RISC-V: Improve the version parsing for arch string.

Keep the riscv_add_subset to do the same thing, and use a new
function, riscv_parse_add_subset, to cover most of the things
when parsing, including find the default versions for extensions,
and check whether the versions are valid.  The version 0p0 should
be an invalid version, that is the mistake I made before.  This
patch clarify the version rules as follows,

* We accept any version of extensions set by users, except 0p0.
* The non-standard x extensions must be set with versions in arch string.
* If user don't set the versions, or set 0p0 for the extensions, then try
  to find the supported versions according to the chosen ISA spec.
  Otherwise, report errors rather than output 0p0 for them.

Besides, we use as_bad rather than as_fatal to report more errors
for assembler.

	bfd/
	* elfxx-riscv.c (riscv_lookup_subset): Moved to front.
	(riscv_add_subset): Likewise.
	(riscv_release_subset_list): Likewise.
	(riscv_parse_add_subset): New function.  Find and check the
	versions before adding them by riscv_add_subset.
	(riscv_parsing_subset_version): Remove use_default_version
	and change the version type from unsigned to int.  Set the
	versions to RISCV_UNKNOWN_VERSION if we can not find them
	in the arch string.
	(riscv_parse_std_ext): Updated.
	(riscv_parse_prefixed_ext): Updated.  Since we use as_bad
	rather than as_fatal to report more errors, return NULL
	string if the parsed end_of_version is NULL, too.
	(riscv_parse_subset): Use a new boolean, no_conflict, to
	report more errors when we have more than one ISA conflicts.

	* elfxx-riscv.h (RISCV_DONT_CARE_VERSION): Changed to
	RISCV_UNKNOWN_VERSION.
	(riscv_lookup_subset_version): Removed.
	(riscv_parse_subset_t): Updated.

	gas/
	* config/tc-riscv.c (riscv_get_default_ext_version):
	Change the version type from unsigned to int.
	(riscv_set_arch): Use as_bad rather than as_fatal to
	report more errors.

	* testsuite/gas/riscv/attribute-02.d: Updated since x must be
	set with versions.
	* testsuite/gas/riscv/attribute-03.d: Likewise.
	* testsuite/gas/riscv/march-ok-two-nse.d: Likewise.
	* testsuite/gas/riscv/attribute-09.d: zicsr wasn't supported
	in the spec 2.2, so choose the newer spec.
	* testsuite/gas/riscv/march-fail-base-01.l: Updated since as_bad.
	* testsuite/gas/riscv/march-fail-base-02.l: Likewise.
	* testsuite/gas/riscv/march-fail-order-std.l: Likewise.
	* testsuite/gas/riscv/march-fail-order-x.l: Likewise.
	* testsuite/gas/riscv/march-fail-order-z.l: Likewise.
	* testsuite/gas/riscv/march-fail-porder.l: Likewise.
	* testsuite/gas/riscv/march-fail-rv32ef.l: Likewise.
	* testsuite/gas/riscv/march-fail-rv32id.l: Likewise.
	* testsuite/gas/riscv/march-fail-rv32iq.l: Likewise.
	* testsuite/gas/riscv/march-fail-rv64iq.l: Likewise.
	* testsuite/gas/riscv/march-fail-single-char.l: Likewise.
	* testsuite/gas/riscv/march-fail-unknown-std.l: Likewise.
	* testsuite/gas/riscv/march-fail-unknown.l: Likewise.
	* testsuite/gas/riscv/march-fail-uppercase.l: Likewise.
	* testsuite/gas/riscv/march-fail-version.l: Likewise.
	* testsuite/gas/riscv/march-fail-isa-spec.d: Likewise.
	* testsuite/gas/riscv/march-fail-isa-spec.l: Likewise.

	include/
	* opcode/riscv.h (riscv_ext_version):
	Change the version type from unsigned to int.

28 files changed, 250 insertions, 223 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 726a377..807e004 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,5 +1,27 @@
 2020-12-01  Nelson Chu  <nelson.chu@sifive.com>
 
+	* elfxx-riscv.c (riscv_lookup_subset): Moved to front.
+	(riscv_add_subset): Likewise.
+	(riscv_release_subset_list): Likewise.
+	(riscv_parse_add_subset): New function.  Find and check the
+	versions before adding them by riscv_add_subset.
+	(riscv_parsing_subset_version): Remove use_default_version
+	and change the version type from unsigned to int.  Set the
+	versions to RISCV_UNKNOWN_VERSION if we can not find them
+	in the arch string.
+	(riscv_parse_std_ext): Updated.
+	(riscv_parse_prefixed_ext): Updated.  Since we use as_bad
+	rather than as_fatal to report more errors, return NULL
+	string if the parsed end_of_version is NULL, too.
+	(riscv_parse_subset): Use a new boolean, no_conflict, to
+	report more errors when we have more than one ISA conflicts.
+	* elfxx-riscv.h (RISCV_DONT_CARE_VERSION): Changed to
+	RISCV_UNKNOWN_VERSION.
+	(riscv_lookup_subset_version): Removed.
+	(riscv_parse_subset_t): Updated.
+
+2020-12-01  Nelson Chu  <nelson.chu@sifive.com>
+
 	* elfxx-riscv.c (riscv_parse_std_ext): Stop parsing standard
 	extensions when parsed h keyword.
 	(riscv_get_prefix_class): Support prefixed h class.
diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
index 24eafcd..4ec429d 100644
--- a/bfd/elfxx-riscv.c
+++ b/bfd/elfxx-riscv.c
@@ -1025,6 +1025,96 @@ riscv_elf_add_sub_reloc (bfd *abfd,
   return bfd_reloc_ok;
 }
 
+/* Find subset in list, return NULL if not found.  */
+
+riscv_subset_t *
+riscv_lookup_subset (const riscv_subset_list_t *subset_list,
+		     const char *subset)
+{
+  riscv_subset_t *s;
+
+  for (s = subset_list->head; s != NULL; s = s->next)
+    if (strcasecmp (s->name, subset) == 0)
+      return s;
+
+  return NULL;
+}
+
+/* Add extension to the subset list.  */
+
+void
+riscv_add_subset (riscv_subset_list_t *subset_list,
+		  const char *subset,
+		  int major,
+		  int minor)
+{
+  riscv_subset_t *s = xmalloc (sizeof *s);
+
+  if (subset_list->head == NULL)
+    subset_list->head = s;
+
+  s->name = xstrdup (subset);
+  s->major_version = major;
+  s->minor_version = minor;
+  s->next = NULL;
+
+  if (subset_list->tail != NULL)
+    subset_list->tail->next = s;
+  subset_list->tail = s;
+}
+
+/* Find the default versions for the extension before adding them to
+   the subset list, if their versions are RISCV_UNKNOWN_VERSION.
+   Afterwards, report errors if we can not find their default versions.  */
+
+static void
+riscv_parse_add_subset (riscv_parse_subset_t *rps,
+			const char *subset,
+			int major,
+			int minor)
+{
+  int major_version = major;
+  int minor_version = minor;
+
+  if ((major_version == RISCV_UNKNOWN_VERSION
+       || minor_version == RISCV_UNKNOWN_VERSION)
+      && rps->get_default_version != NULL)
+    rps->get_default_version (subset, &major_version, &minor_version);
+
+  if (major_version == RISCV_UNKNOWN_VERSION
+      || minor_version == RISCV_UNKNOWN_VERSION)
+    {
+      if (subset[0] == 'x')
+	rps->error_handler
+	  (_("x ISA extension `%s' must be set with the versions"),
+	   subset);
+      else
+	rps->error_handler
+	  (_("cannot find default versions of the ISA extension `%s'"),
+	   subset);
+      return;
+    }
+
+  riscv_add_subset (rps->subset_list, subset,
+		    major_version, minor_version);
+}
+
+/* Release subset list.  */
+
+void
+riscv_release_subset_list (riscv_subset_list_t *subset_list)
+{
+   while (subset_list->head != NULL)
+    {
+      riscv_subset_t *next = subset_list->head->next;
+      free ((void *)subset_list->head->name);
+      free (subset_list->head);
+      subset_list->head = next;
+    }
+
+  subset_list->tail = NULL;
+}
+
 /* Parsing extension version.
 
    Return Value:
@@ -1034,25 +1124,20 @@ riscv_elf_add_sub_reloc (bfd *abfd,
      `rps`: Hooks and status for parsing extensions.
      `march`: Full arch string.
      `p`: Curent parsing position.
-     `major_version`: Parsing result of major version, using
-      default_major_version if version is not present in arch string.
-     `minor_version`: Parsing result of minor version, set to 0 if version is
-     not present in arch string, but set to `default_minor_version` if
-     `major_version` using default_major_version.
-     `std_ext_p`: True if parsing std extension.
-     `use_default_version`: Set it to True if we need the default version.  */
+     `major_version`: Parsed major version.
+     `minor_version`: Parsed minor version.
+     `std_ext_p`: True if parsing standard extension.  */
 
 static const char *
 riscv_parsing_subset_version (riscv_parse_subset_t *rps,
 			      const char *march,
 			      const char *p,
-			      unsigned *major_version,
-			      unsigned *minor_version,
-			      bfd_boolean std_ext_p,
-			      bfd_boolean *use_default_version)
+			      int *major_version,
+			      int *minor_version,
+			      bfd_boolean std_ext_p)
 {
   bfd_boolean major_p = TRUE;
-  unsigned version = 0;
+  int version = 0;
   char np;
 
