target/riscv: add support for Zcf extension

Separate c_flw/c_fsw from flw/fsw to add check for Zcf extension.

Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230307081403.61950-4-liweiwei@iscas.ac.cn>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/insn16.decode

@@ -109,11 +109,11 @@ sw                110  ... ... .. ... 00 @cs_w
 # *** RV32C and RV64C specific Standard Extension (Quadrant 0) ***
 {
   ld              011  ... ... .. ... 00 @cl_d
-  flw             011  ... ... .. ... 00 @cl_w
+  c_flw           011  ... ... .. ... 00 @cl_w
 }
 {
   sd              111  ... ... .. ... 00 @cs_d
-  fsw             111  ... ... .. ... 00 @cs_w
+  c_fsw           111  ... ... .. ... 00 @cs_w
 }
 
 # *** RV32/64C Standard Extension (Quadrant 1) ***
@@ -174,9 +174,9 @@ sw                110 .  .....  ..... 10 @c_swsp
 {
   c64_illegal     011 -  00000  ----- 10 # c.ldsp, RES rd=0
   ld              011 .  .....  ..... 10 @c_ldsp
-  flw             011 .  .....  ..... 10 @c_lwsp
+  c_flw           011 .  .....  ..... 10 @c_lwsp
 }
 {
   sd              111 .  .....  ..... 10 @c_sdsp
-  fsw             111 .  .....  ..... 10 @c_swsp
+  c_fsw           111 .  .....  ..... 10 @c_swsp
 }

target/riscv/insn_trans/trans_rvf.c.inc

@@ -30,6 +30,12 @@
     } \
 } while (0)
 
+#define REQUIRE_ZCF(ctx) do {                  \
+    if (!ctx->cfg_ptr->ext_zcf) {              \
+        return false;                          \
+    }                                          \
+} while (0)
+
 static bool trans_flw(DisasContext *ctx, arg_flw *a)
 {
     TCGv_i64 dest;
@@ -61,6 +67,18 @@ static bool trans_fsw(DisasContext *ctx, arg_fsw *a)
     return true;
 }
 
+static bool trans_c_flw(DisasContext *ctx, arg_flw *a)
+{
+    REQUIRE_ZCF(ctx);
+    return trans_flw(ctx, a);
+}
+
+static bool trans_c_fsw(DisasContext *ctx, arg_fsw *a)
+{
+    REQUIRE_ZCF(ctx);
+    return trans_fsw(ctx, a);
+}
+
 static bool trans_fmadd_s(DisasContext *ctx, arg_fmadd_s *a)
 {
     REQUIRE_FPU;