1 /* 2 * Copyright (c) 2020, 2022, 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 "precompiled.hpp" 26 #include "opto/c2_MacroAssembler.hpp" 27 #include "opto/c2_CodeStubs.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() != NULL, 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 __ movptr(rscratch1, (uintptr_t) StubRoutines::aarch64::method_entry_barrier()); 58 __ blr(rscratch1); 59 __ b(continuation()); 60 61 __ bind(guard()); 62 __ relocate(entry_guard_Relocation::spec()); 63 __ emit_int32(0); // nmethod guard value 64 } 65 66 #undef __