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About ECALL

ECALLs provide system-level functionalities to the guest program.

When ECALL is executed, it is assumed that: - register A7 contains the system call number

  • the arguments are located in registers A0-A6, and - the return value is written to A0, where A0-A7 are symbolic names for the registers x10-x17

ECALL number overview

We provide a list of supported ECALL numbers. Negative numbers (represented as 2s complement 64-bit numbers), are used for our own custom accelerators/extensions.

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