]>
Commit | Line | Data |
---|---|---|
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_check(RUN_STATE_GUEST_PANICKED)) { | |
372 | runstate_set(RUN_STATE_DEBUG); | |
373 | } | |
374 | if (!runstate_needs_reset()) { | |
375 | vm_start(); | |
376 | } | |
377 | #endif | |
378 | } | |
379 | ||
380 | static void put_buffer(GDBState *s, const uint8_t *buf, int len) | |
381 | { | |
382 | #ifdef CONFIG_USER_ONLY | |
383 | int ret; | |
384 | ||
385 | while (len > 0) { | |
386 | ret = send(s->fd, buf, len, 0); | |
387 | if (ret < 0) { | |
388 | if (errno != EINTR && errno != EAGAIN) | |
389 | return; | |
390 | } else { | |
391 | buf += ret; | |
392 | len -= ret; | |
393 | } | |
394 | } | |
395 | #else | |
396 | qemu_chr_fe_write(s->chr, buf, len); | |
397 | #endif | |
398 | } | |
399 | ||
400 | static inline int fromhex(int v) | |
401 | { | |
402 | if (v >= '0' && v <= '9') | |
403 | return v - '0'; | |
404 | else if (v >= 'A' && v <= 'F') | |
405 | return v - 'A' + 10; | |
406 | else if (v >= 'a' && v <= 'f') | |
407 | return v - 'a' + 10; | |
408 | else | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static inline int tohex(int v) | |
413 | { | |
414 | if (v < 10) | |
415 | return v + '0'; | |
416 | else | |
417 | return v - 10 + 'a'; | |
418 | } | |
419 | ||
420 | static void memtohex(char *buf, const uint8_t *mem, int len) | |
421 | { | |
422 | int i, c; | |
423 | char *q; | |
424 | q = buf; | |
425 | for(i = 0; i < len; i++) { | |
426 | c = mem[i]; | |
427 | *q++ = tohex(c >> 4); | |
428 | *q++ = tohex(c & 0xf); | |
429 | } | |
430 | *q = '\0'; | |
431 | } | |
432 | ||
433 | static void hextomem(uint8_t *mem, const char *buf, int len) | |
434 | { | |
435 | int i; | |
436 | ||
437 | for(i = 0; i < len; i++) { | |
438 | mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]); | |
439 | buf += 2; | |
440 | } | |
441 | } | |
442 | ||
443 | /* return -1 if error, 0 if OK */ | |
444 | static int put_packet_binary(GDBState *s, const char *buf, int len) | |
445 | { | |
446 | int csum, i; | |
447 | uint8_t *p; | |
448 | ||
449 | for(;;) { | |
450 | p = s->last_packet; | |
451 | *(p++) = '$'; | |
452 | memcpy(p, buf, len); | |
453 | p += len; | |
454 | csum = 0; | |
455 | for(i = 0; i < len; i++) { | |
456 | csum += buf[i]; | |
457 | } | |
458 | *(p++) = '#'; | |
459 | *(p++) = tohex((csum >> 4) & 0xf); | |
460 | *(p++) = tohex((csum) & 0xf); | |
461 | ||
462 | s->last_packet_len = p - s->last_packet; | |
463 | put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); | |
464 | ||
465 | #ifdef CONFIG_USER_ONLY | |
466 | i = get_char(s); | |
467 | if (i < 0) | |
468 | return -1; | |
469 | if (i == '+') | |
470 | break; | |
471 | #else | |
472 | break; | |
473 | #endif | |
474 | } | |
475 | return 0; | |
476 | } | |
477 | ||
478 | /* return -1 if error, 0 if OK */ | |
479 | static int put_packet(GDBState *s, const char *buf) | |
480 | { | |
481 | #ifdef DEBUG_GDB | |
482 | printf("reply='%s'\n", buf); | |
483 | #endif | |
484 | ||
485 | return put_packet_binary(s, buf, strlen(buf)); | |
486 | } | |
487 | ||
488 | /* Encode data using the encoding for 'x' packets. */ | |
489 | static int memtox(char *buf, const char *mem, int len) | |
490 | { | |
491 | char *p = buf; | |
492 | char c; | |
493 | ||
494 | while (len--) { | |
495 | c = *(mem++); | |
496 | switch (c) { | |
497 | case '#': case '$': case '*': case '}': | |
498 | *(p++) = '}'; | |
499 | *(p++) = c ^ 0x20; | |
500 | break; | |
501 | default: | |
502 | *(p++) = c; | |
503 | break; | |
504 | } | |
505 | } | |
506 | return p - buf; | |
507 | } | |
508 | ||
509 | static const char *get_feature_xml(const char *p, const char **newp, | |
510 | CPUClass *cc) | |
511 | { | |
512 | size_t len; | |
513 | int i; | |
514 | const char *name; | |
515 | static char target_xml[1024]; | |
516 | ||
517 | len = 0; | |
518 | while (p[len] && p[len] != ':') | |
519 | len++; | |
520 | *newp = p + len; | |
521 | ||
522 | name = NULL; | |
523 | if (strncmp(p, "target.xml", len) == 0) { | |
524 | /* Generate the XML description for this CPU. */ | |
525 | if (!target_xml[0]) { | |
526 | GDBRegisterState *r; | |
527 | CPUState *cpu = first_cpu; | |
528 | ||
529 | snprintf(target_xml, sizeof(target_xml), | |
530 | "<?xml version=\"1.0\"?>" | |
531 | "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">" | |
532 | "<target>" | |
533 | "<xi:include href=\"%s\"/>", | |
534 | cc->gdb_core_xml_file); | |
535 | ||
536 | for (r = cpu->gdb_regs; r; r = r->next) { | |
537 | pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\""); | |
538 | pstrcat(target_xml, sizeof(target_xml), r->xml); | |
539 | pstrcat(target_xml, sizeof(target_xml), "\"/>"); | |
540 | } | |
541 | pstrcat(target_xml, sizeof(target_xml), "</target>"); | |
542 | } | |
543 | return target_xml; | |
544 | } | |
545 | for (i = 0; ; i++) { | |
546 | name = xml_builtin[i][0]; | |
547 | if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len)) | |
548 | break; | |
549 | } | |
550 | return name ? xml_builtin[i][1] : NULL; | |
551 | } | |
552 | ||
553 | static int gdb_read_register(CPUState *cpu, uint8_t *mem_buf, int reg) | |
554 | { | |
