Commit | Line | Data |
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b543979c | 1 | /* Remote target communications for serial-line targets in custom GDB protocol |
0d14c7df | 2 | Copyright 1988, 1991, 1992, 1993, 1994, 1995, 1996 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 | 17 | along with this program; if not, write to the Free Software |
998cfe7d | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 | |
0c993550 JK |
28 | '$' or '#'. If <data> starts with two characters followed by |
29 | ':', then the existing stubs interpret this as a sequence number. | |
e50ebec8 JK |
30 | |
31 | CSUM1 and CSUM2 are ascii hex representation of an 8-bit | |
32 | checksum of <data>, the most significant nibble is sent first. | |
33 | the hex digits 0-9,a-f are used. | |
34 | ||
35 | Receiver responds with: | |
36 | ||
37 | + - if CSUM is correct and ready for next packet | |
38 | - - if CSUM is incorrect | |
39 | ||
40 | <data> is as follows: | |
4cc1b3f7 JK |
41 | Most values are encoded in ascii hex digits. Signal numbers are according |
42 | to the numbering in target.h. | |
bd5635a1 RP |
43 | |
44 | Request Packet | |
45 | ||
4cc1b3f7 JK |
46 | set thread Hct... Set thread for subsequent operations. |
47 | c = 'c' for thread used in step and | |
48 | continue; t... can be -1 for all | |
49 | threads. | |
50 | c = 'g' for thread used in other | |
51 | operations. If zero, pick a thread, | |
52 | any thread. | |
53 | reply OK for success | |
54 | ENN for an error. | |
55 | ||
bd5635a1 RP |
56 | read registers g |
57 | reply XX....X Each byte of register data | |
58 | is described by two hex digits. | |
59 | Registers are in the internal order | |
60 | for GDB, and the bytes in a register | |
61 | are in the same order the machine uses. | |
62 | or ENN for an error. | |
63 | ||
64 | write regs GXX..XX Each byte of register data | |
65 | is described by two hex digits. | |
66 | reply OK for success | |
67 | ENN for an error | |
68 | ||
0c993550 | 69 | write reg Pn...=r... Write register n... with value r..., |
4aa6fe10 JK |
70 | which contains two hex digits for each |
71 | byte in the register (target byte | |
72 | order). | |
73 | reply OK for success | |
74 | ENN for an error | |
75 | (not supported by all stubs). | |
76 | ||
bd5635a1 RP |
77 | read mem mAA..AA,LLLL AA..AA is address, LLLL is length. |
78 | reply XX..XX XX..XX is mem contents | |
d538b510 RP |
79 | Can be fewer bytes than requested |
80 | if able to read only part of the data. | |
bd5635a1 RP |
81 | or ENN NN is errno |
82 | ||
83 | write mem MAA..AA,LLLL:XX..XX | |
84 | AA..AA is address, | |
85 | LLLL is number of bytes, | |
86 | XX..XX is data | |
87 | reply OK for success | |
d538b510 RP |
88 | ENN for an error (this includes the case |
89 | where only part of the data was | |
90 | written). | |
bd5635a1 | 91 | |
4cc1b3f7 | 92 | continue cAA..AA AA..AA is address to resume |
bd5635a1 RP |
93 | If AA..AA is omitted, |
94 | resume at same address. | |
95 | ||
96 | step sAA..AA AA..AA is address to resume | |
97 | If AA..AA is omitted, | |
98 | resume at same address. | |
99 | ||
4cc1b3f7 JK |
100 | continue with Csig;AA Continue with signal sig (hex signal |
101 | signal number). | |
102 | ||
103 | step with Ssig;AA Like 'C' but step not continue. | |
104 | signal | |
105 | ||
bd5635a1 RP |
106 | last signal ? Reply the current reason for stopping. |
107 | This is the same reply as is generated | |
108 | for step or cont : SAA where AA is the | |
109 | signal number. | |
110 | ||
b52cac6b FF |
111 | detach D Reply OK. |
112 | ||
bd5635a1 RP |
113 | There is no immediate reply to step or cont. |
114 | The reply comes when the machine stops. | |
4cc1b3f7 | 115 | It is SAA AA is the signal number. |
bd5635a1 | 116 | |
4cc1b3f7 | 117 | or... TAAn...:r...;n...:r...;n...:r...; |
e50ebec8 | 118 | AA = signal number |
4cc1b3f7 JK |
119 | n... = register number (hex) |
120 | r... = register contents | |
121 | n... = `thread' | |
122 | r... = thread process ID. This is | |
123 | a hex integer. | |
124 | n... = other string not starting | |
125 | with valid hex digit. | |
126 | gdb should ignore this n,r pair | |
127 | and go on to the next. This way | |
128 | we can extend the protocol. | |
72bba93b | 129 | or... WAA The process exited, and AA is |
758aeb93 ILT |
130 | the exit status. This is only |
131 | applicable for certains sorts of | |
132 | targets. | |
4cc1b3f7 JK |
133 | or... XAA The process terminated with signal |
134 | AA. | |
998cfe7d SC |
135 | or... OXX..XX XX..XX is hex encoding of ASCII data. This |
136 | can happen at any time while the program is | |
4cc1b3f7 JK |
137 | running and the debugger should |
138 | continue to wait for 'W', 'T', etc. | |
139 | ||
2b576293 C |
140 | thread alive TXX Find out if the thread XX is alive. |
141 | reply OK thread is still alive | |
142 | ENN thread is dead | |
143 | ||
144 | remote restart RXX Restart the remote server | |
145 | ||
146 | extended ops ! Use the extended remote protocol. | |
147 | Sticky -- only needs to be set once. | |
148 | ||
d538b510 RP |
149 | kill request k |
150 | ||
151 | toggle debug d toggle debug flag (see 386 & 68k stubs) | |
152 | reset r reset -- see sparc stub. | |
153 | reserved <other> On other requests, the stub should | |
154 | ignore the request and send an empty | |
155 | response ($#<checksum>). This way | |
156 | we can extend the protocol and GDB | |
157 | can tell whether the stub it is | |
158 | talking to uses the old or the new. | |
72bba93b | 159 | search tAA:PP,MM Search backwards starting at address |
94d4b713 JK |
160 | AA for a match with pattern PP and |
161 | mask MM. PP and MM are 4 bytes. | |
162 | Not supported by all stubs. | |
163 | ||
72bba93b SG |
164 | general query qXXXX Request info about XXXX. |
165 | general set QXXXX=yyyy Set value of XXXX to yyyy. | |
166 | query sect offs qOffsets Get section offsets. Reply is | |
167 | Text=xxx;Data=yyy;Bss=zzz | |
72bba93b | 168 | |
94d4b713 | 169 | Responses can be run-length encoded to save space. A '*' means that |
284f4ee9 | 170 | the next character is an ASCII encoding giving a repeat count which |
94d4b713 | 171 | stands for that many repititions of the character preceding the '*'. |
284f4ee9 SC |
172 | The encoding is n+29, yielding a printable character where n >=3 |
173 | (which is where rle starts to win). Don't use an n > 126. | |
174 | ||
175 | So | |
176 | "0* " means the same as "0000". */ | |
bd5635a1 | 177 | |
d747e0af | 178 | #include "defs.h" |
2b576293 | 179 | #include "gdb_string.h" |
bd5635a1 | 180 | #include <fcntl.h> |
bd5635a1 RP |
181 | #include "frame.h" |
182 | #include "inferior.h" | |
e50ebec8 | 183 | #include "bfd.h" |
6b27ebe8 | 184 | #include "symfile.h" |
bd5635a1 RP |
185 | #include "target.h" |
186 | #include "wait.h" | |
0d14c7df | 187 | /*#include "terminal.h"*/ |
8f86a4e4 | 188 | #include "gdbcmd.h" |
758aeb93 ILT |
189 | #include "objfiles.h" |
190 | #include "gdb-stabs.h" | |
cb1709ae | 191 | #include "gdbthread.h" |
bd5635a1 | 192 | |
d538b510 RP |
193 | #include "dcache.h" |
194 | ||
bd5635a1 RP |
195 | #ifdef USG |
196 | #include <sys/types.h> | |
197 | #endif | |
198 | ||
199 | #include <signal.h> | |
ebdb9ade | 200 | #include "serial.h" |
bd5635a1 | 201 | |
b543979c JG |
202 | /* Prototypes for local functions */ |
203 | ||
45993f61 | 204 | static int remote_write_bytes PARAMS ((CORE_ADDR memaddr, |
43fc25c8 | 205 | char *myaddr, int len)); |
b543979c | 206 | |
45993f61 | 207 | static int remote_read_bytes PARAMS ((CORE_ADDR memaddr, |
43fc25c8 | 208 | char *myaddr, int len)); |
b543979c | 209 | |
45993f61 | 210 | static void remote_files_info PARAMS ((struct target_ops *ignore)); |
b543979c | 211 | |
45993f61 SC |
212 | static int remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, |
213 | int len, int should_write, | |
214 | struct target_ops *target)); | |
b543979c | 215 | |
45993f61 | 216 | static void remote_prepare_to_store PARAMS ((void)); |
b543979c | 217 | |
45993f61 | 218 | static void remote_fetch_registers PARAMS ((int regno)); |
b543979c | 219 | |
45993f61 SC |
220 | static void remote_resume PARAMS ((int pid, int step, |
221 | enum target_signal siggnal)); | |
b543979c | 222 | |
45993f61 | 223 | static int remote_start_remote PARAMS ((char *dummy)); |
7c622b41 | 224 | |
45993f61 | 225 | static void remote_open PARAMS ((char *name, int from_tty)); |
b543979c | 226 | |
2b576293 C |
227 | static void extended_remote_open PARAMS ((char *name, int from_tty)); |
228 | ||
229 | static void remote_open_1 PARAMS ((char *, int, struct target_ops *)); | |
230 | ||
45993f61 | 231 | static void remote_close PARAMS ((int quitting)); |
b543979c | 232 | |
45993f61 | 233 | static void remote_store_registers PARAMS ((int regno)); |
