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553 lines
17 KiB
C
553 lines
17 KiB
C
/* BFD back-end for raw ARM a.out binaries.
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Copyright (C) 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc.
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Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
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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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#define N_TXTADDR(x) \
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((N_MAGIC(x) == NMAGIC) ? 0x8000 : \
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(N_MAGIC(x) != ZMAGIC) ? 0 : \
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(N_SHARED_LIB(x)) ? ((x).a_entry & ~(TARGET_PAGE_SIZE - 1)) : \
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TEXT_START_ADDR)
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#define TEXT_START_ADDR 0x8000
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#define TARGET_PAGE_SIZE 0x8000
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#define SEGMENT_SIZE TARGET_PAGE_SIZE
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#define DEFAULT_ARCH bfd_arch_arm
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#define MY(OP) CAT(aoutarm_,OP)
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#define N_BADMAG(x) ((((x).a_info & ~007200) != ZMAGIC) && \
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(((x).a_info & ~006000) != OMAGIC) && \
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((x).a_info != NMAGIC))
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#define N_MAGIC(x) ((x).a_info & ~07200)
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#include "bfd.h"
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#include "sysdep.h"
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#define MYARM(OP) CAT(aoutarm_,OP)
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reloc_howto_type *MYARM(bfd_reloc_type_lookup)
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PARAMS((bfd *, bfd_reloc_code_real_type));
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static boolean MYARM(write_object_contents) PARAMS((bfd *));
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/* Avoid multiple defininitions from aoutx if supporting standarad a.out
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as well as our own. */
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#define NAME(x,y) CAT3(aoutarm,_32_,y)
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#define MY_bfd_reloc_type_lookup aoutarm_bfd_reloc_type_lookup
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#include "libaout.h"
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#include "aout/aout64.h"
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static bfd_reloc_status_type
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MY(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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MY(fix_pcrel_26) PARAMS ((bfd *, arelent *, asymbol *, PTR,
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asection *, bfd *, char **));
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static void MY(swap_std_reloc_in) PARAMS ((bfd *, struct reloc_std_external *,
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arelent *, asymbol **,
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bfd_size_type));
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void MY(swap_std_reloc_out) PARAMS ((bfd *, arelent *,
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struct reloc_std_external *));
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reloc_howto_type MY(howto_table)[] =
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{
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/* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask
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pcdone */
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HOWTO (0, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "8", true,
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0x000000ff, 0x000000ff, false),
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HOWTO (1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16", true,
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0x0000ffff, 0x0000ffff, false),
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HOWTO (2, 0, 2, 32, false, 0, complain_overflow_bitfield, 0, "32", true,
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0xffffffff, 0xffffffff, false),
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HOWTO (3, 2, 2, 26, true, 0, complain_overflow_signed, MY(fix_pcrel_26),
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"ARM26", true, 0x00ffffff, 0x00ffffff, true),
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HOWTO (4, 0, 0, 8, true, 0, complain_overflow_signed, 0, "DISP8", true,
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0x000000ff, 0x000000ff, true),
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HOWTO (5, 0, 1, 16, true, 0, complain_overflow_signed, 0, "DISP16", true,
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0x0000ffff, 0x0000ffff, true),
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HOWTO (6, 0, 2, 32, true, 0, complain_overflow_signed, 0, "DISP32", true,
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0xffffffff, 0xffffffff, true),
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HOWTO (7, 2, 2, 26, false, 0, complain_overflow_signed,
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MY(fix_pcrel_26_done), "ARM26D", true, 0x0, 0x0,
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false),
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EMPTY_HOWTO (-1),
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HOWTO (9, 0, -1, 16, false, 0, complain_overflow_bitfield, 0, "NEG16", true,
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0x0000ffff, 0x0000ffff, false),
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HOWTO (10, 0, -2, 32, false, 0, complain_overflow_bitfield, 0, "NEG32", true,
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0xffffffff, 0xffffffff, false)
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};
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#define RELOC_ARM_BITS_NEG_BIG ((unsigned int) 0x08)
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#define RELOC_ARM_BITS_NEG_LITTLE ((unsigned int) 0x10)
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reloc_howto_type *
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MY(reloc_howto)(abfd, rel, r_index, r_extern, r_pcrel)
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bfd *abfd;
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struct reloc_std_external *rel;
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int *r_index;
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int *r_extern;
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int *r_pcrel;
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{
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unsigned int r_length;
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unsigned int r_pcrel_done;
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unsigned int r_neg;
