Commit | Line | Data |
---|---|---|
55488e9e | 1 | /* Remote debugging interface for Tandem ST2000 phone switch, for GDB. |
88cc9a36 SG |
2 | Copyright 1990, 1991, 1992 Free Software Foundation, Inc. |
3 | Contributed by Cygnus Support. Written by Jim Kingdon for Cygnus. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
20 | ||
55488e9e SG |
21 | /* This file was derived from remote-eb.c, which did a similar job, but for |
22 | an AMD-29K running EBMON. That file was in turn derived from remote.c | |
23 | as mentioned in the following comment (left in for comic relief): | |
24 | ||
25 | "This is like remote.c but is for an esoteric situation-- | |
88cc9a36 SG |
26 | having a 29k board in a PC hooked up to a unix machine with |
27 | a serial line, and running ctty com1 on the PC, through which | |
28 | the unix machine can run ebmon. Not to mention that the PC | |
29 | has PC/NFS, so it can access the same executables that gdb can, | |
55488e9e | 30 | over the net in real time." |
88cc9a36 | 31 | |
55488e9e SG |
32 | In reality, this module talks to a debug monitor called 'STDEBUG', which |
33 | runs in a phone switch. We communicate with STDEBUG via either a direct | |
34 | serial line, or a TCP (or possibly TELNET) stream to a terminal multiplexor, | |
35 | which in turn talks to the phone switch. */ | |
88cc9a36 | 36 | |
55488e9e SG |
37 | #include "defs.h" |
38 | #include "gdbcore.h" | |
88cc9a36 SG |
39 | #include "terminal.h" |
40 | #include "target.h" | |
55488e9e SG |
41 | #include "wait.h" |
42 | #include <varargs.h> | |
43 | #include <signal.h> | |
44 | #include <string.h> | |
88cc9a36 | 45 | |
55488e9e | 46 | extern struct target_ops st2000_ops; /* Forward declaration */ |
88cc9a36 | 47 | |
55488e9e SG |
48 | static void st2000_close(); |
49 | static void st2000_fetch_register(); | |
50 | static void st2000_store_register(); | |
88cc9a36 | 51 | |
55488e9e | 52 | #define LOG_FILE "st2000.log" |
88cc9a36 SG |
53 | #if defined (LOG_FILE) |
54 | FILE *log_file; | |
55 | #endif | |
56 | ||
57 | static int timeout = 24; | |
58 | ||
59 | /* Descriptor for I/O to remote machine. Initialize it to -1 so that | |
55488e9e | 60 | st2000_open knows that we don't have a file open when the program |
88cc9a36 | 61 | starts. */ |
55488e9e SG |
62 | int st2000_desc = -1; |
63 | ||
64 | /* stream which is fdopen'd from st2000_desc. Only valid when | |
65 | st2000_desc != -1. */ | |
66 | FILE *st2000_stream; | |
88cc9a36 | 67 | |
55488e9e SG |
68 | /* Send data to stdebug. Works just like printf. */ |
69 | ||
70 | static void | |
71 | printf_stdebug(va_alist) | |
72 | va_dcl | |
73 | { | |
74 | va_list args; | |
75 | char *pattern; | |
76 | ||
77 | va_start(args); | |
78 | ||
79 | pattern = va_arg(args, char *); | |
80 | ||
81 | vfprintf(st2000_stream, pattern, args); | |
82 | fflush(st2000_stream); | |
83 | } | |
88cc9a36 SG |
84 | |
85 | /* Read a character from the remote system, doing all the fancy | |
86 | timeout stuff. */ | |
87 | static int | |
88 | readchar () | |
89 | { | |
90 | char buf; | |
91 | ||
92 | buf = '\0'; | |
93 | #ifdef HAVE_TERMIO | |
94 | /* termio does the timeout for us. */ | |
55488e9e | 95 | read (st2000_desc, &buf, 1); |
88cc9a36 SG |
96 | #else |
97 | alarm (timeout); | |
55488e9e | 98 | if (read (st2000_desc, &buf, 1) < 0) |
88cc9a36 SG |
99 | { |
100 | if (errno == EINTR) | |
101 | error ("Timeout reading from remote system."); | |
