1 /* OpenRISC-specific support for 32-bit ELF.
2 Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
3 Contributed by Johan Rydberg, jrydberg@opencores.org
5 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
25 #include "elf/openrisc.h"
26 #include "libiberty.h"
28 /* Forward declarations. */
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 *, Elf_Internal_Rela *));
34 static bfd_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 bfd_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 ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
45 struct elf_link_hash_entry *, Elf_Internal_Sym *));
46 static bfd_boolean openrisc_elf_check_relocs
47 PARAMS ((bfd *, struct bfd_link_info *, asection *,
48 const Elf_Internal_Rela *));
49 static bfd_boolean openrisc_elf_object_p
51 static void openrisc_elf_final_write_processing
52 PARAMS ((bfd *, bfd_boolean));
55 static reloc_howto_type openrisc_elf_howto_table[] =
57 /* This reloc does nothing. */
58 HOWTO (R_OPENRISC_NONE, /* type */
60 2, /* size (0 = byte, 1 = short, 2 = long) */
62 FALSE, /* pc_relative */
64 complain_overflow_bitfield, /* complain_on_overflow */
65 bfd_elf_generic_reloc, /* special_function */
66 "R_OPENRISC_NONE", /* name */
67 FALSE, /* partial_inplace */
70 FALSE), /* pcrel_offset */
72 /* A PC relative 26 bit relocation, right shifted by 2. */
73 HOWTO (R_OPENRISC_INSN_REL_26, /* type */
75 2, /* size (0 = byte, 1 = short, 2 = long) */
77 TRUE, /* pc_relative */
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 */
87 /* A absolute 26 bit relocation, right shifted by 2. */
88 HOWTO (R_OPENRISC_INSN_ABS_26, /* type */
90 2, /* size (0 = byte, 1 = short, 2 = long) */
92 FALSE, /* pc_relative */
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 */
102 HOWTO (R_OPENRISC_LO_16_IN_INSN, /* type */
104 1, /* size (0 = byte, 1 = short, 2 = long) */
106 FALSE, /* pc_relative */
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 */
113 0x0000ffff, /* dst_mask */
114 FALSE), /* pcrel_offset */
116 HOWTO (R_OPENRISC_HI_16_IN_INSN, /* type */
118 1, /* size (0 = byte, 1 = short, 2 = long) */
120 FALSE, /* pc_relative */
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 */
127 0x0000ffff, /* dst_mask */
128 FALSE), /* pcrel_offset */
130 /* An 8 bit absolute relocation. */
131 HOWTO (R_OPENRISC_8, /* type */
133 0, /* size (0 = byte, 1 = short, 2 = long) */
135 FALSE, /* pc_relative */
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 */
145 /* A 16 bit absolute relocation. */
146 HOWTO (R_OPENRISC_16, /* type */
148 1, /* size (0 = byte, 1 = short, 2 = long) */
150 FALSE, /* pc_relative */
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 */
160 /* A 32 bit absolute relocation. */
161 HOWTO (R_OPENRISC_32, /* type */
163 2, /* size (0 = byte, 1 = short, 2 = long) */
165 FALSE, /* pc_relative */
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 */
175 /* GNU extension to record C++ vtable hierarchy */
176 HOWTO (R_OPENRISC_GNU_VTINHERIT, /* type */
178 2, /* size (0 = byte, 1 = short, 2 = long) */
180 FALSE, /* pc_relative */
182 complain_overflow_dont, /* complain_on_overflow */
183 NULL, /* special_function */
184 "R_OPENRISC_GNU_VTINHERIT", /* name */
185 FALSE, /* partial_inplace */
188 FALSE), /* pcrel_offset */
190 /* GNU extension to record C++ vtable member usage */
191 HOWTO (R_OPENRISC_GNU_VTENTRY, /* type */
193 2, /* size (0 = byte, 1 = short, 2 = long) */
195 FALSE, /* pc_relative */
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 */
203 FALSE), /* pcrel_offset */
206 /* Map BFD reloc types to OpenRISC ELF reloc types. */
208 struct openrisc_reloc_map
210 bfd_reloc_code_real_type bfd_reloc_val;
211 unsigned int openrisc_reloc_val;
214 static const struct openrisc_reloc_map openrisc_reloc_map[] =
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 }
228 static reloc_howto_type *
229 openrisc_reloc_type_lookup (abfd, code)
230 bfd * abfd ATTRIBUTE_UNUSED;
231 bfd_reloc_code_real_type code;
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].
