| 1 | /* Determine the virtual memory area of a given address.
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| 2 | Copyright (C) 2002-2021 Free Software Foundation, Inc.
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| 3 | Copyright (C) 2003-2006 Paolo Bonzini <[email protected]>
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 2 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | /* Written by Bruno Haible and Paolo Bonzini. */
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| 19 |
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| 20 | #ifndef _STACKVMA_H
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| 21 | #define _STACKVMA_H
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| 22 |
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| 23 | #include <stdint.h>
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| 24 |
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| 25 | /* Describes a virtual memory area, with some info about the gap between
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| 26 | it and the next or previous virtual memory area. */
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| 27 | struct vma_struct
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| 28 | {
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| 29 | uintptr_t start;
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| 30 | uintptr_t end;
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| 31 | #if STACK_DIRECTION < 0
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| 32 | /* Info about the gap between this VMA and the previous one.
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| 33 | addr must be < vma->start. */
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| 34 | int (*is_near_this) (uintptr_t addr, struct vma_struct *vma);
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| 35 | /* Private field, not provided by all sigsegv_get_vma implementations. */
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| 36 | uintptr_t prev_end;
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| 37 | #endif
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| 38 | #if STACK_DIRECTION > 0
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| 39 | /* Info about the gap between this VMA and the next one.
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| 40 | addr must be > vma->end - 1. */
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| 41 | int (*is_near_this) (uintptr_t addr, struct vma_struct *vma);
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| 42 | /* Private field, not provided by all sigsegv_get_vma implementations. */
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| 43 | uintptr_t next_start;
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| 44 | #endif
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| 45 | };
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| 46 |
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| 47 | /* Determines the virtual memory area to which a given address belongs,
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| 48 | and returns 0. Returns -1 if it cannot be determined.
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| 49 | This function is used to determine the stack extent when a fault occurs. */
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| 50 | extern int sigsegv_get_vma (uintptr_t address, struct vma_struct *vma);
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| 51 |
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| 52 | /* Defined if sigsegv_get_vma actually works (i.e. does not always fail). */
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| 53 | #if defined __linux__ || defined __ANDROID__ \
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| 54 | || defined __FreeBSD_kernel__ || defined __FreeBSD__ || defined __DragonFly__ \
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| 55 | || defined __NetBSD__ || defined __OpenBSD__ \
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| 56 | || (defined __APPLE__ && defined __MACH__) \
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| 57 | || defined _AIX || defined __sgi || defined __sun \
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| 58 | || defined __CYGWIN__ || defined __HAIKU__
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| 59 | # define HAVE_STACKVMA 1
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| 60 | #endif
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| 61 |
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| 62 | #endif /* _STACKVMA_H */
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