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e57f8c65 | 1 | /* Mach-O object file format |
68588f95 | 2 | Copyright 2009, 2011, 2012 Free Software Foundation, Inc. |
e57f8c65 TG |
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 3, | |
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 License | |
17 | along with GAS; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA | |
19 | 02110-1301, USA. */ | |
20 | ||
a4551119 TG |
21 | /* Here we handle the mach-o directives that are common to all architectures. |
22 | ||
23 | Most significant are mach-o named sections and a variety of symbol type | |
24 | decorations. */ | |
25 | ||
26 | /* Mach-O supports multiple, named segments each of which may contain | |
27 | multiple named sections. Thus the concept of subsectioning is | |
28 | handled by (say) having a __TEXT segment with appropriate flags from | |
29 | which subsections are generated like __text, __const etc. | |
30 | ||
31 | The well-known as short-hand section switch directives like .text, .data | |
32 | etc. are mapped onto predefined segment/section pairs using facilites | |
33 | supplied by the mach-o port of bfd. | |
34 | ||
35 | A number of additional mach-o short-hand section switch directives are | |
36 | also defined. */ | |
37 | ||
e57f8c65 TG |
38 | #define OBJ_HEADER "obj-macho.h" |
39 | ||
40 | #include "as.h" | |
74a6005f TG |
41 | #include "subsegs.h" |
42 | #include "symbols.h" | |
43 | #include "write.h" | |
e57f8c65 | 44 | #include "mach-o.h" |
74a6005f | 45 | #include "mach-o/loader.h" |
a4551119 TG |
46 | #include "obj-macho.h" |
47 | ||
c3402d20 IS |
48 | #include <string.h> |
49 | ||
8cf6e084 IS |
50 | /* Forward decls. */ |
51 | static segT obj_mach_o_segT_from_bfd_name (const char *, int); | |
bcf0aac6 | 52 | |
a4551119 TG |
53 | /* TODO: Implement "-dynamic"/"-static" command line options. */ |
54 | ||
55 | static int obj_mach_o_is_static; | |
56 | ||
bcf0aac6 IS |
57 | /* TODO: Implement the "-n" command line option to suppress the initial |
58 | switch to the text segment. */ | |
59 | static int obj_mach_o_start_with_text_section = 1; | |
60 | ||
a4551119 TG |
61 | /* Allow for special re-ordering on output. */ |
62 | ||
bcf0aac6 IS |
63 | static int obj_mach_o_seen_objc_section; |
64 | ||
65 | /* Start-up: At present, just create the sections we want. */ | |
66 | void | |
67 | mach_o_begin (void) | |
68 | { | |
69 | /* Mach-O only defines the .text section by default, and even this can | |
70 | be suppressed by a flag. In the latter event, the first code MUST | |
71 | be a section definition. */ | |
72 | if (obj_mach_o_start_with_text_section) | |
73 | { | |
74 | text_section = obj_mach_o_segT_from_bfd_name (TEXT_SECTION_NAME, 1); | |
75 | subseg_set (text_section, 0); | |
76 | if (obj_mach_o_is_static) | |
77 | { | |
78 | bfd_mach_o_section *mo_sec | |
79 | = bfd_mach_o_get_mach_o_section (text_section); | |
80 | mo_sec->flags &= ~BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS; | |
81 | } | |
82 | } | |
83 | } | |
e57f8c65 | 84 | |
0c9ef0f0 TG |
85 | /* Remember the subsections_by_symbols state in case we need to reset |
86 | the file flags. */ | |
0c9ef0f0 | 87 | |
b22161d6 | 88 | static int obj_mach_o_subsections_by_symbols; |
e57f8c65 | 89 | |
a4551119 TG |
90 | /* This will put at most 16 characters (terminated by a ',' or newline) from |
91 | the input stream into dest. If there are more than 16 chars before the | |
92 | delimiter, a warning is given and the string is truncated. On completion of | |
93 | this function, input_line_pointer will point to the char after the ',' or | |
94 | to the newline. | |
95 | ||
96 | It trims leading and trailing space. */ | |
97 | ||
98 | static int | |
99 | collect_16char_name (char *dest, const char *msg, int require_comma) | |
100 | { | |
101 | char c, *namstart; | |
102 | ||
103 | SKIP_WHITESPACE (); | |
104 | namstart = input_line_pointer; | |
105 | ||
106 | while ( (c = *input_line_pointer) != ',' | |
107 | && !is_end_of_line[(unsigned char) c]) | |
108 | input_line_pointer++; | |
109 | ||
110 | { | |
111 | int len = input_line_pointer - namstart; /* could be zero. */ | |
112 | /* lose any trailing space. */ | |
113 | while (len > 0 && namstart[len-1] == ' ') | |
114 | len--; | |
115 | if (len > 16) | |
116 | { | |
117 | *input_line_pointer = '\0'; /* make a temp string. */ | |
118 | as_bad (_("the %s name '%s' is too long (maximum 16 characters)"), | |
119 | msg, namstart); | |
120 | *input_line_pointer = c; /* restore for printing. */ | |
121 | len = 16; | |
122 | } | |
123 | if (len > 0) | |
124 | memcpy (dest, namstart, len); | |
125 | } | |
126 | ||
127 | if (c != ',' && require_comma) | |
128 | { | |
129 | as_bad (_("expected a %s name followed by a `,'"), msg); | |
130 | return 1; | |
131 | } | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
8cf6e084 IS |
136 | static int |
137 | obj_mach_o_get_section_names (char *seg, char *sec, | |
138 | unsigned segl, unsigned secl) | |
139 | { | |
140 | /* Zero-length segment and section names are allowed. */ | |
141 | /* Parse segment name. */ | |
142 | memset (seg, 0, segl); | |
143 | if (collect_16char_name (seg, "segment", 1)) | |
144 | { | |
145 | ignore_rest_of_line (); | |
146 | return 0; | |
147 | } | |
148 | input_line_pointer++; /* Skip the terminating ',' */ | |
149 | ||
150 | /* Parse section name, which can be empty. */ | |
151 | memset (sec, 0, secl); | |
152 | collect_16char_name (sec, "section", 0); | |
153 | return 1; | |
154 | } | |
155 | ||
156 | /* Build (or get) a section from the mach-o description - which includes | |
157 | optional definitions for type, attributes, alignment and stub size. | |
158 | ||
159 | BFD supplies default values for sections which have a canonical name. */ | |
160 | ||
161 | #define SECT_TYPE_SPECIFIED 0x0001 | |
162 | #define SECT_ATTR_SPECIFIED 0x0002 | |
163 | #define SECT_ALGN_SPECIFIED 0x0004 | |
164 | ||
165 | static segT | |
166 | obj_mach_o_make_or_get_sect (char * segname, char * sectname, | |
167 | unsigned int specified_mask, | |
168 | unsigned int usectype, unsigned int usecattr, | |
169 | unsigned int ualign, offsetT stub_size) | |
170 | { | |
171 | unsigned int sectype, secattr, secalign; | |
172 | flagword oldflags, flags; | |
173 | const char *name; | |
174 | segT sec; | |
175 | bfd_mach_o_section *msect; | |
176 | const mach_o_section_name_xlat *xlat; | |
177 | ||
178 | /* This provides default bfd flags and default mach-o section type and | |
179 | attributes along with the canonical name. */ | |
180 | xlat = bfd_mach_o_section_data_for_mach_sect (stdoutput, segname, sectname); | |
181 | ||
182 | /* TODO: more checking of whether overides are acually allowed. */ | |
183 | ||
184 | if (xlat != NULL) | |
185 | { | |
186 | name = xstrdup (xlat->bfd_name); | |
187 | sectype = xlat->macho_sectype; | |
188 | if (specified_mask & SECT_TYPE_SPECIFIED) | |
189 | { | |
190 | if ((sectype == BFD_MACH_O_S_ZEROFILL | |
191 | || sectype == BFD_MACH_O_S_GB_ZEROFILL) | |
192 | && sectype != usectype) | |
193 | as_bad (_("cannot overide zerofill section type for `%s,%s'"), | |
194 | segname, sectname); | |
195 | else | |
196 | sectype = usectype; | |
197 | } | |
198 | secattr = xlat->macho_secattr; | |
199 | secalign = xlat->sectalign; | |
200 | flags = xlat->bfd_flags; | |
201 | } | |
202 | else | |
203 | { | |
204 | /* There is no normal BFD section name for this section. Create one. | |
205 | The name created doesn't really matter as it will never be written | |
206 | on disk. */ | |
207 | size_t seglen = strlen (segname); | |
208 | size_t sectlen = strlen (sectname); | |
209 | char *n; | |
210 | ||
211 | n = xmalloc (seglen + 1 + sectlen + 1); | |
212 | memcpy (n, segname, seglen); | |
213 | n[seglen] = '.'; | |
214 | memcpy (n + seglen + 1, sectname, sectlen); | |
215 | n[seglen + 1 + sectlen] = 0; | |
216 | name = n; | |
217 | if (specified_mask & SECT_TYPE_SPECIFIED) | |
218 | sectype = usectype; | |
219 | else | |
220 | sectype = BFD_MACH_O_S_REGULAR; | |
221 | secattr = BFD_MACH_O_S_ATTR_NONE; | |
222 | secalign = 0; | |
223 | flags = SEC_NO_FLAGS; | |
224 | } | |
225 | ||
226 | /* For now, just use what the user provided. */ | |
227 | ||
228 | if (specified_mask & SECT_ATTR_SPECIFIED) | |
229 | secattr = usecattr; | |
230 | ||
231 | if (specified_mask & SECT_ALGN_SPECIFIED) | |
232 | secalign = ualign; | |
233 | ||
234 | /* Sub-segments don't exists as is on Mach-O. */ | |
235 | sec = subseg_new (name, 0); | |
236 | ||
237 | oldflags = bfd_get_section_flags (stdoutput, sec); | |
238 | msect = bfd_mach_o_get_mach_o_section (sec); | |
239 | ||
240 | if (oldflags == SEC_NO_FLAGS) | |
241 | { | |
242 | /* New, so just use the defaults or what's specified. */ | |
243 | if (! bfd_set_section_flags (stdoutput, sec, flags)) | |
244 | as_warn (_("failed to set flags for \"%s\": %s"), | |
245 | bfd_section_name (stdoutput, sec), | |
246 | bfd_errmsg (bfd_get_error ())); | |
247 | ||
248 | strncpy (msect->segname, segname, sizeof (msect->segname)); | |
249 | strncpy (msect->sectname, sectname, sizeof (msect->sectname)); | |
250 | ||
251 | msect->align = secalign; | |
252 | msect->flags = sectype | secattr; | |
253 | msect->reserved2 = stub_size; | |
254 | ||
255 | if (sectype == BFD_MACH_O_S_ZEROFILL | |
256 | || sectype == BFD_MACH_O_S_GB_ZEROFILL) | |
257 | seg_info (sec)->bss = 1; | |
258 | } | |
259 | else if (flags != SEC_NO_FLAGS) | |
260 | { | |
261 | if (flags != oldflags | |
262 | || msect->flags != (secattr | sectype)) | |
263 | as_warn (_("Ignoring changed section attributes for %s"), name); | |
264 | } | |
265 | ||
266 | return sec; | |
267 | } | |
268 | ||
a4551119 TG |
269 | /* .section |
270 | ||
271 | The '.section' specification syntax looks like: | |
272 | .section <segment> , <section> [, type [, attribs [, size]]] | |
273 | ||
274 | White space is allowed everywhere between elements. | |
275 | ||
276 | <segment> and <section> may be from 0 to 16 chars in length - they may | |
277 | contain spaces but leading and trailing space will be trimmed. It is | |
278 | mandatory that they be present (or that zero-length names are indicated | |
279 | by ",,"). | |
280 | ||
281 | There is only a single section type for any entry. | |
282 | ||
283 | There may be multiple attributes, they are delimited by `+'. | |
284 | ||
285 | Not all section types and attributes are accepted by the Darwin system | |
286 | assemblers as user-specifiable - although, at present, we do here. */ | |
74a6005f TG |
287 | |
288 | static void | |
289 | obj_mach_o_section (int ignore ATTRIBUTE_UNUSED) | |
290 | { | |
a4551119 | 291 | unsigned int sectype = BFD_MACH_O_S_REGULAR; |
8cf6e084 | 292 | unsigned int specified_mask = 0; |
74a6005f TG |
293 | unsigned int secattr = 0; |
294 | offsetT sizeof_stub = 0; | |
8cf6e084 | 295 | segT new_seg; |
a4551119 TG |
296 | char segname[17]; |
297 | char sectname[17]; | |
74a6005f | 298 | |
ab76eeaf IS |
299 | #ifdef md_flush_pending_output |
300 | md_flush_pending_output (); | |
301 | #endif | |
302 | ||
8cf6e084 IS |
303 | /* Get the User's segment annd section names. */ |
304 | if (! obj_mach_o_get_section_names (segname, sectname, 17, 17)) | |
305 | return; | |
74a6005f | 306 | |
8cf6e084 | 307 | /* Parse section type, if present. */ |
74a6005f TG |
308 | if (*input_line_pointer == ',') |
309 | { | |
8cf6e084 IS |
310 | char *p; |
311 | char c; | |
a4551119 TG |
312 | char tmpc; |
313 | int len; | |
74a6005f | 314 | input_line_pointer++; |
a4551119 | 315 | SKIP_WHITESPACE (); |
74a6005f | 316 | p = input_line_pointer; |
a4551119 TG |
317 | while ((c = *input_line_pointer) != ',' |
318 | && !is_end_of_line[(unsigned char) c]) | |
319 | input_line_pointer++; | |
320 | ||
321 | len = input_line_pointer - p; | |
322 | /* strip trailing spaces. */ | |
323 | while (len > 0 && p[len-1] == ' ') | |
324 | len--; | |
325 | tmpc = p[len]; | |
326 | ||
327 | /* Temporarily make a string from the token. */ | |
328 | p[len] = 0; | |
ab76eeaf | 329 | sectype = bfd_mach_o_get_section_type_from_name (stdoutput, p); |
a4551119 | 330 | if (sectype > 255) /* Max Section ID == 255. */ |
74a6005f TG |
331 | { |
332 | as_bad (_("unknown or invalid section type '%s'"), p); | |
ab76eeaf IS |
333 | p[len] = tmpc; |
334 | ignore_rest_of_line (); | |
335 | return; | |
74a6005f | 336 | } |
a4551119 | 337 | else |
8cf6e084 | 338 | specified_mask |= SECT_TYPE_SPECIFIED; |
a4551119 | 339 | /* Restore. */ |
ab76eeaf | 340 | p[len] = tmpc; |
a4551119 TG |
341 | |
342 | /* Parse attributes. | |
343 | TODO: check validity of attributes for section type. */ | |
8cf6e084 IS |
344 | if ((specified_mask & SECT_TYPE_SPECIFIED) |
345 | && c == ',') | |
74a6005f TG |
346 | { |
347 | do | |
348 | { | |
349 | int attr; | |
350 | ||
a4551119 | 351 | /* Skip initial `,' and subsequent `+'. */ |
74a6005f | 352 | input_line_pointer++; |
a4551119 TG |
353 | SKIP_WHITESPACE (); |
354 | p = input_line_pointer; | |
355 | while ((c = *input_line_pointer) != '+' | |
356 | && c != ',' | |
357 | && !is_end_of_line[(unsigned char) c]) | |
358 | input_line_pointer++; | |
359 | ||
360 | len = input_line_pointer - p; | |
361 | /* strip trailing spaces. */ | |
362 | while (len > 0 && p[len-1] == ' ') | |
363 | len--; | |
364 | tmpc = p[len]; | |
365 | ||
366 | /* Temporarily make a string from the token. */ | |
367 | p[len] ='\0'; | |
74a6005f | 368 | attr = bfd_mach_o_get_section_attribute_from_name (p); |
a4551119 | 369 | if (attr == -1) |
ab76eeaf IS |
370 | { |
371 | as_bad (_("unknown or invalid section attribute '%s'"), p); | |
372 | p[len] = tmpc; | |
373 | ignore_rest_of_line (); | |
374 | return; | |
375 | } | |
74a6005f | 376 | else |
a4551119 | 377 | { |
8cf6e084 | 378 | specified_mask |= SECT_ATTR_SPECIFIED; |
a4551119 TG |
379 | secattr |= attr; |
380 | } | |
381 | /* Restore. */ | |
382 | p[len] = tmpc; | |
74a6005f TG |
383 | } |
384 | while (*input_line_pointer == '+'); | |
385 | ||
386 | /* Parse sizeof_stub. */ | |
8cf6e084 IS |
387 | if ((specified_mask & SECT_ATTR_SPECIFIED) |
388 | && *input_line_pointer == ',') | |
74a6005f TG |
389 | { |
390 | if (sectype != BFD_MACH_O_S_SYMBOL_STUBS) | |
ab76eeaf IS |
391 | { |
392 | as_bad (_("unexpected section size information")); | |
393 | ignore_rest_of_line (); | |
394 | return; | |
395 | } | |
74a6005f | 396 | |
a4551119 | 397 | input_line_pointer++; |
74a6005f TG |
398 | sizeof_stub = get_absolute_expression (); |
399 | } | |
8cf6e084 IS |
400 | else if ((specified_mask & SECT_ATTR_SPECIFIED) |
401 | && sectype == BFD_MACH_O_S_SYMBOL_STUBS) | |
ab76eeaf IS |
402 | { |
403 | as_bad (_("missing sizeof_stub expression")); | |
404 | ignore_rest_of_line (); | |
405 | return; | |
406 | } | |
74a6005f TG |
407 | } |
408 | } | |
74a6005f | 409 | |
8cf6e084 IS |
410 | new_seg = obj_mach_o_make_or_get_sect (segname, sectname, specified_mask, |
411 | sectype, secattr, 0 /*align */, | |
412 | sizeof_stub); | |
413 | if (new_seg != NULL) | |
a4551119 | 414 | { |
8cf6e084 IS |
415 | subseg_set (new_seg, 0); |
416 | demand_empty_rest_of_line (); | |
a4551119 | 417 | } |
8cf6e084 | 418 | } |
74a6005f | 419 | |
8cf6e084 | 420 | /* .zerofill segname, sectname [, symbolname, size [, align]] |
74a6005f | 421 | |
8cf6e084 | 422 | Zerofill switches, temporarily, to a sect of type 'zerofill'. |
74a6005f | 423 | |
8cf6e084 IS |
424 | If a variable name is given, it defines that in the section. |
425 | Otherwise it just creates the section if it doesn't exist. */ | |
426 | ||
427 | static void | |
428 | obj_mach_o_zerofill (int ignore ATTRIBUTE_UNUSED) | |
429 | { | |
430 | char segname[17]; | |
431 | char sectname[17]; | |
432 | segT old_seg = now_seg; | |
433 | segT new_seg; | |
434 | symbolS *sym = NULL; | |
435 | unsigned int align = 0; | |
436 | unsigned int specified_mask = 0; | |
facf03f2 | 437 | offsetT size = 0; |
8cf6e084 IS |
438 | |
439 | #ifdef md_flush_pending_output | |
440 | md_flush_pending_output (); | |
441 | #endif | |
442 | ||
443 | /* Get the User's segment annd section names. */ | |
444 | if (! obj_mach_o_get_section_names (segname, sectname, 17, 17)) | |
445 | return; | |
446 | ||
447 | /* Parse variable definition, if present. */ | |
448 | if (*input_line_pointer == ',') | |
74a6005f | 449 | { |
8cf6e084 IS |
450 | /* Parse symbol, size [.align] |
451 | We follow the method of s_common_internal, with the difference | |
452 | that the symbol cannot be a duplicate-common. */ | |