243 /* Set the howto pointer for an OpenRISC ELF reloc. */
246 openrisc_info_to_howto_rela (abfd, cache_ptr, dst)
247 bfd * abfd ATTRIBUTE_UNUSED;
249 Elf_Internal_Rela * dst;
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];
258 /* Perform a single relocation. By default we use the standard BFD
259 routines, but a few relocs, we have to do them ourselves. */
261 static bfd_reloc_status_type
262 openrisc_final_link_relocate (howto, input_bfd, input_section, contents, rel,
264 reloc_howto_type *howto;
266 asection *input_section;
268 Elf_Internal_Rela *rel;
271 bfd_reloc_status_type r = bfd_reloc_ok;
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);
283 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
284 contents, rel->r_offset,
285 relocation, rel->r_addend);
291 /* Relocate an OpenRISC ELF section.
293 The RELOCATE_SECTION function is called by the new ELF backend linker
294 to handle the relocations for a section.
296 The relocs are always passed as Rela structures; if the section
297 actually uses Rel structures, the r_addend field will always be
300 This function is responsible for adjusting the section contents as
301 necessary, and (if using Rela relocs and generating a relocatable
302 output file) adjusting the reloc addend as necessary.
304 This function does not have to worry about setting the reloc
305 address or the reloc symbol index.
307 LOCAL_SYMS is a pointer to the swapped in local symbols.
309 LOCAL_SECTIONS is an array giving the section in the input file
310 corresponding to the st_shndx field of each local symbol.
312 The global hash table entry for the global symbols can be found
313 via elf_sym_hashes (input_bfd).
315 When generating relocatable output, this function must handle
316 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
317 going to be the section symbol corresponding to the output
318 section, which means that the addend must be adjusted
322 openrisc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
323 contents, relocs, local_syms, local_sections)
325 struct bfd_link_info *info;
327 asection *input_section;
329 Elf_Internal_Rela *relocs;
330 Elf_Internal_Sym *local_syms;
331 asection **local_sections;
333 Elf_Internal_Shdr *symtab_hdr;
334 struct elf_link_hash_entry **sym_hashes;
335 Elf_Internal_Rela *rel;
336 Elf_Internal_Rela *relend;
338 if (info->relocatable)
341 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
342 sym_hashes = elf_sym_hashes (input_bfd);
343 relend = relocs + input_section->reloc_count;
345 for (rel = relocs; rel < relend; rel++)
347 reloc_howto_type *howto;
348 unsigned long r_symndx;
349 Elf_Internal_Sym *sym;
351 struct elf_link_hash_entry *h;
353 bfd_reloc_status_type r;
354 const char *name = NULL;
357 r_type = ELF32_R_TYPE (rel->r_info);
358 r_symndx = ELF32_R_SYM (rel->r_info);
360 if (r_type == R_OPENRISC_GNU_VTINHERIT
361 || r_type == R_OPENRISC_GNU_VTENTRY)
364 if ((unsigned int) r_type >
365 (sizeof openrisc_elf_howto_table / sizeof (reloc_howto_type)))
368 /* This is a final link. */
369 howto = openrisc_elf_howto_table + ELF32_R_TYPE (rel->r_info);
374 if (r_symndx < symtab_hdr->sh_info)
376 sym = local_syms + r_symndx;
377 sec = local_sections[r_symndx];
378 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
380 name = bfd_elf_string_from_elf_section
381 (input_bfd, symtab_hdr->sh_link, sym->st_name);
382 name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
386 bfd_boolean unresolved_reloc, warned;
388 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
389 r_symndx, symtab_hdr, sym_hashes,
391 unresolved_reloc, warned);
394 r = openrisc_final_link_relocate (howto, input_bfd, input_section,
395 contents, rel, relocation);
397 if (r != bfd_reloc_ok)
399 const char *msg = (const char *) NULL;
403 case bfd_reloc_overflow:
404 r = info->callbacks->reloc_overflow
405 (info, (h ? &h->root : NULL), name, howto->name,
406 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
409 case bfd_reloc_undefined:
410 r = info->callbacks->undefined_symbol
411 (info, name, input_bfd, input_section, rel->r_offset, TRUE);
414 case bfd_reloc_outofrange:
415 msg = _("internal error: out of range error");
418 case bfd_reloc_notsupported:
419 msg = _("internal error: unsupported relocation error");
422 case bfd_reloc_dangerous:
423 msg = _("internal error: dangerous relocation");
427 msg = _("internal error: unknown error");
432 r = info->callbacks->warning
433 (info, msg, name, input_bfd, input_section, rel->r_offset);
443 /* Return the section that should be marked against GC for a given
447 openrisc_elf_gc_mark_hook (sec, info, rel, h, sym)
449 struct bfd_link_info *info ATTRIBUTE_UNUSED;
450 Elf_Internal_Rela *rel;
451 struct elf_link_hash_entry *h;
452 Elf_Internal_Sym *sym;
456 switch (ELF32_R_TYPE (rel->r_info))
458 case R_OPENRISC_GNU_VTINHERIT:
459 case R_OPENRISC_GNU_VTENTRY:
463 switch (h->root.type)
465 case bfd_link_hash_defined:
466 case bfd_link_hash_defweak:
467 return h->root.u.def.section;
469 case bfd_link_hash_common:
470 return h->root.u.c.p->section;
478 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
483 /* Update the got entry reference counts for the section being removed. */
486 openrisc_elf_gc_sweep_hook (abfd, info, sec, relocs)
487 bfd *abfd ATTRIBUTE_UNUSED;
488 struct bfd_link_info *info ATTRIBUTE_UNUSED;
489 asection *sec ATTRIBUTE_UNUSED;
490 const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
495 /* Look through the relocs for a section during the first phase.
