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dd3b648e RP |
1 | /* Interface to bare machine for GDB running as kernel debugger. |
2 | Copyright (C) 1986, 1989, 1991 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
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. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e RP |
19 | |
20 | #include <stdio.h> | |
21 | #include <sys/ioctl.h> | |
22 | #include <errno.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | ||
26 | #if defined (SIGTSTP) && defined (SIGIO) | |
27 | #include <sys/time.h> | |
28 | #include <sys/resource.h> | |
29 | #endif /* SIGTSTP and SIGIO defined (must be 4.2) */ | |
30 | ||
31 | #include "defs.h" | |
dd3b648e RP |
32 | #include "signals.h" |
33 | #include "symtab.h" | |
34 | #include "frame.h" | |
35 | #include "inferior.h" | |
36 | #include "wait.h" | |
37 | ||
38 | \f | |
39 | /* Random system calls, mostly no-ops to prevent link problems */ | |
40 | ||
41 | ioctl (desc, code, arg) | |
42 | {} | |
43 | ||
44 | int (* signal ()) () | |
45 | {} | |
46 | ||
47 | kill () | |
48 | {} | |
49 | ||
50 | getpid () | |
51 | { | |
52 | return 0; | |
53 | } | |
54 | ||
55 | sigsetmask () | |
56 | {} | |
57 | ||
58 | chdir () | |
59 | {} | |
60 | ||
61 | char * | |
62 | getwd (buf) | |
63 | char *buf; | |
64 | { | |
65 | buf[0] = '/'; | |
66 | buf[1] = 0; | |
67 | return buf; | |
68 | } | |
69 | ||
70 | /* Used to check for existence of .gdbinit. Say no. */ | |
71 | ||
72 | access () | |
73 | { | |
74 | return -1; | |
75 | } | |
76 | ||
77 | exit () | |
78 | { | |
79 | error ("Fatal error; restarting."); | |
80 | } | |
81 | \f | |
82 | /* Reading "files". The contents of some files are written into kdb's | |
83 | data area before it is run. These files are used to contain the | |
84 | symbol table for kdb to load, and the source files (in case the | |
85 | kdb user wants to print them). The symbols are stored in a file | |
86 | named "kdb-symbols" in a.out format (except that all the text and | |
87 | data have been stripped to save room). | |
88 | ||
89 | The files are stored in the following format: | |
90 | int number of bytes of data for this file, including these four. | |
91 | char[] name of the file, ending with a null. | |
92 | padding to multiple of 4 boundary. | |
93 | char[] file contents. The length can be deduced from what was | |
94 | specified before. There is no terminating null here. | |
95 | ||
96 | If the int at the front is zero, it means there are no more files. | |
97 | ||
98 | Opening a file in kdb returns a nonzero value to indicate success, | |
99 | but the value does not matter. Only one file can be open, and only | |
100 | for reading. All the primitives for input from the file know | |
101 | which file is open and ignore what is specified for the descriptor | |
102 | or for the stdio stream. | |
103 | ||
104 | Input with fgetc can be done either on the file that is open | |
105 | or on stdin (which reads from the terminal through tty_input () */ | |
106 | ||
107 | /* Address of data for the files stored in format described above. */ | |
108 | char *files_start; | |
109 | ||
110 | /* The file stream currently open: */ | |
111 | ||
112 | char *sourcebeg; /* beginning of contents */ | |
113 | int sourcesize; /* size of contents */ | |
114 | char *sourceptr; /* current read pointer */ | |
115 | int sourceleft; /* number of bytes to eof */ | |
116 | ||
117 | /* "descriptor" for the file now open. | |
118 | Incremented at each close. | |
119 | If specified descriptor does not match this, | |
120 | it means the program is trying to use a closed descriptor. | |
121 | We report an error for that. */ | |
122 | ||
123 | int sourcedesc; | |
124 | ||
125 | open (filename, modes) | |
126 | char *filename; | |
127 | int modes; | |
128 | { | |
129 | register char *next; | |
130 | ||
131 | if (modes) | |
132 | { | |
