Re: [PATCH RFC 58/67] MIPS: kernel: branch: Emulate the BALC R6 instruction

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

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

Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
---
  arch/mips/kernel/branch.c | 6 ++++++
  1 file changed, 6 insertions(+)

diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 4cc9070682e1..426f876403d0 100644
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -796,6 +796,12 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
  			regs->regs[31] = epc + 4;
  		regs->cp0_epc += 8;
  		break;
+	case swc2_or_balc_op:
+		/* Compact branch: BALC */
+		regs->regs[31] = epc + 4;
+		epc = epc + 4 + (insn.i_format.simmediate << 2);

		epc += 4 + (insn.i_format.simmediate << 2);

+		regs->cp0_epc = epc;
+		break;

WBR, Sergei






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