[PATCH v7 10/75] target/riscv: rvv-1.0: check MSTATUS_VS when accessing vector csr registers

[frank . chang]

From: Frank Chang <frank.chang@sifive.com>

If VS field is off, accessing vector csr registers should raise an
illegal-instruction exception.

Signed-off-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/csr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 92cf2eedd40..a6a535f7e33 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -48,6 +48,11 @@ static int fs(CPURISCVState *env, int csrno)
 static int vs(CPURISCVState *env, int csrno)
 {
     if (env->misa & RVV) {
+#if !defined(CONFIG_USER_ONLY)
+        if (!env->debugger && !riscv_cpu_vector_enabled(env)) {
+            return -RISCV_EXCP_ILLEGAL_INST;
+        }
+#endif
         return 0;
     }
     return -RISCV_EXCP_ILLEGAL_INST;
-- 
2.17.1