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410 lines
12 KiB
C
410 lines
12 KiB
C
/* The IGEN simulator generator for GDB, the GNU Debugger.
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Copyright 2002-2018 Free Software Foundation, Inc.
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Contributed by Andrew Cagney.
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This file is part of GDB.
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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 3 of the License, or
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(at your option) 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, see <http://www.gnu.org/licenses/>. */
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/* load the opcode stat structure */
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#include "misc.h"
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#include "lf.h"
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#include "table.h"
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#include "filter.h"
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#include "igen.h"
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#include "ld-decode.h"
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#ifndef NULL
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#define NULL 0
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#endif
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static const name_map decode_type_map[] = {
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{"normal", normal_decode_rule},
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{"boolean", boolean_rule},
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{NULL, normal_decode_rule},
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};
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static const name_map decode_gen_map[] = {
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{"array", array_gen},
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{"switch", switch_gen},
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{"padded-switch", padded_switch_gen},
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{"goto-switch", goto_switch_gen},
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{NULL, -1},
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};
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static const name_map decode_reserved_map[] = {
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{"zero-reserved", 1},
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{NULL, 0},
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};
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static const name_map decode_duplicates_map[] = {
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{"duplicate", 1},
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{NULL, 0},
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};
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static const name_map decode_combine_map[] = {
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{"combine", 1},
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{NULL, 0},
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};
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static const name_map decode_search_map[] = {
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{"constants", decode_find_constants},
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{"mixed", decode_find_mixed},
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{"strings", decode_find_strings},
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{NULL, decode_find_mixed},
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};
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static void
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set_bits (int bit[max_insn_bit_size], unsigned64 value)
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{
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int bit_nr;
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for (bit_nr = 0; bit_nr < max_insn_bit_size; bit_nr++)
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{
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if (bit_nr < options.insn_bit_size)
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bit[bit_nr] = (value >> (options.insn_bit_size - bit_nr - 1)) & 1;
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else
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bit[bit_nr] = 0;
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}
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}
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decode_table *
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load_decode_table (char *file_name)
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{
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table *file = table_open (file_name);
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table_entry *entry;
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decode_table *table = NULL;
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decode_table **curr_rule = &table;
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while ((entry = table_read (file)) != NULL)
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{
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char *decode_options = entry->field[decode_options_field];
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decode_table *new_rule = ZALLOC (decode_table);
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if (entry->nr_fields < min_nr_decode_fields)
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error (entry->line, "Missing decode table fields\n");
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new_rule->line = entry->line;
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/* the options field */
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new_rule->type = name2i (decode_options, decode_type_map);
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if (options.decode.overriding_gen != NULL)
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new_rule->gen =
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name2i (options.decode.overriding_gen, decode_gen_map);
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else
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new_rule->gen = name2i (decode_options, decode_gen_map);
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if (new_rule->gen == padded_switch_gen && options.decode.switch_as_goto)
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new_rule->gen = goto_switch_gen;
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if (options.decode.zero_reserved)
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new_rule->with_zero_reserved = 1;
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else
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new_rule->with_zero_reserved =
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name2i (decode_options, decode_reserved_map);
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if (options.decode.duplicate)
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new_rule->with_duplicates = 1;
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else
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new_rule->with_duplicates =
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name2i (decode_options, decode_duplicates_map);
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if (options.decode.combine)
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new_rule->with_combine = 1;
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else
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new_rule->with_combine = name2i (decode_options, decode_combine_map);
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if (new_rule->type == boolean_rule)
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{
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char *chp = decode_options;
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while (*chp != '\0')
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{
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if (isdigit (*chp))
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{
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new_rule->constant = a2i (chp);
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break;
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}
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chp = skip_to_separator (chp, ",");
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chp = skip_spaces (chp);
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}
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}
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/* First and last */
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if (entry->nr_fields > decode_first_field
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&& strlen (entry->field[decode_first_field]) > 0)
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{
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new_rule->first = target_a2i (options.hi_bit_nr,
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entry->field[decode_first_field]);
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if (new_rule->first < 0 || new_rule->first >= options.insn_bit_size)
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error (new_rule->line, "First field out of range\n");
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}
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else
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new_rule->first = 0;
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if (entry->nr_fields > decode_last_field
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&& strlen (entry->field[decode_last_field]) > 0)
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{
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new_rule->last = target_a2i (options.hi_bit_nr,
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entry->field[decode_last_field]);
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if (new_rule->last < 0 || new_rule->last >= options.insn_bit_size)
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error (new_rule->line, "Last field out of range\n");
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}
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else
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new_rule->last = options.insn_bit_size - 1;
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if (new_rule->first > new_rule->last)
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error (new_rule->line, "First must preceed last\n");
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/* force first/last, with default values based on first/last */
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if (entry->nr_fields > decode_force_first_field
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&& strlen (entry->field[decode_force_first_field]) > 0)
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{
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new_rule->force_first = target_a2i (options.hi_bit_nr,
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entry->
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field
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[decode_force_first_field]);
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if (new_rule->force_first < new_rule->first
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|| new_rule->force_first > new_rule->last + 1)
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error (new_rule->line, "Force first out of range\n");
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}
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else
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new_rule->force_first = new_rule->last + 1;
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if (entry->nr_fields > decode_force_last_field
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&& strlen (entry->field[decode_force_last_field]) > 0)
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{
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new_rule->force_last = target_a2i (options.hi_bit_nr,
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entry->
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field[decode_force_last_field]);
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if (new_rule->force_last > new_rule->last
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|| new_rule->force_last < new_rule->first - 1)
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error (new_rule->line, "Force-last out of range\n");
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}
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else
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new_rule->force_last = new_rule->first - 1;
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/* fields to be treated as constant */
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if (entry->nr_fields > decode_constant_field_names_field)
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filter_parse (&new_rule->constant_field_names,
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entry->field[decode_constant_field_names_field]);
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/* applicable word nr */
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if (entry->nr_fields > decode_word_nr_field)
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new_rule->word_nr = a2i (entry->field[decode_word_nr_field]);
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/* required instruction format names */
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if (entry->nr_fields > decode_format_names_field)
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filter_parse (&new_rule->format_names,
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entry->field[decode_format_names_field]);
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/* required processor models */
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if (entry->nr_fields > decode_model_names_field)
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filter_parse (&new_rule->model_names,
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entry->field[decode_model_names_field]);
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/* required paths */
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if (entry->nr_fields > decode_paths_field
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&& strlen (entry->field[decode_paths_field]) > 0)
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{
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decode_path_list **last = &new_rule->paths;
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char *chp = entry->field[decode_paths_field];
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do
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{
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(*last) = ZALLOC (decode_path_list);
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/* extra root/zero entry */
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(*last)->path = ZALLOC (decode_path);
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do
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{
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decode_path *entry = ZALLOC (decode_path);
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entry->opcode_nr = a2i (chp);
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entry->parent = (*last)->path;
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(*last)->path = entry;
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chp = skip_digits (chp);
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chp = skip_spaces (chp);
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}
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while (*chp == '.');
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last = &(*last)->next;
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}
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while (*chp == ',');
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if (*chp != '\0')
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error (entry->line, "Invalid path field\n");
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}
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/* collect up the list of optional special conditions applicable
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to the rule */
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{
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int field_nr = nr_decode_fields;
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while (entry->nr_fields > field_nr)
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{
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decode_cond *cond = ZALLOC (decode_cond);
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decode_cond **last;
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if (entry->nr_fields > field_nr + decode_cond_mask_field)
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set_bits (cond->mask,
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a2i (entry->
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field[field_nr + decode_cond_mask_field]));
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if (entry->nr_fields > field_nr + decode_cond_value_field)
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{
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if (entry->field[field_nr + decode_cond_value_field][0] ==
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'!')
