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* config/m68k/nm-hp300bsd.h: Correctly identify 4.3BSD vs 4.4BSD.
[deliverable/binutils-gdb.git] / gdb / procfs.c
1 /* Machine independent support for SVR4 /proc (process file system) for GDB.
2 Copyright 1991, 1992 Free Software Foundation, Inc.
3 Written by Fred Fish at Cygnus Support.
4
5 This file is part of GDB.
6
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.
11
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.
16
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. */
20
21
22 /* N O T E S
23
24 For information on the details of using /proc consult section proc(4)
25 in the UNIX System V Release 4 System Administrator's Reference Manual.
26
27 The general register and floating point register sets are manipulated by
28 separate ioctl's. This file makes the assumption that if FP0_REGNUM is
29 defined, then support for the floating point register set is desired,
30 regardless of whether or not the actual target has floating point hardware.
31
32 */
33
34
35 #include "defs.h"
36
37 #include <time.h>
38 #include <sys/procfs.h>
39 #include <fcntl.h>
40 #include <errno.h>
41 #include <string.h>
42 #include <stropts.h>
43 #include <poll.h>
44
45 #include "inferior.h"
46 #include "target.h"
47 #include "command.h"
48 #include "gdbcore.h"
49
50 #define MAX_SYSCALLS 256 /* Maximum number of syscalls for table */
51
52 #ifndef PROC_NAME_FMT
53 #define PROC_NAME_FMT "/proc/%05d"
54 #endif
55
56 extern struct target_ops procfs_ops; /* Forward declaration */
57
58 #if 1 /* FIXME: Gross and ugly hack to resolve coredep.c global */
59 CORE_ADDR kernel_u_addr;
60 #endif
61
62 #ifdef BROKEN_SIGINFO_H /* Workaround broken SGS <sys/siginfo.h> */
63 #undef si_pid
64 #define si_pid _data._proc.pid
65 #undef si_uid
66 #define si_uid _data._proc._pdata._kill.uid
67 #endif /* BROKEN_SIGINFO_H */
68
69 /* All access to the inferior, either one started by gdb or one that has
70 been attached to, is controlled by an instance of a procinfo structure,
71 defined below. Since gdb currently only handles one inferior at a time,
72 the procinfo structure for the inferior is statically allocated and
73 only one exists at any given time. There is a separate procinfo
74 structure for use by the "info proc" command, so that we can print
75 useful information about any random process without interfering with
76 the inferior's procinfo information. */
77
78 struct procinfo {
79 struct procinfo *next;
80 int pid; /* Process ID of inferior */
81 int fd; /* File descriptor for /proc entry */
82 char *pathname; /* Pathname to /proc entry */
83 int had_event; /* poll/select says something happened */
84 int was_stopped; /* Nonzero if was stopped prior to attach */
85 int nopass_next_sigstop; /* Don't pass a sigstop on next resume */
86 prrun_t prrun; /* Control state when it is run */
87 prstatus_t prstatus; /* Current process status info */
88 gregset_t gregset; /* General register set */
89 fpregset_t fpregset; /* Floating point register set */
90 fltset_t fltset; /* Current traced hardware fault set */
91 sigset_t trace; /* Current traced signal set */
92 sysset_t exitset; /* Current traced system call exit set */
93 sysset_t entryset; /* Current traced system call entry set */
94 fltset_t saved_fltset; /* Saved traced hardware fault set */
95 sigset_t saved_trace; /* Saved traced signal set */
96 sigset_t saved_sighold; /* Saved held signal set */
97 sysset_t saved_exitset; /* Saved traced system call exit set */
98 sysset_t saved_entryset; /* Saved traced system call entry set */
99 };
100
101 /* List of inferior process information */
102 static struct procinfo *procinfo_list = NULL;
103
104 static struct pollfd *poll_list; /* pollfds used for waiting on /proc */
105
106 static int num_poll_list = 0; /* Number of entries in poll_list */
107
108 static int last_resume_pid = -1; /* Last pid used with procfs_resume */
109
110 /* Much of the information used in the /proc interface, particularly for
111 printing status information, is kept as tables of structures of the
112 following form. These tables can be used to map numeric values to
113 their symbolic names and to a string that describes their specific use. */
114
115 struct trans {
116 int value; /* The numeric value */
117 char *name; /* The equivalent symbolic value */
118 char *desc; /* Short description of value */
119 };
120
121 /* Translate bits in the pr_flags member of the prstatus structure, into the
122 names and desc information. */
123
124 static struct trans pr_flag_table[] =
125 {
126 #if defined (PR_STOPPED)
127 PR_STOPPED, "PR_STOPPED", "Process is stopped",
128 #endif
129 #if defined (PR_ISTOP)
130 PR_ISTOP, "PR_ISTOP", "Stopped on an event of interest",
131 #endif
132 #if defined (PR_DSTOP)
133 PR_DSTOP, "PR_DSTOP", "A stop directive is in effect",
134 #endif
135 #if defined (PR_ASLEEP)
136 PR_ASLEEP, "PR_ASLEEP", "Sleeping in an interruptible system call",
137 #endif
138 #if defined (PR_FORK)
139 PR_FORK, "PR_FORK", "Inherit-on-fork is in effect",
140 #endif
141 #if defined (PR_RLC)
142 PR_RLC, "PR_RLC", "Run-on-last-close is in effect",
143 #endif
144 #if defined (PR_PTRACE)
145 PR_PTRACE, "PR_PTRACE", "Process is being controlled by ptrace",
146 #endif
147 #if defined (PR_PCINVAL)
148 PR_PCINVAL, "PR_PCINVAL", "PC refers to an invalid virtual address",
149 #endif
150 #if defined (PR_ISSYS)
151 PR_ISSYS, "PR_ISSYS", "Is a system process",
152 #endif
153 #if defined (PR_STEP)
154 PR_STEP, "PR_STEP", "Process has single step pending",
155 #endif
156 #if defined (PR_KLC)
157 PR_KLC, "PR_KLC", "Kill-on-last-close is in effect",
158 #endif
159 #if defined (PR_ASYNC)
160 PR_ASYNC, "PR_ASYNC", "Asynchronous stop is in effect",
161 #endif
162 #if defined (PR_PCOMPAT)
163 PR_PCOMPAT, "PR_PCOMPAT", "Ptrace compatibility mode in effect",
164 #endif
165 0, NULL, NULL
166 };
167
168 /* Translate values in the pr_why field of the prstatus struct. */
169
170 static struct trans pr_why_table[] =
171 {
172 #if defined (PR_REQUESTED)
173 PR_REQUESTED, "PR_REQUESTED", "Directed to stop via PIOCSTOP/PIOCWSTOP",
174 #endif
175 #if defined (PR_SIGNALLED)
176 PR_SIGNALLED, "PR_SIGNALLED", "Receipt of a traced signal",
177 #endif
178 #if defined (PR_FAULTED)
179 PR_FAULTED, "PR_FAULTED", "Incurred a traced hardware fault",
180 #endif
181 #if defined (PR_SYSENTRY)
182 PR_SYSENTRY, "PR_SYSENTRY", "Entry to a traced system call",
183 #endif
184 #if defined (PR_SYSEXIT)
185 PR_SYSEXIT, "PR_SYSEXIT", "Exit from a traced system call",
186 #endif
187 #if defined (PR_JOBCONTROL)
188 PR_JOBCONTROL, "PR_JOBCONTROL", "Default job control stop signal action",
189 #endif
190 #if defined (PR_SUSPENDED)
191 PR_SUSPENDED, "PR_SUSPENDED", "Process suspended",
192 #endif
193 0, NULL, NULL
194 };
195
196 /* Hardware fault translation table. */
197
198 static struct trans faults_table[] =
199 {
200 #if defined (FLTILL)
201 FLTILL, "FLTILL", "Illegal instruction",
202 #endif
203 #if defined (FLTPRIV)
204 FLTPRIV, "FLTPRIV", "Privileged instruction",
205 #endif
206 #if defined (FLTBPT)
207 FLTBPT, "FLTBPT", "Breakpoint trap",
208 #endif
209 #if defined (FLTTRACE)
210 FLTTRACE, "FLTTRACE", "Trace trap",
211 #endif
212 #if defined (FLTACCESS)
213 FLTACCESS, "FLTACCESS", "Memory access fault",
214 #endif
215 #if defined (FLTBOUNDS)
216 FLTBOUNDS, "FLTBOUNDS", "Memory bounds violation",
217 #endif
218 #if defined (FLTIOVF)
219 FLTIOVF, "FLTIOVF", "Integer overflow",
220 #endif
221 #if defined (FLTIZDIV)
222 FLTIZDIV, "FLTIZDIV", "Integer zero divide",
223 #endif
224 #if defined (FLTFPE)
225 FLTFPE, "FLTFPE", "Floating-point exception",
226 #endif
227 #if defined (FLTSTACK)
228 FLTSTACK, "FLTSTACK", "Unrecoverable stack fault",
229 #endif
230 #if defined (FLTPAGE)
231 FLTPAGE, "FLTPAGE", "Recoverable page fault",
232 #endif
233 0, NULL, NULL
234 };
235
236 /* Translation table for signal generation information. See UNIX System
237 V Release 4 Programmer's Reference Manual, siginfo(5). */
238
239 static struct sigcode {
240 int signo;
241 int code;
242 char *codename;
243 char *desc;
244 } siginfo_table[] = {
245 #if defined (SIGILL) && defined (ILL_ILLOPC)
246 SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode",
247 #endif
248 #if defined (SIGILL) && defined (ILL_ILLOPN)
249 SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand",
250 #endif
251 #if defined (SIGILL) && defined (ILL_ILLADR)
252 SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode",
253 #endif
254 #if defined (SIGILL) && defined (ILL_ILLTRP)
255 SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap",
256 #endif
257 #if defined (SIGILL) && defined (ILL_PRVOPC)
258 SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode",
259 #endif
260 #if defined (SIGILL) && defined (ILL_PRVREG)
261 SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register",
262 #endif
263 #if defined (SIGILL) && defined (ILL_COPROC)
264 SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error",
265 #endif
266 #if defined (SIGILL) && defined (ILL_BADSTK)
267 SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error",
268 #endif
269 #if defined (SIGFPE) && defined (FPE_INTDIV)
270 SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero",
271 #endif
272 #if defined (SIGFPE) && defined (FPE_INTOVF)
273 SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow",
274 #endif
275 #if defined (SIGFPE) && defined (FPE_FLTDIV)
276 SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating point divide by zero",
277 #endif
278 #if defined (SIGFPE) && defined (FPE_FLTOVF)
279 SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating point overflow",
280 #endif
281 #if defined (SIGFPE) && defined (FPE_FLTUND)
282 SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating point underflow",
283 #endif
284 #if defined (SIGFPE) && defined (FPE_FLTRES)
285 SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating point inexact result",
286 #endif
287 #if defined (SIGFPE) && defined (FPE_FLTINV)
288 SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating point operation",
289 #endif
290 #if defined (SIGFPE) && defined (FPE_FLTSUB)
291 SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range",
292 #endif
293 #if defined (SIGSEGV) && defined (SEGV_MAPERR)
294 SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object",
295 #endif
296 #if defined (SIGSEGV) && defined (SEGV_ACCERR)
297 SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for object",
298 #endif
299 #if defined (SIGBUS) && defined (BUS_ADRALN)
300 SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment",
301 #endif
302 #if defined (SIGBUS) && defined (BUS_ADRERR)
303 SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Non-existent physical address",
304 #endif
305 #if defined (SIGBUS) && defined (BUS_OBJERR)
306 SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object specific hardware error",
307 #endif
308 #if defined (SIGTRAP) && defined (TRAP_BRKPT)
309 SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint",
310 #endif
311 #if defined (SIGTRAP) && defined (TRAP_TRACE)
312 SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap",
313 #endif
314 #if defined (SIGCLD) && defined (CLD_EXITED)
315 SIGCLD, CLD_EXITED, "CLD_EXITED", "Child has exited",
316 #endif
317 #if defined (SIGCLD) && defined (CLD_KILLED)
318 SIGCLD, CLD_KILLED, "CLD_KILLED", "Child was killed",
319 #endif
320 #if defined (SIGCLD) && defined (CLD_DUMPED)
321 SIGCLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally",
322 #endif
323 #if defined (SIGCLD) && defined (CLD_TRAPPED)
324 SIGCLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped",
325 #endif
326 #if defined (SIGCLD) && defined (CLD_STOPPED)
327 SIGCLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped",
328 #endif
329 #if defined (SIGCLD) && defined (CLD_CONTINUED)
330 SIGCLD, CLD_CONTINUED, "CLD_CONTINUED", "Stopped child had continued",
331 #endif
332 #if defined (SIGPOLL) && defined (POLL_IN)
333 SIGPOLL, POLL_IN, "POLL_IN", "Input input available",
334 #endif
335 #if defined (SIGPOLL) && defined (POLL_OUT)
336 SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available",
337 #endif
338 #if defined (SIGPOLL) && defined (POLL_MSG)
339 SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available",
340 #endif
341 #if defined (SIGPOLL) && defined (POLL_ERR)
342 SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error",
343 #endif
344 #if defined (SIGPOLL) && defined (POLL_PRI)
345 SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available",
346 #endif
347 #if defined (SIGPOLL) && defined (POLL_HUP)
348 SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected",
349 #endif
350 0, 0, NULL, NULL
351 };
352
353 static char *syscall_table[MAX_SYSCALLS];
354
355 /* Prototypes for local functions */
356
357 static void
358 set_proc_siginfo PARAMS ((struct procinfo *, int));
359
360 static void
361 init_syscall_table PARAMS ((void));
362
363 static char *
364 syscallname PARAMS ((int));
365
366 static char *
367 signalname PARAMS ((int));
368
369 static char *
370 errnoname PARAMS ((int));
371
372 static int
373 proc_address_to_fd PARAMS ((struct procinfo *, CORE_ADDR, int));
374
375 static int
376 open_proc_file PARAMS ((int, struct procinfo *, int));
377
378 static void
379 close_proc_file PARAMS ((struct procinfo *));
380
381 static void
382 unconditionally_kill_inferior PARAMS ((struct procinfo *));
383
384 static NORETURN void
385 proc_init_failed PARAMS ((struct procinfo *, char *));
386
387 static void
388 info_proc PARAMS ((char *, int));
389
390 static void
391 info_proc_flags PARAMS ((struct procinfo *, int));
392
393 static void
394 info_proc_stop PARAMS ((struct procinfo *, int));
395
396 static void
397 info_proc_siginfo PARAMS ((struct procinfo *, int));
398
399 static void
400 info_proc_syscalls PARAMS ((struct procinfo *, int));
401
402 static void
403 info_proc_mappings PARAMS ((struct procinfo *, int));
404
405 static void
406 info_proc_signals PARAMS ((struct procinfo *, int));
407
408 static void
409 info_proc_faults PARAMS ((struct procinfo *, int));
410
411 static char *
412 mappingflags PARAMS ((long));
413
414 static char *
415 lookupname PARAMS ((struct trans *, unsigned int, char *));
416
417 static char *
418 lookupdesc PARAMS ((struct trans *, unsigned int));
419
420 static int
421 do_attach PARAMS ((int pid));
422
423 static void
424 do_detach PARAMS ((int siggnal));
425
426 static void
427 procfs_create_inferior PARAMS ((char *, char *, char **));
428
429 static void
430 procfs_notice_signals PARAMS ((int pid));
431
432 static struct procinfo *
433 find_procinfo PARAMS ((pid_t pid, int okfail));
434
435 /* External function prototypes that can't be easily included in any
436 header file because the args are typedefs in system include files. */
437
438 extern void
439 supply_gregset PARAMS ((gregset_t *));
440
441 extern void
442 fill_gregset PARAMS ((gregset_t *, int));
443
444 extern void
445 supply_fpregset PARAMS ((fpregset_t *));
446
447 extern void
448 fill_fpregset PARAMS ((fpregset_t *, int));
449
450 /*
451
452 LOCAL FUNCTION
453
454 find_procinfo -- convert a process id to a struct procinfo
455
456 SYNOPSIS
457
458 static struct procinfo * find_procinfo (pid_t pid, int okfail);
459
460 DESCRIPTION
461
462 Given a process id, look it up in the procinfo chain. Returns
463 a struct procinfo *. If can't find pid, then call error(),
464 unless okfail is set, in which case, return NULL;
465 */
466
467 static struct procinfo *
468 find_procinfo (pid, okfail)
469 pid_t pid;
470 int okfail;
471 {
472 struct procinfo *procinfo;
473
474 for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
475 if (procinfo->pid == pid)
476 return procinfo;
477
478 if (okfail)
479 return NULL;
480
481 error ("procfs (find_procinfo): Couldn't locate pid %d", pid);
482 }
483
484 /*
485
486 LOCAL MACRO
487
488 current_procinfo -- convert inferior_pid to a struct procinfo
489
490 SYNOPSIS
491
492 static struct procinfo * current_procinfo;
493
494 DESCRIPTION
495
496 Looks up inferior_pid in the procinfo chain. Always returns a
497 struct procinfo *. If process can't be found, we error() out.
