Commit | Line | Data |
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dd3b648e | 1 | /* Memory-access and commands for remote NINDY process, for GDB. |
58bcc08c | 2 | Copyright 1990, 1991, 1992, 1993 Free Software Foundation, Inc. |
dd3b648e RP |
3 | Contributed by Intel Corporation. Modified from remote.c by Chris Benenati. |
4 | ||
5 | GDB is distributed in the hope that it will be useful, but WITHOUT ANY | |
6 | WARRANTY. No author or distributor accepts responsibility to anyone | |
7 | for the consequences of using it or for whether it serves any | |
8 | particular purpose or works at all, unless he says so in writing. | |
9 | Refer to the GDB General Public License for full details. | |
10 | ||
11 | Everyone is granted permission to copy, modify and redistribute GDB, | |
12 | but only under the conditions described in the GDB General Public | |
13 | License. A copy of this license is supposed to have been given to you | |
14 | along with GDB so you can know your rights and responsibilities. It | |
15 | should be in a file named COPYING. Among other things, the copyright | |
16 | notice and this notice must be preserved on all copies. | |
17 | ||
18 | In other words, go ahead and share GDB, but don't try to stop | |
19 | anyone else from sharing it farther. Help stamp out software hoarding! | |
20 | */ | |
21 | ||
22 | /* | |
23 | Except for the data cache routines, this file bears little resemblence | |
24 | to remote.c. A new (although similar) protocol has been specified, and | |
25 | portions of the code are entirely dependent on having an i80960 with a | |
26 | NINDY ROM monitor at the other end of the line. | |
27 | */ | |
28 | ||
29 | /***************************************************************************** | |
30 | * | |
31 | * REMOTE COMMUNICATION PROTOCOL BETWEEN GDB960 AND THE NINDY ROM MONITOR. | |
32 | * | |
33 | * | |
34 | * MODES OF OPERATION | |
35 | * ----- -- --------- | |
36 | * | |
37 | * As far as NINDY is concerned, GDB is always in one of two modes: command | |
38 | * mode or passthrough mode. | |
39 | * | |
40 | * In command mode (the default) pre-defined packets containing requests | |
41 | * are sent by GDB to NINDY. NINDY never talks except in reponse to a request. | |
42 | * | |
43 | * Once the the user program is started, GDB enters passthrough mode, to give | |
44 | * the user program access to the terminal. GDB remains in this mode until | |
45 | * NINDY indicates that the program has stopped. | |
46 | * | |
47 | * | |
48 | * PASSTHROUGH MODE | |
49 | * ----------- ---- | |
50 | * | |
51 | * GDB writes all input received from the keyboard directly to NINDY, and writes | |
52 | * all characters received from NINDY directly to the monitor. | |
53 | * | |
54 | * Keyboard input is neither buffered nor echoed to the monitor. | |
55 | * | |
56 | * GDB remains in passthrough mode until NINDY sends a single ^P character, | |
57 | * to indicate that the user process has stopped. | |
58 | * | |
59 | * Note: | |
60 | * GDB assumes NINDY performs a 'flushreg' when the user program stops. | |
61 | * | |
62 | * | |
63 | * COMMAND MODE | |
64 | * ------- ---- | |
65 | * | |
66 | * All info (except for message ack and nak) is transferred between gdb | |
67 | * and the remote processor in messages of the following format: | |
68 | * | |
69 | * <info>#<checksum> | |
70 | * | |
71 | * where | |
72 | * # is a literal character | |
73 | * | |
74 | * <info> ASCII information; all numeric information is in the | |
75 | * form of hex digits ('0'-'9' and lowercase 'a'-'f'). | |
76 | * | |
77 | * <checksum> | |
78 | * is a pair of ASCII hex digits representing an 8-bit | |
79 | * checksum formed by adding together each of the | |
80 | * characters in <info>. | |
81 | * | |
82 | * The receiver of a message always sends a single character to the sender | |
83 | * to indicate that the checksum was good ('+') or bad ('-'); the sender | |
84 | * re-transmits the entire message over until a '+' is received. | |
85 | * | |
86 | * In response to a command NINDY always sends back either data or | |
87 | * a result code of the form "Xnn", where "nn" are hex digits and "X00" | |
88 | * means no errors. (Exceptions: the "s" and "c" commands don't respond.) | |
89 | * | |
90 | * SEE THE HEADER OF THE FILE "gdb.c" IN THE NINDY MONITOR SOURCE CODE FOR A | |
91 | * FULL DESCRIPTION OF LEGAL COMMANDS. | |
92 | * | |
93 | * SEE THE FILE "stop.h" IN THE NINDY MONITOR SOURCE CODE FOR A LIST | |
94 | * OF STOP CODES. | |
95 | * | |
6ecb870e | 96 | ***************************************************************************/ |
dd3b648e | 97 | |
d747e0af | 98 | #include "defs.h" |
dd3b648e RP |
99 | #include <signal.h> |
100 | #include <sys/types.h> | |
101 | #include <setjmp.h> | |
102 | ||
dd3b648e RP |
103 | #include "frame.h" |
104 | #include "inferior.h" | |
77641260 | 105 | #include "bfd.h" |
6b27ebe8 | 106 | #include "symfile.h" |
dd3b648e RP |
107 | #include "target.h" |
108 | #include "gdbcore.h" | |
109 | #include "command.h" | |
dd3b648e RP |
110 | #include "ieee-float.h" |
111 | ||
112 | #include "wait.h" | |
dd3b648e RP |
113 | #include <sys/file.h> |
114 | #include <ctype.h> | |
704deef2 | 115 | #include "serial.h" |
dd3b648e RP |
116 | #include "nindy-share/env.h" |
117 | #include "nindy-share/stop.h" | |
118 | ||
119 | extern int unlink(); | |
120 | extern char *getenv(); | |
121 | extern char *mktemp(); | |
122 | ||
dd3b648e RP |
123 | extern void generic_mourn_inferior (); |
124 | ||
125 | extern struct target_ops nindy_ops; | |
dd3b648e | 126 | extern FILE *instream; |
9fa28378 | 127 | extern struct ext_format ext_format_i960; /* i960-tdep.c */ |
dd3b648e RP |
128 | |
129 | extern char ninStopWhy (); | |
130 | ||
131 | int nindy_initial_brk; /* nonzero if want to send an initial BREAK to nindy */ | |
132 | int nindy_old_protocol; /* nonzero if want to use old protocol */ | |
133 | char *nindy_ttyname; /* name of tty to talk to nindy on, or null */ | |
134 | ||
135 | #define DLE '\020' /* Character NINDY sends to indicate user program has | |
136 | * halted. */ | |
137 | #define TRUE 1 | |
138 | #define FALSE 0 | |
139 | ||
704deef2 JK |
140 | /* From nindy-share/nindy.c. */ |
141 | extern serial_t nindy_serial; | |
142 | ||
dd3b648e RP |
143 | static int have_regs = 0; /* 1 iff regs read since i960 last halted */ |
144 | static int regs_changed = 0; /* 1 iff regs were modified since last read */ | |
145 | ||
146 | extern char *exists(); | |
e4db3f3e JG |
147 | |
148 | static void | |
149 | dcache_flush (), dcache_poke (), dcache_init(); | |
150 | ||
151 | static int | |
152 | dcache_fetch (); | |
153 | ||
154 | static void | |
155 | nindy_fetch_registers PARAMS ((int)); | |
156 | ||
157 | static void | |
158 | nindy_store_registers PARAMS ((int)); | |
dd3b648e | 159 | \f |
dd3b648e RP |
160 | static char *savename; |
161 | ||
162 | static void | |
163 | nindy_close (quitting) | |
164 | int quitting; | |
165 | { | |
704deef2 JK |
166 | if (nindy_serial != NULL) |
167 | SERIAL_CLOSE (nindy_serial); | |
168 | nindy_serial = NULL; | |
dd3b648e RP |
169 | |
170 | if (savename) | |
171 | free (savename); | |
172 | savename = 0; | |
173 | } | |
174 | ||
175 | /* Open a connection to a remote debugger. | |
176 | FIXME, there should be a way to specify the various options that are | |
177 | now specified with gdb command-line options. (baud_rate, old_protocol, | |
178 | and initial_brk) */ | |
179 | void | |
180 | nindy_open (name, from_tty) | |
181 | char *name; /* "/dev/ttyXX", "ttyXX", or "XX": tty to be opened */ | |
182 | int from_tty; | |
183 | { | |
184 | ||
185 | if (!name) | |
186 | error_no_arg ("serial port device name"); | |
187 | ||
f2fc6e7a JK |
188 | target_preopen (from_tty); |
189 | ||
dd3b648e RP |
190 | nindy_close (0); |
191 | ||
704deef2 JK |
192 | have_regs = regs_changed = 0; |
193 | dcache_init(); | |
dd3b648e | 194 | |
704deef2 JK |
195 | /* Allow user to interrupt the following -- we could hang if there's |
196 | no NINDY at the other end of the remote tty. */ | |
197 | immediate_quit++; | |
198 | ninConnect(name, baud_rate ? baud_rate : "9600", | |
199 | nindy_initial_brk, !from_tty, nindy_old_protocol); | |
200 | immediate_quit--; | |
dd3b648e | 201 | |
704deef2 JK |
202 | if (nindy_serial == NULL) |
203 | { | |
204 | perror_with_name (name); | |
