1 files changed, 721 insertions, 0 deletions

diff --git a/backends/platform/ps2/ps2loader.cpp b/backends/platform/ps2/ps2loader.cpp
new file mode 100644
index 0000000000..ff6702de17
--- /dev/null
+++ b/backends/platform/ps2/ps2loader.cpp
@@ -0,0 +1,721 @@
+/* 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/platform/ps2/ps2loader.cpp $
+ * TODO: $ID
+ *
+ */
+
+#if defined(DYNAMIC_MODULES) && defined(__PS2__)
+
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <malloc.h>
+#include <unistd.h>
+#include <sys/_default_fcntl.h>
+
+#include <ps2utils.h>
+
+#include "backends/platform/ps2/ps2loader.h"
+//#include "backends/platform/ps2/powerman.h" //TODO
+
+//#define __PS2_DEBUG_PLUGINS__
+
+#ifdef __PS2_DEBUG_PLUGINS__
+#define DBG(x,...) fprintf(stderr,x, ## __VA_ARGS__)
+#else
+#define DBG(x,...)
+#endif
+
+#define seterror(x,...) fprintf(stderr,x, ## __VA_ARGS__)
+
+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
+
+// Get rid of symbol table in memory
+void DLObject::discard_symtab() {
+	free(_symtab);
+	free(_strtab);
+	_symtab = NULL;
+	_strtab = NULL;
+	_symbol_cnt = 0;
+}
+
+// Unload all objects from memory
+void DLObject::unload() {
+	discard_symtab();
+	free(_segment);
+	_segment = NULL;
+
+	if (_shortsSegment) {
+		ShortsMan.deleteSegment(_shortsSegment);
+		_shortsSegment = NULL;
+	}
+}
+
+/**
+ * Follow the instruction of a relocation section.
+ *
+ * @param fd 		 File Descriptor
+ * @param offset 	 Offset into the File
+ * @param size   	 Size of relocation section
+ * @param relSegment Base address of relocated segment in memory (memory offset)
+ *
+ */
+bool DLObject::relocate(int fd, unsigned long offset, unsigned long size, void *relSegment) {
+	Elf32_Rel *rel = NULL;	// relocation entry
+
+	// Allocate memory for relocation table
+	if (!(rel = (Elf32_Rel *)malloc(size))) {
+		seterror("Out of memory.");
+		return false;
+	}
+
+	// Read in our relocation table
+	if (lseek(fd, offset, SEEK_SET) < 0 ||
+	        read(fd, rel, size) != (ssize_t)size) {
+		seterror("Relocation table load failed.");
+		free(rel);
+		return false;
+	}
+
+	// Treat each relocation entry. Loop over all of them
+	int cnt = size / sizeof(*rel);
+
+	DBG("Loaded relocation table. %d entries. base address=%p\n", 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
+					DBG("R_MIPS_HI16: i=%d, offset=%x, ahl = %x, target = %x\n",
+					    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
+					seterror("R_MIPS_LO16 w/o preceding R_MIPS_HI16 at relocation %d!\n", 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)
+					DBG("R_MIPS_LO16: i=%d, offset=%x, a=%x, ahl = %x, lastTarget = %x, origt = %x, target = %x\n",
+					    i, rel[i].r_offset, a, ahl, *lastTarget, origTarget, *target);
+				if (lo16InShorts && debugRelocs[2]++ < DEBUG_NUM)
+					DBG("R_MIPS_LO16s: i=%d, offset=%x, a=%x, ahl = %x, lastTarget = %x, origt = %x, target = %x\n",
+					    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)
+					DBG("R_MIPS_26: i=%d, offset=%x, symbol=%d, stinfo=%x, a=%x, origTarget=%x, target=%x\n",
+					    i, rel[i].r_offset, REL_INDEX(rel[i].r_info), sym->st_info, a, origTarget, *target);
+			} else {
+				if (debugRelocs[4]++ < DEBUG_NUM)
+					DBG("R_MIPS_26: i=%d, offset=%x, symbol=%d, stinfo=%x, a=%x, origTarget=%x, target=%x\n",
