-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathgdbstub.c
2083 lines (1904 loc) · 54.2 KB
/
gdbstub.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
/*
* gdb server stub
*
* Copyright (c) 2003-2005 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/cutils.h"
#include "cpu.h"
#include "trace-root.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
#else
#include "monitor/monitor.h"
#include "chardev/char.h"
#include "chardev/char-fe.h"
#include "sysemu/sysemu.h"
#include "exec/gdbstub.h"
#endif
#define MAX_PACKET_LENGTH 4096
#include "qemu/sockets.h"
#include "sysemu/hw_accel.h"
#include "sysemu/kvm.h"
#include "exec/semihost.h"
#include "exec/exec-all.h"
#ifdef CONFIG_USER_ONLY
#define GDB_ATTACHED "0"
#else
#define GDB_ATTACHED "1"
#endif
static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
uint8_t *buf, int len, bool is_write)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
if (cc->memory_rw_debug) {
return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
}
return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
}
/* Return the GDB index for a given vCPU state.
*
* For user mode this is simply the thread id. In system mode GDB
* numbers CPUs from 1 as 0 is reserved as an "any cpu" index.
*/
static inline int cpu_gdb_index(CPUState *cpu)
{
#if defined(CONFIG_USER_ONLY)
TaskState *ts = (TaskState *) cpu->opaque;
return ts->ts_tid;
#else
return cpu->cpu_index + 1;
#endif
}
enum {
GDB_SIGNAL_0 = 0,
GDB_SIGNAL_INT = 2,
GDB_SIGNAL_QUIT = 3,
GDB_SIGNAL_TRAP = 5,
GDB_SIGNAL_ABRT = 6,
GDB_SIGNAL_ALRM = 14,
GDB_SIGNAL_IO = 23,
GDB_SIGNAL_XCPU = 24,
GDB_SIGNAL_UNKNOWN = 143
};
#ifdef CONFIG_USER_ONLY
/* Map target signal numbers to GDB protocol signal numbers and vice
* versa. For user emulation's currently supported systems, we can
* assume most signals are defined.
*/
static int gdb_signal_table[] = {
0,
TARGET_SIGHUP,
TARGET_SIGINT,
TARGET_SIGQUIT,
TARGET_SIGILL,
TARGET_SIGTRAP,
TARGET_SIGABRT,
-1, /* SIGEMT */
TARGET_SIGFPE,
TARGET_SIGKILL,
TARGET_SIGBUS,
TARGET_SIGSEGV,
TARGET_SIGSYS,
TARGET_SIGPIPE,
TARGET_SIGALRM,
TARGET_SIGTERM,
TARGET_SIGURG,
TARGET_SIGSTOP,
TARGET_SIGTSTP,
TARGET_SIGCONT,
TARGET_SIGCHLD,
TARGET_SIGTTIN,
TARGET_SIGTTOU,
TARGET_SIGIO,
TARGET_SIGXCPU,
TARGET_SIGXFSZ,
TARGET_SIGVTALRM,
TARGET_SIGPROF,
TARGET_SIGWINCH,
-1, /* SIGLOST */
TARGET_SIGUSR1,
TARGET_SIGUSR2,
#ifdef TARGET_SIGPWR
TARGET_SIGPWR,
#else
-1,
#endif
-1, /* SIGPOLL */
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
#ifdef __SIGRTMIN
__SIGRTMIN + 1,
__SIGRTMIN + 2,
__SIGRTMIN + 3,
__SIGRTMIN + 4,
__SIGRTMIN + 5,
__SIGRTMIN + 6,
__SIGRTMIN + 7,
__SIGRTMIN + 8,
__SIGRTMIN + 9,
__SIGRTMIN + 10,
__SIGRTMIN + 11,
__SIGRTMIN + 12,
__SIGRTMIN + 13,
__SIGRTMIN + 14,
__SIGRTMIN + 15,
__SIGRTMIN + 16,
__SIGRTMIN + 17,
__SIGRTMIN + 18,
__SIGRTMIN + 19,
__SIGRTMIN + 20,
__SIGRTMIN + 21,
__SIGRTMIN + 22,
__SIGRTMIN + 23,
__SIGRTMIN + 24,
__SIGRTMIN + 25,
__SIGRTMIN + 26,
__SIGRTMIN + 27,
__SIGRTMIN + 28,
__SIGRTMIN + 29,
__SIGRTMIN + 30,
__SIGRTMIN + 31,
-1, /* SIGCANCEL */
