Commit | Line | Data |
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33742334 | 1 | /* Remote debugging interface for MIPS remote debugging protocol. |
5efb3899 | 2 | Copyright 1993, 1994 Free Software Foundation, Inc. |
33742334 ILT |
3 | Contributed by Cygnus Support. Written by Ian Lance Taylor |
4 | <ian@cygnus.com>. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "inferior.h" | |
24 | #include "bfd.h" | |
77641260 | 25 | #include "symfile.h" |
33742334 ILT |
26 | #include "wait.h" |
27 | #include "gdbcmd.h" | |
28 | #include "gdbcore.h" | |
29 | #include "serial.h" | |
30 | #include "target.h" | |
66a48870 | 31 | #include "remote-utils.h" |
33742334 ILT |
32 | |
33 | #include <signal.h> | |
96e5f161 | 34 | #include <varargs.h> |
33742334 ILT |
35 | \f |
36 | /* Prototypes for local functions. */ | |
37 | ||
38 | static int | |
39 | mips_readchar PARAMS ((int timeout)); | |
40 | ||
41 | static int | |
42 | mips_receive_header PARAMS ((unsigned char *hdr, int *pgarbage, int ch, | |
43 | int timeout)); | |
44 | ||
45 | static int | |
46 | mips_receive_trailer PARAMS ((unsigned char *trlr, int *pgarbage, int *pch, | |
47 | int timeout)); | |
48 | ||
49 | static int mips_cksum PARAMS ((const unsigned char *hdr, | |
50 | const unsigned char *data, | |
51 | int len)); | |
52 | ||
53 | static void | |
c2a0f1cb | 54 | mips_send_packet PARAMS ((const char *s, int get_ack)); |
33742334 | 55 | |
4c6071f7 JK |
56 | static int mips_receive_packet PARAMS ((char *buff, int throw_error, |
57 | int timeout)); | |
33742334 ILT |
58 | |
59 | static int | |
60 | mips_request PARAMS ((char cmd, unsigned int addr, unsigned int data, | |
4c6071f7 | 61 | int *perr, timeout)); |
33742334 | 62 | |
c2a0f1cb ILT |
63 | static void |
64 | mips_initialize PARAMS ((void)); | |
65 | ||
33742334 ILT |
66 | static void |
67 | mips_open PARAMS ((char *name, int from_tty)); | |
68 | ||
69 | static void | |
70 | mips_close PARAMS ((int quitting)); | |
71 | ||
72 | static void | |
73 | mips_detach PARAMS ((char *args, int from_tty)); | |
74 | ||
67ac9759 JK |
75 | static void mips_resume PARAMS ((int pid, int step, |
76 | enum target_signal siggnal)); | |
33742334 ILT |
77 | |
78 | static int | |
de43d7d0 | 79 | mips_wait PARAMS ((int pid, WAITTYPE *status)); |
33742334 ILT |
80 | |
81 | static int | |
82 | mips_map_regno PARAMS ((int regno)); | |
83 | ||
84 | static void | |
85 | mips_fetch_registers PARAMS ((int regno)); | |
86 | ||
87 | static void | |
88 | mips_prepare_to_store PARAMS ((void)); | |
89 | ||
90 | static void | |
91 | mips_store_registers PARAMS ((int regno)); | |
92 | ||
93 | static int | |
94 | mips_fetch_word PARAMS ((CORE_ADDR addr)); | |
95 | ||
96 | static void | |
97 | mips_store_word PARAMS ((CORE_ADDR addr, int value)); | |
98 | ||
99 | static int | |
100 | mips_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len, | |
101 | int write, struct target_ops *ignore)); | |
102 | ||
103 | static void | |
104 | mips_files_info PARAMS ((struct target_ops *ignore)); | |
105 | ||
106 | static void | |
107 | mips_load PARAMS ((char *args, int from_tty)); | |
108 | ||
109 | static void | |
110 | mips_create_inferior PARAMS ((char *execfile, char *args, char **env)); | |
111 | ||
112 | static void | |
113 | mips_mourn_inferior PARAMS ((void)); | |
114 | ||
115 | /* A forward declaration. */ | |
116 | extern struct target_ops mips_ops; | |
117 | \f | |
118 | /* The MIPS remote debugging interface is built on top of a simple | |
119 | packet protocol. Each packet is organized as follows: | |
120 | ||
121 | SYN The first character is always a SYN (ASCII 026, or ^V). SYN | |
122 | may not appear anywhere else in the packet. Any time a SYN is | |
123 | seen, a new packet should be assumed to have begun. | |
124 | ||
125 | TYPE_LEN | |
126 | This byte contains the upper five bits of the logical length | |
127 | of the data section, plus a single bit indicating whether this | |
128 | is a data packet or an acknowledgement. The documentation | |
129 | indicates that this bit is 1 for a data packet, but the actual | |
130 | board uses 1 for an acknowledgement. The value of the byte is | |
131 | 0x40 + (ack ? 0x20 : 0) + (len >> 6) | |
132 | (we always have 0 <= len < 1024). Acknowledgement packets do | |
133 | not carry data, and must have a data length of 0. | |
134 | ||
135 | LEN1 This byte contains the lower six bits of the logical length of | |
136 | the data section. The value is | |
137 | 0x40 + (len & 0x3f) | |
138 | ||
139 | SEQ This byte contains the six bit sequence number of the packet. | |
140 | The value is | |
141 | 0x40 + seq | |
142 | An acknowlegment packet contains the sequence number of the | |
143 | packet being acknowledged plus 1 module 64. Data packets are | |
144 | transmitted in sequence. There may only be one outstanding | |
145 | unacknowledged data packet at a time. The sequence numbers | |
146 | are independent in each direction. If an acknowledgement for | |
147 | the previous packet is received (i.e., an acknowledgement with | |
148 | the sequence number of the packet just sent) the packet just | |
149 | sent should be retransmitted. If no acknowledgement is | |
150 | received within a timeout period, the packet should be | |
151 | retransmitted. This has an unfortunate failure condition on a | |
152 | high-latency line, as a delayed acknowledgement may lead to an | |
153 | endless series of duplicate packets. | |
154 | ||
155 | DATA The actual data bytes follow. The following characters are | |
156 | escaped inline with DLE (ASCII 020, or ^P): | |
157 | SYN (026) DLE S | |
158 | DLE (020) DLE D | |
159 | ^C (003) DLE C | |
160 | ^S (023) DLE s | |
161 | ^Q (021) DLE q | |
162 | The additional DLE characters are not counted in the logical | |
163 | length stored in the TYPE_LEN and LEN1 bytes. | |
164 | ||
165 | CSUM1 | |
166 | CSUM2 | |
167 | CSUM3 | |
168 | These bytes contain an 18 bit checksum of the complete | |
169 | contents of the packet excluding the SEQ byte and the | |
170 | CSUM[123] bytes. The checksum is simply the twos complement | |
171 | addition of all the bytes treated as unsigned characters. The | |
172 | values of the checksum bytes are: | |
173 | CSUM1: 0x40 + ((cksum >> 12) & 0x3f) | |
174 | CSUM2: 0x40 + ((cksum >> 6) & 0x3f) | |
175 | CSUM3: 0x40 + (cksum & 0x3f) | |
176 | ||
177 | It happens that the MIPS remote debugging protocol always | |
178 | communicates with ASCII strings. Because of this, this | |
179 | implementation doesn't bother to handle the DLE quoting mechanism, | |
180 | since it will never be required. */ | |
181 | ||
182 | /* The SYN character which starts each packet. */ | |
183 | #define SYN '\026' | |
184 | ||
185 | /* The 0x40 used to offset each packet (this value ensures that all of | |
186 | the header and trailer bytes, other than SYN, are printable ASCII | |
187 | characters). */ | |
188 | #define HDR_OFFSET 0x40 | |
189 | ||
190 | /* The indices of the bytes in the packet header. */ | |
191 | #define HDR_INDX_SYN 0 | |
192 | #define HDR_INDX_TYPE_LEN 1 | |
193 | #define HDR_INDX_LEN1 2 | |
194 | #define HDR_INDX_SEQ 3 | |
195 | #define HDR_LENGTH 4 | |
196 | ||
197 | /* The data/ack bit in the TYPE_LEN header byte. */ | |
198 | #define TYPE_LEN_DA_BIT 0x20 | |
199 | #define TYPE_LEN_DATA 0 | |
200 | #define TYPE_LEN_ACK TYPE_LEN_DA_BIT | |
201 | ||
202 | /* How to compute the header bytes. */ | |
203 | #define HDR_SET_SYN(data, len, seq) (SYN) | |
204 | #define HDR_SET_TYPE_LEN(data, len, seq) \ | |
205 | (HDR_OFFSET \ | |
206 | + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \ | |
207 | + (((len) >> 6) & 0x1f)) | |
208 | #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f)) | |
209 | #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq)) | |
210 | ||
211 | /* Check that a header byte is reasonable. */ | |
212 | #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET) | |
213 | ||
214 | /* Get data from the header. These macros evaluate their argument | |
215 | multiple times. */ | |
216 | #define HDR_IS_DATA(hdr) \ | |
217 | (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA) | |
218 | #define HDR_GET_LEN(hdr) \ | |
219 | ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f))) | |
220 | #define HDR_GET_SEQ(hdr) ((hdr)[HDR_INDX_SEQ] & 0x3f) | |
221 | ||
222 | /* The maximum data length. */ | |
223 | #define DATA_MAXLEN 1023 | |
224 | ||
225 | /* The trailer offset. */ | |
226 | #define TRLR_OFFSET HDR_OFFSET | |
227 | ||
228 | /* The indices of the bytes in the packet trailer. */ | |
229 | #define TRLR_INDX_CSUM1 0 | |
230 | #define TRLR_INDX_CSUM2 1 | |
231 | #define TRLR_INDX_CSUM3 2 | |
232 | #define TRLR_LENGTH 3 | |
233 | ||
234 | /* How to compute the trailer bytes. */ | |
235 | #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f)) | |
236 | #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f)) | |
237 | #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f)) | |
238 | ||
239 | /* Check that a trailer byte is reasonable. */ | |
240 | #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET) | |
241 | ||
242 | /* Get data from the trailer. This evaluates its argument multiple | |
243 | times. */ | |
244 | #define TRLR_GET_CKSUM(trlr) \ | |
245 | ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \ | |
246 | + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \ | |
247 | + ((trlr)[TRLR_INDX_CSUM3] & 0x3f)) | |
248 | ||
249 | /* The sequence number modulos. */ | |
250 | #define SEQ_MODULOS (64) | |
251 | ||
252 | /* Set to 1 if the target is open. */ | |
253 | static int mips_is_open; | |
254 | ||
c2a0f1cb ILT |
255 | /* Set to 1 while the connection is being initialized. */ |
256 | static int mips_initializing; | |
257 | ||
33742334 ILT |
258 | /* The next sequence number to send. */ |
259 | static int mips_send_seq; | |
260 | ||
261 | /* The next sequence number we expect to receive. */ | |
262 | static int mips_receive_seq; | |
263 | ||
264 | /* The time to wait before retransmitting a packet, in seconds. */ | |
265 | static int mips_retransmit_wait = 3; | |
266 | ||
267 | /* The number of times to try retransmitting a packet before giving up. */ | |
268 | static int mips_send_retries = 10; | |
269 | ||
270 | /* The number of garbage characters to accept when looking for an | |
271 | SYN for the next packet. */ | |
272 | static int mips_syn_garbage = 1050; | |
273 | ||
274 | /* The time to wait for a packet, in seconds. */ | |
c2a0f1cb | 275 | static int mips_receive_wait = 5; |
33742334 ILT |
276 | |
277 | /* Set if we have sent a packet to the board but have not yet received | |
278 | a reply. */ | |
279 | static int mips_need_reply = 0; | |
280 | ||
1724c671 SG |
281 | /* Handle used to access serial I/O stream. */ |
282 | static serial_t mips_desc; | |
283 | ||
4fb192be JK |
284 | /* Handle low-level error that we can't recover from. Note that just |
285 | error()ing out from target_wait or some such low-level place will cause | |
286 | all hell to break loose--the rest of GDB will tend to get left in an | |
287 | inconsistent state. */ | |
288 | ||
289 | static void NORETURN | |
290 | mips_error (va_alist) | |
291 | va_dcl | |
292 | { | |
293 | va_list args; | |
294 | char *string; | |
295 | ||
296 | va_start (args); | |
297 | target_terminal_ours (); | |
298 | wrap_here(""); /* Force out any buffered output */ | |
299 | gdb_flush (gdb_stdout); | |
300 | if (error_pre_print) | |
301 | fprintf_filtered (gdb_stderr, error_pre_print); | |
302 | string = va_arg (args, char *); | |
303 | vfprintf_filtered (gdb_stderr, string, args); | |
304 | fprintf_filtered (gdb_stderr, "\n"); | |
305 | va_end (args); | |
306 | ||
96e5f161 JK |
307 | /* Clean up in such a way that mips_close won't try to talk to the |
308 | board (it almost surely won't work since we weren't able to talk to | |
309 | it). */ | |
310 | mips_is_open = 0; | |
311 | SERIAL_CLOSE (mips_desc); | |
312 | ||
313 | printf_unfiltered ("Ending remote MIPS debugging.\n"); | |
4fb192be JK |
314 | target_mourn_inferior (); |
315 | ||
316 | return_to_top_level (RETURN_ERROR); | |
317 | } | |
318 | ||
9a9a88c1 ILT |
319 | /* Read a character from the remote, aborting on error. Returns |
320 | SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR | |
321 | returns). FIXME: If we see the string "<IDT>" from the board, then | |
322 | we are debugging on the main console port, and we have somehow | |
323 | dropped out of remote debugging mode. In this case, we | |
324 | automatically go back in to remote debugging mode. This is a hack, | |
325 | put in because I can't find any way for a program running on the | |
326 | remote board to terminate without also ending remote debugging | |
327 | mode. I assume users won't have any trouble with this; for one | |
328 | thing, the IDT documentation generally assumes that the remote | |
329 | debugging port is not the console port. This is, however, very | |
330 | convenient for DejaGnu when you only have one connected serial | |
331 | port. */ | |
33742334 ILT |
332 | |
333 | static int | |
334 | mips_readchar (timeout) | |
335 | int timeout; | |
336 | { | |
337 | int ch; | |
c2a0f1cb ILT |
338 | static int state = 0; |
339 | static char nextstate[5] = { '<', 'I', 'D', 'T', '>' }; | |
33742334 | 340 | |
1724c671 SG |
341 | ch = SERIAL_READCHAR (mips_desc, timeout); |
342 | if (ch == SERIAL_EOF) | |
4fb192be | 343 | mips_error ("End of file from remote"); |
1724c671 | 344 | if (ch == SERIAL_ERROR) |
4fb192be | 345 | mips_error ("Error reading from remote: %s", safe_strerror (errno)); |
66a48870 | 346 | if (sr_get_debug () > 1) |
33742334 | 347 | { |
1724c671 | 348 | if (ch != SERIAL_TIMEOUT) |
33742334 ILT |
349 | printf_filtered ("Read '%c' %d 0x%x\n", ch, ch, ch); |
350 | else | |
351 | printf_filtered ("Timed out in read\n"); | |
352 | } | |
c2a0f1cb ILT |
353 | |
354 | /* If we have seen <IDT> and we either time out, or we see a @ | |
355 | (which was echoed from a packet we sent), reset the board as | |
356 | described above. The first character in a packet after the SYN | |
357 | (which is not echoed) is always an @ unless the packet is more | |
358 | than 64 characters long, which ours never are. */ | |
1724c671 | 359 | if ((ch == SERIAL_TIMEOUT || ch == '@') |
c2a0f1cb ILT |
360 | && state == 5 |
361 | && ! mips_initializing) | |
362 | { | |
66a48870 | 363 | if (sr_get_debug () > 0) |
c2a0f1cb | 364 | printf_filtered ("Reinitializing MIPS debugging mode\n"); |
1724c671 | 365 | SERIAL_WRITE (mips_desc, "\rdb tty0\r", sizeof "\rdb tty0\r" - 1); |
c2a0f1cb ILT |
366 | sleep (1); |
367 | ||
368 | mips_need_reply = 0; | |
369 | mips_initialize (); | |
370 | ||
371 | state = 0; | |
372 | ||
4fb192be | 373 | mips_error ("Remote board reset"); |
c2a0f1cb ILT |
374 | } |
375 | ||
376 | if (ch == nextstate[state]) | |
377 | ++state; | |
378 | else | |
379 | state = 0; | |
380 | ||
33742334 ILT |
381 | return ch; |
382 | } | |
383 | ||
384 | /* Get a packet header, putting the data in the supplied buffer. | |
385 | PGARBAGE is a pointer to the number of garbage characters received | |
386 | so far. CH is the last character received. Returns 0 for success, | |
387 | or -1 for timeout. */ | |
388 | ||
389 | static int | |
390 | mips_receive_header (hdr, pgarbage, ch, timeout) | |
391 | unsigned char *hdr; | |
392 | int *pgarbage; | |
393 | int ch; | |
394 | int timeout; | |
395 | { | |
396 | int i; | |
397 | ||
398 | while (1) | |
399 | { | |
400 | /* Wait for a SYN. mips_syn_garbage is intended to prevent | |
401 | sitting here indefinitely if the board sends us one garbage | |
402 | character per second. ch may already have a value from the | |
403 | last time through the loop. */ | |
404 | while (ch != SYN) | |
405 | { | |
406 | ch = mips_readchar (timeout); | |
9a9a88c1 | 407 | if (ch == SERIAL_TIMEOUT) |
33742334 ILT |
408 | return -1; |
409 | if (ch != SYN) | |
410 | { | |
411 | /* Printing the character here lets the user of gdb see | |
412 | what the program is outputting, if the debugging is | |
413 | being done on the console port. FIXME: Perhaps this | |
414 | should be filtered? */ | |
66a48870 | 415 | if (! mips_initializing || sr_get_debug () > 0) |
c2a0f1cb | 416 | { |
199b2450 TL |
417 | putchar_unfiltered (ch); |
418 | gdb_flush (gdb_stdout); | |
c2a0f1cb | 419 | } |
33742334 ILT |
420 | |
421 | ++*pgarbage; | |
422 | if (*pgarbage > mips_syn_garbage) | |
4fb192be | 423 | mips_error ("Remote debugging protocol failure"); |
33742334 ILT |
424 | } |
425 | } | |
426 | ||
427 | /* Get the packet header following the SYN. */ | |
428 | for (i = 1; i < HDR_LENGTH; i++) | |
429 | { | |
430 | ch = mips_readchar (timeout); | |
9a9a88c1 | 431 | if (ch == SERIAL_TIMEOUT) |
33742334 ILT |
432 | return -1; |
433 | ||
434 | /* Make sure this is a header byte. */ | |
435 | if (ch == SYN || ! HDR_CHECK (ch)) | |
436 | break; | |
437 | ||
438 | hdr[i] = ch; | |
439 | } | |
440 | ||
441 | /* If we got the complete header, we can return. Otherwise we | |
442 | loop around and keep looking for SYN. */ | |
443 | if (i >= HDR_LENGTH) | |
444 | return 0; | |
445 | } | |
446 | } | |
447 | ||
448 | /* Get a packet header, putting the data in the supplied buffer. | |
449 | PGARBAGE is a pointer to the number of garbage characters received | |
450 | so far. The last character read is returned in *PCH. Returns 0 | |
451 | for success, -1 for timeout, -2 for error. */ | |
452 | ||
453 | static int | |
454 | mips_receive_trailer (trlr, pgarbage, pch, timeout) | |
455 | unsigned char *trlr; | |
456 | int *pgarbage; | |
457 | int *pch; | |
458 | int timeout; | |
459 | { | |
460 | int i; | |
461 | int ch; | |
462 | ||
463 | for (i = 0; i < TRLR_LENGTH; i++) | |
464 | { | |
465 | ch = mips_readchar (timeout); | |
466 | *pch = ch; | |
9a9a88c1 | 467 | if (ch == SERIAL_TIMEOUT) |
33742334 ILT |
468 | return -1; |
469 | if (! TRLR_CHECK (ch)) | |
470 | return -2; | |
471 | trlr[i] = ch; | |
472 | } | |
473 | return 0; | |
474 | } | |
475 | ||
476 | /* Get the checksum of a packet. HDR points to the packet header. | |
477 | DATA points to the packet data. LEN is the length of DATA. */ | |
478 | ||
479 | static int | |
480 | mips_cksum (hdr, data, len) | |
481 | const unsigned char *hdr; | |
482 | const unsigned char *data; | |
483 | int len; | |
484 | { | |
485 | register const unsigned char *p; | |
486 | register int c; | |
487 | register int cksum; | |
488 | ||
489 | cksum = 0; | |
490 | ||
491 | /* The initial SYN is not included in the checksum. */ | |
492 | c = HDR_LENGTH - 1; | |
493 | p = hdr + 1; | |
494 | while (c-- != 0) | |
495 | cksum += *p++; | |
496 | ||
497 | c = len; | |
498 | p = data; | |
499 | while (c-- != 0) | |
500 | cksum += *p++; | |
501 | ||
502 | return cksum; | |
503 | } | |
504 | ||
505 | /* Send a packet containing the given ASCII string. */ | |
506 | ||
507 | static void | |
c2a0f1cb | 508 | mips_send_packet (s, get_ack) |
33742334 | 509 | const char *s; |
c2a0f1cb | 510 | int get_ack; |
33742334 ILT |
511 | { |
512 | unsigned int len; | |
513 | unsigned char *packet; | |
514 | register int cksum; | |
515 | int try; | |
516 | ||
517 | len = strlen (s); | |
518 | if (len > DATA_MAXLEN) | |
4fb192be | 519 | mips_error ("MIPS protocol data packet too long: %s", s); |
33742334 ILT |
520 | |
521 | packet = (unsigned char *) alloca (HDR_LENGTH + len + TRLR_LENGTH + 1); | |
522 | ||
523 | packet[HDR_INDX_SYN] = HDR_SET_SYN (1, len, mips_send_seq); | |
524 | packet[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (1, len, mips_send_seq); | |
525 | packet[HDR_INDX_LEN1] = HDR_SET_LEN1 (1, len, mips_send_seq); | |
526 | packet[HDR_INDX_SEQ] = HDR_SET_SEQ (1, len, mips_send_seq); | |
527 | ||
528 | memcpy (packet + HDR_LENGTH, s, len); | |
529 | ||
530 | cksum = mips_cksum (packet, packet + HDR_LENGTH, len); | |
531 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); | |
532 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); | |
533 | packet[HDR_LENGTH + len + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); | |
534 | ||
535 | /* Increment the sequence number. This will set mips_send_seq to | |
536 | the sequence number we expect in the acknowledgement. */ | |
537 | mips_send_seq = (mips_send_seq + 1) % SEQ_MODULOS; | |
538 | ||
c2a0f1cb ILT |
539 | if (! get_ack) |
540 | return; | |
541 | ||
33742334 ILT |
542 | /* We can only have one outstanding data packet, so we just wait for |
543 | the acknowledgement here. Keep retransmitting the packet until | |
544 | we get one, or until we've tried too many times. */ | |
545 | for (try = 0; try < mips_send_retries; try++) | |
546 | { | |
547 | int garbage; | |
548 | int ch; | |
549 | ||
66a48870 | 550 | if (sr_get_debug () > 0) |
33742334 ILT |
551 | { |
552 | packet[HDR_LENGTH + len + TRLR_LENGTH] = '\0'; | |
553 | printf_filtered ("Writing \"%s\"\n", packet + 1); | |
554 | } | |
555 | ||
9a9a88c1 ILT |
556 | if (SERIAL_WRITE (mips_desc, packet, |
557 | HDR_LENGTH + len + TRLR_LENGTH) != 0) | |
4fb192be | 558 | mips_error ("write to target failed: %s", safe_strerror (errno)); |
33742334 ILT |
559 | |
560 | garbage = 0; | |
561 | ch = 0; | |
562 | while (1) | |
563 | { | |
564 | unsigned char hdr[HDR_LENGTH + 1]; | |
565 | unsigned char trlr[TRLR_LENGTH + 1]; | |
566 | int err; | |
567 | int seq; | |
568 | ||
569 | /* Get the packet header. If we time out, resend the data | |
570 | packet. */ | |
571 | err = mips_receive_header (hdr, &garbage, ch, mips_retransmit_wait); | |
572 | if (err != 0) | |
573 | break; | |
574 | ||
575 | ch = 0; | |
576 | ||
577 | /* If we get a data packet, assume it is a duplicate and | |
578 | ignore it. FIXME: If the acknowledgement is lost, this | |
579 | data packet may be the packet the remote sends after the | |
580 | acknowledgement. */ | |
581 | if (HDR_IS_DATA (hdr)) | |
582 | continue; | |
583 | ||
584 | /* If the length is not 0, this is a garbled packet. */ | |
585 | if (HDR_GET_LEN (hdr) != 0) | |
586 | continue; | |
587 | ||
588 | /* Get the packet trailer. */ | |
589 | err = mips_receive_trailer (trlr, &garbage, &ch, | |
590 | mips_retransmit_wait); | |
591 | ||
592 | /* If we timed out, resend the data packet. */ | |
593 | if (err == -1) | |
594 | break; | |
595 | ||
596 | /* If we got a bad character, reread the header. */ | |
597 | if (err != 0) | |
598 | continue; | |
599 | ||
600 | /* If the checksum does not match the trailer checksum, this | |
601 | is a bad packet; ignore it. */ | |
602 | if (mips_cksum (hdr, (unsigned char *) NULL, 0) | |
603 | != TRLR_GET_CKSUM (trlr)) | |
604 | continue; | |
605 | ||
66a48870 | 606 | if (sr_get_debug () > 0) |
33742334 ILT |
607 | { |
608 | hdr[HDR_LENGTH] = '\0'; | |
609 | trlr[TRLR_LENGTH] = '\0'; | |
610 | printf_filtered ("Got ack %d \"%s%s\"\n", | |
f63f30e2 | 611 | HDR_GET_SEQ (hdr), hdr + 1, trlr); |
33742334 ILT |
612 | } |
613 | ||
614 | /* If this ack is for the current packet, we're done. */ | |
615 | seq = HDR_GET_SEQ (hdr); | |
616 | if (seq == mips_send_seq) | |
617 | return; | |
618 | ||
619 | /* If this ack is for the last packet, resend the current | |
620 | packet. */ | |
621 | if ((seq + 1) % SEQ_MODULOS == mips_send_seq) | |
622 | break; | |
623 | ||
624 | /* Otherwise this is a bad ack; ignore it. Increment the | |
625 | garbage count to ensure that we do not stay in this loop | |
626 | forever. */ | |
627 | ++garbage; | |
628 | } | |
629 | } | |
630 | ||
4fb192be | 631 | mips_error ("Remote did not acknowledge packet"); |
33742334 ILT |
632 | } |
633 | ||
634 | /* Receive and acknowledge a packet, returning the data in BUFF (which | |
635 | should be DATA_MAXLEN + 1 bytes). The protocol documentation | |
636 | implies that only the sender retransmits packets, so this code just | |
637 | waits silently for a packet. It returns the length of the received | |
96e5f161 JK |
638 | packet. If THROW_ERROR is nonzero, call error() on errors. If not, |
639 | don't print an error message and return -1. */ | |
33742334 ILT |
640 | |
641 | static int | |
4c6071f7 | 642 | mips_receive_packet (buff, throw_error, timeout) |
33742334 | 643 | char *buff; |
96e5f161 | 644 | int throw_error; |
4c6071f7 | 645 | int timeout; |
33742334 ILT |
646 | { |
647 | int ch; | |
648 | int garbage; | |
649 | int len; | |
650 | unsigned char ack[HDR_LENGTH + TRLR_LENGTH + 1]; | |
651 | int cksum; | |
652 | ||
653 | ch = 0; | |
654 | garbage = 0; | |
655 | while (1) | |
656 | { | |
657 | unsigned char hdr[HDR_LENGTH]; | |
658 | unsigned char trlr[TRLR_LENGTH]; | |
659 | int i; | |
660 | int err; | |
661 | ||
4c6071f7 | 662 | if (mips_receive_header (hdr, &garbage, ch, timeout) != 0) |
96e5f161 JK |
663 | { |
664 | if (throw_error) | |
665 | mips_error ("Timed out waiting for remote packet"); | |
666 | else | |
667 | return -1; | |
668 | } | |
33742334 ILT |
669 | |
670 | ch = 0; | |
671 | ||
672 | /* An acknowledgement is probably a duplicate; ignore it. */ | |
673 | if (! HDR_IS_DATA (hdr)) | |
674 | { | |
66a48870 | 675 | if (sr_get_debug () > 0) |
33742334 ILT |
676 | printf_filtered ("Ignoring unexpected ACK\n"); |
677 | continue; | |
678 | } | |
679 | ||
680 | /* If this is the wrong sequence number, ignore it. */ | |
681 | if (HDR_GET_SEQ (hdr) != mips_receive_seq) | |
682 | { | |
66a48870 | 683 | if (sr_get_debug () > 0) |
33742334 ILT |
684 | printf_filtered ("Ignoring sequence number %d (want %d)\n", |
685 | HDR_GET_SEQ (hdr), mips_receive_seq); | |
686 | continue; | |
687 | } | |
688 | ||
689 | len = HDR_GET_LEN (hdr); | |
690 | ||
691 | for (i = 0; i < len; i++) | |
692 | { | |
693 | int rch; | |
694 | ||
4c6071f7 | 695 | rch = mips_readchar (timeout); |
33742334 ILT |
696 | if (rch == SYN) |
697 | { | |
698 | ch = SYN; | |
699 | break; | |
700 | } | |
9a9a88c1 | 701 | if (rch == SERIAL_TIMEOUT) |
96e5f161 JK |
702 | { |
703 | if (throw_error) | |
704 | mips_error ("Timed out waiting for remote packet"); | |
705 | else | |
706 | return -1; | |
707 | } | |
33742334 ILT |
708 | buff[i] = rch; |
709 | } | |
710 | ||
711 | if (i < len) | |
712 | { | |
66a48870 | 713 | if (sr_get_debug () > 0) |
33742334 ILT |
714 | printf_filtered ("Got new SYN after %d chars (wanted %d)\n", |
715 | i, len); | |
716 | continue; | |
717 | } | |
718 | ||
4c6071f7 | 719 | err = mips_receive_trailer (trlr, &garbage, &ch, timeout); |
