diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
index a09403fbd11..416ec99c8e4 100644
--- a/gas/config/tc-riscv.c
+++ b/gas/config/tc-riscv.c
@@ -234,6 +234,7 @@ struct riscv_set_options
   bool relax; /* Emit relocs the linker is allowed to relax.  */
   bool arch_attr; /* Emit architecture and privileged elf attributes.  */
   bool csr_check; /* Enable the CSR checking.  */
+  bool arch_is_default; /* Architecture string is not modified.  */
 };
 
 static struct riscv_set_options riscv_opts =
@@ -243,6 +244,7 @@ static struct riscv_set_options riscv_opts =
   true,  /* relax */
   (bool) DEFAULT_RISCV_ATTR, /* arch_attr */
   false, /* csr_check */
+  true,  /* arch_is_default */
 };
 
 /* Enable or disable the rvc flags for riscv_opts.  Turn on the rvc flag
@@ -282,6 +284,9 @@ struct riscv_option_stack
 
 static struct riscv_option_stack *riscv_opts_stack = NULL;
 
+/* Output the instruction mapping symbols with ISA string if it is true.  */
+static bool updated_riscv_subsets = false;
+
 /* Set which ISA and extensions are available.  */
 
 static void
@@ -453,6 +458,7 @@ make_mapping_symbol (enum riscv_seg_mstate state,
 		     fragS *frag)
 {
   const char *name;
+  char *buff = NULL;
   switch (state)
     {
     case MAP_DATA:
@@ -460,6 +466,15 @@ make_mapping_symbol (enum riscv_seg_mstate state,
       break;
     case MAP_INSN:
       name = "$x";
+      if (!riscv_opts.arch_is_default)
+	{
+	  char *isa = riscv_arch_str (xlen, riscv_subsets);
+	  size_t size = strlen (isa) + 3; /* "$x" + '\0'  */
+	  name = buff = xmalloc (size);
+	  snprintf (buff, size, "$x%s", isa);
+	  xfree ((void *) isa);
+	}
+      updated_riscv_subsets = false;
       break;
     default:
       abort ();
@@ -467,6 +482,7 @@ make_mapping_symbol (enum riscv_seg_mstate state,
 
   symbolS *symbol = symbol_new (name, now_seg, frag, value);
   symbol_get_bfdsym (symbol)->flags |= (BSF_NO_FLAGS | BSF_LOCAL);
+  xfree ((void *) buff);
 
   /* If .fill or other data filling directive generates zero sized data,
      or we are adding odd alignemnts, then the mapping symbol for the
@@ -488,7 +504,14 @@ make_mapping_symbol (enum riscv_seg_mstate state,
       /* The mapping symbols should be added in offset order.  */
       know (S_GET_VALUE (frag->tc_frag_data.last_map_symbol)
 			 <= S_GET_VALUE (symbol));
-      /* Remove the old one.  */
+      /* Remove the new one if the name matches.  */
+      if (strcmp (S_GET_NAME (frag->tc_frag_data.last_map_symbol),
+		  S_GET_NAME (symbol)) == 0)
+	{
+	  symbol_remove (symbol, &symbol_rootP, &symbol_lastP);
+	  return;
+	}
+      /* Remove the old one if the value matches.  */
       if (S_GET_VALUE (frag->tc_frag_data.last_map_symbol)
 	  == S_GET_VALUE (symbol))
 	symbol_remove (frag->tc_frag_data.last_map_symbol,
@@ -497,6 +520,14 @@ make_mapping_symbol (enum riscv_seg_mstate state,
   frag->tc_frag_data.last_map_symbol = symbol;
 }
 
+/* Called when the section is change.  Try to emit a new mapping symbol.  */
+
+void
+riscv_elf_section_change_hook (void)
+{
+  updated_riscv_subsets = true;
+}
+
 /* Set the mapping state for frag_now.  */
 
 void
@@ -516,7 +547,8 @@ riscv_mapping_state (enum riscv_seg_mstate to_state,
 
   /* The mapping symbol should be emitted if not in the right
      mapping state.  */
-  if (from_state == to_state)
+  if (from_state == to_state
+      && (to_state != MAP_INSN || !updated_riscv_subsets))
     return;
 