496 Since we don't do .gots or .plts, we just need to consider the
497 virtual table relocs for gc. */
500 openrisc_elf_check_relocs (abfd, info, sec, relocs)
502 struct bfd_link_info *info;
504 const Elf_Internal_Rela *relocs;
506 Elf_Internal_Shdr *symtab_hdr;
507 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
508 const Elf_Internal_Rela *rel;
509 const Elf_Internal_Rela *rel_end;
511 if (info->relocatable)
514 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
515 sym_hashes = elf_sym_hashes (abfd);
517 sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
518 if (!elf_bad_symtab (abfd))
519 sym_hashes_end -= symtab_hdr->sh_info;
521 rel_end = relocs + sec->reloc_count;
522 for (rel = relocs; rel < rel_end; rel++)
524 struct elf_link_hash_entry *h;
525 unsigned long r_symndx;
527 r_symndx = ELF32_R_SYM (rel->r_info);
528 if (r_symndx < symtab_hdr->sh_info)
531 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
533 switch (ELF32_R_TYPE (rel->r_info))
535 /* This relocation describes the C++ object vtable hierarchy.
536 Reconstruct it for later use during GC. */
537 case R_OPENRISC_GNU_VTINHERIT:
538 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
542 /* This relocation describes which C++ vtable entries are actually
543 used. Record for later use during GC. */
544 case R_OPENRISC_GNU_VTENTRY:
545 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
554 /* Set the right machine number. */
557 openrisc_elf_object_p (abfd)
560 switch (elf_elfheader (abfd)->e_flags & 0xf)
563 (void) bfd_default_set_arch_mach (abfd, bfd_arch_openrisc, 0);
569 /* Store the machine number in the flags field. */
572 openrisc_elf_final_write_processing (abfd, linker)
574 bfd_boolean linker ATTRIBUTE_UNUSED;
578 switch (bfd_get_mach (abfd))
585 elf_elfheader (abfd)->e_flags &= ~0xf;
586 elf_elfheader (abfd)->e_flags |= val;
590 #define ELF_ARCH bfd_arch_openrisc
591 #define ELF_MACHINE_CODE EM_OPENRISC
592 #define ELF_MACHINE_ALT1 EM_OPENRISC_OLD
593 #define ELF_MAXPAGESIZE 0x1000
595 #define TARGET_BIG_SYM bfd_elf32_openrisc_vec
596 #define TARGET_BIG_NAME "elf32-openrisc"
598 #define elf_info_to_howto_rel NULL
599 #define elf_info_to_howto openrisc_info_to_howto_rela
600 #define elf_backend_relocate_section openrisc_elf_relocate_section
601 #define elf_backend_gc_mark_hook openrisc_elf_gc_mark_hook
602 #define elf_backend_gc_sweep_hook openrisc_elf_gc_sweep_hook
603 #define elf_backend_check_relocs openrisc_elf_check_relocs
605 #define elf_backend_can_gc_sections 1
606 #define elf_backend_rela_normal 1
608 #define bfd_elf32_bfd_reloc_type_lookup openrisc_reloc_type_lookup
610 #define elf_backend_object_p openrisc_elf_object_p
611 #define elf_backend_final_write_processing openrisc_elf_final_write_processing
613 #include "elf32-target.h"