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[binutils.git] / bfd / elf64-alpha.c
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1 /* Alpha specific support for 64-bit ELF
2 Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
3 Free Software Foundation, Inc.
4 Contributed by Richard Henderson <rth@tamu.edu>.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
22 /* We need a published ABI spec for this. Until one comes out, don't
23 assume this'll remain unchanged forever. */
25 #include "bfd.h"
26 #include "sysdep.h"
27 #include "libbfd.h"
28 #include "elf-bfd.h"
30 #include "elf/alpha.h"
32 #define ALPHAECOFF
34 #define NO_COFF_RELOCS
35 #define NO_COFF_SYMBOLS
36 #define NO_COFF_LINENOS
38 /* Get the ECOFF swapping routines. Needed for the debug information. */
39 #include "coff/internal.h"
40 #include "coff/sym.h"
41 #include "coff/symconst.h"
42 #include "coff/ecoff.h"
43 #include "coff/alpha.h"
44 #include "aout/ar.h"
45 #include "libcoff.h"
46 #include "libecoff.h"
47 #define ECOFF_64
48 #include "ecoffswap.h"
51 /* Instruction data for plt generation and relaxation. */
53 #define OP_LDA 0x08
54 #define OP_LDAH 0x09
55 #define OP_LDQ 0x29
56 #define OP_BR 0x30
57 #define OP_BSR 0x34
59 #define INSN_LDA (OP_LDA << 26)
60 #define INSN_LDAH (OP_LDAH << 26)
61 #define INSN_LDQ (OP_LDQ << 26)
62 #define INSN_BR (OP_BR << 26)
64 #define INSN_ADDQ 0x40000400
65 #define INSN_RDUNIQ 0x0000009e
66 #define INSN_SUBQ 0x40000520
67 #define INSN_S4SUBQ 0x40000560
68 #define INSN_UNOP 0x2ffe0000
70 #define INSN_JSR 0x68004000
71 #define INSN_JMP 0x68000000
72 #define INSN_JSR_MASK 0xfc00c000
74 #define INSN_A(I,A) (I | (A << 21))
75 #define INSN_AB(I,A,B) (I | (A << 21) | (B << 16))
76 #define INSN_ABC(I,A,B,C) (I | (A << 21) | (B << 16) | C)
77 #define INSN_ABO(I,A,B,O) (I | (A << 21) | (B << 16) | ((O) & 0xffff))
78 #define INSN_AD(I,A,D) (I | (A << 21) | (((D) >> 2) & 0x1fffff))
80 /* PLT/GOT Stuff */
82 /* Set by ld emulation. Putting this into the link_info or hash structure
83 is simply working too hard. */
84 #ifdef USE_SECUREPLT
85 bfd_boolean elf64_alpha_use_secureplt = TRUE;
86 #else
87 bfd_boolean elf64_alpha_use_secureplt = FALSE;
88 #endif
90 #define OLD_PLT_HEADER_SIZE 32
91 #define OLD_PLT_ENTRY_SIZE 12
92 #define NEW_PLT_HEADER_SIZE 36
93 #define NEW_PLT_ENTRY_SIZE 4
95 #define PLT_HEADER_SIZE \
96 (elf64_alpha_use_secureplt ? NEW_PLT_HEADER_SIZE : OLD_PLT_HEADER_SIZE)
97 #define PLT_ENTRY_SIZE \
98 (elf64_alpha_use_secureplt ? NEW_PLT_ENTRY_SIZE : OLD_PLT_ENTRY_SIZE)
100 #define MAX_GOT_SIZE (64*1024)
102 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so"
104 struct alpha_elf_link_hash_entry
106 struct elf_link_hash_entry root;
108 /* External symbol information. */
109 EXTR esym;
111 /* Cumulative flags for all the .got entries. */
112 int flags;
114 /* Contexts in which a literal was referenced. */
115 #define ALPHA_ELF_LINK_HASH_LU_ADDR 0x01
116 #define ALPHA_ELF_LINK_HASH_LU_MEM 0x02
117 #define ALPHA_ELF_LINK_HASH_LU_BYTE 0x04
118 #define ALPHA_ELF_LINK_HASH_LU_JSR 0x08
119 #define ALPHA_ELF_LINK_HASH_LU_TLSGD 0x10
120 #define ALPHA_ELF_LINK_HASH_LU_TLSLDM 0x20
121 #define ALPHA_ELF_LINK_HASH_LU_JSRDIRECT 0x40
122 #define ALPHA_ELF_LINK_HASH_LU_PLT 0x38
123 #define ALPHA_ELF_LINK_HASH_TLS_IE 0x80
125 /* Used to implement multiple .got subsections. */
126 struct alpha_elf_got_entry
128 struct alpha_elf_got_entry *next;
130 /* Which .got subsection? */
131 bfd *gotobj;
133 /* The addend in effect for this entry. */
134 bfd_vma addend;
136 /* The .got offset for this entry. */
137 int got_offset;
139 /* The .plt offset for this entry. */
140 int plt_offset;
142 /* How many references to this entry? */
143 int use_count;
145 /* The relocation type of this entry. */
146 unsigned char reloc_type;
148 /* How a LITERAL is used. */
149 unsigned char flags;
151 /* Have we initialized the dynamic relocation for this entry? */
152 unsigned char reloc_done;
154 /* Have we adjusted this entry for SEC_MERGE? */
155 unsigned char reloc_xlated;
156 } *got_entries;
158 /* Used to count non-got, non-plt relocations for delayed sizing
159 of relocation sections. */
160 struct alpha_elf_reloc_entry
162 struct alpha_elf_reloc_entry *next;
164 /* Which .reloc section? */
165 asection *srel;
167 /* What kind of relocation? */
168 unsigned int rtype;
170 /* Is this against read-only section? */
171 unsigned int reltext : 1;
173 /* How many did we find? */
174 unsigned long count;
175 } *reloc_entries;
178 /* Alpha ELF linker hash table. */
180 struct alpha_elf_link_hash_table
182 struct elf_link_hash_table root;
184 /* The head of a list of .got subsections linked through
185 alpha_elf_tdata(abfd)->got_link_next. */
186 bfd *got_list;
189 /* Look up an entry in a Alpha ELF linker hash table. */
191 #define alpha_elf_link_hash_lookup(table, string, create, copy, follow) \
192 ((struct alpha_elf_link_hash_entry *) \
193 elf_link_hash_lookup (&(table)->root, (string), (create), \
194 (copy), (follow)))
196 /* Traverse a Alpha ELF linker hash table. */
198 #define alpha_elf_link_hash_traverse(table, func, info) \
199 (elf_link_hash_traverse \
200 (&(table)->root, \
201 (bfd_boolean (*) (struct elf_link_hash_entry *, PTR)) (func), \
202 (info)))
204 /* Get the Alpha ELF linker hash table from a link_info structure. */
206 #define alpha_elf_hash_table(p) \
207 ((struct alpha_elf_link_hash_table *) ((p)->hash))
209 /* Get the object's symbols as our own entry type. */
211 #define alpha_elf_sym_hashes(abfd) \
212 ((struct alpha_elf_link_hash_entry **)elf_sym_hashes(abfd))
214 /* Should we do dynamic things to this symbol? This differs from the
215 generic version in that we never need to consider function pointer
216 equality wrt PLT entries -- we don't create a PLT entry if a symbol's
217 address is ever taken. */
219 static inline bfd_boolean
220 alpha_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
221 struct bfd_link_info *info)
223 return _bfd_elf_dynamic_symbol_p (h, info, 0);
226 /* Create an entry in a Alpha ELF linker hash table. */
228 static struct bfd_hash_entry *
229 elf64_alpha_link_hash_newfunc (struct bfd_hash_entry *entry,
230 struct bfd_hash_table *table,
231 const char *string)
233 struct alpha_elf_link_hash_entry *ret =
234 (struct alpha_elf_link_hash_entry *) entry;
236 /* Allocate the structure if it has not already been allocated by a
237 subclass. */
238 if (ret == (struct alpha_elf_link_hash_entry *) NULL)
239 ret = ((struct alpha_elf_link_hash_entry *)
240 bfd_hash_allocate (table,
241 sizeof (struct alpha_elf_link_hash_entry)));
242 if (ret == (struct alpha_elf_link_hash_entry *) NULL)
243 return (struct bfd_hash_entry *) ret;
245 /* Call the allocation method of the superclass. */
246 ret = ((struct alpha_elf_link_hash_entry *)
247 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
248 table, string));
249 if (ret != (struct alpha_elf_link_hash_entry *) NULL)
251 /* Set local fields. */
252 memset (&ret->esym, 0, sizeof (EXTR));
253 /* We use -2 as a marker to indicate that the information has
254 not been set. -1 means there is no associated ifd. */
255 ret->esym.ifd = -2;
256 ret->flags = 0;
257 ret->got_entries = NULL;
258 ret->reloc_entries = NULL;
261 return (struct bfd_hash_entry *) ret;
264 /* Create a Alpha ELF linker hash table. */
266 static struct bfd_link_hash_table *
267 elf64_alpha_bfd_link_hash_table_create (bfd *abfd)
269 struct alpha_elf_link_hash_table *ret;
270 bfd_size_type amt = sizeof (struct alpha_elf_link_hash_table);
272 ret = (struct alpha_elf_link_hash_table *) bfd_zmalloc (amt);
273 if (ret == (struct alpha_elf_link_hash_table *) NULL)
274 return NULL;
276 if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
277 elf64_alpha_link_hash_newfunc))
279 free (ret);
280 return NULL;
283 return &ret->root.root;
286 /* We have some private fields hanging off of the elf_tdata structure. */
288 struct alpha_elf_obj_tdata
290 struct elf_obj_tdata root;
292 /* For every input file, these are the got entries for that object's
293 local symbols. */
294 struct alpha_elf_got_entry ** local_got_entries;
296 /* For every input file, this is the object that owns the got that
297 this input file uses. */
298 bfd *gotobj;
300 /* For every got, this is a linked list through the objects using this got */
301 bfd *in_got_link_next;
303 /* For every got, this is a link to the next got subsegment. */
304 bfd *got_link_next;
306 /* For every got, this is the section. */
307 asection *got;
309 /* For every got, this is it's total number of words. */
310 int total_got_size;
312 /* For every got, this is the sum of the number of words required
313 to hold all of the member object's local got. */
314 int local_got_size;
317 #define alpha_elf_tdata(abfd) \
318 ((struct alpha_elf_obj_tdata *) (abfd)->tdata.any)
320 static bfd_boolean
321 elf64_alpha_mkobject (bfd *abfd)
323 bfd_size_type amt = sizeof (struct alpha_elf_obj_tdata);
324 abfd->tdata.any = bfd_zalloc (abfd, amt);
325 if (abfd->tdata.any == NULL)
326 return FALSE;
327 return TRUE;
330 static bfd_boolean
331 elf64_alpha_object_p (bfd *abfd)
333 /* Set the right machine number for an Alpha ELF file. */
334 return bfd_default_set_arch_mach (abfd, bfd_arch_alpha, 0);
337 /* A relocation function which doesn't do anything. */
339 static bfd_reloc_status_type
340 elf64_alpha_reloc_nil (bfd *abfd ATTRIBUTE_UNUSED, arelent *reloc,
341 asymbol *sym ATTRIBUTE_UNUSED,
342 PTR data ATTRIBUTE_UNUSED, asection *sec,
343 bfd *output_bfd, char **error_message ATTRIBUTE_UNUSED)
345 if (output_bfd)
346 reloc->address += sec->output_offset;
347 return bfd_reloc_ok;
350 /* A relocation function used for an unsupported reloc. */
352 static bfd_reloc_status_type
353 elf64_alpha_reloc_bad (bfd *abfd ATTRIBUTE_UNUSED, arelent *reloc,
354 asymbol *sym ATTRIBUTE_UNUSED,
355 PTR data ATTRIBUTE_UNUSED, asection *sec,
356 bfd *output_bfd, char **error_message ATTRIBUTE_UNUSED)
358 if (output_bfd)
359 reloc->address += sec->output_offset;
360 return bfd_reloc_notsupported;
363 /* Do the work of the GPDISP relocation. */
365 static bfd_reloc_status_type
366 elf64_alpha_do_reloc_gpdisp (bfd *abfd, bfd_vma gpdisp, bfd_byte *p_ldah,
367 bfd_byte *p_lda)
369 bfd_reloc_status_type ret = bfd_reloc_ok;
370 bfd_vma addend;
371 unsigned long i_ldah, i_lda;
373 i_ldah = bfd_get_32 (abfd, p_ldah);
374 i_lda = bfd_get_32 (abfd, p_lda);
376 /* Complain if the instructions are not correct. */
377 if (((i_ldah >> 26) & 0x3f) != 0x09
378 || ((i_lda >> 26) & 0x3f) != 0x08)
379 ret = bfd_reloc_dangerous;
381 /* Extract the user-supplied offset, mirroring the sign extensions
382 that the instructions perform. */
383 addend = ((i_ldah & 0xffff) << 16) | (i_lda & 0xffff);
384 addend = (addend ^ 0x80008000) - 0x80008000;
386 gpdisp += addend;
388 if ((bfd_signed_vma) gpdisp < -(bfd_signed_vma) 0x80000000
389 || (bfd_signed_vma) gpdisp >= (bfd_signed_vma) 0x7fff8000)
390 ret = bfd_reloc_overflow;
392 /* compensate for the sign extension again. */
393 i_ldah = ((i_ldah & 0xffff0000)
394 | (((gpdisp >> 16) + ((gpdisp >> 15) & 1)) & 0xffff));
395 i_lda = (i_lda & 0xffff0000) | (gpdisp & 0xffff);
397 bfd_put_32 (abfd, (bfd_vma) i_ldah, p_ldah);
398 bfd_put_32 (abfd, (bfd_vma) i_lda, p_lda);
400 return ret;
403 /* The special function for the GPDISP reloc. */
405 static bfd_reloc_status_type
406 elf64_alpha_reloc_gpdisp (bfd *abfd, arelent *reloc_entry,
407 asymbol *sym ATTRIBUTE_UNUSED, PTR data,
408 asection *input_section, bfd *output_bfd,
409 char **err_msg)
411 bfd_reloc_status_type ret;
412 bfd_vma gp, relocation;
413 bfd_vma high_address;
414 bfd_byte *p_ldah, *p_lda;
416 /* Don't do anything if we're not doing a final link. */
417 if (output_bfd)
419 reloc_entry->address += input_section->output_offset;
420 return bfd_reloc_ok;
423 high_address = bfd_get_section_limit (abfd, input_section);
424 if (reloc_entry->address > high_address
425 || reloc_entry->address + reloc_entry->addend > high_address)
426 return bfd_reloc_outofrange;
428 /* The gp used in the portion of the output object to which this
429 input object belongs is cached on the input bfd. */
430 gp = _bfd_get_gp_value (abfd);
432 relocation = (input_section->output_section->vma
433 + input_section->output_offset
434 + reloc_entry->address);
436 p_ldah = (bfd_byte *) data + reloc_entry->address;
437 p_lda = p_ldah + reloc_entry->addend;
439 ret = elf64_alpha_do_reloc_gpdisp (abfd, gp - relocation, p_ldah, p_lda);
441 /* Complain if the instructions are not correct. */
442 if (ret == bfd_reloc_dangerous)
443 *err_msg = _("GPDISP relocation did not find ldah and lda instructions");
445 return ret;
448 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
449 from smaller values. Start with zero, widen, *then* decrement. */
450 #define MINUS_ONE (((bfd_vma)0) - 1)
452 #define SKIP_HOWTO(N) \
453 HOWTO(N, 0, 0, 0, 0, 0, 0, elf64_alpha_reloc_bad, 0, 0, 0, 0, 0)
455 static reloc_howto_type elf64_alpha_howto_table[] =
457 HOWTO (R_ALPHA_NONE, /* type */
458 0, /* rightshift */
459 0, /* size (0 = byte, 1 = short, 2 = long) */
460 8, /* bitsize */
461 TRUE, /* pc_relative */
462 0, /* bitpos */
463 complain_overflow_dont, /* complain_on_overflow */
464 elf64_alpha_reloc_nil, /* special_function */
465 "NONE", /* name */
466 FALSE, /* partial_inplace */
467 0, /* src_mask */
468 0, /* dst_mask */
469 TRUE), /* pcrel_offset */
471 /* A 32 bit reference to a symbol. */
472 HOWTO (R_ALPHA_REFLONG, /* type */
473 0, /* rightshift */
474 2, /* size (0 = byte, 1 = short, 2 = long) */
475 32, /* bitsize */
476 FALSE, /* pc_relative */
477 0, /* bitpos */
478 complain_overflow_bitfield, /* complain_on_overflow */
479 0, /* special_function */
480 "REFLONG", /* name */
481 FALSE, /* partial_inplace */
482 0xffffffff, /* src_mask */
483 0xffffffff, /* dst_mask */
484 FALSE), /* pcrel_offset */
486 /* A 64 bit reference to a symbol. */
487 HOWTO (R_ALPHA_REFQUAD, /* type */
488 0, /* rightshift */
489 4, /* size (0 = byte, 1 = short, 2 = long) */
490 64, /* bitsize */
491 FALSE, /* pc_relative */
492 0, /* bitpos */
493 complain_overflow_bitfield, /* complain_on_overflow */
494 0, /* special_function */
495 "REFQUAD", /* name */
496 FALSE, /* partial_inplace */
497 MINUS_ONE, /* src_mask */
498 MINUS_ONE, /* dst_mask */
499 FALSE), /* pcrel_offset */
501 /* A 32 bit GP relative offset. This is just like REFLONG except
502 that when the value is used the value of the gp register will be
503 added in. */
504 HOWTO (R_ALPHA_GPREL32, /* type */
505 0, /* rightshift */
506 2, /* size (0 = byte, 1 = short, 2 = long) */
507 32, /* bitsize */
508 FALSE, /* pc_relative */
509 0, /* bitpos */
510 complain_overflow_bitfield, /* complain_on_overflow */
511 0, /* special_function */
512 "GPREL32", /* name */
513 FALSE, /* partial_inplace */
514 0xffffffff, /* src_mask */
515 0xffffffff, /* dst_mask */
516 FALSE), /* pcrel_offset */
518 /* Used for an instruction that refers to memory off the GP register. */
519 HOWTO (R_ALPHA_LITERAL, /* type */
520 0, /* rightshift */
521 1, /* size (0 = byte, 1 = short, 2 = long) */
522 16, /* bitsize */
523 FALSE, /* pc_relative */
524 0, /* bitpos */
525 complain_overflow_signed, /* complain_on_overflow */
526 0, /* special_function */
527 "ELF_LITERAL", /* name */
528 FALSE, /* partial_inplace */
529 0xffff, /* src_mask */
530 0xffff, /* dst_mask */
531 FALSE), /* pcrel_offset */
533 /* This reloc only appears immediately following an ELF_LITERAL reloc.
534 It identifies a use of the literal. The symbol index is special:
535 1 means the literal address is in the base register of a memory
536 format instruction; 2 means the literal address is in the byte
537 offset register of a byte-manipulation instruction; 3 means the
538 literal address is in the target register of a jsr instruction.
539 This does not actually do any relocation. */
540 HOWTO (R_ALPHA_LITUSE, /* type */
541 0, /* rightshift */
542 1, /* size (0 = byte, 1 = short, 2 = long) */
543 32, /* bitsize */
544 FALSE, /* pc_relative */
545 0, /* bitpos */
546 complain_overflow_dont, /* complain_on_overflow */
547 elf64_alpha_reloc_nil, /* special_function */
548 "LITUSE", /* name */
549 FALSE, /* partial_inplace */
550 0, /* src_mask */
551 0, /* dst_mask */
552 FALSE), /* pcrel_offset */
554 /* Load the gp register. This is always used for a ldah instruction
555 which loads the upper 16 bits of the gp register. The symbol
556 index of the GPDISP instruction is an offset in bytes to the lda
557 instruction that loads the lower 16 bits. The value to use for
558 the relocation is the difference between the GP value and the
559 current location; the load will always be done against a register
560 holding the current address.
