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bd5635a1 RP |
1 | /* Memory-access and commands for inferior process, for GDB. |
2 | Copyright (C) 1988-1991 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | GDB is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GDB is distributed in the hope that it will be useful, | |
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 | |
17 | along with GDB; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* Remote communication protocol. | |
21 | All values are encoded in ascii hex digits. | |
22 | ||
23 | Request Packet | |
24 | ||
25 | read registers g | |
26 | reply XX....X Each byte of register data | |
27 | is described by two hex digits. | |
28 | Registers are in the internal order | |
29 | for GDB, and the bytes in a register | |
30 | are in the same order the machine uses. | |
31 | or ENN for an error. | |
32 | ||
33 | write regs GXX..XX Each byte of register data | |
34 | is described by two hex digits. | |
35 | reply OK for success | |
36 | ENN for an error | |
37 | ||
38 | read mem mAA..AA,LLLL AA..AA is address, LLLL is length. | |
39 | reply XX..XX XX..XX is mem contents | |
40 | or ENN NN is errno | |
41 | ||
42 | write mem MAA..AA,LLLL:XX..XX | |
43 | AA..AA is address, | |
44 | LLLL is number of bytes, | |
45 | XX..XX is data | |
46 | reply OK for success | |
47 | ENN for an error | |
48 | ||
49 | cont cAA..AA AA..AA is address to resume | |
50 | If AA..AA is omitted, | |
51 | resume at same address. | |
52 | ||
53 | step sAA..AA AA..AA is address to resume | |
54 | If AA..AA is omitted, | |
55 | resume at same address. | |
56 | ||
57 | last signal ? Reply the current reason for stopping. | |
58 | This is the same reply as is generated | |
59 | for step or cont : SAA where AA is the | |
60 | signal number. | |
61 | ||
62 | There is no immediate reply to step or cont. | |
63 | The reply comes when the machine stops. | |
64 | It is SAA AA is the "signal number" | |
65 | ||
66 | kill req k | |
67 | */ | |
68 | ||
69 | #include <stdio.h> | |
70 | #include <string.h> | |
71 | #include <fcntl.h> | |
72 | #include "defs.h" | |
73 | #include "param.h" | |
74 | #include "frame.h" | |
75 | #include "inferior.h" | |
76 | #include "target.h" | |
77 | #include "wait.h" | |
78 | #include "terminal.h" | |
79 | ||
80 | #ifdef USG | |
81 | #include <sys/types.h> | |
82 | #endif | |
83 | ||
84 | #include <signal.h> | |
85 | ||
86 | extern int memory_insert_breakpoint (); | |
87 | extern int memory_remove_breakpoint (); | |
88 | extern void add_syms_addr_command (); | |
89 | extern struct value *call_function_by_hand(); | |
90 | extern void start_remote (); | |
91 | ||
92 | extern struct target_ops remote_ops; /* Forward decl */ | |
93 | ||
94 | static int kiodebug; | |
95 | static int timeout = 5; | |
96 | ||
97 | #if 0 | |
98 | int icache; | |
99 | #endif | |
100 | ||
101 | /* Descriptor for I/O to remote machine. Initialize it to -1 so that | |
102 | remote_open knows that we don't have a file open when the program | |
103 | starts. */ | |
104 | int remote_desc = -1; | |
105 | ||
106 | #define PBUFSIZ 400 | |
107 | ||
108 | /* Maximum number of bytes to read/write at once. The value here | |
109 | is chosen to fill up a packet (the headers account for the 32). */ | |
