forked from gbenson/binutils-gdb
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathwindows-nat.c
2856 lines (2509 loc) · 82 KB
/
windows-nat.c
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
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* Target-vector operations for controlling windows child processes, for GDB.
Copyright (C) 1995-2015 Free Software Foundation, Inc.
Contributed by Cygnus Solutions, A Red Hat Company.
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/>. */
/* Originally by Steve Chamberlain, [email protected] */
#include "defs.h"
#include "frame.h" /* required by inferior.h */
#include "inferior.h"
#include "infrun.h"
#include "target.h"
#include "gdbcore.h"
#include "command.h"
#include "completer.h"
#include "regcache.h"
#include "top.h"
#include <signal.h>
#include <sys/types.h>
#include <fcntl.h>
#include <windows.h>
#include <imagehlp.h>
#include <psapi.h>
#ifdef __CYGWIN__
#include <wchar.h>
#include <sys/cygwin.h>
#include <cygwin/version.h>
#endif
#include "buildsym.h"
#include "filenames.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdb_bfd.h"
#include "gdb_obstack.h"
#include "gdbthread.h"
#include "gdbcmd.h"
#include <unistd.h>
#include "exec.h"
#include "solist.h"
#include "solib.h"
#include "xml-support.h"
#include "i386-tdep.h"
#include "i387-tdep.h"
#include "windows-tdep.h"
#include "windows-nat.h"
#include "x86-nat.h"
#include "complaints.h"
#include "inf-child.h"
#define AdjustTokenPrivileges dyn_AdjustTokenPrivileges
#define DebugActiveProcessStop dyn_DebugActiveProcessStop
#define DebugBreakProcess dyn_DebugBreakProcess
#define DebugSetProcessKillOnExit dyn_DebugSetProcessKillOnExit
#define EnumProcessModules dyn_EnumProcessModules
#define GetModuleInformation dyn_GetModuleInformation
#define LookupPrivilegeValueA dyn_LookupPrivilegeValueA
#define OpenProcessToken dyn_OpenProcessToken
#define GetConsoleFontSize dyn_GetConsoleFontSize
#define GetCurrentConsoleFont dyn_GetCurrentConsoleFont
static BOOL WINAPI (*AdjustTokenPrivileges)(HANDLE, BOOL, PTOKEN_PRIVILEGES,
DWORD, PTOKEN_PRIVILEGES, PDWORD);
static BOOL WINAPI (*DebugActiveProcessStop) (DWORD);
static BOOL WINAPI (*DebugBreakProcess) (HANDLE);
static BOOL WINAPI (*DebugSetProcessKillOnExit) (BOOL);
static BOOL WINAPI (*EnumProcessModules) (HANDLE, HMODULE *, DWORD,
LPDWORD);
static BOOL WINAPI (*GetModuleInformation) (HANDLE, HMODULE, LPMODULEINFO,
DWORD);
static BOOL WINAPI (*LookupPrivilegeValueA)(LPCSTR, LPCSTR, PLUID);
static BOOL WINAPI (*OpenProcessToken)(HANDLE, DWORD, PHANDLE);
static BOOL WINAPI (*GetCurrentConsoleFont) (HANDLE, BOOL,
CONSOLE_FONT_INFO *);
static COORD WINAPI (*GetConsoleFontSize) (HANDLE, DWORD);
#undef STARTUPINFO
#undef CreateProcess
#undef GetModuleFileNameEx
#ifndef __CYGWIN__
# define __PMAX (MAX_PATH + 1)
static DWORD WINAPI (*GetModuleFileNameEx) (HANDLE, HMODULE, LPSTR, DWORD);
# define STARTUPINFO STARTUPINFOA
# define CreateProcess CreateProcessA
# define GetModuleFileNameEx_name "GetModuleFileNameExA"
# define bad_GetModuleFileNameEx bad_GetModuleFileNameExA
#else
# define __PMAX PATH_MAX
/* The starting and ending address of the cygwin1.dll text segment. */
static CORE_ADDR cygwin_load_start;
static CORE_ADDR cygwin_load_end;
# define __USEWIDE
typedef wchar_t cygwin_buf_t;
static DWORD WINAPI (*GetModuleFileNameEx) (HANDLE, HMODULE,
LPWSTR, DWORD);
# define STARTUPINFO STARTUPINFOW
# define CreateProcess CreateProcessW
# define GetModuleFileNameEx_name "GetModuleFileNameExW"
# define bad_GetModuleFileNameEx bad_GetModuleFileNameExW
#endif
