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| 1 | # |
1 | # |
| 2 | # Copyright (c) 2005 Jakub Jermar |
2 | # Copyright (c) 2005 Jakub Jermar |
| 3 | # All rights reserved. |
3 | # All rights reserved. |
| 4 | # |
4 | # |
| 5 | # Redistribution and use in source and binary forms, with or without |
5 | # Redistribution and use in source and binary forms, with or without |
| 6 | # modification, are permitted provided that the following conditions |
6 | # modification, are permitted provided that the following conditions |
| 7 | # are met: |
7 | # are met: |
| 8 | # |
8 | # |
| 9 | # - Redistributions of source code must retain the above copyright |
9 | # - Redistributions of source code must retain the above copyright |
| 10 | # notice, this list of conditions and the following disclaimer. |
10 | # notice, this list of conditions and the following disclaimer. |
| 11 | # - Redistributions in binary form must reproduce the above copyright |
11 | # - Redistributions in binary form must reproduce the above copyright |
| 12 | # notice, this list of conditions and the following disclaimer in the |
12 | # notice, this list of conditions and the following disclaimer in the |
| 13 | # documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | # derived from this software without specific prior written permission. |
| 16 | # |
16 | # |
| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | # |
27 | # |
| 28 | 28 | ||
| 29 | #include <arch/context_offset.h> |
29 | #include <arch/context_offset.h> |
| 30 | 30 | ||
| 31 | /** |
31 | /** |
| 32 | * Both context_save_arch() and context_restore_arch() are |
32 | * Both context_save_arch() and context_restore_arch() are |
| 33 | * leaf-optimized procedures. This kind of optimization |
33 | * leaf-optimized procedures. This kind of optimization |
| 34 | * is very important and prevents any implicit window |
34 | * is very important and prevents any implicit window |
| 35 | * spill/fill/clean traps in these very core kernel |
35 | * spill/fill/clean traps in these very core kernel |
| 36 | * functions. |
36 | * functions. |
| 37 | */ |
37 | */ |
| 38 | 38 | ||
| 39 | #include <arch/context_offset.h> |
39 | #include <arch/context_offset.h> |
| 40 | 40 | ||
| 41 | .text |
41 | .text |
| 42 | 42 | ||
| 43 | .global context_save_arch |
43 | .global context_save_arch |
| 44 | .global context_restore_arch |
44 | .global context_restore_arch |
| 45 | 45 | ||
| 46 | context_save_arch: |
46 | context_save_arch: |
| 47 | CONTEXT_SAVE_ARCH_CORE %o0 |
47 | CONTEXT_SAVE_ARCH_CORE %o0 |
| 48 | retl |
48 | retl |
| 49 | mov 1, %o0 ! context_save_arch returns 1 |
49 | mov 1, %o0 ! context_save_arch returns 1 |
| 50 | 50 | ||
| 51 | context_restore_arch: |
51 | context_restore_arch: |
| 52 | # |
52 | # |
| 53 | # Flush all active windows. |
53 | # Flush all active windows. |
| 54 | # This is essential, because CONTEXT_LOAD overwrites |
54 | # This is essential, because CONTEXT_LOAD overwrites |
| 55 | # %sp of CWP - 1 with the value written to %fp of CWP. |
55 | # %sp of CWP - 1 with the value written to %fp of CWP. |
| 56 | # Flushing all active windows mitigates this problem |
56 | # Flushing all active windows mitigates this problem |
| 57 | # as CWP - 1 becomes the overlap window. |
57 | # as CWP - 1 becomes the overlap window. |
| 58 | # |
58 | # |
| 59 | flushw |
59 | flushw |
| 60 | 60 | ||
| 61 | CONTEXT_RESTORE_ARCH_CORE %o0 |
61 | CONTEXT_RESTORE_ARCH_CORE %o0 |
| 62 | retl |
62 | retl |
| 63 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |
63 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |
| 64 | 64 | ||