linux-user: Add support for a group of btrfs ioctls used for snapshots
[qemu.git] / linux-user / main.c
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 #include <sys/shm.h>
28
29 #include "qapi/error.h"
30 #include "qemu.h"
31 #include "qemu/path.h"
32 #include "qemu/queue.h"
33 #include "qemu/config-file.h"
34 #include "qemu/cutils.h"
35 #include "qemu/error-report.h"
36 #include "qemu/help_option.h"
37 #include "qemu/module.h"
38 #include "qemu/plugin.h"
39 #include "cpu.h"
40 #include "exec/exec-all.h"
41 #include "tcg/tcg.h"
42 #include "qemu/timer.h"
43 #include "qemu/envlist.h"
44 #include "qemu/guest-random.h"
45 #include "elf.h"
46 #include "trace/control.h"
47 #include "target_elf.h"
48 #include "cpu_loop-common.h"
49 #include "crypto/init.h"
50
51 char *exec_path;
52
53 int singlestep;
54 static const char *argv0;
55 static const char *gdbstub;
56 static envlist_t *envlist;
57 static const char *cpu_model;
58 static const char *cpu_type;
59 static const char *seed_optarg;
60 unsigned long mmap_min_addr;
61 unsigned long guest_base;
62 bool have_guest_base;
63
64 /*
65 * Used to implement backwards-compatibility for the `-strace`, and
66 * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by
67 * -strace, or vice versa.
68 */
69 static bool enable_strace;
70
71 /*
72 * The last log mask given by the user in an environment variable or argument.
73 * Used to support command line arguments overriding environment variables.
74 */
75 static int last_log_mask;
76
77 /*
78 * When running 32-on-64 we should make sure we can fit all of the possible
79 * guest address space into a contiguous chunk of virtual host memory.
80 *
81 * This way we will never overlap with our own libraries or binaries or stack
82 * or anything else that QEMU maps.
83 *
84 * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
85 * of the address for the kernel. Some cpus rely on this and user space
86 * uses the high bit(s) for pointer tagging and the like. For them, we
87 * must preserve the expected address space.
88 */
89 #ifndef MAX_RESERVED_VA
90 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
91 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
92 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
93 /* There are a number of places where we assign reserved_va to a variable
94 of type abi_ulong and expect it to fit. Avoid the last page. */
95 # define MAX_RESERVED_VA(CPU) (0xfffffffful & TARGET_PAGE_MASK)
96 # else
97 # define MAX_RESERVED_VA(CPU) (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
98 # endif
99 # else
100 # define MAX_RESERVED_VA(CPU) 0
101 # endif
102 #endif
103
104 unsigned long reserved_va;
105
106 static void usage(int exitcode);
107
108 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
109 const char *qemu_uname_release;
110
111 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
112 we allocate a bigger stack. Need a better solution, for example
113 by remapping the process stack directly at the right place */
114 unsigned long guest_stack_size = 8 * 1024 * 1024UL;
115
116 #if defined(TARGET_I386)
117 int cpu_get_pic_interrupt(CPUX86State *env)
118 {
119 return -1;
120 }
121 #endif
122
123 /***********************************************************/
124 /* Helper routines for implementing atomic operations. */
125
126 /* Make sure everything is in a consistent state for calling fork(). */
127 void fork_start(void)
128 {
129 start_exclusive();
130 mmap_fork_start();
131 cpu_list_lock();
132 }
133
134 void fork_end(int child)
135 {
136 mmap_fork_end(child);
137 if (child) {
138 CPUState *cpu, *next_cpu;
139 /* Child processes created by fork() only have a single thread.
140 Discard information about the parent threads. */
141 CPU_FOREACH_SAFE(cpu, next_cpu) {
142 if (cpu != thread_cpu) {
143 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
144 }
145 }
146 qemu_init_cpu_list();
147 gdbserver_fork(thread_cpu);
148 /* qemu_init_cpu_list() takes care of reinitializing the
149 * exclusive state, so we don't need to end_exclusive() here.
150 */
151 } else {
152 cpu_list_unlock();
153 end_exclusive();
154 }
155 }
156
157 __thread CPUState *thread_cpu;
158
159 bool qemu_cpu_is_self(CPUState *cpu)
160 {
161 return thread_cpu == cpu;
162 }
163
164 void qemu_cpu_kick(CPUState *cpu)
165 {
166 cpu_exit(cpu);
167 }
168
169 void task_settid(TaskState *ts)
170 {
171 if (ts->ts_tid == 0) {
172 ts->ts_tid = (pid_t)syscall(SYS_gettid);
173 }
174 }
175
176 void stop_all_tasks(void)
177 {
178 /*
179 * We trust that when using NPTL, start_exclusive()
180 * handles thread stopping correctly.
181 */
182 start_exclusive();
183 }
184
185 /* Assumes contents are already zeroed. */
186 void init_task_state(TaskState *ts)
187 {
188 ts->used = 1;
189 ts->sigaltstack_used = (struct target_sigaltstack) {
190 .ss_sp = 0,
191 .ss_size = 0,
192 .ss_flags = TARGET_SS_DISABLE,
193 };
194 }
195
196 CPUArchState *cpu_copy(CPUArchState *env)
197 {
198 CPUState *cpu = env_cpu(env);
199 CPUState *new_cpu = cpu_create(cpu_type);
200 CPUArchState *new_env = new_cpu->env_ptr;
201 CPUBreakpoint *bp;
202 CPUWatchpoint *wp;
203
204 /* Reset non arch specific state */
205 cpu_reset(new_cpu);
206
207 memcpy(new_env, env, sizeof(CPUArchState));
208
209 /* Clone all break/watchpoints.
210 Note: Once we support ptrace with hw-debug register access, make sure
211 BP_CPU break/watchpoints are handled correctly on clone. */
212 QTAILQ_INIT(&new_cpu->breakpoints);
213 QTAILQ_INIT(&new_cpu->watchpoints);
214 QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
215 cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
216 }
217 QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
218 cpu_watchpoint_insert(new_cpu, wp->vaddr, wp->len, wp->flags, NULL);
219 }
220
221 return new_env;
222 }
223
224 static void handle_arg_help(const char *arg)
225 {
226 usage(EXIT_SUCCESS);
227 }
228
229 static void handle_arg_log(const char *arg)
230 {
231 last_log_mask = qemu_str_to_log_mask(arg);
232 if (!last_log_mask) {
233 qemu_print_log_usage(stdout);
234 exit(EXIT_FAILURE);
235 }
236 }
237
238 static void handle_arg_dfilter(const char *arg)
239 {
240 qemu_set_dfilter_ranges(arg, &error_fatal);
241 }
242
243 static void handle_arg_log_filename(const char *arg)
244 {
245 qemu_set_log_filename(arg, &error_fatal);
246 }
247
248 static void handle_arg_set_env(const char *arg)
249 {
250 char *r, *p, *token;
251 r = p = strdup(arg);
252 while ((token = strsep(&p, ",")) != NULL) {
253 if (envlist_setenv(envlist, token) != 0) {
254 usage(EXIT_FAILURE);
255 }
256 }
257 free(r);
258 }
259
260 static void handle_arg_unset_env(const char *arg)
261 {
262 char *r, *p, *token;
263 r = p = strdup(arg);
264 while ((token = strsep(&p, ",")) != NULL) {
265 if (envlist_unsetenv(envlist, token) != 0) {
266 usage(EXIT_FAILURE);
267 }
268 }
269 free(r);
270 }
271
272 static void handle_arg_argv0(const char *arg)
273 {
274 argv0 = strdup(arg);
275 }
276
277 static void handle_arg_stack_size(const char *arg)
278 {
279 char *p;
280 guest_stack_size = strtoul(arg, &p, 0);
281 if (guest_stack_size == 0) {
282 usage(EXIT_FAILURE);
283 }
284
285 if (*p == 'M') {
286 guest_stack_size *= MiB;
287 } else if (*p == 'k' || *p == 'K') {
288 guest_stack_size *= KiB;
289 }
290 }
291
292 static void handle_arg_ld_prefix(const char *arg)
293 {
294 interp_prefix = strdup(arg);
295 }
296
297 static void handle_arg_pagesize(const char *arg)
298 {
299 qemu_host_page_size = atoi(arg);
300 if (qemu_host_page_size == 0 ||
301 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
302 fprintf(stderr, "page size must be a power of two\n");
303 exit(EXIT_FAILURE);
304 }