b543979c | 234 | |
2b576293 C |
235 | static void remote_mourn PARAMS ((void)); |
236 | ||
237 | static void extended_remote_restart PARAMS ((void)); | |
238 | ||
239 | static void extended_remote_mourn PARAMS ((void)); | |
240 | ||
241 | static void extended_remote_create_inferior PARAMS ((char *, char *, char **)); | |
242 | ||
243 | static void remote_mourn_1 PARAMS ((struct target_ops *)); | |
244 | ||
45993f61 | 245 | static void getpkt PARAMS ((char *buf, int forever)); |
b543979c | 246 | |
45993f61 | 247 | static int putpkt PARAMS ((char *buf)); |
b543979c | 248 | |
45993f61 | 249 | static void remote_send PARAMS ((char *buf)); |
b543979c | 250 | |
45993f61 | 251 | static int readchar PARAMS ((int timeout)); |
b543979c | 252 | |
94d4b713 | 253 | static int remote_wait PARAMS ((int pid, struct target_waitstatus *status)); |
b543979c | 254 | |
45993f61 | 255 | static void remote_kill PARAMS ((void)); |
b543979c | 256 | |
45993f61 | 257 | static int tohex PARAMS ((int nib)); |
b543979c | 258 | |
45993f61 | 259 | static int fromhex PARAMS ((int a)); |
5af4f5f6 | 260 | |
45993f61 | 261 | static void remote_detach PARAMS ((char *args, int from_tty)); |
5af4f5f6 | 262 | |
45993f61 | 263 | static void remote_interrupt PARAMS ((int signo)); |
b543979c | 264 | |
45993f61 SC |
265 | static void remote_interrupt_twice PARAMS ((int signo)); |
266 | ||
267 | static void interrupt_query PARAMS ((void)); | |
981a3309 | 268 | |
bd5635a1 | 269 | extern struct target_ops remote_ops; /* Forward decl */ |
2b576293 | 270 | extern struct target_ops extended_remote_ops; /* Forward decl */ |
bd5635a1 | 271 | |
ebdb9ade JK |
272 | /* This was 5 seconds, which is a long time to sit and wait. |
273 | Unless this is going though some terminal server or multiplexer or | |
274 | other form of hairy serial connection, I would think 2 seconds would | |
275 | be plenty. */ | |
bd5635a1 | 276 | |
cb1709ae DP |
277 | /* Changed to allow option to set timeout value. |
278 | was static int remote_timeout = 2; */ | |
279 | extern int remote_timeout; | |
bd5635a1 | 280 | |
b52cac6b FF |
281 | /* This variable chooses whether to send a ^C or a break when the user |
282 | requests program interruption. Although ^C is usually what remote | |
283 | systems expect, and that is the default here, sometimes a break is | |
284 | preferable instead. */ | |
285 | ||
286 | static int remote_break; | |
287 | ||
16e1d1d3 | 288 | /* Descriptor for I/O to remote machine. Initialize it to NULL so that |
bd5635a1 RP |
289 | remote_open knows that we don't have a file open when the program |
290 | starts. */ | |
ebdb9ade | 291 | serial_t remote_desc = NULL; |
bd5635a1 | 292 | |
4d57c599 JK |
293 | /* Having this larger than 400 causes us to be incompatible with m68k-stub.c |
294 | and i386-stub.c. Normally, no one would notice because it only matters | |
295 | for writing large chunks of memory (e.g. in downloads). Also, this needs | |
296 | to be more than 400 if required to hold the registers (see below, where | |
297 | we round it up based on REGISTER_BYTES). */ | |
298 | #define PBUFSIZ 400 | |
bd5635a1 RP |
299 | |
300 | /* Maximum number of bytes to read/write at once. The value here | |
301 | is chosen to fill up a packet (the headers account for the 32). */ | |
302 | #define MAXBUFBYTES ((PBUFSIZ-32)/2) | |
303 | ||
b543979c | 304 | /* Round up PBUFSIZ to hold all the registers, at least. */ |
2ddeed27 JK |
305 | /* The blank line after the #if seems to be required to work around a |
306 | bug in HP's PA compiler. */ | |
b543979c | 307 | #if REGISTER_BYTES > MAXBUFBYTES |
2ddeed27 JK |
308 | |
309 | #undef PBUFSIZ | |
b543979c | 310 | #define PBUFSIZ (REGISTER_BYTES * 2 + 32) |
bd5635a1 | 311 | #endif |
4aa6fe10 | 312 | |
fea17b55 SS |
313 | /* This variable sets the number of bytes to be written to the target |
314 | in a single packet. Normally PBUFSIZ is satisfactory, but some | |
315 | targets need smaller values (perhaps because the receiving end | |
316 | is slow). */ | |
317 | ||
318 | static int remote_write_size = PBUFSIZ; | |
319 | ||
4aa6fe10 JK |
320 | /* Should we try the 'P' request? If this is set to one when the stub |
321 | doesn't support 'P', the only consequence is some unnecessary traffic. */ | |
322 | static int stub_supports_P = 1; | |
323 | ||
4cc1b3f7 JK |
324 | \f |
325 | /* These are the threads which we last sent to the remote system. -1 for all | |
326 | or -2 for not sent yet. */ | |
327 | int general_thread; | |
328 | int cont_thread; | |
329 | ||
330 | static void | |
331 | set_thread (th, gen) | |
332 | int th; | |
333 | int gen; | |
334 | { | |
335 | char buf[PBUFSIZ]; | |
336 | int state = gen ? general_thread : cont_thread; | |
337 | if (state == th) | |
338 | return; | |
339 | buf[0] = 'H'; | |
340 | buf[1] = gen ? 'g' : 'c'; | |
341 | if (th == 42000) | |
342 | { | |
343 | buf[2] = '0'; | |
344 | buf[3] = '\0'; | |
345 | } | |
346 | else if (th < 0) | |
347 | sprintf (&buf[2], "-%x", -th); | |
348 | else | |
349 | sprintf (&buf[2], "%x", th); | |
350 | putpkt (buf); | |
351 | getpkt (buf, 0); | |
352 | if (gen) | |
353 | general_thread = th; | |
354 | else | |
355 | cont_thread = th; | |
356 | } | |
bd5635a1 | 357 | \f |
2b576293 | 358 | /* Return nonzero if the thread TH is still alive on the remote system. */ |
43fc25c8 JL |
359 | |
360 | static int | |
361 | remote_thread_alive (th) | |
362 | int th; | |
363 | { | |
364 | char buf[PBUFSIZ]; | |
365 | ||
366 | buf[0] = 'T'; | |
367 | if (th < 0) | |
368 | sprintf (&buf[1], "-%x", -th); | |
369 | else | |
370 | sprintf (&buf[1], "%x", th); | |
371 | putpkt (buf); | |
372 | getpkt (buf, 0); | |
373 | return (buf[0] == 'O' && buf[1] == 'K'); | |
374 | } | |
2b576293 C |
375 | |
376 | /* Restart the remote side; this is an extended protocol operation. */ | |
377 | ||
378 | static void | |
379 | extended_remote_restart () | |
380 | { | |
381 | char buf[PBUFSIZ]; | |
382 | ||
383 | /* Send the restart command; for reasons I don't understand the | |
384 | remote side really expects a number after the "R". */ | |
385 | buf[0] = 'R'; | |
386 | sprintf (&buf[1], "%x", 0); | |
387 | putpkt (buf); | |
388 | ||
389 | /* Now query for status so this looks just like we restarted | |
390 | gdbserver from scratch. */ | |
391 | putpkt ("?"); | |
392 | getpkt (buf, 0); | |
393 | } | |
43fc25c8 | 394 | \f |
bd5635a1 RP |
395 | /* Clean up connection to a remote debugger. */ |
396 | ||
e1ce8aa5 | 397 | /* ARGSUSED */ |
b543979c | 398 | static void |
bd5635a1 RP |
399 | remote_close (quitting) |
400 | int quitting; | |
401 | { | |
ebdb9ade JK |
402 | if (remote_desc) |
403 | SERIAL_CLOSE (remote_desc); | |
404 | remote_desc = NULL; | |
b543979c JG |
405 | } |
406 | ||
72bba93b SG |
407 | /* Query the remote side for the text, data and bss offsets. */ |
408 | ||
409 | static void | |
410 | get_offsets () | |
411 | { | |
6c27841f | 412 | char buf[PBUFSIZ]; |
72bba93b SG |
413 | int nvals; |
414 | CORE_ADDR text_addr, data_addr, bss_addr; | |
415 | struct section_offsets *offs; | |
416 | ||
417 | putpkt ("qOffsets"); | |
418 | ||
1c95d7ab | 419 | getpkt (buf, 0); |
72bba93b | 420 | |
1c95d7ab JK |
421 | if (buf[0] == '\000') |
422 | return; /* Return silently. Stub doesn't support this | |
423 | command. */ | |
72bba93b SG |
424 | if (buf[0] == 'E') |
425 | { | |
426 | warning ("Remote failure reply: %s", buf); | |
427 | return; | |
428 | } | |
429 | ||
430 | nvals = sscanf (buf, "Text=%lx;Data=%lx;Bss=%lx", &text_addr, &data_addr, | |
431 | &bss_addr); | |
432 | if (nvals != 3) | |
433 | error ("Malformed response to offset query, %s", buf); | |
434 | ||
435 | if (symfile_objfile == NULL) | |
436 | return; | |
437 | ||
438 | offs = (struct section_offsets *) alloca (sizeof (struct section_offsets) | |
439 | + symfile_objfile->num_sections | |
440 | * sizeof (offs->offsets)); | |
441 | memcpy (offs, symfile_objfile->section_offsets, | |
442 | sizeof (struct section_offsets) | |
443 | + symfile_objfile->num_sections | |
444 | * sizeof (offs->offsets)); | |
445 | ||
446 | ANOFFSET (offs, SECT_OFF_TEXT) = text_addr; | |
1624c38f SG |
447 | |
448 | /* This is a temporary kludge to force data and bss to use the same offsets | |
449 | because that's what nlmconv does now. The real solution requires changes | |
450 | to the stub and remote.c that I don't have time to do right now. */ | |
451 | ||
72bba93b | 452 | ANOFFSET (offs, SECT_OFF_DATA) = data_addr; |
1624c38f | 453 | ANOFFSET (offs, SECT_OFF_BSS) = data_addr; |
72bba93b SG |
454 | |
455 | objfile_relocate (symfile_objfile, offs); | |
456 | } | |
457 | ||
7c622b41 JG |
458 | /* Stub for catch_errors. */ |
459 | ||
460 | static int | |
461 | remote_start_remote (dummy) | |
462 | char *dummy; | |
