# [−][src]Function core::arch::arm::__breakpoint

    pub unsafe fn __breakpoint(val: i32)

🔬 This is a nightly-only experimental API. (`stdsimd` #48556)
This is supported on ARM only.

Inserts a breakpoint instruction.

`val` is a compile-time constant integer in range `[0, 255]`.

The breakpoint instruction inserted is:

- `BKPT` when compiling as T32,
- `BRK` when compiling as A32 or A64.

# Safety

If `val` is out-of-range the behavior is undefined.

# Note

ARM's documentation defines that `__breakpoint` accepts the following values for `val`:

- `0...65535` when compiling as A32 or A64,
- `0...255` when compiling as T32.

The current implementation only accepts values in range `[0, 255]` - if the value is out-of-range the behavior is undefined.

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)