305 }
306
307 static void handle_arg_seed(const char *arg)
308 {
309 seed_optarg = arg;
310 }
311
312 static void handle_arg_gdb(const char *arg)
313 {
314 gdbstub = g_strdup(arg);
315 }
316
317 static void handle_arg_uname(const char *arg)
318 {
319 qemu_uname_release = strdup(arg);
320 }
321
322 static void handle_arg_cpu(const char *arg)
323 {
324 cpu_model = strdup(arg);
325 if (cpu_model == NULL || is_help_option(cpu_model)) {
326 /* XXX: implement xxx_cpu_list for targets that still miss it */
327 #if defined(cpu_list)
328 cpu_list();
329 #endif
330 exit(EXIT_FAILURE);
331 }
332 }
333
334 static void handle_arg_guest_base(const char *arg)
335 {
336 guest_base = strtol(arg, NULL, 0);
337 have_guest_base = true;
338 }
339
340 static void handle_arg_reserved_va(const char *arg)
341 {
342 char *p;
343 int shift = 0;
344 reserved_va = strtoul(arg, &p, 0);
345 switch (*p) {
346 case 'k':
347 case 'K':
348 shift = 10;
349 break;
350 case 'M':
351 shift = 20;
352 break;
353 case 'G':
354 shift = 30;
355 break;
356 }
357 if (shift) {
358 unsigned long unshifted = reserved_va;
359 p++;
360 reserved_va <<= shift;
361 if (reserved_va >> shift != unshifted) {
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 enable_strace = true;
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 #if defined(TARGET_XTENSA)
397 static void handle_arg_abi_call0(const char *arg)
398 {
399 xtensa_set_abi_call0();
400 }
401 #endif
402
403 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins);
404
405 #ifdef CONFIG_PLUGIN
406 static void handle_arg_plugin(const char *arg)
407 {
408 qemu_plugin_opt_parse(arg, &plugins);
409 }
410 #endif
411
412 struct qemu_argument {
413 const char *argv;
414 const char *env;
415 bool has_arg;
416 void (*handle_opt)(const char *arg);
417 const char *example;
418 const char *help;
419 };
420
421 static const struct qemu_argument arg_table[] = {
422 {"h", "", false, handle_arg_help,
423 "", "print this help"},
424 {"help", "", false, handle_arg_help,
425 "", ""},
426 {"g", "QEMU_GDB", true, handle_arg_gdb,
427 "port", "wait gdb connection to 'port'"},
428 {"L", "QEMU_LD_PREFIX", true, handle_arg_ld_prefix,
429 "path", "set the elf interpreter prefix to 'path'"},
430 {"s", "QEMU_STACK_SIZE", true, handle_arg_stack_size,
431 "size", "set the stack size to 'size' bytes"},
432 {"cpu", "QEMU_CPU", true, handle_arg_cpu,
433 "model", "select CPU (-cpu help for list)"},
434 {"E", "QEMU_SET_ENV", true, handle_arg_set_env,
435 "var=value", "sets targets environment variable (see below)"},
436 {"U", "QEMU_UNSET_ENV", true, handle_arg_unset_env,
437 "var", "unsets targets environment variable (see below)"},
438 {"0", "QEMU_ARGV0", true, handle_arg_argv0,
439 "argv0", "forces target process argv[0] to be 'argv0'"},
440 {"r", "QEMU_UNAME", true, handle_arg_uname,
441 "uname", "set qemu uname release string to 'uname'"},
442 {"B", "QEMU_GUEST_BASE", true, handle_arg_guest_base,
443 "address", "set guest_base address to 'address'"},
444 {"R", "QEMU_RESERVED_VA", true, handle_arg_reserved_va,
445 "size", "reserve 'size' bytes for guest virtual address space"},
446 {"d", "QEMU_LOG", true, handle_arg_log,
447 "item[,...]", "enable logging of specified items "
448 "(use '-d help' for a list of items)"},
449 {"dfilter", "QEMU_DFILTER", true, handle_arg_dfilter,
450 "range[,...]","filter logging based on address range"},
451 {"D", "QEMU_LOG_FILENAME", true, handle_arg_log_filename,
452 "logfile", "write logs to 'logfile' (default stderr)"},
453 {"p", "QEMU_PAGESIZE", true, handle_arg_pagesize,
454 "pagesize", "set the host page size to 'pagesize'"},
