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2002-02-18 David O'Brien <obrien@FreeBSD.org>
[binutils.git] / bfd / elf32-openrisc.c
blob5f603660345849bd802361f1600cbf4ecb6373a3
1 /* OpenRISC-specific support for 32-bit ELF.
2 Copyright 2001 Free Software Foundation, Inc.
3 Contributed by Johan Rydberg, jrydberg@opencores.org
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "libbfd.h"
24 #include "elf-bfd.h"
25 #include "elf/openrisc.h"
26 #include "libiberty.h"
27
28 /* Forward declarations. */
29
30 static reloc_howto_type *openrisc_reloc_type_lookup
31 PARAMS ((bfd * , bfd_reloc_code_real_type));
32 static void openrisc_info_to_howto_rela
33 PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
34 static boolean openrisc_elf_relocate_section
35 PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
36 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
37 static bfd_reloc_status_type openrisc_final_link_relocate
38 PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
39 Elf_Internal_Rela *, bfd_vma));
40 static boolean openrisc_elf_gc_sweep_hook
41 PARAMS ((bfd *, struct bfd_link_info *, asection *,
42 const Elf_Internal_Rela *));
43 static asection * openrisc_elf_gc_mark_hook
44 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
45 struct elf_link_hash_entry *, Elf_Internal_Sym *));
46 static boolean openrisc_elf_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49 static boolean openrisc_elf_object_p
50 PARAMS ((bfd *));
51 static void openrisc_elf_final_write_processing
52 PARAMS ((bfd *, boolean));
53
54
55 static reloc_howto_type openrisc_elf_howto_table[] =
56 {
57 /* This reloc does nothing. */
58 HOWTO (R_OPENRISC_NONE, /* type */
59 0, /* rightshift */
60 2, /* size (0 = byte, 1 = short, 2 = long) */
61 32, /* bitsize */
62 false, /* pc_relative */
63 0, /* bitpos */
64 complain_overflow_bitfield, /* complain_on_overflow */
65 bfd_elf_generic_reloc, /* special_function */
66 "R_OPENRISC_NONE", /* name */
67 false, /* partial_inplace */
68 0, /* src_mask */
69 0, /* dst_mask */
70 false), /* pcrel_offset */
71
72 /* A PC relative 26 bit relocation, right shifted by 2. */
73 HOWTO (R_OPENRISC_INSN_REL_26, /* type */
74 2, /* rightshift */
75 2, /* size (0 = byte, 1 = short, 2 = long) */
76 26, /* bitsize */
77 true, /* pc_relative */
78 0, /* bitpos */
79 complain_overflow_signed, /* complain_on_overflow */
80 bfd_elf_generic_reloc, /* special_function */
81 "R_OPENRISC_INSN_REL_26", /* name */
82 false, /* partial_inplace */
83 0x00000000, /* src_mask */
84 0x03ffffff, /* dst_mask */
85 false), /* pcrel_offset */
86
87 /* A absolute 26 bit relocation, right shifted by 2. */
88 HOWTO (R_OPENRISC_INSN_ABS_26, /* type */
89 2, /* rightshift */
90 2, /* size (0 = byte, 1 = short, 2 = long) */
91 26, /* bitsize */
92 false, /* pc_relative */
93 0, /* bitpos */
94 complain_overflow_signed, /* complain_on_overflow */
95 bfd_elf_generic_reloc, /* special_function */
96 "R_OPENRISC_INSN_ABS_26", /* name */
97 false, /* partial_inplace */
98 0x00000000, /* src_mask */
99 0x03ffffff, /* dst_mask */
100 false), /* pcrel_offset */
101
102 HOWTO (R_OPENRISC_LO_16_IN_INSN, /* type */
103 0, /* rightshift */
104 1, /* size (0 = byte, 1 = short, 2 = long) */
105 16, /* bitsize */
106 false, /* pc_relative */
107 0, /* bitpos */
108 complain_overflow_dont, /* complain_on_overflow */
109 bfd_elf_generic_reloc, /* special_function */
110 "R_OPENRISC_LO_16_IN_INSN", /* name */
111 false, /* partial_inplace */
112 0, /* src_mask */
113 0x0000ffff, /* dst_mask */
114 false), /* pcrel_offset */
115
116 HOWTO (R_OPENRISC_HI_16_IN_INSN, /* type */
117 16, /* rightshift */
118 1, /* size (0 = byte, 1 = short, 2 = long) */
119 16, /* bitsize */
120 false, /* pc_relative */
121 0, /* bitpos */
122 complain_overflow_dont, /* complain_on_overflow */
