1 /* Remote debugging interface for MIPS remote debugging protocol.
2 Copyright 1993-1995, 2000 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,
21 Boston, MA 02111-1307, USA. */
32 #include "remote-utils.h"
33 #include "gdb_string.h"
36 #include <sys/types.h>
39 /* Microsoft C's stat.h doesn't define all the POSIX file modes. */
41 #define S_IROTH S_IREAD
46 /* Breakpoint types. Values 0, 1, and 2 must agree with the watch
47 types passed by breakpoint.c to target_insert_watchpoint.
48 Value 3 is our own invention, and is used for ordinary instruction
49 breakpoints. Value 4 is used to mark an unused watchpoint in tables. */
59 /* Prototypes for local functions. */
61 static int mips_readchar (int timeout
);
63 static int mips_receive_header (unsigned char *hdr
, int *pgarbage
,
66 static int mips_receive_trailer (unsigned char *trlr
, int *pgarbage
,
67 int *pch
, int timeout
);
69 static int mips_cksum (const unsigned char *hdr
,
70 const unsigned char *data
, int len
);
72 static void mips_send_packet (const char *s
, int get_ack
);
74 static void mips_send_command (const char *cmd
, int prompt
);
76 static int mips_receive_packet (char *buff
, int throw_error
, int timeout
);
78 static CORE_ADDR
mips_request (int cmd
, CORE_ADDR addr
,
79 CORE_ADDR data
, int *perr
, int timeout
,
82 static void mips_initialize (void);
84 static void mips_open (char *name
, int from_tty
);
86 static void pmon_open (char *name
, int from_tty
);
88 static void ddb_open (char *name
, int from_tty
);
90 static void lsi_open (char *name
, int from_tty
);
92 static void mips_close (int quitting
);
94 static void mips_detach (char *args
, int from_tty
);
96 static void mips_resume (int pid
, int step
, enum target_signal siggnal
);
98 static int mips_wait (int pid
, struct target_waitstatus
*status
);
100 static int mips_map_regno (int regno
);
102 static void mips_fetch_registers (int regno
);
104 static void mips_prepare_to_store (void);
106 static void mips_store_registers (int regno
);
108 static unsigned int mips_fetch_word (CORE_ADDR addr
);
110 static int mips_store_word (CORE_ADDR addr
, unsigned int value
,
113 static int mips_xfer_memory (CORE_ADDR memaddr
, char *myaddr
, int len
,
114 int write
, struct target_ops
*ignore
);
116 static void mips_files_info (struct target_ops
*ignore
);
118 static void mips_create_inferior (char *execfile
, char *args
, char **env
);
120 static void mips_mourn_inferior (void);
122 static int pmon_makeb64 (unsigned long v
, char *p
, int n
, int *chksum
);
124 static int pmon_zeroset (int recsize
, char **buff
, int *amount
,
125 unsigned int *chksum
);
127 static int pmon_checkset (int recsize
, char **buff
, int *value
);
129 static void pmon_make_fastrec (char **outbuf
, unsigned char *inbuf
,
130 int *inptr
, int inamount
, int *recsize
,
131 unsigned int *csum
, unsigned int *zerofill
);
133 static int pmon_check_ack (char *mesg
);
135 static void pmon_start_download (void);
137 static void pmon_end_download (int final
, int bintotal
);
139 static void pmon_download (char *buffer
, int length
);
141 static void pmon_load_fast (char *file
);
143 static void mips_load (char *file
, int from_tty
);
145 static int mips_make_srec (char *buffer
, int type
, CORE_ADDR memaddr
,
146 unsigned char *myaddr
, int len
);
148 static int set_breakpoint (CORE_ADDR addr
, int len
, enum break_type type
);
150 static int clear_breakpoint (CORE_ADDR addr
, int len
, enum break_type type
);
152 static int common_breakpoint (int set
, CORE_ADDR addr
, int len
,
153 enum break_type type
);
155 /* Forward declarations. */
156 extern struct target_ops mips_ops
;
157 extern struct target_ops pmon_ops
;
158 extern struct target_ops ddb_ops
;
160 /* The MIPS remote debugging interface is built on top of a simple
161 packet protocol. Each packet is organized as follows:
163 SYN The first character is always a SYN (ASCII 026, or ^V). SYN
164 may not appear anywhere else in the packet. Any time a SYN is
165 seen, a new packet should be assumed to have begun.
168 This byte contains the upper five bits of the logical length
169 of the data section, plus a single bit indicating whether this
170 is a data packet or an acknowledgement. The documentation
171 indicates that this bit is 1 for a data packet, but the actual
172 board uses 1 for an acknowledgement. The value of the byte is
173 0x40 + (ack ? 0x20 : 0) + (len >> 6)
174 (we always have 0 <= len < 1024). Acknowledgement packets do
175 not carry data, and must have a data length of 0.
177 LEN1 This byte contains the lower six bits of the logical length of
178 the data section. The value is
181 SEQ This byte contains the six bit sequence number of the packet.
184 An acknowlegment packet contains the sequence number of the
185 packet being acknowledged plus 1 modulo 64. Data packets are
186 transmitted in sequence. There may only be one outstanding
187 unacknowledged data packet at a time. The sequence numbers
188 are independent in each direction. If an acknowledgement for
189 the previous packet is received (i.e., an acknowledgement with
190 the sequence number of the packet just sent) the packet just
191 sent should be retransmitted. If no acknowledgement is
192 received within a timeout period, the packet should be
193 retransmitted. This has an unfortunate failure condition on a
194 high-latency line, as a delayed acknowledgement may lead to an
195 endless series of duplicate packets.
197 DATA The actual data bytes follow. The following characters are
198 escaped inline with DLE (ASCII 020, or ^P):
204 The additional DLE characters are not counted in the logical
205 length stored in the TYPE_LEN and LEN1 bytes.
210 These bytes contain an 18 bit checksum of the complete
211 contents of the packet excluding the SEQ byte and the
212 CSUM[123] bytes. The checksum is simply the twos complement
213 addition of all the bytes treated as unsigned characters. The
214 values of the checksum bytes are:
215 CSUM1: 0x40 + ((cksum >> 12) & 0x3f)
216 CSUM2: 0x40 + ((cksum >> 6) & 0x3f)
217 CSUM3: 0x40 + (cksum & 0x3f)
219 It happens that the MIPS remote debugging protocol always
220 communicates with ASCII strings. Because of this, this
221 implementation doesn't bother to handle the DLE quoting mechanism,
222 since it will never be required. */
226 /* The SYN character which starts each packet. */
229 /* The 0x40 used to offset each packet (this value ensures that all of
230 the header and trailer bytes, other than SYN, are printable ASCII
232 #define HDR_OFFSET 0x40
234 /* The indices of the bytes in the packet header. */
235 #define HDR_INDX_SYN 0
236 #define HDR_INDX_TYPE_LEN 1
237 #define HDR_INDX_LEN1 2
238 #define HDR_INDX_SEQ 3
241 /* The data/ack bit in the TYPE_LEN header byte. */
242 #define TYPE_LEN_DA_BIT 0x20
243 #define TYPE_LEN_DATA 0
244 #define TYPE_LEN_ACK TYPE_LEN_DA_BIT
246 /* How to compute the header bytes. */
247 #define HDR_SET_SYN(data, len, seq) (SYN)
248 #define HDR_SET_TYPE_LEN(data, len, seq) \
250 + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \
251 + (((len) >> 6) & 0x1f))
252 #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f))
253 #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq))
255 /* Check that a header byte is reasonable. */
256 #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET)
258 /* Get data from the header. These macros evaluate their argument
260 #define HDR_IS_DATA(hdr) \
261 (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA)
262 #define HDR_GET_LEN(hdr) \
263 ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f)))
264 #define HDR_GET_SEQ(hdr) ((unsigned int)(hdr)[HDR_INDX_SEQ] & 0x3f)
266 /* The maximum data length. */
267 #define DATA_MAXLEN 1023
269 /* The trailer offset. */
270 #define TRLR_OFFSET HDR_OFFSET
272 /* The indices of the bytes in the packet trailer. */
273 #define TRLR_INDX_CSUM1 0
274 #define TRLR_INDX_CSUM2 1
275 #define TRLR_INDX_CSUM3 2
276 #define TRLR_LENGTH 3
278 /* How to compute the trailer bytes. */
279 #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f))
280 #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f))
281 #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f))
283 /* Check that a trailer byte is reasonable. */
284 #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET)
286 /* Get data from the trailer. This evaluates its argument multiple
288 #define TRLR_GET_CKSUM(trlr) \
289 ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \
290 + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \
291 + ((trlr)[TRLR_INDX_CSUM3] & 0x3f))
293 /* The sequence number modulos. */
294 #define SEQ_MODULOS (64)
296 /* PMON commands to load from the serial port or UDP socket. */
297 #define LOAD_CMD "load -b -s tty0\r"
298 #define LOAD_CMD_UDP "load -b -s udp\r"
300 /* The target vectors for the four different remote MIPS targets.
301 These are initialized with code in _initialize_remote_mips instead
302 of static initializers, to make it easier to extend the target_ops
304 struct target_ops mips_ops
, pmon_ops
, ddb_ops
, lsi_ops
;
306 enum mips_monitor_type
308 /* IDT/SIM monitor being used: */
310 /* PMON monitor being used: */
311 MON_PMON
, /* 3.0.83 [COGENT,EB,FP,NET] Algorithmics Ltd. Nov 9 1995 17:19:50 */
312 MON_DDB
, /* 2.7.473 [DDBVR4300,EL,FP,NET] Risq Modular Systems, Thu Jun 6 09:28:40 PDT 1996 */
313 MON_LSI
, /* 4.3.12 [EB,FP], LSI LOGIC Corp. Tue Feb 25 13:22:14 1997 */
314 /* Last and unused value, for sizing vectors, etc. */
317 static enum mips_monitor_type mips_monitor
= MON_LAST
;
319 /* The monitor prompt text. If the user sets the PMON prompt
320 to some new value, the GDB `set monitor-prompt' command must also
321 be used to inform GDB about the expected prompt. Otherwise, GDB
322 will not be able to connect to PMON in mips_initialize().
323 If the `set monitor-prompt' command is not used, the expected
324 default prompt will be set according the target:
331 static char *mips_monitor_prompt
;
333 /* Set to 1 if the target is open. */
334 static int mips_is_open
;
336 /* Currently active target description (if mips_is_open == 1) */
337 static struct target_ops
*current_ops
;
339 /* Set to 1 while the connection is being initialized. */
340 static int mips_initializing
;
342 /* Set to 1 while the connection is being brought down. */
343 static int mips_exiting
;
345 /* The next sequence number to send. */
346 static unsigned int mips_send_seq
;
348 /* The next sequence number we expect to receive. */
349 static unsigned int mips_receive_seq
;
351 /* The time to wait before retransmitting a packet, in seconds. */
352 static int mips_retransmit_wait
= 3;
354 /* The number of times to try retransmitting a packet before giving up. */
355 static int mips_send_retries
= 10;
357 /* The number of garbage characters to accept when looking for an
358 SYN for the next packet. */
359 static int mips_syn_garbage
= 1050;
361 /* The time to wait for a packet, in seconds. */
362 static int mips_receive_wait
= 5;
364 /* Set if we have sent a packet to the board but have not yet received
366 static int mips_need_reply
= 0;
368 /* Handle used to access serial I/O stream. */
369 static serial_t mips_desc
;
371 /* UDP handle used to download files to target. */
372 static serial_t udp_desc
;
373 static int udp_in_use
;
375 /* TFTP filename used to download files to DDB board, in the form
377 static char *tftp_name
; /* host:filename */
378 static char *tftp_localname
; /* filename portion of above */
379 static int tftp_in_use
;
380 static FILE *tftp_file
;
382 /* Counts the number of times the user tried to interrupt the target (usually
384 static int interrupt_count
;
386 /* If non-zero, means that the target is running. */
387 static int mips_wait_flag
= 0;
389 /* If non-zero, monitor supports breakpoint commands. */
390 static int monitor_supports_breakpoints
= 0;
392 /* Data cache header. */
394 #if 0 /* not used (yet?) */
395 static DCACHE
*mips_dcache
;
398 /* Non-zero means that we've just hit a read or write watchpoint */
399 static int hit_watchpoint
;
401 /* Table of breakpoints/watchpoints (used only on LSI PMON target).
402 The table is indexed by a breakpoint number, which is an integer
403 from 0 to 255 returned by the LSI PMON when a breakpoint is set.
405 #define MAX_LSI_BREAKPOINTS 256
406 struct lsi_breakpoint_info
408 enum break_type type
; /* type of breakpoint */
409 CORE_ADDR addr
; /* address of breakpoint */
410 int len
; /* length of region being watched */
411 unsigned long value
; /* value to watch */
413 lsi_breakpoints
[MAX_LSI_BREAKPOINTS
];
415 /* Error/warning codes returned by LSI PMON for breakpoint commands.
