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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 "qemu/osdep.h" | |
20 | #include "qapi/error.h" | |
21 | #include "qemu/error-report.h" | |
22 | #include "qemu/cutils.h" | |
23 | #include "cpu.h" | |
24 | #ifdef CONFIG_USER_ONLY | |
25 | #include "qemu.h" | |
26 | #else | |
27 | #include "monitor/monitor.h" | |
28 | #include "sysemu/char.h" | |
29 | #include "sysemu/sysemu.h" | |
30 | #include "exec/gdbstub.h" | |
31 | #endif | |
32 | ||
33 | #define MAX_PACKET_LENGTH 4096 | |
34 | ||
35 | #include "qemu/sockets.h" | |
36 | #include "sysemu/hw_accel.h" | |
37 | #include "sysemu/kvm.h" | |
38 | #include "exec/semihost.h" | |
39 | #include "exec/exec-all.h" | |
40 | ||
41 | #ifdef CONFIG_USER_ONLY | |
42 | #define GDB_ATTACHED "0" | |
43 | #else | |
44 | #define GDB_ATTACHED "1" | |
45 | #endif | |
46 | ||
47 | static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr, | |
48 | uint8_t *buf, int len, bool is_write) | |
49 | { | |
50 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
51 | ||
52 | if (cc->memory_rw_debug) { | |
53 | return cc->memory_rw_debug(cpu, addr, buf, len, is_write); | |
54 | } | |
55 | return cpu_memory_rw_debug(cpu, addr, buf, len, is_write); | |
56 | } | |
57 | ||
58 | enum { | |
59 | GDB_SIGNAL_0 = 0, | |
60 | GDB_SIGNAL_INT = 2, | |
61 | GDB_SIGNAL_QUIT = 3, | |
62 | GDB_SIGNAL_TRAP = 5, | |
63 | GDB_SIGNAL_ABRT = 6, | |
64 | GDB_SIGNAL_ALRM = 14, | |
65 | GDB_SIGNAL_IO = 23, | |
66 | GDB_SIGNAL_XCPU = 24, | |
67 | GDB_SIGNAL_UNKNOWN = 143 | |
68 | }; | |
69 | ||
70 | #ifdef CONFIG_USER_ONLY | |
71 | ||
72 | /* Map target signal numbers to GDB protocol signal numbers and vice | |
73 | * versa. For user emulation's currently supported systems, we can | |
74 | * assume most signals are defined. | |
75 | */ | |
76 | ||
77 | static int gdb_signal_table[] = { | |
78 | 0, | |
79 | TARGET_SIGHUP, | |
80 | TARGET_SIGINT, | |
81 | TARGET_SIGQUIT, | |
82 | TARGET_SIGILL, | |
83 | TARGET_SIGTRAP, | |
84 | TARGET_SIGABRT, | |
85 | -1, /* SIGEMT */ | |
86 | TARGET_SIGFPE, | |
87 | TARGET_SIGKILL, | |
88 | TARGET_SIGBUS, | |
89 | TARGET_SIGSEGV, | |
90 | TARGET_SIGSYS, | |
91 | TARGET_SIGPIPE, | |
92 | TARGET_SIGALRM, | |
93 | TARGET_SIGTERM, | |
94 | TARGET_SIGURG, | |
95 | TARGET_SIGSTOP, | |
96 | TARGET_SIGTSTP, | |
97 | TARGET_SIGCONT, | |
98 | TARGET_SIGCHLD, | |
99 | TARGET_SIGTTIN, | |
100 | TARGET_SIGTTOU, | |
101 | TARGET_SIGIO, | |
102 | TARGET_SIGXCPU, | |
103 | TARGET_SIGXFSZ, | |
104 | TARGET_SIGVTALRM, | |
105 | TARGET_SIGPROF, | |
106 | TARGET_SIGWINCH, | |
107 | -1, /* SIGLOST */ | |
108 | TARGET_SIGUSR1, | |
109 | TARGET_SIGUSR2, | |
110 | #ifdef TARGET_SIGPWR | |
111 | TARGET_SIGPWR, | |
112 | #else | |
113 | -1, | |
114 | #endif | |
115 | -1, /* SIGPOLL */ | |
116 | -1, | |
117 | -1, | |
118 | -1, | |
119 | -1, | |
120 | -1, | |
121 | -1, | |
122 | -1, | |
123 | -1, | |
124 | -1, | |
125 | -1, | |
126 | -1, | |
127 | #ifdef __SIGRTMIN | |
128 | __SIGRTMIN + 1, | |
129 | __SIGRTMIN + 2, | |
130 | __SIGRTMIN + 3, | |
131 | __SIGRTMIN + 4, | |
132 | __SIGRTMIN + 5, | |
133 | __SIGRTMIN + 6, | |
134 | __SIGRTMIN + 7, | |
135 | __SIGRTMIN + 8, | |
136 | __SIGRTMIN + 9, | |
137 | __SIGRTMIN + 10, | |
138 | __SIGRTMIN + 11, | |
139 | __SIGRTMIN + 12, | |
140 | __SIGRTMIN + 13, | |
141 | __SIGRTMIN + 14, | |
142 | __SIGRTMIN + 15, | |
143 | __SIGRTMIN + 16, | |
144 | __SIGRTMIN + 17, | |
145 | __SIGRTMIN + 18, | |
146 | __SIGRTMIN + 19, | |
147 | __SIGRTMIN + 20, | |
148 | __SIGRTMIN + 21, | |
149 | __SIGRTMIN + 22, | |
150 | __SIGRTMIN + 23, | |
151 | __SIGRTMIN + 24, | |
152 | __SIGRTMIN + 25, | |
153 | __SIGRTMIN + 26, | |
154 | __SIGRTMIN + 27, | |
155 | __SIGRTMIN + 28, | |
156 | __SIGRTMIN + 29, | |
157 | __SIGRTMIN + 30, | |
158 | __SIGRTMIN + 31, | |
159 | -1, /* SIGCANCEL */ | |
160 | __SIGRTMIN, | |
161 | __SIGRTMIN + 32, | |
162 | __SIGRTMIN + 33, | |
163 | __SIGRTMIN + 34, | |
164 | __SIGRTMIN + 35, | |
165 | __SIGRTMIN + 36, | |
166 | __SIGRTMIN + 37, | |
167 | __SIGRTMIN + 38, | |
168 | __SIGRTMIN + 39, | |
169 | __SIGRTMIN + 40, | |
170 | __SIGRTMIN + 41, | |
171 | __SIGRTMIN + 42, | |
172 | __SIGRTMIN + 43, | |
173 | __SIGRTMIN + 44, | |
174 | __SIGRTMIN + 45, | |
175 | __SIGRTMIN + 46, | |
176 | __SIGRTMIN + 47, | |
177 | __SIGRTMIN + 48, | |
178 | __SIGRTMIN + 49, | |
179 | __SIGRTMIN + 50, | |
180 | __SIGRTMIN + 51, | |
181 | __SIGRTMIN + 52, | |
182 | __SIGRTMIN + 53, | |
183 | __SIGRTMIN + 54, | |
184 | __SIGRTMIN + 55, | |
185 | __SIGRTMIN + 56, | |
186 | __SIGRTMIN + 57, | |
187 | __SIGRTMIN + 58, | |
188 | __SIGRTMIN + 59, | |
189 | __SIGRTMIN + 60, | |
190 | __SIGRTMIN + 61, | |
191 | __SIGRTMIN + 62, | |
192 | __SIGRTMIN + 63, | |
193 | __SIGRTMIN + 64, | |
194 | __SIGRTMIN + 65, | |
195 | __SIGRTMIN + 66, | |
196 | __SIGRTMIN + 67, | |
197 | __SIGRTMIN + 68, | |
198 | __SIGRTMIN + 69, | |
199 | __SIGRTMIN + 70, | |
200 | __SIGRTMIN + 71, | |
201 | __SIGRTMIN + 72, | |
202 | __SIGRTMIN + 73, | |
203 | __SIGRTMIN + 74, | |
204 | __SIGRTMIN + 75, | |
205 | __SIGRTMIN + 76, | |
206 | __SIGRTMIN + 77, | |
207 | __SIGRTMIN + 78, | |
208 | __SIGRTMIN + 79, | |
209 | __SIGRTMIN + 80, | |
210 | __SIGRTMIN + 81, | |
211 | __SIGRTMIN + 82, | |
212 | __SIGRTMIN + 83, | |
213 | __SIGRTMIN + 84, | |
214 | __SIGRTMIN + 85, | |
215 | __SIGRTMIN + 86, | |
216 | __SIGRTMIN + 87, | |
217 | __SIGRTMIN + 88, | |
218 | __SIGRTMIN + 89, | |
219 | __SIGRTMIN + 90, | |
220 | __SIGRTMIN + 91, | |
221 | __SIGRTMIN + 92, | |
222 | __SIGRTMIN + 93, | |
223 | __SIGRTMIN + 94, | |
224 | __SIGRTMIN + 95, | |
225 | -1, /* SIGINFO */ | |
226 | -1, /* UNKNOWN */ | |
227 | -1, /* DEFAULT */ | |
228 | -1, | |
229 | -1, | |
230 | -1, | |
231 | -1, | |
232 | -1, | |
233 | -1 | |
234 | #endif | |
235 | }; | |
236 | #else | |
237 | /* In system mode we only need SIGINT and SIGTRAP; other signals | |
238 | are not yet supported. */ | |
239 | ||
240 | enum { | |
241 | TARGET_SIGINT = 2, | |
242 | TARGET_SIGTRAP = 5 | |
243 | }; | |
244 | ||
245 | static int gdb_signal_table[] = { | |
246 | -1, | |
247 | -1, | |
248 | TARGET_SIGINT, | |
249 | -1, | |
250 | -1, | |
251 | TARGET_SIGTRAP | |
252 | }; | |
253 | #endif | |
254 | ||
255 | #ifdef CONFIG_USER_ONLY | |
256 | static int target_signal_to_gdb (int sig) | |
257 | { | |
258 | int i; | |
259 | for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++) | |
260 | if (gdb_signal_table[i] == sig) | |
261 | return i; | |
262 | return GDB_SIGNAL_UNKNOWN; | |
263 | } | |
264 | #endif | |
265 | ||
266 | static int gdb_signal_to_target (int sig) | |
267 | { | |
268 | if (sig < ARRAY_SIZE (gdb_signal_table)) | |
269 | return gdb_signal_table[sig]; | |
270 | else | |
271 | return -1; | |
272 | } | |
273 | ||
274 | //#define DEBUG_GDB | |
275 | ||
276 | typedef struct GDBRegisterState { | |
277 | int base_reg; | |
278 | int num_regs; | |
279 | gdb_reg_cb get_reg; | |
280 | gdb_reg_cb set_reg; | |
281 | const char *xml; | |
282 | struct GDBRegisterState *next; | |
283 | } GDBRegisterState; | |
284 | ||
285 | enum RSState { | |
286 | RS_INACTIVE, | |
287 | RS_IDLE, | |
288 | RS_GETLINE, | |
289 | RS_CHKSUM1, | |
290 | RS_CHKSUM2, | |
