1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
|
/* QNX Neutrino specific low level interface, for the remote server
for GDB.
Copyright (C) 2009-2013 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "server.h"
#include "gdbthread.h"
#include "nto-low.h"
#include "hostio.h"
#include <limits.h>
#include <fcntl.h>
#include <spawn.h>
#include <sys/procfs.h>
#include <sys/auxv.h>
#include <stdarg.h>
#include <sys/iomgr.h>
#include <sys/neutrino.h>
extern int using_threads;
int using_threads = 1;
const struct target_desc *nto_tdesc;
static void
nto_trace (const char *fmt, ...)
{
va_list arg_list;
if (debug_threads == 0)
return;
fprintf (stderr, "nto:");
va_start (arg_list, fmt);
vfprintf (stderr, fmt, arg_list);
va_end (arg_list);
}
#define TRACE nto_trace
/* Structure holding neutrino specific information about
inferior. */
struct nto_inferior
{
char nto_procfs_path[PATH_MAX];
int ctl_fd;
pid_t pid;
int exit_signo; /* For tracking exit status. */
};
static struct nto_inferior nto_inferior;
static void
init_nto_inferior (struct nto_inferior *nto_inferior)
{
memset (nto_inferior, 0, sizeof (struct nto_inferior));
nto_inferior->ctl_fd = -1;
nto_inferior->pid = -1;
}
static void
do_detach (void)
{
if (nto_inferior.ctl_fd != -1)
{
nto_trace ("Closing fd\n");
close (nto_inferior.ctl_fd);
init_nto_inferior (&nto_inferior);
}
}
/* Set current thread. Return 1 on success, 0 otherwise. */
static int
nto_set_thread (ptid_t ptid)
{
int res = 0;
TRACE ("%s pid: %d tid: %ld\n", __func__, ptid_get_pid (ptid),
ptid_get_lwp (ptid));
if (nto_inferior.ctl_fd != -1
&& !ptid_equal (ptid, null_ptid)
&& !ptid_equal (ptid, minus_one_ptid))
{
pthread_t tid = ptid_get_lwp (ptid);
if (EOK == devctl (nto_inferior.ctl_fd, DCMD_PROC_CURTHREAD, &tid,
sizeof (tid), 0))
res = 1;
else
TRACE ("%s: Error: failed to set current thread\n", __func__);
}
return res;
}
/* This function will determine all alive threads. Note that we do not list
dead but unjoined threads even though they are still in the process' thread
list.
NTO_INFERIOR must not be NULL. */
static void
nto_find_new_threads (struct nto_inferior *nto_inferior)
{
pthread_t tid;
TRACE ("%s pid:%d\n", __func__, nto_inferior->pid);
if (nto_inferior->ctl_fd == -1)
return;
for (tid = 1;; ++tid)
{
procfs_status status;
ptid_t ptid;
int err;
status.tid = tid;
err = devctl (nto_inferior->ctl_fd, DCMD_PROC_TIDSTATUS, &status,
sizeof (status), 0);
if (err != EOK || status.tid == 0)
break;
/* All threads in between are gone. */
while (tid != status.tid || status.state == STATE_DEAD)
{
struct thread_info *ti;
ptid = ptid_build (nto_inferior->pid, tid, 0);
ti = find_thread_ptid (ptid);
if (ti != NULL)
{
TRACE ("Removing thread %d\n", tid);
remove_thread (ti);
}
if (tid == status.tid)
break;
++tid;
}
if (status.state != STATE_DEAD)
{
TRACE ("Adding thread %d\n", tid);
ptid = ptid_build (nto_inferior->pid, tid, 0);
if (!find_thread_ptid (ptid))
add_thread (ptid, NULL);
}
