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fecd2382 RP |
1 | /* a.out object file format |
2 | Copyright (C) 1989, 1990, 1991 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GAS, the GNU Assembler. | |
5 | ||
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 1, | |
9 | or (at your option) any later version. | |
10 | ||
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. | |
15 | ||
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. */ | |
19 | ||
20 | /* $Id$ */ | |
21 | ||
22 | #include "as.h" | |
23 | ||
24 | #include "obstack.h" | |
25 | ||
26 | /* in: segT out: N_TYPE bits */ | |
27 | const short seg_N_TYPE[] = { | |
28 | N_ABS, | |
29 | N_TEXT, | |
30 | N_DATA, | |
31 | N_BSS, | |
32 | N_UNDF, /* unknown */ | |
33 | N_UNDF, /* absent */ | |
34 | N_UNDF, /* pass1 */ | |
35 | N_UNDF, /* error */ | |
36 | N_UNDF, /* bignum/flonum */ | |
37 | N_UNDF, /* difference */ | |
38 | N_UNDF, /* debug */ | |
39 | N_UNDF, /* ntv */ | |
40 | N_UNDF, /* ptv */ | |
41 | N_REGISTER, /* register */ | |
42 | }; | |
43 | ||
44 | const segT N_TYPE_seg [N_TYPE+2] = { /* N_TYPE == 0x1E = 32-2 */ | |
45 | SEG_UNKNOWN, /* N_UNDF == 0 */ | |
46 | SEG_GOOF, | |
47 | SEG_ABSOLUTE, /* N_ABS == 2 */ | |
48 | SEG_GOOF, | |
49 | SEG_TEXT, /* N_TEXT == 4 */ | |
50 | SEG_GOOF, | |
51 | SEG_DATA, /* N_DATA == 6 */ | |
52 | SEG_GOOF, | |
53 | SEG_BSS, /* N_BSS == 8 */ | |
54 | SEG_GOOF, | |
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 */ | |
59 | SEG_GOOF, | |
60 | }; | |
61 | ||
62 | #ifdef __STDC__ | |
63 | static void obj_aout_stab(int what); | |
64 | static void obj_aout_line(void); | |
65 | static void obj_aout_desc(void); | |
66 | #else /* __STDC__ */ | |
67 | static void obj_aout_desc(); | |
68 | static void obj_aout_stab(); | |
69 | static void obj_aout_line(); | |
70 | #endif /* __STDC__ */ | |
71 | ||
72 | const pseudo_typeS obj_pseudo_table[] = { | |
73 | { "line", obj_aout_line, 0 }, /* source code line number */ | |
74 | { "ln", obj_aout_line, 0 }, /* source code line number */ | |
75 | { "desc", obj_aout_desc, 0 }, /* def */ | |
76 | { "stabd", obj_aout_stab, 'd' }, /* stabs */ | |
77 | { "stabn", obj_aout_stab, 'n' }, /* stabs */ | |
78 | { "stabs", obj_aout_stab, 's' }, /* stabs */ | |
79 | ||
80 | { NULL} /* end sentinel */ | |
81 | }; /* obj_pseudo_table */ | |
82 | ||
83 | ||
84 | /* Relocation. */ | |
85 | ||
86 | /* | |
87 | * In: length of relocation (or of address) in chars: 1, 2 or 4. | |
88 | * Out: GNU LD relocation length code: 0, 1, or 2. | |
89 | */ | |
90 | ||
91 | static unsigned char | |
92 | nbytes_r_length [] = { | |
93 | 42, 0, 1, 42, 2 | |
94 | }; | |
95 | ||
96 | /* | |
97 | * emit_relocations() | |
98 | * | |
99 | * Crawl along a fixS chain. Emit the segment's relocations. | |
100 | */ | |
101 | void obj_emit_relocations(where, fixP, segment_address_in_file) | |
102 | char **where; | |
103 | fixS *fixP; /* Fixup chain for this segment. */ | |
104 | relax_addressT segment_address_in_file; | |
105 | { | |
106 | struct reloc_info_generic ri; | |
107 | register symbolS *symbolP; | |
108 | ||
109 | /* If a machine dependent emitter is needed, call it instead. */ | |
110 | if (md_emit_relocations) { | |
111 | (*md_emit_relocations) (fixP, segment_address_in_file); | |
112 | return; | |
113 | } | |
114 | ||
115 | /* JF this is for paranoia */ | |
116 | bzero((char *)&ri,sizeof(ri)); | |
117 | for (; fixP; fixP = fixP->fx_next) { | |
118 | if ((symbolP = fixP->fx_addsy) != 0) { | |
119 | ri.r_bsr = fixP->fx_bsr; | |
