601 lines
17 KiB
C
601 lines
17 KiB
C
/* Morpho Technologies MT specific support for 32-bit ELF
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Copyright (C) 2001-2022 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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#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/mt.h"
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/* Prototypes. */
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static reloc_howto_type * mt_reloc_type_lookup
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(bfd *, bfd_reloc_code_real_type);
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static bool mt_info_to_howto_rela
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(bfd *, arelent *, Elf_Internal_Rela *);
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static bfd_reloc_status_type mt_elf_relocate_hi16
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(bfd *, Elf_Internal_Rela *, bfd_byte *, bfd_vma);
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static bfd_reloc_status_type mt_final_link_relocate
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(reloc_howto_type *, bfd *, asection *, bfd_byte *,
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Elf_Internal_Rela *, bfd_vma);
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static int mt_elf_relocate_section
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(bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
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Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
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/* Relocation tables. */
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static reloc_howto_type mt_elf_howto_table [] =
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{
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/* This reloc does nothing. */
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HOWTO (R_MT_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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bfd_elf_generic_reloc, /* special_function */
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"R_MT_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 16 bit absolute relocation. */
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HOWTO (R_MT_16, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MT_16", /* name */
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false, /* partial_inplace */
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0 , /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 32 bit absolute relocation. */
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HOWTO (R_MT_32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MT_32", /* name */
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false, /* partial_inplace */
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0 , /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 32 bit pc-relative relocation. */
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HOWTO (R_MT_32_PCREL, /* 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_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MT_32_PCREL", /* 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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true), /* pcrel_offset */
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/* A 16 bit pc-relative relocation. */
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HOWTO (R_MT_PC16, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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true, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MT_PC16", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xffff, /* dst_mask */
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true), /* pcrel_offset */
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/* high 16 bits of symbol value. */
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HOWTO (R_MT_HI16, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MT_HI16", /* name */
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false, /* partial_inplace */
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0xffff0000, /* src_mask */
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0xffff0000, /* dst_mask */
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false), /* pcrel_offset */
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/* Low 16 bits of symbol value. */
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HOWTO (R_MT_LO16, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MT_LO16", /* name */
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false, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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};
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/* Map BFD reloc types to MT ELF reloc types. */
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static reloc_howto_type *
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mt_reloc_type_lookup
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(bfd * abfd ATTRIBUTE_UNUSED,
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bfd_reloc_code_real_type code)
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{
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/* Note that the mt_elf_howto_table is indxed by the R_
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constants. Thus, the order that the howto records appear in the
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table *must* match the order of the relocation types defined in
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include/elf/mt.h. */
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switch (code)
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{
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case BFD_RELOC_NONE:
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return &mt_elf_howto_table[ (int) R_MT_NONE];
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case BFD_RELOC_16:
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return &mt_elf_howto_table[ (int) R_MT_16];
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case BFD_RELOC_32:
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return &mt_elf_howto_table[ (int) R_MT_32];
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case BFD_RELOC_32_PCREL:
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return &mt_elf_howto_table[ (int) R_MT_32_PCREL];
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case BFD_RELOC_16_PCREL:
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return &mt_elf_howto_table[ (int) R_MT_PC16];
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case BFD_RELOC_HI16:
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return &mt_elf_howto_table[ (int) R_MT_HI16];
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case BFD_RELOC_LO16:
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return &mt_elf_howto_table[ (int) R_MT_LO16];
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default:
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/* Pacify gcc -Wall. */
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return NULL;
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}
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return NULL;
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}
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static reloc_howto_type *
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mt_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 (mt_elf_howto_table) / sizeof (mt_elf_howto_table[0]);
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i++)
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if (mt_elf_howto_table[i].name != NULL
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&& strcasecmp (mt_elf_howto_table[i].name, r_name) == 0)
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return &mt_elf_howto_table[i];
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return NULL;
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}
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bfd_reloc_status_type
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mt_elf_relocate_hi16
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(bfd * input_bfd,
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Elf_Internal_Rela * relhi,
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bfd_byte * contents,
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bfd_vma value)
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{
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bfd_vma insn;
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insn = bfd_get_32 (input_bfd, contents + relhi->r_offset);
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value += relhi->r_addend;
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value >>= 16;
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insn = ((insn & ~0xFFFF) | value);
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bfd_put_32 (input_bfd, insn, contents + relhi->r_offset);
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return bfd_reloc_ok;
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}
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/* XXX: The following code is the result of a cut&paste. This unfortunate
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practice is very widespread in the various target back-end files. */
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/* Set the howto pointer for a MT ELF reloc. */
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static bool
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mt_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_MT_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 = & mt_elf_howto_table [r_type];
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return true;
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}
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/* Perform a single relocation. By default we use the standard BFD
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routines. */
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static bfd_reloc_status_type
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mt_final_link_relocate
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(reloc_howto_type * howto,
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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 * rel,
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bfd_vma relocation)
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{
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return _bfd_final_link_relocate (howto, input_bfd, input_section,
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contents, rel->r_offset,
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relocation, rel->r_addend);
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}
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/* Relocate a MT ELF section.
