* gas/config/tc-avr.c: Change ISA for devices with USB support to
[external/binutils.git] / sim / ppc / cpu.c
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 #ifndef _CPU_C_
22 #define _CPU_C_
23
24 #include <setjmp.h>
25
26 #include "cpu.h"
27 #include "idecode.h"
28
29 #ifdef HAVE_STRING_H
30 #include <string.h>
31 #else
32 #ifdef HAVE_STRINGS_H
33 #include <strings.h>
34 #endif
35 #endif
36
37 struct _cpu {
38
39   /* the registers */
40   registers regs;
41
42   /* current instruction address */
43   unsigned_word program_counter;
44
45   /* the memory maps */
46   core *physical; /* all of memory */
47   vm *virtual;
48   vm_instruction_map *instruction_map; /* instructions */
49   vm_data_map *data_map; /* data */
50
51   /* the system this processor is contained within */
52   cpu_mon *monitor;
53   os_emul *os_emulation;
54   psim *system;
55   event_queue *events;
56   int cpu_nr;
57
58   /* Current CPU model information */
59   model_data *model_ptr;
60
61 #if WITH_IDECODE_CACHE_SIZE
62   /* a cache to store cracked instructions */
63   idecode_cache icache[WITH_IDECODE_CACHE_SIZE];
64 #endif
65
66   /* any interrupt state */
67   interrupts ints;
68
69   /* address reservation: keep the physical address and the contents
70      of memory at that address */
71   memory_reservation reservation;
72
73   /* offset from event time to this cpu's idea of the local time */
74   signed64 time_base_local_time;
75   signed64 decrementer_local_time;
76   event_entry_tag decrementer_event;
77
78 };
79
80 INLINE_CPU\
81 (cpu *)
82 cpu_create(psim *system,
83            core *memory,
84            cpu_mon *monitor,
85            os_emul *os_emulation,
86            int cpu_nr)
87 {
88   cpu *processor = ZALLOC(cpu);
89
90   /* create the virtual memory map from the core */
91   processor->physical = memory;
92   processor->virtual = vm_create(memory);
93   processor->instruction_map = vm_create_instruction_map(processor->virtual);
94   processor->data_map = vm_create_data_map(processor->virtual);
95
96   if (CURRENT_MODEL_ISSUE > 0)
97     processor->model_ptr = model_create (processor);
98
99   /* link back to core system */
100   processor->system = system;
101   processor->events = psim_event_queue(system);
102   processor->cpu_nr = cpu_nr;
103   processor->monitor = monitor;
104   processor->os_emulation = os_emulation;
105
106   return processor;
107 }
108
109
110 INLINE_CPU\
111 (void)
112 cpu_init(cpu *processor)
113 {
114   memset(&processor->regs, 0, sizeof(processor->regs));
115   /* vm init is delayed until after the device tree has been init as
116      the devices may further init the cpu */
117   if (CURRENT_MODEL_ISSUE > 0)
118     model_init (processor->model_ptr);
119 }
120
121
122 /* find ones way home */
123
124 INLINE_CPU\
125 (psim *)
126 cpu_system(cpu *processor)
127 {
128   return processor->system;
129 }
130
131 INLINE_CPU\
132 (int)
133 cpu_nr(cpu *processor)
134 {
135   return processor->cpu_nr;
136 }
137
138 INLINE_CPU\
139 (cpu_mon *)
140 cpu_monitor(cpu *processor)
141 {
142   return processor->monitor;
143 }
144
145 INLINE_CPU\
146 (os_emul *)
147 cpu_os_emulation(cpu *processor)
148 {
149   return processor->os_emulation;
150 }
151
152 INLINE_CPU\
153 (model_data *)
154 cpu_model(cpu *processor)
155 {
156   return processor->model_ptr;
157 }
158
159
160 /* program counter manipulation */
161
162 INLINE_CPU\
163 (void)
164 cpu_set_program_counter(cpu *processor,
165                         unsigned_word new_program_counter)
166 {
167   processor->program_counter = new_program_counter;
168 }
169
170 INLINE_CPU\
171 (unsigned_word)
172 cpu_get_program_counter(cpu *processor)
173 {
174   return processor->program_counter;
175 }
176
177
178 INLINE_CPU\
179 (void)
180 cpu_restart(cpu *processor,
181             unsigned_word nia)
182 {
183   ASSERT(processor != NULL);
184   cpu_set_program_counter(processor, nia);
185   psim_restart(processor->system, processor->cpu_nr);
186 }
187
188 INLINE_CPU\
189 (void)
190 cpu_halt(cpu *processor,
191          unsigned_word nia,
192          stop_reason reason,
193          int signal)
194 {
195   ASSERT(processor != NULL);
196   if (CURRENT_MODEL_ISSUE > 0)
197     model_halt(processor->model_ptr);
198   cpu_set_program_counter(processor, nia);
199   psim_halt(processor->system, processor->cpu_nr, reason, signal);
200 }
201
202 EXTERN_CPU\
203 (void)
204 cpu_error(cpu *processor,
205           unsigned_word cia,
206           const char *fmt,
207           ...)
