Re: [PATCH, MPX runtime 1/2] Integrate MPX runtime library

[Ilya Enkovich <enkovich dot gnu at gmail dot com>]

On 21 Nov 23:20, Joseph Myers wrote:
> On Fri, 21 Nov 2014, Ilya Enkovich wrote:
> 
> > +# Disable libmpx on unsupported systems.
> > +if test -d ${srcdir}/libmpx; then
> > +    if test x$enable_libmpx = x; then
> > +       AC_MSG_CHECKING([for libmpx support])
> > +       if (srcdir=${srcdir}/libmpx; \
> > +               . ${srcdir}/configure.tgt; \
> > +               test "$LIBMPX_SUPPORTED" != "yes")
> > +       then
> > +           AC_MSG_RESULT([no])
> > +           noconfigdirs="$noconfigdirs target-libmpx"
> > +       else
> > +           AC_MSG_RESULT([yes])
> > +       fi
> > +    fi
> > +fi
> 
> Using this at toplevel you can only enable or disable for all multilibs - 
> this code runs just once.  But:
> 
> > diff --git a/libmpx/configure.tgt b/libmpx/configure.tgt
> 
> > +LIBMPX_SUPPORTED=no
> > +case "${target}" in
> > +  x86_64-*-linux* | i?86-*-linux*)
> > +	# X32 doesn't support MPX.
> > +	echo "int i[sizeof (void *) == 4 ? 1 : -1] = { __x86_64__ };" > conftestx.c
> > +	if ${CC} ${CFLAGS} -c -o conftestx.o conftestx.c > /dev/null 2>&1; then
> > +		LIBMPX_SUPPORTED=no
> > +	else
> > +		LIBMPX_SUPPORTED=yes
> > +	fi
> > +	;;
> 
> Here you are testing something per-multilib.  Furthermore, using CC and 
> CFLAGS here is wrong when used by toplevel configure, as at toplevel 
> they'll relate to the host rather than the target.
> 
> So you need to separate the two tests of (a) might MPX be supported for 
> some multilib on the target (usable at toplevel, not using CC or CFLAGS) 
> and (b) is it supported for the present multilib.  Thus the libmpx 
> directory will need configuring for all multilibs for supported targets.  
> Then, if the particular multilib doesn't support it (i.e. is x32), you'll 
> need to arrange for the directory not to build or install anything - much 
> like the libquadmath directory gets configured in some cases where it 
> doesn't build anything.

Right.  This works for both top level and multilib checks because failing test is used and CC is usually not set when it's called by the top level configure.  If we configure with CC=... then it may go wrong.  I left only target check in configure.tgt and inlined test for x32 into libmpx configure.

> 
> -- 
> Joseph S. Myers
> joseph@codesourcery.com

Here is an updated version.

Thanks,
Ilya
--
diff --git a/Makefile.def b/Makefile.def
index 40bbca9..4a535d2 100644
--- a/Makefile.def
+++ b/Makefile.def
@@ -128,6 +128,9 @@ target_modules = { module= libsanitizer;
 		   bootstrap=true;
 		   lib_path=.libs;
 		   raw_cxx=true; };
+target_modules = { module= libmpx;
+		   bootstrap=true;
+		   lib_path=.libs; };
 target_modules = { module= libvtv;
 		   bootstrap=true;
 		   lib_path=.libs;
diff --git a/configure.ac b/configure.ac
index b27fb1d..ccb119b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -162,6 +162,7 @@ target_libraries="target-libgcc \
 		target-libstdc++-v3 \
 		target-libsanitizer \
 		target-libvtv \
+		target-libmpx \
 		target-libssp \
 		target-libquadmath \
 		target-libgfortran \
@@ -642,6 +643,25 @@ if test -d ${srcdir}/libvtv; then
     fi
 fi
 
+
+# Disable libmpx on unsupported systems.
+if test -d ${srcdir}/libmpx; then
+    if test x$enable_libmpx = x; then
+       AC_MSG_CHECKING([for libmpx support])
+       if (srcdir=${srcdir}/libmpx; \
+               . ${srcdir}/configure.tgt; \
+               test "$LIBMPX_SUPPORTED" != "yes")
+       then
+           AC_MSG_RESULT([no])
+           noconfigdirs="$noconfigdirs target-libmpx"
+       else
+           AC_MSG_RESULT([yes])
+       fi
+    fi
+fi
+
+
+
 # Disable libquadmath for some systems.
 case "${target}" in
   avr-*-*)
@@ -2652,6 +2672,11 @@ if echo " ${target_configdirs} " | grep " libvtv " > /dev/null 2>&1 &&
   bootstrap_target_libs=${bootstrap_target_libs}target-libvtv,
 fi
 
+# If we are building libmpx, bootstrap it.
+if echo " ${target_configdirs} " | grep " libmpx " > /dev/null 2>&1; then
+  bootstrap_target_libs=${bootstrap_target_libs}target-libmpx,
+fi
+
 # Determine whether gdb needs tk/tcl or not.
 # Use 'maybe' since enable_gdbtk might be true even if tk isn't available
 # and in that case we want gdb to be built without tk.  Ugh!
diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
index 85dcb98..8f5d76c 100644
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -1040,6 +1040,9 @@ fchkp-instrument-marked-only
 C ObjC C++ ObjC++ LTO Report Var(flag_chkp_instrument_marked_only) Init(0)
 Instrument only functions marked with bnd_instrument attribute.
 
+static-libmpx
+Driver
+
 fcilkplus
 C ObjC C++ ObjC++ LTO Report Var(flag_cilkplus) Init(0)
 Enable Cilk Plus
diff --git a/gcc/config/i386/cpuid.h b/gcc/config/i386/cpuid.h
index 133e356..f85cebb 100644
--- a/gcc/config/i386/cpuid.h
+++ b/gcc/config/i386/cpuid.h
@@ -72,6 +72,7 @@
 #define bit_AVX2	(1 << 5)
 #define bit_BMI2	(1 << 8)
 #define bit_RTM	(1 << 11)
+#define bit_MPX	(1 << 14)
 #define bit_AVX512F	(1 << 16)
 #define bit_AVX512DQ	(1 << 17)
 #define bit_RDSEED	(1 << 18)
@@ -87,6 +88,10 @@
 /* %ecx */
 #define bit_PREFETCHWT1	  (1 << 0)
 
+/* XFEATURE_ENABLED_MASK register bits (%eax == 13, %ecx == 0) */
+#define bit_BNDREGS     (1 << 3)
+#define bit_BNDCSR      (1 << 4)
+
 /* Extended State Enumeration Sub-leaf (%eax == 13, %ecx == 1) */
 #define bit_XSAVEOPT	(1 << 0)
 #define bit_XSAVEC	(1 << 1)
diff --git a/gcc/gcc.c b/gcc/gcc.c
index 653ca8d..75e5767 100644
--- a/gcc/gcc.c
+++ b/gcc/gcc.c
@@ -809,6 +809,30 @@ proper position among the other output files.  */
     %{fvtable-verify=preinit: -lvtv -u_vtable_map_vars_start -u_vtable_map_vars_end}}"
 #endif
 
+#ifndef LIBMPX_LIBS
+#define LIBMPX_LIBS "\
+ %:include(libmpx.spec)%(link_libmpx)"
+#endif
+
+#ifndef LIBMPX_SPEC
+#if defined(HAVE_LD_STATIC_DYNAMIC)
+#define LIBMPX_SPEC "\
+%{mmpx:%{fcheck-pointer-bounds:\
+    %{static:--whole-archive -lmpx --no-whole-archive" LIBMPX_LIBS "}\
+    %{!static:%{static-libmpx:" LD_STATIC_OPTION " --whole-archive}\
+    -lmpx %{static-libmpx:--no-whole-archive " LD_DYNAMIC_OPTION \
+    LIBMPX_LIBS "}}}}"
+#else
+#define LIBMPX_SPEC "\
+%{mmpx:%{fcheck-pointer-bounds:-lmpx" LIBMPX_LIBS "}}"
+#endif
+#endif
+
+#ifndef MPX_SPEC
+#define MPX_SPEC "\
+%{!nostdlib:%{!nodefaultlibs:" LIBMPX_SPEC "}}"
+#endif
+
 /* -u* was put back because both BSD and SysV seem to support it.  */
 /* %{static:} simply prevents an error message if the target machine
    doesn't handle -static.  */
@@ -829,6 +853,7 @@ proper position among the other output files.  */
    "%X %{o*} %{e*} %{N} %{n} %{r}\
     %{s} %{t} %{u*} %{z} %{Z} %{!nostdlib:%{!nostartfiles:%S}} " VTABLE_VERIFICATION_SPEC " \
     %{static:} %{L*} %(mfwrap) %(link_libgcc) " SANITIZER_EARLY_SPEC " %o\
+    " MPX_SPEC " \
     %{fopenmp|ftree-parallelize-loops=*:%:include(libgomp.spec)%(link_gomp)}\
     %{fcilkplus:%:include(libcilkrts.spec)%(link_cilkrts)}\
     %{fgnu-tm:%:include(libitm.spec)%(link_itm)}\
diff --git a/libmpx/ChangeLog b/libmpx/ChangeLog
new file mode 100644
index 0000000..2e2ea92
--- /dev/null
+++ b/libmpx/ChangeLog
@@ -0,0 +1,3 @@
+2014-11-10  Ilya Enkovich  <ilya.enkovich@intel.com>
+
+	Initial checkin.
diff --git a/libmpx/Makefile.am b/libmpx/Makefile.am
new file mode 100644
index 0000000..6cee4ac
--- /dev/null
+++ b/libmpx/Makefile.am
@@ -0,0 +1,47 @@
+ACLOCAL_AMFLAGS = -I .. -I ../config
+
+if LIBMPX_SUPPORTED
+SUBDIRS = mpxrt
+nodist_toolexeclib_HEADERS = libmpx.spec
+endif
+
+## May be used by toolexeclibdir.
