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1 | /* | |
2 | * qemu bsd user main | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * Copyright (c) 2013-14 Stacey Son | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include "qemu/osdep.h" | |
22 | #include <sys/resource.h> | |
23 | #include <sys/sysctl.h> | |
24 | ||
25 | #include "qemu/help-texts.h" | |
26 | #include "qemu/units.h" | |
27 | #include "qemu/accel.h" | |
28 | #include "qemu-version.h" | |
29 | #include <machine/trap.h> | |
30 | ||
31 | #include "qapi/error.h" | |
32 | #include "qemu.h" | |
33 | #include "qemu/config-file.h" | |
34 | #include "qemu/error-report.h" | |
35 | #include "qemu/path.h" | |
36 | #include "qemu/help_option.h" | |
37 | #include "qemu/module.h" | |
38 | #include "exec/exec-all.h" | |
39 | #include "tcg/tcg.h" | |
40 | #include "qemu/timer.h" | |
41 | #include "qemu/envlist.h" | |
42 | #include "qemu/cutils.h" | |
43 | #include "exec/log.h" | |
44 | #include "trace/control.h" | |
45 | #include "crypto/init.h" | |
46 | #include "qemu/guest-random.h" | |
47 | #include "gdbstub/user.h" | |
48 | ||
49 | #include "host-os.h" | |
50 | #include "target_arch_cpu.h" | |
51 | ||
52 | static bool opt_one_insn_per_tb; | |
53 | uintptr_t guest_base; | |
54 | bool have_guest_base; | |
55 | /* | |
56 | * When running 32-on-64 we should make sure we can fit all of the possible | |
57 | * guest address space into a contiguous chunk of virtual host memory. | |
58 | * | |
59 | * This way we will never overlap with our own libraries or binaries or stack | |
60 | * or anything else that QEMU maps. | |
61 | * | |
62 | * Many cpus reserve the high bit (or more than one for some 64-bit cpus) | |
63 | * of the address for the kernel. Some cpus rely on this and user space | |
64 | * uses the high bit(s) for pointer tagging and the like. For them, we | |
65 | * must preserve the expected address space. | |
66 | */ | |
67 | #ifndef MAX_RESERVED_VA | |
68 | # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS | |
69 | # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \ | |
70 | (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32)) | |
71 | # define MAX_RESERVED_VA 0xfffffffful | |
72 | # else | |
73 | # define MAX_RESERVED_VA ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1) | |
74 | # endif | |
75 | # else | |
76 | # define MAX_RESERVED_VA 0 | |
77 | # endif | |
78 | #endif | |
79 | ||
80 | /* | |
81 | * That said, reserving *too* much vm space via mmap can run into problems | |
82 | * with rlimits, oom due to page table creation, etc. We will still try it, | |
83 | * if directed by the command-line option, but not by default. | |
84 | */ | |
85 | #if HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32 | |
86 | unsigned long reserved_va = MAX_RESERVED_VA; | |
87 | #else | |
88 | unsigned long reserved_va; | |
89 | #endif | |
90 | ||
91 | static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; | |
92 | const char *qemu_uname_release; | |
93 | char qemu_proc_pathname[PATH_MAX]; /* full path to exeutable */ | |
94 | ||
95 | unsigned long target_maxtsiz = TARGET_MAXTSIZ; /* max text size */ | |
96 | unsigned long target_dfldsiz = TARGET_DFLDSIZ; /* initial data size limit */ | |
97 | unsigned long target_maxdsiz = TARGET_MAXDSIZ; /* max data size */ | |
98 | unsigned long target_dflssiz = TARGET_DFLSSIZ; /* initial data size limit */ | |
99 | unsigned long target_maxssiz = TARGET_MAXSSIZ; /* max stack size */ | |
100 | unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */ | |
101 | ||
102 | /* Helper routines for implementing atomic operations. */ | |
103 | ||
104 | void fork_start(void) | |
105 | { | |
106 | start_exclusive(); | |
107 | cpu_list_lock(); | |
108 | mmap_fork_start(); | |
109 | } | |
110 | ||
111 | void fork_end(int child) | |
112 | { | |
113 | if (child) { | |
114 | CPUState *cpu, *next_cpu; | |
115 | /* | |
116 | * Child processes created by fork() only have a single thread. Discard | |
117 | * information about the parent threads. | |
118 | */ | |
119 | CPU_FOREACH_SAFE(cpu, next_cpu) { | |
120 | if (cpu != thread_cpu) { | |
121 | QTAILQ_REMOVE_RCU(&cpus, cpu, node); | |
122 | } | |
123 | } | |
124 | mmap_fork_end(child); | |
125 | /* | |
126 | * qemu_init_cpu_list() takes care of reinitializing the exclusive | |
127 | * state, so we don't need to end_exclusive() here. | |
128 | */ | |
129 | qemu_init_cpu_list(); | |
130 | gdbserver_fork(thread_cpu); | |
131 | } else { | |
132 | mmap_fork_end(child); | |
133 | cpu_list_unlock(); | |
134 | end_exclusive(); | |
135 | } | |
136 | } | |
137 | ||
138 | void cpu_loop(CPUArchState *env) | |
139 | { | |
140 | target_cpu_loop(env); | |
141 | } | |
142 | ||
143 | static void usage(void) | |
144 | { | |
145 | printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION | |
146 | "\n" QEMU_COPYRIGHT "\n" | |
147 | "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" | |
148 | "BSD CPU emulator (compiled for %s emulation)\n" | |
149 | "\n" | |
150 | "Standard options:\n" | |
151 | "-h print this help\n" | |
152 | "-g port wait gdb connection to port\n" | |
153 | "-L path set the elf interpreter prefix (default=%s)\n" | |
154 | "-s size set the stack size in bytes (default=%ld)\n" | |
155 | "-cpu model select CPU (-cpu help for list)\n" | |
156 | "-drop-ld-preload drop LD_PRELOAD for target process\n" | |
157 | "-E var=value sets/modifies targets environment variable(s)\n" | |
158 | "-U var unsets targets environment variable(s)\n" | |
159 | "-B address set guest_base address to address\n" | |
160 | "\n" | |
161 | "Debug options:\n" | |
162 | "-d item1[,...] enable logging of specified items\n" | |
163 | " (use '-d help' for a list of log items)\n" | |
164 | "-D logfile write logs to 'logfile' (default stderr)\n" | |
165 | "-one-insn-per-tb run with one guest instruction per emulated TB\n" | |
166 | "-singlestep deprecated synonym for -one-insn-per-tb\n" | |
167 | "-strace log system calls\n" | |
168 | "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" | |
169 | " specify tracing options\n" | |
170 | "\n" | |
171 | "Environment variables:\n" | |
172 | "QEMU_STRACE Print system calls and arguments similar to the\n" | |
173 | " 'strace' program. Enable by setting to any value.\n" | |
174 | "You can use -E and -U options to set/unset environment variables\n" | |
175 | "for target process. It is possible to provide several variables\n" | |
