1 /* Remote debugging interface for MIPS remote debugging protocol.
2 Copyright 1993 Free Software Foundation, Inc.
3 Contributed by Cygnus Support. Written by Ian Lance Taylor
6 This file is part of GDB.
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.
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.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
34 /* Prototypes for local functions. */
37 mips_readchar
PARAMS ((int timeout
));
40 mips_receive_header
PARAMS ((unsigned char *hdr
, int *pgarbage
, int ch
,
44 mips_receive_trailer
PARAMS ((unsigned char *trlr
, int *pgarbage
, int *pch
,
47 static int mips_cksum
PARAMS ((const unsigned char *hdr
,
48 const unsigned char *data
,
52 mips_send_packet
PARAMS ((const char *s
, int get_ack
));
55 mips_receive_packet
PARAMS ((char *buff
));
58 mips_request
PARAMS ((char cmd
, unsigned int addr
, unsigned int data
,
62 mips_initialize
PARAMS ((void));
65 mips_open
PARAMS ((char *name
, int from_tty
));
68 mips_close
PARAMS ((int quitting
));
71 mips_detach
PARAMS ((char *args
, int from_tty
));
74 mips_resume
PARAMS ((int pid
, int step
, int siggnal
));
77 mips_wait
PARAMS ((WAITTYPE
*status
));
80 mips_map_regno
PARAMS ((int regno
));
83 mips_fetch_registers
PARAMS ((int regno
));
86 mips_prepare_to_store
PARAMS ((void));
89 mips_store_registers
PARAMS ((int regno
));
92 mips_fetch_word
PARAMS ((CORE_ADDR addr
));
95 mips_store_word
PARAMS ((CORE_ADDR addr
, int value
));
98 mips_xfer_memory
PARAMS ((CORE_ADDR memaddr
, char *myaddr
, int len
,
99 int write
, struct target_ops
*ignore
));
102 mips_files_info
PARAMS ((struct target_ops
*ignore
));
105 mips_load
PARAMS ((char *args
, int from_tty
));
108 mips_create_inferior
PARAMS ((char *execfile
, char *args
, char **env
));
111 mips_mourn_inferior
PARAMS ((void));
113 /* A forward declaration. */
114 extern struct target_ops mips_ops
;
116 /* The MIPS remote debugging interface is built on top of a simple
117 packet protocol. Each packet is organized as follows:
119 SYN The first character is always a SYN (ASCII 026, or ^V). SYN
120 may not appear anywhere else in the packet. Any time a SYN is
121 seen, a new packet should be assumed to have begun.
124 This byte contains the upper five bits of the logical length
125 of the data section, plus a single bit indicating whether this
126 is a data packet or an acknowledgement. The documentation
127 indicates that this bit is 1 for a data packet, but the actual
128 board uses 1 for an acknowledgement. The value of the byte is
129 0x40 + (ack ? 0x20 : 0) + (len >> 6)
130 (we always have 0 <= len < 1024). Acknowledgement packets do
131 not carry data, and must have a data length of 0.
133 LEN1 This byte contains the lower six bits of the logical length of
134 the data section. The value is
137 SEQ This byte contains the six bit sequence number of the packet.
140 An acknowlegment packet contains the sequence number of the
141 packet being acknowledged plus 1 module 64. Data packets are
142 transmitted in sequence. There may only be one outstanding
143 unacknowledged data packet at a time. The sequence numbers
144 are independent in each direction. If an acknowledgement for
145 the previous packet is received (i.e., an acknowledgement with
146 the sequence number of the packet just sent) the packet just
147 sent should be retransmitted. If no acknowledgement is
148 received within a timeout period, the packet should be
149 retransmitted. This has an unfortunate failure condition on a
150 high-latency line, as a delayed acknowledgement may lead to an
151 endless series of duplicate packets.
153 DATA The actual data bytes follow. The following characters are
154 escaped inline with DLE (ASCII 020, or ^P):
160 The additional DLE characters are not counted in the logical
161 length stored in the TYPE_LEN and LEN1 bytes.
