MIPS: Emulate the new MIPS R6 BNVC, BNEC and BNEZLAC instructions

MIPS R6 uses the <R6 DADDI opcode for the new BNVC, BNEC and
BNEZLAC instructions.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>

arch/mips/include/uapi/asm/inst.h

@@ -25,7 +25,7 @@ enum major_op {
 	andi_op, ori_op, xori_op, lui_op,
 	cop0_op, cop1_op, cop2_op, cop1x_op,
 	beql_op, bnel_op, blezl_op, bgtzl_op,
-	daddi_op, daddiu_op, ldl_op, ldr_op,
+	daddi_op, cbcond1_op = daddi_op, daddiu_op, ldl_op, ldr_op,
 	spec2_op, jalx_op, mdmx_op, spec3_op,
 	lb_op, lh_op, lwl_op, lw_op,
 	lbu_op, lhu_op, lwr_op, lwu_op,

arch/mips/kernel/branch.c

@@ -791,12 +791,16 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
 		break;
 #endif
 	case cbcond0_op:
+	case cbcond1_op:
 		/* Only valid for MIPS R6 */
 		if (!cpu_has_mips_r6) {
 			ret = -SIGILL;
 			break;
 		}
-		/* Compact branches: bovc, beqc, beqzalc */
+		/*
+		 * Compact branches:
+		 * bovc, beqc, beqzalc, bnvc, bnec, bnezlac
+		 */
 		if (insn.i_format.rt && !insn.i_format.rs)
 			regs->regs[31] = epc + 4;
 		regs->cp0_epc += 8;

arch/mips/math-emu/cp1emu.c

@@ -624,6 +624,7 @@ static int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
 				dec_insn.next_pc_inc;
 		return 1;
 	case cbcond0_op:
+	case cbcond1_op:
 		if (!cpu_has_mips_r6)
 			break;
 		if (insn.i_format.rt && !insn.i_format.rs)