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. */
33 /* Prototypes for local functions. */
36 mips_readchar
PARAMS ((int timeout
));
39 mips_receive_header
PARAMS ((unsigned char *hdr
, int *pgarbage
, int ch
,
43 mips_receive_trailer
PARAMS ((unsigned char *trlr
, int *pgarbage
, int *pch
,
46 static int mips_cksum
PARAMS ((const unsigned char *hdr
,
47 const unsigned char *data
,
51 mips_send_packet
PARAMS ((const char *s
, int get_ack
));
54 mips_receive_packet
PARAMS ((char *buff
));
57 mips_request
PARAMS ((char cmd
, unsigned int addr
, unsigned int data
,
61 mips_initialize
PARAMS ((void));
64 mips_open
PARAMS ((char *name
, int from_tty
));
67 mips_close
PARAMS ((int quitting
));
70 mips_detach
PARAMS ((char *args
, int from_tty
));
73 mips_resume
PARAMS ((int step
, int siggnal
));
76 mips_wait
PARAMS ((WAITTYPE
*status
));
79 mips_map_regno
PARAMS ((int regno
));
82 mips_fetch_registers
PARAMS ((int regno
));
85 mips_prepare_to_store
PARAMS ((void));
88 mips_store_registers
PARAMS ((int regno
));
91 mips_fetch_word
PARAMS ((CORE_ADDR addr
));
94 mips_store_word
PARAMS ((CORE_ADDR addr
, int value
));
97 mips_xfer_memory
PARAMS ((CORE_ADDR memaddr
, char *myaddr
, int len
,
98 int write
, struct target_ops
*ignore
));
101 mips_files_info
PARAMS ((struct target_ops
*ignore
));
104 mips_load
PARAMS ((char *args
, int from_tty
));
107 mips_create_inferior
PARAMS ((char *execfile
, char *args
, char **env
));
110 mips_mourn_inferior
PARAMS ((void));
112 /* A forward declaration. */
113 extern struct target_ops mips_ops
;
115 /* The MIPS remote debugging interface is built on top of a simple
116 packet protocol. Each packet is organized as follows:
118 SYN The first character is always a SYN (ASCII 026, or ^V). SYN
119 may not appear anywhere else in the packet. Any time a SYN is
120 seen, a new packet should be assumed to have begun.
123 This byte contains the upper five bits of the logical length
124 of the data section, plus a single bit indicating whether this
125 is a data packet or an acknowledgement. The documentation
126 indicates that this bit is 1 for a data packet, but the actual
127 board uses 1 for an acknowledgement. The value of the byte is
128 0x40 + (ack ? 0x20 : 0) + (len >> 6)
129 (we always have 0 <= len < 1024). Acknowledgement packets do
130 not carry data, and must have a data length of 0.
132 LEN1 This byte contains the lower six bits of the logical length of
133 the data section. The value is
136 SEQ This byte contains the six bit sequence number of the packet.
139 An acknowlegment packet contains the sequence number of the
140 packet being acknowledged plus 1 module 64. Data packets are
141 transmitted in sequence. There may only be one outstanding
142 unacknowledged data packet at a time. The sequence numbers
143 are independent in each direction. If an acknowledgement for
144 the previous packet is received (i.e., an acknowledgement with
145 the sequence number of the packet just sent) the packet just
146 sent should be retransmitted. If no acknowledgement is
147 received within a timeout period, the packet should be
148 retransmitted. This has an unfortunate failure condition on a
149 high-latency line, as a delayed acknowledgement may lead to an
150 endless series of duplicate packets.
152 DATA The actual data bytes follow. The following characters are
153 escaped inline with DLE (ASCII 020, or ^P):
159 The additional DLE characters are not counted in the logical
160 length stored in the TYPE_LEN and LEN1 bytes.
