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memattr.h revision 1.6.4.1 
      1 /* Memory attributes support, for GDB.
      2 
      3    Copyright (C) 2001-2017 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 */
    110