1 /* Remote target communications for serial-line targets in custom GDB protocol
2 Copyright 1988, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* Remote communication protocol.
22 A debug packet whose contents are <data>
23 is encapsulated for transmission in the form:
25 $ <data> # CSUM1 CSUM2
27 <data> must be ASCII alphanumeric and cannot include characters
28 '$' or '#'. If <data> starts with two characters followed by
29 ':', then the existing stubs interpret this as a sequence number.
31 CSUM1 and CSUM2 are ascii hex representation of an 8-bit
32 checksum of <data>, the most significant nibble is sent first.
33 the hex digits 0-9,a-f are used.
35 Receiver responds with:
37 + - if CSUM is correct and ready for next packet
38 - - if CSUM is incorrect
41 All values are encoded in ascii hex digits.
46 reply XX....X Each byte of register data
47 is described by two hex digits.
48 Registers are in the internal order
49 for GDB, and the bytes in a register
50 are in the same order the machine uses.
53 write regs GXX..XX Each byte of register data
54 is described by two hex digits.
58 write reg Pn...=r... Write register n... with value r...,
59 which contains two hex digits for each
60 byte in the register (target byte
64 (not supported by all stubs).
66 read mem mAA..AA,LLLL AA..AA is address, LLLL is length.
67 reply XX..XX XX..XX is mem contents
68 Can be fewer bytes than requested
69 if able to read only part of the data.
72 write mem MAA..AA,LLLL:XX..XX
74 LLLL is number of bytes,
77 ENN for an error (this includes the case
78 where only part of the data was
81 cont cAA..AA AA..AA is address to resume
83 resume at same address.
85 step sAA..AA AA..AA is address to resume
87 resume at same address.
89 last signal ? Reply the current reason for stopping.
90 This is the same reply as is generated
91 for step or cont : SAA where AA is the
94 There is no immediate reply to step or cont.
95 The reply comes when the machine stops.
96 It is SAA AA is the "signal number"
98 or... TAAn...:r...;n:r...;n...:r...;
100 n... = register number
101 r... = register contents
102 or... WAA The process exited, and AA is
103 the exit status. This is only
104 applicable for certains sorts of
108 toggle debug d toggle debug flag (see 386 & 68k stubs)
109 reset r reset -- see sparc stub.
110 reserved <other> On other requests, the stub should
111 ignore the request and send an empty
112 response ($#<checksum>). This way
113 we can extend the protocol and GDB
114 can tell whether the stub it is
115 talking to uses the old or the new.
116 search tAA:PP,MM Search backwards starting at address
117 AA for a match with pattern PP and
118 mask MM. PP and MM are 4 bytes.
119 Not supported by all stubs.
121 general query qXXXX Request info about XXXX.
122 general set QXXXX=yyyy Set value of XXXX to yyyy.
123 query sect offs qOffsets Get section offsets. Reply is
124 Text=xxx;Data=yyy;Bss=zzz
126 Responses can be run-length encoded to save space. A '*' means that
127 the next two characters are hex digits giving a repeat count which
128 stands for that many repititions of the character preceding the '*'.
129 Note that this means that responses cannot contain '*'. Example:
130 "0*03" means the same as "0000". */
136 #include "inferior.h"
141 #include "terminal.h"
143 #include "objfiles.h"
144 #include "gdb-stabs.h"
148 #if !defined(DONT_USE_REMOTE)
150 #include <sys/types.h>
156 /* Prototypes for local functions */
159 remote_write_bytes
PARAMS ((CORE_ADDR memaddr
, unsigned char *myaddr
, int len
));
162 remote_read_bytes
PARAMS ((CORE_ADDR memaddr
, unsigned char *myaddr
, int len
));
165 remote_files_info
PARAMS ((struct target_ops
*ignore
));
168 remote_xfer_memory
PARAMS ((CORE_ADDR memaddr
, char *myaddr
, int len
,
169 int should_write
, struct target_ops
*target
));
172 remote_prepare_to_store
PARAMS ((void));
175 remote_fetch_registers
PARAMS ((int regno
));
178 remote_resume
PARAMS ((int pid
, int step
, enum target_signal siggnal
));
181 remote_start_remote
PARAMS ((char *dummy
));
184 remote_open
PARAMS ((char *name
, int from_tty
));
187 remote_close
PARAMS ((int quitting
));
190 remote_store_registers
PARAMS ((int regno
));
193 getpkt
PARAMS ((char *buf
, int forever
));
196 putpkt
PARAMS ((char *buf
));
199 remote_send
PARAMS ((char *buf
));
202 readchar
PARAMS ((void));
204 static int remote_wait
PARAMS ((int pid
, struct target_waitstatus
*status
));
207 tohex
PARAMS ((int nib
));
210 fromhex
PARAMS ((int a
));
213 remote_detach
PARAMS ((char *args
, int from_tty
));
216 remote_interrupt
PARAMS ((int signo
));
219 remote_interrupt_twice
PARAMS ((int signo
));
222 interrupt_query
PARAMS ((void));
224 extern struct target_ops remote_ops
; /* Forward decl */
226 /* This was 5 seconds, which is a long time to sit and wait.
227 Unless this is going though some terminal server or multiplexer or
228 other form of hairy serial connection, I would think 2 seconds would
230 static int timeout
= 2;
236 /* Descriptor for I/O to remote machine. Initialize it to NULL so that
237 remote_open knows that we don't have a file open when the program
239 serial_t remote_desc
= NULL
;
241 /* Having this larger than 400 causes us to be incompatible with m68k-stub.c
242 and i386-stub.c. Normally, no one would notice because it only matters
243 for writing large chunks of memory (e.g. in downloads). Also, this needs
244 to be more than 400 if required to hold the registers (see below, where
245 we round it up based on REGISTER_BYTES). */
248 /* Maximum number of bytes to read/write at once. The value here
249 is chosen to fill up a packet (the headers account for the 32). */
250 #define MAXBUFBYTES ((PBUFSIZ-32)/2)
252 /* Round up PBUFSIZ to hold all the registers, at least. */
253 /* The blank line after the #if seems to be required to work around a
254 bug in HP's PA compiler. */
255 #if REGISTER_BYTES > MAXBUFBYTES
258 #define PBUFSIZ (REGISTER_BYTES * 2 + 32)
261 /* Should we try the 'P' request? If this is set to one when the stub
262 doesn't support 'P', the only consequence is some unnecessary traffic. */
263 static int stub_supports_P
= 1;
266 /* Clean up connection to a remote debugger. */
270 remote_close (quitting
)
274 SERIAL_CLOSE (remote_desc
);
278 /* Query the remote side for the text, data and bss offsets. */
283 unsigned char buf
[PBUFSIZ
];
285 CORE_ADDR text_addr
, data_addr
, bss_addr
;
286 struct section_offsets
*offs
;
294 warning ("Remote failure reply: %s", buf
);
298 nvals
= sscanf (buf
, "Text=%lx;Data=%lx;Bss=%lx", &text_addr
, &data_addr
,
301 error ("Malformed response to offset query, %s", buf
);
303 if (symfile_objfile
== NULL
)
306 offs
= (struct section_offsets
*) alloca (sizeof (struct section_offsets
)
307 + symfile_objfile
->num_sections
308 * sizeof (offs
->offsets
));
309 memcpy (offs
, symfile_objfile
->section_offsets
,
310 sizeof (struct section_offsets
)
311 + symfile_objfile
->num_sections
312 * sizeof (offs
->offsets
));
314 /* FIXME: This code assumes gdb-stabs.h is being used; it's broken
315 for xcoff, dwarf, sdb-coff, etc. But there is no simple
316 canonical representation for this stuff. (Just what does "text"
317 as seen by the stub mean, anyway? I think it means all sections
318 with SEC_CODE set, but we currently have no way to deal with that). */
320 ANOFFSET (offs
, SECT_OFF_TEXT
) = text_addr
;
321 ANOFFSET (offs
, SECT_OFF_DATA
) = data_addr
;
322 ANOFFSET (offs
, SECT_OFF_BSS
) = bss_addr
;
324 objfile_relocate (symfile_objfile
, offs
);
327 /* Stub for catch_errors. */
330 remote_start_remote (dummy
)
333 immediate_quit
= 1; /* Allow user to interrupt it */
335 /* Ack any packet which the remote side has already sent. */
337 SERIAL_WRITE (remote_desc
, "+", 1);
339 get_offsets (); /* Get text, data & bss offsets */
341 putpkt ("?"); /* initiate a query from remote machine */
344 start_remote (); /* Initialize gdb process mechanisms */
349 /* Open a connection to a remote debugger.
