ECALL

Environment Call

ECALL

Generates an environment call exception (system call).

Encoding

Binary Layout

00000000000000000000000001110011

31:0

 

Format I-Type

Opcode 0x00000073

Extension RV32I

Operands

Related

Across architectures

System Call : how x86, ARM, RISC-V, and PowerISA each do this.

More in RV32I

Reference

View in RISC-V Unprivileged ISA Specification ↗ RISC-V ISA Manual

Description

ECALL makes a service request to the execution environment. It generates an environment-call exception, whose handling depends on the privilege level (U, S, or M).

Operation

RaiseException(EnvironmentCall);