166 These bytes contain an 18 bit checksum of the complete
167 contents of the packet excluding the SEQ byte and the
168 CSUM[123] bytes. The checksum is simply the twos complement
169 addition of all the bytes treated as unsigned characters. The
170 values of the checksum bytes are:
171 CSUM1: 0x40 + ((cksum >> 12) & 0x3f)
172 CSUM2: 0x40 + ((cksum >> 6) & 0x3f)
173 CSUM3: 0x40 + (cksum & 0x3f)
175 It happens that the MIPS remote debugging protocol always
176 communicates with ASCII strings. Because of this, this
177 implementation doesn't bother to handle the DLE quoting mechanism,
178 since it will never be required. */
180 /* The SYN character which starts each packet. */
183 /* The 0x40 used to offset each packet (this value ensures that all of
184 the header and trailer bytes, other than SYN, are printable ASCII
186 #define HDR_OFFSET 0x40
188 /* The indices of the bytes in the packet header. */
189 #define HDR_INDX_SYN 0
190 #define HDR_INDX_TYPE_LEN 1
191 #define HDR_INDX_LEN1 2
192 #define HDR_INDX_SEQ 3
195 /* The data/ack bit in the TYPE_LEN header byte. */
196 #define TYPE_LEN_DA_BIT 0x20
197 #define TYPE_LEN_DATA 0
198 #define TYPE_LEN_ACK TYPE_LEN_DA_BIT
200 /* How to compute the header bytes. */
201 #define HDR_SET_SYN(data, len, seq) (SYN)
202 #define HDR_SET_TYPE_LEN(data, len, seq) \
204 + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \
205 + (((len) >> 6) & 0x1f))
206 #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f))
207 #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq))
209 /* Check that a header byte is reasonable. */
210 #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET)
212 /* Get data from the header. These macros evaluate their argument
214 #define HDR_IS_DATA(hdr) \
215 (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA)
216 #define HDR_GET_LEN(hdr) \
217 ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f)))
218 #define HDR_GET_SEQ(hdr) ((hdr)[HDR_INDX_SEQ] & 0x3f)
220 /* The maximum data length. */
221 #define DATA_MAXLEN 1023
223 /* The trailer offset. */
224 #define TRLR_OFFSET HDR_OFFSET
226 /* The indices of the bytes in the packet trailer. */
227 #define TRLR_INDX_CSUM1 0
228 #define TRLR_INDX_CSUM2 1
229 #define TRLR_INDX_CSUM3 2
230 #define TRLR_LENGTH 3
232 /* How to compute the trailer bytes. */
233 #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f))
234 #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f))
235 #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f))
237 /* Check that a trailer byte is reasonable. */
238 #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET)
240 /* Get data from the trailer. This evaluates its argument multiple
242 #define TRLR_GET_CKSUM(trlr) \
243 ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \
244 + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \
245 + ((trlr)[TRLR_INDX_CSUM3] & 0x3f))
247 /* The sequence number modulos. */
248 #define SEQ_MODULOS (64)
250 /* Set to 1 if the target is open. */
251 static int mips_is_open
;
253 /* Set to 1 while the connection is being initialized. */
254 static int mips_initializing
;
256 /* The next sequence number to send. */
257 static int mips_send_seq
;
259 /* The next sequence number we expect to receive. */
260 static int mips_receive_seq
;
262 /* The time to wait before retransmitting a packet, in seconds. */
263 static int mips_retransmit_wait
= 3;
265 /* The number of times to try retransmitting a packet before giving up. */
266 static int mips_send_retries
= 10;
268 /* The number of garbage characters to accept when looking for an
269 SYN for the next packet. */
270 static int mips_syn_garbage
= 1050;
272 /* The time to wait for a packet, in seconds. */
273 static int mips_receive_wait
= 5;
275 /* Set if we have sent a packet to the board but have not yet received
