bfd.c

来自「基于4个mips核的noc设计」· C语言 代码 · 共 1,238 行 · 第 1/3 页

/* Generic BFD library interface and support routines.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   2000, 2001
   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/*
SECTION
	<<typedef bfd>>

	A BFD has type <<bfd>>; objects of this type are the
	cornerstone of any application using BFD. Using BFD
	consists of making references though the BFD and to data in the BFD.

	Here is the structure that defines the type <<bfd>>.  It
	contains the major data about the file and pointers
	to the rest of the data.

CODE_FRAGMENT
.
.struct _bfd
.{
.    {* The filename the application opened the BFD with.  *}
.    CONST char *filename;
.
.    {* A pointer to the target jump table.             *}
.    const struct bfd_target *xvec;
.
.    {* To avoid dragging too many header files into every file that
.       includes `<<bfd.h>>', IOSTREAM has been declared as a "char
.       *", and MTIME as a "long".  Their correct types, to which they
.       are cast when used, are "FILE *" and "time_t".    The iostream
.       is the result of an fopen on the filename.  However, if the
.       BFD_IN_MEMORY flag is set, then iostream is actually a pointer
.       to a bfd_in_memory struct.  *}
.    PTR iostream;
.
.    {* Is the file descriptor being cached?  That is, can it be closed as
.       needed, and re-opened when accessed later?  *}
.
.    boolean cacheable;
.
.    {* Marks whether there was a default target specified when the
.       BFD was opened. This is used to select which matching algorithm
.       to use to choose the back end. *}
.
.    boolean target_defaulted;
.
.    {* The caching routines use these to maintain a
.       least-recently-used list of BFDs *}
.
.    struct _bfd *lru_prev, *lru_next;
.
.    {* When a file is closed by the caching routines, BFD retains
.       state information on the file here: *}
.
.    file_ptr where;
.
.    {* and here: (``once'' means at least once) *}
.
.    boolean opened_once;
.
.    {* Set if we have a locally maintained mtime value, rather than
.       getting it from the file each time: *}
.
.    boolean mtime_set;
.
.    {* File modified time, if mtime_set is true: *}
.
.    long mtime;
.
.    {* Reserved for an unimplemented file locking extension.*}
.
.    int ifd;
.
.    {* The format which belongs to the BFD. (object, core, etc.) *}
.
.    bfd_format format;
.
.    {* The direction the BFD was opened with*}
.
.    enum bfd_direction {no_direction = 0,
.                        read_direction = 1,
.                        write_direction = 2,
.                        both_direction = 3} direction;
.
.    {* Format_specific flags*}
.
.    flagword flags;
.
.    {* Currently my_archive is tested before adding origin to
.       anything. I believe that this can become always an add of
.       origin, with origin set to 0 for non archive files.   *}
.
.    file_ptr origin;
.
.    {* Remember when output has begun, to stop strange things
.       from happening. *}
.    boolean output_has_begun;
.
.    {* Pointer to linked list of sections*}
.    struct sec  *sections;
.
.    {* The number of sections *}
.    unsigned int section_count;
.
.    {* Stuff only useful for object files:
.       The start address. *}
.    bfd_vma start_address;
.
.    {* Used for input and output*}
.    unsigned int symcount;
.
.    {* Symbol table for output BFD (with symcount entries) *}
.    struct symbol_cache_entry  **outsymbols;
.
.    {* Pointer to structure which contains architecture information*}
.    const struct bfd_arch_info *arch_info;
.
.    {* Stuff only useful for archives:*}
.    PTR arelt_data;
.    struct _bfd *my_archive;     {* The containing archive BFD.  *}
.    struct _bfd *next;           {* The next BFD in the archive.  *}
.    struct _bfd *archive_head;   {* The first BFD in the archive.  *}
.    boolean has_armap;
.
.    {* A chain of BFD structures involved in a link.  *}
.    struct _bfd *link_next;
.
.    {* A field used by _bfd_generic_link_add_archive_symbols.  This will
.       be used only for archive elements.  *}
.    int archive_pass;
.
.    {* Used by the back end to hold private data. *}
.
.    union
.      {
.      struct aout_data_struct *aout_data;
.      struct artdata *aout_ar_data;
.      struct _oasys_data *oasys_obj_data;
.      struct _oasys_ar_data *oasys_ar_data;
.      struct coff_tdata *coff_obj_data;
.      struct pe_tdata *pe_obj_data;
.      struct xcoff_tdata *xcoff_obj_data;
.      struct ecoff_tdata *ecoff_obj_data;
.      struct ieee_data_struct *ieee_data;
.      struct ieee_ar_data_struct *ieee_ar_data;
.      struct srec_data_struct *srec_data;
.      struct ihex_data_struct *ihex_data;
.      struct tekhex_data_struct *tekhex_data;
.      struct elf_obj_tdata *elf_obj_data;
.      struct nlm_obj_tdata *nlm_obj_data;
.      struct bout_data_struct *bout_data;
.      struct sun_core_struct *sun_core_data;
.      struct sco5_core_struct *sco5_core_data;
.      struct trad_core_struct *trad_core_data;
.      struct som_data_struct *som_data;
.      struct hpux_core_struct *hpux_core_data;
.      struct hppabsd_core_struct *hppabsd_core_data;
.      struct sgi_core_struct *sgi_core_data;
.      struct lynx_core_struct *lynx_core_data;
.      struct osf_core_struct *osf_core_data;
.      struct cisco_core_struct *cisco_core_data;
.      struct versados_data_struct *versados_data;
.      struct netbsd_core_struct *netbsd_core_data;
.      PTR any;
.      } tdata;
.
.    {* Used by the application to hold private data*}
.    PTR usrdata;
.
.  {* Where all the allocated stuff under this BFD goes.  This is a
.     struct objalloc *, but we use PTR to avoid requiring the inclusion of
.     objalloc.h.  *}
.    PTR memory;
.};
.
*/

