1 /* Remote debugging interface for AMD 29000 EBMON on IBM PC, for GDB.
2 Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
3 Contributed by Cygnus Support. Written by Jim Kingdon for Cygnus.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* This is like remote.c but is for an esoteric situation--
22 having a a29k board in a PC hooked up to a unix machine with
23 a serial line, and running ctty com1 on the PC, through which
24 the unix machine can run ebmon. Not to mention that the PC
25 has PC/NFS, so it can access the same executables that gdb can,
26 over the net in real time. */
44 extern struct target_ops eb_ops
; /* Forward declaration */
46 static void eb_close();
48 #define LOG_FILE "eb.log"
49 #if defined (LOG_FILE)
53 static int timeout
= 24;
55 /* Descriptor for I/O to remote machine. Initialize it to -1 so that
56 eb_open knows that we don't have a file open when the program
60 /* stream which is fdopen'd from eb_desc. Only valid when
64 /* Read a character from the remote system, doing all the fancy
73 /* termio does the timeout for us. */
74 read (eb_desc
, &buf
, 1);
77 if (read (eb_desc
, &buf
, 1) < 0)
80 error ("Timeout reading from remote system.");
82 perror_with_name ("remote");
88 error ("Timeout reading from remote system.");
89 #if defined (LOG_FILE)
90 putc (buf
& 0x7f, log_file
);
95 /* Keep discarding input from the remote system, until STRING is found.
96 Let the user break out immediately. */
106 if (readchar() == *p
)
120 /* Keep discarding input until we see the ebmon prompt.
122 The convention for dealing with the prompt is that you
124 o *then* wait for the prompt.
126 Thus the last thing that a procedure does with the serial line
127 will be an expect_prompt(). Exception: eb_resume does not
128 wait for the prompt, because the terminal is being handed over
129 to the inferior. However, the next thing which happens after that
130 is a eb_wait which does wait for the prompt.
131 Note that this includes abnormal exit, e.g. error(). This is
132 necessary to prevent getting into states from which we can't
137 #if defined (LOG_FILE)
138 /* This is a convenient place to do this. The idea is to do it often
139 enough that we never lose much data if we terminate abnormally. */
145 /* Get a hex digit from the remote system & return its value.
146 If ignore_space is nonzero, ignore spaces (not newline, tab, etc). */
148 get_hex_digit (ignore_space
)
155 if (ch
>= '0' && ch
<= '9')
157 else if (ch
>= 'A' && ch
<= 'F')
158 return ch
- 'A' + 10;
159 else if (ch
>= 'a' && ch
<= 'f')
160 return ch
- 'a' + 10;
161 else if (ch
== ' ' && ignore_space
)
166 error ("Invalid hex digit from remote system.");
171 /* Get a byte from eb_desc and put it in *BYT. Accept any number
179 val
= get_hex_digit (1) << 4;
180 val
|= get_hex_digit (0);
184 /* Get N 32-bit words from remote, each preceded by a space,
185 and put them in registers starting at REGNO. */
187 get_hex_regs (n
, regno
)
194 for (i
= 0; i
< n
; i
++)
199 for (j
= 0; j
< 8; j
++)
200 val
= (val
<< 4) + get_hex_digit (j
== 0);
201 supply_register (regno
++, (char *) &val
);
205 /* Called when SIGALRM signal sent due to alarm() timeout. */
209 #define volatile /**/
211 volatile int n_alarms
;
218 printf ("eb_timer called\n");
224 /* malloc'd name of the program on the remote system. */
225 static char *prog_name
= NULL
;
227 /* Nonzero if we have loaded the file ("yc") and not yet issued a "gi"
228 command. "gi" is supposed to happen exactly once for each "yc". */
229 static int need_gi
= 0;
231 /* Number of SIGTRAPs we need to simulate. That is, the next
232 NEED_ARTIFICIAL_TRAP calls to eb_wait should just return
233 SIGTRAP without actually waiting for anything. */
235 static int need_artificial_trap
= 0;
237 /* This is called not only when we first attach, but also when the
238 user types "run" after having attached. */
240 eb_create_inferior (execfile
, args
, env
)
248 error ("Can't pass arguments to remote EBMON process");
250 if (execfile
== 0 || exec_bfd
== 0)
251 error ("No exec file specified");
253 entry_pt
= (int) bfd_get_start_address (exec_bfd
);
256 /* OK, now read in the file. Y=read, C=COFF, D=no symbols
257 0=start address, %s=filename. */
259 fprintf (eb_stream
, "YC D,0:%s", prog_name
);
262 fprintf(eb_stream
, " %s", args
);
264 fprintf (eb_stream
, "\n");
272 /* The "process" (board) is already stopped awaiting our commands, and
273 the program is already downloaded. We just set its PC and go. */
275 clear_proceed_status ();
277 /* Tell wait_for_inferior that we've started a new process. */
278 init_wait_for_inferior ();
280 /* Set up the "saved terminal modes" of the inferior
281 based on what modes we are starting it with. */
282 target_terminal_init ();
284 /* Install inferior's terminal modes. */
285 target_terminal_inferior ();
287 /* insert_step_breakpoint (); FIXME, do we need this? */
288 proceed ((CORE_ADDR
)entry_pt
, TARGET_SIGNAL_DEFAULT
, 0); /* Let 'er rip... */
291 /* Translate baud rates from integers to damn B_codes. Unix should
292 have outgrown this crap years ago, but even POSIX wouldn't buck it. */
301 struct {int rate
, damn_b
;} baudtab
[] = {
326 for (i
= 0; baudtab
[i
].rate
!= -1; i
++)
327 if (rate
== baudtab
[i
].rate
) return baudtab
[i
].damn_b
;
328 return B38400
; /* Random */
332 /* Open a connection to a remote debugger.
