1/* This file is part of the program psim. 2 3 Copyright 1994, 1995, 1996, 1997, 2003, Andrew Cagney 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 2 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 19 */ 20 21/* Instruction unpacking: 22 23 Once the instruction has been decoded, the register (and other) 24 fields within the instruction need to be extracted. 25 26 The table that follows determines how each field should be treated. 27 Importantly it considers the case where the extracted field is to 28 be used immediatly or stored in an instruction cache. 29 30 <type> 31 32 Indicates what to do with the cache entry. If a cache is to be 33 used. SCRATCH and CACHE values are defined when a cache entry is 34 being filled while CACHE and COMPUTE values are defined in the 35 semantic code. 36 37 Zero marks the end of the table. More importantly 1. indicates 38 that the entry is valid and can be cached. 2. indicates that that 39 the entry is valid but can not be cached. 40 41 <field_name> 42 43 The field name as given in the instruction spec. 44 45 <derived_name> 46 47 A new name for <field_name> once it has been extracted from the 48 instruction (and possibly stored in the instruction cache). 49 50 <type> 51 52 String specifying the storage type for <new_name> (the extracted 53 field>. 54 55 <expression> 56 57 Specifies how to get <new_name> from <old_name>. If null, old and 58 new name had better be the same. */ 59 60 61typedef enum { 62 scratch_value, 63 cache_value, 64 compute_value, 65} cache_rule_type; 66 67typedef struct _cache_table cache_table; 68struct _cache_table { 69 cache_rule_type type; 70 char *field_name; 71 char *derived_name; 72 char *type_def; 73 char *expression; 74 table_entry *file_entry; 75 cache_table *next; 76}; 77 78 79extern cache_table *load_cache_table 80(char *file_name, 81 int hi_bit_nr); 82 83extern void append_cache_rule 84(cache_table **table, 85 char *type, 86 char *field_name, 87 char *derived_name, 88 char *type_def, 89 char *expression, 90 table_entry *file_entry); 91 92