disable all interrupts using GM bit

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Device : AT32UC3A1512

Is it possible to set GM bit to disable all interrupts when in application mode. or the execution should be in supervisor mode to change GM bit?

Is it mentioned somewhere in the documentation

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GM bit is present in upper halfword of Status Register.

The upper halfword can only be accessed from a privileged mode. This is mentioned in Architecture manual 2.10 The Status Register.