Initial revision

1 files changed, 226 insertions, 0 deletions

diff --git a/opcodes/cgen-dis.c b/opcodes/cgen-dis.c
new file mode 100644
index 0000000000..78b1cd90ed
--- /dev/null
+++ b/opcodes/cgen-dis.c
@@ -0,0 +1,226 @@
+/* CGEN generic disassembler support code.
+
+   Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+
+   This file is part of the GNU Binutils and GDB, the GNU debugger.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this program; if not, write to the Free Software Foundation, Inc.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "sysdep.h"
+#include <stdio.h>
+#include "ansidecl.h"
+#include "libiberty.h"
+#include "bfd.h"
+#include "symcat.h"
+#include "opcode/cgen.h"
+
+/* Subroutine of build_dis_hash_table to add INSNS to the hash table.
+
+   COUNT is the number of elements in INSNS.
+   ENTSIZE is sizeof (CGEN_IBASE) for the target.
+   ??? No longer used but leave in for now.
+   HTABLE points to the hash table.
+   HENTBUF is a pointer to sufficiently large buffer of hash entries.
+   The result is a pointer to the next entry to use.
+
+   The table is scanned backwards as additions are made to the front of the
+   list and we want earlier ones to be prefered.  */
+
+static CGEN_INSN_LIST *
+hash_insn_array (cd, insns, count, entsize, htable, hentbuf)
+     CGEN_CPU_DESC cd;
+     const CGEN_INSN * insns;
+     int count;
+     int entsize;
+     CGEN_INSN_LIST ** htable;
+     CGEN_INSN_LIST * hentbuf;
+{
+  int big_p = CGEN_CPU_ENDIAN (cd) == CGEN_ENDIAN_BIG;
+  int i;
+
+  for (i = count - 1; i >= 0; --i, ++hentbuf)
+    {
+      unsigned int hash;
+      char buf [4];
+      unsigned long value;
+      const CGEN_INSN *insn = &insns[i];
+
+      if (! (* cd->dis_hash_p) (insn))
+	continue;
+
+      /* We don't know whether the target uses the buffer or the base insn
+	 to hash on, so set both up.  */
+
+      value = CGEN_INSN_BASE_VALUE (insn);
+      switch (CGEN_INSN_MASK_BITSIZE (insn))
+	{
+	case 8:
+	  buf[0] = value;
+	  break;
+	case 16:
+	  if (big_p)
+	    bfd_putb16 ((bfd_vma) value, buf);
+	  else
+	    bfd_putl16 ((bfd_vma) value, buf);
+	  break;
+	case 32:
+	  if (big_p)
+	    bfd_putb32 ((bfd_vma) value, buf);
+	  else
+	    bfd_putl32 ((bfd_vma) value, buf);
+	  break;
+	default:
+	  abort ();
+	}
+
+      hash = (* cd->dis_hash) (buf, value);
+      hentbuf->next = htable[hash];
+      hentbuf->insn = insn;
+      htable[hash] = hentbuf;
+    }
+
+  return hentbuf;
+}
+
+/* Subroutine of build_dis_hash_table to add INSNS to the hash table.
