MIPS: microMIPS: mfhc1 & mthc1 support for the FPU emulator

This patch adds support for microMIPS encodings of the mfhc1 & mthc1
instructions introduced in release 2 of the mips32 & mips64
architectures, converting them to their mips32 equivalents for the FPU
emulator.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6110/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 9 insertions, 1 deletions

diff --git a/arch/mips/include/uapi/asm/inst.h b/arch/mips/include/uapi/asm/inst.h
index 0ee96563e6f0..b39ba25b41cc 100644
--- a/arch/mips/include/uapi/asm/inst.h
+++ b/arch/mips/include/uapi/asm/inst.h
@@ -398,8 +398,10 @@ enum mm_32f_73_minor_op {
         mm_movt1_op = 0xa5,
         mm_ftruncw_op = 0xac,
         mm_fneg1_op = 0xad,
+        mm_mfhc1_op = 0xc0,
         mm_froundl_op = 0xcc,
         mm_fcvtd1_op = 0xcd,
+        mm_mthc1_op = 0xe0,
         mm_froundw_op = 0xec,
         mm_fcvts1_op = 0xed,
 };
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index aaf7c92f4629..0e47ae2aa96b 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -417,14 +417,20 @@ static int microMIPS32_to_MIPS32(union mips_instruction *insn_ptr)
                         case mm_mtc1_op:
                         case mm_cfc1_op:
                         case mm_ctc1_op:
+                        case mm_mfhc1_op:
+                        case mm_mthc1_op:
                                 if (insn.mm_fp1_format.op == mm_mfc1_op)
                                         op = mfc_op;
                                 else if (insn.mm_fp1_format.op == mm_mtc1_op)
                                         op = mtc_op;
                                 else if (insn.mm_fp1_format.op == mm_cfc1_op)
                                         op = cfc_op;
-                                else
+                                else if (insn.mm_fp1_format.op == mm_ctc1_op)
                                         op = ctc_op;
+                                else if (insn.mm_fp1_format.op == mm_mfhc1_op)
+                                        op = mfhc_op;
+                                else
+                                        op = mthc_op;
                                 mips32_insn.fp1_format.opcode = cop1_op;
                                 mips32_insn.fp1_format.op = op;
                                 mips32_insn.fp1_format.rt =