123 bfd_elf_generic_reloc, /* special_function */
124 "R_OPENRISC_HI_16_IN_INSN", /* name */
125 false, /* partial_inplace */
126 0, /* src_mask */
127 0x0000ffff, /* dst_mask */
128 false), /* pcrel_offset */
129
130 /* An 8 bit absolute relocation. */
131 HOWTO (R_OPENRISC_8, /* type */
132 0, /* rightshift */
133 0, /* size (0 = byte, 1 = short, 2 = long) */
134 8, /* bitsize */
135 false, /* pc_relative */
136 0, /* bitpos */
137 complain_overflow_bitfield, /* complain_on_overflow */
138 bfd_elf_generic_reloc, /* special_function */
139 "R_OPENRISC_8", /* name */
140 true, /* partial_inplace */
141 0x0000, /* src_mask */
142 0x00ff, /* dst_mask */
143 false), /* pcrel_offset */
144
145 /* A 16 bit absolute relocation. */
146 HOWTO (R_OPENRISC_16, /* type */
147 0, /* rightshift */
148 1, /* size (0 = byte, 1 = short, 2 = long) */
149 16, /* bitsize */
150 false, /* pc_relative */
151 0, /* bitpos */
152 complain_overflow_bitfield, /* complain_on_overflow */
153 bfd_elf_generic_reloc, /* special_function */
154 "R_OPENRISC_16", /* name */
155 true, /* partial_inplace */
156 0x00000000, /* src_mask */
157 0x0000ffff, /* dst_mask */
158 false), /* pcrel_offset */
159
160 /* A 32 bit absolute relocation. */
161 HOWTO (R_OPENRISC_32, /* type */
162 0, /* rightshift */
163 2, /* size (0 = byte, 1 = short, 2 = long) */
164 32, /* bitsize */
165 false, /* pc_relative */
166 0, /* bitpos */
167 complain_overflow_bitfield, /* complain_on_overflow */
168 bfd_elf_generic_reloc, /* special_function */
169 "R_OPENRISC_32", /* name */
170 true, /* partial_inplace */
171 0x00000000, /* src_mask */
172 0xffffffff, /* dst_mask */
173 false), /* pcrel_offset */
174
175 /* GNU extension to record C++ vtable hierarchy */
176 HOWTO (R_OPENRISC_GNU_VTINHERIT, /* type */
177 0, /* rightshift */
178 2, /* size (0 = byte, 1 = short, 2 = long) */
179 0, /* bitsize */
180 false, /* pc_relative */
181 0, /* bitpos */
182 complain_overflow_dont, /* complain_on_overflow */
183 NULL, /* special_function */
184 "R_OPENRISC_GNU_VTINHERIT", /* name */
185 false, /* partial_inplace */
186 0, /* src_mask */
187 0, /* dst_mask */
188 false), /* pcrel_offset */
189
190 /* GNU extension to record C++ vtable member usage */
191 HOWTO (R_OPENRISC_GNU_VTENTRY, /* type */
192 0, /* rightshift */
193 2, /* size (0 = byte, 1 = short, 2 = long) */
194 0, /* bitsize */
195 false, /* pc_relative */
196 0, /* bitpos */
197 complain_overflow_dont, /* complain_on_overflow */
198 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
199 "R_OPENRISC_GNU_VTENTRY", /* name */
200 false, /* partial_inplace */
201 0, /* src_mask */
202 0, /* dst_mask */
203 false), /* pcrel_offset */
204 };
205
206 /* Map BFD reloc types to OpenRISC ELF reloc types. */
207
208 struct openrisc_reloc_map
209 {
210 bfd_reloc_code_real_type bfd_reloc_val;
211 unsigned int openrisc_reloc_val;
212 };
213
214 static const struct openrisc_reloc_map openrisc_reloc_map[] =
215 {
216 { BFD_RELOC_NONE, R_OPENRISC_NONE },
217 { BFD_RELOC_32, R_OPENRISC_32 },
218 { BFD_RELOC_16, R_OPENRISC_16 },
219 { BFD_RELOC_8, R_OPENRISC_8 },
220 { BFD_RELOC_OPENRISC_REL_26,R_OPENRISC_INSN_REL_26 },
221 { BFD_RELOC_OPENRISC_ABS_26,R_OPENRISC_INSN_ABS_26 },
222 { BFD_RELOC_HI16, R_OPENRISC_HI_16_IN_INSN },
223 { BFD_RELOC_LO16, R_OPENRISC_LO_16_IN_INSN },
224 { BFD_RELOC_VTABLE_INHERIT, R_OPENRISC_GNU_VTINHERIT },
225 { BFD_RELOC_VTABLE_ENTRY, R_OPENRISC_GNU_VTENTRY }
226 };
227
228 static reloc_howto_type *
229 openrisc_reloc_type_lookup (abfd, code)
230 bfd * abfd ATTRIBUTE_UNUSED;
231 bfd_reloc_code_real_type code;
232 {
233 unsigned int i;
234
235 for (i = ARRAY_SIZE (openrisc_reloc_map); --i;)
236 if (openrisc_reloc_map[i].bfd_reloc_val == code)
237 return & openrisc_elf_howto_table[openrisc_reloc_map[i].
