xref: /dflybsd-src/lib/libc/gen/elf_utils.c (revision eeb6957159b8d414a4ad6de31c473c8cd565972b)

/*
 * Copyright (c) 2010 Konstantin Belousov <kib@freebsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: head/lib/libc/gen/elf_utils.c 217154 2011-01-08 17:13:43Z kib $
 */

#include <sys/types.h>
#include <link.h>
#include <string.h>
#include <machine/tls.h>
#include "static_tls.h"

int __elf_phdr_match_addr(struct dl_phdr_info *, void *);
void __libc_distribute_static_tls(size_t, void *, size_t, size_t);

int
__elf_phdr_match_addr(struct dl_phdr_info *phdr_info, void *addr)
{
	const Elf_Phdr *ph;
	int i;

	for (i = 0; i < phdr_info->dlpi_phnum; i++) {
		ph = &phdr_info->dlpi_phdr[i];
		if (ph->p_type != PT_LOAD || (ph->p_flags & PF_X) == 0)
			continue;
		if (phdr_info->dlpi_addr + ph->p_vaddr <= (uintptr_t)addr &&
		    (uintptr_t)addr + sizeof(addr) < phdr_info->dlpi_addr +
		    ph->p_vaddr + ph->p_memsz)
			break;
	}
	return (i != phdr_info->dlpi_phnum);
}

void
__libc_distribute_static_tls(size_t offset, void *src, size_t len,
			     size_t total_len)
{
	uintptr_t tlsbase;

	tlsbase = _libc_get_static_tls_base(offset);
	memcpy((void *)tlsbase, src, len);
	memset((char *)tlsbase + len, 0, total_len - len);
}

__weak_reference(__libc_distribute_static_tls, _pthread_distribute_static_tls);