Set default load address for launchers on s390x

Sets the load address of the launchers to 0x60000 on zlinux 64 systems. This enables compressed references with heaps larger then 1.8GB

Signed-off-by: Morgan Davies <[email protected]>

make/launcher/LauncherCommon.gmk

@@ -23,6 +23,11 @@
 # questions.
 #
 
+# ===========================================================================
+# (c) Copyright IBM Corp. 2019, 2019 All Rights Reserved
+# ===========================================================================
+#
+
 include JdkNativeCompilation.gmk
 
 ORIGIN_ARG := $(call SET_EXECUTABLE_ORIGIN,/../lib/jli)
@@ -93,6 +98,16 @@ JAVA_MANIFEST := $(TOPDIR)/src/java.base/windows/native/launcher/java.manifest
 SetupBuildLauncher = $(NamedParamsMacroTemplate)
 define SetupBuildLauncherBody
   # Setup default values (unless overridden)
+
+  ifeq ($(OPENJDK_TARGET_OS), linux)
+  # Set the image base address for zLinux 64 to 0x60000 for launchers,
+  # allows compressedRefsShift to be 0 when -Xmx is set to 2040m or more.
+  # / RTC PR 100052
+    ifeq ($(OPENJDK_TARGET_CPU), s390x)
+      $1_LDFLAGS += -Wl,-Ttext-segment=0x60000
+    endif
+  endif
+
   ifeq ($$($1_OPTIMIZATION), )
     $1_OPTIMIZATION := LOW
   endif