Commit | Line | Data |
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b543979c | 1 | /* Remote target communications for serial-line targets in custom GDB protocol |
7c622b41 | 2 | Copyright 1988, 1991, 1992, 1993 Free Software Foundation, Inc. |
bd5635a1 RP |
3 | |
4 | This file is part of GDB. | |
5 | ||
b543979c | 6 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 7 | it under the terms of the GNU General Public License as published by |
b543979c JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
bd5635a1 | 10 | |
b543979c | 11 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
b543979c JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
bd5635a1 RP |
19 | |
20 | /* Remote communication protocol. | |
e50ebec8 JK |
21 | |
22 | A debug packet whose contents are <data> | |
23 | is encapsulated for transmission in the form: | |
24 | ||
25 | $ <data> # CSUM1 CSUM2 | |
26 | ||
27 | <data> must be ASCII alphanumeric and cannot include characters | |
28 | '$' or '#' | |
29 | ||
30 | CSUM1 and CSUM2 are ascii hex representation of an 8-bit | |
31 | checksum of <data>, the most significant nibble is sent first. | |
32 | the hex digits 0-9,a-f are used. | |
33 | ||
34 | Receiver responds with: | |
35 | ||
36 | + - if CSUM is correct and ready for next packet | |
37 | - - if CSUM is incorrect | |
38 | ||
39 | <data> is as follows: | |
bd5635a1 RP |
40 | All values are encoded in ascii hex digits. |
41 | ||
42 | Request Packet | |
43 | ||
44 | read registers g | |
45 | reply XX....X Each byte of register data | |
46 | is described by two hex digits. | |
47 | Registers are in the internal order | |
48 | for GDB, and the bytes in a register | |
49 | are in the same order the machine uses. | |
50 | or ENN for an error. | |
51 | ||
52 | write regs GXX..XX Each byte of register data | |
53 | is described by two hex digits. | |
54 | reply OK for success | |
55 | ENN for an error | |
56 | ||
57 | read mem mAA..AA,LLLL AA..AA is address, LLLL is length. | |
58 | reply XX..XX XX..XX is mem contents | |
d538b510 RP |
59 | Can be fewer bytes than requested |
60 | if able to read only part of the data. | |
bd5635a1 RP |
61 | or ENN NN is errno |
62 | ||
63 | write mem MAA..AA,LLLL:XX..XX | |
64 | AA..AA is address, | |
65 | LLLL is number of bytes, | |
66 | XX..XX is data | |
67 | reply OK for success | |
d538b510 RP |
68 | ENN for an error (this includes the case |
69 | where only part of the data was | |
70 | written). | |
bd5635a1 RP |
71 | |
72 | cont cAA..AA AA..AA is address to resume | |
73 | If AA..AA is omitted, | |
74 | resume at same address. | |
75 | ||
76 | step sAA..AA AA..AA is address to resume | |
77 | If AA..AA is omitted, | |
78 | resume at same address. | |
79 | ||
80 | last signal ? Reply the current reason for stopping. | |
81 | This is the same reply as is generated | |
82 | for step or cont : SAA where AA is the | |
83 | signal number. | |
84 | ||
85 | There is no immediate reply to step or cont. | |
86 | The reply comes when the machine stops. | |
87 | It is SAA AA is the "signal number" | |
88 | ||
e50ebec8 JK |
89 | or... TAAn...:r...;n:r...;n...:r...; |
90 | AA = signal number | |
91 | n... = register number | |
92 | r... = register contents | |
758aeb93 ILT |
93 | or... WAA The process extited, and AA is |
94 | the exit status. This is only | |
95 | applicable for certains sorts of | |
96 | targets. | |
97 | or... NAATT;DD;BB Relocate the object file. | |
98 | AA = signal number | |
99 | TT = text address | |
100 | DD = data address | |
101 | BB = bss address | |
102 | This is used by the NLM stub, | |
103 | which is why it only has three | |
104 | addresses rather than one per | |
105 | section: the NLM stub always | |
106 | sees only three sections, even | |
107 | though gdb may see more. | |
8f86a4e4 | 108 | |
d538b510 RP |
109 | kill request k |
110 | ||
111 | toggle debug d toggle debug flag (see 386 & 68k stubs) | |
112 | reset r reset -- see sparc stub. | |
113 | reserved <other> On other requests, the stub should | |
114 | ignore the request and send an empty | |
115 | response ($#<checksum>). This way | |
116 | we can extend the protocol and GDB | |
117 | can tell whether the stub it is | |
118 | talking to uses the old or the new. | |
bd5635a1 RP |
119 | */ |
120 | ||
d747e0af | 121 | #include "defs.h" |
bd5635a1 RP |
122 | #include <string.h> |
123 | #include <fcntl.h> | |
bd5635a1 RP |
124 | #include "frame.h" |
125 | #include "inferior.h" | |
e50ebec8 | 126 | #include "bfd.h" |
6b27ebe8 | 127 | #include "symfile.h" |
bd5635a1 RP |
128 | #include "target.h" |
129 | #include "wait.h" | |
130 | #include "terminal.h" | |
8f86a4e4 | 131 | #include "gdbcmd.h" |
758aeb93 ILT |
132 | #include "objfiles.h" |
133 | #include "gdb-stabs.h" | |
bd5635a1 | 134 | |
d538b510 RP |
135 | #include "dcache.h" |
136 | ||
8f86a4e4 | 137 | #if !defined(DONT_USE_REMOTE) |
bd5635a1 RP |
138 | #ifdef USG |
139 | #include <sys/types.h> | |
140 | #endif | |
141 | ||
142 | #include <signal.h> | |
ebdb9ade | 143 | #include "serial.h" |
bd5635a1 | 144 | |
b543979c JG |
145 | /* Prototypes for local functions */ |
146 | ||
d538b510 RP |
147 | static int |
148 | remote_write_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len)); | |
b543979c | 149 | |
d538b510 RP |
150 | static int |
151 | remote_read_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len)); | |
b543979c JG |
152 | |
153 | static void | |
5af4f5f6 | 154 | remote_files_info PARAMS ((struct target_ops *ignore)); |
b543979c JG |
155 | |
156 | static int | |
5af4f5f6 JK |
157 | remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len, |
