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1 /* Remote debugging interface for MIPS remote debugging protocol.
2 Copyright 1993, 1994, 1995 Free Software Foundation, Inc.
3 Contributed by Cygnus Support. Written by Ian Lance Taylor
4 <ian@cygnus.com>.
5
6 This file is part of GDB.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
22
23 #include "defs.h"
24 #include "inferior.h"
25 #include "bfd.h"
26 #include "symfile.h"
27 #include "wait.h"
28 #include "gdbcmd.h"
29 #include "gdbcore.h"
30 #include "serial.h"
31 #include "target.h"
32 #include "remote-utils.h"
33 #include "gdb_string.h"
34
35 #include <signal.h>
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #ifdef ANSI_PROTOTYPES
39 #include <stdarg.h>
40 #else
41 #include <varargs.h>
42 #endif
43
44 /* Microsoft C's stat.h doesn't define all the POSIX file modes. */
45 #ifndef S_IROTH
46 #define S_IROTH S_IREAD
47 #endif
48
49 extern void mips_set_processor_type_command PARAMS ((char *, int));
50 \f
51
52 /* Breakpoint types. Values 0, 1, and 2 must agree with the watch
53 types passed by breakpoint.c to target_insert_watchpoint.
54 Value 3 is our own invention, and is used for ordinary instruction
55 breakpoints. Value 4 is used to mark an unused watchpoint in tables. */
56 enum break_type
57 {
58 BREAK_WRITE, /* 0 */
59 BREAK_READ, /* 1 */
60 BREAK_ACCESS, /* 2 */
61 BREAK_FETCH, /* 3 */
62 BREAK_UNUSED /* 4 */
63 };
64
65 /* Prototypes for local functions. */
66
67 static int mips_readchar PARAMS ((int timeout));
68
69 static int mips_receive_header PARAMS ((unsigned char *hdr, int *pgarbage,
70 int ch, int timeout));
71
72 static int mips_receive_trailer PARAMS ((unsigned char *trlr, int *pgarbage,
73 int *pch, int timeout));
74
75 static int mips_cksum PARAMS ((const unsigned char *hdr,
76 const unsigned char *data,
77 int len));
78
79 static void mips_send_packet PARAMS ((const char *s, int get_ack));
80
81 static void mips_send_command PARAMS ((const char *cmd, int prompt));
82
83 static int mips_receive_packet PARAMS ((char *buff, int throw_error,
84 int timeout));
85
86 static CORE_ADDR mips_request PARAMS ((int cmd, CORE_ADDR addr,
87 CORE_ADDR data, int *perr, int timeout,
88 char *buff));
89
90 static void mips_initialize PARAMS ((void));
91
92 static void mips_open PARAMS ((char *name, int from_tty));
93
94 static void pmon_open PARAMS ((char *name, int from_tty));
95
96 static void ddb_open PARAMS ((char *name, int from_tty));
97
98 static void lsi_open PARAMS ((char *name, int from_tty));
99
100 static void mips_close PARAMS ((int quitting));
101
102 static void mips_detach PARAMS ((char *args, int from_tty));
103
104 static void mips_resume PARAMS ((int pid, int step,
105 enum target_signal siggnal));
106
107 static int mips_wait PARAMS ((int pid, struct target_waitstatus * status));
108
109 static int mips_map_regno PARAMS ((int regno));
110
111 static void mips_fetch_registers PARAMS ((int regno));
112
113 static void mips_prepare_to_store PARAMS ((void));
114
115 static void mips_store_registers PARAMS ((int regno));
116
117 static unsigned int mips_fetch_word PARAMS ((CORE_ADDR addr));
118
119 static int mips_store_word PARAMS ((CORE_ADDR addr, unsigned int value,
120 char *old_contents));
121
122 static int mips_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len,
123 int write, struct target_ops * ignore));
124
125 static void mips_files_info PARAMS ((struct target_ops * ignore));
126
127 static void mips_create_inferior PARAMS ((char *execfile, char *args,
128 char **env));
129
130 static void mips_mourn_inferior PARAMS ((void));
131
132 static int pmon_makeb64 PARAMS ((unsigned long v, char *p, int n, int *chksum));
133
134 static int pmon_zeroset PARAMS ((int recsize, char **buff, int *amount,
135 unsigned int *chksum));
136
137 static int pmon_checkset PARAMS ((int recsize, char **buff, int *value));
138
139 static void pmon_make_fastrec PARAMS ((char **outbuf, unsigned char *inbuf,
140 int *inptr, int inamount, int *recsize,
141 unsigned int *csum, unsigned int *zerofill));
142
143 static int pmon_check_ack PARAMS ((char *mesg));
144
145 static void pmon_start_download PARAMS ((void));
146
147 static void pmon_end_download PARAMS ((int final, int bintotal));
148
149 static void pmon_download PARAMS ((char *buffer, int length));
150
151 static void pmon_load_fast PARAMS ((char *file));
152
153 static void mips_load PARAMS ((char *file, int from_tty));
154
155 static int mips_make_srec PARAMS ((char *buffer, int type, CORE_ADDR memaddr,
156 unsigned char *myaddr, int len));
157
158 static int set_breakpoint PARAMS ((CORE_ADDR addr, int len,
159 enum break_type type));
160
161 static int clear_breakpoint PARAMS ((CORE_ADDR addr, int len,
162 enum break_type type));
163
164 static int common_breakpoint PARAMS ((int set, CORE_ADDR addr, int len,
165 enum break_type type));
166
167 /* Forward declarations. */
168 extern struct target_ops mips_ops;
169 extern struct target_ops pmon_ops;
170 extern struct target_ops ddb_ops;
171 \f/* *INDENT-OFF* */
172 /* The MIPS remote debugging interface is built on top of a simple
173 packet protocol. Each packet is organized as follows:
174
175 SYN The first character is always a SYN (ASCII 026, or ^V). SYN
176 may not appear anywhere else in the packet. Any time a SYN is
177 seen, a new packet should be assumed to have begun.
178
179 TYPE_LEN
180 This byte contains the upper five bits of the logical length
181 of the data section, plus a single bit indicating whether this
182 is a data packet or an acknowledgement. The documentation
183 indicates that this bit is 1 for a data packet, but the actual
184 board uses 1 for an acknowledgement. The value of the byte is
185 0x40 + (ack ? 0x20 : 0) + (len >> 6)
186 (we always have 0 <= len < 1024). Acknowledgement packets do
187 not carry data, and must have a data length of 0.
188
189 LEN1 This byte contains the lower six bits of the logical length of
190 the data section. The value is
191 0x40 + (len & 0x3f)
192
193 SEQ This byte contains the six bit sequence number of the packet.
194 The value is
195 0x40 + seq
196 An acknowlegment packet contains the sequence number of the
197 packet being acknowledged plus 1 modulo 64. Data packets are
198 transmitted in sequence. There may only be one outstanding
199 unacknowledged data packet at a time. The sequence numbers
200 are independent in each direction. If an acknowledgement for
201 the previous packet is received (i.e., an acknowledgement with
202 the sequence number of the packet just sent) the packet just
203 sent should be retransmitted. If no acknowledgement is
204 received within a timeout period, the packet should be
205 retransmitted. This has an unfortunate failure condition on a
206 high-latency line, as a delayed acknowledgement may lead to an
207 endless series of duplicate packets.
208
209 DATA The actual data bytes follow. The following characters are
210 escaped inline with DLE (ASCII 020, or ^P):
211 SYN (026) DLE S
212 DLE (020) DLE D
213 ^C (003) DLE C
214 ^S (023) DLE s
215 ^Q (021) DLE q
216 The additional DLE characters are not counted in the logical
217 length stored in the TYPE_LEN and LEN1 bytes.
218
219 CSUM1
220 CSUM2
221 CSUM3
222 These bytes contain an 18 bit checksum of the complete
223 contents of the packet excluding the SEQ byte and the
224 CSUM[123] bytes. The checksum is simply the twos complement
225 addition of all the bytes treated as unsigned characters. The
226 values of the checksum bytes are:
227 CSUM1: 0x40 + ((cksum >> 12) & 0x3f)
228 CSUM2: 0x40 + ((cksum >> 6) & 0x3f)
229 CSUM3: 0x40 + (cksum & 0x3f)
230
231 It happens that the MIPS remote debugging protocol always
232 communicates with ASCII strings. Because of this, this
233 implementation doesn't bother to handle the DLE quoting mechanism,
234 since it will never be required. */
235 /* *INDENT-ON* */
236
237
238 /* The SYN character which starts each packet. */
239 #define SYN '\026'
240
241 /* The 0x40 used to offset each packet (this value ensures that all of
242 the header and trailer bytes, other than SYN, are printable ASCII
243 characters). */
244 #define HDR_OFFSET 0x40
245
246 /* The indices of the bytes in the packet header. */
247 #define HDR_INDX_SYN 0
248 #define HDR_INDX_TYPE_LEN 1
249 #define HDR_INDX_LEN1 2
250 #define HDR_INDX_SEQ 3
251 #define HDR_LENGTH 4
252
253 /* The data/ack bit in the TYPE_LEN header byte. */
254 #define TYPE_LEN_DA_BIT 0x20
255 #define TYPE_LEN_DATA 0
256 #define TYPE_LEN_ACK TYPE_LEN_DA_BIT
257
258 /* How to compute the header bytes. */
259 #define HDR_SET_SYN(data, len, seq) (SYN)
260 #define HDR_SET_TYPE_LEN(data, len, seq) \
261 (HDR_OFFSET \
262 + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \
263 + (((len) >> 6) & 0x1f))
264 #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f))
265 #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq))
266
267 /* Check that a header byte is reasonable. */
268 #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET)
269
270 /* Get data from the header. These macros evaluate their argument
271 multiple times. */
272 #define HDR_IS_DATA(hdr) \
273 (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA)
274 #define HDR_GET_LEN(hdr) \
275 ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f)))
276 #define HDR_GET_SEQ(hdr) ((unsigned int)(hdr)[HDR_INDX_SEQ] & 0x3f)
277
278 /* The maximum data length. */
279 #define DATA_MAXLEN 1023
280
281 /* The trailer offset. */
282 #define TRLR_OFFSET HDR_OFFSET
283
284 /* The indices of the bytes in the packet trailer. */
285 #define TRLR_INDX_CSUM1 0
286 #define TRLR_INDX_CSUM2 1
287 #define TRLR_INDX_CSUM3 2
288 #define TRLR_LENGTH 3
289
290 /* How to compute the trailer bytes. */
291 #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f))
292 #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f))
293 #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f))
294
295 /* Check that a trailer byte is reasonable. */
296 #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET)
297
298 /* Get data from the trailer. This evaluates its argument multiple
299 times. */
300 #define TRLR_GET_CKSUM(trlr) \
301 ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \
302 + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \
303 + ((trlr)[TRLR_INDX_CSUM3] & 0x3f))
304
305 /* The sequence number modulos. */
306 #define SEQ_MODULOS (64)
307
308 /* PMON commands to load from the serial port or UDP socket. */
309 #define LOAD_CMD "load -b -s tty0\r"
310 #define LOAD_CMD_UDP "load -b -s udp\r"
311
312 /* The target vectors for the four different remote MIPS targets.
313 These are initialized with code in _initialize_remote_mips instead
314 of static initializers, to make it easier to extend the target_ops
315 vector later. */
316 struct target_ops mips_ops, pmon_ops, ddb_ops, lsi_ops;
317
318 enum mips_monitor_type
319 {
320 /* IDT/SIM monitor being used: */
321 MON_IDT,
322 /* PMON monitor being used: */
323 MON_PMON, /* 3.0.83 [COGENT,EB,FP,NET] Algorithmics Ltd. Nov 9 1995 17:19:50 */
324 MON_DDB, /* 2.7.473 [DDBVR4300,EL,FP,NET] Risq Modular Systems, Thu Jun 6 09:28:40 PDT 1996 */
325 MON_LSI, /* 4.3.12 [EB,FP], LSI LOGIC Corp. Tue Feb 25 13:22:14 1997 */
326 /* Last and unused value, for sizing vectors, etc. */
327 MON_LAST
328 };
329 static enum mips_monitor_type mips_monitor = MON_LAST;
330
331 /* The monitor prompt text. If the user sets the PMON prompt
332 to some new value, the GDB `set monitor-prompt' command must also
333 be used to inform GDB about the expected prompt. Otherwise, GDB
334 will not be able to connect to PMON in mips_initialize().
335 If the `set monitor-prompt' command is not used, the expected
336 default prompt will be set according the target:
337 target prompt
338 ----- -----
339 pmon PMON>
340 ddb NEC010>
341 lsi PMON>
342 */
343 static char *mips_monitor_prompt;
344
345 /* Set to 1 if the target is open. */
346 static int mips_is_open;
347
348 /* Currently active target description (if mips_is_open == 1) */
349 static struct target_ops *current_ops;
350
351 /* Set to 1 while the connection is being initialized. */
352 static int mips_initializing;
353
354 /* Set to 1 while the connection is being brought down. */
355 static int mips_exiting;
356
357 /* The next sequence number to send. */
358 static unsigned int mips_send_seq;
359
360 /* The next sequence number we expect to receive. */
361 static unsigned int mips_receive_seq;
362
363 /* The time to wait before retransmitting a packet, in seconds. */
364 static int mips_retransmit_wait = 3;
365
366 /* The number of times to try retransmitting a packet before giving up. */
367 static int mips_send_retries = 10;
368
369 /* The number of garbage characters to accept when looking for an
370 SYN for the next packet. */
371 static int mips_syn_garbage = 1050;
372
373 /* The time to wait for a packet, in seconds. */
374 static int mips_receive_wait = 5;
375
376 /* Set if we have sent a packet to the board but have not yet received
377 a reply. */
378 static int mips_need_reply = 0;
379
380 /* Handle used to access serial I/O stream. */
381 static serial_t mips_desc;
382
383 /* UDP handle used to download files to target. */
384 static serial_t udp_desc;
385 static int udp_in_use;
386
387 /* TFTP filename used to download files to DDB board, in the form
388 host:filename. */
389 static char *tftp_name; /* host:filename */
390 static char *tftp_localname; /* filename portion of above */
391 static int tftp_in_use;
392 static FILE *tftp_file;
393
394 /* Counts the number of times the user tried to interrupt the target (usually
395 via ^C. */
396 static int interrupt_count;
397
398 /* If non-zero, means that the target is running. */
399 static int mips_wait_flag = 0;
400
401 /* If non-zero, monitor supports breakpoint commands. */
402 static monitor_supports_breakpoints = 0;
403
404 /* Data cache header. */
405
406 #if 0 /* not used (yet?) */
407 static DCACHE *mips_dcache;
408 #endif
409
410 /* Non-zero means that we've just hit a read or write watchpoint */
411 static int hit_watchpoint;
412
413 /* Table of breakpoints/watchpoints (used only on LSI PMON target).
414 The table is indexed by a breakpoint number, which is an integer
415 from 0 to 255 returned by the LSI PMON when a breakpoint is set.
416 */
417 #define MAX_LSI_BREAKPOINTS 256
418 struct lsi_breakpoint_info
419 {
420 enum break_type type; /* type of breakpoint */
421 CORE_ADDR addr; /* address of breakpoint */
422 int len; /* length of region being watched */
423 unsigned long value; /* value to watch */
424 }
425 lsi_breakpoints[MAX_LSI_BREAKPOINTS];
426
427 /* Error/warning codes returned by LSI PMON for breakpoint commands.
