From: Aleksandar Markovic <amarkovic@wavecomp.com>

Clean up handling of CP0 register 4.

Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Message-Id: <1567009614-12438-6-git-send-email-aleksandar.markovic@rt-rk.com>
---
 target/mips/cpu.h       |  2 ++
 target/mips/translate.c | 36 ++++++++++++++++++++----------------
 2 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/target/mips/cpu.h b/target/mips/cpu.h
index d5b7103..496872e 100644
--- a/target/mips/cpu.h
+++ b/target/mips/cpu.h
@@ -305,7 +305,9 @@ typedef struct mips_def_t mips_def_t;
 #define CP0_REG03__TCOPT           7
 /* CP0 Register 04 */
 #define CP0_REG04__CONTEXT         0
+#define CP0_REG04__CONTEXTCONFIG   1
 #define CP0_REG04__USERLOCAL       2
+#define CP0_REG04__XCONTEXTCONFIG  3
 #define CP0_REG04__DBGCONTEXTID    4
 #define CP0_REG00__MMID            5
 /* CP0 Register 05 */
diff --git a/target/mips/translate.c b/target/mips/translate.c
index 059f53e..9df59f1 100644
--- a/target/mips/translate.c
+++ b/target/mips/translate.c
@@ -6975,16 +6975,17 @@ static void gen_mfc0(DisasContext *ctx, TCGv arg, int reg, int sel)
         break;
     case CP0_REGISTER_04:
         switch (sel) {
-        case 0:
+        case CP0_REG04__CONTEXT:
             tcg_gen_ld_tl(arg, cpu_env, offsetof(CPUMIPSState, CP0_Context));
             tcg_gen_ext32s_tl(arg, arg);
             register_name = "Context";
             break;
-        case 1:
-            /* gen_helper_mfc0_contextconfig(arg); - SmartMIPS ASE */
+        case CP0_REG04__CONTEXTCONFIG:
+            /* SmartMIPS ASE */
+            /* gen_helper_mfc0_contextconfig(arg); */
             register_name = "ContextConfig";
             goto cp0_unimplemented;
-        case 2:
+        case CP0_REG04__USERLOCAL:
             CP0_CHECK(ctx->ulri);
             tcg_gen_ld_tl(arg, cpu_env,
                           offsetof(CPUMIPSState, active_tc.CP0_UserLocal));
@@ -7710,15 +7711,16 @@ static void gen_mtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
         break;
     case CP0_REGISTER_04:
         switch (sel) {
-        case 0:
+        case CP0_REG04__CONTEXT:
             gen_helper_mtc0_context(cpu_env, arg);
             register_name = "Context";
             break;
-        case 1:
-//            gen_helper_mtc0_contextconfig(cpu_env, arg); /* SmartMIPS ASE */
+        case CP0_REG04__CONTEXTCONFIG:
+            /* SmartMIPS ASE */
+            /* gen_helper_mtc0_contextconfig(arg); */
             register_name = "ContextConfig";
             goto cp0_unimplemented;
-        case 2:
+        case CP0_REG04__USERLOCAL:
             CP0_CHECK(ctx->ulri);
             tcg_gen_st_tl(arg, cpu_env,
                           offsetof(CPUMIPSState, active_tc.CP0_UserLocal));
@@ -8455,15 +8457,16 @@ static void gen_dmfc0(DisasContext *ctx, TCGv arg, int reg, int sel)
         break;
     case CP0_REGISTER_04:
         switch (sel) {
-        case 0:
+        case CP0_REG04__CONTEXT:
             tcg_gen_ld_tl(arg, cpu_env, offsetof(CPUMIPSState, CP0_Context));
             register_name = "Context";
             break;
-        case 1:
-//            gen_helper_dmfc0_contextconfig(arg); /* SmartMIPS ASE */
+        case CP0_REG04__CONTEXTCONFIG:
+            /* SmartMIPS ASE */
+            /* gen_helper_dmfc0_contextconfig(arg); */
             register_name = "ContextConfig";
             goto cp0_unimplemented;
-        case 2:
+        case CP0_REG04__USERLOCAL:
             CP0_CHECK(ctx->ulri);
             tcg_gen_ld_tl(arg, cpu_env,
                           offsetof(CPUMIPSState, active_tc.CP0_UserLocal));
@@ -9168,15 +9171,16 @@ static void gen_dmtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
         break;
     case CP0_REGISTER_04:
         switch (sel) {
-        case 0:
+        case CP0_REG04__CONTEXT:
             gen_helper_mtc0_context(cpu_env, arg);
             register_name = "Context";
             break;
-        case 1:
-//           gen_helper_mtc0_contextconfig(cpu_env, arg); /* SmartMIPS ASE */
+        case CP0_REG04__CONTEXTCONFIG:
+            /* SmartMIPS ASE */
+            /* gen_helper_dmtc0_contextconfig(arg); */
             register_name = "ContextConfig";
             goto cp0_unimplemented;
-        case 2:
+        case CP0_REG04__USERLOCAL:
             CP0_CHECK(ctx->ulri);
             tcg_gen_st_tl(arg, cpu_env,
                           offsetof(CPUMIPSState, active_tc.CP0_UserLocal));
-- 
2.7.4