1667 lines
44 KiB
C
1667 lines
44 KiB
C
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/* M16C/M32C specific support for 32-bit ELF.
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Copyright (C) 2005
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Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/m32c.h"
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#include "libiberty.h"
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/* Forward declarations. */
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static reloc_howto_type * m32c_reloc_type_lookup
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(bfd *, bfd_reloc_code_real_type);
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static void m32c_info_to_howto_rela
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(bfd *, arelent *, Elf_Internal_Rela *);
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static bfd_boolean m32c_elf_relocate_section
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(bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
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static bfd_boolean m32c_elf_gc_sweep_hook
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(bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
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static asection * m32c_elf_gc_mark_hook
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(asection *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *);
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static bfd_boolean m32c_elf_check_relocs
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(bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
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static bfd_boolean m32c_elf_relax_delete_bytes (bfd *, asection *, bfd_vma, int);
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#ifdef DEBUG
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static char * m32c_get_reloc (long reloc);
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#endif
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static bfd_boolean m32c_elf_relax_section
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(bfd *abfd, asection *sec, struct bfd_link_info *link_info, bfd_boolean *again);
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static reloc_howto_type m32c_elf_howto_table [] =
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{
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/* This reloc does nothing. */
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HOWTO (R_M32C_NONE, /* type */
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0, /* rightshift */
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0, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M32C_NONE", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_M32C_16, /* type */
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0, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M32C_16", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0x0000ffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_M32C_24, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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24, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M32C_24", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0x00ffffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_M32C_32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M32C_32", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0xffffffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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HOWTO (R_M32C_8_PCREL, /* type */
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0, /* rightshift */
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0, /* size (0 = byte, 1 = short, 2 = long) */
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8, /* bitsize */
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TRUE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M32C_8_PCREL", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0x000000ff, /* dst_mask */
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TRUE), /* pcrel_offset */
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HOWTO (R_M32C_16_PCREL, /* type */
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0, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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TRUE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_M32C_16_PCREL", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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TRUE), /* pcrel_offset */
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};
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/* Map BFD reloc types to M32C ELF reloc types. */
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struct m32c_reloc_map
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{
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bfd_reloc_code_real_type bfd_reloc_val;
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unsigned int m32c_reloc_val;
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};
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static const struct m32c_reloc_map m32c_reloc_map [] =
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{
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{ BFD_RELOC_NONE, R_M32C_NONE },
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{ BFD_RELOC_16, R_M32C_16 },
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{ BFD_RELOC_24, R_M32C_24 },
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{ BFD_RELOC_32, R_M32C_32 },
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{ BFD_RELOC_8_PCREL, R_M32C_8_PCREL },
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{ BFD_RELOC_16_PCREL, R_M32C_16_PCREL }
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};
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static reloc_howto_type *
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m32c_reloc_type_lookup
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(bfd * abfd ATTRIBUTE_UNUSED,
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bfd_reloc_code_real_type code)
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{
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unsigned int i;
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for (i = ARRAY_SIZE (m32c_reloc_map); --i;)
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if (m32c_reloc_map [i].bfd_reloc_val == code)
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return & m32c_elf_howto_table [m32c_reloc_map[i].m32c_reloc_val];
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return NULL;
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}
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/* Set the howto pointer for an M32C ELF reloc. */
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static void
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m32c_info_to_howto_rela
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(bfd * abfd ATTRIBUTE_UNUSED,
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arelent * cache_ptr,
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Elf_Internal_Rela * dst)
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{
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unsigned int r_type;
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r_type = ELF32_R_TYPE (dst->r_info);
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BFD_ASSERT (r_type < (unsigned int) R_M32C_max);
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cache_ptr->howto = & m32c_elf_howto_table [r_type];
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}
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/* Relocate an M32C ELF section.
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There is some attempt to make this function usable for many architectures,
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both USE_REL and USE_RELA ['twould be nice if such a critter existed],
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if only to serve as a learning tool.
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The RELOCATE_SECTION function is called by the new ELF backend linker
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to handle the relocations for a section.
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The relocs are always passed as Rela structures; if the section
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actually uses Rel structures, the r_addend field will always be
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zero.
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This function is responsible for adjusting the section contents as
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necessary, and (if using Rela relocs and generating a relocatable
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output file) adjusting the reloc addend as necessary.
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This function does not have to worry about setting the reloc
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address or the reloc symbol index.
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LOCAL_SYMS is a pointer to the swapped in local symbols.
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LOCAL_SECTIONS is an array giving the section in the input file
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corresponding to the st_shndx field of each local symbol.
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The global hash table entry for the global symbols can be found
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via elf_sym_hashes (input_bfd).
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When generating relocatable output, this function must handle
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STB_LOCAL/STT_SECTION symbols specially. The output symbol is
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going to be the section symbol corresponding to the output
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section, which means that the addend must be adjusted
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accordingly. */
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static bfd_boolean
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m32c_elf_relocate_section
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(bfd * output_bfd ATTRIBUTE_UNUSED,
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struct bfd_link_info * info,
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bfd * input_bfd,
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asection * input_section,
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bfd_byte * contents,
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Elf_Internal_Rela * relocs,
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Elf_Internal_Sym * local_syms,
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asection ** local_sections)
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{
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Elf_Internal_Shdr * symtab_hdr;
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struct elf_link_hash_entry ** sym_hashes;
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Elf_Internal_Rela * rel;
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Elf_Internal_Rela * relend;
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bfd *dynobj;
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asection *splt;
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symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
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sym_hashes = elf_sym_hashes (input_bfd);
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relend = relocs + input_section->reloc_count;
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dynobj = elf_hash_table (info)->dynobj;
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splt = NULL;
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if (dynobj != NULL)
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splt = bfd_get_section_by_name (dynobj, ".plt");
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for (rel = relocs; rel < relend; rel ++)
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{
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reloc_howto_type * howto;
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unsigned long r_symndx;
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Elf_Internal_Sym * sym;
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asection * sec;
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struct elf_link_hash_entry * h;
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bfd_vma relocation;
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bfd_reloc_status_type r;
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const char * name = NULL;
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int r_type;
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r_type = ELF32_R_TYPE (rel->r_info);
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r_symndx = ELF32_R_SYM (rel->r_info);
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if (info->relocatable)
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{
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/* This is a relocatable link. We don't have to change
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anything, unless the reloc is against a section symbol,
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in which case we have to adjust according to where the
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section symbol winds up in the output section. */
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if (r_symndx < symtab_hdr->sh_info)
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{
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sym = local_syms + r_symndx;
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if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
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{
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sec = local_sections [r_symndx];
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rel->r_addend += sec->output_offset + sym->st_value;
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}
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}
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continue;
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}
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/* This is a final link. */
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howto = m32c_elf_howto_table + ELF32_R_TYPE (rel->r_info);
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h = NULL;
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sym = NULL;
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sec = NULL;
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if (r_symndx < symtab_hdr->sh_info)
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{
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sym = local_syms + r_symndx;
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sec = local_sections [r_symndx];
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relocation = (sec->output_section->vma
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+ sec->output_offset
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+ sym->st_value);
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name = bfd_elf_string_from_elf_section
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(input_bfd, symtab_hdr->sh_link, sym->st_name);
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name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
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}
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else
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{
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h = sym_hashes [r_symndx - symtab_hdr->sh_info];
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while (h->root.type == bfd_link_hash_indirect
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|| h->root.type == bfd_link_hash_warning)
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h = (struct elf_link_hash_entry *) h->root.u.i.link;
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name = h->root.root.string;
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if (h->root.type == bfd_link_hash_defined
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|| h->root.type == bfd_link_hash_defweak)
|
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{
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sec = h->root.u.def.section;
|
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relocation = (h->root.u.def.value
|
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|
+ sec->output_section->vma
|
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|
+ sec->output_offset);
|
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|
}
|
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|
else if (h->root.type == bfd_link_hash_undefweak)
|
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|
{
|
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|
relocation = 0;
|
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|
}
|
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else
|
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{
|
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if (! ((*info->callbacks->undefined_symbol)
|
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(info, h->root.root.string, input_bfd,
|
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|
input_section, rel->r_offset, TRUE)))
|
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return FALSE;
|
|||
|
relocation = 0;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
switch (ELF32_R_TYPE (rel->r_info))
|
|||
|
{
|
|||
|
case R_M32C_16:
|
|||
|
{
|
|||
|
bfd_vma *plt_offset;
|
|||
|
|
|||
|
if (h != NULL)
|
|||
|
plt_offset = &h->plt.offset;
|
|||
|
else
|
|||
|
plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
|
|||
|
|
|||
|
/* printf("%s: rel %x plt %d\n", h ? h->root.root.string : "(none)",
|
|||
|
relocation, *plt_offset);*/
|
|||
|
if (relocation <= 0xffff)
|
|||
|
{
|
|||
|
/* If the symbol is in range for a 16-bit address, we should
|
|||
|
have deallocated the plt entry in relax_section. */
|
|||
|
BFD_ASSERT (*plt_offset == (bfd_vma) -1);
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
/* If the symbol is out of range for a 16-bit address,
|
|||
|
we must have allocated a plt entry. */
|
|||
|
BFD_ASSERT (*plt_offset != (bfd_vma) -1);
|
|||
|
|
|||
|
/* If this is the first time we've processed this symbol,
|
|||
|
fill in the plt entry with the correct symbol address. */
|
|||
|
if ((*plt_offset & 1) == 0)
|
|||
|
{
|
|||
|
unsigned int x;
|
|||
|
|
|||
|
x = 0x000000fc; /* jmpf */
|
|||
|
x |= (relocation << 8) & 0xffffff00;
|
|||
|
bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
|
|||
|
*plt_offset |= 1;
|
|||
|
}
|
|||
|
|
|||
|
relocation = (splt->output_section->vma
|
|||
|
+ splt->output_offset
|
|||
|
+ (*plt_offset & -2));
|
|||
|
}
|
|||
|
}
|
|||
|
break;
|
|||
|
}
|
|||
|
|
|||
|
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
|
|||
|
contents, rel->r_offset, relocation,
|
|||
|
rel->r_addend);
|
|||
|
|
|||
|
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_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 *
|
|||
|
m32c_elf_gc_mark_hook
|
|||
|
(asection * sec,
|
|||
|
struct bfd_link_info * info ATTRIBUTE_UNUSED,
|
|||
|
Elf_Internal_Rela * rel,
|
|||
|
struct elf_link_hash_entry * h,
|
|||
|
Elf_Internal_Sym * sym)
|
|||
|
{
|
|||
|
if (h != NULL)
|
|||
|
{
|
|||
|
switch (ELF32_R_TYPE (rel->r_info))
|
|||
|
{
|
|||
|
default:
|
|||
|
switch (h->root.type)
|
|||
|
{
|
|||
|
case bfd_link_hash_defined:
|
|||
|
case bfd_link_hash_defweak:
|
|||
|
return h->root.u.def.section;
|
|||
|
|
|||
|
case bfd_link_hash_common:
|
|||
|
return h->root.u.c.p->section;
|
|||
|
|
|||
|
default:
|
|||
|
break;
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
if (!(elf_bad_symtab (sec->owner)
|
|||
|
&& ELF_ST_BIND (sym->st_info) != STB_LOCAL)
|
|||
|
&& ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
|
|||
|
&& sym->st_shndx != SHN_COMMON))
|
|||
|
{
|
|||
|
return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return NULL;
|
|||
|
}
|
|||
|
|
|||
|
/* Update the got entry reference counts for the section being removed. */
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_elf_gc_sweep_hook
|
|||
|
(bfd * abfd ATTRIBUTE_UNUSED,
|
|||
|
struct bfd_link_info * info ATTRIBUTE_UNUSED,
|
|||
|
asection * sec ATTRIBUTE_UNUSED,
|
|||
|
const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
|
|||
|
{
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
/* We support 16-bit pointers to code above 64k by generating a thunk
|
|||
|
below 64k containing a JMP instruction to the final address. */
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_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;
|
|||
|
struct elf_link_hash_entry ** sym_hashes_end;
|
|||
|
const Elf_Internal_Rela * rel;
|
|||
|
const Elf_Internal_Rela * rel_end;
|
|||
|
bfd_vma *local_plt_offsets;
|
|||
|
asection *splt;
|
|||
|
bfd *dynobj;
|
|||
|
|
|||
|
if (info->relocatable)
|
|||
|
return TRUE;
|
|||
|
|
|||
|
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
|||
|
sym_hashes = elf_sym_hashes (abfd);
|
|||
|
local_plt_offsets = elf_local_got_offsets (abfd);
|
|||
|
splt = NULL;
|
|||
|
dynobj = elf_hash_table(info)->dynobj;
|
|||
|
|
|||
|
sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
|
|||
|
if (!elf_bad_symtab (abfd))
|
|||
|
sym_hashes_end -= symtab_hdr->sh_info;
|
|||
|
|
|||
|
rel_end = relocs + sec->reloc_count;
|
|||
|
for (rel = relocs; rel < rel_end; rel++)
|
|||
|
{
|
|||
|
struct elf_link_hash_entry *h;
|
|||
|
unsigned long r_symndx;
|
|||
|
bfd_vma *offset;
|
|||
|
|
|||
|
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 a 16-bit pointer to a function.
