1260 lines
36 KiB
C
1260 lines
36 KiB
C
/* ft32-specific support for 32-bit ELF.
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Copyright (C) 2013-2022 Free Software Foundation, Inc.
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Copied from elf32-moxie.c which is..
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Copyright (C) 2009-2022 Free Software Foundation, Inc.
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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 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/ft32.h"
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#include "opcode/ft32.h"
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static bool debug_relax = false;
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static bfd_reloc_status_type
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bfd_elf_ft32_diff_reloc (bfd *, arelent *, asymbol *, void *,
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asection *, bfd *, char **);
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static reloc_howto_type ft32_elf_howto_table [] =
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{
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/* This reloc does nothing. */
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HOWTO (R_FT32_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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bfd_elf_generic_reloc, /* special_function */
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"R_FT32_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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/* A 32 bit absolute relocation. */
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HOWTO (R_FT32_32, /* 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_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_FT32_32", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_16, /* 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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bfd_elf_generic_reloc, /* special_function */
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"R_FT32_16", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_8, /* 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_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_FT32_8", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x000000ff, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_10, /* type */
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0, /* rightshift */
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2, /* size */
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10, /* bitsize */
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false, /* pc_relative */
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4, /* 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_FT32_10", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x00003ff0, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_20, /* type */
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0, /* rightshift */
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4, /* size */
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20, /* 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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bfd_elf_generic_reloc, /* special_function */
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"R_FT32_20", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x000fffff, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_17, /* type */
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0, /* rightshift */
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4, /* size */
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17, /* 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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bfd_elf_generic_reloc, /* special_function */
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"R_FT32_17", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x0001ffff, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_18, /* type */
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2, /* rightshift */
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4, /* size */
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18, /* 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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bfd_elf_generic_reloc, /* special_function */
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"R_FT32_18", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x0003ffff, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_RELAX, /* type */
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0, /* rightshift */
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2, /* size */
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10, /* bitsize */
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false, /* pc_relative */
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4, /* 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_FT32_RELAX", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x00000000, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_SC0, /* type */
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0, /* rightshift */
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2, /* size */
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10, /* bitsize */
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false, /* pc_relative */
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4, /* 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_FT32_SC0", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x00000000, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_SC1, /* type */
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2, /* rightshift */
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4, /* size */
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22, /* bitsize */
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true, /* pc_relative */
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7, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_FT32_SC1", /* name */
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true, /* partial_inplace */
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0x07ffff80, /* src_mask */
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0x07ffff80, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_15, /* type */
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0, /* rightshift */
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4, /* size */
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15, /* 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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bfd_elf_generic_reloc, /* special_function */
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"R_FT32_15", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x00007fff, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_FT32_DIFF32, /* 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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bfd_elf_ft32_diff_reloc, /* special_function */
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"R_FT32_DIFF32", /* 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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};
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/* Map BFD reloc types to FT32 ELF reloc types. */
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struct ft32_reloc_map
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{
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bfd_reloc_code_real_type bfd_reloc_val;
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unsigned int ft32_reloc_val;
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};
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static const struct ft32_reloc_map ft32_reloc_map [] =
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{
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{ BFD_RELOC_NONE, R_FT32_NONE },
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{ BFD_RELOC_32, R_FT32_32 },
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{ BFD_RELOC_16, R_FT32_16 },
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{ BFD_RELOC_8, R_FT32_8 },
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{ BFD_RELOC_FT32_10, R_FT32_10 },
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{ BFD_RELOC_FT32_20, R_FT32_20 },
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{ BFD_RELOC_FT32_17, R_FT32_17 },
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{ BFD_RELOC_FT32_18, R_FT32_18 },
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{ BFD_RELOC_FT32_RELAX, R_FT32_RELAX },
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{ BFD_RELOC_FT32_SC0, R_FT32_SC0 },
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{ BFD_RELOC_FT32_SC1, R_FT32_SC1 },
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{ BFD_RELOC_FT32_15, R_FT32_15 },
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{ BFD_RELOC_FT32_DIFF32, R_FT32_DIFF32 },
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};
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/* Perform a diff relocation. Nothing to do, as the difference value is
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already written into the section's contents. */
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static bfd_reloc_status_type
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bfd_elf_ft32_diff_reloc (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 ATTRIBUTE_UNUSED,
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char **error_message ATTRIBUTE_UNUSED)
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{
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return bfd_reloc_ok;
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}
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static reloc_howto_type *
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ft32_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 (ft32_reloc_map) / sizeof (ft32_reloc_map[0]); i++)
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if (ft32_reloc_map [i].bfd_reloc_val == code)
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return & ft32_elf_howto_table [ft32_reloc_map[i].ft32_reloc_val];
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return NULL;
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}
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static reloc_howto_type *
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ft32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 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 (ft32_elf_howto_table) / sizeof (ft32_elf_howto_table[0]);
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i++)
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if (ft32_elf_howto_table[i].name != NULL
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&& strcasecmp (ft32_elf_howto_table[i].name, r_name) == 0)
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return &ft32_elf_howto_table[i];
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return NULL;
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}
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/* Set the howto pointer for an FT32 ELF reloc. */
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static bool
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ft32_info_to_howto_rela (bfd *abfd,
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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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if (r_type >= (unsigned int) R_FT32_max)
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{
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/* xgettext:c-format */
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_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
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abfd, r_type);
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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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cache_ptr->howto = & ft32_elf_howto_table [r_type];
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return cache_ptr->howto != NULL;
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}
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/* Relocate an FT32 ELF section.