+gcc_version := $(shell cat $(top_srcdir)/../gcc/BASE-VER)
+
+# Work around what appears to be a GNU make bug handling MAKEFLAGS
+# values defined in terms of make variables, as is the case for CC and
+# friends when we are called from the top level Makefile.
+AM_MAKEFLAGS = \
+	"AR_FLAGS=$(AR_FLAGS)" \
+	"CC_FOR_BUILD=$(CC_FOR_BUILD)" \
+	"CFLAGS=$(CFLAGS)" \
+	"CXXFLAGS=$(CXXFLAGS)" \
+	"CFLAGS_FOR_BUILD=$(CFLAGS_FOR_BUILD)" \
+	"CFLAGS_FOR_TARGET=$(CFLAGS_FOR_TARGET)" \
+	"INSTALL=$(INSTALL)" \
+	"INSTALL_DATA=$(INSTALL_DATA)" \
+	"INSTALL_PROGRAM=$(INSTALL_PROGRAM)" \
+	"INSTALL_SCRIPT=$(INSTALL_SCRIPT)" \
+	"JC1FLAGS=$(JC1FLAGS)" \
+	"LDFLAGS=$(LDFLAGS)" \
+	"LIBCFLAGS=$(LIBCFLAGS)" \
+	"LIBCFLAGS_FOR_TARGET=$(LIBCFLAGS_FOR_TARGET)" \
+	"MAKE=$(MAKE)" \
+	"MAKEINFO=$(MAKEINFO) $(MAKEINFOFLAGS)" \
+	"PICFLAG=$(PICFLAG)" \
+	"PICFLAG_FOR_TARGET=$(PICFLAG_FOR_TARGET)" \
+	"SHELL=$(SHELL)" \
+	"RUNTESTFLAGS=$(RUNTESTFLAGS)" \
+	"exec_prefix=$(exec_prefix)" \
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+	"DESTDIR=$(DESTDIR)"
diff --git a/libmpx/acinclude.m4 b/libmpx/acinclude.m4
new file mode 100644
index 0000000..38e0808
--- /dev/null
+++ b/libmpx/acinclude.m4
@@ -0,0 +1,12 @@
+dnl ----------------------------------------------------------------------
+dnl This whole bit snagged from libgfortran.
+
+sinclude(../libtool.m4)
+dnl The lines below arrange for aclocal not to bring an installed
+dnl libtool.m4 into aclocal.m4, while still arranging for automake to
+dnl add a definition of LIBTOOL to Makefile.in.
+ifelse(,,,[AC_SUBST(LIBTOOL)
+AC_DEFUN([AM_PROG_LIBTOOL])
+AC_DEFUN([AC_LIBTOOL_DLOPEN])
+AC_DEFUN([AC_PROG_LD])
+])
diff --git a/libmpx/aclocal.m4 b/libmpx/aclocal.m4
new file mode 100644
index 0000000..029586b
--- /dev/null
+++ b/libmpx/aclocal.m4
@@ -0,0 +1,701 @@
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+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
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+  [AM_CONDITIONAL([am__EXEEXT], [test -n "$EXEEXT"])])])dnl
+])
+
+dnl Hook into `_AC_COMPILER_EXEEXT' early to learn its expansion.  Do not
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+m4_define([_AC_COMPILER_EXEEXT],
+m4_defn([_AC_COMPILER_EXEEXT])[m4_provide([_AM_COMPILER_EXEEXT])])
+
+
+# When config.status generates a header, we must update the stamp-h file.
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+# that is generated.  The stamp files are numbered to have different names.
+
+# Autoconf calls _AC_AM_CONFIG_HEADER_HOOK (when defined) in the
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+# our stamp files there.
+AC_DEFUN([_AC_AM_CONFIG_HEADER_HOOK],
+[# Compute $1's index in $config_headers.
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+    $_am_arg | $_am_arg:* )
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+    * )
+      _am_stamp_count=`expr $_am_stamp_count + 1` ;;
+  esac
+done
+echo "timestamp for $_am_arg" >`AS_DIRNAME(["$_am_arg"])`/stamp-h[]$_am_stamp_count])
+
+# Copyright (C) 2001, 2003, 2005, 2008  Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# AM_PROG_INSTALL_SH
+# ------------------
+# Define $install_sh.
+AC_DEFUN([AM_PROG_INSTALL_SH],
+[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
+if test x"${install_sh}" != xset; then
+  case $am_aux_dir in
+  *\ * | *\	*)
+    install_sh="\${SHELL} '$am_aux_dir/install-sh'" ;;
+  *)
+    install_sh="\${SHELL} $am_aux_dir/install-sh"
+  esac
+fi
+AC_SUBST(install_sh)])
+
+# Add --enable-maintainer-mode option to configure.         -*- Autoconf -*-
+# From Jim Meyering
+
+# Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2008
+# Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 5
+
+# AM_MAINTAINER_MODE([DEFAULT-MODE])
+# ----------------------------------
+# Control maintainer-specific portions of Makefiles.
+# Default is to disable them, unless `enable' is passed literally.
+# For symmetry, `disable' may be passed as well.  Anyway, the user
+# can override the default with the --enable/--disable switch.
+AC_DEFUN([AM_MAINTAINER_MODE],
+[m4_case(m4_default([$1], [disable]),
+       [enable], [m4_define([am_maintainer_other], [disable])],
+       [disable], [m4_define([am_maintainer_other], [enable])],
+       [m4_define([am_maintainer_other], [enable])
+        m4_warn([syntax], [unexpected argument to AM@&t@_MAINTAINER_MODE: $1])])
+AC_MSG_CHECKING([whether to am_maintainer_other maintainer-specific portions of Makefiles])
+  dnl maintainer-mode's default is 'disable' unless 'enable' is passed
+  AC_ARG_ENABLE([maintainer-mode],
+[  --][am_maintainer_other][-maintainer-mode  am_maintainer_other make rules and dependencies not useful
+			  (and sometimes confusing) to the casual installer],
+      [USE_MAINTAINER_MODE=$enableval],
+      [USE_MAINTAINER_MODE=]m4_if(am_maintainer_other, [enable], [no], [yes]))
+  AC_MSG_RESULT([$USE_MAINTAINER_MODE])
+  AM_CONDITIONAL([MAINTAINER_MODE], [test $USE_MAINTAINER_MODE = yes])
+  MAINT=$MAINTAINER_MODE_TRUE
+  AC_SUBST([MAINT])dnl
+]
+)
+
+AU_DEFUN([jm_MAINTAINER_MODE], [AM_MAINTAINER_MODE])
+
+# Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2008
+# Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 6
+
+# AM_PROG_CC_C_O
+# --------------
+# Like AC_PROG_CC_C_O, but changed for automake.
+AC_DEFUN([AM_PROG_CC_C_O],
+[AC_REQUIRE([AC_PROG_CC_C_O])dnl
+AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
+AC_REQUIRE_AUX_FILE([compile])dnl
+# FIXME: we rely on the cache variable name because
+# there is no other way.
+set dummy $CC
+am_cc=`echo $[2] | sed ['s/[^a-zA-Z0-9_]/_/g;s/^[0-9]/_/']`
+eval am_t=\$ac_cv_prog_cc_${am_cc}_c_o
+if test "$am_t" != yes; then
+   # Losing compiler, so override with the script.
+   # FIXME: It is wrong to rewrite CC.
+   # But if we don't then we get into trouble of one sort or another.
+   # A longer-term fix would be to have automake use am__CC in this case,
+   # and then we could set am__CC="\$(top_srcdir)/compile \$(CC)"
+   CC="$am_aux_dir/compile $CC"
+fi
+dnl Make sure AC_PROG_CC is never called again, or it will override our
+dnl setting of CC.
+m4_define([AC_PROG_CC],
+          [m4_fatal([AC_PROG_CC cannot be called after AM_PROG_CC_C_O])])
+])
+
+# Fake the existence of programs that GNU maintainers use.  -*- Autoconf -*-
+
+# Copyright (C) 1997, 1999, 2000, 2001, 2003, 2004, 2005, 2008
+# Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 6
+
+# AM_MISSING_PROG(NAME, PROGRAM)
+# ------------------------------
+AC_DEFUN([AM_MISSING_PROG],
+[AC_REQUIRE([AM_MISSING_HAS_RUN])
+$1=${$1-"${am_missing_run}$2"}
+AC_SUBST($1)])
+
+
+# AM_MISSING_HAS_RUN
+# ------------------
+# Define MISSING if not defined so far and test if it supports --run.
+# If it does, set am_missing_run to use it, otherwise, to nothing.
+AC_DEFUN([AM_MISSING_HAS_RUN],
+[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
+AC_REQUIRE_AUX_FILE([missing])dnl
+if test x"${MISSING+set}" != xset; then
+  case $am_aux_dir in
+  *\ * | *\	*)
+    MISSING="\${SHELL} \"$am_aux_dir/missing\"" ;;
+  *)
+    MISSING="\${SHELL} $am_aux_dir/missing" ;;
+  esac
+fi
+# Use eval to expand $SHELL
+if eval "$MISSING --run true"; then
+  am_missing_run="$MISSING --run "
+else
+  am_missing_run=
+  AC_MSG_WARN([`missing' script is too old or missing])
+fi
+])
+
+# Copyright (C) 2003, 2004, 2005, 2006  Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# AM_PROG_MKDIR_P
+# ---------------
+# Check for `mkdir -p'.
