mirror of
https://github.com/autc04/Retro68.git
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633 lines
17 KiB
C
633 lines
17 KiB
C
/* Zilog (e)Z80-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 S12Z port by Sergey Belyashov (sergey.belyashov@gmail.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/z80.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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typedef const struct {
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bfd_reloc_code_real_type r_type;
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reloc_howto_type howto;
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} bfd_howto_type;
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#define BFD_EMPTY_HOWTO(rt,x) {rt, EMPTY_HOWTO(x)}
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#define BFD_HOWTO(rt,a,b,c,d,e,f,g,h,i,j,k,l,m) {rt, HOWTO(a,b,c,d,e,f,g,h,i,j,k,l,m)}
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static bfd_reloc_status_type
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z80_elf_16_be_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol,
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void *data, asection *input_section, bfd *output_bfd,
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char **error_message);
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static const
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bfd_howto_type elf_z80_howto_table[] =
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{
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/* This reloc does nothing. */
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BFD_HOWTO (BFD_RELOC_NONE,
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R_Z80_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_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 8 bit relocation */
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BFD_HOWTO (BFD_RELOC_8,
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R_Z80_8, /* type */
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0, /* rightshift */
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1, /* size */
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8, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_imm8", /* name */
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false, /* partial_inplace */
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0x00, /* src_mask */
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0xff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 8 bit index register displacement relocation */
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BFD_HOWTO (BFD_RELOC_Z80_DISP8,
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R_Z80_8_DIS, /* type */
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0, /* rightshift */
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1, /* size */
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8, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_off", /* name */
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false, /* partial_inplace */
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0x00, /* src_mask */
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0xff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 8 bit PC-rel relocation */
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BFD_HOWTO (BFD_RELOC_8_PCREL,
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R_Z80_8_PCREL, /* type */
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0, /* rightshift */
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1, /* size */
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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_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_jr", /* name */
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false, /* partial_inplace */
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0x00, /* src_mask */
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0xff, /* dst_mask */
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true), /* pcrel_offset */
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/* An 16 bit absolute relocation */
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BFD_HOWTO (BFD_RELOC_16,
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R_Z80_16, /* type */
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0, /* rightshift */
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2, /* size */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_imm16", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 24 bit absolute relocation emitted by ADL mode operands */
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BFD_HOWTO (BFD_RELOC_24,
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R_Z80_24, /* 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_imm24", /* 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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BFD_HOWTO (BFD_RELOC_32,
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R_Z80_32, /* type */
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0, /* rightshift */
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4, /* size */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_imm32", /* 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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/* First (lowest) 8 bits of multibyte relocation */
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BFD_HOWTO (BFD_RELOC_Z80_BYTE0,
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R_Z80_BYTE0, /* type */
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0, /* rightshift */
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1, /* size */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_byte0", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xff, /* dst_mask */
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false), /* pcrel_offset */
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/* Second 8 bits of multibyte relocation */
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BFD_HOWTO (BFD_RELOC_Z80_BYTE1,
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R_Z80_BYTE1, /* type */
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8, /* rightshift */
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1, /* size */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_byte1", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xff, /* dst_mask */
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false), /* pcrel_offset */
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/* Third 8 bits of multibyte relocation */
