| /* D10V-specific support for 32-bit ELF |
| Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, |
| 2007 Free Software Foundation, Inc. |
| Contributed by Martin Hunt (hunt@cygnus.com). |
| |
| 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/d10v.h" |
| |
| /* Use REL instead of RELA to save space. */ |
| #define USE_REL 1 |
| |
| static reloc_howto_type elf_d10v_howto_table[] = |
| { |
| /* This reloc does nothing. */ |
| HOWTO (R_D10V_NONE, /* Type. */ |
| 0, /* Rightshift. */ |
| 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 32, /* Bitsize. */ |
| FALSE, /* PC_relative. */ |
| 0, /* Bitpos. */ |
| complain_overflow_dont,/* Complain_on_overflow. */ |
| bfd_elf_generic_reloc, /* Special_function. */ |
| "R_D10V_NONE", /* Name. */ |
| FALSE, /* Partial_inplace. */ |
| 0, /* Src_mask. */ |
| 0, /* Dst_mask. */ |
| FALSE), /* PCrel_offset. */ |
| |
| /* An PC Relative 10-bit relocation, shifted by 2, right container. */ |
| HOWTO (R_D10V_10_PCREL_R, /* Type. */ |
| 2, /* Rightshift. */ |
| 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 8, /* Bitsize. */ |
| TRUE, /* PC_relative. */ |
| 0, /* Bitpos. */ |
| complain_overflow_signed, /* Complain_on_overflow. */ |
| bfd_elf_generic_reloc, /* Special_function. */ |
| "R_D10V_10_PCREL_R", /* Name. */ |
| FALSE, /* Partial_inplace. */ |
| 0xff, /* Src_mask. */ |
| 0xff, /* Dst_mask. */ |
| TRUE), /* PCrel_offset. */ |
| |
| /* An PC Relative 10-bit relocation, shifted by 2, left container. */ |
| HOWTO (R_D10V_10_PCREL_L, /* Type. */ |
| 2, /* Rightshift. */ |
| 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 8, /* Bitsize. */ |
| TRUE, /* PC_relative. */ |
| 15, /* Bitpos. */ |
| complain_overflow_signed, /* Complain_on_overflow. */ |
| bfd_elf_generic_reloc, /* Special_function. */ |
| "R_D10V_10_PCREL_L", /* Name. */ |
| FALSE, /* Partial_inplace. */ |
| 0x07f8000, /* Src_mask. */ |
| 0x07f8000, /* Dst_mask. */ |
| TRUE), /* PCrel_offset. */ |
| |
| /* A 16 bit absolute relocation. */ |
| HOWTO (R_D10V_16, /* 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_D10V_16", /* Name. */ |
| FALSE, /* Partial_inplace. */ |
| 0xffff, /* Src_mask. */ |
| 0xffff, /* Dst_mask. */ |
| FALSE), /* PCrel_offset. */ |
| |
| /* An 18 bit absolute relocation, right shifted 2. */ |
| HOWTO (R_D10V_18, /* Type. */ |
| 2, /* 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_D10V_18", /* Name. */ |
| FALSE, /* Partial_inplace. */ |
| 0xffff, /* Src_mask. */ |
| 0xffff, /* Dst_mask. */ |
| FALSE), /* PCrel_offset. */ |
| |
| /* A relative 18 bit relocation, right shifted by 2. */ |
| HOWTO (R_D10V_18_PCREL, /* Type. */ |
| 2, /* Rightshift. */ |
| 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 16, /* Bitsize. */ |
| TRUE, /* PC_relative. */ |
| 0, /* Bitpos. */ |
| complain_overflow_signed, /* Complain_on_overflow. */ |
| bfd_elf_generic_reloc, /* Special_function. */ |
| "R_D10V_18_PCREL", /* Name. */ |
| FALSE, /* Partial_inplace. */ |
| 0xffff, /* Src_mask. */ |
| 0xffff, /* Dst_mask. */ |
| TRUE), /* PCrel_offset. */ |
| |
| /* A 32 bit absolute relocation. */ |
| HOWTO (R_D10V_32, /* Type. */ |
| 0, /* Rightshift. */ |
| 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 32, /* Bitsize. */ |
| FALSE, /* PC_relative. */ |
| 0, /* Bitpos. */ |
| complain_overflow_dont,/* Complain_on_overflow. */ |
| bfd_elf_generic_reloc, /* Special_function. */ |
| "R_D10V_32", /* Name. */ |
| FALSE, /* Partial_inplace. */ |
| 0xffffffff, /* Src_mask. */ |
| 0xffffffff, /* Dst_mask. */ |
| FALSE), /* PCrel_offset. */ |
| |
| /* GNU extension to record C++ vtable hierarchy. */ |
| HOWTO (R_D10V_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_D10V_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_D10V_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_D10V_GNU_VTENTRY", /* Name. */ |