277 static int mips_need_reply
= 0;
279 /* Handle used to access serial I/O stream. */
280 static serial_t mips_desc
;
282 /* Read a character from the remote, aborting on error. Returns
283 SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR
284 returns). FIXME: If we see the string "<IDT>" from the board, then
285 we are debugging on the main console port, and we have somehow
286 dropped out of remote debugging mode. In this case, we
287 automatically go back in to remote debugging mode. This is a hack,
288 put in because I can't find any way for a program running on the
289 remote board to terminate without also ending remote debugging
290 mode. I assume users won't have any trouble with this; for one
291 thing, the IDT documentation generally assumes that the remote
292 debugging port is not the console port. This is, however, very
293 convenient for DejaGnu when you only have one connected serial
297 mips_readchar (timeout
)
301 static int state
= 0;
302 static char nextstate
[5] = { '<', 'I', 'D', 'T', '>' };
304 ch
= SERIAL_READCHAR (mips_desc
, timeout
);
305 if (ch
== SERIAL_EOF
)
306 error ("End of file from remote");
307 if (ch
== SERIAL_ERROR
)
308 error ("Error reading from remote: %s", safe_strerror (errno
));
309 if (remote_debug
> 1)
311 if (ch
!= SERIAL_TIMEOUT
)
312 printf_filtered ("Read '%c' %d 0x%x\n", ch
, ch
, ch
);
314 printf_filtered ("Timed out in read\n");
317 /* If we have seen <IDT> and we either time out, or we see a @
318 (which was echoed from a packet we sent), reset the board as
319 described above. The first character in a packet after the SYN
320 (which is not echoed) is always an @ unless the packet is more
321 than 64 characters long, which ours never are. */
322 if ((ch
== SERIAL_TIMEOUT
|| ch
== '@')
324 && ! mips_initializing
)
326 if (remote_debug
> 0)
327 printf_filtered ("Reinitializing MIPS debugging mode\n");
328 SERIAL_WRITE (mips_desc
, "\rdb tty0\r", sizeof "\rdb tty0\r" - 1);
336 error ("Remote board reset");
339 if (ch
== nextstate
[state
])
347 /* Get a packet header, putting the data in the supplied buffer.
348 PGARBAGE is a pointer to the number of garbage characters received
349 so far. CH is the last character received. Returns 0 for success,
350 or -1 for timeout. */
353 mips_receive_header (hdr
, pgarbage
, ch
, timeout
)
363 /* Wait for a SYN. mips_syn_garbage is intended to prevent
364 sitting here indefinitely if the board sends us one garbage
365 character per second. ch may already have a value from the
366 last time through the loop. */
369 ch
= mips_readchar (timeout
);
370 if (ch
== SERIAL_TIMEOUT
)
374 /* Printing the character here lets the user of gdb see
375 what the program is outputting, if the debugging is
376 being done on the console port. FIXME: Perhaps this
377 should be filtered? */
378 if (! mips_initializing
|| remote_debug
> 0)
385 if (*pgarbage
> mips_syn_garbage
)
386 error ("Remote debugging protocol failure");
390 /* Get the packet header following the SYN. */
391 for (i
= 1; i
< HDR_LENGTH
; i
++)
393 ch
= mips_readchar (timeout
);
394 if (ch
== SERIAL_TIMEOUT
)
397 /* Make sure this is a header byte. */
398 if (ch
== SYN
|| ! HDR_CHECK (ch
))
404 /* If we got the complete header, we can return. Otherwise we
405 loop around and keep looking for SYN. */
411 /* Get a packet header, putting the data in the supplied buffer.
412 PGARBAGE is a pointer to the number of garbage characters received
413 so far. The last character read is returned in *PCH. Returns 0
414 for success, -1 for timeout, -2 for error. */
417 mips_receive_trailer (trlr
, pgarbage
, pch
, timeout
)
426 for (i
= 0; i
< TRLR_LENGTH
; i
++)
428 ch
= mips_readchar (timeout
);
430 if (ch
== SERIAL_TIMEOUT
)
432 if (! TRLR_CHECK (ch
))
439 /* Get the checksum of a packet. HDR points to the packet header.
