| 1 | #
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| 2 | # Copyright (c) 2005 Martin Decky
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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 |
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| 29 | #include <arch/asm/regname.h>
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| 30 | #include <arch/context_offset.h>
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| 31 |
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| 32 | .text
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| 33 |
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| 34 | .global context_save_arch
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| 35 | .global context_restore_arch
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| 36 |
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| 37 | .macro CONTEXT_STORE r
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| 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 |
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| 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 |
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| 85 | context_save_arch:
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| 86 | CONTEXT_STORE r3
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| 87 |
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| 88 | mflr r4
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| 89 | stw r4, OFFSET_PC(r3)
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| 90 |
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| 91 | mfcr r4
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| 92 | stw r4, OFFSET_CR(r3)
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| 93 |
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| 94 | # context_save returns 1
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| 95 | li r3, 1
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| 96 | blr
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| 97 |
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| 98 | context_restore_arch:
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| 99 | CONTEXT_LOAD r3
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| 100 |
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| 101 | lwz r4, OFFSET_CR(r3)
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| 102 | mtcr r4
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| 103 |
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| 104 | lwz r4, OFFSET_PC(r3)
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| 105 | mtlr r4
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| 106 |
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| 107 | # context_restore returns 0
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| 108 | li r3, 0
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| 109 | blr
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