453 | char *name; | |
454 | char c; | |
455 | char *p; | |
456 | expressionS exp; | |
457 | ||
458 | input_line_pointer++; /* Skip ',' */ | |
459 | SKIP_WHITESPACE (); | |
460 | name = input_line_pointer; | |
461 | c = get_symbol_end (); | |
462 | /* Just after name is now '\0'. */ | |
463 | p = input_line_pointer; | |
464 | *p = c; | |
465 | ||
466 | if (name == p) | |
a4551119 | 467 | { |
8cf6e084 IS |
468 | as_bad (_("expected symbol name")); |
469 | ignore_rest_of_line (); | |
470 | goto done; | |
471 | } | |
472 | ||
473 | SKIP_WHITESPACE (); | |
474 | if (*input_line_pointer == ',') | |
475 | input_line_pointer++; | |
476 | ||
477 | expression_and_evaluate (&exp); | |
478 | if (exp.X_op != O_constant | |
479 | && exp.X_op != O_absent) | |
480 | { | |
481 | as_bad (_("bad or irreducible absolute expression")); | |
482 | ignore_rest_of_line (); | |
483 | goto done; | |
484 | } | |
485 | else if (exp.X_op == O_absent) | |
486 | { | |
487 | as_bad (_("missing size expression")); | |
488 | ignore_rest_of_line (); | |
489 | goto done; | |
490 | } | |
491 | ||
492 | size = exp.X_add_number; | |
493 | size &= ((offsetT) 2 << (stdoutput->arch_info->bits_per_address - 1)) - 1; | |
494 | if (exp.X_add_number != size || !exp.X_unsigned) | |
495 | { | |
496 | as_warn (_("size (%ld) out of range, ignored"), | |
497 | (long) exp.X_add_number); | |
498 | ignore_rest_of_line (); | |
499 | goto done; | |
500 | } | |
501 | ||
502 | *p = 0; /* Make the name into a c string for err messages. */ | |
503 | sym = symbol_find_or_make (name); | |
504 | if (S_IS_DEFINED (sym) || symbol_equated_p (sym)) | |
505 | { | |
506 | as_bad (_("symbol `%s' is already defined"), name); | |
507 | *p = c; | |
508 | ignore_rest_of_line (); | |
509 | goto done; | |
510 | } | |
511 | ||
512 | size = S_GET_VALUE (sym); | |
513 | if (size == 0) | |
514 | size = exp.X_add_number; | |
515 | else if (size != exp.X_add_number) | |
516 | as_warn (_("size of \"%s\" is already %ld; not changing to %ld"), | |
517 | name, (long) size, (long) exp.X_add_number); | |
518 | ||
519 | *p = c; /* Restore the termination char. */ | |
520 | ||
521 | SKIP_WHITESPACE (); | |
522 | if (*input_line_pointer == ',') | |
523 | { | |
524 | align = (unsigned int) parse_align (0); | |
525 | if (align == (unsigned int) -1) | |
526 | { | |
527 | as_warn (_("align value not recognized, using size")); | |
528 | align = size; | |
529 | } | |
530 | if (align > 15) | |
531 | { | |
532 | as_warn (_("Alignment (%lu) too large: 15 assumed."), | |
533 | (unsigned long)align); | |
534 | align = 15; | |
535 | } | |
536 | specified_mask |= SECT_ALGN_SPECIFIED; | |
a4551119 | 537 | } |
74a6005f | 538 | } |
8cf6e084 IS |
539 | /* else just a section definition. */ |
540 | ||
541 | specified_mask |= SECT_TYPE_SPECIFIED; | |
542 | new_seg = obj_mach_o_make_or_get_sect (segname, sectname, specified_mask, | |
543 | BFD_MACH_O_S_ZEROFILL, | |
544 | BFD_MACH_O_S_ATTR_NONE, | |
545 | align, (offsetT) 0 /*stub size*/); | |
546 | if (new_seg == NULL) | |
547 | return; | |
548 | ||
549 | /* In case the user specifies the bss section by mach-o name. | |
550 | Create it on demand */ | |
551 | if (strcmp (new_seg->name, BSS_SECTION_NAME) == 0 | |
552 | && bss_section == NULL) | |
553 | bss_section = new_seg; | |
554 | ||
555 | subseg_set (new_seg, 0); | |
556 | ||
557 | if (sym != NULL) | |
74a6005f | 558 | { |
8cf6e084 IS |
559 | char *pfrag; |
560 | ||
561 | if (align) | |
562 | { | |
563 | record_alignment (new_seg, align); | |
564 | frag_align (align, 0, 0); | |
565 | } | |
566 | ||
567 | /* Detach from old frag. */ | |
568 | if (S_GET_SEGMENT (sym) == new_seg) | |
569 | symbol_get_frag (sym)->fr_symbol = NULL; | |
570 | ||
571 | symbol_set_frag (sym, frag_now); | |
572 | pfrag = frag_var (rs_org, 1, 1, 0, sym, size, NULL); | |
573 | *pfrag = 0; | |
574 | ||
575 | S_SET_SEGMENT (sym, new_seg); | |
576 | if (new_seg == bss_section) | |
577 | S_CLEAR_EXTERNAL (sym); | |
74a6005f | 578 | } |
8cf6e084 IS |
579 | |
580 | done: | |
581 | /* switch back to the section that was current before the .zerofill. */ | |
582 | subseg_set (old_seg, 0); | |
74a6005f TG |
583 | } |
584 | ||
a4551119 TG |
585 | static segT |
586 | obj_mach_o_segT_from_bfd_name (const char *nam, int must_succeed) | |
74a6005f | 587 | { |
a4551119 TG |
588 | const mach_o_section_name_xlat *xlat; |
589 | const char *segn; | |
590 | segT sec; | |
591 | ||
592 | /* BFD has tables of flags and default attributes for all the sections that | |
593 | have a 'canonical' name. */ | |
594 | xlat = bfd_mach_o_section_data_for_bfd_name (stdoutput, nam, &segn); | |
595 | if (xlat == NULL) | |
596 | { | |
597 | if (must_succeed) | |
598 | as_fatal (_("BFD is out of sync with GAS, " | |
599 | "unhandled well-known section type `%s'"), nam); | |
600 | return NULL; | |
601 | } | |
602 | ||
603 | sec = bfd_get_section_by_name (stdoutput, nam); | |
604 | if (sec == NULL) | |
605 | { | |
606 | bfd_mach_o_section *msect; | |
607 | ||
608 | sec = subseg_force_new (xlat->bfd_name, 0); | |
609 | ||
610 | /* Set default type, attributes and alignment. */ | |
611 | msect = bfd_mach_o_get_mach_o_section (sec); | |
612 | msect->flags = xlat->macho_sectype | xlat->macho_secattr; | |
613 | msect->align = xlat->sectalign; | |
614 | ||
615 | if ((msect->flags & BFD_MACH_O_SECTION_TYPE_MASK) | |
616 | == BFD_MACH_O_S_ZEROFILL) | |
617 | seg_info (sec)->bss = 1; | |
618 | } | |
619 | ||
620 | return sec; | |
621 | } | |
622 | ||
623 | static const char * const known_sections[] = | |
624 | { | |
625 | /* 0 */ NULL, | |
626 | /* __TEXT */ | |
627 | /* 1 */ ".const", | |
628 | /* 2 */ ".static_const", | |
629 | /* 3 */ ".cstring", | |
630 | /* 4 */ ".literal4", | |
631 | /* 5 */ ".literal8", | |
632 | /* 6 */ ".literal16", | |
633 | /* 7 */ ".constructor", | |
634 | /* 8 */ ".destructor", | |
635 | /* 9 */ ".eh_frame", | |
636 | /* __DATA */ | |
637 | /* 10 */ ".const_data", | |
638 | /* 11 */ ".static_data", | |
639 | /* 12 */ ".mod_init_func", | |
640 | /* 13 */ ".mod_term_func", | |
641 | /* 14 */ ".dyld", | |
642 | /* 15 */ ".cfstring" | |
74a6005f TG |
643 | }; |
644 | ||
a4551119 | 645 | /* Interface for a known non-optional section directive. */ |
74a6005f TG |
646 | |
647 | static void | |
648 | obj_mach_o_known_section (int sect_index) | |
649 | { | |
a4551119 TG |
650 | segT section; |
651 | ||
652 | #ifdef md_flush_pending_output | |
653 | md_flush_pending_output (); | |
654 | #endif | |
655 | ||
656 | section = obj_mach_o_segT_from_bfd_name (known_sections[sect_index], 1); | |
657 | if (section != NULL) | |
658 | subseg_set (section, 0); | |
659 | ||
660 | /* else, we leave the section as it was; there was a fatal error anyway. */ | |
661 | } | |
662 | ||
663 | static const char * const objc_sections[] = | |
664 | { | |
665 | /* 0 */ NULL, | |
666 | /* 1 */ ".objc_class", | |
667 | /* 2 */ ".objc_meta_class", | |
668 | /* 3 */ ".objc_cat_cls_meth", | |
669 | /* 4 */ ".objc_cat_inst_meth", | |
670 | /* 5 */ ".objc_protocol", | |
671 | /* 6 */ ".objc_string_object", | |
672 | /* 7 */ ".objc_cls_meth", | |
673 | /* 8 */ ".objc_inst_meth", | |
674 | /* 9 */ ".objc_cls_refs", | |
675 | /* 10 */ ".objc_message_refs", | |
676 | /* 11 */ ".objc_symbols", | |
677 | /* 12 */ ".objc_category", | |
678 | /* 13 */ ".objc_class_vars", | |
679 | /* 14 */ ".objc_instance_vars", | |
680 | /* 15 */ ".objc_module_info", | |
681 | /* 16 */ ".cstring", /* objc_class_names Alias for .cstring */ | |
682 | /* 17 */ ".cstring", /* Alias objc_meth_var_types for .cstring */ | |
683 | /* 18 */ ".cstring", /* objc_meth_var_names Alias for .cstring */ | |
684 | /* 19 */ ".objc_selector_strs", | |
685 | /* 20 */ ".objc_image_info", /* extension. */ | |
686 | /* 21 */ ".objc_selector_fixup", /* extension. */ | |
687 | /* 22 */ ".objc1_class_ext", /* ObjC-1 extension. */ | |
688 | /* 23 */ ".objc1_property_list", /* ObjC-1 extension. */ | |
689 | /* 24 */ ".objc1_protocol_ext" /* ObjC-1 extension. */ | |
690 | }; | |
691 | ||
692 | /* This currently does the same as known_sections, but kept separate for | |
693 | ease of maintenance. */ | |
694 | ||
695 | static void | |
696 | obj_mach_o_objc_section (int sect_index) | |
