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));
66 const pseudo_typeS obj_pseudo_table[] =
68 {"line", obj_aout_line, 0}, /* source code line number */
69 {"ln", obj_aout_line, 0}, /* coff line number that we use anyway */
71 /* coff debug pseudos (ignored) */
74 {"endef", s_ignore, 0},
75 {"ident", s_ignore, 0},
76 {"line", s_ignore, 0},
79 {"size", s_ignore, 0},
81 {"type", s_ignore, 0},
83 {"version", s_ignore, 0},
85 {"optim", s_ignore, 0}, /* For sun386i cc (?) */
88 {"ABORT", s_abort, 0},
90 {NULL} /* end sentinel */
91 }; /* obj_pseudo_table */
97 obj_aout_frob_symbol (sym, punt)
103 int desc, type, other;
105 flags = sym->bsym->flags;
106 desc = S_GET_DESC (sym);
107 type = S_GET_TYPE (sym);
108 other = S_GET_OTHER (sym);
109 sec = sym->bsym->section;
111 /* Only frob simple symbols this way right now. */
112 if (! (type & ~ (N_TYPE | N_EXT)))
114 if (type == (N_UNDF | N_EXT)
115 && sec == &bfd_abs_section)
116 sym->bsym->section = sec = &bfd_und_section;
118 if ((type & N_TYPE) != N_INDR
120 && (sec == &bfd_abs_section
121 || sec == &bfd_und_section))
123 if (flags & BSF_EXPORT)
126 switch (type & N_TYPE)
132 /* Set the debugging flag for constructor symbols so that
133 BFD leaves them alone. */
134 sym->bsym->flags |= BSF_DEBUGGING;
137 /* Put indirect symbols in the indirect section. */
138 sym->bsym->section = &bfd_ind_section;
139 sym->bsym->flags |= BSF_INDIRECT;
142 sym->bsym->flags |= BSF_EXPORT;
143 sym->bsym->flags &=~ BSF_LOCAL;
147 /* Mark warning symbols. */
148 sym->bsym->flags |= BSF_WARNING;
154 sym->bsym->flags |= BSF_DEBUGGING;
157 S_SET_TYPE (sym, type);
161 obj_aout_frob_file ()
163 /* Relocation processing may require knowing the VMAs of the sections.
164 Since writing to a section will cause the BFD back end to compute the
165 VMAs, fake it out here.... */
168 if (bfd_section_size (stdoutput, text_section) != 0)
170 x = bfd_set_section_contents (stdoutput, text_section, &b, (file_ptr) 0,
173 else if (bfd_section_size (stdoutput, data_section) != 0)
175 x = bfd_set_section_contents (stdoutput, data_section, &b, (file_ptr) 0,
188 * Crawl along a fixS chain. Emit the segment's relocations.
191 obj_emit_relocations (where, fixP, segment_address_in_file)
193 fixS *fixP; /* Fixup chain for this segment. */
194 relax_addressT segment_address_in_file;
196 for (; fixP; fixP = fixP->fx_next)
197 if (fixP->fx_done == 0)
199 tc_aout_fix_to_chars (*where, fixP, segment_address_in_file);
200 *where += md_reloc_size;
204 #ifndef obj_header_append
205 /* Aout file generation & utilities */
207 obj_header_append (where, headers)
209 object_headers *headers;
211 tc_headers_hook (headers);
214 md_number_to_chars (*where, headers->header.a_info, sizeof (headers->header.a_info));
215 *where += sizeof (headers->header.a_info);
216 md_number_to_chars (*where, headers->header.a_text, sizeof (headers->header.a_text));
217 *where += sizeof (headers->header.a_text);
218 md_number_to_chars (*where, headers->header.a_data, sizeof (headers->header.a_data));
219 *where += sizeof (headers->header.a_data);
220 md_number_to_chars (*where, headers->header.a_bss, sizeof (headers->header.a_bss));
221 *where += sizeof (headers->header.a_bss);
222 md_number_to_chars (*where, headers->header.a_syms, sizeof (headers->header.a_syms));
223 *where += sizeof (headers->header.a_syms);
224 md_number_to_chars (*where, headers->header.a_entry, sizeof (headers->header.a_entry));
225 *where += sizeof (headers->header.a_entry);
226 md_number_to_chars (*where, headers->header.a_trsize, sizeof (headers->header.a_trsize));
227 *where += sizeof (headers->header.a_trsize);
228 md_number_to_chars (*where, headers->header.a_drsize, sizeof (headers->header.a_drsize));
229 *where += sizeof (headers->header.a_drsize);
231 #else /* CROSS_COMPILE */
233 append (where, (char *) &headers->header, sizeof (headers->header));
234 #endif /* CROSS_COMPILE */
240 obj_symbol_to_chars (where, symbolP)
244 md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP)), S_GET_OFFSET (symbolP), sizeof (S_GET_OFFSET (symbolP)));
245 md_number_to_chars ((char *) &(S_GET_DESC (symbolP)), S_GET_DESC (symbolP), sizeof (S_GET_DESC (symbolP)));
246 md_number_to_chars ((char *) &(symbolP->sy_symbol.n_value), S_GET_VALUE (symbolP), sizeof (symbolP->sy_symbol.n_value));
248 append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type));
252 obj_emit_symbols (where, symbol_rootP)
254 symbolS *symbol_rootP;
258 /* Emit all symbols left in the symbol chain. */
259 for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
261 /* Used to save the offset of the name. It is used to point
262 to the string in memory but must be a file offset. */
265 temp = S_GET_NAME (symbolP);
266 S_SET_OFFSET (symbolP, symbolP->sy_name_offset);
268 /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
269 if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP))
270 S_SET_EXTERNAL (symbolP);
272 obj_symbol_to_chars (where, symbolP);
273 S_SET_NAME (symbolP, temp);
277 #endif /* ! BFD_ASSEMBLER */
280 obj_aout_line (ignore)
283 /* Assume delimiter is part of expression.
284 BSD4.2 as fails with delightful bug, so we
285 are not being incompatible here. */
286 new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
287 demand_empty_rest_of_line ();
288 } /* obj_aout_line() */
291 obj_read_begin_hook ()
295 #ifndef BFD_ASSEMBLER
298 obj_crawl_symbol_chain (headers)
299 object_headers *headers;
303 int symbol_number = 0;
305 tc_crawl_symbol_chain (headers);
307 symbolPP = &symbol_rootP; /*->last symbol chain link. */
308 while ((symbolP = *symbolPP) != NULL)
310 if (flagseen['R'] && (S_GET_SEGMENT (symbolP) == SEG_DATA))
312 S_SET_SEGMENT (symbolP, SEG_TEXT);
313 } /* if pusing data into text */
315 resolve_symbol_value (symbolP);
317 /* OK, here is how we decide which symbols go out into the brave
318 new symtab. Symbols that do are:
320 * symbols with no name (stabd's?)
321 * symbols with debug info in their N_TYPE
323 Symbols that don't are:
324 * symbols that are registers
325 * symbols with \1 as their 3rd character (numeric labels)
326 * "local labels" as defined by S_LOCAL_NAME(name) if the -L
327 switch was passed to gas.
329 All other symbols are output. We complain if a deleted
330 symbol was marked external. */
333 if (!S_IS_REGISTER (symbolP)
334 && (!S_GET_NAME (symbolP)
335 || S_IS_DEBUG (symbolP)
336 || !S_IS_DEFINED (symbolP)
337 || S_IS_EXTERNAL (symbolP)
338 || (S_GET_NAME (symbolP)[0] != '\001'
339 && (flagseen['L'] || !S_LOCAL_NAME (symbolP)))))
341 symbolP->sy_number = symbol_number++;
343 /* The + 1 after strlen account for the \0 at the
344 end of each string */
345 if (!S_IS_STABD (symbolP))
348 symbolP->sy_name_offset = string_byte_count;
349 string_byte_count += strlen (S_GET_NAME (symbolP)) + 1;
351 else /* .Stabd case. */
352 symbolP->sy_name_offset = 0;
353 symbolPP = &(symbol_next (symbolP));
357 if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP))
358 /* This warning should never get triggered any more.
359 Well, maybe if you're doing twisted things with
362 as_bad ("Local symbol %s never defined.", decode_local_label_name (S_GET_NAME (symbolP)));
365 /* Unhook it from the chain */
366 *symbolPP = symbol_next (symbolP);
367 } /* if this symbol should be in the output */
368 } /* for each symbol */
370 H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number);
374 * Find strings by crawling along symbol table chain.
378 obj_emit_strings (where)
384 /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
385 md_number_to_chars (*where, string_byte_count, sizeof (string_byte_count));
386 *where += sizeof (string_byte_count);
387 #else /* CROSS_COMPILE */
388 append (where, (char *) &string_byte_count, (unsigned long) sizeof (string_byte_count));
389 #endif /* CROSS_COMPILE */
391 for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
393 if (S_GET_NAME (symbolP))
394 append (&next_object_file_charP, S_GET_NAME (symbolP),
395 (unsigned long) (strlen (S_GET_NAME (symbolP)) + 1));
396 } /* walk symbol chain */
400 #define AOUT_VERSION 0
404 obj_pre_write_hook (headers)
405 object_headers *headers;
407 H_SET_DYNAMIC (headers, 0);
408 H_SET_VERSION (headers, AOUT_VERSION);
409 H_SET_MACHTYPE (headers, AOUT_MACHTYPE);
410 tc_aout_pre_write_hook (headers);
416 /* Strip out the section name */
418 char *section_name_end;
425 section_name = input_line_pointer;
426 c = get_symbol_end ();
427 section_name_end = input_line_pointer;
429 len = section_name_end - section_name;
430 input_line_pointer++;
431 save = input_line_pointer;
436 exp = get_absolute_expression ();
438 else if (*input_line_pointer == ',')
440 input_line_pointer++;
441 exp = get_absolute_expression ();
445 input_line_pointer = save;
450 as_bad ("subsegment index too high");
453 if (strcmp (section_name, ".text") == 0)
455 subseg_set (SEG_TEXT, (subsegT) exp);
458 if (strcmp (section_name, ".data") == 0)
461 subseg_set (SEG_TEXT, (subsegT) exp + 1000);
463 subseg_set (SEG_DATA, (subsegT) exp);
466 *section_name_end = c;
469 #endif /* ! BFD_ASSEMBLER */
471 /* end of obj-aout.c */