write.h revision 1.7 
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 __write_h__
22#define __write_h__
23
24#ifndef TC_I960
25#ifdef hpux
26#define EXEC_MACHINE_TYPE HP9000S200_ID
27#endif
28#endif /* TC_I960 */
29
30#ifndef BFD_ASSEMBLER
31
32#ifndef LOCAL_LABEL
33#define LOCAL_LABEL(name) (name [0] == 'L' )
34#endif
35
36#define S_LOCAL_NAME(s) (LOCAL_LABEL (S_GET_NAME (s)))
37
38#endif /* ! BFD_ASSEMBLER */
39
40/* This is the name of a fake symbol which will never appear in the
41   assembler output.  S_IS_LOCAL detects it because of the \001.  */
42#define FAKE_LABEL_NAME "L0\001"
43
44#include "bit_fix.h"
45
46/*
47 * FixSs may be built up in any order.
48 */
49
50struct fix
51{
52  /* These small fields are grouped together for compactness of
53     this structure, and efficiency of access on some architectures.  */
54
55  /* pc-relative offset adjust (only used by m68k) */
56  char fx_pcrel_adjust;
57
58  /* How many bytes are involved? */
59  unsigned char fx_size;
60
61  /* Is this a pc-relative relocation?  */
62  unsigned fx_pcrel : 1;
63
64  /* Is this a relocation to a procedure linkage table entry?  If so,
65     some of the reductions we try to apply are invalid.  A better way
66     might be to represent PLT entries with different kinds of
67     symbols, and use normal relocations (with undefined symbols);
68     look into it for version 2.6.  */
69  unsigned fx_plt : 1;
70
71  /* Is this value an immediate displacement?  */
72  /* Only used on i960 and ns32k; merge it into TC_FIX_TYPE sometime.  */
73  unsigned fx_im_disp : 2;
74
75  /* A bit for the CPU specific code.
76     This probably can be folded into tc_fix_data, below.  */
77  unsigned fx_tcbit : 1;
78
79  /* Has this relocation already been applied?  */
80  unsigned fx_done : 1;
81
82  /* Suppress overflow complaints on large addends.  This is used
83     in the PowerPC ELF config to allow large addends on the
84     BFD_RELOC_{LO16,HI16,HI16_S} relocations.
85
86     @@ Can this be determined from BFD?  */
87  unsigned fx_no_overflow : 1;
88
89  /* The value is signed when checking for overflow.  */
90  unsigned fx_signed : 1;
91
92  /* Which frag does this fix apply to?  */
93  fragS *fx_frag;
94
95  /* Where is the first byte to fix up?  */
96  long fx_where;
97
98  /* NULL or Symbol whose value we add in. */
99  symbolS *fx_addsy;
100
101  /* NULL or Symbol whose value we subtract. */
102  symbolS *fx_subsy;
103
104  /* Absolute number we add in. */
105  valueT fx_offset;
106
107  /* Next fixS in linked list, or NULL.  */
108  struct fix *fx_next;
109
110  /* If NULL, no bitfix's to do.  */
111  /* Only i960-coff and ns32k use this, and i960-coff stores an
112     integer.  This can probably be folded into tc_fix_data, below.
113     @@ Alpha also uses it, but only to disable certain relocation
114     processing.  */
115  bit_fixS *fx_bit_fixP;
116
117#ifdef BFD_ASSEMBLER
118  bfd_reloc_code_real_type fx_r_type;
119#else
120#ifdef NEED_FX_R_TYPE
121  /* Hack for machines where the type of reloc can't be
122     worked out by looking at how big it is.  */
123  int fx_r_type;
124#endif
125#endif
126
127  /* This field is sort of misnamed.  It appears to be a sort of random
128     scratch field, for use by the back ends.  The main gas code doesn't
129     do anything but initialize it to zero.  The use of it does need to
130     be coordinated between the cpu and format files, though.  E.g., some
131     coff targets pass the `addend' field from the cpu file via this
132     field.  I don't know why the `fx_offset' field above can't be used
133     for that; investigate later and document. KR  */
134  valueT fx_addnumber;
135
136  /* The location of the instruction which created the reloc, used
137     in error messages.  */
138  char *fx_file;
139  unsigned fx_line;
140
141#ifdef USING_CGEN
142  struct {
143    /* CGEN_INSN entry for this instruction.  */
144    const struct cgen_insn *insn;
145    /* Target specific data, usually reloc number.  */
146    int opinfo;
147  } fx_cgen;
148#endif
149
150#ifdef TC_FIX_TYPE
151  /* Location where a backend can attach additional data
152     needed to perform fixups.  */
153  TC_FIX_TYPE tc_fix_data;
154#endif
155};
156
157typedef struct fix fixS;
158
159#ifndef BFD_ASSEMBLER
160extern char *next_object_file_charP;
161
162#ifndef MANY_SEGMENTS
163COMMON fixS *text_fix_root, *text_fix_tail;	/* Chains fixSs. */
164COMMON fixS *data_fix_root, *data_fix_tail;	/* Chains fixSs. */
165COMMON fixS *bss_fix_root, *bss_fix_tail;	/* Chains fixSs. */
166extern struct frag *text_last_frag;		/* Last frag in segment. */
167extern struct frag *data_last_frag;		/* Last frag in segment. */
168#endif
169COMMON fixS **seg_fix_rootP, **seg_fix_tailP;	/* -> one of above. */
170#endif
171
172extern long string_byte_count;
173extern int section_alignment[];
174
175extern bit_fixS *bit_fix_new
176  PARAMS ((int size, int offset, long base_type, long base_adj, long min,
177	   long max, long add));
178extern void append PARAMS ((char **charPP, char *fromP, unsigned long length));
179extern void record_alignment PARAMS ((segT seg, int align));
180extern void subsegs_finish PARAMS ((void));
181extern void write_object_file PARAMS ((void));
182extern long relax_frag PARAMS ((fragS *, long));
183extern void relax_segment
184  PARAMS ((struct frag * seg_frag_root, segT seg_type));
185
186extern void number_to_chars_littleendian PARAMS ((char *, valueT, int));
187extern void number_to_chars_bigendian    PARAMS ((char *, valueT, int));
188
189#ifdef BFD_ASSEMBLER
190extern fixS *fix_new
191  PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol,
192	   offsetT offset, int pcrel, bfd_reloc_code_real_type r_type));
193extern fixS *fix_new_exp
194  PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel,
195	   bfd_reloc_code_real_type r_type));
196#else
197extern fixS *fix_new
198  PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol,
199	   offsetT offset, int pcrel, int r_type));
200extern fixS *fix_new_exp
201  PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel,
202	   int r_type));
203#endif
204
205extern void write_print_statistics PARAMS ((FILE *));
206
207#endif /* __write_h__ */
208/* end of write.h */
209