Commit 126336f0 authored by David Daney's avatar David Daney Committed by Ralf Baechle
Browse files

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: default avatarTomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: default avatarDavid Daney <ddaney@caviumnetworks.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 2a219b0e

arch/mips/kernel/branch.c

+33 −0
Original line number Diff line number Diff line
@@ -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;

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