From f1ca8de7217e6c3bcfc8e93db54258bd117b2151 Mon Sep 17 00:00:00 2001
From: "Tsukasa #01 (a4lg)" <research_trasio@irq.a4lg.com>
Date: Sat, 18 Dec 2021 04:28:37 +0900
Subject: Add disassembler support for `unimp' (#886)

Now it disassembles 0x0000 (invalid encoding of c.addi4spn) as c.unimp
(RVC).  Non-RVC variant of unimp pseudoinstruction (0xc0001073) is also
implemented.
---
 disasm/disasm.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/disasm/disasm.cc b/disasm/disasm.cc
index 54fdb48..9e26f0f 100644
--- a/disasm/disasm.cc
+++ b/disasm/disasm.cc
@@ -676,6 +676,9 @@ disassembler_t::disassembler_t(int xlen)
   #define DEFINE_XFTYPE(code) add_xftype_insn(this, #code, match_##code, mask_##code);
   #define DEFINE_SFENCE_TYPE(code) add_sfence_insn(this, #code, match_##code, mask_##code);
 
+  add_insn(new disasm_insn_t("unimp", match_csrrw|(CSR_CYCLE<<20), 0xffffffff, {}));
+  add_insn(new disasm_insn_t("c.unimp", 0, 0xffff, {}));
+
   DEFINE_XLOAD(lb)
   DEFINE_XLOAD(lbu)
   DEFINE_XLOAD(lh)
-- 
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