1 /* This file is part of the program psim.
2
3 Copyright (C) 1994-1997, 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 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
21
22 #include "misc.h"
23 #include "lf.h"
24 #include "table.h"
25 #include "filter.h"
26
27 #include "ld-decode.h"
28 #include "ld-cache.h"
29 #include "ld-insn.h"
30
31 #include "igen.h"
32
33 #include "gen-semantics.h"
34 #include "gen-icache.h"
35 #include "gen-idecode.h"
36
37
38 static void
print_semantic_function_header(lf * file,const char * basename,insn_bits * expanded_bits,int is_function_definition)39 print_semantic_function_header(lf *file,
40 const char *basename,
41 insn_bits *expanded_bits,
42 int is_function_definition)
43 {
44 int indent;
45 lf_printf(file, "\n");
46 lf_print_function_type(file, SEMANTIC_FUNCTION_TYPE, "PSIM_EXTERN_SEMANTICS",
47 (is_function_definition ? "\n" : " "));
48 indent = print_function_name(file,
49 basename,
50 expanded_bits,
51 function_name_prefix_semantics);
52 if (is_function_definition)
53 lf_indent(file, +indent);
54 else
55 lf_printf(file, "\n");
56 lf_printf(file, "(%s)", SEMANTIC_FUNCTION_FORMAL);
57 if (is_function_definition)
58 lf_indent(file, -indent);
59 else
60 lf_printf(file, ";");
61 lf_printf(file, "\n");
62 }
63
64 void
print_semantic_declaration(insn_table * entry,lf * file,void * data,insn * instruction,int depth)65 print_semantic_declaration(insn_table *entry,
66 lf *file,
67 void *data,
68 insn *instruction,
69 int depth)
70 {
71 if (generate_expanded_instructions) {
72 ASSERT(entry->nr_insn == 1);
73 print_semantic_function_header(file,
74 instruction->file_entry->fields[insn_name],
75 entry->expanded_bits,
76 0/* is not function definition*/);
77 }
78 else {
79 print_semantic_function_header(file,
80 instruction->file_entry->fields[insn_name],
81 NULL,
82 0/* is not function definition*/);
83 }
84 }
85
86
87
88 /* generate the semantics.c file */
89
90
91 void
print_idecode_illegal(lf * file,const char * result)92 print_idecode_illegal(lf *file,
93 const char *result)
94 {
95 if ((code & generate_jumps))
96 lf_printf(file, "goto %s_illegal;\n", (code & generate_with_icache) ? "icache" : "semantic");
97 else if ((code & generate_with_icache))
98 lf_printf(file, "%s icache_illegal(%s);\n", result, ICACHE_FUNCTION_ACTUAL);
99 else
100 lf_printf(file, "%s semantic_illegal(%s);\n", result, SEMANTIC_FUNCTION_ACTUAL);
101 }
102
103
104 void
print_semantic_body(lf * file,insn * instruction,insn_bits * expanded_bits,opcode_field * opcodes)105 print_semantic_body(lf *file,
106 insn *instruction,
107 insn_bits *expanded_bits,
108 opcode_field *opcodes)
109 {
110 print_itrace(file, instruction->file_entry, 0/*put_value_in_cache*/);
111
112 /* validate the instruction, if a cache this has already been done */
113 if (!(code & generate_with_icache))
114 print_idecode_validate(file, instruction, opcodes);
115
116 /* generate the profiling call - this is delayed until after the
117 instruction has been verified */
118 lf_printf(file, "\n");
119 lf_printf(file, "/* monitoring: */\n");
120 lf_printf(file, "if (WITH_MON & MONITOR_INSTRUCTION_ISSUE) {\n");
121 lf_printf(file, " mon_issue(");
122 print_function_name(file,
123 instruction->file_entry->fields[insn_name],
124 NULL,
125 function_name_prefix_itable);
126 lf_printf(file, ", processor, cia);\n");
127 lf_printf(file, "}\n");
128
129 /* generate the code (or at least something */
130 lf_printf(file, "\n");
131 lf_printf(file, "/* semantics: */\n");
132 lf_printf(file, "nia = cia + %d;\n", insn_bit_size / 8);