291 | }; | |
292 | typedef struct GDBState { | |
293 | CPUState *c_cpu; /* current CPU for step/continue ops */ | |
294 | CPUState *g_cpu; /* current CPU for other ops */ | |
295 | CPUState *query_cpu; /* for q{f|s}ThreadInfo */ | |
296 | enum RSState state; /* parsing state */ | |
297 | char line_buf[MAX_PACKET_LENGTH]; | |
298 | int line_buf_index; | |
299 | int line_csum; | |
300 | uint8_t last_packet[MAX_PACKET_LENGTH + 4]; | |
301 | int last_packet_len; | |
302 | int signal; | |
303 | #ifdef CONFIG_USER_ONLY | |
304 | int fd; | |
305 | int running_state; | |
306 | #else | |
307 | CharBackend chr; | |
308 | Chardev *mon_chr; | |
309 | #endif | |
310 | char syscall_buf[256]; | |
311 | gdb_syscall_complete_cb current_syscall_cb; | |
312 | } GDBState; | |
313 | ||
314 | /* By default use no IRQs and no timers while single stepping so as to | |
315 | * make single stepping like an ICE HW step. | |
316 | */ | |
317 | static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER; | |
318 | ||
319 | static GDBState *gdbserver_state; | |
320 | ||
321 | bool gdb_has_xml; | |
322 | ||
323 | #ifdef CONFIG_USER_ONLY | |
324 | /* XXX: This is not thread safe. Do we care? */ | |
325 | static int gdbserver_fd = -1; | |
326 | ||
327 | static int get_char(GDBState *s) | |
328 | { | |
329 | uint8_t ch; | |
330 | int ret; | |
331 | ||
332 | for(;;) { | |
333 | ret = qemu_recv(s->fd, &ch, 1, 0); | |
334 | if (ret < 0) { | |
335 | if (errno == ECONNRESET) | |
336 | s->fd = -1; | |
337 | if (errno != EINTR) | |
338 | return -1; | |
339 | } else if (ret == 0) { | |
340 | close(s->fd); | |
341 | s->fd = -1; | |
342 | return -1; | |
343 | } else { | |
344 | break; | |
345 | } | |
346 | } | |
347 | return ch; | |
348 | } | |
349 | #endif | |
350 | ||
351 | static enum { | |
352 | GDB_SYS_UNKNOWN, | |
353 | GDB_SYS_ENABLED, | |
354 | GDB_SYS_DISABLED, | |
355 | } gdb_syscall_mode; | |
356 | ||
357 | /* Decide if either remote gdb syscalls or native file IO should be used. */ | |
358 | int use_gdb_syscalls(void) | |
359 | { | |
360 | SemihostingTarget target = semihosting_get_target(); | |
361 | if (target == SEMIHOSTING_TARGET_NATIVE) { | |
362 | /* -semihosting-config target=native */ | |
363 | return false; | |
364 | } else if (target == SEMIHOSTING_TARGET_GDB) { | |
365 | /* -semihosting-config target=gdb */ | |
366 | return true; | |
367 | } | |
368 | ||
369 | /* -semihosting-config target=auto */ | |
370 | /* On the first call check if gdb is connected and remember. */ | |
371 | if (gdb_syscall_mode == GDB_SYS_UNKNOWN) { | |
372 | gdb_syscall_mode = (gdbserver_state ? GDB_SYS_ENABLED | |
373 | : GDB_SYS_DISABLED); | |
374 | } | |
375 | return gdb_syscall_mode == GDB_SYS_ENABLED; | |
376 | } | |
377 | ||
378 | /* Resume execution. */ | |
379 | static inline void gdb_continue(GDBState *s) | |
380 | { | |
381 | #ifdef CONFIG_USER_ONLY | |
382 | s->running_state = 1; | |
383 | #else | |
384 | if (!runstate_needs_reset()) { | |
385 | vm_start(); | |
386 | } | |
387 | #endif | |
388 | } | |
389 | ||
390 | /* | |
391 | * Resume execution, per CPU actions. For user-mode emulation it's | |
392 | * equivalent to gdb_continue. | |
393 | */ | |
394 | static int gdb_continue_partial(GDBState *s, char *newstates) | |
395 | { | |
396 | CPUState *cpu; | |
397 | int res = 0; | |
398 | #ifdef CONFIG_USER_ONLY | |
399 | /* | |
400 | * This is not exactly accurate, but it's an improvement compared to the | |
401 | * previous situation, where only one CPU would be single-stepped. | |
402 | */ | |
403 | CPU_FOREACH(cpu) { | |
404 | if (newstates[cpu->cpu_index] == 's') { | |
405 | cpu_single_step(cpu, sstep_flags); | |
406 | } | |
407 | } | |
408 | s->running_state = 1; | |
409 | #else | |
410 | int flag = 0; | |
411 | ||
412 | if (!runstate_needs_reset()) { | |
413 | if (vm_prepare_start()) { | |
414 | return 0; | |
415 | } | |
416 | ||
417 | CPU_FOREACH(cpu) { | |
418 | switch (newstates[cpu->cpu_index]) { | |
419 | case 0: | |
420 | case 1: | |
421 | break; /* nothing to do here */ | |
422 | case 's': | |
423 | cpu_single_step(cpu, sstep_flags); | |
424 | cpu_resume(cpu); | |
425 | flag = 1; | |
426 | break; | |
427 | case 'c': | |
428 | cpu_resume(cpu); | |
429 | flag = 1; | |
430 | break; | |
431 | default: | |
432 | res = -1; | |
433 | break; | |
434 | } | |
435 | } | |
436 | } | |
437 | if (flag) { | |
438 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true); | |
439 | } | |
440 | #endif | |
441 | return res; | |
442 | } | |
443 | ||
444 | static void put_buffer(GDBState *s, const uint8_t *buf, int len) | |
445 | { | |
446 | #ifdef CONFIG_USER_ONLY | |
447 | int ret; | |
448 | ||
449 | while (len > 0) { | |
450 | ret = send(s->fd, buf, len, 0); | |
451 | if (ret < 0) { | |
452 | if (errno != EINTR) | |
453 | return; | |
454 | } else { | |
455 | buf += ret; | |
456 | len -= ret; | |
457 | } | |
458 | } | |
459 | #else | |
460 | /* XXX this blocks entire thread. Rewrite to use | |
461 | * qemu_chr_fe_write and background I/O callbacks */ | |
462 | qemu_chr_fe_write_all(&s->chr, buf, len); | |
463 | #endif | |
464 | } | |
465 | ||
466 | static inline int fromhex(int v) | |
467 | { | |
468 | if (v >= '0' && v <= '9') | |
469 | return v - '0'; | |
470 | else if (v >= 'A' && v <= 'F') | |
471 | return v - 'A' + 10; | |
472 | else if (v >= 'a' && v <= 'f') | |
473 | return v - 'a' + 10; | |
474 | else | |
475 | return 0; | |
476 | } | |
477 | ||
478 | static inline int tohex(int v) | |
479 | { | |
480 | if (v < 10) | |
481 | return v + '0'; | |
482 | else | |
483 | return v - 10 + 'a'; | |
484 | } | |
485 | ||
486 | static void memtohex(char *buf, const uint8_t *mem, int len) | |
487 | { | |
488 | int i, c; | |
489 | char *q; | |
490 | q = buf; | |
491 | for(i = 0; i < len; i++) { | |
492 | c = mem[i]; | |
493 | *q++ = tohex(c >> 4); | |
494 | *q++ = tohex(c & 0xf); | |
495 | } | |
496 | *q = '\0'; | |
497 | } | |
498 | ||
499 | static void hextomem(uint8_t *mem, const char *buf, int len) | |
500 | { | |
501 | int i; | |
502 | ||
503 | for(i = 0; i < len; i++) { | |
504 | mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]); | |
505 | buf += 2; | |
506 | } | |
507 | } | |
508 | ||
509 | /* return -1 if error, 0 if OK */ | |
510 | static int put_packet_binary(GDBState *s, const char *buf, int len) | |
511 | { | |
512 | int csum, i; | |
513 | uint8_t *p; | |
514 | ||
515 | for(;;) { | |
516 | p = s->last_packet; | |
517 | *(p++) = '$'; | |
518 | memcpy(p, buf, len); | |
519 | p += len; | |
520 | csum = 0; | |
521 | for(i = 0; i < len; i++) { | |
522 | csum += buf[i]; | |
523 | } | |
524 | *(p++) = '#'; | |
525 | *(p++) = tohex((csum >> 4) & 0xf); | |
526 | *(p++) = tohex((csum) & 0xf); | |
527 | ||
528 | s->last_packet_len = p - s->last_packet; | |
529 | put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); | |
530 | ||
531 | #ifdef CONFIG_USER_ONLY | |
532 | i = get_char(s); | |
533 | if (i < 0) | |
534 | return -1; | |
535 | if (i == '+') | |
536 | break; | |
537 | #else | |
538 | break; | |
539 | #endif | |
540 | } | |
541 | return 0; | |
542 | } | |
543 | ||
544 | /* return -1 if error, 0 if OK */ | |
545 | static int put_packet(GDBState *s, const char *buf) | |
