target/riscv: add "set round to odd" rounding mode helper function

helper_set_rounding_mode() is responsible for SIGILL, and "round to odd"
should be an interface private to translation, so add a new independent
helper_set_rod_rounding_mode().

Signed-off-by: Frank Chang <frank.chang@sifive.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20211210075704.23951-64-frank.chang@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 3688e80d03..b4df21bda3 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -30,6 +30,7 @@
 #include "exec/log.h"
 
 #include "instmap.h"
+#include "internals.h"
 
 /* global register indices */
 static TCGv cpu_gpr[32], cpu_pc, cpu_vl;
@@ -403,6 +404,12 @@ static void gen_set_rm(DisasContext *ctx, int rm)
         return;
     }
     ctx->frm = rm;
+
+    if (rm == RISCV_FRM_ROD) {
+        gen_helper_set_rod_rounding_mode(cpu_env);
+        return;
+    }
+
     gen_helper_set_rounding_mode(cpu_env, tcg_constant_i32(rm));
 }