Finished initial abstraction of ELF-loader (works for DS)

svn-id: r51233

1 files changed, 85 insertions, 0 deletions

diff --git a/backends/plugins/elf-loader.h b/backends/plugins/elf-loader.h
new file mode 100644
index 0000000000..e8c5701f6e
--- /dev/null
+++ b/backends/plugins/elf-loader.h
@@ -0,0 +1,85 @@
+/* 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 LOADER_H
+#define LOADER_H
+
+#include "backends/plugins/elf32.h"
+#include "common/list.h"
+
+#define MAXDLERRLEN 80
+
+class DLObject {
+protected:
+    char *_errbuf; /* For error messages, at least MAXDLERRLEN in size */
+
+    void *_segment, *_symtab;
+    char *_strtab;
+    int _symbol_cnt;
+    int _symtab_sect;
+    void *_dtors_start, *_dtors_end;
+
+    int _segmentSize;
+
+    void seterror(const char *fmt, ...);
+    void unload();
+    bool relocate(Common::SeekableReadStream* DLFile, unsigned long offset, unsigned long size, void *relSegment);
+    bool load(Common::SeekableReadStream* DLFile);
+
+    bool readElfHeader(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr);
+    bool readProgramHeaders(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Phdr *phdr, int num);
+    bool loadSegment(Common::SeekableReadStream* DLFile, Elf32_Phdr *phdr);
+    Elf32_Shdr *loadSectionHeaders(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr);
+    int loadSymbolTable(Common::SeekableReadStream* DLFile, Elf32_Ehdr *ehdr, Elf32_Shdr *shdr);
+    bool loadStringTable(Common::SeekableReadStream* DLFile, Elf32_Shdr *shdr);
+    void relocateSymbols(Elf32_Addr offset);
+    bool relocateRels(Common::SeekableReadStream* DLFile, 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), _segment(NULL), _symtab(NULL),
+            _strtab(NULL), _symbol_cnt(0), _symtab_sect(-1), _dtors_start(NULL), _dtors_end(NULL),
+            _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);
+}
+
+//The following need to be defined by specific ports.
+extern void flushDataCache();
+extern bool dlRelocate(Common::SeekableReadStream* DLFile, unsigned long offset, unsigned long size, void *relSegment);
+
+#endif /* LOADER_H */