PLUGINS: Move all ELF loader related files to its own directory.

svn-id: r52555

14 files changed, 1880 insertions, 0 deletions

diff --git a/backends/plugins/elf/arm-loader.cpp b/backends/plugins/elf/arm-loader.cpp
new file mode 100644
index 0000000000..ab1129d34c
--- /dev/null
+++ b/backends/plugins/elf/arm-loader.cpp
@@ -0,0 +1,140 @@
+/* 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(ARM_TARGET)
+
+#include "backends/plugins/elf/elf-loader.h"
+#include "backends/plugins/elf/arm-loader.h"
+
+#include "common/debug.h"
+
+/**
+ * Follow the instruction of a relocation section.
+ *
+ * @param DLFile		SeekableReadStream of File
+ * @param fileOffset	Offset into the File
+ * @param size			Size of relocation section
+ * @param relSegment	Base address of relocated segment in memory (memory offset)
+ */
+bool ARMDLObject::relocate(Common::SeekableReadStream* DLFile, unsigned long offset, unsigned long size, void *relSegment) {
+	Elf32_Rel *rel = 0; //relocation entry
+
+	// Allocate memory for relocation table
+	if (!(rel = (Elf32_Rel *)malloc(size))) {
+		warning("elfloader: Out of memory.");
+		return false;
+	}
+
+	// Read in our relocation table
+	if (!DLFile->seek(offset, SEEK_SET) ||
+			DLFile->read(rel, size) != size) {
+		warning("elfloader: Relocation table load failed.");
+		free(rel);
+		return false;
+	}
+
+	// Treat each relocation entry. Loop over all of them
+	int cnt = size / sizeof(*rel);
+
+	debug(2, "elfloader: Loaded relocation table. %d entries. base address=%p", cnt, relSegment);
+
+	int a = 0;
+	unsigned int relocation = 0;
+
+	// Loop over relocation entries
+	for (int i = 0; i < cnt; i++) {
+		// Get the symbol this relocation entry is referring to
+		Elf32_Sym *sym = (Elf32_Sym *)(_symtab) + (REL_INDEX(rel[i].r_info));
+
+		// Get the target instruction in the code
+		unsigned int *target = (unsigned int *)((char *)relSegment + rel[i].r_offset);
+
+		unsigned int origTarget = *target;	//Save for debugging
+
+		// Act differently based on the type of relocation
+		switch (REL_TYPE(rel[i].r_info)) {
+		case R_ARM_ABS32:
+			if (sym->st_shndx < SHN_LOPROC) {			// Only shift for plugin section.
+				a = *target;							// Get full 32 bits of addend
+				relocation = a + (Elf32_Addr)_segment;			   // Shift by main offset
+
+				*target = relocation;
+
+				debug(8, "elfloader: R_ARM_ABS32: i=%d, a=%x, origTarget=%x, target=%x", i, a, origTarget, *target);
+			}
+			break;
+
+		case R_ARM_THM_CALL:
+			debug(8, "elfloader: R_ARM_THM_CALL: PC-relative jump, ld takes care of necessary relocation work for us.");
+			break;
+
+		case R_ARM_CALL:
+			debug(8, "elfloader: R_ARM_CALL: PC-relative jump, ld takes care of necessary relocation work for us.");
+			break;
+
+		case R_ARM_JUMP24:
+			debug(8, "elfloader: R_ARM_JUMP24: PC-relative jump, ld takes care of all relocation work for us.");
+			break;
+
+		case R_ARM_V4BX:
+			debug(8, "elfloader: R_ARM_V4BX: No relocation calculation necessary.");
+			break;
+
+		default:
+			warning("elfloader: Unknown relocation type %d.", REL_TYPE(rel[i].r_info));
+			free(rel);
+			return false;
+		}
+	}
+
+	free(rel);
+	return true;
+}
+
+bool ARMDLObject::relocateRels(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) {
+	// Loop over sections, finding relocation sections
+	for (int i = 0; i < ehdr->e_shnum; i++) {
+		Elf32_Shdr *curShdr = &(shdr[i]);
+
+		if ((curShdr->sh_type == SHT_REL || curShdr->sh_type == SHT_RELA) &&		// Check for a relocation section
+				curShdr->sh_entsize == sizeof(Elf32_Rel) &&			// Check for proper relocation size
+				(int)curShdr->sh_link == _symtab_sect &&			// Check that the sh_link connects to our symbol table
+				curShdr->sh_info < ehdr->e_shnum &&					// Check that the relocated section exists
+				(shdr[curShdr->sh_info].sh_flags & SHF_ALLOC)) {  	// Check if relocated section resides in memory
+
+			if (curShdr->sh_type == SHT_RELA) {
+				warning("elfloader: RELA entries not supported yet!");
+				return false;
+			}
+
+			if (!relocate(DLFile, curShdr->sh_offset, curShdr->sh_size, _segment))
+				return false;
+		}
+	}
+
+	return true;
+}
+
+#endif /* defined(DYNAMIC_MODULES) && defined(ARM_TARGET) */
diff --git a/backends/plugins/elf/arm-loader.h b/backends/plugins/elf/arm-loader.h
new file mode 100644
index 0000000000..52a3be5447
--- /dev/null
+++ b/backends/plugins/elf/arm-loader.h
@@ -0,0 +1,39 @@
+/* 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(ARM_TARGET)
+
+#include "backends/plugins/elf/elf-loader.h"
+
+class ARMDLObject : public DLObject {
+protected:
+	virtual bool relocate(Common::SeekableReadStream* DLFile, unsigned long offset, unsigned long size, void *relSegment);
+	virtual bool relocateRels(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr);
+
+public:
+	ARMDLObject() : DLObject() {}
+};
+
+#endif /* defined(DYNAMIC_MODULES) && defined(ARM_TARGET) */
diff --git a/backends/plugins/elf/elf-loader.cpp b/backends/plugins/elf/elf-loader.cpp
new file mode 100644
index 0000000000..5ce8af6295
--- /dev/null
+++ b/backends/plugins/elf/elf-loader.cpp
@@ -0,0 +1,445 @@
+/* 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(ELF_LOADER_TARGET)
+
+#include <string.h>
+#include <stdarg.h>
+
+#ifdef __PSP__
+#include <psputils.h>
+#include <psputilsforkernel.h>
+#endif
+
+#ifdef __DS__
+#include <nds.h>
+#endif
+
+#ifdef __WII__
+#include <malloc.h>
+#include <ogc/cache.h>
+#endif
+
+#include "backends/plugins/elf/elf-loader.h"
+
+#include "common/debug.h"
+#include "common/file.h"
+#include "common/fs.h"
+
+/**
+ * Flushes the data cache (Platform Specific).