428 Warning values may be ORed together; error values may not. */
429 #define W_WARN 0x100 /* This bit is set if the error code is a warning */
430 #define W_MSK 0x101 /* warning: Range feature is supported via mask */
431 #define W_VAL 0x102 /* warning: Value check is not supported in hardware */
432 #define W_QAL 0x104 /* warning: Requested qualifiers are not supported in hardware */
433
434 #define E_ERR 0x200 /* This bit is set if the error code is an error */
435 #define E_BPT 0x200 /* error: No such breakpoint number */
436 #define E_RGE 0x201 /* error: Range is not supported */
437 #define E_QAL 0x202 /* error: The requested qualifiers can not be used */
438 #define E_OUT 0x203 /* error: Out of hardware resources */
439 #define E_NON 0x204 /* error: Hardware breakpoint not supported */
440
441 struct lsi_error
442 {
443 int code; /* error code */
444 char *string; /* string associated with this code */
445 };
446
447 struct lsi_error lsi_warning_table[] =
448 {
449 {W_MSK, "Range feature is supported via mask"},
450 {W_VAL, "Value check is not supported in hardware"},
451 {W_QAL, "Requested qualifiers are not supported in hardware"},
452 {0, NULL}
453 };
454
455 struct lsi_error lsi_error_table[] =
456 {
457 {E_BPT, "No such breakpoint number"},
458 {E_RGE, "Range is not supported"},
459 {E_QAL, "The requested qualifiers can not be used"},
460 {E_OUT, "Out of hardware resources"},
461 {E_NON, "Hardware breakpoint not supported"},
462 {0, NULL}
463 };
464
465 /* Set to 1 with the 'set monitor-warnings' command to enable printing
466 of warnings returned by PMON when hardware breakpoints are used. */
467 static int monitor_warnings;
468
469
470 static void
471 close_ports ()
472 {
473 mips_is_open = 0;
474 SERIAL_CLOSE (mips_desc);
475
476 if (udp_in_use)
477 {
478 SERIAL_CLOSE (udp_desc);
479 udp_in_use = 0;
480 }
481 tftp_in_use = 0;
482 }
483
484 /* Handle low-level error that we can't recover from. Note that just
485 error()ing out from target_wait or some such low-level place will cause
486 all hell to break loose--the rest of GDB will tend to get left in an
487 inconsistent state. */
488
489 static NORETURN void
490 #ifdef ANSI_PROTOTYPES
491 mips_error (char *string,...)
492 #else
493 mips_error (va_alist)
494 va_dcl
495 #endif
496 {
497 va_list args;
498
499 #ifdef ANSI_PROTOTYPES
500 va_start (args, string);
501 #else
502 char *string;
503 va_start (args);
504 string = va_arg (args, char *);
505 #endif
506
507 target_terminal_ours ();
508 wrap_here (""); /* Force out any buffered output */
509 gdb_flush (gdb_stdout);
510 if (error_pre_print)
511 fprintf_filtered (gdb_stderr, error_pre_print);
512 vfprintf_filtered (gdb_stderr, string, args);
513 fprintf_filtered (gdb_stderr, "\n");
514 va_end (args);
515 gdb_flush (gdb_stderr);
516
517 /* Clean up in such a way that mips_close won't try to talk to the
518 board (it almost surely won't work since we weren't able to talk to
519 it). */
520 close_ports ();
521
522 printf_unfiltered ("Ending remote MIPS debugging.\n");
523 target_mourn_inferior ();
524
525 return_to_top_level (RETURN_ERROR);
526 }
527
528 /* putc_readable - print a character, displaying non-printable chars in
529 ^x notation or in hex. */
530
531 static void
532 fputc_readable (ch, file)
533 int ch;
534 struct gdb_file *file;
535 {
536 if (ch == '\n')
537 fputc_unfiltered ('\n', file);
538 else if (ch == '\r')
539 fprintf_unfiltered (file, "\\r");
540 else if (ch < 0x20) /* ASCII control character */
541 fprintf_unfiltered (file, "^%c", ch + '@');
542 else if (ch >= 0x7f) /* non-ASCII characters (rubout or greater) */
543 fprintf_unfiltered (file, "[%02x]", ch & 0xff);
544 else
545 fputc_unfiltered (ch, file);
546 }
547
548
549 /* puts_readable - print a string, displaying non-printable chars in
550 ^x notation or in hex. */
551
552 static void
553 fputs_readable (string, file)
554 char *string;
555 struct gdb_file *file;
556 {
557 int c;
558
559 while ((c = *string++) != '\0')
560 fputc_readable (c, file);
561 }
562
563
564 /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if
565 timed out. TIMEOUT specifies timeout value in seconds.
566 */
567
568 int
569 mips_expect_timeout (string, timeout)
570 char *string;
571 int timeout;
572 {
573 char *p = string;
574
575 if (remote_debug)
576 {
577 fprintf_unfiltered (gdb_stdlog, "Expected \"");
578 fputs_readable (string, gdb_stdlog);
579 fprintf_unfiltered (gdb_stdlog, "\", got \"");
580 }
581
582 immediate_quit = 1;
583 while (1)
584 {
585 int c;
586
587 /* Must use SERIAL_READCHAR here cuz mips_readchar would get confused if we
588 were waiting for the mips_monitor_prompt... */
589
590 c = SERIAL_READCHAR (mips_desc, timeout);
591
592 if (c == SERIAL_TIMEOUT)
593 {
594 if (remote_debug)
595 fprintf_unfiltered (gdb_stdlog, "\": FAIL\n");
596 return 0;
597 }
598
599 if (remote_debug)
600 fputc_readable (c, gdb_stdlog);
601
602 if (c == *p++)
603 {
604 if (*p == '\0')
605 {
606 immediate_quit = 0;
607 if (remote_debug)
608 fprintf_unfiltered (gdb_stdlog, "\": OK\n");
609 return 1;
610 }
611 }
612 else
613 {
614 p = string;
615 if (c == *p)
616 p++;
617 }
618 }
619 }
620
621 /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if
622 timed out. The timeout value is hard-coded to 2 seconds. Use
623 mips_expect_timeout if a different timeout value is needed.
624 */
625
626 int
627 mips_expect (string)
628 char *string;
629 {
630 return mips_expect_timeout (string, 2);
631 }
632
633 /* Read the required number of characters into the given buffer (which
634 is assumed to be large enough). The only failure is a timeout. */
635 int
636 mips_getstring (string, n)
637 char *string;
638 int n;
639 {
640 char *p = string;
641 int c;
642
643 immediate_quit = 1;
644 while (n > 0)
645 {
646 c = SERIAL_READCHAR (mips_desc, 2);
647
648 if (c == SERIAL_TIMEOUT)
649 {
650 fprintf_unfiltered (gdb_stderr,
651 "Failed to read %d characters from target (TIMEOUT)\n", n);
652 return 0;
653 }
654
655 *p++ = c;
656 n--;
657 }
658
659 return 1;
660 }
661
662 /* Read a character from the remote, aborting on error. Returns
663 SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR
664 returns). FIXME: If we see the string mips_monitor_prompt from
665 the board, then we are debugging on the main console port, and we
666 have somehow dropped out of remote debugging mode. In this case,
667 we automatically go back in to remote debugging mode. This is a
668 hack, put in because I can't find any way for a program running on
669 the remote board to terminate without also ending remote debugging
670 mode. I assume users won't have any trouble with this; for one
671 thing, the IDT documentation generally assumes that the remote
672 debugging port is not the console port. This is, however, very
673 convenient for DejaGnu when you only have one connected serial
674 port. */
675
676 static int
677 mips_readchar (timeout)
678 int timeout;
679 {
680 int ch;
681 static int state = 0;
682 int mips_monitor_prompt_len = strlen (mips_monitor_prompt);
683
684 {
685 int i;
686
687 i = timeout;
688 if (i == -1 && watchdog > 0)
689 i = watchdog;
690 }
691
692 if (state == mips_monitor_prompt_len)
693 timeout = 1;
694 ch = SERIAL_READCHAR (mips_desc, timeout);
695
696 if (ch == SERIAL_TIMEOUT && timeout == -1) /* Watchdog went off */
697 {
698 target_mourn_inferior ();
699 error ("Watchdog has expired. Target detached.\n");
700 }
701
702 if (ch == SERIAL_EOF)
703 mips_error ("End of file from remote");
704 if (ch == SERIAL_ERROR)
705 mips_error ("Error reading from remote: %s", safe_strerror (errno));
706 if (remote_debug > 1)
707 {
708 /* Don't use _filtered; we can't deal with a QUIT out of
709 target_wait, and I think this might be called from there. */
710 if (ch != SERIAL_TIMEOUT)
711 fprintf_unfiltered (gdb_stdlog, "Read '%c' %d 0x%x\n", ch, ch, ch);
712 else
713 fprintf_unfiltered (gdb_stdlog, "Timed out in read\n");
714 }
715
716 /* If we have seen mips_monitor_prompt and we either time out, or
717 we see a @ (which was echoed from a packet we sent), reset the
718 board as described above. The first character in a packet after
719 the SYN (which is not echoed) is always an @ unless the packet is
720 more than 64 characters long, which ours never are. */
721 if ((ch == SERIAL_TIMEOUT || ch == '@')
722 && state == mips_monitor_prompt_len
723 && !mips_initializing
724 && !mips_exiting)
725 {
726 if (remote_debug > 0)
727 /* Don't use _filtered; we can't deal with a QUIT out of
728 target_wait, and I think this might be called from there. */
729 fprintf_unfiltered (gdb_stdlog, "Reinitializing MIPS debugging mode\n");
730
731 mips_need_reply = 0;
732 mips_initialize ();
733
734 state = 0;
735
736 /* At this point, about the only thing we can do is abort the command
737 in progress and get back to command level as quickly as possible. */
738
739 error ("Remote board reset, debug protocol re-initialized.");
740 }
741
742 if (ch == mips_monitor_prompt[state])
743 ++state;
744 else
745 state = 0;
746
747 return ch;
748 }
749
750 /* Get a packet header, putting the data in the supplied buffer.
751 PGARBAGE is a pointer to the number of garbage characters received
752 so far. CH is the last character received. Returns 0 for success,
753 or -1 for timeout. */
754
755 static int
756 mips_receive_header (hdr, pgarbage, ch, timeout)
757 unsigned char *hdr;
758 int *pgarbage;
759 int ch;
760 int timeout;
761 {
762 int i;
763
764 while (1)
765 {
766 /* Wait for a SYN. mips_syn_garbage is intended to prevent
767 sitting here indefinitely if the board sends us one garbage
768 character per second. ch may already have a value from the
769 last time through the loop. */
770 while (ch != SYN)
771 {
772 ch = mips_readchar (timeout);
773 if (ch == SERIAL_TIMEOUT)
774 return -1;
775 if (ch != SYN)
776 {
777 /* Printing the character here lets the user of gdb see
778 what the program is outputting, if the debugging is
779 being done on the console port. Don't use _filtered;
780 we can't deal with a QUIT out of target_wait. */
781 if (!mips_initializing || remote_debug > 0)
782 {
783 fputc_readable (ch, gdb_stdlog);
784 gdb_flush (gdb_stdlog);
785 }
786
787 ++*pgarbage;
788 if (mips_syn_garbage > 0
789 && *pgarbage > mips_syn_garbage)
790 mips_error ("Debug protocol failure: more than %d characters before a sync.",
791 mips_syn_garbage);
792 }
793 }
794
795 /* Get the packet header following the SYN. */
796 for (i = 1; i < HDR_LENGTH; i++)
797 {
798 ch = mips_readchar (timeout);
799 if (ch == SERIAL_TIMEOUT)
800 return -1;
801 /* Make sure this is a header byte. */
802 if (ch == SYN || !HDR_CHECK (ch))
803 break;
804
805 hdr[i] = ch;
806 }
807
808 /* If we got the complete header, we can return. Otherwise we
809 loop around and keep looking for SYN. */
810 if (i >= HDR_LENGTH)
811 return 0;
812 }
813 }
814
815 /* Get a packet header, putting the data in the supplied buffer.
816 PGARBAGE is a pointer to the number of garbage characters received
817 so far. The last character read is returned in *PCH. Returns 0
818 for success, -1 for timeout, -2 for error. */
819
820 static int
821 mips_receive_trailer (trlr, pgarbage, pch, timeout)
822 unsigned char *trlr;
823 int *pgarbage;
824 int *pch;
825 int timeout;
826 {
827 int i;
828 int ch;
829
830 for (i = 0; i < TRLR_LENGTH; i++)
831 {
832 ch = mips_readchar (timeout);
833 *pch = ch;
834 if (ch == SERIAL_TIMEOUT)
835 return -1;
836 if (!TRLR_CHECK (ch))
837 return -2;
838 trlr[i] = ch;
839 }
840 return 0;
841 }
842
843 /* Get the checksum of a packet. HDR points to the packet header.
