/* Morpho Technologies MT specific support for 32-bit ELF Copyright (C) 2001-2016 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 */ 3, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* 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); if (r_type >= (unsigned int) R_MT_max) { _bfd_error_handler (_("%B: invalid MT reloc number: %d"), abfd, r_type); r_type = 0; } 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 (bfd_link_relocatable (info)) 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: (*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: (*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) (*info->callbacks->warning) (info, msg, name, input_bfd, input_section, rel->r_offset); } } 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 (bfd_link_relocatable (info)) 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; } /* 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)) 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 mt_elf32_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_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"