write.h revision 77298 
1/* write.h
2   Copyright (C) 1987, 92, 93, 94, 95, 96, 97, 2000
3   Free Software Foundation, Inc.
4
5   This file is part of GAS, the GNU Assembler.
6
7   GAS is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 2, or (at your option)
10   any later version.
11
12   GAS is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with GAS; see the file COPYING.  If not, write to the Free
19   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
20   02111-1307, USA.  */
21
22#ifndef __write_h__
23#define __write_h__
24
25#ifndef TC_I960
26#ifdef hpux
27#define EXEC_MACHINE_TYPE HP9000S200_ID
28#endif
29#endif /* TC_I960 */
30
31#ifndef BFD_ASSEMBLER
32
33#ifndef LOCAL_LABEL
34#define LOCAL_LABEL(name) (name [0] == 'L' )
35#endif
36
37#define S_LOCAL_NAME(s) (LOCAL_LABEL (S_GET_NAME (s)))
38
39#endif /* ! BFD_ASSEMBLER */
40
41/* This is the name of a fake symbol which will never appear in the
42   assembler output.  S_IS_LOCAL detects it because of the \001.  */
43#define FAKE_LABEL_NAME "L0\001"
44
45#include "bit_fix.h"
46
47/*
48 * FixSs may be built up in any order.
49 */
50
51struct fix
52{
53  /* These small fields are grouped together for compactness of
54     this structure, and efficiency of access on some architectures.  */
55
56  /* pc-relative offset adjust (only used by m68k) */
57  char fx_pcrel_adjust;
58
59  /* How many bytes are involved? */
60  unsigned char fx_size;
61
62  /* Is this a pc-relative relocation?  */
63  unsigned fx_pcrel : 1;
64
65  /* Is this a relocation to a procedure linkage table entry?  If so,
66     some of the reductions we try to apply are invalid.  A better way
67     might be to represent PLT entries with different kinds of
68     symbols, and use normal relocations (with undefined symbols);
69     look into it for version 2.6.  */
70  unsigned fx_plt : 1;
71
72  /* Is this value an immediate displacement?  */
73  /* Only used on i960 and ns32k; merge it into TC_FIX_TYPE sometime.  */
74  unsigned fx_im_disp : 2;
75
76  /* A bit for the CPU specific code.
77     This probably can be folded into tc_fix_data, below.  */
78  unsigned fx_tcbit : 1;
79
80  /* Has this relocation already been applied?  */
81  unsigned fx_done : 1;
82
83  /* Suppress overflow complaints on large addends.  This is used
84     in the PowerPC ELF config to allow large addends on the
85     BFD_RELOC_{LO16,HI16,HI16_S} relocations.
86
87     @@ Can this be determined from BFD?  */
88  unsigned fx_no_overflow : 1;
89
90  /* The value is signed when checking for overflow.  */
91  unsigned fx_signed : 1;
92
93  /* Which frag does this fix apply to?  */
94  fragS *fx_frag;
95
96  /* Where is the first byte to fix up?  */
97  long fx_where;
98
99  /* NULL or Symbol whose value we add in.  */
100  symbolS *fx_addsy;
101
102  /* NULL or Symbol whose value we subtract.  */
103  symbolS *fx_subsy;
104
105  /* Absolute number we add in.  */
106  valueT fx_offset;
107
108  /* Next fixS in linked list, or NULL.  */
109  struct fix *fx_next;
110
111  /* If NULL, no bitfix's to do.  */
112  /* Only i960-coff and ns32k use this, and i960-coff stores an
113     integer.  This can probably be folded into tc_fix_data, below.
114     @@ Alpha also uses it, but only to disable certain relocation
115     processing.  */
116  bit_fixS *fx_bit_fixP;
117
118#ifdef BFD_ASSEMBLER
119  bfd_reloc_code_real_type fx_r_type;
120#else
121#ifdef NEED_FX_R_TYPE
122  /* Hack for machines where the type of reloc can't be
123     worked out by looking at how big it is.  */
124  int fx_r_type;
125#endif
126#endif
127
128  /* This field is sort of misnamed.  It appears to be a sort of random
129     scratch field, for use by the back ends.  The main gas code doesn't
130     do anything but initialize it to zero.  The use of it does need to
131     be coordinated between the cpu and format files, though.  E.g., some
132     coff targets pass the `addend' field from the cpu file via this
133     field.  I don't know why the `fx_offset' field above can't be used
134     for that; investigate later and document. KR  */
135  valueT fx_addnumber;
136
137  /* The location of the instruction which created the reloc, used
138     in error messages.  */
139  char *fx_file;
140  unsigned fx_line;
141
142#ifdef USING_CGEN
143  struct {
144    /* CGEN_INSN entry for this instruction.  */
145    const struct cgen_insn *insn;
146    /* Target specific data, usually reloc number.  */
147    int opinfo;
148  } fx_cgen;
149#endif
150
151#ifdef TC_FIX_TYPE
152  /* Location where a backend can attach additional data
153     needed to perform fixups.  */
154  TC_FIX_TYPE tc_fix_data;
155#endif
156};
157
158typedef struct fix fixS;
159
160#ifndef BFD_ASSEMBLER
161extern char *next_object_file_charP;
162
163#ifndef MANY_SEGMENTS
164COMMON fixS *text_fix_root, *text_fix_tail;	/* Chains fixSs.  */
165COMMON fixS *data_fix_root, *data_fix_tail;	/* Chains fixSs.  */
166COMMON fixS *bss_fix_root, *bss_fix_tail;	/* Chains fixSs.  */
167extern struct frag *text_last_frag;		/* Last frag in segment.  */
168extern struct frag *data_last_frag;		/* Last frag in segment.  */
169#endif
170COMMON fixS **seg_fix_rootP, **seg_fix_tailP;	/* -> one of above.  */
171#endif
172
173extern long string_byte_count;
174extern int section_alignment[];
175
176extern bit_fixS *bit_fix_new
177  PARAMS ((int size, int offset, long base_type, long base_adj, long min,
178	   long max, long add));
179extern void append PARAMS ((char **charPP, char *fromP, unsigned long length));
180extern void record_alignment PARAMS ((segT seg, int align));
181extern int get_recorded_alignment PARAMS ((segT seg));
182extern void subsegs_finish PARAMS ((void));
183extern void write_object_file PARAMS ((void));
184extern long relax_frag PARAMS ((fragS *, long));
185extern void relax_segment
186  PARAMS ((struct frag * seg_frag_root, segT seg_type));
187
188extern void number_to_chars_littleendian PARAMS ((char *, valueT, int));
189extern void number_to_chars_bigendian    PARAMS ((char *, valueT, int));
190
191#ifdef BFD_ASSEMBLER
192extern fixS *fix_new
193  PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol,
194	   offsetT offset, int pcrel, bfd_reloc_code_real_type r_type));
195extern fixS *fix_new_exp
196  PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel,
197	   bfd_reloc_code_real_type r_type));
198#else
199extern fixS *fix_new
200  PARAMS ((fragS * frag, int where, int size, symbolS * add_symbol,
201	   offsetT offset, int pcrel, int r_type));
202extern fixS *fix_new_exp
203  PARAMS ((fragS * frag, int where, int size, expressionS *exp, int pcrel,
204	   int r_type));
205#endif
206
207extern void write_print_statistics PARAMS ((FILE *));
208
209#endif /* __write_h__ */
210