Merge tag 'pull-target-arm-20220627' of https://git.linaro.org/people/pmaydell/qemu...
[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 #include <linux/binfmts.h>
30
31 #include "qapi/error.h"
32 #include "qemu.h"
33 #include "user-internals.h"
34 #include "qemu/path.h"
35 #include "qemu/queue.h"
36 #include "qemu/config-file.h"
37 #include "qemu/cutils.h"
38 #include "qemu/error-report.h"
39 #include "qemu/help_option.h"
40 #include "qemu/module.h"
41 #include "qemu/plugin.h"
42 #include "exec/exec-all.h"
43 #include "exec/gdbstub.h"
44 #include "tcg/tcg.h"
45 #include "qemu/timer.h"
46 #include "qemu/envlist.h"
47 #include "qemu/guest-random.h"
48 #include "elf.h"
49 #include "trace/control.h"
50 #include "target_elf.h"
51 #include "cpu_loop-common.h"
52 #include "crypto/init.h"
53 #include "fd-trans.h"
54 #include "signal-common.h"
55 #include "loader.h"
56 #include "user-mmap.h"
57
58 #ifndef AT_FLAGS_PRESERVE_ARGV0
59 #define AT_FLAGS_PRESERVE_ARGV0_BIT 0
60 #define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT)
61 #endif
62
63 char *exec_path;
64
65 int singlestep;
66 static const char *argv0;
67 static const char *gdbstub;
68 static envlist_t *envlist;
69 static const char *cpu_model;
70 static const char *cpu_type;
71 static const char *seed_optarg;
72 unsigned long mmap_min_addr;
73 uintptr_t guest_base;
74 bool have_guest_base;
75
76 /*
77 * Used to implement backwards-compatibility for the `-strace`, and
78 * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by
79 * -strace, or vice versa.
80 */
81 static bool enable_strace;
82
83 /*
84 * The last log mask given by the user in an environment variable or argument.
85 * Used to support command line arguments overriding environment variables.
86 */
87 static int last_log_mask;
88
89 /*
90 * When running 32-on-64 we should make sure we can fit all of the possible
91 * guest address space into a contiguous chunk of virtual host memory.
92 *
93 * This way we will never overlap with our own libraries or binaries or stack
94 * or anything else that QEMU maps.
95 *
96 * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
97 * of the address for the kernel. Some cpus rely on this and user space
98 * uses the high bit(s) for pointer tagging and the like. For them, we
99 * must preserve the expected address space.
100 */
101 #ifndef MAX_RESERVED_VA
102 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
103 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
104 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
105 /* There are a number of places where we assign reserved_va to a variable
106 of type abi_ulong and expect it to fit. Avoid the last page. */
107 # define MAX_RESERVED_VA(CPU) (0xfffffffful & TARGET_PAGE_MASK)
108 # else
109 # define MAX_RESERVED_VA(CPU) (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
110 # endif
111 # else
112 # define MAX_RESERVED_VA(CPU) 0
113 # endif
114 #endif
115
116 unsigned long reserved_va;
117
118 static void usage(int exitcode);
119
120 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
121 const char *qemu_uname_release;
122
123 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
124 we allocate a bigger stack. Need a better solution, for example
125 by remapping the process stack directly at the right place */
126 unsigned long guest_stack_size = 8 * 1024 * 1024UL;
127
128 /***********************************************************/
129 /* Helper routines for implementing atomic operations. */
130
131 /* Make sure everything is in a consistent state for calling fork(). */
132 void fork_start(void)
133 {
134 start_exclusive();
135 mmap_fork_start();
136 cpu_list_lock();
137 }
138
139 void fork_end(int child)
140 {
141 mmap_fork_end(child);
142 if (child) {
143 CPUState *cpu, *next_cpu;
144 /* Child processes created by fork() only have a single thread.
145 Discard information about the parent threads. */
146 CPU_FOREACH_SAFE(cpu, next_cpu) {
147 if (cpu != thread_cpu) {
148 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
149 }
150 }
151 qemu_init_cpu_list();
152 gdbserver_fork(thread_cpu);
153 /* qemu_init_cpu_list() takes care of reinitializing the
154 * exclusive state, so we don't need to end_exclusive() here.
