target-mips: correct MTC0 instruction on MIPS64

MTC0 on a 64-bit processor should move entire 64-bit GPR content to CP0
register.

Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>

target-mips/translate.c

@@ -4765,12 +4765,6 @@ static inline void gen_mtc0_store32 (TCGv arg, target_ulong off)
     tcg_temp_free_i32(t0);
 }
 
-static inline void gen_mtc0_store64 (TCGv arg, target_ulong off)
-{
-    tcg_gen_ext32s_tl(arg, arg);
-    tcg_gen_st_tl(arg, cpu_env, off);
-}
-
 static void gen_mfhc0(DisasContext *ctx, TCGv arg, int reg, int sel)
 {
     const char *rn = "invalid";
@@ -5629,12 +5623,14 @@ static void gen_mtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
             break;
         case 5:
             CP0_CHECK(ctx->insn_flags & ASE_MT);
-            gen_mtc0_store64(arg, offsetof(CPUMIPSState, CP0_VPESchedule));
+            tcg_gen_st_tl(arg, cpu_env,
+                          offsetof(CPUMIPSState, CP0_VPESchedule));
             rn = "VPESchedule";
             break;
         case 6:
             CP0_CHECK(ctx->insn_flags & ASE_MT);
-            gen_mtc0_store64(arg, offsetof(CPUMIPSState, CP0_VPEScheFBack));
+            tcg_gen_st_tl(arg, cpu_env,
+                          offsetof(CPUMIPSState, CP0_VPEScheFBack));
             rn = "VPEScheFBack";
             break;
         case 7:
@@ -5884,7 +5880,7 @@ static void gen_mtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
     case 14:
         switch (sel) {
         case 0:
-            gen_mtc0_store64(arg, offsetof(CPUMIPSState, CP0_EPC));
+            tcg_gen_st_tl(arg, cpu_env, offsetof(CPUMIPSState, CP0_EPC));
             rn = "EPC";
             break;
         default:
@@ -6057,7 +6053,7 @@ static void gen_mtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
         switch (sel) {
         case 0:
             /* EJTAG support */
-            gen_mtc0_store64(arg, offsetof(CPUMIPSState, CP0_DEPC));
+            tcg_gen_st_tl(arg, cpu_env, offsetof(CPUMIPSState, CP0_DEPC));
             rn = "DEPC";
             break;
         default:
@@ -6160,7 +6156,7 @@ static void gen_mtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
     case 30:
         switch (sel) {
         case 0:
-            gen_mtc0_store64(arg, offsetof(CPUMIPSState, CP0_ErrorEPC));
+            tcg_gen_st_tl(arg, cpu_env, offsetof(CPUMIPSState, CP0_ErrorEPC));
             rn = "ErrorEPC";
             break;
         default: