gdb/memattr.h

   1 /* Memory attributes support, for GDB.
   2
   3    Copyright (C) 2001-2015 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 #include "vec.h"
  24
  25 enum mem_access_mode
  26 {
  27   MEM_NONE,                     /* Memory that is not physically present.  */
  28   MEM_RW,                       /* read/write */
  29   MEM_RO,                       /* read only */
  30   MEM_WO,                       /* write only */
  31
  32   /* Read/write, but special steps are required to write to it.  */
  33   MEM_FLASH
  34 };
  35
  36 enum mem_access_width
  37 {
  38   MEM_WIDTH_UNSPECIFIED,
  39   MEM_WIDTH_8,                  /*  8 bit accesses */
  40   MEM_WIDTH_16,                 /* 16  "      "    */
  41   MEM_WIDTH_32,                 /* 32  "      "    */
  42   MEM_WIDTH_64                  /* 64  "      "    */
  43 };
  44
  45 /* The set of all attributes that can be set for a memory region.
  46
  47    This structure was created so that memory attributes can be passed
  48    to target_ functions without exposing the details of memory region
  49    list, which would be necessary if these fields were simply added to
  50    the mem_region structure.
  51
  52    FIXME: It would be useful if there was a mechanism for targets to
  53    add their own attributes.  For example, the number of wait states.  */
  54
  55 struct mem_attrib
  56 {
  57   /* read/write, read-only, or write-only */
  58   enum mem_access_mode mode;
  59
  60   enum mem_access_width width;
  61
  62   /* enables hardware breakpoints */
  63   int hwbreak;
  64
  65   /* enables host-side caching of memory region data */
  66   int cache;
  67
  68   /* Enables memory verification.  After a write, memory is re-read
  69      to verify that the write was successful.  */
  70   int verify;
  71
  72   /* Block size.  Only valid if mode == MEM_FLASH.  */
  73   int blocksize;
  74 };
  75
  76 struct mem_region
  77 {
  78   /* Lowest address in the region.  */
  79   CORE_ADDR lo;
  80   /* Address past the highest address of the region.
  81      If 0, upper bound is "infinity".  */
  82   CORE_ADDR hi;
  83
  84   /* Item number of this memory region.  */
  85   int number;
  86
  87   /* Status of this memory region (enabled if non-zero, otherwise
  88      disabled).  */
  89   int enabled_p;
  90
  91   /* Attributes for this region.  */
  92   struct mem_attrib attrib;
  93 };
  94
  95 /* Declare a vector type for a group of mem_region structures.  The
  96    typedef is necessary because vec.h can not handle a struct tag.
  97    Except during construction, these vectors are kept sorted.  */
  98 typedef struct mem_region mem_region_s;
  99 DEF_VEC_O(mem_region_s);
 100
 101 extern struct mem_region *lookup_mem_region(CORE_ADDR);
 102
 103 void invalidate_target_mem_regions (void);
 104
 105 void mem_region_init (struct mem_region *);
 106
 107 int mem_region_cmp (const void *, const void *);
 108
 109 #endif  /* MEMATTR_H */