|
|||
|
We may need to allocate a thunk in low memory; reserve memory
|
|||
|
for it now. */
|
|||
|
case R_M32C_16:
|
|||
|
if (dynobj == NULL)
|
|||
|
elf_hash_table (info)->dynobj = dynobj = abfd;
|
|||
|
if (splt == NULL)
|
|||
|
{
|
|||
|
splt = bfd_get_section_by_name (dynobj, ".plt");
|
|||
|
if (splt == NULL)
|
|||
|
{
|
|||
|
splt = bfd_make_section (dynobj, ".plt");
|
|||
|
if (splt == NULL
|
|||
|
|| ! bfd_set_section_flags (dynobj, splt,
|
|||
|
(SEC_ALLOC
|
|||
|
| SEC_LOAD
|
|||
|
| SEC_HAS_CONTENTS
|
|||
|
| SEC_IN_MEMORY
|
|||
|
| SEC_LINKER_CREATED
|
|||
|
| SEC_READONLY
|
|||
|
| SEC_CODE))
|
|||
|
|| ! bfd_set_section_alignment (dynobj, splt, 1))
|
|||
|
return FALSE;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
if (h != NULL)
|
|||
|
offset = &h->plt.offset;
|
|||
|
else
|
|||
|
{
|
|||
|
if (local_plt_offsets == NULL)
|
|||
|
{
|
|||
|
size_t size;
|
|||
|
unsigned int i;
|
|||
|
|
|||
|
size = symtab_hdr->sh_info * sizeof (bfd_vma);
|
|||
|
local_plt_offsets = (bfd_vma *) bfd_alloc (abfd, size);
|
|||
|
if (local_plt_offsets == NULL)
|
|||
|
return FALSE;
|
|||
|
elf_local_got_offsets (abfd) = local_plt_offsets;
|
|||
|
|
|||
|
for (i = 0; i < symtab_hdr->sh_info; i++)
|
|||
|
local_plt_offsets[i] = (bfd_vma) -1;
|
|||
|
}
|
|||
|
offset = &local_plt_offsets[r_symndx];
|
|||
|
}
|
|||
|
|
|||
|
if (*offset == (bfd_vma) -1)
|
|||
|
{
|
|||
|
*offset = splt->size;
|
|||
|
splt->size += 4;
|
|||
|
}
|
|||
|
break;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
/* This must exist if dynobj is ever set. */
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED,
|
|||
|
struct bfd_link_info *info)
|
|||
|
{
|
|||
|
bfd *dynobj;
|
|||
|
asection *splt;
|
|||
|
|
|||
|
/* As an extra sanity check, verify that all plt entries have
|
|||
|
been filled in. */
|
|||
|
|
|||
|
if ((dynobj = elf_hash_table (info)->dynobj) != NULL
|
|||
|
&& (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL)
|
|||
|
{
|
|||
|
bfd_byte *contents = splt->contents;
|
|||
|
unsigned int i, size = splt->size;
|
|||
|
for (i = 0; i < size; i += 4)
|
|||
|
{
|
|||
|
unsigned int x = bfd_get_32 (dynobj, contents + i);
|
|||
|
BFD_ASSERT (x != 0);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
|
|||
|
struct bfd_link_info *info)
|
|||
|
{
|
|||
|
bfd *dynobj;
|
|||
|
asection *splt;
|
|||
|
|
|||
|
if (info->relocatable)
|
|||
|
return TRUE;
|
|||
|
|
|||
|
dynobj = elf_hash_table (info)->dynobj;
|
|||
|
if (dynobj == NULL)
|
|||
|
return TRUE;
|
|||
|
|
|||
|
splt = bfd_get_section_by_name (dynobj, ".plt");
|
|||
|
BFD_ASSERT (splt != NULL);
|
|||
|
|
|||
|
splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->size);
|
|||
|
if (splt->contents == NULL)
|
|||
|
return FALSE;
|
|||
|
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
/* Function to set the ELF flag bits. */
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_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
|
|||
|
m32c_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
|
|||
|
{
|
|||
|
flagword old_flags, old_partial;
|
|||
|
flagword new_flags, new_partial;
|
|||
|
bfd_boolean error = FALSE;
|
|||
|
char new_opt[80];
|
|||
|
char old_opt[80];
|
|||
|
|
|||
|
new_opt[0] = old_opt[0] = '\0';
|
|||
|
new_flags = elf_elfheader (ibfd)->e_flags;
|
|||
|
old_flags = elf_elfheader (obfd)->e_flags;
|
|||
|
|
|||
|
#ifdef DEBUG
|
|||
|
(*_bfd_error_handler) ("old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s, filename = %s",
|
|||
|
old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no",
|
|||
|
bfd_get_filename (ibfd));
|
|||
|
#endif
|
|||
|
|
|||
|
if (!elf_flags_init (obfd))
|
|||
|
{
|
|||
|
/* First call, no flags set. */
|
|||
|
elf_flags_init (obfd) = TRUE;
|
|||
|
elf_elfheader (obfd)->e_flags = new_flags;
|
|||
|
}
|
|||
|
|
|||
|
else if (new_flags == old_flags)
|
|||
|
/* Compatible flags are ok. */
|
|||
|
;
|
|||
|
|
|||
|
else /* Possibly incompatible flags. */
|
|||
|
{
|
|||
|
/* Warn if different cpu is used (allow a specific cpu to override
|
|||
|
the generic cpu). */
|
|||
|
new_partial = (new_flags & EF_M32C_CPU_MASK);
|
|||
|
old_partial = (old_flags & EF_M32C_CPU_MASK);
|
|||
|
if (new_partial == old_partial)
|
|||
|
;
|
|||
|
|
|||
|
else
|
|||
|
{
|
|||
|
switch (new_partial)
|
|||
|
{
|
|||
|
default: strcat (new_opt, " -m16c"); break;
|
|||
|
case EF_M32C_CPU_M16C: strcat (new_opt, " -m16c"); break;
|
|||
|
case EF_M32C_CPU_M32C: strcat (new_opt, " -m32c"); break;
|
|||
|
}
|
|||
|
|
|||
|
switch (old_partial)
|
|||
|
{
|
|||
|
default: strcat (old_opt, " -m16c"); break;
|
|||
|
case EF_M32C_CPU_M16C: strcat (old_opt, " -m16c"); break;
|
|||
|
case EF_M32C_CPU_M32C: strcat (old_opt, " -m32c"); break;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
/* Print out any mismatches from above. */
|
|||
|
if (new_opt[0])
|
|||
|
{
|
|||
|
error = TRUE;
|
|||
|
(*_bfd_error_handler)
|
|||
|
(_("%s: compiled with %s and linked with modules compiled with %s"),
|
|||
|
bfd_get_filename (ibfd), new_opt, old_opt);
|
|||
|
}
|
|||
|
|
|||
|
new_flags &= ~ EF_M32C_ALL_FLAGS;
|
|||
|
old_flags &= ~ EF_M32C_ALL_FLAGS;
|
|||
|
|
|||
|
/* Warn about any other mismatches. */
|
|||
|
if (new_flags != old_flags)
|
|||
|
{
|
|||
|
error = TRUE;
|
|||
|
(*_bfd_error_handler)
|
|||
|
(_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
|
|||
|
bfd_get_filename (ibfd), (long)new_flags, (long)old_flags);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
if (error)
|
|||
|
bfd_set_error (bfd_error_bad_value);
|
|||
|
|
|||
|
