sh: fcnvds fix with denormalized numbers on SH-4 FPU.

This fixes a bug in the FPU exception handler for the FCNVDS instruction.
To get the register number the instruction is shifted right by 9,
though it should be shifted right by 8.

More information at ST Linux bugzilla:

	https://bugzilla.stlinux.com/show_bug.cgi?id=4892

Signed-off-by: Giuseppe Di Giore <giuseppe.di-giore@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/kernel/cpu/sh4/fpu.c b/arch/sh/kernel/cpu/sh4/fpu.c
index 2780917c0088c410491c4729e92727e4ec019d0e..e3ea5411da6d8df6469623005951ef77245ed4fe 100644 (file)
--- a/arch/sh/kernel/cpu/sh4/fpu.c
+++ b/arch/sh/kernel/cpu/sh4/fpu.c
@@ -423,7 +423,7 @@ static int ieee_fpe_handler(struct pt_regs *regs)
                int m;
                unsigned int hx;
 
-               m = (finsn >> 9) & 0x7;
+               m = (finsn >> 8) & 0x7;
                hx = tsk->thread.fpu.hard.fp_regs[m];
 
                if ((tsk->thread.fpu.hard.fpscr & FPSCR_CAUSE_ERROR)