165 These bytes contain an 18 bit checksum of the complete
166 contents of the packet excluding the SEQ byte and the
167 CSUM[123] bytes. The checksum is simply the twos complement
168 addition of all the bytes treated as unsigned characters. The
169 values of the checksum bytes are:
170 CSUM1: 0x40 + ((cksum >> 12) & 0x3f)
171 CSUM2: 0x40 + ((cksum >> 6) & 0x3f)
172 CSUM3: 0x40 + (cksum & 0x3f)
174 It happens that the MIPS remote debugging protocol always
175 communicates with ASCII strings. Because of this, this
176 implementation doesn't bother to handle the DLE quoting mechanism,
177 since it will never be required. */
179 /* The SYN character which starts each packet. */
182 /* The 0x40 used to offset each packet (this value ensures that all of
183 the header and trailer bytes, other than SYN, are printable ASCII
185 #define HDR_OFFSET 0x40
187 /* The indices of the bytes in the packet header. */
188 #define HDR_INDX_SYN 0
189 #define HDR_INDX_TYPE_LEN 1
190 #define HDR_INDX_LEN1 2
191 #define HDR_INDX_SEQ 3
194 /* The data/ack bit in the TYPE_LEN header byte. */
195 #define TYPE_LEN_DA_BIT 0x20
196 #define TYPE_LEN_DATA 0
197 #define TYPE_LEN_ACK TYPE_LEN_DA_BIT
199 /* How to compute the header bytes. */
200 #define HDR_SET_SYN(data, len, seq) (SYN)
201 #define HDR_SET_TYPE_LEN(data, len, seq) \
203 + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \
204 + (((len) >> 6) & 0x1f))
205 #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f))
206 #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq))
208 /* Check that a header byte is reasonable. */
209 #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET)
211 /* Get data from the header. These macros evaluate their argument
213 #define HDR_IS_DATA(hdr) \
214 (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA)
215 #define HDR_GET_LEN(hdr) \
216 ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f)))
217 #define HDR_GET_SEQ(hdr) ((hdr)[HDR_INDX_SEQ] & 0x3f)
219 /* The maximum data length. */
220 #define DATA_MAXLEN 1023
222 /* The trailer offset. */
223 #define TRLR_OFFSET HDR_OFFSET
225 /* The indices of the bytes in the packet trailer. */
226 #define TRLR_INDX_CSUM1 0
227 #define TRLR_INDX_CSUM2 1
228 #define TRLR_INDX_CSUM3 2
229 #define TRLR_LENGTH 3
231 /* How to compute the trailer bytes. */
232 #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f))
233 #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f))
234 #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f))
236 /* Check that a trailer byte is reasonable. */
237 #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET)
239 /* Get data from the trailer. This evaluates its argument multiple
241 #define TRLR_GET_CKSUM(trlr) \
242 ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \
243 + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \
244 + ((trlr)[TRLR_INDX_CSUM3] & 0x3f))
246 /* The sequence number modulos. */
247 #define SEQ_MODULOS (64)
249 /* Set to 1 if the target is open. */
250 static int mips_is_open
;
252 /* Set to 1 while the connection is being initialized. */
253 static int mips_initializing
;
255 /* The next sequence number to send. */
256 static int mips_send_seq
;
258 /* The next sequence number we expect to receive. */
259 static int mips_receive_seq
;
261 /* The time to wait before retransmitting a packet, in seconds. */
262 static int mips_retransmit_wait
= 3;
264 /* The number of times to try retransmitting a packet before giving up. */
265 static int mips_send_retries
= 10;
267 /* The number of garbage characters to accept when looking for an
268 SYN for the next packet. */
269 static int mips_syn_garbage
= 1050;
271 /* The time to wait for a packet, in seconds. */
272 static int mips_receive_wait
= 5;
274 /* Set if we have sent a packet to the board but have not yet received
276 static int mips_need_reply
= 0;
278 /* This can be set to get debugging with ``set remotedebug''. */
279 static int mips_debug
= 0;
281 /* Read a character from the remote, aborting on error. Returns -2 on
282 timeout (since that's what serial_readchar returns). FIXME: If we
283 see the string "<IDT>" from the board, then we are debugging on the
284 main console port, and we have somehow dropped out of remote
285 debugging mode. In this case, we automatically go back in to
286 remote debugging mode. This is a hack, put in because I can't find
287 any way for a program running on the remote board to terminate
288 without also ending remote debugging mode. I assume users won't
289 have any trouble with this; for one thing, the IDT documentation
290 generally assumes that the remote debugging port is not the console
291 port. This is, however, very convenient for DejaGnu when you only
292 have one connected serial port. */
295 mips_readchar (timeout
)
299 static int state
= 0;
300 static char nextstate
[5] = { '<', 'I', 'D', 'T', '>' };
302 ch
= serial_readchar (timeout
);
304 error ("End of file from remote");
306 error ("Error reading from remote: %s", safe_strerror (errno
));
310 printf_filtered ("Read '%c' %d 0x%x\n", ch
, ch
, ch
);
312 printf_filtered ("Timed out in read\n");
315 /* If we have seen <IDT> and we either time out, or we see a @
316 (which was echoed from a packet we sent), reset the board as
317 described above. The first character in a packet after the SYN
318 (which is not echoed) is always an @ unless the packet is more
319 than 64 characters long, which ours never are. */
320 if ((ch
== -2 || ch
== '@')
322 && ! mips_initializing
)
325 printf_filtered ("Reinitializing MIPS debugging mode\n");
326 serial_write ("\rdb tty0\r", sizeof "\rdb tty0\r" - 1);
334 error ("Remote board reset");
337 if (ch
== nextstate
[state
])
345 /* Get a packet header, putting the data in the supplied buffer.
