1 /* 2 * Copyright (C) 2016 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 #include <stdint.h> 18 #include <stdlib.h> 19 #include <crt_priv.h> 20 callVectors(const void * from_addr,const void * to_addr)21static void callVectors(const void *from_addr, const void *to_addr) 22 { 23 typedef void (* const callVect)(void); 24 callVect *start = (callVect *)from_addr; 25 callVect *end = (callVect *)to_addr; 26 const int32_t step = from_addr < to_addr ? 1 : -1; 27 const int32_t count = step > 0 ? end - start : start - end; 28 29 // basic sanity check 30 if (&start[step * count] != end) 31 return; 32 33 for (; start != end; start += step) { 34 callVect vec = *start; 35 if (vec != NULL) 36 vec(); 37 } 38 } 39 __crt_init(void)40void __crt_init(void) 41 { 42 extern uint32_t __init_array_start[]; 43 extern uint32_t __init_array_end[]; 44 45 callVectors(__init_array_start, __init_array_end); 46 } 47 __crt_exit(void)48void __crt_exit(void) 49 { 50 extern uint32_t __fini_array_start[]; 51 extern uint32_t __fini_array_end[]; 52 extern uint32_t __bss_end[]; 53 extern uint32_t __got_start[]; 54 55 // call global destructors 56 callVectors(__fini_array_start, __fini_array_end); 57 if (&__fini_array_end[1] <= __got_start) { 58 // call registered static destructors 59 callVectors(__bss_end + __fini_array_end[0] * (sizeof(uint32_t)), __bss_end); 60 } 61 } 62