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