1546 lines
46 KiB
C
1546 lines
46 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
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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 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, 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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*/
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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 "ld-decode.h"
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#include "ld-cache.h"
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#include "ld-insn.h"
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#include "igen.h"
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#include "gen-idecode.h"
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#include "gen-icache.h"
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#include "gen-semantics.h"
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static void
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lf_print_opcodes(lf *file,
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insn_table *table)
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{
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if (table != NULL) {
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while (1) {
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ASSERT(table->opcode != NULL);
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lf_printf(file, "_%d_%d",
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table->opcode->first,
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table->opcode->last);
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if (table->parent == NULL) break;
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lf_printf(file, "__%d", table->opcode_nr);
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table = table->parent;
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}
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}
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}
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/****************************************************************/
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static void
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lf_print_table_name(lf *file,
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insn_table *table)
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{
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lf_printf(file, "idecode_table");
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lf_print_opcodes(file, table);
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}
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static void
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print_idecode_table(lf *file,
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insn_table *entry,
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const char *result)
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{
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lf_printf(file, "/* prime the search */\n");
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lf_printf(file, "idecode_table_entry *table = ");
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lf_print_table_name(file, entry);
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lf_printf(file, ";\n");
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lf_printf(file, "int opcode = EXTRACTED32(instruction, %d, %d);\n",
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i2target(hi_bit_nr, entry->opcode->first),
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i2target(hi_bit_nr, entry->opcode->last));
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lf_printf(file, "idecode_table_entry *table_entry = table + opcode;\n");
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lf_printf(file, "\n");
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lf_printf(file, "/* iterate until a leaf */\n");
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lf_printf(file, "while (1) {\n");
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lf_printf(file, " signed shift = table_entry->shift;\n");
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lf_printf(file, "if (shift == function_entry) break;\n");
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lf_printf(file, " if (shift >= 0) {\n");
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lf_printf(file, " table = ((idecode_table_entry*)\n");
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lf_printf(file, " table_entry->function_or_table);\n");
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lf_printf(file, " opcode = ((instruction & table_entry->mask)\n");
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lf_printf(file, " >> shift);\n");
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lf_printf(file, " table_entry = table + opcode;\n");
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lf_printf(file, " }\n");
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lf_printf(file, " else {\n");
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lf_printf(file, " /* must be a boolean */\n");
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lf_printf(file, " ASSERT(table_entry->shift == boolean_entry);\n");
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lf_printf(file, " opcode = ((instruction & table_entry->mask)\n");
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lf_printf(file, " != table_entry->value);\n");
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lf_printf(file, " table = ((idecode_table_entry*)\n");
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lf_printf(file, " table_entry->function_or_table);\n");
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lf_printf(file, " table_entry = table + opcode;\n");
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lf_printf(file, " }\n");
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lf_printf(file, "}\n");
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lf_printf(file, "\n");
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lf_printf(file, "/* call the leaf code */\n");
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if ((code & generate_jumps)) {
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lf_printf(file, "goto *table_entry->function_or_table;\n");
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}
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else {
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lf_printf(file, "%s ", result);
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if ((code & generate_with_icache)) {
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lf_printf(file, "(((idecode_icache*)table_entry->function_or_table)\n");
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lf_printf(file, " (%s));\n", ICACHE_FUNCTION_ACTUAL);
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}
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else {
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lf_printf(file, "((idecode_semantic*)table_entry->function_or_table)\n");
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lf_printf(file, " (%s);\n", SEMANTIC_FUNCTION_ACTUAL);
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}
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}
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}
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static void
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print_idecode_table_start(insn_table *table,
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lf *file,
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void *data,
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int depth)
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{
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ASSERT(depth == 0);
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/* start of the table */
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if (table->opcode_rule->gen == array_gen) {
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lf_printf(file, "\n");
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lf_printf(file, "static idecode_table_entry ");
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lf_print_table_name(file, table);
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lf_printf(file, "[] = {\n");
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}
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}
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static void
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print_idecode_table_leaf(insn_table *entry,
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lf *file,
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void *data,
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insn *instruction,
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int depth)
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{
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ASSERT(entry->parent != NULL);
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ASSERT(depth == 0);
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/* add an entry to the table */
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if (entry->parent->opcode_rule->gen == array_gen) {
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lf_printf(file, " /*%d*/ { ", entry->opcode_nr);
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if (entry->opcode == NULL) {
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/* table leaf entry */
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lf_printf(file, "function_entry, 0, 0, ");
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if ((code & generate_jumps))
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lf_printf(file, "&&");
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print_function_name(file,
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entry->insns->file_entry->fields[insn_name],
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entry->expanded_bits,
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((code & generate_with_icache)
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? function_name_prefix_icache
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: function_name_prefix_semantics));
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}
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else if (entry->opcode_rule->gen == switch_gen
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|| entry->opcode_rule->gen == goto_switch_gen
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|| entry->opcode_rule->gen == padded_switch_gen) {
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/* table calling switch statement */
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lf_printf(file, "function_entry, 0, 0, ");
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if ((code & generate_jumps))
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lf_printf(file, "&&");
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lf_print_table_name(file, entry);
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}
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else if (entry->opcode->is_boolean) {
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/* table `calling' boolean table */
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lf_printf(file, "boolean_entry, ");
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lf_printf(file, "MASK32(%d, %d), ",
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i2target(hi_bit_nr, entry->opcode->first),
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i2target(hi_bit_nr, entry->opcode->last));
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lf_printf(file, "INSERTED32(%d, %d, %d), ",
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entry->opcode->boolean_constant,
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i2target(hi_bit_nr, entry->opcode->first),
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i2target(hi_bit_nr, entry->opcode->last));
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lf_print_table_name(file, entry);
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}
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else {
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/* table `calling' another table */
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lf_printf(file, "%d, ", insn_bit_size - entry->opcode->last - 1);
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lf_printf(file, "MASK32(%d,%d), ",
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i2target(hi_bit_nr, entry->opcode->first),
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i2target(hi_bit_nr, entry->opcode->last));
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lf_printf(file, "0, ");
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lf_print_table_name(file, entry);
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}
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lf_printf(file, " },\n");
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}
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}
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static void
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print_idecode_table_end(insn_table *table,
