/* CGEN generic disassembler support code.
+ Copyright (C) 1996-2019 Free Software Foundation, Inc.
- Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+ This file is part of libopcodes.
- 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
+ This library 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)
+ the Free Software Foundation; either version 3, 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.
+ It 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. */
+ 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
#include "sysdep.h"
#include <stdio.h>
#include "ansidecl.h"
#include "libiberty.h"
#include "bfd.h"
+#include "symcat.h"
#include "opcode/cgen.h"
-/* This is not published as part of the public interface so we don't
- declare this in cgen.h. */
-extern CGEN_OPCODE_DATA *cgen_current_opcode_data;
+static CGEN_INSN_LIST * hash_insn_array (CGEN_CPU_DESC, const CGEN_INSN *, int, int, CGEN_INSN_LIST **, CGEN_INSN_LIST *);
+static CGEN_INSN_LIST * hash_insn_list (CGEN_CPU_DESC, const CGEN_INSN_LIST *, CGEN_INSN_LIST **, CGEN_INSN_LIST *);
+static void build_dis_hash_table (CGEN_CPU_DESC);
+static int count_decodable_bits (const CGEN_INSN *);
+static void add_insn_to_hash_chain (CGEN_INSN_LIST *,
+ const CGEN_INSN *,
+ CGEN_INSN_LIST **,
+ unsigned int);
+
+/* Return the number of decodable bits in this insn. */
+static int
+count_decodable_bits (const CGEN_INSN *insn)
+{
+ unsigned mask = CGEN_INSN_BASE_MASK (insn);
+ int bits = 0;
+ unsigned m;
-/* Disassembler instruction hash table. */
-static CGEN_INSN_LIST **dis_hash_table;
+ for (m = 1; m != 0; m <<= 1)
+ {
+ if (mask & m)
+ ++bits;
+ }
+ return bits;
+}
-void
-cgen_dis_init ()
+/* Add an instruction to the hash chain. */
+static void
+add_insn_to_hash_chain (CGEN_INSN_LIST *hentbuf,
+ const CGEN_INSN *insn,
+ CGEN_INSN_LIST **htable,
+ unsigned int hash)
{
- if (dis_hash_table)
+ CGEN_INSN_LIST *current_buf;
+ CGEN_INSN_LIST *previous_buf;
+ int insn_decodable_bits;
+
+ /* Add insns sorted by the number of decodable bits, in decreasing order.
+ This ensures that any insn which is a special case of another will be
+ checked first. */
+ insn_decodable_bits = count_decodable_bits (insn);
+ previous_buf = NULL;
+ for (current_buf = htable[hash]; current_buf != NULL;
+ current_buf = current_buf->next)
{
- free (dis_hash_table);
- dis_hash_table = NULL;
+ int current_decodable_bits = count_decodable_bits (current_buf->insn);
+ if (insn_decodable_bits >= current_decodable_bits)
+ break;
+ previous_buf = current_buf;
}
-}
-/* Build the disassembler instruction hash table. */
+ /* Now insert the new insn. */
+ hentbuf->insn = insn;
+ hentbuf->next = current_buf;
+ if (previous_buf == NULL)
+ htable[hash] = hentbuf;
+ else
+ previous_buf->next = hentbuf;
+}
-static void
-build_dis_hash_table ()
+/* 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 (CGEN_CPU_DESC cd,
+ const CGEN_INSN * insns,
+ int count,
+ int entsize ATTRIBUTE_UNUSED,
+ CGEN_INSN_LIST ** htable,
+ CGEN_INSN_LIST * hentbuf)
{
+ int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;
int i;
- int big_p = cgen_current_endian == CGEN_ENDIAN_BIG;
- unsigned int hash;
- char buf[4];
- unsigned long value;
- int count = cgen_insn_count ();
- CGEN_OPCODE_DATA *data = cgen_current_opcode_data;
- CGEN_INSN_TABLE *insn_table = data->insn_table;
- unsigned int entry_size = insn_table->entry_size;
- unsigned int hash_size = insn_table->dis_hash_table_size;
- const CGEN_INSN *insn;
- CGEN_INSN_LIST *insn_lists,*new_insns;
- /* The space allocated for the hash table consists of two parts:
- the hash table and the hash lists. */
+ for (i = count - 1; i >= 0; --i, ++hentbuf)
+ {
+ unsigned int hash;
+ char buf [4];
+ unsigned long value;
+ const CGEN_INSN *insn = &insns[i];
- dis_hash_table = (CGEN_INSN_LIST **)
- xmalloc (hash_size * sizeof (CGEN_INSN_LIST *)
- + count * sizeof (CGEN_INSN_LIST));
- memset (dis_hash_table, 0,
- hash_size * sizeof (CGEN_INSN_LIST *)
- + count * sizeof (CGEN_INSN_LIST));
- insn_lists = (CGEN_INSN_LIST *) (dis_hash_table + hash_size);
+ if (! (* cd->dis_hash_p) (insn))
+ continue;
- /* Add compiled in insns.
