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 | * | |
96 | ******************************************************************************/ | |
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" | |
113 | #include <sys/ioctl.h> | |
114 | #include <sys/file.h> | |
115 | #include <ctype.h> | |
704deef2 JK |
116 | #include "serial.h" |
117 | #if 0 | |
dd3b648e RP |
118 | #include "nindy-share/ttycntl.h" |
119 | #include "nindy-share/demux.h" | |
704deef2 | 120 | #endif |
dd3b648e RP |
121 | #include "nindy-share/env.h" |
122 | #include "nindy-share/stop.h" | |
123 | ||
124 | extern int unlink(); | |
125 | extern char *getenv(); | |
126 | extern char *mktemp(); | |
127 | ||
dd3b648e RP |
128 | extern void generic_mourn_inferior (); |
129 | ||
130 | extern struct target_ops nindy_ops; | |
dd3b648e | 131 | extern FILE *instream; |
9fa28378 | 132 | extern struct ext_format ext_format_i960; /* i960-tdep.c */ |
dd3b648e RP |
133 | |
134 | extern char ninStopWhy (); | |
135 | ||
136 | int nindy_initial_brk; /* nonzero if want to send an initial BREAK to nindy */ | |
137 | int nindy_old_protocol; /* nonzero if want to use old protocol */ | |
138 | char *nindy_ttyname; /* name of tty to talk to nindy on, or null */ | |
139 | ||
140 | #define DLE '\020' /* Character NINDY sends to indicate user program has | |
141 | * halted. */ | |
142 | #define TRUE 1 | |
143 | #define FALSE 0 | |
144 | ||
704deef2 JK |
145 | /* From nindy-share/nindy.c. */ |
146 | extern serial_t nindy_serial; | |
147 | ||
dd3b648e RP |
148 | static int have_regs = 0; /* 1 iff regs read since i960 last halted */ |
149 | static int regs_changed = 0; /* 1 iff regs were modified since last read */ | |
150 | ||
151 | extern char *exists(); | |
e4db3f3e JG |
152 | |
153 | static void | |
154 | dcache_flush (), dcache_poke (), dcache_init(); | |
155 | ||
156 | static int | |
157 | dcache_fetch (); | |
158 | ||
159 | static void | |
160 | nindy_fetch_registers PARAMS ((int)); | |
161 | ||
162 | static void | |
163 | nindy_store_registers PARAMS ((int)); | |
dd3b648e | 164 | \f |
dd3b648e RP |
165 | static char *savename; |
166 | ||
167 | static void | |
168 | nindy_close (quitting) | |
169 | int quitting; | |
170 | { | |
704deef2 JK |
171 | if (nindy_serial != NULL) |
172 | SERIAL_CLOSE (nindy_serial); | |
173 | nindy_serial = NULL; | |
dd3b648e RP |
174 | |
175 | if (savename) | |
176 | free (savename); | |
177 | savename = 0; | |
178 | } | |
179 | ||
180 | /* Open a connection to a remote debugger. | |
181 | FIXME, there should be a way to specify the various options that are | |
182 | now specified with gdb command-line options. (baud_rate, old_protocol, | |
183 | and initial_brk) */ | |
184 | void | |
185 | nindy_open (name, from_tty) | |
186 | char *name; /* "/dev/ttyXX", "ttyXX", or "XX": tty to be opened */ | |
187 | int from_tty; | |
188 | { | |
189 | ||
190 | if (!name) | |
191 | error_no_arg ("serial port device name"); | |
192 | ||
f2fc6e7a JK |
193 | target_preopen (from_tty); |
194 | ||
dd3b648e RP |
195 | nindy_close (0); |
196 | ||
704deef2 JK |
197 | have_regs = regs_changed = 0; |
198 | dcache_init(); | |
dd3b648e | 199 | |
704deef2 JK |
200 | /* Allow user to interrupt the following -- we could hang if there's |
201 | no NINDY at the other end of the remote tty. */ | |
202 | immediate_quit++; | |
203 | ninConnect(name, baud_rate ? baud_rate : "9600", | |
204 | nindy_initial_brk, !from_tty, nindy_old_protocol); | |
205 | immediate_quit--; | |
dd3b648e | 206 | |
704deef2 JK |
207 | if (nindy_serial == NULL) |
208 | { | |
209 | perror_with_name (name); | |
210 | } | |
dd3b648e | 211 | |
704deef2 JK |
212 | savename = savestring (name, strlen (name)); |
213 | push_target (&nindy_ops); | |
214 | target_fetch_registers(-1); | |
dd3b648e RP |
215 | } |
216 | ||
217 | /* User-initiated quit of nindy operations. */ | |
218 | ||
219 | static void | |
220 | nindy_detach (name, from_tty) | |
221 | char *name; | |
222 | int from_tty; | |
223 | { | |
dd3b648e RP |
224 | if (name) |
225 | error ("Too many arguments"); | |
226 | pop_target (); | |
227 | } | |
228 | ||
229 | static void | |
230 | nindy_files_info () | |
231 | { | |
232 | printf("\tAttached to %s at %s bps%s%s.\n", savename, | |
233 | baud_rate? baud_rate: "9600", | |
234 | nindy_old_protocol? " in old protocol": "", | |
235 | nindy_initial_brk? " with initial break": ""); | |
236 | } | |
237 | \f | |
6b27ebe8 JK |
238 | /* Return the number of characters in the buffer before |
239 | the first DLE character. */ | |
dd3b648e RP |
240 | |
241 | static | |
242 | int | |
243 | non_dle( buf, n ) | |
244 | char *buf; /* Character buffer; NOT '\0'-terminated */ | |
245 | int n; /* Number of characters in buffer */ | |
246 | { | |
247 | int i; | |
248 | ||
249 | for ( i = 0; i < n; i++ ){ | |
250 | if ( buf[i] == DLE ){ | |
251 | break; | |
252 | } | |
253 | } | |
254 | return i; | |
255 | } | |
256 | \f | |
257 | /* Tell the remote machine to resume. */ | |
258 | ||
259 | void | |
25286543 SG |
260 | nindy_resume (pid, step, siggnal) |
261 | int pid, step, siggnal; | |
dd3b648e RP |
262 | { |
263 | if (siggnal != 0 && siggnal != stop_signal) | |
264 | error ("Can't send signals to remote NINDY targets."); | |
265 | ||
266 | dcache_flush(); | |
267 | if ( regs_changed ){ | |
df86eb44 | 268 | nindy_store_registers (-1); |
dd3b648e RP |
269 | regs_changed = 0; |
270 | } | |
271 | have_regs = 0; | |
272 | ninGo( step ); | |
273 | } | |
704deef2 JK |
274 | \f |
275 | /* FIXME, we can probably use the normal terminal_inferior stuff here. | |
276 | We have to do terminal_inferior and then set up the passthrough | |
277 | settings initially. Thereafter, terminal_ours and terminal_inferior | |
278 | will automatically swap the settings around for us. */ | |
279 | ||
280 | struct clean_up_tty_args { | |
281 | serial_ttystate state; | |
282 | serial_t serial; | |
283 | }; | |
284 | ||
285 | static void | |
286 | clean_up_tty (ptrarg) | |
287 | PTR ptrarg; | |
288 | { | |
289 | struct clean_up_tty_args *args = (struct clean_up_tty_args *) ptrarg; | |
290 | SERIAL_SET_TTY_STATE (args->serial, args->state); | |
291 | free (args->state); | |
292 | warning ("\n\n\ | |
293 | You may need to reset the 80960 and/or reload your program.\n"); | |
294 | } | |
dd3b648e RP |
295 | |
296 | /* Wait until the remote machine stops. While waiting, operate in passthrough | |
297 | * mode; i.e., pass everything NINDY sends to stdout, and everything from | |
298 | * stdin to NINDY. | |
299 | * | |
300 | * Return to caller, storing status in 'status' just as `wait' would. | |
301 | */ | |
302 | ||
e4db3f3e | 303 | static int |
dd3b648e RP |
304 | nindy_wait( status ) |
305 | WAITTYPE *status; | |
306 | { | |
704deef2 JK |
307 | fd_set fds; |
308 | char buf[500]; /* FIXME, what is "500" here? */ | |
309 | int i, n; | |
310 | unsigned char stop_exit; | |
311 | unsigned char stop_code; | |
312 | struct clean_up_tty_args tty_args; | |
313 | struct cleanup *old_cleanups; | |
314 | long ip_value, fp_value, sp_value; /* Reg values from stop */ | |
315 | ||
316 | WSETEXIT( (*status), 0 ); | |
317 | ||
318 | /* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */ | |
319 | ||
320 | /* Save current tty attributes, and restore them when done. */ | |
321 | tty_args.serial = SERIAL_FDOPEN (0); | |
322 | tty_args.state = SERIAL_GET_TTY_STATE (tty_args.serial); | |
323 | old_cleanups = make_cleanup (clean_up_tty, &tty_args); | |
324 | ||
325 | /* Pass input from keyboard to NINDY as it arrives. NINDY will interpret | |
326 | <CR> and perform echo. */ | |
327 | /* This used to set CBREAK and clear ECHO and CRMOD. I hope this is close | |
328 | enough. */ | |
329 | SERIAL_RAW (tty_args.serial); | |
330 | ||
331 | while (1) | |
332 | { | |
333 | /* Wait for input on either the remote port or stdin. */ | |
334 | FD_ZERO (&fds); | |
335 | FD_SET (0, &fds); | |
336 | FD_SET (nindy_serial->fd, &fds); | |
337 | if (select (nindy_serial->fd + 1, &fds, 0, 0, 0) <= 0) | |
338 | continue; | |
339 | ||
340 | /* Pass input through to correct place */ | |
341 | if (FD_ISSET (0, &fds)) | |
342 | { | |
343 | /* Input on stdin */ | |
344 | n = read (0, buf, sizeof (buf)); | |
345 | if (n) | |
346 | { | |
347 | SERIAL_WRITE (nindy_serial, buf, n ); | |
348 | } | |
349 | } | |
dd3b648e | 350 | |
704deef2 JK |
351 | if (FD_ISSET (nindy_serial->fd, &fds)) |
352 | { | |
353 | /* Input on remote */ | |
354 | n = read (nindy_serial->fd, buf, sizeof (buf)); | |
355 | if (n) | |
356 | { | |
357 | /* Write out any characters in buffer preceding DLE */ | |
358 | i = non_dle( buf, n ); | |
359 | if ( i > 0 ) | |
360 | { | |
361 | write (1, buf, i); | |
dd3b648e RP |
362 | } |
363 | ||
704deef2 JK |
364 | if (i != n) |
365 | { | |
366 | /* There *was* a DLE in the buffer */ | |
367 | stop_exit = ninStopWhy(&stop_code, | |
368 | &ip_value, &fp_value, &sp_value); | |
369 | if (!stop_exit && (stop_code == STOP_SRQ)) | |
370 | { | |
371 | immediate_quit++; | |
372 | ninSrq(); | |
373 | immediate_quit--; | |
374 | } | |
375 | else | |
376 | { | |
377 | /* Get out of loop */ | |
378 | supply_register (IP_REGNUM, | |
379 | (char *)&ip_value); | |
380 | supply_register (FP_REGNUM, | |
381 | (char *)&fp_value); | |
382 | supply_register (SP_REGNUM, | |
383 | (char *)&sp_value); | |
384 | break; | |
385 | } | |
dd3b648e | 386 | } |
704deef2 | 387 | } |
dd3b648e | 388 | } |
704deef2 | 389 | } |
dd3b648e | 390 | |
704deef2 JK |
391 | do_cleanups (old_cleanups); |
392 | ||
393 | if (stop_exit) | |
394 | { | |
395 | /* User program exited */ | |
396 | WSETEXIT ((*status), stop_code); | |
397 | } | |
398 | else | |
399 | { | |
400 | /* Fault or trace */ | |
401 | switch (stop_code) | |
402 | { | |
403 | case STOP_GDB_BPT: | |
404 | case TRACE_STEP: | |
405 | /* Breakpoint or single stepping. */ | |
406 | stop_code = SIGTRAP; | |
407 | break; | |
408 | default: | |
409 | /* The target is not running Unix, and its faults/traces do | |
410 | not map nicely into Unix signals. Make sure they do not | |
411 | get confused with Unix signals by numbering them with | |
412 | values higher than the highest legal Unix signal. code | |
413 | in i960_print_fault(), called via PRINT_RANDOM_SIGNAL, | |
414 | will interpret the value. */ | |
415 | stop_code += NSIG; | |
416 | break; | |
dd3b648e | 417 | } |
704deef2 JK |
418 | WSETSTOP ((*status), stop_code); |
419 | } | |
420 | return inferior_pid; | |
dd3b648e RP |
421 | } |
422 | ||
423 | /* Read the remote registers into the block REGS. */ | |
424 | ||
425 | /* This is the block that ninRegsGet and ninRegsPut handles. */ | |
426 | struct nindy_regs { | |
427 | char local_regs[16 * 4]; | |
428 | char global_regs[16 * 4]; | |
429 | char pcw_acw[2 * 4]; | |