static int have_saved_context; /* True if we've saved context from a
cygwin signal. */
static CONTEXT saved_context; /* Containes the saved context from a
cygwin signal. */
/* If we're not using the old Cygwin header file set, define the
following which never should have been in the generic Win32 API
headers in the first place since they were our own invention... */
#ifndef _GNU_H_WINDOWS_H
enum
{
FLAG_TRACE_BIT = 0x100,
};
#endif
#ifndef CONTEXT_EXTENDED_REGISTERS
/* This macro is only defined on ia32. It only makes sense on this target,
so define it as zero if not already defined. */
#define CONTEXT_EXTENDED_REGISTERS 0
#endif
#define CONTEXT_DEBUGGER_DR CONTEXT_FULL | CONTEXT_FLOATING_POINT \
| CONTEXT_SEGMENTS | CONTEXT_DEBUG_REGISTERS \
| CONTEXT_EXTENDED_REGISTERS
static uintptr_t dr[8];
static int debug_registers_changed;
static int debug_registers_used;
static int windows_initialization_done;
#define DR6_CLEAR_VALUE 0xffff0ff0
/* The string sent by cygwin when it processes a signal.
FIXME: This should be in a cygwin include file. */
#ifndef _CYGWIN_SIGNAL_STRING
#define _CYGWIN_SIGNAL_STRING "cYgSiGw00f"
#endif
#define CHECK(x) check (x, __FILE__,__LINE__)
#define DEBUG_EXEC(x) if (debug_exec) printf_unfiltered x
#define DEBUG_EVENTS(x) if (debug_events) printf_unfiltered x
#define DEBUG_MEM(x) if (debug_memory) printf_unfiltered x
#define DEBUG_EXCEPT(x) if (debug_exceptions) printf_unfiltered x
static void windows_interrupt (struct target_ops *self, ptid_t);
static int windows_thread_alive (struct target_ops *, ptid_t);
static void windows_kill_inferior (struct target_ops *);
static void cygwin_set_dr (int i, CORE_ADDR addr);
static void cygwin_set_dr7 (unsigned long val);
static CORE_ADDR cygwin_get_dr (int i);
static unsigned long cygwin_get_dr6 (void);
static unsigned long cygwin_get_dr7 (void);
static enum gdb_signal last_sig = GDB_SIGNAL_0;
/* Set if a signal was received from the debugged process. */
/* Thread information structure used to track information that is
not available in gdb's thread structure. */
typedef struct windows_thread_info_struct
{
struct windows_thread_info_struct *next;
DWORD id;
HANDLE h;
CORE_ADDR thread_local_base;
char *name;
int suspended;
int reload_context;
CONTEXT context;
STACKFRAME sf;
}
windows_thread_info;
static windows_thread_info thread_head;
/* The process and thread handles for the above context. */
static DEBUG_EVENT current_event; /* The current debug event from
WaitForDebugEvent */
static HANDLE current_process_handle; /* Currently executing process */
static windows_thread_info *current_thread; /* Info on currently selected thread */
static DWORD main_thread_id; /* Thread ID of the main thread */
/* Counts of things. */
static int exception_count = 0;
static int event_count = 0;
static int saw_create;
static int open_process_used = 0;
/* User options. */
static int new_console = 0;
#ifdef __CYGWIN__
static int cygwin_exceptions = 0;
#endif
static int new_group = 1;
static int debug_exec = 0; /* show execution */
static int debug_events = 0; /* show events from kernel */
static int debug_memory = 0; /* show target memory accesses */
static int debug_exceptions = 0; /* show target exceptions */
static int useshell = 0; /* use shell for subprocesses */
/* This vector maps GDB's idea of a register's number into an offset
in the windows exception context vector.
It also contains the bit mask needed to load the register in question.
The contents of this table can only be computed by the units
that provide CPU-specific support for Windows native debugging.
These units should set the table by calling
windows_set_context_register_offsets.
One day we could read a reg, we could inspect the context we
already have loaded, if it doesn't have the bit set that we need,
we read that set of registers in using GetThreadContext. If the
context already contains what we need, we just unpack it. Then to
write a register, first we have to ensure that the context contains
the other regs of the group, and then we copy the info in and set
out bit. */
static const int *mappings;
/* The function to use in order to determine whether a register is
a segment register or not. */
static segment_register_p_ftype *segment_register_p;
/* This vector maps the target's idea of an exception (extracted
from the DEBUG_EVENT structure) to GDB's idea. */
struct xlate_exception
{
int them;
enum gdb_signal us;
};
static const struct xlate_exception
xlate[] =
{
{EXCEPTION_ACCESS_VIOLATION, GDB_SIGNAL_SEGV},
{STATUS_STACK_OVERFLOW, GDB_SIGNAL_SEGV},
{EXCEPTION_BREAKPOINT, GDB_SIGNAL_TRAP},
{DBG_CONTROL_C, GDB_SIGNAL_INT},
{EXCEPTION_SINGLE_STEP, GDB_SIGNAL_TRAP},
{STATUS_FLOAT_DIVIDE_BY_ZERO, GDB_SIGNAL_FPE},
{-1, -1}};
/* Set the MAPPINGS static global to OFFSETS.
See the description of MAPPINGS for more details. */
void
windows_set_context_register_offsets (const int *offsets)
{
mappings = offsets;
}
/* See windows-nat.h. */
void
windows_set_segment_register_p (segment_register_p_ftype *fun)
{
segment_register_p = fun;
}
static void
check (BOOL ok, const char *file, int line)
{
if (!ok)
printf_filtered ("error return %s:%d was %u\n", file, line,
(unsigned) GetLastError ());
}
/* Find a thread record given a thread id. If GET_CONTEXT is not 0,
then also retrieve the context for this thread. If GET_CONTEXT is
negative, then don't suspend the thread. */
static windows_thread_info *
thread_rec (DWORD id, int get_context)
{
windows_thread_info *th;
for (th = &thread_head; (th = th->next) != NULL;)
if (th->id == id)
{
if (!th->suspended && get_context)
{
if (get_context > 0 && id != current_event.dwThreadId)
{
if (SuspendThread (th->h) == (DWORD) -1)
{
DWORD err = GetLastError ();
/* We get Access Denied (5) when trying to suspend
threads that Windows started on behalf of the
debuggee, usually when those threads are just
about to exit.
We can get Invalid Handle (6) if the main thread
has exited. */
if (err != ERROR_INVALID_HANDLE
&& err != ERROR_ACCESS_DENIED)
warning (_("SuspendThread (tid=0x%x) failed."
