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252b5132 RH |
1 | /* BFD back-end for HP PA-RISC ELF files. |
2 | Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 1997 | |
3 | Free Software Foundation, Inc. | |
4 | ||
5 | Written by | |
6 | ||
7 | Center for Software Science | |
8 | Department of Computer Science | |
9 | University of Utah | |
10 | ||
11 | This file is part of BFD, the Binary File Descriptor library. | |
12 | ||
13 | This program is free software; you can redistribute it and/or modify | |
14 | it under the terms of the GNU General Public License as published by | |
15 | the Free Software Foundation; either version 2 of the License, or | |
16 | (at your option) any later version. | |
17 | ||
18 | This program is distributed in the hope that it will be useful, | |
19 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | GNU General Public License for more details. | |
22 | ||
23 | You should have received a copy of the GNU General Public License | |
24 | along with this program; if not, write to the Free Software | |
25 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
26 | ||
27 | #include "bfd.h" | |
28 | #include "sysdep.h" | |
252b5132 RH |
29 | #include "libbfd.h" |
30 | #include "elf-bfd.h" | |
9e103c9c JL |
31 | #include "elf/hppa.h" |
32 | #include "libhppa.h" | |
33 | #include "elf32-hppa.h" | |
34 | #define ARCH_SIZE 32 | |
35 | #include "elf-hppa.h" | |
36 | ||
252b5132 RH |
37 | |
38 | /* The internal type of a symbol table extension entry. */ | |
39 | typedef unsigned long symext_entryS; | |
40 | ||
41 | /* The external type of a symbol table extension entry. */ | |
42 | #define ELF32_PARISC_SX_SIZE (4) | |
43 | #define ELF32_PARISC_SX_GET(bfd, addr) bfd_h_get_32 ((bfd), (addr)) | |
44 | #define ELF32_PARISC_SX_PUT(bfd, val, addr) \ | |
45 | bfd_h_put_32 ((bfd), (val), (addr)) | |
46 | ||
47 | /* HPPA symbol table extension entry types */ | |
48 | enum elf32_hppa_symextn_types | |
49 | { | |
50 | PARISC_SXT_NULL, | |
51 | PARISC_SXT_SYMNDX, | |
52 | PARISC_SXT_ARG_RELOC, | |
53 | }; | |
54 | ||
55 | /* These macros compose and decompose the value of a symextn entry: | |
56 | ||
57 | entry_type = ELF32_PARISC_SX_TYPE(word); | |
58 | entry_value = ELF32_PARISC_SX_VAL(word); | |
59 | word = ELF32_PARISC_SX_WORD(type,val); */ | |
60 | ||
61 | #define ELF32_PARISC_SX_TYPE(p) ((p) >> 24) | |
62 | #define ELF32_PARISC_SX_VAL(p) ((p) & 0xFFFFFF) | |
63 | #define ELF32_PARISC_SX_WORD(type,val) (((type) << 24) + (val & 0xFFFFFF)) | |
64 | ||
65 | /* The following was added facilitate implementation of the .hppa_symextn | |
66 | section. This section is built after the symbol table is built in the | |
67 | elf_write_object_contents routine (called from bfd_close). It is built | |
68 | so late because it requires information that is not known until | |
69 | the symbol and string table sections have been allocated, and | |
70 | the symbol table has been built. */ | |
71 | ||
72 | #define SYMEXTN_SECTION_NAME ".PARISC.symext" | |
73 | ||
74 | struct symext_chain | |
75 | { | |
76 | symext_entryS entry; | |
77 | struct symext_chain *next; | |
78 | }; | |
79 | ||
80 | typedef struct symext_chain symext_chainS; | |
81 | ||
82 | /* We use three different hash tables to hold information for | |
83 | linking PA ELF objects. | |
84 | ||
85 | The first is the elf32_hppa_link_hash_table which is derived | |
86 | from the standard ELF linker hash table. We use this as a place to | |
87 | attach other hash tables and static information. | |
88 | ||
89 | The second is the stub hash table which is derived from the | |
90 | base BFD hash table. The stub hash table holds the information | |
91 | necessary to build the linker stubs during a link. | |
92 | ||
93 | The last hash table keeps track of argument location information needed | |
94 | to build hash tables. Each function with nonzero argument location | |
95 | bits will have an entry in this table. */ | |
96 | ||
97 | /* Hash table for linker stubs. */ | |
98 | ||
99 | struct elf32_hppa_stub_hash_entry | |
100 | { | |
101 | /* Base hash table entry structure, we can get the name of the stub | |
102 | (and thus know exactly what actions it performs) from the base | |
103 | hash table entry. */ | |
104 | struct bfd_hash_entry root; | |
105 | ||
106 | /* Offset of the beginning of this stub. */ | |
107 | bfd_vma offset; | |
108 | ||
109 | /* Given the symbol's value and its section we can determine its final | |
110 | value when building the stubs (so the stub knows where to jump. */ | |
111 | symvalue target_value; | |
112 | asection *target_section; | |
113 | }; | |
114 | ||
115 | struct elf32_hppa_stub_hash_table | |
116 | { | |
117 | /* The hash table itself. */ | |
118 | struct bfd_hash_table root; | |
119 | ||
120 | /* The stub BFD. */ | |
121 | bfd *stub_bfd; | |
122 | ||
123 | /* Where to place the next stub. */ | |
124 | bfd_byte *location; | |
125 | ||
126 | /* Current offset in the stub section. */ | |
127 | unsigned int offset; | |
128 | ||
129 | }; | |
130 | ||
131 | /* Hash table for argument location information. */ | |
132 | ||
133 | struct elf32_hppa_args_hash_entry | |
134 | { | |
135 | /* Base hash table entry structure. */ | |
136 | struct bfd_hash_entry root; | |
137 | ||
138 | /* The argument location bits for this entry. */ | |
139 | int arg_bits; | |
140 | }; | |
141 | ||
142 | struct elf32_hppa_args_hash_table | |
143 | { | |
144 | /* The hash table itself. */ | |
145 | struct bfd_hash_table root; | |
146 | }; | |
147 | ||
148 | struct elf32_hppa_link_hash_entry | |
149 | { | |
150 | struct elf_link_hash_entry root; | |
151 | }; | |
152 | ||
153 | struct elf32_hppa_link_hash_table | |
154 | { | |
155 | /* The main hash table. */ | |
156 | struct elf_link_hash_table root; | |
157 | ||
158 | /* The stub hash table. */ | |
159 | struct elf32_hppa_stub_hash_table *stub_hash_table; | |
160 | ||
161 | /* The argument relocation bits hash table. */ | |
162 | struct elf32_hppa_args_hash_table *args_hash_table; | |
163 | ||
164 | /* A count of the number of output symbols. */ | |
165 | unsigned int output_symbol_count; | |
166 | ||
167 | /* Stuff so we can handle DP relative relocations. */ | |
168 | long global_value; | |
169 | int global_sym_defined; | |
170 | }; | |
171 | ||
172 | /* FIXME. */ | |
173 | #define ARGUMENTS 0 | |
174 | #define RETURN_VALUE 1 | |
175 | ||
176 | /* The various argument relocations that may be performed. */ | |
177 | typedef enum | |
178 | { | |
179 | /* No relocation. */ | |
180 | NO, | |
181 | /* Relocate 32 bits from GR to FP register. */ | |
182 | GF, | |
183 | /* Relocate 64 bits from a GR pair to FP pair. */ | |
184 | GD, | |
185 | /* Relocate 32 bits from FP to GR. */ | |
186 | FG, | |
187 | /* Relocate 64 bits from FP pair to GR pair. */ | |
188 | DG, | |
189 | } arg_reloc_type; | |
190 | ||
191 | /* What is being relocated (eg which argument or the return value). */ | |
192 | typedef enum | |
193 | { | |
194 | ARG0, ARG1, ARG2, ARG3, RET, | |
195 | } arg_reloc_location; | |
196 | ||
197 | ||
198 | /* ELF32/HPPA relocation support | |
199 | ||
200 | This file contains ELF32/HPPA relocation support as specified | |
201 | in the Stratus FTX/Golf Object File Format (SED-1762) dated | |
202 | February 1994. */ | |
203 | ||
204 | #include "elf32-hppa.h" | |
205 | #include "hppa_stubs.h" | |
206 | ||
207 | static bfd_reloc_status_type hppa_elf_reloc | |
208 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); | |
209 | ||
210 | static unsigned long hppa_elf_relocate_insn | |
211 | PARAMS ((bfd *, asection *, unsigned long, unsigned long, long, | |
212 | long, unsigned long, unsigned long, unsigned long)); | |
213 | ||
214 | static bfd_reloc_status_type hppa_elf_reloc | |
215 | PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd*, char **)); | |
216 | ||
252b5132 RH |
217 | static boolean elf32_hppa_set_section_contents |
218 | PARAMS ((bfd *, sec_ptr, PTR, file_ptr, bfd_size_type)); | |
219 | ||
252b5132 RH |
220 | static boolean elf32_hppa_backend_symbol_table_processing |
221 | PARAMS ((bfd *, elf_symbol_type *, unsigned int)); | |
222 | ||
223 | static void elf32_hppa_backend_begin_write_processing | |
224 | PARAMS ((bfd *, struct bfd_link_info *)); | |
225 | ||
226 | static void elf32_hppa_backend_final_write_processing | |
227 | PARAMS ((bfd *, boolean)); | |
228 | ||
229 | static void add_entry_to_symext_chain | |
230 | PARAMS ((bfd *, unsigned int, unsigned int, symext_chainS **, | |
231 | symext_chainS **)); | |
232 | ||
233 | static void | |
234 | elf_hppa_tc_make_sections PARAMS ((bfd *, symext_chainS *)); | |
235 | ||
236 | static boolean hppa_elf_is_local_label_name PARAMS ((bfd *, const char *)); | |
237 | ||
238 | static boolean elf32_hppa_add_symbol_hook | |
239 | PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *, | |
240 | const char **, flagword *, asection **, bfd_vma *)); | |
241 | ||
242 | static bfd_reloc_status_type elf32_hppa_bfd_final_link_relocate | |
243 | PARAMS ((reloc_howto_type *, bfd *, bfd *, asection *, | |
244 | bfd_byte *, bfd_vma, bfd_vma, bfd_vma, struct bfd_link_info *, | |
245 | asection *, const char *, int)); | |
246 | ||
247 | static struct bfd_link_hash_table *elf32_hppa_link_hash_table_create | |
248 | PARAMS ((bfd *)); | |
249 | ||
250 | static struct bfd_hash_entry * | |
251 | elf32_hppa_stub_hash_newfunc | |
252 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
253 | ||
254 | static struct bfd_hash_entry * | |
255 | elf32_hppa_args_hash_newfunc | |
256 | PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); | |
257 | ||
258 | static boolean | |
259 | elf32_hppa_relocate_section | |
260 | PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, | |
261 | bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); | |
262 | ||
263 | static boolean | |
264 | elf32_hppa_stub_hash_table_init | |
265 | PARAMS ((struct elf32_hppa_stub_hash_table *, bfd *, | |
266 | struct bfd_hash_entry *(*) PARAMS ((struct bfd_hash_entry *, | |
267 | struct bfd_hash_table *, | |
268 | const char *)))); | |
269 | ||
270 | static boolean | |
271 | elf32_hppa_build_one_stub PARAMS ((struct bfd_hash_entry *, PTR)); | |
272 | ||
273 | static boolean | |
274 | elf32_hppa_read_symext_info | |
275 | PARAMS ((bfd *, Elf_Internal_Shdr *, struct elf32_hppa_args_hash_table *, | |
276 | Elf_Internal_Sym *)); | |
277 | ||
278 | static unsigned int elf32_hppa_size_of_stub | |
279 | PARAMS ((unsigned int, unsigned int, bfd_vma, bfd_vma, const char *)); | |
280 | ||
281 | static boolean elf32_hppa_arg_reloc_needed | |
282 | PARAMS ((unsigned int, unsigned int, arg_reloc_type [])); | |
283 | ||
284 | static void elf32_hppa_name_of_stub | |
285 | PARAMS ((unsigned int, unsigned int, bfd_vma, bfd_vma, char *)); | |
286 | ||
287 | static boolean elf32_hppa_size_symext PARAMS ((struct bfd_hash_entry *, PTR)); | |
288 | ||
289 | static boolean elf32_hppa_link_output_symbol_hook | |
290 | PARAMS ((bfd *, struct bfd_link_info *, const char *, | |
291 | Elf_Internal_Sym *, asection *)); | |
292 | ||
252b5132 RH |
293 | /* Where (what register type) is an argument comming from? */ |
294 | typedef enum | |
295 | { | |
296 | AR_NO, | |
297 | AR_GR, | |
298 | AR_FR, | |
299 | AR_FU, | |
300 | AR_FPDBL1, | |
301 | AR_FPDBL2, | |
302 | } arg_location; | |
303 | ||
304 | /* Horizontal represents the callee's argument location information, | |
305 | vertical represents caller's argument location information. Value at a | |
306 | particular X,Y location represents what (if any) argument relocation | |
307 | needs to be performed to make caller and callee agree. */ | |
308 | ||
309 | static CONST arg_reloc_type arg_mismatches[6][6] = | |
310 | { | |
311 | {NO, NO, NO, NO, NO, NO}, | |
312 | {NO, NO, GF, NO, GD, NO}, | |
313 | {NO, FG, NO, NO, NO, NO}, | |
314 | {NO, NO, NO, NO, NO, NO}, | |
315 | {NO, DG, NO, NO, NO, NO}, | |
316 | {NO, DG, NO, NO, NO, NO}, | |
317 | }; | |
318 | ||
319 | /* Likewise, but reversed for the return value. */ | |
