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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 | #ifdef CONFIG_USER_ONLY | |
35 | #include "qemu.h" | |
36 | #else | |
37 | #include "monitor/monitor.h" | |
38 | #include "chardev/char.h" | |
39 | #include "chardev/char-fe.h" | |
40 | #include "sysemu/sysemu.h" | |
41 | #include "exec/gdbstub.h" | |
42 | #include "hw/cpu/cluster.h" | |
43 | #include "hw/boards.h" | |
44 | #endif | |
45 | ||
46 | #define MAX_PACKET_LENGTH 4096 | |
47 | ||
48 | #include "qemu/sockets.h" | |
49 | #include "sysemu/hw_accel.h" | |
50 | #include "sysemu/kvm.h" | |
51 | #include "sysemu/runstate.h" | |
52 | #include "hw/semihosting/semihost.h" | |
53 | #include "exec/exec-all.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_tid; | |
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 | static GDBState gdbserver_state; | |
379 | ||
380 | static void init_gdbserver_state(void) | |
381 | { | |
382 | g_assert(!gdbserver_state.init); | |
383 | memset(&gdbserver_state, 0, sizeof(GDBState)); | |
384 | gdbserver_state.init = true; | |
385 | gdbserver_state.str_buf = g_string_new(NULL); | |
386 | gdbserver_state.mem_buf = g_byte_array_sized_new(MAX_PACKET_LENGTH); | |
387 | gdbserver_state.last_packet = g_byte_array_sized_new(MAX_PACKET_LENGTH + 4); | |
388 | } | |
389 | ||
390 | #ifndef CONFIG_USER_ONLY | |
391 | static void reset_gdbserver_state(void) | |
392 | { | |
393 | g_free(gdbserver_state.processes); | |
394 | gdbserver_state.processes = NULL; | |
395 | gdbserver_state.process_num = 0; | |
396 | } | |
397 | #endif | |
398 | ||
399 | bool gdb_has_xml; | |
400 | ||
401 | #ifdef CONFIG_USER_ONLY | |
402 | ||
403 | static int get_char(void) | |
404 | { | |
405 | uint8_t ch; | |
406 | int ret; | |
407 | ||
408 | for(;;) { | |
409 | ret = qemu_recv(gdbserver_state.fd, &ch, 1, 0); | |
410 | if (ret < 0) { | |
411 | if (errno == ECONNRESET) | |
412 | gdbserver_state.fd = -1; | |
413 | if (errno != EINTR) | |
414 | return -1; | |
415 | } else if (ret == 0) { | |
416 | close(gdbserver_state.fd); | |
417 | gdbserver_state.fd = -1; | |
418 | return -1; | |
419 | } else { | |
420 | break; | |
421 | } | |
422 | } | |
423 | return ch; | |
424 | } | |
425 | #endif | |
426 | ||
427 | static enum { | |
428 | GDB_SYS_UNKNOWN, | |
429 | GDB_SYS_ENABLED, | |
430 | GDB_SYS_DISABLED, | |
431 | } gdb_syscall_mode; | |
432 | ||
433 | /* Decide if either remote gdb syscalls or native file IO should be used. */ | |
434 | int use_gdb_syscalls(void) | |
435 | { | |
436 | SemihostingTarget target = semihosting_get_target(); | |
437 | if (target == SEMIHOSTING_TARGET_NATIVE) { | |
438 | /* -semihosting-config target=native */ | |
439 | return false; | |
440 | } else if (target == SEMIHOSTING_TARGET_GDB) { | |
441 | /* -semihosting-config target=gdb */ | |
442 | return true; | |
443 | } | |
444 | ||
445 | /* -semihosting-config target=auto */ | |
446 | /* On the first call check if gdb is connected and remember. */ | |
447 | if (gdb_syscall_mode == GDB_SYS_UNKNOWN) { | |
448 | gdb_syscall_mode = gdbserver_state.init ? | |
449 | GDB_SYS_ENABLED : GDB_SYS_DISABLED; | |
450 | } | |
451 | return gdb_syscall_mode == GDB_SYS_ENABLED; | |
452 | } | |
453 | ||
454 | /* Resume execution. */ | |
455 | static inline void gdb_continue(void) | |
456 | { | |
457 | ||
458 | #ifdef CONFIG_USER_ONLY | |
459 | gdbserver_state.running_state = 1; | |
460 | trace_gdbstub_op_continue(); | |
461 | #else | |
462 | if (!runstate_needs_reset()) { | |
463 | trace_gdbstub_op_continue(); | |
464 | vm_start(); | |
465 | } | |
466 | #endif | |
467 | } | |
468 | ||
469 | /* | |
470 | * Resume execution, per CPU actions. For user-mode emulation it's | |
471 | * equivalent to gdb_continue. | |
472 | */ | |
473 | static int gdb_continue_partial(char *newstates) | |
474 | { | |
475 | CPUState *cpu; | |
476 | int res = 0; | |
477 | #ifdef CONFIG_USER_ONLY | |
478 | /* | |
479 | * This is not exactly accurate, but it's an improvement compared to the | |
480 | * previous situation, where only one CPU would be single-stepped. | |
481 | */ | |
482 | CPU_FOREACH(cpu) { | |
483 | if (newstates[cpu->cpu_index] == 's') { | |
484 | trace_gdbstub_op_stepping(cpu->cpu_index); | |
485 | cpu_single_step(cpu, sstep_flags); | |
486 | } | |
487 | } | |
488 | gdbserver_state.running_state = 1; | |
489 | #else | |
490 | int flag = 0; | |
491 | ||
492 | if (!runstate_needs_reset()) { | |
493 | if (vm_prepare_start()) { | |
494 | return 0; | |
495 | } | |
496 | ||
497 | CPU_FOREACH(cpu) { | |
498 | switch (newstates[cpu->cpu_index]) { | |
499 | case 0: | |
500 | case 1: | |
501 | break; /* nothing to do here */ | |
502 | case 's': | |
503 | trace_gdbstub_op_stepping(cpu->cpu_index); | |
504 | cpu_single_step(cpu, sstep_flags); | |
505 | cpu_resume(cpu); | |
506 | flag = 1; | |
507 | break; | |
508 | case 'c': | |
509 | trace_gdbstub_op_continue_cpu(cpu->cpu_index); | |
510 | cpu_resume(cpu); | |
511 | flag = 1; | |
512 | break; | |
513 | default: | |
514 | res = -1; | |
515 | break; | |
516 | } | |
517 | } | |
518 | } | |
519 | if (flag) { | |
520 | qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true); | |
521 | } | |
522 | #endif | |
523 | return res; | |
524 | } | |
525 | ||
526 | static void put_buffer(const uint8_t *buf, int len) | |
527 | { | |
528 | #ifdef CONFIG_USER_ONLY | |
529 | int ret; | |
530 | ||
531 | while (len > 0) { | |
532 | ret = send(gdbserver_state.fd, buf, len, 0); | |
533 | if (ret < 0) { | |
534 | if (errno != EINTR) | |
535 | return; | |
536 | } else { | |
537 | buf += ret; | |
538 | len -= ret; | |
539 | } | |
540 | } | |
541 | #else | |
542 | /* XXX this blocks entire thread. Rewrite to use | |
543 | * qemu_chr_fe_write and background I/O callbacks */ | |
544 | qemu_chr_fe_write_all(&gdbserver_state.chr, buf, len); | |
545 | #endif | |
546 | } | |
547 | ||
548 | static inline int fromhex(int v) | |
549 | { | |
550 | if (v >= '0' && v <= '9') | |
551 | return v - '0'; | |
552 | else if (v >= 'A' && v <= 'F') | |
553 | return v - 'A' + 10; | |
554 | else if (v >= 'a' && v <= 'f') | |
555 | return v - 'a' + 10; | |
556 | else | |
557 | return 0; | |
558 | } | |
559 | ||
560 | static inline int tohex(int v) | |
561 | { | |
562 | if (v < 10) | |
563 | return v + '0'; | |
564 | else | |
565 | return v - 10 + 'a'; | |
566 | } | |
567 | ||
568 | /* writes 2*len+1 bytes in buf */ | |
569 | static void memtohex(GString *buf, const uint8_t *mem, int len) | |
570 | { | |
571 | int i, c; | |
572 | for(i = 0; i < len; i++) { | |
573 | c = mem[i]; | |
574 | g_string_append_c(buf, tohex(c >> 4)); | |
575 | g_string_append_c(buf, tohex(c & 0xf)); | |
576 | } | |
577 | g_string_append_c(buf, '\0'); | |
578 | } | |
579 | ||
580 | static void hextomem(GByteArray *mem, const char *buf, int len) | |
581 | { | |
582 | int i; | |
583 | ||
584 | for(i = 0; i < len; i++) { | |
585 | guint8 byte = fromhex(buf[0]) << 4 | fromhex(buf[1]); | |
586 | g_byte_array_append(mem, &byte, 1); | |
587 | buf += 2; | |
588 | } | |
589 | } | |
590 | ||
591 | static void hexdump(const char *buf, int len, | |
592 | void (*trace_fn)(size_t ofs, char const *text)) | |
593 | { | |
594 | char line_buffer[3 * 16 + 4 + 16 + 1]; | |
595 | ||
596 | size_t i; | |
597 | for (i = 0; i < len || (i & 0xF); ++i) { | |
598 | size_t byte_ofs = i & 15; | |
599 | ||
600 | if (byte_ofs == 0) { | |
601 | memset(line_buffer, ' ', 3 * 16 + 4 + 16); | |
602 | line_buffer[3 * 16 + 4 + 16] = 0; | |
603 | } | |
604 | ||
605 | size_t col_group = (i >> 2) & 3; | |
606 | size_t hex_col = byte_ofs * 3 + col_group; | |
607 | size_t txt_col = 3 * 16 + 4 + byte_ofs; | |
608 | ||
609 | if (i < len) { | |
610 | char value = buf[i]; | |
611 | ||
612 | line_buffer[hex_col + 0] = tohex((value >> 4) & 0xF); | |
613 | line_buffer[hex_col + 1] = tohex((value >> 0) & 0xF); | |
614 | line_buffer[txt_col + 0] = (value >= ' ' && value < 127) | |
615 | ? value | |
616 | : '.'; | |
617 | } | |
618 | ||
619 | if (byte_ofs == 0xF) | |
620 | trace_fn(i & -16, line_buffer); | |
621 | } | |
622 | } | |
623 | ||
624 | /* return -1 if error, 0 if OK */ | |
625 | static int put_packet_binary(const char *buf, int len, bool dump) | |
626 | { | |
627 | int csum, i; | |
628 | uint8_t footer[3]; | |
629 | ||
630 | if (dump && trace_event_get_state_backends(TRACE_GDBSTUB_IO_BINARYREPLY)) { | |
631 | hexdump(buf, len, trace_gdbstub_io_binaryreply); | |
632 | } | |
633 | ||
634 | for(;;) { | |
635 | g_byte_array_set_size(gdbserver_state.last_packet, 0); | |
636 | g_byte_array_append(gdbserver_state.last_packet, | |
637 | (const uint8_t *) "$", 1); | |
638 | g_byte_array_append(gdbserver_state.last_packet, | |
639 | (const uint8_t *) buf, len); | |
640 | csum = 0; | |
641 | for(i = 0; i < len; i++) { | |
642 | csum += buf[i]; | |
643 | } | |
644 | footer[0] = '#'; | |
645 | footer[1] = tohex((csum >> 4) & 0xf); | |
646 | footer[2] = tohex((csum) & 0xf); | |
647 | g_byte_array_append(gdbserver_state.last_packet, footer, 3); | |
648 | ||
649 | put_buffer(gdbserver_state.last_packet->data, | |
650 | gdbserver_state.last_packet->len); | |
651 | ||
652 | #ifdef CONFIG_USER_ONLY | |
653 | i = get_char(); | |
654 | if (i < 0) | |
655 | return -1; | |
656 | if (i == '+') | |
657 | break; | |
658 | #else | |
659 | break; | |
660 | #endif | |
661 | } | |
662 | return 0; | |
663 | } | |
664 | ||
665 | /* return -1 if error, 0 if OK */ | |
666 | static int put_packet(const char *buf) | |
667 | { | |
668 | trace_gdbstub_io_reply(buf); | |
669 | ||
670 | return put_packet_binary(buf, strlen(buf), false); | |
671 | } | |
672 | ||
673 | static void put_strbuf(void) | |
674 | { | |
675 | put_packet(gdbserver_state.str_buf->str); | |
676 | } | |
677 | ||
678 | /* Encode data using the encoding for 'x' packets. */ | |
679 | static void memtox(GString *buf, const char *mem, int len) | |
680 | { | |
681 | char c; | |
682 | ||
683 | while (len--) { | |
684 | c = *(mem++); | |
685 | switch (c) { | |
686 | case '#': case '$': case '*': case '}': | |
687 | g_string_append_c(buf, '}'); | |
688 | g_string_append_c(buf, c ^ 0x20); | |
689 | break; | |
690 | default: | |
691 | g_string_append_c(buf, c); | |
692 | break; | |
693 | } | |
694 | } | |
695 | } | |
696 | ||
697 | static uint32_t gdb_get_cpu_pid(CPUState *cpu) | |
698 | { | |
699 | /* TODO: In user mode, we should use the task state PID */ | |
700 | if (cpu->cluster_index == UNASSIGNED_CLUSTER_INDEX) { | |
701 | /* Return the default process' PID */ | |
702 | int index = gdbserver_state.process_num - 1; | |
703 | return gdbserver_state.processes[index].pid; | |
704 | } | |
705 | return cpu->cluster_index + 1; | |
706 | } | |
707 | ||
708 | static GDBProcess *gdb_get_process(uint32_t pid) | |
709 | { | |
710 | int i; | |
711 | ||
712 | if (!pid) { | |
713 | /* 0 means any process, we take the first one */ | |
714 | return &gdbserver_state.processes[0]; | |
715 | } | |
716 | ||
717 | for (i = 0; i < gdbserver_state.process_num; i++) { | |
718 | if (gdbserver_state.processes[i].pid == pid) { | |
719 | return &gdbserver_state.processes[i]; | |
720 | } | |
721 | } | |
722 | ||
723 | return NULL; | |
724 | } | |
725 | ||
726 | static GDBProcess *gdb_get_cpu_process(CPUState *cpu) | |
727 | { | |
728 | return gdb_get_process(gdb_get_cpu_pid(cpu)); | |
729 | } | |
730 | ||
731 | static CPUState *find_cpu(uint32_t thread_id) | |
732 | { | |
733 | CPUState *cpu; | |
734 | ||
735 | CPU_FOREACH(cpu) { | |
736 | if (cpu_gdb_index(cpu) == thread_id) { | |
737 | return cpu; | |
738 | } | |
739 | } | |
740 | ||
741 | return NULL; | |
742 | } | |
743 | ||
744 | static CPUState *get_first_cpu_in_process(GDBProcess *process) | |
745 | { | |
746 | CPUState *cpu; | |
747 | ||
748 | CPU_FOREACH(cpu) { | |
749 | if (gdb_get_cpu_pid(cpu) == process->pid) { | |
750 | return cpu; | |
751 | } | |
752 | } | |
753 | ||
754 | return NULL; | |
755 | } | |
756 | ||
757 | static CPUState *gdb_next_cpu_in_process(CPUState *cpu) | |
758 | { | |
759 | uint32_t pid = gdb_get_cpu_pid(cpu); | |
760 | cpu = CPU_NEXT(cpu); | |
761 | ||
762 | while (cpu) { | |
763 | if (gdb_get_cpu_pid(cpu) == pid) { | |
764 | break; | |
765 | } | |
766 | ||
767 | cpu = CPU_NEXT(cpu); | |
768 | } | |
769 | ||
770 | return cpu; | |
771 | } | |
772 | ||
773 | /* Return the cpu following @cpu, while ignoring unattached processes. */ | |
774 | static CPUState *gdb_next_attached_cpu(CPUState *cpu) | |
775 | { | |
776 | cpu = CPU_NEXT(cpu); | |
777 | ||
778 | while (cpu) { | |
779 | if (gdb_get_cpu_process(cpu)->attached) { | |
780 | break; | |
781 | } | |
782 | ||
783 | cpu = CPU_NEXT(cpu); | |
784 | } | |
785 | ||
786 | return cpu; | |
787 | } | |
788 | ||
789 | /* Return the first attached cpu */ | |
790 | static CPUState *gdb_first_attached_cpu(void) | |
791 | { | |
792 | CPUState *cpu = first_cpu; | |
793 | GDBProcess *process = gdb_get_cpu_process(cpu); | |
794 | ||
795 | if (!process->attached) { | |
796 | return gdb_next_attached_cpu(cpu); | |
797 | } | |
798 | ||
799 | return cpu; | |
800 | } | |
801 | ||
802 | static CPUState *gdb_get_cpu(uint32_t pid, uint32_t tid) | |
803 | { | |
804 | GDBProcess *process; | |
805 | CPUState *cpu; | |
806 | ||
807 | if (!pid && !tid) { | |
808 | /* 0 means any process/thread, we take the first attached one */ | |
809 | return gdb_first_attached_cpu(); | |
810 | } else if (pid && !tid) { | |
811 | /* any thread in a specific process */ | |
812 | process = gdb_get_process(pid); | |
813 | ||
814 | if (process == NULL) { | |
815 | return NULL; | |
816 | } | |
817 | ||
818 | if (!process->attached) { | |
819 | return NULL; | |
820 | } | |
821 | ||
822 | return get_first_cpu_in_process(process); | |
823 | } else { | |
824 | /* a specific thread */ | |
825 | cpu = find_cpu(tid); | |
826 | ||
827 | if (cpu == NULL) { | |
828 | return NULL; | |
829 | } | |
830 | ||
831 | process = gdb_get_cpu_process(cpu); | |
832 | ||
833 | if (pid && process->pid != pid) { | |
834 | return NULL; | |
835 | } | |
836 | ||
837 | if (!process->attached) { | |
838 | return NULL; | |
839 | } | |
840 | ||
841 | return cpu; | |
842 | } | |
843 | } | |
844 | ||
845 | static const char *get_feature_xml(const char *p, const char **newp, | |
846 | GDBProcess *process) | |
847 | { | |
848 | size_t len; | |
849 | int i; | |
850 | const char *name; | |
851 | CPUState *cpu = get_first_cpu_in_process(process); | |
852 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
853 | ||
854 | len = 0; | |
855 | while (p[len] && p[len] != ':') | |
856 | len++; | |
857 | *newp = p + len; | |
858 | ||
859 | name = NULL; | |
860 | if (strncmp(p, "target.xml", len) == 0) { | |
861 | char *buf = process->target_xml; | |
862 | const size_t buf_sz = sizeof(process->target_xml); | |
863 | ||
864 | /* Generate the XML description for this CPU. */ | |
865 | if (!buf[0]) { | |
866 | GDBRegisterState *r; | |
867 | ||
868 | pstrcat(buf, buf_sz, | |
869 | "<?xml version=\"1.0\"?>" | |
870 | "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">" | |
871 | "<target>"); | |
872 | if (cc->gdb_arch_name) { | |
873 | gchar *arch = cc->gdb_arch_name(cpu); | |
874 | pstrcat(buf, buf_sz, "<architecture>"); | |
875 | pstrcat(buf, buf_sz, arch); | |
876 | pstrcat(buf, buf_sz, "</architecture>"); | |
877 | g_free(arch); | |
878 | } | |
879 | pstrcat(buf, buf_sz, "<xi:include href=\""); | |
880 | pstrcat(buf, buf_sz, cc->gdb_core_xml_file); | |
881 | pstrcat(buf, buf_sz, "\"/>"); | |
882 | for (r = cpu->gdb_regs; r; r = r->next) { | |
883 | pstrcat(buf, buf_sz, "<xi:include href=\""); | |
884 | pstrcat(buf, buf_sz, r->xml); | |
885 | pstrcat(buf, buf_sz, "\"/>"); | |
886 | } | |
887 | pstrcat(buf, buf_sz, "</target>"); | |
888 | } | |
889 | return buf; | |
890 | } | |
891 | if (cc->gdb_get_dynamic_xml) { | |
892 | char *xmlname = g_strndup(p, len); | |
893 | const char *xml = cc->gdb_get_dynamic_xml(cpu, xmlname); | |
894 | ||
895 | g_free(xmlname); | |
896 | if (xml) { | |
897 | return xml; | |
898 | } | |
899 | } | |
900 | for (i = 0; ; i++) { | |
901 | name = xml_builtin[i][0]; | |
902 | if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len)) | |
903 | break; | |
904 | } | |
905 | return name ? xml_builtin[i][1] : NULL; | |
906 | } | |
907 | ||
908 | static int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg) | |
909 | { | |
910 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
911 | CPUArchState *env = cpu->env_ptr; | |
912 | GDBRegisterState *r; | |
913 | ||
914 | if (reg < cc->gdb_num_core_regs) { | |
915 | return cc->gdb_read_register(cpu, buf, reg); | |
916 | } | |
917 | ||
918 | for (r = cpu->gdb_regs; r; r = r->next) { | |
919 | if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { | |
920 | return r->get_reg(env, buf, reg - r->base_reg); | |
921 | } | |
922 | } | |
923 | return 0; | |
924 | } | |
925 | ||
926 | static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) | |
927 | { | |
928 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
929 | CPUArchState *env = cpu->env_ptr; | |
930 | GDBRegisterState *r; | |
931 | ||
932 | if (reg < cc->gdb_num_core_regs) { | |
933 | return cc->gdb_write_register(cpu, mem_buf, reg); | |
934 | } | |
935 | ||
936 | for (r = cpu->gdb_regs; r; r = r->next) { | |
937 | if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) { | |
938 | return r->set_reg(env, mem_buf, reg - r->base_reg); | |
939 | } | |
940 | } | |
941 | return 0; | |
942 | } | |
943 | ||
944 | /* Register a supplemental set of CPU registers. If g_pos is nonzero it | |
945 | specifies the first register number and these registers are included in | |
946 | a standard "g" packet. Direction is relative to gdb, i.e. get_reg is | |
947 | gdb reading a CPU register, and set_reg is gdb modifying a CPU register. | |
948 | */ | |
949 | ||
950 | void gdb_register_coprocessor(CPUState *cpu, | |
951 | gdb_get_reg_cb get_reg, gdb_set_reg_cb set_reg, | |
952 | int num_regs, const char *xml, int g_pos) | |
953 | { | |
954 | GDBRegisterState *s; | |
955 | GDBRegisterState **p; | |
956 | ||
957 | p = &cpu->gdb_regs; | |
958 | while (*p) { | |
959 | /* Check for duplicates. */ | |
960 | if (strcmp((*p)->xml, xml) == 0) | |
961 | return; | |
962 | p = &(*p)->next; | |
963 | } | |
964 | ||
965 | s = g_new0(GDBRegisterState, 1); | |
966 | s->base_reg = cpu->gdb_num_regs; | |
967 | s->num_regs = num_regs; | |
968 | s->get_reg = get_reg; | |
969 | s->set_reg = set_reg; | |
970 | s->xml = xml; | |
971 | ||
972 | /* Add to end of list. */ | |
973 | cpu->gdb_num_regs += num_regs; | |
974 | *p = s; | |
975 | if (g_pos) { | |
976 | if (g_pos != s->base_reg) { | |
977 | error_report("Error: Bad gdb register numbering for '%s', " | |
978 | "expected %d got %d", xml, g_pos, s->base_reg); | |
979 | } else { | |
980 | cpu->gdb_num_g_regs = cpu->gdb_num_regs; | |
981 | } | |
982 | } | |
983 | } | |
984 | ||
985 | #ifndef CONFIG_USER_ONLY | |
986 | /* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */ | |
987 | static inline int xlat_gdb_type(CPUState *cpu, int gdbtype) | |
988 | { | |
989 | static const int xlat[] = { | |
990 | [GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE, | |
991 | [GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ, | |
992 | [GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS, | |
993 | }; | |
994 | ||
995 | CPUClass *cc = CPU_GET_CLASS(cpu); | |
996 | int cputype = xlat[gdbtype]; | |
997 | ||
998 | if (cc->gdb_stop_before_watchpoint) { | |
999 | cputype |= BP_STOP_BEFORE_ACCESS; | |
1000 | } | |
1001 | return cputype; | |
1002 | } | |
1003 | #endif | |
1004 | ||
1005 | static int gdb_breakpoint_insert(int type, target_ulong addr, target_ulong len) | |
1006 | { | |
1007 | CPUState *cpu; | |
1008 | int err = 0; | |
1009 | ||
1010 | if (kvm_enabled()) { | |
1011 | return kvm_insert_breakpoint(gdbserver_state.c_cpu, addr, len, type); | |
1012 | } | |
1013 | ||
1014 | switch (type) { | |
1015 | case GDB_BREAKPOINT_SW: | |
1016 | case GDB_BREAKPOINT_HW: | |
1017 | CPU_FOREACH(cpu) { | |
1018 | err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL); | |
1019 | if (err) { | |
1020 | break; | |
1021 | } | |
1022 | } | |
1023 | return err; | |
1024 | #ifndef CONFIG_USER_ONLY | |
1025 | case GDB_WATCHPOINT_WRITE: | |
1026 | case GDB_WATCHPOINT_READ: | |
1027 | case GDB_WATCHPOINT_ACCESS: | |
1028 | CPU_FOREACH(cpu) { | |
1029 | err = cpu_watchpoint_insert(cpu, addr, len, | |
1030 | xlat_gdb_type(cpu, type), NULL); | |
1031 | if (err) { | |
1032 | break; | |
1033 | } | |
1034 | } | |
1035 | return err; | |
1036 | #endif | |
1037 | default: | |
1038 | return -ENOSYS; | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | static int gdb_breakpoint_remove(int type, target_ulong addr, target_ulong len) | |
1043 | { | |
1044 | CPUState *cpu; | |
1045 | int err = 0; | |
1046 | ||
1047 | if (kvm_enabled()) { | |
1048 | return kvm_remove_breakpoint(gdbserver_state.c_cpu, addr, len, type); | |
1049 | } | |
1050 | ||
1051 | switch (type) { | |
1052 | case GDB_BREAKPOINT_SW: | |
1053 | case GDB_BREAKPOINT_HW: | |
1054 | CPU_FOREACH(cpu) { | |
1055 | err = cpu_breakpoint_remove(cpu, addr, BP_GDB); | |
1056 | if (err) { | |
1057 | break; | |
1058 | } | |
1059 | } | |
1060 | return err; | |
1061 | #ifndef CONFIG_USER_ONLY | |
1062 | case GDB_WATCHPOINT_WRITE: | |
1063 | case GDB_WATCHPOINT_READ: | |
1064 | case GDB_WATCHPOINT_ACCESS: | |
1065 | CPU_FOREACH(cpu) { | |
1066 | err = cpu_watchpoint_remove(cpu, addr, len, | |
1067 | xlat_gdb_type(cpu, type)); | |
1068 | if (err) | |
1069 | break; | |
1070 | } | |
1071 | return err; | |
1072 | #endif | |
1073 | default: | |
1074 | return -ENOSYS; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | static inline void gdb_cpu_breakpoint_remove_all(CPUState *cpu) | |
1079 | { | |
1080 | cpu_breakpoint_remove_all(cpu, BP_GDB); | |
1081 | #ifndef CONFIG_USER_ONLY | |
1082 | cpu_watchpoint_remove_all(cpu, BP_GDB); | |
1083 | #endif | |
1084 | } | |
1085 | ||
1086 | static void gdb_process_breakpoint_remove_all(GDBProcess *p) | |
1087 | { | |
1088 | CPUState *cpu = get_first_cpu_in_process(p); | |
1089 | ||
1090 | while (cpu) { | |
1091 | gdb_cpu_breakpoint_remove_all(cpu); | |
1092 | cpu = gdb_next_cpu_in_process(cpu); | |
1093 | } | |
1094 | } | |
1095 | ||
1096 | static void gdb_breakpoint_remove_all(void) | |
1097 | { | |
1098 | CPUState *cpu; | |
1099 | ||
1100 | if (kvm_enabled()) { | |
1101 | kvm_remove_all_breakpoints(gdbserver_state.c_cpu); | |
1102 | return; | |
1103 | } | |
1104 | ||
1105 | CPU_FOREACH(cpu) { | |
1106 | gdb_cpu_breakpoint_remove_all(cpu); | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | static void gdb_set_cpu_pc(target_ulong pc) | |
1111 | { | |
1112 | CPUState *cpu = gdbserver_state.c_cpu; | |
1113 | ||
1114 | cpu_synchronize_state(cpu); | |
1115 | cpu_set_pc(cpu, pc); | |
1116 | } | |
1117 | ||
1118 | static void gdb_append_thread_id(CPUState *cpu, GString *buf) | |
1119 | { | |
1120 | if (gdbserver_state.multiprocess) { | |
1121 | g_string_append_printf(buf, "p%02x.%02x", | |
1122 | gdb_get_cpu_pid(cpu), cpu_gdb_index(cpu)); | |
1123 | } else { | |
1124 | g_string_append_printf(buf, "%02x", cpu_gdb_index(cpu)); | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | typedef enum GDBThreadIdKind { | |
1129 | GDB_ONE_THREAD = 0, | |
1130 | GDB_ALL_THREADS, /* One process, all threads */ | |
1131 | GDB_ALL_PROCESSES, | |
1132 | GDB_READ_THREAD_ERR | |
1133 | } GDBThreadIdKind; | |
1134 | ||
1135 | static GDBThreadIdKind read_thread_id(const char *buf, const char **end_buf, | |
1136 | uint32_t *pid, uint32_t *tid) | |
1137 | { | |
1138 | unsigned long p, t; | |
1139 | int ret; | |
1140 | ||
1141 | if (*buf == 'p') { | |
1142 | buf++; | |
1143 | ret = qemu_strtoul(buf, &buf, 16, &p); | |
1144 | ||
1145 | if (ret) { | |
1146 | return GDB_READ_THREAD_ERR; | |
1147 | } | |
1148 | ||
1149 | /* Skip '.' */ | |
1150 | buf++; | |
1151 | } else { | |
1152 | p = 1; | |
1153 | } | |
1154 | ||
1155 | ret = qemu_strtoul(buf, &buf, 16, &t); | |
1156 | ||
1157 | if (ret) { | |
1158 | return GDB_READ_THREAD_ERR; | |
1159 | } | |
1160 | ||
1161 | *end_buf = buf; | |
1162 | ||
1163 | if (p == -1) { | |
1164 | return GDB_ALL_PROCESSES; | |
1165 | } | |
1166 | ||
1167 | if (pid) { | |
1168 | *pid = p; | |
1169 | } | |
1170 | ||
1171 | if (t == -1) { | |
1172 | return GDB_ALL_THREADS; | |
