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aoutx.h
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/* BFD semi-generic back-end for a.out binaries.
Copyright (C) 1990-2017 Free Software Foundation, Inc.
Written by Cygnus Support.
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. */
/*
SECTION
a.out backends
DESCRIPTION
BFD supports a number of different flavours of a.out format,
though the major differences are only the sizes of the
structures on disk, and the shape of the relocation
information.
The support is split into a basic support file @file{aoutx.h}
and other files which derive functions from the base. One
derivation file is @file{aoutf1.h} (for a.out flavour 1), and
adds to the basic a.out functions support for sun3, sun4, 386
and 29k a.out files, to create a target jump vector for a
specific target.
This information is further split out into more specific files
for each machine, including @file{sunos.c} for sun3 and sun4,
@file{newsos3.c} for the Sony NEWS, and @file{demo64.c} for a
demonstration of a 64 bit a.out format.
The base file @file{aoutx.h} defines general mechanisms for
reading and writing records to and from disk and various
other methods which BFD requires. It is included by
@file{aout32.c} and @file{aout64.c} to form the names
<<aout_32_swap_exec_header_in>>, <<aout_64_swap_exec_header_in>>, etc.
As an example, this is what goes on to make the back end for a
sun4, from @file{aout32.c}:
| #define ARCH_SIZE 32
| #include "aoutx.h"
Which exports names:
| ...
| aout_32_canonicalize_reloc
| aout_32_find_nearest_line
| aout_32_get_lineno
| aout_32_get_reloc_upper_bound
| ...
from @file{sunos.c}:
| #define TARGET_NAME "a.out-sunos-big"
| #define VECNAME sparc_aout_sunos_be_vec
| #include "aoutf1.h"
requires all the names from @file{aout32.c}, and produces the jump vector
| sparc_aout_sunos_be_vec
The file @file{host-aout.c} is a special case. It is for a large set
of hosts that use ``more or less standard'' a.out files, and
for which cross-debugging is not interesting. It uses the
standard 32-bit a.out support routines, but determines the
file offsets and addresses of the text, data, and BSS
sections, the machine architecture and machine type, and the
entry point address, in a host-dependent manner. Once these
values have been determined, generic code is used to handle
the object file.
When porting it to run on a new system, you must supply:
| HOST_PAGE_SIZE
| HOST_SEGMENT_SIZE
| HOST_MACHINE_ARCH (optional)
| HOST_MACHINE_MACHINE (optional)
| HOST_TEXT_START_ADDR
| HOST_STACK_END_ADDR
in the file @file{../include/sys/h-@var{XXX}.h} (for your host). These
values, plus the structures and macros defined in @file{a.out.h} on
your host system, will produce a BFD target that will access
ordinary a.out files on your host. To configure a new machine
to use @file{host-aout.c}, specify:
| TDEFAULTS = -DDEFAULT_VECTOR=host_aout_big_vec
| TDEPFILES= host-aout.o trad-core.o
in the @file{config/@var{XXX}.mt} file, and modify @file{configure.ac}
to use the
@file{@var{XXX}.mt} file (by setting "<<bfd_target=XXX>>") when your
configuration is selected. */
/* Some assumptions:
* Any BFD with D_PAGED set is ZMAGIC, and vice versa.
Doesn't matter what the setting of WP_TEXT is on output, but it'll
get set on input.
* Any BFD with D_PAGED clear and WP_TEXT set is NMAGIC.
* Any BFD with both flags clear is OMAGIC.
(Just want to make these explicit, so the conditions tested in this
file make sense if you're more familiar with a.out than with BFD.) */
#define KEEPIT udata.i
#include "sysdep.h"
#include "bfd.h"
#include "safe-ctype.h"
#include "bfdlink.h"
#include "libaout.h"
#include "libbfd.h"
#include "aout/aout64.h"
#include "aout/stab_gnu.h"
#include "aout/ar.h"
/*
SUBSECTION
Relocations
DESCRIPTION
The file @file{aoutx.h} provides for both the @emph{standard}
and @emph{extended} forms of a.out relocation records.