320 | static CONST arg_reloc_type ret_mismatches[6][6] = | |
321 | { | |
322 | {NO, NO, NO, NO, NO, NO}, | |
323 | {NO, NO, FG, NO, DG, NO}, | |
324 | {NO, GF, NO, NO, NO, NO}, | |
325 | {NO, NO, NO, NO, NO, NO}, | |
326 | {NO, GD, NO, NO, NO, NO}, | |
327 | {NO, GD, NO, NO, NO, NO}, | |
328 | }; | |
329 | ||
330 | /* Misc static crud for symbol extension records. */ | |
331 | static symext_chainS *symext_rootP; | |
332 | static symext_chainS *symext_lastP; | |
333 | static bfd_size_type symext_chain_size; | |
334 | ||
335 | /* FIXME: We should be able to try this static variable! */ | |
336 | static bfd_byte *symextn_contents; | |
337 | ||
338 | ||
339 | /* For linker stub hash tables. */ | |
340 | #define elf32_hppa_stub_hash_lookup(table, string, create, copy) \ | |
341 | ((struct elf32_hppa_stub_hash_entry *) \ | |
342 | bfd_hash_lookup (&(table)->root, (string), (create), (copy))) | |
343 | ||
344 | #define elf32_hppa_stub_hash_traverse(table, func, info) \ | |
345 | (bfd_hash_traverse \ | |
346 | (&(table)->root, \ | |
347 | (boolean (*) PARAMS ((struct bfd_hash_entry *, PTR))) (func), \ | |
348 | (info))) | |
349 | ||
350 | /* For linker args hash tables. */ | |
351 | #define elf32_hppa_args_hash_lookup(table, string, create, copy) \ | |
352 | ((struct elf32_hppa_args_hash_entry *) \ | |
353 | bfd_hash_lookup (&(table)->root, (string), (create), (copy))) | |
354 | ||
355 | #define elf32_hppa_args_hash_traverse(table, func, info) \ | |
356 | (bfd_hash_traverse \ | |
357 | (&(table)->root, \ | |
358 | (boolean (*) PARAMS ((struct bfd_hash_entry *, PTR))) (func), \ | |
359 | (info))) | |
360 | ||
361 | #define elf32_hppa_args_hash_table_init(table, newfunc) \ | |
362 | (bfd_hash_table_init \ | |
363 | (&(table)->root, \ | |
364 | (struct bfd_hash_entry *(*) PARAMS ((struct bfd_hash_entry *, \ | |
365 | struct bfd_hash_table *, \ | |
366 | const char *))) (newfunc))) | |
367 | ||
368 | /* For HPPA linker hash table. */ | |
369 | ||
370 | #define elf32_hppa_link_hash_lookup(table, string, create, copy, follow)\ | |
371 | ((struct elf32_hppa_link_hash_entry *) \ | |
372 | elf_link_hash_lookup (&(table)->root, (string), (create), \ | |
373 | (copy), (follow))) | |
374 | ||
375 | #define elf32_hppa_link_hash_traverse(table, func, info) \ | |
376 | (elf_link_hash_traverse \ | |
377 | (&(table)->root, \ | |
378 | (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ | |
379 | (info))) | |
380 | ||
381 | /* Get the PA ELF linker hash table from a link_info structure. */ | |
382 | ||
383 | #define elf32_hppa_hash_table(p) \ | |
384 | ((struct elf32_hppa_link_hash_table *) ((p)->hash)) | |
385 | ||
386 | ||
387 | /* Extract specific argument location bits for WHICH from | |
388 | the full argument location in AR. */ | |
389 | #define EXTRACT_ARBITS(ar, which) ((ar) >> (8 - ((which) * 2))) & 3 | |
390 | ||
391 | /* Assorted hash table functions. */ | |
392 | ||
393 | /* Initialize an entry in the stub hash table. */ | |
394 | ||
395 | static struct bfd_hash_entry * | |
396 | elf32_hppa_stub_hash_newfunc (entry, table, string) | |
397 | struct bfd_hash_entry *entry; | |
398 | struct bfd_hash_table *table; | |
399 | const char *string; | |
400 | { | |
401 | struct elf32_hppa_stub_hash_entry *ret; | |
402 | ||
403 | ret = (struct elf32_hppa_stub_hash_entry *) entry; | |
404 | ||
405 | /* Allocate the structure if it has not already been allocated by a | |
406 | subclass. */ | |
407 | if (ret == NULL) | |
408 | ret = ((struct elf32_hppa_stub_hash_entry *) | |
409 | bfd_hash_allocate (table, | |
410 | sizeof (struct elf32_hppa_stub_hash_entry))); | |
411 | if (ret == NULL) | |
412 | return NULL; | |
413 | ||
414 | /* Call the allocation method of the superclass. */ | |
415 | ret = ((struct elf32_hppa_stub_hash_entry *) | |
416 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); | |
417 | ||
418 | if (ret) | |
419 | { | |
420 | /* Initialize the local fields. */ | |
421 | ret->offset = 0; | |
422 | ret->target_value = 0; | |
423 | ret->target_section = NULL; | |
424 | } | |
425 | ||
426 | return (struct bfd_hash_entry *) ret; | |
427 | } | |
428 | ||
429 | /* Initialize a stub hash table. */ | |
430 | ||
431 | static boolean | |
432 | elf32_hppa_stub_hash_table_init (table, stub_bfd, newfunc) | |
433 | struct elf32_hppa_stub_hash_table *table; | |
434 | bfd *stub_bfd; | |
435 | struct bfd_hash_entry *(*newfunc) PARAMS ((struct bfd_hash_entry *, | |
436 | struct bfd_hash_table *, | |
437 | const char *)); | |
438 | { | |
439 | table->offset = 0; | |
440 | table->location = 0; | |
441 | table->stub_bfd = stub_bfd; | |
442 | return (bfd_hash_table_init (&table->root, newfunc)); | |
443 | } | |
444 | ||
445 | /* Initialize an entry in the argument location hash table. */ | |
446 | ||
447 | static struct bfd_hash_entry * | |
448 | elf32_hppa_args_hash_newfunc (entry, table, string) | |
449 | struct bfd_hash_entry *entry; | |
450 | struct bfd_hash_table *table; | |
451 | const char *string; | |
452 | { | |
453 | struct elf32_hppa_args_hash_entry *ret; | |
454 | ||
455 | ret = (struct elf32_hppa_args_hash_entry *) entry; | |
456 | ||
457 | /* Allocate the structure if it has not already been allocated by a | |
458 | subclass. */ | |
459 | if (ret == NULL) | |
460 | ret = ((struct elf32_hppa_args_hash_entry *) | |
461 | bfd_hash_allocate (table, | |
462 | sizeof (struct elf32_hppa_args_hash_entry))); | |
463 | if (ret == NULL) | |
464 | return NULL; | |
465 | ||
466 | /* Call the allocation method of the superclass. */ | |
467 | ret = ((struct elf32_hppa_args_hash_entry *) | |
468 | bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string)); | |
469 | ||
470 | /* Initialize the local fields. */ | |
471 | if (ret) | |
472 | ret->arg_bits = 0; | |
473 | ||
474 | return (struct bfd_hash_entry *) ret; | |
475 | } | |
476 | ||
477 | /* Create the derived linker hash table. The PA ELF port uses the derived | |
478 | hash table to keep information specific to the PA ELF linker (without | |
479 | using static variables). */ | |
480 | ||
481 | static struct bfd_link_hash_table * | |
482 | elf32_hppa_link_hash_table_create (abfd) | |
483 | bfd *abfd; | |
484 | { | |
485 | struct elf32_hppa_link_hash_table *ret; | |
486 | ||
487 | ret = ((struct elf32_hppa_link_hash_table *) | |
488 | bfd_alloc (abfd, sizeof (struct elf32_hppa_link_hash_table))); | |
489 | if (ret == NULL) | |
490 | return NULL; | |
491 | if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, | |
492 | _bfd_elf_link_hash_newfunc)) | |
493 | { | |
494 | bfd_release (abfd, ret); | |
495 | return NULL; | |
496 | } | |
497 | ret->stub_hash_table = NULL; | |
498 | ret->args_hash_table = NULL; | |
499 | ret->output_symbol_count = 0; | |
500 | ret->global_value = 0; | |
501 | ret->global_sym_defined = 0; | |
502 | ||
503 | return &ret->root.root; | |
504 | } | |
505 | ||
506 | /* Relocate the given INSN given the various input parameters. | |
507 | ||
508 | FIXME: endianness and sizeof (long) issues abound here. */ | |
509 | ||
510 | static unsigned long | |
511 | hppa_elf_relocate_insn (abfd, input_sect, insn, address, sym_value, | |
512 | r_addend, r_format, r_field, pcrel) | |
513 | bfd *abfd; | |
514 | asection *input_sect; | |
515 | unsigned long insn; | |
516 | unsigned long address; | |
517 | long sym_value; | |
518 | long r_addend; | |
519 | unsigned long r_format; | |
520 | unsigned long r_field; | |
521 | unsigned long pcrel; | |
522 | { | |
523 | unsigned char opcode = get_opcode (insn); | |
524 | long constant_value; | |
525 | ||
526 | switch (opcode) | |
527 | { | |
528 | case LDO: | |
529 | case LDB: | |
530 | case LDH: | |
531 | case LDW: | |
532 | case LDWM: | |
533 | case STB: | |
534 | case STH: | |
535 | case STW: | |
536 | case STWM: | |
537 | case COMICLR: | |
538 | case SUBI: | |
539 | case ADDIT: | |
540 | case ADDI: | |
541 | case LDIL: | |
542 | case ADDIL: | |
543 | constant_value = HPPA_R_CONSTANT (r_addend); | |
544 | ||
545 | if (pcrel) | |
546 | sym_value -= address; | |
547 | ||
548 | sym_value = hppa_field_adjust (sym_value, constant_value, r_field); | |
549 | return hppa_rebuild_insn (abfd, insn, sym_value, r_format); | |
550 | ||
551 | case BL: | |
552 | case BE: | |
553 | case BLE: | |
554 | /* XXX computing constant_value is not needed??? */ | |
555 | constant_value = assemble_17 ((insn & 0x001f0000) >> 16, | |
556 | (insn & 0x00001ffc) >> 2, | |
557 | insn & 1); | |
558 | ||
559 | constant_value = (constant_value << 15) >> 15; | |
560 | if (pcrel) | |
561 | { | |
562 | sym_value -= | |
563 | address + input_sect->output_offset | |
564 | + input_sect->output_section->vma; | |
565 | sym_value = hppa_field_adjust (sym_value, -8, r_field); | |
566 | } | |
567 | else | |
568 | sym_value = hppa_field_adjust (sym_value, constant_value, r_field); | |
569 | ||
570 | return hppa_rebuild_insn (abfd, insn, sym_value >> 2, r_format); | |
571 | ||
572 | default: | |
573 | if (opcode == 0) | |
574 | { | |
575 | constant_value = HPPA_R_CONSTANT (r_addend); | |
576 | ||
577 | if (pcrel) | |
578 | sym_value -= address; | |
579 | ||
580 | return hppa_field_adjust (sym_value, constant_value, r_field); | |
581 | } | |
582 | else | |
583 | abort (); | |
584 | } | |
585 | } | |
586 | ||
587 | /* Relocate an HPPA ELF section. */ | |
588 | ||
589 | static boolean | |
590 | elf32_hppa_relocate_section (output_bfd, info, input_bfd, input_section, | |
591 | contents, relocs, local_syms, local_sections) | |
592 | bfd *output_bfd; | |
593 | struct bfd_link_info *info; | |
594 | bfd *input_bfd; | |
595 | asection *input_section; | |
596 | bfd_byte *contents; | |
597 | Elf_Internal_Rela *relocs; | |
598 | Elf_Internal_Sym *local_syms; | |
599 | asection **local_sections; | |
600 | { | |
601 | Elf_Internal_Shdr *symtab_hdr; | |
602 | Elf_Internal_Rela *rel; | |
603 | Elf_Internal_Rela *relend; | |
604 | ||
605 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
606 | ||
607 | rel = relocs; | |
608 | relend = relocs + input_section->reloc_count; | |
609 | for (; rel < relend; rel++) | |
610 | { | |
611 | int r_type; | |
612 | reloc_howto_type *howto; | |
613 | unsigned long r_symndx; | |
614 | struct elf_link_hash_entry *h; | |
615 | Elf_Internal_Sym *sym; | |
616 | asection *sym_sec; | |
617 | bfd_vma relocation; | |
618 | bfd_reloc_status_type r; | |
619 | const char *sym_name; | |
620 | ||
621 | r_type = ELF32_R_TYPE (rel->r_info); | |
622 | if (r_type < 0 || r_type >= (int) R_PARISC_UNIMPLEMENTED) | |
623 | { | |
624 | bfd_set_error (bfd_error_bad_value); | |
625 | return false; | |
626 | } | |
627 | howto = elf_hppa_howto_table + r_type; | |
628 | ||
629 | r_symndx = ELF32_R_SYM (rel->r_info); | |
630 | ||
631 | if (info->relocateable) | |
632 | { | |
633 | /* This is a relocateable link. We don't have to change | |
634 | anything, unless the reloc is against a section symbol, | |
635 | in which case we have to adjust according to where the | |
636 | section symbol winds up in the output section. */ | |
637 | if (r_symndx < symtab_hdr->sh_info) | |
638 | { | |
639 | sym = local_syms + r_symndx; | |
640 | if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) | |
641 | { | |
642 | sym_sec = local_sections[r_symndx]; | |
643 | rel->r_addend += sym_sec->output_offset; | |
644 | } | |
645 | } | |
646 | ||
647 | continue; | |
648 | } | |
649 | ||
650 | /* This is a final link. */ | |
651 | h = NULL; | |
652 | sym = NULL; | |
653 | sym_sec = NULL; | |
654 | if (r_symndx < symtab_hdr->sh_info) | |
655 | { | |
656 | sym = local_syms + r_symndx; | |
657 | sym_sec = local_sections[r_symndx]; | |
658 | relocation = ((ELF_ST_TYPE (sym->st_info) == STT_SECTION | |
659 | ? 0 : sym->st_value) | |
660 | + sym_sec->output_offset | |
661 | + sym_sec->output_section->vma); | |
662 | } | |
663 | else | |
664 | { | |
665 | long indx; | |
666 | ||
667 | indx = r_symndx - symtab_hdr->sh_info; | |
668 | h = elf_sym_hashes (input_bfd)[indx]; | |
669 | while (h->root.type == bfd_link_hash_indirect | |
670 | || h->root.type == bfd_link_hash_warning) | |