333 NAME is the filename used for communication, then a space,
334 then the name of the program as we should name it to EBMON. */
336 static int baudrate
= 9600;
337 static char *dev_name
;
339 eb_open (name
, from_tty
)
347 target_preopen (from_tty
);
349 /* Find the first whitespace character, it separates dev_name from
355 *p
!= '\0' && !isspace (*p
); p
++)
360 Please include the name of the device for the serial port,\n\
361 the baud rate, and the name of the program to run on the remote system.");
362 dev_name
= alloca (p
- name
+ 1);
363 strncpy (dev_name
, name
, p
- name
);
364 dev_name
[p
- name
] = '\0';
366 /* Skip over the whitespace after dev_name */
367 for (; isspace (*p
); p
++)
370 if (1 != sscanf (p
, "%d ", &baudrate
))
373 /* Skip the number and then the spaces */
374 for (; isdigit (*p
); p
++)
376 for (; isspace (*p
); p
++)
379 if (prog_name
!= NULL
)
381 prog_name
= savestring (p
, strlen (p
));
385 eb_desc
= open (dev_name
, O_RDWR
);
387 perror_with_name (dev_name
);
388 ioctl (eb_desc
, TIOCGETP
, &sg
);
390 sg
.c_cc
[VMIN
] = 0; /* read with timeout. */
391 sg
.c_cc
[VTIME
] = timeout
* 10;
392 sg
.c_lflag
&= ~(ICANON
| ECHO
);
393 sg
.c_cflag
= (sg
.c_cflag
& ~CBAUD
) | damn_b (baudrate
);
395 sg
.sg_ispeed
= damn_b (baudrate
);
396 sg
.sg_ospeed
= damn_b (baudrate
);
397 sg
.sg_flags
|= RAW
| ANYP
;
398 sg
.sg_flags
&= ~ECHO
;
401 ioctl (eb_desc
, TIOCSETP
, &sg
);
402 eb_stream
= fdopen (eb_desc
, "r+");
404 push_target (&eb_ops
);
406 printf ("Remote %s debugging %s using %s\n", target_shortname
,
407 prog_name
, dev_name
);
410 #ifndef NO_SIGINTERRUPT
411 /* Cause SIGALRM's to make reads fail with EINTR instead of resuming
413 if (siginterrupt (SIGALRM
, 1) != 0)
414 perror ("eb_open: error in siginterrupt");
417 /* Set up read timeout timer. */
418 if ((void (*)) signal (SIGALRM
, eb_timer
) == (void (*)) -1)
419 perror ("eb_open: error in signal");
422 #if defined (LOG_FILE)
423 log_file
= fopen (LOG_FILE
, "w");
424 if (log_file
== NULL
)
425 perror_with_name (LOG_FILE
);
428 /* Hello? Are you there? */
429 write (eb_desc
, "\n", 1);
434 /* Close out all files and local state before this target loses control. */
441 /* Due to a bug in Unix, fclose closes not only the stdio stream,
442 but also the file descriptor. So we don't actually close
445 fclose (eb_stream
); /* This also closes eb_desc */
447 /* close (eb_desc); */
449 /* Do not try to close eb_desc again, later in the program. */
453 #if defined (LOG_FILE)
455 if (ferror (log_file
))
456 printf ("Error writing log file.\n");
457 if (fclose (log_file
) != 0)
458 printf ("Error closing log file.\n");
463 /* Terminate the open connection to the remote debugger.
464 Use this when you want to detach and do something else
470 pop_target(); /* calls eb_close to do the real work */
472 printf ("Ending remote %s debugging\n", target_shortname
);
475 /* Tell the remote machine to resume. */
478 eb_resume (pid
, step
, sig
)
480 enum target_signal sig
;
484 write (eb_desc
, "t 1,s\n", 6);
485 /* Wait for the echo. */
487 /* Then comes a line containing the instruction we stepped to. */
489 /* Then we get the prompt. */
492 /* Force the next eb_wait to return a trap. Not doing anything
493 about I/O from the target means that the user has to type
494 "continue" to see any. This should be fixed. */
495 need_artificial_trap
= 1;
502 write (eb_desc
, "gi\n", 3);
504 /* Swallow the echo of "gi". */
509 write (eb_desc
, "GR\n", 3);
510 /* Swallow the echo. */
516 /* Wait until the remote machine stops, then return,
517 storing status in STATUS just as `wait' would. */
521 struct target_waitstatus
*status
;
523 /* Strings to look for. '?' means match any single character.
524 Note that with the algorithm we use, the initial character
525 of the string cannot recur in the string, or we will not
526 find some cases of the string in the input. */
528 static char bpt
[] = "Invalid interrupt taken - #0x50 - ";
529 /* It would be tempting to look for "\n[__exit + 0x8]\n"
530 but that requires loading symbols with "yc i" and even if
531 we did do that we don't know that the file has symbols. */
532 static char exitmsg
[] = "\n@????????I JMPTI GR121,LR0";
536 /* Large enough for either sizeof (bpt) or sizeof (exitmsg) chars. */
538 /* Current position in swallowed. */
539 char *swallowed_p
= swallowed
;
544 int old_timeout
= timeout
;
546 status
->kind
= TARGET_WAITKIND_EXITED
;
547 status
->value
.integer
= 0;
549 if (need_artificial_trap
!= 0)
551 status
->kind
= TARGET_WAITKIND_STOPPED
;
552 status
->value
.sig
= TARGET_SIGNAL_TRAP
;
553 need_artificial_trap
--;
557 timeout
= 0; /* Don't time out -- user program is running. */
574 if (ch
== *ep
|| *ep
== '?')
591 /* Print out any characters which have been swallowed. */
592 for (p
= swallowed
; p
< swallowed_p
; ++p
)
594 swallowed_p
= swallowed
;
602 status
->kind
= TARGET_WAITKIND_STOPPED
;
603 status
->value
.sig
= TARGET_SIGNAL_TRAP
;
607 status
->kind
= TARGET_WAITKIND_EXITED
;
608 status
->value
.integer
= 0;
610 timeout
= old_timeout
;
615 /* Return the name of register number REGNO
616 in the form input and output by EBMON.
618 Returns a pointer to a static buffer containing the answer. */
624 if (regno
>= GR96_REGNUM
&& regno
< GR96_REGNUM
+ 32)
625 sprintf (buf
, "GR%03d", regno
- GR96_REGNUM
+ 96);
626 else if (regno
>= LR0_REGNUM
&& regno
< LR0_REGNUM
+ 128)
627 sprintf (buf
, "LR%03d", regno
- LR0_REGNUM
);
628 else if (regno
== Q_REGNUM
)
629 strcpy (buf
, "SR131");
630 else if (regno
>= BP_REGNUM
&& regno
<= CR_REGNUM
)
631 sprintf (buf
, "SR%03d", regno
- BP_REGNUM
+ 133);
632 else if (regno
== ALU_REGNUM
)
633 strcpy (buf
, "SR132");
634 else if (regno
>= IPC_REGNUM
&& regno
<= IPB_REGNUM
)
635 sprintf (buf
, "SR%03d", regno
- IPC_REGNUM
+ 128);
636 else if (regno
>= VAB_REGNUM
&& regno
<= LRU_REGNUM
)
637 sprintf (buf
, "SR%03d", regno
- VAB_REGNUM
);
638 else if (regno
== GR1_REGNUM
)
639 strcpy (buf
, "GR001");
643 /* Read the remote registers into the block REGS. */
646 eb_fetch_registers ()
654 /* This should not be necessary, because one is supposed to read the
655 registers only when the inferior is stopped (at least with
656 ptrace() and why not make it the same for remote?). */
657 /* ^A is the "normal character" used to make sure we are talking to EBMON
658 and not to the program being debugged. */
659 write (eb_desc
, "\001\n");
663 write (eb_desc
, "dw gr96,gr127\n", 14);
664 for (reg_index
= 96, regnum_index
= GR96_REGNUM
;
666 reg_index
+= 4, regnum_index
+= 4)
668 sprintf (tempbuf
, "GR%03d ", reg_index
);
670 get_hex_regs (4, regnum_index
);
674 for (i
= 0; i
< 128; i
+= 32)
676 /* The PC has a tendency to hang if we get these
677 all in one fell swoop ("dw lr0,lr127"). */
678 sprintf (tempbuf
, "dw lr%d\n", i
);
679 write (eb_desc
, tempbuf
, strlen (tempbuf
));
680 for (reg_index
= i
, regnum_index
= LR0_REGNUM
+ i
;
682 reg_index
+= 4, regnum_index
+= 4)
684 sprintf (tempbuf
, "LR%03d ", reg_index
);
686 get_hex_regs (4, regnum_index
);
691 write (eb_desc
, "dw sr133,sr133\n", 15);
693 get_hex_regs (1, BP_REGNUM
);
696 write (eb_desc
, "dw sr134,sr134\n", 15);
698 get_hex_regs (1, FC_REGNUM
);
701 write (eb_desc
, "dw sr135,sr135\n", 15);
703 get_hex_regs (1, CR_REGNUM
);
706 write (eb_desc
, "dw sr131,sr131\n", 15);
708 get_hex_regs (1, Q_REGNUM
);
711 write (eb_desc
, "dw sr0,sr14\n", 12);
712 for (reg_index
= 0, regnum_index
= VAB_REGNUM
;
713 regnum_index
<= LRU_REGNUM
;
714 regnum_index
+= 4, reg_index
+= 4)
716 sprintf (tempbuf
, "SR%03d ", reg_index
);
718 get_hex_regs (reg_index
== 12 ? 3 : 4, regnum_index
);
722 /* There doesn't seem to be any way to get these. */
725 supply_register (FPE_REGNUM
, (char *) &val
);
726 supply_register (INTE_REGNUM
, (char *) &val
);
727 supply_register (FPS_REGNUM
, (char *) &val
);
728 supply_register (EXO_REGNUM
, (char *) &val
);
731 write (eb_desc
, "dw gr1,gr1\n", 11);
733 get_hex_regs (1, GR1_REGNUM
);
737 /* Fetch register REGNO, or all registers if REGNO is -1.
738 Returns errno value. */
740 eb_fetch_register (regno
)
744 eb_fetch_registers ();
747 char *name
= get_reg_name (regno
);
748 fprintf (eb_stream
, "dw %s,%s\n", name
, name
);
751 get_hex_regs (1, regno
);
757 /* Store the remote registers from the contents of the block REGS. */
760 eb_store_registers ()
763 fprintf (eb_stream
, "s gr1,%x\n", read_register (GR1_REGNUM
));
766 for (j
= 0; j
< 32; j
+= 16)
768 fprintf (eb_stream
, "s gr%d,", j
+ 96);
769 for (i
= 0; i
< 15; ++i
)
770 fprintf (eb_stream
, "%x,", read_register (GR96_REGNUM
+ j
+ i
));
771 fprintf (eb_stream
, "%x\n", read_register (GR96_REGNUM
+ j
+ 15));
775 for (j
= 0; j
< 128; j
+= 16)
777 fprintf (eb_stream
, "s lr%d,", j
);
778 for (i
= 0; i
< 15; ++i
)
779 fprintf (eb_stream
, "%x,", read_register (LR0_REGNUM
+ j
+ i
));
780 fprintf (eb_stream
, "%x\n", read_register (LR0_REGNUM
+ j
+ 15));
784 fprintf (eb_stream
, "s sr133,%x,%x,%x\n", read_register (BP_REGNUM
),
785 read_register (FC_REGNUM
), read_register (CR_REGNUM
));
787 fprintf (eb_stream
, "s sr131,%x\n", read_register (Q_REGNUM
));
789 fprintf (eb_stream
, "s sr0,");
790 for (i
= 0; i
< 11; ++i
)
791 fprintf (eb_stream
, "%x,", read_register (VAB_REGNUM
+ i
));
792 fprintf (eb_stream
, "%x\n", read_register (VAB_REGNUM
+ 11));
796 /* Store register REGNO, or all if REGNO == 0.
