s390x/sclpconsole-lm: truncate input if line is too long
[qemu.git] / gdbstub.c
1 /*
2 * gdb server stub
3 *
4 * Copyright (c) 2003-2005 Fabrice Bellard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19 #include "config.h"
20 #include "qemu-common.h"
21 #ifdef CONFIG_USER_ONLY
22 #include <stdlib.h>
23 #include <stdio.h>
24 #include <stdarg.h>
25 #include <string.h>
26 #include <errno.h>
27 #include <unistd.h>
28 #include <fcntl.h>
29
30 #include "qemu.h"
31 #else
32 #include "monitor/monitor.h"
33 #include "sysemu/char.h"
34 #include "sysemu/sysemu.h"
35 #include "exec/gdbstub.h"
36 #endif
37
38 #define MAX_PACKET_LENGTH 4096
39
40 #include "cpu.h"
41 #include "qemu/sockets.h"
42 #include "sysemu/kvm.h"
43
44 static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
45 uint8_t *buf, int len, bool is_write)
46 {
47 CPUClass *cc = CPU_GET_CLASS(cpu);
48
49 if (cc->memory_rw_debug) {
50 return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
51 }
52 return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
53 }
54
55 enum {
56 GDB_SIGNAL_0 = 0,
57 GDB_SIGNAL_INT = 2,
58 GDB_SIGNAL_QUIT = 3,
59 GDB_SIGNAL_TRAP = 5,
60 GDB_SIGNAL_ABRT = 6,
61 GDB_SIGNAL_ALRM = 14,
62 GDB_SIGNAL_IO = 23,
63 GDB_SIGNAL_XCPU = 24,
64 GDB_SIGNAL_UNKNOWN = 143
65 };
66
67 #ifdef CONFIG_USER_ONLY
68
69 /* Map target signal numbers to GDB protocol signal numbers and vice
70 * versa. For user emulation's currently supported systems, we can
71 * assume most signals are defined.
72 */
73
74 static int gdb_signal_table[] = {
75 0,
76 TARGET_SIGHUP,
77 TARGET_SIGINT,
78 TARGET_SIGQUIT,
79 TARGET_SIGILL,
80 TARGET_SIGTRAP,
81 TARGET_SIGABRT,
82 -1, /* SIGEMT */
83 TARGET_SIGFPE,
84 TARGET_SIGKILL,
85 TARGET_SIGBUS,
86 TARGET_SIGSEGV,
87 TARGET_SIGSYS,
88 TARGET_SIGPIPE,
89 TARGET_SIGALRM,
90 TARGET_SIGTERM,
91 TARGET_SIGURG,
92 TARGET_SIGSTOP,
93 TARGET_SIGTSTP,
94 TARGET_SIGCONT,
95 TARGET_SIGCHLD,
96 TARGET_SIGTTIN,
97 TARGET_SIGTTOU,
98 TARGET_SIGIO,
99 TARGET_SIGXCPU,
100 TARGET_SIGXFSZ,
101 TARGET_SIGVTALRM,
102 TARGET_SIGPROF,
103 TARGET_SIGWINCH,
104 -1, /* SIGLOST */
105 TARGET_SIGUSR1,
106 TARGET_SIGUSR2,
107 #ifdef TARGET_SIGPWR
108 TARGET_SIGPWR,
109 #else
110 -1,
111 #endif
112 -1, /* SIGPOLL */
113 -1,
114 -1,
115 -1,
116 -1,
117 -1,
118 -1,
119 -1,
120 -1,
121 -1,
122 -1,
123 -1,
124 #ifdef __SIGRTMIN
125 __SIGRTMIN + 1,
126 __SIGRTMIN + 2,
127 __SIGRTMIN + 3,
128 __SIGRTMIN + 4,
129 __SIGRTMIN + 5,
130 __SIGRTMIN + 6,
131 __SIGRTMIN + 7,
132 __SIGRTMIN + 8,
133 __SIGRTMIN + 9,
134 __SIGRTMIN + 10,
135 __SIGRTMIN + 11,
136 __SIGRTMIN + 12,
137 __SIGRTMIN + 13,
138 __SIGRTMIN + 14,
139 __SIGRTMIN + 15,
140 __SIGRTMIN + 16,
141 __SIGRTMIN + 17,
142 __SIGRTMIN + 18,
143 __SIGRTMIN + 19,
144 __SIGRTMIN + 20,
145 __SIGRTMIN + 21,
146 __SIGRTMIN + 22,
147 __SIGRTMIN + 23,
148 __SIGRTMIN + 24,
149 __SIGRTMIN + 25,
150 __SIGRTMIN + 26,
151 __SIGRTMIN + 27,
152 __SIGRTMIN + 28,
153 __SIGRTMIN + 29,
154 __SIGRTMIN + 30,
155 __SIGRTMIN + 31,
156 -1, /* SIGCANCEL */
157 __SIGRTMIN,
158 __SIGRTMIN + 32,
159 __SIGRTMIN + 33,
160 __SIGRTMIN + 34,
161 __SIGRTMIN + 35,
162 __SIGRTMIN + 36,
163 __SIGRTMIN + 37,
164 __SIGRTMIN + 38,
165 __SIGRTMIN + 39,
166 __SIGRTMIN + 40,
167 __SIGRTMIN + 41,
168 __SIGRTMIN + 42,
169 __SIGRTMIN + 43,
170 __SIGRTMIN + 44,
171 __SIGRTMIN + 45,
172 __SIGRTMIN + 46,
173 __SIGRTMIN + 47,
174 __SIGRTMIN + 48,
175 __SIGRTMIN + 49,
176 __SIGRTMIN + 50,
177 __SIGRTMIN + 51,
178 __SIGRTMIN + 52,
179 __SIGRTMIN + 53,
180 __SIGRTMIN + 54,
181 __SIGRTMIN + 55,
182 __SIGRTMIN + 56,
183 __SIGRTMIN + 57,
184 __SIGRTMIN + 58,
185 __SIGRTMIN + 59,
186 __SIGRTMIN + 60,
187 __SIGRTMIN + 61,
188 __SIGRTMIN + 62,
189 __SIGRTMIN + 63,
190 __SIGRTMIN + 64,
191 __SIGRTMIN + 65,
192 __SIGRTMIN + 66,
193 __SIGRTMIN + 67,
194 __SIGRTMIN + 68,
195 __SIGRTMIN + 69,
196 __SIGRTMIN + 70,
197 __SIGRTMIN + 71,
198 __SIGRTMIN + 72,
199 __SIGRTMIN + 73,
200 __SIGRTMIN + 74,
201 __SIGRTMIN + 75,
202 __SIGRTMIN + 76,
203 __SIGRTMIN + 77,
204 __SIGRTMIN + 78,
205 __SIGRTMIN + 79,
206 __SIGRTMIN + 80,
207 __SIGRTMIN + 81,
208 __SIGRTMIN + 82,
209 __SIGRTMIN + 83,
210 __SIGRTMIN + 84,
211 __SIGRTMIN + 85,
212 __SIGRTMIN + 86,
213 __SIGRTMIN + 87,
214 __SIGRTMIN + 88,
215 __SIGRTMIN + 89,
216 __SIGRTMIN + 90,
217 __SIGRTMIN + 91,
218 __SIGRTMIN + 92,
219 __SIGRTMIN + 93,
220 __SIGRTMIN + 94,
221 __SIGRTMIN + 95,
222 -1, /* SIGINFO */
223 -1, /* UNKNOWN */
224 -1, /* DEFAULT */
225 -1,
226 -1,
227 -1,
228 -1,
229 -1,
230 -1
231 #endif
232 };
233 #else
234 /* In system mode we only need SIGINT and SIGTRAP; other signals
235 are not yet supported. */
236
237 enum {
238 TARGET_SIGINT = 2,
239 TARGET_SIGTRAP = 5
240 };
241
242 static int gdb_signal_table[] = {
243 -1,
244 -1,
245 TARGET_SIGINT,
246 -1,
247 -1,
248 TARGET_SIGTRAP
249 };
250 #endif
251
252 #ifdef CONFIG_USER_ONLY
253 static int target_signal_to_gdb (int sig)
254 {
255 int i;
256 for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++)
257 if (gdb_signal_table[i] == sig)
258 return i;
259 return GDB_SIGNAL_UNKNOWN;
260 }
261 #endif
262
263 static int gdb_signal_to_target (int sig)
264 {
265 if (sig < ARRAY_SIZE (gdb_signal_table))
266 return gdb_signal_table[sig];
267 else
268 return -1;
269 }
270
271 //#define DEBUG_GDB
272
273 typedef struct GDBRegisterState {
274 int base_reg;
275 int num_regs;
276 gdb_reg_cb get_reg;
277 gdb_reg_cb set_reg;
278 const char *xml;
279 struct GDBRegisterState *next;
280 } GDBRegisterState;
281
282 enum RSState {
283 RS_INACTIVE,
284 RS_IDLE,
285 RS_GETLINE,
286 RS_CHKSUM1,
287 RS_CHKSUM2,
288 };
289 typedef struct GDBState {
290 CPUState *c_cpu; /* current CPU for step/continue ops */
291 CPUState *g_cpu; /* current CPU for other ops */
292 CPUState *query_cpu; /* for q{f|s}ThreadInfo */
293 enum RSState state; /* parsing state */
294 char line_buf[MAX_PACKET_LENGTH];
295 int line_buf_index;
296 int line_csum;
297 uint8_t last_packet[MAX_PACKET_LENGTH + 4];
298 int last_packet_len;
299 int signal;
300 #ifdef CONFIG_USER_ONLY
301 int fd;
302 int running_state;
303 #else
304 CharDriverState *chr;
305 CharDriverState *mon_chr;
306 #endif
307 char syscall_buf[256];
308 gdb_syscall_complete_cb current_syscall_cb;
309 } GDBState;
310
311 /* By default use no IRQs and no timers while single stepping so as to
312 * make single stepping like an ICE HW step.
313 */
314 static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER;
315
316 static GDBState *gdbserver_state;
317
318 bool gdb_has_xml;
319
320 #ifdef CONFIG_USER_ONLY
321 /* XXX: This is not thread safe. Do we care? */
322 static int gdbserver_fd = -1;
323
324 static int get_char(GDBState *s)
325 {
326 uint8_t ch;
327 int ret;
328
329 for(;;) {
330 ret = qemu_recv(s->fd, &ch, 1, 0);
331 if (ret < 0) {
332 if (errno == ECONNRESET)
333 s->fd = -1;
334 if (errno != EINTR && errno != EAGAIN)
335 return -1;
336 } else if (ret == 0) {
337 close(s->fd);
338 s->fd = -1;
339 return -1;
340 } else {
341 break;
342 }
343 }
344 return ch;
345 }
346 #endif
347
348 static enum {
349 GDB_SYS_UNKNOWN,
350 GDB_SYS_ENABLED,
351 GDB_SYS_DISABLED,
352 } gdb_syscall_mode;
353
354 /* If gdb is connected when the first semihosting syscall occurs then use
355 remote gdb syscalls. Otherwise use native file IO. */
356 int use_gdb_syscalls(void)
357 {
358 if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
359 gdb_syscall_mode = (gdbserver_state ? GDB_SYS_ENABLED
360 : GDB_SYS_DISABLED);
361 }
362 return gdb_syscall_mode == GDB_SYS_ENABLED;
363 }
364
365 /* Resume execution. */
366 static inline void gdb_continue(GDBState *s)
367 {
368 #ifdef CONFIG_USER_ONLY
369 s->running_state = 1;
370 #else
371 if (!runstate_needs_reset()) {
372 vm_start();
373 }
374 #endif
375 }
376
377 static void put_buffer(GDBState *s, const uint8_t *buf, int len)
378 {
379 #ifdef CONFIG_USER_ONLY
380 int ret;
381
382 while (len > 0) {
383 ret = send(s->fd, buf, len, 0);
384 if (ret < 0) {
385 if (errno != EINTR && errno != EAGAIN)
386 return;
387 } else {
388 buf += ret;
389 len -= ret;
390 }
391 }
392 #else
393 qemu_chr_fe_write(s->chr, buf, len);
394 #endif
395 }
396
397 static inline int fromhex(int v)
398 {
399 if (v >= '0' && v <= '9')
400 return v - '0';
401 else if (v >= 'A' && v <= 'F')
402 return v - 'A' + 10;
403 else if (v >= 'a' && v <= 'f')
404 return v - 'a' + 10;
405 else
406 return 0;
407 }
408
409 static inline int tohex(int v)
410 {
411 if (v < 10)
412 return v + '0';
413 else
414 return v - 10 + 'a';
415 }
416
417 static void memtohex(char *buf, const uint8_t *mem, int len)
418 {
419 int i, c;
420 char *q;
421 q = buf;
422 for(i = 0; i < len; i++) {
423 c = mem[i];
424 *q++ = tohex(c >> 4);
425 *q++ = tohex(c & 0xf);
426 }
427 *q = '\0';
428 }
429
430 static void hextomem(uint8_t *mem, const char *buf, int len)
431 {
432 int i;
433
434 for(i = 0; i < len; i++) {
435 mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
436 buf += 2;
437 }
438 }
439
440 /* return -1 if error, 0 if OK */
441 static int put_packet_binary(GDBState *s, const char *buf, int len)
442 {
443 int csum, i;
444 uint8_t *p;
445
446 for(;;) {
447 p = s->last_packet;
448 *(p++) = '$';
449 memcpy(p, buf, len);
450 p += len;
451 csum = 0;
452 for(i = 0; i < len; i++) {
453 csum += buf[i];
454 }
455 *(p++) = '#';
456 *(p++) = tohex((csum >> 4) & 0xf);
457 *(p++) = tohex((csum) & 0xf);
458
459 s->last_packet_len = p - s->last_packet;
460 put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
461
462 #ifdef CONFIG_USER_ONLY
463 i = get_char(s);
464 if (i < 0)
465 return -1;
466 if (i == '+')
467 break;
468 #else
469 break;
470 #endif
471 }
472 return 0;
473 }
474
475 /* return -1 if error, 0 if OK */
476 static int put_packet(GDBState *s, const char *buf)
477 {
478 #ifdef DEBUG_GDB
479 printf("reply='%s'\n", buf);
480 #endif
481
482 return put_packet_binary(s, buf, strlen(buf));
483 }
484
485 /* Encode data using the encoding for 'x' packets. */
486 static int memtox(char *buf, const char *mem, int len)
487 {
488 char *p = buf;
489 char c;
490
491 while (len--) {
492 c = *(mem++);
493 switch (c) {
494 case '#': case '$': case '*': case '}':
495 *(p++) = '}';
496 *(p++) = c ^ 0x20;
497 break;
498 default:
499 *(p++) = c;
500 break;
501 }
502 }
503 return p - buf;
504 }
505
506 static const char *get_feature_xml(const char *p, const char **newp,
507 CPUClass *cc)
508 {
509 size_t len;
510 int i;
511 const char *name;
512 static char target_xml[1024];
513
514 len = 0;
515 while (p[len] && p[len] != ':')
516 len++;
517 *newp = p + len;
518
519 name = NULL;
520 if (strncmp(p, "target.xml", len) == 0) {
521 /* Generate the XML description for this CPU. */
522 if (!target_xml[0]) {
523 GDBRegisterState *r;
524 CPUState *cpu = first_cpu;
525
526 snprintf(target_xml, sizeof(target_xml),
527 "<?xml version=\"1.0\"?>"
528 "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
529 "<target>"
530 "<xi:include href=\"%s\"/>",
531 cc->gdb_core_xml_file);
532
533 for (r = cpu->gdb_regs; r; r = r->next) {
534 pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\"");
535 pstrcat(target_xml, sizeof(target_xml), r->xml);
536 pstrcat(target_xml, sizeof(target_xml), "\"/>");
537 }
538 pstrcat(target_xml, sizeof(target_xml), "</target>");
539 }
540 return target_xml;
541 }
542 for (i = 0; ; i++) {
543 name = xml_builtin[i][0];
544 if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len))
545 break;
546 }
547 return name ? xml_builtin[i][1] : NULL;
548 }
549
550 static int gdb_read_register(CPUState *cpu, uint8_t *mem_buf, int reg)
551 {
552 CPUClass *cc = CPU_GET_CLASS(cpu);
553 CPUArchState *env = cpu->env_ptr;
554 GDBRegisterState *r;
555
556 if (reg < cc->gdb_num_core_regs) {
557 return cc->gdb_read_register(cpu, mem_buf, reg);
558 }
559
560 for (r = cpu->gdb_regs; r; r = r->next) {
561 if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
562 return r->get_reg(env, mem_buf, reg - r->base_reg);
563 }
564 }
565 return 0;
566 }
567
568 static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg)
569 {
570 CPUClass *cc = CPU_GET_CLASS(cpu);
571 CPUArchState *env = cpu->env_ptr;
572 GDBRegisterState *r;
573
574 if (reg < cc->gdb_num_core_regs) {
575 return cc->gdb_write_register(cpu, mem_buf, reg);
576 }
577
578 for (r = cpu->gdb_regs; r; r = r->next) {
579 if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
580 return r->set_reg(env, mem_buf, reg - r->base_reg);
581 }
582 }
583 return 0;
584 }
585
586 /* Register a supplemental set of CPU registers. If g_pos is nonzero it
587 specifies the first register number and these registers are included in
588 a standard "g" packet. Direction is relative to gdb, i.e. get_reg is
589 gdb reading a CPU register, and set_reg is gdb modifying a CPU register.
590 */
591
592 void gdb_register_coprocessor(CPUState *cpu,
593 gdb_reg_cb get_reg, gdb_reg_cb set_reg,
594 int num_regs, const char *xml, int g_pos)
595 {
596 GDBRegisterState *s;
597 GDBRegisterState **p;
598
599 p = &cpu->gdb_regs;
600 while (*p) {
601 /* Check for duplicates. */
602 if (strcmp((*p)->xml, xml) == 0)
603 return;
604 p = &(*p)->next;
605 }
606
607 s = g_new0(GDBRegisterState, 1);
608 s->base_reg = cpu->gdb_num_regs;
609 s->num_regs = num_regs;
610 s->get_reg = get_reg;
611 s->set_reg = set_reg;
612 s->xml = xml;
613
614 /* Add to end of list. */
615 cpu->gdb_num_regs += num_regs;
616 *p = s;
617 if (g_pos) {
618 if (g_pos != s->base_reg) {
619 fprintf(stderr, "Error: Bad gdb register numbering for '%s'\n"
620 "Expected %d got %d\n", xml, g_pos, s->base_reg);
621 } else {
622 cpu->gdb_num_g_regs = cpu->gdb_num_regs;
623 }
624 }
625 }
626
627 #ifndef CONFIG_USER_ONLY
628 /* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */
629 static inline int xlat_gdb_type(CPUState *cpu, int gdbtype)
630 {
631 static const int xlat[] = {
632 [GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE,
633 [GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ,
634 [GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
635 };
636
637 CPUClass *cc = CPU_GET_CLASS(cpu);
638 int cputype = xlat[gdbtype];
639
640 if (cc->gdb_stop_before_watchpoint) {
641 cputype |= BP_STOP_BEFORE_ACCESS;
642 }
643 return cputype;
644 }
645 #endif
646
647 static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type)
648 {
649 CPUState *cpu;
650 int err = 0;
651
652 if (kvm_enabled()) {
653 return kvm_insert_breakpoint(gdbserver_state->c_cpu, addr, len, type);
654 }
655
656 switch (type) {
657 case GDB_BREAKPOINT_SW:
658 case GDB_BREAKPOINT_HW:
659 CPU_FOREACH(cpu) {
660 err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL);
661 if (err) {
662 break;
663 }
664 }
665 return err;
666 #ifndef CONFIG_USER_ONLY
667 case GDB_WATCHPOINT_WRITE:
668 case GDB_WATCHPOINT_READ:
669 case GDB_WATCHPOINT_ACCESS:
670 CPU_FOREACH(cpu) {
671 err = cpu_watchpoint_insert(cpu, addr, len,
672 xlat_gdb_type(cpu, type), NULL);
673 if (err) {
674 break;
675 }
676 }
677 return err;
678 #endif
679 default:
680 return -ENOSYS;
681 }
682 }
683
684 static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type)
685 {
686 CPUState *cpu;
687 int err = 0;
688
689 if (kvm_enabled()) {
690 return kvm_remove_breakpoint(gdbserver_state->c_cpu, addr, len, type);
691 }
692
693 switch (type) {
694 case GDB_BREAKPOINT_SW:
695 case GDB_BREAKPOINT_HW:
696 CPU_FOREACH(cpu) {
697 err = cpu_breakpoint_remove(cpu, addr, BP_GDB);
698 if (err) {
699 break;
700 }
701 }
702 return err;
703 #ifndef CONFIG_USER_ONLY
704 case GDB_WATCHPOINT_WRITE:
705 case GDB_WATCHPOINT_READ:
706 case GDB_WATCHPOINT_ACCESS:
707 CPU_FOREACH(cpu) {
708 err = cpu_watchpoint_remove(cpu, addr, len,
709 xlat_gdb_type(cpu, type));
710 if (err)
711 break;
712 }
713 return err;
714 #endif
715 default:
716 return -ENOSYS;
717 }
718 }
719
720 static void gdb_breakpoint_remove_all(void)
721 {
722 CPUState *cpu;
723
724 if (kvm_enabled()) {
725 kvm_remove_all_breakpoints(gdbserver_state->c_cpu);
726 return;
727 }
728
729 CPU_FOREACH(cpu) {
