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b4608c04 FB |
1 | /* |
2 | * gdb server stub | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
67b915a5 FB |
20 | #include "vl.h" |
21 | ||
b4608c04 FB |
22 | #include <sys/socket.h> |
23 | #include <netinet/in.h> | |
24 | #include <netinet/tcp.h> | |
25 | #include <signal.h> | |
b4608c04 | 26 | |
4abe615b | 27 | //#define DEBUG_GDB |
b4608c04 | 28 | |
858693c6 FB |
29 | enum RSState { |
30 | RS_IDLE, | |
31 | RS_GETLINE, | |
32 | RS_CHKSUM1, | |
33 | RS_CHKSUM2, | |
34 | }; | |
b4608c04 | 35 | |
858693c6 | 36 | static int gdbserver_fd; |
b4608c04 | 37 | |
858693c6 FB |
38 | typedef struct GDBState { |
39 | enum RSState state; | |
40 | int fd; | |
41 | char line_buf[4096]; | |
42 | int line_buf_index; | |
43 | int line_csum; | |
44 | } GDBState; | |
b4608c04 | 45 | |
858693c6 | 46 | static int get_char(GDBState *s) |
b4608c04 FB |
47 | { |
48 | uint8_t ch; | |
49 | int ret; | |
50 | ||
51 | for(;;) { | |
858693c6 | 52 | ret = read(s->fd, &ch, 1); |
b4608c04 FB |
53 | if (ret < 0) { |
54 | if (errno != EINTR && errno != EAGAIN) | |
55 | return -1; | |
56 | } else if (ret == 0) { | |
57 | return -1; | |
58 | } else { | |
59 | break; | |
60 | } | |
61 | } | |
62 | return ch; | |
63 | } | |
64 | ||
858693c6 | 65 | static void put_buffer(GDBState *s, const uint8_t *buf, int len) |
b4608c04 FB |
66 | { |
67 | int ret; | |
68 | ||
69 | while (len > 0) { | |
858693c6 | 70 | ret = write(s->fd, buf, len); |
b4608c04 FB |
71 | if (ret < 0) { |
72 | if (errno != EINTR && errno != EAGAIN) | |
73 | return; | |
74 | } else { | |
75 | buf += ret; | |
76 | len -= ret; | |
77 | } | |
78 | } | |
79 | } | |
80 | ||
81 | static inline int fromhex(int v) | |
82 | { | |
83 | if (v >= '0' && v <= '9') | |
84 | return v - '0'; | |
85 | else if (v >= 'A' && v <= 'F') | |
86 | return v - 'A' + 10; | |
87 | else if (v >= 'a' && v <= 'f') | |
88 | return v - 'a' + 10; | |
89 | else | |
90 | return 0; | |
91 | } | |
92 | ||
93 | static inline int tohex(int v) | |
94 | { | |
95 | if (v < 10) | |
96 | return v + '0'; | |
97 | else | |
98 | return v - 10 + 'a'; | |
99 | } | |
100 | ||
101 | static void memtohex(char *buf, const uint8_t *mem, int len) | |
102 | { | |
103 | int i, c; | |
104 | char *q; | |
105 | q = buf; | |
106 | for(i = 0; i < len; i++) { | |
107 | c = mem[i]; | |
108 | *q++ = tohex(c >> 4); | |
109 | *q++ = tohex(c & 0xf); | |
110 | } | |
111 | *q = '\0'; | |
112 | } | |
113 | ||
114 | static void hextomem(uint8_t *mem, const char *buf, int len) | |
115 | { | |
116 | int i; | |
117 | ||
118 | for(i = 0; i < len; i++) { | |
119 | mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]); | |
120 | buf += 2; | |
121 | } | |
122 | } | |
123 | ||
b4608c04 | 124 | /* return -1 if error, 0 if OK */ |
858693c6 | 125 | static int put_packet(GDBState *s, char *buf) |
b4608c04 FB |
126 | { |
127 | char buf1[3]; | |
128 | int len, csum, ch, i; | |
129 | ||
130 | #ifdef DEBUG_GDB | |
131 | printf("reply='%s'\n", buf); | |
132 | #endif | |
133 | ||
134 | for(;;) { | |
135 | buf1[0] = '$'; | |
858693c6 | 136 | put_buffer(s, buf1, 1); |
b4608c04 | 137 | len = strlen(buf); |
858693c6 | 138 | put_buffer(s, buf, len); |
b4608c04 FB |
139 | csum = 0; |
140 | for(i = 0; i < len; i++) { | |
141 | csum += buf[i]; | |
142 | } | |
143 | buf1[0] = '#'; | |
144 | buf1[1] = tohex((csum >> 4) & 0xf); | |
145 | buf1[2] = tohex((csum) & 0xf); | |
146 | ||
858693c6 | 147 | put_buffer(s, buf1, 3); |
b4608c04 | 148 | |
858693c6 | 149 | ch = get_char(s); |
b4608c04 FB |
150 | if (ch < 0) |
151 | return -1; | |
152 | if (ch == '+') | |
153 | break; | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
6da41eaf FB |
158 | #if defined(TARGET_I386) |
159 | ||
160 | static void to_le32(uint8_t *p, int v) | |
161 | { | |
162 | p[0] = v; | |
163 | p[1] = v >> 8; | |
164 | p[2] = v >> 16; | |
165 | p[3] = v >> 24; | |
166 | } | |
167 | ||
168 | static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) | |
169 | { | |
170 | int i, fpus; | |
171 | ||
172 | for(i = 0; i < 8; i++) { | |
173 | to_le32(mem_buf + i * 4, env->regs[i]); | |
174 | } | |
175 | to_le32(mem_buf + 8 * 4, env->eip); | |
176 | to_le32(mem_buf + 9 * 4, env->eflags); | |
177 | to_le32(mem_buf + 10 * 4, env->segs[R_CS].selector); | |
178 | to_le32(mem_buf + 11 * 4, env->segs[R_SS].selector); | |
179 | to_le32(mem_buf + 12 * 4, env->segs[R_DS].selector); | |
180 | to_le32(mem_buf + 13 * 4, env->segs[R_ES].selector); | |
181 | to_le32(mem_buf + 14 * 4, env->segs[R_FS].selector); | |
182 | to_le32(mem_buf + 15 * 4, env->segs[R_GS].selector); | |
183 | /* XXX: convert floats */ | |
184 | for(i = 0; i < 8; i++) { | |
185 | memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10); | |
186 | } | |
187 | to_le32(mem_buf + 36 * 4, env->fpuc); | |
188 | fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11; | |
189 | to_le32(mem_buf + 37 * 4, fpus); | |
190 | to_le32(mem_buf + 38 * 4, 0); /* XXX: convert tags */ | |
191 | to_le32(mem_buf + 39 * 4, 0); /* fiseg */ | |
192 | to_le32(mem_buf + 40 * 4, 0); /* fioff */ | |
193 | to_le32(mem_buf + 41 * 4, 0); /* foseg */ | |
194 | to_le32(mem_buf + 42 * 4, 0); /* fooff */ | |
195 | to_le32(mem_buf + 43 * 4, 0); /* fop */ | |
196 | return 44 * 4; | |
197 | } | |
198 | ||
199 | static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) | |
200 | { | |
201 | uint32_t *registers = (uint32_t *)mem_buf; | |
202 | int i; | |
203 | ||
204 | for(i = 0; i < 8; i++) { | |
205 | env->regs[i] = tswapl(registers[i]); | |
206 | } | |
207 | env->eip = registers[8]; | |
208 | env->eflags = registers[9]; | |
209 | #if defined(CONFIG_USER_ONLY) | |
210 | #define LOAD_SEG(index, sreg)\ | |
211 | if (tswapl(registers[index]) != env->segs[sreg].selector)\ | |
212 | cpu_x86_load_seg(env, sreg, tswapl(registers[index])); | |
213 | LOAD_SEG(10, R_CS); | |
214 | LOAD_SEG(11, R_SS); | |
215 | LOAD_SEG(12, R_DS); | |
216 | LOAD_SEG(13, R_ES); | |
217 | LOAD_SEG(14, R_FS); | |
218 | LOAD_SEG(15, R_GS); | |
219 | #endif | |
220 | } | |
221 | ||
9e62fd7f FB |
222 | #elif defined (TARGET_PPC) |
223 | static void to_le32(uint8_t *p, int v) | |
224 | { | |
225 | p[3] = v; | |
226 | p[2] = v >> 8; | |
227 | p[1] = v >> 16; | |
228 | p[0] = v >> 24; | |
229 | } | |
230 | ||
231 | static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) | |
232 | { | |
233 | uint32_t tmp; | |
234 | int i; | |
235 | ||
236 | /* fill in gprs */ | |
237 | for(i = 0; i < 8; i++) { | |
238 | to_le32(mem_buf + i * 4, env->gpr[i]); | |
239 | } | |
240 | /* fill in fprs */ | |
241 | for (i = 0; i < 32; i++) { | |
242 | to_le32(mem_buf + (i * 2) + 32, *((uint32_t *)&env->fpr[i])); | |
243 | to_le32(mem_buf + (i * 2) + 33, *((uint32_t *)&env->fpr[i] + 1)); | |
244 | } | |
245 | /* nip, msr, ccr, lnk, ctr, xer, mq */ | |
246 | to_le32(mem_buf + 96, tswapl(env->nip)); | |
247 | to_le32(mem_buf + 97, tswapl(_load_msr())); | |
248 | to_le32(mem_buf + 98, 0); | |
249 | tmp = 0; | |
250 | for (i = 0; i < 8; i++) | |
251 | tmp |= env->crf[i] << (32 - (i * 4)); | |
252 | to_le32(mem_buf + 98, tmp); | |
253 | to_le32(mem_buf + 99, tswapl(env->lr)); | |
254 | to_le32(mem_buf + 100, tswapl(env->ctr)); | |
255 | to_le32(mem_buf + 101, tswapl(_load_xer())); | |
256 | to_le32(mem_buf + 102, 0); | |
257 | ||
258 | return 102; | |
259 | } | |
260 | ||
261 | static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) | |
262 | { | |
263 | uint32_t *registers = (uint32_t *)mem_buf; | |
264 | int i; | |
265 | ||
266 | /* fill in gprs */ | |
267 | for (i = 0; i < 32; i++) { | |
268 | env->gpr[i] = tswapl(registers[i]); | |
269 | } | |
270 | /* fill in fprs */ | |
271 | for (i = 0; i < 32; i++) { | |
272 | *((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]); | |
273 | *((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]); | |
274 | } | |
275 | /* nip, msr, ccr, lnk, ctr, xer, mq */ | |
276 | env->nip = tswapl(registers[96]); | |
277 | _store_msr(tswapl(registers[97])); | |
278 | registers[98] = tswapl(registers[98]); | |
279 | for (i = 0; i < 8; i++) | |
280 | env->crf[i] = (registers[98] >> (32 - (i * 4))) & 0xF; | |
281 | env->lr = tswapl(registers[99]); | |
282 | env->ctr = tswapl(registers[100]); | |
283 | _store_xer(tswapl(registers[101])); | |
284 | } | |
6da41eaf FB |
285 | #else |
286 | ||
287 | static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf) | |
288 | { | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size) | |
293 | { | |
294 | } | |
295 | ||
296 | #endif | |
b4608c04 FB |
297 | |
298 | /* port = 0 means default port */ | |
858693c6 | 299 | static int gdb_handle_packet(GDBState *s, const char *line_buf) |
b4608c04 | 300 | { |
858693c6 | 301 | CPUState *env = cpu_single_env; |
b4608c04 | 302 | const char *p; |
858693c6 | 303 | int ch, reg_size, type; |
b4608c04 FB |
304 | char buf[4096]; |
305 | uint8_t mem_buf[2000]; | |
306 | uint32_t *registers; | |
307 | uint32_t addr, len; | |
308 | ||
858693c6 FB |
309 | #ifdef DEBUG_GDB |
310 | printf("command='%s'\n", line_buf); | |
311 | #endif | |
312 | p = line_buf; | |
313 | ch = *p++; | |
314 | switch(ch) { | |
315 | case '?': | |
316 | snprintf(buf, sizeof(buf), "S%02x", SIGTRAP); | |
317 | put_packet(s, buf); | |
318 | break; | |
319 | case 'c': | |
320 | if (*p != '\0') { | |
321 | addr = strtoul(p, (char **)&p, 16); | |
4c3a88a2 | 322 | #if defined(TARGET_I386) |
858693c6 | 323 | env->eip = addr; |
5be1a8e0 | 324 | #elif defined (TARGET_PPC) |
858693c6 | 325 | env->nip = addr; |
4c3a88a2 | 326 | #endif |
858693c6 FB |
327 | } |
328 | vm_start(); | |
329 | break; | |
330 | case 's': | |
331 | if (*p != '\0') { | |
332 | addr = strtoul(p, (char **)&p, 16); | |
c33a346e | 333 | #if defined(TARGET_I386) |
858693c6 | 334 | env->eip = addr; |
5be1a8e0 | 335 | #elif defined (TARGET_PPC) |
858693c6 | 336 | env->nip = addr; |
c33a346e | 337 | #endif |
858693c6 FB |
338 | } |
339 | cpu_single_step(env, 1); | |
340 | vm_start(); | |
341 | break; | |
342 | case 'g': | |
343 | reg_size = cpu_gdb_read_registers(env, mem_buf); | |
344 | memtohex(buf, mem_buf, reg_size); | |
345 | put_packet(s, buf); | |
346 | break; | |
347 | case 'G': | |
348 | registers = (void *)mem_buf; | |
349 | len = strlen(p) / 2; | |
350 | hextomem((uint8_t *)registers, p, len); | |
351 | cpu_gdb_write_registers(env, mem_buf, len); | |
352 | put_packet(s, "OK"); | |
