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Rev | Author | Line No. | Line |
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426 | jermar | 1 | # |
2071 | jermar | 2 | # Copyright (c) 2005 Jakub Jermar |
426 | jermar | 3 | # All rights reserved. |
4 | # |
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5 | # Redistribution and use in source and binary forms, with or without |
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6 | # modification, are permitted provided that the following conditions |
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7 | # are met: |
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8 | # |
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9 | # - Redistributions of source code must retain the above copyright |
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10 | # notice, this list of conditions and the following disclaimer. |
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11 | # - Redistributions in binary form must reproduce the above copyright |
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12 | # notice, this list of conditions and the following disclaimer in the |
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13 | # documentation and/or other materials provided with the distribution. |
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14 | # - The name of the author may not be used to endorse or promote products |
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15 | # derived from this software without specific prior written permission. |
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16 | # |
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17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | # |
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28 | |||
29 | #include <arch/context_offset.h> |
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528 | jermar | 30 | |
31 | /** |
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32 | * Both context_save_arch() and context_restore_arch() are |
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529 | jermar | 33 | * leaf-optimized procedures. This kind of optimization |
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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528 | jermar | 37 | */ |
426 | jermar | 38 | |
39 | .text |
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40 | |||
41 | .global context_save_arch |
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42 | .global context_restore_arch |
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43 | |||
44 | .macro CONTEXT_STORE r |
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657 | jermar | 45 | stx %sp, [\r + OFFSET_SP] |
527 | jermar | 46 | stx %o7, [\r + OFFSET_PC] |
657 | jermar | 47 | stx %i0, [\r + OFFSET_I0] |
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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528 | jermar | 53 | stx %fp, [\r + OFFSET_FP] |
650 | jermar | 54 | stx %i7, [\r + OFFSET_I7] |
657 | jermar | 55 | stx %l0, [\r + OFFSET_L0] |
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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426 | jermar | 63 | .endm |
64 | |||
65 | .macro CONTEXT_LOAD r |
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657 | jermar | 66 | ldx [\r + OFFSET_SP], %sp |
527 | jermar | 67 | ldx [\r + OFFSET_PC], %o7 |
657 | jermar | 68 | ldx [\r + OFFSET_I0], %i0 |
69 | ldx [\r + OFFSET_I1], %i1 |
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70 | ldx [\r + OFFSET_I2], %i2 |
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71 | ldx [\r + OFFSET_I3], %i3 |
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72 | ldx [\r + OFFSET_I4], %i4 |
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73 | ldx [\r + OFFSET_I5], %i5 |
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528 | jermar | 74 | ldx [\r + OFFSET_FP], %fp |
650 | jermar | 75 | ldx [\r + OFFSET_I7], %i7 |
657 | jermar | 76 | ldx [\r + OFFSET_L0], %l0 |
77 | ldx [\r + OFFSET_L1], %l1 |
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78 | ldx [\r + OFFSET_L2], %l2 |
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79 | ldx [\r + OFFSET_L3], %l3 |
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80 | ldx [\r + OFFSET_L4], %l4 |
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81 | ldx [\r + OFFSET_L5], %l5 |
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82 | ldx [\r + OFFSET_L6], %l6 |
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83 | ldx [\r + OFFSET_L7], %l7 |
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426 | jermar | 84 | .endm |
85 | |||
86 | context_save_arch: |
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527 | jermar | 87 | CONTEXT_STORE %o0 |
88 | retl |
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528 | jermar | 89 | mov 1, %o0 ! context_save_arch returns 1 |
526 | jermar | 90 | |
426 | jermar | 91 | context_restore_arch: |
528 | jermar | 92 | # |
93 | # Flush all active windows. |
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94 | # This is essential, because CONTEXT_LOAD overwrites |
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95 | # %sp of CWP - 1 with the value written to %fp of CWP. |
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96 | # Flushing all active windows mitigates this problem |
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97 | # as CWP - 1 becomes the overlap window. |
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98 | # |
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99 | flushw |
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100 | |||
527 | jermar | 101 | CONTEXT_LOAD %o0 |
102 | retl |
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528 | jermar | 103 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |