Commit | Line | Data |
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b543979c | 1 | /* Remote target communications for serial-line targets in custom GDB protocol |
94d4b713 | 2 | Copyright 1988, 1991, 1992, 1993, 1994 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 | |
72bba93b | 93 | or... WAA The process exited, and AA is |
758aeb93 ILT |
94 | the exit status. This is only |
95 | applicable for certains sorts of | |
96 | targets. | |
d538b510 RP |
97 | kill request k |
98 | ||
99 | toggle debug d toggle debug flag (see 386 & 68k stubs) | |
100 | reset r reset -- see sparc stub. | |
101 | reserved <other> On other requests, the stub should | |
102 | ignore the request and send an empty | |
103 | response ($#<checksum>). This way | |
104 | we can extend the protocol and GDB | |
105 | can tell whether the stub it is | |
106 | talking to uses the old or the new. | |
72bba93b SG |
107 | <<<<<<< remote.c |
108 | search tAA:PP,MM Search backwards starting at address | |
109 | ||||||| 1.81 | |
110 | search tAA:PP,MM Search backword starting at address | |
111 | ======= | |
94d4b713 | 112 | search tAA:PP,MM Search backward starting at address |
72bba93b | 113 | >>>>>>> 1.82 |
94d4b713 JK |
114 | AA for a match with pattern PP and |
115 | mask MM. PP and MM are 4 bytes. | |
116 | Not supported by all stubs. | |
117 | ||
72bba93b SG |
118 | <<<<<<< remote.c |
119 | general query qXXXX Request info about XXXX. | |
120 | general set QXXXX=yyyy Set value of XXXX to yyyy. | |
121 | query sect offs qOffsets Get section offsets. Reply is | |
122 | Text=xxx;Data=yyy;Bss=zzz | |
123 | */ | |
124 | ||
125 | ||||||| 1.81 | |
126 | ======= | |
94d4b713 JK |
127 | Responses can be run-length encoded to save space. A '*' means that |
128 | the next two characters are hex digits giving a repeat count which | |
129 | stands for that many repititions of the character preceding the '*'. | |
130 | Note that this means that responses cannot contain '*'. Example: | |
131 | "0*03" means the same as "0000". */ | |
bd5635a1 | 132 | |
72bba93b | 133 | >>>>>>> 1.82 |
d747e0af | 134 | #include "defs.h" |
bd5635a1 RP |
135 | #include <string.h> |
136 | #include <fcntl.h> | |
bd5635a1 RP |
137 | #include "frame.h" |
138 | #include "inferior.h" | |
e50ebec8 | 139 | #include "bfd.h" |
6b27ebe8 | 140 | #include "symfile.h" |
bd5635a1 RP |
141 | #include "target.h" |
142 | #include "wait.h" | |
143 | #include "terminal.h" | |
8f86a4e4 | 144 | #include "gdbcmd.h" |
758aeb93 ILT |
145 | #include "objfiles.h" |
146 | #include "gdb-stabs.h" | |
bd5635a1 | 147 | |
d538b510 RP |
148 | #include "dcache.h" |
149 | ||
8f86a4e4 | 150 | #if !defined(DONT_USE_REMOTE) |
bd5635a1 RP |
151 | #ifdef USG |
152 | #include <sys/types.h> | |
153 | #endif | |
154 | ||
155 | #include <signal.h> | |
ebdb9ade | 156 | #include "serial.h" |
bd5635a1 | 157 | |
b543979c JG |
158 | /* Prototypes for local functions */ |
159 | ||
d538b510 RP |
160 | static int |
161 | remote_write_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len)); | |
b543979c | 162 | |
d538b510 RP |
163 | static int |
164 | remote_read_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len)); | |
b543979c JG |
165 | |
166 | static void | |
5af4f5f6 | 167 | remote_files_info PARAMS ((struct target_ops *ignore)); |
b543979c JG |
168 | |
169 | static int | |
5af4f5f6 JK |
170 | remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len, |
171 | int should_write, struct target_ops *target)); | |
b543979c JG |
172 | |
173 | static void | |
174 | remote_prepare_to_store PARAMS ((void)); | |
175 | ||
176 | static void | |
5af4f5f6 | 177 | remote_fetch_registers PARAMS ((int regno)); |
b543979c JG |
178 | |
179 | static void | |
94d4b713 | 180 | remote_resume PARAMS ((int pid, int step, enum target_signal siggnal)); |
b543979c | 181 | |
7c622b41 | 182 | static int |
5af4f5f6 | 183 | remote_start_remote PARAMS ((char *dummy)); |
7c622b41 | 184 | |
b543979c | 185 | static void |
5af4f5f6 | 186 | remote_open PARAMS ((char *name, int from_tty)); |
b543979c JG |
187 | |
188 | static void | |
5af4f5f6 | 189 | remote_close PARAMS ((int quitting)); |
b543979c JG |
190 | |
191 | static void | |
5af4f5f6 | 192 | remote_store_registers PARAMS ((int regno)); |
b543979c JG |
193 | |
194 | static void | |
5af4f5f6 | 195 | getpkt PARAMS ((char *buf, int forever)); |
b543979c JG |
196 | |
197 | static void | |
5af4f5f6 | 198 | putpkt PARAMS ((char *buf)); |
b543979c JG |
199 | |
200 | static void | |
5af4f5f6 | 201 | remote_send PARAMS ((char *buf)); |
b543979c JG |
202 | |
203 | static int | |
204 | readchar PARAMS ((void)); | |
205 | ||
94d4b713 | 206 | static int remote_wait PARAMS ((int pid, struct target_waitstatus *status)); |
b543979c JG |
207 | |
208 | static int | |
5af4f5f6 | 209 | tohex PARAMS ((int nib)); |
b543979c JG |
210 | |
211 | static int | |
5af4f5f6 | 212 | fromhex PARAMS ((int a)); |
b543979c JG |
213 | |
214 | static void | |
5af4f5f6 JK |
215 | remote_detach PARAMS ((char *args, int from_tty)); |
216 | ||
217 | static void | |
218 | remote_interrupt PARAMS ((int signo)); | |
219 | ||
220 | static void | |
221 | remote_interrupt_twice PARAMS ((int signo)); | |
b543979c | 222 | |
981a3309 SG |
223 | static void |
224 | interrupt_query PARAMS ((void)); | |
225 | ||
bd5635a1 RP |
226 | extern struct target_ops remote_ops; /* Forward decl */ |
227 | ||
ebdb9ade JK |
228 | /* This was 5 seconds, which is a long time to sit and wait. |
229 | Unless this is going though some terminal server or multiplexer or | |
230 | other form of hairy serial connection, I would think 2 seconds would | |
231 | be plenty. */ | |
232 | static int timeout = 2; | |
bd5635a1 RP |
233 | |
234 | #if 0 | |
235 | int icache; | |
