Merge remote-tracking branch 'remotes/mcayland/tags/qemu-sparc-20210412' into staging
[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 "qemu/accel.h"
24 #include "sysemu/tcg.h"
25 #include "qemu-version.h"
26 #include <sys/syscall.h>
27 #include <sys/resource.h>
28 #include <sys/shm.h>
29
30 #include "qapi/error.h"
31 #include "qemu.h"
32 #include "qemu/path.h"
33 #include "qemu/queue.h"
34 #include "qemu/config-file.h"
35 #include "qemu/cutils.h"
36 #include "qemu/error-report.h"
37 #include "qemu/help_option.h"
38 #include "qemu/module.h"
39 #include "qemu/plugin.h"
40 #include "cpu.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/guest-random.h"
46 #include "elf.h"
47 #include "trace/control.h"
48 #include "target_elf.h"
49 #include "cpu_loop-common.h"
50 #include "crypto/init.h"
51
52 char *exec_path;
53
54 int singlestep;
55 static const char *argv0;
56 static const char *gdbstub;
57 static envlist_t *envlist;
58 static const char *cpu_model;
59 static const char *cpu_type;
60 static const char *seed_optarg;
61 unsigned long mmap_min_addr;
62 uintptr_t guest_base;
63 bool have_guest_base;
64
65 /*
66 * Used to implement backwards-compatibility for the `-strace`, and
67 * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by
68 * -strace, or vice versa.
69 */
70 static bool enable_strace;
71
72 /*
73 * The last log mask given by the user in an environment variable or argument.
74 * Used to support command line arguments overriding environment variables.
75 */
76 static int last_log_mask;
77
78 /*
79 * When running 32-on-64 we should make sure we can fit all of the possible
80 * guest address space into a contiguous chunk of virtual host memory.
81 *
82 * This way we will never overlap with our own libraries or binaries or stack
83 * or anything else that QEMU maps.
84 *
85 * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
86 * of the address for the kernel. Some cpus rely on this and user space
87 * uses the high bit(s) for pointer tagging and the like. For them, we
88 * must preserve the expected address space.
89 */
90 #ifndef MAX_RESERVED_VA
91 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
92 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
93 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
94 /* There are a number of places where we assign reserved_va to a variable
95 of type abi_ulong and expect it to fit. Avoid the last page. */
96 # define MAX_RESERVED_VA(CPU) (0xfffffffful & TARGET_PAGE_MASK)
97 # else
98 # define MAX_RESERVED_VA(CPU) (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
99 # endif
100 # else
101 # define MAX_RESERVED_VA(CPU) 0
102 # endif
103 #endif
104
105 unsigned long reserved_va;
106
107 static void usage(int exitcode);
108
109 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
110 const char *qemu_uname_release;
111
112 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
113 we allocate a bigger stack. Need a better solution, for example
114 by remapping the process stack directly at the right place */
115 unsigned long guest_stack_size = 8 * 1024 * 1024UL;
116
117 #if defined(TARGET_I386)
118 int cpu_get_pic_interrupt(CPUX86State *env)
119 {
120 return -1;
121 }
122 #endif
123
124 /***********************************************************/
125 /* Helper routines for implementing atomic operations. */
126
127 /* Make sure everything is in a consistent state for calling fork(). */
128 void fork_start(void)
129 {
130 start_exclusive();
131 mmap_fork_start();
132 cpu_list_lock();
133 }
134
135 void fork_end(int child)
136 {
137 mmap_fork_end(child);
138 if (child) {
139 CPUState *cpu, *next_cpu;
140 /* Child processes created by fork() only have a single thread.
141 Discard information about the parent threads. */
142 CPU_FOREACH_SAFE(cpu, next_cpu) {
143 if (cpu != thread_cpu) {
144 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
145 }
146 }
147 qemu_init_cpu_list();
148 gdbserver_fork(thread_cpu);
149 /* qemu_init_cpu_list() takes care of reinitializing the
150 * exclusive state, so we don't need to end_exclusive() here.
151 */
152 } else {
153 cpu_list_unlock();
154 end_exclusive();
155 }
156 }
157
158 __thread CPUState *thread_cpu;
159
160 bool qemu_cpu_is_self(CPUState *cpu)
161 {
162 return thread_cpu == cpu;
163 }
164
165 void qemu_cpu_kick(CPUState *cpu)
166 {
167 cpu_exit(cpu);
168 }
169
170 void task_settid(TaskState *ts)
171 {
172 if (ts->ts_tid == 0) {
173 ts->ts_tid = (pid_t)syscall(SYS_gettid);
174 }
175 }
176
177 void stop_all_tasks(void)
178 {
179 /*
180 * We trust that when using NPTL, start_exclusive()
181 * handles thread stopping correctly.
182 */
183 start_exclusive();
184 }
185
186 /* Assumes contents are already zeroed. */
187 void init_task_state(TaskState *ts)
188 {
189 ts->used = 1;
190 ts->sigaltstack_used = (struct target_sigaltstack) {
191 .ss_sp = 0,
192 .ss_size = 0,
193 .ss_flags = TARGET_SS_DISABLE,
194 };
195 }
196
197 CPUArchState *cpu_copy(CPUArchState *env)
198 {
199 CPUState *cpu = env_cpu(env);
200 CPUState *new_cpu = cpu_create(cpu_type);
201 CPUArchState *new_env = new_cpu->env_ptr;
202 CPUBreakpoint *bp;
203 CPUWatchpoint *wp;
204
205 /* Reset non arch specific state */
206 cpu_reset(new_cpu);
207
208 memcpy(new_env, env, sizeof(CPUArchState));
209
210 /* Clone all break/watchpoints.
211 Note: Once we support ptrace with hw-debug register access, make sure
212 BP_CPU break/watchpoints are handled correctly on clone. */
213 QTAILQ_INIT(&new_cpu->breakpoints);
214 QTAILQ_INIT(&new_cpu->watchpoints);
215 QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
216 cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
217 }
218 QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
219 cpu_watchpoint_insert(new_cpu, wp->vaddr, wp->len, wp->flags, NULL);
220 }
221
222 return new_env;
223 }
224
225 static void handle_arg_help(const char *arg)
226 {
227 usage(EXIT_SUCCESS);
228 }
229
230 static void handle_arg_log(const char *arg)
231 {
232 last_log_mask = qemu_str_to_log_mask(arg);
233 if (!last_log_mask) {
234 qemu_print_log_usage(stdout);
235 exit(EXIT_FAILURE);
236 }
237 }
238
239 static void handle_arg_dfilter(const char *arg)
240 {
241 qemu_set_dfilter_ranges(arg, &error_fatal);
242 }
243
244 static void handle_arg_log_filename(const char *arg)
245 {
246 qemu_set_log_filename(arg, &error_fatal);
247 }
248
249 static void handle_arg_set_env(const char *arg)
250 {
251 char *r, *p, *token;
252 r = p = strdup(arg);
253 while ((token = strsep(&p, ",")) != NULL) {
254 if (envlist_setenv(envlist, token) != 0) {
255 usage(EXIT_FAILURE);
256 }
257 }
258 free(r);
259 }
260
261 static void handle_arg_unset_env(const char *arg)
262 {
263 char *r, *p, *token;
264 r = p = strdup(arg);
265 while ((token = strsep(&p, ",")) != NULL) {
266 if (envlist_unsetenv(envlist, token) != 0) {
267 usage(EXIT_FAILURE);
268 }
269 }
270 free(r);
271 }
272
273 static void handle_arg_argv0(const char *arg)
274 {
275 argv0 = strdup(arg);
276 }
277
278 static void handle_arg_stack_size(const char *arg)
279 {
280 char *p;
281 guest_stack_size = strtoul(arg, &p, 0);
282 if (guest_stack_size == 0) {
283 usage(EXIT_FAILURE);
284 }
285
286 if (*p == 'M') {
287 guest_stack_size *= MiB;
288 } else if (*p == 'k' || *p == 'K') {
289 guest_stack_size *= KiB;
290 }
291 }
292
293 static void handle_arg_ld_prefix(const char *arg)
294 {
295 interp_prefix = strdup(arg);
296 }
297
298 static void handle_arg_pagesize(const char *arg)
299 {
300 qemu_host_page_size = atoi(arg);
301 if (qemu_host_page_size == 0 ||
302 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
303 fprintf(stderr, "page size must be a power of two\n");
304 exit(EXIT_FAILURE);
305 }
306 }
307
308 static void handle_arg_seed(const char *arg)
309 {
310 seed_optarg = arg;
311 }
312
313 static void handle_arg_gdb(const char *arg)
314 {
315 gdbstub = g_strdup(arg);
316 }
317
318 static void handle_arg_uname(const char *arg)
319 {
320 qemu_uname_release = strdup(arg);
321 }
322
323 static void handle_arg_cpu(const char *arg)
324 {
325 cpu_model = strdup(arg);
326 if (cpu_model == NULL || is_help_option(cpu_model)) {
327 /* XXX: implement xxx_cpu_list for targets that still miss it */
328 #if defined(cpu_list)
329 cpu_list();
330 #endif
