Commit | Line | Data |
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b543979c | 1 | /* Remote target communications for serial-line targets in custom GDB protocol |
45993f61 | 2 | Copyright 1988, 1991, 1992, 1993, 1994, 1995 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 | |
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 | ||
111 | There is no immediate reply to step or cont. | |
112 | The reply comes when the machine stops. | |
4cc1b3f7 | 113 | It is SAA AA is the signal number. |
bd5635a1 | 114 | |
4cc1b3f7 | 115 | or... TAAn...:r...;n...:r...;n...:r...; |
e50ebec8 | 116 | AA = signal number |
4cc1b3f7 JK |
117 | n... = register number (hex) |
118 | r... = register contents | |
119 | n... = `thread' | |
120 | r... = thread process ID. This is | |
121 | a hex integer. | |
122 | n... = other string not starting | |
123 | with valid hex digit. | |
124 | gdb should ignore this n,r pair | |
125 | and go on to the next. This way | |
126 | we can extend the protocol. | |
72bba93b | 127 | or... WAA The process exited, and AA is |
758aeb93 ILT |
128 | the exit status. This is only |
129 | applicable for certains sorts of | |
130 | targets. | |
4cc1b3f7 JK |
131 | or... XAA The process terminated with signal |
132 | AA. | |
133 | or... Otext Send text to stdout. This can happen | |
134 | at any time while the program is | |
135 | running and the debugger should | |
136 | continue to wait for 'W', 'T', etc. | |
137 | ||
2b576293 C |
138 | thread alive TXX Find out if the thread XX is alive. |
139 | reply OK thread is still alive | |
140 | ENN thread is dead | |
141 | ||
142 | remote restart RXX Restart the remote server | |
143 | ||
144 | extended ops ! Use the extended remote protocol. | |
145 | Sticky -- only needs to be set once. | |
146 | ||
d538b510 RP |
147 | kill request k |
148 | ||
149 | toggle debug d toggle debug flag (see 386 & 68k stubs) | |
150 | reset r reset -- see sparc stub. | |
151 | reserved <other> On other requests, the stub should | |
152 | ignore the request and send an empty | |
153 | response ($#<checksum>). This way | |
154 | we can extend the protocol and GDB | |
155 | can tell whether the stub it is | |
156 | talking to uses the old or the new. | |
72bba93b | 157 | search tAA:PP,MM Search backwards starting at address |
94d4b713 JK |
158 | AA for a match with pattern PP and |
159 | mask MM. PP and MM are 4 bytes. | |
160 | Not supported by all stubs. | |
161 | ||
72bba93b SG |
162 | general query qXXXX Request info about XXXX. |
163 | general set QXXXX=yyyy Set value of XXXX to yyyy. | |
164 | query sect offs qOffsets Get section offsets. Reply is | |
165 | Text=xxx;Data=yyy;Bss=zzz | |
72bba93b | 166 | |
94d4b713 | 167 | Responses can be run-length encoded to save space. A '*' means that |
284f4ee9 | 168 | the next character is an ASCII encoding giving a repeat count which |
94d4b713 | 169 | stands for that many repititions of the character preceding the '*'. |
284f4ee9 SC |
170 | The encoding is n+29, yielding a printable character where n >=3 |
171 | (which is where rle starts to win). Don't use an n > 126. | |
172 | ||
173 | So | |
174 | "0* " means the same as "0000". */ | |
bd5635a1 | 175 | |
d747e0af | 176 | #include "defs.h" |
2b576293 | 177 | #include "gdb_string.h" |
bd5635a1 | 178 | #include <fcntl.h> |
bd5635a1 RP |
179 | #include "frame.h" |
180 | #include "inferior.h" | |
e50ebec8 | 181 | #include "bfd.h" |
6b27ebe8 | 182 | #include "symfile.h" |
bd5635a1 RP |
183 | #include "target.h" |
184 | #include "wait.h" | |
185 | #include "terminal.h" | |
8f86a4e4 | 186 | #include "gdbcmd.h" |
758aeb93 ILT |
187 | #include "objfiles.h" |
188 | #include "gdb-stabs.h" | |
45993f61 | 189 | #include "thread.h" |
bd5635a1 | 190 | |
d538b510 RP |
191 | #include "dcache.h" |
192 | ||
bd5635a1 RP |
193 | #ifdef USG |
194 | #include <sys/types.h> | |
195 | #endif | |
196 | ||
197 | #include <signal.h> | |
ebdb9ade | 198 | #include "serial.h" |
bd5635a1 | 199 | |
b543979c JG |
200 | /* Prototypes for local functions */ |
201 | ||
45993f61 | 202 | static int remote_write_bytes PARAMS ((CORE_ADDR memaddr, |
43fc25c8 | 203 | char *myaddr, int len)); |
b543979c | 204 | |
45993f61 | 205 | static int remote_read_bytes PARAMS ((CORE_ADDR memaddr, |
43fc25c8 | 206 | char *myaddr, int len)); |
b543979c | 207 | |
45993f61 | 208 | static void remote_files_info PARAMS ((struct target_ops *ignore)); |
b543979c | 209 | |
45993f61 SC |
210 | static int remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, |
211 | int len, int should_write, | |
212 | struct target_ops *target)); | |
b543979c | 213 | |
45993f61 | 214 | static void remote_prepare_to_store PARAMS ((void)); |
b543979c | 215 | |
45993f61 | 216 | static void remote_fetch_registers PARAMS ((int regno)); |
b543979c | 217 | |
45993f61 SC |
218 | static void remote_resume PARAMS ((int pid, int step, |
219 | enum target_signal siggnal)); | |
b543979c | 220 | |
45993f61 | 221 | static int remote_start_remote PARAMS ((char *dummy)); |
7c622b41 | 222 | |
45993f61 | 223 | static void remote_open PARAMS ((char *name, int from_tty)); |
b543979c | 224 | |
2b576293 C |
225 | static void extended_remote_open PARAMS ((char *name, int from_tty)); |
226 | ||
227 | static void remote_open_1 PARAMS ((char *, int, struct target_ops *)); | |
228 | ||
45993f61 | 229 | static void remote_close PARAMS ((int quitting)); |
b543979c | 230 | |
45993f61 | 231 | static void remote_store_registers PARAMS ((int regno)); |
b543979c | 232 | |
2b576293 C |
233 | static void remote_mourn PARAMS ((void)); |
234 | ||
235 | static void extended_remote_restart PARAMS ((void)); | |
236 | ||
237 | static void extended_remote_mourn PARAMS ((void)); | |
238 | ||
239 | static void extended_remote_create_inferior PARAMS ((char *, char *, char **)); | |
240 | ||
241 | static void remote_mourn_1 PARAMS ((struct target_ops *)); | |
242 | ||
45993f61 | 243 | static void getpkt PARAMS ((char *buf, int forever)); |
b543979c | 244 | |
45993f61 | 245 | static int putpkt PARAMS ((char *buf)); |
b543979c | 246 | |
45993f61 | 247 | static void remote_send PARAMS ((char *buf)); |
b543979c | 248 | |
45993f61 | 249 | static int readchar PARAMS ((int timeout)); |
b543979c | 250 | |
94d4b713 | 251 | static int remote_wait PARAMS ((int pid, struct target_waitstatus *status)); |
b543979c | 252 | |
45993f61 | 253 | static void remote_kill PARAMS ((void)); |
b543979c | 254 | |
45993f61 | 255 | static int tohex PARAMS ((int nib)); |
b543979c | 256 | |
45993f61 | 257 | static int fromhex PARAMS ((int a)); |
5af4f5f6 | 258 | |
45993f61 | 259 | static void remote_detach PARAMS ((char *args, int from_tty)); |
5af4f5f6 | 260 | |
45993f61 | 261 | static void remote_interrupt PARAMS ((int signo)); |
b543979c | 262 | |
45993f61 SC |
263 | static void remote_interrupt_twice PARAMS ((int signo)); |
264 | ||
265 | static void interrupt_query PARAMS ((void)); | |
981a3309 | 266 | |
bd5635a1 | 267 | extern struct target_ops remote_ops; /* Forward decl */ |
2b576293 | 268 | extern struct target_ops extended_remote_ops; /* Forward decl */ |
bd5635a1 | 269 | |
ebdb9ade JK |
270 | /* This was 5 seconds, which is a long time to sit and wait. |
271 | Unless this is going though some terminal server or multiplexer or | |
272 | other form of hairy serial connection, I would think 2 seconds would | |
273 | be plenty. */ | |
bd5635a1 | 274 | |
45993f61 | 275 | static int remote_timeout = 2; |
bd5635a1 | 276 | |
16e1d1d3 | 277 | /* Descriptor for I/O to remote machine. Initialize it to NULL so that |
bd5635a1 RP |
278 | remote_open knows that we don't have a file open when the program |
279 | starts. */ | |
ebdb9ade | 280 | serial_t remote_desc = NULL; |
bd5635a1 | 281 | |
4d57c599 JK |
282 | /* Having this larger than 400 causes us to be incompatible with m68k-stub.c |
283 | and i386-stub.c. Normally, no one would notice because it only matters | |
284 | for writing large chunks of memory (e.g. in downloads). Also, this needs | |
285 | to be more than 400 if required to hold the registers (see below, where | |
286 | we round it up based on REGISTER_BYTES). */ | |
287 | #define PBUFSIZ 400 | |
bd5635a1 RP |
288 | |
289 | /* Maximum number of bytes to read/write at once. The value here | |
290 | is chosen to fill up a packet (the headers account for the 32). */ | |
291 | #define MAXBUFBYTES ((PBUFSIZ-32)/2) | |
292 | ||
b543979c | 293 | /* Round up PBUFSIZ to hold all the registers, at least. */ |
2ddeed27 JK |
294 | /* The blank line after the #if seems to be required to work around a |
295 | bug in HP's PA compiler. */ | |
b543979c | 296 | #if REGISTER_BYTES > MAXBUFBYTES |
2ddeed27 JK |
297 | |
298 | #undef PBUFSIZ | |
b543979c | 299 | #define PBUFSIZ (REGISTER_BYTES * 2 + 32) |
bd5635a1 | 300 | #endif |
4aa6fe10 JK |
301 | |
302 | /* Should we try the 'P' request? If this is set to one when the stub | |
303 | doesn't support 'P', the only consequence is some unnecessary traffic. */ | |
304 | static int stub_supports_P = 1; | |
305 | ||
4cc1b3f7 JK |
306 | \f |
307 | /* These are the threads which we last sent to the remote system. -1 for all | |
308 | or -2 for not sent yet. */ | |
309 | int general_thread; | |
310 | int cont_thread; | |
311 | ||
312 | static void | |
313 | set_thread (th, gen) | |
314 | int th; | |
315 | int gen; | |
316 | { | |
317 | char buf[PBUFSIZ]; | |
318 | int state = gen ? general_thread : cont_thread; | |
319 | if (state == th) | |
320 | return; | |
321 | buf[0] = 'H'; | |
322 | buf[1] = gen ? 'g' : 'c'; | |
323 | if (th == 42000) | |
324 | { | |
325 | buf[2] = '0'; | |
326 | buf[3] = '\0'; | |
327 | } | |
328 | else if (th < 0) | |
329 | sprintf (&buf[2], "-%x", -th); | |
330 | else | |
331 | sprintf (&buf[2], "%x", th); | |
332 | putpkt (buf); | |
333 | getpkt (buf, 0); | |
334 | if (gen) | |
335 | general_thread = th; | |
336 | else | |
337 | cont_thread = th; | |
338 | } | |
bd5635a1 | 339 | \f |
2b576293 | 340 | /* Return nonzero if the thread TH is still alive on the remote system. */ |
43fc25c8 JL |
341 | |
342 | static int | |
343 | remote_thread_alive (th) | |
344 | int th; | |
345 | { | |
346 | char buf[PBUFSIZ]; | |
347 | ||
348 | buf[0] = 'T'; | |
349 | if (th < 0) | |
350 | sprintf (&buf[1], "-%x", -th); | |
351 | else | |
352 | sprintf (&buf[1], "%x", th); | |
353 | putpkt (buf); | |
354 | getpkt (buf, 0); | |
355 | return (buf[0] == 'O' && buf[1] == 'K'); | |
356 | } | |
2b576293 C |
357 | |
358 | /* Restart the remote side; this is an extended protocol operation. */ | |
359 | ||
360 | static void | |
361 | extended_remote_restart () | |
362 | { | |
363 | char buf[PBUFSIZ]; | |
364 | ||
365 | /* Send the restart command; for reasons I don't understand the | |
366 | remote side really expects a number after the "R". */ | |
367 | buf[0] = 'R'; | |
368 | sprintf (&buf[1], "%x", 0); | |
369 | putpkt (buf); | |
370 | ||
371 | /* Now query for status so this looks just like we restarted | |
372 | gdbserver from scratch. */ | |
373 | putpkt ("?"); | |
374 | getpkt (buf, 0); | |
375 | } | |
43fc25c8 | 376 | \f |
bd5635a1 RP |
377 | /* Clean up connection to a remote debugger. */ |
378 | ||
e1ce8aa5 | 379 | /* ARGSUSED */ |
b543979c | 380 | static void |
bd5635a1 RP |
381 | remote_close (quitting) |
382 | int quitting; | |
383 | { | |
ebdb9ade JK |
384 | if (remote_desc) |
385 | SERIAL_CLOSE (remote_desc); | |
386 | remote_desc = NULL; | |
b543979c JG |
387 | } |
388 | ||
72bba93b SG |
389 | /* Query the remote side for the text, data and bss offsets. */ |
390 | ||
391 | static void | |
392 | get_offsets () | |
393 | { | |
6c27841f | 394 | char buf[PBUFSIZ]; |
72bba93b SG |
395 | int nvals; |
396 | CORE_ADDR text_addr, data_addr, bss_addr; | |
397 | struct section_offsets *offs; | |
398 | ||
399 | putpkt ("qOffsets"); | |
400 | ||
1c95d7ab | 401 | getpkt (buf, 0); |
72bba93b | 402 | |
1c95d7ab JK |
403 | if (buf[0] == '\000') |
404 | return; /* Return silently. Stub doesn't support this | |
405 | command. */ | |
72bba93b SG |
406 | if (buf[0] == 'E') |
407 | { | |
408 | warning ("Remote failure reply: %s", buf); | |
409 | return; | |
410 | } | |
411 | ||
412 | nvals = sscanf (buf, "Text=%lx;Data=%lx;Bss=%lx", &text_addr, &data_addr, | |
413 | &bss_addr); | |
414 | if (nvals != 3) | |
415 | error ("Malformed response to offset query, %s", buf); | |
416 | ||
417 | if (symfile_objfile == NULL) | |
418 | return; | |
419 | ||
420 | offs = (struct section_offsets *) alloca (sizeof (struct section_offsets) | |
421 | + symfile_objfile->num_sections | |
422 | * sizeof (offs->offsets)); | |
423 | memcpy (offs, symfile_objfile->section_offsets, | |
424 | sizeof (struct section_offsets) | |
425 | + symfile_objfile->num_sections | |
426 | * sizeof (offs->offsets)); | |
427 | ||
428 | ANOFFSET (offs, SECT_OFF_TEXT) = text_addr; | |
1624c38f SG |
429 | |
430 | /* This is a temporary kludge to force data and bss to use the same offsets | |
431 | because that's what nlmconv does now. The real solution requires changes | |
432 | to the stub and remote.c that I don't have time to do right now. */ | |
433 | ||
72bba93b | 434 | ANOFFSET (offs, SECT_OFF_DATA) = data_addr; |
1624c38f | 435 | ANOFFSET (offs, SECT_OFF_BSS) = data_addr; |
72bba93b SG |
436 | |
437 | objfile_relocate (symfile_objfile, offs); | |
438 | } | |
439 | ||
7c622b41 JG |
440 | /* Stub for catch_errors. */ |
441 | ||
442 | static int | |
443 | remote_start_remote (dummy) | |
444 | char *dummy; | |
445 | { | |
ac7a377f JK |
446 | immediate_quit = 1; /* Allow user to interrupt it */ |
447 | ||
7c622b41 | 448 | /* Ack any packet which the remote side has already sent. */ |
72bba93b SG |
449 | SERIAL_WRITE (remote_desc, "+", 1); |
450 | ||
4cc1b3f7 JK |
451 | /* Let the stub know that we want it to return the thread. */ |
452 | set_thread (-1, 0); | |
453 | ||
72bba93b SG |
454 | get_offsets (); /* Get text, data & bss offsets */ |
455 | ||
7c622b41 | 456 | putpkt ("?"); /* initiate a query from remote machine */ |
ac7a377f | 457 | immediate_quit = 0; |
7c622b41 JG |
458 | |
459 | start_remote (); /* Initialize gdb process mechanisms */ | |
460 | return 1; | |
461 | } | |
462 | ||
bd5635a1 RP |
463 | /* Open a connection to a remote debugger. |
464 | NAME is the filename used for communication. */ | |
465 | ||
2b576293 C |
466 | static void |
467 | remote_open (name, from_tty) | |
468 | char *name; | |
469 | int from_tty; | |
470 | { | |
471 | remote_open_1 (name, from_tty, &remote_ops); | |
472 | } | |
473 | ||
474 | /* Open a connection to a remote debugger using the extended | |
475 | remote gdb protocol. NAME is hte filename used for communication. */ | |
476 | ||
477 | static void | |
478 | extended_remote_open (name, from_tty) | |
479 | char *name; | |
480 | int from_tty; | |
481 | { | |
482 | char buf[PBUFSIZ]; | |
483 | ||
484 | /* Do the basic remote open stuff. */ | |
485 | remote_open_1 (name, from_tty, &extended_remote_ops); | |
486 | ||
487 | /* Now tell the remote that we're using the extended protocol. */ | |
488 | putpkt ("!"); | |
489 | getpkt (buf, 0); | |
490 | ||
491 | } | |
492 | ||
493 | /* Generic code for opening a connection to a remote target. */ | |
d538b510 RP |
494 | static DCACHE *remote_dcache; |
495 | ||
b543979c | 496 | static void |
2b576293 | 497 | remote_open_1 (name, from_tty, target) |
bd5635a1 RP |
498 | char *name; |
499 | int from_tty; | |
2b576293 | 500 | struct target_ops *target; |
bd5635a1 | 501 | { |
bd5635a1 | 502 | if (name == 0) |
45993f61 | 503 | error ("To open a remote debug connection, you need to specify what serial\n\ |
bd5635a1 RP |
504 | device is attached to the remote system (e.g. /dev/ttya)."); |
505 | ||
f2fc6e7a JK |
506 | target_preopen (from_tty); |
507 | ||
2b576293 | 508 | unpush_target (target); |
bd5635a1 | 509 | |
d538b510 | 510 | remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes); |
bd5635a1 | 511 | |
ebdb9ade JK |
512 | remote_desc = SERIAL_OPEN (name); |
513 | if (!remote_desc) | |
bd5635a1 RP |
514 | perror_with_name (name); |
515 | ||
94d4b713 | 516 | if (baud_rate != -1) |
b543979c | 517 | { |
94d4b713 JK |
518 | if (SERIAL_SETBAUDRATE (remote_desc, baud_rate)) |
519 | { | |
520 | SERIAL_CLOSE (remote_desc); | |
521 | perror_with_name (name); | |
522 | } | |
b543979c | 523 | } |
ebdb9ade | 524 | |
45993f61 | 525 | |
ebdb9ade | 526 | SERIAL_RAW (remote_desc); |
bd5635a1 | 527 | |
e15f2a54 JK |
528 | /* If there is something sitting in the buffer we might take it as a |
529 | response to a command, which would be bad. */ | |
530 | SERIAL_FLUSH_INPUT (remote_desc); | |
531 | ||
bd5635a1 | 532 | if (from_tty) |
7c622b41 JG |
533 | { |
534 | puts_filtered ("Remote debugging using "); | |
535 | puts_filtered (name); | |
536 | puts_filtered ("\n"); | |
537 | } | |
2b576293 | 538 | push_target (target); /* Switch to using remote target now */ |
bd5635a1 | 539 | |
4aa6fe10 JK |
540 | /* Start out by trying the 'P' request to set registers. We set this each |
541 | time that we open a new target so that if the user switches from one | |
542 | stub to another, we can (if the target is closed and reopened) cope. */ | |
543 | stub_supports_P = 1; | |
544 | ||
4cc1b3f7 JK |
545 | general_thread = -2; |
546 | cont_thread = -2; | |
547 | ||
a1e0ba7a SG |
548 | /* Without this, some commands which require an active target (such as kill) |
549 | won't work. This variable serves (at least) double duty as both the pid | |
550 | of the target process (if it has such), and as a flag indicating that a | |
551 | target is active. These functions should be split out into seperate | |
552 | variables, especially since GDB will someday have a notion of debugging | |
553 | several processes. */ | |
554 | ||
4fb7359d | 555 | inferior_pid = 42000; |
4fb7359d SG |
556 | /* Start the remote connection; if error (0), discard this target. |
557 | In particular, if the user quits, be sure to discard it | |
558 | (we'd be in an inconsistent state otherwise). */ | |
559 | if (!catch_errors (remote_start_remote, (char *)0, | |
45993f61 | 560 | "Couldn't establish connection to remote target\n", RETURN_MASK_ALL)) |
4fb7359d | 561 | pop_target(); |
bd5635a1 RP |
562 | } |
563 | ||
564 | /* remote_detach() | |
565 | takes a program previously attached to and detaches it. | |
566 | We better not have left any breakpoints | |
567 | in the program or it'll die when it hits one. | |
568 | Close the open connection to the remote debugger. | |
569 | Use this when you want to detach and do something else | |
570 | with your gdb. */ | |
571 | ||
572 | static void | |
573 | remote_detach (args, from_tty) | |
574 | char *args; | |
575 | int from_tty; | |
576 | { | |
577 | if (args) | |
578 | error ("Argument given to \"detach\" when remotely debugging."); | |
579 | ||
580 | pop_target (); | |
581 | if (from_tty) | |
7c622b41 | 582 | puts_filtered ("Ending remote debugging.\n"); |
bd5635a1 RP |
583 | } |
584 | ||
585 | /* Convert hex digit A to a number. */ | |
586 | ||
587 | static int | |
588 | fromhex (a) | |
589 | int a; | |
590 | { | |
591 | if (a >= '0' && a <= '9') | |
592 | return a - '0'; | |
593 | else if (a >= 'a' && a <= 'f') | |
594 | return a - 'a' + 10; | |
595 | else | |
6c27841f | 596 | error ("Reply contains invalid hex digit %d", a); |
bd5635a1 RP |
597 | } |
598 | ||
599 | /* Convert number NIB to a hex digit. */ | |
600 | ||
601 | static int | |
602 | tohex (nib) | |
603 | int nib; | |
604 | { | |
605 | if (nib < 10) | |
606 | return '0'+nib; | |
607 | else | |
608 | return 'a'+nib-10; | |
609 | } | |
610 | \f | |
611 | /* Tell the remote machine to resume. */ | |
612 | ||
4cc1b3f7 JK |
613 | static enum target_signal last_sent_signal = TARGET_SIGNAL_0; |
614 | int last_sent_step; | |
615 | ||
b543979c | 616 | static void |
d538b510 | 617 | remote_resume (pid, step, siggnal) |
94d4b713 JK |
618 | int pid, step; |
619 | enum target_signal siggnal; | |
bd5635a1 RP |
620 | { |
621 | char buf[PBUFSIZ]; | |
622 | ||
4cc1b3f7 JK |
623 | if (pid == -1) |
624 | set_thread (inferior_pid, 0); | |
625 | else | |
626 | set_thread (pid, 0); | |
bd5635a1 | 627 | |
d538b510 | 628 | dcache_flush (remote_dcache); |
bd5635a1 | 629 | |
4cc1b3f7 JK |
630 | last_sent_signal = siggnal; |
631 | last_sent_step = step; | |
632 | ||
633 | if (siggnal != TARGET_SIGNAL_0) | |
634 | { | |
635 | buf[0] = step ? 'S' : 'C'; | |
636 | buf[1] = tohex (((int)siggnal >> 4) & 0xf); | |
637 | buf[2] = tohex ((int)siggnal & 0xf); | |
638 | buf[3] = '\0'; | |
639 | } | |
640 | else | |
641 | strcpy (buf, step ? "s": "c"); | |
bd5635a1 RP |
642 | |
643 | putpkt (buf); | |
644 | } | |
ebdb9ade | 645 | \f |
b543979c JG |
646 | /* Send ^C to target to halt it. Target will respond, and send us a |
647 | packet. */ | |
648 | ||
5af4f5f6 JK |
649 | static void |
650 | remote_interrupt (signo) | |
e676a15f | 651 | int signo; |
b543979c | 652 | { |
ebdb9ade JK |
653 | /* If this doesn't work, try more severe steps. */ |
654 | signal (signo, remote_interrupt_twice); | |
8f86a4e4 | 655 | |
d0d8484a | 656 | if (remote_debug) |
199b2450 | 657 | printf_unfiltered ("remote_interrupt called\n"); |
8f86a4e4 | 658 | |
ebdb9ade | 659 | SERIAL_WRITE (remote_desc, "\003", 1); /* Send a ^C */ |
b543979c JG |
660 | } |
661 | ||
5af4f5f6 JK |
662 | static void (*ofunc)(); |
663 | ||
ebdb9ade JK |
664 | /* The user typed ^C twice. */ |
665 | static void | |
666 | remote_interrupt_twice (signo) | |
667 | int signo; | |
668 | { | |
669 | signal (signo, ofunc); | |
670 | ||
981a3309 SG |
671 | interrupt_query (); |
672 | ||
673 | signal (signo, remote_interrupt); | |
674 | } | |
675 | ||
676 | /* Ask the user what to do when an interrupt is received. */ | |
677 | ||
678 | static void | |
679 | interrupt_query () | |
680 | { | |
ebdb9ade | 681 | target_terminal_ours (); |
981a3309 | 682 | |
6b27ebe8 | 683 | if (query ("Interrupted while waiting for the program.\n\ |
ebdb9ade JK |
684 | Give up (and stop debugging it)? ")) |
685 | { | |
686 | target_mourn_inferior (); | |
e50ebec8 | 687 | return_to_top_level (RETURN_QUIT); |
ebdb9ade | 688 | } |
981a3309 SG |
689 | |
690 | target_terminal_inferior (); | |
ebdb9ade | 691 | } |
b543979c | 692 | |
4cc1b3f7 JK |
693 | /* If nonzero, ignore the next kill. */ |
694 | int kill_kludge; | |
695 | ||
bd5635a1 | 696 | /* Wait until the remote machine stops, then return, |
e1ce8aa5 JK |
697 | storing status in STATUS just as `wait' would. |
698 | Returns "pid" (though it's not clear what, if anything, that | |
699 | means in the case of this target). */ | |
bd5635a1 | 700 | |
b543979c | 701 | static int |
d0d8484a SG |
702 | remote_wait (pid, status) |
703 | int pid; | |
94d4b713 | 704 | struct target_waitstatus *status; |
bd5635a1 RP |
705 | { |
706 | unsigned char buf[PBUFSIZ]; | |
4cc1b3f7 | 707 | int thread_num = -1; |
8f86a4e4 | 708 | |
94d4b713 JK |
709 | status->kind = TARGET_WAITKIND_EXITED; |
710 | status->value.integer = 0; | |
b543979c | 711 | |
4f8a48e5 | 712 | while (1) |
8f86a4e4 | 713 | { |
4f8a48e5 | 714 | unsigned char *p; |
a03d4f8e | 715 | |
4f8a48e5 ILT |
716 | ofunc = (void (*)()) signal (SIGINT, remote_interrupt); |
717 | getpkt ((char *) buf, 1); | |
718 | signal (SIGINT, ofunc); | |
4ecee2f9 | 719 | |
754e5da2 | 720 | switch (buf[0]) |
8f86a4e4 | 721 | { |
754e5da2 SG |
722 | case 'E': /* Error of some sort */ |
723 | warning ("Remote failure reply: %s", buf); | |
724 | continue; | |
725 | case 'T': /* Status with PC, SP, FP, ... */ | |
726 | { | |
727 | int i; | |
728 | long regno; | |
729 | char regs[MAX_REGISTER_RAW_SIZE]; | |
a03d4f8e | 730 | |
754e5da2 SG |
731 | /* Expedited reply, containing Signal, {regno, reg} repeat */ |
732 | /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where | |
733 | ss = signal number | |
734 | n... = register number | |
735 | r... = register contents | |
736 | */ | |
5af4f5f6 | 737 | |
754e5da2 | 738 | p = &buf[3]; /* after Txx */ |
5af4f5f6 | 739 | |
754e5da2 SG |
740 | while (*p) |
741 | { | |
742 | unsigned char *p1; | |
45993f61 | 743 | char *p_temp; |
2b576293 | 744 | unsigned LONGEST val; |
5af4f5f6 | 745 | |
2b576293 | 746 | regno = strtol ((const char *) p, &p_temp, 16); /* Read the register number */ |
45993f61 | 747 | p1 = (unsigned char *)p_temp; |
5af4f5f6 | 748 | |
754e5da2 | 749 | if (p1 == p) |
754e5da2 | 750 | { |
2b576293 | 751 | p1 = (unsigned char *) strchr ((const char *) p, ':'); |
4cc1b3f7 JK |
752 | if (p1 == NULL) |
753 | warning ("Malformed packet (missing colon): %s\n\ | |
754 | Packet: '%s'\n", | |
755 | p, buf); | |
2b576293 | 756 | if (strncmp ((const char *) p, "thread", p1 - p) == 0) |
4cc1b3f7 | 757 | { |
2b576293 | 758 | thread_num = strtol ((const char *) ++p1, &p_temp, 16); |
45993f61 | 759 | p = (unsigned char *)p_temp; |
4cc1b3f7 JK |
760 | } |
761 | } | |
762 | else | |
763 | { | |
764 | p = p1; | |
765 | ||
766 | if (*p++ != ':') | |
767 | warning ("Malformed packet (missing colon): %s\n\ | |
768 | Packet: '%s'\n", | |
769 | p, buf); | |
770 | ||
771 | if (regno >= NUM_REGS) | |
2b576293 | 772 | warning ("Remote sent bad register number %ld: %s\n\ |
4cc1b3f7 JK |
773 | Packet: '%s'\n", |
774 | regno, p, buf); | |
775 | ||
2b576293 | 776 | val = 0L; |
4cc1b3f7 JK |
777 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i++) |
778 | { | |
779 | if (p[0] == 0 || p[1] == 0) | |
780 | warning ("Remote reply is too short: %s", buf); | |
2b576293 | 781 | val = val * 256 + fromhex (p[0]) * 16 + fromhex (p[1]); |
4cc1b3f7 | 782 | p += 2; |
2b576293 | 783 | |
4cc1b3f7 | 784 | } |
2b576293 | 785 | store_unsigned_integer (regs, REGISTER_RAW_SIZE (regno), val); |
4cc1b3f7 | 786 | supply_register (regno, regs); |
754e5da2 | 787 | } |
4f8a48e5 | 788 | |
754e5da2 SG |
789 | if (*p++ != ';') |
790 | warning ("Remote register badly formatted: %s", buf); | |
754e5da2 SG |
791 | } |
792 | } | |
793 | /* fall through */ | |
794 | case 'S': /* Old style status, just signal only */ | |
795 | status->kind = TARGET_WAITKIND_STOPPED; | |
796 | status->value.sig = (enum target_signal) | |
797 | (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); | |
4f8a48e5 | 798 | |
4cc1b3f7 | 799 | goto got_status; |
754e5da2 SG |
800 | case 'W': /* Target exited */ |
801 | { | |
802 | /* The remote process exited. */ | |
803 | status->kind = TARGET_WAITKIND_EXITED; | |
804 | status->value.integer = (fromhex (buf[1]) << 4) + fromhex (buf[2]); | |
4cc1b3f7 | 805 | goto got_status; |
754e5da2 | 806 | } |
4cc1b3f7 JK |
807 | case 'X': |
808 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
809 | status->value.sig = (enum target_signal) | |
810 | (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); | |
811 | kill_kludge = 1; | |
812 | ||
813 | goto got_status; | |
754e5da2 | 814 | case 'O': /* Console output */ |
6c27841f | 815 | fputs_filtered ((char *)(buf + 1), gdb_stdout); |
754e5da2 | 816 | continue; |
4cc1b3f7 JK |
817 | case '\0': |
818 | if (last_sent_signal != TARGET_SIGNAL_0) | |
819 | { | |
820 | /* Zero length reply means that we tried 'S' or 'C' and | |
821 | the remote system doesn't support it. */ | |
822 | target_terminal_ours_for_output (); | |
823 | printf_filtered | |
824 | ("Can't send signals to this remote system. %s not sent.\n", | |
825 | target_signal_to_name (last_sent_signal)); | |
826 | last_sent_signal = TARGET_SIGNAL_0; | |
827 | target_terminal_inferior (); | |
828 | ||
2b576293 C |
829 | strcpy ((char *) buf, last_sent_step ? "s" : "c"); |
830 | putpkt ((char *) buf); | |
4cc1b3f7 JK |
831 | continue; |
832 | } | |
833 | /* else fallthrough */ | |
754e5da2 SG |
834 | default: |
835 | warning ("Invalid remote reply: %s", buf); | |
836 | continue; | |
4f8a48e5 | 837 | } |
758aeb93 | 838 | } |
4cc1b3f7 JK |
839 | got_status: |
840 | if (thread_num != -1) | |
841 | { | |
842 | /* Initial thread value can only be acquired via wait, so deal with | |
843 | this marker which is used before the first thread value is | |
844 | acquired. */ | |
845 | if (inferior_pid == 42000) | |
846 | { | |
847 | inferior_pid = thread_num; | |
848 | add_thread (inferior_pid); | |
849 | } | |
850 | return thread_num; | |
851 | } | |
852 | return inferior_pid; | |
bd5635a1 RP |
853 | } |
854 | ||
55fea07b JK |
855 | /* Number of bytes of registers this stub implements. */ |
856 | static int register_bytes_found; | |
857 | ||
bd5635a1 | 858 | /* Read the remote registers into the block REGS. */ |
e1ce8aa5 JK |
859 | /* Currently we just read all the registers, so we don't use regno. */ |
860 | /* ARGSUSED */ | |
b543979c | 861 | static void |
bd5635a1 RP |
862 | remote_fetch_registers (regno) |
863 | int regno; | |
864 | { | |
865 | char buf[PBUFSIZ]; | |
866 | int i; | |
867 | char *p; | |
868 | char regs[REGISTER_BYTES]; | |
869 | ||
4cc1b3f7 JK |
870 | set_thread (inferior_pid, 1); |
871 | ||
bd5635a1 RP |
872 | sprintf (buf, "g"); |
873 | remote_send (buf); | |
874 | ||
55fea07b JK |
875 | /* Unimplemented registers read as all bits zero. */ |
876 | memset (regs, 0, REGISTER_BYTES); | |
877 | ||
981a3309 SG |
878 | /* We can get out of synch in various cases. If the first character |
879 | in the buffer is not a hex character, assume that has happened | |
880 | and try to fetch another packet to read. */ | |
881 | while ((buf[0] < '0' || buf[0] > '9') | |
882 | && (buf[0] < 'a' || buf[0] > 'f')) | |
883 | { | |
d0d8484a | 884 | if (remote_debug) |
199b2450 | 885 | printf_unfiltered ("Bad register packet; fetching a new packet\n"); |
981a3309 SG |
886 | getpkt (buf, 0); |
887 | } | |
888 | ||
bd5635a1 RP |
889 | /* Reply describes registers byte by byte, each byte encoded as two |
890 | hex characters. Suck them all up, then supply them to the | |
891 | register cacheing/storage mechanism. */ | |
892 | ||
893 | p = buf; | |
894 | for (i = 0; i < REGISTER_BYTES; i++) | |
895 | { | |
55fea07b JK |
896 | if (p[0] == 0) |
897 | break; | |
898 | if (p[1] == 0) | |
899 | { | |
900 | warning ("Remote reply is of odd length: %s", buf); | |
901 | /* Don't change register_bytes_found in this case, and don't | |
902 | print a second warning. */ | |
903 | goto supply_them; | |
904 | } | |
bd5635a1 RP |
905 | regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); |
906 | p += 2; | |
907 | } | |
55fea07b JK |
908 | |
909 | if (i != register_bytes_found) | |
910 | { | |
911 | register_bytes_found = i; | |
912 | #ifdef REGISTER_BYTES_OK | |
913 | if (!REGISTER_BYTES_OK (i)) | |
914 | warning ("Remote reply is too short: %s", buf); | |
915 | #endif | |
916 | } | |
917 | ||
918 | supply_them: | |
bd5635a1 RP |
919 | for (i = 0; i < NUM_REGS; i++) |
920 | supply_register (i, ®s[REGISTER_BYTE(i)]); | |
bd5635a1 RP |
921 | } |
922 | ||
4aa6fe10 JK |
923 | /* Prepare to store registers. Since we may send them all (using a |
924 | 'G' request), we have to read out the ones we don't want to change | |
925 | first. */ | |
bd5635a1 | 926 | |
b543979c | 927 | static void |
bd5635a1 RP |
928 | remote_prepare_to_store () |
929 | { | |
34517ebc JG |
930 | /* Make sure the entire registers array is valid. */ |
931 | read_register_bytes (0, (char *)NULL, REGISTER_BYTES); | |
bd5635a1 RP |
932 | } |
933 | ||
4aa6fe10 JK |
934 | /* Store register REGNO, or all registers if REGNO == -1, from the contents |
935 | of REGISTERS. FIXME: ignores errors. */ | |
bd5635a1 | 936 | |
b543979c | 937 | static void |
bd5635a1 RP |
938 | remote_store_registers (regno) |
939 | int regno; | |
940 | { | |
941 | char buf[PBUFSIZ]; | |
942 | int i; | |
943 | char *p; | |
944 | ||
4cc1b3f7 JK |
945 | set_thread (inferior_pid, 1); |
946 | ||
4aa6fe10 JK |
947 | if (regno >= 0 && stub_supports_P) |
948 | { | |
949 | /* Try storing a single register. */ | |
950 | char *regp; | |
951 | ||
0c993550 | 952 | sprintf (buf, "P%x=", regno); |
4aa6fe10 JK |
953 | p = buf + strlen (buf); |
954 | regp = ®isters[REGISTER_BYTE (regno)]; | |
955 | for (i = 0; i < REGISTER_RAW_SIZE (regno); ++i) | |
956 | { | |
957 | *p++ = tohex ((regp[i] >> 4) & 0xf); | |
958 | *p++ = tohex (regp[i] & 0xf); | |
959 | } | |
960 | *p = '\0'; | |
961 | remote_send (buf); | |
962 | if (buf[0] != '\0') | |
963 | { | |
964 | /* The stub understands the 'P' request. We are done. */ | |
965 | return; | |
966 | } | |
967 | ||
968 | /* The stub does not support the 'P' request. Use 'G' instead, | |
969 | and don't try using 'P' in the future (it will just waste our | |
970 | time). */ | |
971 | stub_supports_P = 0; | |
972 | } | |
973 | ||
bd5635a1 | 974 | buf[0] = 'G'; |
4aa6fe10 | 975 | |
bd5635a1 RP |
976 | /* Command describes registers byte by byte, |
977 | each byte encoded as two hex characters. */ | |
978 | ||
979 | p = buf + 1; | |
55fea07b JK |
980 | /* remote_prepare_to_store insures that register_bytes_found gets set. */ |
981 | for (i = 0; i < register_bytes_found; i++) | |
bd5635a1 RP |
982 | { |
983 | *p++ = tohex ((registers[i] >> 4) & 0xf); | |
984 | *p++ = tohex (registers[i] & 0xf); | |
985 | } | |
986 | *p = '\0'; | |
987 | ||
988 | remote_send (buf); | |
bd5635a1 RP |
989 | } |
990 | ||
45993f61 SC |
991 | /* |
992 | Use of the data cache *used* to be disabled because it loses for looking at | |
b43e0347 | 993 | and changing hardware I/O ports and the like. Accepting `volatile' |
45993f61 SC |
994 | would perhaps be one way to fix it. Another idea would be to use the |
995 | executable file for the text segment (for all SEC_CODE sections? | |
996 | For all SEC_READONLY sections?). This has problems if you want to | |
997 | actually see what the memory contains (e.g. self-modifying code, | |
998 | clobbered memory, user downloaded the wrong thing). | |
999 | ||
1000 | Because it speeds so much up, it's now enabled, if you're playing | |
1001 | with registers you turn it of (set remotecache 0) | |
1002 | */ | |
b43e0347 | 1003 | |
bd5635a1 RP |
1004 | /* Read a word from remote address ADDR and return it. |
1005 | This goes through the data cache. */ | |
1006 | ||
2b576293 | 1007 | #if 0 /* unused? */ |
b43e0347 | 1008 | static int |
bd5635a1 RP |
1009 | remote_fetch_word (addr) |
1010 | CORE_ADDR addr; | |
1011 | { | |
d538b510 | 1012 | return dcache_fetch (remote_dcache, addr); |
bd5635a1 RP |
1013 | } |
1014 | ||
1015 | /* Write a word WORD into remote address ADDR. | |
1016 | This goes through the data cache. */ | |
1017 | ||
b43e0347 | 1018 | static void |
bd5635a1 RP |
1019 | remote_store_word (addr, word) |
1020 | CORE_ADDR addr; | |
1021 | int word; | |
1022 | { | |
d538b510 | 1023 | dcache_poke (remote_dcache, addr, word); |
bd5635a1 | 1024 | } |
2b576293 | 1025 | #endif /* 0 (unused?) */ |
45993f61 | 1026 | |
bd5635a1 RP |
1027 | \f |
1028 | /* Write memory data directly to the remote machine. | |
1029 | This does not inform the data cache; the data cache uses this. | |
1030 | MEMADDR is the address in the remote memory space. | |
1031 | MYADDR is the address of the buffer in our space. | |
d538b510 | 1032 | LEN is the number of bytes. |
bd5635a1 | 1033 | |
d538b510 RP |
1034 | Returns number of bytes transferred, or 0 for error. */ |
1035 | ||
1036 | static int | |
bd5635a1 RP |
1037 | remote_write_bytes (memaddr, myaddr, len) |
1038 | CORE_ADDR memaddr; | |
43fc25c8 | 1039 | char *myaddr; |
bd5635a1 RP |
1040 | int len; |
1041 | { | |
1042 | char buf[PBUFSIZ]; | |
1043 | int i; | |
1044 | char *p; | |
1045 | ||
d24c0599 JK |
1046 | /* FIXME-32x64: Need a version of print_address_numeric which puts the |
1047 | result in a buffer like sprintf. */ | |
4aa6fe10 | 1048 | sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, len); |
bd5635a1 | 1049 | |
b543979c | 1050 | /* We send target system values byte by byte, in increasing byte addresses, |
bd5635a1 RP |
1051 | each byte encoded as two hex characters. */ |
1052 | ||
1053 | p = buf + strlen (buf); | |
1054 | for (i = 0; i < len; i++) | |
1055 | { | |
1056 | *p++ = tohex ((myaddr[i] >> 4) & 0xf); | |
1057 | *p++ = tohex (myaddr[i] & 0xf); | |
1058 | } | |
1059 | *p = '\0'; | |
1060 | ||
d538b510 RP |
1061 | putpkt (buf); |
1062 | getpkt (buf, 0); | |
1063 | ||
1064 | if (buf[0] == 'E') | |
1065 | { | |
1066 | /* There is no correspondance between what the remote protocol uses | |
1067 | for errors and errno codes. We would like a cleaner way of | |
1068 | representing errors (big enough to include errno codes, bfd_error | |
1069 | codes, and others). But for now just return EIO. */ | |
1070 | errno = EIO; | |
1071 | return 0; | |
1072 | } | |
1073 | return len; | |
bd5635a1 RP |
1074 | } |
1075 | ||
1076 | /* Read memory data directly from the remote machine. | |
1077 | This does not use the data cache; the data cache uses this. | |
1078 | MEMADDR is the address in the remote memory space. | |
1079 | MYADDR is the address of the buffer in our space. | |
d538b510 | 1080 | LEN is the number of bytes. |
bd5635a1 | 1081 | |
d538b510 RP |
1082 | Returns number of bytes transferred, or 0 for error. */ |
1083 | ||
1084 | static int | |
bd5635a1 RP |
1085 | remote_read_bytes (memaddr, myaddr, len) |
1086 | CORE_ADDR memaddr; | |
43fc25c8 | 1087 | char *myaddr; |
bd5635a1 RP |
1088 | int len; |
1089 | { | |
1090 | char buf[PBUFSIZ]; | |
1091 | int i; | |
1092 | char *p; | |
1093 | ||
1094 | if (len > PBUFSIZ / 2 - 1) | |
1095 | abort (); | |
1096 | ||
d24c0599 JK |
1097 | /* FIXME-32x64: Need a version of print_address_numeric which puts the |
1098 | result in a buffer like sprintf. */ | |
4aa6fe10 | 1099 | sprintf (buf, "m%lx,%x", (unsigned long) memaddr, len); |
d538b510 RP |
1100 | putpkt (buf); |
1101 | getpkt (buf, 0); | |
1102 | ||
1103 | if (buf[0] == 'E') | |
1104 | { | |
1105 | /* There is no correspondance between what the remote protocol uses | |
1106 | for errors and errno codes. We would like a cleaner way of | |
1107 | representing errors (big enough to include errno codes, bfd_error | |
1108 | codes, and others). But for now just return EIO. */ | |
1109 | errno = EIO; | |
1110 | return 0; | |
1111 | } | |
bd5635a1 | 1112 | |
b543979c | 1113 | /* Reply describes memory byte by byte, |
bd5635a1 RP |
1114 | each byte encoded as two hex characters. */ |
1115 | ||
1116 | p = buf; | |
1117 | for (i = 0; i < len; i++) | |
1118 | { | |
1119 | if (p[0] == 0 || p[1] == 0) | |
d538b510 RP |
1120 | /* Reply is short. This means that we were able to read only part |
1121 | of what we wanted to. */ | |
1122 | break; | |
bd5635a1 RP |
1123 | myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]); |
1124 | p += 2; | |
1125 | } | |
d538b510 | 1126 | return i; |
bd5635a1 RP |
1127 | } |
1128 | \f | |
1129 | /* Read or write LEN bytes from inferior memory at MEMADDR, transferring | |
e1ce8aa5 | 1130 | to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is |
bd5635a1 RP |
1131 | nonzero. Returns length of data written or read; 0 for error. */ |
1132 | ||
b543979c JG |
1133 | /* ARGSUSED */ |
1134 | static int | |
1135 | remote_xfer_memory(memaddr, myaddr, len, should_write, target) | |
bd5635a1 RP |