+AC_DEFUN([AM_PROG_MKDIR_P],
+[AC_PREREQ([2.60])dnl
+AC_REQUIRE([AC_PROG_MKDIR_P])dnl
+dnl Automake 1.8 to 1.9.6 used to define mkdir_p.  We now use MKDIR_P,
+dnl while keeping a definition of mkdir_p for backward compatibility.
+dnl @MKDIR_P@ is magic: AC_OUTPUT adjusts its value for each Makefile.
+dnl However we cannot define mkdir_p as $(MKDIR_P) for the sake of
+dnl Makefile.ins that do not define MKDIR_P, so we do our own
+dnl adjustment using top_builddir (which is defined more often than
+dnl MKDIR_P).
+AC_SUBST([mkdir_p], ["$MKDIR_P"])dnl
+case $mkdir_p in
+  [[\\/$]]* | ?:[[\\/]]*) ;;
+  */*) mkdir_p="\$(top_builddir)/$mkdir_p" ;;
+esac
+])
+
+# Helper functions for option handling.                     -*- Autoconf -*-
+
+# Copyright (C) 2001, 2002, 2003, 2005, 2008  Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 4
+
+# _AM_MANGLE_OPTION(NAME)
+# -----------------------
+AC_DEFUN([_AM_MANGLE_OPTION],
+[[_AM_OPTION_]m4_bpatsubst($1, [[^a-zA-Z0-9_]], [_])])
+
+# _AM_SET_OPTION(NAME)
+# ------------------------------
+# Set option NAME.  Presently that only means defining a flag for this option.
+AC_DEFUN([_AM_SET_OPTION],
+[m4_define(_AM_MANGLE_OPTION([$1]), 1)])
+
+# _AM_SET_OPTIONS(OPTIONS)
+# ----------------------------------
+# OPTIONS is a space-separated list of Automake options.
+AC_DEFUN([_AM_SET_OPTIONS],
+[m4_foreach_w([_AM_Option], [$1], [_AM_SET_OPTION(_AM_Option)])])
+
+# _AM_IF_OPTION(OPTION, IF-SET, [IF-NOT-SET])
+# -------------------------------------------
+# Execute IF-SET if OPTION is set, IF-NOT-SET otherwise.
+AC_DEFUN([_AM_IF_OPTION],
+[m4_ifset(_AM_MANGLE_OPTION([$1]), [$2], [$3])])
+
+# Check to make sure that the build environment is sane.    -*- Autoconf -*-
+
+# Copyright (C) 1996, 1997, 2000, 2001, 2003, 2005, 2008
+# Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 5
+
+# AM_SANITY_CHECK
+# ---------------
+AC_DEFUN([AM_SANITY_CHECK],
+[AC_MSG_CHECKING([whether build environment is sane])
+# Just in case
+sleep 1
+echo timestamp > conftest.file
+# Reject unsafe characters in $srcdir or the absolute working directory
+# name.  Accept space and tab only in the latter.
+am_lf='
+'
+case `pwd` in
+  *[[\\\"\#\$\&\'\`$am_lf]]*)
+    AC_MSG_ERROR([unsafe absolute working directory name]);;
+esac
+case $srcdir in
+  *[[\\\"\#\$\&\'\`$am_lf\ \	]]*)
+    AC_MSG_ERROR([unsafe srcdir value: `$srcdir']);;
+esac
+
+# Do `set' in a subshell so we don't clobber the current shell's
+# arguments.  Must try -L first in case configure is actually a
+# symlink; some systems play weird games with the mod time of symlinks
+# (eg FreeBSD returns the mod time of the symlink's containing
+# directory).
+if (
+   set X `ls -Lt "$srcdir/configure" conftest.file 2> /dev/null`
+   if test "$[*]" = "X"; then
+      # -L didn't work.
+      set X `ls -t "$srcdir/configure" conftest.file`
+   fi
+   rm -f conftest.file
+   if test "$[*]" != "X $srcdir/configure conftest.file" \
+      && test "$[*]" != "X conftest.file $srcdir/configure"; then
+
+      # If neither matched, then we have a broken ls.  This can happen
+      # if, for instance, CONFIG_SHELL is bash and it inherits a
+      # broken ls alias from the environment.  This has actually
+      # happened.  Such a system could not be considered "sane".
+      AC_MSG_ERROR([ls -t appears to fail.  Make sure there is not a broken
+alias in your environment])
+   fi
+
+   test "$[2]" = conftest.file
+   )
+then
+   # Ok.
+   :
+else
+   AC_MSG_ERROR([newly created file is older than distributed files!
+Check your system clock])
+fi
+AC_MSG_RESULT(yes)])
+
+# Copyright (C) 2001, 2003, 2005  Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# AM_PROG_INSTALL_STRIP
+# ---------------------
+# One issue with vendor `install' (even GNU) is that you can't
+# specify the program used to strip binaries.  This is especially
+# annoying in cross-compiling environments, where the build's strip
+# is unlikely to handle the host's binaries.
+# Fortunately install-sh will honor a STRIPPROG variable, so we
+# always use install-sh in `make install-strip', and initialize
+# STRIPPROG with the value of the STRIP variable (set by the user).
+AC_DEFUN([AM_PROG_INSTALL_STRIP],
+[AC_REQUIRE([AM_PROG_INSTALL_SH])dnl
+# Installed binaries are usually stripped using `strip' when the user
+# run `make install-strip'.  However `strip' might not be the right
+# tool to use in cross-compilation environments, therefore Automake
+# will honor the `STRIP' environment variable to overrule this program.
+dnl Don't test for $cross_compiling = yes, because it might be `maybe'.
+if test "$cross_compiling" != no; then
+  AC_CHECK_TOOL([STRIP], [strip], :)
+fi
+INSTALL_STRIP_PROGRAM="\$(install_sh) -c -s"
+AC_SUBST([INSTALL_STRIP_PROGRAM])])
+
+# Copyright (C) 2006, 2008  Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 2
+
+# _AM_SUBST_NOTMAKE(VARIABLE)
+# ---------------------------
+# Prevent Automake from outputting VARIABLE = @VARIABLE@ in Makefile.in.
+# This macro is traced by Automake.
+AC_DEFUN([_AM_SUBST_NOTMAKE])
+
+# AM_SUBST_NOTMAKE(VARIABLE)
+# ---------------------------
+# Public sister of _AM_SUBST_NOTMAKE.
+AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])
+
+# Check how to create a tarball.                            -*- Autoconf -*-
+
+# Copyright (C) 2004, 2005  Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 2
+
+# _AM_PROG_TAR(FORMAT)
+# --------------------
+# Check how to create a tarball in format FORMAT.
+# FORMAT should be one of `v7', `ustar', or `pax'.
+#
+# Substitute a variable $(am__tar) that is a command
+# writing to stdout a FORMAT-tarball containing the directory
+# $tardir.
+#     tardir=directory && $(am__tar) > result.tar
+#
+# Substitute a variable $(am__untar) that extract such
+# a tarball read from stdin.
+#     $(am__untar) < result.tar
+AC_DEFUN([_AM_PROG_TAR],
+[# Always define AMTAR for backward compatibility.
+AM_MISSING_PROG([AMTAR], [tar])
+m4_if([$1], [v7],
+     [am__tar='${AMTAR} chof - "$$tardir"'; am__untar='${AMTAR} xf -'],
+     [m4_case([$1], [ustar],, [pax],,
+              [m4_fatal([Unknown tar format])])
+AC_MSG_CHECKING([how to create a $1 tar archive])
+# Loop over all known methods to create a tar archive until one works.
+_am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'
+_am_tools=${am_cv_prog_tar_$1-$_am_tools}
+# Do not fold the above two line into one, because Tru64 sh and
+# Solaris sh will not grok spaces in the rhs of `-'.
+for _am_tool in $_am_tools
+do
+  case $_am_tool in
+  gnutar)
+    for _am_tar in tar gnutar gtar;
+    do
+      AM_RUN_LOG([$_am_tar --version]) && break
+    done
+    am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'
+    am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'
+    am__untar="$_am_tar -xf -"
+    ;;
+  plaintar)
+    # Must skip GNU tar: if it does not support --format= it doesn't create
+    # ustar tarball either.
+    (tar --version) >/dev/null 2>&1 && continue
+    am__tar='tar chf - "$$tardir"'
+    am__tar_='tar chf - "$tardir"'
+    am__untar='tar xf -'
+    ;;
+  pax)
+    am__tar='pax -L -x $1 -w "$$tardir"'
+    am__tar_='pax -L -x $1 -w "$tardir"'
+    am__untar='pax -r'
+    ;;
+  cpio)
+    am__tar='find "$$tardir" -print | cpio -o -H $1 -L'
+    am__tar_='find "$tardir" -print | cpio -o -H $1 -L'
+    am__untar='cpio -i -H $1 -d'
+    ;;
+  none)
+    am__tar=false
+    am__tar_=false
+    am__untar=false
+    ;;
+  esac
+
+  # If the value was cached, stop now.  We just wanted to have am__tar
+  # and am__untar set.
