2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
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)
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.
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
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"
33 * FixSs may be built up in any order.
38 /* These small fields are grouped together for compactness of
39 this structure, and efficiency of access on some architectures. */
41 /* Is this a pc-relative relocation? */
42 unsigned fx_pcrel : 1;
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;
48 /* Some bits for the CPU specific code. */
49 unsigned fx_tcbit : 1;
50 unsigned fx_tcbit2 : 1;
52 /* Has this relocation already been applied? */
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.
59 @@ Can this be determined from BFD? */
60 unsigned fx_no_overflow : 1;
62 /* The value is signed when checking for overflow. */
63 unsigned fx_signed : 1;
65 /* pc-relative offset adjust (only used by some CPU specific code) */
66 signed char fx_pcrel_adjust;
68 /* How many bytes are involved? */
69 unsigned char fx_size;
71 /* Which frag does this fix apply to? */
74 /* Where is the first byte to fix up? */
77 /* NULL or Symbol whose value we add in. */
80 /* NULL or Symbol whose value we subtract. */
83 /* Absolute number we add in. */
86 /* The value of dot when the fixup expression was parsed. */
87 addressT fx_dot_value;
89 /* The frag fx_dot_value is based on. */
92 /* Next fixS in linked list, or NULL. */
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
100 bit_fixS *fx_bit_fixP;
102 bfd_reloc_code_real_type fx_r_type;
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 */
113 /* The location of the instruction which created the reloc, used
114 in error messages. */
120 /* CGEN_INSN entry for this instruction. */
121 const struct cgen_insn *insn;
122 /* Target specific data, usually reloc number. */
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? */
132 /* Location where a backend can attach additional data
133 needed to perform fixups. */
134 TC_FIX_TYPE tc_fix_data;
138 typedef struct fix fixS;
142 struct reloc_list *next;
148 reloc_howto_type *howto;
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;
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);
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 *);
188 #endif /* __write_h__ */