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
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
31 #include "remote-utils.h"
34 #ifdef ANSI_PROTOTYPES
40 extern void mips_set_processor_type_command
PARAMS ((char *, int));
43 /* Prototypes for local functions. */
45 static int mips_readchar
PARAMS ((int timeout
));
47 static int mips_receive_header
PARAMS ((unsigned char *hdr
, int *pgarbage
,
48 int ch
, int timeout
));
50 static int mips_receive_trailer
PARAMS ((unsigned char *trlr
, int *pgarbage
,
51 int *pch
, int timeout
));
53 static int mips_cksum
PARAMS ((const unsigned char *hdr
,
54 const unsigned char *data
,
57 static void mips_send_packet
PARAMS ((const char *s
, int get_ack
));
59 static void mips_send_command
PARAMS ((const char *cmd
, int prompt
));
61 static int mips_receive_packet
PARAMS ((char *buff
, int throw_error
,
64 static int mips_request
PARAMS ((int cmd
, unsigned int addr
,
65 unsigned int data
, int *perr
, int timeout
,
68 static void mips_initialize
PARAMS ((void));
70 static void mips_open
PARAMS ((char *name
, int from_tty
));
72 static void pmon_open
PARAMS ((char *name
, int from_tty
));
74 static void mips_close
PARAMS ((int quitting
));
76 static void mips_detach
PARAMS ((char *args
, int from_tty
));
78 static void mips_resume
PARAMS ((int pid
, int step
,
79 enum target_signal siggnal
));
81 static int mips_wait
PARAMS ((int pid
, struct target_waitstatus
*status
));
83 static int pmon_wait
PARAMS ((int pid
, struct target_waitstatus
*status
));
85 static int mips_map_regno
PARAMS ((int regno
));
87 static void mips_fetch_registers
PARAMS ((int regno
));
89 static void mips_prepare_to_store
PARAMS ((void));
91 static void mips_store_registers
PARAMS ((int regno
));
93 static int mips_fetch_word
PARAMS ((CORE_ADDR addr
));
95 static int mips_store_word
PARAMS ((CORE_ADDR addr
, int value
,
98 static int mips_xfer_memory
PARAMS ((CORE_ADDR memaddr
, char *myaddr
, int len
,
99 int write
, struct target_ops
*ignore
));
101 static void mips_files_info
PARAMS ((struct target_ops
*ignore
));
103 static void mips_create_inferior
PARAMS ((char *execfile
, char *args
,
106 static void mips_mourn_inferior
PARAMS ((void));
108 static int pmon_makeb64
PARAMS ((unsigned long v
, char *p
, int n
, int *chksum
));
110 static int pmon_zeroset
PARAMS ((int recsize
, char **buff
, int *amount
,
111 unsigned int *chksum
));
113 static int pmon_checkset
PARAMS ((int recsize
, char **buff
, int *value
));
115 static void pmon_make_fastrec
PARAMS ((char **outbuf
, unsigned char *inbuf
,
116 int *inptr
, int inamount
, int *recsize
,
117 unsigned int *csum
, unsigned int *zerofill
));
119 static int pmon_check_ack
PARAMS ((void));
121 static void pmon_load_fast
PARAMS ((char *file
));
123 static void mips_load
PARAMS ((char *file
, int from_tty
));
125 static int mips_make_srec
PARAMS ((char *buffer
, int type
, CORE_ADDR memaddr
,
126 unsigned char *myaddr
, int len
));
128 static int common_breakpoint
PARAMS ((int cmd
, CORE_ADDR addr
, CORE_ADDR mask
,
131 static void common_open
PARAMS ((struct target_ops
*ops
, char *name
,
133 /* Forward declarations. */
134 extern struct target_ops mips_ops
;
135 extern struct target_ops pmon_ops
;
137 /* The MIPS remote debugging interface is built on top of a simple
138 packet protocol. Each packet is organized as follows:
140 SYN The first character is always a SYN (ASCII 026, or ^V). SYN
141 may not appear anywhere else in the packet. Any time a SYN is
142 seen, a new packet should be assumed to have begun.
145 This byte contains the upper five bits of the logical length
146 of the data section, plus a single bit indicating whether this
147 is a data packet or an acknowledgement. The documentation
148 indicates that this bit is 1 for a data packet, but the actual
149 board uses 1 for an acknowledgement. The value of the byte is
150 0x40 + (ack ? 0x20 : 0) + (len >> 6)
151 (we always have 0 <= len < 1024). Acknowledgement packets do
152 not carry data, and must have a data length of 0.
154 LEN1 This byte contains the lower six bits of the logical length of
155 the data section. The value is
158 SEQ This byte contains the six bit sequence number of the packet.
161 An acknowlegment packet contains the sequence number of the
162 packet being acknowledged plus 1 modulo 64. Data packets are
163 transmitted in sequence. There may only be one outstanding
164 unacknowledged data packet at a time. The sequence numbers
165 are independent in each direction. If an acknowledgement for
166 the previous packet is received (i.e., an acknowledgement with
167 the sequence number of the packet just sent) the packet just
168 sent should be retransmitted. If no acknowledgement is
169 received within a timeout period, the packet should be
170 retransmitted. This has an unfortunate failure condition on a
171 high-latency line, as a delayed acknowledgement may lead to an
172 endless series of duplicate packets.
174 DATA The actual data bytes follow. The following characters are
175 escaped inline with DLE (ASCII 020, or ^P):
181 The additional DLE characters are not counted in the logical
182 length stored in the TYPE_LEN and LEN1 bytes.
187 These bytes contain an 18 bit checksum of the complete
188 contents of the packet excluding the SEQ byte and the
189 CSUM[123] bytes. The checksum is simply the twos complement
190 addition of all the bytes treated as unsigned characters. The
191 values of the checksum bytes are:
192 CSUM1: 0x40 + ((cksum >> 12) & 0x3f)
193 CSUM2: 0x40 + ((cksum >> 6) & 0x3f)
194 CSUM3: 0x40 + (cksum & 0x3f)
196 It happens that the MIPS remote debugging protocol always
197 communicates with ASCII strings. Because of this, this
198 implementation doesn't bother to handle the DLE quoting mechanism,
199 since it will never be required. */
201 /* The SYN character which starts each packet. */
204 /* The 0x40 used to offset each packet (this value ensures that all of
205 the header and trailer bytes, other than SYN, are printable ASCII
207 #define HDR_OFFSET 0x40
209 /* The indices of the bytes in the packet header. */
210 #define HDR_INDX_SYN 0
211 #define HDR_INDX_TYPE_LEN 1
212 #define HDR_INDX_LEN1 2
213 #define HDR_INDX_SEQ 3
216 /* The data/ack bit in the TYPE_LEN header byte. */
217 #define TYPE_LEN_DA_BIT 0x20
218 #define TYPE_LEN_DATA 0
219 #define TYPE_LEN_ACK TYPE_LEN_DA_BIT
221 /* How to compute the header bytes. */
222 #define HDR_SET_SYN(data, len, seq) (SYN)
223 #define HDR_SET_TYPE_LEN(data, len, seq) \
225 + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \
226 + (((len) >> 6) & 0x1f))
227 #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f))
228 #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq))
230 /* Check that a header byte is reasonable. */
231 #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET)
233 /* Get data from the header. These macros evaluate their argument
235 #define HDR_IS_DATA(hdr) \
236 (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA)
237 #define HDR_GET_LEN(hdr) \
238 ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f)))
239 #define HDR_GET_SEQ(hdr) ((hdr)[HDR_INDX_SEQ] & 0x3f)
241 /* The maximum data length. */
242 #define DATA_MAXLEN 1023
244 /* The trailer offset. */
245 #define TRLR_OFFSET HDR_OFFSET
247 /* The indices of the bytes in the packet trailer. */
248 #define TRLR_INDX_CSUM1 0
249 #define TRLR_INDX_CSUM2 1
250 #define TRLR_INDX_CSUM3 2
251 #define TRLR_LENGTH 3
253 /* How to compute the trailer bytes. */
254 #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f))
255 #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f))
256 #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f))
258 /* Check that a trailer byte is reasonable. */
259 #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET)
261 /* Get data from the trailer. This evaluates its argument multiple
263 #define TRLR_GET_CKSUM(trlr) \
264 ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \
265 + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \
266 + ((trlr)[TRLR_INDX_CSUM3] & 0x3f))
268 /* The sequence number modulos. */
269 #define SEQ_MODULOS (64)
271 enum mips_monitor_type
{
272 /* IDT/SIM monitor being used: */
274 /* PMON monitor being used: */
276 /* Last and unused value, for sizing vectors, etc. */
279 static enum mips_monitor_type mips_monitor
= MON_LAST
;
281 /* The default monitor prompt text: */
282 static char *mips_monitor_prompt
= TARGET_MONITOR_PROMPT
;
283 /* For the Cogent PMON world this is still not ideal. The default
284 prompt is "PMON> ", unfortunately the user can change the prompt
285 and the new prompt will survive over a power-cycle (EEPROM). This
286 means that the code should really force the monitor prompt to a
287 known value as the very first action, and that the
288 "mips_monitor_prompt" support is not needed... since the prompt
289 could be explicitly set to TARGET_MONITOR_PROMPT (even though it
290 may be the prompt for a different monitor). However, this will
291 require changing the mips_initialize reset sequence. (TODO) */
293 /* Set to 1 if the target is open. */
294 static int mips_is_open
;
296 /* Currently active target description (if mips_is_open == 1) */
297 static struct target_ops
*current_ops
;
299 /* Set to 1 while the connection is being initialized. */
300 static int mips_initializing
;
302 /* The next sequence number to send. */
303 static unsigned int mips_send_seq
;
305 /* The next sequence number we expect to receive. */
306 static unsigned int mips_receive_seq
;
308 /* The time to wait before retransmitting a packet, in seconds. */
309 static int mips_retransmit_wait
= 3;
311 /* The number of times to try retransmitting a packet before giving up. */
312 static int mips_send_retries
= 10;
314 /* The number of garbage characters to accept when looking for an
315 SYN for the next packet. */
316 static int mips_syn_garbage
= 1050;
318 /* The time to wait for a packet, in seconds. */
319 static int mips_receive_wait
= 5;
321 /* Set if we have sent a packet to the board but have not yet received
323 static int mips_need_reply
= 0;
325 /* Handle used to access serial I/O stream. */
326 static serial_t mips_desc
;
328 /* Counts the number of times the user tried to interrupt the target (usually
330 static int interrupt_count
;
332 /* If non-zero, means that the target is running. */
333 static int mips_wait_flag
= 0;
335 /* If non-zero, monitor supports breakpoint commands. */
336 static monitor_supports_breakpoints
= 0;
338 /* Data cache header. */
340 static DCACHE
*mips_dcache
;
342 /* Non-zero means that we've just hit a read or write watchpoint */
343 static int hit_watchpoint
;
345 /* Handle low-level error that we can't recover from. Note that just
346 error()ing out from target_wait or some such low-level place will cause
347 all hell to break loose--the rest of GDB will tend to get left in an
348 inconsistent state. */
351 #ifdef ANSI_PROTOTYPES
352 mips_error (char *string
, ...)
