target/loongarch: Add LA64 & VA32 to DisasContext

Add LA64 and VA32(32-bit Virtual Address) to DisasContext to allow the
translator to reject doubleword instructions in LA32 mode for example.

Signed-off-by: Jiajie Chen <c@jia.je>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Message-ID: <20230822032724.1353391-5-gaosong@loongson.cn>
Message-Id: <20230822071405.35386-5-philmd@linaro.org>

target/loongarch/cpu.h

@@ -432,13 +432,25 @@ static inline bool is_la64(CPULoongArchState *env)
     return FIELD_EX32(env->cpucfg[1], CPUCFG1, ARCH) == CPUCFG1_ARCH_LA64;
 }
 
+static inline bool is_va32(CPULoongArchState *env)
+{
+    /* VA32 if !LA64 or VA32L[1-3] */
+    bool va32 = !is_la64(env);
+    uint64_t plv = FIELD_EX64(env->CSR_CRMD, CSR_CRMD, PLV);
+    if (plv >= 1 && (FIELD_EX64(env->CSR_MISC, CSR_MISC, VA32) & (1 << plv))) {
+        va32 = true;
+    }
+    return va32;
+}
+
 /*
  * LoongArch CPUs hardware flags.
  */
 #define HW_FLAGS_PLV_MASK   R_CSR_CRMD_PLV_MASK  /* 0x03 */
 #define HW_FLAGS_CRMD_PG    R_CSR_CRMD_PG_MASK   /* 0x10 */
 #define HW_FLAGS_EUEN_FPE   0x04
 #define HW_FLAGS_EUEN_SXE   0x08
+#define HW_FLAGS_VA32       0x20
 
 static inline void cpu_get_tb_cpu_state(CPULoongArchState *env, vaddr *pc,
                                         uint64_t *cs_base, uint32_t *flags)
@@ -448,6 +460,7 @@ static inline void cpu_get_tb_cpu_state(CPULoongArchState *env, vaddr *pc,
     *flags = env->CSR_CRMD & (R_CSR_CRMD_PLV_MASK | R_CSR_CRMD_PG_MASK);
     *flags |= FIELD_EX64(env->CSR_EUEN, CSR_EUEN, FPE) * HW_FLAGS_EUEN_FPE;
     *flags |= FIELD_EX64(env->CSR_EUEN, CSR_EUEN, SXE) * HW_FLAGS_EUEN_SXE;
+    *flags |= is_va32(env) * HW_FLAGS_VA32;
 }
 
 void loongarch_cpu_list(void);

target/loongarch/translate.c

@@ -119,6 +119,9 @@ static void loongarch_tr_init_disas_context(DisasContextBase *dcbase,
         ctx->vl = LSX_LEN;
     }
 
+    ctx->la64 = is_la64(env);
+    ctx->va32 = (ctx->base.tb->flags & HW_FLAGS_VA32) != 0;
+
     ctx->zero = tcg_constant_tl(0);
 }
 

target/loongarch/translate.h

@@ -33,6 +33,8 @@ typedef struct DisasContext {
     uint16_t plv;
     int vl;   /* Vector length */
     TCGv zero;
+    bool la64; /* LoongArch64 mode */
+    bool va32; /* 32-bit virtual address */
 } DisasContext;
 
 void generate_exception(DisasContext *ctx, int excp);