}
}
/* Given pid, open procfs path. */
static pid_t
do_attach (pid_t pid)
{
procfs_status status;
struct sigevent event;
if (nto_inferior.ctl_fd != -1)
{
close (nto_inferior.ctl_fd);
init_nto_inferior (&nto_inferior);
}
xsnprintf (nto_inferior.nto_procfs_path, PATH_MAX - 1, "/proc/%d/as", pid);
nto_inferior.ctl_fd = open (nto_inferior.nto_procfs_path, O_RDWR);
if (nto_inferior.ctl_fd == -1)
{
TRACE ("Failed to open %s\n", nto_inferior.nto_procfs_path);
init_nto_inferior (&nto_inferior);
return -1;
}
if (devctl (nto_inferior.ctl_fd, DCMD_PROC_STOP, &status, sizeof (status), 0)
!= EOK)
{
do_detach ();
return -1;
}
nto_inferior.pid = pid;
/* Define a sigevent for process stopped notification. */
event.sigev_notify = SIGEV_SIGNAL_THREAD;
event.sigev_signo = SIGUSR1;
event.sigev_code = 0;
event.sigev_value.sival_ptr = NULL;
event.sigev_priority = -1;
devctl (nto_inferior.ctl_fd, DCMD_PROC_EVENT, &event, sizeof (event), 0);
if (devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status),
0) == EOK
&& (status.flags & _DEBUG_FLAG_STOPPED))
{
ptid_t ptid;
struct process_info *proc;
kill (pid, SIGCONT);
ptid = ptid_build (status.pid, status.tid, 0);
the_low_target.arch_setup ();
proc = add_process (status.pid, 1);
proc->tdesc = nto_tdesc;
TRACE ("Adding thread: pid=%d tid=%ld\n", status.pid,
ptid_get_lwp (ptid));
nto_find_new_threads (&nto_inferior);
}
else
{
do_detach ();
return -1;
}
return pid;
}
/* Read or write LEN bytes from/to inferior's MEMADDR memory address
into gdbservers's MYADDR buffer. Return number of bytes actually
transfered. */
static int
nto_xfer_memory (off_t memaddr, unsigned char *myaddr, int len,
int dowrite)
{
int nbytes = 0;
if (lseek (nto_inferior.ctl_fd, memaddr, SEEK_SET) == memaddr)
{
if (dowrite)
nbytes = write (nto_inferior.ctl_fd, myaddr, len);
else
nbytes = read (nto_inferior.ctl_fd, myaddr, len);
if (nbytes < 0)
nbytes = 0;
}
if (nbytes == 0)
{
int e = errno;
TRACE ("Error in %s : errno=%d (%s)\n", __func__, e, strerror (e));
}
return nbytes;
}
/* Insert or remove breakpoint or watchpoint at address ADDR.
TYPE can be one of Neutrino breakpoint types. SIZE must be 0 for
inserting the point, -1 for removing it.
Return 0 on success, 1 otherwise. */
static int
nto_breakpoint (CORE_ADDR addr, int type, int size)
{
procfs_break brk;
brk.type = type;
brk.addr = addr;
brk.size = size;
if (devctl (nto_inferior.ctl_fd, DCMD_PROC_BREAK, &brk, sizeof (brk), 0)
!= EOK)
return 1;
return 0;
}
/* Read auxiliary vector from inferior's initial stack into gdbserver's
MYADDR buffer, up to LEN bytes.
Return number of bytes read. */
static int
nto_read_auxv_from_initial_stack (CORE_ADDR initial_stack,
unsigned char *myaddr,
unsigned int len)
{
int data_ofs = 0;
int anint;
unsigned int len_read = 0;
/* Skip over argc, argv and envp... Comment from ldd.c:
The startup frame is set-up so that we have:
auxv
NULL
...
envp2
envp1 <----- void *frame + (argc + 2) * sizeof(char *)
NULL
...
