powerpc/math-emu: Use kernel generic math-emu code

The math emulation code is centered around a set of generic macros that
provide the core of the emulation that are shared by the various
architectures and other projects (like glibc).  Each arch implements its
own sfp-machine.h to specific various arch specific details.

For historic reasons that are now lost the powerpc math-emu code had
its own version of the common headers.  This moves us to using the
kernel generic version and thus getting fixes when those are updated.

Also cleaned up exception/error reporting from the FP emulation functions.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 14 insertions, 5 deletions

diff --git a/arch/powerpc/math-emu/lfs.c b/arch/powerpc/math-emu/lfs.c
index 6f18ebe3a7ff..434ed27be8db 100644
--- a/arch/powerpc/math-emu/lfs.c
+++ b/arch/powerpc/math-emu/lfs.c
@@ -2,15 +2,17 @@
 #include <linux/errno.h>
 #include <asm/uaccess.h>
 
-#include "soft-fp.h"
-#include "double.h"
-#include "single.h"
+#include <asm/sfp-machine.h>
+#include <math-emu/soft-fp.h>
+#include <math-emu/double.h>
+#include <math-emu/single.h>
 
 int
 lfs(void *frD, void *ea)
 {
 	FP_DECL_D(R);
 	FP_DECL_S(A);
+	FP_DECL_EX;
 	float f;
 
 #ifdef DEBUG
@@ -20,7 +22,7 @@ lfs(void *frD, void *ea)
 	if (copy_from_user(&f, ea, sizeof(float)))
 		return -EFAULT;
 
-	__FP_UNPACK_S(A, &f);
+	FP_UNPACK_S(A, f);
 
 #ifdef DEBUG
 	printk("A: %ld %lu %ld (%ld) [%08lx]\n", A_s, A_f, A_e, A_c,
@@ -33,5 +35,12 @@ lfs(void *frD, void *ea)
 	printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
 #endif
 
-	return __FP_PACK_D(frD, R);
+	if (R_c == FP_CLS_NAN) {
+		R_e = _FP_EXPMAX_D;
+		_FP_PACK_RAW_2_P(D, frD, R);
+	} else {
+		__FP_PACK_D(frD, R);
+	}
+
+	return 0;
 }