176 | "by repeating the option. For example:\n" | |
177 | " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" | |
178 | "Note that if you provide several changes to single variable\n" | |
179 | "last change will stay in effect.\n" | |
180 | "\n" | |
181 | QEMU_HELP_BOTTOM "\n" | |
182 | , | |
183 | TARGET_NAME, | |
184 | interp_prefix, | |
185 | target_dflssiz); | |
186 | exit(1); | |
187 | } | |
188 | ||
189 | __thread CPUState *thread_cpu; | |
190 | ||
191 | void stop_all_tasks(void) | |
192 | { | |
193 | /* | |
194 | * We trust when using NPTL (pthreads) start_exclusive() handles thread | |
195 | * stopping correctly. | |
196 | */ | |
197 | start_exclusive(); | |
198 | } | |
199 | ||
200 | bool qemu_cpu_is_self(CPUState *cpu) | |
201 | { | |
202 | return thread_cpu == cpu; | |
203 | } | |
204 | ||
205 | void qemu_cpu_kick(CPUState *cpu) | |
206 | { | |
207 | cpu_exit(cpu); | |
208 | } | |
209 | ||
210 | /* Assumes contents are already zeroed. */ | |
211 | static void init_task_state(TaskState *ts) | |
212 | { | |
213 | ts->sigaltstack_used = (struct target_sigaltstack) { | |
214 | .ss_sp = 0, | |
215 | .ss_size = 0, | |
216 | .ss_flags = TARGET_SS_DISABLE, | |
217 | }; | |
218 | } | |
219 | ||
220 | void gemu_log(const char *fmt, ...) | |
221 | { | |
222 | va_list ap; | |
223 | ||
224 | va_start(ap, fmt); | |
225 | vfprintf(stderr, fmt, ap); | |
226 | va_end(ap); | |
227 | } | |
228 | ||
229 | static void | |
230 | adjust_ssize(void) | |
231 | { | |
232 | struct rlimit rl; | |
233 | ||
234 | if (getrlimit(RLIMIT_STACK, &rl) != 0) { | |
235 | return; | |
236 | } | |
237 | ||
238 | target_maxssiz = MIN(target_maxssiz, rl.rlim_max); | |
239 | target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); | |
240 | ||
241 | rl.rlim_max = target_maxssiz; | |
242 | rl.rlim_cur = target_dflssiz; | |
243 | setrlimit(RLIMIT_STACK, &rl); | |
244 | } | |
245 | ||
246 | static void save_proc_pathname(char *argv0) | |
247 | { | |
248 | int mib[4]; | |
249 | size_t len; | |
250 | ||
251 | mib[0] = CTL_KERN; | |
252 | mib[1] = KERN_PROC; | |
253 | mib[2] = KERN_PROC_PATHNAME; | |
254 | mib[3] = -1; | |
255 | ||
256 | len = sizeof(qemu_proc_pathname); | |
257 | if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) { | |
258 | perror("sysctl"); | |
259 | } | |
260 | } | |
261 | ||
262 | int main(int argc, char **argv) | |
263 | { | |
264 | const char *filename; | |
265 | const char *cpu_model; | |
266 | const char *cpu_type; | |
267 | const char *log_file = NULL; | |
268 | const char *log_mask = NULL; | |
269 | const char *seed_optarg = NULL; | |
270 | struct target_pt_regs regs1, *regs = ®s1; | |
271 | struct image_info info1, *info = &info1; | |
272 | struct bsd_binprm bprm; | |
273 | TaskState *ts; | |
274 | CPUArchState *env; | |
275 | CPUState *cpu; | |
276 | int optind, rv; | |
277 | const char *r; | |
278 | const char *gdbstub = NULL; | |
279 | char **target_environ, **wrk; | |
280 | envlist_t *envlist = NULL; | |
281 | char *argv0 = NULL; | |
282 | ||
283 | adjust_ssize(); | |
284 | ||
285 | if (argc <= 1) { | |
286 | usage(); | |
287 | } | |
288 | ||
289 | save_proc_pathname(argv[0]); | |
290 | ||
291 | error_init(argv[0]); | |
292 | module_call_init(MODULE_INIT_TRACE); | |