416 Warning values may be ORed together; error values may not. */
417 #define W_WARN 0x100 /* This bit is set if the error code is a warning */
418 #define W_MSK 0x101 /* warning: Range feature is supported via mask */
419 #define W_VAL 0x102 /* warning: Value check is not supported in hardware */
420 #define W_QAL 0x104 /* warning: Requested qualifiers are not supported in hardware */
422 #define E_ERR 0x200 /* This bit is set if the error code is an error */
423 #define E_BPT 0x200 /* error: No such breakpoint number */
424 #define E_RGE 0x201 /* error: Range is not supported */
425 #define E_QAL 0x202 /* error: The requested qualifiers can not be used */
426 #define E_OUT 0x203 /* error: Out of hardware resources */
427 #define E_NON 0x204 /* error: Hardware breakpoint not supported */
431 int code
; /* error code */
432 char *string
; /* string associated with this code */
435 struct lsi_error lsi_warning_table
[] =
437 {W_MSK
, "Range feature is supported via mask"},
438 {W_VAL
, "Value check is not supported in hardware"},
439 {W_QAL
, "Requested qualifiers are not supported in hardware"},
443 struct lsi_error lsi_error_table
[] =
445 {E_BPT
, "No such breakpoint number"},
446 {E_RGE
, "Range is not supported"},
447 {E_QAL
, "The requested qualifiers can not be used"},
448 {E_OUT
, "Out of hardware resources"},
449 {E_NON
, "Hardware breakpoint not supported"},
453 /* Set to 1 with the 'set monitor-warnings' command to enable printing
454 of warnings returned by PMON when hardware breakpoints are used. */
455 static int monitor_warnings
;
462 SERIAL_CLOSE (mips_desc
);
466 SERIAL_CLOSE (udp_desc
);
472 /* Handle low-level error that we can't recover from. Note that just
473 error()ing out from target_wait or some such low-level place will cause
474 all hell to break loose--the rest of GDB will tend to get left in an
475 inconsistent state. */
478 mips_error (char *string
,...)
482 va_start (args
, string
);
484 target_terminal_ours ();
485 wrap_here (""); /* Force out any buffered output */
486 gdb_flush (gdb_stdout
);
488 fprintf_filtered (gdb_stderr
, error_pre_print
);
489 vfprintf_filtered (gdb_stderr
, string
, args
);
490 fprintf_filtered (gdb_stderr
, "\n");
492 gdb_flush (gdb_stderr
);
494 /* Clean up in such a way that mips_close won't try to talk to the
495 board (it almost surely won't work since we weren't able to talk to
499 printf_unfiltered ("Ending remote MIPS debugging.\n");
500 target_mourn_inferior ();
502 return_to_top_level (RETURN_ERROR
);
505 /* putc_readable - print a character, displaying non-printable chars in
506 ^x notation or in hex. */
509 fputc_readable (ch
, file
)
511 struct ui_file
*file
;
514 fputc_unfiltered ('\n', file
);
516 fprintf_unfiltered (file
, "\\r");
517 else if (ch
< 0x20) /* ASCII control character */
518 fprintf_unfiltered (file
, "^%c", ch
+ '@');
519 else if (ch
>= 0x7f) /* non-ASCII characters (rubout or greater) */
520 fprintf_unfiltered (file
, "[%02x]", ch
& 0xff);
522 fputc_unfiltered (ch
, file
);
526 /* puts_readable - print a string, displaying non-printable chars in
527 ^x notation or in hex. */
530 fputs_readable (string
, file
)
532 struct ui_file
*file
;
536 while ((c
= *string
++) != '\0')
537 fputc_readable (c
, file
);
541 /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if
542 timed out. TIMEOUT specifies timeout value in seconds.
546 mips_expect_timeout (string
, timeout
)
554 fprintf_unfiltered (gdb_stdlog
, "Expected \"");
555 fputs_readable (string
, gdb_stdlog
);
556 fprintf_unfiltered (gdb_stdlog
, "\", got \"");
564 /* Must use SERIAL_READCHAR here cuz mips_readchar would get confused if we
565 were waiting for the mips_monitor_prompt... */
567 c
= SERIAL_READCHAR (mips_desc
, timeout
);
569 if (c
== SERIAL_TIMEOUT
)
572 fprintf_unfiltered (gdb_stdlog
, "\": FAIL\n");
577 fputc_readable (c
, gdb_stdlog
);
585 fprintf_unfiltered (gdb_stdlog
, "\": OK\n");
598 /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if
599 timed out. The timeout value is hard-coded to 2 seconds. Use
600 mips_expect_timeout if a different timeout value is needed.
607 return mips_expect_timeout (string
, 2);
610 /* Read the required number of characters into the given buffer (which
611 is assumed to be large enough). The only failure is a timeout. */
613 mips_getstring (string
, n
)
623 c
= SERIAL_READCHAR (mips_desc
, 2);
625 if (c
== SERIAL_TIMEOUT
)
627 fprintf_unfiltered (gdb_stderr
,
628 "Failed to read %d characters from target (TIMEOUT)\n", n
);
639 /* Read a character from the remote, aborting on error. Returns
640 SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR
641 returns). FIXME: If we see the string mips_monitor_prompt from
642 the board, then we are debugging on the main console port, and we
643 have somehow dropped out of remote debugging mode. In this case,
644 we automatically go back in to remote debugging mode. This is a
645 hack, put in because I can't find any way for a program running on
646 the remote board to terminate without also ending remote debugging
647 mode. I assume users won't have any trouble with this; for one
648 thing, the IDT documentation generally assumes that the remote
649 debugging port is not the console port. This is, however, very
650 convenient for DejaGnu when you only have one connected serial
654 mips_readchar (timeout
)
658 static int state
= 0;
659 int mips_monitor_prompt_len
= strlen (mips_monitor_prompt
);
665 if (i
== -1 && watchdog
> 0)
669 if (state
== mips_monitor_prompt_len
)
671 ch
= SERIAL_READCHAR (mips_desc
, timeout
);
673 if (ch
== SERIAL_TIMEOUT
&& timeout
== -1) /* Watchdog went off */
675 target_mourn_inferior ();
676 error ("Watchdog has expired. Target detached.\n");
679 if (ch
== SERIAL_EOF
)
680 mips_error ("End of file from remote");
681 if (ch
== SERIAL_ERROR
)
682 mips_error ("Error reading from remote: %s", safe_strerror (errno
));
683 if (remote_debug
> 1)
685 /* Don't use _filtered; we can't deal with a QUIT out of
686 target_wait, and I think this might be called from there. */
687 if (ch
!= SERIAL_TIMEOUT
)
688 fprintf_unfiltered (gdb_stdlog
, "Read '%c' %d 0x%x\n", ch
, ch
, ch
);
690 fprintf_unfiltered (gdb_stdlog
, "Timed out in read\n");
693 /* If we have seen mips_monitor_prompt and we either time out, or
694 we see a @ (which was echoed from a packet we sent), reset the
695 board as described above. The first character in a packet after
696 the SYN (which is not echoed) is always an @ unless the packet is
697 more than 64 characters long, which ours never are. */
698 if ((ch
== SERIAL_TIMEOUT
|| ch
== '@')
699 && state
== mips_monitor_prompt_len
700 && !mips_initializing
703 if (remote_debug
> 0)
704 /* Don't use _filtered; we can't deal with a QUIT out of
705 target_wait, and I think this might be called from there. */
706 fprintf_unfiltered (gdb_stdlog
, "Reinitializing MIPS debugging mode\n");
713 /* At this point, about the only thing we can do is abort the command
714 in progress and get back to command level as quickly as possible. */
716 error ("Remote board reset, debug protocol re-initialized.");
719 if (ch
== mips_monitor_prompt
[state
])
727 /* Get a packet header, putting the data in the supplied buffer.
728 PGARBAGE is a pointer to the number of garbage characters received
729 so far. CH is the last character received. Returns 0 for success,
730 or -1 for timeout. */
733 mips_receive_header (hdr
, pgarbage
, ch
, timeout
)
743 /* Wait for a SYN. mips_syn_garbage is intended to prevent
744 sitting here indefinitely if the board sends us one garbage
745 character per second. ch may already have a value from the
746 last time through the loop. */
749 ch
= mips_readchar (timeout
);
750 if (ch
== SERIAL_TIMEOUT
)
754 /* Printing the character here lets the user of gdb see
755 what the program is outputting, if the debugging is
756 being done on the console port. Don't use _filtered;
757 we can't deal with a QUIT out of target_wait. */
758 if (!mips_initializing
|| remote_debug
> 0)
760 fputc_readable (ch
, gdb_stdlog
);
761 gdb_flush (gdb_stdlog
);
765 if (mips_syn_garbage
> 0
766 && *pgarbage
> mips_syn_garbage
)
767 mips_error ("Debug protocol failure: more than %d characters before a sync.",
772 /* Get the packet header following the SYN. */
773 for (i
= 1; i
< HDR_LENGTH
; i
++)
775 ch
= mips_readchar (timeout
);
776 if (ch
== SERIAL_TIMEOUT
)
778 /* Make sure this is a header byte. */
779 if (ch
== SYN
|| !HDR_CHECK (ch
))
785 /* If we got the complete header, we can return. Otherwise we
786 loop around and keep looking for SYN. */
792 /* Get a packet header, putting the data in the supplied buffer.
793 PGARBAGE is a pointer to the number of garbage characters received
794 so far. The last character read is returned in *PCH. Returns 0
795 for success, -1 for timeout, -2 for error. */
798 mips_receive_trailer (trlr
, pgarbage
, pch
, timeout
)
807 for (i
= 0; i
< TRLR_LENGTH
; i
++)
809 ch
= mips_readchar (timeout
);
811 if (ch
== SERIAL_TIMEOUT
)
813 if (!TRLR_CHECK (ch
))
820 /* Get the checksum of a packet. HDR points to the packet header.