562 NOTE: Unlike ECOFF, partial in-place relocation is not done. If
563 any offset is present in the instructions, it is an offset from
564 the register to the ldah instruction. This lets us avoid any
565 stupid hackery like inventing a gp value to do partial relocation
566 against. Also unlike ECOFF, we do the whole relocation off of
567 the GPDISP rather than a GPDISP_HI16/GPDISP_LO16 pair. An odd,
568 space consuming bit, that, since all the information was present
569 in the GPDISP_HI16 reloc. */
570 HOWTO (R_ALPHA_GPDISP, /* type */
571 16, /* rightshift */
572 2, /* size (0 = byte, 1 = short, 2 = long) */
573 16, /* bitsize */
574 FALSE, /* pc_relative */
575 0, /* bitpos */
576 complain_overflow_dont, /* complain_on_overflow */
577 elf64_alpha_reloc_gpdisp, /* special_function */
578 "GPDISP", /* name */
579 FALSE, /* partial_inplace */
580 0xffff, /* src_mask */
581 0xffff, /* dst_mask */
582 TRUE), /* pcrel_offset */
584 /* A 21 bit branch. */
585 HOWTO (R_ALPHA_BRADDR, /* type */
586 2, /* rightshift */
587 2, /* size (0 = byte, 1 = short, 2 = long) */
588 21, /* bitsize */
589 TRUE, /* pc_relative */
590 0, /* bitpos */
591 complain_overflow_signed, /* complain_on_overflow */
592 0, /* special_function */
593 "BRADDR", /* name */
594 FALSE, /* partial_inplace */
595 0x1fffff, /* src_mask */
596 0x1fffff, /* dst_mask */
597 TRUE), /* pcrel_offset */
599 /* A hint for a jump to a register. */
600 HOWTO (R_ALPHA_HINT, /* type */
601 2, /* rightshift */
602 1, /* size (0 = byte, 1 = short, 2 = long) */
603 14, /* bitsize */
604 TRUE, /* pc_relative */
605 0, /* bitpos */
606 complain_overflow_dont, /* complain_on_overflow */
607 0, /* special_function */
608 "HINT", /* name */
609 FALSE, /* partial_inplace */
610 0x3fff, /* src_mask */
611 0x3fff, /* dst_mask */
612 TRUE), /* pcrel_offset */
614 /* 16 bit PC relative offset. */
615 HOWTO (R_ALPHA_SREL16, /* type */
616 0, /* rightshift */
617 1, /* size (0 = byte, 1 = short, 2 = long) */
618 16, /* bitsize */
619 TRUE, /* pc_relative */
620 0, /* bitpos */
621 complain_overflow_signed, /* complain_on_overflow */
622 0, /* special_function */
623 "SREL16", /* name */
624 FALSE, /* partial_inplace */
625 0xffff, /* src_mask */
626 0xffff, /* dst_mask */
627 TRUE), /* pcrel_offset */
629 /* 32 bit PC relative offset. */
630 HOWTO (R_ALPHA_SREL32, /* type */
631 0, /* rightshift */
632 2, /* size (0 = byte, 1 = short, 2 = long) */
633 32, /* bitsize */
634 TRUE, /* pc_relative */
635 0, /* bitpos */
636 complain_overflow_signed, /* complain_on_overflow */
637 0, /* special_function */
638 "SREL32", /* name */
639 FALSE, /* partial_inplace */
640 0xffffffff, /* src_mask */
641 0xffffffff, /* dst_mask */
642 TRUE), /* pcrel_offset */
644 /* A 64 bit PC relative offset. */
645 HOWTO (R_ALPHA_SREL64, /* type */
646 0, /* rightshift */
647 4, /* size (0 = byte, 1 = short, 2 = long) */
648 64, /* bitsize */
649 TRUE, /* pc_relative */
650 0, /* bitpos */
651 complain_overflow_signed, /* complain_on_overflow */
652 0, /* special_function */
653 "SREL64", /* name */
654 FALSE, /* partial_inplace */
655 MINUS_ONE, /* src_mask */
656 MINUS_ONE, /* dst_mask */
657 TRUE), /* pcrel_offset */
659 /* Skip 12 - 16; deprecated ECOFF relocs. */
660 SKIP_HOWTO (12),
661 SKIP_HOWTO (13),
662 SKIP_HOWTO (14),
663 SKIP_HOWTO (15),
664 SKIP_HOWTO (16),
666 /* The high 16 bits of the displacement from GP to the target. */
667 HOWTO (R_ALPHA_GPRELHIGH,
668 0, /* rightshift */
669 1, /* size (0 = byte, 1 = short, 2 = long) */
670 16, /* bitsize */
671 FALSE, /* pc_relative */
672 0, /* bitpos */
673 complain_overflow_signed, /* complain_on_overflow */
674 0, /* special_function */
675 "GPRELHIGH", /* name */
676 FALSE, /* partial_inplace */
677 0xffff, /* src_mask */
678 0xffff, /* dst_mask */
679 FALSE), /* pcrel_offset */
681 /* The low 16 bits of the displacement from GP to the target. */
682 HOWTO (R_ALPHA_GPRELLOW,
683 0, /* rightshift */
684 1, /* size (0 = byte, 1 = short, 2 = long) */
685 16, /* bitsize */
686 FALSE, /* pc_relative */
687 0, /* bitpos */
688 complain_overflow_dont, /* complain_on_overflow */
689 0, /* special_function */
690 "GPRELLOW", /* name */
691 FALSE, /* partial_inplace */
692 0xffff, /* src_mask */
693 0xffff, /* dst_mask */
694 FALSE), /* pcrel_offset */
696 /* A 16-bit displacement from the GP to the target. */
697 HOWTO (R_ALPHA_GPREL16,
698 0, /* rightshift */
699 1, /* size (0 = byte, 1 = short, 2 = long) */
700 16, /* bitsize */
701 FALSE, /* pc_relative */
702 0, /* bitpos */
703 complain_overflow_signed, /* complain_on_overflow */
704 0, /* special_function */
705 "GPREL16", /* name */
706 FALSE, /* partial_inplace */
707 0xffff, /* src_mask */
708 0xffff, /* dst_mask */
709 FALSE), /* pcrel_offset */
711 /* Skip 20 - 23; deprecated ECOFF relocs. */
712 SKIP_HOWTO (20),
713 SKIP_HOWTO (21),
714 SKIP_HOWTO (22),
715 SKIP_HOWTO (23),
717 /* Misc ELF relocations. */
719 /* A dynamic relocation to copy the target into our .dynbss section. */
720 /* Not generated, as all Alpha objects use PIC, so it is not needed. It
721 is present because every other ELF has one, but should not be used
722 because .dynbss is an ugly thing. */
723 HOWTO (R_ALPHA_COPY,
727 FALSE,
729 complain_overflow_dont,
730 bfd_elf_generic_reloc,
731 "COPY",
732 FALSE,
735 TRUE),
737 /* A dynamic relocation for a .got entry. */
738 HOWTO (R_ALPHA_GLOB_DAT,
742 FALSE,
744 complain_overflow_dont,
745 bfd_elf_generic_reloc,
746 "GLOB_DAT",
747 FALSE,
750 TRUE),
752 /* A dynamic relocation for a .plt entry. */
753 HOWTO (R_ALPHA_JMP_SLOT,
757 FALSE,
759 complain_overflow_dont,
760 bfd_elf_generic_reloc,
761 "JMP_SLOT",
762 FALSE,
765 TRUE),
767 /* A dynamic relocation to add the base of the DSO to a 64-bit field. */
768 HOWTO (R_ALPHA_RELATIVE,
772 FALSE,
774 complain_overflow_dont,
775 bfd_elf_generic_reloc,
776 "RELATIVE",
777 FALSE,
780 TRUE),
782 /* A 21 bit branch that adjusts for gp loads. */
783 HOWTO (R_ALPHA_BRSGP, /* type */
784 2, /* rightshift */
785 2, /* size (0 = byte, 1 = short, 2 = long) */
786 21, /* bitsize */
787 TRUE, /* pc_relative */
788 0, /* bitpos */
789 complain_overflow_signed, /* complain_on_overflow */
790 0, /* special_function */
791 "BRSGP", /* name */
792 FALSE, /* partial_inplace */
793 0x1fffff, /* src_mask */
794 0x1fffff, /* dst_mask */
795 TRUE), /* pcrel_offset */
797 /* Creates a tls_index for the symbol in the got. */
798 HOWTO (R_ALPHA_TLSGD, /* type */
799 0, /* rightshift */
800 1, /* size (0 = byte, 1 = short, 2 = long) */
801 16, /* bitsize */
802 FALSE, /* pc_relative */
803 0, /* bitpos */
804 complain_overflow_signed, /* complain_on_overflow */
805 0, /* special_function */
806 "TLSGD", /* name */
807 FALSE, /* partial_inplace */
808 0xffff, /* src_mask */
809 0xffff, /* dst_mask */
810 FALSE), /* pcrel_offset */
812 /* Creates a tls_index for the (current) module in the got. */
813 HOWTO (R_ALPHA_TLSLDM, /* type */
814 0, /* rightshift */
815 1, /* size (0 = byte, 1 = short, 2 = long) */
816 16, /* bitsize */
817 FALSE, /* pc_relative */
818 0, /* bitpos */
819 complain_overflow_signed, /* complain_on_overflow */
820 0, /* special_function */
821 "TLSLDM", /* name */
822 FALSE, /* partial_inplace */
823 0xffff, /* src_mask */
824 0xffff, /* dst_mask */
825 FALSE), /* pcrel_offset */
827 /* A dynamic relocation for a DTP module entry. */
828 HOWTO (R_ALPHA_DTPMOD64, /* type */
829 0, /* rightshift */
830 4, /* size (0 = byte, 1 = short, 2 = long) */
831 64, /* bitsize */
832 FALSE, /* pc_relative */
833 0, /* bitpos */
834 complain_overflow_bitfield, /* complain_on_overflow */
835 0, /* special_function */
836 "DTPMOD64", /* name */
837 FALSE, /* partial_inplace */
838 MINUS_ONE, /* src_mask */
839 MINUS_ONE, /* dst_mask */
840 FALSE), /* pcrel_offset */
842 /* Creates a 64-bit offset in the got for the displacement
843 from DTP to the target. */
844 HOWTO (R_ALPHA_GOTDTPREL, /* type */
845 0, /* rightshift */
846 1, /* size (0 = byte, 1 = short, 2 = long) */
847 16, /* bitsize */
848 FALSE, /* pc_relative */
849 0, /* bitpos */
850 complain_overflow_signed, /* complain_on_overflow */
851 0, /* special_function */
852 "GOTDTPREL", /* name */
853 FALSE, /* partial_inplace */
854 0xffff, /* src_mask */
855 0xffff, /* dst_mask */
856 FALSE), /* pcrel_offset */
858 /* A dynamic relocation for a displacement from DTP to the target. */
859 HOWTO (R_ALPHA_DTPREL64, /* type */
860 0, /* rightshift */
861 4, /* size (0 = byte, 1 = short, 2 = long) */
862 64, /* bitsize */
863 FALSE, /* pc_relative */
864 0, /* bitpos */
865 complain_overflow_bitfield, /* complain_on_overflow */
866 0, /* special_function */
867 "DTPREL64", /* name */
868 FALSE, /* partial_inplace */
869 MINUS_ONE, /* src_mask */
870 MINUS_ONE, /* dst_mask */
871 FALSE), /* pcrel_offset */
873 /* The high 16 bits of the displacement from DTP to the target. */
874 HOWTO (R_ALPHA_DTPRELHI, /* type */
875 0, /* rightshift */
876 1, /* size (0 = byte, 1 = short, 2 = long) */
877 16, /* bitsize */
878 FALSE, /* pc_relative */
879 0, /* bitpos */
880 complain_overflow_signed, /* complain_on_overflow */
881 0, /* special_function */
882 "DTPRELHI", /* name */
883 FALSE, /* partial_inplace */
884 0xffff, /* src_mask */
885 0xffff, /* dst_mask */
886 FALSE), /* pcrel_offset */
888 /* The low 16 bits of the displacement from DTP to the target. */
889 HOWTO (R_ALPHA_DTPRELLO, /* type */
890 0, /* rightshift */
891 1, /* size (0 = byte, 1 = short, 2 = long) */
892 16, /* bitsize */
893 FALSE, /* pc_relative */
894 0, /* bitpos */
895 complain_overflow_dont, /* complain_on_overflow */
896 0, /* special_function */
897 "DTPRELLO", /* name */
898 FALSE, /* partial_inplace */
899 0xffff, /* src_mask */
900 0xffff, /* dst_mask */
901 FALSE), /* pcrel_offset */
903 /* A 16-bit displacement from DTP to the target. */
904 HOWTO (R_ALPHA_DTPREL16, /* type */
905 0, /* rightshift */
906 1, /* size (0 = byte, 1 = short, 2 = long) */
907 16, /* bitsize */
908 FALSE, /* pc_relative */
909 0, /* bitpos */
910 complain_overflow_signed, /* complain_on_overflow */
911 0, /* special_function */
912 "DTPREL16", /* name */
913 FALSE, /* partial_inplace */
914 0xffff, /* src_mask */
915 0xffff, /* dst_mask */
916 FALSE), /* pcrel_offset */
918 /* Creates a 64-bit offset in the got for the displacement
919 from TP to the target. */
920 HOWTO (R_ALPHA_GOTTPREL, /* type */
921 0, /* rightshift */
922 1, /* size (0 = byte, 1 = short, 2 = long) */
923 16, /* bitsize */
924 FALSE, /* pc_relative */
925 0, /* bitpos */
926 complain_overflow_signed, /* complain_on_overflow */
927 0, /* special_function */
928 "GOTTPREL", /* name */
929 FALSE, /* partial_inplace */
930 0xffff, /* src_mask */
931 0xffff, /* dst_mask */
932 FALSE), /* pcrel_offset */
934 /* A dynamic relocation for a displacement from TP to the target. */
935 HOWTO (R_ALPHA_TPREL64, /* type */
936 0, /* rightshift */
937 4, /* size (0 = byte, 1 = short, 2 = long) */
938 64, /* bitsize */
939 FALSE, /* pc_relative */
940 0, /* bitpos */
941 complain_overflow_bitfield, /* complain_on_overflow */
942 0, /* special_function */
943 "TPREL64", /* name */
944 FALSE, /* partial_inplace */
945 MINUS_ONE, /* src_mask */
946 MINUS_ONE, /* dst_mask */
947 FALSE), /* pcrel_offset */
949 /* The high 16 bits of the displacement from TP to the target. */
950 HOWTO (R_ALPHA_TPRELHI, /* type */
951 0, /* rightshift */
952 1, /* size (0 = byte, 1 = short, 2 = long) */
953 16, /* bitsize */
954 FALSE, /* pc_relative */
955 0, /* bitpos */
956 complain_overflow_signed, /* complain_on_overflow */
957 0, /* special_function */
958 "TPRELHI", /* name */
959 FALSE, /* partial_inplace */
960 0xffff, /* src_mask */
961 0xffff, /* dst_mask */
962 FALSE), /* pcrel_offset */
964 /* The low 16 bits of the displacement from TP to the target. */
965 HOWTO (R_ALPHA_TPRELLO, /* type */
966 0, /* rightshift */
967 1, /* size (0 = byte, 1 = short, 2 = long) */
968 16, /* bitsize */
969 FALSE, /* pc_relative */
970 0, /* bitpos */
971 complain_overflow_dont, /* complain_on_overflow */
972 0, /* special_function */
973 "TPRELLO", /* name */
974 FALSE, /* partial_inplace */
975 0xffff, /* src_mask */
976 0xffff, /* dst_mask */
977 FALSE), /* pcrel_offset */
979 /* A 16-bit displacement from TP to the target. */
980 HOWTO (R_ALPHA_TPREL16, /* type */
981 0, /* rightshift */
982 1, /* size (0 = byte, 1 = short, 2 = long) */
983 16, /* bitsize */
984 FALSE, /* pc_relative */
985 0, /* bitpos */
986 complain_overflow_signed, /* complain_on_overflow */
987 0, /* special_function */
988 "TPREL16", /* name */
989 FALSE, /* partial_inplace */
990 0xffff, /* src_mask */
991 0xffff, /* dst_mask */
992 FALSE), /* pcrel_offset */
995 /* A mapping from BFD reloc types to Alpha ELF reloc types. */
997 struct elf_reloc_map
999 bfd_reloc_code_real_type bfd_reloc_val;
1000 int elf_reloc_val;
1003 static const struct elf_reloc_map elf64_alpha_reloc_map[] =
1005 {BFD_RELOC_NONE, R_ALPHA_NONE},
1006 {BFD_RELOC_32, R_ALPHA_REFLONG},
1007 {BFD_RELOC_64, R_ALPHA_REFQUAD},
1008 {BFD_RELOC_CTOR, R_ALPHA_REFQUAD},
1009 {BFD_RELOC_GPREL32, R_ALPHA_GPREL32},
1010 {BFD_RELOC_ALPHA_ELF_LITERAL, R_ALPHA_LITERAL},
1011 {BFD_RELOC_ALPHA_LITUSE, R_ALPHA_LITUSE},
1012 {BFD_RELOC_ALPHA_GPDISP, R_ALPHA_GPDISP},
1013 {BFD_RELOC_23_PCREL_S2, R_ALPHA_BRADDR},
1014 {BFD_RELOC_ALPHA_HINT, R_ALPHA_HINT},
1015 {BFD_RELOC_16_PCREL, R_ALPHA_SREL16},
1016 {BFD_RELOC_32_PCREL, R_ALPHA_SREL32},
1017 {BFD_RELOC_64_PCREL, R_ALPHA_SREL64},
1018 {BFD_RELOC_ALPHA_GPREL_HI16, R_ALPHA_GPRELHIGH},
1019 {BFD_RELOC_ALPHA_GPREL_LO16, R_ALPHA_GPRELLOW},
1020 {BFD_RELOC_GPREL16, R_ALPHA_GPREL16},
1021 {BFD_RELOC_ALPHA_BRSGP, R_ALPHA_BRSGP},
1022 {BFD_RELOC_ALPHA_TLSGD, R_ALPHA_TLSGD},
1023 {BFD_RELOC_ALPHA_TLSLDM, R_ALPHA_TLSLDM},
1024 {BFD_RELOC_ALPHA_DTPMOD64, R_ALPHA_DTPMOD64},
1025 {BFD_RELOC_ALPHA_GOTDTPREL16, R_ALPHA_GOTDTPREL},
1026 {BFD_RELOC_ALPHA_DTPREL64, R_ALPHA_DTPREL64},
1027 {BFD_RELOC_ALPHA_DTPREL_HI16, R_ALPHA_DTPRELHI},
1028 {BFD_RELOC_ALPHA_DTPREL_LO16, R_ALPHA_DTPRELLO},
1029 {BFD_RELOC_ALPHA_DTPREL16, R_ALPHA_DTPREL16},
1030 {BFD_RELOC_ALPHA_GOTTPREL16, R_ALPHA_GOTTPREL},
1031 {BFD_RELOC_ALPHA_TPREL64, R_ALPHA_TPREL64},
1032 {BFD_RELOC_ALPHA_TPREL_HI16, R_ALPHA_TPRELHI},
1033 {BFD_RELOC_ALPHA_TPREL_LO16, R_ALPHA_TPRELLO},
1034 {BFD_RELOC_ALPHA_TPREL16, R_ALPHA_TPREL16},
1037 /* Given a BFD reloc type, return a HOWTO structure. */
1039 static reloc_howto_type *
1040 elf64_alpha_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
1041 bfd_reloc_code_real_type code)
1043 const struct elf_reloc_map *i, *e;
1044 i = e = elf64_alpha_reloc_map;
1045 e += sizeof (elf64_alpha_reloc_map) / sizeof (struct elf_reloc_map);
1046 for (; i != e; ++i)
1048 if (i->bfd_reloc_val == code)
1049 return &elf64_alpha_howto_table[i->elf_reloc_val];
1051 return 0;
1054 /* Given an Alpha ELF reloc type, fill in an arelent structure. */
1056 static void
1057 elf64_alpha_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
1058 Elf_Internal_Rela *dst)
1060 unsigned r_type = ELF64_R_TYPE(dst->r_info);
1061 BFD_ASSERT (r_type < (unsigned int) R_ALPHA_max);
1062 cache_ptr->howto = &elf64_alpha_howto_table[r_type];
1065 /* These two relocations create a two-word entry in the got. */
1066 #define alpha_got_entry_size(r_type) \
1067 (r_type == R_ALPHA_TLSGD || r_type == R_ALPHA_TLSLDM ? 16 : 8)
1069 /* This is PT_TLS segment p_vaddr. */
1070 #define alpha_get_dtprel_base(info) \
1071 (elf_hash_table (info)->tls_sec->vma)
1073 /* Main program TLS (whose template starts at PT_TLS p_vaddr)
1074 is assigned offset round(16, PT_TLS p_align). */
1075 #define alpha_get_tprel_base(info) \
1076 (elf_hash_table (info)->tls_sec->vma \
1077 - align_power ((bfd_vma) 16, \
1078 elf_hash_table (info)->tls_sec->alignment_power))
1080 /* Handle an Alpha specific section when reading an object file. This
1081 is called when bfd_section_from_shdr finds a section with an unknown
1082 type.
1083 FIXME: We need to handle the SHF_ALPHA_GPREL flag, but I'm not sure
1084 how to. */
1086 static bfd_boolean
1087 elf64_alpha_section_from_shdr (bfd *abfd,
1088 Elf_Internal_Shdr *hdr,
1089 const char *name,
1090 int shindex)
1092 asection *newsect;
1094 /* There ought to be a place to keep ELF backend specific flags, but
1095 at the moment there isn't one. We just keep track of the
1096 sections by their name, instead. Fortunately, the ABI gives
1097 suggested names for all the MIPS specific sections, so we will
1098 probably get away with this. */
1099 switch (hdr->sh_type)
1101 case SHT_ALPHA_DEBUG:
1102 if (strcmp (name, ".mdebug") != 0)
1103 return FALSE;
1104 break;
1105 default:
1106 return FALSE;
1109 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
1110 return FALSE;
1111 newsect = hdr->bfd_section;
1113 if (hdr->sh_type == SHT_ALPHA_DEBUG)
1115 if (! bfd_set_section_flags (abfd, newsect,
1116 (bfd_get_section_flags (abfd, newsect)
1117 | SEC_DEBUGGING)))
1118 return FALSE;
1121 return TRUE;
1124 /* Convert Alpha specific section flags to bfd internal section flags. */
1126 static bfd_boolean
1127 elf64_alpha_section_flags (flagword *flags, const Elf_Internal_Shdr *hdr)
1129 if (hdr->sh_flags & SHF_ALPHA_GPREL)
1130 *flags |= SEC_SMALL_DATA;
1132 return TRUE;
1135 /* Set the correct type for an Alpha ELF section. We do this by the
1136 section name, which is a hack, but ought to work. */
1138 static bfd_boolean
1139 elf64_alpha_fake_sections (bfd *abfd, Elf_Internal_Shdr *hdr, asection *sec)
1141 register const char *name;
1143 name = bfd_get_section_name (abfd, sec);
1145 if (strcmp (name, ".mdebug") == 0)
1147 hdr->sh_type = SHT_ALPHA_DEBUG;
1148 /* In a shared object on Irix 5.3, the .mdebug section has an
1149 entsize of 0. FIXME: Does this matter? */
1150 if ((abfd->flags & DYNAMIC) != 0 )
1151 hdr->sh_entsize = 0;
1152 else
1153 hdr->sh_entsize = 1;
1155 else if ((sec->flags & SEC_SMALL_DATA)
1156 || strcmp (name, ".sdata") == 0
1157 || strcmp (name, ".sbss") == 0
1158 || strcmp (name, ".lit4") == 0
1159 || strcmp (name, ".lit8") == 0)
1160 hdr->sh_flags |= SHF_ALPHA_GPREL;
1162 return TRUE;
1165 /* Hook called by the linker routine which adds symbols from an object
1166 file. We use it to put .comm items in .sbss, and not .bss. */
1168 static bfd_boolean
1169 elf64_alpha_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
1170 Elf_Internal_Sym *sym,
1171 const char **namep ATTRIBUTE_UNUSED,
1172 flagword *flagsp ATTRIBUTE_UNUSED,
1173 asection **secp, bfd_vma *valp)
1175 if (sym->st_shndx == SHN_COMMON
1176 && !info->relocatable
1177 && sym->st_size <= elf_gp_size (abfd))
1179 /* Common symbols less than or equal to -G nn bytes are
1180 automatically put into .sbss. */
1182 asection *scomm = bfd_get_section_by_name (abfd, ".scommon");
1184 if (scomm == NULL)
1186 scomm = bfd_make_section_with_flags (abfd, ".scommon",
1187 (SEC_ALLOC
1188 | SEC_IS_COMMON
1189 | SEC_LINKER_CREATED));
1190 if (scomm == NULL)
1191 return FALSE;
1194 *secp = scomm;
1195 *valp = sym->st_size;
1198 return TRUE;
1201 /* Create the .got section. */
1203 static bfd_boolean
1204 elf64_alpha_create_got_section (bfd *abfd,
1205 struct bfd_link_info *info ATTRIBUTE_UNUSED)
1207 flagword flags;
1208 asection *s;
1210 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1211 | SEC_LINKER_CREATED);
1212 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
1213 if (s == NULL
1214 || !bfd_set_section_alignment (abfd, s, 3))
1215 return FALSE;
1217 alpha_elf_tdata (abfd)->got = s;
1219 /* Make sure the object's gotobj is set to itself so that we default
1220 to every object with its own .got. We'll merge .gots later once
1221 we've collected each object's info. */
1222 alpha_elf_tdata (abfd)->gotobj = abfd;
1224 return TRUE;
1227 /* Create all the dynamic sections. */
1229 static bfd_boolean
1230 elf64_alpha_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
1232 asection *s;
1233 flagword flags;
1234 struct elf_link_hash_entry *h;
1236 /* We need to create .plt, .rela.plt, .got, and .rela.got sections. */
1238 flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1239 | SEC_LINKER_CREATED
1240 | (elf64_alpha_use_secureplt ? SEC_READONLY : 0));
1241 s = bfd_make_section_anyway_with_flags (abfd, ".plt", flags);
1242 if (s == NULL || ! bfd_set_section_alignment (abfd, s, 4))
1243 return FALSE;
1245 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
1246 .plt section. */
1247 if (!_bfd_elf_define_linkage_sym (abfd, info, s,
1248 "_PROCEDURE_LINKAGE_TABLE_"))
1249 return FALSE;
1251 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1252 | SEC_LINKER_CREATED | SEC_READONLY);
1253 s = bfd_make_section_anyway_with_flags (abfd, ".rela.plt", flags);
1254 if (s == NULL || ! bfd_set_section_alignment (abfd, s, 3))
1255 return FALSE;
1257 if (elf64_alpha_use_secureplt)
1259 flags = SEC_ALLOC | SEC_LINKER_CREATED;
1260 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
1261 if (s == NULL || ! bfd_set_section_alignment (abfd, s, 3))
1262 return FALSE;
1265 /* We may or may not have created a .got section for this object, but
1266 we definitely havn't done the rest of the work. */
1268 if (alpha_elf_tdata(abfd)->gotobj == NULL)
1270 if (!elf64_alpha_create_got_section (abfd, info))
1271 return FALSE;
1274 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1275 | SEC_LINKER_CREATED | SEC_READONLY);
1276 s = bfd_make_section_anyway_with_flags (abfd, ".rela.got", flags);
1277 if (s == NULL
1278 || !bfd_set_section_alignment (abfd, s, 3))
1279 return FALSE;
1281 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the
1282 dynobj's .got section. We don't do this in the linker script
1283 because we don't want to define the symbol if we are not creating
1284 a global offset table. */
1285 h = _bfd_elf_define_linkage_sym (abfd, info, alpha_elf_tdata(abfd)->got,
1286 "_GLOBAL_OFFSET_TABLE_");
1287 elf_hash_table (info)->hgot = h;
1288 if (h == NULL)
1289 return FALSE;
1291 return TRUE;
1294 /* Read ECOFF debugging information from a .mdebug section into a
1295 ecoff_debug_info structure. */
1297 static bfd_boolean
1298 elf64_alpha_read_ecoff_info (bfd *abfd, asection *section,
1299 struct ecoff_debug_info *debug)
1301 HDRR *symhdr;
1302 const struct ecoff_debug_swap *swap;
1303 char *ext_hdr = NULL;
1305 swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
1306 memset (debug, 0, sizeof (*debug));
1308 ext_hdr = (char *) bfd_malloc (swap->external_hdr_size);
1309 if (ext_hdr == NULL && swap->external_hdr_size != 0)
1310 goto error_return;
1312 if (! bfd_get_section_contents (abfd, section, ext_hdr, (file_ptr) 0,
1313 swap->external_hdr_size))
1314 goto error_return;
1316 symhdr = &debug->symbolic_header;
1317 (*swap->swap_hdr_in) (abfd, ext_hdr, symhdr);
1319 /* The symbolic header contains absolute file offsets and sizes to
1320 read. */
1321 #define READ(ptr, offset, count, size, type) \
1322 if (symhdr->count == 0) \
1323 debug->ptr = NULL; \
1324 else \
1326 bfd_size_type amt = (bfd_size_type) size * symhdr->count; \
1327 debug->ptr = (type) bfd_malloc (amt); \
1328 if (debug->ptr == NULL) \
1329 goto error_return; \
1330 if (bfd_seek (abfd, (file_ptr) symhdr->offset, SEEK_SET) != 0 \
1331 || bfd_bread (debug->ptr, amt, abfd) != amt) \
1332 goto error_return; \
1335 READ (line, cbLineOffset, cbLine, sizeof (unsigned char), unsigned char *);
1336 READ (external_dnr, cbDnOffset, idnMax, swap->external_dnr_size, PTR);
1337 READ (external_pdr, cbPdOffset, ipdMax, swap->external_pdr_size, PTR);
1338 READ (external_sym, cbSymOffset, isymMax, swap->external_sym_size, PTR);
1339 READ (external_opt, cbOptOffset, ioptMax, swap->external_opt_size, PTR);
1340 READ (external_aux, cbAuxOffset, iauxMax, sizeof (union aux_ext),
1341 union aux_ext *);
1342 READ (ss, cbSsOffset, issMax, sizeof (char), char *);
1343 READ (ssext, cbSsExtOffset, issExtMax, sizeof (char), char *);
1344 READ (external_fdr, cbFdOffset, ifdMax, swap->external_fdr_size, PTR);
1345 READ (external_rfd, cbRfdOffset, crfd, swap->external_rfd_size, PTR);
1346 READ (external_ext, cbExtOffset, iextMax, swap->external_ext_size, PTR);
1347 #undef READ
1349 debug->fdr = NULL;
1351 return TRUE;
1353 error_return:
1354 if (ext_hdr != NULL)
1355 free (ext_hdr);
1356 if (debug->line != NULL)
1357 free (debug->line);
1358 if (debug->external_dnr != NULL)
1359 free (debug->external_dnr);
1360 if (debug->external_pdr != NULL)
1361 free (debug->external_pdr);
1362 if (debug->external_sym != NULL)
1363 free (debug->external_sym);
1364 if (debug->external_opt != NULL)
1365 free (debug->external_opt);
1366 if (debug->external_aux != NULL)
1367 free (debug->external_aux);
1368 if (debug->ss != NULL)
1369 free (debug->ss);
1370 if (debug->ssext != NULL)
1371 free (debug->ssext);
1372 if (debug->external_fdr != NULL)
1373 free (debug->external_fdr);
1374 if (debug->external_rfd != NULL)
1375 free (debug->external_rfd);
1376 if (debug->external_ext != NULL)
1377 free (debug->external_ext);
1378 return FALSE;
1381 /* Alpha ELF local labels start with '$'. */
1383 static bfd_boolean
1384 elf64_alpha_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED, const char *name)
1386 return name[0] == '$';
1389 /* Alpha ELF follows MIPS ELF in using a special find_nearest_line
1390 routine in order to handle the ECOFF debugging information. We
1391 still call this mips_elf_find_line because of the slot
1392 find_line_info in elf_obj_tdata is declared that way. */
1394 struct mips_elf_find_line
1396 struct ecoff_debug_info d;
1397 struct ecoff_find_line i;
1400 static bfd_boolean
1401 elf64_alpha_find_nearest_line (bfd *abfd, asection *section, asymbol **symbols,
1402 bfd_vma offset, const char **filename_ptr,
1403 const char **functionname_ptr,
1404 unsigned int *line_ptr)
1406 asection *msec;
1408 if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
1409 filename_ptr, functionname_ptr,
1410 line_ptr, 0,
1411 &elf_tdata (abfd)->dwarf2_find_line_info))
1412 return TRUE;
1414 msec = bfd_get_section_by_name (abfd, ".mdebug");
1415 if (msec != NULL)
1417 flagword origflags;
1418 struct mips_elf_find_line *fi;
1419 const struct ecoff_debug_swap * const swap =
1420 get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
1422 /* If we are called during a link, alpha_elf_final_link may have
1423 cleared the SEC_HAS_CONTENTS field. We force it back on here
1424 if appropriate (which it normally will be). */
1425 origflags = msec->flags;
1426 if (elf_section_data (msec)->this_hdr.sh_type != SHT_NOBITS)
1427 msec->flags |= SEC_HAS_CONTENTS;
1429 fi = elf_tdata (abfd)->find_line_info;
1430 if (fi == NULL)
1432 bfd_size_type external_fdr_size;
1433 char *fraw_src;
1434 char *fraw_end;
1435 struct fdr *fdr_ptr;
1436 bfd_size_type amt = sizeof (struct mips_elf_find_line);
1438 fi = (struct mips_elf_find_line *) bfd_zalloc (abfd, amt);
1439 if (fi == NULL)
1441 msec->flags = origflags;
1442 return FALSE;
1445 if (!elf64_alpha_read_ecoff_info (abfd, msec, &fi->d))
1447 msec->flags = origflags;
1448 return FALSE;
1451 /* Swap in the FDR information. */
1452 amt = fi->d.symbolic_header.ifdMax * sizeof (struct fdr);
1453 fi->d.fdr = (struct fdr *) bfd_alloc (abfd, amt);
1454 if (fi->d.fdr == NULL)
1456 msec->flags = origflags;
1457 return FALSE;
1459 external_fdr_size = swap->external_fdr_size;
1460 fdr_ptr = fi->d.fdr;
1461 fraw_src = (char *) fi->d.external_fdr;
1462 fraw_end = (fraw_src
1463 + fi->d.symbolic_header.ifdMax * external_fdr_size);
1464 for (; fraw_src < fraw_end; fraw_src += external_fdr_size, fdr_ptr++)
1465 (*swap->swap_fdr_in) (abfd, (PTR) fraw_src, fdr_ptr);
1467 elf_tdata (abfd)->find_line_info = fi;
1469 /* Note that we don't bother to ever free this information.
1470 find_nearest_line is either called all the time, as in
1471 objdump -l, so the information should be saved, or it is
1472 rarely called, as in ld error messages, so the memory
1473 wasted is unimportant. Still, it would probably be a
1474 good idea for free_cached_info to throw it away. */
1477 if (_bfd_ecoff_locate_line (abfd, section, offset, &fi->d, swap,
1478 &fi->i, filename_ptr, functionname_ptr,
1479 line_ptr))
1481 msec->flags = origflags;
1482 return TRUE;
1485 msec->flags = origflags;
1488 /* Fall back on the generic ELF find_nearest_line routine. */
1490 return _bfd_elf_find_nearest_line (abfd, section, symbols, offset,
1491 filename_ptr, functionname_ptr,
1492 line_ptr);
1495 /* Structure used to pass information to alpha_elf_output_extsym. */
1497 struct extsym_info
1499 bfd *abfd;
1500 struct bfd_link_info *info;
1501 struct ecoff_debug_info *debug;
1502 const struct ecoff_debug_swap *swap;
1503 bfd_boolean failed;
1506 static bfd_boolean
1507 elf64_alpha_output_extsym (struct alpha_elf_link_hash_entry *h, PTR data)
1509 struct extsym_info *einfo = (struct extsym_info *) data;
1510 bfd_boolean strip;
1511 asection *sec, *output_section;
1513 if (h->root.root.type == bfd_link_hash_warning)
1514 h = (struct alpha_elf_link_hash_entry *) h->root.root.u.i.link;
1516 if (h->root.indx == -2)
1517 strip = FALSE;
1518 else if ((h->root.def_dynamic
1519 || h->root.ref_dynamic
1520 || h->root.root.type == bfd_link_hash_new)
1521 && !h->root.def_regular
1522 && !h->root.ref_regular)
1523 strip = TRUE;
1524 else if (einfo->info->strip == strip_all
1525 || (einfo->info->strip == strip_some
1526 && bfd_hash_lookup (einfo->info->keep_hash,
1527 h->root.root.root.string,
1528 FALSE, FALSE) == NULL))
1529 strip = TRUE;
1530 else
1531 strip = FALSE;
1533 if (strip)
1534 return TRUE;
1536 if (h->esym.ifd == -2)
1538 h->esym.jmptbl = 0;
1539 h->esym.cobol_main = 0;
1540 h->esym.weakext = 0;
1541 h->esym.reserved = 0;
1542 h->esym.ifd = ifdNil;
1543 h->esym.asym.value = 0;
1544 h->esym.asym.st = stGlobal;
1546 if (h->root.root.type != bfd_link_hash_defined
1547 && h->root.root.type != bfd_link_hash_defweak)
1548 h->esym.asym.sc = scAbs;
1549 else
1551 const char *name;
1553 sec = h->root.root.u.def.section;
1554 output_section = sec->output_section;
1556 /* When making a shared library and symbol h is the one from
1557 the another shared library, OUTPUT_SECTION may be null. */
1558 if (output_section == NULL)
1559 h->esym.asym.sc = scUndefined;
1560 else
1562 name = bfd_section_name (output_section->owner, output_section);
1564 if (strcmp (name, ".text") == 0)
1565 h->esym.asym.sc = scText;
1566 else if (strcmp (name, ".data") == 0)
1567 h->esym.asym.sc = scData;
1568 else if (strcmp (name, ".sdata") == 0)
1569 h->esym.asym.sc = scSData;
1570 else if (strcmp (name, ".rodata") == 0
1571 || strcmp (name, ".rdata") == 0)
1572 h->esym.asym.sc = scRData;
1573 else if (strcmp (name, ".bss") == 0)
1574 h->esym.asym.sc = scBss;
1575 else if (strcmp (name, ".sbss") == 0)
1576 h->esym.asym.sc = scSBss;
1577 else if (strcmp (name, ".init") == 0)
1578 h->esym.asym.sc = scInit;
1579 else if (strcmp (name, ".fini") == 0)
1580 h->esym.asym.sc = scFini;
1581 else
1582 h->esym.asym.sc = scAbs;
1586 h->esym.asym.reserved = 0;
1587 h->esym.asym.index = indexNil;
1590 if (h->root.root.type == bfd_link_hash_common)
1591 h->esym.asym.value = h->root.root.u.c.size;
1592 else if (h->root.root.type == bfd_link_hash_defined
1593 || h->root.root.type == bfd_link_hash_defweak)
1595 if (h->esym.asym.sc == scCommon)
1596 h->esym.asym.sc = scBss;
1597 else if (h->esym.asym.sc == scSCommon)
1598 h->esym.asym.sc = scSBss;
1600 sec = h->root.root.u.def.section;
1601 output_section = sec->output_section;
1602 if (output_section != NULL)
1603 h->esym.asym.value = (h->root.root.u.def.value
1604 + sec->output_offset
1605 + output_section->vma);
1606 else
1607 h->esym.asym.value = 0;
1610 if (! bfd_ecoff_debug_one_external (einfo->abfd, einfo->debug, einfo->swap,
1611 h->root.root.root.string,
1612 &h->esym))
1614 einfo->failed = TRUE;
1615 return FALSE;
1618 return TRUE;
1621 /* Search for and possibly create a got entry. */
1623 static struct alpha_elf_got_entry *
1624 get_got_entry (bfd *abfd, struct alpha_elf_link_hash_entry *h,
1625 unsigned long r_type, unsigned long r_symndx,
1626 bfd_vma r_addend)
1628 struct alpha_elf_got_entry *gotent;
1629 struct alpha_elf_got_entry **slot;
1631 if (h)
1632 slot = &h->got_entries;
1633 else
1635 /* This is a local .got entry -- record for merge. */
1637 struct alpha_elf_got_entry **local_got_entries;
1639 local_got_entries = alpha_elf_tdata(abfd)->local_got_entries;
1640 if (!local_got_entries)
1642 bfd_size_type size;
1643 Elf_Internal_Shdr *symtab_hdr;
1645 symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
1646 size = symtab_hdr->sh_info;
1647 size *= sizeof (struct alpha_elf_got_entry *);
1649 local_got_entries
1650 = (struct alpha_elf_got_entry **) bfd_zalloc (abfd, size);
1651 if (!local_got_entries)
1652 return NULL;
1654 alpha_elf_tdata (abfd)->local_got_entries = local_got_entries;
1657 slot = &local_got_entries[r_symndx];
1660 for (gotent = *slot; gotent ; gotent = gotent->next)
1661 if (gotent->gotobj == abfd
1662 && gotent->reloc_type == r_type
1663 && gotent->addend == r_addend)
1664 break;
1666 if (!gotent)
1668 int entry_size;
1669 bfd_size_type amt;
1671 amt = sizeof (struct alpha_elf_got_entry);
1672 gotent = (struct alpha_elf_got_entry *) bfd_alloc (abfd, amt);
1673 if (!gotent)
1674 return NULL;
1676 gotent->gotobj = abfd;
1677 gotent->addend = r_addend;
1678 gotent->got_offset = -1;
1679 gotent->plt_offset = -1;
1680 gotent->use_count = 1;
1681 gotent->reloc_type = r_type;
1682 gotent->reloc_done = 0;
1683 gotent->reloc_xlated = 0;
1685 gotent->next = *slot;
1686 *slot = gotent;
1688 entry_size = alpha_got_entry_size (r_type);
1689 alpha_elf_tdata (abfd)->total_got_size += entry_size;
1690 if (!h)
1691 alpha_elf_tdata(abfd)->local_got_size += entry_size;
1693 else
1694 gotent->use_count += 1;
1696 return gotent;
1699 static bfd_boolean
1700 elf64_alpha_want_plt (struct alpha_elf_link_hash_entry *ah)
1702 return ((ah->root.type == STT_FUNC
1703 || ah->root.root.type == bfd_link_hash_undefweak
1704 || ah->root.root.type == bfd_link_hash_undefined)
1705 && (ah->flags & ALPHA_ELF_LINK_HASH_LU_PLT) != 0
1706 && (ah->flags & ~ALPHA_ELF_LINK_HASH_LU_PLT) == 0);
1709 /* Handle dynamic relocations when doing an Alpha ELF link. */
1711 static bfd_boolean
1712 elf64_alpha_check_relocs (bfd *abfd, struct bfd_link_info *info,
1713 asection *sec, const Elf_Internal_Rela *relocs)
1715 bfd *dynobj;
1716 asection *sreloc;
1717 const char *rel_sec_name;
1718 Elf_Internal_Shdr *symtab_hdr;
1719 struct alpha_elf_link_hash_entry **sym_hashes;
1720 const Elf_Internal_Rela *rel, *relend;
1721 bfd_size_type amt;
1723 if (info->relocatable)
1724 return TRUE;
1726 /* Don't do anything special with non-loaded, non-alloced sections.
1727 In particular, any relocs in such sections should not affect GOT
1728 and PLT reference counting (ie. we don't allow them to create GOT
1729 or PLT entries), there's no possibility or desire to optimize TLS
1730 relocs, and there's not much point in propagating relocs to shared
1731 libs that the dynamic linker won't relocate. */
1732 if ((sec->flags & SEC_ALLOC) == 0)
1733 return TRUE;
1735 dynobj = elf_hash_table(info)->dynobj;
1736 if (dynobj == NULL)
1737 elf_hash_table(info)->dynobj = dynobj = abfd;
1739 sreloc = NULL;
1740 rel_sec_name = NULL;
1741 symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
1742 sym_hashes = alpha_elf_sym_hashes(abfd);
1744 relend = relocs + sec->reloc_count;
1745 for (rel = relocs; rel < relend; ++rel)
1747 enum {
1748 NEED_GOT = 1,
1749 NEED_GOT_ENTRY = 2,
1750 NEED_DYNREL = 4
1753 unsigned long r_symndx, r_type;
1754 struct alpha_elf_link_hash_entry *h;
1755 unsigned int gotent_flags;
1756 bfd_boolean maybe_dynamic;
1757 unsigned int need;
1758 bfd_vma addend;
1760 r_symndx = ELF64_R_SYM (rel->r_info);
1761 if (r_symndx < symtab_hdr->sh_info)
1762 h = NULL;
1763 else
1765 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1767 while (h->root.root.type == bfd_link_hash_indirect
1768 || h->root.root.type == bfd_link_hash_warning)
1769 h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link;
1771 h->root.ref_regular = 1;
1774 /* We can only get preliminary data on whether a symbol is
1775 locally or externally defined, as not all of the input files
1776 have yet been processed. Do something with what we know, as
1777 this may help reduce memory usage and processing time later. */
1778 maybe_dynamic = FALSE;
1779 if (h && ((info->shared
1780 && (!info->symbolic
1781 || info->unresolved_syms_in_shared_libs == RM_IGNORE))
1782 || !h->root.def_regular
1783 || h->root.root.type == bfd_link_hash_defweak))
1784 maybe_dynamic = TRUE;
1786 need = 0;
1787 gotent_flags = 0;
1788 r_type = ELF64_R_TYPE (rel->r_info);
1789 addend = rel->r_addend;
1791 switch (r_type)
1793 case R_ALPHA_LITERAL:
1794 need = NEED_GOT | NEED_GOT_ENTRY;
1796 /* Remember how this literal is used from its LITUSEs.
1797 This will be important when it comes to decide if we can
1798 create a .plt entry for a function symbol. */
1799 while (++rel < relend && ELF64_R_TYPE (rel->r_info) == R_ALPHA_LITUSE)
1800 if (rel->r_addend >= 1 && rel->r_addend <= 6)
1801 gotent_flags |= 1 << rel->r_addend;
1802 --rel;
1804 /* No LITUSEs -- presumably the address is used somehow. */
1805 if (gotent_flags == 0)
1806 gotent_flags = ALPHA_ELF_LINK_HASH_LU_ADDR;
1807 break;
1809 case R_ALPHA_GPDISP:
1810 case R_ALPHA_GPREL16:
1811 case R_ALPHA_GPREL32:
1812 case R_ALPHA_GPRELHIGH:
1813 case R_ALPHA_GPRELLOW:
1814 case R_ALPHA_BRSGP:
1815 need = NEED_GOT;
1816 break;
1818 case R_ALPHA_REFLONG:
1819 case R_ALPHA_REFQUAD:
1820 if (info->shared || maybe_dynamic)
1821 need = NEED_DYNREL;
1822 break;
1824 case R_ALPHA_TLSLDM:
1825 /* The symbol for a TLSLDM reloc is ignored. Collapse the
1826 reloc to the 0 symbol so that they all match. */
1827 r_symndx = 0;
1828 h = 0;
1829 maybe_dynamic = FALSE;
1830 /* FALLTHRU */
1832 case R_ALPHA_TLSGD:
1833 case R_ALPHA_GOTDTPREL:
1834 need = NEED_GOT | NEED_GOT_ENTRY;
1835 break;
1837 case R_ALPHA_GOTTPREL:
1838 need = NEED_GOT | NEED_GOT_ENTRY;
1839 gotent_flags = ALPHA_ELF_LINK_HASH_TLS_IE;
1840 if (info->shared)
1841 info->flags |= DF_STATIC_TLS;
1842 break;
1844 case R_ALPHA_TPREL64:
1845 if (info->shared || maybe_dynamic)
1846 need = NEED_DYNREL;
1847 if (info->shared)
1848 info->flags |= DF_STATIC_TLS;
1849 break;
1852 if (need & NEED_GOT)
1854 if (alpha_elf_tdata(abfd)->gotobj == NULL)
1856 if (!elf64_alpha_create_got_section (abfd, info))
1857 return FALSE;
1861 if (need & NEED_GOT_ENTRY)
1863 struct alpha_elf_got_entry *gotent;
1865 gotent = get_got_entry (abfd, h, r_type, r_symndx, addend);
1866 if (!gotent)
1867 return FALSE;
1869 if (gotent_flags)
1871 gotent->flags |= gotent_flags;
1872 if (h)
1874 gotent_flags |= h->flags;
1875 h->flags = gotent_flags;
1877 /* Make a guess as to whether a .plt entry is needed. */
1878 /* ??? It appears that we won't make it into
1879 adjust_dynamic_symbol for symbols that remain
1880 totally undefined. Copying this check here means
1881 we can create a plt entry for them too. */
1882 h->root.needs_plt
1883 = (maybe_dynamic && elf64_alpha_want_plt (h));
1888 if (need & NEED_DYNREL)
1890 if (rel_sec_name == NULL)
1892 rel_sec_name = (bfd_elf_string_from_elf_section
1893 (abfd, elf_elfheader(abfd)->e_shstrndx,
1894 elf_section_data(sec)->rel_hdr.sh_name));
1895 if (rel_sec_name == NULL)
1896 return FALSE;
1898 BFD_ASSERT (strncmp (rel_sec_name, ".rela", 5) == 0
1899 && strcmp (bfd_get_section_name (abfd, sec),
1900 rel_sec_name+5) == 0);
1903 /* We need to create the section here now whether we eventually
1904 use it or not so that it gets mapped to an output section by
1905 the linker. If not used, we'll kill it in
1906 size_dynamic_sections. */
1907 if (sreloc == NULL)
1909 sreloc = bfd_get_section_by_name (dynobj, rel_sec_name);
1910 if (sreloc == NULL)
1912 flagword flags;
1914 flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY
1915 | SEC_LINKER_CREATED | SEC_READONLY);
1916 if (sec->flags & SEC_ALLOC)
1917 flags |= SEC_ALLOC | SEC_LOAD;
1918 sreloc = bfd_make_section_with_flags (dynobj,
1919 rel_sec_name,
1920 flags);
1921 if (sreloc == NULL
1922 || !bfd_set_section_alignment (dynobj, sreloc, 3))
1923 return FALSE;
1927 if (h)
1929 /* Since we havn't seen all of the input symbols yet, we
1930 don't know whether we'll actually need a dynamic relocation
1931 entry for this reloc. So make a record of it. Once we
1932 find out if this thing needs dynamic relocation we'll
1933 expand the relocation sections by the appropriate amount. */
1935 struct alpha_elf_reloc_entry *rent;
1937 for (rent = h->reloc_entries; rent; rent = rent->next)
1938 if (rent->rtype == r_type && rent->srel == sreloc)
1939 break;
1941 if (!rent)
1943 amt = sizeof (struct alpha_elf_reloc_entry);
1944 rent = (struct alpha_elf_reloc_entry *) bfd_alloc (abfd, amt);
1945 if (!rent)
1946 return FALSE;
1948 rent->srel = sreloc;
1949 rent->rtype = r_type;
1950 rent->count = 1;
1951 rent->reltext = (sec->flags & SEC_READONLY) != 0;
1953 rent->next = h->reloc_entries;
1954 h->reloc_entries = rent;
1956 else
1957 rent->count++;
1959 else if (info->shared)
1961 /* If this is a shared library, and the section is to be
1962 loaded into memory, we need a RELATIVE reloc. */
1963 sreloc->size += sizeof (Elf64_External_Rela);
1964 if (sec->flags & SEC_READONLY)
1965 info->flags |= DF_TEXTREL;
1970 return TRUE;
1973 /* Adjust a symbol defined by a dynamic object and referenced by a
1974 regular object. The current definition is in some section of the
1975 dynamic object, but we're not including those sections. We have to
1976 change the definition to something the rest of the link can
1977 understand. */
1979 static bfd_boolean
1980 elf64_alpha_adjust_dynamic_symbol (struct bfd_link_info *info,
1981 struct elf_link_hash_entry *h)
1983 bfd *dynobj;
1984 asection *s;
1985 struct alpha_elf_link_hash_entry *ah;
1987 dynobj = elf_hash_table(info)->dynobj;
1988 ah = (struct alpha_elf_link_hash_entry *)h;
1990 /* Now that we've seen all of the input symbols, finalize our decision
1991 about whether this symbol should get a .plt entry. Irritatingly, it
1992 is common for folk to leave undefined symbols in shared libraries,
1993 and they still expect lazy binding; accept undefined symbols in lieu
1994 of STT_FUNC. */
1995 if (alpha_elf_dynamic_symbol_p (h, info) && elf64_alpha_want_plt (ah))
1997 h->needs_plt = TRUE;
1999 s = bfd_get_section_by_name(dynobj, ".plt");
2000 if (!s && !elf64_alpha_create_dynamic_sections (dynobj, info))
2001 return FALSE;
2003 /* We need one plt entry per got subsection. Delay allocation of
2004 the actual plt entries until size_plt_section, called from
2005 size_dynamic_sections or during relaxation. */
2007 return TRUE;
2009 else
2010 h->needs_plt = FALSE;
2012 /* If this is a weak symbol, and there is a real definition, the
2013 processor independent code will have arranged for us to see the
2014 real definition first, and we can just use the same value. */
2015 if (h->u.weakdef != NULL)
2017 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2018 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2019 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2020 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2021 return TRUE;
2024 /* This is a reference to a symbol defined by a dynamic object which
2025 is not a function. The Alpha, since it uses .got entries for all
2026 symbols even in regular objects, does not need the hackery of a
2027 .dynbss section and COPY dynamic relocations. */
2029 return TRUE;
2032 /* Symbol versioning can create new symbols, and make our old symbols
2033 indirect to the new ones. Consolidate the got and reloc information
2034 in these situations. */
2036 static bfd_boolean
2037 elf64_alpha_merge_ind_symbols (struct alpha_elf_link_hash_entry *hi,
2038 PTR dummy ATTRIBUTE_UNUSED)
2040 struct alpha_elf_link_hash_entry *hs;
2042 if (hi->root.root.type != bfd_link_hash_indirect)
2043 return TRUE;
2044 hs = hi;
2045 do {
2046 hs = (struct alpha_elf_link_hash_entry *)hs->root.root.u.i.link;
2047 } while (hs->root.root.type == bfd_link_hash_indirect);
2049 /* Merge the flags. Whee. */
2051 hs->flags |= hi->flags;
2053 /* Merge the .got entries. Cannibalize the old symbol's list in
2054 doing so, since we don't need it anymore. */
2056 if (hs->got_entries == NULL)
2057 hs->got_entries = hi->got_entries;
2058 else
2060 struct alpha_elf_got_entry *gi, *gs, *gin, *gsh;
2062 gsh = hs->got_entries;
2063 for (gi = hi->got_entries; gi ; gi = gin)
2065 gin = gi->next;
2066 for (gs = gsh; gs ; gs = gs->next)
2067 if (gi->gotobj == gs->gotobj
2068 && gi->reloc_type == gs->reloc_type
2069 && gi->addend == gs->addend)
2071 gi->use_count += gs->use_count;
2072 goto got_found;
2074 gi->next = hs->got_entries;
2075 hs->got_entries = gi;
2076 got_found:;
2079 hi->got_entries = NULL;
2081 /* And similar for the reloc entries. */
2083 if (hs->reloc_entries == NULL)
2084 hs->reloc_entries = hi->reloc_entries;
2085 else
2087 struct alpha_elf_reloc_entry *ri, *rs, *rin, *rsh;
2089 rsh = hs->reloc_entries;
2090 for (ri = hi->reloc_entries; ri ; ri = rin)
2092 rin = ri->next;
2093 for (rs = rsh; rs ; rs = rs->next)
2094 if (ri->rtype == rs->rtype && ri->srel == rs->srel)
2096 rs->count += ri->count;
2097 goto found_reloc;
2099 ri->next = hs->reloc_entries;
2100 hs->reloc_entries = ri;
2101 found_reloc:;
2104 hi->reloc_entries = NULL;
2106 return TRUE;
2109 /* Is it possible to merge two object file's .got tables? */
2111 static bfd_boolean
2112 elf64_alpha_can_merge_gots (bfd *a, bfd *b)
2114 int total = alpha_elf_tdata (a)->total_got_size;
2115 bfd *bsub;
2117 /* Trivial quick fallout test. */
2118 if (total + alpha_elf_tdata (b)->total_got_size <= MAX_GOT_SIZE)
2119 return TRUE;
2121 /* By their nature, local .got entries cannot be merged. */
2122 if ((total += alpha_elf_tdata (b)->local_got_size) > MAX_GOT_SIZE)
2123 return FALSE;
2125 /* Failing the common trivial comparison, we must effectively
2126 perform the merge. Not actually performing the merge means that
2127 we don't have to store undo information in case we fail. */
2128 for (bsub = b; bsub ; bsub = alpha_elf_tdata (bsub)->in_got_link_next)
2130 struct alpha_elf_link_hash_entry **hashes = alpha_elf_sym_hashes (bsub);
2131 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (bsub)->symtab_hdr;
2132 int i, n;
2134 n = NUM_SHDR_ENTRIES (symtab_hdr) - symtab_hdr->sh_info;
2135 for (i = 0; i < n; ++i)
2137 struct alpha_elf_got_entry *ae, *be;
2138 struct alpha_elf_link_hash_entry *h;
2140 h = hashes[i];
2141 while (h->root.root.type == bfd_link_hash_indirect
2142 || h->root.root.type == bfd_link_hash_warning)
2143 h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link;
2145 for (be = h->got_entries; be ; be = be->next)
2147 if (be->use_count == 0)
2148 continue;
2149 if (be->gotobj != b)
2150 continue;
2152 for (ae = h->got_entries; ae ; ae = ae->next)
2153 if (ae->gotobj == a
2154 && ae->reloc_type == be->reloc_type
2155 && ae->addend == be->addend)
2156 goto global_found;
2158 total += alpha_got_entry_size (be->reloc_type);
2159 if (total > MAX_GOT_SIZE)
2160 return FALSE;
2161 global_found:;
2166 return TRUE;
2169 /* Actually merge two .got tables. */
2171 static void
2172 elf64_alpha_merge_gots (bfd *a, bfd *b)
2174 int total = alpha_elf_tdata (a)->total_got_size;
2175 bfd *bsub;
2177 /* Remember local expansion. */
2179 int e = alpha_elf_tdata (b)->local_got_size;
2180 total += e;
2181 alpha_elf_tdata (a)->local_got_size += e;
2184 for (bsub = b; bsub ; bsub = alpha_elf_tdata (bsub)->in_got_link_next)
2186 struct alpha_elf_got_entry **local_got_entries;
2187 struct alpha_elf_link_hash_entry **hashes;
2188 Elf_Internal_Shdr *symtab_hdr;
2189 int i, n;
2191 /* Let the local .got entries know they are part of a new subsegment. */
2192 local_got_entries = alpha_elf_tdata (bsub)->local_got_entries;
2193 if (local_got_entries)
2195 n = elf_tdata (bsub)->symtab_hdr.sh_info;
2196 for (i = 0; i < n; ++i)
2198 struct alpha_elf_got_entry *ent;
2199 for (ent = local_got_entries[i]; ent; ent = ent->next)
2200 ent->gotobj = a;
2204 /* Merge the global .got entries. */
2205 hashes = alpha_elf_sym_hashes (bsub);
2206 symtab_hdr = &elf_tdata (bsub)->symtab_hdr;
2208 n = NUM_SHDR_ENTRIES (symtab_hdr) - symtab_hdr->sh_info;
2209 for (i = 0; i < n; ++i)
2211 struct alpha_elf_got_entry *ae, *be, **pbe, **start;
2212 struct alpha_elf_link_hash_entry *h;
2214 h = hashes[i];
2215 while (h->root.root.type == bfd_link_hash_indirect
2216 || h->root.root.type == bfd_link_hash_warning)
2217 h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link;
2219 pbe = start = &h->got_entries;
2220 while ((be = *pbe) != NULL)
2222 if (be->use_count == 0)
2224 *pbe = be->next;
2225 memset (be, 0xa5, sizeof (*be));
2226 goto kill;
2228 if (be->gotobj != b)
2229 goto next;
2231 for (ae = *start; ae ; ae = ae->next)
2232 if (ae->gotobj == a
2233 && ae->reloc_type == be->reloc_type
2234 && ae->addend == be->addend)
2236 ae->flags |= be->flags;
2237 ae->use_count += be->use_count;
2238 *pbe = be->next;
2239 memset (be, 0xa5, sizeof (*be));
2240 goto kill;
2242 be->gotobj = a;
2243 total += alpha_got_entry_size (be->reloc_type);
2245 next:;
2246 pbe = &be->next;
2247 kill:;
2251 alpha_elf_tdata (bsub)->gotobj = a;
2253 alpha_elf_tdata (a)->total_got_size = total;
2255 /* Merge the two in_got chains. */
2257 bfd *next;
2259 bsub = a;
2260 while ((next = alpha_elf_tdata (bsub)->in_got_link_next) != NULL)
2261 bsub = next;
2263 alpha_elf_tdata (bsub)->in_got_link_next = b;
2267 /* Calculate the offsets for the got entries. */
2269 static bfd_boolean
2270 elf64_alpha_calc_got_offsets_for_symbol (struct alpha_elf_link_hash_entry *h,
2271 PTR arg ATTRIBUTE_UNUSED)
2273 struct alpha_elf_got_entry *gotent;
2275 if (h->root.root.type == bfd_link_hash_warning)
2276 h = (struct alpha_elf_link_hash_entry *) h->root.root.u.i.link;
2278 for (gotent = h->got_entries; gotent; gotent = gotent->next)
2279 if (gotent->use_count > 0)
2281 struct alpha_elf_obj_tdata *td;
2282 bfd_size_type *plge;
2284 td = alpha_elf_tdata (gotent->gotobj);
2285 plge = &td->got->size;
2286 gotent->got_offset = *plge;
2287 *plge += alpha_got_entry_size (gotent->reloc_type);
2290 return TRUE;
2293 static void
2294 elf64_alpha_calc_got_offsets (struct bfd_link_info *info)
2296 bfd *i, *got_list = alpha_elf_hash_table(info)->got_list;
2298 /* First, zero out the .got sizes, as we may be recalculating the
2299 .got after optimizing it. */
2300 for (i = got_list; i ; i = alpha_elf_tdata(i)->got_link_next)
2301 alpha_elf_tdata(i)->got->size = 0;
2303 /* Next, fill in the offsets for all the global entries. */
2304 alpha_elf_link_hash_traverse (alpha_elf_hash_table (info),
2305 elf64_alpha_calc_got_offsets_for_symbol,
2306 NULL);
2308 /* Finally, fill in the offsets for the local entries. */
2309 for (i = got_list; i ; i = alpha_elf_tdata(i)->got_link_next)
2311 bfd_size_type got_offset = alpha_elf_tdata(i)->got->size;
2312 bfd *j;
2314 for (j = i; j ; j = alpha_elf_tdata(j)->in_got_link_next)
2316 struct alpha_elf_got_entry **local_got_entries, *gotent;
2317 int k, n;
2319 local_got_entries = alpha_elf_tdata(j)->local_got_entries;
2320 if (!local_got_entries)
2321 continue;
2323 for (k = 0, n = elf_tdata(j)->symtab_hdr.sh_info; k < n; ++k)
2324 for (gotent = local_got_entries[k]; gotent; gotent = gotent->next)
2325 if (gotent->use_count > 0)
2327 gotent->got_offset = got_offset;
2328 got_offset += alpha_got_entry_size (gotent->reloc_type);
2332 alpha_elf_tdata(i)->got->size = got_offset;
2336 /* Constructs the gots. */
2338 static bfd_boolean
2339 elf64_alpha_size_got_sections (struct bfd_link_info *info)
2341 bfd *i, *got_list, *cur_got_obj = NULL;
2342 int something_changed = 0;
2344 got_list = alpha_elf_hash_table (info)->got_list;
2346 /* On the first time through, pretend we have an existing got list
2347 consisting of all of the input files. */
2348 if (got_list == NULL)
2350 for (i = info->input_bfds; i ; i = i->link_next)
2352 bfd *this_got = alpha_elf_tdata (i)->gotobj;
2353 if (this_got == NULL)
2354 continue;
2356 /* We are assuming no merging has yet occurred. */
2357 BFD_ASSERT (this_got == i);
2359 if (alpha_elf_tdata (this_got)->total_got_size > MAX_GOT_SIZE)
2361 /* Yikes! A single object file has too many entries. */
2362 (*_bfd_error_handler)
2363 (_("%B: .got subsegment exceeds 64K (size %d)"),
2364 i, alpha_elf_tdata (this_got)->total_got_size);
2365 return FALSE;
2368 if (got_list == NULL)
2369 got_list = this_got;
2370 else
2371 alpha_elf_tdata(cur_got_obj)->got_link_next = this_got;
2372 cur_got_obj = this_got;
2375 /* Strange degenerate case of no got references. */
2376 if (got_list == NULL)
2377 return TRUE;
2379 alpha_elf_hash_table (info)->got_list = got_list;
2381 /* Force got offsets to be recalculated. */
2382 something_changed = 1;
2385 cur_got_obj = got_list;
2386 i = alpha_elf_tdata(cur_got_obj)->got_link_next;
2387 while (i != NULL)
2389 if (elf64_alpha_can_merge_gots (cur_got_obj, i))
2391 elf64_alpha_merge_gots (cur_got_obj, i);
2393 alpha_elf_tdata(i)->got->size = 0;
2394 i = alpha_elf_tdata(i)->got_link_next;
2395 alpha_elf_tdata(cur_got_obj)->got_link_next = i;
2397 something_changed = 1;
2399 else
2401 cur_got_obj = i;
2402 i = alpha_elf_tdata(i)->got_link_next;
2406 /* Once the gots have been merged, fill in the got offsets for
2407 everything therein. */
2408 if (1 || something_changed)
2409 elf64_alpha_calc_got_offsets (info);
2411 return TRUE;
2414 static bfd_boolean
2415 elf64_alpha_size_plt_section_1 (struct alpha_elf_link_hash_entry *h, PTR data)
2417 asection *splt = (asection *) data;
2418 struct alpha_elf_got_entry *gotent;
2419 bfd_boolean saw_one = FALSE;
2421 /* If we didn't need an entry before, we still don't. */
2422 if (!h->root.needs_plt)
2423 return TRUE;
2425 /* For each LITERAL got entry still in use, allocate a plt entry. */
2426 for (gotent = h->got_entries; gotent ; gotent = gotent->next)
2427 if (gotent->reloc_type == R_ALPHA_LITERAL
2428 && gotent->use_count > 0)
2430 if (splt->size == 0)
2431 splt->size = PLT_HEADER_SIZE;
2432 gotent->plt_offset = splt->size;
2433 splt->size += PLT_ENTRY_SIZE;
2434 saw_one = TRUE;
2437 /* If there weren't any, there's no longer a need for the PLT entry. */
2438 if (!saw_one)
2439 h->root.needs_plt = FALSE;
2441 return TRUE;
2444 /* Called from relax_section to rebuild the PLT in light of
2445 potential changes in the function's status. */
2447 static bfd_boolean
2448 elf64_alpha_size_plt_section (struct bfd_link_info *info)
2450 asection *splt, *spltrel, *sgotplt;
2451 unsigned long entries;
2452 bfd *dynobj;
2454 dynobj = elf_hash_table(info)->dynobj;
2455 splt = bfd_get_section_by_name (dynobj, ".plt");
2456 if (splt == NULL)
2457 return TRUE;
2459 splt->size = 0;
2461 alpha_elf_link_hash_traverse (alpha_elf_hash_table (info),
2462 elf64_alpha_size_plt_section_1, splt);
2464 /* Every plt entry requires a JMP_SLOT relocation. */
2465 spltrel = bfd_get_section_by_name (dynobj, ".rela.plt");
2466 if (splt->size)
2468 if (elf64_alpha_use_secureplt)
2469 entries = (splt->size - NEW_PLT_HEADER_SIZE) / NEW_PLT_ENTRY_SIZE;
2470 else
2471 entries = (splt->size - OLD_PLT_HEADER_SIZE) / OLD_PLT_ENTRY_SIZE;
2473 else
2474 entries = 0;
2475 spltrel->size = entries * sizeof (Elf64_External_Rela);
2477 /* When using the secureplt, we need two words somewhere in the data
2478 segment for the dynamic linker to tell us where to go. This is the
2479 entire contents of the .got.plt section. */
2480 if (elf64_alpha_use_secureplt)
2482 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
2483 sgotplt->size = entries ? 16 : 0;
2486 return TRUE;
2489 static bfd_boolean
2490 elf64_alpha_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2491 struct bfd_link_info *info)
2493 bfd *i;
2495 if (info->relocatable)
2496 return TRUE;
2498 /* First, take care of the indirect symbols created by versioning. */
2499 alpha_elf_link_hash_traverse (alpha_elf_hash_table (info),
2500 elf64_alpha_merge_ind_symbols,
2501 NULL);
2503 if (!elf64_alpha_size_got_sections (info))
2504 return FALSE;
2506 /* Allocate space for all of the .got subsections. */
2507 i = alpha_elf_hash_table (info)->got_list;
2508 for ( ; i ; i = alpha_elf_tdata(i)->got_link_next)
2510 asection *s = alpha_elf_tdata(i)->got;
2511 if (s->size > 0)
2513 s->contents = (bfd_byte *) bfd_zalloc (i, s->size);
2514 if (s->contents == NULL)
2515 return FALSE;
2519 return TRUE;
2522 /* The number of dynamic relocations required by a static relocation. */
2524 static int
2525 alpha_dynamic_entries_for_reloc (int r_type, int dynamic, int shared)
2527 switch (r_type)
2529 /* May appear in GOT entries. */
2530 case R_ALPHA_TLSGD:
2531 return (dynamic ? 2 : shared ? 1 : 0);
2532 case R_ALPHA_TLSLDM:
2533 return shared;
2534 case R_ALPHA_LITERAL:
2535 case R_ALPHA_GOTTPREL:
2536 return dynamic || shared;
2537 case R_ALPHA_GOTDTPREL:
2538 return dynamic;
2540 /* May appear in data sections. */
2541 case R_ALPHA_REFLONG:
2542 case R_ALPHA_REFQUAD:
2543 case R_ALPHA_TPREL64:
2544 return dynamic || shared;
2546 /* Everything else is illegal. We'll issue an error during
2547 relocate_section. */
2548 default:
2549 return 0;
2553 /* Work out the sizes of the dynamic relocation entries. */
2555 static bfd_boolean
2556 elf64_alpha_calc_dynrel_sizes (struct alpha_elf_link_hash_entry *h,
2557 struct bfd_link_info *info)
2559 bfd_boolean dynamic;
2560 struct alpha_elf_reloc_entry *relent;
2561 unsigned long entries;
2563 if (h->root.root.type == bfd_link_hash_warning)
2564 h = (struct alpha_elf_link_hash_entry *) h->root.root.u.i.link;
2566 /* If the symbol was defined as a common symbol in a regular object
2567 file, and there was no definition in any dynamic object, then the
2568 linker will have allocated space for the symbol in a common
2569 section but the ELF_LINK_HASH_DEF_REGULAR flag will not have been
2570 set. This is done for dynamic symbols in
2571 elf_adjust_dynamic_symbol but this is not done for non-dynamic
2572 symbols, somehow. */
2573 if (!h->root.def_regular
2574 && h->root.ref_regular
2575 && !h->root.def_dynamic
2576 && (h->root.root.type == bfd_link_hash_defined
2577 || h->root.root.type == bfd_link_hash_defweak)
2578 && !(h->root.root.u.def.section->owner->flags & DYNAMIC))
2579 h->root.def_regular = 1;
2581 /* If the symbol is dynamic, we'll need all the relocations in their
2582 natural form. If this is a shared object, and it has been forced
2583 local, we'll need the same number of RELATIVE relocations. */
2584 dynamic = alpha_elf_dynamic_symbol_p (&h->root, info);
2586 /* If the symbol is a hidden undefined weak, then we never have any
2587 relocations. Avoid the loop which may want to add RELATIVE relocs
2588 based on info->shared. */
2589 if (h->root.root.type == bfd_link_hash_undefweak && !dynamic)
2590 return TRUE;
2592 for (relent = h->reloc_entries; relent; relent = relent->next)
2594 entries = alpha_dynamic_entries_for_reloc (relent->rtype, dynamic,
2595 info->shared);
2596 if (entries)
2598 relent->srel->size +=
2599 entries * sizeof (Elf64_External_Rela) * relent->count;
2600 if (relent->reltext)
2601 info->flags |= DT_TEXTREL;
2605 return TRUE;
2608 /* Subroutine of elf64_alpha_size_rela_got_section for doing the
2609 global symbols. */
2611 static bfd_boolean
2612 elf64_alpha_size_rela_got_1 (struct alpha_elf_link_hash_entry *h,
2613 struct bfd_link_info *info)
2615 bfd_boolean dynamic;
2616 struct alpha_elf_got_entry *gotent;
2617 unsigned long entries;
2619 if (h->root.root.type == bfd_link_hash_warning)
2620 h = (struct alpha_elf_link_hash_entry *) h->root.root.u.i.link;
2622 /* If we're using a plt for this symbol, then all of its relocations
2623 for its got entries go into .rela.plt. */
2624 if (h->root.needs_plt)
2625 return TRUE;
2627 /* If the symbol is dynamic, we'll need all the relocations in their
2628 natural form. If this is a shared object, and it has been forced
2629 local, we'll need the same number of RELATIVE relocations. */
2630 dynamic = alpha_elf_dynamic_symbol_p (&h->root, info);
2632 /* If the symbol is a hidden undefined weak, then we never have any
2633 relocations. Avoid the loop which may want to add RELATIVE relocs
2634 based on info->shared. */
2635 if (h->root.root.type == bfd_link_hash_undefweak && !dynamic)
2636 return TRUE;
2638 entries = 0;
2639 for (gotent = h->got_entries; gotent ; gotent = gotent->next)
2640 if (gotent->use_count > 0)
2641 entries += alpha_dynamic_entries_for_reloc (gotent->reloc_type,
2642 dynamic, info->shared);
2644 if (entries > 0)
2646 bfd *dynobj = elf_hash_table(info)->dynobj;
2647 asection *srel = bfd_get_section_by_name (dynobj, ".rela.got");
2648 BFD_ASSERT (srel != NULL);
2649 srel->size += sizeof (Elf64_External_Rela) * entries;
2652 return TRUE;
2655 /* Set the sizes of the dynamic relocation sections. */
2657 static bfd_boolean
2658 elf64_alpha_size_rela_got_section (struct bfd_link_info *info)
2660 unsigned long entries;
2661 bfd *i, *dynobj;
2662 asection *srel;
2664 /* Shared libraries often require RELATIVE relocs, and some relocs
2665 require attention for the main application as well. */
2667 entries = 0;
2668 for (i = alpha_elf_hash_table(info)->got_list;
2669 i ; i = alpha_elf_tdata(i)->got_link_next)
2671 bfd *j;
2673 for (j = i; j ; j = alpha_elf_tdata(j)->in_got_link_next)
2675 struct alpha_elf_got_entry **local_got_entries, *gotent;
2676 int k, n;
2678 local_got_entries = alpha_elf_tdata(j)->local_got_entries;
2679 if (!local_got_entries)
2680 continue;
2682 for (k = 0, n = elf_tdata(j)->symtab_hdr.sh_info; k < n; ++k)
2683 for (gotent = local_got_entries[k];
2684 gotent ; gotent = gotent->next)
2685 if (gotent->use_count > 0)
2686 entries += (alpha_dynamic_entries_for_reloc
2687 (gotent->reloc_type, 0, info->shared));
2691 dynobj = elf_hash_table(info)->dynobj;
2692 srel = bfd_get_section_by_name (dynobj, ".rela.got");
2693 if (!srel)
2695 BFD_ASSERT (entries == 0);
2696 return TRUE;
2698 srel->size = sizeof (Elf64_External_Rela) * entries;
2700 /* Now do the non-local symbols. */
2701 alpha_elf_link_hash_traverse (alpha_elf_hash_table (info),
2702 elf64_alpha_size_rela_got_1, info);
2704 return TRUE;
2707 /* Set the sizes of the dynamic sections. */
2709 static bfd_boolean
2710 elf64_alpha_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2711 struct bfd_link_info *info)
2713 bfd *dynobj;
2714 asection *s;
2715 bfd_boolean relplt;
2717 dynobj = elf_hash_table(info)->dynobj;
2718 BFD_ASSERT(dynobj != NULL);
2720 if (elf_hash_table (info)->dynamic_sections_created)
2722 /* Set the contents of the .interp section to the interpreter. */
2723 if (info->executable)
2725 s = bfd_get_section_by_name (dynobj, ".interp");
2726 BFD_ASSERT (s != NULL);
2727 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2728 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2731 /* Now that we've seen all of the input files, we can decide which
2732 symbols need dynamic relocation entries and which don't. We've
2733 collected information in check_relocs that we can now apply to
2734 size the dynamic relocation sections. */
2735 alpha_elf_link_hash_traverse (alpha_elf_hash_table (info),
2736 elf64_alpha_calc_dynrel_sizes, info);
2738 elf64_alpha_size_rela_got_section (info);
2739 elf64_alpha_size_plt_section (info);
2741 /* else we're not dynamic and by definition we don't need such things. */
2743 /* The check_relocs and adjust_dynamic_symbol entry points have
2744 determined the sizes of the various dynamic sections. Allocate
2745 memory for them. */
2746 relplt = FALSE;
2747 for (s = dynobj->sections; s != NULL; s = s->next)
2749 const char *name;
2751 if (!(s->flags & SEC_LINKER_CREATED))
2752 continue;
2754 /* It's OK to base decisions on the section name, because none
2755 of the dynobj section names depend upon the input files. */
2756 name = bfd_get_section_name (dynobj, s);
2758 if (strncmp (name, ".rela", 5) == 0)
2760 if (s->size != 0)
2762 if (strcmp (name, ".rela.plt") == 0)
2763 relplt = TRUE;
2765 /* We use the reloc_count field as a counter if we need
2766 to copy relocs into the output file. */
2767 s->reloc_count = 0;
2770 else if (strncmp (name, ".got", 4) != 0
2771 && strcmp (name, ".plt") != 0
2772 && strcmp (name, ".dynbss") != 0)
2774 /* It's not one of our dynamic sections, so don't allocate space. */
2775 continue;
2778 if (s->size == 0)
2780 /* If we don't need this section, strip it from the output file.
2781 This is to handle .rela.bss and .rela.plt. We must create it
2782 in create_dynamic_sections, because it must be created before
2783 the linker maps input sections to output sections. The
2784 linker does that before adjust_dynamic_symbol is called, and
2785 it is that function which decides whether anything needs to
2786 go into these sections. */
2787 s->flags |= SEC_EXCLUDE;
2789 else if ((s->flags & SEC_HAS_CONTENTS) != 0)
2791 /* Allocate memory for the section contents. */
2792 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
2793 if (s->contents == NULL)
2794 return FALSE;
2798 if (elf_hash_table (info)->dynamic_sections_created)
2800 /* Add some entries to the .dynamic section. We fill in the
2801 values later, in elf64_alpha_finish_dynamic_sections, but we
2802 must add the entries now so that we get the correct size for
2803 the .dynamic section. The DT_DEBUG entry is filled in by the
2804 dynamic linker and used by the debugger. */
2805 #define add_dynamic_entry(TAG, VAL) \
2806 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2808 if (info->executable)
2810 if (!add_dynamic_entry (DT_DEBUG, 0))
2811 return FALSE;
2814 if (relplt)
2816 if (!add_dynamic_entry (DT_PLTGOT, 0)
2817 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2818 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
2819 || !add_dynamic_entry (DT_JMPREL, 0))
2820 return FALSE;
2822 if (elf64_alpha_use_secureplt
2823 && !add_dynamic_entry (DT_ALPHA_PLTRO, 1))
2824 return FALSE;
2827 if (!add_dynamic_entry (DT_RELA, 0)
2828 || !add_dynamic_entry (DT_RELASZ, 0)
2829 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
2830 return FALSE;
2832 if (info->flags & DF_TEXTREL)
2834 if (!add_dynamic_entry (DT_TEXTREL, 0))
2835 return FALSE;
2838 #undef add_dynamic_entry
2840 return TRUE;
2843 /* These functions do relaxation for Alpha ELF.
2845 Currently I'm only handling what I can do with existing compiler
2846 and assembler support, which means no instructions are removed,
2847 though some may be nopped. At this time GCC does not emit enough
2848 information to do all of the relaxing that is possible. It will
2849 take some not small amount of work for that to happen.
2851 There are a couple of interesting papers that I once read on this
2852 subject, that I cannot find references to at the moment, that
2853 related to Alpha in particular. They are by David Wall, then of
2854 DEC WRL. */
2856 struct alpha_relax_info
2858 bfd *abfd;
2859 asection *sec;
2860 bfd_byte *contents;
2861 Elf_Internal_Shdr *symtab_hdr;
2862 Elf_Internal_Rela *relocs, *relend;
2863 struct bfd_link_info *link_info;
2864 bfd_vma gp;
2865 bfd *gotobj;
2866 asection *tsec;
2867 struct alpha_elf_link_hash_entry *h;
2868 struct alpha_elf_got_entry **first_gotent;
2869 struct alpha_elf_got_entry *gotent;
2870 bfd_boolean changed_contents;
2871 bfd_boolean changed_relocs;
2872 unsigned char other;
2875 static Elf_Internal_Rela *
2876 elf64_alpha_find_reloc_at_ofs (Elf_Internal_Rela *rel,
2877 Elf_Internal_Rela *relend,
2878 bfd_vma offset, int type)
2880 while (rel < relend)
2882 if (rel->r_offset == offset
2883 && ELF64_R_TYPE (rel->r_info) == (unsigned int) type)
2884 return rel;
2885 ++rel;
2887 return NULL;
2890 static bfd_boolean
2891 elf64_alpha_relax_got_load (struct alpha_relax_info *info, bfd_vma symval,
2892 Elf_Internal_Rela *irel, unsigned long r_type)
2894 unsigned int insn;
2895 bfd_signed_vma disp;
2897 /* Get the instruction. */
2898 insn = bfd_get_32 (info->abfd, info->contents + irel->r_offset);
2900 if (insn >> 26 != OP_LDQ)
2902 reloc_howto_type *howto = elf64_alpha_howto_table + r_type;
2903 ((*_bfd_error_handler)
2904 ("%B: %A+0x%lx: warning: %s relocation against unexpected insn",
2905 info->abfd, info->sec,
2906 (unsigned long) irel->r_offset, howto->name));
2907 return TRUE;
2910 /* Can't relax dynamic symbols. */
2911 if (alpha_elf_dynamic_symbol_p (&info->h->root, info->link_info))
2912 return TRUE;
2914 /* Can't use local-exec relocations in shared libraries. */
2915 if (r_type == R_ALPHA_GOTTPREL && info->link_info->shared)
2916 return TRUE;
2918 if (r_type == R_ALPHA_LITERAL)
2920 /* Look for nice constant addresses. This includes the not-uncommon
2921 special case of 0 for undefweak symbols. */
2922 if ((info->h && info->h->root.root.type == bfd_link_hash_undefweak)
2923 || (!info->link_info->shared
2924 && (symval >= (bfd_vma)-0x8000 || symval < 0x8000)))
2926 disp = 0;
2927 insn = (OP_LDA << 26) | (insn & (31 << 21)) | (31 << 16);
2928 insn |= (symval & 0xffff);
2929 r_type = R_ALPHA_NONE;
2931 else
2933 disp = symval - info->gp;
2934 insn = (OP_LDA << 26) | (insn & 0x03ff0000);
2935 r_type = R_ALPHA_GPREL16;
2938 else
2940 bfd_vma dtp_base, tp_base;
2942 BFD_ASSERT (elf_hash_table (info->link_info)->tls_sec != NULL);
2943 dtp_base = alpha_get_dtprel_base (info->link_info);
2944 tp_base = alpha_get_tprel_base (info->link_info);
2945 disp = symval - (r_type == R_ALPHA_GOTDTPREL ? dtp_base : tp_base);
2947 insn = (OP_LDA << 26) | (insn & (31 << 21)) | (31 << 16);
2949 switch (r_type)
2951 case R_ALPHA_GOTDTPREL:
2952 r_type = R_ALPHA_DTPREL16;
2953 break;
2954 case R_ALPHA_GOTTPREL:
2955 r_type = R_ALPHA_TPREL16;
2956 break;
2957 default:
2958 BFD_ASSERT (0);
2959 return FALSE;
2963 if (disp < -0x8000 || disp >= 0x8000)
2964 return TRUE;
2966 bfd_put_32 (info->abfd, (bfd_vma) insn, info->contents + irel->r_offset);
2967 info->changed_contents = TRUE;
2969 /* Reduce the use count on this got entry by one, possibly
2970 eliminating it. */
2971 if (--info->gotent->use_count == 0)
2973 int sz = alpha_got_entry_size (r_type);
2974 alpha_elf_tdata (info->gotobj)->total_got_size -= sz;
2975 if (!info->h)
2976 alpha_elf_tdata (info->gotobj)->local_got_size -= sz;
2979 /* Smash the existing GOT relocation for its 16-bit immediate pair. */
2980 irel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info), r_type);
2981 info->changed_relocs = TRUE;
2983 /* ??? Search forward through this basic block looking for insns
2984 that use the target register. Stop after an insn modifying the
2985 register is seen, or after a branch or call.
2987 Any such memory load insn may be substituted by a load directly
2988 off the GP. This allows the memory load insn to be issued before
2989 the calculated GP register would otherwise be ready.
2991 Any such jsr insn can be replaced by a bsr if it is in range.
2993 This would mean that we'd have to _add_ relocations, the pain of
2994 which gives one pause. */
2996 return TRUE;
2999 static bfd_vma
3000 elf64_alpha_relax_opt_call (struct alpha_relax_info *info, bfd_vma symval)
3002 /* If the function has the same gp, and we can identify that the
3003 function does not use its function pointer, we can eliminate the
3004 address load. */
3006 /* If the symbol is marked NOPV, we are being told the function never
3007 needs its procedure value. */
3008 if ((info->other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_NOPV)
3009 return symval;
3011 /* If the symbol is marked STD_GP, we are being told the function does
3012 a normal ldgp in the first two words. */
3013 else if ((info->other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_STD_GPLOAD)
3016 /* Otherwise, we may be able to identify a GP load in the first two
3017 words, which we can then skip. */
3018 else
3020 Elf_Internal_Rela *tsec_relocs, *tsec_relend, *tsec_free, *gpdisp;
3021 bfd_vma ofs;
3023 /* Load the relocations from the section that the target symbol is in. */
3024 if (info->sec == info->tsec)
3026 tsec_relocs = info->relocs;
3027 tsec_relend = info->relend;
3028 tsec_free = NULL;
3030 else
3032 tsec_relocs = (_bfd_elf_link_read_relocs
3033 (info->abfd, info->tsec, (PTR) NULL,
3034 (Elf_Internal_Rela *) NULL,
3035 info->link_info->keep_memory));
3036 if (tsec_relocs == NULL)
3037 return 0;
3038 tsec_relend = tsec_relocs + info->tsec->reloc_count;
3039 tsec_free = (info->link_info->keep_memory ? NULL : tsec_relocs);
3042 /* Recover the symbol's offset within the section. */
3043 ofs = (symval - info->tsec->output_section->vma
3044 - info->tsec->output_offset);
3046 /* Look for a GPDISP reloc. */
3047 gpdisp = (elf64_alpha_find_reloc_at_ofs
3048 (tsec_relocs, tsec_relend, ofs, R_ALPHA_GPDISP));
3050 if (!gpdisp || gpdisp->r_addend != 4)
3052 if (tsec_free)
3053 free (tsec_free);
3054 return 0;
3056 if (tsec_free)
3057 free (tsec_free);
3060 /* We've now determined that we can skip an initial gp load. Verify
3061 that the call and the target use the same gp. */
3062 if (info->link_info->hash->creator != info->tsec->owner->xvec
3063 || info->gotobj != alpha_elf_tdata (info->tsec->owner)->gotobj)
3064 return 0;
3066 return symval + 8;
3069 static bfd_boolean
3070 elf64_alpha_relax_with_lituse (struct alpha_relax_info *info,
3071 bfd_vma symval, Elf_Internal_Rela *irel)
3073 Elf_Internal_Rela *urel, *irelend = info->relend;
3074 int flags, count, i;
3075 bfd_signed_vma disp;
3076 bfd_boolean fits16;
3077 bfd_boolean fits32;
3078 bfd_boolean lit_reused = FALSE;
3079 bfd_boolean all_optimized = TRUE;
3080 unsigned int lit_insn;
3082 lit_insn = bfd_get_32 (info->abfd, info->contents + irel->r_offset);
3083 if (lit_insn >> 26 != OP_LDQ)
3085 ((*_bfd_error_handler)
3086 ("%B: %A+0x%lx: warning: LITERAL relocation against unexpected insn",
3087 info->abfd, info->sec,
3088 (unsigned long) irel->r_offset));
3089 return TRUE;
3092 /* Can't relax dynamic symbols. */
3093 if (alpha_elf_dynamic_symbol_p (&info->h->root, info->link_info))
3094 return TRUE;
3096 /* Summarize how this particular LITERAL is used. */
3097 for (urel = irel+1, flags = count = 0; urel < irelend; ++urel, ++count)
3099 if (ELF64_R_TYPE (urel->r_info) != R_ALPHA_LITUSE)
3100 break;
3101 if (urel->r_addend <= 6)
3102 flags |= 1 << urel->r_addend;
3105 /* A little preparation for the loop... */
3106 disp = symval - info->gp;
3108 for (urel = irel+1, i = 0; i < count; ++i, ++urel)
3110 unsigned int insn;
3111 int insn_disp;
3112 bfd_signed_vma xdisp;
3114 insn = bfd_get_32 (info->abfd, info->contents + urel->r_offset);
3116 switch (urel->r_addend)
3118 case LITUSE_ALPHA_ADDR:
3119 default:
3120 /* This type is really just a placeholder to note that all
3121 uses cannot be optimized, but to still allow some. */
3122 all_optimized = FALSE;
3123 break;
3125 case LITUSE_ALPHA_BASE:
3126 /* We can always optimize 16-bit displacements. */
3128 /* Extract the displacement from the instruction, sign-extending
3129 it if necessary, then test whether it is within 16 or 32 bits
3130 displacement from GP. */
3131 insn_disp = ((insn & 0xffff) ^ 0x8000) - 0x8000;
3133 xdisp = disp + insn_disp;
3134 fits16 = (xdisp >= - (bfd_signed_vma) 0x8000 && xdisp < 0x8000);
3135 fits32 = (xdisp >= - (bfd_signed_vma) 0x80000000
3136 && xdisp < 0x7fff8000);
3138 if (fits16)
3140 /* Take the op code and dest from this insn, take the base
3141 register from the literal insn. Leave the offset alone. */
3142 insn = (insn & 0xffe0ffff) | (lit_insn & 0x001f0000);
3143 urel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info),
3144 R_ALPHA_GPREL16);
3145 urel->r_addend = irel->r_addend;
3146 info->changed_relocs = TRUE;
3148 bfd_put_32 (info->abfd, (bfd_vma) insn,
3149 info->contents + urel->r_offset);
3150 info->changed_contents = TRUE;
3153 /* If all mem+byte, we can optimize 32-bit mem displacements. */
3154 else if (fits32 && !(flags & ~6))
3156 /* FIXME: sanity check that lit insn Ra is mem insn Rb. */
3158 irel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info),
3159 R_ALPHA_GPRELHIGH);
3160 lit_insn = (OP_LDAH << 26) | (lit_insn & 0x03ff0000);
3161 bfd_put_32 (info->abfd, (bfd_vma) lit_insn,
3162 info->contents + irel->r_offset);
3163 lit_reused = TRUE;
3164 info->changed_contents = TRUE;
3166 urel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info),
3167 R_ALPHA_GPRELLOW);
3168 urel->r_addend = irel->r_addend;
3169 info->changed_relocs = TRUE;
3171 else
3172 all_optimized = FALSE;
3173 break;
3175 case LITUSE_ALPHA_BYTOFF:
3176 /* We can always optimize byte instructions. */
3178 /* FIXME: sanity check the insn for byte op. Check that the
3179 literal dest reg is indeed Rb in the byte insn. */
3181 insn &= ~ (unsigned) 0x001ff000;
3182 insn |= ((symval & 7) << 13) | 0x1000;
3184 urel->r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
3185 urel->r_addend = 0;
3186 info->changed_relocs = TRUE;
3188 bfd_put_32 (info->abfd, (bfd_vma) insn,
3189 info->contents + urel->r_offset);
3190 info->changed_contents = TRUE;
3191 break;
3193 case LITUSE_ALPHA_JSR:
3194 case LITUSE_ALPHA_TLSGD:
3195 case LITUSE_ALPHA_TLSLDM:
3196 case LITUSE_ALPHA_JSRDIRECT:
3198 bfd_vma optdest, org;
3199 bfd_signed_vma odisp;
3201 /* For undefined weak symbols, we're mostly interested in getting
3202 rid of the got entry whenever possible, so optimize this to a
3203 use of the zero register. */
3204 if (info->h && info->h->root.root.type == bfd_link_hash_undefweak)
3206 insn |= 31 << 16;
3207 bfd_put_32 (info->abfd, (bfd_vma) insn,
3208 info->contents + urel->r_offset);
3210 info->changed_contents = TRUE;
3211 break;
3214 /* If not zero, place to jump without needing pv. */
3215 optdest = elf64_alpha_relax_opt_call (info, symval);
3216 org = (info->sec->output_section->vma
3217 + info->sec->output_offset
3218 + urel->r_offset + 4);
3219 odisp = (optdest ? optdest : symval) - org;
3221 if (odisp >= -0x400000 && odisp < 0x400000)
3223 Elf_Internal_Rela *xrel;
3225 /* Preserve branch prediction call stack when possible. */
3226 if ((insn & INSN_JSR_MASK) == INSN_JSR)
3227 insn = (OP_BSR << 26) | (insn & 0x03e00000);
3228 else
3229 insn = (OP_BR << 26) | (insn & 0x03e00000);
3231 urel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info),
3232 R_ALPHA_BRADDR);
3233 urel->r_addend = irel->r_addend;
3235 if (optdest)
3236 urel->r_addend += optdest - symval;
3237 else
3238 all_optimized = FALSE;
3240 bfd_put_32 (info->abfd, (bfd_vma) insn,
3241 info->contents + urel->r_offset);
3243 /* Kill any HINT reloc that might exist for this insn. */
3244 xrel = (elf64_alpha_find_reloc_at_ofs
3245 (info->relocs, info->relend, urel->r_offset,
3246 R_ALPHA_HINT));
3247 if (xrel)
3248 xrel->r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
3250 info->changed_contents = TRUE;
3251 info->changed_relocs = TRUE;
3253 else
3254 all_optimized = FALSE;
3256 /* Even if the target is not in range for a direct branch,
3257 if we share a GP, we can eliminate the gp reload. */
3258 if (optdest)
3260 Elf_Internal_Rela *gpdisp
3261 = (elf64_alpha_find_reloc_at_ofs
3262 (info->relocs, irelend, urel->r_offset + 4,
3263 R_ALPHA_GPDISP));
3264 if (gpdisp)
3266 bfd_byte *p_ldah = info->contents + gpdisp->r_offset;
3267 bfd_byte *p_lda = p_ldah + gpdisp->r_addend;
3268 unsigned int ldah = bfd_get_32 (info->abfd, p_ldah);
3269 unsigned int lda = bfd_get_32 (info->abfd, p_lda);
3271 /* Verify that the instruction is "ldah $29,0($26)".
3272 Consider a function that ends in a noreturn call,
3273 and that the next function begins with an ldgp,
3274 and that by accident there is no padding between.
