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76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
/*
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* Copyright (c) 2020, 2025, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2020, 2023, Huawei Technologies Co., Ltd. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "opto/c2_CodeStubs.hpp"
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#include "opto/c2_MacroAssembler.hpp"
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#include "runtime/objectMonitor.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/stubRoutines.hpp"
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#define __ masm.
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int C2SafepointPollStub::max_size() const {
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return 5 * NativeInstruction::instruction_size;
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}
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void C2SafepointPollStub::emit(C2_MacroAssembler& masm) {
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assert(SharedRuntime::polling_page_return_handler_blob() != nullptr,
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"polling page return stub not created yet");
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address stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
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RuntimeAddress callback_addr(stub);
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__ bind(entry());
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InternalAddress safepoint_pc(__ pc() - __ offset() + _safepoint_offset);
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__ relocate(safepoint_pc.rspec(), [&] {
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// emits auipc + addi for address inside code cache
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__ la(t0, safepoint_pc.target());
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});
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__ sd(t0, Address(xthread, JavaThread::saved_exception_pc_offset()));
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// emits auipc + jr for address inside code cache
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__ far_jump(callback_addr);
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}
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int C2EntryBarrierStub::max_size() const {
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// 4 bytes for alignment
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return 4 * NativeInstruction::instruction_size + 4 + 4;
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}
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void C2EntryBarrierStub::emit(C2_MacroAssembler& masm) {
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__ bind(entry());
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// emits auipc + jalr for address inside code cache
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__ far_call(StubRoutines::method_entry_barrier());
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// emits auipc + jr assuming continuation is not near
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__ j(continuation());
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// make guard value 4-byte aligned so that it can be accessed atomically
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__ align(4);
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__ bind(guard());
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__ relocate(entry_guard_Relocation::spec());
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__ emit_int32(0); // nmethod guard value
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}
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#undef __
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