526 lines
15 KiB
C
526 lines
15 KiB
C
/* Generic target-file-type support for the BFD library.
|
|
Copyright (C) 1990-1991 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/* $Id$ */
|
|
|
|
#include "bfd.h"
|
|
#include "sysdep.h"
|
|
#include "libbfd.h"
|
|
|
|
/*
|
|
SECTION
|
|
Targets
|
|
|
|
DESCRIPTION
|
|
Each port of BFD to a different machine requries the creation
|
|
of a target back end. All the back end provides to the root
|
|
part of BFD is a structure containing pointers to functions
|
|
which perform certain low level operations on files. BFD
|
|
translates the applications's requests through a pointer into
|
|
calls to the back end routines.
|
|
|
|
When a file is opened with <<bfd_openr>>, its format and
|
|
target are unknown. BFD uses various mechanisms to determine
|
|
how to interpret the file. The operations performed are:
|
|
|
|
o First a BFD is created by calling the internal routine
|
|
<<new_bfd>>, then <<bfd_find_target>> is called with the
|
|
target string supplied to <<bfd_openr>> and the new BFD pointer.
|
|
|
|
o If a null target string was provided to <<bfd_find_target>>,
|
|
it looks up the environment variable <<GNUTARGET>> and uses
|
|
that as the target string.
|
|
|
|
o If the target string is still NULL, or the target string is
|
|
<<default>>, then the first item in the target vector is used
|
|
as the target type. @xref{bfd_target}.
|
|
|
|
o Otherwise, the elements in the target vector are inspected
|
|
one by one, until a match on target name is found. When found,
|
|
that is used.
|
|
|
|
o Otherwise the error <<invalid_target>> is returned to
|
|
<<bfd_openr>>.
|
|
|
|
o <<bfd_openr>> attempts to open the file using
|
|
<<bfd_open_file>>, and returns the BFD.
|
|
|
|
Once the BFD has been opened and the target selected, the file
|
|
format may be determined. This is done by calling
|
|
<<bfd_check_format>> on the BFD with a suggested format. The
|
|
routine returns <<true>> when the application guesses right.
|
|
@menu
|
|
@* bfd_target::
|
|
@end menu
|
|
*/
|
|
|
|
|
|
/*
|
|
|
|
INODE
|
|
bfd_target, , Targets, Targets
|
|
|
|
SUBSECTION
|
|
bfd_target
|
|
|
|
DESCRIPTION
|
|
This structure contains everything that BFD knows about a
|
|
target. It includes things like its byte order, name, what
|
|
routines to call to do various operations, etc.
|
|
|
|
Every BFD points to a target structure with its <<xvec>>
|
|
member.
|
|
|
|
Shortcut for declaring fields which are prototyped function
|
|
pointers, while avoiding anguish on compilers that don't
|
|
support protos.
|
|
|
|
.#define SDEF(ret, name, arglist) \
|
|
. PROTO(ret,(*name),arglist)
|
|
.#define SDEF_FMT(ret, name, arglist) \
|
|
. PROTO(ret,(*name[bfd_type_end]),arglist)
|
|
|
|
These macros are used to dispatch to functions through the
|
|
bfd_target vector. They are used in a number of macros further
|
|
down in @file{bfd.h}, and are also used when calling various
|
|
routines by hand inside the BFD implementation. The "arglist"
|
|
argument must be parenthesized; it contains all the arguments
|
|
to the called function.
|
|
|
|
|
|
.#define BFD_SEND(bfd, message, arglist) \
|
|
. ((*((bfd)->xvec->message)) arglist)
|
|
|
|
For operations which index on the BFD format
|
|
|
|
.#define BFD_SEND_FMT(bfd, message, arglist) \
|
|
. (((bfd)->xvec->message[(int)((bfd)->format)]) arglist)
|
|
|
|
This is the struct which defines the type of BFD this is. The
|
|
<<xvec>> member of the struct <<bfd>> itself points here. Each
|
|
module that implements access to a different target under BFD,
|
|
defines one of these.
|
|
|
|
|
|
FIXME, these names should be rationalised with the names of
|
|
the entry points which call them. Too bad we can't have one
|
|
macro to define them both!
|
|
|
|
.typedef struct bfd_target
|
|
.{
|
|
|
|
identifies the kind of target, eg SunOS4, Ultrix, etc
|
|
|
|
. char *name;
|
|
|
|
The "flavour" of a back end is a general indication about the contents
|
|
of a file.
|
|
|
|
. enum target_flavour {
|
|
. bfd_target_unknown_flavour,
|
|
. bfd_target_aout_flavour,
|
|
. bfd_target_coff_flavour,
|
|
. bfd_target_elf_flavour,
|
|
. bfd_target_ieee_flavour,
|
|
. bfd_target_oasys_flavour,
|
|
. bfd_target_srec_flavour} flavour;
|
|
|
|
The order of bytes within the data area of a file.
|
|
|
|
. boolean byteorder_big_p;
|
|
|
|
The order of bytes within the header parts of a file.
|
|
|
|
. boolean header_byteorder_big_p;
|
|
|
|
This is a mask of all the flags which an executable may have set -
|
|
from the set <<NO_FLAGS>>, <<HAS_RELOC>>, ...<<D_PAGED>>.
|
|
|
|
. flagword object_flags;
|
|
|
|
This is a mask of all the flags which a section may have set - from
|
|
the set <<SEC_NO_FLAGS>>, <<SEC_ALLOC>>, ...<<SET_NEVER_LOAD>>.
|
|
|
|
. flagword section_flags;
|
|
|
|
The pad character for filenames within an archive header.
|
|
|
|
. char ar_pad_char;
|
|
|
|
The maximum number of characters in an archive header.
|
|
|
|
. unsigned short ar_max_namelen;
|
|
|
|
The minimum alignment restriction for any section.
|
|
|
|
. unsigned int align_power_min;
|
|
|
|
Entries for byte swapping for data. These are different to the other
|
|
entry points, since they don't take BFD as first arg. Certain other handlers
|
|
could do the same.
|
|
|
|
. SDEF (bfd_vma, bfd_getx64, (bfd_byte *));
|
|
. SDEF (void, bfd_putx64, (bfd_vma, bfd_byte *));
|
|
. SDEF (bfd_vma, bfd_getx32, (bfd_byte *));
|
|
. SDEF (void, bfd_putx32, (bfd_vma, bfd_byte *));
|
|
. SDEF (bfd_vma, bfd_getx16, (bfd_byte *));
|
|
. SDEF (void, bfd_putx16, (bfd_vma, bfd_byte *));
|
|
|
|
Byte swapping for the headers
|
|
|
|
. SDEF (bfd_vma, bfd_h_getx64, (bfd_byte *));
|
|
. SDEF (void, bfd_h_putx64, (bfd_vma, bfd_byte *));
|
|
. SDEF (bfd_vma, bfd_h_getx32, (bfd_byte *));
|
|
. SDEF (void, bfd_h_putx32, (bfd_vma, bfd_byte *));
|
|
. SDEF (bfd_vma, bfd_h_getx16, (bfd_byte *));
|
|
. SDEF (void, bfd_h_putx16, (bfd_vma, bfd_byte *));
|
|
|
|
Format dependent routines, these turn into vectors of entry points
|
|
within the target vector structure; one for each format to check.
|
|
|
|
Check the format of a file being read. Return bfd_target * or zero.
|
|
|
|
. SDEF_FMT (struct bfd_target *, _bfd_check_format, (bfd *));
|
|
|
|
Set the format of a file being written.
|
|
|
|
. SDEF_FMT (boolean, _bfd_set_format, (bfd *));
|
|
|
|
Write cached information into a file being written, at bfd_close.
|
|
|
|
. SDEF_FMT (boolean, _bfd_write_contents, (bfd *));
|
|
|
|
The following functions are defined in <<JUMP_TABLE>>. The idea is
|
|
that the back end writer of <<foo>> names all the routines
|
|
<<foo_>>@var{entry_point}, <<JUMP_TABLE>> will built the entries
|
|
in this structure in the right order.
