[84176f3] | 1 | /*
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| 2 | * Copyright (c) 2015 Petr Pavlu
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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 <abi/asmtool.h>
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| 30 | #include <arch/context_struct.h>
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| 31 |
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| 32 | .text
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| 33 |
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| 34 | /* Static checks for the context_t save/load. */
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| 35 | #if CONTEXT_OFFSET_SP + 8 != CONTEXT_OFFSET_PC
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| 36 | #error sp and pc are not successive in context_t
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| 37 | #endif
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| 38 | #if CONTEXT_OFFSET_X19 + 8 != CONTEXT_OFFSET_X20
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| 39 | #error x19 and x20 are not successive in context_t
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| 40 | #endif
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| 41 | #if CONTEXT_OFFSET_X21 + 8 != CONTEXT_OFFSET_X22
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| 42 | #error x21 and x22 are not successive in context_t
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| 43 | #endif
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| 44 | #if CONTEXT_OFFSET_X23 + 8 != CONTEXT_OFFSET_X24
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| 45 | #error x23 and x24 are not successive in context_t
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| 46 | #endif
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| 47 | #if CONTEXT_OFFSET_X25 + 8 != CONTEXT_OFFSET_X26
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| 48 | #error x25 and x26 are not successive in context_t
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| 49 | #endif
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| 50 | #if CONTEXT_OFFSET_X27 + 8 != CONTEXT_OFFSET_X28
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| 51 | #error x27 and x28 are not successive in context_t
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| 52 | #endif
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| 53 |
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| 54 | FUNCTION_BEGIN(context_save_arch)
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| 55 | /* Save callee-saved registers into context_t pointed by x0. */
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| 56 | mov x1, sp
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| 57 | stp x1, x30, [x0, #CONTEXT_OFFSET_SP]
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| 58 | stp x19, x20, [x0, #CONTEXT_OFFSET_X19]
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| 59 | stp x21, x22, [x0, #CONTEXT_OFFSET_X21]
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| 60 | stp x23, x24, [x0, #CONTEXT_OFFSET_X23]
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| 61 | stp x25, x26, [x0, #CONTEXT_OFFSET_X25]
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| 62 | stp x27, x28, [x0, #CONTEXT_OFFSET_X27]
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| 63 | str x29, [x0, #CONTEXT_OFFSET_X29]
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| 64 |
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| 65 | /* Return 1. */
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| 66 | mov x0, #1
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| 67 | ret
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| 68 | FUNCTION_END(context_save_arch)
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| 69 |
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| 70 | FUNCTION_BEGIN(context_restore_arch)
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| 71 | /* Restore callee-saved registers from context_t pointed by x0. */
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| 72 | ldp x1, x30, [x0, #CONTEXT_OFFSET_SP]
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| 73 | mov sp, x1
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| 74 | ldp x19, x20, [x0, #CONTEXT_OFFSET_X19]
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| 75 | ldp x21, x22, [x0, #CONTEXT_OFFSET_X21]
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| 76 | ldp x23, x24, [x0, #CONTEXT_OFFSET_X23]
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| 77 | ldp x25, x26, [x0, #CONTEXT_OFFSET_X25]
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| 78 | ldp x27, x28, [x0, #CONTEXT_OFFSET_X27]
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| 79 | ldr x29, [x0, #CONTEXT_OFFSET_X29]
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| 80 |
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| 81 | /* Return 0. */
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| 82 | mov x0, #0
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| 83 | ret
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| 84 | FUNCTION_END(context_restore_arch)
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