Commit | Line | Data |
---|---|---|
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" | |
03f2053f | 34 | #include "gdb_wait.h" |
c906108c SS |
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 | ||
a14ed312 | 49 | extern void _initialize_remote_sds (void); |
c906108c SS |
50 | |
51 | /* Declarations of local functions. */ | |
52 | ||
a14ed312 | 53 | static int sds_write_bytes (CORE_ADDR, char *, int); |
c906108c | 54 | |
a14ed312 | 55 | static int sds_read_bytes (CORE_ADDR, char *, int); |
c906108c | 56 | |
a14ed312 | 57 | static void sds_files_info (struct target_ops *ignore); |
c906108c | 58 | |
a14ed312 | 59 | static int sds_xfer_memory (CORE_ADDR, char *, int, int, struct target_ops *); |
c906108c | 60 | |
a14ed312 | 61 | static void sds_prepare_to_store (void); |
c906108c | 62 | |
a14ed312 | 63 | static void sds_fetch_registers (int); |
c906108c | 64 | |
a14ed312 | 65 | static void sds_resume (int, int, enum target_signal); |
c906108c | 66 | |
a14ed312 | 67 | static int sds_start_remote (PTR); |
c906108c | 68 | |
a14ed312 | 69 | static void sds_open (char *, int); |
c906108c | 70 | |
a14ed312 | 71 | static void sds_close (int); |
c906108c | 72 | |
a14ed312 | 73 | static void sds_store_registers (int); |
c906108c | 74 | |
a14ed312 | 75 | static void sds_mourn (void); |
c906108c | 76 | |
a14ed312 | 77 | static void sds_create_inferior (char *, char *, char **); |
c906108c | 78 | |
a14ed312 | 79 | static void sds_load (char *, int); |
c906108c | 80 | |
a14ed312 | 81 | static int getmessage (unsigned char *, int); |
c906108c | 82 | |
a14ed312 | 83 | static int putmessage (unsigned char *, int); |
c906108c | 84 | |
a14ed312 | 85 | static int sds_send (unsigned char *, int); |
c906108c | 86 | |
a14ed312 | 87 | static int readchar (int); |
c906108c | 88 | |
a14ed312 | 89 | static int sds_wait (int, struct target_waitstatus *); |
c906108c | 90 | |
a14ed312 | 91 | static void sds_kill (void); |
c906108c | 92 | |
a14ed312 | 93 | static int tohex (int); |
c906108c | 94 | |
a14ed312 | 95 | static int fromhex (int); |
c906108c | 96 | |
a14ed312 | 97 | static void sds_detach (char *, int); |
c906108c | 98 | |
a14ed312 | 99 | static void sds_interrupt (int); |
c906108c | 100 | |
a14ed312 | 101 | static void sds_interrupt_twice (int); |
c906108c | 102 | |
a14ed312 | 103 | static void interrupt_query (void); |
c906108c | 104 | |
a14ed312 | 105 | static int read_frame (char *); |
c906108c | 106 | |
a14ed312 | 107 | static int sds_insert_breakpoint (CORE_ADDR, char *); |
c906108c | 108 | |
a14ed312 | 109 | static int sds_remove_breakpoint (CORE_ADDR, char *); |
c906108c | 110 | |
a14ed312 | 111 | static void init_sds_ops (void); |
c906108c | 112 | |
a14ed312 | 113 | static void sds_command (char *args, int from_tty); |
c906108c SS |
114 | |
115 | /* Define the target operations vector. */ | |
116 | ||
117 | static struct target_ops sds_ops; | |
118 | ||
119 | /* This was 5 seconds, which is a long time to sit and wait. | |
120 | Unless this is going though some terminal server or multiplexer or | |
121 | other form of hairy serial connection, I would think 2 seconds would | |
122 | be plenty. */ | |
123 | ||
124 | static int sds_timeout = 2; | |
125 | ||
126 | /* Descriptor for I/O to remote machine. Initialize it to NULL so | |
127 | that sds_open knows that we don't have a file open when the program | |
128 | starts. */ | |
129 | ||
130 | static serial_t sds_desc = NULL; | |
131 | ||
132 | /* This limit comes from the monitor. */ | |
133 | ||
134 | #define PBUFSIZ 250 | |
135 | ||
136 | /* Maximum number of bytes to read/write at once. The value here | |
137 | is chosen to fill up a packet (the headers account for the 32). */ | |
138 | #define MAXBUFBYTES ((PBUFSIZ-32)/2) | |
139 | ||
140 | static int next_msg_id; | |
141 | ||
142 | static int just_started; | |
143 | ||
144 | static int message_pending; | |
c906108c | 145 | \f |
c5aa993b | 146 | |
c906108c SS |
147 | /* Clean up connection to a remote debugger. */ |
148 | ||
149 | /* ARGSUSED */ | |
150 | static void | |
fba45db2 | 151 | sds_close (int quitting) |
c906108c SS |
152 | { |
153 | if (sds_desc) | |
154 | SERIAL_CLOSE (sds_desc); | |
155 | sds_desc = NULL; | |
156 | } | |
157 | ||
158 | /* Stub for catch_errors. */ | |
159 | ||
160 | static int | |
fba45db2 | 161 | sds_start_remote (PTR dummy) |
c906108c SS |
162 | { |
163 | char c; | |
164 | unsigned char buf[200]; | |
165 | ||
166 | immediate_quit = 1; /* Allow user to interrupt it */ | |
167 | ||
168 | /* Ack any packet which the remote side has already sent. */ | |
169 | SERIAL_WRITE (sds_desc, "{#*\r\n", 5); | |
170 | SERIAL_WRITE (sds_desc, "{#}\r\n", 5); | |
171 | ||
172 | while ((c = readchar (1)) >= 0) | |
173 | printf_unfiltered ("%c", c); | |
174 | printf_unfiltered ("\n"); | |
175 | ||
176 | next_msg_id = 251; | |
177 | ||
178 | buf[0] = 26; | |
179 | sds_send (buf, 1); | |
180 | ||
181 | buf[0] = 0; | |
182 | sds_send (buf, 1); | |
183 | ||
184 | immediate_quit = 0; | |
185 | ||
186 | start_remote (); /* Initialize gdb process mechanisms */ | |
187 | return 1; | |
188 | } | |
189 | ||
190 | /* Open a connection to a remote debugger. | |
191 | NAME is the filename used for communication. */ | |
192 | ||
193 | static DCACHE *sds_dcache; | |
194 | ||
195 | static void | |
fba45db2 | 196 | sds_open (char *name, int from_tty) |
c906108c SS |
197 | { |
198 | if (name == 0) | |
199 | error ("To open a remote debug connection, you need to specify what serial\n\ | |
200 | device is attached to the remote system (e.g. /dev/ttya)."); | |
201 | ||
202 | target_preopen (from_tty); | |
203 | ||
204 | unpush_target (&sds_ops); | |
205 | ||
f1d7622b C |
206 | if (!sds_dcache) |
207 | sds_dcache = dcache_init (sds_read_bytes, sds_write_bytes); | |
208 | else | |
e99586d5 | 209 | dcache_invd (sds_dcache); |
c906108c SS |
210 | |
211 | sds_desc = SERIAL_OPEN (name); | |
212 | if (!sds_desc) | |
213 | perror_with_name (name); | |
214 | ||
215 | if (baud_rate != -1) | |
216 | { | |
217 | if (SERIAL_SETBAUDRATE (sds_desc, baud_rate)) | |
218 | { | |
219 | SERIAL_CLOSE (sds_desc); | |
220 | perror_with_name (name); | |
221 | } | |
222 | } | |
223 | ||
224 | ||
225 | SERIAL_RAW (sds_desc); | |
226 | ||
227 | /* If there is something sitting in the buffer we might take it as a | |
228 | response to a command, which would be bad. */ | |
229 | SERIAL_FLUSH_INPUT (sds_desc); | |
230 | ||
231 | if (from_tty) | |
232 | { | |
233 | puts_filtered ("Remote debugging using "); | |
234 | puts_filtered (name); | |
235 | puts_filtered ("\n"); | |
236 | } | |
237 | push_target (&sds_ops); /* Switch to using remote target now */ | |
238 | ||
239 | just_started = 1; | |
240 | ||
241 | /* Start the remote connection; if error (0), discard this target. | |
242 | In particular, if the user quits, be sure to discard it (we'd be | |
243 | in an inconsistent state otherwise). */ | |
c5aa993b | 244 | if (!catch_errors (sds_start_remote, NULL, |
c906108c SS |
245 | "Couldn't establish connection to remote target\n", |
246 | RETURN_MASK_ALL)) | |
247 | pop_target (); | |
248 | } | |
249 | ||
250 | /* This takes a program previously attached to and detaches it. After | |
251 | this is done, GDB can be used to debug some other program. We | |
252 | better not have left any breakpoints in the target program or it'll | |
253 | die when it hits one. */ | |
254 | ||
255 | static void | |
fba45db2 | 256 | sds_detach (char *args, int from_tty) |
c906108c SS |
257 | { |
258 | char buf[PBUFSIZ]; | |
259 | ||
260 | if (args) | |
261 | error ("Argument given to \"detach\" when remotely debugging."); | |
262 | ||
263 | #if 0 | |
264 | /* Tell the remote target to detach. */ | |
265 | strcpy (buf, "D"); | |
266 | sds_send (buf, 1); | |
267 | #endif | |
268 | ||
269 | pop_target (); | |
270 | if (from_tty) | |
271 | puts_filtered ("Ending remote debugging.\n"); | |
272 | } | |
273 | ||
274 | /* Convert hex digit A to a number. */ | |
275 | ||
276 | static int | |
fba45db2 | 277 | fromhex (int a) |
c906108c SS |
278 | { |
279 | if (a >= '0' && a <= '9') | |
280 | return a - '0'; | |
281 | else if (a >= 'a' && a <= 'f') | |
282 | return a - 'a' + 10; | |
c5aa993b | 283 | else |
c906108c SS |
284 | error ("Reply contains invalid hex digit %d", a); |
285 | } | |
286 | ||
287 | /* Convert number NIB to a hex digit. */ | |
288 | ||
289 | static int | |
fba45db2 | 290 | tohex (int nib) |
c906108c SS |
291 | { |
292 | if (nib < 10) | |
c5aa993b | 293 | return '0' + nib; |
c906108c | 294 | else |
c5aa993b | 295 | return 'a' + nib - 10; |
c906108c SS |
296 | } |
297 | ||
298 | static int | |
fba45db2 | 299 | tob64 (unsigned char *inbuf, char *outbuf, int len) |
c906108c SS |
300 | { |
301 | int i, sum; | |
302 | char *p; | |
303 | ||
304 | if (len % 3 != 0) | |
305 | error ("bad length"); | |
306 | ||
307 | p = outbuf; | |
308 | for (i = 0; i < len; i += 3) | |
309 | { | |
310 | /* Collect the next three bytes into a number. */ | |
