1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef _BIONIC_CONSTANTS_H_ 18 #define _BIONIC_CONSTANTS_H_ 19 20 #define NS_PER_S 1000000000 21 22 // Size of the shadow call stack. This must be a power of 2. 23 #define SCS_SIZE (8 * 1024) 24 25 // The shadow call stack is allocated at an aligned address within a guard region of this size. The 26 // guard region must be large enough that we can allocate an SCS_SIZE-aligned SCS while ensuring 27 // that there is at least one guard page after the SCS so that a stack overflow results in a SIGSEGV 28 // instead of corrupting the allocation that comes after it. 29 #define SCS_GUARD_REGION_SIZE (16 * 1024 * 1024) 30 31 #endif // _BIONIC_CONSTANTS_H_ 32