555 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
556 | CPUArchState *env = cpu->env_ptr; | |
557 | GDBRegisterState *r; | |
558 | ||
559 | if (reg < cc->gdb_num_core_regs) { | |
560 | return cc->gdb_read_register(cpu, mem_buf, reg); | |
561 | } | |
562 | ||
563 | for (r = cpu->gdb_regs; r; r = r->next) { | |
564 | if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { | |
565 | return r->get_reg(env, mem_buf, reg - r->base_reg); | |
566 | } | |
567 | } | |
568 | return 0; | |
569 | } | |
570 | ||
571 | static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) | |
572 | { | |
573 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
574 | CPUArchState *env = cpu->env_ptr; | |
575 | GDBRegisterState *r; | |
576 | ||
577 | if (reg < cc->gdb_num_core_regs) { | |
578 | return cc->gdb_write_register(cpu, mem_buf, reg); | |
579 | } | |
580 | ||
581 | for (r = cpu->gdb_regs; r; r = r->next) { | |
582 | if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { | |
583 | return r->set_reg(env, mem_buf, reg - r->base_reg); | |
584 | } | |
585 | } | |
586 | return 0; | |
587 | } | |
588 | ||
589 | /* Register a supplemental set of CPU registers. If g_pos is nonzero it | |
590 | specifies the first register number and these registers are included in | |
591 | a standard "g" packet. Direction is relative to gdb, i.e. get_reg is | |
592 | gdb reading a CPU register, and set_reg is gdb modifying a CPU register. | |
593 | */ | |
594 | ||
595 | void gdb_register_coprocessor(CPUState *cpu, | |
596 | gdb_reg_cb get_reg, gdb_reg_cb set_reg, | |
597 | int num_regs, const char *xml, int g_pos) | |
598 | { | |
599 | GDBRegisterState *s; | |
600 | GDBRegisterState **p; | |
601 | ||
602 | p = &cpu->gdb_regs; | |
603 | while (*p) { | |
604 | /* Check for duplicates. */ | |
605 | if (strcmp((*p)->xml, xml) == 0) | |
606 | return; | |
607 | p = &(*p)->next; | |
608 | } | |
609 | ||
610 | s = g_new0(GDBRegisterState, 1); | |
611 | s->base_reg = cpu->gdb_num_regs; | |
612 | s->num_regs = num_regs; | |
613 | s->get_reg = get_reg; | |
614 | s->set_reg = set_reg; | |
615 | s->xml = xml; | |
616 | ||
617 | /* Add to end of list. */ | |
618 | cpu->gdb_num_regs += num_regs; | |
619 | *p = s; | |
620 | if (g_pos) { | |
621 | if (g_pos != s->base_reg) { | |
622 | fprintf(stderr, "Error: Bad gdb register numbering for '%s'\n" | |
623 | "Expected %d got %d\n", xml, g_pos, s->base_reg); | |
624 | } else { | |
625 | cpu->gdb_num_g_regs = cpu->gdb_num_regs; | |
626 | } | |
627 | } | |
628 | } | |
629 | ||
630 | #ifndef CONFIG_USER_ONLY | |
631 | static const int xlat_gdb_type[] = { | |
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 | #endif | |
637 | ||
638 | static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type) | |
639 | { | |
640 | CPUState *cpu; | |
641 | CPUArchState *env; | |
642 | int err = 0; | |
643 | ||
644 | if (kvm_enabled()) { | |
645 | return kvm_insert_breakpoint(gdbserver_state->c_cpu, addr, len, type); | |
646 | } | |
647 | ||
648 | switch (type) { | |
649 | case GDB_BREAKPOINT_SW: | |
650 | case GDB_BREAKPOINT_HW: | |
651 | CPU_FOREACH(cpu) { | |
652 | env = cpu->env_ptr; | |
653 | err = cpu_breakpoint_insert(env, addr, BP_GDB, NULL); | |
654 | if (err) | |
655 | break; | |
656 | } | |
657 | return err; | |
658 | #ifndef CONFIG_USER_ONLY | |
659 | case GDB_WATCHPOINT_WRITE: | |
660 | case GDB_WATCHPOINT_READ: | |
661 | case GDB_WATCHPOINT_ACCESS: | |
662 | CPU_FOREACH(cpu) { | |
663 | env = cpu->env_ptr; | |
664 | err = cpu_watchpoint_insert(env, addr, len, xlat_gdb_type[type], | |
665 | NULL); | |
666 | if (err) | |
667 | break; | |
668 | } | |
669 | return err; | |
670 | #endif | |
671 | default: | |
672 | return -ENOSYS; | |
673 | } | |
674 | } | |
675 | ||
676 | static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type) | |
677 | { | |
678 | CPUState *cpu; | |
679 | CPUArchState *env; | |
680 | int err = 0; | |
681 | ||
682 | if (kvm_enabled()) { | |
683 | return kvm_remove_breakpoint(gdbserver_state->c_cpu, addr, len, type); | |
684 | } | |
685 | ||
686 | switch (type) { | |
687 | case GDB_BREAKPOINT_SW: | |
688 | case GDB_BREAKPOINT_HW: | |
689 | CPU_FOREACH(cpu) { | |
690 | env = cpu->env_ptr; | |
691 | err = cpu_breakpoint_remove(env, addr, BP_GDB); | |
692 | if (err) | |
693 | break; | |
694 | } | |
695 | return err; | |
696 | #ifndef CONFIG_USER_ONLY | |
697 | case GDB_WATCHPOINT_WRITE: | |
698 | case GDB_WATCHPOINT_READ: | |
699 | case GDB_WATCHPOINT_ACCESS: | |
700 | CPU_FOREACH(cpu) { | |
701 | env = cpu->env_ptr; | |
702 | err = cpu_watchpoint_remove(env, addr, len, xlat_gdb_type[type]); | |
703 | if (err) | |
704 | break; | |
705 | } | |
706 | return err; | |
707 | #endif | |
708 | default: | |
709 | return -ENOSYS; | |
710 | } | |
711 | } | |
712 | ||
713 | static void gdb_breakpoint_remove_all(void) | |
714 | { | |
715 | CPUState *cpu; | |
716 | CPUArchState *env; | |
717 | ||
718 | if (kvm_enabled()) { | |
719 | kvm_remove_all_breakpoints(gdbserver_state->c_cpu); | |
720 | return; | |
721 | } | |
722 | ||
723 | CPU_FOREACH(cpu) { | |
724 | env = cpu->env_ptr; | |
725 | cpu_breakpoint_remove_all(env, BP_GDB); | |
726 | #ifndef CONFIG_USER_ONLY | |
727 | cpu_watchpoint_remove_all(env, BP_GDB); | |
728 | #endif | |
729 | } | |
730 | } | |
731 | ||
732 | static void gdb_set_cpu_pc(GDBState *s, target_ulong pc) | |
733 | { | |
734 | CPUState *cpu = s->c_cpu; | |
735 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
736 | ||
737 | cpu_synchronize_state(cpu); | |
738 | if (cc->set_pc) { | |
739 | cc->set_pc(cpu, pc); | |
740 | } | |
741 | } | |
742 | ||
743 | static CPUState *find_cpu(uint32_t thread_id) | |
744 | { | |
745 | CPUState *cpu; | |
746 | ||
747 | CPU_FOREACH(cpu) { | |
748 | if (cpu_index(cpu) == thread_id) { | |
749 | return cpu; | |
750 | } | |
751 | } | |
752 | ||
753 | return NULL; | |
754 | } | |
755 | ||
756 | static int gdb_handle_packet(GDBState *s, const char *line_buf) | |
757 | { | |
758 | CPUState *cpu; | |
759 | CPUClass *cc; | |
760 | const char *p; | |
761 | uint32_t thread; | |
762 | int ch, reg_size, type, res; | |
763 | char buf[MAX_PACKET_LENGTH]; | |
764 | uint8_t mem_buf[MAX_PACKET_LENGTH]; | |
765 | uint8_t *registers; | |
766 | target_ulong addr, len; | |
767 | ||
768 | #ifdef DEBUG_GDB | |
769 | printf("command='%s'\n", line_buf); | |
770 | #endif | |
771 | p = line_buf; | |
772 | ch = *p++; | |
773 | switch(ch) { | |
774 | case '?': | |
775 | /* TODO: Make this return the correct value for user-mode. */ | |
776 | snprintf(buf, sizeof(buf), "T%02xthread:%02x;", GDB_SIGNAL_TRAP, | |
777 | cpu_index(s->c_cpu)); | |
778 | put_packet(s, buf); | |
779 | /* Remove all the breakpoints when this query is issued, | |
780 | * because gdb is doing and initial connect and the state | |
781 | * should be cleaned up. | |
782 | */ | |
783 | gdb_breakpoint_remove_all(); | |
784 | break; | |
785 | case 'c': | |
786 | if (*p != '\0') { | |
787 | addr = strtoull(p, (char **)&p, 16); | |
788 | gdb_set_cpu_pc(s, addr); | |
789 | } | |
790 | s->signal = 0; | |
791 | gdb_continue(s); | |
792 | return RS_IDLE; | |
793 | case 'C': | |
794 | s->signal = gdb_signal_to_target (strtoul(p, (char **)&p, 16)); | |
795 | if (s->signal == -1) | |
796 | s->signal = 0; | |
797 | gdb_continue(s); | |
798 | return RS_IDLE; | |
799 | case 'v': | |
800 | if (strncmp(p, "Cont", 4) == 0) { | |
801 | int res_signal, res_thread; | |
802 | ||
803 | p += 4; | |
804 | if (*p == '?') { | |
805 | put_packet(s, "vCont;c;C;s;S"); | |
806 | break; | |
807 | } | |
808 | res = 0; | |
809 | res_signal = 0; | |
810 | res_thread = 0; | |
811 | while (*p) { | |
812 | int action, signal; | |
813 | ||
814 | if (*p++ != ';') { | |
815 | res = 0; | |
816 | break; | |
817 | } | |
818 | action = *p++; | |
819 | signal = 0; | |
820 | if (action == 'C' || action == 'S') { | |
821 | signal = strtoul(p, (char **)&p, 16); | |
822 | } else if (action != 'c' && action != 's') { | |
823 | res = 0; | |
824 | break; | |
825 | } | |
826 | thread = 0; | |
827 | if (*p == ':') { | |
828 | thread = strtoull(p+1, (char **)&p, 16); | |
829 | } | |
830 | action = tolower(action); | |
831 | if (res == 0 || (res == 'c' && action == 's')) { | |
832 | res = action; | |
833 | res_signal = signal; | |
834 | res_thread = thread; | |
835 | } | |
836 | } | |
837 | if (res) { | |
838 | if (res_thread != -1 && res_thread != 0) { | |
839 | cpu = find_cpu(res_thread); | |
840 | if (cpu == NULL) { | |
841 | put_packet(s, "E22"); | |
842 | break; | |
843 | } | |
844 | s->c_cpu = cpu; | |
845 | } | |
846 | if (res == 's') { | |
847 | cpu_single_step(s->c_cpu, sstep_flags); | |
848 | } | |
849 | s->signal = res_signal; | |
850 | gdb_continue(s); | |
851 | return RS_IDLE; | |
852 | } | |
853 | break; | |
854 | } else { | |
855 | goto unknown_command; | |
856 | } | |
857 | case 'k': | |
858 | #ifdef CONFIG_USER_ONLY | |
859 | /* Kill the target */ | |
860 | fprintf(stderr, "\nQEMU: Terminated via GDBstub\n"); | |
861 | exit(0); | |
862 | #endif | |
863 | case 'D': | |
864 | /* Detach packet */ | |
865 | gdb_breakpoint_remove_all(); | |
866 | gdb_syscall_mode = GDB_SYS_DISABLED; | |
867 | gdb_continue(s); | |
868 | put_packet(s, "OK"); | |
869 | break; | |
870 | case 's': | |
871 | if (*p != '\0') { | |
872 | addr = strtoull(p, (char **)&p, 16); | |
873 | gdb_set_cpu_pc(s, addr); | |
874 | } | |
875 | cpu_single_step(s->c_cpu, sstep_flags); | |
876 | gdb_continue(s); | |
877 | return RS_IDLE; | |
878 | case 'F': | |
879 | { | |
880 | target_ulong ret; | |
881 | target_ulong err; | |
882 | ||
883 | ret = strtoull(p, (char **)&p, 16); | |
884 | if (*p == ',') { | |
885 | p++; | |
886 | err = strtoull(p, (char **)&p, 16); | |
887 | } else { | |
888 | err = 0; | |
889 | } | |
890 | if (*p == ',') | |
891 | p++; | |
892 | type = *p; | |
893 | if (s->current_syscall_cb) { | |
894 | s->current_syscall_cb(s->c_cpu, ret, err); | |
895 | s->current_syscall_cb = NULL; | |
896 | } | |
897 | if (type == 'C') { | |
898 | put_packet(s, "T02"); | |
899 | } else { | |
900 | gdb_continue(s); | |
901 | } | |
902 | } | |
903 | break; | |
904 | case 'g': | |
905 | cpu_synchronize_state(s->g_cpu); | |
906 | len = 0; | |
907 | for (addr = 0; addr < s->g_cpu->gdb_num_g_regs; addr++) { | |
