[ARM] 3664/1: crunch: add signal frame save/restore
Patch from Lennert Buytenhek
This patch makes the kernel save Crunch state in userland signal frames,
so that any userland signal handler can safely use the Crunch coprocessor
without corrupting the Crunch state of the code it preempted.
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/include/asm-arm/ucontext.h b/include/asm-arm/ucontext.h
index 9e6f7ca..bf65e9f 100644
--- a/include/asm-arm/ucontext.h
+++ b/include/asm-arm/ucontext.h
@@ -35,6 +35,17 @@
* bytes, to prevent unpredictable padding in the signal frame.
*/
+#ifdef CONFIG_CRUNCH
+#define CRUNCH_MAGIC 0x5065cf03
+#define CRUNCH_STORAGE_SIZE (CRUNCH_SIZE + 8)
+
+struct crunch_sigframe {
+ unsigned long magic;
+ unsigned long size;
+ struct crunch_state storage;
+} __attribute__((__aligned__(8)));
+#endif
+
#ifdef CONFIG_IWMMXT
/* iwmmxt_area is 0x98 bytes long, preceeded by 8 bytes of signature */
#define IWMMXT_MAGIC 0x12ef842a
@@ -74,6 +85,9 @@
* one of these.
*/
struct aux_sigframe {
+#ifdef CONFIG_CRUNCH
+ struct crunch_sigframe crunch;
+#endif
#ifdef CONFIG_IWMMXT
struct iwmmxt_sigframe iwmmxt;
#endif