The standard records contain only an
address, a symbol index, and a type field. The extended records
(used on 29ks and sparcs) also have a full integer for an
addend. */
#ifndef CTOR_TABLE_RELOC_HOWTO
#define CTOR_TABLE_RELOC_IDX 2
#define CTOR_TABLE_RELOC_HOWTO(BFD) \
((obj_reloc_entry_size (BFD) == RELOC_EXT_SIZE \
? howto_table_ext : howto_table_std) \
+ CTOR_TABLE_RELOC_IDX)
#endif
#ifndef MY_swap_std_reloc_in
#define MY_swap_std_reloc_in NAME (aout, swap_std_reloc_in)
#endif
#ifndef MY_swap_ext_reloc_in
#define MY_swap_ext_reloc_in NAME (aout, swap_ext_reloc_in)
#endif
#ifndef MY_swap_std_reloc_out
#define MY_swap_std_reloc_out NAME (aout, swap_std_reloc_out)
#endif
#ifndef MY_swap_ext_reloc_out
#define MY_swap_ext_reloc_out NAME (aout, swap_ext_reloc_out)
#endif
#ifndef MY_final_link_relocate
#define MY_final_link_relocate _bfd_final_link_relocate
#endif
#ifndef MY_relocate_contents
#define MY_relocate_contents _bfd_relocate_contents
#endif
#define howto_table_ext NAME (aout, ext_howto_table)
#define howto_table_std NAME (aout, std_howto_table)
reloc_howto_type howto_table_ext[] =
{
/* Type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone. */
HOWTO (RELOC_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "8", FALSE, 0, 0x000000ff, FALSE),
HOWTO (RELOC_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 0, "16", FALSE, 0, 0x0000ffff, FALSE),
HOWTO (RELOC_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "32", FALSE, 0, 0xffffffff, FALSE),
HOWTO (RELOC_DISP8, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0, "DISP8", FALSE, 0, 0x000000ff, FALSE),
HOWTO (RELOC_DISP16, 0, 1, 16, TRUE, 0, complain_overflow_signed, 0, "DISP16", FALSE, 0, 0x0000ffff, FALSE),
HOWTO (RELOC_DISP32, 0, 2, 32, TRUE, 0, complain_overflow_signed, 0, "DISP32", FALSE, 0, 0xffffffff, FALSE),
HOWTO (RELOC_WDISP30, 2, 2, 30, TRUE, 0, complain_overflow_signed, 0, "WDISP30", FALSE, 0, 0x3fffffff, FALSE),
HOWTO (RELOC_WDISP22, 2, 2, 22, TRUE, 0, complain_overflow_signed, 0, "WDISP22", FALSE, 0, 0x003fffff, FALSE),
HOWTO (RELOC_HI22, 10, 2, 22, FALSE, 0, complain_overflow_bitfield, 0, "HI22", FALSE, 0, 0x003fffff, FALSE),
HOWTO (RELOC_22, 0, 2, 22, FALSE, 0, complain_overflow_bitfield, 0, "22", FALSE, 0, 0x003fffff, FALSE),
HOWTO (RELOC_13, 0, 2, 13, FALSE, 0, complain_overflow_bitfield, 0, "13", FALSE, 0, 0x00001fff, FALSE),
HOWTO (RELOC_LO10, 0, 2, 10, FALSE, 0, complain_overflow_dont, 0, "LO10", FALSE, 0, 0x000003ff, FALSE),
HOWTO (RELOC_SFA_BASE,0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "SFA_BASE", FALSE, 0, 0xffffffff, FALSE),
HOWTO (RELOC_SFA_OFF13,0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "SFA_OFF13", FALSE, 0, 0xffffffff, FALSE),
HOWTO (RELOC_BASE10, 0, 2, 10, FALSE, 0, complain_overflow_dont, 0, "BASE10", FALSE, 0, 0x000003ff, FALSE),
HOWTO (RELOC_BASE13, 0, 2, 13, FALSE, 0, complain_overflow_signed, 0, "BASE13", FALSE, 0, 0x00001fff, FALSE),
HOWTO (RELOC_BASE22, 10, 2, 22, FALSE, 0, complain_overflow_bitfield, 0, "BASE22", FALSE, 0, 0x003fffff, FALSE),
HOWTO (RELOC_PC10, 0, 2, 10, TRUE, 0, complain_overflow_dont, 0, "PC10", FALSE, 0, 0x000003ff, TRUE),
HOWTO (RELOC_PC22, 10, 2, 22, TRUE, 0, complain_overflow_signed, 0, "PC22", FALSE, 0, 0x003fffff, TRUE),
HOWTO (RELOC_JMP_TBL, 2, 2, 30, TRUE, 0, complain_overflow_signed, 0, "JMP_TBL", FALSE, 0, 0x3fffffff, FALSE),
HOWTO (RELOC_SEGOFF16,0, 2, 0, FALSE, 0, complain_overflow_bitfield, 0, "SEGOFF16", FALSE, 0, 0x00000000, FALSE),
HOWTO (RELOC_GLOB_DAT,0, 2, 0, FALSE, 0, complain_overflow_bitfield, 0, "GLOB_DAT", FALSE, 0, 0x00000000, FALSE),
