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* gdb.texinfo (Continuing and Stepping): When talking about "step"
[deliverable/binutils-gdb.git] / gdb / procfs.c
CommitLineData
35f5886e 1/* Machine independent support for SVR4 /proc (process file system) for GDB.
ec8ceca3 2 Copyright 1991, 1992 Free Software Foundation, Inc.
35f5886e
FF		 3 Written by Fred Fish at Cygnus Support.
4
5This file is part of GDB.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20
21
22/* N O T E S
23
24For information on the details of using /proc consult section proc(4)
25in the UNIX System V Release 4 System Administrator's Reference Manual.
26
27The general register and floating point register sets are manipulated by
28separate ioctl's. This file makes the assumption that if FP0_REGNUM is
29defined, then support for the floating point register set is desired,
30regardless of whether or not the actual target has floating point hardware.
31
32 */
33
34
5129100c 35#include "defs.h"
35f5886e 36
08f74b92 37#include <sys/types.h>
407a8389 38#include <time.h>
35f5886e
FF		 39#include <sys/procfs.h>
40#include <fcntl.h>
41#include <errno.h>
51b57ded 42#include <string.h>
de43d7d0
SG		 43#include <stropts.h>
44#include <poll.h>
08f74b92
JK		 45#include <unistd.h>
46#include <sys/stat.h>
35f5886e 47
35f5886e
FF		 48#include "inferior.h"
49#include "target.h"
51b57ded 50#include "command.h"
3fbdd536 51#include "gdbcore.h"
cc221e76
FF		 52
53#define MAX_SYSCALLS 256 /* Maximum number of syscalls for table */
35f5886e
FF		 54
55#ifndef PROC_NAME_FMT
6c316cfd 56#define PROC_NAME_FMT "/proc/%05d"
35f5886e
FF		 57#endif
58
3fbdd536
JG		 59extern struct target_ops procfs_ops; /* Forward declaration */
60
35f5886e
FF		 61#if 1 /* FIXME: Gross and ugly hack to resolve coredep.c global */
62CORE_ADDR kernel_u_addr;
63#endif
64
cc221e76
FF		 65#ifdef BROKEN_SIGINFO_H /* Workaround broken SGS <sys/siginfo.h> */
66#undef si_pid
67#define si_pid _data._proc.pid
68#undef si_uid
69#define si_uid _data._proc._pdata._kill.uid
70#endif /* BROKEN_SIGINFO_H */
71
35f5886e
FF		 72/* All access to the inferior, either one started by gdb or one that has
73 been attached to, is controlled by an instance of a procinfo structure,
74 defined below. Since gdb currently only handles one inferior at a time,
a39ad5ce
FF		 75 the procinfo structure for the inferior is statically allocated and
76 only one exists at any given time. There is a separate procinfo
77 structure for use by the "info proc" command, so that we can print
78 useful information about any random process without interfering with
79 the inferior's procinfo information. */
35f5886e
FF		 80
81struct procinfo {
de43d7d0 82 struct procinfo *next;
35f5886e
FF		 83 int pid; /* Process ID of inferior */
84 int fd; /* File descriptor for /proc entry */
85 char *pathname; /* Pathname to /proc entry */
de43d7d0 86 int had_event; /* poll/select says something happened */
35f5886e 87 int was_stopped; /* Nonzero if was stopped prior to attach */
d65eee73 88 int nopass_next_sigstop; /* Don't pass a sigstop on next resume */
35f5886e
FF		 89 prrun_t prrun; /* Control state when it is run */
90 prstatus_t prstatus; /* Current process status info */
91 gregset_t gregset; /* General register set */
92 fpregset_t fpregset; /* Floating point register set */
93 fltset_t fltset; /* Current traced hardware fault set */
94 sigset_t trace; /* Current traced signal set */
95 sysset_t exitset; /* Current traced system call exit set */
96 sysset_t entryset; /* Current traced system call entry set */
cc221e76
FF		 97 fltset_t saved_fltset; /* Saved traced hardware fault set */
98 sigset_t saved_trace; /* Saved traced signal set */
99 sigset_t saved_sighold; /* Saved held signal set */
100 sysset_t saved_exitset; /* Saved traced system call exit set */
101 sysset_t saved_entryset; /* Saved traced system call entry set */
a39ad5ce
FF		 102};
103
de43d7d0
SG		 104/* List of inferior process information */
105static struct procinfo *procinfo_list = NULL;
106
107static struct pollfd *poll_list; /* pollfds used for waiting on /proc */
108
109static int num_poll_list = 0; /* Number of entries in poll_list */
110
111static int last_resume_pid = -1; /* Last pid used with procfs_resume */
35f5886e 112
cc221e76
FF		 113/* Much of the information used in the /proc interface, particularly for
114 printing status information, is kept as tables of structures of the
115 following form. These tables can be used to map numeric values to
116 their symbolic names and to a string that describes their specific use. */
117
118struct trans {
119 int value; /* The numeric value */
120 char *name; /* The equivalent symbolic value */
121 char *desc; /* Short description of value */
122};
123
124/* Translate bits in the pr_flags member of the prstatus structure, into the
125 names and desc information. */
126
127static struct trans pr_flag_table[] =
128{
129#if defined (PR_STOPPED)
130 PR_STOPPED, "PR_STOPPED", "Process is stopped",
131#endif
132#if defined (PR_ISTOP)
133 PR_ISTOP, "PR_ISTOP", "Stopped on an event of interest",
134#endif
135#if defined (PR_DSTOP)
136 PR_DSTOP, "PR_DSTOP", "A stop directive is in effect",
137#endif
138#if defined (PR_ASLEEP)
139 PR_ASLEEP, "PR_ASLEEP", "Sleeping in an interruptible system call",
140#endif
141#if defined (PR_FORK)
142 PR_FORK, "PR_FORK", "Inherit-on-fork is in effect",
143#endif
144#if defined (PR_RLC)
145 PR_RLC, "PR_RLC", "Run-on-last-close is in effect",
146#endif
147#if defined (PR_PTRACE)
148 PR_PTRACE, "PR_PTRACE", "Process is being controlled by ptrace",
149#endif
150#if defined (PR_PCINVAL)
151 PR_PCINVAL, "PR_PCINVAL", "PC refers to an invalid virtual address",
152#endif
153#if defined (PR_ISSYS)
154 PR_ISSYS, "PR_ISSYS", "Is a system process",
5c1c5e67
FF		 155#endif
156#if defined (PR_STEP)
157 PR_STEP, "PR_STEP", "Process has single step pending",
158#endif
159#if defined (PR_KLC)
160 PR_KLC, "PR_KLC", "Kill-on-last-close is in effect",
161#endif
162#if defined (PR_ASYNC)
163 PR_ASYNC, "PR_ASYNC", "Asynchronous stop is in effect",
164#endif
165#if defined (PR_PCOMPAT)
166 PR_PCOMPAT, "PR_PCOMPAT", "Ptrace compatibility mode in effect",
cc221e76
FF		 167#endif
168 0, NULL, NULL
169};
170
171/* Translate values in the pr_why field of the prstatus struct. */
172
173static struct trans pr_why_table[] =
174{
175#if defined (PR_REQUESTED)
176 PR_REQUESTED, "PR_REQUESTED", "Directed to stop via PIOCSTOP/PIOCWSTOP",
177#endif
178#if defined (PR_SIGNALLED)
179 PR_SIGNALLED, "PR_SIGNALLED", "Receipt of a traced signal",
180#endif
181#if defined (PR_FAULTED)
182 PR_FAULTED, "PR_FAULTED", "Incurred a traced hardware fault",
183#endif
184#if defined (PR_SYSENTRY)
185 PR_SYSENTRY, "PR_SYSENTRY", "Entry to a traced system call",
186#endif
187#if defined (PR_SYSEXIT)
188 PR_SYSEXIT, "PR_SYSEXIT", "Exit from a traced system call",
189#endif
190#if defined (PR_JOBCONTROL)
191 PR_JOBCONTROL, "PR_JOBCONTROL", "Default job control stop signal action",
5c1c5e67
FF		 192#endif
193#if defined (PR_SUSPENDED)
194 PR_SUSPENDED, "PR_SUSPENDED", "Process suspended",
cc221e76
FF		 195#endif
196 0, NULL, NULL
197};
198
199/* Hardware fault translation table. */
200
201static struct trans faults_table[] =
202{
203#if defined (FLTILL)
204 FLTILL, "FLTILL", "Illegal instruction",
205#endif
206#if defined (FLTPRIV)
207 FLTPRIV, "FLTPRIV", "Privileged instruction",
208#endif
209#if defined (FLTBPT)
210 FLTBPT, "FLTBPT", "Breakpoint trap",
211#endif
212#if defined (FLTTRACE)
213 FLTTRACE, "FLTTRACE", "Trace trap",
214#endif
215#if defined (FLTACCESS)
216 FLTACCESS, "FLTACCESS", "Memory access fault",
217#endif
218#if defined (FLTBOUNDS)
219 FLTBOUNDS, "FLTBOUNDS", "Memory bounds violation",
220#endif
221#if defined (FLTIOVF)
222 FLTIOVF, "FLTIOVF", "Integer overflow",
223#endif
224#if defined (FLTIZDIV)
225 FLTIZDIV, "FLTIZDIV", "Integer zero divide",
226#endif
227#if defined (FLTFPE)
228 FLTFPE, "FLTFPE", "Floating-point exception",
229#endif
230#if defined (FLTSTACK)
231 FLTSTACK, "FLTSTACK", "Unrecoverable stack fault",
232#endif
233#if defined (FLTPAGE)
234 FLTPAGE, "FLTPAGE", "Recoverable page fault",
235#endif
236 0, NULL, NULL
237};
238
239/* Translation table for signal generation information. See UNIX System
240 V Release 4 Programmer's Reference Manual, siginfo(5). */
241
242static struct sigcode {
243 int signo;
244 int code;
245 char *codename;
246 char *desc;
247} siginfo_table[] = {
248#if defined (SIGILL) && defined (ILL_ILLOPC)
249 SIGILL, ILL_ILLOPC, "ILL_ILLOPC", "Illegal opcode",
250#endif
251#if defined (SIGILL) && defined (ILL_ILLOPN)
252 SIGILL, ILL_ILLOPN, "ILL_ILLOPN", "Illegal operand",
253#endif
254#if defined (SIGILL) && defined (ILL_ILLADR)
255 SIGILL, ILL_ILLADR, "ILL_ILLADR", "Illegal addressing mode",
256#endif
257#if defined (SIGILL) && defined (ILL_ILLTRP)
258 SIGILL, ILL_ILLTRP, "ILL_ILLTRP", "Illegal trap",
259#endif
260#if defined (SIGILL) && defined (ILL_PRVOPC)
261 SIGILL, ILL_PRVOPC, "ILL_PRVOPC", "Privileged opcode",
262#endif
263#if defined (SIGILL) && defined (ILL_PRVREG)
264 SIGILL, ILL_PRVREG, "ILL_PRVREG", "Privileged register",
265#endif
266#if defined (SIGILL) && defined (ILL_COPROC)
267 SIGILL, ILL_COPROC, "ILL_COPROC", "Coprocessor error",
268#endif
269#if defined (SIGILL) && defined (ILL_BADSTK)
270 SIGILL, ILL_BADSTK, "ILL_BADSTK", "Internal stack error",
271#endif
272#if defined (SIGFPE) && defined (FPE_INTDIV)
273 SIGFPE, FPE_INTDIV, "FPE_INTDIV", "Integer divide by zero",
274#endif
275#if defined (SIGFPE) && defined (FPE_INTOVF)
276 SIGFPE, FPE_INTOVF, "FPE_INTOVF", "Integer overflow",
277#endif
278#if defined (SIGFPE) && defined (FPE_FLTDIV)
279 SIGFPE, FPE_FLTDIV, "FPE_FLTDIV", "Floating point divide by zero",
280#endif
281#if defined (SIGFPE) && defined (FPE_FLTOVF)
282 SIGFPE, FPE_FLTOVF, "FPE_FLTOVF", "Floating point overflow",
283#endif
284#if defined (SIGFPE) && defined (FPE_FLTUND)
285 SIGFPE, FPE_FLTUND, "FPE_FLTUND", "Floating point underflow",
286#endif
287#if defined (SIGFPE) && defined (FPE_FLTRES)
288 SIGFPE, FPE_FLTRES, "FPE_FLTRES", "Floating point inexact result",
289#endif
290#if defined (SIGFPE) && defined (FPE_FLTINV)
291 SIGFPE, FPE_FLTINV, "FPE_FLTINV", "Invalid floating point operation",
292#endif
293#if defined (SIGFPE) && defined (FPE_FLTSUB)
294 SIGFPE, FPE_FLTSUB, "FPE_FLTSUB", "Subscript out of range",
295#endif
296#if defined (SIGSEGV) && defined (SEGV_MAPERR)
297 SIGSEGV, SEGV_MAPERR, "SEGV_MAPERR", "Address not mapped to object",
298#endif
299#if defined (SIGSEGV) && defined (SEGV_ACCERR)
300 SIGSEGV, SEGV_ACCERR, "SEGV_ACCERR", "Invalid permissions for object",
301#endif
302#if defined (SIGBUS) && defined (BUS_ADRALN)
303 SIGBUS, BUS_ADRALN, "BUS_ADRALN", "Invalid address alignment",
304#endif
305#if defined (SIGBUS) && defined (BUS_ADRERR)
306 SIGBUS, BUS_ADRERR, "BUS_ADRERR", "Non-existent physical address",
307#endif
308#if defined (SIGBUS) && defined (BUS_OBJERR)
309 SIGBUS, BUS_OBJERR, "BUS_OBJERR", "Object specific hardware error",
310#endif
311#if defined (SIGTRAP) && defined (TRAP_BRKPT)
312 SIGTRAP, TRAP_BRKPT, "TRAP_BRKPT", "Process breakpoint",
313#endif
314#if defined (SIGTRAP) && defined (TRAP_TRACE)
315 SIGTRAP, TRAP_TRACE, "TRAP_TRACE", "Process trace trap",
316#endif
317#if defined (SIGCLD) && defined (CLD_EXITED)
318 SIGCLD, CLD_EXITED, "CLD_EXITED", "Child has exited",
319#endif
320#if defined (SIGCLD) && defined (CLD_KILLED)
321 SIGCLD, CLD_KILLED, "CLD_KILLED", "Child was killed",
322#endif
323#if defined (SIGCLD) && defined (CLD_DUMPED)
324 SIGCLD, CLD_DUMPED, "CLD_DUMPED", "Child has terminated abnormally",
325#endif
326#if defined (SIGCLD) && defined (CLD_TRAPPED)
327 SIGCLD, CLD_TRAPPED, "CLD_TRAPPED", "Traced child has trapped",
328#endif
329#if defined (SIGCLD) && defined (CLD_STOPPED)
330 SIGCLD, CLD_STOPPED, "CLD_STOPPED", "Child has stopped",
331#endif
332#if defined (SIGCLD) && defined (CLD_CONTINUED)
333 SIGCLD, CLD_CONTINUED, "CLD_CONTINUED", "Stopped child had continued",
334#endif
335#if defined (SIGPOLL) && defined (POLL_IN)
336 SIGPOLL, POLL_IN, "POLL_IN", "Input input available",
337#endif
338#if defined (SIGPOLL) && defined (POLL_OUT)
339 SIGPOLL, POLL_OUT, "POLL_OUT", "Output buffers available",
340#endif
341#if defined (SIGPOLL) && defined (POLL_MSG)
342 SIGPOLL, POLL_MSG, "POLL_MSG", "Input message available",
343#endif
344#if defined (SIGPOLL) && defined (POLL_ERR)
345 SIGPOLL, POLL_ERR, "POLL_ERR", "I/O error",
346#endif
347#if defined (SIGPOLL) && defined (POLL_PRI)
348 SIGPOLL, POLL_PRI, "POLL_PRI", "High priority input available",
349#endif
350#if defined (SIGPOLL) && defined (POLL_HUP)
351 SIGPOLL, POLL_HUP, "POLL_HUP", "Device disconnected",
352#endif
353 0, 0, NULL, NULL
354};
355
cc221e76
FF		 356static char *syscall_table[MAX_SYSCALLS];
357
1ab3bf1b
JG		 358/* Prototypes for local functions */
359
6b801388
FF		 360static void
361set_proc_siginfo PARAMS ((struct procinfo *, int));
362
cc221e76
FF		 363static void
364init_syscall_table PARAMS ((void));
365
366static char *
367syscallname PARAMS ((int));
368
369static char *
370signalname PARAMS ((int));
371
4ace50a5
FF		 372static char *
373errnoname PARAMS ((int));
374
1ab3bf1b 375static int
de43d7d0 376proc_address_to_fd PARAMS ((struct procinfo *, CORE_ADDR, int));
1ab3bf1b
JG		 377
378static int
ec8ceca3 379open_proc_file PARAMS ((int, struct procinfo *, int));
1ab3bf1b
JG		 380
381static void
382close_proc_file PARAMS ((struct procinfo *));
383
384static void
de43d7d0 385unconditionally_kill_inferior PARAMS ((struct procinfo *));
1ab3bf1b 386
de43d7d0
SG		 387static NORETURN void
388proc_init_failed PARAMS ((struct procinfo *, char *));
1ab3bf1b
JG		 389
390static void
cc221e76
FF		 391info_proc PARAMS ((char *, int));
392
393static void
394info_proc_flags PARAMS ((struct procinfo *, int));
395
396static void
397info_proc_stop PARAMS ((struct procinfo *, int));
1ab3bf1b
JG		 398
399static void
cc221e76
FF		 400info_proc_siginfo PARAMS ((struct procinfo *, int));
401
402static void
403info_proc_syscalls PARAMS ((struct procinfo *, int));
404
405static void
406info_proc_mappings PARAMS ((struct procinfo *, int));
407
408static void
409info_proc_signals PARAMS ((struct procinfo *, int));
410
411static void
412info_proc_faults PARAMS ((struct procinfo *, int));
1ab3bf1b
JG		 413
414static char *
415mappingflags PARAMS ((long));
416
cc221e76
FF		 417static char *
418lookupname PARAMS ((struct trans *, unsigned int, char *));
419
420static char *
421lookupdesc PARAMS ((struct trans *, unsigned int));
422
3fbdd536
JG		 423static int
424do_attach PARAMS ((int pid));
425
426static void
427do_detach PARAMS ((int siggnal));
428
429static void
430procfs_create_inferior PARAMS ((char *, char *, char **));
431
3950a34e 432static void
952a820e 433procfs_notice_signals PARAMS ((int pid));
de43d7d0
SG		 434
435static struct procinfo *
436find_procinfo PARAMS ((pid_t pid, int okfail));
3950a34e 437
1ab3bf1b
JG		 438/* External function prototypes that can't be easily included in any
439 header file because the args are typedefs in system include files. */
440
441extern void
442supply_gregset PARAMS ((gregset_t *));
443
444extern void
445fill_gregset PARAMS ((gregset_t *, int));
446
447extern void
448supply_fpregset PARAMS ((fpregset_t *));
449
450extern void
451fill_fpregset PARAMS ((fpregset_t *, int));
35f5886e 452
cc221e76
FF		 453/*
454
de43d7d0
SG		 455LOCAL FUNCTION
456
457 find_procinfo -- convert a process id to a struct procinfo
458
459SYNOPSIS
460
461 static struct procinfo * find_procinfo (pid_t pid, int okfail);
462
463DESCRIPTION
464
465 Given a process id, look it up in the procinfo chain. Returns
466 a struct procinfo *. If can't find pid, then call error(),
467 unless okfail is set, in which case, return NULL;
468 */
469
470static struct procinfo *
471find_procinfo (pid, okfail)
472 pid_t pid;
473 int okfail;
474{
475 struct procinfo *procinfo;
476
477 for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
478 if (procinfo->pid == pid)
479 return procinfo;
480
481 if (okfail)
482 return NULL;
483
484 error ("procfs (find_procinfo): Couldn't locate pid %d", pid);
485}
486
487/*
488
7c5d526e
SG		 489LOCAL MACRO
490
491 current_procinfo -- convert inferior_pid to a struct procinfo
492
493SYNOPSIS
494
495 static struct procinfo * current_procinfo;
496
497DESCRIPTION
498
499 Looks up inferior_pid in the procinfo chain. Always returns a
500 struct procinfo *. If process can't be found, we error() out.
