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 */
53void
54abort(void)
55{
56	raise(SIGABRT);
57	__builtin_trap();
58}
59
60static int rtld_errno;
61int *__error(void);
62int *
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
71int
72sigprocmask(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() */
81void
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 */
102int
103getpagesize(void)
104{
105	int mib[2], value;
106	size_t size;
107	static int pagesize;
108
109	if (pagesize != 0)
110		return (pagesize);
111
112	if (npagesizes > 0)
113		pagesize = pagesizes[0];
114
115	if (pagesize == 0) {
116		mib[0] = CTL_HW;
117		mib[1] = HW_PAGESIZE;
118		size = sizeof(value);
119		if (sysctl(mib, nitems(mib), &value, &size, NULL, 0) == -1)
120			pagesize = PAGE_SIZE;
121		else
122			pagesize = value;
123	}
124
125	return (pagesize);
126}
127
128extern int __sys___sysctl(const int *name, u_int namelen, void *oldp,
129    size_t *oldlenp, const void *newp, size_t newlen);
130
131int
132sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
133    const void *newp, size_t newlen)
134{
135	int retval;
136
137	assert(name[0] != CTL_USER && "Not supported inside rtld!");
138	retval = __sys___sysctl(name, namelen, oldp, oldlenp, newp, newlen);
139	return (retval);
140}
141