2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2010 Konstantin Belousov <kib@freebsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Neither the name of the author nor the names of any co-contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/types.h>
33 #include <sys/resource.h>
34 #include <sys/sysctl.h>
38 #include "libc_private.h"
39 #include "static_tls.h"
41 void __pthread_map_stacks_exec(void);
42 void __pthread_distribute_static_tls(size_t, void *, size_t, size_t);
45 __elf_phdr_match_addr(struct dl_phdr_info *phdr_info, void *addr)
50 for (i = 0; i < phdr_info->dlpi_phnum; i++) {
51 ph = &phdr_info->dlpi_phdr[i];
52 if (ph->p_type != PT_LOAD)
55 /* ELFv1 ABI for powerpc64 passes function descriptor
56 * pointers around, not function pointers. The function
57 * descriptors live in .opd, which is a non-executable segment.
58 * The PF_X check would therefore make all address checks fail,
59 * causing a crash in some instances. Don't skip over
60 * non-executable segments in the ELFv1 powerpc64 case.
62 #if !defined(__powerpc64__) || (defined(_CALL_ELF) && _CALL_ELF == 2)
63 if ((ph->p_flags & PF_X) == 0)
67 if (phdr_info->dlpi_addr + ph->p_vaddr <= (uintptr_t)addr &&
68 (uintptr_t)addr + sizeof(addr) < phdr_info->dlpi_addr +
69 ph->p_vaddr + ph->p_memsz)
72 return (i != phdr_info->dlpi_phnum);
76 __libc_map_stacks_exec(void)
84 mib[1] = KERN_USRSTACK;
85 len = sizeof(usrstack);
86 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), &usrstack, &len, NULL, 0)
89 if (getrlimit(RLIMIT_STACK, &rlim) == -1)
91 mprotect((void *)(uintptr_t)(usrstack - rlim.rlim_cur),
92 rlim.rlim_cur, _rtld_get_stack_prot());
95 #pragma weak __pthread_map_stacks_exec
97 __pthread_map_stacks_exec(void)
100 ((void (*)(void))__libc_interposing[INTERPOS_map_stacks_exec])();
104 __libc_distribute_static_tls(size_t offset, void *src, size_t len,
109 tlsbase = _libc_get_static_tls_base(offset);
110 memcpy((void *)tlsbase, src, len);
111 memset((char *)tlsbase + len, 0, total_len - len);
114 #pragma weak __pthread_distribute_static_tls
116 __pthread_distribute_static_tls(size_t offset, void *src, size_t len,
120 ((void (*)(size_t, void *, size_t, size_t))__libc_interposing[
121 INTERPOS_distribute_static_tls])(offset, src, len, total_len);