* dwarf2dbg.c (dwarf2_gen_line_info): Mirror the section symbol
[deliverable/binutils-gdb.git] / gas / config / obj-bout.h
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252b5132
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1/* b.out object file format
2 Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 1996
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
9 published by the Free Software Foundation; either version 2,
10 or (at your option) any later version.
11
12 GAS is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 the GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public
18 License along with GAS; see the file COPYING. If not, write
19 to the Free Software Foundation, 59 Temple Place - Suite 330, Cambridge, MA
20 02139, USA. */
21
22/*
23 * This file is a modified version of 'a.out.h'. It is to be used in all GNU
24 * tools modified to support the i80960 b.out format (or tools that operate on
25 * object files created by such tools).
26 *
27 * All i80960 development is done in a CROSS-DEVELOPMENT environment. I.e.,
28 * object code is generated on, and executed under the direction of a symbolic
29 * debugger running on, a host system. We do not want to be subject to the
30 * vagaries of which host it is or whether it supports COFF or a.out format, or
31 * anything else. We DO want to:
32 *
33 * o always generate the same format object files, regardless of host.
34 *
35 * o have an 'a.out' header that we can modify for our own purposes
36 * (the 80960 is typically an embedded processor and may require
37 * enhanced linker support that the normal a.out.h header can't
38 * accommodate).
39 *
40 * As for byte-ordering, the following rules apply:
41 *
42 * o Text and data that is actually downloaded to the target is always
43 * in i80960 (little-endian) order.
44 *
45 * o All other numbers (in the header, symbols, relocation directives)
46 * are in host byte-order: object files CANNOT be lifted from a
47 * little-end host and used on a big-endian (or vice versa) without
48 * modification.
49 * ==> THIS IS NO LONGER TRUE USING BFD. WE CAN GENERATE ANY BYTE ORDER
50 * FOR THE HEADER, AND READ ANY BYTE ORDER. PREFERENCE WOULD BE TO
51 * USE LITTLE-ENDIAN BYTE ORDER THROUGHOUT, REGARDLESS OF HOST. <==
52 *
53 * o The downloader ('comm960') takes care to generate a pseudo-header
54 * with correct (i80960) byte-ordering before shipping text and data
55 * off to the NINDY monitor in the target systems. Symbols and
56 * relocation info are never sent to the target.
57 */
58
59
60#define OBJ_BOUT 1
61
62#define OUTPUT_FLAVOR bfd_target_aout_flavour
63
64#include "targ-cpu.h"
65
66#define OBJ_DEFAULT_OUTPUT_FILE_NAME "b.out"
67
68extern const short seg_N_TYPE[];
69extern const segT N_TYPE_seg[];
70
71#define BMAGIC 0415
72/* We don't accept the following (see N_BADMAG macro).
73 * They're just here so GNU code will compile.
74 */
75#define OMAGIC 0407 /* old impure format */
76#define NMAGIC 0410 /* read-only text */
77#define ZMAGIC 0413 /* demand load format */
78
79#ifndef DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE
80#define DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE (BMAGIC)
81#endif /* DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE */
82
83/* FILE HEADER
84 * All 'lengths' are given as a number of bytes.
85 * All 'alignments' are for relinkable files only; an alignment of
86 * 'n' indicates the corresponding segment must begin at an
87 * address that is a multiple of (2**n).
88 */
89struct exec
90 {
91 /* Standard stuff */
92 unsigned long a_magic; /* Identifies this as a b.out file */
93 unsigned long a_text; /* Length of text */
94 unsigned long a_data; /* Length of data */
95 unsigned long a_bss; /* Length of runtime uninitialized data area */
96 unsigned long a_syms; /* Length of symbol table */
97 unsigned long a_entry; /* Runtime start address */
98 unsigned long a_trsize; /* Length of text relocation info */
99 unsigned long a_drsize; /* Length of data relocation info */
100
101 /* Added for i960 */
102 unsigned long a_tload; /* Text runtime load address */
103 unsigned long a_dload; /* Data runtime load address */
104 unsigned char a_talign; /* Alignment of text segment */
105 unsigned char a_dalign; /* Alignment of data segment */
106 unsigned char a_balign; /* Alignment of bss segment */
107 unsigned char a_relaxable; /* Contains enough info to relax */
108 };
109
110#define N_BADMAG(x) (((x).a_magic)!=BMAGIC)
111#define N_TXTOFF(x) ( sizeof(struct exec) )
112#define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
113#define N_TROFF(x) ( N_DATOFF(x) + (x).a_data )
114#define N_DROFF(x) ( N_TROFF(x) + (x).a_trsize )
115#define N_SYMOFF(x) ( N_DROFF(x) + (x).a_drsize )
116#define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
117
118/* A single entry in the symbol table
119 */
120struct nlist
121 {
122 union
123 {
124 char *n_name;
125 struct nlist *n_next;
126 long n_strx; /* Index into string table */
127 }
128 n_un;
129 unsigned char n_type; /* See below */
130 char n_other; /* Used in i80960 support -- see below */
131 short n_desc;
132 unsigned long n_value;
133 };
134
135typedef struct nlist obj_symbol_type;
136
137/* Legal values of n_type
138 */
139#define N_UNDF 0 /* Undefined symbol */
140#define N_ABS 2 /* Absolute symbol */
141#define N_TEXT 4 /* Text symbol */
142#define N_DATA 6 /* Data symbol */
143#define N_BSS 8 /* BSS symbol */
144#define N_FN 31 /* Filename symbol */
145
146#define N_EXT 1 /* External symbol (OR'd in with one of above) */
147#define N_TYPE 036 /* Mask for all the type bits */
148#define N_STAB 0340 /* Mask for all bits used for SDB entries */
149
150#ifndef CUSTOM_RELOC_FORMAT
151struct relocation_info
152 {
153 int r_address; /* File address of item to be relocated */
154 unsigned
155 r_index:24, /* Index of symbol on which relocation is based*/
156 r_pcrel:1, /* 1 => relocate PC-relative; else absolute
157 * On i960, pc-relative implies 24-bit
158 * address, absolute implies 32-bit.
