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#

# Copyright (c) 2003-2004 Jakub Jermar

# 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

# 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.

#

.text

.set noat

.set noreorder

#include <arch/asm/regname.h>

#include <libarch/context_offset.h>

.global context_save

.global context_restore

.macro CONTEXT_STORE r

	sw $s0,OFFSET_S0(\r)

	sw $s1,OFFSET_S1(\r)

	sw $s2,OFFSET_S2(\r)

	sw $s3,OFFSET_S3(\r)

	sw $s4,OFFSET_S4(\r)

	sw $s5,OFFSET_S5(\r)

	sw $s6,OFFSET_S6(\r)

	sw $s7,OFFSET_S7(\r)

	sw $s8,OFFSET_S8(\r)

	sw $gp,OFFSET_GP(\r)

	sw $k1,OFFSET_TLS(\r)

#ifdef CONFIG_MIPS_FPU	

	mfc1 $t0,$20

	sw $t0, OFFSET_F20(\r)

	mfc1 $t0,$21

	sw $t0, OFFSET_F21(\r)

	mfc1 $t0,$22

	sw $t0, OFFSET_F22(\r)

	mfc1 $t0,$23

	sw $t0, OFFSET_F23(\r)

	mfc1 $t0,$24

	sw $t0, OFFSET_F24(\r)

	mfc1 $t0,$25

	sw $t0, OFFSET_F25(\r)

	mfc1 $t0,$26

	sw $t0, OFFSET_F26(\r)

	mfc1 $t0,$27

	sw $t0, OFFSET_F27(\r)

	mfc1 $t0,$28

	sw $t0, OFFSET_F28(\r)

	mfc1 $t0,$29

	sw $t0, OFFSET_F29(\r)

	mfc1 $t0,$30

	sw $t0, OFFSET_F30(\r)

#endif	

	sw $ra,OFFSET_PC(\r)

	sw $sp,OFFSET_SP(\r)

.endm

.macro CONTEXT_LOAD r

	lw $s0,OFFSET_S0(\r)

	lw $s1,OFFSET_S1(\r)

	lw $s2,OFFSET_S2(\r)

	lw $s3,OFFSET_S3(\r)

	lw $s4,OFFSET_S4(\r)

	lw $s5,OFFSET_S5(\r)

	lw $s6,OFFSET_S6(\r)

	lw $s7,OFFSET_S7(\r)

	lw $s8,OFFSET_S8(\r)

	lw $gp,OFFSET_GP(\r)

	lw $k1,OFFSET_TLS(\r)

#ifdef CONFIG_MIPS_FPU	

	lw $t0, OFFSET_F20(\r)

	mtc1 $t0,$20

	lw $t0, OFFSET_F21(\r)

	mtc1 $t0,$21

	lw $t0, OFFSET_F22(\r)

	mtc1 $t0,$22

	lw $t0, OFFSET_F23(\r)

	mtc1 $t0,$23

	lw $t0, OFFSET_F24(\r)

	mtc1 $t0,$24

	lw $t0, OFFSET_F25(\r)

	mtc1 $t0,$25

	lw $t0, OFFSET_F26(\r)

	mtc1 $t0,$26

	lw $t0, OFFSET_F27(\r)

	mtc1 $t0,$27

	lw $t0, OFFSET_F28(\r)

	mtc1 $t0,$28

	lw $t0, OFFSET_F29(\r)

	mtc1 $t0,$29

	lw $t0, OFFSET_F30(\r)

	mtc1 $t0,$30

#endif	

	lw $ra,OFFSET_PC(\r)

	lw $sp,OFFSET_SP(\r)

.endm

context_save:

	CONTEXT_STORE $a0

	# context_save returns 1

	j $ra

	li $v0, 1	

context_restore:

	CONTEXT_LOAD $a0

	# Just for the jump into first function, but one instruction

	# should not bother us

	move $t9, $ra	

	# context_restore returns 0

	j $ra

	xor $v0, $v0