33742334 | 720 | if (err == -1) |
96e5f161 JK |
721 | { |
722 | if (throw_error) | |
723 | mips_error ("Timed out waiting for packet"); | |
724 | else | |
725 | return -1; | |
726 | } | |
33742334 ILT |
727 | if (err == -2) |
728 | { | |
66a48870 | 729 | if (sr_get_debug () > 0) |
33742334 ILT |
730 | printf_filtered ("Got SYN when wanted trailer\n"); |
731 | continue; | |
732 | } | |
733 | ||
734 | if (mips_cksum (hdr, buff, len) == TRLR_GET_CKSUM (trlr)) | |
735 | break; | |
736 | ||
66a48870 | 737 | if (sr_get_debug () > 0) |
33742334 ILT |
738 | printf_filtered ("Bad checksum; data %d, trailer %d\n", |
739 | mips_cksum (hdr, buff, len), | |
740 | TRLR_GET_CKSUM (trlr)); | |
741 | ||
742 | /* The checksum failed. Send an acknowledgement for the | |
743 | previous packet to tell the remote to resend the packet. */ | |
744 | ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); | |
745 | ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); | |
746 | ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); | |
747 | ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); | |
748 | ||
749 | cksum = mips_cksum (ack, (unsigned char *) NULL, 0); | |
750 | ||
751 | ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); | |
752 | ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); | |
753 | ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); | |
754 | ||
66a48870 | 755 | if (sr_get_debug () > 0) |
33742334 ILT |
756 | { |
757 | ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; | |
758 | printf_filtered ("Writing ack %d \"%s\"\n", mips_receive_seq, | |
759 | ack + 1); | |
760 | } | |
761 | ||
9a9a88c1 | 762 | if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) |
96e5f161 JK |
763 | { |
764 | if (throw_error) | |
765 | mips_error ("write to target failed: %s", safe_strerror (errno)); | |
766 | else | |
767 | return -1; | |
768 | } | |
33742334 ILT |
769 | } |
770 | ||
66a48870 | 771 | if (sr_get_debug () > 0) |
33742334 ILT |
772 | { |
773 | buff[len] = '\0'; | |
774 | printf_filtered ("Got packet \"%s\"\n", buff); | |
775 | } | |
776 | ||
777 | /* We got the packet. Send an acknowledgement. */ | |
778 | mips_receive_seq = (mips_receive_seq + 1) % SEQ_MODULOS; | |
779 | ||
780 | ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); | |
781 | ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); | |
782 | ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); | |
783 | ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); | |
784 | ||
785 | cksum = mips_cksum (ack, (unsigned char *) NULL, 0); | |
786 | ||
787 | ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); | |
788 | ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); | |
789 | ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); | |
790 | ||
66a48870 | 791 | if (sr_get_debug () > 0) |
33742334 ILT |
792 | { |
793 | ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; | |
794 | printf_filtered ("Writing ack %d \"%s\"\n", mips_receive_seq, | |
795 | ack + 1); | |
796 | } | |
797 | ||
9a9a88c1 | 798 | if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) |
96e5f161 JK |
799 | { |
800 | if (throw_error) | |
801 | mips_error ("write to target failed: %s", safe_strerror (errno)); | |
802 | else | |
803 | return -1; | |
804 | } | |
33742334 ILT |
805 | |
806 | return len; | |
807 | } | |
808 | \f | |
809 | /* Optionally send a request to the remote system and optionally wait | |
810 | for the reply. This implements the remote debugging protocol, | |
811 | which is built on top of the packet protocol defined above. Each | |
812 | request has an ADDR argument and a DATA argument. The following | |
813 | requests are defined: | |
814 | ||
815 | \0 don't send a request; just wait for a reply | |
816 | i read word from instruction space at ADDR | |
817 | d read word from data space at ADDR | |
818 | I write DATA to instruction space at ADDR | |
819 | D write DATA to data space at ADDR | |
820 | r read register number ADDR | |
821 | R set register number ADDR to value DATA | |
822 | c continue execution (if ADDR != 1, set pc to ADDR) | |
823 | s single step (if ADDR != 1, set pc to ADDR) | |
824 | ||
825 | The read requests return the value requested. The write requests | |
826 | return the previous value in the changed location. The execution | |
827 | requests return a UNIX wait value (the approximate signal which | |
828 | caused execution to stop is in the upper eight bits). | |
829 | ||
830 | If PERR is not NULL, this function waits for a reply. If an error | |
831 | occurs, it sets *PERR to 1 and sets errno according to what the | |
832 | target board reports. */ | |
833 | ||
834 | static int | |
4c6071f7 | 835 | mips_request (cmd, addr, data, perr, timeout) |
33742334 ILT |
836 | char cmd; |
837 | unsigned int addr; | |
838 | unsigned int data; | |
839 | int *perr; | |
4c6071f7 | 840 | int timeout; |
33742334 ILT |
841 | { |
842 | char buff[DATA_MAXLEN + 1]; | |
843 | int len; | |
844 | int rpid; | |
845 | char rcmd; | |
846 | int rerrflg; | |
847 | int rresponse; | |
848 | ||
849 | if (cmd != '\0') | |
850 | { | |
851 | if (mips_need_reply) | |
852 | fatal ("mips_request: Trying to send command before reply"); | |
853 | sprintf (buff, "0x0 %c 0x%x 0x%x", cmd, addr, data); | |
c2a0f1cb | 854 | mips_send_packet (buff, 1); |
33742334 ILT |
855 | mips_need_reply = 1; |
856 | } | |
857 | ||
858 | if (perr == (int *) NULL) | |
859 | return 0; | |
860 | ||
861 | if (! mips_need_reply) | |
862 | fatal ("mips_request: Trying to get reply before command"); | |
863 | ||
864 | mips_need_reply = 0; | |
865 | ||
4c6071f7 | 866 | len = mips_receive_packet (buff, 1, timeout); |
33742334 ILT |
867 | buff[len] = '\0'; |
868 | ||
869 | if (sscanf (buff, "0x%x %c 0x%x 0x%x", | |
870 | &rpid, &rcmd, &rerrflg, &rresponse) != 4 | |
33742334 | 871 | || (cmd != '\0' && rcmd != cmd)) |
4fb192be | 872 | mips_error ("Bad response from remote board"); |
33742334 ILT |
873 | |
874 | if (rerrflg != 0) | |
875 | { | |
876 | *perr = 1; | |
877 | ||
878 | /* FIXME: This will returns MIPS errno numbers, which may or may | |
879 | not be the same as errno values used on other systems. If | |
880 | they stick to common errno values, they will be the same, but | |
881 | if they don't, they must be translated. */ | |
882 | errno = rresponse; | |
883 | ||
884 | return 0; | |
885 | } | |
886 | ||
887 | *perr = 0; | |
888 | return rresponse; | |
889 | } | |
890 | ||
c2a0f1cb ILT |
891 | /* Initialize a new connection to the MIPS board, and make sure we are |
892 | really connected. */ | |
