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1 | /* | |
2 | * gdb server stub | |
3 | * | |
4 | * This implements a subset of the remote protocol as described in: | |
5 | * | |
6 | * https://sourceware.org/gdb/onlinedocs/gdb/Remote-Protocol.html | |
7 | * | |
8 | * Copyright (c) 2003-2005 Fabrice Bellard | |
9 | * | |
10 | * This library is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU Lesser General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public | |
21 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
22 | * | |
23 | * SPDX-License-Identifier: LGPL-2.0+ | |
24 | */ | |
25 | ||
26 | #include "qemu/osdep.h" | |
27 | #include "qemu-common.h" | |
28 | #include "qapi/error.h" | |
29 | #include "qemu/error-report.h" | |
30 | #include "qemu/ctype.h" | |
31 | #include "qemu/cutils.h" | |
32 | #include "qemu/module.h" | |
33 | #include "trace/trace-root.h" | |
34 | #include "exec/gdbstub.h" | |
35 | #ifdef CONFIG_USER_ONLY | |
36 | #include "qemu.h" | |
37 | #else | |
38 | #include "monitor/monitor.h" | |
39 | #include "chardev/char.h" | |
40 | #include "chardev/char-fe.h" | |
41 | #include "hw/cpu/cluster.h" | |
42 | #include "hw/boards.h" | |
43 | #endif | |
44 | ||
45 | #define MAX_PACKET_LENGTH 4096 | |
46 | ||
47 | #include "qemu/sockets.h" | |
48 | #include "sysemu/hw_accel.h" | |
49 | #include "sysemu/kvm.h" | |
50 | #include "sysemu/runstate.h" | |
51 | #include "semihosting/semihost.h" | |
52 | #include "exec/exec-all.h" | |
53 | #include "sysemu/replay.h" | |
54 | ||
55 | #ifdef CONFIG_USER_ONLY | |
56 | #define GDB_ATTACHED "0" | |
57 | #else | |
58 | #define GDB_ATTACHED "1" | |
59 | #endif | |
60 | ||
61 | #ifndef CONFIG_USER_ONLY | |
62 | static int phy_memory_mode; | |
63 | #endif | |
64 | ||
65 | static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr, | |
66 | uint8_t *buf, int len, bool is_write) | |
67 | { | |
68 | CPUClass *cc; | |
69 | ||
70 | #ifndef CONFIG_USER_ONLY | |
71 | if (phy_memory_mode) { | |
72 | if (is_write) { | |
73 | cpu_physical_memory_write(addr, buf, len); | |
74 | } else { | |
75 | cpu_physical_memory_read(addr, buf, len); | |
76 | } | |
77 | return 0; | |
78 | } | |
79 | #endif | |
80 | ||
81 | cc = CPU_GET_CLASS(cpu); | |
82 | if (cc->memory_rw_debug) { | |
83 | return cc->memory_rw_debug(cpu, addr, buf, len, is_write); | |
84 | } | |
85 | return cpu_memory_rw_debug(cpu, addr, buf, len, is_write); | |
86 | } | |
87 | ||
88 | /* Return the GDB index for a given vCPU state. | |
89 | * | |
90 | * For user mode this is simply the thread id. In system mode GDB | |
91 | * numbers CPUs from 1 as 0 is reserved as an "any cpu" index. | |
92 | */ | |
93 | static inline int cpu_gdb_index(CPUState *cpu) | |
94 | { | |
95 | #if defined(CONFIG_USER_ONLY) | |
96 | TaskState *ts = (TaskState *) cpu->opaque; | |
97 | return ts ? ts->ts_tid : -1; | |
98 | #else | |
99 | return cpu->cpu_index + 1; | |
100 | #endif | |
101 | } | |
102 | ||
103 | enum { | |
104 | GDB_SIGNAL_0 = 0, | |
105 | GDB_SIGNAL_INT = 2, | |
106 | GDB_SIGNAL_QUIT = 3, | |
107 | GDB_SIGNAL_TRAP = 5, | |
108 | GDB_SIGNAL_ABRT = 6, | |
109 | GDB_SIGNAL_ALRM = 14, | |
110 | GDB_SIGNAL_IO = 23, | |
111 | GDB_SIGNAL_XCPU = 24, | |
112 | GDB_SIGNAL_UNKNOWN = 143 | |
113 | }; | |
114 | ||
115 | #ifdef CONFIG_USER_ONLY | |
116 | ||
117 | /* Map target signal numbers to GDB protocol signal numbers and vice | |
118 | * versa. For user emulation's currently supported systems, we can | |
119 | * assume most signals are defined. | |
120 | */ | |
121 | ||
122 | static int gdb_signal_table[] = { | |
123 | 0, | |
124 | TARGET_SIGHUP, | |
125 | TARGET_SIGINT, | |
126 | TARGET_SIGQUIT, | |
127 | TARGET_SIGILL, | |
128 | TARGET_SIGTRAP, | |
129 | TARGET_SIGABRT, | |
130 | -1, /* SIGEMT */ | |
131 | TARGET_SIGFPE, | |
132 | TARGET_SIGKILL, | |
133 | TARGET_SIGBUS, | |
134 | TARGET_SIGSEGV, | |
135 | TARGET_SIGSYS, | |
136 | TARGET_SIGPIPE, | |
137 | TARGET_SIGALRM, | |
138 | TARGET_SIGTERM, | |
139 | TARGET_SIGURG, | |
140 | TARGET_SIGSTOP, | |
141 | TARGET_SIGTSTP, | |
142 | TARGET_SIGCONT, | |
143 | TARGET_SIGCHLD, | |
144 | TARGET_SIGTTIN, | |
145 | TARGET_SIGTTOU, | |
146 | TARGET_SIGIO, | |
147 | TARGET_SIGXCPU, | |
148 | TARGET_SIGXFSZ, | |
149 | TARGET_SIGVTALRM, | |
150 | TARGET_SIGPROF, | |
151 | TARGET_SIGWINCH, | |
152 | -1, /* SIGLOST */ | |
153 | TARGET_SIGUSR1, | |
154 | TARGET_SIGUSR2, | |
155 | #ifdef TARGET_SIGPWR | |
156 | TARGET_SIGPWR, | |
157 | #else | |
158 | -1, | |
159 | #endif | |
160 | -1, /* SIGPOLL */ | |
161 | -1, | |
162 | -1, | |
163 | -1, | |
164 | -1, | |
165 | -1, | |
166 | -1, | |
167 | -1, | |
168 | -1, | |
169 | -1, | |
170 | -1, | |
171 | -1, | |
172 | #ifdef __SIGRTMIN | |
173 | __SIGRTMIN + 1, | |
174 | __SIGRTMIN + 2, | |
175 | __SIGRTMIN + 3, | |
176 | __SIGRTMIN + 4, | |
177 | __SIGRTMIN + 5, | |
178 | __SIGRTMIN + 6, | |
179 | __SIGRTMIN + 7, | |
180 | __SIGRTMIN + 8, | |
181 | __SIGRTMIN + 9, | |
182 | __SIGRTMIN + 10, | |
183 | __SIGRTMIN + 11, | |
184 | __SIGRTMIN + 12, | |
185 | __SIGRTMIN + 13, | |
186 | __SIGRTMIN + 14, | |
187 | __SIGRTMIN + 15, | |
188 | __SIGRTMIN + 16, | |
189 | __SIGRTMIN + 17, | |
190 | __SIGRTMIN + 18, | |
191 | __SIGRTMIN + 19, | |
192 | __SIGRTMIN + 20, | |
193 | __SIGRTMIN + 21, | |
194 | __SIGRTMIN + 22, | |
195 | __SIGRTMIN + 23, | |
196 | __SIGRTMIN + 24, | |
197 | __SIGRTMIN + 25, | |
198 | __SIGRTMIN + 26, | |
199 | __SIGRTMIN + 27, | |
200 | __SIGRTMIN + 28, | |
201 | __SIGRTMIN + 29, | |
202 | __SIGRTMIN + 30, | |
203 | __SIGRTMIN + 31, | |
204 | -1, /* SIGCANCEL */ | |
205 | __SIGRTMIN, | |
206 | __SIGRTMIN + 32, | |
207 | __SIGRTMIN + 33, | |
208 | __SIGRTMIN + 34, | |
209 | __SIGRTMIN + 35, | |
210 | __SIGRTMIN + 36, | |
211 | __SIGRTMIN + 37, | |
212 | __SIGRTMIN + 38, | |
213 | __SIGRTMIN + 39, | |
214 | __SIGRTMIN + 40, | |
215 | __SIGRTMIN + 41, | |
216 | __SIGRTMIN + 42, | |
217 | __SIGRTMIN + 43, | |
218 | __SIGRTMIN + 44, | |
219 | __SIGRTMIN + 45, | |
220 | __SIGRTMIN + 46, | |
221 | __SIGRTMIN + 47, | |
222 | __SIGRTMIN + 48, | |
223 | __SIGRTMIN + 49, | |
224 | __SIGRTMIN + 50, | |
225 | __SIGRTMIN + 51, | |
226 | __SIGRTMIN + 52, | |
227 | __SIGRTMIN + 53, | |
228 | __SIGRTMIN + 54, | |
229 | __SIGRTMIN + 55, | |
230 | __SIGRTMIN + 56, | |
231 | __SIGRTMIN + 57, | |
232 | __SIGRTMIN + 58, | |
233 | __SIGRTMIN + 59, | |
234 | __SIGRTMIN + 60, | |
235 | __SIGRTMIN + 61, | |
236 | __SIGRTMIN + 62, | |
237 | __SIGRTMIN + 63, | |
238 | __SIGRTMIN + 64, | |
239 | __SIGRTMIN + 65, | |
240 | __SIGRTMIN + 66, | |
241 | __SIGRTMIN + 67, | |
242 | __SIGRTMIN + 68, | |
243 | __SIGRTMIN + 69, | |
244 | __SIGRTMIN + 70, | |
245 | __SIGRTMIN + 71, | |
246 | __SIGRTMIN + 72, | |
247 | __SIGRTMIN + 73, | |
248 | __SIGRTMIN + 74, | |
249 | __SIGRTMIN + 75, | |
250 | __SIGRTMIN + 76, | |
251 | __SIGRTMIN + 77, | |
252 | __SIGRTMIN + 78, | |
253 | __SIGRTMIN + 79, | |
254 | __SIGRTMIN + 80, | |
255 | __SIGRTMIN + 81, | |
256 | __SIGRTMIN + 82, | |
257 | __SIGRTMIN + 83, | |
258 | __SIGRTMIN + 84, | |
259 | __SIGRTMIN + 85, | |
260 | __SIGRTMIN + 86, | |
261 | __SIGRTMIN + 87, | |
262 | __SIGRTMIN + 88, | |
263 | __SIGRTMIN + 89, | |
264 | __SIGRTMIN + 90, | |
265 | __SIGRTMIN + 91, | |
266 | __SIGRTMIN + 92, | |
267 | __SIGRTMIN + 93, | |
268 | __SIGRTMIN + 94, | |
269 | __SIGRTMIN + 95, | |
270 | -1, /* SIGINFO */ | |
271 | -1, /* UNKNOWN */ | |
272 | -1, /* DEFAULT */ | |
273 | -1, | |
274 | -1, | |
275 | -1, | |
276 | -1, | |
277 | -1, | |
278 | -1 | |
279 | #endif | |
280 | }; | |
281 | #else | |
282 | /* In system mode we only need SIGINT and SIGTRAP; other signals | |
283 | are not yet supported. */ | |
284 | ||
285 | enum { | |
286 | TARGET_SIGINT = 2, | |
287 | TARGET_SIGTRAP = 5 | |
288 | }; | |
289 | ||
290 | static int gdb_signal_table[] = { | |
291 | -1, | |
292 | -1, | |
293 | TARGET_SIGINT, | |
294 | -1, | |
295 | -1, | |
296 | TARGET_SIGTRAP | |
297 | }; | |
298 | #endif | |
299 | ||
300 | #ifdef CONFIG_USER_ONLY | |
301 | static int target_signal_to_gdb (int sig) | |
302 | { | |
303 | int i; | |
304 | for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++) | |
305 | if (gdb_signal_table[i] == sig) | |
306 | return i; | |
307 | return GDB_SIGNAL_UNKNOWN; | |
308 | } | |
309 | #endif | |
310 | ||
311 | static int gdb_signal_to_target (int sig) | |
312 | { | |
313 | if (sig < ARRAY_SIZE (gdb_signal_table)) | |
314 | return gdb_signal_table[sig]; | |
315 | else | |
316 | return -1; | |
317 | } | |
318 | ||
319 | typedef struct GDBRegisterState { | |
320 | int base_reg; | |
321 | int num_regs; | |
322 | gdb_get_reg_cb get_reg; | |
323 | gdb_set_reg_cb set_reg; | |
324 | const char *xml; | |
325 | struct GDBRegisterState *next; | |
326 | } GDBRegisterState; | |
327 | ||
328 | typedef struct GDBProcess { | |
329 | uint32_t pid; | |
330 | bool attached; | |
331 | ||
332 | char target_xml[1024]; | |
333 | } GDBProcess; | |
334 | ||
335 | enum RSState { | |
336 | RS_INACTIVE, | |
337 | RS_IDLE, | |
338 | RS_GETLINE, | |
339 | RS_GETLINE_ESC, | |
340 | RS_GETLINE_RLE, | |
341 | RS_CHKSUM1, | |
342 | RS_CHKSUM2, | |
343 | }; | |
344 | typedef struct GDBState { | |
345 | bool init; /* have we been initialised? */ | |
346 | CPUState *c_cpu; /* current CPU for step/continue ops */ | |
347 | CPUState *g_cpu; /* current CPU for other ops */ | |
348 | CPUState *query_cpu; /* for q{f|s}ThreadInfo */ | |
349 | enum RSState state; /* parsing state */ | |
350 | char line_buf[MAX_PACKET_LENGTH]; | |
351 | int line_buf_index; | |
352 | int line_sum; /* running checksum */ | |
353 | int line_csum; /* checksum at the end of the packet */ | |
354 | GByteArray *last_packet; | |
355 | int signal; | |
356 | #ifdef CONFIG_USER_ONLY | |
357 | int fd; | |
358 | char *socket_path; | |
359 | int running_state; | |
360 | #else | |
361 | CharBackend chr; | |
362 | Chardev *mon_chr; | |
363 | #endif | |
364 | bool multiprocess; | |
365 | GDBProcess *processes; | |
366 | int process_num; | |
367 | char syscall_buf[256]; | |
368 | gdb_syscall_complete_cb current_syscall_cb; | |
369 | GString *str_buf; | |
370 | GByteArray *mem_buf; | |
371 | } GDBState; | |
372 | ||
373 | /* By default use no IRQs and no timers while single stepping so as to | |
374 | * make single stepping like an ICE HW step. | |
375 | */ | |
376 | static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER; | |
377 | ||
378 | /* Retrieves flags for single step mode. */ | |
379 | static int get_sstep_flags(void) | |
380 | { | |
381 | /* | |
382 | * In replay mode all events written into the log should be replayed. | |
383 | * That is why NOIRQ flag is removed in this mode. | |
384 | */ | |
385 | if (replay_mode != REPLAY_MODE_NONE) { | |
386 | return SSTEP_ENABLE; | |
387 | } else { | |
388 | return sstep_flags; | |
389 | } | |
390 | } | |
391 | ||
392 | static GDBState gdbserver_state; | |
393 | ||
394 | static void init_gdbserver_state(void) | |
395 | { | |
396 | g_assert(!gdbserver_state.init); | |
397 | memset(&gdbserver_state, 0, sizeof(GDBState)); | |
398 | gdbserver_state.init = true; | |
399 | gdbserver_state.str_buf = g_string_new(NULL); | |
400 | gdbserver_state.mem_buf = g_byte_array_sized_new(MAX_PACKET_LENGTH); | |
401 | gdbserver_state.last_packet = g_byte_array_sized_new(MAX_PACKET_LENGTH + 4); | |
402 | } | |
403 | ||
404 | #ifndef CONFIG_USER_ONLY | |
405 | static void reset_gdbserver_state(void) | |
406 | { | |
407 | g_free(gdbserver_state.processes); | |
408 | gdbserver_state.processes = NULL; | |
409 | gdbserver_state.process_num = 0; | |
410 | } | |
411 | #endif | |
412 | ||
413 | bool gdb_has_xml; | |
414 | ||
415 | #ifdef CONFIG_USER_ONLY | |
416 | ||
417 | static int get_char(void) | |
418 | { | |
419 | uint8_t ch; | |
420 | int ret; | |
421 | ||
422 | for(;;) { | |
423 | ret = qemu_recv(gdbserver_state.fd, &ch, 1, 0); | |
424 | if (ret < 0) { | |
425 | if (errno == ECONNRESET) | |
426 | gdbserver_state.fd = -1; | |
427 | if (errno != EINTR) | |
428 | return -1; | |
429 | } else if (ret == 0) { | |
430 | close(gdbserver_state.fd); | |
431 | gdbserver_state.fd = -1; | |
432 | return -1; | |
433 | } else { | |
434 | break; | |
435 | } | |
436 | } | |
437 | return ch; | |
438 | } | |
439 | #endif | |
440 | ||
441 | static enum { | |
442 | GDB_SYS_UNKNOWN, | |
443 | GDB_SYS_ENABLED, | |
444 | GDB_SYS_DISABLED, | |
445 | } gdb_syscall_mode; | |
446 | ||
447 | /* Decide if either remote gdb syscalls or native file IO should be used. */ | |
448 | int use_gdb_syscalls(void) | |
449 | { | |
450 | SemihostingTarget target = semihosting_get_target(); | |
451 | if (target == SEMIHOSTING_TARGET_NATIVE) { | |
452 | /* -semihosting-config target=native */ | |
453 | return false; | |
454 | } else if (target == SEMIHOSTING_TARGET_GDB) { | |
455 | /* -semihosting-config target=gdb */ | |
456 | return true; | |
457 | } | |
458 | ||
459 | /* -semihosting-config target=auto */ | |
460 | /* On the first call check if gdb is connected and remember. */ | |
461 | if (gdb_syscall_mode == GDB_SYS_UNKNOWN) { | |
462 | gdb_syscall_mode = gdbserver_state.init ? | |
463 | GDB_SYS_ENABLED : GDB_SYS_DISABLED; | |
464 | } | |
465 | return gdb_syscall_mode == GDB_SYS_ENABLED; | |
466 | } | |
467 | ||
468 | static bool stub_can_reverse(void) | |
469 | { | |
470 | #ifdef CONFIG_USER_ONLY | |
471 | return false; | |
472 | #else | |
473 | return replay_mode == REPLAY_MODE_PLAY; | |
474 | #endif | |
475 | } | |
476 | ||
477 | /* Resume execution. */ | |
478 | static inline void gdb_continue(void) | |
479 | { | |
480 | ||
481 | #ifdef CONFIG_USER_ONLY | |
482 | gdbserver_state.running_state = 1; | |
483 | trace_gdbstub_op_continue(); | |
484 | #else | |
485 | if (!runstate_needs_reset()) { | |
486 | trace_gdbstub_op_continue(); | |