346 PGARBAGE is a pointer to the number of garbage characters received
347 so far. CH is the last character received. Returns 0 for success,
348 or -1 for timeout. */
351 mips_receive_header (hdr
, pgarbage
, ch
, timeout
)
361 /* Wait for a SYN. mips_syn_garbage is intended to prevent
362 sitting here indefinitely if the board sends us one garbage
363 character per second. ch may already have a value from the
364 last time through the loop. */
367 ch
= mips_readchar (timeout
);
372 /* Printing the character here lets the user of gdb see
373 what the program is outputting, if the debugging is
374 being done on the console port. FIXME: Perhaps this
375 should be filtered? */
376 if (! mips_initializing
|| mips_debug
> 0)
383 if (*pgarbage
> mips_syn_garbage
)
384 error ("Remote debugging protocol failure");
388 /* Get the packet header following the SYN. */
389 for (i
= 1; i
< HDR_LENGTH
; i
++)
391 ch
= mips_readchar (timeout
);
395 /* Make sure this is a header byte. */
396 if (ch
== SYN
|| ! HDR_CHECK (ch
))
402 /* If we got the complete header, we can return. Otherwise we
403 loop around and keep looking for SYN. */
409 /* Get a packet header, putting the data in the supplied buffer.
410 PGARBAGE is a pointer to the number of garbage characters received
411 so far. The last character read is returned in *PCH. Returns 0
412 for success, -1 for timeout, -2 for error. */
415 mips_receive_trailer (trlr
, pgarbage
, pch
, timeout
)
424 for (i
= 0; i
< TRLR_LENGTH
; i
++)
426 ch
= mips_readchar (timeout
);
430 if (! TRLR_CHECK (ch
))
437 /* Get the checksum of a packet. HDR points to the packet header.
438 DATA points to the packet data. LEN is the length of DATA. */
441 mips_cksum (hdr
, data
, len
)
442 const unsigned char *hdr
;
443 const unsigned char *data
;
446 register const unsigned char *p
;
452 /* The initial SYN is not included in the checksum. */
466 /* Send a packet containing the given ASCII string. */
469 mips_send_packet (s
, get_ack
)
474 unsigned char *packet
;
479 if (len
> DATA_MAXLEN
)
480 error ("MIPS protocol data packet too long: %s", s
);
482 packet
= (unsigned char *) alloca (HDR_LENGTH
+ len
+ TRLR_LENGTH
+ 1);
484 packet
[HDR_INDX_SYN
] = HDR_SET_SYN (1, len
, mips_send_seq
);
485 packet
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (1, len
, mips_send_seq
);
486 packet
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (1, len
, mips_send_seq
);
487 packet
[HDR_INDX_SEQ
] = HDR_SET_SEQ (1, len
, mips_send_seq
);
489 memcpy (packet
+ HDR_LENGTH
, s
, len
);
491 cksum
= mips_cksum (packet
, packet
+ HDR_LENGTH
, len
);
492 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
493 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
494 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
496 /* Increment the sequence number. This will set mips_send_seq to
497 the sequence number we expect in the acknowledgement. */
498 mips_send_seq
= (mips_send_seq
+ 1) % SEQ_MODULOS
;
503 /* We can only have one outstanding data packet, so we just wait for
504 the acknowledgement here. Keep retransmitting the packet until
505 we get one, or until we've tried too many times. */
506 for (try = 0; try < mips_send_retries
; try++)
513 packet
[HDR_LENGTH
+ len
+ TRLR_LENGTH
] = '\0';
514 printf_filtered ("Writing \"%s\"\n", packet
+ 1);
517 if (serial_write (packet
, HDR_LENGTH
+ len
+ TRLR_LENGTH
) == 0)
518 error ("write to target failed: %s", safe_strerror (errno
));
524 unsigned char hdr
[HDR_LENGTH
+ 1];
525 unsigned char trlr
[TRLR_LENGTH
+ 1];
529 /* Get the packet header. If we time out, resend the data
531 err
= mips_receive_header (hdr
, &garbage
, ch
, mips_retransmit_wait
);
537 /* If we get a data packet, assume it is a duplicate and
538 ignore it. FIXME: If the acknowledgement is lost, this
539 data packet may be the packet the remote sends after the
541 if (HDR_IS_DATA (hdr
))
544 /* If the length is not 0, this is a garbled packet. */