" (winerr %u)"),
(unsigned) id, (unsigned) err);
th->suspended = -1;
}
else
th->suspended = 1;
}
else if (get_context < 0)
th->suspended = -1;
th->reload_context = 1;
}
return th;
}
return NULL;
}
/* Add a thread to the thread list. */
static windows_thread_info *
windows_add_thread (ptid_t ptid, HANDLE h, void *tlb)
{
windows_thread_info *th;
DWORD id;
gdb_assert (ptid_get_tid (ptid) != 0);
id = ptid_get_tid (ptid);
if ((th = thread_rec (id, FALSE)))
return th;
th = XCNEW (windows_thread_info);
th->id = id;
th->h = h;
th->thread_local_base = (CORE_ADDR) (uintptr_t) tlb;
th->next = thread_head.next;
thread_head.next = th;
add_thread (ptid);
/* Set the debug registers for the new thread if they are used. */
if (debug_registers_used)
{
/* Only change the value of the debug registers. */
th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
CHECK (GetThreadContext (th->h, &th->context));
th->context.Dr0 = dr[0];
th->context.Dr1 = dr[1];
th->context.Dr2 = dr[2];
th->context.Dr3 = dr[3];
th->context.Dr6 = DR6_CLEAR_VALUE;
th->context.Dr7 = dr[7];
CHECK (SetThreadContext (th->h, &th->context));
th->context.ContextFlags = 0;
}
return th;
}
/* Clear out any old thread list and reintialize it to a
pristine state. */
static void
windows_init_thread_list (void)
{
windows_thread_info *th = &thread_head;
DEBUG_EVENTS (("gdb: windows_init_thread_list\n"));
init_thread_list ();
while (th->next != NULL)
{
windows_thread_info *here = th->next;
th->next = here->next;
xfree (here);
}
thread_head.next = NULL;
}
/* Delete a thread from the list of threads. */
static void
windows_delete_thread (ptid_t ptid, DWORD exit_code)
{
windows_thread_info *th;
DWORD id;
gdb_assert (ptid_get_tid (ptid) != 0);
id = ptid_get_tid (ptid);
if (info_verbose)
printf_unfiltered ("[Deleting %s]\n", target_pid_to_str (ptid));
else if (print_thread_events && id != main_thread_id)
printf_unfiltered (_("[%s exited with code %u]\n"),
target_pid_to_str (ptid), (unsigned) exit_code);
delete_thread (ptid);
for (th = &thread_head;
th->next != NULL && th->next->id != id;
th = th->next)
continue;
if (th->next != NULL)
{
windows_thread_info *here = th->next;
th->next = here->next;
xfree (here);
}
}
static void
do_windows_fetch_inferior_registers (struct regcache *regcache, int r)
{
char *context_offset = ((char *) ¤t_thread->context) + mappings[r];
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
long l;
if (!current_thread)
return; /* Windows sometimes uses a non-existent thread id in its
events. */
if (current_thread->reload_context)
{
#ifdef __CYGWIN__
if (have_saved_context)
{
/* Lie about where the program actually is stopped since
cygwin has informed us that we should consider the signal
to have occurred at another location which is stored in
"saved_context. */
memcpy (¤t_thread->context, &saved_context,
__COPY_CONTEXT_SIZE);
have_saved_context = 0;
}
else
#endif
{
windows_thread_info *th = current_thread;
th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
CHECK (GetThreadContext (th->h, &th->context));
/* Copy dr values from that thread.
But only if there were not modified since last stop.
PR gdb/2388 */
if (!debug_registers_changed)
{
dr[0] = th->context.Dr0;
dr[1] = th->context.Dr1;
dr[2] = th->context.Dr2;
dr[3] = th->context.Dr3;
dr[6] = th->context.Dr6;
dr[7] = th->context.Dr7;
}
}
current_thread->reload_context = 0;
}
if (r == I387_FISEG_REGNUM (tdep))
{
l = *((long *) context_offset) & 0xffff;
regcache_raw_supply (regcache, r, (char *) &l);
}
else if (r == I387_FOP_REGNUM (tdep))
{
l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
regcache_raw_supply (regcache, r, (char *) &l);
}
else if (segment_register_p (r))
{
/* GDB treats segment registers as 32bit registers, but they are
in fact only 16 bits long. Make sure we do not read extra
bits from our source buffer. */
l = *((long *) context_offset) & 0xffff;
regcache_raw_supply (regcache, r, (char *) &l);
}
else if (r >= 0)
regcache_raw_supply (regcache, r, context_offset);
else
{
for (r = 0; r < gdbarch_num_regs (gdbarch); r++)
do_windows_fetch_inferior_registers (regcache, r);
}
}
static void
windows_fetch_inferior_registers (struct target_ops *ops,
struct regcache *regcache, int r)
{
current_thread = thread_rec (ptid_get_tid (inferior_ptid), TRUE);
/* Check if current_thread exists. Windows sometimes uses a non-existent
thread id in its events. */
if (current_thread)
do_windows_fetch_inferior_registers (regcache, r);
}
static void
do_windows_store_inferior_registers (const struct regcache *regcache, int r)
{
if (!current_thread)
/* Windows sometimes uses a non-existent thread id in its events. */;
else if (r >= 0)
regcache_raw_collect (regcache, r,
((char *) ¤t_thread->context) + mappings[r]);
else
{
for (r = 0; r < gdbarch_num_regs (get_regcache_arch (regcache)); r++)
do_windows_store_inferior_registers (regcache, r);
}
}
/* Store a new register value into the current thread context. */
static void
windows_store_inferior_registers (struct target_ops *ops,
struct regcache *regcache, int r)
{
current_thread = thread_rec (ptid_get_tid (inferior_ptid), TRUE);
/* Check if current_thread exists. Windows sometimes uses a non-existent
thread id in its events. */
if (current_thread)
do_windows_store_inferior_registers (regcache, r);
}
/* Encapsulate the information required in a call to
symbol_file_add_args. */
struct safe_symbol_file_add_args
{
char *name;
int from_tty;
struct section_addr_info *addrs;
int mainline;
int flags;
struct ui_file *err, *out;
struct objfile *ret;
};
/* Maintain a linked list of "so" information. */
struct lm_info
{
LPVOID load_addr;
};
static struct so_list solib_start, *solib_end;
static struct so_list *
windows_make_so (const char *name, LPVOID load_addr)
{
struct so_list *so;
char *p;
#ifndef __CYGWIN__
char buf[__PMAX];
char cwd[__PMAX];
WIN32_FIND_DATA w32_fd;
HANDLE h = FindFirstFile(name, &w32_fd);
if (h == INVALID_HANDLE_VALUE)
strcpy (buf, name);
else
{
FindClose (h);
strcpy (buf, name);
if (GetCurrentDirectory (MAX_PATH + 1, cwd))
{
p = strrchr (buf, '\\');
if (p)
p[1] = '\0';
SetCurrentDirectory (buf);
GetFullPathName (w32_fd.cFileName, MAX_PATH, buf, &p);
SetCurrentDirectory (cwd);
}
}
if (strcasecmp (buf, "ntdll.dll") == 0)
{
GetSystemDirectory (buf, sizeof (buf));
strcat (buf, "\\ntdll.dll");
}
#else
cygwin_buf_t buf[__PMAX];
buf[0] = 0;
if (access (name, F_OK) != 0)
{
if (strcasecmp (name, "ntdll.dll") == 0)
#ifdef __USEWIDE
{
GetSystemDirectoryW (buf, sizeof (buf) / sizeof (wchar_t));
wcscat (buf, L"\\ntdll.dll");
}
#else
{
GetSystemDirectoryA (buf, sizeof (buf) / sizeof (wchar_t));
strcat (buf, "\\ntdll.dll");
}
#endif
}
#endif
so = XCNEW (struct so_list);
so->lm_info = XNEW (struct lm_info);
so->lm_info->load_addr = load_addr;