205 | } | |
dd3b648e | 206 | |
704deef2 JK |
207 | savename = savestring (name, strlen (name)); |
208 | push_target (&nindy_ops); | |
209 | target_fetch_registers(-1); | |
dd3b648e RP |
210 | } |
211 | ||
212 | /* User-initiated quit of nindy operations. */ | |
213 | ||
214 | static void | |
215 | nindy_detach (name, from_tty) | |
216 | char *name; | |
217 | int from_tty; | |
218 | { | |
dd3b648e RP |
219 | if (name) |
220 | error ("Too many arguments"); | |
221 | pop_target (); | |
222 | } | |
223 | ||
224 | static void | |
225 | nindy_files_info () | |
226 | { | |
227 | printf("\tAttached to %s at %s bps%s%s.\n", savename, | |
228 | baud_rate? baud_rate: "9600", | |
229 | nindy_old_protocol? " in old protocol": "", | |
230 | nindy_initial_brk? " with initial break": ""); | |
231 | } | |
232 | \f | |
6b27ebe8 JK |
233 | /* Return the number of characters in the buffer before |
234 | the first DLE character. */ | |
dd3b648e RP |
235 | |
236 | static | |
237 | int | |
238 | non_dle( buf, n ) | |
239 | char *buf; /* Character buffer; NOT '\0'-terminated */ | |
240 | int n; /* Number of characters in buffer */ | |
241 | { | |
242 | int i; | |
243 | ||
244 | for ( i = 0; i < n; i++ ){ | |
245 | if ( buf[i] == DLE ){ | |
246 | break; | |
247 | } | |
248 | } | |
249 | return i; | |
250 | } | |
251 | \f | |
252 | /* Tell the remote machine to resume. */ | |
253 | ||
254 | void | |
25286543 SG |
255 | nindy_resume (pid, step, siggnal) |
256 | int pid, step, siggnal; | |
dd3b648e RP |
257 | { |
258 | if (siggnal != 0 && siggnal != stop_signal) | |
259 | error ("Can't send signals to remote NINDY targets."); | |
260 | ||
261 | dcache_flush(); | |
262 | if ( regs_changed ){ | |
df86eb44 | 263 | nindy_store_registers (-1); |
dd3b648e RP |
264 | regs_changed = 0; |
265 | } | |
266 | have_regs = 0; | |
267 | ninGo( step ); | |
268 | } | |
704deef2 JK |
269 | \f |
270 | /* FIXME, we can probably use the normal terminal_inferior stuff here. | |
271 | We have to do terminal_inferior and then set up the passthrough | |
272 | settings initially. Thereafter, terminal_ours and terminal_inferior | |
273 | will automatically swap the settings around for us. */ | |
274 | ||
275 | struct clean_up_tty_args { | |
276 | serial_ttystate state; | |
277 | serial_t serial; | |
278 | }; | |
279 | ||
280 | static void | |
281 | clean_up_tty (ptrarg) | |
282 | PTR ptrarg; | |
283 | { | |
284 | struct clean_up_tty_args *args = (struct clean_up_tty_args *) ptrarg; | |
285 | SERIAL_SET_TTY_STATE (args->serial, args->state); | |
286 | free (args->state); | |
287 | warning ("\n\n\ | |
288 | You may need to reset the 80960 and/or reload your program.\n"); | |
289 | } | |
dd3b648e RP |
290 | |
291 | /* Wait until the remote machine stops. While waiting, operate in passthrough | |
292 | * mode; i.e., pass everything NINDY sends to stdout, and everything from | |
293 | * stdin to NINDY. | |
294 | * | |
295 | * Return to caller, storing status in 'status' just as `wait' would. | |
296 | */ | |
297 | ||
e4db3f3e | 298 | static int |
dd3b648e RP |
299 | nindy_wait( status ) |
300 | WAITTYPE *status; | |
301 | { | |
704deef2 JK |
302 | fd_set fds; |
303 | char buf[500]; /* FIXME, what is "500" here? */ | |
304 | int i, n; | |
305 | unsigned char stop_exit; | |
306 | unsigned char stop_code; | |
307 | struct clean_up_tty_args tty_args; | |
308 | struct cleanup *old_cleanups; | |
309 | long ip_value, fp_value, sp_value; /* Reg values from stop */ | |
310 | ||
311 | WSETEXIT( (*status), 0 ); | |
312 | ||
313 | /* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */ | |
314 | ||
315 | /* Save current tty attributes, and restore them when done. */ | |
316 | tty_args.serial = SERIAL_FDOPEN (0); | |
317 | tty_args.state = SERIAL_GET_TTY_STATE (tty_args.serial); | |
318 | old_cleanups = make_cleanup (clean_up_tty, &tty_args); | |
319 | ||
320 | /* Pass input from keyboard to NINDY as it arrives. NINDY will interpret | |
321 | <CR> and perform echo. */ | |
322 | /* This used to set CBREAK and clear ECHO and CRMOD. I hope this is close | |
323 | enough. */ | |
324 | SERIAL_RAW (tty_args.serial); | |
325 | ||
326 | while (1) | |
327 | { | |
