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#
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#
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# Copyright (C) 2005 Jakub Jermar
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# Copyright (C) 2005 Jakub Jermar
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# All rights reserved.
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# All rights reserved.
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#
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#
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# Redistribution and use in source and binary forms, with or without
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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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# modification, are permitted provided that the following conditions
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# are met:
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# are met:
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#
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#
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# - Redistributions of source code must retain the above copyright
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# - 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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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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# - 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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#   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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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#   derived from this software without specific prior written permission.
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#
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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#include <arch/context_offset.h>
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#include <arch/context_offset.h>
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#include <arch/stack.h>
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#include <arch/stack.h>
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/**
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/**
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 * Both context_save_arch() and context_restore_arch() are
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 * Both context_save_arch() and context_restore_arch() are
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 * leaf-optimized procedures. This kind of optimization
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 * leaf-optimized procedures. This kind of optimization
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 * is very important and prevents any implicit window
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 * is very important and prevents any implicit window
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 * spill/fill/clean traps in these very core kernel
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 * spill/fill/clean traps in these very core kernel
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 * functions.
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 * functions.
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 */
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 */
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.text
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.text
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.global context_save_arch
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.global context_save_arch
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.global context_restore_arch
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.global context_restore_arch
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.macro CONTEXT_STORE r
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.macro CONTEXT_STORE r
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	stx %o1, [\r + OFFSET_O1]
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	stx %o2, [\r + OFFSET_O2]
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	stx %o3, [\r + OFFSET_O3]
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	stx %o4, [\r + OFFSET_O4]
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	stx %o5, [\r + OFFSET_O5]
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	stx %o7, [\r + OFFSET_PC]
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	stx %sp, [\r + OFFSET_SP]
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	stx %sp, [\r + OFFSET_SP]
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	stx %o7, [\r + OFFSET_PC]
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	stx %i0, [\r + OFFSET_I0]
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	stx %i1, [\r + OFFSET_I1]
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	stx %i2, [\r + OFFSET_I2]
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	stx %i3, [\r + OFFSET_I3]
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	stx %i4, [\r + OFFSET_I4]
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	stx %i5, [\r + OFFSET_I5]
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	stx %fp, [\r + OFFSET_FP]
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	stx %fp, [\r + OFFSET_FP]
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	stx %i7, [\r + OFFSET_I7]
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	stx %i7, [\r + OFFSET_I7]
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	stx %l0, [\r + OFFSET_L0]
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	stx %l1, [\r + OFFSET_L1]
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	stx %l2, [\r + OFFSET_L2]
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	stx %l3, [\r + OFFSET_L3]
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	stx %l4, [\r + OFFSET_L4]
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	stx %l5, [\r + OFFSET_L5]
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	stx %l6, [\r + OFFSET_L6]
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	stx %l7, [\r + OFFSET_L7]
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.endm
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.endm
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.macro CONTEXT_LOAD r
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.macro CONTEXT_LOAD r
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	ldx [\r + OFFSET_O1], %o1
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	ldx [\r + OFFSET_O2], %o2
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	ldx [\r + OFFSET_O3], %o3
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	ldx [\r + OFFSET_O4], %o4
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	ldx [\r + OFFSET_O5], %o5
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	ldx [\r + OFFSET_PC], %o7
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	ldx [\r + OFFSET_SP], %sp
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	ldx [\r + OFFSET_SP], %sp
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	ldx [\r + OFFSET_PC], %o7
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	ldx [\r + OFFSET_I0], %i0
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	ldx [\r + OFFSET_I1], %i1
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	ldx [\r + OFFSET_I2], %i2
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	ldx [\r + OFFSET_I3], %i3
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	ldx [\r + OFFSET_I4], %i4
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	ldx [\r + OFFSET_I5], %i5
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	ldx [\r + OFFSET_FP], %fp
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	ldx [\r + OFFSET_FP], %fp
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	ldx [\r + OFFSET_I7], %i7
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	ldx [\r + OFFSET_I7], %i7
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	ldx [\r + OFFSET_L0], %l0
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	ldx [\r + OFFSET_L1], %l1
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	ldx [\r + OFFSET_L2], %l2
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	ldx [\r + OFFSET_L3], %l3
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	ldx [\r + OFFSET_L4], %l4
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	ldx [\r + OFFSET_L5], %l5
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	ldx [\r + OFFSET_L6], %l6
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	ldx [\r + OFFSET_L7], %l7
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.endm
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.endm
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context_save_arch:
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context_save_arch:
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	CONTEXT_STORE %o0
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	CONTEXT_STORE %o0
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	retl
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	retl
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	mov 1, %o0		! context_save_arch returns 1
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	mov 1, %o0		! context_save_arch returns 1
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context_restore_arch:
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context_restore_arch:
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	#
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	#
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	# Flush all active windows.
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	# Flush all active windows.
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	# This is essential, because CONTEXT_LOAD overwrites
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	# This is essential, because CONTEXT_LOAD overwrites
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	# %sp of CWP - 1 with the value written to %fp of CWP.
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	# %sp of CWP - 1 with the value written to %fp of CWP.
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	# Flushing all active windows mitigates this problem
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	# Flushing all active windows mitigates this problem
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	# as CWP - 1 becomes the overlap window.
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	# as CWP - 1 becomes the overlap window.
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	#
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	#
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	flushw
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	flushw
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	CONTEXT_LOAD %o0
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	CONTEXT_LOAD %o0
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	retl
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	retl
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	xor %o0, %o0, %o0	! context_restore_arch returns 0
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	xor %o0, %o0, %o0	! context_restore_arch returns 0
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