Commit | Line | Data |
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2d46177c SS |
1 | /* Remote target communications for serial-line targets using SDS' protocol. |
2 | Copyright 1997 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | /* This interface was written by studying the behavior of the SDS | |
21 | monitor on an ADS 821/860 board, and by consulting the | |
22 | documentation of the monitor that is available on Motorola's web | |
23 | site. -sts 8/13/97 */ | |
24 | ||
25 | #include "defs.h" | |
26 | #include "gdb_string.h" | |
27 | #include <fcntl.h> | |
28 | #include "frame.h" | |
29 | #include "inferior.h" | |
30 | #include "bfd.h" | |
31 | #include "symfile.h" | |
32 | #include "target.h" | |
33 | #include "wait.h" | |
34 | #include "gdbcmd.h" | |
35 | #include "objfiles.h" | |
36 | #include "gdb-stabs.h" | |
37 | #include "gdbthread.h" | |
38 | ||
39 | #include "dcache.h" | |
40 | ||
41 | #ifdef USG | |
42 | #include <sys/types.h> | |
43 | #endif | |
44 | ||
45 | #include <signal.h> | |
46 | #include "serial.h" | |
47 | ||
48 | /* Declarations of local functions. */ | |
49 | ||
50 | static int sds_write_bytes PARAMS ((CORE_ADDR, char *, int)); | |
51 | ||
52 | static int sds_read_bytes PARAMS ((CORE_ADDR, char *, int)); | |
53 | ||
54 | static void sds_files_info PARAMS ((struct target_ops *ignore)); | |
55 | ||
56 | static int sds_xfer_memory PARAMS ((CORE_ADDR, char *, | |
57 | int, int, struct target_ops *)); | |
58 | ||
59 | static void sds_prepare_to_store PARAMS ((void)); | |
60 | ||
61 | static void sds_fetch_registers PARAMS ((int)); | |
62 | ||
63 | static void sds_resume PARAMS ((int, int, enum target_signal)); | |
64 | ||
65 | static int sds_start_remote PARAMS ((char *)); | |
66 | ||
67 | static void sds_open PARAMS ((char *, int)); | |
68 | ||
69 | static void sds_close PARAMS ((int)); | |
70 | ||
71 | static void sds_store_registers PARAMS ((int)); | |
72 | ||
73 | static void sds_mourn PARAMS ((void)); | |
74 | ||
75 | static void sds_restart PARAMS ((void)); | |
76 | ||
77 | static void sds_create_inferior PARAMS ((char *, char *, char **)); | |
78 | ||
79 | static int getmessage PARAMS ((unsigned char *, int)); | |
80 | ||
81 | static int putmessage PARAMS ((unsigned char *, int)); | |
82 | ||
83 | static int sds_send PARAMS ((unsigned char *, int)); | |
84 | ||
85 | static int readchar PARAMS ((int)); | |
86 | ||
87 | static int sds_wait PARAMS ((int, struct target_waitstatus *)); | |
88 | ||
89 | static void sds_kill PARAMS ((void)); | |
90 | ||
91 | static int tohex PARAMS ((int)); | |
92 | ||
93 | static int fromhex PARAMS ((int)); | |
94 | ||
95 | static void sds_detach PARAMS ((char *, int)); | |
96 | ||
97 | static void sds_interrupt PARAMS ((int)); | |
98 | ||
99 | static void sds_interrupt_twice PARAMS ((int)); | |
100 | ||
101 | static void interrupt_query PARAMS ((void)); | |
102 | ||
103 | static int read_frame PARAMS ((char *)); | |
104 | ||
105 | static int sds_insert_breakpoint PARAMS ((CORE_ADDR, char *)); | |
106 | ||
107 | static int sds_remove_breakpoint PARAMS ((CORE_ADDR, char *)); | |
108 | ||
109 | ||
110 | static struct target_ops sds_ops; /* Forward decl */ | |
111 | ||
112 | /* This was 5 seconds, which is a long time to sit and wait. | |
113 | Unless this is going though some terminal server or multiplexer or | |
114 | other form of hairy serial connection, I would think 2 seconds would | |
115 | be plenty. */ | |
116 | ||
117 | /* Changed to allow option to set timeout value. | |
118 | was static int sds_timeout = 2; */ | |
119 | static int sds_timeout = 2; | |
120 | ||
121 | /* This variable chooses whether to send a ^C or a break when the user | |
122 | requests program interruption. Although ^C is usually what remote | |
123 | systems expect, and that is the default here, sometimes a break is | |
124 | preferable instead. */ | |
125 | ||
126 | static int sds_break; | |
127 | ||
128 | /* Descriptor for I/O to remote machine. Initialize it to NULL so | |
129 | that sds_open knows that we don't have a file open when the program | |
130 | starts. */ | |
131 | ||
132 | static serial_t sds_desc = NULL; | |
133 | ||
134 | /* Having this larger than 400 causes us to be incompatible with m68k-stub.c | |
135 | and i386-stub.c. Normally, no one would notice because it only matters | |
136 | for writing large chunks of memory (e.g. in downloads). Also, this needs | |
137 | to be more than 400 if required to hold the registers (see below, where | |
138 | we round it up based on REGISTER_BYTES). */ | |
139 | #define PBUFSIZ 400 | |
140 | ||
141 | /* Maximum number of bytes to read/write at once. The value here | |
142 | is chosen to fill up a packet (the headers account for the 32). */ | |
143 | #define MAXBUFBYTES ((PBUFSIZ-32)/2) | |
144 | ||
