[PATCH v4 07/11] target/loongarch: Add LA32 & VA32 to DisasContext

[Jiajie Chen <c@jia.je>]

Add LA32 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>
---
 target/loongarch/cpu.h       | 9 +++++++++
 target/loongarch/translate.c | 3 +++
 target/loongarch/translate.h | 2 ++
 3 files changed, 14 insertions(+)

diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index 396869c3b6..69589f0aef 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -445,15 +445,24 @@ static inline int cpu_mmu_index(CPULoongArchState *env, bool ifetch)
 #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)
 {
+    /* VA32 if LA32 or VA32L[1-3] */
+    uint32_t va32 = LOONGARCH_CPUCFG_ARCH(env, LA32);
+    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 = 1;
+    }
+
     *pc = env->pc;
     *cs_base = 0;
     *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 |= va32 * HW_FLAGS_VA32;
 }
 
 void loongarch_cpu_list(void);
diff --git a/target/loongarch/translate.c b/target/loongarch/translate.c
index 3146a2d4ac..f1e5fe4cf8 100644
--- a/target/loongarch/translate.c
+++ b/target/loongarch/translate.c
@@ -119,6 +119,9 @@ static void loongarch_tr_init_disas_context(DisasContextBase *dcbase,
         ctx->vl = LSX_LEN;
     }
 
+    ctx->la32 = LOONGARCH_CPUCFG_ARCH(env, LA32);
+    ctx->va32 = (ctx->base.tb->flags & HW_FLAGS_VA32) != 0;
+
     ctx->zero = tcg_constant_tl(0);
 }
 
diff --git a/target/loongarch/translate.h b/target/loongarch/translate.h
index 7f60090580..828f1185d2 100644
--- a/target/loongarch/translate.h
+++ b/target/loongarch/translate.h
@@ -33,6 +33,8 @@ typedef struct DisasContext {
     uint16_t plv;
     int vl;   /* Vector length */
     TCGv zero;
+    bool la32; /* LoongArch32 mode */
+    bool va32; /* 32-bit virtual address */
 } DisasContext;
 
 void generate_exception(DisasContext *ctx, int excp);
-- 
2.41.0