8020433: Crash when using -XX:+RestoreMXCSROnJNICalls

Remove StubRoutines::x86::_mxcsr_std and use StubRoutines::_mxcsr_std

Reviewed-by: jrose

hotspot/src/cpu/x86/vm/stubGenerator_x86_64.cpp

@@ -279,7 +279,7 @@ class StubGenerator: public StubCodeGenerator {
       __ stmxcsr(mxcsr_save);
       __ movl(rax, mxcsr_save);
       __ andl(rax, MXCSR_MASK);    // Only check control and mask bits
-      ExternalAddress mxcsr_std(StubRoutines::x86::mxcsr_std());
+      ExternalAddress mxcsr_std(StubRoutines::addr_mxcsr_std());
       __ cmp32(rax, mxcsr_std);
       __ jcc(Assembler::equal, skip_ldmx);
       __ ldmxcsr(mxcsr_std);
@@ -729,17 +729,18 @@ class StubGenerator: public StubCodeGenerator {
 
     if (CheckJNICalls) {
       Label ok_ret;
+      ExternalAddress mxcsr_std(StubRoutines::addr_mxcsr_std());
       __ push(rax);
       __ subptr(rsp, wordSize);      // allocate a temp location
       __ stmxcsr(mxcsr_save);
       __ movl(rax, mxcsr_save);
       __ andl(rax, MXCSR_MASK);    // Only check control and mask bits
-      __ cmpl(rax, *(int *)(StubRoutines::x86::mxcsr_std()));
+      __ cmp32(rax, mxcsr_std);
       __ jcc(Assembler::equal, ok_ret);
 
       __ warn("MXCSR changed by native JNI code, use -XX:+RestoreMXCSROnJNICall");
 
-      __ ldmxcsr(ExternalAddress(StubRoutines::x86::mxcsr_std()));
+      __ ldmxcsr(mxcsr_std);
 
       __ bind(ok_ret);
       __ addptr(rsp, wordSize);
@@ -3729,12 +3730,35 @@ class StubGenerator: public StubCodeGenerator {
     return stub->entry_point();
   }
 
+  void create_control_words() {
+    // Round to nearest, 53-bit mode, exceptions masked
+    StubRoutines::_fpu_cntrl_wrd_std   = 0x027F;
+    // Round to zero, 53-bit mode, exception mased
+    StubRoutines::_fpu_cntrl_wrd_trunc = 0x0D7F;
+    // Round to nearest, 24-bit mode, exceptions masked
+    StubRoutines::_fpu_cntrl_wrd_24    = 0x007F;
+    // Round to nearest, 64-bit mode, exceptions masked
+    StubRoutines::_fpu_cntrl_wrd_64    = 0x037F;
+    // Round to nearest, 64-bit mode, exceptions masked
+    StubRoutines::_mxcsr_std           = 0x1F80;
+    // Note: the following two constants are 80-bit values
+    //       layout is critical for correct loading by FPU.
+    // Bias for strict fp multiply/divide
+    StubRoutines::_fpu_subnormal_bias1[0]= 0x00000000; // 2^(-15360) == 0x03ff 8000 0000 0000 0000
+    StubRoutines::_fpu_subnormal_bias1[1]= 0x80000000;
+    StubRoutines::_fpu_subnormal_bias1[2]= 0x03ff;
+    // Un-Bias for strict fp multiply/divide
+    StubRoutines::_fpu_subnormal_bias2[0]= 0x00000000; // 2^(+15360) == 0x7bff 8000 0000 0000 0000
+    StubRoutines::_fpu_subnormal_bias2[1]= 0x80000000;
+    StubRoutines::_fpu_subnormal_bias2[2]= 0x7bff;
+  }
+
   // Initialization
   void generate_initial() {
     // Generates all stubs and initializes the entry points
 
-    // This platform-specific stub is needed by generate_call_stub()
+    // This platform-specific settings are needed by generate_call_stub()
-    StubRoutines::x86::_mxcsr_std        = generate_fp_mask("mxcsr_std",        0x0000000000001F80);
+    create_control_words();
 
     // entry points that exist in all platforms Note: This is code
     // that could be shared among different platforms - however the

hotspot/src/cpu/x86/vm/stubRoutines_x86_64.cpp

@@ -42,4 +42,3 @@ address StubRoutines::x86::_float_sign_mask = NULL;
 address StubRoutines::x86::_float_sign_flip = NULL;
 address StubRoutines::x86::_double_sign_mask = NULL;
 address StubRoutines::x86::_double_sign_flip = NULL;
-address StubRoutines::x86::_mxcsr_std = NULL;

hotspot/src/cpu/x86/vm/stubRoutines_x86_64.hpp

@@ -52,7 +52,6 @@ class x86 {
   static address _float_sign_flip;
   static address _double_sign_mask;
   static address _double_sign_flip;
-  static address _mxcsr_std;
 
  public:
 
@@ -106,11 +105,6 @@ class x86 {
     return _double_sign_flip;
   }
 
-  static address mxcsr_std()
-  {
-    return _mxcsr_std;
-  }
-
 # include "stubRoutines_x86.hpp"
 
 };

hotspot/test/compiler/cpuflags/RestoreMXCSR.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8020433
+ * @summary Crash when using -XX:+RestoreMXCSROnJNICalls
+ * @library /testlibrary
+ *
+ */
+import com.oracle.java.testlibrary.*;
+
+public class RestoreMXCSR {
+  public static void main(String[] args) throws Exception {
+    ProcessBuilder pb;
+    OutputAnalyzer out;
+
+    pb = ProcessTools.createJavaProcessBuilder("-XX:+RestoreMXCSROnJNICalls", "-version");
+    out = new OutputAnalyzer(pb.start());
+    out.shouldHaveExitValue(0);
+  }
+}