   *major_version = 0;
@@ -1096,11 +1181,13 @@ riscv_parsing_subset_version (riscv_parse_subset_t *rps,
   else
     *minor_version = version;
 
-  /* We can not find any version in string, need to parse default version.  */
-  if (use_default_version != NULL
-      && *major_version == 0
-      && *minor_version == 0)
-    *use_default_version = TRUE;
+  /* We can not find any version in string.  */
+  if (*major_version == 0 && *minor_version == 0)
+    {
+      *major_version = RISCV_UNKNOWN_VERSION;
+      *minor_version = RISCV_UNKNOWN_VERSION;
+    }
+
   return p;
 }
 
@@ -1130,9 +1217,8 @@ riscv_parse_std_ext (riscv_parse_subset_t *rps,
 {
   const char *all_std_exts = riscv_supported_std_ext ();
   const char *std_exts = all_std_exts;
-  unsigned major_version = 0;
-  unsigned minor_version = 0;
-  bfd_boolean use_default_version = FALSE;
+  int major_version;
+  int minor_version;
   char subset[2] = {0, 0};
 
   /* First letter must start with i, e or g.  */
@@ -1141,42 +1227,23 @@ riscv_parse_std_ext (riscv_parse_subset_t *rps,
       case 'i':
 	p = riscv_parsing_subset_version (rps, march, ++p,
 					  &major_version,
-					  &minor_version, TRUE,
-					  &use_default_version);
-	/* Find the default version if needed.  */
-	if (use_default_version
-	    && rps->get_default_version != NULL)
-	  rps->get_default_version ("i",
-				    &major_version,
-				    &minor_version);
-	riscv_add_subset (rps->subset_list, "i",
-			  major_version,
-			  minor_version);
+					  &minor_version, TRUE);
+	riscv_parse_add_subset (rps, "i",
+				major_version,
+				minor_version);
 	break;
 
       case 'e':
 	p = riscv_parsing_subset_version (rps, march, ++p,
 					  &major_version,
-					  &minor_version, TRUE,
-					  &use_default_version);
-	/* Find the default version if needed.  */
-	if (use_default_version
-	    && rps->get_default_version != NULL)
-	  rps->get_default_version ("e",
-				    &major_version,
-				    &minor_version);
-	riscv_add_subset (rps->subset_list, "e",
-			  major_version,
-			  minor_version);
-
+					  &minor_version, TRUE);
+	riscv_parse_add_subset (rps, "e",
+				major_version,
+				minor_version);
 	/* i-ext must be enabled.  */
-	if (rps->get_default_version != NULL)
-	  rps->get_default_version ("i",
-				    &major_version,
-				    &minor_version);
-	riscv_add_subset (rps->subset_list, "i",
-			  major_version,
-			  minor_version);
+	riscv_parse_add_subset (rps, "i",
+				RISCV_UNKNOWN_VERSION,
+				RISCV_UNKNOWN_VERSION);
 
 	if (*rps->xlen > 32)
 	  {
@@ -1192,27 +1259,17 @@ riscv_parse_std_ext (riscv_parse_subset_t *rps,
 	   skip the setting if user set a version to it.  */
 	p = riscv_parsing_subset_version (rps, march, ++p,
 					  &major_version,
-					  &minor_version, TRUE,
-					  &use_default_version);
+					  &minor_version, TRUE);
 	/* i-ext must be enabled.  */
-	if (rps->get_default_version != NULL)
-	  rps->get_default_version ("i",
-				    &major_version,
-				    &minor_version);
-	riscv_add_subset (rps->subset_list, "i",
-			  major_version,
-			  minor_version);
-
+	riscv_parse_add_subset (rps, "i",
+				RISCV_UNKNOWN_VERSION,
+				RISCV_UNKNOWN_VERSION);
 	for ( ; *std_exts != 'q'; std_exts++)
 	  {
 	    subset[0] = *std_exts;
-	    if (rps->get_default_version != NULL)
-	      rps->get_default_version (subset,
-					&major_version,
-					&minor_version);
-	    riscv_add_subset (rps->subset_list, subset,
-			      major_version,
-			      minor_version);
+	    riscv_parse_add_subset (rps, subset,
+				    RISCV_UNKNOWN_VERSION,
+				    RISCV_UNKNOWN_VERSION);
 	  }
 	break;
 
@@ -1253,21 +1310,13 @@ riscv_parse_std_ext (riscv_parse_subset_t *rps,
 	}
 
       std_exts++;
-      use_default_version = FALSE;
       subset[0] = std_ext;
       p = riscv_parsing_subset_version (rps, march, ++p,
 					&major_version,
-					&minor_version, TRUE,
-					&use_default_version);
-      /* Find the default version if needed.  */
-      if (use_default_version
-	  && rps->get_default_version != NULL)
-	rps->get_default_version (subset,
-				  &major_version,
-				  &minor_version);
-      riscv_add_subset (rps->subset_list, subset,
-			major_version,
-			minor_version);
+					&minor_version, TRUE);
+      riscv_parse_add_subset (rps, subset,
+			      major_version,
+			      minor_version);
     }
 
   return p;
@@ -1324,11 +1373,10 @@ riscv_parse_prefixed_ext (riscv_parse_subset_t *rps,
 			  const char *p,
 			  const riscv_parse_config_t *config)
 {
-  unsigned major_version = 0;
-  unsigned minor_version = 0;
+  int major_version;
+  int minor_version;
   const char *last_name;
   riscv_isa_ext_class_t class;
-  bfd_boolean use_default_version;
 
   while (*p)
     {
@@ -1352,14 +1400,18 @@ riscv_parse_prefixed_ext (riscv_parse_subset_t *rps,
       while (*++q != '\0' && *q != '_' && !ISDIGIT (*q))
 	;
 
-      use_default_version = FALSE;
       end_of_version =
 	riscv_parsing_subset_version (rps, march, q,
 				      &major_version,
-				      &minor_version, FALSE,
-				      &use_default_version);
+				      &minor_version, FALSE);
       *q = '\0';
 
+      if (end_of_version == NULL)
+	{
+	  free (subset);
+	  return NULL;
+	}
+
       /* Check that the prefix extension is known.
 	 For 'x', anything goes but it cannot simply be 'x'.
 	 For 's', it must be known from a list and cannot simply be 's'.
@@ -1399,16 +1451,9 @@ riscv_parse_prefixed_ext (riscv_parse_subset_t *rps,
 	  return NULL;
 	}
 
-      /* Find the default version if needed.  */
-      if (use_default_version
-         && rps->get_default_version != NULL)
-       rps->get_default_version (subset,
-                                 &major_version,
-                                 &minor_version);
-      riscv_add_subset (rps->subset_list, subset,
-			major_version,
-			minor_version);
-
+      riscv_parse_add_subset (rps, subset,
+			      major_version,
+			      minor_version);
       free (subset);
       p += end_of_version - subset;
 
@@ -1529,6 +1574,7 @@ riscv_parse_subset (riscv_parse_subset_t *rps,
 {
   const char *p;
   size_t i;
+  bfd_boolean no_conflict = TRUE;
 
   for (p = arch; *p != '\0'; p++)
     {
@@ -1595,7 +1641,7 @@ riscv_parse_subset (riscv_parse_subset_t *rps,
       rps->error_handler
 	(_("-march=%s: rv32e does not support the `f' extension"),
 	 arch);
-      return FALSE;
+      no_conflict = FALSE;
     }
 
   if (riscv_lookup_subset (rps->subset_list, "q") && *rps->xlen < 64)
@@ -1603,7 +1649,7 @@ riscv_parse_subset (riscv_parse_subset_t *rps,
       rps->error_handler
 	(_("-march=%s: rv32 does not support the `q' extension"),
 	 arch);
-      return FALSE;
+      no_conflict = FALSE;
     }
 
   if (riscv_lookup_subset (rps->subset_list, "d")
@@ -1612,7 +1658,7 @@ riscv_parse_subset (riscv_parse_subset_t *rps,
       rps->error_handler
 	(_("-march=%s: `d' extension requires `f' extension"),
 	 arch);
-      return FALSE;
+      no_conflict = FALSE;
     }
 
   if (riscv_lookup_subset (rps->subset_list, "q")
@@ -1621,88 +1667,10 @@ riscv_parse_subset (riscv_parse_subset_t *rps,
       rps->error_handler
 	(_("-march=%s: `q' extension requires `d' extension"),
 	 arch);
-      return FALSE;
-    }
-
-  return TRUE;
-}
-
-/* Add new subset to list.  */
-
-void
-riscv_add_subset (riscv_subset_list_t *subset_list,
-		  const char *subset,
-		  int major,
-		  int minor)
-{
-  riscv_subset_t *s = xmalloc (sizeof *s);
-
-  if (subset_list->head == NULL)
-    subset_list->head = s;
-
-  s->name = xstrdup (subset);
-  s->major_version = major;
-  s->minor_version = minor;
-  s->next = NULL;
-
-  if (subset_list->tail != NULL)
-    subset_list->tail->next = s;
-
-  subset_list->tail = s;
-}
-
-/* Find subset in list without version checking, return NULL if not found.  */
-
-riscv_subset_t *
-riscv_lookup_subset (const riscv_subset_list_t *subset_list,
-		     const char *subset)
-{
-  return riscv_lookup_subset_version
-    (subset_list, subset,
-     RISCV_DONT_CARE_VERSION,
-     RISCV_DONT_CARE_VERSION);
-}
-
-/* Find subset in list with version checking, return NULL if not found.  */
-
-riscv_subset_t *
-riscv_lookup_subset_version (const riscv_subset_list_t *subset_list,
-			     const char *subset,
-			     int major, int minor)
-{
-  riscv_subset_t *s;
-
-  for (s = subset_list->head; s != NULL; s = s->next)
-    if (strcasecmp (s->name, subset) == 0)
-      {
-	if ((major != RISCV_DONT_CARE_VERSION)
-	    && (s->major_version != major))
-	  return NULL;
-
-	if ((minor != RISCV_DONT_CARE_VERSION)
-	    && (s->minor_version != minor))
-	  return NULL;
-
-	return s;
-      }
-
-  return NULL;
-}
-
-/* Release subset list.  */
-
-void
-riscv_release_subset_list (riscv_subset_list_t *subset_list)
-{
-   while (subset_list->head != NULL)
-    {
-      riscv_subset_t *next = subset_list->head->next;
-      free ((void *)subset_list->head->name);
-      free (subset_list->head);
-      subset_list->head = next;
+      no_conflict = FALSE;
     }
 
-  subset_list->tail = NULL;
+  return no_conflict;
 }
 
 /* Return the number of digits for the input.  */
diff --git a/bfd/elfxx-riscv.h b/bfd/elfxx-riscv.h
index 6b7cc5b..45705ce 100644
--- a/bfd/elfxx-riscv.h
+++ b/bfd/elfxx-riscv.h
@@ -33,7 +33,7 @@ riscv_reloc_type_lookup (bfd *, bfd_reloc_code_real_type);
 extern reloc_howto_type *
 riscv_elf_rtype_to_howto (bfd *, unsigned int r_type);
 
-#define RISCV_DONT_CARE_VERSION -1
+#define RISCV_UNKNOWN_VERSION -1
 
 /* The information of architecture attribute.  */
 struct riscv_subset_t
@@ -64,11 +64,6 @@ extern riscv_subset_t *
 riscv_lookup_subset (const riscv_subset_list_t *,
 		     const char *);
 
-extern riscv_subset_t *
-riscv_lookup_subset_version (const riscv_subset_list_t *,
-			     const char *,
-			     int, int);
-
 typedef struct
 {
   riscv_subset_list_t *subset_list;
@@ -76,8 +71,8 @@ typedef struct
 			 ...) ATTRIBUTE_PRINTF_1;
   unsigned *xlen;
   void (*get_default_version) (const char *,
-			       unsigned int *,
-			       unsigned int *);
+			       int *,
+			       int *);
 } riscv_parse_subset_t;
 
 extern bfd_boolean
diff --git a/gas/ChangeLog b/gas/ChangeLog
index 64d2fa7..2b45509 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,35 @@
 2020-12-01  Nelson Chu  <nelson.chu@sifive.com>
 
+	* config/tc-riscv.c (riscv_get_default_ext_version):
+	Change the version type from unsigned to int.
+	(riscv_set_arch): Use as_bad rather than as_fatal to
+	report more errors.
+	* testsuite/gas/riscv/attribute-02.d: Updated since x must be
+	set with versions.
+	* testsuite/gas/riscv/attribute-03.d: Likewise.
+	* testsuite/gas/riscv/march-ok-two-nse.d: Likewise.
+	* testsuite/gas/riscv/attribute-09.d: zicsr wasn't supported
+	in the spec 2.2, so choose the newer spec.
+	* testsuite/gas/riscv/march-fail-base-01.l: Updated since as_bad.
+	* testsuite/gas/riscv/march-fail-base-02.l: Likewise.
+	* testsuite/gas/riscv/march-fail-order-std.l: Likewise.
+	* testsuite/gas/riscv/march-fail-order-x.l: Likewise.
+	* testsuite/gas/riscv/march-fail-order-z.l: Likewise.
+	* testsuite/gas/riscv/march-fail-porder.l: Likewise.
+	* testsuite/gas/riscv/march-fail-rv32ef.l: Likewise.
+	* testsuite/gas/riscv/march-fail-rv32id.l: Likewise.
+	* testsuite/gas/riscv/march-fail-rv32iq.l: Likewise.
+	* testsuite/gas/riscv/march-fail-rv64iq.l: Likewise.
+	* testsuite/gas/riscv/march-fail-single-char.l: Likewise.
+	* testsuite/gas/riscv/march-fail-unknown-std.l: Likewise.
+	* testsuite/gas/riscv/march-fail-unknown.l: Likewise.
+	* testsuite/gas/riscv/march-fail-uppercase.l: Likewise.
+	* testsuite/gas/riscv/march-fail-version.l: Likewise.
+	* testsuite/gas/riscv/march-fail-isa-spec.d: Likewise.
+	* testsuite/gas/riscv/march-fail-isa-spec.l: Likewise.
+
+2020-12-01  Nelson Chu  <nelson.chu@sifive.com>
+
 	* testsuite/gas/riscv/march-fail-order-z.d: New testcase, check
 	orders of prefixed z extensions.
 	* testsuite/gas/riscv/march-fail-order-z.l: Likewise.
diff --git a/gas/config/tc-riscv.c b/gas/config/tc-riscv.c
index 2340ff5..236a858 100644
--- a/gas/config/tc-riscv.c
+++ b/gas/config/tc-riscv.c
@@ -275,28 +275,25 @@ init_ext_version_hash (const struct riscv_ext_version *table)
 
 static void
 riscv_get_default_ext_version (const char *name,
-                              unsigned int *major_version,
-                              unsigned int *minor_version)
+			       int *major_version,
+			       int *minor_version)
 {
   struct riscv_ext_version *ext;
 
