diff --git a/bash-4.2/Makefile.in b/bash-4.2/Makefile.in
index 6692ac4..77e6f22 100644
--- a/bash-4.2/Makefile.in
+++ b/bash-4.2/Makefile.in
@@ -431,10 +431,26 @@ HSOURCES = shell.h flags.h trap.h hashcmd.h hashlib.h jobs.h builtins.h \
 	   subst.h externs.h siglist.h bashhist.h bashline.h bashtypes.h \
 	   array.h arrayfunc.h sig.h mailcheck.h bashintl.h bashjmp.h \
 	   execute_cmd.h parser.h pathexp.h pathnames.h pcomplete.h assoc.h \
-	   $(BASHINCFILES)
+	   $(BASHINCFILES) $(PROBES_H)
 
 SOURCES	 = $(CSOURCES) $(HSOURCES) $(BUILTIN_DEFS)
 
+# The tapset.
+TAPSET_SRCDIR=$(srcdir)/tapset
+
+# Probe point declarations.
+PROBES_SRC = @PROBES_SRC@
+PROBES_H = @PROBES_H@
+PROBES_O = @PROBES_O@
+DTRACE = @DTRACE@
+
+probes.h: probes.d
+	$(DTRACE) -C -h -s $< -o $@
+
+probes.o: probes.d
+	$(DTRACE) -C -G -s $< -o $@
+
+
 # header files chosen based on running of configure
 SIGNAMES_H = @SIGNAMES_H@
 
@@ -449,8 +465,9 @@ OBJECTS	 = shell.o eval.o y.tab.o general.o make_cmd.o print_cmd.o $(GLOBO) \
 	   expr.o flags.o $(JOBS_O) subst.o hashcmd.o hashlib.o mailcheck.o \
 	   trap.o input.o unwind_prot.o pathexp.o sig.o test.o version.o \
 	   alias.o array.o arrayfunc.o assoc.o braces.o bracecomp.o bashhist.o \
-	   bashline.o $(SIGLIST_O) list.o stringlib.o locale.o findcmd.o redir.o \
-	   pcomplete.o pcomplib.o syntax.o xmalloc.o $(SIGNAMES_O)
+	   bashline.o $(SIGLIST_O) list.o stringlib.o locale.o findcmd.o \
+           redir.o pcomplete.o pcomplib.o syntax.o xmalloc.o $(SIGNAMES_O) \
+           $(PROBES_O)
 
 # Where the source code of the shell builtins resides.
 BUILTIN_SRCDIR=$(srcdir)/builtins
diff --git a/bash-4.2/config.h.in b/bash-4.2/config.h.in
index 4ef846b..fd892a9 100644
--- a/bash-4.2/config.h.in
+++ b/bash-4.2/config.h.in
@@ -1139,6 +1139,9 @@
 
 /* End additions for lib/readline */
 
+/* Define to 1 if using probes */
+#undef HAVE_SYSTEMTAP
+
 #include "config-bot.h"
 
 #endif /* _CONFIG_H_ */
diff --git a/bash-4.2/configure.in b/bash-4.2/configure.in
index ff1e73c..668f38b 100644
--- a/bash-4.2/configure.in
+++ b/bash-4.2/configure.in
@@ -1109,6 +1109,51 @@ case "$srcdir" in
 	;;
 esac
 
+AC_MSG_CHECKING([whether to include systemtap tracing support])
+AC_ARG_ENABLE([systemtap],
+              [AS_HELP_STRING([--enable-systemtap],
+                              [Enable inclusion of systemtap trace support])],
+              [ENABLE_SYSTEMTAP="${enableval}"], [ENABLE_SYSTEMTAP='no'])
+
+AC_MSG_RESULT(${ENABLE_SYSTEMTAP})
+
+PROBES_SRC=
+PROBES_H=
+PROBES_O=
+ 
+if test "x${ENABLE_SYSTEMTAP}" = xyes; then
+  AC_CHECK_PROGS(DTRACE, dtrace)
+  if test -z "$DTRACE"; then
+    AC_MSG_ERROR([dtrace not found])
+  fi
+    AC_CHECK_HEADER([sys/sdt.h], [SDT_H_FOUND='yes'],
+                [SDT_H_FOUND='no';
+                   AC_MSG_ERROR([systemtap support needs sys/sdt.h header])])
+
+  AC_DEFINE(HAVE_SYSTEMTAP)
+  PROBES_SRC=probes.d
+  PROBES_H=probes.h
+  PROBES_O=probes.o
+  DTRACE=dtrace
+  AC_ARG_WITH([tapset-install-dir],
+              [AS_HELP_STRING([--with-tapset-install-dir],
+                              [The absolute path where the tapset dir will be installed])],
+              [if test "x${withval}" = x; then
+                 ABS_TAPSET_DIR="\$(datadir)/systemtap/tapset"
+               else
+                 ABS_TAPSET_DIR="${withval}"
+               fi], [ABS_TAPSET_DIR="\$(datadir)/systemtap/tapset"])
+  AC_SUBST(ABS_TAPSET_DIR)
+fi
+
+AC_SUBST(PROBES_SRC)
+AC_SUBST(PROBES_H)
+AC_SUBST(PROBES_O)
+AC_SUBST(DTRACE)
+
+
+
+
 BUILD_DIR=`pwd`
 case "$BUILD_DIR" in
 *\ *)	BUILD_DIR=`echo "$BUILD_DIR" | sed 's: :\\\\ :g'` ;;
@@ -1161,3 +1206,5 @@ AC_OUTPUT([Makefile builtins/Makefile lib/readline/Makefile lib/glob/Makefile \
 # Makefile uses this timestamp file to record whether config.h is up to date.
 echo timestamp > stamp-h
 ])
+
+
diff --git a/bash-4.2/probes.d b/bash-4.2/probes.d
new file mode 100644
index 0000000..0812e62
--- /dev/null
+++ b/bash-4.2/probes.d
@@ -0,0 +1,3 @@
+provider bash {
+	probe bash_start();
+}