1136 | CORE_ADDR memaddr; |
1137 | char *myaddr; | |
1138 | int len; | |
e1ce8aa5 | 1139 | int should_write; |
b543979c | 1140 | struct target_ops *target; /* ignored */ |
bd5635a1 | 1141 | { |
45993f61 | 1142 | return dcache_xfer_memory (remote_dcache, memaddr, myaddr, len, should_write); |
bd5635a1 RP |
1143 | } |
1144 | ||
45993f61 | 1145 | |
94d4b713 JK |
1146 | #if 0 |
1147 | /* Enable after 4.12. */ | |
1148 | ||
1149 | void | |
1150 | remote_search (len, data, mask, startaddr, increment, lorange, hirange | |
1151 | addr_found, data_found) | |
1152 | int len; | |
1153 | char *data; | |
1154 | char *mask; | |
1155 | CORE_ADDR startaddr; | |
1156 | int increment; | |
1157 | CORE_ADDR lorange; | |
1158 | CORE_ADDR hirange; | |
1159 | CORE_ADDR *addr_found; | |
1160 | char *data_found; | |
1161 | { | |
1162 | if (increment == -4 && len == 4) | |
1163 | { | |
1164 | long mask_long, data_long; | |
1165 | long data_found_long; | |
1166 | CORE_ADDR addr_we_found; | |
1167 | char buf[PBUFSIZ]; | |
1168 | long returned_long[2]; | |
1169 | char *p; | |
1170 | ||
1171 | mask_long = extract_unsigned_integer (mask, len); | |
1172 | data_long = extract_unsigned_integer (data, len); | |
1173 | sprintf (buf, "t%x:%x,%x", startaddr, data_long, mask_long); | |
1174 | putpkt (buf); | |
1175 | getpkt (buf, 0); | |
1176 | if (buf[0] == '\0') | |
1177 | { | |
1178 | /* The stub doesn't support the 't' request. We might want to | |
1179 | remember this fact, but on the other hand the stub could be | |
1180 | switched on us. Maybe we should remember it only until | |
1181 | the next "target remote". */ | |
1182 | generic_search (len, data, mask, startaddr, increment, lorange, | |
1183 | hirange, addr_found, data_found); | |
1184 | return; | |
1185 | } | |
1186 | ||
1187 | if (buf[0] == 'E') | |
1188 | /* There is no correspondance between what the remote protocol uses | |
1189 | for errors and errno codes. We would like a cleaner way of | |
1190 | representing errors (big enough to include errno codes, bfd_error | |
1191 | codes, and others). But for now just use EIO. */ | |
1192 | memory_error (EIO, startaddr); | |
1193 | p = buf; | |
1194 | addr_we_found = 0; | |
1195 | while (*p != '\0' && *p != ',') | |
1196 | addr_we_found = (addr_we_found << 4) + fromhex (*p++); | |
1197 | if (*p == '\0') | |
1198 | error ("Protocol error: short return for search"); | |
1199 | ||
1200 | data_found_long = 0; | |
1201 | while (*p != '\0' && *p != ',') | |
1202 | data_found_long = (data_found_long << 4) + fromhex (*p++); | |
1203 | /* Ignore anything after this comma, for future extensions. */ | |
1204 | ||
1205 | if (addr_we_found < lorange || addr_we_found >= hirange) | |
1206 | { | |
1207 | *addr_found = 0; | |
1208 | return; | |
1209 | } | |
1210 | ||
1211 | *addr_found = addr_we_found; | |
1212 | *data_found = store_unsigned_integer (data_we_found, len); | |
1213 | return; | |
1214 | } | |
1215 | generic_search (len, data, mask, startaddr, increment, lorange, | |
1216 | hirange, addr_found, data_found); | |
1217 | } | |
1218 | #endif /* 0 */ | |
1219 | \f | |
b543979c | 1220 | static void |
8f86a4e4 | 1221 | remote_files_info (ignore) |
5af4f5f6 | 1222 | struct target_ops *ignore; |
bd5635a1 | 1223 | { |
7c622b41 | 1224 | puts_filtered ("Debugging a target over a serial line.\n"); |
bd5635a1 RP |
1225 | } |
1226 | \f | |
e50ebec8 JK |
1227 | /* Stuff for dealing with the packets which are part of this protocol. |
1228 | See comment at top of file for details. */ | |
bd5635a1 | 1229 | |
ebdb9ade | 1230 | /* Read a single character from the remote end, masking it down to 7 bits. */ |
b543979c | 1231 | |
bd5635a1 | 1232 | static int |
754e5da2 SG |
1233 | readchar (timeout) |
1234 | int timeout; | |
bd5635a1 | 1235 | { |
ebdb9ade | 1236 | int ch; |
bd5635a1 | 1237 | |
ebdb9ade | 1238 | ch = SERIAL_READCHAR (remote_desc, timeout); |
fce7f2d9 | 1239 | |
754e5da2 SG |
1240 | switch (ch) |
1241 | { | |
1242 | case SERIAL_EOF: | |
1243 | error ("Remote connection closed"); | |
1244 | case SERIAL_ERROR: | |
1245 | perror_with_name ("Remote communication error"); | |
1246 | case SERIAL_TIMEOUT: | |
1247 | return ch; | |
1248 | default: | |
1249 | return ch & 0x7f; | |
1250 | } | |
bd5635a1 RP |
1251 | } |
1252 | ||
1253 | /* Send the command in BUF to the remote machine, | |
1254 | and read the reply into BUF. | |
1255 | Report an error if we get an error reply. */ | |
1256 | ||
1257 | static void | |
1258 | remote_send (buf) | |
1259 | char *buf; | |
1260 | { | |
bd5635a1 | 1261 | putpkt (buf); |
7c622b41 | 1262 | getpkt (buf, 0); |
bd5635a1 RP |
1263 | |
1264 | if (buf[0] == 'E') | |
1265 | error ("Remote failure reply: %s", buf); | |
1266 | } | |
1267 | ||
1268 | /* Send a packet to the remote machine, with error checking. | |
1269 | The data of the packet is in BUF. */ | |
1270 | ||
4cc1b3f7 | 1271 | static int |
bd5635a1 RP |
1272 | putpkt (buf) |
1273 | char *buf; | |
1274 | { | |
1275 | int i; | |
1276 | unsigned char csum = 0; | |
b543979c | 1277 | char buf2[PBUFSIZ]; |
bd5635a1 | 1278 | int cnt = strlen (buf); |
ebdb9ade | 1279 | int ch; |
45993f61 | 1280 | int tcount = 0; |
bd5635a1 RP |
1281 | char *p; |
1282 | ||
1283 | /* Copy the packet into buffer BUF2, encapsulating it | |
1284 | and giving it a checksum. */ | |
1285 | ||
b543979c JG |
1286 | if (cnt > sizeof(buf2) - 5) /* Prosanity check */ |
1287 | abort(); | |
1288 | ||
bd5635a1 RP |
1289 | p = buf2; |
1290 | *p++ = '$'; | |
1291 | ||
1292 | for (i = 0; i < cnt; i++) | |
1293 | { | |
1294 | csum += buf[i]; | |
1295 | *p++ = buf[i]; | |
1296 | } | |
1297 | *p++ = '#'; | |
1298 | *p++ = tohex ((csum >> 4) & 0xf); | |
1299 | *p++ = tohex (csum & 0xf); | |
1300 | ||
1301 | /* Send it over and over until we get a positive ack. */ | |
1302 | ||
6b27ebe8 JK |
1303 | while (1) |
1304 | { | |
1624c38f SG |
1305 | int started_error_output = 0; |
1306 | ||
d0d8484a | 1307 | if (remote_debug) |
6b27ebe8 JK |
1308 | { |
1309 | *p = '\0'; | |
1624c38f SG |
1310 | printf_unfiltered ("Sending packet: %s...", buf2); |
1311 | gdb_flush(gdb_stdout); | |
6b27ebe8 JK |
1312 | } |
1313 | if (SERIAL_WRITE (remote_desc, buf2, p - buf2)) | |
1314 | perror_with_name ("putpkt: write failed"); | |
1315 | ||
1316 | /* read until either a timeout occurs (-2) or '+' is read */ | |
1317 | while (1) | |
1318 | { | |
754e5da2 | 1319 | ch = readchar (remote_timeout); |
6b27ebe8 | 1320 | |
45993f61 | 1321 | if (remote_debug) |
1624c38f SG |
1322 | { |
1323 | switch (ch) | |
1324 | { | |
1325 | case '+': | |
1326 | case SERIAL_TIMEOUT: | |
1624c38f SG |
1327 | case '$': |
1328 | if (started_error_output) | |
1329 | { | |
45993f61 | 1330 | putchar_unfiltered ('\n'); |
1624c38f SG |
1331 | started_error_output = 0; |
1332 | } | |
1333 | } | |
1334 | } | |
1335 | ||
6b27ebe8 JK |
1336 | switch (ch) |
1337 | { | |
1338 | case '+': | |
d0d8484a | 1339 | if (remote_debug) |
199b2450 | 1340 | printf_unfiltered("Ack\n"); |
4cc1b3f7 | 1341 | return 1; |
6b27ebe8 | 1342 | case SERIAL_TIMEOUT: |
45993f61 SC |
1343 | tcount ++; |
1344 | if (tcount > 3) | |
1345 | return 0; | |
6b27ebe8 | 1346 | break; /* Retransmit buffer */ |
1624c38f SG |
1347 | case '$': |
1348 | { | |
6c27841f | 1349 | char junkbuf[PBUFSIZ]; |
1624c38f SG |
1350 | |
1351 | /* It's probably an old response, and we're out of sync. Just | |
1352 | gobble up the packet and ignore it. */ | |
1353 | getpkt (junkbuf, 0); | |
1354 | continue; /* Now, go look for + */ | |
1355 | } | |
6b27ebe8 | 1356 | default: |
d0d8484a | 1357 | if (remote_debug) |
1624c38f SG |
1358 | { |
1359 | if (!started_error_output) | |
1360 | { | |
1361 | started_error_output = 1; | |
1362 | printf_unfiltered ("putpkt: Junk: "); | |
1363 | } | |
45993f61 | 1364 | putchar_unfiltered (ch & 0177); |
