Commit | Line | Data |
---|---|---|
252b5132 RH |
1 | /* Alpha specific support for 64-bit ELF |
2 | Copyright 1996, 97, 98, 1999 Free Software Foundation, Inc. | |
3 | Contributed by Richard Henderson <rth@tamu.edu>. | |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | /* We need a published ABI spec for this. Until one comes out, don't | |
22 | assume this'll remain unchanged forever. */ | |
23 | ||
24 | #include "bfd.h" | |
25 | #include "sysdep.h" | |
26 | #include "libbfd.h" | |
27 | #include "elf-bfd.h" | |
28 | ||
29 | #include "elf/alpha.h" | |
30 | ||
31 | #define ALPHAECOFF | |
32 | ||
33 | #define NO_COFF_RELOCS | |
34 | #define NO_COFF_SYMBOLS | |
35 | #define NO_COFF_LINENOS | |
36 | ||
37 | /* Get the ECOFF swapping routines. Needed for the debug information. */ | |
38 | #include "coff/internal.h" | |
39 | #include "coff/sym.h" | |
40 | #include "coff/symconst.h" | |
41 | #include "coff/ecoff.h" | |
42 | #include "coff/alpha.h" | |
43 | #include "aout/ar.h" | |
44 | #include "libcoff.h" | |
45 | #include "libecoff.h" | |
46 | #define ECOFF_64 | |
47 | #include "ecoffswap.h" | |
48 | ||
49 | static boolean elf64_alpha_mkobject PARAMS ((bfd *)); | |
50 | static struct bfd_hash_entry * elf64_alpha_link_hash_newfunc | |
51 | PARAMS((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
52 | static struct bfd_link_hash_table * elf64_alpha_bfd_link_hash_table_create | |
53 | PARAMS((bfd *)); | |
54 | ||
55 | static bfd_reloc_status_type elf64_alpha_reloc_nil | |
56 | PARAMS((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); | |
57 | static bfd_reloc_status_type elf64_alpha_reloc_bad | |
58 | PARAMS((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); | |
59 | static bfd_reloc_status_type elf64_alpha_do_reloc_gpdisp | |
60 | PARAMS((bfd *, bfd_vma, bfd_byte *, bfd_byte *)); | |
61 | static bfd_reloc_status_type elf64_alpha_reloc_gpdisp | |
62 | PARAMS((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); | |
63 | ||
64 | static reloc_howto_type * elf64_alpha_bfd_reloc_type_lookup | |
65 | PARAMS((bfd *, bfd_reloc_code_real_type)); | |
66 | static void elf64_alpha_info_to_howto | |
67 | PARAMS((bfd *, arelent *, Elf64_Internal_Rela *)); | |
68 | ||
69 | static boolean elf64_alpha_object_p | |
70 | PARAMS((bfd *)); | |
71 | static boolean elf64_alpha_section_from_shdr | |
72 | PARAMS((bfd *, Elf64_Internal_Shdr *, char *)); | |
73 | static boolean elf64_alpha_fake_sections | |
74 | PARAMS((bfd *, Elf64_Internal_Shdr *, asection *)); | |
75 | static boolean elf64_alpha_create_got_section | |
76 | PARAMS((bfd *, struct bfd_link_info *)); | |
77 | static boolean elf64_alpha_create_dynamic_sections | |
78 | PARAMS((bfd *, struct bfd_link_info *)); | |
79 | ||
80 | static boolean elf64_alpha_read_ecoff_info | |
81 | PARAMS((bfd *, asection *, struct ecoff_debug_info *)); | |
82 | static boolean elf64_alpha_is_local_label_name | |
83 | PARAMS((bfd *, const char *)); | |
84 | static boolean elf64_alpha_find_nearest_line | |
85 | PARAMS((bfd *, asection *, asymbol **, bfd_vma, const char **, | |
86 | const char **, unsigned int *)); | |
87 | ||
88 | #if defined(__STDC__) || defined(ALMOST_STDC) | |
89 | struct alpha_elf_link_hash_entry; | |
90 | #endif | |
91 | ||
92 | static boolean elf64_alpha_output_extsym | |
93 | PARAMS((struct alpha_elf_link_hash_entry *, PTR)); | |
94 | ||
95 | static boolean elf64_alpha_can_merge_gots | |
96 | PARAMS((bfd *, bfd *)); | |
97 | static void elf64_alpha_merge_gots | |
98 | PARAMS((bfd *, bfd *)); | |
99 | static boolean elf64_alpha_calc_got_offsets_for_symbol | |
100 | PARAMS ((struct alpha_elf_link_hash_entry *, PTR)); | |
101 | static void elf64_alpha_calc_got_offsets PARAMS ((struct bfd_link_info *)); | |
102 | static boolean elf64_alpha_size_got_sections | |
103 | PARAMS ((bfd *, struct bfd_link_info *)); | |
104 | static boolean elf64_alpha_always_size_sections | |
105 | PARAMS ((bfd *, struct bfd_link_info *)); | |
106 | static boolean elf64_alpha_calc_dynrel_sizes | |
107 | PARAMS ((struct alpha_elf_link_hash_entry *, struct bfd_link_info *)); | |
108 | static boolean elf64_alpha_add_symbol_hook | |
109 | PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *, | |
110 | const char **, flagword *, asection **, bfd_vma *)); | |
111 | static boolean elf64_alpha_check_relocs | |
112 | PARAMS((bfd *, struct bfd_link_info *, asection *sec, | |
113 | const Elf_Internal_Rela *)); | |
114 | static boolean elf64_alpha_adjust_dynamic_symbol | |
115 | PARAMS((struct bfd_link_info *, struct elf_link_hash_entry *)); | |
116 | static boolean elf64_alpha_size_dynamic_sections | |
117 | PARAMS((bfd *, struct bfd_link_info *)); | |
252b5132 RH |
118 | static boolean elf64_alpha_relocate_section |
119 | PARAMS((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, | |
120 | Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
121 | static boolean elf64_alpha_finish_dynamic_symbol | |
122 | PARAMS((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, | |
123 | Elf_Internal_Sym *)); | |
124 | static boolean elf64_alpha_finish_dynamic_sections | |
125 | PARAMS((bfd *, struct bfd_link_info *)); | |
126 | static boolean elf64_alpha_final_link | |
127 | PARAMS((bfd *, struct bfd_link_info *)); | |
128 | ||
129 | \f | |
130 | struct alpha_elf_link_hash_entry | |
131 | { | |
132 | struct elf_link_hash_entry root; | |
133 | ||
134 | /* External symbol information. */ | |
135 | EXTR esym; | |
136 | ||
137 | /* Cumulative flags for all the .got entries. */ | |
138 | int flags; | |
139 | ||
140 | /* Contexts (LITUSE) in which a literal was referenced. */ | |
141 | #define ALPHA_ELF_LINK_HASH_LU_ADDR 0x01 | |
142 | #define ALPHA_ELF_LINK_HASH_LU_MEM 0x02 | |
143 | #define ALPHA_ELF_LINK_HASH_LU_BYTE 0x04 | |
144 | #define ALPHA_ELF_LINK_HASH_LU_FUNC 0x08 | |
145 | ||
146 | /* Used to implement multiple .got subsections. */ | |
147 | struct alpha_elf_got_entry | |
148 | { | |
149 | struct alpha_elf_got_entry *next; | |
150 | ||
151 | /* which .got subsection? */ | |
152 | bfd *gotobj; | |
153 | ||
154 | /* the addend in effect for this entry. */ | |
155 | bfd_vma addend; | |
156 | ||
157 | /* the .got offset for this entry. */ | |
158 | int got_offset; | |
159 | ||
160 | int flags; | |
161 | ||
162 | /* An additional flag. */ | |
163 | #define ALPHA_ELF_GOT_ENTRY_RELOCS_DONE 0x10 | |
164 | ||
165 | int use_count; | |
166 | } *got_entries; | |
167 | ||
168 | /* used to count non-got, non-plt relocations for delayed sizing | |
169 | of relocation sections. */ | |
170 | struct alpha_elf_reloc_entry | |
171 | { | |
172 | struct alpha_elf_reloc_entry *next; | |
173 | ||
174 | /* which .reloc section? */ | |
175 | asection *srel; | |
176 | ||
177 | /* what kind of relocation? */ | |
178 | unsigned long rtype; | |
179 | ||
180 | /* how many did we find? */ | |
181 | unsigned long count; | |
182 | } *reloc_entries; | |
183 | }; | |
184 | ||
185 | /* Alpha ELF linker hash table. */ | |
186 | ||
187 | struct alpha_elf_link_hash_table | |
188 | { | |
189 | struct elf_link_hash_table root; | |
190 | ||
191 | /* The head of a list of .got subsections linked through | |
192 | alpha_elf_tdata(abfd)->got_link_next. */ | |
193 | bfd *got_list; | |
194 | }; | |
195 | ||
196 | /* Look up an entry in a Alpha ELF linker hash table. */ | |
197 | ||
198 | #define alpha_elf_link_hash_lookup(table, string, create, copy, follow) \ | |
199 | ((struct alpha_elf_link_hash_entry *) \ | |
200 | elf_link_hash_lookup (&(table)->root, (string), (create), \ | |
201 | (copy), (follow))) | |
202 | ||
203 | /* Traverse a Alpha ELF linker hash table. */ | |
204 | ||
205 | #define alpha_elf_link_hash_traverse(table, func, info) \ | |
206 | (elf_link_hash_traverse \ | |
207 | (&(table)->root, \ | |
208 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
209 | (info))) | |
210 | ||
211 | /* Get the Alpha ELF linker hash table from a link_info structure. */ | |
212 | ||
213 | #define alpha_elf_hash_table(p) \ | |
214 | ((struct alpha_elf_link_hash_table *) ((p)->hash)) | |
215 | ||
216 | /* Get the object's symbols as our own entry type. */ | |
217 | ||
218 | #define alpha_elf_sym_hashes(abfd) \ | |
219 | ((struct alpha_elf_link_hash_entry **)elf_sym_hashes(abfd)) | |
220 | ||
221 | /* Should we do dynamic things to this symbol? */ | |
222 | ||
223 | #define alpha_elf_dynamic_symbol_p(h, info) \ | |
224 | ((((info)->shared && !(info)->symbolic) \ | |
225 | || (((h)->elf_link_hash_flags \ | |
226 | & (ELF_LINK_HASH_DEF_DYNAMIC | ELF_LINK_HASH_REF_REGULAR)) \ | |
227 | == (ELF_LINK_HASH_DEF_DYNAMIC | ELF_LINK_HASH_REF_REGULAR)) \ | |
228 | || (h)->root.type == bfd_link_hash_undefweak \ | |
229 | || (h)->root.type == bfd_link_hash_defweak) \ | |
230 | && (h)->dynindx != -1) | |
231 | ||
232 | /* Create an entry in a Alpha ELF linker hash table. */ | |
233 | ||
234 | static struct bfd_hash_entry * | |
235 | elf64_alpha_link_hash_newfunc (entry, table, string) | |
236 | struct bfd_hash_entry *entry; | |
237 | struct bfd_hash_table *table; | |
238 | const char *string; | |
239 | { | |
240 | struct alpha_elf_link_hash_entry *ret = | |
241 | (struct alpha_elf_link_hash_entry *) entry; | |
242 | ||
243 | /* Allocate the structure if it has not already been allocated by a | |
244 | subclass. */ | |
245 | if (ret == (struct alpha_elf_link_hash_entry *) NULL) | |
246 | ret = ((struct alpha_elf_link_hash_entry *) | |
247 | bfd_hash_allocate (table, | |
248 | sizeof (struct alpha_elf_link_hash_entry))); | |
249 | if (ret == (struct alpha_elf_link_hash_entry *) NULL) | |
250 | return (struct bfd_hash_entry *) ret; | |
251 | ||
252 | /* Call the allocation method of the superclass. */ | |
253 | ret = ((struct alpha_elf_link_hash_entry *) | |
254 | _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, | |
255 | table, string)); | |
256 | if (ret != (struct alpha_elf_link_hash_entry *) NULL) | |
257 | { | |
258 | /* Set local fields. */ | |
259 | memset (&ret->esym, 0, sizeof (EXTR)); | |
260 | /* We use -2 as a marker to indicate that the information has | |
261 | not been set. -1 means there is no associated ifd. */ | |
262 | ret->esym.ifd = -2; | |
263 | ret->flags = 0; | |
264 | ret->got_entries = NULL; | |
265 | ret->reloc_entries = NULL; | |
266 | } | |
267 | ||
268 | return (struct bfd_hash_entry *) ret; | |
269 | } | |
270 | ||
271 | /* Create a Alpha ELF linker hash table. */ | |
272 | ||
273 | static struct bfd_link_hash_table * | |
274 | elf64_alpha_bfd_link_hash_table_create (abfd) | |
275 | bfd *abfd; | |
276 | { | |
277 | struct alpha_elf_link_hash_table *ret; | |
278 | ||
279 | ret = ((struct alpha_elf_link_hash_table *) | |
280 | bfd_zalloc (abfd, sizeof (struct alpha_elf_link_hash_table))); | |
281 | if (ret == (struct alpha_elf_link_hash_table *) NULL) | |
282 | return NULL; | |
283 | ||
284 | if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, | |
285 | elf64_alpha_link_hash_newfunc)) | |
286 | { | |
287 | bfd_release (abfd, ret); | |
288 | return NULL; | |
289 | } | |
290 | ||
291 | return &ret->root.root; | |
292 | } | |
293 | \f | |
294 | /* We have some private fields hanging off of the elf_tdata structure. */ | |
295 | ||
296 | struct alpha_elf_obj_tdata | |
297 | { | |
298 | struct elf_obj_tdata root; | |
299 | ||
300 | /* For every input file, these are the got entries for that object's | |
301 | local symbols. */ | |
302 | struct alpha_elf_got_entry ** local_got_entries; | |
303 | ||
304 | /* For every input file, this is the object that owns the got that | |
305 | this input file uses. */ | |
306 | bfd *gotobj; | |
307 | ||
308 | /* For every got, this is a linked list through the objects using this got */ | |
309 | bfd *in_got_link_next; | |
310 | ||
311 | /* For every got, this is a link to the next got subsegment. */ | |
312 | bfd *got_link_next; | |
313 | ||
314 | /* For every got, this is the section. */ | |
315 | asection *got; | |
316 | ||
317 | /* For every got, this is it's total number of *entries*. */ | |
318 | int total_got_entries; | |
319 | ||
320 | /* For every got, this is the sum of the number of *entries* required | |
321 | to hold all of the member object's local got. */ | |
322 | int n_local_got_entries; | |
323 | }; | |
324 | ||
325 | #define alpha_elf_tdata(abfd) \ | |
326 | ((struct alpha_elf_obj_tdata *) (abfd)->tdata.any) | |
327 | ||
328 | static boolean | |
329 | elf64_alpha_mkobject (abfd) | |
330 | bfd *abfd; | |
331 | { | |
332 | abfd->tdata.any = bfd_zalloc (abfd, sizeof (struct alpha_elf_obj_tdata)); | |
333 | if (abfd->tdata.any == NULL) | |
334 | return false; | |
335 | return true; | |
336 | } | |
337 | ||
338 | static boolean | |
339 | elf64_alpha_object_p (abfd) | |
340 | bfd *abfd; | |
341 | { | |
342 | /* Allocate our special target data. */ | |
343 | struct alpha_elf_obj_tdata *new_tdata; | |
344 | new_tdata = bfd_zalloc (abfd, sizeof (struct alpha_elf_obj_tdata)); | |
345 | if (new_tdata == NULL) | |
346 | return false; | |
347 | new_tdata->root = *abfd->tdata.elf_obj_data; | |
348 | abfd->tdata.any = new_tdata; | |
349 | ||
350 | /* Set the right machine number for an Alpha ELF file. */ | |
351 | return bfd_default_set_arch_mach (abfd, bfd_arch_alpha, 0); | |
352 | } | |
353 | \f | |
354 | /* In case we're on a 32-bit machine, construct a 64-bit "-1" value | |
355 | from smaller values. Start with zero, widen, *then* decrement. */ | |
356 | #define MINUS_ONE (((bfd_vma)0) - 1) | |
357 | ||
358 | static reloc_howto_type elf64_alpha_howto_table[] = | |
359 | { | |
360 | HOWTO (R_ALPHA_NONE, /* type */ | |
361 | 0, /* rightshift */ | |
362 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
363 | 8, /* bitsize */ | |
364 | true, /* pc_relative */ | |
365 | 0, /* bitpos */ | |
366 | complain_overflow_dont, /* complain_on_overflow */ | |
367 | elf64_alpha_reloc_nil, /* special_function */ | |
368 | "NONE", /* name */ | |
369 | false, /* partial_inplace */ | |
370 | 0, /* src_mask */ | |
371 | 0, /* dst_mask */ | |
372 | true), /* pcrel_offset */ | |
373 | ||
374 | /* A 32 bit reference to a symbol. */ | |
375 | HOWTO (R_ALPHA_REFLONG, /* type */ | |
376 | 0, /* rightshift */ | |
377 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
378 | 32, /* bitsize */ | |
379 | false, /* pc_relative */ | |
380 | 0, /* bitpos */ | |
381 | complain_overflow_bitfield, /* complain_on_overflow */ | |
382 | 0, /* special_function */ | |
383 | "REFLONG", /* name */ | |
384 | false, /* partial_inplace */ | |
385 | 0xffffffff, /* src_mask */ | |
386 | 0xffffffff, /* dst_mask */ | |
387 | false), /* pcrel_offset */ | |
388 | ||
389 | /* A 64 bit reference to a symbol. */ | |
390 | HOWTO (R_ALPHA_REFQUAD, /* type */ | |
391 | 0, /* rightshift */ | |
392 | 4, /* size (0 = byte, 1 = short, 2 = long) */ | |
393 | 64, /* bitsize */ | |
394 | false, /* pc_relative */ | |
395 | 0, /* bitpos */ | |
396 | complain_overflow_bitfield, /* complain_on_overflow */ | |
397 | 0, /* special_function */ | |
398 | "REFQUAD", /* name */ | |
399 | false, /* partial_inplace */ | |
400 | MINUS_ONE, /* src_mask */ | |
401 | MINUS_ONE, /* dst_mask */ | |
402 | false), /* pcrel_offset */ | |
403 | ||
404 | /* A 32 bit GP relative offset. This is just like REFLONG except | |
405 | that when the value is used the value of the gp register will be | |
406 | added in. */ | |
407 | HOWTO (R_ALPHA_GPREL32, /* type */ | |
408 | 0, /* rightshift */ | |
409 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
410 | 32, /* bitsize */ | |
411 | false, /* pc_relative */ | |
412 | 0, /* bitpos */ | |
413 | complain_overflow_bitfield, /* complain_on_overflow */ | |
414 | 0, /* special_function */ | |
415 | "GPREL32", /* name */ | |
416 | false, /* partial_inplace */ | |
417 | 0xffffffff, /* src_mask */ | |
418 | 0xffffffff, /* dst_mask */ | |
419 | false), /* pcrel_offset */ | |
420 | ||
421 | /* Used for an instruction that refers to memory off the GP register. */ | |
422 | HOWTO (R_ALPHA_LITERAL, /* type */ | |
423 | 0, /* rightshift */ | |
424 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
425 | 16, /* bitsize */ | |
426 | false, /* pc_relative */ | |
427 | 0, /* bitpos */ | |
428 | complain_overflow_signed, /* complain_on_overflow */ | |
429 | 0, /* special_function */ | |
430 | "ELF_LITERAL", /* name */ | |
431 | false, /* partial_inplace */ | |
432 | 0xffff, /* src_mask */ | |
433 | 0xffff, /* dst_mask */ | |
434 | false), /* pcrel_offset */ | |
435 | ||
436 | /* This reloc only appears immediately following an ELF_LITERAL reloc. | |
437 | It identifies a use of the literal. The symbol index is special: | |
438 | 1 means the literal address is in the base register of a memory | |
439 | format instruction; 2 means the literal address is in the byte | |
440 | offset register of a byte-manipulation instruction; 3 means the | |
441 | literal address is in the target register of a jsr instruction. | |
442 | This does not actually do any relocation. */ | |
443 | HOWTO (R_ALPHA_LITUSE, /* type */ | |
444 | 0, /* rightshift */ | |
445 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
446 | 32, /* bitsize */ | |
447 | false, /* pc_relative */ | |
448 | 0, /* bitpos */ | |
449 | complain_overflow_dont, /* complain_on_overflow */ | |
450 | elf64_alpha_reloc_nil, /* special_function */ | |
451 | "LITUSE", /* name */ | |
452 | false, /* partial_inplace */ | |
453 | 0, /* src_mask */ | |
454 | 0, /* dst_mask */ | |
455 | false), /* pcrel_offset */ | |
456 | ||
457 | /* Load the gp register. This is always used for a ldah instruction | |
458 | which loads the upper 16 bits of the gp register. The symbol | |
459 | index of the GPDISP instruction is an offset in bytes to the lda | |
460 | instruction that loads the lower 16 bits. The value to use for | |
461 | the relocation is the difference between the GP value and the | |
462 | current location; the load will always be done against a register | |
463 | holding the current address. | |
464 | ||
465 | NOTE: Unlike ECOFF, partial in-place relocation is not done. If | |
466 | any offset is present in the instructions, it is an offset from | |
467 | the register to the ldah instruction. This lets us avoid any | |
468 | stupid hackery like inventing a gp value to do partial relocation | |
469 | against. Also unlike ECOFF, we do the whole relocation off of | |
470 | the GPDISP rather than a GPDISP_HI16/GPDISP_LO16 pair. An odd, | |
471 | space consuming bit, that, since all the information was present | |
472 | in the GPDISP_HI16 reloc. */ | |
473 | HOWTO (R_ALPHA_GPDISP, /* type */ | |
474 | 16, /* rightshift */ | |
475 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
476 | 16, /* bitsize */ | |
477 | false, /* pc_relative */ | |
478 | 0, /* bitpos */ | |
479 | complain_overflow_dont, /* complain_on_overflow */ | |
480 | elf64_alpha_reloc_gpdisp, /* special_function */ | |
481 | "GPDISP", /* name */ | |
482 | false, /* partial_inplace */ | |
483 | 0xffff, /* src_mask */ | |
484 | 0xffff, /* dst_mask */ | |
485 | true), /* pcrel_offset */ | |
486 | ||
487 | /* A 21 bit branch. */ | |
488 | HOWTO (R_ALPHA_BRADDR, /* type */ | |
489 | 2, /* rightshift */ | |
490 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
491 | 21, /* bitsize */ | |
492 | true, /* pc_relative */ | |
493 | 0, /* bitpos */ | |
494 | complain_overflow_signed, /* complain_on_overflow */ | |
495 | 0, /* special_function */ | |
496 | "BRADDR", /* name */ | |
497 | false, /* partial_inplace */ | |
498 | 0x1fffff, /* src_mask */ | |
499 | 0x1fffff, /* dst_mask */ | |
500 | true), /* pcrel_offset */ | |
501 | ||
502 | /* A hint for a jump to a register. */ | |
503 | HOWTO (R_ALPHA_HINT, /* type */ | |
504 | 2, /* rightshift */ | |
505 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
506 | 14, /* bitsize */ | |
507 | true, /* pc_relative */ | |
508 | 0, /* bitpos */ | |
509 | complain_overflow_dont, /* complain_on_overflow */ | |
510 | 0, /* special_function */ | |
511 | "HINT", /* name */ | |
512 | false, /* partial_inplace */ | |
513 | 0x3fff, /* src_mask */ | |
514 | 0x3fff, /* dst_mask */ | |
515 | true), /* pcrel_offset */ | |
516 | ||
517 | /* 16 bit PC relative offset. */ | |
518 | HOWTO (R_ALPHA_SREL16, /* type */ | |
519 | 0, /* rightshift */ | |
520 | 1, /* size (0 = byte, 1 = short, 2 = long) */ | |
521 | 16, /* bitsize */ | |
522 | true, /* pc_relative */ | |
523 | 0, /* bitpos */ | |
524 | complain_overflow_signed, /* complain_on_overflow */ | |
525 | 0, /* special_function */ | |
526 | "SREL16", /* name */ | |
527 | false, /* partial_inplace */ | |
528 | 0xffff, /* src_mask */ | |
529 | 0xffff, /* dst_mask */ | |
530 | false), /* pcrel_offset */ | |
531 | ||
532 | /* 32 bit PC relative offset. */ | |
533 | HOWTO (R_ALPHA_SREL32, /* type */ | |
534 | 0, /* rightshift */ | |
535 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
536 | 32, /* bitsize */ | |
537 | true, /* pc_relative */ | |
538 | 0, /* bitpos */ | |
539 | complain_overflow_signed, /* complain_on_overflow */ | |
540 | 0, /* special_function */ | |
541 | "SREL32", /* name */ | |
542 | false, /* partial_inplace */ | |
543 | 0xffffffff, /* src_mask */ | |
544 | 0xffffffff, /* dst_mask */ | |