1173 | } | |
1174 | ||
1175 | if (tid) { | |
1176 | *tid = t; | |
1177 | } | |
1178 | ||
1179 | return GDB_ONE_THREAD; | |
1180 | } | |
1181 | ||
1182 | /** | |
1183 | * gdb_handle_vcont - Parses and handles a vCont packet. | |
1184 | * returns -ENOTSUP if a command is unsupported, -EINVAL or -ERANGE if there is | |
1185 | * a format error, 0 on success. | |
1186 | */ | |
1187 | static int gdb_handle_vcont(const char *p) | |
1188 | { | |
1189 | int res, signal = 0; | |
1190 | char cur_action; | |
1191 | char *newstates; | |
1192 | unsigned long tmp; | |
1193 | uint32_t pid, tid; | |
1194 | GDBProcess *process; | |
1195 | CPUState *cpu; | |
1196 | GDBThreadIdKind kind; | |
1197 | #ifdef CONFIG_USER_ONLY | |
1198 | int max_cpus = 1; /* global variable max_cpus exists only in system mode */ | |
1199 | ||
1200 | CPU_FOREACH(cpu) { | |
1201 | max_cpus = max_cpus <= cpu->cpu_index ? cpu->cpu_index + 1 : max_cpus; | |
1202 | } | |
1203 | #else | |
1204 | MachineState *ms = MACHINE(qdev_get_machine()); | |
1205 | unsigned int max_cpus = ms->smp.max_cpus; | |
1206 | #endif | |
1207 | /* uninitialised CPUs stay 0 */ | |
1208 | newstates = g_new0(char, max_cpus); | |
1209 | ||
1210 | /* mark valid CPUs with 1 */ | |
1211 | CPU_FOREACH(cpu) { | |
1212 | newstates[cpu->cpu_index] = 1; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * res keeps track of what error we are returning, with -ENOTSUP meaning | |
1217 | * that the command is unknown or unsupported, thus returning an empty | |
1218 | * packet, while -EINVAL and -ERANGE cause an E22 packet, due to invalid, | |
1219 | * or incorrect parameters passed. | |
1220 | */ | |
1221 | res = 0; | |
1222 | while (*p) { | |
1223 | if (*p++ != ';') { | |
1224 | res = -ENOTSUP; | |
1225 | goto out; | |
1226 | } | |
1227 | ||
1228 | cur_action = *p++; | |
1229 | if (cur_action == 'C' || cur_action == 'S') { | |
1230 | cur_action = qemu_tolower(cur_action); | |
1231 | res = qemu_strtoul(p + 1, &p, 16, &tmp); | |
1232 | if (res) { | |
1233 | goto out; | |
1234 | } | |
1235 | signal = gdb_signal_to_target(tmp); | |
1236 | } else if (cur_action != 'c' && cur_action != 's') { | |
1237 | /* unknown/invalid/unsupported command */ | |
1238 | res = -ENOTSUP; | |
1239 | goto out; | |
1240 | } | |
1241 | ||
1242 | if (*p == '\0' || *p == ';') { | |
1243 | /* | |
1244 | * No thread specifier, action is on "all threads". The | |
1245 | * specification is unclear regarding the process to act on. We | |
1246 | * choose all processes. | |
1247 | */ | |
1248 | kind = GDB_ALL_PROCESSES; | |
1249 | } else if (*p++ == ':') { | |
1250 | kind = read_thread_id(p, &p, &pid, &tid); | |
1251 | } else { | |
1252 | res = -ENOTSUP; | |
1253 | goto out; | |
1254 | } | |
1255 | ||
1256 | switch (kind) { | |
1257 | case GDB_READ_THREAD_ERR: | |
1258 | res = -EINVAL; | |
1259 | goto out; | |
1260 | ||
1261 | case GDB_ALL_PROCESSES: | |
1262 | cpu = gdb_first_attached_cpu(); | |
1263 | while (cpu) { | |
1264 | if (newstates[cpu->cpu_index] == 1) { | |
1265 | newstates[cpu->cpu_index] = cur_action; | |
1266 | } | |
1267 | ||
1268 | cpu = gdb_next_attached_cpu(cpu); | |
1269 | } | |
1270 | break; | |
1271 | ||
1272 | case GDB_ALL_THREADS: | |
1273 | process = gdb_get_process(pid); | |
1274 | ||
1275 | if (!process->attached) { | |
1276 | res = -EINVAL; | |
1277 | goto out; | |
1278 | } | |
1279 | ||
1280 | cpu = get_first_cpu_in_process(process); | |
1281 | while (cpu) { | |
1282 | if (newstates[cpu->cpu_index] == 1) { | |
1283 | newstates[cpu->cpu_index] = cur_action; | |
1284 | } | |
1285 | ||
1286 | cpu = gdb_next_cpu_in_process(cpu); | |
1287 | } | |
1288 | break; | |
1289 | ||
1290 | case GDB_ONE_THREAD: | |
1291 | cpu = gdb_get_cpu(pid, tid); | |
1292 | ||
1293 | /* invalid CPU/thread specified */ | |
1294 | if (!cpu) { | |
1295 | res = -EINVAL; | |
1296 | goto out; | |
1297 | } | |
1298 | ||
1299 | /* only use if no previous match occourred */ | |
1300 | if (newstates[cpu->cpu_index] == 1) { | |
1301 | newstates[cpu->cpu_index] = cur_action; | |
1302 | } | |
1303 | break; | |
1304 | } | |
1305 | } | |
1306 | gdbserver_state.signal = signal; | |
1307 | gdb_continue_partial(newstates); | |
1308 | ||
1309 | out: | |
1310 | g_free(newstates); | |
1311 | ||
1312 | return res; | |
1313 | } | |
1314 | ||
1315 | typedef union GdbCmdVariant { | |
1316 | const char *data; | |
1317 | uint8_t opcode; | |
1318 | unsigned long val_ul; | |
1319 | unsigned long long val_ull; | |
1320 | struct { | |
1321 | GDBThreadIdKind kind; | |
1322 | uint32_t pid; | |
1323 | uint32_t tid; | |
1324 | } thread_id; | |
1325 | } GdbCmdVariant; | |
1326 | ||
1327 | static const char *cmd_next_param(const char *param, const char delimiter) | |
1328 | { | |
1329 | static const char all_delimiters[] = ",;:="; | |
1330 | char curr_delimiters[2] = {0}; | |
1331 | const char *delimiters; | |
1332 | ||
1333 | if (delimiter == '?') { | |
1334 | delimiters = all_delimiters; | |
1335 | } else if (delimiter == '0') { | |
1336 | return strchr(param, '\0'); | |
1337 | } else if (delimiter == '.' && *param) { | |
1338 | return param + 1; | |
1339 | } else { | |
1340 | curr_delimiters[0] = delimiter; | |
1341 | delimiters = curr_delimiters; | |
1342 | } | |
1343 | ||
1344 | param += strcspn(param, delimiters); | |
1345 | if (*param) { | |
1346 | param++; | |
1347 | } | |
1348 | return param; | |
1349 | } | |
1350 | ||
1351 | static int cmd_parse_params(const char *data, const char *schema, | |
1352 | GdbCmdVariant *params, int *num_params) | |
1353 | { | |
1354 | int curr_param; | |
1355 | const char *curr_schema, *curr_data; | |
1356 | ||
1357 | *num_params = 0; | |
1358 | ||
1359 | if (!schema) { | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | curr_schema = schema; | |
1364 | curr_param = 0; | |
1365 | curr_data = data; | |
1366 | while (curr_schema[0] && curr_schema[1] && *curr_data) { | |
1367 | switch (curr_schema[0]) { | |
1368 | case 'l': | |
1369 | if (qemu_strtoul(curr_data, &curr_data, 16, | |
1370 | ¶ms[curr_param].val_ul)) { | |
1371 | return -EINVAL; | |
1372 | } | |
1373 | curr_param++; | |
1374 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1375 | break; | |
1376 | case 'L': | |
1377 | if (qemu_strtou64(curr_data, &curr_data, 16, | |
1378 | (uint64_t *)¶ms[curr_param].val_ull)) { | |
1379 | return -EINVAL; | |
1380 | } | |
1381 | curr_param++; | |
1382 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1383 | break; | |
1384 | case 's': | |
1385 | params[curr_param].data = curr_data; | |
1386 | curr_param++; | |
1387 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1388 | break; | |
1389 | case 'o': | |
1390 | params[curr_param].opcode = *(uint8_t *)curr_data; | |
1391 | curr_param++; | |
1392 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1393 | break; | |
1394 | case 't': | |
1395 | params[curr_param].thread_id.kind = | |
1396 | read_thread_id(curr_data, &curr_data, | |
1397 | ¶ms[curr_param].thread_id.pid, | |
1398 | ¶ms[curr_param].thread_id.tid); | |
1399 | curr_param++; | |
1400 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1401 | break; | |
1402 | case '?': | |
1403 | curr_data = cmd_next_param(curr_data, curr_schema[1]); | |
1404 | break; | |
1405 | default: | |
1406 | return -EINVAL; | |
1407 | } | |
1408 | curr_schema += 2; | |
1409 | } | |
1410 | ||
1411 | *num_params = curr_param; | |
1412 | return 0; | |
1413 | } | |
1414 | ||
1415 | typedef struct GdbCmdContext { | |
1416 | GdbCmdVariant *params; | |
1417 | int num_params; | |
1418 | } GdbCmdContext; | |
1419 | ||
1420 | typedef void (*GdbCmdHandler)(GdbCmdContext *gdb_ctx, void *user_ctx); | |
1421 | ||
1422 | /* | |
1423 | * cmd_startswith -> cmd is compared using startswith | |
1424 | * | |
1425 | * | |
1426 | * schema definitions: | |
1427 | * Each schema parameter entry consists of 2 chars, | |
1428 | * the first char represents the parameter type handling | |
1429 | * the second char represents the delimiter for the next parameter | |
1430 | * | |
1431 | * Currently supported schema types: | |
1432 | * 'l' -> unsigned long (stored in .val_ul) | |
1433 | * 'L' -> unsigned long long (stored in .val_ull) | |
1434 | * 's' -> string (stored in .data) | |
1435 | * 'o' -> single char (stored in .opcode) | |
1436 | * 't' -> thread id (stored in .thread_id) | |
1437 | * '?' -> skip according to delimiter | |
1438 | * | |
1439 | * Currently supported delimiters: | |
1440 | * '?' -> Stop at any delimiter (",;:=\0") | |
1441 | * '0' -> Stop at "\0" | |
1442 | * '.' -> Skip 1 char unless reached "\0" | |
1443 | * Any other value is treated as the delimiter value itself | |
1444 | */ | |
1445 | typedef struct GdbCmdParseEntry { | |
1446 | GdbCmdHandler handler; | |
1447 | const char *cmd; | |
1448 | bool cmd_startswith; | |
1449 | const char *schema; | |
1450 | } GdbCmdParseEntry; | |
1451 | ||
1452 | static inline int startswith(const char *string, const char *pattern) | |
1453 | { | |
1454 | return !strncmp(string, pattern, strlen(pattern)); | |
1455 | } | |
1456 | ||
1457 | static int process_string_cmd(void *user_ctx, const char *data, | |
1458 | const GdbCmdParseEntry *cmds, int num_cmds) | |
1459 | { | |
1460 | int i, schema_len, max_num_params = 0; | |
1461 | GdbCmdContext gdb_ctx; | |
1462 | ||
1463 | if (!cmds) { | |
1464 | return -1; | |
1465 | } | |
1466 | ||
1467 | for (i = 0; i < num_cmds; i++) { | |
1468 | const GdbCmdParseEntry *cmd = &cmds[i]; | |
1469 | g_assert(cmd->handler && cmd->cmd); | |
1470 | ||
1471 | if ((cmd->cmd_startswith && !startswith(data, cmd->cmd)) || | |
1472 | (!cmd->cmd_startswith && strcmp(cmd->cmd, data))) { | |
1473 | continue; | |
1474 | } | |
1475 | ||
1476 | if (cmd->schema) { | |
1477 | schema_len = strlen(cmd->schema); | |
1478 | if (schema_len % 2) { | |
1479 | return -2; | |
1480 | } | |
1481 | ||
1482 | max_num_params = schema_len / 2; | |
1483 | } | |
1484 | ||
1485 | gdb_ctx.params = | |
1486 | (GdbCmdVariant *)alloca(sizeof(*gdb_ctx.params) * max_num_params); | |
1487 | memset(gdb_ctx.params, 0, sizeof(*gdb_ctx.params) * max_num_params); | |
1488 | ||
1489 | if (cmd_parse_params(&data[strlen(cmd->cmd)], cmd->schema, | |
1490 | gdb_ctx.params, &gdb_ctx.num_params)) { | |
1491 | return -1; | |
1492 | } | |
1493 | ||
1494 | cmd->handler(&gdb_ctx, user_ctx); | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | return -1; | |
1499 | } | |
1500 | ||
1501 | static void run_cmd_parser(const char *data, const GdbCmdParseEntry *cmd) | |
1502 | { | |
1503 | if (!data) { | |
1504 | return; | |
1505 | } | |
1506 | ||
1507 | g_string_set_size(gdbserver_state.str_buf, 0); | |
1508 | g_byte_array_set_size(gdbserver_state.mem_buf, 0); | |
1509 | ||
1510 | /* In case there was an error during the command parsing we must | |
1511 | * send a NULL packet to indicate the command is not supported */ | |
1512 | if (process_string_cmd(NULL, data, cmd, 1)) { | |
1513 | put_packet(""); | |
1514 | } | |
1515 | } | |
1516 | ||
1517 | static void handle_detach(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1518 | { | |
1519 | GDBProcess *process; | |
1520 | uint32_t pid = 1; | |
1521 | ||
1522 | if (gdbserver_state.multiprocess) { | |
1523 | if (!gdb_ctx->num_params) { | |
1524 | put_packet("E22"); | |
1525 | return; | |
1526 | } | |
1527 | ||
1528 | pid = gdb_ctx->params[0].val_ul; | |
1529 | } | |
1530 | ||
1531 | process = gdb_get_process(pid); | |
1532 | gdb_process_breakpoint_remove_all(process); | |
1533 | process->attached = false; | |
1534 | ||
1535 | if (pid == gdb_get_cpu_pid(gdbserver_state.c_cpu)) { | |
1536 | gdbserver_state.c_cpu = gdb_first_attached_cpu(); | |
1537 | } | |
1538 | ||
1539 | if (pid == gdb_get_cpu_pid(gdbserver_state.g_cpu)) { | |
1540 | gdbserver_state.g_cpu = gdb_first_attached_cpu(); | |
1541 | } | |
1542 | ||
1543 | if (!gdbserver_state.c_cpu) { | |
1544 | /* No more process attached */ | |
1545 | gdb_syscall_mode = GDB_SYS_DISABLED; | |
1546 | gdb_continue(); | |
1547 | } | |
1548 | put_packet("OK"); | |
1549 | } | |
1550 | ||
1551 | static void handle_thread_alive(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1552 | { | |
1553 | CPUState *cpu; | |
1554 | ||
1555 | if (!gdb_ctx->num_params) { | |
1556 | put_packet("E22"); | |
1557 | return; | |
1558 | } | |
1559 | ||
1560 | if (gdb_ctx->params[0].thread_id.kind == GDB_READ_THREAD_ERR) { | |
1561 | put_packet("E22"); | |
1562 | return; | |
1563 | } | |
1564 | ||
1565 | cpu = gdb_get_cpu(gdb_ctx->params[0].thread_id.pid, | |
1566 | gdb_ctx->params[0].thread_id.tid); | |
1567 | if (!cpu) { | |
1568 | put_packet("E22"); | |
1569 | return; | |
1570 | } | |
1571 | ||
1572 | put_packet("OK"); | |
1573 | } | |
1574 | ||
1575 | static void handle_continue(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1576 | { | |
1577 | if (gdb_ctx->num_params) { | |
1578 | gdb_set_cpu_pc(gdb_ctx->params[0].val_ull); | |
1579 | } | |
1580 | ||
1581 | gdbserver_state.signal = 0; | |
1582 | gdb_continue(); | |
1583 | } | |
1584 | ||
1585 | static void handle_cont_with_sig(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1586 | { | |
1587 | unsigned long signal = 0; | |
1588 | ||
1589 | /* | |
1590 | * Note: C sig;[addr] is currently unsupported and we simply | |
1591 | * omit the addr parameter | |
1592 | */ | |
1593 | if (gdb_ctx->num_params) { | |
1594 | signal = gdb_ctx->params[0].val_ul; | |
1595 | } | |
1596 | ||
1597 | gdbserver_state.signal = gdb_signal_to_target(signal); | |
1598 | if (gdbserver_state.signal == -1) { | |
1599 | gdbserver_state.signal = 0; | |
1600 | } | |
1601 | gdb_continue(); | |
1602 | } | |
1603 | ||
1604 | static void handle_set_thread(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1605 | { | |
1606 | CPUState *cpu; | |
1607 | ||
1608 | if (gdb_ctx->num_params != 2) { | |
1609 | put_packet("E22"); | |
1610 | return; | |
1611 | } | |
1612 | ||
1613 | if (gdb_ctx->params[1].thread_id.kind == GDB_READ_THREAD_ERR) { | |
1614 | put_packet("E22"); | |
1615 | return; | |
1616 | } | |
1617 | ||
1618 | if (gdb_ctx->params[1].thread_id.kind != GDB_ONE_THREAD) { | |
1619 | put_packet("OK"); | |
1620 | return; | |
1621 | } | |
1622 | ||
1623 | cpu = gdb_get_cpu(gdb_ctx->params[1].thread_id.pid, | |
1624 | gdb_ctx->params[1].thread_id.tid); | |
1625 | if (!cpu) { | |
1626 | put_packet("E22"); | |
1627 | return; | |
1628 | } | |
1629 | ||
1630 | /* | |
1631 | * Note: This command is deprecated and modern gdb's will be using the | |
1632 | * vCont command instead. | |
1633 | */ | |
1634 | switch (gdb_ctx->params[0].opcode) { | |
1635 | case 'c': | |
1636 | gdbserver_state.c_cpu = cpu; | |
1637 | put_packet("OK"); | |
1638 | break; | |
1639 | case 'g': | |
1640 | gdbserver_state.g_cpu = cpu; | |
1641 | put_packet("OK"); | |
1642 | break; | |
1643 | default: | |
1644 | put_packet("E22"); | |
1645 | break; | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | static void handle_insert_bp(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1650 | { | |
1651 | int res; | |
1652 | ||
1653 | if (gdb_ctx->num_params != 3) { | |
1654 | put_packet("E22"); | |
1655 | return; | |
1656 | } | |
1657 | ||
1658 | res = gdb_breakpoint_insert(gdb_ctx->params[0].val_ul, | |
1659 | gdb_ctx->params[1].val_ull, | |
1660 | gdb_ctx->params[2].val_ull); | |
1661 | if (res >= 0) { | |
1662 | put_packet("OK"); | |
1663 | return; | |
1664 | } else if (res == -ENOSYS) { | |
1665 | put_packet(""); | |
1666 | return; | |
1667 | } | |
1668 | ||
1669 | put_packet("E22"); | |
1670 | } | |
1671 | ||
1672 | static void handle_remove_bp(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1673 | { | |
1674 | int res; | |
1675 | ||
1676 | if (gdb_ctx->num_params != 3) { | |
1677 | put_packet("E22"); | |
1678 | return; | |
1679 | } | |
1680 | ||
1681 | res = gdb_breakpoint_remove(gdb_ctx->params[0].val_ul, | |
1682 | gdb_ctx->params[1].val_ull, | |
1683 | gdb_ctx->params[2].val_ull); | |
1684 | if (res >= 0) { | |
1685 | put_packet("OK"); | |
1686 | return; | |
1687 | } else if (res == -ENOSYS) { | |
1688 | put_packet(""); | |
1689 | return; | |
1690 | } | |
1691 | ||
1692 | put_packet("E22"); | |
1693 | } | |
1694 | ||
1695 | /* | |
1696 | * handle_set/get_reg | |
1697 | * | |
1698 | * Older gdb are really dumb, and don't use 'G/g' if 'P/p' is available. | |
1699 | * This works, but can be very slow. Anything new enough to understand | |
1700 | * XML also knows how to use this properly. However to use this we | |
1701 | * need to define a local XML file as well as be talking to a | |
1702 | * reasonably modern gdb. Responding with an empty packet will cause | |
1703 | * the remote gdb to fallback to older methods. | |
1704 | */ | |
1705 | ||
1706 | static void handle_set_reg(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1707 | { | |
1708 | int reg_size; | |
1709 | ||
1710 | if (!gdb_has_xml) { | |
1711 | put_packet(""); | |
1712 | return; | |
1713 | } | |
1714 | ||
1715 | if (gdb_ctx->num_params != 2) { | |
1716 | put_packet("E22"); | |
1717 | return; | |
1718 | } | |
1719 | ||
1720 | reg_size = strlen(gdb_ctx->params[1].data) / 2; | |
1721 | hextomem(gdbserver_state.mem_buf, gdb_ctx->params[1].data, reg_size); | |
1722 | gdb_write_register(gdbserver_state.g_cpu, gdbserver_state.mem_buf->data, | |
1723 | gdb_ctx->params[0].val_ull); | |
1724 | put_packet("OK"); | |
1725 | } | |
1726 | ||
1727 | static void handle_get_reg(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1728 | { | |
1729 | int reg_size; | |
1730 | ||
1731 | if (!gdb_has_xml) { | |
1732 | put_packet(""); | |
1733 | return; | |
1734 | } | |
1735 | ||
1736 | if (!gdb_ctx->num_params) { | |
1737 | put_packet("E14"); | |
1738 | return; | |
1739 | } | |
1740 | ||
1741 | reg_size = gdb_read_register(gdbserver_state.g_cpu, | |
1742 | gdbserver_state.mem_buf, | |
1743 | gdb_ctx->params[0].val_ull); | |
1744 | if (!reg_size) { | |
1745 | put_packet("E14"); | |
1746 | return; | |
1747 | } else { | |
1748 | g_byte_array_set_size(gdbserver_state.mem_buf, reg_size); | |
1749 | } | |
1750 | ||
1751 | memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, reg_size); | |
1752 | put_strbuf(); | |
1753 | } | |
1754 | ||
1755 | static void handle_write_mem(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1756 | { | |
1757 | if (gdb_ctx->num_params != 3) { | |
1758 | put_packet("E22"); | |
1759 | return; | |
1760 | } | |
1761 | ||
1762 | /* hextomem() reads 2*len bytes */ | |
1763 | if (gdb_ctx->params[1].val_ull > strlen(gdb_ctx->params[2].data) / 2) { | |
1764 | put_packet("E22"); | |
1765 | return; | |
1766 | } | |
1767 | ||
1768 | hextomem(gdbserver_state.mem_buf, gdb_ctx->params[2].data, | |
1769 | gdb_ctx->params[1].val_ull); | |
1770 | if (target_memory_rw_debug(gdbserver_state.g_cpu, gdb_ctx->params[0].val_ull, | |
1771 | gdbserver_state.mem_buf->data, | |
1772 | gdbserver_state.mem_buf->len, true)) { | |
1773 | put_packet("E14"); | |
1774 | return; | |
1775 | } | |
1776 | ||
1777 | put_packet("OK"); | |
1778 | } | |
1779 | ||
1780 | static void handle_read_mem(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1781 | { | |
1782 | if (gdb_ctx->num_params != 2) { | |
1783 | put_packet("E22"); | |
1784 | return; | |
1785 | } | |
1786 | ||
1787 | /* memtohex() doubles the required space */ | |
1788 | if (gdb_ctx->params[1].val_ull > MAX_PACKET_LENGTH / 2) { | |
1789 | put_packet("E22"); | |
1790 | return; | |
1791 | } | |
1792 | ||
1793 | g_byte_array_set_size(gdbserver_state.mem_buf, gdb_ctx->params[1].val_ull); | |
1794 | ||
1795 | if (target_memory_rw_debug(gdbserver_state.g_cpu, gdb_ctx->params[0].val_ull, | |
1796 | gdbserver_state.mem_buf->data, | |
1797 | gdbserver_state.mem_buf->len, false)) { | |
1798 | put_packet("E14"); | |
1799 | return; | |
1800 | } | |
1801 | ||
1802 | memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, | |
1803 | gdbserver_state.mem_buf->len); | |
1804 | put_strbuf(); | |
1805 | } | |
1806 | ||
1807 | static void handle_write_all_regs(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1808 | { | |
1809 | target_ulong addr, len; | |
1810 | uint8_t *registers; | |
1811 | int reg_size; | |
1812 | ||
1813 | if (!gdb_ctx->num_params) { | |
1814 | return; | |
1815 | } | |
1816 | ||
1817 | cpu_synchronize_state(gdbserver_state.g_cpu); | |
1818 | len = strlen(gdb_ctx->params[0].data) / 2; | |
1819 | hextomem(gdbserver_state.mem_buf, gdb_ctx->params[0].data, len); | |
1820 | registers = gdbserver_state.mem_buf->data; | |
1821 | for (addr = 0; addr < gdbserver_state.g_cpu->gdb_num_g_regs && len > 0; | |
1822 | addr++) { | |
1823 | reg_size = gdb_write_register(gdbserver_state.g_cpu, registers, addr); | |
1824 | len -= reg_size; | |
1825 | registers += reg_size; | |
1826 | } | |
1827 | put_packet("OK"); | |
1828 | } | |
1829 | ||
1830 | static void handle_read_all_regs(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1831 | { | |
1832 | target_ulong addr, len; | |
1833 | ||
1834 | cpu_synchronize_state(gdbserver_state.g_cpu); | |
1835 | g_byte_array_set_size(gdbserver_state.mem_buf, 0); | |
1836 | len = 0; | |
1837 | for (addr = 0; addr < gdbserver_state.g_cpu->gdb_num_g_regs; addr++) { | |
1838 | len += gdb_read_register(gdbserver_state.g_cpu, | |
1839 | gdbserver_state.mem_buf, | |
1840 | addr); | |
1841 | } | |
1842 | g_assert(len == gdbserver_state.mem_buf->len); | |
1843 | ||
1844 | memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, len); | |
1845 | put_strbuf(); | |
1846 | } | |
1847 | ||
1848 | static void handle_file_io(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1849 | { | |
1850 | if (gdb_ctx->num_params >= 1 && gdbserver_state.current_syscall_cb) { | |
1851 | target_ulong ret, err; | |
1852 | ||
1853 | ret = (target_ulong)gdb_ctx->params[0].val_ull; | |
1854 | if (gdb_ctx->num_params >= 2) { | |
1855 | err = (target_ulong)gdb_ctx->params[1].val_ull; | |
1856 | } else { | |
1857 | err = 0; | |
1858 | } | |
1859 | gdbserver_state.current_syscall_cb(gdbserver_state.c_cpu, ret, err); | |
1860 | gdbserver_state.current_syscall_cb = NULL; | |
1861 | } | |
1862 | ||
1863 | if (gdb_ctx->num_params >= 3 && gdb_ctx->params[2].opcode == (uint8_t)'C') { | |
1864 | put_packet("T02"); | |
1865 | return; | |
1866 | } | |
1867 | ||
1868 | gdb_continue(); | |
1869 | } | |
1870 | ||
1871 | static void handle_step(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1872 | { | |
1873 | if (gdb_ctx->num_params) { | |
1874 | gdb_set_cpu_pc((target_ulong)gdb_ctx->params[0].val_ull); | |
1875 | } | |
1876 | ||
1877 | cpu_single_step(gdbserver_state.c_cpu, sstep_flags); | |
1878 | gdb_continue(); | |
1879 | } | |
1880 | ||
1881 | static void handle_v_cont_query(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1882 | { | |
1883 | put_packet("vCont;c;C;s;S"); | |
1884 | } | |
1885 | ||
1886 | static void handle_v_cont(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1887 | { | |
1888 | int res; | |
1889 | ||
1890 | if (!gdb_ctx->num_params) { | |
1891 | return; | |
1892 | } | |
1893 | ||
1894 | res = gdb_handle_vcont(gdb_ctx->params[0].data); | |
1895 | if ((res == -EINVAL) || (res == -ERANGE)) { | |
1896 | put_packet("E22"); | |
1897 | } else if (res) { | |
1898 | put_packet(""); | |
1899 | } | |
1900 | } | |
1901 | ||
1902 | static void handle_v_attach(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1903 | { | |
1904 | GDBProcess *process; | |
1905 | CPUState *cpu; | |
1906 | ||
1907 | g_string_assign(gdbserver_state.str_buf, "E22"); | |
1908 | if (!gdb_ctx->num_params) { | |
1909 | goto cleanup; | |
1910 | } | |
1911 | ||
1912 | process = gdb_get_process(gdb_ctx->params[0].val_ul); | |
1913 | if (!process) { | |
1914 | goto cleanup; | |
1915 | } | |
1916 | ||
1917 | cpu = get_first_cpu_in_process(process); | |
1918 | if (!cpu) { | |
1919 | goto cleanup; | |
1920 | } | |
1921 | ||
1922 | process->attached = true; | |
1923 | gdbserver_state.g_cpu = cpu; | |
1924 | gdbserver_state.c_cpu = cpu; | |
1925 | ||
1926 | g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP); | |
1927 | gdb_append_thread_id(cpu, gdbserver_state.str_buf); | |
1928 | g_string_append_c(gdbserver_state.str_buf, ';'); | |
1929 | cleanup: | |
1930 | put_strbuf(); | |
1931 | } | |
1932 | ||
1933 | static void handle_v_kill(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1934 | { | |
1935 | /* Kill the target */ | |
1936 | put_packet("OK"); | |
1937 | error_report("QEMU: Terminated via GDBstub"); | |
1938 | exit(0); | |
1939 | } | |
1940 | ||
1941 | static GdbCmdParseEntry gdb_v_commands_table[] = { | |
1942 | /* Order is important if has same prefix */ | |
1943 | { | |
1944 | .handler = handle_v_cont_query, | |
1945 | .cmd = "Cont?", | |
1946 | .cmd_startswith = 1 | |
1947 | }, | |
1948 | { | |
1949 | .handler = handle_v_cont, | |
1950 | .cmd = "Cont", | |
1951 | .cmd_startswith = 1, | |
1952 | .schema = "s0" | |
1953 | }, | |
1954 | { | |
1955 | .handler = handle_v_attach, | |
1956 | .cmd = "Attach;", | |
1957 | .cmd_startswith = 1, | |
1958 | .schema = "l0" | |
1959 | }, | |
1960 | { | |
1961 | .handler = handle_v_kill, | |
1962 | .cmd = "Kill;", | |
1963 | .cmd_startswith = 1 | |
1964 | }, | |
1965 | }; | |
1966 | ||
1967 | static void handle_v_commands(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1968 | { | |
1969 | if (!gdb_ctx->num_params) { | |
1970 | return; | |
1971 | } | |
1972 | ||
1973 | if (process_string_cmd(NULL, gdb_ctx->params[0].data, | |
1974 | gdb_v_commands_table, | |
1975 | ARRAY_SIZE(gdb_v_commands_table))) { | |
1976 | put_packet(""); | |
1977 | } | |
1978 | } | |
1979 | ||
1980 | static void handle_query_qemu_sstepbits(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1981 | { | |
1982 | g_string_printf(gdbserver_state.str_buf, "ENABLE=%x,NOIRQ=%x,NOTIMER=%x", | |
1983 | SSTEP_ENABLE, SSTEP_NOIRQ, SSTEP_NOTIMER); | |
1984 | put_strbuf(); | |
1985 | } | |
1986 | ||
1987 | static void handle_set_qemu_sstep(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1988 | { | |
1989 | if (!gdb_ctx->num_params) { | |
1990 | return; | |
1991 | } | |
1992 | ||
1993 | sstep_flags = gdb_ctx->params[0].val_ul; | |
1994 | put_packet("OK"); | |
1995 | } | |
1996 | ||
1997 | static void handle_query_qemu_sstep(GdbCmdContext *gdb_ctx, void *user_ctx) | |
1998 | { | |
1999 | g_string_printf(gdbserver_state.str_buf, "0x%x", sstep_flags); | |
2000 | put_strbuf(); | |
2001 | } | |
2002 | ||
2003 | static void handle_query_curr_tid(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2004 | { | |
2005 | CPUState *cpu; | |
2006 | GDBProcess *process; | |
2007 | ||
2008 | /* | |
2009 | * "Current thread" remains vague in the spec, so always return | |
2010 | * the first thread of the current process (gdb returns the | |
2011 | * first thread). | |
2012 | */ | |
2013 | process = gdb_get_cpu_process(gdbserver_state.g_cpu); | |
2014 | cpu = get_first_cpu_in_process(process); | |
2015 | g_string_assign(gdbserver_state.str_buf, "QC"); | |
2016 | gdb_append_thread_id(cpu, gdbserver_state.str_buf); | |
2017 | put_strbuf(); | |
2018 | } | |
2019 | ||
2020 | static void handle_query_threads(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2021 | { | |
2022 | if (!gdbserver_state.query_cpu) { | |
2023 | put_packet("l"); | |
2024 | return; | |
2025 | } | |
2026 | ||
2027 | g_string_assign(gdbserver_state.str_buf, "m"); | |
2028 | gdb_append_thread_id(gdbserver_state.query_cpu, gdbserver_state.str_buf); | |
2029 | put_strbuf(); | |
2030 | gdbserver_state.query_cpu = gdb_next_attached_cpu(gdbserver_state.query_cpu); | |
2031 | } | |
2032 | ||
2033 | static void handle_query_first_threads(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2034 | { | |
2035 | gdbserver_state.query_cpu = gdb_first_attached_cpu(); | |
2036 | handle_query_threads(gdb_ctx, user_ctx); | |
2037 | } | |
2038 | ||
2039 | static void handle_query_thread_extra(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2040 | { | |
2041 | g_autoptr(GString) rs = g_string_new(NULL); | |
2042 | CPUState *cpu; | |
2043 | ||
2044 | if (!gdb_ctx->num_params || | |
2045 | gdb_ctx->params[0].thread_id.kind == GDB_READ_THREAD_ERR) { | |
2046 | put_packet("E22"); | |
2047 | return; | |
2048 | } | |
2049 | ||
2050 | cpu = gdb_get_cpu(gdb_ctx->params[0].thread_id.pid, | |
2051 | gdb_ctx->params[0].thread_id.tid); | |
2052 | if (!cpu) { | |
2053 | return; | |
2054 | } | |
2055 | ||
2056 | cpu_synchronize_state(cpu); | |
2057 | ||
2058 | if (gdbserver_state.multiprocess && (gdbserver_state.process_num > 1)) { | |
2059 | /* Print the CPU model and name in multiprocess mode */ | |
2060 | ObjectClass *oc = object_get_class(OBJECT(cpu)); | |
2061 | const char *cpu_model = object_class_get_name(oc); | |
2062 | const char *cpu_name = | |
2063 | object_get_canonical_path_component(OBJECT(cpu)); | |
2064 | g_string_printf(rs, "%s %s [%s]", cpu_model, cpu_name, | |
2065 | cpu->halted ? "halted " : "running"); | |
2066 | } else { | |
2067 | g_string_printf(rs, "CPU#%d [%s]", cpu->cpu_index, | |
2068 | cpu->halted ? "halted " : "running"); | |
2069 | } | |
2070 | trace_gdbstub_op_extra_info(rs->str); | |
2071 | memtohex(gdbserver_state.str_buf, (uint8_t *)rs->str, rs->len); | |
2072 | put_strbuf(); | |
2073 | } | |
2074 | ||
2075 | #ifdef CONFIG_USER_ONLY | |
2076 | static void handle_query_offsets(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2077 | { | |
2078 | TaskState *ts; | |
2079 | ||
2080 | ts = gdbserver_state.c_cpu->opaque; | |
2081 | g_string_printf(gdbserver_state.str_buf, | |
2082 | "Text=" TARGET_ABI_FMT_lx | |
2083 | ";Data=" TARGET_ABI_FMT_lx | |
2084 | ";Bss=" TARGET_ABI_FMT_lx, | |
2085 | ts->info->code_offset, | |
2086 | ts->info->data_offset, | |
2087 | ts->info->data_offset); | |
2088 | put_strbuf(); | |
2089 | } | |
2090 | #else | |
2091 | static void handle_query_rcmd(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2092 | { | |
2093 | const guint8 zero = 0; | |
2094 | int len; | |
2095 | ||
2096 | if (!gdb_ctx->num_params) { | |
2097 | put_packet("E22"); | |
2098 | return; | |
2099 | } | |
2100 | ||
2101 | len = strlen(gdb_ctx->params[0].data); | |
2102 | if (len % 2) { | |
2103 | put_packet("E01"); | |
2104 | return; | |
2105 | } | |
2106 | ||
2107 | g_assert(gdbserver_state.mem_buf->len == 0); | |
2108 | len = len / 2; | |
2109 | hextomem(gdbserver_state.mem_buf, gdb_ctx->params[0].data, len); | |
2110 | g_byte_array_append(gdbserver_state.mem_buf, &zero, 1); | |
2111 | qemu_chr_be_write(gdbserver_state.mon_chr, gdbserver_state.mem_buf->data, | |
2112 | gdbserver_state.mem_buf->len); | |
2113 | put_packet("OK"); | |
2114 | } | |
2115 | #endif | |
2116 | ||
2117 | static void handle_query_supported(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2118 | { | |
2119 | CPUClass *cc; | |
2120 | ||
2121 | g_string_printf(gdbserver_state.str_buf, "PacketSize=%x", MAX_PACKET_LENGTH); | |
2122 | cc = CPU_GET_CLASS(first_cpu); | |
2123 | if (cc->gdb_core_xml_file) { | |
2124 | g_string_append(gdbserver_state.str_buf, ";qXfer:features:read+"); | |
2125 | } | |
2126 | ||
2127 | if (gdb_ctx->num_params && | |
2128 | strstr(gdb_ctx->params[0].data, "multiprocess+")) { | |
2129 | gdbserver_state.multiprocess = true; | |
2130 | } | |
2131 | ||
2132 | g_string_append(gdbserver_state.str_buf, ";vContSupported+;multiprocess+"); | |
2133 | put_strbuf(); | |
2134 | } | |
2135 | ||
2136 | static void handle_query_xfer_features(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2137 | { | |
2138 | GDBProcess *process; | |
2139 | CPUClass *cc; | |
2140 | unsigned long len, total_len, addr; | |
2141 | const char *xml; | |
2142 | const char *p; | |
2143 | ||
2144 | if (gdb_ctx->num_params < 3) { | |
2145 | put_packet("E22"); | |
2146 | return; | |
2147 | } | |
2148 | ||
2149 | process = gdb_get_cpu_process(gdbserver_state.g_cpu); | |
2150 | cc = CPU_GET_CLASS(gdbserver_state.g_cpu); | |
2151 | if (!cc->gdb_core_xml_file) { | |
2152 | put_packet(""); | |
2153 | return; | |
2154 | } | |
2155 | ||
2156 | gdb_has_xml = true; | |
2157 | p = gdb_ctx->params[0].data; | |
2158 | xml = get_feature_xml(p, &p, process); | |
2159 | if (!xml) { | |
2160 | put_packet("E00"); | |
2161 | return; | |
2162 | } | |
2163 | ||
2164 | addr = gdb_ctx->params[1].val_ul; | |
2165 | len = gdb_ctx->params[2].val_ul; | |
2166 | total_len = strlen(xml); | |
2167 | if (addr > total_len) { | |
2168 | put_packet("E00"); | |
2169 | return; | |
2170 | } | |
2171 | ||
2172 | if (len > (MAX_PACKET_LENGTH - 5) / 2) { | |
2173 | len = (MAX_PACKET_LENGTH - 5) / 2; | |
2174 | } | |
2175 | ||
2176 | if (len < total_len - addr) { | |
2177 | g_string_assign(gdbserver_state.str_buf, "m"); | |
2178 | memtox(gdbserver_state.str_buf, xml + addr, len); | |
2179 | } else { | |
2180 | g_string_assign(gdbserver_state.str_buf, "l"); | |
2181 | memtox(gdbserver_state.str_buf, xml + addr, total_len - addr); | |
2182 | } | |
2183 | ||
2184 | put_packet_binary(gdbserver_state.str_buf->str, | |
2185 | gdbserver_state.str_buf->len, true); | |
2186 | } | |
2187 | ||
2188 | static void handle_query_attached(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2189 | { | |
2190 | put_packet(GDB_ATTACHED); | |
2191 | } | |
2192 | ||
2193 | static void handle_query_qemu_supported(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2194 | { | |
2195 | g_string_printf(gdbserver_state.str_buf, "sstepbits;sstep"); | |
2196 | #ifndef CONFIG_USER_ONLY | |
2197 | g_string_append(gdbserver_state.str_buf, ";PhyMemMode"); | |
2198 | #endif | |
2199 | put_strbuf(); | |
2200 | } | |
2201 | ||
2202 | #ifndef CONFIG_USER_ONLY | |
2203 | static void handle_query_qemu_phy_mem_mode(GdbCmdContext *gdb_ctx, | |
2204 | void *user_ctx) | |
2205 | { | |
2206 | g_string_printf(gdbserver_state.str_buf, "%d", phy_memory_mode); | |
2207 | put_strbuf(); | |
2208 | } | |
2209 | ||
2210 | static void handle_set_qemu_phy_mem_mode(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2211 | { | |
2212 | if (!gdb_ctx->num_params) { | |
2213 | put_packet("E22"); | |
2214 | return; | |
2215 | } | |
2216 | ||
2217 | if (!gdb_ctx->params[0].val_ul) { | |
2218 | phy_memory_mode = 0; | |
2219 | } else { | |
2220 | phy_memory_mode = 1; | |
2221 | } | |
2222 | put_packet("OK"); | |
2223 | } | |
2224 | #endif | |
2225 | ||
2226 | static GdbCmdParseEntry gdb_gen_query_set_common_table[] = { | |
2227 | /* Order is important if has same prefix */ | |
2228 | { | |
2229 | .handler = handle_query_qemu_sstepbits, | |
2230 | .cmd = "qemu.sstepbits", | |
2231 | }, | |
2232 | { | |
2233 | .handler = handle_query_qemu_sstep, | |
2234 | .cmd = "qemu.sstep", | |
2235 | }, | |
2236 | { | |
2237 | .handler = handle_set_qemu_sstep, | |
2238 | .cmd = "qemu.sstep=", | |
2239 | .cmd_startswith = 1, | |
2240 | .schema = "l0" | |
2241 | }, | |
2242 | }; | |
2243 | ||
2244 | static GdbCmdParseEntry gdb_gen_query_table[] = { | |
2245 | { | |
2246 | .handler = handle_query_curr_tid, | |
2247 | .cmd = "C", | |
2248 | }, | |
2249 | { | |
2250 | .handler = handle_query_threads, | |
2251 | .cmd = "sThreadInfo", | |
2252 | }, | |
2253 | { | |
2254 | .handler = handle_query_first_threads, | |
2255 | .cmd = "fThreadInfo", | |
2256 | }, | |
2257 | { | |
2258 | .handler = handle_query_thread_extra, | |
2259 | .cmd = "ThreadExtraInfo,", | |
2260 | .cmd_startswith = 1, | |
2261 | .schema = "t0" | |
2262 | }, | |
2263 | #ifdef CONFIG_USER_ONLY | |
2264 | { | |
2265 | .handler = handle_query_offsets, | |
2266 | .cmd = "Offsets", | |
2267 | }, | |
2268 | #else | |
2269 | { | |
2270 | .handler = handle_query_rcmd, | |
2271 | .cmd = "Rcmd,", | |
2272 | .cmd_startswith = 1, | |
2273 | .schema = "s0" | |
2274 | }, | |
2275 | #endif | |
2276 | { | |
2277 | .handler = handle_query_supported, | |
2278 | .cmd = "Supported:", | |
2279 | .cmd_startswith = 1, | |
2280 | .schema = "s0" | |
2281 | }, | |
2282 | { | |
2283 | .handler = handle_query_supported, | |
2284 | .cmd = "Supported", | |
2285 | .schema = "s0" | |
2286 | }, | |
2287 | { | |
2288 | .handler = handle_query_xfer_features, | |
2289 | .cmd = "Xfer:features:read:", | |
2290 | .cmd_startswith = 1, | |
2291 | .schema = "s:l,l0" | |
2292 | }, | |
2293 | { | |
2294 | .handler = handle_query_attached, | |
2295 | .cmd = "Attached:", | |
2296 | .cmd_startswith = 1 | |
2297 | }, | |
2298 | { | |
2299 | .handler = handle_query_attached, | |
2300 | .cmd = "Attached", | |
2301 | }, | |
2302 | { | |
2303 | .handler = handle_query_qemu_supported, | |
2304 | .cmd = "qemu.Supported", | |
2305 | }, | |
2306 | #ifndef CONFIG_USER_ONLY | |
2307 | { | |
2308 | .handler = handle_query_qemu_phy_mem_mode, | |