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int index;
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*r_pcrel = 0;
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if (bfd_header_big_endian (abfd))
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{
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*r_index = ((rel->r_index[0] << 16)
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| (rel->r_index[1] << 8)
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| rel->r_index[2]);
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*r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_BIG));
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r_pcrel_done = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_BIG));
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r_neg = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_BIG));
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r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_BIG)
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>> RELOC_STD_BITS_LENGTH_SH_BIG);
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}
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else
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{
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*r_index = ((rel->r_index[2] << 16)
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| (rel->r_index[1] << 8)
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| rel->r_index[0]);
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*r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));
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r_pcrel_done = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));
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r_neg = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_LITTLE));
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r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE)
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>> RELOC_STD_BITS_LENGTH_SH_LITTLE);
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}
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index = r_length + 4 * r_pcrel_done + 8 * r_neg;
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if (index == 3)
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*r_pcrel = 1;
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return MY(howto_table) + index;
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}
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#define MY_reloc_howto(BFD, REL, IN, EX, PC) \
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MY(reloc_howto) (BFD, REL, &IN, &EX, &PC)
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void
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MY(put_reloc)(abfd, r_extern, r_index, value, howto, reloc)
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bfd *abfd;
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int r_extern;
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int r_index;
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long value;
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reloc_howto_type *howto;
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struct reloc_std_external *reloc;
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{
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unsigned int r_length;
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int r_pcrel;
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int r_neg;
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PUT_WORD (abfd, value, reloc->r_address);
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r_length = howto->size ; /* Size as a power of two */
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/* Special case for branch relocations. */
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if (howto->type == 3 || howto->type == 7)
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r_length = 3;
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r_pcrel = howto->type & 4; /* PC Relative done? */
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r_neg = howto->type & 8; /* Negative relocation */
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if (bfd_header_big_endian (abfd))
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{
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reloc->r_index[0] = r_index >> 16;
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reloc->r_index[1] = r_index >> 8;
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reloc->r_index[2] = r_index;
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reloc->r_type[0] =
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((r_extern ? RELOC_STD_BITS_EXTERN_BIG : 0)
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| (r_pcrel ? RELOC_STD_BITS_PCREL_BIG : 0)
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| (r_neg ? RELOC_ARM_BITS_NEG_BIG : 0)
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| (r_length << RELOC_STD_BITS_LENGTH_SH_BIG));
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}
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else
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{
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reloc->r_index[2] = r_index >> 16;
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reloc->r_index[1] = r_index >> 8;
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reloc->r_index[0] = r_index;
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reloc->r_type[0] =
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((r_extern ? RELOC_STD_BITS_EXTERN_LITTLE : 0)
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| (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE : 0)
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| (r_neg ? RELOC_ARM_BITS_NEG_LITTLE : 0)
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| (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE));
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}
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}
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#define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \
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MY(put_reloc)(BFD, EXT, IDX, VAL, HOWTO, RELOC)
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void
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MY(relocatable_reloc)(howto, abfd, reloc, amount, r_addr)
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reloc_howto_type *howto;
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bfd *abfd;
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struct reloc_std_external *reloc;
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bfd_vma *amount;
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bfd_vma r_addr;
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{
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if (howto->type == 3)
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{
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if (reloc->r_type[0]
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& (bfd_header_big_endian (abfd)
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? RELOC_STD_BITS_EXTERN_BIG : RELOC_STD_BITS_EXTERN_LITTLE))
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{