440 DATA points to the packet data. LEN is the length of DATA. */
443 mips_cksum (hdr
, data
, len
)
444 const unsigned char *hdr
;
445 const unsigned char *data
;
448 register const unsigned char *p
;
454 /* The initial SYN is not included in the checksum. */
468 /* Send a packet containing the given ASCII string. */
471 mips_send_packet (s
, get_ack
)
476 unsigned char *packet
;
481 if (len
> DATA_MAXLEN
)
482 error ("MIPS protocol data packet too long: %s", s
);
484 packet
= (unsigned char *) alloca (HDR_LENGTH
+ len
+ TRLR_LENGTH
+ 1);
486 packet
[HDR_INDX_SYN
] = HDR_SET_SYN (1, len
, mips_send_seq
);
487 packet
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (1, len
, mips_send_seq
);
488 packet
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (1, len
, mips_send_seq
);
489 packet
[HDR_INDX_SEQ
] = HDR_SET_SEQ (1, len
, mips_send_seq
);
491 memcpy (packet
+ HDR_LENGTH
, s
, len
);
493 cksum
= mips_cksum (packet
, packet
+ HDR_LENGTH
, len
);
494 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
495 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
496 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
498 /* Increment the sequence number. This will set mips_send_seq to
499 the sequence number we expect in the acknowledgement. */
500 mips_send_seq
= (mips_send_seq
+ 1) % SEQ_MODULOS
;
505 /* We can only have one outstanding data packet, so we just wait for
506 the acknowledgement here. Keep retransmitting the packet until
507 we get one, or until we've tried too many times. */
508 for (try = 0; try < mips_send_retries
; try++)
513 if (remote_debug
> 0)
515 packet
[HDR_LENGTH
+ len
+ TRLR_LENGTH
] = '\0';
516 printf_filtered ("Writing \"%s\"\n", packet
+ 1);
519 if (SERIAL_WRITE (mips_desc
, packet
,
520 HDR_LENGTH
+ len
+ TRLR_LENGTH
) != 0)
521 error ("write to target failed: %s", safe_strerror (errno
));
527 unsigned char hdr
[HDR_LENGTH
+ 1];
528 unsigned char trlr
[TRLR_LENGTH
+ 1];
532 /* Get the packet header. If we time out, resend the data
534 err
= mips_receive_header (hdr
, &garbage
, ch
, mips_retransmit_wait
);
540 /* If we get a data packet, assume it is a duplicate and
541 ignore it. FIXME: If the acknowledgement is lost, this
542 data packet may be the packet the remote sends after the
544 if (HDR_IS_DATA (hdr
))
547 /* If the length is not 0, this is a garbled packet. */
548 if (HDR_GET_LEN (hdr
) != 0)
551 /* Get the packet trailer. */
552 err
= mips_receive_trailer (trlr
, &garbage
, &ch
,
553 mips_retransmit_wait
);
555 /* If we timed out, resend the data packet. */
559 /* If we got a bad character, reread the header. */
563 /* If the checksum does not match the trailer checksum, this
564 is a bad packet; ignore it. */
565 if (mips_cksum (hdr
, (unsigned char *) NULL
, 0)
566 != TRLR_GET_CKSUM (trlr
))
569 if (remote_debug
> 0)
571 hdr
[HDR_LENGTH
] = '\0';
572 trlr
[TRLR_LENGTH
] = '\0';
573 printf_filtered ("Got ack %d \"%s%s\"\n",
574 HDR_GET_SEQ (hdr
), hdr
+ 1, trlr
);
577 /* If this ack is for the current packet, we're done. */
578 seq
= HDR_GET_SEQ (hdr
);
579 if (seq
== mips_send_seq
)
582 /* If this ack is for the last packet, resend the current
584 if ((seq
+ 1) % SEQ_MODULOS
== mips_send_seq
)
587 /* Otherwise this is a bad ack; ignore it. Increment the
588 garbage count to ensure that we do not stay in this loop
594 error ("Remote did not acknowledge packet");
597 /* Receive and acknowledge a packet, returning the data in BUFF (which
598 should be DATA_MAXLEN + 1 bytes). The protocol documentation
599 implies that only the sender retransmits packets, so this code just
600 waits silently for a packet. It returns the length of the received
604 mips_receive_packet (buff
)
610 unsigned char ack
[HDR_LENGTH
+ TRLR_LENGTH
+ 1];
617 unsigned char hdr
[HDR_LENGTH
];
618 unsigned char trlr
[TRLR_LENGTH
];
622 if (mips_receive_header (hdr
, &garbage
, ch
, mips_receive_wait
) != 0)
623 error ("Timed out waiting for remote packet");
627 /* An acknowledgement is probably a duplicate; ignore it. */
628 if (! HDR_IS_DATA (hdr
))
630 if (remote_debug
> 0)
631 printf_filtered ("Ignoring unexpected ACK\n");
635 /* If this is the wrong sequence number, ignore it. */
636 if (HDR_GET_SEQ (hdr
) != mips_receive_seq
)
638 if (remote_debug
> 0)
639 printf_filtered ("Ignoring sequence number %d (want %d)\n",
640 HDR_GET_SEQ (hdr
), mips_receive_seq
);
644 len
= HDR_GET_LEN (hdr
);
646 for (i
= 0; i
< len
; i
++)
650 rch
= mips_readchar (mips_receive_wait
);
656 if (rch
== SERIAL_TIMEOUT
)
657 error ("Timed out waiting for remote packet");
663 if (remote_debug
> 0)
664 printf_filtered ("Got new SYN after %d chars (wanted %d)\n",
669 err
= mips_receive_trailer (trlr
, &garbage
, &ch
, mips_receive_wait
);
671 error ("Timed out waiting for packet");
674 if (remote_debug
> 0)
675 printf_filtered ("Got SYN when wanted trailer\n");
679 if (mips_cksum (hdr
, buff
, len
) == TRLR_GET_CKSUM (trlr
))
682 if (remote_debug
> 0)
683 printf_filtered ("Bad checksum; data %d, trailer %d\n",
684 mips_cksum (hdr
, buff
, len
),
685 TRLR_GET_CKSUM (trlr
));
687 /* The checksum failed. Send an acknowledgement for the
688 previous packet to tell the remote to resend the packet. */
689 ack
[HDR_INDX_SYN
] = HDR_SET_SYN (0, 0, mips_receive_seq
);
690 ack
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq
);
691 ack
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (0, 0, mips_receive_seq
);
692 ack
[HDR_INDX_SEQ
] = HDR_SET_SEQ (0, 0, mips_receive_seq
);
694 cksum
= mips_cksum (ack
, (unsigned char *) NULL
, 0);
696 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
697 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
698 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
700 if (remote_debug
> 0)
702 ack
[HDR_LENGTH
+ TRLR_LENGTH
] = '\0';
703 printf_filtered ("Writing ack %d \"%s\"\n", mips_receive_seq
,
707 if (SERIAL_WRITE (mips_desc
, ack
, HDR_LENGTH
+ TRLR_LENGTH
) != 0)
708 error ("write to target failed: %s", safe_strerror (errno
));
711 if (remote_debug
> 0)
714 printf_filtered ("Got packet \"%s\"\n", buff
);
717 /* We got the packet. Send an acknowledgement. */
718 mips_receive_seq
= (mips_receive_seq
+ 1) % SEQ_MODULOS
;
720 ack
[HDR_INDX_SYN
] = HDR_SET_SYN (0, 0, mips_receive_seq
);
721 ack
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq
);
722 ack
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (0, 0, mips_receive_seq
);
723 ack
[HDR_INDX_SEQ
] = HDR_SET_SEQ (0, 0, mips_receive_seq
);
725 cksum
= mips_cksum (ack
, (unsigned char *) NULL
, 0);
727 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
728 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
729 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
731 if (remote_debug
> 0)
733 ack
[HDR_LENGTH
+ TRLR_LENGTH
] = '\0';
734 printf_filtered ("Writing ack %d \"%s\"\n", mips_receive_seq
,
738 if (SERIAL_WRITE (mips_desc
, ack
, HDR_LENGTH
+ TRLR_LENGTH
) != 0)
739 error ("write to target failed: %s", safe_strerror (errno
));
744 /* Optionally send a request to the remote system and optionally wait
745 for the reply. This implements the remote debugging protocol,
746 which is built on top of the packet protocol defined above. Each
747 request has an ADDR argument and a DATA argument. The following
748 requests are defined:
750 \0 don't send a request; just wait for a reply
751 i read word from instruction space at ADDR
752 d read word from data space at ADDR
753 I write DATA to instruction space at ADDR
754 D write DATA to data space at ADDR
755 r read register number ADDR
756 R set register number ADDR to value DATA
757 c continue execution (if ADDR != 1, set pc to ADDR)
758 s single step (if ADDR != 1, set pc to ADDR)
760 The read requests return the value requested. The write requests
761 return the previous value in the changed location. The execution
762 requests return a UNIX wait value (the approximate signal which
763 caused execution to stop is in the upper eight bits).