+ */
+static void flushDataCache(void *ptr, uint32 len) {
+#ifdef __DS__
+	DC_FlushRange(ptr, len);
+	IC_InvalidateRange(ptr, len);
+#endif
+#ifdef __PLAYSTATION2__
+	(void) ptr;
+	(void) len;
+	FlushCache(0);
+	FlushCache(2);
+#endif
+#ifdef __PSP__
+	sceKernelDcacheWritebackRange(ptr, len);
+	sceKernelIcacheInvalidateRange(ptr, len);
+#endif
+#ifdef __WII__
+	DCFlushRange(ptr, len);
+	ICInvalidateRange(ptr, len);
+#endif
+}
+
+DLObject::DLObject() :
+	_segment(0),
+	_symtab(0),
+	_strtab(0),
+	_symbol_cnt(0),
+	_symtab_sect(-1),
+	_dtors_start(0),
+	_dtors_end(0),
+	_segmentSize(0),
+	_segmentOffset(0),
+	_segmentVMA(0) {
+}
+
+DLObject::~DLObject() {
+	unload();
+}
+
+// Expel the symbol table from memory
+void DLObject::discard_symtab() {
+	free(_symtab);
+	free(_strtab);
+	_symtab = 0;
+	_strtab = 0;
+	_symbol_cnt = 0;
+}
+
+// Unload all objects from memory
+void DLObject::unload() {
+	discard_symtab();
+	free(_segment);
+	_segment = 0;
+}
+
+bool DLObject::readElfHeader(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr) {
+	// Start reading the elf header. Check for errors and magic
+	if (DLFile->read(ehdr, sizeof(*ehdr)) != sizeof(*ehdr) ||
+			memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
+		warning("elfloader: No ELF file.");
+		return false;
+	}
+
+	if (ehdr->e_ident[EI_CLASS] != ELFCLASS32) {
+		warning("elfloader: Wrong ELF file class.");
+		return false;
+	}
+
+	if (ehdr->e_ident[EI_DATA] !=
+#ifdef SCUMM_BIG_ENDIAN
+			ELFDATA2MSB
+#else
+			ELFDATA2LSB
+#endif
+			) {
+		warning("elfloader: Wrong ELF file endianess.");
+		return false;
+	}
+
+	if (ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
+		warning("elfloader: Wrong ELF file version.");
+		return false;
+	}
+
+	if (ehdr->e_type != ET_EXEC) {
+		warning("elfloader: No executable ELF file.");
+		return false;
+	}
+
+	if (ehdr->e_machine !=
+#ifdef ARM_TARGET
+			EM_ARM
+#endif
+#ifdef MIPS_TARGET
+			EM_MIPS
+#endif
+#ifdef PPC_TARGET
+			EM_PPC
+#endif
+			) {
+		warning("elfloader: Wrong ELF file architecture.");
+		return false;
+	}
+
+	if (ehdr->e_phentsize < sizeof(Elf32_Phdr)	 ||			// Check for size of program header
+			ehdr->e_shentsize != sizeof(Elf32_Shdr)) {		// Check for size of section header
+		warning("elfloader: Invalid ELF structure sizes.");
+		return false;
+	}
+
+	debug(2, "elfloader: phoff = %d, phentsz = %d, phnum = %d",
+			ehdr->e_phoff, ehdr->e_phentsize, ehdr->e_phnum);
+
+	return true;
+}
+
+bool DLObject::readProgramHeaders(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Phdr *phdr, int num) {
+	// Read program header
+	if (!DLFile->seek(ehdr->e_phoff + sizeof(*phdr)*num, SEEK_SET) ||
+			DLFile->read(phdr, sizeof(*phdr)) != sizeof(*phdr)) {
+		warning("elfloader: Program header load failed.");
+		return false;
+	}
+
+	// Check program header values
+	if (phdr->p_type != PT_LOAD  || phdr->p_filesz > phdr->p_memsz) {
+		warning("elfloader: Invalid program header.");
+		return false;
+	}
+
+	debug(2, "elfloader: offs = %x, filesz = %x, memsz = %x, align = %x",
+			phdr->p_offset, phdr->p_filesz, phdr->p_memsz, phdr->p_align);
+
+	return true;
+}
+
+bool DLObject::loadSegment(Common::SeekableReadStream* DLFile, Elf32_Phdr *phdr) {
+	char *baseAddress = 0;
+
+	// Attempt to allocate memory for segment
+	int extra = phdr->p_vaddr % phdr->p_align;	// Get extra length TODO: check logic here
+	debug(2, "elfloader: Extra mem is %x", extra);
+
+	if (!(_segment = (char *)memalign(phdr->p_align, phdr->p_memsz + extra))) {
+		warning("elfloader: Out of memory.");
+		return false;
+	}
+
+	debug(2, "elfloader: Allocated segment @ %p", _segment);
+
+	// Get offset to load segment into
+	baseAddress = (char *)_segment;
+	_segmentSize = phdr->p_memsz + extra;
+	_segmentVMA = phdr->p_vaddr;
+
+	// Set bss segment to 0 if necessary (assumes bss is at the end)
+	if (phdr->p_memsz > phdr->p_filesz) {
+		debug(2, "elfloader: Setting %p to %p to 0 for bss", baseAddress + phdr->p_filesz, baseAddress + phdr->p_memsz);
+		memset(baseAddress + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
+	}
+
+	debug(2, "elfloader: Reading the segment into memory");
+
+	// Read the segment into memory
+	if (!DLFile->seek(phdr->p_offset, SEEK_SET) ||
+			DLFile->read(baseAddress, phdr->p_filesz) != phdr->p_filesz) {
+		warning("elfloader: Segment load failed.");
+		return false;
+	}
+
+	debug(2, "elfloader: Segment has been read into memory");
+
+	return true;
+}
+
+Elf32_Shdr * DLObject::loadSectionHeaders(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr) {
+	Elf32_Shdr *shdr = 0;
+
+	// Allocate memory for section headers
+	if (!(shdr = (Elf32_Shdr *)malloc(ehdr->e_shnum * sizeof(*shdr)))) {
+		warning("elfloader: Out of memory.");
+		return 0;
+	}
+
+	// Read from file into section headers
+	if (!DLFile->seek(ehdr->e_shoff, SEEK_SET) ||
+			DLFile->read(shdr, ehdr->e_shnum * sizeof(*shdr)) !=
+			ehdr->e_shnum * sizeof(*shdr)) {
+		warning("elfloader: Section headers load failed.");
+		return 0;
+	}
+
+	return shdr;
+}
+
+int DLObject::loadSymbolTable(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) {
+	// Loop over sections, looking for symbol table linked to a string table
+	for (int i = 0; i < ehdr->e_shnum; i++) {
+		if (shdr[i].sh_type == SHT_SYMTAB &&
+				shdr[i].sh_entsize == sizeof(Elf32_Sym) &&
+				shdr[i].sh_link < ehdr->e_shnum &&
+				shdr[shdr[i].sh_link].sh_type == SHT_STRTAB &&
+				_symtab_sect < 0) {
+			_symtab_sect = i;
+		}
+	}
+
+	// Check for no symbol table
+	if (_symtab_sect < 0) {
+		warning("elfloader: No symbol table.");
+		return -1;
+	}
+
+	debug(2, "elfloader: Symbol section at section %d, size %x", _symtab_sect, shdr[_symtab_sect].sh_size);
+
+	// Allocate memory for symbol table
+	if (!(_symtab = malloc(shdr[_symtab_sect].sh_size))) {
+		warning("elfloader: Out of memory.");
+		return -1;
+	}
+
+	// Read symbol table into memory
+	if (!DLFile->seek(shdr[_symtab_sect].sh_offset, SEEK_SET) ||
+			DLFile->read(_symtab, shdr[_symtab_sect].sh_size) !=
+			shdr[_symtab_sect].sh_size) {
+		warning("elfloader: Symbol table load failed.");
+		return -1;
+	}
+
+	// Set number of symbols
+	_symbol_cnt = shdr[_symtab_sect].sh_size / sizeof(Elf32_Sym);
+	debug(2, "elfloader: Loaded %d symbols.", _symbol_cnt);
+
+	return _symtab_sect;
+}
+
+bool DLObject::loadStringTable(Common::SeekableReadStream* DLFile, Elf32_Shdr *shdr) {
+	int string_sect = shdr[_symtab_sect].sh_link;
+
+	// Allocate memory for string table
+	if (!(_strtab = (char *)malloc(shdr[string_sect].sh_size))) {
+		warning("elfloader: Out of memory.");
+		return false;
+	}
+
+	// Read string table into memory
+	if (!DLFile->seek(shdr[string_sect].sh_offset, SEEK_SET) ||
+			DLFile->read(_strtab, shdr[string_sect].sh_size) !=
+			shdr[string_sect].sh_size) {
+		warning("elfloader: Symbol table strings load failed.");