546 | { | |
547 | #ifdef DEBUG_GDB | |
548 | printf("reply='%s'\n", buf); | |
549 | #endif | |
550 | ||
551 | return put_packet_binary(s, buf, strlen(buf)); | |
552 | } | |
553 | ||
554 | /* Encode data using the encoding for 'x' packets. */ | |
555 | static int memtox(char *buf, const char *mem, int len) | |
556 | { | |
557 | char *p = buf; | |
558 | char c; | |
559 | ||
560 | while (len--) { | |
561 | c = *(mem++); | |
562 | switch (c) { | |
563 | case '#': case '$': case '*': case '}': | |
564 | *(p++) = '}'; | |
565 | *(p++) = c ^ 0x20; | |
566 | break; | |
567 | default: | |
568 | *(p++) = c; | |
569 | break; | |
570 | } | |
571 | } | |
572 | return p - buf; | |
573 | } | |
574 | ||
575 | static const char *get_feature_xml(const char *p, const char **newp, | |
576 | CPUClass *cc) | |
577 | { | |
578 | size_t len; | |
579 | int i; | |
580 | const char *name; | |
581 | static char target_xml[1024]; | |
582 | ||
583 | len = 0; | |
584 | while (p[len] && p[len] != ':') | |
585 | len++; | |
586 | *newp = p + len; | |
587 | ||
588 | name = NULL; | |
589 | if (strncmp(p, "target.xml", len) == 0) { | |
590 | /* Generate the XML description for this CPU. */ | |
591 | if (!target_xml[0]) { | |
592 | GDBRegisterState *r; | |
593 | CPUState *cpu = first_cpu; | |
594 | ||
595 | pstrcat(target_xml, sizeof(target_xml), | |
596 | "<?xml version=\"1.0\"?>" | |
597 | "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">" | |
598 | "<target>"); | |
599 | if (cc->gdb_arch_name) { | |
600 | gchar *arch = cc->gdb_arch_name(cpu); | |
601 | pstrcat(target_xml, sizeof(target_xml), "<architecture>"); | |
602 | pstrcat(target_xml, sizeof(target_xml), arch); | |
603 | pstrcat(target_xml, sizeof(target_xml), "</architecture>"); | |
604 | g_free(arch); | |
605 | } | |
606 | pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\""); | |
607 | pstrcat(target_xml, sizeof(target_xml), cc->gdb_core_xml_file); | |
608 | pstrcat(target_xml, sizeof(target_xml), "\"/>"); | |
609 | for (r = cpu->gdb_regs; r; r = r->next) { | |
610 | pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\""); | |
611 | pstrcat(target_xml, sizeof(target_xml), r->xml); | |
612 | pstrcat(target_xml, sizeof(target_xml), "\"/>"); | |
613 | } | |
614 | pstrcat(target_xml, sizeof(target_xml), "</target>"); | |
615 | } | |
616 | return target_xml; | |
617 | } | |
618 | for (i = 0; ; i++) { | |
619 | name = xml_builtin[i][0]; | |
620 | if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len)) | |
621 | break; | |
622 | } | |
623 | return name ? xml_builtin[i][1] : NULL; | |
624 | } | |
625 | ||
626 | static int gdb_read_register(CPUState *cpu, uint8_t *mem_buf, int reg) | |
627 | { | |
628 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
629 | CPUArchState *env = cpu->env_ptr; | |
630 | GDBRegisterState *r; | |
631 | ||
632 | if (reg < cc->gdb_num_core_regs) { | |
633 | return cc->gdb_read_register(cpu, mem_buf, reg); | |
634 | } | |
635 | ||
636 | for (r = cpu->gdb_regs; r; r = r->next) { | |
637 | if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { | |
638 | return r->get_reg(env, mem_buf, reg - r->base_reg); | |
639 | } | |
640 | } | |
641 | return 0; | |
642 | } | |
643 | ||
644 | static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) | |
645 | { | |
646 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
647 | CPUArchState *env = cpu->env_ptr; | |
648 | GDBRegisterState *r; | |
649 | ||
650 | if (reg < cc->gdb_num_core_regs) { | |
651 | return cc->gdb_write_register(cpu, mem_buf, reg); | |
652 | } | |
653 | ||
654 | for (r = cpu->gdb_regs; r; r = r->next) { | |
655 | if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { | |
656 | return r->set_reg(env, mem_buf, reg - r->base_reg); | |
657 | } | |
658 | } | |
659 | return 0; | |
660 | } | |
661 | ||
662 | /* Register a supplemental set of CPU registers. If g_pos is nonzero it | |
663 | specifies the first register number and these registers are included in | |
664 | a standard "g" packet. Direction is relative to gdb, i.e. get_reg is | |
665 | gdb reading a CPU register, and set_reg is gdb modifying a CPU register. | |
666 | */ | |
667 | ||
668 | void gdb_register_coprocessor(CPUState *cpu, | |
669 | gdb_reg_cb get_reg, gdb_reg_cb set_reg, | |
670 | int num_regs, const char *xml, int g_pos) | |
671 | { | |
672 | GDBRegisterState *s; | |
673 | GDBRegisterState **p; | |
674 | ||
675 | p = &cpu->gdb_regs; | |
676 | while (*p) { | |
677 | /* Check for duplicates. */ | |
678 | if (strcmp((*p)->xml, xml) == 0) | |
679 | return; | |
680 | p = &(*p)->next; | |
681 | } | |
682 | ||
683 | s = g_new0(GDBRegisterState, 1); | |
684 | s->base_reg = cpu->gdb_num_regs; | |
685 | s->num_regs = num_regs; | |
686 | s->get_reg = get_reg; | |
687 | s->set_reg = set_reg; | |
688 | s->xml = xml; | |
689 | ||
690 | /* Add to end of list. */ | |
691 | cpu->gdb_num_regs += num_regs; | |
692 | *p = s; | |
693 | if (g_pos) { | |
694 | if (g_pos != s->base_reg) { | |
695 | error_report("Error: Bad gdb register numbering for '%s', " | |
696 | "expected %d got %d", xml, g_pos, s->base_reg); | |
697 | } else { | |
698 | cpu->gdb_num_g_regs = cpu->gdb_num_regs; | |
699 | } | |
700 | } | |
701 | } | |
702 | ||
703 | #ifndef CONFIG_USER_ONLY | |
704 | /* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */ | |
705 | static inline int xlat_gdb_type(CPUState *cpu, int gdbtype) | |
706 | { | |
707 | static const int xlat[] = { | |
708 | [GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE, | |
709 | [GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ, | |
710 | [GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS, | |
711 | }; | |
712 | ||
713 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
714 | int cputype = xlat[gdbtype]; | |
715 | ||
716 | if (cc->gdb_stop_before_watchpoint) { | |
717 | cputype |= BP_STOP_BEFORE_ACCESS; | |
718 | } | |
719 | return cputype; | |
720 | } | |
721 | #endif | |
722 | ||
723 | static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type) | |
724 | { | |
725 | CPUState *cpu; | |
726 | int err = 0; | |
727 | ||
728 | if (kvm_enabled()) { | |
729 | return kvm_insert_breakpoint(gdbserver_state->c_cpu, addr, len, type); | |
730 | } | |
731 | ||
732 | switch (type) { | |
733 | case GDB_BREAKPOINT_SW: | |
734 | case GDB_BREAKPOINT_HW: | |
735 | CPU_FOREACH(cpu) { | |
736 | err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL); | |
737 | if (err) { | |
738 | break; | |
739 | } | |
740 | } | |
741 | return err; | |
742 | #ifndef CONFIG_USER_ONLY | |
743 | case GDB_WATCHPOINT_WRITE: | |
744 | case GDB_WATCHPOINT_READ: | |
745 | case GDB_WATCHPOINT_ACCESS: | |
746 | CPU_FOREACH(cpu) { | |
747 | err = cpu_watchpoint_insert(cpu, addr, len, | |
748 | xlat_gdb_type(cpu, type), NULL); | |
749 | if (err) { | |
750 | break; | |
751 | } | |
752 | } | |
753 | return err; | |
754 | #endif | |
755 | default: | |
756 | return -ENOSYS; | |
757 | } | |
758 | } | |
759 | ||
760 | static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type) | |
761 | { | |
762 | CPUState *cpu; | |
763 | int err = 0; | |
764 | ||
765 | if (kvm_enabled()) { | |
766 | return kvm_remove_breakpoint(gdbserver_state->c_cpu, addr, len, type); | |
767 | } | |