350 NAME is the filename used for communication. */
352 static DCACHE
*remote_dcache
;
355 remote_open (name
, from_tty
)
361 "To open a remote debug connection, you need to specify what serial\n\
362 device is attached to the remote system (e.g. /dev/ttya).");
364 target_preopen (from_tty
);
366 unpush_target (&remote_ops
);
368 remote_dcache
= dcache_init (remote_read_bytes
, remote_write_bytes
);
370 remote_desc
= SERIAL_OPEN (name
);
372 perror_with_name (name
);
376 if (SERIAL_SETBAUDRATE (remote_desc
, baud_rate
))
378 SERIAL_CLOSE (remote_desc
);
379 perror_with_name (name
);
383 SERIAL_RAW (remote_desc
);
385 /* If there is something sitting in the buffer we might take it as a
386 response to a command, which would be bad. */
387 SERIAL_FLUSH_INPUT (remote_desc
);
391 puts_filtered ("Remote debugging using ");
392 puts_filtered (name
);
393 puts_filtered ("\n");
395 push_target (&remote_ops
); /* Switch to using remote target now */
397 /* Start out by trying the 'P' request to set registers. We set this each
398 time that we open a new target so that if the user switches from one
399 stub to another, we can (if the target is closed and reopened) cope. */
402 /* Start the remote connection; if error (0), discard this target.
403 In particular, if the user quits, be sure to discard it
404 (we'd be in an inconsistent state otherwise). */
405 if (!catch_errors (remote_start_remote
, (char *)0,
406 "Couldn't establish connection to remote target\n", RETURN_MASK_ALL
))
411 takes a program previously attached to and detaches it.
412 We better not have left any breakpoints
413 in the program or it'll die when it hits one.
414 Close the open connection to the remote debugger.
415 Use this when you want to detach and do something else
419 remote_detach (args
, from_tty
)
424 error ("Argument given to \"detach\" when remotely debugging.");
428 puts_filtered ("Ending remote debugging.\n");
431 /* Convert hex digit A to a number. */
437 if (a
>= '0' && a
<= '9')
439 else if (a
>= 'a' && a
<= 'f')
442 error ("Reply contains invalid hex digit");
446 /* Convert number NIB to a hex digit. */
458 /* Tell the remote machine to resume. */
461 remote_resume (pid
, step
, siggnal
)
463 enum target_signal siggnal
;
470 target_terminal_ours_for_output ();
472 ("Can't send signals to a remote system. %s not sent.\n",
473 target_signal_to_name (siggnal
));
474 target_terminal_inferior ();
477 dcache_flush (remote_dcache
);
479 strcpy (buf
, step
? "s": "c");
484 /* Send ^C to target to halt it. Target will respond, and send us a
488 remote_interrupt (signo
)
491 /* If this doesn't work, try more severe steps. */
492 signal (signo
, remote_interrupt_twice
);
495 printf_unfiltered ("remote_interrupt called\n");
497 SERIAL_WRITE (remote_desc
, "\003", 1); /* Send a ^C */
500 static void (*ofunc
)();
502 /* The user typed ^C twice. */
504 remote_interrupt_twice (signo
)
507 signal (signo
, ofunc
);
511 signal (signo
, remote_interrupt
);
514 /* Ask the user what to do when an interrupt is received. */
519 target_terminal_ours ();
521 if (query ("Interrupted while waiting for the program.\n\
522 Give up (and stop debugging it)? "))
524 target_mourn_inferior ();
525 return_to_top_level (RETURN_QUIT
);
528 target_terminal_inferior ();
531 /* Wait until the remote machine stops, then return,
532 storing status in STATUS just as `wait' would.
