/* CGEN generic disassembler support code.
+ Copyright (C) 1996-2020 Free Software Foundation, Inc.
- Copyright 1996, 1997, 1998, 1999, 2000, 2001
- 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 "symcat.h"
#include "opcode/cgen.h"
-static CGEN_INSN_LIST * hash_insn_array PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, int, int, CGEN_INSN_LIST **, CGEN_INSN_LIST *));
-static CGEN_INSN_LIST * hash_insn_list PARAMS ((CGEN_CPU_DESC, const CGEN_INSN_LIST *, CGEN_INSN_LIST **, CGEN_INSN_LIST *));
-static void build_dis_hash_table PARAMS ((CGEN_CPU_DESC));
-
+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;
+
+ for (m = 1; m != 0; m <<= 1)
+ {
+ if (mask & m)
+ ++bits;
+ }
+ return bits;
+}
+
+/* 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)
+{
+ 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)
+ {
+ int current_decodable_bits = count_decodable_bits (current_buf->insn);
+ if (insn_decodable_bits >= current_decodable_bits)
+ break;
+ previous_buf = current_buf;
+ }
+
+ /* Now insert the new insn. */
+ hentbuf->insn = insn;
+ hentbuf->next = current_buf;
+ if (previous_buf == NULL)
+ htable[hash] = hentbuf;
+ else
+ previous_buf->next = hentbuf;
+}
+
/* Subroutine of build_dis_hash_table to add INSNS to the hash table.
COUNT is the number of elements in INSNS.
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 ATTRIBUTE_UNUSED;
- CGEN_INSN_LIST ** htable;
- CGEN_INSN_LIST * hentbuf;
+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_ENDIAN (cd) == CGEN_ENDIAN_BIG;
+ int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;
int i;
for (i = count - 1; i >= 0; --i, ++hentbuf)
CGEN_INSN_MASK_BITSIZE (insn),
big_p);
hash = (* cd->dis_hash) (buf, value);
- hentbuf->next = htable[hash];
- hentbuf->insn = insn;
- htable[hash] = hentbuf;
+ add_insn_to_hash_chain (hentbuf, insn, htable, hash);
}
return hentbuf;
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;
+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_ENDIAN (cd) == CGEN_ENDIAN_BIG;
+ 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)
CGEN_INSN_MASK_BITSIZE (ilist->insn),
big_p);
hash = (* cd->dis_hash) (buf, value);
- hentbuf->next = htable [hash];
- hentbuf->insn = ilist->insn;
- htable [hash] = hentbuf;
+ add_insn_to_hash_chain (hentbuf, ilist->insn, htable, hash);
}
return hentbuf;
/* Build the disassembler instruction hash table. */
static void
-build_dis_hash_table (cd)
- CGEN_CPU_DESC cd;
+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;
/* 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;
+cgen_dis_lookup_insn (CGEN_CPU_DESC cd, const char * buf, CGEN_INSN_INT value)
{
unsigned int hash;
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