+					    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)
+					DBG("R_MIPS_GPREL16: i=%d, a=%x, gpVal=%x, origTarget=%x, target=%x, offset=%x\n",
+					    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)
+					DBG("R_MIPS_32: i=%d, a=%x, origTarget=%x, target=%x\n", i, a, origTarget, *target);
+			}
+			break;
+
+		default:
+			seterror("Unknown relocation type %x at relocation %d.\n", REL_TYPE(rel[i].r_info), i);
+			free(rel);
+			return false;
+		}
+	}
+
+	DBG("Done with relocation. extendedHi16=%d\n\n", extendedHi16);
+
+	free(rel);
+	return true;
+}
+
+bool DLObject::readElfHeader(int fd, Elf32_Ehdr *ehdr) {
+	// Start reading the elf header. Check for errors
+	if (read(fd, ehdr, sizeof(*ehdr)) != sizeof(*ehdr) ||
+	        memcmp(ehdr->e_ident, ELFMAG, SELFMAG) ||					// Check MAGIC
+	        ehdr->e_type != ET_EXEC ||									// Check for executable
+	        ehdr->e_machine != EM_MIPS ||								// Check for MIPS machine type
+	        ehdr->e_phentsize < sizeof(Elf32_Phdr)	 ||					// Check for size of program header
+	        ehdr->e_shentsize != sizeof(Elf32_Shdr)) {					// Check for size of section header
+		seterror("Invalid file type.");
+		return false;
+	}
+
+	DBG("phoff = %d, phentsz = %d, phnum = %d\n",
+	    ehdr->e_phoff, ehdr->e_phentsize, ehdr->e_phnum);
+
+	return true;
+}
+
+bool DLObject::readProgramHeaders(int fd, Elf32_Ehdr *ehdr, Elf32_Phdr *phdr, int num) {
+	// Read program header
+	if (lseek(fd, ehdr->e_phoff + sizeof(*phdr)*num, SEEK_SET) < 0 ||
+	        read(fd, phdr, sizeof(*phdr)) != sizeof(*phdr)) {
+		seterror("Program header load failed.");
+		return false;
+	}
+
+	// Check program header values
+	if (phdr->p_type != PT_LOAD  || phdr->p_filesz > phdr->p_memsz) {
+		seterror("Invalid program header.");
+		return false;
+	}
+
+	DBG("offs = %x, filesz = %x, memsz = %x, align = %x\n",
+	    phdr->p_offset, phdr->p_filesz, phdr->p_memsz, phdr->p_align);
+
+	return true;
+
+}
+
+bool DLObject::loadSegment(int fd, 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
+		DBG("extra mem is %x\n", 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))) {
+			seterror("Out of memory.\n");
+			return false;
+		}
+		DBG("allocated segment @ %p\n", _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();
+		DBG("shorts segment @ %p to %p. Segment wants to be at %x. Offset=%x\n",
+		    _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) {
+		DBG("Setting %p to %p to 0 for bss\n", baseAddress + phdr->p_filesz, baseAddress + phdr->p_memsz);
+		memset(baseAddress + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
+	}
+	// Read the segment into memory
+	if (lseek(fd, phdr->p_offset, SEEK_SET) < 0 ||
+	        read(fd, baseAddress, phdr->p_filesz) != (ssize_t)phdr->p_filesz) {
+		seterror("Segment load failed.");
+		return false;
+	}
+
+	return true;
+}
+
+
+Elf32_Shdr * DLObject::loadSectionHeaders(int fd, Elf32_Ehdr *ehdr) {
+
+	Elf32_Shdr *shdr = NULL;
+
+	// Allocate memory for section headers
+	if (!(shdr = (Elf32_Shdr *)malloc(ehdr->e_shnum * sizeof(*shdr)))) {
+		seterror("Out of memory.");
+		return NULL;
+	}
+
+	// Read from file into section headers
+	if (lseek(fd, ehdr->e_shoff, SEEK_SET) < 0 ||
+	        read(fd, shdr, ehdr->e_shnum * sizeof(*shdr)) !=
+	        (ssize_t)(ehdr->e_shnum * sizeof(*shdr))) {