HOWTO (RELOC_JMP_SLOT,0, 2, 0, FALSE, 0, complain_overflow_bitfield, 0, "JMP_SLOT", FALSE, 0, 0x00000000, FALSE),
HOWTO (RELOC_RELATIVE,0, 2, 0, FALSE, 0, complain_overflow_bitfield, 0, "RELATIVE", FALSE, 0, 0x00000000, FALSE),
HOWTO (0, 0, 3, 0, FALSE, 0, complain_overflow_dont, 0, "R_SPARC_NONE",FALSE, 0, 0x00000000, TRUE),
HOWTO (0, 0, 3, 0, FALSE, 0, complain_overflow_dont, 0, "R_SPARC_NONE",FALSE, 0, 0x00000000, TRUE),
#define RELOC_SPARC_REV32 RELOC_WDISP19
HOWTO (RELOC_SPARC_REV32, 0, 2, 32, FALSE, 0, complain_overflow_dont, 0,"R_SPARC_REV32",FALSE, 0, 0xffffffff, FALSE),
};
/* Convert standard reloc records to "arelent" format (incl byte swap). */
reloc_howto_type howto_table_std[] =
{
/* 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, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,0,"64", TRUE, 0xdeaddead,0xdeaddead, FALSE),
HOWTO ( 4, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0,"DISP8", TRUE, 0x000000ff,0x000000ff, FALSE),
HOWTO ( 5, 0, 1, 16, TRUE, 0, complain_overflow_signed, 0,"DISP16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
HOWTO ( 6, 0, 2, 32, TRUE, 0, complain_overflow_signed, 0,"DISP32", TRUE, 0xffffffff,0xffffffff, FALSE),
HOWTO ( 7, 0, 4, 64, TRUE, 0, complain_overflow_signed, 0,"DISP64", TRUE, 0xfeedface,0xfeedface, FALSE),
HOWTO ( 8, 0, 2, 0, FALSE, 0, complain_overflow_bitfield,0,"GOT_REL", FALSE, 0,0x00000000, FALSE),
HOWTO ( 9, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,0,"BASE16", FALSE,0xffffffff,0xffffffff, FALSE),
HOWTO (10, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,0,"BASE32", FALSE,0xffffffff,0xffffffff, FALSE),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
HOWTO (16, 0, 2, 0, FALSE, 0, complain_overflow_bitfield,0,"JMP_TABLE", FALSE, 0,0x00000000, FALSE),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
HOWTO (32, 0, 2, 0, FALSE, 0, complain_overflow_bitfield,0,"RELATIVE", FALSE, 0,0x00000000, FALSE),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
EMPTY_HOWTO (-1),
HOWTO (40, 0, 2, 0, FALSE, 0, complain_overflow_bitfield,0,"BASEREL", FALSE, 0,0x00000000, FALSE),
};
#define TABLE_SIZE(TABLE) (sizeof (TABLE) / sizeof (TABLE[0]))
reloc_howto_type *
NAME (aout, reloc_type_lookup) (bfd *abfd, bfd_reloc_code_real_type code)
{
#define EXT(i, j) case i: return & howto_table_ext [j]
#define STD(i, j) case i: return & howto_table_std [j]
int ext = obj_reloc_entry_size (abfd) == RELOC_EXT_SIZE;
if (code == BFD_RELOC_CTOR)
switch (bfd_arch_bits_per_address (abfd))
{
case 32:
code = BFD_RELOC_32;
break;
case 64:
code = BFD_RELOC_64;
break;
}
if (ext)
switch (code)
{
EXT (BFD_RELOC_8, 0);
EXT (BFD_RELOC_16, 1);
EXT (BFD_RELOC_32, 2);
EXT (BFD_RELOC_HI22, 8);
EXT (BFD_RELOC_LO10, 11);
EXT (BFD_RELOC_32_PCREL_S2, 6);
EXT (BFD_RELOC_SPARC_WDISP22, 7);
EXT (BFD_RELOC_SPARC13, 10);
EXT (BFD_RELOC_SPARC_GOT10, 14);
EXT (BFD_RELOC_SPARC_BASE13, 15);
EXT (BFD_RELOC_SPARC_GOT13, 15);
EXT (BFD_RELOC_SPARC_GOT22, 16);
EXT (BFD_RELOC_SPARC_PC10, 17);
EXT (BFD_RELOC_SPARC_PC22, 18);
EXT (BFD_RELOC_SPARC_WPLT30, 19);
EXT (BFD_RELOC_SPARC_REV32, 26);
default:
return NULL;
}
else
/* std relocs. */
switch (code)
{
STD (BFD_RELOC_8, 0);
STD (BFD_RELOC_16, 1);
STD (BFD_RELOC_32, 2);
STD (BFD_RELOC_8_PCREL, 4);
STD (BFD_RELOC_16_PCREL, 5);
STD (BFD_RELOC_32_PCREL, 6);
STD (BFD_RELOC_16_BASEREL, 9);
STD (BFD_RELOC_32_BASEREL, 10);
default:
return NULL;
}
}
reloc_howto_type *
NAME (aout, reloc_name_lookup) (bfd *abfd, const char *r_name)
{
unsigned int i, size;
reloc_howto_type *howto_table;
if (obj_reloc_entry_size (abfd) == RELOC_EXT_SIZE)
{
howto_table = howto_table_ext;
size = sizeof (howto_table_ext) / sizeof (howto_table_ext[0]);
