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kernel: implement _Exit to support exit

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Lephe 2021-05-29 16:29:50 +02:00
parent 2f6f49feea
commit 850544349c
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GPG key ID: 1BBA026E13FC0495
1 changed files with 26 additions and 7 deletions
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33
src/kernel/start.c
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@ -9,6 +9,8 @@
#include <gint/gint.h>
#include <gint/hardware.h>
#include <gint/exc.h>
#include <setjmp.h>
#include <stdlib.h>
#include "kernel.h"
@ -46,6 +48,12 @@ void gint_setrestart(int restart)
gint_restart = restart;
}
/* Jumping there will properly unwind and leave the add-in (CASIOWIN does not
have an exit syscall and simply wants you to return from main()) */
jmp_buf gint_exitbuf;
/* Return value of main() */
static int gint_exitcode;
/* regcpy(): Copy a memory region using symbol information
@l Source pointer (load address)
@s Size of area (should be a multiple of 16)
@ -173,18 +181,22 @@ int start(int isappli, int optnum)
hosted user application, which has its own constructors and
destructors to work with. */
callarray(&bctors, &ectors);
int rc = 1;
while(1)
{
rc = main(isappli, optnum);
/* Here, we use exit() to allow the standard library to do
what it wants in exit() after main() finishes executing */
if(!setjmp(gint_exitbuf)) {
callarray(&bctors, &ectors);
exit(main(isappli, optnum));
}
else {
callarray(&bdtors, &edtors);
}
if(!gint_restart) break;
gint_osmenu();
}
callarray(&bdtors, &edtors);
/* Before leaving the application, we need to clean everything we
changed to hardware settings and peripheral modules. The OS is bound
to be confused (and hang, or crash, or any other kind of giving up)
@ -193,5 +205,12 @@ int start(int isappli, int optnum)
/* Unload gint and give back control to the system. Driver settings
will be restored while interrupts are disabled */
kquit();
return rc;
return gint_exitcode;
}
/* Standard _Exit, used by the fxlibc exit() to leave control */
void _Exit(int rc)
{
gint_exitcode = rc;
longjmp(gint_exitbuf, 1);
}