gdb/memattr.h

   1 /* Memory attributes support, for GDB.
   2
   3    Copyright (C) 2001-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef MEMATTR_H
  21 #define MEMATTR_H
  22
  23 enum mem_access_mode
  24 {
  25   MEM_NONE,                     /* Memory that is not physically present.  */
  26   MEM_RW,                       /* read/write */
  27   MEM_RO,                       /* read only */
  28   MEM_WO,                       /* write only */
  29
  30   /* Read/write, but special steps are required to write to it.  */
  31   MEM_FLASH
  32 };
  33
  34 enum mem_access_width
  35 {
  36   MEM_WIDTH_UNSPECIFIED,
  37   MEM_WIDTH_8,                  /*  8 bit accesses */
  38   MEM_WIDTH_16,                 /* 16  "      "    */
  39   MEM_WIDTH_32,                 /* 32  "      "    */
  40   MEM_WIDTH_64                  /* 64  "      "    */
  41 };
  42
  43 /* The set of all attributes that can be set for a memory region.
  44
  45    This structure was created so that memory attributes can be passed
  46    to target_ functions without exposing the details of memory region
  47    list, which would be necessary if these fields were simply added to
  48    the mem_region structure.
  49
  50    FIXME: It would be useful if there was a mechanism for targets to
  51    add their own attributes.  For example, the number of wait states.  */
  52
  53 struct mem_attrib
  54 {
  55   static mem_attrib unknown ()
  56   {
  57     mem_attrib attrib;
  58
  59     attrib.mode = MEM_NONE;
  60
  61     return attrib;
  62   }
  63
  64   /* read/write, read-only, or write-only */
  65   enum mem_access_mode mode = MEM_RW;
  66
  67   enum mem_access_width width = MEM_WIDTH_UNSPECIFIED;
  68
  69   /* enables hardware breakpoints */
  70   int hwbreak = 0;
  71
  72   /* enables host-side caching of memory region data */
  73   int cache = 0;
  74
  75   /* Enables memory verification.  After a write, memory is re-read
  76      to verify that the write was successful.  */
  77   int verify = 0;
  78
  79   /* Block size.  Only valid if mode == MEM_FLASH.  */
  80   int blocksize = -1;
  81 };
  82
  83 struct mem_region
  84 {
  85   /* Create a mem_region with default attributes.  */
  86
  87   mem_region (CORE_ADDR lo_, CORE_ADDR hi_)
  88     : lo (lo_), hi (hi_)
  89   {}
  90
  91   /* Create a mem_region with access mode MODE_, but otherwise default
  92      attributes.  */
  93
  94   mem_region (CORE_ADDR lo_, CORE_ADDR hi_, mem_access_mode mode_)
  95     : lo (lo_), hi (hi_)
  96   {
  97     attrib.mode = mode_;
  98   }
  99
 100   /* Create a mem_region with attributes ATTRIB_.  */
 101
 102   mem_region (CORE_ADDR lo_, CORE_ADDR hi_, const mem_attrib &attrib_)
 103     : lo (lo_), hi (hi_), attrib (attrib_)
 104   {}
 105
 106   bool operator< (const mem_region &other) const
 107   {
 108     return this->lo < other.lo;
 109   }
 110
 111   /* Lowest address in the region.  */
 112   CORE_ADDR lo;
 113   /* Address past the highest address of the region.
 114      If 0, upper bound is "infinity".  */
 115   CORE_ADDR hi;
 116
 117   /* Item number of this memory region.  */
 118   int number = 0;
 119
 120   /* Status of this memory region (enabled if true, otherwise
 121      disabled).  */
 122   bool enabled_p = true;
 123
 124   /* Attributes for this region.  */
 125   mem_attrib attrib;
 126 };
 127
 128 extern struct mem_region *lookup_mem_region (CORE_ADDR);
 129
 130 void invalidate_target_mem_regions (void);
 131
 132 #endif  /* MEMATTR_H */