return !error;
|
|||
|
}
|
|||
|
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_elf_print_private_bfd_data (bfd *abfd, PTR 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:"), (long)flags);
|
|||
|
|
|||
|
switch (flags & EF_M32C_CPU_MASK)
|
|||
|
{
|
|||
|
default: break;
|
|||
|
case EF_M32C_CPU_M16C: fprintf (file, " -m16c"); break;
|
|||
|
case EF_M32C_CPU_M32C: fprintf (file, " -m32c"); break;
|
|||
|
}
|
|||
|
|
|||
|
fputc ('\n', file);
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
/* Return the MACH for an e_flags value. */
|
|||
|
|
|||
|
static int
|
|||
|
elf32_m32c_machine (bfd *abfd)
|
|||
|
{
|
|||
|
switch (elf_elfheader (abfd)->e_flags & EF_M32C_CPU_MASK)
|
|||
|
{
|
|||
|
case EF_M32C_CPU_M16C: return bfd_mach_m16c;
|
|||
|
case EF_M32C_CPU_M32C: return bfd_mach_m32c;
|
|||
|
}
|
|||
|
|
|||
|
return bfd_mach_m16c;
|
|||
|
}
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_elf_object_p (bfd *abfd)
|
|||
|
{
|
|||
|
bfd_default_set_arch_mach (abfd, bfd_arch_m32c,
|
|||
|
elf32_m32c_machine (abfd));
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
|
|||
|
#ifdef DEBUG
|
|||
|
static void
|
|||
|
dump_symtab (bfd * abfd, void *internal_syms, void *external_syms)
|
|||
|
{
|
|||
|
size_t locsymcount;
|
|||
|
Elf_Internal_Sym *isymbuf;
|
|||
|
Elf_Internal_Sym *isymend;
|
|||
|
Elf_Internal_Sym *isym;
|
|||
|
Elf_Internal_Shdr *symtab_hdr;
|
|||
|
bfd_boolean free_internal = 0, free_external = 0;
|
|||
|
char * st_info_str;
|
|||
|
char * st_info_stb_str;
|
|||
|
char * st_other_str;
|
|||
|
char * st_shndx_str;
|
|||
|
|
|||
|
if (! internal_syms)
|
|||
|
{
|
|||
|
internal_syms = bfd_malloc (1000);
|
|||
|
free_internal = 1;
|
|||
|
}
|
|||
|
if (! external_syms)
|
|||
|
{
|
|||
|
external_syms = bfd_malloc (1000);
|
|||
|
free_external = 1;
|
|||
|
}
|
|||
|
|
|||
|
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
|||
|
locsymcount = symtab_hdr->sh_size / get_elf_backend_data(abfd)->s->sizeof_sym;
|
|||
|
if (free_internal)
|
|||
|
isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
|
|||
|
symtab_hdr->sh_info, 0,
|
|||
|
internal_syms, external_syms, NULL);
|
|||
|
else
|
|||
|
isymbuf = internal_syms;
|
|||
|
isymend = isymbuf + locsymcount;
|
|||
|
|
|||
|
for (isym = isymbuf ; isym < isymend ; isym++)
|
|||
|
{
|
|||
|
switch (ELF_ST_TYPE (isym->st_info))
|
|||
|
{
|
|||
|
case STT_FUNC: st_info_str = "STT_FUNC";
|
|||
|
case STT_SECTION: st_info_str = "STT_SECTION";
|
|||
|
case STT_SRELC: st_info_str = "STT_SRELC";
|
|||
|
case STT_FILE: st_info_str = "STT_FILE";
|
|||
|
case STT_OBJECT: st_info_str = "STT_OBJECT";
|
|||
|
case STT_TLS: st_info_str = "STT_TLS";
|
|||
|
default: st_info_str = "";
|
|||
|
}
|
|||
|
switch (ELF_ST_BIND (isym->st_info))
|
|||
|
{
|
|||
|
case STB_LOCAL: st_info_stb_str = "STB_LOCAL";
|
|||
|
case STB_GLOBAL: st_info_stb_str = "STB_GLOBAL";
|
|||
|
default: st_info_stb_str = "";
|
|||
|
}
|
|||
|
switch (ELF_ST_VISIBILITY (isym->st_other))
|
|||
|
{
|
|||
|
case STV_DEFAULT: st_other_str = "STV_DEFAULT";
|
|||
|
case STV_INTERNAL: st_other_str = "STV_INTERNAL";
|
|||
|
case STV_PROTECTED: st_other_str = "STV_PROTECTED";
|
|||
|
default: st_other_str = "";
|
|||
|
}
|
|||
|
switch (isym->st_shndx)
|
|||
|
{
|
|||
|
case SHN_ABS: st_shndx_str = "SHN_ABS";
|
|||
|
case SHN_COMMON: st_shndx_str = "SHN_COMMON";
|
|||
|
case SHN_UNDEF: st_shndx_str = "SHN_UNDEF";
|
|||
|
default: st_shndx_str = "";
|
|||
|
}
|
|||
|
|
|||
|
printf ("isym = %p st_value = %lx st_size = %lx st_name = (%lu) %s "
|
|||
|
"st_info = (%d) %s %s st_other = (%d) %s st_shndx = (%d) %s\n",
|
|||
|
isym,
|
|||
|
(unsigned long) isym->st_value,
|
|||
|
(unsigned long) isym->st_size,
|
|||
|
isym->st_name,
|
|||
|
bfd_elf_string_from_elf_section (abfd, symtab_hdr->sh_link,
|
|||
|
isym->st_name),
|
|||
|
isym->st_info, st_info_str, st_info_stb_str,
|
|||
|
isym->st_other, st_other_str,
|
|||
|
isym->st_shndx, st_shndx_str);
|
|||
|
}
|
|||
|
if (free_internal)
|
|||
|
free (internal_syms);
|
|||
|
if (free_external)
|
|||
|
free (external_syms);
|
|||
|
}
|
|||
|
|
|||
|
static char *
|
|||
|
m32c_get_reloc (long reloc)
|
|||
|
{
|
|||
|
if (0 <= reloc && reloc < R_M32C_max)
|
|||
|
return m32c_elf_howto_table[reloc].name;
|
|||
|
else
|
|||
|
return "";
|
|||
|
}
|
|||
|
#endif /* DEBUG */
|
|||
|
|
|||
|
/* Handle relaxing. */
|
|||
|
|
|||
|
/* A subroutine of m32c_elf_relax_section. If the global symbol H
|
|||
|
is within the low 64k, remove any entry for it in the plt. */
|
|||
|
|
|||
|
struct relax_plt_data
|
|||
|
{
|
|||
|
asection *splt;
|
|||
|
bfd_boolean *again;
|
|||
|
};
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_relax_plt_check (struct elf_link_hash_entry *h,
|
|||
|
PTR xdata)
|
|||
|
{
|
|||
|
struct relax_plt_data *data = (struct relax_plt_data *) xdata;
|
|||
|
|
|||
|
if (h->root.type == bfd_link_hash_warning)
|
|||
|
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
|||
|
|
|||
|
if (h->plt.offset != (bfd_vma) -1)
|
|||
|
{
|
|||
|
bfd_vma address;
|
|||
|
|
|||
|
if (h->root.type == bfd_link_hash_undefined
|
|||
|
|| h->root.type == bfd_link_hash_undefweak)
|
|||
|
address = 0;
|
|||
|
else
|
|||
|
address = (h->root.u.def.section->output_section->vma
|
|||
|
+ h->root.u.def.section->output_offset
|
|||
|
+ h->root.u.def.value);
|
|||
|
|
|||
|
if (address <= 0xffff)
|
|||
|
{
|
|||
|
h->plt.offset = -1;
|
|||
|
data->splt->size -= 4;
|
|||
|
*data->again = TRUE;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
/* A subroutine of m32c_elf_relax_section. If the global symbol H