}
else
{
howto_table = howto_table_std;
size = sizeof (howto_table_std) / sizeof (howto_table_std[0]);
}
for (i = 0; i < size; i++)
if (howto_table[i].name != NULL
&& strcasecmp (howto_table[i].name, r_name) == 0)
return &howto_table[i];
return NULL;
}
/*
SUBSECTION
Internal entry points
DESCRIPTION
@file{aoutx.h} exports several routines for accessing the
contents of an a.out file, which are gathered and exported in
turn by various format specific files (eg sunos.c).
*/
/*
FUNCTION
aout_@var{size}_swap_exec_header_in
SYNOPSIS
void aout_@var{size}_swap_exec_header_in,
(bfd *abfd,
struct external_exec *bytes,
struct internal_exec *execp);
DESCRIPTION
Swap the information in an executable header @var{raw_bytes} taken
from a raw byte stream memory image into the internal exec header
structure @var{execp}.
*/
#ifndef NAME_swap_exec_header_in
void
NAME (aout, swap_exec_header_in) (bfd *abfd,
struct external_exec *bytes,
struct internal_exec *execp)
{
/* The internal_exec structure has some fields that are unused in this
configuration (IE for i960), so ensure that all such uninitialized
fields are zero'd out. There are places where two of these structs
are memcmp'd, and thus the contents do matter. */
memset ((void *) execp, 0, sizeof (struct internal_exec));
/* Now fill in fields in the execp, from the bytes in the raw data. */
execp->a_info = H_GET_32 (abfd, bytes->e_info);
execp->a_text = GET_WORD (abfd, bytes->e_text);
execp->a_data = GET_WORD (abfd, bytes->e_data);
execp->a_bss = GET_WORD (abfd, bytes->e_bss);
execp->a_syms = GET_WORD (abfd, bytes->e_syms);
execp->a_entry = GET_WORD (abfd, bytes->e_entry);
execp->a_trsize = GET_WORD (abfd, bytes->e_trsize);
execp->a_drsize = GET_WORD (abfd, bytes->e_drsize);
}
#define NAME_swap_exec_header_in NAME (aout, swap_exec_header_in)
#endif
/*
FUNCTION
aout_@var{size}_swap_exec_header_out
SYNOPSIS
void aout_@var{size}_swap_exec_header_out
(bfd *abfd,
struct internal_exec *execp,
struct external_exec *raw_bytes);
DESCRIPTION
Swap the information in an internal exec header structure
@var{execp} into the buffer @var{raw_bytes} ready for writing to disk.
*/
void
NAME (aout, swap_exec_header_out) (bfd *abfd,
struct internal_exec *execp,
struct external_exec *bytes)
{
/* Now fill in fields in the raw data, from the fields in the exec struct. */
H_PUT_32 (abfd, execp->a_info , bytes->e_info);
PUT_WORD (abfd, execp->a_text , bytes->e_text);
PUT_WORD (abfd, execp->a_data , bytes->e_data);
PUT_WORD (abfd, execp->a_bss , bytes->e_bss);
PUT_WORD (abfd, execp->a_syms , bytes->e_syms);
PUT_WORD (abfd, execp->a_entry , bytes->e_entry);
PUT_WORD (abfd, execp->a_trsize, bytes->e_trsize);
PUT_WORD (abfd, execp->a_drsize, bytes->e_drsize);
}
/* Make all the section for an a.out file. */
bfd_boolean
NAME (aout, make_sections) (bfd *abfd)
{
if (obj_textsec (abfd) == NULL && bfd_make_section (abfd, ".text") == NULL)
return FALSE;
if (obj_datasec (abfd) == NULL && bfd_make_section (abfd, ".data") == NULL)
return FALSE;
if (obj_bsssec (abfd) == NULL && bfd_make_section (abfd, ".bss") == NULL)
return FALSE;
return TRUE;
}
/*
FUNCTION
aout_@var{size}_some_aout_object_p
SYNOPSIS
const bfd_target *aout_@var{size}_some_aout_object_p
(bfd *abfd,
struct internal_exec *execp,
const bfd_target *(*callback_to_real_object_p) (bfd *));
DESCRIPTION
Some a.out variant thinks that the file open in @var{abfd}
checking is an a.out file. Do some more checking, and set up
for access if it really is. Call back to the calling
environment's "finish up" function just before returning, to
handle any last-minute setup.
