362 lines
10 KiB
C
362 lines
10 KiB
C
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/* picoJava specific support for 32-bit ELF
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Copyright (C) 1999-2022 Free Software Foundation, Inc.
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Contributed by Steve Chamberlan of Transmeta (sac@pobox.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/pj.h"
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/* This function is used for normal relocs. This is like the COFF
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function, and is almost certainly incorrect for other ELF targets. */
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static bfd_reloc_status_type
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pj_elf_reloc (bfd *abfd,
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arelent *reloc_entry,
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asymbol *symbol_in,
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void * data,
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asection *input_section,
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bfd *output_bfd,
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char **error_message ATTRIBUTE_UNUSED)
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{
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unsigned long insn;
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bfd_vma sym_value;
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enum elf_pj_reloc_type r_type;
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bfd_vma addr = reloc_entry->address;
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bfd_byte *hit_data = addr + (bfd_byte *) data;
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r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type;
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if (output_bfd != NULL)
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{
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/* Partial linking--do nothing. */
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reloc_entry->address += input_section->output_offset;
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return bfd_reloc_ok;
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}
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if (symbol_in != NULL
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&& (symbol_in->flags & BSF_WEAK) == 0
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&& bfd_is_und_section (symbol_in->section))
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return bfd_reloc_undefined;
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if (bfd_is_com_section (symbol_in->section))
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sym_value = 0;
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else
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sym_value = (symbol_in->value +
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symbol_in->section->output_section->vma +
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symbol_in->section->output_offset);
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switch (r_type)
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{
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case R_PJ_DATA_DIR32:
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insn = bfd_get_32 (abfd, hit_data);
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insn += sym_value + reloc_entry->addend;
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bfd_put_32 (abfd, (bfd_vma) insn, hit_data);
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break;
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/* Relocations in code are always bigendian, no matter what the
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data endianness is. */
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case R_PJ_CODE_DIR32:
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insn = bfd_getb32 (hit_data);
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insn += sym_value + reloc_entry->addend;
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bfd_putb32 ((bfd_vma) insn, hit_data);
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break;
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case R_PJ_CODE_REL16:
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insn = bfd_getb16 (hit_data);
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insn += sym_value + reloc_entry->addend
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- (input_section->output_section->vma
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+ input_section->output_offset);
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bfd_putb16 ((bfd_vma) insn, hit_data);
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break;
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case R_PJ_CODE_LO16:
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insn = bfd_getb16 (hit_data);
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insn += sym_value + reloc_entry->addend;
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bfd_putb16 ((bfd_vma) insn, hit_data);
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break;
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case R_PJ_CODE_HI16:
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insn = bfd_getb16 (hit_data);
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insn += (sym_value + reloc_entry->addend) >> 16;
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bfd_putb16 ((bfd_vma) insn, hit_data);
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break;
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default:
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abort ();
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break;
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}
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return bfd_reloc_ok;
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}
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static reloc_howto_type pj_elf_howto_table[] =
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{
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/* No relocation. */
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HOWTO (R_PJ_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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pj_elf_reloc, /* special_function */
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"R_PJ_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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/* 32 bit absolute relocation. Setting partial_inplace to TRUE and
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src_mask to a non-zero value is similar to the COFF toolchain. */
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HOWTO (R_PJ_DATA_DIR32, /* type */
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0, /* rightshift */
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4, /* size */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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pj_elf_reloc, /* special_function */
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"R_PJ_DIR32", /* 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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/* 32 bit PC relative relocation. */
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HOWTO (R_PJ_CODE_REL32, /* type */
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0, /* rightshift */
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4, /* size */
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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_signed, /* complain_on_overflow */
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pj_elf_reloc, /* special_function */
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"R_PJ_REL32", /* 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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/* 16 bit PC relative relocation. */
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HOWTO (R_PJ_CODE_REL16, /* type */
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0, /* rightshift */
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2, /* size */
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16, /* bitsize */
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true, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overf6w */
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pj_elf_reloc, /* special_function */
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"R_PJ_REL16", /* name */
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false, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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true), /* pcrel_offset */
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EMPTY_HOWTO (4),
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EMPTY_HOWTO (5),
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HOWTO (R_PJ_CODE_DIR32, /* type */
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0, /* rightshift */
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4, /* size */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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pj_elf_reloc, /* special_function */
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"R_PJ_CODE_DIR32", /* 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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EMPTY_HOWTO (7),
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EMPTY_HOWTO (8),
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EMPTY_HOWTO (9),
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EMPTY_HOWTO (10),
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EMPTY_HOWTO (11),
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EMPTY_HOWTO (12),
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HOWTO (R_PJ_CODE_LO16, /* type */
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0, /* rightshift */
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2, /* size */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_unsigned, /* complain_on_overflow */
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pj_elf_reloc, /* special_function */
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"R_PJ_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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true), /* pcrel_offset */
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HOWTO (R_PJ_CODE_HI16, /* type */
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16, /* rightshift */
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2, /* size */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_unsigned, /* complain_on_overflow */
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pj_elf_reloc, /* special_function */
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"R_PJ_HI16", /* name */
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false, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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true), /* pcrel_offset */
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/* GNU extension to record C++ vtable hierarchy. */
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HOWTO (R_PJ_GNU_VTINHERIT, /* type */
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0, /* rightshift */
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4, /* 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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NULL, /* special_function */
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"R_PJ_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_PJ_GNU_VTENTRY, /* type */
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0, /* rightshift */
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4, /* 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_rel_vtable_reloc_fn, /* special_function */
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"R_PJ_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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};
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/* This structure is used to map BFD reloc codes to PJ ELF relocs. */
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struct elf_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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/* An array mapping BFD reloc codes to PJ ELF relocs. */
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static const struct elf_reloc_map pj_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_PJ_NONE },
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{ BFD_RELOC_32, R_PJ_DATA_DIR32 },
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{ BFD_RELOC_PJ_CODE_DIR16, R_PJ_CODE_DIR16 },
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{ BFD_RELOC_PJ_CODE_DIR32, R_PJ_CODE_DIR32 },
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{ BFD_RELOC_PJ_CODE_LO16, R_PJ_CODE_LO16 },
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{ BFD_RELOC_PJ_CODE_HI16, R_PJ_CODE_HI16 },
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{ BFD_RELOC_PJ_CODE_REL32, R_PJ_CODE_REL32 },
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{ BFD_RELOC_PJ_CODE_REL16, R_PJ_CODE_REL16 },
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{ BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
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{ BFD_RELOC_VTABLE_ENTRY, R_PJ_GNU_VTENTRY },
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};
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/* Given a BFD reloc code, return the howto structure for the
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corresponding PJ ELf reloc. */
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static reloc_howto_type *
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pj_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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unsigned int i;
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for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
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if (pj_reloc_map[i].bfd_reloc_val == code)
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return & pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
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return NULL;
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}
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static reloc_howto_type *
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pj_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 (pj_elf_howto_table) / sizeof (pj_elf_howto_table[0]);
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i++)
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if (pj_elf_howto_table[i].name != NULL
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&& strcasecmp (pj_elf_howto_table[i].name, r_name) == 0)
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return &pj_elf_howto_table[i];
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return NULL;
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}
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/* Given an ELF reloc, fill in the howto field of a relent. */
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static bool
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pj_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;
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r = ELF32_R_TYPE (dst->r_info);
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if (r >= R_PJ_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);
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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 = &pj_elf_howto_table[r];
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return true;
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}
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/* Take this moment to fill in the special picoJava bits in the
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e_flags field. */
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static bool
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pj_elf_final_write_processing (bfd *abfd)
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{
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elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
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elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
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return _bfd_elf_final_write_processing (abfd);
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}
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#define TARGET_BIG_SYM pj_elf32_vec
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#define TARGET_BIG_NAME "elf32-pj"
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#define TARGET_LITTLE_SYM pj_elf32_le_vec
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#define TARGET_LITTLE_NAME "elf32-pjl"
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#define ELF_ARCH bfd_arch_pj
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#define ELF_MACHINE_CODE EM_PJ
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#define ELF_MACHINE_ALT1 EM_PJ_OLD
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#define ELF_MAXPAGESIZE 0x1000
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#define bfd_elf32_bfd_get_relocated_section_contents \
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bfd_generic_get_relocated_section_contents
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#define bfd_elf32_bfd_reloc_type_lookup pj_elf_reloc_type_lookup
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#define bfd_elf32_bfd_reloc_name_lookup pj_elf_reloc_name_lookup
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#define elf_backend_final_write_processing pj_elf_final_write_processing
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#define elf_info_to_howto pj_elf_info_to_howto
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#include "elf32-target.h"
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