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| author | Alessandro Decina <alessandro.d@gmail.com> | 2021-04-20 19:03:10 +1000 |
|---|---|---|
| committer | Alessandro Decina <alessandro.d@gmail.com> | 2021-05-23 18:03:27 +1000 |
| commit | b2a6967114b2fa9d477226ff7ad53fb55fb692bc (patch) | |
| tree | e3cdff4b6c254131063dd7f4ef4bada6d3bba4fc /src | |
| parent | 12ac719b99560072cbe52a957f22d3fe6946cf2a (diff) | |
| download | rust-b2a6967114b2fa9d477226ff7ad53fb55fb692bc.tar.gz rust-b2a6967114b2fa9d477226ff7ad53fb55fb692bc.zip | |
Add support for BPF inline assembly
Diffstat (limited to 'src')
| -rw-r--r-- | src/doc/unstable-book/src/library-features/asm.md | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/doc/unstable-book/src/library-features/asm.md b/src/doc/unstable-book/src/library-features/asm.md index 5503b3b4b32..77080b54dc8 100644 --- a/src/doc/unstable-book/src/library-features/asm.md +++ b/src/doc/unstable-book/src/library-features/asm.md @@ -30,6 +30,7 @@ Inline assembly is currently supported on the following architectures: - Hexagon - MIPS32r2 and MIPS64r2 - wasm32 +- BPF ## Basic usage @@ -570,6 +571,8 @@ Here is the list of currently supported register classes: | PowerPC | `reg_nonzero` | | `r[1-31]` | `b` | | PowerPC | `freg` | `f[0-31]` | `f` | | wasm32 | `local` | None\* | `r` | +| BPF | `reg` | `r[0-10]` | `r`| +| BPF | `wreg` | `w[0-10]` | `w`| > **Note**: On x86 we treat `reg_byte` differently from `reg` because the compiler can allocate `al` and `ah` separately whereas `reg` reserves the whole register. > @@ -615,6 +618,8 @@ Each register class has constraints on which value types they can be used with. | PowerPC | `reg_nonzero` | None | `i8`, `i16`, `i32` | | PowerPC | `freg` | None | `f32`, `f64` | | wasm32 | `local` | None | `i8` `i16` `i32` `i64` `f32` `f64` | +| BPF | `reg` | None | `i8` `i16` `i32` `i64` | +| BPF | `wreg` | `alu32` | `i8` `i16` `i32`| > **Note**: For the purposes of the above table pointers, function pointers and `isize`/`usize` are treated as the equivalent integer type (`i16`/`i32`/`i64` depending on the target). @@ -674,6 +679,7 @@ Some registers have multiple names. These are all treated by the compiler as ide | Hexagon | `r29` | `sp` | | Hexagon | `r30` | `fr` | | Hexagon | `r31` | `lr` | +| BPF | `r[0-10]` | `w[0-10]` | Some registers cannot be used for input or output operands: |