i386: Fix pkg_id offset for EPYC cpu models
[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
28 #include "qapi/error.h"
29 #include "qemu.h"
30 #include "qemu/path.h"
31 #include "qemu/queue.h"
32 #include "qemu/config-file.h"
33 #include "qemu/cutils.h"
34 #include "qemu/error-report.h"
35 #include "qemu/help_option.h"
36 #include "qemu/module.h"
37 #include "qemu/plugin.h"
38 #include "cpu.h"
39 #include "exec/exec-all.h"
40 #include "tcg/tcg.h"
41 #include "qemu/timer.h"
42 #include "qemu/envlist.h"
43 #include "qemu/guest-random.h"
44 #include "elf.h"
45 #include "trace/control.h"
46 #include "target_elf.h"
47 #include "cpu_loop-common.h"
48 #include "crypto/init.h"
49
50 char *exec_path;
51
52 int singlestep;
53 static const char *argv0;
54 static int gdbstub_port;
55 static envlist_t *envlist;
56 static const char *cpu_model;
57 static const char *cpu_type;
58 static const char *seed_optarg;
59 unsigned long mmap_min_addr;
60 unsigned long guest_base;
61 int have_guest_base;
62
63 /*
64 * Used to implement backwards-compatibility for the `-strace`, and
65 * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by
66 * -strace, or vice versa.
67 */
68 static bool enable_strace;
69
70 /*
71 * The last log mask given by the user in an environment variable or argument.
72 * Used to support command line arguments overriding environment variables.
73 */
74 static int last_log_mask;
75
76 /*
77 * When running 32-on-64 we should make sure we can fit all of the possible
78 * guest address space into a contiguous chunk of virtual host memory.
79 *
80 * This way we will never overlap with our own libraries or binaries or stack
81 * or anything else that QEMU maps.
82 *
83 * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
84 * of the address for the kernel. Some cpus rely on this and user space
85 * uses the high bit(s) for pointer tagging and the like. For them, we
86 * must preserve the expected address space.
87 */
88 #ifndef MAX_RESERVED_VA
89 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
90 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
91 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
92 /* There are a number of places where we assign reserved_va to a variable
93 of type abi_ulong and expect it to fit. Avoid the last page. */
94 # define MAX_RESERVED_VA(CPU) (0xfffffffful & TARGET_PAGE_MASK)
95 # else
96 # define MAX_RESERVED_VA(CPU) (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
97 # endif
98 # else
99 # define MAX_RESERVED_VA(CPU) 0
100 # endif
101 #endif
102
103 unsigned long reserved_va;
104
105 static void usage(int exitcode);
106
107 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
108 const char *qemu_uname_release;
109
110 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
111 we allocate a bigger stack. Need a better solution, for example
112 by remapping the process stack directly at the right place */
113 unsigned long guest_stack_size = 8 * 1024 * 1024UL;
114
115 #if defined(TARGET_I386)
116 int cpu_get_pic_interrupt(CPUX86State *env)
117 {
118 return -1;
119 }
120 #endif
121
122 /***********************************************************/
123 /* Helper routines for implementing atomic operations. */
124
125 /* Make sure everything is in a consistent state for calling fork(). */
126 void fork_start(void)
127 {
128 start_exclusive();
129 mmap_fork_start();
130 cpu_list_lock();
131 }
132
133 void fork_end(int child)
134 {
135 mmap_fork_end(child);
136 if (child) {
137 CPUState *cpu, *next_cpu;
138 /* Child processes created by fork() only have a single thread.
139 Discard information about the parent threads. */
140 CPU_FOREACH_SAFE(cpu, next_cpu) {
141 if (cpu != thread_cpu) {
142 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
143 }
144 }
145 qemu_init_cpu_list();
146 gdbserver_fork(thread_cpu);
147 /* qemu_init_cpu_list() takes care of reinitializing the
148 * exclusive state, so we don't need to end_exclusive() here.
149 */
150 } else {
151 cpu_list_unlock();
152 end_exclusive();
153 }
154 }
155
156 __thread CPUState *thread_cpu;
157
158 bool qemu_cpu_is_self(CPUState *cpu)
159 {
160 return thread_cpu == cpu;
161 }
162
163 void qemu_cpu_kick(CPUState *cpu)
164 {
165 cpu_exit(cpu);
166 }
167
168 void task_settid(TaskState *ts)
169 {
170 if (ts->ts_tid == 0) {
171 ts->ts_tid = (pid_t)syscall(SYS_gettid);
172 }
173 }
174
175 void stop_all_tasks(void)
176 {
177 /*
178 * We trust that when using NPTL, start_exclusive()
179 * handles thread stopping correctly.
180 */
181 start_exclusive();
182 }
183
184 /* Assumes contents are already zeroed. */
185 void init_task_state(TaskState *ts)
186 {
187 ts->used = 1;
188 ts->sigaltstack_used = (struct target_sigaltstack) {
189 .ss_sp = 0,
190 .ss_size = 0,
191 .ss_flags = TARGET_SS_DISABLE,
192 };
193 }
194
195 CPUArchState *cpu_copy(CPUArchState *env)
196 {
197 CPUState *cpu = env_cpu(env);
198 CPUState *new_cpu = cpu_create(cpu_type);
199 CPUArchState *new_env = new_cpu->env_ptr;
200 CPUBreakpoint *bp;
201 CPUWatchpoint *wp;
202
203 /* Reset non arch specific state */
204 cpu_reset(new_cpu);
205
206 memcpy(new_env, env, sizeof(CPUArchState));
207
208 /* Clone all break/watchpoints.
209 Note: Once we support ptrace with hw-debug register access, make sure
210 BP_CPU break/watchpoints are handled correctly on clone. */
211 QTAILQ_INIT(&new_cpu->breakpoints);
212 QTAILQ_INIT(&new_cpu->watchpoints);
213 QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
214 cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
215 }
216 QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
217 cpu_watchpoint_insert(new_cpu, wp->vaddr, wp->len, wp->flags, NULL);
218 }
219
220 return new_env;
221 }
222
223 static void handle_arg_help(const char *arg)
224 {
225 usage(EXIT_SUCCESS);
226 }
227
228 static void handle_arg_log(const char *arg)
229 {
230 last_log_mask = qemu_str_to_log_mask(arg);
231 if (!last_log_mask) {
232 qemu_print_log_usage(stdout);
233 exit(EXIT_FAILURE);
234 }
235 }
236
237 static void handle_arg_dfilter(const char *arg)
238 {
239 qemu_set_dfilter_ranges(arg, &error_fatal);
240 }
241
242 static void handle_arg_log_filename(const char *arg)
243 {
244 qemu_set_log_filename(arg, &error_fatal);
245 }
246
247 static void handle_arg_set_env(const char *arg)
248 {
249 char *r, *p, *token;
250 r = p = strdup(arg);
251 while ((token = strsep(&p, ",")) != NULL) {
252 if (envlist_setenv(envlist, token) != 0) {
253 usage(EXIT_FAILURE);
254 }
255 }
256 free(r);
257 }
258
259 static void handle_arg_unset_env(const char *arg)
260 {
261 char *r, *p, *token;
262 r = p = strdup(arg);
263 while ((token = strsep(&p, ",")) != NULL) {
264 if (envlist_unsetenv(envlist, token) != 0) {
265 usage(EXIT_FAILURE);
266 }
267 }
268 free(r);
269 }
270
271 static void handle_arg_argv0(const char *arg)
272 {
273 argv0 = strdup(arg);
274 }
275
276 static void handle_arg_stack_size(const char *arg)
277 {
278 char *p;
279 guest_stack_size = strtoul(arg, &p, 0);
280 if (guest_stack_size == 0) {
281 usage(EXIT_FAILURE);
282 }
283
284 if (*p == 'M') {
285 guest_stack_size *= MiB;
286 } else if (*p == 'k' || *p == 'K') {
287 guest_stack_size *= KiB;
288 }
289 }
290
291 static void handle_arg_ld_prefix(const char *arg)
292 {
293 interp_prefix = strdup(arg);
294 }
295
296 static void handle_arg_pagesize(const char *arg)
297 {
298 qemu_host_page_size = atoi(arg);
299 if (qemu_host_page_size == 0 ||
300 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
301 fprintf(stderr, "page size must be a power of two\n");
302 exit(EXIT_FAILURE);
303 }
304 }
305
306 static void handle_arg_seed(const char *arg)
307 {
308 seed_optarg = arg;
309 }
310
311 static void handle_arg_gdb(const char *arg)
312 {
313 gdbstub_port = atoi(arg);
314 }
315
316 static void handle_arg_uname(const char *arg)
317 {
318 qemu_uname_release = strdup(arg);
319 }
320
321 static void handle_arg_cpu(const char *arg)
322 {
323 cpu_model = strdup(arg);
324 if (cpu_model == NULL || is_help_option(cpu_model)) {
325 /* XXX: implement xxx_cpu_list for targets that still miss it */
326 #if defined(cpu_list)
327 cpu_list();
328 #endif
329 exit(EXIT_FAILURE);
330 }
331 }
332
333 static void handle_arg_guest_base(const char *arg)
334 {
335 guest_base = strtol(arg, NULL, 0);
336 have_guest_base = 1;
337 }
338
339 static void handle_arg_reserved_va(const char *arg)
340 {
341 char *p;
342 int shift = 0;
343 reserved_va = strtoul(arg, &p, 0);
344 switch (*p) {
345 case 'k':
346 case 'K':
347 shift = 10;
348 break;
349 case 'M':
350 shift = 20;
351 break;
352 case 'G':
353 shift = 30;
354 break;
355 }
356 if (shift) {
357 unsigned long unshifted = reserved_va;
358 p++;
359 reserved_va <<= shift;
360 if (reserved_va >> shift != unshifted) {
361 fprintf(stderr, "Reserved virtual address too big\n");
362 exit(EXIT_FAILURE);
363 }
364 }
365 if (*p) {
366 fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p);
367 exit(EXIT_FAILURE);
368 }
369 }
370
371 static void handle_arg_singlestep(const char *arg)
372 {
373 singlestep = 1;
374 }
375
376 static void handle_arg_strace(const char *arg)
377 {
378 enable_strace = true;
379 }
380
381 static void handle_arg_version(const char *arg)
382 {
383 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
384 "\n" QEMU_COPYRIGHT "\n");
385 exit(EXIT_SUCCESS);
386 }
387
388 static char *trace_file;
389 static void handle_arg_trace(const char *arg)
390 {
391 g_free(trace_file);
392 trace_file = 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(trace_file);
675 if (qemu_plugin_load_list(&plugins)) {
676 exit(1);
677 }
678
679 /* Zero out regs */
680 memset(regs, 0, sizeof(struct target_pt_regs));
681
682 /* Zero out image_info */
683 memset(info, 0, sizeof(struct image_info));
684
685 memset(&bprm, 0, sizeof (bprm));
686
687 /* Scan interp_prefix dir for replacement files. */
688 init_paths(interp_prefix);
689
690 init_qemu_uname_release();
691
692 execfd = qemu_getauxval(AT_EXECFD);
693 if (execfd == 0) {
694 execfd = open(exec_path, O_RDONLY);
695 if (execfd < 0) {
696 printf("Error while loading %s: %s\n", exec_path, strerror(errno));
697 _exit(EXIT_FAILURE);
698 }
699 }
700
701 if (cpu_model == NULL) {
702 cpu_model = cpu_get_model(get_elf_eflags(execfd));
703 }
704 cpu_type = parse_cpu_option(cpu_model);
705
706 /* init tcg before creating CPUs and to get qemu_host_page_size */
707 tcg_exec_init(0);
708
709 cpu = cpu_create(cpu_type);
710 env = cpu->env_ptr;
711 cpu_reset(cpu);
712 thread_cpu = cpu;
713
714 /*
715 * Reserving too much vm space via mmap can run into problems
716 * with rlimits, oom due to page table creation, etc. We will
717 * still try it, if directed by the command-line option, but
718 * not by default.
