Instruction decode generator taken from the PowerPC simulator

and being made more generic.

1 files changed, 115 insertions, 0 deletions

diff --git a/sim/igen/ld-cache.c b/sim/igen/ld-cache.c
new file mode 100644
index 0000000..e7f119e
--- /dev/null
+++ b/sim/igen/ld-cache.c
@@ -0,0 +1,115 @@
+/*  This file is part of the program psim.
+
+    Copyright (C) 1994,1995,1996, Andrew Cagney <cagney@highland.com.au>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ 
+    */
+
+
+#include "misc.h"
+#include "lf.h"
+#include "table.h"
+#include "ld-cache.h"
+
+#ifndef NULL
+#define NULL 0
+#endif
+
+
+enum {
+  ca_type,
+  ca_field_name,
+  ca_derived_name,
+  ca_type_def,
+  ca_expression,
+  nr_cache_rule_fields,
+};
+
+static const name_map cache_type_map[] = {
+  { "cache", cache_value },
+  { "compute", compute_value },
+  { "scratch", scratch_value },
+  { NULL, 0 },
+};
+
+
+cache_table *
+load_cache_table(char *file_name,
+		 int hi_bit_nr)
+{
+  table *file = table_open(file_name, nr_cache_rule_fields, 0);
+  table_entry *entry;
+  cache_table *table = NULL;
+  cache_table **curr_rule = &table;
+  while ((entry = table_entry_read(file)) != NULL) {
+    cache_table *new_rule = ZALLOC(cache_table);
+    new_rule->type = name2i(entry->fields[ca_type], cache_type_map);
+    new_rule->field_name = entry->fields[ca_field_name];
+    new_rule->derived_name = entry->fields[ca_derived_name];
+    new_rule->type_def = (strlen(entry->fields[ca_type_def])
+			  ? entry->fields[ca_type_def]
+			  : NULL);
+    new_rule->expression = (strlen(entry->fields[ca_expression]) > 0
+			    ? entry->fields[ca_expression]
+			    : NULL);
+    new_rule->file_entry = entry;
+    *curr_rule = new_rule;
+    curr_rule = &new_rule->next;
+  }
+  return table;
+}
+
+
+
+#ifdef MAIN
+
+static void
+dump_cache_rule(cache_table* rule,
+		int indent)
+{
+  dumpf(indent, "((cache_table*)0x%x\n", rule);
+  dumpf(indent, " (type %s)\n", i2name(rule->type, cache_type_map));
+  dumpf(indent, " (field_name \"%s\")\n", rule->field_name);
+  dumpf(indent, " (derived_name \"%s\")\n", rule->derived_name);
+  dumpf(indent, " (type-def \"%s\")\n", rule->type_def);
+  dumpf(indent, " (expression \"%s\")\n", rule->expression);
+  dumpf(indent, " (next 0x%x)\n", rule->next);
+  dumpf(indent, " )\n");
+}
+
+
+static void
+dump_cache_rules(cache_table* rule,
+		 int indent)
+{
+  while (rule) {
+    dump_cache_rule(rule, indent);
+    rule = rule->next;
+  }
+}
+
+
+int
+main(int argc, char **argv)
+{
+  cache_table *rules;
+  if (argc != 3)
+    error("Usage: cache <cache-file> <hi-bit-nr>\n");
+  rules = load_cache_table(argv[1], a2i(argv[2]));
+  dump_cache_rules(rules, 0);
+  return 0;
+}
+#endif