533 Returns "pid" (though it's not clear what, if anything, that
534 means in the case of this target). */
537 remote_wait (pid
, status
)
539 struct target_waitstatus
*status
;
541 unsigned char buf
[PBUFSIZ
];
543 status
->kind
= TARGET_WAITKIND_EXITED
;
544 status
->value
.integer
= 0;
550 ofunc
= (void (*)()) signal (SIGINT
, remote_interrupt
);
551 getpkt ((char *) buf
, 1);
552 signal (SIGINT
, ofunc
);
555 warning ("Remote failure reply: %s", buf
);
556 else if (buf
[0] == 'T')
560 char regs
[MAX_REGISTER_RAW_SIZE
];
562 /* Expedited reply, containing Signal, {regno, reg} repeat */
563 /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where
565 n... = register number
566 r... = register contents
569 p
= &buf
[3]; /* after Txx */
575 regno
= strtol (p
, &p1
, 16); /* Read the register number */
578 warning ("Remote sent badly formed register number: %s\nPacket: '%s'\n",
584 warning ("Malformed packet (missing colon): %s\nPacket: '%s'\n",
587 if (regno
>= NUM_REGS
)
588 warning ("Remote sent bad register number %d: %s\nPacket: '%s'\n",
591 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
++)
593 if (p
[0] == 0 || p
[1] == 0)
594 warning ("Remote reply is too short: %s", buf
);
595 regs
[i
] = fromhex (p
[0]) * 16 + fromhex (p
[1]);
600 warning ("Remote register badly formatted: %s", buf
);
602 supply_register (regno
, regs
);
606 else if (buf
[0] == 'W')
608 /* The remote process exited. */
609 status
->kind
= TARGET_WAITKIND_EXITED
;
610 status
->value
.integer
= (fromhex (buf
[1]) << 4) + fromhex (buf
[2]);
613 else if (buf
[0] == 'S')
616 warning ("Invalid remote reply: %s", buf
);
619 status
->kind
= TARGET_WAITKIND_STOPPED
;
620 status
->value
.sig
= (enum target_signal
)
621 (((fromhex (buf
[1])) << 4) + (fromhex (buf
[2])));
626 /* Number of bytes of registers this stub implements. */
627 static int register_bytes_found
;
629 /* Read the remote registers into the block REGS. */
630 /* Currently we just read all the registers, so we don't use regno. */
633 remote_fetch_registers (regno
)
639 char regs
[REGISTER_BYTES
];
644 /* Unimplemented registers read as all bits zero. */
645 memset (regs
, 0, REGISTER_BYTES
);
647 /* We can get out of synch in various cases. If the first character
648 in the buffer is not a hex character, assume that has happened
649 and try to fetch another packet to read. */
650 while ((buf
[0] < '0' || buf
[0] > '9')
651 && (buf
[0] < 'a' || buf
[0] > 'f'))
654 printf_unfiltered ("Bad register packet; fetching a new packet\n");
658 /* Reply describes registers byte by byte, each byte encoded as two
659 hex characters. Suck them all up, then supply them to the
660 register cacheing/storage mechanism. */
663 for (i
= 0; i
< REGISTER_BYTES
; i
++)
669 warning ("Remote reply is of odd length: %s", buf
);
670 /* Don't change register_bytes_found in this case, and don't
671 print a second warning. */
674 regs
[i
] = fromhex (p
[0]) * 16 + fromhex (p
[1]);
678 if (i
!= register_bytes_found
)
680 register_bytes_found
= i
;
681 #ifdef REGISTER_BYTES_OK
682 if (!REGISTER_BYTES_OK (i
))
683 warning ("Remote reply is too short: %s", buf
);
688 for (i
= 0; i
< NUM_REGS
; i
++)
689 supply_register (i
, ®s
[REGISTER_BYTE(i
)]);
692 /* Prepare to store registers. Since we may send them all (using a
693 'G' request), we have to read out the ones we don't want to change
