powerpc/kprobe: Introduce a new thread flag

We need to add a new thread flag, TIF_EMULATE_STACK_STORE,
for emulating stack store operation while exiting exception.

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index e942203..8ceea14 100644 (file)
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -104,6 +104,8 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_NOTIFY_RESUME      13      /* callback before returning to user */
 #define TIF_UPROBE             14      /* breakpointed or single-stepping */
 #define TIF_SYSCALL_TRACEPOINT 15      /* syscall tracepoint instrumentation */
+#define TIF_EMULATE_STACK_STORE        16      /* Is an instruction emulation
+                                               for stack store? */
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE     (1<<TIF_SYSCALL_TRACE)
@@ -121,6 +123,7 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_NOTIFY_RESUME     (1<<TIF_NOTIFY_RESUME)
 #define _TIF_UPROBE            (1<<TIF_UPROBE)
 #define _TIF_SYSCALL_TRACEPOINT        (1<<TIF_SYSCALL_TRACEPOINT)
+#define _TIF_EMULATE_STACK_STORE       (1<<TIF_EMULATE_STACK_STORE)
 #define _TIF_SYSCALL_T_OR_A    (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
                                 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT)