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1 | /* gdb-if.c -- sim interface to GDB. |
2 | ||
8acc9f48 | 3 | Copyright (C) 2011-2013 Free Software Foundation, Inc. |
9058f767 KB |
4 | Contributed by Red Hat, Inc. |
5 | ||
6 | This file is part of the GNU simulators. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include <stdio.h> | |
23 | #include <assert.h> | |
24 | #include <signal.h> | |
25 | #include <string.h> | |
26 | #include <ctype.h> | |
27 | #include <stdlib.h> | |
28 | ||
29 | #include "ansidecl.h" | |
30 | #include "gdb/callback.h" | |
31 | #include "gdb/remote-sim.h" | |
32 | #include "gdb/signals.h" | |
33 | #include "gdb/sim-rl78.h" | |
34 | ||
35 | #include "cpu.h" | |
36 | #include "mem.h" | |
37 | #include "load.h" | |
38 | #include "trace.h" | |
39 | ||
40 | /* Ideally, we'd wrap up all the minisim's data structures in an | |
41 | object and pass that around. However, neither GDB nor run needs | |
42 | that ability. | |
43 | ||
44 | So we just have one instance, that lives in global variables, and | |
45 | each time we open it, we re-initialize it. */ | |
46 | ||
47 | struct sim_state | |
48 | { | |
49 | const char *message; | |
50 | }; | |
51 | ||
52 | static struct sim_state the_minisim = { | |
53 | "This is the sole rl78 minisim instance." | |
54 | }; | |
55 | ||
56 | static int open; | |
57 | ||
58 | static unsigned char hw_breakpoints[MEM_SIZE/8]; | |
59 | ||
60 | static struct host_callback_struct *host_callbacks; | |
61 | ||
62 | /* Open an instance of the sim. For this sim, only one instance | |
63 | is permitted. If sim_open() is called multiple times, the sim | |
64 | will be reset. */ | |
65 | ||
66 | SIM_DESC | |
67 | sim_open (SIM_OPEN_KIND kind, | |
68 | struct host_callback_struct *callback, | |
69 | struct bfd *abfd, char **argv) | |
70 | { | |
71 | if (open) | |
72 | fprintf (stderr, "rl78 minisim: re-opened sim\n"); | |
73 | ||
74 | /* The 'run' interface doesn't use this function, so we don't care | |
75 | about KIND; it's always SIM_OPEN_DEBUG. */ | |
76 | if (kind != SIM_OPEN_DEBUG) | |
77 | fprintf (stderr, "rl78 minisim: sim_open KIND != SIM_OPEN_DEBUG: %d\n", | |
78 | kind); | |
79 | ||
80 | /* We use this for the load command. Perhaps someday, it'll be used | |
81 | for syscalls too. */ | |
82 | host_callbacks = callback; | |
83 | ||
84 | /* We don't expect any command-line arguments. */ | |
85 | ||
86 | init_cpu (); | |
87 | trace = 0; | |
88 | ||
89 | sim_disasm_init (abfd); | |
90 | open = 1; | |
91 | return &the_minisim; | |
92 | } | |
93 | ||
94 | /* Verify the sim descriptor. Just print a message if the descriptor | |
95 | doesn't match. Nothing bad will happen if the descriptor doesn't | |
96 | match because all of the state is global. But if it doesn't | |
97 | match, that means there's a problem with the caller. */ | |
98 | ||
99 | static void | |
100 | check_desc (SIM_DESC sd) | |
101 | { | |
102 | if (sd != &the_minisim) | |
103 | fprintf (stderr, "rl78 minisim: desc != &the_minisim\n"); | |
104 | } | |
105 | ||
106 | /* Close the sim. */ | |
107 | ||
108 | void | |
109 | sim_close (SIM_DESC sd, int quitting) | |
110 | { | |