501 */
502
503#define current_procinfo find_procinfo (inferior_pid, 0)
504
505/*
506
de43d7d0
SG		 507LOCAL FUNCTION
508
509 add_fd -- Add the fd to the poll/select list
510
511SYNOPSIS
512
513 static void add_fd (struct procinfo *);
514
515DESCRIPTION
516
517 Add the fd of the supplied procinfo to the list of fds used for
518 poll/select operations.
519 */
520
521static void
522add_fd (pi)
523 struct procinfo *pi;
524{
525 if (num_poll_list <= 0)
526 poll_list = (struct pollfd *) xmalloc (sizeof (struct pollfd));
527 else
528 poll_list = (struct pollfd *) xrealloc (poll_list,
529 (num_poll_list + 1)
530 * sizeof (struct pollfd));
531 poll_list[num_poll_list].fd = pi->fd;
532 poll_list[num_poll_list].events = POLLPRI;
533
534 num_poll_list++;
535}
536
537static void
538remove_fd (pi)
539 struct procinfo *pi;
540{
541 int i;
542
543 for (i = 0; i < num_poll_list; i++)
544 {
545 if (poll_list[i].fd == pi->fd)
546 {
547 if (i != num_poll_list - 1)
548 memcpy (poll_list, poll_list + i + 1,
549 (num_poll_list - i - 1) * sizeof (struct pollfd));
550
551 num_poll_list--;
552
553 if (num_poll_list == 0)
554 free (poll_list);
555 else
556 poll_list = (struct pollfd *) xrealloc (poll_list,
557 num_poll_list
558 * sizeof (struct pollfd));
559 return;
560 }
561 }
562}
563
7c5d526e 564#define LOSING_POLL unixware_sux
de43d7d0 565
7c5d526e
SG		 566static struct procinfo *
567wait_fd ()
568{
569 struct procinfo *pi;
570 int num_fds;
571 int i;
de43d7d0 572
7c5d526e
SG		 573 if (attach_flag)
574 set_sigint_trap (); /* Causes SIGINT to be passed on to the
575 attached process. */
de43d7d0 576
7c5d526e
SG		 577#ifndef LOSING_POLL
578 num_fds = poll (poll_list, num_poll_list, -1);
579#else
580 pi = current_procinfo;
de43d7d0 581
8afd05c0 582 while (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
7c5d526e 583 {
8afd05c0
JK		 584 if (errno != EINTR)
585 {
586 print_sys_errmsg (pi->pathname, errno);
587 error ("PIOCWSTOP failed");
588 }
7c5d526e 589 }
fb63d460 590 pi->had_event = 1;
7c5d526e
SG		 591#endif
592
593 if (attach_flag)
594 clear_sigint_trap();
de43d7d0 595
7c5d526e 596#ifndef LOSING_POLL
de43d7d0 597
7c5d526e
SG		 598 if (num_fds <= 0)
599 {
600 print_sys_errmsg ("poll failed\n", errno);
601 error ("Poll failed, returned %d", num_fds);
602 }
603
604 for (i = 0; i < num_poll_list && num_fds > 0; i++)
605 {
606 if ((poll_list[i].revents & (POLLPRI|POLLERR|POLLHUP|POLLNVAL)) == 0)
607 continue;
608 for (pi = procinfo_list; pi; pi = pi->next)
609 {
610 if (poll_list[i].fd == pi->fd)
611 {
612 if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
613 {
614 print_sys_errmsg (pi->pathname, errno);
615 error ("PIOCSTATUS failed");
616 }
617 num_fds--;
618 pi->had_event = 1;
619 break;
620 }
621 }
622 if (!pi)
623 error ("procfs_wait: Couldn't find procinfo for fd %d\n",
624 poll_list[i].fd);
625 }
626#endif /* LOSING_POLL */
627
628 return pi;
629}
de43d7d0
SG		 630
631/*
632
cc221e76
FF		 633LOCAL FUNCTION
634
635 lookupdesc -- translate a value to a summary desc string
636
637SYNOPSIS
638
639 static char *lookupdesc (struct trans *transp, unsigned int val);
640
641DESCRIPTION
642
643 Given a pointer to a translation table and a value to be translated,
644 lookup the desc string and return it.
645 */
646
647static char *
648lookupdesc (transp, val)
649 struct trans *transp;
650 unsigned int val;
651{
652 char *desc;
653
654 for (desc = NULL; transp -> name != NULL; transp++)
655 {
656 if (transp -> value == val)
657 {
658 desc = transp -> desc;
659 break;
660 }
661 }
662
663 /* Didn't find a translation for the specified value, set a default one. */
664
665 if (desc == NULL)
666 {
667 desc = "Unknown";
668 }
669 return (desc);
670}
671
672/*
673
674LOCAL FUNCTION
675
676 lookupname -- translate a value to symbolic name
677
678SYNOPSIS
679
680 static char *lookupname (struct trans *transp, unsigned int val,
681 char *prefix);
682
683DESCRIPTION
684
685 Given a pointer to a translation table, a value to be translated,
686 and a default prefix to return if the value can't be translated,
687 match the value with one of the translation table entries and
688 return a pointer to the symbolic name.
689
690 If no match is found it just returns the value as a printable string,
691 with the given prefix. The previous such value, if any, is freed
692 at this time.
693 */
694
695static char *
696lookupname (transp, val, prefix)
697 struct trans *transp;
698 unsigned int val;
699 char *prefix;
700{
701 static char *locbuf;
702 char *name;
703
704 for (name = NULL; transp -> name != NULL; transp++)
705 {
706 if (transp -> value == val)
707 {
708 name = transp -> name;
709 break;
710 }
711 }
712
713 /* Didn't find a translation for the specified value, build a default
714 one using the specified prefix and return it. The lifetime of
715 the value is only until the next one is needed. */
716
717 if (name == NULL)
718 {
719 if (locbuf != NULL)
720 {
721 free (locbuf);
722 }
723 locbuf = xmalloc (strlen (prefix) + 16);
4ed3a9ea 724 sprintf (locbuf, "%s %u", prefix, val);
cc221e76
FF		 725 name = locbuf;
726 }
727 return (name);
728}
729
730static char *
731sigcodename (sip)
732 siginfo_t *sip;
733{
734 struct sigcode *scp;
735 char *name = NULL;
736 static char locbuf[32];
737
738 for (scp = siginfo_table; scp -> codename != NULL; scp++)
739 {
740 if ((scp -> signo == sip -> si_signo) &&
741 (scp -> code == sip -> si_code))
742 {
743 name = scp -> codename;
744 break;
745 }
746 }
747 if (name == NULL)
748 {
4ed3a9ea 749 sprintf (locbuf, "sigcode %u", sip -> si_signo);
cc221e76
FF		 750 name = locbuf;
751 }
752 return (name);
753}
754
3fbdd536
JG		 755static char *
756sigcodedesc (sip)
cc221e76
FF		 757 siginfo_t *sip;
758{
759 struct sigcode *scp;
760 char *desc = NULL;
761
762 for (scp = siginfo_table; scp -> codename != NULL; scp++)
763 {
764 if ((scp -> signo == sip -> si_signo) &&
765 (scp -> code == sip -> si_code))
766 {
767 desc = scp -> desc;
768 break;
769 }
770 }
771 if (desc == NULL)
772 {
773 desc = "Unrecognized signal or trap use";
774 }
775 return (desc);
776}
777
778/*
779
780LOCAL FUNCTION
781
782 syscallname - translate a system call number into a system call name
783
784SYNOPSIS
785
786 char *syscallname (int syscallnum)
787
788DESCRIPTION
789
790 Given a system call number, translate it into the printable name
791 of a system call, or into "syscall <num>" if it is an unknown
792 number.
793 */
794
795static char *
796syscallname (syscallnum)
797 int syscallnum;
798{
799 static char locbuf[32];
800 char *rtnval;
801
802 if (syscallnum >= 0 && syscallnum < MAX_SYSCALLS)
803 {
804 rtnval = syscall_table[syscallnum];
805 }
806 else
807 {
4ed3a9ea 808 sprintf (locbuf, "syscall %u", syscallnum);
cc221e76
FF		 809 rtnval = locbuf;
810 }
811 return (rtnval);
812}
813
814/*
815
816LOCAL FUNCTION
817
818 init_syscall_table - initialize syscall translation table
819
820SYNOPSIS
821
822 void init_syscall_table (void)
823
824DESCRIPTION
825
826 Dynamically initialize the translation table to convert system
827 call numbers into printable system call names. Done once per
828 gdb run, on initialization.
829
830NOTES
831
832 This is awfully ugly, but preprocessor tricks to make it prettier
833 tend to be nonportable.
834 */
835
836static void
837init_syscall_table ()
838{
cc221e76
FF		 839#if defined (SYS_exit)
840 syscall_table[SYS_exit] = "exit";
841#endif
842#if defined (SYS_fork)
843 syscall_table[SYS_fork] = "fork";
844#endif
845#if defined (SYS_read)
846 syscall_table[SYS_read] = "read";
847#endif
848#if defined (SYS_write)
849 syscall_table[SYS_write] = "write";
850#endif
851#if defined (SYS_open)
852 syscall_table[SYS_open] = "open";
853#endif
854#if defined (SYS_close)
855 syscall_table[SYS_close] = "close";
856#endif
857#if defined (SYS_wait)
858 syscall_table[SYS_wait] = "wait";
859#endif
860#if defined (SYS_creat)
861 syscall_table[SYS_creat] = "creat";
862#endif
863#if defined (SYS_link)
864 syscall_table[SYS_link] = "link";
865#endif
866#if defined (SYS_unlink)
867 syscall_table[SYS_unlink] = "unlink";
868#endif
869#if defined (SYS_exec)
870 syscall_table[SYS_exec] = "exec";
871#endif
872#if defined (SYS_execv)
873 syscall_table[SYS_execv] = "execv";
874#endif
875#if defined (SYS_execve)
876 syscall_table[SYS_execve] = "execve";
877#endif
878#if defined (SYS_chdir)
879 syscall_table[SYS_chdir] = "chdir";
880#endif
881#if defined (SYS_time)
882 syscall_table[SYS_time] = "time";
883#endif
884#if defined (SYS_mknod)
885 syscall_table[SYS_mknod] = "mknod";
886#endif
887#if defined (SYS_chmod)
888 syscall_table[SYS_chmod] = "chmod";
889#endif
890#if defined (SYS_chown)
891 syscall_table[SYS_chown] = "chown";
892#endif
893#if defined (SYS_brk)
894 syscall_table[SYS_brk] = "brk";
895#endif
896#if defined (SYS_stat)
897 syscall_table[SYS_stat] = "stat";
898#endif
899#if defined (SYS_lseek)
900 syscall_table[SYS_lseek] = "lseek";
901#endif
902#if defined (SYS_getpid)
903 syscall_table[SYS_getpid] = "getpid";
904#endif
905#if defined (SYS_mount)
906 syscall_table[SYS_mount] = "mount";
907#endif
908#if defined (SYS_umount)
909 syscall_table[SYS_umount] = "umount";
910#endif
911#if defined (SYS_setuid)
912 syscall_table[SYS_setuid] = "setuid";
913#endif
914#if defined (SYS_getuid)
915 syscall_table[SYS_getuid] = "getuid";
916#endif
917#if defined (SYS_stime)
918 syscall_table[SYS_stime] = "stime";
919#endif
920#if defined (SYS_ptrace)
921 syscall_table[SYS_ptrace] = "ptrace";
922#endif
923#if defined (SYS_alarm)
924 syscall_table[SYS_alarm] = "alarm";
925#endif
926#if defined (SYS_fstat)
927 syscall_table[SYS_fstat] = "fstat";
928#endif
929#if defined (SYS_pause)
930 syscall_table[SYS_pause] = "pause";
931#endif
932#if defined (SYS_utime)
933 syscall_table[SYS_utime] = "utime";
934#endif
935#if defined (SYS_stty)
936 syscall_table[SYS_stty] = "stty";
937#endif
938#if defined (SYS_gtty)
939 syscall_table[SYS_gtty] = "gtty";
940#endif
941#if defined (SYS_access)
942 syscall_table[SYS_access] = "access";
943#endif
944#if defined (SYS_nice)
945 syscall_table[SYS_nice] = "nice";
946#endif
947#if defined (SYS_statfs)
948 syscall_table[SYS_statfs] = "statfs";
949#endif
950#if defined (SYS_sync)
951 syscall_table[SYS_sync] = "sync";
952#endif
953#if defined (SYS_kill)
954 syscall_table[SYS_kill] = "kill";
955#endif
956#if defined (SYS_fstatfs)
957 syscall_table[SYS_fstatfs] = "fstatfs";
958#endif
959#if defined (SYS_pgrpsys)
960 syscall_table[SYS_pgrpsys] = "pgrpsys";
961#endif
962#if defined (SYS_xenix)
963 syscall_table[SYS_xenix] = "xenix";
964#endif
965#if defined (SYS_dup)
966 syscall_table[SYS_dup] = "dup";
967#endif
968#if defined (SYS_pipe)
969 syscall_table[SYS_pipe] = "pipe";
970#endif
971#if defined (SYS_times)
972 syscall_table[SYS_times] = "times";
973#endif
974#if defined (SYS_profil)
975 syscall_table[SYS_profil] = "profil";
976#endif
977#if defined (SYS_plock)
978 syscall_table[SYS_plock] = "plock";
979#endif
980#if defined (SYS_setgid)
981 syscall_table[SYS_setgid] = "setgid";
982#endif
983#if defined (SYS_getgid)
984 syscall_table[SYS_getgid] = "getgid";
985#endif
986#if defined (SYS_signal)
987 syscall_table[SYS_signal] = "signal";
988#endif
989#if defined (SYS_msgsys)
990 syscall_table[SYS_msgsys] = "msgsys";
991#endif
992#if defined (SYS_sys3b)
993 syscall_table[SYS_sys3b] = "sys3b";
994#endif
995#if defined (SYS_acct)
996 syscall_table[SYS_acct] = "acct";
997#endif
998#if defined (SYS_shmsys)
999 syscall_table[SYS_shmsys] = "shmsys";
1000#endif
1001#if defined (SYS_semsys)
1002 syscall_table[SYS_semsys] = "semsys";
1003#endif
1004#if defined (SYS_ioctl)
1005 syscall_table[SYS_ioctl] = "ioctl";
1006#endif
1007#if defined (SYS_uadmin)
1008 syscall_table[SYS_uadmin] = "uadmin";
1009#endif
1010#if defined (SYS_utssys)
1011 syscall_table[SYS_utssys] = "utssys";
1012#endif
1013#if defined (SYS_fsync)
1014 syscall_table[SYS_fsync] = "fsync";
1015#endif
1016#if defined (SYS_umask)
1017 syscall_table[SYS_umask] = "umask";
1018#endif
1019#if defined (SYS_chroot)
1020 syscall_table[SYS_chroot] = "chroot";
1021#endif
1022#if defined (SYS_fcntl)
1023 syscall_table[SYS_fcntl] = "fcntl";
1024#endif
1025#if defined (SYS_ulimit)
1026 syscall_table[SYS_ulimit] = "ulimit";
1027#endif
1028#if defined (SYS_rfsys)
1029 syscall_table[SYS_rfsys] = "rfsys";
1030#endif
1031#if defined (SYS_rmdir)
1032 syscall_table[SYS_rmdir] = "rmdir";
1033#endif
1034#if defined (SYS_mkdir)
1035 syscall_table[SYS_mkdir] = "mkdir";
1036#endif
1037#if defined (SYS_getdents)
1038 syscall_table[SYS_getdents] = "getdents";
1039#endif
1040#if defined (SYS_sysfs)
1041 syscall_table[SYS_sysfs] = "sysfs";
1042#endif
1043#if defined (SYS_getmsg)
1044 syscall_table[SYS_getmsg] = "getmsg";
1045#endif
1046#if defined (SYS_putmsg)
1047 syscall_table[SYS_putmsg] = "putmsg";
1048#endif
1049#if defined (SYS_poll)
1050 syscall_table[SYS_poll] = "poll";
1051#endif
1052#if defined (SYS_lstat)
1053 syscall_table[SYS_lstat] = "lstat";
1054#endif
1055#if defined (SYS_symlink)
1056 syscall_table[SYS_symlink] = "symlink";
1057#endif
1058#if defined (SYS_readlink)
1059 syscall_table[SYS_readlink] = "readlink";
1060#endif
1061#if defined (SYS_setgroups)
1062 syscall_table[SYS_setgroups] = "setgroups";
1063#endif
1064#if defined (SYS_getgroups)
1065 syscall_table[SYS_getgroups] = "getgroups";
1066#endif
1067#if defined (SYS_fchmod)
1068 syscall_table[SYS_fchmod] = "fchmod";
1069#endif
1070#if defined (SYS_fchown)
1071 syscall_table[SYS_fchown] = "fchown";
1072#endif
1073#if defined (SYS_sigprocmask)
1074 syscall_table[SYS_sigprocmask] = "sigprocmask";
1075#endif
1076#if defined (SYS_sigsuspend)
1077 syscall_table[SYS_sigsuspend] = "sigsuspend";
1078#endif
1079#if defined (SYS_sigaltstack)
1080 syscall_table[SYS_sigaltstack] = "sigaltstack";
1081#endif
1082#if defined (SYS_sigaction)
1083 syscall_table[SYS_sigaction] = "sigaction";
1084#endif
1085#if defined (SYS_sigpending)
1086 syscall_table[SYS_sigpending] = "sigpending";
1087#endif
1088#if defined (SYS_context)
1089 syscall_table[SYS_context] = "context";
1090#endif
1091#if defined (SYS_evsys)
1092 syscall_table[SYS_evsys] = "evsys";
1093#endif
1094#if defined (SYS_evtrapret)
1095 syscall_table[SYS_evtrapret] = "evtrapret";
1096#endif
1097#if defined (SYS_statvfs)
1098 syscall_table[SYS_statvfs] = "statvfs";
1099#endif
1100#if defined (SYS_fstatvfs)
1101 syscall_table[SYS_fstatvfs] = "fstatvfs";
1102#endif
1103#if defined (SYS_nfssys)
1104 syscall_table[SYS_nfssys] = "nfssys";
1105#endif
1106#if defined (SYS_waitsys)
1107 syscall_table[SYS_waitsys] = "waitsys";
1108#endif
1109#if defined (SYS_sigsendsys)
1110 syscall_table[SYS_sigsendsys] = "sigsendsys";
1111#endif
1112#if defined (SYS_hrtsys)
1113 syscall_table[SYS_hrtsys] = "hrtsys";
1114#endif
1115#if defined (SYS_acancel)
1116 syscall_table[SYS_acancel] = "acancel";
1117#endif
1118#if defined (SYS_async)
1119 syscall_table[SYS_async] = "async";
1120#endif
1121#if defined (SYS_priocntlsys)
1122 syscall_table[SYS_priocntlsys] = "priocntlsys";
1123#endif
1124#if defined (SYS_pathconf)
1125 syscall_table[SYS_pathconf] = "pathconf";
1126#endif
1127#if defined (SYS_mincore)
1128 syscall_table[SYS_mincore] = "mincore";
1129#endif
1130#if defined (SYS_mmap)
1131 syscall_table[SYS_mmap] = "mmap";
1132#endif
1133#if defined (SYS_mprotect)
1134 syscall_table[SYS_mprotect] = "mprotect";
1135#endif
1136#if defined (SYS_munmap)
1137 syscall_table[SYS_munmap] = "munmap";
1138#endif
1139#if defined (SYS_fpathconf)
1140 syscall_table[SYS_fpathconf] = "fpathconf";
1141#endif
1142#if defined (SYS_vfork)
1143 syscall_table[SYS_vfork] = "vfork";
1144#endif
1145#if defined (SYS_fchdir)
1146 syscall_table[SYS_fchdir] = "fchdir";
1147#endif
1148#if defined (SYS_readv)
1149 syscall_table[SYS_readv] = "readv";
1150#endif
1151#if defined (SYS_writev)
1152 syscall_table[SYS_writev] = "writev";
1153#endif
1154#if defined (SYS_xstat)
1155 syscall_table[SYS_xstat] = "xstat";
1156#endif
1157#if defined (SYS_lxstat)
1158 syscall_table[SYS_lxstat] = "lxstat";
1159#endif
1160#if defined (SYS_fxstat)
1161 syscall_table[SYS_fxstat] = "fxstat";
1162#endif
1163#if defined (SYS_xmknod)
1164 syscall_table[SYS_xmknod] = "xmknod";
1165#endif
1166#if defined (SYS_clocal)
1167 syscall_table[SYS_clocal] = "clocal";
1168#endif
1169#if defined (SYS_setrlimit)
1170 syscall_table[SYS_setrlimit] = "setrlimit";
1171#endif
1172#if defined (SYS_getrlimit)
1173 syscall_table[SYS_getrlimit] = "getrlimit";
1174#endif
1175#if defined (SYS_lchown)
1176 syscall_table[SYS_lchown] = "lchown";
1177#endif
1178#if defined (SYS_memcntl)
1179 syscall_table[SYS_memcntl] = "memcntl";
1180#endif
1181#if defined (SYS_getpmsg)
1182 syscall_table[SYS_getpmsg] = "getpmsg";
1183#endif
1184#if defined (SYS_putpmsg)
1185 syscall_table[SYS_putpmsg] = "putpmsg";
1186#endif
1187#if defined (SYS_rename)
1188 syscall_table[SYS_rename] = "rename";
1189#endif
1190#if defined (SYS_uname)
1191 syscall_table[SYS_uname] = "uname";
1192#endif
1193#if defined (SYS_setegid)
1194 syscall_table[SYS_setegid] = "setegid";
1195#endif
1196#if defined (SYS_sysconfig)
1197 syscall_table[SYS_sysconfig] = "sysconfig";
1198#endif
1199#if defined (SYS_adjtime)
1200 syscall_table[SYS_adjtime] = "adjtime";
1201#endif
1202#if defined (SYS_systeminfo)
1203 syscall_table[SYS_systeminfo] = "systeminfo";
1204#endif
1205#if defined (SYS_seteuid)
1206 syscall_table[SYS_seteuid] = "seteuid";
1207#endif
de43d7d0
SG		 1208#if defined (SYS_sproc)
1209 syscall_table[SYS_sproc] = "sproc";
1210#endif
cc221e76 1211}
35f5886e
FF		 1212
1213/*
1214
3fbdd536 1215LOCAL FUNCTION
35f5886e 1216
3fbdd536 1217 procfs_kill_inferior - kill any currently inferior
35f5886e
FF		 1218
1219SYNOPSIS
1220
3fbdd536 1221 void procfs_kill_inferior (void)
35f5886e
FF		 1222
1223DESCRIPTION
1224
1225 Kill any current inferior.
1226
1227NOTES
1228
1229 Kills even attached inferiors. Presumably the user has already
1230 been prompted that the inferior is an attached one rather than
1231 one started by gdb. (FIXME?)
1232
1233*/
1234
3fbdd536
JG		 1235static void
1236procfs_kill_inferior ()
35f5886e 1237{
de43d7d0 1238 target_mourn_inferior ();
35f5886e
FF		 1239}
1240
1241/*
1242
1243LOCAL FUNCTION
1244
1245 unconditionally_kill_inferior - terminate the inferior
1246
1247SYNOPSIS
1248
de43d7d0 1249 static void unconditionally_kill_inferior (struct procinfo *)
35f5886e
FF		 1250
1251DESCRIPTION
1252
de43d7d0 1253 Kill the specified inferior.
35f5886e
FF		 1254
1255NOTE
1256
1257 A possibly useful enhancement would be to first try sending
1258 the inferior a terminate signal, politely asking it to commit
de43d7d0
SG		 1259 suicide, before we murder it (we could call that
1260 politely_kill_inferior()).
35f5886e
FF		 1261
1262*/
1263
1264static void
de43d7d0
SG		 1265unconditionally_kill_inferior (pi)
1266 struct procinfo *pi;
35f5886e
FF		 1267{
1268 int signo;
de43d7d0 1269 int ppid;
35f5886e 1270
de43d7d0
SG		 1271 ppid = pi->prstatus.pr_ppid;
1272
35f5886e 1273 signo = SIGKILL;
de43d7d0
SG		 1274 ioctl (pi->fd, PIOCKILL, &signo);
1275 close_proc_file (pi);
1276
1277/* Only wait() for our direct children. Our grandchildren zombies are killed
1278 by the death of their parents. */
1279
1280 if (ppid == getpid())
1281 wait ((int *) 0);
35f5886e
FF		 1282}
1283
1284/*
1285
3fbdd536 1286LOCAL FUNCTION
35f5886e 1287
3fbdd536 1288 procfs_xfer_memory -- copy data to or from inferior memory space
35f5886e
FF		 1289
1290SYNOPSIS
1291
3fbdd536 1292 int procfs_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len,
35f5886e
FF		 1293 int dowrite, struct target_ops target)
1294
1295DESCRIPTION
1296
1297 Copy LEN bytes to/from inferior's memory starting at MEMADDR
1298 from/to debugger memory starting at MYADDR. Copy from inferior
1299 if DOWRITE is zero or to inferior if DOWRITE is nonzero.
1300
1301 Returns the length copied, which is either the LEN argument or
3fbdd536 1302 zero. This xfer function does not do partial moves, since procfs_ops
35f5886e
FF		 1303 doesn't allow memory operations to cross below us in the target stack
1304 anyway.
1305
1306NOTES
1307
1308 The /proc interface makes this an almost trivial task.
1309 */
1310
3fbdd536
JG		 1311static int
1312procfs_xfer_memory (memaddr, myaddr, len, dowrite, target)
1ab3bf1b
JG		 1313 CORE_ADDR memaddr;
1314 char *myaddr;
1315 int len;
1316 int dowrite;
1317 struct target_ops *target; /* ignored */
35f5886e
FF		 1318{
1319 int nbytes = 0;
de43d7d0 1320 struct procinfo *pi;
35f5886e 1321
de43d7d0
SG		 1322 pi = current_procinfo;
1323
1324 if (lseek(pi->fd, (off_t) memaddr, 0) == (off_t) memaddr)
35f5886e
FF		 1325 {
1326 if (dowrite)
1327 {
de43d7d0 1328 nbytes = write (pi->fd, myaddr, len);
35f5886e
FF		 1329 }
1330 else
1331 {
de43d7d0 1332 nbytes = read (pi->fd, myaddr, len);
35f5886e
FF		 1333 }
1334 if (nbytes < 0)
1335 {
1336 nbytes = 0;
1337 }
1338 }
1339 return (nbytes);
1340}
1341
1342/*
1343
3fbdd536 1344LOCAL FUNCTION
35f5886e 1345
3fbdd536 1346 procfs_store_registers -- copy register values back to inferior
35f5886e
FF		 1347
1348SYNOPSIS
1349
3fbdd536 1350 void procfs_store_registers (int regno)
35f5886e
FF		 1351
1352DESCRIPTION
1353
1354 Store our current register values back into the inferior. If
1355 REGNO is -1 then store all the register, otherwise store just
1356 the value specified by REGNO.
1357
1358NOTES
1359
1360 If we are storing only a single register, we first have to get all
1361 the current values from the process, overwrite the desired register
1362 in the gregset with the one we want from gdb's registers, and then
1363 send the whole set back to the process. For writing all the
1364 registers, all we have to do is generate the gregset and send it to
1365 the process.
1366
1367 Also note that the process has to be stopped on an event of interest
1368 for this to work, which basically means that it has to have been
1369 run under the control of one of the other /proc ioctl calls and not
1370 ptrace. Since we don't use ptrace anyway, we don't worry about this
1371 fine point, but it is worth noting for future reference.
