diff options
Diffstat (limited to 'binutils-2.25/bfd/elf32-mt.c')
| -rw-r--r-- | binutils-2.25/bfd/elf32-mt.c | 622 |
1 files changed, 622 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elf32-mt.c b/binutils-2.25/bfd/elf32-mt.c new file mode 100644 index 00000000..ea05c911 --- /dev/null +++ b/binutils-2.25/bfd/elf32-mt.c @@ -0,0 +1,622 @@ +/* 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; + + RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, + r_symndx, symtab_hdr, sym_hashes, + h, sec, relocation, + unresolved_reloc, warned); + + 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" |