From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philippe Gerum <rpm@xenomai.org>
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Date: Wed, 05 Aug 2009 13:58:15 +0200
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Subject: Re: [Xenomai-help] Stack sizes etc. (Re: POSIX skin/Blackfin:
 SIGSEGV when stracing or gdb'ing)
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To: xenoka09@domain.hid
Cc: xenomai@xenomai.org

On Mon, 2009-08-03 at 19:29 +0200, Kolja Waschk wrote:
> Hi,
> 
> > - if the first option does not work, override the shipped Xenomai
> > release with a stock one for testing:
> 
> I've now managed to use the prepare-kernel.sh (with
> adeos-ipipe-2.6.28.10-blackfin.git-1.10-00.patch as it comes with
> xenomai-2.4.8) on the 2.6.28.10 kernel that comes as "linux-2.6.x" with
> uClinux-dist 2009R1-RC2.  Unfortunately, the three files ipipe.h,
> ipipe.c and ints-priority.c therein already contain the changes from the
> 1.10 patch, so to apply that patch, they had to be reverted beforehand.
> 
> In userland and for my application I used stock xenomai-2.4.8; only the
> xenomai-2.4.x.patch from uClinux-dist/user/xenomai had to be applied
> so that /usr can be specified as a destination during configure. But
> that patch doesn't change anything in the code.
> 
> Now, well, what should I say - the xnshadow call still fails. Or
> whatever the real cause for this message is...
> 

Does this help?

diff --git a/ksrc/arch/blackfin/switch.S b/ksrc/arch/blackfin/switch.S
index 906e5f5..6696a2f 100644
--- a/ksrc/arch/blackfin/switch.S
+++ b/ksrc/arch/blackfin/switch.S
@@ -85,15 +85,19 @@ ENTRY(_rthal_defer_switch_p)
 	r1 = EVT_IVG15 (z);
         r0 = r0 & r1;
 	cc = r0 == 0;
-	if !cc jump 1f; 
+	if !cc jump 1f;
 #endif /* CONFIG_XENO_OPT_PERVASIVE */
 	p2.l = lo(IPEND);
         p2.h = hi(IPEND);
 	csync;
         r2 = [p2];
-        r1 = 1;
-        r1 = r2 - r1;
+        r1 = LO(~0x13) (Z);
         r0 = r2 & r1;
+        cc = r0 == 0;
+        if cc jump 1f;
+        r1 = 1;
+        r1 = r0 - r1;
+        r0 = r0 & r1;
 1:
 	rts
 
@@ -108,4 +112,4 @@ ENTRY(_rthal_nmi_handler)
 	RESTORE_ALL_SYS
 	rtn; 
 		
-#endif /* CONFIG_XENO_HW_NMI_DEBUG_LATENCY_MAX */
+#endif /* CONFIG_XENO_HW_NMI_DEBUG_LATENCY */

> Kolja
> 
-- 
Philippe.