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1 | # |
1 | # |
2 | # Copyright (C) 2006 Martin Decky |
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: |
Line 24... | Line 24... | ||
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 <libarch/context_offset.h> |
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- | 30 | ||
- | 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 | ||
29 | .text |
39 | .text |
30 | 40 | ||
31 | .global context_save |
41 | .global context_save |
32 | .global context_restore |
42 | .global context_restore |
33 | 43 | ||
- | 44 | .macro CONTEXT_STORE r |
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- | 45 | stx %sp, [\r + OFFSET_SP] |
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- | 46 | stx %o7, [\r + OFFSET_PC] |
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- | 47 | stx %i0, [\r + OFFSET_I0] |
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- | 48 | stx %i1, [\r + OFFSET_I1] |
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- | 49 | stx %i2, [\r + OFFSET_I2] |
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- | 50 | stx %i3, [\r + OFFSET_I3] |
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- | 51 | stx %i4, [\r + OFFSET_I4] |
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- | 52 | stx %i5, [\r + OFFSET_I5] |
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- | 53 | stx %fp, [\r + OFFSET_FP] |
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- | 54 | stx %i7, [\r + OFFSET_I7] |
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- | 55 | stx %l0, [\r + OFFSET_L0] |
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- | 56 | stx %l1, [\r + OFFSET_L1] |
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- | 57 | stx %l2, [\r + OFFSET_L2] |
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- | 58 | stx %l3, [\r + OFFSET_L3] |
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- | 59 | stx %l4, [\r + OFFSET_L4] |
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- | 60 | stx %l5, [\r + OFFSET_L5] |
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- | 61 | stx %l6, [\r + OFFSET_L6] |
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- | 62 | stx %l7, [\r + OFFSET_L7] |
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- | 63 | stx %g7, [\r + OFFSET_TP] |
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- | 64 | .endm |
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- | 65 | ||
- | 66 | .macro CONTEXT_LOAD r |
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- | 67 | ldx [\r + OFFSET_SP], %sp |
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- | 68 | ldx [\r + OFFSET_PC], %o7 |
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- | 69 | ldx [\r + OFFSET_I0], %i0 |
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- | 70 | ldx [\r + OFFSET_I1], %i1 |
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- | 71 | ldx [\r + OFFSET_I2], %i2 |
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- | 72 | ldx [\r + OFFSET_I3], %i3 |
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- | 73 | ldx [\r + OFFSET_I4], %i4 |
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- | 74 | ldx [\r + OFFSET_I5], %i5 |
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- | 75 | ldx [\r + OFFSET_FP], %fp |
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- | 76 | ldx [\r + OFFSET_I7], %i7 |
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- | 77 | ldx [\r + OFFSET_L0], %l0 |
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- | 78 | ldx [\r + OFFSET_L1], %l1 |
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- | 79 | ldx [\r + OFFSET_L2], %l2 |
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- | 80 | ldx [\r + OFFSET_L3], %l3 |
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- | 81 | ldx [\r + OFFSET_L4], %l4 |
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- | 82 | ldx [\r + OFFSET_L5], %l5 |
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- | 83 | ldx [\r + OFFSET_L6], %l6 |
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- | 84 | ldx [\r + OFFSET_L7], %l7 |
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34 | #include <libarch/context_offset.h> |
85 | ldx [\r + OFFSET_TP], %g7 |
- | 86 | .endm |
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35 | 87 | ||
36 | context_save: |
88 | context_save: |
- | 89 | CONTEXT_STORE %o0 |
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37 | 90 | retl |
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- | 91 | mov 1, %o0 ! context_save_arch returns 1 |
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38 | 92 | ||
39 | context_restore: |
93 | context_restore: |
- | 94 | # |
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- | 95 | # Flush all active windows. |
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- | 96 | # This is essential, because CONTEXT_LOAD overwrites |
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- | 97 | # %sp of CWP - 1 with the value written to %fp of CWP. |
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- | 98 | # Flushing all active windows mitigates this problem |
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- | 99 | # as CWP - 1 becomes the overlap window. |
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- | 100 | # |
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- | 101 | flushw |
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- | 102 | ||
- | 103 | CONTEXT_LOAD %o0 |
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- | 104 | retl |
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- | 105 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |