<font size=2 face="sans-serif">Hi Jiri.</font>
<br>
<br><font size=2 face="sans-serif">My understanding from reading the "Disaster
Strikes" section of the FPU page </font>
<br><font size=2 face="sans-serif">(</font><a href=https://devel.rtems.org/wiki/TBR/UserManual/Floating_Point_Support><font size=2 color=blue face="sans-serif">https://devel.rtems.org/wiki/TBR/UserManual/Floating_Point_Support</font></a><font size=2 face="sans-serif">)
is that </font>
<br><font size=2 face="sans-serif">at some point the leon3.cfg was switched
to "-msoft-float" to avoid spurious generation </font>
<br><font size=2 face="sans-serif">of FPU instructions in the kernel by
GCC. </font>
<br>
<br><font size=2 face="sans-serif">But as you can see in my original bug
report, this ends up meaning that we can't use </font>
<br><font size=2 face="sans-serif">the native FPU **at all** - attempting
to compile application code *without* -msoft-float </font>
<br><font size=2 face="sans-serif">leads to the crash in newlib that I
reported. </font>
<br>
<br><font size=2 face="sans-serif">My report includes all the steps needed
to reproduce the issue - do you see anything </font>
<br><font size=2 face="sans-serif">wrong in the set of commands I used
to build RSB or RTEMS or the sample?</font>
<br>
<br><font size=2 face="sans-serif">Your latest answer seems to imply that
if I remove the "-msoft-float" from leon3.cfg, then </font>
<br><font size=2 face="sans-serif">I can't, in fact use the Leon3 BSP.
If that is the case, then how can I build a native-FPU-using</font>
<br><font size=2 face="sans-serif">version of anything? </font>
<br>
<br><font size=2 face="sans-serif">Thanks in advance and Kind regards,</font>
<br><font size=2 face="sans-serif">Thanassis.</font>
<br>
<br><font size=2 face="sans-serif"><b>European Space Agency (via HE Space)</b></font>
<br><font size=2 color=#000080 face="sans-serif">Thanassis Tsiodras</font>
<br><font size=2 face="sans-serif">Real-time Embedded Software Engineer
</font>
<br><font size=2 face="sans-serif">System, Software and Technology Department</font>
<br>
<br><font size=2 face="sans-serif"><b>ESTEC</b></font>
<br><font size=2 face="sans-serif">Keplerlaan 1, PO Box 299</font>
<br><font size=2 face="sans-serif">NL-2200 AG Noordwijk, The Netherlands</font>
<br><font size=2 face="sans-serif">Athanasios.Tsiodras@esa.int | </font><a href=www.esa.int><font size=2 color=blue face="sans-serif">www.esa.int</font></a>
<br><font size=2 face="sans-serif">T +31 71 565 5332</font>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">"Jiri Gaisler"
<jiri@gaisler.se></font>
<br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">Athanasios.Tsiodras@esa.int,
"RTEMS List" <users@rtems.org></font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">08/02/2016 13:07</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">Re: Crash under
sparc/rtems-4.11 when compiling with FPU</font>
<br>
<hr noshade>
<br>
<br>
<br><font size=3><br>
</font>
<br><font size=3>On 08/02/16 11:46, </font><a href=mailto:Athanasios.Tsiodras@esa.int><font size=3 color=blue><u>Athanasios.Tsiodras@esa.int</u></font></a><font size=3>
wrote:</font>
<br><font size=2 face="sans-serif">Hi Jerry.</font><font size=3> <br>
</font><font size=2 face="sans-serif"><br>
Thanks for the suggestion - indeed, If you look at my response to Jiri,
you'll see that I verified that the -mhard-float is not necessary (objdump
verified that FPU instructions are emitted by default, if you don't pass
-msoft-float).</font><font size=3> <br>
</font><font size=2 face="sans-serif"><br>
I am now scripting my nightly build to do the patch explicitly, so I can
follow the tip of 4.11 with native FPU support (our intended target).</font><font size=3>