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lf *file,
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void *data,
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int depth)
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{
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ASSERT(depth == 0);
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if (table->opcode_rule->gen == array_gen) {
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lf_printf(file, "};\n");
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}
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}
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static void
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print_idecode_table_padding(insn_table *table,
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lf *file,
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void *data,
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int depth,
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int opcode_nr)
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{
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ASSERT(depth == 0);
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if (table->opcode_rule->gen == array_gen) {
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lf_printf(file, " /*%d*/ { function_entry, 0, 0, ", opcode_nr);
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if ((code & generate_jumps))
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lf_printf(file, "&&");
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lf_printf(file, "%s_illegal },\n",
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((code & generate_with_icache) ? "icache" : "semantic"));
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}
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}
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/****************************************************************/
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static void
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print_goto_switch_name(lf *file,
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insn_table *entry)
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{
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lf_printf(file, "case_");
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if (entry->opcode == NULL)
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print_function_name(file,
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entry->insns->file_entry->fields[insn_name],
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entry->expanded_bits,
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((code & generate_with_icache)
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? function_name_prefix_icache
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: function_name_prefix_semantics));
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else
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lf_print_table_name(file, entry);
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}
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static void
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print_goto_switch_table_leaf(insn_table *entry,
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lf *file,
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void *data,
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insn *instruction,
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int depth)
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{
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ASSERT(entry->parent != NULL);
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ASSERT(depth == 0);
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ASSERT(entry->parent->opcode_rule->gen == goto_switch_gen);
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ASSERT(entry->parent->opcode);
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lf_printf(file, "&&");
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print_goto_switch_name(file, entry);
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lf_printf(file, ",\n");
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}
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static void
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print_goto_switch_table_padding(insn_table *table,
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lf *file,
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void *data,
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int depth,
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int opcode_nr)
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{
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ASSERT(depth == 0);
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ASSERT(table->opcode_rule->gen == goto_switch_gen);
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lf_printf(file, "&&illegal_");
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lf_print_table_name(file, table);
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lf_printf(file, ",\n");
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}
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static void
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print_goto_switch_break(lf *file,
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insn_table *entry)
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{
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lf_printf(file, "goto break_");
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lf_print_table_name(file, entry->parent);
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lf_printf(file, ";\n");
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}
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static void
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print_goto_switch_table(lf *file,
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insn_table *table)
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{
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lf_printf(file, "const static void *");
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lf_print_table_name(file, table);
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lf_printf(file, "[] = {\n");
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lf_indent(file, +2);
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insn_table_traverse_tree(table,
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file, NULL/*data*/,
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0,
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NULL/*start*/,
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print_goto_switch_table_leaf,
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NULL/*end*/,
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print_goto_switch_table_padding);
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lf_indent(file, -2);
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lf_printf(file, "};\n");
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}
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void print_idecode_switch
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(lf *file,
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insn_table *table,
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const char *result);
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static void
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idecode_switch_start(insn_table *table,
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lf *file,
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void *data,
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int depth)
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{
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/* const char *result = data; */
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ASSERT(depth == 0);
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ASSERT(table->opcode_rule->gen == switch_gen
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|| table->opcode_rule->gen == goto_switch_gen
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|| table->opcode_rule->gen == padded_switch_gen);
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if (table->opcode->is_boolean
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|| table->opcode_rule->gen == switch_gen
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|| table->opcode_rule->gen == padded_switch_gen) {
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lf_printf(file, "switch (EXTRACTED32(instruction, %d, %d)) {\n",
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i2target(hi_bit_nr, table->opcode->first),
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i2target(hi_bit_nr, table->opcode->last));
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}
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else if (table->opcode_rule->gen == goto_switch_gen) {
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if (table->parent != NULL
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&& (table->parent->opcode_rule->gen == switch_gen
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|| table->parent->opcode_rule->gen == goto_switch_gen
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|| table->parent->opcode_rule->gen == padded_switch_gen)) {
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lf_printf(file, "{\n");
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lf_indent(file, +2);
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}
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print_goto_switch_table(file, table);
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lf_printf(file, "ASSERT(EXTRACTED32(instruction, %d, %d)\n",
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i2target(hi_bit_nr, table->opcode->first),
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i2target(hi_bit_nr, table->opcode->last));
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lf_printf(file, " < (sizeof(");
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lf_print_table_name(file, table);
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lf_printf(file, ") / sizeof(void*)));\n");
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lf_printf(file, "goto *");
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lf_print_table_name(file, table);
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lf_printf(file, "[EXTRACTED32(instruction, %d, %d)];\n",
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i2target(hi_bit_nr, table->opcode->first),
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i2target(hi_bit_nr, table->opcode->last));
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}
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else {
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ASSERT("bad switch" == NULL);
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}
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}
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static void
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idecode_switch_leaf(insn_table *entry,
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lf *file,
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void *data,
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insn *instruction,
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int depth)
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{
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const char *result = data;
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ASSERT(entry->parent != NULL);
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ASSERT(depth == 0);
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ASSERT(entry->parent->opcode_rule->gen == switch_gen
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|| entry->parent->opcode_rule->gen == goto_switch_gen
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|| entry->parent->opcode_rule->gen == padded_switch_gen);
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ASSERT(entry->parent->opcode);
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if (entry->parent->opcode->is_boolean
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&& entry->opcode_nr == 0) {
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/* boolean false target */
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lf_printf(file, "case %d:\n", entry->parent->opcode->boolean_constant);
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}
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else if (entry->parent->opcode->is_boolean
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&& entry->opcode_nr != 0) {
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/* boolean true case */
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lf_printf(file, "default:\n");
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}
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else if (entry->parent->opcode_rule->gen == switch_gen
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|| entry->parent->opcode_rule->gen == padded_switch_gen) {
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/* normal goto */