545 if (HDR_GET_LEN (hdr
) != 0)
548 /* Get the packet trailer. */
549 err
= mips_receive_trailer (trlr
, &garbage
, &ch
,
550 mips_retransmit_wait
);
552 /* If we timed out, resend the data packet. */
556 /* If we got a bad character, reread the header. */
560 /* If the checksum does not match the trailer checksum, this
561 is a bad packet; ignore it. */
562 if (mips_cksum (hdr
, (unsigned char *) NULL
, 0)
563 != TRLR_GET_CKSUM (trlr
))
568 hdr
[HDR_LENGTH
] = '\0';
569 trlr
[TRLR_LENGTH
] = '\0';
570 printf_filtered ("Got ack %d \"%s%s\"\n",
571 HDR_GET_SEQ (hdr
), hdr
, trlr
);
574 /* If this ack is for the current packet, we're done. */
575 seq
= HDR_GET_SEQ (hdr
);
576 if (seq
== mips_send_seq
)
579 /* If this ack is for the last packet, resend the current
581 if ((seq
+ 1) % SEQ_MODULOS
== mips_send_seq
)
584 /* Otherwise this is a bad ack; ignore it. Increment the
585 garbage count to ensure that we do not stay in this loop
591 error ("Remote did not acknowledge packet");
594 /* Receive and acknowledge a packet, returning the data in BUFF (which
595 should be DATA_MAXLEN + 1 bytes). The protocol documentation
596 implies that only the sender retransmits packets, so this code just
597 waits silently for a packet. It returns the length of the received
601 mips_receive_packet (buff
)
607 unsigned char ack
[HDR_LENGTH
+ TRLR_LENGTH
+ 1];
614 unsigned char hdr
[HDR_LENGTH
];
615 unsigned char trlr
[TRLR_LENGTH
];
619 if (mips_receive_header (hdr
, &garbage
, ch
, mips_receive_wait
) != 0)
620 error ("Timed out waiting for remote packet");
624 /* An acknowledgement is probably a duplicate; ignore it. */
625 if (! HDR_IS_DATA (hdr
))
628 printf_filtered ("Ignoring unexpected ACK\n");
632 /* If this is the wrong sequence number, ignore it. */
633 if (HDR_GET_SEQ (hdr
) != mips_receive_seq
)
636 printf_filtered ("Ignoring sequence number %d (want %d)\n",
637 HDR_GET_SEQ (hdr
), mips_receive_seq
);
641 len
= HDR_GET_LEN (hdr
);
643 for (i
= 0; i
< len
; i
++)
647 rch
= mips_readchar (mips_receive_wait
);
654 error ("Timed out waiting for remote packet");
661 printf_filtered ("Got new SYN after %d chars (wanted %d)\n",
666 err
= mips_receive_trailer (trlr
, &garbage
, &ch
, mips_receive_wait
);
668 error ("Timed out waiting for packet");
672 printf_filtered ("Got SYN when wanted trailer\n");
676 if (mips_cksum (hdr
, buff
, len
) == TRLR_GET_CKSUM (trlr
))
680 printf_filtered ("Bad checksum; data %d, trailer %d\n",
681 mips_cksum (hdr
, buff
, len
),
682 TRLR_GET_CKSUM (trlr
));
684 /* The checksum failed. Send an acknowledgement for the
685 previous packet to tell the remote to resend the packet. */
686 ack
[HDR_INDX_SYN
] = HDR_SET_SYN (0, 0, mips_receive_seq
);
687 ack
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq
);
688 ack
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (0, 0, mips_receive_seq
);
689 ack
[HDR_INDX_SEQ
] = HDR_SET_SEQ (0, 0, mips_receive_seq
);
691 cksum
= mips_cksum (ack
, (unsigned char *) NULL
, 0);
693 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
694 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
695 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
699 ack
[HDR_LENGTH
+ TRLR_LENGTH
] = '\0';
700 printf_filtered ("Writing ack %d \"%s\"\n", mips_receive_seq
,
704 if (serial_write (ack
, HDR_LENGTH
+ TRLR_LENGTH
) == 0)
705 error ("write to target failed: %s", safe_strerror (errno
));
711 printf_filtered ("Got packet \"%s\"\n", buff
);
714 /* We got the packet. Send an acknowledgement. */
715 mips_receive_seq
= (mips_receive_seq
+ 1) % SEQ_MODULOS
;
717 ack
[HDR_INDX_SYN
] = HDR_SET_SYN (0, 0, mips_receive_seq
);
718 ack
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq
);
719 ack
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (0, 0, mips_receive_seq
);
720 ack
[HDR_INDX_SEQ
] = HDR_SET_SEQ (0, 0, mips_receive_seq
);
722 cksum
= mips_cksum (ack
, (unsigned char *) NULL
, 0);
