1211706Skib/*
2211706Skib * Copyright (c) 2010 Konstantin Belousov <kib@freebsd.org>
3211706Skib * All rights reserved.
4211706Skib *
5211706Skib * Redistribution and use in source and binary forms, with or without
6211706Skib * modification, are permitted provided that the following conditions
7211706Skib * are met:
8211706Skib * 1. Redistributions of source code must retain the above copyright
9211706Skib *    notice, this list of conditions and the following disclaimer.
10211706Skib * 2. Neither the name of the author nor the names of any co-contributors
11211706Skib *    may be used to endorse or promote products derived from this software
12211706Skib *    without specific prior written permission.
13211706Skib *
14211706Skib * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15211706Skib * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16211706Skib * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17211706Skib * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18211706Skib * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19211706Skib * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20211706Skib * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21211706Skib * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22211706Skib * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23211706Skib * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24211706Skib * SUCH DAMAGE.
25211706Skib *
26211706Skib * $FreeBSD$
27211706Skib */
28211706Skib
29217154Skib#include <sys/types.h>
30217154Skib#include <sys/mman.h>
31217154Skib#include <sys/resource.h>
32217154Skib#include <sys/sysctl.h>
33211706Skib#include <link.h>
34217154Skib#include <stddef.h>
35211706Skib
36211706Skibint
37211706Skib__elf_phdr_match_addr(struct dl_phdr_info *phdr_info, void *addr)
38211706Skib{
39211706Skib	const Elf_Phdr *ph;
40211706Skib	int i;
41211706Skib
42211706Skib	for (i = 0; i < phdr_info->dlpi_phnum; i++) {
43211706Skib		ph = &phdr_info->dlpi_phdr[i];
44211706Skib		if (ph->p_type != PT_LOAD || (ph->p_flags & PF_X) == 0)
45211706Skib			continue;
46211706Skib		if (phdr_info->dlpi_addr + ph->p_vaddr <= (uintptr_t)addr &&
47211706Skib		    (uintptr_t)addr + sizeof(addr) < phdr_info->dlpi_addr +
48211706Skib		    ph->p_vaddr + ph->p_memsz)
49211706Skib			break;
50211706Skib	}
51211706Skib	return (i != phdr_info->dlpi_phnum);
52211706Skib}
53217154Skib
54217154Skib#pragma weak __pthread_map_stacks_exec
55217154Skibvoid
56217154Skib__pthread_map_stacks_exec(void)
57217154Skib{
58217154Skib	int mib[2];
59217154Skib	struct rlimit rlim;
60217154Skib	u_long usrstack;
61217154Skib	size_t len;
62217154Skib
63217154Skib	mib[0] = CTL_KERN;
64217154Skib	mib[1] = KERN_USRSTACK;
65217154Skib	len = sizeof(usrstack);
66217154Skib	if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), &usrstack, &len, NULL, 0)
67217154Skib	    == -1)
68217154Skib		return;
69217154Skib	if (getrlimit(RLIMIT_STACK, &rlim) == -1)
70217154Skib		return;
71217154Skib	mprotect((void *)(uintptr_t)(usrstack - rlim.rlim_cur),
72217154Skib	    rlim.rlim_cur, _rtld_get_stack_prot());
73217154Skib}
74217154Skib
75