110 | #define MAXBUFBYTES ((PBUFSIZ-32)/2) | |
111 | ||
112 | static void remote_send (); | |
113 | static void putpkt (); | |
114 | static void getpkt (); | |
115 | #if 0 | |
116 | static void dcache_flush (); | |
117 | #endif | |
118 | ||
119 | \f | |
120 | /* Called when SIGALRM signal sent due to alarm() timeout. */ | |
121 | #ifndef HAVE_TERMIO | |
122 | void | |
123 | remote_timer () | |
124 | { | |
125 | if (kiodebug) | |
126 | printf ("remote_timer called\n"); | |
127 | ||
128 | alarm (timeout); | |
129 | } | |
130 | #endif | |
131 | ||
132 | /* Initialize remote connection */ | |
133 | ||
134 | void | |
135 | remote_start() | |
136 | { | |
137 | } | |
138 | ||
139 | /* Clean up connection to a remote debugger. */ | |
140 | ||
e1ce8aa5 | 141 | /* ARGSUSED */ |
bd5635a1 RP |
142 | void |
143 | remote_close (quitting) | |
144 | int quitting; | |
145 | { | |
146 | if (remote_desc >= 0) | |
147 | close (remote_desc); | |
148 | remote_desc = -1; | |
149 | } | |
150 | ||
151 | /* Open a connection to a remote debugger. | |
152 | NAME is the filename used for communication. */ | |
153 | ||
154 | void | |
155 | remote_open (name, from_tty) | |
156 | char *name; | |
157 | int from_tty; | |
158 | { | |
159 | TERMINAL sg; | |
160 | ||
161 | if (name == 0) | |
162 | error ( | |
163 | "To open a remote debug connection, you need to specify what serial\n\ | |
164 | device is attached to the remote system (e.g. /dev/ttya)."); | |
165 | ||
f2fc6e7a JK |
166 | target_preopen (from_tty); |
167 | ||
bd5635a1 RP |
168 | remote_close (0); |
169 | ||
170 | #if 0 | |
171 | dcache_init (); | |
172 | #endif | |
173 | ||
174 | remote_desc = open (name, O_RDWR); | |
175 | if (remote_desc < 0) | |
176 | perror_with_name (name); | |
177 | ||
178 | ioctl (remote_desc, TIOCGETP, &sg); | |
179 | #ifdef HAVE_TERMIO | |
180 | sg.c_cc[VMIN] = 0; /* read with timeout. */ | |
181 | sg.c_cc[VTIME] = timeout * 10; | |
182 | sg.c_lflag &= ~(ICANON | ECHO); | |
183 | #else | |
184 | sg.sg_flags = RAW; | |
185 | #endif | |
186 | ioctl (remote_desc, TIOCSETP, &sg); | |
187 | ||
188 | if (from_tty) | |
189 | printf ("Remote debugging using %s\n", name); | |
190 | push_target (&remote_ops); /* Switch to using remote target now */ | |
bd5635a1 RP |
191 | |
192 | #ifndef HAVE_TERMIO | |
193 | #ifndef NO_SIGINTERRUPT | |
194 | /* Cause SIGALRM's to make reads fail. */ | |
195 | if (siginterrupt (SIGALRM, 1) != 0) | |
196 | perror ("remote_open: error in siginterrupt"); | |
197 | #endif | |
198 | ||
199 | /* Set up read timeout timer. */ | |
e1ce8aa5 | 200 | if ((void (*)()) signal (SIGALRM, remote_timer) == (void (*)()) -1) |
bd5635a1 RP |
201 | perror ("remote_open: error in signal"); |
202 | #endif | |
203 | ||
f2ebc25f JK |
204 | /* Ack any packet which the remote side has already sent. */ |
205 | write (remote_desc, "+", 1); | |
bd5635a1 | 206 | putpkt ("?"); /* initiate a query from remote machine */ |
f2ebc25f JK |
207 | |
208 | start_remote (); /* Initialize gdb process mechanisms */ | |
bd5635a1 RP |
209 | } |
210 | ||
211 | /* remote_detach() | |
212 | takes a program previously attached to and detaches it. | |
213 | We better not have left any breakpoints | |
214 | in the program or it'll die when it hits one. | |
215 | Close the open connection to the remote debugger. | |
216 | Use this when you want to detach and do something else | |
217 | with your gdb. */ | |
218 | ||
219 | static void | |
220 | remote_detach (args, from_tty) | |
221 | char *args; | |
222 | int from_tty; | |
223 | { | |
224 | if (args) | |
225 | error ("Argument given to \"detach\" when remotely debugging."); | |
226 | ||
227 | pop_target (); | |
228 | if (from_tty) | |
229 | printf ("Ending remote debugging.\n"); | |
230 | } | |
231 | ||
232 | /* Convert hex digit A to a number. */ | |
233 | ||
234 | static int | |
235 | fromhex (a) | |
236 | int a; | |
237 | { | |
238 | if (a >= '0' && a <= '9') | |
239 | return a - '0'; | |
240 | else if (a >= 'a' && a <= 'f') | |
241 | return a - 'a' + 10; | |
242 | else | |
243 | error ("Reply contains invalid hex digit"); | |
244 | return -1; | |
245 | } | |
246 | ||
247 | /* Convert number NIB to a hex digit. */ | |
248 | ||
249 | static int | |
250 | tohex (nib) | |
251 | int nib; | |
252 | { | |
253 | if (nib < 10) | |
254 | return '0'+nib; | |
255 | else | |
256 | return 'a'+nib-10; | |
257 | } | |
258 | \f | |
259 | /* Tell the remote machine to resume. */ | |
260 | ||
261 | void | |
262 | remote_resume (step, siggnal) | |
263 | int step, siggnal; | |
264 | { | |
265 | char buf[PBUFSIZ]; | |
266 | ||
267 | if (siggnal) | |
268 | error ("Can't send signals to a remote system."); | |
269 | ||
270 | #if 0 | |
271 | dcache_flush (); | |
272 | #endif | |
273 | ||
274 | strcpy (buf, step ? "s": "c"); | |
275 | ||
276 | putpkt (buf); | |
277 | } | |
278 | ||
279 | /* Wait until the remote machine stops, then return, | |
e1ce8aa5 JK |
280 | storing status in STATUS just as `wait' would. |
281 | Returns "pid" (though it's not clear what, if anything, that | |
282 | means in the case of this target). */ | |
bd5635a1 RP |
283 | |
284 | int | |
285 | remote_wait (status) | |
286 | WAITTYPE *status; | |
287 | { | |
288 | unsigned char buf[PBUFSIZ]; | |
289 | ||
290 | WSETEXIT ((*status), 0); | |
291 | getpkt (buf); | |
292 | if (buf[0] == 'E') | |
293 | error ("Remote failure reply: %s", buf); | |
294 | if (buf[0] != 'S') | |
295 | error ("Invalid remote reply: %s", buf); | |
296 | WSETSTOP ((*status), (((fromhex (buf[1])) << 4) + (fromhex (buf[2])))); | |
e1ce8aa5 | 297 | return 0; |
bd5635a1 RP |
298 | } |
299 | ||
300 | /* Read the remote registers into the block REGS. */ | |
301 | ||
e1ce8aa5 JK |
302 | /* Currently we just read all the registers, so we don't use regno. */ |
303 | /* ARGSUSED */ | |
bd5635a1 RP |
304 | int |
305 | remote_fetch_registers (regno) | |
306 | int regno; | |
307 | { | |
308 | char buf[PBUFSIZ]; | |
309 | int i; | |
310 | char *p; | |
311 | char regs[REGISTER_BYTES]; | |
312 | ||
313 | sprintf (buf, "g"); | |
314 | remote_send (buf); | |
315 | ||
316 | /* Reply describes registers byte by byte, each byte encoded as two | |
317 | hex characters. Suck them all up, then supply them to the | |
318 | register cacheing/storage mechanism. */ | |
319 | ||
320 | p = buf; | |
321 | for (i = 0; i < REGISTER_BYTES; i++) | |
322 | { | |
323 | if (p[0] == 0 || p[1] == 0) | |
324 | error ("Remote reply is too short: %s", buf); | |
325 | regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); | |
326 | p += 2; | |
327 | } | |
328 | for (i = 0; i < NUM_REGS; i++) | |
329 | supply_register (i, ®s[REGISTER_BYTE(i)]); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | /* Prepare to store registers. Since we send them all, we have to | |
334 | read out the ones we don't want to change first. */ | |
335 | ||
336 | void | |
337 | remote_prepare_to_store () | |
338 | { | |
339 | remote_fetch_registers (-1); | |
340 | } | |
341 | ||
342 | /* Store the remote registers from the contents of the block REGISTERS. | |
343 | FIXME, eventually just store one register if that's all that is needed. */ | |
344 | ||
e1ce8aa5 | 345 | /* ARGSUSED */ |
bd5635a1 RP |
346 | int |
347 | remote_store_registers (regno) | |
348 | int regno; | |
349 | { | |
350 | char buf[PBUFSIZ]; | |
351 | int i; | |
352 | char *p; | |
353 | ||
354 | buf[0] = 'G'; | |
355 | ||
356 | /* Command describes registers byte by byte, | |
357 | each byte encoded as two hex characters. */ | |
358 | ||
359 | p = buf + 1; | |
360 | for (i = 0; i < REGISTER_BYTES; i++) | |
361 | { | |
362 | *p++ = tohex ((registers[i] >> 4) & 0xf); | |
363 | *p++ = tohex (registers[i] & 0xf); | |
364 | } | |
365 | *p = '\0'; | |
366 | ||
367 | remote_send (buf); | |
368 | return 0; | |
369 | } | |
370 | ||
371 | #if 0 | |
372 | /* Read a word from remote address ADDR and return it. | |
373 | This goes through the data cache. */ | |
374 | ||
375 | int | |
376 | remote_fetch_word (addr) | |
377 | CORE_ADDR addr; | |
378 | { | |
379 | if (icache) | |
380 | { | |
381 | extern CORE_ADDR text_start, text_end; | |
382 | ||
383 | if (addr >= text_start && addr < text_end) | |
384 | { | |
385 | int buffer; | |
386 | xfer_core_file (addr, &buffer, sizeof (int)); | |
387 | return buffer; | |
388 | } | |
389 | } | |
390 | return dcache_fetch (addr); | |
391 | } | |
392 | ||
393 | /* Write a word WORD into remote address ADDR. | |
394 | This goes through the data cache. */ | |
395 | ||
396 | void | |
397 | remote_store_word (addr, word) | |
398 | CORE_ADDR addr; | |
399 | int word; | |
400 | { | |
401 | dcache_poke (addr, word); | |
402 | } | |
403 | #endif /* 0 */ | |
404 | \f | |
405 | /* Write memory data directly to the remote machine. | |
406 | This does not inform the data cache; the data cache uses this. | |
407 | MEMADDR is the address in the remote memory space. | |
408 | MYADDR is the address of the buffer in our space. | |
409 | LEN is the number of bytes. */ | |
410 | ||
411 | void | |
412 | remote_write_bytes (memaddr, myaddr, len) | |
413 | CORE_ADDR memaddr; | |
414 | char *myaddr; | |
415 | int len; | |
416 | { | |
417 | char buf[PBUFSIZ]; | |
418 | int i; | |
419 | char *p; | |
420 | ||
421 | if (len > PBUFSIZ / 2 - 20) | |
422 | abort (); | |
423 | ||
424 | sprintf (buf, "M%x,%x:", memaddr, len); | |
425 | ||
426 | /* Command describes registers byte by byte, | |
427 | each byte encoded as two hex characters. */ | |
428 | ||
429 | p = buf + strlen (buf); | |
430 | for (i = 0; i < len; i++) | |
431 | { | |
432 | *p++ = tohex ((myaddr[i] >> 4) & 0xf); | |
433 | *p++ = tohex (myaddr[i] & 0xf); | |
434 | } | |
435 | *p = '\0'; | |
436 | ||
437 | remote_send (buf); | |
438 | } | |
439 | ||
440 | /* Read memory data directly from the remote machine. | |