498 */
499
500 #define current_procinfo find_procinfo (inferior_pid, 0)
501
502 /*
503
504 LOCAL FUNCTION
505
506 add_fd -- Add the fd to the poll/select list
507
508 SYNOPSIS
509
510 static void add_fd (struct procinfo *);
511
512 DESCRIPTION
513
514 Add the fd of the supplied procinfo to the list of fds used for
515 poll/select operations.
516 */
517
518 static void
519 add_fd (pi)
520 struct procinfo *pi;
521 {
522 if (num_poll_list <= 0)
523 poll_list = (struct pollfd *) xmalloc (sizeof (struct pollfd));
524 else
525 poll_list = (struct pollfd *) xrealloc (poll_list,
526 (num_poll_list + 1)
527 * sizeof (struct pollfd));
528 poll_list[num_poll_list].fd = pi->fd;
529 poll_list[num_poll_list].events = POLLPRI;
530
531 num_poll_list++;
532 }
533
534 static void
535 remove_fd (pi)
536 struct procinfo *pi;
537 {
538 int i;
539
540 for (i = 0; i < num_poll_list; i++)
541 {
542 if (poll_list[i].fd == pi->fd)
543 {
544 if (i != num_poll_list - 1)
545 memcpy (poll_list, poll_list + i + 1,
546 (num_poll_list - i - 1) * sizeof (struct pollfd));
547
548 num_poll_list--;
549
550 if (num_poll_list == 0)
551 free (poll_list);
552 else
553 poll_list = (struct pollfd *) xrealloc (poll_list,
554 num_poll_list
555 * sizeof (struct pollfd));
556 return;
557 }
558 }
559 }
560
561 #define LOSING_POLL unixware_sux
562
563 static struct procinfo *
564 wait_fd ()
565 {
566 struct procinfo *pi;
567 int num_fds;
568 int i;
569
570 if (attach_flag)
571 set_sigint_trap (); /* Causes SIGINT to be passed on to the
572 attached process. */
573
574 #ifndef LOSING_POLL
575 num_fds = poll (poll_list, num_poll_list, -1);
576 #else
577 pi = current_procinfo;
578
579 if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
580 {
581 print_sys_errmsg (pi->pathname, errno);
582 error ("PIOCWSTOP failed");
583 }
584 pi->had_event = 1;
585 #endif
586
587 if (attach_flag)
588 clear_sigint_trap();
589
590 #ifndef LOSING_POLL
591
592 if (num_fds <= 0)
593 {
594 print_sys_errmsg ("poll failed\n", errno);
595 error ("Poll failed, returned %d", num_fds);
596 }
597
598 for (i = 0; i < num_poll_list && num_fds > 0; i++)
599 {
600 if ((poll_list[i].revents & (POLLPRI|POLLERR|POLLHUP|POLLNVAL)) == 0)
601 continue;
602 for (pi = procinfo_list; pi; pi = pi->next)
603 {
604 if (poll_list[i].fd == pi->fd)
605 {
606 if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
607 {
608 print_sys_errmsg (pi->pathname, errno);
609 error ("PIOCSTATUS failed");
610 }
611 num_fds--;
612 pi->had_event = 1;
613 break;
614 }
615 }
616 if (!pi)
617 error ("procfs_wait: Couldn't find procinfo for fd %d\n",
618 poll_list[i].fd);
619 }
620 #endif /* LOSING_POLL */
621
622 return pi;
623 }
624
625 /*
626
627 LOCAL FUNCTION
628
629 lookupdesc -- translate a value to a summary desc string
630
631 SYNOPSIS
632
633 static char *lookupdesc (struct trans *transp, unsigned int val);
634
635 DESCRIPTION
636
637 Given a pointer to a translation table and a value to be translated,
638 lookup the desc string and return it.
639 */
640
641 static char *
642 lookupdesc (transp, val)
643 struct trans *transp;
644 unsigned int val;
645 {
646 char *desc;
647
648 for (desc = NULL; transp -> name != NULL; transp++)
649 {
650 if (transp -> value == val)
651 {
652 desc = transp -> desc;
653 break;
654 }
655 }
656
657 /* Didn't find a translation for the specified value, set a default one. */
658
659 if (desc == NULL)
660 {
661 desc = "Unknown";
662 }
663 return (desc);
664 }
665
666 /*
667
668 LOCAL FUNCTION
669
670 lookupname -- translate a value to symbolic name
671
672 SYNOPSIS
673
674 static char *lookupname (struct trans *transp, unsigned int val,
675 char *prefix);
676
677 DESCRIPTION
678
679 Given a pointer to a translation table, a value to be translated,
680 and a default prefix to return if the value can't be translated,
681 match the value with one of the translation table entries and
682 return a pointer to the symbolic name.
683
684 If no match is found it just returns the value as a printable string,
685 with the given prefix. The previous such value, if any, is freed
686 at this time.
687 */
688
689 static char *
690 lookupname (transp, val, prefix)
691 struct trans *transp;
692 unsigned int val;
693 char *prefix;
694 {
695 static char *locbuf;
696 char *name;
697
698 for (name = NULL; transp -> name != NULL; transp++)
699 {
700 if (transp -> value == val)
701 {
702 name = transp -> name;
703 break;
704 }
705 }
706
707 /* Didn't find a translation for the specified value, build a default
708 one using the specified prefix and return it. The lifetime of
709 the value is only until the next one is needed. */
710
711 if (name == NULL)
712 {
713 if (locbuf != NULL)
714 {
715 free (locbuf);
716 }
717 locbuf = xmalloc (strlen (prefix) + 16);
718 sprintf (locbuf, "%s %u", prefix, val);
719 name = locbuf;
720 }
721 return (name);
722 }
723
724 static char *
725 sigcodename (sip)
726 siginfo_t *sip;
727 {
728 struct sigcode *scp;
729 char *name = NULL;
730 static char locbuf[32];
731
732 for (scp = siginfo_table; scp -> codename != NULL; scp++)
733 {
734 if ((scp -> signo == sip -> si_signo) &&
735 (scp -> code == sip -> si_code))
736 {
737 name = scp -> codename;
738 break;
739 }
740 }
741 if (name == NULL)
742 {
743 sprintf (locbuf, "sigcode %u", sip -> si_signo);
744 name = locbuf;
745 }
746 return (name);
747 }
748
749 static char *
750 sigcodedesc (sip)
751 siginfo_t *sip;
752 {
753 struct sigcode *scp;
754 char *desc = NULL;
755
756 for (scp = siginfo_table; scp -> codename != NULL; scp++)
757 {
758 if ((scp -> signo == sip -> si_signo) &&
759 (scp -> code == sip -> si_code))
760 {
761 desc = scp -> desc;
762 break;
763 }
764 }
765 if (desc == NULL)
766 {
767 desc = "Unrecognized signal or trap use";
768 }
769 return (desc);
770 }
771
772 /*
773
774 LOCAL FUNCTION
775
776 syscallname - translate a system call number into a system call name
777
778 SYNOPSIS
779
780 char *syscallname (int syscallnum)
781
782 DESCRIPTION
783
784 Given a system call number, translate it into the printable name
785 of a system call, or into "syscall <num>" if it is an unknown
786 number.
787 */
788
789 static char *
790 syscallname (syscallnum)
791 int syscallnum;
792 {
793 static char locbuf[32];
794 char *rtnval;
795
796 if (syscallnum >= 0 && syscallnum < MAX_SYSCALLS)
797 {
798 rtnval = syscall_table[syscallnum];
799 }
800 else
801 {
802 sprintf (locbuf, "syscall %u", syscallnum);
803 rtnval = locbuf;
804 }
805 return (rtnval);
806 }
807
808 /*
809
810 LOCAL FUNCTION
811
812 init_syscall_table - initialize syscall translation table
813
814 SYNOPSIS
815
816 void init_syscall_table (void)
817
818 DESCRIPTION
819
820 Dynamically initialize the translation table to convert system
821 call numbers into printable system call names. Done once per
822 gdb run, on initialization.
823
824 NOTES
825
826 This is awfully ugly, but preprocessor tricks to make it prettier
827 tend to be nonportable.