311 | sum = ((long) *inbuf++) << 16; | |
c5aa993b | 312 | sum |= ((long) *inbuf++) << 8; |
c906108c SS |
313 | sum |= ((long) *inbuf++); |
314 | ||
315 | /* Spit out 4 6-bit encodings. */ | |
316 | *p++ = ((sum >> 18) & 0x3f) + '0'; | |
317 | *p++ = ((sum >> 12) & 0x3f) + '0'; | |
c5aa993b | 318 | *p++ = ((sum >> 6) & 0x3f) + '0'; |
c906108c SS |
319 | *p++ = (sum & 0x3f) + '0'; |
320 | } | |
321 | return (p - outbuf); | |
322 | } | |
323 | ||
324 | static int | |
fba45db2 | 325 | fromb64 (char *inbuf, char *outbuf, int len) |
c906108c SS |
326 | { |
327 | int i, sum; | |
328 | ||
329 | if (len % 4 != 0) | |
330 | error ("bad length"); | |
331 | ||
332 | for (i = 0; i < len; i += 4) | |
333 | { | |
334 | /* Collect 4 6-bit digits. */ | |
c5aa993b | 335 | sum = (*inbuf++ - '0') << 18; |
c906108c | 336 | sum |= (*inbuf++ - '0') << 12; |
c5aa993b | 337 | sum |= (*inbuf++ - '0') << 6; |
c906108c SS |
338 | sum |= (*inbuf++ - '0'); |
339 | ||
340 | /* Now take the resulting 24-bit number and get three bytes out | |
341 | of it. */ | |
342 | *outbuf++ = (sum >> 16) & 0xff; | |
c5aa993b | 343 | *outbuf++ = (sum >> 8) & 0xff; |
c906108c SS |
344 | *outbuf++ = sum & 0xff; |
345 | } | |
346 | ||
347 | return (len / 4) * 3; | |
348 | } | |
c906108c | 349 | \f |
c5aa993b | 350 | |
c906108c SS |
351 | /* Tell the remote machine to resume. */ |
352 | ||
353 | static enum target_signal last_sent_signal = TARGET_SIGNAL_0; | |
354 | int last_sent_step; | |
355 | ||
356 | static void | |
fba45db2 | 357 | sds_resume (int pid, int step, enum target_signal siggnal) |
c906108c SS |
358 | { |
359 | unsigned char buf[PBUFSIZ]; | |
360 | ||
e99586d5 | 361 | dcache_invd (sds_dcache); |
c906108c SS |
362 | |
363 | last_sent_signal = siggnal; | |
364 | last_sent_step = step; | |
365 | ||
366 | buf[0] = (step ? 21 : 20); | |
c5aa993b | 367 | buf[1] = 0; /* (should be signal?) */ |
c906108c SS |
368 | |
369 | sds_send (buf, 2); | |
370 | } | |
371 | \f | |
372 | /* Send a message to target to halt it. Target will respond, and send | |
373 | us a message pending notice. */ | |
374 | ||
375 | static void | |
fba45db2 | 376 | sds_interrupt (int signo) |
c906108c SS |
377 | { |
378 | unsigned char buf[PBUFSIZ]; | |
379 | ||
380 | /* If this doesn't work, try more severe steps. */ | |
381 | signal (signo, sds_interrupt_twice); | |
c5aa993b | 382 | |
c906108c | 383 | if (remote_debug) |
9846de1b | 384 | fprintf_unfiltered (gdb_stdlog, "sds_interrupt called\n"); |
c906108c SS |
385 | |
386 | buf[0] = 25; | |
387 | sds_send (buf, 1); | |
388 | } | |
389 | ||
c5aa993b | 390 | static void (*ofunc) (); |
c906108c SS |
391 | |
392 | /* The user typed ^C twice. */ | |
393 | ||
394 | static void | |
fba45db2 | 395 | sds_interrupt_twice (int signo) |
c906108c SS |
396 | { |
397 | signal (signo, ofunc); | |
c5aa993b | 398 | |
c906108c SS |
399 | interrupt_query (); |
400 | ||
401 | signal (signo, sds_interrupt); | |
402 | } | |
403 | ||
404 | /* Ask the user what to do when an interrupt is received. */ | |
405 | ||
406 | static void | |
fba45db2 | 407 | interrupt_query (void) |
c906108c SS |
408 | { |
409 | target_terminal_ours (); | |
410 | ||
411 | if (query ("Interrupted while waiting for the program.\n\ | |
412 | Give up (and stop debugging it)? ")) | |
413 | { | |
414 | target_mourn_inferior (); | |
415 | return_to_top_level (RETURN_QUIT); | |
416 | } | |
417 | ||
418 | target_terminal_inferior (); | |
419 | } | |
420 | ||
421 | /* If nonzero, ignore the next kill. */ | |
422 | int kill_kludge; | |
423 | ||
424 | /* Wait until the remote machine stops, then return, storing status in | |
425 | STATUS just as `wait' would. Returns "pid" (though it's not clear | |
426 | what, if anything, that means in the case of this target). */ | |
427 | ||
428 | static int | |
fba45db2 | 429 | sds_wait (int pid, struct target_waitstatus *status) |
c906108c SS |
430 | { |
431 | unsigned char buf[PBUFSIZ]; | |
432 | int retlen; | |
433 | ||
434 | status->kind = TARGET_WAITKIND_EXITED; | |
435 | status->value.integer = 0; | |
436 | ||
437 | ofunc = (void (*)()) signal (SIGINT, sds_interrupt); | |
438 | ||
439 | signal (SIGINT, ofunc); | |
440 | ||
441 | if (just_started) | |
442 | { | |
443 | just_started = 0; | |
444 | status->kind = TARGET_WAITKIND_STOPPED; | |
445 | return inferior_pid; | |
446 | } | |
447 | ||
448 | while (1) | |
449 | { | |
450 | getmessage (buf, 1); | |
451 | ||
452 | if (message_pending) | |
453 | { | |
454 | buf[0] = 26; | |
455 | retlen = sds_send (buf, 1); | |
456 | if (remote_debug) | |
457 | { | |
9846de1b | 458 | fprintf_unfiltered (gdb_stdlog, "Signals: %02x%02x %02x %02x\n", |
7a292a7a | 459 | buf[0], buf[1], |
c906108c SS |
460 | buf[2], buf[3]); |
461 | } | |
462 | message_pending = 0; | |
463 | status->kind = TARGET_WAITKIND_STOPPED; | |
464 | status->value.sig = TARGET_SIGNAL_TRAP; | |
465 | goto got_status; | |
466 | } | |
467 | } | |
c5aa993b | 468 | got_status: |
c906108c SS |
469 | return inferior_pid; |
470 | } | |
471 | ||
472 | static unsigned char sprs[16]; | |
473 | ||
474 | /* Read the remote registers into the block REGS. */ | |
475 | /* Currently we just read all the registers, so we don't use regno. */ | |
476 | ||
477 | /* ARGSUSED */ | |
478 | static void | |
fba45db2 | 479 | sds_fetch_registers (int regno) |
c906108c SS |
480 | { |
481 | unsigned char buf[PBUFSIZ]; | |
482 | int i, retlen; | |
c906108c SS |
483 | char regs[REGISTER_BYTES]; |
484 | ||
485 | /* Unimplemented registers read as all bits zero. */ | |
486 | memset (regs, 0, REGISTER_BYTES); | |
487 | ||
488 | buf[0] = 18; | |
489 | buf[1] = 1; | |
490 | buf[2] = 0; | |
491 | retlen = sds_send (buf, 3); | |
492 | ||
493 | for (i = 0; i < 4 * 6; ++i) | |
494 | regs[i + 4 * 32 + 8 * 32] = buf[i]; | |
495 | for (i = 0; i < 4 * 4; ++i) | |
496 | sprs[i] = buf[i + 4 * 7]; | |
497 | ||
498 | buf[0] = 18; | |
499 | buf[1] = 2; | |
500 | buf[2] = 0; | |
501 | retlen = sds_send (buf, 3); | |
502 | ||
503 | for (i = 0; i < retlen; i++) | |
504 | regs[i] = buf[i]; | |
505 | ||
506 | /* (should warn about reply too short) */ | |
507 | ||
508 | for (i = 0; i < NUM_REGS; i++) | |
c5aa993b | 509 | supply_register (i, ®s[REGISTER_BYTE (i)]); |
c906108c SS |
510 | } |
511 | ||
512 | /* Prepare to store registers. Since we may send them all, we have to | |
513 | read out the ones we don't want to change first. */ | |
514 | ||
c5aa993b | 515 | static void |
fba45db2 | 516 | sds_prepare_to_store (void) |
c906108c SS |
517 | { |
518 | /* Make sure the entire registers array is valid. */ | |
c5aa993b | 519 | read_register_bytes (0, (char *) NULL, REGISTER_BYTES); |
c906108c SS |
520 | } |
521 | ||
522 | /* Store register REGNO, or all registers if REGNO == -1, from the contents | |
523 | of REGISTERS. FIXME: ignores errors. */ | |
524 | ||
525 | static void | |
fba45db2 | 526 | sds_store_registers (int regno) |
c906108c SS |
527 | { |
528 | unsigned char *p, buf[PBUFSIZ]; | |
529 | int i; | |
530 | ||
531 | /* Store all the special-purpose registers. */ | |
532 | p = buf; | |
533 | *p++ = 19; | |
534 | *p++ = 1; | |
535 | *p++ = 0; | |
536 | *p++ = 0; | |
537 | for (i = 0; i < 4 * 6; i++) | |
538 | *p++ = registers[i + 4 * 32 + 8 * 32]; | |
539 | for (i = 0; i < 4 * 1; i++) | |
540 | *p++ = 0; | |
541 | for (i = 0; i < 4 * 4; i++) | |
542 | *p++ = sprs[i]; | |
543 | ||
544 | sds_send (buf, p - buf); | |
545 | ||
546 | /* Store all the general-purpose registers. */ | |
547 | p = buf; | |
548 | *p++ = 19; | |
549 | *p++ = 2; | |
550 | *p++ = 0; | |
551 | *p++ = 0; | |
552 | for (i = 0; i < 4 * 32; i++) | |
553 | *p++ = registers[i]; | |
554 | ||
555 | sds_send (buf, p - buf); | |
556 | ||
557 | } | |
558 | \f | |
559 | /* Write memory data directly to the remote machine. This does not | |
560 | inform the data cache; the data cache uses this. MEMADDR is the | |
561 | address in the remote memory space. MYADDR is the address of the | |
562 | buffer in our space. LEN is the number of bytes. | |
563 | ||
564 | Returns number of bytes transferred, or 0 for error. */ | |
565 | ||
566 | static int | |
fba45db2 | 567 | sds_write_bytes (CORE_ADDR memaddr, char *myaddr, int len) |
c906108c SS |
568 | { |
569 | int max_buf_size; /* Max size of packet output buffer */ | |
570 | int origlen; | |
571 | unsigned char buf[PBUFSIZ]; | |
572 | int todo; | |
573 | int i; | |
574 | ||
575 | /* Chop the transfer down if necessary */ | |
576 | ||
577 | max_buf_size = 150; | |
578 | ||
579 | origlen = len; | |
580 | while (len > 0) | |
581 | { | |
582 | todo = min (len, max_buf_size); | |
583 | ||
584 | buf[0] = 13; | |
585 | buf[1] = 0; | |
586 | buf[2] = (int) (memaddr >> 24) & 0xff; | |
587 | buf[3] = (int) (memaddr >> 16) & 0xff; | |
c5aa993b JM |
588 | buf[4] = (int) (memaddr >> 8) & 0xff; |
589 | buf[5] = (int) (memaddr) & 0xff; | |
c906108c SS |
590 | buf[6] = 1; |
591 | buf[7] = 0; | |
592 | ||
593 | for (i = 0; i < todo; i++) | |
594 | buf[i + 8] = myaddr[i]; | |
595 | ||
596 | sds_send (buf, 8 + todo); | |
597 | ||
598 | /* (should look at result) */ | |
599 | ||
600 | myaddr += todo; | |
601 | memaddr += todo; | |
602 | len -= todo; | |
603 | } | |
604 | return origlen; | |
605 | } | |
606 | ||
607 | /* Read memory data directly from the remote machine. This does not | |
608 | use the data cache; the data cache uses this. MEMADDR is the | |
609 | address in the remote memory space. MYADDR is the address of the | |
610 | buffer in our space. LEN is the number of bytes. | |
611 | ||
612 | Returns number of bytes transferred, or 0 for error. */ | |
613 | ||
614 | static int | |
fba45db2 | 615 | sds_read_bytes (CORE_ADDR memaddr, char *myaddr, int len) |
c906108c SS |
616 | { |
617 | int max_buf_size; /* Max size of packet output buffer */ | |
618 | int origlen, retlen; | |
619 | unsigned char buf[PBUFSIZ]; | |
620 | int todo; | |
621 | int i; | |
622 | ||
623 | /* Chop the transfer down if necessary */ | |
624 | ||
625 | max_buf_size = 150; | |
626 | ||
627 | origlen = len; | |
628 | while (len > 0) | |
629 | { | |
630 | todo = min (len, max_buf_size); | |
631 | ||
632 | buf[0] = 12; | |
633 | buf[1] = 0; | |
634 | buf[2] = (int) (memaddr >> 24) & 0xff; | |
635 | buf[3] = (int) (memaddr >> 16) & 0xff; | |
c5aa993b JM |
636 | buf[4] = (int) (memaddr >> 8) & 0xff; |
637 | buf[5] = (int) (memaddr) & 0xff; | |
c906108c | 638 | buf[6] = (int) (todo >> 8) & 0xff; |
c5aa993b | 639 | buf[7] = (int) (todo) & 0xff; |
c906108c SS |
640 | buf[8] = 1; |
641 | ||
642 | retlen = sds_send (buf, 9); | |
643 | ||
644 | if (retlen - 2 != todo) | |
645 | { | |
646 | return 0; | |
647 | } | |
648 | ||
649 | /* Reply describes memory byte by byte. */ | |
650 | ||
651 | for (i = 0; i < todo; i++) | |
652 | myaddr[i] = buf[i + 2]; | |
653 | ||
654 | myaddr += todo; | |
655 | memaddr += todo; | |
656 | len -= todo; | |
657 | } | |
658 | ||
659 | return origlen; | |
660 | } | |
661 | \f | |
662 | /* Read or write LEN bytes from inferior memory at MEMADDR, | |
663 | transferring to or from debugger address MYADDR. Write to inferior | |
664 | if SHOULD_WRITE is nonzero. Returns length of data written or | |
665 | read; 0 for error. */ | |
666 | ||
667 | /* ARGSUSED */ | |
668 | static int | |
c5aa993b | 669 | sds_xfer_memory (memaddr, myaddr, len, should_write, target) |
c906108c SS |
670 | CORE_ADDR memaddr; |
671 | char *myaddr; | |
672 | int len; | |
673 | int should_write; | |
c5aa993b | 674 | struct target_ops *target; /* ignored */ |
c906108c SS |
675 | { |
676 | return dcache_xfer_memory (sds_dcache, memaddr, myaddr, len, should_write); | |
677 | } | |
c906108c | 678 | \f |
c5aa993b | 679 | |
c906108c | 680 | static void |
fba45db2 | 681 | sds_files_info (struct target_ops *ignore) |
c906108c SS |
682 | { |
683 | puts_filtered ("Debugging over a serial connection, using SDS protocol.\n"); | |
684 | } | |
685 | \f | |
686 | /* Stuff for dealing with the packets which are part of this protocol. | |
687 | See comment at top of file for details. */ | |
688 | ||
689 | /* Read a single character from the remote end, masking it down to 7 bits. */ | |
690 | ||
691 | static int | |
fba45db2 | 692 | readchar (int timeout) |
c906108c SS |
693 | { |
694 | int ch; | |
695 | ||
696 | ch = SERIAL_READCHAR (sds_desc, timeout); | |
697 | ||
698 | if (remote_debug > 1 && ch >= 0) | |
9846de1b | 699 | fprintf_unfiltered (gdb_stdlog, "%c(%x)", ch, ch); |
c906108c SS |
700 | |
701 | switch (ch) | |
702 | { | |
703 | case SERIAL_EOF: | |
704 | error ("Remote connection closed"); | |
705 | case SERIAL_ERROR: | |
706 | perror_with_name ("Remote communication error"); | |
707 | case SERIAL_TIMEOUT: | |
708 | return ch; | |
709 | default: | |
710 | return ch & 0x7f; | |
711 | } | |
712 | } | |
713 | ||
714 | /* An SDS-style checksum is a sum of the bytes modulo 253. (Presumably | |
715 | because 253, 254, and 255 are special flags in the protocol.) */ | |
716 | ||
717 | static int | |
fba45db2 | 718 | compute_checksum (int csum, char *buf, int len) |
c906108c SS |
719 | { |
720 | int i; | |
721 | ||
722 | for (i = 0; i < len; ++i) | |
723 | csum += (unsigned char) buf[i]; | |
724 | ||
725 | csum %= 253; | |
726 | return csum; | |
727 | } | |
728 | ||
729 | /* Send the command in BUF to the remote machine, and read the reply | |
730 | into BUF also. */ | |
731 | ||
732 | static int | |
fba45db2 | 733 | sds_send (unsigned char *buf, int len) |
c906108c SS |
734 | { |
735 | putmessage (buf, len); | |
736 | ||
737 | return getmessage (buf, 0); | |
