c.jal
Jump and Link
This instruction is defined by:
-
anyOf:
-
C, version >= 0
-
Zca, version >= 0
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This instruction is included in the following profiles:
Synopsis
C.JAL is an RV32C-only instruction that performs the same operation as C.J, but additionally writes the address of the instruction following the jump (pc+2) to the link register, x1.
It expands to jal x1, offset.
Decode Variables
signed Bits<12> imm = sext({$encoding[12], $encoding[8], $encoding[10:9], $encoding[6], $encoding[7], $encoding[2], $encoding[11], $encoding[5:3], 1'd0});Execution
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IDL
if (implemented?(ExtensionName::C) && (CSR[misa].C == 1'b0)) {
raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg retrun_addr = $pc + 2;
jump_halfword($pc + imm);
X[1] = retrun_addr;