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e57f8c65 | 1 | /* Mach-O object file format |
2571583a | 2 | Copyright (C) 2009-2017 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 | |
3739860c | 27 | multiple named sections. Thus the concept of subsectioning is |
a4551119 | 28 | handled by (say) having a __TEXT segment with appropriate flags from |
3739860c L |
29 | which subsections are generated like __text, __const etc. |
30 | ||
a4551119 | 31 | The well-known as short-hand section switch directives like .text, .data |
2b0f3761 | 32 | etc. are mapped onto predefined segment/section pairs using facilities |
a4551119 | 33 | supplied by the mach-o port of bfd. |
3739860c | 34 | |
a4551119 TG |
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. */ | |
cdaa5616 | 59 | |
bcf0aac6 IS |
60 | static int obj_mach_o_start_with_text_section = 1; |
61 | ||
a4551119 TG |
62 | /* Allow for special re-ordering on output. */ |
63 | ||
bcf0aac6 IS |
64 | static int obj_mach_o_seen_objc_section; |
65 | ||
66 | /* Start-up: At present, just create the sections we want. */ | |
67 | void | |
68 | mach_o_begin (void) | |
69 | { | |
70 | /* Mach-O only defines the .text section by default, and even this can | |
71 | be suppressed by a flag. In the latter event, the first code MUST | |
72 | be a section definition. */ | |
73 | if (obj_mach_o_start_with_text_section) | |
74 | { | |
75 | text_section = obj_mach_o_segT_from_bfd_name (TEXT_SECTION_NAME, 1); | |
76 | subseg_set (text_section, 0); | |
77 | if (obj_mach_o_is_static) | |
78 | { | |
3739860c | 79 | bfd_mach_o_section *mo_sec |
bcf0aac6 IS |
80 | = bfd_mach_o_get_mach_o_section (text_section); |
81 | mo_sec->flags &= ~BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS; | |
82 | } | |
83 | } | |
84 | } | |
e57f8c65 | 85 | |
0c9ef0f0 TG |
86 | /* Remember the subsections_by_symbols state in case we need to reset |
87 | the file flags. */ | |
0c9ef0f0 | 88 | |
b22161d6 | 89 | static int obj_mach_o_subsections_by_symbols; |
e57f8c65 | 90 | |
a4551119 TG |
91 | /* This will put at most 16 characters (terminated by a ',' or newline) from |
92 | the input stream into dest. If there are more than 16 chars before the | |
93 | delimiter, a warning is given and the string is truncated. On completion of | |
3739860c L |
94 | this function, input_line_pointer will point to the char after the ',' or |
95 | to the newline. | |
96 | ||
a4551119 TG |
97 | It trims leading and trailing space. */ |
98 | ||
99 | static int | |
100 | collect_16char_name (char *dest, const char *msg, int require_comma) | |
101 | { | |
102 | char c, *namstart; | |
103 | ||
104 | SKIP_WHITESPACE (); | |
105 | namstart = input_line_pointer; | |
106 | ||
3739860c | 107 | while ( (c = *input_line_pointer) != ',' |
a4551119 TG |
108 | && !is_end_of_line[(unsigned char) c]) |
109 | input_line_pointer++; | |
110 | ||
111 | { | |
112 | int len = input_line_pointer - namstart; /* could be zero. */ | |
3739860c L |
113 | /* lose any trailing space. */ |
114 | while (len > 0 && namstart[len-1] == ' ') | |
a4551119 TG |
115 | len--; |
116 | if (len > 16) | |
117 | { | |
118 | *input_line_pointer = '\0'; /* make a temp string. */ | |
119 | as_bad (_("the %s name '%s' is too long (maximum 16 characters)"), | |
120 | msg, namstart); | |
121 | *input_line_pointer = c; /* restore for printing. */ | |
122 | len = 16; | |
123 | } | |
124 | if (len > 0) | |
125 | memcpy (dest, namstart, len); | |
126 | } | |
127 | ||
128 | if (c != ',' && require_comma) | |
129 | { | |
130 | as_bad (_("expected a %s name followed by a `,'"), msg); | |
131 | return 1; | |
132 | } | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
8cf6e084 IS |
137 | static int |
138 | obj_mach_o_get_section_names (char *seg, char *sec, | |
139 | unsigned segl, unsigned secl) | |
140 | { | |
141 | /* Zero-length segment and section names are allowed. */ | |
142 | /* Parse segment name. */ | |
143 | memset (seg, 0, segl); | |
144 | if (collect_16char_name (seg, "segment", 1)) | |
145 | { | |
146 | ignore_rest_of_line (); | |
147 | return 0; | |
148 | } | |
149 | input_line_pointer++; /* Skip the terminating ',' */ | |
150 | ||
151 | /* Parse section name, which can be empty. */ | |
152 | memset (sec, 0, secl); | |
153 | collect_16char_name (sec, "section", 0); | |
154 | return 1; | |
155 | } | |
156 | ||
157 | /* Build (or get) a section from the mach-o description - which includes | |
158 | optional definitions for type, attributes, alignment and stub size. | |
3739860c | 159 | |
8cf6e084 IS |
160 | BFD supplies default values for sections which have a canonical name. */ |
161 | ||
162 | #define SECT_TYPE_SPECIFIED 0x0001 | |
163 | #define SECT_ATTR_SPECIFIED 0x0002 | |
164 | #define SECT_ALGN_SPECIFIED 0x0004 | |
fb4914b0 | 165 | #define SECT_STUB_SPECIFIED 0x0008 |
8cf6e084 IS |
166 | |
167 | static segT | |
168 | obj_mach_o_make_or_get_sect (char * segname, char * sectname, | |
3739860c | 169 | unsigned int specified_mask, |
8cf6e084 IS |
170 | unsigned int usectype, unsigned int usecattr, |
171 | unsigned int ualign, offsetT stub_size) | |
172 | { | |
173 | unsigned int sectype, secattr, secalign; | |
174 | flagword oldflags, flags; | |
175 | const char *name; | |
176 | segT sec; | |
177 | bfd_mach_o_section *msect; | |
178 | const mach_o_section_name_xlat *xlat; | |
179 | ||
180 | /* This provides default bfd flags and default mach-o section type and | |
181 | attributes along with the canonical name. */ | |
182 | xlat = bfd_mach_o_section_data_for_mach_sect (stdoutput, segname, sectname); | |
183 | ||
33eaf5de | 184 | /* TODO: more checking of whether overrides are actually allowed. */ |
8cf6e084 IS |
185 | |
186 | if (xlat != NULL) | |
187 | { | |
188 | name = xstrdup (xlat->bfd_name); | |
189 | sectype = xlat->macho_sectype; | |
190 | if (specified_mask & SECT_TYPE_SPECIFIED) | |
191 | { | |
192 | if ((sectype == BFD_MACH_O_S_ZEROFILL | |
193 | || sectype == BFD_MACH_O_S_GB_ZEROFILL) | |
194 | && sectype != usectype) | |
33eaf5de | 195 | as_bad (_("cannot override zerofill section type for `%s,%s'"), |
8cf6e084 IS |
196 | segname, sectname); |
197 | else | |
198 | sectype = usectype; | |
199 | } | |
200 | secattr = xlat->macho_secattr; | |
201 | secalign = xlat->sectalign; | |
202 | flags = xlat->bfd_flags; | |
203 | } | |
204 | else | |
205 | { | |
206 | /* There is no normal BFD section name for this section. Create one. | |
207 | The name created doesn't really matter as it will never be written | |
208 | on disk. */ | |
29a2809e | 209 | name = concat (segname, ".", sectname, (char *) NULL); |
8cf6e084 IS |
210 | if (specified_mask & SECT_TYPE_SPECIFIED) |
211 | sectype = usectype; | |
212 | else | |
213 | sectype = BFD_MACH_O_S_REGULAR; | |
214 | secattr = BFD_MACH_O_S_ATTR_NONE; | |
215 | secalign = 0; | |
216 | flags = SEC_NO_FLAGS; | |
217 | } | |
218 | ||
219 | /* For now, just use what the user provided. */ | |
220 | ||
221 | if (specified_mask & SECT_ATTR_SPECIFIED) | |
222 | secattr = usecattr; | |
223 | ||
224 | if (specified_mask & SECT_ALGN_SPECIFIED) | |
225 | secalign = ualign; | |
226 | ||
227 | /* Sub-segments don't exists as is on Mach-O. */ | |
228 | sec = subseg_new (name, 0); | |
229 | ||
230 | oldflags = bfd_get_section_flags (stdoutput, sec); | |
231 | msect = bfd_mach_o_get_mach_o_section (sec); | |
232 | ||
233 | if (oldflags == SEC_NO_FLAGS) | |
234 | { | |
a5759139 IS |
235 | /* In the absence of canonical information, try to determine CODE and |
236 | DEBUG section flags from the mach-o section data. */ | |
237 | if (flags == SEC_NO_FLAGS | |
238 | && (specified_mask & SECT_ATTR_SPECIFIED) | |
239 | && (secattr & BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS)) | |
240 | flags |= SEC_CODE; | |
3739860c | 241 | |
a5759139 IS |
242 | if (flags == SEC_NO_FLAGS |
243 | && (specified_mask & SECT_ATTR_SPECIFIED) | |
244 | && (secattr & BFD_MACH_O_S_ATTR_DEBUG)) | |
245 | flags |= SEC_DEBUGGING; | |
246 | ||
8cf6e084 IS |
247 | /* New, so just use the defaults or what's specified. */ |
248 | if (! bfd_set_section_flags (stdoutput, sec, flags)) | |
249 | as_warn (_("failed to set flags for \"%s\": %s"), | |
250 | bfd_section_name (stdoutput, sec), | |
251 | bfd_errmsg (bfd_get_error ())); | |
3739860c | 252 | |
8cf6e084 IS |
253 | strncpy (msect->segname, segname, sizeof (msect->segname)); |
254 | strncpy (msect->sectname, sectname, sizeof (msect->sectname)); | |
255 | ||
256 | msect->align = secalign; | |
257 | msect->flags = sectype | secattr; | |
3739860c | 258 | |
8cf6e084 IS |
259 | if (sectype == BFD_MACH_O_S_ZEROFILL |
260 | || sectype == BFD_MACH_O_S_GB_ZEROFILL) | |
261 | seg_info (sec)->bss = 1; | |
262 | } | |
263 | else if (flags != SEC_NO_FLAGS) | |
264 | { | |
265 | if (flags != oldflags | |
266 | || msect->flags != (secattr | sectype)) | |
267 | as_warn (_("Ignoring changed section attributes for %s"), name); | |
268 | } | |
269 | ||
fb4914b0 IS |
270 | if (specified_mask & SECT_STUB_SPECIFIED) |
271 | /* At present, the stub size is not supplied from the BFD tables. */ | |
272 | msect->reserved2 = stub_size; | |
273 | ||
8cf6e084 IS |
274 | return sec; |
275 | } | |
276 | ||
a4551119 TG |
277 | /* .section |
278 | ||
279 | The '.section' specification syntax looks like: | |
280 | .section <segment> , <section> [, type [, attribs [, size]]] | |
281 | ||
282 | White space is allowed everywhere between elements. | |
283 | ||
284 | <segment> and <section> may be from 0 to 16 chars in length - they may | |
3739860c | 285 | contain spaces but leading and trailing space will be trimmed. It is |
a4551119 TG |
286 | mandatory that they be present (or that zero-length names are indicated |
287 | by ",,"). | |
288 | ||
289 | There is only a single section type for any entry. | |
290 | ||
291 | There may be multiple attributes, they are delimited by `+'. | |
292 | ||
293 | Not all section types and attributes are accepted by the Darwin system | |
294 | assemblers as user-specifiable - although, at present, we do here. */ | |
74a6005f TG |
295 | |
296 | static void | |
297 | obj_mach_o_section (int ignore ATTRIBUTE_UNUSED) | |
298 | { | |
a4551119 | 299 | unsigned int sectype = BFD_MACH_O_S_REGULAR; |
8cf6e084 | 300 | unsigned int specified_mask = 0; |
74a6005f TG |
301 | unsigned int secattr = 0; |
302 | offsetT sizeof_stub = 0; | |
8cf6e084 | 303 | segT new_seg; |
a4551119 TG |
304 | char segname[17]; |
305 | char sectname[17]; | |
74a6005f | 306 | |
ab76eeaf IS |
307 | #ifdef md_flush_pending_output |
308 | md_flush_pending_output (); | |
309 | #endif | |
310 | ||
33eaf5de | 311 | /* Get the User's segment and section names. */ |
8cf6e084 IS |
312 | if (! obj_mach_o_get_section_names (segname, sectname, 17, 17)) |
313 | return; | |
74a6005f | 314 | |
8cf6e084 | 315 | /* Parse section type, if present. */ |
74a6005f TG |
316 | if (*input_line_pointer == ',') |
317 | { | |
8cf6e084 IS |
318 | char *p; |
319 | char c; | |
a4551119 TG |
320 | char tmpc; |
321 | int len; | |
74a6005f | 322 | input_line_pointer++; |
a4551119 | 323 | SKIP_WHITESPACE (); |
74a6005f | 324 | p = input_line_pointer; |
a4551119 TG |
325 | while ((c = *input_line_pointer) != ',' |
326 | && !is_end_of_line[(unsigned char) c]) | |
327 | input_line_pointer++; | |
328 | ||
329 | len = input_line_pointer - p; | |
330 | /* strip trailing spaces. */ | |
331 | while (len > 0 && p[len-1] == ' ') | |
332 | len--; | |
333 | tmpc = p[len]; | |
334 | ||
335 | /* Temporarily make a string from the token. */ | |
336 | p[len] = 0; | |
ab76eeaf | 337 | sectype = bfd_mach_o_get_section_type_from_name (stdoutput, p); |
a4551119 | 338 | if (sectype > 255) /* Max Section ID == 255. */ |
74a6005f TG |
339 | { |
340 | as_bad (_("unknown or invalid section type '%s'"), p); | |
ab76eeaf IS |
341 | p[len] = tmpc; |
342 | ignore_rest_of_line (); | |
343 | return; | |
74a6005f | 344 | } |
a4551119 | 345 | else |
8cf6e084 | 346 | specified_mask |= SECT_TYPE_SPECIFIED; |
a4551119 | 347 | /* Restore. */ |
ab76eeaf | 348 | p[len] = tmpc; |
a4551119 TG |
349 | |
350 | /* Parse attributes. | |
351 | TODO: check validity of attributes for section type. */ | |
8cf6e084 IS |
352 | if ((specified_mask & SECT_TYPE_SPECIFIED) |
353 | && c == ',') | |
74a6005f TG |
354 | { |
355 | do | |
356 | { | |
357 | int attr; | |
358 | ||
a4551119 | 359 | /* Skip initial `,' and subsequent `+'. */ |
74a6005f | 360 | input_line_pointer++; |
a4551119 TG |
361 | SKIP_WHITESPACE (); |
362 | p = input_line_pointer; | |
363 | while ((c = *input_line_pointer) != '+' | |
364 | && c != ',' | |
365 | && !is_end_of_line[(unsigned char) c]) | |
366 | input_line_pointer++; | |
367 | ||
368 | len = input_line_pointer - p; | |
369 | /* strip trailing spaces. */ | |
370 | while (len > 0 && p[len-1] == ' ') | |
371 | len--; | |
372 | tmpc = p[len]; | |
373 | ||
374 | /* Temporarily make a string from the token. */ | |
375 | p[len] ='\0'; | |
74a6005f | 376 | attr = bfd_mach_o_get_section_attribute_from_name (p); |
a4551119 | 377 | if (attr == -1) |
ab76eeaf IS |
378 | { |
379 | as_bad (_("unknown or invalid section attribute '%s'"), p); | |
380 | p[len] = tmpc; | |
381 | ignore_rest_of_line (); | |
382 | return; | |
383 | } | |
74a6005f | 384 | else |
a4551119 | 385 | { |
8cf6e084 | 386 | specified_mask |= SECT_ATTR_SPECIFIED; |
a4551119 TG |
387 | secattr |= attr; |
388 | } | |
389 | /* Restore. */ | |
390 | p[len] = tmpc; | |
74a6005f TG |
391 | } |
392 | while (*input_line_pointer == '+'); | |
393 | ||
394 | /* Parse sizeof_stub. */ | |
3739860c | 395 | if ((specified_mask & SECT_ATTR_SPECIFIED) |
8cf6e084 | 396 | && *input_line_pointer == ',') |
74a6005f TG |
397 | { |
398 | if (sectype != BFD_MACH_O_S_SYMBOL_STUBS) | |
ab76eeaf IS |
399 | { |
400 | as_bad (_("unexpected section size information")); | |
401 | ignore_rest_of_line (); | |
402 | return; | |
403 | } | |
74a6005f | 404 | |
a4551119 | 405 | input_line_pointer++; |
74a6005f | 406 | sizeof_stub = get_absolute_expression (); |
fb4914b0 | 407 | specified_mask |= SECT_STUB_SPECIFIED; |
74a6005f | 408 | } |
3739860c | 409 | else if ((specified_mask & SECT_ATTR_SPECIFIED) |
8cf6e084 | 410 | && sectype == BFD_MACH_O_S_SYMBOL_STUBS) |
ab76eeaf IS |
411 | { |
412 | as_bad (_("missing sizeof_stub expression")); | |
413 | ignore_rest_of_line (); | |
414 | return; | |
415 | } | |
74a6005f TG |
416 | } |
417 | } | |
74a6005f | 418 | |
3739860c | 419 | new_seg = obj_mach_o_make_or_get_sect (segname, sectname, specified_mask, |
8cf6e084 IS |
420 | sectype, secattr, 0 /*align */, |
421 | sizeof_stub); | |
422 | if (new_seg != NULL) | |
a4551119 | 423 | { |
8cf6e084 IS |
424 | subseg_set (new_seg, 0); |
425 | demand_empty_rest_of_line (); | |
a4551119 | 426 | } |
8cf6e084 | 427 | } |
74a6005f | 428 | |
8cf6e084 | 429 | /* .zerofill segname, sectname [, symbolname, size [, align]] |
74a6005f | 430 | |
8cf6e084 | 431 | Zerofill switches, temporarily, to a sect of type 'zerofill'. |
74a6005f | 432 | |
8cf6e084 IS |
433 | If a variable name is given, it defines that in the section. |
434 | Otherwise it just creates the section if it doesn't exist. */ | |
435 | ||
436 | static void | |
437 | obj_mach_o_zerofill (int ignore ATTRIBUTE_UNUSED) | |
438 | { | |
439 | char segname[17]; | |
440 | char sectname[17]; | |
441 | segT old_seg = now_seg; | |
442 | segT new_seg; | |
443 | symbolS *sym = NULL; | |
444 | unsigned int align = 0; | |
445 | unsigned int specified_mask = 0; | |
facf03f2 | 446 | offsetT size = 0; |
8cf6e084 IS |
447 | |
448 | #ifdef md_flush_pending_output | |
449 | md_flush_pending_output (); | |
450 | #endif | |
451 | ||
33eaf5de | 452 | /* Get the User's segment and section names. */ |
8cf6e084 IS |
453 | if (! obj_mach_o_get_section_names (segname, sectname, 17, 17)) |
454 | return; | |
455 | ||
456 | /* Parse variable definition, if present. */ | |
457 | if (*input_line_pointer == ',') | |
74a6005f | 458 | { |
3739860c | 459 | /* Parse symbol, size [.align] |
8cf6e084 IS |
460 | We follow the method of s_common_internal, with the difference |
461 | that the symbol cannot be a duplicate-common. */ | |
462 | char *name; | |
463 | char c; | |
464 | char *p; | |
465 | expressionS exp; | |
3739860c | 466 | |
8cf6e084 IS |
467 | input_line_pointer++; /* Skip ',' */ |
468 | SKIP_WHITESPACE (); | |
d02603dc | 469 | c = get_symbol_name (&name); |
8cf6e084 IS |
470 | /* Just after name is now '\0'. */ |
471 | p = input_line_pointer; | |
472 | *p = c; | |
473 | ||
474 | if (name == p) | |
a4551119 | 475 | { |
8cf6e084 IS |
476 | as_bad (_("expected symbol name")); |
477 | ignore_rest_of_line (); | |
478 | goto done; | |
479 | } | |
480 | ||
d02603dc | 481 | SKIP_WHITESPACE_AFTER_NAME (); |
8cf6e084 IS |
482 | if (*input_line_pointer == ',') |
483 | input_line_pointer++; | |
484 | ||
485 | expression_and_evaluate (&exp); | |
486 | if (exp.X_op != O_constant | |
487 | && exp.X_op != O_absent) | |
488 | { | |
489 | as_bad (_("bad or irreducible absolute expression")); | |
490 | ignore_rest_of_line (); | |
491 | goto done; | |
492 | } | |
493 | else if (exp.X_op == O_absent) | |
494 | { | |
495 | as_bad (_("missing size expression")); | |
496 | ignore_rest_of_line (); | |
497 | goto done; | |
498 | } | |
499 | ||
500 | size = exp.X_add_number; | |
501 | size &= ((offsetT) 2 << (stdoutput->arch_info->bits_per_address - 1)) - 1; | |
502 | if (exp.X_add_number != size || !exp.X_unsigned) | |
503 | { | |
504 | as_warn (_("size (%ld) out of range, ignored"), | |
505 | (long) exp.X_add_number); | |
506 | ignore_rest_of_line (); | |
507 | goto done; | |
508 | } | |
509 | ||
510 | *p = 0; /* Make the name into a c string for err messages. */ | |
511 | sym = symbol_find_or_make (name); | |
512 | if (S_IS_DEFINED (sym) || symbol_equated_p (sym)) | |
513 | { | |
514 | as_bad (_("symbol `%s' is already defined"), name); | |
515 | *p = c; | |
516 | ignore_rest_of_line (); | |
517 | goto done; | |
518 | } | |
519 | ||
520 | size = S_GET_VALUE (sym); | |
521 | if (size == 0) | |
522 | size = exp.X_add_number; | |
523 | else if (size != exp.X_add_number) | |
524 | as_warn (_("size of \"%s\" is already %ld; not changing to %ld"), | |
525 | name, (long) size, (long) exp.X_add_number); | |
526 | ||
527 | *p = c; /* Restore the termination char. */ | |
3739860c L |
528 | |
529 | SKIP_WHITESPACE (); | |
8cf6e084 IS |
530 | if (*input_line_pointer == ',') |
531 | { | |
532 | align = (unsigned int) parse_align (0); | |
533 | if (align == (unsigned int) -1) | |
534 | { | |
535 | as_warn (_("align value not recognized, using size")); | |
536 | align = size; | |
537 | } | |
538 | if (align > 15) | |
539 | { | |
540 | as_warn (_("Alignment (%lu) too large: 15 assumed."), | |
541 | (unsigned long)align); | |
542 | align = 15; | |
543 | } | |
544 | specified_mask |= SECT_ALGN_SPECIFIED; | |
a4551119 | 545 | } |
74a6005f | 546 | } |
8cf6e084 IS |
547 | /* else just a section definition. */ |
548 | ||
549 | specified_mask |= SECT_TYPE_SPECIFIED; | |
3739860c | 550 | new_seg = obj_mach_o_make_or_get_sect (segname, sectname, specified_mask, |
8cf6e084 IS |
551 | BFD_MACH_O_S_ZEROFILL, |
552 | BFD_MACH_O_S_ATTR_NONE, | |
553 | align, (offsetT) 0 /*stub size*/); | |
554 | if (new_seg == NULL) | |
555 | return; | |
556 | ||
557 | /* In case the user specifies the bss section by mach-o name. | |
558 | Create it on demand */ | |
559 | if (strcmp (new_seg->name, BSS_SECTION_NAME) == 0 | |
560 | && bss_section == NULL) | |
561 | bss_section = new_seg; | |
562 | ||
563 | subseg_set (new_seg, 0); | |
564 | ||
565 | if (sym != NULL) | |
74a6005f | 566 | { |
8cf6e084 IS |
567 | char *pfrag; |
568 | ||
569 | if (align) | |
570 | { | |
571 | record_alignment (new_seg, align); | |
572 | frag_align (align, 0, 0); | |
573 | } | |
574 | ||
575 | /* Detach from old frag. */ | |
576 | if (S_GET_SEGMENT (sym) == new_seg) | |
577 | symbol_get_frag (sym)->fr_symbol = NULL; | |
578 | ||
579 | symbol_set_frag (sym, frag_now); | |
580 | pfrag = frag_var (rs_org, 1, 1, 0, sym, size, NULL); | |
581 | *pfrag = 0; | |
582 | ||
583 | S_SET_SEGMENT (sym, new_seg); | |
584 | if (new_seg == bss_section) | |
585 | S_CLEAR_EXTERNAL (sym); | |
74a6005f | 586 | } |
8cf6e084 IS |
587 | |
588 | done: | |
589 | /* switch back to the section that was current before the .zerofill. */ | |
590 | subseg_set (old_seg, 0); | |
74a6005f TG |
591 | } |
592 | ||
3739860c | 593 | static segT |
a4551119 | 594 | obj_mach_o_segT_from_bfd_name (const char *nam, int must_succeed) |
74a6005f | 595 | { |
a4551119 TG |
596 | const mach_o_section_name_xlat *xlat; |
597 | const char *segn; | |
598 | segT sec; | |
599 | ||
600 | /* BFD has tables of flags and default attributes for all the sections that | |
601 | have a 'canonical' name. */ | |
602 | xlat = bfd_mach_o_section_data_for_bfd_name (stdoutput, nam, &segn); | |
603 | if (xlat == NULL) | |
604 | { | |
605 | if (must_succeed) | |
606 | as_fatal (_("BFD is out of sync with GAS, " | |
607 | "unhandled well-known section type `%s'"), nam); | |
608 | return NULL; | |
609 | } | |
610 | ||
611 | sec = bfd_get_section_by_name (stdoutput, nam); | |
612 | if (sec == NULL) | |
613 | { | |
614 | bfd_mach_o_section *msect; | |
615 | ||
616 | sec = subseg_force_new (xlat->bfd_name, 0); | |
617 | ||
618 | /* Set default type, attributes and alignment. */ | |
619 | msect = bfd_mach_o_get_mach_o_section (sec); | |
620 | msect->flags = xlat->macho_sectype | xlat->macho_secattr; | |
621 | msect->align = xlat->sectalign; | |
622 | ||
3739860c | 623 | if ((msect->flags & BFD_MACH_O_SECTION_TYPE_MASK) |
a4551119 TG |
624 | == BFD_MACH_O_S_ZEROFILL) |
625 | seg_info (sec)->bss = 1; | |
626 | } | |
627 | ||
628 | return sec; | |
629 | } | |
630 | ||
631 | static const char * const known_sections[] = | |
632 | { | |
633 | /* 0 */ NULL, | |
634 | /* __TEXT */ | |
635 | /* 1 */ ".const", | |
636 | /* 2 */ ".static_const", | |
637 | /* 3 */ ".cstring", | |
638 | /* 4 */ ".literal4", | |
639 | /* 5 */ ".literal8", | |
640 | /* 6 */ ".literal16", | |
641 | /* 7 */ ".constructor", | |
642 | /* 8 */ ".destructor", | |
643 | /* 9 */ ".eh_frame", | |
644 | /* __DATA */ | |
645 | /* 10 */ ".const_data", | |
646 | /* 11 */ ".static_data", | |
647 | /* 12 */ ".mod_init_func", | |
648 | /* 13 */ ".mod_term_func", | |
649 | /* 14 */ ".dyld", | |
650 | /* 15 */ ".cfstring" | |
74a6005f TG |
651 | }; |
652 | ||
a4551119 | 653 | /* Interface for a known non-optional section directive. */ |
74a6005f TG |
654 | |
655 | static void | |
656 | obj_mach_o_known_section (int sect_index) | |
657 | { | |
a4551119 TG |
658 | segT section; |
659 | ||
660 | #ifdef md_flush_pending_output | |
661 | md_flush_pending_output (); | |
662 | #endif | |
663 | ||
664 | section = obj_mach_o_segT_from_bfd_name (known_sections[sect_index], 1); | |
665 | if (section != NULL) | |
666 | subseg_set (section, 0); | |
667 | ||
668 | /* else, we leave the section as it was; there was a fatal error anyway. */ | |
669 | } | |
670 | ||
671 | static const char * const objc_sections[] = | |
672 | { | |
673 | /* 0 */ NULL, | |
674 | /* 1 */ ".objc_class", | |
675 | /* 2 */ ".objc_meta_class", | |
676 | /* 3 */ ".objc_cat_cls_meth", | |
677 | /* 4 */ ".objc_cat_inst_meth", | |
678 | /* 5 */ ".objc_protocol", | |
679 | /* 6 */ ".objc_string_object", | |
680 | /* 7 */ ".objc_cls_meth", | |
681 | /* 8 */ ".objc_inst_meth", | |
682 | /* 9 */ ".objc_cls_refs", | |
683 | /* 10 */ ".objc_message_refs", | |
684 | /* 11 */ ".objc_symbols", | |
685 | /* 12 */ ".objc_category", | |
686 | /* 13 */ ".objc_class_vars", | |
687 | /* 14 */ ".objc_instance_vars", | |
688 | /* 15 */ ".objc_module_info", | |
689 | /* 16 */ ".cstring", /* objc_class_names Alias for .cstring */ | |
690 | /* 17 */ ".cstring", /* Alias objc_meth_var_types for .cstring */ | |
691 | /* 18 */ ".cstring", /* objc_meth_var_names Alias for .cstring */ | |
692 | /* 19 */ ".objc_selector_strs", | |
693 | /* 20 */ ".objc_image_info", /* extension. */ | |
694 | /* 21 */ ".objc_selector_fixup", /* extension. */ | |
695 | /* 22 */ ".objc1_class_ext", /* ObjC-1 extension. */ | |
696 | /* 23 */ ".objc1_property_list", /* ObjC-1 extension. */ | |
697 | /* 24 */ ".objc1_protocol_ext" /* ObjC-1 extension. */ | |
698 | }; | |
699 | ||
700 | /* This currently does the same as known_sections, but kept separate for | |
701 | ease of maintenance. */ | |
702 | ||
703 | static void | |
704 | obj_mach_o_objc_section (int sect_index) | |
705 | { | |
706 | segT section; | |
3739860c | 707 | |
a4551119 TG |
708 | #ifdef md_flush_pending_output |
709 | md_flush_pending_output (); | |
710 | #endif | |
711 | ||
712 | section = obj_mach_o_segT_from_bfd_name (objc_sections[sect_index], 1); | |
713 | if (section != NULL) | |
714 | { | |
bcf0aac6 IS |
715 | obj_mach_o_seen_objc_section = 1; /* We need to ensure that certain |
716 | sections are present and in the | |
717 | right order. */ | |
a4551119 TG |
718 | subseg_set (section, 0); |
719 | } | |
720 | ||
721 | /* else, we leave the section as it was; there was a fatal error anyway. */ | |
722 | } | |
723 | ||
724 | /* Debug section directives. */ | |
725 | ||
726 | static const char * const debug_sections[] = | |
727 | { | |
728 | /* 0 */ NULL, | |
729 | /* __DWARF */ | |
730 | /* 1 */ ".debug_frame", | |
731 | /* 2 */ ".debug_info", | |
732 | /* 3 */ ".debug_abbrev", | |
733 | /* 4 */ ".debug_aranges", | |
734 | /* 5 */ ".debug_macinfo", | |
735 | /* 6 */ ".debug_line", | |
736 | /* 7 */ ".debug_loc", | |
737 | /* 8 */ ".debug_pubnames", | |
738 | /* 9 */ ".debug_pubtypes", | |
739 | /* 10 */ ".debug_str", | |
740 | /* 11 */ ".debug_ranges", | |
741 | /* 12 */ ".debug_macro" | |
742 | }; | |
743 | ||
744 | /* ??? Maybe these should be conditional on gdwarf-*. | |
745 | It`s also likely that we will need to be able to set them from the cfi | |
746 | code. */ | |
747 | ||
748 | static void | |
749 | obj_mach_o_debug_section (int sect_index) | |
750 | { | |
751 | segT section; | |
752 | ||
753 | #ifdef md_flush_pending_output | |
754 | md_flush_pending_output (); | |
755 | #endif | |
756 | ||
757 | section = obj_mach_o_segT_from_bfd_name (debug_sections[sect_index], 1); | |
758 | if (section != NULL) | |
759 | subseg_set (section, 0); | |
760 | ||
761 | /* else, we leave the section as it was; there was a fatal error anyway. */ | |
762 | } | |
763 | ||
764 | /* This could be moved to the tc-xx files, but there is so little dependency | |
765 | there, that the code might as well be shared. */ | |
766 | ||
3739860c | 767 | struct opt_tgt_sect |
a4551119 TG |
768 | { |
769 | const char *name; | |
770 | unsigned x86_val; | |
771 | unsigned ppc_val; | |
772 | }; | |
773 | ||
774 | /* The extensions here are for specific sections that are generated by GCC | |
775 | and Darwin system tools, but don't have directives in the `system as'. */ | |
776 | ||
777 | static const struct opt_tgt_sect tgt_sections[] = | |
778 | { | |
779 | /* 0 */ { NULL, 0, 0}, | |
780 | /* 1 */ { ".lazy_symbol_pointer", 0, 0}, | |
781 | /* 2 */ { ".lazy_symbol_pointer2", 0, 0}, /* X86 - extension */ | |
782 | /* 3 */ { ".lazy_symbol_pointer3", 0, 0}, /* X86 - extension */ | |
783 | /* 4 */ { ".non_lazy_symbol_pointer", 0, 0}, | |
784 | /* 5 */ { ".non_lazy_symbol_pointer_x86", 0, 0}, /* X86 - extension */ | |
785 | /* 6 */ { ".symbol_stub", 16, 20}, | |
786 | /* 7 */ { ".symbol_stub1", 0, 16}, /* PPC - extension */ | |
787 | /* 8 */ { ".picsymbol_stub", 26, 36}, | |
788 | /* 9 */ { ".picsymbol_stub1", 0, 32}, /* PPC - extension */ | |
789 | /* 10 */ { ".picsymbol_stub2", 25, 0}, /* X86 - extension */ | |
790 | /* 11 */ { ".picsymbol_stub3", 5, 0}, /* X86 - extension */ | |
791 | }; | |
792 | ||
793 | /* Interface for an optional section directive. */ | |
794 | ||
795 | static void | |
796 | obj_mach_o_opt_tgt_section (int sect_index) | |
797 | { | |
798 | const struct opt_tgt_sect *tgtsct = &tgt_sections[sect_index]; | |
799 | segT section; | |
74a6005f TG |
800 | |
801 | #ifdef md_flush_pending_output | |
802 | md_flush_pending_output (); | |
803 | #endif | |
804 | ||
a4551119 TG |
805 | section = obj_mach_o_segT_from_bfd_name (tgtsct->name, 0); |
806 | if (section == NULL) | |
74a6005f | 807 | { |
a4551119 TG |
808 | as_bad (_("%s is not used for the selected target"), tgtsct->name); |
