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
33#include <sys/param.h>
34#include <sys/types.h>
35#include <sys/sysctl.h>
36#include <assert.h>
37#include <signal.h>
38#include <stdarg.h>
39#include <stdlib.h>
40#include <string.h>
41#include <stdio.h>
42
43#include "rtld.h"
44#include "rtld_printf.h"
45#include "rtld_libc.h"
46
47/*
48 * Avoid dependencies from various libc calls on abort(). Since this is only
49 * used for assertions in RTLD, we can just raise SIGABRT directly.
50 */
51void
52abort(void)
53{
54	raise(SIGABRT);
55	__builtin_trap();
56}
57
58static int rtld_errno;
59int *__error(void);
60int *
61__error(void)
62{
63
64	return (&rtld_errno);
65}
66
67/* Avoid dependency on __libc_interposing, use the system call directly. */
68#undef sigprocmask
69int
70sigprocmask(int how, const sigset_t *set, sigset_t *oset)
71{
72
73	return (__sys_sigprocmask(how, set, oset));
74}
75__strong_reference(sigprocmask, __libc_sigprocmask);
76
77#if defined DEBUG || !defined(NDEBUG)
78/* Provide an implementation of __assert that does not pull in fprintf() */
79void
80__assert(const char *func, const char *file, int line, const char *failedexpr)
81{
82
83	if (func == NULL)
84		(void)rtld_fdprintf(STDERR_FILENO,
85		    "Assertion failed: (%s), file %s, line %d.\n", failedexpr,
86		    file, line);
87	else
88		(void)rtld_fdprintf(STDERR_FILENO,
89		    "Assertion failed: (%s), function %s, file %s, line %d.\n",
90		    failedexpr, func, file, line);
91	abort();
92	/* NOTREACHED */
93}
94#endif
95
96/*
97 * Avoid pulling in all of pthreads from getpagesize().
98 * It normally uses libc/gen/auxv.c which pulls in pthread_once().
99 * This relies on init_pagesizes setting page_size so must not be called
100 * before that.
101 */
102int
103getpagesize(void)
104{
105	return (page_size);
106}
107
108int __sys___sysctl(const int *name, u_int namelen, void *oldp,
109    size_t *oldlenp, const void *newp, size_t newlen);
110
111int
112sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
113    const void *newp, size_t newlen)
114{
115	int retval;
116
117	assert(name[0] != CTL_USER && "Not supported inside rtld!");
118	retval = __sys___sysctl(name, namelen, oldp, oldlenp, newp, newlen);
119	return (retval);
120}
121