463 | { | |
ac7a377f JK |
464 | immediate_quit = 1; /* Allow user to interrupt it */ |
465 | ||
7c622b41 | 466 | /* Ack any packet which the remote side has already sent. */ |
72bba93b SG |
467 | SERIAL_WRITE (remote_desc, "+", 1); |
468 | ||
4cc1b3f7 JK |
469 | /* Let the stub know that we want it to return the thread. */ |
470 | set_thread (-1, 0); | |
471 | ||
72bba93b SG |
472 | get_offsets (); /* Get text, data & bss offsets */ |
473 | ||
7c622b41 | 474 | putpkt ("?"); /* initiate a query from remote machine */ |
ac7a377f | 475 | immediate_quit = 0; |
7c622b41 JG |
476 | |
477 | start_remote (); /* Initialize gdb process mechanisms */ | |
478 | return 1; | |
479 | } | |
480 | ||
bd5635a1 RP |
481 | /* Open a connection to a remote debugger. |
482 | NAME is the filename used for communication. */ | |
483 | ||
2b576293 C |
484 | static void |
485 | remote_open (name, from_tty) | |
486 | char *name; | |
487 | int from_tty; | |
488 | { | |
489 | remote_open_1 (name, from_tty, &remote_ops); | |
490 | } | |
491 | ||
492 | /* Open a connection to a remote debugger using the extended | |
935e77f5 | 493 | remote gdb protocol. NAME is the filename used for communication. */ |
2b576293 C |
494 | |
495 | static void | |
496 | extended_remote_open (name, from_tty) | |
497 | char *name; | |
498 | int from_tty; | |
499 | { | |
500 | char buf[PBUFSIZ]; | |
501 | ||
502 | /* Do the basic remote open stuff. */ | |
503 | remote_open_1 (name, from_tty, &extended_remote_ops); | |
504 | ||
505 | /* Now tell the remote that we're using the extended protocol. */ | |
506 | putpkt ("!"); | |
507 | getpkt (buf, 0); | |
508 | ||
509 | } | |
510 | ||
511 | /* Generic code for opening a connection to a remote target. */ | |
d538b510 RP |
512 | static DCACHE *remote_dcache; |
513 | ||
b543979c | 514 | static void |
2b576293 | 515 | remote_open_1 (name, from_tty, target) |
bd5635a1 RP |
516 | char *name; |
517 | int from_tty; | |
2b576293 | 518 | struct target_ops *target; |
bd5635a1 | 519 | { |
bd5635a1 | 520 | if (name == 0) |
45993f61 | 521 | error ("To open a remote debug connection, you need to specify what serial\n\ |
bd5635a1 RP |
522 | device is attached to the remote system (e.g. /dev/ttya)."); |
523 | ||
f2fc6e7a JK |
524 | target_preopen (from_tty); |
525 | ||
2b576293 | 526 | unpush_target (target); |
bd5635a1 | 527 | |
d538b510 | 528 | remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes); |
bd5635a1 | 529 | |
ebdb9ade JK |
530 | remote_desc = SERIAL_OPEN (name); |
531 | if (!remote_desc) | |
bd5635a1 RP |
532 | perror_with_name (name); |
533 | ||
94d4b713 | 534 | if (baud_rate != -1) |
b543979c | 535 | { |
94d4b713 JK |
536 | if (SERIAL_SETBAUDRATE (remote_desc, baud_rate)) |
537 | { | |
538 | SERIAL_CLOSE (remote_desc); | |
539 | perror_with_name (name); | |
540 | } | |
b543979c | 541 | } |
ebdb9ade | 542 | |
45993f61 | 543 | |
ebdb9ade | 544 | SERIAL_RAW (remote_desc); |
bd5635a1 | 545 | |
e15f2a54 JK |
546 | /* If there is something sitting in the buffer we might take it as a |
547 | response to a command, which would be bad. */ | |
548 | SERIAL_FLUSH_INPUT (remote_desc); | |
549 | ||
bd5635a1 | 550 | if (from_tty) |
7c622b41 JG |
551 | { |
552 | puts_filtered ("Remote debugging using "); | |
553 | puts_filtered (name); | |
554 | puts_filtered ("\n"); | |
555 | } | |
2b576293 | 556 | push_target (target); /* Switch to using remote target now */ |
bd5635a1 | 557 | |
4aa6fe10 JK |
558 | /* Start out by trying the 'P' request to set registers. We set this each |
559 | time that we open a new target so that if the user switches from one | |
560 | stub to another, we can (if the target is closed and reopened) cope. */ | |
561 | stub_supports_P = 1; | |
562 | ||
4cc1b3f7 JK |
563 | general_thread = -2; |
564 | cont_thread = -2; | |
565 | ||
a1e0ba7a SG |
566 | /* Without this, some commands which require an active target (such as kill) |
567 | won't work. This variable serves (at least) double duty as both the pid | |
568 | of the target process (if it has such), and as a flag indicating that a | |
569 | target is active. These functions should be split out into seperate | |
570 | variables, especially since GDB will someday have a notion of debugging | |
571 | several processes. */ | |
572 | ||
4fb7359d | 573 | inferior_pid = 42000; |
4fb7359d SG |
574 | /* Start the remote connection; if error (0), discard this target. |
575 | In particular, if the user quits, be sure to discard it | |
576 | (we'd be in an inconsistent state otherwise). */ | |
577 | if (!catch_errors (remote_start_remote, (char *)0, | |
45993f61 | 578 | "Couldn't establish connection to remote target\n", RETURN_MASK_ALL)) |
4fb7359d | 579 | pop_target(); |
bd5635a1 RP |
580 | } |
581 | ||
b52cac6b FF |
582 | /* This takes a program previously attached to and detaches it. After |
583 | this is done, GDB can be used to debug some other program. We | |
584 | better not have left any breakpoints in the target program or it'll | |
585 | die when it hits one. */ | |
bd5635a1 RP |
586 | |
587 | static void | |
588 | remote_detach (args, from_tty) | |
589 | char *args; | |
590 | int from_tty; | |
591 | { | |
b52cac6b FF |
592 | char buf[PBUFSIZ]; |
593 | ||
bd5635a1 RP |
594 | if (args) |
595 | error ("Argument given to \"detach\" when remotely debugging."); | |
b52cac6b FF |
596 | |
597 | /* Tell the remote target to detach. */ | |
598 | strcpy (buf, "D"); | |
599 | remote_send (buf); | |
600 | ||
bd5635a1 RP |
601 | pop_target (); |
602 | if (from_tty) | |
7c622b41 | 603 | puts_filtered ("Ending remote debugging.\n"); |
bd5635a1 RP |
604 | } |
605 | ||
606 | /* Convert hex digit A to a number. */ | |
607 | ||
608 | static int | |
609 | fromhex (a) | |
610 | int a; | |
611 | { | |
612 | if (a >= '0' && a <= '9') | |
613 | return a - '0'; | |
614 | else if (a >= 'a' && a <= 'f') | |
615 | return a - 'a' + 10; | |
ec10503a | 616 | else |
6c27841f | 617 | error ("Reply contains invalid hex digit %d", a); |
bd5635a1 RP |
618 | } |
619 | ||
620 | /* Convert number NIB to a hex digit. */ | |
621 | ||
622 | static int | |
623 | tohex (nib) | |
624 | int nib; | |
625 | { | |
626 | if (nib < 10) | |
627 | return '0'+nib; | |
628 | else | |
629 | return 'a'+nib-10; | |
630 | } | |
631 | \f | |
632 | /* Tell the remote machine to resume. */ | |
633 | ||
4cc1b3f7 JK |
634 | static enum target_signal last_sent_signal = TARGET_SIGNAL_0; |
635 | int last_sent_step; | |
636 | ||
b543979c | 637 | static void |
d538b510 | 638 | remote_resume (pid, step, siggnal) |
94d4b713 JK |
639 | int pid, step; |
640 | enum target_signal siggnal; | |
bd5635a1 RP |
641 | { |
642 | char buf[PBUFSIZ]; | |
643 | ||
4cc1b3f7 JK |
644 | if (pid == -1) |
645 | set_thread (inferior_pid, 0); | |
646 | else | |
647 | set_thread (pid, 0); | |
bd5635a1 | 648 | |
d538b510 | 649 | dcache_flush (remote_dcache); |
bd5635a1 | 650 | |
4cc1b3f7 JK |
651 | last_sent_signal = siggnal; |
652 | last_sent_step = step; | |
653 | ||
654 | if (siggnal != TARGET_SIGNAL_0) | |
655 | { | |
656 | buf[0] = step ? 'S' : 'C'; | |
657 | buf[1] = tohex (((int)siggnal >> 4) & 0xf); | |
658 | buf[2] = tohex ((int)siggnal & 0xf); | |
659 | buf[3] = '\0'; | |
660 | } | |
661 | else | |
662 | strcpy (buf, step ? "s": "c"); | |
bd5635a1 RP |
663 | |
664 | putpkt (buf); | |
665 | } | |
ebdb9ade | 666 | \f |
b543979c JG |
667 | /* Send ^C to target to halt it. Target will respond, and send us a |
668 | packet. */ | |
669 | ||
5af4f5f6 JK |
670 | static void |
671 | remote_interrupt (signo) | |
e676a15f | 672 | int signo; |
b543979c | 673 | { |
ebdb9ade JK |
674 | /* If this doesn't work, try more severe steps. */ |
675 | signal (signo, remote_interrupt_twice); | |
8f86a4e4 | 676 | |
d0d8484a | 677 | if (remote_debug) |
199b2450 | 678 | printf_unfiltered ("remote_interrupt called\n"); |
8f86a4e4 | 679 | |
b52cac6b FF |
680 | /* Send a break or a ^C, depending on user preference. */ |
681 | if (remote_break) | |
682 | SERIAL_SEND_BREAK (remote_desc); | |
683 | else | |
684 | SERIAL_WRITE (remote_desc, "\003", 1); | |
b543979c JG |
685 | } |
686 | ||
5af4f5f6 JK |
687 | static void (*ofunc)(); |
688 | ||
ebdb9ade JK |
689 | /* The user typed ^C twice. */ |
690 | static void | |
691 | remote_interrupt_twice (signo) | |
692 | int signo; | |
693 | { | |
694 | signal (signo, ofunc); | |
695 | ||
981a3309 SG |
696 | interrupt_query (); |
697 | ||
698 | signal (signo, remote_interrupt); | |
699 | } | |
700 | ||
701 | /* Ask the user what to do when an interrupt is received. */ | |
702 | ||
703 | static void | |
704 | interrupt_query () | |
705 | { | |
ebdb9ade | 706 | target_terminal_ours (); |
981a3309 | 707 | |
6b27ebe8 | 708 | if (query ("Interrupted while waiting for the program.\n\ |
ebdb9ade JK |
709 | Give up (and stop debugging it)? ")) |
710 | { | |
711 | target_mourn_inferior (); | |
e50ebec8 | 712 | return_to_top_level (RETURN_QUIT); |
ebdb9ade | 713 | } |
981a3309 SG |
714 | |
715 | target_terminal_inferior (); | |
ebdb9ade | 716 | } |
b543979c | 717 | |
4cc1b3f7 JK |
718 | /* If nonzero, ignore the next kill. */ |
719 | int kill_kludge; | |
720 | ||
bd5635a1 | 721 | /* Wait until the remote machine stops, then return, |
e1ce8aa5 JK |
722 | storing status in STATUS just as `wait' would. |
723 | Returns "pid" (though it's not clear what, if anything, that | |
724 | means in the case of this target). */ | |
bd5635a1 | 725 | |
b543979c | 726 | static int |
d0d8484a SG |
727 | remote_wait (pid, status) |
728 | int pid; | |
94d4b713 | 729 | struct target_waitstatus *status; |
bd5635a1 RP |
730 | { |
731 | unsigned char buf[PBUFSIZ]; | |
4cc1b3f7 | 732 | int thread_num = -1; |
8f86a4e4 | 733 | |
94d4b713 JK |
734 | status->kind = TARGET_WAITKIND_EXITED; |
735 | status->value.integer = 0; | |
b543979c | 736 | |
4f8a48e5 | 737 | while (1) |
8f86a4e4 | 738 | { |
4f8a48e5 | 739 | unsigned char *p; |
a03d4f8e | 740 | |
4f8a48e5 ILT |
741 | ofunc = (void (*)()) signal (SIGINT, remote_interrupt); |
742 | getpkt ((char *) buf, 1); | |
743 | signal (SIGINT, ofunc); | |
4ecee2f9 | 744 | |
754e5da2 | 745 | switch (buf[0]) |
8f86a4e4 | 746 | { |
754e5da2 SG |
747 | case 'E': /* Error of some sort */ |
748 | warning ("Remote failure reply: %s", buf); | |
749 | continue; | |
750 | case 'T': /* Status with PC, SP, FP, ... */ | |
751 | { | |
752 | int i; | |
753 | long regno; | |
754 | char regs[MAX_REGISTER_RAW_SIZE]; | |
a03d4f8e | 755 | |
754e5da2 SG |
756 | /* Expedited reply, containing Signal, {regno, reg} repeat */ |
757 | /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where | |
758 | ss = signal number | |
759 | n... = register number | |
760 | r... = register contents | |
761 | */ | |
5af4f5f6 | 762 | |
754e5da2 | 763 | p = &buf[3]; /* after Txx */ |
5af4f5f6 | 764 | |
754e5da2 SG |
765 | while (*p) |
766 | { | |
767 | unsigned char *p1; | |
45993f61 | 768 | char *p_temp; |
5af4f5f6 | 769 | |
2b576293 | 770 | regno = strtol ((const char *) p, &p_temp, 16); /* Read the register number */ |
45993f61 | 771 | p1 = (unsigned char *)p_temp; |
5af4f5f6 | 772 | |
754e5da2 | 773 | if (p1 == p) |
754e5da2 | 774 | { |
2b576293 | 775 | p1 = (unsigned char *) strchr ((const char *) p, ':'); |
4cc1b3f7 JK |
776 | if (p1 == NULL) |
777 | warning ("Malformed packet (missing colon): %s\n\ | |
778 | Packet: '%s'\n", | |
779 | p, buf); | |
2b576293 | 780 | if (strncmp ((const char *) p, "thread", p1 - p) == 0) |
4cc1b3f7 | 781 | { |
2b576293 | 782 | thread_num = strtol ((const char *) ++p1, &p_temp, 16); |
45993f61 | 783 | p = (unsigned char *)p_temp; |
4cc1b3f7 JK |
784 | } |
785 | } | |
786 | else | |
787 | { | |
788 | p = p1; | |
789 | ||
790 | if (*p++ != ':') | |
791 | warning ("Malformed packet (missing colon): %s\n\ | |
792 | Packet: '%s'\n", | |
793 | p, buf); | |
794 | ||
795 | if (regno >= NUM_REGS) | |
2b576293 | 796 | warning ("Remote sent bad register number %ld: %s\n\ |
4cc1b3f7 JK |
797 | Packet: '%s'\n", |
798 | regno, p, buf); | |
799 | ||
800 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i++) | |
801 | { | |
802 | if (p[0] == 0 || p[1] == 0) | |
803 | warning ("Remote reply is too short: %s", buf); | |
0d14c7df | 804 | regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); |
4cc1b3f7 JK |
805 | p += 2; |
806 | } | |
807 | supply_register (regno, regs); | |
754e5da2 | 808 | } |
4f8a48e5 | 809 | |
754e5da2 SG |
810 | if (*p++ != ';') |
811 | warning ("Remote register badly formatted: %s", buf); | |
754e5da2 SG |
812 | } |
813 | } | |
814 | /* fall through */ | |
815 | case 'S': /* Old style status, just signal only */ | |
816 | status->kind = TARGET_WAITKIND_STOPPED; | |
817 | status->value.sig = (enum target_signal) | |
818 | (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); | |
4f8a48e5 | 819 | |
4cc1b3f7 | 820 | goto got_status; |
754e5da2 SG |
821 | case 'W': /* Target exited */ |
822 | { | |
823 | /* The remote process exited. */ | |
824 | status->kind = TARGET_WAITKIND_EXITED; | |
825 | status->value.integer = (fromhex (buf[1]) << 4) + fromhex (buf[2]); | |
4cc1b3f7 | 826 | goto got_status; |
754e5da2 | 827 | } |
4cc1b3f7 JK |
828 | case 'X': |
829 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
830 | status->value.sig = (enum target_signal) | |
831 | (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); | |
832 | kill_kludge = 1; | |
833 | ||
834 | goto got_status; | |
754e5da2 | 835 | case 'O': /* Console output */ |
998cfe7d SC |
836 | for (p = buf + 1; *p; p +=2) |
837 | { | |
838 | char tb[2]; | |
839 | char c = fromhex (p[0]) * 16 + fromhex (p[1]); | |
840 | tb[0] = c; | |
841 | tb[1] = 0; | |
842 | if (target_output_hook) | |
843 | target_output_hook (tb); | |
844 | else | |
845 | fputs_filtered (tb, gdb_stdout); | |
846 | } | |
754e5da2 | 847 | continue; |
4cc1b3f7 JK |
848 | case '\0': |
849 | if (last_sent_signal != TARGET_SIGNAL_0) | |
850 | { | |
851 | /* Zero length reply means that we tried 'S' or 'C' and | |
852 | the remote system doesn't support it. */ | |
853 | target_terminal_ours_for_output (); | |
854 | printf_filtered | |
855 | ("Can't send signals to this remote system. %s not sent.\n", | |
856 | target_signal_to_name (last_sent_signal)); | |
857 | last_sent_signal = TARGET_SIGNAL_0; | |
858 | target_terminal_inferior (); | |
859 | ||
2b576293 C |
860 | strcpy ((char *) buf, last_sent_step ? "s" : "c"); |
861 | putpkt ((char *) buf); | |
4cc1b3f7 JK |
862 | continue; |
863 | } | |
864 | /* else fallthrough */ | |
754e5da2 SG |
865 | default: |
866 | warning ("Invalid remote reply: %s", buf); | |
867 | continue; | |
4f8a48e5 | 868 | } |
758aeb93 | 869 | } |
4cc1b3f7 JK |
870 | got_status: |
871 | if (thread_num != -1) | |
872 | { | |
873 | /* Initial thread value can only be acquired via wait, so deal with | |
874 | this marker which is used before the first thread value is | |
875 | acquired. */ | |
876 | if (inferior_pid == 42000) | |
877 | { | |
878 | inferior_pid = thread_num; | |
879 | add_thread (inferior_pid); | |
880 | } | |
881 | return thread_num; | |
882 | } | |
883 | return inferior_pid; | |
bd5635a1 RP |
884 | } |
885 | ||
55fea07b JK |
886 | /* Number of bytes of registers this stub implements. */ |
887 | static int register_bytes_found; | |
888 | ||
bd5635a1 | 889 | /* Read the remote registers into the block REGS. */ |
e1ce8aa5 JK |
890 | /* Currently we just read all the registers, so we don't use regno. */ |
891 | /* ARGSUSED */ | |
b543979c | 892 | static void |
bd5635a1 RP |
893 | remote_fetch_registers (regno) |
894 | int regno; | |
895 | { | |
896 | char buf[PBUFSIZ]; | |
897 | int i; | |
898 | char *p; | |
899 | char regs[REGISTER_BYTES]; | |
900 | ||
4cc1b3f7 JK |
901 | set_thread (inferior_pid, 1); |
902 | ||
bd5635a1 RP |
903 | sprintf (buf, "g"); |
904 | remote_send (buf); | |
905 | ||
55fea07b JK |
906 | /* Unimplemented registers read as all bits zero. */ |
907 | memset (regs, 0, REGISTER_BYTES); | |
908 | ||
981a3309 SG |
909 | /* We can get out of synch in various cases. If the first character |
910 | in the buffer is not a hex character, assume that has happened | |
911 | and try to fetch another packet to read. */ | |
912 | while ((buf[0] < '0' || buf[0] > '9') | |
913 | && (buf[0] < 'a' || buf[0] > 'f')) | |
914 | { | |
d0d8484a | 915 | if (remote_debug) |
199b2450 | 916 | printf_unfiltered ("Bad register packet; fetching a new packet\n"); |
981a3309 SG |
917 | getpkt (buf, 0); |
918 | } | |
919 | ||
bd5635a1 RP |
920 | /* Reply describes registers byte by byte, each byte encoded as two |
921 | hex characters. Suck them all up, then supply them to the | |
922 | register cacheing/storage mechanism. */ | |
923 | ||
924 | p = buf; | |
925 | for (i = 0; i < REGISTER_BYTES; i++) | |
926 | { | |
55fea07b JK |
927 | if (p[0] == 0) |
928 | break; | |
929 | if (p[1] == 0) | |
930 | { | |
931 | warning ("Remote reply is of odd length: %s", buf); | |
932 | /* Don't change register_bytes_found in this case, and don't | |
933 | print a second warning. */ | |
934 | goto supply_them; | |
935 | } | |
bd5635a1 RP |
936 | regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); |
937 | p += 2; | |
938 | } | |
55fea07b JK |
939 | |
940 | if (i != register_bytes_found) | |
941 | { | |
942 | register_bytes_found = i; | |
943 | #ifdef REGISTER_BYTES_OK | |
944 | if (!REGISTER_BYTES_OK (i)) | |
945 | warning ("Remote reply is too short: %s", buf); | |
946 | #endif | |
947 | } | |
948 | ||
949 | supply_them: | |
bd5635a1 RP |
950 | for (i = 0; i < NUM_REGS; i++) |
951 | supply_register (i, ®s[REGISTER_BYTE(i)]); | |
bd5635a1 RP |