238 openrisc_reloc_val];
239
240 return NULL;
241 }
242
243 /* Set the howto pointer for an OpenRISC ELF reloc. */
244
245 static void
246 openrisc_info_to_howto_rela (abfd, cache_ptr, dst)
247 bfd * abfd ATTRIBUTE_UNUSED;
248 arelent * cache_ptr;
249 Elf32_Internal_Rela * dst;
250 {
251 unsigned int r_type;
252
253 r_type = ELF32_R_TYPE (dst->r_info);
254 BFD_ASSERT (r_type < (unsigned int) R_OPENRISC_max);
255 cache_ptr->howto = & openrisc_elf_howto_table[r_type];
256 }
257
258 /* Perform a single relocation. By default we use the standard BFD
259 routines, but a few relocs, we have to do them ourselves. */
260
261 static bfd_reloc_status_type
262 openrisc_final_link_relocate (howto, input_bfd, input_section, contents, rel,
263 relocation)
264 reloc_howto_type *howto;
265 bfd *input_bfd;
266 asection *input_section;
267 bfd_byte *contents;
268 Elf_Internal_Rela *rel;
269 bfd_vma relocation;
270 {
271 bfd_reloc_status_type r = bfd_reloc_ok;
272
273 switch (howto->type)
274 {
275 case R_OPENRISC_LO_16_IN_INSN:
276 relocation &= 0xffff;
277 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
278 contents, rel->r_offset,
279 relocation, rel->r_addend);
280 break;
281
282 default:
283 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
284 contents, rel->r_offset,
285 relocation, rel->r_addend);
286 }
287
288 return r;
289 }
290
291 /* Relocate an OpenRISC ELF section.
292 There is some attempt to make this function usable for many architectures,
293 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
294 if only to serve as a learning tool.
295
296 The RELOCATE_SECTION function is called by the new ELF backend linker
297 to handle the relocations for a section.
298
299 The relocs are always passed as Rela structures; if the section
300 actually uses Rel structures, the r_addend field will always be
301 zero.
302
303 This function is responsible for adjusting the section contents as
304 necessary, and (if using Rela relocs and generating a relocateable
305 output file) adjusting the reloc addend as necessary.
306
307 This function does not have to worry about setting the reloc
308 address or the reloc symbol index.
309
310 LOCAL_SYMS is a pointer to the swapped in local symbols.
311
312 LOCAL_SECTIONS is an array giving the section in the input file
313 corresponding to the st_shndx field of each local symbol.
314
315 The global hash table entry for the global symbols can be found
316 via elf_sym_hashes (input_bfd).