354 mips_error (va_alist
)
360 #ifdef ANSI_PROTOTYPES
361 va_start (args
, string
);
365 string
= va_arg (args
, char *);
368 target_terminal_ours ();
369 wrap_here(""); /* Force out any buffered output */
370 gdb_flush (gdb_stdout
);
372 fprintf_filtered (gdb_stderr
, error_pre_print
);
373 vfprintf_filtered (gdb_stderr
, string
, args
);
374 fprintf_filtered (gdb_stderr
, "\n");
376 gdb_flush (gdb_stderr
);
378 /* Clean up in such a way that mips_close won't try to talk to the
379 board (it almost surely won't work since we weren't able to talk to
382 SERIAL_CLOSE (mips_desc
);
384 printf_unfiltered ("Ending remote MIPS debugging.\n");
385 target_mourn_inferior ();
387 return_to_top_level (RETURN_ERROR
);
390 /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if
404 /* Must use SERIAL_READCHAR here cuz mips_readchar would get confused if we
405 were waiting for the mips_monitor_prompt... */
407 c
= SERIAL_READCHAR (mips_desc
, 2);
409 if (c
== SERIAL_TIMEOUT
)
429 /* Read the required number of characters into the given buffer (which
430 is assumed to be large enough). The only failure is a timeout. */
432 mips_getstring (string
, n
)
442 c
= SERIAL_READCHAR (mips_desc
, 2);
444 if (c
== SERIAL_TIMEOUT
) {
445 fprintf_unfiltered (stderr
, "Failed to read %d characters from target (TIMEOUT)\n", n
);
456 /* Read a character from the remote, aborting on error. Returns
457 SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR
458 returns). FIXME: If we see the string mips_monitor_prompt from
459 the board, then we are debugging on the main console port, and we
460 have somehow dropped out of remote debugging mode. In this case,
461 we automatically go back in to remote debugging mode. This is a
462 hack, put in because I can't find any way for a program running on
463 the remote board to terminate without also ending remote debugging
464 mode. I assume users won't have any trouble with this; for one
465 thing, the IDT documentation generally assumes that the remote
466 debugging port is not the console port. This is, however, very
467 convenient for DejaGnu when you only have one connected serial
471 mips_readchar (timeout
)
475 static int state
= 0;
476 static int mips_monitor_prompt_len
= -1;
478 /* NASTY, since we assume that the prompt does not change after the
479 first mips_readchar call: */
480 if (mips_monitor_prompt_len
= -1)
481 mips_monitor_prompt_len
= strlen(mips_monitor_prompt
);
483 #ifdef MAINTENANCE_CMDS
488 if (i
== -1 && watchdog
> 0)
493 if (state
== mips_monitor_prompt_len
)
495 ch
= SERIAL_READCHAR (mips_desc
, timeout
);
496 #ifdef MAINTENANCE_CMDS
497 if (ch
== SERIAL_TIMEOUT
&& timeout
== -1) /* Watchdog went off */
499 target_mourn_inferior ();
500 error ("Watchdog has expired. Target detached.\n");
503 if (ch
== SERIAL_EOF
)
504 mips_error ("End of file from remote");
505 if (ch
== SERIAL_ERROR
)
506 mips_error ("Error reading from remote: %s", safe_strerror (errno
));
507 if (remote_debug
> 1)
509 /* Don't use _filtered; we can't deal with a QUIT out of
510 target_wait, and I think this might be called from there. */
511 if (ch
!= SERIAL_TIMEOUT
)
512 printf_unfiltered ("Read '%c' %d 0x%x\n", ch
, ch
, ch
);
514 printf_unfiltered ("Timed out in read\n");
517 /* If we have seen mips_monitor_prompt and we either time out, or
518 we see a @ (which was echoed from a packet we sent), reset the
519 board as described above. The first character in a packet after
520 the SYN (which is not echoed) is always an @ unless the packet is
521 more than 64 characters long, which ours never are. */
522 if ((ch
== SERIAL_TIMEOUT
|| ch
== '@')
523 && state
== mips_monitor_prompt_len
524 && ! mips_initializing
)
526 if (remote_debug
> 0)
527 /* Don't use _filtered; we can't deal with a QUIT out of
528 target_wait, and I think this might be called from there. */
529 printf_unfiltered ("Reinitializing MIPS debugging mode\n");
536 /* At this point, about the only thing we can do is abort the command
537 in progress and get back to command level as quickly as possible. */
539 error ("Remote board reset, debug protocol re-initialized.");
542 if (ch
== mips_monitor_prompt
[state
])
550 /* Get a packet header, putting the data in the supplied buffer.
551 PGARBAGE is a pointer to the number of garbage characters received
552 so far. CH is the last character received. Returns 0 for success,
553 or -1 for timeout. */
556 mips_receive_header (hdr
, pgarbage
, ch
, timeout
)
566 /* Wait for a SYN. mips_syn_garbage is intended to prevent
567 sitting here indefinitely if the board sends us one garbage
568 character per second. ch may already have a value from the
569 last time through the loop. */
572 ch
= mips_readchar (timeout
);
573 if (ch
== SERIAL_TIMEOUT
)
577 /* Printing the character here lets the user of gdb see
578 what the program is outputting, if the debugging is
579 being done on the console port. Don't use _filtered;
580 we can't deal with a QUIT out of target_wait. */
581 if (! mips_initializing
|| remote_debug
> 0)
583 /* Note that the host's idea of newline may not
584 correspond to the target's idea, so recognize
585 newline by its actual ASCII code, but write it
586 out using the \n notation. */
587 if (ch
< 0x20 && ch
!= '\012')
589 putchar_unfiltered ('^');
590 putchar_unfiltered (ch
+ 0x40);
592 else if (ch
== '\012')
593 putchar_unfiltered ('\n');
595 putchar_unfiltered (ch
);
596 gdb_flush (gdb_stdout
);
600 if (mips_syn_garbage
> 0
601 && *pgarbage
> mips_syn_garbage
)
602 mips_error ("Debug protocol failure: more than %d characters before a sync.",
607 /* Get the packet header following the SYN. */
608 for (i
= 1; i
< HDR_LENGTH
; i
++)
610 ch
= mips_readchar (timeout
);
611 if (ch
== SERIAL_TIMEOUT
)
613 /* Make sure this is a header byte. */
614 if (ch
== SYN
|| ! HDR_CHECK (ch
))
620 /* If we got the complete header, we can return. Otherwise we
621 loop around and keep looking for SYN. */
627 /* Get a packet header, putting the data in the supplied buffer.
628 PGARBAGE is a pointer to the number of garbage characters received
629 so far. The last character read is returned in *PCH. Returns 0
630 for success, -1 for timeout, -2 for error. */
633 mips_receive_trailer (trlr
, pgarbage
, pch
, timeout
)
642 for (i
= 0; i
< TRLR_LENGTH
; i
++)
644 ch
= mips_readchar (timeout
);
646 if (ch
== SERIAL_TIMEOUT
)
648 if (! TRLR_CHECK (ch
))
655 /* Get the checksum of a packet. HDR points to the packet header.