+		return false;
+	}
+
+	return true;
+}
+
+void DLObject::relocateSymbols(ptrdiff_t offset) {
+	// Loop over symbols, add relocation offset
+	Elf32_Sym *s = (Elf32_Sym *)_symtab;
+	for (int c = _symbol_cnt; c--; s++) {
+		// Make sure we don't relocate special valued symbols
+		if (s->st_shndx < SHN_LOPROC) {
+				s->st_value += offset;
+				if (s->st_value < (Elf32_Addr)_segment || s->st_value > (Elf32_Addr)_segment + _segmentSize)
+					warning("elfloader: Symbol out of bounds! st_value = %x", s->st_value);
+		}
+	}
+}
+
+bool DLObject::load(Common::SeekableReadStream* DLFile) {
+	Elf32_Ehdr ehdr;
+	Elf32_Phdr phdr;
+	Elf32_Shdr *shdr;
+	bool ret = true;
+
+	if (readElfHeader(DLFile, &ehdr) == false) {
+		return false;
+	}
+
+	for (int i = 0; i < ehdr.e_phnum; i++) {	//Load our segments
+		debug(2, "elfloader: Loading segment %d", i);
+
+		if (readProgramHeaders(DLFile, &ehdr, &phdr, i) == false)
+			return false;
+
+		if (!loadSegment(DLFile, &phdr))
+			return false;
+	}
+
+	if ((shdr = loadSectionHeaders(DLFile, &ehdr)) == 0)
+		ret = false;
+
+	if (ret && ((_symtab_sect = loadSymbolTable(DLFile, &ehdr, shdr)) < 0))
+		ret = false;
+
+	if (ret && (loadStringTable(DLFile, shdr) == false))
+		ret = false;
+
+	if (ret) {
+		// Offset by our segment allocated address
+		_segmentOffset = ptrdiff_t(_segment) - phdr.p_vaddr;
+		relocateSymbols(_segmentOffset);
+	}
+
+	if (ret && (relocateRels(DLFile, &ehdr, shdr) == false))
+		ret = false;
+
+	free(shdr);
+
+	return ret;
+}
+
+bool DLObject::open(const char *path) {
+	Common::SeekableReadStream* DLFile;
+	void *ctors_start, *ctors_end;
+
+	debug(2, "elfloader: open(\"%s\")", path);
+
+	Common::FSNode file(path);
+
+	if (!(DLFile = file.createReadStream())) {
+		warning("elfloader: %s not found.", path);
+		return false;
+	}
+
+	debug(2, "elfloader: %s found!", path);
+
+	/*Try to load and relocate*/
+	if (!load(DLFile)) {
+		unload();
+		return false;
+	}
+
+	debug(2, "elfloader: Loaded!");
+
+	flushDataCache(_segment, _segmentSize);
+
+	ctors_start = symbol("___plugin_ctors");
+	ctors_end = symbol("___plugin_ctors_end");
+	_dtors_start = symbol("___plugin_dtors");
+	_dtors_end = symbol("___plugin_dtors_end");
+
+	if (!ctors_start || !ctors_end || !_dtors_start || !_dtors_end) {
+		warning("elfloader: Missing ctors/dtors.");
+		_dtors_start = _dtors_end = 0;
+		unload();
+		return false;
+	}
+
+	debug(2, "elfloader: Calling constructors.");
+	for (void (**f)(void) = (void (**)(void))ctors_start; f != ctors_end; f++)
+		(**f)();
+
+	debug(2, "elfloader: %s opened ok.", path);
+
+	return true;
+}
+
+bool DLObject::close() {
+	if (_dtors_start && _dtors_end)
+		for (void (**f)(void) = (void (**)(void))_dtors_start; f != _dtors_end; f++)
+			(**f)();
+	_dtors_start = _dtors_end = 0;
+	unload();
+	return true;
+}
+
+void *DLObject::symbol(const char *name) {
+	debug(2, "elfloader: Symbol(\"%s\")", name);
+
+	if (!_symtab || !_strtab || _symbol_cnt < 1) {
+		warning("elfloader: No symbol table loaded.");
+		return 0;
+	}
+
+	Elf32_Sym *s = (Elf32_Sym *)_symtab;
+	for (int c = _symbol_cnt; c--; s++)
+		// We can only import symbols that are global or weak in the plugin
+		if ((SYM_BIND(s->st_info) == STB_GLOBAL ||
+				SYM_BIND(s->st_info) == STB_WEAK) &&
+				!strcmp(name, _strtab + s->st_name)) {
+			// We found the symbol
+			debug(2, "elfloader: => %p", (void*)s->st_value);
+			return (void*)s->st_value;
+		}
+
+	// We didn't find the symbol
+	warning("elfloader: Symbol \"%s\" not found.", name);
+	return 0;
+}
+
+#endif /* defined(DYNAMIC_MODULES) && defined(ELF_LOADER_TARGET) */
+
diff --git a/backends/plugins/elf/elf-loader.h b/backends/plugins/elf/elf-loader.h
new file mode 100644
index 0000000000..6413c46cea
--- /dev/null
+++ b/backends/plugins/elf/elf-loader.h
@@ -0,0 +1,83 @@
+/* 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(ELF_LOADER_TARGET)
+
+#ifndef ELF_LOADER_H
+#define ELF_LOADER_H
+
+#include <stddef.h>
+
+#include "backends/plugins/elf/elf32.h"
+#include "backends/plugins/dynamic-plugin.h"
+
+#include "common/stream.h"
+
+/**
+ * DLObject
+ *
+ * Class that most directly handles operations on a plugin file
+ * (opening it for reading, loading/unloading it in memory, finding a specific symbol in the file, etc.)
+ * Subclasses have the same functionality, but implementations specific to different processors/platforms.
+ */
+class DLObject {
+protected:
+	void *_segment, *_symtab;
+	char *_strtab;
+	int _symbol_cnt;
+	int _symtab_sect;
+	void *_dtors_start, *_dtors_end;
+
+	uint32 _segmentSize;
+	ptrdiff_t _segmentOffset;
+	uint32 _segmentVMA;
+
+	virtual void unload();
+	bool load(Common::SeekableReadStream* DLFile);
+
+	bool readElfHeader(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr);
+	bool readProgramHeaders(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Phdr *phdr, int num);
+	virtual bool loadSegment(Common::SeekableReadStream* DLFile, Elf32_Phdr *phdr);
+	Elf32_Shdr *loadSectionHeaders(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr);
+	int loadSymbolTable(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr);
+	bool loadStringTable(Common::SeekableReadStream* DLFile, Elf32_Shdr *shdr);
+	virtual void relocateSymbols(ptrdiff_t offset);
+
+	virtual bool relocate(Common::SeekableReadStream* DLFile, unsigned long offset, unsigned long size, void *relSegment) = 0;
+	virtual bool relocateRels(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) = 0;
+
+public:
+	DLObject();
+	virtual ~DLObject();
+
+	bool open(const char *path);
+	bool close();
+	void *symbol(const char *name);
+	void discard_symtab();
+};
+
+#endif /* ELF_LOADER_H */
+
+#endif /* defined(DYNAMIC_MODULES) && defined(ELF_LOADER_TARGET) */
diff --git a/backends/plugins/elf/elf-provider.cpp b/backends/plugins/elf/elf-provider.cpp
new file mode 100644
index 0000000000..9b42d4edd3
--- /dev/null
+++ b/backends/plugins/elf/elf-provider.cpp
@@ -0,0 +1,99 @@
+/* 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(ELF_LOADER_TARGET)
+
+#include "backends/plugins/elf/elf-provider.h"
+#include "backends/plugins/dynamic-plugin.h"
+
+#include "common/fs.h"
+
+DynamicPlugin::VoidFunc ELFPlugin::findSymbol(const char *symbol) {
+	void *func = 0;
+
+	if (_dlHandle)
+		func = _dlHandle->symbol(symbol);
+
+	if (!func) {
+		if (!_dlHandle)
+			warning("elfloader: Failed loading symbol '%s' from plugin '%s' (Handle is NULL)", symbol, _filename.c_str());
+		else
+			warning("elfloader: Failed loading symbol '%s' from plugin '%s'", symbol, _filename.c_str());
+	}
+
+	// FIXME HACK: This is a HACK to circumvent a clash between the ISO C++
+	// standard and POSIX: ISO C++ disallows casting between function pointers
+	// and data pointers, but dlsym always returns a void pointer. For details,
+	// see e.g. <http://www.trilithium.com/johan/2004/12/problem-with-dlsym/>.
+	assert(sizeof(VoidFunc) == sizeof(func));
+	VoidFunc tmp;
+	memcpy(&tmp, &func, sizeof(VoidFunc));
+	return tmp;
+}
+
+bool ELFPlugin::loadPlugin() {
+	assert(!_dlHandle);
+	DLObject *obj = makeDLObject();
+	if (obj->open(_filename.c_str())) {
+		_dlHandle = obj;
+	} else {
+		delete obj;
+		_dlHandle = 0;
+	}
+
+	if (!_dlHandle) {
+		warning("elfloader: Failed loading plugin '%s'", _filename.c_str());
+		return false;
+	}
+
+	bool ret = DynamicPlugin::loadPlugin();
+
+	if (ret && _dlHandle)
+		_dlHandle->discard_symtab();
+
+	return ret;
+}
+
+void ELFPlugin::unloadPlugin() {
+	DynamicPlugin::unloadPlugin();
+	if (_dlHandle) {
+		if (!_dlHandle->close()) {
+			warning("elfloader: Failed unloading plugin '%s'", _filename.c_str());
+		}
+		delete _dlHandle;
+		_dlHandle = 0;
+	}
+}
+
+bool ELFPluginProvider::isPluginFilename(const Common::FSNode &node) const {
+	// Check the plugin suffix
+	Common::String filename = node.getName();
+	if (!filename.hasSuffix(".PLG") && !filename.hasSuffix(".plg") && !filename.hasSuffix(".PLUGIN") && !filename.hasSuffix(".plugin"))
+		return false;
+
+	return true;
+}
+
+#endif // defined(DYNAMIC_MODULES) && defined(ELF_LOADER_TARGET)
diff --git a/backends/plugins/elf/elf-provider.h b/backends/plugins/elf/elf-provider.h
new file mode 100644
index 0000000000..f06621f5b7
--- /dev/null
+++ b/backends/plugins/elf/elf-provider.h
@@ -0,0 +1,75 @@
+/* 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(ELF_LOADER_TARGET)
+
+#ifndef BACKENDS_PLUGINS_ELF_PROVIDER_H
+#define BACKENDS_PLUGINS_ELF_PROVIDER_H
+
+#include "backends/plugins/elf/elf-loader.h"
+
+#include "common/fs.h"
+
+/**
+ * ELFPlugin
+ *
+ * Objects of this class are returned when the PluginManager calls
+ * getPlugins() on an ELFPluginProvider. An intermediary class for
+ * dealing with plugin files, ELFPlugin is responsible for creating/destroying
+ * a DLObject that handles the opening/loading/unloading of the plugin file whose
+ * path in the target backend's file system is "_filename".
+ */
+class ELFPlugin : public DynamicPlugin {
+protected:
+	DLObject *_dlHandle;
+	Common::String _filename;
+
+	virtual VoidFunc findSymbol(const char *symbol);
+
+public:
+	ELFPlugin(const Common::String &filename)
+		: _dlHandle(0), _filename(filename) {}
+
+	~ELFPlugin() {
+		if (_dlHandle)
+			unloadPlugin();
+	}
+
+	virtual DLObject *makeDLObject() = 0;
+
+	bool loadPlugin();
+	void unloadPlugin();
+};
+
+class ELFPluginProvider : public FilePluginProvider {
+protected:
+	virtual Plugin* createPlugin(const Common::FSNode &node) const = 0;
+
+	bool isPluginFilename(const Common::FSNode &node) const;
+};
+
+#endif /* BACKENDS_PLUGINS_ELF_PROVIDER_H */
+
+#endif // defined(DYNAMIC_MODULES) && defined(ELF_LOADER_TARGET)
diff --git a/backends/plugins/elf/elf32.h b/backends/plugins/elf/elf32.h
new file mode 100644
index 0000000000..c83093fed7
--- /dev/null
+++ b/backends/plugins/elf/elf32.h
@@ -0,0 +1,252 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef BACKENDS_ELF_H
+#define BACKENDS_ELF_H
+
+/**
+ *  ELF stuff:
+ *  The contents of this file were gathered mainly from the SYSTEM V APPLICATION BINARY INTERFACE.
+ *  Processor-specific things were garnered from processor-specific supplements to the abi.
+ */
+
+typedef unsigned short Elf32_Half, Elf32_Section;
+typedef unsigned int Elf32_Word, Elf32_Addr, Elf32_Off;
+typedef signed int  Elf32_Sword;
+typedef Elf32_Half Elf32_Versym;
+
+#define EI_NIDENT (16)
+#define SELFMAG   4
+
+/* ELF File format structures. Look up ELF structure for more details */
+
+// ELF header (contains info about the file)
+typedef struct {
+	unsigned char e_ident[EI_NIDENT];     /* Magic number and other info */
+	Elf32_Half    e_type;                 /* Object file type */
+	Elf32_Half    e_machine;              /* Architecture */
+	Elf32_Word    e_version;              /* Object file version */
+	Elf32_Addr    e_entry;                /* Entry point virtual address */
+	Elf32_Off     e_phoff;                /* Program header table file offset */
+	Elf32_Off     e_shoff;                /* Section header table file offset */
+	Elf32_Word    e_flags;                /* Processor-specific flags */
+	Elf32_Half    e_ehsize;               /* ELF header size in bytes */
+	Elf32_Half    e_phentsize;            /* Program header table entry size */
+	Elf32_Half    e_phnum;                /* Program header table entry count */
+	Elf32_Half    e_shentsize;            /* Section header table entry size */
+	Elf32_Half    e_shnum;                /* Section header table entry count */
+	Elf32_Half    e_shstrndx;             /* Section header string table index */
+} Elf32_Ehdr;
+
+// Should be in e_ident
+#define ELFMAG		"\177ELF"	/* ELF Magic number */
+
+#define EI_CLASS	4		/* File class byte index */
+#define ELFCLASS32	1		/* 32-bit objects */
+
+#define EI_DATA		5		/* Data encoding byte index */
+#define ELFDATA2LSB	1		/* 2's complement, little endian */
+#define ELFDATA2MSB	2		/* 2's complement, big endian */
+
+#define EI_VERSION	6
+#define EV_CURRENT	1		/* Current version */
+
+// e_type values
+#define ET_NONE		0	/* no file type */
+#define ET_REL		1	/* relocatable */
+#define ET_EXEC		2	/* executable */
+#define ET_DYN		3	/* shared object */
+#define ET_CORE		4	/* core file */
+
+// e_machine values
+#define EM_MIPS		8
+#define EM_PPC		20
+#define EM_ARM		40
+
+// Program header (contains info about segment)
+typedef struct {
+	Elf32_Word    p_type;                 /* Segment type */
+	Elf32_Off     p_offset;               /* Segment file offset */
+	Elf32_Addr    p_vaddr;                /* Segment virtual address */
+	Elf32_Addr    p_paddr;                /* Segment physical address */
+	Elf32_Word    p_filesz;               /* Segment size in file */
+	Elf32_Word    p_memsz;                /* Segment size in memory */
+	Elf32_Word    p_flags;                /* Segment flags */
+	Elf32_Word    p_align;                /* Segment alignment */
+} Elf32_Phdr;
+
+// p_type values
+#define PT_NULL 		0	/* ignored */
+#define PT_LOAD			1	/* loadable segment */
+#define PT_DYNAMIC		2	/* dynamic linking info */
+#define PT_INTERP		3	/* info about interpreter */
+#define PT_NOTE			4	/* note segment */
+#define PT_SHLIB		5	/* reserved */
+#define PT_PHDR			6	/* Program header table */
+#define PT_MIPS_REGINFO 0x70000000 /* Register usage info for MIPS */
+#define PT_ARM_ARCHEXT 	0x70000000 /* Platform architecture compatibility info for ARM */
+#define PT_ARM_EXIDX 	0x70000001 /* Exception unwind tables for ARM */
+
+// p_flags value
+#define PF_X	1	/* execute */
+#define PF_W	2	/* write */
+#define PF_R	4	/* read */
+
+// Section header (contains info about section)
+typedef struct {
+	Elf32_Word    sh_name;                /* Section name (string tbl index) */
+	Elf32_Word    sh_type;                /* Section type */
+	Elf32_Word    sh_flags;               /* Section flags */
+	Elf32_Addr    sh_addr;                /* Section virtual addr at execution */
+	Elf32_Off     sh_offset;              /* Section file offset */
+	Elf32_Word    sh_size;                /* Section size in bytes */
+	Elf32_Word    sh_link;                /* Link to another section */
