Commit | Line | Data |
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c906108c SS |
1 | /* Remote target communications for serial-line targets using SDS' protocol. |
2 | Copyright 1997 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | /* This interface was written by studying the behavior of the SDS | |
22 | monitor on an ADS 821/860 board, and by consulting the | |
23 | documentation of the monitor that is available on Motorola's web | |
24 | site. -sts 8/13/97 */ | |
25 | ||
26 | #include "defs.h" | |
27 | #include "gdb_string.h" | |
28 | #include <fcntl.h> | |
29 | #include "frame.h" | |
30 | #include "inferior.h" | |
31 | #include "bfd.h" | |
32 | #include "symfile.h" | |
33 | #include "target.h" | |
34 | #include "wait.h" | |
35 | #include "gdbcmd.h" | |
36 | #include "objfiles.h" | |
37 | #include "gdb-stabs.h" | |
38 | #include "gdbthread.h" | |
39 | #include "gdbcore.h" | |
40 | #include "dcache.h" | |
41 | ||
42 | #ifdef USG | |
43 | #include <sys/types.h> | |
44 | #endif | |
45 | ||
46 | #include <signal.h> | |
47 | #include "serial.h" | |
48 | ||
49 | extern void _initialize_remote_sds PARAMS ((void)); | |
50 | ||
51 | /* Declarations of local functions. */ | |
52 | ||
53 | static int sds_write_bytes PARAMS ((CORE_ADDR, char *, int)); | |
54 | ||
55 | static int sds_read_bytes PARAMS ((CORE_ADDR, char *, int)); | |
56 | ||
c5aa993b | 57 | static void sds_files_info PARAMS ((struct target_ops * ignore)); |
c906108c SS |
58 | |
59 | static int sds_xfer_memory PARAMS ((CORE_ADDR, char *, | |
60 | int, int, struct target_ops *)); | |
61 | ||
62 | static void sds_prepare_to_store PARAMS ((void)); | |
63 | ||
64 | static void sds_fetch_registers PARAMS ((int)); | |
65 | ||
66 | static void sds_resume PARAMS ((int, int, enum target_signal)); | |
67 | ||
68 | static int sds_start_remote PARAMS ((PTR)); | |
69 | ||
70 | static void sds_open PARAMS ((char *, int)); | |
71 | ||
72 | static void sds_close PARAMS ((int)); | |
73 | ||
74 | static void sds_store_registers PARAMS ((int)); | |
75 | ||
76 | static void sds_mourn PARAMS ((void)); | |
77 | ||
78 | static void sds_create_inferior PARAMS ((char *, char *, char **)); | |
79 | ||
80 | static void sds_load PARAMS ((char *, int)); | |
81 | ||
82 | static int getmessage PARAMS ((unsigned char *, int)); | |
83 | ||
84 | static int putmessage PARAMS ((unsigned char *, int)); | |
85 | ||
86 | static int sds_send PARAMS ((unsigned char *, int)); | |
87 | ||
88 | static int readchar PARAMS ((int)); | |
89 | ||
90 | static int sds_wait PARAMS ((int, struct target_waitstatus *)); | |
91 | ||
92 | static void sds_kill PARAMS ((void)); | |
93 | ||
94 | static int tohex PARAMS ((int)); | |
95 | ||
96 | static int fromhex PARAMS ((int)); | |
97 | ||
98 | static void sds_detach PARAMS ((char *, int)); | |
99 | ||
100 | static void sds_interrupt PARAMS ((int)); | |
101 | ||
102 | static void sds_interrupt_twice PARAMS ((int)); | |
103 | ||
104 | static void interrupt_query PARAMS ((void)); | |
105 | ||
106 | static int read_frame PARAMS ((char *)); | |
107 | ||
108 | static int sds_insert_breakpoint PARAMS ((CORE_ADDR, char *)); | |
109 | ||
110 | static int sds_remove_breakpoint PARAMS ((CORE_ADDR, char *)); | |
111 | ||
112 | static void init_sds_ops PARAMS ((void)); | |
113 | ||
114 | static void sds_command PARAMS ((char *args, int from_tty)); | |
115 | ||
116 | /* Define the target operations vector. */ | |
117 | ||
118 | static struct target_ops sds_ops; | |
119 | ||
120 | /* This was 5 seconds, which is a long time to sit and wait. | |
121 | Unless this is going though some terminal server or multiplexer or | |
122 | other form of hairy serial connection, I would think 2 seconds would | |
123 | be plenty. */ | |
124 | ||
125 | static int sds_timeout = 2; | |
126 | ||
127 | /* Descriptor for I/O to remote machine. Initialize it to NULL so | |
128 | that sds_open knows that we don't have a file open when the program | |
129 | starts. */ | |
130 | ||
131 | static serial_t sds_desc = NULL; | |
132 | ||
133 | /* This limit comes from the monitor. */ | |
134 | ||
135 | #define PBUFSIZ 250 | |
136 | ||
137 | /* Maximum number of bytes to read/write at once. The value here | |
138 | is chosen to fill up a packet (the headers account for the 32). */ | |
139 | #define MAXBUFBYTES ((PBUFSIZ-32)/2) | |
140 | ||
141 | static int next_msg_id; | |
142 | ||
143 | static int just_started; | |
144 | ||
145 | static int message_pending; | |
c906108c | 146 | \f |
c5aa993b | 147 | |
c906108c SS |
148 | /* Clean up connection to a remote debugger. */ |