952 | } |
953 | ||
4aa6fe10 JK |
954 | /* Prepare to store registers. Since we may send them all (using a |
955 | 'G' request), we have to read out the ones we don't want to change | |
956 | first. */ | |
bd5635a1 | 957 | |
b543979c | 958 | static void |
bd5635a1 RP |
959 | remote_prepare_to_store () |
960 | { | |
34517ebc JG |
961 | /* Make sure the entire registers array is valid. */ |
962 | read_register_bytes (0, (char *)NULL, REGISTER_BYTES); | |
bd5635a1 RP |
963 | } |
964 | ||
4aa6fe10 JK |
965 | /* Store register REGNO, or all registers if REGNO == -1, from the contents |
966 | of REGISTERS. FIXME: ignores errors. */ | |
bd5635a1 | 967 | |
b543979c | 968 | static void |
bd5635a1 RP |
969 | remote_store_registers (regno) |
970 | int regno; | |
971 | { | |
972 | char buf[PBUFSIZ]; | |
973 | int i; | |
974 | char *p; | |
975 | ||
4cc1b3f7 JK |
976 | set_thread (inferior_pid, 1); |
977 | ||
4aa6fe10 JK |
978 | if (regno >= 0 && stub_supports_P) |
979 | { | |
980 | /* Try storing a single register. */ | |
981 | char *regp; | |
982 | ||
0c993550 | 983 | sprintf (buf, "P%x=", regno); |
4aa6fe10 JK |
984 | p = buf + strlen (buf); |
985 | regp = ®isters[REGISTER_BYTE (regno)]; | |
986 | for (i = 0; i < REGISTER_RAW_SIZE (regno); ++i) | |
987 | { | |
988 | *p++ = tohex ((regp[i] >> 4) & 0xf); | |
989 | *p++ = tohex (regp[i] & 0xf); | |
990 | } | |
991 | *p = '\0'; | |
992 | remote_send (buf); | |
993 | if (buf[0] != '\0') | |
994 | { | |
995 | /* The stub understands the 'P' request. We are done. */ | |
996 | return; | |
997 | } | |
998 | ||
999 | /* The stub does not support the 'P' request. Use 'G' instead, | |
1000 | and don't try using 'P' in the future (it will just waste our | |
1001 | time). */ | |
1002 | stub_supports_P = 0; | |
1003 | } | |
1004 | ||
bd5635a1 | 1005 | buf[0] = 'G'; |
4aa6fe10 | 1006 | |
bd5635a1 RP |
1007 | /* Command describes registers byte by byte, |
1008 | each byte encoded as two hex characters. */ | |
1009 | ||
1010 | p = buf + 1; | |
55fea07b JK |
1011 | /* remote_prepare_to_store insures that register_bytes_found gets set. */ |
1012 | for (i = 0; i < register_bytes_found; i++) | |
bd5635a1 RP |
1013 | { |
1014 | *p++ = tohex ((registers[i] >> 4) & 0xf); | |
1015 | *p++ = tohex (registers[i] & 0xf); | |
1016 | } | |
1017 | *p = '\0'; | |
1018 | ||
1019 | remote_send (buf); | |
bd5635a1 RP |
1020 | } |
1021 | ||
45993f61 SC |
1022 | /* |
1023 | Use of the data cache *used* to be disabled because it loses for looking at | |
b43e0347 | 1024 | and changing hardware I/O ports and the like. Accepting `volatile' |
45993f61 SC |
1025 | would perhaps be one way to fix it. Another idea would be to use the |
1026 | executable file for the text segment (for all SEC_CODE sections? | |
1027 | For all SEC_READONLY sections?). This has problems if you want to | |
1028 | actually see what the memory contains (e.g. self-modifying code, | |
1029 | clobbered memory, user downloaded the wrong thing). | |
1030 | ||
1031 | Because it speeds so much up, it's now enabled, if you're playing | |
1032 | with registers you turn it of (set remotecache 0) | |
1033 | */ | |
b43e0347 | 1034 | |
bd5635a1 RP |
1035 | /* Read a word from remote address ADDR and return it. |
1036 | This goes through the data cache. */ | |
1037 | ||
2b576293 | 1038 | #if 0 /* unused? */ |
b43e0347 | 1039 | static int |
bd5635a1 RP |
1040 | remote_fetch_word (addr) |
1041 | CORE_ADDR addr; | |
1042 | { | |
d538b510 | 1043 | return dcache_fetch (remote_dcache, addr); |
bd5635a1 RP |
1044 | } |
1045 | ||
1046 | /* Write a word WORD into remote address ADDR. | |
1047 | This goes through the data cache. */ | |
1048 | ||
b43e0347 | 1049 | static void |
bd5635a1 RP |
1050 | remote_store_word (addr, word) |
1051 | CORE_ADDR addr; | |
1052 | int word; | |
1053 | { | |
d538b510 | 1054 | dcache_poke (remote_dcache, addr, word); |
bd5635a1 | 1055 | } |
2b576293 | 1056 | #endif /* 0 (unused?) */ |
45993f61 | 1057 | |
bd5635a1 RP |
1058 | \f |
1059 | /* Write memory data directly to the remote machine. | |
1060 | This does not inform the data cache; the data cache uses this. | |
1061 | MEMADDR is the address in the remote memory space. | |
1062 | MYADDR is the address of the buffer in our space. | |
d538b510 | 1063 | LEN is the number of bytes. |
bd5635a1 | 1064 | |
d538b510 RP |
1065 | Returns number of bytes transferred, or 0 for error. */ |
1066 | ||
1067 | static int | |
bd5635a1 RP |
1068 | remote_write_bytes (memaddr, myaddr, len) |
1069 | CORE_ADDR memaddr; | |
43fc25c8 | 1070 | char *myaddr; |
bd5635a1 RP |
1071 | int len; |
1072 | { | |
1073 | char buf[PBUFSIZ]; | |
1074 | int i; | |
1075 | char *p; | |
ec10503a SC |
1076 | int done; |
1077 | /* Chop the transfer down if necessary */ | |
bd5635a1 | 1078 | |
ec10503a SC |
1079 | done = 0; |
1080 | while (done < len) | |
1081 | { | |
1082 | int todo = len - done; | |
fea17b55 SS |
1083 | int cando = min(remote_write_size, PBUFSIZ) / 2 - 32; /* num bytes that will fit */ |
1084 | ||
ec10503a SC |
1085 | if (todo > cando) |
1086 | todo = cando; | |
bd5635a1 | 1087 | |
ec10503a SC |
1088 | /* FIXME-32x64: Need a version of print_address_numeric which puts the |
1089 | result in a buffer like sprintf. */ | |
1090 | sprintf (buf, "M%lx,%x:", (unsigned long) memaddr + done, todo); | |
bd5635a1 | 1091 | |
ec10503a SC |
1092 | /* We send target system values byte by byte, in increasing byte addresses, |
1093 | each byte encoded as two hex characters. */ | |
bd5635a1 | 1094 | |
ec10503a SC |
1095 | p = buf + strlen (buf); |
1096 | for (i = 0; i < todo; i++) | |
1097 | { | |
1098 | *p++ = tohex ((myaddr[i + done] >> 4) & 0xf); | |
1099 | *p++ = tohex (myaddr[i + done] & 0xf); | |
1100 | } | |
1101 | *p = '\0'; | |
d538b510 | 1102 | |
ec10503a SC |
1103 | putpkt (buf); |
1104 | getpkt (buf, 0); | |
1105 | ||
1106 | if (buf[0] == 'E') | |
1107 | { | |
1108 | /* There is no correspondance between what the remote protocol uses | |
1109 | for errors and errno codes. We would like a cleaner way of | |
1110 | representing errors (big enough to include errno codes, bfd_error | |
1111 | codes, and others). But for now just return EIO. */ | |
1112 | errno = EIO; | |
1113 | return 0; | |
1114 | } | |
1115 | done += todo; | |
d538b510 RP |
1116 | } |
1117 | return len; | |
bd5635a1 RP |
1118 | } |
1119 | ||
1120 | /* Read memory data directly from the remote machine. | |
1121 | This does not use the data cache; the data cache uses this. | |
1122 | MEMADDR is the address in the remote memory space. | |
1123 | MYADDR is the address of the buffer in our space. | |
d538b510 | 1124 | LEN is the number of bytes. |
bd5635a1 | 1125 | |
d538b510 RP |
1126 | Returns number of bytes transferred, or 0 for error. */ |
1127 | ||
1128 | static int | |
bd5635a1 RP |
1129 | remote_read_bytes (memaddr, myaddr, len) |
1130 | CORE_ADDR memaddr; | |
43fc25c8 | 1131 | char *myaddr; |
bd5635a1 RP |
1132 | int len; |
1133 | { | |
1134 | char buf[PBUFSIZ]; | |
1135 | int i; | |
1136 | char *p; | |
0d14c7df FF |
1137 | int done; |
1138 | /* Chop transfer down if neccessary */ | |
bd5635a1 | 1139 | |
0d14c7df FF |
1140 | #if 0 |
1141 | /* FIXME: This is wrong for larger packets */ | |
bd5635a1 RP |
1142 | if (len > PBUFSIZ / 2 - 1) |
1143 | abort (); | |
0d14c7df FF |
1144 | #endif |
1145 | done = 0; | |
1146 | while (done < len) | |
1147 | { | |
1148 | int todo = len - done; | |
1149 | int cando = PBUFSIZ / 2 - 32; /* number of bytes that will fit. */ | |
1150 | if (todo > cando) | |
1151 | todo = cando; | |
bd5635a1 | 1152 | |
0d14c7df FF |
1153 | /* FIXME-32x64: Need a version of print_address_numeric which puts the |
1154 | result in a buffer like sprintf. */ | |
b52cac6b | 1155 | sprintf (buf, "m%lx,%x", (unsigned long) memaddr + done, todo); |
0d14c7df FF |
1156 | putpkt (buf); |
1157 | getpkt (buf, 0); | |
d538b510 | 1158 | |
0d14c7df FF |
1159 | if (buf[0] == 'E') |
1160 | { | |
1161 | /* There is no correspondance between what the remote protocol uses | |
1162 | for errors and errno codes. We would like a cleaner way of | |
1163 | representing errors (big enough to include errno codes, bfd_error | |
1164 | codes, and others). But for now just return EIO. */ | |
1165 | errno = EIO; | |
1166 | return 0; | |
1167 | } | |
bd5635a1 | 1168 | |
b543979c | 1169 | /* Reply describes memory byte by byte, |
bd5635a1 RP |
1170 | each byte encoded as two hex characters. */ |
1171 | ||
0d14c7df FF |
1172 | p = buf; |
1173 | for (i = 0; i < todo; i++) | |
1174 | { | |
1175 | if (p[0] == 0 || p[1] == 0) | |
1176 | /* Reply is short. This means that we were able to read only part | |
1177 | of what we wanted to. */ | |
b52cac6b | 1178 | return i + done; |
0d14c7df FF |
1179 | myaddr[i + done] = fromhex (p[0]) * 16 + fromhex (p[1]); |
