| 1 | /* write.h |
| 2 | Copyright (C) 1987, 92, 93, 94, 95, 96, 1997 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 2, 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, 59 Temple Place - Suite 330, Boston, MA |
| 19 | 02111-1307, USA. */ |
| 20 | |
| 21 | #ifndef TC_I960 |
| 22 | #ifdef hpux |
| 23 | #define EXEC_MACHINE_TYPE HP9000S200_ID |
| 24 | #endif |
| 25 | #endif /* TC_I960 */ |
| 26 | |
| 27 | #ifndef BFD_ASSEMBLER |
| 28 | |
| 29 | #ifndef LOCAL_LABEL |
| 30 | #define LOCAL_LABEL(name) (name [0] == 'L' ) |
| 31 | #endif |
| 32 | |
| 33 | #define S_LOCAL_NAME(s) (LOCAL_LABEL (S_GET_NAME (s))) |
| 34 | |
| 35 | #endif /* ! BFD_ASSEMBLER */ |
| 36 | |
| 37 | /* This is the name of a fake symbol which will never appear in the |
| 38 | assembler output. S_IS_LOCAL detects it because of the \001. */ |
| 39 | #define FAKE_LABEL_NAME "L0\001" |
| 40 | |
| 41 | #include "bit_fix.h" |
| 42 | |
| 43 | /* |
| 44 | * FixSs may be built up in any order. |
| 45 | */ |
| 46 | |
| 47 | struct fix |
| 48 | { |
| 49 | /* These small fields are grouped together for compactness of |
| 50 | this structure, and efficiency of access on some architectures. */ |
| 51 | |
| 52 | /* pc-relative offset adjust */ |
| 53 | char fx_pcrel_adjust; |
| 54 | |
| 55 | /* How many bytes are involved? */ |
| 56 | unsigned char fx_size; |
| 57 | |
| 58 | /* Is this a pc-relative relocation? */ |
| 59 | unsigned fx_pcrel : 1; |
| 60 | |
| 61 | /* Is this a relocation to a procedure linkage table entry? If so, |
| 62 | some of the reductions we try to apply are invalid. A better way |
| 63 | might be to represent PLT entries with different kinds of |
| 64 | symbols, and use normal relocations (with undefined symbols); |
| 65 | look into it for version 2.6. */ |
| 66 | unsigned fx_plt : 1; |
| 67 | |
| 68 | /* Is this value an immediate displacement? */ |
| 69 | /* Only used on i960 and ns32k; merge it into TC_FIX_TYPE sometime. */ |
| 70 | unsigned fx_im_disp : 2; |
| 71 | |
| 72 | /* A bit for the CPU specific code. |
| 73 | This probably can be folded into tc_fix_data, below. */ |
| 74 | unsigned fx_tcbit : 1; |
| 75 | |
| 76 | /* Has this relocation already been applied? */ |
| 77 | unsigned fx_done : 1; |
| 78 | |
| 79 | /* Suppress overflow complaints on large addends. This is used |
| 80 | in the PowerPC ELF config to allow large addends on the |
| 81 | BFD_RELOC_{LO16,HI16,HI16_S} relocations. |
| 82 | |
| 83 | @@ Can this be determined from BFD? */ |
| 84 | unsigned fx_no_overflow : 1; |
| 85 | |
| 86 | /* The value is signed when checking for overflow. */ |
| 87 | unsigned fx_signed : 1; |
| 88 | |
| 89 | /* Which frag does this fix apply to? */ |
| 90 | fragS *fx_frag; |
| 91 | |
| 92 | /* Where is the first byte to fix up? */ |
| 93 | long fx_where; |
| 94 | |
| 95 | /* NULL or Symbol whose value we add in. */ |
| 96 | symbolS *fx_addsy; |
| 97 | |
| 98 | /* NULL or Symbol whose value we subtract. */ |
| 99 | symbolS *fx_subsy; |
| 100 | |
| 101 | /* Absolute number we add in. */ |
| 102 | valueT fx_offset; |
| 103 | |
| 104 | /* Next fixS in linked list, or NULL. */ |
| 105 | struct fix *fx_next; |
| 106 | |
| 107 | /* If NULL, no bitfix's to do. */ |
| 108 | /* Only i960-coff and ns32k use this, and i960-coff stores an |
| 109 | integer. This can probably be folded into tc_fix_data, below. |
| 110 | @@ Alpha also uses it, but only to disable certain relocation |
| 111 | processing. */ |
| 112 | bit_fixS *fx_bit_fixP; |
| 113 | |
| 114 | #ifdef BFD_ASSEMBLER |