455 {"singlestep", "QEMU_SINGLESTEP", false, handle_arg_singlestep,
456 "", "run in singlestep mode"},
457 {"strace", "QEMU_STRACE", false, handle_arg_strace,
458 "", "log system calls"},
459 {"seed", "QEMU_RAND_SEED", true, handle_arg_seed,
460 "", "Seed for pseudo-random number generator"},
461 {"trace", "QEMU_TRACE", true, handle_arg_trace,
462 "", "[[enable=]<pattern>][,events=<file>][,file=<file>]"},
463 #ifdef CONFIG_PLUGIN
464 {"plugin", "QEMU_PLUGIN", true, handle_arg_plugin,
465 "", "[file=]<file>[,arg=<string>]"},
466 #endif
467 {"version", "QEMU_VERSION", false, handle_arg_version,
468 "", "display version information and exit"},
469 #if defined(TARGET_XTENSA)
470 {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0,
471 "", "assume CALL0 Xtensa ABI"},
472 #endif
473 {NULL, NULL, false, NULL, NULL, NULL}
474 };
475
476 static void usage(int exitcode)
477 {
478 const struct qemu_argument *arginfo;
479 int maxarglen;
480 int maxenvlen;
481
482 printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
483 "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n"
484 "\n"
485 "Options and associated environment variables:\n"
486 "\n");
487
488 /* Calculate column widths. We must always have at least enough space
489 * for the column header.
490 */
491 maxarglen = strlen("Argument");
492 maxenvlen = strlen("Env-variable");
493
494 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
495 int arglen = strlen(arginfo->argv);
496 if (arginfo->has_arg) {
497 arglen += strlen(arginfo->example) + 1;
498 }
499 if (strlen(arginfo->env) > maxenvlen) {
500 maxenvlen = strlen(arginfo->env);
501 }
502 if (arglen > maxarglen) {
503 maxarglen = arglen;
504 }
505 }
506
507 printf("%-*s %-*s Description\n", maxarglen+1, "Argument",
508 maxenvlen, "Env-variable");
509
510 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
511 if (arginfo->has_arg) {
512 printf("-%s %-*s %-*s %s\n", arginfo->argv,
513 (int)(maxarglen - strlen(arginfo->argv) - 1),
514 arginfo->example, maxenvlen, arginfo->env, arginfo->help);
515 } else {
516 printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
517 maxenvlen, arginfo->env,
518 arginfo->help);
519 }
520 }
521
522 printf("\n"
523 "Defaults:\n"
524 "QEMU_LD_PREFIX = %s\n"
525 "QEMU_STACK_SIZE = %ld byte\n",
526 interp_prefix,
527 guest_stack_size);
528
529 printf("\n"
530 "You can use -E and -U options or the QEMU_SET_ENV and\n"
531 "QEMU_UNSET_ENV environment variables to set and unset\n"
532 "environment variables for the target process.\n"
533 "It is possible to provide several variables by separating them\n"
534 "by commas in getsubopt(3) style. Additionally it is possible to\n"
535 "provide the -E and -U options multiple times.\n"
536 "The following lines are equivalent:\n"
537 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
538 " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n"
539 " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n"
540 "Note that if you provide several changes to a single variable\n"
541 "the last change will stay in effect.\n"
542 "\n"
543 QEMU_HELP_BOTTOM "\n");
544
545 exit(exitcode);
546 }
547
548 static int parse_args(int argc, char **argv)
549 {
550 const char *r;
551 int optind;
552 const struct qemu_argument *arginfo;
553
554 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
555 if (arginfo->env == NULL) {
556 continue;
557 }
558
559 r = getenv(arginfo->env);
560 if (r != NULL) {
561 arginfo->handle_opt(r);
562 }
563 }
564
565 optind = 1;
566 for (;;) {
567 if (optind >= argc) {
568 break;
569 }
570 r = argv[optind];
571 if (r[0] != '-') {
