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dd3b648e | 1 | /* Memory-access and commands for remote NINDY process, for GDB. |
e17960fb | 2 | Copyright 1990, 1991, 1992 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" | |
105 | #include "target.h" | |
106 | #include "gdbcore.h" | |
107 | #include "command.h" | |
108 | #include "bfd.h" | |
109 | #include "ieee-float.h" | |
110 | ||
111 | #include "wait.h" | |
112 | #include <sys/ioctl.h> | |
113 | #include <sys/file.h> | |
114 | #include <ctype.h> | |
115 | #include "nindy-share/ttycntl.h" | |
116 | #include "nindy-share/demux.h" | |
117 | #include "nindy-share/env.h" | |
118 | #include "nindy-share/stop.h" | |
119 | ||
120 | extern int unlink(); | |
121 | extern char *getenv(); | |
122 | extern char *mktemp(); | |
123 | ||
124 | extern char *coffstrip(); | |
dd3b648e RP |
125 | extern void generic_mourn_inferior (); |
126 | ||
127 | extern struct target_ops nindy_ops; | |
128 | extern jmp_buf to_top_level; | |
129 | extern FILE *instream; | |
9fa28378 | 130 | extern struct ext_format ext_format_i960; /* i960-tdep.c */ |
dd3b648e RP |
131 | |
132 | extern char ninStopWhy (); | |
133 | ||
134 | int nindy_initial_brk; /* nonzero if want to send an initial BREAK to nindy */ | |
135 | int nindy_old_protocol; /* nonzero if want to use old protocol */ | |
136 | char *nindy_ttyname; /* name of tty to talk to nindy on, or null */ | |
137 | ||
138 | #define DLE '\020' /* Character NINDY sends to indicate user program has | |
139 | * halted. */ | |
140 | #define TRUE 1 | |
141 | #define FALSE 0 | |
142 | ||
143 | int nindy_fd = 0; /* Descriptor for I/O to NINDY */ | |
144 | static int have_regs = 0; /* 1 iff regs read since i960 last halted */ | |
145 | static int regs_changed = 0; /* 1 iff regs were modified since last read */ | |
146 | ||
147 | extern char *exists(); | |
148 | static void dcache_flush (), dcache_poke (), dcache_init(); | |
149 | static int dcache_fetch (); | |
150 | \f | |
151 | /* FIXME, we can probably use the normal terminal_inferior stuff here. | |
152 | We have to do terminal_inferior and then set up the passthrough | |
153 | settings initially. Thereafter, terminal_ours and terminal_inferior | |
154 | will automatically swap the settings around for us. */ | |
155 | ||
156 | /* Restore TTY to normal operation */ | |
157 | ||
158 | static TTY_STRUCT orig_tty; /* TTY attributes before entering passthrough */ | |
159 | ||
160 | static void | |
161 | restore_tty() | |
162 | { | |
163 | ioctl( 0, TIOCSETN, &orig_tty ); | |
164 | } | |
165 | ||
166 | ||
167 | /* Recover from ^Z or ^C while remote process is running */ | |
168 | ||
169 | static void (*old_ctrlc)(); /* Signal handlers before entering passthrough */ | |
170 | ||
171 | #ifdef SIGTSTP | |
172 | static void (*old_ctrlz)(); | |
173 | #endif | |
174 | ||
175 | static | |
176 | #ifdef USG | |
177 | void | |
178 | #endif | |
179 | cleanup() | |
180 | { | |
181 | restore_tty(); | |
182 | signal(SIGINT, old_ctrlc); | |
183 | #ifdef SIGTSTP | |
184 | signal(SIGTSTP, old_ctrlz); | |
185 | #endif | |
186 | error("\n\nYou may need to reset the 80960 and/or reload your program.\n"); | |
187 | } | |
188 | \f | |
189 | /* Clean up anything that needs cleaning when losing control. */ | |
190 | ||
191 | static char *savename; | |
192 | ||
193 | static void | |
194 | nindy_close (quitting) | |
195 | int quitting; | |
196 | { | |
197 | if (nindy_fd) | |
198 | close (nindy_fd); | |
199 | nindy_fd = 0; | |
200 | ||
201 | if (savename) | |
202 | free (savename); | |
203 | savename = 0; | |
204 | } | |
205 | ||
206 | /* Open a connection to a remote debugger. | |