155 */
156 } else {
157 cpu_list_unlock();
158 end_exclusive();
159 }
160 }
161
162 __thread CPUState *thread_cpu;
163
164 bool qemu_cpu_is_self(CPUState *cpu)
165 {
166 return thread_cpu == cpu;
167 }
168
169 void qemu_cpu_kick(CPUState *cpu)
170 {
171 cpu_exit(cpu);
172 }
173
174 void task_settid(TaskState *ts)
175 {
176 if (ts->ts_tid == 0) {
177 ts->ts_tid = (pid_t)syscall(SYS_gettid);
178 }
179 }
180
181 void stop_all_tasks(void)
182 {
183 /*
184 * We trust that when using NPTL, start_exclusive()
185 * handles thread stopping correctly.
186 */
187 start_exclusive();
188 }
189
190 /* Assumes contents are already zeroed. */
191 void init_task_state(TaskState *ts)
192 {
193 ts->used = 1;
194 ts->sigaltstack_used = (struct target_sigaltstack) {
195 .ss_sp = 0,
196 .ss_size = 0,
197 .ss_flags = TARGET_SS_DISABLE,
198 };
199 }
200
201 CPUArchState *cpu_copy(CPUArchState *env)
202 {
203 CPUState *cpu = env_cpu(env);
204 CPUState *new_cpu = cpu_create(cpu_type);
205 CPUArchState *new_env = new_cpu->env_ptr;
206 CPUBreakpoint *bp;
207
208 /* Reset non arch specific state */
209 cpu_reset(new_cpu);
210
211 new_cpu->tcg_cflags = cpu->tcg_cflags;
212 memcpy(new_env, env, sizeof(CPUArchState));
213
214 /* Clone all break/watchpoints.
215 Note: Once we support ptrace with hw-debug register access, make sure
216 BP_CPU break/watchpoints are handled correctly on clone. */
217 QTAILQ_INIT(&new_cpu->breakpoints);
218 QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
219 cpu_breakpoint_insert(new_cpu, bp->pc, bp->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>[,<argname>=<argvalue>]"},
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 bool preserve_argv0;
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();
676 qemu_plugin_load_list(&plugins, &error_fatal);
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 /*
692 * Manage binfmt-misc open-binary flag
693 */
694 execfd = qemu_getauxval(AT_EXECFD);
695 if (execfd == 0) {
696 execfd = open(exec_path, O_RDONLY);
697 if (execfd < 0) {
698 printf("Error while loading %s: %s\n", exec_path, strerror(errno));
699 _exit(EXIT_FAILURE);
700 }
701 }
702
703 /*
704 * get binfmt_misc flags
705 */
706 preserve_argv0 = !!(qemu_getauxval(AT_FLAGS) & AT_FLAGS_PRESERVE_ARGV0);
707
708 /*
709 * Manage binfmt-misc preserve-arg[0] flag
710 * argv[optind] full path to the binary
711 * argv[optind + 1] original argv[0]
712 */
713 if (optind + 1 < argc && preserve_argv0) {
714 optind++;
715 }
716
717 if (cpu_model == NULL) {
718 cpu_model = cpu_get_model(get_elf_eflags(execfd));
719 }
720 cpu_type = parse_cpu_option(cpu_model);
721
722 /* init tcg before creating CPUs and to get qemu_host_page_size */
723 {
724 AccelClass *ac = ACCEL_GET_CLASS(current_accel());
725
726 accel_init_interfaces(ac);
727 ac->init_machine(NULL);
728 }
729 cpu = cpu_create(cpu_type);
730 env = cpu->env_ptr;
731 cpu_reset(cpu);
732 thread_cpu = cpu;
733
734 /*
735 * Reserving too much vm space via mmap can run into problems
736 * with rlimits, oom due to page table creation, etc. We will
737 * still try it, if directed by the command-line option, but
738 * not by default.
739 */
740 max_reserved_va = MAX_RESERVED_VA(cpu);
741 if (reserved_va != 0) {
742 if (max_reserved_va && reserved_va > max_reserved_va) {
743 fprintf(stderr, "Reserved virtual address too big\n");
744 exit(EXIT_FAILURE);
745 }
746 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
747 /*
748 * reserved_va must be aligned with the host page size
749 * as it is used with mmap()
750 */
751 reserved_va = max_reserved_va & qemu_host_page_mask;
752 }
753
754 {
755 Error *err = NULL;
756 if (seed_optarg != NULL) {
757 qemu_guest_random_seed_main(seed_optarg, &err);
758 } else {
759 qcrypto_init(&err);
760 }
761 if (err) {
762 error_reportf_err(err, "cannot initialize crypto: ");
763 exit(1);
764 }
765 }
766
767 target_environ = envlist_to_environ(envlist, NULL);
768 envlist_free(envlist);
769
770 /*
771 * Read in mmap_min_addr kernel parameter. This value is used
772 * When loading the ELF image to determine whether guest_base
773 * is needed. It is also used in mmap_find_vma.
774 */
775 {
776 FILE *fp;
777
778 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
779 unsigned long tmp;
780 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
781 mmap_min_addr = tmp;
782 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
783 mmap_min_addr);
784 }
785 fclose(fp);
786 }
787 }
788
789 /*
790 * We prefer to not make NULL pointers accessible to QEMU.
791 * If we're in a chroot with no /proc, fall back to 1 page.
792 */
793 if (mmap_min_addr == 0) {
794 mmap_min_addr = qemu_host_page_size;
795 qemu_log_mask(CPU_LOG_PAGE,
796 "host mmap_min_addr=0x%lx (fallback)\n",
797 mmap_min_addr);
798 }
799
800 /*
801 * Prepare copy of argv vector for target.
802 */
803 target_argc = argc - optind;
804 target_argv = calloc(target_argc + 1, sizeof (char *));
805 if (target_argv == NULL) {
806 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
807 exit(EXIT_FAILURE);
808 }
809
810 /*
811 * If argv0 is specified (using '-0' switch) we replace
812 * argv[0] pointer with the given one.
813 */
814 i = 0;
815 if (argv0 != NULL) {
816 target_argv[i++] = strdup(argv0);
817 }
818 for (; i < target_argc; i++) {
819 target_argv[i] = strdup(argv[optind + i]);
820 }
821 target_argv[target_argc] = NULL;
822
823 ts = g_new0(TaskState, 1);
824 init_task_state(ts);
825 /* build Task State */
826 ts->info = info;
827 ts->bprm = &bprm;
828 cpu->opaque = ts;
829 task_settid(ts);
830
831 fd_trans_init();
832
833 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs,
834 info, &bprm);
835 if (ret != 0) {
836 printf("Error while loading %s: %s\n", exec_path, strerror(-ret));
837 _exit(EXIT_FAILURE);
838 }
839
840 for (wrk = target_environ; *wrk; wrk++) {
841 g_free(*wrk);
842 }
843
844 g_free(target_environ);
845
846 if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
847 qemu_log("guest_base %p\n", (void *)guest_base);
848 log_page_dump("binary load");
849
850 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
851 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code);
852 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", info->start_code);
853 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", info->start_data);
854 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data);
855 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
856 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
857 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
858 qemu_log("argv_start 0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
859 qemu_log("env_start 0x" TARGET_ABI_FMT_lx "\n",
860 info->arg_end + (abi_ulong)sizeof(abi_ulong));
861 qemu_log("auxv_start 0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
862 }
863
864 target_set_brk(info->brk);
865 syscall_init();
866 signal_init();
867
868 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay
869 generating the prologue until now so that the prologue can take
870 the real value of GUEST_BASE into account. */
871 tcg_prologue_init(tcg_ctx);
872
873 target_cpu_copy_regs(env, regs);
874
875 if (gdbstub) {
876 if (gdbserver_start(gdbstub) < 0) {
877 fprintf(stderr, "qemu: could not open gdbserver on %s\n",
878 gdbstub);
879 exit(EXIT_FAILURE);
880 }
881 gdb_handlesig(cpu, 0);
882 }
883 cpu_loop(env);
884 /* never exits */
885 return 0;
886 }