828 */
829
830 static void
831 init_syscall_table ()
832 {
833 #if defined (SYS_exit)
834 syscall_table[SYS_exit] = "exit";
835 #endif
836 #if defined (SYS_fork)
837 syscall_table[SYS_fork] = "fork";
838 #endif
839 #if defined (SYS_read)
840 syscall_table[SYS_read] = "read";
841 #endif
842 #if defined (SYS_write)
843 syscall_table[SYS_write] = "write";
844 #endif
845 #if defined (SYS_open)
846 syscall_table[SYS_open] = "open";
847 #endif
848 #if defined (SYS_close)
849 syscall_table[SYS_close] = "close";
850 #endif
851 #if defined (SYS_wait)
852 syscall_table[SYS_wait] = "wait";
853 #endif
854 #if defined (SYS_creat)
855 syscall_table[SYS_creat] = "creat";
856 #endif
857 #if defined (SYS_link)
858 syscall_table[SYS_link] = "link";
859 #endif
860 #if defined (SYS_unlink)
861 syscall_table[SYS_unlink] = "unlink";
862 #endif
863 #if defined (SYS_exec)
864 syscall_table[SYS_exec] = "exec";
865 #endif
866 #if defined (SYS_execv)
867 syscall_table[SYS_execv] = "execv";
868 #endif
869 #if defined (SYS_execve)
870 syscall_table[SYS_execve] = "execve";
871 #endif
872 #if defined (SYS_chdir)
873 syscall_table[SYS_chdir] = "chdir";
874 #endif
875 #if defined (SYS_time)
876 syscall_table[SYS_time] = "time";
877 #endif
878 #if defined (SYS_mknod)
879 syscall_table[SYS_mknod] = "mknod";
880 #endif
881 #if defined (SYS_chmod)
882 syscall_table[SYS_chmod] = "chmod";
883 #endif
884 #if defined (SYS_chown)
885 syscall_table[SYS_chown] = "chown";
886 #endif
887 #if defined (SYS_brk)
888 syscall_table[SYS_brk] = "brk";
889 #endif
890 #if defined (SYS_stat)
891 syscall_table[SYS_stat] = "stat";
892 #endif
893 #if defined (SYS_lseek)
894 syscall_table[SYS_lseek] = "lseek";
895 #endif
896 #if defined (SYS_getpid)
897 syscall_table[SYS_getpid] = "getpid";
898 #endif
899 #if defined (SYS_mount)
900 syscall_table[SYS_mount] = "mount";
901 #endif
902 #if defined (SYS_umount)
903 syscall_table[SYS_umount] = "umount";
904 #endif
905 #if defined (SYS_setuid)
906 syscall_table[SYS_setuid] = "setuid";
907 #endif
908 #if defined (SYS_getuid)
909 syscall_table[SYS_getuid] = "getuid";
910 #endif
911 #if defined (SYS_stime)
912 syscall_table[SYS_stime] = "stime";
913 #endif
914 #if defined (SYS_ptrace)
915 syscall_table[SYS_ptrace] = "ptrace";
916 #endif
917 #if defined (SYS_alarm)
918 syscall_table[SYS_alarm] = "alarm";
919 #endif
920 #if defined (SYS_fstat)
921 syscall_table[SYS_fstat] = "fstat";
922 #endif
923 #if defined (SYS_pause)
924 syscall_table[SYS_pause] = "pause";
925 #endif
926 #if defined (SYS_utime)
927 syscall_table[SYS_utime] = "utime";
928 #endif
929 #if defined (SYS_stty)
930 syscall_table[SYS_stty] = "stty";
931 #endif
932 #if defined (SYS_gtty)
933 syscall_table[SYS_gtty] = "gtty";
934 #endif
935 #if defined (SYS_access)
936 syscall_table[SYS_access] = "access";
937 #endif
938 #if defined (SYS_nice)
939 syscall_table[SYS_nice] = "nice";
940 #endif
941 #if defined (SYS_statfs)
942 syscall_table[SYS_statfs] = "statfs";
943 #endif
944 #if defined (SYS_sync)
945 syscall_table[SYS_sync] = "sync";
946 #endif
947 #if defined (SYS_kill)
948 syscall_table[SYS_kill] = "kill";
949 #endif
950 #if defined (SYS_fstatfs)
951 syscall_table[SYS_fstatfs] = "fstatfs";
952 #endif
953 #if defined (SYS_pgrpsys)
954 syscall_table[SYS_pgrpsys] = "pgrpsys";
955 #endif
956 #if defined (SYS_xenix)
957 syscall_table[SYS_xenix] = "xenix";
958 #endif
959 #if defined (SYS_dup)
960 syscall_table[SYS_dup] = "dup";
961 #endif
962 #if defined (SYS_pipe)
963 syscall_table[SYS_pipe] = "pipe";
964 #endif
965 #if defined (SYS_times)
966 syscall_table[SYS_times] = "times";
967 #endif
968 #if defined (SYS_profil)
969 syscall_table[SYS_profil] = "profil";
970 #endif
971 #if defined (SYS_plock)
972 syscall_table[SYS_plock] = "plock";
973 #endif
974 #if defined (SYS_setgid)
975 syscall_table[SYS_setgid] = "setgid";
976 #endif
977 #if defined (SYS_getgid)
978 syscall_table[SYS_getgid] = "getgid";
979 #endif
980 #if defined (SYS_signal)
981 syscall_table[SYS_signal] = "signal";
982 #endif
983 #if defined (SYS_msgsys)
984 syscall_table[SYS_msgsys] = "msgsys";
985 #endif
986 #if defined (SYS_sys3b)
987 syscall_table[SYS_sys3b] = "sys3b";
988 #endif
989 #if defined (SYS_acct)
990 syscall_table[SYS_acct] = "acct";
991 #endif
992 #if defined (SYS_shmsys)
993 syscall_table[SYS_shmsys] = "shmsys";
994 #endif
995 #if defined (SYS_semsys)
996 syscall_table[SYS_semsys] = "semsys";
997 #endif
998 #if defined (SYS_ioctl)
999 syscall_table[SYS_ioctl] = "ioctl";
1000 #endif
1001 #if defined (SYS_uadmin)
1002 syscall_table[SYS_uadmin] = "uadmin";
1003 #endif
1004 #if defined (SYS_utssys)
1005 syscall_table[SYS_utssys] = "utssys";
1006 #endif
1007 #if defined (SYS_fsync)
1008 syscall_table[SYS_fsync] = "fsync";
1009 #endif
1010 #if defined (SYS_umask)
1011 syscall_table[SYS_umask] = "umask";
1012 #endif
1013 #if defined (SYS_chroot)
1014 syscall_table[SYS_chroot] = "chroot";
1015 #endif
1016 #if defined (SYS_fcntl)
1017 syscall_table[SYS_fcntl] = "fcntl";
1018 #endif
1019 #if defined (SYS_ulimit)
1020 syscall_table[SYS_ulimit] = "ulimit";
1021 #endif
1022 #if defined (SYS_rfsys)
1023 syscall_table[SYS_rfsys] = "rfsys";
1024 #endif
1025 #if defined (SYS_rmdir)
1026 syscall_table[SYS_rmdir] = "rmdir";
1027 #endif
1028 #if defined (SYS_mkdir)
1029 syscall_table[SYS_mkdir] = "mkdir";
1030 #endif
1031 #if defined (SYS_getdents)
1032 syscall_table[SYS_getdents] = "getdents";
1033 #endif
1034 #if defined (SYS_sysfs)
1035 syscall_table[SYS_sysfs] = "sysfs";
1036 #endif
1037 #if defined (SYS_getmsg)
1038 syscall_table[SYS_getmsg] = "getmsg";
1039 #endif
1040 #if defined (SYS_putmsg)
1041 syscall_table[SYS_putmsg] = "putmsg";
1042 #endif
1043 #if defined (SYS_poll)
1044 syscall_table[SYS_poll] = "poll";
1045 #endif
1046 #if defined (SYS_lstat)
1047 syscall_table[SYS_lstat] = "lstat";
1048 #endif
1049 #if defined (SYS_symlink)
1050 syscall_table[SYS_symlink] = "symlink";
1051 #endif
1052 #if defined (SYS_readlink)
1053 syscall_table[SYS_readlink] = "readlink";
1054 #endif
1055 #if defined (SYS_setgroups)
1056 syscall_table[SYS_setgroups] = "setgroups";
1057 #endif
1058 #if defined (SYS_getgroups)
1059 syscall_table[SYS_getgroups] = "getgroups";
1060 #endif
1061 #if defined (SYS_fchmod)
1062 syscall_table[SYS_fchmod] = "fchmod";
1063 #endif
1064 #if defined (SYS_fchown)
1065 syscall_table[SYS_fchown] = "fchown";
1066 #endif
1067 #if defined (SYS_sigprocmask)
1068 syscall_table[SYS_sigprocmask] = "sigprocmask";
1069 #endif
1070 #if defined (SYS_sigsuspend)
1071 syscall_table[SYS_sigsuspend] = "sigsuspend";
1072 #endif
1073 #if defined (SYS_sigaltstack)
1074 syscall_table[SYS_sigaltstack] = "sigaltstack";
1075 #endif
1076 #if defined (SYS_sigaction)
1077 syscall_table[SYS_sigaction] = "sigaction";
1078 #endif
1079 #if defined (SYS_sigpending)
1080 syscall_table[SYS_sigpending] = "sigpending";
1081 #endif
1082 #if defined (SYS_context)
1083 syscall_table[SYS_context] = "context";
1084 #endif
1085 #if defined (SYS_evsys)
1086 syscall_table[SYS_evsys] = "evsys";
1087 #endif
1088 #if defined (SYS_evtrapret)
1089 syscall_table[SYS_evtrapret] = "evtrapret";
1090 #endif
1091 #if defined (SYS_statvfs)
1092 syscall_table[SYS_statvfs] = "statvfs";
1093 #endif
1094 #if defined (SYS_fstatvfs)
1095 syscall_table[SYS_fstatvfs] = "fstatvfs";
1096 #endif
1097 #if defined (SYS_nfssys)
1098 syscall_table[SYS_nfssys] = "nfssys";
1099 #endif
1100 #if defined (SYS_waitsys)
1101 syscall_table[SYS_waitsys] = "waitsys";
1102 #endif
1103 #if defined (SYS_sigsendsys)
1104 syscall_table[SYS_sigsendsys] = "sigsendsys";
1105 #endif
1106 #if defined (SYS_hrtsys)
1107 syscall_table[SYS_hrtsys] = "hrtsys";
1108 #endif
1109 #if defined (SYS_acancel)
1110 syscall_table[SYS_acancel] = "acancel";
1111 #endif
1112 #if defined (SYS_async)
1113 syscall_table[SYS_async] = "async";
1114 #endif
1115 #if defined (SYS_priocntlsys)
1116 syscall_table[SYS_priocntlsys] = "priocntlsys";
1117 #endif
1118 #if defined (SYS_pathconf)
1119 syscall_table[SYS_pathconf] = "pathconf";
1120 #endif
1121 #if defined (SYS_mincore)
1122 syscall_table[SYS_mincore] = "mincore";
1123 #endif
1124 #if defined (SYS_mmap)
1125 syscall_table[SYS_mmap] = "mmap";
1126 #endif
1127 #if defined (SYS_mprotect)
1128 syscall_table[SYS_mprotect] = "mprotect";
1129 #endif
1130 #if defined (SYS_munmap)
1131 syscall_table[SYS_munmap] = "munmap";
1132 #endif
1133 #if defined (SYS_fpathconf)
1134 syscall_table[SYS_fpathconf] = "fpathconf";
1135 #endif
1136 #if defined (SYS_vfork)
1137 syscall_table[SYS_vfork] = "vfork";
1138 #endif
1139 #if defined (SYS_fchdir)
1140 syscall_table[SYS_fchdir] = "fchdir";
1141 #endif
1142 #if defined (SYS_readv)
1143 syscall_table[SYS_readv] = "readv";
1144 #endif
1145 #if defined (SYS_writev)
1146 syscall_table[SYS_writev] = "writev";
1147 #endif
1148 #if defined (SYS_xstat)
1149 syscall_table[SYS_xstat] = "xstat";
1150 #endif
1151 #if defined (SYS_lxstat)
1152 syscall_table[SYS_lxstat] = "lxstat";
1153 #endif
1154 #if defined (SYS_fxstat)
1155 syscall_table[SYS_fxstat] = "fxstat";
1156 #endif
1157 #if defined (SYS_xmknod)
1158 syscall_table[SYS_xmknod] = "xmknod";
1159 #endif
1160 #if defined (SYS_clocal)
1161 syscall_table[SYS_clocal] = "clocal";
1162 #endif
1163 #if defined (SYS_setrlimit)
1164 syscall_table[SYS_setrlimit] = "setrlimit";
1165 #endif
1166 #if defined (SYS_getrlimit)
1167 syscall_table[SYS_getrlimit] = "getrlimit";
1168 #endif
1169 #if defined (SYS_lchown)
1170 syscall_table[SYS_lchown] = "lchown";
1171 #endif
1172 #if defined (SYS_memcntl)
1173 syscall_table[SYS_memcntl] = "memcntl";
1174 #endif
1175 #if defined (SYS_getpmsg)
1176 syscall_table[SYS_getpmsg] = "getpmsg";
1177 #endif
1178 #if defined (SYS_putpmsg)
1179 syscall_table[SYS_putpmsg] = "putpmsg";
1180 #endif
1181 #if defined (SYS_rename)
1182 syscall_table[SYS_rename] = "rename";
1183 #endif
1184 #if defined (SYS_uname)
1185 syscall_table[SYS_uname] = "uname";
1186 #endif
1187 #if defined (SYS_setegid)
1188 syscall_table[SYS_setegid] = "setegid";
1189 #endif
1190 #if defined (SYS_sysconfig)
1191 syscall_table[SYS_sysconfig] = "sysconfig";
1192 #endif
1193 #if defined (SYS_adjtime)
1194 syscall_table[SYS_adjtime] = "adjtime";
1195 #endif
1196 #if defined (SYS_systeminfo)
1197 syscall_table[SYS_systeminfo] = "systeminfo";
1198 #endif
1199 #if defined (SYS_seteuid)
1200 syscall_table[SYS_seteuid] = "seteuid";
1201 #endif
1202 #if defined (SYS_sproc)
1203 syscall_table[SYS_sproc] = "sproc";
1204 #endif
1205 }
1206
1207 /*
1208
1209 GLOBAL FUNCTION
1210
1211 ptrace -- override library version to force errors for /proc version
1212
1213 SYNOPSIS
1214
1215 int ptrace (int request, int pid, PTRACE_ARG3_TYPE arg3, int arg4)
1216
1217 DESCRIPTION
1218
1219 When gdb is configured to use /proc, it should not be calling
1220 or otherwise attempting to use ptrace. In order to catch errors
1221 where use of /proc is configured, but some routine is still calling
1222 ptrace, we provide a local version of a function with that name
1223 that does nothing but issue an error message.
1224 */
1225
1226 int
1227 ptrace (request, pid, arg3, arg4)
1228 int request;
1229 int pid;
1230 PTRACE_ARG3_TYPE arg3;
1231 int arg4;
1232 {
1233 error ("internal error - there is a call to ptrace() somewhere");
1234 /*NOTREACHED*/
1235 }
1236
1237 /*
1238
1239 LOCAL FUNCTION
1240
1241 procfs_kill_inferior - kill any currently inferior
1242
1243 SYNOPSIS
1244
1245 void procfs_kill_inferior (void)
1246
1247 DESCRIPTION
1248
1249 Kill any current inferior.
1250
1251 NOTES
1252
1253 Kills even attached inferiors. Presumably the user has already
1254 been prompted that the inferior is an attached one rather than
1255 one started by gdb. (FIXME?)
1256
1257 */
1258
1259 static void
1260 procfs_kill_inferior ()
1261 {
1262 target_mourn_inferior ();
1263 }
1264
1265 /*
1266
1267 LOCAL FUNCTION
1268
1269 unconditionally_kill_inferior - terminate the inferior
1270
1271 SYNOPSIS
1272
1273 static void unconditionally_kill_inferior (struct procinfo *)
1274
1275 DESCRIPTION
1276
1277 Kill the specified inferior.
1278
1279 NOTE
1280
1281 A possibly useful enhancement would be to first try sending
1282 the inferior a terminate signal, politely asking it to commit
1283 suicide, before we murder it (we could call that
1284 politely_kill_inferior()).
1285
1286 */
1287
1288 static void
1289 unconditionally_kill_inferior (pi)
1290 struct procinfo *pi;
1291 {
1292 int signo;
1293 int ppid;
1294
1295 ppid = pi->prstatus.pr_ppid;
1296
1297 signo = SIGKILL;
1298 ioctl (pi->fd, PIOCKILL, &signo);
1299 close_proc_file (pi);
1300
1301 /* Only wait() for our direct children. Our grandchildren zombies are killed
1302 by the death of their parents. */
1303
1304 if (ppid == getpid())
1305 wait ((int *) 0);
1306 }
1307
1308 /*
1309
1310 LOCAL FUNCTION
1311
1312 procfs_xfer_memory -- copy data to or from inferior memory space
1313
1314 SYNOPSIS
1315
1316 int procfs_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
1317 int dowrite, struct target_ops target)
1318
1319 DESCRIPTION
1320
1321 Copy LEN bytes to/from inferior's memory starting at MEMADDR
1322 from/to debugger memory starting at MYADDR. Copy from inferior
1323 if DOWRITE is zero or to inferior if DOWRITE is nonzero.
