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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 <sys/types.h> | |
22 | #include <sys/time.h> | |
23 | #include <sys/resource.h> | |
24 | #include <sys/sysctl.h> | |
25 | ||
26 | #include "qemu/osdep.h" | |
27 | #include "qemu-common.h" | |
28 | #include "qemu/units.h" | |
29 | #include "qemu/accel.h" | |
30 | #include "sysemu/tcg.h" | |
31 | #include "qemu-version.h" | |
32 | #include <machine/trap.h> | |
33 | ||
34 | #include "qapi/error.h" | |
35 | #include "qemu.h" | |
36 | #include "qemu/config-file.h" | |
37 | #include "qemu/error-report.h" | |
38 | #include "qemu/path.h" | |
39 | #include "qemu/help_option.h" | |
40 | #include "qemu/module.h" | |
41 | #include "exec/exec-all.h" | |
42 | #include "tcg/tcg.h" | |
43 | #include "qemu/timer.h" | |
44 | #include "qemu/envlist.h" | |
45 | #include "qemu/cutils.h" | |
46 | #include "exec/log.h" | |
47 | #include "trace/control.h" | |
48 | #include "crypto/init.h" | |
49 | #include "qemu/guest-random.h" | |
50 | ||
51 | #include "host-os.h" | |
52 | #include "target_arch_cpu.h" | |
53 | ||
54 | int singlestep; | |
55 | uintptr_t guest_base; | |
56 | bool have_guest_base; | |
57 | /* | |
58 | * When running 32-on-64 we should make sure we can fit all of the possible | |
59 | * guest address space into a contiguous chunk of virtual host memory. | |
60 | * | |
61 | * This way we will never overlap with our own libraries or binaries or stack | |
62 | * or anything else that QEMU maps. | |
63 | * | |
64 | * Many cpus reserve the high bit (or more than one for some 64-bit cpus) | |
65 | * of the address for the kernel. Some cpus rely on this and user space | |
66 | * uses the high bit(s) for pointer tagging and the like. For them, we | |
67 | * must preserve the expected address space. | |
68 | */ | |
69 | #ifndef MAX_RESERVED_VA | |
70 | # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS | |
71 | # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \ | |
72 | (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32)) | |
73 | /* | |
74 | * There are a number of places where we assign reserved_va to a variable | |
75 | * of type abi_ulong and expect it to fit. Avoid the last page. | |
76 | */ | |
77 | # define MAX_RESERVED_VA (0xfffffffful & TARGET_PAGE_MASK) | |
78 | # else | |
79 | # define MAX_RESERVED_VA (1ul << TARGET_VIRT_ADDR_SPACE_BITS) | |
80 | # endif | |
81 | # else | |
82 | # define MAX_RESERVED_VA 0 | |
83 | # endif | |
84 | #endif | |
85 | ||
86 | /* | |
87 | * That said, reserving *too* much vm space via mmap can run into problems | |
88 | * with rlimits, oom due to page table creation, etc. We will still try it, | |
89 | * if directed by the command-line option, but not by default. | |
90 | */ | |
91 | #if HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32 | |
92 | unsigned long reserved_va = MAX_RESERVED_VA; | |
93 | #else | |
94 | unsigned long reserved_va; | |
95 | #endif | |
96 | ||
97 | static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; | |
98 | const char *qemu_uname_release; | |
99 | enum BSDType bsd_type; | |
100 | char qemu_proc_pathname[PATH_MAX]; /* full path to exeutable */ | |
101 | ||
102 | unsigned long target_maxtsiz = TARGET_MAXTSIZ; /* max text size */ | |
103 | unsigned long target_dfldsiz = TARGET_DFLDSIZ; /* initial data size limit */ | |
104 | unsigned long target_maxdsiz = TARGET_MAXDSIZ; /* max data size */ | |
105 | unsigned long target_dflssiz = TARGET_DFLSSIZ; /* initial data size limit */ | |
106 | unsigned long target_maxssiz = TARGET_MAXSSIZ; /* max stack size */ | |
107 | unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */ | |
108 | ||
109 | /* Helper routines for implementing atomic operations. */ | |
110 | ||
111 | void fork_start(void) | |
112 | { | |
113 | start_exclusive(); | |
114 | cpu_list_lock(); | |
115 | mmap_fork_start(); | |
116 | } | |
117 | ||
118 | void fork_end(int child) | |
119 | { | |
120 | if (child) { | |
121 | CPUState *cpu, *next_cpu; | |
122 | /* | |
123 | * Child processes created by fork() only have a single thread. Discard | |
124 | * information about the parent threads. | |
125 | */ | |
126 | CPU_FOREACH_SAFE(cpu, next_cpu) { | |
127 | if (cpu != thread_cpu) { | |
128 | QTAILQ_REMOVE_RCU(&cpus, cpu, node); | |
129 | } | |
130 | } | |
131 | mmap_fork_end(child); | |
132 | /* | |
133 | * qemu_init_cpu_list() takes care of reinitializing the exclusive | |
134 | * state, so we don't need to end_exclusive() here. | |
135 | */ | |
136 | qemu_init_cpu_list(); | |
137 | gdbserver_fork(thread_cpu); | |
138 | } else { | |
139 | mmap_fork_end(child); | |
140 | cpu_list_unlock(); | |
141 | end_exclusive(); | |
142 | } | |
143 | } | |
144 | ||
145 | void cpu_loop(CPUArchState *env) | |
146 | { | |
147 | target_cpu_loop(env); | |
148 | } | |
149 | ||
150 | static void usage(void) | |
151 | { | |
152 | printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION | |
153 | "\n" QEMU_COPYRIGHT "\n" | |
154 | "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" | |
155 | "BSD CPU emulator (compiled for %s emulation)\n" | |
156 | "\n" | |
157 | "Standard options:\n" | |
158 | "-h print this help\n" | |
159 | "-g port wait gdb connection to port\n" | |
160 | "-L path set the elf interpreter prefix (default=%s)\n" | |
161 | "-s size set the stack size in bytes (default=%ld)\n" | |
162 | "-cpu model select CPU (-cpu help for list)\n" | |
163 | "-drop-ld-preload drop LD_PRELOAD for target process\n" | |
164 | "-E var=value sets/modifies targets environment variable(s)\n" | |
165 | "-U var unsets targets environment variable(s)\n" | |
166 | "-B address set guest_base address to address\n" | |
167 | "-bsd type select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n" | |
168 | "\n" | |
169 | "Debug options:\n" | |
170 | "-d item1[,...] enable logging of specified items\n" | |
171 | " (use '-d help' for a list of log items)\n" | |
172 | "-D logfile write logs to 'logfile' (default stderr)\n" | |
173 | "-singlestep always run in singlestep mode\n" | |
174 | "-strace log system calls\n" | |
175 | "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" | |
176 | " specify tracing options\n" | |
177 | "\n" | |
178 | "Environment variables:\n" | |
179 | "QEMU_STRACE Print system calls and arguments similar to the\n" | |
180 | " 'strace' program. Enable by setting to any value.\n" | |
181 | "You can use -E and -U options to set/unset environment variables\n" | |
182 | "for target process. It is possible to provide several variables\n" | |
183 | "by repeating the option. For example:\n" | |
184 | " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" | |
185 | "Note that if you provide several changes to single variable\n" | |
186 | "last change will stay in effect.\n" | |
187 | "\n" | |
188 | QEMU_HELP_BOTTOM "\n" | |
189 | , | |
190 | TARGET_NAME, | |
191 | interp_prefix, | |
192 | target_dflssiz); | |
193 | exit(1); | |
194 | } | |
195 | ||
196 | __thread CPUState *thread_cpu; | |
197 | ||
198 | bool qemu_cpu_is_self(CPUState *cpu) | |
199 | { | |
200 | return thread_cpu == cpu; | |
201 | } | |
202 | ||
203 | void qemu_cpu_kick(CPUState *cpu) | |
204 | { | |
205 | cpu_exit(cpu); | |
206 | } | |
207 | ||
208 | /* Assumes contents are already zeroed. */ | |
209 | void init_task_state(TaskState *ts) | |
210 | { | |
211 | int i; | |
212 | ||
213 | ts->first_free = ts->sigqueue_table; | |
214 | for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) { | |
215 | ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1]; | |
216 | } | |
217 | ts->sigqueue_table[i].next = NULL; | |
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 | bsd_type = HOST_DEFAULT_BSD_TYPE; | |
282 | char *argv0 = NULL; | |
283 | ||
284 | adjust_ssize(); | |
285 | ||
286 | if (argc <= 1) { | |
287 | usage(); | |
288 | } | |
289 | ||
290 | save_proc_pathname(argv[0]); | |
291 | ||
292 | error_init(argv[0]); | |
293 | module_call_init(MODULE_INIT_TRACE); | |
294 | qemu_init_cpu_list(); | |
295 | module_call_init(MODULE_INIT_QOM); | |
296 | ||
297 | envlist = envlist_create(); | |
298 | ||
299 | /* add current environment into the list */ | |
300 | for (wrk = environ; *wrk != NULL; wrk++) { | |
301 | (void) envlist_setenv(envlist, *wrk); | |
302 | } | |
303 | ||
304 | cpu_model = NULL; | |
305 | ||
306 | qemu_add_opts(&qemu_trace_opts); | |
307 | ||
308 | optind = 1; | |
309 | for (;;) { | |
310 | if (optind >= argc) { | |
311 | break; | |
312 | } | |
313 | r = argv[optind]; | |
314 | if (r[0] != '-') { | |
315 | break; | |
316 | } | |
317 | optind++; | |
318 | r++; | |
319 | if (!strcmp(r, "-")) { | |
320 | break; | |
321 | } else if (!strcmp(r, "d")) { | |
322 | if (optind >= argc) { | |
323 | break; | |
324 | } | |
325 | log_mask = argv[optind++]; | |
326 | } else if (!strcmp(r, "D")) { | |
327 | if (optind >= argc) { | |
328 | break; | |
329 | } | |
330 | log_file = argv[optind++]; | |
331 | } else if (!strcmp(r, "E")) { | |
332 | r = argv[optind++]; | |
333 | if (envlist_setenv(envlist, r) != 0) { | |
334 | usage(); | |
335 | } | |
336 | } else if (!strcmp(r, "ignore-environment")) { | |
337 | envlist_free(envlist); | |
338 | envlist = envlist_create(); | |
339 | } else if (!strcmp(r, "U")) { | |
340 | r = argv[optind++]; | |
341 | if (envlist_unsetenv(envlist, r) != 0) { | |
342 | usage(); | |
343 | } | |
344 | } else if (!strcmp(r, "s")) { | |
345 | r = argv[optind++]; | |
346 | rv = qemu_strtoul(r, &r, 0, &target_dflssiz); | |
347 | if (rv < 0 || target_dflssiz <= 0) { | |
348 | usage(); | |
349 | } | |
350 | if (*r == 'M') { | |
351 | target_dflssiz *= 1024 * 1024; | |
352 | } else if (*r == 'k' || *r == 'K') { | |
353 | target_dflssiz *= 1024; | |
354 | } | |
355 | if (target_dflssiz > target_maxssiz) { | |
356 | usage(); | |
357 | } | |
358 | } else if (!strcmp(r, "L")) { | |
359 | interp_prefix = argv[optind++]; | |
360 | } else if (!strcmp(r, "p")) { | |
361 | qemu_host_page_size = atoi(argv[optind++]); | |
362 | if (qemu_host_page_size == 0 || | |
363 | (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { | |
364 | fprintf(stderr, "page size must be a power of two\n"); | |
365 | exit(1); | |
366 | } | |
367 | } else if (!strcmp(r, "g")) { | |
368 | gdbstub = g_strdup(argv[optind++]); | |
369 | } else if (!strcmp(r, "r")) { | |
370 | qemu_uname_release = argv[optind++]; | |
371 | } else if (!strcmp(r, "cpu")) { | |
372 | cpu_model = argv[optind++]; | |
373 | if (is_help_option(cpu_model)) { | |
374 | /* XXX: implement xxx_cpu_list for targets that still miss it */ | |
375 | #if defined(cpu_list) | |
376 | cpu_list(); | |
377 | #endif | |
378 | exit(1); | |
379 | } | |
380 | } else if (!strcmp(r, "B")) { | |
381 | rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); | |
382 | if (rv < 0) { | |
383 | usage(); | |
384 | } | |
385 | have_guest_base = true; | |
386 | } else if (!strcmp(r, "drop-ld-preload")) { | |
387 | (void) envlist_unsetenv(envlist, "LD_PRELOAD"); | |
388 | } else if (!strcmp(r, "bsd")) { | |
389 | if (!strcasecmp(argv[optind], "freebsd")) { | |
390 | bsd_type = target_freebsd; | |
391 | } else if (!strcasecmp(argv[optind], "netbsd")) { | |
392 | bsd_type = target_netbsd; | |
393 | } else if (!strcasecmp(argv[optind], "openbsd")) { | |
394 | bsd_type = target_openbsd; | |
395 | } else { | |
396 | usage(); | |
397 | } | |
398 | optind++; | |
399 | } else if (!strcmp(r, "seed")) { | |
400 | seed_optarg = optarg; | |
401 | } else if (!strcmp(r, "singlestep")) { | |
402 | singlestep = 1; | |
403 | } else if (!strcmp(r, "strace")) { | |
404 | do_strace = 1; | |
405 | } else if (!strcmp(r, "trace")) { | |
406 | trace_opt_parse(optarg); | |
407 | } else if (!strcmp(r, "0")) { | |
408 | argv0 = argv[optind++]; | |
409 | } else { | |
410 | usage(); | |
411 | } | |
412 | } | |
413 | ||
414 | /* init debug */ | |
415 | qemu_log_needs_buffers(); | |
416 | qemu_set_log_filename(log_file, &error_fatal); | |
417 | if (log_mask) { | |
418 | int mask; | |
419 | ||
420 | mask = qemu_str_to_log_mask(log_mask); | |
421 | if (!mask) { | |
422 | qemu_print_log_usage(stdout); | |
423 | exit(1); | |
424 | } | |
425 | qemu_set_log(mask); | |
426 | } | |
427 | ||
428 | if (optind >= argc) { | |
429 | usage(); | |
430 | } | |
431 | filename = argv[optind]; | |
432 | if (argv0) { | |
433 | argv[optind] = argv0; | |
434 | } | |
435 | ||
436 | if (!trace_init_backends()) { | |
437 | exit(1); | |
438 | } | |
439 | trace_init_file(); | |
440 | ||
441 | /* Zero out regs */ | |
442 | memset(regs, 0, sizeof(struct target_pt_regs)); | |
443 | ||
444 | /* Zero bsd params */ | |
445 | memset(&bprm, 0, sizeof(bprm)); | |
446 | ||
447 | /* Zero out image_info */ | |
448 | memset(info, 0, sizeof(struct image_info)); | |
449 | ||
450 | /* Scan interp_prefix dir for replacement files. */ | |
451 | init_paths(interp_prefix); | |
452 | ||
453 | if (cpu_model == NULL) { | |
454 | cpu_model = TARGET_DEFAULT_CPU_MODEL; | |
455 | } | |
456 | ||
457 | cpu_type = parse_cpu_option(cpu_model); | |
458 | ||
459 | /* init tcg before creating CPUs and to get qemu_host_page_size */ | |
460 | { | |
461 | AccelClass *ac = ACCEL_GET_CLASS(current_accel()); | |
462 | ||
463 | accel_init_interfaces(ac); | |
464 | ac->init_machine(NULL); | |
465 | } | |
466 | cpu = cpu_create(cpu_type); | |
467 | env = cpu->env_ptr; | |
468 | cpu_reset(cpu); | |
469 | thread_cpu = cpu; | |
470 | ||
471 | if (getenv("QEMU_STRACE")) { | |
472 | do_strace = 1; | |
473 | } | |
474 | ||
475 | target_environ = envlist_to_environ(envlist, NULL); | |
476 | envlist_free(envlist); | |
477 | ||
478 | if (reserved_va) { | |
479 | mmap_next_start = reserved_va; | |
480 | } | |
481 | ||
482 | { | |
483 | Error *err = NULL; | |
484 | if (seed_optarg != NULL) { | |
485 | qemu_guest_random_seed_main(seed_optarg, &err); | |
486 | } else { | |
487 | qcrypto_init(&err); | |
488 | } | |
489 | if (err) { | |
490 | error_reportf_err(err, "cannot initialize crypto: "); | |
491 | exit(1); | |
492 | } | |
493 | } | |
494 | ||
495 | /* | |
496 | * Now that page sizes are configured we can do | |
497 | * proper page alignment for guest_base. | |
498 | */ | |
499 | guest_base = HOST_PAGE_ALIGN(guest_base); | |
500 | ||
501 | if (loader_exec(filename, argv + optind, target_environ, regs, info, | |
502 | &bprm) != 0) { | |
503 | printf("Error loading %s\n", filename); | |
504 | _exit(1); | |
505 | } | |
506 | ||
507 | for (wrk = target_environ; *wrk; wrk++) { | |
508 | g_free(*wrk); | |
509 | } | |
510 | ||
511 | g_free(target_environ); | |
512 | ||
513 | if (qemu_loglevel_mask(CPU_LOG_PAGE)) { | |
514 | qemu_log("guest_base %p\n", (void *)guest_base); | |
515 | log_page_dump("binary load"); | |
516 | ||
517 | qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk); | |
518 | qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code); | |
519 | qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", | |
520 | info->start_code); | |
521 | qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", | |
522 | info->start_data); | |
523 | qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data); | |
524 | qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", | |
525 | info->start_stack); | |
526 | qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); | |
527 | qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); | |
528 | } | |
529 | ||
530 | /* build Task State */ | |
531 | ts = g_new0(TaskState, 1); | |
532 | init_task_state(ts); | |
533 | ts->info = info; | |
534 | ts->bprm = &bprm; | |
535 | cpu->opaque = ts; | |
536 | ||
537 | target_set_brk(info->brk); | |
538 | syscall_init(); | |
539 | signal_init(); | |
540 | ||
541 | /* | |
542 | * Now that we've loaded the binary, GUEST_BASE is fixed. Delay | |
543 | * generating the prologue until now so that the prologue can take | |
544 | * the real value of GUEST_BASE into account. | |
545 | */ | |
546 | tcg_prologue_init(tcg_ctx); | |
547 | ||
548 | target_cpu_init(env, regs); | |
549 | ||
550 | if (gdbstub) { | |
551 | gdbserver_start(gdbstub); | |
552 | gdb_handlesig(cpu, 0); | |
553 | } | |
554 | cpu_loop(env); | |
555 | /* never exits */ | |
556 | return 0; | |
557 | } |