1 /* MeP-specific support for 32-bit ELF.
2 Copyright (C) 2001-2017 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 /* xgettext:c-format */
146 _bfd_error_handler (_("MeP: howto %d has type %d"),
147 type, mep_elf_howto_table[type].type);
151 return mep_elf_howto_table + type;
156 static reloc_howto_type *
157 mep_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
162 i < sizeof (mep_elf_howto_table) / sizeof (mep_elf_howto_table[0]);
164 if (mep_elf_howto_table[i].name != NULL
165 && strcasecmp (mep_elf_howto_table[i].name, r_name) == 0)
166 return &mep_elf_howto_table[i];
171 /* Perform a single relocation. */
173 static struct bfd_link_info *mep_info;
174 static int warn_tp = 0, warn_sda = 0;
183 struct bfd_link_hash_entry *h;
188 h = bfd_link_hash_lookup (mep_info->hash, name, FALSE, FALSE, TRUE);
189 if (h == 0 || h->type != bfd_link_hash_defined)
194 *cache = (h->u.def.value
195 + h->u.def.section->output_section->vma
196 + h->u.def.section->output_offset);
201 mep_tpoff_base (bfd_vma ofs)
203 static bfd_vma cache = 0;
204 return mep_lookup_global ("__tpbase", ofs, &cache, &warn_tp);
208 mep_sdaoff_base (bfd_vma ofs)
210 static bfd_vma cache = 0;
211 return mep_lookup_global ("__sdabase", ofs, &cache, &warn_sda);
214 static bfd_reloc_status_type
215 mep_final_link_relocate
216 (reloc_howto_type * howto,
218 asection * input_section,
220 Elf_Internal_Rela * rel,
227 bfd_reloc_status_type r = bfd_reloc_ok;
230 if (bfd_big_endian (input_bfd))
241 pc = (input_section->output_section->vma
242 + input_section->output_offset
245 s = relocation + rel->r_addend;
247 byte = (unsigned char *)contents + rel->r_offset;
249 if (howto->type == R_MEP_PCREL24A2
253 /* This is an unreachable branch to an undefined weak function.
254 Silently ignore it, since the opcode can't do that but should
255 never be executed anyway. */
259 if (howto->pc_relative)
262 u = (unsigned long) s;
267 /* This section generated from bfd/mep-relocs.pl from include/elf/mep.h. */
268 case R_MEP_8: /* 76543210 */
269 if (u > 255) r = bfd_reloc_overflow;
270 byte[0] = (u & 0xff);
272 case R_MEP_16: /* fedcba9876543210 */
273 if (u > 65535) r = bfd_reloc_overflow;
274 byte[0^e2] = ((u >> 8) & 0xff);
275 byte[1^e2] = (u & 0xff);
277 case R_MEP_32: /* vutsrqponmlkjihgfedcba9876543210 */
278 byte[0^e4] = ((u >> 24) & 0xff);
279 byte[1^e4] = ((u >> 16) & 0xff);
280 byte[2^e4] = ((u >> 8) & 0xff);
281 byte[3^e4] = (u & 0xff);
283 case R_MEP_PCREL8A2: /* --------7654321- */
284 if (-128 > s || s > 127) r = bfd_reloc_overflow;
285 byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
287 case R_MEP_PCREL12A2: /* ----ba987654321- */
288 if (-2048 > s || s > 2047) r = bfd_reloc_overflow;
289 byte[0^e2] = (byte[0^e2] & 0xf0) | ((s >> 8) & 0x0f);
290 byte[1^e2] = (byte[1^e2] & 0x01) | (s & 0xfe);
292 case R_MEP_PCREL17A2: /* ----------------gfedcba987654321 */
293 if (-65536 > s || s > 65535) r = bfd_reloc_overflow;
294 byte[2^e2] = ((s >> 9) & 0xff);
295 byte[3^e2] = ((s >> 1) & 0xff);
297 case R_MEP_PCREL24A2: /* -----7654321----nmlkjihgfedcba98 */
298 if (-8388608 > s || s > 8388607) r = bfd_reloc_overflow;
299 byte[0^e2] = (byte[0^e2] & 0xf8) | ((s >> 5) & 0x07);
300 byte[1^e2] = (byte[1^e2] & 0x0f) | ((s << 3) & 0xf0);
301 byte[2^e2] = ((s >> 16) & 0xff);
302 byte[3^e2] = ((s >> 8) & 0xff);
304 case R_MEP_PCABS24A2: /* -----7654321----nmlkjihgfedcba98 */
305 if (u > 16777215) r = bfd_reloc_overflow;
306 byte[0^e2] = (byte[0^e2] & 0xf8) | ((u >> 5) & 0x07);
307 byte[1^e2] = (byte[1^e2] & 0x0f) | ((u << 3) & 0xf0);
308 byte[2^e2] = ((u >> 16) & 0xff);
309 byte[3^e2] = ((u >> 8) & 0xff);
311 case R_MEP_LOW16: /* ----------------fedcba9876543210 */
312 byte[2^e2] = ((u >> 8) & 0xff);
313 byte[3^e2] = (u & 0xff);
315 case R_MEP_HI16U: /* ----------------vutsrqponmlkjihg */
316 byte[2^e2] = ((u >> 24) & 0xff);
317 byte[3^e2] = ((u >> 16) & 0xff);
319 case R_MEP_HI16S: /* ----------------vutsrqponmlkjihg */
322 byte[2^e2] = ((s >> 24) & 0xff);
323 byte[3^e2] = ((s >> 16) & 0xff);
325 case R_MEP_GPREL: /* ----------------fedcba9876543210 */
326 s -= mep_sdaoff_base(rel->r_offset);
327 if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
328 byte[2^e2] = ((s >> 8) & 0xff);
329 byte[3^e2] = (s & 0xff);
331 case R_MEP_TPREL: /* ----------------fedcba9876543210 */
332 s -= mep_tpoff_base(rel->r_offset);
333 if (-32768 > s || s > 32767) r = bfd_reloc_overflow;
334 byte[2^e2] = ((s >> 8) & 0xff);
335 byte[3^e2] = (s & 0xff);
337 case R_MEP_TPREL7: /* ---------6543210 */
338 u -= mep_tpoff_base(rel->r_offset);
339 if (u > 127) r = bfd_reloc_overflow;
340 byte[1^e2] = (byte[1^e2] & 0x80) | (u & 0x7f);
342 case R_MEP_TPREL7A2: /* ---------654321- */
343 u -= mep_tpoff_base(rel->r_offset);
344 if (u > 127) r = bfd_reloc_overflow;
345 byte[1^e2] = (byte[1^e2] & 0x81) | (u & 0x7e);
347 case R_MEP_TPREL7A4: /* ---------65432-- */
348 u -= mep_tpoff_base(rel->r_offset);
349 if (u > 127) r = bfd_reloc_overflow;
350 byte[1^e2] = (byte[1^e2] & 0x83) | (u & 0x7c);
352 case R_MEP_UIMM24: /* --------76543210nmlkjihgfedcba98 */
353 if (u > 16777215) r = bfd_reloc_overflow;
354 byte[1^e2] = (u & 0xff);
355 byte[2^e2] = ((u >> 16) & 0xff);
356 byte[3^e2] = ((u >> 8) & 0xff);
358 case R_MEP_ADDR24A4: /* --------765432--nmlkjihgfedcba98 */
359 if (u > 16777215) r = bfd_reloc_overflow;
360 byte[1^e2] = (byte[1^e2] & 0x03) | (u & 0xfc);
361 byte[2^e2] = ((u >> 16) & 0xff);
362 byte[3^e2] = ((u >> 8) & 0xff);
364 case R_MEP_GNU_VTINHERIT: /* ---------------- */
366 case R_MEP_GNU_VTENTRY: /* ---------------- */
376 /* Set the howto pointer for a MEP ELF reloc. */
379 mep_info_to_howto_rela
380 (bfd * abfd ATTRIBUTE_UNUSED,
382 Elf_Internal_Rela * dst)
386 r_type = ELF32_R_TYPE (dst->r_info);
387 if (r_type >= R_MEP_max)
389 /* xgettext:c-format */
390 _bfd_error_handler (_("%B: invalid MEP reloc number: %d"), abfd, r_type);
393 cache_ptr->howto = & mep_elf_howto_table [r_type];
396 /* Relocate a MEP ELF section.
397 There is some attempt to make this function usable for many architectures,
398 both USE_REL and USE_RELA ['twould be nice if such a critter existed],
399 if only to serve as a learning tool.
401 The RELOCATE_SECTION function is called by the new ELF backend linker
402 to handle the relocations for a section.
404 The relocs are always passed as Rela structures; if the section
405 actually uses Rel structures, the r_addend field will always be
408 This function is responsible for adjusting the section contents as
409 necessary, and (if using Rela relocs and generating a relocatable
410 output file) adjusting the reloc addend as necessary.
412 This function does not have to worry about setting the reloc
413 address or the reloc symbol index.
415 LOCAL_SYMS is a pointer to the swapped in local symbols.
417 LOCAL_SECTIONS is an array giving the section in the input file
418 corresponding to the st_shndx field of each local symbol.
420 The global hash table entry for the global symbols can be found
421 via elf_sym_hashes (input_bfd).
423 When generating relocatable output, this function must handle
424 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
425 going to be the section symbol corresponding to the output
426 section, which means that the addend must be adjusted
430 mep_elf_relocate_section
431 (bfd * output_bfd ATTRIBUTE_UNUSED,
432 struct bfd_link_info * info,
434 asection * input_section,
436 Elf_Internal_Rela * relocs,
437 Elf_Internal_Sym * local_syms,
438 asection ** local_sections)
440 Elf_Internal_Shdr * symtab_hdr;
441 struct elf_link_hash_entry ** sym_hashes;
442 Elf_Internal_Rela * rel;
443 Elf_Internal_Rela * relend;
445 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
446 sym_hashes = elf_sym_hashes (input_bfd);
447 relend = relocs + input_section->reloc_count;
451 for (rel = relocs; rel < relend; rel ++)
453 reloc_howto_type * howto;
454 unsigned long r_symndx;
455 Elf_Internal_Sym * sym;
457 struct elf_link_hash_entry * h;
459 bfd_reloc_status_type r;
460 const char * name = NULL;
463 r_type = ELF32_R_TYPE (rel->r_info);
464 r_symndx = ELF32_R_SYM (rel->r_info);
465 howto = mep_elf_howto_table + ELF32_R_TYPE (rel->r_info);
470 if (r_symndx < symtab_hdr->sh_info)
472 sym = local_syms + r_symndx;
473 sec = local_sections [r_symndx];
474 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
476 name = bfd_elf_string_from_elf_section
477 (input_bfd, symtab_hdr->sh_link, sym->st_name);
478 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
482 bfd_boolean warned, unresolved_reloc, ignored;
484 RELOC_FOR_GLOBAL_SYMBOL(info, input_bfd, input_section, rel,
485 r_symndx, symtab_hdr, sym_hashes,
487 unresolved_reloc, warned, ignored);
489 name = h->root.root.string;
492 if (sec != NULL && discarded_section (sec))
493 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
494 rel, 1, relend, howto, 0, contents);
496 if (bfd_link_relocatable (info))
499 if (r_type == R_RELC)
500 r = bfd_elf_perform_complex_relocation (input_bfd, input_section,
501 contents, rel, relocation);
503 r = mep_final_link_relocate (howto, input_bfd, input_section,
504 contents, rel, relocation);
506 if (r != bfd_reloc_ok)
508 const char * msg = (const char *) NULL;
512 case bfd_reloc_overflow:
513 (*info->callbacks->reloc_overflow)
514 (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
515 input_bfd, input_section, rel->r_offset);
518 case bfd_reloc_undefined:
519 (*info->callbacks->undefined_symbol)
520 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
523 case bfd_reloc_outofrange:
524 msg = _("internal error: out of range error");
527 case bfd_reloc_notsupported:
528 msg = _("internal error: unsupported relocation error");
531 case bfd_reloc_dangerous:
532 msg = _("internal error: dangerous relocation");
536 msg = _("internal error: unknown error");
541 (*info->callbacks->warning) (info, msg, name, input_bfd,
542 input_section, rel->r_offset);
547 info->callbacks->undefined_symbol
548 (info, "__tpbase", input_bfd, input_section, warn_tp-1, TRUE);
550 info->callbacks->undefined_symbol
551 (info, "__sdabase", input_bfd, input_section, warn_sda-1, TRUE);
552 if (warn_sda || warn_tp)
558 /* Function to set the ELF flag bits. */
561 mep_elf_set_private_flags (bfd * abfd,
564 elf_elfheader (abfd)->e_flags = flags;
565 elf_flags_init (abfd) = TRUE;
569 /* Merge backend specific data from an object file to the output
570 object file when linking. */
573 mep_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
575 bfd *obfd = info->output_bfd;
576 static bfd *last_ibfd = 0;
577 flagword old_flags, new_flags;
578 flagword old_partial, new_partial;
580 /* Check if we have the same endianness. */
581 if (!_bfd_generic_verify_endian_match (ibfd, info))
584 new_flags = elf_elfheader (ibfd)->e_flags;
585 old_flags = elf_elfheader (obfd)->e_flags;
588 _bfd_error_handler ("%B: old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s",
589 ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no");
592 /* First call, no flags set. */
593 if (!elf_flags_init (obfd))
595 elf_flags_init (obfd) = TRUE;
596 old_flags = new_flags;
598 else if ((new_flags | old_flags) & EF_MEP_LIBRARY)