697 remote_prepare_to_store ()
699 /* Make sure the entire registers array is valid. */
700 read_register_bytes (0, (char *)NULL
, REGISTER_BYTES
);
703 /* Store register REGNO, or all registers if REGNO == -1, from the contents
704 of REGISTERS. FIXME: ignores errors. */
707 remote_store_registers (regno
)
714 if (regno
>= 0 && stub_supports_P
)
716 /* Try storing a single register. */
719 sprintf (buf
, "P%x=", regno
);
720 p
= buf
+ strlen (buf
);
721 regp
= ®isters
[REGISTER_BYTE (regno
)];
722 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); ++i
)
724 *p
++ = tohex ((regp
[i
] >> 4) & 0xf);
725 *p
++ = tohex (regp
[i
] & 0xf);
731 /* The stub understands the 'P' request. We are done. */
735 /* The stub does not support the 'P' request. Use 'G' instead,
736 and don't try using 'P' in the future (it will just waste our
743 /* Command describes registers byte by byte,
744 each byte encoded as two hex characters. */
747 /* remote_prepare_to_store insures that register_bytes_found gets set. */
748 for (i
= 0; i
< register_bytes_found
; i
++)
750 *p
++ = tohex ((registers
[i
] >> 4) & 0xf);
751 *p
++ = tohex (registers
[i
] & 0xf);
760 /* Use of the data cache is disabled because it loses for looking at
761 and changing hardware I/O ports and the like. Accepting `volatile'
762 would perhaps be one way to fix it, but a better way which would
763 win for more cases would be to use the executable file for the text
764 segment, like the `icache' code below but done cleanly (in some
765 target-independent place, perhaps in target_xfer_memory, perhaps
766 based on assigning each target a speed or perhaps by some simpler
769 /* Read a word from remote address ADDR and return it.
770 This goes through the data cache. */
773 remote_fetch_word (addr
)
779 extern CORE_ADDR text_start
, text_end
;
781 if (addr
>= text_start
&& addr
< text_end
)
784 xfer_core_file (addr
, &buffer
, sizeof (int));
789 return dcache_fetch (remote_dcache
, addr
);
792 /* Write a word WORD into remote address ADDR.
793 This goes through the data cache. */
796 remote_store_word (addr
, word
)
800 dcache_poke (remote_dcache
, addr
, word
);
804 /* Write memory data directly to the remote machine.
805 This does not inform the data cache; the data cache uses this.
806 MEMADDR is the address in the remote memory space.
807 MYADDR is the address of the buffer in our space.
808 LEN is the number of bytes.
810 Returns number of bytes transferred, or 0 for error. */
813 remote_write_bytes (memaddr
, myaddr
, len
)
815 unsigned char *myaddr
;
822 /* FIXME-32x64: Need a version of print_address_numeric which doesn't
823 set use_local (and also puts the result in a buffer like sprintf). */
824 sprintf (buf
, "M%lx,%x:", (unsigned long) memaddr
, len
);
826 /* We send target system values byte by byte, in increasing byte addresses,
827 each byte encoded as two hex characters. */
829 p
= buf
+ strlen (buf
);
830 for (i
= 0; i
< len
; i
++)
832 *p
++ = tohex ((myaddr
[i
] >> 4) & 0xf);
833 *p
++ = tohex (myaddr
[i
] & 0xf);
842 /* There is no correspondance between what the remote protocol uses
843 for errors and errno codes. We would like a cleaner way of
844 representing errors (big enough to include errno codes, bfd_error
845 codes, and others). But for now just return EIO. */
852 /* Read memory data directly from the remote machine.
