1 files changed, 89 insertions, 0 deletions
diff --git a/backends/plugins/shorts-segment-manager.cpp b/backends/plugins/shorts-segment-manager.cpp
new file mode 100644
index 0000000000..2376759919
--- /dev/null
+++ b/backends/plugins/shorts-segment-manager.cpp
@@ -0,0 +1,89 @@
+/* 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 */