809 | /* Leave the section as it is. */ | |
74a6005f TG |
810 | } |
811 | else | |
812 | { | |
a4551119 TG |
813 | bfd_mach_o_section *mo_sec = bfd_mach_o_get_mach_o_section (section); |
814 | subseg_set (section, 0); | |
815 | #if defined (TC_I386) | |
816 | mo_sec->reserved2 = tgtsct->x86_val; | |
817 | #elif defined (TC_PPC) | |
818 | mo_sec->reserved2 = tgtsct->ppc_val; | |
819 | #else | |
820 | mo_sec->reserved2 = 0; | |
821 | #endif | |
822 | } | |
823 | } | |
74a6005f | 824 | |
a4551119 TG |
825 | /* We don't necessarily have the three 'base' sections on mach-o. |
826 | Normally, we would start up with only the 'text' section defined. | |
827 | However, even that can be suppressed with (TODO) c/l option "-n". | |
828 | Thus, we have to be able to create all three sections on-demand. */ | |
74a6005f | 829 | |
a4551119 TG |
830 | static void |
831 | obj_mach_o_base_section (int sect_index) | |
832 | { | |
833 | segT section; | |
834 | ||
835 | #ifdef md_flush_pending_output | |
836 | md_flush_pending_output (); | |
837 | #endif | |
838 | ||
839 | /* We don't support numeric (or any other) qualifications on the | |
840 | well-known section shorthands. */ | |
841 | demand_empty_rest_of_line (); | |
842 | ||
843 | switch (sect_index) | |
844 | { | |
845 | /* Handle the three sections that are globally known within GAS. | |
846 | For Mach-O, these are created on demand rather than at startup. */ | |
847 | case 1: | |
848 | if (text_section == NULL) | |
849 | text_section = obj_mach_o_segT_from_bfd_name (TEXT_SECTION_NAME, 1); | |
850 | if (obj_mach_o_is_static) | |
851 | { | |
852 | bfd_mach_o_section *mo_sec | |
853 | = bfd_mach_o_get_mach_o_section (text_section); | |
854 | mo_sec->flags &= ~BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS; | |
855 | } | |
856 | section = text_section; | |
857 | break; | |
858 | case 2: | |
859 | if (data_section == NULL) | |
860 | data_section = obj_mach_o_segT_from_bfd_name (DATA_SECTION_NAME, 1); | |
861 | section = data_section; | |
862 | break; | |
863 | case 3: | |
864 | /* ??? maybe this achieves very little, as an addition. */ | |
865 | if (bss_section == NULL) | |
866 | { | |
867 | bss_section = obj_mach_o_segT_from_bfd_name (BSS_SECTION_NAME, 1); | |
868 | seg_info (bss_section)->bss = 1; | |
869 | } | |
870 | section = bss_section; | |
871 | break; | |
872 | default: | |
873 | as_fatal (_("internal error: base section index out of range")); | |
874 | return; | |
875 | break; | |
74a6005f | 876 | } |
a4551119 | 877 | subseg_set (section, 0); |
74a6005f TG |
878 | } |
879 | ||
a4551119 TG |
880 | /* This finishes off parsing a .comm or .lcomm statement, which both can have |
881 | an (optional) alignment field. It also allows us to create the bss section | |
882 | on demand. */ | |
74a6005f TG |
883 | |
884 | static symbolS * | |
a4551119 TG |
885 | obj_mach_o_common_parse (int is_local, symbolS *symbolP, |
886 | addressT size) | |
74a6005f TG |
887 | { |
888 | addressT align = 0; | |
b22161d6 | 889 | bfd_mach_o_asymbol *s; |
74a6005f | 890 | |
3739860c | 891 | SKIP_WHITESPACE (); |
8cf6e084 | 892 | |
a4551119 TG |
893 | /* Both comm and lcomm take an optional alignment, as a power |
894 | of two between 1 and 15. */ | |
74a6005f TG |
895 | if (*input_line_pointer == ',') |
896 | { | |
a4551119 | 897 | /* We expect a power of 2. */ |
74a6005f TG |
898 | align = parse_align (0); |
899 | if (align == (addressT) -1) | |
900 | return NULL; | |
a4551119 TG |
901 | if (align > 15) |
902 | { | |
903 | as_warn (_("Alignment (%lu) too large: 15 assumed."), | |
904 | (unsigned long)align); | |
905 | align = 15; | |
906 | } | |
74a6005f TG |
907 | } |
908 | ||
b22161d6 | 909 | s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (symbolP); |
a4551119 TG |
910 | if (is_local) |
911 | { | |
912 | /* Create the BSS section on demand. */ | |
913 | if (bss_section == NULL) | |
914 | { | |
915 | bss_section = obj_mach_o_segT_from_bfd_name (BSS_SECTION_NAME, 1); | |
3739860c | 916 | seg_info (bss_section)->bss = 1; |
a4551119 TG |
917 | } |
918 | bss_alloc (symbolP, size, align); | |
b22161d6 | 919 | s->n_type = BFD_MACH_O_N_SECT; |
a4551119 TG |
920 | S_CLEAR_EXTERNAL (symbolP); |
921 | } | |
922 | else | |
923 | { | |
924 | S_SET_VALUE (symbolP, size); | |
925 | S_SET_ALIGN (symbolP, align); | |
926 | S_SET_EXTERNAL (symbolP); | |
927 | S_SET_SEGMENT (symbolP, bfd_com_section_ptr); | |
b22161d6 | 928 | s->n_type = BFD_MACH_O_N_UNDF | BFD_MACH_O_N_EXT; |
a4551119 | 929 | } |
74a6005f | 930 | |
b22161d6 IS |
931 | /* This is a data object (whatever we choose that to mean). */ |
932 | s->symbol.flags |= BSF_OBJECT; | |
933 | ||
934 | /* We've set symbol qualifiers, so validate if you can. */ | |
935 | s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; | |
74a6005f TG |
936 | |
937 | return symbolP; | |
938 | } | |
939 | ||
940 | static void | |
a4551119 | 941 | obj_mach_o_comm (int is_local) |
74a6005f | 942 | { |
a4551119 | 943 | s_comm_internal (is_local, obj_mach_o_common_parse); |
74a6005f TG |
944 | } |
945 | ||
0c9ef0f0 TG |
946 | /* Set properties that apply to the whole file. At present, the only |
947 | one defined, is subsections_via_symbols. */ | |
948 | ||
949 | typedef enum obj_mach_o_file_properties { | |
950 | OBJ_MACH_O_FILE_PROP_NONE = 0, | |
951 | OBJ_MACH_O_FILE_PROP_SUBSECTS_VIA_SYMS, | |
952 | OBJ_MACH_O_FILE_PROP_MAX | |
953 | } obj_mach_o_file_properties; | |
954 | ||
3739860c | 955 | static void |
0c9ef0f0 | 956 | obj_mach_o_fileprop (int prop) |
74a6005f | 957 | { |
0c9ef0f0 TG |
958 | if (prop < 0 || prop >= OBJ_MACH_O_FILE_PROP_MAX) |
959 | as_fatal (_("internal error: bad file property ID %d"), prop); | |
3739860c | 960 | |
0c9ef0f0 TG |
961 | switch ((obj_mach_o_file_properties) prop) |
962 | { | |
963 | case OBJ_MACH_O_FILE_PROP_SUBSECTS_VIA_SYMS: | |
499963bc | 964 | obj_mach_o_subsections_by_symbols = 1; |
3739860c | 965 | if (!bfd_set_private_flags (stdoutput, |
0c9ef0f0 TG |
966 | BFD_MACH_O_MH_SUBSECTIONS_VIA_SYMBOLS)) |
967 | as_bad (_("failed to set subsections by symbols")); | |
968 | demand_empty_rest_of_line (); | |
969 | break; | |
970 | default: | |
971 | break; | |
972 | } | |
74a6005f TG |
973 | } |
974 | ||
3739860c | 975 | /* Temporary markers for symbol reference data. |
b22161d6 IS |
976 | Lazy will remain in place. */ |
977 | #define LAZY 0x01 | |
978 | #define REFE 0x02 | |
979 | ||
980 | /* We have a bunch of qualifiers that may be applied to symbols. | |
981 | .globl is handled here so that we might make sure that conflicting qualifiers | |
982 | are caught where possible. */ | |
983 | ||
984 | typedef enum obj_mach_o_symbol_type { | |
985 | OBJ_MACH_O_SYM_UNK = 0, | |
986 | OBJ_MACH_O_SYM_LOCAL = 1, | |
987 | OBJ_MACH_O_SYM_GLOBL = 2, | |
988 | OBJ_MACH_O_SYM_REFERENCE = 3, | |
989 | OBJ_MACH_O_SYM_WEAK_REF = 4, | |
990 | OBJ_MACH_O_SYM_LAZY_REF = 5, | |
991 | OBJ_MACH_O_SYM_WEAK_DEF = 6, | |
992 | OBJ_MACH_O_SYM_PRIV_EXT = 7, | |
993 | OBJ_MACH_O_SYM_NO_DEAD_STRIP = 8, | |
994 | OBJ_MACH_O_SYM_WEAK = 9 | |
995 | } obj_mach_o_symbol_type; | |
996 | ||
997 | /* Set Mach-O-specific symbol qualifiers. */ | |
998 | ||
999 | static int | |
1000 | obj_mach_o_set_symbol_qualifier (symbolS *sym, int type) | |
1001 | { | |
1002 | int is_defined; | |
1003 | bfd_mach_o_asymbol *s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (sym); | |
1004 | bfd_mach_o_section *sec; | |
1005 | int sectype = -1; | |
b22161d6 IS |
1006 | |
1007 | /* If the symbol is defined, then we can do more rigorous checking on | |
3739860c | 1008 | the validity of the qualifiers. Otherwise, we are stuck with waiting |
b22161d6 | 1009 | until it's defined - or until write the file. |
3739860c | 1010 | |
b22161d6 IS |
1011 | In certain cases (e.g. when a symbol qualifier is intended to introduce |
1012 | an undefined symbol in a stubs section) we should check that the current | |
1013 | section is appropriate to the qualifier. */ | |
1014 | ||
1015 | is_defined = s->symbol.section != bfd_und_section_ptr; | |
1016 | if (is_defined) | |
1017 | sec = bfd_mach_o_get_mach_o_section (s->symbol.section) ; | |
1018 | else | |
1019 | sec = bfd_mach_o_get_mach_o_section (now_seg) ; | |
1020 | ||
1021 | if (sec != NULL) | |
1022 | sectype = sec->flags & BFD_MACH_O_SECTION_TYPE_MASK; | |
1023 | ||
1024 | switch ((obj_mach_o_symbol_type) type) | |
1025 | { | |
1026 | case OBJ_MACH_O_SYM_LOCAL: | |
1027 | /* This is an extension over the system tools. */ | |
1028 | if (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT)) | |
1029 | { | |
1030 | as_bad (_("'%s' previously declared as '%s'."), s->symbol.name, | |
1031 | (s->n_type & BFD_MACH_O_N_PEXT) ? "private extern" | |
1032 | : "global" ); | |
a03f9b1a AM |
1033 | s->symbol.udata.i = SYM_MACHO_FIELDS_UNSET; |
1034 | return 1; | |
b22161d6 IS |
1035 | } |
1036 | else | |
1037 | { | |
1038 | s->n_type &= ~BFD_MACH_O_N_EXT; | |
1039 | S_CLEAR_EXTERNAL (sym); | |
1040 | } | |
1041 | break; | |
1042 | ||
1043 | case OBJ_MACH_O_SYM_PRIV_EXT: | |
1044 | s->n_type |= BFD_MACH_O_N_PEXT ; | |
50d10658 | 1045 | s->n_desc &= ~LAZY; /* The native tool switches this off too. */ |
b22161d6 IS |
1046 | /* We follow the system tools in marking PEXT as also global. */ |
1047 | /* Fall through. */ | |
1048 | ||
1049 | case OBJ_MACH_O_SYM_GLOBL: | |
1050 | /* It's not an error to define a symbol and then make it global. */ | |
1051 | s->n_type |= BFD_MACH_O_N_EXT; | |