3275 In that case the insn would use $27 as the base. */
3276 if (ldah == 0x27ba0000 && lda == 0x23bd0000)
3278 bfd_put_32 (info->abfd, (bfd_vma) INSN_UNOP, p_ldah);
3279 bfd_put_32 (info->abfd, (bfd_vma) INSN_UNOP, p_lda);
3281 gpdisp->r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
3282 info->changed_contents = TRUE;
3283 info->changed_relocs = TRUE;
3288 break;
3292 /* If all cases were optimized, we can reduce the use count on this
3293 got entry by one, possibly eliminating it. */
3294 if (all_optimized)
3296 if (--info->gotent->use_count == 0)
3298 int sz = alpha_got_entry_size (R_ALPHA_LITERAL);
3299 alpha_elf_tdata (info->gotobj)->total_got_size -= sz;
3300 if (!info->h)
3301 alpha_elf_tdata (info->gotobj)->local_got_size -= sz;
3304 /* If the literal instruction is no longer needed (it may have been
3305 reused. We can eliminate it. */
3306 /* ??? For now, I don't want to deal with compacting the section,
3307 so just nop it out. */
3308 if (!lit_reused)
3310 irel->r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
3311 info->changed_relocs = TRUE;
3313 bfd_put_32 (info->abfd, (bfd_vma) INSN_UNOP,
3314 info->contents + irel->r_offset);
3315 info->changed_contents = TRUE;
3318 return TRUE;
3320 else
3321 return elf64_alpha_relax_got_load (info, symval, irel, R_ALPHA_LITERAL);
3324 static bfd_boolean
3325 elf64_alpha_relax_tls_get_addr (struct alpha_relax_info *info, bfd_vma symval,
3326 Elf_Internal_Rela *irel, bfd_boolean is_gd)
3328 bfd_byte *pos[5];
3329 unsigned int insn;
3330 Elf_Internal_Rela *gpdisp, *hint;
3331 bfd_boolean dynamic, use_gottprel, pos1_unusable;
3332 unsigned long new_symndx;
3334 dynamic = alpha_elf_dynamic_symbol_p (&info->h->root, info->link_info);
3336 /* If a TLS symbol is accessed using IE at least once, there is no point
3337 to use dynamic model for it. */
3338 if (is_gd && info->h && (info->h->flags & ALPHA_ELF_LINK_HASH_TLS_IE))
3341 /* If the symbol is local, and we've already committed to DF_STATIC_TLS,
3342 then we might as well relax to IE. */
3343 else if (info->link_info->shared && !dynamic
3344 && (info->link_info->flags & DF_STATIC_TLS))
3347 /* Otherwise we must be building an executable to do anything. */
3348 else if (info->link_info->shared)
3349 return TRUE;
3351 /* The TLSGD/TLSLDM relocation must be followed by a LITERAL and
3352 the matching LITUSE_TLS relocations. */
3353 if (irel + 2 >= info->relend)
3354 return TRUE;
3355 if (ELF64_R_TYPE (irel[1].r_info) != R_ALPHA_LITERAL
3356 || ELF64_R_TYPE (irel[2].r_info) != R_ALPHA_LITUSE
3357 || irel[2].r_addend != (is_gd ? LITUSE_ALPHA_TLSGD : LITUSE_ALPHA_TLSLDM))
3358 return TRUE;
3360 /* There must be a GPDISP relocation positioned immediately after the
3361 LITUSE relocation. */
3362 gpdisp = elf64_alpha_find_reloc_at_ofs (info->relocs, info->relend,
3363 irel[2].r_offset + 4, R_ALPHA_GPDISP);
3364 if (!gpdisp)
3365 return TRUE;
3367 pos[0] = info->contents + irel[0].r_offset;
3368 pos[1] = info->contents + irel[1].r_offset;
3369 pos[2] = info->contents + irel[2].r_offset;
3370 pos[3] = info->contents + gpdisp->r_offset;
3371 pos[4] = pos[3] + gpdisp->r_addend;
3372 pos1_unusable = FALSE;
3374 /* Generally, the positions are not allowed to be out of order, lest the
3375 modified insn sequence have different register lifetimes. We can make
3376 an exception when pos 1 is adjacent to pos 0. */
3377 if (pos[1] + 4 == pos[0])
3379 bfd_byte *tmp = pos[0];
3380 pos[0] = pos[1];
3381 pos[1] = tmp;
3383 else if (pos[1] < pos[0])
3384 pos1_unusable = TRUE;
3385 if (pos[1] >= pos[2] || pos[2] >= pos[3])
3386 return TRUE;
3388 /* Reduce the use count on the LITERAL relocation. Do this before we
3389 smash the symndx when we adjust the relocations below. */
3391 struct alpha_elf_got_entry *lit_gotent;
3392 struct alpha_elf_link_hash_entry *lit_h;
3393 unsigned long indx;
3395 BFD_ASSERT (ELF64_R_SYM (irel[1].r_info) >= info->symtab_hdr->sh_info);
3396 indx = ELF64_R_SYM (irel[1].r_info) - info->symtab_hdr->sh_info;
3397 lit_h = alpha_elf_sym_hashes (info->abfd)[indx];
3399 while (lit_h->root.root.type == bfd_link_hash_indirect
3400 || lit_h->root.root.type == bfd_link_hash_warning)
3401 lit_h = (struct alpha_elf_link_hash_entry *) lit_h->root.root.u.i.link;
3403 for (lit_gotent = lit_h->got_entries; lit_gotent ;
3404 lit_gotent = lit_gotent->next)
3405 if (lit_gotent->gotobj == info->gotobj
3406 && lit_gotent->reloc_type == R_ALPHA_LITERAL
3407 && lit_gotent->addend == irel[1].r_addend)
3408 break;
3409 BFD_ASSERT (lit_gotent);
3411 if (--lit_gotent->use_count == 0)
3413 int sz = alpha_got_entry_size (R_ALPHA_LITERAL);
3414 alpha_elf_tdata (info->gotobj)->total_got_size -= sz;
3418 /* Change
3420 lda $16,x($gp) !tlsgd!1
3421 ldq $27,__tls_get_addr($gp) !literal!1
3422 jsr $26,($27),__tls_get_addr !lituse_tlsgd!1
3423 ldah $29,0($26) !gpdisp!2
3424 lda $29,0($29) !gpdisp!2
3426 ldq $16,x($gp) !gottprel
3427 unop
3428 call_pal rduniq
3429 addq $16,$0,$0
3430 unop
3431 or the first pair to
3432 lda $16,x($gp) !tprel
3433 unop
3435 ldah $16,x($gp) !tprelhi
3436 lda $16,x($16) !tprello
3438 as appropriate. */
3440 use_gottprel = FALSE;
3441 new_symndx = is_gd ? ELF64_R_SYM (irel->r_info) : 0;
3442 switch (!dynamic && !info->link_info->shared)
3444 case 1:
3446 bfd_vma tp_base;
3447 bfd_signed_vma disp;
3449 BFD_ASSERT (elf_hash_table (info->link_info)->tls_sec != NULL);
3450 tp_base = alpha_get_tprel_base (info->link_info);
3451 disp = symval - tp_base;
3453 if (disp >= -0x8000 && disp < 0x8000)
3455 insn = (OP_LDA << 26) | (16 << 21) | (31 << 16);
3456 bfd_put_32 (info->abfd, (bfd_vma) insn, pos[0]);
3457 bfd_put_32 (info->abfd, (bfd_vma) INSN_UNOP, pos[1]);
3459 irel[0].r_offset = pos[0] - info->contents;
3460 irel[0].r_info = ELF64_R_INFO (new_symndx, R_ALPHA_TPREL16);
3461 irel[1].r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
3462 break;
3464 else if (disp >= -(bfd_signed_vma) 0x80000000
3465 && disp < (bfd_signed_vma) 0x7fff8000
3466 && !pos1_unusable)
3468 insn = (OP_LDAH << 26) | (16 << 21) | (31 << 16);
3469 bfd_put_32 (info->abfd, (bfd_vma) insn, pos[0]);
3470 insn = (OP_LDA << 26) | (16 << 21) | (16 << 16);
3471 bfd_put_32 (info->abfd, (bfd_vma) insn, pos[1]);
3473 irel[0].r_offset = pos[0] - info->contents;
3474 irel[0].r_info = ELF64_R_INFO (new_symndx, R_ALPHA_TPRELHI);
3475 irel[1].r_offset = pos[1] - info->contents;
3476 irel[1].r_info = ELF64_R_INFO (new_symndx, R_ALPHA_TPRELLO);
3477 break;
3480 /* FALLTHRU */
3482 default:
3483 use_gottprel = TRUE;
3485 insn = (OP_LDQ << 26) | (16 << 21) | (29 << 16);
3486 bfd_put_32 (info->abfd, (bfd_vma) insn, pos[0]);
3487 bfd_put_32 (info->abfd, (bfd_vma) INSN_UNOP, pos[1]);
3489 irel[0].r_offset = pos[0] - info->contents;
3490 irel[0].r_info = ELF64_R_INFO (new_symndx, R_ALPHA_GOTTPREL);
3491 irel[1].r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
3492 break;
3495 bfd_put_32 (info->abfd, (bfd_vma) INSN_RDUNIQ, pos[2]);
3497 insn = INSN_ADDQ | (16 << 21) | (0 << 16) | (0 << 0);
3498 bfd_put_32 (info->abfd, (bfd_vma) insn, pos[3]);
3500 bfd_put_32 (info->abfd, (bfd_vma) INSN_UNOP, pos[4]);
3502 irel[2].r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
3503 gpdisp->r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
3505 hint = elf64_alpha_find_reloc_at_ofs (info->relocs, info->relend,
3506 irel[2].r_offset, R_ALPHA_HINT);
3507 if (hint)
3508 hint->r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
3510 info->changed_contents = TRUE;
3511 info->changed_relocs = TRUE;
3513 /* Reduce the use count on the TLSGD/TLSLDM relocation. */
3514 if (--info->gotent->use_count == 0)
3516 int sz = alpha_got_entry_size (info->gotent->reloc_type);
3517 alpha_elf_tdata (info->gotobj)->total_got_size -= sz;
3518 if (!info->h)
3519 alpha_elf_tdata (info->gotobj)->local_got_size -= sz;
3522 /* If we've switched to a GOTTPREL relocation, increment the reference
3523 count on that got entry. */
3524 if (use_gottprel)
3526 struct alpha_elf_got_entry *tprel_gotent;
3528 for (tprel_gotent = *info->first_gotent; tprel_gotent ;
3529 tprel_gotent = tprel_gotent->next)
3530 if (tprel_gotent->gotobj == info->gotobj
3531 && tprel_gotent->reloc_type == R_ALPHA_GOTTPREL
3532 && tprel_gotent->addend == irel->r_addend)
3533 break;
3534 if (tprel_gotent)
3535 tprel_gotent->use_count++;
3536 else
3538 if (info->gotent->use_count == 0)
3539 tprel_gotent = info->gotent;
3540 else
3542 tprel_gotent = (struct alpha_elf_got_entry *)
3543 bfd_alloc (info->abfd, sizeof (struct alpha_elf_got_entry));
3544 if (!tprel_gotent)
3545 return FALSE;
3547 tprel_gotent->next = *info->first_gotent;
3548 *info->first_gotent = tprel_gotent;
3550 tprel_gotent->gotobj = info->gotobj;
3551 tprel_gotent->addend = irel->r_addend;
3552 tprel_gotent->got_offset = -1;
3553 tprel_gotent->reloc_done = 0;
3554 tprel_gotent->reloc_xlated = 0;
3557 tprel_gotent->use_count = 1;
3558 tprel_gotent->reloc_type = R_ALPHA_GOTTPREL;
3562 return TRUE;
3565 static bfd_boolean
3566 elf64_alpha_relax_section (bfd *abfd, asection *sec,
3567 struct bfd_link_info *link_info, bfd_boolean *again)
3569 Elf_Internal_Shdr *symtab_hdr;
3570 Elf_Internal_Rela *internal_relocs;
3571 Elf_Internal_Rela *irel, *irelend;
3572 Elf_Internal_Sym *isymbuf = NULL;
3573 struct alpha_elf_got_entry **local_got_entries;
3574 struct alpha_relax_info info;
3576 /* We are not currently changing any sizes, so only one pass. */
3577 *again = FALSE;
3579 if (link_info->relocatable
3580 || ((sec->flags & (SEC_CODE | SEC_RELOC | SEC_ALLOC))
3581 != (SEC_CODE | SEC_RELOC | SEC_ALLOC))
3582 || sec->reloc_count == 0)
3583 return TRUE;
3585 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3586 local_got_entries = alpha_elf_tdata(abfd)->local_got_entries;
3588 /* Load the relocations for this section. */
3589 internal_relocs = (_bfd_elf_link_read_relocs
3590 (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
3591 link_info->keep_memory));
3592 if (internal_relocs == NULL)
3593 return FALSE;
3595 memset(&info, 0, sizeof (info));
3596 info.abfd = abfd;
3597 info.sec = sec;
3598 info.link_info = link_info;
3599 info.symtab_hdr = symtab_hdr;
3600 info.relocs = internal_relocs;
3601 info.relend = irelend = internal_relocs + sec->reloc_count;
3603 /* Find the GP for this object. Do not store the result back via
3604 _bfd_set_gp_value, since this could change again before final. */
3605 info.gotobj = alpha_elf_tdata (abfd)->gotobj;
3606 if (info.gotobj)
3608 asection *sgot = alpha_elf_tdata (info.gotobj)->got;
3609 info.gp = (sgot->output_section->vma
3610 + sgot->output_offset
3611 + 0x8000);
3614 /* Get the section contents. */
3615 if (elf_section_data (sec)->this_hdr.contents != NULL)
3616 info.contents = elf_section_data (sec)->this_hdr.contents;
3617 else
3619 if (!bfd_malloc_and_get_section (abfd, sec, &info.contents))
3620 goto error_return;
3623 for (irel = internal_relocs; irel < irelend; irel++)
3625 bfd_vma symval;
3626 struct alpha_elf_got_entry *gotent;
3627 unsigned long r_type = ELF64_R_TYPE (irel->r_info);
3628 unsigned long r_symndx = ELF64_R_SYM (irel->r_info);
3630 /* Early exit for unhandled or unrelaxable relocations. */
3631 switch (r_type)
3633 case R_ALPHA_LITERAL:
3634 case R_ALPHA_GPRELHIGH:
3635 case R_ALPHA_GPRELLOW:
3636 case R_ALPHA_GOTDTPREL:
3637 case R_ALPHA_GOTTPREL:
3638 case R_ALPHA_TLSGD:
3639 break;
3641 case R_ALPHA_TLSLDM:
3642 /* The symbol for a TLSLDM reloc is ignored. Collapse the
3643 reloc to the 0 symbol so that they all match. */
3644 r_symndx = 0;
3645 break;
3647 default:
3648 continue;
3651 /* Get the value of the symbol referred to by the reloc. */
3652 if (r_symndx < symtab_hdr->sh_info)
3654 /* A local symbol. */
3655 Elf_Internal_Sym *isym;
3657 /* Read this BFD's local symbols. */
3658 if (isymbuf == NULL)
3660 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
3661 if (isymbuf == NULL)
3662 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
3663 symtab_hdr->sh_info, 0,
3664 NULL, NULL, NULL);
3665 if (isymbuf == NULL)
3666 goto error_return;
3669 isym = isymbuf + r_symndx;
3671 /* Given the symbol for a TLSLDM reloc is ignored, this also
3672 means forcing the symbol value to the tp base. */
3673 if (r_type == R_ALPHA_TLSLDM)
3675 info.tsec = bfd_abs_section_ptr;
3676 symval = alpha_get_tprel_base (info.link_info);
3678 else
3680 symval = isym->st_value;
3681 if (isym->st_shndx == SHN_UNDEF)
3682 continue;
3683 else if (isym->st_shndx == SHN_ABS)
3684 info.tsec = bfd_abs_section_ptr;
3685 else if (isym->st_shndx == SHN_COMMON)
3686 info.tsec = bfd_com_section_ptr;
3687 else
3688 info.tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3691 info.h = NULL;
3692 info.other = isym->st_other;
3693 if (local_got_entries)
3694 info.first_gotent = &local_got_entries[r_symndx];
3695 else
3697 info.first_gotent = &info.gotent;
3698 info.gotent = NULL;
3701 else
3703 unsigned long indx;
3704 struct alpha_elf_link_hash_entry *h;
3706 indx = r_symndx - symtab_hdr->sh_info;
3707 h = alpha_elf_sym_hashes (abfd)[indx];
3708 BFD_ASSERT (h != NULL);
3710 while (h->root.root.type == bfd_link_hash_indirect
3711 || h->root.root.type == bfd_link_hash_warning)
3712 h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link;
3714 /* If the symbol is undefined, we can't do anything with it. */
3715 if (h->root.root.type == bfd_link_hash_undefined)
3716 continue;
3718 /* If the symbol isn't defined in the current module,
3719 again we can't do anything. */
3720 if (h->root.root.type == bfd_link_hash_undefweak)
3722 info.tsec = bfd_abs_section_ptr;
3723 symval = 0;
3725 else if (!h->root.def_regular)
3727 /* Except for TLSGD relocs, which can sometimes be
3728 relaxed to GOTTPREL relocs. */
3729 if (r_type != R_ALPHA_TLSGD)
3730 continue;
3731 info.tsec = bfd_abs_section_ptr;
3732 symval = 0;
3734 else
3736 info.tsec = h->root.root.u.def.section;
3737 symval = h->root.root.u.def.value;
3740 info.h = h;
3741 info.other = h->root.other;
3742 info.first_gotent = &h->got_entries;
3745 /* Search for the got entry to be used by this relocation. */
3746 for (gotent = *info.first_gotent; gotent ; gotent = gotent->next)
3747 if (gotent->gotobj == info.gotobj
3748 && gotent->reloc_type == r_type
3749 && gotent->addend == irel->r_addend)
3750 break;
3751 info.gotent = gotent;
3753 symval += info.tsec->output_section->vma + info.tsec->output_offset;
3754 symval += irel->r_addend;
3756 switch (r_type)
3758 case R_ALPHA_LITERAL:
3759 BFD_ASSERT(info.gotent != NULL);
3761 /* If there exist LITUSE relocations immediately following, this
3762 opens up all sorts of interesting optimizations, because we
3763 now know every location that this address load is used. */
3764 if (irel+1 < irelend
3765 && ELF64_R_TYPE (irel[1].r_info) == R_ALPHA_LITUSE)
3767 if (!elf64_alpha_relax_with_lituse (&info, symval, irel))
3768 goto error_return;
3770 else
3772 if (!elf64_alpha_relax_got_load (&info, symval, irel, r_type))
3773 goto error_return;
3775 break;
3777 case R_ALPHA_GOTDTPREL:
3778 case R_ALPHA_GOTTPREL:
3779 BFD_ASSERT(info.gotent != NULL);
3780 if (!elf64_alpha_relax_got_load (&info, symval, irel, r_type))
3781 goto error_return;
3782 break;
3784 case R_ALPHA_TLSGD:
3785 case R_ALPHA_TLSLDM:
3786 BFD_ASSERT(info.gotent != NULL);
3787 if (!elf64_alpha_relax_tls_get_addr (&info, symval, irel,
3788 r_type == R_ALPHA_TLSGD))
3789 goto error_return;
3790 break;
3794 if (!elf64_alpha_size_plt_section (link_info))
3795 return FALSE;
3796 if (!elf64_alpha_size_got_sections (link_info))
3797 return FALSE;
3798 if (!elf64_alpha_size_rela_got_section (link_info))
3799 return FALSE;
3801 if (isymbuf != NULL
3802 && symtab_hdr->contents != (unsigned char *) isymbuf)
3804 if (!link_info->keep_memory)
3805 free (isymbuf);
3806 else
3808 /* Cache the symbols for elf_link_input_bfd. */
3809 symtab_hdr->contents = (unsigned char *) isymbuf;
3813 if (info.contents != NULL
3814 && elf_section_data (sec)->this_hdr.contents != info.contents)
3816 if (!info.changed_contents && !link_info->keep_memory)
3817 free (info.contents);
3818 else
3820 /* Cache the section contents for elf_link_input_bfd. */
3821 elf_section_data (sec)->this_hdr.contents = info.contents;
3825 if (elf_section_data (sec)->relocs != internal_relocs)
3827 if (!info.changed_relocs)
3828 free (internal_relocs);
3829 else
3830 elf_section_data (sec)->relocs = internal_relocs;
3833 *again = info.changed_contents || info.changed_relocs;
3835 return TRUE;
3837 error_return:
3838 if (isymbuf != NULL
3839 && symtab_hdr->contents != (unsigned char *) isymbuf)
3840 free (isymbuf);
3841 if (info.contents != NULL
3842 && elf_section_data (sec)->this_hdr.contents != info.contents)
3843 free (info.contents);
3844 if (internal_relocs != NULL
3845 && elf_section_data (sec)->relocs != internal_relocs)
3846 free (internal_relocs);
3847 return FALSE;
3850 /* Emit a dynamic relocation for (DYNINDX, RTYPE, ADDEND) at (SEC, OFFSET)
3851 into the next available slot in SREL. */
3853 static void
3854 elf64_alpha_emit_dynrel (bfd *abfd, struct bfd_link_info *info,
3855 asection *sec, asection *srel, bfd_vma offset,
3856 long dynindx, long rtype, bfd_vma addend)
3858 Elf_Internal_Rela outrel;
3859 bfd_byte *loc;
3861 BFD_ASSERT (srel != NULL);
3863 outrel.r_info = ELF64_R_INFO (dynindx, rtype);
3864 outrel.r_addend = addend;
3866 offset = _bfd_elf_section_offset (abfd, info, sec, offset);
3867 if ((offset | 1) != (bfd_vma) -1)
3868 outrel.r_offset = sec->output_section->vma + sec->output_offset + offset;
3869 else
3870 memset (&outrel, 0, sizeof (outrel));
3872 loc = srel->contents;
3873 loc += srel->reloc_count++ * sizeof (Elf64_External_Rela);
3874 bfd_elf64_swap_reloca_out (abfd, &outrel, loc);
3875 BFD_ASSERT (sizeof (Elf64_External_Rela) * srel->reloc_count <= srel->size);
3878 /* Relocate an Alpha ELF section for a relocatable link.