768 | ||
769 | switch (type) { | |
770 | case GDB_BREAKPOINT_SW: | |
771 | case GDB_BREAKPOINT_HW: | |
772 | CPU_FOREACH(cpu) { | |
773 | err = cpu_breakpoint_remove(cpu, addr, BP_GDB); | |
774 | if (err) { | |
775 | break; | |
776 | } | |
777 | } | |
778 | return err; | |
779 | #ifndef CONFIG_USER_ONLY | |
780 | case GDB_WATCHPOINT_WRITE: | |
781 | case GDB_WATCHPOINT_READ: | |
782 | case GDB_WATCHPOINT_ACCESS: | |
783 | CPU_FOREACH(cpu) { | |
784 | err = cpu_watchpoint_remove(cpu, addr, len, | |
785 | xlat_gdb_type(cpu, type)); | |
786 | if (err) | |
787 | break; | |
788 | } | |
789 | return err; | |
790 | #endif | |
791 | default: | |
792 | return -ENOSYS; | |
793 | } | |
794 | } | |
795 | ||
796 | static void gdb_breakpoint_remove_all(void) | |
797 | { | |
798 | CPUState *cpu; | |
799 | ||
800 | if (kvm_enabled()) { | |
801 | kvm_remove_all_breakpoints(gdbserver_state->c_cpu); | |
802 | return; | |
803 | } | |
804 | ||
805 | CPU_FOREACH(cpu) { | |
806 | cpu_breakpoint_remove_all(cpu, BP_GDB); | |
807 | #ifndef CONFIG_USER_ONLY | |
808 | cpu_watchpoint_remove_all(cpu, BP_GDB); | |
809 | #endif | |
810 | } | |
811 | } | |
812 | ||
813 | static void gdb_set_cpu_pc(GDBState *s, target_ulong pc) | |
814 | { | |
815 | CPUState *cpu = s->c_cpu; | |
816 | ||
817 | cpu_synchronize_state(cpu); | |
818 | cpu_set_pc(cpu, pc); | |
819 | } | |
820 | ||
821 | static CPUState *find_cpu(uint32_t thread_id) | |
822 | { | |
823 | CPUState *cpu; | |
824 | ||
825 | CPU_FOREACH(cpu) { | |
826 | if (cpu_index(cpu) == thread_id) { | |
827 | return cpu; | |
828 | } | |
829 | } | |
830 | ||
831 | return NULL; | |
832 | } | |
833 | ||
834 | static int is_query_packet(const char *p, const char *query, char separator) | |
835 | { | |
836 | unsigned int query_len = strlen(query); | |
837 | ||
838 | return strncmp(p, query, query_len) == 0 && | |
839 | (p[query_len] == '\0' || p[query_len] == separator); | |
840 | } | |
841 | ||
842 | /** | |
843 | * gdb_handle_vcont - Parses and handles a vCont packet. | |
844 | * returns -ENOTSUP if a command is unsupported, -EINVAL or -ERANGE if there is | |
845 | * a format error, 0 on success. | |
846 | */ | |
847 | static int gdb_handle_vcont(GDBState *s, const char *p) | |
848 | { | |
849 | int res, idx, signal = 0; | |
850 | char cur_action; | |
851 | char *newstates; | |
852 | unsigned long tmp; | |
853 | CPUState *cpu; | |
854 | #ifdef CONFIG_USER_ONLY | |
855 | int max_cpus = 1; /* global variable max_cpus exists only in system mode */ | |
856 | ||
857 | CPU_FOREACH(cpu) { | |
858 | max_cpus = max_cpus <= cpu->cpu_index ? cpu->cpu_index + 1 : max_cpus; | |
859 | } | |
860 | #endif | |
861 | /* uninitialised CPUs stay 0 */ | |
862 | newstates = g_new0(char, max_cpus); | |
863 | ||
864 | /* mark valid CPUs with 1 */ | |
865 | CPU_FOREACH(cpu) { | |
866 | newstates[cpu->cpu_index] = 1; | |
867 | } | |
868 | ||
869 | /* | |
870 | * res keeps track of what error we are returning, with -ENOTSUP meaning | |
871 | * that the command is unknown or unsupported, thus returning an empty | |
872 | * packet, while -EINVAL and -ERANGE cause an E22 packet, due to invalid, | |
873 | * or incorrect parameters passed. | |
874 | */ | |
875 | res = 0; | |
876 | while (*p) { | |
877 | if (*p++ != ';') { | |
878 | res = -ENOTSUP; | |
879 | goto out; | |
880 | } | |
881 | ||
882 | cur_action = *p++; | |
883 | if (cur_action == 'C' || cur_action == 'S') { | |
884 | cur_action = tolower(cur_action); | |
885 | res = qemu_strtoul(p + 1, &p, 16, &tmp); | |
886 | if (res) { | |
887 | goto out; | |
888 | } | |
889 | signal = gdb_signal_to_target(tmp); | |
890 | } else if (cur_action != 'c' && cur_action != 's') { | |
891 | /* unknown/invalid/unsupported command */ | |
892 | res = -ENOTSUP; | |
893 | goto out; | |
894 | } | |
895 | /* thread specification. special values: (none), -1 = all; 0 = any */ | |
896 | if ((p[0] == ':' && p[1] == '-' && p[2] == '1') || (p[0] != ':')) { | |
897 | if (*p == ':') { | |
898 | p += 3; | |
899 | } | |
900 | for (idx = 0; idx < max_cpus; idx++) { | |
901 | if (newstates[idx] == 1) { | |
902 | newstates[idx] = cur_action; | |
903 | } | |
904 | } | |
905 | } else if (*p == ':') { | |
906 | p++; | |
907 | res = qemu_strtoul(p, &p, 16, &tmp); | |
908 | if (res) { | |
909 | goto out; | |
910 | } | |
911 | idx = tmp; | |
912 | /* 0 means any thread, so we pick the first valid CPU */ | |
913 | if (!idx) { | |
914 | idx = cpu_index(first_cpu); | |
915 | } | |
916 | ||
917 | /* | |
918 | * If we are in user mode, the thread specified is actually a | |
919 | * thread id, and not an index. We need to find the actual | |
920 | * CPU first, and only then we can use its index. | |
921 | */ | |
922 | cpu = find_cpu(idx); | |
923 | /* invalid CPU/thread specified */ | |
924 | if (!idx || !cpu) { | |
925 | res = -EINVAL; | |
926 | goto out; | |
927 | } | |
928 | /* only use if no previous match occourred */ | |
929 | if (newstates[cpu->cpu_index] == 1) { | |
930 | newstates[cpu->cpu_index] = cur_action; | |
931 | } | |
932 | } | |
933 | } | |
934 | s->signal = signal; | |
935 | gdb_continue_partial(s, newstates); | |
936 | ||
937 | out: | |
938 | g_free(newstates); | |
939 | ||
940 | return res; | |
941 | } | |
942 | ||
943 | static int gdb_handle_packet(GDBState *s, const char *line_buf) | |
944 | { | |
945 | CPUState *cpu; | |
946 | CPUClass *cc; | |
947 | const char *p; | |
948 | uint32_t thread; | |
949 | int ch, reg_size, type, res; | |
950 | char buf[MAX_PACKET_LENGTH]; | |
951 | uint8_t mem_buf[MAX_PACKET_LENGTH]; | |
952 | uint8_t *registers; | |
953 | target_ulong addr, len; | |
954 | ||
955 | #ifdef DEBUG_GDB | |
956 | printf("command='%s'\n", line_buf); | |
957 | #endif | |
958 | p = line_buf; | |
959 | ch = *p++; | |
960 | switch(ch) { | |
961 | case '?': | |
962 | /* TODO: Make this return the correct value for user-mode. */ | |
963 | snprintf(buf, sizeof(buf), "T%02xthread:%02x;", GDB_SIGNAL_TRAP, | |
964 | cpu_index(s->c_cpu)); | |
965 | put_packet(s, buf); | |
966 | /* Remove all the breakpoints when this query is issued, | |
967 | * because gdb is doing and initial connect and the state | |
968 | * should be cleaned up. | |
969 | */ | |
970 | gdb_breakpoint_remove_all(); | |
971 | break; | |
972 | case 'c': | |
973 | if (*p != '\0') { | |
974 | addr = strtoull(p, (char **)&p, 16); | |
975 | gdb_set_cpu_pc(s, addr); | |
976 | } | |
977 | s->signal = 0; | |
978 | gdb_continue(s); | |
979 | return RS_IDLE; | |
980 | case 'C': | |
981 | s->signal = gdb_signal_to_target (strtoul(p, (char **)&p, 16)); | |
982 | if (s->signal == -1) | |
983 | s->signal = 0; | |
984 | gdb_continue(s); | |
985 | return RS_IDLE; | |
986 | case 'v': | |
987 | if (strncmp(p, "Cont", 4) == 0) { | |
988 | p += 4; | |
989 | if (*p == '?') { | |
990 | put_packet(s, "vCont;c;C;s;S"); | |
991 | break; | |
992 | } | |
993 | ||
994 | res = gdb_handle_vcont(s, p); | |
995 | ||
996 | if (res) { | |
997 | if ((res == -EINVAL) || (res == -ERANGE)) { | |
998 | put_packet(s, "E22"); | |
999 | break; | |
1000 | } | |
1001 | goto unknown_command; | |
1002 | } | |
1003 | break; | |
1004 | } else { | |
1005 | goto unknown_command; | |
1006 | } | |
1007 | case 'k': | |
1008 | /* Kill the target */ | |
1009 | error_report("QEMU: Terminated via GDBstub"); | |
1010 | exit(0); | |
1011 | case 'D': | |
1012 | /* Detach packet */ | |
1013 | gdb_breakpoint_remove_all(); | |
1014 | gdb_syscall_mode = GDB_SYS_DISABLED; | |
1015 | gdb_continue(s); | |
1016 | put_packet(s, "OK"); | |
1017 | break; | |
1018 | case 's': | |
1019 | if (*p != '\0') { | |
1020 | addr = strtoull(p, (char **)&p, 16); | |
1021 | gdb_set_cpu_pc(s, addr); | |
1022 | } | |
1023 | cpu_single_step(s->c_cpu, sstep_flags); | |
1024 | gdb_continue(s); | |
1025 | return RS_IDLE; | |
1026 | case 'F': | |
1027 | { | |
1028 | target_ulong ret; | |
1029 | target_ulong err; | |
1030 | ||
1031 | ret = strtoull(p, (char **)&p, 16); | |
1032 | if (*p == ',') { | |
1033 | p++; | |
1034 | err = strtoull(p, (char **)&p, 16); | |
1035 | } else { | |
1036 | err = 0; | |
1037 | } | |
1038 | if (*p == ',') | |
1039 | p++; | |
1040 | type = *p; | |
1041 | if (s->current_syscall_cb) { | |
1042 | s->current_syscall_cb(s->c_cpu, ret, err); | |
1043 | s->current_syscall_cb = NULL; | |
1044 | } | |
1045 | if (type == 'C') { | |
1046 | put_packet(s, "T02"); | |
1047 | } else { | |
1048 | gdb_continue(s); | |
1049 | } | |
1050 | } | |
1051 | break; | |
1052 | case 'g': | |
1053 | cpu_synchronize_state(s->g_cpu); | |
1054 | len = 0; | |
1055 | for (addr = 0; addr < s->g_cpu->gdb_num_g_regs; addr++) { | |
1056 | reg_size = gdb_read_register(s->g_cpu, mem_buf + len, addr); | |
1057 | len += reg_size; | |
1058 | } | |
1059 | memtohex(buf, mem_buf, len); | |
1060 | put_packet(s, buf); | |
1061 | break; | |
1062 | case 'G': | |
1063 | cpu_synchronize_state(s->g_cpu); | |
1064 | registers = mem_buf; | |
1065 | len = strlen(p) / 2; | |
1066 | hextomem((uint8_t *)registers, p, len); | |
1067 | for (addr = 0; addr < s->g_cpu->gdb_num_g_regs && len > 0; addr++) { | |
1068 | reg_size = gdb_write_register(s->g_cpu, registers, addr); | |
1069 | len -= reg_size; | |
1070 | registers += reg_size; | |
1071 | } | |
1072 | put_packet(s, "OK"); | |
1073 | break; | |
1074 | case 'm': | |
1075 | addr = strtoull(p, (char **)&p, 16); | |
1076 | if (*p == ',') | |
1077 | p++; | |
1078 | len = strtoull(p, NULL, 16); | |
1079 | ||
1080 | /* memtohex() doubles the required space */ | |
1081 | if (len > MAX_PACKET_LENGTH / 2) { | |
1082 | put_packet (s, "E22"); | |
1083 | break; | |
1084 | } | |
1085 | ||
1086 | if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, false) != 0) { | |
1087 | put_packet (s, "E14"); | |
1088 | } else { | |
1089 | memtohex(buf, mem_buf, len); | |
1090 | put_packet(s, buf); | |
1091 | } | |
1092 | break; | |
1093 | case 'M': | |
1094 | addr = strtoull(p, (char **)&p, 16); | |
1095 | if (*p == ',') | |
1096 | p++; | |
1097 | len = strtoull(p, (char **)&p, 16); | |
1098 | if (*p == ':') | |
1099 | p++; | |
1100 | ||
1101 | /* hextomem() reads 2*len bytes */ | |
1102 | if (len > strlen(p) / 2) { | |
1103 | put_packet (s, "E22"); | |
1104 | break; | |
1105 | } | |
1106 | hextomem(mem_buf, p, len); | |
1107 | if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, | |
1108 | true) != 0) { | |
1109 | put_packet(s, "E14"); | |
1110 | } else { | |
1111 | put_packet(s, "OK"); | |
1112 | } | |
1113 | break; | |
1114 | case 'p': | |
1115 | /* Older gdb are really dumb, and don't use 'g' if 'p' is avaialable. | |
1116 | This works, but can be very slow. Anything new enough to | |
1117 | understand XML also knows how to use this properly. */ | |
1118 | if (!gdb_has_xml) | |
1119 | goto unknown_command; | |
1120 | addr = strtoull(p, (char **)&p, 16); | |
1121 | reg_size = gdb_read_register(s->g_cpu, mem_buf, addr); | |
1122 | if (reg_size) { | |
1123 | memtohex(buf, mem_buf, reg_size); | |
1124 | put_packet(s, buf); | |
1125 | } else { | |
1126 | put_packet(s, "E14"); | |
1127 | } | |
1128 | break; | |
1129 | case 'P': | |
1130 | if (!gdb_has_xml) | |
1131 | goto unknown_command; | |
1132 | addr = strtoull(p, (char **)&p, 16); | |
1133 | if (*p == '=') | |
1134 | p++; | |
1135 | reg_size = strlen(p) / 2; | |
1136 | hextomem(mem_buf, p, reg_size); | |
1137 | gdb_write_register(s->g_cpu, mem_buf, addr); | |
1138 | put_packet(s, "OK"); | |
1139 | break; | |
1140 | case 'Z': | |
1141 | case 'z': | |
1142 | type = strtoul(p, (char **)&p, 16); | |
1143 | if (*p == ',') | |
1144 | p++; | |
1145 | addr = strtoull(p, (char **)&p, 16); | |
1146 | if (*p == ',') | |
1147 | p++; | |
1148 | len = strtoull(p, (char **)&p, 16); | |
1149 | if (ch == 'Z') | |
1150 | res = gdb_breakpoint_insert(addr, len, type); | |
1151 | else | |
1152 | res = gdb_breakpoint_remove(addr, len, type); | |
1153 | if (res >= 0) | |
1154 | put_packet(s, "OK"); | |
1155 | else if (res == -ENOSYS) | |
1156 | put_packet(s, ""); | |
1157 | else | |
1158 | put_packet(s, "E22"); | |
1159 | break; | |
1160 | case 'H': | |
1161 | type = *p++; | |
1162 | thread = strtoull(p, (char **)&p, 16); | |
1163 | if (thread == -1 || thread == 0) { | |
1164 | put_packet(s, "OK"); | |
1165 | break; | |
1166 | } | |
1167 | cpu = find_cpu(thread); | |
1168 | if (cpu == NULL) { | |
1169 | put_packet(s, "E22"); | |
1170 | break; | |
1171 | } | |
1172 | switch (type) { | |
1173 | case 'c': | |
1174 | s->c_cpu = cpu; | |
1175 | put_packet(s, "OK"); | |
1176 | break; | |
1177 | case 'g': | |
1178 | s->g_cpu = cpu; | |
1179 | put_packet(s, "OK"); | |
1180 | break; | |
1181 | default: | |
1182 | put_packet(s, "E22"); | |
1183 | break; | |
1184 | } | |
1185 | break; | |
1186 | case 'T': | |
1187 | thread = strtoull(p, (char **)&p, 16); | |
1188 | cpu = find_cpu(thread); | |
1189 | ||
1190 | if (cpu != NULL) { | |
1191 | put_packet(s, "OK"); | |
1192 | } else { | |
1193 | put_packet(s, "E22"); | |
1194 | } | |
1195 | break; | |
1196 | case 'q': | |
1197 | case 'Q': | |
1198 | /* parse any 'q' packets here */ | |
1199 | if (!strcmp(p,"qemu.sstepbits")) { | |
1200 | /* Query Breakpoint bit definitions */ | |
1201 | snprintf(buf, sizeof(buf), "ENABLE=%x,NOIRQ=%x,NOTIMER=%x", | |
1202 | SSTEP_ENABLE, | |
1203 | SSTEP_NOIRQ, | |
1204 | SSTEP_NOTIMER); | |
1205 | put_packet(s, buf); | |
1206 | break; | |
1207 | } else if (is_query_packet(p, "qemu.sstep", '=')) { | |
1208 | /* Display or change the sstep_flags */ | |
1209 | p += 10; | |
1210 | if (*p != '=') { | |
1211 | /* Display current setting */ | |
1212 | snprintf(buf, sizeof(buf), "0x%x", sstep_flags); | |
1213 | put_packet(s, buf); | |
1214 | break; | |
1215 | } | |
1216 | p++; | |
1217 | type = strtoul(p, (char **)&p, 16); | |
1218 | sstep_flags = type; | |
1219 | put_packet(s, "OK"); | |
1220 | break; | |
1221 | } else if (strcmp(p,"C") == 0) { | |
1222 | /* "Current thread" remains vague in the spec, so always return | |
1223 | * the first CPU (gdb returns the first thread). */ | |
1224 | put_packet(s, "QC1"); | |
1225 | break; | |
1226 | } else if (strcmp(p,"fThreadInfo") == 0) { | |
1227 | s->query_cpu = first_cpu; | |
1228 | goto report_cpuinfo; | |
1229 | } else if (strcmp(p,"sThreadInfo") == 0) { | |
1230 | report_cpuinfo: | |
1231 | if (s->query_cpu) { | |
1232 | snprintf(buf, sizeof(buf), "m%x", cpu_index(s->query_cpu)); | |
1233 | put_packet(s, buf); | |
1234 | s->query_cpu = CPU_NEXT(s->query_cpu); | |