821 DATA points to the packet data. LEN is the length of DATA. */
824 mips_cksum (hdr
, data
, len
)
825 const unsigned char *hdr
;
826 const unsigned char *data
;
829 register const unsigned char *p
;
835 /* The initial SYN is not included in the checksum. */
849 /* Send a packet containing the given ASCII string. */
852 mips_send_packet (s
, get_ack
)
856 /* unsigned */ int len
;
857 unsigned char *packet
;
862 if (len
> DATA_MAXLEN
)
863 mips_error ("MIPS protocol data packet too long: %s", s
);
865 packet
= (unsigned char *) alloca (HDR_LENGTH
+ len
+ TRLR_LENGTH
+ 1);
867 packet
[HDR_INDX_SYN
] = HDR_SET_SYN (1, len
, mips_send_seq
);
868 packet
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (1, len
, mips_send_seq
);
869 packet
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (1, len
, mips_send_seq
);
870 packet
[HDR_INDX_SEQ
] = HDR_SET_SEQ (1, len
, mips_send_seq
);
872 memcpy (packet
+ HDR_LENGTH
, s
, len
);
874 cksum
= mips_cksum (packet
, packet
+ HDR_LENGTH
, len
);
875 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
876 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
877 packet
[HDR_LENGTH
+ len
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
879 /* Increment the sequence number. This will set mips_send_seq to
880 the sequence number we expect in the acknowledgement. */
881 mips_send_seq
= (mips_send_seq
+ 1) % SEQ_MODULOS
;
883 /* We can only have one outstanding data packet, so we just wait for
884 the acknowledgement here. Keep retransmitting the packet until
885 we get one, or until we've tried too many times. */
886 for (try = 0; try < mips_send_retries
; try++)
891 if (remote_debug
> 0)
893 /* Don't use _filtered; we can't deal with a QUIT out of
894 target_wait, and I think this might be called from there. */
895 packet
[HDR_LENGTH
+ len
+ TRLR_LENGTH
] = '\0';
896 fprintf_unfiltered (gdb_stdlog
, "Writing \"%s\"\n", packet
+ 1);
899 if (SERIAL_WRITE (mips_desc
, packet
,
900 HDR_LENGTH
+ len
+ TRLR_LENGTH
) != 0)
901 mips_error ("write to target failed: %s", safe_strerror (errno
));
910 unsigned char hdr
[HDR_LENGTH
+ 1];
911 unsigned char trlr
[TRLR_LENGTH
+ 1];
915 /* Get the packet header. If we time out, resend the data
917 err
= mips_receive_header (hdr
, &garbage
, ch
, mips_retransmit_wait
);
923 /* If we get a data packet, assume it is a duplicate and
924 ignore it. FIXME: If the acknowledgement is lost, this
925 data packet may be the packet the remote sends after the
927 if (HDR_IS_DATA (hdr
))
931 /* Ignore any errors raised whilst attempting to ignore
934 len
= HDR_GET_LEN (hdr
);
936 for (i
= 0; i
< len
; i
++)
940 rch
= mips_readchar (2);
946 if (rch
== SERIAL_TIMEOUT
)
948 /* ignore the character */
952 (void) mips_receive_trailer (trlr
, &garbage
, &ch
, 2);
954 /* We don't bother checking the checksum, or providing an
955 ACK to the packet. */
959 /* If the length is not 0, this is a garbled packet. */
960 if (HDR_GET_LEN (hdr
) != 0)
963 /* Get the packet trailer. */
964 err
= mips_receive_trailer (trlr
, &garbage
, &ch
,
965 mips_retransmit_wait
);
967 /* If we timed out, resend the data packet. */
971 /* If we got a bad character, reread the header. */
975 /* If the checksum does not match the trailer checksum, this
976 is a bad packet; ignore it. */
977 if (mips_cksum (hdr
, (unsigned char *) NULL
, 0)
978 != TRLR_GET_CKSUM (trlr
))
981 if (remote_debug
> 0)
983 hdr
[HDR_LENGTH
] = '\0';
984 trlr
[TRLR_LENGTH
] = '\0';
985 /* Don't use _filtered; we can't deal with a QUIT out of
986 target_wait, and I think this might be called from there. */
987 fprintf_unfiltered (gdb_stdlog
, "Got ack %d \"%s%s\"\n",
988 HDR_GET_SEQ (hdr
), hdr
+ 1, trlr
);
991 /* If this ack is for the current packet, we're done. */
992 seq
= HDR_GET_SEQ (hdr
);
993 if (seq
== mips_send_seq
)
996 /* If this ack is for the last packet, resend the current
998 if ((seq
+ 1) % SEQ_MODULOS
== mips_send_seq
)
1001 /* Otherwise this is a bad ack; ignore it. Increment the
1002 garbage count to ensure that we do not stay in this loop
1008 mips_error ("Remote did not acknowledge packet");
1011 /* Receive and acknowledge a packet, returning the data in BUFF (which
1012 should be DATA_MAXLEN + 1 bytes). The protocol documentation
1013 implies that only the sender retransmits packets, so this code just
1014 waits silently for a packet. It returns the length of the received
1015 packet. If THROW_ERROR is nonzero, call error() on errors. If not,
1016 don't print an error message and return -1. */
1019 mips_receive_packet (buff
, throw_error
, timeout
)
1027 unsigned char ack
[HDR_LENGTH
+ TRLR_LENGTH
+ 1];
1034 unsigned char hdr
[HDR_LENGTH
];
1035 unsigned char trlr
[TRLR_LENGTH
];
1039 if (mips_receive_header (hdr
, &garbage
, ch
, timeout
) != 0)
1042 mips_error ("Timed out waiting for remote packet");
1049 /* An acknowledgement is probably a duplicate; ignore it. */
1050 if (!HDR_IS_DATA (hdr
))
1052 len
= HDR_GET_LEN (hdr
);
1053 /* Check if the length is valid for an ACK, we may aswell
1054 try and read the remainder of the packet: */
1057 /* Ignore the error condition, since we are going to
1058 ignore the packet anyway. */
1059 (void) mips_receive_trailer (trlr
, &garbage
, &ch
, timeout
);
1061 /* Don't use _filtered; we can't deal with a QUIT out of
1062 target_wait, and I think this might be called from there. */
1063 if (remote_debug
> 0)
1064 fprintf_unfiltered (gdb_stdlog
, "Ignoring unexpected ACK\n");
1068 len
= HDR_GET_LEN (hdr
);
1069 for (i
= 0; i
< len
; i
++)
1073 rch
= mips_readchar (timeout
);
1079 if (rch
== SERIAL_TIMEOUT
)
1082 mips_error ("Timed out waiting for remote packet");
1091 /* Don't use _filtered; we can't deal with a QUIT out of
1092 target_wait, and I think this might be called from there. */
1093 if (remote_debug
> 0)
1094 fprintf_unfiltered (gdb_stdlog
,
1095 "Got new SYN after %d chars (wanted %d)\n",
1100 err
= mips_receive_trailer (trlr
, &garbage
, &ch
, timeout
);
1104 mips_error ("Timed out waiting for packet");
1110 /* Don't use _filtered; we can't deal with a QUIT out of
1111 target_wait, and I think this might be called from there. */
1112 if (remote_debug
> 0)
1113 fprintf_unfiltered (gdb_stdlog
, "Got SYN when wanted trailer\n");
1117 /* If this is the wrong sequence number, ignore it. */
1118 if (HDR_GET_SEQ (hdr
) != mips_receive_seq
)
1120 /* Don't use _filtered; we can't deal with a QUIT out of
1121 target_wait, and I think this might be called from there. */
1122 if (remote_debug
> 0)
1123 fprintf_unfiltered (gdb_stdlog
,
1124 "Ignoring sequence number %d (want %d)\n",
1125 HDR_GET_SEQ (hdr
), mips_receive_seq
);
1129 if (mips_cksum (hdr
, buff
, len
) == TRLR_GET_CKSUM (trlr
))
1132 if (remote_debug
> 0)
1133 /* Don't use _filtered; we can't deal with a QUIT out of
1134 target_wait, and I think this might be called from there. */
1135 printf_unfiltered ("Bad checksum; data %d, trailer %d\n",
1136 mips_cksum (hdr
, buff
, len
),
1137 TRLR_GET_CKSUM (trlr
));
1139 /* The checksum failed. Send an acknowledgement for the
1140 previous packet to tell the remote to resend the packet. */
1141 ack
[HDR_INDX_SYN
] = HDR_SET_SYN (0, 0, mips_receive_seq
);
1142 ack
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq
);
1143 ack
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (0, 0, mips_receive_seq
);
1144 ack
[HDR_INDX_SEQ
] = HDR_SET_SEQ (0, 0, mips_receive_seq
);
1146 cksum
= mips_cksum (ack
, (unsigned char *) NULL
, 0);
1148 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
1149 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
1150 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
1152 if (remote_debug
> 0)
1154 ack
[HDR_LENGTH
+ TRLR_LENGTH
] = '\0';
1155 /* Don't use _filtered; we can't deal with a QUIT out of
1156 target_wait, and I think this might be called from there. */
1157 printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq
,
1161 if (SERIAL_WRITE (mips_desc
, ack
, HDR_LENGTH
+ TRLR_LENGTH
) != 0)
1164 mips_error ("write to target failed: %s", safe_strerror (errno
));
1170 if (remote_debug
> 0)
1173 /* Don't use _filtered; we can't deal with a QUIT out of
1174 target_wait, and I think this might be called from there. */
1175 printf_unfiltered ("Got packet \"%s\"\n", buff
);
1178 /* We got the packet. Send an acknowledgement. */
1179 mips_receive_seq
= (mips_receive_seq
+ 1) % SEQ_MODULOS
;
1181 ack
[HDR_INDX_SYN
] = HDR_SET_SYN (0, 0, mips_receive_seq
);
1182 ack
[HDR_INDX_TYPE_LEN
] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq
);
1183 ack
[HDR_INDX_LEN1
] = HDR_SET_LEN1 (0, 0, mips_receive_seq
);
1184 ack
[HDR_INDX_SEQ
] = HDR_SET_SEQ (0, 0, mips_receive_seq
);
1186 cksum
= mips_cksum (ack
, (unsigned char *) NULL
, 0);
1188 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM1
] = TRLR_SET_CSUM1 (cksum
);
1189 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM2
] = TRLR_SET_CSUM2 (cksum
);
1190 ack
[HDR_LENGTH
+ TRLR_INDX_CSUM3
] = TRLR_SET_CSUM3 (cksum
);
1192 if (remote_debug
> 0)
1194 ack
[HDR_LENGTH
+ TRLR_LENGTH
] = '\0';
1195 /* Don't use _filtered; we can't deal with a QUIT out of
1196 target_wait, and I think this might be called from there. */
1197 printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq
,
1201 if (SERIAL_WRITE (mips_desc
, ack
, HDR_LENGTH
+ TRLR_LENGTH
) != 0)
1204 mips_error ("write to target failed: %s", safe_strerror (errno
));
1212 /* Optionally send a request to the remote system and optionally wait
1213 for the reply. This implements the remote debugging protocol,
1214 which is built on top of the packet protocol defined above. Each
1215 request has an ADDR argument and a DATA argument. The following
1216 requests are defined:
1218 \0 don't send a request; just wait for a reply
1219 i read word from instruction space at ADDR
1220 d read word from data space at ADDR
1221 I write DATA to instruction space at ADDR
1222 D write DATA to data space at ADDR
1223 r read register number ADDR
1224 R set register number ADDR to value DATA
1225 c continue execution (if ADDR != 1, set pc to ADDR)
1226 s single step (if ADDR != 1, set pc to ADDR)
1228 The read requests return the value requested. The write requests
1229 return the previous value in the changed location. The execution
1230 requests return a UNIX wait value (the approximate signal which
1231 caused execution to stop is in the upper eight bits).
1233 If PERR is not NULL, this function waits for a reply. If an error
1234 occurs, it sets *PERR to 1 and sets errno according to what the
1235 target board reports. */
1238 mips_request (cmd
, addr
, data
, perr
, timeout
, buff
)
1246 char myBuff
[DATA_MAXLEN
+ 1];
1251 unsigned long rresponse
;
1253 if (buff
== (char *) NULL
)
1258 if (mips_need_reply
)
1259 internal_error ("mips_request: Trying to send command before reply");
1260 sprintf (buff
, "0x0 %c 0x%s 0x%s", cmd
, paddr_nz (addr
), paddr_nz (data
));
1261 mips_send_packet (buff
, 1);
1262 mips_need_reply
= 1;
1265 if (perr
== (int *) NULL
)
1268 if (!mips_need_reply
)
1269 internal_error ("mips_request: Trying to get reply before command");
1271 mips_need_reply
= 0;
1273 len
= mips_receive_packet (buff
, 1, timeout
);
1276 if (sscanf (buff
, "0x%x %c 0x%x 0x%lx",
1277 &rpid
, &rcmd
, &rerrflg
, &rresponse
) != 4
1278 || (cmd
!= '\0' && rcmd
!= cmd
))
1279 mips_error ("Bad response from remote board");
1285 /* FIXME: This will returns MIPS errno numbers, which may or may
1286 not be the same as errno values used on other systems. If
1287 they stick to common errno values, they will be the same, but
1288 if they don't, they must be translated. */
1299 mips_initialize_cleanups (arg
)
1302 mips_initializing
= 0;
1306 mips_exit_cleanups (arg
)
1313 mips_send_command (cmd
, prompt
)
1317 SERIAL_WRITE (mips_desc
, cmd
, strlen (cmd
));
1321 mips_expect (mips_monitor_prompt
);
1324 /* Enter remote (dbx) debug mode: */
1328 /* Reset the sequence numbers, ready for the new debug sequence: */
1330 mips_receive_seq
= 0;
1332 if (mips_monitor
!= MON_IDT
)
1333 mips_send_command ("debug\r", 0);
1334 else /* assume IDT monitor by default */
1335 mips_send_command ("db tty0\r", 0);
1338 SERIAL_WRITE (mips_desc
, "\r", sizeof "\r" - 1);
1340 /* We don't need to absorb any spurious characters here, since the
1341 mips_receive_header will eat up a reasonable number of characters
1342 whilst looking for the SYN, however this avoids the "garbage"
1343 being displayed to the user. */
1344 if (mips_monitor
!= MON_IDT
)
1348 char buff
[DATA_MAXLEN
+ 1];
1349 if (mips_receive_packet (buff
, 1, 3) < 0)
1350 mips_error ("Failed to initialize (didn't receive packet).");
1354 /* Exit remote (dbx) debug mode, returning to the monitor prompt: */
1359 struct cleanup
*old_cleanups
= make_cleanup (mips_exit_cleanups
, NULL
);
1363 if (mips_monitor
!= MON_IDT
)
1365 /* The DDB (NEC) and MiniRISC (LSI) versions of PMON exit immediately,
1366 so we do not get a reply to this command: */
1367 mips_request ('x', (unsigned int) 0, (unsigned int) 0, NULL
,
1368 mips_receive_wait
, NULL
);
1369 mips_need_reply
= 0;
1370 if (!mips_expect (" break!"))
1374 mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err
,
1375 mips_receive_wait
, NULL
);
1377 if (!mips_expect (mips_monitor_prompt
))
1380 do_cleanups (old_cleanups
);
1385 /* Initialize a new connection to the MIPS board, and make sure we are
1386 really connected. */
1392 struct cleanup
*old_cleanups
= make_cleanup (mips_initialize_cleanups
, NULL
);
1395 /* What is this code doing here? I don't see any way it can happen, and
1396 it might mean mips_initializing didn't get cleared properly.
1397 So I'll make it a warning. */
1399 if (mips_initializing
)
1401 warning ("internal error: mips_initialize called twice");
1406 mips_initializing
= 1;
1408 /* At this point, the packit protocol isn't responding. We'll try getting
1409 into the monitor, and restarting the protocol. */
1411 /* Force the system into the monitor. After this we *should* be at
1412 the mips_monitor_prompt. */
1413 if (mips_monitor
!= MON_IDT
)
1414 j
= 0; /* start by checking if we are already at the prompt */
1416 j
= 1; /* start by sending a break */
1421 case 0: /* First, try sending a CR */
1422 SERIAL_FLUSH_INPUT (mips_desc
);
1423 SERIAL_WRITE (mips_desc
, "\r", 1);
1425 case 1: /* First, try sending a break */
1426 SERIAL_SEND_BREAK (mips_desc
);
1428 case 2: /* Then, try a ^C */
1429 SERIAL_WRITE (mips_desc
, "\003", 1);
1431 case 3: /* Then, try escaping from download */
1433 if (mips_monitor
!= MON_IDT
)
1437 /* We shouldn't need to send multiple termination
1438 sequences, since the target performs line (or
1439 block) reads, and then processes those
1440 packets. In-case we were downloading a large packet
1441 we flush the output buffer before inserting a
1442 termination sequence. */
1443 SERIAL_FLUSH_OUTPUT (mips_desc
);
1444 sprintf (tbuff
, "\r/E/E\r");
1445 SERIAL_WRITE (mips_desc
, tbuff
, 6);
1452 /* We are possibly in binary download mode, having
1453 aborted in the middle of an S-record. ^C won't
1454 work because of binary mode. The only reliable way
1455 out is to send enough termination packets (8 bytes)
1456 to fill up and then overflow the largest size
1457 S-record (255 bytes in this case). This amounts to
1461 mips_make_srec (srec
, '7', 0, NULL
, 0);
1463 for (i
= 1; i
<= 33; i
++)
1465 SERIAL_WRITE (mips_desc
, srec
, 8);
1467 if (SERIAL_READCHAR (mips_desc
, 0) >= 0)
1468 break; /* Break immediatly if we get something from
1475 mips_error ("Failed to initialize.");
1478 if (mips_expect (mips_monitor_prompt
))
1482 if (mips_monitor
!= MON_IDT
)
1484 /* Sometimes PMON ignores the first few characters in the first
1485 command sent after a load. Sending a blank command gets
1487 mips_send_command ("\r", -1);
1489 /* Ensure the correct target state: */
1490 if (mips_monitor
!= MON_LSI
)
1491 mips_send_command ("set regsize 64\r", -1);
1492 mips_send_command ("set hostport tty0\r", -1);
1493 mips_send_command ("set brkcmd \"\"\r", -1);
1494 /* Delete all the current breakpoints: */
1495 mips_send_command ("db *\r", -1);
1496 /* NOTE: PMON does not have breakpoint support through the
1497 "debug" mode, only at the monitor command-line. */
1500 mips_enter_debug ();
1502 /* Clear all breakpoints: */
1503 if ((mips_monitor
== MON_IDT
1504 && clear_breakpoint (-1, 0, BREAK_UNUSED
) == 0)
1505 || mips_monitor
== MON_LSI
)
1506 monitor_supports_breakpoints
= 1;
1508 monitor_supports_breakpoints
= 0;
1510 do_cleanups (old_cleanups
);
1512 /* If this doesn't call error, we have connected; we don't care if
1513 the request itself succeeds or fails. */
1515 mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err
,
1516 mips_receive_wait
, NULL
);
1517 set_current_frame (create_new_frame (read_fp (), read_pc ()));
1518 select_frame (get_current_frame (), 0);
1521 /* Open a connection to the remote board. */
1523 common_open (ops
, name
, from_tty
, new_monitor
, new_monitor_prompt
)
1524 struct target_ops
*ops
;
1527 enum mips_monitor_type new_monitor
;
1528 char *new_monitor_prompt
;
1531 char *serial_port_name
;
1532 char *remote_name
= 0;
1533 char *local_name
= 0;
1538 "To open a MIPS remote debugging connection, you need to specify what serial\n\
1539 device is attached to the target board (e.g., /dev/ttya).\n"
1540 "If you want to use TFTP to download to the board, specify the name of a\n"
1541 "temporary file to be used by GDB for downloads as the second argument.\n"
1542 "This filename must be in the form host:filename, where host is the name\n"
1543 "of the host running the TFTP server, and the file must be readable by the\n"
1544 "world. If the local name of the temporary file differs from the name as\n"
1545 "seen from the board via TFTP, specify that name as the third parameter.\n");
1547 /* Parse the serial port name, the optional TFTP name, and the
1548 optional local TFTP name. */
1549 if ((argv
= buildargv (name
)) == NULL
)
1551 make_cleanup_freeargv (argv
);
1553 serial_port_name
= strsave (argv
[0]);
1554 if (argv
[1]) /* remote TFTP name specified? */
1556 remote_name
= argv
[1];
1557 if (argv
[2]) /* local TFTP filename specified? */
1558 local_name
= argv
[2];
1561 target_preopen (from_tty
);
1564 unpush_target (current_ops
);
1566 /* Open and initialize the serial port. */
1567 mips_desc
= SERIAL_OPEN (serial_port_name
);
1568 if (mips_desc
== (serial_t
) NULL
)
1569 perror_with_name (serial_port_name
);
1571 if (baud_rate
!= -1)
1573 if (SERIAL_SETBAUDRATE (mips_desc
, baud_rate
))
1575 SERIAL_CLOSE (mips_desc
);
1576 perror_with_name (serial_port_name
);
1580 SERIAL_RAW (mips_desc
);
1582 /* Open and initialize the optional download port. If it is in the form
1583 hostname#portnumber, it's a UDP socket. If it is in the form
1584 hostname:filename, assume it's the TFTP filename that must be
1585 passed to the DDB board to tell it where to get the load file. */
1588 if (strchr (remote_name
, '#'))
1590 udp_desc
= SERIAL_OPEN (remote_name
);
1592 perror_with_name ("Unable to open UDP port");
1597 /* Save the remote and local names of the TFTP temp file. If
1598 the user didn't specify a local name, assume it's the same
1599 as the part of the remote name after the "host:". */
1603 free (tftp_localname
);
1604 if (local_name
== NULL
)
1605 if ((local_name
= strchr (remote_name
, ':')) != NULL
)
1606 local_name
++; /* skip over the colon */
1607 if (local_name
== NULL
)
1608 local_name
= remote_name
; /* local name same as remote name */
1609 tftp_name
= strsave (remote_name
);
1610 tftp_localname
= strsave (local_name
);
1618 /* Reset the expected monitor prompt if it's never been set before. */
1619 if (mips_monitor_prompt
== NULL
)
1620 mips_monitor_prompt
= strsave (new_monitor_prompt
);
1621 mips_monitor
= new_monitor
;
1626 printf_unfiltered ("Remote MIPS debugging using %s\n", serial_port_name
);
1628 /* Switch to using remote target now. */
1631 /* FIXME: Should we call start_remote here? */
1633 /* Try to figure out the processor model if possible. */
1634 ptype
= mips_read_processor_type ();
1636 mips_set_processor_type_command (strsave (ptype
), 0);
1638 /* This is really the job of start_remote however, that makes an assumption
1639 that the target is about to print out a status message of some sort. That
1640 doesn't happen here (in fact, it may not be possible to get the monitor to
1641 send the appropriate packet). */
1643 flush_cached_frames ();
1644 registers_changed ();
1645 stop_pc
= read_pc ();
1646 set_current_frame (create_new_frame (read_fp (), stop_pc
));
1647 select_frame (get_current_frame (), 0);
1648 print_stack_frame (selected_frame
, -1, 1);
1649 free (serial_port_name
);
1653 mips_open (name
, from_tty
)
1657 common_open (&mips_ops
, name
, from_tty
, MON_IDT
, TARGET_MONITOR_PROMPT
);
1661 pmon_open (name
, from_tty
)
1665 common_open (&pmon_ops
, name
, from_tty
, MON_PMON
, "PMON> ");
1669 ddb_open (name
, from_tty
)
1673 common_open (&ddb_ops
, name
, from_tty
, MON_DDB
, "NEC010>");
1677 lsi_open (name
, from_tty
)
1683 /* Clear the LSI breakpoint table. */
1684 for (i
= 0; i
< MAX_LSI_BREAKPOINTS
; i
++)
1685 lsi_breakpoints
[i
].type
= BREAK_UNUSED
;
1687 common_open (&lsi_ops
, name
, from_tty
, MON_LSI
, "PMON> ");
1690 /* Close a connection to the remote board. */
1693 mips_close (quitting
)
1698 /* Get the board out of remote debugging mode. */
1699 (void) mips_exit_debug ();
1705 /* Detach from the remote board. */
1708 mips_detach (args
, from_tty
)
1713 error ("Argument given to \"detach\" when remotely debugging.");
1720 printf_unfiltered ("Ending remote MIPS debugging.\n");
1723 /* Tell the target board to resume. This does not wait for a reply
1724 from the board, except in the case of single-stepping on LSI boards,
1725 where PMON does return a reply. */
1728 mips_resume (pid
, step
, siggnal
)
1730 enum target_signal siggnal
;
1734 /* LSI PMON requires returns a reply packet "0x1 s 0x0 0x57f" after
1735 a single step, so we wait for that. */
1736 mips_request (step
? 's' : 'c',
1738 (unsigned int) siggnal
,
1739 mips_monitor
== MON_LSI
&& step
? &err
: (int *) NULL
,
1740 mips_receive_wait
, NULL
);
1743 /* Return the signal corresponding to SIG, where SIG is the number which
1744 the MIPS protocol uses for the signal. */
1746 mips_signal_from_protocol (sig
)
1749 /* We allow a few more signals than the IDT board actually returns, on
1750 the theory that there is at least *some* hope that perhaps the numbering
1751 for these signals is widely agreed upon. */
1754 return TARGET_SIGNAL_UNKNOWN
;
1756 /* Don't want to use target_signal_from_host because we are converting
1757 from MIPS signal numbers, not host ones. Our internal numbers
1758 match the MIPS numbers for the signals the board can return, which
1759 are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */
1760 return (enum target_signal
) sig
;
1763 /* Wait until the remote stops, and return a wait status. */
1766 mips_wait (pid
, status
)
1768 struct target_waitstatus
*status
;
1772 char buff
[DATA_MAXLEN
];
1778 interrupt_count
= 0;
1781 /* If we have not sent a single step or continue command, then the
1782 board is waiting for us to do something. Return a status
1783 indicating that it is stopped. */
1784 if (!mips_need_reply
)
1786 status
->kind
= TARGET_WAITKIND_STOPPED
;
1787 status
->value
.sig
= TARGET_SIGNAL_TRAP
;
1791 /* No timeout; we sit here as long as the program continues to execute. */
1793 rstatus
= mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err
, -1,
1797 mips_error ("Remote failure: %s", safe_strerror (errno
));
1799 /* On returning from a continue, the PMON monitor seems to start
1800 echoing back the messages we send prior to sending back the
1801 ACK. The code can cope with this, but to try and avoid the
1802 unnecessary serial traffic, and "spurious" characters displayed
1803 to the user, we cheat and reset the debug protocol. The problems
1804 seems to be caused by a check on the number of arguments, and the
1805 command length, within the monitor causing it to echo the command
1807 if (mips_monitor
== MON_PMON
)
1810 mips_enter_debug ();
1813 /* See if we got back extended status. If so, pick out the pc, fp, sp, etc... */
1815 nfields
= sscanf (buff
, "0x%*x %*c 0x%*x 0x%*x 0x%x 0x%x 0x%x 0x%*x %s",
1816 &rpc
, &rfp
, &rsp
, flags
);
1819 char buf
[MAX_REGISTER_RAW_SIZE
];
1821 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (PC_REGNUM
), rpc
);
1822 supply_register (PC_REGNUM
, buf
);
1824 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (PC_REGNUM
), rfp
);
1825 supply_register (30, buf
); /* This register they are avoiding and so it is unnamed */
1827 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (SP_REGNUM
), rsp
);
1828 supply_register (SP_REGNUM
, buf
);
1830 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (FP_REGNUM
), 0);
1831 supply_register (FP_REGNUM
, buf
);
1837 for (i
= 0; i
<= 2; i
++)
1838 if (flags
[i
] == 'r' || flags
[i
] == 'w')
1840 else if (flags
[i
] == '\000')
1845 if (strcmp (target_shortname
, "lsi") == 0)
1848 /* If this is an LSI PMON target, see if we just hit a hardrdware watchpoint.
1849 Right now, PMON doesn't give us enough information to determine which
1850 breakpoint we hit. So we have to look up the PC in our own table
1851 of breakpoints, and if found, assume it's just a normal instruction
1852 fetch breakpoint, not a data watchpoint. FIXME when PMON
1853 provides some way to tell us what type of breakpoint it is. */
1855 CORE_ADDR pc
= read_pc ();
1858 for (i
= 0; i
< MAX_LSI_BREAKPOINTS
; i
++)
1860 if (lsi_breakpoints
[i
].addr
== pc
1861 && lsi_breakpoints
[i
].type
== BREAK_FETCH
)
1868 /* If a data breakpoint was hit, PMON returns the following packet:
1870 The return packet from an ordinary breakpoint doesn't have the
1871 extra 0x01 field tacked onto the end. */
1872 if (nfields
== 1 && rpc
== 1)
1877 /* NOTE: The following (sig) numbers are defined by PMON:
1878 SPP_SIGTRAP 5 breakpoint
1886 /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG
1887 and so on, because the constants we want here are determined by the
1888 MIPS protocol and have nothing to do with what host we are running on. */
1889 if ((rstatus
& 0xff) == 0)
1891 status
->kind
= TARGET_WAITKIND_EXITED
;
1892 status
->value
.integer
= (((rstatus
) >> 8) & 0xff);
1894 else if ((rstatus
& 0xff) == 0x7f)
1896 status
->kind
= TARGET_WAITKIND_STOPPED
;
1897 status
->value
.sig
= mips_signal_from_protocol (((rstatus
) >> 8) & 0xff);
1899 /* If the stop PC is in the _exit function, assume
1900 we hit the 'break 0x3ff' instruction in _exit, so this
1901 is not a normal breakpoint. */
1902 if (strcmp (target_shortname
, "lsi") == 0)
1905 CORE_ADDR func_start
;
1906 CORE_ADDR pc
= read_pc ();
1908 find_pc_partial_function (pc
, &func_name
, &func_start
, NULL
);
1909 if (func_name
!= NULL
&& strcmp (func_name
, "_exit") == 0
1910 && func_start
== pc
)
1911 status
->kind
= TARGET_WAITKIND_EXITED
;
1916 status
->kind
= TARGET_WAITKIND_SIGNALLED
;
1917 status
->value
.sig
= mips_signal_from_protocol (rstatus
& 0x7f);
1923 /* We have to map between the register numbers used by gdb and the
1924 register numbers used by the debugging protocol. This function
1925 assumes that we are using tm-mips.h. */
1927 #define REGNO_OFFSET 96
1930 mips_map_regno (regno
)
1935 if (regno
>= FP0_REGNUM
&& regno
< FP0_REGNUM
+ 32)
1936 return regno
- FP0_REGNUM
+ 32;
1940 return REGNO_OFFSET
+ 0;
1942 return REGNO_OFFSET
+ 1;
1944 return REGNO_OFFSET
+ 2;
1946 return REGNO_OFFSET
+ 3;
1948 return REGNO_OFFSET
+ 4;
1950 return REGNO_OFFSET
+ 5;
1952 /* FIXME: Is there a way to get the status register? */
1957 /* Fetch the remote registers. */
1960 mips_fetch_registers (regno
)
1963 unsigned LONGEST val
;
1968 for (regno
= 0; regno
< NUM_REGS
; regno
++)
1969 mips_fetch_registers (regno
);
1973 if (regno
== FP_REGNUM
|| regno
== ZERO_REGNUM
)
1974 /* FP_REGNUM on the mips is a hack which is just supposed to read
1975 zero (see also mips-nat.c). */
1979 /* If PMON doesn't support this register, don't waste serial
1980 bandwidth trying to read it. */
1981 int pmon_reg
= mips_map_regno (regno
);
1982 if (regno
!= 0 && pmon_reg
== 0)
1986 /* Unfortunately the PMON version in the Vr4300 board has been
1987 compiled without the 64bit register access commands. This
1988 means we cannot get hold of the full register width. */
1989 if (mips_monitor
== MON_DDB
)
1990 val
= (unsigned) mips_request ('t', (unsigned int) pmon_reg
,
1991 (unsigned int) 0, &err
, mips_receive_wait
, NULL
);
1993 val
= mips_request ('r', (unsigned int) pmon_reg
,
1994 (unsigned int) 0, &err
, mips_receive_wait
, NULL
);
1996 mips_error ("Can't read register %d: %s", regno
,
1997 safe_strerror (errno
));
2002 char buf
[MAX_REGISTER_RAW_SIZE
];
2004 /* We got the number the register holds, but gdb expects to see a
2005 value in the target byte ordering. */
2006 store_unsigned_integer (buf
, REGISTER_RAW_SIZE (regno
), val
);
2007 supply_register (regno
, buf
);
2011 /* Prepare to store registers. The MIPS protocol can store individual
2012 registers, so this function doesn't have to do anything. */
2015 mips_prepare_to_store ()
2019 /* Store remote register(s). */
2022 mips_store_registers (regno
)
2029 for (regno
= 0; regno
< NUM_REGS
; regno
++)
2030 mips_store_registers (regno
);
2034 mips_request ('R', (unsigned int) mips_map_regno (regno
),
2035 read_register (regno
),
2036 &err
, mips_receive_wait
, NULL
);
2038 mips_error ("Can't write register %d: %s", regno
, safe_strerror (errno
));
2041 /* Fetch a word from the target board. */
2044 mips_fetch_word (addr
)
2050 /* FIXME! addr was cast to uint! */
2051 val
= mips_request ('d', addr
, (unsigned int) 0, &err
,
2052 mips_receive_wait
, NULL
);
2055 /* Data space failed; try instruction space. */
2056 /* FIXME! addr was cast to uint! */
2057 val
= mips_request ('i', addr
, (unsigned int) 0, &err
,
2058 mips_receive_wait
, NULL
);
2060 mips_error ("Can't read address 0x%s: %s",
2061 paddr_nz (addr
), safe_strerror (errno
));
2066 /* Store a word to the target board. Returns errno code or zero for
2067 success. If OLD_CONTENTS is non-NULL, put the old contents of that
2068 memory location there. */
2070 /* FIXME! make sure only 32-bit quantities get stored! */
2072 mips_store_word (addr
, val
, old_contents
)
2078 unsigned int oldcontents
;
2080 oldcontents
= mips_request ('D', addr
, (unsigned int) val
,
2082 mips_receive_wait
, NULL
);
2085 /* Data space failed; try instruction space. */
2086 oldcontents
= mips_request ('I', addr
,
2087 (unsigned int) val
, &err
,
2088 mips_receive_wait
, NULL
);
2092 if (old_contents
!= NULL
)
2093 store_unsigned_integer (old_contents
, 4, oldcontents
);
2097 /* Read or write LEN bytes from inferior memory at MEMADDR,
2098 transferring to or from debugger address MYADDR. Write to inferior
2099 if SHOULD_WRITE is nonzero. Returns length of data written or
2100 read; 0 for error. Note that protocol gives us the correct value
2101 for a longword, since it transfers values in ASCII. We want the
2102 byte values, so we have to swap the longword values. */
2105 mips_xfer_memory (memaddr
, myaddr
, len
, write
, ignore
)
2110 struct target_ops
*ignore
;
2113 /* Round starting address down to longword boundary. */
2114 register CORE_ADDR addr
= memaddr
& ~3;
2115 /* Round ending address up; get number of longwords that makes. */
2116 register int count
= (((memaddr
+ len
) - addr
) + 3) / 4;
2117 /* Allocate buffer of that many longwords. */
2118 register char *buffer
= alloca (count
* 4);
2124 /* Fill start and end extra bytes of buffer with existing data. */
2125 if (addr
!= memaddr
|| len
< 4)
2127 /* Need part of initial word -- fetch it. */
2128 store_unsigned_integer (&buffer
[0], 4, mips_fetch_word (addr
));
2133 /* Need part of last word -- fetch it. FIXME: we do this even
2134 if we don't need it. */
2135 store_unsigned_integer (&buffer
[(count
- 1) * 4], 4,
2136 mips_fetch_word (addr
+ (count
- 1) * 4));
2139 /* Copy data to be written over corresponding part of buffer */
2141 memcpy ((char *) buffer
+ (memaddr
& 3), myaddr
, len
);
2143 /* Write the entire buffer. */
2145 for (i
= 0; i
< count
; i
++, addr
+= 4)
2147 status
= mips_store_word (addr
,
2148 extract_unsigned_integer (&buffer
[i
* 4], 4),
2150 /* Report each kilobyte (we download 32-bit words at a time) */
2153 printf_unfiltered ("*");
2154 gdb_flush (gdb_stdout
);
2161 /* FIXME: Do we want a QUIT here? */
2164 printf_unfiltered ("\n");
2168 /* Read all the longwords */
2169 for (i
= 0; i
< count
; i
++, addr
+= 4)
2171 store_unsigned_integer (&buffer
[i
* 4], 4, mips_fetch_word (addr
));
2175 /* Copy appropriate bytes out of the buffer. */
2176 memcpy (myaddr
, buffer
+ (memaddr
& 3), len
);
2181 /* Print info on this target. */
2184 mips_files_info (ignore
)
2185 struct target_ops
*ignore
;
2187 printf_unfiltered ("Debugging a MIPS board over a serial line.\n");
2190 /* Kill the process running on the board. This will actually only
2191 work if we are doing remote debugging over the console input. I
2192 think that if IDT/sim had the remote debug interrupt enabled on the
2193 right port, we could interrupt the process with a break signal. */
2198 if (!mips_wait_flag
)
2203 if (interrupt_count
>= 2)
2205 interrupt_count
= 0;
2207 target_terminal_ours ();
2209 if (query ("Interrupted while waiting for the program.\n\
2210 Give up (and stop debugging it)? "))
2212 /* Clean up in such a way that mips_close won't try to talk to the
2213 board (it almost surely won't work since we weren't able to talk to
2218 printf_unfiltered ("Ending remote MIPS debugging.\n");
2219 target_mourn_inferior ();
2221 return_to_top_level (RETURN_QUIT
);
2224 target_terminal_inferior ();
2227 if (remote_debug
> 0)
2228 printf_unfiltered ("Sending break\n");
2230 SERIAL_SEND_BREAK (mips_desc
);
2239 SERIAL_WRITE (mips_desc
, &cc
, 1);
2241 target_mourn_inferior ();
2246 /* Start running on the target board. */
2249 mips_create_inferior (execfile
, args
, env
)
2259 Can't pass arguments to remote MIPS board; arguments ignored.");
2260 /* And don't try to use them on the next "run" command. */
2261 execute_command ("set args", 0);
2264 if (execfile
== 0 || exec_bfd
== 0)
2265 error ("No executable file specified");
2267 entry_pt
= (CORE_ADDR
) bfd_get_start_address (exec_bfd
);
2269 init_wait_for_inferior ();
2271 /* FIXME: Should we set inferior_pid here? */
2273 proceed (entry_pt
, TARGET_SIGNAL_DEFAULT
, 0);
2276 /* Clean up after a process. Actually nothing to do. */
2279 mips_mourn_inferior ()
2281 if (current_ops
!= NULL
)
2282 unpush_target (current_ops
);
2283 generic_mourn_inferior ();
2286 /* We can write a breakpoint and read the shadow contents in one
2289 /* Insert a breakpoint. On targets that don't have built-in breakpoint
2290 support, we read the contents of the target location and stash it,
2291 then overwrite it with a breakpoint instruction. ADDR is the target
2292 location in the target machine. CONTENTS_CACHE is a pointer to
2293 memory allocated for saving the target contents. It is guaranteed
2294 by the caller to be long enough to save sizeof BREAKPOINT bytes (this
2295 is accomplished via BREAKPOINT_MAX). */
2298 mips_insert_breakpoint (addr
, contents_cache
)
2300 char *contents_cache
;
2302 if (monitor_supports_breakpoints
)
2303 return set_breakpoint (addr
, MIPS_INSTLEN
, BREAK_FETCH
);
2305 return memory_insert_breakpoint (addr
, contents_cache
);
2309 mips_remove_breakpoint (addr
, contents_cache
)
2311 char *contents_cache
;
2313 if (monitor_supports_breakpoints
)
2314 return clear_breakpoint (addr
, MIPS_INSTLEN
, BREAK_FETCH
);
2316 return memory_remove_breakpoint (addr
, contents_cache
);
2319 #if 0 /* currently not used */
2320 /* PMON does not currently provide support for the debug mode 'b'
2321 commands to manipulate breakpoints. However, if we wanted to use
2322 the monitor breakpoints (rather than the GDB BREAK_INSN version)
2323 then this code performs the work needed to leave debug mode,
2324 set/clear the breakpoint, and then return to debug mode. */
2326 #define PMON_MAX_BP (33) /* 32 SW, 1 HW */
2327 static CORE_ADDR mips_pmon_bp_info
[PMON_MAX_BP
];
2328 /* NOTE: The code relies on this vector being zero-initialised by the system */
2331 pmon_insert_breakpoint (addr
, contents_cache
)
2333 char *contents_cache
;
2337 if (monitor_supports_breakpoints
)
2339 char tbuff
[12]; /* space for breakpoint command */
2343 /* PMON does not support debug level breakpoint set/remove: */
2344 if (mips_exit_debug ())
2345 mips_error ("Failed to exit debug mode");
2347 sprintf (tbuff
, "b %08x\r", addr
);
2348 mips_send_command (tbuff
, 0);
2350 mips_expect ("Bpt ");
2352 if (!mips_getstring (tbuff
, 2))
2354 tbuff
[2] = '\0'; /* terminate the string */
2355 if (sscanf (tbuff
, "%d", &bpnum
) != 1)
2357 fprintf_unfiltered (gdb_stderr
,
2358 "Invalid decimal breakpoint number from target: %s\n", tbuff
);
2362 mips_expect (" = ");
2364 /* Lead in the hex number we are expecting: */
2368 /* FIXME!! only 8 bytes! need to expand for Bfd64;
2369 which targets return 64-bit addresses? PMON returns only 32! */
2370 if (!mips_getstring (&tbuff
[2], 8))
2372 tbuff
[10] = '\0'; /* terminate the string */
2374 if (sscanf (tbuff
, "0x%08x", &bpaddr
) != 1)
2376 fprintf_unfiltered (gdb_stderr
,
2377 "Invalid hex address from target: %s\n", tbuff
);
2381 if (bpnum
>= PMON_MAX_BP
)
2383 fprintf_unfiltered (gdb_stderr
,
2384 "Error: Returned breakpoint number %d outside acceptable range (0..%d)\n",
2385 bpnum
, PMON_MAX_BP
- 1);
2390 fprintf_unfiltered (gdb_stderr
, "Warning: Breakpoint addresses do not match: 0x%x != 0x%x\n", addr
, bpaddr
);
2392 mips_pmon_bp_info
[bpnum
] = bpaddr
;
2394 mips_expect ("\r\n");
2395 mips_expect (mips_monitor_prompt
);
2397 mips_enter_debug ();
2402 return mips_store_word (addr
, BREAK_INSN
, contents_cache
);
2406 pmon_remove_breakpoint (addr
, contents_cache
)
2408 char *contents_cache
;
2410 if (monitor_supports_breakpoints
)
2413 char tbuff
[7]; /* enough for delete breakpoint command */
2415 for (bpnum
= 0; bpnum
< PMON_MAX_BP
; bpnum
++)
2416 if (mips_pmon_bp_info
[bpnum
] == addr
)
2419 if (bpnum
>= PMON_MAX_BP
)
2421 fprintf_unfiltered (gdb_stderr
,
2422 "pmon_remove_breakpoint: Failed to find breakpoint at address 0x%s\n",
2427 if (mips_exit_debug ())
2428 mips_error ("Failed to exit debug mode");
2430 sprintf (tbuff
, "db %02d\r", bpnum
);
2432 mips_send_command (tbuff
, -1);
2433 /* NOTE: If the breakpoint does not exist then a "Bpt <dd> not
2434 set" message will be returned. */
2436 mips_enter_debug ();
2441 return target_write_memory (addr
, contents_cache
, BREAK_INSN_SIZE
);
2446 /* Tell whether this target can support a hardware breakpoint. CNT
2447 is the number of hardware breakpoints already installed. This
2448 implements the TARGET_CAN_USE_HARDWARE_WATCHPOINT macro. */
2451 remote_mips_can_use_hardware_watchpoint (cnt
)
2454 return cnt
< MAX_LSI_BREAKPOINTS
&& strcmp (target_shortname
, "lsi") == 0;
2458 /* Compute a don't care mask for the region bounding ADDR and ADDR + LEN - 1.