697 | { | |
698 | segT section; | |
699 | ||
700 | #ifdef md_flush_pending_output | |
701 | md_flush_pending_output (); | |
702 | #endif | |
703 | ||
704 | section = obj_mach_o_segT_from_bfd_name (objc_sections[sect_index], 1); | |
705 | if (section != NULL) | |
706 | { | |
bcf0aac6 IS |
707 | obj_mach_o_seen_objc_section = 1; /* We need to ensure that certain |
708 | sections are present and in the | |
709 | right order. */ | |
a4551119 TG |
710 | subseg_set (section, 0); |
711 | } | |
712 | ||
713 | /* else, we leave the section as it was; there was a fatal error anyway. */ | |
714 | } | |
715 | ||
716 | /* Debug section directives. */ | |
717 | ||
718 | static const char * const debug_sections[] = | |
719 | { | |
720 | /* 0 */ NULL, | |
721 | /* __DWARF */ | |
722 | /* 1 */ ".debug_frame", | |
723 | /* 2 */ ".debug_info", | |
724 | /* 3 */ ".debug_abbrev", | |
725 | /* 4 */ ".debug_aranges", | |
726 | /* 5 */ ".debug_macinfo", | |
727 | /* 6 */ ".debug_line", | |
728 | /* 7 */ ".debug_loc", | |
729 | /* 8 */ ".debug_pubnames", | |
730 | /* 9 */ ".debug_pubtypes", | |
731 | /* 10 */ ".debug_str", | |
732 | /* 11 */ ".debug_ranges", | |
733 | /* 12 */ ".debug_macro" | |
734 | }; | |
735 | ||
736 | /* ??? Maybe these should be conditional on gdwarf-*. | |
737 | It`s also likely that we will need to be able to set them from the cfi | |
738 | code. */ | |
739 | ||
740 | static void | |
741 | obj_mach_o_debug_section (int sect_index) | |
742 | { | |
743 | segT section; | |
744 | ||
745 | #ifdef md_flush_pending_output | |
746 | md_flush_pending_output (); | |
747 | #endif | |
748 | ||
749 | section = obj_mach_o_segT_from_bfd_name (debug_sections[sect_index], 1); | |
750 | if (section != NULL) | |
751 | subseg_set (section, 0); | |
752 | ||
753 | /* else, we leave the section as it was; there was a fatal error anyway. */ | |
754 | } | |
755 | ||
756 | /* This could be moved to the tc-xx files, but there is so little dependency | |
757 | there, that the code might as well be shared. */ | |
758 | ||
759 | struct opt_tgt_sect | |
760 | { | |
761 | const char *name; | |
762 | unsigned x86_val; | |
763 | unsigned ppc_val; | |
764 | }; | |
765 | ||
766 | /* The extensions here are for specific sections that are generated by GCC | |
767 | and Darwin system tools, but don't have directives in the `system as'. */ | |
768 | ||
769 | static const struct opt_tgt_sect tgt_sections[] = | |
770 | { | |
771 | /* 0 */ { NULL, 0, 0}, | |
772 | /* 1 */ { ".lazy_symbol_pointer", 0, 0}, | |
773 | /* 2 */ { ".lazy_symbol_pointer2", 0, 0}, /* X86 - extension */ | |
774 | /* 3 */ { ".lazy_symbol_pointer3", 0, 0}, /* X86 - extension */ | |
775 | /* 4 */ { ".non_lazy_symbol_pointer", 0, 0}, | |
776 | /* 5 */ { ".non_lazy_symbol_pointer_x86", 0, 0}, /* X86 - extension */ | |
777 | /* 6 */ { ".symbol_stub", 16, 20}, | |
778 | /* 7 */ { ".symbol_stub1", 0, 16}, /* PPC - extension */ | |
779 | /* 8 */ { ".picsymbol_stub", 26, 36}, | |
780 | /* 9 */ { ".picsymbol_stub1", 0, 32}, /* PPC - extension */ | |
781 | /* 10 */ { ".picsymbol_stub2", 25, 0}, /* X86 - extension */ | |
782 | /* 11 */ { ".picsymbol_stub3", 5, 0}, /* X86 - extension */ | |
783 | }; | |
784 | ||
785 | /* Interface for an optional section directive. */ | |
786 | ||
787 | static void | |
788 | obj_mach_o_opt_tgt_section (int sect_index) | |
789 | { | |
790 | const struct opt_tgt_sect *tgtsct = &tgt_sections[sect_index]; | |
791 | segT section; | |
74a6005f TG |
792 | |
793 | #ifdef md_flush_pending_output | |
794 | md_flush_pending_output (); | |
795 | #endif | |
796 | ||
a4551119 TG |
797 | section = obj_mach_o_segT_from_bfd_name (tgtsct->name, 0); |
798 | if (section == NULL) | |
74a6005f | 799 | { |
a4551119 TG |
800 | as_bad (_("%s is not used for the selected target"), tgtsct->name); |
801 | /* Leave the section as it is. */ | |
74a6005f TG |
802 | } |
803 | else | |
804 | { | |
a4551119 TG |
805 | bfd_mach_o_section *mo_sec = bfd_mach_o_get_mach_o_section (section); |
806 | subseg_set (section, 0); | |
807 | #if defined (TC_I386) | |
808 | mo_sec->reserved2 = tgtsct->x86_val; | |
809 | #elif defined (TC_PPC) | |
810 | mo_sec->reserved2 = tgtsct->ppc_val; | |
811 | #else | |
812 | mo_sec->reserved2 = 0; | |
813 | #endif | |
814 | } | |
815 | } | |
74a6005f | 816 | |
a4551119 TG |
817 | /* We don't necessarily have the three 'base' sections on mach-o. |
818 | Normally, we would start up with only the 'text' section defined. | |
819 | However, even that can be suppressed with (TODO) c/l option "-n". | |
820 | Thus, we have to be able to create all three sections on-demand. */ | |
74a6005f | 821 | |
a4551119 TG |
822 | static void |
823 | obj_mach_o_base_section (int sect_index) | |
824 | { | |
825 | segT section; | |
826 | ||
827 | #ifdef md_flush_pending_output | |
828 | md_flush_pending_output (); | |
829 | #endif | |
830 | ||
831 | /* We don't support numeric (or any other) qualifications on the | |
832 | well-known section shorthands. */ | |
833 | demand_empty_rest_of_line (); | |
834 | ||
835 | switch (sect_index) | |
836 | { | |
837 | /* Handle the three sections that are globally known within GAS. | |
838 | For Mach-O, these are created on demand rather than at startup. */ | |
839 | case 1: | |
840 | if (text_section == NULL) | |
841 | text_section = obj_mach_o_segT_from_bfd_name (TEXT_SECTION_NAME, 1); | |
842 | if (obj_mach_o_is_static) | |
843 | { | |
844 | bfd_mach_o_section *mo_sec | |
845 | = bfd_mach_o_get_mach_o_section (text_section); | |
846 | mo_sec->flags &= ~BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS; | |
847 | } | |
848 | section = text_section; | |
849 | break; | |
850 | case 2: | |
851 | if (data_section == NULL) | |
852 | data_section = obj_mach_o_segT_from_bfd_name (DATA_SECTION_NAME, 1); | |
853 | section = data_section; | |
854 | break; | |
855 | case 3: | |
856 | /* ??? maybe this achieves very little, as an addition. */ | |
857 | if (bss_section == NULL) | |
858 | { | |
859 | bss_section = obj_mach_o_segT_from_bfd_name (BSS_SECTION_NAME, 1); | |
860 | seg_info (bss_section)->bss = 1; | |
861 | } | |
862 | section = bss_section; | |
863 | break; | |
864 | default: | |
865 | as_fatal (_("internal error: base section index out of range")); | |
866 | return; | |
867 | break; | |
74a6005f | 868 | } |
a4551119 | 869 | subseg_set (section, 0); |
74a6005f TG |
870 | } |
871 | ||
a4551119 TG |
872 | /* This finishes off parsing a .comm or .lcomm statement, which both can have |
873 | an (optional) alignment field. It also allows us to create the bss section | |
874 | on demand. */ | |
74a6005f TG |
875 | |
876 | static symbolS * | |
a4551119 TG |
877 | obj_mach_o_common_parse (int is_local, symbolS *symbolP, |
878 | addressT size) | |
74a6005f TG |
879 | { |
880 | addressT align = 0; | |
b22161d6 | 881 | bfd_mach_o_asymbol *s; |
74a6005f | 882 | |
8cf6e084 IS |
883 | SKIP_WHITESPACE (); |
884 | ||
a4551119 TG |
885 | /* Both comm and lcomm take an optional alignment, as a power |
886 | of two between 1 and 15. */ | |
74a6005f TG |
887 | if (*input_line_pointer == ',') |
888 | { | |
a4551119 | 889 | /* We expect a power of 2. */ |
74a6005f TG |
890 | align = parse_align (0); |
891 | if (align == (addressT) -1) | |
892 | return NULL; | |
a4551119 TG |
893 | if (align > 15) |
894 | { | |
895 | as_warn (_("Alignment (%lu) too large: 15 assumed."), | |
896 | (unsigned long)align); | |
897 | align = 15; | |
898 | } | |
74a6005f TG |
899 | } |
900 | ||
b22161d6 | 901 | s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (symbolP); |
a4551119 TG |
902 | if (is_local) |
903 | { | |
904 | /* Create the BSS section on demand. */ | |
905 | if (bss_section == NULL) | |
906 | { | |
907 | bss_section = obj_mach_o_segT_from_bfd_name (BSS_SECTION_NAME, 1); | |
908 | seg_info (bss_section)->bss = 1; | |
909 | } | |
910 | bss_alloc (symbolP, size, align); | |
b22161d6 | 911 | s->n_type = BFD_MACH_O_N_SECT; |
a4551119 TG |
912 | S_CLEAR_EXTERNAL (symbolP); |
913 | } | |
914 | else | |
915 | { | |
916 | S_SET_VALUE (symbolP, size); | |
917 | S_SET_ALIGN (symbolP, align); | |
918 | S_SET_EXTERNAL (symbolP); | |
919 | S_SET_SEGMENT (symbolP, bfd_com_section_ptr); | |