738 | } | |
739 | ||
740 | /* Send a message to the remote machine. */ | |
741 | ||
742 | static int | |
fba45db2 | 743 | putmessage (unsigned char *buf, int len) |
c906108c SS |
744 | { |
745 | int i, enclen; | |
746 | unsigned char csum = 0; | |
747 | char buf2[PBUFSIZ], buf3[PBUFSIZ]; | |
748 | unsigned char header[3]; | |
c906108c SS |
749 | char *p; |
750 | ||
751 | /* Copy the packet into buffer BUF2, encapsulating it | |
752 | and giving it a checksum. */ | |
753 | ||
754 | if (len > 170) /* Prosanity check */ | |
c5aa993b | 755 | abort (); |
c906108c SS |
756 | |
757 | if (remote_debug) | |
758 | { | |
9846de1b | 759 | fprintf_unfiltered (gdb_stdlog, "Message to send: \""); |
c906108c | 760 | for (i = 0; i < len; ++i) |
9846de1b JM |
761 | fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); |
762 | fprintf_unfiltered (gdb_stdlog, "\"\n"); | |
c906108c SS |
763 | } |
764 | ||
765 | p = buf2; | |
766 | *p++ = '$'; | |
767 | ||
768 | if (len % 3 != 0) | |
769 | { | |
770 | buf[len] = '\0'; | |
c5aa993b | 771 | buf[len + 1] = '\0'; |
c906108c SS |
772 | } |
773 | ||
774 | header[1] = next_msg_id; | |
775 | ||
776 | header[2] = len; | |
777 | ||
778 | csum = compute_checksum (csum, buf, len); | |
779 | csum = compute_checksum (csum, header + 1, 2); | |
780 | ||
781 | header[0] = csum; | |
782 | ||
783 | tob64 (header, p, 3); | |
784 | p += 4; | |
785 | enclen = tob64 (buf, buf3, ((len + 2) / 3) * 3); | |
786 | ||
787 | for (i = 0; i < enclen; ++i) | |
788 | *p++ = buf3[i]; | |
789 | *p++ = '\r'; | |
790 | *p++ = '\n'; | |
791 | ||
792 | next_msg_id = (next_msg_id + 3) % 245; | |
793 | ||
794 | /* Send it over and over until we get a positive ack. */ | |
795 | ||
796 | while (1) | |
797 | { | |
c906108c SS |
798 | if (remote_debug) |
799 | { | |
800 | *p = '\0'; | |
9846de1b JM |
801 | fprintf_unfiltered (gdb_stdlog, "Sending encoded: \"%s\"", buf2); |
802 | fprintf_unfiltered (gdb_stdlog, | |
803 | " (Checksum %d, id %d, length %d)\n", | |
804 | header[0], header[1], header[2]); | |
805 | gdb_flush (gdb_stdlog); | |
c906108c SS |
806 | } |
807 | if (SERIAL_WRITE (sds_desc, buf2, p - buf2)) | |
808 | perror_with_name ("putmessage: write failed"); | |
809 | ||
810 | return 1; | |
c906108c | 811 | } |
c906108c SS |
812 | } |
813 | ||
814 | /* Come here after finding the start of the frame. Collect the rest | |
815 | into BUF. Returns 0 on any error, 1 on success. */ | |
816 | ||
817 | static int | |
fba45db2 | 818 | read_frame (char *buf) |
c906108c SS |
819 | { |
820 | char *bp; | |
821 | int c; | |
822 | ||
823 | bp = buf; | |
824 | ||
825 | while (1) | |
826 | { | |
827 | c = readchar (sds_timeout); | |
828 | ||
829 | switch (c) | |
830 | { | |
831 | case SERIAL_TIMEOUT: | |
832 | if (remote_debug) | |
9846de1b | 833 | fputs_filtered ("Timeout in mid-message, retrying\n", gdb_stdlog); |
c906108c SS |
834 | return 0; |
835 | case '$': | |
836 | if (remote_debug) | |
9846de1b JM |
837 | fputs_filtered ("Saw new packet start in middle of old one\n", |
838 | gdb_stdlog); | |
c906108c SS |
839 | return 0; /* Start a new packet, count retries */ |
840 | case '\r': | |
841 | break; | |
842 | ||
843 | case '\n': | |
844 | { | |
845 | *bp = '\000'; | |
846 | if (remote_debug) | |
9846de1b | 847 | fprintf_unfiltered (gdb_stdlog, "Received encoded: \"%s\"\n", |
c906108c SS |
848 | buf); |
849 | return 1; | |
850 | } | |
851 | ||
852 | default: | |
853 | if (bp < buf + PBUFSIZ - 1) | |
854 | { | |
855 | *bp++ = c; | |
856 | continue; | |
857 | } | |
858 | ||
859 | *bp = '\0'; | |
860 | puts_filtered ("Message too long: "); | |
861 | puts_filtered (buf); | |
862 | puts_filtered ("\n"); | |
863 | ||
864 | return 0; | |
865 | } | |
866 | } | |
867 | } | |
868 | ||
869 | /* Read a packet from the remote machine, with error checking, | |
870 | and store it in BUF. BUF is expected to be of size PBUFSIZ. | |
871 | If FOREVER, wait forever rather than timing out; this is used | |
872 | while the target is executing user code. */ | |
873 | ||
874 | static int | |
fba45db2 | 875 | getmessage (unsigned char *buf, int forever) |
c906108c SS |
876 | { |
877 | int c, c2, c3; | |
878 | int tries; | |
879 | int timeout; | |
880 | int val, i, len, csum; | |
881 | unsigned char header[3]; | |
882 | unsigned char inbuf[500]; | |
883 | ||
884 | strcpy (buf, "timeout"); | |
885 | ||
886 | if (forever) | |
887 | { | |
c906108c | 888 | timeout = watchdog > 0 ? watchdog : -1; |
c906108c SS |
889 | } |
890 | ||