331 exit(EXIT_FAILURE);
332 }
333 }
334
335 static void handle_arg_guest_base(const char *arg)
336 {
337 guest_base = strtol(arg, NULL, 0);
338 have_guest_base = true;
339 }
340
341 static void handle_arg_reserved_va(const char *arg)
342 {
343 char *p;
344 int shift = 0;
345 reserved_va = strtoul(arg, &p, 0);
346 switch (*p) {
347 case 'k':
348 case 'K':
349 shift = 10;
350 break;
351 case 'M':
352 shift = 20;
353 break;
354 case 'G':
355 shift = 30;
356 break;
357 }
358 if (shift) {
359 unsigned long unshifted = reserved_va;
360 p++;
361 reserved_va <<= shift;
362 if (reserved_va >> shift != unshifted) {
363 fprintf(stderr, "Reserved virtual address too big\n");
364 exit(EXIT_FAILURE);
365 }
366 }
367 if (*p) {
368 fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p);
369 exit(EXIT_FAILURE);
370 }
371 }
372
373 static void handle_arg_singlestep(const char *arg)
374 {
375 singlestep = 1;
376 }
377
378 static void handle_arg_strace(const char *arg)
379 {
380 enable_strace = true;
381 }
382
383 static void handle_arg_version(const char *arg)
384 {
385 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
386 "\n" QEMU_COPYRIGHT "\n");
387 exit(EXIT_SUCCESS);
388 }
389
390 static void handle_arg_trace(const char *arg)
391 {
392 trace_opt_parse(arg);
393 }
394
395 #if defined(TARGET_XTENSA)
396 static void handle_arg_abi_call0(const char *arg)
397 {
398 xtensa_set_abi_call0();
399 }
400 #endif
401
402 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins);
403
404 #ifdef CONFIG_PLUGIN
405 static void handle_arg_plugin(const char *arg)
406 {
407 qemu_plugin_opt_parse(arg, &plugins);
408 }
409 #endif
410
411 struct qemu_argument {
412 const char *argv;
413 const char *env;
414 bool has_arg;
415 void (*handle_opt)(const char *arg);
416 const char *example;
417 const char *help;
418 };
419
420 static const struct qemu_argument arg_table[] = {
421 {"h", "", false, handle_arg_help,
422 "", "print this help"},
423 {"help", "", false, handle_arg_help,
424 "", ""},
425 {"g", "QEMU_GDB", true, handle_arg_gdb,
426 "port", "wait gdb connection to 'port'"},
427 {"L", "QEMU_LD_PREFIX", true, handle_arg_ld_prefix,
428 "path", "set the elf interpreter prefix to 'path'"},
429 {"s", "QEMU_STACK_SIZE", true, handle_arg_stack_size,
430 "size", "set the stack size to 'size' bytes"},
431 {"cpu", "QEMU_CPU", true, handle_arg_cpu,
432 "model", "select CPU (-cpu help for list)"},
433 {"E", "QEMU_SET_ENV", true, handle_arg_set_env,
434 "var=value", "sets targets environment variable (see below)"},
435 {"U", "QEMU_UNSET_ENV", true, handle_arg_unset_env,
436 "var", "unsets targets environment variable (see below)"},
437 {"0", "QEMU_ARGV0", true, handle_arg_argv0,
438 "argv0", "forces target process argv[0] to be 'argv0'"},
439 {"r", "QEMU_UNAME", true, handle_arg_uname,
440 "uname", "set qemu uname release string to 'uname'"},
441 {"B", "QEMU_GUEST_BASE", true, handle_arg_guest_base,
442 "address", "set guest_base address to 'address'"},
443 {"R", "QEMU_RESERVED_VA", true, handle_arg_reserved_va,
444 "size", "reserve 'size' bytes for guest virtual address space"},
445 {"d", "QEMU_LOG", true, handle_arg_log,
446 "item[,...]", "enable logging of specified items "
447 "(use '-d help' for a list of items)"},
448 {"dfilter", "QEMU_DFILTER", true, handle_arg_dfilter,
449 "range[,...]","filter logging based on address range"},
450 {"D", "QEMU_LOG_FILENAME", true, handle_arg_log_filename,
451 "logfile", "write logs to 'logfile' (default stderr)"},
452 {"p", "QEMU_PAGESIZE", true, handle_arg_pagesize,
453 "pagesize", "set the host page size to 'pagesize'"},
