target/mips: Add emulation of nanoMIPS instructions MOVE.P and MOVE.PREV

Add emulation of nanoMIPS instructions MOVE.P and MOVE.PREV.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Yongbok Kim <yongbok.kim@mips.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Signed-off-by: Stefan Markovic <smarkovic@wavecomp.com>

1 files changed, 32 insertions, 1 deletions

diff --git a/target/mips/translate.c b/target/mips/translate.c
index cbe3779ee1..8bc08f742e 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -17438,8 +17438,39 @@ static int decode_nanomips_opc(CPUMIPSState *env, DisasContext *ctx)
         }
         break;
     case NM_MOVEP:
-        break;
     case NM_MOVEPREV:
+        {
+            static const int gpr2reg1[] = {4, 5, 6, 7};
+            static const int gpr2reg2[] = {5, 6, 7, 8};
+            int re;
+            int rd2 = extract32(ctx->opcode, 3, 1) << 1 |
+                      extract32(ctx->opcode, 8, 1);
+            int r1 = gpr2reg1[rd2];
+            int r2 = gpr2reg2[rd2];
+            int r3 = extract32(ctx->opcode, 4, 1) << 3 |
+                     extract32(ctx->opcode, 0, 3);
+            int r4 = extract32(ctx->opcode, 9, 1) << 3 |
+                     extract32(ctx->opcode, 5, 3);
+            TCGv t0 = tcg_temp_new();
+            TCGv t1 = tcg_temp_new();
+            if (op == NM_MOVEP) {
+                rd = r1;
+                re = r2;
+                rs = decode_gpr_gpr4_zero(r3);
+                rt = decode_gpr_gpr4_zero(r4);
+            } else {
+                rd = decode_gpr_gpr4(r3);
+                re = decode_gpr_gpr4(r4);
+                rs = r1;
+                rt = r2;
+            }
+            gen_load_gpr(t0, rs);
+            gen_load_gpr(t1, rt);
+            tcg_gen_mov_tl(cpu_gpr[rd], t0);
+            tcg_gen_mov_tl(cpu_gpr[re], t1);
+            tcg_temp_free(t0);
+            tcg_temp_free(t1);
+        }
         break;
     default:
         return decode_nanomips_32_48_opc(env, ctx);