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
119 && (sec == &bfd_abs_section
120 || sec == &bfd_und_section))
122 if (flags & BSF_EXPORT)
125 switch (type & N_TYPE)
131 /* Set the debugging flag for constructor symbols so that
132 BFD leaves them alone. */
133 sym->bsym->flags |= BSF_DEBUGGING;
136 /* Put indirect symbols in the indirect section. */
137 sym->bsym->section = &bfd_ind_section;
138 sym->bsym->flags |= BSF_INDIRECT;
141 /* Mark warning symbols. */
142 sym->bsym->flags |= BSF_WARNING;
148 sym->bsym->flags |= BSF_DEBUGGING;
151 S_SET_TYPE (sym, type);
161 * Crawl along a fixS chain. Emit the segment's relocations.
164 obj_emit_relocations (where, fixP, segment_address_in_file)
166 fixS *fixP; /* Fixup chain for this segment. */
167 relax_addressT segment_address_in_file;
169 for (; fixP; fixP = fixP->fx_next)
170 if (fixP->fx_addsy != NULL)
172 tc_aout_fix_to_chars (*where, fixP, segment_address_in_file);
173 *where += md_reloc_size;
177 #ifndef obj_header_append
178 /* Aout file generation & utilities */
180 obj_header_append (where, headers)
182 object_headers *headers;
184 tc_headers_hook (headers);
187 md_number_to_chars (*where, headers->header.a_info, sizeof (headers->header.a_info));
188 *where += sizeof (headers->header.a_info);
189 md_number_to_chars (*where, headers->header.a_text, sizeof (headers->header.a_text));
190 *where += sizeof (headers->header.a_text);
191 md_number_to_chars (*where, headers->header.a_data, sizeof (headers->header.a_data));
192 *where += sizeof (headers->header.a_data);
193 md_number_to_chars (*where, headers->header.a_bss, sizeof (headers->header.a_bss));
194 *where += sizeof (headers->header.a_bss);
195 md_number_to_chars (*where, headers->header.a_syms, sizeof (headers->header.a_syms));
196 *where += sizeof (headers->header.a_syms);
197 md_number_to_chars (*where, headers->header.a_entry, sizeof (headers->header.a_entry));
198 *where += sizeof (headers->header.a_entry);
199 md_number_to_chars (*where, headers->header.a_trsize, sizeof (headers->header.a_trsize));
200 *where += sizeof (headers->header.a_trsize);
201 md_number_to_chars (*where, headers->header.a_drsize, sizeof (headers->header.a_drsize));
202 *where += sizeof (headers->header.a_drsize);
204 #else /* CROSS_COMPILE */
206 append (where, (char *) &headers->header, sizeof (headers->header));
207 #endif /* CROSS_COMPILE */
213 obj_symbol_to_chars (where, symbolP)
217 md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP)), S_GET_OFFSET (symbolP), sizeof (S_GET_OFFSET (symbolP)));
218 md_number_to_chars ((char *) &(S_GET_DESC (symbolP)), S_GET_DESC (symbolP), sizeof (S_GET_DESC (symbolP)));
219 md_number_to_chars ((char *) &(symbolP->sy_symbol.n_value), S_GET_VALUE (symbolP), sizeof (symbolP->sy_symbol.n_value));
221 append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type));
225 obj_emit_symbols (where, symbol_rootP)
227 symbolS *symbol_rootP;
231 /* Emit all symbols left in the symbol chain. */
232 for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
234 /* Used to save the offset of the name. It is used to point
235 to the string in memory but must be a file offset. */
238 temp = S_GET_NAME (symbolP);
239 S_SET_OFFSET (symbolP, symbolP->sy_name_offset);
241 /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
242 if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP))
243 S_SET_EXTERNAL (symbolP);
245 obj_symbol_to_chars (where, symbolP);
246 S_SET_NAME (symbolP, temp);
250 #endif /* ! BFD_ASSEMBLER */
253 obj_aout_line (ignore)
256 /* Assume delimiter is part of expression.
