2013-12-06 12:04:52 +01:00
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/* $NetBSD: swapcontext.S,v 1.7 2013/09/12 15:36:15 joerg Exp $ */
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2011-02-14 20:36:03 +01:00
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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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2013-12-06 12:04:52 +01:00
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__RCSID("$NetBSD: swapcontext.S,v 1.7 2013/09/12 15:36:15 joerg Exp $")
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2011-02-14 20:36:03 +01:00
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#define XCALLFRAMELEN (((2+3)*SZREG + CALLFRAMELEN - 1) & -CALLFRAMELEN)
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#define XCALLFRAME_R30 (XCALLFRAMELEN-1*SZREG)
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#define XCALLFRAME_UCP (XCALLFRAMELEN-2*SZREG)
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#define XCALLFRAME_OUCP (XCALLFRAMELEN-3*SZREG)
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ENTRY(swapcontext)
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stwu %r1,-XCALLFRAMELEN(%r1) # set up new stack frame
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mflr %r0
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stw %r0,XCALLFRAMELEN+CALLFRAME_LR(%r1) # save link register
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stw %r3,XCALLFRAME_OUCP(%r1) # must save oucp
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stw %r4,XCALLFRAME_UCP(%r1) # must save ucp
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2013-12-06 12:04:52 +01:00
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#ifdef __PIC__
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2011-02-14 20:36:03 +01:00
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stw %r30,XCALLFRAME_R30(%r1) # must save r30
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PIC_TOCSETUP(swapcontext,%r30) # setup toc pointer
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#endif
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bl PIC_PLT(_C_LABEL(_getcontext)) # getcontext(oucp)
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cmpwi %r3,0
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bne 1f
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lwz %r11,XCALLFRAME_OUCP(%r1) # load oucp for adjustment
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lwz %r0,XCALLFRAMELEN+CALLFRAME_LR(%r1)
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stw %r0,UC_GREGS_PC(%r11) # pc <- lr
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addi %r0,%r1,XCALLFRAMELEN
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stw %r0,UC_GREGS_R1(%r11) # adjust sp
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lwz %r3,XCALLFRAME_UCP(%r1) # load ucp
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bl PIC_PLT(_C_LABEL(setcontext)) # setcontext(ucp)
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1:
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lwz %r0,XCALLFRAMELEN+CALLFRAME_LR(%r1)
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2013-12-06 12:04:52 +01:00
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#ifdef __PIC__
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2011-02-14 20:36:03 +01:00
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lwz %r30,XCALLFRAME_R30(%r1)
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#endif
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mtlr %r0
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addi %r1,%r1,XCALLFRAMELEN
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blr
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END(swapcontext)
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