853 This does not use the data cache; the data cache uses this.
854 MEMADDR is the address in the remote memory space.
855 MYADDR is the address of the buffer in our space.
856 LEN is the number of bytes.
858 Returns number of bytes transferred, or 0 for error. */
861 remote_read_bytes (memaddr
, myaddr
, len
)
863 unsigned char *myaddr
;
870 if (len
> PBUFSIZ
/ 2 - 1)
873 /* FIXME-32x64: Need a version of print_address_numeric which doesn't
874 set use_local (and also puts the result in a buffer like sprintf). */
875 sprintf (buf
, "m%lx,%x", (unsigned long) memaddr
, len
);
881 /* There is no correspondance between what the remote protocol uses
882 for errors and errno codes. We would like a cleaner way of
883 representing errors (big enough to include errno codes, bfd_error
884 codes, and others). But for now just return EIO. */
889 /* Reply describes memory byte by byte,
890 each byte encoded as two hex characters. */
893 for (i
= 0; i
< len
; i
++)
895 if (p
[0] == 0 || p
[1] == 0)
896 /* Reply is short. This means that we were able to read only part
897 of what we wanted to. */
899 myaddr
[i
] = fromhex (p
[0]) * 16 + fromhex (p
[1]);
905 /* Read or write LEN bytes from inferior memory at MEMADDR, transferring
906 to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is
907 nonzero. Returns length of data written or read; 0 for error. */
911 remote_xfer_memory(memaddr
, myaddr
, len
, should_write
, target
)
916 struct target_ops
*target
; /* ignored */
920 int total_xferred
= 0;
924 if (len
> MAXBUFBYTES
)
925 xfersize
= MAXBUFBYTES
;
930 bytes_xferred
= remote_write_bytes (memaddr
,
931 (unsigned char *)myaddr
, xfersize
);
933 bytes_xferred
= remote_read_bytes (memaddr
,
934 (unsigned char *)myaddr
, xfersize
);
936 /* If we get an error, we are done xferring. */
937 if (bytes_xferred
== 0)
940 memaddr
+= bytes_xferred
;
941 myaddr
+= bytes_xferred
;
942 len
-= bytes_xferred
;
943 total_xferred
+= bytes_xferred
;
945 return total_xferred
;
949 /* Enable after 4.12. */
952 remote_search (len
, data
, mask
, startaddr
, increment
, lorange
, hirange
953 addr_found
, data_found
)
961 CORE_ADDR
*addr_found
;
964 if (increment
== -4 && len
== 4)
966 long mask_long
, data_long
;
967 long data_found_long
;
968 CORE_ADDR addr_we_found
;
970 long returned_long
[2];
973 mask_long
= extract_unsigned_integer (mask
, len
);
974 data_long
= extract_unsigned_integer (data
, len
);
975 sprintf (buf
, "t%x:%x,%x", startaddr
, data_long
, mask_long
);
980 /* The stub doesn't support the 't' request. We might want to
981 remember this fact, but on the other hand the stub could be
982 switched on us. Maybe we should remember it only until
983 the next "target remote". */
984 generic_search (len
, data
, mask
, startaddr
, increment
, lorange
,
985 hirange
, addr_found
, data_found
);
990 /* There is no correspondance between what the remote protocol uses
991 for errors and errno codes. We would like a cleaner way of
992 representing errors (big enough to include errno codes, bfd_error
993 codes, and others). But for now just use EIO. */
994 memory_error (EIO
, startaddr
);
997 while (*p
!= '\0' && *p
!= ',')
998 addr_we_found
= (addr_we_found
<< 4) + fromhex (*p
++);
1000 error ("Protocol error: short return for search");
1002 data_found_long
= 0;
1003 while (*p
!= '\0' && *p
!= ',')
1004 data_found_long
= (data_found_long
<< 4) + fromhex (*p
++);
1005 /* Ignore anything after this comma, for future extensions. */
1007 if (addr_we_found
< lorange
|| addr_we_found
>= hirange
)
1013 *addr_found
= addr_we_found
;
1014 *data_found
= store_unsigned_integer (data_we_found
, len
);
1017 generic_search (len
, data
, mask
, startaddr
, increment
, lorange
,
1018 hirange
, addr_found
, data_found
);
1023 remote_files_info (ignore
)
1024 struct target_ops
*ignore
;
1026 puts_filtered ("Debugging a target over a serial line.\n");
1029 /* Stuff for dealing with the packets which are part of this protocol.
1030 See comment at top of file for details. */
1032 /* Read a single character from the remote end, masking it down to 7 bits. */
1039 ch
= SERIAL_READCHAR (remote_desc
, timeout
);
1047 /* Send the command in BUF to the remote machine,
1048 and read the reply into BUF.
1049 Report an error if we get an error reply. */
1060 error ("Remote failure reply: %s", buf
);
1063 /* Send a packet to the remote machine, with error checking.
