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b48c61bccb
`fail'. * dwarf2.c (decode_line_info): Remove unused local variable `basic_block'. * elfcode.h (elf_slurp_reloc_table_from_section): Remove unsed local varibale `s'. * tekhex.c (tekhex_write_object_contents): Remove unused local variable `bytes_written'. * aout-ns32k.c (MY_swap_std_reloc_out): Remove unused local variable `r_addend'. * elf32-dlx.c (dlx_rtype_to_howto): Remove breaks after returns. * elfxx-mips.c (_bfd_elf_mips_mach): Remove breaks after returns. (_bfd_ns32k_relocate_contents): Remove break after return. * elf.c (bfd_section_from_shdr): Remove breaks after returns.
554 lines
19 KiB
C
554 lines
19 KiB
C
/* DLX specific support for 32-bit ELF
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Copyright 2002, 2003, 2004, 2005 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 2 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 "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/dlx.h"
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#define USE_REL 1
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#define bfd_elf32_bfd_reloc_type_lookup elf32_dlx_reloc_type_lookup
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#define elf_info_to_howto elf32_dlx_info_to_howto
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#define elf_info_to_howto_rel elf32_dlx_info_to_howto_rel
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#define elf_backend_check_relocs elf32_dlx_check_relocs
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/* The gas default behavior is not to preform the %hi modifier so that the
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GNU assembler can have the lower 16 bits offset placed in the insn, BUT
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we do like the gas to indicate it is %hi reloc type so when we in the link
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loader phase we can have the corrected hi16 vale replace the buggous lo16
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value that was placed there by gas. */
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static int skip_dlx_elf_hi16_reloc = 0;
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extern int set_dlx_skip_hi16_flag (int);
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int
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set_dlx_skip_hi16_flag (int flag)
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{
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skip_dlx_elf_hi16_reloc = flag;
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return flag;
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}
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static bfd_reloc_status_type
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_bfd_dlx_elf_hi16_reloc (bfd *abfd,
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arelent *reloc_entry,
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asymbol *symbol,
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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)
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{
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bfd_reloc_status_type ret;
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bfd_vma relocation;
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/* If the skip flag is set then we simply do the generic relocating, this
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is more of a hack for dlx gas/gld, so we do not need to do the %hi/%lo
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fixup like mips gld did. */
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if (skip_dlx_elf_hi16_reloc)
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return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
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input_section, output_bfd, error_message);
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/* If we're relocating, and this an external symbol, we don't want
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to change anything. */
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if (output_bfd != (bfd *) NULL
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&& (symbol->flags & BSF_SECTION_SYM) == 0
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&& reloc_entry->addend == 0)
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{
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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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ret = bfd_reloc_ok;
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if (bfd_is_und_section (symbol->section)
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&& output_bfd == (bfd *) NULL)
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ret = bfd_reloc_undefined;
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relocation = (bfd_is_com_section (symbol->section)) ? 0 : symbol->value;
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relocation += symbol->section->output_section->vma;
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relocation += symbol->section->output_offset;
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relocation += reloc_entry->addend;
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relocation += bfd_get_16 (abfd, (bfd_byte *)data + reloc_entry->address);
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if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
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return bfd_reloc_outofrange;
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bfd_put_16 (abfd, (short)((relocation >> 16) & 0xFFFF),
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(bfd_byte *)data + reloc_entry->address);
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return ret;
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}
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/* ELF relocs are against symbols. If we are producing relocatable
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output, and the reloc is against an external symbol, and nothing
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has given us any additional addend, the resulting reloc will also
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be against the same symbol. In such a case, we don't want to
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change anything about the way the reloc is handled, since it will
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all be done at final link time. Rather than put special case code
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into bfd_perform_relocation, all the reloc types use this howto
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function. It just short circuits the reloc if producing
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relocatable output against an external symbol. */
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static bfd_reloc_status_type
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elf32_dlx_relocate16 (bfd *abfd,
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arelent *reloc_entry,
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asymbol *symbol,
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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, vallo, allignment;
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int val;
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/* HACK: I think this first condition is necessary when producing
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relocatable output. After the end of HACK, the code is identical
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to bfd_elf_generic_reloc(). I would _guess_ the first change
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belongs there rather than here. martindo 1998-10-23. */
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if (skip_dlx_elf_hi16_reloc)
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return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
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input_section, output_bfd, error_message);
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/* Check undefined section and undefined symbols. */
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if (bfd_is_und_section (symbol->section)
