| 1 | /*
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| 2 | * Copyright (c) 2010 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 | /** @addtogroup abs32leinterrupt
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef KERN_abs32le_ISTATE_H_
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| 36 | #define KERN_abs32le_ISTATE_H_
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| 37 |
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| 38 | #include <trace.h>
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| 39 |
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| 40 | #ifdef KERNEL
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| 41 |
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| 42 | #include <verify.h>
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| 43 |
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| 44 | #else /* KERNEL */
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| 45 |
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| 46 | #define REQUIRES_EXTENT_MUTABLE(arg)
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| 47 | #define WRITES(arg)
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| 48 |
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| 49 | #endif /* KERNEL */
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| 50 |
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| 51 | /*
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| 52 | * On real hardware this stores the registers which
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| 53 | * need to be preserved during interupts.
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| 54 | */
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| 55 | typedef struct istate {
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| 56 | uintptr_t ip;
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| 57 | uintptr_t fp;
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| 58 | uint32_t stack[];
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| 59 | } istate_t;
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| 60 |
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| 61 | NO_TRACE static inline int istate_from_uspace(istate_t *istate)
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| 62 | REQUIRES_EXTENT_MUTABLE(istate)
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| 63 | {
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| 64 | /* On real hardware this checks whether the interrupted
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| 65 | context originated from user space. */
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| 66 |
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| 67 | return !(istate->ip & UINT32_C(0x80000000));
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| 68 | }
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| 69 |
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| 70 | NO_TRACE static inline void istate_set_retaddr(istate_t *istate,
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| 71 | uintptr_t retaddr)
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| 72 | WRITES(&istate->ip)
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| 73 | {
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| 74 | /* On real hardware this sets the instruction pointer. */
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| 75 |
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| 76 | istate->ip = retaddr;
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| 77 | }
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| 78 |
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| 79 | NO_TRACE static inline uintptr_t istate_get_pc(istate_t *istate)
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| 80 | REQUIRES_EXTENT_MUTABLE(istate)
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| 81 | {
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| 82 | /* On real hardware this returns the instruction pointer. */
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| 83 |
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| 84 | return istate->ip;
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| 85 | }
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| 86 |
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| 87 | NO_TRACE static inline uintptr_t istate_get_fp(istate_t *istate)
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| 88 | REQUIRES_EXTENT_MUTABLE(istate)
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| 89 | {
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| 90 | /* On real hardware this returns the frame pointer. */
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| 91 |
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| 92 | return istate->fp;
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| 93 | }
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| 94 |
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| 95 | #endif
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| 96 |
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| 97 | /** @}
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| 98 | */
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