133 if (instruction->file_entry->annex != NULL) {
134 /* true code */
135 table_entry_print_cpp_line_nr(file, instruction->file_entry);
136 lf_printf(file, "{\n");
137 lf_indent(file, +2);
138 lf_print__c_code(file, instruction->file_entry->annex);
139 lf_indent(file, -2);
140 lf_printf(file, "}\n");
141 lf_print__internal_reference(file);
142 }
143 else if (it_is("nop", instruction->file_entry->fields[insn_flags])) {
144 lf_print__internal_reference(file);
145 }
146 else {
147 /* abort so it is implemented now */
148 table_entry_print_cpp_line_nr(file, instruction->file_entry);
149 lf_putstr(file, "error(\"%s:%d:0x%08lx:%s unimplemented\\n\",\n");
150 lf_printf(file, " itable[MY_INDEX].file, itable[MY_INDEX].line_nr, (long)cia, itable[MY_INDEX].name);\n");
151 lf_print__internal_reference(file);
152 }
153 }
154
155 static void
print_c_semantic(lf * file,insn * instruction,insn_bits * expanded_bits,opcode_field * opcodes,cache_table * cache_rules)156 print_c_semantic(lf *file,
157 insn *instruction,
158 insn_bits *expanded_bits,
159 opcode_field *opcodes,
160 cache_table *cache_rules)
161 {
162
163 lf_printf(file, "{\n");
164 lf_indent(file, +2);
165
166 print_my_defines(file, expanded_bits, instruction->file_entry);
167 lf_printf(file, "\n");
168 print_icache_body(file,
169 instruction,
170 expanded_bits,
171 cache_rules,
172 ((code & generate_with_direct_access)
173 ? define_variables
174 : declare_variables),
175 ((code & generate_with_icache)
176 ? get_values_from_icache
177 : do_not_use_icache));
178
179 lf_printf(file, "unsigned_word nia;\n");
180 print_semantic_body(file,
181 instruction,
182 expanded_bits,
183 opcodes);
184 lf_printf(file, "return nia;\n");
185
186 /* generate something to clean up any #defines created for the cache */
187 if (code & generate_with_direct_access)
188 print_icache_body(file,
189 instruction,
190 expanded_bits,
191 cache_rules,
192 undef_variables,
193 ((code & generate_with_icache)
194 ? get_values_from_icache
195 : do_not_use_icache));
196
197 lf_indent(file, -2);
198 lf_printf(file, "}\n");
199 }
200
201 static void
print_c_semantic_function(lf * file,insn * instruction,insn_bits * expanded_bits,opcode_field * opcodes,cache_table * cache_rules)202 print_c_semantic_function(lf *file,
203 insn *instruction,
204 insn_bits *expanded_bits,
205 opcode_field *opcodes,
206 cache_table *cache_rules)
207 {
208 /* build the semantic routine to execute the instruction */
209 print_semantic_function_header(file,
210 instruction->file_entry->fields[insn_name],
211 expanded_bits,
212 1/*is-function-definition*/);
213 print_c_semantic(file,
214 instruction,
215 expanded_bits,
216 opcodes,
217 cache_rules);
218 }
219
220 void
print_semantic_definition(insn_table * entry,lf * file,void * data,insn * instruction,int depth)221 print_semantic_definition(insn_table *entry,
222 lf *file,
223 void *data,
224 insn *instruction,
225 int depth)
226 {
227 cache_table *cache_rules = (cache_table*)data;
228 if (generate_expanded_instructions) {
229 ASSERT(entry->nr_insn == 1
230 && entry->opcode == NULL
231 && entry->parent != NULL
232 && entry->parent->opcode != NULL);
233 ASSERT(entry->nr_insn == 1
234 && entry->opcode == NULL
235 && entry->parent != NULL
236 && entry->parent->opcode != NULL
237 && entry->parent->opcode_rule != NULL);
238 print_c_semantic_function(file,
239 entry->insns,
240 entry->expanded_bits,
241 entry->parent->opcode,
242 cache_rules);
243 }
244 else {
245 print_c_semantic_function(file, instruction,
246 NULL, NULL,
247 cache_rules);
248 }
249 }
250