/*

 * Copyright 2007, 2008, 2010, 2018, Red Hat, Inc.

 * 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.

 *

 */

  static void setup_fpu() {}

  static bool is_allocatable(size_t bytes);

  // Used to register dynamic code cache area with the OS

  // Note: Currently only used in 64 bit Windows implementations

  static bool register_code_area(char *low, char *high) { return true; }

  // Atomically copy 64 bits of data

  static void atomic_copy64(const volatile void *src, volatile void *dst) {

#if defined(PPC32) && !defined(__SPE__)

    double tmp;

    asm volatile ("lfd  %0, %2\n"

                  "stfd %0, %1\n"

                  : "=&f"(tmp), "=Q"(*(volatile double*)dst)

                  : "Q"(*(volatile double*)src));

#elif defined(PPC32) && defined(__SPE__)

    long tmp;

    asm volatile ("evldd  %0, %2\n"

                  "evstdd %0, %1\n"

                  : "=&r"(tmp), "=Q"(*(volatile long*)dst)

                  : "Q"(*(volatile long*)src));

#elif defined(S390) && !defined(_LP64)

    double tmp;

    asm volatile ("ld  %0, %2\n"

                  "std %0, %1\n"

                  : "=&f"(tmp), "=Q"(*(volatile double*)dst)

                  : "Q"(*(volatile double*)src));

#elif defined(__ARM_ARCH_7A__)

    // Note that a ldrexd + clrex combination is only needed for

    // correctness on the OS level (context-switches). In this

    // case, clrex *may* be beneficial for performance. For now

    // don't bother with clrex as this is Zero.

    jlong tmp;

    asm volatile ("ldrexd  %0, [%1]\n"

                  : "=r"(tmp)

                  : "r"(src), "m"(src));

    *(jlong *) dst = tmp;

#else

    *(jlong *) dst = *(const jlong *) src;

#endif

  }