Initial implementation of Bare Metal Mode for NaCl.

components/nacl/loader/nonsfi/elf_util.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_NACL_LOADER_NONSFI_ELF_UTIL_H_
+#define COMPONENTS_NACL_LOADER_NONSFI_ELF_UTIL_H_
+
+#include "base/basictypes.h"
+#include "components/nacl/loader/nonsfi/nonsfi_error_code.h"
+#include "native_client/src/include/elf32.h"
+#include "native_client/src/include/portability.h"
+
+#if !defined(OS_LINUX) || NACL_BUILD_SUBARCH != 32
+#error Non SFI mode is currently supported only on linux.
+#endif
+
+struct NaClDesc;
+
+namespace nacl {
+namespace nonsfi {
+
+class ElfImage {
+ public:
+  // Limit of elf program headers allowed.
+  enum {
+    MAX_PROGRAM_HEADERS = 128
+  };
+
+  ElfImage();
+  ~ElfImage();
+
+  // Available only after Load() is called.
+  uintptr_t entry_point() const {
+    return ehdr_.e_entry + load_bias_;
+  }
+
+  // Reads the ELF file from the descriptor and stores the header information
+  // into this instance.
+  NonSfiErrorCode Read(struct NaClDesc* descriptor);
+
+  // Loads the ELF executable to the memory.
+  NonSfiErrorCode Load(struct NaClDesc* descriptor);
+
+ private:
+  Elf32_Ehdr ehdr_;
+  Elf32_Phdr phdrs_[MAX_PROGRAM_HEADERS];
+  Elf32_Addr load_bias_;
+
+  DISALLOW_COPY_AND_ASSIGN(ElfImage);
+};
+
+}  // namespace nonsfi
+}  // namespace nacl
+
+#endif  // COMPONENTS_NACL_LOADER_NONSFI_ELF_UTIL_H_