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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 int
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ft32_elf_relocate_section (bfd *output_bfd,
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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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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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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;
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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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howto = ft32_elf_howto_table + r_type;
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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 = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
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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 (sec) : name;
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}
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else
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{
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bool unresolved_reloc, warned, ignored;
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RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
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r_symndx, symtab_hdr, sym_hashes,
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h, sec, relocation,
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unresolved_reloc, warned, ignored);
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||
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name = h->root.root.string;
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}
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if (sec != NULL && discarded_section (sec))
|
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RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
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rel, 1, relend, howto, 0, contents);
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|
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if (bfd_link_relocatable (info))
|
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continue;
|
||
|
||
switch (howto->type)
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{
|
||
case R_FT32_SC0:
|
||
{
|
||
unsigned int insn;
|
||
int offset;
|
||
unsigned int code15[2];
|
||
|
||
insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
|
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ft32_split_shortcode (insn, code15);
|
||
|
||
offset = (int)relocation;
|
||
offset += (int)(rel->r_addend - rel->r_offset);
|
||
offset -= (input_section->output_section->vma +
|
||
input_section->output_offset);
|
||
if ((offset < -1024) || (offset >= 1024))
|
||
{
|
||
r = bfd_reloc_outofrange;
|
||
break;
|
||
}
|
||
code15[0] |= ((offset / 4) & 511);
|
||
insn = ft32_merge_shortcode (code15);
|
||
bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
|
||
}
|
||
r = bfd_reloc_ok;
|
||
break;
|
||
|
||
case R_FT32_SC1:
|
||
{
|
||
unsigned int insn;
|
||
int offset;
|
||
unsigned int code15[2];
|
||
|
||
insn = bfd_get_32 (input_bfd, contents + rel->r_offset);
|
||
ft32_split_shortcode (insn, code15);
|
||
|
||
offset = (int)relocation;
|
||
offset += (int)(rel->r_addend - rel->r_offset);
|
||
offset -= (input_section->output_section->vma +
|
||
input_section->output_offset);
|
||
if ((offset < -1024) || (offset >= 1024))
|
||
{
|
||
r = bfd_reloc_outofrange;
|
||
break;
|
||
}
|
||
code15[1] |= ((offset / 4) & 511);
|
||
insn = ft32_merge_shortcode (code15);
|
||
bfd_put_32 (input_bfd, insn, contents + rel->r_offset);
|
||
}
|
||
r = bfd_reloc_ok;
|
||
break;
|
||
|
||
case R_FT32_DIFF32:
|
||
r = bfd_reloc_ok;
|
||
break;
|
||
|
||
default:
|
||
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
|
||
contents, rel->r_offset,
|
||
relocation, rel->r_addend);
|
||
break;
|
||
}
|
||
|
||
if (r != bfd_reloc_ok)
|
||
{
|
||
const char * msg = NULL;
|
||
|
||
switch (r)
|
||
{
|
||
case bfd_reloc_overflow:
|
||
(*info->callbacks->reloc_overflow)
|
||
(info, (h ? &h->root : NULL), name, howto->name,
|
||
(bfd_vma) 0, input_bfd, input_section, rel->r_offset);
|
||
break;
|
||
|
||
case bfd_reloc_undefined:
|
||
(*info->callbacks->undefined_symbol)
|
||
(info, name, input_bfd, input_section, rel->r_offset, true);
|
||
break;
|
||
|
||
case bfd_reloc_outofrange:
|
||
msg = _("internal error: out of range error");
|
||
break;
|
||
|
||
case bfd_reloc_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)
|
||
(*info->callbacks->warning) (info, msg, name, input_bfd,
|
||
input_section, rel->r_offset);
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Relaxation. */
|
||
|
||
static bool
|
||
ft32_reloc_shortable
|
||
(bfd * abfd,
|
||
asection * sec,
|
||
Elf_Internal_Sym * isymbuf ATTRIBUTE_UNUSED,
|
||
bfd_byte * contents,
|
||
bfd_vma pc ATTRIBUTE_UNUSED,
|
||
Elf_Internal_Rela * irel,
|
||
unsigned int * sc)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr ATTRIBUTE_UNUSED;
|
||
bfd_vma symval;
|
||
|
||
enum elf_ft32_reloc_type r_type;
|
||
reloc_howto_type *howto = NULL;
|
||
unsigned int insn;
|
||
int offset;
|
||
bfd_vma dot, value;
|
||
|
||
r_type = ELF32_R_TYPE (irel->r_info);
|
||
howto = &ft32_elf_howto_table [r_type];
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
|
||
/* 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. */
|
||
return false;
|
||
|
||
symval = (h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset);
|
||
}
|
||
|
||
switch (r_type)
|
||
{
|
||
case R_FT32_8:
|
||
case R_FT32_10:
|
||
case R_FT32_16:
|
||
case R_FT32_20:
|
||
case R_FT32_RELAX:
|
||
if (symval != 0)
|
||
return false;
|
||
insn = bfd_get_32 (abfd, contents + irel->r_offset);
|
||
insn |= ((symval + irel->r_addend) << howto->bitpos) & howto->dst_mask;
|
||
return ft32_shortcode (insn, sc);
|
||
|
||
case R_FT32_18:
|
||
insn = bfd_get_32 (abfd, contents + irel->r_offset);
|
||
/* Get the address of this instruction. */
|
||
dot = (sec->output_section->vma
|
||
+ sec->output_offset + irel->r_offset);
|
||
value = symval + irel->r_addend;
|
||
offset = (value - dot) / 4;
|
||
|
||
if ((dot > 0x8c) && (-256 <= offset) && (offset < 256))
|
||
{
|
||
switch (insn)
|
||
{
|
||
case 0x00200000: *sc = (3 << 13) | (0 << 9); return true;
|
||
case 0x00280000: *sc = (3 << 13) | (1 << 9); return true;
|
||
case 0x00600000: *sc = (3 << 13) | (2 << 9); return true;
|
||
case 0x00680000: *sc = (3 << 13) | (3 << 9); return true;
|
||
case 0x00a00000: *sc = (3 << 13) | (4 << 9); return true;
|
||
case 0x00a80000: *sc = (3 << 13) | (5 << 9); return true;
|
||
case 0x00e00000: *sc = (3 << 13) | (6 << 9); return true;
|
||
case 0x00e80000: *sc = (3 << 13) | (7 << 9); return true;
|
||
case 0x01200000: *sc = (3 << 13) | (8 << 9); return true;
|
||
case 0x01280000: *sc = (3 << 13) | (9 << 9); return true;
|
||
case 0x01600000: *sc = (3 << 13) | (10 << 9); return true;
|
||
case 0x01680000: *sc = (3 << 13) | (11 << 9); return true;
|
||
case 0x01a00000: *sc = (3 << 13) | (12 << 9); return true;
|
||
case 0x01a80000: *sc = (3 << 13) | (13 << 9); return true;
|
||
|
||
case 0x00300000: *sc = (3 << 13) | (14 << 9); return true;
|
||
case 0x00340000: *sc = (3 << 13) | (15 << 9); return true;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
break;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/* Returns whether the relocation type passed is a diff reloc. */
|
||
|
||
static bool
|
||
elf32_ft32_is_diff_reloc (Elf_Internal_Rela *irel)
|
||
{
|
||
return (ELF32_R_TYPE (irel->r_info) == R_FT32_DIFF32);
|
||
}
|
||
|
||
/* Reduce the diff value written in the section by count if the shrinked
|
||
insn address happens to fall between the two symbols for which this
|
||
diff reloc was emitted. */
|
||
|
||
static bool
|
||
elf32_ft32_adjust_diff_reloc_value (bfd *abfd,
|
||
struct bfd_section *isec,
|
||
Elf_Internal_Rela *irel,
|
||
bfd_vma symval,
|
||
bfd_vma shrinked_insn_address,
|
||
int count)
|
||
{
|
||
unsigned char * reloc_contents = NULL;
|
||
unsigned char * isec_contents = elf_section_data (isec)->this_hdr.contents;
|
||
bfd_signed_vma x = 0;
|
||
bfd_vma sym2_address;
|
||
bfd_vma sym1_address;
|
||
bfd_vma start_address;
|
||
bfd_vma end_address;
|
||
|
||
|
||
if (isec_contents == NULL)
|
||
{
|
||
if (! bfd_malloc_and_get_section (abfd, isec, &isec_contents))
|
||
return false;
|
||
|
||
elf_section_data (isec)->this_hdr.contents = isec_contents;
|
||
}
|
||
|
||
reloc_contents = isec_contents + irel->r_offset;
|
||
|
||
/* Read value written in object file. */
|
||
switch (ELF32_R_TYPE (irel->r_info))
|
||
{
|
||
case R_FT32_DIFF32:
|
||
x = bfd_get_signed_32 (abfd, reloc_contents);
|
||
break;
|
||
|
||
default:
|
||
return false;
|
||
}
|
||
|
||
/* For a diff reloc sym1 - sym2 the diff at assembly time (x) is written
|
||
into the object file at the reloc offset. sym2's logical value is
|
||
symval (<start_of_section>) + reloc addend. Compute the start and end
|
||
addresses and check if the shrinked insn falls between sym1 and sym2. */
|
||
sym2_address = symval + irel->r_addend;
|
||
sym1_address = sym2_address - x;
|
||
|
||
/* Don't assume sym2 is bigger than sym1 - the difference
|
||
could be negative. Compute start and end addresses, and
|
||
use those to see if they span shrinked_insn_address. */
|
||
start_address = sym1_address < sym2_address ? sym1_address : sym2_address;
|
||
end_address = sym1_address > sym2_address ? sym1_address : sym2_address;
|
||
|
||
if (shrinked_insn_address >= start_address
|
||
&& shrinked_insn_address < end_address)
|
||
{
|
||
/* Reduce the diff value by count bytes and write it back into section
|
||
contents. */
|
||
bfd_signed_vma new_diff = x < 0 ? x + count : x - count;
|
||
|
||
if (sym2_address > shrinked_insn_address)
|
||
irel->r_addend -= count;
|
||
|
||
switch (ELF32_R_TYPE (irel->r_info))
|
||
{
|
||
case R_FT32_DIFF32:
|
||
bfd_put_signed_32 (abfd, new_diff & 0xFFFFFFFF, reloc_contents);
|
||
break;
|
||
|
||
default:
|
||
return false;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
static bool
|
||
elf32_ft32_adjust_reloc_if_spans_insn (bfd *abfd,
|
||
asection *isec,
|
||
Elf_Internal_Rela *irel, bfd_vma symval,
|
||
bfd_vma shrinked_insn_address,
|
||
bfd_vma shrink_boundary,
|
||
int count)
|
||
{
|
||
|
||
if (elf32_ft32_is_diff_reloc (irel))
|
||
{
|
||
if (!elf32_ft32_adjust_diff_reloc_value (abfd, isec, irel,
|
||
symval,
|
||
shrinked_insn_address,
|
||
count))
|
||
return false;
|
||
}
|
||
else
|
||
{
|
||
bfd_vma reloc_value = symval + irel->r_addend;
|
||
bool addend_within_shrink_boundary =
|
||
(reloc_value <= shrink_boundary);
|
||
bool reloc_spans_insn =
|
||
(symval <= shrinked_insn_address
|
||
&& reloc_value > shrinked_insn_address
|
||
&& addend_within_shrink_boundary);
|
||
|
||
if (! reloc_spans_insn)
|
||
return true;
|
||
|
||
irel->r_addend -= count;
|
||
|
||
if (debug_relax)
|
||
printf ("Relocation's addend needed to be fixed \n");
|
||
}
|
||
return true;
|
||
}
|
||
|
||
/* Delete some bytes from a section while relaxing. */
|
||
|
||
static bool
|
||
elf32_ft32_relax_delete_bytes (struct bfd_link_info *link_info, 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;
|
||
bfd_vma toaddr;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymend;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
struct elf_link_hash_entry **end_hashes;
|
||
struct elf_link_hash_entry **start_hashes;
|
||
unsigned int symcount;
|
||
Elf_Internal_Sym *isymbuf = NULL;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
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;
|
||
|
||
/* The reloc's own addresses are now ok. However, we need to readjust
|
||
the reloc's addend, i.e. the reloc's value if two conditions are met:
|
||
1.) the reloc is relative to a symbol in this section that
|
||
is located in front of the shrinked instruction
|
||
2.) symbol plus addend end up behind the shrinked instruction.
|
||
|
||
The most common case where this happens are relocs relative to
|
||
the section-start symbol.
|
||
|
||
This step needs to be done for all of the sections of the bfd. */
|
||
{
|
||
struct bfd_section *isec;
|
||
|
||
for (isec = abfd->sections; isec; isec = isec->next)
|
||
{
|
||
bfd_vma symval;
|
||
bfd_vma shrinked_insn_address;
|
||
|
||
if (isec->reloc_count == 0)
|
||
continue;
|
||
|
||
shrinked_insn_address = (sec->output_section->vma
|
||
+ sec->output_offset + addr - count);
|
||
|
||
irel = elf_section_data (isec)->relocs;
|
||
/* PR 12161: Read in the relocs for this section if necessary. */
|
||
if (irel == NULL)
|
||
irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, true);
|
||
|
||
for (irelend = irel + isec->reloc_count; irel < irelend; irel++)
|
||
{
|
||
/* 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)
|
||
return false;
|
||
}
|
||
|
||
/* 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. */
|
||
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 == sec)
|
||
{
|
||
symval += sym_sec->output_section->vma
|
||
+ sym_sec->output_offset;
|
||
|
||
if (debug_relax)
|
||
printf ("Checking if the relocation's "
|
||
"addend needs corrections.\n"
|
||
"Address of anchor symbol: 0x%x \n"
|
||
"Address of relocation target: 0x%x \n"
|
||
"Address of relaxed insn: 0x%x \n",
|
||
(unsigned int) symval,
|
||
(unsigned int) (symval + irel->r_addend),
|
||
(unsigned int) shrinked_insn_address);
|
||
|
||
if (symval <= shrinked_insn_address
|
||
&& (symval + irel->r_addend) > shrinked_insn_address)
|
||
{
|
||
/* If there is an alignment boundary, we only need to
|
||
adjust addends that end up below the boundary. */
|
||
bfd_vma shrink_boundary = (toaddr
|
||
+ sec->output_section->vma
|
||
+ sec->output_offset);
|
||
|
||
if (debug_relax)
|
||
printf
|
||
("Relocation's addend needed to be fixed \n");
|
||
|
||
if (!elf32_ft32_adjust_reloc_if_spans_insn (abfd, isec,
|
||
irel, symval,
|
||
shrinked_insn_address,
|
||
shrink_boundary,
|
||
count))
|
||
return false;
|
||
}
|
||
}
|
||
/* else reference symbol is absolute. No adjustment needed. */
|
||
}
|
||
/* else...Reference symbol is extern. No need for adjusting
|
||
the addend. */
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Adjust the local symbols defined in this section. */
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
isym = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
if (isym)
|
||
{
|
||
for (isymend = isym + symtab_hdr->sh_info; 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 = start_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;
|
||
|
||
/* The '--wrap SYMBOL' option is causing a pain when the object file,
|
||
containing the definition of __wrap_SYMBOL, includes a direct
|
||
call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
|
||
the same symbol (which is __wrap_SYMBOL), but still exist as two
|
||
different symbols in 'sym_hashes', we don't want to adjust
|
||
the global symbol __wrap_SYMBOL twice.
|
||
This check is only relevant when symbols are being wrapped. */
|
||
if (link_info->wrap_hash != NULL)
|
||
{
|
||
struct elf_link_hash_entry **cur_sym_hashes;
|
||
|
||
/* Loop only over the symbols whom been already checked. */
|
||
for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
|
||
cur_sym_hashes++)
|
||
/* If the current symbol is identical to 'sym_hash', that means
|
||
the symbol was already adjusted (or at least checked). */
|
||
if (*cur_sym_hashes == sym_hash)
|
||
break;
|
||
|
||
/* Don't adjust the symbol again. */
|
||
if (cur_sym_hashes < sym_hashes)
|
||
continue;
|
||
}
|
||
|
||
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 LOC can be a target of a branch, jump or call. */
|
||
|
||
static bool
|
||
elf32_ft32_relax_is_branch_target (struct bfd_link_info *link_info,
|
||
bfd * abfd, asection * sec,
|
||
bfd_vma loc)
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
Elf_Internal_Rela *irel, *irelend;
|
||
Elf_Internal_Sym *isym;
|
||
Elf_Internal_Sym *isymbuf = NULL;
|
||
bfd_vma symval;
|
||
struct bfd_section *isec;
|
||
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
struct elf_link_hash_entry **end_hashes;
|
||
struct elf_link_hash_entry **start_hashes;
|
||
unsigned int symcount;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
|
||
/* Now we check for relocations pointing to ret. */
|
||
for (isec = abfd->sections; isec; isec = isec->next)
|
||
{
|
||
irel = elf_section_data (isec)->relocs;
|
||
if (irel == NULL)
|
||
irel = _bfd_elf_link_read_relocs (abfd, isec, NULL, NULL, true);
|
||
|
||
irelend = irel + isec->reloc_count;
|
||
|
||
for (; irel < irelend; irel++)
|
||
{
|
||
/* 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)
|
||
return false;
|
||
}
|
||
|
||
/* 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. */
|
||
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 == sec)
|
||
{
|
||
symval += sym_sec->output_section->vma
|
||
+ sym_sec->output_offset;
|
||
|
||
if (debug_relax)
|
||
printf ("0x%x: Address of anchor symbol: 0x%x "
|
||
"Address of relocation target: 0x%x \n",
|
||
(unsigned int) irel->r_offset,
|
||
(unsigned int) symval,
|
||
(unsigned int) (symval + irel->r_addend));
|
||
if ((irel->r_addend) == loc)
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
|
||
- symtab_hdr->sh_info);
|
||
sym_hashes = start_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;
|
||
|
||
/* The '--wrap SYMBOL' option is causing a pain when the object file,
|
||
containing the definition of __wrap_SYMBOL, includes a direct
|
||
call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
|
||
the same symbol (which is __wrap_SYMBOL), but still exist as two
|
||
different symbols in 'sym_hashes', we don't want to adjust
|
||
the global symbol __wrap_SYMBOL twice.
|
||
This check is only relevant when symbols are being wrapped. */
|
||
if (link_info->wrap_hash != NULL)
|
||
{
|
||
struct elf_link_hash_entry **cur_sym_hashes;
|
||
|
||
/* Loop only over the symbols whom been already checked. */
|
||
for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
|
||
cur_sym_hashes++)
|
||
/* If the current symbol is identical to 'sym_hash', that means
|
||
the symbol was already adjusted (or at least checked). */
|
||
if (*cur_sym_hashes == sym_hash)
|
||
break;
|
||
|
||
/* Don't adjust the symbol again. */
|
||
if (cur_sym_hashes < sym_hashes)
|
||
continue;
|
||
}
|
||
|
||
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 == loc)
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
static bool
|
||
ft32_elf_relax_section (bfd *abfd,
|
||
asection *sec,
|
||
struct bfd_link_info *link_info,
|
||
bool *again)
|
||
{
|
||
Elf_Internal_Rela * free_relocs = NULL;
|
||
Elf_Internal_Rela * internal_relocs;
|
||
Elf_Internal_Rela * irelend;
|
||
Elf_Internal_Rela * irel;
|
||
bfd_byte * contents = NULL;
|
||
Elf_Internal_Shdr * symtab_hdr;
|
||
Elf_Internal_Sym * isymbuf = 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->flags & SEC_RELOC) == 0
|
||
|| sec->reloc_count == 0
|
||
|| (sec->flags & SEC_CODE) == 0)
|
||
return true;
|
||
|
||
/* Get the section contents. */
|
||
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;
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
}
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
|
||
/* 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;
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
}
|
||
|
||
internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, 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;
|
||
|
||
/* Test every adjacent pair of relocs. If both have shortcodes,
|
||
fuse them and delete the relocs. */
|
||
irel = internal_relocs;
|
||
while (irel < irelend - 1)
|
||
{
|
||
Elf_Internal_Rela * irel_next = irel + 1;
|
||
unsigned int sc0, sc1;
|
||
bfd_vma pc;
|
||
|
||
pc = irel->r_offset;
|
||
|
||
if (((pc + 4) == (irel_next->r_offset))
|
||
&& ft32_reloc_shortable (abfd, sec, isymbuf, contents, pc, irel,
|
||
&sc0)
|
||
&& ft32_reloc_shortable (abfd, sec, isymbuf, contents, pc,
|
||
irel_next, &sc1)
|
||
&& !elf32_ft32_relax_is_branch_target (link_info, abfd, sec,
|
||
irel_next->r_offset))
|
||
{
|
||
unsigned int code30 = (sc1 << 15) | sc0;
|
||
unsigned int code27 = code30 >> 3;
|
||
unsigned int code3 = code30 & 7;
|
||
static const unsigned char pat3[] = {2, 3, 4, 5, 6, 9, 10, 14};
|
||
unsigned int pattern = pat3[code3];
|
||
unsigned int fused = (pattern << 27) | code27;
|
||
|
||
/* Move second reloc to same place as first. */
|
||
irel_next->r_offset = irel->r_offset;
|
||
|
||
/* Change both relocs to R_FT32_NONE. */
|
||
|
||
if (ELF32_R_TYPE (irel->r_info) == R_FT32_18)
|
||
{
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_FT32_SC0);
|
||
}
|
||
else
|
||
{
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_FT32_NONE);
|
||
}
|
||
|
||
if (ELF32_R_TYPE (irel_next->r_info) == R_FT32_18)
|
||
{
|
||
irel_next->r_info = ELF32_R_INFO (ELF32_R_SYM (irel_next->r_info),
|
||
R_FT32_SC1);
|
||
}
|
||
else
|
||
{
|
||
irel_next->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_FT32_NONE);
|
||
}
|
||
|
||
/* Replace the first insn with the fused version. */
|
||
bfd_put_32 (abfd, fused, contents + irel->r_offset);
|
||
|
||
/* Delete the second insn. */
|
||
if (!elf32_ft32_relax_delete_bytes (link_info, abfd, sec,
|
||
irel->r_offset + 4, 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;
|
||
|
||
irel += 2;
|
||
}
|
||
else
|
||
{
|
||
irel += 1;
|
||
}
|
||
}
|
||
|
||
if (isymbuf != NULL
|
||
&& symtab_hdr->contents != (unsigned char *) isymbuf)
|
||
{
|
||
if (! link_info->keep_memory)
|
||
free (isymbuf);
|
||
else
|
||
/* Cache the symbols for elf_link_input_bfd. */
|
||
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:
|
||
free (free_relocs);
|
||
|
||
return true;
|
||
}
|
||
|
||
#define ELF_ARCH bfd_arch_ft32
|
||
#define ELF_MACHINE_CODE EM_FT32
|
||
#define ELF_MAXPAGESIZE 0x1
|
||
|
||
#define TARGET_LITTLE_SYM ft32_elf32_vec
|
||
#define TARGET_LITTLE_NAME "elf32-ft32"
|
||
|
||
#define elf_info_to_howto_rel NULL
|
||
#define elf_info_to_howto ft32_info_to_howto_rela
|
||
#define elf_backend_relocate_section ft32_elf_relocate_section
|
||
|
||
#define elf_backend_can_gc_sections 1
|
||
#define elf_backend_rela_normal 1
|
||
|
||
#define bfd_elf32_bfd_reloc_type_lookup ft32_reloc_type_lookup
|
||
#define bfd_elf32_bfd_reloc_name_lookup ft32_reloc_name_lookup
|
||
|
||
#define bfd_elf32_bfd_relax_section ft32_elf_relax_section
|
||
|
||
#include "elf32-target.h"
|