908 | reg_size = gdb_read_register(s->g_cpu, mem_buf + len, addr); | |
909 | len += reg_size; | |
910 | } | |
911 | memtohex(buf, mem_buf, len); | |
912 | put_packet(s, buf); | |
913 | break; | |
914 | case 'G': | |
915 | cpu_synchronize_state(s->g_cpu); | |
916 | registers = mem_buf; | |
917 | len = strlen(p) / 2; | |
918 | hextomem((uint8_t *)registers, p, len); | |
919 | for (addr = 0; addr < s->g_cpu->gdb_num_g_regs && len > 0; addr++) { | |
920 | reg_size = gdb_write_register(s->g_cpu, registers, addr); | |
921 | len -= reg_size; | |
922 | registers += reg_size; | |
923 | } | |
924 | put_packet(s, "OK"); | |
925 | break; | |
926 | case 'm': | |
927 | addr = strtoull(p, (char **)&p, 16); | |
928 | if (*p == ',') | |
929 | p++; | |
930 | len = strtoull(p, NULL, 16); | |
931 | if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, false) != 0) { | |
932 | put_packet (s, "E14"); | |
933 | } else { | |
934 | memtohex(buf, mem_buf, len); | |
935 | put_packet(s, buf); | |
936 | } | |
937 | break; | |
938 | case 'M': | |
939 | addr = strtoull(p, (char **)&p, 16); | |
940 | if (*p == ',') | |
941 | p++; | |
942 | len = strtoull(p, (char **)&p, 16); | |
943 | if (*p == ':') | |
944 | p++; | |
945 | hextomem(mem_buf, p, len); | |
946 | if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, | |
947 | true) != 0) { | |
948 | put_packet(s, "E14"); | |
949 | } else { | |
950 | put_packet(s, "OK"); | |
951 | } | |
952 | break; | |
953 | case 'p': | |
954 | /* Older gdb are really dumb, and don't use 'g' if 'p' is avaialable. | |
955 | This works, but can be very slow. Anything new enough to | |
956 | understand XML also knows how to use this properly. */ | |
957 | if (!gdb_has_xml) | |
958 | goto unknown_command; | |
959 | addr = strtoull(p, (char **)&p, 16); | |
960 | reg_size = gdb_read_register(s->g_cpu, mem_buf, addr); | |
961 | if (reg_size) { | |
962 | memtohex(buf, mem_buf, reg_size); | |
963 | put_packet(s, buf); | |
964 | } else { | |
965 | put_packet(s, "E14"); | |
966 | } | |
967 | break; | |
968 | case 'P': | |
969 | if (!gdb_has_xml) | |
970 | goto unknown_command; | |
971 | addr = strtoull(p, (char **)&p, 16); | |
972 | if (*p == '=') | |
973 | p++; | |
974 | reg_size = strlen(p) / 2; | |
975 | hextomem(mem_buf, p, reg_size); | |
976 | gdb_write_register(s->g_cpu, mem_buf, addr); | |
977 | put_packet(s, "OK"); | |
978 | break; | |
979 | case 'Z': | |
980 | case 'z': | |
981 | type = strtoul(p, (char **)&p, 16); | |
982 | if (*p == ',') | |
983 | p++; | |
984 | addr = strtoull(p, (char **)&p, 16); | |
985 | if (*p == ',') | |
986 | p++; | |
987 | len = strtoull(p, (char **)&p, 16); | |
988 | if (ch == 'Z') | |
989 | res = gdb_breakpoint_insert(addr, len, type); | |
990 | else | |
991 | res = gdb_breakpoint_remove(addr, len, type); | |
992 | if (res >= 0) | |
993 | put_packet(s, "OK"); | |
994 | else if (res == -ENOSYS) | |
995 | put_packet(s, ""); | |
996 | else | |
997 | put_packet(s, "E22"); | |
998 | break; | |
999 | case 'H': | |
1000 | type = *p++; | |
1001 | thread = strtoull(p, (char **)&p, 16); | |
1002 | if (thread == -1 || thread == 0) { | |
1003 | put_packet(s, "OK"); | |
1004 | break; | |
1005 | } | |
1006 | cpu = find_cpu(thread); | |
1007 | if (cpu == NULL) { | |
1008 | put_packet(s, "E22"); | |
1009 | break; | |
1010 | } | |
1011 | switch (type) { | |
1012 | case 'c': | |
1013 | s->c_cpu = cpu; | |
1014 | put_packet(s, "OK"); | |
1015 | break; | |
1016 | case 'g': | |
1017 | s->g_cpu = cpu; | |
1018 | put_packet(s, "OK"); | |
1019 | break; | |
1020 | default: | |
1021 | put_packet(s, "E22"); | |
1022 | break; | |
1023 | } | |
1024 | break; | |
1025 | case 'T': | |
1026 | thread = strtoull(p, (char **)&p, 16); | |
1027 | cpu = find_cpu(thread); | |
1028 | ||
1029 | if (cpu != NULL) { | |
1030 | put_packet(s, "OK"); | |
1031 | } else { | |
1032 | put_packet(s, "E22"); | |
1033 | } | |
1034 | break; | |
1035 | case 'q': | |
1036 | case 'Q': | |
1037 | /* parse any 'q' packets here */ | |
1038 | if (!strcmp(p,"qemu.sstepbits")) { | |
1039 | /* Query Breakpoint bit definitions */ | |
1040 | snprintf(buf, sizeof(buf), "ENABLE=%x,NOIRQ=%x,NOTIMER=%x", | |
1041 | SSTEP_ENABLE, | |
1042 | SSTEP_NOIRQ, | |
1043 | SSTEP_NOTIMER); | |
1044 | put_packet(s, buf); | |
1045 | break; | |
1046 | } else if (strncmp(p,"qemu.sstep",10) == 0) { | |
1047 | /* Display or change the sstep_flags */ | |
1048 | p += 10; | |
1049 | if (*p != '=') { | |
1050 | /* Display current setting */ | |
1051 | snprintf(buf, sizeof(buf), "0x%x", sstep_flags); | |
1052 | put_packet(s, buf); | |
1053 | break; | |
1054 | } | |
1055 | p++; | |
1056 | type = strtoul(p, (char **)&p, 16); | |
1057 | sstep_flags = type; | |
1058 | put_packet(s, "OK"); | |
1059 | break; | |
1060 | } else if (strcmp(p,"C") == 0) { | |
1061 | /* "Current thread" remains vague in the spec, so always return | |
1062 | * the first CPU (gdb returns the first thread). */ | |
1063 | put_packet(s, "QC1"); | |
1064 | break; | |
1065 | } else if (strcmp(p,"fThreadInfo") == 0) { | |
1066 | s->query_cpu = first_cpu; | |
1067 | goto report_cpuinfo; | |
1068 | } else if (strcmp(p,"sThreadInfo") == 0) { | |
1069 | report_cpuinfo: | |
1070 | if (s->query_cpu) { | |
1071 | snprintf(buf, sizeof(buf), "m%x", cpu_index(s->query_cpu)); | |
1072 | put_packet(s, buf); | |
1073 | s->query_cpu = CPU_NEXT(s->query_cpu); | |
1074 | } else | |
1075 | put_packet(s, "l"); | |
1076 | break; | |
1077 | } else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) { | |
1078 | thread = strtoull(p+16, (char **)&p, 16); | |
1079 | cpu = find_cpu(thread); | |
1080 | if (cpu != NULL) { | |
1081 | cpu_synchronize_state(cpu); | |
1082 | len = snprintf((char *)mem_buf, sizeof(mem_buf), | |
1083 | "CPU#%d [%s]", cpu->cpu_index, | |
1084 | cpu->halted ? "halted " : "running"); | |
1085 | memtohex(buf, mem_buf, len); | |
1086 | put_packet(s, buf); | |
1087 | } | |
1088 | break; | |
1089 | } | |
1090 | #ifdef CONFIG_USER_ONLY | |
1091 | else if (strncmp(p, "Offsets", 7) == 0) { | |
1092 | CPUArchState *env = s->c_cpu->env_ptr; | |
1093 | TaskState *ts = env->opaque; | |
1094 | ||
1095 | snprintf(buf, sizeof(buf), | |
1096 | "Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx | |
1097 | ";Bss=" TARGET_ABI_FMT_lx, | |
1098 | ts->info->code_offset, | |
1099 | ts->info->data_offset, | |
1100 | ts->info->data_offset); | |
1101 | put_packet(s, buf); | |
1102 | break; | |
1103 | } | |
1104 | #else /* !CONFIG_USER_ONLY */ | |
1105 | else if (strncmp(p, "Rcmd,", 5) == 0) { | |
1106 | int len = strlen(p + 5); | |
1107 | ||
1108 | if ((len % 2) != 0) { | |
1109 | put_packet(s, "E01"); | |
1110 | break; | |
1111 | } | |
1112 | hextomem(mem_buf, p + 5, len); | |
1113 | len = len / 2; | |
1114 | mem_buf[len++] = 0; | |
1115 | qemu_chr_be_write(s->mon_chr, mem_buf, len); | |
1116 | put_packet(s, "OK"); | |
1117 | break; | |
1118 | } | |
1119 | #endif /* !CONFIG_USER_ONLY */ | |
1120 | if (strncmp(p, "Supported", 9) == 0) { | |
1121 | snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH); | |
1122 | cc = CPU_GET_CLASS(first_cpu); | |
1123 | if (cc->gdb_core_xml_file != NULL) { | |
1124 | pstrcat(buf, sizeof(buf), ";qXfer:features:read+"); | |
1125 | } | |
1126 | put_packet(s, buf); | |
1127 | break; | |
1128 | } | |
1129 | if (strncmp(p, "Xfer:features:read:", 19) == 0) { | |
1130 | const char *xml; | |
1131 | target_ulong total_len; | |
1132 | ||
1133 | cc = CPU_GET_CLASS(first_cpu); | |
1134 | if (cc->gdb_core_xml_file == NULL) { | |
1135 | goto unknown_command; | |
1136 | } | |
1137 | ||
1138 | gdb_has_xml = true; | |
1139 | p += 19; | |
1140 | xml = get_feature_xml(p, &p, cc); | |
1141 | if (!xml) { | |
1142 | snprintf(buf, sizeof(buf), "E00"); | |
1143 | put_packet(s, buf); | |
1144 | break; | |
1145 | } | |
1146 | ||
1147 | if (*p == ':') | |
1148 | p++; | |
1149 | addr = strtoul(p, (char **)&p, 16); | |
1150 | if (*p == ',') | |
1151 | p++; | |
1152 | len = strtoul(p, (char **)&p, 16); | |
1153 | ||
1154 | total_len = strlen(xml); | |
1155 | if (addr > total_len) { | |
1156 | snprintf(buf, sizeof(buf), "E00"); | |
1157 | put_packet(s, buf); | |
1158 | break; | |
1159 | } | |
1160 | if (len > (MAX_PACKET_LENGTH - 5) / 2) | |
1161 | len = (MAX_PACKET_LENGTH - 5) / 2; | |
1162 | if (len < total_len - addr) { | |
1163 | buf[0] = 'm'; | |
1164 | len = memtox(buf + 1, xml + addr, len); | |
1165 | } else { | |
1166 | buf[0] = 'l'; | |
1167 | len = memtox(buf + 1, xml + addr, total_len - addr); | |
1168 | } | |
1169 | put_packet_binary(s, buf, len + 1); | |
1170 | break; | |
1171 | } | |
1172 | /* Unrecognised 'q' command. */ | |
1173 | goto unknown_command; | |
1174 | ||
1175 | default: | |
1176 | unknown_command: | |
1177 | /* put empty packet */ | |
1178 | buf[0] = '\0'; | |
1179 | put_packet(s, buf); | |
1180 | break; | |
1181 | } | |
1182 | return RS_IDLE; | |
1183 | } | |
1184 | ||
1185 | void gdb_set_stop_cpu(CPUState *cpu) | |
1186 | { | |
1187 | gdbserver_state->c_cpu = cpu; | |
1188 | gdbserver_state->g_cpu = cpu; | |
1189 | } | |
1190 | ||
1191 | #ifndef CONFIG_USER_ONLY | |
1192 | static void gdb_vm_state_change(void *opaque, int running, RunState state) | |
1193 | { | |
1194 | GDBState *s = gdbserver_state; | |
1195 | CPUArchState *env = s->c_cpu->env_ptr; | |
1196 | CPUState *cpu = s->c_cpu; | |
1197 | char buf[256]; | |
1198 | const char *type; | |
1199 | int ret; | |
1200 | ||
1201 | if (running || s->state == RS_INACTIVE) { | |
1202 | return; | |
1203 | } | |
1204 | /* Is there a GDB syscall waiting to be sent? */ | |
1205 | if (s->current_syscall_cb) { | |
1206 | put_packet(s, s->syscall_buf); | |
1207 | return; | |
1208 | } | |
1209 | switch (state) { | |
1210 | case RUN_STATE_DEBUG: | |
1211 | if (env->watchpoint_hit) { | |
1212 | switch (env->watchpoint_hit->flags & BP_MEM_ACCESS) { | |
1213 | case BP_MEM_READ: | |
1214 | type = "r"; | |
1215 | break; | |
1216 | case BP_MEM_ACCESS: | |
1217 | type = "a"; | |
1218 | break; | |
1219 | default: | |
1220 | type = ""; | |
1221 | break; | |
1222 | } | |
1223 | snprintf(buf, sizeof(buf), | |
1224 | "T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";", | |
1225 | GDB_SIGNAL_TRAP, cpu_index(cpu), type, | |
1226 | env->watchpoint_hit->vaddr); | |
1227 | env->watchpoint_hit = NULL; | |
1228 | goto send_packet; | |
1229 | } | |
1230 | tb_flush(env); | |
1231 | ret = GDB_SIGNAL_TRAP; | |
1232 | break; | |
1233 | case RUN_STATE_PAUSED: | |
1234 | ret = GDB_SIGNAL_INT; | |
1235 | break; | |
1236 | case RUN_STATE_SHUTDOWN: | |
1237 | ret = GDB_SIGNAL_QUIT; | |
1238 | break; | |
1239 | case RUN_STATE_IO_ERROR: | |
1240 | ret = GDB_SIGNAL_IO; | |
1241 | break; | |
1242 | case RUN_STATE_WATCHDOG: | |
1243 | ret = GDB_SIGNAL_ALRM; | |
1244 | break; | |
1245 | case RUN_STATE_INTERNAL_ERROR: | |
1246 | ret = GDB_SIGNAL_ABRT; | |
1247 | break; | |
1248 | case RUN_STATE_SAVE_VM: | |
1249 | case RUN_STATE_RESTORE_VM: | |
1250 | return; | |
1251 | case RUN_STATE_FINISH_MIGRATE: | |
1252 | ret = GDB_SIGNAL_XCPU; | |
1253 | break; | |
1254 | default: | |
1255 | ret = GDB_SIGNAL_UNKNOWN; | |
1256 | break; | |
1257 | } | |
1258 | snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, cpu_index(cpu)); | |
1259 | ||
1260 | send_packet: | |
1261 | put_packet(s, buf); | |
1262 | ||
1263 | /* disable single step if it was enabled */ | |
1264 | cpu_single_step(cpu, 0); | |
1265 | } | |
1266 | #endif | |
1267 | ||
1268 | /* Send a gdb syscall request. | |
1269 | This accepts limited printf-style format specifiers, specifically: | |
1270 | %x - target_ulong argument printed in hex. | |
1271 | %lx - 64-bit argument printed in hex. | |
1272 | %s - string pointer (target_ulong) and length (int) pair. */ | |
1273 | void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) | |
1274 | { | |
1275 | va_list va; | |
1276 | char *p; | |
1277 | char *p_end; | |
1278 | target_ulong addr; | |
1279 | uint64_t i64; | |
1280 | GDBState *s; | |
1281 | ||
1282 | s = gdbserver_state; | |
1283 | if (!s) | |
1284 | return; | |
1285 | s->current_syscall_cb = cb; | |
1286 | #ifndef CONFIG_USER_ONLY | |
1287 | vm_stop(RUN_STATE_DEBUG); | |
1288 | #endif | |
1289 | va_start(va, fmt); | |
1290 | p = s->syscall_buf; | |
1291 | p_end = &s->syscall_buf[sizeof(s->syscall_buf)]; | |
1292 | *(p++) = 'F'; | |
1293 | while (*fmt) { | |
1294 | if (*fmt == '%') { | |
1295 | fmt++; | |
1296 | switch (*fmt++) { | |
1297 | case 'x': | |
1298 | addr = va_arg(va, target_ulong); | |
1299 | p += snprintf(p, p_end - p, TARGET_FMT_lx, addr); | |
1300 | break; | |
1301 | case 'l': | |
1302 | if (*(fmt++) != 'x') | |
1303 | goto bad_format; | |
1304 | i64 = va_arg(va, uint64_t); | |
1305 | p += snprintf(p, p_end - p, "%" PRIx64, i64); | |
1306 | break; | |
1307 | case 's': | |
1308 | addr = va_arg(va, target_ulong); | |
1309 | p += snprintf(p, p_end - p, TARGET_FMT_lx "/%x", | |
1310 | addr, va_arg(va, int)); | |
1311 | break; | |
1312 | default: | |
1313 | bad_format: | |
1314 | fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n", | |
1315 | fmt - 1); | |
1316 | break; | |
1317 | } | |
1318 | } else { | |
1319 | *(p++) = *(fmt++); | |
1320 | } | |
1321 | } | |
1322 | *p = 0; | |
1323 | va_end(va); | |
1324 | #ifdef CONFIG_USER_ONLY | |
1325 | put_packet(s, s->syscall_buf); | |
1326 | gdb_handlesig(s->c_cpu, 0); | |
1327 | #else | |
1328 | /* In this case wait to send the syscall packet until notification that | |
1329 | the CPU has stopped. This must be done because if the packet is sent | |
1330 | now the reply from the syscall request could be received while the CPU | |
1331 | is still in the running state, which can cause packets to be dropped | |
1332 | and state transition 'T' packets to be sent while the syscall is still | |
1333 | being processed. */ | |
1334 | cpu_exit(s->c_cpu); | |
1335 | #endif | |
1336 | } | |
1337 | ||
1338 | static void gdb_read_byte(GDBState *s, int ch) | |
1339 | { | |
1340 | int i, csum; | |
1341 | uint8_t reply; | |
1342 | ||
1343 | #ifndef CONFIG_USER_ONLY | |
1344 | if (s->last_packet_len) { | |
1345 | /* Waiting for a response to the last packet. If we see the start | |
1346 | of a new command then abandon the previous response. */ | |
1347 | if (ch == '-') { | |
1348 | #ifdef DEBUG_GDB | |
1349 | printf("Got NACK, retransmitting\n"); | |
1350 | #endif | |
1351 | put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); | |
1352 | } | |
1353 | #ifdef DEBUG_GDB | |
1354 | else if (ch == '+') | |
1355 | printf("Got ACK\n"); | |
1356 | else | |
1357 | printf("Got '%c' when expecting ACK/NACK\n", ch); | |
1358 | #endif | |
1359 | if (ch == '+' || ch == '$') | |
1360 | s->last_packet_len = 0; | |
1361 | if (ch != '$') | |
1362 | return; | |
1363 | } | |
1364 | if (runstate_is_running()) { | |
1365 | /* when the CPU is running, we cannot do anything except stop | |
1366 | it when receiving a char */ | |
1367 | vm_stop(RUN_STATE_PAUSED); | |
1368 | } else | |
1369 | #endif | |
1370 | { | |
1371 | switch(s->state) { | |
1372 | case RS_IDLE: | |
1373 | if (ch == '$') { | |
1374 | s->line_buf_index = 0; | |
1375 | s->state = RS_GETLINE; | |
1376 | } | |
1377 | break; | |
1378 | case RS_GETLINE: | |
1379 | if (ch == '#') { | |
1380 | s->state = RS_CHKSUM1; | |
1381 | } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { | |
1382 | s->state = RS_IDLE; | |
1383 | } else { | |
1384 | s->line_buf[s->line_buf_index++] = ch; | |
