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

Add MISA extension implied rules to enable the implied extensions
of MISA recursively.

Signed-off-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Jerry Zhang Jian <jerry.zhangjian@sifive.com>
---
 target/riscv/cpu.c | 50 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index c7e5cec7ef..a6e9055c5f 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -2242,8 +2242,56 @@ RISCVCPUProfile *riscv_profiles[] = {
     NULL,
 };

+static RISCVCPUImpliedExtsRule RVA_IMPLIED = {
+    .is_misa = true,
+    .ext = RVA,
+    .implied_exts = {
+        CPU_CFG_OFFSET(ext_zalrsc), CPU_CFG_OFFSET(ext_zaamo),
+
+        RISCV_IMPLIED_EXTS_RULE_END
+    },
+};
+
+static RISCVCPUImpliedExtsRule RVD_IMPLIED = {
+    .is_misa = true,
+    .ext = RVD,
+    .implied_misas = RVF,
+    .implied_exts = { RISCV_IMPLIED_EXTS_RULE_END },
+};
+
+static RISCVCPUImpliedExtsRule RVF_IMPLIED = {
+    .is_misa = true,
+    .ext = RVF,
+    .implied_exts = {
+        CPU_CFG_OFFSET(ext_zicsr),
+
+        RISCV_IMPLIED_EXTS_RULE_END
+    },
+};
+
+static RISCVCPUImpliedExtsRule RVM_IMPLIED = {
+    .is_misa = true,
+    .ext = RVM,
+    .implied_exts = {
+        CPU_CFG_OFFSET(ext_zmmul),
+
+        RISCV_IMPLIED_EXTS_RULE_END
+    },
+};
+
+static RISCVCPUImpliedExtsRule RVV_IMPLIED = {
+    .is_misa = true,
+    .ext = RVV,
+    .implied_exts = {
+        CPU_CFG_OFFSET(ext_zve64d),
+
+        RISCV_IMPLIED_EXTS_RULE_END
+    },
+};
+
 RISCVCPUImpliedExtsRule *riscv_misa_implied_rules[] = {
-    NULL
+    &RVA_IMPLIED, &RVD_IMPLIED, &RVF_IMPLIED,
+    &RVM_IMPLIED, &RVV_IMPLIED, NULL
 };

 RISCVCPUImpliedExtsRule *riscv_ext_implied_rules[] = {
--
2.43.2