441 | This does not use the data cache; the data cache uses this. | |
442 | MEMADDR is the address in the remote memory space. | |
443 | MYADDR is the address of the buffer in our space. | |
444 | LEN is the number of bytes. */ | |
445 | ||
446 | void | |
447 | remote_read_bytes (memaddr, myaddr, len) | |
448 | CORE_ADDR memaddr; | |
449 | char *myaddr; | |
450 | int len; | |
451 | { | |
452 | char buf[PBUFSIZ]; | |
453 | int i; | |
454 | char *p; | |
455 | ||
456 | if (len > PBUFSIZ / 2 - 1) | |
457 | abort (); | |
458 | ||
459 | sprintf (buf, "m%x,%x", memaddr, len); | |
460 | remote_send (buf); | |
461 | ||
462 | /* Reply describes registers byte by byte, | |
463 | each byte encoded as two hex characters. */ | |
464 | ||
465 | p = buf; | |
466 | for (i = 0; i < len; i++) | |
467 | { | |
468 | if (p[0] == 0 || p[1] == 0) | |
469 | error ("Remote reply is too short: %s", buf); | |
470 | myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]); | |
471 | p += 2; | |
472 | } | |
473 | } | |
474 | \f | |
475 | /* Read or write LEN bytes from inferior memory at MEMADDR, transferring | |
e1ce8aa5 | 476 | to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is |
bd5635a1 RP |
477 | nonzero. Returns length of data written or read; 0 for error. */ |
478 | ||
479 | int | |
e1ce8aa5 | 480 | remote_xfer_inferior_memory(memaddr, myaddr, len, should_write) |
bd5635a1 RP |
481 | CORE_ADDR memaddr; |
482 | char *myaddr; | |
483 | int len; | |
e1ce8aa5 | 484 | int should_write; |
bd5635a1 RP |
485 | { |
486 | int origlen = len; | |
487 | int xfersize; | |
488 | while (len > 0) | |
489 | { | |
490 | if (len > MAXBUFBYTES) | |
491 | xfersize = MAXBUFBYTES; | |
492 | else | |
493 | xfersize = len; | |
494 | ||
e1ce8aa5 | 495 | if (should_write) |
bd5635a1 RP |
496 | remote_write_bytes(memaddr, myaddr, xfersize); |
497 | else | |
498 | remote_read_bytes (memaddr, myaddr, xfersize); | |
499 | memaddr += xfersize; | |
500 | myaddr += xfersize; | |
501 | len -= xfersize; | |
502 | } | |
503 | return origlen; /* no error possible */ | |
504 | } | |
505 | ||
506 | void | |
507 | remote_files_info () | |
508 | { | |
509 | printf ("remote files info missing here. FIXME.\n"); | |
510 | } | |
511 | \f | |
512 | /* | |
513 | ||
514 | A debug packet whose contents are <data> | |
515 | is encapsulated for transmission in the form: | |
516 | ||
517 | $ <data> # CSUM1 CSUM2 | |
518 | ||
519 | <data> must be ASCII alphanumeric and cannot include characters | |
520 | '$' or '#' | |
521 | ||
522 | CSUM1 and CSUM2 are ascii hex representation of an 8-bit | |
523 | checksum of <data>, the most significant nibble is sent first. | |
524 | the hex digits 0-9,a-f are used. | |
525 | ||
526 | Receiver responds with: | |
527 | ||
528 | + - if CSUM is correct and ready for next packet | |
529 | - - if CSUM is incorrect | |
530 | ||
531 | */ | |
532 | ||
533 | static int | |
534 | readchar () | |
535 | { | |
536 | char buf; | |
537 | ||
538 | buf = '\0'; | |
539 | #ifdef HAVE_TERMIO | |
540 | /* termio does the timeout for us. */ | |
541 | read (remote_desc, &buf, 1); | |
542 | #else | |
543 | alarm (timeout); | |
544 | read (remote_desc, &buf, 1); | |
545 | alarm (0); | |
546 | #endif | |
547 | ||
548 | return buf & 0x7f; | |
549 | } | |
550 | ||
