1 /* 2 * Copyright (c) 2010 Konstantin Belousov <kib@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Neither the name of the author nor the names of any co-contributors 11 * may be used to endorse or promote products derived from this software 12 * without specific prior written permission. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/lib/libc/gen/elf_utils.c 217154 2011-01-08 17:13:43Z kib $ 27 */ 28 29 #include <sys/types.h> 30 #include <link.h> 31 #include <string.h> 32 #include <machine/tls.h> 33 #include "static_tls.h" 34 35 int __elf_phdr_match_addr(struct dl_phdr_info *, void *); 36 void __libc_distribute_static_tls(size_t, void *, size_t, size_t); 37 38 int 39 __elf_phdr_match_addr(struct dl_phdr_info *phdr_info, void *addr) 40 { 41 const Elf_Phdr *ph; 42 int i; 43 44 for (i = 0; i < phdr_info->dlpi_phnum; i++) { 45 ph = &phdr_info->dlpi_phdr[i]; 46 if (ph->p_type != PT_LOAD || (ph->p_flags & PF_X) == 0) 47 continue; 48 if (phdr_info->dlpi_addr + ph->p_vaddr <= (uintptr_t)addr && 49 (uintptr_t)addr + sizeof(addr) < phdr_info->dlpi_addr + 50 ph->p_vaddr + ph->p_memsz) 51 break; 52 } 53 return (i != phdr_info->dlpi_phnum); 54 } 55 56 void 57 __libc_distribute_static_tls(size_t offset, void *src, size_t len, 58 size_t total_len) 59 { 60 uintptr_t tlsbase; 61 62 tlsbase = _libc_get_static_tls_base(offset); 63 memcpy((void *)tlsbase, src, len); 64 memset((char *)tlsbase + len, 0, total_len - len); 65 } 66 67 __weak_reference(__libc_distribute_static_tls, _pthread_distribute_static_tls); 68