| /* Morpho Technologies MT specific support for 32-bit ELF |
| Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2011, 2012 |
| 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., 59 Temple Place - Suite 330, Boston, |
| MA 02111-1307, USA. */ |
| |
| #include "sysdep.h" |
| #include "bfd.h" |
| #include "libbfd.h" |
| #include "elf-bfd.h" |
| #include "elf/mt.h" |
| |
| /* Prototypes. */ |
| static reloc_howto_type * mt_reloc_type_lookup |
| (bfd *, bfd_reloc_code_real_type); |
| |
| static void mt_info_to_howto_rela |
| (bfd *, arelent *, Elf_Internal_Rela *); |
| |
| static bfd_reloc_status_type mt_elf_relocate_hi16 |
| (bfd *, Elf_Internal_Rela *, bfd_byte *, bfd_vma); |
| |
| static bfd_reloc_status_type mt_final_link_relocate |
| (reloc_howto_type *, bfd *, asection *, bfd_byte *, |
| Elf_Internal_Rela *, bfd_vma); |
| |
| static bfd_boolean mt_elf_relocate_section |
| (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, |
| Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); |
| |
| /* Relocation tables. */ |
| static reloc_howto_type mt_elf_howto_table [] = |
| { |
| /* This reloc does nothing. */ |
| HOWTO (R_MT_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_MT_NONE", /* name */ |
| FALSE, /* partial_inplace */ |
| 0 , /* src_mask */ |
| 0, /* dst_mask */ |
| FALSE), /* pcrel_offset */ |
| |
| /* A 16 bit absolute relocation. */ |
| HOWTO (R_MT_16, /* type */ |
| 0, /* rightshift */ |
| 2, /* 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_MT_16", /* name */ |
| FALSE, /* partial_inplace */ |
| 0 , /* src_mask */ |
| 0xffff, /* dst_mask */ |
| FALSE), /* pcrel_offset */ |
| |
| /* A 32 bit absolute relocation. */ |
| HOWTO (R_MT_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_MT_32", /* name */ |
| FALSE, /* partial_inplace */ |
| 0 , /* src_mask */ |
| 0xffffffff, /* dst_mask */ |
| FALSE), /* pcrel_offset */ |
| |
| /* A 32 bit pc-relative relocation. */ |
| HOWTO (R_MT_32_PCREL, /* type */ |
| 0, /* rightshift */ |
| 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 32, /* bitsize */ |
| TRUE, /* pc_relative */ |
| 0, /* bitpos */ |
| complain_overflow_dont, /* complain_on_overflow */ |
| bfd_elf_generic_reloc, /* special_function */ |
| "R_MT_32_PCREL", /* name */ |
| FALSE, /* partial_inplace */ |
| 0 , /* src_mask */ |
| 0xffffffff, /* dst_mask */ |
| TRUE), /* pcrel_offset */ |
| |
| /* A 16 bit pc-relative relocation. */ |
| HOWTO (R_MT_PC16, /* type */ |
| 0, /* 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_MT_PC16", /* name */ |
| FALSE, /* partial_inplace */ |
| 0, /* src_mask */ |
| 0xffff, /* dst_mask */ |
| TRUE), /* pcrel_offset */ |
| |
| /* high 16 bits of symbol value. */ |
| HOWTO (R_MT_HI16, /* type */ |
| 0, /* rightshift */ |
| 2, /* 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_MT_HI16", /* name */ |
| FALSE, /* partial_inplace */ |
| 0xffff0000, /* src_mask */ |
| 0xffff0000, /* dst_mask */ |
| FALSE), /* pcrel_offset */ |
| |
| /* Low 16 bits of symbol value. */ |
| HOWTO (R_MT_LO16, /* type */ |
| 0, /* rightshift */ |
| 2, /* 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_MT_LO16", /* name */ |
| FALSE, /* partial_inplace */ |
| 0xffff, /* src_mask */ |
| 0xffff, /* dst_mask */ |
| FALSE), /* pcrel_offset */ |
| }; |
| |
| /* Map BFD reloc types to MT ELF reloc types. */ |
| |
| static reloc_howto_type * |
| mt_reloc_type_lookup |
| (bfd * abfd ATTRIBUTE_UNUSED, |
| bfd_reloc_code_real_type code) |
| { |
| /* Note that the mt_elf_howto_table is indxed by the R_ |
| constants. Thus, the order that the howto records appear in the |
| table *must* match the order of the relocation types defined in |
| include/elf/mt.h. */ |
| |
| switch (code) |
| { |
| case BFD_RELOC_NONE: |
| return &mt_elf_howto_table[ (int) R_MT_NONE]; |
| case BFD_RELOC_16: |
| return &mt_elf_howto_table[ (int) R_MT_16]; |
| case BFD_RELOC_32: |