__SIGRTMIN,
__SIGRTMIN + 32,
__SIGRTMIN + 33,
__SIGRTMIN + 34,
__SIGRTMIN + 35,
__SIGRTMIN + 36,
__SIGRTMIN + 37,
__SIGRTMIN + 38,
__SIGRTMIN + 39,
__SIGRTMIN + 40,
__SIGRTMIN + 41,
__SIGRTMIN + 42,
__SIGRTMIN + 43,
__SIGRTMIN + 44,
__SIGRTMIN + 45,
__SIGRTMIN + 46,
__SIGRTMIN + 47,
__SIGRTMIN + 48,
__SIGRTMIN + 49,
__SIGRTMIN + 50,
__SIGRTMIN + 51,
__SIGRTMIN + 52,
__SIGRTMIN + 53,
__SIGRTMIN + 54,
__SIGRTMIN + 55,
__SIGRTMIN + 56,
__SIGRTMIN + 57,
__SIGRTMIN + 58,
__SIGRTMIN + 59,
__SIGRTMIN + 60,
__SIGRTMIN + 61,
__SIGRTMIN + 62,
__SIGRTMIN + 63,
__SIGRTMIN + 64,
__SIGRTMIN + 65,
__SIGRTMIN + 66,
__SIGRTMIN + 67,
__SIGRTMIN + 68,
__SIGRTMIN + 69,
__SIGRTMIN + 70,
__SIGRTMIN + 71,
__SIGRTMIN + 72,
__SIGRTMIN + 73,
__SIGRTMIN + 74,
__SIGRTMIN + 75,
__SIGRTMIN + 76,
__SIGRTMIN + 77,
__SIGRTMIN + 78,
__SIGRTMIN + 79,
__SIGRTMIN + 80,
__SIGRTMIN + 81,
__SIGRTMIN + 82,
__SIGRTMIN + 83,
__SIGRTMIN + 84,
__SIGRTMIN + 85,
__SIGRTMIN + 86,
__SIGRTMIN + 87,
__SIGRTMIN + 88,
__SIGRTMIN + 89,
__SIGRTMIN + 90,
__SIGRTMIN + 91,
__SIGRTMIN + 92,
__SIGRTMIN + 93,
__SIGRTMIN + 94,
__SIGRTMIN + 95,
-1, /* SIGINFO */
-1, /* UNKNOWN */
-1, /* DEFAULT */
-1,
-1,
-1,
-1,
-1,
-1
#endif
};
#else
/* In system mode we only need SIGINT and SIGTRAP; other signals
are not yet supported. */
enum {
TARGET_SIGINT = 2,
TARGET_SIGTRAP = 5
};
static int gdb_signal_table[] = {
-1,
-1,
TARGET_SIGINT,
-1,
-1,
TARGET_SIGTRAP
};
#endif
#ifdef CONFIG_USER_ONLY
static int target_signal_to_gdb (int sig)
{
int i;
for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++)
if (gdb_signal_table[i] == sig)
return i;
return GDB_SIGNAL_UNKNOWN;
}
#endif
static int gdb_signal_to_target (int sig)
{
if (sig < ARRAY_SIZE (gdb_signal_table))
return gdb_signal_table[sig];
else
return -1;
}
typedef struct GDBRegisterState {
int base_reg;
int num_regs;
gdb_reg_cb get_reg;
gdb_reg_cb set_reg;
const char *xml;
struct GDBRegisterState *next;
} GDBRegisterState;
enum RSState {
RS_INACTIVE,
RS_IDLE,
RS_GETLINE,
RS_GETLINE_ESC,
RS_GETLINE_RLE,
RS_CHKSUM1,
RS_CHKSUM2,
};
typedef struct GDBState {
CPUState *c_cpu; /* current CPU for step/continue ops */
CPUState *g_cpu; /* current CPU for other ops */
CPUState *query_cpu; /* for q{f|s}ThreadInfo */
enum RSState state; /* parsing state */
char line_buf[MAX_PACKET_LENGTH];
int line_buf_index;
int line_sum; /* running checksum */
int line_csum; /* checksum at the end of the packet */
uint8_t last_packet[MAX_PACKET_LENGTH + 4];
int last_packet_len;
int signal;
#ifdef CONFIG_USER_ONLY
int fd;
int running_state;
#else
CharBackend chr;
Chardev *mon_chr;
#endif
char syscall_buf[256];
gdb_syscall_complete_cb current_syscall_cb;
} GDBState;
/* By default use no IRQs and no timers while single stepping so as to
* make single stepping like an ICE HW step.