730 cpu_breakpoint_remove_all(cpu, BP_GDB);
731 #ifndef CONFIG_USER_ONLY
732 cpu_watchpoint_remove_all(cpu, BP_GDB);
733 #endif
734 }
735 }
736
737 static void gdb_set_cpu_pc(GDBState *s, target_ulong pc)
738 {
739 CPUState *cpu = s->c_cpu;
740 CPUClass *cc = CPU_GET_CLASS(cpu);
741
742 cpu_synchronize_state(cpu);
743 if (cc->set_pc) {
744 cc->set_pc(cpu, pc);
745 }
746 }
747
748 static CPUState *find_cpu(uint32_t thread_id)
749 {
750 CPUState *cpu;
751
752 CPU_FOREACH(cpu) {
753 if (cpu_index(cpu) == thread_id) {
754 return cpu;
755 }
756 }
757
758 return NULL;
759 }
760
761 static int gdb_handle_packet(GDBState *s, const char *line_buf)
762 {
763 CPUState *cpu;
764 CPUClass *cc;
765 const char *p;
766 uint32_t thread;
767 int ch, reg_size, type, res;
768 char buf[MAX_PACKET_LENGTH];
769 uint8_t mem_buf[MAX_PACKET_LENGTH];
770 uint8_t *registers;
771 target_ulong addr, len;
772
773 #ifdef DEBUG_GDB
774 printf("command='%s'\n", line_buf);
775 #endif
776 p = line_buf;
777 ch = *p++;
778 switch(ch) {
779 case '?':
780 /* TODO: Make this return the correct value for user-mode. */
781 snprintf(buf, sizeof(buf), "T%02xthread:%02x;", GDB_SIGNAL_TRAP,
782 cpu_index(s->c_cpu));
783 put_packet(s, buf);
784 /* Remove all the breakpoints when this query is issued,
785 * because gdb is doing and initial connect and the state
786 * should be cleaned up.
787 */
788 gdb_breakpoint_remove_all();
789 break;
790 case 'c':
791 if (*p != '\0') {
792 addr = strtoull(p, (char **)&p, 16);
793 gdb_set_cpu_pc(s, addr);
794 }
795 s->signal = 0;
796 gdb_continue(s);
797 return RS_IDLE;
798 case 'C':
799 s->signal = gdb_signal_to_target (strtoul(p, (char **)&p, 16));
800 if (s->signal == -1)
801 s->signal = 0;
802 gdb_continue(s);
803 return RS_IDLE;
804 case 'v':
805 if (strncmp(p, "Cont", 4) == 0) {
806 int res_signal, res_thread;
807
808 p += 4;
809 if (*p == '?') {
810 put_packet(s, "vCont;c;C;s;S");
811 break;
812 }
813 res = 0;
814 res_signal = 0;
815 res_thread = 0;
816 while (*p) {
817 int action, signal;
818
819 if (*p++ != ';') {
820 res = 0;
821 break;
822 }
823 action = *p++;
824 signal = 0;
825 if (action == 'C' || action == 'S') {
826 signal = strtoul(p, (char **)&p, 16);
827 } else if (action != 'c' && action != 's') {
828 res = 0;
829 break;
830 }
831 thread = 0;
832 if (*p == ':') {
833 thread = strtoull(p+1, (char **)&p, 16);
834 }
835 action = tolower(action);
836 if (res == 0 || (res == 'c' && action == 's')) {
837 res = action;
838 res_signal = signal;
839 res_thread = thread;
840 }
841 }
842 if (res) {
843 if (res_thread != -1 && res_thread != 0) {
844 cpu = find_cpu(res_thread);
845 if (cpu == NULL) {
846 put_packet(s, "E22");
847 break;
848 }
849 s->c_cpu = cpu;
850 }
851 if (res == 's') {
852 cpu_single_step(s->c_cpu, sstep_flags);
853 }
854 s->signal = res_signal;
855 gdb_continue(s);
856 return RS_IDLE;
857 }
858 break;
859 } else {
860 goto unknown_command;
861 }
862 case 'k':
863 #ifdef CONFIG_USER_ONLY
864 /* Kill the target */
865 fprintf(stderr, "\nQEMU: Terminated via GDBstub\n");
866 exit(0);
867 #endif
868 case 'D':
869 /* Detach packet */
870 gdb_breakpoint_remove_all();
871 gdb_syscall_mode = GDB_SYS_DISABLED;
872 gdb_continue(s);
873 put_packet(s, "OK");
874 break;
875 case 's':
876 if (*p != '\0') {
877 addr = strtoull(p, (char **)&p, 16);
878 gdb_set_cpu_pc(s, addr);
879 }
880 cpu_single_step(s->c_cpu, sstep_flags);
881 gdb_continue(s);
882 return RS_IDLE;
883 case 'F':
884 {
885 target_ulong ret;
886 target_ulong err;
887
888 ret = strtoull(p, (char **)&p, 16);
889 if (*p == ',') {
890 p++;
891 err = strtoull(p, (char **)&p, 16);
892 } else {
893 err = 0;
894 }
895 if (*p == ',')
896 p++;
897 type = *p;
898 if (s->current_syscall_cb) {
899 s->current_syscall_cb(s->c_cpu, ret, err);
900 s->current_syscall_cb = NULL;
901 }
902 if (type == 'C') {
903 put_packet(s, "T02");
904 } else {
905 gdb_continue(s);
906 }
907 }
908 break;
909 case 'g':
910 cpu_synchronize_state(s->g_cpu);
911 len = 0;
912 for (addr = 0; addr < s->g_cpu->gdb_num_g_regs; addr++) {
913 reg_size = gdb_read_register(s->g_cpu, mem_buf + len, addr);
914 len += reg_size;
915 }
916 memtohex(buf, mem_buf, len);
917 put_packet(s, buf);
918 break;
919 case 'G':
920 cpu_synchronize_state(s->g_cpu);
921 registers = mem_buf;
922 len = strlen(p) / 2;
923 hextomem((uint8_t *)registers, p, len);
924 for (addr = 0; addr < s->g_cpu->gdb_num_g_regs && len > 0; addr++) {
925 reg_size = gdb_write_register(s->g_cpu, registers, addr);
926 len -= reg_size;
927 registers += reg_size;
928 }
929 put_packet(s, "OK");
930 break;
931 case 'm':
932 addr = strtoull(p, (char **)&p, 16);
933 if (*p == ',')
934 p++;
935 len = strtoull(p, NULL, 16);
936 if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, false) != 0) {
937 put_packet (s, "E14");
938 } else {
939 memtohex(buf, mem_buf, len);
940 put_packet(s, buf);
941 }
942 break;
943 case 'M':
944 addr = strtoull(p, (char **)&p, 16);
945 if (*p == ',')
946 p++;
947 len = strtoull(p, (char **)&p, 16);
948 if (*p == ':')
949 p++;
950 hextomem(mem_buf, p, len);
951 if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len,
952 true) != 0) {
953 put_packet(s, "E14");
954 } else {
955 put_packet(s, "OK");
956 }
957 break;
958 case 'p':
959 /* Older gdb are really dumb, and don't use 'g' if 'p' is avaialable.
960 This works, but can be very slow. Anything new enough to
961 understand XML also knows how to use this properly. */
962 if (!gdb_has_xml)
963 goto unknown_command;
964 addr = strtoull(p, (char **)&p, 16);
965 reg_size = gdb_read_register(s->g_cpu, mem_buf, addr);
966 if (reg_size) {
967 memtohex(buf, mem_buf, reg_size);
968 put_packet(s, buf);
969 } else {
970 put_packet(s, "E14");
971 }
972 break;
973 case 'P':
974 if (!gdb_has_xml)
975 goto unknown_command;
976 addr = strtoull(p, (char **)&p, 16);
977 if (*p == '=')
978 p++;
979 reg_size = strlen(p) / 2;
980 hextomem(mem_buf, p, reg_size);
981 gdb_write_register(s->g_cpu, mem_buf, addr);
982 put_packet(s, "OK");
983 break;
984 case 'Z':
985 case 'z':
986 type = strtoul(p, (char **)&p, 16);
987 if (*p == ',')
988 p++;
989 addr = strtoull(p, (char **)&p, 16);
990 if (*p == ',')
991 p++;
992 len = strtoull(p, (char **)&p, 16);
993 if (ch == 'Z')
994 res = gdb_breakpoint_insert(addr, len, type);
995 else
996 res = gdb_breakpoint_remove(addr, len, type);
997 if (res >= 0)
998 put_packet(s, "OK");
999 else if (res == -ENOSYS)
1000 put_packet(s, "");
1001 else
1002 put_packet(s, "E22");
1003 break;
1004 case 'H':
1005 type = *p++;
1006 thread = strtoull(p, (char **)&p, 16);
1007 if (thread == -1 || thread == 0) {
1008 put_packet(s, "OK");
1009 break;
1010 }
1011 cpu = find_cpu(thread);
1012 if (cpu == NULL) {
1013 put_packet(s, "E22");
1014 break;
1015 }
1016 switch (type) {
1017 case 'c':
1018 s->c_cpu = cpu;
1019 put_packet(s, "OK");
1020 break;
1021 case 'g':
1022 s->g_cpu = cpu;
1023 put_packet(s, "OK");
1024 break;
1025 default:
1026 put_packet(s, "E22");
1027 break;
1028 }
1029 break;
1030 case 'T':
1031 thread = strtoull(p, (char **)&p, 16);
1032 cpu = find_cpu(thread);
1033
1034 if (cpu != NULL) {
1035 put_packet(s, "OK");
1036 } else {
1037 put_packet(s, "E22");
1038 }
1039 break;
1040 case 'q':
1041 case 'Q':
1042 /* parse any 'q' packets here */
1043 if (!strcmp(p,"qemu.sstepbits")) {
1044 /* Query Breakpoint bit definitions */
1045 snprintf(buf, sizeof(buf), "ENABLE=%x,NOIRQ=%x,NOTIMER=%x",
1046 SSTEP_ENABLE,
1047 SSTEP_NOIRQ,
1048 SSTEP_NOTIMER);
1049 put_packet(s, buf);
1050 break;
1051 } else if (strncmp(p,"qemu.sstep",10) == 0) {
1052 /* Display or change the sstep_flags */
1053 p += 10;
1054 if (*p != '=') {
1055 /* Display current setting */
1056 snprintf(buf, sizeof(buf), "0x%x", sstep_flags);
1057 put_packet(s, buf);
1058 break;
1059 }
1060 p++;
1061 type = strtoul(p, (char **)&p, 16);
1062 sstep_flags = type;
1063 put_packet(s, "OK");
1064 break;
1065 } else if (strcmp(p,"C") == 0) {
1066 /* "Current thread" remains vague in the spec, so always return
1067 * the first CPU (gdb returns the first thread). */
1068 put_packet(s, "QC1");
1069 break;
1070 } else if (strcmp(p,"fThreadInfo") == 0) {
1071 s->query_cpu = first_cpu;
1072 goto report_cpuinfo;
1073 } else if (strcmp(p,"sThreadInfo") == 0) {
1074 report_cpuinfo:
1075 if (s->query_cpu) {
1076 snprintf(buf, sizeof(buf), "m%x", cpu_index(s->query_cpu));
1077 put_packet(s, buf);
1078 s->query_cpu = CPU_NEXT(s->query_cpu);
1079 } else
1080 put_packet(s, "l");
1081 break;
1082 } else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) {
1083 thread = strtoull(p+16, (char **)&p, 16);
1084 cpu = find_cpu(thread);
1085 if (cpu != NULL) {
1086 cpu_synchronize_state(cpu);
1087 len = snprintf((char *)mem_buf, sizeof(mem_buf),
1088 "CPU#%d [%s]", cpu->cpu_index,
1089 cpu->halted ? "halted " : "running");
1090 memtohex(buf, mem_buf, len);
1091 put_packet(s, buf);
1092 }
1093 break;
1094 }
1095 #ifdef CONFIG_USER_ONLY
1096 else if (strncmp(p, "Offsets", 7) == 0) {
1097 TaskState *ts = s->c_cpu->opaque;
1098
1099 snprintf(buf, sizeof(buf),
1100 "Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx
1101 ";Bss=" TARGET_ABI_FMT_lx,
1102 ts->info->code_offset,
1103 ts->info->data_offset,
1104 ts->info->data_offset);
1105 put_packet(s, buf);
1106 break;
1107 }
1108 #else /* !CONFIG_USER_ONLY */
1109 else if (strncmp(p, "Rcmd,", 5) == 0) {
1110 int len = strlen(p + 5);
1111
1112 if ((len % 2) != 0) {
1113 put_packet(s, "E01");
1114 break;
1115 }
1116 hextomem(mem_buf, p + 5, len);
1117 len = len / 2;
1118 mem_buf[len++] = 0;
1119 qemu_chr_be_write(s->mon_chr, mem_buf, len);
1120 put_packet(s, "OK");
1121 break;
1122 }
1123 #endif /* !CONFIG_USER_ONLY */
1124 if (strncmp(p, "Supported", 9) == 0) {
1125 snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH);
1126 cc = CPU_GET_CLASS(first_cpu);
1127 if (cc->gdb_core_xml_file != NULL) {
1128 pstrcat(buf, sizeof(buf), ";qXfer:features:read+");
1129 }
1130 put_packet(s, buf);
1131 break;
1132 }
1133 if (strncmp(p, "Xfer:features:read:", 19) == 0) {
1134 const char *xml;
1135 target_ulong total_len;
1136
1137 cc = CPU_GET_CLASS(first_cpu);
1138 if (cc->gdb_core_xml_file == NULL) {
1139 goto unknown_command;
1140 }
1141
1142 gdb_has_xml = true;
1143 p += 19;
1144 xml = get_feature_xml(p, &p, cc);
1145 if (!xml) {
1146 snprintf(buf, sizeof(buf), "E00");
1147 put_packet(s, buf);
1148 break;
1149 }
1150
1151 if (*p == ':')
1152 p++;
1153 addr = strtoul(p, (char **)&p, 16);
1154 if (*p == ',')
1155 p++;
1156 len = strtoul(p, (char **)&p, 16);
1157
1158 total_len = strlen(xml);
1159 if (addr > total_len) {
1160 snprintf(buf, sizeof(buf), "E00");
1161 put_packet(s, buf);
1162 break;
1163 }
1164 if (len > (MAX_PACKET_LENGTH - 5) / 2)
1165 len = (MAX_PACKET_LENGTH - 5) / 2;
1166 if (len < total_len - addr) {
1167 buf[0] = 'm';
1168 len = memtox(buf + 1, xml + addr, len);
1169 } else {
1170 buf[0] = 'l';
1171 len = memtox(buf + 1, xml + addr, total_len - addr);
1172 }
1173 put_packet_binary(s, buf, len + 1);
1174 break;
1175 }
1176 /* Unrecognised 'q' command. */
1177 goto unknown_command;
1178
1179 default:
1180 unknown_command:
1181 /* put empty packet */
1182 buf[0] = '\0';
1183 put_packet(s, buf);
1184 break;
1185 }
1186 return RS_IDLE;
1187 }
1188
1189 void gdb_set_stop_cpu(CPUState *cpu)
1190 {
1191 gdbserver_state->c_cpu = cpu;
1192 gdbserver_state->g_cpu = cpu;
1193 }
1194
1195 #ifndef CONFIG_USER_ONLY
1196 static void gdb_vm_state_change(void *opaque, int running, RunState state)
1197 {
1198 GDBState *s = gdbserver_state;
1199 CPUArchState *env = s->c_cpu->env_ptr;
1200 CPUState *cpu = s->c_cpu;
1201 char buf[256];
1202 const char *type;
1203 int ret;
1204
1205 if (running || s->state == RS_INACTIVE) {
1206 return;
1207 }
1208 /* Is there a GDB syscall waiting to be sent? */
1209 if (s->current_syscall_cb) {
1210 put_packet(s, s->syscall_buf);
1211 return;
1212 }
1213 switch (state) {
1214 case RUN_STATE_DEBUG:
1215 if (cpu->watchpoint_hit) {
1216 switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) {
1217 case BP_MEM_READ:
1218 type = "r";
1219 break;
1220 case BP_MEM_ACCESS:
1221 type = "a";
1222 break;
1223 default:
1224 type = "";
1225 break;
1226 }
1227 snprintf(buf, sizeof(buf),
1228 "T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";",
1229 GDB_SIGNAL_TRAP, cpu_index(cpu), type,
1230 (target_ulong)cpu->watchpoint_hit->vaddr);
1231 cpu->watchpoint_hit = NULL;
1232 goto send_packet;
1233 }
1234 tb_flush(env);
1235 ret = GDB_SIGNAL_TRAP;
1236 break;
1237 case RUN_STATE_PAUSED:
1238 ret = GDB_SIGNAL_INT;
1239 break;
1240 case RUN_STATE_SHUTDOWN:
1241 ret = GDB_SIGNAL_QUIT;
1242 break;
1243 case RUN_STATE_IO_ERROR:
1244 ret = GDB_SIGNAL_IO;
1245 break;
1246 case RUN_STATE_WATCHDOG:
1247 ret = GDB_SIGNAL_ALRM;
1248 break;
1249 case RUN_STATE_INTERNAL_ERROR:
1250 ret = GDB_SIGNAL_ABRT;
1251 break;
1252 case RUN_STATE_SAVE_VM:
1253 case RUN_STATE_RESTORE_VM:
1254 return;
1255 case RUN_STATE_FINISH_MIGRATE:
1256 ret = GDB_SIGNAL_XCPU;
1257 break;
1258 default:
1259 ret = GDB_SIGNAL_UNKNOWN;
1260 break;
1261 }
1262 snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, cpu_index(cpu));
1263
1264 send_packet:
1265 put_packet(s, buf);
1266
1267 /* disable single step if it was enabled */
1268 cpu_single_step(cpu, 0);
1269 }
1270 #endif
1271
1272 /* Send a gdb syscall request.
1273 This accepts limited printf-style format specifiers, specifically:
1274 %x - target_ulong argument printed in hex.
1275 %lx - 64-bit argument printed in hex.
1276 %s - string pointer (target_ulong) and length (int) pair. */
1277 void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...)
1278 {
1279 va_list va;
1280 char *p;
1281 char *p_end;
1282 target_ulong addr;
1283 uint64_t i64;
1284 GDBState *s;
1285
1286 s = gdbserver_state;
1287 if (!s)
1288 return;
1289 s->current_syscall_cb = cb;
1290 #ifndef CONFIG_USER_ONLY
1291 vm_stop(RUN_STATE_DEBUG);
1292 #endif
1293 va_start(va, fmt);
1294 p = s->syscall_buf;
1295 p_end = &s->syscall_buf[sizeof(s->syscall_buf)];
1296 *(p++) = 'F';
1297 while (*fmt) {
1298 if (*fmt == '%') {
1299 fmt++;
1300 switch (*fmt++) {
1301 case 'x':
1302 addr = va_arg(va, target_ulong);
1303 p += snprintf(p, p_end - p, TARGET_FMT_lx, addr);
1304 break;
1305 case 'l':
1306 if (*(fmt++) != 'x')
1307 goto bad_format;
1308 i64 = va_arg(va, uint64_t);
1309 p += snprintf(p, p_end - p, "%" PRIx64, i64);
1310 break;
1311 case 's':
1312 addr = va_arg(va, target_ulong);
1313 p += snprintf(p, p_end - p, TARGET_FMT_lx "/%x",
1314 addr, va_arg(va, int));
1315 break;
1316 default:
1317 bad_format:
1318 fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n",
1319 fmt - 1);
1320 break;
1321 }
1322 } else {
1323 *(p++) = *(fmt++);
1324 }
1325 }
1326 *p = 0;
1327 va_end(va);
1328 #ifdef CONFIG_USER_ONLY
1329 put_packet(s, s->syscall_buf);
1330 gdb_handlesig(s->c_cpu, 0);
1331 #else
1332 /* In this case wait to send the syscall packet until notification that
1333 the CPU has stopped. This must be done because if the packet is sent
1334 now the reply from the syscall request could be received while the CPU
1335 is still in the running state, which can cause packets to be dropped
1336 and state transition 'T' packets to be sent while the syscall is still
1337 being processed. */
1338 cpu_exit(s->c_cpu);
1339 #endif
1340 }
1341
1342 static void gdb_read_byte(GDBState *s, int ch)
1343 {
1344 int i, csum;
1345 uint8_t reply;
1346
1347 #ifndef CONFIG_USER_ONLY
1348 if (s->last_packet_len) {
1349 /* Waiting for a response to the last packet. If we see the start
1350 of a new command then abandon the previous response. */
1351 if (ch == '-') {
1352 #ifdef DEBUG_GDB
1353 printf("Got NACK, retransmitting\n");
1354 #endif
1355 put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
1356 }
1357 #ifdef DEBUG_GDB
1358 else if (ch == '+')
1359 printf("Got ACK\n");
1360 else
1361 printf("Got '%c' when expecting ACK/NACK\n", ch);
1362 #endif
1363 if (ch == '+' || ch == '$')
1364 s->last_packet_len = 0;
1365 if (ch != '$')
1366 return;
1367 }
1368 if (runstate_is_running()) {
1369 /* when the CPU is running, we cannot do anything except stop
1370 it when receiving a char */
1371 vm_stop(RUN_STATE_PAUSED);
1372 } else
1373 #endif
1374 {
1375 switch(s->state) {
1376 case RS_IDLE:
1377 if (ch == '$') {
1378 s->line_buf_index = 0;
1379 s->state = RS_GETLINE;
1380 }
1381 break;
1382 case RS_GETLINE:
1383 if (ch == '#') {
1384 s->state = RS_CHKSUM1;
1385 } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
1386 s->state = RS_IDLE;
1387 } else {
1388 s->line_buf[s->line_buf_index++] = ch;
1389 }
1390 break;
1391 case RS_CHKSUM1:
1392 s->line_buf[s->line_buf_index] = '\0';
1393 s->line_csum = fromhex(ch) << 4;
1394 s->state = RS_CHKSUM2;
1395 break;
1396 case RS_CHKSUM2:
1397 s->line_csum |= fromhex(ch);
1398 csum = 0;
1399 for(i = 0; i < s->line_buf_index; i++) {
1400 csum += s->line_buf[i];
1401 }
1402 if (s->line_csum != (csum & 0xff)) {
1403 reply = '-';
1404 put_buffer(s, &reply, 1);
1405 s->state = RS_IDLE;
1406 } else {
1407 reply = '+';
1408 put_buffer(s, &reply, 1);
1409 s->state = gdb_handle_packet(s, s->line_buf);
1410 }
1411 break;
1412 default:
1413 abort();
1414 }
1415 }
1416 }
1417
1418 /* Tell the remote gdb that the process has exited. */
1419 void gdb_exit(CPUArchState *env, int code)
1420 {
1421 GDBState *s;
1422 char buf[4];
1423
1424 s = gdbserver_state;
1425 if (!s) {
1426 return;
1427 }
1428 #ifdef CONFIG_USER_ONLY
1429 if (gdbserver_fd < 0 || s->fd < 0) {
1430 return;
1431 }
1432 #endif
1433
1434 snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
1435 put_packet(s, buf);
1436
1437 #ifndef CONFIG_USER_ONLY
1438 if (s->chr) {
1439 qemu_chr_delete(s->chr);
1440 }
1441 #endif
1442 }
1443
1444 #ifdef CONFIG_USER_ONLY
1445 int
1446 gdb_queuesig (void)
1447 {
1448 GDBState *s;
1449
1450 s = gdbserver_state;
1451
1452 if (gdbserver_fd < 0 || s->fd < 0)
1453 return 0;
1454 else
1455 return 1;
1456 }
1457
1458 int
1459 gdb_handlesig(CPUState *cpu, int sig)
1460 {
1461 CPUArchState *env = cpu->env_ptr;
1462 GDBState *s;
1463 char buf[256];
1464 int n;
1465
1466 s = gdbserver_state;
1467 if (gdbserver_fd < 0 || s->fd < 0) {
1468 return sig;
1469 }
1470
1471 /* disable single step if it was enabled */
1472 cpu_single_step(cpu, 0);
1473 tb_flush(env);
1474
1475 if (sig != 0) {
1476 snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb(sig));
1477 put_packet(s, buf);
1478 }
1479 /* put_packet() might have detected that the peer terminated the
1480 connection. */
1481 if (s->fd < 0) {
1482 return sig;
1483 }
1484
1485 sig = 0;
1486 s->state = RS_IDLE;
1487 s->running_state = 0;
1488 while (s->running_state == 0) {
1489 n = read(s->fd, buf, 256);
1490 if (n > 0) {
1491 int i;
1492
1493 for (i = 0; i < n; i++) {
1494 gdb_read_byte(s, buf[i]);
1495 }
1496 } else if (n == 0 || errno != EAGAIN) {
1497 /* XXX: Connection closed. Should probably wait for another
1498 connection before continuing. */
1499 return sig;
1500 }
1501 }
1502 sig = s->signal;
1503 s->signal = 0;
1504 return sig;
1505 }
1506
1507 /* Tell the remote gdb that the process has exited due to SIG. */
1508 void gdb_signalled(CPUArchState *env, int sig)
1509 {
1510 GDBState *s;
1511 char buf[4];
1512
1513 s = gdbserver_state;
1514 if (gdbserver_fd < 0 || s->fd < 0) {
1515 return;
1516 }
1517
1518 snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb(sig));
1519 put_packet(s, buf);
1520 }
1521
1522 static void gdb_accept(void)
1523 {
1524 GDBState *s;
1525 struct sockaddr_in sockaddr;
1526 socklen_t len;
1527 int fd;
1528
1529 for(;;) {
1530 len = sizeof(sockaddr);
1531 fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
1532 if (fd < 0 && errno != EINTR) {
1533 perror("accept");
1534 return;
1535 } else if (fd >= 0) {
1536 #ifndef _WIN32
1537 fcntl(fd, F_SETFD, FD_CLOEXEC);
1538 #endif
1539 break;
1540 }
1541 }
1542
1543 /* set short latency */
1544 socket_set_nodelay(fd);
1545
1546 s = g_malloc0(sizeof(GDBState));
1547 s->c_cpu = first_cpu;
1548 s->g_cpu = first_cpu;
1549 s->fd = fd;
1550 gdb_has_xml = false;
1551
1552 gdbserver_state = s;
1553
1554 fcntl(fd, F_SETFL, O_NONBLOCK);
1555 }
1556
1557 static int gdbserver_open(int port)
1558 {
1559 struct sockaddr_in sockaddr;
1560 int fd, ret;
1561
1562 fd = socket(PF_INET, SOCK_STREAM, 0);
1563 if (fd < 0) {
1564 perror("socket");
1565 return -1;
1566 }
1567 #ifndef _WIN32
1568 fcntl(fd, F_SETFD, FD_CLOEXEC);
1569 #endif
1570
1571 socket_set_fast_reuse(fd);
1572
1573 sockaddr.sin_family = AF_INET;
1574 sockaddr.sin_port = htons(port);
1575 sockaddr.sin_addr.s_addr = 0;
1576 ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
1577 if (ret < 0) {
1578 perror("bind");
1579 close(fd);
1580 return -1;
1581 }
1582 ret = listen(fd, 0);
1583 if (ret < 0) {
1584 perror("listen");
1585 close(fd);
1586 return -1;
1587 }
1588 return fd;
1589 }
1590
1591 int gdbserver_start(int port)
1592 {
1593 gdbserver_fd = gdbserver_open(port);
1594 if (gdbserver_fd < 0)
1595 return -1;
1596 /* accept connections */
1597 gdb_accept();
1598 return 0;
1599 }
1600
1601 /* Disable gdb stub for child processes. */
1602 void gdbserver_fork(CPUArchState *env)
1603 {
1604 CPUState *cpu = ENV_GET_CPU(env);
1605 GDBState *s = gdbserver_state;
1606
1607 if (gdbserver_fd < 0 || s->fd < 0) {
1608 return;
1609 }
1610 close(s->fd);
1611 s->fd = -1;
1612 cpu_breakpoint_remove_all(cpu, BP_GDB);
1613 cpu_watchpoint_remove_all(cpu, BP_GDB);
1614 }
1615 #else
1616 static int gdb_chr_can_receive(void *opaque)
1617 {
1618 /* We can handle an arbitrarily large amount of data.
1619 Pick the maximum packet size, which is as good as anything. */
1620 return MAX_PACKET_LENGTH;
1621 }
1622
1623 static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size)
1624 {
1625 int i;
1626
1627 for (i = 0; i < size; i++) {
1628 gdb_read_byte(gdbserver_state, buf[i]);
1629 }
1630 }
1631
1632 static void gdb_chr_event(void *opaque, int event)
1633 {
1634 switch (event) {
1635 case CHR_EVENT_OPENED:
1636 vm_stop(RUN_STATE_PAUSED);
1637 gdb_has_xml = false;
1638 break;
1639 default:
1640 break;
1641 }
1642 }
1643
1644 static void gdb_monitor_output(GDBState *s, const char *msg, int len)
1645 {
1646 char buf[MAX_PACKET_LENGTH];
1647
1648 buf[0] = 'O';
1649 if (len > (MAX_PACKET_LENGTH/2) - 1)
1650 len = (MAX_PACKET_LENGTH/2) - 1;
1651 memtohex(buf + 1, (uint8_t *)msg, len);
1652 put_packet(s, buf);
1653 }
1654
1655 static int gdb_monitor_write(CharDriverState *chr, const uint8_t *buf, int len)
1656 {
1657 const char *p = (const char *)buf;
1658 int max_sz;
1659
1660 max_sz = (sizeof(gdbserver_state->last_packet) - 2) / 2;
1661 for (;;) {
1662 if (len <= max_sz) {
1663 gdb_monitor_output(gdbserver_state, p, len);
1664 break;
1665 }
1666 gdb_monitor_output(gdbserver_state, p, max_sz);
1667 p += max_sz;
1668 len -= max_sz;
1669 }
1670 return len;
1671 }
1672
1673 #ifndef _WIN32
1674 static void gdb_sigterm_handler(int signal)
1675 {
1676 if (runstate_is_running()) {
1677 vm_stop(RUN_STATE_PAUSED);
1678 }
1679 }
1680 #endif
1681
1682 int gdbserver_start(const char *device)
1683 {
1684 GDBState *s;
1685 char gdbstub_device_name[128];
1686 CharDriverState *chr = NULL;
1687 CharDriverState *mon_chr;
1688
1689 if (!device)
1690 return -1;
1691 if (strcmp(device, "none") != 0) {
1692 if (strstart(device, "tcp:", NULL)) {
1693 /* enforce required TCP attributes */
1694 snprintf(gdbstub_device_name, sizeof(gdbstub_device_name),
1695 "%s,nowait,nodelay,server", device);
1696 device = gdbstub_device_name;
1697 }
1698 #ifndef _WIN32
1699 else if (strcmp(device, "stdio") == 0) {
1700 struct sigaction act;
1701
1702 memset(&act, 0, sizeof(act));
1703 act.sa_handler = gdb_sigterm_handler;
1704 sigaction(SIGINT, &act, NULL);
1705 }
1706 #endif
1707 chr = qemu_chr_new("gdb", device, NULL);
1708 if (!chr)
1709 return -1;
1710
1711 qemu_chr_fe_claim_no_fail(chr);
1712 qemu_chr_add_handlers(chr, gdb_chr_can_receive, gdb_chr_receive,
1713 gdb_chr_event, NULL);
1714 }
1715
1716 s = gdbserver_state;
1717 if (!s) {
1718 s = g_malloc0(sizeof(GDBState));
1719 gdbserver_state = s;
1720
1721 qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL);
1722
1723 /* Initialize a monitor terminal for gdb */
1724 mon_chr = qemu_chr_alloc();
1725 mon_chr->chr_write = gdb_monitor_write;
1726 monitor_init(mon_chr, 0);
1727 } else {
1728 if (s->chr)
1729 qemu_chr_delete(s->chr);
1730 mon_chr = s->mon_chr;
1731 memset(s, 0, sizeof(GDBState));
1732 }
1733 s->c_cpu = first_cpu;
1734 s->g_cpu = first_cpu;
1735 s->chr = chr;
1736 s->state = chr ? RS_IDLE : RS_INACTIVE;
1737 s->mon_chr = mon_chr;
1738 s->current_syscall_cb = NULL;
1739
1740 return 0;
1741 }
1742 #endif