891 | else | |
892 | timeout = sds_timeout; | |
893 | ||
894 | #define MAX_TRIES 3 | |
895 | ||
896 | for (tries = 1; tries <= MAX_TRIES; tries++) | |
897 | { | |
898 | /* This can loop forever if the remote side sends us characters | |
c5aa993b JM |
899 | continuously, but if it pauses, we'll get a zero from readchar |
900 | because of timeout. Then we'll count that as a retry. */ | |
c906108c SS |
901 | |
902 | /* Note that we will only wait forever prior to the start of a packet. | |
c5aa993b JM |
903 | After that, we expect characters to arrive at a brisk pace. They |
904 | should show up within sds_timeout intervals. */ | |
c906108c SS |
905 | |
906 | do | |
907 | { | |
908 | c = readchar (timeout); | |
909 | ||
910 | if (c == SERIAL_TIMEOUT) | |
911 | { | |
c906108c SS |
912 | if (forever) /* Watchdog went off. Kill the target. */ |
913 | { | |
914 | target_mourn_inferior (); | |
915 | error ("Watchdog has expired. Target detached.\n"); | |
916 | } | |
c906108c | 917 | if (remote_debug) |
9846de1b | 918 | fputs_filtered ("Timed out.\n", gdb_stdlog); |
c906108c SS |
919 | goto retry; |
920 | } | |
921 | } | |
922 | while (c != '$' && c != '{'); | |
923 | ||
924 | /* We might have seen a "trigraph", a sequence of three characters | |
c5aa993b | 925 | that indicate various sorts of communication state. */ |
c906108c SS |
926 | |
927 | if (c == '{') | |
928 | { | |
929 | /* Read the other two chars of the trigraph. */ | |
930 | c2 = readchar (timeout); | |
931 | c3 = readchar (timeout); | |
932 | if (remote_debug) | |
9846de1b | 933 | fprintf_unfiltered (gdb_stdlog, "Trigraph %c%c%c received\n", |
c906108c SS |
934 | c, c2, c3); |
935 | if (c3 == '+') | |
936 | { | |
937 | message_pending = 1; | |
c5aa993b | 938 | return 0; /*???? */ |
c906108c SS |
939 | } |
940 | continue; | |
941 | } | |
942 | ||
943 | val = read_frame (inbuf); | |
944 | ||
945 | if (val == 1) | |
946 | { | |
947 | fromb64 (inbuf, header, 4); | |
948 | /* (should check out other bits) */ | |
949 | fromb64 (inbuf + 4, buf, strlen (inbuf) - 4); | |
950 | ||
951 | len = header[2]; | |
952 | ||
953 | csum = 0; | |
954 | csum = compute_checksum (csum, buf, len); | |
955 | csum = compute_checksum (csum, header + 1, 2); | |
956 | ||
957 | if (csum != header[0]) | |
958 | fprintf_unfiltered (gdb_stderr, | |
c5aa993b | 959 | "Checksum mismatch: computed %d, received %d\n", |
c906108c SS |
960 | csum, header[0]); |
961 | ||
962 | if (header[2] == 0xff) | |
963 | fprintf_unfiltered (gdb_stderr, "Requesting resend...\n"); | |
964 | ||
965 | if (remote_debug) | |
966 | { | |
9846de1b | 967 | fprintf_unfiltered (gdb_stdlog, |
c5aa993b | 968 | "... (Got checksum %d, id %d, length %d)\n", |
c906108c | 969 | header[0], header[1], header[2]); |
9846de1b | 970 | fprintf_unfiltered (gdb_stdlog, "Message received: \""); |
c906108c SS |
971 | for (i = 0; i < len; ++i) |
972 | { | |
9846de1b | 973 | fprintf_unfiltered (gdb_stdlog, "%02x", (unsigned char) buf[i]); |
c906108c | 974 | } |
9846de1b | 975 | fprintf_unfiltered (gdb_stdlog, "\"\n"); |
c906108c SS |
976 | } |
977 | ||
978 | /* no ack required? */ | |
979 | return len; | |
980 | } | |
981 | ||
982 | /* Try the whole thing again. */ | |
983 | retry: | |
984 | /* need to do something here */ | |
985 | } | |
986 | ||
987 | /* We have tried hard enough, and just can't receive the packet. Give up. */ | |
988 | ||
989 | printf_unfiltered ("Ignoring packet error, continuing...\n"); | |
990 | return 0; | |
991 | } | |
992 | \f | |
993 | static void | |
fba45db2 | 994 | sds_kill (void) |
c906108c SS |
995 | { |
996 | /* Don't try to do anything to the target. */ | |
997 | } | |
998 | ||
999 | static void | |
fba45db2 | 1000 | sds_mourn (void) |
c906108c SS |
1001 | { |
1002 | unpush_target (&sds_ops); | |
1003 | generic_mourn_inferior (); | |
1004 | } | |
1005 | ||
1006 | static void | |
fba45db2 | 1007 | sds_create_inferior (char *exec_file, char *args, char **env) |
c906108c SS |
1008 | { |
1009 | inferior_pid = 42000; | |
1010 | ||
1011 | /* Clean up from the last time we were running. */ | |
1012 | clear_proceed_status (); | |
1013 | ||
1014 | /* Let the remote process run. */ | |
1015 | proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0); | |
1016 | } | |
1017 | ||
1018 | static void | |
fba45db2 | 1019 | sds_load (char *filename, int from_tty) |
c906108c SS |
1020 | { |
1021 | generic_load (filename, from_tty); | |
1022 | ||
1023 | inferior_pid = 0; | |
1024 | } | |
1025 | \f | |
