obj-aout.h revision 77298 
1/* obj-aout.h, a.out object file format for gas, the assembler.
2   Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 96, 98, 99, 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
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 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/* Tag to validate a.out object file format processing */
23#define OBJ_AOUT 1
24
25#include "targ-cpu.h"
26
27#ifdef BFD_ASSEMBLER
28
29#include "bfd/libaout.h"
30
31#define OUTPUT_FLAVOR bfd_target_aout_flavour
32
33#else /* ! BFD_ASSEMBLER */
34
35#ifndef VMS
36#include "aout_gnu.h"		/* Needed to define struct nlist. Sigh.  */
37#else
38#include "a_out.h"
39#endif
40
41#ifndef AOUT_MACHTYPE
42#define AOUT_MACHTYPE 0
43#endif /* AOUT_MACHTYPE */
44
45extern const short seg_N_TYPE[];
46extern const segT N_TYPE_seg[];
47
48#ifndef DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE
49#define DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE	(OMAGIC)
50#endif /* DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE */
51
52#endif /* ! BFD_ASSEMBLER */
53
54extern const pseudo_typeS aout_pseudo_table[];
55
56#ifndef obj_pop_insert
57#define obj_pop_insert() pop_insert (aout_pseudo_table)
58#endif
59
60/* SYMBOL TABLE */
61/* Symbol table entry data type */
62
63typedef struct nlist obj_symbol_type;	/* Symbol table entry */
64
65/* Symbol table macros and constants */
66
67#ifdef BFD_ASSEMBLER
68
69#define S_SET_OTHER(S,V) \
70  (aout_symbol (symbol_get_bfdsym (S))->other = (V))
71#define S_SET_TYPE(S,T) \
72  (aout_symbol (symbol_get_bfdsym (S))->type = (T))
73#define S_SET_DESC(S,D)	\
74  (aout_symbol (symbol_get_bfdsym (S))->desc = (D))
75#define S_GET_OTHER(S) \
76  (aout_symbol (symbol_get_bfdsym (S))->other)
77#define S_GET_TYPE(S) \
78  (aout_symbol (symbol_get_bfdsym (S))->type)
79#define S_GET_DESC(S) \
80  (aout_symbol (symbol_get_bfdsym (S))->desc)
81
82asection *text_section, *data_section, *bss_section;
83
84#define obj_frob_symbol(S,PUNT)	obj_aout_frob_symbol (S, &PUNT)
85#define obj_frob_file()		obj_aout_frob_file ()
86extern void obj_aout_frob_symbol PARAMS ((symbolS *, int *));
87extern void obj_aout_frob_file PARAMS ((void));
88
89#define obj_sec_sym_ok_for_reloc(SEC)	(1)
90
91#else
92
93/* We use the sy_obj field to record whether a symbol is weak.  */
94#define OBJ_SYMFIELD_TYPE char
95
96/*
97 *  Macros to extract information from a symbol table entry.
98 *  This syntaxic indirection allows independence regarding a.out or coff.
99 *  The argument (s) of all these macros is a pointer to a symbol table entry.
