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//
// @(#)rtems-ctor.cc 1.6 - 95/04/25
//
/*
* 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>>
*
* init_executive_late()
* bsp_cleanup()
*
* TODO:
*
* $Id$
*/
#include <bsp.h>
#include <stdio.h>
#include <stdlib.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;
class RTEMS {
public:
RTEMS();
~RTEMS();
};
RTEMS rtems_constructor;
RTEMS::RTEMS()
{
bsp_start();
}
RTEMS::~RTEMS()
{
bsp_cleanup();
}
extern "C" {
extern void invoke_non_gnu_constructors(void);
int
main(int argc,
char **argv,
char **environp)
{
rtems_argc = argc;
rtems_argv = argv;
rtems_envp = environp;
if ((argc > 0) && argv && argv[0])
rtems_progname = argv[0];
else
rtems_progname = "RTEMS";
/*
* run any non-gnu constructors we may need
*/
invoke_non_gnu_constructors();
/*
* Start multitasking
*/
rtems_initialize_executive_late( bsp_isr_level );
/*
* Returns when multitasking is stopped
* This allows our destructors to get run normally
*/
fflush( stdout );
fflush( stderr );
return 0;
}
}
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