+		seterror("Section headers load failed.");
+		return NULL;
+	}
+
+	return shdr;
+}
+
+int DLObject::loadSymbolTable(int fd, 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++) {
+		//DBG("Section %d: type = %x, size = %x, entsize = %x, link = %x\n",
+		// i, shdr[i].sh_type, shdr[i].sh_size, shdr[i].sh_entsize, shdr[i].sh_link);
+
+		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) {
+		seterror("No symbol table.");
+		return -1;
+	}
+
+	DBG("Symbol section at section %d, size %x\n", _symtab_sect, shdr[_symtab_sect].sh_size);
+
+	// Allocate memory for symbol table
+	if (!(_symtab = malloc(shdr[_symtab_sect].sh_size))) {
+		seterror("Out of memory.");
+		return -1;
+	}
+
+	// Read symbol table into memory
+	if (lseek(fd, shdr[_symtab_sect].sh_offset, SEEK_SET) < 0 ||
+	        read(fd, _symtab, shdr[_symtab_sect].sh_size) !=
+	        (ssize_t)shdr[_symtab_sect].sh_size) {
+		seterror("Symbol table load failed.");
+		return -1;
+	}
+
+	// Set number of symbols
+	_symbol_cnt = shdr[_symtab_sect].sh_size / sizeof(Elf32_Sym);
+	DBG("Loaded %d symbols.\n", _symbol_cnt);
+
+	return _symtab_sect;
+
+}
+
+bool DLObject::loadStringTable(int fd, 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))) {
+		seterror("Out of memory.");
+		return false;
+	}
+
+	// Read string table into memory
+	if (lseek(fd, shdr[string_sect].sh_offset, SEEK_SET) < 0 ||
+	        read(fd, _strtab, shdr[string_sect].sh_size) !=
+	        (ssize_t)shdr[string_sect].sh_size) {
+		seterror("Symbol table strings load failed.");
+		return false;
+	}
+	return true;
+}
+
+void DLObject::relocateSymbols(Elf32_Addr offset, Elf32_Addr shortsOffset) {
+
+	int shortsCount = 0, othersCount = 0;
+	DBG("Relocating symbols by %x. Shorts offset=%x\n", offset, shortsOffset);
+
+	// 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)) {
+				othersCount++;
+				s->st_value += offset;
+				if (s->st_value < (Elf32_Addr)_segment || s->st_value > (Elf32_Addr)_segment + _segmentSize)
+					seterror("Symbol out of bounds! st_value = %x\n", s->st_value);
+			} else {	// shorts section
+				shortsCount++;
+				s->st_value += shortsOffset;
+				if (!_shortsSegment->inSegment((char *)s->st_value))
+					seterror("Symbol out of bounds! st_value = %x\n", s->st_value);
+			}
+
+		}
+
+	}
+
+	DBG("Relocated %d short symbols, %d others.\n", shortsCount, othersCount);
+}
+
+bool DLObject::relocateRels(int fd, 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(fd, curShdr->sh_offset, curShdr->sh_size, _segment)) {
+					return false;
+				}
+			} else { 	// In Shorts segment
+				if (!relocate(fd, curShdr->sh_offset, curShdr->sh_size, (void *)_shortsSegment->getOffset())) {
+					return false;
+				}
+			}
+
+		}
+	}
+
+	return true;
+}
+
+
+bool DLObject::load(int fd) {
+	fprintf(stderr, "In DLObject::load\n");
+
+	Elf32_Ehdr ehdr;	// ELF header
+	Elf32_Phdr phdr;	// Program header
+	Elf32_Shdr *shdr;	// Section header
+	bool ret = true;
+
+	if (readElfHeader(fd, &ehdr) == false) {
+		return false;
+	}
+
+	for (int i = 0; i < ehdr.e_phnum; i++) {	//	Load our 2 segments
+
+		fprintf(stderr, "Loading segment %d\n", i);
+
+		if (readProgramHeaders(fd, &ehdr, &phdr, i) == false)
+			return false;
+
+		if (!loadSegment(fd, &phdr))
+			return false;
+	}
+
+	if ((shdr = loadSectionHeaders(fd, &ehdr)) == NULL)