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/* The reloc is still external, so don't modify anything. */
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*amount = 0;
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}
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else
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{
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*amount -= r_addr;
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/* Change the r_pcrel value -- on the ARM, this bit is set once the
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relocation is done. */
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if (bfd_header_big_endian (abfd))
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reloc->r_type[0] |= RELOC_STD_BITS_PCREL_BIG;
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else
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reloc->r_type[0] |= RELOC_STD_BITS_PCREL_LITTLE;
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}
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}
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else if (howto->type == 7)
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*amount = 0;
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}
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#define MY_relocatable_reloc(HOW, BFD, REL, AMOUNT, ADDR) \
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MY(relocatable_reloc)(HOW, BFD, REL, &(AMOUNT), ADDR)
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static bfd_reloc_status_type
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MY(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 ATTRIBUTE_UNUSED;
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arelent *reloc_entry ATTRIBUTE_UNUSED;
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asymbol *symbol ATTRIBUTE_UNUSED;
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PTR data ATTRIBUTE_UNUSED;
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asection *input_section ATTRIBUTE_UNUSED;
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bfd *output_bfd ATTRIBUTE_UNUSED;
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char **error_message ATTRIBUTE_UNUSED;
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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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MY(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 ATTRIBUTE_UNUSED;
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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_ok : 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_ok;
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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 & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 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 = &MY(howto_table)[7];
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return flag;
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}
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reloc_howto_type *
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MY(bfd_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 &MY(howto_table)[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 MY_swap_std_reloc_in MY(swap_std_reloc_in)
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#define MY_swap_std_reloc_out MY(swap_std_reloc_out)
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#define MY_get_section_contents _bfd_generic_get_section_contents
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/* #define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create */
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/* #define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols */
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/* #define MY_bfd_final_link _bfd_generic_final_link */
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#include "aoutx.h"
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static void
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MY_swap_std_reloc_in (abfd, bytes, cache_ptr, symbols, symcount)
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bfd *abfd;
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struct reloc_std_external *bytes;
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arelent *cache_ptr;
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asymbol **symbols;
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bfd_size_type symcount ATTRIBUTE_UNUSED;
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{
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int r_index;
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int r_extern;
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int r_pcrel;
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struct aoutdata *su = &(abfd->tdata.aout_data->a);
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cache_ptr->address = bfd_h_get_32 (abfd, bytes->r_address);
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cache_ptr->howto = MY_reloc_howto (abfd, bytes, r_index, r_extern, r_pcrel);
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MOVE_ADDRESS (0);
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}
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void
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MY_swap_std_reloc_out (abfd, g, natptr)
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bfd *abfd;
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arelent *g;
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struct reloc_std_external *natptr;
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{
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int r_index;
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asymbol *sym = *(g->sym_ptr_ptr);
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int r_extern;
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int r_length;
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int r_pcrel;
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int r_neg = 0; /* Negative relocs use the BASEREL bit. */
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asection *output_section = sym->section->output_section;
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PUT_WORD(abfd, g->address, natptr->r_address);
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r_length = g->howto->size ; /* Size as a power of two */
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if (r_length < 0)
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{
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r_length = -r_length;
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r_neg = 1;
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}
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r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */
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/* For RISC iX, in pc-relative relocs the r_pcrel bit means that the
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relocation has been done already (Only for the 26-bit one I think)???!!!
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*/
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if (g->howto->type == 3)
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{
