CSRRS csr rs1 001 rd 1110011 CSRRS csr rs1 010 rd 1010011 FSGNJX.D 0010101 rs2 rs1 funct3 rd opcode R4-type imm[11:0] rs1 010 rd 0101111 AMOMAX.W 11000 aq rl rs2 rs1 funct3 rd opcode U-type imm[20|10:1|11|19:12] rd