/* Copyright (C) 2001-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Jakub Jelinek <jakub@redhat.com>.

   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, see

   <http://www.gnu.org/licenses/>.  */

#include <ucontext.h>

extern int __getcontext (ucontext_t *ucp);

extern int __setcontext (const ucontext_t *ucp, int restoremask);

int

__swapcontext (ucontext_t *oucp, const ucontext_t *ucp)

{

  extern void __swapcontext_ret (void);

  /* Save the current machine context to oucp.  */

  __getcontext (oucp);

  /* Modify oucp to skip the __setcontext call on reactivation.  */

  oucp->uc_mcontext.mc_gregs[MC_PC] = (long) __swapcontext_ret;

  oucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) __swapcontext_ret) + 4;

  /* Restore the machine context in ucp.  */

  __setcontext (ucp, 1);

  return 0;

}

asm ("							\n\

	.text						\n\

	.type	__swapcontext_ret, #function		\n\

__swapcontext_ret:					\n\

	return	%i7 + 8					\n\

	 clr	%o0					\n\

	.size	__swapcontext_ret, .-__swapcontext_ret	\n\

     ");

weak_alias (__swapcontext, swapcontext)