671 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
672 | if (h->root.type == bfd_link_hash_defined | |
673 | || h->root.type == bfd_link_hash_defweak) | |
674 | { | |
675 | sym_sec = h->root.u.def.section; | |
676 | relocation = (h->root.u.def.value | |
677 | + sym_sec->output_offset | |
678 | + sym_sec->output_section->vma); | |
679 | } | |
680 | else if (h->root.type == bfd_link_hash_undefweak) | |
681 | relocation = 0; | |
682 | else | |
683 | { | |
684 | if (!((*info->callbacks->undefined_symbol) | |
685 | (info, h->root.root.string, input_bfd, | |
686 | input_section, rel->r_offset))) | |
687 | return false; | |
688 | break; | |
689 | } | |
690 | } | |
691 | ||
692 | if (h != NULL) | |
693 | sym_name = h->root.root.string; | |
694 | else | |
695 | { | |
696 | sym_name = bfd_elf_string_from_elf_section (input_bfd, | |
697 | symtab_hdr->sh_link, | |
698 | sym->st_name); | |
699 | if (sym_name == NULL) | |
700 | return false; | |
701 | if (*sym_name == '\0') | |
702 | sym_name = bfd_section_name (input_bfd, sym_sec); | |
703 | } | |
704 | ||
705 | /* If args_hash_table is NULL, then we have encountered some | |
706 | kind of link error (ex. undefined symbols). Do not try to | |
707 | apply any relocations, continue the loop so we can notify | |
708 | the user of several errors in a single attempted link. */ | |
709 | if (elf32_hppa_hash_table (info)->args_hash_table == NULL) | |
710 | continue; | |
711 | ||
712 | r = elf32_hppa_bfd_final_link_relocate (howto, input_bfd, output_bfd, | |
713 | input_section, contents, | |
714 | rel->r_offset, relocation, | |
715 | rel->r_addend, info, sym_sec, | |
716 | sym_name, h == NULL); | |
717 | ||
718 | if (r != bfd_reloc_ok) | |
719 | { | |
720 | switch (r) | |
721 | { | |
722 | /* This can happen for DP relative relocs if $global$ is | |
723 | undefined. This is a panic situation so we don't try | |
724 | to continue. */ | |
725 | case bfd_reloc_undefined: | |
726 | case bfd_reloc_notsupported: | |
727 | if (!((*info->callbacks->undefined_symbol) | |
728 | (info, "$global$", input_bfd, | |
729 | input_section, rel->r_offset))) | |
730 | return false; | |
731 | return false; | |
732 | case bfd_reloc_dangerous: | |
733 | { | |
734 | /* We use this return value to indicate that we performed | |
735 | a "dangerous" relocation. This doesn't mean we did | |
736 | the wrong thing, it just means there may be some cleanup | |
737 | that needs to be done here. | |
738 | ||
739 | In particular we had to swap the last call insn and its | |
740 | delay slot. If the delay slot insn needed a relocation, | |
741 | then we'll need to adjust the next relocation entry's | |
742 | offset to account for the fact that the insn moved. | |
743 | ||
744 | This hair wouldn't be necessary if we inserted stubs | |
745 | between procedures and used a "bl" to get to the stub. */ | |
746 | if (rel != relend) | |
747 | { | |
748 | Elf_Internal_Rela *next_rel = rel + 1; | |
749 | ||
750 | if (rel->r_offset + 4 == next_rel->r_offset) | |
751 | next_rel->r_offset -= 4; | |
752 | } | |
753 | break; | |
754 | } | |
755 | default: | |
756 | case bfd_reloc_outofrange: | |
757 | case bfd_reloc_overflow: | |
758 | { | |
759 | if (!((*info->callbacks->reloc_overflow) | |
760 | (info, sym_name, howto->name, (bfd_vma) 0, | |
761 | input_bfd, input_section, rel->r_offset))) | |
762 | return false; | |
763 | } | |
764 | break; | |
765 | } | |
766 | } | |
767 | } | |
768 | ||
769 | return true; | |
770 | } | |
771 | ||
252b5132 RH |
772 | /* Set the contents of a particular section at a particular location. */ |
773 | ||
774 | static boolean | |
775 | elf32_hppa_set_section_contents (abfd, section, location, offset, count) | |
776 | bfd *abfd; | |
777 | sec_ptr section; | |
778 | PTR location; | |
779 | file_ptr offset; | |
780 | bfd_size_type count; | |
781 | { | |
782 | /* Ignore write requests for the symbol extension section until we've | |
783 | had the chance to rebuild it ourselves. */ | |
784 | if (!strcmp (section->name, ".PARISC.symextn") && !symext_chain_size) | |
785 | return true; | |
786 | else | |
787 | return _bfd_elf_set_section_contents (abfd, section, location, | |
788 | offset, count); | |
789 | } | |
790 | ||
252b5132 RH |
791 | /* Actually perform a relocation. NOTE this is (mostly) superceeded |
792 | by elf32_hppa_bfd_final_link_relocate which is called by the new | |
793 | fast linker. */ | |
794 | ||
795 | static bfd_reloc_status_type | |
796 | hppa_elf_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd, | |
797 | error_message) | |
798 | bfd *abfd; | |
799 | arelent *reloc_entry; | |
800 | asymbol *symbol_in; | |
801 | PTR data; | |
802 | asection *input_section; | |
803 | bfd *output_bfd; | |
804 | char **error_message; | |
805 | { | |
806 | /* It is no longer valid to call hppa_elf_reloc when creating | |
807 | a final executable. */ | |
808 | if (output_bfd) | |
809 | { | |
810 | reloc_entry->address += input_section->output_offset; | |
811 | ||
812 | /* Work around lossage in generic elf code to write relocations. | |
813 | (maps different section symbols into the same symbol index). */ | |
814 | if ((symbol_in->flags & BSF_SECTION_SYM) | |
815 | && symbol_in->section) | |
816 | reloc_entry->addend += symbol_in->section->output_offset; | |
817 | return bfd_reloc_ok; | |
818 | } | |
819 | else | |
820 | { | |
821 | *error_message = (char *) _("Unsupported call to hppa_elf_reloc"); | |
822 | return bfd_reloc_notsupported; | |
823 | } | |
824 | } | |
825 | ||
826 | /* Actually perform a relocation as part of a final link. This can get | |
827 | rather hairy when linker stubs are needed. */ | |
828 | ||
829 | static bfd_reloc_status_type | |
830 | elf32_hppa_bfd_final_link_relocate (howto, input_bfd, output_bfd, | |
831 | input_section, contents, offset, value, | |
832 | addend, info, sym_sec, sym_name, is_local) | |
833 | reloc_howto_type *howto; | |
834 | bfd *input_bfd; | |
835 | bfd *output_bfd; | |
836 | asection *input_section; | |
837 | bfd_byte *contents; | |
838 | bfd_vma offset; | |
839 | bfd_vma value; | |
840 | bfd_vma addend; | |
841 | struct bfd_link_info *info; | |
842 | asection *sym_sec; | |
843 | const char *sym_name; | |
844 | int is_local; | |
845 | { | |
846 | unsigned long insn; | |
847 | unsigned long r_type = howto->type; | |
848 | unsigned long r_format = howto->bitsize; | |
849 | unsigned long r_field = e_fsel; | |
850 | bfd_byte *hit_data = contents + offset; | |
851 | boolean r_pcrel = howto->pc_relative; | |
852 | ||
853 | insn = bfd_get_32 (input_bfd, hit_data); | |
854 | ||
855 | /* Make sure we have a value for $global$. FIXME isn't this effectively | |
856 | just like the gp pointer on MIPS? Can we use those routines for this | |
857 | purpose? */ | |
858 | if (!elf32_hppa_hash_table (info)->global_sym_defined) | |
859 | { | |
860 | struct elf_link_hash_entry *h; | |
861 | asection *sec; | |
862 | ||
863 | h = elf_link_hash_lookup (elf_hash_table (info), "$global$", false, | |
864 | false, false); | |
865 | ||
866 | /* If there isn't a $global$, then we're in deep trouble. */ | |
867 | if (h == NULL) | |
868 | return bfd_reloc_notsupported; | |
869 | ||
870 | /* If $global$ isn't a defined symbol, then we're still in deep | |
871 | trouble. */ | |
872 | if (h->root.type != bfd_link_hash_defined) | |
873 | return bfd_reloc_undefined; | |
874 | ||
875 | sec = h->root.u.def.section; | |
876 | elf32_hppa_hash_table (info)->global_value = (h->root.u.def.value | |
877 | + sec->output_section->vma | |
878 | + sec->output_offset); | |
879 | elf32_hppa_hash_table (info)->global_sym_defined = 1; | |
880 | } | |
881 | ||
882 | switch (r_type) | |
883 | { | |
884 | case R_PARISC_NONE: | |
885 | break; | |
886 | ||
887 | case R_PARISC_DIR32: | |
888 | case R_PARISC_DIR17F: | |
889 | case R_PARISC_PCREL17C: | |
890 | r_field = e_fsel; | |
891 | goto do_basic_type_1; | |
892 | case R_PARISC_DIR21L: | |
893 | case R_PARISC_PCREL21L: | |
894 | r_field = e_lrsel; | |
895 | goto do_basic_type_1; | |
896 | case R_PARISC_DIR17R: | |
897 | case R_PARISC_PCREL17R: | |
898 | case R_PARISC_DIR14R: | |
899 | case R_PARISC_PCREL14R: | |
900 | r_field = e_rrsel; | |
901 | goto do_basic_type_1; | |
902 | ||
903 | /* For all the DP relative relocations, we need to examine the symbol's | |
904 | section. If it's a code section, then "data pointer relative" makes | |
905 | no sense. In that case we don't adjust the "value", and for 21 bit | |
906 | addil instructions, we change the source addend register from %dp to | |
907 | %r0. */ | |
908 | case R_PARISC_DPREL21L: | |
909 | r_field = e_lrsel; | |
910 | if (sym_sec->flags & SEC_CODE) | |
911 | { | |
912 | if ((insn & 0xfc000000) >> 26 == 0xa | |
913 | && (insn & 0x03e00000) >> 21 == 0x1b) | |
914 | insn &= ~0x03e00000; | |
915 | } | |
916 | else | |
917 | value -= elf32_hppa_hash_table (info)->global_value; | |
918 | goto do_basic_type_1; | |
919 | case R_PARISC_DPREL14R: | |
920 | r_field = e_rrsel; | |
921 | if ((sym_sec->flags & SEC_CODE) == 0) | |
922 | value -= elf32_hppa_hash_table (info)->global_value; | |
923 | goto do_basic_type_1; | |
924 | case R_PARISC_DPREL14F: | |
925 | r_field = e_fsel; | |
926 | if ((sym_sec->flags & SEC_CODE) == 0) | |
927 | value -= elf32_hppa_hash_table (info)->global_value; | |
928 | goto do_basic_type_1; | |
929 | ||
930 | /* These cases are separate as they may involve a lot more work | |
931 | to deal with linker stubs. */ | |
932 | case R_PARISC_PLABEL32: | |
933 | case R_PARISC_PLABEL21L: | |
934 | case R_PARISC_PLABEL14R: | |
935 | case R_PARISC_PCREL17F: | |
936 | { | |
937 | bfd_vma location; | |
938 | unsigned int len, caller_args, callee_args; | |
939 | arg_reloc_type arg_reloc_types[5]; | |
940 | struct elf32_hppa_args_hash_table *args_hash_table; | |
941 | struct elf32_hppa_args_hash_entry *args_hash; | |
942 | char *new_name, *stub_name; | |
943 | ||
944 | /* Get the field selector right. We'll need it in a minute. */ | |
945 | if (r_type == R_PARISC_PCREL17F | |
946 | || r_type == R_PARISC_PLABEL32) | |
947 | r_field = e_fsel; | |
948 | else if (r_type == R_PARISC_PLABEL21L) | |
949 | r_field = e_lrsel; | |
950 | else if (r_type == R_PARISC_PLABEL14R) | |
951 | r_field = e_rrsel; | |
952 | ||
953 | /* Find out where we are and where we're going. */ | |
954 | location = (offset + | |
955 | input_section->output_offset + | |
956 | input_section->output_section->vma); | |
957 | ||
958 | /* Now look for the argument relocation bits associated with the | |
959 | target. */ | |
960 | len = strlen (sym_name) + 1; | |
961 | if (is_local) | |
962 | len += 9; | |
963 | new_name = bfd_malloc (len); | |
964 | if (!new_name) | |
965 | return bfd_reloc_notsupported; | |
966 | strcpy (new_name, sym_name); | |
967 | ||
968 | /* Local symbols have unique IDs. */ | |
969 | if (is_local) | |
970 | sprintf (new_name + len - 10, "_%08x", (int)sym_sec); | |
971 | ||
972 | args_hash_table = elf32_hppa_hash_table (info)->args_hash_table; | |
973 | ||
974 | args_hash = elf32_hppa_args_hash_lookup (args_hash_table, | |
975 | new_name, false, false); | |
976 | if (args_hash == NULL) | |
977 | callee_args = 0; | |
978 | else | |
979 | callee_args = args_hash->arg_bits; | |
980 | ||
981 | /* If this is a CALL relocation, then get the caller's bits | |
982 | from the addend. Else use the magic 0x155 value for PLABELS. | |
983 | ||
984 | Also we don't care about the destination (value) for PLABELS. */ | |
985 | if (r_type == R_PARISC_PCREL17F) | |
986 | caller_args = HPPA_R_ARG_RELOC (addend); | |
987 | else | |
988 | { | |
989 | caller_args = 0x155; | |
990 | location = value; | |
991 | } | |
992 | ||
993 | /* Any kind of linker stub needed? */ | |
994 | if (((int)(value - location) > 0x3ffff) | |
995 | || ((int)(value - location) < (int)0xfffc0000) | |
996 | || elf32_hppa_arg_reloc_needed (caller_args, callee_args, | |
997 | arg_reloc_types)) | |
998 | { | |
999 | struct elf32_hppa_stub_hash_table *stub_hash_table; | |
1000 | struct elf32_hppa_stub_hash_entry *stub_hash; | |
