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Install early exception handlers #49

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IsaacWoods opened this issue Feb 29, 2020 · 0 comments
Open
7 tasks

Install early exception handlers #49

IsaacWoods opened this issue Feb 29, 2020 · 0 comments
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A-x86_64 Affects the x86_64 architecture C-kernel Component: kernel

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@IsaacWoods
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IsaacWoods commented Feb 29, 2020 •
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Remaining tasks:

  • Probably just hardcode how many IST stacks we create, and their indices
  • Allocate them using the kernel stack allocator (potentially for each CPU, see below)
  • Put all IST stacks in every CPUs (wait... do we need distinct stacks for every CPU [imagine if two CPUs page-fault, and then use the same stacks...] - maybe check what other people do)
  • Put the correct IST indices in the IDT entries for exceptions

To nicely detect kernel stack overflows:

  • Maybe extract symbols of the guard page for the initial kernel stack
  • Make some way of detecting guard pages for non-initial kernel stacks
  • Check for them in the #PF handler
@IsaacWoods IsaacWoods added A-x86_64 Affects the x86_64 architecture C-kernel Component: kernel labels Jun 16, 2022
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