724 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
725 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
726 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
730 ack
[HDR_LENGTH
+ TRLR_LENGTH
] = '\0';
731 printf_filtered ("Writing ack %d \"%s\"\n", mips_receive_seq
,
735 if (serial_write (ack
, HDR_LENGTH
+ TRLR_LENGTH
) == 0)
736 error ("write to target failed: %s", safe_strerror (errno
));
741 /* Optionally send a request to the remote system and optionally wait
742 for the reply. This implements the remote debugging protocol,
743 which is built on top of the packet protocol defined above. Each
744 request has an ADDR argument and a DATA argument. The following
745 requests are defined:
747 \0 don't send a request; just wait for a reply
748 i read word from instruction space at ADDR
749 d read word from data space at ADDR
750 I write DATA to instruction space at ADDR
751 D write DATA to data space at ADDR
752 r read register number ADDR
753 R set register number ADDR to value DATA
754 c continue execution (if ADDR != 1, set pc to ADDR)
755 s single step (if ADDR != 1, set pc to ADDR)
757 The read requests return the value requested. The write requests
758 return the previous value in the changed location. The execution
759 requests return a UNIX wait value (the approximate signal which
760 caused execution to stop is in the upper eight bits).
762 If PERR is not NULL, this function waits for a reply. If an error
763 occurs, it sets *PERR to 1 and sets errno according to what the
764 target board reports. */
767 mips_request (cmd
, addr
, data
, perr
)
773 char buff
[DATA_MAXLEN
+ 1];
783 fatal ("mips_request: Trying to send command before reply");
784 sprintf (buff
, "0x0 %c 0x%x 0x%x", cmd
, addr
, data
);
785 mips_send_packet (buff
, 1);
789 if (perr
== (int *) NULL
)
792 if (! mips_need_reply
)
793 fatal ("mips_request: Trying to get reply before command");
797 len
= mips_receive_packet (buff
);
800 if (sscanf (buff
, "0x%x %c 0x%x 0x%x",
801 &rpid
, &rcmd
, &rerrflg
, &rresponse
) != 4
803 || (cmd
!= '\0' && rcmd
!= cmd
))
804 error ("Bad response from remote board");
810 /* FIXME: This will returns MIPS errno numbers, which may or may
811 not be the same as errno values used on other systems. If
812 they stick to common errno values, they will be the same, but
813 if they don't, they must be translated. */
823 /* Initialize a new connection to the MIPS board, and make sure we are
832 char buff
[DATA_MAXLEN
+ 1];
835 if (mips_initializing
)
838 mips_initializing
= 1;
841 mips_receive_seq
= 0;
843 /* The board seems to want to send us a packet. I don't know what
844 it means. The packet seems to be triggered by a carriage return
845 character, although perhaps any character would do. */
847 serial_write (&cr
, 1);
849 hold_wait
= mips_receive_wait
;
850 mips_receive_wait
= 3;
853 while (catch_errors (mips_receive_packet
, buff
, (char *) NULL
) == 0)
858 error ("Could not connect to target");
861 /* We did not receive the packet we expected; try resetting the
862 board and trying again. */
863 printf_filtered ("Failed to initialize; trying to reset board\n");
865 serial_write (&cc
, 1);
867 serial_write ("\rdb tty0\r", sizeof "\rdb tty0\r" - 1);
870 serial_write (&cr
, 1);
873 mips_receive_wait
= hold_wait
;
874 mips_initializing
= 0;
876 /* If this doesn't call error, we have connected; we don't care if
877 the request itself succeeds or fails. */
878 mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err
);
881 /* Open a connection to the remote board. */
884 mips_open (name
, from_tty
)
890 "To open a MIPS remote debugging connection, you need to specify what serial\n\
891 device is attached to the target board (e.g., /dev/ttya).");
893 target_preopen (from_tty
);
896 unpush_target (&mips_ops
);
898 if (serial_open (name
) == 0)
899 perror_with_name (name
);
906 printf ("Remote MIPS debugging using %s\n", name
);