893 | ||
894 | static void | |
895 | mips_initialize () | |
896 | { | |
897 | char cr; | |
c2a0f1cb ILT |
898 | char buff[DATA_MAXLEN + 1]; |
899 | int err; | |
900 | ||
901 | if (mips_initializing) | |
902 | return; | |
903 | ||
904 | mips_initializing = 1; | |
905 | ||
906 | mips_send_seq = 0; | |
907 | mips_receive_seq = 0; | |
908 | ||
909 | /* The board seems to want to send us a packet. I don't know what | |
910 | it means. The packet seems to be triggered by a carriage return | |
911 | character, although perhaps any character would do. */ | |
912 | cr = '\r'; | |
9a9a88c1 | 913 | SERIAL_WRITE (mips_desc, &cr, 1); |
c2a0f1cb | 914 | |
4c6071f7 | 915 | if (mips_receive_packet (buff, 0, 3) < 0) |
c2a0f1cb ILT |
916 | { |
917 | char cc; | |
918 | ||
c2a0f1cb ILT |
919 | /* We did not receive the packet we expected; try resetting the |
920 | board and trying again. */ | |
921 | printf_filtered ("Failed to initialize; trying to reset board\n"); | |
922 | cc = '\003'; | |
1724c671 | 923 | SERIAL_WRITE (mips_desc, &cc, 1); |
c2a0f1cb | 924 | sleep (2); |
1724c671 | 925 | SERIAL_WRITE (mips_desc, "\rdb tty0\r", sizeof "\rdb tty0\r" - 1); |
c2a0f1cb ILT |
926 | sleep (1); |
927 | cr = '\r'; | |
1724c671 | 928 | SERIAL_WRITE (mips_desc, &cr, 1); |
c2a0f1cb | 929 | } |
4c6071f7 | 930 | mips_receive_packet (buff, 1, 3); |
c2a0f1cb | 931 | |
c2a0f1cb ILT |
932 | mips_initializing = 0; |
933 | ||
934 | /* If this doesn't call error, we have connected; we don't care if | |
935 | the request itself succeeds or fails. */ | |
4c6071f7 JK |
936 | mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err, |
937 | mips_receive_wait); | |
c2a0f1cb ILT |
938 | } |
939 | ||
33742334 ILT |
940 | /* Open a connection to the remote board. */ |
941 | ||
942 | static void | |
943 | mips_open (name, from_tty) | |
944 | char *name; | |
945 | int from_tty; | |
946 | { | |
33742334 ILT |
947 | if (name == 0) |
948 | error ( | |
949 | "To open a MIPS remote debugging connection, you need to specify what serial\n\ | |
950 | device is attached to the target board (e.g., /dev/ttya)."); | |
951 | ||
952 | target_preopen (from_tty); | |
953 | ||
954 | if (mips_is_open) | |
c2a0f1cb | 955 | unpush_target (&mips_ops); |
33742334 | 956 | |
1724c671 | 957 | mips_desc = SERIAL_OPEN (name); |
9a9a88c1 | 958 | if (mips_desc == (serial_t) NULL) |
33742334 ILT |
959 | perror_with_name (name); |
960 | ||
1724c671 SG |
961 | SERIAL_RAW (mips_desc); |
962 | ||
33742334 ILT |
963 | mips_is_open = 1; |
964 | ||
c2a0f1cb | 965 | mips_initialize (); |
33742334 ILT |
966 | |
967 | if (from_tty) | |
199b2450 | 968 | printf_unfiltered ("Remote MIPS debugging using %s\n", name); |
33742334 ILT |
969 | push_target (&mips_ops); /* Switch to using remote target now */ |
970 | ||
c2a0f1cb | 971 | /* FIXME: Should we call start_remote here? */ |
33742334 ILT |
972 | } |
973 | ||
974 | /* Close a connection to the remote board. */ | |
975 | ||
976 | static void | |
977 | mips_close (quitting) | |
978 | int quitting; | |
979 | { | |
980 | if (mips_is_open) | |
981 | { | |
c2a0f1cb ILT |
982 | int err; |
983 | ||
984 | mips_is_open = 0; | |
985 | ||
33742334 | 986 | /* Get the board out of remote debugging mode. */ |
4c6071f7 JK |
987 | mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err, |
988 | mips_receive_wait); | |
c2a0f1cb | 989 | |
1724c671 | 990 | SERIAL_CLOSE (mips_desc); |
33742334 ILT |
991 | } |
992 | } | |
993 | ||
994 | /* Detach from the remote board. */ | |
995 | ||
996 | static void | |
997 | mips_detach (args, from_tty) | |
998 | char *args; | |
999 | int from_tty; | |
1000 | { | |
1001 | if (args) | |
1002 | error ("Argument given to \"detach\" when remotely debugging."); | |
1003 | ||
1004 | pop_target (); | |
1005 | if (from_tty) | |
199b2450 | 1006 | printf_unfiltered ("Ending remote MIPS debugging.\n"); |
33742334 ILT |
1007 | } |
1008 | ||
1009 | /* Tell the target board to resume. This does not wait for a reply | |
1010 | from the board. */ | |
1011 | ||
1012 | static void | |
25286543 | 1013 | mips_resume (pid, step, siggnal) |
67ac9759 JK |
1014 | int pid, step; |
1015 | enum target_signal siggnal; | |
33742334 | 1016 | { |
67ac9759 JK |
1017 | if (siggnal != TARGET_SIGNAL_0) |
1018 | warning | |
1019 | ("Can't send signals to a remote system. Try `handle %s ignore'.", | |
1020 | target_signal_to_name (siggnal)); | |
33742334 ILT |
1021 | |
1022 | mips_request (step ? 's' : 'c', | |
c2a0f1cb | 1023 | (unsigned int) 1, |
33742334 | 1024 | (unsigned int) 0, |
4c6071f7 JK |
1025 | (int *) NULL, |
1026 | mips_receive_wait); | |
33742334 ILT |
1027 | } |
1028 | ||
f3fe8934 JK |
1029 | /* Return the signal corresponding to SIG, where SIG is the number which |
1030 | the MIPS protocol uses for the signal. */ | |
1031 | enum target_signal | |
1032 | mips_signal_from_protocol (sig) | |
1033 | int sig; | |
1034 | { | |
1035 | /* We allow a few more signals than the IDT board actually returns, on | |
1036 | the theory that there is at least *some* hope that perhaps the numbering | |
1037 | for these signals is widely agreed upon. */ | |
1038 | if (sig <= 0 | |
1039 | || sig > 31) | |
1040 | return TARGET_SIGNAL_UNKNOWN; | |
1041 | ||
1042 | /* Don't want to use target_signal_from_host because we are converting | |
1043 | from MIPS signal numbers, not host ones. Our internal numbers | |
1044 | match the MIPS numbers for the signals the board can return, which | |
1045 | are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */ | |
1046 | return (enum target_signal) sig; | |
1047 | } | |
1048 | ||
33742334 ILT |
1049 | /* Wait until the remote stops, and return a wait status. */ |
1050 | ||
1051 | static int | |
f7fa951f DZ |
1052 | mips_wait (pid, status) |
1053 | int pid; | |
67ac9759 | 1054 | struct target_waitstatus *status; |
33742334 ILT |
1055 | { |
1056 | int rstatus; | |
1057 | int err; | |
1058 | ||
1059 | /* If we have not sent a single step or continue command, then the | |
1060 | board is waiting for us to do something. Return a status | |
1061 | indicating that it is stopped. */ | |
1062 | if (! mips_need_reply) | |
1063 | { | |
67ac9759 JK |
1064 | status->kind = TARGET_WAITKIND_STOPPED; |
1065 | status->value.sig = TARGET_SIGNAL_TRAP; | |
33742334 ILT |
1066 | return 0; |
1067 | } | |
1068 | ||
4c6071f7 JK |
1069 | /* No timeout; we sit here as long as the program continues to execute. */ |
1070 | rstatus = mips_request ('\0', (unsigned int) 0, (unsigned int) 0, &err, -1); | |
33742334 | 1071 | if (err) |
4fb192be | 1072 | mips_error ("Remote failure: %s", safe_strerror (errno)); |