149 | ||
150 | /* ARGSUSED */ | |
151 | static void | |
152 | sds_close (quitting) | |
153 | int quitting; | |
154 | { | |
155 | if (sds_desc) | |
156 | SERIAL_CLOSE (sds_desc); | |
157 | sds_desc = NULL; | |
158 | } | |
159 | ||
160 | /* Stub for catch_errors. */ | |
161 | ||
162 | static int | |
163 | sds_start_remote (dummy) | |
164 | PTR dummy; | |
165 | { | |
166 | char c; | |
167 | unsigned char buf[200]; | |
168 | ||
169 | immediate_quit = 1; /* Allow user to interrupt it */ | |
170 | ||
171 | /* Ack any packet which the remote side has already sent. */ | |
172 | SERIAL_WRITE (sds_desc, "{#*\r\n", 5); | |
173 | SERIAL_WRITE (sds_desc, "{#}\r\n", 5); | |
174 | ||
175 | while ((c = readchar (1)) >= 0) | |
176 | printf_unfiltered ("%c", c); | |
177 | printf_unfiltered ("\n"); | |
178 | ||
179 | next_msg_id = 251; | |
180 | ||
181 | buf[0] = 26; | |
182 | sds_send (buf, 1); | |
183 | ||
184 | buf[0] = 0; | |
185 | sds_send (buf, 1); | |
186 | ||
187 | immediate_quit = 0; | |
188 | ||
189 | start_remote (); /* Initialize gdb process mechanisms */ | |
190 | return 1; | |
191 | } | |
192 | ||
193 | /* Open a connection to a remote debugger. | |
194 | NAME is the filename used for communication. */ | |
195 | ||
196 | static DCACHE *sds_dcache; | |
197 | ||
198 | static void | |
199 | sds_open (name, from_tty) | |
200 | char *name; | |
201 | int from_tty; | |
202 | { | |
203 | if (name == 0) | |
204 | error ("To open a remote debug connection, you need to specify what serial\n\ | |
205 | device is attached to the remote system (e.g. /dev/ttya)."); | |
206 | ||
207 | target_preopen (from_tty); | |
208 | ||
209 | unpush_target (&sds_ops); | |
210 | ||
211 | sds_dcache = dcache_init (sds_read_bytes, sds_write_bytes); | |
212 | ||
213 | sds_desc = SERIAL_OPEN (name); | |
214 | if (!sds_desc) | |
215 | perror_with_name (name); | |
216 | ||
217 | if (baud_rate != -1) | |
218 | { | |
219 | if (SERIAL_SETBAUDRATE (sds_desc, baud_rate)) | |
220 | { | |
221 | SERIAL_CLOSE (sds_desc); | |
222 | perror_with_name (name); | |
223 | } | |
224 | } | |
225 | ||
226 | ||
227 | SERIAL_RAW (sds_desc); | |
228 | ||
229 | /* If there is something sitting in the buffer we might take it as a | |
230 | response to a command, which would be bad. */ | |
231 | SERIAL_FLUSH_INPUT (sds_desc); | |
232 | ||
233 | if (from_tty) | |
234 | { | |
235 | puts_filtered ("Remote debugging using "); | |
236 | puts_filtered (name); | |
237 | puts_filtered ("\n"); | |
238 | } | |
239 | push_target (&sds_ops); /* Switch to using remote target now */ | |
240 | ||
241 | just_started = 1; | |
242 | ||
243 | /* Start the remote connection; if error (0), discard this target. | |
244 | In particular, if the user quits, be sure to discard it (we'd be | |
245 | in an inconsistent state otherwise). */ | |
c5aa993b | 246 | if (!catch_errors (sds_start_remote, NULL, |
c906108c SS |
247 | "Couldn't establish connection to remote target\n", |
248 | RETURN_MASK_ALL)) | |
249 | pop_target (); | |
250 | } | |
251 | ||
252 | /* This takes a program previously attached to and detaches it. After | |
253 | this is done, GDB can be used to debug some other program. We | |
254 | better not have left any breakpoints in the target program or it'll | |
255 | die when it hits one. */ | |
256 | ||
257 | static void | |
258 | sds_detach (args, from_tty) | |
259 | char *args; | |
260 | int from_tty; | |
261 | { | |
262 | char buf[PBUFSIZ]; | |
263 | ||
264 | if (args) | |
265 | error ("Argument given to \"detach\" when remotely debugging."); | |
266 | ||
267 | #if 0 | |
268 | /* Tell the remote target to detach. */ | |
269 | strcpy (buf, "D"); | |
270 | sds_send (buf, 1); | |
271 | #endif | |
272 | ||
273 | pop_target (); | |
274 | if (from_tty) | |
275 | puts_filtered ("Ending remote debugging.\n"); | |
276 | } | |
277 | ||
278 | /* Convert hex digit A to a number. */ | |
279 | ||
280 | static int | |
281 | fromhex (a) | |
282 | int a; | |
283 | { | |
284 | if (a >= '0' && a <= '9') | |
285 | return a - '0'; | |
286 | else if (a >= 'a' && a <= 'f') | |
287 | return a - 'a' + 10; | |
c5aa993b | 288 | else |
c906108c SS |
289 | error ("Reply contains invalid hex digit %d", a); |
290 | } | |
291 | ||
292 | /* Convert number NIB to a hex digit. */ | |
293 | ||
294 | static int | |
295 | tohex (nib) | |
296 | int nib; | |
297 | { | |
298 | if (nib < 10) | |
c5aa993b | 299 | return '0' + nib; |
c906108c | 300 | else |
c5aa993b | 301 | return 'a' + nib - 10; |
c906108c SS |
302 | } |
303 | ||
304 | static int | |
305 | tob64 (inbuf, outbuf, len) | |
306 | unsigned char *inbuf; | |