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lf_printf(file, "case %d:\n", entry->opcode_nr);
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}
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else if (entry->parent->opcode_rule->gen == goto_switch_gen) {
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/* lf_indent(file, -1); */
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print_goto_switch_name(file, entry);
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lf_printf(file, ":\n");
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/* lf_indent(file, +1); */
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}
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else {
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ASSERT("bad switch" == NULL);
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}
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lf_indent(file, +2);
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{
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if (entry->opcode == NULL) {
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/* switch calling leaf */
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if ((code & generate_jumps))
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lf_printf(file, "goto ");
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if ((code & generate_calls))
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lf_printf(file, "%s ", result);
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print_function_name(file,
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entry->insns->file_entry->fields[insn_name],
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entry->expanded_bits,
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((code & generate_with_icache)
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? function_name_prefix_icache
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: function_name_prefix_semantics));
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if ((code & generate_calls))
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lf_printf(file, "(%s)", SEMANTIC_FUNCTION_ACTUAL);
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lf_printf(file, ";\n");
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}
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else if (entry->opcode_rule->gen == switch_gen
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|| entry->opcode_rule->gen == goto_switch_gen
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|| entry->opcode_rule->gen == padded_switch_gen) {
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/* switch calling switch */
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print_idecode_switch(file, entry, result);
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}
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else {
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/* switch looking up a table */
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lf_printf(file, "{\n");
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lf_indent(file, -2);
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print_idecode_table(file, entry, result);
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lf_indent(file, -2);
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lf_printf(file, "}\n");
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}
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if (entry->parent->opcode->is_boolean
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|| entry->parent->opcode_rule->gen == switch_gen
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|| entry->parent->opcode_rule->gen == padded_switch_gen) {
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lf_printf(file, "break;\n");
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}
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else if (entry->parent->opcode_rule->gen == goto_switch_gen) {
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print_goto_switch_break(file, entry);
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}
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else {
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ASSERT("bad switch" == NULL);
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}
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}
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lf_indent(file, -2);
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}
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static void
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print_idecode_switch_illegal(lf *file,
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const char *result)
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{
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lf_indent(file, +2);
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print_idecode_illegal(file, result);
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lf_printf(file, "break;\n");
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lf_indent(file, -2);
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}
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static void
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idecode_switch_end(insn_table *table,
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lf *file,
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void *data,
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int depth)
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{
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const char *result = data;
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ASSERT(depth == 0);
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ASSERT(table->opcode_rule->gen == switch_gen
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|| table->opcode_rule->gen == goto_switch_gen
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|| table->opcode_rule->gen == padded_switch_gen);
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ASSERT(table->opcode);
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if (table->opcode->is_boolean) {
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lf_printf(file, "}\n");
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}
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else if (table->opcode_rule->gen == switch_gen
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|| table->opcode_rule->gen == padded_switch_gen) {
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lf_printf(file, "default:\n");
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switch (table->opcode_rule->gen) {
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case switch_gen:
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print_idecode_switch_illegal(file, result);
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break;
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case padded_switch_gen:
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lf_printf(file, " error(\"Internal error - bad switch generated\\n\");\n");
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lf_printf(file, " break;\n");
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break;
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default:
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ASSERT("bad switch" == NULL);
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}
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lf_printf(file, "}\n");
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}
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else if (table->opcode_rule->gen == goto_switch_gen) {
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lf_printf(file, "illegal_");
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lf_print_table_name(file, table);
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lf_printf(file, ":\n");
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print_idecode_illegal(file, result);
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lf_printf(file, "break_");
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lf_print_table_name(file, table);
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lf_printf(file, ":;\n");
|
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if (table->parent != NULL
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&& (table->parent->opcode_rule->gen == switch_gen
|
|
|| table->parent->opcode_rule->gen == goto_switch_gen
|
|
|| table->parent->opcode_rule->gen == padded_switch_gen)) {
|
|
lf_indent(file, -2);
|
|
lf_printf(file, "}\n");
|
|
}
|
|
}
|
|
else {
|
|
ASSERT("bad switch" == NULL);
|
|
}
|
|
}
|
|
|
|
static void
|
|
idecode_switch_padding(insn_table *table,
|
|
lf *file,
|
|
void *data,
|
|
int depth,
|
|
int opcode_nr)
|
|
{
|
|
const char *result = data;
|
|
ASSERT(depth == 0);
|
|
ASSERT(table->opcode_rule->gen == switch_gen
|
|
|| table->opcode_rule->gen == goto_switch_gen
|
|
|| table->opcode_rule->gen == padded_switch_gen);
|
|
|
|
switch (table->opcode_rule->gen) {
|
|
case switch_gen:
|
|
break;
|
|
case padded_switch_gen:
|
|
lf_printf(file, "case %d:\n", opcode_nr);
|
|
print_idecode_switch_illegal(file, result);
|
|
break;
|
|
case goto_switch_gen:
|
|
/* no padding needed */
|
|
break;
|
|
default:
|
|
ASSERT("bad switch" != NULL);
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
print_idecode_switch(lf *file,
|
|
insn_table *table,
|
|
const char *result)
|
|
{
|
|
insn_table_traverse_tree(table,
|
|
file, (void*)result,
|
|
0,
|
|
idecode_switch_start,
|
|
idecode_switch_leaf,
|
|
idecode_switch_end,
|
|
idecode_switch_padding);
|
|
}
|
|
|
|
|
|
static void
|
|
print_idecode_switch_function_header(lf *file,
|
|
insn_table *table,
|
|
int is_function_definition)
|
|
{
|
|
lf_printf(file, "\n");
|
|
if ((code & generate_calls)) {
|
|
lf_printf(file, "static ");
|
|
if ((code & generate_with_icache))
|
|
lf_printf(file, "idecode_semantic *");
|
|
else
|
|
lf_printf(file, "unsigned_word");
|
|
if (is_function_definition)
|
|
lf_printf(file, "\n");
|
|
else
|
|
lf_printf(file, " ");
|
|
lf_print_table_name(file, table);
|
|
lf_printf(file, "\n(%s)", ICACHE_FUNCTION_FORMAL);
|
|
if (!is_function_definition)
|
|
lf_printf(file, ";");
|
|
lf_printf(file, "\n");
|
|
}
|
|
if ((code & generate_jumps) && is_function_definition) {
|
|
lf_indent(file, -1);
|
|
lf_print_table_name(file, table);
|
|
lf_printf(file, ":\n");
|
|
lf_indent(file, +1);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
idecode_declare_if_switch(insn_table *table,
|
|
lf *file,
|
|
void *data,
|
|
int depth)
|
|
{
|
|
if ((table->opcode_rule->gen == switch_gen
|
|
|| table->opcode_rule->gen == goto_switch_gen
|
|
|| table->opcode_rule->gen == padded_switch_gen)
|
|
&& table->parent != NULL /* don't declare the top one yet */
|
|
&& table->parent->opcode_rule->gen == array_gen) {
|
|
print_idecode_switch_function_header(file,
|
|
table,
|
|
0/*isnt function definition*/);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
idecode_expand_if_switch(insn_table *table,
|
|
lf *file,
|
|
void *data,
|
|
int depth)
|
|
{
|
|
if ((table->opcode_rule->gen == switch_gen
|
|
|| table->opcode_rule->gen == goto_switch_gen
|
|
|| table->opcode_rule->gen == padded_switch_gen)
|
|
&& table->parent != NULL /* don't expand the top one yet */
|
|
&& table->parent->opcode_rule->gen == array_gen) {
|
|
print_idecode_switch_function_header(file,
|
|
table,
|
|
1/*is function definition*/);
|
|
if ((code & generate_calls)) {
|
|
lf_printf(file, "{\n");
|
|
lf_indent(file, +2);
|
|
}
|
|
print_idecode_switch(file, table, "return");
|
|
if ((code & generate_calls)) {
|
|
lf_indent(file, -2);
|
|
lf_printf(file, "}\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/****************************************************************/
|
|
|
|
|
|
static void
|
|
print_idecode_lookups(lf *file,
|
|
insn_table *table,
|
|
cache_table *cache_rules)
|
|
{
|
|
int depth;
|
|
|
|
/* output switch function declarations where needed by tables */
|
|
insn_table_traverse_tree(table,
|
|
file, NULL,
|
|
1,
|
|
idecode_declare_if_switch, /* START */
|
|
NULL, NULL, NULL);
|
|
|
|
/* output tables where needed */
|
|
for (depth = insn_table_depth(table);
|
|
depth > 0;
|
|
depth--) {
|
|
insn_table_traverse_tree(table,
|
|
file, NULL,
|
|
1-depth,
|
|
print_idecode_table_start,
|
|
print_idecode_table_leaf,
|
|
print_idecode_table_end,
|
|
print_idecode_table_padding);
|
|
}
|
|
|
|
/* output switch functions where needed */
|
|
insn_table_traverse_tree(table,
|
|
file, NULL,
|
|
1,
|
|
idecode_expand_if_switch, /* START */
|
|
NULL, NULL, NULL);
|
|
}
|
|
|
|
|
|
static void
|
|
print_idecode_body(lf *file,
|
|
insn_table *table,
|
|
const char *result)
|
|
{
|
|
if (table->opcode_rule->gen == switch_gen
|
|
|| table->opcode_rule->gen == goto_switch_gen
|
|
|| table->opcode_rule->gen == padded_switch_gen)
|
|
print_idecode_switch(file, table, result);
|
|
else
|
|
print_idecode_table(file, table, result);
|
|
}
|
|
|
|
|
|
/****************************************************************/
|
|
|
|
|
|
static void
|
|
print_run_until_stop_body(lf *file,
|
|
insn_table *table,
|
|
int can_stop)
|
|
{
|
|
/* Output the function to execute real code:
|
|
|
|
Unfortunatly, there are multiple cases to consider vis:
|
|
|
|
<icache> X <smp> X <events> X <keep-running-flag> X ...