430 | char ip[4]; | |
431 | char tcw[4]; | |
432 | char fp_as_double[4 * 8]; | |
433 | }; | |
434 | ||
120f867e | 435 | static void |
dd3b648e RP |
436 | nindy_fetch_registers(regno) |
437 | int regno; | |
438 | { | |
439 | struct nindy_regs nindy_regs; | |
440 | int regnum, inv; | |
441 | double dub; | |
442 | ||
443 | immediate_quit++; | |
444 | ninRegsGet( (char *) &nindy_regs ); | |
445 | immediate_quit--; | |
446 | ||
704deef2 JK |
447 | memcpy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16*4); |
448 | memcpy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16*4); | |
449 | memcpy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2*4); | |
450 | memcpy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1*4); | |
451 | memcpy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1*4); | |
dd3b648e RP |
452 | for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) { |
453 | dub = unpack_double (builtin_type_double, | |
454 | &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)], | |
455 | &inv); | |
456 | /* dub now in host byte order */ | |
9fa28378 | 457 | double_to_ieee_extended (&ext_format_i960, &dub, |
dd3b648e RP |
458 | ®isters[REGISTER_BYTE (regnum)]); |
459 | } | |
460 | ||
461 | registers_fetched (); | |
dd3b648e RP |
462 | } |
463 | ||
464 | static void | |
465 | nindy_prepare_to_store() | |
466 | { | |
4ddd278f JG |
467 | /* Fetch all regs if they aren't already here. */ |
468 | read_register_bytes (0, NULL, REGISTER_BYTES); | |
dd3b648e RP |
469 | } |
470 | ||
120f867e | 471 | static void |
dd3b648e RP |
472 | nindy_store_registers(regno) |
473 | int regno; | |
474 | { | |
475 | struct nindy_regs nindy_regs; | |
476 | int regnum, inv; | |
477 | double dub; | |
478 | ||
704deef2 JK |
479 | memcpy (nindy_regs.local_regs, ®isters[REGISTER_BYTE (R0_REGNUM)], 16*4); |
480 | memcpy (nindy_regs.global_regs, ®isters[REGISTER_BYTE (G0_REGNUM)], 16*4); | |
481 | memcpy (nindy_regs.pcw_acw, ®isters[REGISTER_BYTE (PCW_REGNUM)], 2*4); | |
482 | memcpy (nindy_regs.ip, ®isters[REGISTER_BYTE (IP_REGNUM)], 1*4); | |
483 | memcpy (nindy_regs.tcw, ®isters[REGISTER_BYTE (TCW_REGNUM)], 1*4); | |
df86eb44 | 484 | /* Float regs. Only works on IEEE_FLOAT hosts. FIXME! */ |
dd3b648e | 485 | for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) { |
9fa28378 | 486 | ieee_extended_to_double (&ext_format_i960, |
dd3b648e RP |
487 | ®isters[REGISTER_BYTE (regnum)], &dub); |
488 | /* dub now in host byte order */ | |
489 | /* FIXME-someday, the arguments to unpack_double are backward. | |
490 | It expects a target double and returns a host; we pass the opposite. | |
491 | This mostly works but not quite. */ | |
df86eb44 | 492 | dub = unpack_double (builtin_type_double, (char *)&dub, &inv); |
dd3b648e | 493 | /* dub now in target byte order */ |
704deef2 | 494 | memcpy (&nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)], &dub, 8); |
dd3b648e RP |
495 | } |
496 | ||
497 | immediate_quit++; | |
498 | ninRegsPut( (char *) &nindy_regs ); | |
499 | immediate_quit--; | |
dd3b648e RP |
500 | } |
501 | ||
502 | /* Read a word from remote address ADDR and return it. | |
503 | * This goes through the data cache. | |
504 | */ | |
505 | int | |
506 | nindy_fetch_word (addr) | |
507 | CORE_ADDR addr; | |
508 | { | |
509 | return dcache_fetch (addr); | |
510 | } | |
511 | ||
512 | /* Write a word WORD into remote address ADDR. | |
513 | This goes through the data cache. */ | |
514 | ||
515 | void | |
516 | nindy_store_word (addr, word) | |
517 | CORE_ADDR addr; | |
518 | int word; | |
519 | { | |
520 | dcache_poke (addr, word); | |
