FRCSR - RISC-V instruction reference

frcsrRead FP CSR Pseudo-instruction
Reads the FP control and status register (fcsr) into t1.
Also written as: frsr
Forms  frcsr   
Operands t1 Any integer register, x0 to x31, or its named alias, such as zero, t0 or t6. 
 # Initialize fcsr, then use frcsr to read its old value or update it.
.text
li t3, 0
csrw t3, fcsr
frcsr t1
# t1=0 because fcsr was cleared immediately above.