/* moxie-specific support for 32-bit ELF. Copyright 2009, 2010, 2012 Free Software Foundation, Inc. Copied from elf32-fr30.c which is.. Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 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/moxie.h" /* Forward declarations. */ static reloc_howto_type moxie_elf_howto_table [] = { /* This reloc does nothing. */ HOWTO (R_MOXIE_NONE, /* 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_MOXIE_NONE", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 32 bit absolute relocation. */ HOWTO (R_MOXIE_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_MOXIE_32", /* name */ FALSE, /* partial_inplace */ 0x00000000, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 10 bit PC-relative relocation. */ HOWTO (R_MOXIE_PCREL10, /* type. */ 1, /* rightshift. */ 1, /* size (0 = byte, 1 = short, 2 = long). */ 10, /* bitsize. */ TRUE, /* pc_relative. */ 0, /* bitpos. */ complain_overflow_signed, /* complain_on_overflow. */ bfd_elf_generic_reloc, /* special_function. */ "R_MOXIE_PCREL10", /* name. */ FALSE, /* partial_inplace. */ 0, /* src_mask. */ 0x000003FF, /* dst_mask. */ TRUE), /* pcrel_offset. */ }; /* Map BFD reloc types to MOXIE ELF reloc types. */ struct moxie_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned int moxie_reloc_val; }; static const struct moxie_reloc_map moxie_reloc_map [] = { { BFD_RELOC_NONE, R_MOXIE_NONE }, { BFD_RELOC_32, R_MOXIE_32 }, { BFD_RELOC_MOXIE_10_PCREL, R_MOXIE_PCREL10 }, }; static reloc_howto_type * moxie_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) { unsigned int i; for (i = sizeof (moxie_reloc_map) / sizeof (moxie_reloc_map[0]); --i;) if (moxie_reloc_map [i].bfd_reloc_val == code) return & moxie_elf_howto_table [moxie_reloc_map[i].moxie_reloc_val]; return NULL; } static reloc_howto_type * moxie_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) { unsigned int i; for (i = 0; i < sizeof (moxie_elf_howto_table) / sizeof (moxie_elf_howto_table[0]); i++) if (moxie_elf_howto_table[i].name != NULL && strcasecmp (moxie_elf_howto_table[i].name, r_name) == 0) return &moxie_elf_howto_table[i]; return NULL; } /* Set the howto pointer for an MOXIE ELF reloc. */ static void moxie_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); BFD_ASSERT (r_type < (unsigned int) R_MOXIE_max); cache_ptr->howto = & moxie_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 moxie_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; switch (howto->type) { default: r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend); } return r; } /* Relocate an MOXIE 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 moxie_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); r_symndx = ELF32_R_SYM (rel->r_info); howto = moxie_elf_howto_table + r_type; 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; RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, r_symndx, symtab_hdr, sym_hashes, h, sec, relocation, unresolved_reloc, warned); 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 (info->relocatable) continue; r = moxie_final_link_relocate (howto, input_bfd, input_section, contents, rel, relocation); if (r != bfd_reloc_ok) { const char * msg = NULL; switch (r) { case bfd_reloc_overflow: r = 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: r = 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) r = info->callbacks->warning (info, msg, name, input_bfd, input_section, rel->r_offset); if (! r) return FALSE; } } return TRUE; } /* Return the section that should be marked against GC for a given relocation. */ static asection * moxie_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) { 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 moxie_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 (info->relocatable) 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; /* PR15323, ref flags aren't set for references in the same object. */ h->root.non_ir_ref = 1; } } return TRUE; } #define ELF_ARCH bfd_arch_moxie #define ELF_MACHINE_CODE EM_MOXIE #define ELF_MAXPAGESIZE 0x1 #define TARGET_BIG_SYM bfd_elf32_bigmoxie_vec #define TARGET_BIG_NAME "elf32-bigmoxie" #define TARGET_LITTLE_SYM bfd_elf32_littlemoxie_vec #define TARGET_LITTLE_NAME "elf32-littlemoxie" #define elf_info_to_howto_rel NULL #define elf_info_to_howto moxie_info_to_howto_rela #define elf_backend_relocate_section moxie_elf_relocate_section #define elf_backend_gc_mark_hook moxie_elf_gc_mark_hook #define elf_backend_check_relocs moxie_elf_check_relocs #define elf_backend_can_gc_sections 1 #define elf_backend_rela_normal 1 #define bfd_elf32_bfd_reloc_type_lookup moxie_reloc_type_lookup #define bfd_elf32_bfd_reloc_name_lookup moxie_reloc_name_lookup #include "elf32-target.h"