| 1 | /* write.h |
| 2 | Copyright (C) 1987-2015 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__ */ |