328 | /* Wait for input on either the remote port or stdin. */ | |
329 | FD_ZERO (&fds); | |
330 | FD_SET (0, &fds); | |
331 | FD_SET (nindy_serial->fd, &fds); | |
332 | if (select (nindy_serial->fd + 1, &fds, 0, 0, 0) <= 0) | |
333 | continue; | |
334 | ||
335 | /* Pass input through to correct place */ | |
336 | if (FD_ISSET (0, &fds)) | |
337 | { | |
338 | /* Input on stdin */ | |
339 | n = read (0, buf, sizeof (buf)); | |
340 | if (n) | |
341 | { | |
342 | SERIAL_WRITE (nindy_serial, buf, n ); | |
343 | } | |
344 | } | |
dd3b648e | 345 | |
704deef2 JK |
346 | if (FD_ISSET (nindy_serial->fd, &fds)) |
347 | { | |
348 | /* Input on remote */ | |
349 | n = read (nindy_serial->fd, buf, sizeof (buf)); | |
350 | if (n) | |
351 | { | |
352 | /* Write out any characters in buffer preceding DLE */ | |
353 | i = non_dle( buf, n ); | |
354 | if ( i > 0 ) | |
355 | { | |
356 | write (1, buf, i); | |
dd3b648e RP |
357 | } |
358 | ||
704deef2 JK |
359 | if (i != n) |
360 | { | |
361 | /* There *was* a DLE in the buffer */ | |
362 | stop_exit = ninStopWhy(&stop_code, | |
363 | &ip_value, &fp_value, &sp_value); | |
364 | if (!stop_exit && (stop_code == STOP_SRQ)) | |
365 | { | |
366 | immediate_quit++; | |
367 | ninSrq(); | |
368 | immediate_quit--; | |
369 | } | |
370 | else | |
371 | { | |
372 | /* Get out of loop */ | |
373 | supply_register (IP_REGNUM, | |
374 | (char *)&ip_value); | |
375 | supply_register (FP_REGNUM, | |
376 | (char *)&fp_value); | |
377 | supply_register (SP_REGNUM, | |
378 | (char *)&sp_value); | |
379 | break; | |
380 | } | |
dd3b648e | 381 | } |
704deef2 | 382 | } |
dd3b648e | 383 | } |
704deef2 | 384 | } |
dd3b648e | 385 | |
704deef2 JK |
386 | do_cleanups (old_cleanups); |
387 | ||
388 | if (stop_exit) | |
389 | { | |
390 | /* User program exited */ | |
391 | WSETEXIT ((*status), stop_code); | |
392 | } | |
393 | else | |
394 | { | |
395 | /* Fault or trace */ | |
396 | switch (stop_code) | |
397 | { | |
398 | case STOP_GDB_BPT: | |
399 | case TRACE_STEP: | |
400 | /* Breakpoint or single stepping. */ | |
401 | stop_code = SIGTRAP; | |
402 | break; | |
403 | default: | |
404 | /* The target is not running Unix, and its faults/traces do | |
405 | not map nicely into Unix signals. Make sure they do not | |
406 | get confused with Unix signals by numbering them with | |
407 | values higher than the highest legal Unix signal. code | |
408 | in i960_print_fault(), called via PRINT_RANDOM_SIGNAL, | |
409 | will interpret the value. */ | |
410 | stop_code += NSIG; | |
411 | break; | |
dd3b648e | 412 | } |
704deef2 JK |
413 | WSETSTOP ((*status), stop_code); |
414 | } | |
415 | return inferior_pid; | |
dd3b648e RP |
416 | } |
417 | ||
418 | /* Read the remote registers into the block REGS. */ | |
419 | ||
420 | /* This is the block that ninRegsGet and ninRegsPut handles. */ | |
421 | struct nindy_regs { | |
422 | char local_regs[16 * 4]; | |
423 | char global_regs[16 * 4]; | |
424 | char pcw_acw[2 * 4]; | |
425 | char ip[4]; | |
426 | char tcw[4]; | |
427 | char fp_as_double[4 * 8]; | |
428 | }; | |
429 | ||
120f867e | 430 | static void |
dd3b648e RP |
431 | nindy_fetch_registers(regno) |
432 | int regno; | |
433 | { | |
434 | struct nindy_regs nindy_regs; | |
435 | int regnum, inv; | |
436 | double dub; | |
437 | ||
438 | immediate_quit++; | |
439 | ninRegsGet( (char *) &nindy_regs ); | |
440 | immediate_quit--; | |
441 | ||
704deef2 JK |
442 | memcpy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16*4); |
443 | memcpy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16*4); | |
444 | memcpy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2*4); | |
445 | memcpy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1*4); | |
446 | memcpy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1*4); | |
dd3b648e RP |
447 | for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) { |
448 | dub = unpack_double (builtin_type_double, | |
449 | &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)], | |
450 | &inv); | |
451 | /* dub now in host byte order */ | |
9fa28378 | 452 | double_to_ieee_extended (&ext_format_i960, &dub, |
dd3b648e RP |
453 | ®isters[REGISTER_BYTE (regnum)]); |
454 | } | |