1052 | S_SET_EXTERNAL (sym); | |
1053 | break; | |
1054 | ||
1055 | case OBJ_MACH_O_SYM_REFERENCE: | |
1056 | if (is_defined) | |
1057 | s->n_desc |= BFD_MACH_O_N_NO_DEAD_STRIP; | |
1058 | else | |
1059 | s->n_desc |= (REFE | BFD_MACH_O_N_NO_DEAD_STRIP); | |
1060 | break; | |
1061 | ||
1062 | case OBJ_MACH_O_SYM_LAZY_REF: | |
1063 | if (is_defined) | |
1064 | s->n_desc |= BFD_MACH_O_N_NO_DEAD_STRIP; | |
1065 | else | |
1066 | s->n_desc |= (REFE | LAZY | BFD_MACH_O_N_NO_DEAD_STRIP); | |
1067 | break; | |
1068 | ||
1069 | /* Force ld to retain the symbol - even if it appears unused. */ | |
1070 | case OBJ_MACH_O_SYM_NO_DEAD_STRIP: | |
1071 | s->n_desc |= BFD_MACH_O_N_NO_DEAD_STRIP ; | |
1072 | break; | |
1073 | ||
1074 | /* Mach-O's idea of weak ... */ | |
1075 | case OBJ_MACH_O_SYM_WEAK_REF: | |
1076 | s->n_desc |= BFD_MACH_O_N_WEAK_REF ; | |
1077 | break; | |
1078 | ||
1079 | case OBJ_MACH_O_SYM_WEAK_DEF: | |
1080 | if (is_defined && sectype != BFD_MACH_O_S_COALESCED) | |
1081 | { | |
1082 | as_bad (_("'%s' can't be a weak_definition (currently only" | |
1083 | " supported in sections of type coalesced)"), | |
1084 | s->symbol.name); | |
a03f9b1a AM |
1085 | s->symbol.udata.i = SYM_MACHO_FIELDS_UNSET; |
1086 | return 1; | |
b22161d6 IS |
1087 | } |
1088 | else | |
1089 | s->n_desc |= BFD_MACH_O_N_WEAK_DEF; | |
1090 | break; | |
1091 | ||
1092 | case OBJ_MACH_O_SYM_WEAK: | |
1093 | /* A generic 'weak' - we try to figure out what it means at | |
1094 | symbol frob time. */ | |
1095 | S_SET_WEAK (sym); | |
1096 | break; | |
1097 | ||
1098 | default: | |
1099 | break; | |
1100 | } | |
1101 | ||
1102 | /* We've seen some kind of qualifier - check validity if or when the entity | |
1103 | is defined. */ | |
1104 | s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; | |
a03f9b1a | 1105 | return 0; |
b22161d6 IS |
1106 | } |
1107 | ||
1108 | /* Respond to symbol qualifiers. | |
1109 | All of the form: | |
1110 | .<qualifier> symbol [, symbol]* | |
1111 | a list of symbols is an extension over the Darwin system as. */ | |
1112 | ||
1113 | static void | |
1114 | obj_mach_o_sym_qual (int ntype) | |
1115 | { | |
1116 | char *name; | |
1117 | char c; | |
1118 | symbolS *symbolP; | |
1119 | ||
1120 | #ifdef md_flush_pending_output | |
1121 | md_flush_pending_output (); | |
1122 | #endif | |
1123 | ||
1124 | do | |
1125 | { | |
d02603dc | 1126 | c = get_symbol_name (&name); |
b22161d6 IS |
1127 | symbolP = symbol_find_or_make (name); |
1128 | obj_mach_o_set_symbol_qualifier (symbolP, ntype); | |
1129 | *input_line_pointer = c; | |
d02603dc | 1130 | SKIP_WHITESPACE_AFTER_NAME (); |
b22161d6 IS |
1131 | c = *input_line_pointer; |
1132 | if (c == ',') | |
1133 | { | |
1134 | input_line_pointer++; | |
1135 | SKIP_WHITESPACE (); | |
1136 | if (is_end_of_line[(unsigned char) *input_line_pointer]) | |
1137 | c = '\n'; | |
1138 | } | |
1139 | } | |
1140 | while (c == ','); | |
1141 | ||
1142 | demand_empty_rest_of_line (); | |
1143 | } | |
1144 | ||
50d10658 IS |
1145 | typedef struct obj_mach_o_indirect_sym |
1146 | { | |
1147 | symbolS *sym; | |
1148 | segT sect; | |
1149 | struct obj_mach_o_indirect_sym *next; | |
1150 | } obj_mach_o_indirect_sym; | |
1151 | ||
1152 | /* We store in order an maintain a pointer to the last one - to save reversing | |
1153 | later. */ | |
1154 | obj_mach_o_indirect_sym *indirect_syms; | |
1155 | obj_mach_o_indirect_sym *indirect_syms_tail; | |
a4551119 TG |
1156 | |
1157 | static void | |
50d10658 | 1158 | obj_mach_o_indirect_symbol (int arg ATTRIBUTE_UNUSED) |
a4551119 | 1159 | { |
50d10658 IS |
1160 | bfd_mach_o_section *sec = bfd_mach_o_get_mach_o_section (now_seg); |
1161 | ||
1162 | #ifdef md_flush_pending_output | |
1163 | md_flush_pending_output (); | |
1164 | #endif | |
1165 | ||
1166 | if (obj_mach_o_is_static) | |
1167 | as_bad (_("use of .indirect_symbols requires `-dynamic'")); | |
1168 | ||
1169 | switch (sec->flags & BFD_MACH_O_SECTION_TYPE_MASK) | |
1170 | { | |
1171 | case BFD_MACH_O_S_SYMBOL_STUBS: | |
1172 | case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS: | |
1173 | case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS: | |
1174 | { | |
1175 | obj_mach_o_indirect_sym *isym; | |
d02603dc NC |
1176 | char *name; |
1177 | char c = get_symbol_name (&name); | |
50d10658 IS |
1178 | symbolS *sym = symbol_find_or_make (name); |
1179 | unsigned int elsize = | |
1180 | bfd_mach_o_section_get_entry_size (stdoutput, sec); | |
1181 | ||
1182 | if (elsize == 0) | |
1183 | { | |
1184 | as_bad (_("attempt to add an indirect_symbol to a stub or" | |
1185 | " reference section with a zero-sized element at %s"), | |
1186 | name); | |
d02603dc | 1187 | (void) restore_line_pointer (c); |
50d10658 IS |
1188 | ignore_rest_of_line (); |
1189 | return; | |
d02603dc NC |
1190 | } |
1191 | (void) restore_line_pointer (c); | |
50d10658 | 1192 | |
3739860c L |
1193 | /* The indirect symbols are validated after the symbol table is |
1194 | frozen, we must make sure that if a local symbol is used as an | |
8e43fc02 IS |
1195 | indirect, it is promoted to a 'real' one. Fetching the bfd sym |
1196 | achieves this. */ | |
1197 | symbol_get_bfdsym (sym); | |
add39d23 | 1198 | isym = XNEW (obj_mach_o_indirect_sym); |
50d10658 IS |
1199 | |
1200 | /* Just record the data for now, we will validate it when we | |
1201 | compute the output in obj_mach_o_set_indirect_symbols. */ | |
1202 | isym->sym = sym; | |
1203 | isym->sect = now_seg; | |
1204 | isym->next = NULL; | |
1205 | if (indirect_syms == NULL) | |
1206 | indirect_syms = isym; | |
1207 | else | |
1208 | indirect_syms_tail->next = isym; | |
1209 | indirect_syms_tail = isym; | |
1210 | } | |
1211 | break; | |
1212 | ||
1213 | default: | |
1214 | as_bad (_("an .indirect_symbol must be in a symbol pointer" | |
1215 | " or stub section.")); | |
1216 | ignore_rest_of_line (); | |
1217 | return; | |
1218 | } | |
1219 | demand_empty_rest_of_line (); | |
a4551119 TG |
1220 | } |
1221 | ||
e57f8c65 TG |
1222 | const pseudo_typeS mach_o_pseudo_table[] = |
1223 | { | |
a4551119 | 1224 | /* Section directives. */ |
74a6005f | 1225 | { "comm", obj_mach_o_comm, 0 }, |
a4551119 TG |
1226 | { "lcomm", obj_mach_o_comm, 1 }, |
1227 | ||
1228 | { "text", obj_mach_o_base_section, 1}, | |
1229 | { "data", obj_mach_o_base_section, 2}, | |
1230 | { "bss", obj_mach_o_base_section, 3}, /* extension */ | |
1231 | ||
1232 | { "const", obj_mach_o_known_section, 1}, | |
1233 | { "static_const", obj_mach_o_known_section, 2}, | |
1234 | { "cstring", obj_mach_o_known_section, 3}, | |
1235 | { "literal4", obj_mach_o_known_section, 4}, | |
1236 | { "literal8", obj_mach_o_known_section, 5}, | |
1237 | { "literal16", obj_mach_o_known_section, 6}, | |
1238 | { "constructor", obj_mach_o_known_section, 7}, | |
1239 | { "destructor", obj_mach_o_known_section, 8}, | |
1240 | { "eh_frame", obj_mach_o_known_section, 9}, | |
1241 | ||
1242 | { "const_data", obj_mach_o_known_section, 10}, | |
1243 | { "static_data", obj_mach_o_known_section, 11}, | |
1244 | { "mod_init_func", obj_mach_o_known_section, 12}, | |
1245 | { "mod_term_func", obj_mach_o_known_section, 13}, | |
1246 | { "dyld", obj_mach_o_known_section, 14}, | |
1247 | { "cfstring", obj_mach_o_known_section, 15}, | |
1248 | ||
1249 | { "objc_class", obj_mach_o_objc_section, 1}, | |
1250 | { "objc_meta_class", obj_mach_o_objc_section, 2}, | |
1251 | { "objc_cat_cls_meth", obj_mach_o_objc_section, 3}, | |
1252 | { "objc_cat_inst_meth", obj_mach_o_objc_section, 4}, | |
1253 | { "objc_protocol", obj_mach_o_objc_section, 5}, | |
1254 | { "objc_string_object", obj_mach_o_objc_section, 6}, | |
1255 | { "objc_cls_meth", obj_mach_o_objc_section, 7}, | |
1256 | { "objc_inst_meth", obj_mach_o_objc_section, 8}, | |
1257 | { "objc_cls_refs", obj_mach_o_objc_section, 9}, | |
1258 | { "objc_message_refs", obj_mach_o_objc_section, 10}, | |
1259 | { "objc_symbols", obj_mach_o_objc_section, 11}, | |
1260 | { "objc_category", obj_mach_o_objc_section, 12}, | |
1261 | { "objc_class_vars", obj_mach_o_objc_section, 13}, | |
1262 | { "objc_instance_vars", obj_mach_o_objc_section, 14}, | |
1263 | { "objc_module_info", obj_mach_o_objc_section, 15}, | |
1264 | { "objc_class_names", obj_mach_o_objc_section, 16}, /* Alias for .cstring */ | |
1265 | { "objc_meth_var_types", obj_mach_o_objc_section, 17}, /* Alias for .cstring */ | |
1266 | { "objc_meth_var_names", obj_mach_o_objc_section, 18}, /* Alias for .cstring */ | |
1267 | { "objc_selector_strs", obj_mach_o_objc_section, 19}, | |
1268 | { "objc_image_info", obj_mach_o_objc_section, 20}, /* extension. */ | |
1269 | { "objc_selector_fixup", obj_mach_o_objc_section, 21}, /* extension. */ | |
1270 | { "objc1_class_ext", obj_mach_o_objc_section, 22}, /* ObjC-1 extension. */ | |
1271 | { "objc1_property_list", obj_mach_o_objc_section, 23}, /* ObjC-1 extension. */ | |
1272 | { "objc1_protocol_ext", obj_mach_o_objc_section, 24}, /* ObjC-1 extension. */ | |
1273 | ||
1274 | { "debug_frame", obj_mach_o_debug_section, 1}, /* extension. */ | |
1275 | { "debug_info", obj_mach_o_debug_section, 2}, /* extension. */ | |
1276 | { "debug_abbrev", obj_mach_o_debug_section, 3}, /* extension. */ | |
1277 | { "debug_aranges", obj_mach_o_debug_section, 4}, /* extension. */ | |
1278 | { "debug_macinfo", obj_mach_o_debug_section, 5}, /* extension. */ | |
1279 | { "debug_line", obj_mach_o_debug_section, 6}, /* extension. */ | |
