670 lines
20 KiB
C
670 lines
20 KiB
C
/* Motorola MCore specific support for 32-bit ELF
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Copyright (C) 1994-2022 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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/* This file is based on a preliminary RCE ELF ABI. The
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information may not match the final RCE ELF ABI. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "bfdlink.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/mcore.h"
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#include <assert.h>
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/* RELA relocs are used here... */
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/* Function to set whether a module needs the -mrelocatable bit set. */
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static bool
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mcore_elf_set_private_flags (bfd * abfd, flagword flags)
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{
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BFD_ASSERT (! elf_flags_init (abfd)
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|| elf_elfheader (abfd)->e_flags == flags);
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elf_elfheader (abfd)->e_flags = flags;
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elf_flags_init (abfd) = true;
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return true;
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}
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/* Merge backend specific data from an object file to the output
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object file when linking. */
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static bool
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mcore_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
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{
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bfd *obfd = info->output_bfd;
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flagword old_flags;
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flagword new_flags;
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/* Check if we have the same endianness. */
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if (! _bfd_generic_verify_endian_match (ibfd, info))
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return false;
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if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour
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|| bfd_get_flavour (obfd) != bfd_target_elf_flavour)
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return true;
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new_flags = elf_elfheader (ibfd)->e_flags;
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old_flags = elf_elfheader (obfd)->e_flags;
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if (! elf_flags_init (obfd))
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{
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/* First call, no flags set. */
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elf_flags_init (obfd) = true;
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elf_elfheader (obfd)->e_flags = new_flags;
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}
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else if (new_flags == old_flags)
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/* Compatible flags are OK. */
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;
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else
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{
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/* FIXME */
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}
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return true;
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}
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/* Don't pretend we can deal with unsupported relocs. */
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static bfd_reloc_status_type
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mcore_elf_unsupported_reloc (bfd * abfd,
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arelent * reloc_entry,
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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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BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
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/* xgettext:c-format */
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_bfd_error_handler (_("%pB: %s unsupported"),
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abfd,
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reloc_entry->howto->name);
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return bfd_reloc_notsupported;
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}
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static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max];
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static reloc_howto_type mcore_elf_howto_raw[] =
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{
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/* This reloc does nothing. */
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HOWTO (R_MCORE_NONE, /* type */
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0, /* rightshift */
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3, /* size (0 = byte, 1 = short, 2 = long) */
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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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NULL, /* special_function */
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"R_MCORE_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 standard 32 bit relocation. */
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HOWTO (R_MCORE_ADDR32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"ADDR32", /* name *//* For compatibility with coff/pe port. */
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false, /* partial_inplace */
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0x0, /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
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Should not appear in object files. */
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HOWTO (R_MCORE_PCRELIMM8BY4, /* type */
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2, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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8, /* bitsize */
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true, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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mcore_elf_unsupported_reloc, /* special_function */
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"R_MCORE_PCRELIMM8BY4",/* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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true), /* pcrel_offset */
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/* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
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Span 2k instructions == 4k bytes.
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Only useful pieces at the relocated address are the opcode (5 bits) */
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HOWTO (R_MCORE_PCRELIMM11BY2,/* type */
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1, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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11, /* bitsize */
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true, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MCORE_PCRELIMM11BY2",/* name */
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false, /* partial_inplace */
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0x0, /* src_mask */
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0x7ff, /* dst_mask */
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true), /* pcrel_offset */
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/* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */
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HOWTO (R_MCORE_PCRELIMM4BY2, /* type */
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1, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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4, /* bitsize */
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true, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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mcore_elf_unsupported_reloc,/* special_function */
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"R_MCORE_PCRELIMM4BY2",/* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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true), /* pcrel_offset */
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/* 32-bit pc-relative. Eventually this will help support PIC code. */
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HOWTO (R_MCORE_PCREL32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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true, /* 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_MCORE_PCREL32", /* name */
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false, /* partial_inplace */
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0x0, /* src_mask */
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0xffffffff, /* dst_mask */
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true), /* pcrel_offset */
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/* Like PCRELIMM11BY2, this relocation indicates that there is a
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'jsri' at the specified address. There is a separate relocation
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entry for the literal pool entry that it references, but we
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might be able to change the jsri to a bsr if the target turns out
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to be close enough [even though we won't reclaim the literal pool
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entry, we'll get some runtime efficiency back]. Note that this
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is a relocation that we are allowed to safely ignore. */
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HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */
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1, /* rightshift */
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1, /* size (0 = byte, 1 = short, 2 = long) */
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11, /* bitsize */
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true, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MCORE_PCRELJSR_IMM11BY2", /* name */
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false, /* partial_inplace */
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0x0, /* src_mask */
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0x7ff, /* dst_mask */
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true), /* pcrel_offset */
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/* GNU extension to record C++ vtable hierarchy. */
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HOWTO (R_MCORE_GNU_VTINHERIT, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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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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NULL, /* special_function */
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"R_MCORE_GNU_VTINHERIT", /* 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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/* GNU extension to record C++ vtable member usage. */
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HOWTO (R_MCORE_GNU_VTENTRY, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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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_rel_vtable_reloc_fn, /* special_function */
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"R_MCORE_GNU_VTENTRY", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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false), /* pcrel_offset */
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HOWTO (R_MCORE_RELATIVE, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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NULL, /* special_function */
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"R_MCORE_RELATIVE", /* name */
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true, /* partial_inplace */
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0xffffffff, /* src_mask */
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0xffffffff, /* dst_mask */
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false) /* pcrel_offset */
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};
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#ifndef NUM_ELEM
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#define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
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#endif
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/* Initialize the mcore_elf_howto_table, so that linear accesses can be done. */
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static void
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mcore_elf_howto_init (void)
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{
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unsigned int i;
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for (i = NUM_ELEM (mcore_elf_howto_raw); i--;)
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{
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unsigned int type;
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type = mcore_elf_howto_raw[i].type;
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BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table));
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mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i];
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}
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}
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static reloc_howto_type *
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mcore_elf_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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enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE;
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switch (code)
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{
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case BFD_RELOC_NONE: mcore_reloc = R_MCORE_NONE; break;
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case BFD_RELOC_32: mcore_reloc = R_MCORE_ADDR32; break;
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case BFD_RELOC_MCORE_PCREL_IMM8BY4: mcore_reloc = R_MCORE_PCRELIMM8BY4; break;
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case BFD_RELOC_MCORE_PCREL_IMM11BY2: mcore_reloc = R_MCORE_PCRELIMM11BY2; break;
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case BFD_RELOC_MCORE_PCREL_IMM4BY2: mcore_reloc = R_MCORE_PCRELIMM4BY2; break;
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case BFD_RELOC_32_PCREL: mcore_reloc = R_MCORE_PCREL32; break;
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case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break;
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case BFD_RELOC_VTABLE_INHERIT: mcore_reloc = R_MCORE_GNU_VTINHERIT; break;
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case BFD_RELOC_VTABLE_ENTRY: mcore_reloc = R_MCORE_GNU_VTENTRY; break;
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case BFD_RELOC_RVA: mcore_reloc = R_MCORE_RELATIVE; break;
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default:
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return NULL;
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}
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if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])
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/* Initialize howto table if needed. */
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mcore_elf_howto_init ();
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return mcore_elf_howto_table [(int) mcore_reloc];
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};
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static reloc_howto_type *
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mcore_elf_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 (mcore_elf_howto_raw) / sizeof (mcore_elf_howto_raw[0]);
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i++)
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if (mcore_elf_howto_raw[i].name != NULL
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&& strcasecmp (mcore_elf_howto_raw[i].name, r_name) == 0)
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return &mcore_elf_howto_raw[i];
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return NULL;
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}
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/* Set the howto pointer for a RCE ELF reloc. */
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static bool
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mcore_elf_info_to_howto (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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if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])
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/* Initialize howto table if needed. */
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mcore_elf_howto_init ();
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r_type = ELF32_R_TYPE (dst->r_info);
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if (r_type >= R_MCORE_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 = mcore_elf_howto_table [r_type];
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return true;
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}
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/* The RELOCATE_SECTION function is called by the 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 adjust the section contents as
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necessary, and (if using Rela relocs and generating a
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relocatable output file) adjusting the reloc addend as
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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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mcore_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 = & elf_tdata (input_bfd)->symtab_hdr;
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struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd);
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Elf_Internal_Rela * rel = relocs;
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Elf_Internal_Rela * relend = relocs + input_section->reloc_count;
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bool ret = true;
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#ifdef DEBUG
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_bfd_error_handler
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("mcore_elf_relocate_section called for %pB section %pA, %u relocations%s",
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input_bfd,
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input_section,
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input_section->reloc_count,
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(bfd_link_relocatable (info)) ? " (relocatable)" : "");
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#endif
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if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4]) /* Initialize howto table if needed */
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mcore_elf_howto_init ();
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for (; rel < relend; rel++)
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{
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enum elf_mcore_reloc_type r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info);
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bfd_vma offset = rel->r_offset;
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bfd_vma addend = rel->r_addend;
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bfd_reloc_status_type r = bfd_reloc_other;
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asection * sec = NULL;
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reloc_howto_type * howto;
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bfd_vma relocation;
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Elf_Internal_Sym * sym = NULL;
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unsigned long r_symndx;
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struct elf_link_hash_entry * h = NULL;
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unsigned short oldinst = 0;
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/* Unknown relocation handling. */
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if ((unsigned) r_type >= (unsigned) R_MCORE_max
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|| ! mcore_elf_howto_table [(int)r_type])
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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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input_bfd, (int) r_type);
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bfd_set_error (bfd_error_bad_value);
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ret = false;
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continue;
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}
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howto = mcore_elf_howto_table [(int) r_type];
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r_symndx = ELF32_R_SYM (rel->r_info);
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/* Complain about known relocation that are not yet supported. */
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if (howto->special_function == mcore_elf_unsupported_reloc)
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{
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/* xgettext:c-format */
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_bfd_error_handler (_("%pB: %s unsupported"),
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input_bfd,
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howto->name);
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bfd_set_error (bfd_error_bad_value);
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ret = false;
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continue;
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}
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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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addend = rel->r_addend;
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}
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else
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{
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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;
|
||
|
||
switch (r_type)
|
||
{
|
||
default:
|
||
break;
|
||
|
||
case R_MCORE_PCRELJSR_IMM11BY2:
|
||
oldinst = bfd_get_16 (input_bfd, contents + offset);
|
||
#define MCORE_INST_BSR 0xF800
|
||
bfd_put_16 (input_bfd, (bfd_vma) MCORE_INST_BSR, contents + offset);
|
||
break;
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
|
||
howto->name, r_type, r_symndx, (long) offset, (long) addend);
|
||
#endif
|
||
|
||
r = _bfd_final_link_relocate
|
||
(howto, input_bfd, input_section, contents, offset, relocation, addend);
|
||
|
||
if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
|
||
{
|
||
/* Wasn't ok, back it out and give up. */
|
||
bfd_put_16 (input_bfd, (bfd_vma) oldinst, contents + offset);
|
||
r = bfd_reloc_ok;
|
||
}
|
||
|
||
if (r != bfd_reloc_ok)
|
||
{
|
||
ret = false;
|
||
|
||
switch (r)
|
||
{
|
||
default:
|
||
break;
|
||
|
||
case bfd_reloc_overflow:
|
||
{
|
||
const char * name;
|
||
|
||
if (h != NULL)
|
||
name = NULL;
|
||
else
|
||
{
|
||
name = bfd_elf_string_from_elf_section
|
||
(input_bfd, symtab_hdr->sh_link, sym->st_name);
|
||
|
||
if (name == NULL)
|
||
break;
|
||
|
||
if (* name == '\0')
|
||
name = bfd_section_name (sec);
|
||
}
|
||
|
||
(*info->callbacks->reloc_overflow)
|
||
(info, (h ? &h->root : NULL), name, howto->name,
|
||
(bfd_vma) 0, input_bfd, input_section, offset);
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
#ifdef DEBUG
|
||
fprintf (stderr, "\n");
|
||
#endif
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Return the section that should be marked against GC for a given
|
||
relocation. */
|
||
|
||
static asection *
|
||
mcore_elf_gc_mark_hook (asection *sec,
|
||
struct bfd_link_info *info,
|
||
Elf_Internal_Rela *rel,
|
||
struct elf_link_hash_entry *h,
|
||
Elf_Internal_Sym *sym)
|
||
{
|
||
if (h != NULL)
|
||
switch (ELF32_R_TYPE (rel->r_info))
|
||
{
|
||
case R_MCORE_GNU_VTINHERIT:
|
||
case R_MCORE_GNU_VTENTRY:
|
||
return NULL;
|
||
}
|
||
|
||
return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
|
||
}
|
||
|
||
/* Look through the relocs for a section during the first phase.
|
||
Since we don't do .gots or .plts, we just need to consider the
|
||
virtual table relocs for gc. */
|
||
|
||
static bool
|
||
mcore_elf_check_relocs (bfd * abfd,
|
||
struct bfd_link_info * info,
|
||
asection * sec,
|
||
const Elf_Internal_Rela * relocs)
|
||
{
|
||
Elf_Internal_Shdr * symtab_hdr;
|
||
struct elf_link_hash_entry ** sym_hashes;
|
||
const Elf_Internal_Rela * rel;
|
||
const Elf_Internal_Rela * rel_end;
|
||
|
||
if (bfd_link_relocatable (info))
|
||
return true;
|
||
|
||
symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (abfd);
|
||
|
||
rel_end = relocs + sec->reloc_count;
|
||
|
||
for (rel = relocs; rel < rel_end; rel++)
|
||
{
|
||
struct elf_link_hash_entry * h;
|
||
unsigned long r_symndx;
|
||
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
h = NULL;
|
||
else
|
||
{
|
||
h = sym_hashes [r_symndx - symtab_hdr->sh_info];
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
}
|
||
|
||
switch (ELF32_R_TYPE (rel->r_info))
|
||
{
|
||
/* This relocation describes the C++ object vtable hierarchy.
|
||
Reconstruct it for later use during GC. */
|
||
case R_MCORE_GNU_VTINHERIT:
|
||
if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
|
||
return false;
|
||
break;
|
||
|
||
/* This relocation describes which C++ vtable entries are actually
|
||
used. Record for later use during GC. */
|
||
case R_MCORE_GNU_VTENTRY:
|
||
if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
|
||
return false;
|
||
break;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
static const struct bfd_elf_special_section mcore_elf_special_sections[]=
|
||
{
|
||
{ STRING_COMMA_LEN (".ctors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
|
||
{ STRING_COMMA_LEN (".dtors"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
|
||
{ NULL, 0, 0, 0, 0 }
|
||
};
|
||
|
||
#define TARGET_BIG_SYM mcore_elf32_be_vec
|
||
#define TARGET_BIG_NAME "elf32-mcore-big"
|
||
#define TARGET_LITTLE_SYM mcore_elf32_le_vec
|
||
#define TARGET_LITTLE_NAME "elf32-mcore-little"
|
||
|
||
#define ELF_ARCH bfd_arch_mcore
|
||
#define ELF_MACHINE_CODE EM_MCORE
|
||
#define ELF_MAXPAGESIZE 0x1000 /* 4k, if we ever have 'em */
|
||
#define elf_info_to_howto mcore_elf_info_to_howto
|
||
#define elf_info_to_howto_rel NULL
|
||
|
||
#define bfd_elf32_bfd_merge_private_bfd_data mcore_elf_merge_private_bfd_data
|
||
#define bfd_elf32_bfd_set_private_flags mcore_elf_set_private_flags
|
||
#define bfd_elf32_bfd_reloc_type_lookup mcore_elf_reloc_type_lookup
|
||
#define bfd_elf32_bfd_reloc_name_lookup mcore_elf_reloc_name_lookup
|
||
#define elf_backend_relocate_section mcore_elf_relocate_section
|
||
#define elf_backend_gc_mark_hook mcore_elf_gc_mark_hook
|
||
#define elf_backend_check_relocs mcore_elf_check_relocs
|
||
#define elf_backend_special_sections mcore_elf_special_sections
|
||
|
||
#define elf_backend_can_gc_sections 1
|
||
#define elf_backend_rela_normal 1
|
||
|
||
#include "elf32-target.h"
|