| 1 | /*
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| 2 | * Copyright (c) 2007 Michal Kebrt, Petr Stepan
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| 3 | *
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * - Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * - Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * - The name of the author may not be used to endorse or promote products
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| 16 | * derived from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | /** @addtogroup arm32interrupt
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| 31 | * @{
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| 32 | */
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| 33 |
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| 34 | #ifndef KERN_arm32_ISTATE_H_
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| 35 | #define KERN_arm32_ISTATE_H_
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| 36 |
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| 37 | #include <trace.h>
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| 38 |
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| 39 | #ifdef KERNEL
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| 40 |
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| 41 | #include <arch/regutils.h>
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| 42 |
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| 43 | #else /* KERNEL */
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| 44 |
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| 45 | #include <libarch/regutils.h>
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| 46 |
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| 47 | #endif /* KERNEL */
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| 48 |
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| 49 | /** Struct representing CPU state saved when an exception occurs. */
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| 50 | typedef struct istate {
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| 51 | uint32_t spsr;
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| 52 | uint32_t sp;
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| 53 | uint32_t lr;
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| 54 |
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| 55 | uint32_t r0;
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| 56 | uint32_t r1;
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| 57 | uint32_t r2;
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| 58 | uint32_t r3;
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| 59 | uint32_t r4;
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| 60 | uint32_t r5;
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| 61 | uint32_t r6;
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| 62 | uint32_t r7;
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| 63 | uint32_t r8;
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| 64 | uint32_t r9;
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| 65 | uint32_t r10;
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| 66 | uint32_t fp;
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| 67 | uint32_t r12;
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| 68 |
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| 69 | uint32_t pc;
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| 70 | } istate_t;
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| 71 |
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| 72 | /** Set Program Counter member of given istate structure.
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| 73 | *
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| 74 | * @param istate istate structure
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| 75 | * @param retaddr new value of istate's PC member
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| 76 | *
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| 77 | */
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| 78 | NO_TRACE static inline void istate_set_retaddr(istate_t *istate,
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| 79 | uintptr_t retaddr)
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| 80 | {
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| 81 | istate->pc = retaddr;
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| 82 | }
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| 83 |
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| 84 | /** Return true if exception happened while in userspace. */
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| 85 | NO_TRACE static inline int istate_from_uspace(istate_t *istate)
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| 86 | {
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| 87 | return (istate->spsr & STATUS_REG_MODE_MASK) == USER_MODE;
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| 88 | }
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| 89 |
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| 90 | /** Return Program Counter member of given istate structure. */
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| 91 | NO_TRACE static inline uintptr_t istate_get_pc(istate_t *istate)
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| 92 | {
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| 93 | return istate->pc;
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| 94 | }
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| 95 |
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| 96 | NO_TRACE static inline uintptr_t istate_get_fp(istate_t *istate)
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| 97 | {
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| 98 | return istate->fp;
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| 99 | }
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| 100 |
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| 101 | #endif
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| 102 |
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| 103 | /** @}
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| 104 | */
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