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144 lines
4.0 KiB
Plaintext
144 lines
4.0 KiB
Plaintext
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/* Generic opcode table support for targets using CGEN. -*- C -*-
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CGEN: Cpu tools GENerator
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This file is used to generate @arch@-opc.c.
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU Binutils and GDB, the GNU debugger.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "sysdep.h"
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#include <stdio.h>
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#include "ansidecl.h"
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#include "libiberty.h"
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#include "bfd.h"
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#include "symcat.h"
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#include "@arch@-opc.h"
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/* Look up instruction INSN_VALUE and extract its fields.
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If non-null INSN is the insn table entry.
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Otherwise INSN_VALUE is examined to compute it.
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LENGTH is the bit length of INSN_VALUE if known, otherwise 0.
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The result a pointer to the insn table entry, or NULL if the instruction
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wasn't recognized. */
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const CGEN_INSN *
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@arch@_cgen_lookup_insn (insn, insn_value, length, fields)
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const CGEN_INSN *insn;
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cgen_insn_t insn_value;
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int length;
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CGEN_FIELDS *fields;
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{
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char buf[4];
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if (!insn)
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{
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const CGEN_INSN_LIST *insn_list;
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#ifdef CGEN_INT_INSN
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switch (length)
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{
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case 8:
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buf[0] = insn_value;
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break;
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case 16:
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if (cgen_current_endian == CGEN_ENDIAN_BIG)
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bfd_putb16 (insn_value, buf);
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else
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bfd_putl16 (insn_value, buf);
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break;
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case 32:
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if (cgen_current_endian == CGEN_ENDIAN_BIG)
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bfd_putb32 (insn_value, buf);
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else
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bfd_putl32 (insn_value, buf);
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break;
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default:
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abort ();
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}
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#else
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abort (); /* FIXME: unfinished */
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#endif
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/* The instructions are stored in hash lists.
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Pick the first one and keep trying until we find the right one. */
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insn_list = CGEN_DIS_LOOKUP_INSN (buf, insn_value);
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while (insn_list != NULL)
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{
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insn = insn_list->insn;
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/* Basic bit mask must be correct. */
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/* ??? May wish to allow target to defer this check until the extract
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handler. */
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if ((insn_value & CGEN_INSN_MASK (insn)) == CGEN_INSN_VALUE (insn))
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{
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length = (*CGEN_EXTRACT_FN (insn)) (insn, NULL, insn_value, fields);
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if (length > 0)
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return insn;
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}
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insn_list = CGEN_DIS_NEXT_INSN (insn_list);
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}
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}
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else
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{
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length = (*CGEN_EXTRACT_FN (insn)) (insn, NULL, insn_value, fields);
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if (length > 0)
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return insn;
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}
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return NULL;
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}
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/* Fill in the operand instances used by insn INSN_VALUE.
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If non-null INS is the insn table entry.
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Otherwise INSN_VALUE is examined to compute it.
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LENGTH is the number of bits in INSN_VALUE if known, otherwise 0.
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INDICES is a pointer to a buffer of MAX_OPERANDS ints to be filled in.
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The result a pointer to the insn table entry, or NULL if the instruction
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wasn't recognized. */
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const CGEN_INSN *
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@arch@_cgen_get_insn_operands (insn, insn_value, length, indices)
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const CGEN_INSN *insn;
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cgen_insn_t insn_value;
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int length;
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int *indices;
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{
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CGEN_FIELDS fields;
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const CGEN_OPERAND_INSTANCE *opinst;
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int i;
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insn = @arch@_cgen_lookup_insn (insn, insn_value, length, &fields);
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if (! insn)
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return NULL;
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for (i = 0, opinst = CGEN_INSN_OPERANDS (insn);
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CGEN_OPERAND_INSTANCE_TYPE (opinst) != CGEN_OPERAND_INSTANCE_END;
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++i, ++opinst)
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{
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const CGEN_OPERAND *op = CGEN_OPERAND_INSTANCE_OPERAND (opinst);
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if (op == NULL)
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indices[i] = CGEN_OPERAND_INSTANCE_INDEX (opinst);
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else
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indices[i] = @arch@_cgen_get_operand (CGEN_OPERAND_INDEX (op), &fields);
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}
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return insn;
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}
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