diff options
Diffstat (limited to 'backends/plugins/elf/shorts-segment-manager.cpp')
-rw-r--r-- | backends/plugins/elf/shorts-segment-manager.cpp | 91 |
1 files changed, 90 insertions, 1 deletions
diff --git a/backends/plugins/elf/shorts-segment-manager.cpp b/backends/plugins/elf/shorts-segment-manager.cpp index 5692c8a07b..99a765287b 100644 --- a/backends/plugins/elf/shorts-segment-manager.cpp +++ b/backends/plugins/elf/shorts-segment-manager.cpp @@ -1 +1,90 @@ -dummy +/* 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) + + |