2309 | .cmd = "qemu.PhyMemMode", | |
2310 | }, | |
2311 | #endif | |
2312 | }; | |
2313 | ||
2314 | static GdbCmdParseEntry gdb_gen_set_table[] = { | |
2315 | /* Order is important if has same prefix */ | |
2316 | { | |
2317 | .handler = handle_set_qemu_sstep, | |
2318 | .cmd = "qemu.sstep:", | |
2319 | .cmd_startswith = 1, | |
2320 | .schema = "l0" | |
2321 | }, | |
2322 | #ifndef CONFIG_USER_ONLY | |
2323 | { | |
2324 | .handler = handle_set_qemu_phy_mem_mode, | |
2325 | .cmd = "qemu.PhyMemMode:", | |
2326 | .cmd_startswith = 1, | |
2327 | .schema = "l0" | |
2328 | }, | |
2329 | #endif | |
2330 | }; | |
2331 | ||
2332 | static void handle_gen_query(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2333 | { | |
2334 | if (!gdb_ctx->num_params) { | |
2335 | return; | |
2336 | } | |
2337 | ||
2338 | if (!process_string_cmd(NULL, gdb_ctx->params[0].data, | |
2339 | gdb_gen_query_set_common_table, | |
2340 | ARRAY_SIZE(gdb_gen_query_set_common_table))) { | |
2341 | return; | |
2342 | } | |
2343 | ||
2344 | if (process_string_cmd(NULL, gdb_ctx->params[0].data, | |
2345 | gdb_gen_query_table, | |
2346 | ARRAY_SIZE(gdb_gen_query_table))) { | |
2347 | put_packet(""); | |
2348 | } | |
2349 | } | |
2350 | ||
2351 | static void handle_gen_set(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2352 | { | |
2353 | if (!gdb_ctx->num_params) { | |
2354 | return; | |
2355 | } | |
2356 | ||
2357 | if (!process_string_cmd(NULL, gdb_ctx->params[0].data, | |
2358 | gdb_gen_query_set_common_table, | |
2359 | ARRAY_SIZE(gdb_gen_query_set_common_table))) { | |
2360 | return; | |
2361 | } | |
2362 | ||
2363 | if (process_string_cmd(NULL, gdb_ctx->params[0].data, | |
2364 | gdb_gen_set_table, | |
2365 | ARRAY_SIZE(gdb_gen_set_table))) { | |
2366 | put_packet(""); | |
2367 | } | |
2368 | } | |
2369 | ||
2370 | static void handle_target_halt(GdbCmdContext *gdb_ctx, void *user_ctx) | |
2371 | { | |
2372 | g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP); | |
2373 | gdb_append_thread_id(gdbserver_state.c_cpu, gdbserver_state.str_buf); | |
2374 | g_string_append_c(gdbserver_state.str_buf, ';'); | |
2375 | put_strbuf(); | |
2376 | /* | |
2377 | * Remove all the breakpoints when this query is issued, | |
2378 | * because gdb is doing an initial connect and the state | |
2379 | * should be cleaned up. | |
2380 | */ | |
2381 | gdb_breakpoint_remove_all(); | |
2382 | } | |
2383 | ||
2384 | static int gdb_handle_packet(const char *line_buf) | |
2385 | { | |
2386 | const GdbCmdParseEntry *cmd_parser = NULL; | |
2387 | ||
2388 | trace_gdbstub_io_command(line_buf); | |
2389 | ||
2390 | switch (line_buf[0]) { | |
2391 | case '!': | |
2392 | put_packet("OK"); | |
2393 | break; | |
2394 | case '?': | |
2395 | { | |
2396 | static const GdbCmdParseEntry target_halted_cmd_desc = { | |
2397 | .handler = handle_target_halt, | |
2398 | .cmd = "?", | |
2399 | .cmd_startswith = 1 | |
2400 | }; | |
2401 | cmd_parser = &target_halted_cmd_desc; | |
2402 | } | |
2403 | break; | |
2404 | case 'c': | |
2405 | { | |
2406 | static const GdbCmdParseEntry continue_cmd_desc = { | |
2407 | .handler = handle_continue, | |
2408 | .cmd = "c", | |
2409 | .cmd_startswith = 1, | |
2410 | .schema = "L0" | |
2411 | }; | |
2412 | cmd_parser = &continue_cmd_desc; | |
2413 | } | |
2414 | break; | |
2415 | case 'C': | |
2416 | { | |
2417 | static const GdbCmdParseEntry cont_with_sig_cmd_desc = { | |
2418 | .handler = handle_cont_with_sig, | |
2419 | .cmd = "C", | |
2420 | .cmd_startswith = 1, | |
2421 | .schema = "l0" | |
2422 | }; | |
2423 | cmd_parser = &cont_with_sig_cmd_desc; | |
2424 | } | |
2425 | break; | |
2426 | case 'v': | |
2427 | { | |
2428 | static const GdbCmdParseEntry v_cmd_desc = { | |
2429 | .handler = handle_v_commands, | |
2430 | .cmd = "v", | |
2431 | .cmd_startswith = 1, | |
2432 | .schema = "s0" | |
2433 | }; | |
2434 | cmd_parser = &v_cmd_desc; | |
2435 | } | |
2436 | break; | |
2437 | case 'k': | |
2438 | /* Kill the target */ | |
2439 | error_report("QEMU: Terminated via GDBstub"); | |
2440 | exit(0); | |
2441 | case 'D': | |
2442 | { | |
2443 | static const GdbCmdParseEntry detach_cmd_desc = { | |
2444 | .handler = handle_detach, | |
2445 | .cmd = "D", | |
2446 | .cmd_startswith = 1, | |
2447 | .schema = "?.l0" | |
2448 | }; | |
2449 | cmd_parser = &detach_cmd_desc; | |
2450 | } | |
2451 | break; | |
2452 | case 's': | |
2453 | { | |
2454 | static const GdbCmdParseEntry step_cmd_desc = { | |
2455 | .handler = handle_step, | |
2456 | .cmd = "s", | |
2457 | .cmd_startswith = 1, | |
2458 | .schema = "L0" | |
2459 | }; | |
2460 | cmd_parser = &step_cmd_desc; | |
2461 | } | |
2462 | break; | |
2463 | case 'F': | |
2464 | { | |
2465 | static const GdbCmdParseEntry file_io_cmd_desc = { | |
2466 | .handler = handle_file_io, | |
2467 | .cmd = "F", | |
2468 | .cmd_startswith = 1, | |
2469 | .schema = "L,L,o0" | |
2470 | }; | |
2471 | cmd_parser = &file_io_cmd_desc; | |
2472 | } | |
2473 | break; | |
2474 | case 'g': | |
2475 | { | |
2476 | static const GdbCmdParseEntry read_all_regs_cmd_desc = { | |
2477 | .handler = handle_read_all_regs, | |
2478 | .cmd = "g", | |
2479 | .cmd_startswith = 1 | |
2480 | }; | |
2481 | cmd_parser = &read_all_regs_cmd_desc; | |
2482 | } | |
2483 | break; | |
2484 | case 'G': | |
2485 | { | |
2486 | static const GdbCmdParseEntry write_all_regs_cmd_desc = { | |
2487 | .handler = handle_write_all_regs, | |
2488 | .cmd = "G", | |
2489 | .cmd_startswith = 1, | |
2490 | .schema = "s0" | |
2491 | }; | |
2492 | cmd_parser = &write_all_regs_cmd_desc; | |
2493 | } | |
2494 | break; | |
2495 | case 'm': | |
2496 | { | |
2497 | static const GdbCmdParseEntry read_mem_cmd_desc = { | |
2498 | .handler = handle_read_mem, | |
2499 | .cmd = "m", | |
2500 | .cmd_startswith = 1, | |
2501 | .schema = "L,L0" | |
2502 | }; | |
2503 | cmd_parser = &read_mem_cmd_desc; | |
2504 | } | |
2505 | break; | |
2506 | case 'M': | |
2507 | { | |
2508 | static const GdbCmdParseEntry write_mem_cmd_desc = { | |
2509 | .handler = handle_write_mem, | |
2510 | .cmd = "M", | |
2511 | .cmd_startswith = 1, | |
2512 | .schema = "L,L:s0" | |
2513 | }; | |
2514 | cmd_parser = &write_mem_cmd_desc; | |
2515 | } | |
2516 | break; | |
2517 | case 'p': | |
2518 | { | |
2519 | static const GdbCmdParseEntry get_reg_cmd_desc = { | |
2520 | .handler = handle_get_reg, | |
2521 | .cmd = "p", | |
2522 | .cmd_startswith = 1, | |
2523 | .schema = "L0" | |
2524 | }; | |
2525 | cmd_parser = &get_reg_cmd_desc; | |
2526 | } | |
2527 | break; | |
2528 | case 'P': | |
2529 | { | |
2530 | static const GdbCmdParseEntry set_reg_cmd_desc = { | |
2531 | .handler = handle_set_reg, | |
2532 | .cmd = "P", | |
2533 | .cmd_startswith = 1, | |
2534 | .schema = "L?s0" | |
2535 | }; | |
2536 | cmd_parser = &set_reg_cmd_desc; | |
2537 | } | |
2538 | break; | |
2539 | case 'Z': | |
2540 | { | |
2541 | static const GdbCmdParseEntry insert_bp_cmd_desc = { | |
2542 | .handler = handle_insert_bp, | |
2543 | .cmd = "Z", | |
2544 | .cmd_startswith = 1, | |
2545 | .schema = "l?L?L0" | |
2546 | }; | |
2547 | cmd_parser = &insert_bp_cmd_desc; | |
2548 | } | |
2549 | break; | |
2550 | case 'z': | |
2551 | { | |
2552 | static const GdbCmdParseEntry remove_bp_cmd_desc = { | |
2553 | .handler = handle_remove_bp, | |
2554 | .cmd = "z", | |
2555 | .cmd_startswith = 1, | |
2556 | .schema = "l?L?L0" | |
2557 | }; | |
2558 | cmd_parser = &remove_bp_cmd_desc; | |
2559 | } | |
2560 | break; | |
2561 | case 'H': | |
2562 | { | |
2563 | static const GdbCmdParseEntry set_thread_cmd_desc = { | |
2564 | .handler = handle_set_thread, | |
2565 | .cmd = "H", | |
2566 | .cmd_startswith = 1, | |
2567 | .schema = "o.t0" | |
2568 | }; | |
2569 | cmd_parser = &set_thread_cmd_desc; | |
2570 | } | |
2571 | break; | |
2572 | case 'T': | |
2573 | { | |
2574 | static const GdbCmdParseEntry thread_alive_cmd_desc = { | |
2575 | .handler = handle_thread_alive, | |
2576 | .cmd = "T", | |
2577 | .cmd_startswith = 1, | |
2578 | .schema = "t0" | |
2579 | }; | |
2580 | cmd_parser = &thread_alive_cmd_desc; | |
2581 | } | |
2582 | break; | |
2583 | case 'q': | |
2584 | { | |
2585 | static const GdbCmdParseEntry gen_query_cmd_desc = { | |
2586 | .handler = handle_gen_query, | |
2587 | .cmd = "q", | |
2588 | .cmd_startswith = 1, | |
2589 | .schema = "s0" | |
2590 | }; | |
2591 | cmd_parser = &gen_query_cmd_desc; | |
2592 | } | |
2593 | break; | |
2594 | case 'Q': | |
2595 | { | |
2596 | static const GdbCmdParseEntry gen_set_cmd_desc = { | |
2597 | .handler = handle_gen_set, | |
2598 | .cmd = "Q", | |
2599 | .cmd_startswith = 1, | |
2600 | .schema = "s0" | |
2601 | }; | |
2602 | cmd_parser = &gen_set_cmd_desc; | |
2603 | } | |
2604 | break; | |
2605 | default: | |
2606 | /* put empty packet */ | |
2607 | put_packet(""); | |
2608 | break; | |
2609 | } | |
2610 | ||
2611 | if (cmd_parser) { | |
2612 | run_cmd_parser(line_buf, cmd_parser); | |
2613 | } | |
2614 | ||
2615 | return RS_IDLE; | |
2616 | } | |
2617 | ||
2618 | void gdb_set_stop_cpu(CPUState *cpu) | |
2619 | { | |
2620 | GDBProcess *p = gdb_get_cpu_process(cpu); | |
2621 | ||
2622 | if (!p->attached) { | |
2623 | /* | |
2624 | * Having a stop CPU corresponding to a process that is not attached | |
2625 | * confuses GDB. So we ignore the request. | |
2626 | */ | |
2627 | return; | |
2628 | } | |
2629 | ||
2630 | gdbserver_state.c_cpu = cpu; | |
2631 | gdbserver_state.g_cpu = cpu; | |
2632 | } | |
2633 | ||
2634 | #ifndef CONFIG_USER_ONLY | |
2635 | static void gdb_vm_state_change(void *opaque, int running, RunState state) | |
2636 | { | |
2637 | CPUState *cpu = gdbserver_state.c_cpu; | |
2638 | g_autoptr(GString) buf = g_string_new(NULL); | |
2639 | g_autoptr(GString) tid = g_string_new(NULL); | |
2640 | const char *type; | |
2641 | int ret; | |
2642 | ||
2643 | if (running || gdbserver_state.state == RS_INACTIVE) { | |
2644 | return; | |
2645 | } | |
2646 | /* Is there a GDB syscall waiting to be sent? */ | |
2647 | if (gdbserver_state.current_syscall_cb) { | |
2648 | put_packet(gdbserver_state.syscall_buf); | |
2649 | return; | |
2650 | } | |
2651 | ||
2652 | if (cpu == NULL) { | |
2653 | /* No process attached */ | |
2654 | return; | |
2655 | } | |
2656 | ||
2657 | gdb_append_thread_id(cpu, tid); | |
2658 | ||
2659 | switch (state) { | |
2660 | case RUN_STATE_DEBUG: | |
2661 | if (cpu->watchpoint_hit) { | |
2662 | switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) { | |
2663 | case BP_MEM_READ: | |
2664 | type = "r"; | |
2665 | break; | |
2666 | case BP_MEM_ACCESS: | |
2667 | type = "a"; | |
2668 | break; | |
2669 | default: | |
2670 | type = ""; | |
2671 | break; | |
2672 | } | |
2673 | trace_gdbstub_hit_watchpoint(type, cpu_gdb_index(cpu), | |
2674 | (target_ulong)cpu->watchpoint_hit->vaddr); | |
2675 | g_string_printf(buf, "T%02xthread:%s;%swatch:" TARGET_FMT_lx ";", | |
2676 | GDB_SIGNAL_TRAP, tid->str, type, | |
2677 | (target_ulong)cpu->watchpoint_hit->vaddr); | |
2678 | cpu->watchpoint_hit = NULL; | |
2679 | goto send_packet; | |
2680 | } else { | |
2681 | trace_gdbstub_hit_break(); | |
2682 | } | |
2683 | tb_flush(cpu); | |
2684 | ret = GDB_SIGNAL_TRAP; | |
2685 | break; | |
2686 | case RUN_STATE_PAUSED: | |
2687 | trace_gdbstub_hit_paused(); | |
2688 | ret = GDB_SIGNAL_INT; | |
2689 | break; | |
2690 | case RUN_STATE_SHUTDOWN: | |
2691 | trace_gdbstub_hit_shutdown(); | |
2692 | ret = GDB_SIGNAL_QUIT; | |
2693 | break; | |
2694 | case RUN_STATE_IO_ERROR: | |
2695 | trace_gdbstub_hit_io_error(); | |
2696 | ret = GDB_SIGNAL_IO; | |
2697 | break; | |
2698 | case RUN_STATE_WATCHDOG: | |
2699 | trace_gdbstub_hit_watchdog(); | |
2700 | ret = GDB_SIGNAL_ALRM; | |
2701 | break; | |
2702 | case RUN_STATE_INTERNAL_ERROR: | |
2703 | trace_gdbstub_hit_internal_error(); | |
2704 | ret = GDB_SIGNAL_ABRT; | |
2705 | break; | |
2706 | case RUN_STATE_SAVE_VM: | |
2707 | case RUN_STATE_RESTORE_VM: | |
2708 | return; | |
2709 | case RUN_STATE_FINISH_MIGRATE: | |
2710 | ret = GDB_SIGNAL_XCPU; | |
2711 | break; | |
2712 | default: | |
2713 | trace_gdbstub_hit_unknown(state); | |
2714 | ret = GDB_SIGNAL_UNKNOWN; | |
2715 | break; | |
2716 | } | |
2717 | gdb_set_stop_cpu(cpu); | |
2718 | g_string_printf(buf, "T%02xthread:%s;", ret, tid->str); | |
2719 | ||
2720 | send_packet: | |
2721 | put_packet(buf->str); | |
2722 | ||
2723 | /* disable single step if it was enabled */ | |
2724 | cpu_single_step(cpu, 0); | |
2725 | } | |
2726 | #endif | |
2727 | ||
2728 | /* Send a gdb syscall request. | |
2729 | This accepts limited printf-style format specifiers, specifically: | |
2730 | %x - target_ulong argument printed in hex. | |
2731 | %lx - 64-bit argument printed in hex. | |
2732 | %s - string pointer (target_ulong) and length (int) pair. */ | |
2733 | void gdb_do_syscallv(gdb_syscall_complete_cb cb, const char *fmt, va_list va) | |
2734 | { | |
2735 | char *p; | |
2736 | char *p_end; | |
2737 | target_ulong addr; | |
2738 | uint64_t i64; | |
2739 | ||
2740 | if (!gdbserver_state.init) { | |
2741 | return; | |
2742 | } | |
2743 | ||
2744 | gdbserver_state.current_syscall_cb = cb; | |
2745 | #ifndef CONFIG_USER_ONLY | |
2746 | vm_stop(RUN_STATE_DEBUG); | |
2747 | #endif | |
2748 | p = &gdbserver_state.syscall_buf[0]; | |
2749 | p_end = &gdbserver_state.syscall_buf[sizeof(gdbserver_state.syscall_buf)]; | |
2750 | *(p++) = 'F'; | |
2751 | while (*fmt) { | |
2752 | if (*fmt == '%') { | |
2753 | fmt++; | |
2754 | switch (*fmt++) { | |
2755 | case 'x': | |
2756 | addr = va_arg(va, target_ulong); | |
2757 | p += snprintf(p, p_end - p, TARGET_FMT_lx, addr); | |
2758 | break; | |
2759 | case 'l': | |
2760 | if (*(fmt++) != 'x') | |
2761 | goto bad_format; | |
2762 | i64 = va_arg(va, uint64_t); | |
2763 | p += snprintf(p, p_end - p, "%" PRIx64, i64); | |
2764 | break; | |
2765 | case 's': | |
2766 | addr = va_arg(va, target_ulong); | |
2767 | p += snprintf(p, p_end - p, TARGET_FMT_lx "/%x", | |
2768 | addr, va_arg(va, int)); | |
2769 | break; | |
2770 | default: | |
2771 | bad_format: | |
2772 | error_report("gdbstub: Bad syscall format string '%s'", | |
2773 | fmt - 1); | |
2774 | break; | |
2775 | } | |
2776 | } else { | |
2777 | *(p++) = *(fmt++); | |
2778 | } | |
2779 | } | |
2780 | *p = 0; | |
2781 | #ifdef CONFIG_USER_ONLY | |
2782 | put_packet(gdbserver_state.syscall_buf); | |
2783 | /* Return control to gdb for it to process the syscall request. | |
2784 | * Since the protocol requires that gdb hands control back to us | |
2785 | * using a "here are the results" F packet, we don't need to check | |
2786 | * gdb_handlesig's return value (which is the signal to deliver if | |
2787 | * execution was resumed via a continue packet). | |
2788 | */ | |
2789 | gdb_handlesig(gdbserver_state.c_cpu, 0); | |
2790 | #else | |
2791 | /* In this case wait to send the syscall packet until notification that | |
2792 | the CPU has stopped. This must be done because if the packet is sent | |
2793 | now the reply from the syscall request could be received while the CPU | |
2794 | is still in the running state, which can cause packets to be dropped | |
2795 | and state transition 'T' packets to be sent while the syscall is still | |
2796 | being processed. */ | |
2797 | qemu_cpu_kick(gdbserver_state.c_cpu); | |
2798 | #endif | |
2799 | } | |
2800 | ||
2801 | void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) | |
2802 | { | |
2803 | va_list va; | |
2804 | ||
2805 | va_start(va, fmt); | |
2806 | gdb_do_syscallv(cb, fmt, va); | |
2807 | va_end(va); | |
2808 | } | |
2809 | ||
2810 | static void gdb_read_byte(uint8_t ch) | |
2811 | { | |
2812 | uint8_t reply; | |
2813 | ||
2814 | #ifndef CONFIG_USER_ONLY | |
2815 | if (gdbserver_state.last_packet->len) { | |
2816 | /* Waiting for a response to the last packet. If we see the start | |
2817 | of a new command then abandon the previous response. */ | |
2818 | if (ch == '-') { | |
2819 | trace_gdbstub_err_got_nack(); | |
2820 | put_buffer(gdbserver_state.last_packet->data, | |
2821 | gdbserver_state.last_packet->len); | |
2822 | } else if (ch == '+') { | |
2823 | trace_gdbstub_io_got_ack(); | |
2824 | } else { | |
2825 | trace_gdbstub_io_got_unexpected(ch); | |
2826 | } | |
2827 | ||
2828 | if (ch == '+' || ch == '$') { | |
2829 | g_byte_array_set_size(gdbserver_state.last_packet, 0); | |
2830 | } | |
2831 | if (ch != '$') | |
2832 | return; | |
2833 | } | |
2834 | if (runstate_is_running()) { | |
2835 | /* when the CPU is running, we cannot do anything except stop | |
2836 | it when receiving a char */ | |
2837 | vm_stop(RUN_STATE_PAUSED); | |
2838 | } else | |
2839 | #endif | |
2840 | { | |
2841 | switch(gdbserver_state.state) { | |
2842 | case RS_IDLE: | |
2843 | if (ch == '$') { | |
2844 | /* start of command packet */ | |
2845 | gdbserver_state.line_buf_index = 0; | |
2846 | gdbserver_state.line_sum = 0; | |
2847 | gdbserver_state.state = RS_GETLINE; | |
2848 | } else { | |
2849 | trace_gdbstub_err_garbage(ch); | |
2850 | } | |
2851 | break; | |
2852 | case RS_GETLINE: | |
2853 | if (ch == '}') { | |
2854 | /* start escape sequence */ | |
2855 | gdbserver_state.state = RS_GETLINE_ESC; | |
2856 | gdbserver_state.line_sum += ch; | |
2857 | } else if (ch == '*') { | |
2858 | /* start run length encoding sequence */ | |
2859 | gdbserver_state.state = RS_GETLINE_RLE; | |
2860 | gdbserver_state.line_sum += ch; | |
2861 | } else if (ch == '#') { | |
2862 | /* end of command, start of checksum*/ | |
2863 | gdbserver_state.state = RS_CHKSUM1; | |
2864 | } else if (gdbserver_state.line_buf_index >= sizeof(gdbserver_state.line_buf) - 1) { | |
2865 | trace_gdbstub_err_overrun(); | |
2866 | gdbserver_state.state = RS_IDLE; | |
2867 | } else { | |
2868 | /* unescaped command character */ | |
2869 | gdbserver_state.line_buf[gdbserver_state.line_buf_index++] = ch; | |
2870 | gdbserver_state.line_sum += ch; | |
2871 | } | |
2872 | break; | |
2873 | case RS_GETLINE_ESC: | |
2874 | if (ch == '#') { | |
2875 | /* unexpected end of command in escape sequence */ | |
2876 | gdbserver_state.state = RS_CHKSUM1; | |
2877 | } else if (gdbserver_state.line_buf_index >= sizeof(gdbserver_state.line_buf) - 1) { | |
2878 | /* command buffer overrun */ | |
2879 | trace_gdbstub_err_overrun(); | |
2880 | gdbserver_state.state = RS_IDLE; | |
2881 | } else { | |
2882 | /* parse escaped character and leave escape state */ | |
2883 | gdbserver_state.line_buf[gdbserver_state.line_buf_index++] = ch ^ 0x20; | |
2884 | gdbserver_state.line_sum += ch; | |
2885 | gdbserver_state.state = RS_GETLINE; | |
2886 | } | |
2887 | break; | |
2888 | case RS_GETLINE_RLE: | |
2889 | /* | |
2890 | * Run-length encoding is explained in "Debugging with GDB / | |
2891 | * Appendix E GDB Remote Serial Protocol / Overview". | |
2892 | */ | |
2893 | if (ch < ' ' || ch == '#' || ch == '$' || ch > 126) { | |
2894 | /* invalid RLE count encoding */ | |
2895 | trace_gdbstub_err_invalid_repeat(ch); | |
2896 | gdbserver_state.state = RS_GETLINE; | |
2897 | } else { | |
2898 | /* decode repeat length */ | |
2899 | int repeat = ch - ' ' + 3; | |
2900 | if (gdbserver_state.line_buf_index + repeat >= sizeof(gdbserver_state.line_buf) - 1) { | |
2901 | /* that many repeats would overrun the command buffer */ | |
2902 | trace_gdbstub_err_overrun(); | |
2903 | gdbserver_state.state = RS_IDLE; | |
2904 | } else if (gdbserver_state.line_buf_index < 1) { | |
2905 | /* got a repeat but we have nothing to repeat */ | |
2906 | trace_gdbstub_err_invalid_rle(); | |
2907 | gdbserver_state.state = RS_GETLINE; | |
2908 | } else { | |
2909 | /* repeat the last character */ | |
2910 | memset(gdbserver_state.line_buf + gdbserver_state.line_buf_index, | |
2911 | gdbserver_state.line_buf[gdbserver_state.line_buf_index - 1], repeat); | |
2912 | gdbserver_state.line_buf_index += repeat; | |
2913 | gdbserver_state.line_sum += ch; | |
2914 | gdbserver_state.state = RS_GETLINE; | |
2915 | } | |
2916 | } | |
2917 | break; | |
2918 | case RS_CHKSUM1: | |
2919 | /* get high hex digit of checksum */ | |
2920 | if (!isxdigit(ch)) { | |
2921 | trace_gdbstub_err_checksum_invalid(ch); | |
2922 | gdbserver_state.state = RS_GETLINE; | |
2923 | break; | |
2924 | } | |
2925 | gdbserver_state.line_buf[gdbserver_state.line_buf_index] = '\0'; | |
2926 | gdbserver_state.line_csum = fromhex(ch) << 4; | |
2927 | gdbserver_state.state = RS_CHKSUM2; | |
2928 | break; | |
2929 | case RS_CHKSUM2: | |
2930 | /* get low hex digit of checksum */ | |
2931 | if (!isxdigit(ch)) { | |
2932 | trace_gdbstub_err_checksum_invalid(ch); | |
2933 | gdbserver_state.state = RS_GETLINE; | |
2934 | break; | |
2935 | } | |
2936 | gdbserver_state.line_csum |= fromhex(ch); | |
2937 | ||
2938 | if (gdbserver_state.line_csum != (gdbserver_state.line_sum & 0xff)) { | |
2939 | trace_gdbstub_err_checksum_incorrect(gdbserver_state.line_sum, gdbserver_state.line_csum); | |
2940 | /* send NAK reply */ | |
2941 | reply = '-'; | |
2942 | put_buffer(&reply, 1); | |
2943 | gdbserver_state.state = RS_IDLE; | |
2944 | } else { | |
2945 | /* send ACK reply */ | |
2946 | reply = '+'; | |
2947 | put_buffer(&reply, 1); | |
2948 | gdbserver_state.state = gdb_handle_packet(gdbserver_state.line_buf); | |
2949 | } | |
2950 | break; | |
2951 | default: | |
2952 | abort(); | |
2953 | } | |
2954 | } | |
2955 | } | |
2956 | ||
2957 | /* Tell the remote gdb that the process has exited. */ | |
2958 | void gdb_exit(CPUArchState *env, int code) | |
2959 | { | |
2960 | char buf[4]; | |
2961 | ||
2962 | if (!gdbserver_state.init) { | |
2963 | return; | |
2964 | } | |
2965 | #ifdef CONFIG_USER_ONLY | |
2966 | if (gdbserver_state.socket_path) { | |
2967 | unlink(gdbserver_state.socket_path); | |
2968 | } | |
2969 | if (gdbserver_state.fd < 0) { | |
2970 | return; | |
2971 | } | |
2972 | #endif | |
2973 | ||
2974 | trace_gdbstub_op_exiting((uint8_t)code); | |
2975 | ||
2976 | snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code); | |
2977 | put_packet(buf); | |
2978 | ||
2979 | #ifndef CONFIG_USER_ONLY | |
2980 | qemu_chr_fe_deinit(&gdbserver_state.chr, true); | |
2981 | #endif | |
2982 | } | |
2983 | ||
2984 | /* | |
2985 | * Create the process that will contain all the "orphan" CPUs (that are not | |
2986 | * part of a CPU cluster). Note that if this process contains no CPUs, it won't | |
2987 | * be attachable and thus will be invisible to the user. | |
2988 | */ | |
2989 | static void create_default_process(GDBState *s) | |
2990 | { | |
2991 | GDBProcess *process; | |
2992 | int max_pid = 0; | |
2993 | ||
2994 | if (gdbserver_state.process_num) { | |
2995 | max_pid = s->processes[s->process_num - 1].pid; | |
2996 | } | |
2997 | ||
2998 | s->processes = g_renew(GDBProcess, s->processes, ++s->process_num); | |
2999 | process = &s->processes[s->process_num - 1]; | |
3000 | ||
3001 | /* We need an available PID slot for this process */ | |
3002 | assert(max_pid < UINT32_MAX); | |
3003 | ||
3004 | process->pid = max_pid + 1; | |
3005 | process->attached = false; | |
3006 | process->target_xml[0] = '\0'; | |
3007 | } | |
3008 | ||
3009 | #ifdef CONFIG_USER_ONLY | |
3010 | int | |
3011 | gdb_handlesig(CPUState *cpu, int sig) | |
3012 | { | |
3013 | char buf[256]; | |
3014 | int n; | |
3015 | ||
3016 | if (!gdbserver_state.init || gdbserver_state.fd < 0) { | |
3017 | return sig; | |
3018 | } | |
3019 | ||
3020 | /* disable single step if it was enabled */ | |
3021 | cpu_single_step(cpu, 0); | |
3022 | tb_flush(cpu); | |
3023 | ||
3024 | if (sig != 0) { | |
3025 | snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb(sig)); | |
3026 | put_packet(buf); | |
3027 | } | |
3028 | /* put_packet() might have detected that the peer terminated the | |
3029 | connection. */ | |
3030 | if (gdbserver_state.fd < 0) { | |
3031 | return sig; | |
3032 | } | |
3033 | ||
3034 | sig = 0; | |
3035 | gdbserver_state.state = RS_IDLE; | |
3036 | gdbserver_state.running_state = 0; | |
3037 | while (gdbserver_state.running_state == 0) { | |
3038 | n = read(gdbserver_state.fd, buf, 256); | |
3039 | if (n > 0) { | |
3040 | int i; | |
3041 | ||
3042 | for (i = 0; i < n; i++) { | |
3043 | gdb_read_byte(buf[i]); | |
3044 | } | |
3045 | } else { | |
3046 | /* XXX: Connection closed. Should probably wait for another | |
3047 | connection before continuing. */ | |
3048 | if (n == 0) { | |
3049 | close(gdbserver_state.fd); | |
