/* FR30-specific support for 32-bit ELF. Copyright (C) 1998-2018 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "sysdep.h" #include "bfd.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/fr30.h" /* Forward declarations. */ static bfd_reloc_status_type fr30_elf_i20_reloc (bfd *, arelent *, asymbol *, void * data, asection *, bfd *, char **error_message); static bfd_reloc_status_type fr30_elf_i32_reloc (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); static reloc_howto_type fr30_elf_howto_table [] = { /* This reloc does nothing. */ HOWTO (R_FR30_NONE, /* type */ 0, /* rightshift */ 3, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_FR30_NONE", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* An 8 bit absolute relocation. */ HOWTO (R_FR30_8, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ FALSE, /* pc_relative */ 4, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_FR30_8", /* name */ FALSE, /* partial_inplace */ 0x0000, /* src_mask */ 0x0ff0, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 20 bit absolute relocation. */ HOWTO (R_FR30_20, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 20, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ fr30_elf_i20_reloc, /* special_function */ "R_FR30_20", /* name */ FALSE, /* partial_inplace */ 0x00000000, /* src_mask */ 0x00f0ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 32 bit absolute relocation. */ HOWTO (R_FR30_32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_FR30_32", /* name */ FALSE, /* partial_inplace */ 0x00000000, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 32 bit into 48 bits absolute relocation. */ HOWTO (R_FR30_48, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ fr30_elf_i32_reloc, /* special_function */ "R_FR30_48", /* name */ FALSE, /* partial_inplace */ 0x00000000, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 6 bit absolute relocation. */ HOWTO (R_FR30_6_IN_4, /* type */ 2, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 6, /* bitsize */ FALSE, /* pc_relative */ 4, /* bitpos */ complain_overflow_unsigned, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_FR30_6_IN_4", /* name */ FALSE, /* partial_inplace */ 0x0000, /* src_mask */ 0x00f0, /* dst_mask */ FALSE), /* pcrel_offset */ /* An 8 bit absolute relocation. */ HOWTO (R_FR30_8_IN_8, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ FALSE, /* pc_relative */ 4, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ bfd_elf_generic_reloc,/* special_function */ "R_FR30_8_IN_8", /* name */ FALSE, /* partial_inplace */ 0x0000, /* src_mask */ 0x0ff0, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 9 bit absolute relocation. */ HOWTO (R_FR30_9_IN_8, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 9, /* bitsize */ FALSE, /* pc_relative */ 4, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ bfd_elf_generic_reloc,/* special_function */ "R_FR30_9_IN_8", /* name */ FALSE, /* partial_inplace */ 0x0000, /* src_mask */ 0x0ff0, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 10 bit absolute relocation. */ HOWTO (R_FR30_10_IN_8, /* type */ 2, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 10, /* bitsize */ FALSE, /* pc_relative */ 4, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ bfd_elf_generic_reloc,/* special_function */ "R_FR30_10_IN_8", /* name */ FALSE, /* partial_inplace */ 0x0000, /* src_mask */ 0x0ff0, /* dst_mask */ FALSE), /* pcrel_offset */ /* A PC relative 9 bit relocation, right shifted by 1. */ HOWTO (R_FR30_9_PCREL, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 9, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_FR30_9_PCREL", /* name */ FALSE, /* partial_inplace */ 0x0000, /* src_mask */ 0x00ff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A PC relative 12 bit relocation, right shifted by 1. */ HOWTO (R_FR30_12_PCREL, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 12, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_FR30_12_PCREL", /* name */ FALSE, /* partial_inplace */ 0x0000, /* src_mask */ 