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/* $OpenBSD: dlfcn_stubs.c,v 1.18 2020/10/09 16:31:03 otto Exp $ */
/*
* Copyright (c) 1998 Per Fogelstrom, Opsycon AB
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/types.h>
#include <stddef.h>
#include <stdio.h>
#include <link.h>
#include <dlfcn.h>
#include <tib.h>
#include "init.h"
static int dlerror_ret;
void *
dlopen(const char *libname, int how)
{
if (_dl_cb != NULL && _dl_cb->dlopen != NULL)
return _dl_cb->dlopen(libname, how);
return NULL;
}
int
dlclose(void *handle)
{
if (_dl_cb != NULL && _dl_cb->dlclose != NULL)
return _dl_cb->dlclose(handle);
dlerror_ret = 1;
return -1;
}
void *
dlsym(void *handle, const char *name)
{
if (_dl_cb != NULL && _dl_cb->dlsym != NULL)
return _dl_cb->dlsym(handle, name);
dlerror_ret = 1;
return NULL;
}
int
dlctl(void *handle, int command, void *data)
{
if (_dl_cb != NULL && _dl_cb->dlctl != NULL)
return _dl_cb->dlctl(handle, command, data);
dlerror_ret = 1;
return -1;
}
DEF_WEAK(dlctl);
char *
dlerror(void)
{
if (_dl_cb != NULL && _dl_cb->dlerror != NULL)
return _dl_cb->dlerror();
if (dlerror_ret) {
dlerror_ret = 0;
return _dl_cb == NULL ? "No dynamic linker" :
"Incompatible dynamic linker";
}
return NULL;
}
int
dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
void *data)
{
if (_dl_cb != NULL && _dl_cb->dl_iterate_phdr != NULL)
return _dl_cb->dl_iterate_phdr(callback, data);
#ifndef PIC
if (_static_phdr_info.dlpi_phdr != NULL)
return callback(&_static_phdr_info, sizeof(_static_phdr_info),
data);
#endif /* !PIC */
return -1;
}
DEF_WEAK(dl_iterate_phdr);
int
dladdr(const void *addr, struct dl_info *info)
{
if (_dl_cb != NULL && _dl_cb->dladdr != NULL)
return _dl_cb->dladdr(addr, info);
dlerror_ret = 1;
return 0;
}
DEF_WEAK(dladdr);
#if 0
/* Thread Local Storage argument structure */
typedef struct {
unsigned long int ti_module;
unsigned long int ti_offset;
} tls_index;
void *__tls_get_addr(tls_index *) __attribute__((weak));
#ifdef __i386
void *___tls_get_addr(tls_index *) __attribute__((weak, __regparm__(1)));
#endif
#if defined(__amd64) || defined(__i386) || defined(__sparc64)
void *
__tls_get_addr(tls_index *ti)
{
return NULL;
}
#ifdef __i386
__attribute__((__regparm__(1))) void *
___tls_get_addr(tls_index *ti)
{
return NULL;
}
#endif /* __i386 */
#endif /* arch with TLS support enabled */
#endif
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