parasite: add macro for getting IP register

This patch adds macro for getting IP register which differs according to
architecture.
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Acked-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/arm/include/asm/restorer.h

@@ -124,6 +124,7 @@ struct rt_sigframe {
 
 
 #define RT_SIGFRAME_UC(rt_sigframe) rt_sigframe->sig.uc
+#define RT_SIGFRAME_REGIP(rt_sigframe) (rt_sigframe)->sig.uc.uc_mcontext.arm_ip
 
 #define SIGFRAME_OFFSET 0
 

arch/x86/include/asm/restorer.h

@@ -131,6 +131,7 @@ struct rt_sigframe {
 		     : "memory")
 
 #define RT_SIGFRAME_UC(rt_sigframe) rt_sigframe->uc
+#define RT_SIGFRAME_REGIP(rt_sigframe) (rt_sigframe)->uc.uc_mcontext.rip
 
 #define SIGFRAME_OFFSET 8
 

pie/parasite.c

@@ -441,7 +441,7 @@ static int fini()
 
 	new_sp = (long)sigframe + SIGFRAME_OFFSET;
 	pr_debug("%ld: new_sp=%lx ip %lx\n", sys_gettid(),
-		  new_sp, sigframe->uc.uc_mcontext.rip);
+		  new_sp, RT_SIGFRAME_REGIP(sigframe));
 
 	sys_close(tsock);
 	log_set_fd(-1);