]>
Commit | Line | Data |
---|---|---|
9058f767 KB |
1 | /* gdb-if.c -- sim interface to GDB. |
2 | ||
3666a048 | 3 | Copyright (C) 2011-2021 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" | |
75070a4e | 30 | #include "libiberty.h" |
df68e12b MF |
31 | #include "sim/callback.h" |
32 | #include "sim/sim.h" | |
9058f767 KB |
33 | #include "gdb/signals.h" |
34 | #include "gdb/sim-rl78.h" | |
35 | ||
36 | #include "cpu.h" | |
37 | #include "mem.h" | |
38 | #include "load.h" | |
39 | #include "trace.h" | |
40 | ||
41 | /* Ideally, we'd wrap up all the minisim's data structures in an | |
42 | object and pass that around. However, neither GDB nor run needs | |
43 | that ability. | |
44 | ||
45 | So we just have one instance, that lives in global variables, and | |
46 | each time we open it, we re-initialize it. */ | |
47 | ||
48 | struct sim_state | |
49 | { | |
50 | const char *message; | |
51 | }; | |
52 | ||
53 | static struct sim_state the_minisim = { | |
54 | "This is the sole rl78 minisim instance." | |
55 | }; | |
56 | ||
57 | static int open; | |
58 | ||
9058f767 KB |
59 | static struct host_callback_struct *host_callbacks; |
60 | ||
61 | /* Open an instance of the sim. For this sim, only one instance | |
62 | is permitted. If sim_open() is called multiple times, the sim | |
63 | will be reset. */ | |
64 | ||
65 | SIM_DESC | |
66 | sim_open (SIM_OPEN_KIND kind, | |
67 | struct host_callback_struct *callback, | |
2e3d4f4d | 68 | struct bfd *abfd, char * const *argv) |
9058f767 KB |
69 | { |
70 | if (open) | |
71 | fprintf (stderr, "rl78 minisim: re-opened sim\n"); | |
72 | ||
73 | /* The 'run' interface doesn't use this function, so we don't care | |
74 | about KIND; it's always SIM_OPEN_DEBUG. */ | |
75 | if (kind != SIM_OPEN_DEBUG) | |
76 | fprintf (stderr, "rl78 minisim: sim_open KIND != SIM_OPEN_DEBUG: %d\n", | |
77 | kind); | |
78 | ||
79 | /* We use this for the load command. Perhaps someday, it'll be used | |
80 | for syscalls too. */ | |
81 | host_callbacks = callback; | |
82 | ||
83 | /* We don't expect any command-line arguments. */ | |
84 | ||
85 | init_cpu (); | |
86 | trace = 0; | |
87 | ||
88 | sim_disasm_init (abfd); | |
89 | open = 1; | |
0952813b DD |
90 | |
91 | while (argv != NULL && *argv != NULL) | |
92 | { | |
93 | if (strcmp (*argv, "g10") == 0 || strcmp (*argv, "-Mg10") == 0) | |
94 | { | |
95 | fprintf (stderr, "rl78 g10 support enabled.\n"); | |
96 | rl78_g10_mode = 1; | |
97 | g13_multiply = 0; | |
98 | g14_multiply = 0; | |
99 | mem_set_mirror (0, 0xf8000, 4096); | |
100 | break; | |
101 | } | |
102 | if (strcmp (*argv, "g13") == 0 || strcmp (*argv, "-Mg13") == 0) | |
103 | { | |
104 | fprintf (stderr, "rl78 g13 support enabled.\n"); | |
105 | rl78_g10_mode = 0; | |
106 | g13_multiply = 1; | |
107 | g14_multiply = 0; | |
108 | break; | |
109 | } | |
110 | if (strcmp (*argv, "g14") == 0 || strcmp (*argv, "-Mg14") == 0) | |
111 | { | |
112 | fprintf (stderr, "rl78 g14 support enabled.\n"); | |
113 | rl78_g10_mode = 0; | |
114 | g13_multiply = 0; | |
115 | g14_multiply = 1; | |
116 | break; | |
117 | } | |
118 | argv++; | |
119 | } | |
120 | ||
9058f767 KB |
121 | return &the_minisim; |
122 | } | |
123 | ||
124 | /* Verify the sim descriptor. Just print a message if the descriptor | |
125 | doesn't match. Nothing bad will happen if the descriptor doesn't | |
126 | match because all of the state is global. But if it doesn't | |
127 | match, that means there's a problem with the caller. */ | |
128 | ||
129 | static void | |
130 | check_desc (SIM_DESC sd) | |
131 | { | |
132 | if (sd != &the_minisim) | |
133 | fprintf (stderr, "rl78 minisim: desc != &the_minisim\n"); | |
134 | } | |
135 | ||
136 | /* Close the sim. */ | |
137 | ||
138 | void | |
139 | sim_close (SIM_DESC sd, int quitting) | |
140 | { | |
141 | check_desc (sd); | |
142 | ||
143 | /* Not much to do. At least free up our memory. */ | |
144 | init_mem (); | |
145 | ||
146 | open = 0; | |
147 | } | |
148 | ||
149 | /* Open the program to run; print a message if the program cannot | |
150 | be opened. */ | |
151 | ||
152 | static bfd * | |
153 | open_objfile (const char *filename) | |
154 | { | |
155 | bfd *prog = bfd_openr (filename, 0); | |
156 | ||
157 | if (!prog) | |
158 | { | |
159 | fprintf (stderr, "Can't read %s\n", filename); | |
160 | return 0; | |
161 | } | |
162 | ||
163 | if (!bfd_check_format (prog, bfd_object)) | |
164 | { | |
165 | fprintf (stderr, "%s not a rl78 program\n", filename); | |
166 | return 0; | |
167 | } | |
168 | ||
169 | return prog; | |
170 | } | |
171 | ||
172 | /* Load a program. */ | |
173 | ||
174 | SIM_RC | |
b2b255bd | 175 | sim_load (SIM_DESC sd, const char *prog, struct bfd *abfd, int from_tty) |
9058f767 KB |
176 | { |
177 | check_desc (sd); | |
178 | ||
179 | if (!abfd) | |
180 | abfd = open_objfile (prog); | |
181 | if (!abfd) | |
182 | return SIM_RC_FAIL; | |
183 | ||
184 | rl78_load (abfd, host_callbacks, "sim"); | |
185 | ||
186 | return SIM_RC_OK; | |
187 | } | |
188 | ||
189 | /* Create inferior. */ | |
190 | ||
191 | SIM_RC | |
2e3d4f4d MF |
192 | sim_create_inferior (SIM_DESC sd, struct bfd *abfd, |
193 | char * const *argv, char * const *env) | |
9058f767 KB |
194 | { |
195 | check_desc (sd); | |
196 | ||
197 | if (abfd) | |
198 | rl78_load (abfd, 0, "sim"); | |
199 | ||
200 | return SIM_RC_OK; | |
201 | } | |
202 | ||
203 | /* Read memory. */ | |
204 | ||
205 | int | |
206 | sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length) | |
207 | { | |
208 | check_desc (sd); | |
209 | ||
210 | if (mem >= MEM_SIZE) | |
211 | return 0; | |
212 | else if (mem + length > MEM_SIZE) | |
213 | length = MEM_SIZE - mem; | |
214 | ||
215 | mem_get_blk (mem, buf, length); | |
216 | return length; | |
217 | } | |
218 | ||
219 | /* Write memory. */ | |
220 | ||
221 | int | |
222 | sim_write (SIM_DESC sd, SIM_ADDR mem, const unsigned char *buf, int length) | |
223 | { | |
224 | check_desc (sd); | |
225 | ||
226 | if (mem >= MEM_SIZE) | |
227 | return 0; | |
228 | else if (mem + length > MEM_SIZE) | |
229 | length = MEM_SIZE - mem; | |
230 | ||
231 | mem_put_blk (mem, buf, length); | |
232 | return length; | |
233 | } | |
234 | ||
235 | /* Read the LENGTH bytes at BUF as an little-endian value. */ | |
236 | ||
237 | static SI | |
238 | get_le (unsigned char *buf, int length) | |
239 | { | |
240 | SI acc = 0; | |
241 | ||
242 | while (--length >= 0) | |
243 | acc = (acc << 8) + buf[length]; | |
244 | ||
245 | return acc; | |
246 | } | |
247 | ||
248 | /* Store VAL as a little-endian value in the LENGTH bytes at BUF. */ | |
249 | ||
250 | static void | |
