diff --git a/base-codezero/run/env b/base-codezero/run/env
index bfdaec3ab1..94d16cb8b6 100644
--- a/base-codezero/run/env
+++ b/base-codezero/run/env
@@ -83,6 +83,24 @@ proc build_boot_image {binaries} {
 }
 
 
-proc run_genode_until {{wait_for_re forever} {timeout_value 0}} {
-	spawn_qemu $wait_for_re $timeout_value }
+proc run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
+	#
+	# If a running_spawn_id is specified, wait for the expected output
+	#
+	if {$running_spawn_id != -1} {
+		wait_for_output $wait_for_re $timeout_value $running_spawn_id
+		return
+	}
 
+	#
+	# Try to use one of the supported backends for running the scripts
+	#
+	if {[is_qemu_available]} {
+		spawn_qemu $wait_for_re $timeout_value
+		return
+	}
+
+	global run_target
+	puts stderr "Error: Can't execute automatically on target '$run_target'"
+	exit -1
+}
diff --git a/base-fiasco/run/env b/base-fiasco/run/env
index 9570743765..bd30b38332 100644
--- a/base-fiasco/run/env
+++ b/base-fiasco/run/env
@@ -172,10 +172,28 @@ proc build_boot_image {binaries} {
 }
 
 
-proc run_genode_until {{wait_for_re forever} {timeout_value 0}} {
-	if {[is_amt_available]} {
-		spawn_amt $wait_for_re $timeout_value;
-	} else {
-		spawn_qemu $wait_for_re $timeout_value;
+proc run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
+	#
+	# If a running_spawn_id is specified, wait for the expected output
+	#
+	if {$running_spawn_id != -1} {
+		wait_for_output $wait_for_re $timeout_value $running_spawn_id
+		return
 	}
+
+	#
+	# Try to use one of the supported backends for running the scripts
+	#
+	if {[is_amt_available]} {
+		spawn_amt $wait_for_re $timeout_value
+		return
+	}
+	if {[is_qemu_available]} {
+		spawn_qemu $wait_for_re $timeout_value
+		return
+	}
+
+	global run_target
+	puts stderr "Error: Can't execute automatically on target '$run_target'"
+	exit -1
 }
diff --git a/base-foc/run/env b/base-foc/run/env
index e1f851b89b..f33b4e2455 100644
--- a/base-foc/run/env
+++ b/base-foc/run/env
@@ -278,10 +278,24 @@ proc build_boot_image {binaries} {
 }
 
 
-proc run_genode_until {{wait_for_re forever} {timeout_value 0}} {
+proc run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
+	#
+	# If a running_spawn_id is specified, wait for the expected output
+	#
+	if {$running_spawn_id != -1} {
+		wait_for_output $wait_for_re $timeout_value $running_spawn_id
+		return
+	}
+
+	#
+	# Try to use one of the supported backends for running the scripts
+	#
 	if {[is_amt_available]} {
-		spawn_amt $wait_for_re $timeout_value;
-	} else {
-		spawn_qemu $wait_for_re $timeout_value;
+		spawn_amt $wait_for_re $timeout_value
+		return
+	}
+	if {[is_qemu_available]} {
+		spawn_qemu $wait_for_re $timeout_value
+		return
 	}
 }
diff --git a/base-hw/run/env b/base-hw/run/env
index 6787459529..433c19f7bb 100644
--- a/base-hw/run/env
+++ b/base-hw/run/env
@@ -204,7 +204,26 @@ proc build_boot_image {binaries} {
 }
 
 
-proc run_genode_until {{wait_for_re forever} {timeout_value 0}} {
+proc run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
+	#
+	# If a running_spawn_id is specified, wait for the expected output
+	#
+	if {$running_spawn_id != -1} {
+		wait_for_output $wait_for_re $timeout_value $running_spawn_id
+		return
+	}
+
+	#
+	# Try to use one of the supported backends for running the scripts
+	#
+#	if {[is_amt_available]} {
+#		spawn_amt $wait_for_re $timeout_value
+#		return
+#	}
+#	if {[is_qemu_available]} {
+#		spawn_qemu $wait_for_re $timeout_value
+#		return
+#	}
 
 	if {[target] == "qemu"} { spawn_qemu $wait_for_re $timeout_value
 	} else {
diff --git a/base-linux/run/env b/base-linux/run/env
index 675a451323..ad701b04b9 100644
--- a/base-linux/run/env
+++ b/base-linux/run/env
@@ -26,7 +26,15 @@ proc build_boot_image {binaries} {
 }
 
 
-proc run_genode_until {{wait_for_re forever} {timeout_value 0}} {
+proc run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
+	#
+	# If a running_spawn_id is specified, wait for the expected output
+	#
+	if {$running_spawn_id != -1} {
+		wait_for_output $wait_for_re $timeout_value $running_spawn_id
+		return
+	}
+
 	global output
 	set timeout $timeout_value
 	set orig_pwd [pwd]
diff --git a/base-nova/run/env b/base-nova/run/env
index 31fe477cf3..a78beb3f13 100644
--- a/base-nova/run/env
+++ b/base-nova/run/env
@@ -118,10 +118,24 @@ proc build_boot_image {binaries} {
 }
 