*/
const bfd_target *
NAME (aout, some_aout_object_p) (bfd *abfd,
struct internal_exec *execp,
const bfd_target *(*callback_to_real_object_p) (bfd *))
{
struct aout_data_struct *rawptr, *oldrawptr;
const bfd_target *result;
bfd_size_type amt = sizeof (* rawptr);
rawptr = (struct aout_data_struct *) bfd_zalloc (abfd, amt);
if (rawptr == NULL)
return NULL;
oldrawptr = abfd->tdata.aout_data;
abfd->tdata.aout_data = rawptr;
/* Copy the contents of the old tdata struct.
In particular, we want the subformat, since for hpux it was set in
hp300hpux.c:swap_exec_header_in and will be used in
hp300hpux.c:callback. */
if (oldrawptr != NULL)
*abfd->tdata.aout_data = *oldrawptr;
abfd->tdata.aout_data->a.hdr = &rawptr->e;
/* Copy in the internal_exec struct. */
*(abfd->tdata.aout_data->a.hdr) = *execp;
execp = abfd->tdata.aout_data->a.hdr;
/* Set the file flags. */
abfd->flags = BFD_NO_FLAGS;
if (execp->a_drsize || execp->a_trsize)
abfd->flags |= HAS_RELOC;
/* Setting of EXEC_P has been deferred to the bottom of this function. */
if (execp->a_syms)
abfd->flags |= HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS;
if (N_DYNAMIC (execp))
abfd->flags |= DYNAMIC;
if (N_MAGIC (execp) == ZMAGIC)
{
abfd->flags |= D_PAGED | WP_TEXT;
adata (abfd).magic = z_magic;
}
else if (N_MAGIC (execp) == QMAGIC)
{
abfd->flags |= D_PAGED | WP_TEXT;
adata (abfd).magic = z_magic;
adata (abfd).subformat = q_magic_format;
}
else if (N_MAGIC (execp) == NMAGIC)
{
abfd->flags |= WP_TEXT;
adata (abfd).magic = n_magic;
}
else if (N_MAGIC (execp) == OMAGIC
|| N_MAGIC (execp) == BMAGIC)
adata (abfd).magic = o_magic;
else
/* Should have been checked with N_BADMAG before this routine
was called. */
abort ();
bfd_get_start_address (abfd) = execp->a_entry;
obj_aout_symbols (abfd) = NULL;
bfd_get_symcount (abfd) = execp->a_syms / sizeof (struct external_nlist);
/* The default relocation entry size is that of traditional V7 Unix. */
obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
/* The default symbol entry size is that of traditional Unix. */
obj_symbol_entry_size (abfd) = EXTERNAL_NLIST_SIZE;
#ifdef USE_MMAP
bfd_init_window (&obj_aout_sym_window (abfd));
bfd_init_window (&obj_aout_string_window (abfd));
#endif
obj_aout_external_syms (abfd) = NULL;
obj_aout_external_strings (abfd) = NULL;
obj_aout_sym_hashes (abfd) = NULL;
if (! NAME (aout, make_sections) (abfd))
goto error_ret;
obj_datasec (abfd)->size = execp->a_data;
obj_bsssec (abfd)->size = execp->a_bss;
obj_textsec (abfd)->flags =
(execp->a_trsize != 0
? (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_RELOC)
: (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS));
obj_datasec (abfd)->flags =
(execp->a_drsize != 0
? (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS | SEC_RELOC)
: (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS));
obj_bsssec (abfd)->flags = SEC_ALLOC;
#ifdef THIS_IS_ONLY_DOCUMENTATION
/* The common code can't fill in these things because they depend
on either the start address of the text segment, the rounding
up of virtual addresses between segments, or the starting file
position of the text segment -- all of which varies among different
versions of a.out. */
/* Call back to the format-dependent code to fill in the rest of the
fields and do any further cleanup. Things that should be filled
in by the callback: */
struct exec *execp = exec_hdr (abfd);
obj_textsec (abfd)->size = N_TXTSIZE (execp);
