[PATCH v3 2/2] ARM: vfp: clear fpscr length and stride bits on entry to sig handler

[will.deacon@arm.com (Will Deacon)]

The ARM PCS mandates that the length and stride bits of the fpscr are
cleared on entry to and return from a public interface. Although signal
handlers run asynchronously with respect to the interrupted function,
the handler itself expects to run as though it has been called like a
normal function.

This patch updates the state mirroring the VFP hardware before entry to
a signal handler so that it adheres to the PCS. Furthermore, we disable
VFP to ensure that we trap on any floating point operation performed by
the signal handler and synchronise the hardware appropriately. A check
is inserted after the signal handler to avoid redundant flushing if VFP
was not used.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---
 arch/arm/vfp/vfpmodule.c |   22 +++++++++++++++++++++-
 1 files changed, 21 insertions(+), 1 deletions(-)

diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index 3e35e35..49cf328 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -562,6 +562,21 @@ int vfp_preserve_user_hwstate(struct user_vfp __user *ufp,
 
 	if (err)
 		return -EFAULT;
+
+	/* Ensure that VFP is disabled. */
+	vfp_flush_hwstate(thread);
+
+	/*
+	 * As per the PCS, clear the length and stride bits before entry
+	 * to the signal handler.
+	 */
+	hwstate->fpscr &= ~(FPSCR_LENGTH_MASK | FPSCR_STRIDE_MASK);
+
+	/*
+	 * Disable VFP in the hwstate so that we can detect if it was
+	 * used by the signal handler.
+	 */
+	hwstate->fpexc &= ~FPEXC_EN;
 	return 0;
 }
 
@@ -574,7 +589,12 @@ int vfp_restore_user_hwstate(struct user_vfp __user *ufp,
 	unsigned long fpexc;
 	int err = 0;
 
-	vfp_flush_hwstate(thread);
+	/*
+	 * If VFP has been used, then disable it to avoid corrupting
+	 * the new thread state.
+	 */
+	if (hwstate->fpexc & FPEXC_EN)
+		vfp_flush_hwstate(thread);
 
 	/*
 	 * Copy the floating point registers. There can be unused
-- 
1.7.4.1