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| author | David Lechner <david@pybricks.com> | 2023-06-11 14:53:15 -0500 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2023-06-14 17:43:44 +1000 |
| commit | b02a5fa10aba1b17c9a24a073992ded8d7031a69 (patch) | |
| tree | 71846d77304c8602fc373db03bed7ec613e9bee3 /py/makemoduledefs.py | |
| parent | 8cf9898dd3c93f3226d009ebce30f1f1c97b7afb (diff) | |
| download | micropython-b02a5fa10aba1b17c9a24a073992ded8d7031a69.tar.gz micropython-b02a5fa10aba1b17c9a24a073992ded8d7031a69.zip | |
py/nlraarch64: Fix dangerous use of input register.
Starting with 2757acf6, the `top` variable in `nlr_jump()` in
`nlraarch64.c` was assigned to register `x19` by the compiler. However,
the assembly code writes over that register with
ldp x19, x20, [%0, #32]
since `%0` is now `x19`. This causes the next line
ldp lr, x9, [%0, #16]
to load the wrong values.
To fix the issue, we move the value of the `top` variable from an unknown
register to a known register at the beginning of the asm code then only use
known/hard-coded registers after that.
Fixes issue #11754.
Signed-off-by: David Lechner <david@pybricks.com>
Diffstat (limited to 'py/makemoduledefs.py')
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