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https://sourceware.org/git/binutils-gdb.git
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fd67aa1129
Adds two new external authors to etc/update-copyright.py to cover bfd/ax_tls.m4, and adds gprofng to dirs handled automatically, then updates copyright messages as follows: 1) Update cgen/utils.scm emitted copyrights. 2) Run "etc/update-copyright.py --this-year" with an extra external author I haven't committed, 'Kalray SA.', to cover gas testsuite files (which should have their copyright message removed). 3) Build with --enable-maintainer-mode --enable-cgen-maint=yes. 4) Check out */po/*.pot which we don't update frequently.
1758 lines
50 KiB
C
1758 lines
50 KiB
C
/* BFD back-end for Renesas H8/300 ELF binaries.
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Copyright (C) 1993-2024 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/h8.h"
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#include "cpu-h8300.h"
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static reloc_howto_type *elf32_h8_reloc_type_lookup
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(bfd *abfd, bfd_reloc_code_real_type code);
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static bool elf32_h8_info_to_howto
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(bfd *, arelent *, Elf_Internal_Rela *);
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static bool elf32_h8_info_to_howto_rel
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(bfd *, arelent *, Elf_Internal_Rela *);
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static unsigned long elf32_h8_mach (flagword);
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static bool elf32_h8_object_p (bfd *);
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static bool elf32_h8_merge_private_bfd_data
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(bfd *, struct bfd_link_info *);
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static bool elf32_h8_relax_section
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(bfd *, asection *, struct bfd_link_info *, bool *);
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static bool elf32_h8_relax_delete_bytes
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(bfd *, asection *, bfd_vma, int);
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static bool elf32_h8_symbol_address_p (bfd *, asection *, bfd_vma);
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static bfd_byte *elf32_h8_get_relocated_section_contents
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(bfd *, struct bfd_link_info *, struct bfd_link_order *,
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bfd_byte *, bool, asymbol **);
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static bfd_reloc_status_type elf32_h8_final_link_relocate
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(unsigned long, bfd *, bfd *, asection *,
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bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
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struct bfd_link_info *, asection *, int);
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static int elf32_h8_relocate_section
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(bfd *, struct bfd_link_info *, bfd *, asection *,
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bfd_byte *, Elf_Internal_Rela *,
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Elf_Internal_Sym *, asection **);
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static bfd_reloc_status_type special
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(bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
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/* This does not include any relocation information, but should be
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good enough for GDB or objdump to read the file. */
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static reloc_howto_type h8_elf_howto_table[] =
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{
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#define R_H8_NONE_X 0
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HOWTO (R_H8_NONE, /* type */
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0, /* rightshift */
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0, /* size */
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0, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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special, /* special_function */
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"R_H8_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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#define R_H8_DIR32_X (R_H8_NONE_X + 1)
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HOWTO (R_H8_DIR32, /* type */
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0, /* rightshift */
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4, /* size */
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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_dont,/* complain_on_overflow */
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special, /* special_function */
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"R_H8_DIR32", /* 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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#define R_H8_DIR16_X (R_H8_DIR32_X + 1)
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HOWTO (R_H8_DIR16, /* type */
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0, /* rightshift */
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2, /* size */
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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_dont,/* complain_on_overflow */
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special, /* special_function */
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"R_H8_DIR16", /* 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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#define R_H8_DIR8_X (R_H8_DIR16_X + 1)
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HOWTO (R_H8_DIR8, /* type */
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0, /* rightshift */
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1, /* size */
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8, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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special, /* special_function */
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"R_H8_DIR8", /* 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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false), /* pcrel_offset */
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#define R_H8_DIR16A8_X (R_H8_DIR8_X + 1)
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HOWTO (R_H8_DIR16A8, /* type */
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0, /* rightshift */
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2, /* size */
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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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special, /* special_function */
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"R_H8_DIR16A8", /* 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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#define R_H8_DIR16R8_X (R_H8_DIR16A8_X + 1)
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HOWTO (R_H8_DIR16R8, /* type */
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0, /* rightshift */
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2, /* size */
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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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special, /* special_function */
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"R_H8_DIR16R8", /* 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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#define R_H8_DIR24A8_X (R_H8_DIR16R8_X + 1)
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HOWTO (R_H8_DIR24A8, /* type */
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0, /* rightshift */
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4, /* size */
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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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special, /* special_function */
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"R_H8_DIR24A8", /* name */
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true, /* partial_inplace */
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0xff000000, /* src_mask */
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0x00ffffff, /* dst_mask */
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false), /* pcrel_offset */
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#define R_H8_DIR24R8_X (R_H8_DIR24A8_X + 1)
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HOWTO (R_H8_DIR24R8, /* type */
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0, /* rightshift */
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4, /* size */
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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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special, /* special_function */
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"R_H8_DIR24R8", /* name */
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true, /* partial_inplace */
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0xff000000, /* src_mask */
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0x00ffffff, /* dst_mask */
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false), /* pcrel_offset */
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#define R_H8_DIR32A16_X (R_H8_DIR24R8_X + 1)
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HOWTO (R_H8_DIR32A16, /* type */
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0, /* rightshift */
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4, /* size */
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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_dont,/* complain_on_overflow */
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special, /* special_function */
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"R_H8_DIR32A16", /* 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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#define R_H8_DISP32A16_X (R_H8_DIR32A16_X + 1)
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HOWTO (R_H8_DISP32A16, /* type */
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0, /* rightshift */
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4, /* size */
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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_dont,/* complain_on_overflow */
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special, /* special_function */
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"R_H8_DISP32A16", /* 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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#define R_H8_PCREL16_X (R_H8_DISP32A16_X + 1)
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HOWTO (R_H8_PCREL16, /* type */
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0, /* rightshift */
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2, /* size */
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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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special, /* special_function */
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"R_H8_PCREL16", /* name */
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false, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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true), /* pcrel_offset */
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#define R_H8_PCREL8_X (R_H8_PCREL16_X + 1)
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HOWTO (R_H8_PCREL8, /* type */
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0, /* rightshift */
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1, /* size */
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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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special, /* special_function */
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"R_H8_PCREL8", /* name */
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false, /* partial_inplace */
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0xff, /* src_mask */
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0xff, /* dst_mask */
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true), /* pcrel_offset */
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};
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/* This structure is used to map BFD reloc codes to H8 ELF relocs. */
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struct elf_reloc_map {
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bfd_reloc_code_real_type bfd_reloc_val;
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unsigned char howto_index;
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};
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/* An array mapping BFD reloc codes to H8 ELF relocs. */
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static const struct elf_reloc_map h8_reloc_map[] = {
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{ BFD_RELOC_NONE, R_H8_NONE_X },
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{ BFD_RELOC_32, R_H8_DIR32_X },
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{ BFD_RELOC_16, R_H8_DIR16_X },
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{ BFD_RELOC_8, R_H8_DIR8_X },
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{ BFD_RELOC_H8_DIR16A8, R_H8_DIR16A8_X },
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{ BFD_RELOC_H8_DIR16R8, R_H8_DIR16R8_X },
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{ BFD_RELOC_H8_DIR24A8, R_H8_DIR24A8_X },
