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9.7.2.2 Register Names

The eBPF processor provides ten general-purpose 64-bit registers, which are read-write, and a read-only frame pointer register:

‘%r0 .. %r9’

General-purpose registers.

‘%r10’

Frame pointer register.

Some registers have additional names, to reflect their role in the eBPF ABI:

‘%a’

This is ‘%r0’.

‘%ctx’

This is ‘%r6’.

‘%fp’

This is ‘%r10’.