133 | errno = EROFS; | |
134 | return -1; | |
135 | } | |
136 | ||
137 | if (sourceptr) | |
138 | { | |
139 | errno = EMFILE; | |
140 | return -1; | |
141 | } | |
142 | ||
143 | for (next - files_start; * (int *) next; | |
144 | next += * (int *) next) | |
145 | { | |
146 | if (!strcmp (next + 4, filename)) | |
147 | { | |
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; | |
153 | return sourcedesc; | |
154 | } | |
155 | } | |
156 | return 0; | |
157 | } | |
158 | ||
159 | close (desc) | |
160 | int desc; | |
161 | { | |
162 | sourceptr = 0; | |
163 | sourcedesc++; | |
164 | /* Don't let sourcedesc get big enough to be confused with stdin. */ | |
165 | if (sourcedesc == 100) | |
166 | sourcedesc = 5; | |
167 | } | |
168 | ||
169 | FILE * | |
170 | fopen (filename, modes) | |
171 | char *filename; | |
172 | char *modes; | |
173 | { | |
174 | return (FILE *) open (filename, *modes == 'w'); | |
175 | } | |
176 | ||
177 | FILE * | |
178 | fdopen (desc) | |
179 | int desc; | |
180 | { | |
181 | return (FILE *) desc; | |
182 | } | |
183 | ||
184 | fclose (desc) | |
185 | int desc; | |
186 | { | |
187 | close (desc); | |
188 | } | |
189 | ||
190 | fstat (desc, statbuf) | |
191 | struct stat *statbuf; | |
192 | { | |
193 | if (desc != sourcedesc) | |
194 | { | |
195 | errno = EBADF; | |
196 | return -1; | |
197 | } | |
198 | statbuf->st_size = sourcesize; | |
199 | } | |
200 | ||
201 | myread (desc, destptr, size, filename) | |
202 | int desc; | |
203 | char *destptr; | |
204 | int size; | |
205 | char *filename; | |
206 | { | |
207 | int len = min (sourceleft, size); | |
208 | ||
209 | if (desc != sourcedesc) | |
210 | { | |
211 | errno = EBADF; | |
212 | return -1; | |
213 | } | |
214 | ||
215 | bcopy (sourceptr, destptr, len); | |
216 | sourceleft -= len; | |
217 | return len; | |
218 | } | |
219 | ||
220 | int | |
221 | fread (bufp, numelts, eltsize, stream) | |
222 | { | |
223 | register int elts = min (numelts, sourceleft / eltsize); | |
224 | register int len = elts * eltsize; | |
225 | ||
226 | if (stream != sourcedesc) | |
227 | { | |
228 | errno = EBADF; | |
229 | return -1; | |
230 | } | |
231 | ||
232 | bcopy (sourceptr, bufp, len); | |
233 | sourceleft -= len; | |
234 | return elts; | |
235 | } | |
236 | ||
237 | int | |
238 | fgetc (desc) | |
239 | int desc; | |
240 | { | |
241 | ||
242 | if (desc == (int) stdin) | |
243 | return tty_input (); | |
244 | ||
245 | if (desc != sourcedesc) | |
246 | { | |
247 | errno = EBADF; | |
248 | return -1; | |
249 | } | |
250 | ||
251 | if (sourceleft-- <= 0) | |
252 | return EOF; | |
253 | return *sourceptr++; | |
254 | } | |
255 | ||
256 | lseek (desc, pos) | |
257 | int desc; | |
258 | int pos; | |
259 | { | |
260 | ||
261 | if (desc != sourcedesc) | |
262 | { | |
263 | errno = EBADF; | |
264 | return -1; | |
265 | } | |
266 | ||
267 | if (pos < 0 || pos > sourcesize) | |
268 | { | |
269 | errno = EINVAL; | |
270 | return -1; | |
271 | } | |
272 | ||
273 | sourceptr = sourcebeg + pos; | |
274 | sourceleft = sourcesize - pos; | |
275 | } | |
276 | \f | |
277 | /* Output in kdb can go only to the terminal, so the stream | |
278 | specified may be ignored. */ | |
279 | ||
280 | printf (a1, a2, a3, a4, a5, a6, a7, a8, a9) | |
281 | { | |
282 | char buffer[1024]; | |
283 | sprintf (buffer, a1, a2, a3, a4, a5, a6, a7, a8, a9); | |
284 | display_string (buffer); | |
285 | } | |
286 | ||
287 | fprintf (ign, a1, a2, a3, a4, a5, a6, a7, a8, a9) | |
288 | { | |
289 | char buffer[1024]; | |
290 | sprintf (buffer, a1, a2, a3, a4, a5, a6, a7, a8, a9); | |
291 | display_string (buffer); | |
292 | } | |
293 | ||
294 | fwrite (buf, numelts, size, stream) | |
295 | register char *buf; | |
296 | int numelts, size; | |
297 | { | |
298 | register int i = numelts * size; | |
299 | while (i-- > 0) | |
300 | fputc (*buf++, stream); | |
301 | } | |
302 | ||
303 | fputc (c, ign) | |
304 | { | |
