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) {}
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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
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