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