEL_CHAR '\001' 41#endif 42 43/* 44 * FixSs may be built up in any order. 45 */ 46 47struct fix 48{ 49 /* Next fixS in linked list, or NULL. */ 50 struct fix *fx_next; 51 52 /* These small fields are grouped together for compactness of 53 this structure, and efficiency of access on some architectures. */ 54 55 /* Is this a pc-relative relocation? */ 56 unsigned fx_pcrel : 1; 57 58 /* Has this relocation already been applied? */ 59 unsigned fx_done : 1; 60 61 /* Suppress overflow complaints on large addends. This is used 62 in the PowerPC ELF config to allow large addends on the 63 BFD_RELOC_{LO16,HI16,HI16_S} relocations. 64 65 @@ Can this be determined from BFD? */ 66 unsigned fx_no_overflow : 1; 67 68 /* The value is signed when checking for overflow. */ 69 unsigned fx_signed : 1; 70 71 /* Some bits for the CPU specific code. */ 72 unsigned fx_tcbit : 1; 73 unsigned fx_tcbit2 : 1; 74 75 /* Spare bits. */ 76 unsigned fx_unused : 10; 77 78 /* pc-relative offset adjust (only used by some CPU specific code) */ 79 int fx_pcrel_adjust : 8; 80 81 /* How many bytes are involved? */ 82 unsigned fx_size : 8; 83 84 bfd_reloc_code_real_type fx_r_type; 85 86 /* Which frag does this fix apply to? */ 87 fragS *fx_frag; 88 89 /* The location within the frag where the fixup occurs. */ 90 unsigned long fx_where; 91 92 /* NULL or Symbol whose value we add in. */ 93 symbolS *fx_addsy; 94 95 /* NULL or Symbol whose value we subtract. */ 96 symbolS *fx_subsy; 97 98 /* Absolute number we add in. */ 99 valueT fx_offset; 100 101 /* The value of dot when the fixup expression was parsed. */ 102 addressT fx_dot_value; 103 104 /* The frag fx_dot_value is based on. */ 105 fragS *fx_dot_frag; 106 107 /* This field is sort of misnamed. It appears to be a sort of random 108 scratch field, for use by the back ends. The main gas code doesn't 109 do anything but initialize it to zero. The use of it does need to 110 be coordinated between the cpu and format files, though. E.g., some 111 coff targets pass the `addend' field from the cpu file via this 112 field. I don't know why the `fx_offset' field above can't be used 113 for that; investigate later and document. KR */ 114 valueT fx_addnumber; 115 116 /* The location of the instruction which created the reloc, used 117 in error messages. */ 118 const char *fx_file; 119 unsigned fx_line; 120 121#ifdef USING_CGEN 122 struct { 123 /* CGEN_INSN entry for this instruction. */ 124 const struct cgen_insn *insn; 125 /* Target specific data, usually reloc number. */ 126 int opinfo; 127 /* Which ifield this fixup applies to. */ 128 struct cgen_maybe_multi_ifield * field; 129 /* is this field is the MSB field in a set? */ 130 int msb_field_p; 131 } fx_cgen; 132#endif 133 134#ifdef TC_FIX_TYPE 135 /* Location where a backend can attach additional data 136 needed to perform fixups. */ 137 TC_FIX_TYPE tc_fix_data; 138#endif 139}; 140 141typedef struct fix fixS; 142 143struct reloc_list 144{ 145 struct reloc_list *next; 146 union 147 { 148 struct 149 { 150 symbolS *offset_sym; 151 reloc_howto_type *howto; 152 symbolS *sym; 153 bfd_vma addend; 154 } a; 155 struct 156 { 157 asection *sec; 158 asymbol *s; 159 arelent r; 160 } b; 161 } u; 162 const char *file; 163 unsigned int line; 164}; 165 166extern int finalize_syms; 167extern symbolS *abs_section_sym; 168extern addressT dot_value; 169extern fragS *dot_frag; 170extern struct reloc_list* reloc_list; 171 172extern void append (char **, char *, unsigned long); 173extern void record_alignment (segT, unsigned); 174extern int get_recorded_alignment (segT); 175extern void write_object_file (void); 176extern long relax_frag (segT, fragS *, long); 177extern int relax_segment (struct frag *, segT, int); 178extern void number_to_chars_littleendian (char *, valueT, int); 179extern void number_to_chars_bigendian (char *, valueT, int); 180extern fixS *fix_new (fragS *, unsigned long, unsigned long, symbolS *, 181 offsetT, int, bfd_reloc_code_real_type); 182extern fixS *fix_at_start (fragS *, unsigned long, symbolS *, 183 offsetT, int, bfd_reloc_code_real_type); 184extern fixS *fix_new_exp (fragS *, unsigned long, unsigned long, 185 expressionS *, int, bfd_reloc_code_real_type); 186extern void write_print_statistics (FILE *); 187 188#endif /* __write_h__ */ 189