1 /* a.out object file format
2 Copyright (C) 1989, 1990, 1991 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
8 published by the Free Software Foundation; either version 2,
9 or (at your option) any later version.
11 GAS is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 the GNU General Public License for more details.
16 You should have received a copy of the GNU General Public
17 License along with GAS; see the file COPYING. If not, write
18 to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #include "aout/aout64.h"
27 /* in: segT out: N_TYPE bits */
28 const short seg_N_TYPE
[] =
36 N_UNDF
, /* expression */
40 N_REGISTER
, /* register */
43 const segT N_TYPE_seg
[N_TYPE
+ 2] =
44 { /* N_TYPE == 0x1E = 32-2 */
45 SEG_UNKNOWN
, /* N_UNDF == 0 */
47 SEG_ABSOLUTE
, /* N_ABS == 2 */
49 SEG_TEXT
, /* N_TEXT == 4 */
51 SEG_DATA
, /* N_DATA == 6 */
53 SEG_BSS
, /* N_BSS == 8 */
55 SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
,
56 SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
,
57 SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
,
58 SEG_REGISTER
, /* dummy N_REGISTER for regs = 30 */
63 static void obj_aout_line
PARAMS ((int));
65 const pseudo_typeS obj_pseudo_table
[] =
67 {"line", obj_aout_line
, 0}, /* source code line number */
68 {"ln", obj_aout_line
, 0}, /* coff line number that we use anyway */
70 /* coff debug pseudos (ignored) */
73 {"endef", s_ignore
, 0},
74 {"ident", s_ignore
, 0},
75 {"line", s_ignore
, 0},
78 {"size", s_ignore
, 0},
80 {"type", s_ignore
, 0},
82 {"version", s_ignore
, 0},
84 {"optim", s_ignore
, 0}, /* For sun386i cc (?) */
87 {"ABORT", s_abort
, 0},
89 {NULL
} /* end sentinel */
90 }; /* obj_pseudo_table */
96 obj_aout_frob_symbol (sym
, punt
)
102 int desc
, type
, other
;
104 flags
= sym
->bsym
->flags
;
105 desc
= S_GET_DESC (sym
);
106 type
= S_GET_TYPE (sym
);
107 other
= S_GET_OTHER (sym
);
108 sec
= sym
->bsym
->section
;
110 /* Only frob simple symbols this way right now. */
111 if (! (type
& ~ (N_TYPE
| N_EXT
)))
113 if (type
== (N_UNDF
| N_EXT
)
114 && sec
== &bfd_abs_section
)
115 sym
->bsym
->section
= sec
= &bfd_und_section
;
117 if ((type
& N_TYPE
) != N_INDR
118 && (sec
== &bfd_abs_section
119 || sec
== &bfd_und_section
))
121 if (flags
& BSF_EXPORT
)
124 switch (type
& N_TYPE
)
130 /* Set the debugging flag for constructor symbols so that
131 BFD leaves them alone. */
132 sym
->bsym
->flags
|= BSF_DEBUGGING
;
135 /* Put indirect symbols in the indirect section. */
136 sym
->bsym
->section
= &bfd_ind_section
;
137 sym
->bsym
->flags
|= BSF_INDIRECT
;
143 sym
->bsym
->flags
|= BSF_DEBUGGING
;
146 S_SET_TYPE (sym
, type
);
156 * Crawl along a fixS chain. Emit the segment's relocations.
