Add si_addr_bnd to _sigfault in x86 struct siginfo

X86 struct siginfo in kernel 3.19 has been changed by

commit ee1b58d36aa1b5a79eaba11f5c3633c88231da83
Author: Qiaowei Ren <qiaowei.ren@intel.com>
Date:   Fri Nov 14 07:18:19 2014 -0800

    mpx: Extend siginfo structure to include bound violation information

    This patch adds new fields about bound violation into siginfo
    structure. si_lower and si_upper are respectively lower bound
    and upper bound when bound violation is caused.

This patch updates x86 struct siginfo to enable GDB with MPX support.

	[BZ #18696]
	* sysdeps/unix/sysv/linux/x86/bits/siginfo.h (_sigfault): Add
	si_addr_bnd.
	(si_lower): New.
	(si_upper): Likewise.

ChangeLog

@@ -1,3 +1,11 @@
+2015-07-20  H.J. Lu  <hongjiu.lu@intel.com>
+
+	[BZ #18696]
+	* sysdeps/unix/sysv/linux/x86/bits/siginfo.h (_sigfault): Add
+	si_addr_bnd.
+	(si_lower): New.
+	(si_upper): Likewise.
+
 2015-07-16  David S. Miller  <davem@davemloft.net>
 
 	* sysdeps/sparc/fpu/libm-test-ulps: Regenerated.

NEWS

@@ -27,7 +27,7 @@ Version 2.22
   18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534, 18536, 18539,
   18540, 18542, 18544, 18545, 18546, 18547, 18549, 18553, 18557, 18558,
   18569, 18583, 18585, 18586, 18592, 18593, 18594, 18602, 18612, 18613,
-  18619, 18633, 18641, 18643, 18648, 18676.
+  18619, 18633, 18641, 18643, 18648, 18676, 18696.
 
 * Cache information can be queried via sysconf() function on s390 e.g. with
   _SC_LEVEL1_ICACHE_SIZE as argument.

sysdeps/unix/sysv/linux/x86/bits/siginfo.h

@@ -108,6 +108,11 @@ typedef struct
 	  {
 	    void *si_addr;	/* Faulting insn/memory ref.  */
 	    short int si_addr_lsb;	/* Valid LSB of the reported address.  */
+	    struct
+	      {
+		void *_lower;
+		void *_upper;
+	      } si_addr_bnd;
 	  } _sigfault;
 
 	/* SIGPOLL.  */
@@ -141,6 +146,8 @@ typedef struct
 # define si_ptr		_sifields._rt.si_sigval.sival_ptr
 # define si_addr	_sifields._sigfault.si_addr
 # define si_addr_lsb	_sifields._sigfault.si_addr_lsb
+# define si_lower	_sifields._sigfault.si_addr_bnd._lower
+# define si_upper	_sifields._sigfault.si_addr_bnd._upper
 # define si_band	_sifields._sigpoll.si_band
 # define si_fd		_sifields._sigpoll.si_fd
 # define si_call_addr 	_sifields._sigsys._call_addr