+	Elf32_Word    sh_info;                /* Additional section information */
+	Elf32_Word    sh_addralign;           /* Section alignment */
+	Elf32_Word    sh_entsize;             /* Entry size if section holds table */
+} Elf32_Shdr;
+
+// sh_type values
+#define SHT_NULL			0	/* Inactive section */
+#define SHT_PROGBITS		1	/* Proprietary */
+#define SHT_SYMTAB			2	/* Symbol table */
+#define SHT_STRTAB			3	/* String table */
+#define SHT_RELA			4	/* Relocation entries with addend */
+#define SHT_HASH			5	/* Symbol hash table */
+#define SHT_DYNAMIC			6	/* Info for dynamic linking */
+#define SHT_NOTE			7	/* Note section */
+#define SHT_NOBITS			8	/* Occupies no space */
+#define SHT_REL				9	/* Relocation entries without addend */
+#define SHT_SHLIB			10	/* Reserved */
+#define SHT_DYNSYM			11	/* Minimal set of dynamic linking symbols */
+#define SHT_MIPS_LIBLSIT	0x70000000	/* Info about dynamic shared object libs for MIPS*/
+#define SHT_MIPS_CONFLICT	0x70000002	/* Conflicts btw executables and shared objects for MIPS */
+#define SHT_MIPS_GPTAB		0x70000003	/* Global pointer table for MIPS*/
+#define SHT_ARM_EXIDX		0x70000001	/* Exception Index table for ARM*/
+#define SHT_ARM_PREEMPTMAP	0x70000002	/* BPABI DLL dynamic linking pre-emption map for ARM */
+#define SHT_ARM_ATTRIBUTES	0x70000003	/* Object file compatibility attributes for ARM*/
+
+// sh_flags values
+#define SHF_WRITE		0	/* writable section */
+#define SHF_ALLOC		2	/* section occupies memory */
+#define SHF_EXECINSTR	4	/* machine instructions */
+#define SHF_MIPS_GPREL	0x10000000	/* Must be made part of global data area for MIPS */
+
+// Symbol entry (contain info about a symbol)
+typedef struct {
+	Elf32_Word    st_name;                /* Symbol name (string tbl index) */
+	Elf32_Addr    st_value;               /* Symbol value */
+	Elf32_Word    st_size;                /* Symbol size */
+	unsigned char st_info;                /* Symbol type and binding */
+	unsigned char st_other;               /* Symbol visibility */
+	Elf32_Section st_shndx;               /* Section index */
+} Elf32_Sym;
+
+// Extract from the st_info
+#define SYM_TYPE(x)		((x)&0xF)
+#define SYM_BIND(x)		((x)>>4)
+
+// Symbol binding values from st_info
+#define STB_LOCAL	0	/* Symbol not visible outside object */
+#define STB_GLOBAL	1	/* Symbol visible to all object files */
+#define STB_WEAK	2	/* Similar to STB_GLOBAL */
+
+// Symbol type values from st_info
+#define STT_NOTYPE	0	/* Not specified */
+#define STT_OBJECT	1	/* Data object e.g. variable */
+#define STT_FUNC	2	/* Function */
+#define STT_SECTION	3	/* Section */
+#define STT_FILE	4	/* Source file associated with object file */
+
+// Special section header index values from st_shndex
+#define SHN_UNDEF		0
+#define SHN_LOPROC		0xFF00	/* Extended values */
+#define SHN_ABS			0xFFF1	/* Absolute value: don't relocate */
+#define SHN_COMMON		0xFFF2	/* Common block. Not allocated yet */
+#define SHN_HIPROC		0xFF1F
+#define SHN_HIRESERVE	0xFFFF
+
+// Relocation entry with implicit addend (info about how to relocate)
+typedef struct {
+	Elf32_Addr    r_offset;               /* Address */
+	Elf32_Word    r_info;                 /* Relocation type and symbol index */
+} Elf32_Rel;
+
+// Relocation entry with explicit addend (info about how to relocate)
+typedef struct
+{
+  Elf32_Addr    r_offset;               /* Address */
+  Elf32_Word    r_info;                 /* Relocation type and symbol index */
+  Elf32_Sword   r_addend;               /* Addend */
+} Elf32_Rela;
+
+// Access macros for the relocation info
+#define REL_TYPE(x)		((unsigned char) (x))	/* Extract relocation type */
+#define REL_INDEX(x)	((x)>>8)		/* Extract relocation index into symbol table */
+
+//MIPS relocation types
+#define R_MIPS_NONE		0
+#define R_MIPS_16		1
+#define R_MIPS_32		2
+#define R_MIPS_REL32	3
+#define R_MIPS_26		4
+#define R_MIPS_HI16		5
+#define R_MIPS_LO16		6
+#define R_MIPS_GPREL16	7
+#define R_MIPS_LITERAL	8
+#define R_MIPS_GOT16	9
+#define R_MIPS_PC16		10
+#define R_MIPS_CALL16	11
+#define R_MIPS_GPREL32	12
+#define R_MIPS_GOTHI16	13
+#define R_MIPS_GOTLO16	14
+#define R_MIPS_CALLHI16	15
+#define R_MIPS_CALLLO16	16
+
+// ARM relocation types
+#define R_ARM_NONE			0
+#define R_ARM_ABS32			2
+#define R_ARM_THM_CALL		10
+#define R_ARM_CALL			28
+#define R_ARM_JUMP24		29
+#define R_ARM_TARGET1		38
+#define R_ARM_V4BX 			40
+
+// PPC relocation types
+#define R_PPC_ADDR32		1
+#define R_PPC_ADDR16_LO		4
+#define R_PPC_ADDR16_HI		5
+#define R_PPC_ADDR16_HA		6
+#define R_PPC_REL24			10
+#define R_PPC_REL32			26
+
+// Mock function to get value of global pointer for MIPS
+#define getGP()	({	\
+	unsigned int __valgp;	\
+	__asm__ ("add %0, $gp, $0" : "=r"(__valgp) : ); \
+	__valgp; \
+})
+
+#endif /* BACKENDS_ELF_H */
diff --git a/backends/plugins/elf/mips-loader.cpp b/backends/plugins/elf/mips-loader.cpp
new file mode 100644
index 0000000000..642ea0427a
--- /dev/null
+++ b/backends/plugins/elf/mips-loader.cpp
@@ -0,0 +1,334 @@
+/* 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 "backends/plugins/elf/mips-loader.h"
+
+#include "common/debug.h"
+
+/**
+ * Follow the instruction of a relocation section.
+ *
+ * @param DLFile		SeekableReadStream of File
+ * @param fileOffset	Offset into the File
+ * @param size			Size of relocation section
+ * @param relSegment	Base address of relocated segment in memory (memory offset)
+ */
+bool MIPSDLObject::relocate(Common::SeekableReadStream* DLFile, unsigned long offset, unsigned long size, void *relSegment) {
+	Elf32_Rel *rel = 0;	// relocation entry
+
+	// Allocate memory for relocation table
+	if (!(rel = (Elf32_Rel *)malloc(size))) {
+		warning("elfloader: Out of memory.");
+		return false;
+	}
+
+	// Read in our relocation table
+	if (!DLFile->seek(offset, SEEK_SET) ||
+			DLFile->read(rel, size) != size) {
+		warning("elfloader: Relocation table load failed.");
+		free(rel);
+		return false;
+	}
+
+	// Treat each relocation entry. Loop over all of them
+	int cnt = size / sizeof(*rel);
+
+	debug(2, "elfloader: Loaded relocation table. %d entries. base address=%p", cnt, relSegment);
+
+	bool seenHi16 = false;	// For treating HI/LO16 commands
+	int firstHi16 = -1;		// Mark the point of the first hi16 seen
+	Elf32_Addr ahl = 0;		// Calculated addend
+	int a = 0;				// Addend: taken from the target
+
+	unsigned int *lastTarget = 0;	// For processing hi16 when lo16 arrives
+	unsigned int relocation = 0;
+	int debugRelocs[10] = {0};		// For debugging
+	int extendedHi16 = 0;			// Count extended hi16 treatments
+	Elf32_Addr lastHiSymVal = 0;
+	bool hi16InShorts = false;
+
+#define DEBUG_NUM 2
+
+	// Loop over relocation entries
+	for (int i = 0; i < cnt; i++) {
+		// Get the symbol this relocation entry is referring to
+		Elf32_Sym *sym = (Elf32_Sym *)(_symtab) + (REL_INDEX(rel[i].r_info));
+
+		// Get the target instruction in the code
+		unsigned int *target = (unsigned int *)((char *)relSegment + rel[i].r_offset);
+
+		unsigned int origTarget = *target;	// Save for debugging
+
+		// Act differently based on the type of relocation
+		switch (REL_TYPE(rel[i].r_info)) {
+		case R_MIPS_HI16:						// Absolute addressing.
