| 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 3 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, see <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | */ |
| 19 | |
| 20 | /* Instruction unpacking: |
| 21 | |
| 22 | Once the instruction has been decoded, the register (and other) |
| 23 | fields within the instruction need to be extracted. |
| 24 | |
| 25 | The table that follows determines how each field should be treated. |
| 26 | Importantly it considers the case where the extracted field is to |
| 27 | be used immediately or stored in an instruction cache. |
| 28 | |
| 29 | <type> |
| 30 | |
| 31 | Indicates what to do with the cache entry. If a cache is to be |
| 32 | used. SCRATCH and CACHE values are defined when a cache entry is |
| 33 | being filled while CACHE and COMPUTE values are defined in the |
| 34 | semantic code. |
| 35 | |
| 36 | Zero marks the end of the table. More importantly 1. indicates |
| 37 | that the entry is valid and can be cached. 2. indicates that that |
| 38 | the entry is valid but can not be cached. |
| 39 | |
| 40 | <field_name> |
| 41 | |
| 42 | The field name as given in the instruction spec. |
| 43 | |
| 44 | <derived_name> |
| 45 | |
| 46 | A new name for <field_name> once it has been extracted from the |
| 47 | instruction (and possibly stored in the instruction cache). |
| 48 | |
| 49 | <type> |
| 50 | |
| 51 | String specifying the storage type for <new_name> (the extracted |
| 52 | field>. |
| 53 | |
| 54 | <expression> |
| 55 | |
| 56 | Specifies how to get <new_name> from <old_name>. If null, old and |
| 57 | new name had better be the same. */ |
| 58 | |
| 59 | |
| 60 | typedef enum { |
| 61 | scratch_value, |
| 62 | cache_value, |
| 63 | compute_value, |
| 64 | } cache_rule_type; |
| 65 | |
| 66 | typedef struct _cache_table cache_table; |
| 67 | struct _cache_table { |
| 68 | cache_rule_type type; |
| 69 | char *field_name; |
| 70 | char *derived_name; |
| 71 | char *type_def; |
| 72 | char *expression; |
| 73 | table_entry *file_entry; |
| 74 | cache_table *next; |
| 75 | }; |
| 76 | |
| 77 | |
| 78 | extern cache_table *load_cache_table |
| 79 | (char *file_name, |
| 80 | int hi_bit_nr); |
| 81 | |
| 82 | extern void append_cache_rule |
| 83 | (cache_table **table, |
| 84 | char *type, |
| 85 | char *field_name, |
| 86 | char *derived_name, |
| 87 | char *type_def, |
| 88 | char *expression, |
| 89 | table_entry *file_entry); |
| 90 | |