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. */
21 #include "aout/stab_gnu.h"
25 /* in: segT out: N_TYPE bits */
26 const short seg_N_TYPE
[] =
36 N_UNDF
, /* bignum/flonum */
37 N_UNDF
, /* difference */
41 N_REGISTER
, /* register */
44 const segT N_TYPE_seg
[N_TYPE
+ 2] =
45 { /* N_TYPE == 0x1E = 32-2 */
46 SEG_UNKNOWN
, /* N_UNDF == 0 */
48 SEG_ABSOLUTE
, /* N_ABS == 2 */
50 SEG_TEXT
, /* N_TEXT == 4 */
52 SEG_DATA
, /* N_DATA == 6 */
54 SEG_BSS
, /* N_BSS == 8 */
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
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
,
58 SEG_GOOF
, SEG_GOOF
, SEG_GOOF
, SEG_GOOF
,
59 SEG_REGISTER
, /* dummy N_REGISTER for regs = 30 */
64 static void obj_aout_stab
PARAMS ((int what
));
65 static void obj_aout_line
PARAMS ((void));
66 static void obj_aout_desc
PARAMS ((void));
68 const pseudo_typeS obj_pseudo_table
[] =
70 /* stabs debug info */
71 {"line", obj_aout_line
, 0}, /* source code line number */
72 {"ln", obj_aout_line
, 0}, /* coff line number that we use anyway */
73 {"desc", obj_aout_desc
, 0}, /* desc */
74 {"stabd", obj_aout_stab
, 'd'},/* stabs */
75 {"stabn", obj_aout_stab
, 'n'},/* stabs */
76 {"stabs", obj_aout_stab
, 's'},/* stabs */
78 /* coff debug pseudos (ignored) */
81 {"endef", s_ignore
, 0},
82 {"ident", s_ignore
, 0},
83 {"line", s_ignore
, 0},
86 {"size", s_ignore
, 0},
88 {"type", s_ignore
, 0},
90 {"version", s_ignore
, 0},
92 /* stabs-in-coff (?) debug pseudos (ignored) */
93 {"optim", s_ignore
, 0}, /* For sun386i cc (?) */
96 {"ABORT", s_abort
, 0},
98 {NULL
} /* end sentinel */
99 }; /* obj_pseudo_table */
105 obj_aout_frob_symbol (sym
, punt
)
111 int desc
, type
, other
;
113 flags
= sym
->bsym
->flags
;
114 desc
= S_GET_DESC (sym
);
115 type
= S_GET_TYPE (sym
);
116 other
= S_GET_OTHER (sym
);
117 sec
= sym
->bsym
->section
;
119 /* Only frob simple symbols this way right now. */
120 if (! (type
& ~0x1f))
122 if (sec
== &bfd_abs_section
123 || sec
== &bfd_und_section
)
125 if (flags
& BSF_EXPORT
)
130 sym
->bsym
->flags
|= BSF_DEBUGGING
;
133 S_SET_TYPE (sym
, type
);
143 * Crawl along a fixS chain. Emit the segment's relocations.