487 | vm_start(); | |
488 | } | |
489 | #endif | |
490 | } | |
491 | ||
492 | /* | |
493 | * Resume execution, per CPU actions. For user-mode emulation it's | |
494 | * equivalent to gdb_continue. | |
495 | */ | |
496 | static int gdb_continue_partial(char *newstates) | |
497 | { | |
498 | CPUState *cpu; | |
499 | int res = 0; | |
500 | #ifdef CONFIG_USER_ONLY | |
501 | /* | |
502 | * This is not exactly accurate, but it's an improvement compared to the | |
503 | * previous situation, where only one CPU would be single-stepped. | |
504 | */ | |
505 | CPU_FOREACH(cpu) { | |
506 | if (newstates[cpu->cpu_index] == 's') { | |
507 | trace_gdbstub_op_stepping(cpu->cpu_index); | |
508 | cpu_single_step(cpu, sstep_flags); | |
509 | } | |
510 | } | |
511 | gdbserver_state.running_state = 1; | |
512 | #else | |
513 | int flag = 0; | |
514 | ||
515 | if (!runstate_needs_reset()) { | |
516 | if (vm_prepare_start()) { | |
517 | return 0; | |
518 | } | |
519 | ||
520 | CPU_FOREACH(cpu) { | |
521 | switch (newstates[cpu->cpu_index]) { | |
522 | case 0: | |
523 | case 1: | |
524 | break; /* nothing to do here */ | |
525 | case 's': | |
526 | trace_gdbstub_op_stepping(cpu->cpu_index); | |
527 | cpu_single_step(cpu, get_sstep_flags()); | |
528 | cpu_resume(cpu); | |
529 | flag = 1; | |
530 | break; | |
531 | case 'c': | |
532 | trace_gdbstub_op_continue_cpu(cpu->cpu_index); | |
533 | cpu_resume(cpu); | |
534 | flag = 1; | |
535 | break; | |
536 | default: | |
537 | res = -1; | |
538 | break; | |
539 | } | |
540 | } | |
541 | } | |
542 | if (flag) { | |
543 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true); | |
544 | } | |
545 | #endif | |
546 | return res; | |
547 | } | |
548 | ||
549 | static void put_buffer(const uint8_t *buf, int len) | |
550 | { | |
551 | #ifdef CONFIG_USER_ONLY | |
552 | int ret; | |
553 | ||
554 | while (len > 0) { | |
555 | ret = send(gdbserver_state.fd, buf, len, 0); | |
556 | if (ret < 0) { | |
557 | if (errno != EINTR) | |
558 | return; | |
559 | } else { | |
560 | buf += ret; | |
561 | len -= ret; | |
562 | } | |
563 | } | |
564 | #else | |
565 | /* XXX this blocks entire thread. Rewrite to use | |
566 | * qemu_chr_fe_write and background I/O callbacks */ | |
567 | qemu_chr_fe_write_all(&gdbserver_state.chr, buf, len); | |
568 | #endif | |
569 | } | |
570 | ||
571 | static inline int fromhex(int v) | |
572 | { | |
573 | if (v >= '0' && v <= '9') | |
574 | return v - '0'; | |
575 | else if (v >= 'A' && v <= 'F') | |
576 | return v - 'A' + 10; | |
577 | else if (v >= 'a' && v <= 'f') | |
578 | return v - 'a' + 10; | |
579 | else | |
580 | return 0; | |
581 | } | |
582 | ||
583 | static inline int tohex(int v) | |
584 | { | |
585 | if (v < 10) | |
586 | return v + '0'; | |
587 | else | |
588 | return v - 10 + 'a'; | |
589 | } | |
590 | ||
591 | /* writes 2*len+1 bytes in buf */ | |
592 | static void memtohex(GString *buf, const uint8_t *mem, int len) | |
593 | { | |
594 | int i, c; | |
595 | for(i = 0; i < len; i++) { | |
596 | c = mem[i]; | |
597 | g_string_append_c(buf, tohex(c >> 4)); | |
598 | g_string_append_c(buf, tohex(c & 0xf)); | |
599 | } | |
600 | g_string_append_c(buf, '\0'); | |
601 | } | |
602 | ||
603 | static void hextomem(GByteArray *mem, const char *buf, int len) | |
604 | { | |
605 | int i; | |
606 | ||
607 | for(i = 0; i < len; i++) { | |
608 | guint8 byte = fromhex(buf[0]) << 4 | fromhex(buf[1]); | |
609 | g_byte_array_append(mem, &byte, 1); | |
610 | buf += 2; | |
611 | } | |
612 | } | |
613 | ||
614 | static void hexdump(const char *buf, int len, | |
615 | void (*trace_fn)(size_t ofs, char const *text)) | |
616 | { | |
617 | char line_buffer[3 * 16 + 4 + 16 + 1]; | |
618 | ||
619 | size_t i; | |
620 | for (i = 0; i < len || (i & 0xF); ++i) { | |
621 | size_t byte_ofs = i & 15; | |
622 | ||
623 | if (byte_ofs == 0) { | |
624 | memset(line_buffer, ' ', 3 * 16 + 4 + 16); | |
625 | line_buffer[3 * 16 + 4 + 16] = 0; | |
626 | } | |
627 | ||
628 | size_t col_group = (i >> 2) & 3; | |
629 | size_t hex_col = byte_ofs * 3 + col_group; | |
630 | size_t txt_col = 3 * 16 + 4 + byte_ofs; | |
631 | ||
632 | if (i < len) { | |
633 | char value = buf[i]; | |
634 | ||
635 | line_buffer[hex_col + 0] = tohex((value >> 4) & 0xF); | |
636 | line_buffer[hex_col + 1] = tohex((value >> 0) & 0xF); | |
637 | line_buffer[txt_col + 0] = (value >= ' ' && value < 127) | |
638 | ? value | |
639 | : '.'; | |
640 | } | |
641 | ||
642 | if (byte_ofs == 0xF) | |
643 | trace_fn(i & -16, line_buffer); | |
644 | } | |
645 | } | |
646 | ||
647 | /* return -1 if error, 0 if OK */ | |
648 | static int put_packet_binary(const char *buf, int len, bool dump) | |
649 | { | |
650 | int csum, i; | |
651 | uint8_t footer[3]; | |
652 | ||
653 | if (dump && trace_event_get_state_backends(TRACE_GDBSTUB_IO_BINARYREPLY)) { | |
654 | hexdump(buf, len, trace_gdbstub_io_binaryreply); | |
655 | } | |
656 | ||
657 | for(;;) { | |
658 | g_byte_array_set_size(gdbserver_state.last_packet, 0); | |
659 | g_byte_array_append(gdbserver_state.last_packet, | |
660 | (const uint8_t *) "$", 1); | |
661 | g_byte_array_append(gdbserver_state.last_packet, | |
662 | (const uint8_t *) buf, len); | |
663 | csum = 0; | |
664 | for(i = 0; i < len; i++) { | |
665 | csum += buf[i]; | |
666 | } | |
667 | footer[0] = '#'; | |
668 | footer[1] = tohex((csum >> 4) & 0xf); | |
669 | footer[2] = tohex((csum) & 0xf); | |
670 | g_byte_array_append(gdbserver_state.last_packet, footer, 3); | |
671 | ||
672 | put_buffer(gdbserver_state.last_packet->data, | |
673 | gdbserver_state.last_packet->len); | |
674 | ||
675 | #ifdef CONFIG_USER_ONLY | |
676 | i = get_char(); | |
677 | if (i < 0) | |
678 | return -1; | |
679 | if (i == '+') | |
680 | break; | |
681 | #else | |
682 | break; | |
683 | #endif | |
684 | } | |
685 | return 0; | |
686 | } | |
687 | ||
688 | /* return -1 if error, 0 if OK */ | |
689 | static int put_packet(const char *buf) | |
690 | { | |
691 | trace_gdbstub_io_reply(buf); | |
692 | ||
693 | return put_packet_binary(buf, strlen(buf), false); | |
694 | } | |
695 | ||
696 | static void put_strbuf(void) | |
697 | { | |
698 | put_packet(gdbserver_state.str_buf->str); | |
699 | } | |
700 | ||
701 | /* Encode data using the encoding for 'x' packets. */ | |
702 | static void memtox(GString *buf, const char *mem, int len) | |
703 | { | |
704 | char c; | |
705 | ||
706 | while (len--) { | |
707 | c = *(mem++); | |
708 | switch (c) { | |
709 | case '#': case '$': case '*': case '}': | |
710 | g_string_append_c(buf, '}'); | |
711 | g_string_append_c(buf, c ^ 0x20); | |
712 | break; | |
713 | default: | |
714 | g_string_append_c(buf, c); | |
715 | break; | |
716 | } | |
717 | } | |
718 | } | |
719 | ||
720 | static uint32_t gdb_get_cpu_pid(CPUState *cpu) | |
721 | { | |
722 | /* TODO: In user mode, we should use the task state PID */ | |
723 | if (cpu->cluster_index == UNASSIGNED_CLUSTER_INDEX) { | |
724 | /* Return the default process' PID */ | |
725 | int index = gdbserver_state.process_num - 1; | |
726 | return gdbserver_state.processes[index].pid; | |
727 | } | |
728 | return cpu->cluster_index + 1; | |
729 | } | |
730 | ||
731 | static GDBProcess *gdb_get_process(uint32_t pid) | |
732 | { | |
733 | int i; | |
734 | ||
735 | if (!pid) { | |
736 | /* 0 means any process, we take the first one */ | |
737 | return &gdbserver_state.processes[0]; | |
738 | } | |
739 | ||
740 | for (i = 0; i < gdbserver_state.process_num; i++) { | |
741 | if (gdbserver_state.processes[i].pid == pid) { | |
742 | return &gdbserver_state.processes[i]; | |
743 | } | |
744 | } | |
745 | ||
746 | return NULL; | |
747 | } | |
748 | ||
749 | static GDBProcess *gdb_get_cpu_process(CPUState *cpu) | |
750 | { | |
751 | return gdb_get_process(gdb_get_cpu_pid(cpu)); | |
752 | } | |
753 | ||
754 | static CPUState *find_cpu(uint32_t thread_id) | |
755 | { | |
756 | CPUState *cpu; | |
757 | ||
758 | CPU_FOREACH(cpu) { | |
759 | if (cpu_gdb_index(cpu) == thread_id) { | |
760 | return cpu; | |
761 | } | |
762 | } | |
763 | ||
764 | return NULL; | |
765 | } | |
766 | ||
767 | static CPUState *get_first_cpu_in_process(GDBProcess *process) | |
768 | { | |
769 | CPUState *cpu; | |
770 | ||
771 | CPU_FOREACH(cpu) { | |
772 | if (gdb_get_cpu_pid(cpu) == process->pid) { | |
773 | return cpu; | |
774 | } | |
775 | } | |
776 | ||
777 | return NULL; | |
778 | } | |
779 | ||
780 | static CPUState *gdb_next_cpu_in_process(CPUState *cpu) | |
781 | { | |
782 | uint32_t pid = gdb_get_cpu_pid(cpu); | |
783 | cpu = CPU_NEXT(cpu); | |
784 | ||
785 | while (cpu) { | |
786 | if (gdb_get_cpu_pid(cpu) == pid) { | |
787 | break; | |
788 | } | |
789 | ||
790 | cpu = CPU_NEXT(cpu); | |
791 | } | |
792 | ||
793 | return cpu; | |
794 | } | |
795 | ||
796 | /* Return the cpu following @cpu, while ignoring unattached processes. */ | |
797 | static CPUState *gdb_next_attached_cpu(CPUState *cpu) | |
798 | { | |
799 | cpu = CPU_NEXT(cpu); | |
800 | ||
801 | while (cpu) { | |
802 | if (gdb_get_cpu_process(cpu)->attached) { | |
803 | break; | |
804 | } | |
805 | ||
806 | cpu = CPU_NEXT(cpu); | |
807 | } | |
808 | ||
809 | return cpu; | |
810 | } | |
811 | ||
812 | /* Return the first attached cpu */ | |
813 | static CPUState *gdb_first_attached_cpu(void) | |
814 | { | |
815 | CPUState *cpu = first_cpu; | |
816 | GDBProcess *process = gdb_get_cpu_process(cpu); | |
817 | ||
818 | if (!process->attached) { | |
819 | return gdb_next_attached_cpu(cpu); | |
820 | } | |
821 | ||
822 | return cpu; | |
823 | } | |
824 | ||
825 | static CPUState *gdb_get_cpu(uint32_t pid, uint32_t tid) | |
826 | { | |
827 | GDBProcess *process; | |
828 | CPUState *cpu; | |
829 | ||
830 | if (!pid && !tid) { | |
831 | /* 0 means any process/thread, we take the first attached one */ | |
832 | return gdb_first_attached_cpu(); | |
833 | } else if (pid && !tid) { | |
834 | /* any thread in a specific process */ | |
835 | process = gdb_get_process(pid); | |
836 | ||
837 | if (process == NULL) { | |
838 | return NULL; | |
839 | } | |
840 | ||
841 | if (!process->attached) { | |
842 | return NULL; | |
843 | } | |
844 | ||
845 | return get_first_cpu_in_process(process); | |
846 | } else { | |
847 | /* a specific thread */ | |
848 | cpu = find_cpu(tid); | |
849 | ||
850 | if (cpu == NULL) { | |
851 | return NULL; | |
852 | } | |
853 | ||
854 | process = gdb_get_cpu_process(cpu); | |
855 | ||
856 | if (pid && process->pid != pid) { | |
857 | return NULL; | |
858 | } | |
859 | ||
860 | if (!process->attached) { | |
861 | return NULL; | |
862 | } | |
863 | ||
864 | return cpu; | |
865 | } | |
866 | } | |
867 | ||
868 | static const char *get_feature_xml(const char *p, const char **newp, | |
869 | GDBProcess *process) | |
870 | { | |
871 | size_t len; | |
872 | int i; | |
873 | const char *name; | |
874 | CPUState *cpu = get_first_cpu_in_process(process); | |
875 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
876 | ||
877 | len = 0; | |
878 | while (p[len] && p[len] != ':') | |
879 | len++; | |
880 | *newp = p + len; | |
881 | ||
882 | name = NULL; | |
883 | if (strncmp(p, "target.xml", len) == 0) { | |
884 | char *buf = process->target_xml; | |
885 | const size_t buf_sz = sizeof(process->target_xml); | |
886 | ||
887 | /* Generate the XML description for this CPU. */ | |
888 | if (!buf[0]) { | |
889 | GDBRegisterState *r; | |
890 | ||
891 | pstrcat(buf, buf_sz, | |
892 | "<?xml version=\"1.0\"?>" | |
893 | "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">" | |
894 | "<target>"); | |
895 | if (cc->gdb_arch_name) { | |
896 | gchar *arch = cc->gdb_arch_name(cpu); | |
897 | pstrcat(buf, buf_sz, "<architecture>"); | |
898 | pstrcat(buf, buf_sz, arch); | |
899 | pstrcat(buf, buf_sz, "</architecture>"); | |
900 | g_free(arch); | |
901 | } | |
902 | pstrcat(buf, buf_sz, "<xi:include href=\""); | |
903 | pstrcat(buf, buf_sz, cc->gdb_core_xml_file); | |
904 | pstrcat(buf, buf_sz, "\"/>"); | |
905 | for (r = cpu->gdb_regs; r; r = r->next) { | |
906 | pstrcat(buf, buf_sz, "<xi:include href=\""); | |
907 | pstrcat(buf, buf_sz, r->xml); | |
908 | pstrcat(buf, buf_sz, "\"/>"); | |
909 | } | |
910 | pstrcat(buf, buf_sz, "</target>"); | |
911 | } | |
912 | return buf; | |
913 | } | |
914 | if (cc->gdb_get_dynamic_xml) { | |
915 | char *xmlname = g_strndup(p, len); | |
916 | const char *xml = cc->gdb_get_dynamic_xml(cpu, xmlname); | |
917 | ||
918 | g_free(xmlname); | |
919 | if (xml) { | |
920 | return xml; | |
921 | } | |
922 | } | |
923 | for (i = 0; ; i++) { | |
924 | name = xml_builtin[i][0]; | |
925 | if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len)) | |
926 | break; | |
927 | } | |
928 | return name ? xml_builtin[i][1] : NULL; | |
929 | } | |
930 | ||
931 | static int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg) | |
932 | { | |
933 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
934 | CPUArchState *env = cpu->env_ptr; | |
935 | GDBRegisterState *r; | |
936 | ||
937 | if (reg < cc->gdb_num_core_regs) { | |
938 | return cc->gdb_read_register(cpu, buf, reg); | |
939 | } | |
940 | ||
941 | for (r = cpu->gdb_regs; r; r = r->next) { | |
942 | if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { | |
943 | return r->get_reg(env, buf, reg - r->base_reg); | |
944 | } | |
945 | } | |
946 | return 0; | |
947 | } | |
948 | ||
949 | static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) | |
950 | { | |
951 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
952 | CPUArchState *env = cpu->env_ptr; | |
953 | GDBRegisterState *r; | |
954 | ||
955 | if (reg < cc->gdb_num_core_regs) { | |
956 | return cc->gdb_write_register(cpu, mem_buf, reg); | |
957 | } | |
958 | ||
959 | for (r = cpu->gdb_regs; r; r = r->next) { | |