<br>
</font><font size=2 face="sans-serif"><br>
I didn't try the switch to v8 - since the removal of -msoft-float from
leon3.cfg proved enough in my tests, and I am guessing the default leon3.cfg
configuration was chosen to be -mcypress for a reason... At least I hope
so :-)</font>
<br><font size=3><br>
<br>
Just remember that if the compiler emits *any* FPU instruction in the kernel
or non-FPU threads, you can get a crash. You should use objdump on the
final binary to verify that you don't have spurious FPU instructions in
the wrong place.<br>
<br>
Jiri.<br>
</font>
<br><font size=3><br>
</font><font size=2 face="sans-serif"><br>
Thanks!</font><font size=3> <br>
</font><font size=2 face="sans-serif"><b><br>
European Space Agency (via HE Space)</b></font><font size=3> </font><font size=2 color=#000080 face="sans-serif"><br>
Thanassis Tsiodras</font><font size=3> </font><font size=2 face="sans-serif"><br>
Real-time Embedded Software Engineer <br>
System, Software and Technology Department</font><font size=3> <br>
</font><font size=2 face="sans-serif"><b><br>
ESTEC</b></font><font size=3> </font><font size=2 face="sans-serif"><br>
Keplerlaan 1, PO Box 299</font><font size=3> </font><font size=2 face="sans-serif"><br>
NL-2200 AG Noordwijk, The Netherlands</font><font size=3> </font><font size=2 color=blue face="sans-serif"><u><br>
</u></font><a href=mailto:Athanasios.Tsiodras@esa.int><font size=2 color=blue face="sans-serif"><u>Athanasios.Tsiodras@esa.int</u></font></a><font size=2 face="sans-serif">
| </font><a href=www.esa.int></a><a href=http://www.esa.int/><font size=2 color=blue face="sans-serif"><u>www.esa.int</u></font></a><font size=3>
</font><font size=2 face="sans-serif"><br>
T +31 71 565 5332</font><font size=3> <br>
<br>
<br>
</font><font size=1 color=#5f5f5f face="sans-serif"><br>
From: </font><font size=1 face="sans-serif">"Needell,
Jerry" </font><a href=mailto:Jerry.Needell@unh.edu><font size=1 color=blue face="sans-serif"><u><Jerry.Needell@unh.edu></u></font></a><font size=3>
</font><font size=1 color=#5f5f5f face="sans-serif"><br>
To: </font><a href=mailto:Athanasios.Tsiodras@esa.int><font size=1 color=blue face="sans-serif"><u>"Athanasios.Tsiodras@esa.int"</u></font></a><font size=1 face="sans-serif">
</font><a href=mailto:Athanasios.Tsiodras@esa.int><font size=1 color=blue face="sans-serif"><u><Athanasios.Tsiodras@esa.int></u></font></a><font size=3>
</font><font size=1 color=#5f5f5f face="sans-serif"><br>
Cc: </font><font size=1 face="sans-serif">"Needell,
Jerry" </font><a href=mailto:Jerry.Needell@unh.edu><font size=1 color=blue face="sans-serif"><u><Jerry.Needell@unh.edu></u></font></a><font size=1 face="sans-serif">,
"RTEMS List" </font><a href=mailto:users@rtems.org><font size=1 color=blue face="sans-serif"><u><users@rtems.org></u></font></a><font size=3>
</font><font size=1 color=#5f5f5f face="sans-serif"><br>
Date: </font><font size=1 face="sans-serif">08/02/2016
11:36</font><font size=3> </font><font size=1 color=#5f5f5f face="sans-serif"><br>
Subject: </font><font size=1 face="sans-serif">Re:
Crash under sparc/rtems-4.11 when compiling with FPU</font><font size=3>
<br>
</font>
<hr noshade><font size=3><br>
<br>
<br>
sorry for the typo - I meant -mcpu v8 … <br>
I have used this for bsps (RTEMS 4.9) with FPU without needing the -mhard-float
specification <br>
For non FPU bsps I have used -msoft-float <br>
both with-mcpu v8 <br>
<br>
<br>
On Feb 8, 2016, at 5:14 AM, Needell, Jerry <</font><a href=mailto:Jerry.Needell@unh.edu></a><a href=mailto:Jerry.Needell@unh.edu><font size=3 color=blue><u>Jerry.Needell@unh.edu</u></font></a><font size=3>>
wrote: <br>
<br>
I thought it was best to use -mv8 rather tahtn -mcypress for leon3 bsps?
