1 /* 2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2014, 2015, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #ifndef CPU_AARCH64_GLOBALDEFINITIONS_AARCH64_HPP 27 #define CPU_AARCH64_GLOBALDEFINITIONS_AARCH64_HPP 28 29 const int StackAlignmentInBytes = 16; 30 31 // Indicates whether the C calling conventions require that 32 // 32-bit integer argument values are extended to 64 bits. 33 const bool CCallingConventionRequiresIntsAsLongs = false; 34 35 #define SUPPORTS_NATIVE_CX8 36 37 // aarch64 is not CPU_MULTI_COPY_ATOMIC 38 39 // According to the ARMv8 ARM, "Concurrent modification and execution 40 // of instructions can lead to the resulting instruction performing 41 // any behavior that can be achieved by executing any sequence of 42 // instructions that can be executed from the same Exception level, 43 // except where the instruction before modification and the 44 // instruction after modification is a B, BL, NOP, BKPT, SVC, HVC, or 45 // SMC instruction." 46 // 47 // This makes the games we play when patching difficult, so when we 48 // come across an access that needs patching we deoptimize. There are 49 // ways we can avoid this, but these would slow down C1-compiled code 50 // in the defauilt case. We could revisit this decision if we get any 51 // evidence that it's worth doing. 52 #define DEOPTIMIZE_WHEN_PATCHING 53 54 #define SUPPORT_RESERVED_STACK_AREA 55 56 #define THREAD_LOCAL_POLL 57 58 #endif // CPU_AARCH64_GLOBALDEFINITIONS_AARCH64_HPP