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141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright 2019 Alex Richardson <arichardson@FreeBSD.org>
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory (Department of Computer Science and
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* Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
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* DARPA SSITH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <assert.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "rtld.h"
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#include "rtld_printf.h"
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#include "rtld_libc.h"
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/*
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* Avoid dependencies from various libc calls on abort(). Since this is only
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* used for assertions in RTLD, we can just raise SIGABRT directly.
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*/
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void
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abort(void)
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{
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raise(SIGABRT);
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__builtin_trap();
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}
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static int rtld_errno;
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int *__error(void);
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int *
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__error(void)
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{
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return (&rtld_errno);
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}
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/* Avoid dependency on __libc_interposing, use the system call directly. */
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#undef sigprocmask
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int
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sigprocmask(int how, const sigset_t *set, sigset_t *oset)
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{
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return (__sys_sigprocmask(how, set, oset));
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}
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__strong_reference(sigprocmask, __libc_sigprocmask);
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#if defined DEBUG || !defined(NDEBUG)
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/* Provide an implementation of __assert that does not pull in fprintf() */
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void
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__assert(const char *func, const char *file, int line, const char *failedexpr)
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{
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if (func == NULL)
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(void)rtld_fdprintf(STDERR_FILENO,
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"Assertion failed: (%s), file %s, line %d.\n", failedexpr,
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file, line);
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else
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(void)rtld_fdprintf(STDERR_FILENO,
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"Assertion failed: (%s), function %s, file %s, line %d.\n",
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failedexpr, func, file, line);
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abort();
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/* NOTREACHED */
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}
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#endif
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/*
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* Avoid pulling in all of pthreads from getpagesize().
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* It normally uses libc/gen/auxv.c which pulls in pthread_once().
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*/
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int
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getpagesize(void)
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{
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int mib[2], value;
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size_t size;
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static int pagesize;
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if (pagesize != 0)
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return (pagesize);
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if (npagesizes > 0)
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pagesize = pagesizes[0];
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if (pagesize == 0) {
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mib[0] = CTL_HW;
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mib[1] = HW_PAGESIZE;
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size = sizeof(value);
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if (sysctl(mib, nitems(mib), &value, &size, NULL, 0) == -1)
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pagesize = PAGE_SIZE;
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else
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pagesize = value;
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}
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return (pagesize);
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}
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extern int __sys___sysctl(const int *name, u_int namelen, void *oldp,
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size_t *oldlenp, const void *newp, size_t newlen);
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int
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sysctl(const int *name, u_int namelen, void *oldp, size_t *oldlenp,
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const void *newp, size_t newlen)
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{
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int retval;
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assert(name[0] != CTL_USER && "Not supported inside rtld!");
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retval = __sys___sysctl(name, namelen, oldp, oldlenp, newp, newlen);
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return (retval);
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}
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