[MIPS] Add seccomp bpf support

sandbox/linux/seccomp-bpf/syscall_iterator.h

 // Copyright (c) 2012 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 SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_ITERATOR_H__
 #define SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_ITERATOR_H__
 
 #include <stdint.h>
 
 #include "base/basictypes.h"
@@ skipping 17 matching lines @@
 // Example usage:
 //   for (SyscallIterator iter(false); !iter.Done(); ) {
 //     uint32_t sysnum = iter.Next();
 //     // Do something with sysnum.
 //   }
 //
 // TODO(markus): Make this a classic C++ iterator.
 class SANDBOX_EXPORT SyscallIterator {
  public:
   explicit SyscallIterator(bool invalid_only)
+#if defined(__mips__) && (_MIPS_SIM == _MIPS_SIM_ABI32)
+      : invalid_only_(invalid_only), done_(false), num_(4000) {}

[jln (very slow on Chromium), 2014/05/02 20:42:04]

Is there a defined symbol instad of "4000"?

[nedeljko, 2014/05/07 15:40:05]

__NR_Linux can be used, although I need to include appropriate header file for
this.
On the other hand, I will use num_(0) here in new patch... 

+#else
       : invalid_only_(invalid_only), done_(false), num_(0) {}
-
+#endif
   bool Done() const { return done_; }
   uint32_t Next();
   static bool IsValid(uint32_t num);
 
  private:
   static bool IsArmPrivate(uint32_t num);
 
   bool invalid_only_;
   bool done_;
   uint32_t num_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(SyscallIterator);
 };
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_ITERATOR_H__