63 lines
2.4 KiB
ArmAsm
63 lines
2.4 KiB
ArmAsm
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/* $NetBSD: _resumecontext.S,v 1.6 2009/12/14 01:07:42 matt Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Wayne Knowles.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#include "SYS.h"
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#include "assym.h"
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#if defined(SYSLIBC_SCCS) && !defined(lint)
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RCSID("$NetBSD: _resumecontext.S,v 1.6 2009/12/14 01:07:42 matt Exp $")
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#endif /* SYSLIBC_SCCS && !lint */
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.set reorder
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.hidden _C_LABEL(__resumecontext)
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LEAF_NOPROFILE(__resumecontext)
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/*
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* We get here not by a call through $t9 but thru $ra after the
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* function passed to makecontext returns.
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*/
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PTR_SUBU sp, sp, UCONTEXT_SIZE # get space for ucontext
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move a0, sp # arg0 for getcontext
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PTR_S zero, _OFFSETOF_UC_LINK(a0) # make sure uc_link is 0
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SYSTRAP(getcontext) # get context
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PTR_L a0, _OFFSETOF_UC_LINK(a0) # linked context?
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beq a0, zero, 1f # nope, exit process
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nop
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SYSTRAP(setcontext) # yes, become it.
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/* NOTREACHED (in theory) */
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li a0, -1 # failure,
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1:
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SYSTRAP(exit) # all hope is lost.
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/* NOTREACHED */
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END(__resumecontext)
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