521 | } | |
522 | ||
523 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
524 | to debugger memory starting at MYADDR. Copy to inferior if | |
525 | WRITE is nonzero. Returns the length copied. | |
526 | ||
527 | This is stolen almost directly from infptrace.c's child_xfer_memory, | |
528 | which also deals with a word-oriented memory interface. Sometime, | |
529 | FIXME, rewrite this to not use the word-oriented routines. */ | |
530 | ||
531 | int | |
8f1f2a72 | 532 | nindy_xfer_inferior_memory(memaddr, myaddr, len, write, target) |
dd3b648e RP |
533 | CORE_ADDR memaddr; |
534 | char *myaddr; | |
535 | int len; | |
536 | int write; | |
8f1f2a72 | 537 | struct target_ops *target; /* ignored */ |
dd3b648e RP |
538 | { |
539 | register int i; | |
540 | /* Round starting address down to longword boundary. */ | |
541 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
542 | /* Round ending address up; get number of longwords that makes. */ | |
543 | register int count | |
544 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
545 | /* Allocate buffer of that many longwords. */ | |
546 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
547 | ||
548 | if (write) | |
549 | { | |
550 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
551 | ||
552 | if (addr != memaddr || len < (int)sizeof (int)) { | |
553 | /* Need part of initial word -- fetch it. */ | |
554 | buffer[0] = nindy_fetch_word (addr); | |
555 | } | |
556 | ||
557 | if (count > 1) /* FIXME, avoid if even boundary */ | |
558 | { | |
559 | buffer[count - 1] | |
560 | = nindy_fetch_word (addr + (count - 1) * sizeof (int)); | |
561 | } | |
562 | ||
563 | /* Copy data to be written over corresponding part of buffer */ | |
564 | ||
704deef2 | 565 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
dd3b648e RP |
566 | |
567 | /* Write the entire buffer. */ | |
568 | ||
569 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
570 | { | |
571 | errno = 0; | |
572 | nindy_store_word (addr, buffer[i]); | |
573 | if (errno) | |
574 | return 0; | |
575 | } | |
576 | } | |
577 | else | |
578 | { | |
579 | /* Read all the longwords */ | |
580 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
581 | { | |
582 | errno = 0; | |
583 | buffer[i] = nindy_fetch_word (addr); | |
584 | if (errno) | |
585 | return 0; | |
586 | QUIT; | |
587 | } | |
588 | ||
589 | /* Copy appropriate bytes out of the buffer. */ | |
704deef2 | 590 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
dd3b648e RP |
591 | } |
592 | return len; | |
593 | } | |
594 | \f | |
595 | /* The data cache records all the data read from the remote machine | |
596 | since the last time it stopped. | |
597 | ||
598 | Each cache block holds 16 bytes of data | |
599 | starting at a multiple-of-16 address. */ | |
600 | ||
601 | #define DCACHE_SIZE 64 /* Number of cache blocks */ | |
602 | ||
603 | struct dcache_block { | |
604 | struct dcache_block *next, *last; | |
605 | unsigned int addr; /* Address for which data is recorded. */ | |
606 | int data[4]; | |
607 | }; | |
608 | ||
609 | struct dcache_block dcache_free, dcache_valid; | |
610 | ||
611 | /* Free all the data cache blocks, thus discarding all cached data. */ | |
612 | static | |
613 | void | |
614 | dcache_flush () | |
615 | { | |
616 | register struct dcache_block *db; | |
617 | ||
618 | while ((db = dcache_valid.next) != &dcache_valid) | |
619 | { | |
620 | remque (db); | |
621 | insque (db, &dcache_free); | |
622 | } | |
623 | } | |
624 | ||
625 | /* | |
626 | * If addr is present in the dcache, return the address of the block | |