251 | put_le (unsigned char *buf, int length, SI val) | |
252 | { | |
253 | int i; | |
254 | ||
255 | for (i = 0; i < length; i++) | |
256 | { | |
257 | buf[i] = val & 0xff; | |
258 | val >>= 8; | |
259 | } | |
260 | } | |
261 | ||
262 | /* Verify that REGNO is in the proper range. Return 0 if not and | |
263 | something non-zero if so. */ | |
264 | ||
265 | static int | |
266 | check_regno (enum sim_rl78_regnum regno) | |
267 | { | |
268 | return 0 <= regno && regno < sim_rl78_num_regs; | |
269 | } | |
270 | ||
271 | /* Return the size of the register REGNO. */ | |
272 | ||
273 | static size_t | |
274 | reg_size (enum sim_rl78_regnum regno) | |
275 | { | |
276 | size_t size; | |
277 | ||
278 | if (regno == sim_rl78_pc_regnum) | |
279 | size = 4; | |
280 | else | |
281 | size = 1; | |
282 | ||
283 | return size; | |
284 | } | |
285 | ||
286 | /* Return the register address associated with the register specified by | |
287 | REGNO. */ | |
288 | ||
289 | static unsigned long | |
290 | reg_addr (enum sim_rl78_regnum regno) | |
291 | { | |
292 | if (sim_rl78_bank0_r0_regnum <= regno | |
293 | && regno <= sim_rl78_bank0_r7_regnum) | |
294 | return 0xffef8 + (regno - sim_rl78_bank0_r0_regnum); | |
295 | else if (sim_rl78_bank1_r0_regnum <= regno | |
296 | && regno <= sim_rl78_bank1_r7_regnum) | |
297 | return 0xffef0 + (regno - sim_rl78_bank1_r0_regnum); | |
298 | else if (sim_rl78_bank2_r0_regnum <= regno | |
299 | && regno <= sim_rl78_bank2_r7_regnum) | |
300 | return 0xffee8 + (regno - sim_rl78_bank2_r0_regnum); | |
301 | else if (sim_rl78_bank3_r0_regnum <= regno | |
302 | && regno <= sim_rl78_bank3_r7_regnum) | |
303 | return 0xffee0 + (regno - sim_rl78_bank3_r0_regnum); | |
304 | else if (regno == sim_rl78_psw_regnum) | |
305 | return 0xffffa; | |
306 | else if (regno == sim_rl78_es_regnum) | |
307 | return 0xffffd; | |
308 | else if (regno == sim_rl78_cs_regnum) | |
309 | return 0xffffc; | |
310 | /* Note: We can't handle PC here because it's not memory mapped. */ | |
311 | else if (regno == sim_rl78_spl_regnum) | |
312 | return 0xffff8; | |
313 | else if (regno == sim_rl78_sph_regnum) | |
314 | return 0xffff9; | |
315 | else if (regno == sim_rl78_pmc_regnum) | |
316 | return 0xffffe; | |
317 | else if (regno == sim_rl78_mem_regnum) | |
318 | return 0xfffff; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | /* Fetch the contents of the register specified by REGNO, placing the | |
324 | contents in BUF. The length LENGTH must match the sim's internal | |
325 | notion of the register's size. */ | |
326 | ||
327 | int | |
328 | sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length) | |
329 | { | |
330 | size_t size; | |
331 | SI val; | |
332 | ||
333 | check_desc (sd); | |
334 | ||
335 | if (!check_regno (regno)) | |
336 | return 0; | |
337 | ||
338 | size = reg_size (regno); | |
339 | ||
340 | if (length != size) | |
341 | return 0; | |
342 | ||
343 | if (regno == sim_rl78_pc_regnum) | |
344 | val = pc; | |
345 | else | |
346 | val = memory[reg_addr (regno)]; | |
347 | ||
348 | put_le (buf, length, val); | |
349 | ||
350 | return size; | |
351 | } | |
352 | ||
353 | /* Store the value stored in BUF to the register REGNO. The length | |
354 | LENGTH must match the sim's internal notion of the register size. */ | |
355 | ||
356 | int | |