b22161d6 | 920 | s->n_type = BFD_MACH_O_N_UNDF | BFD_MACH_O_N_EXT; |
a4551119 | 921 | } |
74a6005f | 922 | |
b22161d6 IS |
923 | /* This is a data object (whatever we choose that to mean). */ |
924 | s->symbol.flags |= BSF_OBJECT; | |
925 | ||
926 | /* We've set symbol qualifiers, so validate if you can. */ | |
927 | s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; | |
74a6005f TG |
928 | |
929 | return symbolP; | |
930 | } | |
931 | ||
932 | static void | |
a4551119 | 933 | obj_mach_o_comm (int is_local) |
74a6005f | 934 | { |
a4551119 | 935 | s_comm_internal (is_local, obj_mach_o_common_parse); |
74a6005f TG |
936 | } |
937 | ||
0c9ef0f0 TG |
938 | /* Set properties that apply to the whole file. At present, the only |
939 | one defined, is subsections_via_symbols. */ | |
940 | ||
941 | typedef enum obj_mach_o_file_properties { | |
942 | OBJ_MACH_O_FILE_PROP_NONE = 0, | |
943 | OBJ_MACH_O_FILE_PROP_SUBSECTS_VIA_SYMS, | |
944 | OBJ_MACH_O_FILE_PROP_MAX | |
945 | } obj_mach_o_file_properties; | |
946 | ||
947 | static void | |
948 | obj_mach_o_fileprop (int prop) | |
74a6005f | 949 | { |
0c9ef0f0 TG |
950 | if (prop < 0 || prop >= OBJ_MACH_O_FILE_PROP_MAX) |
951 | as_fatal (_("internal error: bad file property ID %d"), prop); | |
952 | ||
953 | switch ((obj_mach_o_file_properties) prop) | |
954 | { | |
955 | case OBJ_MACH_O_FILE_PROP_SUBSECTS_VIA_SYMS: | |
499963bc | 956 | obj_mach_o_subsections_by_symbols = 1; |
0c9ef0f0 TG |
957 | if (!bfd_set_private_flags (stdoutput, |
958 | BFD_MACH_O_MH_SUBSECTIONS_VIA_SYMBOLS)) | |
959 | as_bad (_("failed to set subsections by symbols")); | |
960 | demand_empty_rest_of_line (); | |
961 | break; | |
962 | default: | |
963 | break; | |
964 | } | |
74a6005f TG |
965 | } |
966 | ||
b22161d6 IS |
967 | /* Temporary markers for symbol reference data. |
968 | Lazy will remain in place. */ | |
969 | #define LAZY 0x01 | |
970 | #define REFE 0x02 | |
971 | ||
972 | /* We have a bunch of qualifiers that may be applied to symbols. | |
973 | .globl is handled here so that we might make sure that conflicting qualifiers | |
974 | are caught where possible. */ | |
975 | ||
976 | typedef enum obj_mach_o_symbol_type { | |
977 | OBJ_MACH_O_SYM_UNK = 0, | |
978 | OBJ_MACH_O_SYM_LOCAL = 1, | |
979 | OBJ_MACH_O_SYM_GLOBL = 2, | |
980 | OBJ_MACH_O_SYM_REFERENCE = 3, | |
981 | OBJ_MACH_O_SYM_WEAK_REF = 4, | |
982 | OBJ_MACH_O_SYM_LAZY_REF = 5, | |
983 | OBJ_MACH_O_SYM_WEAK_DEF = 6, | |
984 | OBJ_MACH_O_SYM_PRIV_EXT = 7, | |
985 | OBJ_MACH_O_SYM_NO_DEAD_STRIP = 8, | |
986 | OBJ_MACH_O_SYM_WEAK = 9 | |
987 | } obj_mach_o_symbol_type; | |
988 | ||
989 | /* Set Mach-O-specific symbol qualifiers. */ | |
990 | ||
991 | static int | |
992 | obj_mach_o_set_symbol_qualifier (symbolS *sym, int type) | |
993 | { | |
994 | int is_defined; | |
995 | bfd_mach_o_asymbol *s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (sym); | |
996 | bfd_mach_o_section *sec; | |
997 | int sectype = -1; | |
998 | int err = 0; | |
999 | ||
1000 | /* If the symbol is defined, then we can do more rigorous checking on | |
1001 | the validity of the qualifiers. Otherwise, we are stuck with waiting | |
1002 | until it's defined - or until write the file. | |
1003 | ||
1004 | In certain cases (e.g. when a symbol qualifier is intended to introduce | |
1005 | an undefined symbol in a stubs section) we should check that the current | |
1006 | section is appropriate to the qualifier. */ | |
1007 | ||
1008 | is_defined = s->symbol.section != bfd_und_section_ptr; | |
1009 | if (is_defined) | |
1010 | sec = bfd_mach_o_get_mach_o_section (s->symbol.section) ; | |
1011 | else | |
1012 | sec = bfd_mach_o_get_mach_o_section (now_seg) ; | |
1013 | ||
1014 | if (sec != NULL) | |
1015 | sectype = sec->flags & BFD_MACH_O_SECTION_TYPE_MASK; | |
1016 | ||
1017 | switch ((obj_mach_o_symbol_type) type) | |
1018 | { | |
1019 | case OBJ_MACH_O_SYM_LOCAL: | |
1020 | /* This is an extension over the system tools. */ | |
1021 | if (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT)) | |
1022 | { | |
1023 | as_bad (_("'%s' previously declared as '%s'."), s->symbol.name, | |
1024 | (s->n_type & BFD_MACH_O_N_PEXT) ? "private extern" | |
1025 | : "global" ); | |
1026 | err = 1; | |
1027 | } | |
1028 | else | |
1029 | { | |
1030 | s->n_type &= ~BFD_MACH_O_N_EXT; | |
1031 | S_CLEAR_EXTERNAL (sym); | |
1032 | } | |
1033 | break; | |
1034 | ||
1035 | case OBJ_MACH_O_SYM_PRIV_EXT: | |
1036 | s->n_type |= BFD_MACH_O_N_PEXT ; | |
50d10658 | 1037 | s->n_desc &= ~LAZY; /* The native tool switches this off too. */ |
b22161d6 IS |
1038 | /* We follow the system tools in marking PEXT as also global. */ |
1039 | /* Fall through. */ | |
1040 | ||
1041 | case OBJ_MACH_O_SYM_GLOBL: | |
1042 | /* It's not an error to define a symbol and then make it global. */ | |
1043 | s->n_type |= BFD_MACH_O_N_EXT; | |
1044 | S_SET_EXTERNAL (sym); | |
1045 | break; | |
1046 | ||
1047 | case OBJ_MACH_O_SYM_REFERENCE: | |
1048 | if (is_defined) | |
1049 | s->n_desc |= BFD_MACH_O_N_NO_DEAD_STRIP; | |
1050 | else | |
1051 | s->n_desc |= (REFE | BFD_MACH_O_N_NO_DEAD_STRIP); | |
1052 | break; | |
1053 | ||
1054 | case OBJ_MACH_O_SYM_LAZY_REF: | |
1055 | if (is_defined) | |
1056 | s->n_desc |= BFD_MACH_O_N_NO_DEAD_STRIP; | |
1057 | else | |
1058 | s->n_desc |= (REFE | LAZY | BFD_MACH_O_N_NO_DEAD_STRIP); | |
1059 | break; | |
1060 | ||
1061 | /* Force ld to retain the symbol - even if it appears unused. */ | |
1062 | case OBJ_MACH_O_SYM_NO_DEAD_STRIP: | |
1063 | s->n_desc |= BFD_MACH_O_N_NO_DEAD_STRIP ; | |
1064 | break; | |
1065 | ||
1066 | /* Mach-O's idea of weak ... */ | |
1067 | case OBJ_MACH_O_SYM_WEAK_REF: | |
1068 | s->n_desc |= BFD_MACH_O_N_WEAK_REF ; | |
1069 | break; | |
1070 | ||
1071 | case OBJ_MACH_O_SYM_WEAK_DEF: | |
1072 | if (is_defined && sectype != BFD_MACH_O_S_COALESCED) | |
1073 | { | |
1074 | as_bad (_("'%s' can't be a weak_definition (currently only" | |
1075 | " supported in sections of type coalesced)"), | |
1076 | s->symbol.name); | |
1077 | err = 1; | |
1078 | } | |
1079 | else | |
1080 | s->n_desc |= BFD_MACH_O_N_WEAK_DEF; | |
1081 | break; | |
1082 | ||
1083 | case OBJ_MACH_O_SYM_WEAK: | |
1084 | /* A generic 'weak' - we try to figure out what it means at | |
1085 | symbol frob time. */ | |
1086 | S_SET_WEAK (sym); | |
1087 | break; | |
1088 | ||
1089 | default: | |
1090 | break; | |
1091 | } | |
1092 | ||
1093 | /* We've seen some kind of qualifier - check validity if or when the entity | |
1094 | is defined. */ | |
1095 | s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; | |
1096 | return err; | |
1097 | } | |
1098 | ||
1099 | /* Respond to symbol qualifiers. | |
1100 | All of the form: | |
1101 | .<qualifier> symbol [, symbol]* | |
1102 | a list of symbols is an extension over the Darwin system as. */ | |
1103 | ||
1104 | static void | |
1105 | obj_mach_o_sym_qual (int ntype) | |
1106 | { | |
1107 | char *name; | |
1108 | char c; | |
1109 | symbolS *symbolP; | |
1110 | ||
1111 | #ifdef md_flush_pending_output | |
1112 | md_flush_pending_output (); | |
1113 | #endif | |
1114 | ||
1115 | do | |
1116 | { | |
1117 | name = input_line_pointer; | |
1118 | c = get_symbol_end (); | |
1119 | symbolP = symbol_find_or_make (name); | |
1120 | obj_mach_o_set_symbol_qualifier (symbolP, ntype); | |
1121 | *input_line_pointer = c; | |
1122 | SKIP_WHITESPACE (); | |
1123 | c = *input_line_pointer; | |
1124 | if (c == ',') | |
1125 | { | |
1126 | input_line_pointer++; | |
1127 | SKIP_WHITESPACE (); | |
1128 | if (is_end_of_line[(unsigned char) *input_line_pointer]) | |
1129 | c = '\n'; | |
1130 | } | |
1131 | } | |
1132 | while (c == ','); | |
1133 | ||
1134 | demand_empty_rest_of_line (); | |
1135 | } | |
1136 | ||
50d10658 IS |
1137 | typedef struct obj_mach_o_indirect_sym |
1138 | { | |
1139 | symbolS *sym; | |
1140 | segT sect; | |
1141 | struct obj_mach_o_indirect_sym *next; | |
1142 | } obj_mach_o_indirect_sym; | |
1143 | ||
1144 | /* We store in order an maintain a pointer to the last one - to save reversing | |
1145 | later. */ | |
1146 | obj_mach_o_indirect_sym *indirect_syms; | |
1147 | obj_mach_o_indirect_sym *indirect_syms_tail; | |
a4551119 TG |
1148 | |
1149 | static void | |
