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c906108c | 1 | /* Main simulator loop for CGEN-based simulators. |
3666a048 | 2 | Copyright (C) 1998-2021 Free Software Foundation, Inc. |
c906108c SS |
3 | Contributed by Cygnus Solutions. |
4 | ||
5 | This file is part of GDB, the GNU debugger. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
4744ac1b JB |
9 | the Free Software Foundation; either version 3 of the License, or |
10 | (at your option) any later version. | |
c906108c SS |
11 | |
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
4744ac1b JB |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
c906108c SS |
19 | |
20 | /* ??? These are old notes, kept around for now. | |
21 | Collecting profile data and tracing slow us down so we don't do them in | |
22 | "fast mode". | |
23 | There are 6 possibilities on 2 axes: | |
24 | - no-scaching, insn-scaching, basic-block-scaching | |
25 | - run with full features or run fast | |
26 | Supporting all six possibilities in one executable is a bit much but | |
27 | supporting full/fast seems reasonable. | |
28 | If the scache is configured in it is always used. | |
29 | If pbb-scaching is configured in it is always used. | |
30 | ??? Sometimes supporting more than one set of semantic functions will make | |
31 | the simulator too large - this should be configurable. Blah blah blah. | |
32 | ??? Supporting full/fast can be more modular, blah blah blah. | |
33 | When the framework is more modular, this can be. | |
34 | */ | |
35 | ||
6df01ab8 MF |
36 | /* This must come before any other includes. */ |
37 | #include "defs.h" | |
38 | ||
c906108c SS |
39 | #include "sim-main.h" |
40 | #include "sim-assert.h" | |
41 | ||
42 | #ifndef SIM_ENGINE_PREFIX_HOOK | |
43 | #define SIM_ENGINE_PREFIX_HOOK(sd) | |
44 | #endif | |
45 | #ifndef SIM_ENGINE_POSTFIX_HOOK | |
46 | #define SIM_ENGINE_POSTFIX_HOOK(sd) | |
47 | #endif | |
48 | ||
49 | static sim_event_handler has_stepped; | |
50 | static void prime_cpu (SIM_CPU *, int); | |
51 | static void engine_run_1 (SIM_DESC, int, int); | |
52 | static void engine_run_n (SIM_DESC, int, int, int, int); | |
53 | ||
906192d7 MF |
54 | /* If no profiling or tracing has been enabled, run in fast mode. */ |
55 | static int | |
56 | cgen_get_fast_p (SIM_DESC sd) | |
57 | { | |
58 | int i, c; | |
59 | int run_fast_p = 1; | |
60 | ||
61 | for (c = 0; c < MAX_NR_PROCESSORS; ++c) | |
62 | { | |
63 | SIM_CPU *cpu = STATE_CPU (sd, c); | |
64 | ||
65 | if (PROFILE_ANY_P (cpu) || TRACE_ANY_P (cpu)) | |
66 | return 0; | |
67 | } | |
68 | ||
69 | return 1; | |
70 | } | |
71 | ||
c906108c SS |
72 | /* sim_resume for cgen */ |
73 | ||
74 | void | |
75 | sim_resume (SIM_DESC sd, int step, int siggnal) | |
76 | { | |
77 | sim_engine *engine = STATE_ENGINE (sd); | |
78 | jmp_buf buf; | |
79 | int jmpval; | |
906192d7 | 80 | static int fast_p = -1; |
c906108c SS |
81 | |
82 | ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
83 | ||
906192d7 MF |
84 | if (fast_p == -1) |
85 | fast_p = cgen_get_fast_p (sd); | |
86 | ||
c906108c SS |
87 | /* we only want to be single stepping the simulator once */ |
88 | if (engine->stepper != NULL) | |
89 | { | |
90 | sim_events_deschedule (sd, engine->stepper); | |
91 | engine->stepper = NULL; | |
92 | } | |
93 | if (step) | |
94 | engine->stepper = sim_events_schedule (sd, 1, has_stepped, sd); | |
95 | ||
96 | sim_module_resume (sd); | |
97 | ||
98 | #if WITH_SCACHE | |
99 | if (USING_SCACHE_P (sd)) | |
100 | scache_flush (sd); | |
101 | #endif | |
102 | ||
103 | /* run/resume the simulator */ | |
104 | ||
105 | sim_engine_set_run_state (sd, sim_running, 0); | |
106 | ||
107 | engine->jmpbuf = &buf; | |
108 | jmpval = setjmp (buf); | |
109 | if (jmpval == sim_engine_start_jmpval | |
110 | || jmpval == sim_engine_restart_jmpval) | |
111 | { | |
112 | int last_cpu_nr = sim_engine_last_cpu_nr (sd); | |
113 | int next_cpu_nr = sim_engine_next_cpu_nr (sd); | |
114 | int nr_cpus = sim_engine_nr_cpus (sd); | |
115 | /* ??? Setting max_insns to 0 allows pbb/jit code to run wild and is | |
116 | useful if all one wants to do is run a benchmark. Need some better | |
117 | way to identify this case. */ | |
118 | int max_insns = (step | |
119 | ? 1 | |
7a292a7a SS |
120 | : (nr_cpus == 1 |
121 | /*&& wip:no-events*/ | |
122 | /* Don't do this if running under gdb, need to | |