146 obj_emit_relocations (where
, fixP
, segment_address_in_file
)
148 fixS
*fixP
; /* Fixup chain for this segment. */
149 relax_addressT segment_address_in_file
;
151 for (; fixP
; fixP
= fixP
->fx_next
)
152 if (fixP
->fx_addsy
!= NULL
)
154 tc_aout_fix_to_chars (*where
, fixP
, segment_address_in_file
);
155 *where
+= md_reloc_size
;
159 #ifndef obj_header_append
160 /* Aout file generation & utilities */
162 obj_header_append (where
, headers
)
164 object_headers
*headers
;
166 tc_headers_hook (headers
);
169 md_number_to_chars (*where
, headers
->header
.a_info
, sizeof (headers
->header
.a_info
));
170 *where
+= sizeof (headers
->header
.a_info
);
171 md_number_to_chars (*where
, headers
->header
.a_text
, sizeof (headers
->header
.a_text
));
172 *where
+= sizeof (headers
->header
.a_text
);
173 md_number_to_chars (*where
, headers
->header
.a_data
, sizeof (headers
->header
.a_data
));
174 *where
+= sizeof (headers
->header
.a_data
);
175 md_number_to_chars (*where
, headers
->header
.a_bss
, sizeof (headers
->header
.a_bss
));
176 *where
+= sizeof (headers
->header
.a_bss
);
177 md_number_to_chars (*where
, headers
->header
.a_syms
, sizeof (headers
->header
.a_syms
));
178 *where
+= sizeof (headers
->header
.a_syms
);
179 md_number_to_chars (*where
, headers
->header
.a_entry
, sizeof (headers
->header
.a_entry
));
180 *where
+= sizeof (headers
->header
.a_entry
);
181 md_number_to_chars (*where
, headers
->header
.a_trsize
, sizeof (headers
->header
.a_trsize
));
182 *where
+= sizeof (headers
->header
.a_trsize
);
183 md_number_to_chars (*where
, headers
->header
.a_drsize
, sizeof (headers
->header
.a_drsize
));
184 *where
+= sizeof (headers
->header
.a_drsize
);
186 #else /* CROSS_COMPILE */
188 append (where
, (char *) &headers
->header
, sizeof (headers
->header
));
189 #endif /* CROSS_COMPILE */
195 obj_symbol_to_chars (where
, symbolP
)
199 md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP
)), S_GET_OFFSET (symbolP
), sizeof (S_GET_OFFSET (symbolP
)));
200 md_number_to_chars ((char *) &(S_GET_DESC (symbolP
)), S_GET_DESC (symbolP
), sizeof (S_GET_DESC (symbolP
)));
201 md_number_to_chars ((char *) &(symbolP
->sy_symbol
.n_value
), S_GET_VALUE (symbolP
), sizeof (symbolP
->sy_symbol
.n_value
));
203 append (where
, (char *) &symbolP
->sy_symbol
, sizeof (obj_symbol_type
));
207 obj_emit_symbols (where
, symbol_rootP
)
209 symbolS
*symbol_rootP
;
213 /* Emit all symbols left in the symbol chain. */
214 for (symbolP
= symbol_rootP
; symbolP
; symbolP
= symbol_next (symbolP
))
216 /* Used to save the offset of the name. It is used to point
217 to the string in memory but must be a file offset. */
220 temp
= S_GET_NAME (symbolP
);
221 S_SET_OFFSET (symbolP
, symbolP
->sy_name_offset
);
223 /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
224 if (!S_IS_DEBUG (symbolP
) && !S_IS_DEFINED (symbolP
))
225 S_SET_EXTERNAL (symbolP
);
227 obj_symbol_to_chars (where
, symbolP
);
228 S_SET_NAME (symbolP
, temp
);
232 #endif /* ! BFD_ASSEMBLER */
237 /* Assume delimiter is part of expression.
238 BSD4.2 as fails with delightful bug, so we
239 are not being incompatible here. */
240 new_logical_line ((char *) NULL
, (int) (get_absolute_expression ()));
241 demand_empty_rest_of_line ();
242 } /* obj_aout_line() */
247 * Handle .stabX directives, which used to be open-coded.
248 * So much creeping featurism overloaded the semantics that we decided
249 * to put all .stabX thinking in one place. Here.
251 * We try to make any .stabX directive legal. Other people's AS will often
252 * do assembly-time consistency checks: eg assigning meaning to n_type bits
253 * and "protecting" you from setting them to certain values. (They also zero
254 * certain bits before emitting symbols. Tut tut.)
256 * If an expression is not absolute we either gripe or use the relocation
257 * information. Other people's assemblers silently forget information they
258 * don't need and invent information they need that you didn't supply.
260 * .stabX directives always make a symbol table entry. It may be junk if
261 * the rest of your .stabX directive is malformed.
269 register symbolS
*symbolP
= 0;
270 register char *string
;
273 int goof
; /* TRUE if we have aborted. */
277 * Enter with input_line_pointer pointing past .stabX and any following
280 goof
= 0; /* JF who forgot this?? */
283 string
= demand_copy_C_string (&length
);
285 if (*input_line_pointer
== ',')
286 input_line_pointer
++;
289 as_bad ("I need a comma after symbol's name");
297 * Input_line_pointer->after ','. String->symbol name.
301 symbolP
= symbol_new (string
, undefined_section
, 0, (struct frag
*) 0);
305 S_SET_NAME (symbolP
, NULL
); /* .stabd feature. */
306 S_SET_VALUE (symbolP
, (char*) obstack_next_free (&frags
) - frag_now
->fr_literal
);
307 symbolP
->sy_frag
= frag_now
;
311 symbolP
->sy_frag
= &zero_address_frag
;
315 symbolP
->sy_frag
= &zero_address_frag
;
323 if (get_absolute_expression_and_terminator (&longint
) == ',')
325 saved_type
= longint
;
326 S_SET_TYPE (symbolP
, saved_type
);
330 as_bad ("I want a comma after the n_type expression");
332 input_line_pointer
--; /* Backup over a non-',' char. */
338 if (get_absolute_expression_and_terminator (&longint
) == ',')
339 S_SET_OTHER (symbolP
, longint
);
342 as_bad ("I want a comma after the n_other expression");
344 input_line_pointer
--; /* Backup over a non-',' char. */
350 S_SET_DESC (symbolP
, get_absolute_expression ());
351 if (what
== 's' || what
== 'n')
353 if (*input_line_pointer
!= ',')
355 as_bad ("I want a comma after the n_desc expression");
360 input_line_pointer
++;
365 if ((!goof
) && (what
== 's' || what
== 'n'))
367 pseudo_set (symbolP
);
368 S_SET_TYPE (symbolP
, saved_type
);
371 if (listing
&& !goof
)
373 if (S_GET_TYPE (symbolP
) == N_SLINE
)
375 listing_source_line (S_GET_DESC (symbolP
));
377 else if (S_GET_TYPE (symbolP
) == N_SO
|| S_GET_TYPE (symbolP
) == N_SOL
)
379 listing_source_file (string
);
385 ignore_rest_of_line ();
387 demand_empty_rest_of_line ();
388 } /* obj_aout_stab() */
396 register symbolS
*symbolP
;
400 * Frob invented at RMS' request. Set the n_desc of a symbol.
402 name
= input_line_pointer
;
403 c
= get_symbol_end ();
404 p
= input_line_pointer
;
407 if (*input_line_pointer
!= ',')
410 as_bad ("Expected comma after name \"%s\"", name
);
412 ignore_rest_of_line ();
416 input_line_pointer
++;
417 temp
= get_absolute_expression ();
419 symbolP
= symbol_find_or_make (name
);
421 S_SET_DESC (symbolP
, temp
);
423 demand_empty_rest_of_line ();
424 } /* obj_aout_desc() */
427 obj_read_begin_hook ()
430 } /* obj_read_begin_hook() */
432 #ifndef BFD_ASSEMBLER
435 obj_crawl_symbol_chain (headers
)
436 object_headers
*headers
;
440 int symbol_number
= 0;
442 tc_crawl_symbol_chain (headers
);
444 symbolPP
= &symbol_rootP
; /*->last symbol chain link. */
445 while ((symbolP
= *symbolPP
) != NULL
)
447 if (flagseen
['R'] && (S_GET_SEGMENT (symbolP
) == SEG_DATA
))
449 S_SET_SEGMENT (symbolP
, SEG_TEXT
);
450 } /* if pusing data into text */
452 resolve_symbol_value (symbolP
);
454 /* OK, here is how we decide which symbols go out into the brave
455 new symtab. Symbols that do are:
457 * symbols with no name (stabd's?)
458 * symbols with debug info in their N_TYPE
460 Symbols that don't are:
461 * symbols that are registers
462 * symbols with \1 as their 3rd character (numeric labels)
463 * "local labels" as defined by S_LOCAL_NAME(name) if the -L
464 switch was passed to gas.