293 | qemu_init_cpu_list(); | |
294 | module_call_init(MODULE_INIT_QOM); | |
295 | ||
296 | envlist = envlist_create(); | |
297 | ||
298 | /* | |
299 | * add current environment into the list | |
300 | * envlist_setenv adds to the front of the list; to preserve environ | |
301 | * order add from back to front | |
302 | */ | |
303 | for (wrk = environ; *wrk != NULL; wrk++) { | |
304 | continue; | |
305 | } | |
306 | while (wrk != environ) { | |
307 | wrk--; | |
308 | (void) envlist_setenv(envlist, *wrk); | |
309 | } | |
310 | ||
311 | cpu_model = NULL; | |
312 | ||
313 | qemu_add_opts(&qemu_trace_opts); | |
314 | ||
315 | optind = 1; | |
316 | for (;;) { | |
317 | if (optind >= argc) { | |
318 | break; | |
319 | } | |
320 | r = argv[optind]; | |
321 | if (r[0] != '-') { | |
322 | break; | |
323 | } | |
324 | optind++; | |
325 | r++; | |
326 | if (!strcmp(r, "-")) { | |
327 | break; | |
328 | } else if (!strcmp(r, "d")) { | |
329 | if (optind >= argc) { | |
330 | break; | |
331 | } | |
332 | log_mask = argv[optind++]; | |
333 | } else if (!strcmp(r, "D")) { | |
334 | if (optind >= argc) { | |
335 | break; | |
336 | } | |
337 | log_file = argv[optind++]; | |
338 | } else if (!strcmp(r, "E")) { | |
339 | r = argv[optind++]; | |
340 | if (envlist_setenv(envlist, r) != 0) { | |
341 | usage(); | |
342 | } | |
343 | } else if (!strcmp(r, "ignore-environment")) { | |
344 | envlist_free(envlist); | |
345 | envlist = envlist_create(); | |
346 | } else if (!strcmp(r, "U")) { | |
347 | r = argv[optind++]; | |
348 | if (envlist_unsetenv(envlist, r) != 0) { | |
349 | usage(); | |
350 | } | |
351 | } else if (!strcmp(r, "s")) { | |
352 | r = argv[optind++]; | |
353 | rv = qemu_strtoul(r, &r, 0, &target_dflssiz); | |
354 | if (rv < 0 || target_dflssiz <= 0) { | |
355 | usage(); | |
356 | } | |
357 | if (*r == 'M') { | |
358 | target_dflssiz *= 1024 * 1024; | |
359 | } else if (*r == 'k' || *r == 'K') { | |
360 | target_dflssiz *= 1024; | |
361 | } | |
362 | if (target_dflssiz > target_maxssiz) { | |
363 | usage(); | |
364 | } | |
365 | } else if (!strcmp(r, "L")) { | |
366 | interp_prefix = argv[optind++]; | |
367 | } else if (!strcmp(r, "p")) { | |
368 | qemu_host_page_size = atoi(argv[optind++]); | |
369 | if (qemu_host_page_size == 0 || | |
370 | (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { | |
371 | fprintf(stderr, "page size must be a power of two\n"); | |
372 | exit(1); | |
373 | } | |
374 | } else if (!strcmp(r, "g")) { | |
375 | gdbstub = g_strdup(argv[optind++]); | |
376 | } else if (!strcmp(r, "r")) { | |
377 | qemu_uname_release = argv[optind++]; | |
378 | } else if (!strcmp(r, "cpu")) { | |
379 | cpu_model = argv[optind++]; | |
380 | if (is_help_option(cpu_model)) { | |
381 | /* XXX: implement xxx_cpu_list for targets that still miss it */ | |
382 | #if defined(cpu_list) | |
383 | cpu_list(); | |
384 | #endif | |
385 | exit(1); | |
386 | } | |
387 | } else if (!strcmp(r, "B")) { | |
388 | rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); | |
389 | if (rv < 0) { | |
390 | usage(); | |
391 | } | |
392 | have_guest_base = true; | |
393 | } else if (!strcmp(r, "drop-ld-preload")) { | |
394 | (void) envlist_unsetenv(envlist, "LD_PRELOAD"); | |
395 | } else if (!strcmp(r, "seed")) { | |
396 | seed_optarg = optarg; | |
397 | } else if (!strcmp(r, "singlestep") || !strcmp(r, "one-insn-per-tb")) { | |
398 | opt_one_insn_per_tb = true; | |
399 | } else if (!strcmp(r, "strace")) { | |
400 | do_strace = 1; | |
401 | } else if (!strcmp(r, "trace")) { | |
402 | trace_opt_parse(optarg); | |
403 | } else if (!strcmp(r, "0")) { | |
404 | argv0 = argv[optind++]; | |
405 | } else { | |
406 | usage(); | |
407 | } | |
408 | } | |
409 | ||
410 | /* init debug */ | |
411 | { | |
412 | int mask = 0; | |
413 | if (log_mask) { | |
414 | mask = qemu_str_to_log_mask(log_mask); | |
415 | if (!mask) { | |
416 | qemu_print_log_usage(stdout); | |
417 | exit(1); | |
418 | } | |
419 | } | |
420 | qemu_set_log_filename_flags(log_file, mask, &error_fatal); | |
421 | } | |
422 | ||
423 | if (optind >= argc) { | |
424 | usage(); | |
425 | } | |
426 | filename = argv[optind]; | |
427 | if (argv0) { | |
428 | argv[optind] = argv0; | |
429 | } | |
430 | ||
431 | if (!trace_init_backends()) { | |
432 | exit(1); | |
433 | } | |
434 | trace_init_file(); | |
435 | ||
436 | /* Zero out regs */ | |
437 | memset(regs, 0, sizeof(struct target_pt_regs)); | |
438 | ||
439 | /* Zero bsd params */ | |
440 | memset(&bprm, 0, sizeof(bprm)); | |
441 | ||
442 | /* Zero out image_info */ | |
443 | memset(info, 0, sizeof(struct image_info)); | |
444 | ||
445 | /* Scan interp_prefix dir for replacement files. */ | |
446 | init_paths(interp_prefix); | |
447 | ||
448 | if (cpu_model == NULL) { | |
449 | cpu_model = TARGET_DEFAULT_CPU_MODEL; | |
450 | } | |
451 | ||
452 | cpu_type = parse_cpu_option(cpu_model); | |
453 | ||
454 | /* init tcg before creating CPUs and to get qemu_host_page_size */ | |
455 | { | |
456 | AccelState *accel = current_accel(); | |
457 | AccelClass *ac = ACCEL_GET_CLASS(accel); | |
458 | ||
459 | accel_init_interfaces(ac); | |
460 | object_property_set_bool(OBJECT(accel), "one-insn-per-tb", | |
461 | opt_one_insn_per_tb, &error_abort); | |
462 | ac->init_machine(NULL); | |
463 | } | |
464 | cpu = cpu_create(cpu_type); | |
465 | env = cpu_env(cpu); | |
466 | cpu_reset(cpu); | |
467 | thread_cpu = cpu; | |
468 | ||
469 | if (getenv("QEMU_STRACE")) { | |
470 | do_strace = 1; | |
471 | } | |
472 | ||
473 | target_environ = envlist_to_environ(envlist, NULL); | |
474 | envlist_free(envlist); | |
475 | ||
476 | { | |
477 | Error *err = NULL; | |
478 | if (seed_optarg != NULL) { | |
479 | qemu_guest_random_seed_main(seed_optarg, &err); | |
480 | } else { | |
481 | qcrypto_init(&err); | |
482 | } | |
483 | if (err) { | |
484 | error_reportf_err(err, "cannot initialize crypto: "); | |
485 | exit(1); | |
486 | } | |
487 | } | |
488 | ||
489 | /* | |
490 | * Now that page sizes are configured we can do | |
491 | * proper page alignment for guest_base. | |
492 | */ | |
493 | if (have_guest_base) { | |
494 | if (guest_base & ~qemu_host_page_mask) { | |
495 | error_report("Selected guest base not host page aligned"); | |
496 | exit(1); | |
497 | } | |
498 | } | |
499 | ||
500 | /* | |
501 | * If reserving host virtual address space, do so now. | |
502 | * Combined with '-B', ensure that the chosen range is free. | |
503 | */ | |
504 | if (reserved_va) { | |