545 | false), /* pcrel_offset */ | |
546 | ||
547 | /* A 64 bit PC relative offset. */ | |
548 | HOWTO (R_ALPHA_SREL64, /* type */ | |
549 | 0, /* rightshift */ | |
550 | 4, /* size (0 = byte, 1 = short, 2 = long) */ | |
551 | 64, /* bitsize */ | |
552 | true, /* pc_relative */ | |
553 | 0, /* bitpos */ | |
554 | complain_overflow_signed, /* complain_on_overflow */ | |
555 | 0, /* special_function */ | |
556 | "SREL64", /* name */ | |
557 | false, /* partial_inplace */ | |
558 | MINUS_ONE, /* src_mask */ | |
559 | MINUS_ONE, /* dst_mask */ | |
560 | false), /* pcrel_offset */ | |
561 | ||
562 | /* Push a value on the reloc evaluation stack. */ | |
563 | /* Not implemented -- it's dumb. */ | |
564 | HOWTO (R_ALPHA_OP_PUSH, /* type */ | |
565 | 0, /* rightshift */ | |
566 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
567 | 0, /* bitsize */ | |
568 | false, /* pc_relative */ | |
569 | 0, /* bitpos */ | |
570 | complain_overflow_dont, /* complain_on_overflow */ | |
571 | elf64_alpha_reloc_bad, /* special_function */ | |
572 | "OP_PUSH", /* name */ | |
573 | false, /* partial_inplace */ | |
574 | 0, /* src_mask */ | |
575 | 0, /* dst_mask */ | |
576 | false), /* pcrel_offset */ | |
577 | ||
578 | /* Store the value from the stack at the given address. Store it in | |
579 | a bitfield of size r_size starting at bit position r_offset. */ | |
580 | /* Not implemented -- it's dumb. */ | |
581 | HOWTO (R_ALPHA_OP_STORE, /* type */ | |
582 | 0, /* rightshift */ | |
583 | 4, /* size (0 = byte, 1 = short, 2 = long) */ | |
584 | 64, /* bitsize */ | |
585 | false, /* pc_relative */ | |
586 | 0, /* bitpos */ | |
587 | complain_overflow_dont, /* complain_on_overflow */ | |
588 | elf64_alpha_reloc_bad, /* special_function */ | |
589 | "OP_STORE", /* name */ | |
590 | false, /* partial_inplace */ | |
591 | 0, /* src_mask */ | |
592 | MINUS_ONE, /* dst_mask */ | |
593 | false), /* pcrel_offset */ | |
594 | ||
595 | /* Subtract the reloc address from the value on the top of the | |
596 | relocation stack. */ | |
597 | /* Not implemented -- it's dumb. */ | |
598 | HOWTO (R_ALPHA_OP_PSUB, /* type */ | |
599 | 0, /* rightshift */ | |
600 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
601 | 0, /* bitsize */ | |
602 | false, /* pc_relative */ | |
603 | 0, /* bitpos */ | |
604 | complain_overflow_dont, /* complain_on_overflow */ | |
605 | elf64_alpha_reloc_bad, /* special_function */ | |
606 | "OP_PSUB", /* name */ | |
607 | false, /* partial_inplace */ | |
608 | 0, /* src_mask */ | |
609 | 0, /* dst_mask */ | |
610 | false), /* pcrel_offset */ | |
611 | ||
612 | /* Shift the value on the top of the relocation stack right by the | |
613 | given value. */ | |
614 | /* Not implemented -- it's dumb. */ | |
615 | HOWTO (R_ALPHA_OP_PRSHIFT, /* type */ | |
616 | 0, /* rightshift */ | |
617 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
618 | 0, /* bitsize */ | |
619 | false, /* pc_relative */ | |
620 | 0, /* bitpos */ | |
621 | complain_overflow_dont, /* complain_on_overflow */ | |
622 | elf64_alpha_reloc_bad, /* special_function */ | |
623 | "OP_PRSHIFT", /* name */ | |
624 | false, /* partial_inplace */ | |
625 | 0, /* src_mask */ | |
626 | 0, /* dst_mask */ | |
627 | false), /* pcrel_offset */ | |
628 | ||
629 | /* Change the value of GP used by +r_addend until the next GPVALUE or the | |
630 | end of the input bfd. */ | |
631 | /* Not implemented -- it's dumb. */ | |
632 | HOWTO (R_ALPHA_GPVALUE, | |
633 | 0, /* rightshift */ | |
634 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
635 | 0, /* bitsize */ | |
636 | false, /* pc_relative */ | |
637 | 0, /* bitpos */ | |
638 | complain_overflow_dont, /* complain_on_overflow */ | |
639 | elf64_alpha_reloc_bad, /* special_function */ | |
640 | "GPVALUE", /* name */ | |
641 | false, /* partial_inplace */ | |
642 | 0, /* src_mask */ | |
643 | 0, /* dst_mask */ | |
644 | false), /* pcrel_offset */ | |
645 | ||
646 | /* The high 16 bits of the displacement from GP to the target. */ | |
647 | HOWTO (R_ALPHA_GPRELHIGH, | |
648 | 0, /* rightshift */ | |
649 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
650 | 16, /* bitsize */ | |
651 | false, /* pc_relative */ | |
652 | 0, /* bitpos */ | |
653 | complain_overflow_signed, /* complain_on_overflow */ | |
654 | elf64_alpha_reloc_bad, /* special_function */ | |
655 | "GPRELHIGH", /* name */ | |
656 | false, /* partial_inplace */ | |
657 | 0xffff, /* src_mask */ | |
658 | 0xffff, /* dst_mask */ | |
659 | false), /* pcrel_offset */ | |
660 | ||
661 | /* The low 16 bits of the displacement from GP to the target. */ | |
662 | HOWTO (R_ALPHA_GPRELLOW, | |
663 | 0, /* rightshift */ | |
664 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
665 | 16, /* bitsize */ | |
666 | false, /* pc_relative */ | |
667 | 0, /* bitpos */ | |
668 | complain_overflow_dont, /* complain_on_overflow */ | |
669 | elf64_alpha_reloc_bad, /* special_function */ | |
670 | "GPRELLOW", /* name */ | |
671 | false, /* partial_inplace */ | |
672 | 0xffff, /* src_mask */ | |
673 | 0xffff, /* dst_mask */ | |
674 | false), /* pcrel_offset */ | |
675 | ||
676 | /* A 16-bit displacement from the GP to the target. */ | |
677 | /* XXX: Not implemented. */ | |
678 | HOWTO (R_ALPHA_IMMED_GP_16, | |
679 | 0, /* rightshift */ | |
680 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
681 | 16, /* bitsize */ | |
682 | false, /* pc_relative */ | |
683 | 0, /* bitpos */ | |
684 | complain_overflow_signed, /* complain_on_overflow */ | |
685 | 0, /* special_function */ | |
686 | "IMMED_GP_16", /* name */ | |
687 | false, /* partial_inplace */ | |
688 | 0xffff, /* src_mask */ | |
689 | 0xffff, /* dst_mask */ | |
690 | false), /* pcrel_offset */ | |
691 | ||
692 | /* The high bits of a 32-bit displacement from the GP to the target; the | |
693 | low bits are supplied in the subsequent R_ALPHA_IMMED_LO32 relocs. */ | |
694 | /* XXX: Not implemented. */ | |
695 | HOWTO (R_ALPHA_IMMED_GP_HI32, | |
696 | 0, /* rightshift */ | |
697 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
698 | 0, /* bitsize */ | |
699 | false, /* pc_relative */ | |
700 | 0, /* bitpos */ | |
701 | complain_overflow_dont, /* complain_on_overflow */ | |
702 | elf64_alpha_reloc_bad, /* special_function */ | |
703 | "IMMED_GP_HI32", /* name */ | |
704 | false, /* partial_inplace */ | |
705 | 0, /* src_mask */ | |
706 | 0, /* dst_mask */ | |
707 | false), /* pcrel_offset */ | |
708 | ||
709 | /* The high bits of a 32-bit displacement to the starting address of the | |
710 | current section (the relocation target is ignored); the low bits are | |
711 | supplied in the subsequent R_ALPHA_IMMED_LO32 relocs. */ | |
712 | /* XXX: Not implemented. */ | |
713 | HOWTO (R_ALPHA_IMMED_SCN_HI32, | |
714 | 0, /* rightshift */ | |
715 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
716 | 0, /* bitsize */ | |
717 | false, /* pc_relative */ | |
718 | 0, /* bitpos */ | |
719 | complain_overflow_dont, /* complain_on_overflow */ | |
720 | elf64_alpha_reloc_bad, /* special_function */ | |
721 | "IMMED_SCN_HI32", /* name */ | |
722 | false, /* partial_inplace */ | |
723 | 0, /* src_mask */ | |
724 | 0, /* dst_mask */ | |
725 | false), /* pcrel_offset */ | |
726 | ||
727 | /* The high bits of a 32-bit displacement from the previous br, bsr, jsr | |
728 | or jmp insn (as tagged by a BRADDR or HINT reloc) to the target; the | |
729 | low bits are supplied by subsequent R_ALPHA_IMMED_LO32 relocs. */ | |
730 | /* XXX: Not implemented. */ | |
731 | HOWTO (R_ALPHA_IMMED_BR_HI32, | |
732 | 0, /* rightshift */ | |
733 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
734 | 0, /* bitsize */ | |
735 | false, /* pc_relative */ | |
736 | 0, /* bitpos */ | |
737 | complain_overflow_dont, /* complain_on_overflow */ | |
738 | elf64_alpha_reloc_bad, /* special_function */ | |
739 | "IMMED_BR_HI32", /* name */ | |
740 | false, /* partial_inplace */ | |
741 | 0, /* src_mask */ | |
742 | 0, /* dst_mask */ | |
743 | false), /* pcrel_offset */ | |
744 | ||
745 | /* The low 16 bits of a displacement calculated in a previous HI32 reloc. */ | |
746 | /* XXX: Not implemented. */ | |
747 | HOWTO (R_ALPHA_IMMED_LO32, | |
748 | 0, /* rightshift */ | |
749 | 0, /* size (0 = byte, 1 = short, 2 = long) */ | |
750 | 0, /* bitsize */ | |
751 | false, /* pc_relative */ | |
752 | 0, /* bitpos */ | |
753 | complain_overflow_dont, /* complain_on_overflow */ | |
754 | elf64_alpha_reloc_bad, /* special_function */ | |
755 | "IMMED_LO32", /* name */ | |
756 | false, /* partial_inplace */ | |
757 | 0, /* src_mask */ | |
758 | 0, /* dst_mask */ | |
759 | false), /* pcrel_offset */ | |
760 | ||
761 | /* Misc ELF relocations. */ | |
762 | ||
763 | /* A dynamic relocation to copy the target into our .dynbss section. */ | |
764 | /* Not generated, as all Alpha objects use PIC, so it is not needed. It | |
765 | is present because every other ELF has one, but should not be used | |
766 | because .dynbss is an ugly thing. */ | |
767 | HOWTO (R_ALPHA_COPY, | |
768 | 0, | |
769 | 0, | |
770 | 0, | |
771 | false, | |
772 | 0, | |
773 | complain_overflow_dont, | |
774 | bfd_elf_generic_reloc, | |
775 | "COPY", | |
776 | false, | |
777 | 0, | |
778 | 0, | |
779 | true), | |
780 | ||
781 | /* A dynamic relocation for a .got entry. */ | |
782 | HOWTO (R_ALPHA_GLOB_DAT, | |
783 | 0, | |
784 | 0, | |
785 | 0, | |
786 | false, | |
787 | 0, | |
788 | complain_overflow_dont, | |
789 | bfd_elf_generic_reloc, | |
790 | "GLOB_DAT", | |
791 | false, | |
792 | 0, | |
793 | 0, | |
794 | true), | |
795 | ||
796 | /* A dynamic relocation for a .plt entry. */ | |
797 | HOWTO (R_ALPHA_JMP_SLOT, | |
798 | 0, | |
799 | 0, | |
800 | 0, | |
801 | false, | |
802 | 0, | |
803 | complain_overflow_dont, | |
804 | bfd_elf_generic_reloc, | |
805 | "JMP_SLOT", | |
806 | false, | |
807 | 0, | |
808 | 0, | |
809 | true), | |
810 | ||
811 | /* A dynamic relocation to add the base of the DSO to a 64-bit field. */ | |
812 | HOWTO (R_ALPHA_RELATIVE, | |
813 | 0, | |
814 | 0, | |
815 | 0, | |
816 | false, | |
817 | 0, | |
818 | complain_overflow_dont, | |
819 | bfd_elf_generic_reloc, | |
820 | "RELATIVE", | |
821 | false, | |
822 | 0, | |
823 | 0, | |
824 | true) | |
825 | }; | |
826 | ||
827 | /* A relocation function which doesn't do anything. */ | |
828 | ||
829 | static bfd_reloc_status_type | |
830 | elf64_alpha_reloc_nil (abfd, reloc, sym, data, sec, output_bfd, error_message) | |
831 | bfd *abfd; | |
832 | arelent *reloc; | |
833 | asymbol *sym; | |
834 | PTR data; | |
835 | asection *sec; | |
836 | bfd *output_bfd; | |
837 | char **error_message; | |
838 | { | |
839 | if (output_bfd) | |
840 | reloc->address += sec->output_offset; | |
841 | return bfd_reloc_ok; | |
842 | } | |
843 | ||
844 | /* A relocation function used for an unsupported reloc. */ | |
845 | ||
846 | static bfd_reloc_status_type | |
847 | elf64_alpha_reloc_bad (abfd, reloc, sym, data, sec, output_bfd, error_message) | |
848 | bfd *abfd; | |
849 | arelent *reloc; | |
850 | asymbol *sym; | |
851 | PTR data; | |
852 | asection *sec; | |
853 | bfd *output_bfd; | |
854 | char **error_message; | |
855 | { | |
856 | if (output_bfd) | |
857 | reloc->address += sec->output_offset; | |
858 | return bfd_reloc_notsupported; | |
859 | } | |
860 | ||
861 | /* Do the work of the GPDISP relocation. */ | |
862 | ||
863 | static bfd_reloc_status_type | |
864 | elf64_alpha_do_reloc_gpdisp (abfd, gpdisp, p_ldah, p_lda) | |
865 | bfd *abfd; | |
866 | bfd_vma gpdisp; | |
867 | bfd_byte *p_ldah; | |
868 | bfd_byte *p_lda; | |
869 | { | |
870 | bfd_reloc_status_type ret = bfd_reloc_ok; | |
871 | bfd_vma addend; | |
872 | unsigned long i_ldah, i_lda; | |
873 | ||
874 | i_ldah = bfd_get_32 (abfd, p_ldah); | |
875 | i_lda = bfd_get_32 (abfd, p_lda); | |
876 | ||
877 | /* Complain if the instructions are not correct. */ | |
878 | if (((i_ldah >> 26) & 0x3f) != 0x09 | |
879 | || ((i_lda >> 26) & 0x3f) != 0x08) | |
880 | ret = bfd_reloc_dangerous; | |
881 | ||
882 | /* Extract the user-supplied offset, mirroring the sign extensions | |
883 | that the instructions perform. */ | |
884 | addend = ((i_ldah & 0xffff) << 16) | (i_lda & 0xffff); | |
885 | addend = (addend ^ 0x80008000) - 0x80008000; | |
886 | ||
887 | gpdisp += addend; | |
888 | ||
889 | if ((bfd_signed_vma) gpdisp < -(bfd_signed_vma) 0x80000000 | |
890 | || (bfd_signed_vma) gpdisp >= (bfd_signed_vma) 0x7fff8000) | |
891 | ret = bfd_reloc_overflow; | |
892 | ||
893 | /* compensate for the sign extension again. */ | |
894 | i_ldah = ((i_ldah & 0xffff0000) | |
895 | | (((gpdisp >> 16) + ((gpdisp >> 15) & 1)) & 0xffff)); | |
896 | i_lda = (i_lda & 0xffff0000) | (gpdisp & 0xffff); | |
897 | ||
898 | bfd_put_32 (abfd, i_ldah, p_ldah); | |
899 | bfd_put_32 (abfd, i_lda, p_lda); | |
900 | ||
901 | return ret; | |
902 | } | |
903 | ||
904 | /* The special function for the GPDISP reloc. */ | |
905 | ||
906 | static bfd_reloc_status_type | |
907 | elf64_alpha_reloc_gpdisp (abfd, reloc_entry, sym, data, input_section, | |
908 | output_bfd, err_msg) | |
909 | bfd *abfd; | |
910 | arelent *reloc_entry; | |
911 | asymbol *sym; | |
912 | PTR data; | |
913 | asection *input_section; | |
914 | bfd *output_bfd; | |
915 | char **err_msg; | |
916 | { | |
917 | bfd_reloc_status_type ret; | |
918 | bfd_vma gp, relocation; | |
919 | bfd_byte *p_ldah, *p_lda; | |
920 | ||
921 | /* Don't do anything if we're not doing a final link. */ | |
922 | if (output_bfd) | |
923 | { | |
924 | reloc_entry->address += input_section->output_offset; | |
925 | return bfd_reloc_ok; | |
926 | } | |
927 | ||
928 | if (reloc_entry->address > input_section->_cooked_size || | |
929 | reloc_entry->address + reloc_entry->addend > input_section->_cooked_size) | |
930 | return bfd_reloc_outofrange; | |
931 | ||
932 | /* The gp used in the portion of the output object to which this | |
933 | input object belongs is cached on the input bfd. */ | |
934 | gp = _bfd_get_gp_value (abfd); | |
935 | ||
936 | relocation = (input_section->output_section->vma | |
937 | + input_section->output_offset | |
938 | + reloc_entry->address); | |
939 | ||
940 | p_ldah = (bfd_byte *) data + reloc_entry->address; | |
941 | p_lda = p_ldah + reloc_entry->addend; | |
942 | ||
943 | ret = elf64_alpha_do_reloc_gpdisp (abfd, gp - relocation, p_ldah, p_lda); | |
944 | ||
945 | /* Complain if the instructions are not correct. */ | |
946 | if (ret == bfd_reloc_dangerous) | |
947 | *err_msg = _("GPDISP relocation did not find ldah and lda instructions"); | |
948 | ||
949 | return ret; | |
950 | } | |
951 | ||
952 | /* A mapping from BFD reloc types to Alpha ELF reloc types. */ | |
953 | ||
954 | struct elf_reloc_map | |
955 | { | |
956 | bfd_reloc_code_real_type bfd_reloc_val; | |
957 | int elf_reloc_val; | |
958 | }; | |
959 | ||
960 | static const struct elf_reloc_map elf64_alpha_reloc_map[] = | |
961 | { | |
962 | {BFD_RELOC_NONE, R_ALPHA_NONE}, | |
963 | {BFD_RELOC_32, R_ALPHA_REFLONG}, | |
964 | {BFD_RELOC_64, R_ALPHA_REFQUAD}, | |
965 | {BFD_RELOC_CTOR, R_ALPHA_REFQUAD}, | |
966 | {BFD_RELOC_GPREL32, R_ALPHA_GPREL32}, | |
967 | {BFD_RELOC_ALPHA_ELF_LITERAL, R_ALPHA_LITERAL}, | |
968 | {BFD_RELOC_ALPHA_LITUSE, R_ALPHA_LITUSE}, | |
969 | {BFD_RELOC_ALPHA_GPDISP, R_ALPHA_GPDISP}, | |
970 | {BFD_RELOC_23_PCREL_S2, R_ALPHA_BRADDR}, | |
971 | {BFD_RELOC_ALPHA_HINT, R_ALPHA_HINT}, | |
972 | {BFD_RELOC_16_PCREL, R_ALPHA_SREL16}, | |
973 | {BFD_RELOC_32_PCREL, R_ALPHA_SREL32}, | |
974 | {BFD_RELOC_64_PCREL, R_ALPHA_SREL64}, | |
975 | }; | |
976 | ||
977 | /* Given a BFD reloc type, return a HOWTO structure. */ | |
978 | ||
979 | static reloc_howto_type * | |
980 | elf64_alpha_bfd_reloc_type_lookup (abfd, code) | |
981 | bfd *abfd; | |
982 | bfd_reloc_code_real_type code; | |
983 | { | |
984 | const struct elf_reloc_map *i, *e; | |
985 | i = e = elf64_alpha_reloc_map; | |
986 | e += sizeof (elf64_alpha_reloc_map) / sizeof (struct elf_reloc_map); | |
987 | for (; i != e; ++i) | |
988 | { | |
989 | if (i->bfd_reloc_val == code) | |
990 | return &elf64_alpha_howto_table[i->elf_reloc_val]; | |
991 | } | |
992 | return 0; | |
993 | } | |
994 | ||
995 | /* Given an Alpha ELF reloc type, fill in an arelent structure. */ | |
996 | ||
997 | static void | |
998 | elf64_alpha_info_to_howto (abfd, cache_ptr, dst) | |
999 | bfd *abfd; | |
1000 | arelent *cache_ptr; | |
1001 | Elf64_Internal_Rela *dst; | |
1002 | { | |
1003 | unsigned r_type; | |
1004 | ||
1005 | r_type = ELF64_R_TYPE(dst->r_info); | |
1006 | BFD_ASSERT (r_type < (unsigned int) R_ALPHA_max); | |
1007 | cache_ptr->howto = &elf64_alpha_howto_table[r_type]; | |
1008 | } | |
1009 | \f | |
1010 | /* These functions do relaxation for Alpha ELF. | |
1011 | ||
1012 | Currently I'm only handling what I can do with existing compiler | |
1013 | and assembler support, which means no instructions are removed, | |
1014 | though some may be nopped. At this time GCC does not emit enough | |
1015 | information to do all of the relaxing that is possible. It will | |
1016 | take some not small amount of work for that to happen. | |
1017 | ||
1018 | There are a couple of interesting papers that I once read on this | |
1019 | subject, that I cannot find references to at the moment, that | |
1020 | related to Alpha in particular. They are by David Wall, then of | |
1021 | DEC WRL. */ | |
1022 | ||
1023 | #define OP_LDA 0x08 | |
1024 | #define OP_LDAH 0x09 | |
1025 | #define INSN_JSR 0x68004000 | |
1026 | #define INSN_JSR_MASK 0xfc00c000 | |
1027 | #define OP_LDQ 0x29 | |
1028 | #define OP_BR 0x30 | |
1029 | #define OP_BSR 0x34 | |
1030 | #define INSN_UNOP 0x2fe00000 | |
1031 | ||
1032 | struct alpha_relax_info | |
1033 | { | |
1034 | bfd *abfd; | |
1035 | asection *sec; | |
1036 | bfd_byte *contents; | |
1037 | Elf_Internal_Rela *relocs, *relend; | |
1038 | struct bfd_link_info *link_info; | |
1039 | boolean changed_contents; | |
1040 | boolean changed_relocs; | |
1041 | bfd_vma gp; | |
1042 | bfd *gotobj; | |
1043 | asection *tsec; | |
1044 | struct alpha_elf_link_hash_entry *h; | |
1045 | struct alpha_elf_got_entry *gotent; | |
1046 | unsigned char other; | |
1047 | }; | |
1048 | ||
1049 | static Elf_Internal_Rela * elf64_alpha_relax_with_lituse | |
1050 | PARAMS((struct alpha_relax_info *info, bfd_vma symval, | |
1051 | Elf_Internal_Rela *irel, Elf_Internal_Rela *irelend)); | |
1052 | ||
1053 | static boolean elf64_alpha_relax_without_lituse | |
1054 | PARAMS((struct alpha_relax_info *info, bfd_vma symval, | |
1055 | Elf_Internal_Rela *irel)); | |
1056 | ||
1057 | static bfd_vma elf64_alpha_relax_opt_call | |
1058 | PARAMS((struct alpha_relax_info *info, bfd_vma symval)); | |
1059 | ||
1060 | static boolean elf64_alpha_relax_section | |
1061 | PARAMS((bfd *abfd, asection *sec, struct bfd_link_info *link_info, | |
1062 | boolean *again)); | |
1063 | ||
1064 | static Elf_Internal_Rela * | |
1065 | elf64_alpha_find_reloc_at_ofs (rel, relend, offset, type) | |
1066 | Elf_Internal_Rela *rel, *relend; | |
1067 | bfd_vma offset; | |
1068 | int type; | |
1069 | { | |
1070 | while (rel < relend) | |
1071 | { | |
1072 | if (rel->r_offset == offset && ELF64_R_TYPE (rel->r_info) == type) | |
1073 | return rel; | |
1074 | ++rel; | |
1075 | } | |
1076 | return NULL; | |
1077 | } | |
1078 | ||
1079 | static Elf_Internal_Rela * | |
1080 | elf64_alpha_relax_with_lituse (info, symval, irel, irelend) | |
1081 | struct alpha_relax_info *info; | |
1082 | bfd_vma symval; | |
1083 | Elf_Internal_Rela *irel, *irelend; | |
1084 | { | |
1085 | Elf_Internal_Rela *urel; | |
1086 | int flags, count, i; | |
1087 | bfd_signed_vma disp; | |
1088 | boolean fits16; | |
1089 | boolean fits32; | |
1090 | boolean lit_reused = false; | |
1091 | boolean all_optimized = true; | |
1092 | unsigned int lit_insn; | |
1093 | ||
1094 | lit_insn = bfd_get_32 (info->abfd, info->contents + irel->r_offset); | |
1095 | if (lit_insn >> 26 != OP_LDQ) | |
1096 | { | |
1097 | ((*_bfd_error_handler) | |
1098 | ("%s: %s+0x%lx: warning: LITERAL relocation against unexpected insn", | |
1099 | bfd_get_filename (info->abfd), info->sec->name, | |
1100 | (unsigned long)irel->r_offset)); | |
1101 | return irel; | |
1102 | } | |
1103 | ||
1104 | /* Summarize how this particular LITERAL is used. */ | |
1105 | for (urel = irel+1, flags = count = 0; urel < irelend; ++urel, ++count) | |
1106 | { | |
1107 | if (ELF64_R_TYPE (urel->r_info) != R_ALPHA_LITUSE) | |
1108 | break; | |
1109 | if (urel->r_addend >= 0 && urel->r_addend <= 3) | |
1110 | flags |= 1 << urel->r_addend; | |
1111 | } | |
1112 | ||
1113 | /* A little preparation for the loop... */ | |
1114 | disp = symval - info->gp; | |
1115 | fits16 = (disp >= -(bfd_signed_vma)0x8000 && disp < 0x8000); | |
1116 | fits32 = (disp >= -(bfd_signed_vma)0x80000000 && disp < 0x7fff8000); | |
1117 | ||
1118 | for (urel = irel+1, i = 0; i < count; ++i, ++urel) | |
1119 | { | |
1120 | unsigned int insn; | |
1121 | insn = bfd_get_32 (info->abfd, info->contents + urel->r_offset); | |
1122 | ||
1123 | switch (urel->r_addend) | |
1124 | { | |
1125 | default: /* 0 = ADDRESS FORMAT */ | |
1126 | /* This type is really just a placeholder to note that all | |
