/*
 * Copyright (c) 1999, 2010, 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.
 *
 */

#include "precompiled.hpp"
#include "code/codeCache.hpp"
#include "code/nmethod.hpp"
#include "runtime/frame.hpp"
#include "runtime/init.hpp"
#include "runtime/os.hpp"
#include "utilities/debug.hpp"
#include "utilities/top.hpp"

void pd_ps(frame f) {}

#ifndef PRODUCT
// return an instruction which will generate a SIGILL
bool get_illegal_instruction_sequence(uint8_t buf[8]) {
  const uint8_t sequence[] = {
#if defined(AMD64)
    // 06 => invalid instruction for x64
    0x06
#else
    // Note: privileged instructions won't work, because they cause a SIGSEGV 
    // on Linux, not a SIGILL. "0f 0e" and "0f 0f" are invalid opcodes which 
    // will cause real SIGILL resp. EXCEPTION_ILLEGAL_INSTRUCTION.
    0x0f, 0x0f,
    // in case this does not work, use a HLT which should be privilegued.
    0xF4
#endif
  };
  memcpy(buf, sequence, sizeof(sequence));
  return true;
}
#endif