1 /* 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/codeCache.hpp" 27 #include "code/nmethod.hpp" 28 #include "runtime/frame.hpp" 29 #include "runtime/init.hpp" 30 #include "runtime/os.hpp" 31 #include "utilities/debug.hpp" 32 #include "utilities/top.hpp" 33 34 void pd_ps(frame f) {} 35 36 #ifndef PRODUCT 37 // return an instruction which will generate a SIGILL 38 bool get_illegal_instruction_sequence(uint8_t buf[8]) { 39 const uint8_t sequence[] = { 40 #if defined(AMD64) 41 // 06 => invalid instruction for x64 42 0x06 43 #else 44 // Note: privileged instructions won't work, because they cause a SIGSEGV 45 // on Linux, not a SIGILL. "0f 0e" and "0f 0f" are invalid opcodes which 46 // will cause real SIGILL resp. EXCEPTION_ILLEGAL_INSTRUCTION. 47 0x0f, 0x0f, 48 // in case this does not work, use a HLT which should be privilegued. 49 0xF4 50 #endif 51 }; 52 memcpy(buf, sequence, sizeof(sequence)); 53 return true; 54 } 55 #endif 56