|
|||
|
previously had a plt entry, give it a new entry offset. */
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_relax_plt_realloc (struct elf_link_hash_entry *h,
|
|||
|
PTR xdata)
|
|||
|
{
|
|||
|
bfd_vma *entry = (bfd_vma *) xdata;
|
|||
|
|
|||
|
if (h->root.type == bfd_link_hash_warning)
|
|||
|
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
|||
|
|
|||
|
if (h->plt.offset != (bfd_vma) -1)
|
|||
|
{
|
|||
|
h->plt.offset = *entry;
|
|||
|
*entry += 4;
|
|||
|
}
|
|||
|
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_elf_relax_plt_section (bfd *dynobj,
|
|||
|
asection *splt,
|
|||
|
struct bfd_link_info *info,
|
|||
|
bfd_boolean *again)
|
|||
|
{
|
|||
|
struct relax_plt_data relax_plt_data;
|
|||
|
bfd *ibfd;
|
|||
|
|
|||
|
/* Assume nothing changes. */
|
|||
|
*again = FALSE;
|
|||
|
|
|||
|
if (info->relocatable)
|
|||
|
return TRUE;
|
|||
|
|
|||
|
/* We only relax the .plt section at the moment. */
|
|||
|
if (dynobj != elf_hash_table (info)->dynobj
|
|||
|
|| strcmp (splt->name, ".plt") != 0)
|
|||
|
return TRUE;
|
|||
|
|
|||
|
/* Quick check for an empty plt. */
|
|||
|
if (splt->size == 0)
|
|||
|
return TRUE;
|
|||
|
|
|||
|
/* Map across all global symbols; see which ones happen to
|
|||
|
fall in the low 64k. */
|
|||
|
relax_plt_data.splt = splt;
|
|||
|
relax_plt_data.again = again;
|
|||
|
elf_link_hash_traverse (elf_hash_table (info), m32c_relax_plt_check,
|
|||
|
&relax_plt_data);
|
|||
|
|
|||
|
/* Likewise for local symbols, though that's somewhat less convenient
|
|||
|
as we have to walk the list of input bfds and swap in symbol data. */
|
|||
|
for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
|
|||
|
{
|
|||
|
bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
|
|||
|
Elf_Internal_Shdr *symtab_hdr;
|
|||
|
Elf_Internal_Sym *isymbuf = NULL;
|
|||
|
unsigned int idx;
|
|||
|
|
|||
|
if (! local_plt_offsets)
|
|||
|
continue;
|
|||
|
|
|||
|
symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
|
|||
|
if (symtab_hdr->sh_info != 0)
|
|||
|
{
|
|||
|
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
|
|||
|
if (isymbuf == NULL)
|
|||
|
isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
|
|||
|
symtab_hdr->sh_info, 0,
|
|||
|
NULL, NULL, NULL);
|
|||
|
if (isymbuf == NULL)
|
|||
|
return FALSE;
|
|||
|
}
|
|||
|
|
|||
|
for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
|
|||
|
{
|
|||
|
Elf_Internal_Sym *isym;
|
|||
|
asection *tsec;
|
|||
|
bfd_vma address;
|
|||
|
|
|||
|
if (local_plt_offsets[idx] == (bfd_vma) -1)
|
|||
|
continue;
|
|||
|
|
|||
|
isym = &isymbuf[idx];
|
|||
|
if (isym->st_shndx == SHN_UNDEF)
|
|||
|
continue;
|
|||
|
else if (isym->st_shndx == SHN_ABS)
|
|||
|
tsec = bfd_abs_section_ptr;
|
|||
|
else if (isym->st_shndx == SHN_COMMON)
|
|||
|
tsec = bfd_com_section_ptr;
|
|||
|
else
|
|||
|
tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
|
|||
|
|
|||
|
address = (tsec->output_section->vma
|
|||
|
+ tsec->output_offset
|
|||
|
+ isym->st_value);
|
|||
|
if (address <= 0xffff)
|
|||
|
{
|
|||
|
local_plt_offsets[idx] = -1;
|
|||
|
splt->size -= 4;
|
|||
|
*again = TRUE;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
if (isymbuf != NULL
|
|||
|
&& symtab_hdr->contents != (unsigned char *) isymbuf)
|
|||
|
{
|
|||
|
if (! info->keep_memory)
|
|||
|
free (isymbuf);
|
|||
|
else
|
|||
|
{
|
|||
|
/* Cache the symbols for elf_link_input_bfd. */
|
|||
|
symtab_hdr->contents = (unsigned char *) isymbuf;
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
/* If we changed anything, walk the symbols again to reallocate
|
|||
|
.plt entry addresses. */
|
|||
|
if (*again && splt->size > 0)
|
|||
|
{
|
|||
|
bfd_vma entry = 0;
|
|||
|
|
|||
|
elf_link_hash_traverse (elf_hash_table (info),
|
|||
|
m32c_relax_plt_realloc, &entry);
|
|||
|
|
|||
|
for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
|
|||
|
{
|
|||
|
bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
|
|||
|
unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
|
|||
|
unsigned int idx;
|
|||
|
|
|||
|
if (! local_plt_offsets)
|
|||
|
continue;
|
|||
|
|
|||
|
for (idx = 0; idx < nlocals; ++idx)
|
|||
|
if (local_plt_offsets[idx] != (bfd_vma) -1)
|
|||
|
{
|
|||
|
local_plt_offsets[idx] = entry;
|
|||
|
entry += 4;
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
struct relax_reloc_s
|
|||
|
{
|
|||
|
int machine;
|
|||
|
int opcode_mask;
|
|||
|
bfd_vma opcode; /* original opcode or insn part */
|
|||
|
int relax_backward; /* lbound */
|
|||
|
int relax_forward; /* hbound */
|
|||
|
int value_shift;
|
|||
|
int mask;
|
|||
|
int new_opcode; /* new opcode */
|
|||
|
int old_reloc; /* old relocation */
|
|||
|
int new_reloc; /* new relocation */
|
|||
|
int use_pcrel;
|
|||
|
int delete_n; /* # bytes differ between original and new */
|
|||
|
};
|
|||
|
static struct relax_reloc_s relax_reloc [] =
|
|||
|
{
|
|||
|
#if 0
|
|||
|
{
|
|||
|
bfd_mach_m16c,
|
|||
|
0xff,
|
|||
|
0xfc, /* jmp.a */
|
|||
|
-32768,
|
|||
|
32767,
|
|||
|
2,
|
|||
|
0xffffff00,
|
|||
|
0xf4, /* jmp.w */
|
|||
|
R_M32C_8_ELABEL24,
|
|||
|
R_M32C_8_PCREL16,
|
|||
|
1,
|
|||
|
1,
|
|||
|
},
|
|||
|
{
|
|||
|
bfd_mach_m32c,
|
|||
|
0xff,
|
|||
|
0xcc, /* jmp.a */
|
|||
|
-32768,
|
|||
|
32767,
|
|||
|
2,
|
|||
|
0xffffff00,
|
|||
|
0xce, /* jmp.w */
|
|||
|
R_M32C_8_ELABEL24,
|
|||
|
R_M32C_8_PCREL16,
|
|||
|
1,
|
|||
|
1,
|
|||
|
},
|
|||
|
{
|
|||
|
bfd_mach_m32c,
|
|||
|
0xff,
|
|||
|
0xcd, /* jsr.a */
|
|||
|
-32768,
|
|||
|
32767,
|
|||
|
2,
|
|||
|
0xffffff00,
|
|||
|
0xcf, /* jsr.w */
|
|||
|
R_M32C_8_ELABEL24,
|
|||
|
R_M32C_8_PCREL16,
|
|||
|
1,
|
|||
|
1,
|
|||
|
},
|
|||
|
{
|
|||
|
bfd_mach_m16c,
|
|||
|
0xff,
|
|||
|
0xf4, /* jmp.w */
|
|||
|
-128,
|
|||
|
127,
|
|||
|
2,
|
|||
|
0xffffff00,
|
|||
|
0xfe, /* jmp.b */
|
|||
|
R_M32C_8_PCREL16,
|
|||
|
R_M32C_8_PCREL8,
|
|||
|
1,
|
|||
|
1,
|
|||
|
},
|
|||
|
{
|
|||
|
bfd_mach_m32c,
|
|||
|
0xff,
|
|||
|
0xce, /* jmp.w */
|
|||
|
-128,
|
|||
|
127,
|
|||
|
2,
|
|||
|
0xffffff00,
|
|||
|
0xbb, /* jmp.b */
|
|||
|
R_M32C_8_PCREL16,
|
|||
|
R_M32C_8_PCREL8,
|
|||
|
1,
|
|||
|
1,
|
|||
|
},
|
|||
|
{
|
|||
|
bfd_mach_m32c,
|
|||
|
0xc0f6,
|
|||
|
0x8096, /* dest */
|
|||
|
0,
|
|||
|
0xffff,
|
|||
|
3,
|
|||
|
0xffff3fff,
|
|||
|
0xc000, /* abs16 */
|
|||
|
R_M32C_24_ABS24,
|
|||
|
R_M32C_24_ABS16,
|
|||
|
0,
|
|||
|
1,
|
|||
|
},
|
|||
|
{
|
|||
|
bfd_mach_m32c,
|
|||
|
0xc0f6,
|
|||
|
0x80a6, /* dest */
|
|||
|
0,
|
|||
|
0xffff,
|
|||
|
4,
|
|||
|
0xffff3fff,
|
|||
|
0xc000, /* abs16 */
|
|||
|
R_M32C_32_ABS24,
|
|||
|
R_M32C_32_ABS16,
|
|||
|
0,
|
|||
|
1,
|
|||
|
},
|
|||
|
{
|
|||
|
bfd_mach_m32c,
|
|||
|
0xc0f6,
|
|||
|
0x80b6, /* dest */
|
|||
|
0,
|
|||
|
0xffff,
|
|||
|
5,
|
|||
|
0xffff3fff,
|
|||
|
0xc000, /* abs16 */
|
|||
|
R_M32C_40_ABS24,
|
|||
|
R_M32C_40_ABS16,
|
|||
|
0,
|
|||
|
1,
|
|||
|
},
|
|||
|
{
|
|||
|
bfd_mach_m32c,
|
|||
|
0x30f0,
|
|||
|
0x20b0, /* src */
|
|||
|
0,
|
|||
|
0xffff,
|
|||
|
2,
|
|||
|
0xffffcfff,
|
|||
|
0x3000, /* abs16 */
|
|||
|
R_M32C_16_ABS24,
|
|||
|
R_M32C_16_ABS16,
|
|||
|
0,
|
|||
|
1,
|
|||
|
},
|
|||
|
{
|
|||
|
bfd_mach_m32c,
|
|||
|
0xc086,
|
|||
|
0x8086, /* dest */
|
|||
|
0,
|
|||
|
0xffff,
|
|||
|
2,
|
|||
|
0xffff3fff,
|
|||
|
0xc000, /* abs16 */
|
|||
|
R_M32C_16_ABS24,
|
|||
|
R_M32C_16_ABS16,
|
|||
|
0,
|
|||
|
1,
|
|||
|
},
|
|||
|
#endif
|
|||
|
{
|
|||
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|||
|
}
|
|||
|
};
|
|||
|
static bfd_boolean
|
|||
|
m32c_elf_relax_section
|
|||
|
(bfd * abfd,
|
|||
|
asection * sec,
|
|||
|
struct bfd_link_info * link_info,
|
|||
|
bfd_boolean * again)
|
|||
|
{
|
|||
|
Elf_Internal_Shdr *symtab_hdr;
|
|||
|
Elf_Internal_Shdr *shndx_hdr;
|
|||
|
Elf_Internal_Rela *internal_relocs;
|
|||
|
Elf_Internal_Rela *free_relocs = NULL;
|
|||
|
Elf_Internal_Rela *irel, *irelend;
|
|||
|
bfd_byte * contents = NULL;
|
|||
|
bfd_byte * free_contents = NULL;
|
|||
|
Elf32_External_Sym *extsyms = NULL;
|
|||
|
Elf32_External_Sym *free_extsyms = NULL;
|
|||
|
Elf_External_Sym_Shndx *shndx_buf = NULL;
|
|||
|
int machine;
|
|||
|
|
|||
|
if (abfd == elf_hash_table (link_info)->dynobj
|
|||
|
&& strcmp (sec->name, ".plt") == 0)
|
|||
|
return m32c_elf_relax_plt_section (abfd, sec, link_info, again);
|
|||
|
|
|||
|
/* Assume nothing changes. */
|
|||
|
*again = FALSE;
|
|||
|
|
|||
|
machine = elf32_m32c_machine (abfd);
|
|||
|
|
|||
|
/* We don't have to do anything for a relocatable link, if
|
|||
|
this section does not have relocs, or if this is not a
|
|||
|
code section. */
|
|||
|
if (link_info->relocatable
|
|||
|
|| (sec->flags & SEC_RELOC) == 0
|
|||
|
|| sec->reloc_count == 0
|
|||
|
|| (sec->flags & SEC_CODE) == 0)
|
|||
|
return TRUE;
|
|||
|
|
|||
|
/* Relaxing doesn't quite work right yet. */
|
|||
|
return TRUE;
|
|||
|
|
|||
|
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
|||
|
shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
|
|||
|
|
|||
|
/* Get a copy of the native relocations. */
|
|||
|
internal_relocs = (_bfd_elf_link_read_relocs
|
|||
|
(abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
|
|||
|
link_info->keep_memory));
|
|||
|
if (internal_relocs == NULL)
|
|||
|
goto error_return;
|
|||
|
if (! link_info->keep_memory)
|
|||
|
free_relocs = internal_relocs;
|
|||
|
|
|||
|
/* Walk through them looking for relaxing opportunities. */
|
|||
|
irelend = internal_relocs + sec->reloc_count;
|
|||
|
|
|||
|
for (irel = internal_relocs; irel < irelend; irel++)
|
|||
|
{
|
|||
|
bfd_vma symval;
|
|||
|
bfd_vma insn;
|
|||
|
bfd_vma pc;
|
|||
|
bfd_signed_vma pcrel_value;
|
|||
|
bfd_vma addend;
|
|||
|
int to_delete;
|
|||
|
int i;
|
|||
|
|
|||
|
/* Get the section contents. */
|
|||
|
if (contents == NULL)
|
|||
|
{
|
|||
|
if (elf_section_data (sec)->this_hdr.contents != NULL)
|
|||
|
contents = elf_section_data (sec)->this_hdr.contents;
|
|||
|
/* Go get them off disk. */
|
|||
|
else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
|
|||
|
goto error_return;
|
|||
|
}
|
|||
|
|
|||
|
/* Read this BFD's symbols if we haven't done so already. */
|
|||
|
if (extsyms == NULL)
|
|||
|
{
|
|||
|
/* Get cached copy if it exists. */
|
|||
|
if (symtab_hdr->contents != NULL)
|
|||
|
extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
|
|||
|
else
|
|||
|
{
|
|||
|
bfd_size_type amt = symtab_hdr->sh_size;
|
|||
|
|
|||
|
/* Go get them off disk. */
|
|||
|
extsyms = (Elf32_External_Sym *) bfd_malloc (amt);
|
|||
|
if (extsyms == NULL)
|
|||
|
goto error_return;
|
|||
|
free_extsyms = extsyms;
|
|||
|
if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
|
|||
|
|| bfd_bread (extsyms, amt, abfd) != amt)
|
|||
|
goto error_return;
|
|||
|
symtab_hdr->contents = (bfd_byte *) extsyms;
|
|||
|
}
|
|||
|
|
|||
|
if (shndx_hdr->sh_size != 0)
|
|||
|
{
|
|||
|
bfd_size_type amt;
|
|||
|
|
|||
|
amt = symtab_hdr->sh_info;
|
|||
|
amt *= sizeof (Elf_External_Sym_Shndx);
|
|||
|
shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
|
|||
|
if (shndx_buf == NULL)
|
|||
|
goto error_return;
|
|||
|