353 | break; | |
354 | case 'm': | |
355 | addr = strtoul(p, (char **)&p, 16); | |
356 | if (*p == ',') | |
357 | p++; | |
358 | len = strtoul(p, NULL, 16); | |
359 | if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) | |
360 | memset(mem_buf, 0, len); | |
361 | memtohex(buf, mem_buf, len); | |
362 | put_packet(s, buf); | |
363 | break; | |
364 | case 'M': | |
365 | addr = strtoul(p, (char **)&p, 16); | |
366 | if (*p == ',') | |
367 | p++; | |
368 | len = strtoul(p, (char **)&p, 16); | |
369 | if (*p == ',') | |
370 | p++; | |
371 | hextomem(mem_buf, p, len); | |
372 | if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0) | |
373 | put_packet(s, "ENN"); | |
374 | else | |
375 | put_packet(s, "OK"); | |
376 | break; | |
377 | case 'Z': | |
378 | type = strtoul(p, (char **)&p, 16); | |
379 | if (*p == ',') | |
380 | p++; | |
381 | addr = strtoul(p, (char **)&p, 16); | |
382 | if (*p == ',') | |
383 | p++; | |
384 | len = strtoul(p, (char **)&p, 16); | |
385 | if (type == 0 || type == 1) { | |
386 | if (cpu_breakpoint_insert(env, addr) < 0) | |
387 | goto breakpoint_error; | |
388 | put_packet(s, "OK"); | |
389 | } else { | |
390 | breakpoint_error: | |
391 | put_packet(s, "ENN"); | |
392 | } | |
393 | break; | |
394 | case 'z': | |
395 | type = strtoul(p, (char **)&p, 16); | |
396 | if (*p == ',') | |
397 | p++; | |
398 | addr = strtoul(p, (char **)&p, 16); | |
399 | if (*p == ',') | |
400 | p++; | |
401 | len = strtoul(p, (char **)&p, 16); | |
402 | if (type == 0 || type == 1) { | |
403 | cpu_breakpoint_remove(env, addr); | |
404 | put_packet(s, "OK"); | |
405 | } else { | |
406 | goto breakpoint_error; | |
407 | } | |
408 | break; | |
409 | default: | |
410 | // unknown_command: | |
411 | /* put empty packet */ | |
412 | buf[0] = '\0'; | |
413 | put_packet(s, buf); | |
414 | break; | |
415 | } | |
416 | return RS_IDLE; | |
417 | } | |
418 | ||
419 | static void gdb_vm_stopped(void *opaque, int reason) | |
420 | { | |
421 | GDBState *s = opaque; | |
422 | char buf[256]; | |
423 | int ret; | |
424 | ||
425 | /* disable single step if it was enable */ | |
426 | cpu_single_step(cpu_single_env, 0); | |
427 | ||
428 | if (reason == EXCP_DEBUG) | |
429 | ret = SIGTRAP; | |
430 | else | |
431 | ret = 0; | |
432 | snprintf(buf, sizeof(buf), "S%02x", ret); | |
433 | put_packet(s, buf); | |
434 | } | |
435 | ||
436 | static void gdb_read_byte(GDBState *s, int ch) | |
437 | { | |
438 | int i, csum; | |
439 | char reply[1]; | |
440 | ||
441 | if (vm_running) { | |
442 | /* when the CPU is running, we cannot do anything except stop | |
443 | it when receiving a char */ | |
444 | vm_stop(EXCP_INTERRUPT); | |
445 | } else { | |
446 | switch(s->state) { | |
447 | case RS_IDLE: | |
448 | if (ch == '$') { | |
449 | s->line_buf_index = 0; | |
450 | s->state = RS_GETLINE; | |
c33a346e | 451 | } |
b4608c04 | 452 | break; |
858693c6 FB |
453 | case RS_GETLINE: |
454 | if (ch == '#') { | |
455 | s->state = RS_CHKSUM1; | |
456 | } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { | |
457 | s->state = RS_IDLE; | |
4c3a88a2 | 458 | } else { |
858693c6 | 459 | s->line_buf[s->line_buf_index++] = ch; |
4c3a88a2 FB |
460 | } |
461 | break; | |
858693c6 FB |
462 | case RS_CHKSUM1: |
463 | s->line_buf[s->line_buf_index] = '\0'; | |
464 | s->line_csum = fromhex(ch) << 4; | |
465 | s->state = RS_CHKSUM2; | |
466 | break; | |
467 | case RS_CHKSUM2: | |
468 | s->line_csum |= fromhex(ch); | |