1372
1373 Gdb is confused about what this function is supposed to return.
1374 Some versions return a value, others return nothing. Some are
1375 declared to return a value and actually return nothing. Gdb ignores
1376 anything returned. (FIXME)
1377
1378 */
1379
3fbdd536
JG		 1380static void
1381procfs_store_registers (regno)
1ab3bf1b 1382 int regno;
35f5886e 1383{
de43d7d0
SG		 1384 struct procinfo *pi;
1385
1386 pi = current_procinfo;
1387
35f5886e
FF		 1388 if (regno != -1)
1389 {
de43d7d0 1390 ioctl (pi->fd, PIOCGREG, &pi->gregset);
35f5886e 1391 }
de43d7d0
SG		 1392 fill_gregset (&pi->gregset, regno);
1393 ioctl (pi->fd, PIOCSREG, &pi->gregset);
35f5886e
FF		 1394
1395#if defined (FP0_REGNUM)
1396
1397 /* Now repeat everything using the floating point register set, if the
1398 target has floating point hardware. Since we ignore the returned value,
1399 we'll never know whether it worked or not anyway. */
1400
1401 if (regno != -1)
1402 {
de43d7d0 1403 ioctl (pi->fd, PIOCGFPREG, &pi->fpregset);
35f5886e 1404 }
de43d7d0
SG		 1405 fill_fpregset (&pi->fpregset, regno);
1406 ioctl (pi->fd, PIOCSFPREG, &pi->fpregset);
35f5886e
FF		 1407
1408#endif /* FP0_REGNUM */
1409
1410}
1411
1412/*
1413
3fbdd536 1414LOCAL FUNCTION
35f5886e 1415
de43d7d0
SG		 1416 create_procinfo - initialize access to a /proc entry
1417
1418SYNOPSIS
1419
1420 void create_procinfo (int pid)
1421
1422DESCRIPTION
1423
1424 Allocate a procinfo structure, open the /proc file and then sets up
1425 the set of signals and faults that are to be traced.
1426
1427NOTES
1428
1429 If proc_init_failed ever gets called, control returns to the command
1430 processing loop via the standard error handling code.
1431
1432 */
1433
1434static void
1435create_procinfo (pid)
1436 int pid;
1437{
1438 struct procinfo *pi;
1439
1440 if (find_procinfo (pid, 1))
1441 return; /* All done! It already exists */
1442
1443 pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
1444
1445 if (!open_proc_file (pid, pi, O_RDWR))
1446 proc_init_failed (pi, "can't open process file");
1447
1448 /* Add new process to process info list */
1449
1450 pi->next = procinfo_list;
1451 procinfo_list = pi;
1452
1453 add_fd (pi); /* Add to list for poll/select */
1454
1455 memset ((char *) &pi->prrun, 0, sizeof (pi->prrun));
1456 prfillset (&pi->prrun.pr_trace);
1457 procfs_notice_signals (pid);
1458 prfillset (&pi->prrun.pr_fault);
1459 prdelset (&pi->prrun.pr_fault, FLTPAGE);
1460
1461 if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
1462 proc_init_failed (pi, "PIOCWSTOP failed");
1463
1464 if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault) < 0)
1465 proc_init_failed (pi, "PIOCSFAULT failed");
1466}
1467
1468/*
1469
1470LOCAL FUNCTION
1471
1472 procfs_init_inferior - initialize target vector and access to a
1473 /proc entry
35f5886e
FF		 1474
1475SYNOPSIS
1476
3fbdd536 1477 void procfs_init_inferior (int pid)
35f5886e
FF		 1478
1479DESCRIPTION
1480
1481 When gdb starts an inferior, this function is called in the parent
1482 process immediately after the fork. It waits for the child to stop
1483 on the return from the exec system call (the child itself takes care
1484 of ensuring that this is set up), then sets up the set of signals
1485 and faults that are to be traced.
1486
1487NOTES
1488
1489 If proc_init_failed ever gets called, control returns to the command
1490 processing loop via the standard error handling code.
cc221e76 1491
35f5886e
FF		 1492 */
1493
3fbdd536
JG		 1494static void
1495procfs_init_inferior (pid)
1ab3bf1b 1496 int pid;
35f5886e 1497{
3fbdd536
JG		 1498 push_target (&procfs_ops);
1499
de43d7d0
SG		 1500 create_procinfo (pid);
1501 add_thread (pid); /* Setup initial thread */
bc28a06c
JK		 1502
1503 /* One trap to exec the shell, one to exec the program being debugged. */
1504 startup_inferior (2);
35f5886e
FF		 1505}
1506
1507/*
1508
cc221e76
FF		 1509GLOBAL FUNCTION
1510
3950a34e 1511 procfs_notice_signals
cc221e76
FF		 1512
1513SYNOPSIS
1514
952a820e 1515 static void procfs_notice_signals (int pid);
cc221e76
FF		 1516
1517DESCRIPTION
1518
1519 When the user changes the state of gdb's signal handling via the
1520 "handle" command, this function gets called to see if any change
1521 in the /proc interface is required. It is also called internally
1522 by other /proc interface functions to initialize the state of
1523 the traced signal set.
1524
1525 One thing it does is that signals for which the state is "nostop",
1526 "noprint", and "pass", have their trace bits reset in the pr_trace
1527 field, so that they are no longer traced. This allows them to be
1528 delivered directly to the inferior without the debugger ever being
1529 involved.
1530 */
1531
3950a34e 1532static void
de43d7d0 1533procfs_notice_signals (pid)
952a820e 1534 int pid;
cc221e76
FF		 1535{
1536 int signo;
de43d7d0 1537 struct procinfo *pi;
cc221e76 1538
de43d7d0
SG		 1539 pi = find_procinfo (pid, 0);
1540
1541 for (signo = 0; signo < NSIG; signo++)
cc221e76 1542 {
67ac9759
JK		 1543 if (signal_stop_state (target_signal_from_host (signo)) == 0 &&
1544 signal_print_state (target_signal_from_host (signo)) == 0 &&
1545 signal_pass_state (target_signal_from_host (signo)) == 1)
cc221e76 1546 {
de43d7d0 1547 prdelset (&pi->prrun.pr_trace, signo);
cc221e76 1548 }
de43d7d0 1549 else
cc221e76 1550 {
de43d7d0 1551 praddset (&pi->prrun.pr_trace, signo);
cc221e76
FF		 1552 }
1553 }
de43d7d0
SG		 1554 if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
1555 {
1556 print_sys_errmsg ("PIOCSTRACE failed", errno);
1557 }
cc221e76
FF		 1558}
1559
1560/*
1561
3fbdd536 1562LOCAL FUNCTION
35f5886e
FF		 1563
1564 proc_set_exec_trap -- arrange for exec'd child to halt at startup
1565
1566SYNOPSIS
1567
1568 void proc_set_exec_trap (void)
1569
1570DESCRIPTION
1571
1572 This function is called in the child process when starting up
1573 an inferior, prior to doing the exec of the actual inferior.
1574 It sets the child process's exitset to make exit from the exec
1575 system call an event of interest to stop on, and then simply
1576 returns. The child does the exec, the system call returns, and
1577 the child stops at the first instruction, ready for the gdb
1578 parent process to take control of it.
1579
1580NOTE
1581
1582 We need to use all local variables since the child may be sharing
1583 it's data space with the parent, if vfork was used rather than
1584 fork.
cc221e76
FF		 1585
1586 Also note that we want to turn off the inherit-on-fork flag in
1587 the child process so that any grand-children start with all
1588 tracing flags cleared.
35f5886e
FF		 1589 */
1590
3fbdd536 1591static void
1ab3bf1b 1592proc_set_exec_trap ()
35f5886e
FF		 1593{
1594 sysset_t exitset;
fb63d460 1595 sysset_t entryset;
35f5886e
FF		 1596 auto char procname[32];
1597 int fd;
1598
4ed3a9ea 1599 sprintf (procname, PROC_NAME_FMT, getpid ());
35f5886e
FF		 1600 if ((fd = open (procname, O_RDWR)) < 0)
1601 {
1602 perror (procname);
199b2450 1603 gdb_flush (gdb_stderr);
35f5886e
FF		 1604 _exit (127);
1605 }
1606 premptyset (&exitset);
fb63d460 1607 premptyset (&entryset);
407a8389 1608
cc221e76
FF		 1609 /* GW: Rationale...
1610 Not all systems with /proc have all the exec* syscalls with the same
1611 names. On the SGI, for example, there is no SYS_exec, but there
1612 *is* a SYS_execv. So, we try to account for that. */
1613
407a8389 1614#ifdef SYS_exec
35f5886e 1615 praddset (&exitset, SYS_exec);
407a8389
SG		 1616#endif
1617#ifdef SYS_execve
35f5886e 1618 praddset (&exitset, SYS_execve);
407a8389
SG		 1619#endif
1620#ifdef SYS_execv
fb63d460 1621 praddset (&exitset, SYS_execv);
407a8389
SG		 1622#endif
1623
35f5886e
FF		 1624 if (ioctl (fd, PIOCSEXIT, &exitset) < 0)
1625 {
1626 perror (procname);
199b2450 1627 gdb_flush (gdb_stderr);
35f5886e
FF		 1628 _exit (127);
1629 }
cc221e76 1630
fb63d460
SG		 1631 praddset (&entryset, SYS_exit);
1632
1633 if (ioctl (fd, PIOCSENTRY, &entryset) < 0)
1634 {
1635 perror (procname);
199b2450 1636 gdb_flush (gdb_stderr);
fb63d460
SG		 1637 _exit (126);
1638 }
1639
cc221e76
FF		 1640 /* Turn off inherit-on-fork flag so that all grand-children of gdb
1641 start with tracing flags cleared. */
1642
5c1c5e67 1643#if defined (PIOCRESET) /* New method */
cc221e76
FF		 1644 {
1645 long pr_flags;
1646 pr_flags = PR_FORK;
4ed3a9ea 1647 ioctl (fd, PIOCRESET, &pr_flags);
cc221e76 1648 }
5c1c5e67
FF		 1649#else
1650#if defined (PIOCRFORK) /* Original method */
4ed3a9ea 1651 ioctl (fd, PIOCRFORK, NULL);
cc221e76 1652#endif
ec8ceca3
JG		 1653#endif
1654
1655 /* Turn on run-on-last-close flag so that this process will not hang
1656 if GDB goes away for some reason. */
1657
1658#if defined (PIOCSET) /* New method */
1659 {
1660 long pr_flags;
1661 pr_flags = PR_RLC;
1662 (void) ioctl (fd, PIOCSET, &pr_flags);
1663 }
1664#else
1665#if defined (PIOCSRLC) /* Original method */
1666 (void) ioctl (fd, PIOCSRLC, 0);
1667#endif
cc221e76 1668#endif
35f5886e
FF		 1669}
1670
f8b76e70
FF		 1671/*
1672
a39ad5ce
FF		 1673GLOBAL FUNCTION
1674
1675 proc_iterate_over_mappings -- call function for every mapped space
1676
1677SYNOPSIS
1678
1679 int proc_iterate_over_mappings (int (*func)())
1680
1681DESCRIPTION
1682
1683 Given a pointer to a function, call that function for every
1684 mapped address space, passing it an open file descriptor for
1685 the file corresponding to that mapped address space (if any)
1686 and the base address of the mapped space. Quit when we hit
1687 the end of the mappings or the function returns nonzero.
1688 */
1689
1690int
1ab3bf1b
JG		 1691proc_iterate_over_mappings (func)
1692 int (*func) PARAMS ((int, CORE_ADDR));
a39ad5ce
FF		 1693{
1694 int nmap;
1695 int fd;
1696 int funcstat = 0;
1697 struct prmap *prmaps;
1698 struct prmap *prmap;
de43d7d0
SG		 1699 struct procinfo *pi;
1700
1701 pi = current_procinfo;
a39ad5ce 1702
de43d7d0 1703 if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
a39ad5ce 1704 {
1ab3bf1b 1705 prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
de43d7d0 1706 if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
a39ad5ce
FF		 1707 {
1708 for (prmap = prmaps; prmap -> pr_size && funcstat == 0; ++prmap)
1709 {
de43d7d0 1710 fd = proc_address_to_fd (pi, (CORE_ADDR) prmap -> pr_vaddr, 0);
1ab3bf1b 1711 funcstat = (*func) (fd, (CORE_ADDR) prmap -> pr_vaddr);
a39ad5ce
FF		 1712 close (fd);
1713 }
1714 }
1715 }
1716 return (funcstat);
1717}
1718
3fbdd536 1719#if 0 /* Currently unused */
a39ad5ce
FF		 1720/*
1721
f8b76e70
FF		 1722GLOBAL FUNCTION
1723
1724 proc_base_address -- find base address for segment containing address
1725
1726SYNOPSIS
1727
1728 CORE_ADDR proc_base_address (CORE_ADDR addr)
1729
1730DESCRIPTION
1731
1732 Given an address of a location in the inferior, find and return
1733 the base address of the mapped segment containing that address.
1734
1735 This is used for example, by the shared library support code,
1736 where we have the pc value for some location in the shared library
1737 where we are stopped, and need to know the base address of the
1738 segment containing that address.
1739*/
1740
f8b76e70 1741CORE_ADDR
1ab3bf1b 1742proc_base_address (addr)
cc221e76 1743 CORE_ADDR addr;
f8b76e70
FF		 1744{
1745 int nmap;
1746 struct prmap *prmaps;
1747 struct prmap *prmap;
1748 CORE_ADDR baseaddr = 0;
de43d7d0 1749 struct procinfo *pi;
f8b76e70 1750
de43d7d0
SG		 1751 pi = current_procinfo;
1752
1753 if (ioctl (pi->fd, PIOCNMAP, &nmap) == 0)
f8b76e70 1754 {
1ab3bf1b 1755 prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
de43d7d0 1756 if (ioctl (pi->fd, PIOCMAP, prmaps) == 0)
f8b76e70
FF		 1757 {
1758 for (prmap = prmaps; prmap -> pr_size; ++prmap)
1759 {
1760 if ((prmap -> pr_vaddr <= (caddr_t) addr) &&
1761 (prmap -> pr_vaddr + prmap -> pr_size > (caddr_t) addr))
1762 {
1763 baseaddr = (CORE_ADDR) prmap -> pr_vaddr;
1764 break;
1765 }
1766 }
1767 }
1768 }
1769 return (baseaddr);
1770}
1771
1ab3bf1b
JG		 1772#endif /* 0 */
1773
f8b76e70
FF		 1774/*
1775
cc221e76 1776LOCAL FUNCTION
f8b76e70
FF		 1777
1778 proc_address_to_fd -- return open fd for file mapped to address
1779
1780SYNOPSIS
1781
de43d7d0 1782 int proc_address_to_fd (struct procinfo *pi, CORE_ADDR addr, complain)
f8b76e70
FF		 1783
1784DESCRIPTION
1785
1786 Given an address in the current inferior's address space, use the
1787 /proc interface to find an open file descriptor for the file that
1788 this address was mapped in from. Return -1 if there is no current
1789 inferior. Print a warning message if there is an inferior but
1790 the address corresponds to no file (IE a bogus address).
1791
1792*/
1793
1ab3bf1b 1794static int
de43d7d0
SG		 1795proc_address_to_fd (pi, addr, complain)
1796 struct procinfo *pi;
1ab3bf1b
JG		 1797 CORE_ADDR addr;
1798 int complain;
f8b76e70
FF		 1799{
1800 int fd = -1;
1801
de43d7d0 1802 if ((fd = ioctl (pi->fd, PIOCOPENM, (caddr_t *) &addr)) < 0)
f8b76e70 1803 {
de43d7d0 1804 if (complain)
f8b76e70 1805 {
de43d7d0
SG		 1806 print_sys_errmsg (pi->pathname, errno);
1807 warning ("can't find mapped file for address 0x%x", addr);
f8b76e70
FF		 1808 }
1809 }
1810 return (fd);
1811}
1812
35f5886e 1813
3fbdd536
JG		 1814/* Attach to process PID, then initialize for debugging it
1815 and wait for the trace-trap that results from attaching. */
1816
1817static void
1818procfs_attach (args, from_tty)
1819 char *args;
1820 int from_tty;
1821{
1822 char *exec_file;
1823 int pid;
1824
1825 if (!args)
1826 error_no_arg ("process-id to attach");
1827
1828 pid = atoi (args);
1829
1830 if (pid == getpid()) /* Trying to masturbate? */
1831 error ("I refuse to debug myself!");
1832
1833 if (from_tty)
1834 {
1835 exec_file = (char *) get_exec_file (0);
1836
1837 if (exec_file)
199b2450 1838 printf_unfiltered ("Attaching to program `%s', %s\n", exec_file, target_pid_to_str (pid));
3fbdd536 1839 else
199b2450 1840 printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
3fbdd536 1841
199b2450 1842 gdb_flush (gdb_stdout);
3fbdd536
JG		 1843 }
1844
1845 do_attach (pid);
1846 inferior_pid = pid;
1847 push_target (&procfs_ops);
1848}
1849
1850
1851/* Take a program previously attached to and detaches it.
