1 /* MeP-specific support for 32-bit ELF.
2 Copyright (C) 2001-2016 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
19 MA 02110-1301, USA. */
26 #include "libiberty.h"
28 /* Forward declarations. */
30 /* Private relocation functions. */
32 #define MEPREL(type, size, bits, right, left, pcrel, overflow, mask) \
33 {(unsigned)type, right, size, bits, pcrel, left, overflow, bfd_elf_generic_reloc, #type, FALSE, 0, mask, 0 }
35 #define N complain_overflow_dont
36 #define S complain_overflow_signed
37 #define U complain_overflow_unsigned
39 static reloc_howto_type mep_elf_howto_table [] =
41 /* type, size, bits, leftshift, rightshift, pcrel, OD/OS/OU, mask. */
42 MEPREL (R_MEP_NONE, 3, 0, 0, 0, 0, N, 0),
43 MEPREL (R_RELC, 0, 0, 0, 0, 0, N, 0),
45 /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h. */
46 MEPREL (R_MEP_8, 0, 8, 0, 0, 0, U, 0xff),
47 MEPREL (R_MEP_16, 1, 16, 0, 0, 0, U, 0xffff),
48 MEPREL (R_MEP_32, 2, 32, 0, 0, 0, U, 0xffffffff),
49 MEPREL (R_MEP_PCREL8A2, 1, 8, 1, 1, 1, S, 0x00fe),
50 MEPREL (R_MEP_PCREL12A2,1, 12, 1, 1, 1, S, 0x0ffe),
51 MEPREL (R_MEP_PCREL17A2,2, 17, 0, 1, 1, S, 0x0000ffff),
52 MEPREL (R_MEP_PCREL24A2,2, 24, 0, 1, 1, S, 0x07f0ffff),
53 MEPREL (R_MEP_PCABS24A2,2, 24, 0, 1, 0, U, 0x07f0ffff),
54 MEPREL (R_MEP_LOW16, 2, 16, 0, 0, 0, N, 0x0000ffff),
55 MEPREL (R_MEP_HI16U, 2, 32, 0,16, 0, N, 0x0000ffff),
56 MEPREL (R_MEP_HI16S, 2, 32, 0,16, 0, N, 0x0000ffff),
57 MEPREL (R_MEP_GPREL, 2, 16, 0, 0, 0, S, 0x0000ffff),
58 MEPREL (R_MEP_TPREL, 2, 16, 0, 0, 0, S, 0x0000ffff),
59 MEPREL (R_MEP_TPREL7, 1, 7, 0, 0, 0, U, 0x007f),
60 MEPREL (R_MEP_TPREL7A2, 1, 7, 1, 1, 0, U, 0x007e),
61 MEPREL (R_MEP_TPREL7A4, 1, 7, 2, 2, 0, U, 0x007c),
62 MEPREL (R_MEP_UIMM24, 2, 24, 0, 0, 0, U, 0x00ffffff),
63 MEPREL (R_MEP_ADDR24A4, 2, 24, 0, 2, 0, U, 0x00fcffff),
64 MEPREL (R_MEP_GNU_VTINHERIT,1, 0,16,32, 0, N, 0x0000),
65 MEPREL (R_MEP_GNU_VTENTRY,1, 0,16,32, 0, N, 0x0000),
69 #define VALID_MEP_RELOC(N) ((N) >= 0 \
70 && (N) < ARRAY_SIZE (mep_elf_howto_table)
77 #define BFD_RELOC_MEP_NONE BFD_RELOC_NONE
78 #if defined (__STDC__) || defined (ALMOST_STDC) || defined (HAVE_STRINGIZE)
79 #define MAP(n) case BFD_RELOC_MEP_##n: type = R_MEP_##n; break
81 #define MAP(n) case BFD_RELOC_MEP_/**/n: type = R_MEP_/**/n; break
84 static reloc_howto_type *
86 (bfd * abfd ATTRIBUTE_UNUSED,
87 bfd_reloc_code_real_type code)
89 unsigned int type = 0;
103 case BFD_RELOC_VTABLE_ENTRY:
104 type = R_MEP_GNU_VTENTRY;
106 case BFD_RELOC_VTABLE_INHERIT:
107 type = R_MEP_GNU_VTINHERIT;
114 /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h. */
138 /* Pacify gcc -Wall. */
139 (*_bfd_error_handler) (_("mep: no reloc for code %d"), code);
143 if (mep_elf_howto_table[type].type != type)
145 (*_bfd_error_handler) (_("MeP: howto %d has type %d"),
146 type, mep_elf_howto_table[type].type);
150 return mep_elf_howto_table + type;
155 static reloc_howto_type *
156 mep_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
161 i < sizeof (mep_elf_howto_table) / sizeof (mep_elf_howto_table[0]);
163 if (mep_elf_howto_table[i].name != NULL
164 && strcasecmp (mep_elf_howto_table[i].name, r_name) == 0)
165 return &mep_elf_howto_table[i];
