[PATCH v2] RISC-V: Add support for numbered ISA mapping strings

[Joseph Faulls]

The elf psabi allows for mapping symbols to be of the form $x<ISA>.<any>

    opcodes/
            * riscv-dis.c (riscv_get_map_state): allow mapping symbol to
              be suffixed by a unique identifier .<any>

Changes from v1:

  *   Use xmalloc (thanks Jan)
---
opcodes/riscv-dis.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/opcodes/riscv-dis.c b/opcodes/riscv-dis.c
index c0fd0625a2d..18a5c26f9a6 100644
--- a/opcodes/riscv-dis.c
+++ b/opcodes/riscv-dis.c
@@ -869,7 +869,23 @@ riscv_get_map_state (int n,
     {
       *state = MAP_INSN;
       riscv_release_subset_list (&riscv_subsets);
-      riscv_parse_subset (&riscv_rps_dis, name + 2);
+
+      /* ISA mapping string may be numbered, suffixed with '.n'. Do not
+        consider this as part of the ISA string.  */
+      char *suffix = strchr (name, '.');
+      if (suffix)
+       {
+         int suffix_index = (int)(suffix - name);
+         char *name_substr = xmalloc (suffix_index + 1);
+         strncpy (name_substr, name, suffix_index);
+         name_substr[suffix_index] = '\0';
+         riscv_parse_subset (&riscv_rps_dis, name_substr + 2);
+         free (name_substr);
+       }
+      else
+       {
+         riscv_parse_subset (&riscv_rps_dis, name + 2);
+       }
     }
   else
     return false;
--
2.34.1