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/* Determine the virtual memory area of a given address.
Copyright (C) 2002-2021 Free Software Foundation, Inc.
Copyright (C) 2003-2006 Paolo Bonzini <bonzini@gnu.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible and Paolo Bonzini. */
#ifndef _STACKVMA_H
#define _STACKVMA_H
#include <stdint.h>
/* Describes a virtual memory area, with some info about the gap between
it and the next or previous virtual memory area. */
struct vma_struct
{
uintptr_t start;
uintptr_t end;
#if STACK_DIRECTION < 0
/* Info about the gap between this VMA and the previous one.
addr must be < vma->start. */
int (*is_near_this) (uintptr_t addr, struct vma_struct *vma);
/* Private field, not provided by all sigsegv_get_vma implementations. */
uintptr_t prev_end;
#endif
#if STACK_DIRECTION > 0
/* Info about the gap between this VMA and the next one.
addr must be > vma->end - 1. */
int (*is_near_this) (uintptr_t addr, struct vma_struct *vma);
/* Private field, not provided by all sigsegv_get_vma implementations. */
uintptr_t next_start;
#endif
};
/* Determines the virtual memory area to which a given address belongs,
and returns 0. Returns -1 if it cannot be determined.
This function is used to determine the stack extent when a fault occurs. */
extern int sigsegv_get_vma (uintptr_t address, struct vma_struct *vma);
/* Defined if sigsegv_get_vma actually works (i.e. does not always fail). */
#if defined __linux__ || defined __ANDROID__ \
|| defined __FreeBSD_kernel__ || defined __FreeBSD__ || defined __DragonFly__ \
|| defined __NetBSD__ || defined __OpenBSD__ \
|| (defined __APPLE__ && defined __MACH__) \
|| defined _AIX || defined __sgi || defined __sun \
|| defined __CYGWIN__ || defined __HAIKU__
# define HAVE_STACKVMA 1
#endif
#endif /* _STACKVMA_H */
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