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feaee4bd AC |
1 | /* The IGEN simulator generator for GDB, the GNU Debugger. |
2 | ||
3 | Copyright 2002 Free Software Foundation, Inc. | |
4 | ||
5 | Contributed by Andrew Cagney. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
23 | |
24 | ||
25 | /* Creates the files semantics.[hc]. | |
26 | ||
27 | The generated file semantics contains functions that implement the | |
28 | operations required to model a single target processor instruction. | |
29 | ||
30 | Several different variations on the semantics file can be created: | |
31 | ||
32 | o uncached | |
33 | ||
34 | No instruction cache exists. The semantic function | |
35 | needs to generate any required values locally. | |
36 | ||
37 | o cached - separate cracker and semantic | |
38 | ||
39 | Two independant functions are created. Firstly the | |
40 | function that cracks an instruction entering it into a | |
41 | cache and secondly the semantic function propper that | |
42 | uses the cache. | |
43 | ||
44 | o cached - semantic + cracking semantic | |
45 | ||
46 | The function that cracks the instruction and enters | |
47 | all values into the cache also contains a copy of the | |
48 | semantic code (avoiding the need to call both the | |
49 | cracker and the semantic function when there is a | |
50 | cache miss). | |
51 | ||
52 | For each of these general forms, several refinements can occure: | |
53 | ||
54 | o do/don't duplicate/expand semantic functions | |
55 | ||
56 | As a consequence of decoding an instruction, the | |
57 | decoder, as part of its table may have effectivly made | |
58 | certain of the variable fields in an instruction | |
59 | constant. Separate functions for each of the | |
60 | alternative values for what would have been treated as | |
61 | a variable part can be created. | |
62 | ||
63 | o use cache struct directly. | |
64 | ||
65 | When a cracking cache is present, the semantic | |
66 | functions can be generated to either hold intermediate | |
67 | cache values in local variables or always refer to the | |
68 | contents of the cache directly. */ | |
69 | ||
70 | ||
71 | ||
72 | ||
73 | ||
74 | ||
75 | extern void print_semantic_declaration | |
4e0bf4c4 AC |
76 | (lf *file, |
77 | insn_entry * insn, | |
78 | opcode_bits *bits, insn_opcodes *opcodes, int nr_prefetched_words); | |
c906108c SS |
79 | |
80 | extern void print_semantic_definition | |
4e0bf4c4 AC |
81 | (lf *file, |
82 | insn_entry * insn, | |
83 | opcode_bits *bits, | |
84 | insn_opcodes *opcodes, cache_entry *cache_rules, int nr_prefetched_words); | |
c906108c SS |
85 | |
86 | ||
4e0bf4c4 AC |
87 | typedef enum |
88 | { | |
c906108c SS |
89 | invalid_illegal, |
90 | invalid_fp_unavailable, | |
91 | invalid_wrong_slot, | |
4e0bf4c4 AC |
92 | } |
93 | invalid_type; | |
c906108c SS |
94 | |
95 | extern void print_idecode_invalid | |
4e0bf4c4 | 96 | (lf *file, const char *result, invalid_type type); |
c906108c SS |
97 | |
98 | extern void print_semantic_body | |
4e0bf4c4 AC |
99 | (lf *file, |
100 | insn_entry * instruction, | |
101 | opcode_bits *expanded_bits, insn_opcodes *opcodes); |