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fix: fix frame pointer manipulation #62

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fix: fix frame pointer manipulation #62

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@rosshjb rosshjb commented Nov 5, 2024 •
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Two changes were made:

  1. In the original code, frame pointer FP is changed to point to SP, but it doesn't be restored to original value in the end — the FP is a callee-saved register. So, we should save an existing FP value and restore the value later.
  2. The FP points to top of stack frame. So the FP should refer the variables inside the frame with non-negative offset.
neldredge added a commit to neldredge/HelloSilicon that referenced this pull request Mar 25, 2025
@neldredge
Update README.md
b9f14d8 
Remove incorrect comment about `LSL X1, X2, below#1` being an alias for `ORR X1, XZR, X2, LSL below#1`. Per the Architecture Reference Manual, it is instead an alias for `UBFM X1, X2, below#63, below#62`. (Of course they have the same effect.)
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