123 | poll ui for events. */ | |
124 | && STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE) | |
c906108c | 125 | ? 0 |
7a292a7a | 126 | : 8); /*FIXME: magic number*/ |
c906108c SS |
127 | |
128 | sim_events_preprocess (sd, last_cpu_nr >= nr_cpus, next_cpu_nr >= nr_cpus); | |
129 | if (next_cpu_nr >= nr_cpus) | |
130 | next_cpu_nr = 0; | |
131 | if (nr_cpus == 1) | |
132 | engine_run_1 (sd, max_insns, fast_p); | |
133 | else | |
134 | engine_run_n (sd, next_cpu_nr, nr_cpus, max_insns, fast_p); | |
135 | } | |
136 | #if 1 /*wip*/ | |
137 | else | |
138 | { | |
139 | /* Account for the last insn executed. */ | |
140 | SIM_CPU *cpu = STATE_CPU (sd, sim_engine_last_cpu_nr (sd)); | |
141 | ++ CPU_INSN_COUNT (cpu); | |
db7858e2 | 142 | CGEN_TRACE_INSN_FINI (cpu, NULL, 1); |
c906108c SS |
143 | } |
144 | #endif | |
145 | ||
146 | engine->jmpbuf = NULL; | |
147 | ||
148 | { | |
149 | int i; | |
150 | int nr_cpus = sim_engine_nr_cpus (sd); | |
151 | ||
152 | #if 0 /*wip,ignore*/ | |
153 | /* If the loop exits, either we single-stepped or @cpu@_engine_stop | |
154 | was called. */ | |
155 | if (step) | |
156 | sim_engine_set_run_state (sd, sim_stopped, SIM_SIGTRAP); | |
157 | else | |
158 | sim_engine_set_run_state (sd, pending_reason, pending_sigrc); | |
159 | #endif | |
160 | ||
161 | for (i = 0; i < nr_cpus; ++i) | |
162 | { | |
163 | SIM_CPU *cpu = STATE_CPU (sd, i); | |
164 | ||
165 | PROFILE_TOTAL_INSN_COUNT (CPU_PROFILE_DATA (cpu)) += CPU_INSN_COUNT (cpu); | |
166 | } | |
167 | } | |
168 | ||
169 | sim_module_suspend (sd); | |
170 | } | |
171 | ||
172 | /* Halt the simulator after just one instruction. */ | |
173 | ||
174 | static void | |
175 | has_stepped (SIM_DESC sd, void *data) | |
176 | { | |
177 | ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
178 | sim_engine_halt (sd, NULL, NULL, NULL_CIA, sim_stopped, SIM_SIGTRAP); | |
179 | } | |
180 | ||
181 | /* Prepare a cpu for running. | |
182 | MAX_INSNS is the number of insns to execute per time slice. | |
183 | If 0 it means the cpu can run as long as it wants (e.g. until the | |
184 | program completes). | |
185 | ??? Perhaps this should be an argument to the engine_fn. */ | |
186 | ||
187 | static void | |
188 | prime_cpu (SIM_CPU *cpu, int max_insns) | |
189 | { | |
190 | CPU_MAX_SLICE_INSNS (cpu) = max_insns; | |
191 | CPU_INSN_COUNT (cpu) = 0; | |
192 | ||
193 | /* Initialize the insn descriptor table. | |
194 | This has to be done after all initialization so we just defer it to | |
195 | here. */ | |
196 | ||
197 | if (MACH_PREPARE_RUN (CPU_MACH (cpu))) | |
198 | (* MACH_PREPARE_RUN (CPU_MACH (cpu))) (cpu); | |
199 | } | |
200 | ||
201 | /* Main loop, for 1 cpu. */ | |
202 | ||
203 | static void | |
204 | engine_run_1 (SIM_DESC sd, int max_insns, int fast_p) | |
205 | { | |
206 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
207 | ENGINE_FN *fn = fast_p ? CPU_FAST_ENGINE_FN (cpu) : CPU_FULL_ENGINE_FN (cpu); | |
208 | ||
209 | prime_cpu (cpu, max_insns); | |
210 | ||
211 | while (1) | |
212 | { | |
213 | SIM_ENGINE_PREFIX_HOOK (sd); | |
214 | ||
215 | (*fn) (cpu); | |
216 | ||
217 | SIM_ENGINE_POSTFIX_HOOK (sd); | |
218 | ||
219 | /* process any events */ | |
220 | if (sim_events_tick (sd)) | |
221 | sim_events_process (sd); | |
222 | } | |
223 | } | |
224 | ||
225 | /* Main loop, for multiple cpus. */ | |
226 | ||
227 | static void | |
228 | engine_run_n (SIM_DESC sd, int next_cpu_nr, int nr_cpus, int max_insns, int fast_p) | |
229 | { | |
230 | int i; | |
231 | ENGINE_FN *engine_fns[MAX_NR_PROCESSORS]; | |
232 | ||
233 | for (i = 0; i < nr_cpus; ++i) | |
234 | { | |
235 | SIM_CPU *cpu = STATE_CPU (sd, i); | |
236 | ||
237 | engine_fns[i] = fast_p ? CPU_FAST_ENGINE_FN (cpu) : CPU_FULL_ENGINE_FN (cpu); | |
238 | prime_cpu (cpu, max_insns); | |
239 | } | |
240 | ||
241 | while (1) | |
242 | { | |
243 | SIM_ENGINE_PREFIX_HOOK (sd); | |
244 | ||
245 | /* FIXME: proper cycling of all of them, blah blah blah. */ | |
246 | while (next_cpu_nr != nr_cpus) | |
247 | { | |
248 | SIM_CPU *cpu = STATE_CPU (sd, next_cpu_nr); | |
249 | ||
250 | (* engine_fns[next_cpu_nr]) (cpu); | |
251 | ++next_cpu_nr; | |
252 | } | |
253 | ||
254 | SIM_ENGINE_POSTFIX_HOOK (sd); | |
255 | ||
256 | /* process any events */ | |
257 | if (sim_events_tick (sd)) | |
258 | sim_events_process (sd); | |
259 | } | |
260 | } |