454 {"singlestep", "QEMU_SINGLESTEP", false, handle_arg_singlestep,
455 "", "run in singlestep mode"},
456 {"strace", "QEMU_STRACE", false, handle_arg_strace,
457 "", "log system calls"},
458 {"seed", "QEMU_RAND_SEED", true, handle_arg_seed,
459 "", "Seed for pseudo-random number generator"},
460 {"trace", "QEMU_TRACE", true, handle_arg_trace,
461 "", "[[enable=]<pattern>][,events=<file>][,file=<file>]"},
462 #ifdef CONFIG_PLUGIN
463 {"plugin", "QEMU_PLUGIN", true, handle_arg_plugin,
464 "", "[file=]<file>[,arg=<string>]"},
465 #endif
466 {"version", "QEMU_VERSION", false, handle_arg_version,
467 "", "display version information and exit"},
468 #if defined(TARGET_XTENSA)
469 {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0,
470 "", "assume CALL0 Xtensa ABI"},
471 #endif
472 {NULL, NULL, false, NULL, NULL, NULL}
473 };
474
475 static void usage(int exitcode)
476 {
477 const struct qemu_argument *arginfo;
478 int maxarglen;
479 int maxenvlen;
480
481 printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
482 "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n"
483 "\n"
484 "Options and associated environment variables:\n"
485 "\n");
486
487 /* Calculate column widths. We must always have at least enough space
488 * for the column header.
489 */
490 maxarglen = strlen("Argument");
491 maxenvlen = strlen("Env-variable");
492
493 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
494 int arglen = strlen(arginfo->argv);
495 if (arginfo->has_arg) {
496 arglen += strlen(arginfo->example) + 1;
497 }
498 if (strlen(arginfo->env) > maxenvlen) {
499 maxenvlen = strlen(arginfo->env);
500 }
501 if (arglen > maxarglen) {
502 maxarglen = arglen;
503 }
504 }
505
506 printf("%-*s %-*s Description\n", maxarglen+1, "Argument",
507 maxenvlen, "Env-variable");
508
509 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
510 if (arginfo->has_arg) {
511 printf("-%s %-*s %-*s %s\n", arginfo->argv,
512 (int)(maxarglen - strlen(arginfo->argv) - 1),
513 arginfo->example, maxenvlen, arginfo->env, arginfo->help);
514 } else {
515 printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
516 maxenvlen, arginfo->env,
517 arginfo->help);
518 }
519 }
520
521 printf("\n"
522 "Defaults:\n"
523 "QEMU_LD_PREFIX = %s\n"
524 "QEMU_STACK_SIZE = %ld byte\n",
525 interp_prefix,
526 guest_stack_size);
527
528 printf("\n"
529 "You can use -E and -U options or the QEMU_SET_ENV and\n"
530 "QEMU_UNSET_ENV environment variables to set and unset\n"
531 "environment variables for the target process.\n"
532 "It is possible to provide several variables by separating them\n"
533 "by commas in getsubopt(3) style. Additionally it is possible to\n"
534 "provide the -E and -U options multiple times.\n"
535 "The following lines are equivalent:\n"
536 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
537 " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n"
538 " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n"
539 "Note that if you provide several changes to a single variable\n"
540 "the last change will stay in effect.\n"
541 "\n"
542 QEMU_HELP_BOTTOM "\n");
543
544 exit(exitcode);
545 }
546
547 static int parse_args(int argc, char **argv)
548 {
549 const char *r;
550 int optind;
551 const struct qemu_argument *arginfo;
552
553 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
554 if (arginfo->env == NULL) {
555 continue;
556 }
557
558 r = getenv(arginfo->env);
559 if (r != NULL) {
560 arginfo->handle_opt(r);
561 }
562 }
563
564 optind = 1;
565 for (;;) {
566 if (optind >= argc) {
567 break;
568 }
569 r = argv[optind];
570 if (r[0] != '-') {
571 break;
572 }
573 optind++;
574 r++;
575 if (!strcmp(r, "-")) {
576 break;
577 }
578 /* Treat --foo the same as -foo. */
579 if (r[0] == '-') {
580 r++;
581 }
582
583 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
584 if (!strcmp(r, arginfo->argv)) {
585 if (arginfo->has_arg) {
586 if (optind >= argc) {
587 (void) fprintf(stderr,
588 "qemu: missing argument for option '%s'\n", r);
589 exit(EXIT_FAILURE);
590 }
591 arginfo->handle_opt(argv[optind]);
592 optind++;
593 } else {
594 arginfo->handle_opt(NULL);
595 }
596 break;
597 }
598 }
599
600 /* no option matched the current argv */
601 if (arginfo->handle_opt == NULL) {
602 (void) fprintf(stderr, "qemu: unknown option '%s'\n", r);
603 exit(EXIT_FAILURE);
604 }
605 }
606
607 if (optind >= argc) {
608 (void) fprintf(stderr, "qemu: no user program specified\n");
609 exit(EXIT_FAILURE);
610 }
611
612 exec_path = argv[optind];
613
614 return optind;
615 }
616
617 int main(int argc, char **argv, char **envp)
618 {
619 struct target_pt_regs regs1, *regs = &regs1;
620 struct image_info info1, *info = &info1;
621 struct linux_binprm bprm;
622 TaskState *ts;
623 CPUArchState *env;
624 CPUState *cpu;
625 int optind;
626 char **target_environ, **wrk;
627 char **target_argv;
628 int target_argc;
629 int i;
630 int ret;
631 int execfd;
632 int log_mask;
633 unsigned long max_reserved_va;
634
635 error_init(argv[0]);
636 module_call_init(MODULE_INIT_TRACE);
637 qemu_init_cpu_list();
638 module_call_init(MODULE_INIT_QOM);
639
640 envlist = envlist_create();
641
642 /* add current environment into the list */
643 for (wrk = environ; *wrk != NULL; wrk++) {
644 (void) envlist_setenv(envlist, *wrk);
645 }
646
647 /* Read the stack limit from the kernel. If it's "unlimited",
648 then we can do little else besides use the default. */
649 {
650 struct rlimit lim;
651 if (getrlimit(RLIMIT_STACK, &lim) == 0
652 && lim.rlim_cur != RLIM_INFINITY
653 && lim.rlim_cur == (target_long)lim.rlim_cur) {
654 guest_stack_size = lim.rlim_cur;
655 }
656 }
657
658 cpu_model = NULL;
659
660 qemu_add_opts(&qemu_trace_opts);
661 qemu_plugin_add_opts();
662
663 optind = parse_args(argc, argv);
664
665 log_mask = last_log_mask | (enable_strace ? LOG_STRACE : 0);
666 if (log_mask) {
667 qemu_log_needs_buffers();
668 qemu_set_log(log_mask);
669 }
670
671 if (!trace_init_backends()) {
672 exit(1);
673 }
674 trace_init_file();
675 qemu_plugin_load_list(&plugins, &error_fatal);
676
677 /* Zero out regs */
678 memset(regs, 0, sizeof(struct target_pt_regs));
679
680 /* Zero out image_info */
681 memset(info, 0, sizeof(struct image_info));
682
683 memset(&bprm, 0, sizeof (bprm));
684
685 /* Scan interp_prefix dir for replacement files. */
686 init_paths(interp_prefix);
687
688 init_qemu_uname_release();
689
690 execfd = qemu_getauxval(AT_EXECFD);
691 if (execfd == 0) {
692 execfd = open(exec_path, O_RDONLY);
693 if (execfd < 0) {
694 printf("Error while loading %s: %s\n", exec_path, strerror(errno));
695 _exit(EXIT_FAILURE);
696 }
697 }
698
699 if (cpu_model == NULL) {
700 cpu_model = cpu_get_model(get_elf_eflags(execfd));
701 }
702 cpu_type = parse_cpu_option(cpu_model);
703
704 /* init tcg before creating CPUs and to get qemu_host_page_size */
705 {
706 AccelClass *ac = ACCEL_GET_CLASS(current_accel());
707
708 ac->init_machine(NULL);
709 accel_init_interfaces(ac);
710 }
711 cpu = cpu_create(cpu_type);
712 env = cpu->env_ptr;
713 cpu_reset(cpu);
714 thread_cpu = cpu;
715
716 /*
717 * Reserving too much vm space via mmap can run into problems
718 * with rlimits, oom due to page table creation, etc. We will
719 * still try it, if directed by the command-line option, but
720 * not by default.