656 DATA points to the packet data. LEN is the length of DATA. */
659 mips_cksum (hdr
, data
, len
)
660 const unsigned char *hdr
;
661 const unsigned char *data
;
664 register const unsigned char *p
;
670 /* The initial SYN is not included in the checksum. */
684 /* Send a packet containing the given ASCII string. */
687 mips_send_packet (s
, get_ack
)
692 unsigned char *packet
;
697 if (len
> DATA_MAXLEN
)
698 mips_error ("MIPS protocol data packet too long: %s", s
);
700 packet
= (unsigned char *) alloca (HDR_LENGTH
+ len
+ TRLR_LENGTH
+ 1);
702 packet
[HDR_INDX_SYN
] = HDR_SET_SYN (1, len
, mips_send_seq
);
703 packet
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (1, len
, mips_send_seq
);
704 packet
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (1, len
, mips_send_seq
);
705 packet
[HDR_INDX_SEQ
] = HDR_SET_SEQ (1, len
, mips_send_seq
);
707 memcpy (packet
+ HDR_LENGTH
, s
, len
);
709 cksum
= mips_cksum (packet
, packet
+ HDR_LENGTH
, len
);
710 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
711 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
712 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
714 /* Increment the sequence number. This will set mips_send_seq to
715 the sequence number we expect in the acknowledgement. */
716 mips_send_seq
= (mips_send_seq
+ 1) % SEQ_MODULOS
;
718 /* We can only have one outstanding data packet, so we just wait for
719 the acknowledgement here. Keep retransmitting the packet until
720 we get one, or until we've tried too many times. */
721 for (try = 0; try < mips_send_retries
; try++)
726 if (remote_debug
> 0)
728 /* Don't use _filtered; we can't deal with a QUIT out of
729 target_wait, and I think this might be called from there. */
730 packet
[HDR_LENGTH
+ len
+ TRLR_LENGTH
] = '\0';
731 printf_unfiltered ("Writing \"%s\"\n", packet
+ 1);
734 if (SERIAL_WRITE (mips_desc
, packet
,
735 HDR_LENGTH
+ len
+ TRLR_LENGTH
) != 0)
736 mips_error ("write to target failed: %s", safe_strerror (errno
));
745 unsigned char hdr
[HDR_LENGTH
+ 1];
746 unsigned char trlr
[TRLR_LENGTH
+ 1];
750 /* Get the packet header. If we time out, resend the data
752 err
= mips_receive_header (hdr
, &garbage
, ch
, mips_retransmit_wait
);
758 /* If we get a data packet, assume it is a duplicate and
759 ignore it. FIXME: If the acknowledgement is lost, this
760 data packet may be the packet the remote sends after the
762 if (HDR_IS_DATA (hdr
)) {
765 /* Ignore any errors raised whilst attempting to ignore
768 len
= HDR_GET_LEN (hdr
);
770 for (i
= 0; i
< len
; i
++)
774 rch
= mips_readchar (2);
780 if (rch
== SERIAL_TIMEOUT
)
782 /* ignore the character */
786 (void) mips_receive_trailer (trlr
, &garbage
, &ch
, 2);
788 /* We don't bother checking the checksum, or providing an
789 ACK to the packet. */
793 /* If the length is not 0, this is a garbled packet. */
794 if (HDR_GET_LEN (hdr
) != 0)
797 /* Get the packet trailer. */
798 err
= mips_receive_trailer (trlr
, &garbage
, &ch
,
799 mips_retransmit_wait
);
801 /* If we timed out, resend the data packet. */
805 /* If we got a bad character, reread the header. */
809 /* If the checksum does not match the trailer checksum, this
810 is a bad packet; ignore it. */
811 if (mips_cksum (hdr
, (unsigned char *) NULL
, 0)
812 != TRLR_GET_CKSUM (trlr
))
815 if (remote_debug
> 0)
817 hdr
[HDR_LENGTH
] = '\0';
818 trlr
[TRLR_LENGTH
] = '\0';
819 /* Don't use _filtered; we can't deal with a QUIT out of
820 target_wait, and I think this might be called from there. */
821 printf_unfiltered ("Got ack %d \"%s%s\"\n",
822 HDR_GET_SEQ (hdr
), hdr
+ 1, trlr
);
825 /* If this ack is for the current packet, we're done. */
826 seq
= HDR_GET_SEQ (hdr
);
827 if (seq
== mips_send_seq
)
830 /* If this ack is for the last packet, resend the current
832 if ((seq
+ 1) % SEQ_MODULOS
== mips_send_seq
)
835 /* Otherwise this is a bad ack; ignore it. Increment the
836 garbage count to ensure that we do not stay in this loop
842 mips_error ("Remote did not acknowledge packet");
845 /* Receive and acknowledge a packet, returning the data in BUFF (which
846 should be DATA_MAXLEN + 1 bytes). The protocol documentation
847 implies that only the sender retransmits packets, so this code just
848 waits silently for a packet. It returns the length of the received
849 packet. If THROW_ERROR is nonzero, call error() on errors. If not,
850 don't print an error message and return -1. */
853 mips_receive_packet (buff
, throw_error
, timeout
)
861 unsigned char ack
[HDR_LENGTH
+ TRLR_LENGTH
+ 1];
868 unsigned char hdr
[HDR_LENGTH
];
869 unsigned char trlr
[TRLR_LENGTH
];
873 if (mips_receive_header (hdr
, &garbage
, ch
, timeout
) != 0)
876 mips_error ("Timed out waiting for remote packet");
883 /* An acknowledgement is probably a duplicate; ignore it. */
884 if (! HDR_IS_DATA (hdr
))
886 len
= HDR_GET_LEN (hdr
);
887 /* Check if the length is valid for an ACK, we may aswell
888 try and read the remainder of the packet: */
891 /* Ignore the error condition, since we are going to
892 ignore the packet anyway. */
893 (void) mips_receive_trailer (trlr
, &garbage
, &ch
, timeout
);
895 /* Don't use _filtered; we can't deal with a QUIT out of
896 target_wait, and I think this might be called from there. */
897 if (remote_debug
> 0)
898 printf_unfiltered ("Ignoring unexpected ACK\n");
902 len
= HDR_GET_LEN (hdr
);
903 for (i
= 0; i
< len
; i
++)
907 rch
= mips_readchar (timeout
);
913 if (rch
== SERIAL_TIMEOUT
)
916 mips_error ("Timed out waiting for remote packet");
925 /* Don't use _filtered; we can't deal with a QUIT out of
926 target_wait, and I think this might be called from there. */
927 if (remote_debug
> 0)
928 printf_unfiltered ("Got new SYN after %d chars (wanted %d)\n",
933 err
= mips_receive_trailer (trlr
, &garbage
, &ch
, timeout
);
937 mips_error ("Timed out waiting for packet");
943 /* Don't use _filtered; we can't deal with a QUIT out of
944 target_wait, and I think this might be called from there. */
945 if (remote_debug
> 0)
946 printf_unfiltered ("Got SYN when wanted trailer\n");
950 /* If this is the wrong sequence number, ignore it. */
951 if (HDR_GET_SEQ (hdr
) != mips_receive_seq
)
953 /* Don't use _filtered; we can't deal with a QUIT out of
954 target_wait, and I think this might be called from there. */
955 if (remote_debug
> 0)
956 printf_unfiltered ("Ignoring sequence number %d (want %d)\n",
957 HDR_GET_SEQ (hdr
), mips_receive_seq
);
961 if (mips_cksum (hdr
, buff
, len
) == TRLR_GET_CKSUM (trlr
))
964 if (remote_debug
> 0)
965 /* Don't use _filtered; we can't deal with a QUIT out of
966 target_wait, and I think this might be called from there. */
967 printf_unfiltered ("Bad checksum; data %d, trailer %d\n",
968 mips_cksum (hdr
, buff
, len
),
969 TRLR_GET_CKSUM (trlr
));
971 /* The checksum failed. Send an acknowledgement for the
972 previous packet to tell the remote to resend the packet. */
973 ack
[HDR_INDX_SYN
] = HDR_SET_SYN (0, 0, mips_receive_seq
);
974 ack
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq
);
975 ack
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (0, 0, mips_receive_seq
);
976 ack
[HDR_INDX_SEQ
] = HDR_SET_SEQ (0, 0, mips_receive_seq
);
978 cksum
= mips_cksum (ack
, (unsigned char *) NULL
, 0);
980 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
981 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
982 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
984 if (remote_debug
> 0)
986 ack
[HDR_LENGTH
+ TRLR_LENGTH
] = '\0';
987 /* Don't use _filtered; we can't deal with a QUIT out of
988 target_wait, and I think this might be called from there. */
989 printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq
,
993 if (SERIAL_WRITE (mips_desc
, ack
, HDR_LENGTH
+ TRLR_LENGTH
) != 0)
996 mips_error ("write to target failed: %s", safe_strerror (errno
));
1002 if (remote_debug
> 0)
1005 /* Don't use _filtered; we can't deal with a QUIT out of
1006 target_wait, and I think this might be called from there. */
1007 printf_unfiltered ("Got packet \"%s\"\n", buff
);
1010 /* We got the packet. Send an acknowledgement. */
1011 mips_receive_seq
= (mips_receive_seq
+ 1) % SEQ_MODULOS
;
1013 ack
[HDR_INDX_SYN
] = HDR_SET_SYN (0, 0, mips_receive_seq
);
1014 ack
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq
);
1015 ack
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (0, 0, mips_receive_seq
);
1016 ack
[HDR_INDX_SEQ
] = HDR_SET_SEQ (0, 0, mips_receive_seq
);
1018 cksum
= mips_cksum (ack
, (unsigned char *) NULL
, 0);
1020 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
1021 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
1022 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
1024 if (remote_debug
> 0)
1026 ack
[HDR_LENGTH
+ TRLR_LENGTH
] = '\0';
1027 /* Don't use _filtered; we can't deal with a QUIT out of
1028 target_wait, and I think this might be called from there. */
1029 printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq
,
1033 if (SERIAL_WRITE (mips_desc
, ack
, HDR_LENGTH
+ TRLR_LENGTH
) != 0)
1036 mips_error ("write to target failed: %s", safe_strerror (errno
));
1044 /* Optionally send a request to the remote system and optionally wait
1045 for the reply. This implements the remote debugging protocol,
1046 which is built on top of the packet protocol defined above. Each
1047 request has an ADDR argument and a DATA argument. The following
1048 requests are defined:
1050 \0 don't send a request; just wait for a reply
1051 i read word from instruction space at ADDR
1052 d read word from data space at ADDR
1053 I write DATA to instruction space at ADDR
1054 D write DATA to data space at ADDR
1055 r read register number ADDR
1056 R set register number ADDR to value DATA
1057 c continue execution (if ADDR != 1, set pc to ADDR)
1058 s single step (if ADDR != 1, set pc to ADDR)
1060 The read requests return the value requested. The write requests
1061 return the previous value in the changed location. The execution
1062 requests return a UNIX wait value (the approximate signal which
1063 caused execution to stop is in the upper eight bits).
1065 If PERR is not NULL, this function waits for a reply. If an error
1066 occurs, it sets *PERR to 1 and sets errno according to what the
1067 target board reports. */
1070 mips_request (cmd
, addr
, data
, perr
, timeout
, buff
)
1078 char myBuff
[DATA_MAXLEN
+ 1];
1085 if (buff
== (char *) NULL
)
1090 if (mips_need_reply
)
1091 fatal ("mips_request: Trying to send command before reply");
1092 sprintf (buff
, "0x0 %c 0x%x 0x%x", cmd
, addr
, data
);
1093 mips_send_packet (buff
, 1);
1094 mips_need_reply
= 1;
1097 if (perr
== (int *) NULL
)
1100 if (! mips_need_reply
)
1101 fatal ("mips_request: Trying to get reply before command");
1103 mips_need_reply
= 0;
1105 len
= mips_receive_packet (buff
, 1, timeout
);
1108 if (sscanf (buff
, "0x%x %c 0x%x 0x%x",
1109 &rpid
, &rcmd
, &rerrflg
, &rresponse
) != 4
1110 || (cmd
!= '\0' && rcmd
!= cmd
))
1111 mips_error ("Bad response from remote board");
1117 /* FIXME: This will returns MIPS errno numbers, which may or may
1118 not be the same as errno values used on other systems. If
1119 they stick to common errno values, they will be the same, but
1120 if they don't, they must be translated. */
1131 mips_initialize_cleanups (arg
)
1134 mips_initializing
= 0;
1138 mips_send_command (cmd
, prompt
)
1142 SERIAL_WRITE (mips_desc
, cmd
, strlen(cmd
));
1144 mips_expect ("\012");
1146 mips_expect (mips_monitor_prompt
);
1149 /* Enter remote (dbx) debug mode: */
1153 /* Reset the sequence numbers, ready for the new debug sequence: */
1155 mips_receive_seq
= 0;
1157 if (mips_monitor
== MON_PMON
)
1158 mips_send_command ("debug\015", 0);
1159 else /* assume IDT monitor by default */
1160 mips_send_command ("db tty0\015", 0);
1162 SERIAL_WRITE (mips_desc
, "\015", sizeof "\015" - 1);
1164 /* We don't need to absorb any spurious characters here, since the
1165 mips_receive_header will eat up a reasonable number of characters
1166 whilst looking for the SYN, however this avoids the "garbage"
1167 being displayed to the user. */
1168 if (mips_monitor
== MON_PMON
)
1169 mips_expect ("\015");
1172 char buff
[DATA_MAXLEN
+ 1];
1173 if (mips_receive_packet (buff
, 1, 3) < 0)
1174 mips_error ("Failed to initialize (didn't receive packet).");
1178 /* Exit remote (dbx) debug mode, returning to the monitor prompt: */
1184 mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err
,
1185 mips_receive_wait
, NULL
);
1187 if (mips_monitor
== MON_PMON
&& !mips_expect ("Exiting remote debug mode"))
1190 if (!mips_expect ("\015\012"))
1193 if (!mips_expect (mips_monitor_prompt
))
1199 /* Initialize a new connection to the MIPS board, and make sure we are
1200 really connected. */
1206 struct cleanup
*old_cleanups
= make_cleanup (mips_initialize_cleanups
, NULL
);
1209 /* What is this code doing here? I don't see any way it can happen, and
1210 it might mean mips_initializing didn't get cleared properly.