960 | if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { | |
961 | return r->set_reg(env, mem_buf, reg - r->base_reg); | |
962 | } | |
963 | } | |
964 | return 0; | |
965 | } | |
966 | ||
967 | /* Register a supplemental set of CPU registers. If g_pos is nonzero it | |
968 | specifies the first register number and these registers are included in | |
969 | a standard "g" packet. Direction is relative to gdb, i.e. get_reg is | |
970 | gdb reading a CPU register, and set_reg is gdb modifying a CPU register. | |
971 | */ | |
972 | ||
973 | void gdb_register_coprocessor(CPUState *cpu, | |
974 | gdb_get_reg_cb get_reg, gdb_set_reg_cb set_reg, | |
975 | int num_regs, const char *xml, int g_pos) | |
976 | { | |
977 | GDBRegisterState *s; | |
978 | GDBRegisterState **p; | |
979 | ||
980 | p = &cpu->gdb_regs; | |
981 | while (*p) { | |
982 | /* Check for duplicates. */ | |
983 | if (strcmp((*p)->xml, xml) == 0) | |
984 | return; | |
985 | p = &(*p)->next; | |
986 | } | |
987 | ||
988 | s = g_new0(GDBRegisterState, 1); | |
989 | s->base_reg = cpu->gdb_num_regs; | |
990 | s->num_regs = num_regs; | |
991 | s->get_reg = get_reg; | |
992 | s->set_reg = set_reg; | |
993 | s->xml = xml; | |
994 | ||
995 | /* Add to end of list. */ | |
996 | cpu->gdb_num_regs += num_regs; | |
997 | *p = s; | |
998 | if (g_pos) { | |
999 | if (g_pos != s->base_reg) { | |
1000 | error_report("Error: Bad gdb register numbering for '%s', " | |
1001 | "expected %d got %d", xml, g_pos, s->base_reg); | |
1002 | } else { | |
1003 | cpu->gdb_num_g_regs = cpu->gdb_num_regs; | |
1004 | } | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | #ifndef CONFIG_USER_ONLY | |
1009 | /* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */ | |
1010 | static inline int xlat_gdb_type(CPUState *cpu, int gdbtype) | |
1011 | { | |
1012 | static const int xlat[] = { | |
1013 | [GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE, | |
1014 | [GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ, | |
1015 | [GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS, | |
1016 | }; | |
1017 | ||
1018 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
1019 | int cputype = xlat[gdbtype]; | |
1020 | ||
1021 | if (cc->gdb_stop_before_watchpoint) { | |
1022 | cputype |= BP_STOP_BEFORE_ACCESS; | |
1023 | } | |
1024 | return cputype; | |
1025 | } | |
1026 | #endif | |
1027 | ||
1028 | static int gdb_breakpoint_insert(int type, target_ulong addr, target_ulong len) | |
1029 | { | |
1030 | CPUState *cpu; | |
1031 | int err = 0; | |
1032 | ||
1033 | if (kvm_enabled()) { | |
1034 | return kvm_insert_breakpoint(gdbserver_state.c_cpu, addr, len, type); | |
1035 | } | |
1036 | ||
1037 | switch (type) { | |
1038 | case GDB_BREAKPOINT_SW: | |
1039 | case GDB_BREAKPOINT_HW: | |
1040 | CPU_FOREACH(cpu) { | |
1041 | err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL); | |
1042 | if (err) { | |
1043 | break; | |
1044 | } | |
1045 | } | |
1046 | return err; | |
1047 | #ifndef CONFIG_USER_ONLY | |
1048 | case GDB_WATCHPOINT_WRITE: | |
1049 | case GDB_WATCHPOINT_READ: | |
1050 | case GDB_WATCHPOINT_ACCESS: | |
1051 | CPU_FOREACH(cpu) { | |
1052 | err = cpu_watchpoint_insert(cpu, addr, len, | |
1053 | xlat_gdb_type(cpu, type), NULL); | |
1054 | if (err) { | |
1055 | break; | |
1056 | } | |
1057 | } | |
1058 | return err; | |
1059 | #endif | |
1060 | default: | |
1061 | return -ENOSYS; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | static int gdb_breakpoint_remove(int type, target_ulong addr, target_ulong len) | |
1066 | { | |
1067 | CPUState *cpu; | |
1068 | int err = 0; | |
1069 | ||
1070 | if (kvm_enabled()) { | |
1071 | return kvm_remove_breakpoint(gdbserver_state.c_cpu, addr, len, type); | |
1072 | } | |
1073 | ||
1074 | switch (type) { | |
1075 | case GDB_BREAKPOINT_SW: | |
1076 | case GDB_BREAKPOINT_HW: | |
1077 | CPU_FOREACH(cpu) { | |
1078 | err = cpu_breakpoint_remove(cpu, addr, BP_GDB); | |
1079 | if (err) { | |
1080 | break; | |
1081 | } | |
1082 | } | |
1083 | return err; | |
1084 | #ifndef CONFIG_USER_ONLY | |
1085 | case GDB_WATCHPOINT_WRITE: | |
1086 | case GDB_WATCHPOINT_READ: | |
1087 | case GDB_WATCHPOINT_ACCESS: | |
1088 | CPU_FOREACH(cpu) { | |
1089 | err = cpu_watchpoint_remove(cpu, addr, len, | |
1090 | xlat_gdb_type(cpu, type)); | |
1091 | if (err) | |
1092 | break; | |
1093 | } | |
1094 | return err; | |
1095 | #endif | |
1096 | default: | |
1097 | return -ENOSYS; | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | static inline void gdb_cpu_breakpoint_remove_all(CPUState *cpu) | |
1102 | { | |
1103 | cpu_breakpoint_remove_all(cpu, BP_GDB); | |
1104 | #ifndef CONFIG_USER_ONLY | |
1105 | cpu_watchpoint_remove_all(cpu, BP_GDB); | |
1106 | #endif | |
1107 | } | |
1108 | ||
1109 | static void gdb_process_breakpoint_remove_all(GDBProcess *p) | |
1110 | { | |
1111 | CPUState *cpu = get_first_cpu_in_process(p); | |
1112 | ||
1113 | while (cpu) { | |
1114 | gdb_cpu_breakpoint_remove_all(cpu); | |
1115 | cpu = gdb_next_cpu_in_process(cpu); | |
1116 | } | |
1117 | } | |
1118 | ||
1119 | static void gdb_breakpoint_remove_all(void) | |
1120 | { | |
1121 | CPUState *cpu; | |
1122 | ||
1123 | if (kvm_enabled()) { | |
1124 | kvm_remove_all_breakpoints(gdbserver_state.c_cpu); | |
1125 | return; | |
1126 | } | |
1127 | ||
1128 | CPU_FOREACH(cpu) { | |
1129 | gdb_cpu_breakpoint_remove_all(cpu); | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | static void gdb_set_cpu_pc(target_ulong pc) | |
1134 | { | |
1135 | CPUState *cpu = gdbserver_state.c_cpu; | |
1136 | ||
1137 | cpu_synchronize_state(cpu); | |
1138 | cpu_set_pc(cpu, pc); | |
1139 | } | |
1140 | ||
1141 | static void gdb_append_thread_id(CPUState *cpu, GString *buf) | |
1142 | { | |
1143 | if (gdbserver_state.multiprocess) { | |
1144 | g_string_append_printf(buf, "p%02x.%02x", | |
1145 | gdb_get_cpu_pid(cpu), cpu_gdb_index(cpu)); | |
1146 | } else { | |
1147 | g_string_append_printf(buf, "%02x", cpu_gdb_index(cpu)); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | typedef enum GDBThreadIdKind { | |
1152 | GDB_ONE_THREAD = 0, | |
1153 | GDB_ALL_THREADS, /* One process, all threads */ | |
1154 | GDB_ALL_PROCESSES, | |
1155 | GDB_READ_THREAD_ERR | |
1156 | } GDBThreadIdKind; | |
1157 | ||
1158 | static GDBThreadIdKind read_thread_id(const char *buf, const char **end_buf, | |
1159 | uint32_t *pid, uint32_t *tid) | |
1160 | { | |
1161 | unsigned long p, t; | |
1162 | int ret; | |
1163 | ||
1164 | if (*buf == 'p') { | |
1165 | buf++; | |
1166 | ret = qemu_strtoul(buf, &buf, 16, &p); | |
1167 | ||
1168 | if (ret) { | |
1169 | return GDB_READ_THREAD_ERR; | |
1170 | } | |
1171 | ||
1172 | /* Skip '.' */ | |
1173 | buf++; | |
1174 | } else { | |
1175 | p = 1; | |
1176 | } | |
1177 | ||
1178 | ret = qemu_strtoul(buf, &buf, 16, &t); | |
1179 | ||
1180 | if (ret) { | |
1181 | return GDB_READ_THREAD_ERR; | |
1182 | } | |
1183 | ||
1184 | *end_buf = buf; | |
1185 | ||
1186 | if (p == -1) { | |
1187 | return GDB_ALL_PROCESSES; | |
1188 | } | |
1189 | ||
1190 | if (pid) { | |
1191 | *pid = p; | |
1192 | } | |
1193 | ||
1194 | if (t == -1) { | |
1195 | return GDB_ALL_THREADS; | |
1196 | } | |
1197 | ||
1198 | if (tid) { | |
1199 | *tid = t; | |
1200 | } | |
1201 | ||
1202 | return GDB_ONE_THREAD; | |
1203 | } | |
1204 | ||
1205 | /** | |
1206 | * gdb_handle_vcont - Parses and handles a vCont packet. | |
1207 | * returns -ENOTSUP if a command is unsupported, -EINVAL or -ERANGE if there is | |
1208 | * a format error, 0 on success. | |
1209 | */ | |
1210 | static int gdb_handle_vcont(const char *p) | |
1211 | { | |
1212 | int res, signal = 0; | |
1213 | char cur_action; | |
1214 | char *newstates; | |
1215 | unsigned long tmp; | |
1216 | uint32_t pid, tid; | |
1217 | GDBProcess *process; | |
1218 | CPUState *cpu; | |
1219 | GDBThreadIdKind kind; | |
1220 | #ifdef CONFIG_USER_ONLY | |
1221 | int max_cpus = 1; /* global variable max_cpus exists only in system mode */ | |
1222 | ||
1223 | CPU_FOREACH(cpu) { | |
1224 | max_cpus = max_cpus <= cpu->cpu_index ? cpu->cpu_index + 1 : max_cpus; | |
1225 | } | |
1226 | #else | |
1227 | MachineState *ms = MACHINE(qdev_get_machine()); | |
1228 | unsigned int max_cpus = ms->smp.max_cpus; | |
1229 | #endif | |
1230 | /* uninitialised CPUs stay 0 */ | |
1231 | newstates = g_new0(char, max_cpus); | |
1232 | ||
1233 | /* mark valid CPUs with 1 */ | |
1234 | CPU_FOREACH(cpu) { | |
1235 | newstates[cpu->cpu_index] = 1; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * res keeps track of what error we are returning, with -ENOTSUP meaning | |
1240 | * that the command is unknown or unsupported, thus returning an empty | |
1241 | * packet, while -EINVAL and -ERANGE cause an E22 packet, due to invalid, | |
1242 | * or incorrect parameters passed. | |
1243 | */ | |
1244 | res = 0; | |
1245 | while (*p) { | |
1246 | if (*p++ != ';') { | |
1247 | res = -ENOTSUP; | |
1248 | goto out; | |
1249 | } | |
1250 | ||
1251 | cur_action = *p++; | |
1252 | if (cur_action == 'C' || cur_action == 'S') { | |
1253 | cur_action = qemu_tolower(cur_action); | |
1254 | res = qemu_strtoul(p, &p, 16, &tmp); | |
1255 | if (res) { | |
1256 | goto out; | |
1257 | } | |
1258 | signal = gdb_signal_to_target(tmp); | |
1259 | } else if (cur_action != 'c' && cur_action != 's') { | |
1260 | /* unknown/invalid/unsupported command */ | |
1261 | res = -ENOTSUP; | |
1262 | goto out; | |
1263 | } | |
1264 | ||
1265 | if (*p == '\0' || *p == ';') { | |
1266 | /* | |
1267 | * No thread specifier, action is on "all threads". The | |
1268 | * specification is unclear regarding the process to act on. We | |
1269 | * choose all processes. | |
1270 | */ | |
1271 | kind = GDB_ALL_PROCESSES; | |
1272 | } else if (*p++ == ':') { | |
1273 | kind = read_thread_id(p, &p, &pid, &tid); | |
1274 | } else { | |
1275 | res = -ENOTSUP; | |
1276 | goto out; | |
1277 | } | |
1278 | ||
1279 | switch (kind) { | |
1280 | case GDB_READ_THREAD_ERR: | |
1281 | res = -EINVAL; | |
1282 | goto out; | |
1283 | ||
1284 | case GDB_ALL_PROCESSES: | |
1285 | cpu = gdb_first_attached_cpu(); | |
1286 | while (cpu) { | |
1287 | if (newstates[cpu->cpu_index] == 1) { | |
1288 | newstates[cpu->cpu_index] = cur_action; | |
1289 | } | |
1290 | ||
1291 | cpu = gdb_next_attached_cpu(cpu); | |
1292 | } | |
1293 | break; | |
1294 | ||
1295 | case GDB_ALL_THREADS: | |
1296 | process = gdb_get_process(pid); | |
1297 | ||
1298 | if (!process->attached) { | |
1299 | res = -EINVAL; | |
1300 | goto out; | |
1301 | } | |
1302 | ||
1303 | cpu = get_first_cpu_in_process(process); | |
1304 | while (cpu) { | |
1305 | if (newstates[cpu->cpu_index] == 1) { | |
1306 | newstates[cpu->cpu_index] = cur_action; | |
1307 | } | |
1308 | ||
1309 | cpu = gdb_next_cpu_in_process(cpu); | |
1310 | } | |
1311 | break; | |
1312 | ||
1313 | case GDB_ONE_THREAD: | |
1314 | cpu = gdb_get_cpu(pid, tid); | |
1315 | ||
1316 | /* invalid CPU/thread specified */ | |
1317 | if (!cpu) { | |
1318 | res = -EINVAL; | |
1319 | goto out; | |
1320 | } | |
1321 | ||
1322 | /* only use if no previous match occourred */ | |
1323 | if (newstates[cpu->cpu_index] == 1) { | |
1324 | newstates[cpu->cpu_index] = cur_action; | |
1325 | } | |
1326 | break; | |
1327 | } | |
1328 | } | |
1329 | gdbserver_state.signal = signal; | |
1330 | gdb_continue_partial(newstates); | |
1331 | ||
1332 | out: | |
1333 | g_free(newstates); | |
1334 | ||
1335 | return res; | |
1336 | } | |
1337 | ||
1338 | typedef union GdbCmdVariant { | |
1339 | const char *data; | |
1340 | uint8_t opcode; | |
1341 | unsigned long val_ul; | |
1342 | unsigned long long val_ull; | |
1343 | struct { | |
1344 | GDBThreadIdKind kind; | |
1345 | uint32_t pid; | |
1346 | uint32_t tid; | |
1347 | } thread_id; | |
1348 | } GdbCmdVariant; | |
1349 | ||
1350 | #define get_param(p, i) (&g_array_index(p, GdbCmdVariant, i)) | |
1351 | ||
1352 | static const char *cmd_next_param(const char *param, const char delimiter) | |
1353 | { | |
1354 | static const char all_delimiters[] = ",;:="; | |
1355 | char curr_delimiters[2] = {0}; | |
1356 | const char *delimiters; | |
1357 | ||
1358 | if (delimiter == '?') { | |
1359 | delimiters = all_delimiters; | |
1360 | } else if (delimiter == '0') { | |
1361 | return strchr(param, '\0'); | |
1362 | } else if (delimiter == '.' && *param) { | |
1363 | return param + 1; | |
1364 | } else { | |
1365 | curr_delimiters[0] = delimiter; | |
1366 | delimiters = curr_delimiters; | |
1367 | } | |
1368 | ||
1369 | param += strcspn(param, delimiters); | |
1370 | if (*param) { | |
1371 | param++; | |
1372 | } | |
1373 | return param; | |
1374 | } | |
1375 | ||
1376 | static int cmd_parse_params(const char *data, const char *schema, | |
1377 | GArray *params) | |
1378 | { | |
1379 | const char *curr_schema, *curr_data; | |
1380 | ||
1381 | g_assert(schema); | |
1382 | g_assert(params->len == 0); | |
1383 | ||
1384 | curr_schema = schema; | |
1385 | curr_data = data; | |
1386 | while (curr_schema[0] && curr_schema[1] && *curr_data) { | |
1387 | GdbCmdVariant this_param; | |
1388 | ||
1389 | switch (curr_schema[0]) { | |
1390 | case 'l': | |
1391 | if (qemu_strtoul(curr_data, &curr_data, 16, | |
1392 | &this_param.val_ul)) { | |
1393 | return -EINVAL; | |
1394 | } | |
1395 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1396 | g_array_append_val(params, this_param); | |
1397 | break; | |
1398 | case 'L': | |
1399 | if (qemu_strtou64(curr_data, &curr_data, 16, | |
1400 | (uint64_t *)&this_param.val_ull)) { | |
1401 | return -EINVAL; | |
1402 | } | |
1403 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1404 | g_array_append_val(params, this_param); | |
1405 | break; | |
1406 | case 's': | |
1407 | this_param.data = curr_data; | |
