MIPS: Emulate the new MIPS R6 BALC instruction

MIPS R6 uses the <R6 swc2 opcode for the new BALC instructions.

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

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 37c752757346..1f28724d23e5 100644
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -789,6 +789,16 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
                 }
                 regs->cp0_epc += 8;
                 break;
+        case balc6_op:
+                if (!cpu_has_mips_r6) {
+                        ret = -SIGILL;
+                        break;
+                }
+                /* Compact branch: BALC */
+                regs->regs[31] = epc + 4;
+                epc += 4 + (insn.i_format.simmediate << 2);
+                regs->cp0_epc = epc;
+                break;
 #endif
         case cbcond0_op:
         case cbcond1_op: