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04497f0b NW |
1 | /*- |
2 | * This code is derived from software copyrighted by the Free Software | |
3 | * Foundation. | |
4 | * | |
5 | * Modified 1991 by Donn Seeley at UUNET Technologies, Inc. | |
6 | */ | |
7 | ||
8 | #ifndef lint | |
9 | static char sccsid[] = "@(#)default-dep.c 6.3 (Berkeley) 5/8/91"; | |
10 | #endif /* not lint */ | |
11 | ||
12 | /* Low level interface to ptrace, for GDB when running under Unix. | |
13 | Copyright (C) 1988, 1989 Free Software Foundation, Inc. | |
14 | ||
15 | This file is part of GDB. | |
16 | ||
17 | GDB is free software; you can redistribute it and/or modify | |
18 | it under the terms of the GNU General Public License as published by | |
19 | the Free Software Foundation; either version 1, or (at your option) | |
20 | any later version. | |
21 | ||
22 | GDB is distributed in the hope that it will be useful, | |
23 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | GNU General Public License for more details. | |
26 | ||
27 | You should have received a copy of the GNU General Public License | |
28 | along with GDB; see the file COPYING. If not, write to | |
29 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
30 | ||
31 | #include <stdio.h> | |
32 | #include "defs.h" | |
33 | #include "param.h" | |
34 | #include "frame.h" | |
35 | #include "inferior.h" | |
36 | ||
37 | #ifdef USG | |
38 | #include <sys/types.h> | |
39 | #endif | |
40 | ||
41 | #include <sys/param.h> | |
42 | #include <sys/dir.h> | |
43 | #include <signal.h> | |
44 | #include <sys/ioctl.h> | |
45 | /* #include <fcntl.h> Can we live without this? */ | |
46 | ||
47 | #ifdef COFF_ENCAPSULATE | |
48 | #include "a.out.encap.h" | |
49 | #else | |
50 | #include <a.out.h> | |
51 | #endif | |
52 | #ifndef N_SET_MAGIC | |
53 | #define N_SET_MAGIC(exec, val) ((exec).a_magic = (val)) | |
54 | #endif | |
55 | ||
56 | #include <sys/user.h> /* After a.out.h */ | |
57 | #include <sys/file.h> | |
58 | #include <sys/stat.h> | |
59 | ||
60 | extern int errno; | |
61 | \f | |
62 | /* This function simply calls ptrace with the given arguments. | |
63 | It exists so that all calls to ptrace are isolated in this | |
64 | machine-dependent file. */ | |
65 | int | |
66 | call_ptrace (request, pid, arg3, arg4) | |
67 | int request, pid, arg3, arg4; | |
68 | { | |
69 | return ptrace (request, pid, arg3, arg4); | |
70 | } | |
71 | ||
72 | kill_inferior () | |
73 | { | |
74 | if (remote_debugging) | |
75 | return; | |
76 | if (inferior_pid == 0) | |
77 | return; | |
78 | ptrace (8, inferior_pid, 0, 0); | |
79 | wait (0); | |
80 | inferior_died (); | |
81 | } | |
82 | ||
83 | /* This is used when GDB is exiting. It gives less chance of error.*/ | |
84 | ||
85 | kill_inferior_fast () | |
86 | { | |
87 | if (remote_debugging) | |
88 | return; | |
89 | if (inferior_pid == 0) | |
90 | return; | |
91 | ptrace (8, inferior_pid, 0, 0); | |
92 | wait (0); | |
93 | } | |
94 | ||
95 | /* Resume execution of the inferior process. | |
96 | If STEP is nonzero, single-step it. | |
97 | If SIGNAL is nonzero, give it that signal. */ | |
98 | ||
99 | void | |
100 | resume (step, signal) | |
101 | int step; | |
102 | int signal; | |
103 | { | |
104 | errno = 0; | |
105 | if (remote_debugging) | |
106 | remote_resume (step, signal); | |
107 | else | |
108 | { | |
109 | ptrace (step ? 9 : 7, inferior_pid, 1, signal); | |
110 | if (errno) | |
111 | perror_with_name ("ptrace"); | |
112 | } | |
113 | } | |
114 | \f | |
115 | void | |
116 | fetch_inferior_registers () | |
117 | { | |
118 | register int regno; | |
119 | register unsigned int regaddr; | |
120 | char buf[MAX_REGISTER_RAW_SIZE]; | |
121 | register int i; | |
122 | ||
123 | struct user u; | |
124 | unsigned int offset = (char *) &u.u_ar0 - (char *) &u; | |
125 | offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR; | |