1408 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1409 | g_array_append_val(params, this_param); | |
1410 | break; | |
1411 | case 'o': | |
1412 | this_param.opcode = *(uint8_t *)curr_data; | |
1413 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1414 | g_array_append_val(params, this_param); | |
1415 | break; | |
1416 | case 't': | |
1417 | this_param.thread_id.kind = | |
1418 | read_thread_id(curr_data, &curr_data, | |
1419 | &this_param.thread_id.pid, | |
1420 | &this_param.thread_id.tid); | |
1421 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1422 | g_array_append_val(params, this_param); | |
1423 | break; | |
1424 | case '?': | |
1425 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1426 | break; | |
1427 | default: | |
1428 | return -EINVAL; | |
1429 | } | |
1430 | curr_schema += 2; | |
1431 | } | |
1432 | ||
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | typedef void (*GdbCmdHandler)(GArray *params, void *user_ctx); | |
1437 | ||
1438 | /* | |
1439 | * cmd_startswith -> cmd is compared using startswith | |
1440 | * | |
1441 | * | |
1442 | * schema definitions: | |
1443 | * Each schema parameter entry consists of 2 chars, | |
1444 | * the first char represents the parameter type handling | |
1445 | * the second char represents the delimiter for the next parameter | |
1446 | * | |
1447 | * Currently supported schema types: | |
1448 | * 'l' -> unsigned long (stored in .val_ul) | |
1449 | * 'L' -> unsigned long long (stored in .val_ull) | |
1450 | * 's' -> string (stored in .data) | |
1451 | * 'o' -> single char (stored in .opcode) | |
1452 | * 't' -> thread id (stored in .thread_id) | |
1453 | * '?' -> skip according to delimiter | |
1454 | * | |
1455 | * Currently supported delimiters: | |
1456 | * '?' -> Stop at any delimiter (",;:=\0") | |
1457 | * '0' -> Stop at "\0" | |
1458 | * '.' -> Skip 1 char unless reached "\0" | |
1459 | * Any other value is treated as the delimiter value itself | |
1460 | */ | |
1461 | typedef struct GdbCmdParseEntry { | |
1462 | GdbCmdHandler handler; | |
1463 | const char *cmd; | |
1464 | bool cmd_startswith; | |
1465 | const char *schema; | |
1466 | } GdbCmdParseEntry; | |
1467 | ||
1468 | static inline int startswith(const char *string, const char *pattern) | |
1469 | { | |
1470 | return !strncmp(string, pattern, strlen(pattern)); | |
1471 | } | |
1472 | ||
1473 | static int process_string_cmd(void *user_ctx, const char *data, | |
1474 | const GdbCmdParseEntry *cmds, int num_cmds) | |
1475 | { | |
1476 | int i; | |
1477 | g_autoptr(GArray) params = g_array_new(false, true, sizeof(GdbCmdVariant)); | |
1478 | ||
1479 | if (!cmds) { | |
1480 | return -1; | |
1481 | } | |
1482 | ||
1483 | for (i = 0; i < num_cmds; i++) { | |
1484 | const GdbCmdParseEntry *cmd = &cmds[i]; | |
1485 | g_assert(cmd->handler && cmd->cmd); | |
1486 | ||
1487 | if ((cmd->cmd_startswith && !startswith(data, cmd->cmd)) || | |
1488 | (!cmd->cmd_startswith && strcmp(cmd->cmd, data))) { | |
1489 | continue; | |
1490 | } | |
1491 | ||
1492 | if (cmd->schema) { | |
1493 | if (cmd_parse_params(&data[strlen(cmd->cmd)], | |
1494 | cmd->schema, params)) { | |
1495 | return -1; | |
1496 | } | |
1497 | } | |
1498 | ||
1499 | cmd->handler(params, user_ctx); | |
1500 | return 0; | |
1501 | } | |
1502 | ||
1503 | return -1; | |
1504 | } | |
1505 | ||
1506 | static void run_cmd_parser(const char *data, const GdbCmdParseEntry *cmd) | |
1507 | { | |
1508 | if (!data) { | |
1509 | return; | |
1510 | } | |
1511 | ||
1512 | g_string_set_size(gdbserver_state.str_buf, 0); | |
1513 | g_byte_array_set_size(gdbserver_state.mem_buf, 0); | |
1514 | ||
1515 | /* In case there was an error during the command parsing we must | |
1516 | * send a NULL packet to indicate the command is not supported */ | |
1517 | if (process_string_cmd(NULL, data, cmd, 1)) { | |
1518 | put_packet(""); | |
1519 | } | |
1520 | } | |
1521 | ||
1522 | static void handle_detach(GArray *params, void *user_ctx) | |
1523 | { | |
1524 | GDBProcess *process; | |
1525 | uint32_t pid = 1; | |
1526 | ||
1527 | if (gdbserver_state.multiprocess) { | |
1528 | if (!params->len) { | |
1529 | put_packet("E22"); | |
1530 | return; | |
1531 | } | |
1532 | ||
1533 | pid = get_param(params, 0)->val_ul; | |
1534 | } | |
1535 | ||
1536 | process = gdb_get_process(pid); | |
1537 | gdb_process_breakpoint_remove_all(process); | |
1538 | process->attached = false; | |
1539 | ||
1540 | if (pid == gdb_get_cpu_pid(gdbserver_state.c_cpu)) { | |
1541 | gdbserver_state.c_cpu = gdb_first_attached_cpu(); | |
1542 | } | |
1543 | ||
1544 | if (pid == gdb_get_cpu_pid(gdbserver_state.g_cpu)) { | |
1545 | gdbserver_state.g_cpu = gdb_first_attached_cpu(); | |
1546 | } | |
1547 | ||
1548 | if (!gdbserver_state.c_cpu) { | |
1549 | /* No more process attached */ | |
1550 | gdb_syscall_mode = GDB_SYS_DISABLED; | |
1551 | gdb_continue(); | |
1552 | } | |
1553 | put_packet("OK"); | |
1554 | } | |
1555 | ||
1556 | static void handle_thread_alive(GArray *params, void *user_ctx) | |
1557 | { | |
1558 | CPUState *cpu; | |
1559 | ||
1560 | if (!params->len) { | |
1561 | put_packet("E22"); | |
1562 | return; | |
1563 | } | |
1564 | ||
1565 | if (get_param(params, 0)->thread_id.kind == GDB_READ_THREAD_ERR) { | |
1566 | put_packet("E22"); | |
1567 | return; | |
1568 | } | |
1569 | ||
1570 | cpu = gdb_get_cpu(get_param(params, 0)->thread_id.pid, | |
1571 | get_param(params, 0)->thread_id.tid); | |
1572 | if (!cpu) { | |
1573 | put_packet("E22"); | |
1574 | return; | |
1575 | } | |
1576 | ||
1577 | put_packet("OK"); | |
1578 | } | |
1579 | ||
1580 | static void handle_continue(GArray *params, void *user_ctx) | |
1581 | { | |
1582 | if (params->len) { | |
1583 | gdb_set_cpu_pc(get_param(params, 0)->val_ull); | |
1584 | } | |
1585 | ||
1586 | gdbserver_state.signal = 0; | |
1587 | gdb_continue(); | |
1588 | } | |
1589 | ||
1590 | static void handle_cont_with_sig(GArray *params, void *user_ctx) | |
1591 | { | |
1592 | unsigned long signal = 0; | |
1593 | ||
1594 | /* | |
1595 | * Note: C sig;[addr] is currently unsupported and we simply | |
1596 | * omit the addr parameter | |
1597 | */ | |
1598 | if (params->len) { | |
1599 | signal = get_param(params, 0)->val_ul; | |
1600 | } | |
1601 | ||
1602 | gdbserver_state.signal = gdb_signal_to_target(signal); | |
1603 | if (gdbserver_state.signal == -1) { | |
1604 | gdbserver_state.signal = 0; | |
1605 | } | |
1606 | gdb_continue(); | |
1607 | } | |
1608 | ||
1609 | static void handle_set_thread(GArray *params, void *user_ctx) | |
1610 | { | |
1611 | CPUState *cpu; | |
1612 | ||
1613 | if (params->len != 2) { | |
1614 | put_packet("E22"); | |
1615 | return; | |
1616 | } | |
1617 | ||
1618 | if (get_param(params, 1)->thread_id.kind == GDB_READ_THREAD_ERR) { | |
1619 | put_packet("E22"); | |
1620 | return; | |
1621 | } | |
1622 | ||
1623 | if (get_param(params, 1)->thread_id.kind != GDB_ONE_THREAD) { | |
1624 | put_packet("OK"); | |
1625 | return; | |
1626 | } | |
1627 | ||
1628 | cpu = gdb_get_cpu(get_param(params, 1)->thread_id.pid, | |
1629 | get_param(params, 1)->thread_id.tid); | |
1630 | if (!cpu) { | |
1631 | put_packet("E22"); | |
1632 | return; | |
1633 | } | |
1634 | ||
1635 | /* | |
1636 | * Note: This command is deprecated and modern gdb's will be using the | |
1637 | * vCont command instead. | |
1638 | */ | |
1639 | switch (get_param(params, 0)->opcode) { | |
1640 | case 'c': | |
1641 | gdbserver_state.c_cpu = cpu; | |
1642 | put_packet("OK"); | |
1643 | break; | |
1644 | case 'g': | |
1645 | gdbserver_state.g_cpu = cpu; | |
1646 | put_packet("OK"); | |
1647 | break; | |
1648 | default: | |
1649 | put_packet("E22"); | |
1650 | break; | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | static void handle_insert_bp(GArray *params, void *user_ctx) | |
1655 | { | |
1656 | int res; | |
1657 | ||
1658 | if (params->len != 3) { | |
1659 | put_packet("E22"); | |
1660 | return; | |
1661 | } | |
1662 | ||
1663 | res = gdb_breakpoint_insert(get_param(params, 0)->val_ul, | |
1664 | get_param(params, 1)->val_ull, | |
1665 | get_param(params, 2)->val_ull); | |
1666 | if (res >= 0) { | |
1667 | put_packet("OK"); | |
1668 | return; | |
1669 | } else if (res == -ENOSYS) { | |
1670 | put_packet(""); | |
1671 | return; | |
1672 | } | |
1673 | ||
1674 | put_packet("E22"); | |
1675 | } | |
1676 | ||
1677 | static void handle_remove_bp(GArray *params, void *user_ctx) | |
1678 | { | |
1679 | int res; | |
1680 | ||
1681 | if (params->len != 3) { | |
1682 | put_packet("E22"); | |
1683 | return; | |
1684 | } | |
1685 | ||
1686 | res = gdb_breakpoint_remove(get_param(params, 0)->val_ul, | |
1687 | get_param(params, 1)->val_ull, | |
1688 | get_param(params, 2)->val_ull); | |
1689 | if (res >= 0) { | |
1690 | put_packet("OK"); | |
1691 | return; | |
1692 | } else if (res == -ENOSYS) { | |
1693 | put_packet(""); | |
1694 | return; | |
1695 | } | |
1696 | ||
1697 | put_packet("E22"); | |
1698 | } | |
1699 | ||
1700 | /* | |
1701 | * handle_set/get_reg | |
1702 | * | |
1703 | * Older gdb are really dumb, and don't use 'G/g' if 'P/p' is available. | |
1704 | * This works, but can be very slow. Anything new enough to understand | |
1705 | * XML also knows how to use this properly. However to use this we | |
1706 | * need to define a local XML file as well as be talking to a | |
1707 | * reasonably modern gdb. Responding with an empty packet will cause | |
1708 | * the remote gdb to fallback to older methods. | |
1709 | */ | |
1710 | ||
1711 | static void handle_set_reg(GArray *params, void *user_ctx) | |
1712 | { | |
1713 | int reg_size; | |
1714 | ||
1715 | if (!gdb_has_xml) { | |
1716 | put_packet(""); | |
1717 | return; | |
1718 | } | |
1719 | ||
1720 | if (params->len != 2) { | |
1721 | put_packet("E22"); | |
1722 | return; | |
1723 | } | |
1724 | ||
1725 | reg_size = strlen(get_param(params, 1)->data) / 2; | |
1726 | hextomem(gdbserver_state.mem_buf, get_param(params, 1)->data, reg_size); | |
1727 | gdb_write_register(gdbserver_state.g_cpu, gdbserver_state.mem_buf->data, | |
1728 | get_param(params, 0)->val_ull); | |
1729 | put_packet("OK"); | |
1730 | } | |
1731 | ||
1732 | static void handle_get_reg(GArray *params, void *user_ctx) | |
1733 | { | |
1734 | int reg_size; | |
1735 | ||
1736 | if (!gdb_has_xml) { | |
1737 | put_packet(""); | |
1738 | return; | |
1739 | } | |
1740 | ||
1741 | if (!params->len) { | |
1742 | put_packet("E14"); | |
1743 | return; | |
1744 | } | |
1745 | ||
1746 | reg_size = gdb_read_register(gdbserver_state.g_cpu, | |
1747 | gdbserver_state.mem_buf, | |
1748 | get_param(params, 0)->val_ull); | |
1749 | if (!reg_size) { | |
1750 | put_packet("E14"); | |
1751 | return; | |
1752 | } else { | |
1753 | g_byte_array_set_size(gdbserver_state.mem_buf, reg_size); | |
1754 | } | |
1755 | ||
1756 | memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, reg_size); | |
1757 | put_strbuf(); | |
1758 | } | |
1759 | ||
1760 | static void handle_write_mem(GArray *params, void *user_ctx) | |
1761 | { | |
1762 | if (params->len != 3) { | |
1763 | put_packet("E22"); | |
1764 | return; | |
1765 | } | |
1766 | ||
1767 | /* hextomem() reads 2*len bytes */ | |
1768 | if (get_param(params, 1)->val_ull > | |
1769 | strlen(get_param(params, 2)->data) / 2) { | |
1770 | put_packet("E22"); | |
1771 | return; | |
1772 | } | |
1773 | ||
1774 | hextomem(gdbserver_state.mem_buf, get_param(params, 2)->data, | |
1775 | get_param(params, 1)->val_ull); | |
1776 | if (target_memory_rw_debug(gdbserver_state.g_cpu, | |
1777 | get_param(params, 0)->val_ull, | |
1778 | gdbserver_state.mem_buf->data, | |
1779 | gdbserver_state.mem_buf->len, true)) { | |
1780 | put_packet("E14"); | |
1781 | return; | |
1782 | } | |
1783 | ||
1784 | put_packet("OK"); | |
1785 | } | |
1786 | ||
1787 | static void handle_read_mem(GArray *params, void *user_ctx) | |
1788 | { | |
1789 | if (params->len != 2) { | |
1790 | put_packet("E22"); | |
1791 | return; | |
1792 | } | |
1793 | ||
1794 | /* memtohex() doubles the required space */ | |
1795 | if (get_param(params, 1)->val_ull > MAX_PACKET_LENGTH / 2) { | |
1796 | put_packet("E22"); | |
1797 | return; | |
1798 | } | |
1799 | ||
1800 | g_byte_array_set_size(gdbserver_state.mem_buf, | |
1801 | get_param(params, 1)->val_ull); | |
1802 | ||
1803 | if (target_memory_rw_debug(gdbserver_state.g_cpu, | |
1804 | get_param(params, 0)->val_ull, | |
1805 | gdbserver_state.mem_buf->data, | |
1806 | gdbserver_state.mem_buf->len, false)) { | |
1807 | put_packet("E14"); | |
1808 | return; | |
1809 | } | |
1810 | ||
1811 | memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, | |
1812 | gdbserver_state.mem_buf->len); | |
1813 | put_strbuf(); | |
1814 | } | |
1815 | ||
1816 | static void handle_write_all_regs(GArray *params, void *user_ctx) | |
1817 | { | |
1818 | target_ulong addr, len; | |
1819 | uint8_t *registers; | |
1820 | int reg_size; | |
1821 | ||
1822 | if (!params->len) { | |
1823 | return; | |
1824 | } | |
1825 | ||
1826 | cpu_synchronize_state(gdbserver_state.g_cpu); | |
1827 | len = strlen(get_param(params, 0)->data) / 2; | |
1828 | hextomem(gdbserver_state.mem_buf, get_param(params, 0)->data, len); | |
1829 | registers = gdbserver_state.mem_buf->data; | |
1830 | for (addr = 0; addr < gdbserver_state.g_cpu->gdb_num_g_regs && len > 0; | |
1831 | addr++) { | |
1832 | reg_size = gdb_write_register(gdbserver_state.g_cpu, registers, addr); | |
1833 | len -= reg_size; | |
1834 | registers += reg_size; | |
1835 | } | |
1836 | put_packet("OK"); | |
1837 | } | |
1838 | ||
1839 | static void handle_read_all_regs(GArray *params, void *user_ctx) | |
1840 | { | |
1841 | target_ulong addr, len; | |
1842 | ||
1843 | cpu_synchronize_state(gdbserver_state.g_cpu); | |
1844 | g_byte_array_set_size(gdbserver_state.mem_buf, 0); | |