120 | ri.r_disp = fixP->fx_im_disp; | |
121 | ri.r_callj = fixP->fx_callj; | |
122 | ri.r_length = nbytes_r_length [fixP->fx_size]; | |
123 | ri.r_pcrel = fixP->fx_pcrel; | |
124 | ri.r_address = fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file; | |
125 | ||
126 | if (S_GET_TYPE(symbolP) == N_UNDF) { | |
127 | ri.r_extern = 1; | |
128 | ri.r_symbolnum = symbolP->sy_number; | |
129 | } else { | |
130 | ri.r_extern = 0; | |
131 | ri.r_symbolnum = S_GET_TYPE(symbolP); | |
132 | } | |
133 | ||
134 | /* Output the relocation information in machine-dependent form. */ | |
135 | md_ri_to_chars(*where, &ri); | |
136 | *where += md_reloc_size; | |
137 | } /* if there is an add symbol */ | |
138 | } /* for each fix */ | |
139 | ||
140 | return; | |
141 | } /* emit_relocations() */ | |
142 | ||
143 | /* Aout file generation & utilities */ | |
144 | void obj_header_append(where, headers) | |
145 | char **where; | |
146 | object_headers *headers; | |
147 | { | |
148 | tc_headers_hook(headers); | |
149 | ||
150 | #ifdef CROSS_ASSEMBLE | |
151 | md_number_to_chars(*where, headers->header.a_info, sizeof(headers->header.a_info)); | |
152 | *where += sizeof(headers->header.a_info); | |
153 | md_number_to_chars(*where, headers->header.a_text, sizeof(headers->header.a_text)); | |
154 | *where += sizeof(headers->header.a_text); | |
155 | md_number_to_chars(*where, headers->header.a_data, sizeof(headers->header.a_data)); | |
156 | *where += sizeof(headers->header.a_data); | |
157 | md_number_to_chars(*where, headers->header.a_bss, sizeof(headers->header.a_bss)); | |
158 | *where += sizeof(headers->header.a_bss); | |
159 | md_number_to_chars(*where, headers->header.a_syms, sizeof(headers->header.a_syms)); | |
160 | *where += sizeof(headers->header.a_syms); | |
161 | md_number_to_chars(*where, headers->header.a_entry, sizeof(headers->header.a_entry)); | |
162 | *where += sizeof(headers->header.a_entry); | |
163 | md_number_to_chars(*where, headers->header.a_trsize, sizeof(headers->header.a_trsize)); | |
164 | *where += sizeof(headers->header.a_trsize); | |
165 | md_number_to_chars(*where, headers->header.a_drsize, sizeof(headers->header.a_drsize)); | |
166 | *where += sizeof(headers->header.a_drsize); | |
167 | #ifdef EXEC_MACHINE_TYPE | |
168 | md_number_to_chars(*where, headers->header.a_machtype, sizeof(headers->header.a_machtype)); | |
169 | *where += sizeof(headers->header.a_machtype); | |
170 | #endif /* EXEC_MACHINE_TYPE */ | |
171 | #ifdef EXEC_VERSION | |
172 | md_number_to_chars(*where, headers->header.a_version, sizeof(headers->header.a_version)); | |
173 | *where += sizeof(headers->header.a_version); | |
174 | #endif /* EXEC_VERSION */ | |
175 | ||
176 | #else /* CROSS_ASSEMBLE */ | |
177 | ||
178 | append(where, (char *) &headers->header, sizeof(headers->header)); | |
179 | #endif /* CROSS_ASSEMBLE */ | |
180 | ||
181 | return; | |
182 | } /* obj_append_header() */ | |
183 | ||
184 | void obj_symbol_to_chars(where, symbolP) | |
185 | char **where; | |
186 | symbolS *symbolP; | |
187 | { | |
188 | md_number_to_chars((char *)&(S_GET_OFFSET(symbolP)), S_GET_OFFSET(symbolP), sizeof(S_GET_OFFSET(symbolP))); | |
189 | md_number_to_chars((char *)&(S_GET_DESC(symbolP)), S_GET_DESC(symbolP), sizeof(S_GET_DESC(symbolP))); | |
190 | md_number_to_chars((char *)&(S_GET_VALUE(symbolP)), S_GET_VALUE(symbolP), sizeof(S_GET_VALUE(symbolP))); | |
191 | ||
192 | append(where, (char *)&symbolP->sy_symbol, sizeof(obj_symbol_type)); | |
193 | } /* obj_symbol_to_chars() */ | |
194 | ||