1127 | uses cannot be optimized, but to still allow some. */ | |
1128 | all_optimized = false; | |
1129 | break; | |
1130 | ||
1131 | case 1: /* MEM FORMAT */ | |
1132 | /* We can always optimize 16-bit displacements. */ | |
1133 | if (fits16) | |
1134 | { | |
1135 | /* FIXME: sanity check the insn for mem format with | |
1136 | zero addend. */ | |
1137 | ||
1138 | /* Take the op code and dest from this insn, take the base | |
1139 | register from the literal insn. Leave the offset alone. */ | |
1140 | insn = (insn & 0xffe00000) | (lit_insn & 0x001f0000); | |
1141 | urel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info), | |
1142 | R_ALPHA_GPRELLOW); | |
1143 | urel->r_addend = irel->r_addend; | |
1144 | info->changed_relocs = true; | |
1145 | ||
1146 | bfd_put_32 (info->abfd, insn, info->contents + urel->r_offset); | |
1147 | info->changed_contents = true; | |
1148 | } | |
1149 | ||
1150 | /* If all mem+byte, we can optimize 32-bit mem displacements. */ | |
1151 | else if (fits32 && !(flags & ~6)) | |
1152 | { | |
1153 | /* FIXME: sanity check that lit insn Ra is mem insn Rb, and | |
1154 | that mem_insn disp is zero. */ | |
1155 | ||
1156 | irel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info), | |
1157 | R_ALPHA_GPRELHIGH); | |
1158 | lit_insn = (OP_LDAH << 26) | (lit_insn & 0x03ff0000); | |
1159 | bfd_put_32 (info->abfd, lit_insn, | |
1160 | info->contents + irel->r_offset); | |
1161 | lit_reused = true; | |
1162 | info->changed_contents = true; | |
1163 | ||
1164 | urel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info), | |
1165 | R_ALPHA_GPRELLOW); | |
1166 | urel->r_addend = irel->r_addend; | |
1167 | info->changed_relocs = true; | |
1168 | } | |
1169 | else | |
1170 | all_optimized = false; | |
1171 | break; | |
1172 | ||
1173 | case 2: /* BYTE OFFSET FORMAT */ | |
1174 | /* We can always optimize byte instructions. */ | |
1175 | ||
1176 | /* FIXME: sanity check the insn for byte op. Check that the | |
1177 | literal dest reg is indeed Rb in the byte insn. */ | |
1178 | ||
1179 | insn = (insn & ~0x001ff000) | ((symval & 7) << 13) | 0x1000; | |
1180 | ||
1181 | urel->r_info = ELF64_R_INFO (0, R_ALPHA_NONE); | |
1182 | urel->r_addend = 0; | |
1183 | info->changed_relocs = true; | |
1184 | ||
1185 | bfd_put_32 (info->abfd, insn, info->contents + urel->r_offset); | |
1186 | info->changed_contents = true; | |
1187 | break; | |
1188 | ||
1189 | case 3: /* CALL FORMAT */ | |
1190 | { | |
1191 | /* If not zero, place to jump without needing pv. */ | |
1192 | bfd_vma optdest = elf64_alpha_relax_opt_call (info, symval); | |
1193 | bfd_vma org = (info->sec->output_section->vma | |
1194 | + info->sec->output_offset | |
1195 | + urel->r_offset + 4); | |
1196 | bfd_signed_vma odisp; | |
1197 | ||
1198 | odisp = (optdest ? optdest : symval) - org; | |
1199 | if (odisp >= -0x400000 && odisp < 0x400000) | |
1200 | { | |
1201 | Elf_Internal_Rela *xrel; | |
1202 | ||
1203 | /* Preserve branch prediction call stack when possible. */ | |
1204 | if ((insn & INSN_JSR_MASK) == INSN_JSR) | |
1205 | insn = (OP_BSR << 26) | (insn & 0x03e00000); | |
1206 | else | |
1207 | insn = (OP_BR << 26) | (insn & 0x03e00000); | |
1208 | ||
1209 | urel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info), | |
1210 | R_ALPHA_BRADDR); | |
1211 | urel->r_addend = irel->r_addend; | |
1212 | ||
1213 | if (optdest) | |
1214 | urel->r_addend += optdest - symval; | |
1215 | else | |
1216 | all_optimized = false; | |
1217 | ||
1218 | bfd_put_32 (info->abfd, insn, info->contents + urel->r_offset); | |
1219 | ||
1220 | /* Kill any HINT reloc that might exist for this insn. */ | |
1221 | xrel = (elf64_alpha_find_reloc_at_ofs | |
1222 | (info->relocs, info->relend, urel->r_offset, | |
1223 | R_ALPHA_HINT)); | |
1224 | if (xrel) | |
1225 | xrel->r_info = ELF64_R_INFO (0, R_ALPHA_NONE); | |
1226 | ||
1227 | info->changed_contents = true; | |
1228 | info->changed_relocs = true; | |
1229 | } | |
1230 | else | |
1231 | all_optimized = false; | |
1232 | ||
1233 | /* ??? If target gp == current gp we can eliminate the gp reload. | |
1234 | This does depend on every place a gp could be reloaded will | |
1235 | be, which currently happens for all code produced by gcc, but | |
1236 | not necessarily by hand-coded assembly, or if sibling calls | |
1237 | are enabled in gcc. | |
1238 | ||
1239 | Perhaps conditionalize this on a flag being set in the target | |
1240 | object file's header, and have gcc set it? */ | |
1241 | } | |
1242 | break; | |
1243 | } | |
1244 | } | |
1245 | ||
1246 | /* If all cases were optimized, we can reduce the use count on this | |
1247 | got entry by one, possibly eliminating it. */ | |
1248 | if (all_optimized) | |
1249 | { | |
1250 | info->gotent->use_count -= 1; | |
1251 | alpha_elf_tdata (info->gotent->gotobj)->total_got_entries -= 1; | |
1252 | if (!info->h) | |
1253 | alpha_elf_tdata (info->gotent->gotobj)->n_local_got_entries -= 1; | |
1254 | ||
1255 | /* If the literal instruction is no longer needed (it may have been | |
1256 | reused. We can eliminate it. | |
1257 | ??? For now, I don't want to deal with compacting the section, | |
1258 | so just nop it out. */ | |
1259 | if (!lit_reused) | |
1260 | { | |
1261 | irel->r_info = ELF64_R_INFO (0, R_ALPHA_NONE); | |
1262 | info->changed_relocs = true; | |
1263 | ||
1264 | bfd_put_32 (info->abfd, INSN_UNOP, info->contents + irel->r_offset); | |
1265 | info->changed_contents = true; | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | return irel + count; | |
1270 | } | |
1271 | ||
1272 | static bfd_vma | |
1273 | elf64_alpha_relax_opt_call (info, symval) | |
1274 | struct alpha_relax_info *info; | |
1275 | bfd_vma symval; | |
1276 | { | |
1277 | /* If the function has the same gp, and we can identify that the | |
1278 | function does not use its function pointer, we can eliminate the | |
1279 | address load. */ | |
1280 | ||
1281 | /* If the symbol is marked NOPV, we are being told the function never | |
1282 | needs its procedure value. */ | |
1283 | if (info->other == STO_ALPHA_NOPV) | |
1284 | return symval; | |
1285 | ||
1286 | /* If the symbol is marked STD_GP, we are being told the function does | |
1287 | a normal ldgp in the first two words. */ | |
1288 | else if (info->other == STO_ALPHA_STD_GPLOAD) | |
1289 | ; | |
1290 | ||
1291 | /* Otherwise, we may be able to identify a GP load in the first two | |
1292 | words, which we can then skip. */ | |
1293 | else | |
1294 | { | |
1295 | Elf_Internal_Rela *tsec_relocs, *tsec_relend, *tsec_free, *gpdisp; | |
1296 | bfd_vma ofs; | |
1297 | ||
1298 | /* Load the relocations from the section that the target symbol is in. */ | |
1299 | if (info->sec == info->tsec) | |
1300 | { | |
1301 | tsec_relocs = info->relocs; | |
1302 | tsec_relend = info->relend; | |
1303 | tsec_free = NULL; | |
1304 | } | |
1305 | else | |
1306 | { | |
1307 | tsec_relocs = (_bfd_elf64_link_read_relocs | |
1308 | (info->abfd, info->tsec, (PTR) NULL, | |
1309 | (Elf_Internal_Rela *) NULL, | |
1310 | info->link_info->keep_memory)); | |
1311 | if (tsec_relocs == NULL) | |
1312 | return 0; | |
1313 | tsec_relend = tsec_relocs + info->tsec->reloc_count; | |
1314 | tsec_free = (info->link_info->keep_memory ? NULL : tsec_relocs); | |
1315 | } | |
1316 | ||
1317 | /* Recover the symbol's offset within the section. */ | |
1318 | ofs = (symval - info->tsec->output_section->vma | |
1319 | - info->tsec->output_offset); | |
1320 | ||
1321 | /* Look for a GPDISP reloc. */ | |
1322 | gpdisp = (elf64_alpha_find_reloc_at_ofs | |
1323 | (tsec_relocs, tsec_relend, ofs, R_ALPHA_GPDISP)); | |
1324 | ||
1325 | if (!gpdisp || gpdisp->r_addend != 4) | |
1326 | { | |
1327 | if (tsec_free) | |
1328 | free (tsec_free); | |
1329 | return 0; | |
1330 | } | |
1331 | if (tsec_free) | |
1332 | free (tsec_free); | |
1333 | } | |
1334 | ||
1335 | /* We've now determined that we can skip an initial gp load. Verify | |
1336 | that the call and the target use the same gp. */ | |
1337 | if (info->link_info->hash->creator != info->tsec->owner->xvec | |
1338 | || info->gotobj != alpha_elf_tdata (info->tsec->owner)->gotobj) | |
1339 | return 0; | |
1340 | ||
1341 | return symval + 8; | |
1342 | } | |
1343 | ||
1344 | static boolean | |
1345 | elf64_alpha_relax_without_lituse (info, symval, irel) | |
1346 | struct alpha_relax_info *info; | |
1347 | bfd_vma symval; | |
1348 | Elf_Internal_Rela *irel; | |
1349 | { | |
1350 | unsigned int insn; | |
1351 | bfd_signed_vma disp; | |
1352 | ||
1353 | /* Get the instruction. */ | |
1354 | insn = bfd_get_32 (info->abfd, info->contents + irel->r_offset); | |
1355 | ||
1356 | if (insn >> 26 != OP_LDQ) | |
1357 | { | |
1358 | ((*_bfd_error_handler) | |
1359 | ("%s: %s+0x%lx: warning: LITERAL relocation against unexpected insn", | |
1360 | bfd_get_filename (info->abfd), info->sec->name, | |
1361 | (unsigned long) irel->r_offset)); | |
1362 | return true; | |
1363 | } | |
1364 | ||
1365 | /* So we aren't told much. Do what we can with the address load and | |
1366 | fake the rest. All of the optimizations here require that the | |
1367 | offset from the GP fit in 16 bits. */ | |
1368 | ||
1369 | disp = symval - info->gp; | |
1370 | if (disp < -0x8000 || disp >= 0x8000) | |
1371 | return true; | |
1372 | ||
1373 | /* On the LITERAL instruction itself, consider exchanging | |
1374 | `ldq R,X(gp)' for `lda R,Y(gp)'. */ | |
1375 | ||
1376 | insn = (OP_LDA << 26) | (insn & 0x03ff0000); | |
1377 | bfd_put_32 (info->abfd, insn, info->contents + irel->r_offset); | |
1378 | info->changed_contents = true; | |
1379 | ||
1380 | irel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info), R_ALPHA_GPRELLOW); | |
1381 | info->changed_relocs = true; | |
1382 | ||
1383 | /* Reduce the use count on this got entry by one, possibly | |
1384 | eliminating it. */ | |
1385 | info->gotent->use_count -= 1; | |
1386 | alpha_elf_tdata (info->gotent->gotobj)->total_got_entries -= 1; | |
1387 | if (!info->h) | |
1388 | alpha_elf_tdata (info->gotent->gotobj)->n_local_got_entries -= 1; | |
1389 | ||
1390 | /* ??? Search forward through this basic block looking for insns | |
1391 | that use the target register. Stop after an insn modifying the | |
1392 | register is seen, or after a branch or call. | |
1393 | ||
1394 | Any such memory load insn may be substituted by a load directly | |
1395 | off the GP. This allows the memory load insn to be issued before | |
1396 | the calculated GP register would otherwise be ready. | |
1397 | ||
1398 | Any such jsr insn can be replaced by a bsr if it is in range. | |
1399 | ||
1400 | This would mean that we'd have to _add_ relocations, the pain of | |
1401 | which gives one pause. */ | |
1402 | ||
1403 | return true; | |
1404 | } | |
1405 | ||
1406 | static boolean | |
1407 | elf64_alpha_relax_section (abfd, sec, link_info, again) | |
1408 | bfd *abfd; | |
1409 | asection *sec; | |
1410 | struct bfd_link_info *link_info; | |
1411 | boolean *again; | |
1412 | { | |
1413 | Elf_Internal_Shdr *symtab_hdr; | |
1414 | Elf_Internal_Rela *internal_relocs; | |
1415 | Elf_Internal_Rela *free_relocs = NULL; | |
1416 | Elf_Internal_Rela *irel, *irelend; | |
1417 | bfd_byte *free_contents = NULL; | |
1418 | Elf64_External_Sym *extsyms = NULL; | |
1419 | Elf64_External_Sym *free_extsyms = NULL; | |
1420 | struct alpha_elf_got_entry **local_got_entries; | |
1421 | struct alpha_relax_info info; | |
1422 | ||
1423 | /* We are not currently changing any sizes, so only one pass. */ | |
1424 | *again = false; | |
1425 | ||
1426 | if (link_info->relocateable | |
1427 | || (sec->flags & SEC_RELOC) == 0 | |
1428 | || sec->reloc_count == 0) | |
1429 | return true; | |
1430 | ||
1431 | /* If this is the first time we have been called for this section, | |
1432 | initialize the cooked size. */ | |
1433 | if (sec->_cooked_size == 0) | |
1434 | sec->_cooked_size = sec->_raw_size; | |
1435 | ||
1436 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
1437 | local_got_entries = alpha_elf_tdata(abfd)->local_got_entries; | |
1438 | ||
1439 | /* Load the relocations for this section. */ | |
1440 | internal_relocs = (_bfd_elf64_link_read_relocs | |
1441 | (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, | |
1442 | link_info->keep_memory)); | |
1443 | if (internal_relocs == NULL) | |
1444 | goto error_return; | |
1445 | if (! link_info->keep_memory) | |
1446 | free_relocs = internal_relocs; | |
1447 | ||
1448 | memset(&info, 0, sizeof(info)); | |
1449 | info.abfd = abfd; | |
1450 | info.sec = sec; | |
1451 | info.link_info = link_info; | |
1452 | info.relocs = internal_relocs; | |
1453 | info.relend = irelend = internal_relocs + sec->reloc_count; | |
1454 | ||
1455 | /* Find the GP for this object. */ | |
1456 | info.gotobj = alpha_elf_tdata (abfd)->gotobj; | |
1457 | if (info.gotobj) | |
1458 | { | |
1459 | asection *sgot = alpha_elf_tdata (info.gotobj)->got; | |
1460 | info.gp = _bfd_get_gp_value (info.gotobj); | |
1461 | if (info.gp == 0) | |
1462 | { | |
1463 | info.gp = (sgot->output_section->vma | |
1464 | + sgot->output_offset | |
1465 | + 0x8000); | |
1466 | _bfd_set_gp_value (info.gotobj, info.gp); | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | for (irel = internal_relocs; irel < irelend; irel++) | |
1471 | { | |
1472 | bfd_vma symval; | |
1473 | Elf_Internal_Sym isym; | |
1474 | struct alpha_elf_got_entry *gotent; | |
1475 | ||
1476 | if (ELF64_R_TYPE (irel->r_info) != (int) R_ALPHA_LITERAL) | |
1477 | continue; | |
1478 | ||
1479 | /* Get the section contents. */ | |
1480 | if (info.contents == NULL) | |
1481 | { | |
1482 | if (elf_section_data (sec)->this_hdr.contents != NULL) | |
1483 | info.contents = elf_section_data (sec)->this_hdr.contents; | |
1484 | else | |
1485 | { | |
1486 | info.contents = (bfd_byte *) bfd_malloc (sec->_raw_size); | |
1487 | if (info.contents == NULL) | |
1488 | goto error_return; | |
1489 | free_contents = info.contents; | |
1490 | ||
1491 | if (! bfd_get_section_contents (abfd, sec, info.contents, | |
1492 | (file_ptr) 0, sec->_raw_size)) | |
1493 | goto error_return; | |
1494 | } | |
1495 | } | |
1496 | ||
1497 | /* Read this BFD's symbols if we haven't done so already. */ | |
1498 | if (extsyms == NULL) | |
1499 | { | |
1500 | if (symtab_hdr->contents != NULL) | |
1501 | extsyms = (Elf64_External_Sym *) symtab_hdr->contents; | |
1502 | else | |
1503 | { | |
1504 | extsyms = ((Elf64_External_Sym *) | |
1505 | bfd_malloc (symtab_hdr->sh_size)); | |
1506 | if (extsyms == NULL) | |
1507 | goto error_return; | |
1508 | free_extsyms = extsyms; | |
1509 | if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 | |
1510 | || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) | |
1511 | != symtab_hdr->sh_size)) | |
1512 | goto error_return; | |
1513 | } | |
1514 | } | |
1515 | ||
1516 | /* Get the value of the symbol referred to by the reloc. */ | |
1517 | if (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info) | |
1518 | { | |
1519 | /* A local symbol. */ | |
1520 | bfd_elf64_swap_symbol_in (abfd, | |
1521 | extsyms + ELF64_R_SYM (irel->r_info), | |
1522 | &isym); | |
1523 | if (isym.st_shndx == SHN_UNDEF) | |
1524 | info.tsec = bfd_und_section_ptr; | |
1525 | else if (isym.st_shndx > 0 && isym.st_shndx < SHN_LORESERVE) | |
1526 | info.tsec = bfd_section_from_elf_index (abfd, isym.st_shndx); | |
1527 | else if (isym.st_shndx == SHN_ABS) | |
1528 | info.tsec = bfd_abs_section_ptr; | |
1529 | else if (isym.st_shndx == SHN_COMMON) | |
1530 | info.tsec = bfd_com_section_ptr; | |
1531 | else | |
1532 | continue; /* who knows. */ | |
1533 | ||
1534 | info.h = NULL; | |
1535 | info.other = isym.st_other; | |
1536 | gotent = local_got_entries[ELF64_R_SYM(irel->r_info)]; | |
1537 | symval = isym.st_value; | |
1538 | } | |
1539 | else | |
1540 | { | |
1541 | unsigned long indx; | |
1542 | struct alpha_elf_link_hash_entry *h; | |
1543 | ||
1544 | indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info; | |
1545 | h = alpha_elf_sym_hashes (abfd)[indx]; | |
1546 | BFD_ASSERT (h != NULL); | |
1547 | ||
1548 | while (h->root.root.type == bfd_link_hash_indirect | |
1549 | || h->root.root.type == bfd_link_hash_warning) | |
1550 | h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link; | |
1551 | ||
1552 | /* We can't do anthing with undefined or dynamic symbols. */ | |
1553 | if (h->root.root.type == bfd_link_hash_undefined | |
1554 | || h->root.root.type == bfd_link_hash_undefweak | |
1555 | || alpha_elf_dynamic_symbol_p (&h->root, link_info)) | |
1556 | continue; | |
1557 | ||
1558 | info.h = h; | |
1559 | info.gotent = gotent; | |
1560 | info.tsec = h->root.root.u.def.section; | |
1561 | info.other = h->root.other; | |
1562 | gotent = h->got_entries; | |
1563 | symval = h->root.root.u.def.value; | |
1564 | } | |
1565 | ||
1566 | /* Search for the got entry to be used by this relocation. */ | |
1567 | while (gotent->gotobj != info.gotobj || gotent->addend != irel->r_addend) | |
1568 | gotent = gotent->next; | |
1569 | info.gotent = gotent; | |
1570 | ||
1571 | symval += info.tsec->output_section->vma + info.tsec->output_offset; | |
1572 | symval += irel->r_addend; | |
1573 | ||
1574 | BFD_ASSERT(info.gotent != NULL); | |
1575 | ||
1576 | /* If there exist LITUSE relocations immediately following, this | |
1577 | opens up all sorts of interesting optimizations, because we | |
1578 | now know every location that this address load is used. */ | |
1579 | ||
1580 | if (irel+1 < irelend && ELF64_R_TYPE (irel[1].r_info) == R_ALPHA_LITUSE) | |
1581 | { | |
1582 | irel = elf64_alpha_relax_with_lituse (&info, symval, irel, irelend); | |
1583 | if (irel == NULL) | |
1584 | goto error_return; | |
1585 | } | |
1586 | else | |
1587 | { | |
1588 | if (!elf64_alpha_relax_without_lituse (&info, symval, irel)) | |
1589 | goto error_return; | |
1590 | } | |
1591 | } | |
1592 | ||
1593 | if (!elf64_alpha_size_got_sections (abfd, link_info)) | |
1594 | return false; | |
1595 | ||
1596 | if (info.changed_relocs) | |
1597 | { | |
1598 | elf_section_data (sec)->relocs = internal_relocs; | |
1599 | } | |
1600 | else if (free_relocs != NULL) | |
1601 | { | |
1602 | free (free_relocs); | |
1603 | } | |
1604 | ||
1605 | if (info.changed_contents) | |
1606 | { | |
1607 | elf_section_data (sec)->this_hdr.contents = info.contents; | |
1608 | } | |
1609 | else if (free_contents != NULL) | |
1610 | { | |
1611 | if (! link_info->keep_memory) | |
1612 | free (free_contents); | |
1613 | else | |
1614 | { | |
1615 | /* Cache the section contents for elf_link_input_bfd. */ | |
1616 | elf_section_data (sec)->this_hdr.contents = info.contents; | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | if (free_extsyms != NULL) | |
1621 | { | |
1622 | if (! link_info->keep_memory) | |
1623 | free (free_extsyms); | |
1624 | else | |
1625 | { | |
1626 | /* Cache the symbols for elf_link_input_bfd. */ | |
1627 | symtab_hdr->contents = extsyms; | |
1628 | } | |
1629 | } | |
1630 | ||
1631 | *again = info.changed_contents || info.changed_relocs; | |
1632 | ||
1633 | return true; | |
1634 | ||
1635 | error_return: | |
1636 | if (free_relocs != NULL) | |
1637 | free (free_relocs); | |
1638 | if (free_contents != NULL) | |
1639 | free (free_contents); | |
1640 | if (free_extsyms != NULL) | |
1641 | free (free_extsyms); | |
1642 | return false; | |
1643 | } | |
1644 | \f | |
1645 | /* PLT/GOT Stuff */ | |
1646 | #define PLT_HEADER_SIZE 32 | |
1647 | #define PLT_HEADER_WORD1 0xc3600000 /* br $27,.+4 */ | |
1648 | #define PLT_HEADER_WORD2 0xa77b000c /* ldq $27,12($27) */ | |
1649 | #define PLT_HEADER_WORD3 0x47ff041f /* nop */ | |
1650 | #define PLT_HEADER_WORD4 0x6b7b0000 /* jmp $27,($27) */ | |
1651 | ||
1652 | #define PLT_ENTRY_SIZE 12 | |
1653 | #define PLT_ENTRY_WORD1 0xc3800000 /* br $28, plt0 */ | |
1654 | #define PLT_ENTRY_WORD2 0 | |
1655 | #define PLT_ENTRY_WORD3 0 | |
1656 | ||
1657 | #define MAX_GOT_ENTRIES (64*1024 / 8) | |
1658 | ||
1659 | #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so" | |
1660 | \f | |
1661 | /* Handle an Alpha specific section when reading an object file. This | |
1662 | is called when elfcode.h finds a section with an unknown type. | |
1663 | FIXME: We need to handle the SHF_ALPHA_GPREL flag, but I'm not sure | |
1664 | how to. */ | |
1665 | ||
1666 | static boolean | |
1667 | elf64_alpha_section_from_shdr (abfd, hdr, name) | |
1668 | bfd *abfd; | |
1669 | Elf64_Internal_Shdr *hdr; | |
1670 | char *name; | |
1671 | { | |
1672 | asection *newsect; | |
1673 | ||
1674 | /* There ought to be a place to keep ELF backend specific flags, but | |
1675 | at the moment there isn't one. We just keep track of the | |
1676 | sections by their name, instead. Fortunately, the ABI gives | |
1677 | suggested names for all the MIPS specific sections, so we will | |
1678 | probably get away with this. */ | |
1679 | switch (hdr->sh_type) | |
1680 | { | |
1681 | case SHT_ALPHA_DEBUG: | |
1682 | if (strcmp (name, ".mdebug") != 0) | |
1683 | return false; | |
1684 | break; | |
1685 | #ifdef ERIC_neverdef | |
1686 | case SHT_ALPHA_REGINFO: | |
