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

   This file is part of the GNU C Library.

   Contributed by David Mosberger-Tang <davidm@hpl.hp.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 <sysdep.h>

#include <features.h>

/* When a context set up by __makecontext() is activated, control

   transfers to __start_context.  When we get here:

	b1 = entry point of function to call

	in0 = address of UCP to resume after function returns

	in1 = global pointer for __start_context

	out0 .. outN = arguments for function  */

ENTRY(__start_context)

	.prologue

	alloc r2 = ar.pfs, 2, 0, 8, 0

	.save rp, r4		// terminate call chain with a NULL rp

	mov r4 = r0

	;;

	.body

	br.call.sptk rp = b1

1:

	mov gp = in1			// restore gp

	cmp.ne p6,p0 = in0, r0		// uc_link != 0 ?

	;;

(p6)	mov out0 = in0

(p6)	br.call.sptk rp = __setcontext

.Lexit:

	mov out0 = 0

	br.call.sptk rp = HIDDEN_JUMPTARGET(exit)

1:	br.cond.sptk .Lexit

END(__start_context)