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{ BFD_RELOC_H8_DIR24R8, R_H8_DIR24R8_X },
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{ BFD_RELOC_H8_DIR32A16, R_H8_DIR32A16_X },
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{ BFD_RELOC_H8_DISP32A16, R_H8_DISP32A16_X },
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{ BFD_RELOC_16_PCREL, R_H8_PCREL16_X },
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{ BFD_RELOC_8_PCREL, R_H8_PCREL8_X },
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};
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static reloc_howto_type *
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elf32_h8_reloc_type_lookup (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 = 0; i < sizeof (h8_reloc_map) / sizeof (struct elf_reloc_map); i++)
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{
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if (h8_reloc_map[i].bfd_reloc_val == code)
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return &h8_elf_howto_table[(int) h8_reloc_map[i].howto_index];
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}
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return NULL;
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}
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static reloc_howto_type *
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elf32_h8_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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const char *r_name)
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{
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unsigned int i;
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for (i = 0;
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i < sizeof (h8_elf_howto_table) / sizeof (h8_elf_howto_table[0]);
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i++)
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if (h8_elf_howto_table[i].name != NULL
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&& strcasecmp (h8_elf_howto_table[i].name, r_name) == 0)
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return &h8_elf_howto_table[i];
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return NULL;
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}
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static bool
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elf32_h8_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
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Elf_Internal_Rela *elf_reloc)
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{
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unsigned int r;
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unsigned int i;
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r = ELF32_R_TYPE (elf_reloc->r_info);
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for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (reloc_howto_type); i++)
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if (h8_elf_howto_table[i].type == r)
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{
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bfd_reloc->howto = &h8_elf_howto_table[i];
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return true;
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}
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/* xgettext:c-format */
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_bfd_error_handler (_("%pB: unsupported relocation type %#x"), abfd, r);
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bfd_set_error (bfd_error_bad_value);
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return false;
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}
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static bool
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elf32_h8_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
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arelent *bfd_reloc ATTRIBUTE_UNUSED,
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Elf_Internal_Rela *elf_reloc ATTRIBUTE_UNUSED)
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{
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return false;
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}
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/* Special handling for H8/300 relocs.
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We only come here for pcrel stuff and return normally if not an -r link.
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When doing -r, we can't do any arithmetic for the pcrel stuff, because
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we support relaxing on the H8/300 series chips. */
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static bfd_reloc_status_type
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special (bfd *abfd ATTRIBUTE_UNUSED,
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arelent *reloc_entry ATTRIBUTE_UNUSED,
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asymbol *symbol ATTRIBUTE_UNUSED,
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void * data ATTRIBUTE_UNUSED,
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asection *input_section ATTRIBUTE_UNUSED,
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bfd *output_bfd,
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char **error_message ATTRIBUTE_UNUSED)
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{
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if (output_bfd == (bfd *) NULL)
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return bfd_reloc_continue;
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/* Adjust the reloc address to that in the output section. */
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reloc_entry->address += input_section->output_offset;
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return bfd_reloc_ok;
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}
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/* Perform a relocation as part of a final link. */
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static bfd_reloc_status_type
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elf32_h8_final_link_relocate (unsigned long r_type, bfd *input_bfd,
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bfd *output_bfd ATTRIBUTE_UNUSED,
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asection *input_section ATTRIBUTE_UNUSED,
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bfd_byte *contents, bfd_vma offset,
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bfd_vma value, bfd_vma addend,
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struct bfd_link_info *info ATTRIBUTE_UNUSED,
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asection *sym_sec ATTRIBUTE_UNUSED,
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int is_local ATTRIBUTE_UNUSED)
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{
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bfd_byte *hit_data = contents + offset;
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switch (r_type)
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{
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case R_H8_NONE:
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return bfd_reloc_ok;
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|
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case R_H8_DIR32:
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case R_H8_DIR32A16:
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case R_H8_DISP32A16:
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case R_H8_DIR24A8:
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value += addend;
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bfd_put_32 (input_bfd, value, hit_data);
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return bfd_reloc_ok;
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|
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case R_H8_DIR16:
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case R_H8_DIR16A8:
|
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case R_H8_DIR16R8:
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value += addend;
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bfd_put_16 (input_bfd, value, hit_data);
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return bfd_reloc_ok;
|
||
|
||
/* AKA R_RELBYTE */
|
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case R_H8_DIR8:
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value += addend;
|
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|
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bfd_put_8 (input_bfd, value, hit_data);
|
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return bfd_reloc_ok;
|
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|
||
case R_H8_DIR24R8:
|
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value += addend;
|
||
|
||
/* HIT_DATA is the address for the first byte for the relocated
|
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value. Subtract 1 so that we can manipulate the data in 32-bit
|
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hunks. */
|
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hit_data--;
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|
||
/* Clear out the top byte in value. */
|
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value &= 0xffffff;
|
||
|
||
/* Retrieve the type byte for value from the section contents. */
|
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value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000);
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|
||
/* Now scribble it out in one 32-bit hunk. */
|
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bfd_put_32 (input_bfd, value, hit_data);
|
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return bfd_reloc_ok;
|
||
|
||
case R_H8_PCREL16:
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value -= (input_section->output_section->vma
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+ input_section->output_offset);
|
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value -= offset;
|
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value += addend;
|
||
|
||
/* The value is relative to the start of the instruction,
|
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not the relocation offset. Subtract 2 to account for
|
||
this minor issue. */
|
||
value -= 2;
|
||
|
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bfd_put_16 (input_bfd, value, hit_data);
|
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return bfd_reloc_ok;
|
||
|
||
case R_H8_PCREL8:
|
||
value -= (input_section->output_section->vma
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||
+ input_section->output_offset);
|
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value -= offset;
|
||
value += addend;
|
||
|
||
/* The value is relative to the start of the instruction,
|
||
not the relocation offset. Subtract 1 to account for
|
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this minor issue. */
|
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value -= 1;
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bfd_put_8 (input_bfd, value, hit_data);
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return bfd_reloc_ok;
|
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|
||
default:
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return bfd_reloc_notsupported;
|
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}
|
||
}
|
||
|
||
/* Relocate an H8 ELF section. */
|
||
static int
|
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elf32_h8_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
|
||
bfd *input_bfd, asection *input_section,
|
||
bfd_byte *contents, Elf_Internal_Rela *relocs,
|
||
Elf_Internal_Sym *local_syms,
|
||
asection **local_sections)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
Elf_Internal_Rela *rel, *relend;
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
|
||
rel = relocs;
|
||
relend = relocs + input_section->reloc_count;
|
||
for (; rel < relend; rel++)
|
||
{
|
||
unsigned int r_type;
|
||
unsigned long r_symndx;
|
||
Elf_Internal_Sym *sym;
|
||
asection *sec;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_vma relocation;
|
||
bfd_reloc_status_type r;
|
||
arelent bfd_reloc;
|
||
reloc_howto_type *howto;
|
||
|
||
if (! elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel))
|
||
continue;
|
||
howto = bfd_reloc.howto;
|
||
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
r_type = 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);
|
||
}
|
||
else
|
||
{
|
||
bool unresolved_reloc, 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);
|
||
}
|
||
|
||
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;
|
||
|
||
r = elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd,
|
||
input_section,
|
||
contents, rel->r_offset,
|
||
relocation, rel->r_addend,
|
||
info, sec, h == NULL);
|
||
|
||
if (r != bfd_reloc_ok)
|
||
{
|
||
const char *name;
|
||
const char *msg = (const char *) 0;
|
||
|
||
if (h != NULL)
|
||
name = h->root.root.string;
|
||
else
|
||
{
|
||
name = (bfd_elf_string_from_elf_section
|
||
(input_bfd, symtab_hdr->sh_link, sym->st_name));
|
||
if (name == NULL || *name == '\0')
|
||
name = bfd_section_name (sec);
|
||
}
|
||
|
||
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");
|
||
goto common_error;
|
||
|
||
case bfd_reloc_notsupported:
|
||
msg = _("internal error: unsupported relocation error");
|
||
goto common_error;
|
||
|
||
case bfd_reloc_dangerous:
|
||
msg = _("internal error: dangerous error");
|
||
goto common_error;
|
||
|
||
default:
|
||
msg = _("internal error: unknown error");
|
||
/* fall through */
|
||
|
||
common_error:
|
||
(*info->callbacks->warning) (info, msg, name, input_bfd,
|
||
input_section, rel->r_offset);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Object files encode the specific H8 model they were compiled
|
||
for in the ELF flags field.
