shorts-segment-manager.h

/* 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 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
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef SHORTS_SEGMENT_MANAGER_H
#define SHORTS_SEGMENT_MANAGER_H

#include "common/scummsys.h"

#if defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) && defined(MIPS_TARGET)

#include "backends/plugins/elf/elf32.h"

#include "common/singleton.h"
#include "common/list.h"

#define ShortsMan ShortSegmentManager::instance()

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 (addr >= _shortsStart && addr < _shortsEnd);
    }

    class Segment {
    private:
        friend class ShortSegmentManager;
        Segment(char *start, uint32 size, char *origAddr) :
            _startAddress(start),
            _size(size),
            _origAddress(origAddr) {
        }

        virtual ~Segment() {
        }

        char *_startAddress;        // Start of shorts segment in memory
        uint32 _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 (addr >= _startAddress && addr <= _startAddress + _size);
        }
    };

    Segment *newSegment(uint32 size, char *origAddr);
    void deleteSegment(Segment *);

private:
    ShortSegmentManager();
    friend class Common::Singleton<ShortSegmentManager>;
    Common::List<Segment *> _list;
    char *_highestAddress;
};

#endif // defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) && defined(MIPS_TARGET)

#endif /* SHORTS_SEGMENT_MANAGER_H */