1852 The program resumes execution and will no longer stop
1853 on signals, etc. We'd better not have left any breakpoints
1854 in the program or it'll die when it hits one. For this
1855 to work, it may be necessary for the process to have been
1856 previously attached. It *might* work if the program was
1857 started via the normal ptrace (PTRACE_TRACEME). */
1858
1859static void
1860procfs_detach (args, from_tty)
1861 char *args;
1862 int from_tty;
1863{
1864 int siggnal = 0;
1865
1866 if (from_tty)
1867 {
1868 char *exec_file = get_exec_file (0);
1869 if (exec_file == 0)
1870 exec_file = "";
199b2450 1871 printf_unfiltered ("Detaching from program: %s %s\n",
25286543 1872 exec_file, target_pid_to_str (inferior_pid));
199b2450 1873 gdb_flush (gdb_stdout);
3fbdd536
JG		 1874 }
1875 if (args)
1876 siggnal = atoi (args);
1877
1878 do_detach (siggnal);
1879 inferior_pid = 0;
1880 unpush_target (&procfs_ops); /* Pop out of handling an inferior */
1881}
1882
1883/* Get ready to modify the registers array. On machines which store
1884 individual registers, this doesn't need to do anything. On machines
1885 which store all the registers in one fell swoop, this makes sure
1886 that registers contains all the registers from the program being
1887 debugged. */
1888
1889static void
1890procfs_prepare_to_store ()
1891{
1892#ifdef CHILD_PREPARE_TO_STORE
1893 CHILD_PREPARE_TO_STORE ();
1894#endif
1895}
1896
1897/* Print status information about what we're accessing. */
1898
1899static void
1900procfs_files_info (ignore)
1901 struct target_ops *ignore;
1902{
199b2450 1903 printf_unfiltered ("\tUsing the running image of %s %s via /proc.\n",
25286543 1904 attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
3fbdd536
JG		 1905}
1906
1907/* ARGSUSED */
1908static void
1909procfs_open (arg, from_tty)
1910 char *arg;
1911 int from_tty;
1912{
1913 error ("Use the \"run\" command to start a Unix child process.");
1914}
35f5886e
FF		 1915
1916/*
1917
3fbdd536 1918LOCAL FUNCTION
35f5886e 1919
3fbdd536 1920 do_attach -- attach to an already existing process
35f5886e
FF		 1921
1922SYNOPSIS
1923
3fbdd536 1924 int do_attach (int pid)
35f5886e
FF		 1925
1926DESCRIPTION
1927
1928 Attach to an already existing process with the specified process
1929 id. If the process is not already stopped, query whether to
1930 stop it or not.
1931
1932NOTES
1933
1934 The option of stopping at attach time is specific to the /proc
1935 versions of gdb. Versions using ptrace force the attachee
ec8ceca3
JG		 1936 to stop. (I have changed this version to do so, too. All you
1937 have to do is "continue" to make it go on. -- gnu@cygnus.com)
35f5886e
FF		 1938
1939*/
1940
3fbdd536
JG		 1941static int
1942do_attach (pid)
1ab3bf1b 1943 int pid;
35f5886e 1944{
ec8ceca3 1945 int result;
de43d7d0
SG		 1946 struct procinfo *pi;
1947
1948 pi = (struct procinfo *) xmalloc (sizeof (struct procinfo));
ec8ceca3 1949
de43d7d0 1950 if (!open_proc_file (pid, pi, O_RDWR))
35f5886e 1951 {
de43d7d0
SG		 1952 free (pi);
1953 perror_with_name (pi->pathname);
35f5886e
FF		 1954 /* NOTREACHED */
1955 }
1956
de43d7d0
SG		 1957 /* Add new process to process info list */
1958
1959 pi->next = procinfo_list;
1960 procinfo_list = pi;
1961
1962 add_fd (pi); /* Add to list for poll/select */
1963
35f5886e
FF		 1964 /* Get current status of process and if it is not already stopped,
1965 then stop it. Remember whether or not it was stopped when we first
1966 examined it. */
1967
de43d7d0 1968 if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
35f5886e 1969 {
de43d7d0
SG		 1970 print_sys_errmsg (pi->pathname, errno);
1971 close_proc_file (pi);
35f5886e
FF		 1972 error ("PIOCSTATUS failed");
1973 }
de43d7d0 1974 if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
35f5886e 1975 {
de43d7d0 1976 pi->was_stopped = 1;
35f5886e
FF		 1977 }
1978 else
1979 {
de43d7d0 1980 pi->was_stopped = 0;
ec8ceca3 1981 if (1 || query ("Process is currently running, stop it? "))
35f5886e 1982 {
ec8ceca3
JG		 1983 /* Make it run again when we close it. */
1984#if defined (PIOCSET) /* New method */
1985 {
1986 long pr_flags;
1987 pr_flags = PR_RLC;
de43d7d0 1988 result = ioctl (pi->fd, PIOCSET, &pr_flags);
ec8ceca3
JG		 1989 }
1990#else
1991#if defined (PIOCSRLC) /* Original method */
de43d7d0 1992 result = ioctl (pi->fd, PIOCSRLC, 0);
ec8ceca3
JG		 1993#endif
1994#endif
1995 if (result < 0)
1996 {
de43d7d0
SG		 1997 print_sys_errmsg (pi->pathname, errno);
1998 close_proc_file (pi);
ec8ceca3
JG		 1999 error ("PIOCSRLC or PIOCSET failed");
2000 }
de43d7d0 2001 if (ioctl (pi->fd, PIOCSTOP, &pi->prstatus) < 0)
35f5886e 2002 {
de43d7d0
SG		 2003 print_sys_errmsg (pi->pathname, errno);
2004 close_proc_file (pi);
35f5886e
FF		 2005 error ("PIOCSTOP failed");
2006 }
de43d7d0 2007 pi->nopass_next_sigstop = 1;
d65eee73
FF		 2008 }
2009 else
2010 {
199b2450 2011 printf_unfiltered ("Ok, gdb will wait for %s to stop.\n", target_pid_to_str (pid));
35f5886e
FF		 2012 }
2013 }
ec8ceca3 2014
35f5886e
FF		 2015 /* Remember some things about the inferior that we will, or might, change
2016 so that we can restore them when we detach. */
2017
de43d7d0
SG		 2018 ioctl (pi->fd, PIOCGTRACE, &pi->saved_trace);
2019 ioctl (pi->fd, PIOCGHOLD, &pi->saved_sighold);
2020 ioctl (pi->fd, PIOCGFAULT, &pi->saved_fltset);
2021 ioctl (pi->fd, PIOCGENTRY, &pi->saved_entryset);
2022 ioctl (pi->fd, PIOCGEXIT, &pi->saved_exitset);
35f5886e
FF		 2023
2024 /* Set up trace and fault sets, as gdb expects them. */
2025
de43d7d0
SG		 2026 memset (&pi->prrun, 0, sizeof (pi->prrun));
2027 prfillset (&pi->prrun.pr_trace);
2028 procfs_notice_signals (pid);
2029 prfillset (&pi->prrun.pr_fault);
2030 prdelset (&pi->prrun.pr_fault, FLTPAGE);
2031 if (ioctl (pi->fd, PIOCSFAULT, &pi->prrun.pr_fault))
35f5886e 2032 {
f66f459f 2033 print_sys_errmsg ("PIOCSFAULT failed", errno);
35f5886e 2034 }
de43d7d0 2035 if (ioctl (pi->fd, PIOCSTRACE, &pi->prrun.pr_trace))
35f5886e 2036 {
f66f459f 2037 print_sys_errmsg ("PIOCSTRACE failed", errno);
35f5886e
FF		 2038 }
2039 attach_flag = 1;
2040 return (pid);
2041}
2042
2043/*
2044
3fbdd536 2045LOCAL FUNCTION
35f5886e 2046
3fbdd536 2047 do_detach -- detach from an attached-to process
35f5886e
FF		 2048
2049SYNOPSIS
2050
3fbdd536 2051 void do_detach (int signal)
35f5886e
FF		 2052
2053DESCRIPTION
2054
2055 Detach from the current attachee.
2056
2057 If signal is non-zero, the attachee is started running again and sent
2058 the specified signal.
2059
2060 If signal is zero and the attachee was not already stopped when we
2061 attached to it, then we make it runnable again when we detach.
2062
2063 Otherwise, we query whether or not to make the attachee runnable
2064 again, since we may simply want to leave it in the state it was in
2065 when we attached.
2066
2067 We report any problems, but do not consider them errors, since we
2068 MUST detach even if some things don't seem to go right. This may not
2069 be the ideal situation. (FIXME).
2070 */
2071
3fbdd536
JG		 2072static void
2073do_detach (signal)
1ab3bf1b 2074 int signal;
35f5886e 2075{
ec8ceca3 2076 int result;
de43d7d0
SG		 2077 struct procinfo *pi;
2078
2079 pi = current_procinfo;
ec8ceca3 2080
35f5886e
FF		 2081 if (signal)
2082 {
de43d7d0 2083 set_proc_siginfo (pi, signal);
35f5886e 2084 }
de43d7d0 2085 if (ioctl (pi->fd, PIOCSEXIT, &pi->saved_exitset) < 0)
35f5886e 2086 {
de43d7d0 2087 print_sys_errmsg (pi->pathname, errno);
199b2450 2088 printf_unfiltered ("PIOCSEXIT failed.\n");
35f5886e 2089 }
de43d7d0 2090 if (ioctl (pi->fd, PIOCSENTRY, &pi->saved_entryset) < 0)
35f5886e 2091 {
de43d7d0 2092 print_sys_errmsg (pi->pathname, errno);
199b2450 2093 printf_unfiltered ("PIOCSENTRY failed.\n");
35f5886e 2094 }
de43d7d0 2095 if (ioctl (pi->fd, PIOCSTRACE, &pi->saved_trace) < 0)
35f5886e 2096 {
de43d7d0 2097 print_sys_errmsg (pi->pathname, errno);
199b2450 2098 printf_unfiltered ("PIOCSTRACE failed.\n");
35f5886e 2099 }
de43d7d0 2100 if (ioctl (pi->fd, PIOCSHOLD, &pi->saved_sighold) < 0)
cc221e76 2101 {
de43d7d0 2102 print_sys_errmsg (pi->pathname, errno);
199b2450 2103 printf_unfiltered ("PIOSCHOLD failed.\n");
cc221e76 2104 }
de43d7d0 2105 if (ioctl (pi->fd, PIOCSFAULT, &pi->saved_fltset) < 0)
35f5886e 2106 {
de43d7d0 2107 print_sys_errmsg (pi->pathname, errno);
199b2450 2108 printf_unfiltered ("PIOCSFAULT failed.\n");
35f5886e 2109 }
de43d7d0 2110 if (ioctl (pi->fd, PIOCSTATUS, &pi->prstatus) < 0)
35f5886e 2111 {
de43d7d0 2112 print_sys_errmsg (pi->pathname, errno);
199b2450 2113 printf_unfiltered ("PIOCSTATUS failed.\n");
35f5886e
FF		 2114 }
2115 else
2116 {
de43d7d0 2117 if (signal || (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
35f5886e 2118 {
de43d7d0 2119 if (signal || !pi->was_stopped ||
35f5886e
FF		 2120 query ("Was stopped when attached, make it runnable again? "))
2121 {
ec8ceca3 2122 /* Clear any fault that might have stopped it. */
de43d7d0 2123 if (ioctl (pi->fd, PIOCCFAULT, 0))
ec8ceca3 2124 {
de43d7d0 2125 print_sys_errmsg (pi->pathname, errno);
199b2450 2126 printf_unfiltered ("PIOCCFAULT failed.\n");
ec8ceca3
JG		 2127 }
2128
2129 /* Make it run again when we close it. */
2130#if defined (PIOCSET) /* New method */
2131 {
2132 long pr_flags;
2133 pr_flags = PR_RLC;
de43d7d0 2134 result = ioctl (pi->fd, PIOCSET, &pr_flags);
ec8ceca3
JG		 2135 }
2136#else
2137#if defined (PIOCSRLC) /* Original method */
de43d7d0 2138 result = ioctl (pi->fd, PIOCSRLC, 0);
ec8ceca3
JG		 2139#endif
2140#endif
2141 if (result)
35f5886e 2142 {
de43d7d0 2143 print_sys_errmsg (pi->pathname, errno);
199b2450 2144 printf_unfiltered ("PIOCSRLC or PIOCSET failed.\n");
35f5886e
FF		 2145 }
2146 }
2147 }
2148 }
de43d7d0 2149 close_proc_file (pi);
35f5886e
FF		 2150 attach_flag = 0;
2151}
2152
45dc9be3
JK		 2153/* emulate wait() as much as possible.
2154 Wait for child to do something. Return pid of child, or -1 in case
2155 of error; store status in *OURSTATUS.
2156
2157 Not sure why we can't
2158 just use wait(), but it seems to have problems when applied to a
2159 process being controlled with the /proc interface.
2160
2161 We have a race problem here with no obvious solution. We need to let
2162 the inferior run until it stops on an event of interest, which means
2163 that we need to use the PIOCWSTOP ioctl. However, we cannot use this
2164 ioctl if the process is already stopped on something that is not an
2165 event of interest, or the call will hang indefinitely. Thus we first
2166 use PIOCSTATUS to see if the process is not stopped. If not, then we
2167 use PIOCWSTOP. But during the window between the two, if the process
2168 stops for any reason that is not an event of interest (such as a job
2169 control signal) then gdb will hang. One possible workaround is to set
2170 an alarm to wake up every minute of so and check to see if the process
2171 is still running, and if so, then reissue the PIOCWSTOP. But this is
2172 a real kludge, so has not been implemented. FIXME: investigate
2173 alternatives.
