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c906108c | 1 | /* Main simulator loop for CGEN-based simulators. |
32d0add0 | 2 | Copyright (C) 1998-2015 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 | ||
36 | #include "sim-main.h" | |
37 | #include "sim-assert.h" | |
38 | ||
39 | #ifndef SIM_ENGINE_PREFIX_HOOK | |
40 | #define SIM_ENGINE_PREFIX_HOOK(sd) | |
41 | #endif | |
42 | #ifndef SIM_ENGINE_POSTFIX_HOOK | |
43 | #define SIM_ENGINE_POSTFIX_HOOK(sd) | |
44 | #endif | |
45 | ||
46 | static sim_event_handler has_stepped; | |
47 | static void prime_cpu (SIM_CPU *, int); | |
48 | static void engine_run_1 (SIM_DESC, int, int); | |
49 | static void engine_run_n (SIM_DESC, int, int, int, int); | |
50 | ||
51 | /* sim_resume for cgen */ | |
52 | ||
53 | void | |
54 | sim_resume (SIM_DESC sd, int step, int siggnal) | |
55 | { | |
56 | sim_engine *engine = STATE_ENGINE (sd); | |
57 | jmp_buf buf; | |
58 | int jmpval; | |
59 | ||
60 | ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
61 | ||
62 | /* we only want to be single stepping the simulator once */ | |
63 | if (engine->stepper != NULL) | |
64 | { | |
65 | sim_events_deschedule (sd, engine->stepper); | |
66 | engine->stepper = NULL; | |
67 | } | |
68 | if (step) | |
69 | engine->stepper = sim_events_schedule (sd, 1, has_stepped, sd); | |
70 | ||
71 | sim_module_resume (sd); | |
72 | ||
73 | #if WITH_SCACHE | |
74 | if (USING_SCACHE_P (sd)) | |
75 | scache_flush (sd); | |
76 | #endif | |
77 | ||
78 | /* run/resume the simulator */ | |
79 | ||
80 | sim_engine_set_run_state (sd, sim_running, 0); | |
81 | ||
82 | engine->jmpbuf = &buf; | |
83 | jmpval = setjmp (buf); | |
84 | if (jmpval == sim_engine_start_jmpval | |
85 | || jmpval == sim_engine_restart_jmpval) | |
86 | { | |
87 | int last_cpu_nr = sim_engine_last_cpu_nr (sd); | |
88 | int next_cpu_nr = sim_engine_next_cpu_nr (sd); | |
89 | int nr_cpus = sim_engine_nr_cpus (sd); | |
90 | /* ??? Setting max_insns to 0 allows pbb/jit code to run wild and is | |
91 | useful if all one wants to do is run a benchmark. Need some better | |
92 | way to identify this case. */ | |
93 | int max_insns = (step | |
94 | ? 1 | |
7a292a7a SS |
95 | : (nr_cpus == 1 |
96 | /*&& wip:no-events*/ | |
97 | /* Don't do this if running under gdb, need to | |
98 | poll ui for events. */ | |
99 | && STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE) | |
c906108c | 100 | ? 0 |
7a292a7a | 101 | : 8); /*FIXME: magic number*/ |
c906108c SS |
102 | int fast_p = STATE_RUN_FAST_P (sd); |
103 | ||
104 | sim_events_preprocess (sd, last_cpu_nr >= nr_cpus, next_cpu_nr >= nr_cpus); | |
105 | if (next_cpu_nr >= nr_cpus) | |
106 | next_cpu_nr = 0; | |
107 | if (nr_cpus == 1) | |
108 | engine_run_1 (sd, max_insns, fast_p); | |
109 | else | |
110 | engine_run_n (sd, next_cpu_nr, nr_cpus, max_insns, fast_p); | |
111 | } | |
112 | #if 1 /*wip*/ | |
113 | else | |
114 | { | |
115 | /* Account for the last insn executed. */ | |
116 | SIM_CPU *cpu = STATE_CPU (sd, sim_engine_last_cpu_nr (sd)); | |
117 | ++ CPU_INSN_COUNT (cpu); | |
db7858e2 | 118 | CGEN_TRACE_INSN_FINI (cpu, NULL, 1); |
c906108c SS |
119 | } |
120 | #endif | |
121 | ||
122 | engine->jmpbuf = NULL; | |
123 | ||
124 | { | |
125 | int i; | |
126 | int nr_cpus = sim_engine_nr_cpus (sd); | |
127 | ||
128 | #if 0 /*wip,ignore*/ | |