1280 | { "debug_loc", obj_mach_o_debug_section, 7}, /* extension. */ | |
1281 | { "debug_pubnames", obj_mach_o_debug_section, 8}, /* extension. */ | |
1282 | { "debug_pubtypes", obj_mach_o_debug_section, 9}, /* extension. */ | |
1283 | { "debug_str", obj_mach_o_debug_section, 10}, /* extension. */ | |
1284 | { "debug_ranges", obj_mach_o_debug_section, 11}, /* extension. */ | |
1285 | { "debug_macro", obj_mach_o_debug_section, 12}, /* extension. */ | |
3739860c | 1286 | |
a4551119 TG |
1287 | { "lazy_symbol_pointer", obj_mach_o_opt_tgt_section, 1}, |
1288 | { "lazy_symbol_pointer2", obj_mach_o_opt_tgt_section, 2}, /* extension. */ | |
1289 | { "lazy_symbol_pointer3", obj_mach_o_opt_tgt_section, 3}, /* extension. */ | |
1290 | { "non_lazy_symbol_pointer", obj_mach_o_opt_tgt_section, 4}, | |
1291 | { "non_lazy_symbol_pointer_x86", obj_mach_o_opt_tgt_section, 5}, /* extension. */ | |
1292 | { "symbol_stub", obj_mach_o_opt_tgt_section, 6}, | |
1293 | { "symbol_stub1", obj_mach_o_opt_tgt_section, 7}, /* extension. */ | |
1294 | { "picsymbol_stub", obj_mach_o_opt_tgt_section, 8}, /* extension. */ | |
1295 | { "picsymbol_stub1", obj_mach_o_opt_tgt_section, 9}, /* extension. */ | |
1296 | { "picsymbol_stub2", obj_mach_o_opt_tgt_section, 4}, /* extension. */ | |
1297 | { "picsymbol_stub3", obj_mach_o_opt_tgt_section, 4}, /* extension. */ | |
1298 | ||
1299 | { "section", obj_mach_o_section, 0}, | |
8cf6e084 | 1300 | { "zerofill", obj_mach_o_zerofill, 0}, |
a4551119 | 1301 | |
b22161d6 IS |
1302 | /* Symbol qualifiers. */ |
1303 | {"local", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_LOCAL}, | |
1304 | {"globl", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_GLOBL}, | |
1305 | {"reference", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_REFERENCE}, | |
1306 | {"weak_reference", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_WEAK_REF}, | |
1307 | {"lazy_reference", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_LAZY_REF}, | |
1308 | {"weak_definition", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_WEAK_DEF}, | |
1309 | {"private_extern", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_PRIV_EXT}, | |
1310 | {"no_dead_strip", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_NO_DEAD_STRIP}, | |
1311 | {"weak", obj_mach_o_sym_qual, OBJ_MACH_O_SYM_WEAK}, /* ext */ | |
1312 | ||
50d10658 | 1313 | { "indirect_symbol", obj_mach_o_indirect_symbol, 0}, |
a4551119 TG |
1314 | |
1315 | /* File flags. */ | |
3739860c | 1316 | { "subsections_via_symbols", obj_mach_o_fileprop, |
0c9ef0f0 | 1317 | OBJ_MACH_O_FILE_PROP_SUBSECTS_VIA_SYMS}, |
e57f8c65 TG |
1318 | |
1319 | {NULL, NULL, 0} | |
1320 | }; | |
68588f95 | 1321 | |
b22161d6 IS |
1322 | /* Determine the default n_type value for a symbol from its section. */ |
1323 | ||
1324 | static unsigned | |
1325 | obj_mach_o_type_for_symbol (bfd_mach_o_asymbol *s) | |
1326 | { | |
1327 | if (s->symbol.section == bfd_abs_section_ptr) | |
1328 | return BFD_MACH_O_N_ABS; | |
1329 | else if (s->symbol.section == bfd_com_section_ptr | |
1330 | || s->symbol.section == bfd_und_section_ptr) | |
1331 | return BFD_MACH_O_N_UNDF; | |
1332 | else | |
1333 | return BFD_MACH_O_N_SECT; | |
1334 | } | |
1335 | ||
cdaa5616 IS |
1336 | void |
1337 | obj_mach_o_frob_colon (const char *name) | |
1338 | { | |
1339 | if (!bfd_is_local_label_name (stdoutput, name)) | |
1340 | { | |
1341 | /* A non-local label will create a new subsection, so start a new | |
1342 | frag. */ | |
1343 | frag_wane (frag_now); | |
1344 | frag_new (0); | |
1345 | } | |
1346 | } | |
1347 | ||
b22161d6 IS |
1348 | /* We need to check the correspondence between some kinds of symbols and their |
1349 | sections. Common and BSS vars will seen via the obj_macho_comm() function. | |
3739860c | 1350 | |
b22161d6 | 1351 | The earlier we can pick up a problem, the better the diagnostics will be. |
3739860c | 1352 | |
b22161d6 IS |
1353 | However, when symbol type information is attached, the symbol section will |
1354 | quite possibly be unknown. So we are stuck with checking (most of the) | |
1355 | validity at the time the file is written (unfortunately, then one doesn't | |
1356 | get line number information in the diagnostic). */ | |
1357 | ||
1358 | /* Here we pick up the case where symbol qualifiers have been applied that | |
1359 | are possibly incompatible with the section etc. that the symbol is defined | |
1360 | in. */ | |
1361 | ||
cdaa5616 | 1362 | void obj_mach_o_frob_label (struct symbol *sp) |
b22161d6 | 1363 | { |
50d10658 IS |
1364 | bfd_mach_o_asymbol *s; |
1365 | unsigned base_type; | |
1366 | bfd_mach_o_section *sec; | |
b22161d6 IS |
1367 | int sectype = -1; |
1368 | ||
cdaa5616 IS |
1369 | if (!bfd_is_local_label_name (stdoutput, S_GET_NAME (sp))) |
1370 | { | |
1371 | /* If this is a non-local label, it should have started a new sub- | |
1372 | section. */ | |
1373 | gas_assert (frag_now->obj_frag_data.subsection == NULL); | |
1374 | frag_now->obj_frag_data.subsection = sp; | |
1375 | } | |
1376 | ||
50d10658 IS |
1377 | /* Leave local symbols alone. */ |
1378 | ||
1379 | if (S_IS_LOCAL (sp)) | |
1380 | return; | |
1381 | ||
1382 | s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (sp); | |
1383 | /* Leave debug symbols alone. */ | |
b22161d6 | 1384 | if ((s->n_type & BFD_MACH_O_N_STAB) != 0) |
50d10658 IS |
1385 | return; |
1386 | ||
1387 | /* This is the base symbol type, that we mask in. */ | |
1388 | base_type = obj_mach_o_type_for_symbol (s); | |
1389 | ||
3739860c | 1390 | sec = bfd_mach_o_get_mach_o_section (s->symbol.section); |
b22161d6 IS |
1391 | if (sec != NULL) |
1392 | sectype = sec->flags & BFD_MACH_O_SECTION_TYPE_MASK; | |
1393 | ||
1394 | /* If there is a pre-existing qualifier, we can make some checks about | |
1395 | validity now. */ | |
1396 | ||
1397 | if(s->symbol.udata.i == SYM_MACHO_FIELDS_NOT_VALIDATED) | |
1398 | { | |
1399 | if ((s->n_desc & BFD_MACH_O_N_WEAK_DEF) | |
1400 | && sectype != BFD_MACH_O_S_COALESCED) | |
a03f9b1a AM |
1401 | { |
1402 | as_bad (_("'%s' can't be a weak_definition (currently only supported" | |
1403 | " in sections of type coalesced)"), s->symbol.name); | |
1404 | /* Don't cascade errors. */ | |
1405 | s->symbol.udata.i = SYM_MACHO_FIELDS_UNSET; | |
1406 | } | |
b22161d6 IS |
1407 | |
1408 | /* Have we changed from an undefined to defined ref? */ | |
1409 | s->n_desc &= ~(REFE | LAZY); | |
1410 | } | |
1411 | ||
1412 | s->n_type &= ~BFD_MACH_O_N_TYPE; | |
1413 | s->n_type |= base_type; | |
1414 | } | |
1415 | ||
1416 | /* This is the fall-back, we come here when we get to the end of the file and | |
1417 | the symbol is not defined - or there are combinations of qualifiers required | |
1418 | (e.g. global + weak_def). */ | |
1419 | ||
1420 | int | |
cdaa5616 | 1421 | obj_mach_o_frob_symbol (struct symbol *sp) |
b22161d6 | 1422 | { |
50d10658 IS |
1423 | bfd_mach_o_asymbol *s; |
1424 | unsigned base_type; | |
1425 | bfd_mach_o_section *sec; | |
b22161d6 | 1426 | int sectype = -1; |
50d10658 IS |
1427 | |
1428 | /* Leave local symbols alone. */ | |
1429 | if (S_IS_LOCAL (sp)) | |
1430 | return 0; | |
1431 | ||
1432 | s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (sp); | |
1433 | /* Leave debug symbols alone. */ | |
1434 | if ((s->n_type & BFD_MACH_O_N_STAB) != 0) | |
1435 | return 0; | |
1436 | ||
1437 | base_type = obj_mach_o_type_for_symbol (s); | |
3739860c | 1438 | sec = bfd_mach_o_get_mach_o_section (s->symbol.section); |
b22161d6 IS |
1439 | if (sec != NULL) |
1440 | sectype = sec->flags & BFD_MACH_O_SECTION_TYPE_MASK; | |
1441 | ||
50d10658 | 1442 | if (s->symbol.section == bfd_und_section_ptr) |
b22161d6 IS |
1443 | { |
1444 | /* ??? Do we really gain much from implementing this as well as the | |
1445 | mach-o specific ones? */ | |
1446 | if (s->symbol.flags & BSF_WEAK) | |
1447 | s->n_desc |= BFD_MACH_O_N_WEAK_REF; | |
1448 | ||
50d10658 IS |
1449 | /* Undefined syms, become extern. */ |
1450 | s->n_type |= BFD_MACH_O_N_EXT; | |
1451 | S_SET_EXTERNAL (sp); | |
1452 | } | |
1453 | else if (s->symbol.section == bfd_com_section_ptr) | |
1454 | { | |
1455 | /* ... so do comm. */ | |
1456 | s->n_type |= BFD_MACH_O_N_EXT; | |
1457 | S_SET_EXTERNAL (sp); | |
b22161d6 IS |
1458 | } |
1459 | else | |
1460 | { | |
1461 | if ((s->symbol.flags & BSF_WEAK) | |
1462 | && (sectype == BFD_MACH_O_S_COALESCED) | |
1463 | && (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT))) | |
1464 | s->n_desc |= BFD_MACH_O_N_WEAK_DEF; | |
1465 | /* ??? we should do this - but then that reveals that the semantics of weak | |
1466 | are different from what's supported in mach-o object files. | |
1467 | else | |
1468 | as_bad (_("'%s' can't be a weak_definition."), | |
1469 | s->symbol.name); */ | |
1470 | } | |
1471 | ||
1472 | if (s->symbol.udata.i == SYM_MACHO_FIELDS_UNSET) | |
1473 | { | |
1474 | /* Anything here that should be added that is non-standard. */ | |
1475 | s->n_desc &= ~BFD_MACH_O_REFERENCE_MASK; | |
3739860c | 1476 | } |
b22161d6 IS |
1477 | else if (s->symbol.udata.i == SYM_MACHO_FIELDS_NOT_VALIDATED) |
1478 | { | |
1479 | /* Try to validate any combinations. */ | |
1480 | if (s->n_desc & BFD_MACH_O_N_WEAK_DEF) | |
1481 | { | |
1482 | if (s->symbol.section == bfd_und_section_ptr) | |
1483 | as_bad (_("'%s' can't be a weak_definition (since it is" | |
1484 | " undefined)"), s->symbol.name); | |
1485 | else if (sectype != BFD_MACH_O_S_COALESCED) | |
