4187119d |
1 | /* Low level interface to ptrace, for GDB when running under m68k SVR2 Unix |
2 | on Altos 3068. Report bugs to Jyrki Kuoppala <jkp@cs.hut.fi> |
3 | Copyright (C) 1989 Free Software Foundation, Inc. |
4 | |
5 | This file is part of GDB. |
6 | |
7 | GDB 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 1, or (at your option) |
10 | any later version. |
11 | |
12 | GDB 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. |
16 | |
17 | You should have received a copy of the GNU General Public License |
18 | along with GDB; see the file COPYING. If not, write to |
19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
e91b87a3 |
20 | |
7a67dd45 |
21 | #include <stdio.h> |
e91b87a3 |
22 | #include "defs.h" |
23 | #include "param.h" |
24 | #include "frame.h" |
25 | #include "inferior.h" |
26 | |
27 | #ifdef USG |
28 | #include <sys/types.h> |
29 | #endif |
30 | |
e91b87a3 |
31 | #include <sys/param.h> |
32 | #include <sys/dir.h> |
33 | #include <signal.h> |
34 | #include <sys/ioctl.h> |
35 | #include <fcntl.h> |
4187119d |
36 | #ifdef USG |
37 | #include <sys/page.h> |
38 | #ifdef ALTOS |
39 | #include <sys/net.h> |
40 | #include <errno.h> |
41 | #endif |
42 | #endif |
e91b87a3 |
43 | |
44 | #ifdef COFF_ENCAPSULATE |
45 | #include "a.out.encap.h" |
46 | #else |
47 | #include <a.out.h> |
48 | #endif |
49 | #ifndef N_SET_MAGIC |
50 | #define N_SET_MAGIC(exec, val) ((exec).a_magic = (val)) |
51 | #endif |
52 | |
4187119d |
53 | #include <sys/user.h> /* After a.out.h */ |
e91b87a3 |
54 | #include <sys/file.h> |
55 | #include <sys/stat.h> |
56 | |
57 | extern int errno; |
58 | \f |
59 | /* This function simply calls ptrace with the given arguments. |
60 | It exists so that all calls to ptrace are isolated in this |
4187119d |
61 | machine-dependent file. */ |
e91b87a3 |
62 | int |
63 | call_ptrace (request, pid, arg3, arg4) |
64 | int request, pid, arg3, arg4; |
65 | { |
e91b87a3 |
66 | return ptrace (request, pid, arg3, arg4); |
e91b87a3 |
67 | } |
68 | |
69 | kill_inferior () |
70 | { |
71 | if (remote_debugging) |
72 | return; |
73 | if (inferior_pid == 0) |
74 | return; |
75 | ptrace (8, inferior_pid, 0, 0); |
76 | wait (0); |
77 | inferior_died (); |
78 | } |
79 | |
80 | /* This is used when GDB is exiting. It gives less chance of error.*/ |
81 | |
82 | kill_inferior_fast () |
83 | { |
84 | if (remote_debugging) |
85 | return; |
86 | if (inferior_pid == 0) |
87 | return; |
88 | ptrace (8, inferior_pid, 0, 0); |
89 | wait (0); |
90 | } |
91 | |
92 | /* Resume execution of the inferior process. |
93 | If STEP is nonzero, single-step it. |
94 | If SIGNAL is nonzero, give it that signal. */ |
95 | |
96 | void |
97 | resume (step, signal) |
98 | int step; |
99 | int signal; |
100 | { |
101 | errno = 0; |
102 | if (remote_debugging) |
103 | remote_resume (step, signal); |
104 | else |
105 | { |
106 | ptrace (step ? 9 : 7, inferior_pid, 1, signal); |
107 | if (errno) |
108 | perror_with_name ("ptrace"); |
109 | } |
110 | } |
111 | \f |
112 | void |
113 | fetch_inferior_registers () |
114 | { |
115 | register int regno; |
116 | register unsigned int regaddr; |
117 | char buf[MAX_REGISTER_RAW_SIZE]; |
118 | register int i; |
119 | |
120 | struct user u; |
4187119d |
121 | unsigned int offset = (char *) &u.u_state - (char *) &u; |
e91b87a3 |
122 | offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR; |
123 | |
124 | for (regno = 0; regno < NUM_REGS; regno++) |
125 | { |
126 | regaddr = register_addr (regno, offset); |
127 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
128 | { |
129 | *(int *) &buf[i] = ptrace (3, inferior_pid, regaddr, 0); |
130 | regaddr += sizeof (int); |