844 DATA points to the packet data. LEN is the length of DATA. */
845
846 static int
847 mips_cksum (hdr, data, len)
848 const unsigned char *hdr;
849 const unsigned char *data;
850 int len;
851 {
852 register const unsigned char *p;
853 register int c;
854 register int cksum;
855
856 cksum = 0;
857
858 /* The initial SYN is not included in the checksum. */
859 c = HDR_LENGTH - 1;
860 p = hdr + 1;
861 while (c-- != 0)
862 cksum += *p++;
863
864 c = len;
865 p = data;
866 while (c-- != 0)
867 cksum += *p++;
868
869 return cksum;
870 }
871
872 /* Send a packet containing the given ASCII string. */
873
874 static void
875 mips_send_packet (s, get_ack)
876 const char *s;
877 int get_ack;
878 {
879 /* unsigned */ int len;
880 unsigned char *packet;
881 register int cksum;
882 int try;
883
884 len = strlen (s);
885 if (len > DATA_MAXLEN)
886 mips_error ("MIPS protocol data packet too long: %s", s);
887
888 packet = (unsigned char *) alloca (HDR_LENGTH + len + TRLR_LENGTH + 1);
889
890 packet[HDR_INDX_SYN] = HDR_SET_SYN (1, len, mips_send_seq);
891 packet[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (1, len, mips_send_seq);
892 packet[HDR_INDX_LEN1] = HDR_SET_LEN1 (1, len, mips_send_seq);
893 packet[HDR_INDX_SEQ] = HDR_SET_SEQ (1, len, mips_send_seq);
894
895 memcpy (packet + HDR_LENGTH, s, len);
896
897 cksum = mips_cksum (packet, packet + HDR_LENGTH, len);
898 packet[HDR_LENGTH + len + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum);
899 packet[HDR_LENGTH + len + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
900 packet[HDR_LENGTH + len + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
901
902 /* Increment the sequence number. This will set mips_send_seq to
903 the sequence number we expect in the acknowledgement. */
904 mips_send_seq = (mips_send_seq + 1) % SEQ_MODULOS;
905
906 /* We can only have one outstanding data packet, so we just wait for
907 the acknowledgement here. Keep retransmitting the packet until
908 we get one, or until we've tried too many times. */
909 for (try = 0; try < mips_send_retries; try++)
910 {
911 int garbage;
912 int ch;
913
914 if (remote_debug > 0)
915 {
916 /* Don't use _filtered; we can't deal with a QUIT out of
917 target_wait, and I think this might be called from there. */
918 packet[HDR_LENGTH + len + TRLR_LENGTH] = '\0';
919 fprintf_unfiltered (gdb_stdlog, "Writing \"%s\"\n", packet + 1);
920 }
921
922 if (SERIAL_WRITE (mips_desc, packet,
923 HDR_LENGTH + len + TRLR_LENGTH) != 0)
924 mips_error ("write to target failed: %s", safe_strerror (errno));
925
926 if (!get_ack)
927 return;
928
929 garbage = 0;
930 ch = 0;
931 while (1)
932 {
933 unsigned char hdr[HDR_LENGTH + 1];
934 unsigned char trlr[TRLR_LENGTH + 1];
935 int err;
936 unsigned int seq;
937
938 /* Get the packet header. If we time out, resend the data
939 packet. */
940 err = mips_receive_header (hdr, &garbage, ch, mips_retransmit_wait);
941 if (err != 0)
942 break;
943
944 ch = 0;
945
946 /* If we get a data packet, assume it is a duplicate and
947 ignore it. FIXME: If the acknowledgement is lost, this
948 data packet may be the packet the remote sends after the
949 acknowledgement. */
950 if (HDR_IS_DATA (hdr))
951 {
952 int i;
953
954 /* Ignore any errors raised whilst attempting to ignore
955 packet. */
956
957 len = HDR_GET_LEN (hdr);
958
959 for (i = 0; i < len; i++)
960 {
961 int rch;
962
963 rch = mips_readchar (2);
964 if (rch == SYN)
965 {
966 ch = SYN;
967 break;
968 }
969 if (rch == SERIAL_TIMEOUT)
970 break;
971 /* ignore the character */
972 }
973
974 if (i == len)
975 (void) mips_receive_trailer (trlr, &garbage, &ch, 2);
976
977 /* We don't bother checking the checksum, or providing an
978 ACK to the packet. */
979 continue;
980 }
981
982 /* If the length is not 0, this is a garbled packet. */
983 if (HDR_GET_LEN (hdr) != 0)
984 continue;
985
986 /* Get the packet trailer. */
987 err = mips_receive_trailer (trlr, &garbage, &ch,
988 mips_retransmit_wait);
989
990 /* If we timed out, resend the data packet. */
991 if (err == -1)
992 break;
993
994 /* If we got a bad character, reread the header. */
995 if (err != 0)
996 continue;
997
998 /* If the checksum does not match the trailer checksum, this
999 is a bad packet; ignore it. */
1000 if (mips_cksum (hdr, (unsigned char *) NULL, 0)
1001 != TRLR_GET_CKSUM (trlr))
1002 continue;
1003
1004 if (remote_debug > 0)
1005 {
1006 hdr[HDR_LENGTH] = '\0';
1007 trlr[TRLR_LENGTH] = '\0';
1008 /* Don't use _filtered; we can't deal with a QUIT out of
1009 target_wait, and I think this might be called from there. */
1010 fprintf_unfiltered (gdb_stdlog, "Got ack %d \"%s%s\"\n",
1011 HDR_GET_SEQ (hdr), hdr + 1, trlr);
1012 }
1013
1014 /* If this ack is for the current packet, we're done. */
1015 seq = HDR_GET_SEQ (hdr);
1016 if (seq == mips_send_seq)
1017 return;
1018
1019 /* If this ack is for the last packet, resend the current
1020 packet. */
1021 if ((seq + 1) % SEQ_MODULOS == mips_send_seq)
1022 break;
1023
1024 /* Otherwise this is a bad ack; ignore it. Increment the
1025 garbage count to ensure that we do not stay in this loop
1026 forever. */
1027 ++garbage;
1028 }
1029 }
1030
1031 mips_error ("Remote did not acknowledge packet");
1032 }
1033
1034 /* Receive and acknowledge a packet, returning the data in BUFF (which
1035 should be DATA_MAXLEN + 1 bytes). The protocol documentation
1036 implies that only the sender retransmits packets, so this code just
1037 waits silently for a packet. It returns the length of the received
1038 packet. If THROW_ERROR is nonzero, call error() on errors. If not,
1039 don't print an error message and return -1. */
1040
1041 static int
1042 mips_receive_packet (buff, throw_error, timeout)
1043 char *buff;
1044 int throw_error;
1045 int timeout;
1046 {
1047 int ch;
1048 int garbage;
1049 int len;
1050 unsigned char ack[HDR_LENGTH + TRLR_LENGTH + 1];
1051 int cksum;
1052
1053 ch = 0;
1054 garbage = 0;
1055 while (1)
1056 {
1057 unsigned char hdr[HDR_LENGTH];
1058 unsigned char trlr[TRLR_LENGTH];
1059 int i;
1060 int err;
1061
1062 if (mips_receive_header (hdr, &garbage, ch, timeout) != 0)
1063 {
1064 if (throw_error)
1065 mips_error ("Timed out waiting for remote packet");
1066 else
1067 return -1;
1068 }
1069
1070 ch = 0;
1071
1072 /* An acknowledgement is probably a duplicate; ignore it. */
1073 if (!HDR_IS_DATA (hdr))
1074 {
1075 len = HDR_GET_LEN (hdr);
1076 /* Check if the length is valid for an ACK, we may aswell
1077 try and read the remainder of the packet: */
1078 if (len == 0)
1079 {
1080 /* Ignore the error condition, since we are going to
1081 ignore the packet anyway. */
1082 (void) mips_receive_trailer (trlr, &garbage, &ch, timeout);
1083 }
1084 /* Don't use _filtered; we can't deal with a QUIT out of
1085 target_wait, and I think this might be called from there. */
1086 if (remote_debug > 0)
1087 fprintf_unfiltered (gdb_stdlog, "Ignoring unexpected ACK\n");
1088 continue;
1089 }
1090
1091 len = HDR_GET_LEN (hdr);
1092 for (i = 0; i < len; i++)
1093 {
1094 int rch;
1095
1096 rch = mips_readchar (timeout);
1097 if (rch == SYN)
1098 {
1099 ch = SYN;
1100 break;
1101 }
1102 if (rch == SERIAL_TIMEOUT)
1103 {
1104 if (throw_error)
1105 mips_error ("Timed out waiting for remote packet");
1106 else
1107 return -1;
1108 }
1109 buff[i] = rch;
1110 }
1111
1112 if (i < len)
1113 {
1114 /* Don't use _filtered; we can't deal with a QUIT out of
1115 target_wait, and I think this might be called from there. */
1116 if (remote_debug > 0)
1117 fprintf_unfiltered (gdb_stdlog,
1118 "Got new SYN after %d chars (wanted %d)\n",
1119 i, len);
1120 continue;
1121 }
1122
1123 err = mips_receive_trailer (trlr, &garbage, &ch, timeout);
1124 if (err == -1)
1125 {
1126 if (throw_error)
1127 mips_error ("Timed out waiting for packet");
1128 else
1129 return -1;
1130 }
1131 if (err == -2)
1132 {
1133 /* Don't use _filtered; we can't deal with a QUIT out of
1134 target_wait, and I think this might be called from there. */
1135 if (remote_debug > 0)
1136 fprintf_unfiltered (gdb_stdlog, "Got SYN when wanted trailer\n");
1137 continue;
1138 }
1139
1140 /* If this is the wrong sequence number, ignore it. */
1141 if (HDR_GET_SEQ (hdr) != mips_receive_seq)
1142 {
1143 /* Don't use _filtered; we can't deal with a QUIT out of
1144 target_wait, and I think this might be called from there. */
1145 if (remote_debug > 0)
1146 fprintf_unfiltered (gdb_stdlog,
1147 "Ignoring sequence number %d (want %d)\n",
1148 HDR_GET_SEQ (hdr), mips_receive_seq);
1149 continue;
1150 }
1151
1152 if (mips_cksum (hdr, buff, len) == TRLR_GET_CKSUM (trlr))
1153 break;
1154
1155 if (remote_debug > 0)
1156 /* Don't use _filtered; we can't deal with a QUIT out of
1157 target_wait, and I think this might be called from there. */
1158 printf_unfiltered ("Bad checksum; data %d, trailer %d\n",
1159 mips_cksum (hdr, buff, len),
1160 TRLR_GET_CKSUM (trlr));
1161
1162 /* The checksum failed. Send an acknowledgement for the
1163 previous packet to tell the remote to resend the packet. */
1164 ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq);
1165 ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq);
1166 ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq);
1167 ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq);
1168
1169 cksum = mips_cksum (ack, (unsigned char *) NULL, 0);
1170
1171 ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum);
1172 ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
1173 ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
1174
1175 if (remote_debug > 0)
1176 {
1177 ack[HDR_LENGTH + TRLR_LENGTH] = '\0';
1178 /* Don't use _filtered; we can't deal with a QUIT out of
1179 target_wait, and I think this might be called from there. */
1180 printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq,
1181 ack + 1);
1182 }
1183
1184 if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0)
1185 {
1186 if (throw_error)
1187 mips_error ("write to target failed: %s", safe_strerror (errno));
1188 else
1189 return -1;
1190 }
1191 }
1192
1193 if (remote_debug > 0)
1194 {
1195 buff[len] = '\0';
1196 /* Don't use _filtered; we can't deal with a QUIT out of
1197 target_wait, and I think this might be called from there. */
1198 printf_unfiltered ("Got packet \"%s\"\n", buff);
1199 }
1200
1201 /* We got the packet. Send an acknowledgement. */
1202 mips_receive_seq = (mips_receive_seq + 1) % SEQ_MODULOS;
1203
1204 ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq);
1205 ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq);
1206 ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq);
1207 ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq);
1208
1209 cksum = mips_cksum (ack, (unsigned char *) NULL, 0);
1210
1211 ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum);
1212 ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum);
1213 ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum);
1214
1215 if (remote_debug > 0)
1216 {
1217 ack[HDR_LENGTH + TRLR_LENGTH] = '\0';
1218 /* Don't use _filtered; we can't deal with a QUIT out of
1219 target_wait, and I think this might be called from there. */
1220 printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq,
1221 ack + 1);
1222 }
1223
1224 if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0)
1225 {
1226 if (throw_error)
1227 mips_error ("write to target failed: %s", safe_strerror (errno));
1228 else
1229 return -1;
1230 }
1231
1232 return len;
1233 }
1234 \f
1235 /* Optionally send a request to the remote system and optionally wait
1236 for the reply. This implements the remote debugging protocol,
1237 which is built on top of the packet protocol defined above. Each
1238 request has an ADDR argument and a DATA argument. The following
1239 requests are defined:
1240
1241 \0 don't send a request; just wait for a reply
1242 i read word from instruction space at ADDR
1243 d read word from data space at ADDR
1244 I write DATA to instruction space at ADDR
1245 D write DATA to data space at ADDR
1246 r read register number ADDR
1247 R set register number ADDR to value DATA
1248 c continue execution (if ADDR != 1, set pc to ADDR)
1249 s single step (if ADDR != 1, set pc to ADDR)
1250
1251 The read requests return the value requested. The write requests
1252 return the previous value in the changed location. The execution
1253 requests return a UNIX wait value (the approximate signal which
1254 caused execution to stop is in the upper eight bits).
1255
1256 If PERR is not NULL, this function waits for a reply. If an error
1257 occurs, it sets *PERR to 1 and sets errno according to what the
1258 target board reports. */
1259
1260 static CORE_ADDR
1261 mips_request (cmd, addr, data, perr, timeout, buff)
1262 int cmd;
1263 CORE_ADDR addr;
1264 CORE_ADDR data;
1265 int *perr;
1266 int timeout;
1267 char *buff;
1268 {
1269 char myBuff[DATA_MAXLEN + 1];
1270 int len;
1271 int rpid;
1272 char rcmd;
1273 int rerrflg;
1274 unsigned long rresponse;
1275
1276 if (buff == (char *) NULL)
1277 buff = myBuff;
1278
1279 if (cmd != '\0')
1280 {
1281 if (mips_need_reply)
1282 fatal ("mips_request: Trying to send command before reply");
1283 sprintf (buff, "0x0 %c 0x%s 0x%s", cmd, paddr_nz (addr), paddr_nz (data));
1284 mips_send_packet (buff, 1);
1285 mips_need_reply = 1;
1286 }
1287
1288 if (perr == (int *) NULL)
1289 return 0;
1290
1291 if (!mips_need_reply)
1292 fatal ("mips_request: Trying to get reply before command");
1293
1294 mips_need_reply = 0;
1295
1296 len = mips_receive_packet (buff, 1, timeout);
1297 buff[len] = '\0';
1298
1299 if (sscanf (buff, "0x%x %c 0x%x 0x%lx",
1300 &rpid, &rcmd, &rerrflg, &rresponse) != 4
1301 || (cmd != '\0' && rcmd != cmd))
1302 mips_error ("Bad response from remote board");
1303
1304 if (rerrflg != 0)
1305 {
1306 *perr = 1;
1307
1308 /* FIXME: This will returns MIPS errno numbers, which may or may
1309 not be the same as errno values used on other systems. If
1310 they stick to common errno values, they will be the same, but
1311 if they don't, they must be translated. */
1312 errno = rresponse;
1313
1314 return 0;
1315 }
1316
1317 *perr = 0;
1318 return rresponse;
1319 }
1320
1321 static void
1322 mips_initialize_cleanups (arg)
1323 PTR arg;
1324 {
1325 mips_initializing = 0;
1326 }
1327
1328 static void
1329 mips_exit_cleanups (arg)
1330 PTR arg;
1331 {
1332 mips_exiting = 0;
1333 }
1334
1335 static void
1336 mips_send_command (cmd, prompt)
1337 const char *cmd;
1338 int prompt;
1339 {
1340 SERIAL_WRITE (mips_desc, cmd, strlen (cmd));
1341 mips_expect (cmd);
1342 mips_expect ("\n");
1343 if (prompt)
1344 mips_expect (mips_monitor_prompt);
1345 }
1346
1347 /* Enter remote (dbx) debug mode: */
1348 static void
1349 mips_enter_debug ()
1350 {
1351 /* Reset the sequence numbers, ready for the new debug sequence: */
1352 mips_send_seq = 0;
1353 mips_receive_seq = 0;
1354
1355 if (mips_monitor != MON_IDT)
1356 mips_send_command ("debug\r", 0);
1357 else /* assume IDT monitor by default */
1358 mips_send_command ("db tty0\r", 0);
1359
1360 sleep (1);
1361 SERIAL_WRITE (mips_desc, "\r", sizeof "\r" - 1);
1362
1363 /* We don't need to absorb any spurious characters here, since the
1364 mips_receive_header will eat up a reasonable number of characters
1365 whilst looking for the SYN, however this avoids the "garbage"
1366 being displayed to the user. */
1367 if (mips_monitor != MON_IDT)
1368 mips_expect ("\r");
1369
1370 {
1371 char buff[DATA_MAXLEN + 1];
1372 if (mips_receive_packet (buff, 1, 3) < 0)
1373 mips_error ("Failed to initialize (didn't receive packet).");
1374 }
1375 }
1376
1377 /* Exit remote (dbx) debug mode, returning to the monitor prompt: */
1378 static int
1379 mips_exit_debug ()
1380 {
1381 int err;
1382 struct cleanup *old_cleanups = make_cleanup (mips_exit_cleanups, NULL);
1383
1384 mips_exiting = 1;
1385
1386 if (mips_monitor != MON_IDT)
1387 {
1388 /* The DDB (NEC) and MiniRISC (LSI) versions of PMON exit immediately,
1389 so we do not get a reply to this command: */
1390 mips_request ('x', (unsigned int) 0, (unsigned int) 0, NULL,
1391 mips_receive_wait, NULL);
1392 mips_need_reply = 0;
1393 if (!mips_expect (" break!"))
1394 return -1;
1395 }
1396 else
1397 mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err,
1398 mips_receive_wait, NULL);
1399
1400 if (!mips_expect (mips_monitor_prompt))
1401 return -1;
1402
1403 do_cleanups (old_cleanups);
1404
1405 return 0;
1406 }
1407
1408 /* Initialize a new connection to the MIPS board, and make sure we are
1409 really connected. */
1410
1411 static void
1412 mips_initialize ()
1413 {
1414 int err;
1415 struct cleanup *old_cleanups = make_cleanup (mips_initialize_cleanups, NULL);
1416 int j;
1417
1418 /* What is this code doing here? I don't see any way it can happen, and
1419 it might mean mips_initializing didn't get cleared properly.