1845 | len = 0; | |
1846 | for (addr = 0; addr < gdbserver_state.g_cpu->gdb_num_g_regs; addr++) { | |
1847 | len += gdb_read_register(gdbserver_state.g_cpu, | |
1848 | gdbserver_state.mem_buf, | |
1849 | addr); | |
1850 | } | |
1851 | g_assert(len == gdbserver_state.mem_buf->len); | |
1852 | ||
1853 | memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, len); | |
1854 | put_strbuf(); | |
1855 | } | |
1856 | ||
1857 | static void handle_file_io(GArray *params, void *user_ctx) | |
1858 | { | |
1859 | if (params->len >= 1 && gdbserver_state.current_syscall_cb) { | |
1860 | target_ulong ret, err; | |
1861 | ||
1862 | ret = (target_ulong)get_param(params, 0)->val_ull; | |
1863 | if (params->len >= 2) { | |
1864 | err = (target_ulong)get_param(params, 1)->val_ull; | |
1865 | } else { | |
1866 | err = 0; | |
1867 | } | |
1868 | gdbserver_state.current_syscall_cb(gdbserver_state.c_cpu, ret, err); | |
1869 | gdbserver_state.current_syscall_cb = NULL; | |
1870 | } | |
1871 | ||
1872 | if (params->len >= 3 && get_param(params, 2)->opcode == (uint8_t)'C') { | |
1873 | put_packet("T02"); | |
1874 | return; | |
1875 | } | |
1876 | ||
1877 | gdb_continue(); | |
1878 | } | |
1879 | ||
1880 | static void handle_step(GArray *params, void *user_ctx) | |
1881 | { | |
1882 | if (params->len) { | |
1883 | gdb_set_cpu_pc((target_ulong)get_param(params, 0)->val_ull); | |
1884 | } | |
1885 | ||
1886 | cpu_single_step(gdbserver_state.c_cpu, get_sstep_flags()); | |
1887 | gdb_continue(); | |
1888 | } | |
1889 | ||
1890 | static void handle_backward(GArray *params, void *user_ctx) | |
1891 | { | |
1892 | if (!stub_can_reverse()) { | |
1893 | put_packet("E22"); | |
1894 | } | |
1895 | if (params->len == 1) { | |
1896 | switch (get_param(params, 0)->opcode) { | |
1897 | case 's': | |
1898 | if (replay_reverse_step()) { | |
1899 | gdb_continue(); | |
1900 | } else { | |
1901 | put_packet("E14"); | |
1902 | } | |
1903 | return; | |
1904 | case 'c': | |
1905 | if (replay_reverse_continue()) { | |
1906 | gdb_continue(); | |
1907 | } else { | |
1908 | put_packet("E14"); | |
1909 | } | |
1910 | return; | |
1911 | } | |
1912 | } | |
1913 | ||
1914 | /* Default invalid command */ | |
1915 | put_packet(""); | |
1916 | } | |
1917 | ||
1918 | static void handle_v_cont_query(GArray *params, void *user_ctx) | |
1919 | { | |
1920 | put_packet("vCont;c;C;s;S"); | |
1921 | } | |
1922 | ||
1923 | static void handle_v_cont(GArray *params, void *user_ctx) | |
1924 | { | |
1925 | int res; | |
1926 | ||
1927 | if (!params->len) { | |
1928 | return; | |
1929 | } | |
1930 | ||
1931 | res = gdb_handle_vcont(get_param(params, 0)->data); | |
1932 | if ((res == -EINVAL) || (res == -ERANGE)) { | |
1933 | put_packet("E22"); | |
1934 | } else if (res) { | |
1935 | put_packet(""); | |
1936 | } | |
1937 | } | |
1938 | ||
1939 | static void handle_v_attach(GArray *params, void *user_ctx) | |
1940 | { | |
1941 | GDBProcess *process; | |
1942 | CPUState *cpu; | |
1943 | ||
1944 | g_string_assign(gdbserver_state.str_buf, "E22"); | |
1945 | if (!params->len) { | |
1946 | goto cleanup; | |
1947 | } | |
1948 | ||
1949 | process = gdb_get_process(get_param(params, 0)->val_ul); | |
1950 | if (!process) { | |
1951 | goto cleanup; | |
1952 | } | |
1953 | ||
1954 | cpu = get_first_cpu_in_process(process); | |
1955 | if (!cpu) { | |
1956 | goto cleanup; | |
1957 | } | |
1958 | ||
1959 | process->attached = true; | |
1960 | gdbserver_state.g_cpu = cpu; | |
1961 | gdbserver_state.c_cpu = cpu; | |
1962 | ||
1963 | g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP); | |
1964 | gdb_append_thread_id(cpu, gdbserver_state.str_buf); | |
1965 | g_string_append_c(gdbserver_state.str_buf, ';'); | |
1966 | cleanup: | |
1967 | put_strbuf(); | |
1968 | } | |
1969 | ||
1970 | static void handle_v_kill(GArray *params, void *user_ctx) | |
1971 | { | |
1972 | /* Kill the target */ | |
1973 | put_packet("OK"); | |
1974 | error_report("QEMU: Terminated via GDBstub"); | |
1975 | gdb_exit(0); | |
1976 | exit(0); | |
1977 | } | |
1978 | ||
1979 | static const GdbCmdParseEntry gdb_v_commands_table[] = { | |
1980 | /* Order is important if has same prefix */ | |
1981 | { | |
1982 | .handler = handle_v_cont_query, | |
1983 | .cmd = "Cont?", | |
1984 | .cmd_startswith = 1 | |
1985 | }, | |
1986 | { | |
1987 | .handler = handle_v_cont, | |
1988 | .cmd = "Cont", | |
1989 | .cmd_startswith = 1, | |
1990 | .schema = "s0" | |
1991 | }, | |
1992 | { | |
1993 | .handler = handle_v_attach, | |
1994 | .cmd = "Attach;", | |
1995 | .cmd_startswith = 1, | |
1996 | .schema = "l0" | |
1997 | }, | |
1998 | { | |
1999 | .handler = handle_v_kill, | |
2000 | .cmd = "Kill;", | |
2001 | .cmd_startswith = 1 | |
2002 | }, | |
2003 | }; | |
2004 | ||
2005 | static void handle_v_commands(GArray *params, void *user_ctx) | |
2006 | { | |
2007 | if (!params->len) { | |
2008 | return; | |
2009 | } | |
2010 | ||
2011 | if (process_string_cmd(NULL, get_param(params, 0)->data, | |
2012 | gdb_v_commands_table, | |
2013 | ARRAY_SIZE(gdb_v_commands_table))) { | |
2014 | put_packet(""); | |
2015 | } | |
2016 | } | |
2017 | ||
2018 | static void handle_query_qemu_sstepbits(GArray *params, void *user_ctx) | |
2019 | { | |
2020 | g_string_printf(gdbserver_state.str_buf, "ENABLE=%x,NOIRQ=%x,NOTIMER=%x", | |
2021 | SSTEP_ENABLE, SSTEP_NOIRQ, SSTEP_NOTIMER); | |
2022 | put_strbuf(); | |
2023 | } | |
2024 | ||
2025 | static void handle_set_qemu_sstep(GArray *params, void *user_ctx) | |
2026 | { | |
2027 | if (!params->len) { | |
2028 | return; | |
2029 | } | |
2030 | ||
2031 | sstep_flags = get_param(params, 0)->val_ul; | |
2032 | put_packet("OK"); | |
2033 | } | |
2034 | ||
2035 | static void handle_query_qemu_sstep(GArray *params, void *user_ctx) | |
2036 | { | |
2037 | g_string_printf(gdbserver_state.str_buf, "0x%x", sstep_flags); | |
2038 | put_strbuf(); | |
2039 | } | |
2040 | ||
2041 | static void handle_query_curr_tid(GArray *params, void *user_ctx) | |
2042 | { | |
2043 | CPUState *cpu; | |
2044 | GDBProcess *process; | |
2045 | ||
2046 | /* | |
2047 | * "Current thread" remains vague in the spec, so always return | |
2048 | * the first thread of the current process (gdb returns the | |
2049 | * first thread). | |
2050 | */ | |
2051 | process = gdb_get_cpu_process(gdbserver_state.g_cpu); | |
2052 | cpu = get_first_cpu_in_process(process); | |
2053 | g_string_assign(gdbserver_state.str_buf, "QC"); | |
2054 | gdb_append_thread_id(cpu, gdbserver_state.str_buf); | |
2055 | put_strbuf(); | |
2056 | } | |
2057 | ||
2058 | static void handle_query_threads(GArray *params, void *user_ctx) | |
2059 | { | |
2060 | if (!gdbserver_state.query_cpu) { | |
2061 | put_packet("l"); | |
2062 | return; | |
2063 | } | |
2064 | ||
2065 | g_string_assign(gdbserver_state.str_buf, "m"); | |
2066 | gdb_append_thread_id(gdbserver_state.query_cpu, gdbserver_state.str_buf); | |
2067 | put_strbuf(); | |
2068 | gdbserver_state.query_cpu = gdb_next_attached_cpu(gdbserver_state.query_cpu); | |
2069 | } | |
2070 | ||
2071 | static void handle_query_first_threads(GArray *params, void *user_ctx) | |
2072 | { | |
2073 | gdbserver_state.query_cpu = gdb_first_attached_cpu(); | |
2074 | handle_query_threads(params, user_ctx); | |
2075 | } | |
2076 | ||
2077 | static void handle_query_thread_extra(GArray *params, void *user_ctx) | |
2078 | { | |
2079 | g_autoptr(GString) rs = g_string_new(NULL); | |
2080 | CPUState *cpu; | |
2081 | ||
2082 | if (!params->len || | |
2083 | get_param(params, 0)->thread_id.kind == GDB_READ_THREAD_ERR) { | |
2084 | put_packet("E22"); | |
2085 | return; | |
2086 | } | |
2087 | ||
2088 | cpu = gdb_get_cpu(get_param(params, 0)->thread_id.pid, | |
2089 | get_param(params, 0)->thread_id.tid); | |
2090 | if (!cpu) { | |
2091 | return; | |
2092 | } | |
2093 | ||
2094 | cpu_synchronize_state(cpu); | |
2095 | ||
2096 | if (gdbserver_state.multiprocess && (gdbserver_state.process_num > 1)) { | |
2097 | /* Print the CPU model and name in multiprocess mode */ | |
2098 | ObjectClass *oc = object_get_class(OBJECT(cpu)); | |
2099 | const char *cpu_model = object_class_get_name(oc); | |
2100 | const char *cpu_name = | |
2101 | object_get_canonical_path_component(OBJECT(cpu)); | |
2102 | g_string_printf(rs, "%s %s [%s]", cpu_model, cpu_name, | |
2103 | cpu->halted ? "halted " : "running"); | |
2104 | } else { | |
2105 | g_string_printf(rs, "CPU#%d [%s]", cpu->cpu_index, | |
2106 | cpu->halted ? "halted " : "running"); | |
2107 | } | |
2108 | trace_gdbstub_op_extra_info(rs->str); | |
2109 | memtohex(gdbserver_state.str_buf, (uint8_t *)rs->str, rs->len); | |
2110 | put_strbuf(); | |
2111 | } | |
2112 | ||
2113 | #ifdef CONFIG_USER_ONLY | |
2114 | static void handle_query_offsets(GArray *params, void *user_ctx) | |
2115 | { | |
2116 | TaskState *ts; | |
2117 | ||
2118 | ts = gdbserver_state.c_cpu->opaque; | |
2119 | g_string_printf(gdbserver_state.str_buf, | |
2120 | "Text=" TARGET_ABI_FMT_lx | |
2121 | ";Data=" TARGET_ABI_FMT_lx | |
2122 | ";Bss=" TARGET_ABI_FMT_lx, | |
2123 | ts->info->code_offset, | |
2124 | ts->info->data_offset, | |
2125 | ts->info->data_offset); | |
2126 | put_strbuf(); | |
2127 | } | |
2128 | #else | |
2129 | static void handle_query_rcmd(GArray *params, void *user_ctx) | |
2130 | { | |
2131 | const guint8 zero = 0; | |
2132 | int len; | |
2133 | ||
2134 | if (!params->len) { | |
2135 | put_packet("E22"); | |
2136 | return; | |
2137 | } | |
2138 | ||
2139 | len = strlen(get_param(params, 0)->data); | |
2140 | if (len % 2) { | |
2141 | put_packet("E01"); | |
2142 | return; | |
2143 | } | |
2144 | ||
2145 | g_assert(gdbserver_state.mem_buf->len == 0); | |
2146 | len = len / 2; | |
2147 | hextomem(gdbserver_state.mem_buf, get_param(params, 0)->data, len); | |
2148 | g_byte_array_append(gdbserver_state.mem_buf, &zero, 1); | |
2149 | qemu_chr_be_write(gdbserver_state.mon_chr, gdbserver_state.mem_buf->data, | |
2150 | gdbserver_state.mem_buf->len); | |
2151 | put_packet("OK"); | |
2152 | } | |
2153 | #endif | |
2154 | ||
2155 | static void handle_query_supported(GArray *params, void *user_ctx) | |
2156 | { | |
2157 | CPUClass *cc; | |
2158 | ||
2159 | g_string_printf(gdbserver_state.str_buf, "PacketSize=%x", MAX_PACKET_LENGTH); | |
2160 | cc = CPU_GET_CLASS(first_cpu); | |
2161 | if (cc->gdb_core_xml_file) { | |
2162 | g_string_append(gdbserver_state.str_buf, ";qXfer:features:read+"); | |
2163 | } | |
2164 | ||
2165 | if (stub_can_reverse()) { | |
2166 | g_string_append(gdbserver_state.str_buf, | |
2167 | ";ReverseStep+;ReverseContinue+"); | |
2168 | } | |
2169 | ||
2170 | #ifdef CONFIG_USER_ONLY | |
2171 | if (gdbserver_state.c_cpu->opaque) { | |
2172 | g_string_append(gdbserver_state.str_buf, ";qXfer:auxv:read+"); | |
2173 | } | |
2174 | #endif | |
2175 | ||
2176 | if (params->len && | |
2177 | strstr(get_param(params, 0)->data, "multiprocess+")) { | |
2178 | gdbserver_state.multiprocess = true; | |
2179 | } | |
2180 | ||
2181 | g_string_append(gdbserver_state.str_buf, ";vContSupported+;multiprocess+"); | |
2182 | put_strbuf(); | |
2183 | } | |
2184 | ||
2185 | static void handle_query_xfer_features(GArray *params, void *user_ctx) | |
2186 | { | |
2187 | GDBProcess *process; | |
2188 | CPUClass *cc; | |
2189 | unsigned long len, total_len, addr; | |
2190 | const char *xml; | |
2191 | const char *p; | |
2192 | ||
2193 | if (params->len < 3) { | |
2194 | put_packet("E22"); | |
2195 | return; | |
2196 | } | |
2197 | ||
2198 | process = gdb_get_cpu_process(gdbserver_state.g_cpu); | |
2199 | cc = CPU_GET_CLASS(gdbserver_state.g_cpu); | |
2200 | if (!cc->gdb_core_xml_file) { | |
2201 | put_packet(""); | |
2202 | return; | |
2203 | } | |
2204 | ||
2205 | gdb_has_xml = true; | |
2206 | p = get_param(params, 0)->data; | |
2207 | xml = get_feature_xml(p, &p, process); | |
2208 | if (!xml) { | |
2209 | put_packet("E00"); | |
2210 | return; | |
2211 | } | |
2212 | ||
2213 | addr = get_param(params, 1)->val_ul; | |
2214 | len = get_param(params, 2)->val_ul; | |
2215 | total_len = strlen(xml); | |
2216 | if (addr > total_len) { | |
2217 | put_packet("E00"); | |
2218 | return; | |
2219 | } | |
2220 | ||
2221 | if (len > (MAX_PACKET_LENGTH - 5) / 2) { | |
2222 | len = (MAX_PACKET_LENGTH - 5) / 2; | |
2223 | } | |
2224 | ||
2225 | if (len < total_len - addr) { | |
2226 | g_string_assign(gdbserver_state.str_buf, "m"); | |
2227 | memtox(gdbserver_state.str_buf, xml + addr, len); | |
2228 | } else { | |
2229 | g_string_assign(gdbserver_state.str_buf, "l"); | |
2230 | memtox(gdbserver_state.str_buf, xml + addr, total_len - addr); | |
2231 | } | |
2232 | ||
2233 | put_packet_binary(gdbserver_state.str_buf->str, | |
2234 | gdbserver_state.str_buf->len, true); | |
2235 | } | |
2236 | ||
2237 | #if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER) | |
2238 | static void handle_query_xfer_auxv(GArray *params, void *user_ctx) | |
2239 | { | |
2240 | TaskState *ts; | |
2241 | unsigned long offset, len, saved_auxv, auxv_len; | |
2242 | ||
2243 | if (params->len < 2) { | |
2244 | put_packet("E22"); | |
2245 | return; | |
2246 | } | |
2247 | ||
2248 | offset = get_param(params, 0)->val_ul; | |
2249 | len = get_param(params, 1)->val_ul; | |
2250 | ts = gdbserver_state.c_cpu->opaque; | |
2251 | saved_auxv = ts->info->saved_auxv; | |
2252 | auxv_len = ts->info->auxv_len; | |
2253 | ||
2254 | if (offset >= auxv_len) { | |
2255 | put_packet("E00"); | |
2256 | return; | |
2257 | } | |
2258 | ||
2259 | if (len > (MAX_PACKET_LENGTH - 5) / 2) { | |
2260 | len = (MAX_PACKET_LENGTH - 5) / 2; | |
2261 | } | |
2262 | ||
2263 | if (len < auxv_len - offset) { | |
2264 | g_string_assign(gdbserver_state.str_buf, "m"); | |
2265 | } else { | |
2266 | g_string_assign(gdbserver_state.str_buf, "l"); | |