551 | /* Send the command in BUF to the remote machine, | |
552 | and read the reply into BUF. | |
553 | Report an error if we get an error reply. */ | |
554 | ||
555 | static void | |
556 | remote_send (buf) | |
557 | char *buf; | |
558 | { | |
559 | ||
560 | putpkt (buf); | |
561 | getpkt (buf); | |
562 | ||
563 | if (buf[0] == 'E') | |
564 | error ("Remote failure reply: %s", buf); | |
565 | } | |
566 | ||
567 | /* Send a packet to the remote machine, with error checking. | |
568 | The data of the packet is in BUF. */ | |
569 | ||
570 | static void | |
571 | putpkt (buf) | |
572 | char *buf; | |
573 | { | |
574 | int i; | |
575 | unsigned char csum = 0; | |
576 | char buf2[500]; | |
577 | int cnt = strlen (buf); | |
578 | char ch; | |
579 | char *p; | |
580 | ||
581 | /* Copy the packet into buffer BUF2, encapsulating it | |
582 | and giving it a checksum. */ | |
583 | ||
584 | p = buf2; | |
585 | *p++ = '$'; | |
586 | ||
587 | for (i = 0; i < cnt; i++) | |
588 | { | |
589 | csum += buf[i]; | |
590 | *p++ = buf[i]; | |
591 | } | |
592 | *p++ = '#'; | |
593 | *p++ = tohex ((csum >> 4) & 0xf); | |
594 | *p++ = tohex (csum & 0xf); | |
595 | ||
596 | /* Send it over and over until we get a positive ack. */ | |
597 | ||
598 | do { | |
599 | if (kiodebug) | |
600 | { | |
601 | *p = '\0'; | |
602 | printf ("Sending packet: %s (%s)\n", buf2, buf); | |
603 | } | |
604 | write (remote_desc, buf2, p - buf2); | |
605 | ||
606 | /* read until either a timeout occurs (\0) or '+' is read */ | |
607 | do { | |
608 | ch = readchar (); | |
609 | } while ((ch != '+') && (ch != '\0')); | |
610 | } while (ch != '+'); | |
611 | } | |
612 | ||
613 | /* Read a packet from the remote machine, with error checking, | |
614 | and store it in BUF. */ | |
615 | ||
616 | static void | |
617 | getpkt (buf) | |
618 | char *buf; | |
619 | { | |
620 | char *bp; | |
621 | unsigned char csum; | |
622 | int c; | |
623 | unsigned char c1, c2; | |
624 | ||
eb7ba50c JK |
625 | #if 0 |
626 | /* Sorry, this will cause all hell to break loose, i.e. we'll end | |
627 | up in the command loop with an inferior, but (at least if this | |
628 | happens in remote_wait or some such place) without a current_frame, | |
629 | having set up prev_* in wait_for_inferior, etc. | |
630 | ||
631 | If it is necessary to have such an "emergency exit", seems like | |
632 | the only plausible thing to do is to say the inferior died, and | |
633 | make the user reattach if they want to. Perhaps with a prompt | |
634 | asking for confirmation. */ | |
635 | ||
bd5635a1 RP |
636 | /* allow immediate quit while reading from device, it could be hung */ |
637 | immediate_quit++; | |
eb7ba50c | 638 | #endif /* 0 */ |
bd5635a1 RP |
639 | |
640 | while (1) | |
641 | { | |
642 | /* Force csum to be zero here because of possible error retry. */ | |
643 | csum = 0; | |
644 | ||
645 | while ((c = readchar()) != '$'); | |
646 | ||
647 | bp = buf; | |
648 | while (1) | |
649 | { | |
650 | c = readchar (); | |
651 | if (c == '#') | |
652 | break; | |
653 | *bp++ = c; | |
654 | csum += c; | |
655 | } | |
656 | *bp = 0; | |
657 | ||
658 | c1 = fromhex (readchar ()); | |
659 | c2 = fromhex (readchar ()); | |
660 | if ((csum & 0xff) == (c1 << 4) + c2) | |
661 | break; | |
662 | printf ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n", | |