1420 So I'll make it a warning. */
1421
1422 if (mips_initializing)
1423 {
1424 warning ("internal error: mips_initialize called twice");
1425 return;
1426 }
1427
1428 mips_wait_flag = 0;
1429 mips_initializing = 1;
1430
1431 /* At this point, the packit protocol isn't responding. We'll try getting
1432 into the monitor, and restarting the protocol. */
1433
1434 /* Force the system into the monitor. After this we *should* be at
1435 the mips_monitor_prompt. */
1436 if (mips_monitor != MON_IDT)
1437 j = 0; /* start by checking if we are already at the prompt */
1438 else
1439 j = 1; /* start by sending a break */
1440 for (; j <= 4; j++)
1441 {
1442 switch (j)
1443 {
1444 case 0: /* First, try sending a CR */
1445 SERIAL_FLUSH_INPUT (mips_desc);
1446 SERIAL_WRITE (mips_desc, "\r", 1);
1447 break;
1448 case 1: /* First, try sending a break */
1449 SERIAL_SEND_BREAK (mips_desc);
1450 break;
1451 case 2: /* Then, try a ^C */
1452 SERIAL_WRITE (mips_desc, "\003", 1);
1453 break;
1454 case 3: /* Then, try escaping from download */
1455 {
1456 if (mips_monitor != MON_IDT)
1457 {
1458 char tbuff[7];
1459
1460 /* We shouldn't need to send multiple termination
1461 sequences, since the target performs line (or
1462 block) reads, and then processes those
1463 packets. In-case we were downloading a large packet
1464 we flush the output buffer before inserting a
1465 termination sequence. */
1466 SERIAL_FLUSH_OUTPUT (mips_desc);
1467 sprintf (tbuff, "\r/E/E\r");
1468 SERIAL_WRITE (mips_desc, tbuff, 6);
1469 }
1470 else
1471 {
1472 char srec[10];
1473 int i;
1474
1475 /* We are possibly in binary download mode, having
1476 aborted in the middle of an S-record. ^C won't
1477 work because of binary mode. The only reliable way
1478 out is to send enough termination packets (8 bytes)
1479 to fill up and then overflow the largest size
1480 S-record (255 bytes in this case). This amounts to
1481 256/8 + 1 packets.
1482 */
1483
1484 mips_make_srec (srec, '7', 0, NULL, 0);
1485
1486 for (i = 1; i <= 33; i++)
1487 {
1488 SERIAL_WRITE (mips_desc, srec, 8);
1489
1490 if (SERIAL_READCHAR (mips_desc, 0) >= 0)
1491 break; /* Break immediatly if we get something from
1492 the board. */
1493 }
1494 }
1495 }
1496 break;
1497 case 4:
1498 mips_error ("Failed to initialize.");
1499 }
1500
1501 if (mips_expect (mips_monitor_prompt))
1502 break;
1503 }
1504
1505 if (mips_monitor != MON_IDT)
1506 {
1507 /* Sometimes PMON ignores the first few characters in the first
1508 command sent after a load. Sending a blank command gets
1509 around that. */
1510 mips_send_command ("\r", -1);
1511
1512 /* Ensure the correct target state: */
1513 if (mips_monitor != MON_LSI)
1514 mips_send_command ("set regsize 64\r", -1);
1515 mips_send_command ("set hostport tty0\r", -1);
1516 mips_send_command ("set brkcmd \"\"\r", -1);
1517 /* Delete all the current breakpoints: */
1518 mips_send_command ("db *\r", -1);
1519 /* NOTE: PMON does not have breakpoint support through the
1520 "debug" mode, only at the monitor command-line. */
1521 }
1522
1523 mips_enter_debug ();
1524
1525 /* Clear all breakpoints: */
1526 if ((mips_monitor == MON_IDT
1527 && clear_breakpoint (-1, 0, BREAK_UNUSED) == 0)
1528 || mips_monitor == MON_LSI)
1529 monitor_supports_breakpoints = 1;
1530 else
1531 monitor_supports_breakpoints = 0;
1532
1533 do_cleanups (old_cleanups);
1534
1535 /* If this doesn't call error, we have connected; we don't care if
1536 the request itself succeeds or fails. */
1537
1538 mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err,
1539 mips_receive_wait, NULL);
1540 set_current_frame (create_new_frame (read_fp (), read_pc ()));
1541 select_frame (get_current_frame (), 0);
1542 }
1543
1544 /* Open a connection to the remote board. */
1545 static void
1546 common_open (ops, name, from_tty, new_monitor, new_monitor_prompt)
1547 struct target_ops *ops;
1548 char *name;
1549 int from_tty;
1550 enum mips_monitor_type new_monitor;
1551 char *new_monitor_prompt;
1552 {
1553 char *ptype;
1554 char *serial_port_name;
1555 char *remote_name = 0;
1556 char *local_name = 0;
1557 char **argv;
1558
1559 if (name == 0)
1560 error (
1561 "To open a MIPS remote debugging connection, you need to specify what serial\n\
1562 device is attached to the target board (e.g., /dev/ttya).\n"
1563 "If you want to use TFTP to download to the board, specify the name of a\n"
1564 "temporary file to be used by GDB for downloads as the second argument.\n"
1565 "This filename must be in the form host:filename, where host is the name\n"
1566 "of the host running the TFTP server, and the file must be readable by the\n"
1567 "world. If the local name of the temporary file differs from the name as\n"
1568 "seen from the board via TFTP, specify that name as the third parameter.\n");
1569
1570 /* Parse the serial port name, the optional TFTP name, and the
1571 optional local TFTP name. */
1572 if ((argv = buildargv (name)) == NULL)
1573 nomem (0);
1574 make_cleanup_freeargv (argv);
1575
1576 serial_port_name = strsave (argv[0]);
1577 if (argv[1]) /* remote TFTP name specified? */
1578 {
1579 remote_name = argv[1];
1580 if (argv[2]) /* local TFTP filename specified? */
1581 local_name = argv[2];
1582 }
1583
1584 target_preopen (from_tty);
1585
1586 if (mips_is_open)
1587 unpush_target (current_ops);
1588
1589 /* Open and initialize the serial port. */
1590 mips_desc = SERIAL_OPEN (serial_port_name);
1591 if (mips_desc == (serial_t) NULL)
1592 perror_with_name (serial_port_name);
1593
1594 if (baud_rate != -1)
1595 {
1596 if (SERIAL_SETBAUDRATE (mips_desc, baud_rate))
1597 {
1598 SERIAL_CLOSE (mips_desc);
1599 perror_with_name (serial_port_name);
1600 }
1601 }
1602
1603 SERIAL_RAW (mips_desc);
1604
1605 /* Open and initialize the optional download port. If it is in the form
1606 hostname#portnumber, it's a UDP socket. If it is in the form
1607 hostname:filename, assume it's the TFTP filename that must be
1608 passed to the DDB board to tell it where to get the load file. */
1609 if (remote_name)
1610 {
1611 if (strchr (remote_name, '#'))
1612 {
1613 udp_desc = SERIAL_OPEN (remote_name);
1614 if (!udp_desc)
1615 perror_with_name ("Unable to open UDP port");
1616 udp_in_use = 1;
1617 }
1618 else
1619 {
1620 /* Save the remote and local names of the TFTP temp file. If
1621 the user didn't specify a local name, assume it's the same
1622 as the part of the remote name after the "host:". */
1623 if (tftp_name)
1624 free (tftp_name);
1625 if (tftp_localname)
1626 free (tftp_localname);
1627 if (local_name == NULL)
1628 if ((local_name = strchr (remote_name, ':')) != NULL)
1629 local_name++; /* skip over the colon */
1630 if (local_name == NULL)
1631 local_name = remote_name; /* local name same as remote name */
1632 tftp_name = strsave (remote_name);
1633 tftp_localname = strsave (local_name);
1634 tftp_in_use = 1;
1635 }
1636 }
1637
1638 current_ops = ops;
1639 mips_is_open = 1;
1640
1641 /* Reset the expected monitor prompt if it's never been set before. */
1642 if (mips_monitor_prompt == NULL)
1643 mips_monitor_prompt = strsave (new_monitor_prompt);
1644 mips_monitor = new_monitor;
1645
1646 mips_initialize ();
1647
1648 if (from_tty)
1649 printf_unfiltered ("Remote MIPS debugging using %s\n", serial_port_name);
1650
1651 /* Switch to using remote target now. */
1652 push_target (ops);
1653
1654 /* FIXME: Should we call start_remote here? */
1655
1656 /* Try to figure out the processor model if possible. */
1657 ptype = mips_read_processor_type ();
1658 if (ptype)
1659 mips_set_processor_type_command (strsave (ptype), 0);
1660
1661 /* This is really the job of start_remote however, that makes an assumption
1662 that the target is about to print out a status message of some sort. That
1663 doesn't happen here (in fact, it may not be possible to get the monitor to
1664 send the appropriate packet). */
1665
1666 flush_cached_frames ();
1667 registers_changed ();
1668 stop_pc = read_pc ();
1669 set_current_frame (create_new_frame (read_fp (), stop_pc));
1670 select_frame (get_current_frame (), 0);
1671 print_stack_frame (selected_frame, -1, 1);
1672 free (serial_port_name);
1673 }
1674
1675 static void
1676 mips_open (name, from_tty)
1677 char *name;
1678 int from_tty;
1679 {
1680 common_open (&mips_ops, name, from_tty, MON_IDT, TARGET_MONITOR_PROMPT);
1681 }
1682
1683 static void
1684 pmon_open (name, from_tty)
1685 char *name;
1686 int from_tty;
1687 {
1688 common_open (&pmon_ops, name, from_tty, MON_PMON, "PMON> ");
1689 }
1690
1691 static void
1692 ddb_open (name, from_tty)
1693 char *name;
1694 int from_tty;
1695 {
1696 common_open (&ddb_ops, name, from_tty, MON_DDB, "NEC010>");
1697 }
1698
1699 static void
1700 lsi_open (name, from_tty)
1701 char *name;
1702 int from_tty;
1703 {
1704 int i;
1705
1706 /* Clear the LSI breakpoint table. */
1707 for (i = 0; i < MAX_LSI_BREAKPOINTS; i++)
1708 lsi_breakpoints[i].type = BREAK_UNUSED;
1709
1710 common_open (&lsi_ops, name, from_tty, MON_LSI, "PMON> ");
1711 }
1712
1713 /* Close a connection to the remote board. */
1714
1715 static void
1716 mips_close (quitting)
1717 int quitting;
1718 {
1719 if (mips_is_open)
1720 {
1721 /* Get the board out of remote debugging mode. */
1722 (void) mips_exit_debug ();
1723
1724 close_ports ();
1725 }
1726 }
1727
1728 /* Detach from the remote board. */
1729
1730 static void
1731 mips_detach (args, from_tty)
1732 char *args;
1733 int from_tty;
1734 {
1735 if (args)
1736 error ("Argument given to \"detach\" when remotely debugging.");
1737
1738 pop_target ();
1739
1740 mips_close (1);
1741
1742 if (from_tty)
1743 printf_unfiltered ("Ending remote MIPS debugging.\n");
1744 }
1745
1746 /* Tell the target board to resume. This does not wait for a reply
1747 from the board, except in the case of single-stepping on LSI boards,
1748 where PMON does return a reply. */
1749
1750 static void
1751 mips_resume (pid, step, siggnal)
1752 int pid, step;
1753 enum target_signal siggnal;
1754 {
1755 int err;
1756
1757 /* LSI PMON requires returns a reply packet "0x1 s 0x0 0x57f" after
1758 a single step, so we wait for that. */
1759 mips_request (step ? 's' : 'c',
1760 (unsigned int) 1,
1761 (unsigned int) siggnal,
1762 mips_monitor == MON_LSI && step ? &err : (int *) NULL,
1763 mips_receive_wait, NULL);
1764 }
1765
1766 /* Return the signal corresponding to SIG, where SIG is the number which
1767 the MIPS protocol uses for the signal. */
1768 enum target_signal
1769 mips_signal_from_protocol (sig)
1770 int sig;
1771 {
1772 /* We allow a few more signals than the IDT board actually returns, on
1773 the theory that there is at least *some* hope that perhaps the numbering
1774 for these signals is widely agreed upon. */
1775 if (sig <= 0
1776 || sig > 31)
1777 return TARGET_SIGNAL_UNKNOWN;
1778
1779 /* Don't want to use target_signal_from_host because we are converting
1780 from MIPS signal numbers, not host ones. Our internal numbers
1781 match the MIPS numbers for the signals the board can return, which
1782 are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */
1783 return (enum target_signal) sig;
1784 }
1785
1786 /* Wait until the remote stops, and return a wait status. */
1787
1788 static int
1789 mips_wait (pid, status)
1790 int pid;
1791 struct target_waitstatus *status;
1792 {
1793 int rstatus;
1794 int err;
1795 char buff[DATA_MAXLEN];
1796 int rpc, rfp, rsp;
1797 char flags[20];
1798 int nfields;
1799 int i;
1800
1801 interrupt_count = 0;
1802 hit_watchpoint = 0;
1803
1804 /* If we have not sent a single step or continue command, then the
1805 board is waiting for us to do something. Return a status
1806 indicating that it is stopped. */
1807 if (!mips_need_reply)
1808 {
1809 status->kind = TARGET_WAITKIND_STOPPED;
1810 status->value.sig = TARGET_SIGNAL_TRAP;
1811 return 0;
1812 }
1813
1814 /* No timeout; we sit here as long as the program continues to execute. */
1815 mips_wait_flag = 1;
1816 rstatus = mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err, -1,
1817 buff);
1818 mips_wait_flag = 0;
1819 if (err)
1820 mips_error ("Remote failure: %s", safe_strerror (errno));
1821
1822 /* On returning from a continue, the PMON monitor seems to start
1823 echoing back the messages we send prior to sending back the
1824 ACK. The code can cope with this, but to try and avoid the
1825 unnecessary serial traffic, and "spurious" characters displayed
1826 to the user, we cheat and reset the debug protocol. The problems
1827 seems to be caused by a check on the number of arguments, and the
1828 command length, within the monitor causing it to echo the command
1829 as a bad packet. */
1830 if (mips_monitor == MON_PMON)
1831 {
1832 mips_exit_debug ();
1833 mips_enter_debug ();
1834 }
1835
1836 /* See if we got back extended status. If so, pick out the pc, fp, sp, etc... */
1837
1838 nfields = sscanf (buff, "0x%*x %*c 0x%*x 0x%*x 0x%x 0x%x 0x%x 0x%*x %s",
1839 &rpc, &rfp, &rsp, flags);
1840 if (nfields >= 3)
1841 {
1842 char buf[MAX_REGISTER_RAW_SIZE];
1843
1844 store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rpc);
1845 supply_register (PC_REGNUM, buf);
1846
1847 store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rfp);
1848 supply_register (30, buf); /* This register they are avoiding and so it is unnamed */
1849
1850 store_unsigned_integer (buf, REGISTER_RAW_SIZE (SP_REGNUM), rsp);
1851 supply_register (SP_REGNUM, buf);
1852
1853 store_unsigned_integer (buf, REGISTER_RAW_SIZE (FP_REGNUM), 0);
1854 supply_register (FP_REGNUM, buf);
1855
1856 if (nfields == 9)
1857 {
1858 int i;
1859
1860 for (i = 0; i <= 2; i++)
1861 if (flags[i] == 'r' || flags[i] == 'w')
1862 hit_watchpoint = 1;
1863 else if (flags[i] == '\000')
1864 break;
1865 }
1866 }
1867
1868 if (strcmp (target_shortname, "lsi") == 0)
1869 {
1870 #if 0
1871 /* If this is an LSI PMON target, see if we just hit a hardrdware watchpoint.