|
||
|
||
Examine that field and return the proper BFD machine type for
|
||
the object file. */
|
||
static unsigned long
|
||
elf32_h8_mach (flagword flags)
|
||
{
|
||
switch (flags & EF_H8_MACH)
|
||
{
|
||
case E_H8_MACH_H8300:
|
||
default:
|
||
return bfd_mach_h8300;
|
||
|
||
case E_H8_MACH_H8300H:
|
||
return bfd_mach_h8300h;
|
||
|
||
case E_H8_MACH_H8300S:
|
||
return bfd_mach_h8300s;
|
||
|
||
case E_H8_MACH_H8300HN:
|
||
return bfd_mach_h8300hn;
|
||
|
||
case E_H8_MACH_H8300SN:
|
||
return bfd_mach_h8300sn;
|
||
|
||
case E_H8_MACH_H8300SX:
|
||
return bfd_mach_h8300sx;
|
||
|
||
case E_H8_MACH_H8300SXN:
|
||
return bfd_mach_h8300sxn;
|
||
}
|
||
}
|
||
|
||
/* The final processing done just before writing out a H8 ELF object
|
||
file. We use this opportunity to encode the BFD machine type
|
||
into the flags field in the object file. */
|
||
|
||
static bool
|
||
elf32_h8_final_write_processing (bfd *abfd)
|
||
{
|
||
unsigned long val;
|
||
|
||
switch (bfd_get_mach (abfd))
|
||
{
|
||
default:
|
||
case bfd_mach_h8300:
|
||
val = E_H8_MACH_H8300;
|
||
break;
|
||
|
||
case bfd_mach_h8300h:
|
||
val = E_H8_MACH_H8300H;
|
||
break;
|
||
|
||
case bfd_mach_h8300s:
|
||
val = E_H8_MACH_H8300S;
|
||
break;
|
||
|
||
case bfd_mach_h8300hn:
|
||
val = E_H8_MACH_H8300HN;
|
||
break;
|
||
|
||
case bfd_mach_h8300sn:
|
||
val = E_H8_MACH_H8300SN;
|
||
break;
|
||
|
||
case bfd_mach_h8300sx:
|
||
val = E_H8_MACH_H8300SX;
|
||
break;
|
||
|
||
case bfd_mach_h8300sxn:
|
||
val = E_H8_MACH_H8300SXN;
|
||
break;
|
||
}
|
||
|
||
elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH);
|
||
elf_elfheader (abfd)->e_flags |= val;
|
||
return _bfd_elf_final_write_processing (abfd);
|
||
}
|
||
|
||
/* Return nonzero if ABFD represents a valid H8 ELF object file; also
|
||
record the encoded machine type found in the ELF flags. */
|
||
|
||
static bool
|
||
elf32_h8_object_p (bfd *abfd)
|
||
{
|
||
bfd_default_set_arch_mach (abfd, bfd_arch_h8300,
|
||
elf32_h8_mach (elf_elfheader (abfd)->e_flags));
|
||
return true;
|
||
}
|
||
|
||
/* Merge backend specific data from an object file to the output
|
||
object file when linking. The only data we need to copy at this
|
||
time is the architecture/machine information. */
|
||
|
||
static bool
|
||
elf32_h8_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
|
||
{
|
||
bfd *obfd = info->output_bfd;
|
||
|
||
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
|
||
|| bfd_get_flavour (obfd) != bfd_target_elf_flavour)
|
||
return true;
|
||
|
||
if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
|
||
&& bfd_get_mach (obfd) < bfd_get_mach (ibfd))
|
||
{
|
||
if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
|
||
bfd_get_mach (ibfd)))
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* This function handles relaxing for the H8..
|
||
|
||
There are a few relaxing opportunities available on the H8:
|
||
|
||
jmp/jsr:24 -> bra/bsr:8 2 bytes
|
||
The jmp may be completely eliminated if the previous insn is a
|
||
conditional branch to the insn after the jump. In that case
|
||
we invert the branch and delete the jump and save 4 bytes.
|
||
|
||
bCC:16 -> bCC:8 2 bytes
|
||
bsr:16 -> bsr:8 2 bytes
|
||
|
||
bset:16 -> bset:8 2 bytes
|
||
bset:24/32 -> bset:8 4 bytes
|
||
(also applicable to other bit manipulation instructions)
|
||
|
||
mov.b:16 -> mov.b:8 2 bytes
|
||
mov.b:24/32 -> mov.b:8 4 bytes
|
||
|
||
bset:24/32 -> bset:16 2 bytes
|
||
(also applicable to other bit manipulation instructions)
|
||
|
||
mov.[bwl]:24/32 -> mov.[bwl]:16 2 bytes
|
||
|
||
mov.[bwl] @(displ:24/32+ERx) -> mov.[bwl] @(displ:16+ERx) 4 bytes. */
|
||
|
||
static bool
|
||
elf32_h8_relax_section (bfd *abfd, asection *sec,
|
||
struct bfd_link_info *link_info, bool *again)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
Elf_Internal_Rela *internal_relocs;
|
||
Elf_Internal_Rela *irel, *irelend;
|
||
bfd_byte *contents = NULL;
|
||
Elf_Internal_Sym *isymbuf = NULL;
|
||
static asection *last_input_section = NULL;
|
||
static Elf_Internal_Rela *last_reloc = NULL;
|
||
|
||
/* Assume nothing changes. */
|
||
*again = false;
|
||
|
||
/* 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 (bfd_link_relocatable (link_info)
|
||
|| sec->reloc_count == 0
|
||
|| (sec->flags & SEC_RELOC) == 0
|
||
|| (sec->flags & SEC_HAS_CONTENTS) == 0
|
||
|| (sec->flags & SEC_CODE) == 0)
|
||
return true;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
|
||
/* Get a copy of the native relocations. */
|
||
internal_relocs = (_bfd_elf_link_read_relocs
|
||
(abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
|
||
link_info->keep_memory));
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
|
||
if (sec != last_input_section)
|
||
last_reloc = NULL;
|
||
|
||
last_input_section = sec;
|
||
|
||
/* Walk through the relocs looking for relaxing opportunities. */
|
||
irelend = internal_relocs + sec->reloc_count;
|
||
for (irel = internal_relocs; irel < irelend; irel++)
|
||
{
|
||
bfd_vma symval;
|
||
|
||
{
|
||
arelent bfd_reloc;
|
||
|
||
if (! elf32_h8_info_to_howto (abfd, &bfd_reloc, irel))
|
||
continue;
|
||
}
|
||
/* Keep track of the previous reloc so that we can delete
|
||
some long jumps created by the compiler. */
|
||
if (irel != internal_relocs)
|
||
last_reloc = irel - 1;
|
||
|
||
switch(ELF32_R_TYPE (irel->r_info))
|
||
{
|
||
case R_H8_DIR24R8:
|
||
case R_H8_PCREL16:
|
||
case R_H8_DIR16A8:
|
||
case R_H8_DIR24A8:
|
||
case R_H8_DIR32A16:
|
||
case R_H8_DISP32A16:
|
||
break;
|
||
default:
|
||
continue;
|
||
}
|
||
|
||
/* Get the section contents if we haven't done so already. */
|
||
if (contents == NULL)
|
||
{
|
||
/* Get cached copy if it exists. */
|
||
if (elf_section_data (sec)->this_hdr.contents != NULL)
|
||
contents = elf_section_data (sec)->this_hdr.contents;
|
||
else
|
||
{
|
||
/* Go get them off disk. */
|
||
if (!bfd_malloc_and_get_section (abfd, sec, &contents))
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* Read this BFD's local symbols if we haven't done so already. */
|
||
if (isymbuf == NULL && symtab_hdr->sh_info != 0)
|
||
{
|
||
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
if (isymbuf == NULL)
|
||
isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
|
||
symtab_hdr->sh_info, 0,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
/* 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. */
|
||
Elf_Internal_Sym *isym;
|
||
asection *sym_sec;
|
||
|
||
isym = isymbuf + ELF32_R_SYM (irel->r_info);
|
||
sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
|
||
symval = isym->st_value;
|
||
/* If the reloc is absolute, it will not have
|
||
a symbol or section associated with it. */
|
||
if (sym_sec)
|
||
symval += sym_sec->output_section->vma
|
||
+ sym_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);
|
||
}
|
||
|
||
/* For simplicity of coding, we are going to modify the section
|
||
contents, the section relocs, and the BFD symbol table. We
|
||
must tell the rest of the code not to free up this
|
||
information. It would be possible to instead create a table
|
||
of changes which have to be made, as is done in coff-mips.c;
|
||
that would be more work, but would require less memory when
|
||
the linker is run. */
|
||
switch (ELF32_R_TYPE (irel->r_info))
|
||
{
|
||
/* Try to turn a 24-bit absolute branch/call into an 8-bit
|
||
pc-relative branch/call. */
|
||
case R_H8_DIR24R8:
|
||
{
|
||
bfd_vma value = symval + irel->r_addend;
|
||
bfd_vma dot, gap;
|
||
|
||
/* Get the address of this instruction. */
|
||
dot = (sec->output_section->vma
|
||
+ sec->output_offset + irel->r_offset - 1);
|
||
|
||
/* Compute the distance from this insn to the branch target. */
|
||
gap = value - dot;
|
||
|
||
/* If the distance is within -126..+130 inclusive, then we can
|
||
relax this jump. +130 is valid since the target will move
|
||
two bytes closer if we do relax this branch. */
|
||
if ((int) gap >= -126 && (int) gap <= 130)
|
||
{
|
||
unsigned char code;
|
||
|
||
/* Note that we've changed the relocs, section contents,
|
||
etc. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
|
||
/* Get the instruction code being relaxed. */
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
|
||
|
||
/* If the previous instruction conditionally jumped around
|
||
this instruction, we may be able to reverse the condition
|
||
and redirect the previous instruction to the target of
|
||
this instruction.
|
||
|
||
Such sequences are used by the compiler to deal with
|
||
long conditional branches.
|
||
|
||
Only perform this optimisation for jumps (code 0x5a) not
|
||
subroutine calls, as otherwise it could transform:
|
||
|
||
mov.w r0,r0
|
||
beq .L1
|
||
jsr @_bar
|
||
.L1: rts
|
||
_bar: rts
|
||
into:
|
||
mov.w r0,r0
|
||
bne _bar
|
||
rts
|
||
_bar: rts
|
||
|
||
which changes the call (jsr) into a branch (bne). */
|
||
if (code == 0x5a /* jmp24. */
|
||
&& (int) gap <= 130
|
||
&& (int) gap >= -128
|
||
&& last_reloc
|
||
&& ELF32_R_TYPE (last_reloc->r_info) == R_H8_PCREL8
|
||
&& ELF32_R_SYM (last_reloc->r_info) < symtab_hdr->sh_info)
|
||
{
|
||
bfd_vma last_value;
|
||
asection *last_sym_sec;
|
||
Elf_Internal_Sym *last_sym;
|
||
|
||
/* We will need to examine the symbol used by the
|
||
previous relocation. */
|
||
|
||
last_sym = isymbuf + ELF32_R_SYM (last_reloc->r_info);
|
||
last_sym_sec
|
||
= bfd_section_from_elf_index (abfd, last_sym->st_shndx);
|
||
last_value = (last_sym->st_value
|
||
+ last_sym_sec->output_section->vma
|
||
+ last_sym_sec->output_offset);
|
||
|
||
/* Verify that the previous relocation was for a
|
||
branch around this instruction and that no symbol
|
||
exists at the current location. */
|
||
if (last_value == dot + 4
|
||
&& last_reloc->r_offset + 2 == irel->r_offset
|
||
&& ! elf32_h8_symbol_address_p (abfd, sec, dot))
|
||
{
|
||
/* We can eliminate this jump. Twiddle the
|
||
previous relocation as necessary. */
|
||
irel->r_info
|
||
= ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
ELF32_R_TYPE (R_H8_NONE));
|
||
|
||
last_reloc->r_info
|
||
= ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
ELF32_R_TYPE (R_H8_PCREL8));
|
||
last_reloc->r_addend = irel->r_addend;
|
||
|
||
code = bfd_get_8 (abfd,
|
||
contents + last_reloc->r_offset - 1);
|
||
code ^= 1;
|
||
bfd_put_8 (abfd,
|
||
code,
|
||
contents + last_reloc->r_offset - 1);
|
||
|
||
/* Delete four bytes of data. */
|
||
if (!elf32_h8_relax_delete_bytes (abfd, sec,
|
||
irel->r_offset - 1,
|
||
4))
|
||
goto error_return;
|
||
|
||
*again = true;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (code == 0x5e)
|
||
/* This is jsr24 */
|
||
bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1); /* bsr8. */
|
||
else if (code == 0x5a)
|
||
/* This is jmp24 */
|
||
bfd_put_8 (abfd, 0x40, contents + irel->r_offset - 1); /* bra8. */
|
||
else
|
||
abort ();
|
||
|
||
/* Fix the relocation's type. */
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_H8_PCREL8);
|
||
|
||
/* Delete two bytes of data. */
|
||
if (!elf32_h8_relax_delete_bytes (abfd, sec,
|
||
irel->r_offset + 1, 2))
|
||
goto error_return;
|
||
|
||
/* That will change things, so, we should relax again.
