From 10d962d5342e84630b258dbd89668c359549b5b5 Mon Sep 17 00:00:00 2001
From: Markos Chandras <markos.chandras@imgtec.com>
Date: Wed, 26 Nov 2014 15:03:54 +0000
Subject: [PATCH] MIPS: Emulate the new MIPS R6 BNVC, BNEC and BNEZLAC
instructions
MIPS R6 uses the <R6 DADDI opcode for the new BNVC, BNEC and
BNEZLAC instructions.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
---
arch/mips/include/uapi/asm/inst.h | 2 +-
arch/mips/kernel/branch.c | 6 +++++-
arch/mips/math-emu/cp1emu.c | 1 +
3 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/mips/include/uapi/asm/inst.h b/arch/mips/include/uapi/asm/inst.h
index 782af0f83421..78335414b18a 100644
--- a/arch/mips/include/uapi/asm/inst.h
+++ b/arch/mips/include/uapi/asm/inst.h
@@ -25,7 +25,7 @@ enum major_op {
andi_op, ori_op, xori_op, lui_op,
cop0_op, cop1_op, cop2_op, cop1x_op,
beql_op, bnel_op, blezl_op, bgtzl_op,
- daddi_op, daddiu_op, ldl_op, ldr_op,
+ daddi_op, cbcond1_op = daddi_op, daddiu_op, ldl_op, ldr_op,
spec2_op, jalx_op, mdmx_op, spec3_op,
lb_op, lh_op, lwl_op, lw_op,
lbu_op, lhu_op, lwr_op, lwu_op,
diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 80a073ced200..37c752757346 100644
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -791,12 +791,16 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
break;
#endif
case cbcond0_op:
+ case cbcond1_op:
/* Only valid for MIPS R6 */
if (!cpu_has_mips_r6) {
ret = -SIGILL;
break;
}
- /* Compact branches: bovc, beqc, beqzalc */
+ /*
+ * Compact branches:
+ * bovc, beqc, beqzalc, bnvc, bnec, bnezlac
+ */
if (insn.i_format.rt && !insn.i_format.rs)
regs->regs[31] = epc + 4;
regs->cp0_epc += 8;
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index c115d969664b..0d8407b51470 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -624,6 +624,7 @@ static int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
dec_insn.next_pc_inc;
return 1;
case cbcond0_op:
+ case cbcond1_op:
if (!cpu_has_mips_r6)
break;
if (insn.i_format.rt && !insn.i_format.rs)
--
2.34.1