*/
static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER;
static GDBState *gdbserver_state;
bool gdb_has_xml;
#ifdef CONFIG_USER_ONLY
/* XXX: This is not thread safe. Do we care? */
static int gdbserver_fd = -1;
static int get_char(GDBState *s)
{
uint8_t ch;
int ret;
for(;;) {
ret = qemu_recv(s->fd, &ch, 1, 0);
if (ret < 0) {
if (errno == ECONNRESET)
s->fd = -1;
if (errno != EINTR)
return -1;
} else if (ret == 0) {
close(s->fd);
s->fd = -1;
return -1;
} else {
break;
}
}
return ch;
}
#endif
static enum {
GDB_SYS_UNKNOWN,
GDB_SYS_ENABLED,
GDB_SYS_DISABLED,
} gdb_syscall_mode;
/* Decide if either remote gdb syscalls or native file IO should be used. */
int use_gdb_syscalls(void)
{
SemihostingTarget target = semihosting_get_target();
if (target == SEMIHOSTING_TARGET_NATIVE) {
/* -semihosting-config target=native */
return false;
} else if (target == SEMIHOSTING_TARGET_GDB) {
/* -semihosting-config target=gdb */
return true;
}
/* -semihosting-config target=auto */
/* On the first call check if gdb is connected and remember. */
if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
gdb_syscall_mode = (gdbserver_state ? GDB_SYS_ENABLED
: GDB_SYS_DISABLED);
}
return gdb_syscall_mode == GDB_SYS_ENABLED;
}
/* Resume execution. */
static inline void gdb_continue(GDBState *s)
{
#ifdef CONFIG_USER_ONLY
s->running_state = 1;
trace_gdbstub_op_continue();
#else
if (!runstate_needs_reset()) {
trace_gdbstub_op_continue();
vm_start();
}
#endif
}
/*
* Resume execution, per CPU actions. For user-mode emulation it's
* equivalent to gdb_continue.
*/
static int gdb_continue_partial(GDBState *s, char *newstates)
{
CPUState *cpu;
int res = 0;
#ifdef CONFIG_USER_ONLY
/*
* This is not exactly accurate, but it's an improvement compared to the
* previous situation, where only one CPU would be single-stepped.
*/
CPU_FOREACH(cpu) {
if (newstates[cpu->cpu_index] == 's') {
trace_gdbstub_op_stepping(cpu->cpu_index);
cpu_single_step(cpu, sstep_flags);
}
}
s->running_state = 1;
#else
int flag = 0;
if (!runstate_needs_reset()) {
if (vm_prepare_start()) {
return 0;
}
CPU_FOREACH(cpu) {
switch (newstates[cpu->cpu_index]) {
case 0:
case 1:
break; /* nothing to do here */
case 's':
trace_gdbstub_op_stepping(cpu->cpu_index);
cpu_single_step(cpu, sstep_flags);
cpu_resume(cpu);
flag = 1;
break;
case 'c':
trace_gdbstub_op_continue_cpu(cpu->cpu_index);
cpu_resume(cpu);
flag = 1;
break;
default:
res = -1;
break;
}
}
}
if (flag) {
qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
}
#endif
return res;
}
static void put_buffer(GDBState *s, const uint8_t *buf, int len)
{
#ifdef CONFIG_USER_ONLY
int ret;
while (len > 0) {
ret = send(s->fd, buf, len, 0);
if (ret < 0) {
if (errno != EINTR)
return;
} else {
buf += ret;
len -= ret;
}
}
#else
/* XXX this blocks entire thread. Rewrite to use
* qemu_chr_fe_write and background I/O callbacks */
qemu_chr_fe_write_all(&s->chr, buf, len);
#endif
}
static inline int fromhex(int v)
{
if (v >= '0' && v <= '9')
return v - '0';
else if (v >= 'A' && v <= 'F')
return v - 'A' + 10;
else if (v >= 'a' && v <= 'f')
return v - 'a' + 10;
else
return 0;
}
static inline int tohex(int v)
{
if (v < 10)
return v + '0';
else
return v - 10 + 'a';
}
/* writes 2*len+1 bytes in buf */
static void memtohex(char *buf, const uint8_t *mem, int len)
{
int i, c;
char *q;
q = buf;
for(i = 0; i < len; i++) {
c = mem[i];
