1 /* Interface to bare machine for GDB running as kernel debugger.
2 Copyright (C) 1986, 1989, 1991 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 #include <sys/ioctl.h>
23 #include <sys/types.h>
26 #if defined (SIGTSTP) && defined (SIGIO)
28 #include <sys/resource.h>
29 #endif /* SIGTSTP and SIGIO defined (must be 4.2) */
39 /* Random system calls, mostly no-ops to prevent link problems */
41 ioctl (desc
, code
, arg
)
71 /* Used to check for existence of .gdbinit. Say no. */
80 error ("Fatal error; restarting.");
83 /* Reading "files". The contents of some files are written into kdb's
84 data area before it is run. These files are used to contain the
85 symbol table for kdb to load, and the source files (in case the
86 kdb user wants to print them). The symbols are stored in a file
87 named "kdb-symbols" in a.out format (except that all the text and
88 data have been stripped to save room).
90 The files are stored in the following format:
91 int number of bytes of data for this file, including these four.
92 char[] name of the file, ending with a null.
93 padding to multiple of 4 boundary.
94 char[] file contents. The length can be deduced from what was
95 specified before. There is no terminating null here.
97 If the int at the front is zero, it means there are no more files.
99 Opening a file in kdb returns a nonzero value to indicate success,
100 but the value does not matter. Only one file can be open, and only
101 for reading. All the primitives for input from the file know
102 which file is open and ignore what is specified for the descriptor
103 or for the stdio stream.
105 Input with fgetc can be done either on the file that is open
106 or on stdin (which reads from the terminal through tty_input () */
108 /* Address of data for the files stored in format described above. */
111 /* The file stream currently open: */
113 char *sourcebeg
; /* beginning of contents */
114 int sourcesize
; /* size of contents */
115 char *sourceptr
; /* current read pointer */
116 int sourceleft
; /* number of bytes to eof */
118 /* "descriptor" for the file now open.
119 Incremented at each close.
120 If specified descriptor does not match this,
121 it means the program is trying to use a closed descriptor.
122 We report an error for that. */
126 open (filename
, modes
)
144 for (next
= files_start
; * (int *) next
; next
+= * (int *) next
)
146 if (!STRCMP (next
+ 4, filename
))
148 sourcebeg
= next
+ 4 + strlen (next
+ 4) + 1;
149 sourcebeg
= (char *) (((int) sourcebeg
+ 3) & (-4));
150 sourceptr
= sourcebeg
;
151 sourcesize
= next
+ * (int *) next
- sourceptr
;
152 sourceleft
= sourcesize
;
164 /* Don't let sourcedesc get big enough to be confused with stdin. */
165 if (sourcedesc
== 100)
170 fopen (filename
, modes
)
174 return (FILE *) open (filename
, *modes
== 'w');
181 return (FILE *) desc
;
190 fstat (desc
, statbuf
)
191 struct stat
*statbuf
;
193 if (desc
!= sourcedesc
)
198 statbuf
->st_size
= sourcesize
;
201 myread (desc
, destptr
, size
, filename
)
207 int len
= min (sourceleft
, size
);
209 if (desc
!= sourcedesc
)
215 memcpy (destptr
, sourceptr
, len
);
221 fread (bufp
, numelts
, eltsize
, stream
)
223 register int elts
= min (numelts
, sourceleft
/ eltsize
);
224 register int len
= elts
* eltsize
;
226 if (stream
!= sourcedesc
)
232 memcpy (bufp
, sourceptr
, len
);
242 if (desc
== (int) stdin
)
245 if (desc
!= sourcedesc
)
251 if (sourceleft
-- <= 0)
261 if (desc
!= sourcedesc
)
267 if (pos
< 0 || pos
> sourcesize
)
273 sourceptr
= sourcebeg
+ pos
;
274 sourceleft
= sourcesize
- pos
;
277 /* Output in kdb can go only to the terminal, so the stream
278 specified may be ignored. */
280 printf (a1
, a2
, a3
, a4
, a5
, a6
, a7
, a8
, a9
)
283 sprintf (buffer
, a1
, a2
, a3
, a4
, a5
, a6
, a7
, a8
, a9
);
284 display_string (buffer
);
287 fprintf (ign
, a1
, a2
, a3
, a4
, a5
, a6
, a7
, a8
, a9
)
290 sprintf (buffer
, a1
, a2
, a3
, a4
, a5
, a6
, a7
, a8
, a9
);
291 display_string (buffer
);
294 fwrite (buf
, numelts
, size
, stream
)
298 register int i
= numelts
* size
;
300 fputc (*buf
++, stream
);
308 display_string (buf
);
311 /* sprintf refers to this, but loading this from the
312 library would cause fflush to be loaded from it too.