/* Data and bss are already filled in since they're so standard. */
/* The virtual memory addresses of the sections. */
obj_textsec (abfd)->vma = N_TXTADDR (execp);
obj_datasec (abfd)->vma = N_DATADDR (execp);
obj_bsssec (abfd)->vma = N_BSSADDR (execp);
/* The file offsets of the sections. */
obj_textsec (abfd)->filepos = N_TXTOFF (execp);
obj_datasec (abfd)->filepos = N_DATOFF (execp);
/* The file offsets of the relocation info. */
obj_textsec (abfd)->rel_filepos = N_TRELOFF (execp);
obj_datasec (abfd)->rel_filepos = N_DRELOFF (execp);
/* The file offsets of the string table and symbol table. */
obj_str_filepos (abfd) = N_STROFF (execp);
obj_sym_filepos (abfd) = N_SYMOFF (execp);
/* Determine the architecture and machine type of the object file. */
switch (N_MACHTYPE (exec_hdr (abfd)))
{
default:
abfd->obj_arch = bfd_arch_obscure;
break;
}
adata (abfd)->page_size = TARGET_PAGE_SIZE;
adata (abfd)->segment_size = SEGMENT_SIZE;
adata (abfd)->exec_bytes_size = EXEC_BYTES_SIZE;
return abfd->xvec;
/* The architecture is encoded in various ways in various a.out variants,
or is not encoded at all in some of them. The relocation size depends
on the architecture and the a.out variant. Finally, the return value
is the bfd_target vector in use. If an error occurs, return zero and
set bfd_error to the appropriate error code.
Formats such as b.out, which have additional fields in the a.out
header, should cope with them in this callback as well. */
#endif /* DOCUMENTATION */
result = (*callback_to_real_object_p) (abfd);
/* Now that the segment addresses have been worked out, take a better
guess at whether the file is executable. If the entry point
is within the text segment, assume it is. (This makes files
executable even if their entry point address is 0, as long as
their text starts at zero.).
This test had to be changed to deal with systems where the text segment
runs at a different location than the default. The problem is that the
entry address can appear to be outside the text segment, thus causing an
erroneous conclusion that the file isn't executable.
To fix this, we now accept any non-zero entry point as an indication of
executability. This will work most of the time, since only the linker
sets the entry point, and that is likely to be non-zero for most systems. */
if (execp->a_entry != 0
|| (execp->a_entry >= obj_textsec (abfd)->vma
&& execp->a_entry < (obj_textsec (abfd)->vma
+ obj_textsec (abfd)->size)
&& execp->a_trsize == 0
&& execp->a_drsize == 0))
abfd->flags |= EXEC_P;
#ifdef STAT_FOR_EXEC
else
{
struct stat stat_buf;
/* The original heuristic doesn't work in some important cases.
The a.out file has no information about the text start
address. For files (like kernels) linked to non-standard
addresses (ld -Ttext nnn) the entry point may not be between
the default text start (obj_textsec(abfd)->vma) and
(obj_textsec(abfd)->vma) + text size. This is not just a mach
issue. Many kernels are loaded at non standard addresses. */
if (abfd->iostream != NULL
&& (abfd->flags & BFD_IN_MEMORY) == 0
&& (fstat (fileno ((FILE *) (abfd->iostream)), &stat_buf) == 0)
&& ((stat_buf.st_mode & 0111) != 0))
abfd->flags |= EXEC_P;
}
#endif /* STAT_FOR_EXEC */
if (result)
return result;
error_ret:
bfd_release (abfd, rawptr);
abfd->tdata.aout_data = oldrawptr;
return NULL;
}
/*
FUNCTION
aout_@var{size}_mkobject
SYNOPSIS
bfd_boolean aout_@var{size}_mkobject, (bfd *abfd);
DESCRIPTION
Initialize BFD @var{abfd} for use with a.out files.