#include "bfd.h"
#include "sysdep.h"

#ifdef ANSI_PROTOTYPES
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#include "libiberty.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "coff/internal.h"
#include "coff/sym.h"
#include "libcoff.h"
#include "libecoff.h"
#undef obj_symbols
#include "elf-bfd.h"

#include <ctype.h>

/* provide storage for subsystem, stack and heap data which may have been
   passed in on the command line.  Ld puts this data into a bfd_link_info
   struct which ultimately gets passed in to the bfd.  When it arrives, copy
   it to the following struct so that the data will be available in coffcode.h
   where it is needed.  The typedef's used are defined in bfd.h */

/*
SECTION
	Error reporting

	Most BFD functions return nonzero on success (check their
	individual documentation for precise semantics).  On an error,
	they call <<bfd_set_error>> to set an error condition that callers
	can check by calling <<bfd_get_error>>.
        If that returns <<bfd_error_system_call>>, then check
	<<errno>>.

	The easiest way to report a BFD error to the user is to
	use <<bfd_perror>>.

SUBSECTION
	Type <<bfd_error_type>>

	The values returned by <<bfd_get_error>> are defined by the
	enumerated type <<bfd_error_type>>.

CODE_FRAGMENT
.
.typedef enum bfd_error
.{
.  bfd_error_no_error = 0,
.  bfd_error_system_call,
.  bfd_error_invalid_target,
.  bfd_error_wrong_format,
.  bfd_error_invalid_operation,
.  bfd_error_no_memory,
.  bfd_error_no_symbols,
.  bfd_error_no_armap,
.  bfd_error_no_more_archived_files,
.  bfd_error_malformed_archive,
.  bfd_error_file_not_recognized,
.  bfd_error_file_ambiguously_recognized,
.  bfd_error_no_contents,
.  bfd_error_nonrepresentable_section,
.  bfd_error_no_debug_section,
.  bfd_error_bad_value,
.  bfd_error_file_truncated,
.  bfd_error_file_too_big,
.  bfd_error_invalid_error_code
.} bfd_error_type;
.
*/

static bfd_error_type bfd_error = bfd_error_no_error;