207 | FIXME, there should be a way to specify the various options that are | |
208 | now specified with gdb command-line options. (baud_rate, old_protocol, | |
209 | and initial_brk) */ | |
210 | void | |
211 | nindy_open (name, from_tty) | |
212 | char *name; /* "/dev/ttyXX", "ttyXX", or "XX": tty to be opened */ | |
213 | int from_tty; | |
214 | { | |
215 | ||
216 | if (!name) | |
217 | error_no_arg ("serial port device name"); | |
218 | ||
f2fc6e7a JK |
219 | target_preopen (from_tty); |
220 | ||
dd3b648e RP |
221 | nindy_close (0); |
222 | ||
223 | have_regs = regs_changed = 0; | |
224 | dcache_init(); | |
225 | ||
226 | /* Allow user to interrupt the following -- we could hang if | |
227 | * there's no NINDY at the other end of the remote tty. | |
228 | */ | |
229 | immediate_quit++; | |
230 | nindy_fd = ninConnect( name, baud_rate? baud_rate: "9600", | |
231 | nindy_initial_brk, !from_tty, nindy_old_protocol ); | |
232 | immediate_quit--; | |
233 | ||
234 | if ( nindy_fd < 0 ){ | |
235 | nindy_fd = 0; | |
236 | error( "Can't open tty '%s'", name ); | |
237 | } | |
238 | ||
239 | savename = savestring (name, strlen (name)); | |
240 | push_target (&nindy_ops); | |
241 | target_fetch_registers(-1); | |
242 | } | |
243 | ||
244 | /* User-initiated quit of nindy operations. */ | |
245 | ||
246 | static void | |
247 | nindy_detach (name, from_tty) | |
248 | char *name; | |
249 | int from_tty; | |
250 | { | |
dd3b648e RP |
251 | if (name) |
252 | error ("Too many arguments"); | |
253 | pop_target (); | |
254 | } | |
255 | ||
256 | static void | |
257 | nindy_files_info () | |
258 | { | |
259 | printf("\tAttached to %s at %s bps%s%s.\n", savename, | |
260 | baud_rate? baud_rate: "9600", | |
261 | nindy_old_protocol? " in old protocol": "", | |
262 | nindy_initial_brk? " with initial break": ""); | |
263 | } | |
264 | \f | |
265 | /****************************************************************************** | |
266 | * remote_load: | |
267 | * Download an object file to the remote system by invoking the "comm960" | |
268 | * utility. We look for "comm960" in $G960BIN, $G960BASE/bin, and | |
269 | * DEFAULT_BASE/bin/HOST/bin where | |
270 | * DEFAULT_BASE is defined in env.h, and | |
271 | * HOST must be defined on the compiler invocation line. | |
272 | ******************************************************************************/ | |
273 | ||
274 | static void | |
275 | nindy_load( filename, from_tty ) | |
276 | char *filename; | |
277 | int from_tty; | |
278 | { | |
279 | char *tmpfile; | |
280 | struct cleanup *old_chain; | |
281 | char *scratch_pathname; | |
282 | int scratch_chan; | |
283 | ||
284 | if (!filename) | |
285 | filename = get_exec_file (1); | |
286 | ||
287 | filename = tilde_expand (filename); | |
288 | make_cleanup (free, filename); | |
289 | ||
290 | scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, | |
291 | &scratch_pathname); | |
292 | if (scratch_chan < 0) | |
293 | perror_with_name (filename); | |
294 | close (scratch_chan); /* Slightly wasteful FIXME */ | |
295 | ||
296 | have_regs = regs_changed = 0; | |
297 | mark_breakpoints_out(); | |
298 | inferior_pid = 0; | |
299 | dcache_flush(); | |
300 | ||
301 | tmpfile = coffstrip(scratch_pathname); | |
302 | if ( tmpfile ){ | |
1ab3bf1b | 303 | old_chain = make_cleanup (unlink,tmpfile); |
dd3b648e RP |
304 | immediate_quit++; |
305 | ninDownload( tmpfile, !from_tty ); | |
306 | /* FIXME, don't we want this merged in here? */ | |
307 | immediate_quit--; | |
308 | do_cleanups (old_chain); | |
309 | } | |
310 | } | |
311 | ||
312 | ||
313 | ||
314 | /* Return the number of characters in the buffer before the first DLE character. | |
315 | */ | |
316 | ||
317 | static | |
318 | int | |
319 | non_dle( buf, n ) | |
320 | char *buf; /* Character buffer; NOT '\0'-terminated */ | |
321 | int n; /* Number of characters in buffer */ | |
322 | { | |
323 | int i; | |
324 | ||
325 | for ( i = 0; i < n; i++ ){ | |
326 | if ( buf[i] == DLE ){ | |
327 | break; | |
328 | } | |
329 | } | |
330 | return i; | |
331 | } | |
332 | \f | |
333 | /* Tell the remote machine to resume. */ | |
334 | ||
335 | void | |
336 | nindy_resume (step, siggnal) | |
337 | int step, siggnal; | |
338 | { | |
339 | if (siggnal != 0 && siggnal != stop_signal) | |
340 | error ("Can't send signals to remote NINDY targets."); | |
341 | ||
342 | dcache_flush(); | |
343 | if ( regs_changed ){ | |
344 | nindy_store_registers (); | |
345 | regs_changed = 0; | |
346 | } | |
347 | have_regs = 0; | |
348 | ninGo( step ); | |
349 | } | |
350 | ||
351 | /* Wait until the remote machine stops. While waiting, operate in passthrough | |
352 | * mode; i.e., pass everything NINDY sends to stdout, and everything from | |
353 | * stdin to NINDY. | |
354 | * | |
355 | * Return to caller, storing status in 'status' just as `wait' would. | |
356 | */ | |
357 | ||
358 | void | |
359 | nindy_wait( status ) | |
360 | WAITTYPE *status; | |
361 | { | |
362 | DEMUX_DECL; /* OS-dependent data needed by DEMUX... macros */ | |
363 | char buf[500]; /* FIXME, what is "500" here? */ | |
364 | int i, n; | |
365 | unsigned char stop_exit; | |
366 | unsigned char stop_code; | |
367 | TTY_STRUCT tty; | |
368 | long ip_value, fp_value, sp_value; /* Reg values from stop */ | |
369 | ||
370 | ||
371 | WSETEXIT( (*status), 0 ); | |
372 | ||
373 | /* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */ | |
374 | ||
375 | /* Save current tty attributes, set up signals to restore them. | |
376 | */ | |
377 | ioctl( 0, TIOCGETP, &orig_tty ); | |
378 | old_ctrlc = signal( SIGINT, cleanup ); | |
379 | #ifdef SIGTSTP | |
380 | old_ctrlz = signal( SIGTSTP, cleanup ); | |
381 | #endif | |
382 | ||
383 | /* Pass input from keyboard to NINDY as it arrives. | |
384 | * NINDY will interpret <CR> and perform echo. | |
385 | */ | |
386 | tty = orig_tty; | |
387 | TTY_NINDYTERM( tty ); | |
388 | ioctl( 0, TIOCSETN, &tty ); | |
389 | ||
390 | while ( 1 ){ | |
391 | /* Go to sleep until there's something for us on either | |
392 | * the remote port or stdin. | |
393 | */ | |
394 | ||
395 | DEMUX_WAIT( nindy_fd ); | |
396 | ||
397 | /* Pass input through to correct place */ | |
398 | ||
399 | n = DEMUX_READ( 0, buf, sizeof(buf) ); | |
400 | if ( n ){ /* Input on stdin */ | |
401 | write( nindy_fd, buf, n ); | |
402 | } | |
403 | ||
404 | n = DEMUX_READ( nindy_fd, buf, sizeof(buf) ); | |
405 | if ( n ){ /* Input on remote */ | |
406 | /* Write out any characters in buffer preceding DLE */ | |
407 | i = non_dle( buf, n ); | |
408 | if ( i > 0 ){ | |
409 | write( 1, buf, i ); | |
410 | } | |
411 | ||
412 | if ( i != n ){ | |
413 | /* There *was* a DLE in the buffer */ | |
414 | stop_exit = ninStopWhy( &stop_code, | |
415 | &ip_value, &fp_value, &sp_value); | |
416 | if ( !stop_exit && (stop_code==STOP_SRQ) ){ | |
417 | immediate_quit++; | |
418 | ninSrq(); | |
419 | immediate_quit--; | |
420 | } else { | |
421 | /* Get out of loop */ | |
422 | supply_register (IP_REGNUM, &ip_value); | |
423 | supply_register (FP_REGNUM, &fp_value); | |
424 | supply_register (SP_REGNUM, &sp_value); | |
425 | break; | |
426 | } | |
427 | } | |
428 | } | |
429 | } | |
430 | ||
431 | signal( SIGINT, old_ctrlc ); | |
432 | #ifdef SIGTSTP | |
433 | signal( SIGTSTP, old_ctrlz ); | |
