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/* Memory attributes support, for GDB.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>. */
#ifndef MEMATTR_H
#define MEMATTR_H
enum mem_access_mode
MEM_NONE, /* Memory that is not physically present. */
MEM_RW, /* read/write */
MEM_RO, /* read only */
MEM_WO, /* write only */
/* Read/write, but special steps are required to write to it. */
enum mem_access_width
MEM_WIDTH_8, /* 8 bit accesses */
MEM_WIDTH_16, /* 16 " " */
MEM_WIDTH_32, /* 32 " " */
MEM_WIDTH_64 /* 64 " " */
/* The set of all attributes that can be set for a memory region.
This structure was created so that memory attributes can be passed
to target_ functions without exposing the details of memory region
list, which would be necessary if these fields were simply added to
the mem_region structure.
FIXME: It would be useful if there was a mechanism for targets to
add their own attributes. For example, the number of wait states. */
struct mem_attrib
static mem_attrib unknown ()
mem_attrib attrib;
attrib.mode = MEM_NONE;
return attrib;
/* read/write, read-only, or write-only */
enum mem_access_mode mode = MEM_RW;
enum mem_access_width width = MEM_WIDTH_UNSPECIFIED;
/* enables hardware breakpoints */
int hwbreak = 0;
/* enables host-side caching of memory region data */
int cache = 0;
/* Enables memory verification. After a write, memory is re-read
to verify that the write was successful. */
int verify = 0;
/* Block size. Only valid if mode == MEM_FLASH. */
int blocksize = -1;
struct mem_region
/* Create a mem_region with default attributes. */
mem_region (CORE_ADDR lo_, CORE_ADDR hi_)
: lo (lo_), hi (hi_)
/* Create a mem_region with access mode MODE_, but otherwise default
attributes. */
mem_region (CORE_ADDR lo_, CORE_ADDR hi_, mem_access_mode mode_)
: lo (lo_), hi (hi_)
attrib.mode = mode_;
/* Create a mem_region with attributes ATTRIB_. */
mem_region (CORE_ADDR lo_, CORE_ADDR hi_, const mem_attrib &attrib_)
: lo (lo_), hi (hi_), attrib (attrib_)
bool operator< (const mem_region &other) const
return this->lo < other.lo;
/* Lowest address in the region. */
/* Address past the highest address of the region.
If 0, upper bound is "infinity". */
/* Item number of this memory region. */
int number = 0;
/* Status of this memory region (enabled if true, otherwise
disabled). */
bool enabled_p = true;
/* Attributes for this region. */
mem_attrib attrib;
extern struct mem_region *lookup_mem_region (CORE_ADDR);
void invalidate_target_mem_regions (void);
#endif /* MEMATTR_H */