1001 | asection *stub_section; | |
1002 | ||
1003 | /* Build a name for the stub. */ | |
1004 | ||
1005 | len = strlen (new_name); | |
1006 | len += 23; | |
1007 | stub_name = bfd_malloc (len); | |
1008 | if (!stub_name) | |
1009 | return bfd_reloc_notsupported; | |
1010 | elf32_hppa_name_of_stub (caller_args, callee_args, | |
1011 | location, value, stub_name); | |
1012 | strcat (stub_name, new_name); | |
1013 | free (new_name); | |
1014 | ||
1015 | stub_hash_table = elf32_hppa_hash_table (info)->stub_hash_table; | |
1016 | ||
1017 | stub_hash | |
1018 | = elf32_hppa_stub_hash_lookup (stub_hash_table, stub_name, | |
1019 | false, false); | |
1020 | ||
1021 | /* We're done with that name. */ | |
1022 | free (stub_name); | |
1023 | ||
1024 | /* The stub BFD only has one section. */ | |
1025 | stub_section = stub_hash_table->stub_bfd->sections; | |
1026 | ||
1027 | if (stub_hash != NULL) | |
1028 | { | |
1029 | ||
1030 | if (r_type == R_PARISC_PCREL17F) | |
1031 | { | |
1032 | unsigned long delay_insn; | |
1033 | unsigned int opcode, rtn_reg, ldo_target_reg, ldo_src_reg; | |
1034 | ||
1035 | /* We'll need to peek at the next insn. */ | |
1036 | delay_insn = bfd_get_32 (input_bfd, hit_data + 4); | |
1037 | opcode = get_opcode (delay_insn); | |
1038 | ||
1039 | /* We also need to know the return register for this | |
1040 | call. */ | |
1041 | rtn_reg = (insn & 0x03e00000) >> 21; | |
1042 | ||
1043 | ldo_src_reg = (delay_insn & 0x03e00000) >> 21; | |
1044 | ldo_target_reg = (delay_insn & 0x001f0000) >> 16; | |
1045 | ||
1046 | /* Munge up the value and other parameters for | |
1047 | hppa_elf_relocate_insn. */ | |
1048 | ||
1049 | value = (stub_hash->offset | |
1050 | + stub_section->output_offset | |
1051 | + stub_section->output_section->vma); | |
1052 | ||
1053 | r_format = 17; | |
1054 | r_field = e_fsel; | |
1055 | r_pcrel = 0; | |
1056 | addend = 0; | |
1057 | ||
1058 | /* We need to peek at the delay insn and determine if | |
1059 | we'll need to swap the branch and its delay insn. */ | |
1060 | if ((insn & 2) | |
1061 | || (opcode == LDO | |
1062 | && ldo_target_reg == rtn_reg) | |
1063 | || (delay_insn == 0x08000240)) | |
1064 | { | |
1065 | /* No need to swap the branch and its delay slot, but | |
1066 | we do need to make sure to jump past the return | |
1067 | pointer update in the stub. */ | |
1068 | value += 4; | |
1069 | ||
1070 | /* If the delay insn does a return pointer adjustment, | |
1071 | then we have to make sure it stays valid. */ | |
1072 | if (opcode == LDO | |
1073 | && ldo_target_reg == rtn_reg) | |
1074 | { | |
1075 | delay_insn &= 0xfc00ffff; | |
1076 | delay_insn |= ((31 << 21) | (31 << 16)); | |
1077 | bfd_put_32 (input_bfd, delay_insn, hit_data + 4); | |
1078 | } | |
1079 | /* Use a BLE to reach the stub. */ | |
1080 | insn = BLE_SR4_R0; | |
1081 | } | |
1082 | else | |
1083 | { | |
1084 | /* Wonderful, we have to swap the call insn and its | |
1085 | delay slot. */ | |
1086 | bfd_put_32 (input_bfd, delay_insn, hit_data); | |
1087 | /* Use a BLE,n to reach the stub. */ | |
1088 | insn = (BLE_SR4_R0 | 0x2); | |
1089 | bfd_put_32 (input_bfd, insn, hit_data + 4); | |
1090 | insn = hppa_elf_relocate_insn (input_bfd, | |
1091 | input_section, | |
1092 | insn, offset + 4, | |
1093 | value, addend, | |
1094 | r_format, r_field, | |
1095 | r_pcrel); | |
1096 | /* Update the instruction word. */ | |
1097 | bfd_put_32 (input_bfd, insn, hit_data + 4); | |
1098 | return bfd_reloc_dangerous; | |
1099 | } | |
1100 | } | |
1101 | else | |
1102 | { | |
1103 | /* PLABEL stuff is easy. */ | |
1104 | ||
1105 | value = (stub_hash->offset | |
1106 | + stub_section->output_offset | |
1107 | + stub_section->output_section->vma); | |
1108 | /* We don't need the RP adjustment for PLABELs. */ | |
1109 | value += 4; | |
1110 | if (r_type == R_PARISC_PLABEL32) | |
1111 | r_format = 32; | |
1112 | else if (r_type == R_PARISC_PLABEL21L) | |
1113 | r_format = 21; | |
1114 | else if (r_type == R_PARISC_PLABEL14R) | |
1115 | r_format = 14; | |
1116 | ||
1117 | r_pcrel = 0; | |
1118 | addend = 0; | |
1119 | } | |
1120 | } | |
1121 | else | |
1122 | return bfd_reloc_notsupported; | |
1123 | } | |
1124 | goto do_basic_type_1; | |
1125 | } | |
1126 | ||
1127 | do_basic_type_1: | |
1128 | insn = hppa_elf_relocate_insn (input_bfd, input_section, insn, | |
1129 | offset, value, addend, r_format, | |
1130 | r_field, r_pcrel); | |
1131 | break; | |
1132 | ||
1133 | /* Something we don't know how to handle. */ | |
1134 | default: | |
1135 | return bfd_reloc_notsupported; | |
1136 | } | |
1137 | ||
1138 | /* Update the instruction word. */ | |
1139 | bfd_put_32 (input_bfd, insn, hit_data); | |
1140 | return (bfd_reloc_ok); | |
1141 | } | |
1142 | ||
252b5132 RH |
1143 | /* Return true if SYM represents a local label symbol. */ |
1144 | ||
1145 | static boolean | |
1146 | hppa_elf_is_local_label_name (abfd, name) | |
1147 | bfd *abfd; | |
1148 | const char *name; | |
1149 | { | |
1150 | return (name[0] == 'L' && name[1] == '$'); | |
1151 | } | |
1152 | ||
1153 | /* Do any backend specific processing when beginning to write an object | |
1154 | file. For PA ELF we need to determine the size of the symbol extension | |
1155 | section *before* any other output processing happens. */ | |
1156 | ||
1157 | static void | |
1158 | elf32_hppa_backend_begin_write_processing (abfd, info) | |
1159 | bfd *abfd; | |
1160 | struct bfd_link_info *info; | |
1161 | { | |
1162 | unsigned int i; | |
1163 | asection *symextn_sec; | |
1164 | ||
1165 | /* Size up the symbol extension section. */ | |
1166 | if ((abfd->outsymbols == NULL | |
1167 | && info == NULL) | |
1168 | || symext_chain_size != 0) | |
1169 | return; | |
1170 | ||
1171 | if (info == NULL) | |
1172 | { | |
1173 | /* We were not called from the BFD ELF linker code, so we need | |
1174 | to examine the output BFD's outsymbols. | |
1175 | ||
1176 | Note we can not build the symbol extensions now as the symbol | |
1177 | map hasn't been set up. */ | |
1178 | for (i = 0; i < abfd->symcount; i++) | |
1179 | { | |
1180 | elf_symbol_type *symbol = (elf_symbol_type *)abfd->outsymbols[i]; | |
1181 | ||
1182 | /* Only functions ever need an entry in the symbol extension | |
1183 | section. */ | |
1184 | if (!(symbol->symbol.flags & BSF_FUNCTION)) | |
1185 | continue; | |
1186 | ||
1187 | /* And only if they specify the locations of their arguments. */ | |
1188 | if (symbol->tc_data.hppa_arg_reloc == 0) | |
1189 | continue; | |
1190 | ||
1191 | /* Yup. This function symbol needs an entry. */ | |
1192 | symext_chain_size += 2 * ELF32_PARISC_SX_SIZE; | |
1193 | } | |
1194 | } | |
1195 | else if (info->relocateable == true) | |
1196 | { | |
1197 | struct elf32_hppa_args_hash_table *table; | |
1198 | table = elf32_hppa_hash_table (info)->args_hash_table; | |
1199 | ||
1200 | /* Determine the size of the symbol extension section. */ | |
1201 | elf32_hppa_args_hash_traverse (table, | |
1202 | elf32_hppa_size_symext, | |
1203 | &symext_chain_size); | |
1204 | } | |
1205 | ||
1206 | /* Now create the section and set its size. We'll fill in the | |
1207 | contents later. */ | |
1208 | symextn_sec = bfd_get_section_by_name (abfd, SYMEXTN_SECTION_NAME); | |
1209 | if (symextn_sec == NULL) | |
1210 | symextn_sec = bfd_make_section (abfd, SYMEXTN_SECTION_NAME); | |
1211 | ||
1212 | bfd_set_section_flags (abfd, symextn_sec, | |
1213 | SEC_LOAD | SEC_HAS_CONTENTS | SEC_DATA); | |
1214 | symextn_sec->output_section = symextn_sec; | |
1215 | symextn_sec->output_offset = 0; | |
1216 | bfd_set_section_alignment (abfd, symextn_sec, 2); | |
1217 | bfd_set_section_size (abfd, symextn_sec, symext_chain_size); | |
1218 | } | |
1219 | ||
1220 | /* Called for each entry in the args location hash table. For each | |
1221 | entry we bump the size pointer by 2 records (16 bytes). */ | |
1222 | ||
1223 | static boolean | |
1224 | elf32_hppa_size_symext (gen_entry, in_args) | |
1225 | struct bfd_hash_entry *gen_entry; | |
1226 | PTR in_args; | |
1227 | { | |
1228 | bfd_size_type *sizep = (bfd_size_type *)in_args; | |
1229 | ||
1230 | *sizep += 2 * ELF32_PARISC_SX_SIZE; | |
1231 | return true; | |
1232 | } | |
1233 | ||
1234 | /* Backend routine called by the linker for each output symbol. | |
1235 | ||
1236 | For PA ELF we use this opportunity to add an appropriate entry | |
1237 | to the symbol extension chain for function symbols. */ | |
1238 | ||
1239 | static boolean | |
1240 | elf32_hppa_link_output_symbol_hook (abfd, info, name, sym, section) | |
1241 | bfd *abfd; | |
1242 | struct bfd_link_info *info; | |
1243 | const char *name; | |
1244 | Elf_Internal_Sym *sym; | |
1245 | asection *section; | |
1246 | { | |
1247 | char *new_name; | |
1248 | unsigned int len, index; | |
1249 | struct elf32_hppa_args_hash_table *args_hash_table; | |
1250 | struct elf32_hppa_args_hash_entry *args_hash; | |
1251 | ||
1252 | /* If the args hash table is NULL, then we've encountered an error | |
1253 | of some sorts (for example, an undefined symbol). In that case | |
1254 | we've got nothing else to do. | |
1255 | ||
1256 | NOTE: elf_link_output_symbol will abort if we return false here! */ | |
1257 | if (elf32_hppa_hash_table (info)->args_hash_table == NULL) | |
1258 | return true; | |
1259 | ||
1260 | index = elf32_hppa_hash_table (info)->output_symbol_count++; | |
1261 | ||
1262 | /* We need to look up this symbol in the args hash table to see if | |
1263 | it has argument relocation bits. */ | |
1264 | if (ELF_ST_TYPE (sym->st_info) != STT_FUNC) | |
1265 | return true; | |
1266 | ||
1267 | /* We know it's a function symbol of some kind. */ | |
1268 | len = strlen (name) + 1; | |
1269 | if (ELF_ST_BIND (sym->st_info) == STB_LOCAL) | |
1270 | len += 9; | |
1271 | ||
1272 | new_name = bfd_malloc (len); | |
1273 | if (new_name == NULL) | |
1274 | return false; | |
1275 | ||
1276 | strcpy (new_name, name); | |
1277 | if (ELF_ST_BIND (sym->st_info) == STB_LOCAL) | |
1278 | sprintf (new_name + len - 10, "_%08x", (int)section); | |
1279 | ||
1280 | /* Now that we have the unique name, we can look it up in the | |
1281 | args hash table. */ | |
1282 | args_hash_table = elf32_hppa_hash_table (info)->args_hash_table; | |
1283 | args_hash = elf32_hppa_args_hash_lookup (args_hash_table, new_name, | |
1284 | false, false); | |
1285 | free (new_name); | |
1286 | if (args_hash == NULL) | |
1287 | return true; | |
1288 | ||
1289 | /* We know this symbol has arg reloc bits. */ | |
1290 | add_entry_to_symext_chain (abfd, args_hash->arg_bits, | |
1291 | index, &symext_rootP, &symext_lastP); | |
1292 | return true; | |
1293 | } | |
1294 | ||
1295 | /* Perform any processing needed late in the object file writing process. | |
1296 | For PA ELF we build and set the contents of the symbol extension | |
1297 | section. */ | |
1298 | ||
1299 | static void | |
1300 | elf32_hppa_backend_final_write_processing (abfd, linker) | |
1301 | bfd *abfd; | |
1302 | boolean linker; | |
1303 | { | |
1304 | asection *symextn_sec; | |
1305 | unsigned int i; | |
1306 | ||
1307 | /* Now build the symbol extension section. */ | |
1308 | if (symext_chain_size == 0) | |
1309 | return; | |
1310 | ||
1311 | if (! linker) | |
1312 | { | |
1313 | /* We were not called from the backend linker, so we still need | |
1314 | to build the symbol extension chain. | |
1315 | ||
1316 | Look at each symbol, adding the appropriate information to the | |
1317 | symbol extension section list as necessary. */ | |
1318 | for (i = 0; i < abfd->symcount; i++) | |
1319 | { | |
1320 | elf_symbol_type *symbol = (elf_symbol_type *) abfd->outsymbols[i]; | |
1321 | ||
1322 | /* Only functions ever need an entry in the symbol extension | |
1323 | section. */ | |
1324 | if (!(symbol->symbol.flags & BSF_FUNCTION)) | |
1325 | continue; | |
1326 | ||
1327 | /* And only if they specify the locations of their arguments. */ | |
1328 | if (symbol->tc_data.hppa_arg_reloc == 0) | |
1329 | continue; | |
1330 | ||
1331 | /* Add this symbol's information to the chain. */ | |
1332 | add_entry_to_symext_chain (abfd, symbol->tc_data.hppa_arg_reloc, | |
1333 | symbol->symbol.udata.i, &symext_rootP, | |
1334 | &symext_lastP); | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | /* Now fill in the contents of the symbol extension section. */ | |
1339 | elf_hppa_tc_make_sections (abfd, symext_rootP); | |
1340 | ||
1341 | /* And attach that as the section's contents. */ | |
1342 | symextn_sec = bfd_get_section_by_name (abfd, SYMEXTN_SECTION_NAME); | |
1343 | if (symextn_sec == (asection *) 0) | |
1344 | abort(); | |
1345 | ||
1346 | symextn_sec->contents = (void *)symextn_contents; | |
1347 | ||
1348 | bfd_set_section_contents (abfd, symextn_sec, symextn_sec->contents, | |
1349 | symextn_sec->output_offset, symextn_sec->_raw_size); | |
1350 | } | |
1351 | ||
1352 | /* Update the symbol extention chain to include the symbol pointed to | |
1353 | by SYMBOLP if SYMBOLP is a function symbol. Used internally and by GAS. */ | |
1354 | ||
1355 | static void | |
1356 | add_entry_to_symext_chain (abfd, arg_reloc, sym_idx, symext_root, symext_last) | |
1357 | bfd *abfd; | |
1358 | unsigned int arg_reloc; | |
1359 | unsigned int sym_idx; | |
1360 | symext_chainS **symext_root; | |
1361 | symext_chainS **symext_last; | |
1362 | { | |
1363 | symext_chainS *symextP; | |
1364 | ||
1365 | /* Allocate memory and initialize this entry. */ | |
1366 | symextP = (symext_chainS *) bfd_alloc (abfd, sizeof (symext_chainS) * 2); | |
1367 | if (!symextP) | |
1368 | abort(); /* FIXME */ | |
1369 | ||
1370 | symextP[0].entry = ELF32_PARISC_SX_WORD (PARISC_SXT_SYMNDX, sym_idx); | |
1371 | symextP[0].next = &symextP[1]; | |
1372 | ||
1373 | symextP[1].entry = ELF32_PARISC_SX_WORD (PARISC_SXT_ARG_RELOC, arg_reloc); | |
1374 | symextP[1].next = NULL; | |
1375 | ||
1376 | /* Now update the chain itself so it can be walked later to build | |
1377 | the symbol extension section. */ | |
1378 | if (*symext_root == NULL) | |
1379 | { | |
1380 | *symext_root = &symextP[0]; | |
1381 | *symext_last = &symextP[1]; | |
1382 | } | |
1383 | else | |
1384 | { | |
1385 | (*symext_last)->next = &symextP[0]; | |
1386 | *symext_last = &symextP[1]; | |
1387 | } | |
1388 | } | |
1389 | ||
1390 | /* Build the symbol extension section. */ | |
1391 | ||
1392 | static void | |
1393 | elf_hppa_tc_make_sections (abfd, symext_root) | |
1394 | bfd *abfd; | |
1395 | symext_chainS *symext_root; | |
1396 | { | |
1397 | symext_chainS *symextP; | |
1398 | unsigned int i; | |
1399 | asection *symextn_sec; | |
1400 | ||
1401 | symextn_sec = bfd_get_section_by_name (abfd, SYMEXTN_SECTION_NAME); | |
1402 | ||
1403 | /* Grab some memory for the contents of the symbol extension section | |
1404 | itself. */ | |
1405 | symextn_contents = (bfd_byte *) bfd_zalloc (abfd, | |
1406 | symextn_sec->_raw_size); | |
1407 | if (!symextn_contents) | |
1408 | abort(); /* FIXME */ | |
1409 | ||
1410 | /* Fill in the contents of the symbol extension chain. */ | |
1411 | for (i = 0, symextP = symext_root; symextP; symextP = symextP->next, ++i) | |
1412 | ELF32_PARISC_SX_PUT (abfd, (bfd_vma) symextP->entry, | |
1413 | symextn_contents + i * ELF32_PARISC_SX_SIZE); | |
1414 | ||
1415 | return; | |
1416 | } | |
1417 | ||
1418 | /* Do some PA ELF specific work after reading in the symbol table. | |
1419 | In particular attach the argument relocation from the | |
1420 | symbol extension section to the appropriate symbols. */ | |
1421 | ||
1422 | static boolean | |
1423 | elf32_hppa_backend_symbol_table_processing (abfd, esyms,symcnt) | |
1424 | bfd *abfd; | |
1425 | elf_symbol_type *esyms; | |
1426 | unsigned int symcnt; | |
1427 | { | |
1428 | Elf32_Internal_Shdr *symextn_hdr = | |
1429 | bfd_elf_find_section (abfd, SYMEXTN_SECTION_NAME); | |
1430 | unsigned int i, current_sym_idx = 0; | |
1431 | ||
1432 | /* If no symbol extension existed, then all symbol extension information | |
1433 | is assumed to be zero. */ | |
1434 | if (symextn_hdr == NULL) | |
1435 | { | |
1436 | for (i = 0; i < symcnt; i++) | |
1437 | esyms[i].tc_data.hppa_arg_reloc = 0; | |
1438 | return (true); | |
1439 | } | |
1440 | ||
1441 | /* FIXME: Why not use bfd_get_section_contents here? Also should give | |
1442 | memory back when we're done. */ | |
1443 | /* Allocate a buffer of the appropriate size for the symextn section. */ | |
1444 | symextn_hdr->contents = bfd_zalloc(abfd,symextn_hdr->sh_size); | |
1445 | if (!symextn_hdr->contents) | |
1446 | return false; | |
1447 | ||
1448 | /* Read in the symextn section. */ | |
1449 | if (bfd_seek (abfd, symextn_hdr->sh_offset, SEEK_SET) == -1) | |
1450 | return false; | |
1451 | if (bfd_read ((PTR) symextn_hdr->contents, 1, symextn_hdr->sh_size, abfd) | |
1452 | != symextn_hdr->sh_size) | |
1453 | return false; | |
1454 | ||
1455 | /* Parse entries in the symbol extension section, updating the symtab | |
1456 | entries as we go */ | |
1457 | for (i = 0; i < symextn_hdr->sh_size / ELF32_PARISC_SX_SIZE; i++) | |
1458 | { | |
1459 | symext_entryS se = | |
1460 | ELF32_PARISC_SX_GET (abfd, | |
1461 | ((unsigned char *)symextn_hdr->contents | |
1462 | + i * ELF32_PARISC_SX_SIZE)); | |
1463 | unsigned int se_value = ELF32_PARISC_SX_VAL (se); | |
1464 | unsigned int se_type = ELF32_PARISC_SX_TYPE (se); | |
1465 | ||
1466 | switch (se_type) | |
1467 | { | |
1468 | case PARISC_SXT_NULL: | |
1469 | break; | |
1470 | ||
1471 | case PARISC_SXT_SYMNDX: | |
1472 | if (se_value >= symcnt) | |
1473 | { | |
1474 | bfd_set_error (bfd_error_bad_value); | |
1475 | return (false); | |
1476 | } | |
1477 | current_sym_idx = se_value - 1; | |
1478 | break; | |
1479 | ||
1480 | case PARISC_SXT_ARG_RELOC: | |
1481 | esyms[current_sym_idx].tc_data.hppa_arg_reloc = se_value; | |
1482 | break; | |
1483 | ||
1484 | default: | |
1485 | bfd_set_error (bfd_error_bad_value); | |
1486 | return (false); | |
1487 | } | |
1488 | } | |
1489 | return (true); | |
1490 | } | |
1491 | ||
1492 | /* Read and attach the symbol extension information for the symbols | |
1493 | in INPUT_BFD to the argument location hash table. Handle locals | |
1494 | if DO_LOCALS is true; likewise for globals when DO_GLOBALS is true. */ | |
1495 | ||
1496 | static boolean | |
1497 | elf32_hppa_read_symext_info (input_bfd, symtab_hdr, args_hash_table, local_syms) | |
1498 | bfd *input_bfd; | |
1499 | Elf_Internal_Shdr *symtab_hdr; | |
1500 | struct elf32_hppa_args_hash_table *args_hash_table; | |
1501 | Elf_Internal_Sym *local_syms; | |
1502 | { | |
1503 | asection *symextn_sec; | |
1504 | bfd_byte *contents; | |
1505 | unsigned int i, n_entries, current_index = 0; | |
1506 | ||
1507 | /* Get the symbol extension section for this BFD. If no section exists | |
1508 | then there's nothing to do. Likewise if the section exists, but | |
1509 | has no contents. */ | |
1510 | symextn_sec = bfd_get_section_by_name (input_bfd, SYMEXTN_SECTION_NAME); | |
1511 | if (symextn_sec == NULL) | |
1512 | return true; | |
1513 | ||
1514 | /* Done separately so we can turn off SEC_HAS_CONTENTS (see below). */ | |
1515 | if (symextn_sec->_raw_size == 0) | |
1516 | { | |
1517 | symextn_sec->flags &= ~SEC_HAS_CONTENTS; | |
1518 | return true; | |
1519 | } | |
1520 | ||
1521 | contents = (bfd_byte *) bfd_malloc ((size_t) symextn_sec->_raw_size); | |
1522 | if (contents == NULL) | |
1523 | return false; | |
1524 | ||
1525 | /* How gross. We turn off SEC_HAS_CONTENTS for the input symbol extension | |
1526 | sections to keep the generic ELF/BFD code from trying to do anything | |
1527 | with them. We have to undo that hack temporarily so that we can read | |
1528 | in the contents with the generic code. */ | |
1529 | symextn_sec->flags |= SEC_HAS_CONTENTS; | |
1530 | if (bfd_get_section_contents (input_bfd, symextn_sec, contents, | |
1531 | 0, symextn_sec->_raw_size) == false) | |
1532 | { | |
1533 | symextn_sec->flags &= ~SEC_HAS_CONTENTS; | |
1534 | free (contents); | |
1535 | return false; | |
1536 | } | |
1537 | ||
1538 | /* Gross. Turn off SEC_HAS_CONTENTS for the input symbol extension | |
1539 | sections (see above). */ | |
1540 | symextn_sec->flags &= ~SEC_HAS_CONTENTS; | |
1541 | ||
1542 | n_entries = symextn_sec->_raw_size / ELF32_PARISC_SX_SIZE; | |
1543 | for (i = 0; i < n_entries; i++) | |
1544 | { | |
1545 | symext_entryS entry = | |
1546 | ELF32_PARISC_SX_GET (input_bfd, contents + i * ELF32_PARISC_SX_SIZE); | |
1547 | unsigned int value = ELF32_PARISC_SX_VAL (entry); | |
1548 | unsigned int type = ELF32_PARISC_SX_TYPE (entry); | |
1549 | struct elf32_hppa_args_hash_entry *args_hash; | |
1550 | ||
1551 | switch (type) | |
1552 | { | |
1553 | case PARISC_SXT_NULL: | |
1554 | break; | |
1555 | ||
1556 | case PARISC_SXT_SYMNDX: | |
1557 | if (value >= symtab_hdr->sh_size / sizeof (Elf32_External_Sym)) | |
1558 | { | |
1559 | bfd_set_error (bfd_error_bad_value); | |
1560 | free (contents); | |
1561 | return false; | |
1562 | } | |
1563 | current_index = value; | |
1564 | break; | |
1565 | ||
1566 | case PARISC_SXT_ARG_RELOC: | |
1567 | if (current_index < symtab_hdr->sh_info) | |
1568 | { | |
1569 | Elf_Internal_Shdr *hdr; | |
1570 | char *new_name; | |
1571 | const char *sym_name; | |
1572 | asection *sym_sec; | |
1573 | unsigned int len; | |
1574 | ||
1575 | hdr = elf_elfsections (input_bfd)[local_syms[current_index].st_shndx]; | |
1576 | sym_sec = hdr->bfd_section; | |
1577 | sym_name = bfd_elf_string_from_elf_section (input_bfd, | |
1578 | symtab_hdr->sh_link, | |
1579 | local_syms[current_index].st_name); | |
1580 | len = strlen (sym_name) + 10; | |
1581 | new_name = bfd_malloc (len); | |
1582 | if (new_name == NULL) | |
1583 | { | |
1584 | free (contents); | |
1585 | return false; | |
1586 | } | |
1587 | strcpy (new_name, sym_name); | |
1588 | sprintf (new_name + len - 10, "_%08x", (int)sym_sec); | |
1589 | ||
1590 | /* This is a global symbol with argument location info. | |
1591 | We need to enter it into the hash table. */ | |
1592 | args_hash = elf32_hppa_args_hash_lookup (args_hash_table, | |
1593 | new_name, true, | |
1594 | true); | |
1595 | free (new_name); | |
1596 | if (args_hash == NULL) | |
1597 | { | |
1598 | free (contents); | |
1599 | return false; | |
1600 | } | |
1601 | args_hash->arg_bits = value; | |
1602 | break; | |
1603 | } | |
1604 | else if (current_index >= symtab_hdr->sh_info) | |
1605 | { | |
1606 | struct elf_link_hash_entry *h; | |
1607 | ||
1608 | current_index -= symtab_hdr->sh_info; | |
1609 | h = elf_sym_hashes(input_bfd)[current_index]; | |
1610 | /* This is a global symbol with argument location | |
1611 | information. We need to enter it into the hash table. */ | |
1612 | args_hash = elf32_hppa_args_hash_lookup (args_hash_table, | |
1613 | h->root.root.string, | |
1614 | true, true); | |
1615 | if (args_hash == NULL) | |
1616 | { | |
1617 | bfd_set_error (bfd_error_bad_value); | |
1618 | free (contents); | |
1619 | return false; | |
1620 | } | |
1621 | args_hash->arg_bits = value; | |
1622 | break; | |
1623 | } | |
1624 | else | |
1625 | break; | |
1626 | ||
1627 | default: | |
1628 | bfd_set_error (bfd_error_bad_value); | |
1629 | free (contents); | |
1630 | return false; | |
1631 | } | |
1632 | } | |
1633 | free (contents); | |
1634 | return true; | |
1635 | } | |
1636 | ||
1637 | /* Undo the generic ELF code's subtraction of section->vma from the | |
1638 | value of each external symbol. */ | |
1639 | ||
1640 | static boolean | |
1641 | elf32_hppa_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) | |
1642 | bfd *abfd; | |
1643 | struct bfd_link_info *info; | |
1644 | const Elf_Internal_Sym *sym; | |
1645 | const char **namep; | |
1646 | flagword *flagsp; | |
1647 | asection **secp; | |
1648 | bfd_vma *valp; | |
1649 | { | |
1650 | *valp += (*secp)->vma; | |
1651 | return true; | |
1652 | } | |
1653 | ||
1654 | /* Determine the name of the stub needed to perform a call assuming the | |
1655 | argument relocation bits for caller and callee are in CALLER and CALLEE | |
1656 | for a call from LOCATION to DESTINATION. Copy the name into STUB_NAME. */ | |
1657 | ||
1658 | static void | |