1385 | } | |
1386 | break; | |
1387 | case RS_CHKSUM1: | |
1388 | s->line_buf[s->line_buf_index] = '\0'; | |
1389 | s->line_csum = fromhex(ch) << 4; | |
1390 | s->state = RS_CHKSUM2; | |
1391 | break; | |
1392 | case RS_CHKSUM2: | |
1393 | s->line_csum |= fromhex(ch); | |
1394 | csum = 0; | |
1395 | for(i = 0; i < s->line_buf_index; i++) { | |
1396 | csum += s->line_buf[i]; | |
1397 | } | |
1398 | if (s->line_csum != (csum & 0xff)) { | |
1399 | reply = '-'; | |
1400 | put_buffer(s, &reply, 1); | |
1401 | s->state = RS_IDLE; | |
1402 | } else { | |
1403 | reply = '+'; | |
1404 | put_buffer(s, &reply, 1); | |
1405 | s->state = gdb_handle_packet(s, s->line_buf); | |
1406 | } | |
1407 | break; | |
1408 | default: | |
1409 | abort(); | |
1410 | } | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | /* Tell the remote gdb that the process has exited. */ | |
1415 | void gdb_exit(CPUArchState *env, int code) | |
1416 | { | |
1417 | GDBState *s; | |
1418 | char buf[4]; | |
1419 | ||
1420 | s = gdbserver_state; | |
1421 | if (!s) { | |
1422 | return; | |
1423 | } | |
1424 | #ifdef CONFIG_USER_ONLY | |
1425 | if (gdbserver_fd < 0 || s->fd < 0) { | |
1426 | return; | |
1427 | } | |
1428 | #endif | |
1429 | ||
1430 | snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code); | |
1431 | put_packet(s, buf); | |
1432 | ||
1433 | #ifndef CONFIG_USER_ONLY | |
1434 | if (s->chr) { | |
1435 | qemu_chr_delete(s->chr); | |
1436 | } | |
1437 | #endif | |
1438 | } | |
1439 | ||
1440 | #ifdef CONFIG_USER_ONLY | |
1441 | int | |
1442 | gdb_queuesig (void) | |
1443 | { | |
1444 | GDBState *s; | |
1445 | ||
1446 | s = gdbserver_state; | |
1447 | ||
1448 | if (gdbserver_fd < 0 || s->fd < 0) | |
1449 | return 0; | |
1450 | else | |
1451 | return 1; | |
1452 | } | |
1453 | ||
1454 | int | |
1455 | gdb_handlesig(CPUState *cpu, int sig) | |
1456 | { | |
1457 | CPUArchState *env = cpu->env_ptr; | |
1458 | GDBState *s; | |
1459 | char buf[256]; | |
1460 | int n; | |
1461 | ||
1462 | s = gdbserver_state; | |
1463 | if (gdbserver_fd < 0 || s->fd < 0) { | |
1464 | return sig; | |
1465 | } | |
1466 | ||
1467 | /* disable single step if it was enabled */ | |
1468 | cpu_single_step(cpu, 0); | |
1469 | tb_flush(env); | |
1470 | ||
1471 | if (sig != 0) { | |
1472 | snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb(sig)); | |
1473 | put_packet(s, buf); | |
1474 | } | |
1475 | /* put_packet() might have detected that the peer terminated the | |
1476 | connection. */ | |
1477 | if (s->fd < 0) { | |
1478 | return sig; | |
1479 | } | |
1480 | ||
1481 | sig = 0; | |
1482 | s->state = RS_IDLE; | |
1483 | s->running_state = 0; | |
1484 | while (s->running_state == 0) { | |
1485 | n = read(s->fd, buf, 256); | |
1486 | if (n > 0) { | |
1487 | int i; | |
1488 | ||
1489 | for (i = 0; i < n; i++) { | |
1490 | gdb_read_byte(s, buf[i]); | |
1491 | } | |
1492 | } else if (n == 0 || errno != EAGAIN) { | |
1493 | /* XXX: Connection closed. Should probably wait for another | |
1494 | connection before continuing. */ | |
1495 | return sig; | |
1496 | } | |
1497 | } | |
1498 | sig = s->signal; | |
1499 | s->signal = 0; | |
1500 | return sig; | |
1501 | } | |
1502 | ||
1503 | /* Tell the remote gdb that the process has exited due to SIG. */ | |
1504 | void gdb_signalled(CPUArchState *env, int sig) | |
1505 | { | |
1506 | GDBState *s; | |
1507 | char buf[4]; | |
1508 | ||
1509 | s = gdbserver_state; | |
1510 | if (gdbserver_fd < 0 || s->fd < 0) { | |
1511 | return; | |
1512 | } | |
1513 | ||
1514 | snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb(sig)); | |
1515 | put_packet(s, buf); | |
1516 | } | |
1517 | ||
1518 | static void gdb_accept(void) | |
1519 | { | |
1520 | GDBState *s; | |
1521 | struct sockaddr_in sockaddr; | |
1522 | socklen_t len; | |
1523 | int fd; | |
1524 | ||
1525 | for(;;) { | |
1526 | len = sizeof(sockaddr); | |
1527 | fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len); | |
1528 | if (fd < 0 && errno != EINTR) { | |
1529 | perror("accept"); | |
1530 | return; | |
1531 | } else if (fd >= 0) { | |
1532 | #ifndef _WIN32 | |
1533 | fcntl(fd, F_SETFD, FD_CLOEXEC); | |
1534 | #endif | |
1535 | break; | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | /* set short latency */ | |
1540 | socket_set_nodelay(fd); | |
1541 | ||
1542 | s = g_malloc0(sizeof(GDBState)); | |
1543 | s->c_cpu = first_cpu; | |
1544 | s->g_cpu = first_cpu; | |
1545 | s->fd = fd; | |
1546 | gdb_has_xml = false; | |
1547 | ||
1548 | gdbserver_state = s; | |
1549 | ||
1550 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
1551 | } | |
1552 | ||
1553 | static int gdbserver_open(int port) | |
1554 | { | |
1555 | struct sockaddr_in sockaddr; | |
1556 | int fd, val, ret; | |
1557 | ||
1558 | fd = socket(PF_INET, SOCK_STREAM, 0); | |
1559 | if (fd < 0) { | |
1560 | perror("socket"); | |
1561 | return -1; | |
1562 | } | |
1563 | #ifndef _WIN32 | |
1564 | fcntl(fd, F_SETFD, FD_CLOEXEC); | |
1565 | #endif | |
1566 | ||
1567 | /* allow fast reuse */ | |
1568 | val = 1; | |
1569 | qemu_setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)); | |
1570 | ||
1571 | sockaddr.sin_family = AF_INET; | |
1572 | sockaddr.sin_port = htons(port); | |
1573 | sockaddr.sin_addr.s_addr = 0; | |
1574 | ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); | |
1575 | if (ret < 0) { | |
1576 | perror("bind"); | |
1577 | close(fd); | |
1578 | return -1; | |
1579 | } | |
1580 | ret = listen(fd, 0); | |
1581 | if (ret < 0) { | |
1582 | perror("listen"); | |
1583 | close(fd); | |
1584 | return -1; | |
1585 | } | |
1586 | return fd; | |
1587 | } | |
1588 | ||
1589 | int gdbserver_start(int port) | |
1590 | { | |
1591 | gdbserver_fd = gdbserver_open(port); | |
1592 | if (gdbserver_fd < 0) | |
1593 | return -1; | |
1594 | /* accept connections */ | |
1595 | gdb_accept(); | |
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | /* Disable gdb stub for child processes. */ | |
1600 | void gdbserver_fork(CPUArchState *env) | |
1601 | { | |
1602 | GDBState *s = gdbserver_state; | |
1603 | if (gdbserver_fd < 0 || s->fd < 0) | |
1604 | return; | |
1605 | close(s->fd); | |
1606 | s->fd = -1; | |
1607 | cpu_breakpoint_remove_all(env, BP_GDB); | |
1608 | cpu_watchpoint_remove_all(env, BP_GDB); | |
1609 | } | |
1610 | #else | |
1611 | static int gdb_chr_can_receive(void *opaque) | |
1612 | { | |
1613 | /* We can handle an arbitrarily large amount of data. | |
1614 | Pick the maximum packet size, which is as good as anything. */ | |
1615 | return MAX_PACKET_LENGTH; | |
1616 | } | |
1617 | ||
1618 | static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size) | |
1619 | { | |
1620 | int i; | |
1621 | ||
1622 | for (i = 0; i < size; i++) { | |
1623 | gdb_read_byte(gdbserver_state, buf[i]); | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | static void gdb_chr_event(void *opaque, int event) | |
1628 | { | |
1629 | switch (event) { | |
1630 | case CHR_EVENT_OPENED: | |
1631 | vm_stop(RUN_STATE_PAUSED); | |
1632 | gdb_has_xml = false; | |
1633 | break; | |
1634 | default: | |
1635 | break; | |
1636 | } | |
1637 | } | |
1638 | ||
1639 | static void gdb_monitor_output(GDBState *s, const char *msg, int len) | |
1640 | { | |
1641 | char buf[MAX_PACKET_LENGTH]; | |
1642 | ||
1643 | buf[0] = 'O'; | |
1644 | if (len > (MAX_PACKET_LENGTH/2) - 1) | |
1645 | len = (MAX_PACKET_LENGTH/2) - 1; | |
1646 | memtohex(buf + 1, (uint8_t *)msg, len); | |
1647 | put_packet(s, buf); | |
1648 | } | |
1649 | ||
1650 | static int gdb_monitor_write(CharDriverState *chr, const uint8_t *buf, int len) | |
1651 | { | |
1652 | const char *p = (const char *)buf; | |
1653 | int max_sz; | |
1654 | ||
1655 | max_sz = (sizeof(gdbserver_state->last_packet) - 2) / 2; | |
1656 | for (;;) { | |
1657 | if (len <= max_sz) { | |
1658 | gdb_monitor_output(gdbserver_state, p, len); | |
1659 | break; | |
1660 | } | |
1661 | gdb_monitor_output(gdbserver_state, p, max_sz); | |
1662 | p += max_sz; | |
1663 | len -= max_sz; | |
1664 | } | |
1665 | return len; | |
1666 | } | |
1667 | ||
1668 | #ifndef _WIN32 | |
1669 | static void gdb_sigterm_handler(int signal) | |
1670 | { | |
1671 | if (runstate_is_running()) { | |
1672 | vm_stop(RUN_STATE_PAUSED); | |
1673 | } | |
1674 | } | |
1675 | #endif | |
1676 | ||
1677 | int gdbserver_start(const char *device) | |
1678 | { | |
1679 | GDBState *s; | |
1680 | char gdbstub_device_name[128]; | |
1681 | CharDriverState *chr = NULL; | |
1682 | CharDriverState *mon_chr; | |
1683 | ||
1684 | if (!device) | |
1685 | return -1; | |
1686 | if (strcmp(device, "none") != 0) { | |
1687 | if (strstart(device, "tcp:", NULL)) { | |
1688 | /* enforce required TCP attributes */ | |
1689 | snprintf(gdbstub_device_name, sizeof(gdbstub_device_name), | |
1690 | "%s,nowait,nodelay,server", device); | |
1691 | device = gdbstub_device_name; | |
1692 | } | |
1693 | #ifndef _WIN32 | |
1694 | else if (strcmp(device, "stdio") == 0) { | |
1695 | struct sigaction act; | |
1696 | ||
1697 | memset(&act, 0, sizeof(act)); | |
1698 | act.sa_handler = gdb_sigterm_handler; | |
1699 | sigaction(SIGINT, &act, NULL); | |
1700 | } | |
1701 | #endif | |
1702 | chr = qemu_chr_new("gdb", device, NULL); | |
1703 | if (!chr) | |
1704 | return -1; | |
1705 | ||
1706 | qemu_chr_fe_claim_no_fail(chr); | |
1707 | qemu_chr_add_handlers(chr, gdb_chr_can_receive, gdb_chr_receive, | |
1708 | gdb_chr_event, NULL); | |
1709 | } | |
1710 | ||
1711 | s = gdbserver_state; | |
1712 | if (!s) { | |
1713 | s = g_malloc0(sizeof(GDBState)); | |
1714 | gdbserver_state = s; | |
1715 | ||
1716 | qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL); | |
1717 | ||
1718 | /* Initialize a monitor terminal for gdb */ | |
1719 | mon_chr = g_malloc0(sizeof(*mon_chr)); | |
1720 | mon_chr->chr_write = gdb_monitor_write; | |
1721 | monitor_init(mon_chr, 0); | |
1722 | } else { | |
1723 | if (s->chr) | |
1724 | qemu_chr_delete(s->chr); | |
1725 | mon_chr = s->mon_chr; | |
1726 | memset(s, 0, sizeof(GDBState)); | |
1727 | } | |
1728 | s->c_cpu = first_cpu; | |
1729 | s->g_cpu = first_cpu; | |
1730 | s->chr = chr; | |
1731 | s->state = chr ? RS_IDLE : RS_INACTIVE; | |
1732 | s->mon_chr = mon_chr; | |
1733 | s->current_syscall_cb = NULL; | |
1734 | ||
1735 | return 0; | |
1736 | } | |
1737 | #endif |