1687 | if (strcmp (name, ".reginfo") != 0 | |
1688 | || hdr->sh_size != sizeof (Elf64_External_RegInfo)) | |
1689 | return false; | |
1690 | break; | |
1691 | #endif | |
1692 | default: | |
1693 | return false; | |
1694 | } | |
1695 | ||
1696 | if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name)) | |
1697 | return false; | |
1698 | newsect = hdr->bfd_section; | |
1699 | ||
1700 | if (hdr->sh_type == SHT_ALPHA_DEBUG) | |
1701 | { | |
1702 | if (! bfd_set_section_flags (abfd, newsect, | |
1703 | (bfd_get_section_flags (abfd, newsect) | |
1704 | | SEC_DEBUGGING))) | |
1705 | return false; | |
1706 | } | |
1707 | ||
1708 | #ifdef ERIC_neverdef | |
1709 | /* For a .reginfo section, set the gp value in the tdata information | |
1710 | from the contents of this section. We need the gp value while | |
1711 | processing relocs, so we just get it now. */ | |
1712 | if (hdr->sh_type == SHT_ALPHA_REGINFO) | |
1713 | { | |
1714 | Elf64_External_RegInfo ext; | |
1715 | Elf64_RegInfo s; | |
1716 | ||
1717 | if (! bfd_get_section_contents (abfd, newsect, (PTR) &ext, | |
1718 | (file_ptr) 0, sizeof ext)) | |
1719 | return false; | |
1720 | bfd_alpha_elf64_swap_reginfo_in (abfd, &ext, &s); | |
1721 | elf_gp (abfd) = s.ri_gp_value; | |
1722 | } | |
1723 | #endif | |
1724 | ||
1725 | return true; | |
1726 | } | |
1727 | ||
1728 | /* Set the correct type for an Alpha ELF section. We do this by the | |
1729 | section name, which is a hack, but ought to work. */ | |
1730 | ||
1731 | static boolean | |
1732 | elf64_alpha_fake_sections (abfd, hdr, sec) | |
1733 | bfd *abfd; | |
1734 | Elf64_Internal_Shdr *hdr; | |
1735 | asection *sec; | |
1736 | { | |
1737 | register const char *name; | |
1738 | ||
1739 | name = bfd_get_section_name (abfd, sec); | |
1740 | ||
1741 | if (strcmp (name, ".mdebug") == 0) | |
1742 | { | |
1743 | hdr->sh_type = SHT_ALPHA_DEBUG; | |
1744 | /* In a shared object on Irix 5.3, the .mdebug section has an | |
1745 | entsize of 0. FIXME: Does this matter? */ | |
1746 | if ((abfd->flags & DYNAMIC) != 0 ) | |
1747 | hdr->sh_entsize = 0; | |
1748 | else | |
1749 | hdr->sh_entsize = 1; | |
1750 | } | |
1751 | #ifdef ERIC_neverdef | |
1752 | else if (strcmp (name, ".reginfo") == 0) | |
1753 | { | |
1754 | hdr->sh_type = SHT_ALPHA_REGINFO; | |
1755 | /* In a shared object on Irix 5.3, the .reginfo section has an | |
1756 | entsize of 0x18. FIXME: Does this matter? */ | |
1757 | if ((abfd->flags & DYNAMIC) != 0) | |
1758 | hdr->sh_entsize = sizeof (Elf64_External_RegInfo); | |
1759 | else | |
1760 | hdr->sh_entsize = 1; | |
1761 | ||
1762 | /* Force the section size to the correct value, even if the | |
1763 | linker thinks it is larger. The link routine below will only | |
1764 | write out this much data for .reginfo. */ | |
1765 | hdr->sh_size = sec->_raw_size = sizeof (Elf64_External_RegInfo); | |
1766 | } | |
1767 | else if (strcmp (name, ".hash") == 0 | |
1768 | || strcmp (name, ".dynamic") == 0 | |
1769 | || strcmp (name, ".dynstr") == 0) | |
1770 | { | |
1771 | hdr->sh_entsize = 0; | |
1772 | hdr->sh_info = SIZEOF_ALPHA_DYNSYM_SECNAMES; | |
1773 | } | |
1774 | #endif | |
1775 | else if (strcmp (name, ".sdata") == 0 | |
1776 | || strcmp (name, ".sbss") == 0 | |
1777 | || strcmp (name, ".lit4") == 0 | |
1778 | || strcmp (name, ".lit8") == 0) | |
1779 | hdr->sh_flags |= SHF_ALPHA_GPREL; | |
1780 | ||
1781 | return true; | |
1782 | } | |
1783 | ||
1784 | /* Hook called by the linker routine which adds symbols from an object | |
1785 | file. We use it to put .comm items in .sbss, and not .bss. */ | |
1786 | ||
1787 | static boolean | |
1788 | elf64_alpha_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) | |
1789 | bfd *abfd; | |
1790 | struct bfd_link_info *info; | |
1791 | const Elf_Internal_Sym *sym; | |
1792 | const char **namep; | |
1793 | flagword *flagsp; | |
1794 | asection **secp; | |
1795 | bfd_vma *valp; | |
1796 | { | |
1797 | if (sym->st_shndx == SHN_COMMON | |
1798 | && !info->relocateable | |
1799 | && sym->st_size <= bfd_get_gp_size (abfd)) | |
1800 | { | |
1801 | /* Common symbols less than or equal to -G nn bytes are | |
1802 | automatically put into .sbss. */ | |
1803 | ||
1804 | asection *scomm = bfd_get_section_by_name (abfd, ".scommon"); | |
1805 | ||
1806 | if (scomm == NULL) | |
1807 | { | |
1808 | scomm = bfd_make_section (abfd, ".scommon"); | |
1809 | if (scomm == NULL | |
1810 | || !bfd_set_section_flags (abfd, scomm, (SEC_ALLOC | |
1811 | | SEC_IS_COMMON | |
1812 | | SEC_LINKER_CREATED))) | |
1813 | return false; | |
1814 | } | |
1815 | ||
1816 | *secp = scomm; | |
1817 | *valp = sym->st_size; | |
1818 | } | |
1819 | ||
1820 | return true; | |
1821 | } | |
1822 | ||
1823 | /* Create the .got section. */ | |
1824 | ||
1825 | static boolean | |
1826 | elf64_alpha_create_got_section(abfd, info) | |
1827 | bfd *abfd; | |
1828 | struct bfd_link_info *info; | |
1829 | { | |
1830 | asection *s; | |
1831 | ||
1832 | if (bfd_get_section_by_name (abfd, ".got")) | |
1833 | return true; | |
1834 | ||
1835 | s = bfd_make_section (abfd, ".got"); | |
1836 | if (s == NULL | |
1837 | || !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD | |
1838 | | SEC_HAS_CONTENTS | |
1839 | | SEC_IN_MEMORY | |
1840 | | SEC_LINKER_CREATED)) | |
1841 | || !bfd_set_section_alignment (abfd, s, 3)) | |
1842 | return false; | |
1843 | ||
1844 | alpha_elf_tdata (abfd)->got = s; | |
1845 | ||
1846 | return true; | |
1847 | } | |
1848 | ||
1849 | /* Create all the dynamic sections. */ | |
1850 | ||
1851 | static boolean | |
1852 | elf64_alpha_create_dynamic_sections (abfd, info) | |
1853 | bfd *abfd; | |
1854 | struct bfd_link_info *info; | |
1855 | { | |
1856 | asection *s; | |
1857 | struct elf_link_hash_entry *h; | |
1858 | ||
1859 | /* We need to create .plt, .rela.plt, .got, and .rela.got sections. */ | |
1860 | ||
1861 | s = bfd_make_section (abfd, ".plt"); | |
1862 | if (s == NULL | |
1863 | || ! bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD | |
1864 | | SEC_HAS_CONTENTS | |
1865 | | SEC_IN_MEMORY | |
1866 | | SEC_LINKER_CREATED | |
1867 | | SEC_CODE)) | |
1868 | || ! bfd_set_section_alignment (abfd, s, 3)) | |
1869 | return false; | |
1870 | ||
1871 | /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the | |
1872 | .plt section. */ | |
1873 | h = NULL; | |
1874 | if (! (_bfd_generic_link_add_one_symbol | |
1875 | (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, | |
1876 | (bfd_vma) 0, (const char *) NULL, false, | |
1877 | get_elf_backend_data (abfd)->collect, | |
1878 | (struct bfd_link_hash_entry **) &h))) | |
1879 | return false; | |
1880 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
1881 | h->type = STT_OBJECT; | |
1882 | ||
1883 | if (info->shared | |
1884 | && ! _bfd_elf_link_record_dynamic_symbol (info, h)) | |
1885 | return false; | |
1886 | ||
1887 | s = bfd_make_section (abfd, ".rela.plt"); | |
1888 | if (s == NULL | |
1889 | || !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD | |
1890 | | SEC_HAS_CONTENTS | |
1891 | | SEC_IN_MEMORY | |
1892 | | SEC_LINKER_CREATED | |
1893 | | SEC_READONLY)) | |
1894 | || ! bfd_set_section_alignment (abfd, s, 3)) | |
1895 | return false; | |
1896 | ||
1897 | /* We may or may not have created a .got section for this object, but | |
1898 | we definitely havn't done the rest of the work. */ | |
1899 | ||
1900 | if (!elf64_alpha_create_got_section (abfd, info)) | |
1901 | return false; | |
1902 | ||
1903 | s = bfd_make_section(abfd, ".rela.got"); | |
1904 | if (s == NULL | |
1905 | || !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD | |
1906 | | SEC_HAS_CONTENTS | |
1907 | | SEC_IN_MEMORY | |
1908 | | SEC_LINKER_CREATED | |
1909 | | SEC_READONLY)) | |
1910 | || !bfd_set_section_alignment (abfd, s, 3)) | |
1911 | return false; | |
1912 | ||
1913 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the | |
1914 | dynobj's .got section. We don't do this in the linker script | |
1915 | because we don't want to define the symbol if we are not creating | |
1916 | a global offset table. */ | |
1917 | h = NULL; | |
1918 | if (!(_bfd_generic_link_add_one_symbol | |
1919 | (info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL, | |
1920 | alpha_elf_tdata(abfd)->got, (bfd_vma) 0, (const char *) NULL, | |
1921 | false, get_elf_backend_data (abfd)->collect, | |
1922 | (struct bfd_link_hash_entry **) &h))) | |
1923 | return false; | |
1924 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
1925 | h->type = STT_OBJECT; | |
1926 | ||
1927 | if (info->shared | |
1928 | && ! _bfd_elf_link_record_dynamic_symbol (info, h)) | |
1929 | return false; | |
1930 | ||
1931 | elf_hash_table (info)->hgot = h; | |
1932 | ||
1933 | return true; | |
1934 | } | |
1935 | \f | |
1936 | /* Read ECOFF debugging information from a .mdebug section into a | |
1937 | ecoff_debug_info structure. */ | |
1938 | ||
1939 | static boolean | |
1940 | elf64_alpha_read_ecoff_info (abfd, section, debug) | |
1941 | bfd *abfd; | |
1942 | asection *section; | |
1943 | struct ecoff_debug_info *debug; | |
1944 | { | |
1945 | HDRR *symhdr; | |
1946 | const struct ecoff_debug_swap *swap; | |
1947 | char *ext_hdr = NULL; | |
1948 | ||
1949 | swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; | |
1950 | memset (debug, 0, sizeof(*debug)); | |
1951 | ||
1952 | ext_hdr = (char *) bfd_malloc ((size_t) swap->external_hdr_size); | |
1953 | if (ext_hdr == NULL && swap->external_hdr_size != 0) | |
1954 | goto error_return; | |
1955 | ||
1956 | if (bfd_get_section_contents (abfd, section, ext_hdr, (file_ptr) 0, | |
1957 | swap->external_hdr_size) | |
1958 | == false) | |
1959 | goto error_return; | |
1960 | ||
1961 | symhdr = &debug->symbolic_header; | |
1962 | (*swap->swap_hdr_in) (abfd, ext_hdr, symhdr); | |
1963 | ||
1964 | /* The symbolic header contains absolute file offsets and sizes to | |
1965 | read. */ | |
1966 | #define READ(ptr, offset, count, size, type) \ | |
1967 | if (symhdr->count == 0) \ | |
1968 | debug->ptr = NULL; \ | |
1969 | else \ | |
1970 | { \ | |
1971 | debug->ptr = (type) bfd_malloc ((size_t) (size * symhdr->count)); \ | |
1972 | if (debug->ptr == NULL) \ | |
1973 | goto error_return; \ | |
1974 | if (bfd_seek (abfd, (file_ptr) symhdr->offset, SEEK_SET) != 0 \ | |
1975 | || (bfd_read (debug->ptr, size, symhdr->count, \ | |
1976 | abfd) != size * symhdr->count)) \ | |
1977 | goto error_return; \ | |
1978 | } | |
1979 | ||
1980 | READ (line, cbLineOffset, cbLine, sizeof (unsigned char), unsigned char *); | |
1981 | READ (external_dnr, cbDnOffset, idnMax, swap->external_dnr_size, PTR); | |
1982 | READ (external_pdr, cbPdOffset, ipdMax, swap->external_pdr_size, PTR); | |
1983 | READ (external_sym, cbSymOffset, isymMax, swap->external_sym_size, PTR); | |
1984 | READ (external_opt, cbOptOffset, ioptMax, swap->external_opt_size, PTR); | |
1985 | READ (external_aux, cbAuxOffset, iauxMax, sizeof (union aux_ext), | |
1986 | union aux_ext *); | |
1987 | READ (ss, cbSsOffset, issMax, sizeof (char), char *); | |
1988 | READ (ssext, cbSsExtOffset, issExtMax, sizeof (char), char *); | |
1989 | READ (external_fdr, cbFdOffset, ifdMax, swap->external_fdr_size, PTR); | |
1990 | READ (external_rfd, cbRfdOffset, crfd, swap->external_rfd_size, PTR); | |
1991 | READ (external_ext, cbExtOffset, iextMax, swap->external_ext_size, PTR); | |
1992 | #undef READ | |
1993 | ||
1994 | debug->fdr = NULL; | |
1995 | debug->adjust = NULL; | |
1996 | ||
1997 | return true; | |
1998 | ||
1999 | error_return: | |
2000 | if (ext_hdr != NULL) | |
2001 | free (ext_hdr); | |
2002 | if (debug->line != NULL) | |
2003 | free (debug->line); | |
2004 | if (debug->external_dnr != NULL) | |
2005 | free (debug->external_dnr); | |
2006 | if (debug->external_pdr != NULL) | |
2007 | free (debug->external_pdr); | |
2008 | if (debug->external_sym != NULL) | |
2009 | free (debug->external_sym); | |
2010 | if (debug->external_opt != NULL) | |
2011 | free (debug->external_opt); | |
2012 | if (debug->external_aux != NULL) | |
2013 | free (debug->external_aux); | |
2014 | if (debug->ss != NULL) | |
2015 | free (debug->ss); | |
2016 | if (debug->ssext != NULL) | |
2017 | free (debug->ssext); | |
2018 | if (debug->external_fdr != NULL) | |
2019 | free (debug->external_fdr); | |
2020 | if (debug->external_rfd != NULL) | |
2021 | free (debug->external_rfd); | |
2022 | if (debug->external_ext != NULL) | |
2023 | free (debug->external_ext); | |
2024 | return false; | |
2025 | } | |
2026 | ||
2027 | /* Alpha ELF local labels start with '$'. */ | |
2028 | ||
2029 | static boolean | |
2030 | elf64_alpha_is_local_label_name (abfd, name) | |
2031 | bfd *abfd; | |
2032 | const char *name; | |
2033 | { | |
2034 | return name[0] == '$'; | |
2035 | } | |
2036 | ||
2037 | /* Alpha ELF follows MIPS ELF in using a special find_nearest_line | |
2038 | routine in order to handle the ECOFF debugging information. We | |
2039 | still call this mips_elf_find_line because of the slot | |
2040 | find_line_info in elf_obj_tdata is declared that way. */ | |
2041 | ||
2042 | struct mips_elf_find_line | |
2043 | { | |
2044 | struct ecoff_debug_info d; | |
2045 | struct ecoff_find_line i; | |
2046 | }; | |
2047 | ||
2048 | static boolean | |
2049 | elf64_alpha_find_nearest_line (abfd, section, symbols, offset, filename_ptr, | |
2050 | functionname_ptr, line_ptr) | |
2051 | bfd *abfd; | |
2052 | asection *section; | |
2053 | asymbol **symbols; | |
2054 | bfd_vma offset; | |
2055 | const char **filename_ptr; | |
2056 | const char **functionname_ptr; | |
2057 | unsigned int *line_ptr; | |
2058 | { | |
2059 | asection *msec; | |
2060 | ||
2061 | msec = bfd_get_section_by_name (abfd, ".mdebug"); | |
2062 | if (msec != NULL) | |
2063 | { | |
2064 | flagword origflags; | |
2065 | struct mips_elf_find_line *fi; | |
2066 | const struct ecoff_debug_swap * const swap = | |
2067 | get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; | |
2068 | ||
2069 | /* If we are called during a link, alpha_elf_final_link may have | |
2070 | cleared the SEC_HAS_CONTENTS field. We force it back on here | |
2071 | if appropriate (which it normally will be). */ | |
2072 | origflags = msec->flags; | |
2073 | if (elf_section_data (msec)->this_hdr.sh_type != SHT_NOBITS) | |
2074 | msec->flags |= SEC_HAS_CONTENTS; | |
2075 | ||
2076 | fi = elf_tdata (abfd)->find_line_info; | |
2077 | if (fi == NULL) | |
2078 | { | |
2079 | bfd_size_type external_fdr_size; | |
2080 | char *fraw_src; | |
2081 | char *fraw_end; | |
2082 | struct fdr *fdr_ptr; | |
2083 | ||
2084 | fi = ((struct mips_elf_find_line *) | |
2085 | bfd_zalloc (abfd, sizeof (struct mips_elf_find_line))); | |
2086 | if (fi == NULL) | |
2087 | { | |
2088 | msec->flags = origflags; | |
2089 | return false; | |
2090 | } | |
2091 | ||
2092 | if (!elf64_alpha_read_ecoff_info (abfd, msec, &fi->d)) | |
2093 | { | |
2094 | msec->flags = origflags; | |
2095 | return false; | |
2096 | } | |
2097 | ||
2098 | /* Swap in the FDR information. */ | |
2099 | fi->d.fdr = ((struct fdr *) | |
2100 | bfd_alloc (abfd, | |
2101 | (fi->d.symbolic_header.ifdMax * | |
2102 | sizeof (struct fdr)))); | |
2103 | if (fi->d.fdr == NULL) | |
2104 | { | |
2105 | msec->flags = origflags; | |
2106 | return false; | |
2107 | } | |
2108 | external_fdr_size = swap->external_fdr_size; | |
2109 | fdr_ptr = fi->d.fdr; | |
2110 | fraw_src = (char *) fi->d.external_fdr; | |
2111 | fraw_end = (fraw_src | |
2112 | + fi->d.symbolic_header.ifdMax * external_fdr_size); | |
2113 | for (; fraw_src < fraw_end; fraw_src += external_fdr_size, fdr_ptr++) | |
2114 | (*swap->swap_fdr_in) (abfd, (PTR) fraw_src, fdr_ptr); | |
2115 | ||
2116 | elf_tdata (abfd)->find_line_info = fi; | |
2117 | ||
2118 | /* Note that we don't bother to ever free this information. | |
2119 | find_nearest_line is either called all the time, as in | |
2120 | objdump -l, so the information should be saved, or it is | |
2121 | rarely called, as in ld error messages, so the memory | |
2122 | wasted is unimportant. Still, it would probably be a | |
2123 | good idea for free_cached_info to throw it away. */ | |
2124 | } | |
2125 | ||
2126 | if (_bfd_ecoff_locate_line (abfd, section, offset, &fi->d, swap, | |
2127 | &fi->i, filename_ptr, functionname_ptr, | |
2128 | line_ptr)) | |
2129 | { | |
2130 | msec->flags = origflags; | |
2131 | return true; | |
2132 | } | |
2133 | ||
2134 | msec->flags = origflags; | |
2135 | } | |
2136 | ||
2137 | /* Fall back on the generic ELF find_nearest_line routine. */ | |
2138 | ||
2139 | return _bfd_elf_find_nearest_line (abfd, section, symbols, offset, | |
2140 | filename_ptr, functionname_ptr, | |
2141 | line_ptr); | |
2142 | } | |
2143 | \f | |
2144 | /* Structure used to pass information to alpha_elf_output_extsym. */ | |
2145 | ||
2146 | struct extsym_info | |
2147 | { | |
2148 | bfd *abfd; | |
2149 | struct bfd_link_info *info; | |
2150 | struct ecoff_debug_info *debug; | |
2151 | const struct ecoff_debug_swap *swap; | |
2152 | boolean failed; | |
2153 | }; | |
2154 | ||
2155 | static boolean | |
2156 | elf64_alpha_output_extsym (h, data) | |
2157 | struct alpha_elf_link_hash_entry *h; | |
2158 | PTR data; | |
2159 | { | |
2160 | struct extsym_info *einfo = (struct extsym_info *) data; | |
2161 | boolean strip; | |
2162 | asection *sec, *output_section; | |
2163 | ||
2164 | if (h->root.indx == -2) | |
2165 | strip = false; | |
2166 | else if (((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
2167 | || (h->root.elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0) | |
2168 | && (h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
2169 | && (h->root.elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0) | |
2170 | strip = true; | |
2171 | else if (einfo->info->strip == strip_all | |
2172 | || (einfo->info->strip == strip_some | |
2173 | && bfd_hash_lookup (einfo->info->keep_hash, | |
2174 | h->root.root.root.string, | |
2175 | false, false) == NULL)) | |
2176 | strip = true; | |
2177 | else | |
2178 | strip = false; | |
2179 | ||
2180 | if (strip) | |
2181 | return true; | |
2182 | ||
2183 | if (h->esym.ifd == -2) | |
2184 | { | |
2185 | h->esym.jmptbl = 0; | |
2186 | h->esym.cobol_main = 0; | |
2187 | h->esym.weakext = 0; | |
2188 | h->esym.reserved = 0; | |
2189 | h->esym.ifd = ifdNil; | |
2190 | h->esym.asym.value = 0; | |
2191 | h->esym.asym.st = stGlobal; | |
2192 | ||
2193 | if (h->root.root.type != bfd_link_hash_defined | |
2194 | && h->root.root.type != bfd_link_hash_defweak) | |
2195 | h->esym.asym.sc = scAbs; | |
2196 | else | |
2197 | { | |
2198 | const char *name; | |
2199 | ||
2200 | sec = h->root.root.u.def.section; | |
2201 | output_section = sec->output_section; | |
2202 | ||
2203 | /* When making a shared library and symbol h is the one from | |
2204 | the another shared library, OUTPUT_SECTION may be null. */ | |
2205 | if (output_section == NULL) | |
2206 | h->esym.asym.sc = scUndefined; | |
2207 | else | |
2208 | { | |
2209 | name = bfd_section_name (output_section->owner, output_section); | |
2210 | ||
2211 | if (strcmp (name, ".text") == 0) | |
2212 | h->esym.asym.sc = scText; | |
2213 | else if (strcmp (name, ".data") == 0) | |
2214 | h->esym.asym.sc = scData; | |
2215 | else if (strcmp (name, ".sdata") == 0) | |
2216 | h->esym.asym.sc = scSData; | |
2217 | else if (strcmp (name, ".rodata") == 0 | |
2218 | || strcmp (name, ".rdata") == 0) | |
2219 | h->esym.asym.sc = scRData; | |
2220 | else if (strcmp (name, ".bss") == 0) | |
2221 | h->esym.asym.sc = scBss; | |
2222 | else if (strcmp (name, ".sbss") == 0) | |
2223 | h->esym.asym.sc = scSBss; | |
2224 | else if (strcmp (name, ".init") == 0) | |
2225 | h->esym.asym.sc = scInit; | |
2226 | else if (strcmp (name, ".fini") == 0) | |
2227 | h->esym.asym.sc = scFini; | |
2228 | else | |
2229 | h->esym.asym.sc = scAbs; | |
2230 | } | |
2231 | } | |
2232 | ||
2233 | h->esym.asym.reserved = 0; | |
2234 | h->esym.asym.index = indexNil; | |
2235 | } | |
2236 | ||
2237 | if (h->root.root.type == bfd_link_hash_common) | |
2238 | h->esym.asym.value = h->root.root.u.c.size; | |
2239 | else if (h->root.root.type == bfd_link_hash_defined | |
2240 | || h->root.root.type == bfd_link_hash_defweak) | |
2241 | { | |
2242 | if (h->esym.asym.sc == scCommon) | |
2243 | h->esym.asym.sc = scBss; | |
2244 | else if (h->esym.asym.sc == scSCommon) | |
2245 | h->esym.asym.sc = scSBss; | |
2246 | ||
2247 | sec = h->root.root.u.def.section; | |
2248 | output_section = sec->output_section; | |
2249 | if (output_section != NULL) | |
2250 | h->esym.asym.value = (h->root.root.u.def.value | |
2251 | + sec->output_offset | |
2252 | + output_section->vma); | |
2253 | else | |
2254 | h->esym.asym.value = 0; | |
2255 | } | |
2256 | else if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) | |
2257 | { | |
2258 | /* Set type and value for a symbol with a function stub. */ | |
2259 | h->esym.asym.st = stProc; | |
2260 | sec = bfd_get_section_by_name (einfo->abfd, ".plt"); | |
2261 | if (sec == NULL) | |
2262 | h->esym.asym.value = 0; | |
2263 | else | |
2264 | { | |
2265 | output_section = sec->output_section; | |
2266 | if (output_section != NULL) | |
2267 | h->esym.asym.value = (h->root.plt.offset | |
