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 #if REGISTER_BYTES > MAXBUFBYTES
255 #define PBUFSIZ (REGISTER_BYTES * 2 + 32)
258 /* Should we try the 'P' request? If this is set to one when the stub
259 doesn't support 'P', the only consequence is some unnecessary traffic. */
260 static int stub_supports_P
= 1;
263 /* Clean up connection to a remote debugger. */
267 remote_close (quitting
)
271 SERIAL_CLOSE (remote_desc
);
275 /* Query the remote side for the text, data and bss offsets. */
280 unsigned char buf
[PBUFSIZ
];
282 CORE_ADDR text_addr
, data_addr
, bss_addr
;
283 struct section_offsets
*offs
;
291 warning ("Remote failure reply: %s", buf
);
295 nvals
= sscanf (buf
, "Text=%lx;Data=%lx;Bss=%lx", &text_addr
, &data_addr
,
298 error ("Malformed response to offset query, %s", buf
);
300 if (symfile_objfile
== NULL
)
303 offs
= (struct section_offsets
*) alloca (sizeof (struct section_offsets
)
304 + symfile_objfile
->num_sections
305 * sizeof (offs
->offsets
));
306 memcpy (offs
, symfile_objfile
->section_offsets
,
307 sizeof (struct section_offsets
)
308 + symfile_objfile
->num_sections
309 * sizeof (offs
->offsets
));
311 /* FIXME: This code assumes gdb-stabs.h is being used; it's broken
312 for xcoff, dwarf, sdb-coff, etc. But there is no simple
313 canonical representation for this stuff. (Just what does "text"
314 as seen by the stub mean, anyway? I think it means all sections
315 with SEC_CODE set, but we currently have no way to deal with that). */
317 ANOFFSET (offs
, SECT_OFF_TEXT
) = text_addr
;
318 ANOFFSET (offs
, SECT_OFF_DATA
) = data_addr
;
319 ANOFFSET (offs
, SECT_OFF_BSS
) = bss_addr
;
321 objfile_relocate (symfile_objfile
, offs
);
324 /* Stub for catch_errors. */
327 remote_start_remote (dummy
)
330 immediate_quit
= 1; /* Allow user to interrupt it */
332 /* Ack any packet which the remote side has already sent. */
334 SERIAL_WRITE (remote_desc
, "+", 1);
336 get_offsets (); /* Get text, data & bss offsets */
338 putpkt ("?"); /* initiate a query from remote machine */
341 start_remote (); /* Initialize gdb process mechanisms */
346 /* Open a connection to a remote debugger.
347 NAME is the filename used for communication. */
349 static DCACHE
*remote_dcache
;
352 remote_open (name
, from_tty
)
358 "To open a remote debug connection, you need to specify what serial\n\
359 device is attached to the remote system (e.g. /dev/ttya).");
361 target_preopen (from_tty
);
363 unpush_target (&remote_ops
);
365 remote_dcache
= dcache_init (remote_read_bytes
, remote_write_bytes
);
367 remote_desc
= SERIAL_OPEN (name
);
369 perror_with_name (name
);
373 if (SERIAL_SETBAUDRATE (remote_desc
, baud_rate
))
375 SERIAL_CLOSE (remote_desc
);
376 perror_with_name (name
);
380 SERIAL_RAW (remote_desc
);
382 /* If there is something sitting in the buffer we might take it as a
383 response to a command, which would be bad. */
384 SERIAL_FLUSH_INPUT (remote_desc
);
388 puts_filtered ("Remote debugging using ");
389 puts_filtered (name
);
390 puts_filtered ("\n");
392 push_target (&remote_ops
); /* Switch to using remote target now */
394 /* Start out by trying the 'P' request to set registers. We set this each
395 time that we open a new target so that if the user switches from one
396 stub to another, we can (if the target is closed and reopened) cope. */
399 /* Start the remote connection; if error (0), discard this target.