1486 | as_bad (_("'%s' can't be a weak_definition (currently only supported" | |
1487 | " in sections of type coalesced)"), s->symbol.name); | |
1488 | else if (! (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT))) | |
1489 | as_bad (_("Non-global symbol: '%s' can't be a weak_definition."), | |
1490 | s->symbol.name); | |
1491 | } | |
1492 | ||
1493 | } | |
1494 | else | |
1495 | as_bad (_("internal error: [%s] unexpected code [%lx] in frob symbol"), | |
1496 | s->symbol.name, (unsigned long)s->symbol.udata.i); | |
1497 | ||
1498 | s->n_type &= ~BFD_MACH_O_N_TYPE; | |
1499 | s->n_type |= base_type; | |
1500 | ||
1501 | if (s->symbol.flags & BSF_GLOBAL) | |
1502 | s->n_type |= BFD_MACH_O_N_EXT; | |
1503 | ||
1504 | /* This cuts both ways - we promote some things to external above. */ | |
1505 | if (s->n_type & (BFD_MACH_O_N_PEXT | BFD_MACH_O_N_EXT)) | |
1506 | S_SET_EXTERNAL (sp); | |
1507 | ||
1508 | return 0; | |
1509 | } | |
1510 | ||
cdaa5616 | 1511 | /* Support stabs for mach-o. */ |
854ac8ba | 1512 | |
cdaa5616 IS |
1513 | void |
1514 | obj_mach_o_process_stab (int what, const char *string, | |
1515 | int type, int other, int desc) | |
854ac8ba | 1516 | { |
cdaa5616 IS |
1517 | symbolS *symbolP; |
1518 | bfd_mach_o_asymbol *s; | |
1519 | ||
1520 | switch (what) | |
1521 | { | |
1522 | case 'd': | |
1523 | symbolP = symbol_new ("", now_seg, frag_now_fix (), frag_now); | |
1524 | /* Special stabd NULL name indicator. */ | |
1525 | S_SET_NAME (symbolP, NULL); | |
1526 | break; | |
1527 | ||
1528 | case 'n': | |
1529 | case 's': | |
1530 | symbolP = symbol_new (string, undefined_section, (valueT) 0, | |
1531 | &zero_address_frag); | |
1532 | pseudo_set (symbolP); | |
1533 | break; | |
1534 | ||
1535 | default: | |
1536 | as_bad(_("unrecognized stab type '%c'"), (char)what); | |
1537 | abort (); | |
1538 | break; | |
1539 | } | |
1540 | ||
1541 | s = (bfd_mach_o_asymbol *) symbol_get_bfdsym (symbolP); | |
1542 | s->n_type = type; | |
1543 | s->n_desc = desc; | |
1544 | /* For stabd, this will eventually get overwritten by the section number. */ | |
1545 | s->n_sect = other; | |
1546 | ||
1547 | /* It's a debug symbol. */ | |
1548 | s->symbol.flags |= BSF_DEBUGGING; | |
3739860c | 1549 | |
16a87420 IS |
1550 | /* We've set it - so check it, if you can, but don't try to create the |
1551 | flags. */ | |
1552 | s->symbol.udata.i = SYM_MACHO_FIELDS_NOT_VALIDATED; | |
1553 | } | |
1554 | ||
1555 | /* This is a place to check for any errors that we can't detect until we know | |
1556 | what remains undefined at the end of assembly. */ | |
1557 | ||
1558 | static void | |
1559 | obj_mach_o_check_before_writing (bfd *abfd ATTRIBUTE_UNUSED, | |
1560 | asection *sec, | |
1561 | void *unused ATTRIBUTE_UNUSED) | |
1562 | { | |
1563 | fixS *fixP; | |
1564 | struct frchain *frchp; | |
1565 | segment_info_type *seginfo = seg_info (sec); | |
1566 | ||
1567 | if (seginfo == NULL) | |
1568 | return; | |
1569 | ||
1570 | /* We are not allowed subtractions where either of the operands is | |
1571 | undefined. So look through the frags for any fixes to check. */ | |
1572 | for (frchp = seginfo->frchainP; frchp != NULL; frchp = frchp->frch_next) | |
1573 | for (fixP = frchp->fix_root; fixP != NULL; fixP = fixP->fx_next) | |
1574 | { | |
1575 | if (fixP->fx_addsy != NULL | |
1576 | && fixP->fx_subsy != NULL | |
1577 | && (! S_IS_DEFINED (fixP->fx_addsy) | |
1578 | || ! S_IS_DEFINED (fixP->fx_subsy))) | |
1579 | { | |
1580 | segT add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy); | |
1581 | segT sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy); | |
1582 | ||
1583 | if (! S_IS_DEFINED (fixP->fx_addsy) | |
1584 | && S_IS_DEFINED (fixP->fx_subsy)) | |
1585 | { | |
1586 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1587 | _("`%s' can't be undefined in `%s' - `%s' {%s section}"), | |
1588 | S_GET_NAME (fixP->fx_addsy), S_GET_NAME (fixP->fx_addsy), | |
1589 | S_GET_NAME (fixP->fx_subsy), segment_name (sub_symbol_segment)); | |
1590 | } | |
1591 | else if (! S_IS_DEFINED (fixP->fx_subsy) | |
1592 | && S_IS_DEFINED (fixP->fx_addsy)) | |
1593 | { | |
1594 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1595 | _("`%s' can't be undefined in `%s' {%s section} - `%s'"), | |
1596 | S_GET_NAME (fixP->fx_subsy), S_GET_NAME (fixP->fx_addsy), | |
1597 | segment_name (add_symbol_segment), S_GET_NAME (fixP->fx_subsy)); | |
1598 | } | |
1599 | else | |
1600 | { | |
1601 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1602 | _("`%s' and `%s' can't be undefined in `%s' - `%s'"), | |
1603 | S_GET_NAME (fixP->fx_addsy), S_GET_NAME (fixP->fx_subsy), | |
1604 | S_GET_NAME (fixP->fx_addsy), S_GET_NAME (fixP->fx_subsy)); | |
1605 | } | |
1606 | } | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | /* Do any checks that we can't complete without knowing what's undefined. */ | |
1611 | void | |
1612 | obj_mach_o_pre_output_hook (void) | |
1613 | { | |
1614 | bfd_map_over_sections (stdoutput, obj_mach_o_check_before_writing, (char *) 0); | |
cdaa5616 IS |
1615 | } |
1616 | ||
1617 | /* Here we count up frags in each subsection (where a sub-section is defined | |
1618 | as starting with a non-local symbol). | |
1619 | Note that, if there are no non-local symbols in a section, all the frags will | |
1620 | be attached as one anonymous subsection. */ | |
1621 | ||
1622 | static void | |
1623 | obj_mach_o_set_subsections (bfd *abfd ATTRIBUTE_UNUSED, | |
1624 | asection *sec, | |
1625 | void *unused ATTRIBUTE_UNUSED) | |
1626 | { | |
1627 | segment_info_type *seginfo = seg_info (sec); | |
1628 | symbolS *cur_subsection = NULL; | |
1629 | struct obj_mach_o_symbol_data *cur_subsection_data = NULL; | |
1630 | fragS *frag; | |
1631 | frchainS *chain; | |
1632 | ||
1633 | /* Protect against sections not created by gas. */ | |
1634 | if (seginfo == NULL) | |
1635 | return; | |
1636 | ||
1637 | /* Attach every frag to a subsection. */ | |
1638 | for (chain = seginfo->frchainP; chain != NULL; chain = chain->frch_next) | |
1639 | for (frag = chain->frch_root; frag != NULL; frag = frag->fr_next) | |
1640 | { | |
1641 | if (frag->obj_frag_data.subsection == NULL) | |
1642 | frag->obj_frag_data.subsection = cur_subsection; | |
1643 | else | |
1644 | { | |
1645 | cur_subsection = frag->obj_frag_data.subsection; | |
1646 | cur_subsection_data = symbol_get_obj (cur_subsection); | |
1647 | cur_subsection_data->subsection_size = 0; | |
1648 | } | |
1649 | if (cur_subsection_data != NULL) | |
1650 | { | |
1651 | /* Update subsection size. */ | |
1652 | cur_subsection_data->subsection_size += frag->fr_fix; | |
1653 | } | |
1654 | } | |
1655 | } | |
1656 | ||
3739860c | 1657 | /* Handle mach-o subsections-via-symbols counting up frags belonging to each |
cdaa5616 IS |
1658 | sub-section. */ |
1659 | ||
1660 | void | |
1661 | obj_mach_o_pre_relax_hook (void) | |
1662 | { | |
1663 | bfd_map_over_sections (stdoutput, obj_mach_o_set_subsections, (char *) 0); | |
854ac8ba IS |
1664 | } |
1665 | ||
c3402d20 IS |
1666 | /* Zerofill and GB Zerofill sections must be sorted to follow all other |
1667 | sections in their segments. | |
1668 | ||
1669 | The native 'as' leaves the sections physically in the order they appear in | |
1670 | the source, and adjusts the section VMAs to meet the constraint. | |
3739860c | 1671 | |
c3402d20 IS |
1672 | We follow this for now - if nothing else, it makes comparison easier. |
1673 | ||
1674 | An alternative implementation would be to sort the sections as ld requires. | |
1675 | It might be advantageous to implement such a scheme in the future (or even | |
1676 | to make the style of section ordering user-selectable). */ | |
1677 | ||
1678 | typedef struct obj_mach_o_set_vma_data | |
1679 | { | |
1680 | bfd_vma vma; | |
1681 | unsigned vma_pass; | |
1682 | unsigned zerofill_seen; | |
1683 | unsigned gb_zerofill_seen; | |
1684 | } obj_mach_o_set_vma_data; | |
1685 | ||
1686 | /* We do (possibly) three passes through to set the vma, so that: | |
1687 | ||
1688 | zerofill sections get VMAs after all others in their segment | |
1689 | GB zerofill get VMAs last. | |
3739860c | 1690 | |
c3402d20 IS |
1691 | As we go, we notice if we see any Zerofill or GB Zerofill sections, so that |
1692 | we can skip the additional passes if there's nothing to do. */ | |
1693 | ||
1694 | static void | |
1695 | obj_mach_o_set_section_vma (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *v_p) | |
1696 | { | |
1697 | bfd_mach_o_section *ms = bfd_mach_o_get_mach_o_section (sec); | |
1698 | unsigned bfd_align = bfd_get_section_alignment (abfd, sec); | |
1699 | obj_mach_o_set_vma_data *p = (struct obj_mach_o_set_vma_data *)v_p; | |
1700 | unsigned sectype = (ms->flags & BFD_MACH_O_SECTION_TYPE_MASK); | |
1701 | unsigned zf; | |
1702 | ||
1703 | zf = 0; | |
1704 | if (sectype == BFD_MACH_O_S_ZEROFILL) | |
1705 | { | |
1706 | zf = 1; | |
1707 | p->zerofill_seen = zf; | |
1708 | } | |
1709 | else if (sectype == BFD_MACH_O_S_GB_ZEROFILL) | |
1710 | { | |
1711 | zf = 2; | |
1712 | p->gb_zerofill_seen = zf; | |
1713 | } | |
1714 | ||
1715 | if (p->vma_pass != zf) | |
1716 | return; | |
1717 | ||
1718 | /* We know the section size now - so make a vma for the section just | |
1719 | based on order. */ | |
1720 | ms->size = bfd_get_section_size (sec); | |
3739860c | 1721 | |
c3402d20 IS |
1722 | /* Make sure that the align agrees, and set to the largest value chosen. */ |
