| /* |
| * Copyright (c) 2020, 2025, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2020, 2023, Huawei Technologies Co., Ltd. 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 "opto/c2_CodeStubs.hpp" |
| #include "opto/c2_MacroAssembler.hpp" |
| #include "runtime/objectMonitor.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/stubRoutines.hpp" |
| |
| #define __ masm. |
| |
| int C2SafepointPollStub::max_size() const { |
| return 5 * NativeInstruction::instruction_size; |
| } |
| |
| void C2SafepointPollStub::emit(C2_MacroAssembler& masm) { |
| assert(SharedRuntime::polling_page_return_handler_blob() != nullptr, |
| "polling page return stub not created yet"); |
| address stub = SharedRuntime::polling_page_return_handler_blob()->entry_point(); |
| RuntimeAddress callback_addr(stub); |
| |
| __ bind(entry()); |
| InternalAddress safepoint_pc(__ pc() - __ offset() + _safepoint_offset); |
| __ relocate(safepoint_pc.rspec(), [&] { |
| // emits auipc + addi for address inside code cache |
| __ la(t0, safepoint_pc.target()); |
| }); |
| __ sd(t0, Address(xthread, JavaThread::saved_exception_pc_offset())); |
| // emits auipc + jr for address inside code cache |
| __ far_jump(callback_addr); |
| } |
| |
| int C2EntryBarrierStub::max_size() const { |
| // 4 bytes for alignment |
| return 4 * NativeInstruction::instruction_size + 4 + 4; |
| } |
| |
| void C2EntryBarrierStub::emit(C2_MacroAssembler& masm) { |
| __ bind(entry()); |
| // emits auipc + jalr for address inside code cache |
| __ far_call(StubRoutines::method_entry_barrier()); |
| |
| // emits auipc + jr assuming continuation is not near |
| __ j(continuation()); |
| |
| // make guard value 4-byte aligned so that it can be accessed atomically |
| __ align(4); |
| __ bind(guard()); |
| __ relocate(entry_guard_Relocation::spec()); |
| __ emit_int32(0); // nmethod guard value |
| } |
| |
| #undef __ |