765 If PERR is not NULL, this function waits for a reply. If an error
766 occurs, it sets *PERR to 1 and sets errno according to what the
767 target board reports. */
770 mips_request (cmd
, addr
, data
, perr
)
776 char buff
[DATA_MAXLEN
+ 1];
786 fatal ("mips_request: Trying to send command before reply");
787 sprintf (buff
, "0x0 %c 0x%x 0x%x", cmd
, addr
, data
);
788 mips_send_packet (buff
, 1);
792 if (perr
== (int *) NULL
)
795 if (! mips_need_reply
)
796 fatal ("mips_request: Trying to get reply before command");
800 len
= mips_receive_packet (buff
);
803 if (sscanf (buff
, "0x%x %c 0x%x 0x%x",
804 &rpid
, &rcmd
, &rerrflg
, &rresponse
) != 4
805 || (cmd
!= '\0' && rcmd
!= cmd
))
806 error ("Bad response from remote board");
812 /* FIXME: This will returns MIPS errno numbers, which may or may
813 not be the same as errno values used on other systems. If
814 they stick to common errno values, they will be the same, but
815 if they don't, they must be translated. */
825 /* Initialize a new connection to the MIPS board, and make sure we are
834 char buff
[DATA_MAXLEN
+ 1];
837 if (mips_initializing
)
840 mips_initializing
= 1;
843 mips_receive_seq
= 0;
845 /* The board seems to want to send us a packet. I don't know what
846 it means. The packet seems to be triggered by a carriage return
847 character, although perhaps any character would do. */
849 SERIAL_WRITE (mips_desc
, &cr
, 1);
851 hold_wait
= mips_receive_wait
;
852 mips_receive_wait
= 3;
855 while (catch_errors (mips_receive_packet
, buff
, (char *) NULL
,
862 error ("Could not connect to target");
865 /* We did not receive the packet we expected; try resetting the
866 board and trying again. */
867 printf_filtered ("Failed to initialize; trying to reset board\n");
869 SERIAL_WRITE (mips_desc
, &cc
, 1);
871 SERIAL_WRITE (mips_desc
, "\rdb tty0\r", sizeof "\rdb tty0\r" - 1);
874 SERIAL_WRITE (mips_desc
, &cr
, 1);
877 mips_receive_wait
= hold_wait
;
878 mips_initializing
= 0;
880 /* If this doesn't call error, we have connected; we don't care if
881 the request itself succeeds or fails. */
882 mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err
);
885 /* Open a connection to the remote board. */
888 mips_open (name
, from_tty
)
894 "To open a MIPS remote debugging connection, you need to specify what serial\n\
895 device is attached to the target board (e.g., /dev/ttya).");
897 target_preopen (from_tty
);
900 unpush_target (&mips_ops
);
902 mips_desc
= SERIAL_OPEN (name
);
903 if (mips_desc
== (serial_t
) NULL
)
904 perror_with_name (name
);
906 SERIAL_RAW (mips_desc
);
913 printf ("Remote MIPS debugging using %s\n", name
);
914 push_target (&mips_ops
); /* Switch to using remote target now */
916 /* FIXME: Should we call start_remote here? */
919 /* Close a connection to the remote board. */
922 mips_close (quitting
)
931 /* Get the board out of remote debugging mode. */
932 mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err
);
934 SERIAL_CLOSE (mips_desc
);
938 /* Detach from the remote board. */
941 mips_detach (args
, from_tty
)
946 error ("Argument given to \"detach\" when remotely debugging.");
950 printf ("Ending remote MIPS debugging.\n");
953 /* Tell the target board to resume. This does not wait for a reply
957 mips_resume (pid
, step
, siggnal
)
958 int pid
, step
, siggnal
;
961 error ("Can't send signals to a remote system. Try `handle %d ignore'.",
964 mips_request (step
? 's' : 'c',
970 /* Wait until the remote stops, and return a wait status. */
979 /* If we have not sent a single step or continue command, then the
980 board is waiting for us to do something. Return a status
981 indicating that it is stopped. */
982 if (! mips_need_reply
)
984 WSETSTOP (*status
, SIGTRAP
);
988 rstatus
= mips_request ('\0', (unsigned int) 0, (unsigned int) 0, &err
);
990 error ("Remote failure: %s", safe_strerror (errno
));
992 /* FIXME: The target board uses numeric signal values which are
993 those used on MIPS systems. If the host uses different signal
994 values, we need to translate here. I believe all Unix systems
995 use the same values for the signals the board can return, which
996 are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */
998 /* FIXME: The target board uses a standard Unix wait status int. If
999 the host system does not, we must translate here. */
1006 /* We have to map between the register numbers used by gdb and the
1007 register numbers used by the debugging protocol. This function
1008 assumes that we are using tm-mips.h. */
1010 #define REGNO_OFFSET 96
1013 mips_map_regno (regno
)
1018 if (regno
>= FP0_REGNUM
&& regno
< FP0_REGNUM
+ 32)
1019 return regno
- FP0_REGNUM
+ 32;
1023 return REGNO_OFFSET
+ 0;
1025 return REGNO_OFFSET
+ 1;
1027 return REGNO_OFFSET
+ 2;
1029 return REGNO_OFFSET
+ 3;
1031 return REGNO_OFFSET
+ 4;
1033 return REGNO_OFFSET
+ 5;
1035 /* FIXME: Is there a way to get the status register? */
1040 /* Fetch the remote registers. */
1043 mips_fetch_registers (regno
)
1051 for (regno
= 0; regno
< NUM_REGS
; regno
++)
1052 mips_fetch_registers (regno
);
1056 val
= mips_request ('r', (unsigned int) mips_map_regno (regno
),
1057 (unsigned int) 0, &err
);
1059 error ("Can't read register %d: %s", regno
, safe_strerror (errno
));
1062 char buf
[MAX_REGISTER_RAW_SIZE
];
1064 /* We got the number the register holds, but gdb expects to see a
1065 value in the target byte ordering. */
1066 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (regno
), val
);
1067 supply_register (regno
, buf
);
1071 /* Prepare to store registers. The MIPS protocol can store individual
1072 registers, so this function doesn't have to do anything. */
1075 mips_prepare_to_store ()
1079 /* Store remote register(s). */
1082 mips_store_registers (regno
)
1089 for (regno
= 0; regno
< NUM_REGS
; regno
++)
1090 mips_store_registers (regno
);
1094 mips_request ('R', (unsigned int) mips_map_regno (regno
),
1095 (unsigned int) read_register (regno
),
1098 error ("Can't write register %d: %s", regno
, safe_strerror (errno
));
1101 /* Fetch a word from the target board. */
1104 mips_fetch_word (addr
)
1110 val
= mips_request ('d', (unsigned int) addr
, (unsigned int) 0, &err
);
1113 /* Data space failed; try instruction space. */
1114 val
= mips_request ('i', (unsigned int) addr
, (unsigned int) 0, &err
);
1116 error ("Can't read address 0x%x: %s", addr
, safe_strerror (errno
));
1121 /* Store a word to the target board. */
1124 mips_store_word (addr
, val
)
1130 mips_request ('D', (unsigned int) addr
, (unsigned int) val
, &err
);
1133 /* Data space failed; try instruction space. */
1134 mips_request ('I', (unsigned int) addr
, (unsigned int) val
, &err
);
1136 error ("Can't write address 0x%x: %s", addr
, safe_strerror (errno
));
1140 /* Read or write LEN bytes from inferior memory at MEMADDR,
1141 transferring to or from debugger address MYADDR. Write to inferior
1142 if SHOULD_WRITE is nonzero. Returns length of data written or
1143 read; 0 for error. Note that protocol gives us the correct value
1144 for a longword, since it transfers values in ASCII. We want the
1145 byte values, so we have to swap the longword values. */
1148 mips_xfer_memory (memaddr
, myaddr
, len
, write
, ignore
)
1153 struct target_ops
*ignore
;
1156 /* Round starting address down to longword boundary. */
1157 register CORE_ADDR addr
= memaddr
&~ 3;
1158 /* Round ending address up; get number of longwords that makes. */
1159 register int count
= (((memaddr
+ len
) - addr
) + 3) / 4;
1160 /* Allocate buffer of that many longwords. */
1161 register char *buffer
= alloca (count
* 4);
1165 /* Fill start and end extra bytes of buffer with existing data. */
1166 if (addr
!= memaddr
|| len
< 4)
1168 /* Need part of initial word -- fetch it. */
1169 store_unsigned_integer (&buffer
[0], 4, mips_fetch_word (addr
));
1174 /* Need part of last word -- fetch it. FIXME: we do this even
1175 if we don't need it. */
