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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 | #include <arch/stack.h> |
30 | #include <arch/stack.h> |
31 | 31 | ||
32 | /** |
32 | /** |
33 | * Both context_save_arch() and context_restore_arch() are |
33 | * Both context_save_arch() and context_restore_arch() are |
34 | * leaf-optimized procedures. Both of them touch %sp and |
34 | * leaf-optimized procedures. This kind of optimization |
35 | * %fp and thus break SCD 2.4 compliance. However, these |
- | |
36 | * functions are special enough to be allowed this |
- | |
37 | * kind of behavior. Moreover, this kind of optimization |
- | |
38 | * is very important and prevents any window spill/ |
35 | * is very important and prevents any implicit window |
39 | * fill/clean traps in these very core kernel functions. |
36 | * spill/fill/clean traps in these very core kernel |
- | 37 | * functions. |
|
40 | */ |
38 | */ |
41 | 39 | ||
42 | .text |
40 | .text |
43 | 41 | ||
44 | .global context_save_arch |
42 | .global context_save_arch |
45 | .global context_restore_arch |
43 | .global context_restore_arch |
46 | 44 | ||
47 | .macro CONTEXT_STORE r |
45 | .macro CONTEXT_STORE r |
48 | stx %o1, [\r + OFFSET_O1] |
46 | stx %o1, [\r + OFFSET_O1] |
49 | stx %o2, [\r + OFFSET_O2] |
47 | stx %o2, [\r + OFFSET_O2] |
50 | stx %o3, [\r + OFFSET_O3] |
48 | stx %o3, [\r + OFFSET_O3] |
51 | stx %o4, [\r + OFFSET_O4] |
49 | stx %o4, [\r + OFFSET_O4] |
52 | stx %o5, [\r + OFFSET_O5] |
50 | stx %o5, [\r + OFFSET_O5] |
53 | stx %o7, [\r + OFFSET_PC] |
51 | stx %o7, [\r + OFFSET_PC] |
54 | stx %sp, [\r + OFFSET_SP] |
52 | stx %sp, [\r + OFFSET_SP] |
55 | stx %fp, [\r + OFFSET_FP] |
53 | stx %fp, [\r + OFFSET_FP] |
56 | .endm |
54 | .endm |
57 | 55 | ||
58 | .macro CONTEXT_LOAD r |
56 | .macro CONTEXT_LOAD r |
59 | ldx [\r + OFFSET_O1], %o1 |
57 | ldx [\r + OFFSET_O1], %o1 |
60 | ldx [\r + OFFSET_O2], %o2 |
58 | ldx [\r + OFFSET_O2], %o2 |
61 | ldx [\r + OFFSET_O3], %o3 |
59 | ldx [\r + OFFSET_O3], %o3 |
62 | ldx [\r + OFFSET_O4], %o4 |
60 | ldx [\r + OFFSET_O4], %o4 |
63 | ldx [\r + OFFSET_O5], %o5 |
61 | ldx [\r + OFFSET_O5], %o5 |
64 | ldx [\r + OFFSET_PC], %o7 |
62 | ldx [\r + OFFSET_PC], %o7 |
65 | ldx [\r + OFFSET_SP], %sp |
63 | ldx [\r + OFFSET_SP], %sp |
66 | ldx [\r + OFFSET_FP], %fp |
64 | ldx [\r + OFFSET_FP], %fp |
67 | .endm |
65 | .endm |
68 | 66 | ||
69 | context_save_arch: |
67 | context_save_arch: |
70 | CONTEXT_STORE %o0 |
68 | CONTEXT_STORE %o0 |
71 | retl |
69 | retl |
72 | mov 1, %o0 ! context_save_arch returns 1 |
70 | mov 1, %o0 ! context_save_arch returns 1 |
73 | 71 | ||
74 | context_restore_arch: |
72 | context_restore_arch: |
75 | # |
73 | # |
76 | # Flush all active windows. |
74 | # Flush all active windows. |
77 | # This is essential, because CONTEXT_LOAD overwrites |
75 | # This is essential, because CONTEXT_LOAD overwrites |
78 | # %sp of CWP - 1 with the value written to %fp of CWP. |
76 | # %sp of CWP - 1 with the value written to %fp of CWP. |
79 | # Flushing all active windows mitigates this problem |
77 | # Flushing all active windows mitigates this problem |
80 | # as CWP - 1 becomes the overlap window. |
78 | # as CWP - 1 becomes the overlap window. |
81 | # |
79 | # |
82 | flushw |
80 | flushw |
83 | 81 | ||
84 | CONTEXT_LOAD %o0 |
82 | CONTEXT_LOAD %o0 |
85 | retl |
83 | retl |
86 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |
84 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |
87 | 85 |