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authorMarkos Chandras <markos.chandras@imgtec.com>2015-01-08 11:55:20 +0000
committerMarkos Chandras <markos.chandras@imgtec.com>2015-02-17 15:37:35 +0000
commit28d6f93d201d20ce47a9e8414655569a78f0353c (patch)
tree6e5465688702428258d063ab763a33f685d8dc1a /arch/mips
parent69b9a2fd05a308b9b1e1f282f3b772491603c582 (diff)
MIPS: Emulate the new MIPS R6 BNEZC and JIALC instructions
MIPS R6 uses the <R6 sdc2 opcode for the new BNEZC and JIALC instructions Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/include/uapi/asm/inst.h2
-rw-r--r--arch/mips/kernel/branch.c10
-rw-r--r--arch/mips/math-emu/cp1emu.c9
3 files changed, 20 insertions, 1 deletions
diff --git a/arch/mips/include/uapi/asm/inst.h b/arch/mips/include/uapi/asm/inst.h
index 721f8fe705a4..fc0cf5ac0cf7 100644
--- a/arch/mips/include/uapi/asm/inst.h
+++ b/arch/mips/include/uapi/asm/inst.h
@@ -34,7 +34,7 @@ enum major_op {
ll_op, lwc1_op, lwc2_op, bc6_op = lwc2_op, pref_op,
lld_op, ldc1_op, ldc2_op, beqzcjic_op = ldc2_op, ld_op,
sc_op, swc1_op, swc2_op, balc6_op = swc2_op, major_3b_op,
- scd_op, sdc1_op, sdc2_op, sd_op
+ scd_op, sdc1_op, sdc2_op, bnezcjialc_op = sdc2_op, sd_op
};
/*
diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index c61a41df3363..249c61c9acf1 100644
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -807,6 +807,16 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
/* Compact branch: BEQZC || JIC */
regs->cp0_epc += 8;
break;
+ case bnezcjialc_op:
+ if (!cpu_has_mips_r6) {
+ ret = -SIGILL;
+ break;
+ }
+ /* Compact branch: BNEZC || JIALC */
+ if (insn.i_format.rs)
+ regs->regs[31] = epc + 4;
+ regs->cp0_epc += 8;
+ break;
#endif
case cbcond0_op:
case cbcond1_op:
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index f00af84f017d..6e7920b20822 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -686,6 +686,15 @@ static int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
dec_insn.next_pc_inc;
return 1;
+ case bnezcjialc_op:
+ if (!cpu_has_mips_r6)
+ break;
+ if (!insn.i_format.rs)
+ regs->regs[31] = regs->cp0_epc + 4;
+ *contpc = regs->cp0_epc + dec_insn.pc_inc +
+ dec_insn.next_pc_inc;
+
+ return 1;
#endif
case cop0_op:
case cop1_op: