c.swsp

Store word to stack

Stores a 32-bit value in register xs2 to memory. It computes an effective address by adding the zero-extended offset, scaled by 4, to the stack pointer, x2. It expands to sw xs2, offset(x2).

Assembly format

c.swsp xs2, imm(sp)

Decode Variables

Bits<8> imm = {$encoding[8:7], $encoding[12:9], 2'd0};
Bits<5> xs2 = $encoding[6:2];

Execution

if (implemented?(ExtensionName::C) && (CSR[misa].C == 1'b0)) {
  raise(ExceptionCode::IllegalInstruction, mode(), $encoding);
}
XReg virtual_address = X[2] + imm;
write_memory(32, virtual_address, X[xs2][31:0], $encoding);

Exceptions

This instruction may result in the following synchronous exceptions:

  • IllegalInstruction

  • LoadAccessFault

  • StoreAmoAccessFault

  • StoreAmoAddressMisaligned

  • StoreAmoPageFault

Encoding

svg

Defining extension

Zca

Access

M

Always

Containing profiles

  • Mandatory: None

  • Optional: RVA20S64, RVA20U64, RVA22S64, RVA22U64, RVA23S64, RVA23U64, RVB23S64, RVB23U64, RVI20U32, RVI20U64