195 | void obj_emit_symbols(where, symbol_rootP) | |
196 | char **where; | |
197 | symbolS *symbol_rootP; | |
198 | { | |
199 | symbolS * symbolP; | |
200 | ||
201 | /* | |
202 | * Emit all symbols left in the symbol chain. | |
203 | */ | |
204 | for(symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) { | |
205 | /* Used to save the offset of the name. It is used to point | |
206 | to the string in memory but must be a file offset. */ | |
207 | register char *temp; | |
208 | ||
209 | temp = S_GET_NAME(symbolP); | |
210 | S_SET_OFFSET(symbolP, symbolP->sy_name_offset); | |
211 | ||
212 | /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */ | |
213 | if (!S_IS_DEBUG(symbolP) && !S_IS_DEFINED(symbolP)) S_SET_EXTERNAL(symbolP); | |
214 | ||
215 | obj_symbol_to_chars(where, symbolP); | |
216 | S_SET_NAME(symbolP,temp); | |
217 | } | |
218 | } /* emit_symbols() */ | |
219 | ||
220 | void obj_symbol_new_hook(symbolP) | |
221 | symbolS *symbolP; | |
222 | { | |
223 | S_SET_OTHER(symbolP, 0); | |
224 | S_SET_DESC(symbolP, 0); | |
225 | return; | |
226 | } /* obj_symbol_new_hook() */ | |
227 | ||
228 | static void obj_aout_line() { | |
229 | /* Assume delimiter is part of expression. */ | |
230 | /* BSD4.2 as fails with delightful bug, so we */ | |
231 | /* are not being incompatible here. */ | |
232 | new_logical_line((char *)NULL, (int)(get_absolute_expression())); | |
233 | demand_empty_rest_of_line(); | |
234 | } /* obj_aout_line() */ | |
235 | ||
236 | /* | |
237 | * stab() | |
238 | * | |
239 | * Handle .stabX directives, which used to be open-coded. | |
240 | * So much creeping featurism overloaded the semantics that we decided | |
241 | * to put all .stabX thinking in one place. Here. | |
242 | * | |
243 | * We try to make any .stabX directive legal. Other people's AS will often | |
244 | * do assembly-time consistency checks: eg assigning meaning to n_type bits | |
245 | * and "protecting" you from setting them to certain values. (They also zero | |
246 | * certain bits before emitting symbols. Tut tut.) | |
247 | * | |
248 | * If an expression is not absolute we either gripe or use the relocation | |
249 | * information. Other people's assemblers silently forget information they | |
250 | * don't need and invent information they need that you didn't supply. | |
251 | * | |
252 | * .stabX directives always make a symbol table entry. It may be junk if | |
253 | * the rest of your .stabX directive is malformed. | |
254 | */ | |
255 | static void obj_aout_stab(what) | |
256 | int what; | |
257 | { | |
258 | register symbolS * symbolP = 0; | |
259 | register char * string; | |
260 | int saved_type = 0; | |
261 | int length; | |
262 | int goof; /* TRUE if we have aborted. */ | |
263 | long longint; | |
264 | ||
265 | /* | |
266 | * Enter with input_line_pointer pointing past .stabX and any following | |
267 | * whitespace. | |
268 | */ | |
269 | goof = 0; /* JF who forgot this?? */ | |
270 | if (what == 's') { | |
271 | string = demand_copy_C_string(& length); | |
272 | SKIP_WHITESPACE(); | |
273 | if (* input_line_pointer == ',') | |
274 | input_line_pointer ++; | |
275 | else { | |
276 | as_bad("I need a comma after symbol's name"); | |
277 | goof = 1; | |
278 | } | |
279 | } else | |
280 | string = ""; | |
281 | ||
282 | /* | |
283 | * Input_line_pointer->after ','. String->symbol name. | |
284 | */ | |
285 | if (! goof) { | |
286 | symbolP = symbol_new(string, | |
287 | SEG_UNKNOWN, | |
288 | 0, | |
289 | (struct frag *)0); | |
290 | switch (what) { | |
291 | case 'd': | |