145 | /* Round up PBUFSIZ to hold all the registers, at least. */ | |
146 | /* The blank line after the #if seems to be required to work around a | |
147 | bug in HP's PA compiler. */ | |
148 | #if REGISTER_BYTES > MAXBUFBYTES | |
149 | ||
150 | #undef PBUFSIZ | |
151 | #define PBUFSIZ (REGISTER_BYTES * 2 + 32) | |
152 | #endif | |
153 | ||
154 | static int next_msg_id; | |
155 | ||
156 | static int just_started; | |
157 | ||
158 | static int message_pending; | |
159 | ||
160 | \f | |
161 | /* Restart the remote side; this is an extended protocol operation. */ | |
162 | ||
163 | static void | |
164 | sds_restart () | |
165 | { | |
166 | } | |
167 | \f | |
168 | /* Clean up connection to a remote debugger. */ | |
169 | ||
170 | /* ARGSUSED */ | |
171 | static void | |
172 | sds_close (quitting) | |
173 | int quitting; | |
174 | { | |
175 | if (sds_desc) | |
176 | SERIAL_CLOSE (sds_desc); | |
177 | sds_desc = NULL; | |
178 | } | |
179 | ||
180 | /* Stub for catch_errors. */ | |
181 | ||
182 | static int | |
183 | sds_start_remote (dummy) | |
184 | char *dummy; | |
185 | { | |
186 | char c; | |
187 | unsigned char buf[200]; | |
188 | ||
189 | immediate_quit = 1; /* Allow user to interrupt it */ | |
190 | ||
191 | /* Ack any packet which the remote side has already sent. */ | |
192 | SERIAL_WRITE (sds_desc, "{#*\r\n", 5); | |
193 | SERIAL_WRITE (sds_desc, "{#}\r\n", 5); | |
194 | ||
195 | while ((c = readchar (1)) >= 0) | |
196 | printf_unfiltered ("%c"); | |
197 | printf_unfiltered ("\n"); | |
198 | ||
199 | next_msg_id = 251; | |
200 | ||
201 | buf[0] = 26; | |
202 | sds_send (buf, 1); | |
203 | ||
204 | buf[0] = 0; | |
205 | sds_send (buf, 1); | |
206 | ||
207 | immediate_quit = 0; | |
208 | ||
209 | start_remote (); /* Initialize gdb process mechanisms */ | |
210 | return 1; | |
211 | } | |
212 | ||
213 | /* Open a connection to a remote debugger. | |
214 | NAME is the filename used for communication. */ | |
215 | ||
216 | static DCACHE *sds_dcache; | |
217 | ||
218 | static void | |
219 | sds_open (name, from_tty) | |
220 | char *name; | |
221 | int from_tty; | |
222 | { | |
223 | if (name == 0) | |
224 | error ("To open a remote debug connection, you need to specify what serial\n\ | |
225 | device is attached to the remote system (e.g. /dev/ttya)."); | |
226 | ||
227 | target_preopen (from_tty); | |
228 | ||
229 | unpush_target (&sds_ops); | |
230 | ||
231 | sds_dcache = dcache_init (sds_read_bytes, sds_write_bytes); | |
232 | ||
233 | sds_desc = SERIAL_OPEN (name); | |
234 | if (!sds_desc) | |
235 | perror_with_name (name); | |
236 | ||
237 | if (baud_rate != -1) | |
238 | { | |
239 | if (SERIAL_SETBAUDRATE (sds_desc, baud_rate)) | |
240 | { | |
241 | SERIAL_CLOSE (sds_desc); | |
242 | perror_with_name (name); | |
243 | } | |
244 | } | |
245 | ||
246 | ||
247 | SERIAL_RAW (sds_desc); | |
248 | ||
249 | /* If there is something sitting in the buffer we might take it as a | |
250 | response to a command, which would be bad. */ | |
251 | SERIAL_FLUSH_INPUT (sds_desc); | |
252 | ||
253 | if (from_tty) | |
254 | { | |
255 | puts_filtered ("Remote debugging using "); | |
256 | puts_filtered (name); | |
257 | puts_filtered ("\n"); | |
258 | } | |
259 | push_target (&sds_ops); /* Switch to using remote target now */ | |
260 | ||
261 | /* Without this, some commands which require an active target (such | |
262 | as kill) won't work. This variable serves (at least) double duty | |
263 | as both the pid of the target process (if it has such), and as a | |
264 | flag indicating that a target is active. These functions should | |
265 | be split out into seperate variables, especially since GDB will | |
266 | someday have a notion of debugging several processes. */ | |
267 | ||
268 | inferior_pid = 42000; | |
269 | ||
270 | just_started = 1; | |
271 | ||
272 | /* Start the remote connection; if error (0), discard this target. | |
273 | In particular, if the user quits, be sure to discard it (we'd be | |
274 | in an inconsistent state otherwise). */ | |
275 | if (!catch_errors (sds_start_remote, (char *)0, | |
276 | "Couldn't establish connection to remote target\n", | |
277 | RETURN_MASK_ALL)) | |
278 | pop_target (); | |
279 | } | |
280 | ||
281 | /* This takes a program previously attached to and detaches it. After | |
282 | this is done, GDB can be used to debug some other program. We | |
283 | better not have left any breakpoints in the target program or it'll | |
284 | die when it hits one. */ | |
285 | ||
286 | static void | |
287 | sds_detach (args, from_tty) | |
288 | char *args; | |
289 | int from_tty; | |
290 | { | |
291 | char buf[PBUFSIZ]; | |
292 | ||
293 | if (args) | |
294 | error ("Argument given to \"detach\" when remotely debugging."); | |
295 | ||
296 | #if 0 | |
297 | /* Tell the remote target to detach. */ | |
298 | strcpy (buf, "D"); | |