400 In particular, if the user quits, be sure to discard it
401 (we'd be in an inconsistent state otherwise). */
402 if (!catch_errors (remote_start_remote
, (char *)0,
403 "Couldn't establish connection to remote target\n", RETURN_MASK_ALL
))
408 takes a program previously attached to and detaches it.
409 We better not have left any breakpoints
410 in the program or it'll die when it hits one.
411 Close the open connection to the remote debugger.
412 Use this when you want to detach and do something else
416 remote_detach (args
, from_tty
)
421 error ("Argument given to \"detach\" when remotely debugging.");
425 puts_filtered ("Ending remote debugging.\n");
428 /* Convert hex digit A to a number. */
434 if (a
>= '0' && a
<= '9')
436 else if (a
>= 'a' && a
<= 'f')
439 error ("Reply contains invalid hex digit");
443 /* Convert number NIB to a hex digit. */
455 /* Tell the remote machine to resume. */
458 remote_resume (pid
, step
, siggnal
)
460 enum target_signal siggnal
;
467 target_terminal_ours_for_output ();
469 ("Can't send signals to a remote system. %s not sent.\n",
470 target_signal_to_name (siggnal
));
471 target_terminal_inferior ();
474 dcache_flush (remote_dcache
);
476 strcpy (buf
, step
? "s": "c");
481 /* Send ^C to target to halt it. Target will respond, and send us a
485 remote_interrupt (signo
)
488 /* If this doesn't work, try more severe steps. */
489 signal (signo
, remote_interrupt_twice
);
492 printf_unfiltered ("remote_interrupt called\n");
494 SERIAL_WRITE (remote_desc
, "\003", 1); /* Send a ^C */
497 static void (*ofunc
)();
499 /* The user typed ^C twice. */
501 remote_interrupt_twice (signo
)
504 signal (signo
, ofunc
);
508 signal (signo
, remote_interrupt
);
511 /* Ask the user what to do when an interrupt is received. */
516 target_terminal_ours ();
518 if (query ("Interrupted while waiting for the program.\n\
519 Give up (and stop debugging it)? "))
521 target_mourn_inferior ();
522 return_to_top_level (RETURN_QUIT
);
525 target_terminal_inferior ();
528 /* Wait until the remote machine stops, then return,
529 storing status in STATUS just as `wait' would.
530 Returns "pid" (though it's not clear what, if anything, that
531 means in the case of this target). */
534 remote_wait (pid
, status
)
536 struct target_waitstatus
*status
;
538 unsigned char buf
[PBUFSIZ
];
540 status
->kind
= TARGET_WAITKIND_EXITED
;
541 status
->value
.integer
= 0;
547 ofunc
= (void (*)()) signal (SIGINT
, remote_interrupt
);
548 getpkt ((char *) buf
, 1);
549 signal (SIGINT
, ofunc
);
552 warning ("Remote failure reply: %s", buf
);
553 else if (buf
[0] == 'T')
557 char regs
[MAX_REGISTER_RAW_SIZE
];
559 /* Expedited reply, containing Signal, {regno, reg} repeat */
560 /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where
562 n... = register number
563 r... = register contents
566 p
= &buf
[3]; /* after Txx */
572 regno
= strtol (p
, &p1
, 16); /* Read the register number */
575 warning ("Remote sent badly formed register number: %s\nPacket: '%s'\n",
581 warning ("Malformed packet (missing colon): %s\nPacket: '%s'\n",
584 if (regno
>= NUM_REGS
)
585 warning ("Remote sent bad register number %d: %s\nPacket: '%s'\n",
588 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); i
++)
590 if (p
[0] == 0 || p
[1] == 0)
591 warning ("Remote reply is too short: %s", buf
);
592 regs
[i
] = fromhex (p
[0]) * 16 + fromhex (p
[1]);
597 warning ("Remote register badly formatted: %s", buf
);
599 supply_register (regno
, regs
);
603 else if (buf
[0] == 'W')
605 /* The remote process exited. */
606 status
->kind
= TARGET_WAITKIND_EXITED
;
607 status
->value
.integer
= (fromhex (buf
[1]) << 4) + fromhex (buf
[2]);
610 else if (buf
[0] == 'S')
613 warning ("Invalid remote reply: %s", buf
);
616 status
->kind
= TARGET_WAITKIND_STOPPED
;
617 status
->value
.sig
= (enum target_signal
)
618 (((fromhex (buf
[1])) << 4) + (fromhex (buf
[2])));
623 /* Number of bytes of registers this stub implements. */
624 static int register_bytes_found
;
626 /* Read the remote registers into the block REGS. */
627 /* Currently we just read all the registers, so we don't use regno. */
630 remote_fetch_registers (regno
)
636 char regs
[REGISTER_BYTES
];
641 /* Unimplemented registers read as all bits zero. */
642 memset (regs
, 0, REGISTER_BYTES
);
644 /* We can get out of synch in various cases. If the first character
645 in the buffer is not a hex character, assume that has happened
646 and try to fetch another packet to read. */
647 while ((buf
[0] < '0' || buf
[0] > '9')
648 && (buf
[0] < 'a' || buf
[0] > 'f'))
651 printf_unfiltered ("Bad register packet; fetching a new packet\n");
655 /* Reply describes registers byte by byte, each byte encoded as two
656 hex characters. Suck them all up, then supply them to the
657 register cacheing/storage mechanism. */
660 for (i
= 0; i
< REGISTER_BYTES
; i
++)
666 warning ("Remote reply is of odd length: %s", buf
);
667 /* Don't change register_bytes_found in this case, and don't
668 print a second warning. */
671 regs
[i
] = fromhex (p
[0]) * 16 + fromhex (p
[1]);
675 if (i
!= register_bytes_found
)
677 register_bytes_found
= i
;
678 #ifdef REGISTER_BYTES_OK
679 if (!REGISTER_BYTES_OK (i
))
680 warning ("Remote reply is too short: %s", buf
);
685 for (i
= 0; i
< NUM_REGS
; i
++)
686 supply_register (i
, ®s
[REGISTER_BYTE(i
)]);
689 /* Prepare to store registers. Since we may send them all (using a
690 'G' request), we have to read out the ones we don't want to change
694 remote_prepare_to_store ()
696 /* Make sure the entire registers array is valid. */
697 read_register_bytes (0, (char *)NULL
, REGISTER_BYTES
);
700 /* Store register REGNO, or all registers if REGNO == -1, from the contents
701 of REGISTERS. FIXME: ignores errors. */
704 remote_store_registers (regno
)
711 if (regno
>= 0 && stub_supports_P
)
713 /* Try storing a single register. */
716 sprintf (buf
, "P%x=", regno
);
717 p
= buf
+ strlen (buf
);
718 regp
= ®isters
[REGISTER_BYTE (regno
)];
719 for (i
= 0; i
< REGISTER_RAW_SIZE (regno
); ++i
)
721 *p
++ = tohex ((regp
[i
] >> 4) & 0xf);
722 *p
++ = tohex (regp
[i
] & 0xf);
728 /* The stub understands the 'P' request. We are done. */
732 /* The stub does not support the 'P' request. Use 'G' instead,
733 and don't try using 'P' in the future (it will just waste our
740 /* Command describes registers byte by byte,
741 each byte encoded as two hex characters. */
744 /* remote_prepare_to_store insures that register_bytes_found gets set. */
745 for (i
= 0; i
< register_bytes_found
; i
++)
747 *p
++ = tohex ((registers
[i
] >> 4) & 0xf);
748 *p
++ = tohex (registers
[i
] & 0xf);
757 /* Use of the data cache is disabled because it loses for looking at
758 and changing hardware I/O ports and the like. Accepting `volatile'
759 would perhaps be one way to fix it, but a better way which would
760 win for more cases would be to use the executable file for the text
761 segment, like the `icache' code below but done cleanly (in some
762 target-independent place, perhaps in target_xfer_memory, perhaps
763 based on assigning each target a speed or perhaps by some simpler
766 /* Read a word from remote address ADDR and return it.