158 | int should_write, struct target_ops *target)); | |
b543979c JG |
159 | |
160 | static void | |
161 | remote_prepare_to_store PARAMS ((void)); | |
162 | ||
163 | static void | |
5af4f5f6 | 164 | remote_fetch_registers PARAMS ((int regno)); |
b543979c JG |
165 | |
166 | static void | |
d538b510 | 167 | remote_resume PARAMS ((int pid, int step, int siggnal)); |
b543979c | 168 | |
7c622b41 | 169 | static int |
5af4f5f6 | 170 | remote_start_remote PARAMS ((char *dummy)); |
7c622b41 | 171 | |
b543979c | 172 | static void |
5af4f5f6 | 173 | remote_open PARAMS ((char *name, int from_tty)); |
b543979c JG |
174 | |
175 | static void | |
5af4f5f6 | 176 | remote_close PARAMS ((int quitting)); |
b543979c JG |
177 | |
178 | static void | |
5af4f5f6 | 179 | remote_store_registers PARAMS ((int regno)); |
b543979c JG |
180 | |
181 | static void | |
5af4f5f6 | 182 | getpkt PARAMS ((char *buf, int forever)); |
b543979c JG |
183 | |
184 | static void | |
5af4f5f6 | 185 | putpkt PARAMS ((char *buf)); |
b543979c JG |
186 | |
187 | static void | |
5af4f5f6 | 188 | remote_send PARAMS ((char *buf)); |
b543979c JG |
189 | |
190 | static int | |
191 | readchar PARAMS ((void)); | |
192 | ||
193 | static int | |
d0d8484a | 194 | remote_wait PARAMS ((int pid, WAITTYPE *status)); |
b543979c JG |
195 | |
196 | static int | |
5af4f5f6 | 197 | tohex PARAMS ((int nib)); |
b543979c JG |
198 | |
199 | static int | |
5af4f5f6 | 200 | fromhex PARAMS ((int a)); |
b543979c JG |
201 | |
202 | static void | |
5af4f5f6 JK |
203 | remote_detach PARAMS ((char *args, int from_tty)); |
204 | ||
205 | static void | |
206 | remote_interrupt PARAMS ((int signo)); | |
207 | ||
208 | static void | |
209 | remote_interrupt_twice PARAMS ((int signo)); | |
b543979c | 210 | |
981a3309 SG |
211 | static void |
212 | interrupt_query PARAMS ((void)); | |
213 | ||
bd5635a1 RP |
214 | extern struct target_ops remote_ops; /* Forward decl */ |
215 | ||
d0d8484a SG |
216 | extern int baud_rate; |
217 | ||
218 | extern int remote_debug; | |
219 | ||
ebdb9ade JK |
220 | /* This was 5 seconds, which is a long time to sit and wait. |
221 | Unless this is going though some terminal server or multiplexer or | |
222 | other form of hairy serial connection, I would think 2 seconds would | |
223 | be plenty. */ | |
224 | static int timeout = 2; | |
bd5635a1 RP |
225 | |
226 | #if 0 | |
227 | int icache; | |
228 | #endif | |
229 | ||
16e1d1d3 | 230 | /* Descriptor for I/O to remote machine. Initialize it to NULL so that |
bd5635a1 RP |
231 | remote_open knows that we don't have a file open when the program |
232 | starts. */ | |
ebdb9ade | 233 | serial_t remote_desc = NULL; |
bd5635a1 | 234 | |
b543979c | 235 | #define PBUFSIZ 1024 |
bd5635a1 RP |
236 | |
237 | /* Maximum number of bytes to read/write at once. The value here | |
238 | is chosen to fill up a packet (the headers account for the 32). */ | |
239 | #define MAXBUFBYTES ((PBUFSIZ-32)/2) | |
240 | ||
b543979c JG |
241 | /* Round up PBUFSIZ to hold all the registers, at least. */ |
242 | #if REGISTER_BYTES > MAXBUFBYTES | |
243 | #undef PBUFSIZ | |
244 | #define PBUFSIZ (REGISTER_BYTES * 2 + 32) | |
bd5635a1 | 245 | #endif |
bd5635a1 | 246 | \f |
bd5635a1 RP |
247 | /* Clean up connection to a remote debugger. */ |
248 | ||
e1ce8aa5 | 249 | /* ARGSUSED */ |
b543979c | 250 | static void |
bd5635a1 RP |
251 | remote_close (quitting) |
252 | int quitting; | |
253 | { | |
ebdb9ade JK |
254 | if (remote_desc) |
255 | SERIAL_CLOSE (remote_desc); | |
256 | remote_desc = NULL; | |
b543979c JG |
257 | } |
258 | ||
7c622b41 JG |
259 | /* Stub for catch_errors. */ |
260 | ||
261 | static int | |
262 | remote_start_remote (dummy) | |
263 | char *dummy; | |
264 | { | |
ac7a377f JK |
265 | immediate_quit = 1; /* Allow user to interrupt it */ |
266 | ||
7c622b41 | 267 | /* Ack any packet which the remote side has already sent. */ |
a4cb75b8 JK |
268 | /* I'm not sure this \r is needed; we don't use it any other time we |
269 | send an ack. */ | |
ebdb9ade | 270 | SERIAL_WRITE (remote_desc, "+\r", 2); |
7c622b41 | 271 | putpkt ("?"); /* initiate a query from remote machine */ |
ac7a377f | 272 | immediate_quit = 0; |
7c622b41 JG |
273 | |
274 | start_remote (); /* Initialize gdb process mechanisms */ | |
275 | return 1; | |
276 | } | |
277 | ||
bd5635a1 RP |
278 | /* Open a connection to a remote debugger. |
279 | NAME is the filename used for communication. */ | |
280 | ||
d538b510 RP |
281 | static DCACHE *remote_dcache; |
282 | ||
b543979c | 283 | static void |
bd5635a1 RP |
284 | remote_open (name, from_tty) |
285 | char *name; | |
286 | int from_tty; | |
287 | { | |
bd5635a1 RP |
288 | if (name == 0) |
289 | error ( | |
290 | "To open a remote debug connection, you need to specify what serial\n\ | |
291 | device is attached to the remote system (e.g. /dev/ttya)."); | |
292 | ||
f2fc6e7a JK |
293 | target_preopen (from_tty); |
294 | ||
ebdb9ade | 295 | unpush_target (&remote_ops); |
bd5635a1 | 296 | |
d538b510 | 297 | remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes); |
bd5635a1 | 298 | |
ebdb9ade JK |
299 | remote_desc = SERIAL_OPEN (name); |
300 | if (!remote_desc) | |
bd5635a1 RP |
301 | perror_with_name (name); |
302 | ||
d0d8484a | 303 | if (SERIAL_SETBAUDRATE (remote_desc, baud_rate)) |
b543979c | 304 | { |
a94abe5b RP |
305 | SERIAL_CLOSE (remote_desc); |
306 | perror_with_name (name); | |
b543979c | 307 | } |
ebdb9ade JK |
308 | |
309 | SERIAL_RAW (remote_desc); | |
bd5635a1 | 310 | |
e15f2a54 JK |
311 | /* If there is something sitting in the buffer we might take it as a |
312 | response to a command, which would be bad. */ | |
313 | SERIAL_FLUSH_INPUT (remote_desc); | |
314 | ||
bd5635a1 | 315 | if (from_tty) |
7c622b41 JG |
316 | { |
317 | puts_filtered ("Remote debugging using "); | |
318 | puts_filtered (name); | |
319 | puts_filtered ("\n"); | |
320 | } | |
bd5635a1 | 321 | push_target (&remote_ops); /* Switch to using remote target now */ |
bd5635a1 | 322 | |
ac7a377f JK |
323 | /* Start the remote connection; if error (0), discard this target. |
324 | In particular, if the user quits, be sure to discard it | |
325 | (we'd be in an inconsistent state otherwise). */ | |
7c622b41 | 326 | if (!catch_errors (remote_start_remote, (char *)0, |
e50ebec8 | 327 | "Couldn't establish connection to remote target\n", RETURN_MASK_ALL)) |
7c622b41 | 328 | pop_target(); |
bd5635a1 RP |
329 | } |
330 | ||
331 | /* remote_detach() | |
332 | takes a program previously attached to and detaches it. | |
333 | We better not have left any breakpoints | |
334 | in the program or it'll die when it hits one. | |
335 | Close the open connection to the remote debugger. | |
336 | Use this when you want to detach and do something else | |
337 | with your gdb. */ | |
338 | ||
339 | static void | |
340 | remote_detach (args, from_tty) | |
341 | char *args; | |
342 | int from_tty; | |
343 | { | |
344 | if (args) | |
345 | error ("Argument given to \"detach\" when remotely debugging."); | |
346 | ||
347 | pop_target (); | |
348 | if (from_tty) | |
7c622b41 | 349 | puts_filtered ("Ending remote debugging.\n"); |
bd5635a1 RP |
350 | } |
351 | ||
352 | /* Convert hex digit A to a number. */ | |
353 | ||
354 | static int | |
355 | fromhex (a) | |
356 | int a; | |
357 | { | |
358 | if (a >= '0' && a <= '9') | |
359 | return a - '0'; | |
360 | else if (a >= 'a' && a <= 'f') | |
361 | return a - 'a' + 10; | |
362 | else | |
363 | error ("Reply contains invalid hex digit"); | |
364 | return -1; | |
365 | } | |
366 | ||
367 | /* Convert number NIB to a hex digit. */ | |
368 | ||
369 | static int | |
370 | tohex (nib) | |
371 | int nib; | |
372 | { | |
373 | if (nib < 10) | |
374 | return '0'+nib; | |
375 | else | |
376 | return 'a'+nib-10; | |
377 | } | |
378 | \f | |
379 | /* Tell the remote machine to resume. */ | |
380 | ||
b543979c | 381 | static void |
d538b510 RP |
382 | remote_resume (pid, step, siggnal) |
383 | int pid, step, siggnal; | |
bd5635a1 RP |
384 | { |
385 | char buf[PBUFSIZ]; | |
386 | ||
387 | if (siggnal) | |
ebdb9ade JK |
388 | { |
389 | char *name; | |
390 | target_terminal_ours_for_output (); | |
391 | printf_filtered ("Can't send signals to a remote system. "); | |
392 | name = strsigno (siggnal); | |
393 | if (name) | |
394 | printf_filtered (name); | |
395 | else | |
396 | printf_filtered ("Signal %d", siggnal); | |
397 | printf_filtered (" not sent.\n"); | |
398 | target_terminal_inferior (); | |
399 | } | |
bd5635a1 | 400 | |
d538b510 | 401 | dcache_flush (remote_dcache); |
bd5635a1 RP |
402 | |
403 | strcpy (buf, step ? "s": "c"); | |
404 | ||
405 | putpkt (buf); | |
406 | } | |
ebdb9ade | 407 | \f |
b543979c JG |
408 | /* Send ^C to target to halt it. Target will respond, and send us a |
409 | packet. */ | |
410 | ||
5af4f5f6 JK |
411 | static void |
412 | remote_interrupt (signo) | |
e676a15f | 413 | int signo; |
b543979c | 414 | { |
ebdb9ade JK |
415 | /* If this doesn't work, try more severe steps. */ |
416 | signal (signo, remote_interrupt_twice); | |
8f86a4e4 | 417 | |
d0d8484a | 418 | if (remote_debug) |
8f86a4e4 JG |
419 | printf ("remote_interrupt called\n"); |
420 | ||
ebdb9ade | 421 | SERIAL_WRITE (remote_desc, "\003", 1); /* Send a ^C */ |
b543979c JG |
422 | } |
423 | ||
5af4f5f6 JK |
424 | static void (*ofunc)(); |
425 | ||
ebdb9ade JK |
426 | /* The user typed ^C twice. */ |
427 | static void | |
428 | remote_interrupt_twice (signo) | |
429 | int signo; | |
430 | { | |
431 | signal (signo, ofunc); | |
432 | ||
981a3309 SG |
433 | interrupt_query (); |
434 | ||
435 | signal (signo, remote_interrupt); | |
436 | } | |
437 | ||
438 | /* Ask the user what to do when an interrupt is received. */ | |
439 | ||
440 | static void | |
441 | interrupt_query () | |
442 | { | |
ebdb9ade | 443 | target_terminal_ours (); |
981a3309 | 444 | |
6b27ebe8 | 445 | if (query ("Interrupted while waiting for the program.\n\ |
ebdb9ade JK |
446 | Give up (and stop debugging it)? ")) |
447 | { | |
448 | target_mourn_inferior (); | |
e50ebec8 | 449 | return_to_top_level (RETURN_QUIT); |
ebdb9ade | 450 | } |
981a3309 SG |
451 | |
452 | target_terminal_inferior (); | |
ebdb9ade | 453 | } |
b543979c | 454 | |
bd5635a1 | 455 | /* Wait until the remote machine stops, then return, |
e1ce8aa5 JK |
456 | storing status in STATUS just as `wait' would. |
457 | Returns "pid" (though it's not clear what, if anything, that | |
458 | means in the case of this target). */ | |
bd5635a1 | 459 | |
b543979c | 460 | static int |
d0d8484a SG |
461 | remote_wait (pid, status) |
462 | int pid; | |
bd5635a1 RP |
463 | WAITTYPE *status; |
464 | { | |
465 | unsigned char buf[PBUFSIZ]; | |
8f86a4e4 | 466 | |
bd5635a1 | 467 | WSETEXIT ((*status), 0); |
b543979c | 468 | |
4f8a48e5 | 469 | while (1) |
8f86a4e4 | 470 | { |
4f8a48e5 | 471 | unsigned char *p; |
a03d4f8e | 472 | |
4f8a48e5 ILT |
473 | ofunc = (void (*)()) signal (SIGINT, remote_interrupt); |
474 | getpkt ((char *) buf, 1); | |
475 | signal (SIGINT, ofunc); | |
4ecee2f9 | 476 | |
4f8a48e5 ILT |
477 | if (buf[0] == 'E') |
478 | warning ("Remote failure reply: %s", buf); | |
479 | else if (buf[0] == 'T') | |
8f86a4e4 | 480 | { |
4f8a48e5 ILT |
481 | int i; |
482 | long regno; | |
