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Faster gdb memory access #380

Merged
merged 2 commits into from
May 13, 2023
Merged

Faster gdb memory access #380

merged 2 commits into from
May 13, 2023

Commits on May 11, 2023

  1. kernel: riscv: use SUM bit for debug visibility 

    Instead of remapping the page to allow the kernel to access a process'
memory, simply set the SUM bit. This makes it no longer an error for the
kernel to access userspace.

Keep setting the `W` bit when we poke, to allow for updating program
memory with breakpoints.

Signed-off-by: Sean Cross <sean@xobs.io>
    @xobs
    xobs committed May 11, 2023
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  2. kernel: gdb: batch 2- and 4-byte accesses 

    Instead of always doing bytewise accesses, support 2- and 4-byte access.
Additionally, recognize when multiple 4-byte reads are required.

Note that an additional optimization may be made here in the future to
prevent having to check every address, but this is left for a future
optimization.

Signed-off-by: Sean Cross <sean@xobs.io>
    @xobs
    xobs committed May 11, 2023
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