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("$FreeBSD$");
31 * Linkage to services provided by the dynamic linker.
37 #include "namespace.h"
39 #include "un-namespace.h"
40 #include "libc_private.h"
42 static char sorry[] = "Service unavailable";
44 void _rtld_thread_init(void *);
45 void _rtld_atfork_pre(int *);
46 void _rtld_atfork_post(int *);
49 * For ELF, the dynamic linker directly resolves references to its
50 * services to functions inside the dynamic linker itself. These
51 * weak-symbol stubs are necessary so that "ld" won't complain about
52 * undefined symbols. The stubs are executed only when the program is
53 * linked statically, or when a given service isn't implemented in the
54 * dynamic linker. They must return an error if called, and they must
55 * be weak symbols so that the dynamic linker can override them.
58 #pragma weak _rtld_error
60 _rtld_error(const char *fmt, ...)
66 dladdr(const void *addr, Dl_info *dlip)
87 #pragma weak dllockinit
89 dllockinit(void *context,
90 void *(*lock_create)(void *context),
91 void (*rlock_acquire)(void *lock),
92 void (*wlock_acquire)(void *lock),
93 void (*lock_release)(void *lock),
94 void (*lock_destroy)(void *lock),
95 void (*context_destroy)(void *context))
97 if (context_destroy != NULL)
98 context_destroy(context);
103 dlopen(const char *name, int mode)
111 dlsym(void * __restrict handle, const char * __restrict name)
119 dlfunc(void * __restrict handle, const char * __restrict name)
127 dlvsym(void * __restrict handle, const char * __restrict name,
128 const char * __restrict version)
136 dlinfo(void * __restrict handle, int request, void * __restrict p)
142 #pragma weak _rtld_thread_init
144 _rtld_thread_init(void * li)
149 static pthread_once_t dl_phdr_info_once = PTHREAD_ONCE_INIT;
150 static struct dl_phdr_info phdr_info;
153 dl_init_phdr_info(void)
158 for (auxp = __elf_aux_vector; auxp->a_type != AT_NULL; auxp++) {
159 switch (auxp->a_type) {
161 phdr_info.dlpi_addr = (Elf_Addr)auxp->a_un.a_ptr;
164 phdr_info.dlpi_name = (const char *)auxp->a_un.a_ptr;
167 phdr_info.dlpi_phdr =
168 (const Elf_Phdr *)auxp->a_un.a_ptr;
171 phdr_info.dlpi_phnum = (Elf_Half)auxp->a_un.a_val;
175 for (i = 0; i < phdr_info.dlpi_phnum; i++) {
176 if (phdr_info.dlpi_phdr[i].p_type == PT_TLS) {
177 phdr_info.dlpi_tls_modid = 1;
178 phdr_info.dlpi_tls_data =
179 (void*)phdr_info.dlpi_phdr[i].p_vaddr;
182 phdr_info.dlpi_adds = 1;
185 #pragma weak dl_iterate_phdr
187 dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
191 __init_elf_aux_vector();
192 if (__elf_aux_vector == NULL)
194 _once(&dl_phdr_info_once, dl_init_phdr_info);
195 return (callback(&phdr_info, sizeof(phdr_info), data));
200 fdlopen(int fd, int mode)
207 #pragma weak _rtld_atfork_pre
209 _rtld_atfork_pre(int *locks)
213 #pragma weak _rtld_atfork_post
215 _rtld_atfork_post(int *locks)
219 #pragma weak _rtld_addr_phdr
221 _rtld_addr_phdr(const void *addr, struct dl_phdr_info *phdr_info)
227 #pragma weak _rtld_get_stack_prot
229 _rtld_get_stack_prot(void)
232 return (PROT_EXEC | PROT_READ | PROT_WRITE);
235 #pragma weak _rtld_is_dlopened
237 _rtld_is_dlopened(void *arg)