Soft Float for PC386

[Angelo Fraietta]

Tell me if I am right here,

The .num file has the symbol table.  I should be able to find the appropriate symbol because it is the same or the
one before the number, ie 10BA8B

I look in the symbol table and find these

    0010b958 T __pack_d
    0010ba90 T __pack_f

 so I would assume that the fault is in __pack_d, however, when I decompiled the exe, I found lots of call 10ba58,
but
when I look for it I find this instead of 10b958:

        10b957: 00 55 89              add    %dl,0xffffff89(%ebp)

This means that the call will go to the 55 instead of the 00. Am I on the right track??

Angelo Fraietta wrote:

> when I do objdump -t, it says there are no symbols. Does this mean that I have to do it with the debug build?
>
> Joel Sherrill wrote:
>
> > Ralf Corsepius wrote:
> > >
> > > Angelo Fraietta wrote:
> > > >
> > > > I have noticed during the configure stage of the script, the following is shown (this is from the ts_386 so
> > > > it should be soft float)
> > > > running /bin/sh ../../../../../RTEMS4.5.0ss/c/src/make/configure  --host=i386-rt
> > > > ems --build=i586-pc-linux-gnu --target=i386-rtems --prefix=/opt/rtems --disable-
> > > > hwapi --enable-multiprocessing --enable-cxx --enable-rdbg --disable-tests --disa
> > > > ble-networking --enable-posix --disable-itron --with-target-subdir=i386-rtems --
> > > > libdir=/opt/rtems/i386-rtems/lib --cache-file=.././config.cache --srcdir=../../.
> > > >
> > > > does libdir=/opt/rtems/i386-rtems/lib mean that it would be linking with the libraries in that directory
> > > > instead of the soft-float directory?
> > > No. libdir is used by autoconf and automake to specify the path to
> > > the directory where libraries shall be install during "make
> > > install".
> > > Currently is not used at all by RTEMS,and therefore should not have
> > > any influence at all.
> > >
> > > > Shouldn't that be /opt/rtems/i386-rtems/lib/soft-float ??
> > > No. libdir can vary inside of the build tree and should better not
> > > be passed manually to the toplevel configure script at all.
> > >
> > > However, there should neither be a need to set it, nor should having
> > > set it have any effect on building RTEMS. (Warning: Future versions
> > > of RTEMS probably will be using it.)
> > >
> > > > I copied the files from the soft-float directory to that directory but still had the same fault, i.e.
> > > > exception 7.
> > > >  Is there anywhere else I should be looking
> > > You could try to isolate the location of the offending FPU-call
> > > (find the caller, eg. by debugging paranoia.exe, disassembly,
> > > linker-map analysis).
> >
> > My guess is that incorrectly/accidentally there is an FP instruction.
> > It could be by linking against the wrong library, incorrect code
> > generation, or simply a piece of code assuming an FPU.  Given the
> > fault address, you can do an objdump on the executable and see
> > what instruction is at that address.  Using the objdump and symbol
> > table (nm), you can tell what routine the offending instruction is
> > in.  That plus possible the output of linking with -v should be
> > enough to figure out where to look.
> >
> > > > or am I off the track completely??
> > > :)
> > >
> > > >
> > > > angelo wrote:
> > > >
> > > > > Is it possible that the wrong libraries are being linked.
> > > You might want to add -v to the linker invocation in your BSP's
> > > make-exe (make/custom/<BSP>.cfg) and try to analyse the what it
> > > reports for linking paranoia.exe.
> > >
> > > Ralf
> > >
> > > --
> > > Ralf Corsepius
> > > Forschungsinstitut fuer Anwendungsorientierte Wissensverarbeitung
> > > (FAW)
> > > Helmholtzstr. 16, 89081 Ulm, Germany     Tel: +49/731/501-8690
> > > mailto:corsepiu at faw.uni-ulm.de           FAX: +49/731/501-999
> > > http://www.faw.uni-ulm.de
> >
> > --
> > Joel Sherrill, Ph.D.             Director of Research & Development
> > joel at OARcorp.com                 On-Line Applications Research
> > Ask me about RTEMS: a free RTOS  Huntsville AL 35805
> > Support Available                (256) 722-9985
>
> --
> Angelo Fraietta
>
> PO Box 859
> Hamilton NSW 2303
>
> Home Page
>
> http://users.hunterlink.net.au/~maaaf/
>
> There are those who seek knowledge for the sake of knowledge - that is CURIOSITY
> There are those who seek knowledge to be known by others - that is VANITY
> There are those who seek knowledge in order to serve - that is LOVE
>     Bernard of Clairvaux (1090 - 1153)

--
Angelo Fraietta

PO Box 859
Hamilton NSW 2303

Home Page

http://users.hunterlink.net.au/~maaaf/

There are those who seek knowledge for the sake of knowledge - that is CURIOSITY
There are those who seek knowledge to be known by others - that is VANITY
There are those who seek knowledge in order to serve - that is LOVE
    Bernard of Clairvaux (1090 - 1153)