strcpy (so->so_original_name, name);
#ifndef __CYGWIN__
strcpy (so->so_name, buf);
#else
if (buf[0])
cygwin_conv_path (CCP_WIN_W_TO_POSIX, buf, so->so_name,
SO_NAME_MAX_PATH_SIZE);
else
{
char *rname = realpath (name, NULL);
if (rname && strlen (rname) < SO_NAME_MAX_PATH_SIZE)
{
strcpy (so->so_name, rname);
free (rname);
}
else
error (_("dll path too long"));
}
/* Record cygwin1.dll .text start/end. */
p = strchr (so->so_name, '\0') - (sizeof ("/cygwin1.dll") - 1);
if (p >= so->so_name && strcasecmp (p, "/cygwin1.dll") == 0)
{
bfd *abfd;
asection *text = NULL;
CORE_ADDR text_vma;
abfd = gdb_bfd_open (so->so_name, "pei-i386", -1);
if (!abfd)
return so;
if (bfd_check_format (abfd, bfd_object))
text = bfd_get_section_by_name (abfd, ".text");
if (!text)
{
gdb_bfd_unref (abfd);
return so;
}
/* The symbols in a dll are offset by 0x1000, which is the
offset from 0 of the first byte in an image - because of the
file header and the section alignment. */
cygwin_load_start = (CORE_ADDR) (uintptr_t) ((char *)
load_addr + 0x1000);
cygwin_load_end = cygwin_load_start + bfd_section_size (abfd, text);
gdb_bfd_unref (abfd);
}
#endif
return so;
}
static char *
get_image_name (HANDLE h, void *address, int unicode)
{
#ifdef __CYGWIN__
static char buf[__PMAX];
#else
static char buf[(2 * __PMAX) + 1];
#endif
DWORD size = unicode ? sizeof (WCHAR) : sizeof (char);
char *address_ptr;
int len = 0;
char b[2];
SIZE_T done;
/* Attempt to read the name of the dll that was detected.
This is documented to work only when actively debugging
a program. It will not work for attached processes. */
if (address == NULL)
return NULL;
/* See if we could read the address of a string, and that the
address isn't null. */
if (!ReadProcessMemory (h, address, &address_ptr,
sizeof (address_ptr), &done)
|| done != sizeof (address_ptr) || !address_ptr)
return NULL;
/* Find the length of the string. */
while (ReadProcessMemory (h, address_ptr + len++ * size, &b, size, &done)
&& (b[0] != 0 || b[size - 1] != 0) && done == size)
continue;
if (!unicode)
ReadProcessMemory (h, address_ptr, buf, len, &done);
else
{
WCHAR *unicode_address = (WCHAR *) alloca (len * sizeof (WCHAR));
ReadProcessMemory (h, address_ptr, unicode_address, len * sizeof (WCHAR),
&done);
#ifdef __CYGWIN__
wcstombs (buf, unicode_address, __PMAX);
#else
WideCharToMultiByte (CP_ACP, 0, unicode_address, len, buf, sizeof buf,
0, 0);
#endif
}
return buf;
}
/* Handle a DLL load event, and return 1.
This function assumes that this event did not occur during inferior
initialization, where their event info may be incomplete (see
do_initial_windows_stuff and windows_add_all_dlls for more info
on how we handle DLL loading during that phase). */
static int
handle_load_dll (void *dummy)
{
LOAD_DLL_DEBUG_INFO *event = ¤t_event.u.LoadDll;
char *dll_name;
/* Try getting the DLL name via the lpImageName field of the event.
Note that Microsoft documents this fields as strictly optional,
in the sense that it might be NULL. And the first DLL event in
particular is explicitly documented as "likely not pass[ed]"
(source: MSDN LOAD_DLL_DEBUG_INFO structure). */
dll_name = get_image_name (current_process_handle,
event->lpImageName, event->fUnicode);
if (!dll_name)
return 1;
solib_end->next = windows_make_so (dll_name, event->lpBaseOfDll);
solib_end = solib_end->next;
DEBUG_EVENTS (("gdb: Loading dll \"%s\" at %s.\n", solib_end->so_name,
host_address_to_string (solib_end->lm_info->load_addr)));
return 1;
}
static void
windows_free_so (struct so_list *so)
{
if (so->lm_info)
xfree (so->lm_info);
xfree (so);
}
/* Handle a DLL unload event.