236 | #endif | |
237 | ||
16e1d1d3 | 238 | /* Descriptor for I/O to remote machine. Initialize it to NULL so that |
bd5635a1 RP |
239 | remote_open knows that we don't have a file open when the program |
240 | starts. */ | |
ebdb9ade | 241 | serial_t remote_desc = NULL; |
bd5635a1 | 242 | |
4d57c599 JK |
243 | /* Having this larger than 400 causes us to be incompatible with m68k-stub.c |
244 | and i386-stub.c. Normally, no one would notice because it only matters | |
245 | for writing large chunks of memory (e.g. in downloads). Also, this needs | |
246 | to be more than 400 if required to hold the registers (see below, where | |
247 | we round it up based on REGISTER_BYTES). */ | |
248 | #define PBUFSIZ 400 | |
bd5635a1 RP |
249 | |
250 | /* Maximum number of bytes to read/write at once. The value here | |
251 | is chosen to fill up a packet (the headers account for the 32). */ | |
252 | #define MAXBUFBYTES ((PBUFSIZ-32)/2) | |
253 | ||
b543979c JG |
254 | /* Round up PBUFSIZ to hold all the registers, at least. */ |
255 | #if REGISTER_BYTES > MAXBUFBYTES | |
256 | #undef PBUFSIZ | |
257 | #define PBUFSIZ (REGISTER_BYTES * 2 + 32) | |
bd5635a1 | 258 | #endif |
bd5635a1 | 259 | \f |
bd5635a1 RP |
260 | /* Clean up connection to a remote debugger. */ |
261 | ||
e1ce8aa5 | 262 | /* ARGSUSED */ |
b543979c | 263 | static void |
bd5635a1 RP |
264 | remote_close (quitting) |
265 | int quitting; | |
266 | { | |
ebdb9ade JK |
267 | if (remote_desc) |
268 | SERIAL_CLOSE (remote_desc); | |
269 | remote_desc = NULL; | |
b543979c JG |
270 | } |
271 | ||
72bba93b SG |
272 | /* Query the remote side for the text, data and bss offsets. */ |
273 | ||
274 | static void | |
275 | get_offsets () | |
276 | { | |
277 | unsigned char buf [PBUFSIZ]; | |
278 | int nvals; | |
279 | CORE_ADDR text_addr, data_addr, bss_addr; | |
280 | struct section_offsets *offs; | |
281 | ||
282 | putpkt ("qOffsets"); | |
283 | ||
284 | getpkt (buf, 1); | |
285 | ||
286 | if (buf[0] == 'E') | |
287 | { | |
288 | warning ("Remote failure reply: %s", buf); | |
289 | return; | |
290 | } | |
291 | ||
292 | nvals = sscanf (buf, "Text=%lx;Data=%lx;Bss=%lx", &text_addr, &data_addr, | |
293 | &bss_addr); | |
294 | if (nvals != 3) | |
295 | error ("Malformed response to offset query, %s", buf); | |
296 | ||
297 | if (symfile_objfile == NULL) | |
298 | return; | |
299 | ||
300 | offs = (struct section_offsets *) alloca (sizeof (struct section_offsets) | |
301 | + symfile_objfile->num_sections | |
302 | * sizeof (offs->offsets)); | |
303 | memcpy (offs, symfile_objfile->section_offsets, | |
304 | sizeof (struct section_offsets) | |
305 | + symfile_objfile->num_sections | |
306 | * sizeof (offs->offsets)); | |
307 | ||
308 | ANOFFSET (offs, SECT_OFF_TEXT) = text_addr; | |
309 | ANOFFSET (offs, SECT_OFF_DATA) = data_addr; | |
310 | ANOFFSET (offs, SECT_OFF_BSS) = bss_addr; | |
311 | ||
312 | objfile_relocate (symfile_objfile, offs); | |
313 | } | |
314 | ||
7c622b41 JG |
315 | /* Stub for catch_errors. */ |
316 | ||
317 | static int | |
318 | remote_start_remote (dummy) | |
319 | char *dummy; | |
320 | { | |
ac7a377f JK |
321 | immediate_quit = 1; /* Allow user to interrupt it */ |
322 | ||
7c622b41 | 323 | /* Ack any packet which the remote side has already sent. */ |
72bba93b SG |
324 | |
325 | SERIAL_WRITE (remote_desc, "+", 1); | |
326 | ||
327 | get_offsets (); /* Get text, data & bss offsets */ | |
328 | ||
7c622b41 | 329 | putpkt ("?"); /* initiate a query from remote machine */ |
ac7a377f | 330 | immediate_quit = 0; |
7c622b41 JG |
331 | |
332 | start_remote (); /* Initialize gdb process mechanisms */ | |
72bba93b | 333 | |
7c622b41 JG |
334 | return 1; |
335 | } | |
336 | ||
bd5635a1 RP |
337 | /* Open a connection to a remote debugger. |
338 | NAME is the filename used for communication. */ | |
339 | ||
d538b510 RP |
340 | static DCACHE *remote_dcache; |
341 | ||
b543979c | 342 | static void |
bd5635a1 RP |
343 | remote_open (name, from_tty) |
344 | char *name; | |
345 | int from_tty; | |
346 | { | |
bd5635a1 RP |
347 | if (name == 0) |
348 | error ( | |
349 | "To open a remote debug connection, you need to specify what serial\n\ | |
350 | device is attached to the remote system (e.g. /dev/ttya)."); | |
351 | ||
f2fc6e7a JK |
352 | target_preopen (from_tty); |
353 | ||
ebdb9ade | 354 | unpush_target (&remote_ops); |
bd5635a1 | 355 | |
d538b510 | 356 | remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes); |
bd5635a1 | 357 | |
ebdb9ade JK |
358 | remote_desc = SERIAL_OPEN (name); |
359 | if (!remote_desc) | |
bd5635a1 RP |
360 | perror_with_name (name); |
361 | ||
94d4b713 | 362 | if (baud_rate != -1) |
b543979c | 363 | { |
94d4b713 JK |
364 | if (SERIAL_SETBAUDRATE (remote_desc, baud_rate)) |
365 | { | |
366 | SERIAL_CLOSE (remote_desc); | |
367 | perror_with_name (name); | |
368 | } | |
b543979c | 369 | } |
ebdb9ade JK |
370 | |
371 | SERIAL_RAW (remote_desc); | |
bd5635a1 | 372 | |
e15f2a54 JK |
373 | /* If there is something sitting in the buffer we might take it as a |
374 | response to a command, which would be bad. */ | |
375 | SERIAL_FLUSH_INPUT (remote_desc); | |
376 | ||
bd5635a1 | 377 | if (from_tty) |
7c622b41 JG |
378 | { |
379 | puts_filtered ("Remote debugging using "); | |
380 | puts_filtered (name); | |
381 | puts_filtered ("\n"); | |
382 | } | |
bd5635a1 | 383 | push_target (&remote_ops); /* Switch to using remote target now */ |
bd5635a1 | 384 | |
ac7a377f JK |
385 | /* Start the remote connection; if error (0), discard this target. |
386 | In particular, if the user quits, be sure to discard it | |
387 | (we'd be in an inconsistent state otherwise). */ | |
7c622b41 | 388 | if (!catch_errors (remote_start_remote, (char *)0, |