299 | sds_send (buf, 1); | |
300 | #endif | |
301 | ||
302 | pop_target (); | |
303 | if (from_tty) | |
304 | puts_filtered ("Ending remote debugging.\n"); | |
305 | } | |
306 | ||
307 | /* Convert hex digit A to a number. */ | |
308 | ||
309 | static int | |
310 | fromhex (a) | |
311 | int a; | |
312 | { | |
313 | if (a >= '0' && a <= '9') | |
314 | return a - '0'; | |
315 | else if (a >= 'a' && a <= 'f') | |
316 | return a - 'a' + 10; | |
317 | else | |
318 | error ("Reply contains invalid hex digit %d", a); | |
319 | } | |
320 | ||
321 | /* Convert number NIB to a hex digit. */ | |
322 | ||
323 | static int | |
324 | tohex (nib) | |
325 | int nib; | |
326 | { | |
327 | if (nib < 10) | |
328 | return '0'+nib; | |
329 | else | |
330 | return 'a'+nib-10; | |
331 | } | |
332 | ||
333 | static int | |
334 | tob64 (inbuf, outbuf, len) | |
335 | unsigned char *inbuf; | |
336 | char *outbuf; | |
337 | int len; | |
338 | { | |
339 | int i, sum; | |
340 | ||
341 | if (len % 3 != 0) | |
342 | error ("bad length"); | |
343 | ||
344 | for (i = 0; i < len; i += 3) | |
345 | { | |
346 | /* Collect the next three bytes into a number. */ | |
347 | sum = ((long) *inbuf++) << 16; | |
348 | sum |= ((long) *inbuf++) << 8; | |
349 | sum |= ((long) *inbuf++); | |
350 | ||
351 | /* Spit out 4 6-bit encodings. */ | |
352 | *outbuf++ = ((sum >> 18) & 0x3f) + '0'; | |
353 | *outbuf++ = ((sum >> 12) & 0x3f) + '0'; | |
354 | *outbuf++ = ((sum >> 6) & 0x3f) + '0'; | |
355 | *outbuf++ = (sum & 0x3f) + '0'; | |
356 | } | |
357 | } | |
358 | ||
359 | static int | |
360 | fromb64 (inbuf, outbuf, len) | |
361 | char *inbuf, *outbuf; | |
362 | int len; | |
363 | { | |
364 | int i, sum; | |
365 | ||
366 | if (len % 4 != 0) | |
367 | error ("bad length"); | |
368 | ||
369 | for (i = 0; i < len; i += 4) | |
370 | { | |
371 | /* Collect 4 6-bit digits. */ | |
372 | sum = (*inbuf++ - '0') << 18; | |
373 | sum |= (*inbuf++ - '0') << 12; | |
374 | sum |= (*inbuf++ - '0') << 6; | |
375 | sum |= (*inbuf++ - '0'); | |
376 | ||
377 | /* Now take the resulting 24-bit number and get three bytes out | |
378 | of it. */ | |
379 | *outbuf++ = (sum >> 16) & 0xff; | |
380 | *outbuf++ = (sum >> 8) & 0xff; | |
381 | *outbuf++ = sum & 0xff; | |
382 | } | |
383 | ||
384 | return (len / 4) * 3; | |
385 | } | |
386 | ||
387 | \f | |
388 | /* Tell the remote machine to resume. */ | |
389 | ||
390 | static enum target_signal last_sent_signal = TARGET_SIGNAL_0; | |
391 | int last_sent_step; | |
392 | ||
393 | static void | |
394 | sds_resume (pid, step, siggnal) | |
395 | int pid, step; | |
396 | enum target_signal siggnal; | |
397 | { | |
398 | unsigned char buf[PBUFSIZ]; | |
399 | ||
400 | dcache_flush (sds_dcache); | |
401 | ||
402 | last_sent_signal = siggnal; | |
403 | last_sent_step = step; | |
404 | ||
405 | buf[0] = (step ? 21 : 20); | |
406 | buf[1] = 0; /* (should be signal?) */ | |
407 | ||
408 | sds_send (buf, 2); | |
409 | } | |
410 | \f | |
411 | /* Send ^C to target to halt it. Target will respond, and send us a | |
412 | packet. */ | |
413 | ||
414 | static void | |
415 | sds_interrupt (signo) | |
416 | int signo; | |
417 | { | |
418 | /* If this doesn't work, try more severe steps. */ | |
419 | signal (signo, sds_interrupt_twice); | |
420 | ||
421 | if (remote_debug) | |
422 | printf_unfiltered ("sds_interrupt called\n"); | |
423 | ||
424 | /* Send a break or a ^C, depending on user preference. */ | |
425 | if (sds_break) | |
426 | SERIAL_SEND_BREAK (sds_desc); | |
427 | else | |
428 | SERIAL_WRITE (sds_desc, "\003", 1); | |
429 | } | |
430 | ||
431 | static void (*ofunc)(); | |
432 | ||
433 | /* The user typed ^C twice. */ | |
434 | static void | |
435 | sds_interrupt_twice (signo) | |
436 | int signo; | |
437 | { | |
438 | signal (signo, ofunc); | |
439 | ||
440 | interrupt_query (); | |
441 | ||
442 | signal (signo, sds_interrupt); | |
443 | } | |
444 | ||
445 | /* Ask the user what to do when an interrupt is received. */ | |
446 | ||
447 | static void | |
448 | interrupt_query () | |
449 | { | |
450 | target_terminal_ours (); | |
451 | ||
452 | if (query ("Interrupted while waiting for the program.\n\ | |
453 | Give up (and stop debugging it)? ")) | |
454 | { | |
455 | target_mourn_inferior (); | |
456 | return_to_top_level (RETURN_QUIT); | |
457 | } | |
458 | ||
459 | target_terminal_inferior (); | |
460 | } | |
461 | ||
462 | /* If nonzero, ignore the next kill. */ | |
463 | int kill_kludge; | |
464 | ||
465 | /* Wait until the remote machine stops, then return, storing status in | |
466 | STATUS just as `wait' would. Returns "pid" (though it's not clear | |
467 | what, if anything, that means in the case of this target). */ | |
468 | ||
469 | static int | |
470 | sds_wait (pid, status) | |
471 | int pid; | |
472 | struct target_waitstatus *status; | |
473 | { | |
474 | unsigned char buf[PBUFSIZ]; | |
475 | int retlen; | |
476 | ||
477 | status->kind = TARGET_WAITKIND_EXITED; | |
478 | status->value.integer = 0; | |
479 | ||
480 | ofunc = (void (*)()) signal (SIGINT, sds_interrupt); | |
481 | ||
482 | signal (SIGINT, ofunc); | |
483 | ||
484 | if (just_started) | |
485 | { | |
486 | just_started = 0; | |
487 | status->kind = TARGET_WAITKIND_STOPPED; | |
488 | return inferior_pid; | |
489 | } | |
490 | ||
491 | while (1) | |
492 | { | |
493 | getmessage (buf, 1); | |
494 | ||
495 | if (message_pending) | |
496 | { | |
497 | buf[0] = 26; | |
498 | retlen = sds_send (buf, 1); | |
499 | message_pending = 0; | |
500 | status->kind = TARGET_WAITKIND_STOPPED; | |
501 | goto got_status; | |
502 | } | |
503 | } | |
504 | got_status: | |
505 | return inferior_pid; | |
506 | } | |
507 | ||
508 | /* Number of bytes of registers this stub implements. */ | |
509 | static int register_bytes_found; | |
510 | ||
511 | /* Read the remote registers into the block REGS. */ | |
512 | /* Currently we just read all the registers, so we don't use regno. */ | |
513 | ||
514 | /* ARGSUSED */ | |
515 | static void | |
516 | sds_fetch_registers (regno) | |
517 | int regno; | |
518 | { | |
519 | unsigned char buf[PBUFSIZ]; | |
520 | int i, len; | |
521 | char *p; | |
522 | char regs[REGISTER_BYTES]; | |
523 | ||
524 | /* Unimplemented registers read as all bits zero. */ | |
525 | memset (regs, 0, REGISTER_BYTES); | |
526 | ||
527 | buf[0] = 18; | |
528 | buf[1] = 2; | |
529 | buf[2] = 0; | |
530 | len = sds_send (buf, 3); | |
531 | ||
532 | /* Reply describes registers byte by byte. Suck them all up, then | |
533 | supply them to the register cacheing/storage mechanism. */ | |
534 | ||
535 | for (i = 0; i < len; i++) | |
536 | regs[i] = buf[i]; | |
537 | ||
538 | buf[0] = 18; | |
539 | buf[1] = 1; | |
540 | buf[2] = 0; | |
541 | len = sds_send (buf, 3); | |
542 | ||
543 | for (i = 0; i < 4 * 6; i++) | |
544 | { | |
545 | regs[i + 4 * 32 + 8 * 32] = buf[i]; | |
546 | } | |
547 | ||
548 | /* (should warn about reply too short) */ | |
549 | ||
550 | supply_them: | |
551 | for (i = 0; i < NUM_REGS; i++) | |
552 | supply_register (i, ®s[REGISTER_BYTE(i)]); | |
553 | } | |
554 | ||
555 | /* Prepare to store registers. Since we may send them all (using a | |
556 | 'G' request), we have to read out the ones we don't want to change | |
557 | first. */ | |
558 | ||
559 | static void | |
560 | sds_prepare_to_store () | |
561 | { | |
562 | /* Make sure the entire registers array is valid. */ | |
563 | read_register_bytes (0, (char *)NULL, REGISTER_BYTES); | |
564 | } | |
565 | ||
566 | /* Store register REGNO, or all registers if REGNO == -1, from the contents | |
567 | of REGISTERS. FIXME: ignores errors. */ | |
568 | ||
569 | static void | |
570 | sds_store_registers (regno) | |
571 | int regno; | |
572 | { | |
573 | unsigned char buf[PBUFSIZ]; | |
574 | int i; | |
575 | char *p; | |
576 | ||
577 | buf[0] = 19; | |
578 | buf[1] = 2; | |
579 | buf[2] = 0; | |
580 | buf[3] = 0; | |
581 | ||
582 | p = buf + 4; | |
583 | ||
584 | for (i = 0; i < 4 * 32; i++) | |
585 | p[i] = registers[i]; | |
586 | ||
587 | sds_send (buf, 4 + 4 * 32); | |
588 | ||
589 | buf[0] = 19; | |
590 | buf[1] = 1; | |
591 | buf[2] = 0; | |
592 | buf[3] = 0; | |
593 | ||
594 | p = buf + 4; | |
595 | ||
596 | for (i = 0; i < 4 * 10; i++) | |
597 | p[i] = registers[i]; | |
598 | ||
599 | sds_send (buf, 4 + 4 * 10); | |
600 | } | |
601 | ||
602 | /* | |
603 | Use of the data cache *used* to be disabled because it loses for looking at | |
604 | and changing hardware I/O ports and the like. Accepting `volatile' | |
605 | would perhaps be one way to fix it. Another idea would be to use the | |
606 | executable file for the text segment (for all SEC_CODE sections? | |
607 | For all SEC_READONLY sections?). This has problems if you want to | |
608 | actually see what the memory contains (e.g. self-modifying code, | |
609 | clobbered memory, user downloaded the wrong thing). | |
610 | ||
611 | Because it speeds so much up, it's now enabled, if you're playing | |
612 | with registers you turn it of (set remotecache 0) | |
613 | */ | |
614 | ||
615 | /* Read a word from remote address ADDR and return it. | |
616 | This goes through the data cache. */ | |
617 | ||
618 | #if 0 /* unused? */ | |
619 | static int | |
620 | sds_fetch_word (addr) | |
621 | CORE_ADDR addr; | |
622 | { | |
623 | return dcache_fetch (sds_dcache, addr); | |
624 | } | |
625 | ||
626 | /* Write a word WORD into remote address ADDR. | |
627 | This goes through the data cache. */ | |
628 | ||
629 | static void | |
630 | sds_store_word (addr, word) | |
631 | CORE_ADDR addr; | |
632 | int word; | |
633 | { | |
634 | dcache_poke (sds_dcache, addr, word); | |
635 | } | |
636 | #endif /* 0 (unused?) */ | |
637 | ||
638 | \f | |
639 | /* Write memory data directly to the remote machine. This does not | |
640 | inform the data cache; the data cache uses this. MEMADDR is the | |
641 | address in the remote memory space. MYADDR is the address of the | |
642 | buffer in our space. LEN is the number of bytes. | |
643 | ||
644 | Returns number of bytes transferred, or 0 for error. */ | |
645 | ||
646 | static int | |
647 | sds_write_bytes (memaddr, myaddr, len) | |
648 | CORE_ADDR memaddr; | |
649 | char *myaddr; | |
650 | int len; | |
651 | { | |
652 | int max_buf_size; /* Max size of packet output buffer */ | |
653 | int origlen; | |
654 | unsigned char buf[PBUFSIZ]; | |
655 | int todo; | |
656 | int i; | |
657 | ||
658 | /* Chop the transfer down if necessary */ | |
659 | ||
660 | max_buf_size = 150; | |
661 | ||
662 | origlen = len; | |
663 | while (len > 0) | |
664 | { | |
665 | todo = min (len, max_buf_size); | |
666 | ||
667 | buf[0] = 13; | |
668 | buf[1] = 0; | |
669 | buf[2] = (int) (memaddr >> 24) & 0xff; | |
670 | buf[3] = (int) (memaddr >> 16) & 0xff; | |
671 | buf[4] = (int) (memaddr >> 8) & 0xff; | |
672 | buf[5] = (int) (memaddr ) & 0xff; | |
673 | buf[6] = 1; | |
674 | buf[7] = 0; | |
675 | ||
676 | for (i = 0; i < todo; i++) | |
677 | buf[i + 8] = myaddr[i]; | |
678 | ||
679 | sds_send (buf, 8 + todo); | |
680 | ||
681 | /* (should look at result) */ | |
682 | ||
683 | myaddr += todo; | |
684 | memaddr += todo; | |
685 | len -= todo; | |
686 | } | |
687 | return origlen; | |
688 | } | |
689 | ||
690 | /* Read memory data directly from the remote machine. This does not | |
691 | use the data cache; the data cache uses this. MEMADDR is the | |
692 | address in the remote memory space. MYADDR is the address of the | |
693 | buffer in our space. LEN is the number of bytes. | |
694 | ||
695 | Returns number of bytes transferred, or 0 for error. */ | |
696 | ||
697 | static int | |
698 | sds_read_bytes (memaddr, myaddr, len) | |
699 | CORE_ADDR memaddr; | |
700 | char *myaddr; | |
701 | int len; | |
702 | { | |
703 | int max_buf_size; /* Max size of packet output buffer */ | |
704 | int origlen, retlen; | |
705 | unsigned char buf[PBUFSIZ]; | |
706 | int todo; | |
707 | int i; | |
708 | ||
709 | /* Chop the transfer down if necessary */ | |
710 | ||
711 | max_buf_size = 150; | |
712 | ||
713 | origlen = len; | |
714 | while (len > 0) | |
715 | { | |
716 | todo = min (len, max_buf_size); | |
717 | ||
718 | buf[0] = 12; | |
719 | buf[1] = 0; | |
720 | buf[2] = (int) (memaddr >> 24) & 0xff; | |
721 | buf[3] = (int) (memaddr >> 16) & 0xff; | |
722 | buf[4] = (int) (memaddr >> 8) & 0xff; | |
723 | buf[5] = (int) (memaddr ) & 0xff; | |
724 | buf[6] = (int) (todo >> 8) & 0xff; | |
725 | buf[7] = (int) (todo ) & 0xff; | |
726 | buf[8] = 1; | |
727 | ||
728 | retlen = sds_send (buf, 9); | |
729 | ||
730 | if (retlen - 2 != todo) | |
731 | { | |
732 | return 0; | |
733 | } | |
734 | ||
735 | /* Reply describes memory byte by byte. */ | |
736 | ||
737 | for (i = 0; i < todo; i++) | |
738 | myaddr[i] = buf[i + 2]; | |
739 | ||
740 | myaddr += todo; | |
741 | memaddr += todo; | |
742 | len -= todo; | |
743 | } | |
744 | ||
745 | return origlen; | |
746 | } | |
747 | \f | |
748 | /* Read or write LEN bytes from inferior memory at MEMADDR, | |
749 | transferring to or from debugger address MYADDR. Write to inferior | |
750 | if SHOULD_WRITE is nonzero. Returns length of data written or | |
751 | read; 0 for error. */ | |
752 | ||
753 | /* ARGSUSED */ | |
754 | static int | |
755 | sds_xfer_memory(memaddr, myaddr, len, should_write, target) | |
756 | CORE_ADDR memaddr; | |
757 | char *myaddr; | |
758 | int len; | |
759 | int should_write; | |
760 | struct target_ops *target; /* ignored */ | |
761 | { | |
762 | return dcache_xfer_memory (sds_dcache, memaddr, myaddr, len, should_write); | |
763 | } | |
764 | ||
765 | \f | |
766 | static void | |
767 | sds_files_info (ignore) | |
768 | struct target_ops *ignore; | |
769 | { | |
770 | puts_filtered ("Debugging a target over a serial line.\n"); | |
771 | } | |
772 | \f | |
773 | /* Stuff for dealing with the packets which are part of this protocol. | |
774 | See comment at top of file for details. */ | |
775 | ||
776 | /* Read a single character from the remote end, masking it down to 7 bits. */ | |
777 | ||
778 | static int | |
779 | readchar (timeout) | |
780 | int timeout; | |
781 | { | |
782 | int ch; | |
783 | ||
784 | ch = SERIAL_READCHAR (sds_desc, timeout); | |
785 | ||
786 | if (remote_debug > 1 && ch >= 0) | |
787 | printf_unfiltered("%c(%x)", ch, ch); | |
788 | ||
789 | switch (ch) | |
790 | { | |
791 | case SERIAL_EOF: | |
792 | error ("Remote connection closed"); | |
793 | case SERIAL_ERROR: | |
794 | perror_with_name ("Remote communication error"); | |
795 | case SERIAL_TIMEOUT: | |