2174
2175 FIXME: Investigate why wait() seems to have problems with programs
2176 being control by /proc routines. */
35f5886e 2177
3fbdd536 2178static int
45dc9be3 2179procfs_wait (pid, ourstatus)
de43d7d0 2180 int pid;
67ac9759 2181 struct target_waitstatus *ourstatus;
35f5886e
FF		 2182{
2183 short what;
2184 short why;
2185 int statval = 0;
2186 int checkerr = 0;
2187 int rtnval = -1;
de43d7d0
SG		 2188 struct procinfo *pi;
2189
2190 if (pid != -1) /* Non-specific process? */
2191 pi = NULL;
2192 else
2193 for (pi = procinfo_list; pi; pi = pi->next)
2194 if (pi->had_event)
2195 break;
2196
2197wait_again:
2198
2199 if (!pi)
7c5d526e 2200 pi = wait_fd ();
de43d7d0
SG		 2201
2202 if (pid != -1)
2203 for (pi = procinfo_list; pi; pi = pi->next)
2204 if (pi->pid == pid && pi->had_event)
2205 break;
2206
2207 if (!pi && !checkerr)
2208 goto wait_again;
2209
2210 if (!checkerr && !(pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP)))
2211 {
2212 if (ioctl (pi->fd, PIOCWSTOP, &pi->prstatus) < 0)
2213 {
2214 checkerr++;
2215 }
35f5886e
FF		 2216 }
2217 if (checkerr)
2218 {
2219 if (errno == ENOENT)
2220 {
2221 rtnval = wait (&statval);
2222 if (rtnval != inferior_pid)
2223 {
de43d7d0 2224 print_sys_errmsg (pi->pathname, errno);
35f5886e
FF		 2225 error ("PIOCWSTOP, wait failed, returned %d", rtnval);
2226 /* NOTREACHED */
2227 }
2228 }
2229 else
2230 {
de43d7d0 2231 print_sys_errmsg (pi->pathname, errno);
35f5886e
FF		 2232 error ("PIOCSTATUS or PIOCWSTOP failed.");
2233 /* NOTREACHED */
2234 }
2235 }
de43d7d0 2236 else if (pi->prstatus.pr_flags & (PR_STOPPED | PR_ISTOP))
35f5886e 2237 {
de43d7d0
SG		 2238 rtnval = pi->prstatus.pr_pid;
2239 why = pi->prstatus.pr_why;
2240 what = pi->prstatus.pr_what;
2241
2242 switch (why)
35f5886e 2243 {
de43d7d0 2244 case PR_SIGNALLED:
35f5886e 2245 statval = (what << 8) | 0177;
fb63d460
SG		 2246 break;
2247 case PR_SYSENTRY:
2248 if (what != SYS_exit)
2249 error ("PR_SYSENTRY, unknown system call %d", what);
2250
2251 pi->prrun.pr_flags = PRCFAULT;
2252
2253 if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
2254 perror_with_name (pi->pathname);
2255
2256 rtnval = wait (&statval);
2257
de43d7d0
SG		 2258 break;
2259 case PR_SYSEXIT:
2260 switch (what)
2261 {
407a8389 2262#ifdef SYS_exec
de43d7d0 2263 case SYS_exec:
407a8389
SG		 2264#endif
2265#ifdef SYS_execve
de43d7d0 2266 case SYS_execve:
407a8389
SG		 2267#endif
2268#ifdef SYS_execv
de43d7d0 2269 case SYS_execv:
407a8389 2270#endif
de43d7d0
SG		 2271 statval = (SIGTRAP << 8) | 0177;
2272 break;
2273#ifdef SYS_sproc
2274 case SYS_sproc:
2275/* We've just detected the completion of an sproc system call. Now we need to
2276 setup a procinfo struct for this thread, and notify the thread system of the
2277 new arrival. */
2278
2279/* If sproc failed, then nothing interesting happened. Continue the process and
2280 go back to sleep. */
2281
2282 if (pi->prstatus.pr_errno != 0)
2283 {
2284 pi->prrun.pr_flags &= PRSTEP;
2285 pi->prrun.pr_flags |= PRCFAULT;
2286
2287 if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
2288 perror_with_name (pi->pathname);
2289
2290 goto wait_again;
2291 }
2292
2293/* At this point, the new thread is stopped at it's first instruction, and
2294 the parent is stopped at the exit from sproc. */
2295
2296/* Notify the caller of the arrival of a new thread. */
2297 create_procinfo (pi->prstatus.pr_rval1);
2298
2299 rtnval = pi->prstatus.pr_rval1;
2300 statval = (SIGTRAP << 8) | 0177;
2301
2302 break;
2303#endif /* SYS_sproc */
2304
2305 default:
2306 error ("PIOCSTATUS (PR_SYSEXIT): Unknown system call %d", what);
2307 }
2308 break;
2309 case PR_REQUESTED:
35f5886e 2310 statval = (SIGSTOP << 8) | 0177;
de43d7d0
SG		 2311 break;
2312 case PR_JOBCONTROL:
35f5886e 2313 statval = (what << 8) | 0177;
de43d7d0
SG		 2314 break;
2315 case PR_FAULTED:
35f5886e
FF		 2316 switch (what)
2317 {
2318 case FLTPRIV:
2319 case FLTILL:
2320 statval = (SIGILL << 8) | 0177;
2321 break;
2322 case FLTBPT:
2323 case FLTTRACE:
2324 statval = (SIGTRAP << 8) | 0177;
2325 break;
2326 case FLTSTACK:
2327 case FLTACCESS:
2328 case FLTBOUNDS:
2329 statval = (SIGSEGV << 8) | 0177;
2330 break;
2331 case FLTIOVF:
2332 case FLTIZDIV:
2333 case FLTFPE:
2334 statval = (SIGFPE << 8) | 0177;
2335 break;
2336 case FLTPAGE: /* Recoverable page fault */
2337 default:
35f5886e 2338 error ("PIOCWSTOP, unknown why %d, what %d", why, what);
35f5886e 2339 }
de43d7d0
SG		 2340 break;
2341 default:
35f5886e 2342 error ("PIOCWSTOP, unknown why %d, what %d", why, what);
35f5886e 2343 }
de43d7d0
SG		 2344/* Stop all the other threads when any of them stops. */
2345
2346 {
2347 struct procinfo *procinfo;
2348
2349 for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
2350 {
2351 if (!procinfo->had_event)
2352 if (ioctl (procinfo->fd, PIOCSTOP, &procinfo->prstatus) < 0)
2353 {
2354 print_sys_errmsg (procinfo->pathname, errno);
2355 error ("PIOCSTOP failed");
2356 }
2357 }
2358 }
35f5886e
FF		 2359 }
2360 else
2361 {
2362 error ("PIOCWSTOP, stopped for unknown/unhandled reason, flags %#x",
de43d7d0 2363 pi->prstatus.pr_flags);
35f5886e 2364 }
3fbdd536 2365
67ac9759 2366 store_waitstatus (ourstatus, statval);
3fbdd536
JG		 2367
2368 if (rtnval == -1) /* No more children to wait for */
2369 {
199b2450 2370 fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing.\n");
67ac9759
JK		 2371 /* Claim it exited with unknown signal. */
2372 ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
2373 ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
3fbdd536
JG		 2374 return rtnval;
2375 }
2376
de43d7d0 2377 pi->had_event = 0; /* Indicate that we've seen this one */
35f5886e
FF		 2378 return (rtnval);
2379}
2380
2381/*
2382
6b801388
FF		 2383LOCAL FUNCTION
2384
2385 set_proc_siginfo - set a process's current signal info
2386
2387SYNOPSIS
2388
2389 void set_proc_siginfo (struct procinfo *pip, int signo);
2390
2391DESCRIPTION
2392
2393 Given a pointer to a process info struct in PIP and a signal number
2394 in SIGNO, set the process's current signal and its associated signal
2395 information. The signal will be delivered to the process immediately
2396 after execution is resumed, even if it is being held. In addition,
2397 this particular delivery will not cause another PR_SIGNALLED stop
2398 even if the signal is being traced.
2399
2400 If we are not delivering the same signal that the prstatus siginfo
2401 struct contains information about, then synthesize a siginfo struct
2402 to match the signal we are doing to deliver, make it of the type
2403 "generated by a user process", and send this synthesized copy. When
2404 used to set the inferior's signal state, this will be required if we
2405 are not currently stopped because of a traced signal, or if we decide
2406 to continue with a different signal.
2407
2408 Note that when continuing the inferior from a stop due to receipt
2409 of a traced signal, we either have set PRCSIG to clear the existing
2410 signal, or we have to call this function to do a PIOCSSIG with either
2411 the existing siginfo struct from pr_info, or one we have synthesized
2412 appropriately for the signal we want to deliver. Otherwise if the
2413 signal is still being traced, the inferior will immediately stop
2414 again.
2415
2416 See siginfo(5) for more details.
2417*/
2418
2419static void
2420set_proc_siginfo (pip, signo)
cc221e76
FF		 2421 struct procinfo *pip;
2422 int signo;
6b801388
FF		 2423{
2424 struct siginfo newsiginfo;
2425 struct siginfo *sip;
2426
de43d7d0 2427 if (signo == pip -> prstatus.pr_info.si_signo)
6b801388 2428 {
de43d7d0
SG		 2429 sip = &pip -> prstatus.pr_info;
2430 }
2431 else
2432 {
2433 memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));
2434 sip = &newsiginfo;
2435 sip -> si_signo = signo;
2436 sip -> si_code = 0;
2437 sip -> si_errno = 0;
2438 sip -> si_pid = getpid ();
2439 sip -> si_uid = getuid ();
2440 }
2441 if (ioctl (pip -> fd, PIOCSSIG, sip) < 0)
2442 {
2443 print_sys_errmsg (pip -> pathname, errno);
2444 warning ("PIOCSSIG failed");
6b801388
FF		 2445 }
2446}
2447
25286543 2448/* Resume execution of process PID. If STEP is nozero, then
59ba57da
JK		 2449 just single step it. If SIGNAL is nonzero, restart it with that
2450 signal activated. */
35f5886e 2451
3fbdd536 2452static void
25286543
SG		 2453procfs_resume (pid, step, signo)
2454 int pid;
1ab3bf1b 2455 int step;
67ac9759 2456 enum target_signal signo;
35f5886e 2457{
59ba57da 2458 int signal_to_pass;
de43d7d0
SG		 2459 struct procinfo *pi, *procinfo;
2460
2461 pi = find_procinfo (pid == -1 ? inferior_pid : pid, 0);
59ba57da 2462
35f5886e 2463 errno = 0;
de43d7d0 2464 pi->prrun.pr_flags = PRSTRACE | PRSFAULT | PRCFAULT;
99fd9e3e 2465
59ba57da
JK		 2466#if 0
2467 /* It should not be necessary. If the user explicitly changes the value,
2468 value_assign calls write_register_bytes, which writes it. */
2469/* It may not be absolutely necessary to specify the PC value for
2470 restarting, but to be safe we use the value that gdb considers
2471 to be current. One case where this might be necessary is if the
2472 user explicitly changes the PC value that gdb considers to be
2473 current. FIXME: Investigate if this is necessary or not. */
2474
c3192172 2475#ifdef PRSVADDR_BROKEN
99fd9e3e
SG		 2476/* Can't do this under Solaris running on a Sparc, as there seems to be no
2477 place to put nPC. In fact, if you use this, nPC seems to be set to some
2478 random garbage. We have to rely on the fact that PC and nPC have been
2479 written previously via PIOCSREG during a register flush. */
2480
de43d7d0
SG		 2481 pi->prrun.pr_vaddr = (caddr_t) *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
2482 pi->prrun.pr_flags != PRSVADDR;
99fd9e3e 2483#endif
59ba57da
JK		 2484#endif
2485
67ac9759 2486 if (signo == TARGET_SIGNAL_STOP && pi->nopass_next_sigstop)
59ba57da
JK		 2487 /* When attaching to a child process, if we forced it to stop with
2488 a PIOCSTOP, then we will have set the nopass_next_sigstop flag.
2489 Upon resuming the first time after such a stop, we explicitly
2490 inhibit sending it another SIGSTOP, which would be the normal
2491 result of default signal handling. One potential drawback to
2492 this is that we will also ignore any attempt to by the user
2493 to explicitly continue after the attach with a SIGSTOP. Ultimately
2494 this problem should be dealt with by making the routines that
2495 deal with the inferior a little smarter, and possibly even allow
2496 an inferior to continue running at the same time as gdb. (FIXME?) */
2497 signal_to_pass = 0;
67ac9759 2498 else if (signo == TARGET_SIGNAL_TSTP
de43d7d0
SG		 2499 && pi->prstatus.pr_cursig == SIGTSTP
2500 && pi->prstatus.pr_action.sa_handler == SIG_DFL)
59ba57da
JK		 2501
2502 /* We are about to pass the inferior a SIGTSTP whose action is
2503 SIG_DFL. The SIG_DFL action for a SIGTSTP is to stop
2504 (notifying the parent via wait()), and then keep going from the
2505 same place when the parent is ready for you to keep going. So
2506 under the debugger, it should do nothing (as if the program had
2507 been stopped and then later resumed. Under ptrace, this
2508 happens for us, but under /proc, the system obligingly stops
2509 the process, and wait_for_inferior would have no way of
2510 distinguishing that type of stop (which indicates that we
2511 should just start it again), with a stop due to the pr_trace
2512 field of the prrun_t struct.
2513
2514 Note that if the SIGTSTP is being caught, we *do* need to pass it,
2515 because the handler needs to get executed. */
2516 signal_to_pass = 0;
2517 else
67ac9759 2518 signal_to_pass = target_signal_to_host (signo);
99fd9e3e 2519
59ba57da 2520 if (signal_to_pass)
35f5886e 2521 {
de43d7d0 2522 set_proc_siginfo (pi, signal_to_pass);
35f5886e
FF		 2523 }
2524 else
2525 {
de43d7d0 2526 pi->prrun.pr_flags |= PRCSIG;
35f5886e 2527 }
de43d7d0 2528 pi->nopass_next_sigstop = 0;
35f5886e
FF		 2529 if (step)
2530 {
de43d7d0 2531 pi->prrun.pr_flags |= PRSTEP;
35f5886e 2532 }
de43d7d0 2533 if (ioctl (pi->fd, PIOCRUN, &pi->prrun) != 0)
35f5886e 2534 {
de43d7d0 2535 perror_with_name (pi->pathname);
35f5886e
FF		 2536 /* NOTREACHED */
2537 }
de43d7d0
SG		 2538
2539 pi->had_event = 0;
2540
2541 /* Continue all the other threads that haven't had an event of
2542 interest. */
2543
2544 if (pid == -1)
2545 for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
2546 {
2547 if (pi != procinfo && !procinfo->had_event)
2548 {
2549 procinfo->prrun.pr_flags &= PRSTEP;
2550 procinfo->prrun.pr_flags |= PRCFAULT | PRCSIG;
2551 ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
2552 if (ioctl (procinfo->fd, PIOCRUN, &procinfo->prrun) < 0)
2553 {
2554 if (ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus) < 0)
2555 {
199b2450 2556 fprintf_unfiltered(gdb_stderr, "PIOCSTATUS failed, errno=%d\n", errno);
de43d7d0
SG		 2557 }
2558 print_sys_errmsg (procinfo->pathname, errno);
2559 error ("PIOCRUN failed");
2560 }
2561 ioctl (procinfo->fd, PIOCSTATUS, &procinfo->prstatus);
2562 }
2563 }
35f5886e
FF		 2564}
2565
2566/*
2567
3fbdd536 2568LOCAL FUNCTION
35f5886e 2569
3fbdd536 2570 procfs_fetch_registers -- fetch current registers from inferior
35f5886e
FF		 2571
2572SYNOPSIS
2573
3fbdd536 2574 void procfs_fetch_registers (int regno)
35f5886e
FF		 2575
2576DESCRIPTION
2577
2578 Read the current values of the inferior's registers, both the
2579 general register set and floating point registers (if supported)
2580 and update gdb's idea of their current values.
2581
2582*/
2583
3fbdd536
JG		 2584static void
2585procfs_fetch_registers (regno)
1ab3bf1b 2586 int regno;
35f5886e 2587{
de43d7d0
SG		 2588 struct procinfo *pi;
2589
2590 pi = current_procinfo;
2591
2592 if (ioctl (pi->fd, PIOCGREG, &pi->gregset) != -1)
35f5886e 2593 {
de43d7d0 2594 supply_gregset (&pi->gregset);
35f5886e
FF		 2595 }
2596#if defined (FP0_REGNUM)
de43d7d0 2597 if (ioctl (pi->fd, PIOCGFPREG, &pi->fpregset) != -1)
35f5886e 2598 {
de43d7d0 2599 supply_fpregset (&pi->fpregset);
35f5886e
FF		 2600 }
2601#endif
2602}
2603
fb182850
FF		 2604/*
2605
35f5886e
FF		 2606LOCAL FUNCTION
2607
de43d7d0
SG		 2608 proc_init_failed - called whenever /proc access initialization
2609fails
35f5886e
FF		 2610
2611SYNOPSIS
2612
de43d7d0 2613 static void proc_init_failed (struct procinfo *pi, char *why)
35f5886e
FF		 2614
2615DESCRIPTION
2616
2617 This function is called whenever initialization of access to a /proc
2618 entry fails. It prints a suitable error message, does some cleanup,
2619 and then invokes the standard error processing routine which dumps
2620 us back into the command loop.
2621 */
2622
2623static void
de43d7d0
SG		 2624proc_init_failed (pi, why)
2625 struct procinfo *pi;
1ab3bf1b 2626 char *why;
35f5886e 2627{
de43d7d0
SG		 2628 print_sys_errmsg (pi->pathname, errno);
2629 kill (pi->pid, SIGKILL);
2630 close_proc_file (pi);
35f5886e
FF		 2631 error (why);
2632 /* NOTREACHED */
2633}
2634
2635/*
2636
2637LOCAL FUNCTION
2638
2639 close_proc_file - close any currently open /proc entry
2640
2641SYNOPSIS
2642
a39ad5ce 2643 static void close_proc_file (struct procinfo *pip)
35f5886e
FF		 2644
2645DESCRIPTION
2646
2647 Close any currently open /proc entry and mark the process information
2648 entry as invalid. In order to ensure that we don't try to reuse any
2649 stale information, the pid, fd, and pathnames are explicitly
2650 invalidated, which may be overkill.
2651
2652 */
2653
2654static void
1ab3bf1b
JG		 2655close_proc_file (pip)
2656 struct procinfo *pip;
35f5886e 2657{
de43d7d0
SG		 2658 struct procinfo *procinfo;
2659
2660 remove_fd (pip); /* Remove fd from poll/select list */
2661
2662 close (pip -> fd);
2663
2664 free (pip -> pathname);
2665
2666 /* Unlink pip from the procinfo chain. Note pip might not be on the list. */
2667
2668 if (procinfo_list == pip)
2669 procinfo_list = pip->next;
2670 else
2671 for (procinfo = procinfo_list; procinfo; procinfo = procinfo->next)
2672 if (procinfo->next == pip)
2673 procinfo->next = pip->next;
2674
2675 free (pip);
35f5886e
FF		 2676}
2677
2678/*
2679
2680LOCAL FUNCTION
2681
2682 open_proc_file - open a /proc entry for a given process id
2683
2684SYNOPSIS
2685
ec8ceca3 2686 static int open_proc_file (int pid, struct procinfo *pip, int mode)
35f5886e
FF		 2687
2688DESCRIPTION
2689
ec8ceca3
JG		 2690 Given a process id and a mode, close the existing open /proc
2691 entry (if any) and open one for the new process id, in the
2692 specified mode. Once it is open, then mark the local process
2693 information structure as valid, which guarantees that the pid,
2694 fd, and pathname fields match an open /proc entry. Returns
2695 zero if the open fails, nonzero otherwise.