100 */
101
102/* True if the symbol is external */
103#define S_IS_EXTERNAL(s)	((s)->sy_symbol.n_type & N_EXT)
104
105/* True if symbol has been defined, ie is in N_{TEXT,DATA,BSS,ABS} or N_EXT */
106#define S_IS_DEFINED(s) \
107  (S_GET_TYPE (s) != N_UNDF || S_GET_DESC (s) != 0)
108
109#define S_IS_COMMON(s) \
110  (S_GET_TYPE (s) == N_UNDF && S_GET_VALUE (s) != 0)
111
112#define S_IS_REGISTER(s)	((s)->sy_symbol.n_type == N_REGISTER)
113
114/* True if a debug special symbol entry */
115#define S_IS_DEBUG(s)		((s)->sy_symbol.n_type & N_STAB)
116/* True if a symbol is local symbol name */
117#define S_IS_LOCAL(s) 					\
118  ((S_GET_NAME (s) 					\
119    && !S_IS_DEBUG (s) 					\
120    && (strchr (S_GET_NAME (s), '\001') != NULL		\
121        || strchr (S_GET_NAME (s), '\002') != NULL	\
122        || (S_LOCAL_NAME(s) && !flag_keep_locals)))	\
123   || (flag_strip_local_absolute			\
124       && ! S_IS_EXTERNAL(s)				\
125       && S_GET_SEGMENT (s) == absolute_section))
126/* True if a symbol is not defined in this file */
127#define S_IS_EXTERN(s)		((s)->sy_symbol.n_type & N_EXT)
128/* True if the symbol has been generated because of a .stabd directive */
129#define S_IS_STABD(s)		(S_GET_NAME(s) == (char *)0)
130
131/* Accessors */
132/* The name of the symbol */
133#define S_GET_NAME(s)		((s)->sy_symbol.n_un.n_name)
134/* The pointer to the string table */
135#define S_GET_OFFSET(s)		((s)->sy_symbol.n_un.n_strx)
136/* The type of the symbol */
137#define S_GET_TYPE(s)		((s)->sy_symbol.n_type & N_TYPE)
138/* The numeric value of the segment */
139#define S_GET_SEGMENT(s)	(N_TYPE_seg[S_GET_TYPE(s)])
140/* The n_other expression value */
141#define S_GET_OTHER(s)		((s)->sy_symbol.n_other)
142/* The n_desc expression value */
143#define S_GET_DESC(s)		((s)->sy_symbol.n_desc)
144/* Whether the symbol is weak.  */
145#define S_GET_WEAK(s)		((s)->sy_obj)
146
147/* Modifiers */
148/* Assume that a symbol cannot be simultaneously in more than on segment */
149/* set segment */
150#define S_SET_SEGMENT(s,seg)	((s)->sy_symbol.n_type &= ~N_TYPE,(s)->sy_symbol.n_type|=SEGMENT_TO_SYMBOL_TYPE(seg))
151/* The symbol is external */
152#define S_SET_EXTERNAL(s)	((s)->sy_symbol.n_type |= N_EXT)
153/* The symbol is not external */
154#define S_CLEAR_EXTERNAL(s)	((s)->sy_symbol.n_type &= ~N_EXT)
155/* Set the name of the symbol */
156#define S_SET_NAME(s,v)		((s)->sy_symbol.n_un.n_name = (v))
157/* Set the offset in the string table */
158#define S_SET_OFFSET(s,v)	((s)->sy_symbol.n_un.n_strx = (v))
159/* Set the n_type field */
160#define S_SET_TYPE(s,t)		((s)->sy_symbol.n_type = (t))
161/* Set the n_other expression value */
162#define S_SET_OTHER(s,v)	((s)->sy_symbol.n_other = (v))
163/* Set the n_desc expression value */
164#define S_SET_DESC(s,v)		((s)->sy_symbol.n_desc = (v))
165/* Mark the symbol as weak.  This causes n_type to be adjusted when
166   the symbol is written out.  */
167#define S_SET_WEAK(s)		((s)->sy_obj = 1)
168
169/* File header macro and type definition */
170
171#define H_GET_FILE_SIZE(h)	(H_GET_HEADER_SIZE(h) \
172				 + H_GET_TEXT_SIZE(h) \
