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/* Generic BFD library interface and support routines.

   Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 97, 98, 1999

   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

_bfd_default_error_handler (const char *s, ...)

{

  va_list p;

  if (_bfd_error_program_name != NULL)

    fprintf (stderr, "%s: ", _bfd_error_program_name);

  else

    fprintf (stderr, "BFD: ");

  va_start (p, s);

  vfprintf (stderr, s, p);

  va_end (p);

  fprintf (stderr, "\n");

}

#else /* ! defined (ANSI_PROTOTYPES) */

static void _bfd_default_error_handler ();

static void

_bfd_default_error_handler (va_alist)

     va_dcl

{

  va_list p;

  const char *s;

  if (_bfd_error_program_name != NULL)

    fprintf (stderr, "%s: ", _bfd_error_program_name);

  else

    fprintf (stderr, "BFD: ");

  va_start (p);

  s = va_arg (p, const char *);

  vfprintf (stderr, s, p);

  va_end (p);

  fprintf (stderr, "\n");

}

#endif /* ! defined (ANSI_PROTOTYPES) */

/* This is a function pointer to the routine which should handle BFD

   error messages.  It is called when a BFD routine encounters an

   error for which it wants to print a message.  Going through a

   function pointer permits a program linked against BFD to intercept

   the messages and deal with them itself.  */

bfd_error_handler_type _bfd_error_handler = _bfd_default_error_handler;

/*

FUNCTION

        bfd_set_error_handler

SYNOPSIS

        bfd_error_handler_type bfd_set_error_handler (bfd_error_handler_type);

DESCRIPTION

        Set the BFD error handler function.  Returns the previous

        function.

*/

bfd_error_handler_type

bfd_set_error_handler (pnew)

     bfd_error_handler_type pnew;

{

  bfd_error_handler_type pold;

  pold = _bfd_error_handler;

  _bfd_error_handler = pnew;

  return pold;

}

/*

FUNCTION

        bfd_set_error_program_name

SYNOPSIS

        void bfd_set_error_program_name (const char *);

DESCRIPTION

        Set the program name to use when printing a BFD error.  This

        is printed before the error message followed by a colon and

        space.  The string must not be changed after it is passed to

        this function.

*/

void

bfd_set_error_program_name (name)

     const char *name;

{

  _bfd_error_program_name = name;

}

/*

FUNCTION

        bfd_get_error_handler

SYNOPSIS

        bfd_error_handler_type bfd_get_error_handler (void);

DESCRIPTION

        Return the BFD error handler function.

*/

bfd_error_handler_type

bfd_get_error_handler ()

{

  return _bfd_error_handler;

}

/*

SECTION

        Symbols

*/

/*

FUNCTION

        bfd_get_reloc_upper_bound

SYNOPSIS

        long bfd_get_reloc_upper_bound(bfd *abfd, asection *sect);

DESCRIPTION

        Return the number of bytes required to store the

        relocation information associated with section @var{sect}

        attached to bfd @var{abfd}.  If an error occurs, return -1.

*/

long

bfd_get_reloc_upper_bound (abfd, asect)

     bfd *abfd;

     sec_ptr asect;

{

  if (abfd->format != bfd_object) {

    bfd_set_error (bfd_error_invalid_operation);

    return -1;

  }

  return BFD_SEND (abfd, _get_reloc_upper_bound, (abfd, asect));

}

/*

FUNCTION

        bfd_canonicalize_reloc

SYNOPSIS

        long bfd_canonicalize_reloc

                (bfd *abfd,

                asection *sec,

                arelent **loc,

                asymbol **syms);

DESCRIPTION

        Call the back end associated with the open BFD

        @var{abfd} and translate the external form of the relocation

        information attached to @var{sec} into the internal canonical

        form.  Place the table into memory at @var{loc}, which has

        been preallocated, usually by a call to

        <<bfd_get_reloc_upper_bound>>.  Returns the number of relocs, or

        -1 on error.

        The @var{syms} table is also needed for horrible internal magic

        reasons.

*/

long

bfd_canonicalize_reloc (abfd, asect, location, symbols)

     bfd *abfd;

     sec_ptr asect;

     arelent **location;

     asymbol **symbols;

{

  if (abfd->format != bfd_object) {

    bfd_set_error (bfd_error_invalid_operation);

    return -1;

  }

  return BFD_SEND (abfd, _bfd_canonicalize_reloc,

                   (abfd, asect, location, symbols));

}

/*

FUNCTION

        bfd_set_reloc

SYNOPSIS

        void bfd_set_reloc

          (bfd *abfd, asection *sec, arelent **rel, unsigned int count)

DESCRIPTION

        Set the relocation pointer and count within

        section @var{sec} to the values @var{rel} and @var{count}.

        The argument @var{abfd} is ignored.

*/

/*ARGSUSED*/

void

bfd_set_reloc (ignore_abfd, asect, location, count)

     bfd *ignore_abfd ATTRIBUTE_UNUSED;

     sec_ptr asect;

     arelent **location;

     unsigned int count;

{

  asect->orelocation = location;

  asect->reloc_count = count;

}

/*

FUNCTION

        bfd_set_file_flags

SYNOPSIS

        boolean bfd_set_file_flags(bfd *abfd, flagword flags);

DESCRIPTION

        Set the flag word in the BFD @var{abfd} to the value @var{flags}.