357 | sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length) | |
358 | { | |
359 | size_t size; | |
360 | SI val; | |
361 | ||
362 | check_desc (sd); | |
363 | ||
364 | if (!check_regno (regno)) | |
365 | return -1; | |
366 | ||
367 | size = reg_size (regno); | |
368 | ||
369 | if (length != size) | |
370 | return -1; | |
371 | ||
372 | val = get_le (buf, length); | |
373 | ||
374 | if (regno == sim_rl78_pc_regnum) | |
317cc67d KB |
375 | { |
376 | pc = val; | |
377 | ||
378 | /* The rl78 program counter is 20 bits wide. Ensure that GDB | |
379 | hasn't picked up any stray bits. This has occurred when performing | |
380 | a GDB "return" command in which the return address is obtained | |
381 | from a 32-bit container on the stack. */ | |
382 | assert ((pc & ~0x0fffff) == 0); | |
383 | } | |
9058f767 KB |
384 | else |
385 | memory[reg_addr (regno)] = val; | |
386 | return size; | |
387 | } | |
388 | ||
389 | /* Print out message associated with "info target". */ | |
390 | ||
391 | void | |
392 | sim_info (SIM_DESC sd, int verbose) | |
393 | { | |
394 | check_desc (sd); | |
395 | ||
396 | printf ("The rl78 minisim doesn't collect any statistics.\n"); | |
397 | } | |
398 | ||
399 | static volatile int stop; | |
400 | static enum sim_stop reason; | |
401 | int siggnal; | |
402 | ||
403 | ||
404 | /* Given a signal number used by the rl78 bsp (that is, newlib), | |
405 | return the corresponding signal numbers. */ | |
406 | ||
5318ba65 | 407 | static int |
9058f767 KB |
408 | rl78_signal_to_target (int sig) |
409 | { | |
410 | switch (sig) | |
411 | { | |
412 | case 4: | |
a493e3e2 | 413 | return GDB_SIGNAL_ILL; |
9058f767 KB |
414 | |
415 | case 5: | |
a493e3e2 | 416 | return GDB_SIGNAL_TRAP; |
9058f767 KB |
417 | |
418 | case 10: | |
a493e3e2 | 419 | return GDB_SIGNAL_BUS; |
9058f767 KB |
420 | |
421 | case 11: | |
a493e3e2 | 422 | return GDB_SIGNAL_SEGV; |
9058f767 KB |
423 | |
424 | case 24: | |
a493e3e2 | 425 | return GDB_SIGNAL_XCPU; |
9058f767 KB |
426 | break; |
427 | ||
428 | case 2: | |
a493e3e2 | 429 | return GDB_SIGNAL_INT; |
9058f767 KB |
430 | |
431 | case 8: | |
a493e3e2 | 432 | return GDB_SIGNAL_FPE; |
9058f767 KB |
433 | break; |
434 | ||
435 | case 6: | |
a493e3e2 | 436 | return GDB_SIGNAL_ABRT; |
9058f767 KB |
437 | } |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | ||
443 | /* Take a step return code RC and set up the variables consulted by | |
444 | sim_stop_reason appropriately. */ | |
445 | ||
5318ba65 | 446 | static void |
9058f767 KB |
447 | handle_step (int rc) |
448 | { | |
449 | if (RL78_STEPPED (rc) || RL78_HIT_BREAK (rc)) | |
450 | { | |
451 | reason = sim_stopped; | |
a493e3e2 | 452 | siggnal = GDB_SIGNAL_TRAP; |
9058f767 KB |
453 | } |
454 | else if (RL78_STOPPED (rc)) | |
455 | { | |
456 | reason = sim_stopped; | |
457 | siggnal = rl78_signal_to_target (RL78_STOP_SIG (rc)); | |
458 | } | |
459 | else | |
460 | { | |
461 | assert (RL78_EXITED (rc)); | |
462 | reason = sim_exited; | |
463 | siggnal = RL78_EXIT_STATUS (rc); | |
464 | } | |
465 | } | |
466 | ||
467 | ||
468 | /* Resume execution after a stop. */ | |
469 | ||
470 | void | |
471 | sim_resume (SIM_DESC sd, int step, int sig_to_deliver) | |
472 | { | |
473 | int rc; | |
474 | ||
475 | check_desc (sd); | |
476 | ||
477 | if (sig_to_deliver != 0) | |
478 | { | |
479 | fprintf (stderr, | |
480 | "Warning: the rl78 minisim does not implement " | |
481 | "signal delivery yet.\n" "Resuming with no signal.\n"); | |
482 | } | |
483 | ||
484 | /* We don't clear 'stop' here, because then we would miss | |
485 | interrupts that arrived on the way here. Instead, we clear | |
486 | the flag in sim_stop_reason, after GDB has disabled the | |
487 | interrupt signal handler. */ | |
488 | for (;;) | |
489 | { | |
490 | if (stop) | |
491 | { | |
492 | stop = 0; | |
493 | reason = sim_stopped; | |
a493e3e2 | 494 | siggnal = GDB_SIGNAL_INT; |
9058f767 KB |
495 | break; |
496 | } | |
497 | ||
9058f767 KB |
498 | rc = setjmp (decode_jmp_buf); |
499 | if (rc == 0) | |
500 | rc = decode_opcode (); | |
501 | ||
502 | if (!RL78_STEPPED (rc) || step) | |
503 | { | |
504 | handle_step (rc); | |
505 | break; | |
506 | } | |
507 | } | |
508 | } | |
509 | ||
510 | /* Stop the sim. */ | |
511 | ||
512 | int | |
513 | sim_stop (SIM_DESC sd) | |
514 | { | |
515 | stop = 1; | |
516 | ||
517 | return 1; | |
518 | } | |
519 | ||
520 | /* Fetch the stop reason and signal. */ | |
521 | ||
522 | void | |
523 | sim_stop_reason (SIM_DESC sd, enum sim_stop *reason_p, int *sigrc_p) | |
524 | { | |
525 | check_desc (sd); | |
526 | ||
527 | *reason_p = reason; | |
528 | *sigrc_p = siggnal; | |
529 | } | |
530 | ||
531 | /* Execute the sim-specific command associated with GDB's "sim ..." | |
532 | command. */ | |
533 | ||
534 | void | |
60d847df | 535 | sim_do_command (SIM_DESC sd, const char *cmd) |
9058f767 | 536 | { |
75070a4e MF |
537 | const char *arg; |
538 | char **argv = buildargv (cmd); | |
9058f767 KB |
539 | |
540 | check_desc (sd); | |
541 | ||
75070a4e MF |
542 | cmd = arg = ""; |
543 | if (argv != NULL) | |
9058f767 | 544 | { |
75070a4e MF |
545 | if (argv[0] != NULL) |
546 | cmd = argv[0]; | |
547 | if (argv[1] != NULL) | |
548 | arg = argv[1]; | |
9058f767 KB |
549 | } |
550 | ||
551 | if (strcmp (cmd, "trace") == 0) | |
552 | { | |
75070a4e | 553 | if (strcmp (arg, "on") == 0) |
9058f767 | 554 | trace = 1; |
75070a4e | 555 | else if (strcmp (arg, "off") == 0) |
9058f767 KB |
556 | trace = 0; |
557 | else | |
558 | printf ("The 'sim trace' command expects 'on' or 'off' " | |
559 | "as an argument.\n"); | |
560 | } | |
561 | else if (strcmp (cmd, "verbose") == 0) | |
562 | { | |
75070a4e | 563 | if (strcmp (arg, "on") == 0) |
9058f767 | 564 | verbose = 1; |
75070a4e | 565 | else if (strcmp (arg, "noisy") == 0) |
9058f767 | 566 | verbose = 2; |
75070a4e | 567 | else if (strcmp (arg, "off") == 0) |
9058f767 KB |
568 | verbose = 0; |
569 | else | |
570 | printf ("The 'sim verbose' command expects 'on', 'noisy', or 'off'" | |
571 | " as an argument.\n"); | |
572 | } | |
573 | else | |
574 | printf ("The 'sim' command expects either 'trace' or 'verbose'" | |
575 | " as a subcommand.\n"); | |
60d847df | 576 | |
75070a4e | 577 | freeargv (argv); |
9058f767 KB |
578 | } |
579 | ||
580 | /* Stub for command completion. */ | |
581 | ||
582 | char ** | |
3cb2ab1a | 583 | sim_complete_command (SIM_DESC sd, const char *text, const char *word) |
9058f767 KB |
584 | { |
585 | return NULL; | |
586 | } | |
7a9bd3b4 MF |
587 | |
588 | char * | |
589 | sim_memory_map (SIM_DESC sd) | |
590 | { | |
591 | return NULL; | |
592 | } |