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binutils-gdb/bfd/aout-arm.c

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/* BFD back-end for raw ARM a.out binaries.
Copyright (C) 1994-2017 Free Software Foundation, Inc.
Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
/* Avoid multiple definitions from aoutx if supporting standard a.out
as well as our own. */
/* Do not "beautify" the CONCAT* macro args. Traditional C will not
remove whitespace added here, and thus will fail to concatenate
the tokens. */
#define NAME(x,y) CONCAT3 (aoutarm,_32_,y)
#define N_TXTADDR(x) \
((N_MAGIC (x) == NMAGIC) \
? (bfd_vma) 0x8000 \
: ((N_MAGIC (x) != ZMAGIC) \
? (bfd_vma) 0 \
: ((N_SHARED_LIB (x)) \
? ((x)->a_entry & ~(bfd_vma) (TARGET_PAGE_SIZE - 1)) \
: (bfd_vma) TEXT_START_ADDR)))
#define TEXT_START_ADDR 0x8000
#define TARGET_PAGE_SIZE 0x8000
#define SEGMENT_SIZE TARGET_PAGE_SIZE
#define DEFAULT_ARCH bfd_arch_arm
#define MY(OP) CONCAT2 (arm_aout_,OP)
#define N_BADMAG(x) ((((x)->a_info & ~007200) != ZMAGIC) && \
(((x)->a_info & ~006000) != OMAGIC) && \
((x)->a_info != NMAGIC))
#define N_MAGIC(x) ((x)->a_info & ~07200)
#define MY_bfd_reloc_type_lookup arm_aout_bfd_reloc_type_lookup
#define MY_bfd_reloc_name_lookup arm_aout_bfd_reloc_name_lookup
#include "libaout.h"
#include "aout/aout64.h"
static bfd_reloc_status_type
MY (fix_pcrel_26) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
static bfd_reloc_status_type
MY (fix_pcrel_26_done) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
reloc_howto_type MY (howto_table)[] =
{
/* Type rs size bsz pcrel bitpos ovrf sf name part_inpl
readmask setmask pcdone. */
HOWTO (0, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "8", TRUE,
0x000000ff, 0x000000ff, FALSE),
HOWTO (1, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 0, "16", TRUE,
0x0000ffff, 0x0000ffff, FALSE),
HOWTO (2, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "32", TRUE,
0xffffffff, 0xffffffff, FALSE),
HOWTO (3, 2, 2, 26, TRUE, 0, complain_overflow_signed, MY (fix_pcrel_26),
"ARM26", TRUE, 0x00ffffff, 0x00ffffff, TRUE),
HOWTO (4, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0, "DISP8", TRUE,
0x000000ff, 0x000000ff, TRUE),
HOWTO (5, 0, 1, 16, TRUE, 0, complain_overflow_signed, 0, "DISP16", TRUE,
0x0000ffff, 0x0000ffff, TRUE),
HOWTO (6, 0, 2, 32, TRUE, 0, complain_overflow_signed, 0, "DISP32", TRUE,
0xffffffff, 0xffffffff, TRUE),
HOWTO (7, 2, 2, 26, FALSE, 0, complain_overflow_signed,
MY (fix_pcrel_26_done), "ARM26D", TRUE, 0x0, 0x0,
FALSE),
EMPTY_HOWTO (-1),
HOWTO (9, 0, -1, 16, FALSE, 0, complain_overflow_bitfield, 0, "NEG16", TRUE,
0x0000ffff, 0x0000ffff, FALSE),
HOWTO (10, 0, -2, 32, FALSE, 0, complain_overflow_bitfield, 0, "NEG32", TRUE,
0xffffffff, 0xffffffff, FALSE)
};
#define RELOC_ARM_BITS_NEG_BIG ((unsigned int) 0x08)
#define RELOC_ARM_BITS_NEG_LITTLE ((unsigned int) 0x10)
static reloc_howto_type *
MY (reloc_howto) (bfd *abfd,
struct reloc_std_external *rel,
int *r_index,
int *r_extern,
int *r_pcrel)
{
unsigned int r_length;
unsigned int r_pcrel_done;
unsigned int r_neg;
int howto_index;
*r_pcrel = 0;
if (bfd_header_big_endian (abfd))
{
*r_index = ((rel->r_index[0] << 16)
| (rel->r_index[1] << 8)
| rel->r_index[2]);
*r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_BIG));
r_pcrel_done = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_BIG));
r_neg = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_BIG));
r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_BIG)
>> RELOC_STD_BITS_LENGTH_SH_BIG);
}
else
{
*r_index = ((rel->r_index[2] << 16)
| (rel->r_index[1] << 8)
| rel->r_index[0]);
*r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));
r_pcrel_done = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));
r_neg = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_LITTLE));
r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE)
>> RELOC_STD_BITS_LENGTH_SH_LITTLE);
}
howto_index = r_length + 4 * r_pcrel_done + 8 * r_neg;
if (howto_index == 3)
*r_pcrel = 1;
return MY (howto_table) + howto_index;
}
#define MY_reloc_howto(BFD, REL, IN, EX, PC) \
MY (reloc_howto) (BFD, REL, &IN, &EX, &PC)
static void
MY (put_reloc) (bfd *abfd,
int r_extern,
int r_index,
bfd_vma value,
reloc_howto_type *howto,
struct reloc_std_external *reloc)
{
unsigned int r_length;
int r_pcrel;
int r_neg;
PUT_WORD (abfd, value, reloc->r_address);
/* Size as a power of two. */
r_length = howto->size;
/* Special case for branch relocations. */
if (howto->type == 3 || howto->type == 7)
r_length = 3;
r_pcrel = howto->type & 4; /* PC Relative done? */
r_neg = howto->type & 8; /* Negative relocation. */
if (bfd_header_big_endian (abfd))
{
reloc->r_index[0] = r_index >> 16;
reloc->r_index[1] = r_index >> 8;
reloc->r_index[2] = r_index;
reloc->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
{
reloc->r_index[2] = r_index >> 16;
reloc->r_index[1] = r_index >> 8;
reloc->r_index[0] = r_index;
reloc->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_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \
MY (put_reloc) (BFD, EXT, IDX, VAL, HOWTO, RELOC)
static void
MY (relocatable_reloc) (reloc_howto_type *howto,
bfd *abfd,
struct reloc_std_external *reloc,
bfd_vma *amount,
bfd_vma r_addr)
{
if (howto->type == 3)
{
if (reloc->r_type[0]
& (bfd_header_big_endian (abfd)
? RELOC_STD_BITS_EXTERN_BIG : RELOC_STD_BITS_EXTERN_LITTLE))
/* The reloc is still external, so don't modify anything. */
*amount = 0;
else
{
*amount -= r_addr;
/* Change the r_pcrel value -- on the ARM, this bit is set once the
relocation is done. */
if (bfd_header_big_endian (abfd))
reloc->r_type[0] |= RELOC_STD_BITS_PCREL_BIG;
else
reloc->r_type[0] |= RELOC_STD_BITS_PCREL_LITTLE;
}
}
else if (howto->type == 7)
*amount = 0;
}
#define MY_relocatable_reloc(HOW, BFD, REL, AMOUNT, ADDR) \
MY (relocatable_reloc) (HOW, BFD, REL, &(AMOUNT), ADDR)
static bfd_reloc_status_type
MY (fix_pcrel_26_done) (bfd *abfd ATTRIBUTE_UNUSED,
arelent *reloc_entry ATTRIBUTE_UNUSED,
asymbol *symbol ATTRIBUTE_UNUSED,
void * data ATTRIBUTE_UNUSED,
asection *input_section ATTRIBUTE_UNUSED,
bfd *output_bfd ATTRIBUTE_UNUSED,
char **error_message ATTRIBUTE_UNUSED)
{
/* This is dead simple at present. */
return bfd_reloc_ok;
}
static bfd_reloc_status_type
MY (fix_pcrel_26) (bfd *abfd,
arelent *reloc_entry,
asymbol *symbol,
void * data,
asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
bfd_vma relocation;
bfd_size_type addr = reloc_entry->address;
bfd_vma target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
bfd_reloc_status_type flag = bfd_reloc_ok;
/* If this is an undefined symbol, return error. */
if (bfd_is_und_section (symbol->section)
&& (symbol->flags & BSF_WEAK) == 0)
return output_bfd ? bfd_reloc_ok : bfd_reloc_undefined;
/* If the sections are different, and we are doing a partial relocation,
just ignore it for now. */
if (symbol->section->name != input_section->name
&& output_bfd != NULL)
return bfd_reloc_ok;
relocation = (target & 0x00ffffff) << 2;
relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */
relocation += symbol->value;
relocation += symbol->section->output_section->vma;
relocation += symbol->section->output_offset;
relocation += reloc_entry->addend;
relocation -= input_section->output_section->vma;
relocation -= input_section->output_offset;
relocation -= addr;
if (relocation & 3)
return bfd_reloc_overflow;
/* Check for overflow. */
if (relocation & 0x02000000)
{
if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
flag = bfd_reloc_overflow;
}
else if (relocation & ~ (bfd_vma) 0x03ffffff)
flag = bfd_reloc_overflow;
target &= ~ (bfd_vma) 0x00ffffff;
target |= (relocation >> 2) & 0x00ffffff;
bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
/* Now the ARM magic... Change the reloc type so that it is marked as done.
