tmp105: Correct handling of temperature limit checks
[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 void handle_arg_trace(const char *arg)
390 {
391 trace_opt_parse(arg);
392 }
393
394 #if defined(TARGET_XTENSA)
395 static void handle_arg_abi_call0(const char *arg)
396 {
397 xtensa_set_abi_call0();
398 }
399 #endif
400
401 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins);
402
403 #ifdef CONFIG_PLUGIN
404 static void handle_arg_plugin(const char *arg)
405 {
406 qemu_plugin_opt_parse(arg, &plugins);
407 }
408 #endif
409
410 struct qemu_argument {
411 const char *argv;
412 const char *env;
413 bool has_arg;
414 void (*handle_opt)(const char *arg);
415 const char *example;
416 const char *help;
417 };
418
419 static const struct qemu_argument arg_table[] = {
420 {"h", "", false, handle_arg_help,
421 "", "print this help"},
422 {"help", "", false, handle_arg_help,
423 "", ""},
424 {"g", "QEMU_GDB", true, handle_arg_gdb,
425 "port", "wait gdb connection to 'port'"},
426 {"L", "QEMU_LD_PREFIX", true, handle_arg_ld_prefix,
427 "path", "set the elf interpreter prefix to 'path'"},
428 {"s", "QEMU_STACK_SIZE", true, handle_arg_stack_size,
429 "size", "set the stack size to 'size' bytes"},
430 {"cpu", "QEMU_CPU", true, handle_arg_cpu,
431 "model", "select CPU (-cpu help for list)"},
432 {"E", "QEMU_SET_ENV", true, handle_arg_set_env,
433 "var=value", "sets targets environment variable (see below)"},
434 {"U", "QEMU_UNSET_ENV", true, handle_arg_unset_env,
435 "var", "unsets targets environment variable (see below)"},
436 {"0", "QEMU_ARGV0", true, handle_arg_argv0,
437 "argv0", "forces target process argv[0] to be 'argv0'"},
438 {"r", "QEMU_UNAME", true, handle_arg_uname,
439 "uname", "set qemu uname release string to 'uname'"},
440 {"B", "QEMU_GUEST_BASE", true, handle_arg_guest_base,
441 "address", "set guest_base address to 'address'"},
442 {"R", "QEMU_RESERVED_VA", true, handle_arg_reserved_va,
443 "size", "reserve 'size' bytes for guest virtual address space"},
444 {"d", "QEMU_LOG", true, handle_arg_log,
445 "item[,...]", "enable logging of specified items "
446 "(use '-d help' for a list of items)"},
447 {"dfilter", "QEMU_DFILTER", true, handle_arg_dfilter,
448 "range[,...]","filter logging based on address range"},
449 {"D", "QEMU_LOG_FILENAME", true, handle_arg_log_filename,
450 "logfile", "write logs to 'logfile' (default stderr)"},
451 {"p", "QEMU_PAGESIZE", true, handle_arg_pagesize,
452 "pagesize", "set the host page size to 'pagesize'"},
453 {"singlestep", "QEMU_SINGLESTEP", false, handle_arg_singlestep,
454 "", "run in singlestep mode"},
455 {"strace", "QEMU_STRACE", false, handle_arg_strace,
456 "", "log system calls"},
457 {"seed", "QEMU_RAND_SEED", true, handle_arg_seed,
458 "", "Seed for pseudo-random number generator"},
459 {"trace", "QEMU_TRACE", true, handle_arg_trace,
460 "", "[[enable=]<pattern>][,events=<file>][,file=<file>]"},
461 #ifdef CONFIG_PLUGIN
462 {"plugin", "QEMU_PLUGIN", true, handle_arg_plugin,
463 "", "[file=]<file>[,arg=<string>]"},
464 #endif
465 {"version", "QEMU_VERSION", false, handle_arg_version,
466 "", "display version information and exit"},
467 #if defined(TARGET_XTENSA)
468 {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0,
469 "", "assume CALL0 Xtensa ABI"},
470 #endif
471 {NULL, NULL, false, NULL, NULL, NULL}
472 };
473
474 static void usage(int exitcode)
475 {
476 const struct qemu_argument *arginfo;
477 int maxarglen;
478 int maxenvlen;
479
480 printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
481 "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n"
482 "\n"
483 "Options and associated environment variables:\n"
484 "\n");
485
486 /* Calculate column widths. We must always have at least enough space
487 * for the column header.