33742334 | 1073 | |
67ac9759 JK |
1074 | /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG |
1075 | and so on, because the constants we want here are determined by the | |
1076 | MIPS protocol and have nothing to do with what host we are running on. */ | |
6397809b | 1077 | if ((rstatus & 0377) == 0) |
67ac9759 JK |
1078 | { |
1079 | status->kind = TARGET_WAITKIND_EXITED; | |
1080 | status->value.integer = (((rstatus) >> 8) & 0377); | |
1081 | } | |
6397809b | 1082 | else if ((rstatus & 0377) == 0177) |
67ac9759 | 1083 | { |
5efb3899 | 1084 | status->kind = TARGET_WAITKIND_STOPPED; |
f3fe8934 | 1085 | status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0377); |
67ac9759 JK |
1086 | } |
1087 | else | |
1088 | { | |
1089 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
f3fe8934 | 1090 | status->value.sig = mips_signal_from_protocol (rstatus & 0177); |
67ac9759 | 1091 | } |
33742334 ILT |
1092 | |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | /* We have to map between the register numbers used by gdb and the | |
1097 | register numbers used by the debugging protocol. This function | |
1098 | assumes that we are using tm-mips.h. */ | |
1099 | ||
1100 | #define REGNO_OFFSET 96 | |
1101 | ||
1102 | static int | |
1103 | mips_map_regno (regno) | |
1104 | int regno; | |
1105 | { | |
1106 | if (regno < 32) | |
1107 | return regno; | |
1108 | if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) | |
1109 | return regno - FP0_REGNUM + 32; | |
1110 | switch (regno) | |
1111 | { | |
1112 | case PC_REGNUM: | |
1113 | return REGNO_OFFSET + 0; | |
1114 | case CAUSE_REGNUM: | |
1115 | return REGNO_OFFSET + 1; | |
1116 | case HI_REGNUM: | |
1117 | return REGNO_OFFSET + 2; | |
1118 | case LO_REGNUM: | |
1119 | return REGNO_OFFSET + 3; | |
1120 | case FCRCS_REGNUM: | |
1121 | return REGNO_OFFSET + 4; | |
1122 | case FCRIR_REGNUM: | |
1123 | return REGNO_OFFSET + 5; | |
1124 | default: | |
1125 | /* FIXME: Is there a way to get the status register? */ | |
1126 | return 0; | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | /* Fetch the remote registers. */ | |
1131 | ||
1132 | static void | |
1133 | mips_fetch_registers (regno) | |
1134 | int regno; | |
1135 | { | |
f4f0d174 | 1136 | unsigned LONGEST val; |
33742334 ILT |
1137 | int err; |
1138 | ||
1139 | if (regno == -1) | |
1140 | { | |
1141 | for (regno = 0; regno < NUM_REGS; regno++) | |
1142 | mips_fetch_registers (regno); | |
1143 | return; | |
1144 | } | |
1145 | ||
1146 | val = mips_request ('r', (unsigned int) mips_map_regno (regno), | |
4c6071f7 | 1147 | (unsigned int) 0, &err, mips_receive_wait); |
33742334 | 1148 | if (err) |
4fb192be | 1149 | mips_error ("Can't read register %d: %s", regno, safe_strerror (errno)); |
33742334 | 1150 | |
34df79fc JK |
1151 | { |
1152 | char buf[MAX_REGISTER_RAW_SIZE]; | |
1153 | ||
1154 | /* We got the number the register holds, but gdb expects to see a | |
1155 | value in the target byte ordering. */ | |
1156 | store_unsigned_integer (buf, REGISTER_RAW_SIZE (regno), val); | |
1157 | supply_register (regno, buf); | |
1158 | } | |
33742334 ILT |
1159 | } |
1160 | ||
1161 | /* Prepare to store registers. The MIPS protocol can store individual | |
1162 | registers, so this function doesn't have to do anything. */ | |
1163 | ||
1164 | static void | |
1165 | mips_prepare_to_store () | |
1166 | { | |
1167 | } | |
1168 | ||
1169 | /* Store remote register(s). */ | |
1170 | ||
1171 | static void | |
1172 | mips_store_registers (regno) | |
1173 | int regno; | |
1174 | { | |
1175 | int err; | |
1176 | ||
1177 | if (regno == -1) | |
1178 | { | |
1179 | for (regno = 0; regno < NUM_REGS; regno++) | |
1180 | mips_store_registers (regno); | |
1181 | return; | |
1182 | } | |
1183 | ||
1184 | mips_request ('R', (unsigned int) mips_map_regno (regno), | |
1185 | (unsigned int) read_register (regno), | |
4c6071f7 | 1186 | &err, mips_receive_wait); |
33742334 | 1187 | if (err) |
4fb192be | 1188 | mips_error ("Can't write register %d: %s", regno, safe_strerror (errno)); |
33742334 ILT |
1189 | } |
1190 | ||
1191 | /* Fetch a word from the target board. */ | |
1192 | ||
1193 | static int | |
1194 | mips_fetch_word (addr) | |
1195 | CORE_ADDR addr; | |
1196 | { | |
1197 | int val; | |
1198 | int err; | |
1199 | ||
4c6071f7 JK |
1200 | val = mips_request ('d', (unsigned int) addr, (unsigned int) 0, &err, |
1201 | mips_receive_wait); | |
33742334 ILT |
1202 | if (err) |
1203 | { | |
1204 | /* Data space failed; try instruction space. */ | |
4c6071f7 JK |
1205 | val = mips_request ('i', (unsigned int) addr, (unsigned int) 0, &err, |
1206 | mips_receive_wait); | |
33742334 | 1207 | if (err) |
4fb192be | 1208 | mips_error ("Can't read address 0x%x: %s", addr, safe_strerror (errno)); |
33742334 ILT |
1209 | } |
1210 | return val; | |
1211 | } | |
1212 | ||
1213 | /* Store a word to the target board. */ | |
1214 | ||
1215 | static void | |
1216 | mips_store_word (addr, val) | |
1217 | CORE_ADDR addr; | |
1218 | int val; | |
1219 | { | |
1220 | int err; | |
1221 | ||
4c6071f7 JK |
1222 | mips_request ('D', (unsigned int) addr, (unsigned int) val, &err, |
1223 | mips_receive_wait); | |
33742334 ILT |
1224 | if (err) |
1225 | { | |
1226 | /* Data space failed; try instruction space. */ | |
4c6071f7 JK |
1227 | mips_request ('I', (unsigned int) addr, (unsigned int) val, &err, |
1228 | mips_receive_wait); | |
33742334 | 1229 | if (err) |
4fb192be | 1230 | mips_error ("Can't write address 0x%x: %s", addr, safe_strerror (errno)); |
33742334 ILT |
1231 | } |
1232 | } | |
1233 | ||
1234 | /* Read or write LEN bytes from inferior memory at MEMADDR, | |
1235 | transferring to or from debugger address MYADDR. Write to inferior | |
1236 | if SHOULD_WRITE is nonzero. Returns length of data written or | |
1237 | read; 0 for error. Note that protocol gives us the correct value | |
1238 | for a longword, since it transfers values in ASCII. We want the | |
1239 | byte values, so we have to swap the longword values. */ | |
1240 | ||
1241 | static int | |
1242 | mips_xfer_memory (memaddr, myaddr, len, write, ignore) | |
1243 | CORE_ADDR memaddr; | |
1244 | char *myaddr; | |
1245 | int len; | |
1246 | int write; | |
1247 | struct target_ops *ignore; | |
1248 | { | |
1249 | register int i; | |
1250 | /* Round starting address down to longword boundary. */ | |
1251 | register CORE_ADDR addr = memaddr &~ 3; | |
1252 | /* Round ending address up; get number of longwords that makes. */ | |
1253 | register int count = (((memaddr + len) - addr) + 3) / 4; | |