+			if (sym->st_shndx < SHN_LOPROC &&		// Only shift for plugin section (ie. has a real section index)
+				firstHi16 < 0) {				// Only process first in block of HI16s
+				firstHi16 = i;						// Keep the first Hi16 we saw
+				seenHi16 = true;
+				ahl = (*target & 0xffff) << 16;		// Take lower 16 bits shifted up
+
+				lastHiSymVal = sym->st_value;
+				hi16InShorts = (ShortsMan.inGeneralSegment((char *)sym->st_value)); // Fix for problem with switching btw segments
+				if (debugRelocs[0]++ < DEBUG_NUM)	// Print only a set number
+					debug(8, "elfloader: R_MIPS_HI16: i=%d, offset=%x, ahl = %x, target = %x",
+							i, rel[i].r_offset, ahl, *target);
+			}
+			break;
+
+		case R_MIPS_LO16:						// Absolute addressing. Needs a HI16 to come before it
+			if (sym->st_shndx < SHN_LOPROC) {		// Only shift for plugin section. (ie. has a real section index)
+				if (!seenHi16) {					// We MUST have seen HI16 first
+					debug(8, "elfloader: R_MIPS_LO16 w/o preceding R_MIPS_HI16 at relocation %d!", i);
+					free(rel);
+					return false;
+				}
+
+				// Fix: bug in gcc makes LO16s connect to wrong HI16s sometimes (shorts and regular segment)
+				// Note that we can check the entire shorts segment because the executable's shorts don't belong to this plugin section
+				//	and will be screened out above
+				bool lo16InShorts = ShortsMan.inGeneralSegment((char *)sym->st_value);
+
+				// Correct the bug by getting the proper value in ahl (taken from the current symbol)
+				if ((hi16InShorts && !lo16InShorts) || (!hi16InShorts && lo16InShorts)) {
+					ahl -= (lastHiSymVal & 0xffff0000);		// We assume gcc meant the same offset
+					ahl += (sym->st_value & 0xffff0000);
+				}
+
+				ahl &= 0xffff0000;				// Clean lower 16 bits for repeated LO16s
+				a = *target & 0xffff;			// Take lower 16 bits of the target
+				a = (a << 16) >> 16;			// Sign extend them
+				ahl += a;						// Add lower 16 bits. AHL is now complete
+
+				// Fix: we can have LO16 access to the short segment sometimes
+				if (lo16InShorts)
+					relocation = ahl + _shortsSegment->getOffset();		// Add in the short segment offset
+				else	// It's in the regular segment
+					relocation = ahl + (Elf32_Addr)_segment;			// Add in the new offset for the segment
+
+				if (firstHi16 >= 0) {					// We haven't treated the HI16s yet so do it now
+					for (int j = firstHi16; j < i; j++) {
+						if (REL_TYPE(rel[j].r_info) != R_MIPS_HI16) continue;	// Skip over non-Hi16s
+
+						lastTarget = (unsigned int *)((char *)relSegment + rel[j].r_offset);	// get hi16 target
+						*lastTarget &= 0xffff0000;		// Clear the lower 16 bits of the last target
+						*lastTarget |= (relocation >> 16) & 0xffff;	// Take the upper 16 bits of the relocation
+						if (relocation & 0x8000)
+							(*lastTarget)++;	// Subtle: we need to add 1 to the HI16 in this case
+					}
+					firstHi16 = -1;						// Reset so we'll know we treated it
+				} else {
+					extendedHi16++;
+				}
+
+				*target &= 0xffff0000;						// Clear the lower 16 bits of current target
+				*target |= relocation & 0xffff;				// Take the lower 16 bits of the relocation
+
+				if (debugRelocs[1]++ < DEBUG_NUM)
+					debug(8, "elfloader: R_MIPS_LO16: i=%d, offset=%x, a=%x, ahl = %x, lastTarget = %x, origt = %x, target = %x",
+							i, rel[i].r_offset, a, ahl, *lastTarget, origTarget, *target);
+				if (lo16InShorts && debugRelocs[2]++ < DEBUG_NUM)
+					debug(8, "elfloader: R_MIPS_LO16s: i=%d, offset=%x, a=%x, ahl = %x, lastTarget = %x, origt = %x, target = %x",
+							i, rel[i].r_offset, a, ahl, *lastTarget, origTarget, *target);
+			}
+			break;
+
+		case R_MIPS_26:									// Absolute addressing (for jumps and branches only)
+			if (sym->st_shndx < SHN_LOPROC) {			// Only relocate for main segment
+				a = *target & 0x03ffffff;				// Get 26 bits' worth of the addend
+				a = (a << 6) >> 6; 							// Sign extend a
+				relocation = ((a << 2) + (Elf32_Addr)_segment) >> 2;	// a already points to the target. Subtract our offset
+				*target &= 0xfc000000;					// Clean lower 26 target bits
+				*target |= (relocation & 0x03ffffff);
+
+				if (debugRelocs[3]++ < DEBUG_NUM)
+					debug(8, "elfloader: R_MIPS_26: i=%d, offset=%x, symbol=%d, stinfo=%x, a=%x, origTarget=%x, target=%x",
+							i, rel[i].r_offset, REL_INDEX(rel[i].r_info), sym->st_info, a, origTarget, *target);
+			} else {
+				if (debugRelocs[4]++ < DEBUG_NUM)
+					debug(8, "elfloader: R_MIPS_26: i=%d, offset=%x, symbol=%d, stinfo=%x, a=%x, origTarget=%x, target=%x",
+							i, rel[i].r_offset, REL_INDEX(rel[i].r_info), sym->st_info, a, origTarget, *target);
+			}
+			break;
+
+		case R_MIPS_GPREL16:							// GP Relative addressing
+			if (_shortsSegment->getOffset() != 0 && 	// Only relocate if we shift the shorts section
+					ShortsMan.inGeneralSegment((char *)sym->st_value)) {	// Only relocate things in the plugin hole
+				a = *target & 0xffff;				    // Get 16 bits' worth of the addend
+				a = (a << 16) >> 16;						// Sign extend it
+
+				relocation = a + _shortsSegment->getOffset();
+
+				*target &= 0xffff0000;					// Clear the lower 16 bits of the target
+				*target |= relocation & 0xffff;
+
+				if (debugRelocs[5]++ < DEBUG_NUM)
+					debug(8, "elfloader: R_MIPS_GPREL16: i=%d, a=%x, gpVal=%x, origTarget=%x, target=%x, offset=%x",
+							i, a, _gpVal, origTarget, *target, _shortsSegment->getOffset());
+			}
+
+			break;
+
+		case R_MIPS_32:									// Absolute addressing
+			if (sym->st_shndx < SHN_LOPROC) {			// Only shift for plugin section.