- The table is scanned backwards as later additions are inserted in
- front of earlier ones and we want earlier ones to be prefered.
- We stop at the first one as it is a reserved entry.
- This is a bit tricky as the attribute member of CGEN_INSN is variable
- among architectures. This code could be moved to cgen-asm.in, but
- I prefer to keep it here for now. */
-
- for (insn = (CGEN_INSN *)
- ((char *) insn_table->init_entries
- + entry_size * (insn_table->num_init_entries - 1));
- insn > insn_table->init_entries;
- insn = (CGEN_INSN *) ((char *) insn - entry_size), ++insn_lists)
- {
/* We don't know whether the target uses the buffer or the base insn
to hash on, so set both up. */
- value = CGEN_INSN_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 = (*insn_table->dis_hash) (buf, value);
- insn_lists->next = dis_hash_table[hash];
- insn_lists->insn = insn;
- dis_hash_table[hash] = insn_lists;
+
+ value = CGEN_INSN_BASE_VALUE (insn);
+ bfd_put_bits ((bfd_vma) value,
+ buf,
+ CGEN_INSN_MASK_BITSIZE (insn),
+ big_p);
+ hash = (* cd->dis_hash) (buf, value);
+ add_insn_to_hash_chain (hentbuf, insn, htable, hash);
}
- /* Add runtime added insns.
- ??? Currently later added insns will be prefered over earlier ones.
- Not sure this is a bug or not. */
- for (new_insns = insn_table->new_entries;
- new_insns != NULL;
- new_insns = new_insns->next, ++insn_lists)
+ 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 (CGEN_CPU_DESC cd,
+ const CGEN_INSN_LIST *insns,
+ CGEN_INSN_LIST **htable,
+ CGEN_INSN_LIST *hentbuf)
+{
+ int big_p = CGEN_CPU_INSN_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_VALUE (new_insns->insn);
- switch (CGEN_INSN_MASK_BITSIZE (new_insns->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 = (*insn_table->dis_hash) (buf, value);
- insn_lists->next = dis_hash_table[hash];
- insn_lists->insn = new_insns->insn;
- dis_hash_table[hash] = insn_lists;
+
+ value = CGEN_INSN_BASE_VALUE (ilist->insn);
+ bfd_put_bits((bfd_vma) value,
+ buf,
+ CGEN_INSN_MASK_BITSIZE (ilist->insn),
+ big_p);
+ hash = (* cd->dis_hash) (buf, value);
+ add_insn_to_hash_chain (hentbuf, ilist->insn, htable, hash);
}
+
+ return hentbuf;
+}
+
+/* Build the disassembler instruction hash table. */
+
+static void
+build_dis_hash_table (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 (buf, value)
- const char *buf;
- unsigned long value;
+cgen_dis_lookup_insn (CGEN_CPU_DESC cd, const char * buf, CGEN_INSN_INT value)
{
unsigned int hash;
- if (dis_hash_table == NULL)
- build_dis_hash_table ();
+ if (cd->dis_hash_table == NULL)
+ build_dis_hash_table (cd);
+
+ hash = (* cd->dis_hash) (buf, value);
- hash = (*cgen_current_opcode_data->insn_table->dis_hash) (buf, value);
- return dis_hash_table[hash];
+ return cd->dis_hash_table[hash];
}
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