The profile support is handling multi-letter extensions only. Let's add
support for MISA bits as well.

We'll go through every known MISA bit. If the profile doesn't declare the bit
as mandatory, ignore it. Otherwise, set or clear the bit in env->misa_ext and
env->misa_ext_mask depending on whether the profile was set to 'true' or
'false'.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
 target/riscv/tcg/tcg-cpu.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c
index 5d96ccb45c..4f4bc58627 100644
--- a/target/riscv/tcg/tcg-cpu.c
+++ b/target/riscv/tcg/tcg-cpu.c
@@ -829,6 +829,19 @@ static void cpu_set_profile(Object *obj, Visitor *v, const char *name,
     profile->user_set = true;
     profile->enabled = value;
 
+    for (i = 0; misa_bits[i] != 0; i++) {
+        uint32_t bit = misa_bits[i];
+
+        if  (!(profile->misa_ext & bit)) {
+            continue;
+        }
+
+        g_hash_table_insert(misa_ext_user_opts,
+                            GUINT_TO_POINTER(bit),
+                            (gpointer)value);
+        riscv_cpu_write_misa_bit(cpu, bit, profile->enabled);
+    }
+
     for (i = 0; profile->ext_offsets[i] != RISCV_PROFILE_EXT_LIST_END; i++) {
         ext_offset = profile->ext_offsets[i];
 
-- 
2.41.0