+				a = *target;							// Get full 32 bits of addend
+
+				if (ShortsMan.inGeneralSegment((char *)sym->st_value)) // Check if we're in the shorts segment
+					relocation = a + _shortsSegment->getOffset();	   // Shift by shorts offset
+				else												   // We're in the main section
+					relocation = a + (Elf32_Addr)_segment;			   // Shift by main offset
+				*target = relocation;
+
+				if (debugRelocs[6]++ < DEBUG_NUM)
+					debug("8, elfloader: R_MIPS_32: i=%d, a=%x, origTarget=%x, target=%x", i, a, origTarget, *target);
+			}
+			break;
+
+		default:
+			warning("elfloader: Unknown relocation type %x at relocation %d.", REL_TYPE(rel[i].r_info), i);
+			free(rel);
+			return false;
+		}
+	}
+
+	debug(2, "elfloader: Done with relocation. extendedHi16=%d", extendedHi16);
+
+	free(rel);
+	return true;
+}
+
+bool MIPSDLObject::relocateRels(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) {
+	// Loop over sections, finding relocation sections
+	for (int i = 0; i < ehdr->e_shnum; i++) {
+
+		Elf32_Shdr *curShdr = &(shdr[i]);
+		//Elf32_Shdr *linkShdr = &(shdr[curShdr->sh_info]);
+
+		if (curShdr->sh_type == SHT_REL && 						// Check for a relocation section
+				curShdr->sh_entsize == sizeof(Elf32_Rel) &&		    // Check for proper relocation size
+				(int)curShdr->sh_link == _symtab_sect &&			// Check that the sh_link connects to our symbol table
+				curShdr->sh_info < ehdr->e_shnum &&					// Check that the relocated section exists
+				(shdr[curShdr->sh_info].sh_flags & SHF_ALLOC)) {  	// Check if relocated section resides in memory
+			if (!ShortsMan.inGeneralSegment((char *)shdr[curShdr->sh_info].sh_addr)) {			// regular segment
+				if (!relocate(DLFile, curShdr->sh_offset, curShdr->sh_size, _segment))
+					return false;
+			} else { 	// In Shorts segment
+				if (!relocate(DLFile, curShdr->sh_offset, curShdr->sh_size, (void *)_shortsSegment->getOffset()))
+					return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+void MIPSDLObject::relocateSymbols(Elf32_Addr offset) {
+	int mainCount = 0;
+	int shortsCount= 0;
+
+	// Loop over symbols, add relocation offset
+	Elf32_Sym *s = (Elf32_Sym *)_symtab;
+	for (int c = _symbol_cnt; c--; s++) {
+		// Make sure we don't relocate special valued symbols
+		if (s->st_shndx < SHN_LOPROC) {
+			if (!ShortsMan.inGeneralSegment((char *)s->st_value)) {
+				mainCount++;
+				s->st_value += offset;
+				if (s->st_value < (Elf32_Addr)_segment || s->st_value > (Elf32_Addr)_segment + _segmentSize)
+					warning("elfloader: Symbol out of bounds! st_value = %x", s->st_value);
+			} else {	// shorts section
+				shortsCount++;
+				s->st_value += _shortsSegment->getOffset();
+				if (!_shortsSegment->inSegment((char *)s->st_value))
+					warning("elfloader: Symbol out of bounds! st_value = %x", s->st_value);
+			}
+		}
+	}
+}
+
+bool MIPSDLObject::loadSegment(Common::SeekableReadStream* DLFile, Elf32_Phdr *phdr) {
+	char *baseAddress = 0;
+
+	// We need to take account of non-allocated segment for shorts
+	if (phdr->p_flags & PF_X) {	// This is a relocated segment
+		// Attempt to allocate memory for segment
+		int extra = phdr->p_vaddr % phdr->p_align;	// Get extra length TODO: check logic here
+		debug(2, "elfloader: Extra mem is %x", extra);
+
+		if (phdr->p_align < 0x10000)
+			phdr->p_align = 0x10000;	// Fix for wrong alignment on e.g. AGI
+
+		if (!(_segment = (char *)memalign(phdr->p_align, phdr->p_memsz + extra))) {
+			warning("elfloader: Out of memory.");
+			return false;
+		}
+		debug(2, "elfloader: Allocated segment @ %p", _segment);
+
+		// Get offset to load segment into
+		baseAddress = (char *)_segment + phdr->p_vaddr;
+		_segmentSize = phdr->p_memsz + extra;
+	} else {						// This is a shorts section.
+		_shortsSegment = ShortsMan.newSegment(phdr->p_memsz, (char *)phdr->p_vaddr);
+
+		baseAddress = _shortsSegment->getStart();
+		debug(2, "elfloader: Shorts segment @ %p to %p. Segment wants to be at %x. Offset=%x",
+				_shortsSegment->getStart(), _shortsSegment->getEnd(), phdr->p_vaddr, _shortsSegment->getOffset());
+	}
+
+	// Set bss segment to 0 if necessary (assumes bss is at the end)
+	if (phdr->p_memsz > phdr->p_filesz) {
+		debug(2, "elfloader: Setting %p to %p to 0 for bss", baseAddress + phdr->p_filesz, baseAddress + phdr->p_memsz);
+		memset(baseAddress + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
+	}
+
+	debug(2, "elfloader: Reading the segment into memory");
+
+	// Read the segment into memory
+	if (!DLFile->seek(phdr->p_offset, SEEK_SET) ||
+			DLFile->read(baseAddress, phdr->p_filesz) != phdr->p_filesz) {
+		warning("elfloader: Segment load failed.");
+		return false;
+	}
+
+	debug(2, "elfloader: Segment has been read into memory");
+
+	return true;
+}
+
+// Unload all objects from memory
+void MIPSDLObject::unload() {
+	discard_symtab();
+	free(_segment);
+	_segment = 0;
+
+	if (_shortsSegment) {
+		ShortsMan.deleteSegment(_shortsSegment);
+		_shortsSegment = 0;
+	}
+}
+
+#endif /* defined(DYNAMIC_MODULES) && defined(MIPS_TARGET) */
diff --git a/backends/plugins/elf/mips-loader.h b/backends/plugins/elf/mips-loader.h
new file mode 100644
index 0000000000..a3210b5b12
--- /dev/null
+++ b/backends/plugins/elf/mips-loader.h
@@ -0,0 +1,50 @@
+
+/* 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 "backends/plugins/elf/elf-loader.h"
+#include "backends/plugins/elf/shorts-segment-manager.h"
+
+class MIPSDLObject : public DLObject {
+protected:
+	ShortSegmentManager::Segment *_shortsSegment;			// For assigning shorts ranges
+	unsigned int _gpVal;									// Value of Global Pointer
+
+	virtual bool relocate(Common::SeekableReadStream* DLFile, unsigned long offset, unsigned long size, void *relSegment);
+	virtual bool relocateRels(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr);
+	virtual void relocateSymbols(Elf32_Addr offset);
+	virtual bool loadSegment(Common::SeekableReadStream* DLFile, Elf32_Phdr *phdr);
+	virtual void unload();
+
+public:
+    MIPSDLObject() : DLObject() {
+		_shortsSegment = NULL;
+		_gpVal = 0;
+    }
+};
+
+#endif /* defined(DYNAMIC_MODULES) && defined(MIPS_TARGET) */
diff --git a/backends/plugins/elf/plugin.syms b/backends/plugins/elf/plugin.syms
new file mode 100644
index 0000000000..24ee1a19dc
--- /dev/null
+++ b/backends/plugins/elf/plugin.syms
@@ -0,0 +1,8 @@
+PLUGIN_getVersion
+PLUGIN_getType
+PLUGIN_getTypeVersion
+PLUGIN_getObject
+___plugin_ctors
+___plugin_ctors_end
+___plugin_dtors
+___plugin_dtors_end
diff --git a/backends/plugins/elf/ppc-loader.cpp b/backends/plugins/elf/ppc-loader.cpp
new file mode 100644
index 0000000000..21a9a6c8a0
--- /dev/null
+++ b/backends/plugins/elf/ppc-loader.cpp
@@ -0,0 +1,128 @@
+/* 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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/branches/gsoc2010-plugins/backends/plugins/arm-loader.cpp $
+ * $Id: arm-loader.cpp 52058 2010-08-13 05:58:11Z toneman1138 $
+ *
+ */
+
+#if defined(DYNAMIC_MODULES) && defined(PPC_TARGET)
+
+#include "backends/plugins/elf/elf-loader.h"
+#include "backends/plugins/elf/ppc-loader.h"
+
+#include "common/debug.h"
+
+bool PPCDLObject::relocate(Common::SeekableReadStream* DLFile, unsigned long offset, unsigned long size, void *relSegment) {
+	Elf32_Rela *rel = NULL;
+
+	if (!(rel = (Elf32_Rela *)malloc(size))) {
