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| Rev | Author | Line No. | Line |
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| 426 | jermar | 1 | # |
| 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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| 525 | jermar | 30 | #include <arch/stack.h> |
| 528 | jermar | 31 | |
| 32 | /** |
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| 33 | * Both context_save_arch() and context_restore_arch() are |
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| 529 | jermar | 34 | * leaf-optimized procedures. This kind of optimization |
| 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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| 528 | jermar | 38 | */ |
| 426 | jermar | 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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| 657 | jermar | 46 | stx %sp, [\r + OFFSET_SP] |
| 527 | jermar | 47 | stx %o7, [\r + OFFSET_PC] |
| 657 | jermar | 48 | stx %i0, [\r + OFFSET_I0] |
| 49 | stx %i1, [\r + OFFSET_I1] |
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| 50 | stx %i2, [\r + OFFSET_I2] |
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| 51 | stx %i3, [\r + OFFSET_I3] |
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| 52 | stx %i4, [\r + OFFSET_I4] |
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| 53 | stx %i5, [\r + OFFSET_I5] |
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| 528 | jermar | 54 | stx %fp, [\r + OFFSET_FP] |
| 650 | jermar | 55 | stx %i7, [\r + OFFSET_I7] |
| 657 | jermar | 56 | stx %l0, [\r + OFFSET_L0] |
| 57 | stx %l1, [\r + OFFSET_L1] |
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| 58 | stx %l2, [\r + OFFSET_L2] |
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| 59 | stx %l3, [\r + OFFSET_L3] |
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| 60 | stx %l4, [\r + OFFSET_L4] |
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| 61 | stx %l5, [\r + OFFSET_L5] |
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| 62 | stx %l6, [\r + OFFSET_L6] |
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| 63 | stx %l7, [\r + OFFSET_L7] |
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| 426 | jermar | 64 | .endm |
| 65 | |||
| 66 | .macro CONTEXT_LOAD r |
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| 657 | jermar | 67 | ldx [\r + OFFSET_SP], %sp |
| 527 | jermar | 68 | ldx [\r + OFFSET_PC], %o7 |
| 657 | jermar | 69 | ldx [\r + OFFSET_I0], %i0 |
| 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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| 528 | jermar | 75 | ldx [\r + OFFSET_FP], %fp |
| 650 | jermar | 76 | ldx [\r + OFFSET_I7], %i7 |
| 657 | jermar | 77 | ldx [\r + OFFSET_L0], %l0 |
| 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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| 426 | jermar | 85 | .endm |
| 86 | |||
| 87 | context_save_arch: |
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| 527 | jermar | 88 | CONTEXT_STORE %o0 |
| 89 | retl |
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| 528 | jermar | 90 | mov 1, %o0 ! context_save_arch returns 1 |
| 526 | jermar | 91 | |
| 426 | jermar | 92 | context_restore_arch: |
| 528 | jermar | 93 | # |
| 94 | # Flush all active windows. |
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| 95 | # This is essential, because CONTEXT_LOAD overwrites |
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| 96 | # %sp of CWP - 1 with the value written to %fp of CWP. |
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| 97 | # Flushing all active windows mitigates this problem |
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| 98 | # as CWP - 1 becomes the overlap window. |
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| 99 | # |
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| 100 | flushw |
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| 101 | |||
| 527 | jermar | 102 | CONTEXT_LOAD %o0 |
| 103 | retl |
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| 528 | jermar | 104 | xor %o0, %o0, %o0 ! context_restore_arch returns 0 |