1 /*- 2 * SPDX-License-Identifier: BSD-1-Clause 3 * 4 * Copyright 2018 Andrew Turner 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 13 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 14 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 15 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 16 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 17 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 18 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 19 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 21 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 22 */ 23 24 #include <sys/types.h> 25 #include "crt.h" 26 27 typedef void (*crt_func)(void); 28 29 #ifdef HAVE_CTORS 30 31 /* 32 * On some architectures and toolchains we may need to call the .ctors. 33 * These are called in the reverse order they are in the ELF file. 34 */ 35 static void __do_global_ctors_aux(void) __used; 36 37 static crt_func __CTOR_END__[] __section(".ctors") __used = { 38 (crt_func)0 39 }; 40 static crt_func __DTOR_END__[] __section(".dtors") __used = { 41 (crt_func)0 42 }; 43 44 extern const char startof_ctors[] __asm(".startof..ctors") 45 __weak_symbol __hidden; 46 47 static void 48 __do_global_ctors_aux(void) 49 { 50 crt_func fn; 51 uintptr_t ctors_start; 52 int n; 53 54 ctors_start = (uintptr_t)&startof_ctors; 55 for (n = 1;; n++) { 56 fn = __CTOR_END__[-n]; 57 if (fn == (crt_func)0 || fn == (crt_func)-1 || 58 (ctors_start > 0 && 59 (uintptr_t)&__CTOR_END__[-n] < ctors_start)) 60 break; 61 fn(); 62 } 63 } 64 65 asm ( 66 ".pushsection .init \n" 67 "\t" INIT_CALL_SEQ(__do_global_ctors_aux) "\n" 68 ".popsection \n" 69 ); 70 #endif 71