*q++ = tohex(c >> 4);
*q++ = tohex(c & 0xf);
}
*q = '\0';
}
static void hextomem(uint8_t *mem, const char *buf, int len)
{
int i;
for(i = 0; i < len; i++) {
mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
buf += 2;
}
}
static void hexdump(const char *buf, int len,
void (*trace_fn)(size_t ofs, char const *text))
{
char line_buffer[3 * 16 + 4 + 16 + 1];
size_t i;
for (i = 0; i < len || (i & 0xF); ++i) {
size_t byte_ofs = i & 15;
if (byte_ofs == 0) {
memset(line_buffer, ' ', 3 * 16 + 4 + 16);
line_buffer[3 * 16 + 4 + 16] = 0;
}
size_t col_group = (i >> 2) & 3;
size_t hex_col = byte_ofs * 3 + col_group;
size_t txt_col = 3 * 16 + 4 + byte_ofs;
if (i < len) {
char value = buf[i];
line_buffer[hex_col + 0] = tohex((value >> 4) & 0xF);
line_buffer[hex_col + 1] = tohex((value >> 0) & 0xF);
line_buffer[txt_col + 0] = (value >= ' ' && value < 127)
? value
: '.';
}
if (byte_ofs == 0xF)
trace_fn(i & -16, line_buffer);
}
}
/* return -1 if error, 0 if OK */
static int put_packet_binary(GDBState *s, const char *buf, int len, bool dump)
{
int csum, i;
uint8_t *p;
if (dump && trace_event_get_state_backends(TRACE_GDBSTUB_IO_BINARYREPLY)) {
hexdump(buf, len, trace_gdbstub_io_binaryreply);
}
for(;;) {
p = s->last_packet;
*(p++) = '$';
memcpy(p, buf, len);
p += len;
csum = 0;
for(i = 0; i < len; i++) {
csum += buf[i];
}
*(p++) = '#';
*(p++) = tohex((csum >> 4) & 0xf);
*(p++) = tohex((csum) & 0xf);
s->last_packet_len = p - s->last_packet;
put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
#ifdef CONFIG_USER_ONLY
i = get_char(s);
if (i < 0)
return -1;
if (i == '+')
break;
#else
break;
#endif
}
return 0;
}
/* return -1 if error, 0 if OK */
static int put_packet(GDBState *s, const char *buf)
{
trace_gdbstub_io_reply(buf);
return put_packet_binary(s, buf, strlen(buf), false);
}
/* Encode data using the encoding for 'x' packets. */
static int memtox(char *buf, const char *mem, int len)
{
char *p = buf;
char c;
while (len--) {
c = *(mem++);
switch (c) {
case '#': case '$': case '*': case '}':
*(p++) = '}';
*(p++) = c ^ 0x20;
break;
default:
*(p++) = c;
break;
}
}
return p - buf;
}
static const char *get_feature_xml(const char *p, const char **newp,
CPUClass *cc)
{
size_t len;
int i;
const char *name;
static char target_xml[1024];
len = 0;
while (p[len] && p[len] != ':')
len++;
*newp = p + len;
name = NULL;
if (strncmp(p, "target.xml", len) == 0) {
/* Generate the XML description for this CPU. */
if (!target_xml[0]) {
GDBRegisterState *r;
CPUState *cpu = first_cpu;
pstrcat(target_xml, sizeof(target_xml),
"<?xml version=\"1.0\"?>"
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
"<target>");
if (cc->gdb_arch_name) {
gchar *arch = cc->gdb_arch_name(cpu);
pstrcat(target_xml, sizeof(target_xml), "<architecture>");
pstrcat(target_xml, sizeof(target_xml), arch);
pstrcat(target_xml, sizeof(target_xml), "</architecture>");
g_free(arch);
}
pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\"");
pstrcat(target_xml, sizeof(target_xml), cc->gdb_core_xml_file);
pstrcat(target_xml, sizeof(target_xml), "\"/>");
for (r = cpu->gdb_regs; r; r = r->next) {
pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\"");
pstrcat(target_xml, sizeof(target_xml), r->xml);
pstrcat(target_xml, sizeof(target_xml), "\"/>");
}
pstrcat(target_xml, sizeof(target_xml), "</target>");
}
return target_xml;
}
if (cc->gdb_get_dynamic_xml) {