+		ret = false;
+
+	if (ret && ((_symtab_sect = loadSymbolTable(fd, &ehdr, shdr)) < 0))
+		ret = false;
+
+	if (ret && (loadStringTable(fd, shdr) == false))
+		ret = false;
+
+	if (ret)
+		relocateSymbols((Elf32_Addr)_segment, _shortsSegment->getOffset());	// Offset by our segment allocated address
+
+	if (ret && (relocateRels(fd, &ehdr, shdr) == false))
+		ret = false;
+
+	free(shdr);
+
+	return ret;
+}
+
+bool DLObject::open(const char *path) {
+	int fd;
+	void *ctors_start, *ctors_end;
+
+	DBG("open(\"%s\")\n", path);
+
+	// Get the address of the global pointer
+	_gpVal = (unsigned int) & _gp;
+	DBG("_gpVal is %x\n", _gpVal);
+
+	PowerMan.beginCriticalSection();
+
+	if ((fd = ::open(path, O_RDONLY)) < 0) {
+		seterror("%s not found.", path);
+		return false;
+	}
+
+	// Try to load and relocate
+	if (!load(fd)) {
+		::close(fd);
+		unload();
+		return false;
+	}
+
+	::close(fd);
+
+	PowerMan.endCriticalSection();
+
+	// flush data cache
+	sceKernelDcacheWritebackAll();
+
+	// Get the symbols for the global constructors and destructors
+	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 == NULL || ctors_end == NULL || _dtors_start == NULL ||
+	        _dtors_end == NULL) {
+		seterror("Missing ctors/dtors.");
+		_dtors_start = _dtors_end = NULL;
+		unload();
+		return false;
+	}
+
+	DBG("Calling constructors.\n");
+	for (void (**f)(void) = (void (**)(void))ctors_start; f != ctors_end; f++)
+		(**f)();
+
+	DBG("%s opened ok.\n", path);
+	return true;
+}
+
+bool DLObject::close() {
+	if (_dtors_start != NULL && _dtors_end != NULL)
+		for (void (**f)(void) = (void (**)(void))_dtors_start; f != _dtors_end; f++)
+			(**f)();
+	_dtors_start = _dtors_end = NULL;
+	unload();
+	return true;
+}
+
+void *DLObject::symbol(const char *name) {
+	DBG("symbol(\"%s\")\n", name);
+
+	if (_symtab == NULL || _strtab == NULL || _symbol_cnt < 1) {
+		seterror("No symbol table loaded.");
+		return NULL;
+	}
+
+	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) &&
+		        /*_strtab[s->st_name] == '_' && */ // Try to make this more efficient
+		        !strcmp(name, _strtab + s->st_name)) {
+
+			// We found the symbol
+			DBG("=> %p\n", (void*)s->st_value);
+			return (void*)s->st_value;
+		}
+	}
+
+	seterror("Symbol \"%s\" not found.", name);
+	return NULL;
+}
+
+
+
+ShortSegmentManager::ShortSegmentManager() {
+	_shortsStart = &__plugin_hole_start ;
+	_shortsEnd = &__plugin_hole_end;
+}
+
+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;
+}
+
+static char dlerr[MAXDLERRLEN];
+
+void *dlopen(const char *filename, int flags) {
+	DLObject *obj = new DLObject(dlerr);
+	if (obj->open(filename))
+		return (void *)obj;
+	delete obj;
+	return NULL;
+}
+
+int dlclose(void *handle) {
+	DLObject *obj = (DLObject *)handle;
+	if (obj == NULL) {
+		strcpy(dlerr, "Handle is NULL.");
+		return -1;
+	}
+	if (obj->close()) {
+		delete obj;
+		return 0;
+	}
+	return -1;
+}
+
+void *dlsym(void *handle, const char *symbol) {
+	if (handle == NULL) {
+		strcpy(dlerr, "Handle is NULL.");
+		return NULL;
+	}
+	return ((DLObject *)handle)->symbol(symbol);
+}
+
+const char *dlerror() {
+	return dlerr;
+}
+
+void dlforgetsyms(void *handle) {
+	if (handle != NULL)
+		((DLObject *)handle)->discard_symtab();
+}
+
+
+#endif /* DYNAMIC_MODULES && __PS2__ */