 
-proc run_genode_until {{wait_for_re forever} {timeout_value 0}} {
+proc run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
+	#
+	# If a running_spawn_id is specified, wait for the expected output
+	#
+	if {$running_spawn_id != -1} {
+		wait_for_output $wait_for_re $timeout_value $running_spawn_id
+		return
+	}
+
+	#
+	# Try to use one of the supported backends for running the scripts
+	#
 	if {[is_amt_available]} {
-		spawn_amt $wait_for_re $timeout_value;
-	} else {
-		spawn_qemu $wait_for_re $timeout_value;
+		spawn_amt $wait_for_re $timeout_value
+		return
+	}
+	if {[is_qemu_available]} {
+		spawn_qemu $wait_for_re $timeout_value
+		return
 	}
 }
diff --git a/base-okl4/run/env b/base-okl4/run/env
index 9f2904506d..7e5fb0085b 100644
--- a/base-okl4/run/env
+++ b/base-okl4/run/env
@@ -235,10 +235,28 @@ proc build_boot_image {binaries} {
 }
 
 
-proc run_genode_until {{wait_for_re forever} {timeout_value 0}} {
-	if {[is_amt_available]} {
-		spawn_amt $wait_for_re $timeout_value;
-	} else {
-		spawn_qemu $wait_for_re $timeout_value;
+proc run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
+	#
+	# If a running_spawn_id is specified, wait for the expected output
+	#
+	if {$running_spawn_id != -1} {
+		wait_for_output $wait_for_re $timeout_value $running_spawn_id
+		return
 	}
+
+	#
+	# Try to use one of the supported backends for running the scripts
+	#
+	if {[is_amt_available]} {
+		spawn_amt $wait_for_re $timeout_value
+		return
+	}
+	if {[is_qemu_available]} {
+		spawn_qemu $wait_for_re $timeout_value
+		return
+	}
+
+	global run_target
+	puts stderr "Error: Can't execute automatically on target '$run_target'"
+	exit -1
 }
diff --git a/base-pistachio/run/env b/base-pistachio/run/env
index 890a014fe1..c0ce135295 100644
--- a/base-pistachio/run/env
+++ b/base-pistachio/run/env
@@ -151,10 +151,28 @@ proc build_boot_image {binaries} {
 }
 
 
-proc run_genode_until {{wait_for_re forever} {timeout_value 0}} {
-	if {[is_amt_available]} {
-		spawn_amt $wait_for_re $timeout_value;
-	} else {
-		spawn_qemu $wait_for_re $timeout_value;
+proc run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
+	#
+	# If a running_spawn_id is specified, wait for the expected output
+	#
+	if {$running_spawn_id != -1} {
+		wait_for_output $wait_for_re $timeout_value $running_spawn_id
+		return
 	}
+
+	#
+	# Try to use one of the supported backends for running the scripts
+	#
+	if {[is_amt_available]} {
+		spawn_amt $wait_for_re $timeout_value
+		return
+	}
+	if {[is_qemu_available]} {
+		spawn_qemu $wait_for_re $timeout_value
+		return
+	}
+
+	global run_target
+	puts stderr "Error: Can't execute automatically on target '$run_target'"
+	exit -1
 }
diff --git a/tool/run b/tool/run
index a16654631d..5947250fb6 100755
--- a/tool/run
+++ b/tool/run
@@ -111,6 +111,7 @@ proc build_boot_image {binaries} { }
 #
 # \param  wait_for_re    regular expression that matches the test completion
 # \param  timeout_value  timeout in seconds
+# \param  spawn_id       spawn_id of a already running and spawned process
 # \global output         contains the core output (modified)
 #
 # If the function is called without any argument, Genode is executed in
@@ -122,7 +123,7 @@ proc build_boot_image {binaries} { }
 # This function must be implemented by the platform-specific test environment.
 # If not implemented, the program exits with the error code -3.
 #
-proc run_genode_until {{wait_for_re forever} {timeout_value 0}} {
+proc run_genode_until {{wait_for_re forever} {timeout_value 0} {running_spawn_id -1}} {
 	puts stderr "Error: 'run_genode_until' is not implemented for this platform"
 	exit -3
 }
@@ -420,7 +421,7 @@ proc wait_for_output { wait_for_re timeout_value running_spawn_id } {
 
 	expect {
 		-i $running_spawn_id -re $wait_for_re { }
-		eof     { puts stderr "Error: Qemu died unexpectedly";   exit -3 }
+		eof     { puts stderr "Error: Spawned process died unexpectedly";   exit -3 }
 		timeout { puts stderr "Error: Test execution timed out"; exit -2 }
 	}
 	set output $expect_out(buffer)