1659 | elf32_hppa_name_of_stub (caller, callee, location, destination, stub_name) | |
1660 | unsigned int caller, callee; | |
1661 | bfd_vma location, destination; | |
1662 | char *stub_name; | |
1663 | { | |
1664 | arg_reloc_type arg_reloc_types[5]; | |
1665 | ||
1666 | if (elf32_hppa_arg_reloc_needed (caller, callee, arg_reloc_types)) | |
1667 | { | |
1668 | arg_reloc_location i; | |
1669 | /* Fill in the basic template. */ | |
1670 | strcpy (stub_name, "__XX_XX_XX_XX_XX_stub_"); | |
1671 | ||
1672 | /* Now fix the specifics. */ | |
1673 | for (i = ARG0; i <= RET; i++) | |
1674 | switch (arg_reloc_types[i]) | |
1675 | { | |
1676 | case NO: | |
1677 | stub_name[3 * i + 2] = 'N'; | |
1678 | stub_name[3 * i + 3] = 'O'; | |
1679 | break; | |
1680 | case GF: | |
1681 | stub_name[3 * i + 2] = 'G'; | |
1682 | stub_name[3 * i + 3] = 'F'; | |
1683 | break; | |
1684 | case FG: | |
1685 | stub_name[3 * i + 2] = 'F'; | |
1686 | stub_name[3 * i + 3] = 'G'; | |
1687 | break; | |
1688 | case GD: | |
1689 | stub_name[3 * i + 2] = 'G'; | |
1690 | stub_name[3 * i + 3] = 'D'; | |
1691 | break; | |
1692 | case DG: | |
1693 | stub_name[3 * i + 2] = 'D'; | |
1694 | stub_name[3 * i + 3] = 'G'; | |
1695 | break; | |
1696 | } | |
1697 | } | |
1698 | else | |
1699 | strcpy (stub_name, "_____long_branch_stub_"); | |
1700 | } | |
1701 | ||
1702 | /* Determine if an argument relocation stub is needed to perform a | |
1703 | call assuming the argument relocation bits for caller and callee | |
1704 | are in CALLER and CALLEE. Place the type of relocations (if any) | |
1705 | into stub_types_p. */ | |
1706 | ||
1707 | static boolean | |
1708 | elf32_hppa_arg_reloc_needed (caller, callee, stub_types) | |
1709 | unsigned int caller, callee; | |
1710 | arg_reloc_type stub_types[5]; | |
1711 | { | |
1712 | /* Special case for no relocations. */ | |
1713 | if (caller == 0 || callee == 0) | |
1714 | return 0; | |
1715 | else | |
1716 | { | |
1717 | arg_location caller_loc[5]; | |
1718 | arg_location callee_loc[5]; | |
1719 | ||
1720 | /* Extract the location information for the argument and return | |
1721 | value on both the caller and callee sides. */ | |
1722 | caller_loc[ARG0] = EXTRACT_ARBITS (caller, ARG0); | |
1723 | callee_loc[ARG0] = EXTRACT_ARBITS (callee, ARG0); | |
1724 | caller_loc[ARG1] = EXTRACT_ARBITS (caller, ARG1); | |
1725 | callee_loc[ARG1] = EXTRACT_ARBITS (callee, ARG1); | |
1726 | caller_loc[ARG2] = EXTRACT_ARBITS (caller, ARG2); | |
1727 | callee_loc[ARG2] = EXTRACT_ARBITS (callee, ARG2); | |
1728 | caller_loc[ARG3] = EXTRACT_ARBITS (caller, ARG3); | |
1729 | callee_loc[ARG3] = EXTRACT_ARBITS (callee, ARG3); | |
1730 | caller_loc[RET] = EXTRACT_ARBITS (caller, RET); | |
1731 | callee_loc[RET] = EXTRACT_ARBITS (callee, RET); | |
1732 | ||
1733 | /* Check some special combinations. This is necessary to | |
1734 | deal with double precision FP arguments. */ | |
1735 | if (caller_loc[ARG0] == AR_FU || caller_loc[ARG1] == AR_FU) | |
1736 | { | |
1737 | caller_loc[ARG0] = AR_FPDBL1; | |
1738 | caller_loc[ARG1] = AR_NO; | |
1739 | } | |
1740 | if (caller_loc[ARG2] == AR_FU || caller_loc[ARG3] == AR_FU) | |
1741 | { | |
1742 | caller_loc[ARG2] = AR_FPDBL2; | |
1743 | caller_loc[ARG3] = AR_NO; | |
1744 | } | |
1745 | if (callee_loc[ARG0] == AR_FU || callee_loc[ARG1] == AR_FU) | |
1746 | { | |
1747 | callee_loc[ARG0] = AR_FPDBL1; | |
1748 | callee_loc[ARG1] = AR_NO; | |
1749 | } | |
1750 | if (callee_loc[ARG2] == AR_FU || callee_loc[ARG3] == AR_FU) | |
1751 | { | |
1752 | callee_loc[ARG2] = AR_FPDBL2; | |
1753 | callee_loc[ARG3] = AR_NO; | |
1754 | } | |
1755 | ||
1756 | /* Now look up any relocation needed for each argument and the | |
1757 | return value. */ | |
1758 | stub_types[ARG0] = arg_mismatches[caller_loc[ARG0]][callee_loc[ARG0]]; | |
1759 | stub_types[ARG1] = arg_mismatches[caller_loc[ARG1]][callee_loc[ARG1]]; | |
1760 | stub_types[ARG2] = arg_mismatches[caller_loc[ARG2]][callee_loc[ARG2]]; | |
1761 | stub_types[ARG3] = arg_mismatches[caller_loc[ARG3]][callee_loc[ARG3]]; | |
1762 | stub_types[RET] = ret_mismatches[caller_loc[RET]][callee_loc[RET]]; | |
1763 | ||
1764 | return (stub_types[ARG0] != NO | |
1765 | || stub_types[ARG1] != NO | |
1766 | || stub_types[ARG2] != NO | |
1767 | || stub_types[ARG3] != NO | |
1768 | || stub_types[RET] != NO); | |
1769 | } | |
1770 | } | |
1771 | ||
1772 | /* Compute the size of the stub needed to call from LOCATION to DESTINATION | |
1773 | (a function named SYM_NAME), with argument relocation bits CALLER and | |
1774 | CALLEE. Return zero if no stub is needed to perform such a call. */ | |
1775 | ||
1776 | static unsigned int | |
1777 | elf32_hppa_size_of_stub (callee, caller, location, destination, sym_name) | |
1778 | unsigned int callee, caller; | |
1779 | bfd_vma location, destination; | |
1780 | const char *sym_name; | |
1781 | { | |
1782 | arg_reloc_type arg_reloc_types[5]; | |
1783 | ||
1784 | /* Determine if a long branch or argument relocation stub is needed. | |
1785 | If an argument relocation stub is needed, the relocation will be | |
1786 | stored into arg_reloc_types. */ | |
1787 | if (!(((int)(location - destination) > 0x3ffff) | |
1788 | || ((int)(location - destination) < (int)0xfffc0000) | |
1789 | || elf32_hppa_arg_reloc_needed (caller, callee, arg_reloc_types))) | |
1790 | return 0; | |
1791 | ||
1792 | /* Some kind of stub is needed. Determine how big it needs to be. | |
1793 | First check for argument relocation stubs as they also handle | |
1794 | long calls. Then check for long calls to millicode and finally | |
1795 | the normal long calls. */ | |
1796 | if (arg_reloc_types[ARG0] != NO | |
1797 | || arg_reloc_types[ARG1] != NO | |
1798 | || arg_reloc_types[ARG2] != NO | |
1799 | || arg_reloc_types[ARG3] != NO | |
1800 | || arg_reloc_types[RET] != NO) | |
1801 | { | |
1802 | /* Some kind of argument relocation stub is needed. */ | |
1803 | unsigned int len = 16; | |
1804 | arg_reloc_location i; | |
1805 | ||
1806 | /* Each GR or FG relocation takes 2 insns, each GD or DG | |
1807 | relocation takes 3 insns. Plus 4 more insns for the | |
1808 | RP adjustment, ldil & (be | ble) and copy. */ | |
1809 | for (i = ARG0; i <= RET; i++) | |
1810 | switch (arg_reloc_types[i]) | |
1811 | { | |
1812 | case GF: | |
1813 | case FG: | |
1814 | len += 8; | |
1815 | break; | |
1816 | ||
1817 | case GD: | |
1818 | case DG: | |
1819 | len += 12; | |
1820 | break; | |
1821 | ||
1822 | default: | |
1823 | break; | |
1824 | } | |
1825 | ||
1826 | /* Extra instructions are needed if we're relocating a return value. */ | |
1827 | if (arg_reloc_types[RET] != NO) | |
1828 | len += 12; | |
1829 | ||
1830 | return len; | |
1831 | } | |
1832 | else if (!strncmp ("$$", sym_name, 2) | |
1833 | && strcmp ("$$dyncall", sym_name)) | |
1834 | return 12; | |
1835 | else | |
1836 | return 16; | |
1837 | } | |
1838 | ||
1839 | /* Build one linker stub as defined by the stub hash table entry GEN_ENTRY. | |
1840 | IN_ARGS contains the stub BFD and link info pointers. */ | |
1841 | ||
1842 | static boolean | |
1843 | elf32_hppa_build_one_stub (gen_entry, in_args) | |
1844 | struct bfd_hash_entry *gen_entry; | |
1845 | PTR in_args; | |
1846 | { | |
1847 | void **args = (void **)in_args; | |
1848 | bfd *stub_bfd = (bfd *)args[0]; | |
1849 | struct bfd_link_info *info = (struct bfd_link_info *)args[1]; | |
1850 | struct elf32_hppa_stub_hash_entry *entry; | |
1851 | struct elf32_hppa_stub_hash_table *stub_hash_table; | |
1852 | bfd_byte *loc; | |
1853 | symvalue sym_value; | |
1854 | const char *sym_name; | |
1855 | ||
1856 | /* Initialize pointers to the stub hash table, the particular entry we | |
1857 | are building a stub for, and where (in memory) we should place the stub | |
1858 | instructions. */ | |
1859 | entry = (struct elf32_hppa_stub_hash_entry *)gen_entry; | |
1860 | stub_hash_table = elf32_hppa_hash_table(info)->stub_hash_table; | |
1861 | loc = stub_hash_table->location; | |
1862 | ||
1863 | /* Make a note of the offset within the stubs for this entry. */ | |
1864 | entry->offset = stub_hash_table->offset; | |
1865 | ||
1866 | /* The symbol's name starts at offset 22. */ | |
1867 | sym_name = entry->root.string + 22; | |
1868 | ||
1869 | sym_value = (entry->target_value | |
1870 | + entry->target_section->output_offset | |
1871 | + entry->target_section->output_section->vma); | |
1872 | ||
1873 | if (strncmp ("_____long_branch_stub_", entry->root.string, 22)) | |
1874 | { | |
1875 | /* This must be an argument or return value relocation stub. */ | |
1876 | unsigned long insn; | |
1877 | arg_reloc_location i; | |
1878 | bfd_byte *begin_loc = loc; | |
1879 | ||
1880 | /* First the return pointer adjustment. Depending on exact calling | |
1881 | sequence this instruction may be skipped. */ | |
1882 | bfd_put_32 (stub_bfd, LDO_M4_R31_R31, loc); | |
1883 | loc += 4; | |
1884 | ||
1885 | /* If we are relocating a return value, then we're going to have | |
1886 | to return into the stub. So we have to save off the user's | |
1887 | return pointer into the stack at RP'. */ | |
1888 | if (strncmp (entry->root.string + 14, "NO", 2)) | |
1889 | { | |
1890 | bfd_put_32 (stub_bfd, STW_R31_M8R30, loc); | |
1891 | loc += 4; | |
1892 | } | |
1893 | ||
1894 | /* Iterate over the argument relocations, emitting instructions | |
1895 | to move them around as necessary. */ | |
1896 | for (i = ARG0; i <= ARG3; i++) | |
1897 | { | |
1898 | if (!strncmp (entry->root.string + 3 * i + 2, "GF", 2)) | |
1899 | { | |
1900 | bfd_put_32 (stub_bfd, STW_ARG_M16R30 | ((26 - i) << 16), loc); | |
1901 | bfd_put_32 (stub_bfd, FLDW_M16R30_FARG | (4 + i), loc + 4); | |
1902 | loc += 8; | |
1903 | } | |
1904 | else if (!strncmp (entry->root.string + 3 * i + 2, "FG", 2)) | |
1905 | { | |
1906 | bfd_put_32 (stub_bfd, FSTW_FARG_M16R30 | (4 + i), loc); | |
1907 | bfd_put_32 (stub_bfd, LDW_M16R30_ARG | ((26 - i) << 16), loc + 4); | |
1908 | loc += 8; | |
1909 | } | |
1910 | else if (!strncmp (entry->root.string + 3 * i + 2, "GD", 2)) | |
1911 | { | |
1912 | bfd_put_32 (stub_bfd, STW_ARG_M12R30 | ((26 - i) << 16), loc); | |
1913 | bfd_put_32 (stub_bfd, STW_ARG_M16R30 | ((25 - i) << 16), loc + 4); | |
1914 | bfd_put_32 (stub_bfd, FLDD_M16R30_FARG | (5 + i), loc + 8); | |
1915 | loc += 12; | |
1916 | } | |
1917 | else if (!strncmp (entry->root.string + 3 * i + 2, "DG", 2)) | |
1918 | { | |
1919 | bfd_put_32 (stub_bfd, FSTD_FARG_M16R30 | (5 + i), loc); | |
1920 | bfd_put_32 (stub_bfd, LDW_M12R30_ARG | ((26 - i) << 16), loc + 4); | |
1921 | bfd_put_32 (stub_bfd, LDW_M16R30_ARG | ((25 - i) << 16), loc + 8); | |
1922 | loc += 12; | |
1923 | } | |
1924 | } | |
1925 | ||
1926 | /* Load the high bits of the target address into %r1. */ | |
1927 | insn = hppa_rebuild_insn (stub_bfd, LDIL_R1, | |
1928 | hppa_field_adjust (sym_value, 0, e_lrsel), 21); | |
1929 | bfd_put_32 (stub_bfd, insn, loc); | |
1930 | loc += 4; | |
1931 | ||
1932 | /* If we are relocating a return value, then we're going to have | |
1933 | to return into the stub, then perform the return value relocation. */ | |
1934 | if (strncmp (entry->root.string + 14, "NO", 2)) | |
1935 | { | |
1936 | /* To return to the stub we "ble" to the target and copy the return | |
1937 | pointer from %r31 into %r2. */ | |
1938 | insn = hppa_rebuild_insn (stub_bfd, | |
1939 | BLE_SR4_R1, | |
1940 | hppa_field_adjust (sym_value, 0, | |
1941 | e_rrsel) >> 2, | |
1942 | 17); | |
1943 | bfd_put_32 (stub_bfd, insn, loc); | |
1944 | bfd_put_32 (stub_bfd, COPY_R31_R2, loc + 4); | |
1945 | ||
1946 | /* Reload the return pointer for our caller from the stack. */ | |
1947 | bfd_put_32 (stub_bfd, LDW_M8R30_R31, loc + 8); | |
1948 | loc += 12; | |
1949 | ||
1950 | /* Perform the return value relocation. */ | |
1951 | if (!strncmp (entry->root.string + 14, "GF", 2)) | |
1952 | { | |
1953 | bfd_put_32 (stub_bfd, STW_ARG_M16R30 | (28 << 16), loc); | |
1954 | bfd_put_32 (stub_bfd, FLDW_M16R30_FARG | 4, loc + 4); | |
1955 | loc += 8; | |
1956 | } | |