208 {
209   char message[1024];
210   va_list ap;
211
212   /* format the message */
213   va_start(ap, fmt);
214   vsprintf(message, fmt, ap);
215   va_end(ap);
216
217   /* sanity check */
218   if (strlen(message) >= sizeof(message))
219     error("cpu_error: buffer overflow");
220
221   if (processor != NULL) {
222     printf_filtered("cpu %d, cia 0x%lx: %s\n",
223                     processor->cpu_nr + 1, (unsigned long)cia, message);
224     cpu_halt(processor, cia, was_signalled, -1);
225   }
226   else {
227     error("cpu: %s", message);
228   }
229 }
230
231
232 /* The processors local concept of time */
233
234 INLINE_CPU\
235 (signed64)
236 cpu_get_time_base(cpu *processor)
237 {
238   return (event_queue_time(processor->events)
239           - processor->time_base_local_time);
240 }
241
242 INLINE_CPU\
243 (void)
244 cpu_set_time_base(cpu *processor,
245                   signed64 time_base)
246 {
247   processor->time_base_local_time = (event_queue_time(processor->events)
248                                      - time_base);
249 }
250
251 INLINE_CPU\
252 (signed32)
253 cpu_get_decrementer(cpu *processor)
254 {
255   return (processor->decrementer_local_time
256           - event_queue_time(processor->events));
257 }
258
259 STATIC_INLINE_CPU\
260 (void)
261 cpu_decrement_event(void *data)
262 {
263   cpu *processor = (cpu*)data;
264   processor->decrementer_event = NULL;
265   decrementer_interrupt(processor);
266 }
267
268 INLINE_CPU\
269 (void)
270 cpu_set_decrementer(cpu *processor,
271                     signed32 decrementer)
272 {
273   signed64 old_decrementer = cpu_get_decrementer(processor);
274   event_queue_deschedule(processor->events, processor->decrementer_event);
275   processor->decrementer_event = NULL;
276   processor->decrementer_local_time = (event_queue_time(processor->events)
277                                        + decrementer);
278   if (decrementer < 0 && old_decrementer >= 0)
279     /* A decrementer interrupt occures if the sign of the decrement
280        register is changed from positive to negative by the load
281        instruction */
282     decrementer_interrupt(processor);
283   else if (decrementer >= 0)
284     processor->decrementer_event = event_queue_schedule(processor->events,
285                                                         decrementer,
286                                                         cpu_decrement_event,
287                                                         processor);
288 }
289
290
291 #if WITH_IDECODE_CACHE_SIZE
292 /* allow access to the cpu's instruction cache */
293 INLINE_CPU\
294 (idecode_cache *)
295 cpu_icache_entry(cpu *processor,
296                  unsigned_word cia)
297 {
298   return &processor->icache[cia / 4 % WITH_IDECODE_CACHE_SIZE];
299 }
300
301
302 INLINE_CPU\
303 (void)
304 cpu_flush_icache(cpu *processor)
305 {
306   int i;
307   /* force all addresses to 0xff... so that they never hit */
308   for (i = 0; i < WITH_IDECODE_CACHE_SIZE; i++)
309     processor->icache[i].address = MASK(0, 63);
310 }
311 #endif
312
313
314 /* address map revelation */
315
316 INLINE_CPU\
317 (vm_instruction_map *)
318 cpu_instruction_map(cpu *processor)
319 {
320   return processor->instruction_map;
321 }
322
323 INLINE_CPU\
324 (vm_data_map *)
325 cpu_data_map(cpu *processor)
326 {
327   return processor->data_map;
328 }
329
330 INLINE_CPU\
331 (void)
332 cpu_page_tlb_invalidate_entry(cpu *processor,
333                               unsigned_word ea)
334 {
335   vm_page_tlb_invalidate_entry(processor->virtual, ea);
336 }
337
338 INLINE_CPU\
339 (void)
340 cpu_page_tlb_invalidate_all(cpu *processor)
341 {
342   vm_page_tlb_invalidate_all(processor->virtual);
343 }
344
345
346 /* interrupt access */
347
348 INLINE_CPU\
349 (interrupts *)
350 cpu_interrupts(cpu *processor)
351 {
352   return &processor->ints;
353 }
354
355
356
357 /* reservation access */
358
359 INLINE_CPU\
360 (memory_reservation *)
361 cpu_reservation(cpu *processor)
362 {
363   return &processor->reservation;
364 }
365
366
367 /* register access */
368
369 INLINE_CPU\
370 (registers *)
371 cpu_registers(cpu *processor)
372 {
373   return &processor->regs;
374 }
375
376 INLINE_CPU\
377 (void)
378 cpu_synchronize_context(cpu *processor,
379                         unsigned_word cia)
380 {
381 #if (WITH_IDECODE_CACHE_SIZE)
382   /* kill of the cache */
383   cpu_flush_icache(processor);
384 #endif
385
386   /* update virtual memory */
387   vm_synchronize_context(processor->virtual,
388                          processor->regs.spr,
389                          processor->regs.sr,
390                          processor->regs.msr,
391                          processor, cia);
392 }
393
394
395 /* might again be useful one day */
396
397 INLINE_CPU\
398 (void)
399 cpu_print_info(cpu *processor, int verbose)
400 {
401 }
402
403 #endif /* _CPU_C_ */