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 #ifdef COMPILER2
27 #include "asm/macroAssembler.hpp"
28 #include "asm/macroAssembler.inline.hpp"
29 #include "code/vmreg.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "opto/runtime.hpp"
32 #include "runtime/sharedRuntime.hpp"
33 #include "runtime/stubRoutines.hpp"
34 #include "runtime/vframeArray.hpp"
35 #include "utilities/globalDefinitions.hpp"
36 #include "vmreg_x86.inline.hpp"
37
38 class SimpleRuntimeFrame {
39
40 public:
41
42 // Most of the runtime stubs have this simple frame layout.
43 // This class exists to make the layout shared in one place.
44 // Offsets are for compiler stack slots, which are jints.
45 enum layout {
46 // The frame sender code expects that rbp will be in the "natural" place and
47 // will override any oopMap setting for it. We must therefore force the layout
48 // so that it agrees with the frame sender code.
249 // Results:
250 // rax: exception oop
251 // rdx: exception pc in caller or ???
252 // destination: exception handler of caller
253 //
254 // Note: the exception pc MUST be at a call (precise debug information)
255 // Registers rax, rdx, rcx, rsi, rdi, r8-r11 are not callee saved.
256 //
257
258 void OptoRuntime::generate_exception_blob() {
259 assert(!OptoRuntime::is_callee_saved_register(RDX_num), "");
260 assert(!OptoRuntime::is_callee_saved_register(RAX_num), "");
261 assert(!OptoRuntime::is_callee_saved_register(RCX_num), "");
262
263 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
264
265 // Allocate space for the code
266 ResourceMark rm;
267 // Setup code generation tools
268 CodeBuffer buffer("exception_blob", 2048, 1024);
269 MacroAssembler* masm = new MacroAssembler(&buffer);
270
271
272 address start = __ pc();
273
274 // Exception pc is 'return address' for stack walker
275 __ push(rdx);
276 __ subptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Prolog
277
278 // Save callee-saved registers. See x86_64.ad.
279
280 // rbp is an implicitly saved callee saved register (i.e., the calling
281 // convention will save/restore it in the prolog/epilog). Other than that
282 // there are no callee save registers now that adapter frames are gone.
283
284 __ movptr(Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt), rbp);
285
286 // Store exception in Thread object. We cannot pass any arguments to the
287 // handle_exception call, since we do not want to make any assumption
288 // about the size of the frame where the exception happened in.
289 // c_rarg0 is either rdi (Linux) or rcx (Windows).
290 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()),rax);
291 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), rdx);
297 // registers of the frame being removed.
298 //
299 // address OptoRuntime::handle_exception_C(JavaThread* thread)
300
301 // At a method handle call, the stack may not be properly aligned
302 // when returning with an exception.
303 address the_pc = __ pc();
304 __ set_last_Java_frame(noreg, noreg, the_pc, rscratch1);
305 __ mov(c_rarg0, r15_thread);
306 __ andptr(rsp, -(StackAlignmentInBytes)); // Align stack
307 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
308
309 // Set an oopmap for the call site. This oopmap will only be used if we
310 // are unwinding the stack. Hence, all locations will be dead.
311 // Callee-saved registers will be the same as the frame above (i.e.,
312 // handle_exception_stub), since they were restored when we got the
313 // exception.
314
315 OopMapSet* oop_maps = new OopMapSet();
316
317 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
318
319 __ reset_last_Java_frame(false);
320
321 // Restore callee-saved registers
322
323 // rbp is an implicitly saved callee-saved register (i.e., the calling
324 // convention will save restore it in prolog/epilog) Other than that
325 // there are no callee save registers now that adapter frames are gone.
326
327 __ movptr(rbp, Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt));
328
329 __ addptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Epilog
330 __ pop(rdx); // No need for exception pc anymore
331
332 // rax: exception handler
333
334 // We have a handler in rax (could be deopt blob).
335 __ mov(r8, rax);
336
337 // Get the exception oop
338 __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset()));
339 // Get the exception pc in case we are deoptimized
340 __ movptr(rdx, Address(r15_thread, JavaThread::exception_pc_offset()));
341 #ifdef ASSERT
342 __ movptr(Address(r15_thread, JavaThread::exception_handler_pc_offset()), NULL_WORD);
343 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), NULL_WORD);
344 #endif
345 // Clear the exception oop so GC no longer processes it as a root.
346 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()), NULL_WORD);
347
348 // rax: exception oop
349 // r8: exception handler
350 // rdx: exception pc
351 // Jump to handler
352
353 __ jmp(r8);
354
355 // Make sure all code is generated
356 masm->flush();
357
358 // Set exception blob
359 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1);
360 }
361 #endif // COMPILER2
|
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 #ifdef COMPILER2
27 #include "asm/macroAssembler.hpp"
28 #include "asm/macroAssembler.inline.hpp"
29 #include "code/SCCache.hpp"
30 #include "code/vmreg.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "opto/runtime.hpp"
33 #include "runtime/sharedRuntime.hpp"
34 #include "runtime/stubRoutines.hpp"
35 #include "runtime/vframeArray.hpp"
36 #include "utilities/globalDefinitions.hpp"
37 #include "vmreg_x86.inline.hpp"
38
39 class SimpleRuntimeFrame {
40
41 public:
42
43 // Most of the runtime stubs have this simple frame layout.