|
|
|
|
Consequently this function is written in multiple different ways */
|
|
|
|
lf_putstr(file, "{\n");
|
|
lf_indent(file, +2);
|
|
lf_putstr(file, "jmp_buf halt;\n");
|
|
lf_putstr(file, "jmp_buf restart;\n");
|
|
if (!generate_smp) {
|
|
lf_putstr(file, "cpu *processor = NULL;\n");
|
|
lf_putstr(file, "unsigned_word cia = -1;\n");
|
|
}
|
|
lf_putstr(file, "int last_cpu;\n");
|
|
if (generate_smp) {
|
|
lf_putstr(file, "int current_cpu;\n");
|
|
}
|
|
|
|
if ((code & generate_with_icache)) {
|
|
lf_putstr(file, "int cpu_nr;\n");
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* flush the icache of a possible break insn */\n");
|
|
lf_putstr(file, "for (cpu_nr = 0; cpu_nr < nr_cpus; cpu_nr++)\n");
|
|
lf_putstr(file, " cpu_flush_icache(processors[cpu_nr]);\n");
|
|
}
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* set the halt target initially */\n");
|
|
lf_putstr(file, "psim_set_halt_and_restart(system, &halt, NULL);\n");
|
|
lf_putstr(file, "if (setjmp(halt))\n");
|
|
lf_putstr(file, " return;\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* where were we before the halt? */\n");
|
|
lf_putstr(file, "last_cpu = psim_last_cpu(system);\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* check for need to force event processing first */\n");
|
|
lf_putstr(file, "if (WITH_EVENTS) {\n");
|
|
lf_putstr(file, " if (last_cpu == nr_cpus) {\n");
|
|
lf_putstr(file, " /* halted during event processing */\n");
|
|
lf_putstr(file, " event_queue_process(events);\n");
|
|
lf_putstr(file, " last_cpu = -1;\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, " else if (last_cpu == nr_cpus - 1) {\n");
|
|
lf_putstr(file, " /* last cpu did halt */\n");
|
|
lf_putstr(file, " if (event_queue_tick(events)) {\n");
|
|
lf_putstr(file, " event_queue_process(events);\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, " last_cpu = -1;\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, "}\n");
|
|
lf_putstr(file, "else {\n");
|
|
lf_putstr(file, " if (last_cpu == nr_cpus - 1)\n");
|
|
lf_putstr(file, " /* cpu zero is next */\n");
|
|
lf_putstr(file, " last_cpu = -1;\n");
|
|
lf_putstr(file, "}\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* have ensured that the event queue can not be first */\n");
|
|
lf_putstr(file, "ASSERT(last_cpu >= -1 && last_cpu < nr_cpus - 1);\n");
|
|
|
|
if (!generate_smp) {
|
|
|
|
lf_putstr(file, "
|
|
/* CASE 1: NO SMP (with or with out instruction cache).
|
|
|
|
In this case, we can take advantage of the fact that the current
|
|
instruction address does not need to be returned to the cpu object
|
|
after every execution of an instruction. Instead it only needs to
|
|
be saved when either A. the main loop exits or B. A cpu-halt or
|
|
cpu-restart call forces the loop to be re-enered. The later
|
|
functions always save the current cpu instruction address.
|
|
|
|
Two subcases also exist that with and that without an instruction
|
|
cache.
|
|
|
|
An additional complexity is the need to ensure that a 1:1 ratio
|
|
is maintained between the execution of an instruction and the
|
|
incrementing of the simulation clock */");
|
|
|
|
lf_putstr(file, "\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* now add restart target as ready to run */\n");
|
|
lf_putstr(file, "psim_set_halt_and_restart(system, &halt, &restart);\n");
|
|
lf_putstr(file, "if (setjmp(restart)) {\n");
|
|
lf_putstr(file, " if (WITH_EVENTS) {\n");
|
|
lf_putstr(file, " /* when restart, cpu must have been last, clock next */\n");
|
|
lf_putstr(file, " if (event_queue_tick(events)) {\n");
|
|
lf_putstr(file, " event_queue_process(events);\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, "}\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* prime the main loop */\n");
|
|
lf_putstr(file, "processor = processors[0];\n");
|
|
lf_putstr(file, "cia = cpu_get_program_counter(processor);\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "while (1) {\n");
|
|
lf_indent(file, +2);
|
|
|
|
if (!(code & generate_with_icache)) {
|
|
lf_putstr(file, "instruction_word instruction =\n");
|
|
lf_putstr(file, " vm_instruction_map_read(cpu_instruction_map(processor), processor, cia);\n");
|
|
lf_putstr(file, "\n");
|
|
print_idecode_body(file, table, "cia =");;
|
|
}
|
|
|
|
if ((code & generate_with_icache)) {
|
|
lf_putstr(file, "idecode_cache *cache_entry =\n");
|
|
lf_putstr(file, " cpu_icache_entry(processor, cia);\n");
|
|
lf_putstr(file, "if (cache_entry->address == cia) {\n");
|
|
lf_putstr(file, " /* cache hit */\n");
|
|
lf_putstr(file, " idecode_semantic *const semantic = cache_entry->semantic;\n");
|
|
lf_putstr(file, " cia = semantic(processor, cache_entry, cia);\n");
|
|
/* tail */
|
|
if (can_stop) {
|
|
lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
|
|
lf_putstr(file, " cpu_halt(processor, cia, was_continuing, 0/*ignore*/);\n");
|
|
}
|
|
lf_putstr(file, "}\n");
|
|
lf_putstr(file, "else {\n");
|
|
lf_putstr(file, " /* cache miss */\n");
|
|
if (!(code & generate_with_semantic_icache)) {
|
|
lf_indent(file, +2);
|
|
lf_putstr(file, "idecode_semantic *semantic;\n");
|
|
lf_indent(file, -2);
|
|
}
|
|
lf_putstr(file, " instruction_word instruction =\n");
|
|
lf_putstr(file, " vm_instruction_map_read(cpu_instruction_map(processor), processor, cia);\n");
|
|
lf_putstr(file, " if (WITH_MON != 0)\n");
|