2267 | len = auxv_len - offset; | |
2268 | } | |
2269 | ||
2270 | g_byte_array_set_size(gdbserver_state.mem_buf, len); | |
2271 | if (target_memory_rw_debug(gdbserver_state.g_cpu, saved_auxv + offset, | |
2272 | gdbserver_state.mem_buf->data, len, false)) { | |
2273 | put_packet("E14"); | |
2274 | return; | |
2275 | } | |
2276 | ||
2277 | memtox(gdbserver_state.str_buf, | |
2278 | (const char *)gdbserver_state.mem_buf->data, len); | |
2279 | put_packet_binary(gdbserver_state.str_buf->str, | |
2280 | gdbserver_state.str_buf->len, true); | |
2281 | } | |
2282 | #endif | |
2283 | ||
2284 | static void handle_query_attached(GArray *params, void *user_ctx) | |
2285 | { | |
2286 | put_packet(GDB_ATTACHED); | |
2287 | } | |
2288 | ||
2289 | static void handle_query_qemu_supported(GArray *params, void *user_ctx) | |
2290 | { | |
2291 | g_string_printf(gdbserver_state.str_buf, "sstepbits;sstep"); | |
2292 | #ifndef CONFIG_USER_ONLY | |
2293 | g_string_append(gdbserver_state.str_buf, ";PhyMemMode"); | |
2294 | #endif | |
2295 | put_strbuf(); | |
2296 | } | |
2297 | ||
2298 | #ifndef CONFIG_USER_ONLY | |
2299 | static void handle_query_qemu_phy_mem_mode(GArray *params, | |
2300 | void *user_ctx) | |
2301 | { | |
2302 | g_string_printf(gdbserver_state.str_buf, "%d", phy_memory_mode); | |
2303 | put_strbuf(); | |
2304 | } | |
2305 | ||
2306 | static void handle_set_qemu_phy_mem_mode(GArray *params, void *user_ctx) | |
2307 | { | |
2308 | if (!params->len) { | |
2309 | put_packet("E22"); | |
2310 | return; | |
2311 | } | |
2312 | ||
2313 | if (!get_param(params, 0)->val_ul) { | |
2314 | phy_memory_mode = 0; | |
2315 | } else { | |
2316 | phy_memory_mode = 1; | |
2317 | } | |
2318 | put_packet("OK"); | |
2319 | } | |
2320 | #endif | |
2321 | ||
2322 | static const GdbCmdParseEntry gdb_gen_query_set_common_table[] = { | |
2323 | /* Order is important if has same prefix */ | |
2324 | { | |
2325 | .handler = handle_query_qemu_sstepbits, | |
2326 | .cmd = "qemu.sstepbits", | |
2327 | }, | |
2328 | { | |
2329 | .handler = handle_query_qemu_sstep, | |
2330 | .cmd = "qemu.sstep", | |
2331 | }, | |
2332 | { | |
2333 | .handler = handle_set_qemu_sstep, | |
2334 | .cmd = "qemu.sstep=", | |
2335 | .cmd_startswith = 1, | |
2336 | .schema = "l0" | |
2337 | }, | |
2338 | }; | |
2339 | ||
2340 | static const GdbCmdParseEntry gdb_gen_query_table[] = { | |
2341 | { | |
2342 | .handler = handle_query_curr_tid, | |
2343 | .cmd = "C", | |
2344 | }, | |
2345 | { | |
2346 | .handler = handle_query_threads, | |
2347 | .cmd = "sThreadInfo", | |
2348 | }, | |
2349 | { | |
2350 | .handler = handle_query_first_threads, | |
2351 | .cmd = "fThreadInfo", | |
2352 | }, | |
2353 | { | |
2354 | .handler = handle_query_thread_extra, | |
2355 | .cmd = "ThreadExtraInfo,", | |
2356 | .cmd_startswith = 1, | |
2357 | .schema = "t0" | |
2358 | }, | |
2359 | #ifdef CONFIG_USER_ONLY | |
2360 | { | |
2361 | .handler = handle_query_offsets, | |
2362 | .cmd = "Offsets", | |
2363 | }, | |
2364 | #else | |
2365 | { | |
2366 | .handler = handle_query_rcmd, | |
2367 | .cmd = "Rcmd,", | |
2368 | .cmd_startswith = 1, | |
2369 | .schema = "s0" | |
2370 | }, | |
2371 | #endif | |
2372 | { | |
2373 | .handler = handle_query_supported, | |
2374 | .cmd = "Supported:", | |
2375 | .cmd_startswith = 1, | |
2376 | .schema = "s0" | |
2377 | }, | |
2378 | { | |
2379 | .handler = handle_query_supported, | |
2380 | .cmd = "Supported", | |
2381 | .schema = "s0" | |
2382 | }, | |
2383 | { | |
2384 | .handler = handle_query_xfer_features, | |
2385 | .cmd = "Xfer:features:read:", | |
2386 | .cmd_startswith = 1, | |
2387 | .schema = "s:l,l0" | |
2388 | }, | |
2389 | #if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER) | |
2390 | { | |
2391 | .handler = handle_query_xfer_auxv, | |
2392 | .cmd = "Xfer:auxv:read::", | |
2393 | .cmd_startswith = 1, | |
2394 | .schema = "l,l0" | |
2395 | }, | |
2396 | #endif | |
2397 | { | |
2398 | .handler = handle_query_attached, | |
2399 | .cmd = "Attached:", | |
2400 | .cmd_startswith = 1 | |
2401 | }, | |
2402 | { | |
2403 | .handler = handle_query_attached, | |
2404 | .cmd = "Attached", | |
2405 | }, | |
2406 | { | |
2407 | .handler = handle_query_qemu_supported, | |
2408 | .cmd = "qemu.Supported", | |
2409 | }, | |
2410 | #ifndef CONFIG_USER_ONLY | |
2411 | { | |
2412 | .handler = handle_query_qemu_phy_mem_mode, | |
2413 | .cmd = "qemu.PhyMemMode", | |
2414 | }, | |
2415 | #endif | |
2416 | }; | |
2417 | ||
2418 | static const GdbCmdParseEntry gdb_gen_set_table[] = { | |
2419 | /* Order is important if has same prefix */ | |
2420 | { | |
2421 | .handler = handle_set_qemu_sstep, | |
2422 | .cmd = "qemu.sstep:", | |
2423 | .cmd_startswith = 1, | |
2424 | .schema = "l0" | |
2425 | }, | |
2426 | #ifndef CONFIG_USER_ONLY | |
2427 | { | |
2428 | .handler = handle_set_qemu_phy_mem_mode, | |
2429 | .cmd = "qemu.PhyMemMode:", | |
2430 | .cmd_startswith = 1, | |
2431 | .schema = "l0" | |
2432 | }, | |
2433 | #endif | |
2434 | }; | |
2435 | ||
2436 | static void handle_gen_query(GArray *params, void *user_ctx) | |
2437 | { | |
2438 | if (!params->len) { | |
2439 | return; | |
2440 | } | |
2441 | ||
2442 | if (!process_string_cmd(NULL, get_param(params, 0)->data, | |
2443 | gdb_gen_query_set_common_table, | |
2444 | ARRAY_SIZE(gdb_gen_query_set_common_table))) { | |
2445 | return; | |
2446 | } | |
2447 | ||
2448 | if (process_string_cmd(NULL, get_param(params, 0)->data, | |
2449 | gdb_gen_query_table, | |
2450 | ARRAY_SIZE(gdb_gen_query_table))) { | |
2451 | put_packet(""); | |
2452 | } | |
2453 | } | |
2454 | ||
2455 | static void handle_gen_set(GArray *params, void *user_ctx) | |
2456 | { | |
2457 | if (!params->len) { | |
2458 | return; | |
2459 | } | |
2460 | ||
2461 | if (!process_string_cmd(NULL, get_param(params, 0)->data, | |
2462 | gdb_gen_query_set_common_table, | |
2463 | ARRAY_SIZE(gdb_gen_query_set_common_table))) { | |
2464 | return; | |
2465 | } | |
2466 | ||
2467 | if (process_string_cmd(NULL, get_param(params, 0)->data, | |
2468 | gdb_gen_set_table, | |
2469 | ARRAY_SIZE(gdb_gen_set_table))) { | |
2470 | put_packet(""); | |
2471 | } | |
2472 | } | |
2473 | ||
2474 | static void handle_target_halt(GArray *params, void *user_ctx) | |
2475 | { | |
2476 | g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP); | |
2477 | gdb_append_thread_id(gdbserver_state.c_cpu, gdbserver_state.str_buf); | |
2478 | g_string_append_c(gdbserver_state.str_buf, ';'); | |
2479 | put_strbuf(); | |
2480 | /* | |
2481 | * Remove all the breakpoints when this query is issued, | |
2482 | * because gdb is doing an initial connect and the state | |
2483 | * should be cleaned up. | |
2484 | */ | |
2485 | gdb_breakpoint_remove_all(); | |
2486 | } | |
2487 | ||
2488 | static int gdb_handle_packet(const char *line_buf) | |
2489 | { | |
2490 | const GdbCmdParseEntry *cmd_parser = NULL; | |
2491 | ||
2492 | trace_gdbstub_io_command(line_buf); | |
2493 | ||
2494 | switch (line_buf[0]) { | |
2495 | case '!': | |
2496 | put_packet("OK"); | |
2497 | break; | |
2498 | case '?': | |
2499 | { | |
2500 | static const GdbCmdParseEntry target_halted_cmd_desc = { | |
2501 | .handler = handle_target_halt, | |
2502 | .cmd = "?", | |
2503 | .cmd_startswith = 1 | |
2504 | }; | |
2505 | cmd_parser = &target_halted_cmd_desc; | |
2506 | } | |
2507 | break; | |
2508 | case 'c': | |
2509 | { | |
2510 | static const GdbCmdParseEntry continue_cmd_desc = { | |
2511 | .handler = handle_continue, | |
2512 | .cmd = "c", | |
2513 | .cmd_startswith = 1, | |
2514 | .schema = "L0" | |
2515 | }; | |
2516 | cmd_parser = &continue_cmd_desc; | |
2517 | } | |
2518 | break; | |
2519 | case 'C': | |
2520 | { | |
2521 | static const GdbCmdParseEntry cont_with_sig_cmd_desc = { | |
2522 | .handler = handle_cont_with_sig, | |
2523 | .cmd = "C", | |
2524 | .cmd_startswith = 1, | |
2525 | .schema = "l0" | |
2526 | }; | |
2527 | cmd_parser = &cont_with_sig_cmd_desc; | |
2528 | } | |
2529 | break; | |
2530 | case 'v': | |
2531 | { | |
2532 | static const GdbCmdParseEntry v_cmd_desc = { | |
2533 | .handler = handle_v_commands, | |
2534 | .cmd = "v", | |
2535 | .cmd_startswith = 1, | |
2536 | .schema = "s0" | |
2537 | }; | |
2538 | cmd_parser = &v_cmd_desc; | |
2539 | } | |
2540 | break; | |
2541 | case 'k': | |
2542 | /* Kill the target */ | |
2543 | error_report("QEMU: Terminated via GDBstub"); | |
2544 | gdb_exit(0); | |
2545 | exit(0); | |
2546 | case 'D': | |
2547 | { | |
2548 | static const GdbCmdParseEntry detach_cmd_desc = { | |
2549 | .handler = handle_detach, | |
2550 | .cmd = "D", | |
2551 | .cmd_startswith = 1, | |
2552 | .schema = "?.l0" | |
2553 | }; | |
2554 | cmd_parser = &detach_cmd_desc; | |
2555 | } | |
2556 | break; | |
2557 | case 's': | |
2558 | { | |
2559 | static const GdbCmdParseEntry step_cmd_desc = { | |
2560 | .handler = handle_step, | |
2561 | .cmd = "s", | |
2562 | .cmd_startswith = 1, | |
2563 | .schema = "L0" | |
2564 | }; | |
2565 | cmd_parser = &step_cmd_desc; | |
2566 | } | |
2567 | break; | |
2568 | case 'b': | |
2569 | { | |
2570 | static const GdbCmdParseEntry backward_cmd_desc = { | |
2571 | .handler = handle_backward, | |
2572 | .cmd = "b", | |
2573 | .cmd_startswith = 1, | |
2574 | .schema = "o0" | |
2575 | }; | |
2576 | cmd_parser = &backward_cmd_desc; | |
2577 | } | |
2578 | break; | |
2579 | case 'F': | |
2580 | { | |
2581 | static const GdbCmdParseEntry file_io_cmd_desc = { | |
2582 | .handler = handle_file_io, | |
2583 | .cmd = "F", | |
2584 | .cmd_startswith = 1, | |
2585 | .schema = "L,L,o0" | |
2586 | }; | |
2587 | cmd_parser = &file_io_cmd_desc; | |
2588 | } | |
2589 | break; | |
2590 | case 'g': | |
2591 | { | |
2592 | static const GdbCmdParseEntry read_all_regs_cmd_desc = { | |
2593 | .handler = handle_read_all_regs, | |
2594 | .cmd = "g", | |
2595 | .cmd_startswith = 1 | |
2596 | }; | |
2597 | cmd_parser = &read_all_regs_cmd_desc; | |
2598 | } | |
2599 | break; | |
2600 | case 'G': | |
2601 | { | |
2602 | static const GdbCmdParseEntry write_all_regs_cmd_desc = { | |
2603 | .handler = handle_write_all_regs, | |
2604 | .cmd = "G", | |
2605 | .cmd_startswith = 1, | |
2606 | .schema = "s0" | |
2607 | }; | |
2608 | cmd_parser = &write_all_regs_cmd_desc; | |
2609 | } | |
2610 | break; | |
2611 | case 'm': | |
2612 | { | |
2613 | static const GdbCmdParseEntry read_mem_cmd_desc = { | |
2614 | .handler = handle_read_mem, | |
2615 | .cmd = "m", | |
2616 | .cmd_startswith = 1, | |
2617 | .schema = "L,L0" | |
2618 | }; | |
2619 | cmd_parser = &read_mem_cmd_desc; | |
2620 | } | |
2621 | break; | |
2622 | case 'M': | |
2623 | { | |
2624 | static const GdbCmdParseEntry write_mem_cmd_desc = { | |
2625 | .handler = handle_write_mem, | |
2626 | .cmd = "M", | |
2627 | .cmd_startswith = 1, | |
2628 | .schema = "L,L:s0" | |
2629 | }; | |
2630 | cmd_parser = &write_mem_cmd_desc; | |
2631 | } | |
2632 | break; | |
2633 | case 'p': | |
2634 | { | |
2635 | static const GdbCmdParseEntry get_reg_cmd_desc = { | |
2636 | .handler = handle_get_reg, | |
2637 | .cmd = "p", | |
2638 | .cmd_startswith = 1, | |
2639 | .schema = "L0" | |
2640 | }; | |
2641 | cmd_parser = &get_reg_cmd_desc; | |
2642 | } | |
2643 | break; | |
2644 | case 'P': | |
2645 | { | |
2646 | static const GdbCmdParseEntry set_reg_cmd_desc = { | |
2647 | .handler = handle_set_reg, | |
2648 | .cmd = "P", | |
2649 | .cmd_startswith = 1, | |
2650 | .schema = "L?s0" | |
2651 | }; | |
2652 | cmd_parser = &set_reg_cmd_desc; | |
2653 | } | |
2654 | break; | |
2655 | case 'Z': | |
2656 | { | |
2657 | static const GdbCmdParseEntry insert_bp_cmd_desc = { | |
2658 | .handler = handle_insert_bp, | |
2659 | .cmd = "Z", | |
2660 | .cmd_startswith = 1, | |
2661 | .schema = "l?L?L0" | |
2662 | }; | |
2663 | cmd_parser = &insert_bp_cmd_desc; | |
2664 | } | |
2665 | break; | |
2666 | case 'z': | |
2667 | { | |
2668 | static const GdbCmdParseEntry remove_bp_cmd_desc = { | |
2669 | .handler = handle_remove_bp, | |
2670 | .cmd = "z", | |
2671 | .cmd_startswith = 1, | |
2672 | .schema = "l?L?L0" | |
2673 | }; | |
2674 | cmd_parser = &remove_bp_cmd_desc; | |
2675 | } | |
2676 | break; | |
2677 | case 'H': | |
2678 | { | |
2679 | static const GdbCmdParseEntry set_thread_cmd_desc = { | |
2680 | .handler = handle_set_thread, | |
2681 | .cmd = "H", | |
2682 | .cmd_startswith = 1, | |
2683 | .schema = "o.t0" | |
2684 | }; | |
2685 | cmd_parser = &set_thread_cmd_desc; | |
2686 | } | |
2687 | break; | |
2688 | case 'T': | |
2689 | { | |
2690 | static const GdbCmdParseEntry thread_alive_cmd_desc = { | |
2691 | .handler = handle_thread_alive, | |
2692 | .cmd = "T", | |
2693 | .cmd_startswith = 1, | |
2694 | .schema = "t0" | |
2695 | }; | |
2696 | cmd_parser = &thread_alive_cmd_desc; | |
2697 | } | |
2698 | break; | |
2699 | case 'q': | |
2700 | { | |
2701 | static const GdbCmdParseEntry gen_query_cmd_desc = { | |
2702 | .handler = handle_gen_query, | |
2703 | .cmd = "q", | |
2704 | .cmd_startswith = 1, | |
2705 | .schema = "s0" | |
2706 | }; | |
2707 | cmd_parser = &gen_query_cmd_desc; | |
2708 | } | |
2709 | break; | |
2710 | case 'Q': | |
2711 | { | |
2712 | static const GdbCmdParseEntry gen_set_cmd_desc = { | |
2713 | .handler = handle_gen_set, | |
2714 | .cmd = "Q", | |
2715 | .cmd_startswith = 1, | |
2716 | .schema = "s0" | |
2717 | }; | |
2718 | cmd_parser = &gen_set_cmd_desc; | |
2719 | } | |
2720 | break; | |
2721 | default: | |
2722 | /* put empty packet */ | |
2723 | put_packet(""); | |
2724 | break; | |
2725 | } | |
2726 | ||
2727 | if (cmd_parser) { | |
2728 | run_cmd_parser(line_buf, cmd_parser); | |
2729 | } | |
2730 | ||
2731 | return RS_IDLE; | |
2732 | } | |
2733 | ||
2734 | void gdb_set_stop_cpu(CPUState *cpu) | |
2735 | { | |
2736 | GDBProcess *p = gdb_get_cpu_process(cpu); | |
