opcode/

[pf3gnuchains/pf3gnuchains4x.git] / opcodes / s390-dis.c

diff --git a/opcodes/s390-dis.c b/opcodes/s390-dis.c
index b9eeb79..37ed2e7 100644 (file)
--- a/opcodes/s390-dis.c
+++ b/opcodes/s390-dis.c
@@ -166,6 +166,8 @@ print_insn_s390 (bfd_vma memaddr, struct disassemble_info *info)
 
   if (status == 0)
     {
+      const struct s390_opcode *op;
+
       /* Find the first match in the opcode table.  */
       opcode_end = s390_opcodes + s390_num_opcodes;
       for (opcode = s390_opcodes + opc_index[(int) buffer[0]];
@@ -178,6 +180,7 @@ print_insn_s390 (bfd_vma memaddr, struct disassemble_info *info)
          /* Check architecture.  */
          if (!(opcode->modes & current_arch_mask))
            continue;
+
          /* Check signature of the opcode.  */
          if ((buffer[1] & opcode->mask[1]) != opcode->opcode[1]
              || (buffer[2] & opcode->mask[2]) != opcode->opcode[2]
@@ -186,6 +189,28 @@ print_insn_s390 (bfd_vma memaddr, struct disassemble_info *info)
              || (buffer[5] & opcode->mask[5]) != opcode->opcode[5])
            continue;
 
+         /* Advance to an opcode with a more specific mask.  */
+         for (op = opcode + 1; op < opcode_end; op++)
+           {
+             if ((buffer[0] & op->mask[0]) != op->opcode[0])
+               break;
+
+             if ((buffer[1] & op->mask[1]) != op->opcode[1]
+                 || (buffer[2] & op->mask[2]) != op->opcode[2]
+                 || (buffer[3] & op->mask[3]) != op->opcode[3]
+                 || (buffer[4] & op->mask[4]) != op->opcode[4]
+                 || (buffer[5] & op->mask[5]) != op->opcode[5])
+               continue;
+
+             if (((int)opcode->mask[0] + opcode->mask[1] +
+                  opcode->mask[2] + opcode->mask[3] +
+                  opcode->mask[4] + opcode->mask[5]) <
+                 ((int)op->mask[0] + op->mask[1] +
+                  op->mask[2] + op->mask[3] +
+                  op->mask[4] + op->mask[5]))
+               opcode = op;
+           }
+
          /* The instruction is valid.  */
          if (opcode->operands[0] != 0)
            (*info->fprintf_func) (info->stream, "%s\t", opcode->name);