68 lines
2.4 KiB
ArmAsm
68 lines
2.4 KiB
ArmAsm
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/* $NetBSD: swapcontext.S,v 1.4 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 Klaus Klein.
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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 "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: swapcontext.S,v 1.4 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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NESTED(swapcontext, CALLFRAME_SIZ, ra)
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.mask 0x80000030, (CALLFRAME_RA - CALLFRAME_SIZ)
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PTR_SUBU sp, sp, CALLFRAME_SIZ
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PTR_S ra, CALLFRAME_RA(sp) # save ra
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PTR_S a0, 0(sp) # stash away oucp
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PTR_S a1, SZREG(sp) # stash away ucp
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SYSTRAP(getcontext)
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PTR_L ra, CALLFRAME_RA(sp)
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bne a3, zero, 1f
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PTR_L v1, 0(sp) # load oucp again for adjustment
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PTR_L a0, SZREG(sp) # load ucp
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PTR_ADDIU v0, sp, CALLFRAME_SIZ
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REG_PROLOGUE
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REG_S zero, _OFFSETOF_UC_GREGS_V0(v1)
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REG_S ra, _OFFSETOF_UC_GREGS_EPC(v1)
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REG_S v0, _OFFSETOF_UC_GREGS_SP(v1)
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REG_EPILOGUE
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SYSTRAP(setcontext)
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/* NOTREACHED */
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1:
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PTR_ADDU sp, sp, CALLFRAME_SIZ
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SETUP_GPX(t0);
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SETUP_GP64(t3,swapcontext);
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PIC_TAILCALL(__cerror)
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END(swapcontext)
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