1180 | p += 2; | |
1181 | } | |
1182 | done += todo; | |
bd5635a1 | 1183 | } |
0d14c7df | 1184 | return len; |
bd5635a1 RP |
1185 | } |
1186 | \f | |
1187 | /* Read or write LEN bytes from inferior memory at MEMADDR, transferring | |
e1ce8aa5 | 1188 | to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is |
bd5635a1 RP |
1189 | nonzero. Returns length of data written or read; 0 for error. */ |
1190 | ||
b543979c JG |
1191 | /* ARGSUSED */ |
1192 | static int | |
1193 | remote_xfer_memory(memaddr, myaddr, len, should_write, target) | |
bd5635a1 RP |
1194 | CORE_ADDR memaddr; |
1195 | char *myaddr; | |
1196 | int len; | |
e1ce8aa5 | 1197 | int should_write; |
b543979c | 1198 | struct target_ops *target; /* ignored */ |
bd5635a1 | 1199 | { |
45993f61 | 1200 | return dcache_xfer_memory (remote_dcache, memaddr, myaddr, len, should_write); |
bd5635a1 RP |
1201 | } |
1202 | ||
45993f61 | 1203 | |
94d4b713 JK |
1204 | #if 0 |
1205 | /* Enable after 4.12. */ | |
1206 | ||
1207 | void | |
1208 | remote_search (len, data, mask, startaddr, increment, lorange, hirange | |
1209 | addr_found, data_found) | |
1210 | int len; | |
1211 | char *data; | |
1212 | char *mask; | |
1213 | CORE_ADDR startaddr; | |
1214 | int increment; | |
1215 | CORE_ADDR lorange; | |
1216 | CORE_ADDR hirange; | |
1217 | CORE_ADDR *addr_found; | |
1218 | char *data_found; | |
1219 | { | |
1220 | if (increment == -4 && len == 4) | |
1221 | { | |
1222 | long mask_long, data_long; | |
1223 | long data_found_long; | |
1224 | CORE_ADDR addr_we_found; | |
1225 | char buf[PBUFSIZ]; | |
1226 | long returned_long[2]; | |
1227 | char *p; | |
1228 | ||
1229 | mask_long = extract_unsigned_integer (mask, len); | |
1230 | data_long = extract_unsigned_integer (data, len); | |
1231 | sprintf (buf, "t%x:%x,%x", startaddr, data_long, mask_long); | |
1232 | putpkt (buf); | |
1233 | getpkt (buf, 0); | |
1234 | if (buf[0] == '\0') | |
1235 | { | |
1236 | /* The stub doesn't support the 't' request. We might want to | |
1237 | remember this fact, but on the other hand the stub could be | |
1238 | switched on us. Maybe we should remember it only until | |
1239 | the next "target remote". */ | |
1240 | generic_search (len, data, mask, startaddr, increment, lorange, | |
1241 | hirange, addr_found, data_found); | |
1242 | return; | |
1243 | } | |
1244 | ||
1245 | if (buf[0] == 'E') | |
1246 | /* There is no correspondance between what the remote protocol uses | |
1247 | for errors and errno codes. We would like a cleaner way of | |
1248 | representing errors (big enough to include errno codes, bfd_error | |
1249 | codes, and others). But for now just use EIO. */ | |
1250 | memory_error (EIO, startaddr); | |
1251 | p = buf; | |
1252 | addr_we_found = 0; | |
1253 | while (*p != '\0' && *p != ',') | |
1254 | addr_we_found = (addr_we_found << 4) + fromhex (*p++); | |
1255 | if (*p == '\0') | |
1256 | error ("Protocol error: short return for search"); | |
1257 | ||
1258 | data_found_long = 0; | |
1259 | while (*p != '\0' && *p != ',') | |
1260 | data_found_long = (data_found_long << 4) + fromhex (*p++); | |
1261 | /* Ignore anything after this comma, for future extensions. */ | |
1262 | ||
1263 | if (addr_we_found < lorange || addr_we_found >= hirange) | |
1264 | { | |
1265 | *addr_found = 0; | |
1266 | return; | |
1267 | } | |
1268 | ||
1269 | *addr_found = addr_we_found; | |
1270 | *data_found = store_unsigned_integer (data_we_found, len); | |
1271 | return; | |
1272 | } | |
1273 | generic_search (len, data, mask, startaddr, increment, lorange, | |
1274 | hirange, addr_found, data_found); | |
1275 | } | |
1276 | #endif /* 0 */ | |
1277 | \f | |
b543979c | 1278 | static void |
8f86a4e4 | 1279 | remote_files_info (ignore) |
5af4f5f6 | 1280 | struct target_ops *ignore; |
bd5635a1 | 1281 | { |
7c622b41 | 1282 | puts_filtered ("Debugging a target over a serial line.\n"); |
bd5635a1 RP |
1283 | } |
1284 | \f | |
e50ebec8 JK |
1285 | /* Stuff for dealing with the packets which are part of this protocol. |
1286 | See comment at top of file for details. */ | |
bd5635a1 | 1287 | |
ebdb9ade | 1288 | /* Read a single character from the remote end, masking it down to 7 bits. */ |
b543979c | 1289 | |
bd5635a1 | 1290 | static int |
754e5da2 SG |
1291 | readchar (timeout) |
1292 | int timeout; | |
bd5635a1 | 1293 | { |
ebdb9ade | 1294 | int ch; |
bd5635a1 | 1295 | |
ebdb9ade | 1296 | ch = SERIAL_READCHAR (remote_desc, timeout); |
fce7f2d9 | 1297 | |
754e5da2 SG |
1298 | switch (ch) |
1299 | { | |
1300 | case SERIAL_EOF: | |
1301 | error ("Remote connection closed"); | |
1302 | case SERIAL_ERROR: | |
1303 | perror_with_name ("Remote communication error"); | |
1304 | case SERIAL_TIMEOUT: | |
1305 | return ch; | |
1306 | default: | |
1307 | return ch & 0x7f; | |
1308 | } | |
bd5635a1 RP |
1309 | } |
1310 | ||
1311 | /* Send the command in BUF to the remote machine, | |
1312 | and read the reply into BUF. | |
1313 | Report an error if we get an error reply. */ | |
1314 | ||
1315 | static void | |
1316 | remote_send (buf) | |
1317 | char *buf; | |
1318 | { | |
bd5635a1 | 1319 | putpkt (buf); |
7c622b41 | 1320 | getpkt (buf, 0); |
bd5635a1 RP |
1321 | |
1322 | if (buf[0] == 'E') | |
1323 | error ("Remote failure reply: %s", buf); | |
1324 | } | |
1325 | ||
1326 | /* Send a packet to the remote machine, with error checking. | |
1327 | The data of the packet is in BUF. */ | |
1328 | ||
4cc1b3f7 | 1329 | static int |
bd5635a1 RP |
1330 | putpkt (buf) |
1331 | char *buf; | |
1332 | { | |
1333 | int i; | |
1334 | unsigned char csum = 0; | |
b543979c | 1335 | char buf2[PBUFSIZ]; |
bd5635a1 | 1336 | int cnt = strlen (buf); |
ebdb9ade | 1337 | int ch; |
45993f61 | 1338 | int tcount = 0; |
bd5635a1 RP |
1339 | char *p; |
1340 | ||
1341 | /* Copy the packet into buffer BUF2, encapsulating it | |
1342 | and giving it a checksum. */ | |
1343 | ||
b52cac6b | 1344 | if (cnt > (int) sizeof (buf2) - 5) /* Prosanity check */ |
b543979c JG |
1345 | abort(); |
1346 | ||
bd5635a1 RP |
1347 | p = buf2; |
1348 | *p++ = '$'; | |
1349 | ||
1350 | for (i = 0; i < cnt; i++) | |
1351 | { | |
1352 | csum += buf[i]; | |
1353 | *p++ = buf[i]; | |
1354 | } | |
1355 | *p++ = '#'; | |
1356 | *p++ = tohex ((csum >> 4) & 0xf); | |
1357 | *p++ = tohex (csum & 0xf); | |
1358 | ||
1359 | /* Send it over and over until we get a positive ack. */ | |
1360 | ||
6b27ebe8 JK |
1361 | while (1) |
1362 | { | |
1624c38f SG |
1363 | int started_error_output = 0; |
1364 | ||
d0d8484a | 1365 | if (remote_debug) |
6b27ebe8 JK |
1366 | { |
1367 | *p = '\0'; | |
1624c38f SG |
1368 | printf_unfiltered ("Sending packet: %s...", buf2); |
1369 | gdb_flush(gdb_stdout); | |
6b27ebe8 JK |
1370 | } |
1371 | if (SERIAL_WRITE (remote_desc, buf2, p - buf2)) | |
1372 | perror_with_name ("putpkt: write failed"); | |
1373 | ||
1374 | /* read until either a timeout occurs (-2) or '+' is read */ | |
1375 | while (1) | |
1376 | { | |
754e5da2 | 1377 | ch = readchar (remote_timeout); |
6b27ebe8 | 1378 | |
45993f61 | 1379 | if (remote_debug) |
1624c38f SG |
1380 | { |
1381 | switch (ch) | |
1382 | { | |
1383 | case '+': | |
1384 | case SERIAL_TIMEOUT: | |
1624c38f SG |
1385 | case '$': |
1386 | if (started_error_output) | |
1387 | { | |
45993f61 | 1388 | putchar_unfiltered ('\n'); |
1624c38f SG |
1389 | started_error_output = 0; |
1390 | } | |
1391 | } | |
1392 | } | |
1393 | ||
6b27ebe8 JK |
1394 | switch (ch) |
1395 | { | |
1396 | case '+': | |
d0d8484a | 1397 | if (remote_debug) |
199b2450 | 1398 | printf_unfiltered("Ack\n"); |
4cc1b3f7 | 1399 | return 1; |
6b27ebe8 | 1400 | case SERIAL_TIMEOUT: |
45993f61 SC |
1401 | tcount ++; |
1402 | if (tcount > 3) | |
1403 | return 0; | |
6b27ebe8 | 1404 | break; /* Retransmit buffer */ |
1624c38f SG |
1405 | case '$': |
1406 | { | |
6c27841f | 1407 | char junkbuf[PBUFSIZ]; |
1624c38f SG |
1408 | |
1409 | /* It's probably an old response, and we're out of sync. Just | |
1410 | gobble up the packet and ignore it. */ | |
1411 | getpkt (junkbuf, 0); | |
1412 | continue; /* Now, go look for + */ | |
1413 | } | |
6b27ebe8 | 1414 | default: |
d0d8484a | 1415 | if (remote_debug) |
1624c38f SG |
1416 | { |
1417 | if (!started_error_output) | |
1418 | { | |
1419 | started_error_output = 1; | |
1420 | printf_unfiltered ("putpkt: Junk: "); | |
1421 | } | |
45993f61 | 1422 | putchar_unfiltered (ch & 0177); |
1624c38f | 1423 | } |
6b27ebe8 JK |
1424 | continue; |
1425 | } | |
1426 | break; /* Here to retransmit */ | |
1427 | } | |
981a3309 | 1428 | |
94d4b713 JK |
1429 | #if 0 |
1430 | /* This is wrong. If doing a long backtrace, the user should be | |
1431 | able to get out next time we call QUIT, without anything as violent | |
1432 | as interrupt_query. If we want to provide a way out of here | |
1433 | without getting to the next QUIT, it should be based on hitting | |
1434 | ^C twice as in remote_wait. */ | |
981a3309 SG |
1435 | if (quit_flag) |
1436 | { | |
1437 | quit_flag = 0; | |
1438 | interrupt_query (); | |
1439 | } | |
94d4b713 | 1440 | #endif |
6b27ebe8 | 1441 | } |
bd5635a1 RP |
1442 | } |
1443 | ||
754e5da2 SG |
1444 | /* Come here after finding the start of the frame. Collect the rest into BUF, |
1445 | verifying the checksum, length, and handling run-length compression. | |
1446 | Returns 0 on any error, 1 on success. */ | |
1447 | ||
1448 | static int | |
1449 | read_frame (buf) | |
1450 | char *buf; | |
1451 | { | |
1452 | unsigned char csum; | |
1453 | char *bp; | |
1454 | int c; | |
1455 | ||
1456 | csum = 0; | |
1457 | bp = buf; | |
1458 | ||
1459 | while (1) | |
1460 | { | |
1461 | c = readchar (remote_timeout); | |
1462 | ||
1463 | switch (c) | |
1464 | { | |
1465 | case SERIAL_TIMEOUT: | |
1466 | if (remote_debug) | |
1467 | puts_filtered ("Timeout in mid-packet, retrying\n"); | |
1468 | return 0; | |
1469 | case '$': | |
1470 | if (remote_debug) | |
1471 | puts_filtered ("Saw new packet start in middle of old one\n"); | |
1472 | return 0; /* Start a new packet, count retries */ | |
1473 | case '#': | |
1474 | { | |
1475 | unsigned char pktcsum; | |
1476 | ||
1477 | *bp = '\000'; | |
1478 | ||
205fc02b SC |
1479 | pktcsum = fromhex (readchar (remote_timeout)) << 4; |
1480 | pktcsum |= fromhex (readchar (remote_timeout)); | |
754e5da2 SG |
1481 | |
1482 | if (csum == pktcsum) | |
1483 | return 1; | |
1484 | ||
6c27841f SG |
1485 | if (remote_debug) |
1486 | { | |
1487 | printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=", | |
1488 | pktcsum, csum); | |
1489 | puts_filtered (buf); | |
1490 | puts_filtered ("\n"); | |
1491 | } | |
754e5da2 SG |
1492 | return 0; |
1493 | } | |
1494 | case '*': /* Run length encoding */ | |
284f4ee9 | 1495 | csum += c; |
754e5da2 SG |
1496 | c = readchar (remote_timeout); |
1497 | csum += c; | |
1498 | c = c - ' ' + 3; /* Compute repeat count */ | |
1499 | ||
6c27841f SG |
1500 | |
1501 | if (c > 0 && c < 255 && bp + c - 1 < buf + PBUFSIZ - 1) | |
754e5da2 SG |
1502 | { |
1503 | memset (bp, *(bp - 1), c); | |
1504 | bp += c; | |
1505 | continue; | |
1506 | } | |
1507 | ||
1508 | *bp = '\0'; | |
1509 | printf_filtered ("Repeat count %d too large for buffer: ", c); | |
1510 | puts_filtered (buf); | |
1511 | puts_filtered ("\n"); | |
754e5da2 | 1512 | return 0; |
284f4ee9 | 1513 | |
754e5da2 SG |
1514 | default: |
1515 | if (bp < buf + PBUFSIZ - 1) | |
1516 | { | |
1517 | *bp++ = c; | |
1518 | csum += c; | |
1519 | continue; | |
1520 | } | |
1521 | ||
1522 | *bp = '\0'; | |
1523 | puts_filtered ("Remote packet too long: "); | |
1524 | puts_filtered (buf); | |
1525 | puts_filtered ("\n"); | |
1526 | ||
1527 | return 0; | |
1528 | } | |
1529 | } | |
1530 | } | |
1531 | ||
bd5635a1 | 1532 | /* Read a packet from the remote machine, with error checking, |
7c622b41 JG |
1533 | and store it in BUF. BUF is expected to be of size PBUFSIZ. |
1534 | If FOREVER, wait forever rather than timing out; this is used | |
1535 | while the target is executing user code. */ | |
bd5635a1 RP |
1536 | |
1537 | static void | |
754e5da2 SG |
1538 | getpkt (buf, forever) |
1539 | char *buf; | |
ebdb9ade | 1540 | int forever; |
bd5635a1 | 1541 | { |
754e5da2 SG |
1542 | int c; |
1543 | int tries; | |
1544 | int timeout; | |
1545 | int val; | |
94d4b713 | 1546 | |
45993f61 SC |
1547 | strcpy (buf,"timeout"); |
1548 | ||
754e5da2 | 1549 | if (forever) |
45993f61 SC |
1550 | { |
1551 | #ifdef MAINTENANCE_CMDS | |
1552 | timeout = watchdog > 0 ? watchdog : -1; | |
1553 | #else | |
1554 | timeout = -1; | |
1555 | #endif | |
1556 | } | |
1557 | ||
754e5da2 SG |
1558 | else |
1559 | timeout = remote_timeout; | |
bd5635a1 | 1560 | |
45993f61 | 1561 | #define MAX_TRIES 3 |
981a3309 | 1562 | |
754e5da2 SG |
1563 | for (tries = 1; tries <= MAX_TRIES; tries++) |
1564 | { | |
7c622b41 JG |
1565 | /* This can loop forever if the remote side sends us characters |
1566 | continuously, but if it pauses, we'll get a zero from readchar | |
1567 | because of timeout. Then we'll count that as a retry. */ | |
6b27ebe8 | 1568 | |
754e5da2 SG |
1569 | /* Note that we will only wait forever prior to the start of a packet. |
1570 | After that, we expect characters to arrive at a brisk pace. They | |
1571 | should show up within remote_timeout intervals. */ | |
6b27ebe8 | 1572 | |
754e5da2 | 1573 | do |
6b27ebe8 | 1574 | { |
754e5da2 | 1575 | c = readchar (timeout); |
7c622b41 | 1576 | |
ebdb9ade | 1577 | if (c == SERIAL_TIMEOUT) |
7c622b41 | 1578 | { |
45993f61 SC |
1579 | #ifdef MAINTENANCE_CMDS |
1580 | if (forever) /* Watchdog went off. Kill the target. */ | |
1581 | { | |
1582 | target_mourn_inferior (); | |
1583 | error ("Watchdog has expired. Target detached.\n"); | |
1584 | } | |
1585 | #endif | |
d0d8484a | 1586 | if (remote_debug) |
754e5da2 SG |
1587 | puts_filtered ("Timed out.\n"); |
1588 | goto retry; | |
7c622b41 | 1589 | } |
bd5635a1 | 1590 | } |
754e5da2 | 1591 | while (c != '$'); |
bd5635a1 | 1592 | |
754e5da2 | 1593 | /* We've found the start of a packet, now collect the data. */ |
38094c60 | 1594 | |
754e5da2 SG |
1595 | val = read_frame (buf); |
1596 | ||
1597 | if (val == 1) | |
38094c60 | 1598 | { |
754e5da2 SG |
1599 | if (remote_debug) |
1600 | fprintf_unfiltered (gdb_stderr, "Packet received: %s\n", buf); | |
1601 | SERIAL_WRITE (remote_desc, "+", 1); | |
1602 | return; | |
38094c60 | 1603 | } |
754e5da2 SG |
1604 | |
1605 | /* Try the whole thing again. */ | |
45993f61 | 1606 | retry: |
754e5da2 | 1607 | SERIAL_WRITE (remote_desc, "-", 1); |
bd5635a1 RP |
1608 | } |
1609 | ||
754e5da2 | 1610 | /* We have tried hard enough, and just can't receive the packet. Give up. */ |
7c622b41 | 1611 | |
754e5da2 | 1612 | printf_unfiltered ("Ignoring packet error, continuing...\n"); |
ebdb9ade | 1613 | SERIAL_WRITE (remote_desc, "+", 1); |
bd5635a1 RP |
1614 | } |
1615 | \f | |
ebdb9ade JK |
1616 | static void |
1617 | remote_kill () | |
1618 | { | |
4cc1b3f7 JK |
1619 | /* For some mysterious reason, wait_for_inferior calls kill instead of |
1620 | mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */ | |
1621 | if (kill_kludge) | |
1622 | { | |
1623 | kill_kludge = 0; | |
1624 | target_mourn_inferior (); | |
1625 | return; | |
1626 | } | |
1627 | ||
1628 | /* Use catch_errors so the user can quit from gdb even when we aren't on | |
1629 | speaking terms with the remote system. */ | |
1630 | catch_errors (putpkt, "k", "", RETURN_MASK_ERROR); | |
1631 | ||
ebdb9ade JK |
1632 | /* Don't wait for it to die. I'm not really sure it matters whether |
1633 | we do or not. For the existing stubs, kill is a noop. */ | |
1634 | target_mourn_inferior (); | |
1635 | } | |
bd5635a1 | 1636 | |
ebdb9ade JK |
1637 | static void |
1638 | remote_mourn () | |
1639 | { | |
2b576293 C |
1640 | remote_mourn_1 (&remote_ops); |
1641 | } | |
1642 | ||
1643 | static void | |
1644 | extended_remote_mourn () | |
1645 | { | |
1646 | /* We do _not_ want to mourn the target like this; this will | |
1647 | remove the extended remote target from the target stack, | |
1648 | and the next time the user says "run" it'll fail. | |
1649 | ||
1650 | FIXME: What is the right thing to do here? */ | |
1651 | #if 0 | |
1652 | remote_mourn_1 (&extended_remote_ops); | |
1653 | #endif | |
1654 | } | |
1655 | ||
1656 | /* Worker function for remote_mourn. */ | |
1657 | static void | |
1658 | remote_mourn_1 (target) | |
1659 | struct target_ops *target; | |
1660 | { | |
1661 | unpush_target (target); | |
ebdb9ade JK |
1662 | generic_mourn_inferior (); |
1663 | } | |
2b576293 C |
1664 | |
1665 | /* In the extended protocol we want to be able to do things like | |
1666 | "run" and have them basically work as expected. So we need | |
1667 | a special create_inferior function. | |
1668 | ||
1669 | FIXME: One day add support for changing the exec file | |
1670 | we're debugging, arguments and an environment. */ | |
1671 | ||
1672 | static void | |
1673 | extended_remote_create_inferior (exec_file, args, env) | |
1674 | char *exec_file; | |
1675 | char *args; | |
1676 | char **env; | |
1677 | { | |
1678 | /* Rip out the breakpoints; we'll reinsert them after restarting | |
1679 | the remote server. */ | |
1680 | remove_breakpoints (); | |
1681 | ||
1682 | /* Now restart the remote server. */ | |
1683 | extended_remote_restart (); | |
1684 | ||
1685 | /* Now put the breakpoints back in. This way we're safe if the | |
1686 | restart function works via a unix fork on the remote side. */ | |
1687 | insert_breakpoints (); | |
1688 | ||
1689 | /* Clean up from the last time we were running. */ | |
1690 | clear_proceed_status (); | |
1691 | ||
1692 | /* Let the remote process run. */ | |
1693 | proceed (-1, TARGET_SIGNAL_0, 0); | |
1694 | } | |
1695 | ||
ebdb9ade | 1696 | \f |
5af4f5f6 | 1697 | /* On some machines, e.g. 68k, we may use a different breakpoint instruction |
fea17b55 SS |
1698 | than other targets; in those use REMOTE_BREAKPOINT instead of just |
1699 | BREAKPOINT. Also, bi-endian targets may define LITTLE_REMOTE_BREAKPOINT | |
1700 | and BIG_REMOTE_BREAKPOINT. If none of these are defined, we just call | |
1701 | the standard routines that are in mem-break.c. */ | |
1702 | ||
1703 | /* FIXME, these ought to be done in a more dynamic fashion. For instance, | |
1704 | the choice of breakpoint instruction affects target program design and | |
1705 | vice versa, and by making it user-tweakable, the special code here | |
1706 | goes away and we need fewer special GDB configurations. */ | |
1707 | ||
1708 | #if defined (LITTLE_REMOTE_BREAKPOINT) && defined (BIG_REMOTE_BREAKPOINT) && !defined(REMOTE_BREAKPOINT) | |
1709 | #define REMOTE_BREAKPOINT | |
1710 | #endif | |
1711 | ||
1712 | #ifdef REMOTE_BREAKPOINT | |
5af4f5f6 | 1713 | |
fea17b55 SS |
1714 | /* If the target isn't bi-endian, just pretend it is. */ |
1715 | #if !defined (LITTLE_REMOTE_BREAKPOINT) && !defined (BIG_REMOTE_BREAKPOINT) | |
1716 | #define LITTLE_REMOTE_BREAKPOINT REMOTE_BREAKPOINT | |
1717 | #define BIG_REMOTE_BREAKPOINT REMOTE_BREAKPOINT | |
1718 | #endif | |
5af4f5f6 | 1719 | |
fea17b55 SS |
1720 | static unsigned char big_break_insn[] = BIG_REMOTE_BREAKPOINT; |
1721 | static unsigned char little_break_insn[] = LITTLE_REMOTE_BREAKPOINT; | |
5af4f5f6 | 1722 | |
fea17b55 | 1723 | #endif /* REMOTE_BREAKPOINT */ |
5af4f5f6 JK |
1724 | |
1725 | /* Insert a breakpoint on targets that don't have any better breakpoint | |
1726 | support. We read the contents of the target location and stash it, | |
1727 | then overwrite it with a breakpoint instruction. ADDR is the target | |
1728 | location in the target machine. CONTENTS_CACHE is a pointer to | |
1729 | memory allocated for saving the target contents. It is guaranteed | |
1730 | by the caller to be long enough to save sizeof BREAKPOINT bytes (this | |
1731 | is accomplished via BREAKPOINT_MAX). */ | |
1732 | ||
d538b510 | 1733 | static int |
5af4f5f6 JK |
1734 | remote_insert_breakpoint (addr, contents_cache) |
1735 | CORE_ADDR addr; | |
1736 | char *contents_cache; | |
1737 | { | |
fea17b55 | 1738 | #ifdef REMOTE_BREAKPOINT |
5af4f5f6 JK |
1739 | int val; |
1740 | ||
fea17b55 | 1741 | val = target_read_memory (addr, contents_cache, sizeof big_break_insn); |
5af4f5f6 JK |
1742 | |
1743 | if (val == 0) | |
fea17b55 SS |
1744 | { |
1745 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) | |
1746 | val = target_write_memory (addr, (char *) big_break_insn, | |
1747 | sizeof big_break_insn); | |
1748 | else | |
1749 | val = target_write_memory (addr, (char *) little_break_insn, | |
1750 | sizeof little_break_insn); | |
1751 | } | |
5af4f5f6 JK |
1752 | |
1753 | return val; | |
fea17b55 SS |
1754 | #else |
1755 | return memory_insert_breakpoint (addr, contents_cache); | |
1756 | #endif /* REMOTE_BREAKPOINT */ | |
5af4f5f6 JK |
1757 | } |
1758 | ||
d538b510 | 1759 | static int |
5af4f5f6 JK |
1760 | remote_remove_breakpoint (addr, contents_cache) |
1761 | CORE_ADDR addr; | |
1762 | char *contents_cache; | |
1763 | { | |
fea17b55 SS |
1764 | #ifdef REMOTE_BREAKPOINT |
1765 | return target_write_memory (addr, contents_cache, sizeof big_break_insn); | |
1766 | #else | |
1767 | return memory_remove_breakpoint (addr, contents_cache); | |
1768 | #endif /* REMOTE_BREAKPOINT */ | |
5af4f5f6 JK |
1769 | } |
1770 | \f | |
bd5635a1 RP |
1771 | /* Define the target subroutine names */ |
1772 | ||
1773 | struct target_ops remote_ops = { | |
b543979c JG |
1774 | "remote", /* to_shortname */ |
1775 | "Remote serial target in gdb-specific protocol", /* to_longname */ | |
1776 | "Use a remote computer via a serial line, using a gdb-specific protocol.\n\ | |
1777 | Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */ | |
1778 | remote_open, /* to_open */ | |
1779 | remote_close, /* to_close */ | |
1780 | NULL, /* to_attach */ | |
1781 | remote_detach, /* to_detach */ | |
1782 | remote_resume, /* to_resume */ | |
1783 | remote_wait, /* to_wait */ | |
1784 | remote_fetch_registers, /* to_fetch_registers */ | |
1785 | remote_store_registers, /* to_store_registers */ | |
1786 | remote_prepare_to_store, /* to_prepare_to_store */ | |
b543979c JG |
1787 | remote_xfer_memory, /* to_xfer_memory */ |
1788 | remote_files_info, /* to_files_info */ | |
5af4f5f6 JK |
1789 | remote_insert_breakpoint, /* to_insert_breakpoint */ |
1790 | remote_remove_breakpoint, /* to_remove_breakpoint */ | |
b543979c JG |
1791 | NULL, /* to_terminal_init */ |
1792 | NULL, /* to_terminal_inferior */ | |
1793 | NULL, /* to_terminal_ours_for_output */ | |
1794 | NULL, /* to_terminal_ours */ | |
1795 | NULL, /* to_terminal_info */ | |
ebdb9ade | 1796 | remote_kill, /* to_kill */ |
6b27ebe8 | 1797 | generic_load, /* to_load */ |
b543979c JG |
1798 | NULL, /* to_lookup_symbol */ |
1799 | NULL, /* to_create_inferior */ | |
ebdb9ade | 1800 | remote_mourn, /* to_mourn_inferior */ |
34517ebc | 1801 | 0, /* to_can_run */ |
7c622b41 | 1802 | 0, /* to_notice_signals */ |
43fc25c8 | 1803 | remote_thread_alive, /* to_thread_alive */ |
6c27841f | 1804 | 0, /* to_stop */ |
b543979c JG |
1805 | process_stratum, /* to_stratum */ |
1806 | NULL, /* to_next */ | |
1807 | 1, /* to_has_all_memory */ | |
1808 | 1, /* to_has_memory */ | |
1809 | 1, /* to_has_stack */ | |
1810 | 1, /* to_has_registers */ | |
1811 | 1, /* to_has_execution */ | |
1812 | NULL, /* sections */ | |
1813 | NULL, /* sections_end */ | |
1814 | OPS_MAGIC /* to_magic */ | |
bd5635a1 RP |
1815 | }; |
1816 | ||
2b576293 C |
1817 | struct target_ops extended_remote_ops = { |
1818 | "extended-remote", /* to_shortname */ | |
1819 | "Extended remote serial target in gdb-specific protocol",/* to_longname */ | |
1820 | "Use a remote computer via a serial line, using a gdb-specific protocol.\n\ | |
1821 | Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */ | |
1822 | extended_remote_open, /* to_open */ | |
1823 | remote_close, /* to_close */ | |
1824 | NULL, /* to_attach */ | |
1825 | remote_detach, /* to_detach */ | |
1826 | remote_resume, /* to_resume */ | |
1827 | remote_wait, /* to_wait */ | |
1828 | remote_fetch_registers, /* to_fetch_registers */ | |
1829 | remote_store_registers, /* to_store_registers */ | |
1830 | remote_prepare_to_store, /* to_prepare_to_store */ | |
1831 | remote_xfer_memory, /* to_xfer_memory */ | |
1832 | remote_files_info, /* to_files_info */ | |
1833 | ||
1834 | remote_insert_breakpoint, /* to_insert_breakpoint */ | |
1835 | remote_remove_breakpoint, /* to_remove_breakpoint */ | |
1836 | ||
1837 | NULL, /* to_terminal_init */ | |
1838 | NULL, /* to_terminal_inferior */ | |
1839 | NULL, /* to_terminal_ours_for_output */ | |
1840 | NULL, /* to_terminal_ours */ | |
1841 | NULL, /* to_terminal_info */ | |
1842 | remote_kill, /* to_kill */ | |
1843 | generic_load, /* to_load */ | |
1844 | NULL, /* to_lookup_symbol */ | |
1845 | extended_remote_create_inferior,/* to_create_inferior */ | |
1846 | extended_remote_mourn, /* to_mourn_inferior */ | |
1847 | 0, /* to_can_run */ | |
1848 | 0, /* to_notice_signals */ | |
1849 | remote_thread_alive, /* to_thread_alive */ | |
1850 | 0, /* to_stop */ | |
1851 | process_stratum, /* to_stratum */ | |
1852 | NULL, /* to_next */ | |
1853 | 1, /* to_has_all_memory */ | |
1854 | 1, /* to_has_memory */ | |
1855 | 1, /* to_has_stack */ | |
1856 | 1, /* to_has_registers */ | |
1857 | 1, /* to_has_execution */ | |
1858 | NULL, /* sections */ | |
1859 | NULL, /* sections_end */ | |
1860 | OPS_MAGIC /* to_magic */ | |
1861 | }; | |
1862 | ||
bd5635a1 RP |
1863 | void |
1864 | _initialize_remote () | |
1865 | { | |
1866 | add_target (&remote_ops); | |
2b576293 | 1867 | add_target (&extended_remote_ops); |
2c441e7f SS |
1868 | |
1869 | add_show_from_set (add_set_cmd ("remotetimeout", no_class, | |
1870 | var_integer, (char *)&remote_timeout, | |
1871 | "Set timeout value for remote read.\n", &setlist), | |
1872 | &showlist); | |
b52cac6b FF |
1873 | |
1874 | add_show_from_set (add_set_cmd ("remotebreak", no_class, | |
1875 | var_integer, (char *)&remote_break, | |
1876 | "Set whether to send break if interrupted.\n", &setlist), | |
1877 | &showlist); | |
fea17b55 SS |
1878 | |
1879 | add_show_from_set (add_set_cmd ("remotewritesize", no_class, | |
1880 | var_integer, (char *)&remote_write_size, | |
1881 | "Set the maximum number of bytes in each memory write packet.\n", &setlist), | |
1882 | &showlist); | |
976bb0be | 1883 | } |