|
|
|
|
Core file entry points
|
|
|
|
. SDEF (char *, _core_file_failing_command, (bfd *));
|
|
. SDEF (int, _core_file_failing_signal, (bfd *));
|
|
. SDEF (boolean, _core_file_matches_executable_p, (bfd *, bfd *));
|
|
|
|
Archive entry points
|
|
|
|
. SDEF (boolean, _bfd_slurp_armap, (bfd *));
|
|
. SDEF (boolean, _bfd_slurp_extended_name_table, (bfd *));
|
|
. SDEF (void, _bfd_truncate_arname, (bfd *, CONST char *, char *));
|
|
. SDEF (boolean, write_armap, (bfd *arch,
|
|
. unsigned int elength,
|
|
. struct orl *map,
|
|
. unsigned int orl_count,
|
|
. int stridx));
|
|
|
|
Standard stuff.
|
|
|
|
. SDEF (boolean, _close_and_cleanup, (bfd *));
|
|
. SDEF (boolean, _bfd_set_section_contents, (bfd *, sec_ptr, PTR,
|
|
. file_ptr, bfd_size_type));
|
|
. SDEF (boolean, _bfd_get_section_contents, (bfd *, sec_ptr, PTR,
|
|
. file_ptr, bfd_size_type));
|
|
. SDEF (boolean, _new_section_hook, (bfd *, sec_ptr));
|
|
|
|
Symbols and reloctions
|
|
|
|
. SDEF (unsigned int, _get_symtab_upper_bound, (bfd *));
|
|
. SDEF (unsigned int, _bfd_canonicalize_symtab,
|
|
. (bfd *, struct symbol_cache_entry **));
|
|
. SDEF (unsigned int, _get_reloc_upper_bound, (bfd *, sec_ptr));
|
|
. SDEF (unsigned int, _bfd_canonicalize_reloc, (bfd *, sec_ptr, arelent **,
|
|
. struct symbol_cache_entry**));
|
|
. SDEF (struct symbol_cache_entry *, _bfd_make_empty_symbol, (bfd *));
|
|
. SDEF (void, _bfd_print_symbol, (bfd *, PTR, struct symbol_cache_entry *,
|
|
. bfd_print_symbol_type));
|
|
.#define bfd_print_symbol(b,p,s,e) BFD_SEND(b, _bfd_print_symbol, (b,p,s,e))
|
|
. SDEF (alent *, _get_lineno, (bfd *, struct symbol_cache_entry *));
|
|
.
|
|
. SDEF (boolean, _bfd_set_arch_mach, (bfd *, enum bfd_architecture,
|
|
. unsigned long));
|
|
.
|
|
. SDEF (bfd *, openr_next_archived_file, (bfd *arch, bfd *prev));
|
|
. SDEF (boolean, _bfd_find_nearest_line,
|
|
. (bfd *abfd, struct sec *section,
|
|
. struct symbol_cache_entry **symbols,bfd_vma offset,
|
|
. CONST char **file, CONST char **func, unsigned int *line));
|
|
. SDEF (int, _bfd_stat_arch_elt, (bfd *, struct stat *));
|
|
.
|
|
. SDEF (int, _bfd_sizeof_headers, (bfd *, boolean));
|
|
.
|
|
. SDEF (void, _bfd_debug_info_start, (bfd *));
|
|
. SDEF (void, _bfd_debug_info_end, (bfd *));
|
|
. SDEF (void, _bfd_debug_info_accumulate, (bfd *, struct sec *));
|
|
. SDEF (bfd_byte *, _bfd_get_relocated_section_contents, (bfd*,struct bfd_seclet_struct *));
|
|
|
|
Special entry points for gdb to swap in coff symbol table parts
|
|
|
|
. SDEF(void, _bfd_coff_swap_aux_in,(
|
|
. bfd *abfd ,
|
|
. PTR ext,
|
|
. int type,
|
|
. int class ,
|
|
. PTR in));
|
|
.
|
|
. SDEF(void, _bfd_coff_swap_sym_in,(
|
|
. bfd *abfd ,
|
|
. PTR ext,
|
|
. PTR in));
|
|
.
|
|
. SDEF(void, _bfd_coff_swap_lineno_in, (
|
|
. bfd *abfd,
|
|
. PTR ext,
|
|
. PTR in));
|
|
.
|
|
|
|
Special entry points for gas to swap coff parts
|
|
|
|
. SDEF(unsigned int, _bfd_coff_swap_aux_out,(
|
|
. bfd *abfd,
|
|
. PTR in,
|
|
. int type,
|
|
. int class,
|
|
. PTR ext));
|
|
.
|
|
. SDEF(unsigned int, _bfd_coff_swap_sym_out,(
|
|
. bfd *abfd,
|
|
. PTR in,
|
|
. PTR ext));
|
|
.
|
|
. SDEF(unsigned int, _bfd_coff_swap_lineno_out,(
|
|
. bfd *abfd,
|
|
. PTR in,
|
|
. PTR ext));
|
|
.
|
|
. SDEF(unsigned int, _bfd_coff_swap_reloc_out,(
|
|
. bfd *abfd,
|
|
. PTR src,
|
|
. PTR dst));
|
|
.
|
|
. SDEF(unsigned int, _bfd_coff_swap_filehdr_out,(
|
|
. bfd *abfd,
|
|
. PTR in,
|
|
. PTR out));
|
|
.
|
|
. SDEF(unsigned int, _bfd_coff_swap_aouthdr_out,(
|
|
. bfd *abfd,
|
|
. PTR in,
|
|
. PTR out));
|
|
.
|
|
. SDEF(unsigned int, _bfd_coff_swap_scnhdr_out,(
|
|
. bfd *abfd,
|
|
. PTR in,
|
|
. PTR out));
|
|
.
|
|
.} bfd_target;
|
|
|
|
*/
|
|
|
|
/* The default is to define a target_vector containing all the targets.
|
|
By setting MINIMIZE=1 on the "make" command line, the user can change this
|
|
to a vector containing just DEFAULT_VECTOR and any required
|
|
traditional-core-file handler. (This is to save space in the executables.)
|
|
The config files can also override the default large vector by giving an
|
|
explicit SELECT_VECS macro. */
|
|
|
|
#if MINIMIZE && defined(DEFAULT_VECTOR) && !defined(SELECT_VECS)
|
|
#ifdef TRAD_CORE
|
|
#define SELECT_VECS &DEFAULT_VECTOR,&trad_core_vec
|
|
#else
|
|
#define SELECT_VECS &DEFAULT_VECTOR
|
|
#endif
|
|
#endif
|
|
|
|
/* All known xvecs. They are listed a second time below, since
|
|
we can't intermix extern's and initializers. */
|
|
extern bfd_target ecoff_little_vec;
|
|
extern bfd_target ecoff_big_vec;
|
|
extern bfd_target sunos_big_vec;
|
|
extern bfd_target demo_64_vec;
|
|
extern bfd_target srec_vec;
|
|
extern bfd_target b_out_vec_little_host;
|
|
extern bfd_target b_out_vec_big_host;
|
|
extern bfd_target icoff_little_vec;
|
|
extern bfd_target icoff_big_vec;
|
|
extern bfd_target elf_little_vec;
|
|
extern bfd_target elf_big_vec;
|
|
extern bfd_target ieee_vec;
|
|
extern bfd_target oasys_vec;
|
|
extern bfd_target m88kbcs_vec;
|
|
extern bfd_target m68kcoff_vec;
|
|
extern bfd_target i386coff_vec;
|
|
extern bfd_target i386aout_vec;
|
|
extern bfd_target a29kcoff_big_vec;
|
|
extern bfd_target trad_core_vec;
|
|
extern bfd_target rs6000coff_vec;
|
|
extern bfd_target h8300coff_vec;
|
|
|
|
#ifdef DEFAULT_VECTOR
|
|
extern bfd_target DEFAULT_VECTOR;
|
|
#endif
|
|
|
|
#ifdef SELECT_VECS
|
|
|
|
bfd_target *target_vector[] = {
|
|
SELECT_VECS,
|
|
0
|
|
};
|
|
|
|
#else
|
|
|
|
bfd_target *target_vector[] = {
|
|
|
|
#ifdef DEFAULT_VECTOR
|
|
&DEFAULT_VECTOR,
|
|
#endif
|
|
|
|
&i386coff_vec,
|
|
&i386aout_vec,
|
|
&ecoff_little_vec,
|
|
&ecoff_big_vec,
|
|
&ieee_vec,
|
|
#if 0
|
|
/* We have no oasys tools anymore, so we can't test any of this
|
|
anymore. If you want to test the stuff yourself, go ahead...
