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[/] [or1k/] [trunk/] [gdb-5.3/] [bfd/] [elf32-openrisc.c] - Rev 1765
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/* OpenRISC-specific support for 32-bit ELF. Copyright 2001, 2002 Free Software Foundation, Inc. Contributed by Johan Rydberg, jrydberg@opencores.org 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/openrisc.h" #include "libiberty.h" /* Forward declarations. */ static reloc_howto_type *openrisc_reloc_type_lookup PARAMS ((bfd * , bfd_reloc_code_real_type)); static void openrisc_info_to_howto_rela PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); static boolean openrisc_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 openrisc_final_link_relocate PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma)); static boolean openrisc_elf_gc_sweep_hook PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static asection * openrisc_elf_gc_mark_hook PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *)); static boolean openrisc_elf_check_relocs PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static boolean openrisc_elf_object_p PARAMS ((bfd *)); static void openrisc_elf_final_write_processing PARAMS ((bfd *, boolean)); static reloc_howto_type openrisc_elf_howto_table[] = { /* This reloc does nothing. */ HOWTO (R_OPENRISC_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_OPENRISC_NONE", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ false), /* pcrel_offset */ /* A PC relative 26 bit relocation, right shifted by 2. */ HOWTO (R_OPENRISC_INSN_REL_26, /* type */ 2, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 26, /* bitsize */ true, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_OPENRISC_INSN_REL_26", /* name */ false, /* partial_inplace */ 0x00000000, /* src_mask */ 0x03ffffff, /* dst_mask */ false), /* pcrel_offset */ /* A absolute 26 bit relocation, right shifted by 2. */ HOWTO (R_OPENRISC_INSN_ABS_26, /* type */ 2, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 26, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_OPENRISC_INSN_ABS_26", /* name */ false, /* partial_inplace */ 0x00000000, /* src_mask */ 0x03ffffff, /* dst_mask */ false), /* pcrel_offset */ HOWTO (R_OPENRISC_LO_16_IN_INSN, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_OPENRISC_LO_16_IN_INSN", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0x0000ffff, /* dst_mask */ false), /* pcrel_offset */ HOWTO (R_OPENRISC_HI_16_IN_INSN, /* type */ 16, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_OPENRISC_HI_16_IN_INSN", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0x0000ffff, /* dst_mask */ false), /* pcrel_offset */ /* An 8 bit absolute relocation. */ HOWTO (R_OPENRISC_8, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_OPENRISC_8", /* name */ true, /* partial_inplace */ 0x0000, /* src_mask */ 0x00ff, /* dst_mask */ false), /* pcrel_offset */ /* A 16 bit absolute relocation. */ HOWTO (R_OPENRISC_16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_OPENRISC_16", /* name */ true, /* partial_inplace */ 0x00000000, /* src_mask */ 0x0000ffff, /* dst_mask */ false), /* pcrel_offset */ /* A 32 bit absolute relocation. */ HOWTO (R_OPENRISC_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_OPENRISC_32", /* name */ true, /* partial_inplace */ 0x00000000, /* src_mask */ 0xffffffff, /* dst_mask */ false), /* pcrel_offset */ /* GNU extension to record C++ vtable hierarchy */ HOWTO (R_OPENRISC_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_OPENRISC_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_OPENRISC_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_OPENRISC_GNU_VTENTRY", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ false), /* pcrel_offset */ }; /* Map BFD reloc types to OpenRISC ELF reloc types. */ struct openrisc_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned int openrisc_reloc_val; }; static const struct openrisc_reloc_map openrisc_reloc_map[] = { { BFD_RELOC_NONE, R_OPENRISC_NONE }, { BFD_RELOC_32, R_OPENRISC_32 }, { BFD_RELOC_16, R_OPENRISC_16 }, { BFD_RELOC_8, R_OPENRISC_8 }, { BFD_RELOC_OPENRISC_REL_26,R_OPENRISC_INSN_REL_26 }, { BFD_RELOC_OPENRISC_ABS_26,R_OPENRISC_INSN_ABS_26 }, { BFD_RELOC_HI16, R_OPENRISC_HI_16_IN_INSN }, { BFD_RELOC_LO16, R_OPENRISC_LO_16_IN_INSN }, { BFD_RELOC_VTABLE_INHERIT, R_OPENRISC_GNU_VTINHERIT }, { BFD_RELOC_VTABLE_ENTRY, R_OPENRISC_GNU_VTENTRY } }; static reloc_howto_type * openrisc_reloc_type_lookup (abfd, code) bfd * abfd ATTRIBUTE_UNUSED; bfd_reloc_code_real_type code; { unsigned int i; for (i = ARRAY_SIZE (openrisc_reloc_map); --i;) if (openrisc_reloc_map[i].bfd_reloc_val == code) return & openrisc_elf_howto_table[openrisc_reloc_map[i]. openrisc_reloc_val]; return NULL; } /* Set the howto pointer for an OpenRISC ELF reloc. */ static void openrisc_info_to_howto_rela (abfd, cache_ptr, dst) bfd * abfd ATTRIBUTE_UNUSED; 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_OPENRISC_max); cache_ptr->howto = & openrisc_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 openrisc_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; switch (howto->type) { case R_OPENRISC_LO_16_IN_INSN: relocation &= 0xffff; r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend); break; default: r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend); } return r; } /* Relocate an OpenRISC 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 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 openrisc_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; if (info->relocateable) return true; 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; int r_type; r_type = ELF32_R_TYPE (rel->r_info); r_symndx = ELF32_R_SYM (rel->r_info); if (r_type == R_OPENRISC_GNU_VTINHERIT || r_type == R_OPENRISC_GNU_VTENTRY) continue; if ((unsigned int) r_type > (sizeof openrisc_elf_howto_table / sizeof (reloc_howto_type))) abort (); /* This is a final link. */ howto = openrisc_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 { 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); } else if (h->root.type == bfd_link_hash_undefweak) { relocation = 0; } else { if (!((*info->callbacks->undefined_symbol) (info, h->root.root.string, input_bfd, input_section, rel->r_offset, true))) return false; relocation = 0; } } r = openrisc_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, 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 * openrisc_elf_gc_mark_hook (sec, info, rel, h, sym) asection *sec; struct bfd_link_info *info ATTRIBUTE_UNUSED; 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_OPENRISC_GNU_VTINHERIT: case R_OPENRISC_GNU_VTENTRY: break; default: switch (h->root.type) { case bfd_link_hash_defined: case bfd_link_hash_defweak: return h->root.u.def.section; case bfd_link_hash_common: return h->root.u.c.p->section; default: break; } } } else return bfd_section_from_elf_index (sec->owner, sym->st_shndx); return NULL; } /* Update the got entry reference counts for the section being removed. */ static boolean openrisc_elf_gc_sweep_hook (abfd, info, sec, relocs) bfd *abfd ATTRIBUTE_UNUSED; struct bfd_link_info *info ATTRIBUTE_UNUSED; asection *sec ATTRIBUTE_UNUSED; const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; { return true; } /* 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 boolean openrisc_elf_check_relocs (abfd, info, sec, 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, **sym_hashes_end; const Elf_Internal_Rela *rel; const Elf_Internal_Rela *rel_end; if (info->relocateable) return true; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); if (!elf_bad_symtab (abfd)) sym_hashes_end -= symtab_hdr->sh_info; 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]; switch (ELF32_R_TYPE (rel->r_info)) { /* This relocation describes the C++ object vtable hierarchy. Reconstruct it for later use during GC. */ case R_OPENRISC_GNU_VTINHERIT: if (!_bfd_elf32_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_OPENRISC_GNU_VTENTRY: if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) return false; break; } } return true; } /* Set the right machine number. */ static boolean openrisc_elf_object_p (abfd) bfd *abfd; { switch (elf_elfheader (abfd)->e_flags & 0xf) { default: (void) bfd_default_set_arch_mach (abfd, bfd_arch_openrisc, 0); break; } return true; } /* Store the machine number in the flags field. */ static void openrisc_elf_final_write_processing (abfd, linker) bfd *abfd; boolean linker ATTRIBUTE_UNUSED; { unsigned long val; switch (bfd_get_mach (abfd)) { default: val = 0; break; } elf_elfheader (abfd)->e_flags &= ~0xf; elf_elfheader (abfd)->e_flags |= val; } #define ELF_ARCH bfd_arch_openrisc #define ELF_MACHINE_CODE EM_OPENRISC #define ELF_MACHINE_ALT1 EM_OPENRISC_OLD #define ELF_MAXPAGESIZE 0x1000 #define TARGET_BIG_SYM bfd_elf32_openrisc_vec #define TARGET_BIG_NAME "elf32-openrisc" #define elf_info_to_howto_rel NULL #define elf_info_to_howto openrisc_info_to_howto_rela #define elf_backend_relocate_section openrisc_elf_relocate_section #define elf_backend_gc_mark_hook openrisc_elf_gc_mark_hook #define elf_backend_gc_sweep_hook openrisc_elf_gc_sweep_hook #define elf_backend_check_relocs openrisc_elf_check_relocs #define elf_backend_can_gc_sections 1 #define elf_backend_rela_normal 1 #define bfd_elf32_bfd_reloc_type_lookup openrisc_reloc_type_lookup #define elf_backend_object_p openrisc_elf_object_p #define elf_backend_final_write_processing openrisc_elf_final_write_processing #include "elf32-target.h"