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. */
23 #include "aout/aout64.h"
28 /* in: segT out: N_TYPE bits */
29 const short seg_N_TYPE[] =
37 N_UNDF, /* expression */
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_line PARAMS ((int));
65 static void obj_aout_weak PARAMS ((int));
67 const pseudo_typeS obj_pseudo_table[] =
69 {"line", obj_aout_line, 0}, /* source code line number */
70 {"ln", obj_aout_line, 0}, /* coff line number that we use anyway */
72 {"weak", obj_aout_weak, 0}, /* mark symbol as weak. */
74 /* coff debug pseudos (ignored) */
77 {"endef", s_ignore, 0},
78 {"ident", s_ignore, 0},
79 {"line", s_ignore, 0},
82 {"size", s_ignore, 0},
84 {"type", s_ignore, 0},
86 {"version", s_ignore, 0},
88 {"optim", s_ignore, 0}, /* For sun386i cc (?) */
91 {"ABORT", s_abort, 0},
93 {NULL} /* end sentinel */
94 }; /* obj_pseudo_table */
100 obj_aout_frob_symbol (sym, punt)
106 int desc, type, other;
108 flags = sym->bsym->flags;
109 desc = S_GET_DESC (sym);
110 type = S_GET_TYPE (sym);
111 other = S_GET_OTHER (sym);
112 sec = sym->bsym->section;
114 /* Only frob simple symbols this way right now. */
115 if (! (type & ~ (N_TYPE | N_EXT)))
117 if (type == (N_UNDF | N_EXT)
118 && sec == &bfd_abs_section)
119 sym->bsym->section = sec = &bfd_und_section;
121 if ((type & N_TYPE) != N_INDR
122 && (type & N_TYPE) != N_SETA
123 && (type & N_TYPE) != N_SETT
124 && (type & N_TYPE) != N_SETD
125 && (type & N_TYPE) != N_SETB
127 && (sec == &bfd_abs_section
128 || sec == &bfd_und_section))
130 if (flags & BSF_EXPORT)
133 switch (type & N_TYPE)
139 /* Set the debugging flag for constructor symbols so that
140 BFD leaves them alone. */
141 sym->bsym->flags |= BSF_DEBUGGING;
144 /* Put indirect symbols in the indirect section. */
145 sym->bsym->section = &bfd_ind_section;
146 sym->bsym->flags |= BSF_INDIRECT;
149 sym->bsym->flags |= BSF_EXPORT;
150 sym->bsym->flags &=~ BSF_LOCAL;
154 /* Mark warning symbols. */
155 sym->bsym->flags |= BSF_WARNING;
161 sym->bsym->flags |= BSF_DEBUGGING;
164 S_SET_TYPE (sym, type);
168 obj_aout_frob_file ()
170 /* Relocation processing may require knowing the VMAs of the sections.
171 Since writing to a section will cause the BFD back end to compute the
172 VMAs, fake it out here.... */
175 if (bfd_section_size (stdoutput, text_section) != 0)
177 x = bfd_set_section_contents (stdoutput, text_section, &b, (file_ptr) 0,
180 else if (bfd_section_size (stdoutput, data_section) != 0)
182 x = bfd_set_section_contents (stdoutput, data_section, &b, (file_ptr) 0,
195 * Crawl along a fixS chain. Emit the segment's relocations.
198 obj_emit_relocations (where, fixP, segment_address_in_file)
200 fixS *fixP; /* Fixup chain for this segment. */
201 relax_addressT segment_address_in_file;
203 for (; fixP; fixP = fixP->fx_next)
204 if (fixP->fx_done == 0)
206 tc_aout_fix_to_chars (*where, fixP, segment_address_in_file);
207 *where += md_reloc_size;
211 #ifndef obj_header_append
212 /* Aout file generation & utilities */
214 obj_header_append (where, headers)
216 object_headers *headers;
218 tc_headers_hook (headers);
221 md_number_to_chars (*where, headers->header.a_info, sizeof (headers->header.a_info));
222 *where += sizeof (headers->header.a_info);
223 md_number_to_chars (*where, headers->header.a_text, sizeof (headers->header.a_text));
224 *where += sizeof (headers->header.a_text);
225 md_number_to_chars (*where, headers->header.a_data, sizeof (headers->header.a_data));
226 *where += sizeof (headers->header.a_data);
227 md_number_to_chars (*where, headers->header.a_bss, sizeof (headers->header.a_bss));
228 *where += sizeof (headers->header.a_bss);
229 md_number_to_chars (*where, headers->header.a_syms, sizeof (headers->header.a_syms));
230 *where += sizeof (headers->header.a_syms);
231 md_number_to_chars (*where, headers->header.a_entry, sizeof (headers->header.a_entry));
232 *where += sizeof (headers->header.a_entry);
233 md_number_to_chars (*where, headers->header.a_trsize, sizeof (headers->header.a_trsize));
234 *where += sizeof (headers->header.a_trsize);
235 md_number_to_chars (*where, headers->header.a_drsize, sizeof (headers->header.a_drsize));
236 *where += sizeof (headers->header.a_drsize);
238 #else /* CROSS_COMPILE */
240 append (where, (char *) &headers->header, sizeof (headers->header));
241 #endif /* CROSS_COMPILE */
247 obj_symbol_to_chars (where, symbolP)
251 md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP)), S_GET_OFFSET (symbolP), sizeof (S_GET_OFFSET (symbolP)));
252 md_number_to_chars ((char *) &(S_GET_DESC (symbolP)), S_GET_DESC (symbolP), sizeof (S_GET_DESC (symbolP)));
253 md_number_to_chars ((char *) &(symbolP->sy_symbol.n_value), S_GET_VALUE (symbolP), sizeof (symbolP->sy_symbol.n_value));
255 append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type));
259 obj_emit_symbols (where, symbol_rootP)
261 symbolS *symbol_rootP;
265 /* Emit all symbols left in the symbol chain. */
266 for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
268 /* Used to save the offset of the name. It is used to point
269 to the string in memory but must be a file offset. */
272 temp = S_GET_NAME (symbolP);
273 S_SET_OFFSET (symbolP, symbolP->sy_name_offset);
275 /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
276 if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP))
277 S_SET_EXTERNAL (symbolP);
279 /* Adjust the type of a weak symbol. */
280 if (S_GET_WEAK (symbolP))
282 switch (S_GET_TYPE (symbolP))
284 case N_UNDF: S_SET_TYPE (symbolP, N_WEAKU); break;
285 case N_ABS: S_SET_TYPE (symbolP, N_WEAKA); break;
286 case N_TEXT: S_SET_TYPE (symbolP, N_WEAKT); break;
287 case N_DATA: S_SET_TYPE (symbolP, N_WEAKD); break;
288 case N_BSS: S_SET_TYPE (symbolP, N_WEAKB); break;
289 default: as_bad ("%s: bad type for weak symbol", temp); break;
293 obj_symbol_to_chars (where, symbolP);
294 S_SET_NAME (symbolP, temp);
298 #endif /* ! BFD_ASSEMBLER */
301 obj_aout_line (ignore)
304 /* Assume delimiter is part of expression.
305 BSD4.2 as fails with delightful bug, so we
306 are not being incompatible here. */
307 new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
308 demand_empty_rest_of_line ();
309 } /* obj_aout_line() */
311 /* Handle .weak. This is a GNU extension. */
314 obj_aout_weak (ignore)
323 name = input_line_pointer;
324 c = get_symbol_end ();
325 symbolP = symbol_find_or_make (name);
326 *input_line_pointer = c;
328 S_SET_WEAK (symbolP);
331 input_line_pointer++;
333 if (*input_line_pointer == '\n')
338 demand_empty_rest_of_line ();
342 obj_read_begin_hook ()
346 #ifndef BFD_ASSEMBLER
349 obj_crawl_symbol_chain (headers)
350 object_headers *headers;
354 int symbol_number = 0;
356 tc_crawl_symbol_chain (headers);
358 symbolPP = &symbol_rootP; /*->last symbol chain link. */
359 while ((symbolP = *symbolPP) != NULL)
361 if (flag_readonly_data_in_text && (S_GET_SEGMENT (symbolP) == SEG_DATA))
363 S_SET_SEGMENT (symbolP, SEG_TEXT);
364 } /* if pusing data into text */
366 resolve_symbol_value (symbolP);
368 /* OK, here is how we decide which symbols go out into the brave
369 new symtab. Symbols that do are:
371 * symbols with no name (stabd's?)