455 | ||
456 | registers_fetched (); | |
dd3b648e RP |
457 | } |
458 | ||
459 | static void | |
460 | nindy_prepare_to_store() | |
461 | { | |
4ddd278f JG |
462 | /* Fetch all regs if they aren't already here. */ |
463 | read_register_bytes (0, NULL, REGISTER_BYTES); | |
dd3b648e RP |
464 | } |
465 | ||
120f867e | 466 | static void |
dd3b648e RP |
467 | nindy_store_registers(regno) |
468 | int regno; | |
469 | { | |
470 | struct nindy_regs nindy_regs; | |
471 | int regnum, inv; | |
472 | double dub; | |
473 | ||
704deef2 JK |
474 | memcpy (nindy_regs.local_regs, ®isters[REGISTER_BYTE (R0_REGNUM)], 16*4); |
475 | memcpy (nindy_regs.global_regs, ®isters[REGISTER_BYTE (G0_REGNUM)], 16*4); | |
476 | memcpy (nindy_regs.pcw_acw, ®isters[REGISTER_BYTE (PCW_REGNUM)], 2*4); | |
477 | memcpy (nindy_regs.ip, ®isters[REGISTER_BYTE (IP_REGNUM)], 1*4); | |
478 | memcpy (nindy_regs.tcw, ®isters[REGISTER_BYTE (TCW_REGNUM)], 1*4); | |
df86eb44 | 479 | /* Float regs. Only works on IEEE_FLOAT hosts. FIXME! */ |
dd3b648e | 480 | for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) { |
9fa28378 | 481 | ieee_extended_to_double (&ext_format_i960, |
dd3b648e RP |
482 | ®isters[REGISTER_BYTE (regnum)], &dub); |
483 | /* dub now in host byte order */ | |
484 | /* FIXME-someday, the arguments to unpack_double are backward. | |
485 | It expects a target double and returns a host; we pass the opposite. | |
486 | This mostly works but not quite. */ | |
df86eb44 | 487 | dub = unpack_double (builtin_type_double, (char *)&dub, &inv); |
dd3b648e | 488 | /* dub now in target byte order */ |
704deef2 | 489 | memcpy (&nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)], &dub, 8); |
dd3b648e RP |
490 | } |
491 | ||
492 | immediate_quit++; | |
493 | ninRegsPut( (char *) &nindy_regs ); | |
494 | immediate_quit--; | |
dd3b648e RP |
495 | } |
496 | ||
497 | /* Read a word from remote address ADDR and return it. | |
498 | * This goes through the data cache. | |
499 | */ | |
500 | int | |
501 | nindy_fetch_word (addr) | |
502 | CORE_ADDR addr; | |
503 | { | |
504 | return dcache_fetch (addr); | |
505 | } | |
506 | ||
507 | /* Write a word WORD into remote address ADDR. | |
508 | This goes through the data cache. */ | |
509 | ||
510 | void | |
511 | nindy_store_word (addr, word) | |
512 | CORE_ADDR addr; | |
513 | int word; | |
514 | { | |
515 | dcache_poke (addr, word); | |
516 | } | |
517 | ||
518 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
519 | to debugger memory starting at MYADDR. Copy to inferior if | |
520 | WRITE is nonzero. Returns the length copied. | |
521 | ||
522 | This is stolen almost directly from infptrace.c's child_xfer_memory, | |
523 | which also deals with a word-oriented memory interface. Sometime, | |
524 | FIXME, rewrite this to not use the word-oriented routines. */ | |
525 | ||
526 | int | |
8f1f2a72 | 527 | nindy_xfer_inferior_memory(memaddr, myaddr, len, write, target) |
dd3b648e RP |
528 | CORE_ADDR memaddr; |
529 | char *myaddr; | |
530 | int len; | |
531 | int write; | |
8f1f2a72 | 532 | struct target_ops *target; /* ignored */ |
dd3b648e RP |
533 | { |
534 | register int i; | |
535 | /* Round starting address down to longword boundary. */ | |
536 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
537 | /* Round ending address up; get number of longwords that makes. */ | |
538 | register int count | |
539 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
540 | /* Allocate buffer of that many longwords. */ | |
541 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
542 | ||
543 | if (write) | |
544 | { | |
545 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
546 | ||
547 | if (addr != memaddr || len < (int)sizeof (int)) { | |
548 | /* Need part of initial word -- fetch it. */ | |
549 | buffer[0] = nindy_fetch_word (addr); | |
550 | } | |
551 | ||
552 | if (count > 1) /* FIXME, avoid if even boundary */ | |
553 | { | |
554 | buffer[count - 1] | |
555 | = nindy_fetch_word (addr + (count - 1) * sizeof (int)); | |
556 | } | |
557 | ||
558 | /* Copy data to be written over corresponding part of buffer */ | |
559 | ||
704deef2 | 560 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
dd3b648e RP |
561 | |
562 | /* Write the entire buffer. */ | |
563 | ||
564 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
565 | { | |
566 | errno = 0; | |
567 | nindy_store_word (addr, buffer[i]); | |
568 | if (errno) | |
569 | return 0; | |
570 | } | |
571 | } | |
572 | else | |
573 | { | |
574 | /* Read all the longwords */ | |
575 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
576 | { | |
577 | errno = 0; | |
578 | buffer[i] = nindy_fetch_word (addr); | |
579 | if (errno) | |
580 | return 0; | |
581 | QUIT; | |
582 | } | |
583 | ||
584 | /* Copy appropriate bytes out of the buffer. */ | |
704deef2 | 585 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
dd3b648e RP |
586 | } |
587 | return len; | |
588 | } | |
589 | \f | |
590 | /* The data cache records all the data read from the remote machine | |
591 | since the last time it stopped. | |
592 | ||
593 | Each cache block holds 16 bytes of data | |
594 | starting at a multiple-of-16 address. */ | |
595 | ||
596 | #define DCACHE_SIZE 64 /* Number of cache blocks */ | |
597 | ||
598 | struct dcache_block { | |
599 | struct dcache_block *next, *last; | |
600 | unsigned int addr; /* Address for which data is recorded. */ | |
601 | int data[4]; | |
602 | }; | |
603 | ||
604 | struct dcache_block dcache_free, dcache_valid; | |
605 | ||
606 | /* Free all the data cache blocks, thus discarding all cached data. */ | |
607 | static | |
608 | void | |
609 | dcache_flush () | |
610 | { | |
611 | register struct dcache_block *db; | |
612 | ||
613 | while ((db = dcache_valid.next) != &dcache_valid) | |
614 | { | |
615 | remque (db); | |
616 | insque (db, &dcache_free); | |
617 | } | |
618 | } | |
619 | ||
620 | /* | |
621 | * If addr is present in the dcache, return the address of the block | |
622 | * containing it. | |
623 | */ | |
624 | static | |
625 | struct dcache_block * | |
626 | dcache_hit (addr) | |
627 | unsigned int addr; | |
628 | { | |
629 | register struct dcache_block *db; | |
630 | ||
631 | if (addr & 3) | |
632 | abort (); | |
633 | ||
634 | /* Search all cache blocks for one that is at this address. */ | |
635 | db = dcache_valid.next; | |
636 | while (db != &dcache_valid) | |
637 | { | |
638 | if ((addr & 0xfffffff0) == db->addr) | |
639 | return db; | |
640 | db = db->next; | |
641 | } | |
642 | return NULL; | |
643 | } | |
644 | ||
645 | /* Return the int data at address ADDR in dcache block DC. */ | |
646 | static | |
647 | int | |
648 | dcache_value (db, addr) | |
649 | struct dcache_block *db; | |
650 | unsigned int addr; | |
651 | { | |
652 | if (addr & 3) | |
653 | abort (); | |
654 | return (db->data[(addr>>2)&3]); | |
655 | } | |
656 | ||
657 | /* Get a free cache block, put or keep it on the valid list, | |
658 | and return its address. The caller should store into the block | |
659 | the address and data that it describes, then remque it from the | |
660 | free list and insert it into the valid list. This procedure | |
661 | prevents errors from creeping in if a ninMemGet is interrupted | |
662 | (which used to put garbage blocks in the valid list...). */ | |
663 | static | |
664 | struct dcache_block * | |
665 | dcache_alloc () | |
666 | { | |
667 | register struct dcache_block *db; | |
668 | ||
669 | if ((db = dcache_free.next) == &dcache_free) | |
670 | { | |
671 | /* If we can't get one from the free list, take last valid and put | |
672 | it on the free list. */ | |
673 | db = dcache_valid.last; | |
674 | remque (db); | |
675 | insque (db, &dcache_free); | |
676 | } | |
677 | ||
678 | remque (db); | |
679 | insque (db, &dcache_valid); | |
680 | return (db); | |
681 | } | |
682 | ||
683 | /* Return the contents of the word at address ADDR in the remote machine, | |
684 | using the data cache. */ | |
685 | static | |
686 | int | |
687 | dcache_fetch (addr) | |
688 | CORE_ADDR addr; | |
689 | { | |
690 | register struct dcache_block *db; | |
691 | ||
692 | db = dcache_hit (addr); | |
693 | if (db == 0) | |
694 | { | |
695 | db = dcache_alloc (); | |
696 | immediate_quit++; | |
697 | ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16); | |
698 | immediate_quit--; | |
699 | db->addr = addr & ~0xf; | |
700 | remque (db); /* Off the free list */ | |
701 | insque (db, &dcache_valid); /* On the valid list */ | |
702 | } | |
703 | return (dcache_value (db, addr)); | |
704 | } | |
705 | ||
706 | /* Write the word at ADDR both in the data cache and in the remote machine. */ | |
707 | static void | |
708 | dcache_poke (addr, data) | |
709 | CORE_ADDR addr; | |
710 | int data; | |
711 | { | |
712 | register struct dcache_block *db; | |
713 | ||
714 | /* First make sure the word is IN the cache. DB is its cache block. */ | |
715 | db = dcache_hit (addr); | |
716 | if (db == 0) | |
717 | { | |
718 | db = dcache_alloc (); | |
719 | immediate_quit++; | |
720 | ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16); | |
721 | immediate_quit--; | |
722 | db->addr = addr & ~0xf; | |
723 | remque (db); /* Off the free list */ | |
724 | insque (db, &dcache_valid); /* On the valid list */ | |
725 | } | |
726 | ||
727 | /* Modify the word in the cache. */ | |
728 | db->data[(addr>>2)&3] = data; | |
729 | ||
730 | /* Send the changed word. */ | |
731 | immediate_quit++; | |
732 | ninMemPut(addr, (unsigned char *)&data, 4); | |
733 | immediate_quit--; | |
734 | } | |
735 | ||
736 | /* The cache itself. */ | |
737 | struct dcache_block the_cache[DCACHE_SIZE]; | |
738 | ||
739 | /* Initialize the data cache. */ | |
740 | static void | |
741 | dcache_init () | |
742 | { | |
743 | register i; | |
744 | register struct dcache_block *db; | |
745 | ||
746 | db = the_cache; | |
747 | dcache_free.next = dcache_free.last = &dcache_free; | |
748 | dcache_valid.next = dcache_valid.last = &dcache_valid; | |
749 | for (i=0;i<DCACHE_SIZE;i++,db++) | |
750 | insque (db, &dcache_free); | |
751 | } | |
752 | ||
753 | ||
754 | static void | |
755 | nindy_create_inferior (execfile, args, env) | |
756 | char *execfile; | |
757 | char *args; | |
758 | char **env; | |
759 | { | |
760 | int entry_pt; | |
761 | int pid; | |
762 | ||
763 | if (args && *args) | |
764 | error ("Can't pass arguments to remote NINDY process"); | |
765 | ||
766 | if (execfile == 0 || exec_bfd == 0) | |
767 | error ("No exec file specified"); | |
768 | ||
769 | entry_pt = (int) bfd_get_start_address (exec_bfd); | |
770 | ||
771 | pid = 42; | |
772 | ||
773 | #ifdef CREATE_INFERIOR_HOOK | |
774 | CREATE_INFERIOR_HOOK (pid); | |
775 | #endif | |
776 | ||
777 | /* The "process" (board) is already stopped awaiting our commands, and | |
778 | the program is already downloaded. We just set its PC and go. */ | |
779 | ||
780 | inferior_pid = pid; /* Needed for wait_for_inferior below */ | |
781 | ||
782 | clear_proceed_status (); | |
783 | ||
dd3b648e RP |
784 | /* Tell wait_for_inferior that we've started a new process. */ |
785 | init_wait_for_inferior (); | |
786 | ||
787 | /* Set up the "saved terminal modes" of the inferior | |
788 | based on what modes we are starting it with. */ | |
789 | target_terminal_init (); | |
790 | ||
791 | /* Install inferior's terminal modes. */ | |
792 | target_terminal_inferior (); | |
793 | ||
dd3b648e RP |
794 | /* insert_step_breakpoint (); FIXME, do we need this? */ |
795 | proceed ((CORE_ADDR)entry_pt, -1, 0); /* Let 'er rip... */ | |
796 | } | |
797 | ||
798 | static void | |
799 | reset_command(args, from_tty) | |
800 | char *args; | |
801 | int from_tty; | |
802 | { | |
704deef2 JK |
803 | if (nindy_serial == NULL) |
804 | { | |
805 | error( "No target system to reset -- use 'target nindy' command."); | |
806 | } | |
807 | if ( query("Really reset the target system?",0,0) ) | |
808 | { | |
809 | SERIAL_SEND_BREAK (nindy_serial); | |
810 | tty_flush (nindy_serial); | |
811 | } | |
dd3b648e RP |
812 | } |
813 | ||
814 | void | |
815 | nindy_kill (args, from_tty) | |
816 | char *args; | |
817 | int from_tty; | |
818 | { | |
819 | return; /* Ignore attempts to kill target system */ | |
820 | } | |
821 | ||
822 | /* Clean up when a program exits. | |
823 | ||
824 | The program actually lives on in the remote processor's RAM, and may be | |
825 | run again without a download. Don't leave it full of breakpoint | |
826 | instructions. */ | |
827 | ||
828 | void | |
829 | nindy_mourn_inferior () | |
830 | { | |