505 | void *p; | |
506 | ||
507 | if (have_guest_base) { | |
508 | p = mmap((void *)guest_base, reserved_va + 1, PROT_NONE, | |
509 | MAP_ANON | MAP_PRIVATE | MAP_FIXED | MAP_EXCL, -1, 0); | |
510 | } else { | |
511 | p = mmap(NULL, reserved_va + 1, PROT_NONE, | |
512 | MAP_ANON | MAP_PRIVATE, -1, 0); | |
513 | } | |
514 | if (p == MAP_FAILED) { | |
515 | const char *err = strerror(errno); | |
516 | char *sz = size_to_str(reserved_va + 1); | |
517 | ||
518 | if (have_guest_base) { | |
519 | error_report("Cannot allocate %s bytes at -B %p for guest " | |
520 | "address space: %s", sz, (void *)guest_base, err); | |
521 | } else { | |
522 | error_report("Cannot allocate %s bytes for guest " | |
523 | "address space: %s", sz, err); | |
524 | } | |
525 | exit(1); | |
526 | } | |
527 | guest_base = (uintptr_t)p; | |
528 | have_guest_base = true; | |
529 | ||
530 | /* Ensure that mmap_next_start is within range. */ | |
531 | if (reserved_va <= mmap_next_start) { | |
532 | mmap_next_start = (reserved_va / 4 * 3) | |
533 | & TARGET_PAGE_MASK & qemu_host_page_mask; | |
534 | } | |
535 | } | |
536 | ||
537 | if (loader_exec(filename, argv + optind, target_environ, regs, info, | |
538 | &bprm) != 0) { | |
539 | printf("Error loading %s\n", filename); | |
540 | _exit(1); | |
541 | } | |
542 | ||
543 | for (wrk = target_environ; *wrk; wrk++) { | |
544 | g_free(*wrk); | |
545 | } | |
546 | ||
547 | g_free(target_environ); | |
548 | ||
549 | if (qemu_loglevel_mask(CPU_LOG_PAGE)) { | |
550 | FILE *f = qemu_log_trylock(); | |
551 | if (f) { | |
552 | fprintf(f, "guest_base %p\n", (void *)guest_base); | |
553 | fprintf(f, "page layout changed following binary load\n"); | |
554 | page_dump(f); | |
555 | ||
556 | fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n", | |
557 | info->end_code); | |
558 | fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n", | |
559 | info->start_code); | |
560 | fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n", | |
561 | info->start_data); | |
562 | fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n", | |
563 | info->end_data); | |
564 | fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n", | |
565 | info->start_stack); | |
566 | fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); | |
567 | fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); | |
568 | ||
569 | qemu_log_unlock(f); | |
570 | } | |
571 | } | |
572 | ||
573 | /* build Task State */ | |
574 | ts = g_new0(TaskState, 1); | |
575 | init_task_state(ts); | |
576 | ts->info = info; | |
577 | ts->bprm = &bprm; | |
578 | cpu->opaque = ts; | |
579 | ||
580 | target_set_brk(info->brk); | |
581 | syscall_init(); | |
582 | signal_init(); | |
583 | ||
584 | /* | |
585 | * Now that we've loaded the binary, GUEST_BASE is fixed. Delay | |
586 | * generating the prologue until now so that the prologue can take | |
587 | * the real value of GUEST_BASE into account. | |
588 | */ | |
589 | tcg_prologue_init(tcg_ctx); | |
590 | ||
591 | target_cpu_init(env, regs); | |
592 | ||
593 | if (gdbstub) { | |
594 | gdbserver_start(gdbstub); | |
595 | gdb_handlesig(cpu, 0); | |
596 | } | |
597 | cpu_loop(env); | |
598 | /* never exits */ | |
599 | return 0; | |
600 | } |