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&& output_bfd == (bfd *) NULL)
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return bfd_reloc_undefined;
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/* Can not support a long jump to sections other then .text. */
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if (strcmp (input_section->name, symbol->section->output_section->name) != 0)
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{
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fprintf (stderr,
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"BFD Link Error: branch (PC rel16) to section (%s) not supported\n",
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symbol->section->output_section->name);
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return bfd_reloc_undefined;
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}
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insn = bfd_get_32 (abfd, (bfd_byte *)data + reloc_entry->address);
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allignment = 1 << (input_section->output_section->alignment_power - 1);
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vallo = insn & 0x0000FFFF;
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if (vallo & 0x8000)
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vallo = ~(vallo | 0xFFFF0000) + 1;
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/* vallo points to the vma of next instruction. */
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vallo += (((unsigned long)(input_section->output_section->vma +
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input_section->output_offset) +
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allignment) & ~allignment);
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/* val is the displacement (PC relative to next instruction). */
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val = (symbol->section->output_offset +
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symbol->section->output_section->vma +
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symbol->value) - vallo;
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if (abs ((int) val) > 0x00007FFF)
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return bfd_reloc_outofrange;
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insn = (insn & 0xFFFF0000) | (val & 0x0000FFFF);
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bfd_put_32 (abfd, insn,
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(bfd_byte *) data + reloc_entry->address);
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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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elf32_dlx_relocate26 (bfd *abfd,
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arelent *reloc_entry,
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asymbol *symbol,
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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, vallo, allignment;
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int val;
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/* HACK: I think this first condition is necessary when producing
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relocatable output. After the end of HACK, the code is identical
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to bfd_elf_generic_reloc(). I would _guess_ the first change
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belongs there rather than here. martindo 1998-10-23. */
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if (skip_dlx_elf_hi16_reloc)
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return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
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input_section, output_bfd, error_message);
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/* Check undefined section and undefined symbols. */
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if (bfd_is_und_section (symbol->section)
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&& output_bfd == (bfd *) NULL)
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return bfd_reloc_undefined;
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/* Can not support a long jump to sections other then .text */
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if (strcmp (input_section->name, symbol->section->output_section->name) != 0)
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{
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fprintf (stderr,
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"BFD Link Error: jump (PC rel26) to section (%s) not supported\n",
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symbol->section->output_section->name);
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return bfd_reloc_undefined;
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}
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insn = bfd_get_32 (abfd, (bfd_byte *)data + reloc_entry->address);
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allignment = 1 << (input_section->output_section->alignment_power - 1);
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vallo = insn & 0x03FFFFFF;
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if (vallo & 0x03000000)
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vallo = ~(vallo | 0xFC000000) + 1;
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/* vallo is the vma for the next instruction. */
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vallo += (((unsigned long) (input_section->output_section->vma +
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input_section->output_offset) +
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allignment) & ~allignment);
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/* val is the displacement (PC relative to next instruction). */
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val = (symbol->section->output_offset +
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symbol->section->output_section->vma + symbol->value)
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- vallo;
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if (abs ((int) val) > 0x01FFFFFF)
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return bfd_reloc_outofrange;
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insn = (insn & 0xFC000000) | (val & 0x03FFFFFF);
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bfd_put_32 (abfd, insn,
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(bfd_byte *) data + reloc_entry->address);
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return bfd_reloc_ok;
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}
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static reloc_howto_type dlx_elf_howto_table[]=
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{
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/* No relocation. */
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HOWTO (R_DLX_NONE, /* Type. */
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0, /* Rightshift. */
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0, /* 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_DLX_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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/* 8 bit relocation. */
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HOWTO (R_DLX_RELOC_8, /* Type. */
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0, /* Rightshift. */
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0, /* Size (0 = byte, 1 = short, 2 = long). */
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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_dont,/* Complain_on_overflow. */
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bfd_elf_generic_reloc, /* Special_function. */
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"R_DLX_RELOC_8", /* Name. */
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TRUE, /* Partial_inplace. */
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0xff, /* Src_mask. */
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0xff, /* Dst_mask. */
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FALSE), /* PCrel_offset. */
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/* 16 bit relocation. */
