gdb/memattr.h

   1 /* Memory attributes support, for GDB.
   2    Copyright 2001 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef MEMATTR_H
  22 #define MEMATTR_H
  23
  24 enum mem_access_mode
  25 {
  26   MEM_RW,                       /* read/write */
  27   MEM_RO,                       /* read only */
  28   MEM_WO                        /* write only */
  29 };
  30
  31 enum mem_access_width
  32 {
  33   MEM_WIDTH_UNSPECIFIED,
  34   MEM_WIDTH_8,                  /*  8 bit accesses */
  35   MEM_WIDTH_16,                 /* 16  "      "    */
  36   MEM_WIDTH_32,                 /* 32  "      "    */
  37   MEM_WIDTH_64                  /* 64  "      "    */
  38 };
  39
  40 /* The set of all attributes that can be set for a memory region.
  41
  42    This structure was created so that memory attributes can be passed
  43    to target_ functions without exposing the details of memory region
  44    list, which would be necessary if these fields were simply added to
  45    the mem_region structure.
  46
  47    FIXME: It would be useful if there was a mechanism for targets to
  48    add their own attributes.  For example, the number of wait states. */
  49
  50 struct mem_attrib
  51 {
  52   /* read/write, read-only, or write-only */
  53   enum mem_access_mode mode;
  54
  55   enum mem_access_width width;
  56
  57   /* enables hardware breakpoints */
  58   int hwbreak;
  59
  60   /* enables host-side caching of memory region data */
  61   int cache;
  62
  63   /* enables memory verification.  after a write, memory is re-read
  64      to verify that the write was successful. */
  65   int verify;
  66 };
  67
  68 struct mem_region
  69 {
  70   /* FIXME: memory regions are stored in an unsorted singly-linked
  71      list.  This probably won't scale to handle hundreds of memory
  72      regions --- that many could be needed to describe the allowed
  73      access modes for memory mapped i/o device registers. */
  74   struct mem_region *next;
  75
  76   CORE_ADDR lo;
  77   CORE_ADDR hi;
  78
  79   /* Item number of this memory region. */
  80   int number;
  81
  82   /* Status of this memory region (enabled if non-zero, otherwise disabled) */
  83   int enabled_p;
  84
  85   /* Attributes for this region */
  86   struct mem_attrib attrib;
  87 };
  88
  89 extern struct mem_region *lookup_mem_region(CORE_ADDR);
  90
  91 #endif  /* MEMATTR_H */