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/* Create new context.
Copyright (C) 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Helge Deller <deller@gmx.de>, 2008.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <libintl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysdep.h>
#include <ucontext.h>
/* XXX: This implementation only handles integer arguments. */
void
__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
{
unsigned int *sp;
va_list ap;
int i;
if (argc > 8)
{
fprintf (stderr, _("\
makecontext: does not know how to handle more than 8 arguments\n"));
exit (-1);
}
/* Get stack pointer. */
sp = (unsigned int *) ucp->uc_stack.ss_sp;
/* Store address to jump to. */
ucp->uc_mcontext.sc_gr[2] = (unsigned long) func;
va_start (ap, argc);
/* Handle arguments. */
for (i = 0; i < argc; ++i)
switch (i)
{
case 0:
case 1:
case 2:
case 3:
ucp->uc_mcontext.sc_gr[26-i] = va_arg (ap, int);
break;
case 4:
case 5:
case 6:
case 7:
if (sizeof(unsigned long) == 4) {
/* 32bit: put arg7-arg4 on stack. */
sp[7-i] = va_arg (ap, int);
} else {
/* 64bit: r19-r22 are arg7-arg4. */
ucp->uc_mcontext.sc_gr[22+4-i] = va_arg (ap, int);
}
break;
}
va_end (ap);
}
weak_alias(__makecontext, makecontext)
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