1957 | else if (!strncmp (entry->root.string + 14, "FG", 2)) | |
1958 | { | |
1959 | bfd_put_32 (stub_bfd, FSTW_FARG_M16R30 | 4, loc); | |
1960 | bfd_put_32 (stub_bfd, LDW_M16R30_ARG | (28 << 16), loc + 4); | |
1961 | loc += 8; | |
1962 | } | |
1963 | else if (!strncmp (entry->root.string + 2, "GD", 2)) | |
1964 | { | |
1965 | bfd_put_32 (stub_bfd, STW_ARG_M12R30 | (28 << 16), loc); | |
1966 | bfd_put_32 (stub_bfd, STW_ARG_M16R30 | (29 << 16), loc + 4); | |
1967 | bfd_put_32 (stub_bfd, FLDD_M16R30_FARG | 4, loc + 8); | |
1968 | loc += 12; | |
1969 | } | |
1970 | else if (!strncmp (entry->root.string + 2, "DG", 2)) | |
1971 | { | |
1972 | bfd_put_32 (stub_bfd, FSTD_FARG_M16R30 | 4, loc); | |
1973 | bfd_put_32 (stub_bfd, LDW_M12R30_ARG | (28 << 16), loc + 4); | |
1974 | bfd_put_32 (stub_bfd, LDW_M16R30_ARG | (29 << 16), loc + 8); | |
1975 | loc += 12; | |
1976 | } | |
1977 | /* Branch back to the user's code now. */ | |
1978 | bfd_put_32 (stub_bfd, BV_N_0_R31, loc); | |
1979 | loc += 4; | |
1980 | } | |
1981 | else | |
1982 | { | |
1983 | /* No return value relocation, so we can simply "be" to the | |
1984 | target and copy out return pointer into %r2. */ | |
1985 | insn = hppa_rebuild_insn (stub_bfd, BE_SR4_R1, | |
1986 | hppa_field_adjust (sym_value, 0, | |
1987 | e_rrsel) >> 2, 17); | |
1988 | bfd_put_32 (stub_bfd, insn, loc); | |
1989 | bfd_put_32 (stub_bfd, COPY_R31_R2, loc + 4); | |
1990 | loc += 8; | |
1991 | } | |
1992 | ||
1993 | /* Update the location and offsets. */ | |
1994 | stub_hash_table->location += (loc - begin_loc); | |
1995 | stub_hash_table->offset += (loc - begin_loc); | |
1996 | } | |
1997 | else | |
1998 | { | |
1999 | /* Create one of two variant long branch stubs. One for $$dyncall and | |
2000 | normal calls, the other for calls to millicode. */ | |
2001 | unsigned long insn; | |
2002 | int millicode_call = 0; | |
2003 | ||
2004 | if (!strncmp ("$$", sym_name, 2) && strcmp ("$$dyncall", sym_name)) | |
2005 | millicode_call = 1; | |
2006 | ||
2007 | /* First the return pointer adjustment. Depending on exact calling | |
2008 | sequence this instruction may be skipped. */ | |
2009 | bfd_put_32 (stub_bfd, LDO_M4_R31_R31, loc); | |
2010 | ||
2011 | /* The next two instructions are the long branch itself. A long branch | |
2012 | is formed with "ldil" loading the upper bits of the target address | |
2013 | into a register, then branching with "be" which adds in the lower bits. | |
2014 | Long branches to millicode nullify the delay slot of the "be". */ | |
2015 | insn = hppa_rebuild_insn (stub_bfd, LDIL_R1, | |
2016 | hppa_field_adjust (sym_value, 0, e_lrsel), 21); | |
2017 | bfd_put_32 (stub_bfd, insn, loc + 4); | |
2018 | insn = hppa_rebuild_insn (stub_bfd, BE_SR4_R1 | (millicode_call ? 2 : 0), | |
2019 | hppa_field_adjust (sym_value, 0, e_rrsel) >> 2, | |
2020 | 17); | |
2021 | bfd_put_32 (stub_bfd, insn, loc + 8); | |
2022 | ||
2023 | if (!millicode_call) | |
2024 | { | |
2025 | /* The sequence to call this stub places the return pointer into %r31, | |
2026 | the final target expects the return pointer in %r2, so copy the | |
2027 | return pointer into the proper register. */ | |
2028 | bfd_put_32 (stub_bfd, COPY_R31_R2, loc + 12); | |
2029 | ||
2030 | /* Update the location and offsets. */ | |
2031 | stub_hash_table->location += 16; | |
2032 | stub_hash_table->offset += 16; | |
2033 | } | |
2034 | else | |
2035 | { | |
2036 | /* Update the location and offsets. */ | |
2037 | stub_hash_table->location += 12; | |
2038 | stub_hash_table->offset += 12; | |
2039 | } | |
2040 | ||
2041 | } | |
2042 | return true; | |
2043 | } | |
2044 | ||
2045 | /* External entry points for sizing and building linker stubs. */ | |
2046 | ||
2047 | /* Build all the stubs associated with the current output file. The | |
2048 | stubs are kept in a hash table attached to the main linker hash | |
2049 | table. This is called via hppaelf_finish in the linker. */ | |
2050 | ||
2051 | boolean | |
2052 | elf32_hppa_build_stubs (stub_bfd, info) | |
2053 | bfd *stub_bfd; | |
2054 | struct bfd_link_info *info; | |
2055 | { | |
2056 | /* The stub BFD only has one section. */ | |
2057 | asection *stub_sec = stub_bfd->sections; | |
2058 | struct elf32_hppa_stub_hash_table *table; | |
2059 | unsigned int size; | |
2060 | void *args[2]; | |
2061 | ||
2062 | /* So we can pass both the BFD for the stubs and the link info | |
2063 | structure to the routine which actually builds stubs. */ | |
2064 | args[0] = stub_bfd; | |
2065 | args[1] = info; | |
2066 | ||
2067 | /* Allocate memory to hold the linker stubs. */ | |
2068 | size = bfd_section_size (stub_bfd, stub_sec); | |
2069 | stub_sec->contents = (unsigned char *) bfd_zalloc (stub_bfd, size); | |
2070 | if (stub_sec->contents == NULL) | |
2071 | return false; | |
2072 | table = elf32_hppa_hash_table(info)->stub_hash_table; | |
2073 | table->location = stub_sec->contents; | |
2074 | ||
2075 | /* Build the stubs as directed by the stub hash table. */ | |
2076 | elf32_hppa_stub_hash_traverse (table, elf32_hppa_build_one_stub, args); | |
2077 | ||
2078 | return true; | |
2079 | } | |
2080 | ||
2081 | /* Determine and set the size of the stub section for a final link. | |
2082 | ||
2083 | The basic idea here is to examine all the relocations looking for | |
2084 | PC-relative calls to a target that is unreachable with a "bl" | |
2085 | instruction or calls where the caller and callee disagree on the | |
2086 | location of their arguments or return value. */ | |
2087 | ||
2088 | boolean | |
2089 | elf32_hppa_size_stubs (stub_bfd, output_bfd, link_info) | |
2090 | bfd *stub_bfd; | |
2091 | bfd *output_bfd; | |
2092 | struct bfd_link_info *link_info; | |
2093 | { | |
2094 | bfd *input_bfd; | |
2095 | asection *section, *stub_sec = 0; | |
2096 | Elf_Internal_Shdr *symtab_hdr; | |
2097 | Elf_Internal_Sym *local_syms, *isym, **all_local_syms; | |
2098 | Elf32_External_Sym *ext_syms, *esym; | |
2099 | unsigned int i, index, bfd_count = 0; | |
2100 | struct elf32_hppa_stub_hash_table *stub_hash_table = 0; | |
2101 | struct elf32_hppa_args_hash_table *args_hash_table = 0; | |
2102 | ||
2103 | /* Create and initialize the stub hash table. */ | |
2104 | stub_hash_table = ((struct elf32_hppa_stub_hash_table *) | |
2105 | bfd_malloc (sizeof (struct elf32_hppa_stub_hash_table))); | |
2106 | if (!stub_hash_table) | |
2107 | goto error_return; | |
2108 | ||
2109 | if (!elf32_hppa_stub_hash_table_init (stub_hash_table, stub_bfd, | |
2110 | elf32_hppa_stub_hash_newfunc)) | |
2111 | goto error_return; | |
2112 | ||
2113 | /* Likewise for the argument location hash table. */ | |
2114 | args_hash_table = ((struct elf32_hppa_args_hash_table *) | |
2115 | bfd_malloc (sizeof (struct elf32_hppa_args_hash_table))); | |
2116 | if (!args_hash_table) | |
2117 | goto error_return; | |
2118 | ||
2119 | if (!elf32_hppa_args_hash_table_init (args_hash_table, | |
2120 | elf32_hppa_args_hash_newfunc)) | |
2121 | goto error_return; | |
2122 | ||
2123 | /* Attach the hash tables to the main hash table. */ | |
2124 | elf32_hppa_hash_table(link_info)->stub_hash_table = stub_hash_table; | |
2125 | elf32_hppa_hash_table(link_info)->args_hash_table = args_hash_table; | |
2126 | ||
2127 | /* Count the number of input BFDs. */ | |
2128 | for (input_bfd = link_info->input_bfds; | |
2129 | input_bfd != NULL; | |
2130 | input_bfd = input_bfd->link_next) | |
2131 | bfd_count++; | |
2132 | ||
2133 | /* We want to read in symbol extension records only once. To do this | |
2134 | we need to read in the local symbols in parallel and save them for | |
2135 | later use; so hold pointers to the local symbols in an array. */ | |
2136 | all_local_syms | |
2137 | = (Elf_Internal_Sym **) bfd_malloc (sizeof (Elf_Internal_Sym *) | |
2138 | * bfd_count); | |
2139 | if (all_local_syms == NULL) | |
2140 | goto error_return; | |
2141 | memset (all_local_syms, 0, sizeof (Elf_Internal_Sym *) * bfd_count); | |
2142 | ||
2143 | /* Walk over all the input BFDs adding entries to the args hash table | |
2144 | for all the external functions. */ | |
2145 | for (input_bfd = link_info->input_bfds, index = 0; | |
2146 | input_bfd != NULL; | |
2147 | input_bfd = input_bfd->link_next, index++) | |
2148 | { | |
2149 | /* We'll need the symbol table in a second. */ | |
2150 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2151 | if (symtab_hdr->sh_info == 0) | |
2152 | continue; | |
2153 | ||
2154 | /* We need an array of the local symbols attached to the input bfd. | |
2155 | Unfortunately, we're going to have to read & swap them in. */ | |
2156 | local_syms | |
2157 | = (Elf_Internal_Sym *) bfd_malloc (symtab_hdr->sh_info | |
2158 | * sizeof (Elf_Internal_Sym)); | |
2159 | if (local_syms == NULL) | |
2160 | { | |
2161 | for (i = 0; i < bfd_count; i++) | |
2162 | if (all_local_syms[i]) | |
2163 | free (all_local_syms[i]); | |
2164 | free (all_local_syms); | |
2165 | goto error_return; | |
2166 | } | |
2167 | all_local_syms[index] = local_syms; | |
2168 | ||
2169 | ext_syms | |
2170 | = (Elf32_External_Sym *) bfd_malloc (symtab_hdr->sh_info | |
2171 | * sizeof (Elf32_External_Sym)); | |
2172 | if (ext_syms == NULL) | |
2173 | { | |
2174 | for (i = 0; i < bfd_count; i++) | |
2175 | if (all_local_syms[i]) | |
2176 | free (all_local_syms[i]); | |
2177 | free (all_local_syms); | |
2178 | goto error_return; | |
2179 | } | |
2180 | ||
2181 | if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0 | |
2182 | || bfd_read (ext_syms, 1, | |
2183 | (symtab_hdr->sh_info | |
2184 | * sizeof (Elf32_External_Sym)), input_bfd) | |
2185 | != (symtab_hdr->sh_info * sizeof (Elf32_External_Sym))) | |
2186 | { | |
2187 | for (i = 0; i < bfd_count; i++) | |
2188 | if (all_local_syms[i]) | |
2189 | free (all_local_syms[i]); | |
2190 | free (all_local_syms); | |
2191 | free (ext_syms); | |
2192 | goto error_return; | |
2193 | } | |
2194 | ||
2195 | /* Swap the local symbols in. */ | |
2196 | isym = local_syms; | |
2197 | esym = ext_syms; | |
2198 | for (i = 0; i < symtab_hdr->sh_info; i++, esym++, isym++) | |
2199 | bfd_elf32_swap_symbol_in (input_bfd, esym, isym); | |
2200 | ||
2201 | /* Now we can free the external symbols. */ | |
2202 | free (ext_syms); | |
2203 | ||
2204 | if (elf32_hppa_read_symext_info (input_bfd, symtab_hdr, args_hash_table, | |
2205 | local_syms) == false) | |
2206 | { | |
2207 | for (i = 0; i < bfd_count; i++) | |
2208 | if (all_local_syms[i]) | |
2209 | free (all_local_syms[i]); | |
2210 | free (all_local_syms); | |
2211 | goto error_return; | |
2212 | } | |
2213 | } | |
2214 | ||
2215 | /* Magic as we know the stub bfd only has one section. */ | |
2216 | stub_sec = stub_bfd->sections; | |
2217 | ||
2218 | /* If generating a relocateable output file, then we don't | |
2219 | have to examine the relocs. */ | |
2220 | if (link_info->relocateable) | |
2221 | { | |
2222 | for (i = 0; i < bfd_count; i++) | |
2223 | if (all_local_syms[i]) | |
2224 | free (all_local_syms[i]); | |
2225 | free (all_local_syms); | |
2226 | return true; | |
2227 | } | |
2228 | ||
2229 | /* Now that we have argument location information for all the global | |
2230 | functions we can start looking for stubs. */ | |
2231 | for (input_bfd = link_info->input_bfds, index = 0; | |
2232 | input_bfd != NULL; | |
2233 | input_bfd = input_bfd->link_next, index++) | |
2234 | { | |
2235 | /* We'll need the symbol table in a second. */ | |
2236 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
2237 | if (symtab_hdr->sh_info == 0) | |
2238 | continue; | |
2239 | ||
2240 | local_syms = all_local_syms[index]; | |
2241 | ||
2242 | /* Walk over each section attached to the input bfd. */ | |
2243 | for (section = input_bfd->sections; | |
2244 | section != NULL; | |
2245 | section = section->next) | |
2246 | { | |
2247 | Elf_Internal_Shdr *input_rel_hdr; | |
2248 | Elf32_External_Rela *external_relocs, *erelaend, *erela; | |
2249 | Elf_Internal_Rela *internal_relocs, *irelaend, *irela; | |
2250 | ||
2251 | /* If there aren't any relocs, then there's nothing to do. */ | |
2252 | if ((section->flags & SEC_RELOC) == 0 | |
2253 | || section->reloc_count == 0) | |
2254 | continue; | |
2255 | ||
2256 | /* Allocate space for the external relocations. */ | |
2257 | external_relocs | |
2258 | = ((Elf32_External_Rela *) | |
2259 | bfd_malloc (section->reloc_count | |
2260 | * sizeof (Elf32_External_Rela))); | |
2261 | if (external_relocs == NULL) | |
2262 | { | |
2263 | for (i = 0; i < bfd_count; i++) | |
2264 | if (all_local_syms[i]) | |
2265 | free (all_local_syms[i]); | |
2266 | free (all_local_syms); | |
2267 | goto error_return; | |
2268 | } | |
2269 | ||
2270 | /* Likewise for the internal relocations. */ | |
2271 | internal_relocs | |
2272 | = ((Elf_Internal_Rela *) | |
2273 | bfd_malloc (section->reloc_count * sizeof (Elf_Internal_Rela))); | |
2274 | if (internal_relocs == NULL) | |
2275 | { | |
2276 | free (external_relocs); | |
2277 | for (i = 0; i < bfd_count; i++) | |
2278 | if (all_local_syms[i]) | |
2279 | free (all_local_syms[i]); | |
2280 | free (all_local_syms); | |
2281 | goto error_return; | |
2282 | } | |
2283 | ||
2284 | /* Read in the external relocs. */ | |
2285 | input_rel_hdr = &elf_section_data (section)->rel_hdr; | |
2286 | if (bfd_seek (input_bfd, input_rel_hdr->sh_offset, SEEK_SET) != 0 | |
2287 | || bfd_read (external_relocs, 1, input_rel_hdr->sh_size, | |
2288 | input_bfd) != input_rel_hdr->sh_size) | |
2289 | { | |
2290 | free (external_relocs); | |
2291 | free (internal_relocs); | |
2292 | for (i = 0; i < bfd_count; i++) | |
2293 | if (all_local_syms[i]) | |
2294 | free (all_local_syms[i]); | |
2295 | free (all_local_syms); | |
2296 | goto error_return; | |
2297 | } | |
2298 | ||
2299 | /* Swap in the relocs. */ | |
2300 | erela = external_relocs; | |
2301 | erelaend = erela + section->reloc_count; | |
2302 | irela = internal_relocs; | |
2303 | for (; erela < erelaend; erela++, irela++) | |
2304 | bfd_elf32_swap_reloca_in (input_bfd, erela, irela); | |
2305 | ||
2306 | /* We're done with the external relocs, free them. */ | |
2307 | free (external_relocs); | |
2308 | ||
2309 | /* Now examine each relocation. */ | |
2310 | irela = internal_relocs; | |
2311 | irelaend = irela + section->reloc_count; | |
2312 | for (; irela < irelaend; irela++) | |
2313 | { | |
2314 | long r_type, callee_args, caller_args, size_of_stub; | |
2315 | unsigned long r_index; | |
2316 | struct elf_link_hash_entry *hash; | |
2317 | struct elf32_hppa_stub_hash_entry *stub_hash; | |
2318 | struct elf32_hppa_args_hash_entry *args_hash; | |
2319 | Elf_Internal_Sym *sym; | |
2320 | asection *sym_sec; | |
2321 | const char *sym_name; | |
2322 | symvalue sym_value; | |
2323 | bfd_vma location, destination; | |
2324 | char *new_name = NULL; | |
2325 | ||
2326 | r_type = ELF32_R_TYPE (irela->r_info); | |
2327 | r_index = ELF32_R_SYM (irela->r_info); | |
2328 | ||
2329 | if (r_type < 0 || r_type >= (int) R_PARISC_UNIMPLEMENTED) | |
2330 | { | |
2331 | bfd_set_error (bfd_error_bad_value); | |
2332 | free (internal_relocs); | |
2333 | for (i = 0; i < bfd_count; i++) | |
2334 | if (all_local_syms[i]) | |
2335 | free (all_local_syms[i]); | |
2336 | free (all_local_syms); | |
2337 | goto error_return; | |
2338 | } | |
2339 | ||
2340 | /* Only look for stubs on call instructions or plabel | |
2341 | references. */ | |
2342 | if (r_type != R_PARISC_PCREL17F | |
2343 | && r_type != R_PARISC_PLABEL32 | |
2344 | && r_type != R_PARISC_PLABEL21L | |
2345 | && r_type != R_PARISC_PLABEL14R) | |
2346 | continue; | |
2347 | ||
2348 | /* Now determine the call target, its name, value, section | |
2349 | and argument relocation bits. */ | |
2350 | hash = NULL; | |
2351 | sym = NULL; | |
2352 | sym_sec = NULL; | |
2353 | if (r_index < symtab_hdr->sh_info) | |
2354 | { | |
2355 | /* It's a local symbol. */ | |
2356 | Elf_Internal_Shdr *hdr; | |
2357 | ||
2358 | sym = local_syms + r_index; | |
2359 | hdr = elf_elfsections (input_bfd)[sym->st_shndx]; | |
2360 | sym_sec = hdr->bfd_section; | |
2361 | sym_name = bfd_elf_string_from_elf_section (input_bfd, | |
2362 | symtab_hdr->sh_link, | |
2363 | sym->st_name); | |
2364 | sym_value = (ELF_ST_TYPE (sym->st_info) == STT_SECTION | |
2365 | ? 0 : sym->st_value); | |
2366 | destination = (sym_value | |
2367 | + sym_sec->output_offset | |
2368 | + sym_sec->output_section->vma); | |
2369 | ||
2370 | /* Tack on an ID so we can uniquely identify this local | |
2371 | symbol in the stub or arg info hash tables. */ | |
2372 | new_name = bfd_malloc (strlen (sym_name) + 10); | |
2373 | if (new_name == 0) | |
2374 | { | |
2375 | free (internal_relocs); | |
2376 | for (i = 0; i < bfd_count; i++) | |
2377 | if (all_local_syms[i]) | |
2378 | free (all_local_syms[i]); | |
2379 | free (all_local_syms); | |
2380 | goto error_return; | |
2381 | } | |
2382 | sprintf (new_name, "%s_%08x", sym_name, (int)sym_sec); | |
2383 | sym_name = new_name; | |
2384 | } | |
2385 | else | |
2386 | { | |
2387 | /* It's an external symbol. */ | |
2388 | long index; | |
2389 | ||
2390 | index = r_index - symtab_hdr->sh_info; | |
2391 | hash = elf_sym_hashes (input_bfd)[index]; | |
2392 | if (hash->root.type == bfd_link_hash_defined | |
2393 | || hash->root.type == bfd_link_hash_defweak) | |
2394 | { | |
2395 | sym_sec = hash->root.u.def.section; | |
2396 | sym_name = hash->root.root.string; | |
2397 | sym_value = hash->root.u.def.value; | |
2398 | destination = (sym_value | |
2399 | + sym_sec->output_offset | |
2400 | + sym_sec->output_section->vma); | |
2401 | } | |
2402 | else | |
2403 | { | |
2404 | bfd_set_error (bfd_error_bad_value); | |
2405 | free (internal_relocs); | |
2406 | for (i = 0; i < bfd_count; i++) | |
2407 | if (all_local_syms[i]) | |
2408 | free (all_local_syms[i]); | |
2409 | free (all_local_syms); | |
2410 | goto error_return; | |
2411 | } | |
2412 | } | |
2413 | ||
2414 | args_hash = elf32_hppa_args_hash_lookup (args_hash_table, | |
2415 | sym_name, false, false); | |
2416 | ||
2417 | /* Get both caller and callee argument information. */ | |
2418 | if (args_hash == NULL) | |
2419 | callee_args = 0; | |
2420 | else | |
2421 | callee_args = args_hash->arg_bits; | |
2422 | ||
2423 | /* For calls get the caller's bits from the addend of | |
2424 | the call relocation. For PLABELS the caller's bits | |
2425 | are assumed to have all args & return values in general | |
2426 | registers (0x155). */ | |
2427 | if (r_type == R_PARISC_PCREL17F) | |
2428 | caller_args = HPPA_R_ARG_RELOC (irela->r_addend); | |
2429 | else | |
2430 | caller_args = 0x155; | |
2431 | ||
2432 | /* Now determine where the call point is. */ | |
2433 | location = (section->output_offset | |
2434 | + section->output_section->vma | |
2435 | + irela->r_offset); | |
2436 | ||
2437 | /* We only care about the destination for PCREL function | |
2438 | calls (eg. we don't care for PLABELS). */ | |
2439 | if (r_type != R_PARISC_PCREL17F) | |
2440 | location = destination; | |
2441 | ||
2442 | /* Determine what (if any) linker stub is needed and its | |
2443 | size (in bytes). */ | |
2444 | size_of_stub = elf32_hppa_size_of_stub (callee_args, | |
2445 | caller_args, | |
2446 | location, | |
2447 | destination, | |
2448 | sym_name); | |
2449 | if (size_of_stub != 0) | |
2450 | { | |
2451 | char *stub_name; | |
2452 | unsigned int len; | |
2453 | ||
2454 | /* Get the name of this stub. */ | |
2455 | len = strlen (sym_name); | |
2456 | len += 23; | |
2457 | ||
2458 | stub_name = bfd_malloc (len); | |
2459 | if (!stub_name) | |
2460 | { | |
2461 | /* Because sym_name was mallocd above for local | |
2462 | symbols. */ | |
2463 | if (r_index < symtab_hdr->sh_info) | |
2464 | free (new_name); | |
2465 | ||
2466 | free (internal_relocs); | |
2467 | for (i = 0; i < bfd_count; i++) | |
2468 | if (all_local_syms[i]) | |
2469 | free (all_local_syms[i]); | |
2470 | free (all_local_syms); | |
2471 | goto error_return; | |
2472 | } | |
2473 | elf32_hppa_name_of_stub (caller_args, callee_args, | |
2474 | location, destination, stub_name); | |
2475 | strcat (stub_name + 22, sym_name); | |
2476 | ||
2477 | /* Because sym_name was malloced above for local symbols. */ | |
2478 | if (r_index < symtab_hdr->sh_info) | |
2479 | free (new_name); | |
2480 | ||
2481 | stub_hash | |
2482 | = elf32_hppa_stub_hash_lookup (stub_hash_table, stub_name, | |
2483 | false, false); | |
2484 | if (stub_hash != NULL) | |
2485 | { | |
2486 | /* The proper stub has already been created, nothing | |
2487 | else to do. */ | |
2488 | free (stub_name); | |
2489 | } | |
2490 | else | |
2491 | { | |
2492 | bfd_set_section_size (stub_bfd, stub_sec, | |
2493 | (bfd_section_size (stub_bfd, | |
2494 | stub_sec) | |
2495 | + size_of_stub)); | |
2496 | ||
2497 | /* Enter this entry into the linker stub hash table. */ | |
2498 | stub_hash | |
2499 | = elf32_hppa_stub_hash_lookup (stub_hash_table, | |
2500 | stub_name, true, true); | |
2501 | if (stub_hash == NULL) | |
2502 | { | |
2503 | free (stub_name); | |
2504 | free (internal_relocs); | |
2505 | for (i = 0; i < bfd_count; i++) | |
2506 | if (all_local_syms[i]) | |
2507 | free (all_local_syms[i]); | |
2508 | free (all_local_syms); | |
2509 | goto error_return; | |
2510 | } | |
2511 | ||
2512 | /* We'll need these to determine the address that the | |
2513 | stub will branch to. */ | |
2514 | stub_hash->target_value = sym_value; | |
2515 | stub_hash->target_section = sym_sec; | |
2516 | } | |
2517 | free (stub_name); | |
2518 | } | |
2519 | } | |
2520 | /* We're done with the internal relocs, free them. */ | |
2521 | free (internal_relocs); | |
2522 | } | |
2523 | } | |
2524 | /* We're done with the local symbols, free them. */ | |
2525 | for (i = 0; i < bfd_count; i++) | |
2526 | if (all_local_syms[i]) | |
2527 | free (all_local_syms[i]); | |
2528 | free (all_local_syms); | |
2529 | return true; | |
2530 | ||
2531 | error_return: | |
2532 | /* Return gracefully, avoiding dangling references to the hash tables. */ | |
2533 | if (stub_hash_table) | |
2534 | { | |
2535 | elf32_hppa_hash_table(link_info)->stub_hash_table = NULL; | |
2536 | free (stub_hash_table); | |
2537 | } | |
2538 | if (args_hash_table) | |
2539 | { | |
2540 | elf32_hppa_hash_table(link_info)->args_hash_table = NULL; | |
2541 | free (args_hash_table); | |
2542 | } | |
2543 | /* Set the size of the stub section to zero since we're never going | |
2544 | to create them. Avoids losing when we try to get its contents | |
2545 | too. */ | |
2546 | bfd_set_section_size (stub_bfd, stub_sec, 0); | |
2547 | return false; | |
2548 | } | |
2549 | ||
2550 | /* Misc BFD support code. */ | |
2551 | #define bfd_elf32_bfd_reloc_type_lookup elf_hppa_reloc_type_lookup | |
2552 | #define bfd_elf32_bfd_is_local_label_name hppa_elf_is_local_label_name | |
9e103c9c JL |
2553 | #define elf_info_to_howto elf_hppa_info_to_howto |
2554 | #define elf_info_to_howto_rel elf_hppa_info_to_howto_rel | |
252b5132 RH |
2555 | |
2556 | /* Symbol extension stuff. */ | |
2557 | #define bfd_elf32_set_section_contents elf32_hppa_set_section_contents | |
252b5132 RH |
2558 | #define elf_backend_symbol_table_processing \ |
2559 | elf32_hppa_backend_symbol_table_processing | |
2560 | #define elf_backend_begin_write_processing \ | |
2561 | elf32_hppa_backend_begin_write_processing | |
2562 | #define elf_backend_final_write_processing \ | |
2563 | elf32_hppa_backend_final_write_processing | |
2564 | ||
2565 | /* Stuff for the BFD linker. */ | |
2566 | #define elf_backend_relocate_section elf32_hppa_relocate_section | |
2567 | #define elf_backend_add_symbol_hook elf32_hppa_add_symbol_hook | |
2568 | #define elf_backend_link_output_symbol_hook \ | |
2569 | elf32_hppa_link_output_symbol_hook | |
2570 | #define bfd_elf32_bfd_link_hash_table_create \ | |
2571 | elf32_hppa_link_hash_table_create | |
2572 | ||
2573 | #define TARGET_BIG_SYM bfd_elf32_hppa_vec | |
2574 | #define TARGET_BIG_NAME "elf32-hppa" | |
2575 | #define ELF_ARCH bfd_arch_hppa | |
2576 | #define ELF_MACHINE_CODE EM_PARISC | |
2577 | #define ELF_MAXPAGESIZE 0x1000 | |
2578 | ||
2579 | #include "elf32-target.h" |