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Diffstat (limited to 'backends/plugins/elf/elf-loader.h')
| -rw-r--r-- | backends/plugins/elf/elf-loader.h | 105 |
1 files changed, 104 insertions, 1 deletions
diff --git a/backends/plugins/elf/elf-loader.h b/backends/plugins/elf/elf-loader.h index 5692c8a07b..87907d67c9 100644 --- a/backends/plugins/elf/elf-loader.h +++ b/backends/plugins/elf/elf-loader.h @@ -1 +1,104 @@ -dummy +/* 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_PLUGINS_ELF_LOADER_H +#define BACKENDS_PLUGINS_ELF_LOADER_H + +#include "common/scummsys.h" + +#if defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) + +#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: + Common::SeekableReadStream *_file; + + byte *_segment; + Elf32_Sym *_symtab; + char *_strtab; + + uint32 _segmentSize; + ptrdiff_t _segmentOffset; + uint32 _segmentVMA; + + uint32 _symbol_cnt; + int32 _symtab_sect; + void *_dtors_start, *_dtors_end; + + virtual void unload(); + bool load(); + + bool readElfHeader(Elf32_Ehdr *ehdr); + bool readProgramHeaders(Elf32_Ehdr *ehdr, Elf32_Phdr *phdr, Elf32_Half num); + virtual bool loadSegment(Elf32_Phdr *phdr); + Elf32_Shdr *loadSectionHeaders(Elf32_Ehdr *ehdr); + int loadSymbolTable(Elf32_Ehdr *ehdr, Elf32_Shdr *shdr); + bool loadStringTable(Elf32_Shdr *shdr); + virtual void relocateSymbols(ptrdiff_t offset); + + // architecture specific + + /** + * Follow the instruction of a relocation section. + * + * @param fileOffset Offset into the File + * @param size Size of relocation section + * @param relSegment Base address of relocated segment in memory (memory offset) + */ + virtual bool relocate(Elf32_Off offset, Elf32_Word size, byte *relSegment) = 0; + virtual bool relocateRels(Elf32_Ehdr *ehdr, Elf32_Shdr *shdr) = 0; + + // platform specific + virtual void *allocSegment(size_t boundary, size_t size) const = 0; + virtual void freeSegment(void *segment) const = 0; + virtual void flushDataCache(void *ptr, uint32 len) const = 0; + +public: + DLObject(); + virtual ~DLObject(); + + bool open(const char *path); + bool close(); + void *symbol(const char *name); + void discard_symtab(); +}; + +#endif /* defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) */ + +#endif /* BACKENDS_PLUGINS_ELF_LOADER_H */ + |