170 /* Perform a single relocation. */
172 static struct bfd_link_info *mep_info;
173 static int warn_tp = 0, warn_sda = 0;
182 struct bfd_link_hash_entry *h;
187 h = bfd_link_hash_lookup (mep_info->hash, name, FALSE, FALSE, TRUE);
188 if (h == 0 || h->type != bfd_link_hash_defined)
193 *cache = (h->u.def.value
194 + h->u.def.section->output_section->vma
195 + h->u.def.section->output_offset);
200 mep_tpoff_base (bfd_vma ofs)
202 static bfd_vma cache = 0;
203 return mep_lookup_global ("__tpbase", ofs, &cache, &warn_tp);
207 mep_sdaoff_base (bfd_vma ofs)
209 static bfd_vma cache = 0;
210 return mep_lookup_global ("__sdabase", ofs, &cache, &warn_sda);
213 static bfd_reloc_status_type
214 mep_final_link_relocate
215 (reloc_howto_type * howto,
217 asection * input_section,
219 Elf_Internal_Rela * rel,
226 bfd_reloc_status_type r = bfd_reloc_ok;
229 if (bfd_big_endian (input_bfd))
240 pc = (input_section->output_section->vma
241 + input_section->output_offset
244 s = relocation + rel->r_addend;
246 byte = (unsigned char *)contents + rel->r_offset;
248 if (howto->type == R_MEP_PCREL24A2
252 /* This is an unreachable branch to an undefined weak function.
253 Silently ignore it, since the opcode can't do that but should
254 never be executed anyway. */
258 if (howto->pc_relative)
261 u = (unsigned long) s;
266 /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h. */
267 case R_MEP_8: /* 76543210 */
268 if (u > 255) r = bfd_reloc_overflow;
269 byte[0] = (u & 0xff);
271 case R_MEP_16: /* fedcba9876543210 */
272 if (u > 65535) r = bfd_reloc_overflow;
273 byte[0^e2] = ((u >> 8) & 0xff);
274 byte[1^e2] = (u & 0xff);
276 case R_MEP_32: /* vutsrqponmlkjihgfedcba9876543210 */
277 byte[0^e4] = ((u >> 24) & 0xff);
278 byte[1^e4] = ((u >> 16) & 0xff);
279 byte[2^e4] = ((u >> 8) & 0xff);
280 byte[3^e4] = (u & 0xff);
282 case R_MEP_PCREL8A2: /* --------7654321- */
283 if (-128 > s || s > 127) r = bfd_reloc_overflow;
284 byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
286 case R_MEP_PCREL12A2: /* ----ba987654321- */
287 if (-2048 > s || s > 2047) r = bfd_reloc_overflow;
288 byte[0^e2] = (byte[0^e2] & 0xf0) | ((s >> 8) & 0x0f);
289 byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
291 case R_MEP_PCREL17A2: /* ----------------gfedcba987654321 */
292 if (-65536 > s || s > 65535) r = bfd_reloc_overflow;
293 byte[2^e2] = ((s >> 9) & 0xff);
294 byte[3^e2] = ((s >> 1) & 0xff);
296 case R_MEP_PCREL24A2: /* -----7654321----nmlkjihgfedcba98 */
297 if (-8388608 > s || s > 8388607) r = bfd_reloc_overflow;
298 byte[0^e2] = (byte[0^e2] & 0xf8) | ((s >> 5) & 0x07);
299 byte[1^e2] = (byte[1^e2] & 0x0f) | ((s << 3) & 0xf0);
300 byte[2^e2] = ((s >> 16) & 0xff);
301 byte[3^e2] = ((s >> 8) & 0xff);
303 case R_MEP_PCABS24A2: /* -----7654321----nmlkjihgfedcba98 */
304 if (u > 16777215) r = bfd_reloc_overflow;
305 byte[0^e2] = (byte[0^e2] & 0xf8) | ((u >> 5) & 0x07);
306 byte[1^e2] = (byte[1^e2] & 0x0f) | ((u << 3) & 0xf0);
307 byte[2^e2] = ((u >> 16) & 0xff);
308 byte[3^e2] = ((u >> 8) & 0xff);
310 case R_MEP_LOW16: /* ----------------fedcba9876543210 */
311 byte[2^e2] = ((u >> 8) & 0xff);
312 byte[3^e2] = (u & 0xff);
314 case R_MEP_HI16U: /* ----------------vutsrqponmlkjihg */
315 byte[2^e2] = ((u >> 24) & 0xff);
316 byte[3^e2] = ((u >> 16) & 0xff);
318 case R_MEP_HI16S: /* ----------------vutsrqponmlkjihg */
321 byte[2^e2] = ((s >> 24) & 0xff);
322 byte[3^e2] = ((s >> 16) & 0xff);
324 case R_MEP_GPREL: /* ----------------fedcba9876543210 */
325 s -= mep_sdaoff_base(rel->r_offset);
326 if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
327 byte[2^e2] = ((s >> 8) & 0xff);
328 byte[3^e2] = (s & 0xff);
330 case R_MEP_TPREL: /* ----------------fedcba9876543210 */
331 s -= mep_tpoff_base(rel->r_offset);
332 if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
333 byte[2^e2] = ((s >> 8) & 0xff);
334 byte[3^e2] = (s & 0xff);
336 case R_MEP_TPREL7: /* ---------6543210 */
337 u -= mep_tpoff_base(rel->r_offset);
338 if (u > 127) r = bfd_reloc_overflow;
339 byte[1^e2] = (byte[1^e2] & 0x80) | (u & 0x7f);
341 case R_MEP_TPREL7A2: /* ---------654321- */
342 u -= mep_tpoff_base(rel->r_offset);
343 if (u > 127) r = bfd_reloc_overflow;
344 byte[1^e2] = (byte[1^e2] & 0x81) | (u & 0x7e);
346 case R_MEP_TPREL7A4: /* ---------65432-- */
347 u -= mep_tpoff_base(rel->r_offset);
348 if (u > 127) r = bfd_reloc_overflow;
349 byte[1^e2] = (byte[1^e2] & 0x83) | (u & 0x7c);
351 case R_MEP_UIMM24: /* --------76543210nmlkjihgfedcba98 */
352 if (u > 16777215) r = bfd_reloc_overflow;
353 byte[1^e2] = (u & 0xff);
354 byte[2^e2] = ((u >> 16) & 0xff);
355 byte[3^e2] = ((u >> 8) & 0xff);
357 case R_MEP_ADDR24A4: /* --------765432--nmlkjihgfedcba98 */
358 if (u > 16777215) r = bfd_reloc_overflow;
359 byte[1^e2] = (byte[1^e2] & 0x03) | (u & 0xfc);
360 byte[2^e2] = ((u >> 16) & 0xff);
361 byte[3^e2] = ((u >> 8) & 0xff);
363 case R_MEP_GNU_VTINHERIT: /* ---------------- */
365 case R_MEP_GNU_VTENTRY: /* ---------------- */
375 /* Set the howto pointer for a MEP ELF reloc. */
378 mep_info_to_howto_rela
379 (bfd * abfd ATTRIBUTE_UNUSED,
381 Elf_Internal_Rela * dst)
385 r_type = ELF32_R_TYPE (dst->r_info);
386 if (r_type >= R_MEP_max)
388 _bfd_error_handler (_("%B: invalid MEP reloc number: %d"), abfd, r_type);
391 cache_ptr->howto = & mep_elf_howto_table [r_type];
394 /* Relocate a MEP ELF section.
395 There is some attempt to make this function usable for many architectures,
396 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
397 if only to serve as a learning tool.
399 The RELOCATE_SECTION function is called by the new ELF backend linker
400 to handle the relocations for a section.
402 The relocs are always passed as Rela structures; if the section
403 actually uses Rel structures, the r_addend field will always be
406 This function is responsible for adjusting the section contents as
407 necessary, and (if using Rela relocs and generating a relocatable
408 output file) adjusting the reloc addend as necessary.
410 This function does not have to worry about setting the reloc
411 address or the reloc symbol index.
413 LOCAL_SYMS is a pointer to the swapped in local symbols.
415 LOCAL_SECTIONS is an array giving the section in the input file
416 corresponding to the st_shndx field of each local symbol.
418 The global hash table entry for the global symbols can be found
419 via elf_sym_hashes (input_bfd).
421 When generating relocatable output, this function must handle
422 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
423 going to be the section symbol corresponding to the output
424 section, which means that the addend must be adjusted
428 mep_elf_relocate_section
429 (bfd * output_bfd ATTRIBUTE_UNUSED,
430 struct bfd_link_info * info,
432 asection * input_section,
434 Elf_Internal_Rela * relocs,
435 Elf_Internal_Sym * local_syms,
436 asection ** local_sections)
438 Elf_Internal_Shdr * symtab_hdr;
439 struct elf_link_hash_entry ** sym_hashes;
440 Elf_Internal_Rela * rel;
441 Elf_Internal_Rela * relend;
443 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
444 sym_hashes = elf_sym_hashes (input_bfd);
445 relend = relocs + input_section->reloc_count;
449 for (rel = relocs; rel < relend; rel ++)
451 reloc_howto_type * howto;
452 unsigned long r_symndx;
453 Elf_Internal_Sym * sym;
455 struct elf_link_hash_entry * h;
457 bfd_reloc_status_type r;
458 const char * name = NULL;
461 r_type = ELF32_R_TYPE (rel->r_info);
462 r_symndx = ELF32_R_SYM (rel->r_info);
463 howto = mep_elf_howto_table + ELF32_R_TYPE (rel->r_info);
468 if (r_symndx < symtab_hdr->sh_info)
470 sym = local_syms + r_symndx;
471 sec = local_sections [r_symndx];
472 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
474 name = bfd_elf_string_from_elf_section
475 (input_bfd, symtab_hdr->sh_link, sym->st_name);
476 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
480 bfd_boolean warned, unresolved_reloc, ignored;
482 RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel,
483 r_symndx, symtab_hdr, sym_hashes,
485 unresolved_reloc, warned, ignored);
487 name = h->root.root.string;
490 if (sec != NULL && discarded_section (sec))
491 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
492 rel, 1, relend, howto, 0, contents);
494 if (bfd_link_relocatable (info))
497 if (r_type == R_RELC)
498 r = bfd_elf_perform_complex_relocation (input_bfd, input_section,
499 contents, rel, relocation);
501 r = mep_final_link_relocate (howto, input_bfd, input_section,
502 contents, rel, relocation);
504 if (r != bfd_reloc_ok)
506 const char * msg = (const char *) NULL;
510 case bfd_reloc_overflow:
511 (*info->callbacks->reloc_overflow)
512 (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
513 input_bfd, input_section, rel->r_offset);
516 case bfd_reloc_undefined:
517 (*info->callbacks->undefined_symbol)
518 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
521 case bfd_reloc_outofrange:
522 msg = _("internal error: out of range error");
525 case bfd_reloc_notsupported:
526 msg = _("internal error: unsupported relocation error");
529 case bfd_reloc_dangerous:
530 msg = _("internal error: dangerous relocation");
534 msg = _("internal error: unknown error");
539 (*info->callbacks->warning) (info, msg, name, input_bfd,
540 input_section, rel->r_offset);
545 info->callbacks->undefined_symbol
546 (info, "__tpbase", input_bfd, input_section, warn_tp-1, TRUE);
548 info->callbacks->undefined_symbol
549 (info, "__sdabase", input_bfd, input_section, warn_sda-1, TRUE);
550 if (warn_sda || warn_tp)
556 /* Function to set the ELF flag bits. */
559 mep_elf_set_private_flags (bfd * abfd,
562 elf_elfheader (abfd)->e_flags = flags;
563 elf_flags_init (abfd) = TRUE;
567 /* Merge backend specific data from an object file to the output
568 object file when linking. */
571 mep_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd)
573 static bfd *last_ibfd = 0;
574 flagword old_flags, new_flags;
575 flagword old_partial, new_partial;
577 /* Check if we have the same endianness. */
578 if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE)
581 new_flags = elf_elfheader (ibfd)->e_flags;
582 old_flags = elf_elfheader (obfd)->e_flags;
585 _bfd_error_handler ("%B: old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s",
586 ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no");
589 /* First call, no flags set. */
590 if (!elf_flags_init (obfd))
592 elf_flags_init (obfd) = TRUE;
593 old_flags = new_flags;