434 | #endif | |
435 | restore_tty(); | |
436 | ||
437 | if ( stop_exit ){ /* User program exited */ | |
438 | WSETEXIT( (*status), stop_code ); | |
439 | } else { /* Fault or trace */ | |
440 | switch (stop_code){ | |
441 | case STOP_GDB_BPT: | |
442 | case TRACE_STEP: | |
443 | /* Make it look like a VAX trace trap */ | |
444 | stop_code = SIGTRAP; | |
445 | break; | |
446 | default: | |
447 | /* The target is not running Unix, and its | |
448 | faults/traces do not map nicely into Unix signals. | |
449 | Make sure they do not get confused with Unix signals | |
450 | by numbering them with values higher than the highest | |
451 | legal Unix signal. code in i960_print_fault(), | |
452 | called via PRINT_RANDOM_SIGNAL, will interpret the | |
453 | value. */ | |
454 | stop_code += NSIG; | |
455 | break; | |
456 | } | |
457 | WSETSTOP( (*status), stop_code ); | |
458 | } | |
459 | } | |
460 | ||
461 | /* Read the remote registers into the block REGS. */ | |
462 | ||
463 | /* This is the block that ninRegsGet and ninRegsPut handles. */ | |
464 | struct nindy_regs { | |
465 | char local_regs[16 * 4]; | |
466 | char global_regs[16 * 4]; | |
467 | char pcw_acw[2 * 4]; | |
468 | char ip[4]; | |
469 | char tcw[4]; | |
470 | char fp_as_double[4 * 8]; | |
471 | }; | |
472 | ||
120f867e | 473 | static void |
dd3b648e RP |
474 | nindy_fetch_registers(regno) |
475 | int regno; | |
476 | { | |
477 | struct nindy_regs nindy_regs; | |
478 | int regnum, inv; | |
479 | double dub; | |
480 | ||
481 | immediate_quit++; | |
482 | ninRegsGet( (char *) &nindy_regs ); | |
483 | immediate_quit--; | |
484 | ||
485 | bcopy (nindy_regs.local_regs, ®isters[REGISTER_BYTE (R0_REGNUM)], 16*4); | |
486 | bcopy (nindy_regs.global_regs, ®isters[REGISTER_BYTE (G0_REGNUM)], 16*4); | |
487 | bcopy (nindy_regs.pcw_acw, ®isters[REGISTER_BYTE (PCW_REGNUM)], 2*4); | |
488 | bcopy (nindy_regs.ip, ®isters[REGISTER_BYTE (IP_REGNUM)], 1*4); | |
489 | bcopy (nindy_regs.tcw, ®isters[REGISTER_BYTE (TCW_REGNUM)], 1*4); | |
490 | for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) { | |
491 | dub = unpack_double (builtin_type_double, | |
492 | &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)], | |
493 | &inv); | |
494 | /* dub now in host byte order */ | |
9fa28378 | 495 | double_to_ieee_extended (&ext_format_i960, &dub, |
dd3b648e RP |
496 | ®isters[REGISTER_BYTE (regnum)]); |
497 | } | |
498 | ||
499 | registers_fetched (); | |
dd3b648e RP |
500 | } |
501 | ||
502 | static void | |
503 | nindy_prepare_to_store() | |
504 | { | |
4ddd278f JG |
505 | /* Fetch all regs if they aren't already here. */ |
506 | read_register_bytes (0, NULL, REGISTER_BYTES); | |
dd3b648e RP |
507 | } |
508 | ||
120f867e | 509 | static void |
dd3b648e RP |
510 | nindy_store_registers(regno) |
511 | int regno; | |
512 | { | |
513 | struct nindy_regs nindy_regs; | |
514 | int regnum, inv; | |
515 | double dub; | |
516 | ||
517 | bcopy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16*4); | |
518 | bcopy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16*4); | |
519 | bcopy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2*4); | |
520 | bcopy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1*4); | |
521 | bcopy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1*4); | |
522 | /* Float regs. Only works on IEEE_FLOAT hosts. */ | |
523 | for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) { | |
9fa28378 | 524 | ieee_extended_to_double (&ext_format_i960, |
dd3b648e RP |
525 | ®isters[REGISTER_BYTE (regnum)], &dub); |
526 | /* dub now in host byte order */ | |
527 | /* FIXME-someday, the arguments to unpack_double are backward. | |
528 | It expects a target double and returns a host; we pass the opposite. | |
529 | This mostly works but not quite. */ | |
530 | dub = unpack_double (builtin_type_double, &dub, &inv); | |
531 | /* dub now in target byte order */ | |
532 | bcopy ((char *)&dub, &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)], | |
533 | 8); | |
534 | } | |
535 | ||
536 | immediate_quit++; | |
537 | ninRegsPut( (char *) &nindy_regs ); | |
538 | immediate_quit--; | |
dd3b648e RP |
539 | } |
540 | ||
541 | /* Read a word from remote address ADDR and return it. | |
542 | * This goes through the data cache. | |
543 | */ | |
544 | int | |
545 | nindy_fetch_word (addr) | |
546 | CORE_ADDR addr; | |
547 | { | |
548 | return dcache_fetch (addr); | |
549 | } | |
550 | ||
551 | /* Write a word WORD into remote address ADDR. | |
552 | This goes through the data cache. */ | |
553 | ||
554 | void | |
555 | nindy_store_word (addr, word) | |
556 | CORE_ADDR addr; | |
557 | int word; | |
558 | { | |
559 | dcache_poke (addr, word); | |
560 | } | |
561 | ||
562 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
563 | to debugger memory starting at MYADDR. Copy to inferior if | |
564 | WRITE is nonzero. Returns the length copied. | |
565 | ||
566 | This is stolen almost directly from infptrace.c's child_xfer_memory, | |
567 | which also deals with a word-oriented memory interface. Sometime, | |
568 | FIXME, rewrite this to not use the word-oriented routines. */ | |
569 | ||
570 | int | |
8f1f2a72 | 571 | nindy_xfer_inferior_memory(memaddr, myaddr, len, write, target) |
dd3b648e RP |
572 | CORE_ADDR memaddr; |
573 | char *myaddr; | |
574 | int len; | |
575 | int write; | |
8f1f2a72 | 576 | struct target_ops *target; /* ignored */ |
dd3b648e RP |
577 | { |
578 | register int i; | |
579 | /* Round starting address down to longword boundary. */ | |
580 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
581 | /* Round ending address up; get number of longwords that makes. */ | |
582 | register int count | |
583 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
584 | /* Allocate buffer of that many longwords. */ | |
585 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
586 | ||
587 | if (write) | |
588 | { | |
589 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
590 | ||
591 | if (addr != memaddr || len < (int)sizeof (int)) { | |
592 | /* Need part of initial word -- fetch it. */ | |
593 | buffer[0] = nindy_fetch_word (addr); | |
594 | } | |
595 | ||
596 | if (count > 1) /* FIXME, avoid if even boundary */ | |
597 | { | |
598 | buffer[count - 1] | |
599 | = nindy_fetch_word (addr + (count - 1) * sizeof (int)); | |
600 | } | |
601 | ||
602 | /* Copy data to be written over corresponding part of buffer */ | |
603 | ||
604 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
605 | ||
606 | /* Write the entire buffer. */ | |
607 | ||
608 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
609 | { | |
610 | errno = 0; | |
611 | nindy_store_word (addr, buffer[i]); | |
612 | if (errno) | |
613 | return 0; | |
614 | } | |
615 | } | |
616 | else | |
617 | { | |
618 | /* Read all the longwords */ | |
619 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
620 | { | |
621 | errno = 0; | |
622 | buffer[i] = nindy_fetch_word (addr); | |
623 | if (errno) | |
624 | return 0; | |
625 | QUIT; | |
626 | } | |
627 | ||
628 | /* Copy appropriate bytes out of the buffer. */ | |
629 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
630 | } | |
631 | return len; | |
632 | } | |
633 | \f | |
634 | /* The data cache records all the data read from the remote machine | |