1211 So I'll make it a warning. */
1213 if (mips_initializing
)
1215 warning ("internal error: mips_initialize called twice");
1220 mips_initializing
= 1;
1222 /* At this point, the packit protocol isn't responding. We'll try getting
1223 into the monitor, and restarting the protocol. */
1225 /* Force the system into the monitor. After this we *should* be at
1226 the mips_monitor_prompt. */
1227 if (mips_monitor
== MON_PMON
)
1228 j
= 0; /* start by checking if we are already at the prompt */
1230 j
= 1; /* start by sending a break */
1235 case 0: /* First, try sending a CR */
1236 SERIAL_FLUSH_INPUT (mips_desc
);
1237 SERIAL_WRITE (mips_desc
, "\015", 1);
1239 case 1: /* First, try sending a break */
1240 SERIAL_SEND_BREAK (mips_desc
);
1242 case 2: /* Then, try a ^C */
1243 SERIAL_WRITE (mips_desc
, "\003", 1);
1245 case 3: /* Then, try escaping from download */
1247 if (mips_monitor
== MON_PMON
)
1251 /* We shouldn't need to send multiple termination
1252 sequences, since the target performs line (or
1253 block) reads, and then processes those
1254 packets. In-case we were downloading a large packet
1255 we flush the output buffer before inserting a
1256 termination sequence. */
1257 SERIAL_FLUSH_OUTPUT (mips_desc
);
1258 sprintf (tbuff
, "\015/E/E\015");
1259 SERIAL_WRITE (mips_desc
, tbuff
, 6);
1266 /* We are possibly in binary download mode, having
1267 aborted in the middle of an S-record. ^C won't
1268 work because of binary mode. The only reliable way
1269 out is to send enough termination packets (8 bytes)
1270 to fill up and then overflow the largest size
1271 S-record (255 bytes in this case). This amounts to
1275 mips_make_srec (srec
, '7', 0, NULL
, 0);
1277 for (i
= 1; i
<= 33; i
++)
1279 SERIAL_WRITE (mips_desc
, srec
, 8);
1281 if (SERIAL_READCHAR (mips_desc
, 0) >= 0)
1282 break; /* Break immediatly if we get something from
1289 mips_error ("Failed to initialize.");
1292 if (mips_expect (mips_monitor_prompt
))
1296 if (mips_monitor
== MON_PMON
)
1298 /* Ensure the correct target state: */
1299 mips_send_command ("set regsize 64\015", -1);
1300 mips_send_command ("set hostport tty0\015", -1);
1301 mips_send_command ("set brkcmd \"\"\015", -1);
1302 /* Delete all the current breakpoints: */
1303 mips_send_command ("db *\015", -1);
1304 /* NOTE: PMON does not have breakpoint support through the
1305 "debug" mode, only at the monitor command-line. */
1308 mips_enter_debug ();
1310 /* Clear all breakpoints: */
1311 if (common_breakpoint ('b', -1, 0, NULL
))
1312 monitor_supports_breakpoints
= 0;
1314 monitor_supports_breakpoints
= 1;
1316 do_cleanups (old_cleanups
);
1318 /* If this doesn't call error, we have connected; we don't care if
1319 the request itself succeeds or fails. */
1321 mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err
,
1322 mips_receive_wait
, NULL
);
1323 set_current_frame (create_new_frame (read_fp (), read_pc ()));
1324 select_frame (get_current_frame (), 0);
1327 /* Open a connection to the remote board. */
1329 common_open (ops
, name
, from_tty
)
1330 struct target_ops
*ops
;
1338 "To open a MIPS remote debugging connection, you need to specify what serial\n\
1339 device is attached to the target board (e.g., /dev/ttya).");
1341 target_preopen (from_tty
);
1344 unpush_target (current_ops
);
1346 mips_desc
= SERIAL_OPEN (name
);
1347 if (mips_desc
== (serial_t
) NULL
)
1348 perror_with_name (name
);
1350 if (baud_rate
!= -1)
1352 if (SERIAL_SETBAUDRATE (mips_desc
, baud_rate
))
1354 SERIAL_CLOSE (mips_desc
);
1355 perror_with_name (name
);
1359 SERIAL_RAW (mips_desc
);
1367 printf_unfiltered ("Remote MIPS debugging using %s\n", name
);
1369 /* Switch to using remote target now. */
1372 /* FIXME: Should we call start_remote here? */
1374 /* Try to figure out the processor model if possible. */
1375 ptype
= mips_read_processor_type ();
1377 mips_set_processor_type_command (strsave (ptype
), 0);
1379 /* This is really the job of start_remote however, that makes an assumption
1380 that the target is about to print out a status message of some sort. That
1381 doesn't happen here (in fact, it may not be possible to get the monitor to
1382 send the appropriate packet). */
1384 flush_cached_frames ();
1385 registers_changed ();
1386 stop_pc
= read_pc ();
1387 set_current_frame (create_new_frame (read_fp (), stop_pc
));
1388 select_frame (get_current_frame (), 0);
1389 print_stack_frame (selected_frame
, -1, 1);
1393 mips_open (name
, from_tty
)
1397 mips_monitor
= MON_IDT
;
1398 common_open (&mips_ops
, name
, from_tty
);
1402 pmon_open (name
, from_tty
)
1406 /* The PMON monitor has a prompt different from the default
1407 "TARGET_MONITOR_PROMPT": */
1408 mips_monitor_prompt
= "PMON> ";
1409 mips_monitor
= MON_PMON
;
1410 common_open (&pmon_ops
, name
, from_tty
);
1414 /* Close a connection to the remote board. */
1417 mips_close (quitting
)
1426 /* Get the board out of remote debugging mode. */
1427 (void) mips_exit_debug ();
1429 SERIAL_CLOSE (mips_desc
);
1433 /* Detach from the remote board. */
1436 mips_detach (args
, from_tty
)
1441 error ("Argument given to \"detach\" when remotely debugging.");
1448 printf_unfiltered ("Ending remote MIPS debugging.\n");
1451 /* Tell the target board to resume. This does not wait for a reply
1455 mips_resume (pid
, step
, siggnal
)
1457 enum target_signal siggnal
;
1460 /* start-sanitize-gm */
1461 #ifndef GENERAL_MAGIC
1462 if (siggnal
!= TARGET_SIGNAL_0
)
1464 ("Can't send signals to a remote system. Try `handle %s ignore'.",
1465 target_signal_to_name (siggnal
));
1466 #endif /* GENERAL_MAGIC */
1467 /* end-sanitize-gm */
1469 mips_request (step
? 's' : 'c',
1471 (unsigned int) siggnal
,
1473 mips_receive_wait
, NULL
);
1476 /* Return the signal corresponding to SIG, where SIG is the number which
1477 the MIPS protocol uses for the signal. */
1479 mips_signal_from_protocol (sig
)
1482 /* We allow a few more signals than the IDT board actually returns, on
1483 the theory that there is at least *some* hope that perhaps the numbering
1484 for these signals is widely agreed upon. */
1487 return TARGET_SIGNAL_UNKNOWN
;
1489 /* Don't want to use target_signal_from_host because we are converting
1490 from MIPS signal numbers, not host ones. Our internal numbers
1491 match the MIPS numbers for the signals the board can return, which
1492 are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */
1493 return (enum target_signal
) sig
;
1496 /* Wait until the remote stops, and return a wait status. */
1499 mips_wait (pid
, status
)
1501 struct target_waitstatus
*status
;
1505 char buff
[DATA_MAXLEN
];
1510 interrupt_count
= 0;
1513 /* If we have not sent a single step or continue command, then the
1514 board is waiting for us to do something. Return a status
1515 indicating that it is stopped. */
1516 if (! mips_need_reply
)
1518 status
->kind
= TARGET_WAITKIND_STOPPED
;
1519 status
->value
.sig
= TARGET_SIGNAL_TRAP
;
1523 /* No timeout; we sit here as long as the program continues to execute. */
1525 rstatus
= mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err
, -1,
1529 mips_error ("Remote failure: %s", safe_strerror (errno
));
1531 nfields
= sscanf (buff
, "0x%*x %*c 0x%*x 0x%*x 0x%x 0x%x 0x%x 0x%*x %s",
1532 &rpc
, &rfp
, &rsp
, flags
);
1534 /* See if we got back extended status. If so, pick out the pc, fp, sp, etc... */
1536 if (nfields
== 7 || nfields
== 9)
1538 char buf
[MAX_REGISTER_RAW_SIZE
];
1540 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (PC_REGNUM
), rpc
);
1541 supply_register (PC_REGNUM
, buf
);
1543 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (PC_REGNUM
), rfp
);
1544 supply_register (30, buf
); /* This register they are avoiding and so it is unnamed */
1546 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (SP_REGNUM
), rsp
);
1547 supply_register (SP_REGNUM
, buf
);
1549 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (FP_REGNUM
), 0);
1550 supply_register (FP_REGNUM
, buf
);
1556 for (i
= 0; i
<= 2; i
++)
1557 if (flags
[i
] == 'r' || flags
[i
] == 'w')
1559 else if (flags
[i
] == '\000')
1564 /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG
1565 and so on, because the constants we want here are determined by the
1566 MIPS protocol and have nothing to do with what host we are running on. */
1567 if ((rstatus
& 0377) == 0)
1569 status
->kind
= TARGET_WAITKIND_EXITED
;
1570 status
->value
.integer
= (((rstatus
) >> 8) & 0377);
1572 else if ((rstatus
& 0377) == 0177)
1574 status
->kind
= TARGET_WAITKIND_STOPPED
;
1575 status
->value
.sig
= mips_signal_from_protocol (((rstatus
) >> 8) & 0377);
1579 status
->kind
= TARGET_WAITKIND_SIGNALLED
;
1580 status
->value
.sig
= mips_signal_from_protocol (rstatus
& 0177);
1587 pmon_wait (pid
, status
)
1589 struct target_waitstatus
*status
;
1593 char buff
[DATA_MAXLEN
];