50d10658 | 1150 | obj_mach_o_indirect_symbol (int arg ATTRIBUTE_UNUSED) |
a4551119 | 1151 | { |
50d10658 IS |
1152 | bfd_mach_o_section *sec = bfd_mach_o_get_mach_o_section (now_seg); |
1153 | ||
1154 | #ifdef md_flush_pending_output | |
1155 | md_flush_pending_output (); | |
1156 | #endif | |
1157 | ||
1158 | if (obj_mach_o_is_static) | |
1159 | as_bad (_("use of .indirect_symbols requires `-dynamic'")); | |
1160 | ||
1161 | switch (sec->flags & BFD_MACH_O_SECTION_TYPE_MASK) | |
1162 | { | |
1163 | case BFD_MACH_O_S_SYMBOL_STUBS: | |
1164 | case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS: | |
1165 | case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS: | |
1166 | { | |
1167 | obj_mach_o_indirect_sym *isym; | |
1168 | char *name = input_line_pointer; | |
1169 | char c = get_symbol_end (); | |
1170 | symbolS *sym = symbol_find_or_make (name); | |
1171 | unsigned int elsize = | |
1172 | bfd_mach_o_section_get_entry_size (stdoutput, sec); | |
1173 | ||
1174 | if (elsize == 0) | |
1175 | { | |
1176 | as_bad (_("attempt to add an indirect_symbol to a stub or" | |
1177 | " reference section with a zero-sized element at %s"), | |
1178 | name); | |
1179 | *input_line_pointer = c; | |
1180 | ignore_rest_of_line (); | |
1181 | return; | |
1182 | } | |
1183 | *input_line_pointer = c; | |
1184 | ||
1185 | isym = (obj_mach_o_indirect_sym *) | |
1186 | xmalloc (sizeof (obj_mach_o_indirect_sym)); | |
1187 | ||
1188 | /* Just record the data for now, we will validate it when we | |
1189 | compute the output in obj_mach_o_set_indirect_symbols. */ | |
1190 | isym->sym = sym; | |
1191 | isym->sect = now_seg; | |
1192 | isym->next = NULL; | |
1193 | if (indirect_syms == NULL) | |
1194 | indirect_syms = isym; | |
1195 | else | |
1196 | indirect_syms_tail->next = isym; | |
1197 | indirect_syms_tail = isym; | |
1198 | } | |
1199 | break; | |
1200 | ||
1201 | default: | |
1202 | as_bad (_("an .indirect_symbol must be in a symbol pointer" | |
1203 | " or stub section.")); | |
1204 | ignore_rest_of_line (); | |
1205 | return; | |
1206 | } | |
1207 | demand_empty_rest_of_line (); | |
a4551119 TG |
1208 | } |
1209 | ||
e57f8c65 TG |
1210 | const pseudo_typeS mach_o_pseudo_table[] = |
1211 | { | |
a4551119 | 1212 | /* Section directives. */ |
74a6005f | 1213 | { "comm", obj_mach_o_comm, 0 }, |
a4551119 TG |
1214 | { "lcomm", obj_mach_o_comm, 1 }, |
1215 | ||
1216 | { "text", obj_mach_o_base_section, 1}, | |
1217 | { "data", obj_mach_o_base_section, 2}, | |
1218 | { "bss", obj_mach_o_base_section, 3}, /* extension */ | |
1219 | ||
1220 | { "const", obj_mach_o_known_section, 1}, | |
1221 | { "static_const", obj_mach_o_known_section, 2}, | |
1222 | { "cstring", obj_mach_o_known_section, 3}, | |
1223 | { "literal4", obj_mach_o_known_section, 4}, | |
1224 | { "literal8", obj_mach_o_known_section, 5}, | |
1225 | { "literal16", obj_mach_o_known_section, 6}, | |
1226 | { "constructor", obj_mach_o_known_section, 7}, | |
1227 | { "destructor", obj_mach_o_known_section, 8}, | |
1228 | { "eh_frame", obj_mach_o_known_section, 9}, | |
1229 | ||
1230 | { "const_data", obj_mach_o_known_section, 10}, | |
1231 | { "static_data", obj_mach_o_known_section, 11}, | |
1232 | { "mod_init_func", obj_mach_o_known_section, 12}, | |
1233 | { "mod_term_func", obj_mach_o_known_section, 13}, | |
1234 | { "dyld", obj_mach_o_known_section, 14}, | |
1235 | { "cfstring", obj_mach_o_known_section, 15}, | |
1236 | ||
1237 | { "objc_class", obj_mach_o_objc_section, 1}, | |
1238 | { "objc_meta_class", obj_mach_o_objc_section, 2}, | |
1239 | { "objc_cat_cls_meth", obj_mach_o_objc_section, 3}, | |
1240 | { "objc_cat_inst_meth", obj_mach_o_objc_section, 4}, | |
1241 | { "objc_protocol", obj_mach_o_objc_section, 5}, | |
1242 | { "objc_string_object", obj_mach_o_objc_section, 6}, | |
1243 | { "objc_cls_meth", obj_mach_o_objc_section, 7}, | |
1244 | { "objc_inst_meth", obj_mach_o_objc_section, 8}, | |
1245 | { "objc_cls_refs", obj_mach_o_objc_section, 9}, | |
1246 | { "objc_message_refs", obj_mach_o_objc_section, 10}, | |
1247 | { "objc_symbols", obj_mach_o_objc_section, 11}, | |
1248 | { "objc_category", obj_mach_o_objc_section, 12}, | |
1249 | { "objc_class_vars", obj_mach_o_objc_section, 13}, | |
1250 | { "objc_instance_vars", obj_mach_o_objc_section, 14}, | |
1251 | { "objc_module_info", obj_mach_o_objc_section, 15}, | |
1252 | { "objc_class_names", obj_mach_o_objc_section, 16}, /* Alias for .cstring */ | |
1253 | { "objc_meth_var_types", obj_mach_o_objc_section, 17}, /* Alias for .cstring */ | |
1254 | { "objc_meth_var_names", obj_mach_o_objc_section, 18}, /* Alias for .cstring */ | |
1255 | { "objc_selector_strs", obj_mach_o_objc_section, 19}, | |
1256 | { "objc_image_info", obj_mach_o_objc_section, 20}, /* extension. */ | |
1257 | { "objc_selector_fixup", obj_mach_o_objc_section, 21}, /* extension. */ | |
1258 | { "objc1_class_ext", obj_mach_o_objc_section, 22}, /* ObjC-1 extension. */ | |
1259 | { "objc1_property_list", obj_mach_o_objc_section, 23}, /* ObjC-1 extension. */ | |
1260 | { "objc1_protocol_ext", obj_mach_o_objc_section, 24}, /* ObjC-1 extension. */ | |
1261 | ||
1262 | { "debug_frame", obj_mach_o_debug_section, 1}, /* extension. */ | |
1263 | { "debug_info", obj_mach_o_debug_section, 2}, /* extension. */ | |
1264 | { "debug_abbrev", obj_mach_o_debug_section, 3}, /* extension. */ | |
1265 | { "debug_aranges", obj_mach_o_debug_section, 4}, /* extension. */ | |
1266 | { "debug_macinfo", obj_mach_o_debug_section, 5}, /* extension. */ | |
1267 | { "debug_line", obj_mach_o_debug_section, 6}, /* extension. */ | |
1268 | { "debug_loc", obj_mach_o_debug_section, 7}, /* extension. */ | |
1269 | { "debug_pubnames", obj_mach_o_debug_section, 8}, /* extension. */ | |
1270 | { "debug_pubtypes", obj_mach_o_debug_section, 9}, /* extension. */ | |
1271 | { "debug_str", obj_mach_o_debug_section, 10}, /* extension. */ | |
1272 | { "debug_ranges", obj_mach_o_debug_section, 11}, /* extension. */ | |
1273 | { "debug_macro", obj_mach_o_debug_section, 12}, /* extension. */ | |
1274 | ||
1275 | { "lazy_symbol_pointer", obj_mach_o_opt_tgt_section, 1}, | |
1276 | { "lazy_symbol_pointer2", obj_mach_o_opt_tgt_section, 2}, /* extension. */ | |
1277 | { "lazy_symbol_pointer3", obj_mach_o_opt_tgt_section, 3}, /* extension. */ | |
1278 | { "non_lazy_symbol_pointer", obj_mach_o_opt_tgt_section, 4}, | |
1279 | { "non_lazy_symbol_pointer_x86", obj_mach_o_opt_tgt_section, 5}, /* extension. */ | |
1280 | { "symbol_stub", obj_mach_o_opt_tgt_section, 6}, | |
1281 | { "symbol_stub1", obj_mach_o_opt_tgt_section, 7}, /* extension. */ | |
1282 | { "picsymbol_stub", obj_mach_o_opt_tgt_section, 8}, /* extension. */ | |
1283 | { "picsymbol_stub1", obj_mach_o_opt_tgt_section, 9}, /* extension. */ | |
1284 | { "picsymbol_stub2", obj_mach_o_opt_tgt_section, 4}, /* extension. */ | |
1285 | { "picsymbol_stub3", obj_mach_o_opt_tgt_section, 4}, /* extension. */ | |
1286 | ||
1287 | { "section", obj_mach_o_section, 0}, | |
8cf6e084 | 1288 | { "zerofill", obj_mach_o_zerofill, 0}, |
a4551119 | 1289 | |
b22161d6 IS |
1290 | /* Symbol qualifiers. */ |
1291 | {"local", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_LOCAL}, | |
1292 | {"globl", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_GLOBL}, | |
1293 | {"reference", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_REFERENCE}, | |
1294 | {"weak_reference", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_WEAK_REF}, | |
1295 | {"lazy_reference", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_LAZY_REF}, | |
1296 | {"weak_definition", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_WEAK_DEF}, | |
1297 | {"private_extern", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_PRIV_EXT}, | |
1298 | {"no_dead_strip", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_NO_DEAD_STRIP}, | |
1299 | {"weak", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_WEAK}, /* ext */ | |
1300 | ||
50d10658 | 1301 | { "indirect_symbol", obj_mach_o_indirect_symbol, 0}, |
a4551119 TG |
1302 | |
1303 | /* File flags. */ | |
0c9ef0f0 TG |
1304 | { "subsections_via_symbols", obj_mach_o_fileprop, |
1305 | OBJ_MACH_O_FILE_PROP_SUBSECTS_VIA_SYMS}, | |
e57f8c65 TG |
1306 | |
1307 | {NULL, NULL, 0} | |
