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fixed horrible python ARM bug

--- a/sys/src/cmd/python/plan9.c

+++ b/sys/src/cmd/python/plan9.c

@@ -4,14 +4,6 @@

 #include <u.h>

 #include <lib9.h>

-#if defined(T386)

-#define	FPINVAL	(1<<0)

-#elif defined(Tarm)

-#define FPINVAL (1<<16)

-#else

-Error define FPINVAL for your arch. grep /$cputype/include/u.h

-#endif

-

 Threadarg *_threadarg;

 extern DL_EXPORT(int) Py_Main(int, char **);

@@ -21,7 +13,14 @@

 {

 	Threadarg ta;

-	setfcr(getfcr()&~FPINVAL);

+#if defined(T386)

+	setfcr(getfcr()&~(1<<0));

+#elif defined(Tarm)

+	setfsr(getfsr()&~(1<<16));

+#else

+Error define code for disabling fp exceptions for your arch.

+#endif

+

 	memset(&ta, 0, sizeof ta);

 	_threadarg = &ta;

 	if(setjmp(ta.jb)){

-- 

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