600 /* Non-library flags trump library flags. The choice doesn't really
601 matter if both OLD_FLAGS and NEW_FLAGS have EF_MEP_LIBRARY set. */
602 if (old_flags & EF_MEP_LIBRARY)
603 old_flags = new_flags;
607 /* Make sure they're for the same mach. Allow upgrade from the "mep"
609 new_partial = (new_flags & EF_MEP_CPU_MASK);
610 old_partial = (old_flags & EF_MEP_CPU_MASK);
611 if (new_partial == old_partial)
613 else if (new_partial == EF_MEP_CPU_MEP)
615 else if (old_partial == EF_MEP_CPU_MEP)
616 old_flags = (old_flags & ~EF_MEP_CPU_MASK) | new_partial;
619 /* xgettext:c-format */
620 _bfd_error_handler (_("%B and %B are for different cores"), last_ibfd, ibfd);
621 bfd_set_error (bfd_error_invalid_target);
625 /* Make sure they're for the same me_module. Allow basic config to
626 mix with any other. */
627 new_partial = (new_flags & EF_MEP_INDEX_MASK);
628 old_partial = (old_flags & EF_MEP_INDEX_MASK);
629 if (new_partial == old_partial)
631 else if (new_partial == 0)
633 else if (old_partial == 0)
634 old_flags = (old_flags & ~EF_MEP_INDEX_MASK) | new_partial;
637 /* xgettext:c-format */
638 _bfd_error_handler (_("%B and %B are for different configurations"), last_ibfd, ibfd);
639 bfd_set_error (bfd_error_invalid_target);
644 elf_elfheader (obfd)->e_flags = old_flags;
649 /* This will be edited by the MeP configration tool. */
650 static const char * config_names[] =
653 /* start-mepcfgtool */
658 static const char * core_names[] =
660 "MeP", "MeP-c2", "MeP-c3", "MeP-h1"
664 mep_elf_print_private_bfd_data (bfd * abfd, void * ptr)
666 FILE * file = (FILE *) ptr;
667 flagword flags, partial_flags;
669 BFD_ASSERT (abfd != NULL && ptr != NULL);
671 /* Print normal ELF private data. */
672 _bfd_elf_print_private_bfd_data (abfd, ptr);
674 flags = elf_elfheader (abfd)->e_flags;
675 fprintf (file, _("private flags = 0x%lx"), (unsigned long) flags);
677 partial_flags = (flags & EF_MEP_CPU_MASK) >> 24;
678 if (partial_flags < ARRAY_SIZE (core_names))
679 fprintf (file, " core: %s", core_names[(long)partial_flags]);
681 partial_flags = flags & EF_MEP_INDEX_MASK;
682 if (partial_flags < ARRAY_SIZE (config_names))
683 fprintf (file, " me_module: %s", config_names[(long)partial_flags]);
690 /* Return the machine subcode from the ELF e_flags header. */
693 elf32_mep_machine (bfd * abfd)
695 switch (elf_elfheader (abfd)->e_flags & EF_MEP_CPU_MASK)
698 case EF_MEP_CPU_C2: return bfd_mach_mep;
699 case EF_MEP_CPU_C3: return bfd_mach_mep;
700 case EF_MEP_CPU_C4: return bfd_mach_mep;
701 case EF_MEP_CPU_C5: return bfd_mach_mep_c5;
702 case EF_MEP_CPU_H1: return bfd_mach_mep_h1;
709 mep_elf_object_p (bfd * abfd)
711 bfd_default_set_arch_mach (abfd, bfd_arch_mep, elf32_mep_machine (abfd));
716 mep_elf_section_flags (flagword * flags, const Elf_Internal_Shdr * hdr)
718 if (hdr->sh_flags & SHF_MEP_VLIW)
719 * flags |= SEC_MEP_VLIW;
724 mep_elf_fake_sections (bfd * abfd ATTRIBUTE_UNUSED,
725 Elf_Internal_Shdr * hdr,
728 if (sec->flags & SEC_MEP_VLIW)
729 hdr->sh_flags |= SHF_MEP_VLIW;
734 #define ELF_ARCH bfd_arch_mep
735 #define ELF_MACHINE_CODE EM_CYGNUS_MEP
736 #define ELF_MAXPAGESIZE 0x1000
738 #define TARGET_BIG_SYM mep_elf32_vec
739 #define TARGET_BIG_NAME "elf32-mep"
741 #define TARGET_LITTLE_SYM mep_elf32_le_vec
742 #define TARGET_LITTLE_NAME "elf32-mep-little"
744 #define elf_info_to_howto_rel NULL
745 #define elf_info_to_howto mep_info_to_howto_rela
746 #define elf_backend_relocate_section mep_elf_relocate_section
747 #define elf_backend_object_p mep_elf_object_p
748 #define elf_backend_section_flags mep_elf_section_flags
749 #define elf_backend_fake_sections mep_elf_fake_sections
751 #define bfd_elf32_bfd_reloc_type_lookup mep_reloc_type_lookup
752 #define bfd_elf32_bfd_reloc_name_lookup mep_reloc_name_lookup
753 #define bfd_elf32_bfd_set_private_flags mep_elf_set_private_flags
754 #define bfd_elf32_bfd_merge_private_bfd_data mep_elf_merge_private_bfd_data
755 #define bfd_elf32_bfd_print_private_bfd_data mep_elf_print_private_bfd_data
757 #define elf_backend_rela_normal 1
759 #include "elf32-target.h"