35f5886e
FF		 2696
2697 Note that the pathname is left intact, even when the open fails,
2698 so that callers can use it to construct meaningful error messages
2699 rather than just "file open failed".
2700 */
2701
2702static int
ec8ceca3 2703open_proc_file (pid, pip, mode)
1ab3bf1b
JG		 2704 int pid;
2705 struct procinfo *pip;
ec8ceca3 2706 int mode;
35f5886e 2707{
de43d7d0
SG		 2708 pip -> next = NULL;
2709 pip -> had_event = 0;
2710 pip -> pathname = xmalloc (32);
2711 pip -> pid = pid;
2712
a39ad5ce 2713 sprintf (pip -> pathname, PROC_NAME_FMT, pid);
de43d7d0
SG		 2714 if ((pip -> fd = open (pip -> pathname, mode)) < 0)
2715 return 0;
2716
2717 return 1;
a39ad5ce
FF		 2718}
2719
f66f459f 2720static char *
1ab3bf1b
JG		 2721mappingflags (flags)
2722 long flags;
a39ad5ce 2723{
5c1c5e67 2724 static char asciiflags[8];
a39ad5ce 2725
5c1c5e67
FF		 2726 strcpy (asciiflags, "-------");
2727#if defined (MA_PHYS)
2728 if (flags & MA_PHYS) asciiflags[0] = 'd';
2729#endif
2730 if (flags & MA_STACK) asciiflags[1] = 's';
2731 if (flags & MA_BREAK) asciiflags[2] = 'b';
2732 if (flags & MA_SHARED) asciiflags[3] = 's';
2733 if (flags & MA_READ) asciiflags[4] = 'r';
2734 if (flags & MA_WRITE) asciiflags[5] = 'w';
2735 if (flags & MA_EXEC) asciiflags[6] = 'x';
a39ad5ce
FF		 2736 return (asciiflags);
2737}
2738
2739static void
cc221e76
FF		 2740info_proc_flags (pip, summary)
2741 struct procinfo *pip;
2742 int summary;
2743{
2744 struct trans *transp;
2745
2746 printf_filtered ("%-32s", "Process status flags:");
2747 if (!summary)
2748 {
2749 printf_filtered ("\n\n");
2750 }
2751 for (transp = pr_flag_table; transp -> name != NULL; transp++)
2752 {
2753 if (pip -> prstatus.pr_flags & transp -> value)
2754 {
2755 if (summary)
2756 {
2757 printf_filtered ("%s ", transp -> name);
2758 }
2759 else
2760 {
2761 printf_filtered ("\t%-16s %s.\n", transp -> name, transp -> desc);
2762 }
2763 }
2764 }
2765 printf_filtered ("\n");
2766}
2767
2768static void
2769info_proc_stop (pip, summary)
2770 struct procinfo *pip;
2771 int summary;
2772{
2773 struct trans *transp;
2774 int why;
2775 int what;
2776
2777 why = pip -> prstatus.pr_why;
2778 what = pip -> prstatus.pr_what;
2779
2780 if (pip -> prstatus.pr_flags & PR_STOPPED)
2781 {
2782 printf_filtered ("%-32s", "Reason for stopping:");
2783 if (!summary)
2784 {
2785 printf_filtered ("\n\n");
2786 }
2787 for (transp = pr_why_table; transp -> name != NULL; transp++)
2788 {
2789 if (why == transp -> value)
2790 {
2791 if (summary)
2792 {
2793 printf_filtered ("%s ", transp -> name);
2794 }
2795 else
2796 {
2797 printf_filtered ("\t%-16s %s.\n",
2798 transp -> name, transp -> desc);
2799 }
2800 break;
2801 }
2802 }
2803
2804 /* Use the pr_why field to determine what the pr_what field means, and
2805 print more information. */
2806
2807 switch (why)
2808 {
2809 case PR_REQUESTED:
2810 /* pr_what is unused for this case */
2811 break;
2812 case PR_JOBCONTROL:
2813 case PR_SIGNALLED:
2814 if (summary)
2815 {
2816 printf_filtered ("%s ", signalname (what));
2817 }
2818 else
2819 {
2820 printf_filtered ("\t%-16s %s.\n", signalname (what),
4ace50a5 2821 safe_strsignal (what));
cc221e76
FF		 2822 }
2823 break;
2824 case PR_SYSENTRY:
2825 if (summary)
2826 {
2827 printf_filtered ("%s ", syscallname (what));
2828 }
2829 else
2830 {
2831 printf_filtered ("\t%-16s %s.\n", syscallname (what),
2832 "Entered this system call");
2833 }
2834 break;
2835 case PR_SYSEXIT:
2836 if (summary)
2837 {
2838 printf_filtered ("%s ", syscallname (what));
2839 }
2840 else
2841 {
2842 printf_filtered ("\t%-16s %s.\n", syscallname (what),
2843 "Returned from this system call");
2844 }
2845 break;
2846 case PR_FAULTED:
2847 if (summary)
2848 {
2849 printf_filtered ("%s ",
2850 lookupname (faults_table, what, "fault"));
2851 }
2852 else
2853 {
2854 printf_filtered ("\t%-16s %s.\n",
2855 lookupname (faults_table, what, "fault"),
2856 lookupdesc (faults_table, what));
2857 }
2858 break;
2859 }
2860 printf_filtered ("\n");
2861 }
2862}
2863
2864static void
2865info_proc_siginfo (pip, summary)
2866 struct procinfo *pip;
2867 int summary;
2868{
2869 struct siginfo *sip;
2870
2871 if ((pip -> prstatus.pr_flags & PR_STOPPED) &&
2872 (pip -> prstatus.pr_why == PR_SIGNALLED ||
2873 pip -> prstatus.pr_why == PR_FAULTED))
2874 {
2875 printf_filtered ("%-32s", "Additional signal/fault info:");
2876 sip = &pip -> prstatus.pr_info;
2877 if (summary)
2878 {
2879 printf_filtered ("%s ", signalname (sip -> si_signo));
2880 if (sip -> si_errno > 0)
2881 {
4ace50a5 2882 printf_filtered ("%s ", errnoname (sip -> si_errno));
cc221e76
FF		 2883 }
2884 if (sip -> si_code <= 0)
2885 {
25286543
SG		 2886 printf_filtered ("sent by %s, uid %d ",
2887 target_pid_to_str (sip -> si_pid),
cc221e76
FF		 2888 sip -> si_uid);
2889 }
2890 else
2891 {
2892 printf_filtered ("%s ", sigcodename (sip));
2893 if ((sip -> si_signo == SIGILL) ||
2894 (sip -> si_signo == SIGFPE) ||
2895 (sip -> si_signo == SIGSEGV) ||
2896 (sip -> si_signo == SIGBUS))
2897 {
2898 printf_filtered ("addr=%#x ", sip -> si_addr);
2899 }
2900 else if ((sip -> si_signo == SIGCHLD))
2901 {
25286543
SG		 2902 printf_filtered ("child %s, status %u ",
2903 target_pid_to_str (sip -> si_pid),
cc221e76
FF		 2904 sip -> si_status);
2905 }
2906 else if ((sip -> si_signo == SIGPOLL))
2907 {
2908 printf_filtered ("band %u ", sip -> si_band);
2909 }
2910 }
2911 }
2912 else
2913 {
2914 printf_filtered ("\n\n");
2915 printf_filtered ("\t%-16s %s.\n", signalname (sip -> si_signo),
4ace50a5 2916 safe_strsignal (sip -> si_signo));
cc221e76
FF		 2917 if (sip -> si_errno > 0)
2918 {
2919 printf_filtered ("\t%-16s %s.\n",
4ace50a5
FF		 2920 errnoname (sip -> si_errno),
2921 safe_strerror (sip -> si_errno));
cc221e76
FF		 2922 }
2923 if (sip -> si_code <= 0)
2924 {
25286543 2925 printf_filtered ("\t%-16u %s\n", sip -> si_pid, /* XXX need target_pid_to_str() */
cc221e76
FF		 2926 "PID of process sending signal");
2927 printf_filtered ("\t%-16u %s\n", sip -> si_uid,
2928 "UID of process sending signal");
2929 }
2930 else
2931 {
2932 printf_filtered ("\t%-16s %s.\n", sigcodename (sip),
2933 sigcodedesc (sip));
2934 if ((sip -> si_signo == SIGILL) ||
2935 (sip -> si_signo == SIGFPE))
2936 {
2937 printf_filtered ("\t%-16#x %s.\n", sip -> si_addr,
2938 "Address of faulting instruction");
2939 }
2940 else if ((sip -> si_signo == SIGSEGV) ||
2941 (sip -> si_signo == SIGBUS))
2942 {
2943 printf_filtered ("\t%-16#x %s.\n", sip -> si_addr,
2944 "Address of faulting memory reference");
2945 }
2946 else if ((sip -> si_signo == SIGCHLD))
2947 {
25286543 2948 printf_filtered ("\t%-16u %s.\n", sip -> si_pid, /* XXX need target_pid_to_str() */
cc221e76
FF		 2949 "Child process ID");
2950 printf_filtered ("\t%-16u %s.\n", sip -> si_status,
2951 "Child process exit value or signal");
2952 }
2953 else if ((sip -> si_signo == SIGPOLL))
2954 {
2955 printf_filtered ("\t%-16u %s.\n", sip -> si_band,
2956 "Band event for POLL_{IN,OUT,MSG}");
2957 }
2958 }
2959 }
2960 printf_filtered ("\n");
2961 }
2962}
2963
2964static void
2965info_proc_syscalls (pip, summary)
2966 struct procinfo *pip;
2967 int summary;
2968{
2969 int syscallnum;
2970
2971 if (!summary)
2972 {
2973
2974#if 0 /* FIXME: Needs to use gdb-wide configured info about system calls. */
2975 if (pip -> prstatus.pr_flags & PR_ASLEEP)
2976 {
2977 int syscallnum = pip -> prstatus.pr_reg[R_D0];
2978 if (summary)
2979 {
2980 printf_filtered ("%-32s", "Sleeping in system call:");
2981 printf_filtered ("%s", syscallname (syscallnum));
2982 }
2983 else
2984 {
2985 printf_filtered ("Sleeping in system call '%s'.\n",
2986 syscallname (syscallnum));
2987 }
2988 }
2989#endif
2990
2991 if (ioctl (pip -> fd, PIOCGENTRY, &pip -> entryset) < 0)
2992 {
2993 print_sys_errmsg (pip -> pathname, errno);
2994 error ("PIOCGENTRY failed");
2995 }
2996
2997 if (ioctl (pip -> fd, PIOCGEXIT, &pip -> exitset) < 0)
2998 {
2999 print_sys_errmsg (pip -> pathname, errno);
3000 error ("PIOCGEXIT failed");
3001 }
3002
3003 printf_filtered ("System call tracing information:\n\n");
3004
3005 printf_filtered ("\t%-12s %-8s %-8s\n",
3006 "System call",
3007 "Entry",
3008 "Exit");
3009 for (syscallnum = 0; syscallnum < MAX_SYSCALLS; syscallnum++)
3010 {
3011 QUIT;
3012 if (syscall_table[syscallnum] != NULL)
3013 {
3014 printf_filtered ("\t%-12s ", syscall_table[syscallnum]);
3015 printf_filtered ("%-8s ",
3016 prismember (&pip -> entryset, syscallnum)
3017 ? "on" : "off");
3018 printf_filtered ("%-8s ",
3019 prismember (&pip -> exitset, syscallnum)
3020 ? "on" : "off");
3021 printf_filtered ("\n");
3022 }
3023 }
3024 printf_filtered ("\n");
3025 }
3026}
3027
3028static char *
3029signalname (signo)
3030 int signo;
3031{
4ace50a5
FF		 3032 char *name;
3033 static char locbuf[32];
3034
3035 name = strsigno (signo);
3036 if (name == NULL)
3037 {
3038 sprintf (locbuf, "Signal %d", signo);
3039 }
3040 else
3041 {
3042 sprintf (locbuf, "%s (%d)", name, signo);
3043 }
3044 return (locbuf);
3045}
3046
3047static char *
3048errnoname (errnum)
3049 int errnum;
3050{
3051 char *name;
cc221e76
FF		 3052 static char locbuf[32];
3053
4ace50a5
FF		 3054 name = strerrno (errnum);
3055 if (name == NULL)
cc221e76 3056 {
4ace50a5 3057 sprintf (locbuf, "Errno %d", errnum);
cc221e76
FF		 3058 }
3059 else
3060 {
4ace50a5 3061 sprintf (locbuf, "%s (%d)", name, errnum);
cc221e76
FF		 3062 }
3063 return (locbuf);
3064}
3065
3066static void
3067info_proc_signals (pip, summary)
3068 struct procinfo *pip;
3069 int summary;
3070{
3071 int signo;
3072
3073 if (!summary)
3074 {
3075 if (ioctl (pip -> fd, PIOCGTRACE, &pip -> trace) < 0)
3076 {
3077 print_sys_errmsg (pip -> pathname, errno);
3078 error ("PIOCGTRACE failed");
3079 }
3080
3081 printf_filtered ("Disposition of signals:\n\n");
3082 printf_filtered ("\t%-15s %-8s %-8s %-8s %s\n\n",
3083 "Signal", "Trace", "Hold", "Pending", "Description");
3084 for (signo = 0; signo < NSIG; signo++)
3085 {
3086 QUIT;
3087 printf_filtered ("\t%-15s ", signalname (signo));
3088 printf_filtered ("%-8s ",
3089 prismember (&pip -> trace, signo)
3090 ? "on" : "off");
3091 printf_filtered ("%-8s ",
3092 prismember (&pip -> prstatus.pr_sighold, signo)
3093 ? "on" : "off");
3094 printf_filtered ("%-8s ",
3095 prismember (&pip -> prstatus.pr_sigpend, signo)
3096 ? "yes" : "no");
4ace50a5 3097 printf_filtered (" %s\n", safe_strsignal (signo));
cc221e76
FF		 3098 }
3099 printf_filtered ("\n");
3100 }
3101}
3102
3103static void
3104info_proc_faults (pip, summary)
3105 struct procinfo *pip;
3106 int summary;
3107{
3108 struct trans *transp;
3109
3110 if (!summary)
3111 {
3112 if (ioctl (pip -> fd, PIOCGFAULT, &pip -> fltset) < 0)
3113 {
3114 print_sys_errmsg (pip -> pathname, errno);
3115 error ("PIOCGFAULT failed");
3116 }
3117
3118 printf_filtered ("Current traced hardware fault set:\n\n");
3119 printf_filtered ("\t%-12s %-8s\n", "Fault", "Trace");
3120
3121 for (transp = faults_table; transp -> name != NULL; transp++)
3122 {
3123 QUIT;
3124 printf_filtered ("\t%-12s ", transp -> name);
3125 printf_filtered ("%-8s", prismember (&pip -> fltset, transp -> value)
3126 ? "on" : "off");
3127 printf_filtered ("\n");
3128 }
3129 printf_filtered ("\n");
3130 }
3131}
3132
3133static void
3134info_proc_mappings (pip, summary)
1ab3bf1b 3135 struct procinfo *pip;
cc221e76 3136 int summary;
a39ad5ce
FF		 3137{
3138 int nmap;
3139 struct prmap *prmaps;
3140 struct prmap *prmap;
3141
cc221e76 3142 if (!summary)
a39ad5ce 3143 {
cc221e76 3144 printf_filtered ("Mapped address spaces:\n\n");
5c1c5e67 3145 printf_filtered ("\t%10s %10s %10s %10s %7s\n",
cc221e76
FF		 3146 "Start Addr",
3147 " End Addr",
3148 " Size",
3149 " Offset",
3150 "Flags");
3151 if (ioctl (pip -> fd, PIOCNMAP, &nmap) == 0)
a39ad5ce 3152 {
cc221e76
FF		 3153 prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
3154 if (ioctl (pip -> fd, PIOCMAP, prmaps) == 0)
a39ad5ce 3155 {
cc221e76
FF		 3156 for (prmap = prmaps; prmap -> pr_size; ++prmap)
3157 {
5c1c5e67 3158 printf_filtered ("\t%#10x %#10x %#10x %#10x %7s\n",
cc221e76
FF		 3159 prmap -> pr_vaddr,
3160 prmap -> pr_vaddr + prmap -> pr_size - 1,
3161 prmap -> pr_size,
3162 prmap -> pr_off,
3163 mappingflags (prmap -> pr_mflags));
3164 }
a39ad5ce
FF		 3165 }
3166 }
cc221e76 3167 printf_filtered ("\n");
a39ad5ce 3168 }
a39ad5ce
FF		 3169}
3170
3171/*
3172
3173LOCAL FUNCTION
3174
cc221e76 3175 info_proc -- implement the "info proc" command
a39ad5ce
FF		 3176
3177SYNOPSIS
3178
cc221e76 3179 void info_proc (char *args, int from_tty)
a39ad5ce
FF		 3180
3181DESCRIPTION
3182
3183 Implement gdb's "info proc" command by using the /proc interface
3184 to print status information about any currently running process.