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{
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cond->is_equal = 0;
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set_bits (cond->value,
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a2i (entry->
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field[field_nr + decode_cond_value_field] +
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1));
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}
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else
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{
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cond->is_equal = 1;
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set_bits (cond->value,
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a2i (entry->
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field[field_nr +
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decode_cond_value_field]));
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}
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}
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if (entry->nr_fields > field_nr + decode_cond_word_nr_field)
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cond->word_nr =
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a2i (entry->field[field_nr + decode_cond_word_nr_field]);
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field_nr += nr_decode_cond_fields;
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/* insert it */
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last = &new_rule->conditions;
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while (*last != NULL)
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last = &(*last)->next;
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*last = cond;
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}
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}
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*curr_rule = new_rule;
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curr_rule = &new_rule->next;
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}
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return table;
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}
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int
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decode_table_max_word_nr (decode_table *entry)
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{
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int max_word_nr = 0;
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while (entry != NULL)
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{
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decode_cond *cond;
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if (entry->word_nr > max_word_nr)
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max_word_nr = entry->word_nr;
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for (cond = entry->conditions; cond != NULL; cond = cond->next)
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{
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if (cond->word_nr > max_word_nr)
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max_word_nr = cond->word_nr;
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}
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entry = entry->next;
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}
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return max_word_nr;
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}
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static void
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dump_decode_cond (lf *file, char *prefix, decode_cond *cond, char *suffix)
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{
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lf_printf (file, "%s(decode_cond *) 0x%lx", prefix, (long) cond);
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if (cond != NULL)
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{
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lf_indent (file, +1);
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lf_printf (file, "\n(word_nr %d)", cond->word_nr);
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lf_printf (file, "\n(mask 0x%lx)", (long) cond->mask);
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lf_printf (file, "\n(value 0x%lx)", (long) cond->value);
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lf_printf (file, "\n(is_equal 0x%lx)", (long) cond->is_equal);
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lf_printf (file, "\n(next (decode_cond *) 0%lx)", (long) cond->next);
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lf_indent (file, -1);
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}
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lf_printf (file, "%s", suffix);
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}
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static void
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dump_decode_conds (lf *file, char *prefix, decode_cond *cond, char *suffix)
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{
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lf_printf (file, "%s(decode_cond *) 0x%lx", prefix, (long) cond);
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while (cond != NULL)
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{
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dump_decode_cond (file, "\n(", cond, ")");
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cond = cond->next;
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}
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lf_printf (file, "%s", suffix);
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}
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void
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dump_decode_rule (lf *file, char *prefix, decode_table *rule, char *suffix)
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{
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lf_printf (file, "%s(decode_table *) 0x%lx", prefix, (long) rule);
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if (rule != NULL)
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{
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lf_indent (file, +1);
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dump_line_ref (file, "\n(line ", rule->line, ")");
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lf_printf (file, "\n(type %s)", i2name (rule->type, decode_type_map));
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lf_printf (file, "\n(gen %s)", i2name (rule->gen, decode_gen_map));
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lf_printf (file, "\n(first %d)", rule->first);
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lf_printf (file, "\n(last %d)", rule->last);
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lf_printf (file, "\n(force_first %d)", rule->force_first);
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lf_printf (file, "\n(force_last %d)", rule->force_last);
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dump_filter (file, "\n(constant_field_names \"",
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rule->constant_field_names, "\")");
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lf_printf (file, "\n(constant 0x%x)", rule->constant);
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lf_printf (file, "\n(word_nr %d)", rule->word_nr);
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lf_printf (file, "\n(with_zero_reserved %d)", rule->with_zero_reserved);
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lf_printf (file, "\n(with_duplicates %d)", rule->with_duplicates);
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lf_printf (file, "\n(with_combine %d)", rule->with_combine);
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dump_filter (file, "\n(format_names \"", rule->format_names, "\")");
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dump_filter (file, "\n(model_names \"", rule->model_names, "\")");
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dump_decode_conds (file, "\n(conditions ", rule->conditions, ")");
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lf_printf (file, "\n(next 0x%lx)", (long) rule->next);
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lf_indent (file, -1);
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}
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lf_printf (file, "%s", suffix);
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}
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#ifdef MAIN
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static void
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dump_decode_rules (lf *file, char *prefix, decode_table *rule, char *suffix)
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{
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lf_printf (file, "%s", prefix);
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while (rule != NULL)
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{
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lf_indent (file, +1);
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dump_decode_rule (file, "\n(", rule, ")");
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lf_indent (file, -1);
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rule = rule->next;
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}
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lf_printf (file, "%s", suffix);
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}
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igen_options options;
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int
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main (int argc, char **argv)
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{
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lf *l;
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decode_table *rules;
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INIT_OPTIONS (options);
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if (argc != 3)
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error (NULL, "Usage: decode <decode-file> <hi-bit-nr>\n");
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options.hi_bit_nr = a2i (argv[2]);
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rules = load_decode_table (argv[1]);
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l = lf_open ("-", "stdout", lf_omit_references, lf_is_text, "tmp-ld-insn");
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dump_decode_rules (l, "(rules ", rules, ")\n");
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return 0;
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}
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#endif
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