Initial implementation of Bare Metal Mode for NaCl.

components/nacl/loader/nonsfi/elf_loader.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_LOADER_H_
+#define COMPONENTS_NACL_LOADER_NONSFI_ELF_LOADER_H_
+
+#include <elf.h>

[Mark Seaborn, 2013/12/10 19:56:44]

It would be better if these didn't appear in the header.  They could easily end
up conflicting with NaCl's ELF #defines.

You don't actually need to define a class in the header.  This header could just
expose a single function for loading and running an executable given the
descriptor.  Then the class can be defined in the .cc file.

[hidehiko, 2013/12/11 07:56:14]

Removed the include directive.
Instead of having separate functions, I used pimpl for RAII.

+#include <link.h>
+
+#include "base/basictypes.h"
+#include "components/nacl/loader/nonsfi/nonsfi_error_code.h"
+#include "native_client/src/include/portability.h"
+
+#if !defined(OS_LINUX)
+#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:
+  ElfW(Ehdr) ehdr_;
+  ElfW(Phdr) phdrs_[MAX_PROGRAM_HEADERS];
+  ElfW(Addr) load_bias_;
+
+  DISALLOW_COPY_AND_ASSIGN(ElfImage);
+};
+
+}  // namespace nonsfi
+}  // namespace nacl
+
+#endif  // COMPONENTS_NACL_LOADER_NONSFI_ELF_LOADER_H_