Add flags for Zfinx/Zdinx/Zhinx{min}

Hardwire mstatus_fs to zero when enable ZFinx

riscv/csrs.cc

@@ -394,8 +394,8 @@ base_status_csr_t::base_status_csr_t(processor_t* const proc, const reg_t addr):
 reg_t base_status_csr_t::compute_sstatus_write_mask() const noexcept {
   // If a configuration has FS bits, they will always be accessible no
   // matter the state of misa.
-  const bool has_fs = proc->extension_enabled('S') || proc->extension_enabled('F')
-              || proc->extension_enabled('V');
+  const bool has_fs = (proc->extension_enabled('S') || proc->extension_enabled('F')
+              || proc->extension_enabled('V')) && !proc->extension_enabled(EXT_ZFINX);
   const bool has_vs = proc->extension_enabled('V');
   return 0
     | (proc->extension_enabled('S') ? (SSTATUS_SIE | SSTATUS_SPIE | SSTATUS_SPP) : 0)
@@ -1202,7 +1202,7 @@ float_csr_t::float_csr_t(processor_t* const proc, const reg_t addr, const reg_t
 void float_csr_t::verify_permissions(insn_t insn, bool write) const {
   masked_csr_t::verify_permissions(insn, write);
   require_fp;
-  if (!proc->extension_enabled('F'))
+  if (!proc->extension_enabled('F') && !proc->extension_enabled(EXT_ZFINX))
     throw trap_illegal_instruction(insn.bits());
 }
 

riscv/isa_parser.cc

@@ -130,6 +130,18 @@ isa_parser_t::isa_parser_t(const char* str, const char *priv)
       extension_table[EXT_ZBKC] = true;
     } else if (ext_str == "zbkx") {
       extension_table[EXT_ZBKX] = true;
+    } else if (ext_str == "zdinx") {
+      extension_table[EXT_ZFINX] = true;
+      extension_table[EXT_ZDINX] = true;
+    } else if (ext_str == "zfinx") {
+      extension_table[EXT_ZFINX] = true;
+    } else if (ext_str == "zhinx") {
+      extension_table[EXT_ZFINX] = true;
+      extension_table[EXT_ZHINX] = true;
+      extension_table[EXT_ZHINXMIN] = true;
+    } else if (ext_str == "zhinxmin") {
+      extension_table[EXT_ZFINX] = true;
+      extension_table[EXT_ZHINXMIN] = true;
     } else if (ext_str == "zk") {
       extension_table[EXT_ZBKB] = true;
       extension_table[EXT_ZBKC] = true;
@@ -229,6 +241,10 @@ isa_parser_t::isa_parser_t(const char* str, const char *priv)
     bad_isa_string(str, ("can't parse: " + std::string(p)).c_str());
   }
 
+  if (extension_table[EXT_ZFINX] && ((max_isa >> ('f' - 'a')) & 1)) {
+    bad_isa_string(str, ("Zfinx/ZDinx/Zhinx{min} extensions conflict with Base 'F/D/Q/Zfh{min}' extensions"));
+  }
+
   std::string lowercase = strtolower(priv);
   bool user = false, supervisor = false;