257 BSD4.2 as fails with delightful bug, so we
258 are not being incompatible here. */
259 new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
260 demand_empty_rest_of_line ();
261 } /* obj_aout_line() */
264 obj_read_begin_hook ()
268 #ifndef BFD_ASSEMBLER
271 obj_crawl_symbol_chain (headers)
272 object_headers *headers;
276 int symbol_number = 0;
278 tc_crawl_symbol_chain (headers);
280 symbolPP = &symbol_rootP; /*->last symbol chain link. */
281 while ((symbolP = *symbolPP) != NULL)
283 if (flagseen['R'] && (S_GET_SEGMENT (symbolP) == SEG_DATA))
285 S_SET_SEGMENT (symbolP, SEG_TEXT);
286 } /* if pusing data into text */
288 resolve_symbol_value (symbolP);
290 /* OK, here is how we decide which symbols go out into the brave
291 new symtab. Symbols that do are:
293 * symbols with no name (stabd's?)
294 * symbols with debug info in their N_TYPE
296 Symbols that don't are:
297 * symbols that are registers
298 * symbols with \1 as their 3rd character (numeric labels)
299 * "local labels" as defined by S_LOCAL_NAME(name) if the -L
300 switch was passed to gas.
302 All other symbols are output. We complain if a deleted
303 symbol was marked external. */
306 if (!S_IS_REGISTER (symbolP)
307 && (!S_GET_NAME (symbolP)
308 || S_IS_DEBUG (symbolP)
310 /* FIXME-SOON this ifdef seems highly dubious to me. xoxorich. */
311 || !S_IS_DEFINED (symbolP)
312 || S_IS_EXTERNAL (symbolP)
314 || (S_GET_NAME (symbolP)[0] != '\001' && (flagseen['L'] || !S_LOCAL_NAME (symbolP)))))
316 symbolP->sy_number = symbol_number++;
318 /* The + 1 after strlen account for the \0 at the
319 end of each string */
320 if (!S_IS_STABD (symbolP))
323 symbolP->sy_name_offset = string_byte_count;
324 string_byte_count += strlen (S_GET_NAME (symbolP)) + 1;
326 else /* .Stabd case. */
327 symbolP->sy_name_offset = 0;
328 symbolPP = &(symbol_next (symbolP));
332 if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP))
334 as_bad ("Local symbol %s never defined.", decode_local_label_name (S_GET_NAME (symbolP)));
337 /* Unhook it from the chain */
338 *symbolPP = symbol_next (symbolP);
339 } /* if this symbol should be in the output */
340 } /* for each symbol */
342 H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number);
346 * Find strings by crawling along symbol table chain.
350 obj_emit_strings (where)
356 /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
357 md_number_to_chars (*where, string_byte_count, sizeof (string_byte_count));
358 *where += sizeof (string_byte_count);
359 #else /* CROSS_COMPILE */
360 append (where, (char *) &string_byte_count, (unsigned long) sizeof (string_byte_count));
361 #endif /* CROSS_COMPILE */
363 for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
365 if (S_GET_NAME (symbolP))
366 append (&next_object_file_charP, S_GET_NAME (symbolP),
367 (unsigned long) (strlen (S_GET_NAME (symbolP)) + 1));
368 } /* walk symbol chain */
372 #define AOUT_VERSION 0
376 obj_pre_write_hook (headers)
377 object_headers *headers;
379 H_SET_DYNAMIC (headers, 0);
380 H_SET_VERSION (headers, AOUT_VERSION);
381 H_SET_MACHTYPE (headers, AOUT_MACHTYPE);
382 tc_aout_pre_write_hook (headers);
388 /* Strip out the section name */
390 char *section_name_end;
397 section_name = input_line_pointer;
398 c = get_symbol_end ();
399 section_name_end = input_line_pointer;
401 len = section_name_end - section_name;
402 input_line_pointer++;
403 save = input_line_pointer;
408 exp = get_absolute_expression ();
410 else if (*input_line_pointer == ',')
412 input_line_pointer++;
413 exp = get_absolute_expression ();
417 input_line_pointer = save;
422 as_bad ("subsegment index too high");
425 if (strcmp (section_name, ".text") == 0)
427 subseg_set (SEG_TEXT, (subsegT) exp);
430 if (strcmp (section_name, ".data") == 0)
433 subseg_set (SEG_TEXT, (subsegT) exp + 1000);
435 subseg_set (SEG_DATA, (subsegT) exp);
438 *section_name_end = c;
441 #endif /* ! BFD_ASSEMBLER */
443 /* end of obj-aout.c */