2 * Copyright (c) 1998 John D. Polstra
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #if !defined(IN_LIBDL) || defined(PIC)
33 * Linkage to services provided by the dynamic linker.
39 #include "namespace.h"
41 #include "un-namespace.h"
42 #include "libc_private.h"
44 static char sorry[] = "Service unavailable";
46 void _rtld_thread_init(void *);
47 void _rtld_atfork_pre(int *);
48 void _rtld_atfork_post(int *);
51 * For ELF, the dynamic linker directly resolves references to its
52 * services to functions inside the dynamic linker itself. These
53 * weak-symbol stubs are necessary so that "ld" won't complain about
54 * undefined symbols. The stubs are executed only when the program is
55 * linked statically, or when a given service isn't implemented in the
56 * dynamic linker. They must return an error if called, and they must
57 * be weak symbols so that the dynamic linker can override them.
60 #pragma weak _rtld_error
62 _rtld_error(const char *fmt __unused, ...)
68 dladdr(const void *addr __unused, Dl_info *dlip __unused)
77 dlclose(void *handle __unused)
92 #pragma weak dllockinit
94 dllockinit(void *context,
95 void *(*lock_create)(void *context) __unused,
96 void (*rlock_acquire)(void *lock) __unused,
97 void (*wlock_acquire)(void *lock) __unused,
98 void (*lock_release)(void *lock) __unused,
99 void (*lock_destroy)(void *lock) __unused,
100 void (*context_destroy)(void *context) __unused)
103 if (context_destroy != NULL)
104 context_destroy(context);
109 dlopen(const char *name __unused, int mode __unused)
118 dlsym(void * __restrict handle __unused, const char * __restrict name __unused)
127 dlfunc(void * __restrict handle __unused, const char * __restrict name __unused)
136 dlvsym(void * __restrict handle __unused, const char * __restrict name __unused,
137 const char * __restrict version __unused)
146 dlinfo(void * __restrict handle __unused, int request __unused,
147 void * __restrict p __unused)
154 #pragma weak _rtld_thread_init
156 _rtld_thread_init(void *li __unused)
163 static pthread_once_t dl_phdr_info_once = PTHREAD_ONCE_INIT;
164 static struct dl_phdr_info phdr_info;
167 dl_init_phdr_info(void)
172 for (auxp = __elf_aux_vector; auxp->a_type != AT_NULL; auxp++) {
173 switch (auxp->a_type) {
175 phdr_info.dlpi_addr = (Elf_Addr)auxp->a_un.a_ptr;
178 phdr_info.dlpi_name = (const char *)auxp->a_un.a_ptr;
181 phdr_info.dlpi_phdr =
182 (const Elf_Phdr *)auxp->a_un.a_ptr;
185 phdr_info.dlpi_phnum = (Elf_Half)auxp->a_un.a_val;
189 for (i = 0; i < phdr_info.dlpi_phnum; i++) {
190 if (phdr_info.dlpi_phdr[i].p_type == PT_TLS) {
191 phdr_info.dlpi_tls_modid = 1;
192 phdr_info.dlpi_tls_data =
193 (void*)phdr_info.dlpi_phdr[i].p_vaddr;
196 phdr_info.dlpi_adds = 1;
200 #pragma weak dl_iterate_phdr
202 dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *) __unused,
207 __init_elf_aux_vector();
208 if (__elf_aux_vector == NULL)
210 _once(&dl_phdr_info_once, dl_init_phdr_info);
211 return (callback(&phdr_info, sizeof(phdr_info), data));
219 fdlopen(int fd __unused, int mode __unused)
226 #pragma weak _rtld_atfork_pre
228 _rtld_atfork_pre(int *locks __unused)
232 #pragma weak _rtld_atfork_post
234 _rtld_atfork_post(int *locks __unused)
238 #pragma weak _rtld_addr_phdr
240 _rtld_addr_phdr(const void *addr __unused,
241 struct dl_phdr_info *phdr_info_a __unused)
247 #pragma weak _rtld_get_stack_prot
249 _rtld_get_stack_prot(void)
252 return (PROT_EXEC | PROT_READ | PROT_WRITE);
255 #pragma weak _rtld_is_dlopened
257 _rtld_is_dlopened(void *arg __unused)
263 #endif /* !defined(IN_LIBDL) || defined(PIC) */