argv2
argv1
argc <------ void * frame
On entry to ldd, frame gives the address of argc on the stack. */
if (nto_xfer_memory (initial_stack, (unsigned char *)&anint,
sizeof (anint), 0) != sizeof (anint))
return 0;
/* Size of pointer is assumed to be 4 bytes (32 bit arch. ) */
data_ofs += (anint + 2) * sizeof (void *); /* + 2 comes from argc itself and
NULL terminating pointer in
argv. */
/* Now loop over env table: */
while (nto_xfer_memory (initial_stack + data_ofs,
(unsigned char *)&anint, sizeof (anint), 0)
== sizeof (anint))
{
data_ofs += sizeof (anint);
if (anint == 0)
break;
}
initial_stack += data_ofs;
memset (myaddr, 0, len);
while (len_read <= len - sizeof (auxv_t))
{
auxv_t *auxv = (auxv_t *)myaddr;
/* Search backwards until we have read AT_PHDR (num. 3),
AT_PHENT (num 4), AT_PHNUM (num 5) */
if (nto_xfer_memory (initial_stack, (unsigned char *)auxv,
sizeof (auxv_t), 0) == sizeof (auxv_t))
{
if (auxv->a_type != AT_NULL)
{
auxv++;
len_read += sizeof (auxv_t);
}
if (auxv->a_type == AT_PHNUM) /* That's all we need. */
break;
initial_stack += sizeof (auxv_t);
}
else
break;
}
TRACE ("auxv: len_read: %d\n", len_read);
return len_read;
}
/* Start inferior specified by PROGRAM passing arguments ALLARGS. */
static int
nto_create_inferior (char *program, char **allargs)
{
struct inheritance inherit;
pid_t pid;
sigset_t set;
TRACE ("%s %s\n", __func__, program);
/* Clear any pending SIGUSR1's but keep the behavior the same. */
signal (SIGUSR1, signal (SIGUSR1, SIG_IGN));
sigemptyset (&set);
sigaddset (&set, SIGUSR1);
sigprocmask (SIG_UNBLOCK, &set, NULL);
memset (&inherit, 0, sizeof (inherit));
inherit.flags |= SPAWN_SETGROUP | SPAWN_HOLD;
inherit.pgroup = SPAWN_NEWPGROUP;
pid = spawnp (program, 0, NULL, &inherit, allargs, 0);
sigprocmask (SIG_BLOCK, &set, NULL);
if (pid == -1)
return -1;
if (do_attach (pid) != pid)
return -1;
return pid;
}
/* Attach to process PID. */
static int
nto_attach (unsigned long pid)
{
TRACE ("%s %ld\n", __func__, pid);
if (do_attach (pid) != pid)
error ("Unable to attach to %ld\n", pid);
return 0;
}
/* Send signal to process PID. */
static int
nto_kill (int pid)
{
TRACE ("%s %d\n", __func__, pid);
kill (pid, SIGKILL);
do_detach ();
return 0;
}
/* Detach from process PID. */
static int
nto_detach (int pid)
{
TRACE ("%s %d\n", __func__, pid);
do_detach ();
return 0;
}
static void
nto_mourn (struct process_info *process)
{
remove_process (process);
}
/* Check if the given thread is alive.
Return 1 if alive, 0 otherwise. */
static int
nto_thread_alive (ptid_t ptid)
{
int res;
TRACE ("%s pid:%d tid:%d\n", __func__, ptid_get_pid (ptid),
ptid_get_lwp (ptid));
if (SignalKill (0, ptid_get_pid (ptid), ptid_get_lwp (ptid),
0, 0, 0) == -1)
res = 0;
else
res = 1;
TRACE ("%s: %s\n", __func__, res ? "yes" : "no");
return res;
}
/* Resume inferior's execution. */
static void
nto_resume (struct thread_resume *resume_info, size_t n)
{
/* We can only work in all-stop mode. */
procfs_status status;
procfs_run run;
int err;
TRACE ("%s\n", __func__);
/* Workaround for aliasing rules violation. */
sigset_t *run_fault = (sigset_t *) (void *) &run.fault;
nto_set_thread (resume_info->thread);
run.flags = _DEBUG_RUN_FAULT | _DEBUG_RUN_TRACE;
if (resume_info->kind == resume_step)
run.flags |= _DEBUG_RUN_STEP;
run.flags |= _DEBUG_RUN_ARM;
sigemptyset (run_fault);
sigaddset (run_fault, FLTBPT);
sigaddset (run_fault, FLTTRACE);
sigaddset (run_fault, FLTILL);
sigaddset (run_fault, FLTPRIV);
sigaddset (run_fault, FLTBOUNDS);
sigaddset (run_fault, FLTIOVF);
sigaddset (run_fault, FLTIZDIV);
sigaddset (run_fault, FLTFPE);
sigaddset (run_fault, FLTPAGE);
sigaddset (run_fault, FLTSTACK);
sigaddset (run_fault, FLTACCESS);
sigemptyset (&run.trace);
if (resume_info->sig)
{
int signal_to_pass;
devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status),
0);
signal_to_pass = resume_info->sig;
if (status.why & (_DEBUG_WHY_SIGNALLED | _DEBUG_WHY_FAULTED))
{
if (signal_to_pass != status.info.si_signo)
{
kill (status.pid, signal_to_pass);
run.flags |= _DEBUG_RUN_CLRFLT | _DEBUG_RUN_CLRSIG;
}
else /* Let it kill the program without telling us. */
sigdelset (&run.trace, signal_to_pass);
}
}
else
run.flags |= _DEBUG_RUN_CLRSIG | _DEBUG_RUN_CLRFLT;
sigfillset (&run.trace);
regcache_invalidate ();
err = devctl (nto_inferior.ctl_fd, DCMD_PROC_RUN, &run, sizeof (run), 0);
if (err != EOK)
TRACE ("Error: %d \"%s\"\n", err, strerror (err));
}
/* Wait for inferior's event.
