From ba6399334dd8a75bd295de26496196c720abae0a Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 7 Oct 2005 13:30:49 -0700 Subject: [SPARC64]: Fix userland FPU state corruption. We need to use stricter memory barriers around the block load and store instructions we use to save and restore the FPU register file. Signed-off-by: David S. Miller --- arch/sparc64/kernel/rtrap.S | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'arch/sparc64/kernel/rtrap.S') diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S index ecfb42a..090dcca 100644 --- a/arch/sparc64/kernel/rtrap.S +++ b/arch/sparc64/kernel/rtrap.S @@ -312,32 +312,33 @@ kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5 wr %g1, FPRS_FEF, %fprs ldx [%o1 + %o5], %g1 add %g6, TI_XFSR, %o1 - membar #StoreLoad | #LoadLoad sll %o0, 8, %o2 add %g6, TI_FPREGS, %o3 brz,pn %l6, 1f add %g6, TI_FPREGS+0x40, %o4 + membar #Sync ldda [%o3 + %o2] ASI_BLK_P, %f0 ldda [%o4 + %o2] ASI_BLK_P, %f16 + membar #Sync 1: andcc %l2, FPRS_DU, %g0 be,pn %icc, 1f wr %g1, 0, %gsr add %o2, 0x80, %o2 + membar #Sync ldda [%o3 + %o2] ASI_BLK_P, %f32 ldda [%o4 + %o2] ASI_BLK_P, %f48 - 1: membar #Sync ldx [%o1 + %o5], %fsr 2: stb %l5, [%g6 + TI_FPDEPTH] ba,pt %xcc, rt_continue nop 5: wr %g0, FPRS_FEF, %fprs - membar #StoreLoad | #LoadLoad sll %o0, 8, %o2 add %g6, TI_FPREGS+0x80, %o3 add %g6, TI_FPREGS+0xc0, %o4 + membar #Sync ldda [%o3 + %o2] ASI_BLK_P, %f32 ldda [%o4 + %o2] ASI_BLK_P, %f48 membar #Sync -- cgit v1.1