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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 | .text |
39 | .text |
40 | 40 | ||
41 | .global context_save_arch |
41 | .global context_save_arch |
42 | .global context_restore_arch |
42 | .global context_restore_arch |
43 | 43 | ||
44 | .macro CONTEXT_STORE r |
44 | .macro CONTEXT_STORE r |
45 | stx %sp, [\r + OFFSET_SP] |
45 | stx %sp, [\r + OFFSET_SP] |
46 | stx %o7, [\r + OFFSET_PC] |
46 | stx %o7, [\r + OFFSET_PC] |
47 | stx %i0, [\r + OFFSET_I0] |
47 | stx %i0, [\r + OFFSET_I0] |
48 | stx %i1, [\r + OFFSET_I1] |
48 | stx %i1, [\r + OFFSET_I1] |
49 | stx %i2, [\r + OFFSET_I2] |
49 | stx %i2, [\r + OFFSET_I2] |
50 | stx %i3, [\r + OFFSET_I3] |
50 | stx %i3, [\r + OFFSET_I3] |
51 | stx %i4, [\r + OFFSET_I4] |
51 | stx %i4, [\r + OFFSET_I4] |
52 | stx %i5, [\r + OFFSET_I5] |
52 | stx %i5, [\r + OFFSET_I5] |
53 | stx %fp, [\r + OFFSET_FP] |
53 | stx %fp, [\r + OFFSET_FP] |
54 | stx %i7, [\r + OFFSET_I7] |
54 | stx %i7, [\r + OFFSET_I7] |
55 | stx %l0, [\r + OFFSET_L0] |
55 | stx %l0, [\r + OFFSET_L0] |
56 | stx %l1, [\r + OFFSET_L1] |
56 | stx %l1, [\r + OFFSET_L1] |
57 | stx %l2, [\r + OFFSET_L2] |
57 | stx %l2, [\r + OFFSET_L2] |
58 | stx %l3, [\r + OFFSET_L3] |
58 | stx %l3, [\r + OFFSET_L3] |
59 | stx %l4, [\r + OFFSET_L4] |
59 | stx %l4, [\r + OFFSET_L4] |
60 | stx %l5, [\r + OFFSET_L5] |
60 | stx %l5, [\r + OFFSET_L5] |
61 | stx %l6, [\r + OFFSET_L6] |
61 | stx %l6, [\r + OFFSET_L6] |
62 | stx %l7, [\r + OFFSET_L7] |
62 | stx %l7, [\r + OFFSET_L7] |
63 | .endm |
63 | .endm |
64 | 64 | ||
65 | .macro CONTEXT_LOAD r |
65 | .macro CONTEXT_LOAD r |
66 | ldx [\r + OFFSET_SP], %sp |
66 | ldx [\r + OFFSET_SP], %sp |
67 | ldx [\r + OFFSET_PC], %o7 |
67 | ldx [\r + OFFSET_PC], %o7 |
68 | ldx [\r + OFFSET_I0], %i0 |
68 | ldx [\r + OFFSET_I0], %i0 |
69 | ldx [\r + OFFSET_I1], %i1 |
69 | ldx [\r + OFFSET_I1], %i1 |
70 | ldx [\r + OFFSET_I2], %i2 |
70 | ldx [\r + OFFSET_I2], %i2 |
71 | ldx [\r + OFFSET_I3], %i3 |
71 | ldx [\r + OFFSET_I3], %i3 |
72 | ldx [\r + OFFSET_I4], %i4 |
72 | ldx [\r + OFFSET_I4], %i4 |
73 | ldx [\r + OFFSET_I5], %i5 |
73 | ldx [\r + OFFSET_I5], %i5 |
74 | ldx [\r + OFFSET_FP], %fp |
74 | ldx [\r + OFFSET_FP], %fp |
75 | ldx [\r + OFFSET_I7], %i7 |
75 | ldx [\r + OFFSET_I7], %i7 |
76 | ldx [\r + OFFSET_L0], %l0 |
76 | ldx [\r + OFFSET_L0], %l0 |
77 | ldx [\r + OFFSET_L1], %l1 |
77 | ldx [\r + OFFSET_L1], %l1 |
78 | ldx [\r + OFFSET_L2], %l2 |
78 | ldx [\r + OFFSET_L2], %l2 |
79 | ldx [\r + OFFSET_L3], %l3 |
79 | ldx [\r + OFFSET_L3], %l3 |
80 | ldx [\r + OFFSET_L4], %l4 |
80 | ldx [\r + OFFSET_L4], %l4 |
81 | ldx [\r + OFFSET_L5], %l5 |
81 | ldx [\r + OFFSET_L5], %l5 |
82 | ldx [\r + OFFSET_L6], %l6 |
82 | ldx [\r + OFFSET_L6], %l6 |
83 | ldx [\r + OFFSET_L7], %l7 |
83 | ldx [\r + OFFSET_L7], %l7 |
84 | .endm |
84 | .endm |
85 | 85 | ||
86 | context_save_arch: |
86 | context_save_arch: |
87 | CONTEXT_STORE %o0 |
87 | CONTEXT_STORE %o0 |
88 | retl |
88 | retl |
89 | mov 1, %o0 ! context_save_arch returns 1 |
89 | mov 1, %o0 ! context_save_arch returns 1 |
90 | 90 | ||
91 | context_restore_arch: |
91 | context_restore_arch: |
92 | # |
92 | # |
93 | # Flush all active windows. |
93 | # Flush all active windows. |
94 | # This is essential, because CONTEXT_LOAD overwrites |
94 | # This is essential, because CONTEXT_LOAD overwrites |
95 | # %sp of CWP - 1 with the value written to %fp of CWP. |
95 | # %sp of CWP - 1 with the value written to %fp of CWP. |
96 | # Flushing all active windows mitigates this problem |
96 | # Flushing all active windows mitigates this problem |
97 | # as CWP - 1 becomes the overlap window. |
97 | # as CWP - 1 becomes the overlap window. |
98 | # |
98 | # |
99 | flushw |
99 | flushw |
100 | 100 | ||
101 | CONTEXT_LOAD %o0 |
101 | CONTEXT_LOAD %o0 |
102 | retl |
102 | retl |
103 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |
103 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |
104 | 104 |