0x07ff, /* dst_mask */ FALSE), /* pcrel_offset */ /* GNU extension to record C++ vtable hierarchy */ HOWTO (R_FR30_GNU_VTINHERIT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ NULL, /* special_function */ "R_FR30_GNU_VTINHERIT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* GNU extension to record C++ vtable member usage */ HOWTO (R_FR30_GNU_VTENTRY, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_elf_rel_vtable_reloc_fn, /* special_function */ "R_FR30_GNU_VTENTRY", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ }; /* Utility to actually perform an R_FR30_20 reloc. */ static bfd_reloc_status_type fr30_elf_i20_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, void * data, asection *input_section, bfd *output_bfd, char **error_message ATTRIBUTE_UNUSED) { bfd_vma relocation; unsigned long x; /* This part is from bfd_elf_generic_reloc. */ if (output_bfd != (bfd *) NULL && (symbol->flags & BSF_SECTION_SYM) == 0 && (! reloc_entry->howto->partial_inplace || reloc_entry->addend == 0)) { reloc_entry->address += input_section->output_offset; return bfd_reloc_ok; } if (output_bfd != NULL) /* FIXME: See bfd_perform_relocation. Is this right? */ return bfd_reloc_ok; relocation = symbol->value + symbol->section->output_section->vma + symbol->section->output_offset + reloc_entry->addend; if (relocation > (((bfd_vma) 1 << 20) - 1)) return bfd_reloc_overflow; x = bfd_get_32 (abfd, (char *) data + reloc_entry->address); x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4); bfd_put_32 (abfd, (bfd_vma) x, (char *) data + reloc_entry->address); return bfd_reloc_ok; } /* Utility to actually perform a R_FR30_48 reloc. */ static bfd_reloc_status_type fr30_elf_i32_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, void * data, asection *input_section, bfd *output_bfd, char **error_message ATTRIBUTE_UNUSED) { bfd_vma relocation; /* This part is from bfd_elf_generic_reloc. */ if (output_bfd != (bfd *) NULL && (symbol->flags & BSF_SECTION_SYM) == 0 && (! reloc_entry->howto->partial_inplace || reloc_entry->addend == 0)) { reloc_entry->address += input_section->output_offset; return bfd_reloc_ok; } if (output_bfd != NULL) /* FIXME: See bfd_perform_relocation. Is this right? */ return bfd_reloc_ok; relocation = symbol->value + symbol->section->output_section->vma + symbol->section->output_offset + reloc_entry->addend; bfd_put_32 (abfd, relocation, (char *) data + reloc_entry->address + 2); return bfd_reloc_ok; } /* Map BFD reloc types to FR30 ELF reloc types. */ struct fr30_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned int fr30_reloc_val; }; static const struct fr30_reloc_map fr30_reloc_map [] = { { BFD_RELOC_NONE, R_FR30_NONE }, { BFD_RELOC_8, R_FR30_8 }, { BFD_RELOC_FR30_20, R_FR30_20 }, { BFD_RELOC_32, R_FR30_32 }, { BFD_RELOC_FR30_48, R_FR30_48 }, { BFD_RELOC_FR30_6_IN_4, R_FR30_6_IN_4 }, { BFD_RELOC_FR30_8_IN_8, R_FR30_8_IN_8 }, { BFD_RELOC_FR30_9_IN_8, R_FR30_9_IN_8 }, { BFD_RELOC_FR30_10_IN_8, R_FR30_10_IN_8 }, { BFD_RELOC_FR30_9_PCREL, R_FR30_9_PCREL }, { BFD_RELOC_FR30_12_PCREL, R_FR30_12_PCREL }, { BFD_RELOC_VTABLE_INHERIT, R_FR30_GNU_VTINHERIT }, { BFD_RELOC_VTABLE_ENTRY, R_FR30_GNU_VTENTRY }, }; static reloc_howto_type * fr30_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) { unsigned int i; for (i = sizeof (fr30_reloc_map) / sizeof (fr30_reloc_map[0]); i--;) if (fr30_reloc_map [i].bfd_reloc_val == code) return & fr30_elf_howto_table [fr30_reloc_map[i].fr30_reloc_val]; return NULL; } static reloc_howto_type * fr30_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) { unsigned int i; for (i = 0; i < sizeof (fr30_elf_howto_table) / sizeof (fr30_elf_howto_table[0]); i++) if (fr30_elf_howto_table[i].name != NULL && strcasecmp (fr30_elf_howto_table[i].name, r_name) == 0) return &fr30_elf_howto_table[i]; return NULL; } /* Set the howto pointer for an FR30 ELF reloc. */ static void fr30_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, Elf_Internal_Rela *dst) { unsigned int r_type; r_type = ELF32_R_TYPE (dst->r_info); if (r_type >= (unsigned int) R_FR30_max) { /* xgettext:c-format */ _bfd_error_handler (_("%pB: unsupported relocation type %#x"), abfd, r_type); r_type = 0; } cache_ptr->howto = & fr30_elf_howto_table [r_type]; } /* Perform a single relocation. By default we use the standard BFD routines, but a few relocs, we have to do them ourselves. */ static bfd_reloc_status_type fr30_final_link_relocate (reloc_howto_type *howto, bfd *input_bfd, asection *input_section, bfd_byte *contents, Elf_Internal_Rela *rel, bfd_vma relocation) { bfd_reloc_status_type r = bfd_reloc_ok; bfd_vma x; bfd_signed_vma srel; switch (howto->type) { case R_FR30_20: contents += rel->r_offset; relocation += rel->r_addend; if (relocation > ((1 << 20) - 1)) return bfd_reloc_overflow; x = bfd_get_32 (input_bfd, contents); x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4); bfd_put_32 (input_bfd, x, contents); break; case R_FR30_48: contents += rel->r_offset + 2; relocation += rel->r_addend; bfd_put_32 (input_bfd, relocation, contents); break; case R_FR30_9_PCREL: contents += rel->r_offset + 1; srel = (bfd_signed_vma) relocation; srel += rel->r_addend; srel -= rel->r_offset; srel -= 2; /* Branch instructions add 2 to the PC... */ srel -= (input_section->output_section->vma + input_section->output_offset); if (srel & 1) return bfd_reloc_outofrange; if (srel > ((1 << 8) - 1) || (srel < - (1 << 8))) return bfd_reloc_overflow; bfd_put_8 (input_bfd, srel >> 1, contents); break; case R_FR30_12_PCREL: contents += rel->r_offset; srel = (bfd_signed_vma) relocation; srel += rel->r_addend; srel -= rel->r_offset; srel -= 2; /* Branch instructions add 2 to the PC... */ srel -= (input_section->output_section->vma + input_section->output_offset); if (srel & 1) return bfd_reloc_outofrange; if (srel > ((1 << 11) - 1) || (srel < - (1 << 11))) return bfd_reloc_overflow; x = bfd_get_16 (input_bfd, contents); x = (x & 0xf800) | ((srel >> 1) & 0x7ff); bfd_put_16 (input_bfd, x, contents); break; default: r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend); } return r; } /* Relocate an FR30 ELF section. The RELOCATE_SECTION function is called by the new ELF backend linker to handle the relocations for a section. The relocs are always passed as Rela structures; if the section actually uses Rel structures, the r_addend field will always be zero. This function is responsible for adjusting the section contents as necessary, and (if using Rela relocs and generating a relocatable output file) adjusting the reloc addend as necessary. This function does not have to worry about setting the reloc address or the reloc symbol index. LOCAL_SYMS is a pointer to the swapped in local symbols. LOCAL_SECTIONS is an array giving the section in the input file corresponding to the st_shndx field of each local symbol. The global hash table entry for the global symbols can be found via elf_sym_hashes (input_bfd). When generating relocatable output, this function must handle STB_LOCAL/STT_SECTION symbols specially. The output symbol is going to be the section symbol corresponding to the output section, which means that the addend must be adjusted accordingly. */ static bfd_boolean fr30_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, Elf_Internal_Sym *local_syms, asection **local_sections) { Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; Elf_Internal_Rela *rel; Elf_Internal_Rela *relend; symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; sym_hashes = elf_sym_hashes (input_bfd); relend = relocs + input_section->reloc_count; for (rel = relocs; rel < relend; rel ++) { reloc_howto_type *howto; unsigned long r_symndx; Elf_Internal_Sym *sym; asection *sec; struct elf_link_hash_entry *h; bfd_vma relocation; bfd_reloc_status_type r; const char *name; int r_type; r_type = ELF32_R_TYPE (rel->r_info); if ( r_type == R_FR30_GNU_VTINHERIT || r_type == R_FR30_GNU_VTENTRY) continue; r_symndx = ELF32_R_SYM (rel->r_info); howto = fr30_elf_howto_table + ELF32_R_TYPE (rel->r_info); h = NULL; sym = NULL; sec = NULL; if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; sec = local_sections [r_symndx]; relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, sym->st_name); name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; } else { bfd_boolean unresolved_reloc, warned, ignored; RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, r_symndx, symtab_hdr, sym_hashes, h, sec, relocation, unresolved_reloc, warned, ignored); name = h->root.root.string; } if (sec != NULL && discarded_section (sec)) RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, rel, 1, relend, howto, 0, contents); if (bfd_link_relocatable (info)) continue; r = fr30_final_link_relocate (howto, input_bfd, input_section, contents, rel, relocation); if (r != bfd_reloc_ok) { const char * msg = (const char *) NULL; switch (r) { case bfd_reloc_overflow: (*info->callbacks->reloc_overflow) (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0, input_bfd, input_section, rel->r_offset); break; case bfd_reloc_undefined: (*info->callbacks->undefined_symbol) (info, name, input_bfd, input_section, rel->r_offset, TRUE); break; case bfd_reloc_outofrange: msg = _("internal error: out of range error"); break; case bfd_reloc_notsupported: msg = _("internal error: unsupported relocation error"); break; case bfd_reloc_dangerous: msg = _("internal error: dangerous relocation"); break; default: msg = _("internal error: unknown error"); break; } if (msg) (*info->callbacks->warning) (info, msg, name, input_bfd, input_section, rel->r_offset); } } return TRUE; } /* Return the section that should be marked against GC for a given relocation. */ static asection * fr30_elf_gc_mark_hook (asection *sec, struct bfd_link_info *info, Elf_Internal_Rela *rel, struct elf_link_hash_entry *h, Elf_Internal_Sym *sym) { if (h != NULL) switch (ELF32_R_TYPE (rel->r_info)) { case R_FR30_GNU_VTINHERIT: case R_FR30_GNU_VTENTRY: return NULL; } return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); } /* Look through the relocs for a section during the first phase. Since we don't do .gots or .plts, we just need to consider the virtual table relocs for gc. */ static bfd_boolean fr30_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, const Elf_Internal_Rela *relocs) { Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; const Elf_Internal_Rela *rel; const Elf_Internal_Rela *rel_end; if (bfd_link_relocatable (info)) return TRUE; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); rel_end = relocs + sec->reloc_count; for (rel = relocs; rel < rel_end; rel++) { struct elf_link_hash_entry *h; unsigned long r_symndx; r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx < symtab_hdr->sh_info) h = NULL; else { h = sym_hashes[r_symndx - symtab_hdr->sh_info]; while (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) h = (struct elf_link_hash_entry *) h->root.u.i.link; } switch (ELF32_R_TYPE (rel->r_info)) { /* This relocation describes the C++ object vtable hierarchy. Reconstruct it for later use during GC. */ case R_FR30_GNU_VTINHERIT: if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) return FALSE; break; /* This relocation describes which C++ vtable entries are actually used. Record for later use during GC. */ case R_FR30_GNU_VTENTRY: BFD_ASSERT (h != NULL); if (h != NULL && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) return FALSE; break; } } return TRUE; } #define ELF_ARCH bfd_arch_fr30 #define ELF_MACHINE_CODE EM_FR30 #define ELF_MACHINE_ALT1 EM_CYGNUS_FR30 #define ELF_MAXPAGESIZE 0x1000 #define TARGET_BIG_SYM fr30_elf32_vec #define TARGET_BIG_NAME "elf32-fr30" #define elf_info_to_howto_rel NULL #define elf_info_to_howto fr30_info_to_howto_rela #define elf_backend_relocate_section fr30_elf_relocate_section #define elf_backend_gc_mark_hook fr30_elf_gc_mark_hook #define elf_backend_check_relocs fr30_elf_check_relocs #define elf_backend_can_gc_sections 1 #define elf_backend_rela_normal 1 #define bfd_elf32_bfd_reloc_type_lookup fr30_reloc_type_lookup #define bfd_elf32_bfd_reloc_name_lookup fr30_reloc_name_lookup #include "elf32-target.h"