   valueT value = (valueT) (frag_now_fix () - max_chars);
@@ -3855,11 +3887,15 @@ s_riscv_option (int x ATTRIBUTE_UNUSED)
   if (strcmp (name, "rvc") == 0)
     {
       riscv_update_subset (&riscv_rps_as, "+c");
+      updated_riscv_subsets = true;
+      riscv_opts.arch_is_default = false;
       riscv_set_rvc (true);
     }
   else if (strcmp (name, "norvc") == 0)
     {
       riscv_update_subset (&riscv_rps_as, "-c");
+      updated_riscv_subsets = true;
+      riscv_opts.arch_is_default = false;
       riscv_set_rvc (false);
     }
   else if (strcmp (name, "pic") == 0)
@@ -3880,6 +3916,8 @@ s_riscv_option (int x ATTRIBUTE_UNUSED)
       if (ISSPACE (*name) && *name != '\0')
 	name++;
       riscv_update_subset (&riscv_rps_as, name);
+      updated_riscv_subsets = true;
+      riscv_opts.arch_is_default = false;
 
       riscv_set_rvc (false);
       if (riscv_subset_supports (&riscv_rps_as, "c"))
@@ -3911,6 +3949,7 @@ s_riscv_option (int x ATTRIBUTE_UNUSED)
 	  riscv_opts = s->options;
 	  riscv_subsets = s->subset_list;
 	  riscv_rps_as.subset_list = riscv_subsets;
+	  updated_riscv_subsets = true;
 	  riscv_release_subset_list (release_subsets);
 	  free (s);
 	}
diff --git a/gas/config/tc-riscv.h b/gas/config/tc-riscv.h
index 802e7afe670..f46308bddb2 100644
--- a/gas/config/tc-riscv.h
+++ b/gas/config/tc-riscv.h
@@ -140,6 +140,11 @@ struct riscv_segment_info_type
   enum riscv_seg_mstate map_state;
 };
 