3880 We don't have to change anything unless the reloc is against a section
3881 symbol, in which case we have to adjust according to where the section
3882 symbol winds up in the output section. */
3884 static bfd_boolean
3885 elf64_alpha_relocate_section_r (bfd *output_bfd ATTRIBUTE_UNUSED,
3886 struct bfd_link_info *info ATTRIBUTE_UNUSED,
3887 bfd *input_bfd, asection *input_section,
3888 bfd_byte *contents ATTRIBUTE_UNUSED,
3889 Elf_Internal_Rela *relocs,
3890 Elf_Internal_Sym *local_syms,
3891 asection **local_sections)
3893 unsigned long symtab_hdr_sh_info;
3894 Elf_Internal_Rela *rel;
3895 Elf_Internal_Rela *relend;
3896 bfd_boolean ret_val = TRUE;
3898 symtab_hdr_sh_info = elf_tdata (input_bfd)->symtab_hdr.sh_info;
3900 relend = relocs + input_section->reloc_count;
3901 for (rel = relocs; rel < relend; rel++)
3903 unsigned long r_symndx;
3904 Elf_Internal_Sym *sym;
3905 asection *sec;
3906 unsigned long r_type;
3908 r_type = ELF64_R_TYPE(rel->r_info);
3909 if (r_type >= R_ALPHA_max)
3911 (*_bfd_error_handler)
3912 (_("%B: unknown relocation type %d"),
3913 input_bfd, (int) r_type);
3914 bfd_set_error (bfd_error_bad_value);
3915 ret_val = FALSE;
3916 continue;
3919 r_symndx = ELF64_R_SYM(rel->r_info);
3921 /* The symbol associated with GPDISP and LITUSE is
3922 immaterial. Only the addend is significant. */
3923 if (r_type == R_ALPHA_GPDISP || r_type == R_ALPHA_LITUSE)
3924 continue;
3926 if (r_symndx < symtab_hdr_sh_info)
3928 sym = local_syms + r_symndx;
3929 if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
3931 sec = local_sections[r_symndx];
3932 rel->r_addend += sec->output_offset + sym->st_value;
3937 return ret_val;
3940 /* Relocate an Alpha ELF section. */
3942 static bfd_boolean
3943 elf64_alpha_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
3944 bfd *input_bfd, asection *input_section,
3945 bfd_byte *contents, Elf_Internal_Rela *relocs,
3946 Elf_Internal_Sym *local_syms,
3947 asection **local_sections)
3949 Elf_Internal_Shdr *symtab_hdr;
3950 Elf_Internal_Rela *rel;
3951 Elf_Internal_Rela *relend;
3952 asection *sgot, *srel, *srelgot;
3953 bfd *dynobj, *gotobj;
3954 bfd_vma gp, tp_base, dtp_base;
3955 struct alpha_elf_got_entry **local_got_entries;
3956 bfd_boolean ret_val;
3958 /* Handle relocatable links with a smaller loop. */
3959 if (info->relocatable)
3960 return elf64_alpha_relocate_section_r (output_bfd, info, input_bfd,
3961 input_section, contents, relocs,
3962 local_syms, local_sections);
3964 /* This is a final link. */
3966 ret_val = TRUE;
3968 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
3970 dynobj = elf_hash_table (info)->dynobj;
3971 if (dynobj)
3972 srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
3973 else
3974 srelgot = NULL;
3976 if (input_section->flags & SEC_ALLOC)
3978 const char *section_name;
3979 section_name = (bfd_elf_string_from_elf_section
3980 (input_bfd, elf_elfheader(input_bfd)->e_shstrndx,
3981 elf_section_data(input_section)->rel_hdr.sh_name));
3982 BFD_ASSERT(section_name != NULL);
3983 srel = bfd_get_section_by_name (dynobj, section_name);
3985 else
3986 srel = NULL;
3988 /* Find the gp value for this input bfd. */
3989 gotobj = alpha_elf_tdata (input_bfd)->gotobj;
3990 if (gotobj)
3992 sgot = alpha_elf_tdata (gotobj)->got;
3993 gp = _bfd_get_gp_value (gotobj);
3994 if (gp == 0)
3996 gp = (sgot->output_section->vma
3997 + sgot->output_offset
3998 + 0x8000);
3999 _bfd_set_gp_value (gotobj, gp);
4002 else
4004 sgot = NULL;
4005 gp = 0;
4008 local_got_entries = alpha_elf_tdata(input_bfd)->local_got_entries;
4010 if (elf_hash_table (info)->tls_sec != NULL)
4012 dtp_base = alpha_get_dtprel_base (info);
4013 tp_base = alpha_get_tprel_base (info);
4015 else
4016 dtp_base = tp_base = 0;
4018 relend = relocs + input_section->reloc_count;
4019 for (rel = relocs; rel < relend; rel++)
4021 struct alpha_elf_link_hash_entry *h = NULL;
4022 struct alpha_elf_got_entry *gotent;
4023 bfd_reloc_status_type r;
4024 reloc_howto_type *howto;
4025 unsigned long r_symndx;
4026 Elf_Internal_Sym *sym = NULL;
4027 asection *sec = NULL;
4028 bfd_vma value;
4029 bfd_vma addend;
4030 bfd_boolean dynamic_symbol_p;
4031 bfd_boolean undef_weak_ref = FALSE;
4032 unsigned long r_type;
4034 r_type = ELF64_R_TYPE(rel->r_info);
4035 if (r_type >= R_ALPHA_max)
4037 (*_bfd_error_handler)
4038 (_("%B: unknown relocation type %d"),
4039 input_bfd, (int) r_type);
4040 bfd_set_error (bfd_error_bad_value);
4041 ret_val = FALSE;
4042 continue;
4045 howto = elf64_alpha_howto_table + r_type;
4046 r_symndx = ELF64_R_SYM(rel->r_info);
4048 /* The symbol for a TLSLDM reloc is ignored. Collapse the
4049 reloc to the 0 symbol so that they all match. */
4050 if (r_type == R_ALPHA_TLSLDM)
4051 r_symndx = 0;
4053 if (r_symndx < symtab_hdr->sh_info)
4055 asection *msec;
4056 sym = local_syms + r_symndx;
4057 sec = local_sections[r_symndx];
4058 msec = sec;
4059 value = _bfd_elf_rela_local_sym (output_bfd, sym, &msec, rel);
4061 /* If this is a tp-relative relocation against sym 0,
4062 this is hackery from relax_section. Force the value to
4063 be the tls module base. */
4064 if (r_symndx == 0
4065 && (r_type == R_ALPHA_TLSLDM
4066 || r_type == R_ALPHA_GOTTPREL
4067 || r_type == R_ALPHA_TPREL64
4068 || r_type == R_ALPHA_TPRELHI
4069 || r_type == R_ALPHA_TPRELLO
4070 || r_type == R_ALPHA_TPREL16))
4071 value = dtp_base;
4073 if (local_got_entries)
4074 gotent = local_got_entries[r_symndx];
4075 else
4076 gotent = NULL;
4078 /* Need to adjust local GOT entries' addends for SEC_MERGE
4079 unless it has been done already. */
4080 if ((sec->flags & SEC_MERGE)
4081 && ELF_ST_TYPE (sym->st_info) == STT_SECTION
4082 && sec->sec_info_type == ELF_INFO_TYPE_MERGE
4083 && gotent
4084 && !gotent->reloc_xlated)
4086 struct alpha_elf_got_entry *ent;
4088 for (ent = gotent; ent; ent = ent->next)
4090 ent->reloc_xlated = 1;
4091 if (ent->use_count == 0)
4092 continue;
4093 msec = sec;
4094 ent->addend =
4095 _bfd_merged_section_offset (output_bfd, &msec,
4096 elf_section_data (sec)->
4097 sec_info,
4098 sym->st_value + ent->addend);
4099 ent->addend -= sym->st_value;
4100 ent->addend += msec->output_section->vma
4101 + msec->output_offset
4102 - sec->output_section->vma
4103 - sec->output_offset;
4107 dynamic_symbol_p = FALSE;
4109 else
4111 bfd_boolean warned;
4112 bfd_boolean unresolved_reloc;
4113 struct elf_link_hash_entry *hh;
4114 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
4116 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
4117 r_symndx, symtab_hdr, sym_hashes,
4118 hh, sec, value,
4119 unresolved_reloc, warned);
4121 if (warned)
4122 continue;
4124 if (value == 0
4125 && ! unresolved_reloc
4126 && hh->root.type == bfd_link_hash_undefweak)
4127 undef_weak_ref = TRUE;
4129 h = (struct alpha_elf_link_hash_entry *) hh;
4130 dynamic_symbol_p = alpha_elf_dynamic_symbol_p (&h->root, info);
4131 gotent = h->got_entries;
4134 addend = rel->r_addend;
4135 value += addend;
4137 /* Search for the proper got entry. */
4138 for (; gotent ; gotent = gotent->next)
4139 if (gotent->gotobj == gotobj
4140 && gotent->reloc_type == r_type
4141 && gotent->addend == addend)
4142 break;
4144 switch (r_type)
4146 case R_ALPHA_GPDISP:
4148 bfd_byte *p_ldah, *p_lda;
4150 BFD_ASSERT(gp != 0);
4152 value = (input_section->output_section->vma
4153 + input_section->output_offset
4154 + rel->r_offset);
4156 p_ldah = contents + rel->r_offset;
4157 p_lda = p_ldah + rel->r_addend;
4159 r = elf64_alpha_do_reloc_gpdisp (input_bfd, gp - value,
4160 p_ldah, p_lda);
4162 break;
4164 case R_ALPHA_LITERAL:
4165 BFD_ASSERT(sgot != NULL);
4166 BFD_ASSERT(gp != 0);
4167 BFD_ASSERT(gotent != NULL);
4168 BFD_ASSERT(gotent->use_count >= 1);
4170 if (!gotent->reloc_done)
4172 gotent->reloc_done = 1;
4174 bfd_put_64 (output_bfd, value,
4175 sgot->contents + gotent->got_offset);
4177 /* If the symbol has been forced local, output a
4178 RELATIVE reloc, otherwise it will be handled in
4179 finish_dynamic_symbol. */
4180 if (info->shared && !dynamic_symbol_p && !undef_weak_ref)
4181 elf64_alpha_emit_dynrel (output_bfd, info, sgot, srelgot,
4182 gotent->got_offset, 0,
4183 R_ALPHA_RELATIVE, value);
4186 value = (sgot->output_section->vma
4187 + sgot->output_offset
4188 + gotent->got_offset);
4189 value -= gp;
4190 goto default_reloc;
4192 case R_ALPHA_GPREL32:
4193 /* If the target section was a removed linkonce section,
4194 r_symndx will be zero. In this case, assume that the
4195 switch will not be used, so don't fill it in. If we
4196 do nothing here, we'll get relocation truncated messages,
4197 due to the placement of the application above 4GB. */
4198 if (r_symndx == 0)
4200 r = bfd_reloc_ok;
4201 break;
4203 /* FALLTHRU */
4205 case R_ALPHA_GPREL16:
4206 case R_ALPHA_GPRELLOW:
4207 if (dynamic_symbol_p)
4209 (*_bfd_error_handler)
4210 (_("%B: gp-relative relocation against dynamic symbol %s"),
4211 input_bfd, h->root.root.root.string);
4212 ret_val = FALSE;
4214 BFD_ASSERT(gp != 0);
4215 value -= gp;
4216 goto default_reloc;
4218 case R_ALPHA_GPRELHIGH:
4219 if (dynamic_symbol_p)
4221 (*_bfd_error_handler)
4222 (_("%B: gp-relative relocation against dynamic symbol %s"),
4223 input_bfd, h->root.root.root.string);
4224 ret_val = FALSE;
4226 BFD_ASSERT(gp != 0);
4227 value -= gp;
4228 value = ((bfd_signed_vma) value >> 16) + ((value >> 15) & 1);
4229 goto default_reloc;
4231 case R_ALPHA_HINT:
4232 /* A call to a dynamic symbol is definitely out of range of
4233 the 16-bit displacement. Don't bother writing anything. */
4234 if (dynamic_symbol_p)
4236 r = bfd_reloc_ok;
4237 break;
4239 /* The regular PC-relative stuff measures from the start of
4240 the instruction rather than the end. */
4241 value -= 4;
4242 goto default_reloc;
4244 case R_ALPHA_BRADDR:
4245 if (dynamic_symbol_p)
4247 (*_bfd_error_handler)
4248 (_("%B: pc-relative relocation against dynamic symbol %s"),
4249 input_bfd, h->root.root.root.string);
4250 ret_val = FALSE;
4252 /* The regular PC-relative stuff measures from the start of
4253 the instruction rather than the end. */
4254 value -= 4;
4255 goto default_reloc;
4257 case R_ALPHA_BRSGP:
4259 int other;
4260 const char *name;
4262 /* The regular PC-relative stuff measures from the start of
4263 the instruction rather than the end. */
4264 value -= 4;
4266 /* The source and destination gp must be the same. Note that
4267 the source will always have an assigned gp, since we forced
4268 one in check_relocs, but that the destination may not, as
4269 it might not have had any relocations at all. Also take
4270 care not to crash if H is an undefined symbol. */
4271 if (h != NULL && sec != NULL
4272 && alpha_elf_tdata (sec->owner)->gotobj
4273 && gotobj != alpha_elf_tdata (sec->owner)->gotobj)
4275 (*_bfd_error_handler)
4276 (_("%B: change in gp: BRSGP %s"),
4277 input_bfd, h->root.root.root.string);
4278 ret_val = FALSE;
4281 /* The symbol should be marked either NOPV or STD_GPLOAD. */
4282 if (h != NULL)
4283 other = h->root.other;
4284 else
4285 other = sym->st_other;
4286 switch (other & STO_ALPHA_STD_GPLOAD)
4288 case STO_ALPHA_NOPV:
4289 break;
4290 case STO_ALPHA_STD_GPLOAD:
4291 value += 8;
4292 break;
4293 default:
4294 if (h != NULL)
4295 name = h->root.root.root.string;
4296 else
4298 name = (bfd_elf_string_from_elf_section
4299 (input_bfd, symtab_hdr->sh_link, sym->st_name));
4300 if (name == NULL)
4301 name = _("<unknown>");
4302 else if (name[0] == 0)
4303 name = bfd_section_name (input_bfd, sec);
4305 (*_bfd_error_handler)
4306 (_("%B: !samegp reloc against symbol without .prologue: %s"),
4307 input_bfd, name);
4308 ret_val = FALSE;
4309 break;
4312 goto default_reloc;
4315 case R_ALPHA_REFLONG:
4316 case R_ALPHA_REFQUAD:
4317 case R_ALPHA_DTPREL64:
4318 case R_ALPHA_TPREL64:
4320 long dynindx, dyntype = r_type;
4321 bfd_vma dynaddend;
4323 /* Careful here to remember RELATIVE relocations for global
4324 variables for symbolic shared objects. */
4326 if (dynamic_symbol_p)
4328 BFD_ASSERT(h->root.dynindx != -1);
4329 dynindx = h->root.dynindx;
4330 dynaddend = addend;
4331 addend = 0, value = 0;
4333 else if (r_type == R_ALPHA_DTPREL64)
4335 BFD_ASSERT (elf_hash_table (info)->tls_sec != NULL);
4336 value -= dtp_base;
4337 goto default_reloc;
4339 else if (r_type == R_ALPHA_TPREL64)
4341 BFD_ASSERT (elf_hash_table (info)->tls_sec != NULL);
4342 if (!info->shared)
4344 value -= tp_base;
4345 goto default_reloc;
4347 dynindx = 0;
4348 dynaddend = value - dtp_base;
4350 else if (info->shared
4351 && r_symndx != 0
4352 && (input_section->flags & SEC_ALLOC)
4353 && !undef_weak_ref)
4355 if (r_type == R_ALPHA_REFLONG)
4357 (*_bfd_error_handler)
4358 (_("%B: unhandled dynamic relocation against %s"),
4359 input_bfd,
4360 h->root.root.root.string);
4361 ret_val = FALSE;
4363 dynindx = 0;
4364 dyntype = R_ALPHA_RELATIVE;
4365 dynaddend = value;
4367 else
4368 goto default_reloc;
4370 if (input_section->flags & SEC_ALLOC)
4371 elf64_alpha_emit_dynrel (output_bfd, info, input_section,
4372 srel, rel->r_offset, dynindx,
4373 dyntype, dynaddend);
4375 goto default_reloc;
4377 case R_ALPHA_SREL16:
4378 case R_ALPHA_SREL32:
4379 case R_ALPHA_SREL64:
4380 if (dynamic_symbol_p)
4382 (*_bfd_error_handler)
4383 (_("%B: pc-relative relocation against dynamic symbol %s"),
4384 input_bfd, h->root.root.root.string);
4385 ret_val = FALSE;
4387 else if ((info->shared || info->pie) && undef_weak_ref)
4389 (*_bfd_error_handler)
4390 (_("%B: pc-relative relocation against undefined weak symbol %s"),
4391 input_bfd, h->root.root.root.string);
4392 ret_val = FALSE;
4396 /* ??? .eh_frame references to discarded sections will be smashed
4397 to relocations against SHN_UNDEF. The .eh_frame format allows
4398 NULL to be encoded as 0 in any format, so this works here. */
4399 if (r_symndx == 0)
4400 howto = (elf64_alpha_howto_table
4401 + (r_type - R_ALPHA_SREL32 + R_ALPHA_REFLONG));
4402 goto default_reloc;
4404 case R_ALPHA_TLSLDM:
4405 /* Ignore the symbol for the relocation. The result is always
4406 the current module. */
4407 dynamic_symbol_p = 0;
4408 /* FALLTHRU */
4410 case R_ALPHA_TLSGD:
4411 if (!gotent->reloc_done)
4413 gotent->reloc_done = 1;
4415 /* Note that the module index for the main program is 1. */
4416 bfd_put_64 (output_bfd, !info->shared && !dynamic_symbol_p,
4417 sgot->contents + gotent->got_offset);
4419 /* If the symbol has been forced local, output a
4420 DTPMOD64 reloc, otherwise it will be handled in
4421 finish_dynamic_symbol. */
4422 if (info->shared && !dynamic_symbol_p)
4423 elf64_alpha_emit_dynrel (output_bfd, info, sgot, srelgot,
4424 gotent->got_offset, 0,
4425 R_ALPHA_DTPMOD64, 0);
4427 if (dynamic_symbol_p || r_type == R_ALPHA_TLSLDM)
4428 value = 0;
4429 else
4431 BFD_ASSERT (elf_hash_table (info)->tls_sec != NULL);
4432 value -= dtp_base;
4434 bfd_put_64 (output_bfd, value,
4435 sgot->contents + gotent->got_offset + 8);
4438 value = (sgot->output_section->vma
4439 + sgot->output_offset
4440 + gotent->got_offset);
4441 value -= gp;
4442 goto default_reloc;
4444 case R_ALPHA_DTPRELHI:
4445 case R_ALPHA_DTPRELLO:
4446 case R_ALPHA_DTPREL16:
4447 if (dynamic_symbol_p)
4449 (*_bfd_error_handler)
4450 (_("%B: dtp-relative relocation against dynamic symbol %s"),
4451 input_bfd, h->root.root.root.string);
4452 ret_val = FALSE;
4454 BFD_ASSERT (elf_hash_table (info)->tls_sec != NULL);
4455 value -= dtp_base;
4456 if (r_type == R_ALPHA_DTPRELHI)
4457 value = ((bfd_signed_vma) value >> 16) + ((value >> 15) & 1);
4458 goto default_reloc;
4460 case R_ALPHA_TPRELHI:
4461 case R_ALPHA_TPRELLO:
4462 case R_ALPHA_TPREL16:
4463 if (info->shared)
4465 (*_bfd_error_handler)
4466 (_("%B: TLS local exec code cannot be linked into shared objects"),
4467 input_bfd);
4468 ret_val = FALSE;
4470 else if (dynamic_symbol_p)
4472 (*_bfd_error_handler)
4473 (_("%B: tp-relative relocation against dynamic symbol %s"),
4474 input_bfd, h->root.root.root.string);
4475 ret_val = FALSE;
4477 BFD_ASSERT (elf_hash_table (info)->tls_sec != NULL);
4478 value -= tp_base;
4479 if (r_type == R_ALPHA_TPRELHI)
4480 value = ((bfd_signed_vma) value >> 16) + ((value >> 15) & 1);
4481 goto default_reloc;
4483 case R_ALPHA_GOTDTPREL:
4484 case R_ALPHA_GOTTPREL:
4485 BFD_ASSERT(sgot != NULL);
4486 BFD_ASSERT(gp != 0);
4487 BFD_ASSERT(gotent != NULL);
4488 BFD_ASSERT(gotent->use_count >= 1);
4490 if (!gotent->reloc_done)
4492 gotent->reloc_done = 1;
4494 if (dynamic_symbol_p)
4495 value = 0;
4496 else
4498 BFD_ASSERT (elf_hash_table (info)->tls_sec != NULL);
4499 if (r_type == R_ALPHA_GOTDTPREL)
4500 value -= dtp_base;
4501 else if (!info->shared)
4502 value -= tp_base;
4503 else
4505 elf64_alpha_emit_dynrel (output_bfd, info, sgot, srelgot,
4506 gotent->got_offset, 0,
4507 R_ALPHA_TPREL64,
4508 value - dtp_base);
4509 value = 0;
4512 bfd_put_64 (output_bfd, value,
4513 sgot->contents + gotent->got_offset);
4516 value = (sgot->output_section->vma
4517 + sgot->output_offset
4518 + gotent->got_offset);
4519 value -= gp;
4520 goto default_reloc;
4522 default:
4523 default_reloc:
4524 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4525 contents, rel->r_offset, value, 0);
4526 break;
4529 switch (r)
4531 case bfd_reloc_ok:
4532 break;
4534 case bfd_reloc_overflow:
4536 const char *name;
4538 /* Don't warn if the overflow is due to pc relative reloc
4539 against discarded section. Section optimization code should
4540 handle it. */
4542 if (r_symndx < symtab_hdr->sh_info
4543 && sec != NULL && howto->pc_relative
4544 && elf_discarded_section (sec))
4545 break;
4547 if (h != NULL)
4548 name = NULL;
4549 else
4551 name = (bfd_elf_string_from_elf_section
4552 (input_bfd, symtab_hdr->sh_link, sym->st_name));
4553 if (name == NULL)
4554 return FALSE;
4555 if (*name == '\0')
4556 name = bfd_section_name (input_bfd, sec);
4558 if (! ((*info->callbacks->reloc_overflow)
4559 (info, (h ? &h->root.root : NULL), name, howto->name,
4560 (bfd_vma) 0, input_bfd, input_section,
4561 rel->r_offset)))
4562 ret_val = FALSE;
4564 break;
4566 default:
4567 case bfd_reloc_outofrange:
4568 abort ();
4572 return ret_val;
4575 /* Finish up dynamic symbol handling. We set the contents of various
4576 dynamic sections here. */
4578 static bfd_boolean
4579 elf64_alpha_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info,
4580 struct elf_link_hash_entry *h,
4581 Elf_Internal_Sym *sym)
4583 struct alpha_elf_link_hash_entry *ah = (struct alpha_elf_link_hash_entry *)h;
4584 bfd *dynobj = elf_hash_table(info)->dynobj;
4586 if (h->needs_plt)
4588 /* Fill in the .plt entry for this symbol. */
4589 asection *splt, *sgot, *srel;
4590 Elf_Internal_Rela outrel;
4591 bfd_byte *loc;
4592 bfd_vma got_addr, plt_addr;
4593 bfd_vma plt_index;
4594 struct alpha_elf_got_entry *gotent;
4596 BFD_ASSERT (h->dynindx != -1);
4598 splt = bfd_get_section_by_name (dynobj, ".plt");
4599 BFD_ASSERT (splt != NULL);
4600 srel = bfd_get_section_by_name (dynobj, ".rela.plt");
4601 BFD_ASSERT (srel != NULL);
4603 for (gotent = ah->got_entries; gotent ; gotent = gotent->next)
4604 if (gotent->reloc_type == R_ALPHA_LITERAL
4605 && gotent->use_count > 0)
4607 unsigned int insn;
4608 int disp;
4610 sgot = alpha_elf_tdata (gotent->gotobj)->got;
4611 BFD_ASSERT (sgot != NULL);
4613 BFD_ASSERT (gotent->got_offset != -1);
4614 BFD_ASSERT (gotent->plt_offset != -1);
4616 got_addr = (sgot->output_section->vma
4617 + sgot->output_offset
4618 + gotent->got_offset);
4619 plt_addr = (splt->output_section->vma
4620 + splt->output_offset
4621 + gotent->plt_offset);
4623 plt_index = (gotent->plt_offset-PLT_HEADER_SIZE) / PLT_ENTRY_SIZE;
4625 /* Fill in the entry in the procedure linkage table. */
4626 if (elf64_alpha_use_secureplt)
4628 disp = (PLT_HEADER_SIZE - 4) - (gotent->plt_offset + 4);
4629 insn = INSN_AD (INSN_BR, 31, disp);
4630 bfd_put_32 (output_bfd, insn,
4631 splt->contents + gotent->plt_offset);
4633 plt_index = ((gotent->plt_offset - NEW_PLT_HEADER_SIZE)
4634 / NEW_PLT_ENTRY_SIZE);
4636 else
4638 disp = -(gotent->plt_offset + 4);
4639 insn = INSN_AD (INSN_BR, 28, disp);
4640 bfd_put_32 (output_bfd, insn,
4641 splt->contents + gotent->plt_offset);
4642 bfd_put_32 (output_bfd, INSN_UNOP,
4643 splt->contents + gotent->plt_offset + 4);
4644 bfd_put_32 (output_bfd, INSN_UNOP,
4645 splt->contents + gotent->plt_offset + 8);
4647 plt_index = ((gotent->plt_offset - OLD_PLT_HEADER_SIZE)
4648 / OLD_PLT_ENTRY_SIZE);
4651 /* Fill in the entry in the .rela.plt section. */
4652 outrel.r_offset = got_addr;
4653 outrel.r_info = ELF64_R_INFO(h->dynindx, R_ALPHA_JMP_SLOT);
4654 outrel.r_addend = 0;
4656 loc = srel->contents + plt_index * sizeof (Elf64_External_Rela);
4657 bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
4659 /* Fill in the entry in the .got. */
4660 bfd_put_64 (output_bfd, plt_addr,
4661 sgot->contents + gotent->got_offset);
4664 else if (alpha_elf_dynamic_symbol_p (h, info))
4666 /* Fill in the dynamic relocations for this symbol's .got entries. */
4667 asection *srel;
4668 struct alpha_elf_got_entry *gotent;
4670 srel = bfd_get_section_by_name (dynobj, ".rela.got");
4671 BFD_ASSERT (srel != NULL);
4673 for (gotent = ((struct alpha_elf_link_hash_entry *) h)->got_entries;
4674 gotent != NULL;
4675 gotent = gotent->next)
4677 asection *sgot;
4678 long r_type;
4680 if (gotent->use_count == 0)
4681 continue;
4683 sgot = alpha_elf_tdata (gotent->gotobj)->got;
4685 r_type = gotent->reloc_type;
4686 switch (r_type)
4688 case R_ALPHA_LITERAL:
4689 r_type = R_ALPHA_GLOB_DAT;
4690 break;
4691 case R_ALPHA_TLSGD:
4692 r_type = R_ALPHA_DTPMOD64;
4693 break;
4694 case R_ALPHA_GOTDTPREL:
4695 r_type = R_ALPHA_DTPREL64;
4696 break;
4697 case R_ALPHA_GOTTPREL:
4698 r_type = R_ALPHA_TPREL64;
4699 break;
4700 case R_ALPHA_TLSLDM:
4701 default:
4702 abort ();
4705 elf64_alpha_emit_dynrel (output_bfd, info, sgot, srel,
4706 gotent->got_offset, h->dynindx,
4707 r_type, gotent->addend);
4709 if (gotent->reloc_type == R_ALPHA_TLSGD)
4710 elf64_alpha_emit_dynrel (output_bfd, info, sgot, srel,
4711 gotent->got_offset + 8, h->dynindx,
4712 R_ALPHA_DTPREL64, gotent->addend);
4716 /* Mark some specially defined symbols as absolute. */
4717 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
4718 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
4719 || strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
4720 sym->st_shndx = SHN_ABS;
4722 return TRUE;
4725 /* Finish up the dynamic sections. */
4727 static bfd_boolean
4728 elf64_alpha_finish_dynamic_sections (bfd *output_bfd,
4729 struct bfd_link_info *info)
4731 bfd *dynobj;
4732 asection *sdyn;
4734 dynobj = elf_hash_table (info)->dynobj;
4735 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4737 if (elf_hash_table (info)->dynamic_sections_created)
4739 asection *splt, *sgotplt, *srelaplt;
4740 Elf64_External_Dyn *dyncon, *dynconend;
4741 bfd_vma plt_vma, gotplt_vma;
4743 splt = bfd_get_section_by_name (dynobj, ".plt");
4744 srelaplt = bfd_get_section_by_name (output_bfd, ".rela.plt");
4745 BFD_ASSERT (splt != NULL && sdyn != NULL);
4747 plt_vma = splt->output_section->vma + splt->output_offset;
4749 gotplt_vma = 0;
4750 if (elf64_alpha_use_secureplt)
4752 sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
4753 BFD_ASSERT (sgotplt != NULL);
4754 if (sgotplt->size > 0)
4755 gotplt_vma = sgotplt->output_section->vma + sgotplt->output_offset;
4758 dyncon = (Elf64_External_Dyn *) sdyn->contents;
4759 dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
4760 for (; dyncon < dynconend; dyncon++)
4762 Elf_Internal_Dyn dyn;
4764 bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
4766 switch (dyn.d_tag)
4768 case DT_PLTGOT:
4769 dyn.d_un.d_ptr
4770 = elf64_alpha_use_secureplt ? gotplt_vma : plt_vma;
4771 break;
4772 case DT_PLTRELSZ:
4773 dyn.d_un.d_val = srelaplt ? srelaplt->size : 0;
4774 break;
4775 case DT_JMPREL:
4776 dyn.d_un.d_ptr = srelaplt ? srelaplt->vma : 0;
4777 break;
4779 case DT_RELASZ:
4780 /* My interpretation of the TIS v1.1 ELF document indicates
4781 that RELASZ should not include JMPREL. This is not what
4782 the rest of the BFD does. It is, however, what the
4783 glibc ld.so wants. Do this fixup here until we found
4784 out who is right. */
4785 if (srelaplt)
4786 dyn.d_un.d_val -= srelaplt->size;
4787 break;
4790 bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
4793 /* Initialize the plt header. */
4794 if (splt->size > 0)
4796 unsigned int insn;
4797 int ofs;
4799 if (elf64_alpha_use_secureplt)
4801 ofs = gotplt_vma - (plt_vma + PLT_HEADER_SIZE);
4803 insn = INSN_ABC (INSN_SUBQ, 27, 28, 25);
4804 bfd_put_32 (output_bfd, insn, splt->contents);
4806 insn = INSN_ABO (INSN_LDAH, 28, 28, (ofs + 0x8000) >> 16);
4807 bfd_put_32 (output_bfd, insn, splt->contents + 4);
4809 insn = INSN_ABC (INSN_S4SUBQ, 25, 25, 25);
4810 bfd_put_32 (output_bfd, insn, splt->contents + 8);
4812 insn = INSN_ABO (INSN_LDA, 28, 28, ofs);
4813 bfd_put_32 (output_bfd, insn, splt->contents + 12);
4815 insn = INSN_ABO (INSN_LDQ, 27, 28, 0);
4816 bfd_put_32 (output_bfd, insn, splt->contents + 16);
4818 insn = INSN_ABC (INSN_ADDQ, 25, 25, 25);
4819 bfd_put_32 (output_bfd, insn, splt->contents + 20);
4821 insn = INSN_ABO (INSN_LDQ, 28, 28, 8);
4822 bfd_put_32 (output_bfd, insn, splt->contents + 24);
4824 insn = INSN_AB (INSN_JMP, 31, 27);
4825 bfd_put_32 (output_bfd, insn, splt->contents + 28);
4827 insn = INSN_AD (INSN_BR, 28, -PLT_HEADER_SIZE);
4828 bfd_put_32 (output_bfd, insn, splt->contents + 32);
4830 else
4832 insn = INSN_AD (INSN_BR, 27, 0); /* br $27, .+4 */
4833 bfd_put_32 (output_bfd, insn, splt->contents);
4835 insn = INSN_ABO (INSN_LDQ, 27, 27, 12);
4836 bfd_put_32 (output_bfd, insn, splt->contents + 4);
4838 insn = INSN_UNOP;
4839 bfd_put_32 (output_bfd, insn, splt->contents + 8);
4841 insn = INSN_AB (INSN_JMP, 27, 27);
4842 bfd_put_32 (output_bfd, insn, splt->contents + 12);
4844 /* The next two words will be filled in by ld.so. */
4845 bfd_put_64 (output_bfd, 0, splt->contents + 16);
4846 bfd_put_64 (output_bfd, 0, splt->contents + 24);
4849 elf_section_data (splt->output_section)->this_hdr.sh_entsize = 0;
4853 return TRUE;
4856 /* We need to use a special link routine to handle the .mdebug section.