305 | char buf[2]; | |
306 | buf[0] = c; | |
307 | buf[1] = 0; | |
308 | display_string (buf); | |
309 | } | |
310 | ||
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). */ | |
314 | ||
315 | _flsbuf () | |
316 | { | |
317 | error ("_flsbuf was actually called."); | |
318 | } | |
319 | ||
320 | fflush (ign) | |
321 | { | |
322 | } | |
323 | \f | |
324 | /* Entries into core and inflow, needed only to make things link ok. */ | |
325 | ||
326 | exec_file_command () | |
327 | {} | |
328 | ||
329 | core_file_command () | |
330 | {} | |
331 | ||
332 | char * | |
333 | get_exec_file (err) | |
334 | int err; | |
335 | { | |
336 | /* Makes one printout look reasonable; value does not matter otherwise. */ | |
337 | return "run"; | |
338 | } | |
339 | ||
340 | have_core_file_p () | |
341 | { | |
342 | return 0; | |
343 | } | |
344 | ||
345 | kill_command () | |
346 | { | |
347 | inferior_pid = 0; | |
348 | } | |
349 | ||
350 | terminal_inferior () | |
351 | {} | |
352 | ||
353 | terminal_ours () | |
354 | {} | |
355 | ||
356 | terminal_init_inferior () | |
357 | {} | |
358 | ||
359 | write_inferior_register () | |
360 | {} | |
361 | ||
362 | read_inferior_register () | |
363 | {} | |
364 | ||
365 | read_memory (memaddr, myaddr, len) | |
366 | CORE_ADDR memaddr; | |
367 | char *myaddr; | |
368 | int len; | |
369 | { | |
370 | bcopy (memaddr, myaddr, len); | |
371 | } | |
372 | ||
373 | /* Always return 0 indicating success. */ | |
374 | ||
375 | write_memory (memaddr, myaddr, len) | |
376 | CORE_ADDR memaddr; | |
377 | char *myaddr; | |
378 | int len; | |
379 | { | |
380 | bcopy (myaddr, memaddr, len); | |
381 | return 0; | |
382 | } | |
383 | ||
384 | static REGISTER_TYPE saved_regs[NUM_REGS]; | |
385 | ||
386 | REGISTER_TYPE | |
387 | read_register (regno) | |
388 | int regno; | |
389 | { | |
390 | if (regno < 0 || regno >= NUM_REGS) | |
391 | error ("Register number %d out of range.", regno); | |
392 | return saved_regs[regno]; | |
393 | } | |
394 | ||
395 | void | |
396 | write_register (regno, value) | |
397 | int regno; | |
398 | REGISTER_TYPE value; | |
399 | { | |
400 | if (regno < 0 || regno >= NUM_REGS) | |
401 | error ("Register number %d out of range.", regno); | |
402 | saved_regs[regno] = value; | |
403 | } | |
404 | \f | |
405 | /* System calls needed in relation to running the "inferior". */ | |
406 | ||
407 | vfork () | |
408 | { | |
409 | /* Just appear to "succeed". Say the inferior's pid is 1. */ | |
410 | return 1; | |
411 | } | |
412 | ||
413 | /* These are called by code that normally runs in the inferior | |
414 | that has just been forked. That code never runs, when standalone, | |
415 | and these definitions are so it will link without errors. */ | |
416 | ||
417 | ptrace () | |
418 | {} | |
419 | ||
420 | setpgrp () | |
421 | {} | |
422 | ||
423 | execle () | |
424 | {} | |
425 | ||
426 | _exit () | |
427 | {} | |
428 | \f | |
429 | /* Malloc calls these. */ | |
430 | ||
431 | malloc_warning (str) | |
432 | char *str; | |
433 | { | |
434 | printf ("\n%s.\n\n", str); | |
435 | } | |
436 | ||
437 | char *next_free; | |
438 | char *memory_limit; | |
439 | ||
440 | char * | |
441 | sbrk (amount) | |
442 | int amount; | |
443 | { | |
444 | if (next_free + amount > memory_limit) | |
445 | return (char *) -1; | |
446 | next_free += amount; | |
447 | return next_free - amount; | |
448 | } | |
449 | ||
450 | /* Various ways malloc might ask where end of memory is. */ | |
451 | ||
452 | char * | |
453 | ulimit () | |
454 | { | |
455 | return memory_limit; | |
456 | } | |
457 | ||
458 | int | |
459 | vlimit () | |
460 | { | |
461 | return memory_limit - next_free; | |
462 | } | |
463 | ||
464 | getrlimit (addr) | |
465 | struct rlimit *addr; | |
466 | { | |
467 | addr->rlim_cur = memory_limit - next_free; | |
468 | } | |
469 | \f | |
470 | /* Context switching to and from program being debugged. */ | |
471 | ||