e50ebec8 | 389 | "Couldn't establish connection to remote target\n", RETURN_MASK_ALL)) |
7c622b41 | 390 | pop_target(); |
bd5635a1 RP |
391 | } |
392 | ||
393 | /* remote_detach() | |
394 | takes a program previously attached to and detaches it. | |
395 | We better not have left any breakpoints | |
396 | in the program or it'll die when it hits one. | |
397 | Close the open connection to the remote debugger. | |
398 | Use this when you want to detach and do something else | |
399 | with your gdb. */ | |
400 | ||
401 | static void | |
402 | remote_detach (args, from_tty) | |
403 | char *args; | |
404 | int from_tty; | |
405 | { | |
406 | if (args) | |
407 | error ("Argument given to \"detach\" when remotely debugging."); | |
408 | ||
409 | pop_target (); | |
410 | if (from_tty) | |
7c622b41 | 411 | puts_filtered ("Ending remote debugging.\n"); |
bd5635a1 RP |
412 | } |
413 | ||
414 | /* Convert hex digit A to a number. */ | |
415 | ||
416 | static int | |
417 | fromhex (a) | |
418 | int a; | |
419 | { | |
420 | if (a >= '0' && a <= '9') | |
421 | return a - '0'; | |
422 | else if (a >= 'a' && a <= 'f') | |
423 | return a - 'a' + 10; | |
424 | else | |
425 | error ("Reply contains invalid hex digit"); | |
426 | return -1; | |
427 | } | |
428 | ||
429 | /* Convert number NIB to a hex digit. */ | |
430 | ||
431 | static int | |
432 | tohex (nib) | |
433 | int nib; | |
434 | { | |
435 | if (nib < 10) | |
436 | return '0'+nib; | |
437 | else | |
438 | return 'a'+nib-10; | |
439 | } | |
440 | \f | |
441 | /* Tell the remote machine to resume. */ | |
442 | ||
b543979c | 443 | static void |
d538b510 | 444 | remote_resume (pid, step, siggnal) |
94d4b713 JK |
445 | int pid, step; |
446 | enum target_signal siggnal; | |
bd5635a1 RP |
447 | { |
448 | char buf[PBUFSIZ]; | |
449 | ||
450 | if (siggnal) | |
ebdb9ade JK |
451 | { |
452 | char *name; | |
453 | target_terminal_ours_for_output (); | |
94d4b713 JK |
454 | printf_filtered |
455 | ("Can't send signals to a remote system. %s not sent.\n", | |
456 | target_signal_to_name (siggnal)); | |
ebdb9ade JK |
457 | target_terminal_inferior (); |
458 | } | |
bd5635a1 | 459 | |
d538b510 | 460 | dcache_flush (remote_dcache); |
bd5635a1 RP |
461 | |
462 | strcpy (buf, step ? "s": "c"); | |
463 | ||
464 | putpkt (buf); | |
465 | } | |
ebdb9ade | 466 | \f |
b543979c JG |
467 | /* Send ^C to target to halt it. Target will respond, and send us a |
468 | packet. */ | |
469 | ||
5af4f5f6 JK |
470 | static void |
471 | remote_interrupt (signo) | |
e676a15f | 472 | int signo; |
b543979c | 473 | { |
ebdb9ade JK |
474 | /* If this doesn't work, try more severe steps. */ |
475 | signal (signo, remote_interrupt_twice); | |
8f86a4e4 | 476 | |
d0d8484a | 477 | if (remote_debug) |
199b2450 | 478 | printf_unfiltered ("remote_interrupt called\n"); |
8f86a4e4 | 479 | |
ebdb9ade | 480 | SERIAL_WRITE (remote_desc, "\003", 1); /* Send a ^C */ |
b543979c JG |
481 | } |
482 | ||
5af4f5f6 JK |
483 | static void (*ofunc)(); |
484 | ||
ebdb9ade JK |
485 | /* The user typed ^C twice. */ |
486 | static void | |
487 | remote_interrupt_twice (signo) | |
488 | int signo; | |
489 | { | |
490 | signal (signo, ofunc); | |
491 | ||
981a3309 SG |
492 | interrupt_query (); |
493 | ||
494 | signal (signo, remote_interrupt); | |
495 | } | |
496 | ||
497 | /* Ask the user what to do when an interrupt is received. */ | |
498 | ||
499 | static void | |
500 | interrupt_query () | |
501 | { | |
ebdb9ade | 502 | target_terminal_ours (); |
981a3309 | 503 | |
6b27ebe8 | 504 | if (query ("Interrupted while waiting for the program.\n\ |
ebdb9ade JK |
505 | Give up (and stop debugging it)? ")) |
506 | { | |
507 | target_mourn_inferior (); | |
e50ebec8 | 508 | return_to_top_level (RETURN_QUIT); |
ebdb9ade | 509 | } |
981a3309 SG |
510 | |
511 | target_terminal_inferior (); | |
ebdb9ade | 512 | } |
b543979c | 513 | |
bd5635a1 | 514 | /* Wait until the remote machine stops, then return, |
e1ce8aa5 JK |
515 | storing status in STATUS just as `wait' would. |
516 | Returns "pid" (though it's not clear what, if anything, that | |
517 | means in the case of this target). */ | |
bd5635a1 | 518 | |
b543979c | 519 | static int |
d0d8484a SG |
520 | remote_wait (pid, status) |
521 | int pid; | |
94d4b713 | 522 | struct target_waitstatus *status; |
bd5635a1 RP |
523 | { |
524 | unsigned char buf[PBUFSIZ]; | |
8f86a4e4 | 525 | |
94d4b713 JK |
526 | status->kind = TARGET_WAITKIND_EXITED; |
527 | status->value.integer = 0; | |
b543979c | 528 | |
4f8a48e5 | 529 | while (1) |
8f86a4e4 | 530 | { |
4f8a48e5 | 531 | unsigned char *p; |
a03d4f8e | 532 | |
4f8a48e5 ILT |
533 | ofunc = (void (*)()) signal (SIGINT, remote_interrupt); |
534 | getpkt ((char *) buf, 1); | |
535 | signal (SIGINT, ofunc); | |
4ecee2f9 | 536 | |
4f8a48e5 ILT |
537 | if (buf[0] == 'E') |
538 | warning ("Remote failure reply: %s", buf); | |
539 | else if (buf[0] == 'T') | |
8f86a4e4 | 540 | { |
4f8a48e5 ILT |
541 | int i; |
542 | long regno; | |
543 | char regs[MAX_REGISTER_RAW_SIZE]; | |
a03d4f8e | 544 | |
4f8a48e5 ILT |
545 | /* Expedited reply, containing Signal, {regno, reg} repeat */ |
546 | /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where | |
547 | ss = signal number | |
548 | n... = register number | |
549 | r... = register contents | |
550 | */ | |
5af4f5f6 | 551 | |
4f8a48e5 | 552 | p = &buf[3]; /* after Txx */ |
5af4f5f6 | 553 | |
4f8a48e5 ILT |
554 | while (*p) |
555 | { | |
556 | unsigned char *p1; | |
5af4f5f6 | 557 | |
4f8a48e5 | 558 | regno = strtol (p, &p1, 16); /* Read the register number */ |
5af4f5f6 | 559 | |
4f8a48e5 ILT |
560 | if (p1 == p) |
561 | warning ("Remote sent badly formed register number: %s\nPacket: '%s'\n", | |
562 | p1, buf); | |
4ecee2f9 | 563 | |
