Soft Float for PC386

[Smith, Gene]

I am trying to include soft-float on my rtems-4.5.0 386 system (no
coprocessor). This thread indicates there was (is?) a problem with the
newlib rpms. I am using the newlib rpm updated in Sept for 4.5.0. However,
the compile of paranoia fails due to undefined fp routines (I have set
CPU_CFLAG = -msoft-float -mno-fp-ret-in-387).  

Is it ok to use snapshot or preview rpms (need newlib1.9.0-1 per below) with
my 4.5.0 system without totally upgrading rtems to the 4.5.1-preview or a
snapshot? If so, which ones? (I see some that indicated they are
LATEST_TRUSTED.)

Tks,
-gene

>-----Original Message-----
>From: Angelo Fraietta [mailto:angelo at hunterlink.net.au]
>Sent: Tuesday, February 27, 2001 4:10 AM
>To: corsepiu at faw.uni-ulm.de; rtems-users; Joel Sherrill
>Subject: Re: Soft Float for PC386
>
>
>Wait on that, I have just found that there was another RPM 
>made, being the i386-rtems-gcc-gcc2.95.2newlib1.9.0-1.i386.rpm   as
>well as the rtems-base-gcc-gcc2.95.2newlib1.9.0-1.i386.rpm
>(I thought my machine had frozen up after the first RPM was made)
>I'll rebuild RTEMS and check again. Sorry about that.
>
>Angelo Fraietta wrote:
>
>> The computer no longer re-boots when running two tasks with  
>the -mno-fp-ret-in-387 flags.
>> However, there are still co-processor commands occuring. 
>This is where the exception occurs:
>>
>> with CPU_CFLAGS =-msoft-float -mno-fp-ret-in-387
>>
>>   10ba89: 5e                    pop    %esi
>>   10ba8a: 5f                    pop    %edi
>>   10ba8b: dd 45 f0              fldl   0xfffffff0(%ebp)
>>   10ba8e: c9                    leave
>>
>> Ralf Corsepius wrote:
>>
>> > Angelo Fraietta wrote:
>> > >
>> > > If I build the pc386 with both the -mno-fp-ret-in-387 
>and the -msoft-float flags
>> > > the machine re-boots if you try to create a task. Eg, if 
>you try to run the
>> > > ticker sample, the machine re-boots.  If you only use 
>the -msoft-float and not
>> > > the -mno-fp-ret-in-387 flag, the tasks run OK.
>> > > I am mentioning this because the ts_386ex build uses 
>both flags, and so if
>> > > someone tests these on a ts_386ex, they may want to try 
>running ticker on it to
>> > > see if it crashes.
>> > >
>> > This doesn't surprize me, because newlib unconditionally inserts
>> > FPU-code into its libc, no matter which compiler options are used
>> > for building it. I.e. at least one cause of your problems 
>is lurking
>> > in newlib.
>> >
>> > I believe to have fixed this issue, so you could consider 
>rebuilding
>> > your gcc-newlib rpms, using the *.nosrc.rpm below, which 
>contains my
>> > fixes.
>> >
>> > Procedure for rebuilding:
>> > 1) Copy gcc-2.95.2.tar.gz and newlib-1.9.0.tar.gz to
>> > /usr/src/redhat/SOURCES.
>> >
>> > 2) rpm -i i386-rtems-gcc-newlib-gcc2.95.2newlib1.9.0-1.nosrc.rpm
>> > [This will install RTEMS diffs and my patches to
>> > /usr/src/redhat/SOURCES]
>> >
>> > 3)
>> > export PATH=/opt/rtems/bin:$PATH
>> > rpm -bb
>> > 
>/usr/src/redhat/SPECS/i386-rtems-gcc-newlib-gcc2.95.2newlib1.9.0.spec
>> > [Now wait a couple of hours for the built to finish. Requires 500MB
>> > to 1GB of free diskspace below /usr/src/redhat]
>> >
>> > 4) /usr/src/redhat/RPMS/i386 now should contain the new
>> > i386-rtems-*.rpms
>> >
>> > 5) Rebuild RTEMS w/ -msoft-float -mno-fp-ret-in-387.
>> >
>> > 6) Test at run-time.
>> >
>> > Hope that helps.
>> >
>> > FYI: These patches already are submitted to Joel and to the newlib
>> > maintainers.
>> >
>> > AFAIK, Joel already is preparing new RTEMS toolchain rpms. 
>So if you
>> > can't build the toolchain yourself for some reason, it's probably
>> > only a matter of days until new RTEMS toolchain rpms will appear on
>> > OAR's site.
>> >
>> > 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
>> >
>> >   
>---------------------------------------------------------------
>---------
>> >                                                            
>  Name: i386-rtems-gcc-newlib-gcc2.95.2newlib1.9.0-1.nosrc.rpm
>> >    i386-rtems-gcc-newlib-gcc2.95.2newlib1.9.0-1.nosrc.rpm  
>  Type: RealPlayer(tm) as Plug-in (audio/x-pn-realaudio-plugin)
>> >                                                          
>Encoding: base64
>>
>> --
>> 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)
>
>