663 | (c1 << 4) + c2, csum & 0xff, buf); | |
664 | write (remote_desc, "-", 1); | |
665 | } | |
666 | ||
eb7ba50c | 667 | #if 0 |
bd5635a1 | 668 | immediate_quit--; |
eb7ba50c | 669 | #endif |
bd5635a1 RP |
670 | |
671 | write (remote_desc, "+", 1); | |
672 | ||
673 | if (kiodebug) | |
674 | fprintf (stderr,"Packet received :%s\n", buf); | |
675 | } | |
676 | \f | |
677 | /* The data cache leads to incorrect results because it doesn't know about | |
678 | volatile variables, thus making it impossible to debug functions which | |
679 | use hardware registers. Therefore it is #if 0'd out. Effect on | |
680 | performance is some, for backtraces of functions with a few | |
681 | arguments each. For functions with many arguments, the stack | |
682 | frames don't fit in the cache blocks, which makes the cache less | |
683 | helpful. Disabling the cache is a big performance win for fetching | |
684 | large structures, because the cache code fetched data in 16-byte | |
685 | chunks. */ | |
686 | #if 0 | |
687 | /* The data cache records all the data read from the remote machine | |
688 | since the last time it stopped. | |
689 | ||
690 | Each cache block holds 16 bytes of data | |
691 | starting at a multiple-of-16 address. */ | |
692 | ||
693 | #define DCACHE_SIZE 64 /* Number of cache blocks */ | |
694 | ||
695 | struct dcache_block { | |
696 | struct dcache_block *next, *last; | |
697 | unsigned int addr; /* Address for which data is recorded. */ | |
698 | int data[4]; | |
699 | }; | |
700 | ||
701 | struct dcache_block dcache_free, dcache_valid; | |
702 | ||
703 | /* Free all the data cache blocks, thus discarding all cached data. */ | |
704 | ||
705 | static void | |
706 | dcache_flush () | |
707 | { | |
708 | register struct dcache_block *db; | |
709 | ||
710 | while ((db = dcache_valid.next) != &dcache_valid) | |
711 | { | |
712 | remque (db); | |
713 | insque (db, &dcache_free); | |
714 | } | |
715 | } | |
716 | ||
717 | /* | |
718 | * If addr is present in the dcache, return the address of the block | |
719 | * containing it. | |
720 | */ | |
721 | ||
722 | struct dcache_block * | |
723 | dcache_hit (addr) | |
724 | { | |
725 | register struct dcache_block *db; | |
726 | ||
727 | if (addr & 3) | |
728 | abort (); | |
729 | ||
730 | /* Search all cache blocks for one that is at this address. */ | |
731 | db = dcache_valid.next; | |
732 | while (db != &dcache_valid) | |
733 | { | |
734 | if ((addr & 0xfffffff0) == db->addr) | |
735 | return db; | |
736 | db = db->next; | |
737 | } | |
738 | return NULL; | |
739 | } | |
740 | ||
741 | /* Return the int data at address ADDR in dcache block DC. */ | |
742 | ||
743 | int | |
744 | dcache_value (db, addr) | |
745 | struct dcache_block *db; | |
746 | unsigned int addr; | |
747 | { | |
748 | if (addr & 3) | |
749 | abort (); | |
750 | return (db->data[(addr>>2)&3]); | |
751 | } | |
752 | ||
753 | /* Get a free cache block, put it on the valid list, | |
754 | and return its address. The caller should store into the block | |
755 | the address and data that it describes. */ | |
756 | ||
757 | struct dcache_block * | |
758 | dcache_alloc () | |
759 | { | |
760 | register struct dcache_block *db; | |
761 | ||
762 | if ((db = dcache_free.next) == &dcache_free) | |