317
318 When generating relocateable output, this function must handle
319 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
320 going to be the section symbol corresponding to the output
321 section, which means that the addend must be adjusted
322 accordingly. */
323
324 static boolean
325 openrisc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
326 contents, relocs, local_syms, local_sections)
327 bfd *output_bfd;
328 struct bfd_link_info *info;
329 bfd *input_bfd;
330 asection *input_section;
331 bfd_byte *contents;
332 Elf_Internal_Rela *relocs;
333 Elf_Internal_Sym *local_syms;
334 asection **local_sections;
335 {
336 Elf_Internal_Shdr *symtab_hdr;
337 struct elf_link_hash_entry **sym_hashes;
338 Elf_Internal_Rela *rel;
339 Elf_Internal_Rela *relend;
340
341 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
342 sym_hashes = elf_sym_hashes (input_bfd);
343 relend = relocs + input_section->reloc_count;
344
345 for (rel = relocs; rel < relend; rel++)
346 {
347 reloc_howto_type *howto;
348 unsigned long r_symndx;
349 Elf_Internal_Sym *sym;
350 asection *sec;
351 struct elf_link_hash_entry *h;
352 bfd_vma relocation;
353 bfd_reloc_status_type r;
354 const char *name = NULL;
355 int r_type;
356
357 r_type = ELF32_R_TYPE (rel->r_info);
358 r_symndx = ELF32_R_SYM (rel->r_info);
359
360 if (r_type == R_OPENRISC_GNU_VTINHERIT
361 || r_type == R_OPENRISC_GNU_VTENTRY)
362 continue;
363
364 if (info->relocateable)
365 {
366 /* This is a relocateable link. We don't have to change
367 anything, unless the reloc is against a section symbol,
368 in which case we have to adjust according to where the
369 section symbol winds up in the output section. */
370 if (r_symndx < symtab_hdr->sh_info)
371 {
372 sym = local_syms + r_symndx;
373
374 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
375 {
376 sec = local_sections[r_symndx];
377 rel->r_addend += sec->output_offset + sym->st_value;
378 }
379 }
380 continue;
381 }
382
383 if ((unsigned int) r_type >
384 (sizeof openrisc_elf_howto_table / sizeof (reloc_howto_type)))
385 abort ();
386
387 /* This is a final link. */
388 howto = openrisc_elf_howto_table + ELF32_R_TYPE (rel->r_info);
389 h = NULL;
390 sym = NULL;
391 sec = NULL;
392
393 if (r_symndx < symtab_hdr->sh_info)
394 {
395 sym = local_syms + r_symndx;
396 sec = local_sections[r_symndx];
397 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
398
399 name = bfd_elf_string_from_elf_section
400 (input_bfd, symtab_hdr->sh_link, sym->st_name);
401 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
402 }
403 else
404 {
405 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
406
407 while (h->root.type == bfd_link_hash_indirect
408 || h->root.type == bfd_link_hash_warning)
409 h = (struct elf_link_hash_entry *) h->root.u.i.link;
410
411 name = h->root.root.string;
412
413 if (h->root.type == bfd_link_hash_defined
414 || h->root.type == bfd_link_hash_defweak)
415 {
416 sec = h->root.u.def.section;
417 relocation = (h->root.u.def.value
418 + sec->output_section->vma + sec->output_offset);
419 }
420 else if (h->root.type == bfd_link_hash_undefweak)
421 {
422 relocation = 0;
423 }
424 else
425 {
426 if (!((*info->callbacks->undefined_symbol)
427 (info, h->root.root.string, input_bfd,
428 input_section, rel->r_offset, true)))
429 return false;
430 relocation = 0;
431 }
432 }
433
434 r = openrisc_final_link_relocate (howto, input_bfd, input_section,
435 contents, rel, relocation);
436
437 if (r != bfd_reloc_ok)
438 {
439 const char *msg = (const char *) NULL;
440
441 switch (r)
442 {
443 case bfd_reloc_overflow:
444 r = info->callbacks->reloc_overflow
445 (info, name, howto->name, (bfd_vma) 0,
446 input_bfd, input_section, rel->r_offset);
447 break;
448
449 case bfd_reloc_undefined:
450 r = info->callbacks->undefined_symbol
451 (info, name, input_bfd, input_section, rel->r_offset, true);
452 break;
453
454 case bfd_reloc_outofrange:
455 msg = _("internal error: out of range error");
456 break;
457
458 case bfd_reloc_notsupported:
459 msg = _("internal error: unsupported relocation error");
460 break;
461
462 case bfd_reloc_dangerous:
463 msg = _("internal error: dangerous relocation");
464 break;
465
466 default:
467 msg = _("internal error: unknown error");
468 break;
469 }
470
471 if (msg)
472 r = info->callbacks->warning
473 (info, msg, name, input_bfd, input_section, rel->r_offset);
474
475 if (!r)
476 return false;
477 }
478 }
479
480 return true;
481 }
482
483 /* Return the section that should be marked against GC for a given
484 relocation. */
485
486 static asection *
487 openrisc_elf_gc_mark_hook (abfd, info, rel, h, sym)
488 bfd *abfd ATTRIBUTE_UNUSED;
489 struct bfd_link_info *info ATTRIBUTE_UNUSED;
490 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED;
491 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED;
492 Elf_Internal_Sym *sym ATTRIBUTE_UNUSED;
493 {
494 if (h != NULL)
495 {
496 switch (ELF32_R_TYPE (rel->r_info))
497 {
498 case R_OPENRISC_GNU_VTINHERIT:
499 case R_OPENRISC_GNU_VTENTRY:
500 break;
501
502 default:
503 switch (h->root.type)
504 {
505 case bfd_link_hash_defined:
506 case bfd_link_hash_defweak:
507 return h->root.u.def.section;
508
509 case bfd_link_hash_common:
510 return h->root.u.c.p->section;
511
512 default:
513 break;
514 }
515 }
516 }
517 else
518 {
519 return bfd_section_from_elf_index (abfd, sym->st_shndx);
520 }
521
522 return NULL;
523 }
524
525 /* Update the got entry reference counts for the section being removed. */
526
527 static boolean
528 openrisc_elf_gc_sweep_hook (abfd, info, sec, relocs)
529 bfd *abfd ATTRIBUTE_UNUSED;
530 struct bfd_link_info *info ATTRIBUTE_UNUSED;
531 asection *sec ATTRIBUTE_UNUSED;
532 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
533 {
534 return true;
535 }
536
537 /* Look through the relocs for a section during the first phase.
