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