FUNCTION::REGISTERS\_(3stap) Context Functions FUNCTION::REGISTERS\_(3stap)

# [NAME](#NAME)

function::registers\_valid - Determines validity of **register** and **u\_register** in current context

# [SYNOPSIS](#SYNOPSIS)

```


    registers_valid:long()
```

# [ARGUMENTS](#ARGUMENTS)

None

# [DESCRIPTION](#DESCRIPTION)

This function returns 1 if **register** and **u\_register** can be used in the current context, or 0 otherwise. For example, **registers\_valid** returns 0 when called from a begin or end probe.

# [SEE ALSO0](#SEE_ALSO0)

[*tapset::context*(3stap)](/man/enterprise-packages/systemtap/tapset::context.3stap)

September 2026 SystemTap Tapset Reference Ver

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Document: function::registers_valid(3stap) from systemtap 5.6-r0 (Chainguard OS)
Source: https://sourceware.org/git/systemtap.git