627 | * containing it. | |
628 | */ | |
629 | static | |
630 | struct dcache_block * | |
631 | dcache_hit (addr) | |
632 | unsigned int addr; | |
633 | { | |
634 | register struct dcache_block *db; | |
635 | ||
636 | if (addr & 3) | |
637 | abort (); | |
638 | ||
639 | /* Search all cache blocks for one that is at this address. */ | |
640 | db = dcache_valid.next; | |
641 | while (db != &dcache_valid) | |
642 | { | |
643 | if ((addr & 0xfffffff0) == db->addr) | |
644 | return db; | |
645 | db = db->next; | |
646 | } | |
647 | return NULL; | |
648 | } | |
649 | ||
650 | /* Return the int data at address ADDR in dcache block DC. */ | |
651 | static | |
652 | int | |
653 | dcache_value (db, addr) | |
654 | struct dcache_block *db; | |
655 | unsigned int addr; | |
656 | { | |
657 | if (addr & 3) | |
658 | abort (); | |
659 | return (db->data[(addr>>2)&3]); | |
660 | } | |
661 | ||
662 | /* Get a free cache block, put or keep it on the valid list, | |
663 | and return its address. The caller should store into the block | |
664 | the address and data that it describes, then remque it from the | |
665 | free list and insert it into the valid list. This procedure | |
666 | prevents errors from creeping in if a ninMemGet is interrupted | |
667 | (which used to put garbage blocks in the valid list...). */ | |
668 | static | |
669 | struct dcache_block * | |
670 | dcache_alloc () | |
671 | { | |
672 | register struct dcache_block *db; | |
673 | ||
674 | if ((db = dcache_free.next) == &dcache_free) | |
675 | { | |
676 | /* If we can't get one from the free list, take last valid and put | |
677 | it on the free list. */ | |
678 | db = dcache_valid.last; | |
679 | remque (db); | |
680 | insque (db, &dcache_free); | |
681 | } | |
682 | ||
683 | remque (db); | |
684 | insque (db, &dcache_valid); | |
685 | return (db); | |
686 | } | |
687 | ||
688 | /* Return the contents of the word at address ADDR in the remote machine, | |
689 | using the data cache. */ | |
690 | static | |
691 | int | |
692 | dcache_fetch (addr) | |
693 | CORE_ADDR addr; | |
694 | { | |
695 | register struct dcache_block *db; | |
696 | ||
697 | db = dcache_hit (addr); | |
698 | if (db == 0) | |
699 | { | |
700 | db = dcache_alloc (); | |
701 | immediate_quit++; | |
702 | ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16); | |
703 | immediate_quit--; | |
704 | db->addr = addr & ~0xf; | |
705 | remque (db); /* Off the free list */ | |
706 | insque (db, &dcache_valid); /* On the valid list */ | |
707 | } | |
708 | return (dcache_value (db, addr)); | |
709 | } | |
710 | ||
711 | /* Write the word at ADDR both in the data cache and in the remote machine. */ | |
712 | static void | |
713 | dcache_poke (addr, data) | |
714 | CORE_ADDR addr; | |
715 | int data; | |
716 | { | |
717 | register struct dcache_block *db; | |
718 | ||
719 | /* First make sure the word is IN the cache. DB is its cache block. */ | |
720 | db = dcache_hit (addr); | |
721 | if (db == 0) | |
722 | { | |
723 | db = dcache_alloc (); | |
724 | immediate_quit++; | |
725 | ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16); | |
726 | immediate_quit--; | |
727 | db->addr = addr & ~0xf; | |
728 | remque (db); /* Off the free list */ | |
729 | insque (db, &dcache_valid); /* On the valid list */ | |
730 | } | |
731 | ||
732 | /* Modify the word in the cache. */ | |
733 | db->data[(addr>>2)&3] = data; | |
734 | ||
735 | /* Send the changed word. */ | |
736 | immediate_quit++; | |
737 | ninMemPut(addr, (unsigned char *)&data, 4); | |
738 | immediate_quit--; | |
739 | } | |
740 | ||