292 | S_SET_NAME(symbolP, NULL); /* .stabd feature. */ | |
293 | S_SET_VALUE(symbolP, obstack_next_free(&frags) - frag_now->fr_literal); | |
294 | symbolP->sy_frag = frag_now; | |
295 | break; | |
296 | ||
297 | case 'n': | |
298 | symbolP->sy_frag = &zero_address_frag; | |
299 | break; | |
300 | ||
301 | case 's': | |
302 | symbolP->sy_frag = & zero_address_frag; | |
303 | break; | |
304 | ||
305 | default: | |
306 | BAD_CASE(what); | |
307 | break; | |
308 | } | |
309 | ||
310 | if (get_absolute_expression_and_terminator(&longint) == ',') | |
311 | symbolP->sy_symbol.n_type = saved_type = longint; | |
312 | else { | |
313 | as_bad("I want a comma after the n_type expression"); | |
314 | goof = 1; | |
315 | input_line_pointer --; /* Backup over a non-',' char. */ | |
316 | } | |
317 | } | |
318 | ||
319 | if (!goof) { | |
320 | if (get_absolute_expression_and_terminator(&longint) == ',') | |
321 | S_SET_OTHER(symbolP, longint); | |
322 | else { | |
323 | as_bad("I want a comma after the n_other expression"); | |
324 | goof = 1; | |
325 | input_line_pointer--; /* Backup over a non-',' char. */ | |
326 | } | |
327 | } | |
328 | ||
329 | if (!goof) { | |
330 | S_SET_DESC(symbolP, get_absolute_expression()); | |
331 | if (what == 's' || what == 'n') { | |
332 | if (*input_line_pointer != ',') { | |
333 | as_bad("I want a comma after the n_desc expression"); | |
334 | goof = 1; | |
335 | } else { | |
336 | input_line_pointer++; | |
337 | } | |
338 | } | |
339 | } | |
340 | ||
341 | if ((!goof) && (what=='s' || what=='n')) { | |
342 | pseudo_set(symbolP); | |
343 | symbolP->sy_symbol.n_type = saved_type; | |
344 | } | |
345 | ||
346 | if (goof) | |
347 | ignore_rest_of_line(); | |
348 | else | |
349 | demand_empty_rest_of_line (); | |
350 | } /* obj_aout_stab() */ | |
351 | ||
352 | static void obj_aout_desc() { | |
353 | register char *name; | |
354 | register char c; | |
355 | register char *p; | |
356 | register symbolS *symbolP; | |
357 | register int temp; | |
358 | ||
359 | /* | |
360 | * Frob invented at RMS' request. Set the n_desc of a symbol. | |
361 | */ | |
362 | name = input_line_pointer; | |
363 | c = get_symbol_end(); | |
364 | p = input_line_pointer; | |
365 | * p = c; | |
366 | SKIP_WHITESPACE(); | |
367 | if (*input_line_pointer != ',') { | |
368 | *p = 0; | |
369 | as_bad("Expected comma after name \"%s\"", name); | |
370 | *p = c; | |
371 | ignore_rest_of_line(); | |
372 | } else { | |
373 | input_line_pointer ++; | |
374 | temp = get_absolute_expression(); | |
375 | *p = 0; | |
376 | symbolP = symbol_find_or_make(name); | |
377 | *p = c; | |
378 | S_SET_DESC(symbolP,temp); | |
379 | } | |
380 | demand_empty_rest_of_line(); | |
381 | } /* obj_aout_desc() */ | |
382 | ||
383 | void obj_read_begin_hook() { | |
384 | return; | |
385 | } /* obj_read_begin_hook() */ | |
386 | ||
387 | void obj_crawl_symbol_chain(headers) | |
388 | object_headers *headers; | |
389 | { | |
390 | symbolS *symbolP; | |
391 | symbolS **symbolPP; | |
392 | int symbol_number = 0; | |
393 | ||
394 | /* JF deal with forward references first... */ | |
395 | for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) { | |
396 | if (symbolP->sy_forward) { | |
397 | S_SET_VALUE(symbolP, S_GET_VALUE(symbolP) | |
398 | + S_GET_VALUE(symbolP->sy_forward) | |
399 | + symbolP->sy_forward->sy_frag->fr_address); | |
400 | ||
401 | symbolP->sy_forward=0; | |
402 | } /* if it has a forward reference */ | |
403 | } /* walk the symbol chain */ | |
404 | ||
405 | tc_crawl_symbol_chain(headers); | |
