![]() ![]() Through the years, there have been many revisions of the ARM architecture, written as ARMv X for some version X. However, its most visible use is in cellular phones, tablets and some laptops. Today, it is used primarily in embedded systems: everything from toys, to home automation, to automobiles. About ARM and ARMv7-AĪRM is one of the older commercial “RISC” processor designs, dating back to the early 1980s. In this section, we summarize the relevant parts of the ARM processor architecture. The Stack Pointer, Thread Pointer, and Program Counter.We assume no prior knowledge about the internals of Native Client, on x86 or any other architecture, but we do assume some familiarity with assembly languages in general. On this page, we describe how Native Client works on 32-bit ARM. Note that the Portable Native Client compiler itself is also untrusted: it too runs in the ARM sandbox described in this document. This may change at a point in time: Portable Native Client doesn’t necessarily need this sandbox to execute code on ARM. The portable bitcode contained in a pexe is translated to a 32-bit ARM nexe before execution. ![]() Security is provided with a low performance overhead of about 10% over regular ARM code, and as you’ll see in this document the sandbox model is beautifully simple, meaning that the trusted codebase is much easier to validate.Īs an implementation detail, the Native Client 32-bit ARM sandbox is currently used by Portable Native Client to execute code on 32-bit ARM machines in a safe manner. The ARM sandbox is an extension of earlier work on Native Client for x86 processors. Native Client for ARM is a sandboxing technology for running programs-even malicious ones-safely, on computers that use 32-bit ARM processors. Please visit our migration guide for details. Deprecation of the technologies described here has been announced for platforms other than ChromeOS. ![]()
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