c.jr

Jump Register

This instruction is defined by:

Encoding

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Synopsis

C.JR (jump register) performs an unconditional control transfer to the address in register xs1. C.JR expands to jalr x0, 0(xs1).

Access

M HS U VS VU

Always

Always

Always

Always

Always

Decode Variables

Bits<5> xs1 = $encoding[11:7];

Execution

  • Pruned, XLEN == 64

  • Original

if ((CSR[misa].C == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
jump(X[xs1]);
if (implemented?(ExtensionName::C) && (CSR[misa].C == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
jump(X[xs1]);

Exceptions

This instruction may result in the following synchronous exceptions:

  • IllegalInstruction

  • InstructionAddressMisaligned