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#
# Copyright (c) 2006 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
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# - Redistributions in binary form must reproduce the above copyright
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#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.text

.global context_save
.global context_restore

#include <libarch/regname.h>
#include <arch/context_offset.h>

context_save:
    CONTEXT_SAVE_ARCH_CORE 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:
    CONTEXT_RESTORE_ARCH_CORE r3
    
    lwz r4, OFFSET_CR(r3)
    mtcr r4
    
    lwz r4, OFFSET_PC(r3)
    mtlr r4
    
    # context_restore returns 0
    li r3, 0
    blr