796 | return ch; | |
797 | default: | |
798 | return ch & 0x7f; | |
799 | } | |
800 | } | |
801 | ||
802 | static int | |
803 | compute_checksum (csum, buf, len) | |
804 | int csum, len; | |
805 | char *buf; | |
806 | { | |
807 | int i; | |
808 | ||
809 | for (i = 0; i < len; ++i) | |
810 | csum += (unsigned char) buf[i]; | |
811 | ||
812 | csum %= 253; | |
813 | return csum; | |
814 | } | |
815 | ||
816 | /* Send the command in BUF to the remote machine, and read the reply | |
817 | into BUF also. */ | |
818 | ||
819 | static int | |
820 | sds_send (buf, len) | |
821 | unsigned char *buf; | |
822 | int len; | |
823 | { | |
824 | putmessage (buf, len); | |
825 | ||
826 | return getmessage (buf, 0); | |
827 | } | |
828 | ||
829 | /* Send a message to the remote machine. */ | |
830 | ||
831 | static int | |
832 | putmessage (buf, len) | |
833 | unsigned char *buf; | |
834 | int len; | |
835 | { | |
836 | int i; | |
837 | unsigned char csum = 0; | |
838 | char buf2[PBUFSIZ], buf3[PBUFSIZ]; | |
839 | unsigned char header[3]; | |
840 | int ch; | |
841 | int tcount = 0; | |
842 | char *p; | |
843 | ||
844 | /* Copy the packet into buffer BUF2, encapsulating it | |
845 | and giving it a checksum. */ | |
846 | ||
847 | if (len > (int) sizeof (buf2) - 5) /* Prosanity check */ | |
848 | abort(); | |
849 | ||
850 | if (remote_debug) | |
851 | { | |
852 | fprintf_unfiltered (gdb_stderr, "Message to send: \""); | |
853 | for (i = 0; i < len; ++i) | |
854 | fprintf_unfiltered (gdb_stderr, "%02x", buf[i]); | |
855 | fprintf_unfiltered (gdb_stderr, "\"\n"); | |
856 | } | |
857 | ||
858 | p = buf2; | |
859 | *p++ = '$'; | |
860 | ||
861 | header[1] = next_msg_id; | |
862 | ||
863 | if (len % 3 != 0) | |
864 | { | |
865 | buf[len] = '\0'; | |
866 | buf[len+1] = '\0'; | |
867 | } | |
868 | ||
869 | len = ((len + 2) / 3) * 3; | |
870 | ||
871 | header[2] = len; | |
872 | ||
873 | csum = compute_checksum (csum, buf, len); | |
874 | csum = compute_checksum (csum, header+1, 2); | |
875 | ||
876 | header[0] = csum; | |
877 | ||
878 | tob64 (header, p, 3); | |
879 | p += 4; | |
880 | tob64 (buf, buf3, len); | |
881 | ||
882 | for (i = 0; i < (len / 3) * 4; i++) | |
883 | { | |
884 | *p++ = buf3[i]; | |
885 | } | |
886 | *p++ = '\r'; | |
887 | *p++ = '\n'; | |
888 | ||
889 | next_msg_id = (next_msg_id + 3) % 245; | |
890 | ||
891 | /* Send it over and over until we get a positive ack. */ | |
892 | ||
893 | while (1) | |
894 | { | |
895 | int started_error_output = 0; | |
896 | ||
897 | if (remote_debug) | |
898 | { | |
899 | *p = '\0'; | |
900 | printf_unfiltered ("Sending encoded: \"%s\"", buf2); | |
901 | printf_unfiltered (" (Checksum %d, id %d, length %d)\n", | |
902 | header[0], header[1], header[2]); | |
903 | gdb_flush (gdb_stdout); | |
904 | } | |
905 | if (SERIAL_WRITE (sds_desc, buf2, p - buf2)) | |
906 | perror_with_name ("putmessage: write failed"); | |
907 | ||
908 | return 1; | |
909 | ||
910 | } | |
911 | ||
912 | } | |
913 | ||
914 | /* Come here after finding the start of the frame. Collect the rest | |
915 | into BUF. Returns 0 on any error, 1 on success. */ | |
916 | ||
917 | static int | |
918 | read_frame (buf) | |
919 | char *buf; | |
920 | { | |
921 | char *bp; | |
922 | int c; | |
923 | ||
924 | bp = buf; | |
925 | ||
926 | while (1) | |
927 | { | |
928 | c = readchar (sds_timeout); | |
929 | ||
930 | switch (c) | |
931 | { | |
932 | case SERIAL_TIMEOUT: | |
933 | if (remote_debug) | |
934 | puts_filtered ("Timeout in mid-message, retrying\n"); | |
935 | return 0; | |
936 | case '$': | |
937 | if (remote_debug) | |
938 | puts_filtered ("Saw new packet start in middle of old one\n"); | |
939 | return 0; /* Start a new packet, count retries */ | |
940 | case '\r': | |
941 | break; | |
942 | ||
943 | case '\n': | |
944 | { | |
945 | *bp = '\000'; | |
946 | if (remote_debug) | |
947 | printf_filtered ("Received encoded: \"%s\"\n", buf); | |
948 | return 1; | |
949 | } | |
950 | ||
951 | default: | |
952 | if (bp < buf + PBUFSIZ - 1) | |
953 | { | |
954 | *bp++ = c; | |
955 | continue; | |
956 | } | |
957 | ||
958 | *bp = '\0'; | |
959 | puts_filtered ("Message too long: "); | |
960 | puts_filtered (buf); | |
961 | puts_filtered ("\n"); | |
962 | ||
963 | return 0; | |
964 | } | |
965 | } | |
966 | } | |
967 | ||
968 | /* Read a packet from the remote machine, with error checking, | |
969 | and store it in BUF. BUF is expected to be of size PBUFSIZ. | |
970 | If FOREVER, wait forever rather than timing out; this is used | |
971 | while the target is executing user code. */ | |
972 | ||
973 | static int | |
974 | getmessage (buf, forever) | |
975 | unsigned char *buf; | |
976 | int forever; | |
977 | { | |
978 | int c, c2, c3; | |
979 | int tries; | |
980 | int timeout; | |
981 | int val, i, len, csum; | |
982 | unsigned char header[3]; | |
