c.lwsp

Load word from stack pointer

Loads a 32-bit value from memory into register xd. It computes an effective address by adding the zero-extended offset, scaled by 4, to the stack pointer, x2. It expands to lw xd, offset(x2). C.LWSP is only valid when xd ≠ x0. The code points with xd=x0 are reserved.

Assembly format

c.lwsp xd, imm(sp)

Decode Variables

Bits<8> imm = {$encoding[3:2], $encoding[12], $encoding[6:4], 2'd0};
Bits<5> xd = $encoding[11:7];

Execution

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

Exceptions

This instruction may result in the following synchronous exceptions:

  • IllegalInstruction

  • LoadAccessFault

  • LoadAddressMisaligned

  • LoadPageFault

Encoding

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Defining extension

Zca

Access

M

Always

Containing profiles

  • Mandatory: None

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