595 else if ((new_flags | old_flags) & EF_MEP_LIBRARY)
597 /* Non-library flags trump library flags. The choice doesn't really
598 matter if both OLD_FLAGS and NEW_FLAGS have EF_MEP_LIBRARY set. */
599 if (old_flags & EF_MEP_LIBRARY)
600 old_flags = new_flags;
604 /* Make sure they're for the same mach. Allow upgrade from the "mep"
606 new_partial = (new_flags & EF_MEP_CPU_MASK);
607 old_partial = (old_flags & EF_MEP_CPU_MASK);
608 if (new_partial == old_partial)
610 else if (new_partial == EF_MEP_CPU_MEP)
612 else if (old_partial == EF_MEP_CPU_MEP)
613 old_flags = (old_flags & ~EF_MEP_CPU_MASK) | new_partial;
616 _bfd_error_handler (_("%B and %B are for different cores"), last_ibfd, ibfd);
617 bfd_set_error (bfd_error_invalid_target);
621 /* Make sure they're for the same me_module. Allow basic config to
622 mix with any other. */
623 new_partial = (new_flags & EF_MEP_INDEX_MASK);
624 old_partial = (old_flags & EF_MEP_INDEX_MASK);
625 if (new_partial == old_partial)
627 else if (new_partial == 0)
629 else if (old_partial == 0)
630 old_flags = (old_flags & ~EF_MEP_INDEX_MASK) | new_partial;
633 _bfd_error_handler (_("%B and %B are for different configurations"), last_ibfd, ibfd);
634 bfd_set_error (bfd_error_invalid_target);
639 elf_elfheader (obfd)->e_flags = old_flags;
644 /* This will be edited by the MeP configration tool. */
645 static const char * config_names[] =
648 /* start-mepcfgtool */
653 static const char * core_names[] =
655 "MeP", "MeP-c2", "MeP-c3", "MeP-h1"
659 mep_elf_print_private_bfd_data (bfd * abfd, void * ptr)
661 FILE * file = (FILE *) ptr;
662 flagword flags, partial_flags;
664 BFD_ASSERT (abfd != NULL && ptr != NULL);
666 /* Print normal ELF private data. */
667 _bfd_elf_print_private_bfd_data (abfd, ptr);
669 flags = elf_elfheader (abfd)->e_flags;
670 fprintf (file, _("private flags = 0x%lx"), (unsigned long) flags);
672 partial_flags = (flags & EF_MEP_CPU_MASK) >> 24;
673 if (partial_flags < ARRAY_SIZE (core_names))
674 fprintf (file, " core: %s", core_names[(long)partial_flags]);
676 partial_flags = flags & EF_MEP_INDEX_MASK;
677 if (partial_flags < ARRAY_SIZE (config_names))
678 fprintf (file, " me_module: %s", config_names[(long)partial_flags]);
685 /* Return the machine subcode from the ELF e_flags header. */
688 elf32_mep_machine (bfd * abfd)
690 switch (elf_elfheader (abfd)->e_flags & EF_MEP_CPU_MASK)
693 case EF_MEP_CPU_C2: return bfd_mach_mep;
694 case EF_MEP_CPU_C3: return bfd_mach_mep;
695 case EF_MEP_CPU_C4: return bfd_mach_mep;
696 case EF_MEP_CPU_C5: return bfd_mach_mep_c5;
697 case EF_MEP_CPU_H1: return bfd_mach_mep_h1;
704 mep_elf_object_p (bfd * abfd)
706 bfd_default_set_arch_mach (abfd, bfd_arch_mep, elf32_mep_machine (abfd));
711 mep_elf_section_flags (flagword * flags, const Elf_Internal_Shdr * hdr)
713 if (hdr->sh_flags & SHF_MEP_VLIW)
714 * flags |= SEC_MEP_VLIW;
719 mep_elf_fake_sections (bfd * abfd ATTRIBUTE_UNUSED,
720 Elf_Internal_Shdr * hdr,
723 if (sec->flags & SEC_MEP_VLIW)
724 hdr->sh_flags |= SHF_MEP_VLIW;
729 #define ELF_ARCH bfd_arch_mep
730 #define ELF_MACHINE_CODE EM_CYGNUS_MEP
731 #define ELF_MAXPAGESIZE 0x1000
733 #define TARGET_BIG_SYM mep_elf32_vec
734 #define TARGET_BIG_NAME "elf32-mep"
736 #define TARGET_LITTLE_SYM mep_elf32_le_vec
737 #define TARGET_LITTLE_NAME "elf32-mep-little"
739 #define elf_info_to_howto_rel NULL
740 #define elf_info_to_howto mep_info_to_howto_rela
741 #define elf_backend_relocate_section mep_elf_relocate_section
742 #define elf_backend_object_p mep_elf_object_p
743 #define elf_backend_section_flags mep_elf_section_flags
744 #define elf_backend_fake_sections mep_elf_fake_sections
746 #define bfd_elf32_bfd_reloc_type_lookup mep_reloc_type_lookup
747 #define bfd_elf32_bfd_reloc_name_lookup mep_reloc_name_lookup
748 #define bfd_elf32_bfd_set_private_flags mep_elf_set_private_flags
749 #define bfd_elf32_bfd_merge_private_bfd_data mep_elf_merge_private_bfd_data
750 #define bfd_elf32_bfd_print_private_bfd_data mep_elf_print_private_bfd_data
752 #define elf_backend_rela_normal 1
754 #include "elf32-target.h"