Return ptid of thread that caused the event. */
static ptid_t
nto_wait (ptid_t ptid,
struct target_waitstatus *ourstatus, int target_options)
{
sigset_t set;
siginfo_t info;
procfs_status status;
const int trace_mask = (_DEBUG_FLAG_TRACE_EXEC | _DEBUG_FLAG_TRACE_RD
| _DEBUG_FLAG_TRACE_WR | _DEBUG_FLAG_TRACE_MODIFY);
TRACE ("%s\n", __func__);
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
sigemptyset (&set);
sigaddset (&set, SIGUSR1);
devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0);
while (!(status.flags & _DEBUG_FLAG_ISTOP))
{
sigwaitinfo (&set, &info);
devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status),
0);
}
nto_find_new_threads (&nto_inferior);
if (status.flags & _DEBUG_FLAG_SSTEP)
{
TRACE ("SSTEP\n");
ourstatus->kind = TARGET_WAITKIND_STOPPED;
ourstatus->value.sig = GDB_SIGNAL_TRAP;
}
/* Was it a breakpoint? */
else if (status.flags & trace_mask)
{
TRACE ("STOPPED\n");
ourstatus->kind = TARGET_WAITKIND_STOPPED;
ourstatus->value.sig = GDB_SIGNAL_TRAP;
}
else if (status.flags & _DEBUG_FLAG_ISTOP)
{
TRACE ("ISTOP\n");
switch (status.why)
{
case _DEBUG_WHY_SIGNALLED:
TRACE (" SIGNALLED\n");
ourstatus->kind = TARGET_WAITKIND_STOPPED;
ourstatus->value.sig =
gdb_signal_from_host (status.info.si_signo);
nto_inferior.exit_signo = ourstatus->value.sig;
break;
case _DEBUG_WHY_FAULTED:
TRACE (" FAULTED\n");
ourstatus->kind = TARGET_WAITKIND_STOPPED;
if (status.info.si_signo == SIGTRAP)
{
ourstatus->value.sig = 0;
nto_inferior.exit_signo = 0;
}
else
{
ourstatus->value.sig =
gdb_signal_from_host (status.info.si_signo);
nto_inferior.exit_signo = ourstatus->value.sig;
}
break;
case _DEBUG_WHY_TERMINATED:
{
int waitval = 0;
TRACE (" TERMINATED\n");
waitpid (ptid_get_pid (ptid), &waitval, WNOHANG);
if (nto_inferior.exit_signo)
{
/* Abnormal death. */
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
ourstatus->value.sig = nto_inferior.exit_signo;
}
else
{
/* Normal death. */
ourstatus->kind = TARGET_WAITKIND_EXITED;
ourstatus->value.integer = WEXITSTATUS (waitval);
}
nto_inferior.exit_signo = 0;
break;
}
case _DEBUG_WHY_REQUESTED:
TRACE ("REQUESTED\n");
/* We are assuming a requested stop is due to a SIGINT. */
ourstatus->kind = TARGET_WAITKIND_STOPPED;
ourstatus->value.sig = GDB_SIGNAL_INT;
nto_inferior.exit_signo = 0;
break;
}
}
return ptid_build (status.pid, status.tid, 0);
}
/* Fetch inferior's registers for currently selected thread (CURRENT_INFERIOR).
If REGNO is -1, fetch all registers, or REGNO register only otherwise. */
static void
nto_fetch_registers (struct regcache *regcache, int regno)
{
int regsize;
procfs_greg greg;
ptid_t ptid;
TRACE ("%s (regno=%d)\n", __func__, regno);
if (regno >= the_low_target.num_regs)
return;
if (current_inferior == NULL)
{
TRACE ("current_inferior is NULL\n");
return;
}
ptid = thread_to_gdb_id (current_inferior);
if (!nto_set_thread (ptid))
return;
if (devctl (nto_inferior.ctl_fd, DCMD_PROC_GETGREG, &greg, sizeof (greg),
®size) == EOK)
{
if (regno == -1) /* All registers. */
{
for (regno = 0; regno != the_low_target.num_regs; ++regno)
{
const unsigned int registeroffset
= the_low_target.register_offset (regno);
supply_register (regcache, regno,
((char *)&greg) + registeroffset);
}
}
else
{
const unsigned int registeroffset
= the_low_target.register_offset (regno);
if (registeroffset == -1)
return;
supply_register (regcache, regno, ((char *)&greg) + registeroffset);
}
}
else
TRACE ("ERROR reading registers from inferior.\n");
}
/* Store registers for currently selected thread (CURRENT_INFERIOR).
