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/*--- Address space manager. pub_tool_aspacemgr.h ---*/
This file is part of Valgrind, a dynamic binary instrumentation
Copyright (C) 2000-2013 Julian Seward
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 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
#include "pub_tool_basics.h" // VG_ macro
// Definition of address-space segments
/* Describes segment kinds. */
enum {
SkFree, // unmapped space
SkAnonC, // anonymous mapping belonging to the client
SkAnonV, // anonymous mapping belonging to valgrind
SkFileC, // file mapping belonging to the client
SkFileV, // file mapping belonging to valgrind
SkShmC, // shared memory segment belonging to the client
SkResvn // reservation
/* Describes how a reservation segment can be resized. */
enum {
SmLower, // lower end can move up
SmFixed, // cannot be shrunk
SmUpper // upper end can move down
/* Describes a segment. Invariants:
kind == SkFree:
// the only meaningful fields are .start and .end
kind == SkAnon{C,V}:
// smode==SmFixed
// there's no associated file:
dev==ino==foff = 0, fnidx == -1
// segment may have permissions
kind == SkFile{C,V}:
// smode==SmFixed
moveLo == moveHi == NotMovable, maxlen == 0
// there is an associated file
// segment may have permissions
kind == SkShmC:
// smode==SmFixed
// there's no associated file:
dev==ino==foff = 0, fnidx == -1
// segment may have permissions
kind == SkResvn
// the segment may be resized if required
// there's no associated file:
dev==ino==foff = 0, fnidx == -1
// segment has no permissions
hasR==hasW==hasX==anyTranslated == False
Also: anyTranslated==True is only allowed in SkFileV and SkAnonV
(viz, not allowed to make translations from non-client areas)
struct {
SegKind kind;
/* Extent (SkFree, SkAnon{C,V}, SkFile{C,V}, SkResvn) */
Addr start; // lowest address in range
Addr end; // highest address in range
/* Shrinkable? (SkResvn only) */
ShrinkMode smode;
/* Associated file (SkFile{C,V} only) */
ULong dev;
ULong ino;
Off64T offset;
UInt mode;
Int fnIdx; // file name table index, if name is known
/* Permissions (SkAnon{C,V}, SkFile{C,V} only) */
Bool hasR;
Bool hasW;
Bool hasX;
Bool hasT; // True --> translations have (or MAY have)
// been taken from this segment
Bool isCH; // True --> is client heap (SkAnonC ONLY)
/* Collect up the start addresses of all non-free, non-resvn segments.
The interface is a bit strange in order to avoid potential
segment-creation races caused by dynamic allocation of the result
buffer *starts.
The function first computes how many entries in the result
buffer *starts will be needed. If this number <= nStarts,
they are placed in starts[0..], and the number is returned.
If nStarts is not large enough, nothing is written to
starts[0..], and the negation of the size is returned.
Correct use of this function may mean calling it multiple times in
order to establish a suitably-sized buffer. */
extern Int VG_(am_get_segment_starts)( Addr* starts, Int nStarts );
/* Finds the segment containing 'a'. Only returns file/anon/resvn
segments. This returns a 'NSegment const *' - a pointer to
readonly data. */
extern NSegment const * VG_(am_find_nsegment) ( Addr a );
/* Get the filename corresponding to this segment, if known and if it
has one. The returned name's storage cannot be assumed to be
persistent, so the caller should immediately copy the name
elsewhere. This may return NULL if the file name is not known or
for arbitrary other implementation-dependent reasons, so callers
need to be able to handle a NULL return value. */
extern const HChar* VG_(am_get_filename)( NSegment const * );
/* Is the area [start .. start+len-1] validly accessible by the
client with at least the permissions 'prot' ? To find out
simply if said area merely belongs to the client, pass
VKI_PROT_NONE as 'prot'. Will return False if any part of the
area does not belong to the client or does not have at least
the stated permissions. */
extern Bool VG_(am_is_valid_for_client) ( Addr start, SizeT len,
UInt prot );
/* Really just a wrapper around VG_(am_mmap_anon_float_valgrind). */
extern void* VG_(am_shadow_alloc)(SizeT size);
/* Unmap the given address range and update the segment array
accordingly. This fails if the range isn't valid for valgrind. */
extern SysRes VG_(am_munmap_valgrind)( Addr start, SizeT length );
/*--- end ---*/