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

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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>
This commit is contained in:
George G. Davis 2006-05-05 22:32:23 +01:00 committed by Russell King
parent 2eb9d31571
commit b7d7ef87e1
1 changed files with 1 additions and 1 deletions
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2
arch/arm/vfp/vfpmodule.c
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@ -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);