102 | else | |
103 | perror_with_name ("remote"); | |
104 | } | |
105 | alarm (0); | |
106 | #endif | |
107 | ||
108 | if (buf == '\0') | |
109 | error ("Timeout reading from remote system."); | |
110 | #if defined (LOG_FILE) | |
111 | putc (buf & 0x7f, log_file); | |
112 | #endif | |
113 | return buf & 0x7f; | |
114 | } | |
115 | ||
116 | /* Keep discarding input from the remote system, until STRING is found. | |
117 | Let the user break out immediately. */ | |
118 | static void | |
119 | expect (string) | |
120 | char *string; | |
121 | { | |
122 | char *p = string; | |
123 | ||
124 | immediate_quit = 1; | |
125 | while (1) | |
126 | { | |
127 | if (readchar() == *p) | |
128 | { | |
129 | p++; | |
130 | if (*p == '\0') | |
131 | { | |
132 | immediate_quit = 0; | |
133 | return; | |
134 | } | |
135 | } | |
136 | else | |
137 | p = string; | |
138 | } | |
139 | } | |
140 | ||
55488e9e | 141 | /* Keep discarding input until we see the STDEBUG prompt. |
88cc9a36 SG |
142 | |
143 | The convention for dealing with the prompt is that you | |
144 | o give your command | |
145 | o *then* wait for the prompt. | |
146 | ||
147 | Thus the last thing that a procedure does with the serial line | |
55488e9e | 148 | will be an expect_prompt(). Exception: st2000_resume does not |
88cc9a36 SG |
149 | wait for the prompt, because the terminal is being handed over |
150 | to the inferior. However, the next thing which happens after that | |
55488e9e | 151 | is a st2000_wait which does wait for the prompt. |
88cc9a36 SG |
152 | Note that this includes abnormal exit, e.g. error(). This is |
153 | necessary to prevent getting into states from which we can't | |
154 | recover. */ | |
155 | static void | |
156 | expect_prompt () | |
157 | { | |
158 | #if defined (LOG_FILE) | |
159 | /* This is a convenient place to do this. The idea is to do it often | |
160 | enough that we never lose much data if we terminate abnormally. */ | |
161 | fflush (log_file); | |
162 | #endif | |
55488e9e | 163 | expect ("dbug> "); |
88cc9a36 SG |
164 | } |
165 | ||
166 | /* Get a hex digit from the remote system & return its value. | |
167 | If ignore_space is nonzero, ignore spaces (not newline, tab, etc). */ | |
168 | static int | |
169 | get_hex_digit (ignore_space) | |
170 | int ignore_space; | |
171 | { | |
172 | int ch; | |
173 | while (1) | |
174 | { | |
175 | ch = readchar (); | |
176 | if (ch >= '0' && ch <= '9') | |
177 | return ch - '0'; | |
178 | else if (ch >= 'A' && ch <= 'F') | |
179 | return ch - 'A' + 10; | |
180 | else if (ch >= 'a' && ch <= 'f') | |
181 | return ch - 'a' + 10; | |
182 | else if (ch == ' ' && ignore_space) | |
183 | ; | |
184 | else | |
185 | { | |
186 | expect_prompt (); | |
187 | error ("Invalid hex digit from remote system."); | |
188 | } | |
189 | } | |
190 | } | |
191 | ||
55488e9e | 192 | /* Get a byte from st2000_desc and put it in *BYT. Accept any number |
88cc9a36 SG |
193 | leading spaces. */ |
194 | static void | |
195 | get_hex_byte (byt) | |
196 | char *byt; | |
197 | { | |
198 | int val; | |
199 | ||
200 | val = get_hex_digit (1) << 4; | |
201 | val |= get_hex_digit (0); | |
202 | *byt = val; | |
203 | } | |
204 | ||
205 | /* Get N 32-bit words from remote, each preceded by a space, | |
206 | and put them in registers starting at REGNO. */ | |
207 | static void | |
208 | get_hex_regs (n, regno) | |
209 | int n; | |
210 | int regno; | |
211 | { | |
212 | long val; | |
213 | int i; | |
214 | ||
215 | for (i = 0; i < n; i++) | |
216 | { | |
217 | int j; | |
218 | ||
219 | val = 0; | |
220 | for (j = 0; j < 8; j++) | |
221 | val = (val << 4) + get_hex_digit (j == 0); | |
55488e9e | 222 | supply_register (regno++, (char *) &val); |
88cc9a36 SG |
223 | } |
224 | } | |
225 | ||
226 | /* Called when SIGALRM signal sent due to alarm() timeout. */ | |
227 | #ifndef HAVE_TERMIO | |
228 | ||
229 | #ifndef __STDC__ | |
230 | #define volatile /**/ | |
231 | #endif | |
232 | volatile int n_alarms; | |
233 | ||
55488e9e SG |
234 | static void |
235 | st2000_timer () | |
88cc9a36 | 236 | { |
88cc9a36 SG |
237 | n_alarms++; |
238 | } | |
239 | #endif | |
240 | ||
88cc9a36 SG |
241 | /* This is called not only when we first attach, but also when the |
242 | user types "run" after having attached. */ | |
243 | static void | |
55488e9e | 244 | st2000_create_inferior (execfile, args, env) |
88cc9a36 SG |
245 | char *execfile; |
246 | char *args; | |
247 | char **env; | |
248 | { | |
249 | int entry_pt; | |
250 | ||
251 | if (args && *args) | |
55488e9e | 252 | error ("Can't pass arguments to remote STDEBUG process"); |
88cc9a36 SG |
253 | |
254 | if (execfile == 0 || exec_bfd == 0) | |
255 | error ("No exec file specified"); | |
256 | ||
257 | entry_pt = (int) bfd_get_start_address (exec_bfd); | |
258 | ||
259 | #ifdef CREATE_INFERIOR_HOOK | |
260 | CREATE_INFERIOR_HOOK (0); /* No process-ID */ | |
261 | #endif | |
262 | ||
88cc9a36 SG |
263 | /* The "process" (board) is already stopped awaiting our commands, and |
264 | the program is already downloaded. We just set its PC and go. */ | |
265 | ||
266 | clear_proceed_status (); | |
267 | ||
268 | /* Tell wait_for_inferior that we've started a new process. */ | |
269 | init_wait_for_inferior (); | |
270 | ||
271 | /* Set up the "saved terminal modes" of the inferior | |
272 | based on what modes we are starting it with. */ | |
273 | target_terminal_init (); | |
274 | ||
275 | /* Install inferior's terminal modes. */ | |
276 | target_terminal_inferior (); | |
277 | ||
278 | /* insert_step_breakpoint (); FIXME, do we need this? */ | |
279 | proceed ((CORE_ADDR)entry_pt, -1, 0); /* Let 'er rip... */ | |
280 | } | |
281 | ||
282 | /* Translate baud rates from integers to damn B_codes. Unix should | |
283 | have outgrown this crap years ago, but even POSIX wouldn't buck it. */ | |
284 | ||
285 | #ifndef B19200 | |
286 | #define B19200 EXTA | |
287 | #endif | |
288 | #ifndef B38400 | |
289 | #define B38400 EXTB | |
290 | #endif | |
291 | ||
55488e9e | 292 | static struct {int rate, damn_b;} baudtab[] = { |
88cc9a36 SG |
293 | {0, B0}, |
294 | {50, B50}, | |
295 | {75, B75}, | |
296 | {110, B110}, | |
297 | {134, B134}, | |
298 | {150, B150}, | |
299 | {200, B200}, | |
300 | {300, B300}, | |
301 | {600, B600}, | |
302 | {1200, B1200}, | |
303 | {1800, B1800}, | |
304 | {2400, B2400}, | |
305 | {4800, B4800}, | |
306 | {9600, B9600}, | |
307 | {19200, B19200}, | |
308 | {38400, B38400}, | |
309 | {-1, -1}, | |
310 | }; | |
311 | ||
55488e9e SG |
312 | static int |
313 | damn_b (rate) | |
88cc9a36 SG |
314 | int rate; |
315 | { | |
316 | int i; | |
317 | ||
318 | for (i = 0; baudtab[i].rate != -1; i++) | |
319 | if (rate == baudtab[i].rate) return baudtab[i].damn_b; | |
320 | return B38400; /* Random */ | |
321 | } | |
322 | ||
323 | ||