4f8a48e5 | 564 | p = p1; |
4ecee2f9 | 565 | |
4f8a48e5 ILT |
566 | if (*p++ != ':') |
567 | warning ("Malformed packet (missing colon): %s\nPacket: '%s'\n", | |
568 | p, buf); | |
a03d4f8e | 569 | |
4f8a48e5 ILT |
570 | if (regno >= NUM_REGS) |
571 | warning ("Remote sent bad register number %d: %s\nPacket: '%s'\n", | |
572 | regno, p, buf); | |
573 | ||
574 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i++) | |
575 | { | |
576 | if (p[0] == 0 || p[1] == 0) | |
577 | warning ("Remote reply is too short: %s", buf); | |
578 | regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); | |
579 | p += 2; | |
580 | } | |
581 | ||
582 | if (*p++ != ';') | |
583 | warning ("Remote register badly formatted: %s", buf); | |
584 | ||
585 | supply_register (regno, regs); | |
586 | } | |
587 | break; | |
8f86a4e4 | 588 | } |
4f8a48e5 ILT |
589 | else if (buf[0] == 'W') |
590 | { | |
591 | /* The remote process exited. */ | |
94d4b713 JK |
592 | status->kind = TARGET_WAITKIND_EXITED; |
593 | status->value.integer = (fromhex (buf[1]) << 4) + fromhex (buf[2]); | |
4f8a48e5 ILT |
594 | return 0; |
595 | } | |
596 | else if (buf[0] == 'S') | |
597 | break; | |
598 | else | |
599 | warning ("Invalid remote reply: %s", buf); | |
758aeb93 | 600 | } |
8f86a4e4 | 601 | |
94d4b713 JK |
602 | status->kind = TARGET_WAITKIND_STOPPED; |
603 | status->value.sig = (enum target_signal) | |
604 | (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); | |
8f86a4e4 | 605 | |
e1ce8aa5 | 606 | return 0; |
bd5635a1 RP |
607 | } |
608 | ||
55fea07b JK |
609 | /* Number of bytes of registers this stub implements. */ |
610 | static int register_bytes_found; | |
611 | ||
bd5635a1 | 612 | /* Read the remote registers into the block REGS. */ |
e1ce8aa5 JK |
613 | /* Currently we just read all the registers, so we don't use regno. */ |
614 | /* ARGSUSED */ | |
b543979c | 615 | static void |
bd5635a1 RP |
616 | remote_fetch_registers (regno) |
617 | int regno; | |
618 | { | |
619 | char buf[PBUFSIZ]; | |
620 | int i; | |
621 | char *p; | |
622 | char regs[REGISTER_BYTES]; | |
623 | ||
624 | sprintf (buf, "g"); | |
625 | remote_send (buf); | |
626 | ||
55fea07b JK |
627 | /* Unimplemented registers read as all bits zero. */ |
628 | memset (regs, 0, REGISTER_BYTES); | |
629 | ||
981a3309 SG |
630 | /* We can get out of synch in various cases. If the first character |
631 | in the buffer is not a hex character, assume that has happened | |
632 | and try to fetch another packet to read. */ | |
633 | while ((buf[0] < '0' || buf[0] > '9') | |
634 | && (buf[0] < 'a' || buf[0] > 'f')) | |
635 | { | |
d0d8484a | 636 | if (remote_debug) |
199b2450 | 637 | printf_unfiltered ("Bad register packet; fetching a new packet\n"); |
981a3309 SG |
638 | getpkt (buf, 0); |
639 | } | |
640 | ||
bd5635a1 RP |
641 | /* Reply describes registers byte by byte, each byte encoded as two |
642 | hex characters. Suck them all up, then supply them to the | |
643 | register cacheing/storage mechanism. */ | |
644 | ||
645 | p = buf; | |
646 | for (i = 0; i < REGISTER_BYTES; i++) | |
647 | { | |
55fea07b JK |
648 | if (p[0] == 0) |
649 | break; | |
650 | if (p[1] == 0) | |
651 | { | |
652 | warning ("Remote reply is of odd length: %s", buf); | |
653 | /* Don't change register_bytes_found in this case, and don't | |
654 | print a second warning. */ | |
655 | goto supply_them; | |
656 | } | |
bd5635a1 RP |
657 | regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); |
658 | p += 2; | |
659 | } | |
55fea07b JK |
660 | |
661 | if (i != register_bytes_found) | |
662 | { | |
663 | register_bytes_found = i; | |
664 | #ifdef REGISTER_BYTES_OK | |
665 | if (!REGISTER_BYTES_OK (i)) | |
666 | warning ("Remote reply is too short: %s", buf); | |
667 | #endif | |
668 | } | |
669 | ||
670 | supply_them: | |
bd5635a1 RP |
671 | for (i = 0; i < NUM_REGS; i++) |
672 | supply_register (i, ®s[REGISTER_BYTE(i)]); | |
bd5635a1 RP |
673 | } |
674 | ||
675 | /* Prepare to store registers. Since we send them all, we have to | |
676 | read out the ones we don't want to change first. */ | |
677 | ||
b543979c | 678 | static void |
bd5635a1 RP |
679 | remote_prepare_to_store () |
680 | { | |
34517ebc JG |
681 | /* Make sure the entire registers array is valid. */ |
682 | read_register_bytes (0, (char *)NULL, REGISTER_BYTES); | |
bd5635a1 RP |
683 | } |
684 | ||
685 | /* Store the remote registers from the contents of the block REGISTERS. | |
686 | FIXME, eventually just store one register if that's all that is needed. */ | |
687 | ||
e1ce8aa5 | 688 | /* ARGSUSED */ |
b543979c | 689 | static void |
bd5635a1 RP |
690 | remote_store_registers (regno) |
691 | int regno; | |
692 | { | |
693 | char buf[PBUFSIZ]; | |
694 | int i; | |
695 | char *p; | |
696 | ||
697 | buf[0] = 'G'; | |
698 | ||
699 | /* Command describes registers byte by byte, | |
700 | each byte encoded as two hex characters. */ | |
701 | ||
702 | p = buf + 1; | |
55fea07b JK |
703 | /* remote_prepare_to_store insures that register_bytes_found gets set. */ |
704 | for (i = 0; i < register_bytes_found; i++) | |
bd5635a1 RP |
705 | { |
706 | *p++ = tohex ((registers[i] >> 4) & 0xf); | |
707 | *p++ = tohex (registers[i] & 0xf); | |
708 | } | |
709 | *p = '\0'; | |
710 | ||
711 | remote_send (buf); | |
bd5635a1 RP |
712 | } |
713 | ||
b43e0347 JK |
714 | #if 0 |
715 | ||
716 | /* Use of the data cache is disabled because it loses for looking at | |
717 | and changing hardware I/O ports and the like. Accepting `volatile' | |
718 | would perhaps be one way to fix it, but a better way which would | |
719 | win for more cases would be to use the executable file for the text | |
720 | segment, like the `icache' code below but done cleanly (in some | |