CONST char *CONST bfd_errmsgs[] = {
                        N_("No error"),
                        N_("System call error"),
                        N_("Invalid bfd target"),
                        N_("File in wrong format"),
                        N_("Invalid operation"),
                        N_("Memory exhausted"),
                        N_("No symbols"),
			N_("Archive has no index; run ranlib to add one"),
                        N_("No more archived files"),
                        N_("Malformed archive"),
                        N_("File format not recognized"),
                        N_("File format is ambiguous"),
                        N_("Section has no contents"),
                        N_("Nonrepresentable section on output"),
			N_("Symbol needs debug section which does not exist"),
			N_("Bad value"),
			N_("File truncated"),
			N_("File too big"),
                        N_("#<Invalid error code>")
                       };

/*
FUNCTION
	bfd_get_error

SYNOPSIS
	bfd_error_type bfd_get_error (void);

DESCRIPTION
	Return the current BFD error condition.
*/

bfd_error_type
bfd_get_error ()
{
  return bfd_error;
}

/*
FUNCTION
	bfd_set_error

SYNOPSIS
	void bfd_set_error (bfd_error_type error_tag);

DESCRIPTION
	Set the BFD error condition to be @var{error_tag}.
*/

void
bfd_set_error (error_tag)
     bfd_error_type error_tag;
{
  bfd_error = error_tag;
}

/*
FUNCTION
	bfd_errmsg

SYNOPSIS
	CONST char *bfd_errmsg (bfd_error_type error_tag);

DESCRIPTION
	Return a string describing the error @var{error_tag}, or
	the system error if @var{error_tag} is <<bfd_error_system_call>>.
*/

CONST char *
bfd_errmsg (error_tag)
     bfd_error_type error_tag;
{
#ifndef errno
  extern int errno;
#endif
  if (error_tag == bfd_error_system_call)
    return xstrerror (errno);

  if ((((int)error_tag <(int) bfd_error_no_error) ||
       ((int)error_tag > (int)bfd_error_invalid_error_code)))
    error_tag = bfd_error_invalid_error_code;/* sanity check */

  return _(bfd_errmsgs [(int)error_tag]);
}

/*
FUNCTION
	bfd_perror

SYNOPSIS
	void bfd_perror (CONST char *message);

DESCRIPTION
	Print to the standard error stream a string describing the
	last BFD error that occurred, or the last system error if
	the last BFD error was a system call failure.  If @var{message}
	is non-NULL and non-empty, the error string printed is preceded
	by @var{message}, a colon, and a space.  It is followed by a newline.
*/

void
bfd_perror (message)
     CONST char *message;
{
  if (bfd_get_error () == bfd_error_system_call)
    perror((char *)message);            /* must be system error then...  */
  else {
    if (message == NULL || *message == '\0')
      fprintf (stderr, "%s\n", bfd_errmsg (bfd_get_error ()));
    else
      fprintf (stderr, "%s: %s\n", message, bfd_errmsg (bfd_get_error ()));
  }
}

/*
SUBSECTION
	BFD error handler

	Some BFD functions want to print messages describing the
	problem.  They call a BFD error handler function.  This
	function may be overriden by the program.

	The BFD error handler acts like printf.

CODE_FRAGMENT
.
.typedef void (*bfd_error_handler_type) PARAMS ((const char *, ...));
.
*/

/* The program name used when printing BFD error messages.  */

static const char *_bfd_error_program_name;

/* This is the default routine to handle BFD error messages.  */

#ifdef ANSI_PROTOTYPES

static void _bfd_default_error_handler PARAMS ((const char *s, ...));

static void