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/* $NetBSD: _resumecontext.S,v 1.7 2012/09/12 02:00:52 manu Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Wayne Knowles.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
#include "SYS.h"
#include "assym.h"
#if defined(SYSLIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: _resumecontext.S,v 1.7 2012/09/12 02:00:52 manu Exp $")
#endif /* SYSLIBC_SCCS && !lint */
.set reorder
.hidden _C_LABEL(__resumecontext)
LEAF_NOPROFILE(__resumecontext)
/*
* We get here not by a call through $t9 but thru $ra after the
* function passed to makecontext returns.
*/
PTR_SUBU sp, sp, UCONTEXT_SIZE # get space for ucontext
move a0, sp # arg0 for getcontext
PTR_S zero, _OFFSETOF_UC_LINK(a0) # make sure uc_link is 0
SYSTRAP(getcontext) # get context
PTR_L a0, _OFFSETOF_UC_LINK(a0) # linked context?
beq a0, zero, 1f # nope, exit process
nop
PIC_TAILCALL(setcontext) # yes, become it.
/* NOTREACHED (in theory) */
li a0, -1 # failure,
1:
SYSTRAP(exit) # all hope is lost.
/* NOTREACHED */
END(__resumecontext)
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