3050 | } | |
3051 | gdbserver_state.fd = -1; | |
3052 | return sig; | |
3053 | } | |
3054 | } | |
3055 | sig = gdbserver_state.signal; | |
3056 | gdbserver_state.signal = 0; | |
3057 | return sig; | |
3058 | } | |
3059 | ||
3060 | /* Tell the remote gdb that the process has exited due to SIG. */ | |
3061 | void gdb_signalled(CPUArchState *env, int sig) | |
3062 | { | |
3063 | char buf[4]; | |
3064 | ||
3065 | if (!gdbserver_state.init || gdbserver_state.fd < 0) { | |
3066 | return; | |
3067 | } | |
3068 | ||
3069 | snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb(sig)); | |
3070 | put_packet(buf); | |
3071 | } | |
3072 | ||
3073 | static void gdb_accept_init(int fd) | |
3074 | { | |
3075 | init_gdbserver_state(); | |
3076 | create_default_process(&gdbserver_state); | |
3077 | gdbserver_state.processes[0].attached = true; | |
3078 | gdbserver_state.c_cpu = gdb_first_attached_cpu(); | |
3079 | gdbserver_state.g_cpu = gdbserver_state.c_cpu; | |
3080 | gdbserver_state.fd = fd; | |
3081 | gdb_has_xml = false; | |
3082 | } | |
3083 | ||
3084 | static bool gdb_accept_socket(int gdb_fd) | |
3085 | { | |
3086 | int fd; | |
3087 | ||
3088 | for(;;) { | |
3089 | fd = accept(gdb_fd, NULL, NULL); | |
3090 | if (fd < 0 && errno != EINTR) { | |
3091 | perror("accept socket"); | |
3092 | return false; | |
3093 | } else if (fd >= 0) { | |
3094 | qemu_set_cloexec(fd); | |
3095 | break; | |
3096 | } | |
3097 | } | |
3098 | ||
3099 | gdb_accept_init(fd); | |
3100 | return true; | |
3101 | } | |
3102 | ||
3103 | static int gdbserver_open_socket(const char *path) | |
3104 | { | |
3105 | struct sockaddr_un sockaddr; | |
3106 | int fd, ret; | |
3107 | ||
3108 | fd = socket(AF_UNIX, SOCK_STREAM, 0); | |
3109 | if (fd < 0) { | |
3110 | perror("create socket"); | |
3111 | return -1; | |
3112 | } | |
3113 | ||
3114 | sockaddr.sun_family = AF_UNIX; | |
3115 | pstrcpy(sockaddr.sun_path, sizeof(sockaddr.sun_path) - 1, path); | |
3116 | ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); | |
3117 | if (ret < 0) { | |
3118 | perror("bind socket"); | |
3119 | close(fd); | |
3120 | return -1; | |
3121 | } | |
3122 | ret = listen(fd, 1); | |
3123 | if (ret < 0) { | |
3124 | perror("listen socket"); | |
3125 | close(fd); | |
3126 | return -1; | |
3127 | } | |
3128 | ||
3129 | return fd; | |
3130 | } | |
3131 | ||
3132 | static bool gdb_accept_tcp(int gdb_fd) | |
3133 | { | |
3134 | struct sockaddr_in sockaddr; | |
3135 | socklen_t len; | |
3136 | int fd; | |
3137 | ||
3138 | for(;;) { | |
3139 | len = sizeof(sockaddr); | |
3140 | fd = accept(gdb_fd, (struct sockaddr *)&sockaddr, &len); | |
3141 | if (fd < 0 && errno != EINTR) { | |
3142 | perror("accept"); | |
3143 | return false; | |
3144 | } else if (fd >= 0) { | |
3145 | qemu_set_cloexec(fd); | |
3146 | break; | |
3147 | } | |
3148 | } | |
3149 | ||
3150 | /* set short latency */ | |
3151 | if (socket_set_nodelay(fd)) { | |
3152 | perror("setsockopt"); | |
3153 | close(fd); | |
3154 | return false; | |
3155 | } | |
3156 | ||
3157 | gdb_accept_init(fd); | |
3158 | return true; | |
3159 | } | |
3160 | ||
3161 | static int gdbserver_open_port(int port) | |
3162 | { | |
3163 | struct sockaddr_in sockaddr; | |
3164 | int fd, ret; | |
3165 | ||
3166 | fd = socket(PF_INET, SOCK_STREAM, 0); | |
3167 | if (fd < 0) { | |
3168 | perror("socket"); | |
3169 | return -1; | |
3170 | } | |
3171 | qemu_set_cloexec(fd); | |
3172 | ||
3173 | socket_set_fast_reuse(fd); | |
3174 | ||
3175 | sockaddr.sin_family = AF_INET; | |
3176 | sockaddr.sin_port = htons(port); | |
3177 | sockaddr.sin_addr.s_addr = 0; | |
3178 | ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); | |
3179 | if (ret < 0) { | |
3180 | perror("bind"); | |
3181 | close(fd); | |
3182 | return -1; | |
3183 | } | |
3184 | ret = listen(fd, 1); | |
3185 | if (ret < 0) { | |
3186 | perror("listen"); | |
3187 | close(fd); | |
3188 | return -1; | |
3189 | } | |
3190 | ||
3191 | return fd; | |
3192 | } | |
3193 | ||
3194 | int gdbserver_start(const char *port_or_path) | |
3195 | { | |
3196 | int port = g_ascii_strtoull(port_or_path, NULL, 10); | |
3197 | int gdb_fd; | |
3198 | ||
3199 | if (port > 0) { | |
3200 | gdb_fd = gdbserver_open_port(port); | |
3201 | } else { | |
3202 | gdb_fd = gdbserver_open_socket(port_or_path); | |
3203 | } | |
3204 | ||
3205 | if (gdb_fd < 0) { | |
3206 | return -1; | |
3207 | } | |
3208 | ||
3209 | if (port > 0 && gdb_accept_tcp(gdb_fd)) { | |
3210 | return 0; | |
3211 | } else if (gdb_accept_socket(gdb_fd)) { | |
3212 | gdbserver_state.socket_path = g_strdup(port_or_path); | |
3213 | return 0; | |
3214 | } | |
3215 | ||
3216 | /* gone wrong */ | |
3217 | close(gdb_fd); | |
3218 | return -1; | |
3219 | } | |
3220 | ||
3221 | /* Disable gdb stub for child processes. */ | |
3222 | void gdbserver_fork(CPUState *cpu) | |
3223 | { | |
3224 | if (!gdbserver_state.init || gdbserver_state.fd < 0) { | |
3225 | return; | |
3226 | } | |
3227 | close(gdbserver_state.fd); | |
3228 | gdbserver_state.fd = -1; | |
3229 | cpu_breakpoint_remove_all(cpu, BP_GDB); | |
3230 | cpu_watchpoint_remove_all(cpu, BP_GDB); | |
3231 | } | |
3232 | #else | |
3233 | static int gdb_chr_can_receive(void *opaque) | |
3234 | { | |
3235 | /* We can handle an arbitrarily large amount of data. | |
3236 | Pick the maximum packet size, which is as good as anything. */ | |
3237 | return MAX_PACKET_LENGTH; | |
3238 | } | |
3239 | ||
3240 | static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size) | |
3241 | { | |
3242 | int i; | |
3243 | ||
3244 | for (i = 0; i < size; i++) { | |
3245 | gdb_read_byte(buf[i]); | |
3246 | } | |
3247 | } | |
3248 | ||
3249 | static void gdb_chr_event(void *opaque, QEMUChrEvent event) | |
3250 | { | |
3251 | int i; | |
3252 | GDBState *s = (GDBState *) opaque; | |
3253 | ||
3254 | switch (event) { | |
3255 | case CHR_EVENT_OPENED: | |
3256 | /* Start with first process attached, others detached */ | |
3257 | for (i = 0; i < s->process_num; i++) { | |
3258 | s->processes[i].attached = !i; | |
3259 | } | |
3260 | ||
3261 | s->c_cpu = gdb_first_attached_cpu(); | |
3262 | s->g_cpu = s->c_cpu; | |
3263 | ||
3264 | vm_stop(RUN_STATE_PAUSED); | |
3265 | gdb_has_xml = false; | |
3266 | break; | |
3267 | default: | |
3268 | break; | |
3269 | } | |
3270 | } | |
3271 | ||
3272 | static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len) | |
3273 | { | |
3274 | g_autoptr(GString) hex_buf = g_string_new("O"); | |
3275 | memtohex(hex_buf, buf, len); | |
3276 | put_packet(hex_buf->str); | |
3277 | return len; | |
3278 | } | |
3279 | ||
3280 | #ifndef _WIN32 | |
3281 | static void gdb_sigterm_handler(int signal) | |
3282 | { | |
3283 | if (runstate_is_running()) { | |
3284 | vm_stop(RUN_STATE_PAUSED); | |
3285 | } | |
3286 | } | |
3287 | #endif | |
3288 | ||
3289 | static void gdb_monitor_open(Chardev *chr, ChardevBackend *backend, | |
3290 | bool *be_opened, Error **errp) | |
3291 | { | |
3292 | *be_opened = false; | |
3293 | } | |
3294 | ||
3295 | static void char_gdb_class_init(ObjectClass *oc, void *data) | |
3296 | { | |
3297 | ChardevClass *cc = CHARDEV_CLASS(oc); | |
3298 | ||
3299 | cc->internal = true; | |
3300 | cc->open = gdb_monitor_open; | |
3301 | cc->chr_write = gdb_monitor_write; | |
3302 | } | |
3303 | ||
3304 | #define TYPE_CHARDEV_GDB "chardev-gdb" | |
3305 | ||
3306 | static const TypeInfo char_gdb_type_info = { | |
3307 | .name = TYPE_CHARDEV_GDB, | |
3308 | .parent = TYPE_CHARDEV, | |
3309 | .class_init = char_gdb_class_init, | |
3310 | }; | |
3311 | ||
3312 | static int find_cpu_clusters(Object *child, void *opaque) | |
3313 | { | |
3314 | if (object_dynamic_cast(child, TYPE_CPU_CLUSTER)) { | |
3315 | GDBState *s = (GDBState *) opaque; | |
3316 | CPUClusterState *cluster = CPU_CLUSTER(child); | |
3317 | GDBProcess *process; | |
3318 | ||
3319 | s->processes = g_renew(GDBProcess, s->processes, ++s->process_num); | |
3320 | ||
3321 | process = &s->processes[s->process_num - 1]; | |
3322 | ||
3323 | /* | |
3324 | * GDB process IDs -1 and 0 are reserved. To avoid subtle errors at | |
3325 | * runtime, we enforce here that the machine does not use a cluster ID | |
3326 | * that would lead to PID 0. | |
3327 | */ | |
3328 | assert(cluster->cluster_id != UINT32_MAX); | |
3329 | process->pid = cluster->cluster_id + 1; | |
3330 | process->attached = false; | |
3331 | process->target_xml[0] = '\0'; | |
3332 | ||
3333 | return 0; | |
3334 | } | |
3335 | ||
3336 | return object_child_foreach(child, find_cpu_clusters, opaque); | |
3337 | } | |
3338 | ||
3339 | static int pid_order(const void *a, const void *b) | |
3340 | { | |
3341 | GDBProcess *pa = (GDBProcess *) a; | |
3342 | GDBProcess *pb = (GDBProcess *) b; | |
3343 | ||
3344 | if (pa->pid < pb->pid) { | |
3345 | return -1; | |
3346 | } else if (pa->pid > pb->pid) { | |
3347 | return 1; | |
3348 | } else { | |
3349 | return 0; | |
3350 | } | |
3351 | } | |
3352 | ||
3353 | static void create_processes(GDBState *s) | |
3354 | { | |
3355 | object_child_foreach(object_get_root(), find_cpu_clusters, s); | |
3356 | ||
3357 | if (gdbserver_state.processes) { | |
3358 | /* Sort by PID */ | |
3359 | qsort(gdbserver_state.processes, gdbserver_state.process_num, sizeof(gdbserver_state.processes[0]), pid_order); | |
3360 | } | |
3361 | ||
3362 | create_default_process(s); | |
3363 | } | |
3364 | ||
3365 | int gdbserver_start(const char *device) | |
3366 | { | |
3367 | trace_gdbstub_op_start(device); | |
3368 | ||
3369 | char gdbstub_device_name[128]; | |
3370 | Chardev *chr = NULL; | |
3371 | Chardev *mon_chr; | |
3372 | ||
3373 | if (!first_cpu) { | |
3374 | error_report("gdbstub: meaningless to attach gdb to a " | |
3375 | "machine without any CPU."); | |
3376 | return -1; | |
3377 | } | |
3378 | ||
3379 | if (!device) | |
3380 | return -1; | |
3381 | if (strcmp(device, "none") != 0) { | |
3382 | if (strstart(device, "tcp:", NULL)) { | |
3383 | /* enforce required TCP attributes */ | |
3384 | snprintf(gdbstub_device_name, sizeof(gdbstub_device_name), | |
3385 | "%s,nowait,nodelay,server", device); | |
3386 | device = gdbstub_device_name; | |
3387 | } | |
3388 | #ifndef _WIN32 | |
3389 | else if (strcmp(device, "stdio") == 0) { | |
3390 | struct sigaction act; | |
3391 | ||
3392 | memset(&act, 0, sizeof(act)); | |
3393 | act.sa_handler = gdb_sigterm_handler; | |
3394 | sigaction(SIGINT, &act, NULL); | |
3395 | } | |
3396 | #endif | |
3397 | /* | |
3398 | * FIXME: it's a bit weird to allow using a mux chardev here | |
3399 | * and implicitly setup a monitor. We may want to break this. | |
3400 | */ | |
3401 | chr = qemu_chr_new_noreplay("gdb", device, true, NULL); | |
3402 | if (!chr) | |
3403 | return -1; | |
3404 | } | |
3405 | ||
3406 | if (!gdbserver_state.init) { | |
3407 | init_gdbserver_state(); | |
3408 | ||
3409 | qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL); | |
3410 | ||
3411 | /* Initialize a monitor terminal for gdb */ | |
3412 | mon_chr = qemu_chardev_new(NULL, TYPE_CHARDEV_GDB, | |
3413 | NULL, NULL, &error_abort); | |
3414 | monitor_init_hmp(mon_chr, false, &error_abort); | |
3415 | } else { | |
3416 | qemu_chr_fe_deinit(&gdbserver_state.chr, true); | |
3417 | mon_chr = gdbserver_state.mon_chr; | |
3418 | reset_gdbserver_state(); | |
3419 | } | |
3420 | ||
3421 | create_processes(&gdbserver_state); | |
3422 | ||
3423 | if (chr) { | |
3424 | qemu_chr_fe_init(&gdbserver_state.chr, chr, &error_abort); | |
3425 | qemu_chr_fe_set_handlers(&gdbserver_state.chr, gdb_chr_can_receive, | |
3426 | gdb_chr_receive, gdb_chr_event, | |
3427 | NULL, &gdbserver_state, NULL, true); | |
3428 | } | |
3429 | gdbserver_state.state = chr ? RS_IDLE : RS_INACTIVE; | |
3430 | gdbserver_state.mon_chr = mon_chr; | |
3431 | gdbserver_state.current_syscall_cb = NULL; | |
3432 | ||
3433 | return 0; | |
3434 | } | |
3435 | ||
3436 | void gdbserver_cleanup(void) | |
3437 | { | |
3438 | if (gdbserver_state.init) { | |
3439 | put_packet("W00"); | |
3440 | } | |
3441 | } | |
3442 | ||
3443 | static void register_types(void) | |
3444 | { | |
3445 | type_register_static(&char_gdb_type_info); | |
3446 | } | |
3447 | ||
3448 | type_init(register_types); | |
3449 | #endif |