+#ifdef OBJ_ELF
+#define md_elf_section_change_hook() riscv_elf_section_change_hook ()
+extern void riscv_elf_section_change_hook (void);
+#endif
+
 /* Define target fragment type.  */
 #define TC_FRAG_TYPE struct riscv_frag_type
 struct riscv_frag_type
diff --git a/gas/testsuite/gas/riscv/mapping-01a.d b/gas/testsuite/gas/riscv/mapping-01a.d
index 32e0027a13d..386127c7855 100644
--- a/gas/testsuite/gas/riscv/mapping-01a.d
+++ b/gas/testsuite/gas/riscv/mapping-01a.d
@@ -8,10 +8,10 @@ SYMBOL TABLE:
 0+00 l    d  .text	0+00 .text
 0+00 l    d  .data	0+00 .data
 0+00 l    d  .bss	0+00 .bss
-0+00 l       .text	0+00 \$x
+0+00 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+00 l    d  .foo	0+00 .foo
 0+00 l       .foo	0+00 foo
-0+00 l       .foo	0+00 \$x
+0+00 l       .foo	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+00 l    d  .riscv.attributes	0+00 .riscv.attributes
 0+00 g       .text	0+00 funcA
 0+08 g       .text	0+00 funcB
diff --git a/gas/testsuite/gas/riscv/mapping-02a.d b/gas/testsuite/gas/riscv/mapping-02a.d
index 333f12cd343..d59f7805645 100644
--- a/gas/testsuite/gas/riscv/mapping-02a.d
+++ b/gas/testsuite/gas/riscv/mapping-02a.d
@@ -9,7 +9,7 @@ SYMBOL TABLE:
 0+00 l    d  .data	0+00 .data
 0+00 l    d  .bss	0+00 .bss
 0+00 l       .text	0+00 \$d
-0+04 l       .text	0+00 \$x
+0+04 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+0c l       .text	0+00 \$d
-0+0e l       .text	0+00 \$x
+0+0e l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+00 l    d  .riscv.attributes	0+00 .riscv.attributes
diff --git a/gas/testsuite/gas/riscv/mapping-03a.d b/gas/testsuite/gas/riscv/mapping-03a.d
index d3663b663aa..d2cd9376800 100644
--- a/gas/testsuite/gas/riscv/mapping-03a.d
+++ b/gas/testsuite/gas/riscv/mapping-03a.d
@@ -8,13 +8,13 @@ SYMBOL TABLE:
 0+00 l    d  .text	0+00 .text
 0+00 l    d  .data	0+00 .data
 0+00 l    d  .bss	0+00 .bss
-0+00 l       .text	0+00 \$x
+0+00 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+04 l       .text	0+00 \$d
-0+08 l       .text	0+00 \$x
+0+08 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+14 l       .text	0+00 \$d
-0+18 l       .text	0+00 \$x
+0+18 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+1c l       .text	0+00 \$d
-0+21 l       .text	0+00 \$x
+0+21 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+2d l       .text	0+00 \$d
-0+31 l       .text	0+00 \$x
+0+31 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+00 l    d  .riscv.attributes	0+00 .riscv.attributes
diff --git a/gas/testsuite/gas/riscv/mapping-04a.d b/gas/testsuite/gas/riscv/mapping-04a.d
index 1ae9653212b..817bace9690 100644
--- a/gas/testsuite/gas/riscv/mapping-04a.d
+++ b/gas/testsuite/gas/riscv/mapping-04a.d
@@ -9,7 +9,7 @@ SYMBOL TABLE:
 0+00 l    d  .data	0+00 .data
 0+00 l    d  .bss	0+00 .bss
 0+00 l       .text	0+00 \$d
-0+0d l       .text	0+00 \$x
+0+0d l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+15 l       .text	0+00 \$d
-0+1f l       .text	0+00 \$x
+0+1f l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+00 l    d  .riscv.attributes	0+00 .riscv.attributes
diff --git a/gas/testsuite/gas/riscv/mapping-norelax-03a.d b/gas/testsuite/gas/riscv/mapping-norelax-03a.d
index 916f732b7f7..2dc2f399c7b 100644
--- a/gas/testsuite/gas/riscv/mapping-norelax-03a.d
+++ b/gas/testsuite/gas/riscv/mapping-norelax-03a.d
@@ -8,14 +8,14 @@ SYMBOL TABLE:
 0+00 l    d  .text	0+00 .text
 0+00 l    d  .data	0+00 .data
 0+00 l    d  .bss	0+00 .bss
-0+00 l       .text	0+00 \$x
+0+00 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+04 l       .text	0+00 \$d
-0+08 l       .text	0+00 \$x
+0+08 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+10 l       .text	0+00 \$d
-0+14 l       .text	0+00 \$x
+0+14 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+18 l       .text	0+00 \$d
 0+20 l       .text	0+00 \$d
-0+24 l       .text	0+00 \$x
+0+24 l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+1d l       .text	0+00 \$d
-0+1e l       .text	0+00 \$x
+0+1e l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+00 l    d  .riscv.attributes	0+00 .riscv.attributes
diff --git a/gas/testsuite/gas/riscv/mapping-norelax-04a.d b/gas/testsuite/gas/riscv/mapping-norelax-04a.d
index d552a7f632a..9050df5a11a 100644
--- a/gas/testsuite/gas/riscv/mapping-norelax-04a.d
+++ b/gas/testsuite/gas/riscv/mapping-norelax-04a.d
@@ -10,7 +10,7 @@ SYMBOL TABLE:
 0+00 l    d  .bss	0+00 .bss
 0+00 l       .text	0+00 \$d
 0+14 l       .text	0+00 \$d
-0+1e l       .text	0+00 \$x
+0+1e l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+0d l       .text	0+00 \$d
-0+0e l       .text	0+00 \$x
+0+0e l       .text	0+00 \$xrv64i2p1_m2p0_a2p1_f2p2_d2p2_zicsr2p0_zifencei2p0
 0+00 l    d  .riscv.attributes	0+00 .riscv.attributes
diff --git a/opcodes/riscv-dis.c b/opcodes/riscv-dis.c
index 164fd209dbd..4b7b17235ee 100644
--- a/opcodes/riscv-dis.c
+++ b/opcodes/riscv-dis.c
@@ -750,7 +750,7 @@ riscv_get_map_state (int n,
     return false;
 
   name = bfd_asymbol_name(info->symtab[n]);
-  if (strcmp (name, "$x") == 0)
+  if (strncmp (name, "$x", 2) == 0)
     *state = MAP_INSN;
   else if (strcmp (name, "$d") == 0)
     *state = MAP_DATA;