131 | } |
132 | supply_register (regno, buf); |
133 | } |
134 | } |
135 | |
136 | /* Store our register values back into the inferior. |
137 | If REGNO is -1, do this for all registers. |
138 | Otherwise, REGNO specifies which register (so we can save time). */ |
139 | |
140 | store_inferior_registers (regno) |
141 | int regno; |
142 | { |
143 | register unsigned int regaddr; |
144 | char buf[80]; |
145 | |
146 | struct user u; |
4187119d |
147 | unsigned int offset = (char *) &u.u_state - (char *) &u; |
e91b87a3 |
148 | offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR; |
149 | |
150 | if (regno >= 0) |
151 | { |
152 | regaddr = register_addr (regno, offset); |
153 | errno = 0; |
4187119d |
154 | ptrace (6, inferior_pid, regaddr, read_register (regno)); |
e91b87a3 |
155 | if (errno != 0) |
156 | { |
157 | sprintf (buf, "writing register number %d", regno); |
158 | perror_with_name (buf); |
159 | } |
160 | } |
161 | else for (regno = 0; regno < NUM_REGS; regno++) |
162 | { |
163 | regaddr = register_addr (regno, offset); |
164 | errno = 0; |
4187119d |
165 | ptrace (6, inferior_pid, regaddr, read_register (regno)); |
e91b87a3 |
166 | if (errno != 0) |
167 | { |
168 | sprintf (buf, "writing all regs, number %d", regno); |
169 | perror_with_name (buf); |
170 | } |
171 | } |
172 | } |
173 | \f |
174 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
175 | to debugger memory starting at MYADDR. |
176 | On failure (cannot read from inferior, usually because address is out |
177 | of bounds) returns the value of errno. */ |
178 | |
179 | int |
180 | read_inferior_memory (memaddr, myaddr, len) |
181 | CORE_ADDR memaddr; |
182 | char *myaddr; |
183 | int len; |
184 | { |
185 | register int i; |
186 | /* Round starting address down to longword boundary. */ |
187 | register CORE_ADDR addr = memaddr & - sizeof (int); |
188 | /* Round ending address up; get number of longwords that makes. */ |
189 | register int count |
190 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
191 | /* Allocate buffer of that many longwords. */ |
192 | register int *buffer = (int *) alloca (count * sizeof (int)); |
193 | extern int errno; |
194 | |
195 | /* Read all the longwords */ |
196 | for (i = 0; i < count; i++, addr += sizeof (int)) |
197 | { |
198 | errno = 0; |
199 | if (remote_debugging) |
200 | buffer[i] = remote_fetch_word (addr); |
201 | else |
202 | buffer[i] = ptrace (1, inferior_pid, addr, 0); |
203 | if (errno) |
204 | return errno; |
205 | } |
206 | |
207 | /* Copy appropriate bytes out of the buffer. */ |
208 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
209 | return 0; |
210 | } |
211 | |
212 | /* Copy LEN bytes of data from debugger memory at MYADDR |
213 | to inferior's memory at MEMADDR. |
214 | On failure (cannot write the inferior) |
215 | returns the value of errno. */ |
216 | |
217 | int |
218 | write_inferior_memory (memaddr, myaddr, len) |
219 | CORE_ADDR memaddr; |
220 | char *myaddr; |
221 | int len; |
222 | { |
223 | register int i; |
224 | /* Round starting address down to longword boundary. */ |
225 | register CORE_ADDR addr = memaddr & - sizeof (int); |
226 | /* Round ending address up; get number of longwords that makes. */ |
227 | register int count |
228 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
229 | /* Allocate buffer of that many longwords. */ |
230 | register int *buffer = (int *) alloca (count * sizeof (int)); |
231 | extern int errno; |
232 | |
233 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
234 | |
235 | if (remote_debugging) |
236 | buffer[0] = remote_fetch_word (addr); |
237 | else |
238 | buffer[0] = ptrace (1, inferior_pid, addr, 0); |
