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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 - Just `#[no_mangle]` would be sufficient but
[RFC3325](https://rust-lang.github.io/rfcs/3325-unsafe-attributes.html) uses [RFC3325](https://rust-lang.github.io/rfcs/3325-unsafe-attributes.html) uses
this notation to draw reviewer attention to attributes which might cause 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 - `_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. used by the bootloader to pass things like a pointer to the device tree.
According to the standard aarch64 calling convention (which is what According to the standard aarch64 calling convention (which is what