|
||
Note that this is not required, and it may be slow. */
|
||
*again = true;
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* Try to turn a 16-bit pc-relative branch into a 8-bit pc-relative
|
||
branch. */
|
||
case R_H8_PCREL16:
|
||
{
|
||
bfd_vma value = symval + irel->r_addend;
|
||
bfd_vma dot;
|
||
bfd_vma gap;
|
||
|
||
/* Get the address of this instruction. */
|
||
dot = (sec->output_section->vma
|
||
+ sec->output_offset
|
||
+ irel->r_offset - 2);
|
||
|
||
gap = value - dot;
|
||
|
||
/* If the distance is within -126..+130 inclusive, then we can
|
||
relax this jump. +130 is valid since the target will move
|
||
two bytes closer if we do relax this branch. */
|
||
if ((int) gap >= -126 && (int) gap <= 130)
|
||
{
|
||
unsigned char code;
|
||
|
||
/* Note that we've changed the relocs, section contents,
|
||
etc. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
|
||
/* Get the opcode. */
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
|
||
|
||
if (code == 0x58)
|
||
{
|
||
/* bCC:16 -> bCC:8 */
|
||
/* Get the second byte of the original insn, which
|
||
contains the condition code. */
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
|
||
|
||
/* Compute the first byte of the relaxed
|
||
instruction. The original sequence 0x58 0xX0
|
||
is relaxed to 0x4X, where X represents the
|
||
condition code. */
|
||
code &= 0xf0;
|
||
code >>= 4;
|
||
code |= 0x40;
|
||
bfd_put_8 (abfd, code, contents + irel->r_offset - 2); /* bCC:8. */
|
||
}
|
||
else if (code == 0x5c) /* bsr16. */
|
||
/* This is bsr. */
|
||
bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 2); /* bsr8. */
|
||
else
|
||
/* Might be MOVSD. */
|
||
break;
|
||
|
||
/* Fix the relocation's type. */
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_H8_PCREL8);
|
||
irel->r_offset--;
|
||
|
||
/* Delete two bytes of data. */
|
||
if (!elf32_h8_relax_delete_bytes (abfd, sec,
|
||
irel->r_offset + 1, 2))
|
||
goto error_return;
|
||
|
||
/* That will change things, so, we should relax again.
|
||
Note that this is not required, and it may be slow. */
|
||
*again = true;
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* This is a 16-bit absolute address in one of the following
|
||
instructions:
|
||
|
||
"band", "bclr", "biand", "bild", "bior", "bist", "bixor",
|
||
"bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
|
||
"mov.b"
|
||
|
||
We may relax this into an 8-bit absolute address if it's in
|
||
the right range. */
|
||
case R_H8_DIR16A8:
|
||
{
|
||
bfd_vma value;
|
||
|
||
value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
|
||
if (value >= 0xffffff00u)
|
||
{
|
||
unsigned char code;
|
||
unsigned char temp_code;
|
||
|
||
/* Note that we've changed the relocs, section contents,
|
||
etc. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
|
||
/* Get the opcode. */
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
|
||
|
||
/* All instructions with R_H8_DIR16A8 start with
|
||
0x6a. */
|
||
if (code != 0x6a)
|
||
abort ();
|
||
|
||
temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
|
||
/* If this is a mov.b instruction, clear the lower
|
||
nibble, which contains the source/destination
|
||
register number. */
|
||
if ((temp_code & 0x10) != 0x10)
|
||
temp_code &= 0xf0;
|
||
|
||
switch (temp_code)
|
||
{
|
||
case 0x00:
|
||
/* This is mov.b @aa:16,Rd. */
|
||
bfd_put_8 (abfd, (code & 0xf) | 0x20,
|
||
contents + irel->r_offset - 2);
|
||
break;
|
||
case 0x80:
|
||
/* This is mov.b Rs,@aa:16. */
|
||
bfd_put_8 (abfd, (code & 0xf) | 0x30,
|
||
contents + irel->r_offset - 2);
|
||
break;
|
||
case 0x18:
|
||
/* This is a bit-maniputation instruction that
|
||
stores one bit into memory, one of "bclr",
|
||
"bist", "bnot", "bset", and "bst". */
|
||
bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
|
||
break;
|
||
case 0x10:
|
||
/* This is a bit-maniputation instruction that
|
||
loads one bit from memory, one of "band",
|
||
"biand", "bild", "bior", "bixor", "bld", "bor",
|
||
"btst", and "bxor". */
|
||
bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
/* Fix the relocation's type. */
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_H8_DIR8);
|
||
|
||
/* Move the relocation. */
|
||
irel->r_offset--;
|
||
|
||
/* Delete two bytes of data. */
|
||
if (!elf32_h8_relax_delete_bytes (abfd, sec,
|
||
irel->r_offset + 1, 2))
|
||
goto error_return;
|
||
|
||
/* That will change things, so, we should relax again.