CPUState *cpu = first_cpu;
char *xmlname = g_strndup(p, len);
const char *xml = cc->gdb_get_dynamic_xml(cpu, xmlname);
g_free(xmlname);
if (xml) {
return xml;
}
}
for (i = 0; ; i++) {
name = xml_builtin[i][0];
if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len))
break;
}
return name ? xml_builtin[i][1] : NULL;
}
static int gdb_read_register(CPUState *cpu, uint8_t *mem_buf, int reg)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
CPUArchState *env = cpu->env_ptr;
GDBRegisterState *r;
if (reg < cc->gdb_num_core_regs) {
return cc->gdb_read_register(cpu, mem_buf, reg);
}
for (r = cpu->gdb_regs; r; r = r->next) {
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
return r->get_reg(env, mem_buf, reg - r->base_reg);
}
}
return 0;
}
static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
CPUArchState *env = cpu->env_ptr;
GDBRegisterState *r;
if (reg < cc->gdb_num_core_regs) {
return cc->gdb_write_register(cpu, mem_buf, reg);
}
for (r = cpu->gdb_regs; r; r = r->next) {
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
return r->set_reg(env, mem_buf, reg - r->base_reg);
}
}
return 0;
}
/* Register a supplemental set of CPU registers. If g_pos is nonzero it
specifies the first register number and these registers are included in
a standard "g" packet. Direction is relative to gdb, i.e. get_reg is
gdb reading a CPU register, and set_reg is gdb modifying a CPU register.
*/
void gdb_register_coprocessor(CPUState *cpu,
gdb_reg_cb get_reg, gdb_reg_cb set_reg,
int num_regs, const char *xml, int g_pos)
{
GDBRegisterState *s;
GDBRegisterState **p;
p = &cpu->gdb_regs;
while (*p) {
/* Check for duplicates. */
if (strcmp((*p)->xml, xml) == 0)
return;
p = &(*p)->next;
}
s = g_new0(GDBRegisterState, 1);
s->base_reg = cpu->gdb_num_regs;
s->num_regs = num_regs;
s->get_reg = get_reg;
s->set_reg = set_reg;
s->xml = xml;
/* Add to end of list. */
cpu->gdb_num_regs += num_regs;
*p = s;
if (g_pos) {
if (g_pos != s->base_reg) {
error_report("Error: Bad gdb register numbering for '%s', "
"expected %d got %d", xml, g_pos, s->base_reg);
} else {
cpu->gdb_num_g_regs = cpu->gdb_num_regs;
}
}
}
#ifndef CONFIG_USER_ONLY
/* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */
static inline int xlat_gdb_type(CPUState *cpu, int gdbtype)
{
static const int xlat[] = {
[GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE,
[GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ,
[GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
};
CPUClass *cc = CPU_GET_CLASS(cpu);
int cputype = xlat[gdbtype];
if (cc->gdb_stop_before_watchpoint) {
cputype |= BP_STOP_BEFORE_ACCESS;
}
return cputype;
}
#endif
static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type)
{
CPUState *cpu;
int err = 0;
if (kvm_enabled()) {
return kvm_insert_breakpoint(gdbserver_state->c_cpu, addr, len, type);
}
switch (type) {
case GDB_BREAKPOINT_SW:
case GDB_BREAKPOINT_HW:
CPU_FOREACH(cpu) {
err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL);
if (err) {
break;
}
}
return err;
#ifndef CONFIG_USER_ONLY
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_ACCESS:
CPU_FOREACH(cpu) {
err = cpu_watchpoint_insert(cpu, addr, len,
xlat_gdb_type(cpu, type), NULL);
if (err) {
break;
}
}
return err;
#endif
default:
return -ENOSYS;
}
}
static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type)
{
CPUState *cpu;
int err = 0;