| FALSE, /* Partial_inplace. */ |
| 0, /* Src_mask. */ |
| 0, /* Dst_mask. */ |
| FALSE), /* PCrel_offset. */ |
| }; |
| |
| /* Map BFD reloc types to D10V ELF reloc types. */ |
| |
| struct d10v_reloc_map |
| { |
| bfd_reloc_code_real_type bfd_reloc_val; |
| unsigned char elf_reloc_val; |
| }; |
| |
| static const struct d10v_reloc_map d10v_reloc_map[] = |
| { |
| { BFD_RELOC_NONE, R_D10V_NONE, }, |
| { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R }, |
| { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L }, |
| { BFD_RELOC_16, R_D10V_16 }, |
| { BFD_RELOC_D10V_18, R_D10V_18 }, |
| { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL }, |
| { BFD_RELOC_32, R_D10V_32 }, |
| { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT }, |
| { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY }, |
| }; |
| |
| static reloc_howto_type * |
| bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| bfd_reloc_code_real_type code) |
| { |
| unsigned int i; |
| |
| for (i = 0; |
| i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map); |
| i++) |
| if (d10v_reloc_map[i].bfd_reloc_val == code) |
| return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val]; |
| |
| return NULL; |
| } |
| |
| static reloc_howto_type * |
| bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| const char *r_name) |
| { |
| unsigned int i; |
| |
| for (i = 0; |
| i < sizeof (elf_d10v_howto_table) / sizeof (elf_d10v_howto_table[0]); |
| i++) |
| if (elf_d10v_howto_table[i].name != NULL |
| && strcasecmp (elf_d10v_howto_table[i].name, r_name) == 0) |
| return &elf_d10v_howto_table[i]; |
| |
| return NULL; |
| } |
| |
| /* Set the howto pointer for an D10V ELF reloc. */ |
| |
| static void |
| d10v_info_to_howto_rel (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_D10V_max); |
| cache_ptr->howto = &elf_d10v_howto_table[r_type]; |
| } |
| |
| static asection * |
| elf32_d10v_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_D10V_GNU_VTINHERIT: |
| case R_D10V_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 |
| elf32_d10v_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_D10V_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_D10V_GNU_VTENTRY: |
| BFD_ASSERT (h != NULL); |
| if (h != NULL |
| && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) |
| return FALSE; |
| break; |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| static bfd_vma |
| extract_rel_addend (bfd *abfd, |
| bfd_byte *where, |
| reloc_howto_type *howto) |
| { |
| bfd_vma insn, val; |
| |
| switch (howto->size) |
| { |
| case 0: |
| insn = bfd_get_8 (abfd, where); |
| break; |
| case 1: |
| insn = bfd_get_16 (abfd, where); |
| break; |
| case 2: |
| insn = bfd_get_32 (abfd, where); |
| break; |
| default: |
| abort (); |
| } |
| |
| val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift; |
| /* We should really be testing for signed addends here, but we don't |
| have that info directly in the howto. */ |
| if (howto->pc_relative) |
| { |
| bfd_vma sign; |
| sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1)); |
| sign = sign >> howto->bitpos << howto->rightshift; |
| val = (val ^ sign) - sign; |
| } |
| return val; |
| } |
| |
| static void |
| insert_rel_addend (bfd *abfd, |
| bfd_byte *where, |
| reloc_howto_type *howto, |
| bfd_vma addend) |
| { |
| bfd_vma insn; |
| |
| addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask; |
| insn = ~howto->dst_mask; |
| switch (howto->size) |
| { |
| case 0: |
| insn &= bfd_get_8 (abfd, where); |
| insn |= addend; |
| bfd_put_8 (abfd, insn, where); |
| break; |
| case 1: |
| insn &= bfd_get_16 (abfd, where); |
| insn |= addend; |
| bfd_put_16 (abfd, insn, where); |
| break; |
| case 2: |
| insn &= bfd_get_32 (abfd, where); |
| insn |= addend; |
| bfd_put_32 (abfd, insn, where); |
| break; |
| default: |
| abort (); |
| } |
| } |
| |
| /* Relocate a D10V ELF section. */ |
| |
| static bfd_boolean |
| elf32_d10v_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, *relend; |
| const char *name; |
| |
| symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; |
| sym_hashes = elf_sym_hashes (input_bfd); |
| |
| rel = relocs; |
| relend = relocs + input_section->reloc_count; |
| for (; rel < relend; rel++) |
| { |
| int r_type; |
| 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; |
| |
| r_symndx = ELF32_R_SYM (rel->r_info); |
| r_type = ELF32_R_TYPE (rel->r_info); |
| |
| if (r_type == R_D10V_GNU_VTENTRY |
| || r_type == R_D10V_GNU_VTINHERIT) |
| continue; |
| |
| howto = elf_d10v_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 = (sec->output_section->vma |
| + sec->output_offset |
| + sym->st_value); |
| if (ELF_ST_TYPE (sym->st_info) == STT_SECTION |
| && ((sec->flags & SEC_MERGE) != 0 |
| || (info->relocatable |
| && sec->output_offset != 0))) |
| { |
| bfd_vma addend; |
| bfd_byte *where = contents + rel->r_offset; |
| |
| addend = extract_rel_addend (input_bfd, where, howto); |
| |
| if (info->relocatable) |
| addend += sec->output_offset; |
| else |
| { |
| asection *msec = sec; |
| addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, |
| addend); |
| addend -= relocation; |
| addend += msec->output_section->vma + msec->output_offset; |
| } |
| insert_rel_addend (input_bfd, where, howto, addend); |
| } |
| } |
| 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; |
| |
| if (h != NULL) |
| name = h->root.root.string; |
| else |
| { |
| name = (bfd_elf_string_from_elf_section |
| (input_bfd, symtab_hdr->sh_link, sym->st_name)); |
| if (name == NULL || *name == '\0') |
| name = bfd_section_name (input_bfd, sec); |
| } |
| |
| r = _bfd_final_link_relocate (howto, input_bfd, input_section, |
| contents, rel->r_offset, |
| relocation, (bfd_vma) 0); |
| |
| if (r != bfd_reloc_ok) |
| { |
| const char * msg = (const char *) 0; |
| |
| switch (r) |
| { |
| case bfd_reloc_overflow: |
| if (!((*info->callbacks->reloc_overflow) |
| (info, (h ? &h->root : NULL), name, howto->name, |
| (bfd_vma) 0, input_bfd, input_section, |
| rel->r_offset))) |
| return FALSE; |
| break; |
| |
| case bfd_reloc_undefined: |
| if (!((*info->callbacks->undefined_symbol) |
| (info, name, input_bfd, input_section, |
| rel->r_offset, TRUE))) |
| return FALSE; |
| break; |
| |
| case bfd_reloc_outofrange: |
| msg = _("internal error: out of range error"); |
| goto common_error; |
| |
| case bfd_reloc_notsupported: |
| msg = _("internal error: unsupported relocation error"); |
| goto common_error; |
| |
| case bfd_reloc_dangerous: |
| msg = _("internal error: dangerous error"); |
| goto common_error; |
| |
| default: |
| msg = _("internal error: unknown error"); |
| /* fall through */ |
| |
| common_error: |
| if (!((*info->callbacks->warning) |
| (info, msg, name, input_bfd, input_section, |
| rel->r_offset))) |
| return FALSE; |
| break; |
| } |
| } |
| } |
| |
| return TRUE; |
| } |
| #define ELF_ARCH bfd_arch_d10v |
| #define ELF_MACHINE_CODE EM_D10V |
| #define ELF_MACHINE_ALT1 EM_CYGNUS_D10V |
| #define ELF_MAXPAGESIZE 0x1000 |
| |
| #define TARGET_BIG_SYM bfd_elf32_d10v_vec |
| #define TARGET_BIG_NAME "elf32-d10v" |
| |
| #define elf_info_to_howto 0 |
| #define elf_info_to_howto_rel d10v_info_to_howto_rel |
| #define elf_backend_object_p 0 |
| #define elf_backend_final_write_processing 0 |
| #define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook |
| #define elf_backend_check_relocs elf32_d10v_check_relocs |
| #define elf_backend_relocate_section elf32_d10v_relocate_section |
| #define elf_backend_can_gc_sections 1 |
| |
| #include "elf32-target.h" |
