restorer: introduced the macro RT_SIGFRAME_UC to access the user context of a sigframe

Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/x86/include/asm/restorer.h

@@ -129,6 +129,8 @@ struct rt_sigframe {
 		     : "r"(ret)					\
 		     : "memory")
 
+#define RT_SIGFRAME_UC(rt_sigframe) rt_sigframe->uc
+
 
 int restore_gpregs(struct rt_sigframe *f, UserX86RegsEntry *r);
 

pie/restorer.c

@@ -164,7 +164,7 @@ static int restore_thread_common(struct rt_sigframe *sigframe,
 	}
 
 	if (args->has_blk_sigset)
-		sigframe->uc.uc_sigmask.sig[0] = args->blk_sigset;
+		RT_SIGFRAME_UC(sigframe).uc_sigmask.sig[0] = args->blk_sigset;
 
 	restore_sched_info(&args->sp);
 	if (restore_fpu(sigframe, args))