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BFD_HOWTO (BFD_RELOC_Z80_BYTE2,
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R_Z80_BYTE2, /* type */
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16, /* rightshift */
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1, /* size */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_byte2", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xff, /* dst_mask */
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false), /* pcrel_offset */
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/* Fourth (highest) 8 bits of multibyte relocation */
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BFD_HOWTO (BFD_RELOC_Z80_BYTE3,
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R_Z80_BYTE3, /* type */
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24, /* rightshift */
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1, /* size */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_byte3", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0xff, /* dst_mask */
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false), /* pcrel_offset */
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/* An 16 bit absolute relocation of lower word of multibyte value */
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BFD_HOWTO (BFD_RELOC_Z80_WORD0,
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R_Z80_WORD0, /* type */
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0, /* rightshift */
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2, /* size */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_word0", /* 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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/* An 16 bit absolute relocation of higher word of multibyte value */
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BFD_HOWTO (BFD_RELOC_Z80_WORD1,
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R_Z80_WORD1, /* type */
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16, /* rightshift */
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2, /* size */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"r_word1", /* 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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/* An 16 bit big endian absolute relocation */
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BFD_HOWTO (BFD_RELOC_Z80_16_BE,
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R_Z80_16_BE, /* 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_bitfield, /* complain_on_overflow */
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z80_elf_16_be_reloc, /* special_function */
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"r_imm16be", /* name */
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false, /* partial_inplace */
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0x00000000, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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};
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static reloc_howto_type *
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z80_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
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{
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table_size = sizeof (elf_z80_howto_table) / sizeof (elf_z80_howto_table[0])
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};
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unsigned int i;
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for (i = 0; i < table_size; i++)
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{
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if (elf_z80_howto_table[i].r_type == code)
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return &elf_z80_howto_table[i].howto;
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}
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printf ("%s:%d Not found BFD reloc 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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z80_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
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{
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enum
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{
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table_size = sizeof (elf_z80_howto_table) / sizeof (elf_z80_howto_table[0])
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};
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unsigned int i;
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for (i = 0; i < table_size; i++)
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{
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if (elf_z80_howto_table[i].howto.name != NULL
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&& strcasecmp (elf_z80_howto_table[i].howto.name, r_name) == 0)
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return &elf_z80_howto_table[i].howto;
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}
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printf ("%s:%d Not found ELF reloc name `%s'\n", __FILE__, __LINE__, r_name);
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return NULL;
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}
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static reloc_howto_type *
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z80_rtype_to_howto (bfd *abfd, unsigned r_type)
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{
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enum
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{
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table_size = sizeof (elf_z80_howto_table) / sizeof (elf_z80_howto_table[0])
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};
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unsigned int i;
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for (i = 0; i < table_size; i++)
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{
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if (elf_z80_howto_table[i].howto.type == r_type)
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return &elf_z80_howto_table[i].howto;
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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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return NULL;
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}
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/* Set the howto pointer for an z80 ELF reloc. */
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static bool
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z80_info_to_howto_rela (bfd *abfd, 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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reloc_howto_type *howto = z80_rtype_to_howto (abfd, r_type);
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if (howto != NULL)
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{
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cache_ptr->howto = howto;
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return true;
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}
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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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static bfd_reloc_status_type
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z80_elf_final_link_relocate (unsigned long r_type,
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bfd *input_bfd,
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bfd *output_bfd ATTRIBUTE_UNUSED,
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asection *input_section ATTRIBUTE_UNUSED,
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bfd_byte *contents,
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bfd_vma offset,
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bfd_vma value,
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bfd_vma addend,
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struct bfd_link_info *info ATTRIBUTE_UNUSED,
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asection *sym_sec ATTRIBUTE_UNUSED,
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int is_local ATTRIBUTE_UNUSED)
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{
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bool r;
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reloc_howto_type *howto;
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switch (r_type)
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{
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case R_Z80_16_BE:
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value += addend;
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bfd_put_8 (input_bfd, value >> 8, contents + offset + 0);
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bfd_put_8 (input_bfd, value >> 0, contents + offset + 1);
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return bfd_reloc_ok;
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}
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howto = z80_rtype_to_howto (input_bfd, r_type);
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if (howto == NULL)
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return bfd_reloc_notsupported;
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r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents,
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offset, value, addend);
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return r ? bfd_reloc_ok : bfd_reloc_notsupported;
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}
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static int
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z80_elf_relocate_section (bfd *output_bfd,
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struct bfd_link_info *info,
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bfd *input_bfd,
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asection *input_section,
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bfd_byte *contents,
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Elf_Internal_Rela *relocs,
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Elf_Internal_Sym *local_syms,
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asection **local_sections)
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{
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Elf_Internal_Shdr *symtab_hdr;
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struct elf_link_hash_entry **sym_hashes;
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Elf_Internal_Rela *rel, *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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rel = relocs;
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relend = relocs + input_section->reloc_count;
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for (; rel < relend; rel++)
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{
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unsigned int r_type;
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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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/* This is a final link. */
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r_symndx = ELF32_R_SYM (rel->r_info);
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r_type = 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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}
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else
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{
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bool unresolved_reloc, warned, ignored;
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RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
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r_symndx, symtab_hdr, sym_hashes,
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h, sec, relocation,
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unresolved_reloc, warned, ignored);
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}
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if (sec != NULL && discarded_section (sec))
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{
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/* For relocs against symbols from removed linkonce sections,
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or sections discarded by a linker script, we just want the
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section contents cleared. Avoid any special processing. */
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reloc_howto_type *howto;
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howto = z80_rtype_to_howto (input_bfd, r_type);
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RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
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rel, 1, relend, howto, 0, contents);
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}
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if (bfd_link_relocatable (info))
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continue;
