mirror of
https://github.com/autc04/Retro68.git
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326 lines
9.6 KiB
C
326 lines
9.6 KiB
C
/* Freescale S12Z-specific support for 32-bit ELF
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Copyright (C) 1999-2022 Free Software Foundation, Inc.
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(Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
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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 "bfdlink.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/s12z.h"
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/* All users of this file have bfd_octets_per_byte (abfd, sec) == 1. */
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#define OCTETS_PER_BYTE(ABFD, SEC) 1
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/* Relocation functions. */
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static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
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(bfd *, bfd_reloc_code_real_type);
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static bool s12z_info_to_howto_rel
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(bfd *, arelent *, Elf_Internal_Rela *);
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static bfd_reloc_status_type
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opru18_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol,
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void *data, asection *input_section ATTRIBUTE_UNUSED,
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bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED)
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{
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/* This reloc is used for 18 bit General Operand Addressing Postbyte in the
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INST opru18 form. This is an 18 bit reloc, but the most significant bit
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is shifted one place to the left of where it would normally be. See
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Appendix A.4 of the S12Z reference manual. */
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bfd_size_type octets = (reloc_entry->address
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* OCTETS_PER_BYTE (abfd, input_section));
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bfd_vma result = bfd_get_24 (abfd, (unsigned char *) data + octets);
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bfd_vma val = bfd_asymbol_value (symbol);
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/* Keep the wanted bits and discard the rest. */
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result &= 0xFA0000;
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val += symbol->section->output_section->vma;
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val += symbol->section->output_offset;
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/* The lowest 17 bits are copied verbatim. */
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result |= val & 0x1FFFF;
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/* The 18th bit is put into the 19th position. */
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result |= (val & 0x020000) << 1;
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bfd_put_24 (abfd, result, (unsigned char *) data + octets);
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return bfd_reloc_ok;
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}
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static bfd_reloc_status_type
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shift_addend_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol ATTRIBUTE_UNUSED,
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void *data ATTRIBUTE_UNUSED, asection *input_section ATTRIBUTE_UNUSED,
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bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED)
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{
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/* This is a really peculiar reloc, which is done for compatibility
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with the Freescale toolchain.
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That toolchain appears to (ab)use the lowest 15 bits of the addend for
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the purpose of holding flags. The purpose of these flags are unknown.
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So in this function, when writing the bfd we left shift the addend by
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15, and when reading we right shift it by 15 (discarding the lower bits).
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This allows the linker to work with object files generated by Freescale,
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as well as by Gas. */
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if (abfd->is_linker_input)
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reloc_entry->addend >>= 15;
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else
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reloc_entry->addend <<= 15;
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return bfd_reloc_continue;
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}
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#define USE_REL 0
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static reloc_howto_type elf_s12z_howto_table[] =
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{
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/* This reloc does nothing. */
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HOWTO (R_S12Z_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_S12Z_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 24 bit absolute relocation emitted by the OPR mode operands */
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HOWTO (R_S12Z_OPR, /* type */
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0, /* rightshift */
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3, /* size */
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24, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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shift_addend_reloc,
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"R_S12Z_OPR", /* name */
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false, /* partial_inplace */
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0x00ffffff, /* src_mask */
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0x00ffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* The purpose of this reloc is not known */
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HOWTO (R_S12Z_UKNWN_2, /* 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_S12Z_UKNWN_2", /* 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 15 bit PC-rel relocation */
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HOWTO (R_S12Z_PCREL_7_15, /* type */
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0, /* rightshift */
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2, /* size */
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15, /* 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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shift_addend_reloc,
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"R_S12Z_PCREL_7_15", /* name */
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false, /* partial_inplace */
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0x00, /* src_mask */
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0x007fff, /* dst_mask */
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true), /* pcrel_offset */
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/* A 24 bit absolute relocation emitted by EXT24 mode operands */
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HOWTO (R_S12Z_EXT24, /* type */
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0, /* rightshift */
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3, /* size */
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24, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_S12Z_EXT24", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x00ffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* An 18 bit absolute relocation */
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HOWTO (R_S12Z_EXT18, /* type */
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0, /* rightshift */
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3, /* 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_bitfield, /* complain_on_overflow */
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opru18_reloc, /* special_function */
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"R_S12Z_EXT18", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x0005ffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 32 bit absolute relocation. This kind of relocation is
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schizophrenic - Although they appear in sections named .rela.debug.*
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in some sections they behave as RELA relocs, but in others they have
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an added of zero and behave as REL.
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It is not recommended that new code emits this reloc. It is here
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only to support existing elf files generated by third party
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applications. */
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HOWTO (R_S12Z_CW32, /* 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_S12Z_CW32", /* name */
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false, /* 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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/* A 32 bit absolute relocation */
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HOWTO (R_S12Z_EXT32, /* 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_S12Z_EXT32", /* 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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};
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/* Map BFD reloc types to S12Z ELF reloc types. */
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struct s12z_reloc_map
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{
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bfd_reloc_code_real_type bfd_reloc_val;
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unsigned char elf_reloc_val;
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};
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static const struct s12z_reloc_map s12z_reloc_map[] =
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{
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/* bfd reloc val */ /* elf reloc val */
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{BFD_RELOC_NONE, R_S12Z_NONE},
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{BFD_RELOC_32, R_S12Z_EXT32},
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{BFD_RELOC_24, R_S12Z_EXT24},
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{BFD_RELOC_16_PCREL, R_S12Z_PCREL_7_15},
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{BFD_RELOC_S12Z_OPR, R_S12Z_OPR}
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};
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static reloc_howto_type *
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bfd_elf32_bfd_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;
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i < sizeof (s12z_reloc_map) / sizeof (struct s12z_reloc_map);
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i++)
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{
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if (s12z_reloc_map[i].bfd_reloc_val == code)
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{
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return &elf_s12z_howto_table[s12z_reloc_map[i].elf_reloc_val];
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}
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}
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printf ("%s:%d Not found type %d\n", __FILE__, __LINE__, code);
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return NULL;
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}
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static reloc_howto_type *
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bfd_elf32_bfd_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 (elf_s12z_howto_table)
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/ sizeof (elf_s12z_howto_table[0]));
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i++)
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if (elf_s12z_howto_table[i].name != NULL
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&& strcasecmp (elf_s12z_howto_table[i].name, r_name) == 0)
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return &elf_s12z_howto_table[i];
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return NULL;
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}
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/* Set the howto pointer for an S12Z ELF reloc. */
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static bool
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s12z_info_to_howto_rel (bfd *abfd,
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arelent *cache_ptr, Elf_Internal_Rela *dst)
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{
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unsigned int r_type = ELF32_R_TYPE (dst->r_info);
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if (r_type >= (unsigned int) R_S12Z_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 = &elf_s12z_howto_table[r_type];
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return true;
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}
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static bool
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s12z_elf_set_mach_from_flags (bfd *abfd)
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{
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bfd_default_set_arch_mach (abfd, bfd_arch_s12z, 0);
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return true;
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}
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#define ELF_ARCH bfd_arch_s12z
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#define ELF_MACHINE_CODE EM_S12Z
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#define ELF_MAXPAGESIZE 0x1000
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#define TARGET_BIG_SYM s12z_elf32_vec
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#define TARGET_BIG_NAME "elf32-s12z"
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#define elf_info_to_howto NULL
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#define elf_info_to_howto_rel s12z_info_to_howto_rel
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#define elf_backend_object_p s12z_elf_set_mach_from_flags
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#include "elf32-target.h"
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