1235 | } else | |
1236 | put_packet(s, "l"); | |
1237 | break; | |
1238 | } else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) { | |
1239 | thread = strtoull(p+16, (char **)&p, 16); | |
1240 | cpu = find_cpu(thread); | |
1241 | if (cpu != NULL) { | |
1242 | cpu_synchronize_state(cpu); | |
1243 | /* memtohex() doubles the required space */ | |
1244 | len = snprintf((char *)mem_buf, sizeof(buf) / 2, | |
1245 | "CPU#%d [%s]", cpu->cpu_index, | |
1246 | cpu->halted ? "halted " : "running"); | |
1247 | memtohex(buf, mem_buf, len); | |
1248 | put_packet(s, buf); | |
1249 | } | |
1250 | break; | |
1251 | } | |
1252 | #ifdef CONFIG_USER_ONLY | |
1253 | else if (strcmp(p, "Offsets") == 0) { | |
1254 | TaskState *ts = s->c_cpu->opaque; | |
1255 | ||
1256 | snprintf(buf, sizeof(buf), | |
1257 | "Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx | |
1258 | ";Bss=" TARGET_ABI_FMT_lx, | |
1259 | ts->info->code_offset, | |
1260 | ts->info->data_offset, | |
1261 | ts->info->data_offset); | |
1262 | put_packet(s, buf); | |
1263 | break; | |
1264 | } | |
1265 | #else /* !CONFIG_USER_ONLY */ | |
1266 | else if (strncmp(p, "Rcmd,", 5) == 0) { | |
1267 | int len = strlen(p + 5); | |
1268 | ||
1269 | if ((len % 2) != 0) { | |
1270 | put_packet(s, "E01"); | |
1271 | break; | |
1272 | } | |
1273 | len = len / 2; | |
1274 | hextomem(mem_buf, p + 5, len); | |
1275 | mem_buf[len++] = 0; | |
1276 | qemu_chr_be_write(s->mon_chr, mem_buf, len); | |
1277 | put_packet(s, "OK"); | |
1278 | break; | |
1279 | } | |
1280 | #endif /* !CONFIG_USER_ONLY */ | |
1281 | if (is_query_packet(p, "Supported", ':')) { | |
1282 | snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH); | |
1283 | cc = CPU_GET_CLASS(first_cpu); | |
1284 | if (cc->gdb_core_xml_file != NULL) { | |
1285 | pstrcat(buf, sizeof(buf), ";qXfer:features:read+"); | |
1286 | } | |
1287 | put_packet(s, buf); | |
1288 | break; | |
1289 | } | |
1290 | if (strncmp(p, "Xfer:features:read:", 19) == 0) { | |
1291 | const char *xml; | |
1292 | target_ulong total_len; | |
1293 | ||
1294 | cc = CPU_GET_CLASS(first_cpu); | |
1295 | if (cc->gdb_core_xml_file == NULL) { | |
1296 | goto unknown_command; | |
1297 | } | |
1298 | ||
1299 | gdb_has_xml = true; | |
1300 | p += 19; | |
1301 | xml = get_feature_xml(p, &p, cc); | |
1302 | if (!xml) { | |
1303 | snprintf(buf, sizeof(buf), "E00"); | |
1304 | put_packet(s, buf); | |
1305 | break; | |
1306 | } | |
1307 | ||
1308 | if (*p == ':') | |
1309 | p++; | |
1310 | addr = strtoul(p, (char **)&p, 16); | |
1311 | if (*p == ',') | |
1312 | p++; | |
1313 | len = strtoul(p, (char **)&p, 16); | |
1314 | ||
1315 | total_len = strlen(xml); | |
1316 | if (addr > total_len) { | |
1317 | snprintf(buf, sizeof(buf), "E00"); | |
1318 | put_packet(s, buf); | |
1319 | break; | |
1320 | } | |
1321 | if (len > (MAX_PACKET_LENGTH - 5) / 2) | |
1322 | len = (MAX_PACKET_LENGTH - 5) / 2; | |
1323 | if (len < total_len - addr) { | |
1324 | buf[0] = 'm'; | |
1325 | len = memtox(buf + 1, xml + addr, len); | |
1326 | } else { | |
1327 | buf[0] = 'l'; | |
1328 | len = memtox(buf + 1, xml + addr, total_len - addr); | |
1329 | } | |
1330 | put_packet_binary(s, buf, len + 1); | |
1331 | break; | |
1332 | } | |
1333 | if (is_query_packet(p, "Attached", ':')) { | |
1334 | put_packet(s, GDB_ATTACHED); | |
1335 | break; | |
1336 | } | |
1337 | /* Unrecognised 'q' command. */ | |
1338 | goto unknown_command; | |
1339 | ||
1340 | default: | |
1341 | unknown_command: | |
1342 | /* put empty packet */ | |
1343 | buf[0] = '\0'; | |
1344 | put_packet(s, buf); | |
1345 | break; | |
1346 | } | |
1347 | return RS_IDLE; | |
1348 | } | |
1349 | ||
1350 | void gdb_set_stop_cpu(CPUState *cpu) | |
1351 | { | |
1352 | gdbserver_state->c_cpu = cpu; | |
1353 | gdbserver_state->g_cpu = cpu; | |
1354 | } | |
1355 | ||
1356 | #ifndef CONFIG_USER_ONLY | |
1357 | static void gdb_vm_state_change(void *opaque, int running, RunState state) | |
1358 | { | |
1359 | GDBState *s = gdbserver_state; | |
1360 | CPUState *cpu = s->c_cpu; | |
1361 | char buf[256]; | |
1362 | const char *type; | |
1363 | int ret; | |
1364 | ||
1365 | if (running || s->state == RS_INACTIVE) { | |
1366 | return; | |
1367 | } | |
1368 | /* Is there a GDB syscall waiting to be sent? */ | |
1369 | if (s->current_syscall_cb) { | |
1370 | put_packet(s, s->syscall_buf); | |
1371 | return; | |
1372 | } | |
1373 | switch (state) { | |
1374 | case RUN_STATE_DEBUG: | |
1375 | if (cpu->watchpoint_hit) { | |
1376 | switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) { | |
1377 | case BP_MEM_READ: | |
1378 | type = "r"; | |
1379 | break; | |
1380 | case BP_MEM_ACCESS: | |
1381 | type = "a"; | |
1382 | break; | |
1383 | default: | |
1384 | type = ""; | |
1385 | break; | |
1386 | } | |
1387 | snprintf(buf, sizeof(buf), | |
1388 | "T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";", | |
1389 | GDB_SIGNAL_TRAP, cpu_index(cpu), type, | |
1390 | (target_ulong)cpu->watchpoint_hit->vaddr); | |
1391 | cpu->watchpoint_hit = NULL; | |
1392 | goto send_packet; | |
1393 | } | |
1394 | tb_flush(cpu); | |
1395 | ret = GDB_SIGNAL_TRAP; | |
1396 | break; | |
1397 | case RUN_STATE_PAUSED: | |
1398 | ret = GDB_SIGNAL_INT; | |
1399 | break; | |
1400 | case RUN_STATE_SHUTDOWN: | |
1401 | ret = GDB_SIGNAL_QUIT; | |
1402 | break; | |
1403 | case RUN_STATE_IO_ERROR: | |
1404 | ret = GDB_SIGNAL_IO; | |
1405 | break; | |
1406 | case RUN_STATE_WATCHDOG: | |
1407 | ret = GDB_SIGNAL_ALRM; | |
1408 | break; | |
1409 | case RUN_STATE_INTERNAL_ERROR: | |
1410 | ret = GDB_SIGNAL_ABRT; | |
1411 | break; | |
1412 | case RUN_STATE_SAVE_VM: | |
1413 | case RUN_STATE_RESTORE_VM: | |
1414 | return; | |
1415 | case RUN_STATE_FINISH_MIGRATE: | |
1416 | ret = GDB_SIGNAL_XCPU; | |
1417 | break; | |
1418 | default: | |
1419 | ret = GDB_SIGNAL_UNKNOWN; | |
1420 | break; | |
1421 | } | |
1422 | gdb_set_stop_cpu(cpu); | |
1423 | snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, cpu_index(cpu)); | |
1424 | ||
1425 | send_packet: | |
1426 | put_packet(s, buf); | |
1427 | ||
1428 | /* disable single step if it was enabled */ | |
1429 | cpu_single_step(cpu, 0); | |
1430 | } | |
1431 | #endif | |
1432 | ||
1433 | /* Send a gdb syscall request. | |
1434 | This accepts limited printf-style format specifiers, specifically: | |
1435 | %x - target_ulong argument printed in hex. | |
1436 | %lx - 64-bit argument printed in hex. | |
1437 | %s - string pointer (target_ulong) and length (int) pair. */ | |
1438 | void gdb_do_syscallv(gdb_syscall_complete_cb cb, const char *fmt, va_list va) | |
1439 | { | |
1440 | char *p; | |
1441 | char *p_end; | |
1442 | target_ulong addr; | |
1443 | uint64_t i64; | |
1444 | GDBState *s; | |
1445 | ||
1446 | s = gdbserver_state; | |
1447 | if (!s) | |
1448 | return; | |
1449 | s->current_syscall_cb = cb; | |
1450 | #ifndef CONFIG_USER_ONLY | |
1451 | vm_stop(RUN_STATE_DEBUG); | |
1452 | #endif | |
1453 | p = s->syscall_buf; | |
1454 | p_end = &s->syscall_buf[sizeof(s->syscall_buf)]; | |
1455 | *(p++) = 'F'; | |
1456 | while (*fmt) { | |
1457 | if (*fmt == '%') { | |
1458 | fmt++; | |
1459 | switch (*fmt++) { | |
1460 | case 'x': | |
1461 | addr = va_arg(va, target_ulong); | |
