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/*
* rtems-ctor.cc
*
* Description:
* This file exists solely to (try to) ensure RTEMS is initialized
* before any global constructors are run.
*
* The problem:
* Global constructors might reasonably expect that new() will
* work, but since new() uses malloc() which uses RTEMS regions,
* it can not be called until after initialize_executive().
*
* Global constructors are called in GNU systems one of 2 ways:
*
* an "invisible" call to __main() inserted by compiler
* This __main() calls __do_global_ctors() which
* walks thru the table and calls all global
* constructors.
*
* or -
* A special section is put into the linked binary. The
* system startup code knows to run the constructors in
* this special section before calling main().
*
* By making RTEMS initialization a constructor, we avoid having
* too much about all this. All we have to guarantee is that
* this constructor is the first one run.
*
*
* So for the first case above, this is what happens
*
* host crt0
* main()
* __main()
* __do_global_ctors()
* bsp_start()
* init_executive_early()
* <<any other constructors>>
*
* rtems_init_executive_late()
* bsp_cleanup()
*
* TODO:
*
*
* COPYRIGHT (c) 1989-1997.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may in
* the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id:
*/
#include <bsp.h>
/*
* RTEMS program name
* Probably not used by anyone, but it is nice to have it.
* Actually the UNIX version of CPU_INVOKE_DEBUGGER will probably
* need to use it
*/
char *rtems_progname;
char **rtems_environp;
#ifdef USE_CONSTRUCTORS_FOR_INIT_EXEC
class RTEMS {
public:
RTEMS();
~RTEMS();
};
RTEMS rtems_constructor;
RTEMS::RTEMS()
{
bsp_start();
}
RTEMS::~RTEMS()
{
bsp_cleanup();
}
#endif
extern "C" {
int
main(int argc,
char **argv,
char **environp)
{
#ifndef USE_CONSTRUCTORS_FOR_INIT_EXEC
bsp_start();
#endif
if ((argc > 0) && argv && argv[0])
rtems_progname = argv[0];
else
rtems_progname = "RTEMS";
rtems_environp = environp;
/*
* Start multitasking
*/
rtems_initialize_executive_late( bsp_isr_level );
#ifndef USE_CONSTRUCTORS_FOR_INIT_EXEC
bsp_cleanup();
#endif
/*
* Returns when multitasking is stopped
* This allows our destructors to get run normally
*/
return 0;
}
}
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