Does this make any difference in your case? <br>
On Feb 8, 2016, at 4:50 AM, </font><a href=mailto:Athanasios.Tsiodras@esa.int></a><a href=mailto:Athanasios.Tsiodras@esa.int><font size=3 color=blue><u>Athanasios.Tsiodras@esa.int</u></font></a><font size=3>
wrote: <br>
</font><font size=2 face="sans-serif"><br>
I verified Sebastian's suggestion - by modifying the leon3.cfg file...</font><font size=3>
</font><font size=2 face="sans-serif"><br>
<br>
diff --git a/c/src/lib/libbsp/sparc/leon3/make/custom/leon3.cfg
b/c/src/lib/libbsp/sparc/leon3/make/custom/leon3.cfg</font><font size=3>
</font><font size=2 face="sans-serif"><br>
index 58f2f07..30fc3a4 100644</font><font size=3> </font><font size=2 face="sans-serif"><br>
--- a/c/src/lib/libbsp/sparc/leon3/make/custom/leon3.cfg</font><font size=3>
</font><font size=2 face="sans-serif"><br>
+++ b/c/src/lib/libbsp/sparc/leon3/make/custom/leon3.cfg</font><font size=3>
</font><font size=2 face="sans-serif"><br>
@@ -9,7 +9,8 @@ RTEMS_CPU_MODEL=leon3</font><font size=3>
</font><font size=2 face="sans-serif"><br>
<br>
# This contains the compiler options necessary to select
the CPU model</font><font size=3> </font><font size=2 face="sans-serif"><br>
# and (hopefully) optimize for it.</font><font size=3>
</font><font size=2 face="sans-serif"><br>
-CPU_CFLAGS = -mcpu=cypress -msoft-float</font><font size=3>
</font><font size=2 face="sans-serif"><br>
+CPU_CFLAGS = -mcpu=cypress -mhard-float</font><font size=3>
</font><font size=2 face="sans-serif"><br>
<br>
...the generated binary of hello.exe works fine - I went a step further
and did a test calculation, too:</font><font size=3> </font><font size=2 face="sans-serif"><br>
<br>
diff --git a/testsuites/samples/hello/init.c b/testsuites/samples/hello/init.c</font><font size=3>
</font><font size=2 face="sans-serif"><br>
index d8fe450..6ee33f6 100644</font><font size=3> </font><font size=2 face="sans-serif"><br>
--- a/testsuites/samples/hello/init.c</font><font size=3>
</font><font size=2 face="sans-serif"><br>
+++ b/testsuites/samples/hello/init.c</font><font size=3>
</font><font size=2 face="sans-serif"><br>
@@ -27,8 +27,13 @@ rtems_task Init(</font><font size=3> </font><font size=2 face="sans-serif"><br>
rtems_task_argument ignored</font><font size=3> </font><font size=2 face="sans-serif"><br>
)</font><font size=3> </font><font size=2 face="sans-serif"><br>
{</font><font size=3> </font><font size=2 face="sans-serif"><br>
+ int i = 0;</font><font size=3> </font><font size=2 face="sans-serif"><br>
+ float a=3.14159f, b=1.0f;</font><font size=3> </font><font size=2 face="sans-serif"><br>
+</font><font size=3> </font><font size=2 face="sans-serif"><br>
rtems_test_begin();</font><font size=3> </font><font size=2 face="sans-serif"><br>
- printf( "Hello World\n" );</font><font size=3>
</font><font size=2 face="sans-serif"><br>
+ for (i=0; i<10; i++)</font><font size=3> </font><font size=2 face="sans-serif"><br>
+ b*=a;</font><font size=3> </font><font size=2 face="sans-serif"><br>
+ printf( "Hello World, %f\n", b );</font><font size=3>
</font><font size=2 face="sans-serif"><br>
rtems_test_end();</font><font size=3> </font><font size=2 face="sans-serif"><br>
exit( 0 );</font><font size=3> </font><font size=2 face="sans-serif"><br>
}</font><font size=3> </font><font size=2 face="sans-serif"><br>
<br>
...which worked fine:</font><font size=3> </font><font size=2 face="sans-serif"><br>
<br>
(gdb) tar extended-remote ... ( to grmon)</font><font size=3>
</font><font size=2 face="sans-serif"><br>
(gdb) c</font><font size=3> </font><font size=2 face="sans-serif"><br>
Continuing.</font><font size=3> </font><font size=2 face="sans-serif"><br>
<br>
*** BEGIN OF TEST HELLO WORLD ***</font><font size=3> </font><font size=2 face="sans-serif"><br>
Hello World, 1.000000</font><font size=3> </font><font size=2 face="sans-serif"><br>
*** END OF TEST HELLO WORLD ***</font><font size=3> </font><font size=2 face="sans-serif"><br>
<br>
...and I made sure that FPU instructions are inside:</font><font size=3>
</font><font size=2 face="sans-serif"><br>
<br>
for (i=0; i<10; i++)</font><font size=3> </font><font size=2 face="sans-serif"><br>
28: 82 80 7f ff addcc %g1,
-1, %g1</font><font size=3> </font><font size=2 face="sans-serif"><br>
2c: 12 bf ff ff bne 28 <Init+0x28></font><font size=3>
</font><font size=2 face="sans-serif"><br>
30: 91 a2 09 29 fmuls %f8,
%f9, %f8</font><font size=3> </font><font size=2 face="sans-serif"><br>
b*=a;</font><font size=3> </font><font size=2 face="sans-serif"><br>
printf( "Hello World, %f\n", b );</font><font size=3>
