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Date:	Tue, 14 Oct 2014 06:48:59 -0700
From:	Stephen Boyd <>
To:	Russell King <>
Cc:	Stepan Moskovchenko <>,,,,
	Will Deacon <>,
	Rob Clark <>
Subject: [PATCH v2 3/3] arm: vfp: Bounce undefined instructions in vectored mode

From: Stepan Moskovchenko <>

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

Signed-off-by: Stepan Moskovchenko <>
Tested-by: Will Deacon <>
Signed-off-by: Stephen Boyd <>
 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
+	beq	skip
+	orr	r1, r1, #FPEXC_DEX
+	b	process_exception
 	@ Fall into hand on to next handler - appropriate coproc instr
 	@ not recognised by VFP
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