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.
38 static char sorry[] = "Service unavailable";
41 * For ELF, the dynamic linker directly resolves references to its
42 * services to functions inside the dynamic linker itself. These
43 * weak-symbol stubs are necessary so that "ld" won't complain about
44 * undefined symbols. The stubs are executed only when the program is
45 * linked statically, or when a given service isn't implemented in the
46 * dynamic linker. They must return an error if called, and they must
47 * be weak symbols so that the dynamic linker can override them.
50 #pragma weak _rtld_error
52 _rtld_error(const char *fmt, ...)
58 dladdr(const void *addr, Dl_info *dlip)
79 #pragma weak dllockinit
81 dllockinit(void *context,
82 void *(*lock_create)(void *context),
83 void (*rlock_acquire)(void *lock),
84 void (*wlock_acquire)(void *lock),
85 void (*lock_release)(void *lock),
86 void (*lock_destroy)(void *lock),
87 void (*context_destroy)(void *context))
89 if (context_destroy != NULL)
90 context_destroy(context);
95 dlopen(const char *name, int mode)
103 dlsym(void * __restrict handle, const char * __restrict name)
111 dlfunc(void * __restrict handle, const char * __restrict name)
119 dlvsym(void * __restrict handle, const char * __restrict name,
120 const char * __restrict version)
128 dlinfo(void * __restrict handle, int request, void * __restrict p)
134 #pragma weak _rtld_thread_init
136 _rtld_thread_init(void * li)
141 #pragma weak dl_iterate_phdr
143 dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
150 #pragma weak _rtld_atfork_pre
152 _rtld_atfork_pre(int *locks)
156 #pragma weak _rtld_atfork_post
158 _rtld_atfork_post(int *locks)
162 #pragma weak _rtld_addr_phdr
164 _rtld_addr_phdr(const void *addr, struct dl_phdr_info *phdr_info)
170 #pragma weak _rtld_get_stack_prot
172 _rtld_get_stack_prot(void)
175 return (PROT_EXEC | PROT_READ | PROT_WRITE);