|
||
Note that this is not required, and it may be slow. */
|
||
*again = true;
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* This is a 24-bit absolute address in one of the following
|
||
instructions:
|
||
|
||
"band", "bclr", "biand", "bild", "bior", "bist", "bixor",
|
||
"bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
|
||
"mov.b"
|
||
|
||
We may relax this into an 8-bit absolute address if it's in
|
||
the right range. */
|
||
case R_H8_DIR24A8:
|
||
{
|
||
bfd_vma value;
|
||
|
||
value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
|
||
if (value >= 0xffffff00u)
|
||
{
|
||
unsigned char code;
|
||
unsigned char temp_code;
|
||
|
||
/* Note that we've changed the relocs, section contents,
|
||
etc. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
|
||
/* Get the opcode. */
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
|
||
|
||
/* All instructions with R_H8_DIR24A8 start with
|
||
0x6a. */
|
||
if (code != 0x6a)
|
||
abort ();
|
||
|
||
temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
|
||
|
||
/* If this is a mov.b instruction, clear the lower
|
||
nibble, which contains the source/destination
|
||
register number. */
|
||
if ((temp_code & 0x30) != 0x30)
|
||
temp_code &= 0xf0;
|
||
|
||
switch (temp_code)
|
||
{
|
||
case 0x20:
|
||
/* This is mov.b @aa:24/32,Rd. */
|
||
bfd_put_8 (abfd, (code & 0xf) | 0x20,
|
||
contents + irel->r_offset - 2);
|
||
break;
|
||
case 0xa0:
|
||
/* This is mov.b Rs,@aa:24/32. */
|
||
bfd_put_8 (abfd, (code & 0xf) | 0x30,
|
||
contents + irel->r_offset - 2);
|
||
break;
|
||
case 0x38:
|
||
/* This is a bit-maniputation instruction that
|
||
stores one bit into memory, one of "bclr",
|
||
"bist", "bnot", "bset", and "bst". */
|
||
bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
|
||
break;
|
||
case 0x30:
|
||
/* This is a bit-maniputation instruction that
|
||
loads one bit from memory, one of "band",
|
||
"biand", "bild", "bior", "bixor", "bld", "bor",
|
||
"btst", and "bxor". */
|
||
bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
|
||
break;
|
||
default:
|
||
abort();
|
||
}
|
||
|
||
/* Fix the relocation's type. */
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_H8_DIR8);
|
||
irel->r_offset--;
|
||
|
||
/* Delete four bytes of data. */
|
||
if (!elf32_h8_relax_delete_bytes (abfd, sec,
|
||
irel->r_offset + 1, 4))
|
||
goto error_return;
|
||
|
||
/* That will change things, so, we should relax again.
|
||
Note that this is not required, and it may be slow. */
|
||
*again = true;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Fall through. */
|
||
|
||
/* This is a 24-/32-bit absolute address in one of the
|
||
following instructions:
|
||
|
||
"band", "bclr", "biand", "bild", "bior", "bist",
|
||
"bixor", "bld", "bnot", "bor", "bset", "bst", "btst",
|
||
"bxor", "ldc.w", "stc.w" and "mov.[bwl]"
|
||
|
||
We may relax this into an 16-bit absolute address if it's
|
||
in the right range. */
|
||
case R_H8_DIR32A16:
|
||
{
|
||
bfd_vma value;
|
||
|
||
value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
|
||
if (value <= 0x7fff || value >= 0xffff8000u)
|
||
{
|
||
unsigned char code;
|
||
unsigned char op0, op1, op2, op3;
|
||
unsigned char *op_ptr;
|
||
|
||
/* Note that we've changed the relocs, section contents,
|
||
etc. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
|
||
if (irel->r_offset >= 4)
|
||
{
|
||
/* Check for 4-byte MOVA relaxation (SH-specific). */
|
||
int second_reloc = 0;
|
||
|
||
op_ptr = contents + irel->r_offset - 4;
|
||
|
||
if (last_reloc)
|
||
{
|
||
arelent bfd_reloc;
|
||
reloc_howto_type *h;
|
||
bfd_vma last_reloc_size;
|
||
|
||
if (! elf32_h8_info_to_howto (abfd, &bfd_reloc, last_reloc))
|
||
break;
|
||
h = bfd_reloc.howto;
|
||
last_reloc_size = 1 << h->size;
|
||
if (last_reloc->r_offset + last_reloc_size
|
||
== irel->r_offset)
|
||
{
|
||
op_ptr -= last_reloc_size;
|
||
second_reloc = 1;
|
||
}
|
||
}
|
||
|
||
if (irel + 1 < irelend)
|
||
{
|
||
Elf_Internal_Rela *next_reloc = irel + 1;
|
||
arelent bfd_reloc;
|
||
reloc_howto_type *h;
|
||
bfd_vma next_reloc_size;
|
||
|
||
if (! elf32_h8_info_to_howto (abfd, &bfd_reloc, next_reloc))
|
||
break;
|
||
h = bfd_reloc.howto;
|
||
next_reloc_size = 1 << h->size;
|
||
if (next_reloc->r_offset + next_reloc_size
|
||
== irel->r_offset)
|
||
{
|
||
op_ptr -= next_reloc_size;
|
||
second_reloc = 1;
|
||
}
|
||
}
|
||
|
||
op0 = bfd_get_8 (abfd, op_ptr + 0);
|
||
op1 = bfd_get_8 (abfd, op_ptr + 1);
|
||
op2 = bfd_get_8 (abfd, op_ptr + 2);
|
||
op3 = bfd_get_8 (abfd, op_ptr + 3);
|
||
|
||
if (op0 == 0x01
|
||
&& (op1 & 0xdf) == 0x5f
|
||
&& (op2 & 0x40) == 0x40
|
||
&& (op3 & 0x80) == 0x80)
|
||
{
|
||
if ((op2 & 0x08) == 0)
|
||
second_reloc = 1;
|
||
|
||
if (second_reloc)
|
||
{
|
||
op3 &= ~0x08;
|
||
bfd_put_8 (abfd, op3, op_ptr + 3);
|
||
}
|
||
else
|
||
{
|
||
op2 &= ~0x08;
|
||
bfd_put_8 (abfd, op2, op_ptr + 2);
|
||
}
|
||
goto r_h8_dir32a16_common;
|
||
}
|
||
}
|
||
|
||
/* Now check for short version of MOVA. (SH-specific) */
|
||
op_ptr = contents + irel->r_offset - 2;
|
||
op0 = bfd_get_8 (abfd, op_ptr + 0);
|
||
op1 = bfd_get_8 (abfd, op_ptr + 1);
|
||
|
||
if (op0 == 0x7a
|
||
&& (op1 & 0x88) == 0x80)
|
||
{
|
||
op1 |= 0x08;
|
||
bfd_put_8 (abfd, op1, op_ptr + 1);
|
||
goto r_h8_dir32a16_common;
|
||
}
|
||
|
||
/* Get the opcode. */
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
|
||
|
||
/* Fix the opcode. For all the instructions that
|
||
belong to this relaxation, we simply need to turn
|
||
off bit 0x20 in the previous byte. */
|
||
code &= ~0x20;
|
||
|
||
bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
|
||
|
||
r_h8_dir32a16_common:
|
||
/* Fix the relocation's type. */
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_H8_DIR16);
|
||
|
||
/* Delete two bytes of data. */
|
||
if (!elf32_h8_relax_delete_bytes (abfd, sec,
|
||
irel->r_offset + 1, 2))
|
||
goto error_return;
|
||
|
||
/* That will change things, so, we should relax again.