*/
bfd_boolean
NAME (aout, mkobject) (bfd *abfd)
{
struct aout_data_struct *rawptr;
bfd_size_type amt = sizeof (* rawptr);
bfd_set_error (bfd_error_system_call);
rawptr = (struct aout_data_struct *) bfd_zalloc (abfd, amt);
if (rawptr == NULL)
return FALSE;
abfd->tdata.aout_data = rawptr;
exec_hdr (abfd) = &(rawptr->e);
obj_textsec (abfd) = NULL;
obj_datasec (abfd) = NULL;
obj_bsssec (abfd) = NULL;
return TRUE;
}
/*
FUNCTION
aout_@var{size}_machine_type
SYNOPSIS
enum machine_type aout_@var{size}_machine_type
(enum bfd_architecture arch,
unsigned long machine,
bfd_boolean *unknown);
DESCRIPTION
Keep track of machine architecture and machine type for
a.out's. Return the <<machine_type>> for a particular
architecture and machine, or <<M_UNKNOWN>> if that exact architecture
and machine can't be represented in a.out format.
If the architecture is understood, machine type 0 (default)
is always understood.
*/
enum machine_type
NAME (aout, machine_type) (enum bfd_architecture arch,
unsigned long machine,
bfd_boolean *unknown)
{
enum machine_type arch_flags;
arch_flags = M_UNKNOWN;
*unknown = TRUE;
switch (arch)
{
case bfd_arch_sparc:
if (machine == 0
|| machine == bfd_mach_sparc
|| machine == bfd_mach_sparc_sparclite
|| machine == bfd_mach_sparc_sparclite_le
|| machine == bfd_mach_sparc_v8plus
|| machine == bfd_mach_sparc_v8plusa
|| machine == bfd_mach_sparc_v8plusb
|| machine == bfd_mach_sparc_v8plusc
|| machine == bfd_mach_sparc_v8plusd
|| machine == bfd_mach_sparc_v8pluse
|| machine == bfd_mach_sparc_v8plusv
|| machine == bfd_mach_sparc_v8plusm
|| machine == bfd_mach_sparc_v9
|| machine == bfd_mach_sparc_v9a
|| machine == bfd_mach_sparc_v9b
|| machine == bfd_mach_sparc_v9c
|| machine == bfd_mach_sparc_v9d
|| machine == bfd_mach_sparc_v9e
|| machine == bfd_mach_sparc_v9v
|| machine == bfd_mach_sparc_v9m)
arch_flags = M_SPARC;
else if (machine == bfd_mach_sparc_sparclet)
arch_flags = M_SPARCLET;
break;
case bfd_arch_m68k:
switch (machine)
{
case 0: arch_flags = M_68010; break;
case bfd_mach_m68000: arch_flags = M_UNKNOWN; *unknown = FALSE; break;
case bfd_mach_m68010: arch_flags = M_68010; break;
case bfd_mach_m68020: arch_flags = M_68020; break;
default: arch_flags = M_UNKNOWN; break;
}
break;
case bfd_arch_i386:
if (machine == 0
|| machine == bfd_mach_i386_i386
|| machine == bfd_mach_i386_i386_intel_syntax)
arch_flags = M_386;
break;
case bfd_arch_arm:
if (machine == 0)
arch_flags = M_ARM;
break;
case bfd_arch_mips:
switch (machine)
{
case 0:
case bfd_mach_mips3000:
case bfd_mach_mips3900:
arch_flags = M_MIPS1;
break;
case bfd_mach_mips6000:
arch_flags = M_MIPS2;
break;
case bfd_mach_mips4000:
case bfd_mach_mips4010:
case bfd_mach_mips4100:
case bfd_mach_mips4300:
case bfd_mach_mips4400:
case bfd_mach_mips4600:
case bfd_mach_mips4650:
case bfd_mach_mips8000:
case bfd_mach_mips9000:
case bfd_mach_mips10000:
case bfd_mach_mips12000:
case bfd_mach_mips14000:
case bfd_mach_mips16000:
case bfd_mach_mips16:
case bfd_mach_mipsisa32:
case bfd_mach_mipsisa32r2:
case bfd_mach_mipsisa32r3:
case bfd_mach_mipsisa32r5:
case bfd_mach_mipsisa32r6:
case bfd_mach_mips5:
case bfd_mach_mipsisa64:
case bfd_mach_mipsisa64r2:
case bfd_mach_mipsisa64r3:
case bfd_mach_mipsisa64r5:
case bfd_mach_mipsisa64r6:
case bfd_mach_mips_sb1:
case bfd_mach_mips_xlr:
/* FIXME: These should be MIPS3, MIPS4, MIPS16, MIPS32, etc. */
arch_flags = M_MIPS2;
break;
default:
arch_flags = M_UNKNOWN;
break;
}
break;
case bfd_arch_ns32k:
switch (machine)
{
case 0: arch_flags = M_NS32532; break;
case 32032: arch_flags = M_NS32032; break;
case 32532: arch_flags = M_NS32532; break;
default: arch_flags = M_UNKNOWN; break;
}
break;
case bfd_arch_vax:
*unknown = FALSE;
break;
case bfd_arch_cris:
if (machine == 0 || machine == 255)
arch_flags = M_CRIS;
break;
case bfd_arch_m88k:
*unknown = FALSE;
break;
default:
arch_flags = M_UNKNOWN;
}
if (arch_flags != M_UNKNOWN)
*unknown = FALSE;
return arch_flags;
}
/*
FUNCTION
aout_@var{size}_set_arch_mach
SYNOPSIS
bfd_boolean aout_@var{size}_set_arch_mach,
(bfd *,
enum bfd_architecture arch,
unsigned long machine);
DESCRIPTION
Set the architecture and the machine of the BFD @var{abfd} to the
values @var{arch} and @var{machine}. Verify that @var{abfd}'s format
can support the architecture required.