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HOWTO (R_DLX_RELOC_16, /* Type. */
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0, /* Rightshift. */
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1, /* 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_DLX_RELOC_16", /* Name. */
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TRUE, /* 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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/* 32 bit relocation. */
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HOWTO (R_DLX_RELOC_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_DLX_RELOC_32", /* 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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/* GNU extension to record C++ vtable hierarchy. */
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HOWTO (R_DLX_GNU_VTINHERIT, /* Type. */
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0, /* Rightshift. */
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2, /* Size (0 = byte, 1 = short, 2 = long). */
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0, /* Bitsize. */
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FALSE, /* PC_relative. */
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0, /* Bitpos. */
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complain_overflow_dont,/* Complain_on_overflow. */
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NULL, /* Special_function. */
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"R_DLX_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_DLX_GNU_VTENTRY, /* Type. */
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0, /* Rightshift. */
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2, /* Size (0 = byte, 1 = short, 2 = long). */
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0, /* Bitsize. */
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FALSE, /* PC_relative. */
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0, /* Bitpos. */
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complain_overflow_dont,/* Complain_on_overflow. */
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_bfd_elf_rel_vtable_reloc_fn,/* Special_function. */
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"R_DLX_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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/* 16 bit offset for pc-relative branches. */
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static reloc_howto_type elf_dlx_gnu_rel16_s2 =
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HOWTO (R_DLX_RELOC_16_PCREL, /* Type. */
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0, /* Rightshift. */
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1, /* 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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elf32_dlx_relocate16, /* Special_function. */
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"R_DLX_RELOC_16_PCREL",/* Name. */
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TRUE, /* 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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/* 26 bit offset for pc-relative branches. */
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static reloc_howto_type elf_dlx_gnu_rel26_s2 =
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HOWTO (R_DLX_RELOC_26_PCREL, /* Type. */
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0, /* Rightshift. */
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2, /* Size (0 = byte, 1 = short, 2 = long). */
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26, /* 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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elf32_dlx_relocate26, /* Special_function. */
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"R_DLX_RELOC_26_PCREL",/* Name. */
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TRUE, /* 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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/* High 16 bits of symbol value. */
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static reloc_howto_type elf_dlx_reloc_16_hi =
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HOWTO (R_DLX_RELOC_16_HI, /* Type. */
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16, /* 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_dlx_elf_hi16_reloc,/* Special_function. */
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"R_DLX_RELOC_16_HI", /* Name. */
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TRUE, /* 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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/* Low 16 bits of symbol value. */
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static reloc_howto_type elf_dlx_reloc_16_lo =
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HOWTO (R_DLX_RELOC_16_LO, /* Type. */
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0, /* Rightshift. */
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1, /* 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_DLX_RELOC_16_LO", /* Name. */
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TRUE, /* 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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/* A mapping from BFD reloc types to DLX ELF reloc types.
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Stolen from elf32-mips.c.
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More about this table - for dlx elf relocation we do not really
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need this table, if we have a rtype defined in this table will
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caused tc_gen_relocate confused and die on us, but if we remove
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this table it will caused more problem, so for now simple solution
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is to remove those entries which may cause problem. */
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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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enum elf_dlx_reloc_type elf_reloc_val;
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};
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static const struct elf_reloc_map dlx_reloc_map[] =
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{
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{ BFD_RELOC_NONE, R_DLX_NONE },
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{ BFD_RELOC_16, R_DLX_RELOC_16 },
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{ BFD_RELOC_32, R_DLX_RELOC_32 },
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{ BFD_RELOC_DLX_HI16_S, R_DLX_RELOC_16_HI },
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{ BFD_RELOC_DLX_LO16, R_DLX_RELOC_16_LO },
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{ BFD_RELOC_VTABLE_INHERIT, R_DLX_GNU_VTINHERIT },
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{ BFD_RELOC_VTABLE_ENTRY, R_DLX_GNU_VTENTRY }
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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 bfd_boolean
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elf32_dlx_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, **sym_hashes_end;
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const Elf_Internal_Rela *rel;
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const Elf_Internal_Rela *rel_end;
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if (info->relocatable)
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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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sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
|
|
if (!elf_bad_symtab (abfd))
|
|
sym_hashes_end -= symtab_hdr->sh_info;
|
|
|
|
rel_end = relocs + sec->reloc_count;
|
|
for (rel = relocs; rel < rel_end; rel++)
|
|
{
|
|
struct elf_link_hash_entry *h;
|
|
unsigned long r_symndx;
|
|
|
|
r_symndx = ELF32_R_SYM (rel->r_info);
|
|
if (r_symndx < symtab_hdr->sh_info)
|
|
h = NULL;
|
|
else
|
|
{
|
|
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
|
while (h->root.type == bfd_link_hash_indirect
|
|
|| h->root.type == bfd_link_hash_warning)
|
|
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
|
}
|
|
|
|
switch (ELF32_R_TYPE (rel->r_info))
|
|
{
|
|
/* This relocation describes the C++ object vtable hierarchy.
|
|
Reconstruct it for later use during GC. */
|
|
case R_DLX_GNU_VTINHERIT:
|
|
if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
|
|
return FALSE;
|
|
break;
|
|
|
|
/* This relocation describes which C++ vtable entries are actually
|
|
used. Record for later use during GC. */
|
|
case R_DLX_GNU_VTENTRY:
|
|
if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
|
|
return FALSE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Given a BFD reloc type, return a howto structure. */
|
|
|
|
static reloc_howto_type *
|
|
elf32_dlx_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
|
|
bfd_reloc_code_real_type code)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < sizeof (dlx_reloc_map) / sizeof (struct elf_reloc_map); i++)
|
|
if (dlx_reloc_map[i].bfd_reloc_val == code)
|
|
return &dlx_elf_howto_table[(int) dlx_reloc_map[i].elf_reloc_val];
|
|
|
|
switch (code)
|
|
{
|
|
default:
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return NULL;
|
|
case BFD_RELOC_16_PCREL_S2:
|
|
return &elf_dlx_gnu_rel16_s2;
|
|
case BFD_RELOC_DLX_JMP26:
|
|
return &elf_dlx_gnu_rel26_s2;
|
|
case BFD_RELOC_HI16_S:
|
|
return &elf_dlx_reloc_16_hi;
|
|
case BFD_RELOC_LO16:
|
|
return &elf_dlx_reloc_16_lo;
|
|
}
|
|
}
|
|
|
|
static reloc_howto_type *
|
|
dlx_rtype_to_howto (unsigned int r_type)
|
|
{
|
|
switch (r_type)
|
|
{
|
|
case R_DLX_RELOC_16_PCREL:
|
|
return & elf_dlx_gnu_rel16_s2;
|
|
case R_DLX_RELOC_26_PCREL:
|
|
return & elf_dlx_gnu_rel26_s2;
|
|
case R_DLX_RELOC_16_HI:
|
|
return & elf_dlx_reloc_16_hi;
|
|
case R_DLX_RELOC_16_LO:
|
|
return & elf_dlx_reloc_16_lo;
|
|
default:
|
|
BFD_ASSERT (r_type < (unsigned int) R_DLX_max);
|
|
return & dlx_elf_howto_table[r_type];
|
|
}
|
|
}
|
|
|
|
static void
|
|
elf32_dlx_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED,
|
|
arelent * cache_ptr ATTRIBUTE_UNUSED,
|
|
Elf_Internal_Rela * dst ATTRIBUTE_UNUSED)
|
|
{
|
|
abort ();
|
|
}
|
|
|
|
static void
|
|
elf32_dlx_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
|
|
arelent *cache_ptr,
|
|
Elf_Internal_Rela *dst)
|
|
{
|
|
unsigned int r_type;
|
|
|
|
r_type = ELF32_R_TYPE (dst->r_info);
|
|
cache_ptr->howto = dlx_rtype_to_howto (r_type);
|
|
return;
|
|
}
|
|
|
|
#define TARGET_BIG_SYM bfd_elf32_dlx_big_vec
|
|
#define TARGET_BIG_NAME "elf32-dlx"
|
|
#define ELF_ARCH bfd_arch_dlx
|
|
#define ELF_MACHINE_CODE EM_DLX
|
|
#define ELF_MAXPAGESIZE 1 /* FIXME: This number is wrong, It should be the page size in bytes. */
|
|
|
|
#include "elf32-target.h"
|