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Fix definition of PRIMASK #6599

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PRIMASK is handled incorrectly in Sleigh. From the armv6m manual:

  • Executing the instruction CPSID i sets PRIMASK.PM to 1.
  • Executing the instruction CPSIE i sets PRIMASK.PM to 0.

Sleigh currently has this backwards.

This patch swaps the meaning of 0 and 1, bringing the definition in line with the reference documentation.

PRIMASK is handled incorrectly in Sleigh. From the armv6m manual:
* Executing the instruction CPSID i sets PRIMASK.PM to 1.
* Executing the instruction CPSIE i sets PRIMASK.PM to 0.

So interrupts are enabled if the lowest bit is 0.

This patch swaps the meaning of 0 and 1, bringing the definition in line with
the reference documentation.
@GhidorahRex GhidorahRex self-assigned this May 30, 2024
@GhidorahRex GhidorahRex added Type: Bug Something isn't working Feature: Processor/ARM Status: Triage Information is being gathered labels May 30, 2024
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