721 */
722 max_reserved_va = MAX_RESERVED_VA(cpu);
723 if (reserved_va != 0) {
724 if (max_reserved_va && reserved_va > max_reserved_va) {
725 fprintf(stderr, "Reserved virtual address too big\n");
726 exit(EXIT_FAILURE);
727 }
728 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
729 /*
730 * reserved_va must be aligned with the host page size
731 * as it is used with mmap()
732 */
733 reserved_va = max_reserved_va & qemu_host_page_mask;
734 }
735
736 {
737 Error *err = NULL;
738 if (seed_optarg != NULL) {
739 qemu_guest_random_seed_main(seed_optarg, &err);
740 } else {
741 qcrypto_init(&err);
742 }
743 if (err) {
744 error_reportf_err(err, "cannot initialize crypto: ");
745 exit(1);
746 }
747 }
748
749 target_environ = envlist_to_environ(envlist, NULL);
750 envlist_free(envlist);
751
752 /*
753 * Read in mmap_min_addr kernel parameter. This value is used
754 * When loading the ELF image to determine whether guest_base
755 * is needed. It is also used in mmap_find_vma.
756 */
757 {
758 FILE *fp;
759
760 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
761 unsigned long tmp;
762 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
763 mmap_min_addr = tmp;
764 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
765 mmap_min_addr);
766 }
767 fclose(fp);
768 }
769 }
770
771 /*
772 * We prefer to not make NULL pointers accessible to QEMU.
773 * If we're in a chroot with no /proc, fall back to 1 page.
774 */
775 if (mmap_min_addr == 0) {
776 mmap_min_addr = qemu_host_page_size;
777 qemu_log_mask(CPU_LOG_PAGE,
778 "host mmap_min_addr=0x%lx (fallback)\n",
779 mmap_min_addr);
780 }
781
782 /*
783 * Prepare copy of argv vector for target.
784 */
785 target_argc = argc - optind;
786 target_argv = calloc(target_argc + 1, sizeof (char *));
787 if (target_argv == NULL) {
788 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
789 exit(EXIT_FAILURE);
790 }
791
792 /*
793 * If argv0 is specified (using '-0' switch) we replace
794 * argv[0] pointer with the given one.
795 */
796 i = 0;
797 if (argv0 != NULL) {
798 target_argv[i++] = strdup(argv0);
799 }
800 for (; i < target_argc; i++) {
801 target_argv[i] = strdup(argv[optind + i]);
802 }
803 target_argv[target_argc] = NULL;
804
805 ts = g_new0(TaskState, 1);
806 init_task_state(ts);
807 /* build Task State */
808 ts->info = info;
809 ts->bprm = &bprm;
810 cpu->opaque = ts;
811 task_settid(ts);
812
813 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs,
814 info, &bprm);
815 if (ret != 0) {
816 printf("Error while loading %s: %s\n", exec_path, strerror(-ret));
817 _exit(EXIT_FAILURE);
818 }
819
820 for (wrk = target_environ; *wrk; wrk++) {
821 g_free(*wrk);
822 }
823
824 g_free(target_environ);
825
826 if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
827 qemu_log("guest_base %p\n", (void *)guest_base);
828 log_page_dump("binary load");
829
830 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
831 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code);
832 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", info->start_code);
833 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", info->start_data);
834 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data);
835 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
836 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
837 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
838 qemu_log("argv_start 0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
839 qemu_log("env_start 0x" TARGET_ABI_FMT_lx "\n",
840 info->arg_end + (abi_ulong)sizeof(abi_ulong));
841 qemu_log("auxv_start 0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
842 }
843
844 target_set_brk(info->brk);
845 syscall_init();
846 signal_init();
847
848 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay
849 generating the prologue until now so that the prologue can take
850 the real value of GUEST_BASE into account. */
851 tcg_prologue_init(tcg_ctx);
852 tcg_region_init();
853
854 target_cpu_copy_regs(env, regs);
855
856 if (gdbstub) {
857 if (gdbserver_start(gdbstub) < 0) {
858 fprintf(stderr, "qemu: could not open gdbserver on %s\n",
859 gdbstub);
860 exit(EXIT_FAILURE);
861 }
862 gdb_handlesig(cpu, 0);
863 }
864 cpu_loop(env);
865 /* never exits */
866 return 0;
867 }