3185
3186 Examples of the use of "info proc" are:
3187
cc221e76
FF		 3188 info proc (prints summary info for current inferior)
3189 info proc 123 (prints summary info for process with pid 123)
3190 info proc mappings (prints address mappings)
3191 info proc times (prints process/children times)
3192 info proc id (prints pid, ppid, gid, sid, etc)
3fbdd536 3193 FIXME: i proc id not implemented.
cc221e76 3194 info proc status (prints general process state info)
3fbdd536 3195 FIXME: i proc status not implemented.
cc221e76
FF		 3196 info proc signals (prints info about signal handling)
3197 info proc all (prints all info)
a39ad5ce
FF		 3198
3199 */
3200
3201static void
cc221e76 3202info_proc (args, from_tty)
1ab3bf1b
JG		 3203 char *args;
3204 int from_tty;
a39ad5ce 3205{
a39ad5ce 3206 int pid;
a39ad5ce
FF		 3207 struct procinfo *pip;
3208 struct cleanup *old_chain;
cc221e76
FF		 3209 char **argv;
3210 int argsize;
3211 int summary = 1;
3212 int flags = 0;
3213 int syscalls = 0;
3214 int signals = 0;
3215 int faults = 0;
3216 int mappings = 0;
3217 int times = 0;
3218 int id = 0;
3219 int status = 0;
3220 int all = 0;
a39ad5ce
FF		 3221
3222 old_chain = make_cleanup (null_cleanup, 0);
3223
de43d7d0
SG		 3224 /* Default to using the current inferior if no pid specified. Note
3225 that inferior_pid may be 0, hence we set okerr. */
a39ad5ce 3226
de43d7d0 3227 pip = find_procinfo (inferior_pid, 1);
a39ad5ce 3228
a39ad5ce 3229 if (args != NULL)
35f5886e 3230 {
cc221e76 3231 if ((argv = buildargv (args)) == NULL)
a39ad5ce 3232 {
cc221e76
FF		 3233 nomem (0);
3234 }
3235 make_cleanup (freeargv, (char *) argv);
3236
3237 while (*argv != NULL)
3238 {
3239 argsize = strlen (*argv);
3240 if (argsize >= 1 && strncmp (*argv, "all", argsize) == 0)
3241 {
3242 summary = 0;
3243 all = 1;
3244 }
3245 else if (argsize >= 2 && strncmp (*argv, "faults", argsize) == 0)
3246 {
3247 summary = 0;
3248 faults = 1;
3249 }
3250 else if (argsize >= 2 && strncmp (*argv, "flags", argsize) == 0)
3251 {
3252 summary = 0;
3253 flags = 1;
3254 }
3255 else if (argsize >= 1 && strncmp (*argv, "id", argsize) == 0)
3256 {
3257 summary = 0;
3258 id = 1;
3259 }
3260 else if (argsize >= 1 && strncmp (*argv, "mappings", argsize) == 0)
3261 {
3262 summary = 0;
3263 mappings = 1;
3264 }
3265 else if (argsize >= 2 && strncmp (*argv, "signals", argsize) == 0)
3266 {
3267 summary = 0;
3268 signals = 1;
3269 }
3270 else if (argsize >= 2 && strncmp (*argv, "status", argsize) == 0)
3271 {
3272 summary = 0;
3273 status = 1;
3274 }
3275 else if (argsize >= 2 && strncmp (*argv, "syscalls", argsize) == 0)
3276 {
3277 summary = 0;
3278 syscalls = 1;
3279 }
3280 else if (argsize >= 1 && strncmp (*argv, "times", argsize) == 0)
a39ad5ce 3281 {
cc221e76
FF		 3282 summary = 0;
3283 times = 1;
a39ad5ce 3284 }
de43d7d0 3285 else if ((pid = atoi (*argv)) > 0)
a39ad5ce 3286 {
de43d7d0
SG		 3287 pip = (struct procinfo *) xmalloc (sizeof (struct procinfo));
3288 memset (pip, 0, sizeof (*pip));
3289
3290 pip->pid = pid;
ec8ceca3 3291 if (!open_proc_file (pid, pip, O_RDONLY))
a39ad5ce
FF		 3292 {
3293 perror_with_name (pip -> pathname);
3294 /* NOTREACHED */
3295 }
3296 make_cleanup (close_proc_file, pip);
3297 }
cc221e76
FF		 3298 else if (**argv != '\000')
3299 {
3300 error ("Unrecognized or ambiguous keyword `%s'.", *argv);
3301 }
3302 argv++;
a39ad5ce 3303 }
35f5886e 3304 }
a39ad5ce
FF		 3305
3306 /* If we don't have a valid open process at this point, then we have no
3307 inferior or didn't specify a specific pid. */
3308
de43d7d0 3309 if (!pip)
35f5886e 3310 {
6fe90fc8
JK		 3311 error ("\
3312No process. Start debugging a program or specify an explicit process ID.");
35f5886e 3313 }
a39ad5ce 3314 if (ioctl (pip -> fd, PIOCSTATUS, &(pip -> prstatus)) < 0)
35f5886e 3315 {
a39ad5ce
FF		 3316 print_sys_errmsg (pip -> pathname, errno);
3317 error ("PIOCSTATUS failed");
35f5886e 3318 }
a39ad5ce 3319
cc221e76
FF		 3320 /* Print verbose information of the requested type(s), or just a summary
3321 of the information for all types. */
3322
3323 printf_filtered ("\nInformation for %s:\n\n", pip -> pathname);
3324 if (summary || all || flags)
3325 {
3326 info_proc_flags (pip, summary);
3327 }
3328 if (summary || all)
3329 {
3330 info_proc_stop (pip, summary);
3331 }
3332 if (summary || all || signals || faults)
3333 {
3334 info_proc_siginfo (pip, summary);
3335 }
3336 if (summary || all || syscalls)
3337 {
3338 info_proc_syscalls (pip, summary);
3339 }
3340 if (summary || all || mappings)
3341 {
3342 info_proc_mappings (pip, summary);
3343 }
3344 if (summary || all || signals)
3345 {
3346 info_proc_signals (pip, summary);
3347 }
3348 if (summary || all || faults)
3349 {
3350 info_proc_faults (pip, summary);
3351 }
3352 printf_filtered ("\n");
a39ad5ce
FF		 3353
3354 /* All done, deal with closing any temporary process info structure,
3355 freeing temporary memory , etc. */
3356
3357 do_cleanups (old_chain);
3358}
3359
de43d7d0
SG		 3360/*
3361
3362LOCAL FUNCTION
3363
3364 procfs_set_sproc_trap -- arrange for exec'd child stop on sproc
3365
3366SYNOPSIS
3367
3368 void procfs_set_sproc_trap (void)
3369
3370DESCRIPTION
3371
3372 This function sets up a trap on sproc system call exits so that we can
3373 detect the arrival of a new thread. We are called with the child
3374 stopped prior to it's first instruction.
3375
3376 Also note that we turn on the inherit-on-fork flag in the child process
3377 so that any grand-children start with all tracing flags set.
3378 */
3379
952a820e
SG		 3380#ifdef SYS_sproc
3381
de43d7d0
SG		 3382static void
3383procfs_set_sproc_trap (pi)
3384 struct procinfo *pi;
3385{
3386 sysset_t exitset;
3387
3388 if (ioctl (pi->fd, PIOCGEXIT, &exitset) < 0)
3389 {
3390 print_sys_errmsg (pi->pathname, errno);
3391 error ("PIOCGEXIT failed");
3392 }
3393
de43d7d0 3394 praddset (&exitset, SYS_sproc);
de43d7d0
SG		 3395
3396 if (ioctl (pi->fd, PIOCSEXIT, &exitset) < 0)
3397 {
3398 print_sys_errmsg (pi->pathname, errno);
3399 error ("PIOCSEXIT failed");
3400 }
3401
3402 /* Turn on inherit-on-fork flag so that all grand-children of gdb start with
3403 tracing flags set. */
3404
3405#ifdef PIOCSET /* New method */
3406 {
3407 long pr_flags;
3408 pr_flags = PR_FORK;
3409 ioctl (pi->fd, PIOCSET, &pr_flags);
3410 }
3411#else
3412#ifdef PIOCSFORK /* Original method */
3413 ioctl (pi->fd, PIOCSFORK, NULL);
3414#endif
3415#endif
3416}
952a820e 3417#endif /* SYS_sproc */
de43d7d0 3418
3fbdd536
JG		 3419/* Fork an inferior process, and start debugging it with /proc. */
3420
3421static void
3422procfs_create_inferior (exec_file, allargs, env)
3423 char *exec_file;
3424 char *allargs;
3425 char **env;
3426{
08f74b92
JK		 3427 char *shell_file = getenv ("SHELL");
3428 char *tryname;
3429 if (shell_file != NULL && strchr (shell_file, '/') == NULL)
3430 {
3431
3432 /* We will be looking down the PATH to find shell_file. If we
3433 just do this the normal way (via execlp, which operates by
3434 attempting an exec for each element of the PATH until it
3435 finds one which succeeds), then there will be an exec for
3436 each failed attempt, each of which will cause a PR_SYSEXIT
3437 stop, and we won't know how to distinguish the PR_SYSEXIT's
3438 for these failed execs with the ones for successful execs
3439 (whether the exec has succeeded is stored at that time in the
3440 carry bit or some such architecture-specific and
3441 non-ABI-specified place).
3442
3443 So I can't think of anything better than to search the PATH
3444 now. This has several disadvantages: (1) There is a race
3445 condition; if we find a file now and it is deleted before we
3446 exec it, we lose, even if the deletion leaves a valid file
3447 further down in the PATH, (2) there is no way to know exactly
3448 what an executable (in the sense of "capable of being
3449 exec'd") file is. Using access() loses because it may lose
3450 if the caller is the superuser; failing to use it loses if
3451 there are ACLs or some such. */
3452
3453 char *p;
3454 char *p1;
3455 /* FIXME-maybe: might want "set path" command to replace putenv hack
3456 in set_in_environ. */
3457 char *path = getenv ("PATH");
3458 int len;
3459 struct stat statbuf;
3460
3461 if (path == NULL)
3462 path = "/bin:/usr/bin";
3463
3464 tryname = alloca (strlen (path) + strlen (shell_file) + 2);
3465 for (p = path; p != NULL; p = p1 ? p1 + 1: NULL)
3466 {
3467 p1 = strchr (p, ':');
3468 if (p1 != NULL)
3469 len = p1 - p;
3470 else
3471 len = strlen (p);
3472 strncpy (tryname, p, len);
3473 tryname[len] = '\0';
3474 strcat (tryname, "/");
3475 strcat (tryname, shell_file);
3476 if (access (tryname, X_OK) < 0)
3477 continue;
3478 if (stat (tryname, &statbuf) < 0)
3479 continue;
3480 if (!S_ISREG (statbuf.st_mode))
3481 /* We certainly need to reject directories. I'm not quite
3482 as sure about FIFOs, sockets, etc., but I kind of doubt
3483 that people want to exec() these things. */
3484 continue;
3485 break;
3486 }
3487 if (p == NULL)
3488 /* Not found. This must be an error rather than merely passing
3489 the file to execlp(), because execlp() would try all the
3490 exec()s, causing GDB to get confused. */
3491 error ("Can't find shell %s in PATH", shell_file);
3492
3493 shell_file = tryname;
3494 }
3495
3fbdd536 3496 fork_inferior (exec_file, allargs, env,
08f74b92
JK		 3497 proc_set_exec_trap, procfs_init_inferior, shell_file);
3498
3fbdd536
JG		 3499 /* We are at the first instruction we care about. */
3500 /* Pedal to the metal... */
de43d7d0
SG		 3501
3502 /* Setup traps on exit from sproc() */
3503
952a820e
SG		 3504#ifdef SYS_sproc
3505 procfs_set_sproc_trap (current_procinfo);
3506#endif
de43d7d0 3507
67ac9759 3508 proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
3fbdd536
JG		 3509}
3510
3511/* Clean up after the inferior dies. */
3512
3513static void
3514procfs_mourn_inferior ()
3515{
fb63d460
SG		 3516 struct procinfo *pi;
3517
3518 for (pi = procinfo_list; pi; pi = pi->next)
3519 unconditionally_kill_inferior (pi);
3520
3fbdd536
JG		 3521 unpush_target (&procfs_ops);
3522 generic_mourn_inferior ();
3523}
3524
3525/* Mark our target-struct as eligible for stray "run" and "attach" commands. */
3526static int
3527procfs_can_run ()
3528{
3529 return(1);
3530}
3531\f
3532struct target_ops procfs_ops = {
3533 "procfs", /* to_shortname */
3534 "Unix /proc child process", /* to_longname */
3535 "Unix /proc child process (started by the \"run\" command).", /* to_doc */
3536 procfs_open, /* to_open */
3537 0, /* to_close */
3538 procfs_attach, /* to_attach */
3539 procfs_detach, /* to_detach */
3540 procfs_resume, /* to_resume */
3541 procfs_wait, /* to_wait */
3542 procfs_fetch_registers, /* to_fetch_registers */
3543 procfs_store_registers, /* to_store_registers */
3544 procfs_prepare_to_store, /* to_prepare_to_store */
3545 procfs_xfer_memory, /* to_xfer_memory */
3546 procfs_files_info, /* to_files_info */
3547 memory_insert_breakpoint, /* to_insert_breakpoint */
3548 memory_remove_breakpoint, /* to_remove_breakpoint */
3549 terminal_init_inferior, /* to_terminal_init */
3550 terminal_inferior, /* to_terminal_inferior */
3551 terminal_ours_for_output, /* to_terminal_ours_for_output */
3552 terminal_ours, /* to_terminal_ours */
3553 child_terminal_info, /* to_terminal_info */
3554 procfs_kill_inferior, /* to_kill */
3555 0, /* to_load */
3556 0, /* to_lookup_symbol */
3557 procfs_create_inferior, /* to_create_inferior */
3558 procfs_mourn_inferior, /* to_mourn_inferior */
3559 procfs_can_run, /* to_can_run */
3950a34e 3560 procfs_notice_signals, /* to_notice_signals */
3fbdd536
JG		 3561 process_stratum, /* to_stratum */
3562 0, /* to_next */
3563 1, /* to_has_all_memory */
3564 1, /* to_has_memory */
3565 1, /* to_has_stack */
3566 1, /* to_has_registers */
3567 1, /* to_has_execution */
3568 0, /* sections */
3569 0, /* sections_end */
3570 OPS_MAGIC /* to_magic */
3571};
3572
3fbdd536
JG		 3573void
3574_initialize_procfs ()
3575{
3576 add_target (&procfs_ops);
3577
3578 add_info ("proc", info_proc,
cc221e76
FF		 3579"Show process status information using /proc entry.\n\
3580Specify process id or use current inferior by default.\n\
3581Specify keywords for detailed information; default is summary.\n\
3582Keywords are: `all', `faults', `flags', `id', `mappings', `signals',\n\
3583`status', `syscalls', and `times'.\n\
3fbdd536 3584Unambiguous abbreviations may be used.");
a39ad5ce 3585
cc221e76 3586 init_syscall_table ();
35f5886e 3587}
GDB Binutils - Deliverables
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