741 | /* The cache itself. */ | |
742 | struct dcache_block the_cache[DCACHE_SIZE]; | |
743 | ||
744 | /* Initialize the data cache. */ | |
745 | static void | |
746 | dcache_init () | |
747 | { | |
748 | register i; | |
749 | register struct dcache_block *db; | |
750 | ||
751 | db = the_cache; | |
752 | dcache_free.next = dcache_free.last = &dcache_free; | |
753 | dcache_valid.next = dcache_valid.last = &dcache_valid; | |
754 | for (i=0;i<DCACHE_SIZE;i++,db++) | |
755 | insque (db, &dcache_free); | |
756 | } | |
757 | ||
758 | ||
759 | static void | |
760 | nindy_create_inferior (execfile, args, env) | |
761 | char *execfile; | |
762 | char *args; | |
763 | char **env; | |
764 | { | |
765 | int entry_pt; | |
766 | int pid; | |
767 | ||
768 | if (args && *args) | |
769 | error ("Can't pass arguments to remote NINDY process"); | |
770 | ||
771 | if (execfile == 0 || exec_bfd == 0) | |
772 | error ("No exec file specified"); | |
773 | ||
774 | entry_pt = (int) bfd_get_start_address (exec_bfd); | |
775 | ||
776 | pid = 42; | |
777 | ||
778 | #ifdef CREATE_INFERIOR_HOOK | |
779 | CREATE_INFERIOR_HOOK (pid); | |
780 | #endif | |
781 | ||
782 | /* The "process" (board) is already stopped awaiting our commands, and | |
783 | the program is already downloaded. We just set its PC and go. */ | |
784 | ||
785 | inferior_pid = pid; /* Needed for wait_for_inferior below */ | |
786 | ||
787 | clear_proceed_status (); | |
788 | ||
dd3b648e RP |
789 | /* Tell wait_for_inferior that we've started a new process. */ |
790 | init_wait_for_inferior (); | |
791 | ||
792 | /* Set up the "saved terminal modes" of the inferior | |
793 | based on what modes we are starting it with. */ | |
794 | target_terminal_init (); | |
795 | ||
796 | /* Install inferior's terminal modes. */ | |
797 | target_terminal_inferior (); | |
798 | ||
dd3b648e RP |
799 | /* insert_step_breakpoint (); FIXME, do we need this? */ |
800 | proceed ((CORE_ADDR)entry_pt, -1, 0); /* Let 'er rip... */ | |
801 | } | |
802 | ||
803 | static void | |
804 | reset_command(args, from_tty) | |
805 | char *args; | |
806 | int from_tty; | |
807 | { | |
704deef2 JK |
808 | if (nindy_serial == NULL) |
809 | { | |
810 | error( "No target system to reset -- use 'target nindy' command."); | |
811 | } | |
812 | if ( query("Really reset the target system?",0,0) ) | |
813 | { | |
814 | SERIAL_SEND_BREAK (nindy_serial); | |
815 | tty_flush (nindy_serial); | |
816 | } | |
dd3b648e RP |
817 | } |
818 | ||
819 | void | |
820 | nindy_kill (args, from_tty) | |
821 | char *args; | |
822 | int from_tty; | |
823 | { | |
824 | return; /* Ignore attempts to kill target system */ | |
825 | } | |
826 | ||
827 | /* Clean up when a program exits. | |
828 | ||
829 | The program actually lives on in the remote processor's RAM, and may be | |
830 | run again without a download. Don't leave it full of breakpoint | |
831 | instructions. */ | |
832 | ||
833 | void | |
834 | nindy_mourn_inferior () | |
835 | { | |
836 | remove_breakpoints (); | |
71607f9d | 837 | unpush_target (&nindy_ops); |
dd3b648e RP |
838 | generic_mourn_inferior (); /* Do all the proper things now */ |
839 | } | |
840 | \f | |
9748446f JK |
841 | /* Pass the args the way catch_errors wants them. */ |
842 | static int | |
843 | nindy_open_stub (arg) | |
844 | char *arg; | |
845 | { | |
846 | nindy_open (arg, 1); | |
847 | return 1; | |
848 | } | |
849 | ||
850 | static int | |
851 | load_stub (arg) | |
852 | char *arg; | |
853 | { | |
854 | target_load (arg, 1); | |
855 | return 1; | |
856 | } | |
857 | ||
dd3b648e RP |
858 | /* This routine is run as a hook, just before the main command loop is |
859 | entered. If gdb is configured for the i960, but has not had its | |
860 | nindy target specified yet, this will loop prompting the user to do so. | |
861 | ||
862 | Unlike the loop provided by Intel, we actually let the user get out | |
863 | of this with a RETURN. This is useful when e.g. simply examining | |
864 | an i960 object file on the host system. */ | |
865 | ||
df86eb44 | 866 | void |
dd3b648e RP |
867 | nindy_before_main_loop () |
868 | { | |
869 | char ttyname[100]; | |
870 | char *p, *p2; | |
871 | ||
dd3b648e RP |
872 | while (current_target != &nindy_ops) { /* remote tty not specified yet */ |
873 | if ( instream == stdin ){ | |
874 | printf("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: "); | |
875 | fflush( stdout ); | |
876 | } | |
877 | fgets( ttyname, sizeof(ttyname)-1, stdin ); | |
878 | ||
879 | /* Strip leading and trailing whitespace */ | |
880 | for ( p = ttyname; isspace(*p); p++ ){ | |
881 | ; | |
882 | } | |
883 | if ( *p == '\0' ){ | |
884 | return; /* User just hit spaces or return, wants out */ | |
885 | } | |
886 | for ( p2= p; !isspace(*p2) && (*p2 != '\0'); p2++ ){ | |
887 | ; | |
888 | } | |
889 | *p2= '\0'; | |
2e4964ad | 890 | if ( STREQ("quit",p) ){ |
dd3b648e RP |
891 | exit(1); |
892 | } | |
893 | ||
9748446f JK |
894 | if (catch_errors (nindy_open_stub, p, "", RETURN_MASK_ALL)) |
895 | { | |
896 | /* Now that we have a tty open for talking to the remote machine, | |
897 | download the executable file if one was specified. */ | |
898 | if (exec_bfd) | |
899 | { | |
900 | catch_errors (load_stub, bfd_get_filename (exec_bfd), "", | |
901 | RETURN_MASK_ALL); | |
902 | } | |
903 | } | |
dd3b648e RP |
904 | } |
905 | } | |
906 | \f | |
907 | /* Define the target subroutine names */ | |
908 | ||
909 | struct target_ops nindy_ops = { | |
910 | "nindy", "Remote serial target in i960 NINDY-specific protocol", | |
f2fc6e7a JK |
911 | "Use a remote i960 system running NINDY connected by a serial line.\n\ |
912 | Specify the name of the device the serial line is connected to.\n\ | |
913 | The speed (baud rate), whether to use the old NINDY protocol,\n\ | |
914 | and whether to send a break on startup, are controlled by options\n\ | |
915 | specified when you started GDB.", | |
dd3b648e | 916 | nindy_open, nindy_close, |
58bcc08c JG |
917 | 0, |
918 | nindy_detach, | |
919 | nindy_resume, | |
920 | nindy_wait, | |
dd3b648e | 921 | nindy_fetch_registers, nindy_store_registers, |
a03d4f8e | 922 | nindy_prepare_to_store, |
dd3b648e RP |
923 | nindy_xfer_inferior_memory, nindy_files_info, |
924 | 0, 0, /* insert_breakpoint, remove_breakpoint, */ | |
925 | 0, 0, 0, 0, 0, /* Terminal crud */ | |
926 | nindy_kill, | |
6b27ebe8 | 927 | generic_load, |
dd3b648e RP |
928 | 0, /* lookup_symbol */ |
929 | nindy_create_inferior, | |
930 | nindy_mourn_inferior, | |
0256270d KR |
931 | 0, /* can_run */ |
932 | 0, /* notice_signals */ | |
dd3b648e RP |
933 | process_stratum, 0, /* next */ |
934 | 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ | |
8f1f2a72 | 935 | 0, 0, /* Section pointers */ |
dd3b648e RP |
936 | OPS_MAGIC, /* Always the last thing */ |
937 | }; | |
938 | ||
939 | void | |
940 | _initialize_nindy () | |
941 | { | |
942 | add_target (&nindy_ops); | |
943 | add_com ("reset", class_obscure, reset_command, | |
944 | "Send a 'break' to the remote target system.\n\ | |
945 | Only useful if the target has been equipped with a circuit\n\ | |
946 | to perform a hard reset when a break is detected."); | |
947 | } |