1624c38f | 1365 | } |
6b27ebe8 JK |
1366 | continue; |
1367 | } | |
1368 | break; /* Here to retransmit */ | |
1369 | } | |
981a3309 | 1370 | |
94d4b713 JK |
1371 | #if 0 |
1372 | /* This is wrong. If doing a long backtrace, the user should be | |
1373 | able to get out next time we call QUIT, without anything as violent | |
1374 | as interrupt_query. If we want to provide a way out of here | |
1375 | without getting to the next QUIT, it should be based on hitting | |
1376 | ^C twice as in remote_wait. */ | |
981a3309 SG |
1377 | if (quit_flag) |
1378 | { | |
1379 | quit_flag = 0; | |
1380 | interrupt_query (); | |
1381 | } | |
94d4b713 | 1382 | #endif |
6b27ebe8 | 1383 | } |
bd5635a1 RP |
1384 | } |
1385 | ||
754e5da2 SG |
1386 | /* Come here after finding the start of the frame. Collect the rest into BUF, |
1387 | verifying the checksum, length, and handling run-length compression. | |
1388 | Returns 0 on any error, 1 on success. */ | |
1389 | ||
1390 | static int | |
1391 | read_frame (buf) | |
1392 | char *buf; | |
1393 | { | |
1394 | unsigned char csum; | |
1395 | char *bp; | |
1396 | int c; | |
1397 | ||
1398 | csum = 0; | |
1399 | bp = buf; | |
1400 | ||
1401 | while (1) | |
1402 | { | |
1403 | c = readchar (remote_timeout); | |
1404 | ||
1405 | switch (c) | |
1406 | { | |
1407 | case SERIAL_TIMEOUT: | |
1408 | if (remote_debug) | |
1409 | puts_filtered ("Timeout in mid-packet, retrying\n"); | |
1410 | return 0; | |
1411 | case '$': | |
1412 | if (remote_debug) | |
1413 | puts_filtered ("Saw new packet start in middle of old one\n"); | |
1414 | return 0; /* Start a new packet, count retries */ | |
1415 | case '#': | |
1416 | { | |
1417 | unsigned char pktcsum; | |
1418 | ||
1419 | *bp = '\000'; | |
1420 | ||
205fc02b SC |
1421 | pktcsum = fromhex (readchar (remote_timeout)) << 4; |
1422 | pktcsum |= fromhex (readchar (remote_timeout)); | |
754e5da2 SG |
1423 | |
1424 | if (csum == pktcsum) | |
1425 | return 1; | |
1426 | ||
6c27841f SG |
1427 | if (remote_debug) |
1428 | { | |
1429 | printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=", | |
1430 | pktcsum, csum); | |
1431 | puts_filtered (buf); | |
1432 | puts_filtered ("\n"); | |
1433 | } | |
754e5da2 SG |
1434 | return 0; |
1435 | } | |
1436 | case '*': /* Run length encoding */ | |
284f4ee9 | 1437 | csum += c; |
754e5da2 SG |
1438 | c = readchar (remote_timeout); |
1439 | csum += c; | |
1440 | c = c - ' ' + 3; /* Compute repeat count */ | |
1441 | ||
6c27841f SG |
1442 | |
1443 | if (c > 0 && c < 255 && bp + c - 1 < buf + PBUFSIZ - 1) | |
754e5da2 SG |
1444 | { |
1445 | memset (bp, *(bp - 1), c); | |
1446 | bp += c; | |
1447 | continue; | |
1448 | } | |
1449 | ||
1450 | *bp = '\0'; | |
1451 | printf_filtered ("Repeat count %d too large for buffer: ", c); | |
1452 | puts_filtered (buf); | |
1453 | puts_filtered ("\n"); | |
754e5da2 | 1454 | return 0; |
284f4ee9 | 1455 | |
754e5da2 SG |
1456 | default: |
1457 | if (bp < buf + PBUFSIZ - 1) | |
1458 | { | |
1459 | *bp++ = c; | |
1460 | csum += c; | |
1461 | continue; | |
1462 | } | |
1463 | ||
1464 | *bp = '\0'; | |
1465 | puts_filtered ("Remote packet too long: "); | |
1466 | puts_filtered (buf); | |
1467 | puts_filtered ("\n"); | |
1468 | ||
1469 | return 0; | |
1470 | } | |
1471 | } | |
1472 | } | |
1473 | ||
bd5635a1 | 1474 | /* Read a packet from the remote machine, with error checking, |
7c622b41 JG |
1475 | and store it in BUF. BUF is expected to be of size PBUFSIZ. |
1476 | If FOREVER, wait forever rather than timing out; this is used | |
1477 | while the target is executing user code. */ | |
bd5635a1 RP |
1478 | |
1479 | static void | |
754e5da2 SG |
1480 | getpkt (buf, forever) |
1481 | char *buf; | |
ebdb9ade | 1482 | int forever; |
bd5635a1 | 1483 | { |
754e5da2 SG |
1484 | int c; |
1485 | int tries; | |
1486 | int timeout; | |
1487 | int val; | |
94d4b713 | 1488 | |
45993f61 SC |
1489 | strcpy (buf,"timeout"); |
1490 | ||
754e5da2 | 1491 | if (forever) |
45993f61 SC |
1492 | { |
1493 | #ifdef MAINTENANCE_CMDS | |
1494 | timeout = watchdog > 0 ? watchdog : -1; | |
1495 | #else | |
1496 | timeout = -1; | |
1497 | #endif | |
1498 | } | |
1499 | ||
754e5da2 SG |
1500 | else |
1501 | timeout = remote_timeout; | |
bd5635a1 | 1502 | |
45993f61 | 1503 | #define MAX_TRIES 3 |
981a3309 | 1504 | |
754e5da2 SG |
1505 | for (tries = 1; tries <= MAX_TRIES; tries++) |
1506 | { | |
7c622b41 JG |
1507 | /* This can loop forever if the remote side sends us characters |
1508 | continuously, but if it pauses, we'll get a zero from readchar | |
1509 | because of timeout. Then we'll count that as a retry. */ | |
6b27ebe8 | 1510 | |
754e5da2 SG |
1511 | /* Note that we will only wait forever prior to the start of a packet. |
1512 | After that, we expect characters to arrive at a brisk pace. They | |
1513 | should show up within remote_timeout intervals. */ | |
6b27ebe8 | 1514 | |
754e5da2 | 1515 | do |
6b27ebe8 | 1516 | { |
754e5da2 | 1517 | c = readchar (timeout); |
7c622b41 | 1518 | |
ebdb9ade | 1519 | if (c == SERIAL_TIMEOUT) |
7c622b41 | 1520 | { |
45993f61 SC |
1521 | #ifdef MAINTENANCE_CMDS |
1522 | if (forever) /* Watchdog went off. Kill the target. */ | |
1523 | { | |
1524 | target_mourn_inferior (); | |
1525 | error ("Watchdog has expired. Target detached.\n"); | |
1526 | } | |
1527 | #endif | |
d0d8484a | 1528 | if (remote_debug) |
754e5da2 SG |
1529 | puts_filtered ("Timed out.\n"); |
1530 | goto retry; | |
7c622b41 | 1531 | } |
bd5635a1 | 1532 | } |
754e5da2 | 1533 | while (c != '$'); |
bd5635a1 | 1534 | |
754e5da2 | 1535 | /* We've found the start of a packet, now collect the data. */ |
38094c60 | 1536 | |
754e5da2 SG |
1537 | val = read_frame (buf); |
1538 | ||
1539 | if (val == 1) | |
38094c60 | 1540 | { |
754e5da2 SG |
1541 | if (remote_debug) |
1542 | fprintf_unfiltered (gdb_stderr, "Packet received: %s\n", buf); | |
1543 | SERIAL_WRITE (remote_desc, "+", 1); | |
1544 | return; | |
38094c60 | 1545 | } |
754e5da2 SG |
1546 | |
1547 | /* Try the whole thing again. */ | |
45993f61 | 1548 | retry: |
754e5da2 | 1549 | SERIAL_WRITE (remote_desc, "-", 1); |
bd5635a1 RP |
1550 | } |
1551 | ||
754e5da2 | 1552 | /* We have tried hard enough, and just can't receive the packet. Give up. */ |
7c622b41 | 1553 | |
754e5da2 | 1554 | printf_unfiltered ("Ignoring packet error, continuing...\n"); |
ebdb9ade | 1555 | SERIAL_WRITE (remote_desc, "+", 1); |
bd5635a1 RP |
1556 | } |
1557 | \f | |
ebdb9ade JK |
1558 | static void |
1559 | remote_kill () | |
1560 | { | |
4cc1b3f7 JK |
1561 | /* For some mysterious reason, wait_for_inferior calls kill instead of |
1562 | mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */ | |
1563 | if (kill_kludge) | |
1564 | { | |
1565 | kill_kludge = 0; | |
1566 | target_mourn_inferior (); | |
1567 | return; | |
1568 | } | |
1569 | ||
1570 | /* Use catch_errors so the user can quit from gdb even when we aren't on | |
1571 | speaking terms with the remote system. */ | |
1572 | catch_errors (putpkt, "k", "", RETURN_MASK_ERROR); | |
1573 | ||
ebdb9ade JK |
1574 | /* Don't wait for it to die. I'm not really sure it matters whether |
1575 | we do or not. For the existing stubs, kill is a noop. */ | |
1576 | target_mourn_inferior (); | |
1577 | } | |
bd5635a1 | 1578 | |
ebdb9ade JK |
1579 | static void |
1580 | remote_mourn () | |
1581 | { | |
2b576293 C |
1582 | remote_mourn_1 (&remote_ops); |
1583 | } | |
1584 | ||
1585 | static void | |
1586 | extended_remote_mourn () | |
1587 | { | |
1588 | /* We do _not_ want to mourn the target like this; this will | |
1589 | remove the extended remote target from the target stack, | |
1590 | and the next time the user says "run" it'll fail. | |
1591 | ||
1592 | FIXME: What is the right thing to do here? */ | |
1593 | #if 0 | |