2268 | + sec->output_offset | |
2269 | + output_section->vma); | |
2270 | else | |
2271 | h->esym.asym.value = 0; | |
2272 | } | |
2273 | #if 0 /* FIXME? */ | |
2274 | h->esym.ifd = 0; | |
2275 | #endif | |
2276 | } | |
2277 | ||
2278 | if (! bfd_ecoff_debug_one_external (einfo->abfd, einfo->debug, einfo->swap, | |
2279 | h->root.root.root.string, | |
2280 | &h->esym)) | |
2281 | { | |
2282 | einfo->failed = true; | |
2283 | return false; | |
2284 | } | |
2285 | ||
2286 | return true; | |
2287 | } | |
2288 | ||
2289 | /* FIXME: Create a runtime procedure table from the .mdebug section. | |
2290 | ||
2291 | static boolean | |
2292 | mips_elf_create_procedure_table (handle, abfd, info, s, debug) | |
2293 | PTR handle; | |
2294 | bfd *abfd; | |
2295 | struct bfd_link_info *info; | |
2296 | asection *s; | |
2297 | struct ecoff_debug_info *debug; | |
2298 | */ | |
2299 | \f | |
2300 | /* Handle dynamic relocations when doing an Alpha ELF link. */ | |
2301 | ||
2302 | static boolean | |
2303 | elf64_alpha_check_relocs (abfd, info, sec, relocs) | |
2304 | bfd *abfd; | |
2305 | struct bfd_link_info *info; | |
2306 | asection *sec; | |
2307 | const Elf_Internal_Rela *relocs; | |
2308 | { | |
2309 | bfd *dynobj; | |
2310 | asection *sreloc; | |
2311 | const char *rel_sec_name; | |
2312 | Elf_Internal_Shdr *symtab_hdr; | |
2313 | struct alpha_elf_link_hash_entry **sym_hashes; | |
2314 | struct alpha_elf_got_entry **local_got_entries; | |
2315 | const Elf_Internal_Rela *rel, *relend; | |
2316 | int got_created; | |
2317 | ||
2318 | if (info->relocateable) | |
2319 | return true; | |
2320 | ||
2321 | dynobj = elf_hash_table(info)->dynobj; | |
2322 | if (dynobj == NULL) | |
2323 | elf_hash_table(info)->dynobj = dynobj = abfd; | |
2324 | ||
2325 | sreloc = NULL; | |
2326 | rel_sec_name = NULL; | |
2327 | symtab_hdr = &elf_tdata(abfd)->symtab_hdr; | |
2328 | sym_hashes = alpha_elf_sym_hashes(abfd); | |
2329 | local_got_entries = alpha_elf_tdata(abfd)->local_got_entries; | |
2330 | got_created = 0; | |
2331 | ||
2332 | relend = relocs + sec->reloc_count; | |
2333 | for (rel = relocs; rel < relend; ++rel) | |
2334 | { | |
2335 | unsigned long r_symndx, r_type; | |
2336 | struct alpha_elf_link_hash_entry *h; | |
2337 | ||
2338 | r_symndx = ELF64_R_SYM (rel->r_info); | |
2339 | if (r_symndx < symtab_hdr->sh_info) | |
2340 | h = NULL; | |
2341 | else | |
2342 | { | |
2343 | h = sym_hashes[r_symndx - symtab_hdr->sh_info]; | |
2344 | ||
2345 | while (h->root.root.type == bfd_link_hash_indirect | |
2346 | || h->root.root.type == bfd_link_hash_warning) | |
2347 | h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link; | |
2348 | ||
2349 | h->root.elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR; | |
2350 | } | |
2351 | r_type = ELF64_R_TYPE (rel->r_info); | |
2352 | ||
2353 | switch (r_type) | |
2354 | { | |
2355 | case R_ALPHA_LITERAL: | |
2356 | { | |
2357 | struct alpha_elf_got_entry *gotent; | |
2358 | int flags = 0; | |
2359 | ||
2360 | if (h) | |
2361 | { | |
2362 | /* Search for and possibly create a got entry. */ | |
2363 | for (gotent = h->got_entries; gotent ; gotent = gotent->next) | |
2364 | if (gotent->gotobj == abfd && | |
2365 | gotent->addend == rel->r_addend) | |
2366 | break; | |
2367 | ||
2368 | if (!gotent) | |
2369 | { | |
2370 | gotent = ((struct alpha_elf_got_entry *) | |
2371 | bfd_alloc (abfd, | |
2372 | sizeof (struct alpha_elf_got_entry))); | |
2373 | if (!gotent) | |
2374 | return false; | |
2375 | ||
2376 | gotent->gotobj = abfd; | |
2377 | gotent->addend = rel->r_addend; | |
2378 | gotent->got_offset = -1; | |
2379 | gotent->flags = 0; | |
2380 | gotent->use_count = 1; | |
2381 | ||
2382 | gotent->next = h->got_entries; | |
2383 | h->got_entries = gotent; | |
2384 | ||
2385 | alpha_elf_tdata (abfd)->total_got_entries++; | |
2386 | } | |
2387 | else | |
2388 | gotent->use_count += 1; | |
2389 | } | |
2390 | else | |
2391 | { | |
2392 | /* This is a local .got entry -- record for merge. */ | |
2393 | if (!local_got_entries) | |
2394 | { | |
2395 | size_t size; | |
2396 | size = (symtab_hdr->sh_info | |
2397 | * sizeof (struct alpha_elf_got_entry *)); | |
2398 | ||
2399 | local_got_entries = ((struct alpha_elf_got_entry **) | |
2400 | bfd_alloc (abfd, size)); | |
2401 | if (!local_got_entries) | |
2402 | return false; | |
2403 | ||
2404 | memset (local_got_entries, 0, size); | |
2405 | alpha_elf_tdata (abfd)->local_got_entries = | |
2406 | local_got_entries; | |
2407 | } | |
2408 | ||
2409 | for (gotent = local_got_entries[ELF64_R_SYM(rel->r_info)]; | |
2410 | gotent != NULL && gotent->addend != rel->r_addend; | |
2411 | gotent = gotent->next) | |
2412 | continue; | |
2413 | if (!gotent) | |
2414 | { | |
2415 | gotent = ((struct alpha_elf_got_entry *) | |
2416 | bfd_alloc (abfd, | |
2417 | sizeof (struct alpha_elf_got_entry))); | |
2418 | if (!gotent) | |
2419 | return false; | |
2420 | ||
2421 | gotent->gotobj = abfd; | |
2422 | gotent->addend = rel->r_addend; | |
2423 | gotent->got_offset = -1; | |
2424 | gotent->flags = 0; | |
2425 | gotent->use_count = 1; | |
2426 | ||
2427 | gotent->next = local_got_entries[ELF64_R_SYM(rel->r_info)]; | |
2428 | local_got_entries[ELF64_R_SYM(rel->r_info)] = gotent; | |
2429 | ||
2430 | alpha_elf_tdata(abfd)->total_got_entries++; | |
2431 | alpha_elf_tdata(abfd)->n_local_got_entries++; | |
2432 | } | |
2433 | else | |
2434 | gotent->use_count += 1; | |
2435 | } | |
2436 | ||
2437 | /* Remember how this literal is used from its LITUSEs. | |
2438 | This will be important when it comes to decide if we can | |
2439 | create a .plt entry for a function symbol. */ | |
2440 | if (rel+1 < relend | |
2441 | && ELF64_R_TYPE (rel[1].r_info) == R_ALPHA_LITUSE) | |
2442 | { | |
2443 | do | |
2444 | { | |
2445 | ++rel; | |
2446 | if (rel->r_addend >= 1 && rel->r_addend <= 3) | |
2447 | flags |= 1 << rel->r_addend; | |
2448 | } | |
2449 | while (rel+1 < relend && | |
2450 | ELF64_R_TYPE (rel[1].r_info) == R_ALPHA_LITUSE); | |
2451 | } | |
2452 | else | |
2453 | { | |
2454 | /* No LITUSEs -- presumably the address is not being | |
2455 | loaded for nothing. */ | |
2456 | flags = ALPHA_ELF_LINK_HASH_LU_ADDR; | |
2457 | } | |
2458 | ||
2459 | gotent->flags |= flags; | |
2460 | if (h) | |
2461 | { | |
2462 | /* Make a guess as to whether a .plt entry will be needed. */ | |
2463 | if ((h->flags |= flags) == ALPHA_ELF_LINK_HASH_LU_FUNC) | |
2464 | h->root.elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
2465 | else | |
2466 | h->root.elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
2467 | } | |
2468 | } | |
2469 | /* FALLTHRU */ | |
2470 | ||
2471 | case R_ALPHA_GPDISP: | |
2472 | case R_ALPHA_GPREL32: | |
2473 | case R_ALPHA_GPRELHIGH: | |
2474 | case R_ALPHA_GPRELLOW: | |
2475 | /* We don't actually use the .got here, but the sections must | |
2476 | be created before the linker maps input sections to output | |
2477 | sections. */ | |
2478 | if (!got_created) | |
2479 | { | |
2480 | if (!elf64_alpha_create_got_section (abfd, info)) | |
2481 | return false; | |
2482 | ||
2483 | /* Make sure the object's gotobj is set to itself so | |
2484 | that we default to every object with its own .got. | |
2485 | We'll merge .gots later once we've collected each | |
2486 | object's info. */ | |
2487 | alpha_elf_tdata(abfd)->gotobj = abfd; | |
2488 | ||
2489 | got_created = 1; | |
2490 | } | |
2491 | break; | |
2492 | ||
2493 | case R_ALPHA_SREL16: | |
2494 | case R_ALPHA_SREL32: | |
2495 | case R_ALPHA_SREL64: | |
2496 | if (h == NULL) | |
2497 | break; | |
2498 | /* FALLTHRU */ | |
2499 | ||
2500 | case R_ALPHA_REFLONG: | |
2501 | case R_ALPHA_REFQUAD: | |
2502 | if (rel_sec_name == NULL) | |
2503 | { | |
2504 | rel_sec_name = (bfd_elf_string_from_elf_section | |
2505 | (abfd, elf_elfheader(abfd)->e_shstrndx, | |
2506 | elf_section_data(sec)->rel_hdr.sh_name)); | |
2507 | if (rel_sec_name == NULL) | |
2508 | return false; | |
2509 | ||
2510 | BFD_ASSERT (strncmp (rel_sec_name, ".rela", 5) == 0 | |
2511 | && strcmp (bfd_get_section_name (abfd, sec), | |
2512 | rel_sec_name+5) == 0); | |
2513 | } | |
2514 | ||
2515 | /* We need to create the section here now whether we eventually | |
2516 | use it or not so that it gets mapped to an output section by | |
2517 | the linker. If not used, we'll kill it in | |
2518 | size_dynamic_sections. */ | |
2519 | if (sreloc == NULL) | |
2520 | { | |
2521 | sreloc = bfd_get_section_by_name (dynobj, rel_sec_name); | |
2522 | if (sreloc == NULL) | |
2523 | { | |
2524 | sreloc = bfd_make_section (dynobj, rel_sec_name); | |
2525 | if (sreloc == NULL | |
2526 | || !bfd_set_section_flags (dynobj, sreloc, | |
2527 | (SEC_ALLOC|SEC_LOAD | |
2528 | | SEC_HAS_CONTENTS | |
2529 | | SEC_IN_MEMORY | |
2530 | | SEC_LINKER_CREATED | |
2531 | | SEC_READONLY)) | |
2532 | || !bfd_set_section_alignment (dynobj, sreloc, 3)) | |
2533 | return false; | |
2534 | } | |
2535 | } | |
2536 | ||
2537 | if (h) | |
2538 | { | |
2539 | /* Since we havn't seen all of the input symbols yet, we | |
2540 | don't know whether we'll actually need a dynamic relocation | |
2541 | entry for this reloc. So make a record of it. Once we | |
2542 | find out if this thing needs dynamic relocation we'll | |
2543 | expand the relocation sections by the appropriate amount. */ | |
2544 | ||
2545 | struct alpha_elf_reloc_entry *rent; | |
2546 | ||
2547 | for (rent = h->reloc_entries; rent; rent = rent->next) | |
2548 | if (rent->rtype == r_type && rent->srel == sreloc) | |
2549 | break; | |
2550 | ||
2551 | if (!rent) | |
2552 | { | |
2553 | rent = ((struct alpha_elf_reloc_entry *) | |
2554 | bfd_alloc (abfd, | |
2555 | sizeof (struct alpha_elf_reloc_entry))); | |
2556 | if (!rent) | |
2557 | return false; | |
2558 | ||
2559 | rent->srel = sreloc; | |
2560 | rent->rtype = r_type; | |
2561 | rent->count = 1; | |
2562 | ||
2563 | rent->next = h->reloc_entries; | |
2564 | h->reloc_entries = rent; | |
2565 | } | |
2566 | else | |
2567 | rent->count++; | |
2568 | } | |
2569 | else if (info->shared) | |
2570 | { | |
2571 | /* If this is a shared library, we need a RELATIVE reloc. */ | |
2572 | sreloc->_raw_size += sizeof (Elf64_External_Rela); | |
2573 | } | |
2574 | break; | |
2575 | } | |
2576 | } | |
2577 | ||
2578 | return true; | |
2579 | } | |
2580 | ||
2581 | /* Adjust a symbol defined by a dynamic object and referenced by a | |
2582 | regular object. The current definition is in some section of the | |
2583 | dynamic object, but we're not including those sections. We have to | |
2584 | change the definition to something the rest of the link can | |
2585 | understand. */ | |
2586 | ||
2587 | static boolean | |
2588 | elf64_alpha_adjust_dynamic_symbol (info, h) | |
2589 | struct bfd_link_info *info; | |
2590 | struct elf_link_hash_entry *h; | |
2591 | { | |
2592 | bfd *dynobj; | |
2593 | asection *s; | |
2594 | struct alpha_elf_link_hash_entry *ah; | |
2595 | ||
2596 | dynobj = elf_hash_table(info)->dynobj; | |
2597 | ah = (struct alpha_elf_link_hash_entry *)h; | |
2598 | ||
2599 | /* Now that we've seen all of the input symbols, finalize our decision | |
2600 | about whether this symbol should get a .plt entry. */ | |
2601 | ||
2602 | if (h->root.type != bfd_link_hash_undefweak | |
2603 | && alpha_elf_dynamic_symbol_p (h, info) | |
2604 | && ((h->type == STT_FUNC | |
2605 | && !(ah->flags & ALPHA_ELF_LINK_HASH_LU_ADDR)) | |
2606 | || (h->type == STT_NOTYPE | |
2607 | && ah->flags == ALPHA_ELF_LINK_HASH_LU_FUNC)) | |
2608 | /* Don't prevent otherwise valid programs from linking by attempting | |
2609 | to create a new .got entry somewhere. A Correct Solution would be | |
2610 | to add a new .got section to a new object file and let it be merged | |
2611 | somewhere later. But for now don't bother. */ | |
2612 | && ah->got_entries) | |
2613 | { | |
2614 | h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; | |
2615 | ||
2616 | s = bfd_get_section_by_name(dynobj, ".plt"); | |
2617 | if (!s && !elf64_alpha_create_dynamic_sections (dynobj, info)) | |
2618 | return false; | |
2619 | ||
2620 | /* The first bit of the .plt is reserved. */ | |
2621 | if (s->_raw_size == 0) | |
2622 | s->_raw_size = PLT_HEADER_SIZE; | |
2623 | ||
2624 | h->plt.offset = s->_raw_size; | |
2625 | s->_raw_size += PLT_ENTRY_SIZE; | |
2626 | ||
2627 | /* If this symbol is not defined in a regular file, and we are not | |
2628 | generating a shared library, then set the symbol to the location | |
2629 | in the .plt. This is required to make function pointers compare | |
2630 | equal between the normal executable and the shared library. */ | |
2631 | if (! info->shared | |
2632 | && h->root.type != bfd_link_hash_defweak) | |
2633 | { | |
2634 | h->root.u.def.section = s; | |
2635 | h->root.u.def.value = h->plt.offset; | |
2636 | } | |
2637 | ||
2638 | /* We also need a JMP_SLOT entry in the .rela.plt section. */ | |
2639 | s = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
2640 | BFD_ASSERT (s != NULL); | |
2641 | s->_raw_size += sizeof (Elf64_External_Rela); | |
2642 | ||
2643 | return true; | |
2644 | } | |
2645 | else | |
2646 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; | |
2647 | ||
2648 | /* If this is a weak symbol, and there is a real definition, the | |
2649 | processor independent code will have arranged for us to see the | |
2650 | real definition first, and we can just use the same value. */ | |
2651 | if (h->weakdef != NULL) | |
2652 | { | |
2653 | BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined | |
2654 | || h->weakdef->root.type == bfd_link_hash_defweak); | |
2655 | h->root.u.def.section = h->weakdef->root.u.def.section; | |
2656 | h->root.u.def.value = h->weakdef->root.u.def.value; | |
2657 | return true; | |
2658 | } | |
2659 | ||
2660 | /* This is a reference to a symbol defined by a dynamic object which | |
2661 | is not a function. The Alpha, since it uses .got entries for all | |
2662 | symbols even in regular objects, does not need the hackery of a | |
2663 | .dynbss section and COPY dynamic relocations. */ | |
2664 | ||
2665 | return true; | |
2666 | } | |
2667 | ||
2668 | /* Symbol versioning can create new symbols, and make our old symbols | |
2669 | indirect to the new ones. Consolidate the got and reloc information | |
2670 | in these situations. */ | |
2671 | ||
2672 | static boolean | |
2673 | elf64_alpha_merge_ind_symbols (hi, dummy) | |
2674 | struct alpha_elf_link_hash_entry *hi; | |
2675 | PTR dummy; | |
2676 | { | |
2677 | struct alpha_elf_link_hash_entry *hs; | |
2678 | ||
2679 | if (hi->root.root.type != bfd_link_hash_indirect) | |
2680 | return true; | |
2681 | hs = hi; | |
2682 | do { | |
2683 | hs = (struct alpha_elf_link_hash_entry *)hs->root.root.u.i.link; | |
2684 | } while (hs->root.root.type == bfd_link_hash_indirect); | |
2685 | ||
2686 | /* Merge the flags. Whee. */ | |
2687 | ||
2688 | hs->flags |= hi->flags; | |
2689 | ||
2690 | /* Merge the .got entries. Cannibalize the old symbol's list in | |
2691 | doing so, since we don't need it anymore. */ | |
2692 | ||
2693 | if (hs->got_entries == NULL) | |
2694 | hs->got_entries = hi->got_entries; | |
2695 | else | |
2696 | { | |
2697 | struct alpha_elf_got_entry *gi, *gs, *gin, *gsh; | |
2698 | ||
2699 | gsh = hs->got_entries; | |
2700 | for (gi = hi->got_entries; gi ; gi = gin) | |
2701 | { | |
2702 | gin = gi->next; | |
2703 | for (gs = gsh; gs ; gs = gs->next) | |
2704 | if (gi->gotobj == gs->gotobj && gi->addend == gs->addend) | |
2705 | goto got_found; | |
2706 | gi->next = hs->got_entries; | |
2707 | hs->got_entries = gi; | |
2708 | got_found:; | |
2709 | } | |
2710 | } | |
2711 | hi->got_entries = NULL; | |
2712 | ||
2713 | /* And similar for the reloc entries. */ | |
2714 | ||
2715 | if (hs->reloc_entries == NULL) | |
2716 | hs->reloc_entries = hi->reloc_entries; | |
2717 | else | |
2718 | { | |
2719 | struct alpha_elf_reloc_entry *ri, *rs, *rin, *rsh; | |
2720 | ||
2721 | rsh = hs->reloc_entries; | |
2722 | for (ri = hi->reloc_entries; ri ; ri = rin) | |
2723 | { | |
2724 | rin = ri->next; | |
2725 | for (rs = rsh; rs ; rs = rs->next) | |
2726 | if (ri->rtype == rs->rtype) | |
2727 | { | |
2728 | rs->count += ri->count; | |
2729 | goto found_reloc; | |
2730 | } | |
2731 | ri->next = hs->reloc_entries; | |
2732 | hs->reloc_entries = ri; | |
2733 | found_reloc:; | |
2734 | } | |
2735 | } | |
2736 | hi->reloc_entries = NULL; | |
2737 | ||
2738 | return true; | |
2739 | } | |
2740 | ||
2741 | /* Is it possible to merge two object file's .got tables? */ | |
2742 | ||
2743 | static boolean | |
2744 | elf64_alpha_can_merge_gots (a, b) | |
2745 | bfd *a, *b; | |
2746 | { | |
2747 | int total = alpha_elf_tdata (a)->total_got_entries; | |
2748 | bfd *bsub; | |
2749 | ||
2750 | /* Trivial quick fallout test. */ | |
2751 | if (total + alpha_elf_tdata (b)->total_got_entries <= MAX_GOT_ENTRIES) | |
2752 | return true; | |
2753 | ||
2754 | /* By their nature, local .got entries cannot be merged. */ | |
2755 | if ((total += alpha_elf_tdata (b)->n_local_got_entries) > MAX_GOT_ENTRIES) | |
2756 | return false; | |
2757 | ||
2758 | /* Failing the common trivial comparison, we must effectively | |
2759 | perform the merge. Not actually performing the merge means that | |
2760 | we don't have to store undo information in case we fail. */ | |
2761 | for (bsub = b; bsub ; bsub = alpha_elf_tdata (bsub)->in_got_link_next) | |
2762 | { | |
2763 | struct alpha_elf_link_hash_entry **hashes = alpha_elf_sym_hashes (bsub); | |
2764 | Elf_Internal_Shdr *symtab_hdr = &elf_tdata (bsub)->symtab_hdr; | |
2765 | int i, n; | |
2766 | ||
2767 | n = symtab_hdr->sh_size / symtab_hdr->sh_entsize - symtab_hdr->sh_info; | |
2768 | for (i = 0; i < n; ++i) | |
2769 | { | |
2770 | struct alpha_elf_got_entry *ae, *be; | |
2771 | struct alpha_elf_link_hash_entry *h; | |
2772 | ||
2773 | h = hashes[i]; | |
2774 | while (h->root.root.type == bfd_link_hash_indirect | |
2775 | || h->root.root.type == bfd_link_hash_warning) | |
2776 | h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link; | |
2777 | ||
2778 | for (be = h->got_entries; be ; be = be->next) | |
2779 | { | |
2780 | if (be->use_count == 0) | |
2781 | continue; | |
2782 | if (be->gotobj != b) | |
2783 | continue; | |
2784 | ||
2785 | for (ae = h->got_entries; ae ; ae = ae->next) | |
2786 | if (ae->gotobj == a && ae->addend == be->addend) | |
2787 | goto global_found; | |
2788 | ||
2789 | if (++total > MAX_GOT_ENTRIES) | |
2790 | return false; | |
2791 | global_found:; | |
2792 | } | |
2793 | } | |
2794 | } | |
2795 | ||
2796 | return true; | |
2797 | } | |
2798 | ||
2799 | /* Actually merge two .got tables. */ | |
2800 | ||
2801 | static void | |
2802 | elf64_alpha_merge_gots (a, b) | |
2803 | bfd *a, *b; | |
2804 | { | |
2805 | int total = alpha_elf_tdata (a)->total_got_entries; | |
2806 | bfd *bsub; | |
2807 | ||
2808 | /* Remember local expansion. */ | |
2809 | { | |
2810 | int e = alpha_elf_tdata (b)->n_local_got_entries; | |
2811 | total += e; | |
2812 | alpha_elf_tdata (a)->n_local_got_entries += e; | |
2813 | } | |
2814 | ||
2815 | for (bsub = b; bsub ; bsub = alpha_elf_tdata (bsub)->in_got_link_next) | |
2816 | { | |
2817 | struct alpha_elf_got_entry **local_got_entries; | |
2818 | struct alpha_elf_link_hash_entry **hashes; | |
2819 | Elf_Internal_Shdr *symtab_hdr; | |
2820 | int i, n; | |
2821 | ||
2822 | /* Let the local .got entries know they are part of a new subsegment. */ | |
2823 | local_got_entries = alpha_elf_tdata (bsub)->local_got_entries; | |
2824 | if (local_got_entries) | |
2825 | { | |
2826 | n = elf_tdata (bsub)->symtab_hdr.sh_info; | |
2827 | for (i = 0; i < n; ++i) | |
2828 | { | |
2829 | struct alpha_elf_got_entry *ent; | |
2830 | for (ent = local_got_entries[i]; ent; ent = ent->next) | |
2831 | ent->gotobj = a; | |
2832 | } | |
2833 | } | |
2834 | ||
2835 | /* Merge the global .got entries. */ | |
2836 | hashes = alpha_elf_sym_hashes (bsub); | |
2837 | symtab_hdr = &elf_tdata (bsub)->symtab_hdr; | |
2838 | ||
2839 | n = symtab_hdr->sh_size / symtab_hdr->sh_entsize - symtab_hdr->sh_info; | |
2840 | for (i = 0; i < n; ++i) | |
2841 | { | |
2842 | struct alpha_elf_got_entry *ae, *be, **pbe, **start; | |
2843 | struct alpha_elf_link_hash_entry *h; | |
2844 | ||
2845 | h = hashes[i]; | |
2846 | while (h->root.root.type == bfd_link_hash_indirect | |
2847 | || h->root.root.type == bfd_link_hash_warning) | |
2848 | h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link; | |
2849 | ||
2850 | start = &h->got_entries; | |
2851 | for (pbe = start, be = *start; be ; pbe = &be->next, be = be->next) | |
2852 | { | |
2853 | if (be->use_count == 0) | |
2854 | { | |
2855 | *pbe = be->next; | |
2856 | continue; | |
2857 | } | |
2858 | if (be->gotobj != b) | |
2859 | continue; | |
2860 | ||
2861 | for (ae = *start; ae ; ae = ae->next) | |
2862 | if (ae->gotobj == a && ae->addend == be->addend) | |
2863 | { | |
2864 | ae->flags |= be->flags; | |
2865 | ae->use_count += be->use_count; | |
2866 | *pbe = be->next; | |
2867 | goto global_found; | |
2868 | } | |
2869 | be->gotobj = a; | |
2870 | total += 1; | |
2871 | ||
