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shorts-segment-manager.cpp

/* 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.
 *
 * $URL$
 * $Id$
 *
 */

#include "common/scummsys.h"

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

#include "backends/plugins/elf/shorts-segment-manager.h"

#include "common/debug.h"
#include "common/textconsole.h"

extern char __plugin_hole_start;    // Indicates start of hole in program file for shorts
extern char __plugin_hole_end;            // Indicates end of hole in program file
extern char _gp[];                              // Value of gp register

DECLARE_SINGLETON(ShortSegmentManager);   // For singleton

ShortSegmentManager::ShortSegmentManager() {
      _shortsStart = &__plugin_hole_start ;     //shorts segment begins at the plugin hole we made when linking
      _shortsEnd = &__plugin_hole_end;          //and ends at the end of that hole.
}

ShortSegmentManager::Segment *ShortSegmentManager::newSegment(uint32 size, char *origAddr) {
      char *lastAddress = origAddr;
      Common::List<Segment *>::iterator i;

      // Find a block that fits, starting from the beginning
      for (i = _list.begin(); i != _list.end(); ++i) {
            char *currAddress = (*i)->getStart();

            if (uint32(currAddress) - uint32(lastAddress) >= size)
                  break;

            lastAddress = (*i)->getEnd();
      }

      if ((Elf32_Addr)lastAddress & 3)
            lastAddress += 4 - ((Elf32_Addr)lastAddress & 3);     // Round up to multiple of 4

      if (lastAddress + size > _shortsEnd) {
            warning("elfloader: No space in shorts segment for %x bytes. Last address is %p, max address is %p.",
                        size, lastAddress, _shortsEnd);
            return 0;
      }

      Segment *seg = new Segment(lastAddress, size, origAddr);    // Create a new segment

      if (lastAddress + size > _highestAddress)
            _highestAddress = lastAddress + size;     // Keep track of maximum

      _list.insert(i, seg);

      debug(2, "elfloader: Shorts segment size %x allocated. End = %p. Remaining space = %x. Highest so far is %p.",
                  size, lastAddress + size, _shortsEnd - _list.back()->getEnd(), _highestAddress);

      return seg;
}

void ShortSegmentManager::deleteSegment(ShortSegmentManager::Segment *seg) {
      debug(2, "elfloader: Deleting shorts segment from %p to %p.", seg->getStart(), seg->getEnd());
      _list.remove(seg);
      delete seg;
}

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



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