44 // This class exists to make the layout shared in one place.
45 // Offsets are for compiler stack slots, which are jints.
46 enum layout {
47 // The frame sender code expects that rbp will be in the "natural" place and
48 // will override any oopMap setting for it. We must therefore force the layout
49 // so that it agrees with the frame sender code.
250 // Results:
251 // rax: exception oop
252 // rdx: exception pc in caller or ???
253 // destination: exception handler of caller
254 //
255 // Note: the exception pc MUST be at a call (precise debug information)
256 // Registers rax, rdx, rcx, rsi, rdi, r8-r11 are not callee saved.
257 //
258
259 void OptoRuntime::generate_exception_blob() {
260 assert(!OptoRuntime::is_callee_saved_register(RDX_num), "");
261 assert(!OptoRuntime::is_callee_saved_register(RAX_num), "");
262 assert(!OptoRuntime::is_callee_saved_register(RCX_num), "");
263
264 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
265
266 // Allocate space for the code
267 ResourceMark rm;
268 // Setup code generation tools
269 CodeBuffer buffer("exception_blob", 2048, 1024);
270 int pc_offset = 0;
271 if (SCCache::load_exception_blob(&buffer, &pc_offset)) {
272 OopMapSet* oop_maps = new OopMapSet();
273 oop_maps->add_gc_map(pc_offset, new OopMap(SimpleRuntimeFrame::framesize, 0));
274
275 // Set exception blob
276 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1);
277 return;
278 }
279
280 MacroAssembler* masm = new MacroAssembler(&buffer);
281 address start = __ pc();
282
283 // Exception pc is 'return address' for stack walker
284 __ push(rdx);
285 __ subptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Prolog
286
287 // Save callee-saved registers. See x86_64.ad.
288
289 // rbp is an implicitly saved callee saved register (i.e., the calling
290 // convention will save/restore it in the prolog/epilog). Other than that
291 // there are no callee save registers now that adapter frames are gone.
292
293 __ movptr(Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt), rbp);
294
295 // Store exception in Thread object. We cannot pass any arguments to the
296 // handle_exception call, since we do not want to make any assumption
297 // about the size of the frame where the exception happened in.
298 // c_rarg0 is either rdi (Linux) or rcx (Windows).
299 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()),rax);
300 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), rdx);
306 // registers of the frame being removed.
307 //
308 // address OptoRuntime::handle_exception_C(JavaThread* thread)
309
310 // At a method handle call, the stack may not be properly aligned
311 // when returning with an exception.
312 address the_pc = __ pc();
313 __ set_last_Java_frame(noreg, noreg, the_pc, rscratch1);
314 __ mov(c_rarg0, r15_thread);
315 __ andptr(rsp, -(StackAlignmentInBytes)); // Align stack
316 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
317
318 // Set an oopmap for the call site. This oopmap will only be used if we
319 // are unwinding the stack. Hence, all locations will be dead.
320 // Callee-saved registers will be the same as the frame above (i.e.,
321 // handle_exception_stub), since they were restored when we got the
322 // exception.
323
324 OopMapSet* oop_maps = new OopMapSet();
325
326 pc_offset = the_pc - start;
327 oop_maps->add_gc_map(pc_offset, new OopMap(SimpleRuntimeFrame::framesize, 0));
328
329 __ reset_last_Java_frame(false);
330
331 // Restore callee-saved registers
332
333 // rbp is an implicitly saved callee-saved register (i.e., the calling
334 // convention will save restore it in prolog/epilog) Other than that
335 // there are no callee save registers now that adapter frames are gone.
336
337 __ movptr(rbp, Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt));
338
339 __ addptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Epilog
340 __ pop(rdx); // No need for exception pc anymore
341
342 // rax: exception handler
343
344 // We have a handler in rax (could be deopt blob).
345 __ mov(r8, rax);
346
347 // Get the exception oop
348 __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset()));
349 // Get the exception pc in case we are deoptimized
350 __ movptr(rdx, Address(r15_thread, JavaThread::exception_pc_offset()));
351 #ifdef ASSERT
352 __ movptr(Address(r15_thread, JavaThread::exception_handler_pc_offset()), NULL_WORD);
353 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), NULL_WORD);
354 #endif
355 // Clear the exception oop so GC no longer processes it as a root.
356 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()), NULL_WORD);
357
358 // rax: exception oop
359 // r8: exception handler
360 // rdx: exception pc
361 // Jump to handler
362
363 __ jmp(r8);
364
365 // Make sure all code is generated
366 masm->flush();
367
368 SCCache::store_exception_blob(&buffer, pc_offset);
369 // Set exception blob
370 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1);
371 }
372 #endif // COMPILER2
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