|
|
steve@cygnus.com */
|
|
&oasys_vec,
|
|
#endif
|
|
&sunos_big_vec,
|
|
#ifdef HOST_64_BIT
|
|
&demo_64_vec, /* Only compiled if host has long-long support */
|
|
#endif
|
|
&h8300coff_vec,
|
|
&m88kbcs_vec,
|
|
&srec_vec,
|
|
&icoff_little_vec,
|
|
&icoff_big_vec,
|
|
&elf_little_vec,
|
|
&elf_big_vec,
|
|
&b_out_vec_little_host,
|
|
&b_out_vec_big_host,
|
|
&m68kcoff_vec,
|
|
&a29kcoff_big_vec,
|
|
&rs6000coff_vec,
|
|
|
|
#ifdef TRAD_CORE
|
|
&trad_core_vec,
|
|
#endif
|
|
NULL, /* end of list marker */
|
|
};
|
|
|
|
#endif
|
|
|
|
/* default_vector[0] contains either the address of the default vector,
|
|
if there is one, or zero if there isn't. */
|
|
|
|
bfd_target *default_vector[] = {
|
|
#ifdef DEFAULT_VECTOR
|
|
&DEFAULT_VECTOR,
|
|
#endif
|
|
0,
|
|
};
|
|
|
|
|
|
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_find_target
|
|
|
|
DESCRIPTION
|
|
Returns a pointer to the transfer vector for the object target
|
|
named target_name. If target_name is NULL, chooses the one in
|
|
the environment variable GNUTARGET; if that is null or not
|
|
defined thenthe first entry in the target list is chosen.
|
|
Passing in the string "default" or setting the environment
|
|
variable to "default" will cause the first entry in the target
|
|
list to be returned, and "target_defaulted" will be set in the
|
|
BFD. This causes <<bfd_check_format>> to loop over all the
|
|
targets to find the one that matches the file being read.
|
|
|
|
SYNOPSIS
|
|
bfd_target *bfd_find_target(CONST char *, bfd *);
|
|
*/
|
|
|
|
bfd_target *
|
|
DEFUN(bfd_find_target,(target_name, abfd),
|
|
CONST char *target_name AND
|
|
bfd *abfd)
|
|
{
|
|
bfd_target **target;
|
|
extern char *getenv ();
|
|
CONST char *targname = (target_name ? target_name :
|
|
(CONST char *) getenv ("GNUTARGET"));
|
|
|
|
/* This is safe; the vector cannot be null */
|
|
if (targname == NULL || !strcmp (targname, "default")) {
|
|
abfd->target_defaulted = true;
|
|
return abfd->xvec = target_vector[0];
|
|
}
|
|
|
|
abfd->target_defaulted = false;
|
|
|
|
for (target = &target_vector[0]; *target != NULL; target++) {
|
|
if (!strcmp (targname, (*target)->name))
|
|
return abfd->xvec = *target;
|
|
}
|
|
|
|
bfd_error = invalid_target;
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_target_list
|
|
|
|
DESCRIPTION
|
|
This function returns a freshly malloced NULL-terminated
|
|
vector of the names of all the valid BFD targets. Do not
|
|
modify the names
|
|
|
|
SYNOPSIS
|
|
CONST char **bfd_target_list();
|
|
|
|
*/
|
|
|
|
CONST char **
|
|
DEFUN_VOID(bfd_target_list)
|
|
{
|
|
int vec_length= 0;
|
|
bfd_target **target;
|
|
CONST char **name_list, **name_ptr;
|
|
|
|
for (target = &target_vector[0]; *target != NULL; target++)
|
|
vec_length++;
|
|
|
|
name_ptr =
|
|
name_list = (CONST char **) zalloc ((vec_length + 1) * sizeof (char **));
|
|
|
|
if (name_list == NULL) {
|
|
bfd_error = no_memory;
|
|
return NULL;
|
|
}
|
|
|
|
for (target = &target_vector[0]; *target != NULL; target++)
|
|
*(name_ptr++) = (*target)->name;
|
|
|
|
return name_list;
|
|
}
|