111 | check_desc (sd); | |
112 | ||
113 | /* Not much to do. At least free up our memory. */ | |
114 | init_mem (); | |
115 | ||
116 | open = 0; | |
117 | } | |
118 | ||
119 | /* Open the program to run; print a message if the program cannot | |
120 | be opened. */ | |
121 | ||
122 | static bfd * | |
123 | open_objfile (const char *filename) | |
124 | { | |
125 | bfd *prog = bfd_openr (filename, 0); | |
126 | ||
127 | if (!prog) | |
128 | { | |
129 | fprintf (stderr, "Can't read %s\n", filename); | |
130 | return 0; | |
131 | } | |
132 | ||
133 | if (!bfd_check_format (prog, bfd_object)) | |
134 | { | |
135 | fprintf (stderr, "%s not a rl78 program\n", filename); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | return prog; | |
140 | } | |
141 | ||
142 | /* Load a program. */ | |
143 | ||
144 | SIM_RC | |
145 | sim_load (SIM_DESC sd, char *prog, struct bfd *abfd, int from_tty) | |
146 | { | |
147 | check_desc (sd); | |
148 | ||
149 | if (!abfd) | |
150 | abfd = open_objfile (prog); | |
151 | if (!abfd) | |
152 | return SIM_RC_FAIL; | |
153 | ||
154 | rl78_load (abfd, host_callbacks, "sim"); | |
155 | ||
156 | return SIM_RC_OK; | |
157 | } | |
158 | ||
159 | /* Create inferior. */ | |
160 | ||
161 | SIM_RC | |
162 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env) | |
163 | { | |
164 | check_desc (sd); | |
165 | ||
166 | if (abfd) | |
167 | rl78_load (abfd, 0, "sim"); | |
168 | ||
169 | return SIM_RC_OK; | |
170 | } | |
171 | ||
172 | /* Read memory. */ | |
173 | ||
174 | int | |
175 | sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length) | |
176 | { | |
177 | check_desc (sd); | |
178 | ||
179 | if (mem >= MEM_SIZE) | |
180 | return 0; | |
181 | else if (mem + length > MEM_SIZE) | |
182 | length = MEM_SIZE - mem; | |
183 | ||
184 | mem_get_blk (mem, buf, length); | |
185 | return length; | |
186 | } | |
187 | ||
188 | /* Write memory. */ | |
189 | ||
190 | int | |
191 | sim_write (SIM_DESC sd, SIM_ADDR mem, const unsigned char *buf, int length) | |
192 | { | |
193 | check_desc (sd); | |
194 | ||
195 | if (mem >= MEM_SIZE) | |
196 | return 0; | |
197 | else if (mem + length > MEM_SIZE) | |
198 | length = MEM_SIZE - mem; | |
199 | ||
200 | mem_put_blk (mem, buf, length); | |
201 | return length; | |
202 | } | |
203 | ||
204 | /* Read the LENGTH bytes at BUF as an little-endian value. */ | |
205 | ||
206 | static SI | |
207 | get_le (unsigned char *buf, int length) | |
208 | { | |
209 | SI acc = 0; | |
210 | ||
211 | while (--length >= 0) | |
212 | acc = (acc << 8) + buf[length]; | |
213 | ||
214 | return acc; | |
215 | } | |
216 | ||
217 | /* Store VAL as a little-endian value in the LENGTH bytes at BUF. */ | |
218 | ||
219 | static void | |
220 | put_le (unsigned char *buf, int length, SI val) | |
221 | { | |
222 | int i; | |
223 | ||
224 | for (i = 0; i < length; i++) | |
225 | { | |
226 | buf[i] = val & 0xff; | |
227 | val >>= 8; | |
228 | } | |
229 | } | |
230 | ||
231 | /* Verify that REGNO is in the proper range. Return 0 if not and | |
232 | something non-zero if so. */ | |
233 | ||
234 | static int | |
235 | check_regno (enum sim_rl78_regnum regno) | |
236 | { | |
237 | return 0 <= regno && regno < sim_rl78_num_regs; | |
238 | } | |
239 | ||
240 | /* Return the size of the register REGNO. */ | |
241 | ||
242 | static size_t | |
243 | reg_size (enum sim_rl78_regnum regno) | |
244 | { | |
245 | size_t size; | |
246 | ||
247 | if (regno == sim_rl78_pc_regnum) | |
248 | size = 4; | |
249 | else | |
250 | size = 1; | |
251 | ||
252 | return size; | |
253 | } | |
254 | ||
255 | /* Return the register address associated with the register specified by | |
256 | REGNO. */ | |
257 | ||
258 | static unsigned long | |
259 | reg_addr (enum sim_rl78_regnum regno) | |
260 | { | |
261 | if (sim_rl78_bank0_r0_regnum <= regno | |
262 | && regno <= sim_rl78_bank0_r7_regnum) | |
263 | return 0xffef8 + (regno - sim_rl78_bank0_r0_regnum); | |
264 | else if (sim_rl78_bank1_r0_regnum <= regno | |
265 | && regno <= sim_rl78_bank1_r7_regnum) | |
266 | return 0xffef0 + (regno - sim_rl78_bank1_r0_regnum); | |
267 | else if (sim_rl78_bank2_r0_regnum <= regno | |
268 | && regno <= sim_rl78_bank2_r7_regnum) | |
269 | return 0xffee8 + (regno - sim_rl78_bank2_r0_regnum); | |
270 | else if (sim_rl78_bank3_r0_regnum <= regno | |
271 | && regno <= sim_rl78_bank3_r7_regnum) | |
272 | return 0xffee0 + (regno - sim_rl78_bank3_r0_regnum); | |
273 | else if (regno == sim_rl78_psw_regnum) | |
274 | return 0xffffa; | |
275 | else if (regno == sim_rl78_es_regnum) | |
276 | return 0xffffd; | |
277 | else if (regno == sim_rl78_cs_regnum) | |
278 | return 0xffffc; | |
279 | /* Note: We can't handle PC here because it's not memory mapped. */ | |
280 | else if (regno == sim_rl78_spl_regnum) | |
281 | return 0xffff8; | |
282 | else if (regno == sim_rl78_sph_regnum) | |
283 | return 0xffff9; | |
284 | else if (regno == sim_rl78_pmc_regnum) | |
285 | return 0xffffe; | |
286 | else if (regno == sim_rl78_mem_regnum) | |
287 | return 0xfffff; | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | /* Fetch the contents of the register specified by REGNO, placing the | |
293 | contents in BUF. The length LENGTH must match the sim's internal | |
294 | notion of the register's size. */ | |
295 | ||
296 | int | |
297 | sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length) | |
298 | { | |
299 | size_t size; | |
300 | SI val; | |
301 | ||
302 | check_desc (sd); | |
303 | ||
304 | if (!check_regno (regno)) | |
305 | return 0; | |
306 | ||
307 | size = reg_size (regno); | |
308 | ||
309 | if (length != size) | |
310 | return 0; | |
311 | ||
312 | if (regno == sim_rl78_pc_regnum) | |
313 | val = pc; | |
314 | else | |
315 | val = memory[reg_addr (regno)]; | |
316 | ||
317 | put_le (buf, length, val); | |
318 | ||
319 | return size; | |
320 | } | |
321 | ||
322 | /* Store the value stored in BUF to the register REGNO. The length | |
323 | LENGTH must match the sim's internal notion of the register size. */ | |
324 | ||
325 | int | |
326 | sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length) | |
327 | { | |
328 | size_t size; | |
329 | SI val; | |
330 | ||
331 | check_desc (sd); | |
332 | ||
333 | if (!check_regno (regno)) | |
334 | return -1; | |
335 | ||
336 | size = reg_size (regno); | |
337 | ||
338 | if (length != size) | |
339 | return -1; | |
340 | ||
341 | val = get_le (buf, length); | |
342 | ||
343 | if (regno == sim_rl78_pc_regnum) | |
344 | pc = val; | |
345 | else | |
346 | memory[reg_addr (regno)] = val; | |
347 | return size; | |
348 | } | |
349 | ||
350 | /* Print out message associated with "info target". */ | |
351 | ||
352 | void | |
353 | sim_info (SIM_DESC sd, int verbose) | |
354 | { | |
355 | check_desc (sd); | |
356 | ||
357 | printf ("The rl78 minisim doesn't collect any statistics.\n"); | |
358 | } | |
359 | ||
360 | static volatile int stop; | |
361 | static enum sim_stop reason; | |
362 | int siggnal; | |
363 | ||
364 | ||
365 | /* Given a signal number used by the rl78 bsp (that is, newlib), | |
366 | return the corresponding signal numbers. */ | |
367 | ||
368 | int | |
369 | rl78_signal_to_target (int sig) | |
370 | { | |
371 | switch (sig) | |
372 | { | |
373 | case 4: | |
a493e3e2 | 374 | return GDB_SIGNAL_ILL; |
9058f767 KB |
375 | |
376 | case 5: | |
a493e3e2 | 377 | return GDB_SIGNAL_TRAP; |
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378 | |
379 | case 10: | |
a493e3e2 | 380 | return GDB_SIGNAL_BUS; |
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381 | |
382 | case 11: | |
a493e3e2 | 383 | return GDB_SIGNAL_SEGV; |
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384 | |
385 | case 24: | |
a493e3e2 | 386 | return GDB_SIGNAL_XCPU; |
9058f767 KB |
387 | break; |
388 | ||
389 | case 2: | |
a493e3e2 | 390 | return GDB_SIGNAL_INT; |
9058f767 KB |
391 | |
392 | case 8: | |
a493e3e2 | 393 | return GDB_SIGNAL_FPE; |
9058f767 KB |
394 | break; |
395 | ||
396 | case 6: | |
a493e3e2 | 397 | return GDB_SIGNAL_ABRT; |
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398 | } |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | ||
404 | /* Take a step return code RC and set up the variables consulted by | |
405 | sim_stop_reason appropriately. */ | |
406 | ||
407 | void | |
408 | handle_step (int rc) | |
409 | { | |
410 | if (RL78_STEPPED (rc) || RL78_HIT_BREAK (rc)) | |
411 | { | |
412 | reason = sim_stopped; | |
a493e3e2 | 413 | siggnal = GDB_SIGNAL_TRAP; |
9058f767 KB |
414 | } |
415 | else if (RL78_STOPPED (rc)) | |
416 | { | |
417 | reason = sim_stopped; | |
418 | siggnal = rl78_signal_to_target (RL78_STOP_SIG (rc)); | |
419 | } | |
420 | else | |
421 | { | |
422 | assert (RL78_EXITED (rc)); | |
423 | reason = sim_exited; | |
424 | siggnal = RL78_EXIT_STATUS (rc); | |
425 | } | |
426 | } | |
427 | ||
428 | ||
429 | /* Resume execution after a stop. */ | |
430 | ||
431 | void | |
432 | sim_resume (SIM_DESC sd, int step, int sig_to_deliver) | |
433 | { | |
434 | int rc; | |
435 | ||
436 | check_desc (sd); | |
437 | ||
438 | if (sig_to_deliver != 0) | |
439 | { | |
440 | fprintf (stderr, | |
441 | "Warning: the rl78 minisim does not implement " | |
442 | "signal delivery yet.\n" "Resuming with no signal.\n"); | |
443 | } | |
444 | ||
445 | /* We don't clear 'stop' here, because then we would miss | |
446 | interrupts that arrived on the way here. Instead, we clear | |
447 | the flag in sim_stop_reason, after GDB has disabled the | |
448 | interrupt signal handler. */ | |
449 | for (;;) | |
450 | { | |
451 | if (stop) | |
452 | { | |
453 | stop = 0; | |
454 | reason = sim_stopped; | |
a493e3e2 | 455 | siggnal = GDB_SIGNAL_INT; |
9058f767 KB |
456 | break; |
457 | } | |
458 | ||
459 | if (hw_breakpoints[pc >> 3] | |
460 | && (hw_breakpoints[pc >> 3] & (1 << (pc & 0x7)))) | |
461 | { | |
462 | reason = sim_stopped; | |
a493e3e2 | 463 | siggnal = GDB_SIGNAL_TRAP; |
9058f767 KB |
464 | break; |
465 | } | |
466 | rc = setjmp (decode_jmp_buf); | |
467 | if (rc == 0) | |
468 | rc = decode_opcode (); | |
469 | ||
470 | if (!RL78_STEPPED (rc) || step) | |
471 | { | |
472 | handle_step (rc); | |
473 | break; | |
474 | } | |
475 | } | |
476 | } | |
477 | ||
478 | /* Stop the sim. */ | |
479 | ||
480 | int | |
481 | sim_stop (SIM_DESC sd) | |
482 | { | |
483 | stop = 1; | |
484 | ||
485 | return 1; | |
486 | } | |
487 | ||
488 | /* Fetch the stop reason and signal. */ | |
489 | ||
490 | void | |
491 | sim_stop_reason (SIM_DESC sd, enum sim_stop *reason_p, int *sigrc_p) | |
492 | { | |
493 | check_desc (sd); | |
494 | ||
495 | *reason_p = reason; | |
496 | *sigrc_p = siggnal; | |
497 | } | |
498 | ||
499 | /* Execute the sim-specific command associated with GDB's "sim ..." | |
500 | command. */ | |
501 | ||
502 | void | |
503 | sim_do_command (SIM_DESC sd, char *cmd) | |
504 | { | |
505 | char *args; | |
506 | ||
507 | check_desc (sd); | |
508 | ||
509 | if (cmd == NULL) | |
510 | { | |
511 | cmd = ""; | |
512 | args = ""; | |
513 | } | |
514 | else | |
515 | { | |
516 | char *p = cmd; | |
517 | ||
518 | /* Skip leading whitespace. */ | |
519 | while (isspace (*p)) | |
520 | p++; | |
521 | ||
522 | /* Find the extent of the command word. */ | |
523 | for (p = cmd; *p; p++) | |
524 | if (isspace (*p)) | |
525 | break; | |
526 | ||
527 | /* Null-terminate the command word, and record the start of any | |
528 | further arguments. */ | |
529 | if (*p) | |
530 | { | |
531 | *p = '\0'; | |
532 | args = p + 1; | |
533 | while (isspace (*args)) | |
534 | args++; | |
535 | } | |
536 | else | |
537 | args = p; | |
538 | } | |
539 | ||
540 | if (strcmp (cmd, "trace") == 0) | |
541 | { | |
542 | if (strcmp (args, "on") == 0) | |
543 | trace = 1; | |
544 | else if (strcmp (args, "off") == 0) | |
545 | trace = 0; | |
546 | else | |
547 | printf ("The 'sim trace' command expects 'on' or 'off' " | |
548 | "as an argument.\n"); | |
549 | } | |
550 | else if (strcmp (cmd, "verbose") == 0) | |
551 | { | |
552 | if (strcmp (args, "on") == 0) | |
553 | verbose = 1; | |
554 | else if (strcmp (args, "noisy") == 0) | |
555 | verbose = 2; | |
556 | else if (strcmp (args, "off") == 0) | |
557 | verbose = 0; | |
558 | else | |
559 | printf ("The 'sim verbose' command expects 'on', 'noisy', or 'off'" | |
560 | " as an argument.\n"); | |
561 | } | |
562 | else | |
563 | printf ("The 'sim' command expects either 'trace' or 'verbose'" | |
564 | " as a subcommand.\n"); | |
565 | } | |
566 | ||
567 | /* Stub for command completion. */ | |
568 | ||
569 | char ** | |
570 | sim_complete_command (SIM_DESC sd, char *text, char *word) | |
571 | { | |
572 | return NULL; | |
573 | } |