1 /*
 2  * Copyright (c) 2020, 2026, 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 "opto/c2_MacroAssembler.hpp"
26 #include "opto/c2_CodeStubs.hpp"
27 #include "runtime/objectMonitor.hpp"
28 #include "runtime/sharedRuntime.hpp"
29 #include "runtime/stubRoutines.hpp"
30 
31 #define __ masm.
32 
33 int C2SafepointPollStub::max_size() const {
34   return 20;
35 }
36 
37 void C2SafepointPollStub::emit(C2_MacroAssembler& masm) {
38   assert(SharedRuntime::polling_page_return_handler_blob() != nullptr,
39          "polling page return stub not created yet");
40   address stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
41 
42   RuntimeAddress callback_addr(stub);
43 
44   __ bind(entry());
45   InternalAddress safepoint_pc(masm.pc() - masm.offset() + _safepoint_offset);
46   __ adr(rscratch1, safepoint_pc);
47   __ str(rscratch1, Address(rthread, JavaThread::saved_exception_pc_offset()));
48   __ far_jump(callback_addr);
49 }
50 
51 int C2EntryBarrierStub::max_size() const {
52   return 24;
53 }
54 
55 void C2EntryBarrierStub::emit(C2_MacroAssembler& masm) {
56   __ bind(entry());
57   __ lea(rscratch1, RuntimeAddress(StubRoutines::method_entry_barrier()));
58   __ blr(rscratch1);
59   __ b(continuation());
60 
61   __ bind(guard());
62   __ emit_int32(0);   // nmethod guard value
63 }
64 
65 #undef __