466 All other symbols are output. We complain if a deleted
467 symbol was marked external. */
470 if (!S_IS_REGISTER (symbolP
)
471 && (!S_GET_NAME (symbolP
)
472 || S_IS_DEBUG (symbolP
)
474 /* FIXME-SOON this ifdef seems highly dubious to me. xoxorich. */
475 || !S_IS_DEFINED (symbolP
)
476 || S_IS_EXTERNAL (symbolP
)
478 || (S_GET_NAME (symbolP
)[0] != '\001' && (flagseen
['L'] || !S_LOCAL_NAME (symbolP
)))))
480 symbolP
->sy_number
= symbol_number
++;
482 /* The + 1 after strlen account for the \0 at the
483 end of each string */
484 if (!S_IS_STABD (symbolP
))
487 symbolP
->sy_name_offset
= string_byte_count
;
488 string_byte_count
+= strlen (S_GET_NAME (symbolP
)) + 1;
490 else /* .Stabd case. */
491 symbolP
->sy_name_offset
= 0;
492 symbolPP
= &(symbol_next (symbolP
));
496 if (S_IS_EXTERNAL (symbolP
) || !S_IS_DEFINED (symbolP
))
498 as_bad ("Local symbol %s never defined.", decode_local_label_name (S_GET_NAME (symbolP
)));
501 /* Unhook it from the chain */
502 *symbolPP
= symbol_next (symbolP
);
503 } /* if this symbol should be in the output */
504 } /* for each symbol */
506 H_SET_SYMBOL_TABLE_SIZE (headers
, symbol_number
);
509 } /* obj_crawl_symbol_chain() */
512 * Find strings by crawling along symbol table chain.
516 obj_emit_strings (where
)
522 /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
523 md_number_to_chars (*where
, string_byte_count
, sizeof (string_byte_count
));
524 *where
+= sizeof (string_byte_count
);
525 #else /* CROSS_COMPILE */
526 append (where
, (char *) &string_byte_count
, (unsigned long) sizeof (string_byte_count
));
527 #endif /* CROSS_COMPILE */
529 for (symbolP
= symbol_rootP
; symbolP
; symbolP
= symbol_next (symbolP
))
531 if (S_GET_NAME (symbolP
))
532 append (&next_object_file_charP
, S_GET_NAME (symbolP
),
533 (unsigned long) (strlen (S_GET_NAME (symbolP
)) + 1));
534 } /* walk symbol chain */
537 } /* obj_emit_strings() */
540 #define AOUT_VERSION 0
544 obj_pre_write_hook (headers
)
545 object_headers
*headers
;
547 H_SET_DYNAMIC (headers
, 0);
548 H_SET_VERSION (headers
, AOUT_VERSION
);
549 H_SET_MACHTYPE (headers
, AOUT_MACHTYPE
);
550 tc_aout_pre_write_hook (headers
);
552 } /* obj_pre_write_hook() */
557 /* Strip out the section name */
559 char *section_name_end
;
566 section_name
= input_line_pointer
;
567 c
= get_symbol_end ();
568 section_name_end
= input_line_pointer
;
570 len
= section_name_end
- section_name
;
571 input_line_pointer
++;
572 save
= input_line_pointer
;
577 exp
= get_absolute_expression ();
579 else if (*input_line_pointer
== ',')
581 input_line_pointer
++;
582 exp
= get_absolute_expression ();
586 input_line_pointer
= save
;
591 as_bad ("subsegment index too high");
594 if (strcmp (section_name
, ".text") == 0)
596 subseg_new (SEG_TEXT
, (subsegT
) exp
);
599 if (strcmp (section_name
, ".data") == 0)
602 subseg_new (SEG_TEXT
, (subsegT
) exp
+ 1000);
604 subseg_new (SEG_DATA
, (subsegT
) exp
);
607 *section_name_end
= c
;
610 #endif /* ! BFD_ASSEMBLER */
612 /* end of obj-aout.c */