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#

# Copyright (c) 2005 Martin Decky

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

#

# - Redistributions of source code must retain the above copyright

#   notice, this list of conditions and the following disclaimer.

# - 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.

# - The name of the author may not be used to endorse or promote products

#   derived from this software without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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

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# (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 <arch/asm/regname.h>

#include <arch/context_offset.h>

.text   

.global context_save_arch

.global context_restore_arch

.macro CONTEXT_STORE r

	stw sp, OFFSET_SP(\r)

	stw r2, OFFSET_R2(\r)

	stw r13, OFFSET_R13(\r)

	stw r14, OFFSET_R14(\r)

	stw r15, OFFSET_R15(\r)

	stw r16, OFFSET_R16(\r)

	stw r17, OFFSET_R17(\r)

	stw r18, OFFSET_R18(\r)

	stw r19, OFFSET_R19(\r)

	stw r20, OFFSET_R20(\r)

	stw r21, OFFSET_R21(\r)

	stw r22, OFFSET_R22(\r)

	stw r23, OFFSET_R23(\r)

	stw r24, OFFSET_R24(\r)

	stw r25, OFFSET_R25(\r)

	stw r26, OFFSET_R26(\r)

	stw r27, OFFSET_R27(\r)

	stw r28, OFFSET_R28(\r)

	stw r29, OFFSET_R29(\r)

	stw r30, OFFSET_R30(\r)

	stw r31, OFFSET_R31(\r)

.endm

.macro CONTEXT_LOAD r

	lwz sp, OFFSET_SP(\r)

	lwz r2, OFFSET_R2(\r)

	lwz r13, OFFSET_R13(\r)

	lwz r14, OFFSET_R14(\r)

	lwz r15, OFFSET_R15(\r)

	lwz r16, OFFSET_R16(\r)

	lwz r17, OFFSET_R17(\r)

	lwz r18, OFFSET_R18(\r)

	lwz r19, OFFSET_R19(\r)

	lwz r20, OFFSET_R20(\r)

	lwz r21, OFFSET_R21(\r)

	lwz r22, OFFSET_R22(\r)

	lwz r23, OFFSET_R23(\r)

	lwz r24, OFFSET_R24(\r)

	lwz r25, OFFSET_R25(\r)

	lwz r26, OFFSET_R26(\r)

	lwz r27, OFFSET_R27(\r)

	lwz r28, OFFSET_R28(\r)

	lwz r29, OFFSET_R29(\r)

	lwz r30, OFFSET_R30(\r)

	lwz r31, OFFSET_R31(\r)

.endm

context_save_arch:

	CONTEXT_STORE r3

	mflr r4

	stw r4, OFFSET_PC(r3)

	mfcr r4

	stw r4, OFFSET_CR(r3)

	# context_save returns 1

	li r3, 1

	blr

context_restore_arch:

	CONTEXT_LOAD r3

	lwz r4, OFFSET_CR(r3)

	mtcr r4

	lwz r4, OFFSET_PC(r3)

	mtlr r4

	# context_restore returns 0

	li r3, 0

	blr