From: Stepan Moskovchenko <[email protected]> Certain ARM CPU implementations (e.g. Cortex-A15) may not raise a floating- point exception whenever deprecated short-vector VFP instructions are executed. Instead these instructions are treated as UNALLOCATED. Change the VFP exception handling code to emulate short-vector instructions even if FPEXC exception bits are not set.
Signed-off-by: Stepan Moskovchenko <[email protected]> Tested-by: Will Deacon <[email protected]> Signed-off-by: Stephen Boyd <[email protected]> --- arch/arm/vfp/vfphw.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S index cda654cbf2c2..f74a8f7e5f84 100644 --- a/arch/arm/vfp/vfphw.S +++ b/arch/arm/vfp/vfphw.S @@ -197,6 +197,12 @@ look_for_VFP_exceptions: tst r5, #FPSCR_IXE bne process_exception + tst r5, #FPSCR_LENGTH_MASK + beq skip + orr r1, r1, #FPEXC_DEX + b process_exception +skip: + @ Fall into hand on to next handler - appropriate coproc instr @ not recognised by VFP -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