307 | char *outbuf; | |
308 | int len; | |
309 | { | |
310 | int i, sum; | |
311 | char *p; | |
312 | ||
313 | if (len % 3 != 0) | |
314 | error ("bad length"); | |
315 | ||
316 | p = outbuf; | |
317 | for (i = 0; i < len; i += 3) | |
318 | { | |
319 | /* Collect the next three bytes into a number. */ | |
320 | sum = ((long) *inbuf++) << 16; | |
c5aa993b | 321 | sum |= ((long) *inbuf++) << 8; |
c906108c SS |
322 | sum |= ((long) *inbuf++); |
323 | ||
324 | /* Spit out 4 6-bit encodings. */ | |
325 | *p++ = ((sum >> 18) & 0x3f) + '0'; | |
326 | *p++ = ((sum >> 12) & 0x3f) + '0'; | |
c5aa993b | 327 | *p++ = ((sum >> 6) & 0x3f) + '0'; |
c906108c SS |
328 | *p++ = (sum & 0x3f) + '0'; |
329 | } | |
330 | return (p - outbuf); | |
331 | } | |
332 | ||
333 | static int | |
334 | fromb64 (inbuf, outbuf, len) | |
335 | char *inbuf, *outbuf; | |
336 | int len; | |
337 | { | |
338 | int i, sum; | |
339 | ||
340 | if (len % 4 != 0) | |
341 | error ("bad length"); | |
342 | ||
343 | for (i = 0; i < len; i += 4) | |
344 | { | |
345 | /* Collect 4 6-bit digits. */ | |
c5aa993b | 346 | sum = (*inbuf++ - '0') << 18; |
c906108c | 347 | sum |= (*inbuf++ - '0') << 12; |
c5aa993b | 348 | sum |= (*inbuf++ - '0') << 6; |
c906108c SS |
349 | sum |= (*inbuf++ - '0'); |
350 | ||
351 | /* Now take the resulting 24-bit number and get three bytes out | |
352 | of it. */ | |
353 | *outbuf++ = (sum >> 16) & 0xff; | |
c5aa993b | 354 | *outbuf++ = (sum >> 8) & 0xff; |
c906108c SS |
355 | *outbuf++ = sum & 0xff; |
356 | } | |
357 | ||
358 | return (len / 4) * 3; | |
359 | } | |
c906108c | 360 | \f |
c5aa993b | 361 | |
c906108c SS |
362 | /* Tell the remote machine to resume. */ |
363 | ||
364 | static enum target_signal last_sent_signal = TARGET_SIGNAL_0; | |
365 | int last_sent_step; | |
366 | ||
367 | static void | |
368 | sds_resume (pid, step, siggnal) | |
369 | int pid, step; | |
370 | enum target_signal siggnal; | |
371 | { | |
372 | unsigned char buf[PBUFSIZ]; | |
373 | ||
374 | dcache_flush (sds_dcache); | |
375 | ||
376 | last_sent_signal = siggnal; | |
377 | last_sent_step = step; | |
378 | ||
379 | buf[0] = (step ? 21 : 20); | |
c5aa993b | 380 | buf[1] = 0; /* (should be signal?) */ |
c906108c SS |
381 | |
382 | sds_send (buf, 2); | |
383 | } | |
384 | \f | |
385 | /* Send a message to target to halt it. Target will respond, and send | |
386 | us a message pending notice. */ | |
387 | ||
388 | static void | |
389 | sds_interrupt (signo) | |
390 | int signo; | |
391 | { | |
392 | unsigned char buf[PBUFSIZ]; | |
393 | ||
394 | /* If this doesn't work, try more severe steps. */ | |
395 | signal (signo, sds_interrupt_twice); | |
c5aa993b | 396 | |
c906108c | 397 | if (remote_debug) |
9846de1b | 398 | fprintf_unfiltered (gdb_stdlog, "sds_interrupt called\n"); |
c906108c SS |
399 | |
400 | buf[0] = 25; | |
401 | sds_send (buf, 1); | |
402 | } | |
403 | ||
c5aa993b | 404 | static void (*ofunc) (); |
c906108c SS |
405 | |
406 | /* The user typed ^C twice. */ | |
407 | ||
408 | static void | |
409 | sds_interrupt_twice (signo) | |
410 | int signo; | |
411 | { | |
412 | signal (signo, ofunc); | |
c5aa993b | 413 | |
c906108c SS |
414 | interrupt_query (); |
415 | ||
416 | signal (signo, sds_interrupt); | |
417 | } | |
418 | ||
419 | /* Ask the user what to do when an interrupt is received. */ | |
420 | ||
421 | static void | |
422 | interrupt_query () | |
423 | { | |
424 | target_terminal_ours (); | |
425 | ||
426 | if (query ("Interrupted while waiting for the program.\n\ | |
427 | Give up (and stop debugging it)? ")) | |
428 | { | |
429 | target_mourn_inferior (); | |
430 | return_to_top_level (RETURN_QUIT); | |
431 | } | |
432 | ||
433 | target_terminal_inferior (); | |
434 | } | |
435 | ||
436 | /* If nonzero, ignore the next kill. */ | |
437 | int kill_kludge; | |
438 | ||
439 | /* Wait until the remote machine stops, then return, storing status in | |
440 | STATUS just as `wait' would. Returns "pid" (though it's not clear | |
441 | what, if anything, that means in the case of this target). */ | |
442 | ||
443 | static int | |
444 | sds_wait (pid, status) | |
445 | int pid; | |
446 | struct target_waitstatus *status; | |
447 | { | |
448 | unsigned char buf[PBUFSIZ]; | |
449 | int retlen; | |
450 | ||
451 | status->kind = TARGET_WAITKIND_EXITED; | |
452 | status->value.integer = 0; | |
453 | ||
454 | ofunc = (void (*)()) signal (SIGINT, sds_interrupt); | |
455 | ||
456 | signal (SIGINT, ofunc); | |
457 | ||
458 | if (just_started) | |
459 | { | |
460 | just_started = 0; | |
461 | status->kind = TARGET_WAITKIND_STOPPED; | |
462 | return inferior_pid; | |
463 | } | |
464 | ||
465 | while (1) | |
466 | { | |
467 | getmessage (buf, 1); | |
468 | ||
469 | if (message_pending) | |
470 | { | |
471 | buf[0] = 26; | |
472 | retlen = sds_send (buf, 1); | |
473 | if (remote_debug) | |
474 | { | |
9846de1b | 475 | fprintf_unfiltered (gdb_stdlog, "Signals: %02x%02x %02x %02x\n", |
7a292a7a | 476 | buf[0], buf[1], |
c906108c SS |
477 | buf[2], buf[3]); |
478 | } | |
479 | message_pending = 0; | |
480 | status->kind = TARGET_WAITKIND_STOPPED; | |
481 | status->value.sig = TARGET_SIGNAL_TRAP; | |
482 | goto got_status; | |
483 | } | |
484 | } | |
c5aa993b | 485 | got_status: |
c906108c SS |
486 | return inferior_pid; |
487 | } | |
488 | ||
489 | static unsigned char sprs[16]; | |
490 | ||
491 | /* Read the remote registers into the block REGS. */ | |
492 | /* Currently we just read all the registers, so we don't use regno. */ | |
493 | ||
494 | /* ARGSUSED */ | |
495 | static void | |
496 | sds_fetch_registers (regno) | |
497 | int regno; | |
498 | { | |
499 | unsigned char buf[PBUFSIZ]; | |
500 | int i, retlen; | |
501 | char *p; | |
502 | char regs[REGISTER_BYTES]; | |
503 | ||
504 | /* Unimplemented registers read as all bits zero. */ | |
505 | memset (regs, 0, REGISTER_BYTES); | |
506 | ||
507 | buf[0] = 18; | |
508 | buf[1] = 1; | |
509 | buf[2] = 0; | |
510 | retlen = sds_send (buf, 3); | |
511 | ||
512 | for (i = 0; i < 4 * 6; ++i) | |
513 | regs[i + 4 * 32 + 8 * 32] = buf[i]; | |
514 | for (i = 0; i < 4 * 4; ++i) | |
515 | sprs[i] = buf[i + 4 * 7]; | |
516 | ||
517 | buf[0] = 18; | |
518 | buf[1] = 2; | |
519 | buf[2] = 0; | |
520 | retlen = sds_send (buf, 3); | |
521 | ||
522 | for (i = 0; i < retlen; i++) | |
523 | regs[i] = buf[i]; | |
524 | ||
525 | /* (should warn about reply too short) */ | |
526 | ||
527 | for (i = 0; i < NUM_REGS; i++) | |
c5aa993b | 528 | supply_register (i, ®s[REGISTER_BYTE (i)]); |
c906108c SS |
529 | } |
530 | ||
531 | /* Prepare to store registers. Since we may send them all, we have to | |
532 | read out the ones we don't want to change first. */ | |
533 | ||
c5aa993b | 534 | static void |
c906108c SS |
535 | sds_prepare_to_store () |
536 | { | |
537 | /* Make sure the entire registers array is valid. */ | |
c5aa993b | 538 | read_register_bytes (0, (char *) NULL, REGISTER_BYTES); |
c906108c SS |
539 | } |
540 | ||
541 | /* Store register REGNO, or all registers if REGNO == -1, from the contents | |
542 | of REGISTERS. FIXME: ignores errors. */ | |
543 | ||
544 | static void | |
545 | sds_store_registers (regno) | |
546 | int regno; | |
547 | { | |
548 | unsigned char *p, buf[PBUFSIZ]; | |
549 | int i; | |
550 | ||
551 | /* Store all the special-purpose registers. */ | |
552 | p = buf; | |
553 | *p++ = 19; | |
554 | *p++ = 1; | |
555 | *p++ = 0; | |
556 | *p++ = 0; | |
557 | for (i = 0; i < 4 * 6; i++) | |
558 | *p++ = registers[i + 4 * 32 + 8 * 32]; | |
559 | for (i = 0; i < 4 * 1; i++) | |
560 | *p++ = 0; | |
561 | for (i = 0; i < 4 * 4; i++) | |
562 | *p++ = sprs[i]; | |
563 | ||
564 | sds_send (buf, p - buf); | |
565 | ||
566 | /* Store all the general-purpose registers. */ | |
567 | p = buf; | |
568 | *p++ = 19; | |
569 | *p++ = 2; | |
570 | *p++ = 0; | |
571 | *p++ = 0; | |
572 | for (i = 0; i < 4 * 32; i++) | |
573 | *p++ = registers[i]; | |
574 | ||
575 | sds_send (buf, p - buf); | |
576 | ||
577 | } | |
578 | \f | |
579 | /* Write memory data directly to the remote machine. This does not | |
580 | inform the data cache; the data cache uses this. MEMADDR is the | |
581 | address in the remote memory space. MYADDR is the address of the | |
582 | buffer in our space. LEN is the number of bytes. | |
583 | ||
584 | Returns number of bytes transferred, or 0 for error. */ | |
585 | ||
586 | static int | |
587 | sds_write_bytes (memaddr, myaddr, len) | |
588 | CORE_ADDR memaddr; | |
589 | char *myaddr; | |
590 | int len; | |
591 | { | |
592 | int max_buf_size; /* Max size of packet output buffer */ | |
593 | int origlen; | |
594 | unsigned char buf[PBUFSIZ]; | |
595 | int todo; | |
596 | int i; | |
597 | ||
598 | /* Chop the transfer down if necessary */ | |
599 | ||
600 | max_buf_size = 150; | |
601 | ||
602 | origlen = len; | |
603 | while (len > 0) | |
604 | { | |
605 | todo = min (len, max_buf_size); | |
606 | ||
607 | buf[0] = 13; | |
608 | buf[1] = 0; | |
609 | buf[2] = (int) (memaddr >> 24) & 0xff; | |
610 | buf[3] = (int) (memaddr >> 16) & 0xff; | |
c5aa993b JM |
611 | buf[4] = (int) (memaddr >> 8) & 0xff; |
612 | buf[5] = (int) (memaddr) & 0xff; | |
c906108c SS |
613 | buf[6] = 1; |
614 | buf[7] = 0; | |
615 | ||
616 | for (i = 0; i < todo; i++) | |
617 | buf[i + 8] = myaddr[i]; | |
618 | ||
619 | sds_send (buf, 8 + todo); | |
620 | ||
621 | /* (should look at result) */ | |
622 | ||
623 | myaddr += todo; | |
624 | memaddr += todo; | |
625 | len -= todo; | |
626 | } | |
627 | return origlen; | |
628 | } | |
629 | ||
630 | /* Read memory data directly from the remote machine. This does not | |
631 | use the data cache; the data cache uses this. MEMADDR is the | |
632 | address in the remote memory space. MYADDR is the address of the | |
633 | buffer in our space. LEN is the number of bytes. | |
634 | ||
635 | Returns number of bytes transferred, or 0 for error. */ | |
636 | ||
637 | static int | |
638 | sds_read_bytes (memaddr, myaddr, len) | |
639 | CORE_ADDR memaddr; | |
640 | char *myaddr; | |
641 | int len; | |
642 | { | |
643 | int max_buf_size; /* Max size of packet output buffer */ | |
644 | int origlen, retlen; | |
645 | unsigned char buf[PBUFSIZ]; | |
646 | int todo; | |
647 | int i; | |
648 | ||
649 | /* Chop the transfer down if necessary */ | |
650 | ||
651 | max_buf_size = 150; | |
652 | ||
653 | origlen = len; | |
654 | while (len > 0) | |
655 | { | |
656 | todo = min (len, max_buf_size); | |
657 | ||
658 | buf[0] = 12; | |
659 | buf[1] = 0; | |
660 | buf[2] = (int) (memaddr >> 24) & 0xff; | |
661 | buf[3] = (int) (memaddr >> 16) & 0xff; | |
c5aa993b JM |
662 | buf[4] = (int) (memaddr >> 8) & 0xff; |
663 | buf[5] = (int) (memaddr) & 0xff; | |
c906108c | 664 | buf[6] = (int) (todo >> 8) & 0xff; |
c5aa993b | 665 | buf[7] = (int) (todo) & 0xff; |
c906108c SS |
666 | buf[8] = 1; |
667 | ||
668 | retlen = sds_send (buf, 9); | |
669 | ||
670 | if (retlen - 2 != todo) | |
671 | { | |
672 | return 0; | |
673 | } | |
674 | ||
675 | /* Reply describes memory byte by byte. */ | |
676 | ||
677 | for (i = 0; i < todo; i++) | |
678 | myaddr[i] = buf[i + 2]; | |
679 | ||
680 | myaddr += todo; | |
681 | memaddr += todo; | |
682 | len -= todo; | |
683 | } | |
684 | ||
685 | return origlen; | |
686 | } | |
687 | \f | |
688 | /* Read or write LEN bytes from inferior memory at MEMADDR, | |
689 | transferring to or from debugger address MYADDR. Write to inferior | |
690 | if SHOULD_WRITE is nonzero. Returns length of data written or | |
691 | read; 0 for error. */ | |
692 | ||
693 | /* ARGSUSED */ | |
694 | static int | |
c5aa993b | 695 | sds_xfer_memory (memaddr, myaddr, len, should_write, target) |
c906108c SS |
696 | CORE_ADDR memaddr; |
697 | char *myaddr; | |
698 | int len; | |
699 | int should_write; | |
c5aa993b | 700 | struct target_ops *target; /* ignored */ |
c906108c SS |
701 | { |
702 | return dcache_xfer_memory (sds_dcache, memaddr, myaddr, len, should_write); | |
703 | } | |
c906108c | 704 | \f |
c5aa993b | 705 | |
c906108c SS |
706 | static void |
707 | sds_files_info (ignore) | |
708 | struct target_ops *ignore; | |
709 | { | |
710 | puts_filtered ("Debugging over a serial connection, using SDS protocol.\n"); | |
711 | } | |
712 | \f | |
713 | /* Stuff for dealing with the packets which are part of this protocol. | |
714 | See comment at top of file for details. */ | |
715 | ||
716 | /* Read a single character from the remote end, masking it down to 7 bits. */ | |
717 | ||
718 | static int | |
719 | readchar (timeout) | |
720 | int timeout; | |
721 | { | |
722 | int ch; | |
723 | ||
724 | ch = SERIAL_READCHAR (sds_desc, timeout); | |
725 | ||
726 | if (remote_debug > 1 && ch >= 0) | |
9846de1b | 727 | fprintf_unfiltered (gdb_stdlog, "%c(%x)", ch, ch); |
c906108c SS |
728 | |
729 | switch (ch) | |
730 | { | |
731 | case SERIAL_EOF: | |
732 | error ("Remote connection closed"); | |
733 | case SERIAL_ERROR: | |
734 | perror_with_name ("Remote communication error"); | |
735 | case SERIAL_TIMEOUT: | |
736 | return ch; | |
737 | default: | |
738 | return ch & 0x7f; | |
739 | } | |
740 | } | |
741 | ||
742 | /* An SDS-style checksum is a sum of the bytes modulo 253. (Presumably | |
743 | because 253, 254, and 255 are special flags in the protocol.) */ | |
744 | ||
745 | static int | |
746 | compute_checksum (csum, buf, len) | |
747 | int csum, len; | |
748 | char *buf; | |
749 | { | |
750 | int i; | |
751 | ||
752 | for (i = 0; i < len; ++i) | |
753 | csum += (unsigned char) buf[i]; | |
754 | ||
755 | csum %= 253; | |
756 | return csum; | |
757 | } | |
758 | ||
759 | /* Send the command in BUF to the remote machine, and read the reply | |
760 | into BUF also. */ | |
761 | ||
762 | static int | |
763 | sds_send (buf, len) | |
764 | unsigned char *buf; | |
765 | int len; | |
766 | { | |
767 | putmessage (buf, len); | |
768 | ||
769 | return getmessage (buf, 0); | |
770 | } | |
771 | ||
772 | /* Send a message to the remote machine. */ | |
773 | ||
774 | static int | |
775 | putmessage (buf, len) | |
776 | unsigned char *buf; | |
777 | int len; | |
778 | { | |
779 | int i, enclen; | |
780 | unsigned char csum = 0; | |
781 | char buf2[PBUFSIZ], buf3[PBUFSIZ]; | |
782 | unsigned char header[3]; | |
783 | int ch; | |
784 | int tcount = 0; | |
785 | char *p; | |
786 | ||
787 | /* Copy the packet into buffer BUF2, encapsulating it | |
788 | and giving it a checksum. */ | |
789 | ||
790 | if (len > 170) /* Prosanity check */ | |
c5aa993b | 791 | abort (); |
c906108c SS |
792 | |
793 | if (remote_debug) | |
794 | { | |
9846de1b | 795 | fprintf_unfiltered (gdb_stdlog, "Message to send: \""); |
c906108c | 796 | for (i = 0; i < len; ++i) |
9846de1b JM |
797 | fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); |
798 | fprintf_unfiltered (gdb_stdlog, "\"\n"); | |
c906108c SS |
799 | } |
800 | ||
801 | p = buf2; | |
802 | *p++ = '$'; | |
803 | ||
804 | if (len % 3 != 0) | |
805 | { | |
806 | buf[len] = '\0'; | |
c5aa993b | 807 | buf[len + 1] = '\0'; |
c906108c SS |
808 | } |
809 | ||
810 | header[1] = next_msg_id; | |
811 | ||
812 | header[2] = len; | |
813 | ||
814 | csum = compute_checksum (csum, buf, len); | |
815 | csum = compute_checksum (csum, header + 1, 2); | |
816 | ||
817 | header[0] = csum; | |
818 | ||
819 | tob64 (header, p, 3); | |
820 | p += 4; | |
821 | enclen = tob64 (buf, buf3, ((len + 2) / 3) * 3); | |
822 | ||
823 | for (i = 0; i < enclen; ++i) | |
824 | *p++ = buf3[i]; | |
825 | *p++ = '\r'; | |
826 | *p++ = '\n'; | |
827 | ||
828 | next_msg_id = (next_msg_id + 3) % 245; | |
829 | ||
830 | /* Send it over and over until we get a positive ack. */ | |
831 | ||
832 | while (1) | |
833 | { | |
834 | int started_error_output = 0; | |
835 | ||
836 | if (remote_debug) | |
837 | { | |
838 | *p = '\0'; | |
9846de1b JM |
839 | fprintf_unfiltered (gdb_stdlog, "Sending encoded: \"%s\"", buf2); |
840 | fprintf_unfiltered (gdb_stdlog, | |
841 | " (Checksum %d, id %d, length %d)\n", | |
842 | header[0], header[1], header[2]); | |
843 | gdb_flush (gdb_stdlog); | |
c906108c SS |
844 | } |
845 | if (SERIAL_WRITE (sds_desc, buf2, p - buf2)) | |
846 | perror_with_name ("putmessage: write failed"); | |
847 | ||
848 | return 1; | |
849 | ||
850 | } | |
851 | ||
852 | } | |
853 | ||
854 | /* Come here after finding the start of the frame. Collect the rest | |
855 | into BUF. Returns 0 on any error, 1 on success. */ | |
856 | ||
857 | static int | |
858 | read_frame (buf) | |
859 | char *buf; | |
860 | { | |
861 | char *bp; | |
862 | int c; | |
863 | ||
864 | bp = buf; | |
865 | ||
866 | while (1) | |
867 | { | |
868 | c = readchar (sds_timeout); | |
869 | ||
870 | switch (c) | |
871 | { | |
872 | case SERIAL_TIMEOUT: | |
873 | if (remote_debug) | |
9846de1b | 874 | fputs_filtered ("Timeout in mid-message, retrying\n", gdb_stdlog); |
c906108c SS |
875 | return 0; |
876 | case '$': | |
877 | if (remote_debug) | |
9846de1b JM |
878 | fputs_filtered ("Saw new packet start in middle of old one\n", |
879 | gdb_stdlog); | |
c906108c SS |
880 | return 0; /* Start a new packet, count retries */ |
881 | case '\r': | |
882 | break; | |
883 | ||
884 | case '\n': | |
885 | { | |
886 | *bp = '\000'; | |
887 | if (remote_debug) | |
9846de1b | 888 | fprintf_unfiltered (gdb_stdlog, "Received encoded: \"%s\"\n", |
c906108c SS |
889 | buf); |
890 | return 1; | |
891 | } | |
892 | ||
893 | default: | |
894 | if (bp < buf + PBUFSIZ - 1) | |
895 | { | |
896 | *bp++ = c; | |
897 | continue; | |
898 | } | |
899 | ||
900 | *bp = '\0'; | |
901 | puts_filtered ("Message too long: "); | |
902 | puts_filtered (buf); | |
903 | puts_filtered ("\n"); | |
904 | ||
905 | return 0; | |
906 | } | |
907 | } | |
908 | } | |
909 | ||
910 | /* Read a packet from the remote machine, with error checking, | |
911 | and store it in BUF. BUF is expected to be of size PBUFSIZ. | |
912 | If FOREVER, wait forever rather than timing out; this is used | |
913 | while the target is executing user code. */ | |
914 | ||
915 | static int | |
916 | getmessage (buf, forever) | |
917 | unsigned char *buf; | |
918 | int forever; | |
919 | { | |
920 | int c, c2, c3; | |
921 | int tries; | |
922 | int timeout; | |
923 | int val, i, len, csum; | |
924 | unsigned char header[3]; | |
925 | unsigned char inbuf[500]; | |
926 | ||
927 | strcpy (buf, "timeout"); | |
928 | ||
929 | if (forever) | |
930 | { | |