763 | /* If we can't get one from the free list, take last valid */ | |
764 | db = dcache_valid.last; | |
765 | ||
766 | remque (db); | |
767 | insque (db, &dcache_valid); | |
768 | return (db); | |
769 | } | |
770 | ||
771 | /* Return the contents of the word at address ADDR in the remote machine, | |
772 | using the data cache. */ | |
773 | ||
774 | int | |
775 | dcache_fetch (addr) | |
776 | CORE_ADDR addr; | |
777 | { | |
778 | register struct dcache_block *db; | |
779 | ||
780 | db = dcache_hit (addr); | |
781 | if (db == 0) | |
782 | { | |
783 | db = dcache_alloc (); | |
784 | remote_read_bytes (addr & ~0xf, db->data, 16); | |
785 | db->addr = addr & ~0xf; | |
786 | } | |
787 | return (dcache_value (db, addr)); | |
788 | } | |
789 | ||
790 | /* Write the word at ADDR both in the data cache and in the remote machine. */ | |
791 | ||
792 | dcache_poke (addr, data) | |
793 | CORE_ADDR addr; | |
794 | int data; | |
795 | { | |
796 | register struct dcache_block *db; | |
797 | ||
798 | /* First make sure the word is IN the cache. DB is its cache block. */ | |
799 | db = dcache_hit (addr); | |
800 | if (db == 0) | |
801 | { | |
802 | db = dcache_alloc (); | |
803 | remote_read_bytes (addr & ~0xf, db->data, 16); | |
804 | db->addr = addr & ~0xf; | |
805 | } | |
806 | ||
807 | /* Modify the word in the cache. */ | |
808 | db->data[(addr>>2)&3] = data; | |
809 | ||
810 | /* Send the changed word. */ | |
811 | remote_write_bytes (addr, &data, 4); | |
812 | } | |
813 | ||
814 | /* Initialize the data cache. */ | |
815 | ||
816 | dcache_init () | |
817 | { | |
818 | register i; | |
819 | register struct dcache_block *db; | |
820 | ||
821 | db = (struct dcache_block *) xmalloc (sizeof (struct dcache_block) * | |
822 | DCACHE_SIZE); | |
823 | dcache_free.next = dcache_free.last = &dcache_free; | |
824 | dcache_valid.next = dcache_valid.last = &dcache_valid; | |
825 | for (i=0;i<DCACHE_SIZE;i++,db++) | |
826 | insque (db, &dcache_free); | |
827 | } | |
828 | #endif /* 0 */ | |
829 | ||
830 | /* Define the target subroutine names */ | |
831 | ||
832 | struct target_ops remote_ops = { | |
833 | "remote", "Remote serial target in gdb-specific protocol", | |
f2fc6e7a JK |
834 | "Use a remote computer via a serial line, using a gdb-specific protocol.\n\ |
835 | Specify the serial device it is connected to (e.g. /dev/ttya).", | |
bd5635a1 RP |
836 | remote_open, remote_close, |
837 | 0, remote_detach, remote_resume, remote_wait, /* attach */ | |
838 | remote_fetch_registers, remote_store_registers, | |
839 | remote_prepare_to_store, 0, 0, /* conv_from, conv_to */ | |
840 | remote_xfer_inferior_memory, remote_files_info, | |
841 | 0, 0, /* insert_breakpoint, remove_breakpoint, */ | |
842 | 0, 0, 0, 0, 0, /* Terminal crud */ | |
843 | 0, /* kill */ | |
844 | 0, add_syms_addr_command, /* load */ | |
845 | call_function_by_hand, | |
846 | 0, /* lookup_symbol */ | |
847 | 0, 0, /* create_inferior FIXME, mourn_inferior FIXME */ | |
848 | process_stratum, 0, /* next */ | |
849 | 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ | |
850 | OPS_MAGIC, /* Always the last thing */ | |
851 | }; | |
852 | ||
853 | void | |
854 | _initialize_remote () | |
855 | { | |
856 | add_target (&remote_ops); | |
857 | } |