797 Return errno value. */
799 eb_store_register (regno
)
803 eb_store_registers ();
806 char *name
= get_reg_name (regno
);
807 fprintf (eb_stream
, "s %s,%x\n", name
, read_register (regno
));
808 /* Setting GR1 changes the numbers of all the locals, so
809 invalidate the register cache. Do this *after* calling
810 read_register, because we want read_register to return the
811 value that write_register has just stuffed into the registers
812 array, not the value of the register fetched from the
814 if (regno
== GR1_REGNUM
)
815 registers_changed ();
820 /* Get ready to modify the registers array. On machines which store
821 individual registers, this doesn't need to do anything. On machines
822 which store all the registers in one fell swoop, this makes sure
823 that registers contains all the registers from the program being
827 eb_prepare_to_store ()
829 /* Do nothing, since we can store individual regs */
833 /* FIXME-someday! Merge these two. */
835 eb_xfer_inferior_memory (memaddr
, myaddr
, len
, write
, target
)
840 struct target_ops
*target
; /* ignored */
843 return eb_write_inferior_memory (memaddr
, myaddr
, len
);
845 return eb_read_inferior_memory (memaddr
, myaddr
, len
);
851 printf ("\tAttached to %s at %d baud and running program %s.\n",
852 dev_name
, baudrate
, prog_name
);
855 /* Copy LEN bytes of data from debugger memory at MYADDR
856 to inferior's memory at MEMADDR. Returns length moved. */
858 eb_write_inferior_memory (memaddr
, myaddr
, len
)
865 for (i
= 0; i
< len
; i
++)
868 fprintf (eb_stream
, "sb %x,", memaddr
+ i
);
869 if ((i
% 16) == 15 || i
== len
- 1)
871 fprintf (eb_stream
, "%x\n", ((unsigned char *)myaddr
)[i
]);
875 fprintf (eb_stream
, "%x,", ((unsigned char *)myaddr
)[i
]);
880 /* Read LEN bytes from inferior memory at MEMADDR. Put the result
881 at debugger address MYADDR. Returns length moved. */
883 eb_read_inferior_memory(memaddr
, myaddr
, len
)
890 /* Number of bytes read so far. */
893 /* Starting address of this pass. */
894 unsigned long startaddr
;
896 /* Number of bytes to read in this pass. */
899 /* Note that this code works correctly if startaddr is just less
900 than UINT_MAX (well, really CORE_ADDR_MAX if there was such a
901 thing). That is, something like
902 eb_read_bytes (CORE_ADDR_MAX - 4, foo, 4)
903 works--it never adds len to memaddr and gets 0. */
904 /* However, something like
905 eb_read_bytes (CORE_ADDR_MAX - 3, foo, 4)
906 doesn't need to work. Detect it and give up if there's an attempt
908 if (((memaddr
- 1) + len
) < memaddr
) {
918 if ((startaddr
% 16) != 0)
919 len_this_pass
-= startaddr
% 16;
920 if (len_this_pass
> (len
- count
))
921 len_this_pass
= (len
- count
);
923 fprintf (eb_stream
, "db %x,%x\n", startaddr
,
924 (startaddr
- 1) + len_this_pass
);
927 /* Look for 8 hex digits. */
931 if (isxdigit (readchar ()))
936 error ("Hex digit expected from remote system.");
944 for (i
= 0; i
< len_this_pass
; i
++)
945 get_hex_byte (&myaddr
[count
++]);
949 startaddr
+= len_this_pass
;
955 eb_kill (args
, from_tty
)
959 return; /* Ignore attempts to kill target system */
962 /* Clean up when a program exits.
964 The program actually lives on in the remote processor's RAM, and may be
965 run again without a download. Don't leave it full of breakpoint
971 remove_breakpoints ();
972 unpush_target (&eb_ops
);
973 generic_mourn_inferior (); /* Do all the proper things now */
975 /* Define the target subroutine names */
977 struct target_ops eb_ops
= {
978 "amd-eb", "Remote serial AMD EBMON target",
979 "Use a remote computer running EBMON connected by a serial line.\n\
980 Arguments are the name of the device for the serial line,\n\
981 the speed to connect at in bits per second, and the filename of the\n\
982 executable as it exists on the remote computer. For example,\n\
983 target amd-eb /dev/ttya 9600 demo",
985 0, eb_detach
, eb_resume
, eb_wait
,
986 eb_fetch_register
, eb_store_register
,
988 eb_xfer_inferior_memory
, eb_files_info
,
989 0, 0, /* Breakpoints */
990 0, 0, 0, 0, 0, /* Terminal handling */
992 generic_load
, /* load */
993 0, /* lookup_symbol */
997 0, /* notice_signals */
999 process_stratum
, 0, /* next */
1000 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */
1001 0, 0, /* Section pointers */
1002 OPS_MAGIC
, /* Always the last thing */
1006 _initialize_remote_eb ()
1008 add_target (&eb_ops
);
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