1/* write.h 2 Copyright 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001, 3 2002, 2003, 2005, 2006, 2007 4 Free Software Foundation, Inc. 5 6 This file is part of GAS, the GNU Assembler. 7 8 GAS is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2, or (at your option) 11 any later version. 12 13 GAS is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GAS; see the file COPYING. If not, write to the Free 20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 21 02110-1301, USA. */ 22 23#ifndef __write_h__ 24#define __write_h__ 25 26/* This is the name of a fake symbol which will never appear in the 27 assembler output. S_IS_LOCAL detects it because of the \001. */ 28#ifndef FAKE_LABEL_NAME 29#define FAKE_LABEL_NAME "L0\001" 30#endif 31 32#include "bit_fix.h" 33 34/* 35 * FixSs may be built up in any order. 36 */ 37 38struct fix 39{ 40 /* These small fields are grouped together for compactness of 41 this structure, and efficiency of access on some architectures. */ 42 43 /* Is this a pc-relative relocation? */ 44 unsigned fx_pcrel : 1; 45 46 /* Is this value an immediate displacement? */ 47 /* Only used on ns32k; merge it into TC_FIX_TYPE sometime. */ 48 unsigned fx_im_disp : 2; 49 50 /* Some bits for the CPU specific code. */ 51 unsigned fx_tcbit : 1; 52 unsigned fx_tcbit2 : 1; 53 54 /* Has this relocation already been applied? */ 55 unsigned fx_done : 1; 56 57 /* Suppress overflow complaints on large addends. This is used 58 in the PowerPC ELF config to allow large addends on the 59 BFD_RELOC_{LO16,HI16,HI16_S} relocations. 60 61 @@ Can this be determined from BFD? */ 62 unsigned fx_no_overflow : 1; 63 64 /* The value is signed when checking for overflow. */ 65 unsigned fx_signed : 1; 66 67 /* pc-relative offset adjust (only used by m68k and m68hc11) */ 68 char fx_pcrel_adjust; 69 70 /* How many bytes are involved? */ 71 unsigned char fx_size; 72 73 /* Which frag does this fix apply to? */ 74 fragS *fx_frag; 75 76 /* Where is the first byte to fix up? */ 77 long fx_where; 78 79 /* NULL or Symbol whose value we add in. */ 80 symbolS *fx_addsy; 81 82 /* NULL or Symbol whose value we subtract. */ 83 symbolS *fx_subsy; 84 85 /* Absolute number we add in. */ 86 valueT fx_offset; 87 88 /* The value of dot when the fixup expression was parsed. */ 89 addressT fx_dot_value; 90 91 /* Next fixS in linked list, or NULL. */ 92 struct fix *fx_next; 93 94 /* If NULL, no bitfix's to do. */ 95 /* Only i960-coff and ns32k use this, and i960-coff stores an 96 integer. This can probably be folded into tc_fix_data, below. 97 @@ Alpha also uses it, but only to disable certain relocation 98 processing. */ 99 bit_fixS *fx_bit_fixP; 100 101 bfd_reloc_code_real_type fx_r_type; 102 103 /* This field is sort of misnamed. It appears to be a sort of random 104 scratch field, for use by the back ends. The main gas code doesn't 105 do anything but initialize it to zero. The use of it does need to 106 be coordinated between the cpu and format files, though. E.g., some 107 coff targets pass the `addend' field from the cpu file via this 108 field. I don't know why the `fx_offset' field above can't be used 109 for that; investigate later and document. KR */ 110 valueT fx_addnumber; 111 112 /* The location of the instruction which created the reloc, used 113 in error messages. */ 114 char *fx_file; 115 unsigned fx_line; 116 117#ifdef USING_CGEN 118 struct { 119 /* CGEN_INSN entry for this instruction. */ 120 const struct cgen_insn *insn; 121 /* Target specific data, usually reloc number. */ 122 int opinfo; 123 /* Which ifield this fixup applies to. */ 124 struct cgen_maybe_multi_ifield * field; 125 /* is this field is the MSB field in a set? */ 126 int msb_field_p; 127 } fx_cgen; 128#endif 129 130#ifdef TC_FIX_TYPE 131 /* Location where a backend can attach additional data 132 needed to perform fixups. */ 133 TC_FIX_TYPE tc_fix_data; 134#endif 135}; 136 137typedef struct fix fixS; 138 139struct reloc_list 140{ 141 struct reloc_list *next; 142 union 143 { 144 struct 145 { 146 symbolS *offset_sym; 147 reloc_howto_type *howto; 148 symbolS *sym; 149 bfd_vma addend; 150 } a; 151 struct 152 { 153 asection *sec; 154 asymbol *s; 155 arelent r; 156 } b; 157 } u; 158 char *file; 159 unsigned int line; 160}; 161 162extern int finalize_syms; 163extern symbolS *abs_section_sym; 164extern addressT dot_value; 165extern struct reloc_list* reloc_list; 166 167extern void append (char **charPP, char *fromP, unsigned long length); 168extern void record_alignment (segT seg, int align); 169extern int get_recorded_alignment (segT seg); 170extern void subsegs_finish (void); 171extern void write_object_file (void); 172extern long relax_frag (segT, fragS *, long); 173extern int relax_segment (struct frag *, segT, int); 174extern void number_to_chars_littleendian (char *, valueT, int); 175extern void number_to_chars_bigendian (char *, valueT, int); 176extern fixS *fix_new 177 (fragS * frag, int where, int size, symbolS * add_symbol, 178 offsetT offset, int pcrel, bfd_reloc_code_real_type r_type); 179extern fixS *fix_new_exp 180 (fragS * frag, int where, int size, expressionS *exp, int pcrel, 181 bfd_reloc_code_real_type r_type); 182extern void write_print_statistics (FILE *); 183 184#endif /* __write_h__ */ 185