Function store_fp

crates/virtual-machine/src/cpu/pipeline/memory.rs:331–345

(bus: &mut SystemBus, addr: u64, bits: u64, funct3: u8)

    addr: u64,
    val: u64,
) -> Result<u64, VmError> {
    let is_word = funct3 == 2;

    // Natural alignment is required for all atomics: 4-byte for .W, 8-byte for .D.
    let align = if is_word { 4u64 } else { 8u64 };
    if !addr.is_multiple_of(align) {
        return Err(VmError::StoreAccessFault(addr));
    }

    match funct5 {
        // LR
        0x02 => {
            *reservation = Some(addr);
            let result = if is_word {
                let w = bus
                    .read_word(addr)
                    .map_err(|_| VmError::LoadAccessFault(addr))?;
                (w as i32) as i64 as u64