*/
bfd_boolean
NAME (aout, set_arch_mach) (bfd *abfd,
enum bfd_architecture arch,
unsigned long machine)
{
if (! bfd_default_set_arch_mach (abfd, arch, machine))
return FALSE;
if (arch != bfd_arch_unknown)
{
bfd_boolean unknown;
NAME (aout, machine_type) (arch, machine, &unknown);
if (unknown)
return FALSE;
}
/* Determine the size of a relocation entry. */
switch (arch)
{
case bfd_arch_sparc:
case bfd_arch_mips:
obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
break;
default:
obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
break;
}
return (*aout_backend_info (abfd)->set_sizes) (abfd);
}
static void
adjust_o_magic (bfd *abfd, struct internal_exec *execp)
{
file_ptr pos = adata (abfd).exec_bytes_size;
bfd_vma vma = 0;
int pad = 0;
/* Text. */
obj_textsec (abfd)->filepos = pos;
if (!obj_textsec (abfd)->user_set_vma)
obj_textsec (abfd)->vma = vma;
else
vma = obj_textsec (abfd)->vma;
pos += obj_textsec (abfd)->size;
vma += obj_textsec (abfd)->size;
/* Data. */
if (!obj_datasec (abfd)->user_set_vma)
{
obj_textsec (abfd)->size += pad;
pos += pad;
vma += pad;
obj_datasec (abfd)->vma = vma;
}
else
vma = obj_datasec (abfd)->vma;
obj_datasec (abfd)->filepos = pos;
pos += obj_datasec (abfd)->size;
vma += obj_datasec (abfd)->size;
/* BSS. */
if (!obj_bsssec (abfd)->user_set_vma)
{
obj_datasec (abfd)->size += pad;
pos += pad;
vma += pad;
obj_bsssec (abfd)->vma = vma;
}
else
{
/* The VMA of the .bss section is set by the VMA of the
.data section plus the size of the .data section. We may
need to add padding bytes to make this true. */
pad = obj_bsssec (abfd)->vma - vma;
if (pad > 0)
{
obj_datasec (abfd)->size += pad;
pos += pad;
}
}
obj_bsssec (abfd)->filepos = pos;
/* Fix up the exec header. */
execp->a_text = obj_textsec (abfd)->size;
execp->a_data = obj_datasec (abfd)->size;
execp->a_bss = obj_bsssec (abfd)->size;
N_SET_MAGIC (execp, OMAGIC);
}
static void
adjust_z_magic (bfd *abfd, struct internal_exec *execp)
{
bfd_size_type data_pad, text_pad;
file_ptr text_end;
const struct aout_backend_data *abdp;
/* TRUE if text includes exec header. */
bfd_boolean ztih;
abdp = aout_backend_info (abfd);
/* Text. */
ztih = (abdp != NULL
&& (abdp->text_includes_header
|| obj_aout_subformat (abfd) == q_magic_format));
obj_textsec (abfd)->filepos = (ztih
? adata (abfd).exec_bytes_size
: adata (abfd).zmagic_disk_block_size);
if (! obj_textsec (abfd)->user_set_vma)
{
/* ?? Do we really need to check for relocs here? */
obj_textsec (abfd)->vma = ((abfd->flags & HAS_RELOC)
? 0
: (ztih
? (abdp->default_text_vma
+ adata (abfd).exec_bytes_size)
: abdp->default_text_vma));
text_pad = 0;
}
else
{
/* The .text section is being loaded at an unusual address. We
may need to pad it such that the .data section starts at a page
boundary. */
if (ztih)
text_pad = ((obj_textsec (abfd)->filepos - obj_textsec (abfd)->vma)