Strictly this is only necessary if we are doing a partial relocation. */
reloc_entry->howto = &MY (howto_table)[7];
return flag;
}
static reloc_howto_type *
MY (bfd_reloc_type_lookup) (bfd *abfd,
bfd_reloc_code_real_type code)
{
#define ASTD(i,j) case i: return & MY (howto_table)[j]
if (code == BFD_RELOC_CTOR)
switch (bfd_arch_bits_per_address (abfd))
{
case 32:
code = BFD_RELOC_32;
break;
default:
return NULL;
}
switch (code)
{
ASTD (BFD_RELOC_16, 1);
ASTD (BFD_RELOC_32, 2);
ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3);
ASTD (BFD_RELOC_8_PCREL, 4);
ASTD (BFD_RELOC_16_PCREL, 5);
ASTD (BFD_RELOC_32_PCREL, 6);
default:
return NULL;
}
}
static reloc_howto_type *
MY (bfd_reloc_name_lookup) (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (MY (howto_table)) / sizeof (MY (howto_table)[0]);
i++)
if (MY (howto_table)[i].name != NULL
&& strcasecmp (MY (howto_table)[i].name, r_name) == 0)
return &MY (howto_table)[i];
return NULL;
}
#define MY_swap_std_reloc_in MY (swap_std_reloc_in)
#define MY_swap_std_reloc_out MY (swap_std_reloc_out)
#define MY_get_section_contents _bfd_generic_get_section_contents
void MY_swap_std_reloc_in (bfd *, struct reloc_std_external *, arelent *, asymbol **, bfd_size_type);
void MY_swap_std_reloc_out (bfd *, arelent *, struct reloc_std_external *);
#include "aoutx.h"
void
MY_swap_std_reloc_in (bfd *abfd,
struct reloc_std_external *bytes,
arelent *cache_ptr,
asymbol **symbols,
bfd_size_type symcount ATTRIBUTE_UNUSED)
{
int r_index;
int r_extern;
int r_pcrel;
struct aoutdata *su = &(abfd->tdata.aout_data->a);
cache_ptr->address = H_GET_32 (abfd, bytes->r_address);
cache_ptr->howto = MY_reloc_howto (abfd, bytes, r_index, r_extern, r_pcrel);
MOVE_ADDRESS (0);
}
void
MY_swap_std_reloc_out (bfd *abfd,
arelent *g,
struct reloc_std_external *natptr)
{
int r_index;
asymbol *sym = *(g->sym_ptr_ptr);
int r_extern;
int r_length;
int r_pcrel;
int r_neg = 0; /* Negative relocs use the BASEREL bit. */
asection *output_section = sym->section->output_section;
PUT_WORD (abfd, g->address, natptr->r_address);
r_length = g->howto->size ; /* Size as a power of two. */
if (r_length < 0)
{
r_length = -r_length;
r_neg = 1;
}
r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */
/* For RISC iX, in pc-relative relocs the r_pcrel bit means that the
relocation has been done already (Only for the 26-bit one I think). */
if (g->howto->type == 3)
{
r_length = 3;
r_pcrel = 0;
}
else if (g->howto->type == 7)
{
r_length = 3;
r_pcrel = 1;
}
/* Name was clobbered by aout_write_syms to be symbol index. */
/* If this relocation is relative to a symbol then set the
r_index to the symbols index, and the r_extern bit.
Absolute symbols can come in in two ways, either as an offset
from the abs section, or as a symbol which has an abs value.
check for that here. */
if (bfd_is_com_section (output_section)
|| bfd_is_abs_section (output_section)
|| bfd_is_und_section (output_section))
{
if (bfd_abs_section_ptr->symbol == sym)
{
/* 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,
};
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