|
lf_putstr(file, " mon_event(mon_event_icache_miss, processor, cia);\n");
|
|
if ((code & generate_with_semantic_icache)) {
|
|
lf_putstr(file, "{\n");
|
|
lf_indent(file, +2);
|
|
print_idecode_body(file, table, "cia =");
|
|
lf_indent(file, -2);
|
|
lf_putstr(file, "}\n");
|
|
}
|
|
else {
|
|
print_idecode_body(file, table, "semantic =");
|
|
lf_putstr(file, " cia = semantic(processor, cache_entry, cia);\n");
|
|
}
|
|
lf_putstr(file, "}\n");
|
|
}
|
|
|
|
/* events */
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* process any events */\n");
|
|
lf_putstr(file, "if (WITH_EVENTS) {\n");
|
|
lf_putstr(file, " if (event_queue_tick(events)) {\n");
|
|
lf_putstr(file, " cpu_set_program_counter(processor, cia);\n");
|
|
lf_putstr(file, " event_queue_process(events);\n");
|
|
lf_putstr(file, " cia = cpu_get_program_counter(processor);\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, "}\n");
|
|
|
|
/* tail */
|
|
if (can_stop) {
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* abort if necessary */\n");
|
|
lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
|
|
lf_putstr(file, " cpu_halt(processor, cia, was_continuing, 0/*not important*/);\n");
|
|
}
|
|
|
|
lf_indent(file, -2);
|
|
lf_putstr(file, "}\n");
|
|
}
|
|
|
|
if (generate_smp) {
|
|
|
|
lf_putstr(file, "
|
|
/* CASE 2: SMP (With or without ICACHE)
|
|
|
|
The complexity here comes from needing to correctly restart the
|
|
system when it is aborted. In particular if cpu0 requests a
|
|
restart, the next cpu is still cpu1. Cpu0 being restarted after
|
|
all the other CPU's and the event queue have been processed */");
|
|
|
|
lf_putstr(file, "\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* now establish the restart target */\n");
|
|
lf_putstr(file, "psim_set_halt_and_restart(system, &halt, &restart);\n");
|
|
lf_putstr(file, "if (setjmp(restart)) {\n");
|
|
lf_putstr(file, " current_cpu = psim_last_cpu(system);\n");
|
|
lf_putstr(file, " ASSERT(current_cpu >= 0 && current_cpu < nr_cpus);\n");
|
|
lf_putstr(file, "}\n");
|
|
lf_putstr(file, "else {\n");
|
|
lf_putstr(file, " current_cpu = last_cpu;\n");
|
|
lf_putstr(file, " ASSERT(current_cpu >= -1 && current_cpu < nr_cpus);\n");
|
|
lf_putstr(file, "}\n");
|
|
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "while (1) {\n");
|
|
lf_indent(file, +2);
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "if (WITH_EVENTS) {\n");
|
|
lf_putstr(file, " current_cpu += 1;\n");
|
|
lf_putstr(file, " if (current_cpu == nr_cpus) {\n");
|
|
lf_putstr(file, " if (event_queue_tick(events)) {\n");
|
|
lf_putstr(file, " event_queue_process(events);\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, " current_cpu = 0;\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, "}\n");
|
|
lf_putstr(file, "else {\n");
|
|
lf_putstr(file, " current_cpu = (current_cpu + 1) % nr_cpus;\n");
|
|
lf_putstr(file, "}\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "{\n");
|
|
lf_indent(file, +2);
|
|
lf_putstr(file, "cpu *processor = processors[current_cpu];\n");
|
|
lf_putstr(file, "unsigned_word cia =\n");
|
|
lf_putstr(file, " cpu_get_program_counter(processor);\n");
|
|
|
|
if (!(code & generate_with_icache)) {
|
|
lf_putstr(file, "instruction_word instruction =\n");
|
|
lf_putstr(file, " vm_instruction_map_read(cpu_instruction_map(processor), processor, cia);\n");
|
|
print_idecode_body(file, table, "cia =");
|
|
if (can_stop) {
|
|
lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
|
|
lf_putstr(file, " cpu_halt(processor, cia, was_continuing, 0/*ignore*/);\n");
|
|
}
|
|
lf_putstr(file, "cpu_set_program_counter(processor, cia);\n");
|
|
}
|
|
|
|
if ((code & generate_with_icache)) {
|
|
lf_putstr(file, "idecode_cache *cache_entry =\n");
|
|
lf_putstr(file, " cpu_icache_entry(processor, cia);\n");
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "if (cache_entry->address == cia) {\n");
|
|
{
|
|
lf_indent(file, +2);
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* cache hit */\n");
|
|
lf_putstr(file, "idecode_semantic *semantic = cache_entry->semantic;\n");
|
|
lf_putstr(file, "cia = semantic(processor, cache_entry, cia);\n");
|
|
/* tail */
|
|
if (can_stop) {
|
|
lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
|
|
lf_putstr(file, " cpu_halt(processor, cia, was_continuing, 0/*ignore-signal*/);\n");
|
|
}
|
|
lf_putstr(file, "cpu_set_program_counter(processor, cia);\n");
|
|
lf_putstr(file, "\n");
|
|
lf_indent(file, -2);
|
|
}
|
|
lf_putstr(file, "}\n");
|
|
lf_putstr(file, "else {\n");
|
|
{
|
|
lf_indent(file, +2);
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "/* cache miss */\n");
|
|
if (!(code & generate_with_semantic_icache)) {
|
|
lf_putstr(file, "idecode_semantic *semantic;\n");
|
|
}
|
|
lf_putstr(file, "instruction_word instruction =\n");
|
|
lf_putstr(file, " vm_instruction_map_read(cpu_instruction_map(processor), processor, cia);\n");
|
|
lf_putstr(file, "if (WITH_MON != 0)\n");
|
|
lf_putstr(file, " mon_event(mon_event_icache_miss, processors[current_cpu], cia);\n");
|
|
if ((code & generate_with_semantic_icache)) {
|
|
lf_putstr(file, "{\n");
|
|
lf_indent(file, +2);
|
|
print_idecode_body(file, table, "cia =");
|
|
lf_indent(file, -2);
|
|
lf_putstr(file, "}\n");
|
|
}
|
|
else {
|
|
print_idecode_body(file, table, "semantic = ");
|
|
lf_putstr(file, "cia = semantic(processor, cache_entry, cia);\n");
|
|
}
|
|
/* tail */
|
|
if (can_stop) {
|
|
lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
|
|
lf_putstr(file, " cpu_halt(processor, cia, was_continuing, 0/*ignore-signal*/);\n");
|
|
}
|
|
lf_putstr(file, "cpu_set_program_counter(processor, cia);\n");
|
|
lf_putstr(file, "\n");
|
|
lf_indent(file, -2);
|
|
}
|
|
lf_putstr(file, "}\n");
|
|
}
|
|
|
|
/* close */
|
|
lf_indent(file, -2);
|
|
lf_putstr(file, "}\n");
|
|
|
|
/* tail */
|
|
lf_indent(file, -2);
|
|
lf_putstr(file, "}\n");
|
|
}
|
|
|
|
|
|
lf_indent(file, -2);
|
|
lf_putstr(file, "}\n");
|
|
}
|
|
|
|
|
|
/****************************************************************/
|
|
|
|
static void
|
|
print_jump(lf *file,
|
|
int is_tail)
|
|
{
|
|
if (is_tail) {
|
|
lf_putstr(file, "if (keep_running != NULL && !*keep_running)\n");
|
|
lf_putstr(file, " cpu_halt(processor, nia, was_continuing, 0/*na*/);\n");
|
|
}
|
|
|
|
if (!generate_smp) {
|
|
lf_putstr(file, "if (WITH_EVENTS) {\n");
|
|
lf_putstr(file, " if (event_queue_tick(events)) {\n");
|
|
lf_putstr(file, " cpu_set_program_counter(processor, nia);\n");
|
|
lf_putstr(file, " event_queue_process(events);\n");
|
|
lf_putstr(file, " nia = cpu_get_program_counter(processor);\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, "}\n");
|
|
}
|
|
|
|
if (generate_smp) {
|
|
if (is_tail)
|
|
lf_putstr(file, "cpu_set_program_counter(processor, nia);\n");
|
|
lf_putstr(file, "if (WITH_EVENTS) {\n");
|
|
lf_putstr(file, " current_cpu += 1;\n");
|
|
lf_putstr(file, " if (current_cpu >= nr_cpus) {\n");
|
|
lf_putstr(file, " if (event_queue_tick(events)) {\n");
|
|
lf_putstr(file, " event_queue_process(events);\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, " current_cpu = 0;\n");
|
|
lf_putstr(file, " }\n");
|
|
lf_putstr(file, "}\n");
|
|
lf_putstr(file, "else {\n");
|
|
lf_putstr(file, " current_cpu = (current_cpu + 1) % nr_cpus;\n");
|
|
lf_putstr(file, "}\n");
|
|
lf_putstr(file, "processor = processors[current_cpu];\n");
|
|
lf_putstr(file, "nia = cpu_get_program_counter(processor);\n");
|
|
}
|
|
|
|
if ((code & generate_with_icache)) {
|
|
lf_putstr(file, "cache_entry = cpu_icache_entry(processor, nia);\n");
|
|
lf_putstr(file, "if (cache_entry->address == nia) {\n");
|
|
lf_putstr(file, " /* cache hit */\n");
|
|
lf_putstr(file, " goto *cache_entry->semantic;\n");
|
|
lf_putstr(file, "}\n");
|
|
if (is_tail) {
|
|
lf_putstr(file, "goto cache_miss;\n");
|
|
}
|
|
}
|
|
|
|
if (!(code & generate_with_icache) && is_tail) {
|
|
lf_printf(file, "goto idecode;\n");
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
|
print_jump_insn(lf *file,
|
|
insn *instruction,
|
|
insn_bits *expanded_bits,
|
|
opcode_field *opcodes,
|
|
cache_table *cache_rules)
|
|
{
|
|
|
|
/* what we are for the moment */
|
|
lf_printf(file, "\n");
|
|
print_my_defines(file, expanded_bits, instruction->file_entry);
|
|
|
|
/* output the icache entry */
|
|
if ((code & generate_with_icache)) {
|
|
lf_printf(file, "\n");
|
|
lf_indent(file, -1);
|
|
print_function_name(file,
|
|
instruction->file_entry->fields[insn_name],
|
|
expanded_bits,
|
|
function_name_prefix_icache);
|
|
lf_printf(file, ":\n");
|
|
lf_indent(file, +1);
|
|
lf_printf(file, "{\n");
|
|
lf_indent(file, +2);
|
|
lf_putstr(file, "const unsigned_word cia = nia;\n");
|
|
print_itrace(file, instruction->file_entry, 1/*putting-value-in-cache*/);
|
|
print_idecode_validate(file, instruction, opcodes);
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "{\n");
|
|
lf_indent(file, +2);
|
|
print_icache_body(file,
|
|
instruction,
|
|
expanded_bits,
|
|
cache_rules,
|
|
0, /*use_defines*/
|
|
put_values_in_icache);
|
|
lf_printf(file, "cache_entry->address = nia;\n");
|
|
lf_printf(file, "cache_entry->semantic = &&");
|
|
print_function_name(file,
|
|
instruction->file_entry->fields[insn_name],
|
|
expanded_bits,
|
|
function_name_prefix_semantics);
|
|
lf_printf(file, ";\n");
|
|
if ((code & generate_with_semantic_icache)) {
|
|
print_semantic_body(file,
|
|
instruction,
|
|
expanded_bits,
|
|
opcodes);
|
|
print_jump(file, 1/*is-tail*/);
|
|
}
|
|
else {
|
|
lf_printf(file, "/* goto ");
|
|
print_function_name(file,
|
|
instruction->file_entry->fields[insn_name],
|
|
expanded_bits,
|
|
function_name_prefix_semantics);
|
|
lf_printf(file, "; */\n");
|
|
}
|
|
lf_indent(file, -2);
|
|
lf_putstr(file, "}\n");
|
|
lf_indent(file, -2);
|
|
lf_printf(file, "}\n");
|
|
}
|
|
|
|
/* print the semantics */
|
|
lf_printf(file, "\n");
|
|
lf_indent(file, -1);
|
|
print_function_name(file,
|
|
instruction->file_entry->fields[insn_name],
|
|
expanded_bits,
|
|
function_name_prefix_semantics);
|
|
lf_printf(file, ":\n");
|
|
lf_indent(file, +1);
|
|
lf_printf(file, "{\n");
|
|
lf_indent(file, +2);
|
|
lf_putstr(file, "const unsigned_word cia = nia;\n");
|
|
print_icache_body(file,
|
|
instruction,
|
|
expanded_bits,
|
|
cache_rules,
|
|
((code & generate_with_direct_access)
|
|
? define_variables
|
|
: declare_variables),
|
|
((code & generate_with_icache)
|
|
? get_values_from_icache
|
|
: do_not_use_icache));
|
|
print_semantic_body(file,
|
|
instruction,
|
|
expanded_bits,
|
|
opcodes);
|
|
if (code & generate_with_direct_access)
|
|
print_icache_body(file,
|
|
instruction,
|
|
expanded_bits,
|
|
cache_rules,
|
|
undef_variables,
|
|
((code & generate_with_icache)
|
|
? get_values_from_icache
|
|
: do_not_use_icache));
|
|
print_jump(file, 1/*is tail*/);
|
|
lf_indent(file, -2);
|
|
lf_printf(file, "}\n");
|
|
}
|
|
|
|
static void
|
|
print_jump_definition(insn_table *entry,
|
|
lf *file,
|
|
void *data,
|
|
insn *instruction,
|
|
int depth)
|
|
{
|
|
cache_table *cache_rules = (cache_table*)data;
|
|
if (generate_expanded_instructions) {
|
|
ASSERT(entry->nr_insn == 1
|
|
&& entry->opcode == NULL
|
|
&& entry->parent != NULL
|
|
&& entry->parent->opcode != NULL);
|
|
ASSERT(entry->nr_insn == 1
|
|
&& entry->opcode == NULL
|
|
&& entry->parent != NULL
|
|
&& entry->parent->opcode != NULL
|
|
&& entry->parent->opcode_rule != NULL);
|
|
print_jump_insn(file,
|
|
entry->insns,
|
|
entry->expanded_bits,
|
|
entry->opcode,
|
|
cache_rules);
|
|
}
|
|
else {
|
|
print_jump_insn(file,
|
|
instruction,
|
|
NULL,
|
|
NULL,
|
|
cache_rules);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
print_jump_internal_function(insn_table *table,
|
|
lf *file,
|
|
void *data,
|
|
table_entry *function)
|
|
{
|
|
if (it_is("internal", function->fields[insn_flags])) {
|
|
lf_printf(file, "\n");
|
|
table_entry_print_cpp_line_nr(file, function);
|
|
lf_indent(file, -1);
|
|
print_function_name(file,
|
|
function->fields[insn_name],
|
|
NULL,
|
|
((code & generate_with_icache)
|
|
? function_name_prefix_icache
|
|
: function_name_prefix_semantics));
|
|
lf_printf(file, ":\n");
|
|
lf_indent(file, +1);
|
|
lf_printf(file, "{\n");
|
|
lf_indent(file, +2);
|
|
lf_printf(file, "const unsigned_word cia = nia;\n");
|
|
lf_print__c_code(file, function->annex);
|
|
lf_print__internal_reference(file);
|
|
lf_printf(file, "error(\"Internal function must longjump\\n\");\n");
|
|
lf_indent(file, -2);
|
|
lf_printf(file, "}\n");
|
|
}
|
|
}
|
|
|
|
static void
|
|
print_jump_until_stop_body(lf *file,
|
|
insn_table *table,
|
|
cache_table *cache_rules,
|
|
int can_stop)
|
|
{
|
|
lf_printf(file, "{\n");
|
|
lf_indent(file, +2);
|
|
if (!can_stop)
|
|
lf_printf(file, "int *keep_running = NULL;\n");
|
|
lf_putstr(file, "jmp_buf halt;\n");
|
|
lf_putstr(file, "jmp_buf restart;\n");
|
|
lf_putstr(file, "cpu *processor = NULL;\n");
|
|
lf_putstr(file, "unsigned_word nia = -1;\n");
|
|
lf_putstr(file, "instruction_word instruction = 0;\n");
|
|
if ((code & generate_with_icache)) {
|
|
lf_putstr(file, "idecode_cache *cache_entry = NULL;\n");
|
|
}
|
|
if (generate_smp) {
|
|
lf_putstr(file, "int current_cpu = -1;\n");
|
|
}
|
|
|
|
/* all the switches and tables - they know about jumping */
|
|
print_idecode_lookups(file, table, cache_rules);
|
|
|
|
/* start the simulation up */
|
|
if ((code & generate_with_icache)) {
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "{\n");
|
|
lf_putstr(file, " int cpu_nr;\n");
|
|
lf_putstr(file, " for (cpu_nr = 0; cpu_nr < nr_cpus; cpu_nr++)\n");
|
|
lf_putstr(file, " cpu_flush_icache(processors[cpu_nr]);\n");
|
|
lf_putstr(file, "}\n");
|
|
}
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "psim_set_halt_and_restart(system, &halt, &restart);\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "if (setjmp(halt))\n");
|
|
lf_putstr(file, " return;\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
lf_putstr(file, "setjmp(restart);\n");
|
|
|
|
lf_putstr(file, "\n");
|
|
if (!generate_smp) {
|
|
lf_putstr(file, "processor = processors[0];\n");
|
|
lf_putstr(file, "nia = cpu_get_program_counter(processor);\n");
|
|
}
|
|
else {
|
|
lf_putstr(file, "current_cpu = psim_last_cpu(system);\n");
|
|
}
|
|
|
|
if (!(code & generate_with_icache)) {
|
|
lf_printf(file, "\n");
|
|
lf_indent(file, -1);
|
|
lf_printf(file, "idecode:\n");
|
|
lf_indent(file, +1);
|
|
}
|
|
|
|
print_jump(file, 0/*is_tail*/);
|
|
|
|
if ((code & generate_with_icache)) {
|
|
lf_indent(file, -1);
|
|
lf_printf(file, "cache_miss:\n");
|
|
lf_indent(file, +1);
|
|
}
|
|
|
|
lf_putstr(file, "instruction\n");
|
|
lf_putstr(file, " = vm_instruction_map_read(cpu_instruction_map(processor),\n");
|
|
lf_putstr(file, " processor, nia);\n");
|
|
print_idecode_body(file, table, "/*IGORE*/");
|
|
|
|
/* print out a table of all the internals functions */
|
|
insn_table_traverse_function(table,
|
|
file, NULL,
|
|
print_jump_internal_function);
|
|
|
|
/* print out a table of all the instructions */
|
|
if (generate_expanded_instructions)
|
|
insn_table_traverse_tree(table,
|
|
file, cache_rules,
|
|
1,
|
|
NULL, /* start */
|
|
print_jump_definition, /* leaf */
|
|
NULL, /* end */
|
|
NULL); /* padding */
|
|
else
|
|
insn_table_traverse_insn(table,
|
|
file, cache_rules,
|
|
print_jump_definition);
|
|
lf_indent(file, -2);
|
|
lf_printf(file, "}\n");
|
|
}
|
|
|
|
|
|
/****************************************************************/
|
|
|
|
|
|
|
|
static void
|
|
print_idecode_floating_point_unavailable(lf *file)
|
|
{
|
|
if ((code & generate_jumps))
|
|
lf_printf(file, "goto %s_floating_point_unavailable;\n", (code & generate_with_icache) ? "icache" : "semantic");
|
|
else if ((code & generate_with_icache))
|
|
lf_printf(file, "return icache_floating_point_unavailable(%s);\n",
|
|
ICACHE_FUNCTION_ACTUAL);
|
|
else
|
|
lf_printf(file, "return semantic_floating_point_unavailable(%s);\n",
|
|
SEMANTIC_FUNCTION_ACTUAL);
|
|
}
|
|
|
|
|
|
/* Output code to do any final checks on the decoded instruction.
|
|
This includes things like verifying any on decoded fields have the
|
|
correct value and checking that (for floating point) floating point
|
|
hardware isn't disabled */
|
|
|
|
void
|
|
print_idecode_validate(lf *file,
|
|
insn *instruction,
|
|
opcode_field *opcodes)
|
|
{
|
|
/* Validate: unchecked instruction fields
|
|
|
|
If any constant fields in the instruction were not checked by the
|
|
idecode tables, output code to check that they have the correct
|
|
value here */
|
|
{
|
|
unsigned check_mask = 0;
|
|
unsigned check_val = 0;
|
|
insn_field *field;
|
|
opcode_field *opcode;
|
|
|
|
/* form check_mask/check_val containing what needs to be checked
|
|
in the instruction */
|
|
for (field = instruction->fields->first;
|
|
field->first < insn_bit_size;
|
|
field = field->next) {
|
|
|
|
check_mask <<= field->width;
|
|
check_val <<= field->width;
|
|
|
|
/* is it a constant that could need validating? */
|
|
if (!field->is_int && !field->is_slash)
|
|
continue;
|
|
|
|
/* has it been checked by a table? */
|
|
for (opcode = opcodes; opcode != NULL; opcode = opcode->parent) {
|
|
if (field->first >= opcode->first
|
|
&& field->last <= opcode->last)
|
|
break;
|
|
}
|
|
if (opcode != NULL)
|
|
continue;
|
|
|
|
check_mask |= (1 << field->width)-1;
|
|
check_val |= field->val_int;
|
|
}
|
|
|
|
/* if any bits not checked by opcode tables, output code to check them */
|
|
if (check_mask) {
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "/* validate: %s */\n",
|
|
instruction->file_entry->fields[insn_format]);
|
|
lf_printf(file, "if (WITH_RESERVED_BITS && (instruction & 0x%x) != 0x%x)\n",
|
|
check_mask, check_val);
|
|
lf_indent(file, +2);
|
|
print_idecode_illegal(file, "return");
|
|
lf_indent(file, -2);
|
|
}
|
|
}
|
|
|
|
/* Validate floating point hardware
|
|
|
|
If the simulator is being built with out floating point hardware
|
|
(different to it being disabled in the MSR) then floating point
|
|
instructions are invalid */
|
|
{
|
|
if (it_is("f", instruction->file_entry->fields[insn_flags])) {
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "/* Validate: FP hardware exists */\n");
|
|
lf_printf(file, "if (CURRENT_FLOATING_POINT != HARD_FLOATING_POINT)\n");
|
|
lf_indent(file, +2);
|
|
print_idecode_illegal(file, "return");
|
|
lf_indent(file, -2);
|
|
}
|
|
}
|
|
|
|
/* Validate: Floating Point available
|
|
|
|
If floating point is not available, we enter a floating point
|
|
unavailable interrupt into the cache instead of the instruction
|
|
proper.
|
|
|
|
The PowerPC spec requires a CSI after MSR[FP] is changed and when
|
|
ever a CSI occures we flush the instruction cache. */
|
|
|
|
{
|
|
if (it_is("f", instruction->file_entry->fields[insn_flags])) {
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "/* Validate: FP available according to MSR[FP] */\n");
|
|
lf_printf(file, "if (!IS_FP_AVAILABLE(processor))\n");
|
|
lf_indent(file, +2);
|
|
print_idecode_floating_point_unavailable(file);
|
|
lf_indent(file, -2);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/****************************************************************/
|
|
|
|
|
|
static void
|
|
print_idecode_run_function_header(lf *file,
|
|
int can_stop,
|
|
int is_definition)
|
|
{
|
|
int indent;
|
|
lf_printf(file, "\n");
|
|
lf_print_function_type(file, "void", "INLINE_IDECODE", (is_definition ? " " : "\n"));
|
|
indent = lf_putstr(file, (can_stop ? "idecode_run_until_stop" : "idecode_run"));
|
|
if (is_definition)
|
|
lf_putstr(file, "\n");
|
|
else
|
|
lf_indent(file, +indent);
|
|
lf_putstr(file, "(psim *system,\n");
|
|
if (can_stop)
|
|
lf_putstr(file, " volatile int *keep_running,\n");
|
|
lf_printf(file, " event_queue *events,\n");
|
|
lf_putstr(file, " cpu *const processors[],\n");
|
|
lf_putstr(file, " const int nr_cpus)");
|
|
if (is_definition)
|
|
lf_putstr(file, ";");
|
|
else
|
|
lf_indent(file, -indent);
|
|
lf_putstr(file, "\n");
|
|
}
|
|
|
|
|
|
void
|
|
gen_idecode_h(lf *file,
|
|
insn_table *table,
|
|
cache_table *cache_rules)
|
|
{
|
|
lf_printf(file, "/* The idecode_*.h functions shall move to support */\n");
|
|
lf_printf(file, "#include \"idecode_expression.h\"\n");
|
|
lf_printf(file, "#include \"idecode_fields.h\"\n");
|
|
lf_printf(file, "#include \"idecode_branch.h\"\n");
|
|
lf_printf(file, "\n");
|
|
print_icache_struct(table, cache_rules, file);
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "#define WITH_IDECODE_SMP %d\n", generate_smp);
|
|
lf_printf(file, "\n");
|
|
print_idecode_run_function_header(file, 0/*can stop*/, 1/*is definition*/);
|
|
print_idecode_run_function_header(file, 1/*can stop*/, 1/*is definition*/);
|
|
}
|
|
|
|
|
|
void
|
|
gen_idecode_c(lf *file,
|
|
insn_table *table,
|
|
cache_table *cache_rules)
|
|
{
|
|
/* the intro */
|
|
lf_printf(file, "#include \"inline.c\"\n");
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "#include \"cpu.h\"\n");
|
|
lf_printf(file, "#include \"idecode.h\"\n");
|
|
lf_printf(file, "#include \"semantics.h\"\n");
|
|
lf_printf(file, "#include \"icache.h\"\n");
|
|
lf_printf(file, "#include \"support.h\"\n");
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "#include <setjmp.h>\n");
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "enum {\n");
|
|
lf_printf(file, " /* greater or equal to zero => table */\n");
|
|
lf_printf(file, " function_entry = -1,\n");
|
|
lf_printf(file, " boolean_entry = -2,\n");
|
|
lf_printf(file, "};\n");
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "typedef struct _idecode_table_entry {\n");
|
|
lf_printf(file, " int shift;\n");
|
|
lf_printf(file, " instruction_word mask;\n");
|
|
lf_printf(file, " instruction_word value;");
|
|
lf_printf(file, " void *function_or_table;\n");
|
|
lf_printf(file, "} idecode_table_entry;\n");
|
|
lf_printf(file, "\n");
|
|
lf_printf(file, "\n");
|
|
|
|
if ((code & generate_calls)) {
|
|
|
|
print_idecode_lookups(file, table, cache_rules);
|
|
|
|
/* output the main idecode routine */
|
|
print_idecode_run_function_header(file, 0/*can stop*/, 0/*is definition*/);
|
|
print_run_until_stop_body(file, table, 0/* have stop argument */);
|
|
|
|
print_idecode_run_function_header(file, 1/*can stop*/, 0/*is definition*/);
|
|
print_run_until_stop_body(file, table, 1/* no stop argument */);
|
|
|
|
}
|
|
else if ((code & generate_jumps)) {
|
|
|
|
print_idecode_run_function_header(file, 0/*can stop*/, 0/*is definition*/);
|
|
print_jump_until_stop_body(file, table, cache_rules, 0 /* have stop argument */);
|
|
|
|
print_idecode_run_function_header(file, 1/*can stop*/, 0/*is definition*/);
|
|
print_jump_until_stop_body(file, table, cache_rules, 1/* have stop argument */);
|
|
|
|
}
|
|
else {
|
|
error("Something is wrong!\n");
|
|
}
|
|
}
|