| return &mt_elf_howto_table[ (int) R_MT_32]; |
| case BFD_RELOC_32_PCREL: |
| return &mt_elf_howto_table[ (int) R_MT_32_PCREL]; |
| case BFD_RELOC_16_PCREL: |
| return &mt_elf_howto_table[ (int) R_MT_PC16]; |
| case BFD_RELOC_HI16: |
| return &mt_elf_howto_table[ (int) R_MT_HI16]; |
| case BFD_RELOC_LO16: |
| return &mt_elf_howto_table[ (int) R_MT_LO16]; |
| |
| default: |
| /* Pacify gcc -Wall. */ |
| return NULL; |
| } |
| return NULL; |
| } |
| |
| static reloc_howto_type * |
| mt_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| const char *r_name) |
| { |
| unsigned int i; |
| |
| for (i = 0; |
| i < sizeof (mt_elf_howto_table) / sizeof (mt_elf_howto_table[0]); |
| i++) |
| if (mt_elf_howto_table[i].name != NULL |
| && strcasecmp (mt_elf_howto_table[i].name, r_name) == 0) |
| return &mt_elf_howto_table[i]; |
| |
| return NULL; |
| } |
| |
| bfd_reloc_status_type |
| mt_elf_relocate_hi16 |
| (bfd * input_bfd, |
| Elf_Internal_Rela * relhi, |
| bfd_byte * contents, |
| bfd_vma value) |
| { |
| bfd_vma insn; |
| |
| insn = bfd_get_32 (input_bfd, contents + relhi->r_offset); |
| |
| value += relhi->r_addend; |
| value >>= 16; |
| insn = ((insn & ~0xFFFF) | value); |
| |
| bfd_put_32 (input_bfd, insn, contents + relhi->r_offset); |
| return bfd_reloc_ok; |
| } |
| |
| /* XXX: The following code is the result of a cut&paste. This unfortunate |
| practice is very widespread in the various target back-end files. */ |
| |
| /* Set the howto pointer for a MT ELF reloc. */ |
| |
| static void |
| mt_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); |
| cache_ptr->howto = & mt_elf_howto_table [r_type]; |
| } |
| |
| /* Perform a single relocation. By default we use the standard BFD |
| routines. */ |
| |
| static bfd_reloc_status_type |
| mt_final_link_relocate |
| (reloc_howto_type * howto, |
| bfd * input_bfd, |
| asection * input_section, |
| bfd_byte * contents, |
| Elf_Internal_Rela * rel, |
| bfd_vma relocation) |
| { |
| return _bfd_final_link_relocate (howto, input_bfd, input_section, |
| contents, rel->r_offset, |
| relocation, rel->r_addend); |
| } |
| |
| /* Relocate a MT 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 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 |
| mt_elf_relocate_section |
| (bfd * output_bfd ATTRIBUTE_UNUSED, |
| 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); |
| |
| howto = mt_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; |
| bfd_boolean warned, ignored; |
| |
| RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| r_symndx, symtab_hdr, sym_hashes, |
| h, sec, relocation, |
| unresolved_reloc, warned, ignored); |
| |
| 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; |
| |
| /* Finally, the sole MT-specific part. */ |
| switch (r_type) |
| { |
| case R_MT_HI16: |
| r = mt_elf_relocate_hi16 (input_bfd, rel, contents, relocation); |
| break; |
| default: |
| r = mt_final_link_relocate (howto, input_bfd, input_section, |
| contents, rel, relocation); |
| break; |
| } |
| |
| |
| if (r != bfd_reloc_ok) |
| { |
| const char * msg = (const char *) 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_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; |
| } |
| |
| /* 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 |
| mt_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; |
| } |
| |
| /* Return the MACH for an e_flags value. */ |
| |
| static int |
| elf32_mt_machine (bfd *abfd) |
| { |
| switch (elf_elfheader (abfd)->e_flags & EF_MT_CPU_MASK) |
| { |
| case EF_MT_CPU_MRISC: return bfd_mach_ms1; |
| case EF_MT_CPU_MRISC2: return bfd_mach_mrisc2; |
| case EF_MT_CPU_MS2: return bfd_mach_ms2; |
| } |
| |
| return bfd_mach_ms1; |
| } |
| |
| static bfd_boolean |
| mt_elf_object_p (bfd * abfd) |
| { |
| bfd_default_set_arch_mach (abfd, bfd_arch_mt, elf32_mt_machine (abfd)); |
| |
| return TRUE; |
| } |
| |
| /* Function to set the ELF flag bits. */ |