if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
|
|||
|
|| bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
|
|||
|
goto error_return;
|
|||
|
shndx_hdr->contents = (bfd_byte *) shndx_buf;
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
/* Get the value of the symbol referred to by the reloc. */
|
|||
|
if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
|
|||
|
{
|
|||
|
/* A local symbol. */
|
|||
|
Elf32_External_Sym *esym;
|
|||
|
Elf_External_Sym_Shndx *shndx;
|
|||
|
Elf_Internal_Sym isym;
|
|||
|
|
|||
|
esym = extsyms + ELF32_R_SYM (irel->r_info);
|
|||
|
shndx = shndx_buf + (shndx_buf ? ELF32_R_SYM (irel->r_info) : 0);
|
|||
|
bfd_elf32_swap_symbol_in (abfd, esym, shndx, &isym);
|
|||
|
|
|||
|
symval = (isym.st_value
|
|||
|
+ sec->output_section->vma
|
|||
|
+ sec->output_offset);
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
unsigned long indx;
|
|||
|
struct elf_link_hash_entry *h;
|
|||
|
|
|||
|
/* An external symbol. */
|
|||
|
indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
|
|||
|
h = elf_sym_hashes (abfd)[indx];
|
|||
|
BFD_ASSERT (h != NULL);
|
|||
|
|
|||
|
if (h->root.type != bfd_link_hash_defined
|
|||
|
&& h->root.type != bfd_link_hash_defweak)
|
|||
|
/* This appears to be a reference to an undefined
|
|||
|
symbol. Just ignore it--it will be caught by the
|
|||
|
regular reloc processing. */
|
|||
|
continue;
|
|||
|
|
|||
|
symval = (h->root.u.def.value
|
|||
|
+ h->root.u.def.section->output_section->vma
|
|||
|
+ h->root.u.def.section->output_offset);
|
|||
|
}
|
|||
|
|
|||
|
/* There will always be room for the relaxed insn, since it is smaller
|
|||
|
than the one it would replace. */
|
|||
|
BFD_ASSERT (irel->r_offset <= sec->size - 2);
|
|||
|
|
|||
|
insn = bfd_get_16 (abfd, contents + irel->r_offset + 0);
|
|||
|
|
|||
|
addend = irel->r_addend;
|
|||
|
for (i = 0; relax_reloc[i].machine; i++)
|
|||
|
{
|
|||
|
#ifdef DEBUG
|
|||
|
_bfd_error_handler ("insn %x %d mask %x opcode %x =%x\n",
|
|||
|
insn, i, relax_reloc[i].opcode_mask,
|
|||
|
relax_reloc[i].opcode,
|
|||
|
(insn & relax_reloc[i].opcode_mask) == relax_reloc[i].opcode);
|
|||
|
#endif
|
|||
|
if (!(machine == relax_reloc[i].machine
|
|||
|
&& (insn & relax_reloc[i].opcode_mask) == relax_reloc[i].opcode
|
|||
|
&& (relax_reloc[i].old_reloc
|
|||
|
== (int) ELF32_R_TYPE(irel->r_info))))
|
|||
|
continue;
|
|||
|
|
|||
|
/* At this point we've confirmed we have a matching insn. Now
|
|||
|
ensure the operand is in range. */
|
|||
|
if (relax_reloc[i].use_pcrel)
|
|||
|
{
|
|||
|
pc = sec->output_section->vma + sec->output_offset
|
|||
|
+ irel->r_offset;
|
|||
|
pcrel_value = symval - pc;
|
|||
|
#ifndef USE_REL /* put in for learning purposes */
|
|||
|
pcrel_value += addend;
|
|||
|
#else
|
|||
|
addend = bfd_get_signed_16 (abfd, contents + irel->r_offset + 2);
|
|||
|
pcrel_value += addend;
|
|||
|
#endif
|
|||
|
}
|
|||
|
else
|
|||
|
pcrel_value = symval;
|
|||
|
|
|||
|
if (pcrel_value >= relax_reloc[i].relax_backward
|
|||
|
&& pcrel_value < relax_reloc[i].relax_forward + 2)
|
|||
|
{
|
|||
|
/* We can relax to a shorter operand. */
|
|||
|
insn = (insn & relax_reloc[i].mask) | relax_reloc[i].new_opcode;
|
|||
|
|
|||
|
to_delete = relax_reloc[i].delete_n;
|
|||
|
|
|||
|
/* Rewrite the insn. */
|
|||
|
bfd_put_16 (abfd, insn, contents + irel->r_offset);
|
|||
|
|
|||
|
/* Set the new reloc type. */
|
|||
|
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
|||
|
relax_reloc[i].new_reloc);
|
|||
|
irel->r_addend = pcrel_value;
|
|||
|
}
|
|||
|
else
|
|||
|
continue;
|
|||
|
|
|||
|
#ifdef DEBUG
|
|||
|
_bfd_error_handler ("insn %x pc %x index %d mask %x shift %d delete %d\n"
|
|||
|
"old reloc %s new reloc %s",
|
|||
|
insn, sec->output_section->vma
|
|||
|
+ sec->output_offset + irel->r_offset + 2,
|
|||
|
i, relax_reloc[i].opcode_mask,
|
|||
|
relax_reloc[i].value_shift, to_delete,
|
|||
|
m32c_get_reloc (relax_reloc[i].old_reloc),
|
|||
|
m32c_get_reloc (relax_reloc[i].new_reloc));
|
|||
|
#endif
|
|||
|
|
|||
|
/* Note that we've changed the relocs, section contents, etc. */
|
|||
|
elf_section_data (sec)->relocs = internal_relocs;
|
|||
|
free_relocs = NULL;
|
|||
|
|
|||
|
elf_section_data (sec)->this_hdr.contents = contents;
|
|||
|
free_contents = NULL;
|
|||
|
|
|||
|
symtab_hdr->contents = (bfd_byte *) extsyms;
|
|||
|
free_extsyms = NULL;
|
|||
|
|
|||
|
/* Delete TO_DELETE bytes of data. */
|
|||
|
if (! m32c_elf_relax_delete_bytes
|
|||
|
(abfd, sec, irel->r_offset + relax_reloc[i].value_shift,
|
|||
|
to_delete))
|
|||
|
goto error_return;
|
|||
|
} /* next relax_reloc */
|
|||
|
} /* next relocation */
|
|||
|
|
|||
|
if (free_relocs != NULL)
|
|||
|
{
|
|||
|
free (free_relocs);
|
|||
|
free_relocs = NULL;
|
|||
|
}
|
|||
|
|
|||
|
if (free_contents != NULL)
|
|||
|
{
|
|||
|
if (! link_info->keep_memory)
|
|||
|
free (free_contents);
|
|||
|
/* Cache the section contents for elf_link_input_bfd. */
|
|||
|
else
|
|||
|
elf_section_data (sec)->this_hdr.contents = contents;
|
|||
|
|
|||
|
free_contents = NULL;
|
|||
|
}
|
|||
|
|
|||
|
if (shndx_buf != NULL)
|
|||
|
{
|
|||
|
shndx_hdr->contents = NULL;
|
|||
|
free (shndx_buf);
|
|||
|
}
|
|||
|
|
|||
|
if (free_extsyms != NULL)
|
|||
|
{
|
|||
|
if (! link_info->keep_memory)
|
|||
|
free (free_extsyms);
|
|||
|
/* Cache the symbols for elf_link_input_bfd. */
|
|||
|
else
|
|||
|
symtab_hdr->contents = NULL /* (unsigned char *) extsyms*/;
|
|||
|
|
|||
|
free_extsyms = NULL;
|
|||
|
}
|
|||
|
/* elf_link_input_bfd expects internal syms. */
