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88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/scummsys.h"
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#if defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) && defined(MIPS_TARGET)
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#include "backends/plugins/elf/shorts-segment-manager.h"
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#include "common/debug.h"
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#include "common/textconsole.h"
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extern char __plugin_hole_start; // Indicates start of hole in program file for shorts
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extern char __plugin_hole_end; // Indicates end of hole in program file
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extern char _gp[]; // Value of gp register
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namespace Common {
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DECLARE_SINGLETON(ShortSegmentManager); // For singleton
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}
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ShortSegmentManager::ShortSegmentManager() {
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_shortsStart = &__plugin_hole_start ; //shorts segment begins at the plugin hole we made when linking
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_shortsEnd = &__plugin_hole_end; //and ends at the end of that hole.
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}
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ShortSegmentManager::Segment *ShortSegmentManager::newSegment(uint32 size, char *origAddr) {
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char *lastAddress = origAddr;
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Common::List<Segment *>::iterator i;
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// Find a block that fits, starting from the beginning
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for (i = _list.begin(); i != _list.end(); ++i) {
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char *currAddress = (*i)->getStart();
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if (uint32(currAddress) - uint32(lastAddress) >= size)
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break;
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lastAddress = (*i)->getEnd();
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}
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if ((Elf32_Addr)lastAddress & 3)
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lastAddress += 4 - ((Elf32_Addr)lastAddress & 3); // Round up to multiple of 4
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if (lastAddress + size > _shortsEnd) {
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warning("elfloader: No space in shorts segment for %x bytes. Last address is %p, max address is %p.",
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size, lastAddress, _shortsEnd);
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return 0;
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}
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Segment *seg = new Segment(lastAddress, size, origAddr); // Create a new segment
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if (lastAddress + size > _highestAddress)
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_highestAddress = lastAddress + size; // Keep track of maximum
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_list.insert(i, seg);
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debug(2, "elfloader: Shorts segment size %x allocated. End = %p. Remaining space = %x. Highest so far is %p.",
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size, lastAddress + size, _shortsEnd - _list.back()->getEnd(), _highestAddress);
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return seg;
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}
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void ShortSegmentManager::deleteSegment(ShortSegmentManager::Segment *seg) {
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debug(2, "elfloader: Deleting shorts segment from %p to %p.", seg->getStart(), seg->getEnd());
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_list.remove(seg);
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delete seg;
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}
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#endif // defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) && defined(MIPS_TARGET)
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