472 | /* GDB calls here to run the user program. | |
473 | The frame pointer for this function is saved in | |
474 | gdb_stack by save_frame_pointer; then we restore | |
475 | all of the user program's registers, including PC and PS. */ | |
476 | ||
477 | static int fault_code; | |
478 | static REGISTER_TYPE gdb_stack; | |
479 | ||
480 | resume () | |
481 | { | |
482 | REGISTER_TYPE restore[NUM_REGS]; | |
483 | ||
484 | PUSH_FRAME_PTR; | |
485 | save_frame_pointer (); | |
486 | ||
487 | bcopy (saved_regs, restore, sizeof restore); | |
488 | POP_REGISTERS; | |
489 | /* Control does not drop through here! */ | |
490 | } | |
491 | ||
492 | save_frame_pointer (val) | |
493 | CORE_ADDR val; | |
494 | { | |
495 | gdb_stack = val; | |
496 | } | |
497 | ||
498 | /* Fault handlers call here, running in the user program stack. | |
499 | They must first push a fault code, | |
500 | old PC, old PS, and any other info about the fault. | |
501 | The exact format is machine-dependent and is known only | |
502 | in the definition of PUSH_REGISTERS. */ | |
503 | ||
504 | fault () | |
505 | { | |
506 | /* Transfer all registers and fault code to the stack | |
507 | in canonical order: registers in order of GDB register number, | |
508 | followed by fault code. */ | |
509 | PUSH_REGISTERS; | |
510 | ||
511 | /* Transfer them to saved_regs and fault_code. */ | |
512 | save_registers (); | |
513 | ||
514 | restore_gdb (); | |
515 | /* Control does not reach here */ | |
516 | } | |
517 | ||
518 | restore_gdb () | |
519 | { | |
520 | CORE_ADDR new_fp = gdb_stack; | |
521 | /* Switch to GDB's stack */ | |
522 | POP_FRAME_PTR; | |
523 | /* Return from the function `resume'. */ | |
524 | } | |
525 | ||
526 | /* Assuming register contents and fault code have been pushed on the stack as | |
527 | arguments to this function, copy them into the standard place | |
528 | for the program's registers while GDB is running. */ | |
529 | ||
530 | save_registers (firstreg) | |
531 | int firstreg; | |
532 | { | |
533 | bcopy (&firstreg, saved_regs, sizeof saved_regs); | |
534 | fault_code = (&firstreg)[NUM_REGS]; | |
535 | } | |
536 | ||
537 | /* Store into the structure such as `wait' would return | |
538 | the information on why the program faulted, | |
539 | converted into a machine-independent signal number. */ | |
540 | ||
541 | static int fault_table[] = FAULT_TABLE; | |
542 | ||
543 | int | |
544 | wait (w) | |
545 | WAITTYPE *w; | |
546 | { | |
547 | WSETSTOP (*w, fault_table[fault_code / FAULT_CODE_UNITS]); | |
548 | return inferior_pid; | |
549 | } | |
550 | \f | |
551 | /* Allocate a big space in which files for kdb to read will be stored. | |
552 | Whatever is left is where malloc can allocate storage. | |
553 | ||
554 | Initialize it, so that there will be space in the executable file | |
555 | for it. Then the files can be put into kdb by writing them into | |
556 | kdb's executable file. */ | |
557 | ||
558 | /* The default size is as much space as we expect to be available | |
559 | for kdb to use! */ | |
560 | ||
561 | #ifndef HEAP_SIZE | |
562 | #define HEAP_SIZE 400000 | |
563 | #endif | |
564 | ||
565 | char heap[HEAP_SIZE] = {0}; | |
566 | ||
567 | #ifndef STACK_SIZE | |
568 | #define STACK_SIZE 100000 | |
569 | #endif | |
570 | ||
571 | int kdb_stack_beg[STACK_SIZE / sizeof (int)]; | |
572 | int kdb_stack_end; | |
573 | ||
574 | _initialize_standalone () | |
575 | { | |
576 | register char *next; | |
577 | ||
578 | /* Find start of data on files. */ | |
579 | ||
580 | files_start = heap; | |
581 | ||
582 | /* Find the end of the data on files. */ | |
583 | ||
584 | for (next - files_start; * (int *) next; | |
585 | next += * (int *) next) | |
586 | {} | |
587 | ||
588 | /* That is where free storage starts for sbrk to give out. */ | |
589 | next_free = next; | |
590 | ||
591 | memory_limit = heap + sizeof heap; | |
592 | } | |
593 |