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There is some attempt to make this function usable for many architectures,
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both USE_REL and USE_RELA ['twould be nice if such a critter existed],
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if only to serve as a learning tool.
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The RELOCATE_SECTION function is called by the new ELF backend linker
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to handle the relocations for a section.
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The relocs are always passed as Rela structures; if the section
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actually uses Rel structures, the r_addend field will always be
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zero.
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This function is responsible for adjusting the section contents as
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necessary, and (if using Rela relocs and generating a relocatable
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output file) adjusting the reloc addend as necessary.
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This function does not have to worry about setting the reloc
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address or the reloc symbol index.
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LOCAL_SYMS is a pointer to the swapped in local symbols.
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LOCAL_SECTIONS is an array giving the section in the input file
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corresponding to the st_shndx field of each local symbol.
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The global hash table entry for the global symbols can be found
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via elf_sym_hashes (input_bfd).
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When generating relocatable output, this function must handle
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STB_LOCAL/STT_SECTION symbols specially. The output symbol is
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going to be the section symbol corresponding to the output
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section, which means that the addend must be adjusted
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accordingly. */
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static int
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mt_elf_relocate_section
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(bfd * output_bfd ATTRIBUTE_UNUSED,
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struct bfd_link_info * info,
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bfd * input_bfd,
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asection * input_section,
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bfd_byte * contents,
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Elf_Internal_Rela * relocs,
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Elf_Internal_Sym * local_syms,
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asection ** local_sections)
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{
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Elf_Internal_Shdr * symtab_hdr;
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struct elf_link_hash_entry ** sym_hashes;
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Elf_Internal_Rela * rel;
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Elf_Internal_Rela * relend;
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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 = NULL;
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int r_type;
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r_type = ELF32_R_TYPE (rel->r_info);
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r_symndx = ELF32_R_SYM (rel->r_info);
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howto = mt_elf_howto_table + ELF32_R_TYPE (rel->r_info);
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h = NULL;
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sym = NULL;
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sec = NULL;
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if (r_symndx < symtab_hdr->sh_info)
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{
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sym = local_syms + r_symndx;
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sec = local_sections [r_symndx];
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relocation = _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;
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bool 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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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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if (bfd_link_relocatable (info))
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continue;
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/* Finally, the sole MT-specific part. */
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switch (r_type)
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{
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case R_MT_HI16:
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r = mt_elf_relocate_hi16 (input_bfd, rel, contents, relocation);
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break;
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default:
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r = mt_final_link_relocate (howto, input_bfd, input_section,
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contents, rel, relocation);
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break;
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}
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if (r != bfd_reloc_ok)
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{
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const char * msg = (const char *) NULL;
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switch (r)
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{
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case bfd_reloc_overflow:
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(*info->callbacks->reloc_overflow)
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(info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0,
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input_bfd, input_section, rel->r_offset);
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break;
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case bfd_reloc_undefined:
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(*info->callbacks->undefined_symbol)
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(info, name, input_bfd, input_section, rel->r_offset, true);
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break;
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case bfd_reloc_outofrange:
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msg = _("internal error: out of range error");
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break;
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case bfd_reloc_dangerous:
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msg = _("internal error: dangerous relocation");
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break;
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default:
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msg = _("internal error: unknown error");
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break;
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}
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if (msg)
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(*info->callbacks->warning) (info, msg, name, input_bfd,
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input_section, rel->r_offset);
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}
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}
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return true;
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}
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/* Look through the relocs for a section during the first phase.
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Since we don't do .gots or .plts, we just need to consider the
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virtual table relocs for gc. */
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static bool
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mt_elf_check_relocs (bfd *abfd,
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struct bfd_link_info *info,
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asection *sec,
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const Elf_Internal_Rela *relocs)
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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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const Elf_Internal_Rela *rel;
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const Elf_Internal_Rela *rel_end;
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if (bfd_link_relocatable (info))
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return true;
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symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
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sym_hashes = elf_sym_hashes (abfd);
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rel_end = relocs + sec->reloc_count;
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for (rel = relocs; rel < rel_end; rel++)
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{
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struct elf_link_hash_entry *h;
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unsigned long r_symndx;
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r_symndx = ELF32_R_SYM (rel->r_info);
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if (r_symndx < symtab_hdr->sh_info)
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h = NULL;
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else
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{
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h = sym_hashes[r_symndx - symtab_hdr->sh_info];
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while (h->root.type == bfd_link_hash_indirect
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|| h->root.type == bfd_link_hash_warning)
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h = (struct elf_link_hash_entry *) h->root.u.i.link;
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}
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}
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return true;
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}
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/* Return the MACH for an e_flags value. */
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static int
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elf32_mt_machine (bfd *abfd)
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{
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switch (elf_elfheader (abfd)->e_flags & EF_MT_CPU_MASK)
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{
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case EF_MT_CPU_MRISC: return bfd_mach_ms1;
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case EF_MT_CPU_MRISC2: return bfd_mach_mrisc2;
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case EF_MT_CPU_MS2: return bfd_mach_ms2;
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}
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return bfd_mach_ms1;
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}
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static bool
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mt_elf_object_p (bfd *abfd)
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{
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bfd_default_set_arch_mach (abfd, bfd_arch_mt, elf32_mt_machine (abfd));
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return true;
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}
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/* Function to set the ELF flag bits. */
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static bool
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mt_elf_set_private_flags (bfd *abfd, flagword flags)
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{
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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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mt_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
|
||
{
|
||
bfd *obfd = info->output_bfd;
|
||
flagword old_flags, new_flags;
|
||
bool ok = true;
|
||
|
||
/* Check if we have the same endianness. */
|
||
if (!_bfd_generic_verify_endian_match (ibfd, info))
|
||
return false;
|
||
|
||
/* If they're not both mt, then merging is meaningless, so just
|
||
don't do it. */
|
||
if (strcmp (ibfd->arch_info->arch_name, "mt") != 0)
|
||
return true;
|
||
if (strcmp (obfd->arch_info->arch_name, "mt") != 0)
|
||
return true;
|
||
|
||
new_flags = elf_elfheader (ibfd)->e_flags;
|
||
old_flags = elf_elfheader (obfd)->e_flags;
|
||
|
||
#ifdef DEBUG
|
||
_bfd_error_handler ("%pB: old_flags = 0x%.8x, new_flags = 0x%.8x, init = %s",
|
||
ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no");
|
||
#endif
|
||
|
||
if (!elf_flags_init (obfd))
|
||
{
|
||
old_flags = new_flags;
|
||
elf_flags_init (obfd) = true;
|
||
}
|
||
else if ((new_flags & EF_MT_CPU_MASK) != (old_flags & EF_MT_CPU_MASK))
|
||
{
|
||
/* CPU has changed. This is invalid, because MRISC, MRISC2 and
|
||
MS2 are not subsets of each other. */
|
||
ok = false;
|
||
}
|
||
|
||
if (ok)
|
||
{
|
||
obfd->arch_info = ibfd->arch_info;
|
||
elf_elfheader (obfd)->e_flags = old_flags;
|
||
}
|
||
|
||
return ok;
|
||
}
|
||
|
||
static bool
|
||
mt_elf_print_private_bfd_data (bfd *abfd, void *ptr)
|
||
{
|
||
FILE *file = (FILE *) ptr;
|
||
flagword flags;
|
||
|
||
BFD_ASSERT (abfd != NULL && ptr != NULL);
|
||
|
||
/* Print normal ELF private data. */
|
||
_bfd_elf_print_private_bfd_data (abfd, ptr);
|
||
|
||
flags = elf_elfheader (abfd)->e_flags;
|
||
fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags);
|
||
|
||
switch (flags & EF_MT_CPU_MASK)
|
||
{
|
||
default:
|
||
case EF_MT_CPU_MRISC: fprintf (file, " ms1-16-002"); break;
|
||
case EF_MT_CPU_MRISC2: fprintf (file, " ms1-16-003"); break;
|
||
case EF_MT_CPU_MS2: fprintf (file, " ms2"); break;
|
||
}
|
||
|
||
fputc ('\n', file);
|
||
|
||
return true;
|
||
}
|
||
|
||
|
||
#define TARGET_BIG_SYM mt_elf32_vec
|
||
#define TARGET_BIG_NAME "elf32-mt"
|
||
|
||
#define ELF_ARCH bfd_arch_mt
|
||
#define ELF_MACHINE_CODE EM_MT
|
||
#define ELF_MAXPAGESIZE 1 /* No pages on the MT. */
|
||
|
||
#define elf_info_to_howto_rel NULL
|
||
#define elf_info_to_howto mt_info_to_howto_rela
|
||
|
||
#define elf_backend_relocate_section mt_elf_relocate_section
|
||
|
||
#define bfd_elf32_bfd_reloc_type_lookup mt_reloc_type_lookup
|
||
#define bfd_elf32_bfd_reloc_name_lookup mt_reloc_name_lookup
|
||
|
||
#define elf_backend_check_relocs mt_elf_check_relocs
|
||
#define elf_backend_object_p mt_elf_object_p
|
||
#define elf_backend_rela_normal 1
|
||
|
||
#define elf_backend_can_gc_sections 1
|
||
|
||
#define bfd_elf32_bfd_set_private_flags mt_elf_set_private_flags
|
||
#define bfd_elf32_bfd_merge_private_bfd_data mt_elf_merge_private_bfd_data
|
||
#define bfd_elf32_bfd_print_private_bfd_data mt_elf_print_private_bfd_data
|
||
|
||
#include "elf32-target.h"
|