126 | ||
127 | for (regno = 0; regno < NUM_REGS; regno++) | |
128 | { | |
129 | regaddr = register_addr (regno, offset); | |
130 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) | |
131 | { | |
132 | *(int *) &buf[i] = ptrace (3, inferior_pid, regaddr, 0); | |
133 | regaddr += sizeof (int); | |
134 | } | |
135 | supply_register (regno, buf); | |
136 | } | |
137 | } | |
138 | ||
139 | /* Store our register values back into the inferior. | |
140 | If REGNO is -1, do this for all registers. | |
141 | Otherwise, REGNO specifies which register (so we can save time). */ | |
142 | ||
143 | store_inferior_registers (regno) | |
144 | int regno; | |
145 | { | |
146 | register unsigned int regaddr; | |
147 | char buf[80]; | |
148 | ||
149 | struct user u; | |
150 | unsigned int offset = (char *) &u.u_ar0 - (char *) &u; | |
151 | offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR; | |
152 | ||
153 | if (regno >= 0) | |
154 | { | |
155 | regaddr = register_addr (regno, offset); | |
156 | errno = 0; | |
157 | ptrace (6, inferior_pid, regaddr, read_register (regno)); | |
158 | if (errno != 0) | |
159 | { | |
160 | sprintf (buf, "writing register number %d", regno); | |
161 | perror_with_name (buf); | |
162 | } | |
163 | } | |
164 | else for (regno = 0; regno < NUM_REGS; regno++) | |
165 | { | |
166 | regaddr = register_addr (regno, offset); | |
167 | errno = 0; | |
168 | ptrace (6, inferior_pid, regaddr, read_register (regno)); | |
169 | if (errno != 0) | |
170 | { | |
171 | sprintf (buf, "writing all regs, number %d", regno); | |
172 | perror_with_name (buf); | |
173 | } | |
174 | } | |
175 | } | |
176 | \f | |
177 | /* Copy LEN bytes from inferior's memory starting at MEMADDR | |
178 | to debugger memory starting at MYADDR. | |
179 | On failure (cannot read from inferior, usually because address is out | |
180 | of bounds) returns the value of errno. */ | |
181 | ||
182 | int | |
183 | read_inferior_memory (memaddr, myaddr, len) | |
184 | CORE_ADDR memaddr; | |
185 | char *myaddr; | |
186 | int len; | |
187 | { | |
188 | register int i; | |
189 | /* Round starting address down to longword boundary. */ | |
190 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
191 | /* Round ending address up; get number of longwords that makes. */ | |
192 | register int count | |
193 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
194 | /* Allocate buffer of that many longwords. */ | |
195 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
196 | extern int errno; | |
197 | ||
198 | /* Read all the longwords */ | |
199 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
200 | { | |
201 | errno = 0; | |
202 | #if 0 | |
203 | /* This is now done by read_memory, because when this function did it, | |
204 | reading a byte or short int hardware port read whole longs, causing | |
205 | serious side effects | |
206 | such as bus errors and unexpected hardware operation. This would | |
207 | also be a problem with ptrace if the inferior process could read | |
208 | or write hardware registers, but that's not usually the case. */ | |
209 | if (remote_debugging) | |
210 | buffer[i] = remote_fetch_word (addr); | |
211 | else | |
212 | #endif | |
213 | buffer[i] = ptrace (1, inferior_pid, addr, 0); | |
214 | if (errno) | |
215 | return errno; | |
216 | } | |
217 | ||
218 | /* Copy appropriate bytes out of the buffer. */ | |
219 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | /* Copy LEN bytes of data from debugger memory at MYADDR | |
224 | to inferior's memory at MEMADDR. | |
225 | On failure (cannot write the inferior) | |
226 | returns the value of errno. */ | |
227 | ||
228 | int | |
229 | write_inferior_memory (memaddr, myaddr, len) | |
230 | CORE_ADDR memaddr; | |
231 | char *myaddr; | |
232 | int len; | |
233 | { | |
234 | register int i; | |
235 | /* Round starting address down to longword boundary. */ | |