1723 | ms->align = ms->align > bfd_align ? ms->align : bfd_align; | |
1724 | bfd_set_section_alignment (abfd, sec, ms->align); | |
3739860c | 1725 | |
c3402d20 IS |
1726 | p->vma += (1 << ms->align) - 1; |
1727 | p->vma &= ~((1 << ms->align) - 1); | |
1728 | ms->addr = p->vma; | |
1729 | bfd_set_section_vma (abfd, sec, p->vma); | |
1730 | p->vma += ms->size; | |
1731 | } | |
1732 | ||
3739860c | 1733 | /* (potentially) three passes over the sections, setting VMA. We skip the |
c3402d20 IS |
1734 | {gb}zerofill passes if we didn't see any of the relevant sections. */ |
1735 | ||
1736 | void obj_mach_o_post_relax_hook (void) | |
1737 | { | |
1738 | obj_mach_o_set_vma_data d; | |
1739 | ||
1740 | memset (&d, 0, sizeof (d)); | |
3739860c | 1741 | |
c3402d20 IS |
1742 | bfd_map_over_sections (stdoutput, obj_mach_o_set_section_vma, (char *) &d); |
1743 | if ((d.vma_pass = d.zerofill_seen) != 0) | |
1744 | bfd_map_over_sections (stdoutput, obj_mach_o_set_section_vma, (char *) &d); | |
1745 | if ((d.vma_pass = d.gb_zerofill_seen) != 0) | |
1746 | bfd_map_over_sections (stdoutput, obj_mach_o_set_section_vma, (char *) &d); | |
1747 | } | |
1748 | ||
50d10658 IS |
1749 | static void |
1750 | obj_mach_o_set_indirect_symbols (bfd *abfd, asection *sec, | |
1751 | void *xxx ATTRIBUTE_UNUSED) | |
1752 | { | |
1753 | bfd_vma sect_size = bfd_section_size (abfd, sec); | |
1754 | bfd_mach_o_section *ms = bfd_mach_o_get_mach_o_section (sec); | |
1755 | unsigned lazy = 0; | |
1756 | ||
1757 | /* See if we have any indirect syms to consider. */ | |
1758 | if (indirect_syms == NULL) | |
1759 | return; | |
1760 | ||
1761 | /* Process indirect symbols. | |
1762 | Check for errors, if OK attach them as a flat array to the section | |
1763 | for which they are defined. */ | |
1764 | ||
1765 | switch (ms->flags & BFD_MACH_O_SECTION_TYPE_MASK) | |
1766 | { | |
1767 | case BFD_MACH_O_S_SYMBOL_STUBS: | |
1768 | case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS: | |
1769 | lazy = LAZY; | |
1770 | /* Fall through. */ | |
1771 | case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS: | |
1772 | { | |
1773 | unsigned int nactual = 0; | |
1774 | unsigned int ncalc; | |
1775 | obj_mach_o_indirect_sym *isym; | |
1776 | obj_mach_o_indirect_sym *list = NULL; | |
1777 | obj_mach_o_indirect_sym *list_tail = NULL; | |
3739860c | 1778 | unsigned long eltsiz = |
50d10658 IS |
1779 | bfd_mach_o_section_get_entry_size (abfd, ms); |
1780 | ||
1781 | for (isym = indirect_syms; isym != NULL; isym = isym->next) | |
1782 | { | |
1783 | if (isym->sect == sec) | |
1784 | { | |
1785 | nactual++; | |
1786 | if (list == NULL) | |
1787 | list = isym; | |
1788 | else | |
1789 | list_tail->next = isym; | |
1790 | list_tail = isym; | |
1791 | } | |
1792 | } | |
1793 | ||
1794 | /* If none are in this section, stop here. */ | |
1795 | if (nactual == 0) | |
1796 | break; | |
1797 | ||
1798 | /* If we somehow added indirect symbols to a section with a zero | |
1799 | entry size, we're dead ... */ | |
1800 | gas_assert (eltsiz != 0); | |
1801 | ||
1802 | ncalc = (unsigned int) (sect_size / eltsiz); | |
1803 | if (nactual != ncalc) | |
1804 | as_bad (_("the number of .indirect_symbols defined in section %s" | |
1805 | " does not match the number expected (%d defined, %d" | |
1806 | " expected)"), sec->name, nactual, ncalc); | |
1807 | else | |
1808 | { | |
1809 | unsigned n; | |
1810 | bfd_mach_o_asymbol *sym; | |
1811 | ms->indirect_syms = | |
1812 | bfd_zalloc (abfd, | |
1813 | nactual * sizeof (bfd_mach_o_asymbol *)); | |
1814 | ||
1815 | if (ms->indirect_syms == NULL) | |
1816 | { | |
1817 | as_fatal (_("internal error: failed to allocate %d indirect" | |
1818 | "symbol pointers"), nactual); | |
1819 | } | |
3739860c | 1820 | |
50d10658 IS |
1821 | for (isym = list, n = 0; isym != NULL; isym = isym->next, n++) |
1822 | { | |
687be931 | 1823 | sym = (bfd_mach_o_asymbol *)symbol_get_bfdsym (isym->sym); |
50d10658 IS |
1824 | /* Array is init to NULL & NULL signals a local symbol |
1825 | If the section is lazy-bound, we need to keep the | |
687be931 | 1826 | reference to the symbol, since dyld can override. |
3739860c | 1827 | |
687be931 IS |
1828 | Absolute symbols are handled specially. */ |
1829 | if (sym->symbol.section == bfd_abs_section_ptr) | |
1830 | ms->indirect_syms[n] = sym; | |
1831 | else if (S_IS_LOCAL (isym->sym) && ! lazy) | |
50d10658 IS |
1832 | ; |
1833 | else | |
1834 | { | |
50d10658 IS |
1835 | if (sym == NULL) |
1836 | ; | |
1837 | /* If the symbols is external ... */ | |
1838 | else if (S_IS_EXTERNAL (isym->sym) | |
1839 | || (sym->n_type & BFD_MACH_O_N_EXT) | |
1840 | || ! S_IS_DEFINED (isym->sym) | |
1841 | || lazy) | |
1842 | { | |
1843 | sym->n_desc &= ~LAZY; | |
1844 | /* ... it can be lazy, if not defined or hidden. */ | |
3739860c L |
1845 | if ((sym->n_type & BFD_MACH_O_N_TYPE) |
1846 | == BFD_MACH_O_N_UNDF | |
50d10658 IS |
1847 | && ! (sym->n_type & BFD_MACH_O_N_PEXT) |
1848 | && (sym->n_type & BFD_MACH_O_N_EXT)) | |
1849 | sym->n_desc |= lazy; | |
1850 | ms->indirect_syms[n] = sym; | |
1851 | } | |
1852 | } | |
1853 | } | |
1854 | } | |
1855 | } | |
1856 | break; | |
1857 | ||
1858 | default: | |
1859 | break; | |
1860 | } | |
1861 | } | |
1862 | ||
1863 | /* The process of relocation could alter what's externally visible, thus we | |
1864 | leave setting the indirect symbols until last. */ | |
1865 | ||
1866 | void | |
1867 | obj_mach_o_frob_file_after_relocs (void) | |
1868 | { | |
1869 | bfd_map_over_sections (stdoutput, obj_mach_o_set_indirect_symbols, (char *) 0); | |
1870 | } | |
1871 | ||
34dd18bc IS |
1872 | /* Reverse relocations order to make ld happy. */ |
1873 | ||
1874 | void | |
1875 | obj_mach_o_reorder_section_relocs (asection *sec, arelent **rels, unsigned int n) | |
1876 | { | |
1877 | unsigned int i; | |
1878 | unsigned int max = n / 2; | |
1879 | ||
1880 | for (i = 0; i < max; i++) | |
1881 | { | |
1882 | arelent *r = rels[i]; | |
1883 | rels[i] = rels[n - i - 1]; | |
1884 | rels[n - i - 1] = r; | |
1885 | } | |
1886 | bfd_set_reloc (stdoutput, sec, rels, n); | |
1887 | } | |
1888 | ||
cdaa5616 | 1889 | /* Relocation rules are different in frame sections. */ |
68588f95 | 1890 | |
cdaa5616 IS |
1891 | static int |
1892 | obj_mach_o_is_frame_section (segT sec) | |
68588f95 | 1893 | { |
cdaa5616 IS |
1894 | int l; |
1895 | l = strlen (segment_name (sec)); | |
1896 | if ((l == 9 && strncmp (".eh_frame", segment_name (sec), 9) == 0) | |
1897 | || (l == 12 && strncmp (".debug_frame", segment_name (sec), 12) == 0)) | |
1898 | return 1; | |
1899 | return 0; | |
68588f95 | 1900 | } |
854ac8ba IS |
1901 | |
1902 | /* Unless we're in a frame section, we need to force relocs to be generated for | |
1903 | local subtractions. We might eliminate them later (if they are within the | |
1904 | same sub-section) but we don't know that at the point that this decision is | |
1905 | being made. */ | |
1906 | ||
1907 | int | |
3739860c | 1908 | obj_mach_o_allow_local_subtract (expressionS * left ATTRIBUTE_UNUSED, |
854ac8ba IS |
1909 | expressionS * right ATTRIBUTE_UNUSED, |
1910 | segT seg) | |
1911 | { | |
1912 | /* Don't interfere if it's one of the GAS internal sections. */ | |
1913 | if (! SEG_NORMAL (seg)) | |
1914 | return 1; | |
1915 | ||
1916 | /* Allow in frame sections, otherwise emit a reloc. */ | |
1917 | return obj_mach_o_is_frame_section (seg); | |
1918 | } | |
cdaa5616 IS |
1919 | |
1920 | int | |
1921 | obj_mach_o_in_different_subsection (symbolS *a, symbolS *b) | |
1922 | { | |
1923 | fragS *fa; | |
1924 | fragS *fb; | |
1925 | ||
1926 | if (S_GET_SEGMENT (a) != S_GET_SEGMENT (b) | |
1927 | || !S_IS_DEFINED (a) | |
1928 | || !S_IS_DEFINED (b)) | |
1929 | { | |
1930 | /* Not in the same segment, or undefined symbol. */ | |
1931 | return 1; | |
1932 | } | |
1933 | ||
1934 | fa = symbol_get_frag (a); | |
1935 | fb = symbol_get_frag (b); | |
1936 | if (fa == NULL || fb == NULL) | |
1937 | { | |
1938 | /* One of the symbols is not in a subsection. */ | |
1939 | return 1; | |
1940 | } | |
1941 | ||
1942 | return fa->obj_frag_data.subsection != fb->obj_frag_data.subsection; | |
1943 | } | |
1944 | ||
1945 | int | |
1946 | obj_mach_o_force_reloc_sub_same (fixS *fix, segT seg) | |
1947 | { | |
1948 | if (! SEG_NORMAL (seg)) | |
1949 | return 1; | |
1950 | return obj_mach_o_in_different_subsection (fix->fx_addsy, fix->fx_subsy); | |
1951 | } | |
1952 | ||
1953 | int | |
1954 | obj_mach_o_force_reloc_sub_local (fixS *fix, segT seg ATTRIBUTE_UNUSED) | |
1955 | { | |
1956 | return obj_mach_o_in_different_subsection (fix->fx_addsy, fix->fx_subsy); | |
1957 | } | |
1958 | ||
1959 | int | |
1960 | obj_mach_o_force_reloc (fixS *fix) | |
1961 | { | |
1962 | if (generic_force_reloc (fix)) | |
1963 | return 1; | |
1964 | ||
1965 | /* Force a reloc if the target is not in the same subsection. | |
1966 | FIXME: handle (a - b) where a and b belongs to the same subsection ? */ | |
1967 | if (fix->fx_addsy != NULL) | |
1968 | { | |
1969 | symbolS *subsec = fix->fx_frag->obj_frag_data.subsection; | |
1970 | symbolS *targ = fix->fx_addsy; | |
1971 | ||
1972 | /* There might be no subsections at all. */ | |
1973 | if (subsec == NULL) | |
1974 | return 0; | |
1975 | ||
1976 | if (S_GET_SEGMENT (targ) == absolute_section) | |
1977 | return 0; | |
1978 | ||
1979 | return obj_mach_o_in_different_subsection (targ, subsec); | |
1980 | } | |
1981 | return 0; | |
1982 | } |