82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/* 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.
|
|
|
|
*/
|
|
|
|
/* Instruction unpacking:
|
|
|
|
Once the instruction has been decoded, the register (and other)
|
|
fields within the instruction need to be extracted.
|
|
|
|
The table that follows determines how each field should be treated.
|
|
Importantly it considers the case where the extracted field is to
|
|
be used immediatly or stored in an instruction cache.
|
|
|
|
<type>
|
|
|
|
Indicates what to do with the cache entry. If a cache is to be
|
|
used. SCRATCH and CACHE values are defined when a cache entry is
|
|
being filled while CACHE and COMPUTE values are defined in the
|
|
semantic code.
|
|
|
|
Zero marks the end of the table. More importantly 1. indicates
|
|
that the entry is valid and can be cached. 2. indicates that that
|
|
the entry is valid but can not be cached.
|
|
|
|
<field_name>
|
|
|
|
The field name as given in the instruction spec.
|
|
|
|
<derived_name>
|
|
|
|
A new name for <field_name> once it has been extracted from the
|
|
instruction (and possibly stored in the instruction cache).
|
|
|
|
<type>
|
|
|
|
String specifying the storage type for <new_name> (the extracted
|
|
field>.
|
|
|
|
<expression>
|
|
|
|
Specifies how to get <new_name> from <old_name>. If null, old and
|
|
new name had better be the same. */
|
|
|
|
|
|
typedef enum {
|
|
scratch_value,
|
|
cache_value,
|
|
compute_value,
|
|
} cache_rule_type;
|
|
|
|
typedef struct _cache_table cache_table;
|
|
struct _cache_table {
|
|
cache_rule_type type;
|
|
char *field_name;
|
|
char *derived_name;
|
|
char *type_def;
|
|
char *expression;
|
|
table_entry *file_entry;
|
|
cache_table *next;
|
|
};
|
|
|
|
|
|
extern cache_table *load_cache_table
|
|
(char *file_name,
|
|
int hi_bit_nr);
|