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/* 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 PSPLOADER_H
#define PSPLOADER_H
#include "elf32.h"
#include "common/list.h"
#include "common/singleton.h"
#define MAXDLERRLEN 80
#define ShortsMan ShortSegmentManager::instance()
class ShortSegmentManager : public Common::Singleton<ShortSegmentManager> {
private:
char *_shortsStart;
char *_shortsEnd;
public:
char *getShortsStart() {
return _shortsStart;
}
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;
};
class DLObject {
protected:
char *_errbuf; /* For error messages, at least MAXDLERRLEN in size */
ShortSegmentManager::Segment *_shortsSegment; // For assigning shorts ranges
void *_segment, *_symtab;
char *_strtab;
int _symbol_cnt;
int _symtab_sect;
void *_dtors_start, *_dtors_end;
unsigned int _gpVal; // Value of Global Pointer
int _segmentSize;
void seterror(const char *fmt, ...);
void unload();
bool relocate(int fd, unsigned long offset, unsigned long size, void *);
bool load(int fd);
bool readElfHeader(int fd, Elf32_Ehdr *ehdr);
bool readProgramHeaders(int fd, Elf32_Ehdr *ehdr, Elf32_Phdr *phdr, int num);
bool loadSegment(int fd, Elf32_Phdr *phdr);
Elf32_Shdr *loadSectionHeaders(int fd, Elf32_Ehdr *ehdr);
int loadSymbolTable(int fd, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr);
bool loadStringTable(int fd, Elf32_Shdr *shdr);
void relocateSymbols(Elf32_Addr offset, Elf32_Addr shortsOffset);
bool relocateRels(int fd, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr);
public:
bool open(const char *path);
bool close();
void *symbol(const char *name);
void discard_symtab();
DLObject(char *errbuf = NULL) : _errbuf(_errbuf), _shortsSegment(NULL), _segment(NULL), _symtab(NULL),
_strtab(NULL), _symbol_cnt(0), _symtab_sect(-1), _dtors_start(NULL), _dtors_end(NULL), _gpVal(0) ,
_segmentSize(0) {}
};
#define RTLD_LAZY 0
extern "C" {
void *dlopen(const char *filename, int flags);
int dlclose(void *handle);
void *dlsym(void *handle, const char *symbol);
const char *dlerror();
void dlforgetsyms(void *handle);
}
#endif /* PSPLOADER_H */
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