483 | char regs[MAX_REGISTER_RAW_SIZE]; | |
a03d4f8e | 484 | |
4f8a48e5 ILT |
485 | /* Expedited reply, containing Signal, {regno, reg} repeat */ |
486 | /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where | |
487 | ss = signal number | |
488 | n... = register number | |
489 | r... = register contents | |
490 | */ | |
5af4f5f6 | 491 | |
4f8a48e5 | 492 | p = &buf[3]; /* after Txx */ |
5af4f5f6 | 493 | |
4f8a48e5 ILT |
494 | while (*p) |
495 | { | |
496 | unsigned char *p1; | |
5af4f5f6 | 497 | |
4f8a48e5 | 498 | regno = strtol (p, &p1, 16); /* Read the register number */ |
5af4f5f6 | 499 | |
4f8a48e5 ILT |
500 | if (p1 == p) |
501 | warning ("Remote sent badly formed register number: %s\nPacket: '%s'\n", | |
502 | p1, buf); | |
4ecee2f9 | 503 | |
4f8a48e5 | 504 | p = p1; |
4ecee2f9 | 505 | |
4f8a48e5 ILT |
506 | if (*p++ != ':') |
507 | warning ("Malformed packet (missing colon): %s\nPacket: '%s'\n", | |
508 | p, buf); | |
a03d4f8e | 509 | |
4f8a48e5 ILT |
510 | if (regno >= NUM_REGS) |
511 | warning ("Remote sent bad register number %d: %s\nPacket: '%s'\n", | |
512 | regno, p, buf); | |
513 | ||
514 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i++) | |
515 | { | |
516 | if (p[0] == 0 || p[1] == 0) | |
517 | warning ("Remote reply is too short: %s", buf); | |
518 | regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); | |
519 | p += 2; | |
520 | } | |
521 | ||
522 | if (*p++ != ';') | |
523 | warning ("Remote register badly formatted: %s", buf); | |
524 | ||
525 | supply_register (regno, regs); | |
526 | } | |
527 | break; | |
8f86a4e4 | 528 | } |
4f8a48e5 | 529 | else if (buf[0] == 'N') |
758aeb93 | 530 | { |
4f8a48e5 ILT |
531 | unsigned char *p1; |
532 | bfd_vma text_addr, data_addr, bss_addr; | |
533 | ||
534 | /* Relocate object file. Format is NAATT;DD;BB where AA is | |
535 | the signal number, TT is the new text address, DD is the | |
536 | new data address, and BB is the new bss address. This is | |
537 | used by the NLM stub; gdb may see more sections. */ | |
538 | p = &buf[3]; | |
981a3309 | 539 | text_addr = strtoul (p, &p1, 16); |
4f8a48e5 ILT |
540 | if (p1 == p || *p1 != ';') |
541 | warning ("Malformed relocation packet: Packet '%s'", buf); | |
542 | p = p1 + 1; | |
981a3309 | 543 | data_addr = strtoul (p, &p1, 16); |
4f8a48e5 ILT |
544 | if (p1 == p || *p1 != ';') |
545 | warning ("Malformed relocation packet: Packet '%s'", buf); | |
546 | p = p1 + 1; | |
981a3309 | 547 | bss_addr = strtoul (p, &p1, 16); |
4f8a48e5 ILT |
548 | if (p1 == p) |
549 | warning ("Malformed relocation packet: Packet '%s'", buf); | |
550 | ||
981a3309 SG |
551 | if (symfile_objfile != NULL |
552 | && (ANOFFSET (symfile_objfile->section_offsets, | |
553 | SECT_OFF_TEXT) != text_addr | |
554 | || ANOFFSET (symfile_objfile->section_offsets, | |
555 | SECT_OFF_DATA) != data_addr | |
556 | || ANOFFSET (symfile_objfile->section_offsets, | |
557 | SECT_OFF_BSS) != bss_addr)) | |
4f8a48e5 ILT |
558 | { |
559 | struct section_offsets *offs; | |
560 | ||
afa01c54 JK |
561 | /* FIXME: This code assumes gdb-stabs.h is being used; |
562 | it's broken for xcoff, dwarf, sdb-coff, etc. But | |
563 | there is no simple canonical representation for this | |
564 | stuff. (Just what does "text" as seen by the stub | |
565 | mean, anyway?). */ | |
566 | ||
4f8a48e5 | 567 | /* FIXME: Why don't the various symfile_offsets routines |
afa01c54 JK |
568 | in the sym_fns vectors set this? |
569 | (no good reason -kingdon). */ | |
4f8a48e5 ILT |
570 | if (symfile_objfile->num_sections == 0) |
571 | symfile_objfile->num_sections = SECT_OFF_MAX; | |
572 | ||
573 | offs = ((struct section_offsets *) | |
574 | alloca (sizeof (struct section_offsets) | |
575 | + (symfile_objfile->num_sections | |
576 | * sizeof (offs->offsets)))); | |
577 | memcpy (offs, symfile_objfile->section_offsets, | |
578 | (sizeof (struct section_offsets) | |
579 | + (symfile_objfile->num_sections | |
580 | * sizeof (offs->offsets)))); | |
581 | ANOFFSET (offs, SECT_OFF_TEXT) = text_addr; | |
582 | ANOFFSET (offs, SECT_OFF_DATA) = data_addr; | |
583 | ANOFFSET (offs, SECT_OFF_BSS) = bss_addr; | |
584 | ||
585 | objfile_relocate (symfile_objfile, offs); | |
981a3309 SG |
586 | { |
587 | struct obj_section *s; | |
cefa23ca | 588 | bfd *abfd; |
981a3309 | 589 | |
cefa23ca | 590 | abfd = symfile_objfile->obfd; |
981a3309 SG |
591 | |
592 | for (s = symfile_objfile->sections; | |
593 | s < symfile_objfile->sections_end; ++s) | |
594 | { | |
595 | flagword flags; | |
596 | ||
cefa23ca | 597 | flags = bfd_get_section_flags (abfd, s->sec_ptr); |
981a3309 SG |
598 | |
599 | if (flags & SEC_CODE) | |
600 | { | |
601 | s->addr += text_addr; | |
602 | s->endaddr += text_addr; | |
603 | } | |
604 | else if (flags & (SEC_DATA | SEC_LOAD)) | |
605 | { | |
606 | s->addr += data_addr; | |
607 | s->endaddr += data_addr; | |
608 | } | |
609 | else if (flags & SEC_ALLOC) | |
610 | { | |
611 | s->addr += bss_addr; | |
612 | s->endaddr += bss_addr; | |
613 | } | |
614 | } | |
615 | } | |
4f8a48e5 ILT |
616 | } |
617 | break; | |
758aeb93 | 618 | } |
4f8a48e5 ILT |
619 | else if (buf[0] == 'W') |
620 | { | |
621 | /* The remote process exited. */ | |
622 | WSETEXIT (*status, (fromhex (buf[1]) << 4) + fromhex (buf[2])); | |
623 | return 0; | |
624 | } | |
625 | else if (buf[0] == 'S') | |
626 | break; | |
627 | else | |
628 | warning ("Invalid remote reply: %s", buf); | |
758aeb93 | 629 | } |
8f86a4e4 | 630 | |
bd5635a1 | 631 | WSETSTOP ((*status), (((fromhex (buf[1])) << 4) + (fromhex (buf[2])))); |
8f86a4e4 | 632 | |
e1ce8aa5 | 633 | return 0; |
bd5635a1 RP |
634 | } |
635 | ||
55fea07b JK |
636 | /* Number of bytes of registers this stub implements. */ |
637 | static int register_bytes_found; | |
638 | ||
bd5635a1 | 639 | /* Read the remote registers into the block REGS. */ |
e1ce8aa5 JK |
640 | /* Currently we just read all the registers, so we don't use regno. */ |
641 | /* ARGSUSED */ | |
b543979c | 642 | static void |
bd5635a1 RP |
643 | remote_fetch_registers (regno) |
644 | int regno; | |
645 | { | |
646 | char buf[PBUFSIZ]; | |
647 | int i; | |
648 | char *p; | |
649 | char regs[REGISTER_BYTES]; | |
650 | ||
651 | sprintf (buf, "g"); | |
652 | remote_send (buf); | |
653 | ||
55fea07b JK |
654 | /* Unimplemented registers read as all bits zero. */ |
655 | memset (regs, 0, REGISTER_BYTES); | |
656 | ||
981a3309 SG |
657 | /* We can get out of synch in various cases. If the first character |
658 | in the buffer is not a hex character, assume that has happened | |
659 | and try to fetch another packet to read. */ | |
660 | while ((buf[0] < '0' || buf[0] > '9') | |
661 | && (buf[0] < 'a' || buf[0] > 'f')) | |
662 | { | |
d0d8484a | 663 | if (remote_debug) |
981a3309 SG |
664 | printf ("Bad register packet; fetching a new packet\n"); |
665 | getpkt (buf, 0); | |
666 | } | |
667 | ||
bd5635a1 RP |
668 | /* Reply describes registers byte by byte, each byte encoded as two |
669 | hex characters. Suck them all up, then supply them to the | |
670 | register cacheing/storage mechanism. */ | |
671 | ||
672 | p = buf; | |
673 | for (i = 0; i < REGISTER_BYTES; i++) | |
674 | { | |
55fea07b JK |
675 | if (p[0] == 0) |
676 | break; | |
677 | if (p[1] == 0) | |
678 | { | |
679 | warning ("Remote reply is of odd length: %s", buf); | |
680 | /* Don't change register_bytes_found in this case, and don't | |
681 | print a second warning. */ | |
682 | goto supply_them; | |
683 | } | |
bd5635a1 RP |
684 | regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); |
685 | p += 2; | |
686 | } | |
55fea07b JK |
687 | |
688 | if (i != register_bytes_found) | |
689 | { | |
690 | register_bytes_found = i; | |
691 | #ifdef REGISTER_BYTES_OK | |
692 | if (!REGISTER_BYTES_OK (i)) | |
693 | warning ("Remote reply is too short: %s", buf); | |
694 | #endif | |
695 | } | |
696 | ||
697 | supply_them: | |
bd5635a1 RP |
698 | for (i = 0; i < NUM_REGS; i++) |
699 | supply_register (i, ®s[REGISTER_BYTE(i)]); | |
bd5635a1 RP |
700 | } |
701 | ||
702 | /* Prepare to store registers. Since we send them all, we have to | |
703 | read out the ones we don't want to change first. */ | |
704 | ||
b543979c | 705 | static void |
bd5635a1 RP |
706 | remote_prepare_to_store () |
707 | { | |
34517ebc JG |
708 | /* Make sure the entire registers array is valid. */ |
709 | read_register_bytes (0, (char *)NULL, REGISTER_BYTES); | |
bd5635a1 RP |
710 | } |
711 | ||
712 | /* Store the remote registers from the contents of the block REGISTERS. | |
713 | FIXME, eventually just store one register if that's all that is needed. */ | |
714 | ||
e1ce8aa5 | 715 | /* ARGSUSED */ |
b543979c | 716 | static void |
bd5635a1 RP |
717 | remote_store_registers (regno) |
718 | int regno; | |
719 | { | |
720 | char buf[PBUFSIZ]; | |
721 | int i; | |
722 | char *p; | |
723 | ||
724 | buf[0] = 'G'; | |
725 | ||
726 | /* Command describes registers byte by byte, | |
727 | each byte encoded as two hex characters. */ | |
728 | ||
729 | p = buf + 1; | |
55fea07b JK |
730 | /* remote_prepare_to_store insures that register_bytes_found gets set. */ |
731 | for (i = 0; i < register_bytes_found; i++) | |
bd5635a1 RP |
732 | { |
733 | *p++ = tohex ((registers[i] >> 4) & 0xf); | |
734 | *p++ = tohex (registers[i] & 0xf); | |
735 | } | |
736 | *p = '\0'; | |
737 | ||
738 | remote_send (buf); | |
bd5635a1 RP |
739 | } |
740 | ||
b43e0347 JK |
741 | #if 0 |
742 | ||
743 | /* Use of the data cache is disabled because it loses for looking at | |
744 | and changing hardware I/O ports and the like. Accepting `volatile' | |
745 | would perhaps be one way to fix it, but a better way which would | |
746 | win for more cases would be to use the executable file for the text | |
747 | segment, like the `icache' code below but done cleanly (in some | |
748 | target-independent place, perhaps in target_xfer_memory, perhaps | |
749 | based on assigning each target a speed or perhaps by some simpler | |
750 | mechanism). */ | |
751 | ||
bd5635a1 RP |
752 | /* Read a word from remote address ADDR and return it. |
753 | This goes through the data cache. */ | |
754 | ||
b43e0347 | 755 | static int |
bd5635a1 RP |
756 | remote_fetch_word (addr) |
757 | CORE_ADDR addr; | |
758 | { | |
d538b510 | 759 | #if 0 |
bd5635a1 RP |
760 | if (icache) |
761 | { | |
762 | extern CORE_ADDR text_start, text_end; | |
763 | ||
764 | if (addr >= text_start && addr < text_end) | |
765 | { | |
766 | int buffer; | |
767 | xfer_core_file (addr, &buffer, sizeof (int)); | |
768 | return buffer; | |
769 | } | |
770 | } | |
d538b510 RP |
771 | #endif |
772 | return dcache_fetch (remote_dcache, addr); | |
bd5635a1 RP |
773 | } |
774 | ||
775 | /* Write a word WORD into remote address ADDR. | |
776 | This goes through the data cache. */ | |
777 | ||
b43e0347 | 778 | static void |
bd5635a1 RP |
779 | remote_store_word (addr, word) |
780 | CORE_ADDR addr; | |
781 | int word; | |
782 | { | |
d538b510 | 783 | dcache_poke (remote_dcache, addr, word); |
bd5635a1 | 784 | } |
b43e0347 | 785 | #endif /* 0 */ |
bd5635a1 RP |
786 | \f |
787 | /* Write memory data directly to the remote machine. | |
788 | This does not inform the data cache; the data cache uses this. | |
789 | MEMADDR is the address in the remote memory space. | |