-  *major_version = 0;
-  *minor_version = 0;
-
   if (name == NULL || default_isa_spec == ISA_SPEC_CLASS_NONE)
     return;
 
   ext = (struct riscv_ext_version *) str_hash_find (ext_version_hash, name);
   while (ext
-        && ext->name
-        && strcmp (ext->name, name) == 0)
+	 && ext->name
+	 && strcmp (ext->name, name) == 0)
     {
       if (ext->isa_spec_class == default_isa_spec)
-       {
-         *major_version = ext->major_version;
-         *minor_version = ext->minor_version;
-         return;
-       }
+	{
+	  *major_version = ext->major_version;
+	  *minor_version = ext->minor_version;
+	  return;
+	}
       ext++;
     }
 }
@@ -308,7 +305,7 @@ riscv_set_arch (const char *s)
 {
   riscv_parse_subset_t rps;
   rps.subset_list = &riscv_subsets;
-  rps.error_handler = as_fatal;
+  rps.error_handler = as_bad;
   rps.xlen = &xlen;
   rps.get_default_version = riscv_get_default_ext_version;
 
diff --git a/gas/testsuite/gas/riscv/attribute-02.d b/gas/testsuite/gas/riscv/attribute-02.d
index ae0195e..45b89f2 100644
--- a/gas/testsuite/gas/riscv/attribute-02.d
+++ b/gas/testsuite/gas/riscv/attribute-02.d
@@ -1,6 +1,6 @@
-#as: -march=rv32gxargle -march-attr -misa-spec=2.2
+#as: -march=rv32gxargle2p0 -march-attr -misa-spec=2.2
 #readelf: -A
 #source: empty.s
 Attribute Section: riscv
 File Attributes
-  Tag_RISCV_arch: "rv32i2p0_m2p0_a2p0_f2p0_d2p0_xargle0p0"
+  Tag_RISCV_arch: "rv32i2p0_m2p0_a2p0_f2p0_d2p0_xargle2p0"
diff --git a/gas/testsuite/gas/riscv/attribute-03.d b/gas/testsuite/gas/riscv/attribute-03.d
index 9916ff6..11416d6 100644
--- a/gas/testsuite/gas/riscv/attribute-03.d
+++ b/gas/testsuite/gas/riscv/attribute-03.d
@@ -1,6 +1,6 @@
-#as: -march=rv32gxargle_xfoo -march-attr -misa-spec=2.2
+#as: -march=rv32gxargle2p0_xfoo3p0 -march-attr -misa-spec=2.2
 #readelf: -A
 #source: empty.s
 Attribute Section: riscv
 File Attributes
-  Tag_RISCV_arch: "rv32i2p0_m2p0_a2p0_f2p0_d2p0_xargle0p0_xfoo0p0"
+  Tag_RISCV_arch: "rv32i2p0_m2p0_a2p0_f2p0_d2p0_xargle2p0_xfoo3p0"
diff --git a/gas/testsuite/gas/riscv/attribute-09.d b/gas/testsuite/gas/riscv/attribute-09.d
index cad1713..fc87f82 100644
--- a/gas/testsuite/gas/riscv/attribute-09.d
+++ b/gas/testsuite/gas/riscv/attribute-09.d
@@ -1,6 +1,6 @@
-#as: -march-attr -march=rv32i2p1m_zicsr -misa-spec=2.2
+#as: -march-attr -march=rv32i2p2m_zicsr -misa-spec=20191213
 #readelf: -A
 #source: empty.s
 Attribute Section: riscv
 File Attributes
-  Tag_RISCV_arch: "rv32i2p1_m2p0_zicsr0p0"
+  Tag_RISCV_arch: "rv32i2p2_m2p0_zicsr2p0"
diff --git a/gas/testsuite/gas/riscv/march-fail-base-01.l b/gas/testsuite/gas/riscv/march-fail-base-01.l
index 9fa071f..45d5c9a 100644
--- a/gas/testsuite/gas/riscv/march-fail-base-01.l
+++ b/gas/testsuite/gas/riscv/march-fail-base-01.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*first ISA extension must be `e', `i' or `g'
+.*Error: .*first ISA extension must be `e', `i' or `g'
diff --git a/gas/testsuite/gas/riscv/march-fail-base-02.l b/gas/testsuite/gas/riscv/march-fail-base-02.l
index 6fc4dfa..f6a3c1d 100644
--- a/gas/testsuite/gas/riscv/march-fail-base-02.l
+++ b/gas/testsuite/gas/riscv/march-fail-base-02.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*rv64e is not a valid base ISA
+.*Error: .*rv64e is not a valid base ISA
diff --git a/gas/testsuite/gas/riscv/march-fail-isa-spec.d b/gas/testsuite/gas/riscv/march-fail-isa-spec.d
new file mode 100644
index 0000000..af707e2
--- /dev/null
+++ b/gas/testsuite/gas/riscv/march-fail-isa-spec.d
@@ -0,0 +1,3 @@
+#as: -march=rv32iln_zicsr_xargle_xbargle -misa-spec=20191213