767 This goes through the data cache. */
770 remote_fetch_word (addr
)
776 extern CORE_ADDR text_start
, text_end
;
778 if (addr
>= text_start
&& addr
< text_end
)
781 xfer_core_file (addr
, &buffer
, sizeof (int));
786 return dcache_fetch (remote_dcache
, addr
);
789 /* Write a word WORD into remote address ADDR.
790 This goes through the data cache. */
793 remote_store_word (addr
, word
)
797 dcache_poke (remote_dcache
, addr
, word
);
801 /* Write memory data directly to the remote machine.
802 This does not inform the data cache; the data cache uses this.
803 MEMADDR is the address in the remote memory space.
804 MYADDR is the address of the buffer in our space.
805 LEN is the number of bytes.
807 Returns number of bytes transferred, or 0 for error. */
810 remote_write_bytes (memaddr
, myaddr
, len
)
812 unsigned char *myaddr
;
819 /* FIXME-32x64: Need a version of print_address_numeric which doesn't
820 set use_local (and also puts the result in a buffer like sprintf). */
821 sprintf (buf
, "M%lx,%x:", (unsigned long) memaddr
, len
);
823 /* We send target system values byte by byte, in increasing byte addresses,
824 each byte encoded as two hex characters. */
826 p
= buf
+ strlen (buf
);
827 for (i
= 0; i
< len
; i
++)
829 *p
++ = tohex ((myaddr
[i
] >> 4) & 0xf);
830 *p
++ = tohex (myaddr
[i
] & 0xf);
839 /* There is no correspondance between what the remote protocol uses
840 for errors and errno codes. We would like a cleaner way of
841 representing errors (big enough to include errno codes, bfd_error
842 codes, and others). But for now just return EIO. */
849 /* Read memory data directly from the remote machine.
850 This does not use the data cache; the data cache uses this.
851 MEMADDR is the address in the remote memory space.
852 MYADDR is the address of the buffer in our space.
853 LEN is the number of bytes.
855 Returns number of bytes transferred, or 0 for error. */
858 remote_read_bytes (memaddr
, myaddr
, len
)
860 unsigned char *myaddr
;
867 if (len
> PBUFSIZ
/ 2 - 1)
870 /* FIXME-32x64: Need a version of print_address_numeric which doesn't
871 set use_local (and also puts the result in a buffer like sprintf). */
872 sprintf (buf
, "m%lx,%x", (unsigned long) memaddr
, len
);
878 /* There is no correspondance between what the remote protocol uses
879 for errors and errno codes. We would like a cleaner way of
880 representing errors (big enough to include errno codes, bfd_error
881 codes, and others). But for now just return EIO. */
886 /* Reply describes memory byte by byte,
887 each byte encoded as two hex characters. */
890 for (i
= 0; i
< len
; i
++)
892 if (p
[0] == 0 || p
[1] == 0)
893 /* Reply is short. This means that we were able to read only part
894 of what we wanted to. */
896 myaddr
[i
] = fromhex (p
[0]) * 16 + fromhex (p
[1]);
902 /* Read or write LEN bytes from inferior memory at MEMADDR, transferring
903 to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is
904 nonzero. Returns length of data written or read; 0 for error. */
908 remote_xfer_memory(memaddr
, myaddr
, len
, should_write
, target
)
913 struct target_ops
*target
; /* ignored */
917 int total_xferred
= 0;
921 if (len
> MAXBUFBYTES
)
922 xfersize
= MAXBUFBYTES
;
927 bytes_xferred
= remote_write_bytes (memaddr
,
928 (unsigned char *)myaddr
, xfersize
);
930 bytes_xferred
= remote_read_bytes (memaddr
,
931 (unsigned char *)myaddr
, xfersize
);
933 /* If we get an error, we are done xferring. */
934 if (bytes_xferred
== 0)
937 memaddr
+= bytes_xferred
;
938 myaddr
+= bytes_xferred
;
939 len
-= bytes_xferred
;
940 total_xferred
+= bytes_xferred
;
942 return total_xferred
;
946 /* Enable after 4.12. */
949 remote_search (len
, data
, mask
, startaddr
, increment
, lorange
, hirange
950 addr_found
, data_found
)
958 CORE_ADDR
*addr_found
;
961 if (increment
== -4 && len
== 4)
963 long mask_long
, data_long
;
964 long data_found_long
;
965 CORE_ADDR addr_we_found
;
967 long returned_long
[2];
970 mask_long
= extract_unsigned_integer (mask
, len
);
971 data_long
= extract_unsigned_integer (data
, len
);
972 sprintf (buf
, "t%x:%x,%x", startaddr
, data_long
, mask_long
);
977 /* The stub doesn't support the 't' request. We might want to
978 remember this fact, but on the other hand the stub could be
979 switched on us. Maybe we should remember it only until
980 the next "target remote". */
981 generic_search (len
, data
, mask
, startaddr
, increment
, lorange
,
982 hirange
, addr_found
, data_found
);
987 /* There is no correspondance between what the remote protocol uses
988 for errors and errno codes. We would like a cleaner way of
989 representing errors (big enough to include errno codes, bfd_error
990 codes, and others). But for now just use EIO. */
991 memory_error (EIO
, startaddr
);
994 while (*p
!= '\0' && *p
!= ',')
995 addr_we_found
= (addr_we_found
<< 4) + fromhex (*p
++);
997 error ("Protocol error: short return for search");
1000 while (*p
!= '\0' && *p
!= ',')
1001 data_found_long
= (data_found_long
<< 4) + fromhex (*p
++);
1002 /* Ignore anything after this comma, for future extensions. */
1004 if (addr_we_found
< lorange
|| addr_we_found
>= hirange
)
1010 *addr_found
= addr_we_found
;
1011 *data_found
= store_unsigned_integer (data_we_found
, len
);
1014 generic_search (len
, data
, mask
, startaddr
, increment
, lorange
,
1015 hirange
, addr_found
, data_found
);
1020 remote_files_info (ignore
)
1021 struct target_ops
*ignore
;
1023 puts_filtered ("Debugging a target over a serial line.\n");
1026 /* Stuff for dealing with the packets which are part of this protocol.
1027 See comment at top of file for details. */
1029 /* Read a single character from the remote end, masking it down to 7 bits. */
1036 ch
= SERIAL_READCHAR (remote_desc
, timeout
);
1044 /* Send the command in BUF to the remote machine,
1045 and read the reply into BUF.
1046 Report an error if we get an error reply. */
1057 error ("Remote failure reply: %s", buf
);
1060 /* Send a packet to the remote machine, with error checking.
1061 The data of the packet is in BUF. */
1068 unsigned char csum
= 0;
1070 int cnt
= strlen (buf
);
1074 /* Copy the packet into buffer BUF2, encapsulating it
1075 and giving it a checksum. */
1077 if (cnt
> sizeof(buf2
) - 5) /* Prosanity check */
1083 for (i
= 0; i
< cnt
; i
++)
1089 *p
++ = tohex ((csum
>> 4) & 0xf);
1090 *p
++ = tohex (csum
& 0xf);
1092 /* Send it over and over until we get a positive ack. */
1099 printf_unfiltered ("Sending packet: %s...", buf2
); gdb_flush(gdb_stdout
);
1101 if (SERIAL_WRITE (remote_desc
, buf2
, p
- buf2
))
1102 perror_with_name ("putpkt: write failed");
1104 /* read until either a timeout occurs (-2) or '+' is read */
1113 printf_unfiltered("Ack\n");
1115 case SERIAL_TIMEOUT
:
1116 break; /* Retransmit buffer */
1118 perror_with_name ("putpkt: couldn't read ACK");
1120 error ("putpkt: EOF while trying to read ACK");
1123 printf_unfiltered ("%02X %c ", ch
&0xFF, ch
);
1126 break; /* Here to retransmit */
1130 /* This is wrong. If doing a long backtrace, the user should be
1131 able to get out next time we call QUIT, without anything as violent
1132 as interrupt_query. If we want to provide a way out of here
1133 without getting to the next QUIT, it should be based on hitting
1134 ^C twice as in remote_wait. */
1144 /* Read a packet from the remote machine, with error checking,
1145 and store it in BUF. BUF is expected to be of size PBUFSIZ.
1146 If FOREVER, wait forever rather than timing out; this is used
1147 while the target is executing user code. */
1150 getpkt (retbuf
, forever
)
1157 unsigned char c1
, c2
;
1161 #define MAX_RETRIES 10
1166 /* This is wrong. If doing a long backtrace, the user should be
1167 able to get out time next we call QUIT, without anything as violent
1168 as interrupt_query. If we want to provide a way out of here
1169 without getting to the next QUIT, it should be based on hitting
1170 ^C twice as in remote_wait. */
1178 /* This can loop forever if the remote side sends us characters
1179 continuously, but if it pauses, we'll get a zero from readchar
1180 because of timeout. Then we'll count that as a retry. */
1183 if (c
> 0 && c
!= '$')
1186 if (c
== SERIAL_TIMEOUT
)
1191 puts_filtered ("Timed out.\n");
1195 if (c
== SERIAL_EOF
)
1196 error ("Remote connection closed");
1197 if (c
== SERIAL_ERROR
)
1198 perror_with_name ("Remote communication error");
1200 /* Force csum to be zero here because of possible error retry. */
1207 if (c
== SERIAL_TIMEOUT
)
1210 puts_filtered ("Timeout in mid-packet, retrying\n");
1211 goto whole
; /* Start a new packet, count retries */
1216 puts_filtered ("Saw new packet start in middle of old one\n");
1217 goto whole
; /* Start a new packet, count retries */
1221 if (bp
>= buf
+PBUFSIZ
-1)
1224 puts_filtered ("Remote packet too long: ");
1225 puts_filtered (buf
);
1226 puts_filtered ("\n");
1234 c1
= fromhex (readchar ());
1235 c2
= fromhex (readchar ());
1236 if ((csum
& 0xff) == (c1
<< 4) + c2
)
1238 printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=",
1239 (c1
<< 4) + c2
, csum
& 0xff);
1240 puts_filtered (buf
);
1241 puts_filtered ("\n");
1243 /* Try the whole thing again. */
1245 if (++retries
< MAX_RETRIES
)
1247 SERIAL_WRITE (remote_desc
, "-", 1);
1251 printf_unfiltered ("Ignoring packet error, continuing...\n");
1256 /* Deal with run-length encoding. */
1259 char *dest
= retbuf
;
1265 if (src
[1] == '\0' || src
[2] == '\0')
1268 puts_filtered ("Packet too short, retrying\n");
1271 repeat
= (fromhex (src
[1]) << 4) + fromhex (src
[2]);
1272 for (i
= 0; i
< repeat
; ++i
)
1282 } while (*src
++ != '\0');
1286 SERIAL_WRITE (remote_desc
, "+", 1);
1289 fprintf_unfiltered (gdb_stderr
,"Packet received: %s\n", buf
);
1296 /* Don't wait for it to die. I'm not really sure it matters whether
1297 we do or not. For the existing stubs, kill is a noop. */
1298 target_mourn_inferior ();
1304 unpush_target (&remote_ops
);
1305 generic_mourn_inferior ();
1308 #ifdef REMOTE_BREAKPOINT
1310 /* On some machines, e.g. 68k, we may use a different breakpoint instruction
1311 than other targets. */
1312 static unsigned char break_insn
[] = REMOTE_BREAKPOINT
;
1314 /* Check that it fits in BREAKPOINT_MAX bytes. */
1315 static unsigned char check_break_insn_size
[BREAKPOINT_MAX
] = REMOTE_BREAKPOINT
;
1317 #else /* No REMOTE_BREAKPOINT. */
1319 /* Same old breakpoint instruction. This code does nothing different
1320 than mem-break.c. */
1321 static unsigned char break_insn
[] = BREAKPOINT
;
1323 #endif /* No REMOTE_BREAKPOINT. */
1325 /* Insert a breakpoint on targets that don't have any better breakpoint
1326 support. We read the contents of the target location and stash it,
1327 then overwrite it with a breakpoint instruction. ADDR is the target
1328 location in the target machine. CONTENTS_CACHE is a pointer to
1329 memory allocated for saving the target contents. It is guaranteed
1330 by the caller to be long enough to save sizeof BREAKPOINT bytes (this
1331 is accomplished via BREAKPOINT_MAX). */
1334 remote_insert_breakpoint (addr
, contents_cache
)
1336 char *contents_cache
;
1340 val
= target_read_memory (addr
, contents_cache
, sizeof break_insn
);
1343 val
= target_write_memory (addr
, (char *)break_insn
, sizeof break_insn
);
1349 remote_remove_breakpoint (addr
, contents_cache
)
1351 char *contents_cache
;
1353 return target_write_memory (addr
, contents_cache
, sizeof break_insn
);
1356 /* Define the target subroutine names */
1358 struct target_ops remote_ops
= {
1359 "remote", /* to_shortname */
1360 "Remote serial target in gdb-specific protocol", /* to_longname */
1361 "Use a remote computer via a serial line, using a gdb-specific protocol.\n\
1362 Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */
1363 remote_open
, /* to_open */
1364 remote_close
, /* to_close */
1365 NULL
, /* to_attach */
1366 remote_detach
, /* to_detach */
1367 remote_resume
, /* to_resume */
1368 remote_wait
, /* to_wait */
1369 remote_fetch_registers
, /* to_fetch_registers */
1370 remote_store_registers
, /* to_store_registers */
1371 remote_prepare_to_store
, /* to_prepare_to_store */
1372 remote_xfer_memory
, /* to_xfer_memory */
1373 remote_files_info
, /* to_files_info */
1375 remote_insert_breakpoint
, /* to_insert_breakpoint */
1376 remote_remove_breakpoint
, /* to_remove_breakpoint */
1378 NULL
, /* to_terminal_init */
1379 NULL
, /* to_terminal_inferior */
1380 NULL
, /* to_terminal_ours_for_output */
1381 NULL
, /* to_terminal_ours */
1382 NULL
, /* to_terminal_info */
1383 remote_kill
, /* to_kill */
1384 generic_load
, /* to_load */
1385 NULL
, /* to_lookup_symbol */
1386 NULL
, /* to_create_inferior */
1387 remote_mourn
, /* to_mourn_inferior */
1389 0, /* to_notice_signals */
1390 process_stratum
, /* to_stratum */
1392 1, /* to_has_all_memory */
1393 1, /* to_has_memory */
1394 1, /* to_has_stack */
1395 1, /* to_has_registers */
1396 1, /* to_has_execution */
1397 NULL
, /* sections */
1398 NULL
, /* sections_end */
1399 OPS_MAGIC
/* to_magic */
1401 #endif /* Use remote. */
1404 _initialize_remote ()
1406 #if !defined(DONT_USE_REMOTE)
1407 add_target (&remote_ops
);
This page took 0.059383 seconds and 5 git commands to generate.