236 | register CORE_ADDR addr = memaddr & - sizeof (int); | |
237 | /* Round ending address up; get number of longwords that makes. */ | |
238 | register int count | |
239 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); | |
240 | /* Allocate buffer of that many longwords. */ | |
241 | register int *buffer = (int *) alloca (count * sizeof (int)); | |
242 | extern int errno; | |
243 | ||
244 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
245 | ||
246 | if (remote_debugging) | |
247 | return (remote_write_inferior_memory(memaddr, myaddr, len)); | |
248 | ||
249 | buffer[0] = ptrace (1, inferior_pid, addr, 0); | |
250 | ||
251 | if (count > 1) | |
252 | buffer[count - 1] = ptrace (1, inferior_pid, | |
253 | addr + (count - 1) * sizeof (int), 0); | |
254 | ||
255 | /* Copy data to be written over corresponding part of buffer */ | |
256 | ||
257 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
258 | ||
259 | /* Write the entire buffer. */ | |
260 | ||
261 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
262 | { | |
263 | errno = 0; | |
264 | ptrace (4, inferior_pid, addr, buffer[i]); | |
265 | if (errno) | |
266 | return errno; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | \f | |
272 | /* Work with core dump and executable files, for GDB. | |
273 | This code would be in core.c if it weren't machine-dependent. */ | |
274 | ||
275 | #ifndef N_TXTADDR | |
276 | #define N_TXTADDR(hdr) 0 | |
277 | #endif /* no N_TXTADDR */ | |
278 | ||
279 | #ifndef N_DATADDR | |
280 | #define N_DATADDR(hdr) hdr.a_text | |
281 | #endif /* no N_DATADDR */ | |
282 | ||
283 | /* Make COFF and non-COFF names for things a little more compatible | |
284 | to reduce conditionals later. */ | |
285 | ||
286 | #ifdef COFF_FORMAT | |
287 | #define a_magic magic | |
288 | #endif | |
289 | ||
290 | #ifndef COFF_FORMAT | |
291 | #ifndef AOUTHDR | |
292 | #define AOUTHDR struct exec | |
293 | #endif | |
294 | #endif | |
295 | ||
296 | extern char *sys_siglist[]; | |
297 | ||
298 | ||
299 | /* Hook for `exec_file_command' command to call. */ | |
300 | ||
301 | extern void (*exec_file_display_hook) (); | |
302 | ||
303 | /* File names of core file and executable file. */ | |
304 | ||
305 | extern char *corefile; | |
306 | extern char *execfile; | |
307 | ||
308 | /* Descriptors on which core file and executable file are open. | |
309 | Note that the execchan is closed when an inferior is created | |
310 | and reopened if the inferior dies or is killed. */ | |
311 | ||
312 | extern int corechan; | |
313 | extern int execchan; | |
314 | ||
315 | /* Last modification time of executable file. | |
316 | Also used in source.c to compare against mtime of a source file. */ | |
317 | ||
318 | extern int exec_mtime; | |
319 | ||
320 | /* Virtual addresses of bounds of the two areas of memory in the core file. */ | |
321 | ||
322 | extern CORE_ADDR data_start; | |
323 | extern CORE_ADDR data_end; | |
324 | extern CORE_ADDR stack_start; | |
325 | extern CORE_ADDR stack_end; | |
326 | ||
327 | /* Virtual addresses of bounds of two areas of memory in the exec file. | |
328 | Note that the data area in the exec file is used only when there is no core file. */ | |
329 | ||
330 | extern CORE_ADDR text_start; | |
331 | extern CORE_ADDR text_end; | |
332 | ||
333 | extern CORE_ADDR exec_data_start; | |
334 | extern CORE_ADDR exec_data_end; | |
335 | ||
336 | /* Address in executable file of start of text area data. */ | |
337 | ||
338 | extern int text_offset; | |
339 | ||
340 | /* Address in executable file of start of data area data. */ | |
341 | ||
342 | extern int exec_data_offset; | |
343 | ||
344 | /* Address in core file of start of data area data. */ | |
345 | ||
346 | extern int data_offset; | |
347 | ||
348 | /* Address in core file of start of stack area data. */ | |
349 | ||