129 | /* If the loop exits, either we single-stepped or @cpu@_engine_stop | |
130 | was called. */ | |
131 | if (step) | |
132 | sim_engine_set_run_state (sd, sim_stopped, SIM_SIGTRAP); | |
133 | else | |
134 | sim_engine_set_run_state (sd, pending_reason, pending_sigrc); | |
135 | #endif | |
136 | ||
137 | for (i = 0; i < nr_cpus; ++i) | |
138 | { | |
139 | SIM_CPU *cpu = STATE_CPU (sd, i); | |
140 | ||
141 | PROFILE_TOTAL_INSN_COUNT (CPU_PROFILE_DATA (cpu)) += CPU_INSN_COUNT (cpu); | |
142 | } | |
143 | } | |
144 | ||
145 | sim_module_suspend (sd); | |
146 | } | |
147 | ||
148 | /* Halt the simulator after just one instruction. */ | |
149 | ||
150 | static void | |
151 | has_stepped (SIM_DESC sd, void *data) | |
152 | { | |
153 | ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
154 | sim_engine_halt (sd, NULL, NULL, NULL_CIA, sim_stopped, SIM_SIGTRAP); | |
155 | } | |
156 | ||
157 | /* Prepare a cpu for running. | |
158 | MAX_INSNS is the number of insns to execute per time slice. | |
159 | If 0 it means the cpu can run as long as it wants (e.g. until the | |
160 | program completes). | |
161 | ??? Perhaps this should be an argument to the engine_fn. */ | |
162 | ||
163 | static void | |
164 | prime_cpu (SIM_CPU *cpu, int max_insns) | |
165 | { | |
166 | CPU_MAX_SLICE_INSNS (cpu) = max_insns; | |
167 | CPU_INSN_COUNT (cpu) = 0; | |
168 | ||
169 | /* Initialize the insn descriptor table. | |
170 | This has to be done after all initialization so we just defer it to | |
171 | here. */ | |
172 | ||
173 | if (MACH_PREPARE_RUN (CPU_MACH (cpu))) | |
174 | (* MACH_PREPARE_RUN (CPU_MACH (cpu))) (cpu); | |
175 | } | |
176 | ||
177 | /* Main loop, for 1 cpu. */ | |
178 | ||
179 | static void | |
180 | engine_run_1 (SIM_DESC sd, int max_insns, int fast_p) | |
181 | { | |
182 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
183 | ENGINE_FN *fn = fast_p ? CPU_FAST_ENGINE_FN (cpu) : CPU_FULL_ENGINE_FN (cpu); | |
184 | ||
185 | prime_cpu (cpu, max_insns); | |
186 | ||
187 | while (1) | |
188 | { | |
189 | SIM_ENGINE_PREFIX_HOOK (sd); | |
190 | ||
191 | (*fn) (cpu); | |
192 | ||
193 | SIM_ENGINE_POSTFIX_HOOK (sd); | |
194 | ||
195 | /* process any events */ | |
196 | if (sim_events_tick (sd)) | |
197 | sim_events_process (sd); | |
198 | } | |
199 | } | |
200 | ||
201 | /* Main loop, for multiple cpus. */ | |
202 | ||
203 | static void | |
204 | engine_run_n (SIM_DESC sd, int next_cpu_nr, int nr_cpus, int max_insns, int fast_p) | |
205 | { | |
206 | int i; | |
207 | ENGINE_FN *engine_fns[MAX_NR_PROCESSORS]; | |
208 | ||
209 | for (i = 0; i < nr_cpus; ++i) | |
210 | { | |
211 | SIM_CPU *cpu = STATE_CPU (sd, i); | |
212 | ||
213 | engine_fns[i] = fast_p ? CPU_FAST_ENGINE_FN (cpu) : CPU_FULL_ENGINE_FN (cpu); | |
214 | prime_cpu (cpu, max_insns); | |
215 | } | |
216 | ||
217 | while (1) | |
218 | { | |
219 | SIM_ENGINE_PREFIX_HOOK (sd); | |
220 | ||
221 | /* FIXME: proper cycling of all of them, blah blah blah. */ | |
222 | while (next_cpu_nr != nr_cpus) | |
223 | { | |
224 | SIM_CPU *cpu = STATE_CPU (sd, next_cpu_nr); | |
225 | ||
226 | (* engine_fns[next_cpu_nr]) (cpu); | |
227 | ++next_cpu_nr; | |
228 | } | |
229 | ||
230 | SIM_ENGINE_POSTFIX_HOOK (sd); | |
231 | ||
232 | /* process any events */ | |
233 | if (sim_events_tick (sd)) | |
234 | sim_events_process (sd); | |
235 | } | |
236 | } |