1595 interrupt_count
= 0;
1598 /* If we have not sent a single step or continue command, then the
1599 board is waiting for us to do something. Return a status
1600 indicating that it is stopped. */
1601 if (! mips_need_reply
)
1603 status
->kind
= TARGET_WAITKIND_STOPPED
;
1604 status
->value
.sig
= TARGET_SIGNAL_TRAP
;
1608 /* Sit, polling the serial until the target decides to talk to
1609 us. NOTE: the timeout value we use is used not just for the
1610 first character, but for all the characters. */
1612 rstatus
= mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err
, -1,
1616 mips_error ("Remote failure: %s", safe_strerror (errno
));
1618 /* NOTE: The following (sig) numbers are defined by PMON:
1619 SPP_SIGTRAP 5 breakpoint
1627 /* On returning from a continue, the PMON monitor seems to start
1628 echoing back the messages we send prior to sending back the
1629 ACK. The code can cope with this, but to try and avoid the
1630 unnecessary serial traffic, and "spurious" characters displayed
1631 to the user, we cheat and reset the debug protocol. The problems
1632 seems to be caused by a check on the number of arguments, and the
1633 command length, within the monitor causing it to echo the command
1636 mips_enter_debug ();
1638 /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG
1639 and so on, because the constants we want here are determined by the
1640 MIPS protocol and have nothing to do with what host we are running on. */
1641 if ((rstatus
& 0377) == 0)
1643 status
->kind
= TARGET_WAITKIND_EXITED
;
1644 status
->value
.integer
= (((rstatus
) >> 8) & 0377);
1646 else if ((rstatus
& 0377) == 0177)
1648 status
->kind
= TARGET_WAITKIND_STOPPED
;
1649 status
->value
.sig
= mips_signal_from_protocol (((rstatus
) >> 8) & 0377);
1653 status
->kind
= TARGET_WAITKIND_SIGNALLED
;
1654 status
->value
.sig
= mips_signal_from_protocol (rstatus
& 0177);
1660 /* We have to map between the register numbers used by gdb and the
1661 register numbers used by the debugging protocol. This function
1662 assumes that we are using tm-mips.h. */
1664 #define REGNO_OFFSET 96
1667 mips_map_regno (regno
)
1672 if (regno
>= FP0_REGNUM
&& regno
< FP0_REGNUM
+ 32)
1673 return regno
- FP0_REGNUM
+ 32;
1677 return REGNO_OFFSET
+ 0;
1679 return REGNO_OFFSET
+ 1;
1681 return REGNO_OFFSET
+ 2;
1683 return REGNO_OFFSET
+ 3;
1685 return REGNO_OFFSET
+ 4;
1687 return REGNO_OFFSET
+ 5;
1689 /* FIXME: Is there a way to get the status register? */
1694 /* Fetch the remote registers. */
1697 mips_fetch_registers (regno
)
1700 unsigned LONGEST val
;
1705 for (regno
= 0; regno
< NUM_REGS
; regno
++)
1706 mips_fetch_registers (regno
);
1710 if (regno
== FP_REGNUM
|| regno
== ZERO_REGNUM
)
1711 /* FP_REGNUM on the mips is a hack which is just supposed to read
1712 zero (see also mips-nat.c). */
1716 #if 0 /* Unfortunately the PMON version in the Vr4300 board has been
1717 compiled without the 64bit register access commands. This
1718 means we cannot get hold of the full register width. */
1719 if (mips_monitor
== MON_PMON
)
1720 val
= mips_request ('t', (unsigned int) mips_map_regno (regno
),
1721 (unsigned int) 0, &err
, mips_receive_wait
, NULL
);
1724 val
= mips_request ('r', (unsigned int) mips_map_regno (regno
),
1725 (unsigned int) 0, &err
, mips_receive_wait
, NULL
);
1727 mips_error ("Can't read register %d: %s", regno
,
1728 safe_strerror (errno
));
1732 char buf
[MAX_REGISTER_RAW_SIZE
];
1734 /* We got the number the register holds, but gdb expects to see a
1735 value in the target byte ordering. */
1736 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (regno
), val
);
1737 supply_register (regno
, buf
);
1741 /* Prepare to store registers. The MIPS protocol can store individual
1742 registers, so this function doesn't have to do anything. */
1745 mips_prepare_to_store ()
1749 /* Store remote register(s). */
1752 mips_store_registers (regno
)
1759 for (regno
= 0; regno
< NUM_REGS
; regno
++)
1760 mips_store_registers (regno
);
1764 mips_request ('R', (unsigned int) mips_map_regno (regno
),
1765 (unsigned int) read_register (regno
),
1766 &err
, mips_receive_wait
, NULL
);
1768 mips_error ("Can't write register %d: %s", regno
, safe_strerror (errno
));
1771 /* Fetch a word from the target board. */
1774 mips_fetch_word (addr
)
1780 val
= mips_request ('d', (unsigned int) addr
, (unsigned int) 0, &err
,
1781 mips_receive_wait
, NULL
);
1784 /* Data space failed; try instruction space. */
1785 val
= mips_request ('i', (unsigned int) addr
, (unsigned int) 0, &err
,
1786 mips_receive_wait
, NULL
);
1788 mips_error ("Can't read address 0x%x: %s", addr
, safe_strerror (errno
));
1793 /* Store a word to the target board. Returns errno code or zero for
1794 success. If OLD_CONTENTS is non-NULL, put the old contents of that
1795 memory location there. */
1798 mips_store_word (addr
, val
, old_contents
)
1804 unsigned int oldcontents
;
1806 oldcontents
= mips_request ('D', (unsigned int) addr
, (unsigned int) val
,
1808 mips_receive_wait
, NULL
);
1811 /* Data space failed; try instruction space. */
1812 oldcontents
= mips_request ('I', (unsigned int) addr
,
1813 (unsigned int) val
, &err
,
1814 mips_receive_wait
, NULL
);
1818 if (old_contents
!= NULL
)
1819 store_unsigned_integer (old_contents
, 4, oldcontents
);
1823 /* Read or write LEN bytes from inferior memory at MEMADDR,
1824 transferring to or from debugger address MYADDR. Write to inferior
1825 if SHOULD_WRITE is nonzero. Returns length of data written or
1826 read; 0 for error. Note that protocol gives us the correct value
1827 for a longword, since it transfers values in ASCII. We want the
1828 byte values, so we have to swap the longword values. */
1831 mips_xfer_memory (memaddr
, myaddr
, len
, write
, ignore
)
1836 struct target_ops
*ignore
;
1839 /* Round starting address down to longword boundary. */
1840 register CORE_ADDR addr
= memaddr
&~ 3;
1841 /* Round ending address up; get number of longwords that makes. */
1842 register int count
= (((memaddr
+ len
) - addr
) + 3) / 4;
1843 /* Allocate buffer of that many longwords. */
1844 register char *buffer
= alloca (count
* 4);
1850 /* Fill start and end extra bytes of buffer with existing data. */
1851 if (addr
!= memaddr
|| len
< 4)
1853 /* Need part of initial word -- fetch it. */
1854 store_unsigned_integer (&buffer
[0], 4, mips_fetch_word (addr
));
1859 /* Need part of last word -- fetch it. FIXME: we do this even
1860 if we don't need it. */
1861 store_unsigned_integer (&buffer
[(count
- 1) * 4], 4,
1862 mips_fetch_word (addr
+ (count
- 1) * 4));
1865 /* Copy data to be written over corresponding part of buffer */
1867 memcpy ((char *) buffer
+ (memaddr
& 3), myaddr
, len
);
1869 /* Write the entire buffer. */
1871 for (i
= 0; i
< count
; i
++, addr
+= 4)
1873 status
= mips_store_word (addr
,
1874 extract_unsigned_integer (&buffer
[i
*4], 4),
1876 /* Report each kilobyte (we download 32-bit words at a time) */
1879 printf_unfiltered ("*");
1887 /* FIXME: Do we want a QUIT here? */
1890 printf_unfiltered ("\n");
1894 /* Read all the longwords */
1895 for (i
= 0; i
< count
; i
++, addr
+= 4)
1897 store_unsigned_integer (&buffer
[i
*4], 4, mips_fetch_word (addr
));
1901 /* Copy appropriate bytes out of the buffer. */
1902 memcpy (myaddr
, buffer
+ (memaddr
& 3), len
);
1907 /* Print info on this target. */
1910 mips_files_info (ignore
)
1911 struct target_ops
*ignore
;
1913 printf_unfiltered ("Debugging a MIPS board over a serial line.\n");
1916 /* Kill the process running on the board. This will actually only
1917 work if we are doing remote debugging over the console input. I
1918 think that if IDT/sim had the remote debug interrupt enabled on the
1919 right port, we could interrupt the process with a break signal. */
1924 if (!mips_wait_flag
)
1929 if (interrupt_count
>= 2)
1931 interrupt_count
= 0;
1933 target_terminal_ours ();
1935 if (query ("Interrupted while waiting for the program.\n\
1936 Give up (and stop debugging it)? "))
1938 /* Clean up in such a way that mips_close won't try to talk to the
1939 board (it almost surely won't work since we weren't able to talk to
1943 SERIAL_CLOSE (mips_desc
);
1945 printf_unfiltered ("Ending remote MIPS debugging.\n");
1946 target_mourn_inferior ();
1948 return_to_top_level (RETURN_QUIT
);
1951 target_terminal_inferior ();
1954 if (remote_debug
> 0)
1955 printf_unfiltered ("Sending break\n");
1957 SERIAL_SEND_BREAK (mips_desc
);
1966 SERIAL_WRITE (mips_desc
, &cc
, 1);
1968 target_mourn_inferior ();
1973 /* Start running on the target board. */
1976 mips_create_inferior (execfile
, args
, env
)
1986 Can't pass arguments to remote MIPS board; arguments ignored.");
1987 /* And don't try to use them on the next "run" command. */
1988 execute_command ("set args", 0);
1991 if (execfile
== 0 || exec_bfd
== 0)