+  test -n "${am_cv_prog_tar_$1}" && break
+
+  # tar/untar a dummy directory, and stop if the command works
+  rm -rf conftest.dir
+  mkdir conftest.dir
+  echo GrepMe > conftest.dir/file
+  AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])
+  rm -rf conftest.dir
+  if test -s conftest.tar; then
+    AM_RUN_LOG([$am__untar <conftest.tar])
+    grep GrepMe conftest.dir/file >/dev/null 2>&1 && break
+  fi
+done
+rm -rf conftest.dir
+
+AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])
+AC_MSG_RESULT([$am_cv_prog_tar_$1])])
+AC_SUBST([am__tar])
+AC_SUBST([am__untar])
+]) # _AM_PROG_TAR
+
+m4_include([../config/acx.m4])
+m4_include([../config/lead-dot.m4])
+m4_include([../config/libstdc++-raw-cxx.m4])
+m4_include([../config/multi.m4])
+m4_include([../config/override.m4])
+m4_include([../libtool.m4])
+m4_include([../ltoptions.m4])
+m4_include([../ltsugar.m4])
+m4_include([../ltversion.m4])
+m4_include([../lt~obsolete.m4])
diff --git a/libmpx/config.h.in b/libmpx/config.h.in
new file mode 100644
index 0000000..a318e02
--- /dev/null
+++ b/libmpx/config.h.in
@@ -0,0 +1,100 @@
+/* config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#undef HAVE_DLFCN_H
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#undef HAVE_INTTYPES_H
+
+/* Define to 1 if you have the <memory.h> header file. */
+#undef HAVE_MEMORY_H
+
+/* Define to 1 if you have the `secure_getenv' function. */
+#undef HAVE_SECURE_GETENV
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#undef HAVE_STDINT_H
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#undef HAVE_STDLIB_H
+
+/* Define to 1 if you have the <strings.h> header file. */
+#undef HAVE_STRINGS_H
+
+/* Define to 1 if you have the <string.h> header file. */
+#undef HAVE_STRING_H
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#undef HAVE_SYS_STAT_H
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#undef HAVE_SYS_TYPES_H
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#undef HAVE_UNISTD_H
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#undef LT_OBJDIR
+
+/* Define to 1 if your C compiler doesn't accept -c and -o together. */
+#undef NO_MINUS_C_MINUS_O
+
+/* Name of package */
+#undef PACKAGE
+
+/* Define to the address where bug reports for this package should be sent. */
+#undef PACKAGE_BUGREPORT
+
+/* Define to the full name of this package. */
+#undef PACKAGE_NAME
+
+/* Define to the full name and version of this package. */
+#undef PACKAGE_STRING
+
+/* Define to the one symbol short name of this package. */
+#undef PACKAGE_TARNAME
+
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
+/* Define to the version of this package. */
+#undef PACKAGE_VERSION
+
+/* Define to 1 if you have the ANSI C header files. */
+#undef STDC_HEADERS
+
+/* Enable extensions on AIX 3, Interix.  */
+#ifndef _ALL_SOURCE
+# undef _ALL_SOURCE
+#endif
+/* Enable GNU extensions on systems that have them.  */
+#ifndef _GNU_SOURCE
+# undef _GNU_SOURCE
+#endif
+/* Enable threading extensions on Solaris.  */
+#ifndef _POSIX_PTHREAD_SEMANTICS
+# undef _POSIX_PTHREAD_SEMANTICS
+#endif
+/* Enable extensions on HP NonStop.  */
+#ifndef _TANDEM_SOURCE
+# undef _TANDEM_SOURCE
+#endif
+/* Enable general extensions on Solaris.  */
+#ifndef __EXTENSIONS__
+# undef __EXTENSIONS__
+#endif
+
+
+/* Version number of package */
+#undef VERSION
+
+/* Define to 1 if on MINIX. */
+#undef _MINIX
+
+/* Define to 2 if the system does not provide POSIX.1 features except with
+   this defined. */
+#undef _POSIX_1_SOURCE
+
+/* Define to 1 if you need to in order for `stat' and other things to work. */
+#undef _POSIX_SOURCE
diff --git a/libmpx/configure.ac b/libmpx/configure.ac
new file mode 100644
index 0000000..dbfad02
--- /dev/null
+++ b/libmpx/configure.ac
@@ -0,0 +1,133 @@
+# -*- Autoconf -*-
+# Process this file with autoconf to produce a configure script.
+
+AC_PREREQ([2.64])
+AC_INIT(package-unused, version-unused, libmpx)
+
+# -------
+# Options
+# -------
+AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
+AC_ARG_ENABLE(version-specific-runtime-libs,
+[  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
+[case "$enableval" in
+ yes) version_specific_libs=yes ;;
+ no)  version_specific_libs=no ;;
+ *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
+ esac],
+[version_specific_libs=no])
+AC_MSG_RESULT($version_specific_libs)
+
+# Do not delete or change the following two lines.  For why, see
+# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
+AC_CANONICAL_SYSTEM
+target_alias=${target_alias-$host_alias}
+AC_SUBST(target_alias)
+GCC_LIBSTDCXX_RAW_CXX_FLAGS
+
+# See if supported.
+unset LIBMPX_SUPPORTED
+AC_MSG_CHECKING([for target support for Intel MPX runtime library])
+echo "int i[sizeof (void *) == 4 ? 1 : -1] = { __x86_64__ };" > conftest.c
+if AC_TRY_COMMAND([${CC} ${CFLAGS} -c -o conftest.o conftest.c 1>&AS_MESSAGE_LOG_FD])
+then
+    LIBMPX_SUPPORTED=no
+else
+    LIBMPX_SUPPORTED=yes
+fi
+rm -f conftest.o conftest.c
+AC_MSG_RESULT($LIBMPX_SUPPORTED)
+AM_CONDITIONAL(LIBMPX_SUPPORTED, [test "x$LIBMPX_SUPPORTED" = "xyes"])
+
+link_libmpx="-lpthread"
+AC_SUBST(link_libmpx)
+
+AM_INIT_AUTOMAKE(foreign no-dist no-dependencies)
+AM_ENABLE_MULTILIB(, ..)
+AM_MAINTAINER_MODE
+
+AC_GNU_SOURCE
+AC_CHECK_FUNCS([secure_getenv])
+
+# Calculate toolexeclibdir
+# Also toolexecdir, though it's only used in toolexeclibdir
+case ${version_specific_libs} in
+  yes)
+    # Need the gcc compiler version to know where to install libraries
+    # and header files if --enable-version-specific-runtime-libs option
+    # is selected.
+    toolexecdir='$(libdir)/gcc/$(target_alias)'
+    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
+    ;;
+  no)
+    if test -n "$with_cross_host" &&
+       test x"$with_cross_host" != x"no"; then
+      # Install a library built with a cross compiler in tooldir, not libdir.
+      toolexecdir='$(exec_prefix)/$(target_alias)'
+      toolexeclibdir='$(toolexecdir)/lib'
+    else
+      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
+      toolexeclibdir='$(libdir)'
+    fi
+    multi_os_directory=`$CC -print-multi-os-directory`
+    case $multi_os_directory in
+      .) ;; # Avoid trailing /.
+      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
+    esac
+    ;;
+esac
+AC_SUBST(toolexecdir)
+AC_SUBST(toolexeclibdir)
+
+# Check for programs.
+m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
+m4_define([_AC_ARG_VAR_PRECIOUS],[])
+AC_PROG_CC
+AC_PROG_CXX
+m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
+
+AM_PROG_CC_C_O
+
+AC_SUBST(CFLAGS)
+
+# Newer automakes demand CCAS and CCASFLAGS.
+: ${CCAS='$(CC)'}
+: ${CCASFLAGS='$(CFLAGS)'}
+AC_SUBST(CCAS)
+AC_SUBST(CCASFLAGS)
+
+AC_CHECK_TOOL(AS, as)
+AC_CHECK_TOOL(AR, ar)
+AC_CHECK_TOOL(RANLIB, ranlib, :)
+
+# Configure libtool
+AC_LIBTOOL_DLOPEN
+AM_PROG_LIBTOOL
+AC_SUBST(enable_shared)
+AC_SUBST(enable_static)
+
+XCFLAGS="-Wall -Wextra"
+AC_SUBST(XCFLAGS)
+
+if test "${multilib}" = "yes"; then
+  multilib_arg="--enable-multilib"
+else
+  multilib_arg=
+fi
+
+AC_CONFIG_FILES([Makefile libmpx.spec])
+AC_CONFIG_HEADERS(config.h)
+AC_CONFIG_FILES(AC_FOREACH([DIR], [mpxrt], [DIR/Makefile]),
+  [cat > vpsed$$ << \_EOF
+s!`test -f '$<' || echo '$(srcdir)/'`!!
+_EOF
+   sed -f vpsed$$ $ac_file > tmp$$
+   mv tmp$$ $ac_file
+   rm vpsed$$
+   echo 'MULTISUBDIR =' >> $ac_file
+   ml_norecursion=yes
+   . ${multi_basedir}/config-ml.in
+   AS_UNSET([ml_norecursion])
+])
+
+AC_OUTPUT
diff --git a/libmpx/configure.tgt b/libmpx/configure.tgt
new file mode 100644
index 0000000..5060b7e
--- /dev/null
+++ b/libmpx/configure.tgt
@@ -0,0 +1,29 @@
+# -*- shell-script -*-
+#   Copyright (C) 2014 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not see <http://www.gnu.org/licenses/>.
+
+# This is the target specific configuration file.  This is invoked by the
+# autoconf generated configure script.  Putting it in a separate shell file
+# lets us skip running autoconf when modifying target specific information.
+
+# Filter out unsupported systems.
+LIBMPX_SUPPORTED=no
+case "${target}" in
+  x86_64-*-linux* | i?86-*-linux*)
+	LIBMPX_SUPPORTED=yes
+	;;
+  *)
+	;;
+esac
diff --git a/libmpx/libmpx.spec.in b/libmpx/libmpx.spec.in
new file mode 100644
index 0000000..a265e28
--- /dev/null
+++ b/libmpx/libmpx.spec.in
@@ -0,0 +1,3 @@
+# This spec file is read by gcc when linking.  It is used to specify the
+# standard libraries we need in order to link with libcilkrts.
