[PATCH v4 04/11] disas/riscv: Support zcmop disassemble

[LIU Zhiwei]

Although in QEMU disassemble, we usually lift compressed instruction
to an normal format when display the instruction name. For C.MOP.n,
it is more reasonable to directly display its compressed name, because
its behavior can be redefined by later extension.

Signed-off-by: LIU Zhiwei <zhiwei_...@linux.alibaba.com>
Acked-by: Alistair Francis <alistair.fran...@wdc.com>
Reviewed-by: Deepak Gupta <de...@rivosinc.com>
---
 disas/riscv.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/disas/riscv.c b/disas/riscv.c
index 0b82ab2322..d29cb1ff7d 100644
--- a/disas/riscv.c
+++ b/disas/riscv.c
@@ -946,6 +946,14 @@ typedef enum {
     rv_mop_rr_5    = 915,
     rv_mop_rr_6    = 916,
     rv_mop_rr_7    = 917,
+    rv_c_mop_1     = 918,
+    rv_c_mop_3     = 919,
+    rv_c_mop_5     = 920,
+    rv_c_mop_7     = 921,
+    rv_c_mop_9     = 922,
+    rv_c_mop_11    = 923,
+    rv_c_mop_13    = 924,
+    rv_c_mop_15    = 925,
 } rv_op;
 
 /* register names */
@@ -2176,6 +2184,14 @@ const rv_opcode_data rvi_opcode_data[] = {
     { "mop.rr.5", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
     { "mop.rr.6", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
     { "mop.rr.7", rv_codec_r, rv_fmt_rd_rs1_rs2, NULL, 0, 0, 0 },
+    { "c.mop.1",  rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
+    { "c.mop.3",  rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
+    { "c.mop.5",  rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
+    { "c.mop.7",  rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
+    { "c.mop.9",  rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
+    { "c.mop.11", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
+    { "c.mop.13", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
+    { "c.mop.15", rv_codec_ci_none, rv_fmt_none, NULL, 0, 0, 0 },
 };
 
 /* CSR names */
@@ -2532,6 +2548,13 @@ static void decode_inst_opcode(rv_decode *dec, rv_isa 
isa)
             break;
         case 2: op = rv_op_c_li; break;
         case 3:
+            if (dec->cfg->ext_zcmop) {
+                if ((((inst >> 2) & 0b111111) == 0b100000) &&
+                    (((inst >> 11) & 0b11) == 0b0)) {
+                    op = rv_c_mop_1 + ((inst >> 8) & 0b111);
+                    break;
+                }
+            }
             switch ((inst >> 7) & 0b11111) {
             case 2: op = rv_op_c_addi16sp; break;
             default: op = rv_op_c_lui; break;
-- 
2.25.1