1026 | /* The SDS monitor has commands for breakpoint insertion, although it | |
1027 | it doesn't actually manage the breakpoints, it just returns the | |
1028 | replaced instruction back to the debugger. */ | |
1029 | ||
1030 | static int | |
fba45db2 | 1031 | sds_insert_breakpoint (CORE_ADDR addr, char *contents_cache) |
c906108c SS |
1032 | { |
1033 | int i, retlen; | |
1034 | unsigned char *p, buf[PBUFSIZ]; | |
1035 | ||
1036 | p = buf; | |
1037 | *p++ = 16; | |
1038 | *p++ = 0; | |
1039 | *p++ = (int) (addr >> 24) & 0xff; | |
1040 | *p++ = (int) (addr >> 16) & 0xff; | |
c5aa993b JM |
1041 | *p++ = (int) (addr >> 8) & 0xff; |
1042 | *p++ = (int) (addr) & 0xff; | |
1043 | ||
c906108c SS |
1044 | retlen = sds_send (buf, p - buf); |
1045 | ||
1046 | for (i = 0; i < 4; ++i) | |
1047 | contents_cache[i] = buf[i + 2]; | |
1048 | ||
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | static int | |
fba45db2 | 1053 | sds_remove_breakpoint (CORE_ADDR addr, char *contents_cache) |
c906108c SS |
1054 | { |
1055 | int i, retlen; | |
1056 | unsigned char *p, buf[PBUFSIZ]; | |
1057 | ||
1058 | p = buf; | |
1059 | *p++ = 17; | |
1060 | *p++ = 0; | |
1061 | *p++ = (int) (addr >> 24) & 0xff; | |
1062 | *p++ = (int) (addr >> 16) & 0xff; | |
c5aa993b JM |
1063 | *p++ = (int) (addr >> 8) & 0xff; |
1064 | *p++ = (int) (addr) & 0xff; | |
c906108c SS |
1065 | for (i = 0; i < 4; ++i) |
1066 | *p++ = contents_cache[i]; | |
1067 | ||
1068 | retlen = sds_send (buf, p - buf); | |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | \f | |
c5aa993b | 1073 | static void |
fba45db2 | 1074 | init_sds_ops (void) |
c906108c SS |
1075 | { |
1076 | sds_ops.to_shortname = "sds"; | |
1077 | sds_ops.to_longname = "Remote serial target with SDS protocol"; | |
1078 | sds_ops.to_doc = "Use a remote computer via a serial line; using the SDS protocol.\n\ | |
1079 | Specify the serial device it is connected to (e.g. /dev/ttya)."; | |
1080 | sds_ops.to_open = sds_open; | |
1081 | sds_ops.to_close = sds_close; | |
1082 | sds_ops.to_detach = sds_detach; | |
1083 | sds_ops.to_resume = sds_resume; | |
1084 | sds_ops.to_wait = sds_wait; | |
1085 | sds_ops.to_fetch_registers = sds_fetch_registers; | |
1086 | sds_ops.to_store_registers = sds_store_registers; | |
1087 | sds_ops.to_prepare_to_store = sds_prepare_to_store; | |
1088 | sds_ops.to_xfer_memory = sds_xfer_memory; | |
1089 | sds_ops.to_files_info = sds_files_info; | |
1090 | sds_ops.to_insert_breakpoint = sds_insert_breakpoint; | |
1091 | sds_ops.to_remove_breakpoint = sds_remove_breakpoint; | |
1092 | sds_ops.to_kill = sds_kill; | |
1093 | sds_ops.to_load = sds_load; | |
1094 | sds_ops.to_create_inferior = sds_create_inferior; | |
1095 | sds_ops.to_mourn_inferior = sds_mourn; | |
1096 | sds_ops.to_stratum = process_stratum; | |
1097 | sds_ops.to_has_all_memory = 1; | |
1098 | sds_ops.to_has_memory = 1; | |
1099 | sds_ops.to_has_stack = 1; | |
1100 | sds_ops.to_has_registers = 1; | |
1101 | sds_ops.to_has_execution = 1; | |
1102 | sds_ops.to_magic = OPS_MAGIC; | |
1103 | } | |
1104 | ||
1105 | /* Put a command string, in args, out to the monitor and display the | |
1106 | reply message. */ | |
1107 | ||
1108 | static void | |
fba45db2 | 1109 | sds_command (char *args, int from_tty) |
c906108c SS |
1110 | { |
1111 | char *p; | |
1112 | int i, len, retlen; | |
1113 | unsigned char buf[1000]; | |
1114 | ||
1115 | /* Convert hexadecimal chars into a byte buffer. */ | |
1116 | p = args; | |
1117 | len = 0; | |
1118 | while (*p != '\0') | |
1119 | { | |
1120 | buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]); | |
1121 | if (p[1] == '\0') | |
1122 | break; | |
1123 | p += 2; | |
1124 | } | |
1125 | ||
1126 | retlen = sds_send (buf, len); | |
1127 | ||
1128 | printf_filtered ("Reply is "); | |
1129 | for (i = 0; i < retlen; ++i) | |
1130 | { | |
1131 | printf_filtered ("%02x", buf[i]); | |
c5aa993b | 1132 | } |
c906108c SS |
1133 | printf_filtered ("\n"); |
1134 | } | |
1135 | ||
1136 | void | |
fba45db2 | 1137 | _initialize_remote_sds (void) |
c906108c SS |
1138 | { |
1139 | init_sds_ops (); | |
1140 | add_target (&sds_ops); | |
1141 | ||
1142 | add_show_from_set (add_set_cmd ("sdstimeout", no_class, | |
c5aa993b JM |
1143 | var_integer, (char *) &sds_timeout, |
1144 | "Set timeout value for sds read.\n", &setlist), | |
c906108c SS |
1145 | &showlist); |
1146 | ||
1147 | add_com ("sds", class_obscure, sds_command, | |
c5aa993b | 1148 | "Send a command to the SDS monitor."); |
c906108c | 1149 | } |