1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright 2019 Alex Richardson <arichardson@FreeBSD.org> 5 * 6 * This software was developed by SRI International and the University of 7 * Cambridge Computer Laboratory (Department of Computer Science and 8 * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the 9 * DARPA SSITH research programme. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 #include <sys/cdefs.h> 35 #include <sys/param.h> 36 #include <sys/types.h> 37 #include <sys/sysctl.h> 38 #include <assert.h> 39 #include <signal.h> 40 #include <stdarg.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <stdio.h> 44 45 #include "rtld.h" 46 #include "rtld_printf.h" 47 #include "rtld_libc.h" 48 49 /* 50 * Avoid dependencies from various libc calls on abort(). Since this is only 51 * used for assertions in RTLD, we can just raise SIGABRT directly. 52 */ 53 void 54 abort(void) 55 { 56 raise(SIGABRT); 57 __builtin_trap(); 58 } 59 60 static int rtld_errno; 61 int *__error(void); 62 int * 63 __error(void) 64 { 65 66 return (&rtld_errno); 67 } 68 69 /* Avoid dependency on __libc_interposing, use the system call directly. */ 70 #undef sigprocmask 71 int 72 sigprocmask(int how, const sigset_t *set, sigset_t *oset) 73 { 74 75 return (__sys_sigprocmask(how, set, oset)); 76 } 77 __strong_reference(sigprocmask, __libc_sigprocmask); 78 79 #if defined DEBUG || !defined(NDEBUG) 80 /* Provide an implementation of __assert that does not pull in fprintf() */ 81 void 82 __assert(const char *func, const char *file, int line, const char *failedexpr) 83 { 84 85 if (func == NULL) 86 (void)rtld_fdprintf(STDERR_FILENO, 87 "Assertion failed: (%s), file %s, line %d.\n", failedexpr, 88 file, line); 89 else 90 (void)rtld_fdprintf(STDERR_FILENO, 91 "Assertion failed: (%s), function %s, file %s, line %d.\n", 92 failedexpr, func, file, line); 93 abort(); 94 /* NOTREACHED */ 95 } 96 #endif 97 98 /* 99 * Avoid pulling in all of pthreads from getpagesize(). 100 * It normally uses libc/gen/auxv.c which pulls in pthread_once(). 101 * This relies on init_pagesizes setting page_size so must not be called 102 * before that. 103 */ 104 int 105 getpagesize(void) 106 { 107 return (page_size); 108 } 109 110 extern int __sys___sysctl(const int *name, u_int namelen, void *oldp, 111 size_t *oldlenp, const void *newp, size_t newlen); 112 113 int 114 sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp, 115 const void *newp, size_t newlen) 116 { 117 int retval; 118 119 assert(name[0] != CTL_USER && "Not supported inside rtld!"); 120 retval = __sys___sysctl(name, namelen, oldp, oldlenp, newp, newlen); 121 return (retval); 122 } 123