719 */
720 max_reserved_va = MAX_RESERVED_VA(cpu);
721 if (reserved_va != 0) {
722 if (max_reserved_va && reserved_va > max_reserved_va) {
723 fprintf(stderr, "Reserved virtual address too big\n");
724 exit(EXIT_FAILURE);
725 }
726 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
727 /*
728 * reserved_va must be aligned with the host page size
729 * as it is used with mmap()
730 */
731 reserved_va = max_reserved_va & qemu_host_page_mask;
732 }
733
734 {
735 Error *err = NULL;
736 if (seed_optarg != NULL) {
737 qemu_guest_random_seed_main(seed_optarg, &err);
738 } else {
739 qcrypto_init(&err);
740 }
741 if (err) {
742 error_reportf_err(err, "cannot initialize crypto: ");
743 exit(1);
744 }
745 }
746
747 target_environ = envlist_to_environ(envlist, NULL);
748 envlist_free(envlist);
749
750 /*
751 * Now that page sizes are configured in tcg_exec_init() we can do
752 * proper page alignment for guest_base.
753 */
754 guest_base = HOST_PAGE_ALIGN(guest_base);
755
756 if (reserved_va || have_guest_base) {
757 guest_base = init_guest_space(guest_base, reserved_va, 0,
758 have_guest_base);
759 if (guest_base == (unsigned long)-1) {
760 fprintf(stderr, "Unable to reserve 0x%lx bytes of virtual address "
761 "space for use as guest address space (check your virtual "
762 "memory ulimit setting or reserve less using -R option)\n",
763 reserved_va);
764 exit(EXIT_FAILURE);
765 }
766
767 if (reserved_va) {
768 mmap_next_start = reserved_va;
769 }
770 }
771
772 /*
773 * Read in mmap_min_addr kernel parameter. This value is used
774 * When loading the ELF image to determine whether guest_base
775 * is needed. It is also used in mmap_find_vma.
776 */
777 {
778 FILE *fp;
779
780 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
781 unsigned long tmp;
782 if (fscanf(fp, "%lu", &tmp) == 1) {
783 mmap_min_addr = tmp;
784 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n", mmap_min_addr);
785 }
786 fclose(fp);
787 }
788 }
789
790 /*
791 * Prepare copy of argv vector for target.
792 */
793 target_argc = argc - optind;
794 target_argv = calloc(target_argc + 1, sizeof (char *));
795 if (target_argv == NULL) {
796 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
797 exit(EXIT_FAILURE);
798 }
799
800 /*
801 * If argv0 is specified (using '-0' switch) we replace
802 * argv[0] pointer with the given one.
803 */
804 i = 0;
805 if (argv0 != NULL) {
806 target_argv[i++] = strdup(argv0);
807 }
808 for (; i < target_argc; i++) {
809 target_argv[i] = strdup(argv[optind + i]);
810 }
811 target_argv[target_argc] = NULL;
812
813 ts = g_new0(TaskState, 1);
814 init_task_state(ts);
815 /* build Task State */
816 ts->info = info;
817 ts->bprm = &bprm;
818 cpu->opaque = ts;
819 task_settid(ts);
820
821 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs,
822 info, &bprm);
823 if (ret != 0) {
824 printf("Error while loading %s: %s\n", exec_path, strerror(-ret));
825 _exit(EXIT_FAILURE);
826 }
827
828 for (wrk = target_environ; *wrk; wrk++) {
829 g_free(*wrk);
830 }
831
832 g_free(target_environ);
833
834 if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
835 qemu_log("guest_base 0x%lx\n", guest_base);
836 log_page_dump("binary load");
837
838 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
839 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code);
840 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", info->start_code);
841 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", info->start_data);
842 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data);
843 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
844 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
845 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
846 qemu_log("argv_start 0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
847 qemu_log("env_start 0x" TARGET_ABI_FMT_lx "\n",
848 info->arg_end + (abi_ulong)sizeof(abi_ulong));
849 qemu_log("auxv_start 0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
850 }
851
852 target_set_brk(info->brk);
853 syscall_init();
854 signal_init();
855
856 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay
857 generating the prologue until now so that the prologue can take
858 the real value of GUEST_BASE into account. */
859 tcg_prologue_init(tcg_ctx);
860 tcg_region_init();
861
862 target_cpu_copy_regs(env, regs);
863
864 if (gdbstub_port) {
865 if (gdbserver_start(gdbstub_port) < 0) {
866 fprintf(stderr, "qemu: could not open gdbserver on port %d\n",
867 gdbstub_port);
868 exit(EXIT_FAILURE);
869 }
870 gdb_handlesig(cpu, 0);
871 }
872 cpu_loop(env);
873 /* never exits */
874 return 0;
875 }