We always store all registers, regardless of REGNO. */
static void
nto_store_registers (struct regcache *regcache, int regno)
{
procfs_greg greg;
int err;
ptid_t ptid;
TRACE ("%s (regno:%d)\n", __func__, regno);
if (current_inferior == NULL)
{
TRACE ("current_inferior is NULL\n");
return;
}
ptid = thread_to_gdb_id (current_inferior);
if (!nto_set_thread (ptid))
return;
memset (&greg, 0, sizeof (greg));
for (regno = 0; regno != the_low_target.num_regs; ++regno)
{
const unsigned int regoffset
= the_low_target.register_offset (regno);
collect_register (regcache, regno, ((char *)&greg) + regoffset);
}
err = devctl (nto_inferior.ctl_fd, DCMD_PROC_SETGREG, &greg, sizeof (greg),
0);
if (err != EOK)
TRACE ("Error: setting registers.\n");
}
/* Read LEN bytes from inferior's memory address MEMADDR into
gdbserver's MYADDR buffer.
Return 0 on success -1 otherwise. */
static int
nto_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
{
TRACE ("%s memaddr:0x%08lx, len:%d\n", __func__, memaddr, len);
if (nto_xfer_memory (memaddr, myaddr, len, 0) != len)
{
TRACE ("Failed to read memory\n");
return -1;
}
return 0;
}
/* Write LEN bytes from gdbserver's buffer MYADDR into inferior's
memory at address MEMADDR.
Return 0 on success -1 otherwise. */
static int
nto_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
{
int len_written;
TRACE ("%s memaddr: 0x%08llx len: %d\n", __func__, memaddr, len);
if ((len_written = nto_xfer_memory (memaddr, (unsigned char *)myaddr, len,
1))
!= len)
{
TRACE ("Wanted to write: %d but written: %d\n", len, len_written);
return -1;
}
return 0;
}
/* Stop inferior. We always stop all threads. */
static void
nto_request_interrupt (void)
{
TRACE ("%s\n", __func__);
nto_set_thread (ptid_build (nto_inferior.pid, 1, 0));
if (EOK != devctl (nto_inferior.ctl_fd, DCMD_PROC_STOP, NULL, 0, 0))
TRACE ("Error stopping inferior.\n");
}
/* Read auxiliary vector from inferior's memory into gdbserver's buffer
MYADDR. We always read whole auxv.
Return number of bytes stored in MYADDR buffer, 0 if OFFSET > 0
or -1 on error. */
static int
nto_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len)
{
int err;
CORE_ADDR initial_stack;
procfs_info procinfo;
TRACE ("%s\n", __func__);
if (offset > 0)
return 0;
err = devctl (nto_inferior.ctl_fd, DCMD_PROC_INFO, &procinfo,
sizeof procinfo, 0);
if (err != EOK)
return -1;
initial_stack = procinfo.initial_stack;
return nto_read_auxv_from_initial_stack (initial_stack, myaddr, len);
}
/* Insert {break/watch}point at address ADDR.
TYPE must be in '0'..'4' range. LEN is not used. */
static int
nto_insert_point (char type, CORE_ADDR addr, int len)
{
int wtype = _DEBUG_BREAK_HW; /* Always request HW. */
TRACE ("%s type:%c addr: 0x%08lx len:%d\n", __func__, (int)type, addr, len);
switch (type)
{
case '0': /* software-breakpoint */
wtype = _DEBUG_BREAK_EXEC;
break;
case '1': /* hardware-breakpoint */
wtype |= _DEBUG_BREAK_EXEC;
break;
case '2': /* write watchpoint */
wtype |= _DEBUG_BREAK_RW;
break;
case '3': /* read watchpoint */
wtype |= _DEBUG_BREAK_RD;
break;
case '4': /* access watchpoint */
wtype |= _DEBUG_BREAK_RW;
break;
default:
return 1; /* Not supported. */
}
return nto_breakpoint (addr, wtype, 0);
}
/* Remove {break/watch}point at address ADDR.