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r_length = 3;
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r_pcrel = 0;
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}
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else if (g->howto->type == 7)
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{
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r_length = 3;
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r_pcrel = 1;
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}
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#if 0
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/* For a standard reloc, the addend is in the object file. */
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r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;
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#endif
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/* name was clobbered by aout_write_syms to be symbol index */
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/* If this relocation is relative to a symbol then set the
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r_index to the symbols index, and the r_extern bit.
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Absolute symbols can come in in two ways, either as an offset
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from the abs section, or as a symbol which has an abs value.
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check for that here
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*/
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if (bfd_is_com_section (output_section)
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|| output_section == &bfd_abs_section
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|| output_section == &bfd_und_section)
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{
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if (bfd_abs_section.symbol == sym)
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{
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/* Whoops, looked like an abs symbol, but is really an offset
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from the abs section */
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r_index = 0;
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r_extern = 0;
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}
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else
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{
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/* Fill in symbol */
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r_extern = 1;
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r_index = (*(g->sym_ptr_ptr))->KEEPIT;
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}
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}
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else
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{
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/* Just an ordinary section */
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r_extern = 0;
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r_index = output_section->target_index;
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}
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/* now the fun stuff */
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if (bfd_header_big_endian (abfd))
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{
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natptr->r_index[0] = r_index >> 16;
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natptr->r_index[1] = r_index >> 8;
|
|
natptr->r_index[2] = r_index;
|
|
natptr->r_type[0] =
|
|
( (r_extern ? RELOC_STD_BITS_EXTERN_BIG: 0)
|
|
| (r_pcrel ? RELOC_STD_BITS_PCREL_BIG: 0)
|
|
| (r_neg ? RELOC_ARM_BITS_NEG_BIG: 0)
|
|
| (r_length << RELOC_STD_BITS_LENGTH_SH_BIG));
|
|
}
|
|
else
|
|
{
|
|
natptr->r_index[2] = r_index >> 16;
|
|
natptr->r_index[1] = r_index >> 8;
|
|
natptr->r_index[0] = r_index;
|
|
natptr->r_type[0] =
|
|
( (r_extern ? RELOC_STD_BITS_EXTERN_LITTLE: 0)
|
|
| (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE: 0)
|
|
| (r_neg ? RELOC_ARM_BITS_NEG_LITTLE: 0)
|
|
| (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE));
|
|
}
|
|
}
|
|
|
|
#define MY_BFD_TARGET
|
|
|
|
#include "aout-target.h"
|
|
|
|
extern const bfd_target aout_arm_big_vec;
|
|
|
|
const bfd_target aout_arm_little_vec =
|
|
{
|
|
"a.out-arm-little", /* name */
|
|
bfd_target_aout_flavour,
|
|
BFD_ENDIAN_LITTLE, /* target byte order (little) */
|
|
BFD_ENDIAN_LITTLE, /* target headers byte order (little) */
|
|
(HAS_RELOC | EXEC_P | /* object flags */
|
|
HAS_LINENO | HAS_DEBUG |
|
|
HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
|
|
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
|
|
MY_symbol_leading_char,
|
|
AR_PAD_CHAR, /* ar_pad_char */
|
|
15, /* ar_max_namelen */
|
|
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
|
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
|
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
|
|
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
|
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
|
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
|
|
{_bfd_dummy_target, MY_object_p, /* bfd_check_format */
|
|
bfd_generic_archive_p, MY_core_file_p},
|
|
{bfd_false, MY_mkobject, /* bfd_set_format */
|
|
_bfd_generic_mkarchive, bfd_false},
|
|
{bfd_false, MY_write_object_contents, /* bfd_write_contents */
|
|
_bfd_write_archive_contents, bfd_false},
|
|
|
|
BFD_JUMP_TABLE_GENERIC (MY),
|
|
BFD_JUMP_TABLE_COPY (MY),
|
|
BFD_JUMP_TABLE_CORE (MY),
|
|
BFD_JUMP_TABLE_ARCHIVE (MY),
|
|
BFD_JUMP_TABLE_SYMBOLS (MY),
|
|
BFD_JUMP_TABLE_RELOCS (MY),
|
|
BFD_JUMP_TABLE_WRITE (MY),
|
|
BFD_JUMP_TABLE_LINK (MY),
|
|
BFD_JUMP_TABLE_DYNAMIC (MY),
|
|
|
|
& aout_arm_big_vec,
|
|
|
|
(PTR) MY_backend_data,
|
|
};
|
|
|
|
const bfd_target aout_arm_big_vec =
|
|
{
|
|
"a.out-arm-big", /* name */
|
|
bfd_target_aout_flavour,
|
|
BFD_ENDIAN_BIG, /* target byte order (big) */
|
|
BFD_ENDIAN_BIG, /* target headers byte order (big) */
|
|
(HAS_RELOC | EXEC_P | /* object flags */
|
|
HAS_LINENO | HAS_DEBUG |
|
|
HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
|
|
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
|
|
MY_symbol_leading_char,
|
|
AR_PAD_CHAR, /* ar_pad_char */
|
|
15, /* ar_max_namelen */
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
|
|
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
|
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
|
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
|
|
{_bfd_dummy_target, MY_object_p, /* bfd_check_format */
|
|
bfd_generic_archive_p, MY_core_file_p},
|
|
{bfd_false, MY_mkobject, /* bfd_set_format */
|
|
_bfd_generic_mkarchive, bfd_false},
|
|
{bfd_false, MY_write_object_contents, /* bfd_write_contents */
|
|
_bfd_write_archive_contents, bfd_false},
|
|
|
|
BFD_JUMP_TABLE_GENERIC (MY),
|
|
BFD_JUMP_TABLE_COPY (MY),
|
|
BFD_JUMP_TABLE_CORE (MY),
|
|
BFD_JUMP_TABLE_ARCHIVE (MY),
|
|
BFD_JUMP_TABLE_SYMBOLS (MY),
|
|
BFD_JUMP_TABLE_RELOCS (MY),
|
|
BFD_JUMP_TABLE_WRITE (MY),
|
|
BFD_JUMP_TABLE_LINK (MY),
|
|
BFD_JUMP_TABLE_DYNAMIC (MY),
|
|
|
|
& aout_arm_little_vec,
|
|
|
|
(PTR) MY_backend_data,
|
|
};
|