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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.
*
* $URL$
* $Id$
*
*/
#if defined(DYNAMIC_MODULES) && defined(MIPS_TARGET)
#include "shorts-segment-manager.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
#ifdef DEBUG_PLUGINS
#define DBG(x,...) printf(x, ## __VA_ARGS__)
#else
#define DBG(x,...)
#endif
#define seterror(x,...) printf(x, ## __VA_ARGS__)
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(int 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 ((int)(currAddress - 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) {
seterror("Error. No space in shorts segment for %x bytes. Last address is %p, max address is %p.\n",
size, lastAddress, _shortsEnd);
return NULL;
}
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);
DBG("Shorts segment size %x allocated. End = %p. Remaining space = %x. Highest so far is %p.\n",
size, lastAddress + size, _shortsEnd - _list.back()->getEnd(), _highestAddress);
return seg;
}
void ShortSegmentManager::deleteSegment(ShortSegmentManager::Segment *seg) {
DBG("Deleting shorts segment from %p to %p.\n\n", seg->getStart(), seg->getEnd());
_list.remove(seg);
delete seg;
}
#endif /* DYNAMIC_MODULES && MIPS_TARGET */
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