983 | unsigned char inbuf[500]; | |
984 | ||
985 | strcpy (buf, "timeout"); | |
986 | ||
987 | if (forever) | |
988 | { | |
989 | #ifdef MAINTENANCE_CMDS | |
990 | timeout = watchdog > 0 ? watchdog : -1; | |
991 | #else | |
992 | timeout = -1; | |
993 | #endif | |
994 | } | |
995 | ||
996 | else | |
997 | timeout = sds_timeout; | |
998 | ||
999 | #define MAX_TRIES 3 | |
1000 | ||
1001 | for (tries = 1; tries <= MAX_TRIES; tries++) | |
1002 | { | |
1003 | /* This can loop forever if the remote side sends us characters | |
1004 | continuously, but if it pauses, we'll get a zero from readchar | |
1005 | because of timeout. Then we'll count that as a retry. */ | |
1006 | ||
1007 | /* Note that we will only wait forever prior to the start of a packet. | |
1008 | After that, we expect characters to arrive at a brisk pace. They | |
1009 | should show up within sds_timeout intervals. */ | |
1010 | ||
1011 | do | |
1012 | { | |
1013 | c = readchar (timeout); | |
1014 | ||
1015 | if (c == SERIAL_TIMEOUT) | |
1016 | { | |
1017 | #ifdef MAINTENANCE_CMDS | |
1018 | if (forever) /* Watchdog went off. Kill the target. */ | |
1019 | { | |
1020 | target_mourn_inferior (); | |
1021 | error ("Watchdog has expired. Target detached.\n"); | |
1022 | } | |
1023 | #endif | |
1024 | if (remote_debug) | |
1025 | puts_filtered ("Timed out.\n"); | |
1026 | goto retry; | |
1027 | } | |
1028 | } | |
1029 | while (c != '$' && c != '{'); | |
1030 | ||
1031 | /* We might have seen a "trigraph", a sequence of three characters | |
1032 | that indicate various sorts of communication state. */ | |
1033 | ||
1034 | if (c == '{') | |
1035 | { | |
1036 | /* Read the other two chars of the trigraph. */ | |
1037 | c2 = readchar (timeout); | |
1038 | c3 = readchar (timeout); | |
1039 | if (remote_debug) | |
1040 | fprintf_unfiltered (gdb_stderr, "Trigraph %c%c%c received\n", | |
1041 | c, c2, c3); | |
1042 | if (c3 == '+') | |
1043 | { | |
1044 | message_pending = 1; | |
1045 | return; | |
1046 | } | |
1047 | continue; | |
1048 | } | |
1049 | ||
1050 | val = read_frame (inbuf); | |
1051 | ||
1052 | if (val == 1) | |
1053 | { | |
1054 | fromb64 (inbuf, header, 4); | |
1055 | /* (should check out other bits) */ | |
1056 | fromb64 (inbuf + 4, buf, strlen (inbuf) - 4); | |
1057 | ||
1058 | len = header[2]; | |
1059 | ||
1060 | csum = 0; | |
1061 | csum = compute_checksum (csum, buf, len); | |
1062 | csum = compute_checksum (csum, header + 1, 2); | |
1063 | ||
1064 | if (csum != header[0]) | |
1065 | fprintf_unfiltered (gdb_stderr, | |
1066 | "Checksum mismatch: computed %d, received %d\n", | |
1067 | csum, header[0]); | |
1068 | ||
1069 | if (header[2] == 0xff) | |
1070 | fprintf_unfiltered (gdb_stderr, "Requesting resend...\n"); | |
1071 | ||
1072 | if (remote_debug) | |
1073 | { | |
1074 | fprintf_unfiltered (gdb_stderr, | |
1075 | "... (Got checksum %d, id %d, length %d)\n", | |
1076 | header[0], header[1], header[2]); | |
1077 | fprintf_unfiltered (gdb_stderr, "Message received: \""); | |
1078 | for (i = 0; i < len; ++i) | |
1079 | { | |
1080 | fprintf_unfiltered (gdb_stderr, "%02x", (unsigned char) buf[i]); | |
1081 | } | |
1082 | fprintf_unfiltered (gdb_stderr, "\"\n"); | |
1083 | } | |
1084 | ||
1085 | /* no ack required? */ | |
1086 | return len; | |
1087 | } | |
1088 | ||
1089 | /* Try the whole thing again. */ | |
1090 | retry: | |
1091 | /* need to do something here */ | |
1092 | } | |
1093 | ||
1094 | /* We have tried hard enough, and just can't receive the packet. Give up. */ | |
1095 | ||
1096 | printf_unfiltered ("Ignoring packet error, continuing...\n"); | |
1097 | } | |
1098 | \f | |
1099 | static void | |
1100 | sds_kill () | |
1101 | { | |
1102 | /* For some mysterious reason, wait_for_inferior calls kill instead of | |
1103 | mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */ | |
1104 | if (kill_kludge) | |
1105 | { | |
1106 | kill_kludge = 0; | |
1107 | target_mourn_inferior (); | |
1108 | return; | |
1109 | } | |
1110 | ||
1111 | #if 0 /* fix to use 1-arg fn */ | |
1112 | /* Use catch_errors so the user can quit from gdb even when we aren't on | |
1113 | speaking terms with the remote system. */ | |
1114 | catch_errors (putmessage, "k", "", RETURN_MASK_ERROR); | |
1115 | #endif | |
1116 | ||
1117 | /* Don't wait for it to die. I'm not really sure it matters whether | |
1118 | we do or not. For the existing stubs, kill is a noop. */ | |
1119 | target_mourn_inferior (); | |
1120 | } | |
1121 | ||
1122 | static void | |
1123 | sds_mourn () | |
1124 | { | |
1125 | unpush_target (&sds_ops); | |
1126 | generic_mourn_inferior (); | |
1127 | } | |
1128 | ||
1129 | static void | |
1130 | sds_create_inferior (exec_file, args, env) | |
1131 | char *exec_file; | |
1132 | char *args; | |
1133 | char **env; | |
1134 | { | |