350 | extern int stack_offset; | |
351 | ||
352 | #ifdef COFF_FORMAT | |
353 | /* various coff data structures */ | |
354 | ||
355 | extern FILHDR file_hdr; | |
356 | extern SCNHDR text_hdr; | |
357 | extern SCNHDR data_hdr; | |
358 | ||
359 | #endif /* not COFF_FORMAT */ | |
360 | ||
361 | /* a.out header saved in core file. */ | |
362 | ||
363 | extern AOUTHDR core_aouthdr; | |
364 | ||
365 | /* a.out header of exec file. */ | |
366 | ||
367 | extern AOUTHDR exec_aouthdr; | |
368 | ||
369 | extern void validate_files (); | |
370 | \f | |
371 | core_file_command (filename, from_tty) | |
372 | char *filename; | |
373 | int from_tty; | |
374 | { | |
375 | int val; | |
376 | extern char registers[]; | |
377 | ||
378 | /* Discard all vestiges of any previous core file | |
379 | and mark data and stack spaces as empty. */ | |
380 | ||
381 | if (corefile) | |
382 | free (corefile); | |
383 | corefile = 0; | |
384 | ||
385 | if (corechan >= 0) | |
386 | close (corechan); | |
387 | corechan = -1; | |
388 | ||
389 | data_start = 0; | |
390 | data_end = 0; | |
391 | stack_start = STACK_END_ADDR; | |
392 | stack_end = STACK_END_ADDR; | |
393 | ||
394 | /* Now, if a new core file was specified, open it and digest it. */ | |
395 | ||
396 | if (filename) | |
397 | { | |
398 | filename = tilde_expand (filename); | |
399 | make_cleanup (free, filename); | |
400 | ||
401 | if (have_inferior_p ()) | |
402 | error ("To look at a core file, you must kill the inferior with \"kill\"."); | |
403 | corechan = open (filename, O_RDONLY, 0); | |
404 | if (corechan < 0) | |
405 | perror_with_name (filename); | |
406 | /* 4.2-style (and perhaps also sysV-style) core dump file. */ | |
407 | { | |
408 | struct user u; | |
409 | ||
410 | unsigned int reg_offset; | |
411 | ||
412 | val = myread (corechan, &u, sizeof u); | |
413 | if (val < 0) | |
414 | perror_with_name ("Not a core file: reading upage"); | |
415 | if (val != sizeof u) | |
416 | error ("Not a core file: could only read %d bytes", val); | |
417 | ||
418 | /* We are depending on exec_file_command having been called | |
419 | previously to set exec_data_start. Since the executable | |
420 | and the core file share the same text segment, the address | |
421 | of the data segment will be the same in both. */ | |
422 | data_start = exec_data_start; | |
423 | ||
424 | data_end = data_start + NBPG * u.u_dsize; | |
425 | stack_start = stack_end - NBPG * u.u_ssize; | |
426 | data_offset = NBPG * UPAGES; | |
427 | stack_offset = NBPG * (UPAGES + u.u_dsize); | |
428 | ||
429 | /* Some machines put an absolute address in here and some put | |
430 | the offset in the upage of the regs. */ | |
431 | reg_offset = (int) u.u_ar0; | |
432 | if (reg_offset > NBPG * UPAGES) | |
433 | reg_offset -= KERNEL_U_ADDR; | |
434 | ||
435 | /* I don't know where to find this info. | |
436 | So, for now, mark it as not available. */ | |
437 | N_SET_MAGIC (core_aouthdr, 0); | |
438 | ||
439 | /* Read the register values out of the core file and store | |
440 | them where `read_register' will find them. */ | |
441 | ||
442 | { | |
443 | register int regno; | |
444 | ||
445 | for (regno = 0; regno < NUM_REGS; regno++) | |
446 | { | |
447 | char buf[MAX_REGISTER_RAW_SIZE]; | |
448 | ||
449 | val = lseek (corechan, register_addr (regno, reg_offset), 0); | |
450 | if (val < 0 | |
451 | || (val = myread (corechan, buf, sizeof buf)) < 0) | |
452 | { | |
453 | char * buffer = (char *) alloca (strlen (reg_names[regno]) | |
454 | + 30); | |
455 | strcpy (buffer, "Reading register "); | |
456 | strcat (buffer, reg_names[regno]); | |
457 | ||
458 | perror_with_name (buffer); | |
459 | } | |
460 | ||
461 | supply_register (regno, buf); | |
462 | } | |
463 | } | |
464 | } | |
465 | if (filename[0] == '/') | |
466 | corefile = savestring (filename, strlen (filename)); | |
467 | else | |
468 | { | |