790 | MYADDR is the address of the buffer in our space. | |
d538b510 | 791 | LEN is the number of bytes. |
bd5635a1 | 792 | |
d538b510 RP |
793 | Returns number of bytes transferred, or 0 for error. */ |
794 | ||
795 | static int | |
bd5635a1 RP |
796 | remote_write_bytes (memaddr, myaddr, len) |
797 | CORE_ADDR memaddr; | |
d538b510 | 798 | unsigned char *myaddr; |
bd5635a1 RP |
799 | int len; |
800 | { | |
801 | char buf[PBUFSIZ]; | |
802 | int i; | |
803 | char *p; | |
804 | ||
805 | if (len > PBUFSIZ / 2 - 20) | |
806 | abort (); | |
807 | ||
808 | sprintf (buf, "M%x,%x:", memaddr, len); | |
809 | ||
b543979c | 810 | /* We send target system values byte by byte, in increasing byte addresses, |
bd5635a1 RP |
811 | each byte encoded as two hex characters. */ |
812 | ||
813 | p = buf + strlen (buf); | |
814 | for (i = 0; i < len; i++) | |
815 | { | |
816 | *p++ = tohex ((myaddr[i] >> 4) & 0xf); | |
817 | *p++ = tohex (myaddr[i] & 0xf); | |
818 | } | |
819 | *p = '\0'; | |
820 | ||
d538b510 RP |
821 | putpkt (buf); |
822 | getpkt (buf, 0); | |
823 | ||
824 | if (buf[0] == 'E') | |
825 | { | |
826 | /* There is no correspondance between what the remote protocol uses | |
827 | for errors and errno codes. We would like a cleaner way of | |
828 | representing errors (big enough to include errno codes, bfd_error | |
829 | codes, and others). But for now just return EIO. */ | |
830 | errno = EIO; | |
831 | return 0; | |
832 | } | |
833 | return len; | |
bd5635a1 RP |
834 | } |
835 | ||
836 | /* Read memory data directly from the remote machine. | |
837 | This does not use the data cache; the data cache uses this. | |
838 | MEMADDR is the address in the remote memory space. | |
839 | MYADDR is the address of the buffer in our space. | |
d538b510 | 840 | LEN is the number of bytes. |
bd5635a1 | 841 | |
d538b510 RP |
842 | Returns number of bytes transferred, or 0 for error. */ |
843 | ||
844 | static int | |
bd5635a1 RP |
845 | remote_read_bytes (memaddr, myaddr, len) |
846 | CORE_ADDR memaddr; | |
d538b510 | 847 | unsigned char *myaddr; |
bd5635a1 RP |
848 | int len; |
849 | { | |
850 | char buf[PBUFSIZ]; | |
851 | int i; | |
852 | char *p; | |
853 | ||
854 | if (len > PBUFSIZ / 2 - 1) | |
855 | abort (); | |
856 | ||
857 | sprintf (buf, "m%x,%x", memaddr, len); | |
d538b510 RP |
858 | putpkt (buf); |
859 | getpkt (buf, 0); | |
860 | ||
861 | if (buf[0] == 'E') | |
862 | { | |
863 | /* There is no correspondance between what the remote protocol uses | |
864 | for errors and errno codes. We would like a cleaner way of | |
865 | representing errors (big enough to include errno codes, bfd_error | |
866 | codes, and others). But for now just return EIO. */ | |
867 | errno = EIO; | |
868 | return 0; | |
869 | } | |
bd5635a1 | 870 | |
b543979c | 871 | /* Reply describes memory byte by byte, |
bd5635a1 RP |
872 | each byte encoded as two hex characters. */ |
873 | ||
874 | p = buf; | |
875 | for (i = 0; i < len; i++) | |
876 | { | |
877 | if (p[0] == 0 || p[1] == 0) | |
d538b510 RP |
878 | /* Reply is short. This means that we were able to read only part |
879 | of what we wanted to. */ | |
880 | break; | |
bd5635a1 RP |
881 | myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]); |
882 | p += 2; | |
883 | } | |
d538b510 | 884 | return i; |
bd5635a1 RP |
885 | } |
886 | \f | |
887 | /* Read or write LEN bytes from inferior memory at MEMADDR, transferring | |
e1ce8aa5 | 888 | to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is |
bd5635a1 RP |
889 | nonzero. Returns length of data written or read; 0 for error. */ |
890 | ||
b543979c JG |
891 | /* ARGSUSED */ |
892 | static int | |
893 | remote_xfer_memory(memaddr, myaddr, len, should_write, target) | |
bd5635a1 RP |
894 | CORE_ADDR memaddr; |
895 | char *myaddr; | |
896 | int len; | |
e1ce8aa5 | 897 | int should_write; |
b543979c | 898 | struct target_ops *target; /* ignored */ |
bd5635a1 | 899 | { |
bd5635a1 | 900 | int xfersize; |
d538b510 RP |
901 | int bytes_xferred; |
902 | int total_xferred = 0; | |
903 | ||
bd5635a1 RP |
904 | while (len > 0) |
905 | { | |
906 | if (len > MAXBUFBYTES) | |
907 | xfersize = MAXBUFBYTES; | |
908 | else | |
909 | xfersize = len; | |
910 | ||
e1ce8aa5 | 911 | if (should_write) |
d538b510 | 912 | bytes_xferred = remote_write_bytes (memaddr, myaddr, xfersize); |
bd5635a1 | 913 | else |
d538b510 RP |
914 | bytes_xferred = remote_read_bytes (memaddr, myaddr, xfersize); |
915 | ||
916 | /* If we get an error, we are done xferring. */ | |
917 | if (bytes_xferred == 0) | |
918 | break; | |
919 | ||
920 | memaddr += bytes_xferred; | |
921 | myaddr += bytes_xferred; | |
922 | len -= bytes_xferred; | |
923 | total_xferred += bytes_xferred; | |
bd5635a1 | 924 | } |
d538b510 | 925 | return total_xferred; |
bd5635a1 RP |
926 | } |
927 | ||
b543979c | 928 | static void |
8f86a4e4 | 929 | remote_files_info (ignore) |
5af4f5f6 | 930 | struct target_ops *ignore; |
bd5635a1 | 931 | { |
7c622b41 | 932 | puts_filtered ("Debugging a target over a serial line.\n"); |
bd5635a1 RP |
933 | } |
934 | \f | |
e50ebec8 JK |
935 | /* Stuff for dealing with the packets which are part of this protocol. |
936 | See comment at top of file for details. */ | |
bd5635a1 | 937 | |
ebdb9ade | 938 | /* Read a single character from the remote end, masking it down to 7 bits. */ |
b543979c | 939 | |
bd5635a1 RP |
940 | static int |
941 | readchar () | |
942 | { | |
ebdb9ade | 943 | int ch; |
bd5635a1 | 944 | |
ebdb9ade | 945 | ch = SERIAL_READCHAR (remote_desc, timeout); |
fce7f2d9 | 946 | |
ebdb9ade JK |
947 | if (ch < 0) |
948 | return ch; | |
bd5635a1 | 949 | |
ebdb9ade | 950 | return ch & 0x7f; |
bd5635a1 RP |
951 | } |
952 | ||
953 | /* Send the command in BUF to the remote machine, | |
954 | and read the reply into BUF. | |
955 | Report an error if we get an error reply. */ | |
956 | ||
957 | static void | |
958 | remote_send (buf) | |
959 | char *buf; | |
960 | { | |
961 | ||
962 | putpkt (buf); | |
7c622b41 | 963 | getpkt (buf, 0); |
bd5635a1 RP |
964 | |
965 | if (buf[0] == 'E') | |
966 | error ("Remote failure reply: %s", buf); | |
967 | } | |
968 | ||
969 | /* Send a packet to the remote machine, with error checking. | |
970 | The data of the packet is in BUF. */ | |
971 | ||
972 | static void | |
973 | putpkt (buf) | |
974 | char *buf; | |
975 | { | |
976 | int i; | |
977 | unsigned char csum = 0; | |
b543979c | 978 | char buf2[PBUFSIZ]; |
bd5635a1 | 979 | int cnt = strlen (buf); |
ebdb9ade | 980 | int ch; |
bd5635a1 RP |
981 | char *p; |
982 | ||
983 | /* Copy the packet into buffer BUF2, encapsulating it | |
984 | and giving it a checksum. */ | |
985 | ||
b543979c JG |
986 | if (cnt > sizeof(buf2) - 5) /* Prosanity check */ |
987 | abort(); | |
988 | ||
bd5635a1 RP |
989 | p = buf2; |
990 | *p++ = '$'; | |
991 | ||
992 | for (i = 0; i < cnt; i++) | |
993 | { | |
994 | csum += buf[i]; | |
995 | *p++ = buf[i]; | |
996 | } | |
997 | *p++ = '#'; | |
998 | *p++ = tohex ((csum >> 4) & 0xf); | |
999 | *p++ = tohex (csum & 0xf); | |
1000 | ||
1001 | /* Send it over and over until we get a positive ack. */ | |
1002 | ||
6b27ebe8 JK |
1003 | while (1) |
1004 | { | |
d0d8484a | 1005 | if (remote_debug) |
6b27ebe8 JK |
1006 | { |
1007 | *p = '\0'; | |
1008 | printf ("Sending packet: %s...", buf2); fflush(stdout); | |
1009 | } | |
1010 | if (SERIAL_WRITE (remote_desc, buf2, p - buf2)) | |
1011 | perror_with_name ("putpkt: write failed"); | |
1012 | ||
1013 | /* read until either a timeout occurs (-2) or '+' is read */ | |
1014 | while (1) | |
1015 | { | |
1016 | ch = readchar (); | |
1017 | ||
1018 | switch (ch) | |
1019 | { | |
1020 | case '+': | |
d0d8484a | 1021 | if (remote_debug) |
6b27ebe8 JK |
1022 | printf("Ack\n"); |
1023 | return; | |
1024 | case SERIAL_TIMEOUT: | |
1025 | break; /* Retransmit buffer */ | |
1026 | case SERIAL_ERROR: | |
1027 | perror_with_name ("putpkt: couldn't read ACK"); | |
1028 | case SERIAL_EOF: | |
1029 | error ("putpkt: EOF while trying to read ACK"); | |
1030 | default: | |
d0d8484a | 1031 | if (remote_debug) |
6b27ebe8 JK |
1032 | printf ("%02X %c ", ch&0xFF, ch); |
1033 | continue; | |
1034 | } | |
1035 | break; /* Here to retransmit */ | |
1036 | } | |
981a3309 SG |
1037 | |
1038 | if (quit_flag) | |
1039 | { | |
1040 | quit_flag = 0; | |
1041 | interrupt_query (); | |
1042 | } | |
6b27ebe8 | 1043 | } |
bd5635a1 RP |
1044 | } |
1045 | ||
1046 | /* Read a packet from the remote machine, with error checking, | |
7c622b41 JG |
1047 | and store it in BUF. BUF is expected to be of size PBUFSIZ. |
1048 | If FOREVER, wait forever rather than timing out; this is used | |
1049 | while the target is executing user code. */ | |
bd5635a1 RP |
1050 | |
1051 | static void | |
7c622b41 | 1052 | getpkt (buf, forever) |
bd5635a1 | 1053 | char *buf; |
ebdb9ade | 1054 | int forever; |
bd5635a1 RP |
1055 | { |
1056 | char *bp; | |
1057 | unsigned char csum; | |
7c622b41 | 1058 | int c = 0; |
bd5635a1 | 1059 | unsigned char c1, c2; |
38094c60 JG |
1060 | int retries = 0; |
1061 | #define MAX_RETRIES 10 | |
bd5635a1 | 1062 | |
bd5635a1 RP |
1063 | while (1) |
1064 | { | |
981a3309 SG |
1065 | if (quit_flag) |
1066 | { | |
1067 | quit_flag = 0; | |
1068 | interrupt_query (); | |
1069 | } | |
1070 | ||
7c622b41 JG |
1071 | /* This can loop forever if the remote side sends us characters |
1072 | continuously, but if it pauses, we'll get a zero from readchar | |
1073 | because of timeout. Then we'll count that as a retry. */ | |
6b27ebe8 JK |
1074 | |
1075 | c = readchar(); | |
1076 | if (c > 0 && c != '$') | |
1077 | continue; | |
1078 | ||
1079 | if (c == SERIAL_TIMEOUT) | |
1080 | { | |
1081 | if (forever) | |
1082 | continue; | |
1083 | if (++retries >= MAX_RETRIES) | |
d0d8484a | 1084 | if (remote_debug) puts_filtered ("Timed out.\n"); |
6b27ebe8 JK |
1085 | goto out; |
1086 | } | |
1087 | ||
1088 | if (c == SERIAL_EOF) | |
1089 | error ("Remote connection closed"); | |
1090 | if (c == SERIAL_ERROR) | |
1091 | perror_with_name ("Remote communication error"); | |
7c622b41 | 1092 | |
bd5635a1 RP |
1093 | /* Force csum to be zero here because of possible error retry. */ |
1094 | csum = 0; | |
bd5635a1 | 1095 | bp = buf; |
7c622b41 | 1096 | |
bd5635a1 RP |
1097 | while (1) |
1098 | { | |
1099 | c = readchar (); | |
ebdb9ade | 1100 | if (c == SERIAL_TIMEOUT) |
7c622b41 | 1101 | { |
d0d8484a | 1102 | if (remote_debug) |
7c622b41 JG |
1103 | puts_filtered ("Timeout in mid-packet, retrying\n"); |
1104 | goto whole; /* Start a new packet, count retries */ | |
1105 | } | |
1106 | if (c == '$') | |
1107 | { | |
d0d8484a | 1108 | if (remote_debug) |
7c622b41 JG |
1109 | puts_filtered ("Saw new packet start in middle of old one\n"); |
1110 | goto whole; /* Start a new packet, count retries */ | |
1111 | } | |
bd5635a1 RP |
1112 | if (c == '#') |
1113 | break; | |
8f86a4e4 JG |
1114 | if (bp >= buf+PBUFSIZ-1) |
1115 | { | |
1116 | *bp = '\0'; | |
7c622b41 JG |
1117 | puts_filtered ("Remote packet too long: "); |
1118 | puts_filtered (buf); | |
1119 | puts_filtered ("\n"); | |
8f86a4e4 JG |
1120 | goto whole; |
1121 | } | |
bd5635a1 RP |
1122 | *bp++ = c; |
1123 | csum += c; | |
1124 | } | |
1125 | *bp = 0; | |
1126 | ||
1127 | c1 = fromhex (readchar ()); | |
