Re: File not recognized in objdump!!

["Aashish Gupta" <aashish dot tap at gmail dot com>]

Jim,
I already stepped through the fucntion "bfd_check_format_matches" and
figured out that its not recognizing the target format ... The error
looks something like this..


(gdb) run objdump
Starting program: /root/Desktop/binutils1/gas/as-new objdump

Breakpoint 6, as_perror (gripe=0x80d7638 "Selected target format '%s' unknown",
   filename=0x80db2be "elf64-ia64-little") at messages.c:124

((Our target is elf64-ia64-big though ..?? and have made modification
accordingly..))
124     {
(gdb) break bfd_check_format_matches
Breakpoint 9 at 0x8088099: file format.c, line 118.
(gdb) n
126       int saved_errno = errno;
(gdb) n
128       as_show_where ();
(gdb) n
Assembler messages:
129       fprintf (stderr, gripe, filename);
(gdb) n
Selected target format 'elf64-ia64-little' unknown130     errno = saved_errno;
(gdb) n
131       errtxt = bfd_errmsg (bfd_get_error ());
(gdb) n
132       fprintf (stderr, ": %s\n", errtxt);
(gdb) n
: Invalid bfd target
133       errno = 0;
(gdb) n
135     }
(gdb) n
134       bfd_set_error (bfd_error_no_error);
(gdb)
135     }
(gdb) n
as_perror (gripe=0x80d4a34 "a.out", filename=0x0) at messages.c:134
134       bfd_set_error (bfd_error_no_error);


Thanks..

> On 3/27/07, Jim Wilson <wilson@specifix.com> wrote:
> >  On Mon, 2007-03-26 at 10:44 +0530, Aashish Gupta wrote:
> > > I am trying to modify objdump to dump object file information for a
> > > ELF64 file but on a different
> > > kernel but its giving an error saying file format not recognized.
> >
> > Trying the command
> >   grep "File format not recognized"
> > we find it is defined in bfd.c.  Looking at this file, we see that this
> > is in an error, and an enum defined nearby shows that the array index is
> > bfd_error_file_not_recognized.  So now grepping for that enum, we find
> > that there are two bfd_set_error calls in the file format.c that use it.
> > Both calls are in the function bfd_check_format_matches.  Run objdump
> > under gdb, put a breakpoint here, and step through the code to see what
> > it is doing.
> > --
> > Jim Wilson, GNU Tools Support, http://www.specifix.com
> >
> >
> >
>
>
>
>
> --
> Regards,
> Aashish Gupta.
>
>
> ---------------------------------------------------
> Live life as  you have no tomorrow, dream as you have eternity..!!



--
Regards,
Aashish Gupta.


---------------------------------------------------
Live life as  you have no tomorrow, dream as you have eternity..!!