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

Add the missing implied rule for standard B extension.
Standard B extension implies Zba, Zbb, Zbs extensions.

RISC-V B spec: https://github.com/riscv/riscv-b

Signed-off-by: Frank Chang <frank.ch...@sifive.com>
Reviewed-by: Jerry Zhang Jian <jerry.zhangj...@sifive.com>
Reviewed-by: Jim Shu <jim....@sifive.com>
---
 target/riscv/cpu.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 27edd5af62..f737b703da 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -2532,6 +2532,17 @@ static RISCVCPUImpliedExtsRule RVG_IMPLIED = {
     },
 };
 
+static RISCVCPUImpliedExtsRule RVB_IMPLIED = {
+    .is_misa = true,
+    .ext = RVB,
+    .implied_multi_exts = {
+        CPU_CFG_OFFSET(ext_zba), CPU_CFG_OFFSET(ext_zbb),
+        CPU_CFG_OFFSET(ext_zbs),
+
+        RISCV_IMPLIED_EXTS_RULE_END
+    },
+};
+
 static RISCVCPUImpliedExtsRule ZCB_IMPLIED = {
     .ext = CPU_CFG_OFFSET(ext_zcb),
     .implied_multi_exts = {
@@ -2910,7 +2921,8 @@ static RISCVCPUImpliedExtsRule SSCTR_IMPLIED = {
 
 RISCVCPUImpliedExtsRule *riscv_misa_ext_implied_rules[] = {
     &RVA_IMPLIED, &RVD_IMPLIED, &RVF_IMPLIED,
-    &RVM_IMPLIED, &RVV_IMPLIED, &RVG_IMPLIED, NULL
+    &RVM_IMPLIED, &RVV_IMPLIED, &RVG_IMPLIED,
+    &RVB_IMPLIED, NULL
 };
 
 RISCVCPUImpliedExtsRule *riscv_multi_ext_implied_rules[] = {
-- 
2.49.0


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