372 * symbols with debug info in their N_TYPE
374 Symbols that don't are:
375 * symbols that are registers
376 * symbols with \1 as their 3rd character (numeric labels)
377 * "local labels" as defined by S_LOCAL_NAME(name) if the -L
378 switch was passed to gas.
380 All other symbols are output. We complain if a deleted
381 symbol was marked external. */
384 if (!S_IS_REGISTER (symbolP)
385 && (!S_GET_NAME (symbolP)
386 || S_IS_DEBUG (symbolP)
387 || !S_IS_DEFINED (symbolP)
388 || S_IS_EXTERNAL (symbolP)
389 || (S_GET_NAME (symbolP)[0] != '\001'
390 && (flag_keep_locals || !S_LOCAL_NAME (symbolP)))))
392 symbolP->sy_number = symbol_number++;
394 /* The + 1 after strlen account for the \0 at the
395 end of each string */
396 if (!S_IS_STABD (symbolP))
399 symbolP->sy_name_offset = string_byte_count;
400 string_byte_count += strlen (S_GET_NAME (symbolP)) + 1;
402 else /* .Stabd case. */
403 symbolP->sy_name_offset = 0;
404 symbolPP = &(symbol_next (symbolP));
408 if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP))
409 /* This warning should never get triggered any more.
410 Well, maybe if you're doing twisted things with
413 as_bad ("Local symbol %s never defined.", decode_local_label_name (S_GET_NAME (symbolP)));
416 /* Unhook it from the chain */
417 *symbolPP = symbol_next (symbolP);
418 } /* if this symbol should be in the output */
419 } /* for each symbol */
421 H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number);
425 * Find strings by crawling along symbol table chain.
429 obj_emit_strings (where)
435 /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
436 md_number_to_chars (*where, string_byte_count, sizeof (string_byte_count));
437 *where += sizeof (string_byte_count);
438 #else /* CROSS_COMPILE */
439 append (where, (char *) &string_byte_count, (unsigned long) sizeof (string_byte_count));
440 #endif /* CROSS_COMPILE */
442 for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
444 if (S_GET_NAME (symbolP))
445 append (&next_object_file_charP, S_GET_NAME (symbolP),
446 (unsigned long) (strlen (S_GET_NAME (symbolP)) + 1));
447 } /* walk symbol chain */
451 #define AOUT_VERSION 0
455 obj_pre_write_hook (headers)
456 object_headers *headers;
458 H_SET_DYNAMIC (headers, 0);
459 H_SET_VERSION (headers, AOUT_VERSION);
460 H_SET_MACHTYPE (headers, AOUT_MACHTYPE);
461 tc_aout_pre_write_hook (headers);
467 /* Strip out the section name */
469 char *section_name_end;
476 section_name = input_line_pointer;
477 c = get_symbol_end ();
478 section_name_end = input_line_pointer;
480 len = section_name_end - section_name;
481 input_line_pointer++;
482 save = input_line_pointer;
487 exp = get_absolute_expression ();
489 else if (*input_line_pointer == ',')
491 input_line_pointer++;
492 exp = get_absolute_expression ();
496 input_line_pointer = save;
501 as_bad ("subsegment index too high");
504 if (strcmp (section_name, ".text") == 0)
506 subseg_set (SEG_TEXT, (subsegT) exp);
509 if (strcmp (section_name, ".data") == 0)
511 if (flag_readonly_data_in_text)
512 subseg_set (SEG_TEXT, (subsegT) exp + 1000);
514 subseg_set (SEG_DATA, (subsegT) exp);
517 *section_name_end = c;
520 #endif /* ! BFD_ASSEMBLER */
522 /* end of obj-aout.c */