1064 The data of the packet is in BUF. */
1071 unsigned char csum
= 0;
1073 int cnt
= strlen (buf
);
1077 /* Copy the packet into buffer BUF2, encapsulating it
1078 and giving it a checksum. */
1080 if (cnt
> sizeof(buf2
) - 5) /* Prosanity check */
1086 for (i
= 0; i
< cnt
; i
++)
1092 *p
++ = tohex ((csum
>> 4) & 0xf);
1093 *p
++ = tohex (csum
& 0xf);
1095 /* Send it over and over until we get a positive ack. */
1102 printf_unfiltered ("Sending packet: %s...", buf2
); gdb_flush(gdb_stdout
);
1104 if (SERIAL_WRITE (remote_desc
, buf2
, p
- buf2
))
1105 perror_with_name ("putpkt: write failed");
1107 /* read until either a timeout occurs (-2) or '+' is read */
1116 printf_unfiltered("Ack\n");
1118 case SERIAL_TIMEOUT
:
1119 break; /* Retransmit buffer */
1121 perror_with_name ("putpkt: couldn't read ACK");
1123 error ("putpkt: EOF while trying to read ACK");
1126 printf_unfiltered ("%02X %c ", ch
&0xFF, ch
);
1129 break; /* Here to retransmit */
1133 /* This is wrong. If doing a long backtrace, the user should be
1134 able to get out next time we call QUIT, without anything as violent
1135 as interrupt_query. If we want to provide a way out of here
1136 without getting to the next QUIT, it should be based on hitting
1137 ^C twice as in remote_wait. */
1147 /* Read a packet from the remote machine, with error checking,
1148 and store it in BUF. BUF is expected to be of size PBUFSIZ.
1149 If FOREVER, wait forever rather than timing out; this is used
1150 while the target is executing user code. */
1153 getpkt (retbuf
, forever
)
1160 unsigned char c1
, c2
;
1164 #define MAX_RETRIES 10
1169 /* This is wrong. If doing a long backtrace, the user should be
1170 able to get out time next we call QUIT, without anything as violent
1171 as interrupt_query. If we want to provide a way out of here
1172 without getting to the next QUIT, it should be based on hitting
1173 ^C twice as in remote_wait. */
1181 /* This can loop forever if the remote side sends us characters
1182 continuously, but if it pauses, we'll get a zero from readchar
1183 because of timeout. Then we'll count that as a retry. */
1186 if (c
> 0 && c
!= '$')
1189 if (c
== SERIAL_TIMEOUT
)
1194 puts_filtered ("Timed out.\n");
1198 if (c
== SERIAL_EOF
)
1199 error ("Remote connection closed");
1200 if (c
== SERIAL_ERROR
)
1201 perror_with_name ("Remote communication error");
1203 /* Force csum to be zero here because of possible error retry. */
1210 if (c
== SERIAL_TIMEOUT
)
1213 puts_filtered ("Timeout in mid-packet, retrying\n");
1214 goto whole
; /* Start a new packet, count retries */
1219 puts_filtered ("Saw new packet start in middle of old one\n");
1220 goto whole
; /* Start a new packet, count retries */
1224 if (bp
>= buf
+PBUFSIZ
-1)
1227 puts_filtered ("Remote packet too long: ");
1228 puts_filtered (buf
);
1229 puts_filtered ("\n");
1237 c1
= fromhex (readchar ());
1238 c2
= fromhex (readchar ());
1239 if ((csum
& 0xff) == (c1
<< 4) + c2
)
1241 printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=",
1242 (c1
<< 4) + c2
, csum
& 0xff);
1243 puts_filtered (buf
);
1244 puts_filtered ("\n");
1246 /* Try the whole thing again. */
1248 if (++retries
< MAX_RETRIES
)
1250 SERIAL_WRITE (remote_desc
, "-", 1);
1254 printf_unfiltered ("Ignoring packet error, continuing...\n");
1259 /* Deal with run-length encoding. */
1262 char *dest
= retbuf
;
1268 if (src
[1] == '\0' || src
[2] == '\0')
1271 puts_filtered ("Packet too short, retrying\n");
1274 repeat
= (fromhex (src
[1]) << 4) + fromhex (src
[2]);
1275 for (i
= 0; i
< repeat
; ++i
)
1285 } while (*src
++ != '\0');
1288 SERIAL_WRITE (remote_desc
, "+", 1);
1291 fprintf_unfiltered (gdb_stderr
,"Packet received: %s\n", buf
);
1298 /* Don't wait for it to die. I'm not really sure it matters whether
1299 we do or not. For the existing stubs, kill is a noop. */
1300 target_mourn_inferior ();
1306 unpush_target (&remote_ops
);
1307 generic_mourn_inferior ();
1310 #ifdef REMOTE_BREAKPOINT
1312 /* On some machines, e.g. 68k, we may use a different breakpoint instruction
1313 than other targets. */
1314 static unsigned char break_insn
[] = REMOTE_BREAKPOINT
;
1316 /* Check that it fits in BREAKPOINT_MAX bytes. */
1317 static unsigned char check_break_insn_size
[BREAKPOINT_MAX
] = REMOTE_BREAKPOINT
;
1319 #else /* No REMOTE_BREAKPOINT. */
1321 /* Same old breakpoint instruction. This code does nothing different
1322 than mem-break.c. */
1323 static unsigned char break_insn
[] = BREAKPOINT
;
1325 #endif /* No REMOTE_BREAKPOINT. */
1327 /* Insert a breakpoint on targets that don't have any better breakpoint
1328 support. We read the contents of the target location and stash it,
1329 then overwrite it with a breakpoint instruction. ADDR is the target
1330 location in the target machine. CONTENTS_CACHE is a pointer to
1331 memory allocated for saving the target contents. It is guaranteed
1332 by the caller to be long enough to save sizeof BREAKPOINT bytes (this
1333 is accomplished via BREAKPOINT_MAX). */
1336 remote_insert_breakpoint (addr
, contents_cache
)
1338 char *contents_cache
;
1342 val
= target_read_memory (addr
, contents_cache
, sizeof break_insn
);
1345 val
= target_write_memory (addr
, (char *)break_insn
, sizeof break_insn
);
1351 remote_remove_breakpoint (addr
, contents_cache
)
1353 char *contents_cache
;
1355 return target_write_memory (addr
, contents_cache
, sizeof break_insn
);
1358 /* Define the target subroutine names */
1360 struct target_ops remote_ops
= {
1361 "remote", /* to_shortname */
1362 "Remote serial target in gdb-specific protocol", /* to_longname */
1363 "Use a remote computer via a serial line, using a gdb-specific protocol.\n\
1364 Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */
1365 remote_open
, /* to_open */
1366 remote_close
, /* to_close */
1367 NULL
, /* to_attach */
1368 remote_detach
, /* to_detach */
1369 remote_resume
, /* to_resume */
1370 remote_wait
, /* to_wait */
1371 remote_fetch_registers
, /* to_fetch_registers */
1372 remote_store_registers
, /* to_store_registers */
1373 remote_prepare_to_store
, /* to_prepare_to_store */
1374 remote_xfer_memory
, /* to_xfer_memory */
1375 remote_files_info
, /* to_files_info */
1377 remote_insert_breakpoint
, /* to_insert_breakpoint */
1378 remote_remove_breakpoint
, /* to_remove_breakpoint */
1380 NULL
, /* to_terminal_init */
1381 NULL
, /* to_terminal_inferior */
1382 NULL
, /* to_terminal_ours_for_output */
1383 NULL
, /* to_terminal_ours */
1384 NULL
, /* to_terminal_info */
1385 remote_kill
, /* to_kill */
1386 generic_load
, /* to_load */
1387 NULL
, /* to_lookup_symbol */
1388 NULL
, /* to_create_inferior */
1389 remote_mourn
, /* to_mourn_inferior */
1391 0, /* to_notice_signals */
1392 process_stratum
, /* to_stratum */
1394 1, /* to_has_all_memory */
1395 1, /* to_has_memory */
1396 1, /* to_has_stack */
1397 1, /* to_has_registers */
1398 1, /* to_has_execution */
1399 NULL
, /* sections */
1400 NULL
, /* sections_end */
1401 OPS_MAGIC
/* to_magic */
1403 #endif /* Use remote. */
1406 _initialize_remote ()
1408 #if !defined(DONT_USE_REMOTE)
1409 add_target (&remote_ops
);
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