1128 | c2 = fromhex (readchar ()); | |
1129 | if ((csum & 0xff) == (c1 << 4) + c2) | |
1130 | break; | |
7c622b41 JG |
1131 | printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=", |
1132 | (c1 << 4) + c2, csum & 0xff); | |
1133 | puts_filtered (buf); | |
1134 | puts_filtered ("\n"); | |
38094c60 | 1135 | |
8f86a4e4 JG |
1136 | /* Try the whole thing again. */ |
1137 | whole: | |
38094c60 JG |
1138 | if (++retries < MAX_RETRIES) |
1139 | { | |
ebdb9ade | 1140 | SERIAL_WRITE (remote_desc, "-", 1); |
38094c60 JG |
1141 | } |
1142 | else | |
1143 | { | |
1144 | printf ("Ignoring packet error, continuing...\n"); | |
1145 | break; | |
1146 | } | |
bd5635a1 RP |
1147 | } |
1148 | ||
7c622b41 JG |
1149 | out: |
1150 | ||
ebdb9ade | 1151 | SERIAL_WRITE (remote_desc, "+", 1); |
bd5635a1 | 1152 | |
d0d8484a | 1153 | if (remote_debug) |
8f86a4e4 | 1154 | fprintf (stderr,"Packet received: %s\n", buf); |
bd5635a1 RP |
1155 | } |
1156 | \f | |
ebdb9ade JK |
1157 | static void |
1158 | remote_kill () | |
1159 | { | |
1160 | putpkt ("k"); | |
1161 | /* Don't wait for it to die. I'm not really sure it matters whether | |
1162 | we do or not. For the existing stubs, kill is a noop. */ | |
1163 | target_mourn_inferior (); | |
1164 | } | |
bd5635a1 | 1165 | |
ebdb9ade JK |
1166 | static void |
1167 | remote_mourn () | |
1168 | { | |
1169 | unpush_target (&remote_ops); | |
1170 | generic_mourn_inferior (); | |
1171 | } | |
1172 | \f | |
5af4f5f6 JK |
1173 | #ifdef REMOTE_BREAKPOINT |
1174 | ||
1175 | /* On some machines, e.g. 68k, we may use a different breakpoint instruction | |
1176 | than other targets. */ | |
1177 | static unsigned char break_insn[] = REMOTE_BREAKPOINT; | |
1178 | ||
1179 | /* Check that it fits in BREAKPOINT_MAX bytes. */ | |
1180 | static unsigned char check_break_insn_size[BREAKPOINT_MAX] = REMOTE_BREAKPOINT; | |
1181 | ||
1182 | #else /* No REMOTE_BREAKPOINT. */ | |
1183 | ||
1184 | /* Same old breakpoint instruction. This code does nothing different | |
1185 | than mem-break.c. */ | |
1186 | static unsigned char break_insn[] = BREAKPOINT; | |
1187 | ||
1188 | #endif /* No REMOTE_BREAKPOINT. */ | |
1189 | ||
1190 | /* Insert a breakpoint on targets that don't have any better breakpoint | |
1191 | support. We read the contents of the target location and stash it, | |
1192 | then overwrite it with a breakpoint instruction. ADDR is the target | |
1193 | location in the target machine. CONTENTS_CACHE is a pointer to | |
1194 | memory allocated for saving the target contents. It is guaranteed | |
1195 | by the caller to be long enough to save sizeof BREAKPOINT bytes (this | |
1196 | is accomplished via BREAKPOINT_MAX). */ | |
1197 | ||
d538b510 | 1198 | static int |
5af4f5f6 JK |
1199 | remote_insert_breakpoint (addr, contents_cache) |
1200 | CORE_ADDR addr; | |
1201 | char *contents_cache; | |
1202 | { | |
1203 | int val; | |
1204 | ||
1205 | val = target_read_memory (addr, contents_cache, sizeof break_insn); | |
1206 | ||
1207 | if (val == 0) | |
1208 | val = target_write_memory (addr, (char *)break_insn, sizeof break_insn); | |
1209 | ||
1210 | return val; | |
1211 | } | |
1212 | ||
d538b510 | 1213 | static int |
5af4f5f6 JK |
1214 | remote_remove_breakpoint (addr, contents_cache) |
1215 | CORE_ADDR addr; | |
1216 | char *contents_cache; | |
1217 | { | |
1218 | return target_write_memory (addr, contents_cache, sizeof break_insn); | |
1219 | } | |
1220 | \f | |
bd5635a1 RP |
1221 | /* Define the target subroutine names */ |
1222 | ||
1223 | struct target_ops remote_ops = { | |
b543979c JG |
1224 | "remote", /* to_shortname */ |
1225 | "Remote serial target in gdb-specific protocol", /* to_longname */ | |
1226 | "Use a remote computer via a serial line, using a gdb-specific protocol.\n\ | |
1227 | Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */ | |
1228 | remote_open, /* to_open */ | |
1229 | remote_close, /* to_close */ | |
1230 | NULL, /* to_attach */ | |
1231 | remote_detach, /* to_detach */ | |
1232 | remote_resume, /* to_resume */ | |
1233 | remote_wait, /* to_wait */ | |
1234 | remote_fetch_registers, /* to_fetch_registers */ | |
1235 | remote_store_registers, /* to_store_registers */ | |
1236 | remote_prepare_to_store, /* to_prepare_to_store */ | |
b543979c JG |
1237 | remote_xfer_memory, /* to_xfer_memory */ |
1238 | remote_files_info, /* to_files_info */ | |
5af4f5f6 JK |
1239 | |
1240 | remote_insert_breakpoint, /* to_insert_breakpoint */ | |
1241 | remote_remove_breakpoint, /* to_remove_breakpoint */ | |
1242 | ||
b543979c JG |
1243 | NULL, /* to_terminal_init */ |
1244 | NULL, /* to_terminal_inferior */ | |
1245 | NULL, /* to_terminal_ours_for_output */ | |
1246 | NULL, /* to_terminal_ours */ | |
1247 | NULL, /* to_terminal_info */ | |
ebdb9ade | 1248 | remote_kill, /* to_kill */ |
6b27ebe8 | 1249 | generic_load, /* to_load */ |
b543979c JG |
1250 | NULL, /* to_lookup_symbol */ |
1251 | NULL, /* to_create_inferior */ | |
ebdb9ade | 1252 | remote_mourn, /* to_mourn_inferior */ |
34517ebc | 1253 | 0, /* to_can_run */ |
7c622b41 | 1254 | 0, /* to_notice_signals */ |
b543979c JG |
1255 | process_stratum, /* to_stratum */ |
1256 | NULL, /* to_next */ | |
1257 | 1, /* to_has_all_memory */ | |
1258 | 1, /* to_has_memory */ | |
1259 | 1, /* to_has_stack */ | |
1260 | 1, /* to_has_registers */ | |
1261 | 1, /* to_has_execution */ | |
1262 | NULL, /* sections */ | |
1263 | NULL, /* sections_end */ | |
1264 | OPS_MAGIC /* to_magic */ | |
bd5635a1 RP |
1265 | }; |
1266 | ||
1267 | void | |
1268 | _initialize_remote () | |
1269 | { | |
1270 | add_target (&remote_ops); | |
1271 | } | |
8f86a4e4 | 1272 | #endif |