406 | ||
407 | symbolPP = &symbol_rootP; /*->last symbol chain link. */ | |
408 | while ((symbolP = *symbolPP) != NULL) { | |
409 | if (flagseen['R'] && (S_GET_SEGMENT(symbolP) == SEG_DATA)) { | |
410 | S_SET_SEGMENT(symbolP, SEG_TEXT); | |
411 | } /* if pusing data into text */ | |
412 | ||
413 | S_SET_VALUE(symbolP, S_GET_VALUE(symbolP) + symbolP->sy_frag->fr_address); | |
414 | ||
415 | /* OK, here is how we decide which symbols go out into the | |
416 | brave new symtab. Symbols that do are: | |
417 | ||
418 | * symbols with no name (stabd's?) | |
419 | * symbols with debug info in their N_TYPE | |
420 | ||
421 | Symbols that don't are: | |
422 | * symbols that are registers | |
423 | * symbols with \1 as their 3rd character (numeric labels) | |
424 | * "local labels" as defined by S_LOCAL_NAME(name) | |
425 | if the -L switch was passed to gas. | |
426 | ||
427 | All other symbols are output. We complain if a deleted | |
428 | symbol was marked external. */ | |
429 | ||
430 | ||
431 | if (!S_IS_REGISTER(symbolP) | |
432 | && (!S_GET_NAME(symbolP) | |
433 | || S_IS_DEBUG(symbolP) | |
434 | #ifdef TC_I960 | |
435 | /* FIXME-SOON this ifdef seems highly dubious to me. xoxorich. */ | |
436 | || !S_IS_DEFINED(symbolP) | |
437 | || S_IS_EXTERNAL(symbolP) | |
438 | #endif /* TC_I960 */ | |
439 | || (S_GET_NAME(symbolP)[0] != '\001' && (flagseen ['L'] || ! S_LOCAL_NAME(symbolP))))) { | |
440 | symbolP->sy_number = symbol_number++; | |
441 | ||
442 | /* The + 1 after strlen account for the \0 at the | |
443 | end of each string */ | |
444 | if (!S_IS_STABD(symbolP)) { | |
445 | /* Ordinary case. */ | |
446 | symbolP->sy_name_offset = string_byte_count; | |
447 | string_byte_count += strlen(S_GET_NAME(symbolP)) + 1; | |
448 | } | |
449 | else /* .Stabd case. */ | |
450 | symbolP->sy_name_offset = 0; | |
451 | symbolPP = &(symbol_next(symbolP)); | |
452 | } else { | |
453 | if (S_IS_EXTERNAL(symbolP) || !S_IS_DEFINED(symbolP)) { | |
454 | as_bad("Local symbol %s never defined", S_GET_NAME(symbolP)); | |
455 | } /* oops. */ | |
456 | ||
457 | /* Unhook it from the chain */ | |
458 | *symbolPP = symbol_next(symbolP); | |
459 | } /* if this symbol should be in the output */ | |
460 | } /* for each symbol */ | |
461 | ||
462 | H_SET_SYMBOL_TABLE_SIZE(headers, symbol_number); | |
463 | ||
464 | return; | |
465 | } /* obj_crawl_symbol_chain() */ | |
466 | ||
467 | /* | |
468 | * Find strings by crawling along symbol table chain. | |
469 | */ | |
470 | ||
471 | void obj_emit_strings(where) | |
472 | char **where; | |
473 | { | |
474 | symbolS *symbolP; | |
475 | ||
476 | #ifdef CROSS_ASSEMBLE | |
477 | /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */ | |
478 | md_number_to_chars(*where, string_byte_count, sizeof(string_byte_count)); | |
479 | *where += sizeof(string_byte_count); | |
480 | #else /* CROSS_ASSEMBLE */ | |
481 | append (where, (char *)&string_byte_count, (unsigned long)sizeof(string_byte_count)); | |
482 | #endif /* CROSS_ASSEMBLE */ | |
483 | ||
484 | for(symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) { | |
485 | if(S_GET_NAME(symbolP)) | |
486 | append(&next_object_file_charP, S_GET_NAME(symbolP), | |
487 | (unsigned long)(strlen (S_GET_NAME(symbolP)) + 1)); | |
488 | } /* walk symbol chain */ | |
489 | ||
490 | return; | |
491 | } /* obj_emit_strings() */ | |
492 | ||
493 | /* | |
494 | * Local Variables: | |
495 | * comment-column: 0 | |
496 | * fill-column: 131 | |
497 | * End: | |
498 | */ | |
499 | ||
500 | /* end of obj-aout.c */ |