|
|||
|
symtab_hdr->contents = NULL;
|
|||
|
|
|||
|
return TRUE;
|
|||
|
|
|||
|
error_return:
|
|||
|
if (free_relocs != NULL)
|
|||
|
free (free_relocs);
|
|||
|
if (free_contents != NULL)
|
|||
|
free (free_contents);
|
|||
|
if (shndx_buf != NULL)
|
|||
|
{
|
|||
|
shndx_hdr->contents = NULL;
|
|||
|
free (shndx_buf);
|
|||
|
}
|
|||
|
if (free_extsyms != NULL)
|
|||
|
free (free_extsyms);
|
|||
|
return FALSE;
|
|||
|
}
|
|||
|
|
|||
|
/* Delete some bytes from a section while relaxing. */
|
|||
|
|
|||
|
static bfd_boolean
|
|||
|
m32c_elf_relax_delete_bytes
|
|||
|
(bfd * abfd,
|
|||
|
asection * sec,
|
|||
|
bfd_vma addr,
|
|||
|
int count)
|
|||
|
{
|
|||
|
Elf_Internal_Shdr *symtab_hdr;
|
|||
|
Elf_Internal_Shdr *shndx_hdr;
|
|||
|
int sec_shndx;
|
|||
|
bfd_byte *contents;
|
|||
|
Elf_Internal_Rela *irel;
|
|||
|
Elf_Internal_Rela *irelend;
|
|||
|
Elf_Internal_Rela *irelalign;
|
|||
|
bfd_vma toaddr;
|
|||
|
Elf32_External_Sym *esym;
|
|||
|
Elf32_External_Sym *esymend;
|
|||
|
Elf32_External_Sym *extsyms;
|
|||
|
Elf_External_Sym_Shndx *shndx_buf;
|
|||
|
Elf_External_Sym_Shndx *shndx;
|
|||
|
struct elf_link_hash_entry ** sym_hashes;
|
|||
|
struct elf_link_hash_entry ** end_hashes;
|
|||
|
unsigned int symcount;
|
|||
|
|
|||
|
symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
|
|||
|
extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
|
|||
|
shndx_hdr = & elf_tdata (abfd)->symtab_shndx_hdr;
|
|||
|
shndx_buf = (Elf_External_Sym_Shndx *) shndx_hdr->contents;
|
|||
|
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
|
|||
|
contents = elf_section_data (sec)->this_hdr.contents;
|
|||
|
|
|||
|
/* The deletion must stop at the next ALIGN reloc for an aligment
|
|||
|
power larger than the number of bytes we are deleting. */
|
|||
|
irelalign = NULL;
|
|||
|
toaddr = sec->size;
|
|||
|
|
|||
|
irel = elf_section_data (sec)->relocs;
|
|||
|
irelend = irel + sec->reloc_count;
|
|||
|
|
|||
|
/* Actually delete the bytes. */
|
|||
|
memmove (contents + addr, contents + addr + count, (size_t) (toaddr - addr - count));
|
|||
|
sec->size -= count;
|
|||
|
|
|||
|
/* Adjust all the relocs. */
|
|||
|
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel ++)
|
|||
|
{
|
|||
|
/* Get the new reloc address. */
|
|||
|
if (irel->r_offset > addr && irel->r_offset < toaddr)
|
|||
|
irel->r_offset -= count;
|
|||
|
if (irel->r_addend > addr && irel->r_addend < toaddr)
|
|||
|
irel->r_addend -= count;
|
|||
|
}
|
|||
|
|
|||
|
/* Adjust the local symbols defined in this section. */
|
|||
|
shndx = shndx_buf;
|
|||
|
esym = extsyms;
|
|||
|
esymend = esym + symtab_hdr->sh_info;
|
|||
|
for (; esym < esymend; esym++, shndx = (shndx ? shndx + 1 : NULL))
|
|||
|
{
|
|||
|
Elf_Internal_Sym isym;
|
|||
|
Elf_External_Sym_Shndx dummy;
|
|||
|
|
|||
|
bfd_elf32_swap_symbol_in (abfd, esym, shndx, &isym);
|
|||
|
|
|||
|
if ((int) isym.st_shndx == sec_shndx
|
|||
|
&& isym.st_value > addr
|
|||
|
&& isym.st_value < toaddr)
|
|||
|
{
|
|||
|
isym.st_value -= count;
|
|||
|
bfd_elf32_swap_symbol_out (abfd, &isym, (PTR) esym, (PTR) & dummy);
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
/* Now adjust the global symbols defined in this section. */
|
|||
|
symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
|
|||
|
- symtab_hdr->sh_info);
|
|||
|
sym_hashes = elf_sym_hashes (abfd);
|
|||
|
// sym_hashes += symtab_hdr->sh_info;
|
|||
|
end_hashes = sym_hashes + symcount;
|
|||
|
|
|||
|
for (; sym_hashes < end_hashes; sym_hashes ++)
|
|||
|
{
|
|||
|
struct elf_link_hash_entry * sym_hash = * sym_hashes;
|
|||
|
|
|||
|
if (sym_hash &&
|
|||
|
( sym_hash->root.type == bfd_link_hash_defined
|
|||
|
|| sym_hash->root.type == bfd_link_hash_defweak)
|
|||
|
&& sym_hash->root.u.def.section == sec
|
|||
|
&& sym_hash->root.u.def.value > addr
|
|||
|
&& sym_hash->root.u.def.value < toaddr)
|
|||
|
sym_hash->root.u.def.value -= count;
|
|||
|
}
|
|||
|
|
|||
|
return TRUE;
|
|||
|
}
|
|||
|
|
|||
|
|
|||
|
#define ELF_ARCH bfd_arch_m32c
|
|||
|
#define ELF_MACHINE_CODE EM_M32C
|
|||
|
#define ELF_MAXPAGESIZE 0x1000
|
|||
|
|
|||
|
#if 0
|
|||
|
#define TARGET_BIG_SYM bfd_elf32_m32c_vec
|
|||
|
#define TARGET_BIG_NAME "elf32-m32c"
|
|||
|
#else
|
|||
|
#define TARGET_LITTLE_SYM bfd_elf32_m32c_vec
|
|||
|
#define TARGET_LITTLE_NAME "elf32-m32c"
|
|||
|
#endif
|
|||
|
|
|||
|
#define elf_info_to_howto_rel NULL
|
|||
|
#define elf_info_to_howto m32c_info_to_howto_rela
|
|||
|
#define elf_backend_object_p m32c_elf_object_p
|
|||
|
#define elf_backend_relocate_section m32c_elf_relocate_section
|
|||
|
#define elf_backend_gc_mark_hook m32c_elf_gc_mark_hook
|
|||
|
#define elf_backend_gc_sweep_hook m32c_elf_gc_sweep_hook
|
|||
|
#define elf_backend_check_relocs m32c_elf_check_relocs
|
|||
|
#define elf_backend_object_p m32c_elf_object_p
|
|||
|
#define elf_symbol_leading_char ('_')
|
|||
|
#define elf_backend_always_size_sections \
|
|||
|
m32c_elf_always_size_sections
|
|||
|
#define elf_backend_finish_dynamic_sections \
|
|||
|
m32c_elf_finish_dynamic_sections
|
|||
|
|
|||
|
#define elf_backend_can_gc_sections 1
|
|||
|
|
|||
|
#define bfd_elf32_bfd_reloc_type_lookup m32c_reloc_type_lookup
|
|||
|
#define bfd_elf32_bfd_relax_section m32c_elf_relax_section
|
|||
|
#define bfd_elf32_bfd_set_private_flags m32c_elf_set_private_flags
|
|||
|
#define bfd_elf32_bfd_merge_private_bfd_data m32c_elf_merge_private_bfd_data
|
|||
|
#define bfd_elf32_bfd_print_private_bfd_data m32c_elf_print_private_bfd_data
|
|||
|
|
|||
|
#include "elf32-target.h"
|