| |
| static bfd_boolean |
| mt_elf_set_private_flags (bfd * abfd, |
| flagword flags) |
| { |
| elf_elfheader (abfd)->e_flags = flags; |
| elf_flags_init (abfd) = TRUE; |
| return TRUE; |
| } |
| |
| static bfd_boolean |
| mt_elf_copy_private_bfd_data (bfd * ibfd, bfd * obfd) |
| { |
| if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour |
| || bfd_get_flavour (obfd) != bfd_target_elf_flavour) |
| return TRUE; |
| |
| BFD_ASSERT (!elf_flags_init (obfd) |
| || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags); |
| |
| elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; |
| elf_flags_init (obfd) = TRUE; |
| |
| /* Copy object attributes. */ |
| _bfd_elf_copy_obj_attributes (ibfd, obfd); |
| |
| return TRUE; |
| } |
| |
| /* Merge backend specific data from an object file to the output |
| object file when linking. */ |
| |
| static bfd_boolean |
| mt_elf_merge_private_bfd_data (bfd * ibfd, bfd * obfd) |
| { |
| flagword old_flags, new_flags; |
| bfd_boolean ok = TRUE; |
| |
| /* Check if we have the same endianness. */ |
| if (_bfd_generic_verify_endian_match (ibfd, obfd) == FALSE) |
| return FALSE; |
| |
| /* If they're not both mt, then merging is meaningless, so just |
| don't do it. */ |
| if (strcmp (ibfd->arch_info->arch_name, "mt") != 0) |
| return TRUE; |
| if (strcmp (obfd->arch_info->arch_name, "mt") != 0) |
| return TRUE; |
| |
| new_flags = elf_elfheader (ibfd)->e_flags; |
| old_flags = elf_elfheader (obfd)->e_flags; |
| |
| #ifdef DEBUG |
| _bfd_error_handler ("%B: old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s", |
| ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no"); |
| #endif |
| |
| if (!elf_flags_init (obfd)) |
| { |
| old_flags = new_flags; |
| elf_flags_init (obfd) = TRUE; |
| } |
| else if ((new_flags & EF_MT_CPU_MASK) != (old_flags & EF_MT_CPU_MASK)) |
| { |
| /* CPU has changed. This is invalid, because MRISC, MRISC2 and |
| MS2 are not subsets of each other. */ |
| ok = FALSE; |
| } |
| |
| if (ok) |
| { |
| obfd->arch_info = ibfd->arch_info; |
| elf_elfheader (obfd)->e_flags = old_flags; |
| } |
| |
| return ok; |
| } |
| |
| static bfd_boolean |
| mt_elf_print_private_bfd_data (bfd * abfd, void * ptr) |
| { |
| FILE * file = (FILE *) ptr; |
| flagword flags; |
| |
| BFD_ASSERT (abfd != NULL && ptr != NULL); |
| |
| /* Print normal ELF private data. */ |
| _bfd_elf_print_private_bfd_data (abfd, ptr); |
| |
| flags = elf_elfheader (abfd)->e_flags; |
| fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags); |
| |
| switch (flags & EF_MT_CPU_MASK) |
| { |
| default: |
| case EF_MT_CPU_MRISC: fprintf (file, " ms1-16-002"); break; |
| case EF_MT_CPU_MRISC2: fprintf (file, " ms1-16-003"); break; |
| case EF_MT_CPU_MS2: fprintf (file, " ms2"); break; |
| } |
| |
| fputc ('\n', file); |
| |
| return TRUE; |
| } |
| |
| |
| #define TARGET_BIG_SYM bfd_elf32_mt_vec |
| #define TARGET_BIG_NAME "elf32-mt" |
| |
| #define ELF_ARCH bfd_arch_mt |
| #define ELF_MACHINE_CODE EM_MT |
| #define ELF_MAXPAGESIZE 1 /* No pages on the MT. */ |
| |
| #define elf_info_to_howto_rel NULL |
| #define elf_info_to_howto mt_info_to_howto_rela |
| |
| #define elf_backend_relocate_section mt_elf_relocate_section |
| |
| #define bfd_elf32_bfd_reloc_type_lookup mt_reloc_type_lookup |
| #define bfd_elf32_bfd_reloc_name_lookup mt_reloc_name_lookup |
| |
| #define elf_backend_check_relocs mt_elf_check_relocs |
| #define elf_backend_object_p mt_elf_object_p |
| #define elf_backend_rela_normal 1 |
| |
| #define elf_backend_can_gc_sections 1 |
| |
| #define bfd_elf32_bfd_set_private_flags mt_elf_set_private_flags |
| #define bfd_elf32_bfd_copy_private_bfd_data mt_elf_copy_private_bfd_data |
| #define bfd_elf32_bfd_merge_private_bfd_data mt_elf_merge_private_bfd_data |
| #define bfd_elf32_bfd_print_private_bfd_data mt_elf_print_private_bfd_data |
| |
| #include "elf32-target.h" |
