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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.
#

#define __ASM__
#include <arch/asm/regname.h>
#include <arch/context_offset.h>
    
.text   

.set noat
.set noreorder
.set nomacro

.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_S7(\r)
    sw $gp,OFFSET_GP(\r)
    
    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_S7(\r)
    lw $gp,OFFSET_GP(\r)
    
    lw $ra,OFFSET_PC(\r)
    lw $sp,OFFSET_SP(\r)
.endm

    
context_save:
    CONTEXT_STORE $a0

    # context_save returns 1
    j $31
    li $2, 1    
    
context_restore:
    CONTEXT_LOAD $a0

    # context_restore returns 0
    j $31
    xor $2, $2