2737 | ||
2738 | if (!p->attached) { | |
2739 | /* | |
2740 | * Having a stop CPU corresponding to a process that is not attached | |
2741 | * confuses GDB. So we ignore the request. | |
2742 | */ | |
2743 | return; | |
2744 | } | |
2745 | ||
2746 | gdbserver_state.c_cpu = cpu; | |
2747 | gdbserver_state.g_cpu = cpu; | |
2748 | } | |
2749 | ||
2750 | #ifndef CONFIG_USER_ONLY | |
2751 | static void gdb_vm_state_change(void *opaque, bool running, RunState state) | |
2752 | { | |
2753 | CPUState *cpu = gdbserver_state.c_cpu; | |
2754 | g_autoptr(GString) buf = g_string_new(NULL); | |
2755 | g_autoptr(GString) tid = g_string_new(NULL); | |
2756 | const char *type; | |
2757 | int ret; | |
2758 | ||
2759 | if (running || gdbserver_state.state == RS_INACTIVE) { | |
2760 | return; | |
2761 | } | |
2762 | /* Is there a GDB syscall waiting to be sent? */ | |
2763 | if (gdbserver_state.current_syscall_cb) { | |
2764 | put_packet(gdbserver_state.syscall_buf); | |
2765 | return; | |
2766 | } | |
2767 | ||
2768 | if (cpu == NULL) { | |
2769 | /* No process attached */ | |
2770 | return; | |
2771 | } | |
2772 | ||
2773 | gdb_append_thread_id(cpu, tid); | |
2774 | ||
2775 | switch (state) { | |
2776 | case RUN_STATE_DEBUG: | |
2777 | if (cpu->watchpoint_hit) { | |
2778 | switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) { | |
2779 | case BP_MEM_READ: | |
2780 | type = "r"; | |
2781 | break; | |
2782 | case BP_MEM_ACCESS: | |
2783 | type = "a"; | |
2784 | break; | |
2785 | default: | |
2786 | type = ""; | |
2787 | break; | |
2788 | } | |
2789 | trace_gdbstub_hit_watchpoint(type, cpu_gdb_index(cpu), | |
2790 | (target_ulong)cpu->watchpoint_hit->vaddr); | |
2791 | g_string_printf(buf, "T%02xthread:%s;%swatch:" TARGET_FMT_lx ";", | |
2792 | GDB_SIGNAL_TRAP, tid->str, type, | |
2793 | (target_ulong)cpu->watchpoint_hit->vaddr); | |
2794 | cpu->watchpoint_hit = NULL; | |
2795 | goto send_packet; | |
2796 | } else { | |
2797 | trace_gdbstub_hit_break(); | |
2798 | } | |
2799 | tb_flush(cpu); | |
2800 | ret = GDB_SIGNAL_TRAP; | |
2801 | break; | |
2802 | case RUN_STATE_PAUSED: | |
2803 | trace_gdbstub_hit_paused(); | |
2804 | ret = GDB_SIGNAL_INT; | |
2805 | break; | |
2806 | case RUN_STATE_SHUTDOWN: | |
2807 | trace_gdbstub_hit_shutdown(); | |
2808 | ret = GDB_SIGNAL_QUIT; | |
2809 | break; | |
2810 | case RUN_STATE_IO_ERROR: | |
2811 | trace_gdbstub_hit_io_error(); | |
2812 | ret = GDB_SIGNAL_IO; | |
2813 | break; | |
2814 | case RUN_STATE_WATCHDOG: | |
2815 | trace_gdbstub_hit_watchdog(); | |
2816 | ret = GDB_SIGNAL_ALRM; | |
2817 | break; | |
2818 | case RUN_STATE_INTERNAL_ERROR: | |
2819 | trace_gdbstub_hit_internal_error(); | |
2820 | ret = GDB_SIGNAL_ABRT; | |
2821 | break; | |
2822 | case RUN_STATE_SAVE_VM: | |
2823 | case RUN_STATE_RESTORE_VM: | |
2824 | return; | |
2825 | case RUN_STATE_FINISH_MIGRATE: | |
2826 | ret = GDB_SIGNAL_XCPU; | |
2827 | break; | |
2828 | default: | |
2829 | trace_gdbstub_hit_unknown(state); | |
2830 | ret = GDB_SIGNAL_UNKNOWN; | |
2831 | break; | |
2832 | } | |
2833 | gdb_set_stop_cpu(cpu); | |
2834 | g_string_printf(buf, "T%02xthread:%s;", ret, tid->str); | |
2835 | ||
2836 | send_packet: | |
2837 | put_packet(buf->str); | |
2838 | ||
2839 | /* disable single step if it was enabled */ | |
2840 | cpu_single_step(cpu, 0); | |
2841 | } | |
2842 | #endif | |
2843 | ||
2844 | /* Send a gdb syscall request. | |
2845 | This accepts limited printf-style format specifiers, specifically: | |
2846 | %x - target_ulong argument printed in hex. | |
2847 | %lx - 64-bit argument printed in hex. | |
2848 | %s - string pointer (target_ulong) and length (int) pair. */ | |
2849 | void gdb_do_syscallv(gdb_syscall_complete_cb cb, const char *fmt, va_list va) | |
2850 | { | |
2851 | char *p; | |
2852 | char *p_end; | |
2853 | target_ulong addr; | |
2854 | uint64_t i64; | |
2855 | ||
2856 | if (!gdbserver_state.init) { | |
2857 | return; | |
2858 | } | |
2859 | ||
2860 | gdbserver_state.current_syscall_cb = cb; | |
2861 | #ifndef CONFIG_USER_ONLY | |
2862 | vm_stop(RUN_STATE_DEBUG); | |
2863 | #endif | |
2864 | p = &gdbserver_state.syscall_buf[0]; | |
2865 | p_end = &gdbserver_state.syscall_buf[sizeof(gdbserver_state.syscall_buf)]; | |
2866 | *(p++) = 'F'; | |
2867 | while (*fmt) { | |
2868 | if (*fmt == '%') { | |
2869 | fmt++; | |
2870 | switch (*fmt++) { | |
2871 | case 'x': | |
2872 | addr = va_arg(va, target_ulong); | |
2873 | p += snprintf(p, p_end - p, TARGET_FMT_lx, addr); | |
2874 | break; | |
2875 | case 'l': | |
2876 | if (*(fmt++) != 'x') | |
2877 | goto bad_format; | |
2878 | i64 = va_arg(va, uint64_t); | |
2879 | p += snprintf(p, p_end - p, "%" PRIx64, i64); | |
2880 | break; | |
2881 | case 's': | |
2882 | addr = va_arg(va, target_ulong); | |
2883 | p += snprintf(p, p_end - p, TARGET_FMT_lx "/%x", | |
2884 | addr, va_arg(va, int)); | |
2885 | break; | |
2886 | default: | |
2887 | bad_format: | |
2888 | error_report("gdbstub: Bad syscall format string '%s'", | |
2889 | fmt - 1); | |
2890 | break; | |
2891 | } | |
2892 | } else { | |
2893 | *(p++) = *(fmt++); | |
2894 | } | |
2895 | } | |
2896 | *p = 0; | |
2897 | #ifdef CONFIG_USER_ONLY | |
2898 | put_packet(gdbserver_state.syscall_buf); | |
2899 | /* Return control to gdb for it to process the syscall request. | |
2900 | * Since the protocol requires that gdb hands control back to us | |
2901 | * using a "here are the results" F packet, we don't need to check | |
2902 | * gdb_handlesig's return value (which is the signal to deliver if | |
2903 | * execution was resumed via a continue packet). | |
2904 | */ | |
2905 | gdb_handlesig(gdbserver_state.c_cpu, 0); | |
2906 | #else | |
2907 | /* In this case wait to send the syscall packet until notification that | |
2908 | the CPU has stopped. This must be done because if the packet is sent | |
2909 | now the reply from the syscall request could be received while the CPU | |
2910 | is still in the running state, which can cause packets to be dropped | |
2911 | and state transition 'T' packets to be sent while the syscall is still | |
2912 | being processed. */ | |
2913 | qemu_cpu_kick(gdbserver_state.c_cpu); | |
2914 | #endif | |
2915 | } | |
2916 | ||
2917 | void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) | |
2918 | { | |
2919 | va_list va; | |
2920 | ||
2921 | va_start(va, fmt); | |
2922 | gdb_do_syscallv(cb, fmt, va); | |
2923 | va_end(va); | |
2924 | } | |
2925 | ||
2926 | static void gdb_read_byte(uint8_t ch) | |
2927 | { | |
2928 | uint8_t reply; | |
2929 | ||
2930 | #ifndef CONFIG_USER_ONLY | |
2931 | if (gdbserver_state.last_packet->len) { | |
2932 | /* Waiting for a response to the last packet. If we see the start | |
2933 | of a new command then abandon the previous response. */ | |
2934 | if (ch == '-') { | |
2935 | trace_gdbstub_err_got_nack(); | |
2936 | put_buffer(gdbserver_state.last_packet->data, | |
2937 | gdbserver_state.last_packet->len); | |
2938 | } else if (ch == '+') { | |
2939 | trace_gdbstub_io_got_ack(); | |
2940 | } else { | |
2941 | trace_gdbstub_io_got_unexpected(ch); | |
2942 | } | |
2943 | ||
2944 | if (ch == '+' || ch == '$') { | |
2945 | g_byte_array_set_size(gdbserver_state.last_packet, 0); | |
2946 | } | |
2947 | if (ch != '$') | |
2948 | return; | |
2949 | } | |
2950 | if (runstate_is_running()) { | |
2951 | /* when the CPU is running, we cannot do anything except stop | |
2952 | it when receiving a char */ | |
2953 | vm_stop(RUN_STATE_PAUSED); | |
2954 | } else | |
2955 | #endif | |
2956 | { | |
2957 | switch(gdbserver_state.state) { | |
2958 | case RS_IDLE: | |
2959 | if (ch == '$') { | |
2960 | /* start of command packet */ | |
2961 | gdbserver_state.line_buf_index = 0; | |
2962 | gdbserver_state.line_sum = 0; | |
2963 | gdbserver_state.state = RS_GETLINE; | |
2964 | } else { | |
2965 | trace_gdbstub_err_garbage(ch); | |
2966 | } | |
2967 | break; | |
2968 | case RS_GETLINE: | |
2969 | if (ch == '}') { | |
2970 | /* start escape sequence */ | |
2971 | gdbserver_state.state = RS_GETLINE_ESC; | |
2972 | gdbserver_state.line_sum += ch; | |
2973 | } else if (ch == '*') { | |
2974 | /* start run length encoding sequence */ | |
2975 | gdbserver_state.state = RS_GETLINE_RLE; | |
2976 | gdbserver_state.line_sum += ch; | |
2977 | } else if (ch == '#') { | |
2978 | /* end of command, start of checksum*/ | |
2979 | gdbserver_state.state = RS_CHKSUM1; | |
2980 | } else if (gdbserver_state.line_buf_index >= sizeof(gdbserver_state.line_buf) - 1) { | |
2981 | trace_gdbstub_err_overrun(); | |
2982 | gdbserver_state.state = RS_IDLE; | |
2983 | } else { | |
2984 | /* unescaped command character */ | |
2985 | gdbserver_state.line_buf[gdbserver_state.line_buf_index++] = ch; | |
2986 | gdbserver_state.line_sum += ch; | |
2987 | } | |
2988 | break; | |
2989 | case RS_GETLINE_ESC: | |
2990 | if (ch == '#') { | |
2991 | /* unexpected end of command in escape sequence */ | |
2992 | gdbserver_state.state = RS_CHKSUM1; | |
2993 | } else if (gdbserver_state.line_buf_index >= sizeof(gdbserver_state.line_buf) - 1) { | |
2994 | /* command buffer overrun */ | |
2995 | trace_gdbstub_err_overrun(); | |
2996 | gdbserver_state.state = RS_IDLE; | |
2997 | } else { | |
2998 | /* parse escaped character and leave escape state */ | |
2999 | gdbserver_state.line_buf[gdbserver_state.line_buf_index++] = ch ^ 0x20; | |
3000 | gdbserver_state.line_sum += ch; | |
3001 | gdbserver_state.state = RS_GETLINE; | |
3002 | } | |
3003 | break; | |
3004 | case RS_GETLINE_RLE: | |
3005 | /* | |
3006 | * Run-length encoding is explained in "Debugging with GDB / | |
3007 | * Appendix E GDB Remote Serial Protocol / Overview". | |
3008 | */ | |
3009 | if (ch < ' ' || ch == '#' || ch == '$' || ch > 126) { | |
3010 | /* invalid RLE count encoding */ | |
3011 | trace_gdbstub_err_invalid_repeat(ch); | |
3012 | gdbserver_state.state = RS_GETLINE; | |
3013 | } else { | |
3014 | /* decode repeat length */ | |
3015 | int repeat = ch - ' ' + 3; | |
3016 | if (gdbserver_state.line_buf_index + repeat >= sizeof(gdbserver_state.line_buf) - 1) { | |
3017 | /* that many repeats would overrun the command buffer */ | |
3018 | trace_gdbstub_err_overrun(); | |
3019 | gdbserver_state.state = RS_IDLE; | |
3020 | } else if (gdbserver_state.line_buf_index < 1) { | |
3021 | /* got a repeat but we have nothing to repeat */ | |
3022 | trace_gdbstub_err_invalid_rle(); | |
3023 | gdbserver_state.state = RS_GETLINE; | |
3024 | } else { | |
3025 | /* repeat the last character */ | |
3026 | memset(gdbserver_state.line_buf + gdbserver_state.line_buf_index, | |
3027 | gdbserver_state.line_buf[gdbserver_state.line_buf_index - 1], repeat); | |
3028 | gdbserver_state.line_buf_index += repeat; | |
3029 | gdbserver_state.line_sum += ch; | |
3030 | gdbserver_state.state = RS_GETLINE; | |
3031 | } | |
3032 | } | |
3033 | break; | |
3034 | case RS_CHKSUM1: | |
3035 | /* get high hex digit of checksum */ | |
3036 | if (!isxdigit(ch)) { | |
3037 | trace_gdbstub_err_checksum_invalid(ch); | |
3038 | gdbserver_state.state = RS_GETLINE; | |
3039 | break; | |
3040 | } | |
3041 | gdbserver_state.line_buf[gdbserver_state.line_buf_index] = '\0'; | |
3042 | gdbserver_state.line_csum = fromhex(ch) << 4; | |
3043 | gdbserver_state.state = RS_CHKSUM2; | |
3044 | break; | |
3045 | case RS_CHKSUM2: | |
3046 | /* get low hex digit of checksum */ | |
3047 | if (!isxdigit(ch)) { | |
3048 | trace_gdbstub_err_checksum_invalid(ch); | |
3049 | gdbserver_state.state = RS_GETLINE; | |
3050 | break; | |
3051 | } | |
3052 | gdbserver_state.line_csum |= fromhex(ch); | |
3053 | ||
3054 | if (gdbserver_state.line_csum != (gdbserver_state.line_sum & 0xff)) { | |
3055 | trace_gdbstub_err_checksum_incorrect(gdbserver_state.line_sum, gdbserver_state.line_csum); | |
3056 | /* send NAK reply */ | |
3057 | reply = '-'; | |
3058 | put_buffer(&reply, 1); | |
3059 | gdbserver_state.state = RS_IDLE; | |
3060 | } else { | |
3061 | /* send ACK reply */ | |
3062 | reply = '+'; | |
3063 | put_buffer(&reply, 1); | |
3064 | gdbserver_state.state = gdb_handle_packet(gdbserver_state.line_buf); | |
3065 | } | |
3066 | break; | |
3067 | default: | |
3068 | abort(); | |
3069 | } | |
3070 | } | |
3071 | } | |
3072 | ||
3073 | /* Tell the remote gdb that the process has exited. */ | |
3074 | void gdb_exit(int code) | |
3075 | { | |
3076 | char buf[4]; | |
3077 | ||
3078 | if (!gdbserver_state.init) { | |
3079 | return; | |
3080 | } | |
3081 | #ifdef CONFIG_USER_ONLY | |
3082 | if (gdbserver_state.socket_path) { | |
3083 | unlink(gdbserver_state.socket_path); | |
3084 | } | |
3085 | if (gdbserver_state.fd < 0) { | |
3086 | return; | |
3087 | } | |
3088 | #endif | |
3089 | ||
3090 | trace_gdbstub_op_exiting((uint8_t)code); | |
3091 | ||
3092 | snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code); | |
3093 | put_packet(buf); | |
3094 | ||
3095 | #ifndef CONFIG_USER_ONLY | |
3096 | qemu_chr_fe_deinit(&gdbserver_state.chr, true); | |
3097 | #endif | |
3098 | } | |
3099 | ||
3100 | /* | |
3101 | * Create the process that will contain all the "orphan" CPUs (that are not | |
3102 | * part of a CPU cluster). Note that if this process contains no CPUs, it won't | |
3103 | * be attachable and thus will be invisible to the user. | |
3104 | */ | |
3105 | static void create_default_process(GDBState *s) | |
3106 | { | |
3107 | GDBProcess *process; | |
3108 | int max_pid = 0; | |
3109 | ||
3110 | if (gdbserver_state.process_num) { | |
3111 | max_pid = s->processes[s->process_num - 1].pid; | |
3112 | } | |
3113 | ||
3114 | s->processes = g_renew(GDBProcess, s->processes, ++s->process_num); | |
3115 | process = &s->processes[s->process_num - 1]; | |
3116 | ||
3117 | /* We need an available PID slot for this process */ | |
