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/* BFD back-end for raw ARM a.out binaries. |
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Copyright (C) 1994-2014 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 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
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#include "sysdep.h" |
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#include "bfd.h" |
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/* Avoid multiple definitions from aoutx if supporting standard a.out |
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as well as our own. */ |
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/* Do not "beautify" the CONCAT* macro args. Traditional C will not |
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remove whitespace added here, and thus will fail to concatenate |
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the tokens. */ |
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#define NAME(x,y) CONCAT3 (aoutarm,_32_,y) |
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#define N_TXTADDR(x) \ |
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((N_MAGIC (x) == NMAGIC) \ |
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? (bfd_vma) 0x8000 \ |
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: ((N_MAGIC (x) != ZMAGIC) \ |
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? (bfd_vma) 0 \ |
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: ((N_SHARED_LIB (x)) \ |
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? ((x).a_entry & ~(bfd_vma) (TARGET_PAGE_SIZE - 1)) \ |
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: (bfd_vma) 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) CONCAT2 (arm_aout_,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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#define MY_bfd_reloc_type_lookup arm_aout_bfd_reloc_type_lookup |
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#define MY_bfd_reloc_name_lookup arm_aout_bfd_reloc_name_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) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
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static bfd_reloc_status_type |
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MY (fix_pcrel_26_done) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); |
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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 |
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readmask setmask 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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static reloc_howto_type * |
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MY (reloc_howto) (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 howto_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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howto_index = r_length + 4 * r_pcrel_done + 8 * r_neg; |
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if (howto_index == 3) |
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*r_pcrel = 1; |
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return MY (howto_table) + howto_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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static void |
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MY (put_reloc) (bfd *abfd, |
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int r_extern, |
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int r_index, |
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bfd_vma 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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/* Size as a power of two. */ |
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r_length = howto->size; |
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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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static void |
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MY (relocatable_reloc) (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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/* The reloc is still external, so don't modify anything. */ |
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*amount = 0; |
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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) (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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void * 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) (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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bfd_vma relocation; |
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bfd_size_type addr = reloc_entry->address; |
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bfd_vma 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 (bfd_is_und_section (symbol->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 != 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 & ~ (bfd_vma) 0x03ffffff) |
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flag = bfd_reloc_overflow; |
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target &= ~ (bfd_vma) 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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static reloc_howto_type * |
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MY (bfd_reloc_type_lookup) (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_arch_bits_per_address (abfd)) |
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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: |
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return NULL; |
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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: |
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return NULL; |
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} |
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} |
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static reloc_howto_type * |
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MY (bfd_reloc_name_lookup) (bfd *abfd ATTRIBUTE_UNUSED, |
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const char *r_name) |
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{ |
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unsigned int i; |
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for (i = 0; |
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i < sizeof (MY (howto_table)) / sizeof (MY (howto_table)[0]); |
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i++) |
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if (MY (howto_table)[i].name != NULL |
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&& strcasecmp (MY (howto_table)[i].name, r_name) == 0) |
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return &MY (howto_table)[i]; |
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return NULL; |
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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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void MY_swap_std_reloc_in (bfd *, struct reloc_std_external *, arelent *, asymbol **, bfd_size_type); |
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void MY_swap_std_reloc_out (bfd *, arelent *, struct reloc_std_external *); |
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#include "aoutx.h" |
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void |
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MY_swap_std_reloc_in (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 = 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 (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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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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/* 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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|| bfd_is_abs_section (output_section) |
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|| bfd_is_und_section (output_section)) |
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{ |
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if (bfd_abs_section_ptr->symbol == sym) |
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{ |
|
|
/* Whoops, looked like an abs symbol, but is really an offset |
|
|
from the abs section. */ |
|
|
r_index = 0; |
|
|
r_extern = 0; |
|
|
} |
|
|
else |
|
|
{ |
|
|
/* Fill in symbol. */ |
|
|
r_extern = 1; |
|
|
r_index = (*(g->sym_ptr_ptr))->KEEPIT; |
|
|
} |
|
|
} |
|
|
else |
|
|
{ |
|
|
/* Just an ordinary section. */ |
|
|
r_extern = 0; |
|
|
r_index = output_section->target_index; |
|
|
} |
|
|
|
|
|
/* Now the fun stuff. */ |
|
|
if (bfd_header_big_endian (abfd)) |
|
|
{ |
|
|
natptr->r_index[0] = r_index >> 16; |
|
|
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 arm_aout_be_vec; |
|
|
|
|
|
const bfd_target arm_aout_le_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. */ |
|
|
0, /* match priority. */ |
|
|
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, /* Headers. */ |
|
|
{_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), |
|
|
|
|
|
& arm_aout_be_vec, |
|
|
|
|
|
(void *) MY_backend_data, |
|
|
}; |
|
|
|
|
|
const bfd_target arm_aout_be_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. */ |
|
|
0, /* match priority. */ |
|
|
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, /* Headers. */ |
|
|
{_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), |
|
|
|
|
|
& arm_aout_le_vec, |
|
|
|
|
|
(void *) MY_backend_data, |
|
|
};
|
|
|
|