2459 This is used for memory ref breakpoints. */
2461 static unsigned long
2462 calculate_mask (addr
, len
)
2469 mask
= addr
^ (addr
+ len
- 1);
2471 for (i
= 32; i
>= 0; i
--)
2477 mask
= (unsigned long) 0xffffffff >> i
;
2483 /* Insert a hardware breakpoint. This works only on LSI targets, which
2484 implement ordinary breakpoints using hardware facilities. */
2487 remote_mips_insert_hw_breakpoint (addr
, contents_cache
)
2489 char *contents_cache
;
2491 if (strcmp (target_shortname
, "lsi") == 0)
2492 return mips_insert_breakpoint (addr
, contents_cache
);
2498 /* Remove a hardware breakpoint. This works only on LSI targets, which
2499 implement ordinary breakpoints using hardware facilities. */
2502 remote_mips_remove_hw_breakpoint (addr
, contents_cache
)
2504 char *contents_cache
;
2506 if (strcmp (target_shortname
, "lsi") == 0)
2507 return mips_remove_breakpoint (addr
, contents_cache
);
2512 /* Set a data watchpoint. ADDR and LEN should be obvious. TYPE is 0
2513 for a write watchpoint, 1 for a read watchpoint, or 2 for a read/write
2517 remote_mips_set_watchpoint (addr
, len
, type
)
2522 if (set_breakpoint (addr
, len
, type
))
2529 remote_mips_remove_watchpoint (addr
, len
, type
)
2534 if (clear_breakpoint (addr
, len
, type
))
2541 remote_mips_stopped_by_watchpoint (void)
2543 return hit_watchpoint
;
2547 /* Insert a breakpoint. */
2550 set_breakpoint (addr
, len
, type
)
2553 enum break_type type
;
2555 return common_breakpoint (1, addr
, len
, type
);
2559 /* Clear a breakpoint. */
2562 clear_breakpoint (addr
, len
, type
)
2565 enum break_type type
;
2567 return common_breakpoint (0, addr
, len
, type
);
2571 /* Check the error code from the return packet for an LSI breakpoint
2572 command. If there's no error, just return 0. If it's a warning,
2573 print the warning text and return 0. If it's an error, print
2574 the error text and return 1. <ADDR> is the address of the breakpoint
2575 that was being set. <RERRFLG> is the error code returned by PMON.
2576 This is a helper function for common_breakpoint. */
2579 check_lsi_error (addr
, rerrflg
)
2583 struct lsi_error
*err
;
2584 char *saddr
= paddr_nz (addr
); /* printable address string */
2586 if (rerrflg
== 0) /* no error */
2589 /* Warnings can be ORed together, so check them all. */
2590 if (rerrflg
& W_WARN
)
2592 if (monitor_warnings
)
2595 for (err
= lsi_warning_table
; err
->code
!= 0; err
++)
2597 if ((err
->code
& rerrflg
) == err
->code
)
2600 fprintf_unfiltered (gdb_stderr
,
2601 "common_breakpoint (0x%s): Warning: %s\n",
2607 fprintf_unfiltered (gdb_stderr
,
2608 "common_breakpoint (0x%s): Unknown warning: 0x%x\n",
2615 /* Errors are unique, i.e. can't be ORed together. */
2616 for (err
= lsi_error_table
; err
->code
!= 0; err
++)
2618 if ((err
->code
& rerrflg
) == err
->code
)
2620 fprintf_unfiltered (gdb_stderr
,
2621 "common_breakpoint (0x%s): Error: %s\n",
2627 fprintf_unfiltered (gdb_stderr
,
2628 "common_breakpoint (0x%s): Unknown error: 0x%x\n",
2635 /* This routine sends a breakpoint command to the remote target.
2637 <SET> is 1 if setting a breakpoint, or 0 if clearing a breakpoint.
2638 <ADDR> is the address of the breakpoint.
2639 <LEN> the length of the region to break on.
2640 <TYPE> is the type of breakpoint:
2641 0 = write (BREAK_WRITE)
2642 1 = read (BREAK_READ)
2643 2 = read/write (BREAK_ACCESS)
2644 3 = instruction fetch (BREAK_FETCH)
2646 Return 0 if successful; otherwise 1. */
2649 common_breakpoint (set
, addr
, len
, type
)
2653 enum break_type type
;
2655 char buf
[DATA_MAXLEN
+ 1];
2657 int rpid
, rerrflg
, rresponse
, rlen
;
2660 addr
= ADDR_BITS_REMOVE (addr
);
2662 if (mips_monitor
== MON_LSI
)
2664 if (set
== 0) /* clear breakpoint */
2666 /* The LSI PMON "clear breakpoint" has this form:
2667 <pid> 'b' <bptn> 0x0
2669 <pid> 'b' 0x0 <code>
2671 <bptn> is a breakpoint number returned by an earlier 'B' command.
2672 Possible return codes: OK, E_BPT. */
2676 /* Search for the breakpoint in the table. */
2677 for (i
= 0; i
< MAX_LSI_BREAKPOINTS
; i
++)
2678 if (lsi_breakpoints
[i
].type
== type
2679 && lsi_breakpoints
[i
].addr
== addr
2680 && lsi_breakpoints
[i
].len
== len
)
2683 /* Clear the table entry and tell PMON to clear the breakpoint. */
2684 if (i
== MAX_LSI_BREAKPOINTS
)
2686 warning ("common_breakpoint: Attempt to clear bogus breakpoint at %s\n",
2691 lsi_breakpoints
[i
].type
= BREAK_UNUSED
;
2692 sprintf (buf
, "0x0 b 0x%x 0x0", i
);
2693 mips_send_packet (buf
, 1);
2695 rlen
= mips_receive_packet (buf
, 1, mips_receive_wait
);
2698 nfields
= sscanf (buf
, "0x%x b 0x0 0x%x", &rpid
, &rerrflg
);
2700 mips_error ("common_breakpoint: Bad response from remote board: %s", buf
);
2702 return (check_lsi_error (addr
, rerrflg
));
2705 /* set a breakpoint */
2707 /* The LSI PMON "set breakpoint" command has this form:
2708 <pid> 'B' <addr> 0x0
2710 <pid> 'B' <bptn> <code>
2712 The "set data breakpoint" command has this form:
2714 <pid> 'A' <addr1> <type> [<addr2> [<value>]]
2716 where: type= "0x1" = read
2718 "0x3" = access (read or write)
2720 The reply returns two values:
2721 bptn - a breakpoint number, which is a small integer with
2722 possible values of zero through 255.
2723 code - an error return code, a value of zero indicates a
2724 succesful completion, other values indicate various
2725 errors and warnings.
2727 Possible return codes: OK, W_QAL, E_QAL, E_OUT, E_NON.
2731 if (type
== BREAK_FETCH
) /* instruction breakpoint */
2734 sprintf (buf
, "0x0 B 0x%s 0x0", paddr_nz (addr
));
2740 sprintf (buf
, "0x0 A 0x%s 0x%x 0x%s", paddr_nz (addr
),
2741 type
== BREAK_READ
? 1 : (type
== BREAK_WRITE
? 2 : 3),
2742 paddr_nz (addr
+ len
- 1));
2744 mips_send_packet (buf
, 1);
2746 rlen
= mips_receive_packet (buf
, 1, mips_receive_wait
);
2749 nfields
= sscanf (buf
, "0x%x %c 0x%x 0x%x",
2750 &rpid
, &rcmd
, &rresponse
, &rerrflg
);
2751 if (nfields
!= 4 || rcmd
!= cmd
|| rresponse
> 255)
2752 mips_error ("common_breakpoint: Bad response from remote board: %s", buf
);
2755 if (check_lsi_error (addr
, rerrflg
))
2758 /* rresponse contains PMON's breakpoint number. Record the
2759 information for this breakpoint so we can clear it later. */
2760 lsi_breakpoints
[rresponse
].type
= type
;
2761 lsi_breakpoints
[rresponse
].addr
= addr
;
2762 lsi_breakpoints
[rresponse
].len
= len
;
2769 /* On non-LSI targets, the breakpoint command has this form:
2770 0x0 <CMD> <ADDR> <MASK> <FLAGS>
2771 <MASK> is a don't care mask for addresses.
2772 <FLAGS> is any combination of `r', `w', or `f' for read/write/fetch.