+*link_libmpx: @link_libmpx@
diff --git a/libmpx/libtool-version b/libmpx/libtool-version
new file mode 100644
index 0000000..d1f57a0
--- /dev/null
+++ b/libmpx/libtool-version
@@ -0,0 +1,6 @@
+# This file is used to maintain libtool version info for libmpx.  See
+# the libtool manual to understand the meaning of the fields.  This is
+# a separate file so that version updates don't involve re-running
+# automake.
+# CURRENT:REVISION:AGE
+0:0:0
diff --git a/libmpx/mpxrt/Makefile.am b/libmpx/mpxrt/Makefile.am
new file mode 100644
index 0000000..5f5c21e
--- /dev/null
+++ b/libmpx/mpxrt/Makefile.am
@@ -0,0 +1,59 @@
+ACLOCAL_AMFLAGS = -I $(top_srcdir) -I $(top_srcdir)/config
+
+if LIBMPX_SUPPORTED
+# May be used by toolexeclibdir.
+gcc_version := $(shell cat $(top_srcdir)/../gcc/BASE-VER)
+
+AM_CPPFLAGS = -I$(top_srcdir)/..
+AM_CFLAGS = $(XCFLAGS)
+
+toolexeclib_LTLIBRARIES = libmpx.la
+
+libmpx_la_SOURCES = mpxrt.c mpxrt-utils.c
+
+libmpx_la_DEPENDENCIES = libmpx.map
+libmpx_la_LDFLAGS = -Wl,--version-script=$(srcdir)/libmpx.map $(link_libmpx)
+
+mpxrt.lo: mpxrt-utils.h
+mpxrt-utils.lo: mpxrt-utils.h
+endif
+
+# Work around what appears to be a GNU make bug handling MAKEFLAGS
+# values defined in terms of make variables, as is the case for CC and
+# friends when we are called from the top level Makefile.
+AM_MAKEFLAGS = \
+	"AR_FLAGS=$(AR_FLAGS)" \
+	"CC_FOR_BUILD=$(CC_FOR_BUILD)" \
+	"CFLAGS=$(CFLAGS)" \
+	"CXXFLAGS=$(CXXFLAGS)" \
+	"CFLAGS_FOR_BUILD=$(CFLAGS_FOR_BUILD)" \
+	"CFLAGS_FOR_TARGET=$(CFLAGS_FOR_TARGET)" \
+	"INSTALL=$(INSTALL)" \
+	"INSTALL_DATA=$(INSTALL_DATA)" \
+	"INSTALL_PROGRAM=$(INSTALL_PROGRAM)" \
+	"INSTALL_SCRIPT=$(INSTALL_SCRIPT)" \
+	"JC1FLAGS=$(JC1FLAGS)" \
+	"LDFLAGS=$(LDFLAGS)" \
+	"LIBCFLAGS=$(LIBCFLAGS)" \
+	"LIBCFLAGS_FOR_TARGET=$(LIBCFLAGS_FOR_TARGET)" \
+	"MAKE=$(MAKE)" \
+	"MAKEINFO=$(MAKEINFO) $(MAKEINFOFLAGS)" \
+	"PICFLAG=$(PICFLAG)" \
+	"PICFLAG_FOR_TARGET=$(PICFLAG_FOR_TARGET)" \
+	"SHELL=$(SHELL)" \
+	"RUNTESTFLAGS=$(RUNTESTFLAGS)" \
+	"exec_prefix=$(exec_prefix)" \
+	"infodir=$(infodir)" \
+	"libdir=$(libdir)" \
+	"prefix=$(prefix)" \
+	"includedir=$(includedir)" \
+	"AR=$(AR)" \
+	"AS=$(AS)" \
+	"LD=$(LD)" \
+	"LIBCFLAGS=$(LIBCFLAGS)" \
+	"NM=$(NM)" \
+	"PICFLAG=$(PICFLAG)" \
+	"RANLIB=$(RANLIB)" \
+	"DESTDIR=$(DESTDIR)"
+
+MAKEOVERRIDES=
diff --git a/libmpx/mpxrt/libmpx.map b/libmpx/mpxrt/libmpx.map
new file mode 100644
index 0000000..90093b7
--- /dev/null
+++ b/libmpx/mpxrt/libmpx.map
@@ -0,0 +1,5 @@
+LIBMPX_1.0
+{
+  local:
+	*;
+};
diff --git a/libmpx/mpxrt/libtool-version b/libmpx/mpxrt/libtool-version
new file mode 100644
index 0000000..5aa6ed7
--- /dev/null
+++ b/libmpx/mpxrt/libtool-version
@@ -0,0 +1,6 @@
+# This file is used to maintain libtool version info for libmpx.  See
+# the libtool manual to understand the meaning of the fields.  This is
+# a separate file so that version updates don't involve re-running
+# automake.
+# CURRENT:REVISION:AGE
+1:0:0
diff --git a/libmpx/mpxrt/mpxrt-utils.c b/libmpx/mpxrt/mpxrt-utils.c
new file mode 100644
index 0000000..db672c4
--- /dev/null
+++ b/libmpx/mpxrt/mpxrt-utils.c
@@ -0,0 +1,533 @@
+/* mpxrt-utils.c                  -*-C++-*-
+ *
+ *************************************************************************
+ *
+ *  @copyright
+ *  Copyright (C) 2014, Intel Corporation
+ *  All rights reserved.
+ *
+ *  @copyright
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  @copyright
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ *  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ *  WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ *
+ **************************************************************************/
+
+#define __STDC_FORMAT_MACROS
+#include "config.h"
+#include <inttypes.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <pthread.h>
+#include "mpxrt-utils.h"
+
+#ifndef HAVE_SECURE_GETENV
+#define secure_getenv __secure_getenv
+#endif
+
+#define MPX_RT_OUT "CHKP_RT_OUT_FILE"
+#define MPX_RT_ERR "CHKP_RT_ERR_FILE"
+#define MPX_RT_VERBOSE "CHKP_RT_VERBOSE"
+#define MPX_RT_VERBOSE_DEFAULT VERB_BR
+#define MPX_RT_ENABLE "CHKP_RT_ENABLE"
+#define MPX_RT_ENABLE_DEFAULT 1
+#define MPX_RT_MODE "CHKP_RT_MODE"
+#define MPX_RT_MODE_DEFAULT MPX_RT_COUNT
+#define MPX_RT_MODE_DEFAULT_STR "count"
+#define MPX_RT_HELP "CHKP_RT_HELP"
+#define MPX_RT_ADDPID "CHKP_RT_ADDPID"
+#define MPX_RT_BNDPRESERVE "CHKP_RT_BNDPRESERVE"
+#define MPX_RT_BNDPRESERVE_DEFAULT 0
+#define MPX_RT_PRINT_SUMMARY "CHKP_RT_PRINT_SUMMARY"
+
+#define MAX_FILE_NAME PATH_MAX
+
+typedef struct env_var_s {
+  char *env_name;
+  char *env_val;
+  struct env_var_s *next;
+} env_var_t;
+
+typedef struct {
+  env_var_t *first;
+  env_var_t *last;
+} env_var_list_t;
+
+/* Following vars are initialized at process startup only
+   and thus are considered to be thread safe.  */
+static int summary;
+static int add_pid;
+static mpx_rt_mode_t mode;
+static env_var_list_t env_var_list;
+static verbose_type verbose_val;
+static FILE *out;
+static FILE *err;
+static char out_name[MAX_FILE_NAME];
+static char err_name[MAX_FILE_NAME];
+
+/* Following vars are read at process finalization only.
+   All write accesses use the same value and thus are
+   considered to be thread safe.  */
+static int out_file_dirty;
+static int err_file_dirty;
+static int files_overwritten;
+
+/* Mutex used to sync output.  */
+static pthread_mutex_t lock;
+
+static void *
+malloc_check (size_t size)
+{
+  void *res = malloc (size);
+  if (!res)
+    __mpxrt_print (VERB_ERROR, "Couldn't allocate %zu bytes.", size);
+  else
+    memset (res, 0, size);
+  return res;
+}
+
+static void
+env_var_list_add (const char* env, const char* val)
+{
+  env_var_t* n;
+
+  if (val == 0)
+    return;
+
+  n = (env_var_t *)malloc_check (sizeof (env_var_t));
+  if (!n)
+    return;
+
+  if (env_var_list.first == 0)
+    env_var_list.first = n;
+
+  if (env_var_list.last)
+    env_var_list.last->next = n;
+
+  env_var_list.last = n;
+
+  n->env_name = (char *)malloc_check (strlen (env) + 1);
+  n->env_val = (char *)malloc_check (strlen (val) + 1);
+
+  if (!n->env_name || !n->env_val)
+    return;
+
+  strcpy (n->env_name, env);
+  strcpy (n->env_val, val);
+}
+
+static void
+set_file_stream (FILE** file, char* file_name,
+		 const char* env, FILE* deflt)
+{
+  int pid;
+  if (env != 0)
+    {
+      if (add_pid)
+	{
+	  pid = getpid ();
+	  snprintf (file_name, MAX_FILE_NAME, "%s.%d", env, pid);
+	}
+      else
+	snprintf (file_name, MAX_FILE_NAME, "%s", env);
+
+      *file = fopen (file_name, "we");
+      if (*file != 0)
+	return;
+    }
+  *file = deflt;
+}
+
+/*
+ * this function will be called after fork in the child
+ * open new files with pid of the process
+ */
+static void
+open_child_files ()
+{
+  char *out_env;
+  char *err_env;
+
+  out_env = secure_getenv (MPX_RT_OUT);
+  err_env = secure_getenv (MPX_RT_ERR);
+
+  if (add_pid == 0 && (out_env != 0 || err_env != 0))
+    {
+      __mpxrt_print (VERB_ERROR, "MPX RUNTIME WARNING: out/err files are "
+		     "overwritten in new processes since %s was not set.\n",
+		     MPX_RT_ADDPID);
+      files_overwritten = 1;
+    }
+
+  set_file_stream (&out, out_name, out_env, stdout);
+  if (out_env == 0 || err_env == 0 || (strcmp (out_env, err_env) != 0))
+    set_file_stream (&err, err_name, err_env, stderr);
+  else
+    /* in case we get the same file name for err and out */
+    err = out;
+}
+
+/*
+ * this function is called after fork in the parent
+ */
+static void
+at_fork_check (void)
+{
+  char *out_env;
+  char *err_env;
+
+  out_env = secure_getenv (MPX_RT_OUT);
+  err_env = secure_getenv (MPX_RT_ERR);
+
+  if (add_pid == 0 && (out_env != 0 || err_env != 0))
+    files_overwritten = 1;
+}
+
+static mpx_rt_mode_t
+set_mpx_rt_mode (const char *env)
+{
+  if (env == 0)
+    return MPX_RT_MODE_DEFAULT;
+  else if (strcmp (env, "stop") == 0)
+    return MPX_RT_STOP;
+  else if (strcmp (env,"count") == 0)
+    return MPX_RT_COUNT;
+  {
+    __mpxrt_print (VERB_ERROR, "Illegal value '%s' for %s. Legal values are"
+		   "[stop | count]\nUsing default value %s\n",
+		   env, MPX_RT_MODE, MPX_RT_MODE_DEFAULT_STR);
+    return MPX_RT_MODE_DEFAULT;
+  }
+}
+
+static void
+print_help (void)
+{
+  fprintf (out, "MPX Runtime environment variables help.\n");
+
+  fprintf (out, "%s \t set output file for info & debug [default: stdout]\n",
+	   MPX_RT_OUT);
+  fprintf (out, "%s \t set output file for error [default: stderr]\n",
+	   MPX_RT_ERR);
+  fprintf (out, "%s \t set verbosity type [default: %d]\n"
+	   "\t\t\t 0 - print only internal run time errors\n"
+	   "\t\t\t 1 - just print summary\n"
+	   "\t\t\t 2 - print summary and bound violation information\n "
+	   "\t\t\t 3 - print debug information\n",
+	   MPX_RT_VERBOSE, MPX_RT_VERBOSE_DEFAULT);
+  fprintf (out, "%s \t\t set MPX runtime behavior on #BR exception."
+	   " [stop | count]\n"
+	   "\t\t\t [default: %s]\n", MPX_RT_MODE, MPX_RT_MODE_DEFAULT_STR);
+  fprintf (out, "%s \t\t generate out,err file for each process.\n"
+	   "\t\t\t generated file will be MPX_RT_{OUT,ERR}_FILE.pid\n"
+	   "\t\t\t [default: no]\n", MPX_RT_ADDPID);
+  fprintf (out, "%s \t set value for BNDPRESERVE bit.\n"
+	   "\t\t\t BNDPRESERVE = 0 flush bounds on unprefixed call/ret/jmp\n"
+	   "\t\t\t BNDPRESERVE = 1 do NOT flush bounds\n"
+	   "\t\t\t [default: %d]\n", MPX_RT_BNDPRESERVE,
+	   MPX_RT_BNDPRESERVE_DEFAULT);
+  fprintf (out, "%s \t set value for ENABLE bit.\n"
+	   "\t\t\t ENABLE = 0 enable MPX feature\n"
+	   "\t\t\t ENABLE = 1 disable MPX feature\n"
+	   "\t\t\t [default: %d]\n", MPX_RT_ENABLE,
+	   MPX_RT_ENABLE_DEFAULT);
+  fprintf (out, "%s \t print summary at the end of the run\n"
+	   "\t\t\t [default: no]\n", MPX_RT_PRINT_SUMMARY);
+
+  fprintf (out, "%s \t\t print this help and exit.\n"
+	   "\t\t\t [default: no]\n", MPX_RT_HELP);
+
+  exit (0);
+}
+
+static void
+validate_bndpreserve (const char *env, int *bndpreserve)
+{
+  if (env == 0)
+    bndpreserve = MPX_RT_BNDPRESERVE_DEFAULT;
+  else if (strcmp (env, "0") == 0)
+    *bndpreserve = 0;
+  else if (strcmp (env, "1") == 0)
+    *bndpreserve = 1;
+  else
+    {
+      __mpxrt_print (VERB_ERROR, "Illegal value '%s' for %s. Legal values "
+		     "are [0 | 1]\nUsing default value %d\n",
+		     env, MPX_RT_BNDPRESERVE, MPX_RT_BNDPRESERVE_DEFAULT);
+      *bndpreserve = MPX_RT_BNDPRESERVE_DEFAULT;
+    }
+}
+
+static void
+validate_enable (const char *env, int *enable)
+{
+  if (env == 0)
+    *enable = MPX_RT_ENABLE_DEFAULT;
+  else if (strcmp (env, "0") == 0)
+    *enable = 0;
+  else if (strcmp (env, "1") == 0)
+    *enable = 1;
+  else
+    {
+      __mpxrt_print (VERB_ERROR, "Illegal value '%s' for %s. Legal values "
+		     "are [0 | 1]\nUsing default value %d\n",
+		     env, MPX_RT_ENABLE, MPX_RT_ENABLE_DEFAULT);
+      *enable = MPX_RT_ENABLE_DEFAULT;
+    }
+}
+
+static verbose_type
+init_verbose_val (const char *env)
+{
+  if (env == 0)
+    return MPX_RT_VERBOSE_DEFAULT;
+  else if (strcmp(env, "0") == 0)
+    return VERB_ERROR;
+  else if (strcmp(env, "1") == 0)
+    return VERB_INFO;
+  else if (strcmp(env, "2") == 0)
+    return VERB_BR;
+  else if (strcmp(env, "3") == 0)
+    return VERB_DEBUG;
+
+  __mpxrt_print (VERB_ERROR, "Illegal value '%s' for %s. Legal values "
+		 "are [0..3]\nUsing default value %d\n",
+		 env, MPX_RT_VERBOSE, (int)MPX_RT_VERBOSE_DEFAULT);
+
+  return MPX_RT_VERBOSE_DEFAULT;
+}
+
+static void
+env_var_print_summary (void)
+{
+  env_var_t* node;
+
+  __mpxrt_print (VERB_DEBUG, "Used environment variables:\n");
+
+  node = env_var_list.first;
+  while (node != 0)
+    {
+      __mpxrt_print (VERB_DEBUG, "  %s = %s\n", node->env_name, node->env_val);
+      node = node->next;
+    }
+}
+
+/* Return 1 if passes env var value should enable feature.  */
+
+static int
+check_yes (const char *val)
+{
+  return val && (!strcmp (val, "yes") || !strcmp (val, "1"));
+}
+
+void
+__mpxrt_init_env_vars (int* bndpreserve, int *enable)
+{
+  char *out_env;
+  char *err_env;
+  char *env;
+
+  pthread_mutex_init (&lock, NULL);
+
+  out_env = secure_getenv (MPX_RT_OUT);
+  env_var_list_add (MPX_RT_OUT, out_env);
+
+  err_env = secure_getenv (MPX_RT_ERR);
+  env_var_list_add (MPX_RT_ERR, err_env);
+
+  env = secure_getenv (MPX_RT_ADDPID);
+  env_var_list_add (MPX_RT_ADDPID, env);
+  add_pid = check_yes (env);
+
+  set_file_stream (&out, out_name, out_env, stdout);
+  if (out_env == 0 || err_env == 0 || (strcmp (out_env, err_env) != 0))
+    set_file_stream (&err, err_name, err_env, stderr);
+  else
+    /* in case we get the same file name for err and out */
+    err = out;
+
+  env = secure_getenv (MPX_RT_VERBOSE);
+  env_var_list_add (MPX_RT_VERBOSE, env);
+  verbose_val = init_verbose_val (env);
+
+  env = secure_getenv (MPX_RT_MODE);
+  env_var_list_add (MPX_RT_MODE, env);
+  mode = set_mpx_rt_mode (env);
+
+  env = secure_getenv (MPX_RT_BNDPRESERVE);
+  env_var_list_add (MPX_RT_BNDPRESERVE, env);
+  validate_bndpreserve (env, bndpreserve);
+
+  env = secure_getenv (MPX_RT_ENABLE);
+  env_var_list_add (MPX_RT_ENABLE, env);
+  validate_enable (env, enable);
+
+  env = secure_getenv (MPX_RT_PRINT_SUMMARY);
+  env_var_list_add (MPX_RT_PRINT_SUMMARY, env);
+  summary = check_yes (env);
+
+  env = secure_getenv (MPX_RT_HELP);
+  if (check_yes (env))
+    print_help ();
+
+  /*
+   * at fork - create new files for output and err according
+   * to the env vars.
+   */
+  pthread_atfork (NULL, at_fork_check, open_child_files);
+
+  env_var_print_summary ();
+}
+
+void
+__mpxrt_utils_free (void)
+{
+  if (files_overwritten)
+    __mpxrt_print (VERB_INFO, "\nMPX RUNTIME WARNING: out/err files are"
+		   " overwritten in new processes since %s was not set.\n",
+		   MPX_RT_ADDPID);
+
+  if (out != stdout)
+    {
+      fclose (out);
+      if (out_file_dirty != 1)
+	remove (out_name);
+    }
+
+  if (err != stderr)
+    {
+      fclose (err);
+      if (err_file_dirty != 1)
+	remove (err_name);
+    }
+
+  pthread_mutex_destroy (&lock);
+}
+
+void
+__mpxrt_write_uint (verbose_type vt, uint64_t val, unsigned base)
+{
+  static const char digits[] = {
+    '0', '1', '2', '3', '4', '5', '6', '7',
+    '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
+  char str[65];
+  int len = 0;
+
+  if (vt > verbose_val || base <= 1 || base > sizeof (digits))
+    return;
+
+  if (val < base)
+    str[len++] = digits[val];
+  else
+    while (val)
+      {
+	str[len++] = digits[val % base];
+	val = val / base;
+      }
+  str[len++] = 0;
+
+  __mpxrt_write (vt, str);
+}
+
+void
+__mpxrt_write (verbose_type vt, const char* str)
+{
+  va_list argp;
+  FILE *print_to;
+
+  if (vt > verbose_val)
+    return;
+
+  if (vt == VERB_ERROR)
+    {
+      print_to = err;
+      err_file_dirty = 1;
+    }
+  else
+    {
+      print_to = out;
+      out_file_dirty = 1;
+    }
+  pthread_mutex_lock (&lock);
+  write (fileno (print_to), str, strlen (str));
+  pthread_mutex_unlock (&lock);
+  va_end (argp);
+}
+
+void
+__mpxrt_print (verbose_type vt, const char* frmt, ...)
+{
+  va_list argp;
+  FILE *print_to;
+
+  if (vt > verbose_val)
+    return;
+
+  va_start (argp, frmt);
+  if (vt == VERB_ERROR)
+    {
+      print_to = err;
+      err_file_dirty = 1;
+    }
+  else
+    {
+      print_to = out;
+      out_file_dirty = 1;
+    }
+  pthread_mutex_lock (&lock);
+  vfprintf (print_to, frmt, argp);
+  fflush (print_to);
+  pthread_mutex_unlock (&lock);
+  va_end (argp);
+}
+
+mpx_rt_mode_t
+__mpxrt_mode (void)
+{
+  return mode;
+}
+
+void
+__mpxrt_print_summary (uint64_t num_brs, uint64_t l1_size)
+{
+
+  if (summary == 0)
+    return;
+
+  out_file_dirty = 1;
+
+  pthread_mutex_lock (&lock);
+  fprintf (out, "MPX runtime summary:\n");
+  fprintf (out, "  Number of bounds violations: %" PRIu64 ".\n", num_brs);
+  fprintf (out, "  Size of allocated L1: %" PRIu64 "B\n", l1_size);
+  fflush (out);
+  pthread_mutex_unlock (&lock);
+}
diff --git a/libmpx/mpxrt/mpxrt-utils.h b/libmpx/mpxrt/mpxrt-utils.h
new file mode 100644
index 0000000..a8380a5
--- /dev/null
+++ b/libmpx/mpxrt/mpxrt-utils.h
@@ -0,0 +1,65 @@
+/* mpxrt-utils.h                  -*-C++-*-
+ *
+ *************************************************************************
+ *
+ *  @copyright
+ *  Copyright (C) 2014, Intel Corporation
+ *  All rights reserved.
+ *
+ *  @copyright
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  @copyright
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ *  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ *  WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ *
+ **************************************************************************/
+
+#ifndef MPXRT_UTILS_H
+#define MPXRT_UTILS_H
+
+#include <stdint.h>
+
+typedef enum {
+  VERB_ERROR,
+  VERB_INFO,
+  VERB_BR,
+  VERB_DEBUG
+} verbose_type;
+
+typedef enum {
+  MPX_RT_COUNT,
+  MPX_RT_STOP
+} mpx_rt_mode_t;
+
+void __mpxrt_init_env_vars (int* bndpreserve, int *enable);
+void __mpxrt_write_uint (verbose_type vt, uint64_t val, unsigned base);
+void __mpxrt_write (verbose_type vt, const char* str);
+void __mpxrt_print (verbose_type vt, const char* frmt, ...);
+mpx_rt_mode_t __mpxrt_mode (void);
+void __mpxrt_utils_free (void);
+void __mpxrt_print_summary (uint64_t num_brs, uint64_t l1_size);
+
+#endif /* MPXRT_UTILS_H */
diff --git a/libmpx/mpxrt/mpxrt.c b/libmpx/mpxrt/mpxrt.c
new file mode 100644
index 0000000..55bfcf4
--- /dev/null
+++ b/libmpx/mpxrt/mpxrt.c
@@ -0,0 +1,505 @@
+/* mpxrt.c                  -*-C++-*-
+ *
+ *************************************************************************
+ *
+ *  @copyright
+ *  Copyright (C) 2014, Intel Corporation
+ *  All rights reserved.
+ *
+ *  @copyright
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in
+ *      the documentation and/or other materials provided with the
+ *      distribution.
+ *    * Neither the name of Intel Corporation nor the names of its
+ *      contributors may be used to endorse or promote products derived
+ *      from this software without specific prior written permission.
+ *
+ *  @copyright
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *  HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ *  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+ *  WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *  POSSIBILITY OF SUCH DAMAGE.
+ *
+ **************************************************************************/
+
+#define __STDC_FORMAT_MACROS
+#include "config.h"
+#include <inttypes.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <signal.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <cpuid.h>
+#include "mpxrt-utils.h"
+
+#ifdef __i386__
+
+/* i386 directory size is 4MB */
+#define NUM_L1_BITS    20
+
+#define REG_IP_IDX      REG_EIP
+#define REX_PREFIX
+
+#define XSAVE_OFFSET_IN_FPMEM    sizeof (struct _libc_fpstate)
+
+#else /* __i386__ */
+
+/* x86_64 directory size is 2GB */
+#define NUM_L1_BITS   28
+
+#define REG_IP_IDX    REG_RIP
+#define REX_PREFIX    "0x48, "
+
+#define XSAVE_OFFSET_IN_FPMEM    0
+
+#endif /* !__i386__ */
+
+#define MPX_ENABLE_BIT_NO 0
+#define BNDPRESERVE_BIT_NO 1
+
+const size_t MPX_L1_SIZE = (1UL << NUM_L1_BITS) * sizeof (void *);
+
+struct xsave_hdr_struct
+{
+  uint64_t xstate_bv;
+  uint64_t reserved1[2];
+  uint64_t reserved2[5];
+} __attribute__ ((packed));
+
+struct bndregs_struct
+{
+  uint64_t bndregs[8];
+} __attribute__ ((packed));
+
+struct bndcsr_struct {
+	uint64_t cfg_reg_u;
+	uint64_t status_reg;
+} __attribute__((packed));
+
+struct xsave_struct
+{
+  uint8_t fpu_sse[512];
+  struct xsave_hdr_struct xsave_hdr;
+  uint8_t ymm[256];
+  uint8_t lwp[128];
+  struct bndregs_struct bndregs;
+  struct bndcsr_struct bndcsr;
+} __attribute__ ((packed));
+
+/* Following vars are initialized at process startup only
+   and thus are considered to be thread safe.  */
+static void *l1base = NULL;
+static int bndpreserve;
+static int enable;
+
+/* Var holding number of occured BRs.  It is modified from
+   signal handler only and thus it should be thread safe.  */
+static uint64_t num_bnd_chk = 0;
+
+static inline void
+xrstor_state (struct xsave_struct *fx, uint64_t mask)
+{
+  uint32_t lmask = mask;
+  uint32_t hmask = mask >> 32;
+
+  asm volatile (".byte " REX_PREFIX "0x0f,0xae,0x2f\n\t"
+		: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
+		:   "memory");
+}
+
+static inline void
+xsave_state (struct xsave_struct *fx, uint64_t mask)
+{
+  uint32_t lmask = mask;
+  uint32_t hmask = mask >> 32;
+
+  asm volatile (".byte " REX_PREFIX "0x0f,0xae,0x27\n\t"
+		: : "D" (fx), "m" (*fx), "a" (lmask), "d" (hmask)
+		:   "memory");
+}
+
+static inline uint64_t
+xgetbv (uint32_t index)
+{
+  uint32_t eax, edx;
+
+  asm volatile (".byte 0x0f,0x01,0xd0" /* xgetbv */
+		: "=a" (eax), "=d" (edx)
+		: "c" (index));
+  return eax + ((uint64_t)edx << 32);
+}
+
+static uint64_t
+read_mpx_status_sig (ucontext_t *uctxt)
+{
+  uint8_t __attribute__ ((__aligned__ (64))) buffer[4096];
+  struct xsave_struct *xsave_buf = (struct xsave_struct *)buffer;
+
+  memset (buffer, 0, sizeof (buffer));
+  memcpy (buffer,
+	  (uint8_t *)uctxt->uc_mcontext.fpregs + XSAVE_OFFSET_IN_FPMEM,
+	  sizeof (struct xsave_struct));
+  return xsave_buf->bndcsr.status_reg;
+}
+
+static uint8_t *
+get_next_inst_ip (uint8_t *addr)
+{
+  uint8_t *ip = addr;
+  uint8_t  sib;
+
+  /* determine the prefix. */
+  switch (*ip)
+    {
+    case 0xf2:
+    case 0xf3:
+    case 0x66:
+      ip++;
+      break;
+    }
+
+  /* look for rex prefix */
+  if ((*ip & 0x40) == 0x40)
+    ip++;
+
+  /* Make sure we have a MPX instruction. */
+  if (*ip++ != 0x0f)
+    return addr;
+
+  /* Skip the op code byte. */
+  ip++;
+
+  /* Get the moderm byte. */
+  uint8_t modrm = *ip++;
+
+  /* Break it down into parts. */
+  uint8_t rm = modrm & 7;
+  uint8_t mod = (modrm >> 6);
+
+  /* Init the parts of the address mode. */
+  uint8_t base = 8;
+
+  /* Is it a mem mode? */
+  if (mod != 3)
+    {
+      /* look for scaled indexed addressing */
+      if (rm == 4)
+	{
+	  /* SIB addressing */
+	  sib = *ip++;
+	  base = sib & 7;
+	  switch (mod)
+	    {
+	    case 0:
+	      if (base == 5)
+		ip += 4;
+	      break;
+
+	    case 1:
+	      ip++;
+	      break;
+
+	    case 2:
+	      ip += 4;
+	      break;
+	    }
+	}
+      else
+	{
+	  /* MODRM addressing */
+	  switch (mod)
+	    {
+	    case 0:
+	      if (rm == 5)
+		/* DISP32 addressing, no base */
+		ip += 4;
+	      break;
+
+	    case 1:
+	      ip++;
+	      break;
+
+	    case 2:
+	      ip += 4;
+	      break;
+	    }
+	}
+    }
+  return ip;
+}
+
+static void
+handler (int sig __attribute__ ((unused)),
+	 siginfo_t *info __attribute__ ((unused)),
+	 void *vucontext,
+	 struct xsave_struct *buf  __attribute__ ((unused)))
+{
+  ucontext_t* uctxt;
+  greg_t trapno;
+  greg_t ip;
+
+  uctxt = vucontext;
+  trapno = uctxt->uc_mcontext.gregs[REG_TRAPNO];
+  ip = uctxt->uc_mcontext.gregs[REG_IP_IDX];
+
+  if (trapno == 5)
+    {
+      uint64_t status = read_mpx_status_sig (uctxt);
+      uint64_t br_reason =  status & 0x3;
+
+      __mpxrt_write (VERB_BR, "Saw a #BR! status ");
+      __mpxrt_write_uint (VERB_BR, status, 10);
+      __mpxrt_write (VERB_BR, " at 0x");
+      __mpxrt_write_uint (VERB_BR, ip, 16);
+      __mpxrt_write (VERB_BR, "\n");
+
+      switch (br_reason)
+	{
+	case 1: /* traditional BR */
+	  num_bnd_chk++;
+	  uctxt->uc_mcontext.gregs[REG_IP_IDX] =
+	    (greg_t)get_next_inst_ip ((uint8_t *)ip);
+	  if (__mpxrt_mode () == MPX_RT_STOP)
+	    exit (255);
+	  return;
+
+	default:
+	  __mpxrt_write (VERB_BR, "Unexpected status with bound exception: ");
+	  __mpxrt_write_uint (VERB_BR, status, 10);
+	  __mpxrt_write (VERB_BR, "\n");
+	  break;
+	}
+    }
+  else if (trapno == 14)
+    {
+      __mpxrt_write (VERB_ERROR, "In signal handler, trapno = ");
+      __mpxrt_write_uint (VERB_ERROR, trapno, 10);
+      __mpxrt_write (VERB_ERROR, ", ip = 0x");
+      __mpxrt_write_uint (VERB_ERROR, ip, 16);
+      __mpxrt_write (VERB_BR, "\n");
+      exit (255);
+    }
+  else
+    {
+      __mpxrt_write (VERB_ERROR, "Unexpected trap ");
+      __mpxrt_write_uint (VERB_ERROR, trapno, 10);
+      __mpxrt_write (VERB_ERROR, "! at 0x");
+      __mpxrt_write_uint (VERB_ERROR, ip, 16);
+      __mpxrt_write (VERB_BR, "\n");
+      exit (255);
+    }
+}
+
+/*
+ * using wrapper to the real handler in order to save the bnd regs
+ * using xsave before any unprefixed call. an unprefixed call to
+ * __i686.get_pc_thunk.bx is added by the linker in 32bit at the
+ * beginning of handler function since there are references to
+ * global variables.
+ */
+static void
+handler_wrap (int signum, siginfo_t* si, void* vucontext)
+{
+  /*
+   * Since the OS currently not handling chkptr regs.
+   * We need to store them for later use. They might be
+   * init due to unprefixed call,Jcc,ret. avoiding calling
+   * function since the function will be unprefixed as well.
+   */
+  uint8_t __attribute__ ((__aligned__ (64))) buffer[4096];
+  struct xsave_struct *xsave_buf = (struct xsave_struct *)buffer;
+  uint64_t mask = 0x18;
+  uint32_t lmask = mask;
+  uint32_t hmask = mask >> 32;
+
+  asm volatile (".byte " REX_PREFIX "0x0f,0xae,0x27\n\t"
+		: : "D" (xsave_buf), "m" (*xsave_buf),
+		  "a" (lmask), "d" (hmask)
+		:   "memory");
+
+  handler (signum, si, vucontext, xsave_buf);
+}
+
+static bool
+check_mpx_support (void)
+{
+  unsigned int eax, ebx, ecx, edx;
+  unsigned int max_level = __get_cpuid_max (0, NULL);
+
+  if (max_level < 13)
+    {
+      __mpxrt_print (VERB_DEBUG, "No required CPUID level support.\n");
+      return false;
+    }
+
+  __cpuid_count (0, 0, eax, ebx, ecx, edx);
+  if (!(ecx & bit_XSAVE))
+    {
+      __mpxrt_print (VERB_DEBUG, "No XSAVE support.\n");
+      return false;
+    }
+
+  if (!(ecx & bit_OSXSAVE))
+    {
+      __mpxrt_print (VERB_DEBUG, "No OSXSAVE support.\n");
+      return false;
+    }
+
+  __cpuid_count (7, 0, eax, ebx, ecx, edx);
+  if (!(ebx & bit_MPX))
+    {
+      __mpxrt_print (VERB_DEBUG, "No MPX support.\n");
+      return false;
+    }
+
+  __cpuid_count (13, 0, eax, ebx, ecx, edx);
+  if (!(eax & bit_BNDREGS))
+    {
+      __mpxrt_print (VERB_DEBUG, "No BNDREGS support.\n");
+      return false;
+    }
+
+  if (!(eax & bit_BNDCSR))
+    {
+      __mpxrt_print (VERB_DEBUG, "No BNDCSR support.\n");
+      return false;
+    }
+
+  return true;
+}
+
+static void
+enable_mpx (void)
+{
+  uint8_t __attribute__ ((__aligned__ (64))) buffer[4096];
+  struct xsave_struct *xsave_buf = (struct xsave_struct *)buffer;
+
+  memset (buffer, 0, sizeof (buffer));
+  xrstor_state (xsave_buf, 0x18);
+
+  __mpxrt_print (VERB_DEBUG, "Initalizing MPX...\n");
+  __mpxrt_print (VERB_DEBUG, "  Enable bit: %d\n", enable);
+  __mpxrt_print (VERB_DEBUG, "  BNDPRESERVE bit: %d\n", bndpreserve);
+
+  /* Enable MPX */
+  xsave_buf->xsave_hdr.xstate_bv = 0x10;
+  xsave_buf->bndcsr.cfg_reg_u = (unsigned long)l1base;
+  xsave_buf->bndcsr.cfg_reg_u |= enable << MPX_ENABLE_BIT_NO;
+  xsave_buf->bndcsr.cfg_reg_u |= bndpreserve << BNDPRESERVE_BIT_NO;
+  xsave_buf->bndcsr.status_reg = 0;
+
+  xrstor_state (xsave_buf, 0x10);
+}
+
+static bool
+process_specific_init (void)
+{
+  if (!check_mpx_support ())
+    return false;
+
+  l1base = mmap (NULL, MPX_L1_SIZE, PROT_READ | PROT_WRITE,
+		 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+  if (l1base == MAP_FAILED)
+    {
+      perror ("mmap");
+      exit (EXIT_FAILURE);
+    }
+
+  enable_mpx ();
+
+  if (prctl (43))
+    {
+      __mpxrt_print (VERB_ERROR, "No MPX support\n");
+      return false;
+    }
+
+  return true;
+}
+
+static bool
+process_specific_finish (void)
+{
+  if (!check_mpx_support ())
+    return false;
+
+  if (prctl (44))
+    {
+      __mpxrt_print (VERB_ERROR, "No MPX support\n");
+      return false;
+    }
+
+  munmap (l1base, MPX_L1_SIZE);
+
+  return true;
+}
+
+static void
+setup_handler (void)
+{
+  int r,rs;
+  struct sigaction newact;
+
+  /* #BR is mapped to sigsegv */
+  int signum  = SIGSEGV;
+
+  newact.sa_handler = 0;
+  newact.sa_sigaction = handler_wrap;
+
+  /* sigset_t - signals to block while in the handler */
+  /* get the old signal mask. */
+  rs = sigprocmask (SIG_SETMASK, 0, &newact.sa_mask);
+  assert (rs == 0);
+
+  /* call sa_sigaction, not sa_handler */
+  newact.sa_flags = SA_SIGINFO;
+  /*
+   * in case we call user's handler on SIGSEGV (not bound
+   * violation exception) we want to allow bound checking
+   * inside the user handler -> nested exception
+   */
+  newact.sa_flags |= SA_NODEFER;
+
+  newact.sa_restorer = 0;
+  r = sigaction (signum, &newact, 0);
+  assert (r == 0);
+}
+
+/*
+ * set constructor priority to two to make it run after the
+ * constructor in sigaction.c
+ */
+static void __attribute__ ((constructor (1005)))
+mpxrt_prepare (void)
+{
+  __mpxrt_init_env_vars (&bndpreserve, &enable);
+  setup_handler ();
+  process_specific_init ();
+}
+
+static void __attribute__ ((destructor))
+mpxrt_cleanup (void)
+{
+  __mpxrt_print_summary (num_bnd_chk, MPX_L1_SIZE);
+  __mpxrt_utils_free ();
+  process_specific_finish ();
+}