|
||
Note that this is not required, and it may be slow. */
|
||
*again = true;
|
||
}
|
||
break; /* case R_H8_DIR32A16 */
|
||
}
|
||
|
||
case R_H8_DISP32A16:
|
||
/* mov.[bwl] @(displ:24/32+ERx) -> mov.[bwl] @(displ:16+ERx) 4 bytes
|
||
It is assured that instruction uses at least 4 bytes opcode before
|
||
reloc entry addressing mode "register indirect with displacement"
|
||
relaxing options (all saving 4 bytes):
|
||
0x78 0sss0000 0x6A 0010dddd disp:32 mov.b @(d:32,ERs),Rd ->
|
||
0x6E 0sssdddd disp:16 mov.b @(d:16,ERs),Rd
|
||
0x78 0sss0000 0x6B 0010dddd disp:32 mov.w @(d:32,ERs),Rd ->
|
||
0x6F 0sssdddd disp:16 mov.w @(d:16,ERs),Rd
|
||
0x01 0x00 0x78 0sss0000 0x6B 00100ddd disp:32 mov.l @(d:32,ERs),ERd ->
|
||
0x01 0x00 0x6F 0sss0ddd disp:16 mov.l @(d:16,ERs),ERd
|
||
|
||
0x78 0ddd0000 0x6A 1010ssss disp:32 mov.b Rs,@(d:32,ERd) ->
|
||
0x6E 1dddssss disp:16 mov.b Rs,@(d:16,ERd)
|
||
0x78 0ddd0000 0x6B 1010ssss disp:32 mov.w Rs,@(d:32,ERd) ->
|
||
0x6F 1dddssss disp:16 mov.w Rs,@(d:16,ERd)
|
||
0x01 0x00 0x78 xddd0000 0x6B 10100sss disp:32 mov.l ERs,@(d:32,ERd) ->
|
||
0x01 0x00 0x6F 1ddd0sss disp:16 mov.l ERs,@(d:16,ERd)
|
||
mov.l prefix 0x01 0x00 can be left as is and mov.l handled same
|
||
as mov.w/ */
|
||
{
|
||
bfd_vma value;
|
||
|
||
value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
|
||
if (value <= 0x7fff || value >= 0xffff8000u)
|
||
{
|
||
unsigned char op0, op1, op2, op3, op0n, op1n;
|
||
int relax = 0;
|
||
|
||
/* Note that we've changed the relocs, section contents,
|
||
etc. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
|
||
if (irel->r_offset >= 4)
|
||
{
|
||
op0 = bfd_get_8 (abfd, contents + irel->r_offset - 4);
|
||
op1 = bfd_get_8 (abfd, contents + irel->r_offset - 3);
|
||
op2 = bfd_get_8 (abfd, contents + irel->r_offset - 2);
|
||
op3 = bfd_get_8 (abfd, contents + irel->r_offset - 1);
|
||
|
||
if (op0 == 0x78)
|
||
{
|
||
switch(op2)
|
||
{
|
||
case 0x6A:
|
||
if ((op1 & 0x8F) == 0x00 && (op3 & 0x70) == 0x20)
|
||
{
|
||
/* mov.b. */
|
||
op0n = 0x6E;
|
||
relax = 1;
|
||
}
|
||
break;
|
||
case 0x6B:
|
||
if ((op1 & 0x0F) == 0x00 && (op3 & 0x70) == 0x20)
|
||
{
|
||
/* mov.w/l. */
|
||
op0n = 0x6F;
|
||
relax = 1;
|
||
}
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (relax)
|
||
{
|
||
op1n = (op3 & 0x8F) | (op1 & 0x70);
|
||
bfd_put_8 (abfd, op0n, contents + irel->r_offset - 4);
|
||
bfd_put_8 (abfd, op1n, contents + irel->r_offset - 3);
|
||
|
||
/* Fix the relocation's type. */
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_H8_DIR16);
|
||
irel->r_offset -= 2;
|
||
|
||
/* Delete four bytes of data. */
|
||
if (!elf32_h8_relax_delete_bytes (abfd, sec, irel->r_offset + 2, 4))
|
||
goto error_return;
|
||
|
||
/* That will change things, so, we should relax again.
|
||
Note that this is not required, and it may be slow. */
|
||
*again = true;
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (isymbuf != NULL
|
||
&& symtab_hdr->contents != (unsigned char *) isymbuf)
|
||
{
|
||
if (! link_info->keep_memory)
|
||
free (isymbuf);
|
||
else
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
}
|
||
|
||
if (contents != NULL
|
||
&& elf_section_data (sec)->this_hdr.contents != contents)
|
||
{
|
||
if (! link_info->keep_memory)
|
||
free (contents);
|
||
else
|
||
{
|
||
/* Cache the section contents for elf_link_input_bfd. */
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
}
|
||
}
|
||
|
||
if (elf_section_data (sec)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
|
||
return true;
|
||
|
||
error_return:
|
||
if (symtab_hdr->contents != (unsigned char *) isymbuf)
|
||
free (isymbuf);
|
||
if (elf_section_data (sec)->this_hdr.contents != contents)
|
||
free (contents);
|
||
if (elf_section_data (sec)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
return false;
|
||
}
|
||
|
||
/* Delete some bytes from a section while relaxing. */
|
||
|
||
static bool
|
||
elf32_h8_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
unsigned int sec_shndx;
|
||
bfd_byte *contents;
|
||
Elf_Internal_Rela *irel, *irelend;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
bfd_vma toaddr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
struct elf_link_hash_entry **end_hashes;
|
||
unsigned int symcount;
|
||
|
||
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
|
||
|
||
contents = elf_section_data (sec)->this_hdr.contents;
|
||
|
||
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;
|
||
}
|
||
|
||
/* Adjust the local symbols defined in this section. */
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
isym = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
isymend = isym + symtab_hdr->sh_info;
|
||
for (; isym < isymend; isym++)
|
||
{
|
||
if (isym->st_shndx == sec_shndx
|
||
&& isym->st_value > addr
|
||
&& isym->st_value <= toaddr)
|
||
isym->st_value -= count;
|
||
}
|
||
|
||
/* 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);
|
||
end_hashes = sym_hashes + symcount;
|
||
for (; sym_hashes < end_hashes; sym_hashes++)
|
||
{
|
||
struct elf_link_hash_entry *sym_hash = *sym_hashes;
|
||
|
||
if ((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;
|
||
}
|
||
|
||
/* Return TRUE if a symbol exists at the given address, else return
|
||
FALSE. */
|
||
static bool
|
||
elf32_h8_symbol_address_p (bfd *abfd, asection *sec, bfd_vma addr)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
unsigned int sec_shndx;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
struct elf_link_hash_entry **end_hashes;
|
||
unsigned int symcount;
|
||
|
||
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
|
||
|
||
/* Examine all the symbols. */
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
isym = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
isymend = isym + symtab_hdr->sh_info;
