1 /* $OpenBSD: elf_aux_info.c,v 1.1 2024/07/14 09:48:48 jca Exp $ */ 2 3 /* 4 * Copyright (c) 2024 Jeremie Courreges-Anglas <jca@wxcvbn.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/auxv.h> 21 22 #include <errno.h> 23 24 extern int _pagesize; 25 extern unsigned long _hwcap, _hwcap2; 26 extern int _hwcap_avail, _hwcap2_avail; 27 28 int 29 elf_aux_info(int request, void *buf, int buflen) 30 { 31 int ret = 0; 32 33 if (buflen < 0) 34 return EINVAL; 35 36 switch (request) { 37 case AT_HWCAP: 38 if (buflen != sizeof(unsigned long)) 39 ret = EINVAL; 40 else if (!_hwcap_avail) 41 ret = ENOENT; 42 else 43 *(unsigned long *)buf = _hwcap; 44 break; 45 case AT_HWCAP2: 46 if (buflen != sizeof(unsigned long)) 47 ret = EINVAL; 48 else if (!_hwcap2_avail) 49 ret = ENOENT; 50 else 51 *(unsigned long *)buf = _hwcap2; 52 break; 53 case AT_PAGESZ: 54 if (buflen != sizeof(int)) 55 ret = EINVAL; 56 else if (!_pagesize) 57 ret = ENOENT; 58 else 59 *(int *)buf = _pagesize; 60 break; 61 default: 62 if (request < 0 || request >= AT_COUNT) 63 ret = EINVAL; 64 else 65 ret = ENOENT; 66 break; 67 } 68 69 return ret; 70 } 71