159 obj_emit_relocations (where
, fixP
, segment_address_in_file
)
161 fixS
*fixP
; /* Fixup chain for this segment. */
162 relax_addressT segment_address_in_file
;
164 for (; fixP
; fixP
= fixP
->fx_next
)
165 if (fixP
->fx_addsy
!= NULL
)
167 tc_aout_fix_to_chars (*where
, fixP
, segment_address_in_file
);
168 *where
+= md_reloc_size
;
172 #ifndef obj_header_append
173 /* Aout file generation & utilities */
175 obj_header_append (where
, headers
)
177 object_headers
*headers
;
179 tc_headers_hook (headers
);
182 md_number_to_chars (*where
, headers
->header
.a_info
, sizeof (headers
->header
.a_info
));
183 *where
+= sizeof (headers
->header
.a_info
);
184 md_number_to_chars (*where
, headers
->header
.a_text
, sizeof (headers
->header
.a_text
));
185 *where
+= sizeof (headers
->header
.a_text
);
186 md_number_to_chars (*where
, headers
->header
.a_data
, sizeof (headers
->header
.a_data
));
187 *where
+= sizeof (headers
->header
.a_data
);
188 md_number_to_chars (*where
, headers
->header
.a_bss
, sizeof (headers
->header
.a_bss
));
189 *where
+= sizeof (headers
->header
.a_bss
);
190 md_number_to_chars (*where
, headers
->header
.a_syms
, sizeof (headers
->header
.a_syms
));
191 *where
+= sizeof (headers
->header
.a_syms
);
192 md_number_to_chars (*where
, headers
->header
.a_entry
, sizeof (headers
->header
.a_entry
));
193 *where
+= sizeof (headers
->header
.a_entry
);
194 md_number_to_chars (*where
, headers
->header
.a_trsize
, sizeof (headers
->header
.a_trsize
));
195 *where
+= sizeof (headers
->header
.a_trsize
);
196 md_number_to_chars (*where
, headers
->header
.a_drsize
, sizeof (headers
->header
.a_drsize
));
197 *where
+= sizeof (headers
->header
.a_drsize
);
199 #else /* CROSS_COMPILE */
201 append (where
, (char *) &headers
->header
, sizeof (headers
->header
));
202 #endif /* CROSS_COMPILE */
208 obj_symbol_to_chars (where
, symbolP
)
212 md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP
)), S_GET_OFFSET (symbolP
), sizeof (S_GET_OFFSET (symbolP
)));
213 md_number_to_chars ((char *) &(S_GET_DESC (symbolP
)), S_GET_DESC (symbolP
), sizeof (S_GET_DESC (symbolP
)));
214 md_number_to_chars ((char *) &(symbolP
->sy_symbol
.n_value
), S_GET_VALUE (symbolP
), sizeof (symbolP
->sy_symbol
.n_value
));
216 append (where
, (char *) &symbolP
->sy_symbol
, sizeof (obj_symbol_type
));
220 obj_emit_symbols (where
, symbol_rootP
)
222 symbolS
*symbol_rootP
;
226 /* Emit all symbols left in the symbol chain. */
227 for (symbolP
= symbol_rootP
; symbolP
; symbolP
= symbol_next (symbolP
))
229 /* Used to save the offset of the name. It is used to point
230 to the string in memory but must be a file offset. */
233 temp
= S_GET_NAME (symbolP
);
234 S_SET_OFFSET (symbolP
, symbolP
->sy_name_offset
);
236 /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
237 if (!S_IS_DEBUG (symbolP
) && !S_IS_DEFINED (symbolP
))
238 S_SET_EXTERNAL (symbolP
);
240 obj_symbol_to_chars (where
, symbolP
);
241 S_SET_NAME (symbolP
, temp
);
245 #endif /* ! BFD_ASSEMBLER */
248 obj_aout_line (ignore
)
251 /* Assume delimiter is part of expression.
252 BSD4.2 as fails with delightful bug, so we
253 are not being incompatible here. */
254 new_logical_line ((char *) NULL
, (int) (get_absolute_expression ()));
255 demand_empty_rest_of_line ();
256 } /* obj_aout_line() */
259 obj_read_begin_hook ()
263 #ifndef BFD_ASSEMBLER
266 obj_crawl_symbol_chain (headers
)
267 object_headers
*headers
;
271 int symbol_number
= 0;
273 tc_crawl_symbol_chain (headers
);
275 symbolPP
= &symbol_rootP
; /*->last symbol chain link. */
276 while ((symbolP
= *symbolPP
) != NULL
)
278 if (flagseen
['R'] && (S_GET_SEGMENT (symbolP
) == SEG_DATA
))
280 S_SET_SEGMENT (symbolP
, SEG_TEXT
);
281 } /* if pusing data into text */
283 resolve_symbol_value (symbolP
);
285 /* OK, here is how we decide which symbols go out into the brave
286 new symtab. Symbols that do are:
288 * symbols with no name (stabd's?)
289 * symbols with debug info in their N_TYPE
291 Symbols that don't are:
292 * symbols that are registers
293 * symbols with \1 as their 3rd character (numeric labels)
294 * "local labels" as defined by S_LOCAL_NAME(name) if the -L
295 switch was passed to gas.
297 All other symbols are output. We complain if a deleted
298 symbol was marked external. */
301 if (!S_IS_REGISTER (symbolP
)
302 && (!S_GET_NAME (symbolP
)
303 || S_IS_DEBUG (symbolP
)
305 /* FIXME-SOON this ifdef seems highly dubious to me. xoxorich. */
306 || !S_IS_DEFINED (symbolP
)
307 || S_IS_EXTERNAL (symbolP
)
309 || (S_GET_NAME (symbolP
)[0] != '\001' && (flagseen
['L'] || !S_LOCAL_NAME (symbolP
)))))
311 symbolP
->sy_number
= symbol_number
++;
313 /* The + 1 after strlen account for the \0 at the
314 end of each string */
315 if (!S_IS_STABD (symbolP
))
318 symbolP
->sy_name_offset
= string_byte_count
;
319 string_byte_count
+= strlen (S_GET_NAME (symbolP
)) + 1;
321 else /* .Stabd case. */
322 symbolP
->sy_name_offset
= 0;
323 symbolPP
= &(symbol_next (symbolP
));
327 if (S_IS_EXTERNAL (symbolP
) || !S_IS_DEFINED (symbolP
))
329 as_bad ("Local symbol %s never defined.", decode_local_label_name (S_GET_NAME (symbolP
)));
332 /* Unhook it from the chain */
333 *symbolPP
= symbol_next (symbolP
);
334 } /* if this symbol should be in the output */
335 } /* for each symbol */
337 H_SET_SYMBOL_TABLE_SIZE (headers
, symbol_number
);
341 * Find strings by crawling along symbol table chain.
345 obj_emit_strings (where
)
351 /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
352 md_number_to_chars (*where
, string_byte_count
, sizeof (string_byte_count
));
353 *where
+= sizeof (string_byte_count
);
354 #else /* CROSS_COMPILE */
355 append (where
, (char *) &string_byte_count
, (unsigned long) sizeof (string_byte_count
));
356 #endif /* CROSS_COMPILE */
358 for (symbolP
= symbol_rootP
; symbolP
; symbolP
= symbol_next (symbolP
))
360 if (S_GET_NAME (symbolP
))
361 append (&next_object_file_charP
, S_GET_NAME (symbolP
),
362 (unsigned long) (strlen (S_GET_NAME (symbolP
)) + 1));
363 } /* walk symbol chain */
367 #define AOUT_VERSION 0
371 obj_pre_write_hook (headers
)
372 object_headers
*headers
;
374 H_SET_DYNAMIC (headers
, 0);
375 H_SET_VERSION (headers
, AOUT_VERSION
);
376 H_SET_MACHTYPE (headers
, AOUT_MACHTYPE
);
377 tc_aout_pre_write_hook (headers
);
383 /* Strip out the section name */
385 char *section_name_end
;
392 section_name
= input_line_pointer
;
393 c
= get_symbol_end ();
394 section_name_end
= input_line_pointer
;
396 len
= section_name_end
- section_name
;
397 input_line_pointer
++;
398 save
= input_line_pointer
;
403 exp
= get_absolute_expression ();
405 else if (*input_line_pointer
== ',')
407 input_line_pointer
++;
408 exp
= get_absolute_expression ();
412 input_line_pointer
= save
;
417 as_bad ("subsegment index too high");
420 if (strcmp (section_name
, ".text") == 0)
422 subseg_set (SEG_TEXT
, (subsegT
) exp
);
425 if (strcmp (section_name
, ".data") == 0)
428 subseg_set (SEG_TEXT
, (subsegT
) exp
+ 1000);
430 subseg_set (SEG_DATA
, (subsegT
) exp
);
433 *section_name_end
= c
;
436 #endif /* ! BFD_ASSEMBLER */
438 /* end of obj-aout.c */