1308 | }; | |
68588f95 | 1309 | |
b22161d6 IS |
1310 | /* Determine the default n_type value for a symbol from its section. */ |
1311 | ||
1312 | static unsigned | |
1313 | obj_mach_o_type_for_symbol (bfd_mach_o_asymbol *s) | |
1314 | { | |
1315 | if (s->symbol.section == bfd_abs_section_ptr) | |
1316 | return BFD_MACH_O_N_ABS; | |
1317 | else if (s->symbol.section == bfd_com_section_ptr | |
1318 | || s->symbol.section == bfd_und_section_ptr) | |
1319 | return BFD_MACH_O_N_UNDF; | |
1320 | else | |
1321 | return BFD_MACH_O_N_SECT; | |
1322 | } | |
1323 | ||
1324 | /* We need to check the correspondence between some kinds of symbols and their | |
1325 | sections. Common and BSS vars will seen via the obj_macho_comm() function. | |
1326 | ||
1327 | The earlier we can pick up a problem, the better the diagnostics will be. | |
1328 | ||
1329 | However, when symbol type information is attached, the symbol section will | |
1330 | quite possibly be unknown. So we are stuck with checking (most of the) | |
1331 | validity at the time the file is written (unfortunately, then one doesn't | |
1332 | get line number information in the diagnostic). */ | |
1333 | ||
1334 | /* Here we pick up the case where symbol qualifiers have been applied that | |
1335 | are possibly incompatible with the section etc. that the symbol is defined | |
1336 | in. */ | |
1337 | ||
1338 | void obj_macho_frob_label (struct symbol *sp) | |
1339 | { | |
50d10658 IS |
1340 | bfd_mach_o_asymbol *s; |
1341 | unsigned base_type; | |
1342 | bfd_mach_o_section *sec; | |
b22161d6 IS |
1343 | int sectype = -1; |
1344 | ||
50d10658 IS |
1345 | /* Leave local symbols alone. */ |
1346 | ||
1347 | if (S_IS_LOCAL (sp)) | |
1348 | return; | |
1349 | ||
1350 | s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (sp); | |
1351 | /* Leave debug symbols alone. */ | |
b22161d6 | 1352 | if ((s->n_type & BFD_MACH_O_N_STAB) != 0) |
50d10658 IS |
1353 | return; |
1354 | ||
1355 | /* This is the base symbol type, that we mask in. */ | |
1356 | base_type = obj_mach_o_type_for_symbol (s); | |
1357 | ||
1358 | sec = bfd_mach_o_get_mach_o_section (s->symbol.section); | |
b22161d6 IS |
1359 | if (sec != NULL) |
1360 | sectype = sec->flags & BFD_MACH_O_SECTION_TYPE_MASK; | |
1361 | ||
1362 | /* If there is a pre-existing qualifier, we can make some checks about | |
1363 | validity now. */ | |
1364 | ||
1365 | if(s->symbol.udata.i == SYM_MACHO_FIELDS_NOT_VALIDATED) | |
1366 | { | |
1367 | if ((s->n_desc & BFD_MACH_O_N_WEAK_DEF) | |
1368 | && sectype != BFD_MACH_O_S_COALESCED) | |
1369 | as_bad (_("'%s' can't be a weak_definition (currently only supported" | |
1370 | " in sections of type coalesced)"), s->symbol.name); | |
1371 | ||
1372 | /* Have we changed from an undefined to defined ref? */ | |
1373 | s->n_desc &= ~(REFE | LAZY); | |
1374 | } | |
1375 | ||
1376 | s->n_type &= ~BFD_MACH_O_N_TYPE; | |
1377 | s->n_type |= base_type; | |
1378 | } | |
1379 | ||
1380 | /* This is the fall-back, we come here when we get to the end of the file and | |
1381 | the symbol is not defined - or there are combinations of qualifiers required | |
1382 | (e.g. global + weak_def). */ | |
1383 | ||
1384 | int | |
1385 | obj_macho_frob_symbol (struct symbol *sp) | |
1386 | { | |
50d10658 IS |
1387 | bfd_mach_o_asymbol *s; |
1388 | unsigned base_type; | |
1389 | bfd_mach_o_section *sec; | |
b22161d6 | 1390 | int sectype = -1; |
50d10658 IS |
1391 | |
1392 | /* Leave local symbols alone. */ | |
1393 | if (S_IS_LOCAL (sp)) | |
1394 | return 0; | |
1395 | ||
1396 | s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (sp); | |
1397 | /* Leave debug symbols alone. */ | |
1398 | if ((s->n_type & BFD_MACH_O_N_STAB) != 0) | |
1399 | return 0; | |
1400 | ||
1401 | base_type = obj_mach_o_type_for_symbol (s); | |
1402 | sec = bfd_mach_o_get_mach_o_section (s->symbol.section); | |
b22161d6 IS |
1403 | if (sec != NULL) |
1404 | sectype = sec->flags & BFD_MACH_O_SECTION_TYPE_MASK; | |
1405 | ||
50d10658 | 1406 | if (s->symbol.section == bfd_und_section_ptr) |
b22161d6 IS |
1407 | { |
1408 | /* ??? Do we really gain much from implementing this as well as the | |
1409 | mach-o specific ones? */ | |
1410 | if (s->symbol.flags & BSF_WEAK) | |
1411 | s->n_desc |= BFD_MACH_O_N_WEAK_REF; | |
1412 | ||
50d10658 IS |
1413 | /* Undefined syms, become extern. */ |
1414 | s->n_type |= BFD_MACH_O_N_EXT; | |
1415 | S_SET_EXTERNAL (sp); | |
1416 | } | |
1417 | else if (s->symbol.section == bfd_com_section_ptr) | |
1418 | { | |
1419 | /* ... so do comm. */ | |
1420 | s->n_type |= BFD_MACH_O_N_EXT; | |
1421 | S_SET_EXTERNAL (sp); | |
b22161d6 IS |
1422 | } |
1423 | else | |
1424 | { | |
1425 | if ((s->symbol.flags & BSF_WEAK) | |
1426 | && (sectype == BFD_MACH_O_S_COALESCED) | |
1427 | && (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT))) | |
1428 | s->n_desc |= BFD_MACH_O_N_WEAK_DEF; | |
1429 | /* ??? we should do this - but then that reveals that the semantics of weak | |
1430 | are different from what's supported in mach-o object files. | |
1431 | else | |
1432 | as_bad (_("'%s' can't be a weak_definition."), | |
1433 | s->symbol.name); */ | |
1434 | } | |
1435 | ||
1436 | if (s->symbol.udata.i == SYM_MACHO_FIELDS_UNSET) | |
1437 | { | |
1438 | /* Anything here that should be added that is non-standard. */ | |
1439 | s->n_desc &= ~BFD_MACH_O_REFERENCE_MASK; | |
50d10658 | 1440 | s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; |
b22161d6 IS |
1441 | } |
1442 | else if (s->symbol.udata.i == SYM_MACHO_FIELDS_NOT_VALIDATED) | |
1443 | { | |
1444 | /* Try to validate any combinations. */ | |
1445 | if (s->n_desc & BFD_MACH_O_N_WEAK_DEF) | |
1446 | { | |
1447 | if (s->symbol.section == bfd_und_section_ptr) | |
1448 | as_bad (_("'%s' can't be a weak_definition (since it is" | |
1449 | " undefined)"), s->symbol.name); | |
1450 | else if (sectype != BFD_MACH_O_S_COALESCED) | |
1451 | as_bad (_("'%s' can't be a weak_definition (currently only supported" | |
1452 | " in sections of type coalesced)"), s->symbol.name); | |
1453 | else if (! (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT))) | |
1454 | as_bad (_("Non-global symbol: '%s' can't be a weak_definition."), | |
1455 | s->symbol.name); | |
1456 | } | |
1457 | ||
1458 | } | |
1459 | else | |
1460 | as_bad (_("internal error: [%s] unexpected code [%lx] in frob symbol"), | |
1461 | s->symbol.name, (unsigned long)s->symbol.udata.i); | |
1462 | ||
1463 | s->n_type &= ~BFD_MACH_O_N_TYPE; | |
1464 | s->n_type |= base_type; | |
1465 | ||
1466 | if (s->symbol.flags & BSF_GLOBAL) | |
1467 | s->n_type |= BFD_MACH_O_N_EXT; | |
1468 | ||
1469 | /* This cuts both ways - we promote some things to external above. */ | |
1470 | if (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT)) | |
1471 | S_SET_EXTERNAL (sp); | |
1472 | ||
1473 | return 0; | |
1474 | } | |
1475 | ||
c3402d20 IS |
1476 | /* Zerofill and GB Zerofill sections must be sorted to follow all other |
1477 | sections in their segments. | |
1478 | ||
1479 | The native 'as' leaves the sections physically in the order they appear in | |
1480 | the source, and adjusts the section VMAs to meet the constraint. | |
1481 | ||
1482 | We follow this for now - if nothing else, it makes comparison easier. | |
1483 | ||
1484 | An alternative implementation would be to sort the sections as ld requires. | |
1485 | It might be advantageous to implement such a scheme in the future (or even | |
1486 | to make the style of section ordering user-selectable). */ | |
1487 | ||
1488 | typedef struct obj_mach_o_set_vma_data | |
1489 | { | |
1490 | bfd_vma vma; | |
1491 | unsigned vma_pass; | |
1492 | unsigned zerofill_seen; | |
1493 | unsigned gb_zerofill_seen; | |
1494 | } obj_mach_o_set_vma_data; | |
1495 | ||
1496 | /* We do (possibly) three passes through to set the vma, so that: | |
1497 | ||
1498 | zerofill sections get VMAs after all others in their segment | |
1499 | GB zerofill get VMAs last. | |
1500 | ||
1501 | As we go, we notice if we see any Zerofill or GB Zerofill sections, so that | |
1502 | we can skip the additional passes if there's nothing to do. */ | |
1503 | ||
1504 | static void | |
1505 | obj_mach_o_set_section_vma (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *v_p) | |