Return 1 if successful, or zero otherwise.
This function assumes that this event did not occur during inferior
initialization, where their event info may be incomplete (see
do_initial_windows_stuff and windows_add_all_dlls for more info
on how we handle DLL loading during that phase). */
static int
handle_unload_dll (void *dummy)
{
LPVOID lpBaseOfDll = current_event.u.UnloadDll.lpBaseOfDll;
struct so_list *so;
for (so = &solib_start; so->next != NULL; so = so->next)
if (so->next->lm_info->load_addr == lpBaseOfDll)
{
struct so_list *sodel = so->next;
so->next = sodel->next;
if (!so->next)
solib_end = so;
DEBUG_EVENTS (("gdb: Unloading dll \"%s\".\n", sodel->so_name));
windows_free_so (sodel);
return 1;
}
/* We did not find any DLL that was previously loaded at this address,
so register a complaint. We do not report an error, because we have
observed that this may be happening under some circumstances. For
instance, running 32bit applications on x64 Windows causes us to receive
4 mysterious UNLOAD_DLL_DEBUG_EVENTs during the startup phase (these
events are apparently caused by the WOW layer, the interface between
32bit and 64bit worlds). */
complaint (&symfile_complaints, _("dll starting at %s not found."),
host_address_to_string (lpBaseOfDll));
return 0;
}
/* Clear list of loaded DLLs. */
static void
windows_clear_solib (void)
{
solib_start.next = NULL;
solib_end = &solib_start;
}
/* Handle DEBUG_STRING output from child process.
Cygwin prepends its messages with a "cygwin:". Interpret this as
a Cygwin signal. Otherwise just print the string as a warning. */
static int
handle_output_debug_string (struct target_waitstatus *ourstatus)
{
char *s = NULL;
int retval = 0;
if (!target_read_string
((CORE_ADDR) (uintptr_t) current_event.u.DebugString.lpDebugStringData,
&s, 1024, 0)
|| !s || !*s)
/* nothing to do */;
else if (!startswith (s, _CYGWIN_SIGNAL_STRING))
{
#ifdef __CYGWIN__
if (!startswith (s, "cYg"))
#endif
{
char *p = strchr (s, '\0');
if (p > s && *--p == '\n')
*p = '\0';
warning (("%s"), s);
}
}
#ifdef __CYGWIN__
else
{
/* Got a cygwin signal marker. A cygwin signal is followed by
the signal number itself and then optionally followed by the
thread id and address to saved context within the DLL. If
these are supplied, then the given thread is assumed to have
issued the signal and the context from the thread is assumed
to be stored at the given address in the inferior. Tell gdb
to treat this like a real signal. */
char *p;
int sig = strtol (s + sizeof (_CYGWIN_SIGNAL_STRING) - 1, &p, 0);
int gotasig = gdb_signal_from_host (sig);
ourstatus->value.sig = gotasig;
if (gotasig)
{
LPCVOID x;
SIZE_T n;
ourstatus->kind = TARGET_WAITKIND_STOPPED;
retval = strtoul (p, &p, 0);
if (!retval)
retval = main_thread_id;
else if ((x = (LPCVOID) (uintptr_t) strtoull (p, NULL, 0))
&& ReadProcessMemory (current_process_handle, x,
&saved_context,
__COPY_CONTEXT_SIZE, &n)
&& n == __COPY_CONTEXT_SIZE)
have_saved_context = 1;
}
}
#endif
if (s)
xfree (s);
return retval;
}
static int
display_selector (HANDLE thread, DWORD sel)
{
LDT_ENTRY info;
if (GetThreadSelectorEntry (thread, sel, &info))