635 | since the last time it stopped. | |
636 | ||
637 | Each cache block holds 16 bytes of data | |
638 | starting at a multiple-of-16 address. */ | |
639 | ||
640 | #define DCACHE_SIZE 64 /* Number of cache blocks */ | |
641 | ||
642 | struct dcache_block { | |
643 | struct dcache_block *next, *last; | |
644 | unsigned int addr; /* Address for which data is recorded. */ | |
645 | int data[4]; | |
646 | }; | |
647 | ||
648 | struct dcache_block dcache_free, dcache_valid; | |
649 | ||
650 | /* Free all the data cache blocks, thus discarding all cached data. */ | |
651 | static | |
652 | void | |
653 | dcache_flush () | |
654 | { | |
655 | register struct dcache_block *db; | |
656 | ||
657 | while ((db = dcache_valid.next) != &dcache_valid) | |
658 | { | |
659 | remque (db); | |
660 | insque (db, &dcache_free); | |
661 | } | |
662 | } | |
663 | ||
664 | /* | |
665 | * If addr is present in the dcache, return the address of the block | |
666 | * containing it. | |
667 | */ | |
668 | static | |
669 | struct dcache_block * | |
670 | dcache_hit (addr) | |
671 | unsigned int addr; | |
672 | { | |
673 | register struct dcache_block *db; | |
674 | ||
675 | if (addr & 3) | |
676 | abort (); | |
677 | ||
678 | /* Search all cache blocks for one that is at this address. */ | |
679 | db = dcache_valid.next; | |
680 | while (db != &dcache_valid) | |
681 | { | |
682 | if ((addr & 0xfffffff0) == db->addr) | |
683 | return db; | |
684 | db = db->next; | |
685 | } | |
686 | return NULL; | |
687 | } | |
688 | ||
689 | /* Return the int data at address ADDR in dcache block DC. */ | |
690 | static | |
691 | int | |
692 | dcache_value (db, addr) | |
693 | struct dcache_block *db; | |
694 | unsigned int addr; | |
695 | { | |
696 | if (addr & 3) | |
697 | abort (); | |
698 | return (db->data[(addr>>2)&3]); | |
699 | } | |
700 | ||
701 | /* Get a free cache block, put or keep it on the valid list, | |
702 | and return its address. The caller should store into the block | |
703 | the address and data that it describes, then remque it from the | |
704 | free list and insert it into the valid list. This procedure | |
705 | prevents errors from creeping in if a ninMemGet is interrupted | |
706 | (which used to put garbage blocks in the valid list...). */ | |
707 | static | |
708 | struct dcache_block * | |
709 | dcache_alloc () | |
710 | { | |
711 | register struct dcache_block *db; | |
712 | ||
713 | if ((db = dcache_free.next) == &dcache_free) | |
714 | { | |
715 | /* If we can't get one from the free list, take last valid and put | |
716 | it on the free list. */ | |
717 | db = dcache_valid.last; | |
718 | remque (db); | |
719 | insque (db, &dcache_free); | |
720 | } | |
721 | ||
722 | remque (db); | |
723 | insque (db, &dcache_valid); | |
724 | return (db); | |
725 | } | |
726 | ||
727 | /* Return the contents of the word at address ADDR in the remote machine, | |
728 | using the data cache. */ | |
729 | static | |
730 | int | |
731 | dcache_fetch (addr) | |
732 | CORE_ADDR addr; | |
733 | { | |
734 | register struct dcache_block *db; | |
735 | ||
736 | db = dcache_hit (addr); | |
737 | if (db == 0) | |
738 | { | |
739 | db = dcache_alloc (); | |
740 | immediate_quit++; | |
741 | ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16); | |
742 | immediate_quit--; | |
743 | db->addr = addr & ~0xf; | |
744 | remque (db); /* Off the free list */ | |
745 | insque (db, &dcache_valid); /* On the valid list */ | |
746 | } | |
747 | return (dcache_value (db, addr)); | |
748 | } | |
749 | ||
750 | /* Write the word at ADDR both in the data cache and in the remote machine. */ | |