721 | target-independent place, perhaps in target_xfer_memory, perhaps | |
722 | based on assigning each target a speed or perhaps by some simpler | |
723 | mechanism). */ | |
724 | ||
bd5635a1 RP |
725 | /* Read a word from remote address ADDR and return it. |
726 | This goes through the data cache. */ | |
727 | ||
b43e0347 | 728 | static int |
bd5635a1 RP |
729 | remote_fetch_word (addr) |
730 | CORE_ADDR addr; | |
731 | { | |
d538b510 | 732 | #if 0 |
bd5635a1 RP |
733 | if (icache) |
734 | { | |
735 | extern CORE_ADDR text_start, text_end; | |
736 | ||
737 | if (addr >= text_start && addr < text_end) | |
738 | { | |
739 | int buffer; | |
740 | xfer_core_file (addr, &buffer, sizeof (int)); | |
741 | return buffer; | |
742 | } | |
743 | } | |
d538b510 RP |
744 | #endif |
745 | return dcache_fetch (remote_dcache, addr); | |
bd5635a1 RP |
746 | } |
747 | ||
748 | /* Write a word WORD into remote address ADDR. | |
749 | This goes through the data cache. */ | |
750 | ||
b43e0347 | 751 | static void |
bd5635a1 RP |
752 | remote_store_word (addr, word) |
753 | CORE_ADDR addr; | |
754 | int word; | |
755 | { | |
d538b510 | 756 | dcache_poke (remote_dcache, addr, word); |
bd5635a1 | 757 | } |
b43e0347 | 758 | #endif /* 0 */ |
bd5635a1 RP |
759 | \f |
760 | /* Write memory data directly to the remote machine. | |
761 | This does not inform the data cache; the data cache uses this. | |
762 | MEMADDR is the address in the remote memory space. | |
763 | MYADDR is the address of the buffer in our space. | |
d538b510 | 764 | LEN is the number of bytes. |
bd5635a1 | 765 | |
d538b510 RP |
766 | Returns number of bytes transferred, or 0 for error. */ |
767 | ||
768 | static int | |
bd5635a1 RP |
769 | remote_write_bytes (memaddr, myaddr, len) |
770 | CORE_ADDR memaddr; | |
d538b510 | 771 | unsigned char *myaddr; |
bd5635a1 RP |
772 | int len; |
773 | { | |
774 | char buf[PBUFSIZ]; | |
775 | int i; | |
776 | char *p; | |
777 | ||
bd5635a1 RP |
778 | sprintf (buf, "M%x,%x:", memaddr, len); |
779 | ||
b543979c | 780 | /* We send target system values byte by byte, in increasing byte addresses, |
bd5635a1 RP |
781 | each byte encoded as two hex characters. */ |
782 | ||
783 | p = buf + strlen (buf); | |
784 | for (i = 0; i < len; i++) | |
785 | { | |
786 | *p++ = tohex ((myaddr[i] >> 4) & 0xf); | |
787 | *p++ = tohex (myaddr[i] & 0xf); | |
788 | } | |
789 | *p = '\0'; | |
790 | ||
d538b510 RP |
791 | putpkt (buf); |
792 | getpkt (buf, 0); | |
793 | ||
794 | if (buf[0] == 'E') | |
795 | { | |
796 | /* There is no correspondance between what the remote protocol uses | |
797 | for errors and errno codes. We would like a cleaner way of | |
798 | representing errors (big enough to include errno codes, bfd_error | |
799 | codes, and others). But for now just return EIO. */ | |
800 | errno = EIO; | |
801 | return 0; | |
802 | } | |
803 | return len; | |
bd5635a1 RP |
804 | } |
805 | ||
806 | /* Read memory data directly from the remote machine. | |
807 | This does not use the data cache; the data cache uses this. | |
808 | MEMADDR is the address in the remote memory space. | |
809 | MYADDR is the address of the buffer in our space. | |
d538b510 | 810 | LEN is the number of bytes. |
bd5635a1 | 811 | |
d538b510 RP |
812 | Returns number of bytes transferred, or 0 for error. */ |
813 | ||
814 | static int | |
bd5635a1 RP |
815 | remote_read_bytes (memaddr, myaddr, len) |
816 | CORE_ADDR memaddr; | |
d538b510 | 817 | unsigned char *myaddr; |
bd5635a1 RP |
818 | int len; |
819 | { | |
820 | char buf[PBUFSIZ]; | |
821 | int i; | |
822 | char *p; | |
823 | ||
824 | if (len > PBUFSIZ / 2 - 1) | |
825 | abort (); | |
826 | ||
827 | sprintf (buf, "m%x,%x", memaddr, len); | |
d538b510 RP |
828 | putpkt (buf); |
829 | getpkt (buf, 0); | |
830 | ||
831 | if (buf[0] == 'E') | |
832 | { | |
833 | /* There is no correspondance between what the remote protocol uses | |
834 | for errors and errno codes. We would like a cleaner way of | |
835 | representing errors (big enough to include errno codes, bfd_error | |
836 | codes, and others). But for now just return EIO. */ | |
837 | errno = EIO; | |
838 | return 0; | |
839 | } | |
bd5635a1 | 840 | |
b543979c | 841 | /* Reply describes memory byte by byte, |
bd5635a1 RP |
842 | each byte encoded as two hex characters. */ |
843 | ||
844 | p = buf; | |
845 | for (i = 0; i < len; i++) | |
846 | { | |
847 | if (p[0] == 0 || p[1] == 0) | |
d538b510 RP |
848 | /* Reply is short. This means that we were able to read only part |
849 | of what we wanted to. */ | |
850 | break; | |
bd5635a1 RP |
851 | myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]); |
852 | p += 2; | |
853 | } | |
d538b510 | 854 | return i; |
bd5635a1 RP |
855 | } |
856 | \f | |
857 | /* Read or write LEN bytes from inferior memory at MEMADDR, transferring | |
e1ce8aa5 | 858 | to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is |
bd5635a1 RP |
859 | nonzero. Returns length of data written or read; 0 for error. */ |
860 | ||
b543979c JG |
861 | /* ARGSUSED */ |
862 | static int | |
863 | remote_xfer_memory(memaddr, myaddr, len, should_write, target) | |
bd5635a1 RP |
864 | CORE_ADDR memaddr; |
865 | char *myaddr; | |
866 | int len; | |
e1ce8aa5 | 867 | int should_write; |
b543979c | 868 | struct target_ops *target; /* ignored */ |
bd5635a1 | 869 | { |
bd5635a1 | 870 | int xfersize; |
d538b510 RP |
871 | int bytes_xferred; |
872 | int total_xferred = 0; | |
873 | ||
bd5635a1 RP |
874 | while (len > 0) |
875 | { | |
876 | if (len > MAXBUFBYTES) | |
877 | xfersize = MAXBUFBYTES; | |
878 | else | |
879 | xfersize = len; | |
880 | ||
e1ce8aa5 | 881 | if (should_write) |
94d4b713 JK |
882 | bytes_xferred = remote_write_bytes (memaddr, |
883 | (unsigned char *)myaddr, xfersize); | |
bd5635a1 | 884 | else |
94d4b713 JK |
885 | bytes_xferred = remote_read_bytes (memaddr, |
886 | (unsigned char *)myaddr, xfersize); | |
d538b510 RP |
887 | |
888 | /* If we get an error, we are done xferring. */ | |
889 | if (bytes_xferred == 0) | |
890 | break; | |
891 | ||
892 | memaddr += bytes_xferred; | |
893 | myaddr += bytes_xferred; | |
894 | len -= bytes_xferred; | |
895 | total_xferred += bytes_xferred; | |
bd5635a1 | 896 | } |
d538b510 | 897 | return total_xferred; |
bd5635a1 RP |
898 | } |
899 | ||
94d4b713 JK |
900 | #if 0 |
901 | /* Enable after 4.12. */ | |
902 | ||
903 | void | |
904 | remote_search (len, data, mask, startaddr, increment, lorange, hirange | |
905 | addr_found, data_found) | |
906 | int len; | |
907 | char *data; | |
908 | char *mask; | |
909 | CORE_ADDR startaddr; | |
910 | int increment; | |
911 | CORE_ADDR lorange; | |
912 | CORE_ADDR hirange; | |
913 | CORE_ADDR *addr_found; | |
914 | char *data_found; | |
915 | { | |
916 | if (increment == -4 && len == 4) | |
917 | { | |
918 | long mask_long, data_long; | |
919 | long data_found_long; | |
920 | CORE_ADDR addr_we_found; | |
921 | char buf[PBUFSIZ]; | |
922 | long returned_long[2]; | |
923 | char *p; | |
924 | ||
925 | mask_long = extract_unsigned_integer (mask, len); | |
926 | data_long = extract_unsigned_integer (data, len); | |
927 | sprintf (buf, "t%x:%x,%x", startaddr, data_long, mask_long); | |
928 | putpkt (buf); | |
929 | getpkt (buf, 0); | |
930 | if (buf[0] == '\0') | |
931 | { | |
932 | /* The stub doesn't support the 't' request. We might want to | |
933 | remember this fact, but on the other hand the stub could be | |
934 | switched on us. Maybe we should remember it only until | |
935 | the next "target remote". */ | |
936 | generic_search (len, data, mask, startaddr, increment, lorange, | |
937 | hirange, addr_found, data_found); | |
938 | return; | |
939 | } | |
940 | ||
941 | if (buf[0] == 'E') | |
942 | /* There is no correspondance between what the remote protocol uses | |
943 | for errors and errno codes. We would like a cleaner way of | |
944 | representing errors (big enough to include errno codes, bfd_error | |
945 | codes, and others). But for now just use EIO. */ | |
946 | memory_error (EIO, startaddr); | |
947 | p = buf; | |
948 | addr_we_found = 0; | |
949 | while (*p != '\0' && *p != ',') | |
950 | addr_we_found = (addr_we_found << 4) + fromhex (*p++); | |
951 | if (*p == '\0') | |
952 | error ("Protocol error: short return for search"); | |
953 | ||
954 | data_found_long = 0; | |
955 | while (*p != '\0' && *p != ',') | |
956 | data_found_long = (data_found_long << 4) + fromhex (*p++); | |
957 | /* Ignore anything after this comma, for future extensions. */ | |
958 | ||
959 | if (addr_we_found < lorange || addr_we_found >= hirange) | |
960 | { | |
961 | *addr_found = 0; | |
962 | return; | |
963 | } | |
964 | ||
965 | *addr_found = addr_we_found; | |
966 | *data_found = store_unsigned_integer (data_we_found, len); | |
967 | return; | |
968 | } | |
969 | generic_search (len, data, mask, startaddr, increment, lorange, | |
970 | hirange, addr_found, data_found); | |
971 | } | |
972 | #endif /* 0 */ | |
973 | \f | |
b543979c | 974 | static void |
8f86a4e4 | 975 | remote_files_info (ignore) |
5af4f5f6 | 976 | struct target_ops *ignore; |
bd5635a1 | 977 | { |
7c622b41 | 978 | puts_filtered ("Debugging a target over a serial line.\n"); |
bd5635a1 RP |
979 | } |
980 | \f | |
e50ebec8 JK |
981 | /* Stuff for dealing with the packets which are part of this protocol. |
982 | See comment at top of file for details. */ | |
bd5635a1 | 983 | |
ebdb9ade | 984 | /* Read a single character from the remote end, masking it down to 7 bits. */ |
b543979c | 985 | |
bd5635a1 RP |
986 | static int |
987 | readchar () | |
988 | { | |
ebdb9ade | 989 | int ch; |
bd5635a1 | 990 | |
ebdb9ade | 991 | ch = SERIAL_READCHAR (remote_desc, timeout); |
fce7f2d9 | 992 | |
ebdb9ade JK |
993 | if (ch < 0) |
994 | return ch; | |
bd5635a1 | 995 | |
ebdb9ade | 996 | return ch & 0x7f; |
bd5635a1 RP |
997 | } |
998 | ||
999 | /* Send the command in BUF to the remote machine, | |
1000 | and read the reply into BUF. | |
1001 | Report an error if we get an error reply. */ | |
1002 | ||
1003 | static void | |
1004 | remote_send (buf) | |
1005 | char *buf; | |
1006 | { | |
1007 | ||
1008 | putpkt (buf); | |
7c622b41 | 1009 | getpkt (buf, 0); |
bd5635a1 RP |
1010 | |
1011 | if (buf[0] == 'E') | |
1012 | error ("Remote failure reply: %s", buf); | |
1013 | } | |
1014 | ||
1015 | /* Send a packet to the remote machine, with error checking. | |
1016 | The data of the packet is in BUF. */ | |
1017 | ||
1018 | static void | |
1019 | putpkt (buf) | |
1020 | char *buf; | |
1021 | { | |
1022 | int i; | |
1023 | unsigned char csum = 0; | |
b543979c | 1024 | char buf2[PBUFSIZ]; |
bd5635a1 | 1025 | int cnt = strlen (buf); |
ebdb9ade | 1026 | int ch; |
bd5635a1 RP |
1027 | char *p; |
1028 | ||
1029 | /* Copy the packet into buffer BUF2, encapsulating it | |
1030 | and giving it a checksum. */ | |
1031 | ||
b543979c JG |
1032 | if (cnt > sizeof(buf2) - 5) /* Prosanity check */ |
1033 | abort(); | |
1034 | ||
bd5635a1 RP |
1035 | p = buf2; |
1036 | *p++ = '$'; | |
1037 | ||
1038 | for (i = 0; i < cnt; i++) | |
1039 | { | |
1040 | csum += buf[i]; | |
1041 | *p++ = buf[i]; | |
1042 | } | |
1043 | *p++ = '#'; | |
1044 | *p++ = tohex ((csum >> 4) & 0xf); | |
1045 | *p++ = tohex (csum & 0xf); | |
1046 | ||
1047 | /* Send it over and over until we get a positive ack. */ | |
1048 | ||
6b27ebe8 JK |
1049 | while (1) |
1050 | { | |
d0d8484a | 1051 | if (remote_debug) |
6b27ebe8 JK |
1052 | { |
1053 | *p = '\0'; | |
