/* FR30-specific support for 32-bit ELF. Copyright (C) 1998 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "bfd.h" #include "sysdep.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/fr30.h" /* Forward declarations. */ static bfd_reloc_status_type fr30_elf_i20_reloc PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); static bfd_reloc_status_type fr30_elf_i32_reloc PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); static reloc_howto_type * fr30_reloc_type_lookup PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); static void fr30_info_to_howto_rela PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); static boolean fr30_elf_relocate_section PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); static bfd_reloc_status_type fr30_final_link_relocate PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma)); static reloc_howto_type fr30_elf_howto_table [] = { /* This reloc does nothing. */ HOWTO (R_FR30_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_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 */ true, /* partial_inplace */ 0x0ff0, /* 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 */ true, /* partial_inplace */ 0x00f0ffff, /* 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 */ true, /* partial_inplace */ 0xffffffff, /* 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_32", /* name */ true, /* partial_inplace */ 0xffffffff, /* 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 */ true, /* partial_inplace */ 0x00f0, /* 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 */ true, /* partial_inplace */ 0x0ff0, /* 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 */ true, /* partial_inplace */ 0x0ff0, /* 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 */ true, /* partial_inplace */ 0x0ff0, /* 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 */ 0x00ff, /* 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 */ 0x07ff, /* src_mask */ 0x07ff, /* dst_mask */ false), /* pcrel_offset */ }; /* Utility to actually perform an R_FR30_20 reloc. */ static bfd_reloc_status_type fr30_elf_i20_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message) bfd * abfd; arelent * reloc_entry; asymbol * symbol; PTR data; asection * input_section; bfd * output_bfd; char ** error_message; { 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 > ((1U << 20) - 1)) return bfd_reloc_overflow; x = bfd_get_32 (abfd, data + reloc_entry->address); x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4); bfd_put_32 (abfd, x, 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 (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message) bfd * abfd; arelent * reloc_entry; asymbol * symbol; PTR data; asection * input_section; bfd * output_bfd; char ** error_message; { 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, data + reloc_entry->address + 2); return bfd_reloc_ok; } /* Map BFD reloc types to FR30 ELF reloc types. */ struct fr30_reloc_map { unsigned int 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 }, }; static reloc_howto_type * fr30_reloc_type_lookup (abfd, code) bfd * abfd; 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; } /* Set the howto pointer for an FR30 ELF reloc. */ static void fr30_info_to_howto_rela (abfd, cache_ptr, dst) bfd * abfd; arelent * cache_ptr; Elf32_Internal_Rela * dst; { unsigned int r_type; r_type = ELF32_R_TYPE (dst->r_info); BFD_ASSERT (r_type < (unsigned int) R_FR30_max); 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 (howto, input_bfd, input_section, contents, rel, relocation) 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, relocation, 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; relocation += rel->r_addend; srel = (bfd_signed_vma) relocation; 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; relocation += rel->r_addend; srel = (bfd_signed_vma) relocation; 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. There is some attempt to make this function usable for many architectures, both USE_REL and USE_RELA ['twould be nice if such a critter existed], if only to serve as a learning tool. 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 relocateable 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 relocateable 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 boolean fr30_elf_relocate_section (output_bfd, info, input_bfd, input_section, contents, relocs, local_syms, local_sections) 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 = NULL; r_symndx = ELF32_R_SYM (rel->r_info); if (info->relocateable) { /* This is a relocateable link. We don't have to change anything, unless the reloc is against a section symbol, in which case we have to adjust according to where the section symbol winds up in the output section. */ if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) { sec = local_sections [r_symndx]; rel->r_addend += sec->output_offset + sym->st_value; } } continue; } /* This is a final link. */ 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 = (sec->output_section->vma + sec->output_offset + sym->st_value); 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; #if 0 fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n", sec->name, name, sym->st_name, sec->output_section->vma, sec->output_offset, sym->st_value, rel->r_addend); #endif } 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; name = h->root.root.string; if (h->root.type == bfd_link_hash_defined || h->root.type == bfd_link_hash_defweak) { sec = h->root.u.def.section; relocation = (h->root.u.def.value + sec->output_section->vma + sec->output_offset); #if 0 fprintf (stderr, "defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n", sec->name, name, h->root.u.def.value, sec->output_section->vma, sec->output_offset, relocation); #endif } else if (h->root.type == bfd_link_hash_undefweak) { #if 0 fprintf (stderr, "undefined: sec: %s, name: %s\n", sec->name, name); #endif relocation = 0; } else { if (! ((*info->callbacks->undefined_symbol) (info, h->root.root.string, input_bfd, input_section, rel->r_offset))) return false; #if 0 fprintf (stderr, "unknown: name: %s\n", name); #endif relocation = 0; } } 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: r = info->callbacks->reloc_overflow (info, 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); 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; } #define ELF_ARCH bfd_arch_fr30 #define ELF_MACHINE_CODE EM_CYGNUS_FR30 #define ELF_MAXPAGESIZE 0x1000 #define TARGET_BIG_SYM bfd_elf32_fr30_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 bfd_elf32_bfd_reloc_type_lookup fr30_reloc_type_lookup #include "elf32-target.h"