469 | corefile = concat (current_directory, "/", filename); | |
470 | } | |
471 | ||
472 | set_current_frame ( create_new_frame (read_register (FP_REGNUM), | |
473 | read_pc ())); | |
474 | select_frame (get_current_frame (), 0); | |
475 | validate_files (); | |
476 | } | |
477 | else if (from_tty) | |
478 | printf ("No core file now.\n"); | |
479 | } | |
480 | \f | |
481 | exec_file_command (filename, from_tty) | |
482 | char *filename; | |
483 | int from_tty; | |
484 | { | |
485 | int val; | |
486 | ||
487 | /* Eliminate all traces of old exec file. | |
488 | Mark text segment as empty. */ | |
489 | ||
490 | if (execfile) | |
491 | free (execfile); | |
492 | execfile = 0; | |
493 | data_start = 0; | |
494 | data_end -= exec_data_start; | |
495 | text_start = 0; | |
496 | text_end = 0; | |
497 | exec_data_start = 0; | |
498 | exec_data_end = 0; | |
499 | if (execchan >= 0) | |
500 | close (execchan); | |
501 | execchan = -1; | |
502 | ||
503 | /* Now open and digest the file the user requested, if any. */ | |
504 | ||
505 | if (filename) | |
506 | { | |
507 | filename = tilde_expand (filename); | |
508 | make_cleanup (free, filename); | |
509 | ||
510 | execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, | |
511 | &execfile); | |
512 | if (execchan < 0) | |
513 | perror_with_name (filename); | |
514 | ||
515 | #ifdef COFF_FORMAT | |
516 | { | |
517 | int aout_hdrsize; | |
518 | int num_sections; | |
519 | ||
520 | if (read_file_hdr (execchan, &file_hdr) < 0) | |
521 | error ("\"%s\": not in executable format.", execfile); | |
522 | ||
523 | aout_hdrsize = file_hdr.f_opthdr; | |
524 | num_sections = file_hdr.f_nscns; | |
525 | ||
526 | if (read_aout_hdr (execchan, &exec_aouthdr, aout_hdrsize) < 0) | |
527 | error ("\"%s\": can't read optional aouthdr", execfile); | |
528 | ||
529 | if (read_section_hdr (execchan, _TEXT, &text_hdr, num_sections, | |
530 | aout_hdrsize) < 0) | |
531 | error ("\"%s\": can't read text section header", execfile); | |
532 | ||
533 | if (read_section_hdr (execchan, _DATA, &data_hdr, num_sections, | |
534 | aout_hdrsize) < 0) | |
535 | error ("\"%s\": can't read data section header", execfile); | |
536 | ||
537 | text_start = exec_aouthdr.text_start; | |
538 | text_end = text_start + exec_aouthdr.tsize; | |
539 | text_offset = text_hdr.s_scnptr; | |
540 | exec_data_start = exec_aouthdr.data_start; | |
541 | exec_data_end = exec_data_start + exec_aouthdr.dsize; | |
542 | exec_data_offset = data_hdr.s_scnptr; | |
543 | data_start = exec_data_start; | |
544 | data_end += exec_data_start; | |
545 | exec_mtime = file_hdr.f_timdat; | |
546 | } | |
547 | #else /* not COFF_FORMAT */ | |
548 | { | |
549 | struct stat st_exec; | |
550 | ||
551 | #ifdef HEADER_SEEK_FD | |
552 | HEADER_SEEK_FD (execchan); | |
553 | #endif | |
554 | ||
555 | val = myread (execchan, &exec_aouthdr, sizeof (AOUTHDR)); | |
556 | ||
557 | if (val < 0) | |
558 | perror_with_name (filename); | |
559 | ||
560 | text_start = N_TXTADDR (exec_aouthdr); | |
561 | exec_data_start = N_DATADDR (exec_aouthdr); | |
562 | ||
563 | text_offset = N_TXTOFF (exec_aouthdr); | |
564 | exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text; | |
565 | ||
566 | text_end = text_start + exec_aouthdr.a_text; | |
567 | exec_data_end = exec_data_start + exec_aouthdr.a_data; | |
568 | data_start = exec_data_start; | |
569 | data_end += exec_data_start; | |
570 | ||
571 | if (fstat (execchan, &st_exec) < 0) | |
572 | perror_with_name (filename); | |
573 | exec_mtime = st_exec.st_mtime; | |
574 | } | |
575 | #endif /* not COFF_FORMAT */ | |
576 | ||
577 | validate_files (); | |
578 | } | |
579 | else if (from_tty) | |
580 | printf ("No exec file now.\n"); | |
581 | ||
582 | /* Tell display code (if any) about the changed file name. */ | |
583 | if (exec_file_display_hook) | |
584 | (*exec_file_display_hook) (filename); | |
585 | } |