907 push_target (&mips_ops
); /* Switch to using remote target now */
909 /* FIXME: Should we call start_remote here? */
912 /* Close a connection to the remote board. */
915 mips_close (quitting
)
924 /* Get the board out of remote debugging mode. */
925 mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err
);
931 /* Detach from the remote board. */
934 mips_detach (args
, from_tty
)
939 error ("Argument given to \"detach\" when remotely debugging.");
943 printf ("Ending remote MIPS debugging.\n");
946 /* Tell the target board to resume. This does not wait for a reply
950 mips_resume (step
, siggnal
)
954 error ("Can't send signals to a remote system. Try `handle %d ignore'.",
957 mips_request (step
? 's' : 'c',
963 /* Wait until the remote stops, and return a wait status. */
972 /* If we have not sent a single step or continue command, then the
973 board is waiting for us to do something. Return a status
974 indicating that it is stopped. */
975 if (! mips_need_reply
)
977 WSETSTOP (*status
, SIGTRAP
);
981 rstatus
= mips_request ('\0', (unsigned int) 0, (unsigned int) 0, &err
);
983 error ("Remote failure: %s", safe_strerror (errno
));
985 /* FIXME: The target board uses numeric signal values which are
986 those used on MIPS systems. If the host uses different signal
987 values, we need to translate here. I believe all Unix systems
988 use the same values for the signals the board can return, which
989 are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */
991 /* FIXME: The target board uses a standard Unix wait status int. If
992 the host system does not, we must translate here. */
999 /* We have to map between the register numbers used by gdb and the
1000 register numbers used by the debugging protocol. This function
1001 assumes that we are using tm-mips.h. */
1003 #define REGNO_OFFSET 96
1006 mips_map_regno (regno
)
1011 if (regno
>= FP0_REGNUM
&& regno
< FP0_REGNUM
+ 32)
1012 return regno
- FP0_REGNUM
+ 32;
1016 return REGNO_OFFSET
+ 0;
1018 return REGNO_OFFSET
+ 1;
1020 return REGNO_OFFSET
+ 2;
1022 return REGNO_OFFSET
+ 3;
1024 return REGNO_OFFSET
+ 4;
1026 return REGNO_OFFSET
+ 5;
1028 /* FIXME: Is there a way to get the status register? */
1033 /* Fetch the remote registers. */
1036 mips_fetch_registers (regno
)
1044 for (regno
= 0; regno
< NUM_REGS
; regno
++)
1045 mips_fetch_registers (regno
);
1049 val
= mips_request ('r', (unsigned int) mips_map_regno (regno
),
1050 (unsigned int) 0, &err
);
1052 error ("Can't read register %d: %s", regno
, safe_strerror (errno
));
1054 /* We got the number the register holds, but gdb expects to see a
1055 value in the target byte ordering. */
1056 SWAP_TARGET_AND_HOST (val
, sizeof (REGISTER_TYPE
));
1057 supply_register (regno
, (char *) &val
);
1060 /* Prepare to store registers. The MIPS protocol can store individual
1061 registers, so this function doesn't have to do anything. */
1064 mips_prepare_to_store ()
1068 /* Store remote register(s). */
1071 mips_store_registers (regno
)
1078 for (regno
= 0; regno
< NUM_REGS
; regno
++)
1079 mips_store_registers (regno
);
1083 mips_request ('R', (unsigned int) mips_map_regno (regno
),
1084 (unsigned int) read_register (regno
),
1087 error ("Can't write register %d: %s", regno
, safe_strerror (errno
));
1090 /* Fetch a word from the target board. */
1093 mips_fetch_word (addr
)
1099 val
= mips_request ('d', (unsigned int) addr
, (unsigned int) 0, &err
);
1102 /* Data space failed; try instruction space. */
1103 val
= mips_request ('i', (unsigned int) addr
, (unsigned int) 0, &err
);
1105 error ("Can't read address 0x%x: %s", addr
, safe_strerror (errno
));
1110 /* Store a word to the target board. */
1113 mips_store_word (addr
, val
)
1119 mips_request ('D', (unsigned int) addr
, (unsigned int) val
, &err
);
1122 /* Data space failed; try instruction space. */
1123 mips_request ('I', (unsigned int) addr
, (unsigned int) val
, &err
);
1125 error ("Can't write address 0x%x: %s", addr