173				 + H_GET_DATA_SIZE(h) \
174				 + H_GET_SYMBOL_TABLE_SIZE(h) \
175				 + H_GET_TEXT_RELOCATION_SIZE(h) \
176				 + H_GET_DATA_RELOCATION_SIZE(h) \
177				 + H_GET_STRING_SIZE(h))
178
179#define H_GET_HEADER_SIZE(h)		(EXEC_BYTES_SIZE)
180#define H_GET_TEXT_SIZE(h)		((h)->header.a_text)
181#define H_GET_DATA_SIZE(h)		((h)->header.a_data)
182#define H_GET_BSS_SIZE(h)		((h)->header.a_bss)
183#define H_GET_TEXT_RELOCATION_SIZE(h)	((h)->header.a_trsize)
184#define H_GET_DATA_RELOCATION_SIZE(h)	((h)->header.a_drsize)
185#define H_GET_SYMBOL_TABLE_SIZE(h)	((h)->header.a_syms)
186#define H_GET_ENTRY_POINT(h)		((h)->header.a_entry)
187#define H_GET_STRING_SIZE(h)		((h)->string_table_size)
188#define H_GET_LINENO_SIZE(h)		(0)
189
190#define H_GET_DYNAMIC(h)		((h)->header.a_info >> 31)
191#define H_GET_VERSION(h)		(((h)->header.a_info >> 24) & 0x7f)
192#define H_GET_MACHTYPE(h)		(((h)->header.a_info >> 16) & 0xff)
193#define H_GET_MAGIC_NUMBER(h)		((h)->header.a_info & 0xffff)
194
195#define H_SET_DYNAMIC(h,v)		((h)->header.a_info = (((v) << 31) \
196							       | (H_GET_VERSION(h) << 24) \
197							       | (H_GET_MACHTYPE(h) << 16) \
198							       | (H_GET_MAGIC_NUMBER(h))))
199
200#define H_SET_VERSION(h,v)		((h)->header.a_info = ((H_GET_DYNAMIC(h) << 31) \
201							       | ((v) << 24) \
202							       | (H_GET_MACHTYPE(h) << 16) \
203							       | (H_GET_MAGIC_NUMBER(h))))
204
205#define H_SET_MACHTYPE(h,v)		((h)->header.a_info = ((H_GET_DYNAMIC(h) << 31) \
206							       | (H_GET_VERSION(h) << 24) \
207							       | ((v) << 16) \
208							       | (H_GET_MAGIC_NUMBER(h))))
209
210#define H_SET_MAGIC_NUMBER(h,v)		((h)->header.a_info = ((H_GET_DYNAMIC(h) << 31) \
211							       | (H_GET_VERSION(h) << 24) \
212							       | (H_GET_MACHTYPE(h) << 16) \
213							       | ((v))))
214
215#define H_SET_TEXT_SIZE(h,v)		((h)->header.a_text = md_section_align(SEG_TEXT, (v)))
216#define H_SET_DATA_SIZE(h,v)		((h)->header.a_data = md_section_align(SEG_DATA, (v)))
217#define H_SET_BSS_SIZE(h,v)		((h)->header.a_bss = md_section_align(SEG_BSS, (v)))
218
219#define H_SET_RELOCATION_SIZE(h,t,d)	(H_SET_TEXT_RELOCATION_SIZE((h),(t)),\
220					 H_SET_DATA_RELOCATION_SIZE((h),(d)))
221
222#define H_SET_TEXT_RELOCATION_SIZE(h,v)	((h)->header.a_trsize = (v))
223#define H_SET_DATA_RELOCATION_SIZE(h,v)	((h)->header.a_drsize = (v))
224#define H_SET_SYMBOL_TABLE_SIZE(h,v)	((h)->header.a_syms = (v) * 12)
225
226#define H_SET_ENTRY_POINT(h,v)		((h)->header.a_entry = (v))
227#define H_SET_STRING_SIZE(h,v)		((h)->string_table_size = (v))
228
229typedef struct
230  {
231    struct exec header;		/* a.out header */
232    long string_table_size;	/* names + '\0' + sizeof (int) */
233  }
234
235object_headers;
236
237/* line numbering stuff.  */
238#define OBJ_EMIT_LINENO(a, b, c)	{;}
239
240struct fix;
241void tc_aout_fix_to_chars PARAMS ((char *where, struct fix *fixP, relax_addressT segment_address));
242
243#endif
244
245#define obj_read_begin_hook()	{;}
246#define obj_symbol_new_hook(s)	{;}
247
248#define EMIT_SECTION_SYMBOLS		0
249
250#define AOUT_STABS
251