if (kvm_enabled()) {
return kvm_remove_breakpoint(gdbserver_state->c_cpu, addr, len, type);
}
switch (type) {
case GDB_BREAKPOINT_SW:
case GDB_BREAKPOINT_HW:
CPU_FOREACH(cpu) {
err = cpu_breakpoint_remove(cpu, addr, BP_GDB);
if (err) {
break;
}
}
return err;
#ifndef CONFIG_USER_ONLY
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_ACCESS:
CPU_FOREACH(cpu) {
err = cpu_watchpoint_remove(cpu, addr, len,
xlat_gdb_type(cpu, type));
if (err)
break;
}
return err;
#endif
default:
return -ENOSYS;
}
}
static void gdb_breakpoint_remove_all(void)
{
CPUState *cpu;
if (kvm_enabled()) {
kvm_remove_all_breakpoints(gdbserver_state->c_cpu);
return;
}
CPU_FOREACH(cpu) {
cpu_breakpoint_remove_all(cpu, BP_GDB);
#ifndef CONFIG_USER_ONLY
cpu_watchpoint_remove_all(cpu, BP_GDB);
#endif
}
}
static void gdb_set_cpu_pc(GDBState *s, target_ulong pc)
{
CPUState *cpu = s->c_cpu;
cpu_synchronize_state(cpu);
cpu_set_pc(cpu, pc);
}
static CPUState *find_cpu(uint32_t thread_id)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
if (cpu_gdb_index(cpu) == thread_id) {
return cpu;
}
}
return NULL;
}
static int is_query_packet(const char *p, const char *query, char separator)
{
unsigned int query_len = strlen(query);
return strncmp(p, query, query_len) == 0 &&
(p[query_len] == '\0' || p[query_len] == separator);
}
/**
* gdb_handle_vcont - Parses and handles a vCont packet.
* returns -ENOTSUP if a command is unsupported, -EINVAL or -ERANGE if there is
* a format error, 0 on success.
*/
static int gdb_handle_vcont(GDBState *s, const char *p)
{
int res, idx, signal = 0;
char cur_action;
char *newstates;
unsigned long tmp;
CPUState *cpu;
#ifdef CONFIG_USER_ONLY
int max_cpus = 1; /* global variable max_cpus exists only in system mode */
CPU_FOREACH(cpu) {
max_cpus = max_cpus <= cpu->cpu_index ? cpu->cpu_index + 1 : max_cpus;
}
#endif
/* uninitialised CPUs stay 0 */
newstates = g_new0(char, max_cpus);
/* mark valid CPUs with 1 */
CPU_FOREACH(cpu) {
newstates[cpu->cpu_index] = 1;
}
/*
* res keeps track of what error we are returning, with -ENOTSUP meaning
* that the command is unknown or unsupported, thus returning an empty
* packet, while -EINVAL and -ERANGE cause an E22 packet, due to invalid,
* or incorrect parameters passed.
*/
res = 0;
while (*p) {
if (*p++ != ';') {
res = -ENOTSUP;
goto out;
}
cur_action = *p++;
if (cur_action == 'C' || cur_action == 'S') {
cur_action = qemu_tolower(cur_action);
res = qemu_strtoul(p + 1, &p, 16, &tmp);
if (res) {
goto out;
}
signal = gdb_signal_to_target(tmp);
} else if (cur_action != 'c' && cur_action != 's') {
/* unknown/invalid/unsupported command */
res = -ENOTSUP;
goto out;
}
/* thread specification. special values: (none), -1 = all; 0 = any */
if ((p[0] == ':' && p[1] == '-' && p[2] == '1') || (p[0] != ':')) {
if (*p == ':') {
p += 3;
}
for (idx = 0; idx < max_cpus; idx++) {
if (newstates[idx] == 1) {
newstates[idx] = cur_action;
}
}
} else if (*p == ':') {
p++;
res = qemu_strtoul(p, &p, 16, &tmp);
if (res) {
goto out;
}
/* 0 means any thread, so we pick the first valid CPU */
cpu = tmp ? find_cpu(tmp) : first_cpu;
/* invalid CPU/thread specified */
if (!cpu) {
res = -EINVAL;
goto out;
}
/* only use if no previous match occourred */
if (newstates[cpu->cpu_index] == 1) {
newstates[cpu->cpu_index] = cur_action;
}
}
}
s->signal = signal;
gdb_continue_partial(s, newstates);
out: