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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef SHORTS_SEGMENT_MANAGER_H
#define SHORTS_SEGMENT_MANAGER_H
#include "common/singleton.h"
#include "common/list.h"
#include "elf32.h"
#define ShortsMan ShortSegmentManager::instance()
/**
* Manages the segments of small data put in the gp-relative area for MIPS processors,
* and lets these segments be handled differently in the ELF loader.
* Since there's no true dynamic linker to change the GP register between plugins and the main engine,
* custom linker scripts ensure the GP-area is in the same place for both.
*/
class ShortSegmentManager : public Common::Singleton<ShortSegmentManager> {
private:
char *_shortsStart;
char *_shortsEnd;
public:
char *getShortsStart() {
return _shortsStart;
}
// Returns whether or not an absolute address is in the GP-relative section.
bool inGeneralSegment(char *addr) {
return ((char *)addr >= _shortsStart && (char *)addr < _shortsEnd);
}
class Segment {
private:
friend class ShortSegmentManager;
Segment(char *start, int size, char *origAddr) : _startAddress(start), _size(size), _origAddress(origAddr) {}
~Segment() {}
char *_startAddress; // Start of shorts segment in memory
int _size; // Size of shorts segment
char *_origAddress; // Original address this segment was supposed to be at
public:
char *getStart() {
return _startAddress;
}
char *getEnd() {
return (_startAddress + _size);
}
Elf32_Addr getOffset() {
return (Elf32_Addr)(_startAddress - _origAddress);
}
bool inSegment(char *addr) {
return ((char *)addr >= _startAddress && (char *)addr <= _startAddress + _size);
}
};
Segment *newSegment(int size, char *origAddr);
void deleteSegment(Segment *);
private:
ShortSegmentManager();
friend class Common::Singleton<ShortSegmentManager>;
Common::List<Segment *> _list;
char *_highestAddress;
};
#endif /* SHORTS_SEGMENT_MANAGER_H */
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