</font><font size=2 face="sans-serif"><br>
34: 91 a0 19 28 fstod %f8,
%f8</font><font size=3> </font><font size=2 face="sans-serif"><br>
<br>
So, executive summary.... It seems that the default compilation settings
of the Leon3 BSP forbid "real FPU" work. <br>
If one needs to work in native (non-emulated) FPU mode, then the leon3.cfg
must be patched as I showed above. <br>
<br>
In the long run, as Sebastian indicated, a leon3fp (and a corresponding
leon2fp, I imagine) <br>
should ideally be added as new BSP targets - and the FPU page</font><font size=3>
</font><font size=2 face="sans-serif"><br>
(</font><a href=https://devel.rtems.org/wiki/TBR/UserManual/Floating_Point_Support><font size=2 color=blue face="sans-serif"><u>https://devel.rtems.org/wiki/TBR/UserManual/Floating_Point_Support</u></font></a><font size=2 face="sans-serif">)
should probably <br>
be updated to indicate this.</font><font size=3> </font><font size=2 face="sans-serif"><br>
<br>
Thanks to everyone for their help,</font><font size=3> </font><font size=2 face="sans-serif"><br>
Thanassis.</font><font size=3> <br>
</font><font size=2 face="sans-serif"><b><br>
<br>
European Space Agency (via HE Space)</b></font><font size=3> </font><font size=2 color=#000080 face="sans-serif"><br>
Thanassis Tsiodras</font><font size=3> </font><font size=2 face="sans-serif"><br>
Real-time Embedded Software Engineer <br>
System, Software and Technology Department</font><font size=3> </font><font size=2 face="sans-serif"><b><br>
<br>
ESTEC</b></font><font size=3> </font><font size=2 face="sans-serif"><br>
Keplerlaan 1, PO Box 299</font><font size=3> </font><font size=2 face="sans-serif"><br>
NL-2200 AG Noordwijk, The Netherlands</font><font size=3> </font><font size=3 color=blue><u><br>
</u></font><a href=mailto:Athanasios.Tsiodras@esa.int><font size=2 color=blue face="sans-serif"><u>Athanasios.Tsiodras@esa.int</u></font></a><font size=2 face="sans-serif">
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T +31 71 565 5332</font><font size=3> <br>
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<br>
From: </font><font size=1 face="sans-serif">"Sebastian
Huber" <</font><a href="mailto:sebastian.huber@embedded-brains.de"><font size=1 color=blue face="sans-serif"><u>sebastian.huber@embedded-brains.de</u></font></a><font size=1 face="sans-serif">></font><font size=3>
</font><font size=1 color=#5f5f5f face="sans-serif"><br>
To: </font><font size=1 face="sans-serif">"RTEMS
List" <</font><a href=mailto:users@rtems.org><font size=1 color=blue face="sans-serif"><u>users@rtems.org</u></font></a><font size=1 face="sans-serif">></font><font size=3>
</font><font size=1 color=#5f5f5f face="sans-serif"><br>
Cc: </font><a href=mailto:software@gaisler.com><font size=1 color=blue face="sans-serif"><u>software@gaisler.com</u></font></a><font size=3>
</font><font size=1 color=#5f5f5f face="sans-serif"><br>
Date: </font><font size=1 face="sans-serif">07/02/2016
07:40</font><font size=3> </font><font size=1 color=#5f5f5f face="sans-serif"><br>
Subject: </font><font size=1 face="sans-serif">Re:
Crash under sparc/rtems-4.11 when compiling with FPU</font><font size=3>
</font><font size=1 color=#5f5f5f face="sans-serif"><br>
Sent by: </font><font size=1 face="sans-serif">"users"
<</font><a href="mailto:users-bounces@rtems.org"><font size=1 color=blue face="sans-serif"><u>users-bounces@rtems.org</u></font></a><font size=1 face="sans-serif">></font><font size=3>
<br>
</font>
<hr noshade><font size=3><br>
</font><tt><font size=2><br>
<br>
Hello Athanasios,<br>
<br>
it was always a miracle to me how you are supposed to use the leon2/leon3
BSPs with a FPU. If you want to use the FPU, then the BSP must be built
with the -mhard-float option, otherwise the FPU support is not enabled
in the operating system support. In addition the application configuration
must be compiled with exactly the same compiler flags as the BSP, otherwise
it will generate a corrupt configuration.<br>
<br>
I think we need leon2fp and leon3fp BSPs, which use -mhard-float.<br>
<br>
-- <br>
Sebastian Huber, embedded brains GmbH<br>
<br>
Address : Dornierstr. 4, D-82178 Puchheim, Germany<br>
Phone : +49 89 189 47 41-16<br>
Fax : +49 89 189 47 41-09<br>
E-Mail : sebastian.huber at </font></tt><a href="http://embedded-brains.de/"><tt><font size=2 color=blue><u>embedded-brains.de</u></font></tt></a><tt><font size=2><br>
PGP : Public key available on request.<br>
<br>
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.<br>
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