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A comment on Oxide on My Wrist: Hubris on PineTime was the best worst idea. Parent comment

Re:Oxide on My Wrist: Hubris on PineTime was the best worst ... by ctz on Monday March 28, 2022 @01:39PM (#30833242)
> non-segmented architectures don't have an architecturally defined way to know the stack base

ARMv8-M does have stack limit registers, which do precisely this. Being a much simpler mechanism than the MPU, they are quicker to switch than the entire MPU state when switching tasks.

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Re:Oxide on My Wrist: Hubris on PineTime was the best worst ... by bcantrill on Monday March 28, 2022 @01:48PM (#30833355)
Yes, true -- it's more accurate to say "architectures traditionally don't have a way to know the stack base." Certainly, having an architecturally-defined way to know the base of the stack is/would be really really helpful, and would allow stack overflow to be at once less dangerous and much more debuggable!
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