1176 store_unsigned_integer (&buffer
[(count
- 1) * 4], 4,
1177 mips_fetch_word (addr
+ (count
- 1) * 4));
1180 /* Copy data to be written over corresponding part of buffer */
1182 memcpy ((char *) buffer
+ (memaddr
& 3), myaddr
, len
);
1184 /* Write the entire buffer. */
1186 for (i
= 0; i
< count
; i
++, addr
+= 4)
1188 mips_store_word (addr
, extract_unsigned_integer (&buffer
[i
*4], 4));
1189 /* FIXME: Do we want a QUIT here? */
1194 /* Read all the longwords */
1195 for (i
= 0; i
< count
; i
++, addr
+= 4)
1197 store_unsigned_integer (&buffer
[i
*4], 4, mips_fetch_word (addr
));
1201 /* Copy appropriate bytes out of the buffer. */
1202 memcpy (myaddr
, buffer
+ (memaddr
& 3), len
);
1207 /* Print info on this target. */
1210 mips_files_info (ignore
)
1211 struct target_ops
*ignore
;
1213 printf ("Debugging a MIPS board over a serial line.\n");
1216 /* Kill the process running on the board. This will actually only
1217 work if we are doing remote debugging over the console input. I
1218 think that if IDT/sim had the remote debug interrupt enabled on the
1219 right port, we could interrupt the process with a break signal. */
1231 SERIAL_WRITE (mips_desc
, &cc
, 1);
1233 target_mourn_inferior ();
1238 /* Start running on the target board. */
1241 mips_create_inferior (execfile
, args
, env
)
1249 error ("Can't pass arguments to remote MIPS board.");
1251 if (execfile
== 0 || exec_bfd
== 0)
1252 error ("No exec file specified");
1254 entry_pt
= (CORE_ADDR
) bfd_get_start_address (exec_bfd
);
1256 init_wait_for_inferior ();
1258 /* FIXME: Should we set inferior_pid here? */
1260 proceed (entry_pt
, -1, 0);
1263 /* Clean up after a process. Actually nothing to do. */
1266 mips_mourn_inferior ()
1268 unpush_target (&mips_ops
);
1269 generic_mourn_inferior ();
1272 /* The target vector. */
1274 struct target_ops mips_ops
=
1276 "mips", /* to_shortname */
1277 "Remote MIPS debugging over serial line", /* to_longname */
1278 "Debug a board using the MIPS remote debugging protocol over a serial line.\n\
1279 Specify the serial device it is connected to (e.g., /dev/ttya).", /* to_doc */
1280 mips_open
, /* to_open */
1281 mips_close
, /* to_close */
1282 NULL
, /* to_attach */
1283 mips_detach
, /* to_detach */
1284 mips_resume
, /* to_resume */
1285 mips_wait
, /* to_wait */
1286 mips_fetch_registers
, /* to_fetch_registers */
1287 mips_store_registers
, /* to_store_registers */
1288 mips_prepare_to_store
, /* to_prepare_to_store */
1289 mips_xfer_memory
, /* to_xfer_memory */
1290 mips_files_info
, /* to_files_info */
1291 NULL
, /* to_insert_breakpoint */
1292 NULL
, /* to_remove_breakpoint */
1293 NULL
, /* to_terminal_init */
1294 NULL
, /* to_terminal_inferior */
1295 NULL
, /* to_terminal_ours_for_output */
1296 NULL
, /* to_terminal_ours */
1297 NULL
, /* to_terminal_info */
1298 mips_kill
, /* to_kill */
1299 generic_load
, /* to_load */
1300 NULL
, /* to_lookup_symbol */
1301 mips_create_inferior
, /* to_create_inferior */
1302 mips_mourn_inferior
, /* to_mourn_inferior */
1303 NULL
, /* to_can_run */
1304 NULL
, /* to_notice_signals */
1305 process_stratum
, /* to_stratum */
1307 1, /* to_has_all_memory */
1308 1, /* to_has_memory */
1309 1, /* to_has_stack */
1310 1, /* to_has_registers */
1311 1, /* to_has_execution */
1312 NULL
, /* sections */
1313 NULL
, /* sections_end */
1314 OPS_MAGIC
/* to_magic */
1318 _initialize_remote_mips ()
1320 add_target (&mips_ops
);
1323 add_set_cmd ("timeout", no_class
, var_zinteger
,
1324 (char *) &mips_receive_wait
,
1325 "Set timeout in seconds for remote MIPS serial I/O.",
1330 add_set_cmd ("retransmit-timeout", no_class
, var_zinteger
,
1331 (char *) &mips_retransmit_wait
,
1332 "Set retransmit timeout in seconds for remote MIPS serial I/O.\n\
1333 This is the number of seconds to wait for an acknowledgement to a packet\n\
1334 before resending the packet.", &setlist
),
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