add new si_lower and si_upper siginfo_t members

new in linux v3.19 commit ee1b58d36aa1b5a79eaba11f5c3633c88231da83
used to report intel mpx bound violation information.

include/signal.h

@@ -63,6 +63,7 @@ extern "C" {
 
 #define SEGV_MAPERR 1
 #define SEGV_ACCERR 2
+#define SEGV_BNDERR 3
 
 #define BUS_ADRALN 1
 #define BUS_ADRERR 2
@@ -110,6 +111,10 @@ typedef struct {
 		struct {
 			void *si_addr;
 			short si_addr_lsb;
+			struct {
+				void *si_lower;
+				void *si_upper;
+			} __addr_bnd;
 		} __sigfault;
 		struct {
 			long si_band;
@@ -130,6 +135,8 @@ typedef struct {
 #define si_value   __si_fields.__si_common.__second.si_value
 #define si_addr    __si_fields.__sigfault.si_addr
 #define si_addr_lsb __si_fields.__sigfault.si_addr_lsb
+#define si_lower   __si_fields.__sigfault.__addr_bnd.si_lower
+#define si_upper   __si_fields.__sigfault.__addr_bnd.si_upper
 #define si_band    __si_fields.__sigpoll.si_band
 #define si_fd      __si_fields.__sigpoll.si_fd
 #define si_timerid __si_fields.__si_common.__first.__timer.si_timerid