159 */
160 r_length:2, /* Number of bytes to relocate:
161 * 0 => 1 byte
162 * 1 => 2 bytes
163 * 2 => 4 bytes -- only value used for i960
164 */
165 r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */
166 r_disp:1, /* Something for the GNU NS32K assembler */
167 r_callj:1, /* 1 if relocation target is an i960 'callj' */
168 nuthin:1; /* Unused */
169 };
170
171#endif /* CUSTOM_RELOC_FORMAT */
172
173/*
174 * Macros to extract information from a symbol table entry.
175 * This syntaxic indirection allows independence regarding a.out or coff.
176 * The argument (s) of all these macros is a pointer to a symbol table entry.
177 */
178
179/* Predicates */
180/* True if the symbol is external */
181#define S_IS_EXTERNAL(s) ((s)->sy_symbol.n_type & N_EXT)
182
183/* True if symbol has been defined, ie is in N_{TEXT,DATA,BSS,ABS} or N_EXT */
184#define S_IS_DEFINED(s) ((S_GET_TYPE(s) != N_UNDF) || (S_GET_DESC(s) != 0))
185
186#define S_IS_COMMON(s) \
187 (S_GET_TYPE (s) == N_UNDF && S_GET_VALUE (s) != 0)
188
189#define S_IS_REGISTER(s) ((s)->sy_symbol.n_type == N_REGISTER)
190
191/* True if a debug special symbol entry */
192#define S_IS_DEBUG(s) ((s)->sy_symbol.n_type & N_STAB)
193/* True if a symbol is local symbol name */
194#define S_IS_LOCAL(s) \
195 ((S_GET_NAME (s) \
196 && !S_IS_DEBUG (s) \
197 && (strchr (S_GET_NAME (s), '\001') != NULL \
198 || strchr (S_GET_NAME (s), '\002') != NULL \
199 || (S_LOCAL_NAME(s) && !flag_keep_locals))) \
200 || (flag_strip_local_absolute \
201 && !S_IS_EXTERNAL(s) \
202 && S_GET_SEGMENT(s) == absolute_section))
203/* True if a symbol is not defined in this file */
204#define S_IS_EXTERN(s) ((s)->sy_symbol.n_type & N_EXT)
205/* True if the symbol has been generated because of a .stabd directive */
206#define S_IS_STABD(s) (S_GET_NAME(s) == NULL)
207
208/* Accessors */
209/* The name of the symbol */
210#define S_GET_NAME(s) ((s)->sy_symbol.n_un.n_name)
211/* The pointer to the string table */
212#define S_GET_OFFSET(s) ((s)->sy_symbol.n_un.n_strx)
213/* The type of the symbol */
214#define S_GET_TYPE(s) ((s)->sy_symbol.n_type & N_TYPE)
215/* The numeric value of the segment */
216#define S_GET_SEGMENT(s) (N_TYPE_seg[S_GET_TYPE(s)])
217/* The n_other expression value */
218#define S_GET_OTHER(s) ((s)->sy_symbol.n_other)
219/* The n_desc expression value */
220#define S_GET_DESC(s) ((s)->sy_symbol.n_desc)
221
222/* Modifiers */
223/* Assume that a symbol cannot be simultaneously in more than on segment */
224/* set segment */
225#define S_SET_SEGMENT(s,seg) ((s)->sy_symbol.n_type &= ~N_TYPE,(s)->sy_symbol.n_type|=SEGMENT_TO_SYMBOL_TYPE(seg))
226/* The symbol is external */
227#define S_SET_EXTERNAL(s) ((s)->sy_symbol.n_type |= N_EXT)
228/* The symbol is not external */
229#define S_CLEAR_EXTERNAL(s) ((s)->sy_symbol.n_type &= ~N_EXT)
230/* Set the name of the symbol */
231#define S_SET_NAME(s,v) ((s)->sy_symbol.n_un.n_name = (v))
232/* Set the offset in the string table */
233#define S_SET_OFFSET(s,v) ((s)->sy_symbol.n_un.n_strx = (v))
