564 lines
14 KiB
C
564 lines
14 KiB
C
/* BFD back-end for Intel arm COFF files.
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Copyright 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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Written by Cygnus Support.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "obstack.h"
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#include "coff/arm.h"
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#include "coff/internal.h"
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#ifdef COFF_WITH_PE
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#include "coff/pe.h"
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#endif
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#include "libcoff.h"
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static bfd_reloc_status_type
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aoutarm_fix_pcrel_26_done PARAMS ((bfd *, arelent *, asymbol *, PTR,
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asection *, bfd *, char **));
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static bfd_reloc_status_type
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aoutarm_fix_pcrel_26 PARAMS ((bfd *, arelent *, asymbol *, PTR,
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asection *, bfd *, char **));
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static bfd_reloc_status_type coff_arm_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type
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coff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
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error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol;
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PTR 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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symvalue diff;
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if (output_bfd == (bfd *) NULL)
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return bfd_reloc_continue;
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if (bfd_is_com_section (symbol->section))
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{
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/* We are relocating a common symbol. The current value in the
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object file is ORIG + OFFSET, where ORIG is the value of the
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common symbol as seen by the object file when it was compiled
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(this may be zero if the symbol was undefined) and OFFSET is
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the offset into the common symbol (normally zero, but may be
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non-zero when referring to a field in a common structure).
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ORIG is the negative of reloc_entry->addend, which is set by
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the CALC_ADDEND macro below. We want to replace the value in
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the object file with NEW + OFFSET, where NEW is the value of
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the common symbol which we are going to put in the final
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object file. NEW is symbol->value. */
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diff = symbol->value + reloc_entry->addend;
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}
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else
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{
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/* For some reason bfd_perform_relocation always effectively
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ignores the addend for a COFF target when producing
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relocateable output. This seems to be always wrong for 386
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COFF, so we handle the addend here instead. */
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diff = reloc_entry->addend;
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}
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#define DOIT(x) \
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x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
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if (diff != 0)
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{
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reloc_howto_type *howto = reloc_entry->howto;
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unsigned char *addr = (unsigned char *) data + reloc_entry->address;
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switch (howto->size)
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{
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case 0:
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{
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char x = bfd_get_8 (abfd, addr);
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DOIT (x);
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bfd_put_8 (abfd, x, addr);
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}
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break;
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case 1:
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{
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short x = bfd_get_16 (abfd, addr);
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DOIT (x);
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bfd_put_16 (abfd, x, addr);
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}
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break;
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case 2:
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{
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long x = bfd_get_32 (abfd, addr);
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DOIT (x);
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bfd_put_32 (abfd, x, addr);
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}
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break;
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default:
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abort ();
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}
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}
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/* Now let bfd_perform_relocation finish everything up. */
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return bfd_reloc_continue;
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}
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static reloc_howto_type aoutarm_std_reloc_howto[] =
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{
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/* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
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HOWTO(0, /* type */
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0, /* rs */
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0, /* size */
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8, /* bsz */
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false, /* pcrel */
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0, /* bitpos */
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complain_overflow_bitfield, /* ovf */
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coff_arm_reloc, /* sf */
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"8", /*name */
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true, /* partial */
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0x000000ff, /*read mask */
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0x000000ff, /* setmask */
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PCRELOFFSET /* pcdone */),
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HOWTO(1,
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0,
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1,
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16,
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false,
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0,
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complain_overflow_bitfield,
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coff_arm_reloc,
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"16",
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true,
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0x0000ffff,
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0x0000ffff,
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PCRELOFFSET),
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HOWTO( 2,
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0,
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2,
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32,
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false,
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0,
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complain_overflow_bitfield,
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coff_arm_reloc,
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"32",
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true,
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0xffffffff,
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0xffffffff,
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PCRELOFFSET),
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HOWTO( 3,
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2,
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3,
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26,
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true,
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0,
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complain_overflow_signed,
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aoutarm_fix_pcrel_26 ,
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"ARM26",
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true,
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0x00ffffff,
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0x00ffffff,
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PCRELOFFSET),
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HOWTO( 4,
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0,
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0,
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8,
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true,
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0,
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complain_overflow_signed,
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coff_arm_reloc,
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"DISP8",
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true,
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0x000000ff,
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0x000000ff,
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true),
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HOWTO( 5,
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0,
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1,
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16,
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true,
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0,
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complain_overflow_signed,
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coff_arm_reloc,
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"DISP16",
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true,
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0x0000ffff,
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0x0000ffff,
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true),
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HOWTO( 6,
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0,
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2,