239 | |
240 | if (count > 1) |
241 | { |
242 | if (remote_debugging) |
243 | buffer[count - 1] |
244 | = remote_fetch_word (addr + (count - 1) * sizeof (int)); |
245 | else |
246 | buffer[count - 1] |
247 | = ptrace (1, inferior_pid, |
248 | addr + (count - 1) * sizeof (int), 0); |
249 | } |
250 | |
251 | /* Copy data to be written over corresponding part of buffer */ |
252 | |
253 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
254 | |
255 | /* Write the entire buffer. */ |
256 | |
257 | for (i = 0; i < count; i++, addr += sizeof (int)) |
258 | { |
259 | errno = 0; |
260 | if (remote_debugging) |
261 | remote_store_word (addr, buffer[i]); |
262 | else |
263 | ptrace (4, inferior_pid, addr, buffer[i]); |
264 | if (errno) |
265 | return errno; |
266 | } |
267 | |
268 | return 0; |
269 | } |
270 | \f |
271 | /* Work with core dump and executable files, for GDB. |
272 | This code would be in core.c if it weren't machine-dependent. */ |
273 | |
e91b87a3 |
274 | #ifndef N_TXTADDR |
275 | #define N_TXTADDR(hdr) 0 |
276 | #endif /* no N_TXTADDR */ |
277 | |
278 | #ifndef N_DATADDR |
279 | #define N_DATADDR(hdr) hdr.a_text |
280 | #endif /* no N_DATADDR */ |
281 | |
282 | /* Make COFF and non-COFF names for things a little more compatible |
283 | to reduce conditionals later. */ |
284 | |
285 | #ifdef COFF_FORMAT |
286 | #define a_magic magic |
287 | #endif |
288 | |
289 | #ifndef COFF_FORMAT |
4187119d |
290 | #ifndef AOUTHDR |
e91b87a3 |
291 | #define AOUTHDR struct exec |
292 | #endif |
4187119d |
293 | #endif |
e91b87a3 |
294 | |
295 | extern char *sys_siglist[]; |
296 | |
297 | |
298 | /* Hook for `exec_file_command' command to call. */ |
299 | |
300 | extern void (*exec_file_display_hook) (); |
301 | |
302 | /* File names of core file and executable file. */ |
303 | |
304 | extern char *corefile; |
305 | extern char *execfile; |
306 | |
307 | /* Descriptors on which core file and executable file are open. |
308 | Note that the execchan is closed when an inferior is created |
309 | and reopened if the inferior dies or is killed. */ |
310 | |
311 | extern int corechan; |
312 | extern int execchan; |
313 | |
314 | /* Last modification time of executable file. |
315 | Also used in source.c to compare against mtime of a source file. */ |
316 | |
317 | extern int exec_mtime; |
318 | |
319 | /* Virtual addresses of bounds of the two areas of memory in the core file. */ |
320 | |
321 | extern CORE_ADDR data_start; |
322 | extern CORE_ADDR data_end; |
323 | extern CORE_ADDR stack_start; |
324 | extern CORE_ADDR stack_end; |
325 | |
326 | /* Virtual addresses of bounds of two areas of memory in the exec file. |
327 | Note that the data area in the exec file is used only when there is no core file. */ |
328 | |
329 | extern CORE_ADDR text_start; |
330 | extern CORE_ADDR text_end; |
331 | |
332 | extern CORE_ADDR exec_data_start; |
333 | extern CORE_ADDR exec_data_end; |
334 | |
335 | /* Address in executable file of start of text area data. */ |
336 | |
337 | extern int text_offset; |
338 | |
339 | /* Address in executable file of start of data area data. */ |
340 | |
341 | extern int exec_data_offset; |
342 | |
343 | /* Address in core file of start of data area data. */ |
344 | |
345 | extern int data_offset; |
346 | |
347 | /* Address in core file of start of stack area data. */ |
348 | |
349 | extern int stack_offset; |
350 | |
351 | #ifdef COFF_FORMAT |
352 | /* various coff data structures */ |
353 | |
354 | extern FILHDR file_hdr; |
355 | extern SCNHDR text_hdr; |
356 | extern SCNHDR data_hdr; |
357 | |
358 | #endif /* not COFF_FORMAT */ |
359 | |
360 | /* a.out header saved in core file. */ |
