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Tag: ARM64

Updated on December 8, 2020December 8, 2020/ Andrew Murray

A Global Variable in U-Boot that caused a Hang

A Global Variable in U-Boot that caused a Hang

The best type of software bug is one where you get to learn something along the way. Like any good disaster, the bug we’re going to explore is one that arose from a chain of unexpected events and bad assumptions. This bug relates to uninitialised data and gives a good insight into the inner workings …

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Updated on December 4, 2020January 18, 2019/ Andrew Murray

Discovering CPU features from userspace with ELF_HWCAP

Discovering CPU features from userspace with ELF_HWCAP

As hardware architectures evolve they introduce new features – many of these features are abstracted away by the kernel yet result in some benefit to the user such as improved security or performance. However some features, like the introduction of a new CPU instruction can only benefit user-space if user-space is able to determine that …

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