1254 | /* Allocate buffer of that many longwords. */ | |
34df79fc | 1255 | register char *buffer = alloca (count * 4); |
33742334 ILT |
1256 | |
1257 | if (write) | |
1258 | { | |
1259 | /* Fill start and end extra bytes of buffer with existing data. */ | |
1260 | if (addr != memaddr || len < 4) | |
1261 | { | |
1262 | /* Need part of initial word -- fetch it. */ | |
34df79fc | 1263 | store_unsigned_integer (&buffer[0], 4, mips_fetch_word (addr)); |
33742334 ILT |
1264 | } |
1265 | ||
34df79fc | 1266 | if (count > 1) |
33742334 | 1267 | { |
34df79fc JK |
1268 | /* Need part of last word -- fetch it. FIXME: we do this even |
1269 | if we don't need it. */ | |
1270 | store_unsigned_integer (&buffer[(count - 1) * 4], 4, | |
1271 | mips_fetch_word (addr + (count - 1) * 4)); | |
33742334 ILT |
1272 | } |
1273 | ||
1274 | /* Copy data to be written over corresponding part of buffer */ | |
1275 | ||
1276 | memcpy ((char *) buffer + (memaddr & 3), myaddr, len); | |
1277 | ||
1278 | /* Write the entire buffer. */ | |
1279 | ||
1280 | for (i = 0; i < count; i++, addr += 4) | |
1281 | { | |
34df79fc JK |
1282 | mips_store_word (addr, extract_unsigned_integer (&buffer[i*4], 4)); |
1283 | /* FIXME: Do we want a QUIT here? */ | |
33742334 ILT |
1284 | } |
1285 | } | |
1286 | else | |
1287 | { | |
1288 | /* Read all the longwords */ | |
1289 | for (i = 0; i < count; i++, addr += 4) | |
1290 | { | |
34df79fc | 1291 | store_unsigned_integer (&buffer[i*4], 4, mips_fetch_word (addr)); |
33742334 ILT |
1292 | QUIT; |
1293 | } | |
1294 | ||
1295 | /* Copy appropriate bytes out of the buffer. */ | |
34df79fc | 1296 | memcpy (myaddr, buffer + (memaddr & 3), len); |
33742334 ILT |
1297 | } |
1298 | return len; | |
1299 | } | |
1300 | ||
1301 | /* Print info on this target. */ | |
1302 | ||
1303 | static void | |
1304 | mips_files_info (ignore) | |
1305 | struct target_ops *ignore; | |
1306 | { | |
199b2450 | 1307 | printf_unfiltered ("Debugging a MIPS board over a serial line.\n"); |
33742334 ILT |
1308 | } |
1309 | ||
c2a0f1cb ILT |
1310 | /* Kill the process running on the board. This will actually only |
1311 | work if we are doing remote debugging over the console input. I | |
1312 | think that if IDT/sim had the remote debug interrupt enabled on the | |
1313 | right port, we could interrupt the process with a break signal. */ | |
1314 | ||
1315 | static void | |
1316 | mips_kill () | |
1317 | { | |
1318 | #if 0 | |
1319 | if (mips_is_open) | |
1320 | { | |
1321 | char cc; | |
1322 | ||
1323 | /* Send a ^C. */ | |
1324 | cc = '\003'; | |
1724c671 | 1325 | SERIAL_WRITE (mips_desc, &cc, 1); |
c2a0f1cb ILT |
1326 | sleep (1); |
1327 | target_mourn_inferior (); | |
1328 | } | |
1329 | #endif | |
1330 | } | |
1331 | ||
33742334 ILT |
1332 | /* Start running on the target board. */ |
1333 | ||
1334 | static void | |
1335 | mips_create_inferior (execfile, args, env) | |
1336 | char *execfile; | |
1337 | char *args; | |
1338 | char **env; | |
1339 | { | |
1340 | CORE_ADDR entry_pt; | |
1341 | ||
33742334 | 1342 | if (args && *args) |
4fb192be | 1343 | mips_error ("Can't pass arguments to remote MIPS board."); |
33742334 ILT |
1344 | |
1345 | if (execfile == 0 || exec_bfd == 0) | |
4fb192be | 1346 | mips_error ("No exec file specified"); |
33742334 ILT |
1347 | |
1348 | entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd); | |
1349 | ||
1350 | init_wait_for_inferior (); | |
1351 | ||
c2a0f1cb ILT |
1352 | /* FIXME: Should we set inferior_pid here? */ |
1353 | ||
45dc9be3 | 1354 | proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0); |
33742334 ILT |
1355 | } |
1356 | ||
1357 | /* Clean up after a process. Actually nothing to do. */ | |
1358 | ||
1359 | static void | |
1360 | mips_mourn_inferior () | |
1361 | { | |
71607f9d | 1362 | unpush_target (&mips_ops); |
33742334 ILT |
1363 | generic_mourn_inferior (); |
1364 | } | |
1365 | \f | |
1366 | /* The target vector. */ | |
1367 | ||
1368 | struct target_ops mips_ops = | |
1369 | { | |
1370 | "mips", /* to_shortname */ | |
1371 | "Remote MIPS debugging over serial line", /* to_longname */ | |
1372 | "Debug a board using the MIPS remote debugging protocol over a serial line.\n\ | |
1373 | Specify the serial device it is connected to (e.g., /dev/ttya).", /* to_doc */ | |
1374 | mips_open, /* to_open */ | |
1375 | mips_close, /* to_close */ | |
1376 | NULL, /* to_attach */ | |
1377 | mips_detach, /* to_detach */ | |
1378 | mips_resume, /* to_resume */ | |
1379 | mips_wait, /* to_wait */ | |
1380 | mips_fetch_registers, /* to_fetch_registers */ | |
1381 | mips_store_registers, /* to_store_registers */ | |
1382 | mips_prepare_to_store, /* to_prepare_to_store */ | |
1383 | mips_xfer_memory, /* to_xfer_memory */ | |
1384 | mips_files_info, /* to_files_info */ | |
1385 | NULL, /* to_insert_breakpoint */ | |
1386 | NULL, /* to_remove_breakpoint */ | |
1387 | NULL, /* to_terminal_init */ | |
1388 | NULL, /* to_terminal_inferior */ | |
1389 | NULL, /* to_terminal_ours_for_output */ | |
1390 | NULL, /* to_terminal_ours */ | |
1391 | NULL, /* to_terminal_info */ | |
c2a0f1cb | 1392 | mips_kill, /* to_kill */ |
6b27ebe8 | 1393 | generic_load, /* to_load */ |
33742334 ILT |
1394 | NULL, /* to_lookup_symbol */ |
1395 | mips_create_inferior, /* to_create_inferior */ | |
1396 | mips_mourn_inferior, /* to_mourn_inferior */ | |
1397 | NULL, /* to_can_run */ | |
1398 | NULL, /* to_notice_signals */ | |
1399 | process_stratum, /* to_stratum */ | |
1400 | NULL, /* to_next */ | |
1401 | 1, /* to_has_all_memory */ | |
1402 | 1, /* to_has_memory */ | |
1403 | 1, /* to_has_stack */ | |
1404 | 1, /* to_has_registers */ | |
1405 | 1, /* to_has_execution */ | |
1406 | NULL, /* sections */ | |
1407 | NULL, /* sections_end */ | |
1408 | OPS_MAGIC /* to_magic */ | |
1409 | }; | |
1410 | \f | |
1411 | void | |
1412 | _initialize_remote_mips () | |
1413 | { | |
1414 | add_target (&mips_ops); | |
1415 | ||
0907dc09 ILT |
1416 | add_show_from_set ( |
1417 | add_set_cmd ("timeout", no_class, var_zinteger, | |
1418 | (char *) &mips_receive_wait, | |
1419 | "Set timeout in seconds for remote MIPS serial I/O.", | |
1420 | &setlist), | |
1421 | &showlist); | |
1422 | ||
1423 | add_show_from_set ( | |
1424 | add_set_cmd ("retransmit-timeout", no_class, var_zinteger, | |
1425 | (char *) &mips_retransmit_wait, | |
1426 | "Set retransmit timeout in seconds for remote MIPS serial I/O.\n\ | |
1427 | This is the number of seconds to wait for an acknowledgement to a packet\n\ | |
1428 | before resending the packet.", &setlist), | |
1429 | &showlist); | |
33742334 | 1430 | } |