, safe_strerror (errno
));
1129 /* Read or write LEN bytes from inferior memory at MEMADDR,
1130 transferring to or from debugger address MYADDR. Write to inferior
1131 if SHOULD_WRITE is nonzero. Returns length of data written or
1132 read; 0 for error. Note that protocol gives us the correct value
1133 for a longword, since it transfers values in ASCII. We want the
1134 byte values, so we have to swap the longword values. */
1137 mips_xfer_memory (memaddr
, myaddr
, len
, write
, ignore
)
1142 struct target_ops
*ignore
;
1145 /* Round starting address down to longword boundary. */
1146 register CORE_ADDR addr
= memaddr
&~ 3;
1147 /* Round ending address up; get number of longwords that makes. */
1148 register int count
= (((memaddr
+ len
) - addr
) + 3) / 4;
1149 /* Allocate buffer of that many longwords. */
1150 register unsigned int *buffer
= (unsigned int *) alloca (count
* 4);
1154 /* Fill start and end extra bytes of buffer with existing data. */
1155 if (addr
!= memaddr
|| len
< 4)
1157 /* Need part of initial word -- fetch it. */
1158 buffer
[0] = mips_fetch_word (addr
);
1159 SWAP_TARGET_AND_HOST (buffer
, 4);
1162 if (count
> 1) /* FIXME, avoid if even boundary */
1164 buffer
[count
- 1] = mips_fetch_word (addr
+ (count
- 1) * 4);
1165 SWAP_TARGET_AND_HOST (buffer
+ (count
- 1) * 4, 4);
1168 /* Copy data to be written over corresponding part of buffer */
1170 memcpy ((char *) buffer
+ (memaddr
& 3), myaddr
, len
);
1172 /* Write the entire buffer. */
1174 for (i
= 0; i
< count
; i
++, addr
+= 4)
1176 SWAP_TARGET_AND_HOST (buffer
+ i
, 4);
1177 mips_store_word (addr
, buffer
[i
]);
1182 /* Read all the longwords */
1183 for (i
= 0; i
< count
; i
++, addr
+= 4)
1185 buffer
[i
] = mips_fetch_word (addr
);
1186 SWAP_TARGET_AND_HOST (buffer
+ i
, 4);
1190 /* Copy appropriate bytes out of the buffer. */
1191 memcpy (myaddr
, (char *) buffer
+ (memaddr
& (sizeof (int) - 1)), len
);
1196 /* Print info on this target. */
1199 mips_files_info (ignore
)
1200 struct target_ops
*ignore
;
1202 printf ("Debugging a MIPS board over a serial line.\n");
1205 /* Kill the process running on the board. This will actually only
1206 work if we are doing remote debugging over the console input. I
1207 think that if IDT/sim had the remote debug interrupt enabled on the
1208 right port, we could interrupt the process with a break signal. */
1220 serial_write (&cc
, 1);
1222 target_mourn_inferior ();
1227 /* Load an executable onto the board. */
1230 mips_load (args
, from_tty
)
1239 abfd
= bfd_openr (args
, 0);
1240 if (abfd
== (bfd
*) NULL
)
1241 error ("Unable to open file %s", args
);
1243 if (bfd_check_format (abfd
, bfd_object
) == 0)
1244 error ("%s: Not an object file", args
);
1247 for (s
= abfd
->sections
; s
!= (asection
*) NULL
; s
= s
->next
)
1249 if ((s
->flags
& SEC_LOAD
) != 0)
1253 size
= bfd_get_section_size_before_reloc (s
);
1257 struct cleanup
*old_chain
;
1260 buffer
= xmalloc (size
);
1261 old_chain
= make_cleanup (free
, buffer
);
1263 vma
= bfd_get_section_vma (abfd
, s
);
1264 printf_filtered ("Loading section %s, size 0x%x vma 0x%x\n",
1265 bfd_get_section_name (abfd
, s
), size
, vma
);
1266 bfd_get_section_contents (abfd
, s
, buffer
, 0, size
);
1267 mips_xfer_memory (vma
, buffer
, size
, 1, &mips_ops
);
1269 do_cleanups (old_chain
);
1271 if ((bfd_get_section_flags (abfd
, s
) & SEC_CODE
) != 0
1278 mips_request ('R', (unsigned int) mips_map_regno (PC_REGNUM
),
1279 (unsigned int) abfd
->start_address
,
1282 error ("Can't write PC register: %s", safe_strerror (errno
));
1286 /* FIXME: Should we call symbol_file_add here? The local variable
1287 text exists just for this call. Making the call seems to confuse
1288 gdb if more than one file is loaded in. Perhaps passing MAINLINE
1289 as 1 would fix this, but it's not clear that that is correct
1290 either since it is possible to load several files onto the board.