572 break;
573 }
574 optind++;
575 r++;
576 if (!strcmp(r, "-")) {
577 break;
578 }
579 /* Treat --foo the same as -foo. */
580 if (r[0] == '-') {
581 r++;
582 }
583
584 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
585 if (!strcmp(r, arginfo->argv)) {
586 if (arginfo->has_arg) {
587 if (optind >= argc) {
588 (void) fprintf(stderr,
589 "qemu: missing argument for option '%s'\n", r);
590 exit(EXIT_FAILURE);
591 }
592 arginfo->handle_opt(argv[optind]);
593 optind++;
594 } else {
595 arginfo->handle_opt(NULL);
596 }
597 break;
598 }
599 }
600
601 /* no option matched the current argv */
602 if (arginfo->handle_opt == NULL) {
603 (void) fprintf(stderr, "qemu: unknown option '%s'\n", r);
604 exit(EXIT_FAILURE);
605 }
606 }
607
608 if (optind >= argc) {
609 (void) fprintf(stderr, "qemu: no user program specified\n");
610 exit(EXIT_FAILURE);
611 }
612
613 exec_path = argv[optind];
614
615 return optind;
616 }
617
618 int main(int argc, char **argv, char **envp)
619 {
620 struct target_pt_regs regs1, *regs = &regs1;
621 struct image_info info1, *info = &info1;
622 struct linux_binprm bprm;
623 TaskState *ts;
624 CPUArchState *env;
625 CPUState *cpu;
626 int optind;
627 char **target_environ, **wrk;
628 char **target_argv;
629 int target_argc;
630 int i;
631 int ret;
632 int execfd;
633 int log_mask;
634 unsigned long max_reserved_va;
635
636 error_init(argv[0]);
637 module_call_init(MODULE_INIT_TRACE);
638 qemu_init_cpu_list();
639 module_call_init(MODULE_INIT_QOM);
640
641 envlist = envlist_create();
642
643 /* add current environment into the list */
644 for (wrk = environ; *wrk != NULL; wrk++) {
645 (void) envlist_setenv(envlist, *wrk);
646 }
647
648 /* Read the stack limit from the kernel. If it's "unlimited",
649 then we can do little else besides use the default. */
650 {
651 struct rlimit lim;
652 if (getrlimit(RLIMIT_STACK, &lim) == 0
653 && lim.rlim_cur != RLIM_INFINITY
654 && lim.rlim_cur == (target_long)lim.rlim_cur) {
655 guest_stack_size = lim.rlim_cur;
656 }
657 }
658
659 cpu_model = NULL;
660
661 qemu_add_opts(&qemu_trace_opts);
662 qemu_plugin_add_opts();
663
664 optind = parse_args(argc, argv);
665
666 log_mask = last_log_mask | (enable_strace ? LOG_STRACE : 0);
667 if (log_mask) {
668 qemu_log_needs_buffers();
669 qemu_set_log(log_mask);
670 }
671
672 if (!trace_init_backends()) {
673 exit(1);
674 }
675 trace_init_file(trace_file);
676 if (qemu_plugin_load_list(&plugins)) {
677 exit(1);
678 }
679
680 /* Zero out regs */
681 memset(regs, 0, sizeof(struct target_pt_regs));
682
683 /* Zero out image_info */
684 memset(info, 0, sizeof(struct image_info));
685
686 memset(&bprm, 0, sizeof (bprm));
687
688 /* Scan interp_prefix dir for replacement files. */
689 init_paths(interp_prefix);
690
691 init_qemu_uname_release();
692
693 execfd = qemu_getauxval(AT_EXECFD);
694 if (execfd == 0) {
695 execfd = open(exec_path, O_RDONLY);
696 if (execfd < 0) {
697 printf("Error while loading %s: %s\n", exec_path, strerror(errno));
698 _exit(EXIT_FAILURE);
699 }
700 }
701
702 if (cpu_model == NULL) {
703 cpu_model = cpu_get_model(get_elf_eflags(execfd));
704 }
705 cpu_type = parse_cpu_option(cpu_model);
706
707 /* init tcg before creating CPUs and to get qemu_host_page_size */
708 tcg_exec_init(0);
709
710 cpu = cpu_create(cpu_type);
711 env = cpu->env_ptr;
712 cpu_reset(cpu);
713 thread_cpu = cpu;
714
715 /*
716 * Reserving too much vm space via mmap can run into problems
717 * with rlimits, oom due to page table creation, etc. We will
718 * still try it, if directed by the command-line option, but
719 * not by default.