        Possible errors are:

        o <<bfd_error_wrong_format>> - The target bfd was not of object format.

        o <<bfd_error_invalid_operation>> - The target bfd was open for reading.

        o <<bfd_error_invalid_operation>> -

        The flag word contained a bit which was not applicable to the

        type of file.  E.g., an attempt was made to set the <<D_PAGED>> bit

        on a BFD format which does not support demand paging.

*/

boolean

bfd_set_file_flags (abfd, flags)

     bfd *abfd;

     flagword flags;

{

  if (abfd->format != bfd_object) {

    bfd_set_error (bfd_error_wrong_format);

    return false;

  }

  if (bfd_read_p (abfd)) {

    bfd_set_error (bfd_error_invalid_operation);

    return false;

  }

  bfd_get_file_flags (abfd) = flags;

  if ((flags & bfd_applicable_file_flags (abfd)) != flags) {

    bfd_set_error (bfd_error_invalid_operation);

    return false;

  }

return true;

}

void

bfd_assert (file, line)

     const char *file;

     int line;

{

  (*_bfd_error_handler) (_("bfd assertion fail %s:%d"), file, line);

}

/* A more or less friendly abort message.  In libbfd.h abort is

   defined to call this function.  */

#ifndef EXIT_FAILURE

#define EXIT_FAILURE 1

#endif

void

_bfd_abort (file, line, fn)

     const char *file;

     int line;

     const char *fn;

{

  if (fn != NULL)

    (*_bfd_error_handler)

      (_("BFD internal error, aborting at %s line %d in %s\n"),

       file, line, fn);

  else

    (*_bfd_error_handler)

      (_("BFD internal error, aborting at %s line %d\n"),

       file, line);

  (*_bfd_error_handler) (_("Please report this bug.\n"));

  xexit (EXIT_FAILURE);

}

/*

FUNCTION

        bfd_set_start_address

SYNOPSIS

        boolean bfd_set_start_address(bfd *abfd, bfd_vma vma);

DESCRIPTION

        Make @var{vma} the entry point of output BFD @var{abfd}.

RETURNS

        Returns <<true>> on success, <<false>> otherwise.

*/

boolean

bfd_set_start_address(abfd, vma)

bfd *abfd;

bfd_vma vma;

{

  abfd->start_address = vma;

  return true;

}

/*

FUNCTION

        bfd_get_mtime

SYNOPSIS

        long bfd_get_mtime(bfd *abfd);

DESCRIPTION

        Return the file modification time (as read from the file system, or

        from the archive header for archive members).

*/

long

bfd_get_mtime (abfd)

     bfd *abfd;

{

  FILE *fp;

  struct stat buf;

  if (abfd->mtime_set)

    return abfd->mtime;

  fp = bfd_cache_lookup (abfd);

  if (0 != fstat (fileno (fp), &buf))

    return 0;

  abfd->mtime = buf.st_mtime;           /* Save value in case anyone wants it */

  return buf.st_mtime;

}

/*

FUNCTION

        bfd_get_size

SYNOPSIS

        long bfd_get_size(bfd *abfd);

DESCRIPTION

        Return the file size (as read from file system) for the file

        associated with BFD @var{abfd}.

        The initial motivation for, and use of, this routine is not

        so we can get the exact size of the object the BFD applies to, since

        that might not be generally possible (archive members for example).

        It would be ideal if someone could eventually modify

        it so that such results were guaranteed.

        Instead, we want to ask questions like "is this NNN byte sized

        object I'm about to try read from file offset YYY reasonable?"

        As as example of where we might do this, some object formats

        use string tables for which the first <<sizeof(long)>> bytes of the

        table contain the size of the table itself, including the size bytes.

        If an application tries to read what it thinks is one of these

        string tables, without some way to validate the size, and for

        some reason the size is wrong (byte swapping error, wrong location

        for the string table, etc.), the only clue is likely to be a read

        error when it tries to read the table, or a "virtual memory

        exhausted" error when it tries to allocate 15 bazillon bytes

        of space for the 15 bazillon byte table it is about to read.

        This function at least allows us to answer the quesion, "is the

        size reasonable?".

*/

long

bfd_get_size (abfd)

     bfd *abfd;

{

  FILE *fp;

  struct stat buf;

  if ((abfd->flags & BFD_IN_MEMORY) != 0)

    return ((struct bfd_in_memory *) abfd->iostream)->size;

  fp = bfd_cache_lookup (abfd);

  if (0 != fstat (fileno (fp), &buf))

    return 0;

  return buf.st_size;

}

/*

FUNCTION

        bfd_get_gp_size

SYNOPSIS

        int bfd_get_gp_size(bfd *abfd);

DESCRIPTION

        Return the maximum size of objects to be optimized using the GP

        register under MIPS ECOFF.  This is typically set by the <<-G>>

        argument to the compiler, assembler or linker.

*/

int

bfd_get_gp_size (abfd)

     bfd *abfd;

{

  if (abfd->format == bfd_object)