1292 symbol_file_add (args, from_tty, text, 0, 0, 0); */
1295 /* Start running on the target board. */
1298 mips_create_inferior (execfile
, args
, env
)
1306 error ("Can't pass arguments to remote MIPS board.");
1308 if (execfile
== 0 || exec_bfd
== 0)
1309 error ("No exec file specified");
1311 entry_pt
= (CORE_ADDR
) bfd_get_start_address (exec_bfd
);
1313 init_wait_for_inferior ();
1315 /* FIXME: Should we set inferior_pid here? */
1317 proceed (entry_pt
, -1, 0);
1320 /* Clean up after a process. Actually nothing to do. */
1323 mips_mourn_inferior ()
1325 generic_mourn_inferior ();
1328 /* The target vector. */
1330 struct target_ops mips_ops
=
1332 "mips", /* to_shortname */
1333 "Remote MIPS debugging over serial line", /* to_longname */
1334 "Debug a board using the MIPS remote debugging protocol over a serial line.\n\
1335 Specify the serial device it is connected to (e.g., /dev/ttya).", /* to_doc */
1336 mips_open
, /* to_open */
1337 mips_close
, /* to_close */
1338 NULL
, /* to_attach */
1339 mips_detach
, /* to_detach */
1340 mips_resume
, /* to_resume */
1341 mips_wait
, /* to_wait */
1342 mips_fetch_registers
, /* to_fetch_registers */
1343 mips_store_registers
, /* to_store_registers */
1344 mips_prepare_to_store
, /* to_prepare_to_store */
1345 mips_xfer_memory
, /* to_xfer_memory */
1346 mips_files_info
, /* to_files_info */
1347 NULL
, /* to_insert_breakpoint */
1348 NULL
, /* to_remove_breakpoint */
1349 NULL
, /* to_terminal_init */
1350 NULL
, /* to_terminal_inferior */
1351 NULL
, /* to_terminal_ours_for_output */
1352 NULL
, /* to_terminal_ours */
1353 NULL
, /* to_terminal_info */
1354 mips_kill
, /* to_kill */
1355 mips_load
, /* to_load */
1356 NULL
, /* to_lookup_symbol */
1357 mips_create_inferior
, /* to_create_inferior */
1358 mips_mourn_inferior
, /* to_mourn_inferior */
1359 NULL
, /* to_can_run */
1360 NULL
, /* to_notice_signals */
1361 process_stratum
, /* to_stratum */
1363 1, /* to_has_all_memory */
1364 1, /* to_has_memory */
1365 1, /* to_has_stack */
1366 1, /* to_has_registers */
1367 1, /* to_has_execution */
1368 NULL
, /* sections */
1369 NULL
, /* sections_end */
1370 OPS_MAGIC
/* to_magic */
1374 _initialize_remote_mips ()
1376 add_target (&mips_ops
);
1379 add_set_cmd ("remotedebug", no_class
, var_zinteger
, (char *) &mips_debug
,
1380 "Set debugging of remote MIPS serial I/O.\n\
1381 When non-zero, each packet sent or received with the remote target\n\
1382 is displayed. Higher numbers produce more debugging.", &setlist
),
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