234/* Set the n_other expression value */
235#define S_SET_OTHER(s,v) ((s)->sy_symbol.n_other = (v))
236/* Set the n_desc expression value */
237#define S_SET_DESC(s,v) ((s)->sy_symbol.n_desc = (v))
238/* Set the n_type value */
239#define S_SET_TYPE(s,v) ((s)->sy_symbol.n_type = (v))
240
241/* File header macro and type definition */
242
243#define H_GET_FILE_SIZE(h) (sizeof(struct exec) + \
244 H_GET_TEXT_SIZE(h) + H_GET_DATA_SIZE(h) + \
245 H_GET_SYMBOL_TABLE_SIZE(h) + \
246 H_GET_TEXT_RELOCATION_SIZE(h) + \
247 H_GET_DATA_RELOCATION_SIZE(h) + \
248 (h)->string_table_size)
249
250#define H_GET_HEADER_SIZE(h) (sizeof(struct exec))
251#define H_GET_TEXT_SIZE(h) ((h)->header.a_text)
252#define H_GET_DATA_SIZE(h) ((h)->header.a_data)
253#define H_GET_BSS_SIZE(h) ((h)->header.a_bss)
254#define H_GET_TEXT_RELOCATION_SIZE(h) ((h)->header.a_trsize)
255#define H_GET_DATA_RELOCATION_SIZE(h) ((h)->header.a_drsize)
256#define H_GET_SYMBOL_TABLE_SIZE(h) ((h)->header.a_syms)
257#define H_GET_MAGIC_NUMBER(h) ((h)->header.a_info)
258#define H_GET_ENTRY_POINT(h) ((h)->header.a_entry)
259#define H_GET_STRING_SIZE(h) ((h)->string_table_size)
260#define H_GET_LINENO_SIZE(h) (0)
261
262#ifdef EXEC_MACHINE_TYPE
263#define H_GET_MACHINE_TYPE(h) ((h)->header.a_machtype)
264#endif /* EXEC_MACHINE_TYPE */
265#ifdef EXEC_VERSION
266#define H_GET_VERSION(h) ((h)->header.a_version)
267#endif /* EXEC_VERSION */
268
269#define H_SET_TEXT_SIZE(h,v) ((h)->header.a_text = (v))
270#define H_SET_DATA_SIZE(h,v) ((h)->header.a_data = (v))
271#define H_SET_BSS_SIZE(h,v) ((h)->header.a_bss = (v))
272
273#define H_SET_RELOCATION_SIZE(h,t,d) (H_SET_TEXT_RELOCATION_SIZE((h),(t)),\
274 H_SET_DATA_RELOCATION_SIZE((h),(d)))
275
276#define H_SET_TEXT_RELOCATION_SIZE(h,v) ((h)->header.a_trsize = (v))
277#define H_SET_DATA_RELOCATION_SIZE(h,v) ((h)->header.a_drsize = (v))
278#define H_SET_SYMBOL_TABLE_SIZE(h,v) ((h)->header.a_syms = (v) * \
279 sizeof(struct nlist))
280
281#define H_SET_MAGIC_NUMBER(h,v) ((h)->header.a_magic = (v))
282
283#define H_SET_ENTRY_POINT(h,v) ((h)->header.a_entry = (v))
284#define H_SET_STRING_SIZE(h,v) ((h)->string_table_size = (v))
285#ifdef EXEC_MACHINE_TYPE
286#define H_SET_MACHINE_TYPE(h,v) ((h)->header.a_machtype = (v))
287#endif /* EXEC_MACHINE_TYPE */
288#ifdef EXEC_VERSION
289#define H_SET_VERSION(h,v) ((h)->header.a_version = (v))
290#endif /* EXEC_VERSION */
291
292typedef struct
293 {
294 struct exec header; /* a.out header */
295 long string_table_size; /* names + '\0' + sizeof(int) */
296 }
297
298object_headers;
299
300/* unused hooks. */
301#define OBJ_EMIT_LINENO(a, b, c) {;}
302#define obj_pre_write_hook(a) {;}
303
304#if __STDC__
305struct fix;
306#endif
307extern void tc_aout_fix_to_chars PARAMS ((char *where,
308 struct fix *fixP,
309 relax_addressT segment_address));
310extern void tc_bout_fix_to_chars PARAMS ((char *where,
311 struct fix *fixP,
312 relax_addressT segment_address));
313
314#define AOUT_STABS
315
316/* end of obj-bout.h */
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