Re: [PATCH RFC 59/67] MIPS: kernel: branch: Emulate the BEQZC and JIC instructions

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On 12/18/2014 6:10 PM, Markos Chandras wrote:

MIPS R6 uses the <R6 ldc2 opcode for the new BEQZC and JIC instructions

Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
---
  arch/mips/kernel/branch.c | 9 +++++++++
  1 file changed, 9 insertions(+)

diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 426f876403d0..4473c23cacf2 100644
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -802,6 +802,15 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
  		epc = epc + 4 + (insn.i_format.simmediate << 2);
  		regs->cp0_epc = epc;
  		break;
+	case ldc2_or_bzcjic_op:
+		/* Compact branch: BEQZC || JIC */
+		if (insn.i_format.rs) /* BEQZC */
+			epc = epc + 8;

			epc += 8;

[...]

WBR, Sergei






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