TYPE must be in '0'..'4' range. LEN is not used. */
static int
nto_remove_point (char type, CORE_ADDR addr, int len)
{
int wtype = _DEBUG_BREAK_HW; /* Always request HW. */
TRACE ("%s type:%c addr: 0x%08lx len:%d\n", __func__, (int)type, addr, len);
switch (type)
{
case '0': /* software-breakpoint */
wtype = _DEBUG_BREAK_EXEC;
break;
case '1': /* hardware-breakpoint */
wtype |= _DEBUG_BREAK_EXEC;
break;
case '2': /* write watchpoint */
wtype |= _DEBUG_BREAK_RW;
break;
case '3': /* read watchpoint */
wtype |= _DEBUG_BREAK_RD;
break;
case '4': /* access watchpoint */
wtype |= _DEBUG_BREAK_RW;
break;
default:
return 1; /* Not supported. */
}
return nto_breakpoint (addr, wtype, -1);
}
/* Check if the reason of stop for current thread (CURRENT_INFERIOR) is
a watchpoint.
Return 1 if stopped by watchpoint, 0 otherwise. */
static int
nto_stopped_by_watchpoint (void)
{
int ret = 0;
TRACE ("%s\n", __func__);
if (nto_inferior.ctl_fd != -1 && current_inferior != NULL)
{
ptid_t ptid;
ptid = thread_to_gdb_id (current_inferior);
if (nto_set_thread (ptid))
{
const int watchmask = _DEBUG_FLAG_TRACE_RD | _DEBUG_FLAG_TRACE_WR
| _DEBUG_FLAG_TRACE_MODIFY;
procfs_status status;
int err;
err = devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status,
sizeof (status), 0);
if (err == EOK && (status.flags & watchmask))
ret = 1;
}
}
TRACE ("%s: %s\n", __func__, ret ? "yes" : "no");
return ret;
}
/* Get instruction pointer for CURRENT_INFERIOR thread.
Return inferior's instruction pointer value, or 0 on error. */
static CORE_ADDR
nto_stopped_data_address (void)
{
CORE_ADDR ret = (CORE_ADDR)0;
TRACE ("%s\n", __func__);
if (nto_inferior.ctl_fd != -1 && current_inferior != NULL)
{
ptid_t ptid;
ptid = thread_to_gdb_id (current_inferior);
if (nto_set_thread (ptid))
{
procfs_status status;
if (devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status,
sizeof (status), 0) == EOK)
ret = status.ip;
}
}
TRACE ("%s: 0x%08lx\n", __func__, ret);
return ret;
}
/* We do not currently support non-stop. */
static int
nto_supports_non_stop (void)
{
TRACE ("%s\n", __func__);
return 0;
}
static struct target_ops nto_target_ops = {
nto_create_inferior,
nto_attach,
nto_kill,
nto_detach,
nto_mourn,
NULL, /* nto_join */
nto_thread_alive,
nto_resume,
nto_wait,
nto_fetch_registers,
nto_store_registers,
NULL, /* prepare_to_access_memory */
NULL, /* done_accessing_memory */
nto_read_memory,
nto_write_memory,
NULL, /* nto_look_up_symbols */
nto_request_interrupt,
nto_read_auxv,
nto_insert_point,
nto_remove_point,
nto_stopped_by_watchpoint,
nto_stopped_data_address,
NULL, /* nto_read_offsets */
NULL, /* thread_db_set_tls_address */
NULL,
hostio_last_error_from_errno,
NULL, /* nto_qxfer_osdata */
NULL, /* xfer_siginfo */
nto_supports_non_stop,
NULL, /* async */
NULL /* start_non_stop */
};
/* Global function called by server.c. Initializes QNX Neutrino
gdbserver. */
void
initialize_low (void)
{
sigset_t set;
TRACE ("%s\n", __func__);
set_target_ops (&nto_target_ops);
set_breakpoint_data (the_low_target.breakpoint,
the_low_target.breakpoint_len);
/* We use SIGUSR1 to gain control after we block waiting for a process.
We use sigwaitevent to wait. */
sigemptyset (&set);
sigaddset (&set, SIGUSR1);
sigprocmask (SIG_BLOCK, &set, NULL);
}
|