| [437ee6a4] | 1 | #
|
|---|
| [df4ed85] | 2 | # Copyright (c) 2005 Jakub Jermar
|
|---|
| [437ee6a4] | 3 | # All rights reserved.
|
|---|
| 4 | #
|
|---|
| 5 | # Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | # modification, are permitted provided that the following conditions
|
|---|
| 7 | # are met:
|
|---|
| 8 | #
|
|---|
| 9 | # - Redistributions of source code must retain the above copyright
|
|---|
| 10 | # notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | # - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | # notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | # documentation and/or other materials provided with the distribution.
|
|---|
| 14 | # - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | # derived from this software without specific prior written permission.
|
|---|
| 16 | #
|
|---|
| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | #
|
|---|
| 28 |
|
|---|
| 29 | #include <arch/context_offset.h>
|
|---|
| [414f59c] | 30 |
|
|---|
| 31 | /**
|
|---|
| 32 | * Both context_save_arch() and context_restore_arch() are
|
|---|
| [8ac5fe7] | 33 | * leaf-optimized procedures. This kind of optimization
|
|---|
| 34 | * is very important and prevents any implicit window
|
|---|
| 35 | * spill/fill/clean traps in these very core kernel
|
|---|
| 36 | * functions.
|
|---|
| [414f59c] | 37 | */
|
|---|
| [437ee6a4] | 38 |
|
|---|
| [ecc83bd] | 39 | #include <arch/context_offset.h>
|
|---|
| 40 |
|
|---|
| [437ee6a4] | 41 | .text
|
|---|
| 42 |
|
|---|
| 43 | .global context_save_arch
|
|---|
| 44 | .global context_restore_arch
|
|---|
| 45 |
|
|---|
| 46 | context_save_arch:
|
|---|
| [ecc83bd] | 47 | CONTEXT_SAVE_ARCH_CORE %o0
|
|---|
| [22e10ab] | 48 | retl
|
|---|
| [414f59c] | 49 | mov 1, %o0 ! context_save_arch returns 1
|
|---|
| [74813216] | 50 |
|
|---|
| [437ee6a4] | 51 | context_restore_arch:
|
|---|
| [414f59c] | 52 | #
|
|---|
| 53 | # Flush all active windows.
|
|---|
| 54 | # This is essential, because CONTEXT_LOAD overwrites
|
|---|
| 55 | # %sp of CWP - 1 with the value written to %fp of CWP.
|
|---|
| 56 | # Flushing all active windows mitigates this problem
|
|---|
| 57 | # as CWP - 1 becomes the overlap window.
|
|---|
| 58 | #
|
|---|
| 59 | flushw
|
|---|
| 60 |
|
|---|
| [ecc83bd] | 61 | CONTEXT_RESTORE_ARCH_CORE %o0
|
|---|
| [22e10ab] | 62 | retl
|
|---|
| [414f59c] | 63 | xor %o0, %o0, %o0 ! context_restore_arch returns 0
|
|---|