831 | remove_breakpoints (); | |
71607f9d | 832 | unpush_target (&nindy_ops); |
dd3b648e RP |
833 | generic_mourn_inferior (); /* Do all the proper things now */ |
834 | } | |
835 | \f | |
9748446f JK |
836 | /* Pass the args the way catch_errors wants them. */ |
837 | static int | |
838 | nindy_open_stub (arg) | |
839 | char *arg; | |
840 | { | |
841 | nindy_open (arg, 1); | |
842 | return 1; | |
843 | } | |
844 | ||
845 | static int | |
846 | load_stub (arg) | |
847 | char *arg; | |
848 | { | |
849 | target_load (arg, 1); | |
850 | return 1; | |
851 | } | |
852 | ||
dd3b648e RP |
853 | /* This routine is run as a hook, just before the main command loop is |
854 | entered. If gdb is configured for the i960, but has not had its | |
855 | nindy target specified yet, this will loop prompting the user to do so. | |
856 | ||
857 | Unlike the loop provided by Intel, we actually let the user get out | |
858 | of this with a RETURN. This is useful when e.g. simply examining | |
859 | an i960 object file on the host system. */ | |
860 | ||
df86eb44 | 861 | void |
dd3b648e RP |
862 | nindy_before_main_loop () |
863 | { | |
864 | char ttyname[100]; | |
865 | char *p, *p2; | |
866 | ||
dd3b648e RP |
867 | while (current_target != &nindy_ops) { /* remote tty not specified yet */ |
868 | if ( instream == stdin ){ | |
869 | printf("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: "); | |
870 | fflush( stdout ); | |
871 | } | |
872 | fgets( ttyname, sizeof(ttyname)-1, stdin ); | |
873 | ||
874 | /* Strip leading and trailing whitespace */ | |
875 | for ( p = ttyname; isspace(*p); p++ ){ | |
876 | ; | |
877 | } | |
878 | if ( *p == '\0' ){ | |
879 | return; /* User just hit spaces or return, wants out */ | |
880 | } | |
881 | for ( p2= p; !isspace(*p2) && (*p2 != '\0'); p2++ ){ | |
882 | ; | |
883 | } | |
884 | *p2= '\0'; | |
2e4964ad | 885 | if ( STREQ("quit",p) ){ |
dd3b648e RP |
886 | exit(1); |
887 | } | |
888 | ||
9748446f JK |
889 | if (catch_errors (nindy_open_stub, p, "", RETURN_MASK_ALL)) |
890 | { | |
891 | /* Now that we have a tty open for talking to the remote machine, | |
892 | download the executable file if one was specified. */ | |
893 | if (exec_bfd) | |
894 | { | |
895 | catch_errors (load_stub, bfd_get_filename (exec_bfd), "", | |
896 | RETURN_MASK_ALL); | |
897 | } | |
898 | } | |
dd3b648e RP |
899 | } |
900 | } | |
901 | \f | |
902 | /* Define the target subroutine names */ | |
903 | ||
904 | struct target_ops nindy_ops = { | |
905 | "nindy", "Remote serial target in i960 NINDY-specific protocol", | |
f2fc6e7a JK |
906 | "Use a remote i960 system running NINDY connected by a serial line.\n\ |
907 | Specify the name of the device the serial line is connected to.\n\ | |
908 | The speed (baud rate), whether to use the old NINDY protocol,\n\ | |
909 | and whether to send a break on startup, are controlled by options\n\ | |
910 | specified when you started GDB.", | |
dd3b648e | 911 | nindy_open, nindy_close, |
58bcc08c JG |
912 | 0, |
913 | nindy_detach, | |
914 | nindy_resume, | |
915 | nindy_wait, | |
dd3b648e | 916 | nindy_fetch_registers, nindy_store_registers, |
a03d4f8e | 917 | nindy_prepare_to_store, |
dd3b648e RP |
918 | nindy_xfer_inferior_memory, nindy_files_info, |
919 | 0, 0, /* insert_breakpoint, remove_breakpoint, */ | |
920 | 0, 0, 0, 0, 0, /* Terminal crud */ | |
921 | nindy_kill, | |
6b27ebe8 | 922 | generic_load, |
dd3b648e RP |
923 | 0, /* lookup_symbol */ |
924 | nindy_create_inferior, | |
925 | nindy_mourn_inferior, | |
0256270d KR |
926 | 0, /* can_run */ |
927 | 0, /* notice_signals */ | |
dd3b648e RP |
928 | process_stratum, 0, /* next */ |
929 | 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ | |
8f1f2a72 | 930 | 0, 0, /* Section pointers */ |
dd3b648e RP |
931 | OPS_MAGIC, /* Always the last thing */ |
932 | }; | |
933 | ||
934 | void | |
935 | _initialize_nindy () | |
936 | { | |
937 | add_target (&nindy_ops); | |
938 | add_com ("reset", class_obscure, reset_command, | |
939 | "Send a 'break' to the remote target system.\n\ | |
940 | Only useful if the target has been equipped with a circuit\n\ | |
941 | to perform a hard reset when a break is detected."); | |
942 | } |