361 | |
362 | extern AOUTHDR core_aouthdr; |
363 | |
364 | /* a.out header of exec file. */ |
365 | |
366 | extern AOUTHDR exec_aouthdr; |
367 | |
368 | extern void validate_files (); |
369 | \f |
370 | core_file_command (filename, from_tty) |
371 | char *filename; |
372 | int from_tty; |
373 | { |
374 | int val; |
375 | extern char registers[]; |
376 | |
377 | /* Discard all vestiges of any previous core file |
378 | and mark data and stack spaces as empty. */ |
379 | |
380 | if (corefile) |
381 | free (corefile); |
382 | corefile = 0; |
383 | |
384 | if (corechan >= 0) |
385 | close (corechan); |
386 | corechan = -1; |
387 | |
388 | data_start = 0; |
389 | data_end = 0; |
390 | stack_start = STACK_END_ADDR; |
391 | stack_end = STACK_END_ADDR; |
392 | |
393 | /* Now, if a new core file was specified, open it and digest it. */ |
394 | |
395 | if (filename) |
396 | { |
4187119d |
397 | filename = tilde_expand (filename); |
398 | make_cleanup (free, filename); |
399 | |
e91b87a3 |
400 | if (have_inferior_p ()) |
401 | error ("To look at a core file, you must kill the inferior with \"kill\"."); |
402 | corechan = open (filename, O_RDONLY, 0); |
403 | if (corechan < 0) |
404 | perror_with_name (filename); |
405 | /* 4.2-style (and perhaps also sysV-style) core dump file. */ |
406 | { |
407 | struct user u; |
408 | |
4187119d |
409 | unsigned int reg_offset; |
e91b87a3 |
410 | |
411 | val = myread (corechan, &u, sizeof u); |
412 | if (val < 0) |
413 | perror_with_name ("Not a core file: reading upage"); |
4187119d |
414 | if (val != sizeof u) |
e91b87a3 |
415 | error ("Not a core file: could only read %d bytes", val); |
416 | data_start = exec_data_start; |
417 | |
4187119d |
418 | #define NBPG NBPP |
419 | #define UPAGES USIZE |
420 | |
e91b87a3 |
421 | data_end = data_start + NBPG * u.u_dsize; |
422 | stack_start = stack_end - NBPG * u.u_ssize; |
4187119d |
423 | data_offset = NBPG * UPAGES + exec_data_start % NBPG /* Not sure about this //jkp */; |
e91b87a3 |
424 | stack_offset = NBPG * (UPAGES + u.u_dsize); |
425 | |
4187119d |
426 | /* Some machines put an absolute address in here and some put |
427 | the offset in the upage of the regs. */ |
428 | reg_offset = (int) u.u_state; |
e91b87a3 |
429 | if (reg_offset > NBPG * UPAGES) |
430 | reg_offset -= KERNEL_U_ADDR; |
431 | |
4187119d |
432 | bcopy (&u.u_exdata, &core_aouthdr, sizeof (AOUTHDR)); |
433 | printf ("Core file is from \"%s\".\n", u.u_comm); |
434 | |
e91b87a3 |
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); |
4187119d |
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 | } |
e91b87a3 |
460 | |
e91b87a3 |
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 | { |
4187119d |
507 | filename = tilde_expand (filename); |
508 | make_cleanup (free, filename); |
509 | |
e91b87a3 |
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 | |
7a67dd45 |
529 | if (read_section_hdr (execchan, _TEXT, &text_hdr, num_sections, |
530 | aout_hdrsize) < 0) |
e91b87a3 |
531 | error ("\"%s\": can't read text section header", execfile); |
532 | |
7a67dd45 |
533 | if (read_section_hdr (execchan, _DATA, &data_hdr, num_sections, |
534 | aout_hdrsize) < 0) |
e91b87a3 |
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 | fstat (execchan, &st_exec); |
572 | exec_mtime = st_exec.st_mtime; |
573 | } |
574 | #endif /* not COFF_FORMAT */ |
575 | |
576 | validate_files (); |
577 | } |
578 | else if (from_tty) |
579 | printf ("No exec file now.\n"); |
580 | |
581 | /* Tell display code (if any) about the changed file name. */ |
582 | if (exec_file_display_hook) |
583 | (*exec_file_display_hook) (filename); |
584 | } |
e91b87a3 |
585 | |