floating-point support

[ConstArc]

I am trying to perform a simple pow function for doubles, within the kernel code, that involves floating-point multiplication. However, I get the following error at boot time:
scause=0x2 sepc=0x80001cf8 stval=0xcb507

From what I know riscv supports floating-point calculations, but I still get the scause=0x2 (Illegal Instruction Exception from what I have searched).