# Specification of NeKernel's PEF ABI.

The PEF ABI has multiple versions depending on the ISA.

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# 0: General Information (ISA agnostic)

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- Arguments goes from a0 to max argument register of ISA.
- SIMD arguments uses SIMD registers.
- The ABI is stack based, rbp is preserved.

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# 0: General Information (x64)

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- RBP is saved.
- SIMD is saved.

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# 0: General Information (ARM64)

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- BP is saved.
- SIMD is saved.