1462 | p += snprintf(p, p_end - p, TARGET_FMT_lx, addr); | |
1463 | break; | |
1464 | case 'l': | |
1465 | if (*(fmt++) != 'x') | |
1466 | goto bad_format; | |
1467 | i64 = va_arg(va, uint64_t); | |
1468 | p += snprintf(p, p_end - p, "%" PRIx64, i64); | |
1469 | break; | |
1470 | case 's': | |
1471 | addr = va_arg(va, target_ulong); | |
1472 | p += snprintf(p, p_end - p, TARGET_FMT_lx "/%x", | |
1473 | addr, va_arg(va, int)); | |
1474 | break; | |
1475 | default: | |
1476 | bad_format: | |
1477 | error_report("gdbstub: Bad syscall format string '%s'", | |
1478 | fmt - 1); | |
1479 | break; | |
1480 | } | |
1481 | } else { | |
1482 | *(p++) = *(fmt++); | |
1483 | } | |
1484 | } | |
1485 | *p = 0; | |
1486 | #ifdef CONFIG_USER_ONLY | |
1487 | put_packet(s, s->syscall_buf); | |
1488 | gdb_handlesig(s->c_cpu, 0); | |
1489 | #else | |
1490 | /* In this case wait to send the syscall packet until notification that | |
1491 | the CPU has stopped. This must be done because if the packet is sent | |
1492 | now the reply from the syscall request could be received while the CPU | |
1493 | is still in the running state, which can cause packets to be dropped | |
1494 | and state transition 'T' packets to be sent while the syscall is still | |
1495 | being processed. */ | |
1496 | qemu_cpu_kick(s->c_cpu); | |
1497 | #endif | |
1498 | } | |
1499 | ||
1500 | void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) | |
1501 | { | |
1502 | va_list va; | |
1503 | ||
1504 | va_start(va, fmt); | |
1505 | gdb_do_syscallv(cb, fmt, va); | |
1506 | va_end(va); | |
1507 | } | |
1508 | ||
1509 | static void gdb_read_byte(GDBState *s, int ch) | |
1510 | { | |
1511 | int i, csum; | |
1512 | uint8_t reply; | |
1513 | ||
1514 | #ifndef CONFIG_USER_ONLY | |
1515 | if (s->last_packet_len) { | |
1516 | /* Waiting for a response to the last packet. If we see the start | |
1517 | of a new command then abandon the previous response. */ | |
1518 | if (ch == '-') { | |
1519 | #ifdef DEBUG_GDB | |
1520 | printf("Got NACK, retransmitting\n"); | |
1521 | #endif | |
1522 | put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); | |
1523 | } | |
1524 | #ifdef DEBUG_GDB | |
1525 | else if (ch == '+') | |
1526 | printf("Got ACK\n"); | |
1527 | else | |
1528 | printf("Got '%c' when expecting ACK/NACK\n", ch); | |
1529 | #endif | |
1530 | if (ch == '+' || ch == '$') | |
1531 | s->last_packet_len = 0; | |
1532 | if (ch != '$') | |
1533 | return; | |
1534 | } | |
1535 | if (runstate_is_running()) { | |
1536 | /* when the CPU is running, we cannot do anything except stop | |
1537 | it when receiving a char */ | |
1538 | vm_stop(RUN_STATE_PAUSED); | |
1539 | } else | |
1540 | #endif | |
1541 | { | |
1542 | switch(s->state) { | |
1543 | case RS_IDLE: | |
1544 | if (ch == '$') { | |
1545 | s->line_buf_index = 0; | |
1546 | s->state = RS_GETLINE; | |
1547 | } | |
1548 | break; | |
1549 | case RS_GETLINE: | |
1550 | if (ch == '#') { | |
1551 | s->state = RS_CHKSUM1; | |
1552 | } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { | |
1553 | s->state = RS_IDLE; | |
1554 | } else { | |
1555 | s->line_buf[s->line_buf_index++] = ch; | |
1556 | } | |
1557 | break; | |
1558 | case RS_CHKSUM1: | |
1559 | s->line_buf[s->line_buf_index] = '\0'; | |
1560 | s->line_csum = fromhex(ch) << 4; | |
1561 | s->state = RS_CHKSUM2; | |
1562 | break; | |
1563 | case RS_CHKSUM2: | |
1564 | s->line_csum |= fromhex(ch); | |
1565 | csum = 0; | |
1566 | for(i = 0; i < s->line_buf_index; i++) { | |
1567 | csum += s->line_buf[i]; | |
1568 | } | |
1569 | if (s->line_csum != (csum & 0xff)) { | |
1570 | reply = '-'; | |
1571 | put_buffer(s, &reply, 1); | |
1572 | s->state = RS_IDLE; | |
1573 | } else { | |
1574 | reply = '+'; | |
1575 | put_buffer(s, &reply, 1); | |
1576 | s->state = gdb_handle_packet(s, s->line_buf); | |
1577 | } | |
1578 | break; | |
1579 | default: | |
1580 | abort(); | |
1581 | } | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | /* Tell the remote gdb that the process has exited. */ | |
1586 | void gdb_exit(CPUArchState *env, int code) | |
1587 | { | |
1588 | GDBState *s; | |
1589 | char buf[4]; | |
1590 | #ifndef CONFIG_USER_ONLY | |
1591 | Chardev *chr; | |
1592 | #endif | |
1593 | ||
1594 | s = gdbserver_state; | |
1595 | if (!s) { | |
1596 | return; | |
1597 | } | |
1598 | #ifdef CONFIG_USER_ONLY | |
1599 | if (gdbserver_fd < 0 || s->fd < 0) { | |
1600 | return; | |
1601 | } | |
1602 | #else | |
1603 | chr = qemu_chr_fe_get_driver(&s->chr); | |
1604 | if (!chr) { | |
1605 | return; | |
1606 | } | |
1607 | #endif | |
1608 | ||
1609 | snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code); | |
1610 | put_packet(s, buf); | |
1611 | ||
1612 | #ifndef CONFIG_USER_ONLY | |
1613 | qemu_chr_fe_deinit(&s->chr); | |
1614 | qemu_chr_delete(chr); | |
1615 | #endif | |
1616 | } | |
1617 | ||
1618 | #ifdef CONFIG_USER_ONLY | |
1619 | int | |
1620 | gdb_handlesig(CPUState *cpu, int sig) | |
1621 | { | |
1622 | GDBState *s; | |
1623 | char buf[256]; | |
1624 | int n; | |
1625 | ||
1626 | s = gdbserver_state; | |
1627 | if (gdbserver_fd < 0 || s->fd < 0) { | |
1628 | return sig; | |
1629 | } | |
1630 | ||
1631 | /* disable single step if it was enabled */ | |
1632 | cpu_single_step(cpu, 0); | |
1633 | tb_flush(cpu); | |
1634 | ||
1635 | if (sig != 0) { | |
1636 | snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb(sig)); | |
1637 | put_packet(s, buf); | |
1638 | } | |
1639 | /* put_packet() might have detected that the peer terminated the | |
1640 | connection. */ | |
1641 | if (s->fd < 0) { | |
1642 | return sig; | |
1643 | } | |
1644 | ||
1645 | sig = 0; | |
1646 | s->state = RS_IDLE; | |
1647 | s->running_state = 0; | |
1648 | while (s->running_state == 0) { | |
1649 | n = read(s->fd, buf, 256); | |
1650 | if (n > 0) { | |
1651 | int i; | |
1652 | ||
1653 | for (i = 0; i < n; i++) { | |
1654 | gdb_read_byte(s, buf[i]); | |
1655 | } | |
1656 | } else { | |
1657 | /* XXX: Connection closed. Should probably wait for another | |
1658 | connection before continuing. */ | |
1659 | if (n == 0) { | |
1660 | close(s->fd); | |
1661 | } | |
1662 | s->fd = -1; | |
1663 | return sig; | |
1664 | } | |
1665 | } | |
1666 | sig = s->signal; | |
1667 | s->signal = 0; | |
1668 | return sig; | |
1669 | } | |
1670 | ||
1671 | /* Tell the remote gdb that the process has exited due to SIG. */ | |
1672 | void gdb_signalled(CPUArchState *env, int sig) | |
1673 | { | |
1674 | GDBState *s; | |
1675 | char buf[4]; | |
1676 | ||
1677 | s = gdbserver_state; | |
1678 | if (gdbserver_fd < 0 || s->fd < 0) { | |
1679 | return; | |
1680 | } | |
1681 | ||
1682 | snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb(sig)); | |
1683 | put_packet(s, buf); | |
1684 | } | |
1685 | ||
1686 | static void gdb_accept(void) | |
1687 | { | |
1688 | GDBState *s; | |
1689 | struct sockaddr_in sockaddr; | |
1690 | socklen_t len; | |
1691 | int fd; | |
1692 | ||
1693 | for(;;) { | |
1694 | len = sizeof(sockaddr); | |
1695 | fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len); | |
1696 | if (fd < 0 && errno != EINTR) { | |
1697 | perror("accept"); | |
1698 | return; | |
1699 | } else if (fd >= 0) { | |
1700 | #ifndef _WIN32 | |