1872 Right now, PMON doesn't give us enough information to determine which
1873 breakpoint we hit. So we have to look up the PC in our own table
1874 of breakpoints, and if found, assume it's just a normal instruction
1875 fetch breakpoint, not a data watchpoint. FIXME when PMON
1876 provides some way to tell us what type of breakpoint it is. */
1877 int i;
1878 CORE_ADDR pc = read_pc ();
1879
1880 hit_watchpoint = 1;
1881 for (i = 0; i < MAX_LSI_BREAKPOINTS; i++)
1882 {
1883 if (lsi_breakpoints[i].addr == pc
1884 && lsi_breakpoints[i].type == BREAK_FETCH)
1885 {
1886 hit_watchpoint = 0;
1887 break;
1888 }
1889 }
1890 #else
1891 /* If a data breakpoint was hit, PMON returns the following packet:
1892 0x1 c 0x0 0x57f 0x1
1893 The return packet from an ordinary breakpoint doesn't have the
1894 extra 0x01 field tacked onto the end. */
1895 if (nfields == 1 && rpc == 1)
1896 hit_watchpoint = 1;
1897 #endif
1898 }
1899
1900 /* NOTE: The following (sig) numbers are defined by PMON:
1901 SPP_SIGTRAP 5 breakpoint
1902 SPP_SIGINT 2
1903 SPP_SIGSEGV 11
1904 SPP_SIGBUS 10
1905 SPP_SIGILL 4
1906 SPP_SIGFPE 8
1907 SPP_SIGTERM 15 */
1908
1909 /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG
1910 and so on, because the constants we want here are determined by the
1911 MIPS protocol and have nothing to do with what host we are running on. */
1912 if ((rstatus & 0xff) == 0)
1913 {
1914 status->kind = TARGET_WAITKIND_EXITED;
1915 status->value.integer = (((rstatus) >> 8) & 0xff);
1916 }
1917 else if ((rstatus & 0xff) == 0x7f)
1918 {
1919 status->kind = TARGET_WAITKIND_STOPPED;
1920 status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0xff);
1921
1922 /* If the stop PC is in the _exit function, assume
1923 we hit the 'break 0x3ff' instruction in _exit, so this
1924 is not a normal breakpoint. */
1925 if (strcmp (target_shortname, "lsi") == 0)
1926 {
1927 char *func_name;
1928 CORE_ADDR func_start;
1929 CORE_ADDR pc = read_pc ();
1930
1931 find_pc_partial_function (pc, &func_name, &func_start, NULL);
1932 if (func_name != NULL && strcmp (func_name, "_exit") == 0
1933 && func_start == pc)
1934 status->kind = TARGET_WAITKIND_EXITED;
1935 }
1936 }
1937 else
1938 {
1939 status->kind = TARGET_WAITKIND_SIGNALLED;
1940 status->value.sig = mips_signal_from_protocol (rstatus & 0x7f);
1941 }
1942
1943 return 0;
1944 }
1945
1946 /* We have to map between the register numbers used by gdb and the
1947 register numbers used by the debugging protocol. This function
1948 assumes that we are using tm-mips.h. */
1949
1950 #define REGNO_OFFSET 96
1951
1952 static int
1953 mips_map_regno (regno)
1954 int regno;
1955 {
1956 if (regno < 32)
1957 return regno;
1958 if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32)
1959 return regno - FP0_REGNUM + 32;
1960 switch (regno)
1961 {
1962 case PC_REGNUM:
1963 return REGNO_OFFSET + 0;
1964 case CAUSE_REGNUM:
1965 return REGNO_OFFSET + 1;
1966 case HI_REGNUM:
1967 return REGNO_OFFSET + 2;
1968 case LO_REGNUM:
1969 return REGNO_OFFSET + 3;
1970 case FCRCS_REGNUM:
1971 return REGNO_OFFSET + 4;
1972 case FCRIR_REGNUM:
1973 return REGNO_OFFSET + 5;
1974 default:
1975 /* FIXME: Is there a way to get the status register? */
1976 return 0;
1977 }
1978 }
1979
1980 /* Fetch the remote registers. */
1981
1982 static void
1983 mips_fetch_registers (regno)
1984 int regno;
1985 {
1986 unsigned LONGEST val;
1987 int err;
1988
1989 if (regno == -1)
1990 {
1991 for (regno = 0; regno < NUM_REGS; regno++)
1992 mips_fetch_registers (regno);
1993 return;
1994 }
1995
1996 if (regno == FP_REGNUM || regno == ZERO_REGNUM)
1997 /* FP_REGNUM on the mips is a hack which is just supposed to read
1998 zero (see also mips-nat.c). */
1999 val = 0;
2000 else
2001 {
2002 /* If PMON doesn't support this register, don't waste serial
2003 bandwidth trying to read it. */
2004 int pmon_reg = mips_map_regno (regno);
2005 if (regno != 0 && pmon_reg == 0)
2006 val = 0;
2007 else
2008 {
2009 /* Unfortunately the PMON version in the Vr4300 board has been
2010 compiled without the 64bit register access commands. This
2011 means we cannot get hold of the full register width. */
2012 if (mips_monitor == MON_DDB)
2013 val = (unsigned) mips_request ('t', (unsigned int) pmon_reg,
2014 (unsigned int) 0, &err, mips_receive_wait, NULL);
2015 else
2016 val = mips_request ('r', (unsigned int) pmon_reg,
2017 (unsigned int) 0, &err, mips_receive_wait, NULL);
2018 if (err)
2019 mips_error ("Can't read register %d: %s", regno,
2020 safe_strerror (errno));
2021 }
2022 }
2023
2024 {
2025 char buf[MAX_REGISTER_RAW_SIZE];
2026
2027 /* We got the number the register holds, but gdb expects to see a
2028 value in the target byte ordering. */
2029 store_unsigned_integer (buf, REGISTER_RAW_SIZE (regno), val);
2030 supply_register (regno, buf);
2031 }
2032 }
2033
2034 /* Prepare to store registers. The MIPS protocol can store individual
2035 registers, so this function doesn't have to do anything. */
2036
2037 static void
2038 mips_prepare_to_store ()
2039 {
2040 }
2041
2042 /* Store remote register(s). */
2043
2044 static void
2045 mips_store_registers (regno)
2046 int regno;
2047 {
2048 int err;
2049
2050 if (regno == -1)
2051 {
2052 for (regno = 0; regno < NUM_REGS; regno++)
2053 mips_store_registers (regno);
2054 return;
2055 }
2056
2057 mips_request ('R', (unsigned int) mips_map_regno (regno),
2058 read_register (regno),
2059 &err, mips_receive_wait, NULL);
2060 if (err)
2061 mips_error ("Can't write register %d: %s", regno, safe_strerror (errno));
2062 }
2063
2064 /* Fetch a word from the target board. */
2065
2066 static unsigned int
2067 mips_fetch_word (addr)
2068 CORE_ADDR addr;
2069 {
2070 unsigned int val;
2071 int err;
2072
2073 /* FIXME! addr was cast to uint! */
2074 val = mips_request ('d', addr, (unsigned int) 0, &err,
2075 mips_receive_wait, NULL);
2076 if (err)
2077 {
2078 /* Data space failed; try instruction space. */
2079 /* FIXME! addr was cast to uint! */
2080 val = mips_request ('i', addr, (unsigned int) 0, &err,
2081 mips_receive_wait, NULL);
2082 if (err)
2083 mips_error ("Can't read address 0x%s: %s",
2084 paddr_nz (addr), safe_strerror (errno));
2085 }
2086 return val;
2087 }
2088
2089 /* Store a word to the target board. Returns errno code or zero for
2090 success. If OLD_CONTENTS is non-NULL, put the old contents of that
2091 memory location there. */
2092
2093 /* FIXME! make sure only 32-bit quantities get stored! */
2094 static int
2095 mips_store_word (addr, val, old_contents)
2096 CORE_ADDR addr;
2097 unsigned int val;
2098 char *old_contents;
2099 {
2100 int err;
2101 unsigned int oldcontents;
2102
2103 oldcontents = mips_request ('D', addr, (unsigned int) val,
2104 &err,
2105 mips_receive_wait, NULL);
2106 if (err)
2107 {
2108 /* Data space failed; try instruction space. */
2109 oldcontents = mips_request ('I', addr,
2110 (unsigned int) val, &err,
2111 mips_receive_wait, NULL);
2112 if (err)
2113 return errno;
2114 }
2115 if (old_contents != NULL)
2116 store_unsigned_integer (old_contents, 4, oldcontents);
2117 return 0;
2118 }
2119
2120 /* Read or write LEN bytes from inferior memory at MEMADDR,
2121 transferring to or from debugger address MYADDR. Write to inferior
2122 if SHOULD_WRITE is nonzero. Returns length of data written or
2123 read; 0 for error. Note that protocol gives us the correct value
2124 for a longword, since it transfers values in ASCII. We want the
2125 byte values, so we have to swap the longword values. */
2126
2127 static int
2128 mips_xfer_memory (memaddr, myaddr, len, write, ignore)
2129 CORE_ADDR memaddr;
2130 char *myaddr;
2131 int len;
2132 int write;
2133 struct target_ops *ignore;
2134 {
2135 register int i;
2136 /* Round starting address down to longword boundary. */
2137 register CORE_ADDR addr = memaddr & ~3;
2138 /* Round ending address up; get number of longwords that makes. */
2139 register int count = (((memaddr + len) - addr) + 3) / 4;
2140 /* Allocate buffer of that many longwords. */
2141 register char *buffer = alloca (count * 4);
2142
2143 int status;
2144
2145 if (write)
2146 {
2147 /* Fill start and end extra bytes of buffer with existing data. */
2148 if (addr != memaddr || len < 4)
2149 {
2150 /* Need part of initial word -- fetch it. */
2151 store_unsigned_integer (&buffer[0], 4, mips_fetch_word (addr));
2152 }
2153
2154 if (count > 1)
2155 {
2156 /* Need part of last word -- fetch it. FIXME: we do this even
2157 if we don't need it. */
2158 store_unsigned_integer (&buffer[(count - 1) * 4], 4,
2159 mips_fetch_word (addr + (count - 1) * 4));
2160 }
2161
2162 /* Copy data to be written over corresponding part of buffer */
2163
2164 memcpy ((char *) buffer + (memaddr & 3), myaddr, len);
2165
2166 /* Write the entire buffer. */
2167
2168 for (i = 0; i < count; i++, addr += 4)
2169 {
2170 status = mips_store_word (addr,
2171 extract_unsigned_integer (&buffer[i * 4], 4),
2172 NULL);
2173 /* Report each kilobyte (we download 32-bit words at a time) */
2174 if (i % 256 == 255)
2175 {
2176 printf_unfiltered ("*");
2177 gdb_flush (gdb_stdout);
2178 }
2179 if (status)
2180 {
2181 errno = status;
2182 return 0;
2183 }
2184 /* FIXME: Do we want a QUIT here? */
2185 }
2186 if (count >= 256)
2187 printf_unfiltered ("\n");
2188 }
2189 else
2190 {
2191 /* Read all the longwords */
2192 for (i = 0; i < count; i++, addr += 4)
2193 {
2194 store_unsigned_integer (&buffer[i * 4], 4, mips_fetch_word (addr));
2195 QUIT;
2196 }
2197
2198 /* Copy appropriate bytes out of the buffer. */
2199 memcpy (myaddr, buffer + (memaddr & 3), len);
2200 }
2201 return len;
2202 }
2203
2204 /* Print info on this target. */
2205
2206 static void
2207 mips_files_info (ignore)
2208 struct target_ops *ignore;
2209 {
2210 printf_unfiltered ("Debugging a MIPS board over a serial line.\n");
2211 }
2212
2213 /* Kill the process running on the board. This will actually only
2214 work if we are doing remote debugging over the console input. I
2215 think that if IDT/sim had the remote debug interrupt enabled on the
2216 right port, we could interrupt the process with a break signal. */
2217
2218 static void
2219 mips_kill ()
2220 {
2221 if (!mips_wait_flag)
2222 return;
2223
2224 interrupt_count++;
2225
2226 if (interrupt_count >= 2)
2227 {
2228 interrupt_count = 0;
2229
2230 target_terminal_ours ();
2231
2232 if (query ("Interrupted while waiting for the program.\n\
2233 Give up (and stop debugging it)? "))
2234 {
2235 /* Clean up in such a way that mips_close won't try to talk to the
2236 board (it almost surely won't work since we weren't able to talk to
2237 it). */
2238 mips_wait_flag = 0;
2239 close_ports ();
2240
2241 printf_unfiltered ("Ending remote MIPS debugging.\n");
2242 target_mourn_inferior ();
2243
2244 return_to_top_level (RETURN_QUIT);
2245 }
2246
2247 target_terminal_inferior ();
2248 }
2249
2250 if (remote_debug > 0)
2251 printf_unfiltered ("Sending break\n");
2252
2253 SERIAL_SEND_BREAK (mips_desc);
2254
2255 #if 0
2256 if (mips_is_open)
2257 {
2258 char cc;
2259
2260 /* Send a ^C. */
2261 cc = '\003';
2262 SERIAL_WRITE (mips_desc, &cc, 1);
2263 sleep (1);
2264 target_mourn_inferior ();
2265 }
2266 #endif
2267 }
2268
2269 /* Start running on the target board. */
2270
2271 static void
2272 mips_create_inferior (execfile, args, env)
2273 char *execfile;
2274 char *args;
2275 char **env;
2276 {
2277 CORE_ADDR entry_pt;
2278
2279 if (args && *args)
2280 {
2281 warning ("\
2282 Can't pass arguments to remote MIPS board; arguments ignored.");
2283 /* And don't try to use them on the next "run" command. */
2284 execute_command ("set args", 0);
2285 }
2286
2287 if (execfile == 0 || exec_bfd == 0)
2288 error ("No executable file specified");
2289
2290 entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd);
2291
2292 init_wait_for_inferior ();
2293
2294 /* FIXME: Should we set inferior_pid here? */
2295
2296 proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0);
2297 }
2298
2299 /* Clean up after a process. Actually nothing to do. */
2300
2301 static void
2302 mips_mourn_inferior ()
2303 {
2304 if (current_ops != NULL)
2305 unpush_target (current_ops);
2306 generic_mourn_inferior ();
2307 }
2308 \f
2309 /* We can write a breakpoint and read the shadow contents in one
2310 operation. */
2311
2312 /* Insert a breakpoint. On targets that don't have built-in breakpoint
2313 support, we read the contents of the target location and stash it,
2314 then overwrite it with a breakpoint instruction. ADDR is the target
2315 location in the target machine. CONTENTS_CACHE is a pointer to
2316 memory allocated for saving the target contents. It is guaranteed
2317 by the caller to be long enough to save sizeof BREAKPOINT bytes (this
2318 is accomplished via BREAKPOINT_MAX). */
2319
2320 static int
2321 mips_insert_breakpoint (addr, contents_cache)
2322 CORE_ADDR addr;
