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U stands for Undefined (#2566)

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Dustin J. Mitchell 2025-01-19 22:14:33 -05:00 committed by GitHub
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src/bare-metal/aps/inline-assembly.md
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@ -25,7 +25,7 @@ for all these functions.)
- Just `#[no_mangle]` would be sufficient but
[RFC3325](https://rust-lang.github.io/rfcs/3325-unsafe-attributes.html) uses
this notation to draw reviewer attention to attributes which might cause
undesired behavior if used incorrectly.
undefined behavior if used incorrectly.
- `_x0`–`_x3` are the values of registers `x0`–`x3`, which are conventionally
used by the bootloader to pass things like a pointer to the device tree.
According to the standard aarch64 calling convention (which is what