1701 | fcntl(fd, F_SETFD, FD_CLOEXEC); | |
1702 | #endif | |
1703 | break; | |
1704 | } | |
1705 | } | |
1706 | ||
1707 | /* set short latency */ | |
1708 | socket_set_nodelay(fd); | |
1709 | ||
1710 | s = g_malloc0(sizeof(GDBState)); | |
1711 | s->c_cpu = first_cpu; | |
1712 | s->g_cpu = first_cpu; | |
1713 | s->fd = fd; | |
1714 | gdb_has_xml = false; | |
1715 | ||
1716 | gdbserver_state = s; | |
1717 | } | |
1718 | ||
1719 | static int gdbserver_open(int port) | |
1720 | { | |
1721 | struct sockaddr_in sockaddr; | |
1722 | int fd, ret; | |
1723 | ||
1724 | fd = socket(PF_INET, SOCK_STREAM, 0); | |
1725 | if (fd < 0) { | |
1726 | perror("socket"); | |
1727 | return -1; | |
1728 | } | |
1729 | #ifndef _WIN32 | |
1730 | fcntl(fd, F_SETFD, FD_CLOEXEC); | |
1731 | #endif | |
1732 | ||
1733 | socket_set_fast_reuse(fd); | |
1734 | ||
1735 | sockaddr.sin_family = AF_INET; | |
1736 | sockaddr.sin_port = htons(port); | |
1737 | sockaddr.sin_addr.s_addr = 0; | |
1738 | ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); | |
1739 | if (ret < 0) { | |
1740 | perror("bind"); | |
1741 | close(fd); | |
1742 | return -1; | |
1743 | } | |
1744 | ret = listen(fd, 1); | |
1745 | if (ret < 0) { | |
1746 | perror("listen"); | |
1747 | close(fd); | |
1748 | return -1; | |
1749 | } | |
1750 | return fd; | |
1751 | } | |
1752 | ||
1753 | int gdbserver_start(int port) | |
1754 | { | |
1755 | gdbserver_fd = gdbserver_open(port); | |
1756 | if (gdbserver_fd < 0) | |
1757 | return -1; | |
1758 | /* accept connections */ | |
1759 | gdb_accept(); | |
1760 | return 0; | |
1761 | } | |
1762 | ||
1763 | /* Disable gdb stub for child processes. */ | |
1764 | void gdbserver_fork(CPUState *cpu) | |
1765 | { | |
1766 | GDBState *s = gdbserver_state; | |
1767 | ||
1768 | if (gdbserver_fd < 0 || s->fd < 0) { | |
1769 | return; | |
1770 | } | |
1771 | close(s->fd); | |
1772 | s->fd = -1; | |
1773 | cpu_breakpoint_remove_all(cpu, BP_GDB); | |
1774 | cpu_watchpoint_remove_all(cpu, BP_GDB); | |
1775 | } | |
1776 | #else | |
1777 | static int gdb_chr_can_receive(void *opaque) | |
1778 | { | |
1779 | /* We can handle an arbitrarily large amount of data. | |
1780 | Pick the maximum packet size, which is as good as anything. */ | |
1781 | return MAX_PACKET_LENGTH; | |
1782 | } | |
1783 | ||
1784 | static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size) | |
1785 | { | |
1786 | int i; | |
1787 | ||
1788 | for (i = 0; i < size; i++) { | |
1789 | gdb_read_byte(gdbserver_state, buf[i]); | |
1790 | } | |
1791 | } | |
1792 | ||
1793 | static void gdb_chr_event(void *opaque, int event) | |
1794 | { | |
1795 | switch (event) { | |
1796 | case CHR_EVENT_OPENED: | |
1797 | vm_stop(RUN_STATE_PAUSED); | |
1798 | gdb_has_xml = false; | |
1799 | break; | |
1800 | default: | |
1801 | break; | |
1802 | } | |
1803 | } | |
1804 | ||
1805 | static void gdb_monitor_output(GDBState *s, const char *msg, int len) | |
1806 | { | |
1807 | char buf[MAX_PACKET_LENGTH]; | |
1808 | ||
1809 | buf[0] = 'O'; | |
1810 | if (len > (MAX_PACKET_LENGTH/2) - 1) | |
1811 | len = (MAX_PACKET_LENGTH/2) - 1; | |
1812 | memtohex(buf + 1, (uint8_t *)msg, len); | |
1813 | put_packet(s, buf); | |
1814 | } | |
1815 | ||
1816 | static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len) | |
1817 | { | |
1818 | const char *p = (const char *)buf; | |
1819 | int max_sz; | |
1820 | ||
1821 | max_sz = (sizeof(gdbserver_state->last_packet) - 2) / 2; | |
1822 | for (;;) { | |
1823 | if (len <= max_sz) { | |
1824 | gdb_monitor_output(gdbserver_state, p, len); | |
1825 | break; | |
1826 | } | |
1827 | gdb_monitor_output(gdbserver_state, p, max_sz); | |
1828 | p += max_sz; | |
1829 | len -= max_sz; | |
1830 | } | |
1831 | return len; | |
1832 | } | |
1833 | ||
1834 | #ifndef _WIN32 | |
1835 | static void gdb_sigterm_handler(int signal) | |
1836 | { | |
1837 | if (runstate_is_running()) { | |
1838 | vm_stop(RUN_STATE_PAUSED); | |
1839 | } | |
1840 | } | |
1841 | #endif | |
1842 | ||
1843 | static void gdb_monitor_open(Chardev *chr, ChardevBackend *backend, | |
1844 | bool *be_opened, Error **errp) | |
1845 | { | |
1846 | *be_opened = false; | |
1847 | } | |
1848 | ||
1849 | static void char_gdb_class_init(ObjectClass *oc, void *data) | |
1850 | { | |
1851 | ChardevClass *cc = CHARDEV_CLASS(oc); | |
1852 | ||
1853 | cc->internal = true; | |
1854 | cc->open = gdb_monitor_open; | |
1855 | cc->chr_write = gdb_monitor_write; | |
1856 | } | |
1857 | ||
1858 | #define TYPE_CHARDEV_GDB "chardev-gdb" | |
1859 | ||
1860 | static const TypeInfo char_gdb_type_info = { | |
1861 | .name = TYPE_CHARDEV_GDB, | |
1862 | .parent = TYPE_CHARDEV, | |
1863 | .class_init = char_gdb_class_init, | |
1864 | }; | |
1865 | ||
1866 | int gdbserver_start(const char *device) | |
1867 | { | |
1868 | GDBState *s; | |
1869 | char gdbstub_device_name[128]; | |
1870 | Chardev *chr = NULL; | |
1871 | Chardev *mon_chr; | |
1872 | ||
1873 | if (!first_cpu) { | |
1874 | error_report("gdbstub: meaningless to attach gdb to a " | |
1875 | "machine without any CPU."); | |
1876 | return -1; | |
1877 | } | |
1878 | ||
1879 | if (!device) | |
1880 | return -1; | |
1881 | if (strcmp(device, "none") != 0) { | |
1882 | if (strstart(device, "tcp:", NULL)) { | |
1883 | /* enforce required TCP attributes */ | |
1884 | snprintf(gdbstub_device_name, sizeof(gdbstub_device_name), | |
1885 | "%s,nowait,nodelay,server", device); | |
1886 | device = gdbstub_device_name; | |
1887 | } | |
1888 | #ifndef _WIN32 | |
1889 | else if (strcmp(device, "stdio") == 0) { | |
1890 | struct sigaction act; | |
1891 | ||
1892 | memset(&act, 0, sizeof(act)); | |
1893 | act.sa_handler = gdb_sigterm_handler; | |
1894 | sigaction(SIGINT, &act, NULL); | |
1895 | } | |
1896 | #endif | |
1897 | chr = qemu_chr_new_noreplay("gdb", device); | |
1898 | if (!chr) | |
1899 | return -1; | |
1900 | } | |
1901 | ||
1902 | s = gdbserver_state; | |
1903 | if (!s) { | |
1904 | s = g_malloc0(sizeof(GDBState)); | |
1905 | gdbserver_state = s; | |
1906 | ||
1907 | qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL); | |
1908 | ||
1909 | /* Initialize a monitor terminal for gdb */ | |
1910 | mon_chr = qemu_chardev_new(NULL, TYPE_CHARDEV_GDB, | |
1911 | NULL, &error_abort); | |
1912 | monitor_init(mon_chr, 0); | |
1913 | } else { | |
1914 | if (qemu_chr_fe_get_driver(&s->chr)) { | |
1915 | qemu_chr_delete(qemu_chr_fe_get_driver(&s->chr)); | |
1916 | } | |
1917 | mon_chr = s->mon_chr; | |
1918 | memset(s, 0, sizeof(GDBState)); | |
1919 | s->mon_chr = mon_chr; | |
1920 | } | |
1921 | s->c_cpu = first_cpu; | |
1922 | s->g_cpu = first_cpu; | |
1923 | if (chr) { | |
1924 | qemu_chr_fe_init(&s->chr, chr, &error_abort); | |
1925 | qemu_chr_fe_set_handlers(&s->chr, gdb_chr_can_receive, gdb_chr_receive, | |
1926 | gdb_chr_event, NULL, NULL, true); | |
1927 | } | |
1928 | s->state = chr ? RS_IDLE : RS_INACTIVE; | |
1929 | s->mon_chr = mon_chr; | |
1930 | s->current_syscall_cb = NULL; | |
1931 | ||
1932 | return 0; | |
1933 | } | |
1934 | ||
1935 | static void register_types(void) | |
1936 | { | |
1937 | type_register_static(&char_gdb_type_info); | |
1938 | } | |
1939 | ||
1940 | type_init(register_types); | |
1941 | #endif |