MIPS: Compute branch returns for Cavium OCTEON specific branch instructions.

For Cavium OCTEON, compute the return epc value for OCTEON specific
branch instructions.

Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 6b5df8b..0176ed0 100644 (file)
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -205,6 +205,39 @@ int __compute_return_epc(struct pt_regs *regs)
                        break;
                }
                break;
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+       case lwc2_op: /* This is bbit0 on Octeon */
+               if ((regs->regs[insn.i_format.rs] & (1ull<<insn.i_format.rt))
+                    == 0)
+                       epc = epc + 4 + (insn.i_format.simmediate << 2);
+               else
+                       epc += 8;
+               regs->cp0_epc = epc;
+               break;
+       case ldc2_op: /* This is bbit032 on Octeon */
+               if ((regs->regs[insn.i_format.rs] &
+                   (1ull<<(insn.i_format.rt+32))) == 0)
+                       epc = epc + 4 + (insn.i_format.simmediate << 2);
+               else
+                       epc += 8;
+               regs->cp0_epc = epc;
+               break;
+       case swc2_op: /* This is bbit1 on Octeon */
+               if (regs->regs[insn.i_format.rs] & (1ull<<insn.i_format.rt))
+                       epc = epc + 4 + (insn.i_format.simmediate << 2);
+               else
+                       epc += 8;
+               regs->cp0_epc = epc;
+               break;
+       case sdc2_op: /* This is bbit132 on Octeon */
+               if (regs->regs[insn.i_format.rs] &
+                   (1ull<<(insn.i_format.rt+32)))
+                       epc = epc + 4 + (insn.i_format.simmediate << 2);
+               else
+                       epc += 8;
+               regs->cp0_epc = epc;
+               break;
+#endif
        }
 
        return 0;