2323 char *contents_cache;
2324 {
2325 if (monitor_supports_breakpoints)
2326 return set_breakpoint (addr, MIPS_INSTLEN, BREAK_FETCH);
2327 else
2328 return memory_insert_breakpoint (addr, contents_cache);
2329 }
2330
2331 static int
2332 mips_remove_breakpoint (addr, contents_cache)
2333 CORE_ADDR addr;
2334 char *contents_cache;
2335 {
2336 if (monitor_supports_breakpoints)
2337 return clear_breakpoint (addr, MIPS_INSTLEN, BREAK_FETCH);
2338 else
2339 return memory_remove_breakpoint (addr, contents_cache);
2340 }
2341
2342 #if 0 /* currently not used */
2343 /* PMON does not currently provide support for the debug mode 'b'
2344 commands to manipulate breakpoints. However, if we wanted to use
2345 the monitor breakpoints (rather than the GDB BREAK_INSN version)
2346 then this code performs the work needed to leave debug mode,
2347 set/clear the breakpoint, and then return to debug mode. */
2348
2349 #define PMON_MAX_BP (33) /* 32 SW, 1 HW */
2350 static CORE_ADDR mips_pmon_bp_info[PMON_MAX_BP];
2351 /* NOTE: The code relies on this vector being zero-initialised by the system */
2352
2353 static int
2354 pmon_insert_breakpoint (addr, contents_cache)
2355 CORE_ADDR addr;
2356 char *contents_cache;
2357 {
2358 int status;
2359
2360 if (monitor_supports_breakpoints)
2361 {
2362 char tbuff[12]; /* space for breakpoint command */
2363 int bpnum;
2364 CORE_ADDR bpaddr;
2365
2366 /* PMON does not support debug level breakpoint set/remove: */
2367 if (mips_exit_debug ())
2368 mips_error ("Failed to exit debug mode");
2369
2370 sprintf (tbuff, "b %08x\r", addr);
2371 mips_send_command (tbuff, 0);
2372
2373 mips_expect ("Bpt ");
2374
2375 if (!mips_getstring (tbuff, 2))
2376 return 1;
2377 tbuff[2] = '\0'; /* terminate the string */
2378 if (sscanf (tbuff, "%d", &bpnum) != 1)
2379 {
2380 fprintf_unfiltered (gdb_stderr,
2381 "Invalid decimal breakpoint number from target: %s\n", tbuff);
2382 return 1;
2383 }
2384
2385 mips_expect (" = ");
2386
2387 /* Lead in the hex number we are expecting: */
2388 tbuff[0] = '0';
2389 tbuff[1] = 'x';
2390
2391 /* FIXME!! only 8 bytes! need to expand for Bfd64;
2392 which targets return 64-bit addresses? PMON returns only 32! */
2393 if (!mips_getstring (&tbuff[2], 8))
2394 return 1;
2395 tbuff[10] = '\0'; /* terminate the string */
2396
2397 if (sscanf (tbuff, "0x%08x", &bpaddr) != 1)
2398 {
2399 fprintf_unfiltered (gdb_stderr,
2400 "Invalid hex address from target: %s\n", tbuff);
2401 return 1;
2402 }
2403
2404 if (bpnum >= PMON_MAX_BP)
2405 {
2406 fprintf_unfiltered (gdb_stderr,
2407 "Error: Returned breakpoint number %d outside acceptable range (0..%d)\n",
2408 bpnum, PMON_MAX_BP - 1);
2409 return 1;
2410 }
2411
2412 if (bpaddr != addr)
2413 fprintf_unfiltered (gdb_stderr, "Warning: Breakpoint addresses do not match: 0x%x != 0x%x\n", addr, bpaddr);
2414
2415 mips_pmon_bp_info[bpnum] = bpaddr;
2416
2417 mips_expect ("\r\n");
2418 mips_expect (mips_monitor_prompt);
2419
2420 mips_enter_debug ();
2421
2422 return 0;
2423 }
2424
2425 return mips_store_word (addr, BREAK_INSN, contents_cache);
2426 }
2427
2428 static int
2429 pmon_remove_breakpoint (addr, contents_cache)
2430 CORE_ADDR addr;
2431 char *contents_cache;
2432 {
2433 if (monitor_supports_breakpoints)
2434 {
2435 int bpnum;
2436 char tbuff[7]; /* enough for delete breakpoint command */
2437
2438 for (bpnum = 0; bpnum < PMON_MAX_BP; bpnum++)
2439 if (mips_pmon_bp_info[bpnum] == addr)
2440 break;
2441
2442 if (bpnum >= PMON_MAX_BP)
2443 {
2444 fprintf_unfiltered (gdb_stderr,
2445 "pmon_remove_breakpoint: Failed to find breakpoint at address 0x%s\n",
2446 paddr_nz (addr));
2447 return 1;
2448 }
2449
2450 if (mips_exit_debug ())
2451 mips_error ("Failed to exit debug mode");
2452
2453 sprintf (tbuff, "db %02d\r", bpnum);
2454
2455 mips_send_command (tbuff, -1);
2456 /* NOTE: If the breakpoint does not exist then a "Bpt <dd> not
2457 set" message will be returned. */
2458
2459 mips_enter_debug ();
2460
2461 return 0;
2462 }
2463
2464 return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE);
2465 }
2466 #endif
2467
2468
2469 /* Tell whether this target can support a hardware breakpoint. CNT
2470 is the number of hardware breakpoints already installed. This
2471 implements the TARGET_CAN_USE_HARDWARE_WATCHPOINT macro. */
2472
2473 int
2474 remote_mips_can_use_hardware_watchpoint (cnt)
2475 int cnt;
2476 {
2477 return cnt < MAX_LSI_BREAKPOINTS && strcmp (target_shortname, "lsi") == 0;
2478 }
2479
2480
2481 /* Compute a don't care mask for the region bounding ADDR and ADDR + LEN - 1.
2482 This is used for memory ref breakpoints. */
2483
2484 static unsigned long
2485 calculate_mask (addr, len)
2486 CORE_ADDR addr;
2487 int len;
2488 {
2489 unsigned long mask;
2490 int i;
2491
2492 mask = addr ^ (addr + len - 1);
2493
2494 for (i = 32; i >= 0; i--)
2495 if (mask == 0)
2496 break;
2497 else
2498 mask >>= 1;
2499
2500 mask = (unsigned long) 0xffffffff >> i;
2501
2502 return mask;
2503 }
2504
2505
2506 /* Insert a hardware breakpoint. This works only on LSI targets, which
2507 implement ordinary breakpoints using hardware facilities. */
2508
2509 int
2510 remote_mips_insert_hw_breakpoint (addr, contents_cache)
2511 CORE_ADDR addr;
2512 char *contents_cache;
2513 {
2514 if (strcmp (target_shortname, "lsi") == 0)
2515 return mips_insert_breakpoint (addr, contents_cache);
2516 else
2517 return -1;
2518 }
2519
2520
2521 /* Remove a hardware breakpoint. This works only on LSI targets, which
2522 implement ordinary breakpoints using hardware facilities. */
2523
2524 int
2525 remote_mips_remove_hw_breakpoint (addr, contents_cache)
2526 CORE_ADDR addr;
2527 char *contents_cache;
2528 {
2529 if (strcmp (target_shortname, "lsi") == 0)
2530 return mips_remove_breakpoint (addr, contents_cache);
2531 else
2532 return -1;
2533 }
2534
2535 /* Set a data watchpoint. ADDR and LEN should be obvious. TYPE is 0
2536 for a write watchpoint, 1 for a read watchpoint, or 2 for a read/write
2537 watchpoint. */
2538
2539 int
2540 remote_mips_set_watchpoint (addr, len, type)
2541 CORE_ADDR addr;
2542 int len;
2543 int type;
2544 {
2545 if (set_breakpoint (addr, len, type))
2546 return -1;
2547
2548 return 0;
2549 }
2550
2551 int
2552 remote_mips_remove_watchpoint (addr, len, type)
2553 CORE_ADDR addr;
2554 int len;
2555 int type;
2556 {
2557 if (clear_breakpoint (addr, len, type))
2558 return -1;
2559
2560 return 0;
2561 }
2562
2563 int
2564 remote_mips_stopped_by_watchpoint ()
2565 {
2566 return hit_watchpoint;
2567 }
2568
2569
2570 /* Insert a breakpoint. */
2571
2572 static int
2573 set_breakpoint (addr, len, type)
2574 CORE_ADDR addr;
2575 int len;
2576 enum break_type type;
2577 {
2578 return common_breakpoint (1, addr, len, type);
2579 }
2580
2581
2582 /* Clear a breakpoint. */
2583
2584 static int
2585 clear_breakpoint (addr, len, type)
2586 CORE_ADDR addr;
2587 int len;
2588 enum break_type type;
2589 {
2590 return common_breakpoint (0, addr, len, type);
2591 }
2592
2593
2594 /* Check the error code from the return packet for an LSI breakpoint
2595 command. If there's no error, just return 0. If it's a warning,
2596 print the warning text and return 0. If it's an error, print
2597 the error text and return 1. <ADDR> is the address of the breakpoint
2598 that was being set. <RERRFLG> is the error code returned by PMON.
2599 This is a helper function for common_breakpoint. */
2600
2601 static int
2602 check_lsi_error (addr, rerrflg)
2603 CORE_ADDR addr;
2604 int rerrflg;
2605 {
2606 struct lsi_error *err;
2607 char *saddr = paddr_nz (addr); /* printable address string */
2608
2609 if (rerrflg == 0) /* no error */
2610 return 0;
2611
2612 /* Warnings can be ORed together, so check them all. */
2613 if (rerrflg & W_WARN)
2614 {
2615 if (monitor_warnings)
2616 {
2617 int found = 0;
2618 for (err = lsi_warning_table; err->code != 0; err++)
2619 {
2620 if ((err->code & rerrflg) == err->code)
2621 {
2622 found = 1;
2623 fprintf_unfiltered (gdb_stderr,
2624 "common_breakpoint (0x%s): Warning: %s\n",
2625 saddr,
2626 err->string);
2627 }
2628 }
2629 if (!found)
2630 fprintf_unfiltered (gdb_stderr,
2631 "common_breakpoint (0x%s): Unknown warning: 0x%x\n",
2632 saddr,
2633 rerrflg);
2634 }
2635 return 0;
2636 }
2637
2638 /* Errors are unique, i.e. can't be ORed together. */
2639 for (err = lsi_error_table; err->code != 0; err++)
2640 {
2641 if ((err->code & rerrflg) == err->code)
2642 {
2643 fprintf_unfiltered (gdb_stderr,
2644 "common_breakpoint (0x%s): Error: %s\n",
2645 saddr,
2646 err->string);
2647 return 1;
2648 }
2649 }
2650 fprintf_unfiltered (gdb_stderr,
2651 "common_breakpoint (0x%s): Unknown error: 0x%x\n",
2652 saddr,
2653 rerrflg);
2654 return 1;
2655 }
2656
2657
2658 /* This routine sends a breakpoint command to the remote target.
2659
2660 <SET> is 1 if setting a breakpoint, or 0 if clearing a breakpoint.
2661 <ADDR> is the address of the breakpoint.
2662 <LEN> the length of the region to break on.
2663 <TYPE> is the type of breakpoint:
2664 0 = write (BREAK_WRITE)
2665 1 = read (BREAK_READ)
2666 2 = read/write (BREAK_ACCESS)
2667 3 = instruction fetch (BREAK_FETCH)
2668
2669 Return 0 if successful; otherwise 1. */
2670
2671 static int
2672 common_breakpoint (set, addr, len, type)
2673 int set;
2674 CORE_ADDR addr;
2675 int len;
2676 enum break_type type;
2677 {
2678 char buf[DATA_MAXLEN + 1];
2679 char cmd, rcmd;
2680 int rpid, rerrflg, rresponse, rlen;
2681 int nfields;
2682
2683 addr = ADDR_BITS_REMOVE (addr);
2684
2685 if (mips_monitor == MON_LSI)
2686 {
2687 if (set == 0) /* clear breakpoint */
2688 {
2689 /* The LSI PMON "clear breakpoint" has this form:
2690 <pid> 'b' <bptn> 0x0
2691 reply:
2692 <pid> 'b' 0x0 <code>
2693
2694 <bptn> is a breakpoint number returned by an earlier 'B' command.
2695 Possible return codes: OK, E_BPT. */
2696
2697 int i;
2698
2699 /* Search for the breakpoint in the table. */
2700 for (i = 0; i < MAX_LSI_BREAKPOINTS; i++)
2701 if (lsi_breakpoints[i].type == type
2702 && lsi_breakpoints[i].addr == addr
2703 && lsi_breakpoints[i].len == len)
2704 break;
2705
2706 /* Clear the table entry and tell PMON to clear the breakpoint. */
2707 if (i == MAX_LSI_BREAKPOINTS)
2708 {
2709 warning ("common_breakpoint: Attempt to clear bogus breakpoint at %s\n",
2710 paddr_nz (addr));
2711 return 1;
2712 }
2713
2714 lsi_breakpoints[i].type = BREAK_UNUSED;
2715 sprintf (buf, "0x0 b 0x%x 0x0", i);
2716 mips_send_packet (buf, 1);
2717
2718 rlen = mips_receive_packet (buf, 1, mips_receive_wait);
2719 buf[rlen] = '\0';
2720
2721 nfields = sscanf (buf, "0x%x b 0x0 0x%x", &rpid, &rerrflg);
2722 if (nfields != 2)
2723 mips_error ("common_breakpoint: Bad response from remote board: %s", buf);
2724
2725 return (check_lsi_error (addr, rerrflg));
2726 }
2727 else
2728 /* set a breakpoint */
2729 {
2730 /* The LSI PMON "set breakpoint" command has this form:
2731 <pid> 'B' <addr> 0x0
2732 reply:
2733 <pid> 'B' <bptn> <code>
2734
2735 The "set data breakpoint" command has this form:
2736
2737 <pid> 'A' <addr1> <type> [<addr2> [<value>]]
2738
2739 where: type= "0x1" = read
2740 "0x2" = write
2741 "0x3" = access (read or write)
2742
2743 The reply returns two values:
2744 bptn - a breakpoint number, which is a small integer with
2745 possible values of zero through 255.
2746 code - an error return code, a value of zero indicates a
2747 succesful completion, other values indicate various
2748 errors and warnings.
2749
2750 Possible return codes: OK, W_QAL, E_QAL, E_OUT, E_NON.
2751
2752 */
2753
2754 if (type == BREAK_FETCH) /* instruction breakpoint */
2755 {
2756 cmd = 'B';
2757 sprintf (buf, "0x0 B 0x%s 0x0", paddr_nz (addr));
2758 }
2759 else
2760 /* watchpoint */
2761 {
2762 cmd = 'A';
2763 sprintf (buf, "0x0 A 0x%s 0x%x 0x%s", paddr_nz (addr),
2764 type == BREAK_READ ? 1 : (type == BREAK_WRITE ? 2 : 3),
2765 paddr_nz (addr + len - 1));
2766 }
2767 mips_send_packet (buf, 1);
2768
2769 rlen = mips_receive_packet (buf, 1, mips_receive_wait);
2770 buf[rlen] = '\0';
2771
2772 nfields = sscanf (buf, "0x%x %c 0x%x 0x%x",
2773 &rpid, &rcmd, &rresponse, &rerrflg);
2774 if (nfields != 4 || rcmd != cmd || rresponse > 255)
2775 mips_error ("common_breakpoint: Bad response from remote board: %s", buf);
2776
2777 if (rerrflg != 0)
2778 if (check_lsi_error (addr, rerrflg))
2779 return 1;
2780
2781 /* rresponse contains PMON's breakpoint number. Record the
2782 information for this breakpoint so we can clear it later. */
2783 lsi_breakpoints[rresponse].type = type;
2784 lsi_breakpoints[rresponse].addr = addr;
2785 lsi_breakpoints[rresponse].len = len;
2786
2787 return 0;
2788 }
2789 }
2790 else
2791 {
2792 /* On non-LSI targets, the breakpoint command has this form:
2793 0x0 <CMD> <ADDR> <MASK> <FLAGS>
2794 <MASK> is a don't care mask for addresses.
2795 <FLAGS> is any combination of `r', `w', or `f' for read/write/fetch.
2796 */
2797 unsigned long mask;
2798
2799 mask = calculate_mask (addr, len);
2800 addr &= ~mask;
2801
2802 if (set) /* set a breakpoint */
2803 {
2804 char *flags;
2805 switch (type)
2806 {
2807 case BREAK_WRITE: /* write */
2808 flags = "w";
2809 break;
2810 case BREAK_READ: /* read */
2811 flags = "r";
2812 break;
2813 case BREAK_ACCESS: /* read/write */
2814 flags = "rw";
2815 break;
2816 case BREAK_FETCH: /* fetch */
2817 flags = "f";
2818 break;
2819 default:
2820 abort ();
2821 }
2822
2823 cmd = 'B';
2824 sprintf (buf, "0x0 B 0x%s 0x%s %s", paddr_nz (addr),
2825 paddr_nz (mask), flags);
2826 }
2827 else
2828 {
2829 cmd = 'b';
2830 sprintf (buf, "0x0 b 0x%s", paddr_nz (addr));
2831 }
2832
2833 mips_send_packet (buf, 1);
2834
2835 rlen = mips_receive_packet (buf, 1, mips_receive_wait);
2836 buf[rlen] = '\0';
2837
2838 nfields = sscanf (buf, "0x%x %c 0x%x 0x%x",
2839 &rpid, &rcmd, &rerrflg, &rresponse);
2840
2841 if (nfields != 4 || rcmd != cmd)
2842 mips_error ("common_breakpoint: Bad response from remote board: %s",
2843 buf);
2844
2845 if (rerrflg != 0)
2846 {
2847 /* Ddb returns "0x0 b 0x16 0x0\000", whereas
2848 Cogent returns "0x0 b 0xffffffff 0x16\000": */
2849 if (mips_monitor == MON_DDB)
2850 rresponse = rerrflg;
2851 if (rresponse != 22) /* invalid argument */
2852 fprintf_unfiltered (gdb_stderr,
2853 "common_breakpoint (0x%s): Got error: 0x%x\n",
2854 paddr_nz (addr), rresponse);
2855 return 1;
2856 }
2857 }
2858 return 0;
2859 }
2860 \f
2861 static void
2862 send_srec (srec, len, addr)
2863 char *srec;
2864 int len;
2865 CORE_ADDR addr;
2866 {
2867 while (1)
2868 {
2869 int ch;
2870
2871 SERIAL_WRITE (mips_desc, srec, len);
2872
2873 ch = mips_readchar (2);
2874
2875 switch (ch)
2876 {
2877 case SERIAL_TIMEOUT:
2878 error ("Timeout during download.");
2879 break;
2880 case 0x6: /* ACK */
2881 return;
2882 case 0x15: /* NACK */
2883 fprintf_unfiltered (gdb_stderr, "Download got a NACK at byte %d! Retrying.\n", addr);
2884 continue;
2885 default:
2886 error ("Download got unexpected ack char: 0x%x, retrying.\n", ch);
2887 }
2888 }
2889 }
2890
2891 /* Download a binary file by converting it to S records. */
2892
2893 static void
2894 mips_load_srec (args)
2895 char *args;
2896 {
2897 bfd *abfd;
2898 asection *s;
2899 char *buffer, srec[1024];
2900 unsigned int i;
2901 unsigned int srec_frame = 200;
2902 int reclen;
2903 static int hashmark = 1;
2904
2905 buffer = alloca (srec_frame * 2 + 256);
2906
2907 abfd = bfd_openr (args, 0);
2908 if (!abfd)
2909 {
2910 printf_filtered ("Unable to open file %s\n", args);
2911 return;
2912 }
2913
2914 if (bfd_check_format (abfd, bfd_object) == 0)
2915 {
2916 printf_filtered ("File is not an object file\n");
2917 return;
2918 }
2919
2920 /* This actually causes a download in the IDT binary format: */
2921 mips_send_command (LOAD_CMD, 0);
2922
2923 for (s = abfd->sections; s; s = s->next)
2924 {
2925 if (s->flags & SEC_LOAD)
2926 {
2927 unsigned int numbytes;
2928
2929 /* FIXME! vma too small?? */
2930 printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma,
2931 s->vma + s->_raw_size);
2932 gdb_flush (gdb_stdout);
2933
2934 for (i = 0; i < s->_raw_size; i += numbytes)
2935 {
2936 numbytes = min (srec_frame, s->_raw_size - i);
2937
2938 bfd_get_section_contents (abfd, s, buffer, i, numbytes);
2939
2940 reclen = mips_make_srec (srec, '3', s->vma + i, buffer, numbytes);
2941 send_srec (srec, reclen, s->vma + i);
2942
2943 if (hashmark)
2944 {
2945 putchar_unfiltered ('#');
2946 gdb_flush (gdb_stdout);
2947 }
2948
2949 } /* Per-packet (or S-record) loop */
2950
2951 putchar_unfiltered ('\n');
2952 } /* Loadable sections */
2953 }
2954 if (hashmark)
2955 putchar_unfiltered ('\n');
2956
2957 /* Write a type 7 terminator record. no data for a type 7, and there
2958 is no data, so len is 0. */
2959
2960 reclen = mips_make_srec (srec, '7', abfd->start_address, NULL, 0);
2961
2962 send_srec (srec, reclen, abfd->start_address);
2963
2964 SERIAL_FLUSH_INPUT (mips_desc);
2965 }
2966
2967 /*
2968 * mips_make_srec -- make an srecord. This writes each line, one at a
2969 * time, each with it's own header and trailer line.
2970 * An srecord looks like this:
2971 *
2972 * byte count-+ address
2973 * start ---+ | | data +- checksum
2974 * | | | |
2975 * S01000006F6B692D746573742E73726563E4
2976 * S315000448600000000000000000FC00005900000000E9
2977 * S31A0004000023C1400037DE00F023604000377B009020825000348D
2978 * S30B0004485A0000000000004E
2979 * S70500040000F6
2980 *
2981 * S<type><length><address><data><checksum>
2982 *
2983 * Where
2984 * - length
2985 * is the number of bytes following upto the checksum. Note that
2986 * this is not the number of chars following, since it takes two
2987 * chars to represent a byte.
2988 * - type
2989 * is one of:
2990 * 0) header record
2991 * 1) two byte address data record
2992 * 2) three byte address data record
2993 * 3) four byte address data record
2994 * 7) four byte address termination record
2995 * 8) three byte address termination record
2996 * 9) two byte address termination record
2997 *
2998 * - address
2999 * is the start address of the data following, or in the case of
3000 * a termination record, the start address of the image
3001 * - data
3002 * is the data.
3003 * - checksum
3004 * is the sum of all the raw byte data in the record, from the length
3005 * upwards, modulo 256 and subtracted from 255.
3006 *
3007 * This routine returns the length of the S-record.
3008 *
3009 */
3010
3011 static int
3012 mips_make_srec (buf, type, memaddr, myaddr, len)
3013 char *buf;
3014 int type;
3015 CORE_ADDR memaddr;
3016 unsigned char *myaddr;
3017 int len;
3018 {
3019 unsigned char checksum;
3020 int i;
3021
3022 /* Create the header for the srec. addr_size is the number of bytes in the address,
3023 and 1 is the number of bytes in the count. */
3024
3025 /* FIXME!! bigger buf required for 64-bit! */
3026 buf[0] = 'S';
3027 buf[1] = type;
3028 buf[2] = len + 4 + 1; /* len + 4 byte address + 1 byte checksum */
3029 /* This assumes S3 style downloads (4byte addresses). There should
3030 probably be a check, or the code changed to make it more
3031 explicit. */
3032 buf[3] = memaddr >> 24;
3033 buf[4] = memaddr >> 16;
3034 buf[5] = memaddr >> 8;
3035 buf[6] = memaddr;
3036 memcpy (&buf[7], myaddr, len);
3037
3038 /* Note that the checksum is calculated on the raw data, not the
3039 hexified data. It includes the length, address and the data
3040 portions of the packet. */
3041 checksum = 0;
3042 buf += 2; /* Point at length byte */
3043 for (i = 0; i < len + 4 + 1; i++)
3044 checksum += *buf++;
3045
3046 *buf = ~checksum;
3047
3048 return len + 8;
3049 }
3050
3051 /* The following manifest controls whether we enable the simple flow
3052 control support provided by the monitor. If enabled the code will
3053 wait for an affirmative ACK between transmitting packets. */
3054 #define DOETXACK (1)
3055
3056 /* The PMON fast-download uses an encoded packet format constructed of
3057 3byte data packets (encoded as 4 printable ASCII characters), and
3058 escape sequences (preceded by a '/'):
3059
3060 'K' clear checksum
3061 'C' compare checksum (12bit value, not included in checksum calculation)
3062 'S' define symbol name (for addr) terminated with "," and padded to 4char boundary
3063 'Z' zero fill multiple of 3bytes
3064 'B' byte (12bit encoded value, of 8bit data)
3065 'A' address (36bit encoded value)
3066 'E' define entry as original address, and exit load
3067
3068 The packets are processed in 4 character chunks, so the escape
3069 sequences that do not have any data (or variable length data)
3070 should be padded to a 4 character boundary. The decoder will give
3071 an error if the complete message block size is not a multiple of
3072 4bytes (size of record).
3073
3074 The encoding of numbers is done in 6bit fields. The 6bit value is
3075 used to index into this string to get the specific character
3076 encoding for the value: */
3077 static char encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789,.";
3078
3079 /* Convert the number of bits required into an encoded number, 6bits
3080 at a time (range 0..63). Keep a checksum if required (passed
3081 pointer non-NULL). The function returns the number of encoded
3082 characters written into the buffer. */
3083 static int
3084 pmon_makeb64 (v, p, n, chksum)
3085 unsigned long v;
3086 char *p;
3087 int n;
3088 int *chksum;
3089 {
3090 int count = (n / 6);
3091
3092 if ((n % 12) != 0)
3093 {
3094 fprintf_unfiltered (gdb_stderr,
3095 "Fast encoding bitcount must be a multiple of 12bits: %dbit%s\n", n, (n == 1) ? "" : "s");
3096 return (0);
3097 }
3098 if (n > 36)
3099 {
3100 fprintf_unfiltered (gdb_stderr,
3101 "Fast encoding cannot process more than 36bits at the moment: %dbits\n", n);
3102 return (0);
3103 }
3104
3105 /* Deal with the checksum: */
3106 if (chksum != NULL)
3107 {
3108 switch (n)
3109 {
3110 case 36:
3111 *chksum += ((v >> 24) & 0xFFF);
3112 case 24:
3113 *chksum += ((v >> 12) & 0xFFF);
3114 case 12:
3115 *chksum += ((v >> 0) & 0xFFF);
3116 }
3117 }
3118
3119 do
3120 {
3121 n -= 6;
3122 *p++ = encoding[(v >> n) & 0x3F];
3123 }
3124 while (n > 0);
3125
3126 return (count);
3127 }
3128
3129 /* Shorthand function (that could be in-lined) to output the zero-fill
3130 escape sequence into the data stream. */
3131 static int
3132 pmon_zeroset (recsize, buff, amount, chksum)
3133 int recsize;
3134 char **buff;
3135 int *amount;
3136 unsigned int *chksum;
3137 {
3138 int count;
3139
3140 sprintf (*buff, "/Z");
3141 count = pmon_makeb64 (*amount, (*buff + 2), 12, chksum);
3142 *buff += (count + 2);
3143 *amount = 0;
3144 return (recsize + count + 2);
3145 }
3146
3147 static int
3148 pmon_checkset (recsize, buff, value)
3149 int recsize;
3150 char **buff;
3151 int *value;
3152 {
3153 int count;
3154
3155 /* Add the checksum (without updating the value): */
3156 sprintf (*buff, "/C");
3157 count = pmon_makeb64 (*value, (*buff + 2), 12, NULL);
3158 *buff += (count + 2);
3159 sprintf (*buff, "\n");
3160 *buff += 2; /* include zero terminator */
3161 /* Forcing a checksum validation clears the sum: */
3162 *value = 0;
3163 return (recsize + count + 3);
3164 }
3165
3166 /* Amount of padding we leave after at the end of the output buffer,
3167 for the checksum and line termination characters: */
3168 #define CHECKSIZE (4 + 4 + 4 + 2)
3169 /* zero-fill, checksum, transfer end and line termination space. */
3170
3171 /* The amount of binary data loaded from the object file in a single
3172 operation: */
3173 #define BINCHUNK (1024)
3174
3175 /* Maximum line of data accepted by the monitor: */
3176 #define MAXRECSIZE (550)
3177 /* NOTE: This constant depends on the monitor being used. This value
3178 is for PMON 5.x on the Cogent Vr4300 board. */
3179
3180 static void
3181 pmon_make_fastrec (outbuf, inbuf, inptr, inamount, recsize, csum, zerofill)
3182 char **outbuf;
3183 unsigned char *inbuf;
3184 int *inptr;
3185 int inamount;
3186 int *recsize;
3187 unsigned int *csum;
3188 unsigned int *zerofill;
3189 {
3190 int count = 0;
3191 char *p = *outbuf;
3192
3193 /* This is a simple check to ensure that our data will fit within
3194 the maximum allowable record size. Each record output is 4bytes
3195 in length. We must allow space for a pending zero fill command,
3196 the record, and a checksum record. */
3197 while ((*recsize < (MAXRECSIZE - CHECKSIZE)) && ((inamount - *inptr) > 0))
3198 {
3199 /* Process the binary data: */
3200 if ((inamount - *inptr) < 3)
3201 {
3202 if (*zerofill != 0)
3203 *recsize = pmon_zeroset (*recsize, &p, zerofill, csum);
3204 sprintf (p, "/B");
3205 count = pmon_makeb64 (inbuf[*inptr], &p[2], 12, csum);
3206 p += (2 + count);
3207 *recsize += (2 + count);
3208 (*inptr)++;
3209 }
3210 else
3211 {
3212 unsigned int value = ((inbuf[*inptr + 0] << 16) | (inbuf[*inptr + 1] << 8) | inbuf[*inptr + 2]);
3213 /* Simple check for zero data. TODO: A better check would be
3214 to check the last, and then the middle byte for being zero
3215 (if the first byte is not). We could then check for
3216 following runs of zeros, and if above a certain size it is
3217 worth the 4 or 8 character hit of the byte insertions used
3218 to pad to the start of the zeroes. NOTE: This also depends
3219 on the alignment at the end of the zero run. */
3220 if (value == 0x00000000)
3221 {
3222 (*zerofill)++;
3223 if (*zerofill == 0xFFF) /* 12bit counter */
3224 *recsize = pmon_zeroset (*recsize, &p, zerofill, csum);
3225 }
3226 else
3227 {
3228 if (*zerofill != 0)
3229 *recsize = pmon_zeroset (*recsize, &p, zerofill, csum);
3230 count = pmon_makeb64 (value, p, 24, csum);
3231 p += count;
3232 *recsize += count;
3233 }
3234 *inptr += 3;
3235 }
3236 }
3237
3238 *outbuf = p;
3239 return;
3240 }
3241
3242 static int
3243 pmon_check_ack (mesg)
3244 char *mesg;
3245 {
3246 #if defined(DOETXACK)
3247 int c;
3248
3249 if (!tftp_in_use)
3250 {
3251 c = SERIAL_READCHAR (udp_in_use ? udp_desc : mips_desc, 2);
3252 if ((c == SERIAL_TIMEOUT) || (c != 0x06))
3253 {
3254 fprintf_unfiltered (gdb_stderr,
3255 "Failed to receive valid ACK for %s\n", mesg);
3256 return (-1); /* terminate the download */
3257 }
3258 }
3259 #endif /* DOETXACK */
3260 return (0);
3261 }
3262
3263 /* pmon_download - Send a sequence of characters to the PMON download port,
3264 which is either a serial port or a UDP socket. */
3265
3266 static void
3267 pmon_start_download ()
3268 {
3269 if (tftp_in_use)
3270 {
3271 /* Create the temporary download file. */
3272 if ((tftp_file = fopen (tftp_localname, "w")) == NULL)
3273 perror_with_name (tftp_localname);
3274 }
3275 else
3276 {
3277 mips_send_command (udp_in_use ? LOAD_CMD_UDP : LOAD_CMD, 0);
3278 mips_expect ("Downloading from ");
3279 mips_expect (udp_in_use ? "udp" : "tty0");
3280 mips_expect (", ^C to abort\r\n");
3281 }
3282 }
3283
3284 static int
3285 mips_expect_download (char *string)
3286 {
3287 if (!mips_expect (string))
3288 {
3289 fprintf_unfiltered (gdb_stderr, "Load did not complete successfully.\n");
3290 if (tftp_in_use)
3291 remove (tftp_localname); /* Remove temporary file */
3292 return 0;
3293 }
3294 else
3295 return 1;
3296 }
3297
3298 static void
3299 pmon_end_download (final, bintotal)
3300 int final;
3301 int bintotal;
3302 {
3303 char hexnumber[9]; /* includes '\0' space */
3304
3305 if (tftp_in_use)
3306 {
3307 static char *load_cmd_prefix = "load -b -s ";
3308 char *cmd;
3309 struct stat stbuf;
3310
3311 /* Close off the temporary file containing the load data. */
3312 fclose (tftp_file);
3313 tftp_file = NULL;
3314
3315 /* Make the temporary file readable by the world. */
3316 if (stat (tftp_localname, &stbuf) == 0)
3317 chmod (tftp_localname, stbuf.st_mode | S_IROTH);
3318
3319 /* Must reinitialize the board to prevent PMON from crashing. */
3320 mips_send_command ("initEther\r", -1);
3321
3322 /* Send the load command. */
3323 cmd = xmalloc (strlen (load_cmd_prefix) + strlen (tftp_name) + 2);
3324 strcpy (cmd, load_cmd_prefix);
3325 strcat (cmd, tftp_name);
3326 strcat (cmd, "\r");
3327 mips_send_command (cmd, 0);
3328 free (cmd);
3329 if (!mips_expect_download ("Downloading from "))
3330 return;
3331 if (!mips_expect_download (tftp_name))
3332 return;
3333 if (!mips_expect_download (", ^C to abort\r\n"))
3334 return;
3335 }
3336
3337 /* Wait for the stuff that PMON prints after the load has completed.
3338 The timeout value for use in the tftp case (15 seconds) was picked
3339 arbitrarily but might be too small for really large downloads. FIXME. */
3340 if (mips_monitor == MON_LSI)
3341 {
3342 pmon_check_ack ("termination");
3343 mips_expect_timeout ("Entry address is ", tftp_in_use ? 15 : 2);
3344 }
3345 else
3346 mips_expect_timeout ("Entry Address = ", tftp_in_use ? 15 : 2);
3347
3348 sprintf (hexnumber, "%x", final);
3349 mips_expect (hexnumber);
3350 mips_expect ("\r\n");
3351 if (mips_monitor != MON_LSI)
3352 pmon_check_ack ("termination");
3353 mips_expect ("\r\ntotal = 0x");
3354 sprintf (hexnumber, "%x", bintotal);
3355 mips_expect (hexnumber);
3356 if (!mips_expect_download (" bytes\r\n"))
3357 return;
3358
3359 if (tftp_in_use)
3360 remove (tftp_localname); /* Remove temporary file */
3361 }
3362
3363 static void
3364 pmon_download (buffer, length)
3365 char *buffer;
3366 int length;
3367 {
3368 if (tftp_in_use)
3369 fwrite (buffer, 1, length, tftp_file);
3370 else
3371 SERIAL_WRITE (udp_in_use ? udp_desc : mips_desc, buffer, length);
3372 }
3373
3374 static void
3375 pmon_load_fast (file)
3376 char *file;
3377 {
3378 bfd *abfd;
3379 asection *s;
3380 unsigned char *binbuf;
3381 char *buffer;
3382 int reclen;
3383 unsigned int csum = 0;
3384 int hashmark = !tftp_in_use;
3385 int bintotal = 0;
3386 int final = 0;
3387 int finished = 0;
3388
3389 buffer = (char *) xmalloc (MAXRECSIZE + 1);
3390 binbuf = (unsigned char *) xmalloc (BINCHUNK);
3391
3392 abfd = bfd_openr (file, 0);
3393 if (!abfd)
3394 {
3395 printf_filtered ("Unable to open file %s\n", file);
3396 return;
3397 }
3398
3399 if (bfd_check_format (abfd, bfd_object) == 0)
3400 {
3401 printf_filtered ("File is not an object file\n");
3402 return;
3403 }
3404
3405 /* Setup the required download state: */
3406 mips_send_command ("set dlproto etxack\r", -1);
3407 mips_send_command ("set dlecho off\r", -1);
3408 /* NOTE: We get a "cannot set variable" message if the variable is
3409 already defined to have the argument we give. The code doesn't
3410 care, since it just scans to the next prompt anyway. */
3411 /* Start the download: */
3412 pmon_start_download ();
3413
3414 /* Zero the checksum */
3415 sprintf (buffer, "/Kxx\n");
3416 reclen = strlen (buffer);
3417 pmon_download (buffer, reclen);
3418 finished = pmon_check_ack ("/Kxx");
3419
3420 for (s = abfd->sections; s && !finished; s = s->next)
3421 if (s->flags & SEC_LOAD) /* only deal with loadable sections */
3422 {
3423 bintotal += s->_raw_size;
3424 final = (s->vma + s->_raw_size);
3425
3426 printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, (unsigned int) s->vma,
3427 (unsigned int) (s->vma + s->_raw_size));
3428 gdb_flush (gdb_stdout);
3429
3430 /* Output the starting address */
3431 sprintf (buffer, "/A");
3432 reclen = pmon_makeb64 (s->vma, &buffer[2], 36, &csum);
3433 buffer[2 + reclen] = '\n';
3434 buffer[3 + reclen] = '\0';
3435 reclen += 3; /* for the initial escape code and carriage return */
3436 pmon_download (buffer, reclen);
3437 finished = pmon_check_ack ("/A");
3438
3439 if (!finished)
3440 {
3441 unsigned int binamount;
3442 unsigned int zerofill = 0;
3443 char *bp = buffer;
3444 unsigned int i;
3445
3446 reclen = 0;
3447
3448 for (i = 0; ((i < s->_raw_size) && !finished); i += binamount)
3449 {
3450 int binptr = 0;
3451
3452 binamount = min (BINCHUNK, s->_raw_size - i);
3453
3454 bfd_get_section_contents (abfd, s, binbuf, i, binamount);
3455
3456 /* This keeps a rolling checksum, until we decide to output
3457 the line: */
3458 for (; ((binamount - binptr) > 0);)
3459 {
3460 pmon_make_fastrec (&bp, binbuf, &binptr, binamount, &reclen, &csum, &zerofill);
3461 if (reclen >= (MAXRECSIZE - CHECKSIZE))
3462 {
3463 reclen = pmon_checkset (reclen, &bp, &csum);
3464 pmon_download (buffer, reclen);
3465 finished = pmon_check_ack ("data record");
3466 if (finished)
3467 {
3468 zerofill = 0; /* do not transmit pending zerofills */
3469 break;
3470 }
3471
3472 if (hashmark)
3473 {
3474 putchar_unfiltered ('#');
3475 gdb_flush (gdb_stdout);
3476 }
3477
3478 bp = buffer;
3479 reclen = 0; /* buffer processed */
3480 }
3481 }
3482 }
3483
3484 /* Ensure no out-standing zerofill requests: */
3485 if (zerofill != 0)
3486 reclen = pmon_zeroset (reclen, &bp, &zerofill, &csum);
3487
3488 /* and then flush the line: */
3489 if (reclen > 0)
3490 {
3491 reclen = pmon_checkset (reclen, &bp, &csum);
3492 /* Currently pmon_checkset outputs the line terminator by
3493 default, so we write out the buffer so far: */
3494 pmon_download (buffer, reclen);
3495 finished = pmon_check_ack ("record remnant");
3496 }
3497 }
3498
3499 putchar_unfiltered ('\n');
3500 }
3501
3502 /* Terminate the transfer. We know that we have an empty output
3503 buffer at this point. */
3504 sprintf (buffer, "/E/E\n"); /* include dummy padding characters */
3505 reclen = strlen (buffer);
3506 pmon_download (buffer, reclen);
3507
3508 if (finished)
3509 { /* Ignore the termination message: */
3510 SERIAL_FLUSH_INPUT (udp_in_use ? udp_desc : mips_desc);
3511 }
3512 else
3513 { /* Deal with termination message: */
3514 pmon_end_download (final, bintotal);
3515 }
3516
3517 return;
3518 }
3519
3520 /* mips_load -- download a file. */
3521
3522 static void
3523 mips_load (file, from_tty)
3524 char *file;
3525 int from_tty;
3526 {
3527 /* Get the board out of remote debugging mode. */
3528 if (mips_exit_debug ())
3529 error ("mips_load: Couldn't get into monitor mode.");
3530
3531 if (mips_monitor != MON_IDT)
3532 pmon_load_fast (file);
3533 else
3534 mips_load_srec (file);
3535
3536 mips_initialize ();
3537
3538 /* Finally, make the PC point at the start address */
3539 if (mips_monitor != MON_IDT)
3540 {
3541 /* Work around problem where PMON monitor updates the PC after a load
3542 to a different value than GDB thinks it has. The following ensures
3543 that the write_pc() WILL update the PC value: */
3544 register_valid[PC_REGNUM] = 0;
3545 }
3546 if (exec_bfd)
3547 write_pc (bfd_get_start_address (exec_bfd));
3548
3549 inferior_pid = 0; /* No process now */
3550
3551 /* This is necessary because many things were based on the PC at the time that
3552 we attached to the monitor, which is no longer valid now that we have loaded
3553 new code (and just changed the PC). Another way to do this might be to call
3554 normal_stop, except that the stack may not be valid, and things would get
3555 horribly confused... */
3556
3557 clear_symtab_users ();
3558 }
3559
3560
3561 /* Pass the command argument as a packet to PMON verbatim. */
3562
3563 static void
3564 pmon_command (args, from_tty)
3565 char *args;
3566 int from_tty;
3567 {
3568 char buf[DATA_MAXLEN + 1];
3569 int rlen;
3570
3571 sprintf (buf, "0x0 %s", args);
3572 mips_send_packet (buf, 1);
3573 printf_filtered ("Send packet: %s\n", buf);
3574
3575 rlen = mips_receive_packet (buf, 1, mips_receive_wait);
3576 buf[rlen] = '\0';
3577 printf_filtered ("Received packet: %s\n", buf);
3578 }
3579 \f
3580 void
3581 _initialize_remote_mips ()
3582 {
3583 /* Initialize the fields in mips_ops that are common to all four targets. */
3584 mips_ops.to_longname = "Remote MIPS debugging over serial line";
3585 mips_ops.to_close = mips_close;
3586 mips_ops.to_detach = mips_detach;
3587 mips_ops.to_resume = mips_resume;
3588 mips_ops.to_fetch_registers = mips_fetch_registers;
3589 mips_ops.to_store_registers = mips_store_registers;
3590 mips_ops.to_prepare_to_store = mips_prepare_to_store;
3591 mips_ops.to_xfer_memory = mips_xfer_memory;
3592 mips_ops.to_files_info = mips_files_info;
3593 mips_ops.to_insert_breakpoint = mips_insert_breakpoint;
3594 mips_ops.to_remove_breakpoint = mips_remove_breakpoint;
3595 mips_ops.to_kill = mips_kill;
3596 mips_ops.to_load = mips_load;
3597 mips_ops.to_create_inferior = mips_create_inferior;
3598 mips_ops.to_mourn_inferior = mips_mourn_inferior;
3599 mips_ops.to_stratum = process_stratum;
3600 mips_ops.to_has_all_memory = 1;
3601 mips_ops.to_has_memory = 1;
3602 mips_ops.to_has_stack = 1;
3603 mips_ops.to_has_registers = 1;
3604 mips_ops.to_has_execution = 1;
3605 mips_ops.to_magic = OPS_MAGIC;
3606
3607 /* Copy the common fields to all four target vectors. */
3608 pmon_ops = ddb_ops = lsi_ops = mips_ops;
3609
3610 /* Initialize target-specific fields in the target vectors. */
3611 mips_ops.to_shortname = "mips";
3612 mips_ops.to_doc = "\
3613 Debug a board using the MIPS remote debugging protocol over a serial line.\n\
3614 The argument is the device it is connected to or, if it contains a colon,\n\
3615 HOST:PORT to access a board over a network";
3616 mips_ops.to_open = mips_open;
3617 mips_ops.to_wait = mips_wait;
3618
3619 pmon_ops.to_shortname = "pmon";
3620 pmon_ops.to_doc = "\
3621 Debug a board using the PMON MIPS remote debugging protocol over a serial\n\
3622 line. The argument is the device it is connected to or, if it contains a\n\
3623 colon, HOST:PORT to access a board over a network";
3624 pmon_ops.to_open = pmon_open;
3625 pmon_ops.to_wait = mips_wait;
3626
3627 ddb_ops.to_shortname = "ddb";
3628 ddb_ops.to_doc = "\
3629 Debug a board using the PMON MIPS remote debugging protocol over a serial\n\
3630 line. The first argument is the device it is connected to or, if it contains\n\
3631 a colon, HOST:PORT to access a board over a network. The optional second\n\
3632 parameter is the temporary file in the form HOST:FILENAME to be used for\n\
3633 TFTP downloads to the board. The optional third parameter is the local name\n\
3634 of the TFTP temporary file, if it differs from the filename seen by the board.";
3635 ddb_ops.to_open = ddb_open;
3636 ddb_ops.to_wait = mips_wait;
3637
3638 lsi_ops.to_shortname = "lsi";
3639 lsi_ops.to_doc = pmon_ops.to_doc;
3640 lsi_ops.to_open = lsi_open;
3641 lsi_ops.to_wait = mips_wait;
3642
3643 /* Add the targets. */
3644 add_target (&mips_ops);
3645 add_target (&pmon_ops);
3646 add_target (&ddb_ops);
3647 add_target (&lsi_ops);
3648
3649 add_show_from_set (
3650 add_set_cmd ("timeout", no_class, var_zinteger,
3651 (char *) &mips_receive_wait,
3652 "Set timeout in seconds for remote MIPS serial I/O.",
3653 &setlist),
3654 &showlist);
3655
3656 add_show_from_set (
3657 add_set_cmd ("retransmit-timeout", no_class, var_zinteger,
3658 (char *) &mips_retransmit_wait,
3659 "Set retransmit timeout in seconds for remote MIPS serial I/O.\n\
3660 This is the number of seconds to wait for an acknowledgement to a packet\n\
3661 before resending the packet.", &setlist),
3662 &showlist);
3663
3664 add_show_from_set (
3665 add_set_cmd ("syn-garbage-limit", no_class, var_zinteger,
3666 (char *) &mips_syn_garbage,
3667 "Set the maximum number of characters to ignore when scanning for a SYN.\n\
3668 This is the maximum number of characters GDB will ignore when trying to\n\
3669 synchronize with the remote system. A value of -1 means that there is no limit\n\
3670 (Note that these characters are printed out even though they are ignored.)",
3671 &setlist),
3672 &showlist);
3673
3674 add_show_from_set
3675 (add_set_cmd ("monitor-prompt", class_obscure, var_string,
3676 (char *) &mips_monitor_prompt,
3677 "Set the prompt that GDB expects from the monitor.",
3678 &setlist),
3679 &showlist);
3680
3681 add_show_from_set (
3682 add_set_cmd ("monitor-warnings", class_obscure, var_zinteger,
3683 (char *) &monitor_warnings,
3684 "Set printing of monitor warnings.\n"
3685 "When enabled, monitor warnings about hardware breakpoints "
3686 "will be displayed.",
3687 &setlist),
3688 &showlist);
3689
3690 add_com ("pmon <command>", class_obscure, pmon_command,
3691 "Send a packet to PMON (must be in debug mode).");
3692 }