+		warning("elfloader: Out of memory.");
+		return false;
+	}
+
+	if (DLFile->seek(offset, SEEK_SET) < 0 ||
+			DLFile->read(rel, size) != size) {
+		warning("elfloader: Relocation table load failed.");
+		free(rel);
+		return false;
+	}
+
+	int cnt = size / sizeof(*rel);
+
+	debug(2, "elfloader: Loaded relocation table. %d entries. base address=%p\n", cnt, relSegment);
+
+	uint32 *src;
+	uint32 value;
+
+	for (int i = 0; i < cnt; i++) {
+		// Get the symbol this relocation entry is referring to
+		Elf32_Sym *sym = (Elf32_Sym *)(_symtab) + (REL_INDEX(rel[i].r_info));
+
+		// Get the target instruction in the code
+		src = (uint32 *)((char *)relSegment + rel[i].r_offset - _segmentVMA);
+		value = sym->st_value + rel[i].r_addend;
+
+		//debug(8, "elfloader: i=%05d %p +0x%04x: (0x%08x) 0x%08x ", i, src, rel[i].r_addend, sym->st_value, *src);
+
+		switch (REL_TYPE(rel[i].r_info)) {
+		case R_PPC_ADDR32:
+			*src = value;
+			debug(8, "elfloader: R_PPC_ADDR32 -> 0x%08x\n", *src);
+			break;
+		case R_PPC_ADDR16_LO:
+			*((uint16 *) src) = value;
+			debug(8, "elfloader: R_PPC_ADDR16_LO -> 0x%08x\n", *src);
+			break;
+		case R_PPC_ADDR16_HI:
+			*(uint16 *) src = value >> 16;
+			debug(8, "elfloader: R_PPC_ADDR16_HA -> 0x%08x\n", *src);
+			break;
+		case R_PPC_ADDR16_HA:
+			*(uint16 *) src = (value + 0x8000) >> 16;
+			debug(8, "elfloader: R_PPC_ADDR16_HA -> 0x%08x\n", *src);
+			break;
+		case R_PPC_REL24:
+			*src = (*src & ~0x03fffffc) | ((value - (uint32) src) & 0x03fffffc);
+			debug(8, "elfloader: R_PPC_REL24 -> 0x%08x\n", *src);
+			break;
+		case R_PPC_REL32:
+			*src = value - (uint32) src;
+			debug(8, "elfloader: R_PPC_REL32 -> 0x%08x\n", *src);
+			break;
+		default:
+			warning("elfloader: Unknown relocation type %d\n", REL_TYPE(rel[i].r_info));
+			free(rel);
+			return false;
+		}
+	}
+
+	free(rel);
+	return true;
+}
+
+bool PPCDLObject::relocateRels(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) {
+	for (int i = 0; i < ehdr->e_shnum; i++) {
+		Elf32_Shdr *curShdr = &(shdr[i]);
+
+		if ((curShdr->sh_type == SHT_REL) &&
+				curShdr->sh_entsize == sizeof(Elf32_Rel) &&
+				(int)curShdr->sh_link == _symtab_sect &&
+				curShdr->sh_info < ehdr->e_shnum &&
+				(shdr[curShdr->sh_info].sh_flags & SHF_ALLOC)) {
+			warning("elfloader: REL entries not supported!\n");
+			return false;
+		}
+
+		if ((curShdr->sh_type == SHT_RELA) &&
+				curShdr->sh_entsize == sizeof(Elf32_Rela) &&
+				(int)curShdr->sh_link == _symtab_sect &&
+				curShdr->sh_info < ehdr->e_shnum &&
+				(shdr[curShdr->sh_info].sh_flags & SHF_ALLOC)) {
+			if (!relocate(DLFile, curShdr->sh_offset, curShdr->sh_size, _segment))
+				return false;
+		}
+	}
+
+	return true;
+}
+
+#endif /* defined(DYNAMIC_MODULES) && defined(PPC_TARGET) */
+
diff --git a/backends/plugins/elf/ppc-loader.h b/backends/plugins/elf/ppc-loader.h
new file mode 100644
index 0000000000..13043924bb
--- /dev/null
+++ b/backends/plugins/elf/ppc-loader.h
@@ -0,0 +1,40 @@
+/* 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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/branches/gsoc2010-plugins/backends/plugins/arm-loader.h $
+ * $Id: arm-loader.h 52053 2010-08-13 02:58:52Z toneman1138 $
+ *
+ */
+
+#if defined(DYNAMIC_MODULES) && defined(PPC_TARGET)
+
+#include "backends/plugins/elf/elf-loader.h"
+
+class PPCDLObject : public DLObject {
+protected:
+	virtual bool relocate(Common::SeekableReadStream* DLFile, unsigned long offset, unsigned long size, void *relSegment);
+	virtual bool relocateRels(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr);
+
+public:
+    PPCDLObject() : DLObject() {}
+};
+
+#endif /* defined(DYNAMIC_MODULES) && defined(PPC_TARGET) */
+
diff --git a/backends/plugins/elf/shorts-segment-manager.cpp b/backends/plugins/elf/shorts-segment-manager.cpp
new file mode 100644
index 0000000000..612ef19bbe
--- /dev/null
+++ b/backends/plugins/elf/shorts-segment-manager.cpp
@@ -0,0 +1,84 @@
+/* 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 "backends/plugins/elf/shorts-segment-manager.h"
+
+#include "common/debug.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(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) {
+		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 /* DYNAMIC_MODULES && MIPS_TARGET */
diff --git a/backends/plugins/elf/shorts-segment-manager.h b/backends/plugins/elf/shorts-segment-manager.h
new file mode 100644
index 0000000000..b3650562ed
--- /dev/null
+++ b/backends/plugins/elf/shorts-segment-manager.h
@@ -0,0 +1,103 @@
+/* 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)
+
+#ifndef SHORTS_SEGMENT_MANAGER_H
+#define SHORTS_SEGMENT_MANAGER_H
+
+#include "backends/plugins/elf/elf32.h"
+
+#include "common/singleton.h"
+#include "common/list.h"
+
+#define ShortsMan ShortSegmentManager::instance()
+
+/**
+ * ShortSegmentManager
+ *
+ * Since MIPS is limited to 32 bits per instruction, loading data that's further away than 16 bits
+ * takes several instructions. Thus, small global data (which is likely to be accessed a lot from
+ * multiple locations) is often put into a GP-relative area (GP standing for the global pointer register)
+ * in MIPS processors. This class manages these segments of small global data, and is used by the
+ * member functions of MIPSDLObject, which query in information from this manager in order to deal with
+ * this segment during the loading/unloading of plugins.
+ *
+ * Since there's no true dynamic linker to change the GP register between plugins and the main engine,
+ * custom ld linker scripts for both the main executable and the plugins ensure the GP-area is in the
+ * same place for both. The ShortSegmentManager accesses this place via the symbols __plugin_hole_start
+ * and __plugin_hole_end, which are defined in those custom ld linker scripts.
+ */
+class ShortSegmentManager : public Common::Singleton<ShortSegmentManager> {
+private:
+	char *_shortsStart;
+	char *_shortsEnd;
+
+public:
+	char *getShortsStart() {
+		return _shortsStart;
+	}
+
+	// Returns whether or not an absolute address is in the GP-relative section.
+	bool inGeneralSegment(char *addr) {
+		return ((char *)addr >= _shortsStart && (char *)addr < _shortsEnd);
+	}
+
+	class Segment {
+	private:
+		friend class ShortSegmentManager;
+		Segment(char *start, int size, char *origAddr) : _startAddress(start), _size(size), _origAddress(origAddr) {}
+		~Segment() {}
+		char *_startAddress;		// Start of shorts segment in memory
+		int  _size;					// Size of shorts segment
+		char *_origAddress;			// Original address this segment was supposed to be at
+	public:
+		char *getStart() {
+			return _startAddress;
+		}
+		char *getEnd() {
+			return (_startAddress + _size);
+		}
+		Elf32_Addr getOffset() {
+			return (Elf32_Addr)(_startAddress - _origAddress);
+		}
+		bool inSegment(char *addr) {
+			return ((char *)addr >= _startAddress && (char *)addr <= _startAddress + _size);
+		}
+	};
+
+	Segment *newSegment(int size, char *origAddr);
+	void deleteSegment(Segment *);
+
+private:
+	ShortSegmentManager();
+	friend class Common::Singleton<ShortSegmentManager>;
+	Common::List<Segment *> _list;
+	char *_highestAddress;
+};
+
+#endif /* SHORTS_SEGMENT_MANAGER_H */
+
+#endif /* defined(DYNAMIC_MODULES) && defined(MIPS_TARGET) */