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