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