2872 | global_found:; | |
2873 | } | |
2874 | } | |
2875 | ||
2876 | alpha_elf_tdata (bsub)->gotobj = a; | |
2877 | } | |
2878 | alpha_elf_tdata (a)->total_got_entries = total; | |
2879 | ||
2880 | /* Merge the two in_got chains. */ | |
2881 | { | |
2882 | bfd *next; | |
2883 | ||
2884 | bsub = a; | |
2885 | while ((next = alpha_elf_tdata (bsub)->in_got_link_next) != NULL) | |
2886 | bsub = next; | |
2887 | ||
2888 | alpha_elf_tdata (bsub)->in_got_link_next = b; | |
2889 | } | |
2890 | } | |
2891 | ||
2892 | /* Calculate the offsets for the got entries. */ | |
2893 | ||
2894 | static boolean | |
2895 | elf64_alpha_calc_got_offsets_for_symbol (h, arg) | |
2896 | struct alpha_elf_link_hash_entry *h; | |
2897 | PTR arg; | |
2898 | { | |
2899 | struct alpha_elf_got_entry *gotent; | |
2900 | ||
2901 | for (gotent = h->got_entries; gotent; gotent = gotent->next) | |
2902 | if (gotent->use_count > 0) | |
2903 | { | |
2904 | bfd_size_type *plge | |
2905 | = &alpha_elf_tdata (gotent->gotobj)->got->_raw_size; | |
2906 | ||
2907 | gotent->got_offset = *plge; | |
2908 | *plge += 8; | |
2909 | } | |
2910 | ||
2911 | return true; | |
2912 | } | |
2913 | ||
2914 | static void | |
2915 | elf64_alpha_calc_got_offsets (info) | |
2916 | struct bfd_link_info *info; | |
2917 | { | |
2918 | bfd *i, *got_list = alpha_elf_hash_table(info)->got_list; | |
2919 | ||
2920 | /* First, zero out the .got sizes, as we may be recalculating the | |
2921 | .got after optimizing it. */ | |
2922 | for (i = got_list; i ; i = alpha_elf_tdata(i)->got_link_next) | |
2923 | alpha_elf_tdata(i)->got->_raw_size = 0; | |
2924 | ||
2925 | /* Next, fill in the offsets for all the global entries. */ | |
2926 | alpha_elf_link_hash_traverse (alpha_elf_hash_table (info), | |
2927 | elf64_alpha_calc_got_offsets_for_symbol, | |
2928 | NULL); | |
2929 | ||
2930 | /* Finally, fill in the offsets for the local entries. */ | |
2931 | for (i = got_list; i ; i = alpha_elf_tdata(i)->got_link_next) | |
2932 | { | |
2933 | bfd_size_type got_offset = alpha_elf_tdata(i)->got->_raw_size; | |
2934 | bfd *j; | |
2935 | ||
2936 | for (j = i; j ; j = alpha_elf_tdata(j)->in_got_link_next) | |
2937 | { | |
2938 | struct alpha_elf_got_entry **local_got_entries, *gotent; | |
2939 | int k, n; | |
2940 | ||
2941 | local_got_entries = alpha_elf_tdata(j)->local_got_entries; | |
2942 | if (!local_got_entries) | |
2943 | continue; | |
2944 | ||
2945 | for (k = 0, n = elf_tdata(j)->symtab_hdr.sh_info; k < n; ++k) | |
2946 | for (gotent = local_got_entries[k]; gotent; gotent = gotent->next) | |
2947 | if (gotent->use_count > 0) | |
2948 | { | |
2949 | gotent->got_offset = got_offset; | |
2950 | got_offset += 8; | |
2951 | } | |
2952 | } | |
2953 | ||
2954 | alpha_elf_tdata(i)->got->_raw_size = got_offset; | |
2955 | alpha_elf_tdata(i)->got->_cooked_size = got_offset; | |
2956 | } | |
2957 | } | |
2958 | ||
2959 | /* Constructs the gots. */ | |
2960 | ||
2961 | static boolean | |
2962 | elf64_alpha_size_got_sections (output_bfd, info) | |
2963 | bfd *output_bfd; | |
2964 | struct bfd_link_info *info; | |
2965 | { | |
2966 | bfd *i, *got_list, *cur_got_obj; | |
2967 | int something_changed = 0; | |
2968 | ||
2969 | got_list = alpha_elf_hash_table (info)->got_list; | |
2970 | ||
2971 | /* On the first time through, pretend we have an existing got list | |
2972 | consisting of all of the input files. */ | |
2973 | if (got_list == NULL) | |
2974 | { | |
2975 | for (i = info->input_bfds; i ; i = i->link_next) | |
2976 | { | |
2977 | bfd *this_got = alpha_elf_tdata (i)->gotobj; | |
2978 | if (this_got == NULL) | |
2979 | continue; | |
2980 | ||
2981 | /* We are assuming no merging has yet ocurred. */ | |
2982 | BFD_ASSERT (this_got == i); | |
2983 | ||
2984 | if (alpha_elf_tdata (this_got)->total_got_entries > MAX_GOT_ENTRIES) | |
2985 | { | |
2986 | /* Yikes! A single object file has too many entries. */ | |
2987 | (*_bfd_error_handler) | |
2988 | (_("%s: .got subsegment exceeds 64K (size %d)"), | |
2989 | bfd_get_filename (i), | |
2990 | alpha_elf_tdata (this_got)->total_got_entries * 8); | |
2991 | return false; | |
2992 | } | |
2993 | ||
2994 | if (got_list == NULL) | |
2995 | got_list = this_got; | |
2996 | else | |
2997 | alpha_elf_tdata(cur_got_obj)->got_link_next = this_got; | |
2998 | cur_got_obj = this_got; | |
2999 | } | |
3000 | ||
3001 | /* Strange degenerate case of no got references. */ | |
3002 | if (got_list == NULL) | |
3003 | return true; | |
3004 | ||
3005 | alpha_elf_hash_table (info)->got_list = got_list; | |
3006 | ||
3007 | /* Force got offsets to be recalculated. */ | |
3008 | something_changed = 1; | |
3009 | } | |
3010 | ||
3011 | cur_got_obj = got_list; | |
3012 | i = alpha_elf_tdata(cur_got_obj)->got_link_next; | |
3013 | while (i != NULL) | |
3014 | { | |
3015 | if (elf64_alpha_can_merge_gots (cur_got_obj, i)) | |
3016 | { | |
3017 | elf64_alpha_merge_gots (cur_got_obj, i); | |
3018 | i = alpha_elf_tdata(i)->got_link_next; | |
3019 | alpha_elf_tdata(cur_got_obj)->got_link_next = i; | |
3020 | something_changed = 1; | |
3021 | } | |
3022 | else | |
3023 | { | |
3024 | cur_got_obj = i; | |
3025 | i = alpha_elf_tdata(i)->got_link_next; | |
3026 | } | |
3027 | } | |
3028 | ||
3029 | /* Once the gots have been merged, fill in the got offsets for | |
3030 | everything therein. */ | |
3031 | if (1 || something_changed) | |
3032 | elf64_alpha_calc_got_offsets (info); | |
3033 | ||
3034 | return true; | |
3035 | } | |
3036 | ||
3037 | static boolean | |
3038 | elf64_alpha_always_size_sections (output_bfd, info) | |
3039 | bfd *output_bfd; | |
3040 | struct bfd_link_info *info; | |
3041 | { | |
3042 | bfd *i; | |
3043 | ||
3044 | if (info->relocateable) | |
3045 | return true; | |
3046 | ||
3047 | /* First, take care of the indirect symbols created by versioning. */ | |
3048 | alpha_elf_link_hash_traverse (alpha_elf_hash_table (info), | |
3049 | elf64_alpha_merge_ind_symbols, | |
3050 | NULL); | |
3051 | ||
3052 | if (!elf64_alpha_size_got_sections (output_bfd, info)) | |
3053 | return false; | |
3054 | ||
3055 | /* Allocate space for all of the .got subsections. */ | |
3056 | i = alpha_elf_hash_table (info)->got_list; | |
3057 | for ( ; i ; i = alpha_elf_tdata(i)->got_link_next) | |
3058 | { | |
3059 | asection *s = alpha_elf_tdata(i)->got; | |
3060 | if (s->_raw_size > 0) | |
3061 | { | |
3062 | s->contents = (bfd_byte *) bfd_zalloc (i, s->_raw_size); | |
3063 | if (s->contents == NULL) | |
3064 | return false; | |
3065 | } | |
3066 | } | |
3067 | ||
3068 | return true; | |
3069 | } | |
3070 | ||
3071 | /* Work out the sizes of the dynamic relocation entries. */ | |
3072 | ||
3073 | static boolean | |
3074 | elf64_alpha_calc_dynrel_sizes (h, info) | |
3075 | struct alpha_elf_link_hash_entry *h; | |
3076 | struct bfd_link_info *info; | |
3077 | { | |
3078 | /* If the symbol was defined as a common symbol in a regular object | |
3079 | file, and there was no definition in any dynamic object, then the | |
3080 | linker will have allocated space for the symbol in a common | |
3081 | section but the ELF_LINK_HASH_DEF_REGULAR flag will not have been | |
3082 | set. This is done for dynamic symbols in | |
3083 | elf_adjust_dynamic_symbol but this is not done for non-dynamic | |
3084 | symbols, somehow. */ | |
3085 | if (((h->root.elf_link_hash_flags | |
3086 | & (ELF_LINK_HASH_DEF_REGULAR | |
3087 | | ELF_LINK_HASH_REF_REGULAR | |
3088 | | ELF_LINK_HASH_DEF_DYNAMIC)) | |
3089 | == ELF_LINK_HASH_REF_REGULAR) | |
3090 | && (h->root.root.type == bfd_link_hash_defined | |
3091 | || h->root.root.type == bfd_link_hash_defweak) | |
3092 | && !(h->root.root.u.def.section->owner->flags & DYNAMIC)) | |
3093 | { | |
3094 | h->root.elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
3095 | } | |
3096 | ||
3097 | /* If the symbol is dynamic, we'll need all the relocations in their | |
3098 | natural form. If this is a shared object, and it has been forced | |
3099 | local, we'll need the same number of RELATIVE relocations. */ | |
3100 | ||
3101 | if (alpha_elf_dynamic_symbol_p (&h->root, info) || info->shared) | |
3102 | { | |
3103 | struct alpha_elf_reloc_entry *relent; | |
3104 | bfd *dynobj; | |
3105 | struct alpha_elf_got_entry *gotent; | |
3106 | bfd_size_type count; | |
3107 | asection *srel; | |
3108 | ||
3109 | for (relent = h->reloc_entries; relent; relent = relent->next) | |
3110 | if (relent->rtype == R_ALPHA_REFLONG | |
3111 | || relent->rtype == R_ALPHA_REFQUAD) | |
3112 | { | |
3113 | relent->srel->_raw_size += | |
3114 | sizeof(Elf64_External_Rela) * relent->count; | |
3115 | } | |
3116 | ||
3117 | dynobj = elf_hash_table(info)->dynobj; | |
3118 | count = 0; | |
3119 | ||
3120 | for (gotent = h->got_entries; gotent ; gotent = gotent->next) | |
3121 | count++; | |
3122 | ||
3123 | /* If we are using a .plt entry, subtract one, as the first | |
3124 | reference uses a .rela.plt entry instead. */ | |
3125 | if (h->root.plt.offset != MINUS_ONE) | |
3126 | count--; | |
3127 | ||
3128 | if (count > 0) | |
3129 | { | |
3130 | srel = bfd_get_section_by_name (dynobj, ".rela.got"); | |
3131 | BFD_ASSERT (srel != NULL); | |
3132 | srel->_raw_size += sizeof (Elf64_External_Rela) * count; | |
3133 | } | |
3134 | } | |
3135 | ||
3136 | return true; | |
3137 | } | |
3138 | ||
3139 | /* Set the sizes of the dynamic sections. */ | |
3140 | ||
3141 | static boolean | |
3142 | elf64_alpha_size_dynamic_sections (output_bfd, info) | |
3143 | bfd *output_bfd; | |
3144 | struct bfd_link_info *info; | |
3145 | { | |
3146 | bfd *dynobj; | |
3147 | asection *s; | |
3148 | boolean reltext; | |
3149 | boolean relplt; | |
3150 | ||
3151 | dynobj = elf_hash_table(info)->dynobj; | |
3152 | BFD_ASSERT(dynobj != NULL); | |
3153 | ||
3154 | if (elf_hash_table (info)->dynamic_sections_created) | |
3155 | { | |
3156 | /* Set the contents of the .interp section to the interpreter. */ | |
3157 | if (!info->shared) | |
3158 | { | |
3159 | s = bfd_get_section_by_name (dynobj, ".interp"); | |
3160 | BFD_ASSERT (s != NULL); | |
3161 | s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; | |
3162 | s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; | |
3163 | } | |
3164 | ||
3165 | /* Now that we've seen all of the input files, we can decide which | |
3166 | symbols need dynamic relocation entries and which don't. We've | |
3167 | collected information in check_relocs that we can now apply to | |
3168 | size the dynamic relocation sections. */ | |
3169 | alpha_elf_link_hash_traverse (alpha_elf_hash_table (info), | |
3170 | elf64_alpha_calc_dynrel_sizes, | |
3171 | info); | |
3172 | ||
3173 | /* When building shared libraries, each local .got entry needs a | |
3174 | RELATIVE reloc. */ | |
3175 | if (info->shared) | |
3176 | { | |
3177 | bfd *i; | |
3178 | asection *srel; | |
3179 | bfd_size_type count; | |
3180 | ||
3181 | srel = bfd_get_section_by_name (dynobj, ".rela.got"); | |
3182 | BFD_ASSERT (srel != NULL); | |
3183 | ||
3184 | for (i = alpha_elf_hash_table(info)->got_list, count = 0; | |
3185 | i != NULL; | |
3186 | i = alpha_elf_tdata(i)->got_link_next) | |
3187 | count += alpha_elf_tdata(i)->n_local_got_entries; | |
3188 | ||
3189 | srel->_raw_size += count * sizeof(Elf64_External_Rela); | |
3190 | } | |
3191 | } | |
3192 | /* else we're not dynamic and by definition we don't need such things. */ | |
3193 | ||
3194 | /* The check_relocs and adjust_dynamic_symbol entry points have | |
3195 | determined the sizes of the various dynamic sections. Allocate | |
3196 | memory for them. */ | |
3197 | reltext = false; | |
3198 | relplt = false; | |
3199 | for (s = dynobj->sections; s != NULL; s = s->next) | |
3200 | { | |
3201 | const char *name; | |
3202 | boolean strip; | |
3203 | ||
3204 | if (!(s->flags & SEC_LINKER_CREATED)) | |
3205 | continue; | |
3206 | ||
3207 | /* It's OK to base decisions on the section name, because none | |
3208 | of the dynobj section names depend upon the input files. */ | |
3209 | name = bfd_get_section_name (dynobj, s); | |
3210 | ||
3211 | /* If we don't need this section, strip it from the output file. | |
3212 | This is to handle .rela.bss and .rela.plt. We must create it | |
3213 | in create_dynamic_sections, because it must be created before | |
3214 | the linker maps input sections to output sections. The | |
3215 | linker does that before adjust_dynamic_symbol is called, and | |
3216 | it is that function which decides whether anything needs to | |
3217 | go into these sections. */ | |
3218 | ||
3219 | strip = false; | |
3220 | ||
3221 | if (strncmp (name, ".rela", 5) == 0) | |
3222 | { | |
3223 | strip = (s->_raw_size == 0); | |
3224 | ||
3225 | if (!strip) | |
3226 | { | |
3227 | const char *outname; | |
3228 | asection *target; | |
3229 | ||
3230 | /* If this relocation section applies to a read only | |
3231 | section, then we probably need a DT_TEXTREL entry. */ | |
3232 | outname = bfd_get_section_name (output_bfd, | |
3233 | s->output_section); | |
3234 | target = bfd_get_section_by_name (output_bfd, outname + 5); | |
3235 | if (target != NULL | |
3236 | && (target->flags & SEC_READONLY) != 0 | |
3237 | && (target->flags & SEC_ALLOC) != 0) | |
3238 | reltext = true; | |
3239 | ||
3240 | if (strcmp(name, ".rela.plt") == 0) | |
3241 | relplt = true; | |
3242 | ||
3243 | /* We use the reloc_count field as a counter if we need | |
3244 | to copy relocs into the output file. */ | |
3245 | s->reloc_count = 0; | |
3246 | } | |
3247 | } | |
3248 | else if (strcmp (name, ".plt") != 0) | |
3249 | { | |
3250 | /* It's not one of our dynamic sections, so don't allocate space. */ | |
3251 | continue; | |
3252 | } | |
3253 | ||
3254 | if (strip) | |
3255 | _bfd_strip_section_from_output (s); | |
3256 | else | |
3257 | { | |
3258 | /* Allocate memory for the section contents. */ | |
3259 | s->contents = (bfd_byte *) bfd_zalloc(dynobj, s->_raw_size); | |
3260 | if (s->contents == NULL && s->_raw_size != 0) | |
3261 | return false; | |
3262 | } | |
3263 | } | |
3264 | ||
252b5132 RH |
3265 | if (elf_hash_table (info)->dynamic_sections_created) |
3266 | { | |
3267 | /* Add some entries to the .dynamic section. We fill in the | |
3268 | values later, in elf64_alpha_finish_dynamic_sections, but we | |
3269 | must add the entries now so that we get the correct size for | |
3270 | the .dynamic section. The DT_DEBUG entry is filled in by the | |
3271 | dynamic linker and used by the debugger. */ | |
3272 | if (!info->shared) | |
3273 | { | |
3274 | if (!bfd_elf64_add_dynamic_entry (info, DT_DEBUG, 0)) | |
3275 | return false; | |
3276 | } | |
3277 | ||
3278 | if (! bfd_elf64_add_dynamic_entry (info, DT_PLTGOT, 0)) | |
3279 | return false; | |
3280 | ||
3281 | if (relplt) | |
3282 | { | |
3283 | if (! bfd_elf64_add_dynamic_entry (info, DT_PLTRELSZ, 0) | |
3284 | || ! bfd_elf64_add_dynamic_entry (info, DT_PLTREL, DT_RELA) | |
3285 | || ! bfd_elf64_add_dynamic_entry (info, DT_JMPREL, 0)) | |
3286 | return false; | |
3287 | } | |
3288 | ||
3289 | if (! bfd_elf64_add_dynamic_entry (info, DT_RELA, 0) | |
3290 | || ! bfd_elf64_add_dynamic_entry (info, DT_RELASZ, 0) | |
3291 | || ! bfd_elf64_add_dynamic_entry (info, DT_RELAENT, | |
3292 | sizeof(Elf64_External_Rela))) | |
3293 | return false; | |
3294 | ||
3295 | if (reltext) | |
3296 | { | |
3297 | if (! bfd_elf64_add_dynamic_entry (info, DT_TEXTREL, 0)) | |
3298 | return false; | |
3299 | } | |
3300 | } | |
3301 | ||
3302 | return true; | |
3303 | } | |
3304 | ||
252b5132 RH |
3305 | /* Relocate an Alpha ELF section. */ |
3306 | ||
3307 | static boolean | |
3308 | elf64_alpha_relocate_section (output_bfd, info, input_bfd, input_section, | |
3309 | contents, relocs, local_syms, local_sections) | |
3310 | bfd *output_bfd; | |
3311 | struct bfd_link_info *info; | |
3312 | bfd *input_bfd; | |
3313 | asection *input_section; | |
3314 | bfd_byte *contents; | |
3315 | Elf_Internal_Rela *relocs; | |
3316 | Elf_Internal_Sym *local_syms; | |
3317 | asection **local_sections; | |
3318 | { | |
3319 | Elf_Internal_Shdr *symtab_hdr; | |
3320 | Elf_Internal_Rela *rel; | |
3321 | Elf_Internal_Rela *relend; | |
3322 | asection *sec, *sgot, *srel, *srelgot; | |
3323 | bfd *dynobj, *gotobj; | |
3324 | bfd_vma gp; | |
3325 | ||
3326 | srelgot = srel = NULL; | |
3327 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
3328 | dynobj = elf_hash_table (info)->dynobj; | |
3329 | if (dynobj) | |
3330 | { | |
3331 | srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); | |
3332 | } | |
3333 | ||
3334 | /* Find the gp value for this input bfd. */ | |
3335 | sgot = NULL; | |
3336 | gp = 0; | |
3337 | gotobj = alpha_elf_tdata (input_bfd)->gotobj; | |
3338 | if (gotobj) | |
3339 | { | |
3340 | sgot = alpha_elf_tdata (gotobj)->got; | |
3341 | gp = _bfd_get_gp_value (gotobj); | |
3342 | if (gp == 0) | |
3343 | { | |
3344 | gp = (sgot->output_section->vma | |
3345 | + sgot->output_offset | |
3346 | + 0x8000); | |
3347 | _bfd_set_gp_value (gotobj, gp); | |
3348 | } | |
3349 | } | |
3350 | ||
3351 | rel = relocs; | |
3352 | relend = relocs + input_section->reloc_count; | |
3353 | for (; rel < relend; rel++) | |
3354 | { | |
3355 | int r_type; | |
3356 | reloc_howto_type *howto; | |
3357 | unsigned long r_symndx; | |
3358 | struct alpha_elf_link_hash_entry *h; | |
3359 | Elf_Internal_Sym *sym; | |
3360 | bfd_vma relocation; | |
3361 | bfd_vma addend; | |
3362 | bfd_reloc_status_type r; | |
3363 | ||
3364 | r_type = ELF64_R_TYPE(rel->r_info); | |
3365 | if (r_type < 0 || r_type >= (int) R_ALPHA_max) | |
3366 | { | |
3367 | bfd_set_error (bfd_error_bad_value); | |
3368 | return false; | |
3369 | } | |
3370 | howto = elf64_alpha_howto_table + r_type; | |
3371 | ||
3372 | r_symndx = ELF64_R_SYM(rel->r_info); | |
3373 | ||
3374 | if (info->relocateable) | |
3375 | { | |
3376 | /* This is a relocateable link. We don't have to change | |
3377 | anything, unless the reloc is against a section symbol, | |
3378 | in which case we have to adjust according to where the | |
3379 | section symbol winds up in the output section. */ | |
72b60c23 RH |
3380 | |
3381 | /* The symbol associated with GPDISP and LITUSE is | |
3382 | immaterial. Only the addend is significant. */ | |
3383 | if (r_type == R_ALPHA_GPDISP || r_type == R_ALPHA_LITUSE) | |
3384 | continue; | |
3385 | ||
252b5132 RH |
3386 | if (r_symndx < symtab_hdr->sh_info) |
3387 | { | |
3388 | sym = local_syms + r_symndx; | |
3389 | if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) | |
3390 | { | |
3391 | sec = local_sections[r_symndx]; | |
3392 | rel->r_addend += sec->output_offset + sym->st_value; | |
3393 | } | |
3394 | } | |
3395 | ||
3396 | continue; | |
3397 | } | |
3398 | ||
3399 | /* This is a final link. */ | |
3400 | ||
3401 | h = NULL; | |
3402 | sym = NULL; | |
3403 | sec = NULL; | |
3404 | ||
3405 | if (r_symndx < symtab_hdr->sh_info) | |
3406 | { | |
3407 | sym = local_syms + r_symndx; | |
3408 | sec = local_sections[r_symndx]; | |
3409 | relocation = (sec->output_section->vma | |
3410 | + sec->output_offset | |
3411 | + sym->st_value); | |
3412 | } | |
3413 | else | |
3414 | { | |
3415 | h = alpha_elf_sym_hashes (input_bfd)[r_symndx - symtab_hdr->sh_info]; | |
3416 | ||
3417 | while (h->root.root.type == bfd_link_hash_indirect | |
3418 | || h->root.root.type == bfd_link_hash_warning) | |
3419 | h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link; | |
3420 | ||
3421 | if (h->root.root.type == bfd_link_hash_defined | |
3422 | || h->root.root.type == bfd_link_hash_defweak) | |
3423 | { | |
3424 | sec = h->root.root.u.def.section; | |
3425 | ||
3426 | #if rth_notdef | |
3427 | if ((r_type == R_ALPHA_LITERAL | |
3428 | && elf_hash_table(info)->dynamic_sections_created | |
3429 | && (!info->shared | |
3430 | || !info->symbolic | |
3431 | || !(h->root.elf_link_hash_flags | |
3432 | & ELF_LINK_HASH_DEF_REGULAR))) | |
3433 | || (info->shared | |
3434 | && (!info->symbolic | |
3435 | || !(h->root.elf_link_hash_flags | |
3436 | & ELF_LINK_HASH_DEF_REGULAR)) | |
3437 | && (input_section->flags & SEC_ALLOC) | |
3438 | && (r_type == R_ALPHA_REFLONG | |
3439 | || r_type == R_ALPHA_REFQUAD | |
3440 | || r_type == R_ALPHA_LITERAL))) | |
3441 | { | |
3442 | /* In these cases, we don't need the relocation value. | |
3443 | We check specially because in some obscure cases | |
3444 | sec->output_section will be NULL. */ | |
3445 | relocation = 0; | |
3446 | } | |
3447 | #else | |
3448 | /* FIXME: Are not these obscure cases simply bugs? Let's | |
3449 | get something working and come back to this. */ | |
3450 | if (sec->output_section == NULL) | |
3451 | relocation = 0; | |
3452 | #endif /* rth_notdef */ | |
3453 | else | |
3454 | { | |
3455 | relocation = (h->root.root.u.def.value | |
3456 | + sec->output_section->vma | |
3457 | + sec->output_offset); | |
3458 | } | |
3459 | } | |
3460 | else if (h->root.root.type == bfd_link_hash_undefweak) | |
3461 | relocation = 0; | |
3462 | else if (info->shared && !info->symbolic && !info->no_undefined) | |
3463 | relocation = 0; | |
3464 | else | |
3465 | { | |
3466 | if (!((*info->callbacks->undefined_symbol) | |
3467 | (info, h->root.root.root.string, input_bfd, | |
3468 | input_section, rel->r_offset))) | |
3469 | return false; | |
3470 | relocation = 0; | |
3471 | } | |
3472 | } | |
3473 | addend = rel->r_addend; | |
3474 | ||
3475 | switch (r_type) | |
3476 | { | |
3477 | case R_ALPHA_GPDISP: | |
3478 | { | |
3479 | bfd_byte *p_ldah, *p_lda; | |
3480 | ||
3481 | BFD_ASSERT(gp != 0); | |
3482 | ||
3483 | relocation = (input_section->output_section->vma | |
3484 | + input_section->output_offset | |
3485 | + rel->r_offset); | |
3486 | ||
3487 | p_ldah = contents + rel->r_offset - input_section->vma; | |
3488 | p_lda = p_ldah + rel->r_addend; | |
3489 | ||
3490 | r = elf64_alpha_do_reloc_gpdisp (input_bfd, gp - relocation, | |
3491 | p_ldah, p_lda); | |
3492 | } | |
3493 | break; | |
3494 | ||
3495 | case R_ALPHA_OP_PUSH: | |
3496 | case R_ALPHA_OP_STORE: | |
3497 | case R_ALPHA_OP_PSUB: | |
3498 | case R_ALPHA_OP_PRSHIFT: | |
3499 | /* We hate these silly beasts. */ | |
3500 | abort(); | |
3501 | ||
3502 | case R_ALPHA_LITERAL: | |
3503 | { | |
3504 | struct alpha_elf_got_entry *gotent; | |
3505 | boolean dynamic_symbol; | |
3506 | ||
3507 | BFD_ASSERT(sgot != NULL); | |
3508 | BFD_ASSERT(gp != 0); | |
3509 | ||
3510 | if (h != NULL) | |
3511 | { | |
3512 | gotent = h->got_entries; | |
3513 | dynamic_symbol = alpha_elf_dynamic_symbol_p (&h->root, info); | |
3514 | } | |
3515 | else | |
3516 | { | |
3517 | gotent = (alpha_elf_tdata(input_bfd)-> | |
3518 | local_got_entries[r_symndx]); | |
3519 | dynamic_symbol = false; | |
3520 | } | |
3521 | ||
3522 | BFD_ASSERT(gotent != NULL); | |
3523 | ||
3524 | while (gotent->gotobj != gotobj || gotent->addend != addend) | |
3525 | gotent = gotent->next; | |
3526 | ||
3527 | BFD_ASSERT(gotent->use_count >= 1); | |
3528 | ||
3529 | /* Initialize the .got entry's value. */ | |
3530 | if (!(gotent->flags & ALPHA_ELF_GOT_ENTRY_RELOCS_DONE)) | |
3531 | { | |
3532 | bfd_put_64 (output_bfd, relocation+addend, | |
3533 | sgot->contents + gotent->got_offset); | |
3534 | ||
3535 | /* If the symbol has been forced local, output a | |
3536 | RELATIVE reloc, otherwise it will be handled in | |
3537 | finish_dynamic_symbol. */ | |
3538 | if (info->shared && !dynamic_symbol) | |
3539 | { | |
3540 | Elf_Internal_Rela outrel; | |
3541 | ||
3542 | BFD_ASSERT(srelgot != NULL); | |
3543 | ||
3544 | outrel.r_offset = (sgot->output_section->vma | |
3545 | + sgot->output_offset | |
3546 | + gotent->got_offset); | |
3547 | outrel.r_info = ELF64_R_INFO(0, R_ALPHA_RELATIVE); | |
3548 | outrel.r_addend = 0; | |
3549 | ||
3550 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, | |
3551 | ((Elf64_External_Rela *) | |
3552 | srelgot->contents) | |
3553 | + srelgot->reloc_count++); | |
3554 | BFD_ASSERT (sizeof(Elf64_External_Rela) | |
3555 | * srelgot->reloc_count | |
3556 | <= srelgot->_cooked_size); | |
3557 | } | |
3558 | ||
3559 | gotent->flags |= ALPHA_ELF_GOT_ENTRY_RELOCS_DONE; | |
3560 | } | |
3561 | ||
3562 | /* Figure the gprel relocation. */ | |
3563 | addend = 0; | |
3564 | relocation = (sgot->output_section->vma | |
3565 | + sgot->output_offset | |
3566 | + gotent->got_offset); | |
3567 | relocation -= gp; | |
3568 | } | |
3569 | /* overflow handled by _bfd_final_link_relocate */ | |
3570 | goto default_reloc; | |
3571 | ||
3572 | case R_ALPHA_GPREL32: | |
3573 | case R_ALPHA_GPRELLOW: | |
3574 | BFD_ASSERT(gp != 0); | |
3575 | relocation -= gp; | |
3576 | goto default_reloc; | |
3577 | ||
3578 | case R_ALPHA_GPRELHIGH: | |
3579 | BFD_ASSERT(gp != 0); | |
3580 | relocation -= gp; | |
3581 | relocation += addend; | |
3582 | addend = 0; | |
3583 | relocation = (((bfd_signed_vma) relocation >> 16) | |
3584 | + ((relocation >> 15) & 1)); | |
3585 | goto default_reloc; | |
3586 | ||
3587 | case R_ALPHA_BRADDR: | |
3588 | case R_ALPHA_HINT: | |
3589 | /* The regular PC-relative stuff measures from the start of | |
3590 | the instruction rather than the end. */ | |
3591 | addend -= 4; | |
3592 | goto default_reloc; | |
3593 | ||
3594 | case R_ALPHA_REFLONG: | |
3595 | case R_ALPHA_REFQUAD: | |
3596 | { | |
3597 | Elf_Internal_Rela outrel; | |
3598 | boolean skip; | |
3599 | ||
3600 | /* Careful here to remember RELATIVE relocations for global | |
3601 | variables for symbolic shared objects. */ | |
3602 | ||
3603 | if (h && alpha_elf_dynamic_symbol_p (&h->root, info)) | |
3604 | { | |
3605 | BFD_ASSERT(h->root.dynindx != -1); | |
3606 | outrel.r_info = ELF64_R_INFO(h->root.dynindx, r_type); | |
3607 | outrel.r_addend = addend; | |
3608 | addend = 0, relocation = 0; | |
3609 | } | |
3610 | else if (info->shared) | |
3611 | { | |
3612 | outrel.r_info = ELF64_R_INFO(0, R_ALPHA_RELATIVE); | |
3613 | outrel.r_addend = 0; | |
3614 | } | |
3615 | else | |
3616 | goto default_reloc; | |
3617 | ||
3618 | if (!srel) | |
3619 | { | |
3620 | const char *name; | |
3621 | ||
3622 | name = (bfd_elf_string_from_elf_section | |
3623 | (input_bfd, elf_elfheader(input_bfd)->e_shstrndx, | |
3624 | elf_section_data(input_section)->rel_hdr.sh_name)); | |
3625 | BFD_ASSERT(name != NULL); | |
3626 | ||
3627 | srel = bfd_get_section_by_name (dynobj, name); | |
3628 | BFD_ASSERT(srel != NULL); | |
3629 | } | |
3630 | ||
3631 | skip = false; | |
3632 | ||
3633 | if (elf_section_data (input_section)->stab_info == NULL) | |
3634 | outrel.r_offset = rel->r_offset; | |
3635 | else | |
3636 | { | |
3637 | bfd_vma off; | |
3638 | ||
3639 | off = (_bfd_stab_section_offset | |
3640 | (output_bfd, &elf_hash_table (info)->stab_info, | |
3641 | input_section, | |
3642 | &elf_section_data (input_section)->stab_info, | |
3643 | rel->r_offset)); | |
3644 | if (off == (bfd_vma) -1) | |
3645 | skip = true; | |
3646 | outrel.r_offset = off; | |
3647 | } | |
3648 | ||
3649 | if (! skip) | |
3650 | outrel.r_offset += (input_section->output_section->vma | |
3651 | + input_section->output_offset); | |
3652 | else | |
3653 | memset (&outrel, 0, sizeof outrel); | |
3654 | ||
3655 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, | |
3656 | ((Elf64_External_Rela *) | |
3657 | srel->contents) | |
3658 | + srel->reloc_count++); | |
3659 | BFD_ASSERT (sizeof(Elf64_External_Rela) * srel->reloc_count | |
3660 | <= srel->_cooked_size); | |
3661 | } | |
3662 | goto default_reloc; | |
3663 | ||
3664 | default: | |
3665 | default_reloc: | |
3666 | r = _bfd_final_link_relocate (howto, input_bfd, input_section, | |
3667 | contents, rel->r_offset, relocation, | |
3668 | addend); | |
3669 | break; | |
3670 | } | |
3671 | ||
3672 | switch (r) | |
3673 | { | |
3674 | case bfd_reloc_ok: | |
3675 | break; | |
3676 | ||
3677 | case bfd_reloc_overflow: | |
3678 | { | |
3679 | const char *name; | |
3680 | ||
3681 | if (h != NULL) | |
3682 | name = h->root.root.root.string; | |
3683 | else | |
3684 | { | |
3685 | name = (bfd_elf_string_from_elf_section | |
3686 | (input_bfd, symtab_hdr->sh_link, sym->st_name)); | |
3687 | if (name == NULL) | |
3688 | return false; | |
3689 | if (*name == '\0') | |
3690 | name = bfd_section_name (input_bfd, sec); | |
3691 | } | |
3692 | if (! ((*info->callbacks->reloc_overflow) | |
3693 | (info, name, howto->name, (bfd_vma) 0, | |
3694 | input_bfd, input_section, rel->r_offset))) | |
3695 | return false; | |
3696 | } | |
3697 | break; | |
3698 | ||
3699 | default: | |
3700 | case bfd_reloc_outofrange: | |
3701 | abort (); | |
3702 | } | |
3703 | } | |
3704 | ||
3705 | return true; | |
3706 | } | |
3707 | ||
3708 | /* Finish up dynamic symbol handling. We set the contents of various | |
3709 | dynamic sections here. */ | |
3710 | ||
3711 | static boolean | |
3712 | elf64_alpha_finish_dynamic_symbol (output_bfd, info, h, sym) | |
3713 | bfd *output_bfd; | |
3714 | struct bfd_link_info *info; | |
3715 | struct elf_link_hash_entry *h; | |
3716 | Elf_Internal_Sym *sym; | |
3717 | { | |
3718 | bfd *dynobj = elf_hash_table(info)->dynobj; | |
3719 | ||
3720 | if (h->plt.offset != MINUS_ONE) | |
3721 | { | |
3722 | /* Fill in the .plt entry for this symbol. */ | |
3723 | asection *splt, *sgot, *srel; | |
3724 | Elf_Internal_Rela outrel; | |
3725 | bfd_vma got_addr, plt_addr; | |
3726 | bfd_vma plt_index; | |
3727 | struct alpha_elf_got_entry *gotent; | |
3728 | ||
3729 | BFD_ASSERT (h->dynindx != -1); | |
3730 | ||
3731 | /* The first .got entry will be updated by the .plt with the | |
3732 | address of the target function. */ | |
3733 | gotent = ((struct alpha_elf_link_hash_entry *) h)->got_entries; | |
3734 | BFD_ASSERT (gotent && gotent->addend == 0); | |
3735 | ||
3736 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
3737 | BFD_ASSERT (splt != NULL); | |
3738 | srel = bfd_get_section_by_name (dynobj, ".rela.plt"); | |
3739 | BFD_ASSERT (srel != NULL); | |
3740 | sgot = alpha_elf_tdata (gotent->gotobj)->got; | |
3741 | BFD_ASSERT (sgot != NULL); | |
3742 | ||
3743 | got_addr = (sgot->output_section->vma | |
3744 | + sgot->output_offset | |
3745 | + gotent->got_offset); | |
3746 | plt_addr = (splt->output_section->vma | |
3747 | + splt->output_offset | |
3748 | + h->plt.offset); | |
3749 | ||
3750 | plt_index = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE; | |
3751 | ||
3752 | /* Fill in the entry in the procedure linkage table. */ | |
3753 | { | |
3754 | unsigned insn1, insn2, insn3; | |
3755 | ||
3756 | insn1 = PLT_ENTRY_WORD1 | ((-(h->plt.offset + 4) >> 2) & 0x1fffff); | |
3757 | insn2 = PLT_ENTRY_WORD2; | |
3758 | insn3 = PLT_ENTRY_WORD3; | |
3759 | ||
3760 | bfd_put_32 (output_bfd, insn1, splt->contents + h->plt.offset); | |
3761 | bfd_put_32 (output_bfd, insn2, splt->contents + h->plt.offset + 4); | |
3762 | bfd_put_32 (output_bfd, insn3, splt->contents + h->plt.offset + 8); | |
3763 | } | |
3764 | ||
3765 | /* Fill in the entry in the .rela.plt section. */ | |
3766 | outrel.r_offset = got_addr; | |
3767 | outrel.r_info = ELF64_R_INFO(h->dynindx, R_ALPHA_JMP_SLOT); | |
3768 | outrel.r_addend = 0; | |
3769 | ||
3770 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, | |
3771 | ((Elf64_External_Rela *)srel->contents | |
3772 | + plt_index)); | |
3773 | ||
3774 | if (!(h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) | |
3775 | { | |
3776 | /* Mark the symbol as undefined, rather than as defined in the | |
3777 | .plt section. Leave the value alone. */ | |
3778 | sym->st_shndx = SHN_UNDEF; | |
3779 | } | |
3780 | ||
3781 | /* Fill in the entries in the .got. */ | |
3782 | bfd_put_64 (output_bfd, plt_addr, sgot->contents + gotent->got_offset); | |
3783 | ||
3784 | /* Subsequent .got entries will continue to bounce through the .plt. */ | |
3785 | if (gotent->next) | |
3786 | { | |
3787 | srel = bfd_get_section_by_name (dynobj, ".rela.got"); | |
3788 | BFD_ASSERT (! info->shared || srel != NULL); | |
3789 | ||
3790 | gotent = gotent->next; | |
3791 | do | |
3792 | { | |
3793 | sgot = alpha_elf_tdata(gotent->gotobj)->got; | |
3794 | BFD_ASSERT(sgot != NULL); | |
3795 | BFD_ASSERT(gotent->addend == 0); | |
3796 | ||
3797 | bfd_put_64 (output_bfd, plt_addr, | |
3798 | sgot->contents + gotent->got_offset); | |
3799 | ||
3800 | if (info->shared) | |
3801 | { | |
3802 | outrel.r_offset = (sgot->output_section->vma | |
3803 | + sgot->output_offset | |
3804 | + gotent->got_offset); | |
3805 | outrel.r_info = ELF64_R_INFO(0, R_ALPHA_RELATIVE); | |
3806 | outrel.r_addend = 0; | |
3807 | ||
3808 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, | |
3809 | ((Elf64_External_Rela *) | |
3810 | srel->contents) | |
3811 | + srel->reloc_count++); | |
3812 | BFD_ASSERT (sizeof(Elf64_External_Rela) * srel->reloc_count | |
3813 | <= srel->_cooked_size); | |
3814 | } | |
3815 | ||
3816 | gotent = gotent->next; | |
3817 | } | |
3818 | while (gotent != NULL); | |
3819 | } | |
3820 | } | |
3821 | else if (alpha_elf_dynamic_symbol_p (h, info)) | |
3822 | { | |
3823 | /* Fill in the dynamic relocations for this symbol's .got entries. */ | |
3824 | asection *srel; | |
3825 | Elf_Internal_Rela outrel; | |
3826 | struct alpha_elf_got_entry *gotent; | |
3827 | ||
3828 | srel = bfd_get_section_by_name (dynobj, ".rela.got"); | |
3829 | BFD_ASSERT (srel != NULL); | |
3830 | ||
3831 | outrel.r_info = ELF64_R_INFO (h->dynindx, R_ALPHA_GLOB_DAT); | |
3832 | for (gotent = ((struct alpha_elf_link_hash_entry *) h)->got_entries; | |
3833 | gotent != NULL; | |
3834 | gotent = gotent->next) | |
3835 | { | |
3836 | asection *sgot = alpha_elf_tdata (gotent->gotobj)->got; | |
3837 | outrel.r_offset = (sgot->output_section->vma | |
3838 | + sgot->output_offset | |
3839 | + gotent->got_offset); | |
3840 | outrel.r_addend = gotent->addend; | |
3841 | ||
3842 | bfd_elf64_swap_reloca_out (output_bfd, &outrel, | |
3843 | ((Elf64_External_Rela *)srel->contents | |
3844 | + srel->reloc_count++)); | |
3845 | BFD_ASSERT (sizeof(Elf64_External_Rela) * srel->reloc_count | |
3846 | <= srel->_cooked_size); | |
3847 | } | |
3848 | } | |
3849 | ||
3850 | /* Mark some specially defined symbols as absolute. */ | |
3851 | if (strcmp (h->root.root.string, "_DYNAMIC") == 0 | |
3852 | || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0 | |
3853 | || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0) | |
3854 | sym->st_shndx = SHN_ABS; | |
3855 | ||
3856 | return true; | |
3857 | } | |
3858 | ||
3859 | /* Finish up the dynamic sections. */ | |
3860 | ||
3861 | static boolean | |
3862 | elf64_alpha_finish_dynamic_sections (output_bfd, info) | |
3863 | bfd *output_bfd; | |
3864 | struct bfd_link_info *info; | |
3865 | { | |
3866 | bfd *dynobj; | |
3867 | asection *sdyn; | |
3868 | ||
3869 | dynobj = elf_hash_table (info)->dynobj; | |
3870 | sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); | |
3871 | ||
3872 | if (elf_hash_table (info)->dynamic_sections_created) | |
3873 | { | |
3874 | asection *splt; | |
3875 | Elf64_External_Dyn *dyncon, *dynconend; | |
3876 | ||
3877 | splt = bfd_get_section_by_name (dynobj, ".plt"); | |
3878 | BFD_ASSERT (splt != NULL && sdyn != NULL); | |
3879 | ||
3880 | dyncon = (Elf64_External_Dyn *) sdyn->contents; | |
3881 | dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); | |
3882 | for (; dyncon < dynconend; dyncon++) | |
3883 | { | |
3884 | Elf_Internal_Dyn dyn; | |
3885 | const char *name; | |
3886 | asection *s; | |
3887 | ||
3888 | bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); | |
3889 | ||
3890 | switch (dyn.d_tag) | |
3891 | { | |
3892 | case DT_PLTGOT: | |
3893 | name = ".plt"; | |
3894 | goto get_vma; | |
3895 | case DT_PLTRELSZ: | |
3896 | name = ".rela.plt"; | |
3897 | goto get_size; | |
3898 | case DT_JMPREL: | |
3899 | name = ".rela.plt"; | |
3900 | goto get_vma; | |
3901 | ||
3902 | case DT_RELASZ: | |
3903 | /* My interpretation of the TIS v1.1 ELF document indicates | |
3904 | that RELASZ should not include JMPREL. This is not what | |
3905 | the rest of the BFD does. It is, however, what the | |
3906 | glibc ld.so wants. Do this fixup here until we found | |
3907 | out who is right. */ | |
3908 | s = bfd_get_section_by_name (output_bfd, ".rela.plt"); | |
3909 | if (s) | |
3910 | { | |
3911 | dyn.d_un.d_val -= | |
3912 | (s->_cooked_size ? s->_cooked_size : s->_raw_size); | |
3913 | } | |
3914 | break; | |
3915 | ||
3916 | get_vma: | |
3917 | s = bfd_get_section_by_name (output_bfd, name); | |
3918 | dyn.d_un.d_ptr = (s ? s->vma : 0); | |
3919 | break; | |
3920 | ||
3921 | get_size: | |
3922 | s = bfd_get_section_by_name (output_bfd, name); | |
3923 | dyn.d_un.d_val = | |
3924 | (s->_cooked_size ? s->_cooked_size : s->_raw_size); | |
3925 | break; | |
3926 | } | |
3927 | ||
3928 | bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); | |
3929 | } | |
3930 | ||
3931 | /* Initialize the PLT0 entry */ | |
3932 | if (splt->_raw_size > 0) | |
3933 | { | |
3934 | bfd_put_32 (output_bfd, PLT_HEADER_WORD1, splt->contents); | |
3935 | bfd_put_32 (output_bfd, PLT_HEADER_WORD2, splt->contents + 4); | |
3936 | bfd_put_32 (output_bfd, PLT_HEADER_WORD3, splt->contents + 8); | |
3937 | bfd_put_32 (output_bfd, PLT_HEADER_WORD4, splt->contents + 12); | |
3938 | ||
3939 | /* The next two words will be filled in by ld.so */ | |
3940 | bfd_put_64 (output_bfd, 0, splt->contents + 16); | |
3941 | bfd_put_64 (output_bfd, 0, splt->contents + 24); | |
3942 | ||
3943 | elf_section_data (splt->output_section)->this_hdr.sh_entsize = | |
3944 | PLT_HEADER_SIZE; | |
3945 | } | |
3946 | } | |
3947 | ||
252b5132 RH |
3948 | return true; |
3949 | } | |
3950 | ||
3951 | /* We need to use a special link routine to handle the .reginfo and | |
3952 | the .mdebug sections. We need to merge all instances of these | |
3953 | sections together, not write them all out sequentially. */ | |
3954 | ||
3955 | static boolean | |
3956 | elf64_alpha_final_link (abfd, info) | |
3957 | bfd *abfd; | |
3958 | struct bfd_link_info *info; | |
3959 | { | |
3960 | asection *o; | |
3961 | struct bfd_link_order *p; | |
3962 | asection *reginfo_sec, *mdebug_sec, *gptab_data_sec, *gptab_bss_sec; | |
3963 | struct ecoff_debug_info debug; | |
3964 | const struct ecoff_debug_swap *swap | |
3965 | = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap; | |
3966 | HDRR *symhdr = &debug.symbolic_header; | |
3967 | PTR mdebug_handle = NULL; | |
3968 | ||
3969 | #if 0 | |
3970 | if (++ngots == 2) | |
3971 | { | |
3972 | (*info->callbacks->warning) | |
3973 | (info, _("using multiple gp values"), (char *) NULL, | |
3974 | output_bfd, (asection *) NULL, (bfd_vma) 0); | |
3975 | } | |
3976 | #endif | |
3977 | ||
3978 | /* Go through the sections and collect the .reginfo and .mdebug | |
3979 | information. */ | |
3980 | reginfo_sec = NULL; | |
3981 | mdebug_sec = NULL; | |
3982 | gptab_data_sec = NULL; | |
3983 | gptab_bss_sec = NULL; | |
3984 | for (o = abfd->sections; o != (asection *) NULL; o = o->next) | |
3985 | { | |
3986 | #ifdef ERIC_neverdef | |
3987 | if (strcmp (o->name, ".reginfo") == 0) | |
3988 | { | |
3989 | memset (®info, 0, sizeof reginfo); | |
3990 | ||
3991 | /* We have found the .reginfo section in the output file. | |
3992 | Look through all the link_orders comprising it and merge | |
3993 | the information together. */ | |
3994 | for (p = o->link_order_head; | |
3995 | p != (struct bfd_link_order *) NULL; | |
3996 | p = p->next) | |
3997 | { | |
3998 | asection *input_section; | |
3999 | bfd *input_bfd; | |
4000 | Elf64_External_RegInfo ext; | |
4001 | Elf64_RegInfo sub; | |
4002 | ||
4003 | if (p->type != bfd_indirect_link_order) | |
4004 | { | |
4005 | if (p->type == bfd_fill_link_order) | |
4006 | continue; | |
4007 | abort (); | |
4008 | } | |
4009 | ||
4010 | input_section = p->u.indirect.section; | |
4011 | input_bfd = input_section->owner; | |
4012 | ||
4013 | /* The linker emulation code has probably clobbered the | |
4014 | size to be zero bytes. */ | |
4015 | if (input_section->_raw_size == 0) | |
4016 | input_section->_raw_size = sizeof (Elf64_External_RegInfo); | |
4017 | ||
4018 | if (! bfd_get_section_contents (input_bfd, input_section, | |
4019 | (PTR) &ext, | |
4020 | (file_ptr) 0, | |
4021 | sizeof ext)) | |
4022 | return false; | |
4023 | ||
4024 | bfd_alpha_elf64_swap_reginfo_in (input_bfd, &ext, &sub); | |
4025 | ||
4026 | reginfo.ri_gprmask |= sub.ri_gprmask; | |
4027 | reginfo.ri_cprmask[0] |= sub.ri_cprmask[0]; | |
4028 | reginfo.ri_cprmask[1] |= sub.ri_cprmask[1]; | |
4029 | reginfo.ri_cprmask[2] |= sub.ri_cprmask[2]; | |
4030 | reginfo.ri_cprmask[3] |= sub.ri_cprmask[3]; | |
4031 | ||
4032 | /* ri_gp_value is set by the function | |
4033 | alpha_elf_section_processing when the section is | |
4034 | finally written out. */ | |
4035 | ||
4036 | /* Hack: reset the SEC_HAS_CONTENTS flag so that | |
4037 | elf_link_input_bfd ignores this section. */ | |
4038 | input_section->flags &=~ SEC_HAS_CONTENTS; | |
4039 | } | |
4040 | ||
4041 | /* Force the section size to the value we want. */ | |
4042 | o->_raw_size = sizeof (Elf64_External_RegInfo); | |
4043 | ||
4044 | /* Skip this section later on (I don't think this currently | |
4045 | matters, but someday it might). */ | |
4046 | o->link_order_head = (struct bfd_link_order *) NULL; | |
4047 | ||
4048 | reginfo_sec = o; | |
4049 | } | |
4050 | #endif | |
4051 | ||
4052 | if (strcmp (o->name, ".mdebug") == 0) | |
4053 | { | |
4054 | struct extsym_info einfo; | |
4055 | ||
4056 | /* We have found the .mdebug section in the output file. | |
4057 | Look through all the link_orders comprising it and merge | |
4058 | the information together. */ | |
4059 | symhdr->magic = swap->sym_magic; | |
4060 | /* FIXME: What should the version stamp be? */ | |
4061 | symhdr->vstamp = 0; | |
4062 | symhdr->ilineMax = 0; | |
4063 | symhdr->cbLine = 0; | |
4064 | symhdr->idnMax = 0; | |
4065 | symhdr->ipdMax = 0; | |
4066 | symhdr->isymMax = 0; | |
4067 | symhdr->ioptMax = 0; | |
4068 | symhdr->iauxMax = 0; | |
4069 | symhdr->issMax = 0; | |
4070 | symhdr->issExtMax = 0; | |
4071 | symhdr->ifdMax = 0; | |
4072 | symhdr->crfd = 0; | |
4073 | symhdr->iextMax = 0; | |
4074 | ||
4075 | /* We accumulate the debugging information itself in the | |
4076 | debug_info structure. */ | |
4077 | debug.line = NULL; | |
4078 | debug.external_dnr = NULL; | |
4079 | debug.external_pdr = NULL; | |
4080 | debug.external_sym = NULL; | |
4081 | debug.external_opt = NULL; | |
4082 | debug.external_aux = NULL; | |
4083 | debug.ss = NULL; | |
4084 | debug.ssext = debug.ssext_end = NULL; | |
4085 | debug.external_fdr = NULL; | |
4086 | debug.external_rfd = NULL; | |
4087 | debug.external_ext = debug.external_ext_end = NULL; | |
4088 | ||
4089 | mdebug_handle = bfd_ecoff_debug_init (abfd, &debug, swap, info); | |
4090 | if (mdebug_handle == (PTR) NULL) | |
4091 | return false; | |
4092 | ||
4093 | if (1) | |
4094 | { | |
4095 | asection *s; | |
4096 | EXTR esym; | |
4097 | bfd_vma last; | |
4098 | unsigned int i; | |
4099 | static const char * const name[] = | |
4100 | { | |
4101 | ".text", ".init", ".fini", ".data", | |
4102 | ".rodata", ".sdata", ".sbss", ".bss" | |
4103 | }; | |
4104 | static const int sc[] = { scText, scInit, scFini, scData, | |
4105 | scRData, scSData, scSBss, scBss }; | |
4106 | ||
4107 | esym.jmptbl = 0; | |
4108 | esym.cobol_main = 0; | |
4109 | esym.weakext = 0; | |
4110 | esym.reserved = 0; | |
4111 | esym.ifd = ifdNil; | |
4112 | esym.asym.iss = issNil; | |
4113 | esym.asym.st = stLocal; | |
4114 | esym.asym.reserved = 0; | |
4115 | esym.asym.index = indexNil; | |
4116 | for (i = 0; i < 8; i++) | |
4117 | { | |
4118 | esym.asym.sc = sc[i]; | |
4119 | s = bfd_get_section_by_name (abfd, name[i]); | |
4120 | if (s != NULL) | |
4121 | { | |
4122 | esym.asym.value = s->vma; | |
4123 | last = s->vma + s->_raw_size; | |
4124 | } | |
4125 | else | |
4126 | esym.asym.value = last; | |
4127 | ||
4128 | if (! bfd_ecoff_debug_one_external (abfd, &debug, swap, | |
4129 | name[i], &esym)) | |
4130 | return false; | |
4131 | } | |
4132 | } | |
4133 | ||
4134 | for (p = o->link_order_head; | |
4135 | p != (struct bfd_link_order *) NULL; | |
4136 | p = p->next) | |
4137 | { | |
4138 | asection *input_section; | |
4139 | bfd *input_bfd; | |
4140 | const struct ecoff_debug_swap *input_swap; | |
4141 | struct ecoff_debug_info input_debug; | |
4142 | char *eraw_src; | |
4143 | char *eraw_end; | |
4144 | ||
4145 | if (p->type != bfd_indirect_link_order) | |
4146 | { | |
4147 | if (p->type == bfd_fill_link_order) | |
4148 | continue; | |
4149 | abort (); | |
4150 | } | |
4151 | ||
4152 | input_section = p->u.indirect.section; | |
4153 | input_bfd = input_section->owner; | |
4154 | ||
4155 | if (bfd_get_flavour (input_bfd) != bfd_target_elf_flavour | |
4156 | || (get_elf_backend_data (input_bfd) | |
4157 | ->elf_backend_ecoff_debug_swap) == NULL) | |
4158 | { | |
4159 | /* I don't know what a non ALPHA ELF bfd would be | |
4160 | doing with a .mdebug section, but I don't really | |
4161 | want to deal with it. */ | |
4162 | continue; | |
4163 | } | |
4164 | ||
4165 | input_swap = (get_elf_backend_data (input_bfd) | |
4166 | ->elf_backend_ecoff_debug_swap); | |
4167 | ||
4168 | BFD_ASSERT (p->size == input_section->_raw_size); | |
4169 | ||
4170 | /* The ECOFF linking code expects that we have already | |
4171 | read in the debugging information and set up an | |
4172 | ecoff_debug_info structure, so we do that now. */ | |
4173 | if (!elf64_alpha_read_ecoff_info (input_bfd, input_section, | |
4174 | &input_debug)) | |
4175 | return false; | |
4176 | ||
4177 | if (! (bfd_ecoff_debug_accumulate | |
4178 | (mdebug_handle, abfd, &debug, swap, input_bfd, | |
4179 | &input_debug, input_swap, info))) | |
4180 | return false; | |
4181 | ||
4182 | /* Loop through the external symbols. For each one with | |
4183 | interesting information, try to find the symbol in | |
4184 | the linker global hash table and save the information | |
4185 | for the output external symbols. */ | |
4186 | eraw_src = input_debug.external_ext; | |
4187 | eraw_end = (eraw_src | |
4188 | + (input_debug.symbolic_header.iextMax | |
4189 | * input_swap->external_ext_size)); | |
4190 | for (; | |
4191 | eraw_src < eraw_end; | |
4192 | eraw_src += input_swap->external_ext_size) | |
4193 | { | |
4194 | EXTR ext; | |
4195 | const char *name; | |
4196 | struct alpha_elf_link_hash_entry *h; | |
4197 | ||
4198 | (*input_swap->swap_ext_in) (input_bfd, (PTR) eraw_src, &ext); | |
4199 | if (ext.asym.sc == scNil | |
4200 | || ext.asym.sc == scUndefined | |
4201 | || ext.asym.sc == scSUndefined) | |
4202 | continue; | |
4203 | ||
4204 | name = input_debug.ssext + ext.asym.iss; | |
4205 | h = alpha_elf_link_hash_lookup (alpha_elf_hash_table (info), | |
4206 | name, false, false, true); | |
4207 | if (h == NULL || h->esym.ifd != -2) | |
4208 | continue; | |
4209 | ||
4210 | if (ext.ifd != -1) | |
4211 | { | |
4212 | BFD_ASSERT (ext.ifd | |
4213 | < input_debug.symbolic_header.ifdMax); | |
4214 | ext.ifd = input_debug.ifdmap[ext.ifd]; | |
4215 | } | |
4216 | ||
4217 | h->esym = ext; | |
4218 | } | |
4219 | ||
4220 | /* Free up the information we just read. */ | |
4221 | free (input_debug.line); | |
4222 | free (input_debug.external_dnr); | |
4223 | free (input_debug.external_pdr); | |
4224 | free (input_debug.external_sym); | |
4225 | free (input_debug.external_opt); | |
4226 | free (input_debug.external_aux); | |
4227 | free (input_debug.ss); | |
4228 | free (input_debug.ssext); | |
4229 | free (input_debug.external_fdr); | |
4230 | free (input_debug.external_rfd); | |
4231 | free (input_debug.external_ext); | |
4232 | ||
4233 | /* Hack: reset the SEC_HAS_CONTENTS flag so that | |
4234 | elf_link_input_bfd ignores this section. */ | |
4235 | input_section->flags &=~ SEC_HAS_CONTENTS; | |
4236 | } | |
4237 | ||
4238 | #ifdef ERIC_neverdef | |
4239 | if (info->shared) | |
4240 | { | |
4241 | /* Create .rtproc section. */ | |
4242 | rtproc_sec = bfd_get_section_by_name (abfd, ".rtproc"); | |
4243 | if (rtproc_sec == NULL) | |
4244 | { | |
4245 | flagword flags = (SEC_HAS_CONTENTS | |
4246 | | SEC_IN_MEMORY | |
4247 | | SEC_LINKER_CREATED | |
4248 | | SEC_READONLY); | |
4249 | ||
4250 | rtproc_sec = bfd_make_section (abfd, ".rtproc"); | |
4251 | if (rtproc_sec == NULL | |
4252 | || ! bfd_set_section_flags (abfd, rtproc_sec, flags) | |
4253 | || ! bfd_set_section_alignment (abfd, rtproc_sec, 12)) | |
4254 | return false; | |
4255 | } | |
4256 | ||
4257 | if (! alpha_elf_create_procedure_table (mdebug_handle, abfd, | |
4258 | info, rtproc_sec, &debug)) | |
4259 | return false; | |
4260 | } | |
4261 | #endif | |
4262 | ||
4263 | ||
4264 | /* Build the external symbol information. */ | |
4265 | einfo.abfd = abfd; | |
4266 | einfo.info = info; | |
4267 | einfo.debug = &debug; | |
4268 | einfo.swap = swap; | |
4269 | einfo.failed = false; | |
4270 | elf_link_hash_traverse (elf_hash_table (info), | |
4271 | elf64_alpha_output_extsym, | |
4272 | (PTR) &einfo); | |
4273 | if (einfo.failed) | |
4274 | return false; | |
4275 | ||
4276 | /* Set the size of the .mdebug section. */ | |
4277 | o->_raw_size = bfd_ecoff_debug_size (abfd, &debug, swap); | |
4278 | ||
4279 | /* Skip this section later on (I don't think this currently | |
4280 | matters, but someday it might). */ | |
4281 | o->link_order_head = (struct bfd_link_order *) NULL; | |
4282 | ||
4283 | mdebug_sec = o; | |
4284 | } | |
4285 | ||
4286 | #ifdef ERIC_neverdef | |
4287 | if (strncmp (o->name, ".gptab.", sizeof ".gptab." - 1) == 0) | |
4288 | { | |
4289 | const char *subname; | |
4290 | unsigned int c; | |
4291 | Elf64_gptab *tab; | |
4292 | Elf64_External_gptab *ext_tab; | |
4293 | unsigned int i; | |
4294 | ||
4295 | /* The .gptab.sdata and .gptab.sbss sections hold | |
4296 | information describing how the small data area would | |
4297 | change depending upon the -G switch. These sections | |
4298 | not used in executables files. */ | |
4299 | if (! info->relocateable) | |
4300 | { | |
4301 | asection **secpp; | |
4302 | ||
4303 | for (p = o->link_order_head; | |
4304 | p != (struct bfd_link_order *) NULL; | |
4305 | p = p->next) | |
4306 | { | |
4307 | asection *input_section; | |
4308 | ||
4309 | if (p->type != bfd_indirect_link_order) | |
4310 | { | |
4311 | if (p->type == bfd_fill_link_order) | |
4312 | continue; | |
4313 | abort (); | |
4314 | } | |
4315 | ||
4316 | input_section = p->u.indirect.section; | |
4317 | ||
4318 | /* Hack: reset the SEC_HAS_CONTENTS flag so that | |
4319 | elf_link_input_bfd ignores this section. */ | |
4320 | input_section->flags &=~ SEC_HAS_CONTENTS; | |
4321 | } | |
4322 | ||
4323 | /* Skip this section later on (I don't think this | |
4324 | currently matters, but someday it might). */ | |
4325 | o->link_order_head = (struct bfd_link_order *) NULL; | |
4326 | ||
4327 | /* Really remove the section. */ | |
4328 | for (secpp = &abfd->sections; | |
4329 | *secpp != o; | |
4330 | secpp = &(*secpp)->next) | |
4331 | ; | |
4332 | *secpp = (*secpp)->next; | |
4333 | --abfd->section_count; | |
4334 | ||
4335 | continue; | |
4336 | } | |
4337 | ||
4338 | /* There is one gptab for initialized data, and one for | |
4339 | uninitialized data. */ | |
4340 | if (strcmp (o->name, ".gptab.sdata") == 0) | |
4341 | gptab_data_sec = o; | |
4342 | else if (strcmp (o->name, ".gptab.sbss") == 0) | |
4343 | gptab_bss_sec = o; | |
4344 | else | |
4345 | { | |
4346 | (*_bfd_error_handler) | |
4347 | (_("%s: illegal section name `%s'"), | |
4348 | bfd_get_filename (abfd), o->name); | |
4349 | bfd_set_error (bfd_error_nonrepresentable_section); | |
4350 | return false; | |
4351 | } | |
4352 | ||
4353 | /* The linker script always combines .gptab.data and | |
4354 | .gptab.sdata into .gptab.sdata, and likewise for | |
4355 | .gptab.bss and .gptab.sbss. It is possible that there is | |
4356 | no .sdata or .sbss section in the output file, in which | |
4357 | case we must change the name of the output section. */ | |
4358 | subname = o->name + sizeof ".gptab" - 1; | |
4359 | if (bfd_get_section_by_name (abfd, subname) == NULL) | |
4360 | { | |
4361 | if (o == gptab_data_sec) | |
4362 | o->name = ".gptab.data"; | |
4363 | else | |
4364 | o->name = ".gptab.bss"; | |
4365 | subname = o->name + sizeof ".gptab" - 1; | |
4366 | BFD_ASSERT (bfd_get_section_by_name (abfd, subname) != NULL); | |
4367 | } | |
4368 | ||
4369 | /* Set up the first entry. */ | |
4370 | c = 1; | |
4371 | tab = (Elf64_gptab *) bfd_malloc (c * sizeof (Elf64_gptab)); | |
4372 | if (tab == NULL) | |
4373 | return false; | |
4374 | tab[0].gt_header.gt_current_g_value = elf_gp_size (abfd); | |
4375 | tab[0].gt_header.gt_unused = 0; | |
4376 | ||
4377 | /* Combine the input sections. */ | |
4378 | for (p = o->link_order_head; | |
4379 | p != (struct bfd_link_order *) NULL; | |
4380 | p = p->next) | |
4381 | { | |
4382 | asection *input_section; | |
4383 | bfd *input_bfd; | |
4384 | bfd_size_type size; | |
4385 | unsigned long last; | |
4386 | bfd_size_type gpentry; | |
4387 | ||
4388 | if (p->type != bfd_indirect_link_order) | |
4389 | { | |
4390 | if (p->type == bfd_fill_link_order) | |
4391 | continue; | |
4392 | abort (); | |
4393 | } | |
4394 | ||
4395 | input_section = p->u.indirect.section; | |
4396 | input_bfd = input_section->owner; | |
4397 | ||
4398 | /* Combine the gptab entries for this input section one | |
4399 | by one. We know that the input gptab entries are | |
4400 | sorted by ascending -G value. */ | |
4401 | size = bfd_section_size (input_bfd, input_section); | |
4402 | last = 0; | |
4403 | for (gpentry = sizeof (Elf64_External_gptab); | |
4404 | gpentry < size; | |
4405 | gpentry += sizeof (Elf64_External_gptab)) | |
4406 | { | |
4407 | Elf64_External_gptab ext_gptab; | |
4408 | Elf64_gptab int_gptab; | |
4409 | unsigned long val; | |
4410 | unsigned long add; | |
4411 | boolean exact; | |
4412 | unsigned int look; | |
4413 | ||
4414 | if (! (bfd_get_section_contents | |
4415 | (input_bfd, input_section, (PTR) &ext_gptab, | |
4416 | gpentry, sizeof (Elf64_External_gptab)))) | |
4417 | { | |
4418 | free (tab); | |
4419 | return false; | |
4420 | } | |
4421 | ||
4422 | bfd_alpha_elf64_swap_gptab_in (input_bfd, &ext_gptab, | |
4423 | &int_gptab); | |
4424 | val = int_gptab.gt_entry.gt_g_value; | |
4425 | add = int_gptab.gt_entry.gt_bytes - last; | |
4426 | ||
4427 | exact = false; | |
4428 | for (look = 1; look < c; look++) | |
4429 | { | |
4430 | if (tab[look].gt_entry.gt_g_value >= val) | |
4431 | tab[look].gt_entry.gt_bytes += add; | |
4432 | ||
4433 | if (tab[look].gt_entry.gt_g_value == val) | |
4434 | exact = true; | |
4435 | } | |
4436 | ||
4437 | if (! exact) | |
4438 | { | |
4439 | Elf64_gptab *new_tab; | |
4440 | unsigned int max; | |
4441 | ||
4442 | /* We need a new table entry. */ | |
4443 | new_tab = ((Elf64_gptab *) | |
4444 | bfd_realloc ((PTR) tab, | |
4445 | (c + 1) * sizeof (Elf64_gptab))); | |
4446 | if (new_tab == NULL) | |
4447 | { | |
4448 | free (tab); | |
4449 | return false; | |
4450 | } | |
4451 | tab = new_tab; | |
4452 | tab[c].gt_entry.gt_g_value = val; | |
4453 | tab[c].gt_entry.gt_bytes = add; | |
4454 | ||
4455 | /* Merge in the size for the next smallest -G | |
4456 | value, since that will be implied by this new | |
4457 | value. */ | |
4458 | max = 0; | |
4459 | for (look = 1; look < c; look++) | |
4460 | { | |
4461 | if (tab[look].gt_entry.gt_g_value < val | |
4462 | && (max == 0 | |
4463 | || (tab[look].gt_entry.gt_g_value | |
4464 | > tab[max].gt_entry.gt_g_value))) | |
4465 | max = look; | |
4466 | } | |
4467 | if (max != 0) | |
4468 | tab[c].gt_entry.gt_bytes += | |
4469 | tab[max].gt_entry.gt_bytes; | |
4470 | ||
4471 | ++c; | |
4472 | } | |
4473 | ||
4474 | last = int_gptab.gt_entry.gt_bytes; | |
4475 | } | |
4476 | ||
4477 | /* Hack: reset the SEC_HAS_CONTENTS flag so that | |
4478 | elf_link_input_bfd ignores this section. */ | |
4479 | input_section->flags &=~ SEC_HAS_CONTENTS; | |
4480 | } | |
4481 | ||
4482 | /* The table must be sorted by -G value. */ | |
4483 | if (c > 2) | |
4484 | qsort (tab + 1, c - 1, sizeof (tab[0]), gptab_compare); | |
4485 | ||
4486 | /* Swap out the table. */ | |
4487 | ext_tab = ((Elf64_External_gptab *) | |
4488 | bfd_alloc (abfd, c * sizeof (Elf64_External_gptab))); | |
4489 | if (ext_tab == NULL) | |
4490 | { | |
4491 | free (tab); | |
4492 | return false; | |
4493 | } | |
4494 | ||
4495 | for (i = 0; i < c; i++) | |
4496 | bfd_alpha_elf64_swap_gptab_out (abfd, tab + i, ext_tab + i); | |
4497 | free (tab); | |
4498 | ||
4499 | o->_raw_size = c * sizeof (Elf64_External_gptab); | |
4500 | o->contents = (bfd_byte *) ext_tab; | |
4501 | ||
4502 | /* Skip this section later on (I don't think this currently | |
4503 | matters, but someday it might). */ | |
4504 | o->link_order_head = (struct bfd_link_order *) NULL; | |
4505 | } | |
4506 | #endif | |
4507 | ||
4508 | } | |
4509 | ||
4510 | /* Invoke the regular ELF backend linker to do all the work. */ | |
4511 | if (! bfd_elf64_bfd_final_link (abfd, info)) | |
4512 | return false; | |
4513 | ||
4514 | /* Now write out the computed sections. */ | |
4515 | ||
4516 | /* The .got subsections... */ | |
4517 | { | |
4518 | bfd *i, *dynobj = elf_hash_table(info)->dynobj; | |
4519 | for (i = alpha_elf_hash_table(info)->got_list; | |
4520 | i != NULL; | |
4521 | i = alpha_elf_tdata(i)->got_link_next) | |
4522 | { | |
4523 | asection *sgot; | |
4524 | ||
4525 | /* elf_bfd_final_link already did everything in dynobj. */ | |
4526 | if (i == dynobj) | |
4527 | continue; | |
4528 | ||
4529 | sgot = alpha_elf_tdata(i)->got; | |
4530 | if (! bfd_set_section_contents (abfd, sgot->output_section, | |
4531 | sgot->contents, sgot->output_offset, | |
4532 | sgot->_raw_size)) | |
4533 | return false; | |
4534 | } | |
4535 | } | |
4536 | ||
4537 | #ifdef ERIC_neverdef | |
4538 | if (reginfo_sec != (asection *) NULL) | |
4539 | { | |
4540 | Elf64_External_RegInfo ext; | |
4541 | ||
4542 | bfd_alpha_elf64_swap_reginfo_out (abfd, ®info, &ext); | |
4543 | if (! bfd_set_section_contents (abfd, reginfo_sec, (PTR) &ext, | |
4544 | (file_ptr) 0, sizeof ext)) | |
4545 | return false; | |
4546 | } | |
4547 | #endif | |
4548 | ||
4549 | if (mdebug_sec != (asection *) NULL) | |
4550 | { | |
4551 | BFD_ASSERT (abfd->output_has_begun); | |
4552 | if (! bfd_ecoff_write_accumulated_debug (mdebug_handle, abfd, &debug, | |
4553 | swap, info, | |
4554 | mdebug_sec->filepos)) | |
4555 | return false; | |
4556 | ||
4557 | bfd_ecoff_debug_free (mdebug_handle, abfd, &debug, swap, info); | |
4558 | } | |
4559 | ||
4560 | if (gptab_data_sec != (asection *) NULL) | |
4561 | { | |
4562 | if (! bfd_set_section_contents (abfd, gptab_data_sec, | |
4563 | gptab_data_sec->contents, | |
4564 | (file_ptr) 0, | |
4565 | gptab_data_sec->_raw_size)) | |
4566 | return false; | |
4567 | } | |
4568 | ||
4569 | if (gptab_bss_sec != (asection *) NULL) | |
4570 | { | |
4571 | if (! bfd_set_section_contents (abfd, gptab_bss_sec, | |
4572 | gptab_bss_sec->contents, | |
4573 | (file_ptr) 0, | |
4574 | gptab_bss_sec->_raw_size)) | |
4575 | return false; | |
4576 | } | |
4577 | ||
4578 | return true; | |
4579 | } | |
4580 | \f | |
4581 | /* ECOFF swapping routines. These are used when dealing with the | |
4582 | .mdebug section, which is in the ECOFF debugging format. Copied | |
4583 | from elf32-mips.c. */ | |
4584 | static const struct ecoff_debug_swap | |
4585 | elf64_alpha_ecoff_debug_swap = | |
4586 | { | |
4587 | /* Symbol table magic number. */ | |
4588 | magicSym2, | |
4589 | /* Alignment of debugging information. E.g., 4. */ | |
4590 | 8, | |
4591 | /* Sizes of external symbolic information. */ | |
4592 | sizeof (struct hdr_ext), | |
4593 | sizeof (struct dnr_ext), | |
4594 | sizeof (struct pdr_ext), | |
4595 | sizeof (struct sym_ext), | |
4596 | sizeof (struct opt_ext), | |
4597 | sizeof (struct fdr_ext), | |
4598 | sizeof (struct rfd_ext), | |
4599 | sizeof (struct ext_ext), | |
4600 | /* Functions to swap in external symbolic data. */ | |
4601 | ecoff_swap_hdr_in, | |
4602 | ecoff_swap_dnr_in, | |
4603 | ecoff_swap_pdr_in, | |
4604 | ecoff_swap_sym_in, | |
4605 | ecoff_swap_opt_in, | |
4606 | ecoff_swap_fdr_in, | |
4607 | ecoff_swap_rfd_in, | |
4608 | ecoff_swap_ext_in, | |
4609 | _bfd_ecoff_swap_tir_in, | |
4610 | _bfd_ecoff_swap_rndx_in, | |
4611 | /* Functions to swap out external symbolic data. */ | |
4612 | ecoff_swap_hdr_out, | |
4613 | ecoff_swap_dnr_out, | |
4614 | ecoff_swap_pdr_out, | |
4615 | ecoff_swap_sym_out, | |
4616 | ecoff_swap_opt_out, | |
4617 | ecoff_swap_fdr_out, | |
4618 | ecoff_swap_rfd_out, | |
4619 | ecoff_swap_ext_out, | |
4620 | _bfd_ecoff_swap_tir_out, | |
4621 | _bfd_ecoff_swap_rndx_out, | |
4622 | /* Function to read in symbolic data. */ | |
4623 | elf64_alpha_read_ecoff_info | |
4624 | }; | |
4625 | \f | |
4626 | #define TARGET_LITTLE_SYM bfd_elf64_alpha_vec | |
4627 | #define TARGET_LITTLE_NAME "elf64-alpha" | |
4628 | #define ELF_ARCH bfd_arch_alpha | |
4629 | #define ELF_MACHINE_CODE EM_ALPHA | |
4630 | #define ELF_MAXPAGESIZE 0x10000 | |
4631 | ||
4632 | #define bfd_elf64_bfd_link_hash_table_create \ | |
4633 | elf64_alpha_bfd_link_hash_table_create | |
4634 | ||
4635 | #define bfd_elf64_bfd_reloc_type_lookup \ | |
4636 | elf64_alpha_bfd_reloc_type_lookup | |
4637 | #define elf_info_to_howto \ | |
4638 | elf64_alpha_info_to_howto | |
4639 | ||
4640 | #define bfd_elf64_mkobject \ | |
4641 | elf64_alpha_mkobject | |
4642 | #define elf_backend_object_p \ | |
4643 | elf64_alpha_object_p | |
4644 | ||
4645 | #define elf_backend_section_from_shdr \ | |
4646 | elf64_alpha_section_from_shdr | |
4647 | #define elf_backend_fake_sections \ | |
4648 | elf64_alpha_fake_sections | |
4649 | ||
4650 | #define bfd_elf64_bfd_is_local_label_name \ | |
4651 | elf64_alpha_is_local_label_name | |
4652 | #define bfd_elf64_find_nearest_line \ | |
4653 | elf64_alpha_find_nearest_line | |
4654 | #define bfd_elf64_bfd_relax_section \ | |
4655 | elf64_alpha_relax_section | |
4656 | ||
4657 | #define elf_backend_add_symbol_hook \ | |
4658 | elf64_alpha_add_symbol_hook | |
4659 | #define elf_backend_check_relocs \ | |
4660 | elf64_alpha_check_relocs | |
4661 | #define elf_backend_create_dynamic_sections \ | |
4662 | elf64_alpha_create_dynamic_sections | |
4663 | #define elf_backend_adjust_dynamic_symbol \ | |
4664 | elf64_alpha_adjust_dynamic_symbol | |
4665 | #define elf_backend_always_size_sections \ | |
4666 | elf64_alpha_always_size_sections | |
4667 | #define elf_backend_size_dynamic_sections \ | |
4668 | elf64_alpha_size_dynamic_sections | |
4669 | #define elf_backend_relocate_section \ | |
4670 | elf64_alpha_relocate_section | |
4671 | #define elf_backend_finish_dynamic_symbol \ | |
4672 | elf64_alpha_finish_dynamic_symbol | |
4673 | #define elf_backend_finish_dynamic_sections \ | |
4674 | elf64_alpha_finish_dynamic_sections | |
4675 | #define bfd_elf64_bfd_final_link \ | |
4676 | elf64_alpha_final_link | |
4677 | ||
4678 | #define elf_backend_ecoff_debug_swap \ | |
4679 | &elf64_alpha_ecoff_debug_swap | |
4680 | ||
4681 | /* | |
4682 | * A few constants that determine how the .plt section is set up. | |
4683 | */ | |
4684 | #define elf_backend_want_got_plt 0 | |
4685 | #define elf_backend_plt_readonly 0 | |
4686 | #define elf_backend_want_plt_sym 1 | |
4687 | #define elf_backend_got_header_size 0 | |
4688 | #define elf_backend_plt_header_size PLT_HEADER_SIZE | |
4689 | ||
4690 | #include "elf64-target.h" |