c906108c | 931 | timeout = watchdog > 0 ? watchdog : -1; |
c906108c SS |
932 | } |
933 | ||
934 | else | |
935 | timeout = sds_timeout; | |
936 | ||
937 | #define MAX_TRIES 3 | |
938 | ||
939 | for (tries = 1; tries <= MAX_TRIES; tries++) | |
940 | { | |
941 | /* This can loop forever if the remote side sends us characters | |
c5aa993b JM |
942 | continuously, but if it pauses, we'll get a zero from readchar |
943 | because of timeout. Then we'll count that as a retry. */ | |
c906108c SS |
944 | |
945 | /* Note that we will only wait forever prior to the start of a packet. | |
c5aa993b JM |
946 | After that, we expect characters to arrive at a brisk pace. They |
947 | should show up within sds_timeout intervals. */ | |
c906108c SS |
948 | |
949 | do | |
950 | { | |
951 | c = readchar (timeout); | |
952 | ||
953 | if (c == SERIAL_TIMEOUT) | |
954 | { | |
c906108c SS |
955 | if (forever) /* Watchdog went off. Kill the target. */ |
956 | { | |
957 | target_mourn_inferior (); | |
958 | error ("Watchdog has expired. Target detached.\n"); | |
959 | } | |
c906108c | 960 | if (remote_debug) |
9846de1b | 961 | fputs_filtered ("Timed out.\n", gdb_stdlog); |
c906108c SS |
962 | goto retry; |
963 | } | |
964 | } | |
965 | while (c != '$' && c != '{'); | |
966 | ||
967 | /* We might have seen a "trigraph", a sequence of three characters | |
c5aa993b | 968 | that indicate various sorts of communication state. */ |
c906108c SS |
969 | |
970 | if (c == '{') | |
971 | { | |
972 | /* Read the other two chars of the trigraph. */ | |
973 | c2 = readchar (timeout); | |
974 | c3 = readchar (timeout); | |
975 | if (remote_debug) | |
9846de1b | 976 | fprintf_unfiltered (gdb_stdlog, "Trigraph %c%c%c received\n", |
c906108c SS |
977 | c, c2, c3); |
978 | if (c3 == '+') | |
979 | { | |
980 | message_pending = 1; | |
c5aa993b | 981 | return 0; /*???? */ |
c906108c SS |
982 | } |
983 | continue; | |
984 | } | |
985 | ||
986 | val = read_frame (inbuf); | |
987 | ||
988 | if (val == 1) | |
989 | { | |
990 | fromb64 (inbuf, header, 4); | |
991 | /* (should check out other bits) */ | |
992 | fromb64 (inbuf + 4, buf, strlen (inbuf) - 4); | |
993 | ||
994 | len = header[2]; | |
995 | ||
996 | csum = 0; | |
997 | csum = compute_checksum (csum, buf, len); | |
998 | csum = compute_checksum (csum, header + 1, 2); | |
999 | ||
1000 | if (csum != header[0]) | |
1001 | fprintf_unfiltered (gdb_stderr, | |
c5aa993b | 1002 | "Checksum mismatch: computed %d, received %d\n", |
c906108c SS |
1003 | csum, header[0]); |
1004 | ||
1005 | if (header[2] == 0xff) | |
1006 | fprintf_unfiltered (gdb_stderr, "Requesting resend...\n"); | |
1007 | ||
1008 | if (remote_debug) | |
1009 | { | |
9846de1b | 1010 | fprintf_unfiltered (gdb_stdlog, |
c5aa993b | 1011 | "... (Got checksum %d, id %d, length %d)\n", |
c906108c | 1012 | header[0], header[1], header[2]); |
9846de1b | 1013 | fprintf_unfiltered (gdb_stdlog, "Message received: \""); |
c906108c SS |
1014 | for (i = 0; i < len; ++i) |
1015 | { | |
9846de1b | 1016 | fprintf_unfiltered (gdb_stdlog, "%02x", (unsigned char) buf[i]); |
c906108c | 1017 | } |
9846de1b | 1018 | fprintf_unfiltered (gdb_stdlog, "\"\n"); |
c906108c SS |
1019 | } |
1020 | ||
1021 | /* no ack required? */ | |
1022 | return len; | |
1023 | } | |
1024 | ||
1025 | /* Try the whole thing again. */ | |
1026 | retry: | |
1027 | /* need to do something here */ | |
1028 | } | |
1029 | ||
1030 | /* We have tried hard enough, and just can't receive the packet. Give up. */ | |
1031 | ||
1032 | printf_unfiltered ("Ignoring packet error, continuing...\n"); | |
1033 | return 0; | |
1034 | } | |
1035 | \f | |
1036 | static void | |
1037 | sds_kill () | |
1038 | { | |
1039 | /* Don't try to do anything to the target. */ | |
1040 | } | |
1041 | ||
1042 | static void | |
1043 | sds_mourn () | |
1044 | { | |
1045 | unpush_target (&sds_ops); | |
1046 | generic_mourn_inferior (); | |
1047 | } | |
1048 | ||
1049 | static void | |
1050 | sds_create_inferior (exec_file, args, env) | |
1051 | char *exec_file; | |
1052 | char *args; | |
1053 | char **env; | |
1054 | { | |
1055 | inferior_pid = 42000; | |
1056 | ||
1057 | /* Clean up from the last time we were running. */ | |
1058 | clear_proceed_status (); | |
1059 | ||
1060 | /* Let the remote process run. */ | |
1061 | proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0); | |
1062 | } | |
1063 | ||
1064 | static void | |
1065 | sds_load (filename, from_tty) | |
c5aa993b JM |
1066 | char *filename; |
1067 | int from_tty; | |
c906108c SS |
1068 | { |
1069 | generic_load (filename, from_tty); | |
1070 | ||