538 Since we don't do .gots or .plts, we just need to consider the
539 virtual table relocs for gc. */
540
541 static boolean
542 openrisc_elf_check_relocs (abfd, info, sec, relocs)
543 bfd *abfd;
544 struct bfd_link_info *info;
545 asection *sec;
546 const Elf_Internal_Rela *relocs;
547 {
548 Elf_Internal_Shdr *symtab_hdr;
549 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
550 const Elf_Internal_Rela *rel;
551 const Elf_Internal_Rela *rel_end;
552
553 if (info->relocateable)
554 return true;
555
556 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
557 sym_hashes = elf_sym_hashes (abfd);
558 sym_hashes_end =
559 sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
560 if (!elf_bad_symtab (abfd))
561 sym_hashes_end -= symtab_hdr->sh_info;
562
563 rel_end = relocs + sec->reloc_count;
564 for (rel = relocs; rel < rel_end; rel++)
565 {
566 struct elf_link_hash_entry *h;
567 unsigned long r_symndx;
568
569 r_symndx = ELF32_R_SYM (rel->r_info);
570 if (r_symndx < symtab_hdr->sh_info)
571 h = NULL;
572 else
573 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
574
575 switch (ELF32_R_TYPE (rel->r_info))
576 {
577 /* This relocation describes the C++ object vtable hierarchy.
578 Reconstruct it for later use during GC. */
579 case R_OPENRISC_GNU_VTINHERIT:
580 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
581 return false;
582 break;
583
584 /* This relocation describes which C++ vtable entries are actually
585 used. Record for later use during GC. */
586 case R_OPENRISC_GNU_VTENTRY:
587 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
588 return false;
589 break;
590 }
591 }
592
593 return true;
594 }
595
596 /* Set the right machine number. */
597
598 static boolean
599 openrisc_elf_object_p (abfd)
600 bfd *abfd;
601 {
602 switch (elf_elfheader (abfd)->e_flags & 0xf)
603 {
604 default:
605 (void) bfd_default_set_arch_mach (abfd, bfd_arch_openrisc, 0);
606 break;
607 }
608 return true;
609 }
610
611 /* Store the machine number in the flags field. */
612
613 static void
614 openrisc_elf_final_write_processing (abfd, linker)
615 bfd *abfd;
616 boolean linker ATTRIBUTE_UNUSED;
617 {
618 unsigned long val;
619
620 switch (bfd_get_mach (abfd))
621 {
622 default:
623 val = 0;
624 break;
625 }
626
627 elf_elfheader (abfd)->e_flags &= ~0xf;
628 elf_elfheader (abfd)->e_flags |= val;
629 }
630
631
632 #define ELF_ARCH bfd_arch_openrisc
633 #define ELF_MACHINE_CODE EM_OPENRISC
634 #define ELF_MACHINE_ALT1 EM_OPENRISC_OLD
635 #define ELF_MAXPAGESIZE 0x1000
636
637 #define TARGET_BIG_SYM bfd_elf32_openrisc_vec
638 #define TARGET_BIG_NAME "elf32-openrisc"
639
640 #define elf_info_to_howto_rel NULL
641 #define elf_info_to_howto openrisc_info_to_howto_rela
642 #define elf_backend_relocate_section openrisc_elf_relocate_section
643 #define elf_backend_gc_mark_hook openrisc_elf_gc_mark_hook
644 #define elf_backend_gc_sweep_hook openrisc_elf_gc_sweep_hook
645 #define elf_backend_check_relocs openrisc_elf_check_relocs
646
647 #define elf_backend_can_gc_sections 1
648
649 #define bfd_elf32_bfd_reloc_type_lookup openrisc_reloc_type_lookup
650
651 #define elf_backend_object_p openrisc_elf_object_p
652 #define elf_backend_final_write_processing openrisc_elf_final_write_processing
653
654 #include "elf32-target.h"
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