--- a/src/jdk.crypto.cryptoki/share/native/libj2pkcs11/p11_general.c	Fri Jun 14 03:50:25 2019 +0200
+++ b/src/jdk.crypto.cryptoki/share/native/libj2pkcs11/p11_general.c	Fri Jun 14 10:02:57 2019 +0200
@@ -51,6 +51,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
+#include "jlong.h"
 
 #include "sun_security_pkcs11_wrapper_PKCS11.h"
 
@@ -96,8 +97,8 @@
 Java_sun_security_pkcs11_wrapper_PKCS11_freeMechanism
 (JNIEnv *env, jclass thisClass, jlong ckpMechanism) {
     if (ckpMechanism != 0L) {
-        freeCKMechanismPtr((CK_MECHANISM_PTR) ckpMechanism);
-        TRACE1("DEBUG PKCS11_freeMechanism: free pMech = %x\n", (jlong)ckpMechanism);
+        freeCKMechanismPtr(jlong_to_ptr(ckpMechanism));
+        TRACE1("DEBUG PKCS11_freeMechanism: free pMech = %x\n", ckpMechanism);
     }
     return 0L;
 }

--- a/src/jdk.crypto.cryptoki/share/native/libj2pkcs11/p11_sign.c	Fri Jun 14 03:50:25 2019 +0200
+++ b/src/jdk.crypto.cryptoki/share/native/libj2pkcs11/p11_sign.c	Fri Jun 14 10:02:57 2019 +0200
@@ -91,8 +91,8 @@
             (ckpMechanism->pParameter == NULL)) {
         freeCKMechanismPtr(ckpMechanism);
     } else {
-        (*env)->SetLongField(env, jMechanism, mech_pHandleID, (jlong)ckpMechanism);
-        TRACE1("DEBUG C_SignInit: stored pMech = 0x%lX\n", (jlong)ckpMechanism);
+        (*env)->SetLongField(env, jMechanism, mech_pHandleID, ptr_to_jlong(ckpMechanism));
+        TRACE1("DEBUG C_SignInit: stored pMech = 0x%lX\n", ptr_to_jlong(ckpMechanism));
     }
     TRACE0("FINISHED\n");
 }
@@ -303,8 +303,8 @@
             (ckpMechanism->pParameter == NULL)) {
         freeCKMechanismPtr(ckpMechanism);
     } else {
-        (*env)->SetLongField(env, jMechanism, mech_pHandleID, (jlong)ckpMechanism);
-        TRACE1("DEBUG C_SignRecoverInit, stored pMech = 0x%lX\n", (jlong)ckpMechanism);
+        (*env)->SetLongField(env, jMechanism, mech_pHandleID, ptr_to_jlong(ckpMechanism));
+        TRACE1("DEBUG C_SignRecoverInit, stored pMech = 0x%lX\n", ptr_to_jlong(ckpMechanism));
     }
     TRACE0("FINISHED\n");
 }
@@ -413,8 +413,8 @@
             (ckpMechanism->pParameter == NULL)) {
         freeCKMechanismPtr(ckpMechanism);
     } else {
-        (*env)->SetLongField(env, jMechanism, mech_pHandleID, (jlong)ckpMechanism);
-        TRACE1("DEBUG C_VerifyInit: stored pMech = 0x%lX\n", (jlong)ckpMechanism);
+        (*env)->SetLongField(env, jMechanism, mech_pHandleID, ptr_to_jlong(ckpMechanism));
+        TRACE1("DEBUG C_VerifyInit: stored pMech = 0x%lX\n", ptr_to_jlong(ckpMechanism));
     }
     TRACE0("FINISHED\n");
 }
@@ -601,8 +601,8 @@
             (ckpMechanism->pParameter == NULL)) {
         freeCKMechanismPtr(ckpMechanism);
     } else {
-        (*env)->SetLongField(env, jMechanism, mech_pHandleID, (jlong)ckpMechanism);
-        TRACE1("DEBUG C_VerifyRecoverInit: stored pMech = 0x%lX\n", (jlong)ckpMechanism);
+        (*env)->SetLongField(env, jMechanism, mech_pHandleID, ptr_to_jlong(ckpMechanism));
+        TRACE1("DEBUG C_VerifyRecoverInit: stored pMech = 0x%lX\n", ptr_to_jlong(ckpMechanism));
     }
     TRACE0("FINISHED\n");
 }