+   This function is identical to hash_insn_array except the insns are
+   in a list.  */
+
+static CGEN_INSN_LIST *
+hash_insn_list (cd, insns, htable, hentbuf)
+     CGEN_CPU_DESC cd;
+     const CGEN_INSN_LIST *insns;
+     CGEN_INSN_LIST **htable;
+     CGEN_INSN_LIST *hentbuf;
+{
+  int big_p = CGEN_CPU_ENDIAN (cd) == CGEN_ENDIAN_BIG;
+  const CGEN_INSN_LIST *ilist;
+
+  for (ilist = insns; ilist != NULL; ilist = ilist->next, ++ hentbuf)
+    {
+      unsigned int hash;
+      char buf[4];
+      unsigned long value;
+
+      if (! (* cd->dis_hash_p) (ilist->insn))
+	continue;
+
+      /* We don't know whether the target uses the buffer or the base insn
+	 to hash on, so set both up.  */
+
+      value = CGEN_INSN_BASE_VALUE (ilist->insn);
+      switch (CGEN_INSN_MASK_BITSIZE (ilist->insn))
+	{
+	case 8:
+	  buf[0] = value;
+	  break;
+	case 16:
+	  if (big_p)
+	    bfd_putb16 ((bfd_vma) value, buf);
+	  else
+	    bfd_putl16 ((bfd_vma) value, buf);
+	  break;
+	case 32:
+	  if (big_p)
+	    bfd_putb32 ((bfd_vma) value, buf);
+	  else
+	    bfd_putl32 ((bfd_vma) value, buf);
+	  break;
+	default:
+	  abort ();
+	}
+
+      hash = (* cd->dis_hash) (buf, value);
+      hentbuf->next = htable [hash];
+      hentbuf->insn = ilist->insn;
+      htable [hash] = hentbuf;
+    }
+
+  return hentbuf;
+}
+
+/* Build the disassembler instruction hash table.  */
+
+static void
+build_dis_hash_table (cd)
+     CGEN_CPU_DESC cd;
+{
+  int count = cgen_insn_count (cd) + cgen_macro_insn_count (cd);
+  CGEN_INSN_TABLE *insn_table = & cd->insn_table;
+  CGEN_INSN_TABLE *macro_insn_table = & cd->macro_insn_table;
+  unsigned int hash_size = cd->dis_hash_size;
+  CGEN_INSN_LIST *hash_entry_buf;
+  CGEN_INSN_LIST **dis_hash_table;
+  CGEN_INSN_LIST *dis_hash_table_entries;
+
+  /* The space allocated for the hash table consists of two parts:
+     the hash table and the hash lists.  */
+
+  dis_hash_table = (CGEN_INSN_LIST **)
+    xmalloc (hash_size * sizeof (CGEN_INSN_LIST *));
+  memset (dis_hash_table, 0, hash_size * sizeof (CGEN_INSN_LIST *));
+  dis_hash_table_entries = hash_entry_buf = (CGEN_INSN_LIST *)
+    xmalloc (count * sizeof (CGEN_INSN_LIST));
+
+  /* Add compiled in insns.
+     Don't include the first one as it is a reserved entry.  */
+  /* ??? It was the end of all hash chains, and also the special
+     "invalid insn" marker.  May be able to do it differently now.  */
+
+  hash_entry_buf = hash_insn_array (cd,
+				    insn_table->init_entries + 1,
+				    insn_table->num_init_entries - 1,
+				    insn_table->entry_size,
+				    dis_hash_table, hash_entry_buf);
+
+  /* Add compiled in macro-insns.  */
+
+  hash_entry_buf = hash_insn_array (cd, macro_insn_table->init_entries,
+				    macro_insn_table->num_init_entries,
+				    macro_insn_table->entry_size,
+				    dis_hash_table, hash_entry_buf);
+
+  /* Add runtime added insns.
+     Later added insns will be prefered over earlier ones.  */
+
+  hash_entry_buf = hash_insn_list (cd, insn_table->new_entries,
+				   dis_hash_table, hash_entry_buf);
+
+  /* Add runtime added macro-insns.  */
+
+  hash_insn_list (cd, macro_insn_table->new_entries,
+		  dis_hash_table, hash_entry_buf);
+
+  cd->dis_hash_table = dis_hash_table;
+  cd->dis_hash_table_entries = dis_hash_table_entries;
+}
+
+/* Return the first entry in the hash list for INSN.  */
+
+CGEN_INSN_LIST *
+cgen_dis_lookup_insn (cd, buf, value)
+     CGEN_CPU_DESC cd;
+     const char * buf;
+     CGEN_INSN_INT value;
+{
+  unsigned int hash;
+
+  if (cd->dis_hash_table == NULL)
+    build_dis_hash_table (cd);
+
+  hash = (* cd->dis_hash) (buf, value);
+
+  return cd->dis_hash_table[hash];
+}