4857 We need to merge all instances of these sections together, not write
4858 them all out sequentially. */
4860 static bfd_boolean
4861 elf64_alpha_final_link (bfd *abfd, struct bfd_link_info *info)
4863 asection *o;
4864 struct bfd_link_order *p;
4865 asection *mdebug_sec;
4866 struct ecoff_debug_info debug;
4867 const struct ecoff_debug_swap *swap
4868 = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
4869 HDRR *symhdr = &debug.symbolic_header;
4870 PTR mdebug_handle = NULL;
4872 /* Go through the sections and collect the mdebug information. */
4873 mdebug_sec = NULL;
4874 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4876 if (strcmp (o->name, ".mdebug") == 0)
4878 struct extsym_info einfo;
4880 /* We have found the .mdebug section in the output file.
4881 Look through all the link_orders comprising it and merge
4882 the information together. */
4883 symhdr->magic = swap->sym_magic;
4884 /* FIXME: What should the version stamp be? */
4885 symhdr->vstamp = 0;
4886 symhdr->ilineMax = 0;
4887 symhdr->cbLine = 0;
4888 symhdr->idnMax = 0;
4889 symhdr->ipdMax = 0;
4890 symhdr->isymMax = 0;
4891 symhdr->ioptMax = 0;
4892 symhdr->iauxMax = 0;
4893 symhdr->issMax = 0;
4894 symhdr->issExtMax = 0;
4895 symhdr->ifdMax = 0;
4896 symhdr->crfd = 0;
4897 symhdr->iextMax = 0;
4899 /* We accumulate the debugging information itself in the
4900 debug_info structure. */
4901 debug.line = NULL;
4902 debug.external_dnr = NULL;
4903 debug.external_pdr = NULL;
4904 debug.external_sym = NULL;
4905 debug.external_opt = NULL;
4906 debug.external_aux = NULL;
4907 debug.ss = NULL;
4908 debug.ssext = debug.ssext_end = NULL;
4909 debug.external_fdr = NULL;
4910 debug.external_rfd = NULL;
4911 debug.external_ext = debug.external_ext_end = NULL;
4913 mdebug_handle = bfd_ecoff_debug_init (abfd, &debug, swap, info);
4914 if (mdebug_handle == (PTR) NULL)
4915 return FALSE;
4917 if (1)
4919 asection *s;
4920 EXTR esym;
4921 bfd_vma last = 0;
4922 unsigned int i;
4923 static const char * const name[] =
4925 ".text", ".init", ".fini", ".data",
4926 ".rodata", ".sdata", ".sbss", ".bss"
4928 static const int sc[] = { scText, scInit, scFini, scData,
4929 scRData, scSData, scSBss, scBss };
4931 esym.jmptbl = 0;
4932 esym.cobol_main = 0;
4933 esym.weakext = 0;
4934 esym.reserved = 0;
4935 esym.ifd = ifdNil;
4936 esym.asym.iss = issNil;
4937 esym.asym.st = stLocal;
4938 esym.asym.reserved = 0;
4939 esym.asym.index = indexNil;
4940 for (i = 0; i < 8; i++)
4942 esym.asym.sc = sc[i];
4943 s = bfd_get_section_by_name (abfd, name[i]);
4944 if (s != NULL)
4946 esym.asym.value = s->vma;
4947 last = s->vma + s->size;
4949 else
4950 esym.asym.value = last;
4952 if (! bfd_ecoff_debug_one_external (abfd, &debug, swap,
4953 name[i], &esym))
4954 return FALSE;
4958 for (p = o->map_head.link_order;
4959 p != (struct bfd_link_order *) NULL;
4960 p = p->next)
4962 asection *input_section;
4963 bfd *input_bfd;
4964 const struct ecoff_debug_swap *input_swap;
4965 struct ecoff_debug_info input_debug;
4966 char *eraw_src;
4967 char *eraw_end;
4969 if (p->type != bfd_indirect_link_order)
4971 if (p->type == bfd_data_link_order)
4972 continue;
4973 abort ();
4976 input_section = p->u.indirect.section;
4977 input_bfd = input_section->owner;
4979 if (bfd_get_flavour (input_bfd) != bfd_target_elf_flavour
4980 || (get_elf_backend_data (input_bfd)
4981 ->elf_backend_ecoff_debug_swap) == NULL)
4983 /* I don't know what a non ALPHA ELF bfd would be
4984 doing with a .mdebug section, but I don't really
4985 want to deal with it. */
4986 continue;
4989 input_swap = (get_elf_backend_data (input_bfd)
4990 ->elf_backend_ecoff_debug_swap);
4992 BFD_ASSERT (p->size == input_section->size);
4994 /* The ECOFF linking code expects that we have already
4995 read in the debugging information and set up an
4996 ecoff_debug_info structure, so we do that now. */
4997 if (!elf64_alpha_read_ecoff_info (input_bfd, input_section,
4998 &input_debug))
4999 return FALSE;
5001 if (! (bfd_ecoff_debug_accumulate
5002 (mdebug_handle, abfd, &debug, swap, input_bfd,
5003 &input_debug, input_swap, info)))
5004 return FALSE;
5006 /* Loop through the external symbols. For each one with
5007 interesting information, try to find the symbol in
5008 the linker global hash table and save the information
5009 for the output external symbols. */
5010 eraw_src = input_debug.external_ext;
5011 eraw_end = (eraw_src
5012 + (input_debug.symbolic_header.iextMax
5013 * input_swap->external_ext_size));
5014 for (;
5015 eraw_src < eraw_end;
5016 eraw_src += input_swap->external_ext_size)
5018 EXTR ext;
5019 const char *name;
5020 struct alpha_elf_link_hash_entry *h;
5022 (*input_swap->swap_ext_in) (input_bfd, (PTR) eraw_src, &ext);
5023 if (ext.asym.sc == scNil
5024 || ext.asym.sc == scUndefined
5025 || ext.asym.sc == scSUndefined)
5026 continue;
5028 name = input_debug.ssext + ext.asym.iss;
5029 h = alpha_elf_link_hash_lookup (alpha_elf_hash_table (info),
5030 name, FALSE, FALSE, TRUE);
5031 if (h == NULL || h->esym.ifd != -2)
5032 continue;
5034 if (ext.ifd != -1)
5036 BFD_ASSERT (ext.ifd
5037 < input_debug.symbolic_header.ifdMax);
5038 ext.ifd = input_debug.ifdmap[ext.ifd];
5041 h->esym = ext;
5044 /* Free up the information we just read. */
5045 free (input_debug.line);
5046 free (input_debug.external_dnr);
5047 free (input_debug.external_pdr);
5048 free (input_debug.external_sym);
5049 free (input_debug.external_opt);
5050 free (input_debug.external_aux);
5051 free (input_debug.ss);
5052 free (input_debug.ssext);
5053 free (input_debug.external_fdr);
5054 free (input_debug.external_rfd);
5055 free (input_debug.external_ext);
5057 /* Hack: reset the SEC_HAS_CONTENTS flag so that
5058 elf_link_input_bfd ignores this section. */
5059 input_section->flags &=~ SEC_HAS_CONTENTS;
5062 /* Build the external symbol information. */
5063 einfo.abfd = abfd;
5064 einfo.info = info;
5065 einfo.debug = &debug;
5066 einfo.swap = swap;
5067 einfo.failed = FALSE;
5068 elf_link_hash_traverse (elf_hash_table (info),
5069 elf64_alpha_output_extsym,
5070 (PTR) &einfo);
5071 if (einfo.failed)
5072 return FALSE;
5074 /* Set the size of the .mdebug section. */
5075 o->size = bfd_ecoff_debug_size (abfd, &debug, swap);
5077 /* Skip this section later on (I don't think this currently
5078 matters, but someday it might). */
5079 o->map_head.link_order = (struct bfd_link_order *) NULL;
5081 mdebug_sec = o;
5085 /* Invoke the regular ELF backend linker to do all the work. */
5086 if (! bfd_elf_final_link (abfd, info))
5087 return FALSE;
5089 /* Now write out the computed sections. */
5091 /* The .got subsections... */
5093 bfd *i, *dynobj = elf_hash_table(info)->dynobj;
5094 for (i = alpha_elf_hash_table(info)->got_list;
5095 i != NULL;
5096 i = alpha_elf_tdata(i)->got_link_next)
5098 asection *sgot;
5100 /* elf_bfd_final_link already did everything in dynobj. */
5101 if (i == dynobj)
5102 continue;
5104 sgot = alpha_elf_tdata(i)->got;
5105 if (! bfd_set_section_contents (abfd, sgot->output_section,
5106 sgot->contents,
5107 (file_ptr) sgot->output_offset,
5108 sgot->size))
5109 return FALSE;
5113 if (mdebug_sec != (asection *) NULL)
5115 BFD_ASSERT (abfd->output_has_begun);
5116 if (! bfd_ecoff_write_accumulated_debug (mdebug_handle, abfd, &debug,
5117 swap, info,
5118 mdebug_sec->filepos))
5119 return FALSE;
5121 bfd_ecoff_debug_free (mdebug_handle, abfd, &debug, swap, info);
5124 return TRUE;
5127 static enum elf_reloc_type_class
5128 elf64_alpha_reloc_type_class (const Elf_Internal_Rela *rela)
5130 switch ((int) ELF64_R_TYPE (rela->r_info))
5132 case R_ALPHA_RELATIVE:
5133 return reloc_class_relative;
5134 case R_ALPHA_JMP_SLOT:
5135 return reloc_class_plt;
5136 case R_ALPHA_COPY:
5137 return reloc_class_copy;
5138 default:
5139 return reloc_class_normal;
5143 static const struct bfd_elf_special_section elf64_alpha_special_sections[] =
5145 { ".sbss", 5, -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_ALPHA_GPREL },
5146 { ".sdata", 6, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_ALPHA_GPREL },
5147 { NULL, 0, 0, 0, 0 }
5150 /* ECOFF swapping routines. These are used when dealing with the
5151 .mdebug section, which is in the ECOFF debugging format. Copied
5152 from elf32-mips.c. */
5153 static const struct ecoff_debug_swap
5154 elf64_alpha_ecoff_debug_swap =
5156 /* Symbol table magic number. */
5157 magicSym2,
5158 /* Alignment of debugging information. E.g., 4. */
5160 /* Sizes of external symbolic information. */
5161 sizeof (struct hdr_ext),
5162 sizeof (struct dnr_ext),
5163 sizeof (struct pdr_ext),
5164 sizeof (struct sym_ext),
5165 sizeof (struct opt_ext),
5166 sizeof (struct fdr_ext),
5167 sizeof (struct rfd_ext),
5168 sizeof (struct ext_ext),
5169 /* Functions to swap in external symbolic data. */
5170 ecoff_swap_hdr_in,
5171 ecoff_swap_dnr_in,
5172 ecoff_swap_pdr_in,
5173 ecoff_swap_sym_in,
5174 ecoff_swap_opt_in,
5175 ecoff_swap_fdr_in,
5176 ecoff_swap_rfd_in,
5177 ecoff_swap_ext_in,
5178 _bfd_ecoff_swap_tir_in,
5179 _bfd_ecoff_swap_rndx_in,
5180 /* Functions to swap out external symbolic data. */
5181 ecoff_swap_hdr_out,
5182 ecoff_swap_dnr_out,
5183 ecoff_swap_pdr_out,
5184 ecoff_swap_sym_out,
5185 ecoff_swap_opt_out,
5186 ecoff_swap_fdr_out,
5187 ecoff_swap_rfd_out,
5188 ecoff_swap_ext_out,
5189 _bfd_ecoff_swap_tir_out,
5190 _bfd_ecoff_swap_rndx_out,
5191 /* Function to read in symbolic data. */
5192 elf64_alpha_read_ecoff_info
5195 /* Use a non-standard hash bucket size of 8. */
5197 static const struct elf_size_info alpha_elf_size_info =
5199 sizeof (Elf64_External_Ehdr),
5200 sizeof (Elf64_External_Phdr),
5201 sizeof (Elf64_External_Shdr),
5202 sizeof (Elf64_External_Rel),
5203 sizeof (Elf64_External_Rela),
5204 sizeof (Elf64_External_Sym),
5205 sizeof (Elf64_External_Dyn),
5206 sizeof (Elf_External_Note),
5209 64, 3,
5210 ELFCLASS64, EV_CURRENT,
5211 bfd_elf64_write_out_phdrs,
5212 bfd_elf64_write_shdrs_and_ehdr,
5213 bfd_elf64_write_relocs,
5214 bfd_elf64_swap_symbol_in,
5215 bfd_elf64_swap_symbol_out,
5216 bfd_elf64_slurp_reloc_table,
5217 bfd_elf64_slurp_symbol_table,
5218 bfd_elf64_swap_dyn_in,
5219 bfd_elf64_swap_dyn_out,
5220 bfd_elf64_swap_reloc_in,
5221 bfd_elf64_swap_reloc_out,
5222 bfd_elf64_swap_reloca_in,
5223 bfd_elf64_swap_reloca_out
5226 #define TARGET_LITTLE_SYM bfd_elf64_alpha_vec
5227 #define TARGET_LITTLE_NAME "elf64-alpha"
5228 #define ELF_ARCH bfd_arch_alpha
5229 #define ELF_MACHINE_CODE EM_ALPHA
5230 #define ELF_MAXPAGESIZE 0x10000
5232 #define bfd_elf64_bfd_link_hash_table_create \
5233 elf64_alpha_bfd_link_hash_table_create
5235 #define bfd_elf64_bfd_reloc_type_lookup \
5236 elf64_alpha_bfd_reloc_type_lookup
5237 #define elf_info_to_howto \
5238 elf64_alpha_info_to_howto
5240 #define bfd_elf64_mkobject \
5241 elf64_alpha_mkobject
5242 #define elf_backend_object_p \
5243 elf64_alpha_object_p
5245 #define elf_backend_section_from_shdr \
5246 elf64_alpha_section_from_shdr
5247 #define elf_backend_section_flags \
5248 elf64_alpha_section_flags
5249 #define elf_backend_fake_sections \
5250 elf64_alpha_fake_sections
5252 #define bfd_elf64_bfd_is_local_label_name \
5253 elf64_alpha_is_local_label_name
5254 #define bfd_elf64_find_nearest_line \
5255 elf64_alpha_find_nearest_line
5256 #define bfd_elf64_bfd_relax_section \
5257 elf64_alpha_relax_section
5259 #define elf_backend_add_symbol_hook \
5260 elf64_alpha_add_symbol_hook
5261 #define elf_backend_check_relocs \
5262 elf64_alpha_check_relocs
5263 #define elf_backend_create_dynamic_sections \
5264 elf64_alpha_create_dynamic_sections
5265 #define elf_backend_adjust_dynamic_symbol \
5266 elf64_alpha_adjust_dynamic_symbol
5267 #define elf_backend_always_size_sections \
5268 elf64_alpha_always_size_sections
5269 #define elf_backend_size_dynamic_sections \
5270 elf64_alpha_size_dynamic_sections
5271 #define elf_backend_relocate_section \
5272 elf64_alpha_relocate_section
5273 #define elf_backend_finish_dynamic_symbol \
5274 elf64_alpha_finish_dynamic_symbol
5275 #define elf_backend_finish_dynamic_sections \
5276 elf64_alpha_finish_dynamic_sections
5277 #define bfd_elf64_bfd_final_link \
5278 elf64_alpha_final_link
5279 #define elf_backend_reloc_type_class \
5280 elf64_alpha_reloc_type_class
5282 #define elf_backend_ecoff_debug_swap \
5283 &elf64_alpha_ecoff_debug_swap
5285 #define elf_backend_size_info \
5286 alpha_elf_size_info
5288 #define elf_backend_special_sections \
5289 elf64_alpha_special_sections
5291 /* A few constants that determine how the .plt section is set up. */
5292 #define elf_backend_want_got_plt 0
5293 #define elf_backend_plt_readonly 0
5294 #define elf_backend_want_plt_sym 1
5295 #define elf_backend_got_header_size 0
5297 #include "elf64-target.h"
5299 /* FreeBSD support. */
5301 #undef TARGET_LITTLE_SYM
5302 #define TARGET_LITTLE_SYM bfd_elf64_alpha_freebsd_vec
5303 #undef TARGET_LITTLE_NAME
5304 #define TARGET_LITTLE_NAME "elf64-alpha-freebsd"
5306 /* The kernel recognizes executables as valid only if they carry a
5307 "FreeBSD" label in the ELF header. So we put this label on all
5308 executables and (for simplicity) also all other object files. */
5310 static void
5311 elf64_alpha_fbsd_post_process_headers (bfd * abfd,
5312 struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
5314 Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */
5316 i_ehdrp = elf_elfheader (abfd);
5318 /* Put an ABI label supported by FreeBSD >= 4.1. */
5319 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
5320 #ifdef OLD_FREEBSD_ABI_LABEL
5321 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5322 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5323 #endif
5326 #undef elf_backend_post_process_headers
5327 #define elf_backend_post_process_headers \
5328 elf64_alpha_fbsd_post_process_headers
5330 #undef elf64_bed
5331 #define elf64_bed elf64_alpha_fbsd_bed
5333 #include "elf64-target.h"