1324
1325 Returns the length copied, which is either the LEN argument or
1326 zero. This xfer function does not do partial moves, since procfs_ops
1327 doesn't allow memory operations to cross below us in the target stack
1328 anyway.
1329
1330 NOTES
1331
1332 The /proc interface makes this an almost trivial task.
1333 */
1334
1335 static int
1336 procfs_xfer_memory (memaddr, myaddr, len, dowrite, target)
1337 CORE_ADDR memaddr;
1338 char *myaddr;
1339 int len;
1340 int dowrite;
1341 struct target_ops *target; /* ignored */
1342 {
1343 int nbytes = 0;
1344 struct procinfo *pi;
1345
1346 pi = current_procinfo;
1347
1348 if (lseek(pi->fd, (off_t) memaddr, 0) == (off_t) memaddr)
1349 {
1350 if (dowrite)
1351 {
1352 nbytes = write (pi->fd, myaddr, len);
1353 }
1354 else
1355 {
1356 nbytes = read (pi->fd, myaddr, len);
1357 }
1358 if (nbytes < 0)
1359 {
1360 nbytes = 0;
1361 }
1362 }
1363 return (nbytes);
1364 }
1365
1366 /*
1367
1368 LOCAL FUNCTION
1369
1370 procfs_store_registers -- copy register values back to inferior
1371
1372 SYNOPSIS
1373
1374 void procfs_store_registers (int regno)
1375
1376 DESCRIPTION
1377
1378 Store our current register values back into the inferior. If
1379 REGNO is -1 then store all the register, otherwise store just
1380 the value specified by REGNO.
1381
1382 NOTES
1383
1384 If we are storing only a single register, we first have to get all
1385 the current values from the process, overwrite the desired register
1386 in the gregset with the one we want from gdb's registers, and then
1387 send the whole set back to the process. For writing all the
1388 registers, all we have to do is generate the gregset and send it to
1389 the process.
1390
1391 Also note that the process has to be stopped on an event of interest
1392 for this to work, which basically means that it has to have been
1393 run under the control of one of the other /proc ioctl calls and not
1394 ptrace. Since we don't use ptrace anyway, we don't worry about this
1395 fine point, but it is worth noting for future reference.
1396
1397 Gdb is confused about what this function is supposed to return.
1398 Some versions return a value, others return nothing. Some are
1399 declared to return a value and actually return nothing. Gdb ignores
1400 anything returned. (FIXME)
1401
1402 */
1403
1404 static void
1405 procfs_store_registers (regno)
1406 int regno;
1407 {
1408 struct procinfo *pi;
1409
1410 pi = current_procinfo;
1411
1412 if (regno != -1)
1413 {
1414 ioctl (pi->fd, PIOCGREG, &pi->gregset);
1415 }
1416 fill_gregset (&pi->gregset, regno);
1417 ioctl (pi->fd, PIOCSREG, &pi->gregset);
1418
1419 #if defined (FP0_REGNUM)
1420
1421 /* Now repeat everything using the floating point register set, if the
1422 target has floating point hardware. Since we ignore the returned value,
1423 we'll never know whether it worked or not anyway. */
1424
1425 if (regno != -1)
1426 {
1427 ioctl (pi->fd, PIOCGFPREG, &pi->fpregset);
1428 }
1429 fill_fpregset (&pi->fpregset, regno);
1430 ioctl (pi->fd, PIOCSFPREG, &pi->fpregset);
1431
1432 #endif /* FP0_REGNUM */
1433
1434 }
1435
1436 /*
1437
1438 LOCAL FUNCTION
1439
1440 create_procinfo - initialize access to a /proc entry
1441
1442 SYNOPSIS
1443
1444 void create_procinfo (int pid)
1445
1446 DESCRIPTION
1447
1448 Allocate a procinfo structure, open the /proc file and then sets up
1449 the set of signals and faults that are to be traced.
1450
1451 NOTES
1452
1453 If proc_init_failed ever gets called, control returns to the command
1454 processing loop via the standard error handling code.
1455
1456 */
1457
1458 static void
1459 create_procinfo (pid)
1460 int pid;
1461 {
1462 struct procinfo *pi;
1463
1464 if (find_procinfo (pid, 1))
1465 return; /* All done! It already exists */
1466
1467 pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
1468
1469 if (!open_proc_file (pid, pi, O_RDWR))
1470 proc_init_failed (pi, "can't open process file");
1471
1472 /* Add new process to process info list */
1473
1474 pi->next = procinfo_list;
1475 procinfo_list = pi;
1476
1477 add_fd (pi); /* Add to list for poll/select */
1478
1479 memset ((char *) &pi->prrun, 0, sizeof (pi->prrun));
1480 prfillset (&pi->prrun.pr_trace);
1481 procfs_notice_signals (pid);
1482 prfillset (&pi->prrun.pr_fault);
1483 prdelset (&pi->prrun.pr_fault, FLTPAGE);
1484
1485 if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
1486 proc_init_failed (pi, "PIOCWSTOP failed");
1487
1488 if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault) < 0)
1489 proc_init_failed (pi, "PIOCSFAULT failed");
1490 }
1491
1492 /*
1493
1494 LOCAL FUNCTION
1495
1496 procfs_init_inferior - initialize target vector and access to a
1497 /proc entry
1498
1499 SYNOPSIS
1500
1501 void procfs_init_inferior (int pid)
1502
1503 DESCRIPTION
1504
1505 When gdb starts an inferior, this function is called in the parent
1506 process immediately after the fork. It waits for the child to stop
1507 on the return from the exec system call (the child itself takes care
1508 of ensuring that this is set up), then sets up the set of signals
1509 and faults that are to be traced.
1510
1511 NOTES
1512
1513 If proc_init_failed ever gets called, control returns to the command
1514 processing loop via the standard error handling code.
1515
1516 */
1517
1518 static void
1519 procfs_init_inferior (pid)
1520 int pid;
1521 {
1522 push_target (&procfs_ops);
1523
1524 create_procinfo (pid);
1525 add_thread (pid); /* Setup initial thread */
1526
1527 /* One trap to exec the shell, one to exec the program being debugged. */
1528 startup_inferior (2);
1529 }
1530
1531 /*
1532
1533 GLOBAL FUNCTION
1534
1535 procfs_notice_signals
1536
1537 SYNOPSIS
1538
1539 static void procfs_notice_signals (int pid);
1540
1541 DESCRIPTION
1542
1543 When the user changes the state of gdb's signal handling via the
1544 "handle" command, this function gets called to see if any change
1545 in the /proc interface is required. It is also called internally
1546 by other /proc interface functions to initialize the state of
1547 the traced signal set.
1548
1549 One thing it does is that signals for which the state is "nostop",
1550 "noprint", and "pass", have their trace bits reset in the pr_trace
1551 field, so that they are no longer traced. This allows them to be
1552 delivered directly to the inferior without the debugger ever being
1553 involved.
1554 */
1555
1556 static void
1557 procfs_notice_signals (pid)
1558 int pid;
1559 {
1560 int signo;
1561 struct procinfo *pi;
1562
1563 pi = find_procinfo (pid, 0);
1564
1565 for (signo = 0; signo < NSIG; signo++)
1566 {
1567 if (signal_stop_state (signo) == 0 &&
1568 signal_print_state (signo) == 0 &&
1569 signal_pass_state (signo) == 1)
1570 {
1571 prdelset (&pi->prrun.pr_trace, signo);
1572 }
1573 else
1574 {
1575 praddset (&pi->prrun.pr_trace, signo);
1576 }
1577 }
1578 if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
1579 {
1580 print_sys_errmsg ("PIOCSTRACE failed", errno);
1581 }
1582 }
1583
1584 /*
1585
1586 LOCAL FUNCTION
1587
1588 proc_set_exec_trap -- arrange for exec'd child to halt at startup
1589
1590 SYNOPSIS
1591
1592 void proc_set_exec_trap (void)
1593
1594 DESCRIPTION
1595
1596 This function is called in the child process when starting up
1597 an inferior, prior to doing the exec of the actual inferior.
1598 It sets the child process's exitset to make exit from the exec
1599 system call an event of interest to stop on, and then simply
1600 returns. The child does the exec, the system call returns, and
1601 the child stops at the first instruction, ready for the gdb
1602 parent process to take control of it.
1603
1604 NOTE
1605
1606 We need to use all local variables since the child may be sharing
1607 it's data space with the parent, if vfork was used rather than
1608 fork.
1609
1610 Also note that we want to turn off the inherit-on-fork flag in
1611 the child process so that any grand-children start with all
1612 tracing flags cleared.
1613 */
1614
1615 static void
1616 proc_set_exec_trap ()
1617 {
1618 sysset_t exitset;
1619 sysset_t entryset;
1620 auto char procname[32];
1621 int fd;
1622
1623 sprintf (procname, PROC_NAME_FMT, getpid ());
1624 if ((fd = open (procname, O_RDWR)) < 0)
1625 {
1626 perror (procname);
1627 gdb_flush (gdb_stderr);
1628 _exit (127);
1629 }
1630 premptyset (&exitset);
1631 premptyset (&entryset);
1632
1633 /* GW: Rationale...
1634 Not all systems with /proc have all the exec* syscalls with the same
1635 names. On the SGI, for example, there is no SYS_exec, but there
1636 *is* a SYS_execv. So, we try to account for that. */
1637
1638 #ifdef SYS_exec
1639 praddset (&exitset, SYS_exec);
1640 #endif
1641 #ifdef SYS_execve
1642 praddset (&exitset, SYS_execve);
1643 #endif
1644 #ifdef SYS_execv
1645 praddset (&exitset, SYS_execv);
1646 #endif
1647
1648 if (ioctl (fd, PIOCSEXIT, &exitset) < 0)
1649 {
1650 perror (procname);
1651 gdb_flush (gdb_stderr);
1652 _exit (127);
1653 }
1654
1655 praddset (&entryset, SYS_exit);
1656
1657 if (ioctl (fd, PIOCSENTRY, &entryset) < 0)
1658 {
1659 perror (procname);
1660 gdb_flush (gdb_stderr);
1661 _exit (126);
1662 }
1663
1664 /* Turn off inherit-on-fork flag so that all grand-children of gdb
1665 start with tracing flags cleared. */
1666
1667 #if defined (PIOCRESET) /* New method */
1668 {
1669 long pr_flags;
1670 pr_flags = PR_FORK;
1671 ioctl (fd, PIOCRESET, &pr_flags);
1672 }
1673 #else
1674 #if defined (PIOCRFORK) /* Original method */
1675 ioctl (fd, PIOCRFORK, NULL);
1676 #endif
1677 #endif
1678
1679 /* Turn on run-on-last-close flag so that this process will not hang
1680 if GDB goes away for some reason. */
1681
1682 #if defined (PIOCSET) /* New method */
1683 {
1684 long pr_flags;
1685 pr_flags = PR_RLC;
1686 (void) ioctl (fd, PIOCSET, &pr_flags);
1687 }
1688 #else
1689 #if defined (PIOCSRLC) /* Original method */
1690 (void) ioctl (fd, PIOCSRLC, 0);
1691 #endif
1692 #endif
1693 }
1694
1695 /*
1696
1697 GLOBAL FUNCTION
1698
1699 proc_iterate_over_mappings -- call function for every mapped space
1700
1701 SYNOPSIS
1702
1703 int proc_iterate_over_mappings (int (*func)())
1704
1705 DESCRIPTION
1706
1707 Given a pointer to a function, call that function for every
1708 mapped address space, passing it an open file descriptor for
1709 the file corresponding to that mapped address space (if any)
1710 and the base address of the mapped space. Quit when we hit
1711 the end of the mappings or the function returns nonzero.
1712 */
1713
1714 int
1715 proc_iterate_over_mappings (func)
1716 int (*func) PARAMS ((int, CORE_ADDR));
1717 {
1718 int nmap;
1719 int fd;
1720 int funcstat = 0;
1721 struct prmap *prmaps;
1722 struct prmap *prmap;
1723 struct procinfo *pi;
1724
1725 pi = current_procinfo;
1726
1727 if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
1728 {
1729 prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
1730 if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
1731 {
1732 for (prmap = prmaps; prmap -> pr_size && funcstat == 0; ++prmap)
1733 {
1734 fd = proc_address_to_fd (pi, (CORE_ADDR) prmap -> pr_vaddr, 0);
1735 funcstat = (*func) (fd, (CORE_ADDR) prmap -> pr_vaddr);
1736 close (fd);
1737 }
1738 }
1739 }
1740 return (funcstat);
1741 }
1742
1743 #if 0 /* Currently unused */
1744 /*
1745
1746 GLOBAL FUNCTION
1747
1748 proc_base_address -- find base address for segment containing address
1749
1750 SYNOPSIS
1751
1752 CORE_ADDR proc_base_address (CORE_ADDR addr)
1753
1754 DESCRIPTION
1755
1756 Given an address of a location in the inferior, find and return
1757 the base address of the mapped segment containing that address.
1758
1759 This is used for example, by the shared library support code,
1760 where we have the pc value for some location in the shared library
1761 where we are stopped, and need to know the base address of the
1762 segment containing that address.
1763 */
1764
1765 CORE_ADDR
1766 proc_base_address (addr)
1767 CORE_ADDR addr;
1768 {
1769 int nmap;
1770 struct prmap *prmaps;
1771 struct prmap *prmap;
1772 CORE_ADDR baseaddr = 0;
1773 struct procinfo *pi;
1774
1775 pi = current_procinfo;
1776
1777 if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
1778 {
1779 prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
1780 if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
1781 {
1782 for (prmap = prmaps; prmap -> pr_size; ++prmap)
1783 {
1784 if ((prmap -> pr_vaddr <= (caddr_t) addr) &&
1785 (prmap -> pr_vaddr + prmap -> pr_size > (caddr_t) addr))
1786 {
1787 baseaddr = (CORE_ADDR) prmap -> pr_vaddr;
1788 break;
1789 }
1790 }
1791 }
1792 }
1793 return (baseaddr);
1794 }
1795
1796 #endif /* 0 */
1797
1798 /*
1799
1800 LOCAL FUNCTION
1801
1802 proc_address_to_fd -- return open fd for file mapped to address
1803
1804 SYNOPSIS
1805
1806 int proc_address_to_fd (struct procinfo *pi, CORE_ADDR addr, complain)
1807
1808 DESCRIPTION
1809
1810 Given an address in the current inferior's address space, use the
1811 /proc interface to find an open file descriptor for the file that
1812 this address was mapped in from. Return -1 if there is no current
1813 inferior. Print a warning message if there is an inferior but
1814 the address corresponds to no file (IE a bogus address).