324 | /* Open a connection to a remote debugger. | |
55488e9e | 325 | NAME is the filename used for communication. */ |
88cc9a36 SG |
326 | |
327 | static int baudrate = 9600; | |
328 | static char *dev_name; | |
55488e9e SG |
329 | |
330 | static TERMINAL old_sg; | |
331 | ||
332 | static void | |
333 | st2000_open (name, from_tty) | |
88cc9a36 SG |
334 | char *name; |
335 | int from_tty; | |
336 | { | |
337 | TERMINAL sg; | |
338 | ||
339 | char *p; | |
340 | ||
341 | target_preopen (from_tty); | |
342 | ||
55488e9e | 343 | if (!name) |
88cc9a36 SG |
344 | goto erroid; |
345 | ||
55488e9e SG |
346 | /* Find the first whitespace character, it separates dev_name from |
347 | the baud rate. */ | |
348 | ||
349 | for (p = name; *p && !isspace (*p); p++) | |
88cc9a36 SG |
350 | ; |
351 | if (*p == '\0') | |
352 | erroid: | |
353 | error ("\ | |
55488e9e SG |
354 | Please include the name of the device for the serial port, and the baud rate."); |
355 | ||
88cc9a36 SG |
356 | dev_name = alloca (p - name + 1); |
357 | strncpy (dev_name, name, p - name); | |
358 | dev_name[p - name] = '\0'; | |
359 | ||
360 | /* Skip over the whitespace after dev_name */ | |
361 | for (; isspace (*p); p++) | |
362 | /*EMPTY*/; | |
363 | ||
364 | if (1 != sscanf (p, "%d ", &baudrate)) | |
365 | goto erroid; | |
366 | ||
55488e9e | 367 | st2000_close (0); |
88cc9a36 | 368 | |
55488e9e SG |
369 | st2000_desc = open (dev_name, O_RDWR); |
370 | if (st2000_desc < 0) | |
88cc9a36 | 371 | perror_with_name (dev_name); |
55488e9e SG |
372 | ioctl (st2000_desc, TIOCGETP, &sg); |
373 | old_sg = sg; | |
374 | ||
88cc9a36 SG |
375 | #ifdef HAVE_TERMIO |
376 | sg.c_cc[VMIN] = 0; /* read with timeout. */ | |
377 | sg.c_cc[VTIME] = timeout * 10; | |
378 | sg.c_lflag &= ~(ICANON | ECHO); | |
379 | sg.c_cflag = (sg.c_cflag & ~CBAUD) | damn_b (baudrate); | |
380 | #else | |
381 | sg.sg_ispeed = damn_b (baudrate); | |
382 | sg.sg_ospeed = damn_b (baudrate); | |
383 | sg.sg_flags |= RAW | ANYP; | |
384 | sg.sg_flags &= ~ECHO; | |
385 | #endif | |
386 | ||
55488e9e SG |
387 | ioctl (st2000_desc, TIOCSETP, &sg); |
388 | st2000_stream = fdopen (st2000_desc, "r+"); | |
88cc9a36 | 389 | |
55488e9e | 390 | push_target (&st2000_ops); |
88cc9a36 SG |
391 | |
392 | #ifndef HAVE_TERMIO | |
393 | #ifndef NO_SIGINTERRUPT | |
394 | /* Cause SIGALRM's to make reads fail with EINTR instead of resuming | |
395 | the read. */ | |
396 | if (siginterrupt (SIGALRM, 1) != 0) | |
55488e9e | 397 | perror ("st2000_open: error in siginterrupt"); |
88cc9a36 SG |
398 | #endif |
399 | ||
400 | /* Set up read timeout timer. */ | |
55488e9e SG |
401 | if ((void (*)) signal (SIGALRM, st2000_timer) == (void (*)) -1) |
402 | perror ("st2000_open: error in signal"); | |
88cc9a36 SG |
403 | #endif |
404 | ||
405 | #if defined (LOG_FILE) | |
406 | log_file = fopen (LOG_FILE, "w"); | |
407 | if (log_file == NULL) | |
408 | perror_with_name (LOG_FILE); | |
409 | #endif | |
410 | ||
411 | /* Hello? Are you there? */ | |
55488e9e | 412 | printf_stdebug ("\r"); |
88cc9a36 SG |
413 | |
414 | expect_prompt (); | |
55488e9e SG |
415 | |
416 | if (from_tty) | |
417 | printf ("Remote %s connected to %s\n", target_shortname, | |
418 | dev_name); | |
88cc9a36 SG |
419 | } |
420 | ||
421 | /* Close out all files and local state before this target loses control. */ | |
422 | ||
423 | static void | |
55488e9e | 424 | st2000_close (quitting) |
88cc9a36 SG |
425 | int quitting; |
426 | { | |
427 | ||
55488e9e SG |
428 | /* Reset the terminal to its original settings. */ |
429 | ||
430 | ioctl (st2000_desc, TIOCSETP, &old_sg); | |
431 | ||
88cc9a36 SG |
432 | /* Due to a bug in Unix, fclose closes not only the stdio stream, |
433 | but also the file descriptor. So we don't actually close | |
55488e9e SG |
434 | st2000_desc. */ |
435 | if (st2000_stream) | |
436 | fclose (st2000_stream); /* This also closes st2000_desc */ | |
88cc9a36 | 437 | |
55488e9e SG |
438 | /* Do not try to close st2000_desc again, later in the program. */ |
439 | st2000_stream = NULL; | |
440 | st2000_desc = -1; | |
88cc9a36 SG |
441 | |
442 | #if defined (LOG_FILE) | |
443 | if (log_file) { | |
444 | if (ferror (log_file)) | |
445 | printf ("Error writing log file.\n"); | |
446 | if (fclose (log_file) != 0) | |
447 | printf ("Error closing log file.\n"); | |
448 | } | |
449 | #endif | |
450 | } | |
451 | ||
452 | /* Terminate the open connection to the remote debugger. | |
453 | Use this when you want to detach and do something else | |
454 | with your gdb. */ | |
55488e9e SG |
455 | static void |
456 | st2000_detach (from_tty) | |
88cc9a36 SG |
457 | int from_tty; |
458 | { | |
55488e9e | 459 | pop_target(); /* calls st2000_close to do the real work */ |
88cc9a36 SG |
460 | if (from_tty) |
461 | printf ("Ending remote %s debugging\n", target_shortname); | |
462 | } | |
463 | ||
464 | /* Tell the remote machine to resume. */ | |
465 | ||
55488e9e SG |
466 | static void |
467 | st2000_resume (step, sig) | |
88cc9a36 SG |
468 | int step, sig; |
469 | { | |
470 | if (step) | |
471 | { | |
55488e9e | 472 | printf_stdebug ("ST\r"); |
88cc9a36 | 473 | /* Wait for the echo. */ |
55488e9e | 474 | expect ("ST\r"); |
88cc9a36 SG |
475 | } |
476 | else | |
477 | { | |
55488e9e SG |
478 | printf_stdebug ("GO\r"); |
479 | /* Swallow the echo. */ | |
480 | expect ("GO\r"); | |
88cc9a36 SG |
481 | } |
482 | } | |
483 | ||
484 | /* Wait until the remote machine stops, then return, | |
485 | storing status in STATUS just as `wait' would. */ | |
486 | ||
55488e9e SG |
487 | static int |
488 | st2000_wait (status) | |
88cc9a36 SG |
489 | WAITTYPE *status; |
490 | { | |
55488e9e SG |
491 | /* FIXME --- USE A REAL STRING MATCHING ALGORITHM HERE!!! */ |
492 | ||
493 | static char bpt[] = "dbug> "; | |
88cc9a36 | 494 | char *bp = bpt; |
88cc9a36 SG |
495 | |
496 | /* Large enough for either sizeof (bpt) or sizeof (exitmsg) chars. */ | |
497 | char swallowed[50]; | |
498 | /* Current position in swallowed. */ | |
499 | char *swallowed_p = swallowed; | |
500 | ||
501 | int ch; | |
502 | int ch_handled; | |
503 | ||
504 | int old_timeout = timeout; | |
505 | ||
506 | WSETEXIT ((*status), 0); | |
507 | ||
88cc9a36 SG |
508 | timeout = 0; /* Don't time out -- user program is running. */ |
509 | while (1) | |
510 | { | |
511 | ch_handled = 0; | |
512 | ch = readchar (); | |
513 | if (ch == *bp) | |
514 | { | |
515 | bp++; | |
516 | if (*bp == '\0') | |
517 | break; | |
518 | ch_handled = 1; | |
519 | ||
520 | *swallowed_p++ = ch; | |
521 | } | |
522 | else | |
523 | bp = bpt; | |
524 | ||
88cc9a36 SG |
525 | if (!ch_handled) |
526 | { | |
527 | char *p; | |
528 | ||
529 | /* Print out any characters which have been swallowed. */ | |
530 | for (p = swallowed; p < swallowed_p; ++p) | |
531 | putc (*p, stdout); | |
532 | swallowed_p = swallowed; | |
533 | ||
534 | putc (ch, stdout); | |
535 | } | |
536 | } | |
55488e9e | 537 | if (*bp == '\000') |
88cc9a36 SG |
538 | WSETSTOP ((*status), SIGTRAP); |
539 | else | |
540 | WSETEXIT ((*status), 0); | |
541 | timeout = old_timeout; | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
55488e9e SG |
546 | /* Return the name of register number REGNO in the form input and output by |
547 | STDEBUG. Currently, REGISTER_NAMES just happens to contain exactly what | |
548 | STDEBUG wants. Lets take advantage of that just as long as possible! */ | |
88cc9a36 | 549 | |
88cc9a36 SG |
550 | static char * |
551 | get_reg_name (regno) | |
552 | int regno; | |
553 | { | |
55488e9e SG |
554 | static char buf[50]; |
555 | char *p, *b; | |
556 | ||
557 | b = buf; | |
558 | ||
559 | for (p = reg_names[regno]; *p; p++) | |
560 | *b++ = toupper(*p); | |
561 | *b = '\000'; | |
562 | ||
88cc9a36 SG |
563 | return buf; |
564 | } | |
565 | ||
566 | /* Read the remote registers into the block REGS. */ | |
567 | ||
568 | static void | |
55488e9e | 569 | st2000_fetch_registers () |
88cc9a36 | 570 | { |
55488e9e | 571 | int regno; |
88cc9a36 | 572 | |
55488e9e SG |
573 | /* Yeah yeah, I know this is horribly inefficient. But it isn't done |
574 | very often... I'll clean it up later. */ | |
88cc9a36 | 575 | |
55488e9e SG |
576 | for (regno = 0; regno <= PC_REGNUM; regno++) |
577 | st2000_fetch_register(regno); | |
88cc9a36 SG |
578 | } |
579 | ||
580 | /* Fetch register REGNO, or all registers if REGNO is -1. | |
581 | Returns errno value. */ | |
55488e9e SG |
582 | static void |
583 | st2000_fetch_register (regno) | |
88cc9a36 SG |
584 | int regno; |
585 | { | |
586 | if (regno == -1) | |
55488e9e | 587 | st2000_fetch_registers (); |
88cc9a36 SG |
588 | else |
589 | { | |
590 | char *name = get_reg_name (regno); | |
55488e9e | 591 | printf_stdebug ("DR %s\r", name); |
88cc9a36 | 592 | expect (name); |
55488e9e | 593 | expect (" : "); |
88cc9a36 SG |
594 | get_hex_regs (1, regno); |
595 | expect_prompt (); | |
596 | } | |
597 | return; | |
598 | } | |
599 | ||
600 | /* Store the remote registers from the contents of the block REGS. */ | |
601 | ||
602 | static void | |
55488e9e | 603 | st2000_store_registers () |
88cc9a36 | 604 | { |
55488e9e | 605 | int regno; |
88cc9a36 | 606 | |
55488e9e SG |
607 | for (regno = 0; regno <= PC_REGNUM; regno++) |
608 | st2000_store_register(regno); | |
88cc9a36 | 609 | |
55488e9e | 610 | registers_changed (); |
88cc9a36 SG |
611 | } |
612 | ||
613 | /* Store register REGNO, or all if REGNO == 0. | |
614 | Return errno value. */ | |
55488e9e SG |
615 | static void |
616 | st2000_store_register (regno) | |
88cc9a36 SG |
617 | int regno; |
618 | { | |
619 | if (regno == -1) | |
55488e9e | 620 | st2000_store_registers (); |
88cc9a36 SG |
621 | else |
622 | { | |
55488e9e SG |
623 | printf_stdebug ("PR %s %x\r", get_reg_name (regno), |
624 | read_register (regno)); | |
625 | ||
88cc9a36 SG |
626 | expect_prompt (); |
627 | } | |
88cc9a36 SG |
628 | } |
629 | ||
630 | /* Get ready to modify the registers array. On machines which store | |
631 | individual registers, this doesn't need to do anything. On machines | |
632 | which store all the registers in one fell swoop, this makes sure | |
633 | that registers contains all the registers from the program being | |
634 | debugged. */ | |
635 | ||
55488e9e SG |
636 | static void |
