Commit b7d7ef87 authored May 05, 2006 by George G. Davis Committed by Russell King May 05, 2006

[ARM] 3499/1: Fix VFP FPSCR corruption for double exception case



Patch from George G. Davis

The ARM VFP FPSCR register is corrupted when a condition flags modifying
VFP instruction is followed by a non-condition flags modifying VFP
instruction and both instructions raise exceptions.  The fix is to
read the current FPSCR in between emulation of these two instructions
and use the current FPSCR value when handling the second exception.

Signed-off-by: George G. Davis <gdavis@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 2eb9d315

arch/arm/vfp/vfpmodule.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -245,7 +245,7 @@ void VFP9_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs)
		*/
		barrier();
		trigger = fmrx(FPINST2);
		fpscr = fmrx(FPSCR);
		orig_fpscr = fpscr = fmrx(FPSCR);

		emulate:
		exceptions = vfp_emulate_instruction(trigger, fpscr, regs);

Admin message