src/stackvma.h

   1 /* Determine the virtual memory area of a given address.
   2    Copyright (C) 2002, 2006  Bruno Haible <bruno@clisp.org>
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #ifndef _STACKVMA_H
  19 #define _STACKVMA_H
  20
  21 /* Describes a virtual memory area, with some info about the gap between
  22    it and the next or previous virtual memory area.  */
  23 struct vma_struct
  24 {
  25   unsigned long start;
  26   unsigned long end;
  27 #if STACK_DIRECTION < 0
  28   /* Info about the gap between this VMA and the previous one.
  29      addr must be < vma->start.  */
  30   int (*is_near_this) (unsigned long addr, struct vma_struct *vma);
  31   /* Private field, not provided by all sigsegv_get_vma implementations.  */
  32   unsigned long prev_end;
  33 #endif
  34 #if STACK_DIRECTION > 0
  35   /* Info about the gap between this VMA and the next one.
  36      addr must be > vma->end - 1.  */
  37   int (*is_near_this) (unsigned long addr, struct vma_struct *vma);
  38   /* Private field, not provided by all sigsegv_get_vma implementations.  */
  39   unsigned long next_start;
  40 #endif
  41 };
  42
  43 /* Determines the virtual memory area to which a given address belongs,
  44    and returns 0.  Returns -1 if it cannot be determined.
  45    This function is used to determine the stack extent when a fault occurs.  */
  46 extern int sigsegv_get_vma (unsigned long address, struct vma_struct *vma);
  47
  48 #endif /* _STACKVMA_H */