1 | /* |
2 | * qemu user main |
3 | * |
4 | * Copyright (c) 2003-2008 Fabrice Bellard |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program 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 |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
18 | */ |
19 | |
20 | #include "qemu/osdep.h" |
21 | #include "qemu-common.h" |
22 | #include "qemu/units.h" |
23 | #include "sysemu/tcg.h" |
24 | #include "qemu-version.h" |
25 | #include <sys/syscall.h> |
26 | #include <sys/resource.h> |
27 | |
28 | #include "qapi/error.h" |
29 | #include "qemu.h" |
30 | #include "qemu/path.h" |
31 | #include "qemu/queue.h" |
32 | #include "qemu/config-file.h" |
33 | #include "qemu/cutils.h" |
34 | #include "qemu/error-report.h" |
35 | #include "qemu/help_option.h" |
36 | #include "qemu/module.h" |
37 | #include "cpu.h" |
38 | #include "exec/exec-all.h" |
39 | #include "tcg.h" |
40 | #include "qemu/timer.h" |
41 | #include "qemu/envlist.h" |
42 | #include "qemu/guest-random.h" |
43 | #include "elf.h" |
44 | #include "trace/control.h" |
45 | #include "target_elf.h" |
46 | #include "cpu_loop-common.h" |
47 | #include "crypto/init.h" |
48 | |
49 | char *exec_path; |
50 | |
51 | int singlestep; |
52 | static const char *filename; |
53 | static const char *argv0; |
54 | static int gdbstub_port; |
55 | static envlist_t *envlist; |
56 | static const char *cpu_model; |
57 | static const char *cpu_type; |
58 | static const char *seed_optarg; |
59 | unsigned long mmap_min_addr; |
60 | unsigned long guest_base; |
61 | int have_guest_base; |
62 | |
63 | /* |
64 | * When running 32-on-64 we should make sure we can fit all of the possible |
65 | * guest address space into a contiguous chunk of virtual host memory. |
66 | * |
67 | * This way we will never overlap with our own libraries or binaries or stack |
68 | * or anything else that QEMU maps. |
69 | * |
70 | * Many cpus reserve the high bit (or more than one for some 64-bit cpus) |
71 | * of the address for the kernel. Some cpus rely on this and user space |
72 | * uses the high bit(s) for pointer tagging and the like. For them, we |
73 | * must preserve the expected address space. |
74 | */ |
75 | #ifndef MAX_RESERVED_VA |
76 | # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS |
77 | # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \ |
78 | (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32)) |
79 | /* There are a number of places where we assign reserved_va to a variable |
80 | of type abi_ulong and expect it to fit. Avoid the last page. */ |
81 | # define MAX_RESERVED_VA (0xfffffffful & TARGET_PAGE_MASK) |
82 | # else |
83 | # define MAX_RESERVED_VA (1ul << TARGET_VIRT_ADDR_SPACE_BITS) |
84 | # endif |
85 | # else |
86 | # define MAX_RESERVED_VA 0 |
87 | # endif |
88 | #endif |
89 | |
90 | unsigned long reserved_va; |
91 | |
92 | static void usage(int exitcode); |
93 | |
94 | static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; |
95 | const char *qemu_uname_release; |
96 | |
97 | /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so |
98 | we allocate a bigger stack. Need a better solution, for example |
99 | by remapping the process stack directly at the right place */ |
100 | unsigned long guest_stack_size = 8 * 1024 * 1024UL; |
101 | |
102 | void gemu_log(const char *fmt, ...) |
103 | { |
104 | va_list ap; |
105 | |
106 | va_start(ap, fmt); |
107 | vfprintf(stderr, fmt, ap); |
108 | va_end(ap); |
109 | } |
110 | |
111 | #if defined(TARGET_I386) |
112 | int cpu_get_pic_interrupt(CPUX86State *env) |
113 | { |
114 | return -1; |
115 | } |
116 | #endif |
117 | |
118 | /***********************************************************/ |
119 | /* Helper routines for implementing atomic operations. */ |
120 | |
121 | /* Make sure everything is in a consistent state for calling fork(). */ |
122 | void fork_start(void) |
123 | { |
124 | start_exclusive(); |
125 | mmap_fork_start(); |
126 | cpu_list_lock(); |
127 | } |
128 | |
129 | void fork_end(int child) |
130 | { |
131 | mmap_fork_end(child); |
132 | if (child) { |
133 | CPUState *cpu, *next_cpu; |
134 | /* Child processes created by fork() only have a single thread. |
135 | Discard information about the parent threads. */ |
136 | CPU_FOREACH_SAFE(cpu, next_cpu) { |
137 | if (cpu != thread_cpu) { |
138 | QTAILQ_REMOVE_RCU(&cpus, cpu, node); |
139 | } |
140 | } |
141 | qemu_init_cpu_list(); |
142 | gdbserver_fork(thread_cpu); |
143 | /* qemu_init_cpu_list() takes care of reinitializing the |
144 | * exclusive state, so we don't need to end_exclusive() here. |
145 | */ |
146 | } else { |
147 | cpu_list_unlock(); |
148 | end_exclusive(); |
149 | } |
150 | } |
151 | |
152 | __thread CPUState *thread_cpu; |
153 | |
154 | bool qemu_cpu_is_self(CPUState *cpu) |
155 | { |
156 | return thread_cpu == cpu; |
157 | } |
158 | |
159 | void qemu_cpu_kick(CPUState *cpu) |
160 | { |
161 | cpu_exit(cpu); |
162 | } |
163 | |
164 | void task_settid(TaskState *ts) |
165 | { |
166 | if (ts->ts_tid == 0) { |
167 | ts->ts_tid = (pid_t)syscall(SYS_gettid); |
168 | } |
169 | } |
170 | |
171 | void stop_all_tasks(void) |
172 | { |
173 | /* |
174 | * We trust that when using NPTL, start_exclusive() |
175 | * handles thread stopping correctly. |
176 | */ |
177 | start_exclusive(); |
178 | } |
179 | |
180 | /* Assumes contents are already zeroed. */ |
181 | void init_task_state(TaskState *ts) |
182 | { |
183 | ts->used = 1; |
184 | ts->sigaltstack_used = (struct target_sigaltstack) { |
185 | .ss_sp = 0, |
186 | .ss_size = 0, |
187 | .ss_flags = TARGET_SS_DISABLE, |
188 | }; |
189 | } |
190 | |
191 | CPUArchState *cpu_copy(CPUArchState *env) |
192 | { |
193 | CPUState *cpu = env_cpu(env); |
194 | CPUState *new_cpu = cpu_create(cpu_type); |
195 | CPUArchState *new_env = new_cpu->env_ptr; |
196 | CPUBreakpoint *bp; |
197 | CPUWatchpoint *wp; |
198 | |
199 | /* Reset non arch specific state */ |
200 | cpu_reset(new_cpu); |
201 | |
202 | memcpy(new_env, env, sizeof(CPUArchState)); |
203 | |
204 | /* Clone all break/watchpoints. |
205 | Note: Once we support ptrace with hw-debug register access, make sure |
206 | BP_CPU break/watchpoints are handled correctly on clone. */ |
207 | QTAILQ_INIT(&new_cpu->breakpoints); |
208 | QTAILQ_INIT(&new_cpu->watchpoints); |
209 | QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) { |
210 | cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL); |
211 | } |
212 | QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) { |
213 | cpu_watchpoint_insert(new_cpu, wp->vaddr, wp->len, wp->flags, NULL); |
214 | } |
215 | |
216 | return new_env; |
217 | } |
218 | |
219 | static void handle_arg_help(const char *arg) |
220 | { |
221 | usage(EXIT_SUCCESS); |
222 | } |
223 | |
224 | static void handle_arg_log(const char *arg) |
225 | { |
226 | int mask; |
227 | |
228 | mask = qemu_str_to_log_mask(arg); |
229 | if (!mask) { |
230 | qemu_print_log_usage(stdout); |
231 | exit(EXIT_FAILURE); |
232 | } |
233 | qemu_log_needs_buffers(); |
234 | qemu_set_log(mask); |
235 | } |
236 | |
237 | static void handle_arg_dfilter(const char *arg) |
238 | { |
239 | qemu_set_dfilter_ranges(arg, NULL); |
240 | } |
241 | |
242 | static void handle_arg_log_filename(const char *arg) |
243 | { |
244 | qemu_set_log_filename(arg, &error_fatal); |
245 | } |
246 | |
247 | static void handle_arg_set_env(const char *arg) |
248 | { |
249 | char *r, *p, *token; |
250 | r = p = strdup(arg); |
251 | while ((token = strsep(&p, "," )) != NULL) { |
252 | if (envlist_setenv(envlist, token) != 0) { |
253 | usage(EXIT_FAILURE); |
254 | } |
255 | } |
256 | free(r); |
257 | } |
258 | |
259 | static void handle_arg_unset_env(const char *arg) |
260 | { |
261 | char *r, *p, *token; |
262 | r = p = strdup(arg); |
263 | while ((token = strsep(&p, "," )) != NULL) { |
264 | if (envlist_unsetenv(envlist, token) != 0) { |
265 | usage(EXIT_FAILURE); |
266 | } |
267 | } |
268 | free(r); |
269 | } |
270 | |
271 | static void handle_arg_argv0(const char *arg) |
272 | { |
273 | argv0 = strdup(arg); |
274 | } |
275 | |
276 | static void handle_arg_stack_size(const char *arg) |
277 | { |
278 | char *p; |
279 | guest_stack_size = strtoul(arg, &p, 0); |
280 | if (guest_stack_size == 0) { |
281 | usage(EXIT_FAILURE); |
282 | } |
283 | |
284 | if (*p == 'M') { |
285 | guest_stack_size *= MiB; |
286 | } else if (*p == 'k' || *p == 'K') { |
287 | guest_stack_size *= KiB; |
288 | } |
289 | } |
290 | |
291 | static void handle_arg_ld_prefix(const char *arg) |
292 | { |
293 | interp_prefix = strdup(arg); |
294 | } |
295 | |
296 | static void handle_arg_pagesize(const char *arg) |
297 | { |
298 | qemu_host_page_size = atoi(arg); |
299 | if (qemu_host_page_size == 0 || |
300 | (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { |
301 | fprintf(stderr, "page size must be a power of two\n" ); |
302 | exit(EXIT_FAILURE); |
303 | } |
304 | } |
305 | |
306 | static void handle_arg_seed(const char *arg) |
307 | { |
308 | seed_optarg = arg; |
309 | } |
310 | |
311 | static void handle_arg_gdb(const char *arg) |
312 | { |
313 | gdbstub_port = atoi(arg); |
314 | } |
315 | |
316 | static void handle_arg_uname(const char *arg) |
317 | { |
318 | qemu_uname_release = strdup(arg); |
319 | } |
320 | |
321 | static void handle_arg_cpu(const char *arg) |
322 | { |
323 | cpu_model = strdup(arg); |
324 | if (cpu_model == NULL || is_help_option(cpu_model)) { |
325 | /* XXX: implement xxx_cpu_list for targets that still miss it */ |
326 | #if defined(cpu_list) |
327 | cpu_list(); |
328 | #endif |
329 | exit(EXIT_FAILURE); |
330 | } |
331 | } |
332 | |
333 | static void handle_arg_guest_base(const char *arg) |
334 | { |
335 | guest_base = strtol(arg, NULL, 0); |
336 | have_guest_base = 1; |
337 | } |
338 | |
339 | static void handle_arg_reserved_va(const char *arg) |
340 | { |
341 | char *p; |
342 | int shift = 0; |
343 | reserved_va = strtoul(arg, &p, 0); |
344 | switch (*p) { |
345 | case 'k': |
346 | case 'K': |
347 | shift = 10; |
348 | break; |
349 | case 'M': |
350 | shift = 20; |
351 | break; |
352 | case 'G': |
353 | shift = 30; |
354 | break; |
355 | } |
356 | if (shift) { |
357 | unsigned long unshifted = reserved_va; |
358 | p++; |
359 | reserved_va <<= shift; |
360 | if (reserved_va >> shift != unshifted |
361 | || (MAX_RESERVED_VA && reserved_va > MAX_RESERVED_VA)) { |
362 | fprintf(stderr, "Reserved virtual address too big\n" ); |
363 | exit(EXIT_FAILURE); |
364 | } |
365 | } |
366 | if (*p) { |
367 | fprintf(stderr, "Unrecognised -R size suffix '%s'\n" , p); |
368 | exit(EXIT_FAILURE); |
369 | } |
370 | } |
371 | |
372 | static void handle_arg_singlestep(const char *arg) |
373 | { |
374 | singlestep = 1; |
375 | } |
376 | |
377 | static void handle_arg_strace(const char *arg) |
378 | { |
379 | do_strace = 1; |
380 | } |
381 | |
382 | static void handle_arg_version(const char *arg) |
383 | { |
384 | printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION |
385 | "\n" QEMU_COPYRIGHT "\n" ); |
386 | exit(EXIT_SUCCESS); |
387 | } |
388 | |
389 | static char *trace_file; |
390 | static void handle_arg_trace(const char *arg) |
391 | { |
392 | g_free(trace_file); |
393 | trace_file = trace_opt_parse(arg); |
394 | } |
395 | |
396 | struct qemu_argument { |
397 | const char *argv; |
398 | const char *env; |
399 | bool has_arg; |
400 | void (*handle_opt)(const char *arg); |
401 | const char *example; |
402 | const char *help; |
403 | }; |
404 | |
405 | static const struct qemu_argument arg_table[] = { |
406 | {"h" , "" , false, handle_arg_help, |
407 | "" , "print this help" }, |
408 | {"help" , "" , false, handle_arg_help, |
409 | "" , "" }, |
410 | {"g" , "QEMU_GDB" , true, handle_arg_gdb, |
411 | "port" , "wait gdb connection to 'port'" }, |
412 | {"L" , "QEMU_LD_PREFIX" , true, handle_arg_ld_prefix, |
413 | "path" , "set the elf interpreter prefix to 'path'" }, |
414 | {"s" , "QEMU_STACK_SIZE" , true, handle_arg_stack_size, |
415 | "size" , "set the stack size to 'size' bytes" }, |
416 | {"cpu" , "QEMU_CPU" , true, handle_arg_cpu, |
417 | "model" , "select CPU (-cpu help for list)" }, |
418 | {"E" , "QEMU_SET_ENV" , true, handle_arg_set_env, |
419 | "var=value" , "sets targets environment variable (see below)" }, |
420 | {"U" , "QEMU_UNSET_ENV" , true, handle_arg_unset_env, |
421 | "var" , "unsets targets environment variable (see below)" }, |
422 | {"0" , "QEMU_ARGV0" , true, handle_arg_argv0, |
423 | "argv0" , "forces target process argv[0] to be 'argv0'" }, |
424 | {"r" , "QEMU_UNAME" , true, handle_arg_uname, |
425 | "uname" , "set qemu uname release string to 'uname'" }, |
426 | {"B" , "QEMU_GUEST_BASE" , true, handle_arg_guest_base, |
427 | "address" , "set guest_base address to 'address'" }, |
428 | {"R" , "QEMU_RESERVED_VA" , true, handle_arg_reserved_va, |
429 | "size" , "reserve 'size' bytes for guest virtual address space" }, |
430 | {"d" , "QEMU_LOG" , true, handle_arg_log, |
431 | "item[,...]" , "enable logging of specified items " |
432 | "(use '-d help' for a list of items)" }, |
433 | {"dfilter" , "QEMU_DFILTER" , true, handle_arg_dfilter, |
434 | "range[,...]" ,"filter logging based on address range" }, |
435 | {"D" , "QEMU_LOG_FILENAME" , true, handle_arg_log_filename, |
436 | "logfile" , "write logs to 'logfile' (default stderr)" }, |
437 | {"p" , "QEMU_PAGESIZE" , true, handle_arg_pagesize, |
438 | "pagesize" , "set the host page size to 'pagesize'" }, |
439 | {"singlestep" , "QEMU_SINGLESTEP" , false, handle_arg_singlestep, |
440 | "" , "run in singlestep mode" }, |
441 | {"strace" , "QEMU_STRACE" , false, handle_arg_strace, |
442 | "" , "log system calls" }, |
443 | {"seed" , "QEMU_RAND_SEED" , true, handle_arg_seed, |
444 | "" , "Seed for pseudo-random number generator" }, |
445 | {"trace" , "QEMU_TRACE" , true, handle_arg_trace, |
446 | "" , "[[enable=]<pattern>][,events=<file>][,file=<file>]" }, |
447 | {"version" , "QEMU_VERSION" , false, handle_arg_version, |
448 | "" , "display version information and exit" }, |
449 | {NULL, NULL, false, NULL, NULL, NULL} |
450 | }; |
451 | |
452 | static void usage(int exitcode) |
453 | { |
454 | const struct qemu_argument *arginfo; |
455 | int maxarglen; |
456 | int maxenvlen; |
457 | |
458 | printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" |
459 | "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n" |
460 | "\n" |
461 | "Options and associated environment variables:\n" |
462 | "\n" ); |
463 | |
464 | /* Calculate column widths. We must always have at least enough space |
465 | * for the column header. |
466 | */ |
467 | maxarglen = strlen("Argument" ); |
468 | maxenvlen = strlen("Env-variable" ); |
469 | |
470 | for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { |
471 | int arglen = strlen(arginfo->argv); |
472 | if (arginfo->has_arg) { |
473 | arglen += strlen(arginfo->example) + 1; |
474 | } |
475 | if (strlen(arginfo->env) > maxenvlen) { |
476 | maxenvlen = strlen(arginfo->env); |
477 | } |
478 | if (arglen > maxarglen) { |
479 | maxarglen = arglen; |
480 | } |
481 | } |
482 | |
483 | printf("%-*s %-*s Description\n" , maxarglen+1, "Argument" , |
484 | maxenvlen, "Env-variable" ); |
485 | |
486 | for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { |
487 | if (arginfo->has_arg) { |
488 | printf("-%s %-*s %-*s %s\n" , arginfo->argv, |
489 | (int)(maxarglen - strlen(arginfo->argv) - 1), |
490 | arginfo->example, maxenvlen, arginfo->env, arginfo->help); |
491 | } else { |
492 | printf("-%-*s %-*s %s\n" , maxarglen, arginfo->argv, |
493 | maxenvlen, arginfo->env, |
494 | arginfo->help); |
495 | } |
496 | } |
497 | |
498 | printf("\n" |
499 | "Defaults:\n" |
500 | "QEMU_LD_PREFIX = %s\n" |
501 | "QEMU_STACK_SIZE = %ld byte\n" , |
502 | interp_prefix, |
503 | guest_stack_size); |
504 | |
505 | printf("\n" |
506 | "You can use -E and -U options or the QEMU_SET_ENV and\n" |
507 | "QEMU_UNSET_ENV environment variables to set and unset\n" |
508 | "environment variables for the target process.\n" |
509 | "It is possible to provide several variables by separating them\n" |
510 | "by commas in getsubopt(3) style. Additionally it is possible to\n" |
511 | "provide the -E and -U options multiple times.\n" |
512 | "The following lines are equivalent:\n" |
513 | " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" |
514 | " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n" |
515 | " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n" |
516 | "Note that if you provide several changes to a single variable\n" |
517 | "the last change will stay in effect.\n" |
518 | "\n" |
519 | QEMU_HELP_BOTTOM "\n" ); |
520 | |
521 | exit(exitcode); |
522 | } |
523 | |
524 | static int parse_args(int argc, char **argv) |
525 | { |
526 | const char *r; |
527 | int optind; |
528 | const struct qemu_argument *arginfo; |
529 | |
530 | for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { |
531 | if (arginfo->env == NULL) { |
532 | continue; |
533 | } |
534 | |
535 | r = getenv(arginfo->env); |
536 | if (r != NULL) { |
537 | arginfo->handle_opt(r); |
538 | } |
539 | } |
540 | |
541 | optind = 1; |
542 | for (;;) { |
543 | if (optind >= argc) { |
544 | break; |
545 | } |
546 | r = argv[optind]; |
547 | if (r[0] != '-') { |
548 | break; |
549 | } |
550 | optind++; |
551 | r++; |
552 | if (!strcmp(r, "-" )) { |
553 | break; |
554 | } |
555 | /* Treat --foo the same as -foo. */ |
556 | if (r[0] == '-') { |
557 | r++; |
558 | } |
559 | |
560 | for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { |
561 | if (!strcmp(r, arginfo->argv)) { |
562 | if (arginfo->has_arg) { |
563 | if (optind >= argc) { |
564 | (void) fprintf(stderr, |
565 | "qemu: missing argument for option '%s'\n" , r); |
566 | exit(EXIT_FAILURE); |
567 | } |
568 | arginfo->handle_opt(argv[optind]); |
569 | optind++; |
570 | } else { |
571 | arginfo->handle_opt(NULL); |
572 | } |
573 | break; |
574 | } |
575 | } |
576 | |
577 | /* no option matched the current argv */ |
578 | if (arginfo->handle_opt == NULL) { |
579 | (void) fprintf(stderr, "qemu: unknown option '%s'\n" , r); |
580 | exit(EXIT_FAILURE); |
581 | } |
582 | } |
583 | |
584 | if (optind >= argc) { |
585 | (void) fprintf(stderr, "qemu: no user program specified\n" ); |
586 | exit(EXIT_FAILURE); |
587 | } |
588 | |
589 | filename = argv[optind]; |
590 | exec_path = argv[optind]; |
591 | |
592 | return optind; |
593 | } |
594 | |
595 | int main(int argc, char **argv, char **envp) |
596 | { |
597 | struct target_pt_regs regs1, *regs = ®s1; |
598 | struct image_info info1, *info = &info1; |
599 | struct linux_binprm bprm; |
600 | TaskState *ts; |
601 | CPUArchState *env; |
602 | CPUState *cpu; |
603 | int optind; |
604 | char **target_environ, **wrk; |
605 | char **target_argv; |
606 | int target_argc; |
607 | int i; |
608 | int ret; |
609 | int execfd; |
610 | |
611 | error_init(argv[0]); |
612 | module_call_init(MODULE_INIT_TRACE); |
613 | qemu_init_cpu_list(); |
614 | module_call_init(MODULE_INIT_QOM); |
615 | |
616 | envlist = envlist_create(); |
617 | |
618 | /* add current environment into the list */ |
619 | for (wrk = environ; *wrk != NULL; wrk++) { |
620 | (void) envlist_setenv(envlist, *wrk); |
621 | } |
622 | |
623 | /* Read the stack limit from the kernel. If it's "unlimited", |
624 | then we can do little else besides use the default. */ |
625 | { |
626 | struct rlimit lim; |
627 | if (getrlimit(RLIMIT_STACK, &lim) == 0 |
628 | && lim.rlim_cur != RLIM_INFINITY |
629 | && lim.rlim_cur == (target_long)lim.rlim_cur) { |
630 | guest_stack_size = lim.rlim_cur; |
631 | } |
632 | } |
633 | |
634 | cpu_model = NULL; |
635 | |
636 | qemu_add_opts(&qemu_trace_opts); |
637 | |
638 | optind = parse_args(argc, argv); |
639 | |
640 | if (!trace_init_backends()) { |
641 | exit(1); |
642 | } |
643 | trace_init_file(trace_file); |
644 | |
645 | /* Zero out regs */ |
646 | memset(regs, 0, sizeof(struct target_pt_regs)); |
647 | |
648 | /* Zero out image_info */ |
649 | memset(info, 0, sizeof(struct image_info)); |
650 | |
651 | memset(&bprm, 0, sizeof (bprm)); |
652 | |
653 | /* Scan interp_prefix dir for replacement files. */ |
654 | init_paths(interp_prefix); |
655 | |
656 | init_qemu_uname_release(); |
657 | |
658 | execfd = qemu_getauxval(AT_EXECFD); |
659 | if (execfd == 0) { |
660 | execfd = open(filename, O_RDONLY); |
661 | if (execfd < 0) { |
662 | printf("Error while loading %s: %s\n" , filename, strerror(errno)); |
663 | _exit(EXIT_FAILURE); |
664 | } |
665 | } |
666 | |
667 | if (cpu_model == NULL) { |
668 | cpu_model = cpu_get_model(get_elf_eflags(execfd)); |
669 | } |
670 | cpu_type = parse_cpu_option(cpu_model); |
671 | |
672 | /* init tcg before creating CPUs and to get qemu_host_page_size */ |
673 | tcg_exec_init(0); |
674 | |
675 | /* Reserving *too* much vm space via mmap can run into problems |
676 | with rlimits, oom due to page table creation, etc. We will still try it, |
677 | if directed by the command-line option, but not by default. */ |
678 | if (HOST_LONG_BITS == 64 && |
679 | TARGET_VIRT_ADDR_SPACE_BITS <= 32 && |
680 | reserved_va == 0) { |
681 | /* reserved_va must be aligned with the host page size |
682 | * as it is used with mmap() |
683 | */ |
684 | reserved_va = MAX_RESERVED_VA & qemu_host_page_mask; |
685 | } |
686 | |
687 | cpu = cpu_create(cpu_type); |
688 | env = cpu->env_ptr; |
689 | cpu_reset(cpu); |
690 | |
691 | thread_cpu = cpu; |
692 | |
693 | if (getenv("QEMU_STRACE" )) { |
694 | do_strace = 1; |
695 | } |
696 | |
697 | if (seed_optarg == NULL) { |
698 | seed_optarg = getenv("QEMU_RAND_SEED" ); |
699 | } |
700 | { |
701 | Error *err = NULL; |
702 | if (seed_optarg != NULL) { |
703 | qemu_guest_random_seed_main(seed_optarg, &err); |
704 | } else { |
705 | qcrypto_init(&err); |
706 | } |
707 | if (err) { |
708 | error_reportf_err(err, "cannot initialize crypto: " ); |
709 | exit(1); |
710 | } |
711 | } |
712 | |
713 | target_environ = envlist_to_environ(envlist, NULL); |
714 | envlist_free(envlist); |
715 | |
716 | /* |
717 | * Now that page sizes are configured in tcg_exec_init() we can do |
718 | * proper page alignment for guest_base. |
719 | */ |
720 | guest_base = HOST_PAGE_ALIGN(guest_base); |
721 | |
722 | if (reserved_va || have_guest_base) { |
723 | guest_base = init_guest_space(guest_base, reserved_va, 0, |
724 | have_guest_base); |
725 | if (guest_base == (unsigned long)-1) { |
726 | fprintf(stderr, "Unable to reserve 0x%lx bytes of virtual address " |
727 | "space for use as guest address space (check your virtual " |
728 | "memory ulimit setting or reserve less using -R option)\n" , |
729 | reserved_va); |
730 | exit(EXIT_FAILURE); |
731 | } |
732 | |
733 | if (reserved_va) { |
734 | mmap_next_start = reserved_va; |
735 | } |
736 | } |
737 | |
738 | /* |
739 | * Read in mmap_min_addr kernel parameter. This value is used |
740 | * When loading the ELF image to determine whether guest_base |
741 | * is needed. It is also used in mmap_find_vma. |
742 | */ |
743 | { |
744 | FILE *fp; |
745 | |
746 | if ((fp = fopen("/proc/sys/vm/mmap_min_addr" , "r" )) != NULL) { |
747 | unsigned long tmp; |
748 | if (fscanf(fp, "%lu" , &tmp) == 1) { |
749 | mmap_min_addr = tmp; |
750 | qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n" , mmap_min_addr); |
751 | } |
752 | fclose(fp); |
753 | } |
754 | } |
755 | |
756 | /* |
757 | * Prepare copy of argv vector for target. |
758 | */ |
759 | target_argc = argc - optind; |
760 | target_argv = calloc(target_argc + 1, sizeof (char *)); |
761 | if (target_argv == NULL) { |
762 | (void) fprintf(stderr, "Unable to allocate memory for target_argv\n" ); |
763 | exit(EXIT_FAILURE); |
764 | } |
765 | |
766 | /* |
767 | * If argv0 is specified (using '-0' switch) we replace |
768 | * argv[0] pointer with the given one. |
769 | */ |
770 | i = 0; |
771 | if (argv0 != NULL) { |
772 | target_argv[i++] = strdup(argv0); |
773 | } |
774 | for (; i < target_argc; i++) { |
775 | target_argv[i] = strdup(argv[optind + i]); |
776 | } |
777 | target_argv[target_argc] = NULL; |
778 | |
779 | ts = g_new0(TaskState, 1); |
780 | init_task_state(ts); |
781 | /* build Task State */ |
782 | ts->info = info; |
783 | ts->bprm = &bprm; |
784 | cpu->opaque = ts; |
785 | task_settid(ts); |
786 | |
787 | ret = loader_exec(execfd, filename, target_argv, target_environ, regs, |
788 | info, &bprm); |
789 | if (ret != 0) { |
790 | printf("Error while loading %s: %s\n" , filename, strerror(-ret)); |
791 | _exit(EXIT_FAILURE); |
792 | } |
793 | |
794 | for (wrk = target_environ; *wrk; wrk++) { |
795 | g_free(*wrk); |
796 | } |
797 | |
798 | g_free(target_environ); |
799 | |
800 | if (qemu_loglevel_mask(CPU_LOG_PAGE)) { |
801 | qemu_log("guest_base 0x%lx\n" , guest_base); |
802 | log_page_dump(); |
803 | |
804 | qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n" , info->start_brk); |
805 | qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n" , info->end_code); |
806 | qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n" , info->start_code); |
807 | qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n" , info->start_data); |
808 | qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n" , info->end_data); |
809 | qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n" , info->start_stack); |
810 | qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n" , info->brk); |
811 | qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n" , info->entry); |
812 | qemu_log("argv_start 0x" TARGET_ABI_FMT_lx "\n" , info->arg_start); |
813 | qemu_log("env_start 0x" TARGET_ABI_FMT_lx "\n" , |
814 | info->arg_end + (abi_ulong)sizeof(abi_ulong)); |
815 | qemu_log("auxv_start 0x" TARGET_ABI_FMT_lx "\n" , info->saved_auxv); |
816 | } |
817 | |
818 | target_set_brk(info->brk); |
819 | syscall_init(); |
820 | signal_init(); |
821 | |
822 | /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay |
823 | generating the prologue until now so that the prologue can take |
824 | the real value of GUEST_BASE into account. */ |
825 | tcg_prologue_init(tcg_ctx); |
826 | tcg_region_init(); |
827 | |
828 | target_cpu_copy_regs(env, regs); |
829 | |
830 | if (gdbstub_port) { |
831 | if (gdbserver_start(gdbstub_port) < 0) { |
832 | fprintf(stderr, "qemu: could not open gdbserver on port %d\n" , |
833 | gdbstub_port); |
834 | exit(EXIT_FAILURE); |
835 | } |
836 | gdb_handlesig(cpu, 0); |
837 | } |
838 | cpu_loop(env); |
839 | /* never exits */ |
840 | return 0; |
841 | } |
842 | |