1815
1816 */
1817
1818 static int
1819 proc_address_to_fd (pi, addr, complain)
1820 struct procinfo *pi;
1821 CORE_ADDR addr;
1822 int complain;
1823 {
1824 int fd = -1;
1825
1826 if ((fd = ioctl (pi->fd, PIOCOPENM, (caddr_t *) &addr)) < 0)
1827 {
1828 if (complain)
1829 {
1830 print_sys_errmsg (pi->pathname, errno);
1831 warning ("can't find mapped file for address 0x%x", addr);
1832 }
1833 }
1834 return (fd);
1835 }
1836
1837
1838 /* Attach to process PID, then initialize for debugging it
1839 and wait for the trace-trap that results from attaching. */
1840
1841 static void
1842 procfs_attach (args, from_tty)
1843 char *args;
1844 int from_tty;
1845 {
1846 char *exec_file;
1847 int pid;
1848
1849 if (!args)
1850 error_no_arg ("process-id to attach");
1851
1852 pid = atoi (args);
1853
1854 if (pid == getpid()) /* Trying to masturbate? */
1855 error ("I refuse to debug myself!");
1856
1857 if (from_tty)
1858 {
1859 exec_file = (char *) get_exec_file (0);
1860
1861 if (exec_file)
1862 printf_unfiltered ("Attaching to program `%s', %s\n", exec_file, target_pid_to_str (pid));
1863 else
1864 printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
1865
1866 gdb_flush (gdb_stdout);
1867 }
1868
1869 do_attach (pid);
1870 inferior_pid = pid;
1871 push_target (&procfs_ops);
1872 }
1873
1874
1875 /* Take a program previously attached to and detaches it.
1876 The program resumes execution and will no longer stop
1877 on signals, etc. We'd better not have left any breakpoints
1878 in the program or it'll die when it hits one. For this
1879 to work, it may be necessary for the process to have been
1880 previously attached. It *might* work if the program was
1881 started via the normal ptrace (PTRACE_TRACEME). */
1882
1883 static void
1884 procfs_detach (args, from_tty)
1885 char *args;
1886 int from_tty;
1887 {
1888 int siggnal = 0;
1889
1890 if (from_tty)
1891 {
1892 char *exec_file = get_exec_file (0);
1893 if (exec_file == 0)
1894 exec_file = "";
1895 printf_unfiltered ("Detaching from program: %s %s\n",
1896 exec_file, target_pid_to_str (inferior_pid));
1897 gdb_flush (gdb_stdout);
1898 }
1899 if (args)
1900 siggnal = atoi (args);
1901
1902 do_detach (siggnal);
1903 inferior_pid = 0;
1904 unpush_target (&procfs_ops); /* Pop out of handling an inferior */
1905 }
1906
1907 /* Get ready to modify the registers array. On machines which store
1908 individual registers, this doesn't need to do anything. On machines
1909 which store all the registers in one fell swoop, this makes sure
1910 that registers contains all the registers from the program being
1911 debugged. */
1912
1913 static void
1914 procfs_prepare_to_store ()
1915 {
1916 #ifdef CHILD_PREPARE_TO_STORE
1917 CHILD_PREPARE_TO_STORE ();
1918 #endif
1919 }
1920
1921 /* Print status information about what we're accessing. */
1922
1923 static void
1924 procfs_files_info (ignore)
1925 struct target_ops *ignore;
1926 {
1927 printf_unfiltered ("\tUsing the running image of %s %s via /proc.\n",
1928 attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
1929 }
1930
1931 /* ARGSUSED */
1932 static void
1933 procfs_open (arg, from_tty)
1934 char *arg;
1935 int from_tty;
1936 {
1937 error ("Use the \"run\" command to start a Unix child process.");
1938 }
1939
1940 /*
1941
1942 LOCAL FUNCTION
1943
1944 do_attach -- attach to an already existing process
1945
1946 SYNOPSIS
1947
1948 int do_attach (int pid)
1949
1950 DESCRIPTION
1951
1952 Attach to an already existing process with the specified process
1953 id. If the process is not already stopped, query whether to
1954 stop it or not.
1955
1956 NOTES
1957
1958 The option of stopping at attach time is specific to the /proc
1959 versions of gdb. Versions using ptrace force the attachee
1960 to stop. (I have changed this version to do so, too. All you
1961 have to do is "continue" to make it go on. -- gnu@cygnus.com)
1962
1963 */
1964
1965 static int
1966 do_attach (pid)
1967 int pid;
1968 {
1969 int result;
1970 struct procinfo *pi;
1971
1972 pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
1973
1974 if (!open_proc_file (pid, pi, O_RDWR))
1975 {
1976 free (pi);
1977 perror_with_name (pi->pathname);
1978 /* NOTREACHED */
1979 }
1980
1981 /* Add new process to process info list */
1982
1983 pi->next = procinfo_list;
1984 procinfo_list = pi;
1985
1986 add_fd (pi); /* Add to list for poll/select */
1987
1988 /* Get current status of process and if it is not already stopped,
1989 then stop it. Remember whether or not it was stopped when we first
1990 examined it. */
1991
1992 if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
1993 {
1994 print_sys_errmsg (pi->pathname, errno);
1995 close_proc_file (pi);
1996 error ("PIOCSTATUS failed");
1997 }
1998 if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
1999 {
2000 pi->was_stopped = 1;
2001 }
2002 else
2003 {
2004 pi->was_stopped = 0;
2005 if (1 || query ("Process is currently running, stop it? "))
2006 {
2007 /* Make it run again when we close it. */
2008 #if defined (PIOCSET) /* New method */
2009 {
2010 long pr_flags;
2011 pr_flags = PR_RLC;
2012 result = ioctl (pi->fd, PIOCSET, &pr_flags);
2013 }
2014 #else
2015 #if defined (PIOCSRLC) /* Original method */
2016 result = ioctl (pi->fd, PIOCSRLC, 0);
2017 #endif
2018 #endif
2019 if (result < 0)
2020 {
2021 print_sys_errmsg (pi->pathname, errno);
2022 close_proc_file (pi);
2023 error ("PIOCSRLC or PIOCSET failed");
2024 }
2025 if (ioctl (pi->fd, PIOCSTOP, &pi->prstatus) < 0)
2026 {
2027 print_sys_errmsg (pi->pathname, errno);
2028 close_proc_file (pi);
2029 error ("PIOCSTOP failed");
2030 }
2031 pi->nopass_next_sigstop = 1;
2032 }
2033 else
2034 {
2035 printf_unfiltered ("Ok, gdb will wait for %s to stop.\n", target_pid_to_str (pid));
2036 }
2037 }
2038
2039 /* Remember some things about the inferior that we will, or might, change
2040 so that we can restore them when we detach. */
2041
2042 ioctl (pi->fd, PIOCGTRACE, &pi->saved_trace);
2043 ioctl (pi->fd, PIOCGHOLD, &pi->saved_sighold);
2044 ioctl (pi->fd, PIOCGFAULT, &pi->saved_fltset);
2045 ioctl (pi->fd, PIOCGENTRY, &pi->saved_entryset);
2046 ioctl (pi->fd, PIOCGEXIT, &pi->saved_exitset);
2047
2048 /* Set up trace and fault sets, as gdb expects them. */
2049
2050 memset (&pi->prrun, 0, sizeof (pi->prrun));
2051 prfillset (&pi->prrun.pr_trace);
2052 procfs_notice_signals (pid);
2053 prfillset (&pi->prrun.pr_fault);
2054 prdelset (&pi->prrun.pr_fault, FLTPAGE);
2055 if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault))
2056 {
2057 print_sys_errmsg ("PIOCSFAULT failed", errno);
2058 }
2059 if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
2060 {
2061 print_sys_errmsg ("PIOCSTRACE failed", errno);
2062 }
2063 attach_flag = 1;
2064 return (pid);
2065 }
2066
2067 /*
2068
2069 LOCAL FUNCTION
2070
2071 do_detach -- detach from an attached-to process
2072
2073 SYNOPSIS
2074
2075 void do_detach (int signal)
2076
2077 DESCRIPTION
2078
2079 Detach from the current attachee.
2080
2081 If signal is non-zero, the attachee is started running again and sent
2082 the specified signal.
2083
2084 If signal is zero and the attachee was not already stopped when we
2085 attached to it, then we make it runnable again when we detach.
2086
2087 Otherwise, we query whether or not to make the attachee runnable
2088 again, since we may simply want to leave it in the state it was in
2089 when we attached.
2090
2091 We report any problems, but do not consider them errors, since we
2092 MUST detach even if some things don't seem to go right. This may not
2093 be the ideal situation. (FIXME).
2094 */
2095
2096 static void
2097 do_detach (signal)
2098 int signal;
2099 {
2100 int result;
2101 struct procinfo *pi;
2102
2103 pi = current_procinfo;
2104
2105 if (signal)
2106 {
2107 set_proc_siginfo (pi, signal);
2108 }
2109 if (ioctl (pi->fd, PIOCSEXIT, &pi->saved_exitset) < 0)
2110 {
2111 print_sys_errmsg (pi->pathname, errno);
2112 printf_unfiltered ("PIOCSEXIT failed.\n");
2113 }
2114 if (ioctl (pi->fd, PIOCSENTRY, &pi->saved_entryset) < 0)
2115 {
2116 print_sys_errmsg (pi->pathname, errno);
2117 printf_unfiltered ("PIOCSENTRY failed.\n");
2118 }
2119 if (ioctl (pi->fd, PIOCSTRACE, &pi->saved_trace) < 0)
2120 {
2121 print_sys_errmsg (pi->pathname, errno);
2122 printf_unfiltered ("PIOCSTRACE failed.\n");
2123 }
2124 if (ioctl (pi->fd, PIOCSHOLD, &pi->saved_sighold) < 0)
2125 {
2126 print_sys_errmsg (pi->pathname, errno);
2127 printf_unfiltered ("PIOSCHOLD failed.\n");
2128 }
2129 if (ioctl (pi->fd, PIOCSFAULT, &pi->saved_fltset) < 0)
2130 {
2131 print_sys_errmsg (pi->pathname, errno);
2132 printf_unfiltered ("PIOCSFAULT failed.\n");
2133 }
2134 if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
2135 {
2136 print_sys_errmsg (pi->pathname, errno);
2137 printf_unfiltered ("PIOCSTATUS failed.\n");
2138 }
2139 else
2140 {
2141 if (signal || (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
2142 {
2143 if (signal || !pi->was_stopped ||
2144 query ("Was stopped when attached, make it runnable again? "))
2145 {
2146 /* Clear any fault that might have stopped it. */
2147 if (ioctl (pi->fd, PIOCCFAULT, 0))
2148 {
2149 print_sys_errmsg (pi->pathname, errno);
2150 printf_unfiltered ("PIOCCFAULT failed.\n");
2151 }
2152
2153 /* Make it run again when we close it. */
2154 #if defined (PIOCSET) /* New method */
2155 {
2156 long pr_flags;
2157 pr_flags = PR_RLC;
2158 result = ioctl (pi->fd, PIOCSET, &pr_flags);
2159 }
2160 #else
2161 #if defined (PIOCSRLC) /* Original method */
2162 result = ioctl (pi->fd, PIOCSRLC, 0);
2163 #endif
2164 #endif
2165 if (result)
2166 {
2167 print_sys_errmsg (pi->pathname, errno);
2168 printf_unfiltered ("PIOCSRLC or PIOCSET failed.\n");
2169 }
2170 }
2171 }
2172 }
2173 close_proc_file (pi);
2174 attach_flag = 0;
2175 }
2176
2177 /*
2178
2179 LOCAL FUNCTION
2180
2181 procfs_wait -- emulate wait() as much as possible
2182 Wait for child to do something. Return pid of child, or -1 in case
2183 of error; store status through argument pointer STATUS.
2184
2185
2186 SYNOPSIS
2187
2188 int procfs_wait (int pid, int *statloc)
2189
2190 DESCRIPTION
2191
2192 Try to emulate wait() as much as possible. Not sure why we can't
2193 just use wait(), but it seems to have problems when applied to a
2194 process being controlled with the /proc interface.
2195
2196 NOTES
2197
2198 We have a race problem here with no obvious solution. We need to let
2199 the inferior run until it stops on an event of interest, which means
2200 that we need to use the PIOCWSTOP ioctl. However, we cannot use this
2201 ioctl if the process is already stopped on something that is not an
2202 event of interest, or the call will hang indefinitely. Thus we first
2203 use PIOCSTATUS to see if the process is not stopped. If not, then we
2204 use PIOCWSTOP. But during the window between the two, if the process
2205 stops for any reason that is not an event of interest (such as a job
2206 control signal) then gdb will hang. One possible workaround is to set
2207 an alarm to wake up every minute of so and check to see if the process
2208 is still running, and if so, then reissue the PIOCWSTOP. But this is
2209 a real kludge, so has not been implemented. FIXME: investigate
2210 alternatives.
2211
2212 FIXME: Investigate why wait() seems to have problems with programs
2213 being control by /proc routines.
2214
2215 */
2216
2217 static int
2218 procfs_wait (pid, statloc)
2219 int pid;
2220 int *statloc;
2221 {
2222 short what;
2223 short why;
2224 int statval = 0;
2225 int checkerr = 0;
2226 int rtnval = -1;
2227 struct procinfo *pi;
2228
2229 if (pid != -1) /* Non-specific process? */
2230 pi = NULL;
2231 else
2232 for (pi = procinfo_list; pi; pi = pi->next)
2233 if (pi->had_event)
2234 break;
2235
2236 wait_again:
2237
2238 if (!pi)
2239 pi = wait_fd ();
2240
2241 if (pid != -1)
2242 for (pi = procinfo_list; pi; pi = pi->next)
2243 if (pi->pid == pid && pi->had_event)
2244 break;
2245
2246 if (!pi && !checkerr)
2247 goto wait_again;
2248
2249 if (!checkerr && !(pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
2250 {
2251 if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
2252 {
2253 checkerr++;
2254 }
2255 }
2256 if (checkerr)
2257 {
2258 if (errno == ENOENT)
2259 {
2260 rtnval = wait (&statval);
2261 if (rtnval != inferior_pid)
2262 {
2263 print_sys_errmsg (pi->pathname, errno);
2264 error ("PIOCWSTOP, wait failed, returned %d", rtnval);
2265 /* NOTREACHED */
2266 }
2267 }
2268 else
2269 {
2270 print_sys_errmsg (pi->pathname, errno);
2271 error ("PIOCSTATUS or PIOCWSTOP failed.");
2272 /* NOTREACHED */
2273 }
2274 }
2275 else if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
2276 {
2277 rtnval = pi->prstatus.pr_pid;
2278 why = pi->prstatus.pr_why;
2279 what = pi->prstatus.pr_what;
2280
2281 switch (why)
2282 {
2283 case PR_SIGNALLED:
2284 statval = (what << 8) | 0177;
2285 break;
2286 case PR_SYSENTRY:
2287 if (what != SYS_exit)
2288 error ("PR_SYSENTRY, unknown system call %d", what);
2289
2290 pi->prrun.pr_flags = PRCFAULT;
2291
2292 if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
2293 perror_with_name (pi->pathname);
2294
2295 rtnval = wait (&statval);
2296
2297 break;
2298 case PR_SYSEXIT:
2299 switch (what)
2300 {
2301 #ifdef SYS_exec
2302 case SYS_exec:
2303 #endif
2304 #ifdef SYS_execve
2305 case SYS_execve:
2306 #endif
2307 #ifdef SYS_execv
2308 case SYS_execv:
2309 #endif
2310 statval = (SIGTRAP << 8) | 0177;
2311 break;
2312 #ifdef SYS_sproc
2313 case SYS_sproc:
2314 /* We've just detected the completion of an sproc system call. Now we need to
2315 setup a procinfo struct for this thread, and notify the thread system of the
2316 new arrival. */
2317
2318 /* If sproc failed, then nothing interesting happened. Continue the process and
2319 go back to sleep. */
2320
2321 if (pi->prstatus.pr_errno != 0)
2322 {
2323 pi->prrun.pr_flags &= PRSTEP;
2324 pi->prrun.pr_flags |= PRCFAULT;
2325
2326 if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
2327 perror_with_name (pi->pathname);
2328
2329 goto wait_again;
2330 }
2331
2332 /* At this point, the new thread is stopped at it's first instruction, and
2333 the parent is stopped at the exit from sproc. */
2334
2335 /* Notify the caller of the arrival of a new thread. */
2336 create_procinfo (pi->prstatus.pr_rval1);
2337
2338 rtnval = pi->prstatus.pr_rval1;
2339 statval = (SIGTRAP << 8) | 0177;
2340
2341 break;
2342 #endif /* SYS_sproc */
2343
2344 default:
2345 error ("PIOCSTATUS (PR_SYSEXIT): Unknown system call %d", what);
2346 }
2347 break;
2348 case PR_REQUESTED:
2349 statval = (SIGSTOP << 8) | 0177;
2350 break;
2351 case PR_JOBCONTROL:
2352 statval = (what << 8) | 0177;
2353 break;
2354 case PR_FAULTED:
2355 switch (what)
2356 {
2357 case FLTPRIV:
2358 case FLTILL:
2359 statval = (SIGILL << 8) | 0177;
2360 break;
2361 case FLTBPT:
2362 case FLTTRACE:
2363 statval = (SIGTRAP << 8) | 0177;
2364 break;
2365 case FLTSTACK:
2366 case FLTACCESS:
2367 case FLTBOUNDS:
2368 statval = (SIGSEGV << 8) | 0177;
2369 break;
2370 case FLTIOVF:
2371 case FLTIZDIV:
2372 case FLTFPE:
2373 statval = (SIGFPE << 8) | 0177;
2374 break;
2375 case FLTPAGE: /* Recoverable page fault */
2376 default:
2377 error ("PIOCWSTOP, unknown why %d, what %d", why, what);
2378 }
2379 break;
2380 default:
2381 error ("PIOCWSTOP, unknown why %d, what %d", why, what);
2382 }
2383 /* Stop all the other threads when any of them stops. */
2384
2385 {
2386 struct procinfo *procinfo;
2387
2388 for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
2389 {
2390 if (!procinfo->had_event)
2391 if (ioctl (procinfo->fd, PIOCSTOP, &procinfo->prstatus) < 0)
2392 {
2393 print_sys_errmsg (procinfo->pathname, errno);
2394 error ("PIOCSTOP failed");
2395 }
2396 }
2397 }
2398 }
2399 else
2400 {
2401 error ("PIOCWSTOP, stopped for unknown/unhandled reason, flags %#x",
2402 pi->prstatus.pr_flags);
2403 }
2404
2405 if (statloc)
2406 {
2407 *statloc = statval;
2408 }
2409
2410 if (rtnval == -1) /* No more children to wait for */
2411 {
2412 fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing.\n");
2413 *statloc = 42; /* Claim it exited with signal 42 */
2414 return rtnval;
2415 }
2416
2417 pi->had_event = 0; /* Indicate that we've seen this one */
2418 return (rtnval);
2419 }
2420
2421 /*
2422
2423 LOCAL FUNCTION
2424
2425 set_proc_siginfo - set a process's current signal info
2426
2427 SYNOPSIS
2428
2429 void set_proc_siginfo (struct procinfo *pip, int signo);
2430
2431 DESCRIPTION
2432
2433 Given a pointer to a process info struct in PIP and a signal number
2434 in SIGNO, set the process's current signal and its associated signal
2435 information. The signal will be delivered to the process immediately
2436 after execution is resumed, even if it is being held. In addition,
2437 this particular delivery will not cause another PR_SIGNALLED stop
2438 even if the signal is being traced.
2439
2440 If we are not delivering the same signal that the prstatus siginfo
2441 struct contains information about, then synthesize a siginfo struct
2442 to match the signal we are doing to deliver, make it of the type
2443 "generated by a user process", and send this synthesized copy. When
2444 used to set the inferior's signal state, this will be required if we
2445 are not currently stopped because of a traced signal, or if we decide
2446 to continue with a different signal.
2447
2448 Note that when continuing the inferior from a stop due to receipt
2449 of a traced signal, we either have set PRCSIG to clear the existing
2450 signal, or we have to call this function to do a PIOCSSIG with either
2451 the existing siginfo struct from pr_info, or one we have synthesized
2452 appropriately for the signal we want to deliver. Otherwise if the
2453 signal is still being traced, the inferior will immediately stop
2454 again.
2455
2456 See siginfo(5) for more details.
2457 */
2458
2459 static void
2460 set_proc_siginfo (pip, signo)
2461 struct procinfo *pip;
2462 int signo;
2463 {
2464 struct siginfo newsiginfo;
2465 struct siginfo *sip;
2466
2467 if (signo == pip -> prstatus.pr_info.si_signo)
2468 {
2469 sip = &pip -> prstatus.pr_info;
2470 }
2471 else
2472 {
2473 memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
2474 sip = &newsiginfo;
2475 sip -> si_signo = signo;
2476 sip -> si_code = 0;
2477 sip -> si_errno = 0;
2478 sip -> si_pid = getpid ();
2479 sip -> si_uid = getuid ();
2480 }
2481 if (ioctl (pip -> fd, PIOCSSIG, sip) < 0)
2482 {
2483 print_sys_errmsg (pip -> pathname, errno);
2484 warning ("PIOCSSIG failed");
2485 }
2486 }
2487
2488 /* Resume execution of process PID. If STEP is nozero, then
2489 just single step it. If SIGNAL is nonzero, restart it with that
2490 signal activated. */
2491
2492 static void
2493 procfs_resume (pid, step, signo)
2494 int pid;
2495 int step;
2496 int signo;
2497 {
2498 int signal_to_pass;
2499 struct procinfo *pi, *procinfo;
2500
2501 pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
2502
2503 errno = 0;
2504 pi->prrun.pr_flags = PRSTRACE | PRSFAULT | PRCFAULT;
2505
2506 #if 0
2507 /* It should not be necessary. If the user explicitly changes the value,
2508 value_assign calls write_register_bytes, which writes it. */
2509 /* It may not be absolutely necessary to specify the PC value for
2510 restarting, but to be safe we use the value that gdb considers
2511 to be current. One case where this might be necessary is if the
2512 user explicitly changes the PC value that gdb considers to be
2513 current. FIXME: Investigate if this is necessary or not. */
2514
2515 #ifdef PRSVADDR_BROKEN
2516 /* Can't do this under Solaris running on a Sparc, as there seems to be no
2517 place to put nPC. In fact, if you use this, nPC seems to be set to some
2518 random garbage. We have to rely on the fact that PC and nPC have been
2519 written previously via PIOCSREG during a register flush. */
2520
2521 pi->prrun.pr_vaddr = (caddr_t) *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
2522 pi->prrun.pr_flags != PRSVADDR;
2523 #endif
2524 #endif
2525
2526 if (signo == SIGSTOP && pi->nopass_next_sigstop)
2527 /* When attaching to a child process, if we forced it to stop with
2528 a PIOCSTOP, then we will have set the nopass_next_sigstop flag.
2529 Upon resuming the first time after such a stop, we explicitly
2530 inhibit sending it another SIGSTOP, which would be the normal
2531 result of default signal handling. One potential drawback to
2532 this is that we will also ignore any attempt to by the user
2533 to explicitly continue after the attach with a SIGSTOP. Ultimately
2534 this problem should be dealt with by making the routines that
2535 deal with the inferior a little smarter, and possibly even allow
2536 an inferior to continue running at the same time as gdb. (FIXME?) */
2537 signal_to_pass = 0;
2538 else if (signo == SIGTSTP
2539 && pi->prstatus.pr_cursig == SIGTSTP
2540 && pi->prstatus.pr_action.sa_handler == SIG_DFL)
2541
2542 /* We are about to pass the inferior a SIGTSTP whose action is
2543 SIG_DFL. The SIG_DFL action for a SIGTSTP is to stop
2544 (notifying the parent via wait()), and then keep going from the
2545 same place when the parent is ready for you to keep going. So
2546 under the debugger, it should do nothing (as if the program had
2547 been stopped and then later resumed. Under ptrace, this
2548 happens for us, but under /proc, the system obligingly stops
2549 the process, and wait_for_inferior would have no way of
2550 distinguishing that type of stop (which indicates that we
2551 should just start it again), with a stop due to the pr_trace
2552 field of the prrun_t struct.
2553
2554 Note that if the SIGTSTP is being caught, we *do* need to pass it,
2555 because the handler needs to get executed. */
2556 signal_to_pass = 0;
2557 else
2558 signal_to_pass = signo;
2559
2560 if (signal_to_pass)
2561 {
2562 set_proc_siginfo (pi, signal_to_pass);
2563 }
2564 else
2565 {
2566 pi->prrun.pr_flags |= PRCSIG;
2567 }
2568 pi->nopass_next_sigstop = 0;
2569 if (step)
2570 {
2571 pi->prrun.pr_flags |= PRSTEP;
2572 }
2573 if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
2574 {
2575 perror_with_name (pi->pathname);
2576 /* NOTREACHED */
2577 }
2578
2579 pi->had_event = 0;
2580
2581 /* Continue all the other threads that haven't had an event of
2582 interest. */
2583
2584 if (pid == -1)
2585 for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
2586 {
2587 if (pi != procinfo && !procinfo->had_event)
2588 {
2589 procinfo->prrun.pr_flags &= PRSTEP;
2590 procinfo->prrun.pr_flags |= PRCFAULT | PRCSIG;
2591 ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
2592 if (ioctl (procinfo->fd, PIOCRUN, &procinfo->prrun) < 0)
2593 {
2594 if (ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus) < 0)
2595 {
2596 fprintf_unfiltered(gdb_stderr, "PIOCSTATUS failed, errno=%d\n", errno);
2597 }
2598 print_sys_errmsg (procinfo->pathname, errno);
2599 error ("PIOCRUN failed");
2600 }
2601 ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
2602 }
2603 }
2604 }
2605
2606 /*
2607
2608 LOCAL FUNCTION
2609
2610 procfs_fetch_registers -- fetch current registers from inferior
2611
2612 SYNOPSIS
2613
2614 void procfs_fetch_registers (int regno)
2615
2616 DESCRIPTION
2617
2618 Read the current values of the inferior's registers, both the
2619 general register set and floating point registers (if supported)
2620 and update gdb's idea of their current values.
2621
2622 */
2623
2624 static void
2625 procfs_fetch_registers (regno)
2626 int regno;
2627 {
2628 struct procinfo *pi;
2629
2630 pi = current_procinfo;
2631
2632 if (ioctl (pi->fd, PIOCGREG, &pi->gregset) != -1)
2633 {
2634 supply_gregset (&pi->gregset);
2635 }
2636 #if defined (FP0_REGNUM)
2637 if (ioctl (pi->fd, PIOCGFPREG, &pi->fpregset) != -1)
2638 {
2639 supply_fpregset (&pi->fpregset);
2640 }
2641 #endif
2642 }
2643
2644 /*
2645
2646 LOCAL FUNCTION
2647
2648 proc_init_failed - called whenever /proc access initialization
2649 fails
2650
2651 SYNOPSIS
2652
2653 static void proc_init_failed (struct procinfo *pi, char *why)
2654
2655 DESCRIPTION
2656
2657 This function is called whenever initialization of access to a /proc
2658 entry fails. It prints a suitable error message, does some cleanup,
2659 and then invokes the standard error processing routine which dumps
2660 us back into the command loop.
2661 */
2662
2663 static void
2664 proc_init_failed (pi, why)
2665 struct procinfo *pi;
2666 char *why;
2667 {
2668 print_sys_errmsg (pi->pathname, errno);
2669 kill (pi->pid, SIGKILL);
2670 close_proc_file (pi);
2671 error (why);
2672 /* NOTREACHED */
2673 }
2674
2675 /*
2676
2677 LOCAL FUNCTION
2678
2679 close_proc_file - close any currently open /proc entry
2680
2681 SYNOPSIS
2682
2683 static void close_proc_file (struct procinfo *pip)
2684
2685 DESCRIPTION
2686
2687 Close any currently open /proc entry and mark the process information
2688 entry as invalid. In order to ensure that we don't try to reuse any
2689 stale information, the pid, fd, and pathnames are explicitly
2690 invalidated, which may be overkill.
2691
2692 */
2693
2694 static void
2695 close_proc_file (pip)
2696 struct procinfo *pip;
2697 {
2698 struct procinfo *procinfo;
2699
2700 remove_fd (pip); /* Remove fd from poll/select list */
2701
2702 close (pip -> fd);
2703
2704 free (pip -> pathname);
2705
2706 /* Unlink pip from the procinfo chain. Note pip might not be on the list. */
2707
2708 if (procinfo_list == pip)
2709 procinfo_list = pip->next;
2710 else
2711 for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
2712 if (procinfo->next == pip)
2713 procinfo->next = pip->next;
2714
2715 free (pip);
2716 }
2717
2718 /*
2719
2720 LOCAL FUNCTION
2721
2722 open_proc_file - open a /proc entry for a given process id
2723
2724 SYNOPSIS
2725
2726 static int open_proc_file (int pid, struct procinfo *pip, int mode)
2727
2728 DESCRIPTION
2729
2730 Given a process id and a mode, close the existing open /proc
2731 entry (if any) and open one for the new process id, in the
2732 specified mode. Once it is open, then mark the local process
2733 information structure as valid, which guarantees that the pid,
2734 fd, and pathname fields match an open /proc entry. Returns
2735 zero if the open fails, nonzero otherwise.
2736
2737 Note that the pathname is left intact, even when the open fails,
2738 so that callers can use it to construct meaningful error messages
2739 rather than just "file open failed".
2740 */
2741
2742 static int
2743 open_proc_file (pid, pip, mode)
2744 int pid;
2745 struct procinfo *pip;
2746 int mode;
2747 {
2748 pip -> next = NULL;
2749 pip -> had_event = 0;
2750 pip -> pathname = xmalloc (32);
2751 pip -> pid = pid;
2752
2753 sprintf (pip -> pathname, PROC_NAME_FMT, pid);
2754 if ((pip -> fd = open (pip -> pathname, mode)) < 0)
2755 return 0;
2756
2757 return 1;
2758 }
2759
2760 static char *
2761 mappingflags (flags)
2762 long flags;
2763 {
2764 static char asciiflags[8];
2765
2766 strcpy (asciiflags, "-------");
2767 #if defined (MA_PHYS)
2768 if (flags & MA_PHYS) asciiflags[0] = 'd';
2769 #endif
2770 if (flags & MA_STACK) asciiflags[1] = 's';
2771 if (flags & MA_BREAK) asciiflags[2] = 'b';
2772 if (flags & MA_SHARED) asciiflags[3] = 's';
2773 if (flags & MA_READ) asciiflags[4] = 'r';
2774 if (flags & MA_WRITE) asciiflags[5] = 'w';
2775 if (flags & MA_EXEC) asciiflags[6] = 'x';
2776 return (asciiflags);
2777 }
2778
2779 static void
2780 info_proc_flags (pip, summary)
2781 struct procinfo *pip;
2782 int summary;
2783 {
2784 struct trans *transp;
2785
2786 printf_filtered ("%-32s", "Process status flags:");
2787 if (!summary)
2788 {
2789 printf_filtered ("\n\n");
2790 }
2791 for (transp = pr_flag_table; transp -> name != NULL; transp++)
2792 {
2793 if (pip -> prstatus.pr_flags & transp -> value)
2794 {
2795 if (summary)
2796 {
2797 printf_filtered ("%s ", transp -> name);
2798 }
2799 else
2800 {
2801 printf_filtered ("\t%-16s %s.\n", transp -> name, transp -> desc);
2802 }
2803 }
2804 }
2805 printf_filtered ("\n");
2806 }
2807
2808 static void
2809 info_proc_stop (pip, summary)
2810 struct procinfo *pip;
2811 int summary;
2812 {
2813 struct trans *transp;
2814 int why;
2815 int what;
2816
2817 why = pip -> prstatus.pr_why;
2818 what = pip -> prstatus.pr_what;
2819
2820 if (pip -> prstatus.pr_flags & PR_STOPPED)
2821 {
2822 printf_filtered ("%-32s", "Reason for stopping:");
2823 if (!summary)
2824 {
2825 printf_filtered ("\n\n");
2826 }
2827 for (transp = pr_why_table; transp -> name != NULL; transp++)
2828 {
2829 if (why == transp -> value)
2830 {
2831 if (summary)
2832 {
2833 printf_filtered ("%s ", transp -> name);
2834 }
2835 else
2836 {
2837 printf_filtered ("\t%-16s %s.\n",
2838 transp -> name, transp -> desc);
2839 }
2840 break;
2841 }
2842 }
2843
2844 /* Use the pr_why field to determine what the pr_what field means, and
2845 print more information. */
2846
2847 switch (why)
2848 {
2849 case PR_REQUESTED:
2850 /* pr_what is unused for this case */
2851 break;
2852 case PR_JOBCONTROL:
2853 case PR_SIGNALLED:
2854 if (summary)
2855 {
2856 printf_filtered ("%s ", signalname (what));
2857 }
2858 else
2859 {
2860 printf_filtered ("\t%-16s %s.\n", signalname (what),
2861 safe_strsignal (what));
2862 }
2863 break;
2864 case PR_SYSENTRY:
2865 if (summary)
2866 {
2867 printf_filtered ("%s ", syscallname (what));
2868 }
2869 else
2870 {
2871 printf_filtered ("\t%-16s %s.\n", syscallname (what),
2872 "Entered this system call");
2873 }
2874 break;
2875 case PR_SYSEXIT:
2876 if (summary)
2877 {
2878 printf_filtered ("%s ", syscallname (what));
2879 }
2880 else
2881 {
2882 printf_filtered ("\t%-16s %s.\n", syscallname (what),
2883 "Returned from this system call");
2884 }
2885 break;
2886 case PR_FAULTED:
2887 if (summary)
2888 {
2889 printf_filtered ("%s ",
2890 lookupname (faults_table, what, "fault"));
2891 }
2892 else
2893 {
2894 printf_filtered ("\t%-16s %s.\n",
2895 lookupname (faults_table, what, "fault"),
2896 lookupdesc (faults_table, what));
2897 }
2898 break;
2899 }
2900 printf_filtered ("\n");
2901 }
2902 }
2903
2904 static void
2905 info_proc_siginfo (pip, summary)
2906 struct procinfo *pip;
2907 int summary;
2908 {
2909 struct siginfo *sip;
2910
2911 if ((pip -> prstatus.pr_flags & PR_STOPPED) &&
2912 (pip -> prstatus.pr_why == PR_SIGNALLED ||
2913 pip -> prstatus.pr_why == PR_FAULTED))
2914 {
2915 printf_filtered ("%-32s", "Additional signal/fault info:");
2916 sip = &pip -> prstatus.pr_info;
2917 if (summary)
2918 {
2919 printf_filtered ("%s ", signalname (sip -> si_signo));
2920 if (sip -> si_errno > 0)
2921 {
2922 printf_filtered ("%s ", errnoname (sip -> si_errno));
2923 }
2924 if (sip -> si_code <= 0)
2925 {
2926 printf_filtered ("sent by %s, uid %d ",
2927 target_pid_to_str (sip -> si_pid),
2928 sip -> si_uid);
2929 }
2930 else
2931 {
2932 printf_filtered ("%s ", sigcodename (sip));
2933 if ((sip -> si_signo == SIGILL) ||
2934 (sip -> si_signo == SIGFPE) ||
2935 (sip -> si_signo == SIGSEGV) ||
2936 (sip -> si_signo == SIGBUS))
2937 {
2938 printf_filtered ("addr=%#x ", sip -> si_addr);
2939 }
2940 else if ((sip -> si_signo == SIGCHLD))
2941 {
2942 printf_filtered ("child %s, status %u ",
2943 target_pid_to_str (sip -> si_pid),
2944 sip -> si_status);
2945 }
2946 else if ((sip -> si_signo == SIGPOLL))
2947 {
2948 printf_filtered ("band %u ", sip -> si_band);
2949 }
2950 }
2951 }
2952 else
2953 {
2954 printf_filtered ("\n\n");
2955 printf_filtered ("\t%-16s %s.\n", signalname (sip -> si_signo),
2956 safe_strsignal (sip -> si_signo));
2957 if (sip -> si_errno > 0)
2958 {
2959 printf_filtered ("\t%-16s %s.\n",
2960 errnoname (sip -> si_errno),
2961 safe_strerror (sip -> si_errno));
2962 }
2963 if (sip -> si_code <= 0)
2964 {
2965 printf_filtered ("\t%-16u %s\n", sip -> si_pid, /* XXX need target_pid_to_str() */
2966 "PID of process sending signal");
2967 printf_filtered ("\t%-16u %s\n", sip -> si_uid,
2968 "UID of process sending signal");
2969 }
2970 else
2971 {
2972 printf_filtered ("\t%-16s %s.\n", sigcodename (sip),
2973 sigcodedesc (sip));
2974 if ((sip -> si_signo == SIGILL) ||
2975 (sip -> si_signo == SIGFPE))
2976 {
2977 printf_filtered ("\t%-16#x %s.\n", sip -> si_addr,
2978 "Address of faulting instruction");
2979 }
2980 else if ((sip -> si_signo == SIGSEGV) ||
2981 (sip -> si_signo == SIGBUS))
2982 {
2983 printf_filtered ("\t%-16#x %s.\n", sip -> si_addr,
2984 "Address of faulting memory reference");
2985 }
2986 else if ((sip -> si_signo == SIGCHLD))
2987 {
2988 printf_filtered ("\t%-16u %s.\n", sip -> si_pid, /* XXX need target_pid_to_str() */
2989 "Child process ID");
2990 printf_filtered ("\t%-16u %s.\n", sip -> si_status,
2991 "Child process exit value or signal");
2992 }
2993 else if ((sip -> si_signo == SIGPOLL))
2994 {
2995 printf_filtered ("\t%-16u %s.\n", sip -> si_band,
2996 "Band event for POLL_{IN,OUT,MSG}");
2997 }
2998 }
2999 }
3000 printf_filtered ("\n");
3001 }
3002 }
3003
3004 static void
3005 info_proc_syscalls (pip, summary)
3006 struct procinfo *pip;
3007 int summary;
3008 {
3009 int syscallnum;
3010
3011 if (!summary)
3012 {
3013
3014 #if 0 /* FIXME: Needs to use gdb-wide configured info about system calls. */
3015 if (pip -> prstatus.pr_flags & PR_ASLEEP)
3016 {
3017 int syscallnum = pip -> prstatus.pr_reg[R_D0];
3018 if (summary)
3019 {
3020 printf_filtered ("%-32s", "Sleeping in system call:");
3021 printf_filtered ("%s", syscallname (syscallnum));
3022 }
3023 else
3024 {
3025 printf_filtered ("Sleeping in system call '%s'.\n",
3026 syscallname (syscallnum));
3027 }
3028 }
3029 #endif
3030
3031 if (ioctl (pip -> fd, PIOCGENTRY, &pip -> entryset) < 0)
3032 {
3033 print_sys_errmsg (pip -> pathname, errno);
3034 error ("PIOCGENTRY failed");
3035 }
3036
3037 if (ioctl (pip -> fd, PIOCGEXIT, &pip -> exitset) < 0)
3038 {
3039 print_sys_errmsg (pip -> pathname, errno);
3040 error ("PIOCGEXIT failed");
3041 }
3042
3043 printf_filtered ("System call tracing information:\n\n");
3044
3045 printf_filtered ("\t%-12s %-8s %-8s\n",
3046 "System call",
3047 "Entry",
3048 "Exit");
3049 for (syscallnum = 0; syscallnum < MAX_SYSCALLS; syscallnum++)
3050 {
3051 QUIT;
3052 if (syscall_table[syscallnum] != NULL)
3053 {
3054 printf_filtered ("\t%-12s ", syscall_table[syscallnum]);
3055 printf_filtered ("%-8s ",
3056 prismember (&pip -> entryset, syscallnum)
3057 ? "on" : "off");
3058 printf_filtered ("%-8s ",
3059 prismember (&pip -> exitset, syscallnum)
3060 ? "on" : "off");
3061 printf_filtered ("\n");
3062 }
3063 }
3064 printf_filtered ("\n");
3065 }
3066 }
3067
3068 static char *
3069 signalname (signo)
3070 int signo;
3071 {
3072 char *name;
3073 static char locbuf[32];
3074
3075 name = strsigno (signo);
3076 if (name == NULL)
3077 {
3078 sprintf (locbuf, "Signal %d", signo);
3079 }
3080 else
3081 {
3082 sprintf (locbuf, "%s (%d)", name, signo);
3083 }
3084 return (locbuf);
3085 }
3086
3087 static char *
3088 errnoname (errnum)
3089 int errnum;
3090 {
3091 char *name;
3092 static char locbuf[32];
3093
3094 name = strerrno (errnum);
3095 if (name == NULL)
3096 {
3097 sprintf (locbuf, "Errno %d", errnum);
3098 }
3099 else
3100 {
3101 sprintf (locbuf, "%s (%d)", name, errnum);
3102 }
3103 return (locbuf);
3104 }
3105
3106 static void
3107 info_proc_signals (pip, summary)
3108 struct procinfo *pip;
3109 int summary;
3110 {
3111 int signo;
3112
3113 if (!summary)
3114 {
3115 if (ioctl (pip -> fd, PIOCGTRACE, &pip -> trace) < 0)
3116 {
3117 print_sys_errmsg (pip -> pathname, errno);
3118 error ("PIOCGTRACE failed");
3119 }
3120
3121 printf_filtered ("Disposition of signals:\n\n");
3122 printf_filtered ("\t%-15s %-8s %-8s %-8s %s\n\n",
3123 "Signal", "Trace", "Hold", "Pending", "Description");
3124 for (signo = 0; signo < NSIG; signo++)
3125 {
3126 QUIT;
3127 printf_filtered ("\t%-15s ", signalname (signo));
3128 printf_filtered ("%-8s ",
3129 prismember (&pip -> trace, signo)
3130 ? "on" : "off");
3131 printf_filtered ("%-8s ",
3132 prismember (&pip -> prstatus.pr_sighold, signo)
3133 ? "on" : "off");
3134 printf_filtered ("%-8s ",
3135 prismember (&pip -> prstatus.pr_sigpend, signo)
3136 ? "yes" : "no");
3137 printf_filtered (" %s\n", safe_strsignal (signo));
3138 }
3139 printf_filtered ("\n");
3140 }
3141 }
3142
3143 static void
3144 info_proc_faults (pip, summary)
3145 struct procinfo *pip;
3146 int summary;
3147 {
3148 struct trans *transp;
3149
3150 if (!summary)
3151 {
3152 if (ioctl (pip -> fd, PIOCGFAULT, &pip -> fltset) < 0)
3153 {
3154 print_sys_errmsg (pip -> pathname, errno);
3155 error ("PIOCGFAULT failed");
3156 }
3157
3158 printf_filtered ("Current traced hardware fault set:\n\n");
3159 printf_filtered ("\t%-12s %-8s\n", "Fault", "Trace");
3160
3161 for (transp = faults_table; transp -> name != NULL; transp++)
3162 {
3163 QUIT;
3164 printf_filtered ("\t%-12s ", transp -> name);
3165 printf_filtered ("%-8s", prismember (&pip -> fltset, transp -> value)
3166 ? "on" : "off");
3167 printf_filtered ("\n");
3168 }
3169 printf_filtered ("\n");
3170 }
3171 }
3172
3173 static void
3174 info_proc_mappings (pip, summary)
3175 struct procinfo *pip;
3176 int summary;
3177 {
3178 int nmap;
3179 struct prmap *prmaps;
3180 struct prmap *prmap;
3181
3182 if (!summary)
3183 {
3184 printf_filtered ("Mapped address spaces:\n\n");
3185 printf_filtered ("\t%10s %10s %10s %10s %7s\n",
3186 "Start Addr",
3187 " End Addr",
3188 " Size",
3189 " Offset",
3190 "Flags");
3191 if (ioctl (pip -> fd, PIOCNMAP, &nmap) == 0)
3192 {
3193 prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
3194 if (ioctl (pip -> fd, PIOCMAP, prmaps) == 0)
3195 {
3196 for (prmap = prmaps; prmap -> pr_size; ++prmap)
3197 {
3198 printf_filtered ("\t%#10x %#10x %#10x %#10x %7s\n",
3199 prmap -> pr_vaddr,
3200 prmap -> pr_vaddr + prmap -> pr_size - 1,
3201 prmap -> pr_size,
3202 prmap -> pr_off,
3203 mappingflags (prmap -> pr_mflags));
3204 }
3205 }
3206 }
3207 printf_filtered ("\n");
3208 }
3209 }
3210
3211 /*
3212
3213 LOCAL FUNCTION
3214
3215 info_proc -- implement the "info proc" command
3216
3217 SYNOPSIS
3218
3219 void info_proc (char *args, int from_tty)
3220
3221 DESCRIPTION
3222
3223 Implement gdb's "info proc" command by using the /proc interface
3224 to print status information about any currently running process.