2776 mask
= calculate_mask (addr
, len
);
2779 if (set
) /* set a breakpoint */
2784 case BREAK_WRITE
: /* write */
2787 case BREAK_READ
: /* read */
2790 case BREAK_ACCESS
: /* read/write */
2793 case BREAK_FETCH
: /* fetch */
2801 sprintf (buf
, "0x0 B 0x%s 0x%s %s", paddr_nz (addr
),
2802 paddr_nz (mask
), flags
);
2807 sprintf (buf
, "0x0 b 0x%s", paddr_nz (addr
));
2810 mips_send_packet (buf
, 1);
2812 rlen
= mips_receive_packet (buf
, 1, mips_receive_wait
);
2815 nfields
= sscanf (buf
, "0x%x %c 0x%x 0x%x",
2816 &rpid
, &rcmd
, &rerrflg
, &rresponse
);
2818 if (nfields
!= 4 || rcmd
!= cmd
)
2819 mips_error ("common_breakpoint: Bad response from remote board: %s",
2824 /* Ddb returns "0x0 b 0x16 0x0\000", whereas
2825 Cogent returns "0x0 b 0xffffffff 0x16\000": */
2826 if (mips_monitor
== MON_DDB
)
2827 rresponse
= rerrflg
;
2828 if (rresponse
!= 22) /* invalid argument */
2829 fprintf_unfiltered (gdb_stderr
,
2830 "common_breakpoint (0x%s): Got error: 0x%x\n",
2831 paddr_nz (addr
), rresponse
);
2839 send_srec (srec
, len
, addr
)
2848 SERIAL_WRITE (mips_desc
, srec
, len
);
2850 ch
= mips_readchar (2);
2854 case SERIAL_TIMEOUT
:
2855 error ("Timeout during download.");
2859 case 0x15: /* NACK */
2860 fprintf_unfiltered (gdb_stderr
, "Download got a NACK at byte %s! Retrying.\n", paddr_u (addr
));
2863 error ("Download got unexpected ack char: 0x%x, retrying.\n", ch
);
2868 /* Download a binary file by converting it to S records. */
2871 mips_load_srec (args
)
2876 char *buffer
, srec
[1024];
2878 unsigned int srec_frame
= 200;
2880 static int hashmark
= 1;
2882 buffer
= alloca (srec_frame
* 2 + 256);
2884 abfd
= bfd_openr (args
, 0);
2887 printf_filtered ("Unable to open file %s\n", args
);
2891 if (bfd_check_format (abfd
, bfd_object
) == 0)
2893 printf_filtered ("File is not an object file\n");
2897 /* This actually causes a download in the IDT binary format: */
2898 mips_send_command (LOAD_CMD
, 0);
2900 for (s
= abfd
->sections
; s
; s
= s
->next
)
2902 if (s
->flags
& SEC_LOAD
)
2904 unsigned int numbytes
;
2906 /* FIXME! vma too small????? */
2907 printf_filtered ("%s\t: 0x%4lx .. 0x%4lx ", s
->name
,
2909 (long) (s
->vma
+ s
->_raw_size
));
2910 gdb_flush (gdb_stdout
);
2912 for (i
= 0; i
< s
->_raw_size
; i
+= numbytes
)
2914 numbytes
= min (srec_frame
, s
->_raw_size
- i
);
2916 bfd_get_section_contents (abfd
, s
, buffer
, i
, numbytes
);
2918 reclen
= mips_make_srec (srec
, '3', s
->vma
+ i
, buffer
, numbytes
);
2919 send_srec (srec
, reclen
, s
->vma
+ i
);
2923 putchar_unfiltered ('#');
2924 gdb_flush (gdb_stdout
);
2927 } /* Per-packet (or S-record) loop */
2929 putchar_unfiltered ('\n');
2930 } /* Loadable sections */
2933 putchar_unfiltered ('\n');
2935 /* Write a type 7 terminator record. no data for a type 7, and there
2936 is no data, so len is 0. */
2938 reclen
= mips_make_srec (srec
, '7', abfd
->start_address
, NULL
, 0);
2940 send_srec (srec
, reclen
, abfd
->start_address
);
2942 SERIAL_FLUSH_INPUT (mips_desc
);
2946 * mips_make_srec -- make an srecord. This writes each line, one at a
2947 * time, each with it's own header and trailer line.
2948 * An srecord looks like this:
2950 * byte count-+ address
2951 * start ---+ | | data +- checksum
2953 * S01000006F6B692D746573742E73726563E4
2954 * S315000448600000000000000000FC00005900000000E9
2955 * S31A0004000023C1400037DE00F023604000377B009020825000348D
2956 * S30B0004485A0000000000004E
2959 * S<type><length><address><data><checksum>
2963 * is the number of bytes following upto the checksum. Note that
2964 * this is not the number of chars following, since it takes two
2965 * chars to represent a byte.
2969 * 1) two byte address data record
2970 * 2) three byte address data record
2971 * 3) four byte address data record
2972 * 7) four byte address termination record
2973 * 8) three byte address termination record
2974 * 9) two byte address termination record
2977 * is the start address of the data following, or in the case of
2978 * a termination record, the start address of the image
2982 * is the sum of all the raw byte data in the record, from the length
2983 * upwards, modulo 256 and subtracted from 255.
2985 * This routine returns the length of the S-record.
2990 mips_make_srec (buf
, type
, memaddr
, myaddr
, len
)
2994 unsigned char *myaddr
;
2997 unsigned char checksum
;
3000 /* Create the header for the srec. addr_size is the number of bytes in the address,
3001 and 1 is the number of bytes in the count. */
3003 /* FIXME!! bigger buf required for 64-bit! */
3006 buf
[2] = len
+ 4 + 1; /* len + 4 byte address + 1 byte checksum */
3007 /* This assumes S3 style downloads (4byte addresses). There should
3008 probably be a check, or the code changed to make it more
3010 buf
[3] = memaddr
>> 24;
3011 buf
[4] = memaddr
>> 16;
3012 buf
[5] = memaddr
>> 8;
3014 memcpy (&buf
[7], myaddr
, len
);
3016 /* Note that the checksum is calculated on the raw data, not the
3017 hexified data. It includes the length, address and the data
3018 portions of the packet. */
3020 buf
+= 2; /* Point at length byte */
3021 for (i
= 0; i
< len
+ 4 + 1; i
++)
3029 /* The following manifest controls whether we enable the simple flow
3030 control support provided by the monitor. If enabled the code will
3031 wait for an affirmative ACK between transmitting packets. */
3032 #define DOETXACK (1)
3034 /* The PMON fast-download uses an encoded packet format constructed of
3035 3byte data packets (encoded as 4 printable ASCII characters), and
3036 escape sequences (preceded by a '/'):
3039 'C' compare checksum (12bit value, not included in checksum calculation)
3040 'S' define symbol name (for addr) terminated with "," and padded to 4char boundary
3041 'Z' zero fill multiple of 3bytes
3042 'B' byte (12bit encoded value, of 8bit data)
3043 'A' address (36bit encoded value)
3044 'E' define entry as original address, and exit load
3046 The packets are processed in 4 character chunks, so the escape
3047 sequences that do not have any data (or variable length data)
3048 should be padded to a 4 character boundary. The decoder will give
3049 an error if the complete message block size is not a multiple of
3050 4bytes (size of record).
3052 The encoding of numbers is done in 6bit fields. The 6bit value is
3053 used to index into this string to get the specific character
3054 encoding for the value: */
3055 static char encoding
[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789,.";
3057 /* Convert the number of bits required into an encoded number, 6bits
3058 at a time (range 0..63). Keep a checksum if required (passed
3059 pointer non-NULL). The function returns the number of encoded
3060 characters written into the buffer. */
3062 pmon_makeb64 (v
, p
, n
, chksum
)
3068 int count
= (n
/ 6);
3072 fprintf_unfiltered (gdb_stderr
,
3073 "Fast encoding bitcount must be a multiple of 12bits: %dbit%s\n", n
, (n
== 1) ? "" : "s");
3078 fprintf_unfiltered (gdb_stderr
,
3079 "Fast encoding cannot process more than 36bits at the moment: %dbits\n", n
);
3083 /* Deal with the checksum: */
3089 *chksum
+= ((v
>> 24) & 0xFFF);
3091 *chksum
+= ((v
>> 12) & 0xFFF);
3093 *chksum
+= ((v
>> 0) & 0xFFF);
3100 *p
++ = encoding
[(v
>> n
) & 0x3F];
3107 /* Shorthand function (that could be in-lined) to output the zero-fill
3108 escape sequence into the data stream. */
3110 pmon_zeroset (recsize
, buff
, amount
, chksum
)
3114 unsigned int *chksum
;
3118 sprintf (*buff
, "/Z");
3119 count
= pmon_makeb64 (*amount
, (*buff
+ 2), 12, chksum
);
3120 *buff
+= (count
+ 2);
3122 return (recsize
+ count
+ 2);
3126 pmon_checkset (recsize
, buff
, value
)
3133 /* Add the checksum (without updating the value): */
3134 sprintf (*buff
, "/C");
3135 count
= pmon_makeb64 (*value
, (*buff
+ 2), 12, NULL
);
3136 *buff
+= (count
+ 2);
3137 sprintf (*buff
, "\n");
3138 *buff
+= 2; /* include zero terminator */
3139 /* Forcing a checksum validation clears the sum: */
3141 return (recsize
+ count
+ 3);
3144 /* Amount of padding we leave after at the end of the output buffer,
3145 for the checksum and line termination characters: */
3146 #define CHECKSIZE (4 + 4 + 4 + 2)
3147 /* zero-fill, checksum, transfer end and line termination space. */
3149 /* The amount of binary data loaded from the object file in a single
3151 #define BINCHUNK (1024)
3153 /* Maximum line of data accepted by the monitor: */
3154 #define MAXRECSIZE (550)
3155 /* NOTE: This constant depends on the monitor being used. This value
3156 is for PMON 5.x on the Cogent Vr4300 board. */
3159 pmon_make_fastrec (outbuf
, inbuf
, inptr
, inamount
, recsize
, csum
, zerofill
)
3161 unsigned char *inbuf
;
3166 unsigned int *zerofill
;
3171 /* This is a simple check to ensure that our data will fit within
3172 the maximum allowable record size. Each record output is 4bytes
3173 in length. We must allow space for a pending zero fill command,
3174 the record, and a checksum record. */
3175 while ((*recsize
< (MAXRECSIZE
- CHECKSIZE
)) && ((inamount
- *inptr
) > 0))
3177 /* Process the binary data: */
3178 if ((inamount
- *inptr
) < 3)
3181 *recsize
= pmon_zeroset (*recsize
, &p
, zerofill
, csum
);
3183 count
= pmon_makeb64 (inbuf
[*inptr
], &p
[2], 12, csum
);
3185 *recsize
+= (2 + count
);
3190 unsigned int value
= ((inbuf
[*inptr
+ 0] << 16) | (inbuf
[*inptr
+ 1] << 8) | inbuf
[*inptr
+ 2]);
3191 /* Simple check for zero data. TODO: A better check would be
3192 to check the last, and then the middle byte for being zero
3193 (if the first byte is not). We could then check for
3194 following runs of zeros, and if above a certain size it is
3195 worth the 4 or 8 character hit of the byte insertions used
3196 to pad to the start of the zeroes. NOTE: This also depends
3197 on the alignment at the end of the zero run. */
3198 if (value
== 0x00000000)
3201 if (*zerofill
== 0xFFF) /* 12bit counter */
3202 *recsize
= pmon_zeroset (*recsize
, &p
, zerofill
, csum
);
3207 *recsize
= pmon_zeroset (*recsize
, &p
, zerofill
, csum
);
3208 count
= pmon_makeb64 (value
, p
, 24, csum
);
3221 pmon_check_ack (mesg
)
3224 #if defined(DOETXACK)
3229 c
= SERIAL_READCHAR (udp_in_use
? udp_desc
: mips_desc
, 2);
3230 if ((c
== SERIAL_TIMEOUT
) || (c
!= 0x06))
3232 fprintf_unfiltered (gdb_stderr
,
3233 "Failed to receive valid ACK for %s\n", mesg
);
3234 return (-1); /* terminate the download */
3237 #endif /* DOETXACK */
3241 /* pmon_download - Send a sequence of characters to the PMON download port,
3242 which is either a serial port or a UDP socket. */
3245 pmon_start_download ()
3249 /* Create the temporary download file. */
3250 if ((tftp_file
= fopen (tftp_localname
, "w")) == NULL
)
3251 perror_with_name (tftp_localname
);
3255 mips_send_command (udp_in_use
? LOAD_CMD_UDP
: LOAD_CMD
, 0);
3256 mips_expect ("Downloading from ");
3257 mips_expect (udp_in_use
? "udp" : "tty0");
3258 mips_expect (", ^C to abort\r\n");
3263 mips_expect_download (char *string
)
3265 if (!mips_expect (string
))
3267 fprintf_unfiltered (gdb_stderr
, "Load did not complete successfully.\n");
3269 remove (tftp_localname
); /* Remove temporary file */
3277 pmon_end_download (final
, bintotal
)
3281 char hexnumber
[9]; /* includes '\0' space */
3285 static char *load_cmd_prefix
= "load -b -s ";
3289 /* Close off the temporary file containing the load data. */
3293 /* Make the temporary file readable by the world. */
3294 if (stat (tftp_localname
, &stbuf
) == 0)
3295 chmod (tftp_localname
, stbuf
.st_mode
| S_IROTH
);
3297 /* Must reinitialize the board to prevent PMON from crashing. */
3298 mips_send_command ("initEther\r", -1);
3300 /* Send the load command. */
3301 cmd
= xmalloc (strlen (load_cmd_prefix
) + strlen (tftp_name
) + 2);
3302 strcpy (cmd
, load_cmd_prefix
);
3303 strcat (cmd
, tftp_name
);
3305 mips_send_command (cmd
, 0);
3307 if (!mips_expect_download ("Downloading from "))
3309 if (!mips_expect_download (tftp_name
))
3311 if (!mips_expect_download (", ^C to abort\r\n"))
3315 /* Wait for the stuff that PMON prints after the load has completed.
3316 The timeout value for use in the tftp case (15 seconds) was picked
3317 arbitrarily but might be too small for really large downloads. FIXME. */
3318 if (mips_monitor
== MON_LSI
)
3320 pmon_check_ack ("termination");
3321 mips_expect_timeout ("Entry address is ", tftp_in_use
? 15 : 2);
3324 mips_expect_timeout ("Entry Address = ", tftp_in_use
? 15 : 2);
3326 sprintf (hexnumber
, "%x", final
);
3327 mips_expect (hexnumber
);
3328 mips_expect ("\r\n");
3329 if (mips_monitor
!= MON_LSI
)
3330 pmon_check_ack ("termination");
3331 mips_expect ("\r\ntotal = 0x");
3332 sprintf (hexnumber
, "%x", bintotal
);
3333 mips_expect (hexnumber
);
3334 if (!mips_expect_download (" bytes\r\n"))
3338 remove (tftp_localname
); /* Remove temporary file */
3342 pmon_download (buffer
, length
)
3347 fwrite (buffer
, 1, length
, tftp_file
);
3349 SERIAL_WRITE (udp_in_use
? udp_desc
: mips_desc
, buffer
, length
);
3353 pmon_load_fast (file
)
3358 unsigned char *binbuf
;
3361 unsigned int csum
= 0;
3362 int hashmark
= !tftp_in_use
;
3367 buffer
= (char *) xmalloc (MAXRECSIZE
+ 1);
3368 binbuf
= (unsigned char *) xmalloc (BINCHUNK
);
3370 abfd
= bfd_openr (file
, 0);
3373 printf_filtered ("Unable to open file %s\n", file
);
3377 if (bfd_check_format (abfd
, bfd_object
) == 0)
3379 printf_filtered ("File is not an object file\n");
3383 /* Setup the required download state: */
3384 mips_send_command ("set dlproto etxack\r", -1);
3385 mips_send_command ("set dlecho off\r", -1);
3386 /* NOTE: We get a "cannot set variable" message if the variable is
3387 already defined to have the argument we give. The code doesn't
3388 care, since it just scans to the next prompt anyway. */
3389 /* Start the download: */
3390 pmon_start_download ();
3392 /* Zero the checksum */
3393 sprintf (buffer
, "/Kxx\n");
3394 reclen
= strlen (buffer
);
3395 pmon_download (buffer
, reclen
);
3396 finished
= pmon_check_ack ("/Kxx");
3398 for (s
= abfd
->sections
; s
&& !finished
; s
= s
->next
)
3399 if (s
->flags
& SEC_LOAD
) /* only deal with loadable sections */
3401 bintotal
+= s
->_raw_size
;
3402 final
= (s
->vma
+ s
->_raw_size
);
3404 printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s
->name
, (unsigned int) s
->vma
,
3405 (unsigned int) (s
->vma
+ s
->_raw_size
));
3406 gdb_flush (gdb_stdout
);
3408 /* Output the starting address */
3409 sprintf (buffer
, "/A");
3410 reclen
= pmon_makeb64 (s
->vma
, &buffer
[2], 36, &csum
);
3411 buffer
[2 + reclen
] = '\n';
3412 buffer
[3 + reclen
] = '\0';
3413 reclen
+= 3; /* for the initial escape code and carriage return */
3414 pmon_download (buffer
, reclen
);
3415 finished
= pmon_check_ack ("/A");
3419 unsigned int binamount
;
3420 unsigned int zerofill
= 0;
3426 for (i
= 0; ((i
< s
->_raw_size
) && !finished
); i
+= binamount
)
3430 binamount
= min (BINCHUNK
, s
->_raw_size
- i
);
3432 bfd_get_section_contents (abfd
, s
, binbuf
, i
, binamount
);
3434 /* This keeps a rolling checksum, until we decide to output
3436 for (; ((binamount
- binptr
) > 0);)
3438 pmon_make_fastrec (&bp
, binbuf
, &binptr
, binamount
, &reclen
, &csum
, &zerofill
);
3439 if (reclen
>= (MAXRECSIZE
- CHECKSIZE
))
3441 reclen
= pmon_checkset (reclen
, &bp
, &csum
);
3442 pmon_download (buffer
, reclen
);
3443 finished
= pmon_check_ack ("data record");
3446 zerofill
= 0; /* do not transmit pending zerofills */
3452 putchar_unfiltered ('#');
3453 gdb_flush (gdb_stdout
);
3457 reclen
= 0; /* buffer processed */
3462 /* Ensure no out-standing zerofill requests: */
3464 reclen
= pmon_zeroset (reclen
, &bp
, &zerofill
, &csum
);
3466 /* and then flush the line: */
3469 reclen
= pmon_checkset (reclen
, &bp
, &csum
);
3470 /* Currently pmon_checkset outputs the line terminator by
3471 default, so we write out the buffer so far: */
3472 pmon_download (buffer
, reclen
);
3473 finished
= pmon_check_ack ("record remnant");
3477 putchar_unfiltered ('\n');
3480 /* Terminate the transfer. We know that we have an empty output
3481 buffer at this point. */
3482 sprintf (buffer
, "/E/E\n"); /* include dummy padding characters */
3483 reclen
= strlen (buffer
);
3484 pmon_download (buffer
, reclen
);
3487 { /* Ignore the termination message: */
3488 SERIAL_FLUSH_INPUT (udp_in_use
? udp_desc
: mips_desc
);
3491 { /* Deal with termination message: */
3492 pmon_end_download (final
, bintotal
);
3498 /* mips_load -- download a file. */
3501 mips_load (file
, from_tty
)
3505 /* Get the board out of remote debugging mode. */
3506 if (mips_exit_debug ())
3507 error ("mips_load: Couldn't get into monitor mode.");
3509 if (mips_monitor
!= MON_IDT
)
3510 pmon_load_fast (file
);
3512 mips_load_srec (file
);
3516 /* Finally, make the PC point at the start address */
3517 if (mips_monitor
!= MON_IDT
)
3519 /* Work around problem where PMON monitor updates the PC after a load
3520 to a different value than GDB thinks it has. The following ensures
3521 that the write_pc() WILL update the PC value: */
3522 register_valid
[PC_REGNUM
] = 0;
3525 write_pc (bfd_get_start_address (exec_bfd
));
3527 inferior_pid
= 0; /* No process now */
3529 /* This is necessary because many things were based on the PC at the time that
3530 we attached to the monitor, which is no longer valid now that we have loaded
3531 new code (and just changed the PC). Another way to do this might be to call
3532 normal_stop, except that the stack may not be valid, and things would get
3533 horribly confused... */
3535 clear_symtab_users ();
3539 /* Pass the command argument as a packet to PMON verbatim. */
3542 pmon_command (args
, from_tty
)
3546 char buf
[DATA_MAXLEN
+ 1];
3549 sprintf (buf
, "0x0 %s", args
);
3550 mips_send_packet (buf
, 1);
3551 printf_filtered ("Send packet: %s\n", buf
);
3553 rlen
= mips_receive_packet (buf
, 1, mips_receive_wait
);
3555 printf_filtered ("Received packet: %s\n", buf
);
3559 _initialize_remote_mips ()
3561 /* Initialize the fields in mips_ops that are common to all four targets. */
3562 mips_ops
.to_longname
= "Remote MIPS debugging over serial line";
3563 mips_ops
.to_close
= mips_close
;
3564 mips_ops
.to_detach
= mips_detach
;
3565 mips_ops
.to_resume
= mips_resume
;
3566 mips_ops
.to_fetch_registers
= mips_fetch_registers
;
3567 mips_ops
.to_store_registers
= mips_store_registers
;
3568 mips_ops
.to_prepare_to_store
= mips_prepare_to_store
;
3569 mips_ops
.to_xfer_memory
= mips_xfer_memory
;
3570 mips_ops
.to_files_info
= mips_files_info
;
3571 mips_ops
.to_insert_breakpoint
= mips_insert_breakpoint
;
3572 mips_ops
.to_remove_breakpoint
= mips_remove_breakpoint
;
3573 mips_ops
.to_kill
= mips_kill
;
3574 mips_ops
.to_load
= mips_load
;
3575 mips_ops
.to_create_inferior
= mips_create_inferior
;
3576 mips_ops
.to_mourn_inferior
= mips_mourn_inferior
;
3577 mips_ops
.to_stratum
= process_stratum
;
3578 mips_ops
.to_has_all_memory
= 1;
3579 mips_ops
.to_has_memory
= 1;
3580 mips_ops
.to_has_stack
= 1;
3581 mips_ops
.to_has_registers
= 1;
3582 mips_ops
.to_has_execution
= 1;
3583 mips_ops
.to_magic
= OPS_MAGIC
;
3585 /* Copy the common fields to all four target vectors. */
3586 pmon_ops
= ddb_ops
= lsi_ops
= mips_ops
;
3588 /* Initialize target-specific fields in the target vectors. */
3589 mips_ops
.to_shortname
= "mips";
3590 mips_ops
.to_doc
= "\
3591 Debug a board using the MIPS remote debugging protocol over a serial line.\n\
3592 The argument is the device it is connected to or, if it contains a colon,\n\
3593 HOST:PORT to access a board over a network";
3594 mips_ops
.to_open
= mips_open
;
3595 mips_ops
.to_wait
= mips_wait
;
3597 pmon_ops
.to_shortname
= "pmon";
3598 pmon_ops
.to_doc
= "\
3599 Debug a board using the PMON MIPS remote debugging protocol over a serial\n\
3600 line. The argument is the device it is connected to or, if it contains a\n\
3601 colon, HOST:PORT to access a board over a network";
3602 pmon_ops
.to_open
= pmon_open
;
3603 pmon_ops
.to_wait
= mips_wait
;
3605 ddb_ops
.to_shortname
= "ddb";
3607 Debug a board using the PMON MIPS remote debugging protocol over a serial\n\
3608 line. The first argument is the device it is connected to or, if it contains\n\
3609 a colon, HOST:PORT to access a board over a network. The optional second\n\
3610 parameter is the temporary file in the form HOST:FILENAME to be used for\n\
3611 TFTP downloads to the board. The optional third parameter is the local name\n\
3612 of the TFTP temporary file, if it differs from the filename seen by the board.";
3613 ddb_ops
.to_open
= ddb_open
;
3614 ddb_ops
.to_wait
= mips_wait
;
3616 lsi_ops
.to_shortname
= "lsi";
3617 lsi_ops
.to_doc
= pmon_ops
.to_doc
;
3618 lsi_ops
.to_open
= lsi_open
;
3619 lsi_ops
.to_wait
= mips_wait
;
3621 /* Add the targets. */
3622 add_target (&mips_ops
);
3623 add_target (&pmon_ops
);
3624 add_target (&ddb_ops
);
3625 add_target (&lsi_ops
);
3628 add_set_cmd ("timeout", no_class
, var_zinteger
,
3629 (char *) &mips_receive_wait
,
3630 "Set timeout in seconds for remote MIPS serial I/O.",
3635 add_set_cmd ("retransmit-timeout", no_class
, var_zinteger
,
3636 (char *) &mips_retransmit_wait
,
3637 "Set retransmit timeout in seconds for remote MIPS serial I/O.\n\
3638 This is the number of seconds to wait for an acknowledgement to a packet\n\
3639 before resending the packet.", &setlist
),
3643 add_set_cmd ("syn-garbage-limit", no_class
, var_zinteger
,
3644 (char *) &mips_syn_garbage
,
3645 "Set the maximum number of characters to ignore when scanning for a SYN.\n\
3646 This is the maximum number of characters GDB will ignore when trying to\n\
3647 synchronize with the remote system. A value of -1 means that there is no limit\n\
3648 (Note that these characters are printed out even though they are ignored.)",
3653 (add_set_cmd ("monitor-prompt", class_obscure
, var_string
,
3654 (char *) &mips_monitor_prompt
,
3655 "Set the prompt that GDB expects from the monitor.",
3660 add_set_cmd ("monitor-warnings", class_obscure
, var_zinteger
,
3661 (char *) &monitor_warnings
,
3662 "Set printing of monitor warnings.\n"
3663 "When enabled, monitor warnings about hardware breakpoints "
3664 "will be displayed.",
3668 add_com ("pmon <command>", class_obscure
, pmon_command
,
3669 "Send a packet to PMON (must be in debug mode).");