3118 | assert(max_pid < UINT32_MAX); | |
3119 | ||
3120 | process->pid = max_pid + 1; | |
3121 | process->attached = false; | |
3122 | process->target_xml[0] = '\0'; | |
3123 | } | |
3124 | ||
3125 | #ifdef CONFIG_USER_ONLY | |
3126 | int | |
3127 | gdb_handlesig(CPUState *cpu, int sig) | |
3128 | { | |
3129 | char buf[256]; | |
3130 | int n; | |
3131 | ||
3132 | if (!gdbserver_state.init || gdbserver_state.fd < 0) { | |
3133 | return sig; | |
3134 | } | |
3135 | ||
3136 | /* disable single step if it was enabled */ | |
3137 | cpu_single_step(cpu, 0); | |
3138 | tb_flush(cpu); | |
3139 | ||
3140 | if (sig != 0) { | |
3141 | gdb_set_stop_cpu(cpu); | |
3142 | g_string_printf(gdbserver_state.str_buf, | |
3143 | "T%02xthread:", target_signal_to_gdb(sig)); | |
3144 | gdb_append_thread_id(cpu, gdbserver_state.str_buf); | |
3145 | g_string_append_c(gdbserver_state.str_buf, ';'); | |
3146 | put_strbuf(); | |
3147 | } | |
3148 | /* put_packet() might have detected that the peer terminated the | |
3149 | connection. */ | |
3150 | if (gdbserver_state.fd < 0) { | |
3151 | return sig; | |
3152 | } | |
3153 | ||
3154 | sig = 0; | |
3155 | gdbserver_state.state = RS_IDLE; | |
3156 | gdbserver_state.running_state = 0; | |
3157 | while (gdbserver_state.running_state == 0) { | |
3158 | n = read(gdbserver_state.fd, buf, 256); | |
3159 | if (n > 0) { | |
3160 | int i; | |
3161 | ||
3162 | for (i = 0; i < n; i++) { | |
3163 | gdb_read_byte(buf[i]); | |
3164 | } | |
3165 | } else { | |
3166 | /* XXX: Connection closed. Should probably wait for another | |
3167 | connection before continuing. */ | |
3168 | if (n == 0) { | |
3169 | close(gdbserver_state.fd); | |
3170 | } | |
3171 | gdbserver_state.fd = -1; | |
3172 | return sig; | |
3173 | } | |
3174 | } | |
3175 | sig = gdbserver_state.signal; | |
3176 | gdbserver_state.signal = 0; | |
3177 | return sig; | |
3178 | } | |
3179 | ||
3180 | /* Tell the remote gdb that the process has exited due to SIG. */ | |
3181 | void gdb_signalled(CPUArchState *env, int sig) | |
3182 | { | |
3183 | char buf[4]; | |
3184 | ||
3185 | if (!gdbserver_state.init || gdbserver_state.fd < 0) { | |
3186 | return; | |
3187 | } | |
3188 | ||
3189 | snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb(sig)); | |
3190 | put_packet(buf); | |
3191 | } | |
3192 | ||
3193 | static void gdb_accept_init(int fd) | |
3194 | { | |
3195 | init_gdbserver_state(); | |
3196 | create_default_process(&gdbserver_state); | |
3197 | gdbserver_state.processes[0].attached = true; | |
3198 | gdbserver_state.c_cpu = gdb_first_attached_cpu(); | |
3199 | gdbserver_state.g_cpu = gdbserver_state.c_cpu; | |
3200 | gdbserver_state.fd = fd; | |
3201 | gdb_has_xml = false; | |
3202 | } | |
3203 | ||
3204 | static bool gdb_accept_socket(int gdb_fd) | |
3205 | { | |
3206 | int fd; | |
3207 | ||
3208 | for(;;) { | |
3209 | fd = accept(gdb_fd, NULL, NULL); | |
3210 | if (fd < 0 && errno != EINTR) { | |
3211 | perror("accept socket"); | |
3212 | return false; | |
3213 | } else if (fd >= 0) { | |
3214 | qemu_set_cloexec(fd); | |
3215 | break; | |
3216 | } | |
3217 | } | |
3218 | ||
3219 | gdb_accept_init(fd); | |
3220 | return true; | |
3221 | } | |
3222 | ||
3223 | static int gdbserver_open_socket(const char *path) | |
3224 | { | |
3225 | struct sockaddr_un sockaddr = {}; | |
3226 | int fd, ret; | |
3227 | ||
3228 | fd = socket(AF_UNIX, SOCK_STREAM, 0); | |
3229 | if (fd < 0) { | |
3230 | perror("create socket"); | |
3231 | return -1; | |
3232 | } | |
3233 | ||
3234 | sockaddr.sun_family = AF_UNIX; | |
3235 | pstrcpy(sockaddr.sun_path, sizeof(sockaddr.sun_path) - 1, path); | |
3236 | ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); | |
3237 | if (ret < 0) { | |
3238 | perror("bind socket"); | |
3239 | close(fd); | |
3240 | return -1; | |
3241 | } | |
3242 | ret = listen(fd, 1); | |
3243 | if (ret < 0) { | |
3244 | perror("listen socket"); | |
3245 | close(fd); | |
3246 | return -1; | |
3247 | } | |
3248 | ||
3249 | return fd; | |
3250 | } | |
3251 | ||
3252 | static bool gdb_accept_tcp(int gdb_fd) | |
3253 | { | |
3254 | struct sockaddr_in sockaddr = {}; | |
3255 | socklen_t len; | |
3256 | int fd; | |
3257 | ||
3258 | for(;;) { | |
3259 | len = sizeof(sockaddr); | |
3260 | fd = accept(gdb_fd, (struct sockaddr *)&sockaddr, &len); | |
3261 | if (fd < 0 && errno != EINTR) { | |
3262 | perror("accept"); | |
3263 | return false; | |
3264 | } else if (fd >= 0) { | |
3265 | qemu_set_cloexec(fd); | |
3266 | break; | |
3267 | } | |
3268 | } | |
3269 | ||
3270 | /* set short latency */ | |
3271 | if (socket_set_nodelay(fd)) { | |
3272 | perror("setsockopt"); | |
3273 | close(fd); | |
3274 | return false; | |
3275 | } | |
3276 | ||
3277 | gdb_accept_init(fd); | |
3278 | return true; | |
3279 | } | |
3280 | ||
3281 | static int gdbserver_open_port(int port) | |
3282 | { | |
3283 | struct sockaddr_in sockaddr; | |
3284 | int fd, ret; | |
3285 | ||
3286 | fd = socket(PF_INET, SOCK_STREAM, 0); | |
3287 | if (fd < 0) { | |
3288 | perror("socket"); | |
3289 | return -1; | |
3290 | } | |
3291 | qemu_set_cloexec(fd); | |
3292 | ||
3293 | socket_set_fast_reuse(fd); | |
3294 | ||
3295 | sockaddr.sin_family = AF_INET; | |
3296 | sockaddr.sin_port = htons(port); | |
3297 | sockaddr.sin_addr.s_addr = 0; | |
3298 | ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); | |
3299 | if (ret < 0) { | |
3300 | perror("bind"); | |
3301 | close(fd); | |
3302 | return -1; | |
3303 | } | |
3304 | ret = listen(fd, 1); | |
3305 | if (ret < 0) { | |
3306 | perror("listen"); | |
3307 | close(fd); | |
3308 | return -1; | |
3309 | } | |
3310 | ||
3311 | return fd; | |
3312 | } | |
3313 | ||
3314 | int gdbserver_start(const char *port_or_path) | |
3315 | { | |
3316 | int port = g_ascii_strtoull(port_or_path, NULL, 10); | |
3317 | int gdb_fd; | |
3318 | ||
3319 | if (port > 0) { | |
3320 | gdb_fd = gdbserver_open_port(port); | |
3321 | } else { | |
3322 | gdb_fd = gdbserver_open_socket(port_or_path); | |
3323 | } | |
3324 | ||
3325 | if (gdb_fd < 0) { | |
3326 | return -1; | |
3327 | } | |
3328 | ||
3329 | if (port > 0 && gdb_accept_tcp(gdb_fd)) { | |
3330 | return 0; | |
3331 | } else if (gdb_accept_socket(gdb_fd)) { | |
3332 | gdbserver_state.socket_path = g_strdup(port_or_path); | |
3333 | return 0; | |
3334 | } | |
3335 | ||
3336 | /* gone wrong */ | |
3337 | close(gdb_fd); | |
3338 | return -1; | |
3339 | } | |
3340 | ||
3341 | /* Disable gdb stub for child processes. */ | |
3342 | void gdbserver_fork(CPUState *cpu) | |
3343 | { | |
3344 | if (!gdbserver_state.init || gdbserver_state.fd < 0) { | |
3345 | return; | |
3346 | } | |
3347 | close(gdbserver_state.fd); | |
3348 | gdbserver_state.fd = -1; | |
3349 | cpu_breakpoint_remove_all(cpu, BP_GDB); | |
3350 | cpu_watchpoint_remove_all(cpu, BP_GDB); | |
3351 | } | |
3352 | #else | |
3353 | static int gdb_chr_can_receive(void *opaque) | |
3354 | { | |
3355 | /* We can handle an arbitrarily large amount of data. | |
3356 | Pick the maximum packet size, which is as good as anything. */ | |
3357 | return MAX_PACKET_LENGTH; | |
3358 | } | |
3359 | ||
3360 | static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size) | |
3361 | { | |
3362 | int i; | |
3363 | ||
3364 | for (i = 0; i < size; i++) { | |
3365 | gdb_read_byte(buf[i]); | |
3366 | } | |
3367 | } | |
3368 | ||
3369 | static void gdb_chr_event(void *opaque, QEMUChrEvent event) | |
3370 | { | |
3371 | int i; | |
3372 | GDBState *s = (GDBState *) opaque; | |
3373 | ||
3374 | switch (event) { | |
3375 | case CHR_EVENT_OPENED: | |
3376 | /* Start with first process attached, others detached */ | |
3377 | for (i = 0; i < s->process_num; i++) { | |
3378 | s->processes[i].attached = !i; | |
3379 | } | |
3380 | ||
3381 | s->c_cpu = gdb_first_attached_cpu(); | |
3382 | s->g_cpu = s->c_cpu; | |
3383 | ||
3384 | vm_stop(RUN_STATE_PAUSED); | |
3385 | replay_gdb_attached(); | |
3386 | gdb_has_xml = false; | |
3387 | break; | |
3388 | default: | |
3389 | break; | |
3390 | } | |
3391 | } | |
3392 | ||
3393 | static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len) | |
3394 | { | |
3395 | g_autoptr(GString) hex_buf = g_string_new("O"); | |
3396 | memtohex(hex_buf, buf, len); | |
3397 | put_packet(hex_buf->str); | |
3398 | return len; | |
3399 | } | |
3400 | ||
3401 | #ifndef _WIN32 | |
3402 | static void gdb_sigterm_handler(int signal) | |
3403 | { | |
3404 | if (runstate_is_running()) { | |
3405 | vm_stop(RUN_STATE_PAUSED); | |
3406 | } | |
3407 | } | |
3408 | #endif | |
3409 | ||
3410 | static void gdb_monitor_open(Chardev *chr, ChardevBackend *backend, | |
3411 | bool *be_opened, Error **errp) | |
3412 | { | |
3413 | *be_opened = false; | |
3414 | } | |
3415 | ||
3416 | static void char_gdb_class_init(ObjectClass *oc, void *data) | |
3417 | { | |
3418 | ChardevClass *cc = CHARDEV_CLASS(oc); | |
3419 | ||
3420 | cc->internal = true; | |
3421 | cc->open = gdb_monitor_open; | |
3422 | cc->chr_write = gdb_monitor_write; | |
3423 | } | |
3424 | ||
3425 | #define TYPE_CHARDEV_GDB "chardev-gdb" | |
3426 | ||
3427 | static const TypeInfo char_gdb_type_info = { | |
3428 | .name = TYPE_CHARDEV_GDB, | |
3429 | .parent = TYPE_CHARDEV, | |
3430 | .class_init = char_gdb_class_init, | |
3431 | }; | |
3432 | ||
3433 | static int find_cpu_clusters(Object *child, void *opaque) | |
3434 | { | |
3435 | if (object_dynamic_cast(child, TYPE_CPU_CLUSTER)) { | |
3436 | GDBState *s = (GDBState *) opaque; | |
3437 | CPUClusterState *cluster = CPU_CLUSTER(child); | |
3438 | GDBProcess *process; | |
3439 | ||
3440 | s->processes = g_renew(GDBProcess, s->processes, ++s->process_num); | |
3441 | ||
3442 | process = &s->processes[s->process_num - 1]; | |
3443 | ||
3444 | /* | |
3445 | * GDB process IDs -1 and 0 are reserved. To avoid subtle errors at | |
3446 | * runtime, we enforce here that the machine does not use a cluster ID | |
3447 | * that would lead to PID 0. | |
3448 | */ | |
3449 | assert(cluster->cluster_id != UINT32_MAX); | |
3450 | process->pid = cluster->cluster_id + 1; | |
3451 | process->attached = false; | |
3452 | process->target_xml[0] = '\0'; | |
3453 | ||
3454 | return 0; | |
3455 | } | |
3456 | ||
3457 | return object_child_foreach(child, find_cpu_clusters, opaque); | |
3458 | } | |
3459 | ||
3460 | static int pid_order(const void *a, const void *b) | |
3461 | { | |
3462 | GDBProcess *pa = (GDBProcess *) a; | |
3463 | GDBProcess *pb = (GDBProcess *) b; | |
3464 | ||
3465 | if (pa->pid < pb->pid) { | |
3466 | return -1; | |
3467 | } else if (pa->pid > pb->pid) { | |
3468 | return 1; | |
3469 | } else { | |
3470 | return 0; | |
3471 | } | |
3472 | } | |
3473 | ||
3474 | static void create_processes(GDBState *s) | |
3475 | { | |
3476 | object_child_foreach(object_get_root(), find_cpu_clusters, s); | |
3477 | ||
3478 | if (gdbserver_state.processes) { | |
3479 | /* Sort by PID */ | |
3480 | qsort(gdbserver_state.processes, gdbserver_state.process_num, sizeof(gdbserver_state.processes[0]), pid_order); | |
3481 | } | |
3482 | ||
3483 | create_default_process(s); | |
3484 | } | |
3485 | ||
3486 | int gdbserver_start(const char *device) | |
3487 | { | |
3488 | trace_gdbstub_op_start(device); | |
3489 | ||
3490 | char gdbstub_device_name[128]; | |
3491 | Chardev *chr = NULL; | |
3492 | Chardev *mon_chr; | |
3493 | ||
3494 | if (!first_cpu) { | |
3495 | error_report("gdbstub: meaningless to attach gdb to a " | |
3496 | "machine without any CPU."); | |
3497 | return -1; | |
3498 | } | |
3499 | ||
3500 | if (!device) | |
3501 | return -1; | |
3502 | if (strcmp(device, "none") != 0) { | |
3503 | if (strstart(device, "tcp:", NULL)) { | |
3504 | /* enforce required TCP attributes */ | |
3505 | snprintf(gdbstub_device_name, sizeof(gdbstub_device_name), | |
3506 | "%s,wait=off,nodelay=on,server=on", device); | |
3507 | device = gdbstub_device_name; | |
3508 | } | |
3509 | #ifndef _WIN32 | |
3510 | else if (strcmp(device, "stdio") == 0) { | |
3511 | struct sigaction act; | |
3512 | ||
3513 | memset(&act, 0, sizeof(act)); | |
3514 | act.sa_handler = gdb_sigterm_handler; | |
3515 | sigaction(SIGINT, &act, NULL); | |
3516 | } | |
3517 | #endif | |
3518 | /* | |
3519 | * FIXME: it's a bit weird to allow using a mux chardev here | |
3520 | * and implicitly setup a monitor. We may want to break this. | |
3521 | */ | |
3522 | chr = qemu_chr_new_noreplay("gdb", device, true, NULL); | |
3523 | if (!chr) | |
3524 | return -1; | |
3525 | } | |
3526 | ||
3527 | if (!gdbserver_state.init) { | |
3528 | init_gdbserver_state(); | |
3529 | ||
3530 | qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL); | |
3531 | ||
3532 | /* Initialize a monitor terminal for gdb */ | |
3533 | mon_chr = qemu_chardev_new(NULL, TYPE_CHARDEV_GDB, | |
3534 | NULL, NULL, &error_abort); | |
3535 | monitor_init_hmp(mon_chr, false, &error_abort); | |
3536 | } else { | |
3537 | qemu_chr_fe_deinit(&gdbserver_state.chr, true); | |
3538 | mon_chr = gdbserver_state.mon_chr; | |
3539 | reset_gdbserver_state(); | |
3540 | } | |
3541 | ||
3542 | create_processes(&gdbserver_state); | |
3543 | ||
3544 | if (chr) { | |
3545 | qemu_chr_fe_init(&gdbserver_state.chr, chr, &error_abort); | |
3546 | qemu_chr_fe_set_handlers(&gdbserver_state.chr, gdb_chr_can_receive, | |
3547 | gdb_chr_receive, gdb_chr_event, | |
3548 | NULL, &gdbserver_state, NULL, true); | |
3549 | } | |
3550 | gdbserver_state.state = chr ? RS_IDLE : RS_INACTIVE; | |
3551 | gdbserver_state.mon_chr = mon_chr; | |
3552 | gdbserver_state.current_syscall_cb = NULL; | |
3553 | ||
3554 | return 0; | |
3555 | } | |
3556 | ||
3557 | static void register_types(void) | |
3558 | { | |
3559 | type_register_static(&char_gdb_type_info); | |
3560 | } | |
3561 | ||
3562 | type_init(register_types); | |
3563 | #endif |