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- | 1 | # |
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- | 2 | # Copyright (C) 2005 Jakub Jermar |
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- | 3 | # All rights reserved. |
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- | 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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- | 30 | #include <arch/stack.h> |
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- | 31 | ||
- | 32 | /** |
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- | 33 | * Both context_save_arch() and context_restore_arch() are |
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- | 34 | * leaf-optimized procedures. This kind of optimization |
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- | 35 | * is very important and prevents any implicit window |
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- | 36 | * spill/fill/clean traps in these very core kernel |
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- | 37 | * functions. |
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- | 38 | */ |
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- | 39 | ||
- | 40 | .text |
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- | 41 | ||
- | 42 | .global context_save_arch |
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- | 43 | .global context_restore_arch |
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- | 44 | ||
- | 45 | .macro CONTEXT_STORE r |
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- | 46 | stx %o1, [\r + OFFSET_O1] |
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- | 47 | stx %o2, [\r + OFFSET_O2] |
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- | 48 | stx %o3, [\r + OFFSET_O3] |
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- | 49 | stx %o4, [\r + OFFSET_O4] |
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- | 50 | stx %o5, [\r + OFFSET_O5] |
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- | 51 | stx %o7, [\r + OFFSET_PC] |
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- | 52 | stx %sp, [\r + OFFSET_SP] |
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- | 53 | stx %fp, [\r + OFFSET_FP] |
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- | 54 | .endm |
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- | 55 | ||
- | 56 | .macro CONTEXT_LOAD r |
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- | 57 | ldx [\r + OFFSET_O1], %o1 |
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- | 58 | ldx [\r + OFFSET_O2], %o2 |
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- | 59 | ldx [\r + OFFSET_O3], %o3 |
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- | 60 | ldx [\r + OFFSET_O4], %o4 |
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- | 61 | ldx [\r + OFFSET_O5], %o5 |
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- | 62 | ldx [\r + OFFSET_PC], %o7 |
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- | 63 | ldx [\r + OFFSET_SP], %sp |
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- | 64 | ldx [\r + OFFSET_FP], %fp |
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- | 65 | .endm |
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- | 66 | ||
- | 67 | context_save_arch: |
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- | 68 | CONTEXT_STORE %o0 |
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- | 69 | retl |
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- | 70 | mov 1, %o0 ! context_save_arch returns 1 |
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- | 71 | ||
- | 72 | context_restore_arch: |
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- | 73 | # |
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- | 74 | # Flush all active windows. |
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- | 75 | # This is essential, because CONTEXT_LOAD overwrites |
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- | 76 | # %sp of CWP - 1 with the value written to %fp of CWP. |
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- | 77 | # Flushing all active windows mitigates this problem |
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- | 78 | # as CWP - 1 becomes the overlap window. |
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- | 79 | # |
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- | 80 | flushw |
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- | 81 | ||
- | 82 | CONTEXT_LOAD %o0 |
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- | 83 | retl |
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- | 84 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |