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105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef BACKENDS_PLUGINS_ELF_LOADER_H
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#define BACKENDS_PLUGINS_ELF_LOADER_H
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#include "common/scummsys.h"
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#if defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER)
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#include <stddef.h>
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#include "backends/plugins/elf/elf32.h"
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#include "backends/plugins/dynamic-plugin.h"
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#include "common/stream.h"
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/**
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* DLObject
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*
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* Class that most directly handles operations on a plugin file
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* (opening it for reading, loading/unloading it in memory, finding a specific symbol in the file, etc.)
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* Subclasses have the same functionality, but implementations specific to different processors/platforms.
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*/
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class DLObject {
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protected:
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Common::SeekableReadStream *_file;
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byte *_segment;
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Elf32_Sym *_symtab;
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char *_strtab;
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uint32 _segmentSize;
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ptrdiff_t _segmentOffset;
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uint32 _segmentVMA;
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uint32 _symbol_cnt;
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int32 _symtab_sect;
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void *_dtors_start, *_dtors_end;
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virtual void unload();
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bool load();
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bool readElfHeader(Elf32_Ehdr *ehdr);
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bool readProgramHeaders(Elf32_Ehdr *ehdr, Elf32_Phdr *phdr, Elf32_Half num);
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virtual bool loadSegment(Elf32_Phdr *phdr);
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Elf32_Shdr *loadSectionHeaders(Elf32_Ehdr *ehdr);
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int findSymbolTableSection(Elf32_Ehdr *ehdr, Elf32_Shdr *shdr);
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int loadSymbolTable(Elf32_Ehdr *ehdr, Elf32_Shdr *shdr);
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bool loadStringTable(Elf32_Shdr *shdr);
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virtual void relocateSymbols(ptrdiff_t offset);
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// architecture specific
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/**
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* Follow the instruction of a relocation section.
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*
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* @param fileOffset Offset into the File
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* @param size Size of relocation section
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* @param relSegment Base address of relocated segment in memory (memory offset)
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*/
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virtual bool relocate(Elf32_Off offset, Elf32_Word size, byte *relSegment) = 0;
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virtual bool relocateRels(Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) = 0;
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// platform specific
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virtual void flushDataCache(void *ptr, uint32 len) const = 0;
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public:
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DLObject();
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virtual ~DLObject();
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/**
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* Test the size of the plugin in memory using the memory manager.
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* @param path Path of file
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*/
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void trackSize(const char *path);
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bool open(const char *path);
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bool close();
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void *symbol(const char *name);
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void discardSymtab();
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};
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#endif /* defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) */
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#endif /* BACKENDS_PLUGINS_ELF_LOADER_H */
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