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/*
* COPYRIGHT (c) 2012 Chris Johns <chrisj@rtems.org>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
/**
* @file
*
* @ingroup rtl
*
* @brief RTEMS POSIX Dynamic Module Loading Interface.
*
* This is the POSIX interface to run-time loading of code into RTEMS.
*/
#include <stdint.h>
#include <dlfcn.h>
#include <rtems/rtl/rtl.h>
static rtems_rtl_obj_t*
dl_get_obj_from_handle (void* handle)
{
rtems_rtl_obj_t* obj;
/*
* Handle the special cases provided in NetBSD and Sun documentation.
* http://download.oracle.com/docs/cd/E19253-01/816-5168/dlsym-3c/index.html
* We currently do not manage the loading dependences in the module mappings
* so we cannot handle the searching based on loading order where overriding
* can occur.
*/
if ((handle == RTLD_DEFAULT) || (handle == RTLD_SELF))
obj = rtems_rtl_baseimage ();
else
obj = rtems_rtl_check_handle (handle);
return obj;
}
void*
dlopen (const char* name, int mode)
{
rtems_rtl_obj_t* obj = NULL;
if (!rtems_rtl_lock ())
return NULL;
_rtld_debug.r_state = RT_ADD;
_rtld_debug_state ();
if (name)
obj = rtems_rtl_load_object (name, mode);
else
obj = rtems_rtl_baseimage ();
_rtld_debug.r_state = RT_CONSISTENT;
_rtld_debug_state();
rtems_rtl_unlock ();
return obj;
}
int
dlclose (void* handle)
{
rtems_rtl_obj_t* obj;
int r;
if (!rtems_rtl_lock ())
return -1;
obj = rtems_rtl_check_handle (handle);
if (!obj)
{
rtems_rtl_unlock ();
return -1;
}
_rtld_debug.r_state = RT_DELETE;
_rtld_debug_state ();
r = rtems_rtl_unload_object (obj) ? 0 : -1;
_rtld_debug.r_state = RT_CONSISTENT;
_rtld_debug_state ();
rtems_rtl_unlock ();
return r;
}
void*
dlsym (void* handle, const char *symbol)
{
rtems_rtl_obj_t* obj;
rtems_rtl_obj_sym_t* sym = NULL;
void* symval = NULL;
if (!rtems_rtl_lock ())
return NULL;
/*
* If the handle is "default" search the global symbol table.
*/
if (handle == RTLD_DEFAULT)
{
sym = rtems_rtl_symbol_global_find (symbol);
}
else
{
obj = dl_get_obj_from_handle (handle);
if (obj)
sym = rtems_rtl_symbol_obj_find (obj, symbol);
}
if (sym)
symval = sym->value;
rtems_rtl_unlock ();
return symval;
}
const char*
dlerror (void)
{
static char msg[64];
rtems_rtl_get_error (msg, sizeof (msg));
return msg;
}
int
dlinfo (void* handle, int request, void* p)
{
rtems_rtl_obj_t* obj;
int rc = -1;
if (!rtems_rtl_lock () || !p)
return -1;
obj = dl_get_obj_from_handle (handle);
if (obj)
{
switch (request)
{
case RTLD_DI_UNRESOLVED:
*((int*) p) = rtems_rtl_obj_unresolved (obj) ? 1 : 0;
rc = 0;
break;
default:
break;
}
}
rtems_rtl_unlock ();
return rc;
}
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