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32,
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true,
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0,
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complain_overflow_signed,
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coff_arm_reloc,
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"DISP32",
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true,
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0xffffffff,
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0xffffffff,
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true),
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HOWTO( 7,
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2,
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3,
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26,
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false,
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0,
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complain_overflow_signed,
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aoutarm_fix_pcrel_26_done,
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"ARM26D",
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true,
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0x00ffffff,
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0x00ffffff,
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false),
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{-1},
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HOWTO( 9,
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0,
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-1,
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16,
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false,
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0,
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complain_overflow_bitfield,
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coff_arm_reloc,
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"NEG16",
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true,
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0x0000ffff,
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0x0000ffff,
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false),
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HOWTO( 10,
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0,
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-2,
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32,
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false,
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0,
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complain_overflow_bitfield,
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coff_arm_reloc,
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"NEG32",
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true,
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0xffffffff,
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0xffffffff,
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false)
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};
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#define RTYPE2HOWTO(cache_ptr, dst) \
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(cache_ptr)->howto = aoutarm_std_reloc_howto + (dst)->r_type;
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static bfd_reloc_status_type
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aoutarm_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
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output_bfd, error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol;
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PTR 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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/* This is dead simple at present. */
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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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aoutarm_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
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output_bfd, error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol;
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PTR 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_vma relocation;
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bfd_size_type addr = reloc_entry->address;
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long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
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bfd_reloc_status_type flag = bfd_reloc_ok;
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/* If this is an undefined symbol, return error */
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if (symbol->section == &bfd_und_section
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&& (symbol->flags & BSF_WEAK) == 0)
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return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
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/* If the sections are different, and we are doing a partial relocation,
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just ignore it for now. */
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if (symbol->section->name != input_section->name
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&& output_bfd != (bfd *)NULL)
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return bfd_reloc_continue;
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relocation = (target & 0x00ffffff) << 2;
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relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
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relocation += 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 -= input_section->output_section->vma;
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relocation -= input_section->output_offset;
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relocation -= addr;
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if (relocation & 3)
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return bfd_reloc_overflow;
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/* Check for overflow */
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if (relocation & 0x02000000)
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{
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if ((relocation & ~0x03ffffff) != ~0x03ffffff)
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flag = bfd_reloc_overflow;
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}
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else if (relocation & ~0x03ffffff)
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flag = bfd_reloc_overflow;
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target &= ~0x00ffffff;
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target |= (relocation >> 2) & 0x00ffffff;
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bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
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/* Now the ARM magic... Change the reloc type so that it is marked as done.
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Strictly this is only necessary if we are doing a partial relocation. */
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reloc_entry->howto = &aoutarm_std_reloc_howto[7];
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return flag;
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}
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static CONST struct reloc_howto_struct *
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arm_reloc_type_lookup(abfd,code)
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bfd *abfd;
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bfd_reloc_code_real_type code;
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{
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#define ASTD(i,j) case i: return &aoutarm_std_reloc_howto[j]
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if (code == BFD_RELOC_CTOR)
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switch (bfd_get_arch_info (abfd)->bits_per_address)
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{
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case 32:
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code = BFD_RELOC_32;
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break;
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default: return (CONST struct reloc_howto_struct *) 0;
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}
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switch (code)
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{
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ASTD (BFD_RELOC_16, 1);
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ASTD (BFD_RELOC_32, 2);
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ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3);
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ASTD (BFD_RELOC_8_PCREL, 4);
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ASTD (BFD_RELOC_16_PCREL, 5);
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ASTD (BFD_RELOC_32_PCREL, 6);
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default: return (CONST struct reloc_howto_struct *) 0;
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}
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}
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#define coff_bfd_reloc_type_lookup arm_reloc_type_lookup
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#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
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/* The page size is a guess based on ELF. */
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#define COFF_PAGE_SIZE 0x1000
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/* For some reason when using arm COFF the value stored in the .text
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section for a reference to a common symbol is the value itself plus
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any desired offset. Ian Taylor, Cygnus Support. */
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/* If we are producing relocateable output, we need to do some
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adjustments to the object file that are not done by the
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bfd_perform_relocation function. This function is called by every
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reloc type to make any required adjustments. */
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static bfd_reloc_status_type
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aacoff_arm_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
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error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol;
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PTR 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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symvalue diff;
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if (output_bfd == (bfd *) NULL)
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return bfd_reloc_continue;
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if (bfd_is_com_section (symbol->section))
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{
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/* We are relocating a common symbol. The current value in the
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object file is ORIG + OFFSET, where ORIG is the value of the
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common symbol as seen by the object file when it was compiled
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(this may be zero if the symbol was undefined) and OFFSET is
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the offset into the common symbol (normally zero, but may be
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non-zero when referring to a field in a common structure).
