| 1 | #
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| 2 | # Copyright (c) 2005 Jakub Jermar
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | #include <arch/context_offset.h>
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| 30 |
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| 31 | /**
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| 32 | * Both context_save_arch() and context_restore_arch() are
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| 33 | * leaf-optimized procedures. This kind of optimization
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| 34 | * is very important and prevents any implicit window
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| 35 | * spill/fill/clean traps in these very core kernel
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| 36 | * functions.
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| 37 | */
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| 38 |
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| 39 | #include <arch/context_offset.h>
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| 40 |
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| 41 | .text
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| 42 |
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| 43 | .global context_save_arch
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| 44 | .global context_restore_arch
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| 45 |
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| 46 | context_save_arch:
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| 47 | CONTEXT_SAVE_ARCH_CORE %o0
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| 48 | retl
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| 49 | mov 1, %o0 ! context_save_arch returns 1
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| 50 |
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| 51 | context_restore_arch:
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| 52 | #
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| 53 | # Flush all active windows.
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| 54 | # This is essential, because CONTEXT_LOAD overwrites
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| 55 | # %sp of CWP - 1 with the value written to %fp of CWP.
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| 56 | # Flushing all active windows mitigates this problem
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| 57 | # as CWP - 1 becomes the overlap window.
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| 58 | #
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| 59 | flushw
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| 60 |
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| 61 | CONTEXT_RESTORE_ARCH_CORE %o0
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| 62 | retl
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| 63 | xor %o0, %o0, %o0 ! context_restore_arch returns 0
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