1135 | /* Rip out the breakpoints; we'll reinsert them after restarting | |
1136 | the remote server. */ | |
1137 | remove_breakpoints (); | |
1138 | ||
1139 | /* Now restart the remote server. */ | |
1140 | sds_restart (); | |
1141 | ||
1142 | /* Now put the breakpoints back in. This way we're safe if the | |
1143 | restart function works via a unix fork on the remote side. */ | |
1144 | insert_breakpoints (); | |
1145 | ||
1146 | /* Clean up from the last time we were running. */ | |
1147 | clear_proceed_status (); | |
1148 | ||
1149 | /* Let the remote process run. */ | |
1150 | proceed (-1, TARGET_SIGNAL_0, 0); | |
1151 | } | |
1152 | ||
1153 | \f | |
1154 | /* The SDS monitor has commands for breakpoint insertion, although it | |
1155 | it doesn't actually manage the breakpoints, it just returns the | |
1156 | replaced instruction back to the debugger. */ | |
1157 | ||
1158 | static int | |
1159 | sds_insert_breakpoint (addr, contents_cache) | |
1160 | CORE_ADDR addr; | |
1161 | char *contents_cache; | |
1162 | { | |
1163 | int retlen; | |
1164 | unsigned char buf[PBUFSIZ]; | |
1165 | ||
1166 | buf[0] = 16; | |
1167 | buf[1] = 0; | |
1168 | ||
1169 | retlen = sds_send (buf, 7); | |
1170 | } | |
1171 | ||
1172 | static int | |
1173 | sds_remove_breakpoint (addr, contents_cache) | |
1174 | CORE_ADDR addr; | |
1175 | char *contents_cache; | |
1176 | { | |
1177 | int retlen; | |
1178 | unsigned char buf[PBUFSIZ]; | |
1179 | ||
1180 | buf[0] = 17; | |
1181 | buf[1] = 0; | |
1182 | ||
1183 | retlen = sds_send (buf, 7); | |
1184 | } | |
1185 | \f | |
1186 | /* Define the target operations vector. */ | |
1187 | ||
1188 | static struct target_ops sds_ops = | |
1189 | { | |
1190 | "sds", /* to_shortname */ | |
1191 | "Remote serial target with SDS protocol", /* to_longname */ | |
1192 | "Use a remote computer via a serial line, using the SDS protocol.\n\ | |
1193 | Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */ | |
1194 | sds_open, /* to_open */ | |
1195 | sds_close, /* to_close */ | |
1196 | NULL, /* to_attach */ | |
1197 | sds_detach, /* to_detach */ | |
1198 | sds_resume, /* to_resume */ | |
1199 | sds_wait, /* to_wait */ | |
1200 | sds_fetch_registers, /* to_fetch_registers */ | |
1201 | sds_store_registers, /* to_store_registers */ | |
1202 | sds_prepare_to_store, /* to_prepare_to_store */ | |
1203 | sds_xfer_memory, /* to_xfer_memory */ | |
1204 | sds_files_info, /* to_files_info */ | |
1205 | sds_insert_breakpoint, /* to_insert_breakpoint */ | |
1206 | sds_remove_breakpoint, /* to_remove_breakpoint */ | |
1207 | NULL, /* to_terminal_init */ | |
1208 | NULL, /* to_terminal_inferior */ | |
1209 | NULL, /* to_terminal_ours_for_output */ | |
1210 | NULL, /* to_terminal_ours */ | |
1211 | NULL, /* to_terminal_info */ | |
1212 | sds_kill, /* to_kill */ | |
1213 | generic_load, /* to_load */ | |
1214 | NULL, /* to_lookup_symbol */ | |
1215 | sds_create_inferior, /* to_create_inferior */ | |
1216 | sds_mourn, /* to_mourn_inferior */ | |
1217 | 0, /* to_can_run */ | |
1218 | 0, /* to_notice_signals */ | |
1219 | 0, /* to_thread_alive */ | |
1220 | 0, /* to_stop */ | |
1221 | process_stratum, /* to_stratum */ | |
1222 | NULL, /* to_next */ | |
1223 | 1, /* to_has_all_memory */ | |
1224 | 1, /* to_has_memory */ | |
1225 | 1, /* to_has_stack */ | |
1226 | 1, /* to_has_registers */ | |
1227 | 1, /* to_has_execution */ | |
1228 | NULL, /* sections */ | |
1229 | NULL, /* sections_end */ | |
1230 | OPS_MAGIC /* to_magic */ | |
1231 | }; | |
1232 | ||
1233 | /* Put a command string, in args, out to the monitor and display the | |
1234 | reply message. */ | |
1235 | ||
1236 | static void | |
1237 | sds_command (args, from_tty) | |
1238 | char *args; | |
1239 | int from_tty; | |
1240 | { | |
1241 | char *p; | |
1242 | int i, len, resp_len; | |
1243 | unsigned char buf[1000]; | |
1244 | ||
1245 | /* Convert hexadecimal chars into a byte buffer. */ | |
1246 | p = args; | |
1247 | len = 0; | |
1248 | while (*p != '\0') | |
1249 | { | |
1250 | buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]); | |
1251 | if (p[1] == '\0') | |
1252 | break; | |
1253 | p += 2; | |
1254 | } | |
1255 | ||
1256 | len = sds_send (buf, len); | |
1257 | ||
1258 | printf_filtered ("Reply is "); | |
1259 | for (i = 0; i < len; ++i) | |
1260 | { | |
1261 | printf_filtered ("%02x", buf[i]); | |
1262 | } | |
1263 | printf_filtered ("\n"); | |
1264 | } | |
1265 | ||
1266 | void | |
1267 | _initialize_remote_sds () | |
1268 | { | |
1269 | add_target (&sds_ops); | |
1270 | ||
1271 | add_show_from_set (add_set_cmd ("sdstimeout", no_class, | |
1272 | var_integer, (char *)&sds_timeout, | |
1273 | "Set timeout value for sds read.\n", &setlist), | |
1274 | &showlist); | |
1275 | ||
1276 | add_com ("sds", class_obscure, sds_command, | |
1277 | "Send a command to the SDS monitor."); | |
1278 | } |