488 */
489 maxarglen = strlen("Argument");
490 maxenvlen = strlen("Env-variable");
491
492 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
493 int arglen = strlen(arginfo->argv);
494 if (arginfo->has_arg) {
495 arglen += strlen(arginfo->example) + 1;
496 }
497 if (strlen(arginfo->env) > maxenvlen) {
498 maxenvlen = strlen(arginfo->env);
499 }
500 if (arglen > maxarglen) {
501 maxarglen = arglen;
502 }
503 }
504
505 printf("%-*s %-*s Description\n", maxarglen+1, "Argument",
506 maxenvlen, "Env-variable");
507
508 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
509 if (arginfo->has_arg) {
510 printf("-%s %-*s %-*s %s\n", arginfo->argv,
511 (int)(maxarglen - strlen(arginfo->argv) - 1),
512 arginfo->example, maxenvlen, arginfo->env, arginfo->help);
513 } else {
514 printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
515 maxenvlen, arginfo->env,
516 arginfo->help);
517 }
518 }
519
520 printf("\n"
521 "Defaults:\n"
522 "QEMU_LD_PREFIX = %s\n"
523 "QEMU_STACK_SIZE = %ld byte\n",
524 interp_prefix,
525 guest_stack_size);
526
527 printf("\n"
528 "You can use -E and -U options or the QEMU_SET_ENV and\n"
529 "QEMU_UNSET_ENV environment variables to set and unset\n"
530 "environment variables for the target process.\n"
531 "It is possible to provide several variables by separating them\n"
532 "by commas in getsubopt(3) style. Additionally it is possible to\n"
533 "provide the -E and -U options multiple times.\n"
534 "The following lines are equivalent:\n"
535 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
536 " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n"
537 " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n"
538 "Note that if you provide several changes to a single variable\n"
539 "the last change will stay in effect.\n"
540 "\n"
541 QEMU_HELP_BOTTOM "\n");
542
543 exit(exitcode);
544 }
545
546 static int parse_args(int argc, char **argv)
547 {
548 const char *r;
549 int optind;
550 const struct qemu_argument *arginfo;
551
552 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
553 if (arginfo->env == NULL) {
554 continue;
555 }
556
557 r = getenv(arginfo->env);
558 if (r != NULL) {
559 arginfo->handle_opt(r);
560 }
561 }
562
563 optind = 1;
564 for (;;) {
565 if (optind >= argc) {
566 break;
567 }
568 r = argv[optind];
569 if (r[0] != '-') {
570 break;
571 }
572 optind++;
573 r++;
574 if (!strcmp(r, "-")) {
575 break;
576 }
577 /* Treat --foo the same as -foo. */
578 if (r[0] == '-') {
579 r++;
580 }
581
582 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
583 if (!strcmp(r, arginfo->argv)) {
584 if (arginfo->has_arg) {
585 if (optind >= argc) {
586 (void) fprintf(stderr,
587 "qemu: missing argument for option '%s'\n", r);
588 exit(EXIT_FAILURE);
589 }
590 arginfo->handle_opt(argv[optind]);
591 optind++;
592 } else {
593 arginfo->handle_opt(NULL);
594 }
595 break;
596 }
597 }
598
599 /* no option matched the current argv */
600 if (arginfo->handle_opt == NULL) {
601 (void) fprintf(stderr, "qemu: unknown option '%s'\n", r);
602 exit(EXIT_FAILURE);
603 }
604 }
605
606 if (optind >= argc) {
607 (void) fprintf(stderr, "qemu: no user program specified\n");
608 exit(EXIT_FAILURE);
609 }
610
611 exec_path = argv[optind];
612
613 return optind;
614 }
615
616 int main(int argc, char **argv, char **envp)
617 {
618 struct target_pt_regs regs1, *regs = &regs1;
619 struct image_info info1, *info = &info1;
620 struct linux_binprm bprm;
621 TaskState *ts;
622 CPUArchState *env;
623 CPUState *cpu;
624 int optind;
625 char **target_environ, **wrk;
626 char **target_argv;
627 int target_argc;
628 int i;
629 int ret;
630 int execfd;
631 int log_mask;
632 unsigned long max_reserved_va;
633
634 error_init(argv[0]);
635 module_call_init(MODULE_INIT_TRACE);
636 qemu_init_cpu_list();
637 module_call_init(MODULE_INIT_QOM);
638
639 envlist = envlist_create();
640
641 /* add current environment into the list */
642 for (wrk = environ; *wrk != NULL; wrk++) {
643 (void) envlist_setenv(envlist, *wrk);
644 }
645
646 /* Read the stack limit from the kernel. If it's "unlimited",
647 then we can do little else besides use the default. */
648 {
649 struct rlimit lim;
650 if (getrlimit(RLIMIT_STACK, &lim) == 0
651 && lim.rlim_cur != RLIM_INFINITY
652 && lim.rlim_cur == (target_long)lim.rlim_cur) {
653 guest_stack_size = lim.rlim_cur;
654 }
655 }
656
657 cpu_model = NULL;
658
659 qemu_add_opts(&qemu_trace_opts);
660 qemu_plugin_add_opts();
661
662 optind = parse_args(argc, argv);
663
664 log_mask = last_log_mask | (enable_strace ? LOG_STRACE : 0);
665 if (log_mask) {
666 qemu_log_needs_buffers();
667 qemu_set_log(log_mask);
668 }
669
670 if (!trace_init_backends()) {
671 exit(1);
672 }
673 trace_init_file();
674 if (qemu_plugin_load_list(&plugins)) {
675 exit(1);
676 }
677
678 /* Zero out regs */
679 memset(regs, 0, sizeof(struct target_pt_regs));
680
681 /* Zero out image_info */
682 memset(info, 0, sizeof(struct image_info));
683
684 memset(&bprm, 0, sizeof (bprm));
685
686 /* Scan interp_prefix dir for replacement files. */
687 init_paths(interp_prefix);
688
689 init_qemu_uname_release();
690
691 execfd = qemu_getauxval(AT_EXECFD);
692 if (execfd == 0) {
693 execfd = open(exec_path, O_RDONLY);
694 if (execfd < 0) {
695 printf("Error while loading %s: %s\n", exec_path, strerror(errno));
696 _exit(EXIT_FAILURE);
697 }
698 }
699
700 if (cpu_model == NULL) {
701 cpu_model = cpu_get_model(get_elf_eflags(execfd));
702 }
703 cpu_type = parse_cpu_option(cpu_model);
704
705 /* init tcg before creating CPUs and to get qemu_host_page_size */
706 tcg_exec_init(0);
707
708 cpu = cpu_create(cpu_type);
709 env = cpu->env_ptr;
710 cpu_reset(cpu);
711 thread_cpu = cpu;
712
713 /*
714 * Reserving too much vm space via mmap can run into problems
715 * with rlimits, oom due to page table creation, etc. We will
716 * still try it, if directed by the command-line option, but
717 * not by default.