| 115 | bfd_reloc_code_real_type fx_r_type; |
| 116 | #else |
| 117 | #ifdef NEED_FX_R_TYPE |
| 118 | /* Hack for machines where the type of reloc can't be |
| 119 | worked out by looking at how big it is. */ |
| 120 | int fx_r_type; |
| 121 | #endif |
| 122 | #endif |
| 123 | |
| 124 | /* This field is sort of misnamed. It appears to be a sort of random |
| 125 | scratch field, for use by the back ends. The main gas code doesn't |
| 126 | do anything but initialize it to zero. The use of it does need to |
| 127 | be coordinated between the cpu and format files, though. E.g., some |
| 128 | coff targets pass the `addend' field from the cpu file via this |
| 129 | field. I don't know why the `fx_offset' field above can't be used |
| 130 | for that; investigate later and document. KR */ |
| 131 | valueT fx_addnumber; |
| 132 | |
| 133 | /* The location of the instruction which created the reloc, used |
| 134 | in error messages. */ |
| 135 | char *fx_file; |
| 136 | unsigned fx_line; |
| 137 | |
| 138 | #ifdef TC_FIX_TYPE |
| 139 | /* Location where a backend can attach additional data |
| 140 | needed to perform fixups. */ |
| 141 | TC_FIX_TYPE tc_fix_data; |
| 142 | #endif |
| 143 | }; |
| 144 | |
| 145 | typedef struct fix fixS; |
| 146 | |
| 147 | #ifndef BFD_ASSEMBLER |
| 148 | extern char *next_object_file_charP; |
| 149 | |
| 150 | #ifndef MANY_SEGMENTS |
| 151 | COMMON fixS *text_fix_root, *text_fix_tail; /* Chains fixSs. */ |
| 152 | COMMON fixS *data_fix_root, *data_fix_tail; /* Chains fixSs. */ |
| 153 | COMMON fixS *bss_fix_root, *bss_fix_tail; /* Chains fixSs. */ |
| 154 | extern struct frag *text_last_frag; /* Last frag in segment. */ |
| 155 | extern struct frag *data_last_frag; /* Last frag in segment. */ |
| 156 | #endif |
| 157 | COMMON fixS **seg_fix_rootP, **seg_fix_tailP; /* -> one of above. */ |
| 158 | #endif |
| 159 | |
| 160 | extern long string_byte_count; |
| 161 | extern int section_alignment[]; |
| 162 | |
| 163 | extern bit_fixS *bit_fix_new |
| 164 | PARAMS ((int size, int offset, long base_type, long base_adj, long min, |
| 165 | long max, long add)); |
| 166 | extern void append PARAMS ((char **charPP, char *fromP, unsigned long length)); |
| 167 | extern void record_alignment PARAMS ((segT seg, int align)); |
| 168 | extern void subsegs_finish PARAMS ((void)); |
| 169 | extern void write_object_file PARAMS ((void)); |
| 170 | extern long relax_frag PARAMS ((fragS *, long)); |
| 171 | extern void relax_segment |
| 172 | PARAMS ((struct frag * seg_frag_root, segT seg_type)); |
| 173 | |
| 174 | extern void number_to_chars_littleendian PARAMS ((char *, valueT, int)); |
| 175 | extern void number_to_chars_bigendian PARAMS ((char *, valueT, int)); |
| 176 | |
| 177 | #ifdef BFD_ASSEMBLER |
| 178 | extern fixS *fix_new |
| 179 | PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol, |
| 180 | offsetT offset, int pcrel, bfd_reloc_code_real_type r_type)); |
| 181 | extern fixS *fix_new_exp |
| 182 | PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel, |
| 183 | bfd_reloc_code_real_type r_type)); |
| 184 | #else |
| 185 | extern fixS *fix_new |
| 186 | PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol, |
| 187 | offsetT offset, int pcrel, int r_type)); |
| 188 | extern fixS *fix_new_exp |
| 189 | PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel, |
| 190 | int r_type)); |
| 191 | #endif |
| 192 | |
| 193 | extern void write_print_statistics PARAMS ((FILE *)); |
| 194 | |
| 195 | /* end of write.h */ |