| /* OpenRISC-specific support for 32-bit ELF. |
| Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| 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 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/openrisc.h" |
| #include "libiberty.h" |
| |
| 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 (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; |
| } |
| |
| static reloc_howto_type * |
| openrisc_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| const char *r_name) |
| { |
| unsigned int i; |
| |
| for (i = 0; |
| i < (sizeof (openrisc_elf_howto_table) |
| / sizeof (openrisc_elf_howto_table[0])); |
| i++) |
| if (openrisc_elf_howto_table[i].name != NULL |
| && strcasecmp (openrisc_elf_howto_table[i].name, r_name) == 0) |
| return &openrisc_elf_howto_table[i]; |
| |
| return NULL; |
| } |
| |
| /* Set the howto pointer for an OpenRISC ELF reloc. */ |
| |
| static void |
| openrisc_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_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 (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 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 |
| openrisc_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 = 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 (); |
| |
| 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 |
| { |
| 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); |
| } |
| |
| if (sec != NULL && elf_discarded_section (sec)) |
| { |
| /* For relocs against symbols from removed linkonce sections, |
| or sections discarded by a linker script, we just want the |
| section contents zeroed. Avoid any special processing. */ |
| _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); |
| rel->r_info = 0; |
| rel->r_addend = 0; |
| continue; |
| } |
| |
| if (info->relocatable) |
| continue; |
| |
| r = openrisc_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 * |
| openrisc_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_OPENRISC_GNU_VTINHERIT: |
| case R_OPENRISC_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 |
| openrisc_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; |
| } |
| |
| 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_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_OPENRISC_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; |
| } |
| |
| /* Set the right machine number. */ |
| |
| static bfd_boolean |
| openrisc_elf_object_p (bfd *abfd) |
| { |
| bfd_default_set_arch_mach (abfd, bfd_arch_openrisc, 0); |
| return TRUE; |
| } |
| |
| /* Store the machine number in the flags field. */ |
| |
| static void |
| openrisc_elf_final_write_processing (bfd *abfd, |
| bfd_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_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 bfd_elf32_bfd_reloc_name_lookup openrisc_reloc_name_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" |