1992 error ("No executable file specified");
1994 entry_pt
= (CORE_ADDR
) bfd_get_start_address (exec_bfd
);
1996 init_wait_for_inferior ();
1998 /* FIXME: Should we set inferior_pid here? */
2000 /* start-sanitize-gm */
2001 #ifdef GENERAL_MAGIC
2002 magic_create_inferior_hook ();
2003 proceed (entry_pt
, TARGET_SIGNAL_PWR
, 0);
2005 /* end-sanitize-gm */
2006 proceed (entry_pt
, TARGET_SIGNAL_DEFAULT
, 0);
2007 /* start-sanitize-gm */
2008 #endif /* GENERAL_MAGIC */
2009 /* end-sanitize-gm */
2012 /* Clean up after a process. Actually nothing to do. */
2015 mips_mourn_inferior ()
2017 if (current_ops
!= NULL
)
2018 unpush_target (current_ops
);
2019 generic_mourn_inferior ();
2022 /* We can write a breakpoint and read the shadow contents in one
2025 /* The IDT board uses an unusual breakpoint value, and sometimes gets
2026 confused when it sees the usual MIPS breakpoint instruction. */
2028 #define BREAK_INSN (0x00000a0d)
2029 #define BREAK_INSN_SIZE (4)
2031 /* Insert a breakpoint on targets that don't have any better breakpoint
2032 support. We read the contents of the target location and stash it,
2033 then overwrite it with a breakpoint instruction. ADDR is the target
2034 location in the target machine. CONTENTS_CACHE is a pointer to
2035 memory allocated for saving the target contents. It is guaranteed
2036 by the caller to be long enough to save sizeof BREAKPOINT bytes (this
2037 is accomplished via BREAKPOINT_MAX). */
2040 mips_insert_breakpoint (addr
, contents_cache
)
2042 char *contents_cache
;
2046 if (monitor_supports_breakpoints
)
2047 return common_breakpoint ('B', addr
, 0x3, "f");
2049 return mips_store_word (addr
, BREAK_INSN
, contents_cache
);
2053 mips_remove_breakpoint (addr
, contents_cache
)
2055 char *contents_cache
;
2057 if (monitor_supports_breakpoints
)
2058 return common_breakpoint ('b', addr
, 0, NULL
);
2060 return target_write_memory (addr
, contents_cache
, BREAK_INSN_SIZE
);
2063 #if 0 /* currently not used */
2064 /* PMON does not currently provide support for the debug mode 'b'
2065 commands to manipulate breakpoints. However, if we wanted to use
2066 the monitor breakpoints (rather than the GDB BREAK_INSN version)
2067 then this code performs the work needed to leave debug mode,
2068 set/clear the breakpoint, and then return to debug mode. */
2070 #define PMON_MAX_BP (33) /* 32 SW, 1 HW */
2071 static CORE_ADDR mips_pmon_bp_info
[PMON_MAX_BP
];
2072 /* NOTE: The code relies on this vector being zero-initialised by the system */
2075 pmon_insert_breakpoint (addr
, contents_cache
)
2077 char *contents_cache
;
2081 if (monitor_supports_breakpoints
)
2083 char tbuff
[12]; /* space for breakpoint command */
2087 /* PMON does not support debug level breakpoint set/remove: */
2088 if (mips_exit_debug ())
2089 mips_error ("Failed to exit debug mode");
2091 sprintf (tbuff
, "b %08x\015", addr
);
2092 mips_send_command (tbuff
, 0);
2094 mips_expect ("Bpt ");
2096 if (!mips_getstring (tbuff
, 2))
2098 tbuff
[2] = '\0'; /* terminate the string */
2099 if (sscanf (tbuff
, "%d", &bpnum
) != 1)
2101 fprintf_unfiltered (stderr
, "Invalid decimal breakpoint number from target: %s\n", tbuff
);
2105 mips_expect (" = ");
2107 /* Lead in the hex number we are expecting: */
2111 if (!mips_getstring (&tbuff
[2], 8))
2113 tbuff
[10] = '\0'; /* terminate the string */
2115 if (sscanf (tbuff
, "0x%08x", &bpaddr
) != 1)
2117 fprintf_unfiltered (stderr
, "Invalid hex address from target: %s\n", tbuff
);
2121 if (bpnum
>= PMON_MAX_BP
)
2123 fprintf_unfiltered (stderr
, "Error: Returned breakpoint number %d outside acceptable range (0..%d)\n",
2124 bpnum
, PMON_MAX_BP
- 1);
2129 fprintf_unfiltered (stderr
, "Warning: Breakpoint addresses do not match: 0x%x != 0x%x\n", addr
, bpaddr
);
2131 mips_pmon_bp_info
[bpnum
] = bpaddr
;
2133 mips_expect ("\015\012");
2134 mips_expect (mips_monitor_prompt
);
2136 mips_enter_debug ();
2141 return mips_store_word (addr
, BREAK_INSN
, contents_cache
);
2145 pmon_remove_breakpoint (addr
, contents_cache
)
2147 char *contents_cache
;
2149 if (monitor_supports_breakpoints
)
2152 char tbuff
[7]; /* enough for delete breakpoint command */
2154 for (bpnum
= 0; bpnum
< PMON_MAX_BP
; bpnum
++)
2155 if (mips_pmon_bp_info
[bpnum
] == addr
)
2158 if (bpnum
>= PMON_MAX_BP
)
2160 fprintf_unfiltered (stderr
, "pmon_remove_breakpoint: Failed to find breakpoint at address 0x%x\n", addr
);
2164 if (mips_exit_debug ())
2165 mips_error ("Failed to exit debug mode");
2167 sprintf (tbuff
, "db %02d\015", bpnum
);
2169 mips_send_command (tbuff
, -1);
2170 /* NOTE: If the breakpoint does not exist then a "Bpt <dd> not
2171 set" message will be returned. */
2173 mips_enter_debug ();
2178 return target_write_memory (addr
, contents_cache
, BREAK_INSN_SIZE
);
2182 /* Compute a don't care mask for the region bounding ADDR and ADDR + LEN - 1.
2183 This is used for memory ref breakpoints. */
2185 static unsigned long
2186 calculate_mask (addr
, len
)
2193 mask
= addr
^ (addr
+ len
- 1);
2195 for (i
= 32; i
>= 0; i
--)
2201 mask
= (unsigned long) 0xffffffff >> i
;
2206 /* Set a data watchpoint. ADDR and LEN should be obvious. TYPE is either 1
2207 for a read watchpoint, or 2 for a read/write watchpoint. */
2210 remote_mips_set_watchpoint (addr
, len
, type
)
2215 CORE_ADDR first_addr
;
2219 mask
= calculate_mask (addr
, len
);
2221 first_addr
= addr
& ~mask
;
2231 case 2: /* read/write */
2238 if (common_breakpoint ('B', first_addr
, mask
, flags
))
2245 remote_mips_remove_watchpoint (addr
, len
, type
)
2250 CORE_ADDR first_addr
;
2253 mask
= calculate_mask (addr
, len
);
2255 first_addr
= addr
& ~mask
;
2257 if (common_breakpoint ('b', first_addr
, 0, NULL
))
2264 remote_mips_stopped_by_watchpoint ()
2266 return hit_watchpoint
;
2269 /* This routine generates the a breakpoint command of the form:
2271 0x0 <CMD> <ADDR> <MASK> <FLAGS>
2273 Where <CMD> is one of: `B' to set, or `b' to clear a breakpoint. <ADDR> is
2274 the address of the breakpoint. <MASK> is a don't care mask for addresses.
2275 <FLAGS> is any combination of `r', `w', or `f' for read/write/or fetch. */
2278 common_breakpoint (cmd
, addr
, mask
, flags
)
2285 char buf
[DATA_MAXLEN
+ 1];
2287 int rpid
, rerrflg
, rresponse
;
2291 sprintf (buf
, "0x0 %c 0x%x 0x%x %s", cmd
, addr
, mask
, flags
);
2293 sprintf (buf
, "0x0 %c 0x%x", cmd
, addr
);
2295 mips_send_packet (buf
, 1);
2297 len
= mips_receive_packet (buf
, 1, mips_receive_wait
);
2300 nfields
= sscanf (buf
, "0x%x %c 0x%x 0x%x", &rpid
, &rcmd
, &rerrflg
, &rresponse
);
2304 mips_error ("common_breakpoint: Bad response from remote board: %s", buf
);
2308 if (rresponse
!= 22) /* invalid argument */
2309 fprintf_unfiltered (stderr
, "common_breakpoint (0x%x): Got error: 0x%x\n",
2318 send_srec (srec
, len
, addr
)
2327 SERIAL_WRITE (mips_desc
, srec
, len
);
2329 ch
= mips_readchar (2);
2333 case SERIAL_TIMEOUT
:
2334 error ("Timeout during download.");
2338 case 0x15: /* NACK */
2339 fprintf_unfiltered (gdb_stderr
, "Download got a NACK at byte %d! Retrying.\n", addr
);
2342 error ("Download got unexpected ack char: 0x%x, retrying.\n", ch
);
2347 /* Download a binary file by converting it to S records. */
2350 mips_load_srec (args
)
2355 char *buffer
, srec
[1024];
2357 int srec_frame
= 200;
2359 static int hashmark
= 1;
2361 buffer
= alloca (srec_frame
* 2 + 256);
2363 abfd
= bfd_openr (args
, 0);
2366 printf_filtered ("Unable to open file %s\n", args
);
2370 if (bfd_check_format (abfd
, bfd_object
) == 0)
2372 printf_filtered ("File is not an object file\n");
2376 /* This actually causes a download in the IDT binary format: */
2377 #define LOAD_CMD "load -b -s tty0\015"
2378 mips_send_command (LOAD_CMD
, 0);
2380 for (s
= abfd
->sections
; s
; s
= s
->next
)
2382 if (s
->flags
& SEC_LOAD
)
2386 printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s
->name
, s
->vma
,
2387 s
->vma
+ s
->_raw_size
);
2388 gdb_flush (gdb_stdout
);
2390 for (i
= 0; i
< s
->_raw_size
; i
+= numbytes
)
2392 numbytes
= min (srec_frame
, s
->_raw_size
- i
);
2394 bfd_get_section_contents (abfd
, s
, buffer
, i
, numbytes
);
2396 reclen
= mips_make_srec (srec
, '3', s
->vma
+ i
, buffer
, numbytes
);
2397 send_srec (srec
, reclen
, s
->vma
+ i
);
2401 putchar_unfiltered ('#');
2402 gdb_flush (gdb_stdout
);
2405 } /* Per-packet (or S-record) loop */
2407 putchar_unfiltered ('\n');
2408 } /* Loadable sections */
2411 putchar_unfiltered ('\n');
2413 /* Write a type 7 terminator record. no data for a type 7, and there
2414 is no data, so len is 0. */
2416 reclen
= mips_make_srec (srec
, '7', abfd
->start_address
, NULL
, 0);
2418 send_srec (srec
, reclen
, abfd
->start_address
);
2420 SERIAL_FLUSH_INPUT (mips_desc
);
2424 * mips_make_srec -- make an srecord. This writes each line, one at a
2425 * time, each with it's own header and trailer line.