+#source: empty.s
+#error_output: march-fail-isa-spec.l
diff --git a/gas/testsuite/gas/riscv/march-fail-isa-spec.l b/gas/testsuite/gas/riscv/march-fail-isa-spec.l
new file mode 100644
index 0000000..e714ddf
--- /dev/null
+++ b/gas/testsuite/gas/riscv/march-fail-isa-spec.l
@@ -0,0 +1,5 @@
+.*Assembler messages:
+.*Error: cannot find default versions of the ISA extension `l'
+.*Error: cannot find default versions of the ISA extension `n'
+.*Error: x ISA extension `xargle' must be set with the versions
+.*Error: x ISA extension `xbargle' must be set with the versions
diff --git a/gas/testsuite/gas/riscv/march-fail-order-std.l b/gas/testsuite/gas/riscv/march-fail-order-std.l
index 666a8c0..9e3ce5e 100644
--- a/gas/testsuite/gas/riscv/march-fail-order-std.l
+++ b/gas/testsuite/gas/riscv/march-fail-order-std.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*standard ISA extension `m' is not in canonical order
+.*Error: .*standard ISA extension `m' is not in canonical order
diff --git a/gas/testsuite/gas/riscv/march-fail-order-x.l b/gas/testsuite/gas/riscv/march-fail-order-x.l
index f7b383d..025db14 100644
--- a/gas/testsuite/gas/riscv/march-fail-order-x.l
+++ b/gas/testsuite/gas/riscv/march-fail-order-x.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*x ISA extension `xargle' is not in alphabetical order.  It must come before `xbargle'
+.*Error: .*x ISA extension `xargle' is not in alphabetical order.  It must come before `xbargle'
diff --git a/gas/testsuite/gas/riscv/march-fail-order-z.l b/gas/testsuite/gas/riscv/march-fail-order-z.l
index 1129219..a98c53a 100644
--- a/gas/testsuite/gas/riscv/march-fail-order-z.l
+++ b/gas/testsuite/gas/riscv/march-fail-order-z.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*z ISA extension `zicsr' is not in alphabetical order.  It must come before `zifencei'
+.*Error: .*z ISA extension `zicsr' is not in alphabetical order.  It must come before `zifencei'
diff --git a/gas/testsuite/gas/riscv/march-fail-porder.l b/gas/testsuite/gas/riscv/march-fail-porder.l
index a06d586..c5496ea 100644
--- a/gas/testsuite/gas/riscv/march-fail-porder.l
+++ b/gas/testsuite/gas/riscv/march-fail-porder.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*unexpected ISA string at end:.*
+.*Error: .*unexpected ISA string at end:.*
diff --git a/gas/testsuite/gas/riscv/march-fail-rv32ef.l b/gas/testsuite/gas/riscv/march-fail-rv32ef.l
index d2d915d..e6d93f2 100644
--- a/gas/testsuite/gas/riscv/march-fail-rv32ef.l
+++ b/gas/testsuite/gas/riscv/march-fail-rv32ef.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*rv32e does not support the `f' extension
+.*Error: .*rv32e does not support the `f' extension
diff --git a/gas/testsuite/gas/riscv/march-fail-rv32id.l b/gas/testsuite/gas/riscv/march-fail-rv32id.l
index 29b2717..c5f990c 100644
--- a/gas/testsuite/gas/riscv/march-fail-rv32id.l
+++ b/gas/testsuite/gas/riscv/march-fail-rv32id.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*`d' extension requires `f' extension
+.*Error: .*`d' extension requires `f' extension
diff --git a/gas/testsuite/gas/riscv/march-fail-rv32iq.l b/gas/testsuite/gas/riscv/march-fail-rv32iq.l
index 361c381..8143dd4 100644
--- a/gas/testsuite/gas/riscv/march-fail-rv32iq.l
+++ b/gas/testsuite/gas/riscv/march-fail-rv32iq.l
@@ -1,2 +1,3 @@
 .*Assembler messages:
-.*Fatal error: .*rv32 does not support the `q' extension
+.*Error: .*rv32 does not support the `q' extension
+.*Error: .*`q' extension requires `d' extension
diff --git a/gas/testsuite/gas/riscv/march-fail-rv64iq.l b/gas/testsuite/gas/riscv/march-fail-rv64iq.l
index 76a4104..787f46d 100644
--- a/gas/testsuite/gas/riscv/march-fail-rv64iq.l
+++ b/gas/testsuite/gas/riscv/march-fail-rv64iq.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*`q' extension requires `d' extension
+.*Error: .*`q' extension requires `d' extension
diff --git a/gas/testsuite/gas/riscv/march-fail-single-char.l b/gas/testsuite/gas/riscv/march-fail-single-char.l
index 6466e16..435d0b2 100644
--- a/gas/testsuite/gas/riscv/march-fail-single-char.l
+++ b/gas/testsuite/gas/riscv/march-fail-single-char.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*unknown (s|h|z|x) ISA extension `(s|h|z|x)'
+.*Error: .*unknown (s|h|z|x) ISA extension `(s|h|z|x)'
diff --git a/gas/testsuite/gas/riscv/march-fail-unknown-std.l b/gas/testsuite/gas/riscv/march-fail-unknown-std.l
index cb85637..75cdda3 100644
--- a/gas/testsuite/gas/riscv/march-fail-unknown-std.l
+++ b/gas/testsuite/gas/riscv/march-fail-unknown-std.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*unknown standard ISA extension `[^eimafdqiglcbjtpvn]'
+.*Error: .*unknown standard ISA extension `[^eimafdqiglcbjtpvn]'
diff --git a/gas/testsuite/gas/riscv/march-fail-unknown.l b/gas/testsuite/gas/riscv/march-fail-unknown.l
index 28a864d..874b8d4 100644
--- a/gas/testsuite/gas/riscv/march-fail-unknown.l
+++ b/gas/testsuite/gas/riscv/march-fail-unknown.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*unknown (s|h|z) ISA extension `(s|h|z)foo'
+.*Error: .*unknown (s|h|z) ISA extension `(s|h|z)foo'
diff --git a/gas/testsuite/gas/riscv/march-fail-uppercase.l b/gas/testsuite/gas/riscv/march-fail-uppercase.l
index 292c18a..14f03d6 100644
--- a/gas/testsuite/gas/riscv/march-fail-uppercase.l
+++ b/gas/testsuite/gas/riscv/march-fail-uppercase.l
@@ -1,2 +1,2 @@
 .*Assembler messages:
-.*Fatal error: .*ISA string cannot contain uppercase letters
+.*Error: .*ISA string cannot contain uppercase letters
diff --git a/gas/testsuite/gas/riscv/march-fail-version.l b/gas/testsuite/gas/riscv/march-fail-version.l
index b5d0b91..c7f8a4d 100644
--- a/gas/testsuite/gas/riscv/march-fail-version.l
+++ b/gas/testsuite/gas/riscv/march-fail-version.l
@@ -1,2 +1,3 @@
 .*Assembler messages:
-.*Fatal error: .*expect number after `2p'
+.*Error: cannot find default versions of the ISA extension `p'
+.*Error: .*expect number after `2p'
diff --git a/gas/testsuite/gas/riscv/march-ok-two-nse.d b/gas/testsuite/gas/riscv/march-ok-two-nse.d
index 0fe5037..e78cf9d 100644
--- a/gas/testsuite/gas/riscv/march-ok-two-nse.d
+++ b/gas/testsuite/gas/riscv/march-ok-two-nse.d
@@ -1,4 +1,4 @@
-#as: -march=rv32imafd_xargle_xbargle
+#as: -march=rv32imafd_xargle2p0_xbargle3p0
 #objdump: -dr
 #source: empty.s
 
diff --git a/include/ChangeLog b/include/ChangeLog
index 2816129..7cda518 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2020-12-01  Nelson Chu  <nelson.chu@sifive.com>
+
+	* opcode/riscv.h (riscv_ext_version):
+	Change the version type from unsigned to int.
+
 2020-11-23  Nick Alcock  <nick.alcock@oracle.com>
 
 	* ctf-api.h: Style nit: remove () on function names in comments.
diff --git a/include/opcode/riscv.h b/include/opcode/riscv.h
index 2f1bc79..94a1380 100644
--- a/include/opcode/riscv.h
+++ b/include/opcode/riscv.h
@@ -360,8 +360,8 @@ struct riscv_ext_version
 {
   const char *name;
   enum riscv_isa_spec_class isa_spec_class;
-  unsigned int major_version;
-  unsigned int minor_version;
+  int major_version;
+  int minor_version;
 };
 
 /* All RISC-V CSR belong to one of these classes.  */