720 */
721 max_reserved_va = MAX_RESERVED_VA(cpu);
722 if (reserved_va != 0) {
723 if (max_reserved_va && reserved_va > max_reserved_va) {
724 fprintf(stderr, "Reserved virtual address too big\n");
725 exit(EXIT_FAILURE);
726 }
727 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
728 /*
729 * reserved_va must be aligned with the host page size
730 * as it is used with mmap()
731 */
732 reserved_va = max_reserved_va & qemu_host_page_mask;
733 }
734
735 {
736 Error *err = NULL;
737 if (seed_optarg != NULL) {
738 qemu_guest_random_seed_main(seed_optarg, &err);
739 } else {
740 qcrypto_init(&err);
741 }
742 if (err) {
743 error_reportf_err(err, "cannot initialize crypto: ");
744 exit(1);
745 }
746 }
747
748 target_environ = envlist_to_environ(envlist, NULL);
749 envlist_free(envlist);
750
751 /*
752 * Read in mmap_min_addr kernel parameter. This value is used
753 * When loading the ELF image to determine whether guest_base
754 * is needed. It is also used in mmap_find_vma.
755 */
756 {
757 FILE *fp;
758
759 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
760 unsigned long tmp;
761 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
762 mmap_min_addr = tmp;
763 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
764 mmap_min_addr);
765 }
766 fclose(fp);
767 }
768 }
769
770 /*
771 * We prefer to not make NULL pointers accessible to QEMU.
772 * If we're in a chroot with no /proc, fall back to 1 page.
773 */
774 if (mmap_min_addr == 0) {
775 mmap_min_addr = qemu_host_page_size;
776 qemu_log_mask(CPU_LOG_PAGE,
777 "host mmap_min_addr=0x%lx (fallback)\n",
778 mmap_min_addr);
779 }
780
781 /*
782 * Prepare copy of argv vector for target.
783 */
784 target_argc = argc - optind;
785 target_argv = calloc(target_argc + 1, sizeof (char *));
786 if (target_argv == NULL) {
787 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
788 exit(EXIT_FAILURE);
789 }
790
791 /*
792 * If argv0 is specified (using '-0' switch) we replace
793 * argv[0] pointer with the given one.
794 */
795 i = 0;
796 if (argv0 != NULL) {
797 target_argv[i++] = strdup(argv0);
798 }
799 for (; i < target_argc; i++) {
800 target_argv[i] = strdup(argv[optind + i]);
801 }
802 target_argv[target_argc] = NULL;
803
804 ts = g_new0(TaskState, 1);
805 init_task_state(ts);
806 /* build Task State */
807 ts->info = info;
808 ts->bprm = &bprm;
809 cpu->opaque = ts;
810 task_settid(ts);
811
812 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs,
813 info, &bprm);
814 if (ret != 0) {
815 printf("Error while loading %s: %s\n", exec_path, strerror(-ret));
816 _exit(EXIT_FAILURE);
817 }
818
819 for (wrk = target_environ; *wrk; wrk++) {
820 g_free(*wrk);
821 }
822
823 g_free(target_environ);
824
825 if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
826 qemu_log("guest_base 0x%lx\n", guest_base);
827 log_page_dump("binary load");
828
829 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
830 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code);
831 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", info->start_code);
832 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", info->start_data);
833 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data);
834 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
835 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
836 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
837 qemu_log("argv_start 0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
838 qemu_log("env_start 0x" TARGET_ABI_FMT_lx "\n",
839 info->arg_end + (abi_ulong)sizeof(abi_ulong));
840 qemu_log("auxv_start 0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
841 }
842
843 target_set_brk(info->brk);
844 syscall_init();
845 signal_init();
846
847 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay
848 generating the prologue until now so that the prologue can take
849 the real value of GUEST_BASE into account. */
850 tcg_prologue_init(tcg_ctx);
851 tcg_region_init();
852
853 target_cpu_copy_regs(env, regs);
854
855 if (gdbstub) {
856 if (gdbserver_start(gdbstub) < 0) {
857 fprintf(stderr, "qemu: could not open gdbserver on %s\n",
858 gdbstub);
859 exit(EXIT_FAILURE);
860 }
861 gdb_handlesig(cpu, 0);
862 }
863 cpu_loop(env);
864 /* never exits */
865 return 0;
866 }