{
int base, limit;
printf_filtered ("0x%03x: ", (unsigned) sel);
if (!info.HighWord.Bits.Pres)
{
puts_filtered ("Segment not present\n");
return 0;
}
base = (info.HighWord.Bits.BaseHi << 24) +
(info.HighWord.Bits.BaseMid << 16)
+ info.BaseLow;
limit = (info.HighWord.Bits.LimitHi << 16) + info.LimitLow;
if (info.HighWord.Bits.Granularity)
limit = (limit << 12) | 0xfff;
printf_filtered ("base=0x%08x limit=0x%08x", base, limit);
if (info.HighWord.Bits.Default_Big)
puts_filtered(" 32-bit ");
else
puts_filtered(" 16-bit ");
switch ((info.HighWord.Bits.Type & 0xf) >> 1)
{
case 0:
puts_filtered ("Data (Read-Only, Exp-up");
break;
case 1:
puts_filtered ("Data (Read/Write, Exp-up");
break;
case 2:
puts_filtered ("Unused segment (");
break;
case 3:
puts_filtered ("Data (Read/Write, Exp-down");
break;
case 4:
puts_filtered ("Code (Exec-Only, N.Conf");
break;
case 5:
puts_filtered ("Code (Exec/Read, N.Conf");
break;
case 6:
puts_filtered ("Code (Exec-Only, Conf");
break;
case 7:
puts_filtered ("Code (Exec/Read, Conf");
break;
default:
printf_filtered ("Unknown type 0x%x",info.HighWord.Bits.Type);
}
if ((info.HighWord.Bits.Type & 0x1) == 0)
puts_filtered(", N.Acc");
puts_filtered (")\n");
if ((info.HighWord.Bits.Type & 0x10) == 0)
puts_filtered("System selector ");
printf_filtered ("Priviledge level = %d. ", info.HighWord.Bits.Dpl);
if (info.HighWord.Bits.Granularity)
puts_filtered ("Page granular.\n");
else
puts_filtered ("Byte granular.\n");
return 1;
}
else
{
DWORD err = GetLastError ();
if (err == ERROR_NOT_SUPPORTED)
printf_filtered ("Function not supported\n");
else
printf_filtered ("Invalid selector 0x%x.\n", (unsigned) sel);
return 0;
}
}
static void
display_selectors (char * args, int from_tty)
{
if (!current_thread)
{
puts_filtered ("Impossible to display selectors now.\n");
return;
}
if (!args)
{
puts_filtered ("Selector $cs\n");
display_selector (current_thread->h,
current_thread->context.SegCs);
puts_filtered ("Selector $ds\n");
display_selector (current_thread->h,
current_thread->context.SegDs);
puts_filtered ("Selector $es\n");
display_selector (current_thread->h,
current_thread->context.SegEs);
puts_filtered ("Selector $ss\n");
display_selector (current_thread->h,
current_thread->context.SegSs);
puts_filtered ("Selector $fs\n");
display_selector (current_thread->h,
current_thread->context.SegFs);
puts_filtered ("Selector $gs\n");
display_selector (current_thread->h,
current_thread->context.SegGs);
}
else
{
int sel;
sel = parse_and_eval_long (args);
printf_filtered ("Selector \"%s\"\n",args);
display_selector (current_thread->h, sel);
}
}
#define DEBUG_EXCEPTION_SIMPLE(x) if (debug_exceptions) \
printf_unfiltered ("gdb: Target exception %s at %s\n", x, \
host_address_to_string (\
current_event.u.Exception.ExceptionRecord.ExceptionAddress))
static int
handle_exception (struct target_waitstatus *ourstatus)
{
windows_thread_info *th;
DWORD code = current_event.u.Exception.ExceptionRecord.ExceptionCode;
ourstatus->kind = TARGET_WAITKIND_STOPPED;
/* Record the context of the current thread. */
th = thread_rec (current_event.dwThreadId, -1);