3225
3226 Examples of the use of "info proc" are:
3227
3228 info proc (prints summary info for current inferior)
3229 info proc 123 (prints summary info for process with pid 123)
3230 info proc mappings (prints address mappings)
3231 info proc times (prints process/children times)
3232 info proc id (prints pid, ppid, gid, sid, etc)
3233 FIXME: i proc id not implemented.
3234 info proc status (prints general process state info)
3235 FIXME: i proc status not implemented.
3236 info proc signals (prints info about signal handling)
3237 info proc all (prints all info)
3238
3239 */
3240
3241 static void
3242 info_proc (args, from_tty)
3243 char *args;
3244 int from_tty;
3245 {
3246 int pid;
3247 struct procinfo *pip;
3248 struct cleanup *old_chain;
3249 char **argv;
3250 int argsize;
3251 int summary = 1;
3252 int flags = 0;
3253 int syscalls = 0;
3254 int signals = 0;
3255 int faults = 0;
3256 int mappings = 0;
3257 int times = 0;
3258 int id = 0;
3259 int status = 0;
3260 int all = 0;
3261
3262 old_chain = make_cleanup (null_cleanup, 0);
3263
3264 /* Default to using the current inferior if no pid specified. Note
3265 that inferior_pid may be 0, hence we set okerr. */
3266
3267 pip = find_procinfo (inferior_pid, 1);
3268
3269 if (args != NULL)
3270 {
3271 if ((argv = buildargv (args)) == NULL)
3272 {
3273 nomem (0);
3274 }
3275 make_cleanup (freeargv, (char *) argv);
3276
3277 while (*argv != NULL)
3278 {
3279 argsize = strlen (*argv);
3280 if (argsize >= 1 && strncmp (*argv, "all", argsize) == 0)
3281 {
3282 summary = 0;
3283 all = 1;
3284 }
3285 else if (argsize >= 2 && strncmp (*argv, "faults", argsize) == 0)
3286 {
3287 summary = 0;
3288 faults = 1;
3289 }
3290 else if (argsize >= 2 && strncmp (*argv, "flags", argsize) == 0)
3291 {
3292 summary = 0;
3293 flags = 1;
3294 }
3295 else if (argsize >= 1 && strncmp (*argv, "id", argsize) == 0)
3296 {
3297 summary = 0;
3298 id = 1;
3299 }
3300 else if (argsize >= 1 && strncmp (*argv, "mappings", argsize) == 0)
3301 {
3302 summary = 0;
3303 mappings = 1;
3304 }
3305 else if (argsize >= 2 && strncmp (*argv, "signals", argsize) == 0)
3306 {
3307 summary = 0;
3308 signals = 1;
3309 }
3310 else if (argsize >= 2 && strncmp (*argv, "status", argsize) == 0)
3311 {
3312 summary = 0;
3313 status = 1;
3314 }
3315 else if (argsize >= 2 && strncmp (*argv, "syscalls", argsize) == 0)
3316 {
3317 summary = 0;
3318 syscalls = 1;
3319 }
3320 else if (argsize >= 1 && strncmp (*argv, "times", argsize) == 0)
3321 {
3322 summary = 0;
3323 times = 1;
3324 }
3325 else if ((pid = atoi (*argv)) > 0)
3326 {
3327 pip = (struct procinfo *) xmalloc (sizeof (struct procinfo));
3328 memset (pip, 0, sizeof (*pip));
3329
3330 pip->pid = pid;
3331 if (!open_proc_file (pid, pip, O_RDONLY))
3332 {
3333 perror_with_name (pip -> pathname);
3334 /* NOTREACHED */
3335 }
3336 make_cleanup (close_proc_file, pip);
3337 }
3338 else if (**argv != '\000')
3339 {
3340 error ("Unrecognized or ambiguous keyword `%s'.", *argv);
3341 }
3342 argv++;
3343 }
3344 }
3345
3346 /* If we don't have a valid open process at this point, then we have no
3347 inferior or didn't specify a specific pid. */
3348
3349 if (!pip)
3350 {
3351 error ("\
3352 No process. Start debugging a program or specify an explicit process ID.");
3353 }
3354 if (ioctl (pip -> fd, PIOCSTATUS, &(pip -> prstatus)) < 0)
3355 {
3356 print_sys_errmsg (pip -> pathname, errno);
3357 error ("PIOCSTATUS failed");
3358 }
3359
3360 /* Print verbose information of the requested type(s), or just a summary
3361 of the information for all types. */
3362
3363 printf_filtered ("\nInformation for %s:\n\n", pip -> pathname);
3364 if (summary || all || flags)
3365 {
3366 info_proc_flags (pip, summary);
3367 }
3368 if (summary || all)
3369 {
3370 info_proc_stop (pip, summary);
3371 }
3372 if (summary || all || signals || faults)
3373 {
3374 info_proc_siginfo (pip, summary);
3375 }
3376 if (summary || all || syscalls)
3377 {
3378 info_proc_syscalls (pip, summary);
3379 }
3380 if (summary || all || mappings)
3381 {
3382 info_proc_mappings (pip, summary);
3383 }
3384 if (summary || all || signals)
3385 {
3386 info_proc_signals (pip, summary);
3387 }
3388 if (summary || all || faults)
3389 {
3390 info_proc_faults (pip, summary);
3391 }
3392 printf_filtered ("\n");
3393
3394 /* All done, deal with closing any temporary process info structure,
3395 freeing temporary memory , etc. */
3396
3397 do_cleanups (old_chain);
3398 }
3399
3400 /*
3401
3402 LOCAL FUNCTION
3403
3404 procfs_set_sproc_trap -- arrange for exec'd child stop on sproc
3405
3406 SYNOPSIS
3407
3408 void procfs_set_sproc_trap (void)
3409
3410 DESCRIPTION
3411
3412 This function sets up a trap on sproc system call exits so that we can
3413 detect the arrival of a new thread. We are called with the child
3414 stopped prior to it's first instruction.
3415
3416 Also note that we turn on the inherit-on-fork flag in the child process
3417 so that any grand-children start with all tracing flags set.
3418 */
3419
3420 #ifdef SYS_sproc
3421
3422 static void
3423 procfs_set_sproc_trap (pi)
3424 struct procinfo *pi;
3425 {
3426 sysset_t exitset;
3427
3428 if (ioctl (pi->fd, PIOCGEXIT, &exitset) < 0)
3429 {
3430 print_sys_errmsg (pi->pathname, errno);
3431 error ("PIOCGEXIT failed");
3432 }
3433
3434 praddset (&exitset, SYS_sproc);
3435
3436 if (ioctl (pi->fd, PIOCSEXIT, &exitset) < 0)
3437 {
3438 print_sys_errmsg (pi->pathname, errno);
3439 error ("PIOCSEXIT failed");
3440 }
3441
3442 /* Turn on inherit-on-fork flag so that all grand-children of gdb start with
3443 tracing flags set. */
3444
3445 #ifdef PIOCSET /* New method */
3446 {
3447 long pr_flags;
3448 pr_flags = PR_FORK;
3449 ioctl (pi->fd, PIOCSET, &pr_flags);
3450 }
3451 #else
3452 #ifdef PIOCSFORK /* Original method */
3453 ioctl (pi->fd, PIOCSFORK, NULL);
3454 #endif
3455 #endif
3456 }
3457 #endif /* SYS_sproc */
3458
3459 /* Fork an inferior process, and start debugging it with /proc. */
3460
3461 static void
3462 procfs_create_inferior (exec_file, allargs, env)
3463 char *exec_file;
3464 char *allargs;
3465 char **env;
3466 {
3467 fork_inferior (exec_file, allargs, env,
3468 proc_set_exec_trap, procfs_init_inferior);
3469 /* We are at the first instruction we care about. */
3470 /* Pedal to the metal... */
3471
3472 /* Setup traps on exit from sproc() */
3473
3474 #ifdef SYS_sproc
3475 procfs_set_sproc_trap (current_procinfo);
3476 #endif
3477
3478 proceed ((CORE_ADDR) -1, 0, 0);
3479 }
3480
3481 /* Clean up after the inferior dies. */
3482
3483 static void
3484 procfs_mourn_inferior ()
3485 {
3486 struct procinfo *pi;
3487
3488 for (pi = procinfo_list; pi; pi = pi->next)
3489 unconditionally_kill_inferior (pi);
3490
3491 unpush_target (&procfs_ops);
3492 generic_mourn_inferior ();
3493 }
3494
3495 /* Mark our target-struct as eligible for stray "run" and "attach" commands. */
3496 static int
3497 procfs_can_run ()
3498 {
3499 return(1);
3500 }
3501 \f
3502 struct target_ops procfs_ops = {
3503 "procfs", /* to_shortname */
3504 "Unix /proc child process", /* to_longname */
3505 "Unix /proc child process (started by the \"run\" command).", /* to_doc */
3506 procfs_open, /* to_open */
3507 0, /* to_close */
3508 procfs_attach, /* to_attach */
3509 procfs_detach, /* to_detach */
3510 procfs_resume, /* to_resume */
3511 procfs_wait, /* to_wait */
3512 procfs_fetch_registers, /* to_fetch_registers */
3513 procfs_store_registers, /* to_store_registers */
3514 procfs_prepare_to_store, /* to_prepare_to_store */
3515 procfs_xfer_memory, /* to_xfer_memory */
3516 procfs_files_info, /* to_files_info */
3517 memory_insert_breakpoint, /* to_insert_breakpoint */
3518 memory_remove_breakpoint, /* to_remove_breakpoint */
3519 terminal_init_inferior, /* to_terminal_init */
3520 terminal_inferior, /* to_terminal_inferior */
3521 terminal_ours_for_output, /* to_terminal_ours_for_output */
3522 terminal_ours, /* to_terminal_ours */
3523 child_terminal_info, /* to_terminal_info */
3524 procfs_kill_inferior, /* to_kill */
3525 0, /* to_load */
3526 0, /* to_lookup_symbol */
3527 procfs_create_inferior, /* to_create_inferior */
3528 procfs_mourn_inferior, /* to_mourn_inferior */
3529 procfs_can_run, /* to_can_run */
3530 procfs_notice_signals, /* to_notice_signals */
3531 process_stratum, /* to_stratum */
3532 0, /* to_next */
3533 1, /* to_has_all_memory */
3534 1, /* to_has_memory */
3535 1, /* to_has_stack */
3536 1, /* to_has_registers */
3537 1, /* to_has_execution */
3538 0, /* sections */
3539 0, /* sections_end */
3540 OPS_MAGIC /* to_magic */
3541 };
3542
3543 void
3544 _initialize_procfs ()
3545 {
3546 add_target (&procfs_ops);
3547
3548 add_info ("proc", info_proc,
3549 "Show process status information using /proc entry.\n\
3550 Specify process id or use current inferior by default.\n\
3551 Specify keywords for detailed information; default is summary.\n\
3552 Keywords are: `all', `faults', `flags', `id', `mappings', `signals',\n\
3553 `status', `syscalls', and `times'.\n\
3554 Unambiguous abbreviations may be used.");
3555
3556 init_syscall_table ();
3557 }
GDB Binutils - Deliverables
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