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psploader.h

/* 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/tags/release-1-2-0/backends/platform/psp/psploader.h $
 * $Id: psploader.h 48632 2010-04-12 06:49:05Z Bluddy $
 *
 */

#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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