469 | csum = 0; | |
470 | for(i = 0; i < s->line_buf_index; i++) { | |
471 | csum += s->line_buf[i]; | |
472 | } | |
473 | if (s->line_csum != (csum & 0xff)) { | |
474 | reply[0] = '-'; | |
475 | put_buffer(s, reply, 1); | |
476 | s->state = RS_IDLE; | |
4c3a88a2 | 477 | } else { |
858693c6 FB |
478 | reply[0] = '+'; |
479 | put_buffer(s, reply, 1); | |
480 | s->state = gdb_handle_packet(s, s->line_buf); | |
4c3a88a2 FB |
481 | } |
482 | break; | |
858693c6 FB |
483 | } |
484 | } | |
485 | } | |
486 | ||
487 | static int gdb_can_read(void *opaque) | |
488 | { | |
489 | return 256; | |
490 | } | |
491 | ||
492 | static void gdb_read(void *opaque, const uint8_t *buf, int size) | |
493 | { | |
494 | GDBState *s = opaque; | |
495 | int i; | |
496 | if (size == 0) { | |
497 | /* end of connection */ | |
498 | qemu_del_vm_stop_handler(gdb_vm_stopped, s); | |
499 | qemu_del_fd_read_handler(s->fd); | |
500 | qemu_free(s); | |
501 | vm_start(); | |
502 | } else { | |
503 | for(i = 0; i < size; i++) | |
504 | gdb_read_byte(s, buf[i]); | |
505 | } | |
506 | } | |
507 | ||
508 | static void gdb_accept(void *opaque, const uint8_t *buf, int size) | |
509 | { | |
510 | GDBState *s; | |
511 | struct sockaddr_in sockaddr; | |
512 | socklen_t len; | |
513 | int val, fd; | |
514 | ||
515 | for(;;) { | |
516 | len = sizeof(sockaddr); | |
517 | fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len); | |
518 | if (fd < 0 && errno != EINTR) { | |
519 | perror("accept"); | |
520 | return; | |
521 | } else if (fd >= 0) { | |
b4608c04 FB |
522 | break; |
523 | } | |
524 | } | |
858693c6 FB |
525 | |
526 | /* set short latency */ | |
527 | val = 1; | |
528 | setsockopt(fd, SOL_TCP, TCP_NODELAY, &val, sizeof(val)); | |
529 | ||
530 | s = qemu_mallocz(sizeof(GDBState)); | |
531 | if (!s) { | |
532 | close(fd); | |
533 | return; | |
534 | } | |
535 | s->fd = fd; | |
536 | ||
537 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
538 | ||
539 | /* stop the VM */ | |
540 | vm_stop(EXCP_INTERRUPT); | |
541 | ||
542 | /* start handling I/O */ | |
543 | qemu_add_fd_read_handler(s->fd, gdb_can_read, gdb_read, s); | |
544 | /* when the VM is stopped, the following callback is called */ | |
545 | qemu_add_vm_stop_handler(gdb_vm_stopped, s); | |
546 | } | |
547 | ||
548 | static int gdbserver_open(int port) | |
549 | { | |
550 | struct sockaddr_in sockaddr; | |
551 | int fd, val, ret; | |
552 | ||
553 | fd = socket(PF_INET, SOCK_STREAM, 0); | |
554 | if (fd < 0) { | |
555 | perror("socket"); | |
556 | return -1; | |
557 | } | |
558 | ||
559 | /* allow fast reuse */ | |
560 | val = 1; | |
561 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)); | |
562 | ||
563 | sockaddr.sin_family = AF_INET; | |
564 | sockaddr.sin_port = htons(port); | |
565 | sockaddr.sin_addr.s_addr = 0; | |
566 | ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); | |
567 | if (ret < 0) { | |
568 | perror("bind"); | |
569 | return -1; | |
570 | } | |
571 | ret = listen(fd, 0); | |
572 | if (ret < 0) { | |
573 | perror("listen"); | |
574 | return -1; | |
575 | } | |
576 | fcntl(fd, F_SETFL, O_NONBLOCK); | |
577 | return fd; | |
578 | } | |
579 | ||
580 | int gdbserver_start(int port) | |
581 | { | |
582 | gdbserver_fd = gdbserver_open(port); | |
583 | if (gdbserver_fd < 0) | |
584 | return -1; | |
585 | /* accept connections */ | |
586 | qemu_add_fd_read_handler(gdbserver_fd, NULL, gdb_accept, NULL); | |
b4608c04 FB |
587 | return 0; |
588 | } |