2426 * An srecord looks like this:
2428 * byte count-+ address
2429 * start ---+ | | data +- checksum
2431 * S01000006F6B692D746573742E73726563E4
2432 * S315000448600000000000000000FC00005900000000E9
2433 * S31A0004000023C1400037DE00F023604000377B009020825000348D
2434 * S30B0004485A0000000000004E
2437 * S<type><length><address><data><checksum>
2441 * is the number of bytes following upto the checksum. Note that
2442 * this is not the number of chars following, since it takes two
2443 * chars to represent a byte.
2447 * 1) two byte address data record
2448 * 2) three byte address data record
2449 * 3) four byte address data record
2450 * 7) four byte address termination record
2451 * 8) three byte address termination record
2452 * 9) two byte address termination record
2455 * is the start address of the data following, or in the case of
2456 * a termination record, the start address of the image
2460 * is the sum of all the raw byte data in the record, from the length
2461 * upwards, modulo 256 and subtracted from 255.
2463 * This routine returns the length of the S-record.
2468 mips_make_srec (buf
, type
, memaddr
, myaddr
, len
)
2472 unsigned char *myaddr
;
2475 unsigned char checksum
;
2478 /* Create the header for the srec. addr_size is the number of bytes in the address,
2479 and 1 is the number of bytes in the count. */
2483 buf
[2] = len
+ 4 + 1; /* len + 4 byte address + 1 byte checksum */
2484 /* This assumes S3 style downloads (4byte addresses). There should
2485 probably be a check, or the code changed to make it more
2487 buf
[3] = memaddr
>> 24;
2488 buf
[4] = memaddr
>> 16;
2489 buf
[5] = memaddr
>> 8;
2491 memcpy (&buf
[7], myaddr
, len
);
2493 /* Note that the checksum is calculated on the raw data, not the
2494 hexified data. It includes the length, address and the data
2495 portions of the packet. */
2497 buf
+= 2; /* Point at length byte */
2498 for (i
= 0; i
< len
+ 4 + 1; i
++)
2506 /* The following manifest controls whether we enable the simple flow
2507 control support provided by the monitor. If enabled the code will
2508 wait for an affirmative ACK between transmitting packets. */
2509 #define DOETXACK (1)
2511 /* The PMON fast-download uses an encoded packet format constructed of
2512 3byte data packets (encoded as 4 printable ASCII characters), and
2513 escape sequences (preceded by a '/'):
2516 'C' compare checksum (12bit value, not included in checksum calculation)
2517 'S' define symbol name (for addr) terminated with "," and padded to 4char boundary
2518 'Z' zero fill multiple of 3bytes
2519 'B' byte (12bit encoded value, of 8bit data)
2520 'A' address (36bit encoded value)
2521 'E' define entry as original address, and exit load
2523 The packets are processed in 4 character chunks, so the escape
2524 sequences that do not have any data (or variable length data)
2525 should be padded to a 4 character boundary. The decoder will give
2526 an error if the complete message block size is not a multiple of
2527 4bytes (size of record).
2529 The encoding of numbers is done in 6bit fields. The 6bit value is
2530 used to index into this string to get the specific character
2531 encoding for the value: */
2532 static char encoding
[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789,.";
2534 /* Convert the number of bits required into an encoded number, 6bits
2535 at a time (range 0..63). Keep a checksum if required (passed
2536 pointer non-NULL). The function returns the number of encoded
2537 characters written into the buffer. */
2539 pmon_makeb64 (v
, p
, n
, chksum
)
2545 int count
= (n
/ 6);
2547 if ((n
% 12) != 0) {
2548 fprintf_unfiltered(stderr
,"Fast encoding bitcount must be a multiple of 12bits: %dbit%s\n",n
,(n
== 1)?"":"s");
2552 fprintf_unfiltered(stderr
,"Fast encoding cannot process more than 36bits at the moment: %dbits\n",n
);
2556 /* Deal with the checksum: */
2557 if (chksum
!= NULL
) {
2559 case 36: *chksum
+= ((v
>> 24) & 0xFFF);
2560 case 24: *chksum
+= ((v
>> 12) & 0xFFF);
2561 case 12: *chksum
+= ((v
>> 0) & 0xFFF);
2567 *p
++ = encoding
[(v
>> n
) & 0x3F];
2573 /* Shorthand function (that could be in-lined) to output the zero-fill
2574 escape sequence into the data stream. */
2576 pmon_zeroset (recsize
, buff
, amount
, chksum
)
2580 unsigned int *chksum
;
2584 sprintf(*buff
,"/Z");
2585 count
= pmon_makeb64 (*amount
, (*buff
+ 2), 12, chksum
);
2586 *buff
+= (count
+ 2);
2588 return(recsize
+ count
+ 2);
2592 pmon_checkset (recsize
, buff
, value
)
2599 /* Add the checksum (without updating the value): */
2600 sprintf (*buff
, "/C");
2601 count
= pmon_makeb64 (*value
, (*buff
+ 2), 12, NULL
);
2602 *buff
+= (count
+ 2);
2603 sprintf (*buff
, "\015");
2604 *buff
+= 2; /* include zero terminator */
2605 /* Forcing a checksum validation clears the sum: */
2607 return(recsize
+ count
+ 3);
2610 /* Amount of padding we leave after at the end of the output buffer,
2611 for the checksum and line termination characters: */
2612 #define CHECKSIZE (4 + 4 + 4 + 2)
2613 /* zero-fill, checksum, transfer end and line termination space. */
2615 /* The amount of binary data loaded from the object file in a single
2617 #define BINCHUNK (1024)
2619 /* Maximum line of data accepted by the monitor: */
2620 #define MAXRECSIZE (550)
2621 /* NOTE: This constant depends on the monitor being used. This value
2622 is for PMON 5.x on the Cogent Vr4300 board. */
2625 pmon_make_fastrec (outbuf
, inbuf
, inptr
, inamount
, recsize
, csum
, zerofill
)
2627 unsigned char *inbuf
;
2632 unsigned int *zerofill
;
2637 /* This is a simple check to ensure that our data will fit within
2638 the maximum allowable record size. Each record output is 4bytes
2639 in length. We must allow space for a pending zero fill command,
2640 the record, and a checksum record. */
2641 while ((*recsize
< (MAXRECSIZE
- CHECKSIZE
)) && ((inamount
- *inptr
) > 0)) {
2642 /* Process the binary data: */
2643 if ((inamount
- *inptr
) < 3) {
2645 *recsize
= pmon_zeroset (*recsize
, &p
, zerofill
, csum
);
2647 count
= pmon_makeb64 (inbuf
[*inptr
], &p
[2], 12, csum
);
2649 *recsize
+= (2 + count
);
2652 unsigned int value
= ((inbuf
[*inptr
+ 0] << 16) | (inbuf
[*inptr
+ 1] << 8) | inbuf
[*inptr
+ 2]);
2653 /* Simple check for zero data. TODO: A better check would be
2654 to check the last, and then the middle byte for being zero
2655 (if the first byte is not). We could then check for
2656 following runs of zeros, and if above a certain size it is
2657 worth the 4 or 8 character hit of the byte insertions used
2658 to pad to the start of the zeroes. NOTE: This also depends
2659 on the alignment at the end of the zero run. */
2660 if (value
== 0x00000000) {
2662 if (*zerofill
== 0xFFF) /* 12bit counter */
2663 *recsize
= pmon_zeroset (*recsize
, &p
, zerofill
, csum
);
2666 *recsize
= pmon_zeroset (*recsize
, &p
, zerofill
, csum
);
2667 count
= pmon_makeb64 (value
, p
, 24, csum
);
2679 #if defined(DOETXACK)
2683 int c
= SERIAL_READCHAR (mips_desc
, 2);
2684 if ((c
== SERIAL_TIMEOUT
) || (c
!= 0x06)) {
2685 fprintf_unfiltered (gdb_stderr
, "Failed to receive valid ACK\n");
2686 return(-1); /* terminate the download */
2690 #endif /* DOETXACK */
2693 pmon_load_fast (file
)
2698 unsigned char *binbuf
;
2701 unsigned int csum
= 0;
2702 static int hashmark
= 1;
2707 buffer
= (char *)xmalloc(MAXRECSIZE
+ 1);
2708 binbuf
= (unsigned char *)xmalloc(BINCHUNK
);
2710 abfd
= bfd_openr(file
,0);
2713 printf_filtered ("Unable to open file %s\n",file
);
2717 if (bfd_check_format(abfd
,bfd_object
) == 0)
2719 printf_filtered("File is not an object file\n");
2723 /* Setup the required download state: */
2724 mips_send_command ("set dlproto etxack\015", -1);
2725 mips_send_command ("set dlecho off\015", -1);
2726 /* NOTE: We get a "cannot set variable" message if the variable is
2727 already defined to have the argument we give. The code doesn't
2728 care, since it just scans to the next prompt anyway. */
2729 /* Start the download: */
2730 mips_send_command (LOAD_CMD
, 0);
2731 mips_expect ("Downloading from tty0, ^C to abort\015\012");
2733 /* Zero the checksum */
2734 sprintf(buffer
,"/Kxx\015");
2735 reclen
= strlen(buffer
);
2736 SERIAL_WRITE (mips_desc
, buffer
, reclen
);
2738 #if defined(DOETXACK)
2739 finished
= pmon_check_ack();
2740 #endif /* DOETXACK */
2742 for (s
= abfd
->sections
; s
&& !finished
; s
= s
->next
)
2743 if (s
->flags
& SEC_LOAD
) /* only deal with loadable sections */
2745 bintotal
+= s
->_raw_size
;
2746 final
= (s
->vma
+ s
->_raw_size
);
2748 printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s
->name
, s
->vma
,
2749 s
->vma
+ s
->_raw_size
);
2750 gdb_flush (gdb_stdout
);
2752 /* Output the starting address */
2753 sprintf(buffer
,"/A");
2754 reclen
= pmon_makeb64(s
->vma
,&buffer
[2],36,&csum
);
2755 buffer
[2 + reclen
] = '\015';
2756 buffer
[3 + reclen
] = '\0';
2757 reclen
+= 3; /* for the initial escape code and carriage return */
2758 SERIAL_WRITE (mips_desc
, buffer
, reclen
);
2759 #if defined(DOETXACK)
2760 finished
= pmon_check_ack();
2761 #endif /* DOETXACK */
2766 unsigned int zerofill
= 0;
2772 for (i
= 0; ((i
< s
->_raw_size
) && !finished
); i
+= binamount
) {
2775 binamount
= min (BINCHUNK
, s
->_raw_size
- i
);
2777 bfd_get_section_contents (abfd
, s
, binbuf
, i
, binamount
);
2779 /* This keeps a rolling checksum, until we decide to output
2781 for (; ((binamount
- binptr
) > 0);) {
2782 pmon_make_fastrec (&bp
, binbuf
, &binptr
, binamount
, &reclen
, &csum
, &zerofill
);
2783 if (reclen
>= (MAXRECSIZE
- CHECKSIZE
)) {
2784 reclen
= pmon_checkset (reclen
, &bp
, &csum
);
2785 SERIAL_WRITE (mips_desc
, buffer
, reclen
);
2786 #if defined(DOETXACK)
2787 finished
= pmon_check_ack();
2789 zerofill
= 0; /* do not transmit pending zerofills */
2792 #endif /* DOETXACK */
2795 putchar_unfiltered ('#');
2796 gdb_flush (gdb_stdout
);
2800 reclen
= 0; /* buffer processed */
2805 /* Ensure no out-standing zerofill requests: */
2807 reclen
= pmon_zeroset (reclen
, &bp
, &zerofill
, &csum
);
2809 /* and then flush the line: */
2811 reclen
= pmon_checkset (reclen
, &bp
, &csum
);
2812 /* Currently pmon_checkset outputs the line terminator by
2813 default, so we write out the buffer so far: */
2814 SERIAL_WRITE (mips_desc
, buffer
, reclen
);
2815 #if defined(DOETXACK)
2816 finished
= pmon_check_ack();
2817 #endif /* DOETXACK */
2822 putchar_unfiltered ('\n');
2825 /* Terminate the transfer. We know that we have an empty output
2826 buffer at this point. */
2827 sprintf (buffer
, "/E/E\015"); /* include dummy padding characters */
2828 reclen
= strlen (buffer
);
2829 SERIAL_WRITE (mips_desc
, buffer
, reclen
);
2831 if (finished
) { /* Ignore the termination message: */
2832 SERIAL_FLUSH_INPUT (mips_desc
);
2833 } else { /* Deal with termination message: */
2834 char hexnumber
[9]; /* includes '\0' space */
2835 mips_expect ("Entry Address = ");
2836 sprintf(hexnumber
,"%x",final
);
2837 mips_expect (hexnumber
);
2838 #if defined(DOETXACK)
2839 mips_expect ("\015\012\006\015\012total = 0x");
2840 #else /* normal termination */
2841 mips_expect ("\015\012\015\012total = 0x");
2842 #endif /* !DOETXACK */
2843 sprintf(hexnumber
,"%x",bintotal
);
2844 mips_expect (hexnumber
);
2845 mips_expect (" bytes\015\012");
2851 /* mips_load -- download a file. */
2854 mips_load (file
, from_tty
)
2858 /* Get the board out of remote debugging mode. */
2859 if (mips_exit_debug ())
2860 error ("mips_load: Couldn't get into monitor mode.");
2862 if (mips_monitor
== MON_PMON
)
2863 pmon_load_fast (file
);
2865 mips_load_srec (file
);
2869 /* Finally, make the PC point at the start address */
2872 write_pc (bfd_get_start_address (exec_bfd
));
2874 inferior_pid
= 0; /* No process now */
2876 /* This is necessary because many things were based on the PC at the time that
2877 we attached to the monitor, which is no longer valid now that we have loaded
2878 new code (and just changed the PC). Another way to do this might be to call
2879 normal_stop, except that the stack may not be valid, and things would get
2880 horribly confused... */
2882 clear_symtab_users ();
2885 /* The target vector. */
2887 struct target_ops mips_ops
=
2889 "mips", /* to_shortname */
2890 "Remote MIPS debugging over serial line", /* to_longname */
2892 Debug a board using the MIPS remote debugging protocol over a serial line.\n\
2893 The argument is the device it is connected to or, if it contains a colon,\n\
2894 HOST:PORT to access a board over a network", /* to_doc */
2895 mips_open
, /* to_open */
2896 mips_close
, /* to_close */
2897 NULL
, /* to_attach */
2898 mips_detach
, /* to_detach */
2899 mips_resume
, /* to_resume */
2900 mips_wait
, /* to_wait */
2901 mips_fetch_registers
, /* to_fetch_registers */
2902 mips_store_registers
, /* to_store_registers */
2903 mips_prepare_to_store
, /* to_prepare_to_store */
2904 mips_xfer_memory
, /* to_xfer_memory */
2905 mips_files_info
, /* to_files_info */
2906 mips_insert_breakpoint
, /* to_insert_breakpoint */
2907 mips_remove_breakpoint
, /* to_remove_breakpoint */
2908 NULL
, /* to_terminal_init */
2909 NULL
, /* to_terminal_inferior */
2910 NULL
, /* to_terminal_ours_for_output */
2911 NULL
, /* to_terminal_ours */
2912 NULL
, /* to_terminal_info */
2913 mips_kill
, /* to_kill */
2914 mips_load
, /* to_load */
2915 NULL
, /* to_lookup_symbol */
2916 mips_create_inferior
, /* to_create_inferior */
2917 mips_mourn_inferior
, /* to_mourn_inferior */
2918 NULL
, /* to_can_run */
2919 NULL
, /* to_notice_signals */
2920 0, /* to_thread_alive */
2922 process_stratum
, /* to_stratum */
2924 1, /* to_has_all_memory */
2925 1, /* to_has_memory */
2926 1, /* to_has_stack */
2927 1, /* to_has_registers */
2928 1, /* to_has_execution */
2929 NULL
, /* sections */
2930 NULL
, /* sections_end */
2931 OPS_MAGIC
/* to_magic */
2934 /* An alternative target vector: */
2935 struct target_ops pmon_ops
=
2937 "pmon", /* to_shortname */
2938 "Remote MIPS debugging over serial line", /* to_longname */
2940 Debug a board using the PMON MIPS remote debugging protocol over a serial\n\
2941 line. The argument is the device it is connected to or, if it contains a\n\
2942 colon, HOST:PORT to access a board over a network", /* to_doc */
2943 pmon_open
, /* to_open */
2944 mips_close
, /* to_close */
2945 NULL
, /* to_attach */
2946 mips_detach
, /* to_detach */
2947 mips_resume
, /* to_resume */
2948 pmon_wait
, /* to_wait */
2949 mips_fetch_registers
, /* to_fetch_registers */
2950 mips_store_registers
, /* to_store_registers */
2951 mips_prepare_to_store
, /* to_prepare_to_store */
2952 mips_xfer_memory
, /* to_xfer_memory */
2953 mips_files_info
, /* to_files_info */
2954 mips_insert_breakpoint
, /* to_insert_breakpoint */
2955 mips_remove_breakpoint
, /* to_remove_breakpoint */
2956 NULL
, /* to_terminal_init */
2957 NULL
, /* to_terminal_inferior */
2958 NULL
, /* to_terminal_ours_for_output */
2959 NULL
, /* to_terminal_ours */
2960 NULL
, /* to_terminal_info */
2961 mips_kill
, /* to_kill */
2962 mips_load
, /* to_load */
2963 NULL
, /* to_lookup_symbol */
2964 mips_create_inferior
, /* to_create_inferior */
2965 mips_mourn_inferior
, /* to_mourn_inferior */
2966 NULL
, /* to_can_run */
2967 NULL
, /* to_notice_signals */
2968 0, /* to_thread_alive */
2970 process_stratum
, /* to_stratum */
2972 1, /* to_has_all_memory */
2973 1, /* to_has_memory */
2974 1, /* to_has_stack */
2975 1, /* to_has_registers */
2976 1, /* to_has_execution */
2977 NULL
, /* sections */
2978 NULL
, /* sections_end */
2979 OPS_MAGIC
/* to_magic */
2983 _initialize_remote_mips ()
2985 add_target (&mips_ops
);
2986 add_target (&pmon_ops
);
2989 add_set_cmd ("timeout", no_class
, var_zinteger
,
2990 (char *) &mips_receive_wait
,
2991 "Set timeout in seconds for remote MIPS serial I/O.",
2996 add_set_cmd ("retransmit-timeout", no_class
, var_zinteger
,
2997 (char *) &mips_retransmit_wait
,
2998 "Set retransmit timeout in seconds for remote MIPS serial I/O.\n\
2999 This is the number of seconds to wait for an acknowledgement to a packet\n\
3000 before resending the packet.", &setlist
),
3004 add_set_cmd ("syn-garbage-limit", no_class
, var_zinteger
,
3005 (char *) &mips_syn_garbage
,
3006 "Set the maximum number of characters to ignore when scanning for a SYN.\n\
3007 This is the maximum number of characters GDB will ignore when trying to\n\
3008 synchronize with the remote system. A value of -1 means that there is no limit\n\
3009 (Note that these characters are printed out even though they are ignored.)",