1506 | { | |
1507 | bfd_mach_o_section *ms = bfd_mach_o_get_mach_o_section (sec); | |
1508 | unsigned bfd_align = bfd_get_section_alignment (abfd, sec); | |
1509 | obj_mach_o_set_vma_data *p = (struct obj_mach_o_set_vma_data *)v_p; | |
1510 | unsigned sectype = (ms->flags & BFD_MACH_O_SECTION_TYPE_MASK); | |
1511 | unsigned zf; | |
1512 | ||
1513 | zf = 0; | |
1514 | if (sectype == BFD_MACH_O_S_ZEROFILL) | |
1515 | { | |
1516 | zf = 1; | |
1517 | p->zerofill_seen = zf; | |
1518 | } | |
1519 | else if (sectype == BFD_MACH_O_S_GB_ZEROFILL) | |
1520 | { | |
1521 | zf = 2; | |
1522 | p->gb_zerofill_seen = zf; | |
1523 | } | |
1524 | ||
1525 | if (p->vma_pass != zf) | |
1526 | return; | |
1527 | ||
1528 | /* We know the section size now - so make a vma for the section just | |
1529 | based on order. */ | |
1530 | ms->size = bfd_get_section_size (sec); | |
1531 | ||
1532 | /* Make sure that the align agrees, and set to the largest value chosen. */ | |
1533 | ms->align = ms->align > bfd_align ? ms->align : bfd_align; | |
1534 | bfd_set_section_alignment (abfd, sec, ms->align); | |
1535 | ||
1536 | p->vma += (1 << ms->align) - 1; | |
1537 | p->vma &= ~((1 << ms->align) - 1); | |
1538 | ms->addr = p->vma; | |
1539 | bfd_set_section_vma (abfd, sec, p->vma); | |
1540 | p->vma += ms->size; | |
1541 | } | |
1542 | ||
1543 | /* (potentially) three passes over the sections, setting VMA. We skip the | |
1544 | {gb}zerofill passes if we didn't see any of the relevant sections. */ | |
1545 | ||
1546 | void obj_mach_o_post_relax_hook (void) | |
1547 | { | |
1548 | obj_mach_o_set_vma_data d; | |
1549 | ||
1550 | memset (&d, 0, sizeof (d)); | |
1551 | ||
1552 | bfd_map_over_sections (stdoutput, obj_mach_o_set_section_vma, (char *) &d); | |
1553 | if ((d.vma_pass = d.zerofill_seen) != 0) | |
1554 | bfd_map_over_sections (stdoutput, obj_mach_o_set_section_vma, (char *) &d); | |
1555 | if ((d.vma_pass = d.gb_zerofill_seen) != 0) | |
1556 | bfd_map_over_sections (stdoutput, obj_mach_o_set_section_vma, (char *) &d); | |
1557 | } | |
1558 | ||
50d10658 IS |
1559 | static void |
1560 | obj_mach_o_set_indirect_symbols (bfd *abfd, asection *sec, | |
1561 | void *xxx ATTRIBUTE_UNUSED) | |
1562 | { | |
1563 | bfd_vma sect_size = bfd_section_size (abfd, sec); | |
1564 | bfd_mach_o_section *ms = bfd_mach_o_get_mach_o_section (sec); | |
1565 | unsigned lazy = 0; | |
1566 | ||
1567 | /* See if we have any indirect syms to consider. */ | |
1568 | if (indirect_syms == NULL) | |
1569 | return; | |
1570 | ||
1571 | /* Process indirect symbols. | |
1572 | Check for errors, if OK attach them as a flat array to the section | |
1573 | for which they are defined. */ | |
1574 | ||
1575 | switch (ms->flags & BFD_MACH_O_SECTION_TYPE_MASK) | |
1576 | { | |
1577 | case BFD_MACH_O_S_SYMBOL_STUBS: | |
1578 | case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS: | |
1579 | lazy = LAZY; | |
1580 | /* Fall through. */ | |
1581 | case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS: | |
1582 | { | |
1583 | unsigned int nactual = 0; | |
1584 | unsigned int ncalc; | |
1585 | obj_mach_o_indirect_sym *isym; | |
1586 | obj_mach_o_indirect_sym *list = NULL; | |
1587 | obj_mach_o_indirect_sym *list_tail = NULL; | |
1588 | unsigned long eltsiz = | |
1589 | bfd_mach_o_section_get_entry_size (abfd, ms); | |
1590 | ||
1591 | for (isym = indirect_syms; isym != NULL; isym = isym->next) | |
1592 | { | |
1593 | if (isym->sect == sec) | |
1594 | { | |
1595 | nactual++; | |
1596 | if (list == NULL) | |
1597 | list = isym; | |
1598 | else | |
1599 | list_tail->next = isym; | |
1600 | list_tail = isym; | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | /* If none are in this section, stop here. */ | |
1605 | if (nactual == 0) | |
1606 | break; | |
1607 | ||
1608 | /* If we somehow added indirect symbols to a section with a zero | |
1609 | entry size, we're dead ... */ | |
1610 | gas_assert (eltsiz != 0); | |
1611 | ||
1612 | ncalc = (unsigned int) (sect_size / eltsiz); | |
1613 | if (nactual != ncalc) | |
1614 | as_bad (_("the number of .indirect_symbols defined in section %s" | |
1615 | " does not match the number expected (%d defined, %d" | |
1616 | " expected)"), sec->name, nactual, ncalc); | |
1617 | else | |
1618 | { | |
1619 | unsigned n; | |
1620 | bfd_mach_o_asymbol *sym; | |
1621 | ms->indirect_syms = | |
1622 | bfd_zalloc (abfd, | |
1623 | nactual * sizeof (bfd_mach_o_asymbol *)); | |
1624 | ||
1625 | if (ms->indirect_syms == NULL) | |
1626 | { | |
1627 | as_fatal (_("internal error: failed to allocate %d indirect" | |
1628 | "symbol pointers"), nactual); | |
1629 | } | |
1630 | ||
1631 | for (isym = list, n = 0; isym != NULL; isym = isym->next, n++) | |
1632 | { | |
687be931 | 1633 | sym = (bfd_mach_o_asymbol *)symbol_get_bfdsym (isym->sym); |
50d10658 IS |
1634 | /* Array is init to NULL & NULL signals a local symbol |
1635 | If the section is lazy-bound, we need to keep the | |
687be931 IS |
1636 | reference to the symbol, since dyld can override. |
1637 | ||
1638 | Absolute symbols are handled specially. */ | |
1639 | if (sym->symbol.section == bfd_abs_section_ptr) | |
1640 | ms->indirect_syms[n] = sym; | |
1641 | else if (S_IS_LOCAL (isym->sym) && ! lazy) | |
50d10658 IS |
1642 | ; |
1643 | else | |
1644 | { | |
50d10658 IS |
1645 | if (sym == NULL) |
1646 | ; | |
1647 | /* If the symbols is external ... */ | |
1648 | else if (S_IS_EXTERNAL (isym->sym) | |
1649 | || (sym->n_type & BFD_MACH_O_N_EXT) | |
1650 | || ! S_IS_DEFINED (isym->sym) | |
1651 | || lazy) | |
1652 | { | |
1653 | sym->n_desc &= ~LAZY; | |
1654 | /* ... it can be lazy, if not defined or hidden. */ | |
1655 | if ((sym->n_type & BFD_MACH_O_N_TYPE) | |
1656 | == BFD_MACH_O_N_UNDF | |
1657 | && ! (sym->n_type & BFD_MACH_O_N_PEXT) | |
1658 | && (sym->n_type & BFD_MACH_O_N_EXT)) | |
1659 | sym->n_desc |= lazy; | |
1660 | ms->indirect_syms[n] = sym; | |
1661 | } | |
1662 | } | |
1663 | } | |
1664 | } | |
1665 | } | |
1666 | break; | |
1667 | ||
1668 | default: | |
1669 | break; | |
1670 | } | |
1671 | } | |
1672 | ||
1673 | /* The process of relocation could alter what's externally visible, thus we | |
1674 | leave setting the indirect symbols until last. */ | |
1675 | ||
1676 | void | |
1677 | obj_mach_o_frob_file_after_relocs (void) | |
1678 | { | |
1679 | bfd_map_over_sections (stdoutput, obj_mach_o_set_indirect_symbols, (char *) 0); | |
1680 | } | |
1681 | ||
34dd18bc IS |
1682 | /* Reverse relocations order to make ld happy. */ |
1683 | ||
1684 | void | |
1685 | obj_mach_o_reorder_section_relocs (asection *sec, arelent **rels, unsigned int n) | |
1686 | { | |
1687 | unsigned int i; | |
1688 | unsigned int max = n / 2; | |
1689 | ||
1690 | for (i = 0; i < max; i++) | |
1691 | { | |
1692 | arelent *r = rels[i]; | |
1693 | rels[i] = rels[n - i - 1]; | |
1694 | rels[n - i - 1] = r; | |
1695 | } | |
1696 | bfd_set_reloc (stdoutput, sec, rels, n); | |
1697 | } | |
1698 | ||
68588f95 IS |
1699 | /* Support stabs for mach-o. */ |
1700 | ||
1701 | void | |
1702 | obj_mach_o_process_stab (int what, const char *string, | |
1703 | int type, int other, int desc) | |
1704 | { | |
1705 | symbolS *symbolP; | |
1706 | bfd_mach_o_asymbol *s; | |
1707 | ||
1708 | switch (what) | |
1709 | { | |
1710 | case 'd': | |
1711 | symbolP = symbol_new ("", now_seg, frag_now_fix (), frag_now); | |
1712 | /* Special stabd NULL name indicator. */ | |
1713 | S_SET_NAME (symbolP, NULL); | |
1714 | break; | |
1715 | ||
1716 | case 'n': | |
1717 | case 's': | |
1718 | symbolP = symbol_new (string, undefined_section, (valueT) 0, | |
1719 | &zero_address_frag); | |
1720 | pseudo_set (symbolP); | |
1721 | break; | |
1722 | ||
1723 | default: | |
1724 | as_bad(_("unrecognized stab type '%c'"), (char)what); | |
1725 | abort (); | |
1726 | break; | |
1727 | } | |
1728 | ||
1729 | s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (symbolP); | |
1730 | s->n_type = type; | |
1731 | s->n_desc = desc; | |
1732 | /* For stabd, this will eventually get overwritten by the section number. */ | |
1733 | s->n_sect = other; | |
1734 | ||
1735 | /* It's a debug symbol. */ | |
1736 | s->symbol.flags |= BSF_DEBUGGING; | |
1737 | } |