718 */
719 max_reserved_va = MAX_RESERVED_VA(cpu);
720 if (reserved_va != 0) {
721 if (max_reserved_va && reserved_va > max_reserved_va) {
722 fprintf(stderr, "Reserved virtual address too big\n");
723 exit(EXIT_FAILURE);
724 }
725 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
726 /*
727 * reserved_va must be aligned with the host page size
728 * as it is used with mmap()
729 */
730 reserved_va = max_reserved_va & qemu_host_page_mask;
731 }
732
733 {
734 Error *err = NULL;
735 if (seed_optarg != NULL) {
736 qemu_guest_random_seed_main(seed_optarg, &err);
737 } else {
738 qcrypto_init(&err);
739 }
740 if (err) {
741 error_reportf_err(err, "cannot initialize crypto: ");
742 exit(1);
743 }
744 }
745
746 target_environ = envlist_to_environ(envlist, NULL);
747 envlist_free(envlist);
748
749 /*
750 * Read in mmap_min_addr kernel parameter. This value is used
751 * When loading the ELF image to determine whether guest_base
752 * is needed. It is also used in mmap_find_vma.
753 */
754 {
755 FILE *fp;
756
757 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
758 unsigned long tmp;
759 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
760 mmap_min_addr = tmp;
761 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
762 mmap_min_addr);
763 }
764 fclose(fp);
765 }
766 }
767
768 /*
769 * We prefer to not make NULL pointers accessible to QEMU.
770 * If we're in a chroot with no /proc, fall back to 1 page.
771 */
772 if (mmap_min_addr == 0) {
773 mmap_min_addr = qemu_host_page_size;
774 qemu_log_mask(CPU_LOG_PAGE,
775 "host mmap_min_addr=0x%lx (fallback)\n",
776 mmap_min_addr);
777 }
778
779 /*
780 * Prepare copy of argv vector for target.
781 */
782 target_argc = argc - optind;
783 target_argv = calloc(target_argc + 1, sizeof (char *));
784 if (target_argv == NULL) {
785 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
786 exit(EXIT_FAILURE);
787 }
788
789 /*
790 * If argv0 is specified (using '-0' switch) we replace
791 * argv[0] pointer with the given one.
792 */
793 i = 0;
794 if (argv0 != NULL) {
795 target_argv[i++] = strdup(argv0);
796 }
797 for (; i < target_argc; i++) {
798 target_argv[i] = strdup(argv[optind + i]);
799 }
800 target_argv[target_argc] = NULL;
801
802 ts = g_new0(TaskState, 1);
803 init_task_state(ts);
804 /* build Task State */
805 ts->info = info;
806 ts->bprm = &bprm;
807 cpu->opaque = ts;
808 task_settid(ts);
809
810 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs,
811 info, &bprm);
812 if (ret != 0) {
813 printf("Error while loading %s: %s\n", exec_path, strerror(-ret));
814 _exit(EXIT_FAILURE);
815 }
816
817 for (wrk = target_environ; *wrk; wrk++) {
818 g_free(*wrk);
819 }
820
821 g_free(target_environ);
822
823 if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
824 qemu_log("guest_base 0x%lx\n", guest_base);
825 log_page_dump("binary load");
826
827 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
828 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code);
829 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", info->start_code);
830 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", info->start_data);
831 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data);
832 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
833 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
834 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
835 qemu_log("argv_start 0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
836 qemu_log("env_start 0x" TARGET_ABI_FMT_lx "\n",
837 info->arg_end + (abi_ulong)sizeof(abi_ulong));
838 qemu_log("auxv_start 0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
839 }
840
841 target_set_brk(info->brk);
842 syscall_init();
843 signal_init();
844
845 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay
846 generating the prologue until now so that the prologue can take
847 the real value of GUEST_BASE into account. */
848 tcg_prologue_init(tcg_ctx);
849 tcg_region_init();
850
851 target_cpu_copy_regs(env, regs);
852
853 if (gdbstub) {
854 if (gdbserver_start(gdbstub) < 0) {
855 fprintf(stderr, "qemu: could not open gdbserver on %s\n",
856 gdbstub);
857 exit(EXIT_FAILURE);
858 }
859 gdb_handlesig(cpu, 0);
860 }
861 cpu_loop(env);
862 /* never exits */
863 return 0;
864 }