637 | st2000_prepare_to_store () | |
88cc9a36 SG |
638 | { |
639 | /* Do nothing, since we can store individual regs */ | |
640 | } | |
641 | ||
55488e9e SG |
642 | static void |
643 | st2000_files_info () | |
88cc9a36 | 644 | { |
55488e9e SG |
645 | printf ("\tAttached to %s at %d baud.\n", |
646 | dev_name, baudrate); | |
88cc9a36 SG |
647 | } |
648 | ||
649 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
650 | to inferior's memory at MEMADDR. Returns length moved. */ | |
55488e9e SG |
651 | static int |
652 | st2000_write_inferior_memory (memaddr, myaddr, len) | |
88cc9a36 | 653 | CORE_ADDR memaddr; |
55488e9e | 654 | unsigned char *myaddr; |
88cc9a36 SG |
655 | int len; |
656 | { | |
657 | int i; | |
658 | ||
659 | for (i = 0; i < len; i++) | |
660 | { | |
55488e9e SG |
661 | printf_stdebug ("PM.B %x %x\r", memaddr + i, myaddr[i]); |
662 | expect_prompt (); | |
88cc9a36 SG |
663 | } |
664 | return len; | |
665 | } | |
666 | ||
667 | /* Read LEN bytes from inferior memory at MEMADDR. Put the result | |
668 | at debugger address MYADDR. Returns length moved. */ | |
55488e9e SG |
669 | static int |
670 | st2000_read_inferior_memory(memaddr, myaddr, len) | |
88cc9a36 SG |
671 | CORE_ADDR memaddr; |
672 | char *myaddr; | |
673 | int len; | |
674 | { | |
675 | int i; | |
676 | ||
677 | /* Number of bytes read so far. */ | |
678 | int count; | |
679 | ||
680 | /* Starting address of this pass. */ | |
681 | unsigned long startaddr; | |
682 | ||
683 | /* Number of bytes to read in this pass. */ | |
684 | int len_this_pass; | |
685 | ||
686 | /* Note that this code works correctly if startaddr is just less | |
687 | than UINT_MAX (well, really CORE_ADDR_MAX if there was such a | |
688 | thing). That is, something like | |
55488e9e | 689 | st2000_read_bytes (CORE_ADDR_MAX - 4, foo, 4) |
88cc9a36 SG |
690 | works--it never adds len to memaddr and gets 0. */ |
691 | /* However, something like | |
55488e9e | 692 | st2000_read_bytes (CORE_ADDR_MAX - 3, foo, 4) |
88cc9a36 SG |
693 | doesn't need to work. Detect it and give up if there's an attempt |
694 | to do that. */ | |
695 | if (((memaddr - 1) + len) < memaddr) { | |
696 | errno = EIO; | |
697 | return 0; | |
698 | } | |
699 | ||
700 | startaddr = memaddr; | |
701 | count = 0; | |
702 | while (count < len) | |
703 | { | |
704 | len_this_pass = 16; | |
705 | if ((startaddr % 16) != 0) | |
706 | len_this_pass -= startaddr % 16; | |
707 | if (len_this_pass > (len - count)) | |
708 | len_this_pass = (len - count); | |
709 | ||
55488e9e SG |
710 | printf_stdebug ("DI.L %x %x\r", startaddr, len_this_pass); |
711 | expect (": "); | |
88cc9a36 SG |
712 | |
713 | for (i = 0; i < len_this_pass; i++) | |
714 | get_hex_byte (&myaddr[count++]); | |
715 | ||
716 | expect_prompt (); | |
717 | ||
718 | startaddr += len_this_pass; | |
719 | } | |
720 | return len; | |
721 | } | |
722 | ||
55488e9e SG |
723 | /* FIXME-someday! Merge these two. */ |
724 | static int | |
725 | st2000_xfer_inferior_memory (memaddr, myaddr, len, write, target) | |
726 | CORE_ADDR memaddr; | |
727 | char *myaddr; | |
728 | int len; | |
729 | int write; | |
730 | struct target_ops *target; /* ignored */ | |
731 | { | |
732 | if (write) | |
733 | return st2000_write_inferior_memory (memaddr, myaddr, len); | |
734 | else | |
735 | return st2000_read_inferior_memory (memaddr, myaddr, len); | |
736 | } | |
737 | ||
88cc9a36 | 738 | static void |
55488e9e | 739 | st2000_kill (args, from_tty) |
88cc9a36 SG |
740 | char *args; |
741 | int from_tty; | |
742 | { | |
743 | return; /* Ignore attempts to kill target system */ | |
744 | } | |
745 | ||
746 | /* Clean up when a program exits. | |
747 | ||
748 | The program actually lives on in the remote processor's RAM, and may be | |
749 | run again without a download. Don't leave it full of breakpoint | |
750 | instructions. */ | |
751 | ||
55488e9e SG |
752 | static void |
753 | st2000_mourn_inferior () | |
88cc9a36 SG |
754 | { |
755 | remove_breakpoints (); | |
756 | generic_mourn_inferior (); /* Do all the proper things now */ | |
757 | } | |
55488e9e SG |
758 | |
759 | #define MAX_STDEBUG_BREAKPOINTS 16 | |
760 | ||
761 | extern int memory_breakpoint_size; | |
762 | static CORE_ADDR breakaddr[MAX_STDEBUG_BREAKPOINTS] = {0}; | |
763 | ||
764 | static int | |
765 | st2000_insert_breakpoint (addr, shadow) | |
766 | CORE_ADDR addr; | |
767 | char *shadow; | |
768 | { | |
769 | int i; | |
770 | ||
771 | for (i = 0; i <= MAX_STDEBUG_BREAKPOINTS; i++) | |
772 | if (breakaddr[i] == 0) | |
773 | { | |
774 | breakaddr[i] = addr; | |
775 | ||
776 | st2000_read_inferior_memory(addr, shadow, memory_breakpoint_size); | |
777 | printf_stdebug("BR %x H\r", addr); | |
778 | expect_prompt(); | |
779 | return 0; | |
780 | } | |
781 | ||
782 | fprintf(stderr, "Too many breakpoints (> 16) for STDBUG\n"); | |
783 | return 1; | |
784 | } | |
785 | ||
786 | static int | |
787 | st2000_remove_breakpoint (addr, shadow) | |
788 | CORE_ADDR addr; | |
789 | char *shadow; | |
790 | { | |
791 | int i; | |
792 | ||
793 | for (i = 0; i < MAX_STDEBUG_BREAKPOINTS; i++) | |
794 | if (breakaddr[i] == addr) | |
795 | { | |
796 | breakaddr[i] = 0; | |
797 | ||
798 | printf_stdebug("CB %d\r", i); | |
799 | expect_prompt(); | |
800 | return 0; | |
801 | } | |
802 | ||
803 | fprintf(stderr, "Can't find breakpoint associated with 0x%x\n", addr); | |
804 | return 1; | |
805 | } | |
806 | ||
88cc9a36 SG |
807 | /* Define the target subroutine names */ |
808 | ||
55488e9e SG |
809 | static struct target_ops st2000_ops = { |
810 | "st2000", "Remote serial Tandem ST2000 target", | |
811 | "Use a remote computer running STDEBUG connected by a serial line,\n\ | |
812 | or a network connection.\n\ | |
88cc9a36 | 813 | Arguments are the name of the device for the serial line,\n\ |
55488e9e SG |
814 | the speed to connect at in bits per second.", |
815 | st2000_open, st2000_close, | |
816 | 0, st2000_detach, st2000_resume, st2000_wait, | |
817 | st2000_fetch_register, st2000_store_register, | |
818 | st2000_prepare_to_store, 0, 0, /* conv_to, conv_from */ | |
819 | st2000_xfer_inferior_memory, st2000_files_info, | |
820 | st2000_insert_breakpoint, st2000_remove_breakpoint, /* Breakpoints */ | |
88cc9a36 | 821 | 0, 0, 0, 0, 0, /* Terminal handling */ |
55488e9e | 822 | st2000_kill, |
88cc9a36 SG |
823 | 0, /* load */ |
824 | 0, /* lookup_symbol */ | |
55488e9e SG |
825 | st2000_create_inferior, |
826 | st2000_mourn_inferior, | |
88cc9a36 SG |
827 | process_stratum, 0, /* next */ |
828 | 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ | |
829 | 0, 0, /* Section pointers */ | |
830 | OPS_MAGIC, /* Always the last thing */ | |
831 | }; | |
832 | ||
833 | void | |
55488e9e | 834 | _initialize_remote_st2000 () |
88cc9a36 | 835 | { |
55488e9e | 836 | add_target (&st2000_ops); |
88cc9a36 | 837 | } |