parisc: clear floating point exception flag on SIGFPE signal

commit 550f0d922286556c7ea43974bb7921effb5a5278 upstream.

Clear the floating point exception flag before returning to
user space. This is needed, else the libc trampoline handler
may hit the same SIGFPE again while building up a trampoline
to a signal handler.

Fixes debian bug #559406.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/parisc/math-emu/decode_exc.c b/arch/parisc/math-emu/decode_exc.c
index 66c8a9f6a27eba49f17798873e97419a6104c282..62ebcde980cfbcddd95e8ef6f918f0f65a7da18a 100644 (file)
--- a/arch/parisc/math-emu/decode_exc.c
+++ b/arch/parisc/math-emu/decode_exc.c
@@ -342,6 +342,7 @@ decode_fpu(unsigned int Fpu_register[], unsigned int trap_counts[])
                return SIGNALCODE(SIGFPE, FPE_FLTINV);
          case DIVISIONBYZEROEXCEPTION:
                update_trap_counts(Fpu_register, aflags, bflags, trap_counts);
+               Clear_excp_register(exception_index);
                return SIGNALCODE(SIGFPE, FPE_FLTDIV);
          case INEXACTEXCEPTION:
                update_trap_counts(Fpu_register, aflags, bflags, trap_counts);