1071 | inferior_pid = 0; | |
1072 | } | |
1073 | \f | |
1074 | /* The SDS monitor has commands for breakpoint insertion, although it | |
1075 | it doesn't actually manage the breakpoints, it just returns the | |
1076 | replaced instruction back to the debugger. */ | |
1077 | ||
1078 | static int | |
1079 | sds_insert_breakpoint (addr, contents_cache) | |
1080 | CORE_ADDR addr; | |
1081 | char *contents_cache; | |
1082 | { | |
1083 | int i, retlen; | |
1084 | unsigned char *p, buf[PBUFSIZ]; | |
1085 | ||
1086 | p = buf; | |
1087 | *p++ = 16; | |
1088 | *p++ = 0; | |
1089 | *p++ = (int) (addr >> 24) & 0xff; | |
1090 | *p++ = (int) (addr >> 16) & 0xff; | |
c5aa993b JM |
1091 | *p++ = (int) (addr >> 8) & 0xff; |
1092 | *p++ = (int) (addr) & 0xff; | |
1093 | ||
c906108c SS |
1094 | retlen = sds_send (buf, p - buf); |
1095 | ||
1096 | for (i = 0; i < 4; ++i) | |
1097 | contents_cache[i] = buf[i + 2]; | |
1098 | ||
1099 | return 0; | |
1100 | } | |
1101 | ||
1102 | static int | |
1103 | sds_remove_breakpoint (addr, contents_cache) | |
1104 | CORE_ADDR addr; | |
1105 | char *contents_cache; | |
1106 | { | |
1107 | int i, retlen; | |
1108 | unsigned char *p, buf[PBUFSIZ]; | |
1109 | ||
1110 | p = buf; | |
1111 | *p++ = 17; | |
1112 | *p++ = 0; | |
1113 | *p++ = (int) (addr >> 24) & 0xff; | |
1114 | *p++ = (int) (addr >> 16) & 0xff; | |
c5aa993b JM |
1115 | *p++ = (int) (addr >> 8) & 0xff; |
1116 | *p++ = (int) (addr) & 0xff; | |
c906108c SS |
1117 | for (i = 0; i < 4; ++i) |
1118 | *p++ = contents_cache[i]; | |
1119 | ||
1120 | retlen = sds_send (buf, p - buf); | |
1121 | ||
1122 | return 0; | |
1123 | } | |
1124 | \f | |
c5aa993b | 1125 | static void |
c906108c SS |
1126 | init_sds_ops () |
1127 | { | |
1128 | sds_ops.to_shortname = "sds"; | |
1129 | sds_ops.to_longname = "Remote serial target with SDS protocol"; | |
1130 | sds_ops.to_doc = "Use a remote computer via a serial line; using the SDS protocol.\n\ | |
1131 | Specify the serial device it is connected to (e.g. /dev/ttya)."; | |
1132 | sds_ops.to_open = sds_open; | |
1133 | sds_ops.to_close = sds_close; | |
1134 | sds_ops.to_detach = sds_detach; | |
1135 | sds_ops.to_resume = sds_resume; | |
1136 | sds_ops.to_wait = sds_wait; | |
1137 | sds_ops.to_fetch_registers = sds_fetch_registers; | |
1138 | sds_ops.to_store_registers = sds_store_registers; | |
1139 | sds_ops.to_prepare_to_store = sds_prepare_to_store; | |
1140 | sds_ops.to_xfer_memory = sds_xfer_memory; | |
1141 | sds_ops.to_files_info = sds_files_info; | |
1142 | sds_ops.to_insert_breakpoint = sds_insert_breakpoint; | |
1143 | sds_ops.to_remove_breakpoint = sds_remove_breakpoint; | |
1144 | sds_ops.to_kill = sds_kill; | |
1145 | sds_ops.to_load = sds_load; | |
1146 | sds_ops.to_create_inferior = sds_create_inferior; | |
1147 | sds_ops.to_mourn_inferior = sds_mourn; | |
1148 | sds_ops.to_stratum = process_stratum; | |
1149 | sds_ops.to_has_all_memory = 1; | |
1150 | sds_ops.to_has_memory = 1; | |
1151 | sds_ops.to_has_stack = 1; | |
1152 | sds_ops.to_has_registers = 1; | |
1153 | sds_ops.to_has_execution = 1; | |
1154 | sds_ops.to_magic = OPS_MAGIC; | |
1155 | } | |
1156 | ||
1157 | /* Put a command string, in args, out to the monitor and display the | |
1158 | reply message. */ | |
1159 | ||
1160 | static void | |
1161 | sds_command (args, from_tty) | |
1162 | char *args; | |
1163 | int from_tty; | |
1164 | { | |
1165 | char *p; | |
1166 | int i, len, retlen; | |
1167 | unsigned char buf[1000]; | |
1168 | ||
1169 | /* Convert hexadecimal chars into a byte buffer. */ | |
1170 | p = args; | |
1171 | len = 0; | |
1172 | while (*p != '\0') | |
1173 | { | |
1174 | buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]); | |
1175 | if (p[1] == '\0') | |
1176 | break; | |
1177 | p += 2; | |
1178 | } | |
1179 | ||
1180 | retlen = sds_send (buf, len); | |
1181 | ||
1182 | printf_filtered ("Reply is "); | |
1183 | for (i = 0; i < retlen; ++i) | |
1184 | { | |
1185 | printf_filtered ("%02x", buf[i]); | |
c5aa993b | 1186 | } |
c906108c SS |
1187 | printf_filtered ("\n"); |
1188 | } | |
1189 | ||
1190 | void | |
1191 | _initialize_remote_sds () | |
1192 | { | |
1193 | init_sds_ops (); | |
1194 | add_target (&sds_ops); | |
1195 | ||
1196 | add_show_from_set (add_set_cmd ("sdstimeout", no_class, | |
c5aa993b JM |
1197 | var_integer, (char *) &sds_timeout, |
1198 | "Set timeout value for sds read.\n", &setlist), | |
c906108c SS |
1199 | &showlist); |
1200 | ||
1201 | add_com ("sds", class_obscure, sds_command, | |
c5aa993b | 1202 | "Send a command to the SDS monitor."); |
c906108c | 1203 | } |