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| Rev | Author | Line No. | Line |
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| 1217 | decky | 1 | # |
| 2071 | jermar | 2 | # Copyright (c) 2006 Martin Decky |
| 1217 | decky | 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 | .text |
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| 30 | |||
| 31 | .global context_save |
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| 32 | .global context_restore |
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| 33 | |||
| 1286 | decky | 34 | #include <libarch/regname.h> |
| 1217 | decky | 35 | #include <libarch/context_offset.h> |
| 36 | |||
| 1286 | decky | 37 | .macro CONTEXT_STORE r |
| 38 | stw sp, OFFSET_SP(\r) |
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| 39 | stw r2, OFFSET_R2(\r) |
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| 40 | stw r13, OFFSET_R13(\r) |
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| 41 | stw r14, OFFSET_R14(\r) |
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| 42 | stw r15, OFFSET_R15(\r) |
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| 43 | stw r16, OFFSET_R16(\r) |
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| 44 | stw r17, OFFSET_R17(\r) |
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| 45 | stw r18, OFFSET_R18(\r) |
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| 46 | stw r19, OFFSET_R19(\r) |
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| 47 | stw r20, OFFSET_R20(\r) |
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| 48 | stw r21, OFFSET_R21(\r) |
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| 49 | stw r22, OFFSET_R22(\r) |
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| 50 | stw r23, OFFSET_R23(\r) |
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| 51 | stw r24, OFFSET_R24(\r) |
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| 52 | stw r25, OFFSET_R25(\r) |
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| 53 | stw r26, OFFSET_R26(\r) |
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| 54 | stw r27, OFFSET_R27(\r) |
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| 55 | stw r28, OFFSET_R28(\r) |
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| 56 | stw r29, OFFSET_R29(\r) |
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| 57 | stw r30, OFFSET_R30(\r) |
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| 58 | stw r31, OFFSET_R31(\r) |
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| 59 | .endm |
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| 60 | |||
| 61 | .macro CONTEXT_LOAD r |
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| 62 | lwz sp, OFFSET_SP(\r) |
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| 63 | lwz r2, OFFSET_R2(\r) |
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| 64 | lwz r13, OFFSET_R13(\r) |
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| 65 | lwz r14, OFFSET_R14(\r) |
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| 66 | lwz r15, OFFSET_R15(\r) |
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| 67 | lwz r16, OFFSET_R16(\r) |
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| 68 | lwz r17, OFFSET_R17(\r) |
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| 69 | lwz r18, OFFSET_R18(\r) |
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| 70 | lwz r19, OFFSET_R19(\r) |
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| 71 | lwz r20, OFFSET_R20(\r) |
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| 72 | lwz r21, OFFSET_R21(\r) |
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| 73 | lwz r22, OFFSET_R22(\r) |
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| 74 | lwz r23, OFFSET_R23(\r) |
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| 75 | lwz r24, OFFSET_R24(\r) |
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| 76 | lwz r25, OFFSET_R25(\r) |
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| 77 | lwz r26, OFFSET_R26(\r) |
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| 78 | lwz r27, OFFSET_R27(\r) |
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| 79 | lwz r28, OFFSET_R28(\r) |
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| 80 | lwz r29, OFFSET_R29(\r) |
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| 81 | lwz r30, OFFSET_R30(\r) |
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| 82 | lwz r31, OFFSET_R31(\r) |
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| 83 | .endm |
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| 84 | |||
| 1217 | decky | 85 | context_save: |
| 1286 | decky | 86 | CONTEXT_STORE r3 |
| 87 | |||
| 88 | mflr r4 |
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| 89 | stw r4, OFFSET_PC(r3) |
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| 90 | |||
| 91 | mfcr r4 |
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| 92 | stw r4, OFFSET_CR(r3) |
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| 93 | |||
| 94 | # context_save returns 1 |
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| 95 | li r3, 1 |
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| 1217 | decky | 96 | blr |
| 97 | |||
| 98 | |||
| 99 | context_restore: |
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| 1286 | decky | 100 | CONTEXT_LOAD r3 |
| 101 | |||
| 102 | lwz r4, OFFSET_CR(r3) |
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| 103 | mtcr r4 |
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| 104 | |||
| 105 | lwz r4, OFFSET_PC(r3) |
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| 106 | mtlr r4 |
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| 107 | |||
| 108 | # context_restore returns 0 |
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| 109 | li r3, 0 |
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| 1217 | decky | 110 | blr |