313 In fact there should be no need to call this (I hope). */
317 error ("_flsbuf was actually called.");
324 /* Entries into core and inflow, needed only to make things link ok. */
336 /* Makes one printout look reasonable; value does not matter otherwise. */
340 /* Nonzero if there is a core file. */
358 terminal_init_inferior ()
361 write_inferior_register ()
364 read_inferior_register ()
367 read_memory (memaddr
, myaddr
, len
)
372 memcpy (myaddr
, memaddr
, len
);
375 /* Always return 0 indicating success. */
377 write_memory (memaddr
, myaddr
, len
)
382 memcpy (memaddr
, myaddr
, len
);
386 static REGISTER_TYPE saved_regs
[NUM_REGS
];
389 read_register (regno
)
392 if (regno
< 0 || regno
>= NUM_REGS
)
393 error ("Register number %d out of range.", regno
);
394 return saved_regs
[regno
];
398 write_register (regno
, value
)
402 if (regno
< 0 || regno
>= NUM_REGS
)
403 error ("Register number %d out of range.", regno
);
404 saved_regs
[regno
] = value
;
407 /* System calls needed in relation to running the "inferior". */
411 /* Just appear to "succeed". Say the inferior's pid is 1. */
415 /* These are called by code that normally runs in the inferior
416 that has just been forked. That code never runs, when standalone,
417 and these definitions are so it will link without errors. */
431 /* Malloc calls these. */
436 printf ("\n%s.\n\n", str
);
446 if (next_free
+ amount
> memory_limit
)
449 return next_free
- amount
;
452 /* Various ways malloc might ask where end of memory is. */
463 return memory_limit
- next_free
;
469 addr
->rlim_cur
= memory_limit
- next_free
;
472 /* Context switching to and from program being debugged. */
474 /* GDB calls here to run the user program.
475 The frame pointer for this function is saved in
476 gdb_stack by save_frame_pointer; then we restore
477 all of the user program's registers, including PC and PS. */
479 static int fault_code
;
480 static REGISTER_TYPE gdb_stack
;
484 REGISTER_TYPE restore
[NUM_REGS
];
487 save_frame_pointer ();
489 memcpy (restore
, saved_regs
, sizeof restore
);
491 /* Control does not drop through here! */
494 save_frame_pointer (val
)
500 /* Fault handlers call here, running in the user program stack.
501 They must first push a fault code,
502 old PC, old PS, and any other info about the fault.
503 The exact format is machine-dependent and is known only
504 in the definition of PUSH_REGISTERS. */
508 /* Transfer all registers and fault code to the stack
509 in canonical order: registers in order of GDB register number,
510 followed by fault code. */
513 /* Transfer them to saved_regs and fault_code. */
517 /* Control does not reach here */
522 CORE_ADDR new_fp
= gdb_stack
;
523 /* Switch to GDB's stack */
525 /* Return from the function `resume'. */
528 /* Assuming register contents and fault code have been pushed on the stack as
529 arguments to this function, copy them into the standard place
530 for the program's registers while GDB is running. */
532 save_registers (firstreg
)
535 memcpy (saved_regs
, &firstreg
, sizeof saved_regs
);
536 fault_code
= (&firstreg
)[NUM_REGS
];
539 /* Store into the structure such as `wait' would return
540 the information on why the program faulted,
541 converted into a machine-independent signal number. */
543 static int fault_table
[] = FAULT_TABLE
;
549 WSETSTOP (*w
, fault_table
[fault_code
/ FAULT_CODE_UNITS
]);
553 /* Allocate a big space in which files for kdb to read will be stored.
554 Whatever is left is where malloc can allocate storage.
556 Initialize it, so that there will be space in the executable file
557 for it. Then the files can be put into kdb by writing them into
558 kdb's executable file. */
560 /* The default size is as much space as we expect to be available
564 #define HEAP_SIZE 400000
567 char heap
[HEAP_SIZE
] = {0};
570 #define STACK_SIZE 100000
573 int kdb_stack_beg
[STACK_SIZE
/ sizeof (int)];
576 _initialize_standalone ()
580 /* Find start of data on files. */
584 /* Find the end of the data on files. */
586 for (next
= files_start
; * (int *) next
; next
+= * (int *) next
) {}
588 /* That is where free storage starts for sbrk to give out. */
591 memory_limit
= heap
+ sizeof heap
;
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