|
||
for (; isym < isymend; isym++)
|
||
{
|
||
if (isym->st_shndx == sec_shndx
|
||
&& isym->st_value == addr)
|
||
return true;
|
||
}
|
||
|
||
symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
|
||
- symtab_hdr->sh_info);
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
end_hashes = sym_hashes + symcount;
|
||
for (; sym_hashes < end_hashes; sym_hashes++)
|
||
{
|
||
struct elf_link_hash_entry *sym_hash = *sym_hashes;
|
||
if ((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)
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* This is a version of bfd_generic_get_relocated_section_contents
|
||
which uses elf32_h8_relocate_section. */
|
||
|
||
static bfd_byte *
|
||
elf32_h8_get_relocated_section_contents (bfd *output_bfd,
|
||
struct bfd_link_info *link_info,
|
||
struct bfd_link_order *link_order,
|
||
bfd_byte *data,
|
||
bool relocatable,
|
||
asymbol **symbols)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
asection *input_section = link_order->u.indirect.section;
|
||
bfd *input_bfd = input_section->owner;
|
||
asection **sections = NULL;
|
||
Elf_Internal_Rela *internal_relocs = NULL;
|
||
Elf_Internal_Sym *isymbuf = NULL;
|
||
|
||
/* We only need to handle the case of relaxing, or of having a
|
||
particular set of section contents, specially. */
|
||
if (relocatable
|
||
|| elf_section_data (input_section)->this_hdr.contents == NULL)
|
||
return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
|
||
link_order, data,
|
||
relocatable,
|
||
symbols);
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
|
||
bfd_byte *orig_data = data;
|
||
if (data == NULL)
|
||
{
|
||
data = bfd_malloc (input_section->size);
|
||
if (data == NULL)
|
||
return NULL;
|
||
}
|
||
memcpy (data, elf_section_data (input_section)->this_hdr.contents,
|
||
(size_t) input_section->size);
|
||
|
||
if ((input_section->flags & SEC_RELOC) != 0
|
||
&& input_section->reloc_count > 0)
|
||
{
|
||
asection **secpp;
|
||
Elf_Internal_Sym *isym, *isymend;
|
||
bfd_size_type amt;
|
||
|
||
internal_relocs = (_bfd_elf_link_read_relocs
|
||
(input_bfd, input_section, NULL,
|
||
(Elf_Internal_Rela *) NULL, false));
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
|
||
if (symtab_hdr->sh_info != 0)
|
||
{
|
||
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
if (isymbuf == NULL)
|
||
isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
|
||
symtab_hdr->sh_info, 0,
|
||
NULL, NULL, NULL);
|
||
if (isymbuf == NULL)
|
||
goto error_return;
|
||
}
|
||
|
||
amt = symtab_hdr->sh_info;
|
||
amt *= sizeof (asection *);
|
||
sections = (asection **) bfd_malloc (amt);
|
||
if (sections == NULL && amt != 0)
|
||
goto error_return;
|
||
|
||
isymend = isymbuf + symtab_hdr->sh_info;
|
||
for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
|
||
{
|
||
asection *isec;
|
||
|
||
if (isym->st_shndx == SHN_UNDEF)
|
||
isec = bfd_und_section_ptr;
|
||
else if (isym->st_shndx == SHN_ABS)
|
||
isec = bfd_abs_section_ptr;
|
||
else if (isym->st_shndx == SHN_COMMON)
|
||
isec = bfd_com_section_ptr;
|
||
else
|
||
isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
|
||
|
||
*secpp = isec;
|
||
}
|
||
|
||
if (! elf32_h8_relocate_section (output_bfd, link_info, input_bfd,
|
||
input_section, data, internal_relocs,
|
||
isymbuf, sections))
|
||
goto error_return;
|
||
|
||
free (sections);
|
||
if (symtab_hdr->contents != (unsigned char *) isymbuf)
|
||
free (isymbuf);
|
||
if (elf_section_data (input_section)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
}
|
||
|
||
return data;
|
||
|
||
error_return:
|
||
free (sections);
|
||
if (symtab_hdr->contents != (unsigned char *) isymbuf)
|
||
free (isymbuf);
|
||
if (elf_section_data (input_section)->relocs != internal_relocs)
|
||
free (internal_relocs);
|
||
if (orig_data == NULL)
|
||
free (data);
|
||
return NULL;
|
||
}
|
||
|
||
|
||
#define TARGET_BIG_SYM h8300_elf32_vec
|
||
#define TARGET_BIG_NAME "elf32-h8300"
|
||
#define ELF_ARCH bfd_arch_h8300
|
||
#define ELF_MACHINE_CODE EM_H8_300
|
||
#define ELF_MAXPAGESIZE 0x1
|
||
#define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup
|
||
#define bfd_elf32_bfd_reloc_name_lookup elf32_h8_reloc_name_lookup
|
||
#define elf_info_to_howto elf32_h8_info_to_howto
|
||
#define elf_info_to_howto_rel elf32_h8_info_to_howto_rel
|
||
|
||
/* So we can set/examine bits in e_flags to get the specific
|
||
H8 architecture in use. */
|
||
#define elf_backend_final_write_processing \
|
||
elf32_h8_final_write_processing
|
||
#define elf_backend_object_p \
|
||
elf32_h8_object_p
|
||
#define bfd_elf32_bfd_merge_private_bfd_data \
|
||
elf32_h8_merge_private_bfd_data
|
||
|
||
/* ??? when elf_backend_relocate_section is not defined, elf32-target.h
|
||
defaults to using _bfd_generic_link_hash_table_create, but
|
||
bfd_elf_size_dynamic_sections uses
|
||
dynobj = elf_hash_table (info)->dynobj;
|
||
and thus requires an elf hash table. */
|
||
#define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create
|
||
|
||
/* Use an H8 specific linker, not the ELF generic linker. */
|
||
#define elf_backend_relocate_section elf32_h8_relocate_section
|
||
#define elf_backend_rela_normal 1
|
||
#define elf_backend_can_gc_sections 1
|
||
|
||
/* And relaxing stuff. */
|
||
#define bfd_elf32_bfd_relax_section elf32_h8_relax_section
|
||
#define bfd_elf32_bfd_get_relocated_section_contents \
|
||
elf32_h8_get_relocated_section_contents
|
||
|
||
#define elf_symbol_leading_char '_'
|
||
|
||
#include "elf32-target.h"
|
||
|
||
#undef TARGET_BIG_SYM
|
||
#define TARGET_BIG_SYM h8300_elf32_linux_vec
|
||
#undef TARGET_BIG_NAME
|
||
#define TARGET_BIG_NAME "elf32-h8300-linux"
|
||
#undef elf_symbol_leading_char
|
||
#define elf32_bed elf32_h8300_linux_bed
|
||
|
||
#include "elf32-target.h"
|