1/*  This file is part of the program psim.
2
3    Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
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
22/* Creates the files semantics.[hc].
23
24   The generated file semantics contains functions that implement the
25   operations required to model a single target processor instruction.
26
27   Several different variations on the semantics file can be created:
28
29	o	uncached
30
31        	No instruction cache exists.  The semantic function
32		needs to generate any required values locally.
33
34	o	cached - separate cracker and semantic
35
36		Two independant functions are created.  Firstly the
37		function that cracks an instruction entering it into a
38		cache and secondly the semantic function propper that
39		uses the cache.
40
41	o	cached - semantic + cracking semantic
42
43		The function that cracks the instruction and enters
44		all values into the cache also contains a copy of the
45		semantic code (avoiding the need to call both the
46		cracker and the semantic function when there is a
47		cache miss).
48
49   For each of these general forms, several refinements can occure:
50
51	o	do/don't duplicate/expand semantic functions
52
53		As a consequence of decoding an instruction, the
54		decoder, as part of its table may have effectivly made
55		certain of the variable fields in an instruction
56		constant. Separate functions for each of the
57		alternative values for what would have been treated as
58		a variable part can be created.
59
60	o	use cache struct directly.
61
62		When a cracking cache is present, the semantic
63		functions can be generated to either hold intermediate
64		cache values in local variables or always refer to the
65		contents of the cache directly. */
66
67
68
69extern insn_handler print_semantic_declaration;
70extern insn_handler print_semantic_definition;
71
72extern void print_idecode_illegal
73(lf *file,
74 const char *result);
75
76extern void print_semantic_body
77(lf *file,
78 insn *instruction,
79 insn_bits *expanded_bits,
80 opcode_field *opcodes);
81
82