jalr

Jump and link register

This instruction is defined by:

Encoding

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Synopsis

Jump to an address formed by adding rs1 to a signed offset, and store the return address in rd.

Access

M

HS

U

VS

VU

Always

Always

Always

Always

Always

Decode Variables

Bits<12> imm = $encoding[31:20];
Bits<5> rs1 = $encoding[19:15];
Bits<5> rd = $encoding[11:7];

Execution

  • Pruned, XLEN == 64

  • Original

XReg returnaddr;
returnaddr = $pc + 4;
jump(X[rs1] + imm);
X[rd] = returnaddr;
XReg returnaddr;
returnaddr = $pc + 4;
jump(X[rs1] + imm);
X[rd] = returnaddr;

Exceptions

This instruction may result in the following synchronous exceptions:

  • InstructionAddressMisaligned