199b2450 | 1054 | printf_unfiltered ("Sending packet: %s...", buf2); gdb_flush(gdb_stdout); |
6b27ebe8 JK |
1055 | } |
1056 | if (SERIAL_WRITE (remote_desc, buf2, p - buf2)) | |
1057 | perror_with_name ("putpkt: write failed"); | |
1058 | ||
1059 | /* read until either a timeout occurs (-2) or '+' is read */ | |
1060 | while (1) | |
1061 | { | |
1062 | ch = readchar (); | |
1063 | ||
1064 | switch (ch) | |
1065 | { | |
1066 | case '+': | |
d0d8484a | 1067 | if (remote_debug) |
199b2450 | 1068 | printf_unfiltered("Ack\n"); |
6b27ebe8 JK |
1069 | return; |
1070 | case SERIAL_TIMEOUT: | |
1071 | break; /* Retransmit buffer */ | |
1072 | case SERIAL_ERROR: | |
1073 | perror_with_name ("putpkt: couldn't read ACK"); | |
1074 | case SERIAL_EOF: | |
1075 | error ("putpkt: EOF while trying to read ACK"); | |
1076 | default: | |
d0d8484a | 1077 | if (remote_debug) |
199b2450 | 1078 | printf_unfiltered ("%02X %c ", ch&0xFF, ch); |
6b27ebe8 JK |
1079 | continue; |
1080 | } | |
1081 | break; /* Here to retransmit */ | |
1082 | } | |
981a3309 | 1083 | |
94d4b713 JK |
1084 | #if 0 |
1085 | /* This is wrong. If doing a long backtrace, the user should be | |
1086 | able to get out next time we call QUIT, without anything as violent | |
1087 | as interrupt_query. If we want to provide a way out of here | |
1088 | without getting to the next QUIT, it should be based on hitting | |
1089 | ^C twice as in remote_wait. */ | |
981a3309 SG |
1090 | if (quit_flag) |
1091 | { | |
1092 | quit_flag = 0; | |
1093 | interrupt_query (); | |
1094 | } | |
94d4b713 | 1095 | #endif |
6b27ebe8 | 1096 | } |
bd5635a1 RP |
1097 | } |
1098 | ||
1099 | /* Read a packet from the remote machine, with error checking, | |
7c622b41 JG |
1100 | and store it in BUF. BUF is expected to be of size PBUFSIZ. |
1101 | If FOREVER, wait forever rather than timing out; this is used | |
1102 | while the target is executing user code. */ | |
bd5635a1 RP |
1103 | |
1104 | static void | |
94d4b713 JK |
1105 | getpkt (retbuf, forever) |
1106 | char *retbuf; | |
ebdb9ade | 1107 | int forever; |
bd5635a1 RP |
1108 | { |
1109 | char *bp; | |
1110 | unsigned char csum; | |
7c622b41 | 1111 | int c = 0; |
bd5635a1 | 1112 | unsigned char c1, c2; |
38094c60 | 1113 | int retries = 0; |
94d4b713 JK |
1114 | char buf[PBUFSIZ]; |
1115 | ||
38094c60 | 1116 | #define MAX_RETRIES 10 |
bd5635a1 | 1117 | |
bd5635a1 RP |
1118 | while (1) |
1119 | { | |
94d4b713 JK |
1120 | #if 0 |
1121 | /* This is wrong. If doing a long backtrace, the user should be | |
1122 | able to get out time next we call QUIT, without anything as violent | |
1123 | as interrupt_query. If we want to provide a way out of here | |
1124 | without getting to the next QUIT, it should be based on hitting | |
1125 | ^C twice as in remote_wait. */ | |
981a3309 SG |
1126 | if (quit_flag) |
1127 | { | |
1128 | quit_flag = 0; | |
1129 | interrupt_query (); | |
1130 | } | |
94d4b713 | 1131 | #endif |
981a3309 | 1132 | |
7c622b41 JG |
1133 | /* This can loop forever if the remote side sends us characters |
1134 | continuously, but if it pauses, we'll get a zero from readchar | |
1135 | because of timeout. Then we'll count that as a retry. */ | |
6b27ebe8 JK |
1136 | |
1137 | c = readchar(); | |
1138 | if (c > 0 && c != '$') | |
1139 | continue; | |
1140 | ||
1141 | if (c == SERIAL_TIMEOUT) | |
1142 | { | |
1143 | if (forever) | |
1144 | continue; | |
1145 | if (++retries >= MAX_RETRIES) | |
d0d8484a | 1146 | if (remote_debug) puts_filtered ("Timed out.\n"); |
6b27ebe8 JK |
1147 | goto out; |
1148 | } | |
1149 | ||
1150 | if (c == SERIAL_EOF) | |
1151 | error ("Remote connection closed"); | |
1152 | if (c == SERIAL_ERROR) | |
1153 | perror_with_name ("Remote communication error"); | |
7c622b41 | 1154 | |
bd5635a1 RP |
1155 | /* Force csum to be zero here because of possible error retry. */ |
1156 | csum = 0; | |
bd5635a1 | 1157 | bp = buf; |
7c622b41 | 1158 | |
bd5635a1 RP |
1159 | while (1) |
1160 | { | |
1161 | c = readchar (); | |
ebdb9ade | 1162 | if (c == SERIAL_TIMEOUT) |
7c622b41 | 1163 | { |
d0d8484a | 1164 | if (remote_debug) |
7c622b41 JG |
1165 | puts_filtered ("Timeout in mid-packet, retrying\n"); |
1166 | goto whole; /* Start a new packet, count retries */ | |
1167 | } | |
1168 | if (c == '$') | |
1169 | { | |
d0d8484a | 1170 | if (remote_debug) |
7c622b41 JG |
1171 | puts_filtered ("Saw new packet start in middle of old one\n"); |
1172 | goto whole; /* Start a new packet, count retries */ | |
1173 | } | |
bd5635a1 RP |
1174 | if (c == '#') |
1175 | break; | |
8f86a4e4 JG |
1176 | if (bp >= buf+PBUFSIZ-1) |
1177 | { | |
1178 | *bp = '\0'; | |
7c622b41 JG |
1179 | puts_filtered ("Remote packet too long: "); |
1180 | puts_filtered (buf); | |
1181 | puts_filtered ("\n"); | |
8f86a4e4 JG |
1182 | goto whole; |
1183 | } | |
bd5635a1 RP |
1184 | *bp++ = c; |
1185 | csum += c; | |
1186 | } | |
1187 | *bp = 0; | |
1188 | ||
1189 | c1 = fromhex (readchar ()); | |
1190 | c2 = fromhex (readchar ()); | |
1191 | if ((csum & 0xff) == (c1 << 4) + c2) | |
1192 | break; | |
7c622b41 JG |
1193 | printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=", |
1194 | (c1 << 4) + c2, csum & 0xff); | |
1195 | puts_filtered (buf); | |
1196 | puts_filtered ("\n"); | |
38094c60 | 1197 | |
8f86a4e4 JG |
1198 | /* Try the whole thing again. */ |
1199 | whole: | |
38094c60 JG |
1200 | if (++retries < MAX_RETRIES) |
1201 | { | |
ebdb9ade | 1202 | SERIAL_WRITE (remote_desc, "-", 1); |
38094c60 JG |
1203 | } |
1204 | else | |
1205 | { | |
199b2450 | 1206 | printf_unfiltered ("Ignoring packet error, continuing...\n"); |
38094c60 JG |
1207 | break; |
1208 | } | |
bd5635a1 RP |
1209 | } |
1210 | ||
94d4b713 JK |
1211 | /* Deal with run-length encoding. */ |
1212 | { | |
1213 | char *src = buf; | |
1214 | char *dest = retbuf; | |
1215 | int i; | |
1216 | int repeat; | |
1217 | do { | |
1218 | if (*src == '*') | |
1219 | { | |
1220 | if (src[1] == '\0' || src[2] == '\0') | |
1221 | { | |
1222 | if (remote_debug) | |
1223 | puts_filtered ("Packet too short, retrying\n"); | |
1224 | goto whole; | |
1225 | } | |
1226 | repeat = (fromhex (src[1]) << 4) + fromhex (src[2]); | |
1227 | for (i = 0; i < repeat; ++i) | |
1228 | { | |
1229 | *dest++ = src[-1]; | |
1230 | } | |
1231 | src += 2; | |
1232 | } | |
1233 | else | |
1234 | { | |
1235 | *dest++ = *src; | |
1236 | } | |
1237 | } while (*src++ != '\0'); | |
1238 | } | |
7c622b41 | 1239 | |
94d4b713 | 1240 | out: |
ebdb9ade | 1241 | SERIAL_WRITE (remote_desc, "+", 1); |
bd5635a1 | 1242 | |
d0d8484a | 1243 | if (remote_debug) |
199b2450 | 1244 | fprintf_unfiltered (gdb_stderr,"Packet received: %s\n", buf); |
bd5635a1 RP |
1245 | } |
1246 | \f | |
ebdb9ade JK |
1247 | static void |
1248 | remote_kill () | |
1249 | { | |
1250 | putpkt ("k"); | |
1251 | /* Don't wait for it to die. I'm not really sure it matters whether | |
1252 | we do or not. For the existing stubs, kill is a noop. */ | |
1253 | target_mourn_inferior (); | |
1254 | } | |
bd5635a1 | 1255 | |
ebdb9ade JK |
1256 | static void |
1257 | remote_mourn () | |
1258 | { | |
1259 | unpush_target (&remote_ops); | |
1260 | generic_mourn_inferior (); | |
1261 | } | |
1262 | \f | |
5af4f5f6 JK |
1263 | #ifdef REMOTE_BREAKPOINT |
1264 | ||
1265 | /* On some machines, e.g. 68k, we may use a different breakpoint instruction | |
1266 | than other targets. */ | |
1267 | static unsigned char break_insn[] = REMOTE_BREAKPOINT; | |
1268 | ||
1269 | /* Check that it fits in BREAKPOINT_MAX bytes. */ | |
1270 | static unsigned char check_break_insn_size[BREAKPOINT_MAX] = REMOTE_BREAKPOINT; | |
1271 | ||
1272 | #else /* No REMOTE_BREAKPOINT. */ | |
1273 | ||
1274 | /* Same old breakpoint instruction. This code does nothing different | |
1275 | than mem-break.c. */ | |
1276 | static unsigned char break_insn[] = BREAKPOINT; | |
1277 | ||
1278 | #endif /* No REMOTE_BREAKPOINT. */ | |
1279 | ||
1280 | /* Insert a breakpoint on targets that don't have any better breakpoint | |
1281 | support. We read the contents of the target location and stash it, | |
1282 | then overwrite it with a breakpoint instruction. ADDR is the target | |
1283 | location in the target machine. CONTENTS_CACHE is a pointer to | |
1284 | memory allocated for saving the target contents. It is guaranteed | |
1285 | by the caller to be long enough to save sizeof BREAKPOINT bytes (this | |
1286 | is accomplished via BREAKPOINT_MAX). */ | |
1287 | ||
d538b510 | 1288 | static int |
5af4f5f6 JK |
1289 | remote_insert_breakpoint (addr, contents_cache) |
1290 | CORE_ADDR addr; | |
1291 | char *contents_cache; | |
1292 | { | |
1293 | int val; | |
1294 | ||
1295 | val = target_read_memory (addr, contents_cache, sizeof break_insn); | |
1296 | ||
1297 | if (val == 0) | |
1298 | val = target_write_memory (addr, (char *)break_insn, sizeof break_insn); | |
1299 | ||
1300 | return val; | |
1301 | } | |
1302 | ||
d538b510 | 1303 | static int |
5af4f5f6 JK |
1304 | remote_remove_breakpoint (addr, contents_cache) |
1305 | CORE_ADDR addr; | |
1306 | char *contents_cache; | |
1307 | { | |
1308 | return target_write_memory (addr, contents_cache, sizeof break_insn); | |
1309 | } | |
1310 | \f | |
bd5635a1 RP |
1311 | /* Define the target subroutine names */ |
1312 | ||
1313 | struct target_ops remote_ops = { | |
b543979c JG |
1314 | "remote", /* to_shortname */ |
1315 | "Remote serial target in gdb-specific protocol", /* to_longname */ | |
1316 | "Use a remote computer via a serial line, using a gdb-specific protocol.\n\ | |
1317 | Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */ | |
1318 | remote_open, /* to_open */ | |
1319 | remote_close, /* to_close */ | |
1320 | NULL, /* to_attach */ | |
1321 | remote_detach, /* to_detach */ | |
1322 | remote_resume, /* to_resume */ | |
1323 | remote_wait, /* to_wait */ | |
1324 | remote_fetch_registers, /* to_fetch_registers */ | |
1325 | remote_store_registers, /* to_store_registers */ | |
1326 | remote_prepare_to_store, /* to_prepare_to_store */ | |
b543979c JG |
1327 | remote_xfer_memory, /* to_xfer_memory */ |
1328 | remote_files_info, /* to_files_info */ | |
5af4f5f6 JK |
1329 | |
1330 | remote_insert_breakpoint, /* to_insert_breakpoint */ | |
1331 | remote_remove_breakpoint, /* to_remove_breakpoint */ | |
1332 | ||
b543979c JG |
1333 | NULL, /* to_terminal_init */ |
1334 | NULL, /* to_terminal_inferior */ | |
1335 | NULL, /* to_terminal_ours_for_output */ | |
1336 | NULL, /* to_terminal_ours */ | |
1337 | NULL, /* to_terminal_info */ | |
ebdb9ade | 1338 | remote_kill, /* to_kill */ |
6b27ebe8 | 1339 | generic_load, /* to_load */ |
b543979c JG |
1340 | NULL, /* to_lookup_symbol */ |
1341 | NULL, /* to_create_inferior */ | |
ebdb9ade | 1342 | remote_mourn, /* to_mourn_inferior */ |
34517ebc | 1343 | 0, /* to_can_run */ |
7c622b41 | 1344 | 0, /* to_notice_signals */ |
b543979c JG |
1345 | process_stratum, /* to_stratum */ |
1346 | NULL, /* to_next */ | |
1347 | 1, /* to_has_all_memory */ | |
1348 | 1, /* to_has_memory */ | |
1349 | 1, /* to_has_stack */ | |
1350 | 1, /* to_has_registers */ | |
1351 | 1, /* to_has_execution */ | |
1352 | NULL, /* sections */ | |
1353 | NULL, /* sections_end */ | |
1354 | OPS_MAGIC /* to_magic */ | |
bd5635a1 | 1355 | }; |
976bb0be | 1356 | #endif /* Use remote. */ |
bd5635a1 RP |
1357 | |
1358 | void | |
1359 | _initialize_remote () | |
1360 | { | |
976bb0be | 1361 | #if !defined(DONT_USE_REMOTE) |
bd5635a1 | 1362 | add_target (&remote_ops); |
8f86a4e4 | 1363 | #endif |
976bb0be | 1364 | } |