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z80_elf_final_link_relocate (r_type, input_bfd, output_bfd,
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input_section,
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contents, rel->r_offset,
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relocation, rel->r_addend,
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info, sec, h == NULL);
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}
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return true;
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}
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/* The final processing done just before writing out a Z80 ELF object
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file. This gets the Z80 architecture right based on the machine
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number. */
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static bool
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z80_elf_final_write_processing (bfd *abfd)
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{
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unsigned long val = bfd_get_mach (abfd);
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switch (val)
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{
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default:
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_bfd_error_handler (_("%pB: unsupported bfd mach %#lx"),
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abfd, val);
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/* fall through */
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case bfd_mach_z80:
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case bfd_mach_z80full:
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case bfd_mach_z80strict:
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val = EF_Z80_MACH_Z80;
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break;
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case bfd_mach_gbz80:
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val = EF_Z80_MACH_GBZ80;
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break;
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case bfd_mach_z80n:
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val = EF_Z80_MACH_Z80N;
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break;
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case bfd_mach_z180:
|
|
val = EF_Z80_MACH_Z180;
|
|
break;
|
|
case bfd_mach_ez80_z80:
|
|
val = EF_Z80_MACH_EZ80_Z80;
|
|
break;
|
|
case bfd_mach_ez80_adl:
|
|
val = EF_Z80_MACH_EZ80_ADL;
|
|
break;
|
|
case bfd_mach_r800:
|
|
val = EF_Z80_MACH_R800;
|
|
break;
|
|
}
|
|
elf_elfheader (abfd)->e_machine = EM_Z80;
|
|
elf_elfheader (abfd)->e_flags &= ~EF_Z80_MACH_MSK;
|
|
elf_elfheader (abfd)->e_flags |= val;
|
|
return _bfd_elf_final_write_processing (abfd);
|
|
}
|
|
|
|
/* Set the right machine number. */
|
|
static bool
|
|
z80_elf_object_p (bfd *abfd)
|
|
{
|
|
unsigned int mach;
|
|
|
|
if (elf_elfheader (abfd)->e_machine == EM_Z80)
|
|
{
|
|
int e_mach = elf_elfheader (abfd)->e_flags & EF_Z80_MACH_MSK;
|
|
switch (e_mach)
|
|
{
|
|
default:
|
|
_bfd_error_handler (_("%pB: unsupported mach %#x"),
|
|
abfd, e_mach);
|
|
/* fall through */
|
|
case EF_Z80_MACH_Z80:
|
|
mach = bfd_mach_z80;
|
|
break;
|
|
case EF_Z80_MACH_GBZ80:
|
|
mach = bfd_mach_gbz80;
|
|
break;
|
|
case EF_Z80_MACH_Z180:
|
|
mach = bfd_mach_z180;
|
|
break;
|
|
case EF_Z80_MACH_EZ80_Z80:
|
|
mach = bfd_mach_ez80_z80;
|
|
break;
|
|
case EF_Z80_MACH_EZ80_ADL:
|
|
mach = bfd_mach_ez80_adl;
|
|
break;
|
|
case EF_Z80_MACH_R800:
|
|
mach = bfd_mach_r800;
|
|
break;
|
|
case EF_Z80_MACH_Z80N:
|
|
mach = bfd_mach_z80n;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
_bfd_error_handler (_("%pB: unsupported arch %#x"),
|
|
abfd, elf_elfheader (abfd)->e_machine);
|
|
mach = bfd_mach_z80;
|
|
}
|
|
return bfd_default_set_arch_mach (abfd, bfd_arch_z80, mach);
|
|
}
|
|
|
|
static bool
|
|
z80_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED,
|
|
const char * name)
|
|
{
|
|
return (name[0] == '.' && name[1] == 'L') ||
|
|
_bfd_elf_is_local_label_name (abfd, name);
|
|
}
|
|
|
|
static bfd_reloc_status_type
|
|
z80_elf_16_be_reloc (bfd *abfd,
|
|
arelent *reloc_entry,
|
|
asymbol *symbol,
|
|
void *data,
|
|
asection *input_section,
|
|
bfd *output_bfd,
|
|
char **error_message)
|
|
{
|
|
bfd_vma val;
|
|
long x;
|
|
bfd_size_type octets = (reloc_entry->address
|
|
* OCTETS_PER_BYTE (abfd, input_section));
|
|
|
|
/* If this is a relocatable link (output_bfd test tells us), just
|
|
call the generic function. Any adjustment will be done at final
|
|
link time. */
|
|
if (output_bfd != NULL)
|
|
return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
|
|
input_section, output_bfd, error_message);
|
|
|
|
/* Get symbol value. */
|
|
val = 0;
|
|
if (!bfd_is_com_section (symbol->section))
|
|
val = symbol->value;
|
|
val += symbol->section->output_offset + input_section->output_offset;
|
|
if (symbol->section->output_section)
|
|
val += symbol->section->output_section->vma;
|
|
|
|
val += reloc_entry->addend;
|
|
if (reloc_entry->howto->partial_inplace)
|
|
{
|
|
x = bfd_get_8 (abfd, (bfd_byte *) data + octets + 0) * 0x100;
|
|
x += bfd_get_8 (abfd, (bfd_byte *) data + octets + 1);
|
|
x &= ~reloc_entry->howto->src_mask;
|
|
}
|
|
else
|
|
x = 0;
|
|
|
|
x |= val & reloc_entry->howto->dst_mask;
|
|
if (x < -0x8000 || x >= 0x10000)
|
|
return bfd_reloc_outofrange;
|
|
|
|
bfd_put_8 (abfd, x >> 8, (bfd_byte *) data + octets + 0);
|
|
bfd_put_8 (abfd, x >> 0, (bfd_byte *) data + octets + 1);
|
|
return bfd_reloc_ok;
|
|
}
|
|
|
|
#define ELF_ARCH bfd_arch_z80
|
|
#define ELF_MACHINE_CODE EM_Z80
|
|
#define ELF_MAXPAGESIZE 0x10000
|
|
|
|
#define TARGET_LITTLE_SYM z80_elf32_vec
|
|
#define TARGET_LITTLE_NAME "elf32-z80"
|
|
|
|
#define elf_backend_can_refcount 1
|
|
#define elf_backend_can_gc_sections 1
|
|
#define elf_backend_stack_align 1
|
|
#define elf_backend_rela_normal 1
|
|
|
|
#define elf_info_to_howto z80_info_to_howto_rela
|
|
#define elf_info_to_howto_rel z80_info_to_howto_rela
|
|
|
|
#define elf_backend_final_write_processing z80_elf_final_write_processing
|
|
#define elf_backend_object_p z80_elf_object_p
|
|
#define elf_backend_relocate_section z80_elf_relocate_section
|
|
|
|
#define bfd_elf32_bfd_reloc_type_lookup z80_reloc_type_lookup
|
|
#define bfd_elf32_bfd_reloc_name_lookup z80_reloc_name_lookup
|
|
#define bfd_elf32_bfd_is_local_label_name z80_is_local_label_name
|
|
|
|
#include "elf32-target.h"
|