[PATCH v3] target/riscv: add support for zmmul extension v0.1

[Weiwei Li <liweiwei@iscas.ac.cn>]

 - includes all multiplication operations for M extension

Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn>
Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn>
Reviewed-by: Víctor Colombo <victor.colombo@eldorado.org.br>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

v2:
* disable M when both M and Zmmul are enabled

v3:
* add reviewed-by info, rebase to upstream/master

---
 target/riscv/cpu.c                      |  7 +++++++
 target/riscv/cpu.h                      |  1 +
 target/riscv/insn_trans/trans_rvm.c.inc | 18 ++++++++++++------
 3 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index a91253d4bd..bcbba3fbd5 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -600,6 +600,11 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
             cpu->cfg.ext_ifencei = true;
         }
 
+        if (cpu->cfg.ext_m && cpu->cfg.ext_zmmul) {
+            warn_report("Zmmul will override M");
+            cpu->cfg.ext_m = false;
+        }
+
         if (cpu->cfg.ext_i && cpu->cfg.ext_e) {
             error_setg(errp,
                        "I and E extensions are incompatible");
@@ -905,6 +910,7 @@ static Property riscv_cpu_properties[] = {
 
     /* These are experimental so mark with 'x-' */
     DEFINE_PROP_BOOL("x-j", RISCVCPU, cfg.ext_j, false),
+    DEFINE_PROP_BOOL("x-zmmul", RISCVCPU, cfg.ext_zmmul, false),
     /* ePMP 0.9.3 */
     DEFINE_PROP_BOOL("x-epmp", RISCVCPU, cfg.epmp, false),
     DEFINE_PROP_BOOL("x-aia", RISCVCPU, cfg.aia, false),
@@ -1031,6 +1037,7 @@ static void riscv_isa_string_ext(RISCVCPU *cpu, char **isa_str, int max_str_len)
     struct isa_ext_data isa_edata_arr[] = {
         ISA_EDATA_ENTRY(zicsr, ext_icsr),
         ISA_EDATA_ENTRY(zifencei, ext_ifencei),
+        ISA_EDATA_ENTRY(zmmul, ext_zmmul),
         ISA_EDATA_ENTRY(zfh, ext_zfh),
         ISA_EDATA_ENTRY(zfhmin, ext_zfhmin),
         ISA_EDATA_ENTRY(zfinx, ext_zfinx),
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index f08c3e8813..890d33cebb 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -411,6 +411,7 @@ struct RISCVCPUConfig {
     bool ext_zhinxmin;
     bool ext_zve32f;
     bool ext_zve64f;
+    bool ext_zmmul;
 
     uint32_t mvendorid;
     uint64_t marchid;
diff --git a/target/riscv/insn_trans/trans_rvm.c.inc b/target/riscv/insn_trans/trans_rvm.c.inc
index 16b029edf0..ec7f705aab 100644
--- a/target/riscv/insn_trans/trans_rvm.c.inc
+++ b/target/riscv/insn_trans/trans_rvm.c.inc
@@ -18,6 +18,12 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define REQUIRE_M_OR_ZMMUL(ctx) do {                      \
+    if (!ctx->cfg_ptr->ext_zmmul && !has_ext(ctx, RVM)) { \
+        return false;                                     \
+    }                                                     \
+} while (0)
+
 static void gen_mulhu_i128(TCGv r2, TCGv r3, TCGv al, TCGv ah, TCGv bl, TCGv bh)
 {
     TCGv tmpl = tcg_temp_new();
@@ -65,7 +71,7 @@ static void gen_mul_i128(TCGv rl, TCGv rh,
 
 static bool trans_mul(DisasContext *ctx, arg_mul *a)
 {
-    REQUIRE_EXT(ctx, RVM);
+    REQUIRE_M_OR_ZMMUL(ctx);
     return gen_arith(ctx, a, EXT_NONE, tcg_gen_mul_tl, gen_mul_i128);
 }
 
@@ -109,7 +115,7 @@ static void gen_mulh_w(TCGv ret, TCGv s1, TCGv s2)
 
 static bool trans_mulh(DisasContext *ctx, arg_mulh *a)
 {
-    REQUIRE_EXT(ctx, RVM);
+    REQUIRE_M_OR_ZMMUL(ctx);
     return gen_arith_per_ol(ctx, a, EXT_SIGN, gen_mulh, gen_mulh_w,
                             gen_mulh_i128);
 }
@@ -161,7 +167,7 @@ static void gen_mulhsu_w(TCGv ret, TCGv arg1, TCGv arg2)
 
 static bool trans_mulhsu(DisasContext *ctx, arg_mulhsu *a)
 {
-    REQUIRE_EXT(ctx, RVM);
+    REQUIRE_M_OR_ZMMUL(ctx);
     return gen_arith_per_ol(ctx, a, EXT_NONE, gen_mulhsu, gen_mulhsu_w,
                             gen_mulhsu_i128);
 }
@@ -176,7 +182,7 @@ static void gen_mulhu(TCGv ret, TCGv s1, TCGv s2)
 
 static bool trans_mulhu(DisasContext *ctx, arg_mulhu *a)
 {
-    REQUIRE_EXT(ctx, RVM);
+    REQUIRE_M_OR_ZMMUL(ctx);
     /* gen_mulh_w works for either sign as input. */
     return gen_arith_per_ol(ctx, a, EXT_ZERO, gen_mulhu, gen_mulh_w,
                             gen_mulhu_i128);
@@ -349,7 +355,7 @@ static bool trans_remu(DisasContext *ctx, arg_remu *a)
 static bool trans_mulw(DisasContext *ctx, arg_mulw *a)
 {
     REQUIRE_64_OR_128BIT(ctx);
-    REQUIRE_EXT(ctx, RVM);
+    REQUIRE_M_OR_ZMMUL(ctx);
     ctx->ol = MXL_RV32;
     return gen_arith(ctx, a, EXT_NONE, tcg_gen_mul_tl, NULL);
 }
@@ -389,7 +395,7 @@ static bool trans_remuw(DisasContext *ctx, arg_remuw *a)
 static bool trans_muld(DisasContext *ctx, arg_muld *a)
 {
     REQUIRE_128BIT(ctx);
-    REQUIRE_EXT(ctx, RVM);
+    REQUIRE_M_OR_ZMMUL(ctx);
     ctx->ol = MXL_RV64;
     return gen_arith(ctx, a, EXT_SIGN, tcg_gen_mul_tl, NULL);
 }
-- 
2.17.1