1594 | remote_mourn_1 (&extended_remote_ops); | |
1595 | #endif | |
1596 | } | |
1597 | ||
1598 | /* Worker function for remote_mourn. */ | |
1599 | static void | |
1600 | remote_mourn_1 (target) | |
1601 | struct target_ops *target; | |
1602 | { | |
1603 | unpush_target (target); | |
ebdb9ade JK |
1604 | generic_mourn_inferior (); |
1605 | } | |
2b576293 C |
1606 | |
1607 | /* In the extended protocol we want to be able to do things like | |
1608 | "run" and have them basically work as expected. So we need | |
1609 | a special create_inferior function. | |
1610 | ||
1611 | FIXME: One day add support for changing the exec file | |
1612 | we're debugging, arguments and an environment. */ | |
1613 | ||
1614 | static void | |
1615 | extended_remote_create_inferior (exec_file, args, env) | |
1616 | char *exec_file; | |
1617 | char *args; | |
1618 | char **env; | |
1619 | { | |
1620 | /* Rip out the breakpoints; we'll reinsert them after restarting | |
1621 | the remote server. */ | |
1622 | remove_breakpoints (); | |
1623 | ||
1624 | /* Now restart the remote server. */ | |
1625 | extended_remote_restart (); | |
1626 | ||
1627 | /* Now put the breakpoints back in. This way we're safe if the | |
1628 | restart function works via a unix fork on the remote side. */ | |
1629 | insert_breakpoints (); | |
1630 | ||
1631 | /* Clean up from the last time we were running. */ | |
1632 | clear_proceed_status (); | |
1633 | ||
1634 | /* Let the remote process run. */ | |
1635 | proceed (-1, TARGET_SIGNAL_0, 0); | |
1636 | } | |
1637 | ||
ebdb9ade | 1638 | \f |
5af4f5f6 JK |
1639 | #ifdef REMOTE_BREAKPOINT |
1640 | ||
1641 | /* On some machines, e.g. 68k, we may use a different breakpoint instruction | |
1642 | than other targets. */ | |
1643 | static unsigned char break_insn[] = REMOTE_BREAKPOINT; | |
1644 | ||
5af4f5f6 JK |
1645 | #else /* No REMOTE_BREAKPOINT. */ |
1646 | ||
1647 | /* Same old breakpoint instruction. This code does nothing different | |
1648 | than mem-break.c. */ | |
1649 | static unsigned char break_insn[] = BREAKPOINT; | |
1650 | ||
1651 | #endif /* No REMOTE_BREAKPOINT. */ | |
1652 | ||
1653 | /* Insert a breakpoint on targets that don't have any better breakpoint | |
1654 | support. We read the contents of the target location and stash it, | |
1655 | then overwrite it with a breakpoint instruction. ADDR is the target | |
1656 | location in the target machine. CONTENTS_CACHE is a pointer to | |
1657 | memory allocated for saving the target contents. It is guaranteed | |
1658 | by the caller to be long enough to save sizeof BREAKPOINT bytes (this | |
1659 | is accomplished via BREAKPOINT_MAX). */ | |
1660 | ||
d538b510 | 1661 | static int |
5af4f5f6 JK |
1662 | remote_insert_breakpoint (addr, contents_cache) |
1663 | CORE_ADDR addr; | |
1664 | char *contents_cache; | |
1665 | { | |
1666 | int val; | |
1667 | ||
1668 | val = target_read_memory (addr, contents_cache, sizeof break_insn); | |
1669 | ||
1670 | if (val == 0) | |
1671 | val = target_write_memory (addr, (char *)break_insn, sizeof break_insn); | |
1672 | ||
1673 | return val; | |
1674 | } | |
1675 | ||
d538b510 | 1676 | static int |
5af4f5f6 JK |
1677 | remote_remove_breakpoint (addr, contents_cache) |
1678 | CORE_ADDR addr; | |
1679 | char *contents_cache; | |
1680 | { | |
1681 | return target_write_memory (addr, contents_cache, sizeof break_insn); | |
1682 | } | |
1683 | \f | |
bd5635a1 RP |
1684 | /* Define the target subroutine names */ |
1685 | ||
1686 | struct target_ops remote_ops = { | |
b543979c JG |
1687 | "remote", /* to_shortname */ |
1688 | "Remote serial target in gdb-specific protocol", /* to_longname */ | |
1689 | "Use a remote computer via a serial line, using a gdb-specific protocol.\n\ | |
1690 | Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */ | |
1691 | remote_open, /* to_open */ | |
1692 | remote_close, /* to_close */ | |
1693 | NULL, /* to_attach */ | |
1694 | remote_detach, /* to_detach */ | |
1695 | remote_resume, /* to_resume */ | |
1696 | remote_wait, /* to_wait */ | |
1697 | remote_fetch_registers, /* to_fetch_registers */ | |
1698 | remote_store_registers, /* to_store_registers */ | |
1699 | remote_prepare_to_store, /* to_prepare_to_store */ | |
b543979c JG |
1700 | remote_xfer_memory, /* to_xfer_memory */ |
1701 | remote_files_info, /* to_files_info */ | |
5af4f5f6 JK |
1702 | |
1703 | remote_insert_breakpoint, /* to_insert_breakpoint */ | |
1704 | remote_remove_breakpoint, /* to_remove_breakpoint */ | |
1705 | ||
b543979c JG |
1706 | NULL, /* to_terminal_init */ |
1707 | NULL, /* to_terminal_inferior */ | |
1708 | NULL, /* to_terminal_ours_for_output */ | |
1709 | NULL, /* to_terminal_ours */ | |
1710 | NULL, /* to_terminal_info */ | |
ebdb9ade | 1711 | remote_kill, /* to_kill */ |
6b27ebe8 | 1712 | generic_load, /* to_load */ |
b543979c JG |
1713 | NULL, /* to_lookup_symbol */ |
1714 | NULL, /* to_create_inferior */ | |
ebdb9ade | 1715 | remote_mourn, /* to_mourn_inferior */ |
34517ebc | 1716 | 0, /* to_can_run */ |
7c622b41 | 1717 | 0, /* to_notice_signals */ |
43fc25c8 | 1718 | remote_thread_alive, /* to_thread_alive */ |
6c27841f | 1719 | 0, /* to_stop */ |
b543979c JG |
1720 | process_stratum, /* to_stratum */ |
1721 | NULL, /* to_next */ | |
1722 | 1, /* to_has_all_memory */ | |
1723 | 1, /* to_has_memory */ | |
1724 | 1, /* to_has_stack */ | |
1725 | 1, /* to_has_registers */ | |
1726 | 1, /* to_has_execution */ | |
1727 | NULL, /* sections */ | |
1728 | NULL, /* sections_end */ | |
1729 | OPS_MAGIC /* to_magic */ | |
bd5635a1 RP |
1730 | }; |
1731 | ||
2b576293 C |
1732 | struct target_ops extended_remote_ops = { |
1733 | "extended-remote", /* to_shortname */ | |
1734 | "Extended remote serial target in gdb-specific protocol",/* to_longname */ | |
1735 | "Use a remote computer via a serial line, using a gdb-specific protocol.\n\ | |
1736 | Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */ | |
1737 | extended_remote_open, /* to_open */ | |
1738 | remote_close, /* to_close */ | |
1739 | NULL, /* to_attach */ | |
1740 | remote_detach, /* to_detach */ | |
1741 | remote_resume, /* to_resume */ | |
1742 | remote_wait, /* to_wait */ | |
1743 | remote_fetch_registers, /* to_fetch_registers */ | |
1744 | remote_store_registers, /* to_store_registers */ | |
1745 | remote_prepare_to_store, /* to_prepare_to_store */ | |
1746 | remote_xfer_memory, /* to_xfer_memory */ | |
1747 | remote_files_info, /* to_files_info */ | |
1748 | ||
1749 | remote_insert_breakpoint, /* to_insert_breakpoint */ | |
1750 | remote_remove_breakpoint, /* to_remove_breakpoint */ | |
1751 | ||
1752 | NULL, /* to_terminal_init */ | |
1753 | NULL, /* to_terminal_inferior */ | |
1754 | NULL, /* to_terminal_ours_for_output */ | |
1755 | NULL, /* to_terminal_ours */ | |
1756 | NULL, /* to_terminal_info */ | |
1757 | remote_kill, /* to_kill */ | |
1758 | generic_load, /* to_load */ | |
1759 | NULL, /* to_lookup_symbol */ | |
1760 | extended_remote_create_inferior,/* to_create_inferior */ | |
1761 | extended_remote_mourn, /* to_mourn_inferior */ | |
1762 | 0, /* to_can_run */ | |
1763 | 0, /* to_notice_signals */ | |
1764 | remote_thread_alive, /* to_thread_alive */ | |
1765 | 0, /* to_stop */ | |
1766 | process_stratum, /* to_stratum */ | |
1767 | NULL, /* to_next */ | |
1768 | 1, /* to_has_all_memory */ | |
1769 | 1, /* to_has_memory */ | |
1770 | 1, /* to_has_stack */ | |
1771 | 1, /* to_has_registers */ | |
1772 | 1, /* to_has_execution */ | |
1773 | NULL, /* sections */ | |
1774 | NULL, /* sections_end */ | |
1775 | OPS_MAGIC /* to_magic */ | |
1776 | }; | |
1777 | ||
bd5635a1 RP |
1778 | void |
1779 | _initialize_remote () | |
1780 | { | |
1781 | add_target (&remote_ops); | |
2b576293 | 1782 | add_target (&extended_remote_ops); |
976bb0be | 1783 | } |