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ORIG is the negative of reloc_entry->addend, which is set by
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the CALC_ADDEND macro below. We want to replace the value in
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the object file with NEW + OFFSET, where NEW is the value of
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the common symbol which we are going to put in the final
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object file. NEW is symbol->value. */
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diff = symbol->value + reloc_entry->addend;
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}
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else
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{
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/* For some reason bfd_perform_relocation always effectively
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ignores the addend for a COFF target when producing
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relocateable output. This seems to be always wrong for arm
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COFF, so we handle the addend here instead. */
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diff = reloc_entry->addend;
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}
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#define DOIT(x) \
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x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
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if (diff != 0)
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{
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reloc_howto_type *howto = reloc_entry->howto;
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unsigned char *addr = (unsigned char *) data + reloc_entry->address;
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switch (howto->size)
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{
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case 0:
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{
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char x = bfd_get_8 (abfd, addr);
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DOIT (x);
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bfd_put_8 (abfd, x, addr);
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}
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break;
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case 1:
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{
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short x = bfd_get_16 (abfd, addr);
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DOIT (x);
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bfd_put_16 (abfd, x, addr);
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}
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break;
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case 2:
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{
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long x = bfd_get_32 (abfd, addr);
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DOIT (x);
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bfd_put_32 (abfd, x, addr);
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}
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break;
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default:
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abort ();
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}
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}
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/* Now let bfd_perform_relocation finish everything up. */
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return bfd_reloc_continue;
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}
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/* Turn a howto into a reloc nunmber */
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#define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
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#define BADMAG(x) ARMBADMAG(x)
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#define ARM 1 /* Customize coffcode.h */
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/* On SCO Unix 3.2.2 the native assembler generates two .data
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sections. We handle that by renaming the second one to .data2. It
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does no harm to do this for any arm COFF target. */
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#define TWO_DATA_SECS
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/* For arm COFF a STYP_NOLOAD | STYP_BSS section is part of a shared
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library. On some other COFF targets STYP_BSS is normally
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STYP_NOLOAD. */
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#define BSS_NOLOAD_IS_SHARED_LIBRARY
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/* We use the special COFF backend linker. */
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#define coff_relocate_section _bfd_coff_generic_relocate_section
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#include "coffcode.h"
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static const bfd_target *
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i3coff_object_p(a)
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bfd *a;
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{
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return coff_object_p(a);
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}
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const bfd_target
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#ifdef TARGET_SYM
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TARGET_SYM =
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#else
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armcoff_vec =
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#endif
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{
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#ifdef TARGET_NAME
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TARGET_NAME,
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#else
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"coff-arm", /* name */
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#endif
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bfd_target_coff_flavour,
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false, /* data byte order is little */
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false, /* header byte order is little */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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#ifdef TARGET_UNDERSCORE
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TARGET_UNDERSCORE, /* leading underscore */
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#else
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0, /* leading underscore */
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#endif
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'/', /* ar_pad_char */
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15, /* ar_max_namelen */
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2, /* minimum alignment power */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
|
|
|
|
/* Note that we allow an object file to be treated as a core file as well. */
|
|
{_bfd_dummy_target, i3coff_object_p, /* bfd_check_format */
|
|
bfd_generic_archive_p, i3coff_object_p},
|
|
{bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
|
|
bfd_false},
|
|
{bfd_false, coff_write_object_contents, /* bfd_write_contents */
|
|
_bfd_write_archive_contents, bfd_false},
|
|
|
|
BFD_JUMP_TABLE_GENERIC (coff),
|
|
BFD_JUMP_TABLE_COPY (coff),
|
|
BFD_JUMP_TABLE_CORE (_bfd_nocore),
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
|
|
BFD_JUMP_TABLE_SYMBOLS (coff),
|
|
BFD_JUMP_TABLE_RELOCS (coff),
|
|
BFD_JUMP_TABLE_WRITE (coff),
|
|
BFD_JUMP_TABLE_LINK (coff),
|
|
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
|
|
|
|
COFF_SWAP_TABLE,
|
|
};
|