ARM: be strict about FP exceptions in kernel mode

[deliverable/linux.git] / arch / arm / vfp / vfphw.S

diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S
index 8d10dc8a1e17b34776a366f4b71fcca68c21bf8a..3e5d3115a2a6847ee41fc3d6d23ffde8fa0a7917 100644 (file)
--- a/arch/arm/vfp/vfphw.S
+++ b/arch/arm/vfp/vfphw.S
@@ -78,6 +78,11 @@
 ENTRY(vfp_support_entry)
        DBGSTR3 "instr %08x pc %08x state %p", r0, r2, r10
 
+       ldr     r3, [sp, #S_PSR]        @ Neither lazy restore nor FP exceptions
+       and     r3, r3, #MODE_MASK      @ are supported in kernel mode
+       teq     r3, #USR_MODE
+       bne     vfp_kmode_exception     @ Returns through lr
+
        VFPFMRX r1, FPEXC               @ Is the VFP enabled?
        DBGSTR1 "fpexc %08x", r1
        tst     r1, #FPEXC_EN