751 | static void | |
752 | dcache_poke (addr, data) | |
753 | CORE_ADDR addr; | |
754 | int data; | |
755 | { | |
756 | register struct dcache_block *db; | |
757 | ||
758 | /* First make sure the word is IN the cache. DB is its cache block. */ | |
759 | db = dcache_hit (addr); | |
760 | if (db == 0) | |
761 | { | |
762 | db = dcache_alloc (); | |
763 | immediate_quit++; | |
764 | ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16); | |
765 | immediate_quit--; | |
766 | db->addr = addr & ~0xf; | |
767 | remque (db); /* Off the free list */ | |
768 | insque (db, &dcache_valid); /* On the valid list */ | |
769 | } | |
770 | ||
771 | /* Modify the word in the cache. */ | |
772 | db->data[(addr>>2)&3] = data; | |
773 | ||
774 | /* Send the changed word. */ | |
775 | immediate_quit++; | |
776 | ninMemPut(addr, (unsigned char *)&data, 4); | |
777 | immediate_quit--; | |
778 | } | |
779 | ||
780 | /* The cache itself. */ | |
781 | struct dcache_block the_cache[DCACHE_SIZE]; | |
782 | ||
783 | /* Initialize the data cache. */ | |
784 | static void | |
785 | dcache_init () | |
786 | { | |
787 | register i; | |
788 | register struct dcache_block *db; | |
789 | ||
790 | db = the_cache; | |
791 | dcache_free.next = dcache_free.last = &dcache_free; | |
792 | dcache_valid.next = dcache_valid.last = &dcache_valid; | |
793 | for (i=0;i<DCACHE_SIZE;i++,db++) | |
794 | insque (db, &dcache_free); | |
795 | } | |
796 | ||
797 | ||
798 | static void | |
799 | nindy_create_inferior (execfile, args, env) | |
800 | char *execfile; | |
801 | char *args; | |
802 | char **env; | |
803 | { | |
804 | int entry_pt; | |
805 | int pid; | |
806 | ||
807 | if (args && *args) | |
808 | error ("Can't pass arguments to remote NINDY process"); | |
809 | ||
810 | if (execfile == 0 || exec_bfd == 0) | |
811 | error ("No exec file specified"); | |
812 | ||
813 | entry_pt = (int) bfd_get_start_address (exec_bfd); | |
814 | ||
815 | pid = 42; | |
816 | ||
817 | #ifdef CREATE_INFERIOR_HOOK | |
818 | CREATE_INFERIOR_HOOK (pid); | |
819 | #endif | |
820 | ||
821 | /* The "process" (board) is already stopped awaiting our commands, and | |
822 | the program is already downloaded. We just set its PC and go. */ | |
823 | ||
824 | inferior_pid = pid; /* Needed for wait_for_inferior below */ | |
825 | ||
826 | clear_proceed_status (); | |
827 | ||
dd3b648e RP |
828 | /* Tell wait_for_inferior that we've started a new process. */ |
829 | init_wait_for_inferior (); | |
830 | ||
831 | /* Set up the "saved terminal modes" of the inferior | |
832 | based on what modes we are starting it with. */ | |
833 | target_terminal_init (); | |
834 | ||
835 | /* Install inferior's terminal modes. */ | |
836 | target_terminal_inferior (); | |
837 | ||
dd3b648e RP |
838 | /* insert_step_breakpoint (); FIXME, do we need this? */ |
839 | proceed ((CORE_ADDR)entry_pt, -1, 0); /* Let 'er rip... */ | |
840 | } | |
841 | ||
842 | static void | |
843 | reset_command(args, from_tty) | |
844 | char *args; | |
845 | int from_tty; | |
846 | { | |
847 | if ( !nindy_fd ){ | |
848 | error( "No target system to reset -- use 'target nindy' command."); | |
849 | } | |
850 | if ( query("Really reset the target system?",0,0) ){ | |
851 | send_break( nindy_fd ); | |
852 | tty_flush( nindy_fd ); | |
853 | } | |
854 | } | |
855 | ||
856 | void | |
857 | nindy_kill (args, from_tty) | |
858 | char *args; | |
859 | int from_tty; | |
860 | { | |
861 | return; /* Ignore attempts to kill target system */ | |
862 | } | |
863 | ||
864 | /* Clean up when a program exits. | |
865 | ||
866 | The program actually lives on in the remote processor's RAM, and may be | |
867 | run again without a download. Don't leave it full of breakpoint | |
868 | instructions. */ | |
869 | ||
870 | void | |
871 | nindy_mourn_inferior () | |
872 | { | |
873 | remove_breakpoints (); | |
874 | generic_mourn_inferior (); /* Do all the proper things now */ | |
875 | } | |
876 | \f | |
877 | /* This routine is run as a hook, just before the main command loop is | |
878 | entered. If gdb is configured for the i960, but has not had its | |
879 | nindy target specified yet, this will loop prompting the user to do so. | |
880 | ||
881 | Unlike the loop provided by Intel, we actually let the user get out | |
882 | of this with a RETURN. This is useful when e.g. simply examining | |
883 | an i960 object file on the host system. */ | |
884 | ||
885 | nindy_before_main_loop () | |
886 | { | |
887 | char ttyname[100]; | |
888 | char *p, *p2; | |
889 | ||
890 | setjmp(to_top_level); | |
891 | while (current_target != &nindy_ops) { /* remote tty not specified yet */ | |
892 | if ( instream == stdin ){ | |
893 | printf("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: "); | |
894 | fflush( stdout ); | |
895 | } | |
896 | fgets( ttyname, sizeof(ttyname)-1, stdin ); | |
897 | ||
898 | /* Strip leading and trailing whitespace */ | |
899 | for ( p = ttyname; isspace(*p); p++ ){ | |
900 | ; | |
901 | } | |
902 | if ( *p == '\0' ){ | |
903 | return; /* User just hit spaces or return, wants out */ | |
904 | } | |
905 | for ( p2= p; !isspace(*p2) && (*p2 != '\0'); p2++ ){ | |
906 | ; | |
907 | } | |
908 | *p2= '\0'; | |
909 | if ( !strcmp("quit",p) ){ | |
910 | exit(1); | |
911 | } | |
912 | ||
913 | nindy_open( p, 1 ); | |
914 | ||
915 | /* Now that we have a tty open for talking to the remote machine, | |
916 | download the executable file if one was specified. */ | |
917 | if ( !setjmp(to_top_level) && exec_bfd ) { | |
918 | target_load (bfd_get_filename (exec_bfd), 1); | |
919 | } | |
920 | } | |
921 | } | |
922 | \f | |
923 | /* Define the target subroutine names */ | |
924 | ||
925 | struct target_ops nindy_ops = { | |
926 | "nindy", "Remote serial target in i960 NINDY-specific protocol", | |
f2fc6e7a JK |
927 | "Use a remote i960 system running NINDY connected by a serial line.\n\ |
928 | Specify the name of the device the serial line is connected to.\n\ | |
929 | The speed (baud rate), whether to use the old NINDY protocol,\n\ | |
930 | and whether to send a break on startup, are controlled by options\n\ | |
931 | specified when you started GDB.", | |
dd3b648e RP |
932 | nindy_open, nindy_close, |
933 | 0, nindy_detach, nindy_resume, nindy_wait, | |
934 | nindy_fetch_registers, nindy_store_registers, | |
a03d4f8e | 935 | nindy_prepare_to_store, |
dd3b648e RP |
936 | nindy_xfer_inferior_memory, nindy_files_info, |
937 | 0, 0, /* insert_breakpoint, remove_breakpoint, */ | |
938 | 0, 0, 0, 0, 0, /* Terminal crud */ | |
939 | nindy_kill, | |
8f1f2a72 | 940 | nindy_load, |
dd3b648e RP |
941 | 0, /* lookup_symbol */ |
942 | nindy_create_inferior, | |
943 | nindy_mourn_inferior, | |
944 | process_stratum, 0, /* next */ | |
945 | 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ | |
8f1f2a72 | 946 | 0, 0, /* Section pointers */ |
dd3b648e RP |
947 | OPS_MAGIC, /* Always the last thing */ |
948 | }; | |
949 | ||
950 | void | |
951 | _initialize_nindy () | |
952 | { | |
953 | add_target (&nindy_ops); | |
954 | add_com ("reset", class_obscure, reset_command, | |
955 | "Send a 'break' to the remote target system.\n\ | |
956 | Only useful if the target has been equipped with a circuit\n\ | |
957 | to perform a hard reset when a break is detected."); | |
958 | } |