1  /* Determine the virtual memory area of a given address.
       2     Copyright (C) 2002-2023 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 */