qga/qapi-schema: Delete useless "Returns" sections
[qemu/kevin.git] / linux-user / main.c
blob74b2fbb39386b3ab96fa8e00236f25b42725a9dd
1 /*
2 * qemu user main
4 * Copyright (c) 2003-2008 Fabrice Bellard
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.
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.
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/>.
20 #include "qemu/osdep.h"
21 #include "qemu/help-texts.h"
22 #include "qemu/units.h"
23 #include "qemu/accel.h"
24 #include "qemu-version.h"
25 #include <sys/syscall.h>
26 #include <sys/resource.h>
27 #include <sys/shm.h>
28 #include <linux/binfmts.h>
30 #include "qapi/error.h"
31 #include "qemu.h"
32 #include "user-internals.h"
33 #include "qemu/path.h"
34 #include "qemu/queue.h"
35 #include "qemu/config-file.h"
36 #include "qemu/cutils.h"
37 #include "qemu/error-report.h"
38 #include "qemu/help_option.h"
39 #include "qemu/module.h"
40 #include "qemu/plugin.h"
41 #include "exec/exec-all.h"
42 #include "exec/gdbstub.h"
43 #include "gdbstub/user.h"
44 #include "tcg/startup.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 #include "tcg/perf.h"
59 #ifdef CONFIG_SEMIHOSTING
60 #include "semihosting/semihost.h"
61 #endif
63 #ifndef AT_FLAGS_PRESERVE_ARGV0
64 #define AT_FLAGS_PRESERVE_ARGV0_BIT 0
65 #define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT)
66 #endif
68 char *exec_path;
69 char real_exec_path[PATH_MAX];
71 static bool opt_one_insn_per_tb;
72 static const char *argv0;
73 static const char *gdbstub;
74 static envlist_t *envlist;
75 static const char *cpu_model;
76 static const char *cpu_type;
77 static const char *seed_optarg;
78 unsigned long mmap_min_addr;
79 uintptr_t guest_base;
80 bool have_guest_base;
83 * Used to implement backwards-compatibility for the `-strace`, and
84 * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by
85 * -strace, or vice versa.
87 static bool enable_strace;
90 * The last log mask given by the user in an environment variable or argument.
91 * Used to support command line arguments overriding environment variables.
93 static int last_log_mask;
94 static const char *last_log_filename;
97 * When running 32-on-64 we should make sure we can fit all of the possible
98 * guest address space into a contiguous chunk of virtual host memory.
100 * This way we will never overlap with our own libraries or binaries or stack
101 * or anything else that QEMU maps.
103 * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
104 * of the address for the kernel. Some cpus rely on this and user space
105 * uses the high bit(s) for pointer tagging and the like. For them, we
106 * must preserve the expected address space.
108 #ifndef MAX_RESERVED_VA
109 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
110 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
111 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
112 # define MAX_RESERVED_VA(CPU) 0xfffffffful
113 # else
114 # define MAX_RESERVED_VA(CPU) ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
115 # endif
116 # else
117 # define MAX_RESERVED_VA(CPU) 0
118 # endif
119 #endif
121 unsigned long reserved_va;
123 static void usage(int exitcode);
125 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
126 const char *qemu_uname_release;
128 #if !defined(TARGET_DEFAULT_STACK_SIZE)
129 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
130 we allocate a bigger stack. Need a better solution, for example
131 by remapping the process stack directly at the right place */
132 #define TARGET_DEFAULT_STACK_SIZE 8 * 1024 * 1024UL
133 #endif
135 unsigned long guest_stack_size = TARGET_DEFAULT_STACK_SIZE;
137 /***********************************************************/
138 /* Helper routines for implementing atomic operations. */
140 /* Make sure everything is in a consistent state for calling fork(). */
141 void fork_start(void)
143 start_exclusive();
144 mmap_fork_start();
145 cpu_list_lock();
146 qemu_plugin_user_prefork_lock();
149 void fork_end(int child)
151 qemu_plugin_user_postfork(child);
152 mmap_fork_end(child);
153 if (child) {
154 CPUState *cpu, *next_cpu;
155 /* Child processes created by fork() only have a single thread.
156 Discard information about the parent threads. */
157 CPU_FOREACH_SAFE(cpu, next_cpu) {
158 if (cpu != thread_cpu) {
159 QTAILQ_REMOVE_RCU(&cpus_queue, cpu, node);
162 qemu_init_cpu_list();
163 gdbserver_fork(thread_cpu);
164 } else {
165 cpu_list_unlock();
168 * qemu_init_cpu_list() reinitialized the child exclusive state, but we
169 * also need to keep current_cpu consistent, so call end_exclusive() for
170 * both child and parent.
172 end_exclusive();
175 __thread CPUState *thread_cpu;
177 bool qemu_cpu_is_self(CPUState *cpu)
179 return thread_cpu == cpu;
182 void qemu_cpu_kick(CPUState *cpu)
184 cpu_exit(cpu);
187 void task_settid(TaskState *ts)
189 if (ts->ts_tid == 0) {
190 ts->ts_tid = (pid_t)syscall(SYS_gettid);
194 void stop_all_tasks(void)
197 * We trust that when using NPTL, start_exclusive()
198 * handles thread stopping correctly.
200 start_exclusive();
203 /* Assumes contents are already zeroed. */
204 void init_task_state(TaskState *ts)
206 long ticks_per_sec;
207 struct timespec bt;
209 ts->used = 1;
210 ts->sigaltstack_used = (struct target_sigaltstack) {
211 .ss_sp = 0,
212 .ss_size = 0,
213 .ss_flags = TARGET_SS_DISABLE,
216 /* Capture task start time relative to system boot */
218 ticks_per_sec = sysconf(_SC_CLK_TCK);
220 if ((ticks_per_sec > 0) && !clock_gettime(CLOCK_BOOTTIME, &bt)) {
221 /* start_boottime is expressed in clock ticks */
222 ts->start_boottime = bt.tv_sec * (uint64_t) ticks_per_sec;
223 ts->start_boottime += bt.tv_nsec * (uint64_t) ticks_per_sec /
224 NANOSECONDS_PER_SECOND;
228 CPUArchState *cpu_copy(CPUArchState *env)
230 CPUState *cpu = env_cpu(env);
231 CPUState *new_cpu = cpu_create(cpu_type);
232 CPUArchState *new_env = cpu_env(new_cpu);
233 CPUBreakpoint *bp;
235 /* Reset non arch specific state */
236 cpu_reset(new_cpu);
238 new_cpu->tcg_cflags = cpu->tcg_cflags;
239 memcpy(new_env, env, sizeof(CPUArchState));
240 #if defined(TARGET_I386) || defined(TARGET_X86_64)
241 new_env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES,
242 PROT_READ | PROT_WRITE,
243 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
244 memcpy(g2h_untagged(new_env->gdt.base), g2h_untagged(env->gdt.base),
245 sizeof(uint64_t) * TARGET_GDT_ENTRIES);
246 OBJECT(new_cpu)->free = OBJECT(cpu)->free;
247 #endif
249 /* Clone all break/watchpoints.
250 Note: Once we support ptrace with hw-debug register access, make sure
251 BP_CPU break/watchpoints are handled correctly on clone. */
252 QTAILQ_INIT(&new_cpu->breakpoints);
253 QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
254 cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
257 return new_env;
260 static void handle_arg_help(const char *arg)
262 usage(EXIT_SUCCESS);
265 static void handle_arg_log(const char *arg)
267 last_log_mask = qemu_str_to_log_mask(arg);
268 if (!last_log_mask) {
269 qemu_print_log_usage(stdout);
270 exit(EXIT_FAILURE);
274 static void handle_arg_dfilter(const char *arg)
276 qemu_set_dfilter_ranges(arg, &error_fatal);
279 static void handle_arg_log_filename(const char *arg)
281 last_log_filename = arg;
284 static void handle_arg_set_env(const char *arg)
286 char *r, *p, *token;
287 r = p = strdup(arg);
288 while ((token = strsep(&p, ",")) != NULL) {
289 if (envlist_setenv(envlist, token) != 0) {
290 usage(EXIT_FAILURE);
293 free(r);
296 static void handle_arg_unset_env(const char *arg)
298 char *r, *p, *token;
299 r = p = strdup(arg);
300 while ((token = strsep(&p, ",")) != NULL) {
301 if (envlist_unsetenv(envlist, token) != 0) {
302 usage(EXIT_FAILURE);
305 free(r);
308 static void handle_arg_argv0(const char *arg)
310 argv0 = strdup(arg);
313 static void handle_arg_stack_size(const char *arg)
315 char *p;
316 guest_stack_size = strtoul(arg, &p, 0);
317 if (guest_stack_size == 0) {
318 usage(EXIT_FAILURE);
321 if (*p == 'M') {
322 guest_stack_size *= MiB;
323 } else if (*p == 'k' || *p == 'K') {
324 guest_stack_size *= KiB;
328 static void handle_arg_ld_prefix(const char *arg)
330 interp_prefix = strdup(arg);
333 static void handle_arg_pagesize(const char *arg)
335 qemu_host_page_size = atoi(arg);
336 if (qemu_host_page_size == 0 ||
337 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
338 fprintf(stderr, "page size must be a power of two\n");
339 exit(EXIT_FAILURE);
343 static void handle_arg_seed(const char *arg)
345 seed_optarg = arg;
348 static void handle_arg_gdb(const char *arg)
350 gdbstub = g_strdup(arg);
353 static void handle_arg_uname(const char *arg)
355 qemu_uname_release = strdup(arg);
358 static void handle_arg_cpu(const char *arg)
360 cpu_model = strdup(arg);
361 if (cpu_model == NULL || is_help_option(cpu_model)) {
362 list_cpus();
363 exit(EXIT_FAILURE);
367 static void handle_arg_guest_base(const char *arg)
369 guest_base = strtol(arg, NULL, 0);
370 have_guest_base = true;
373 static void handle_arg_reserved_va(const char *arg)
375 char *p;
376 int shift = 0;
377 unsigned long val;
379 val = strtoul(arg, &p, 0);
380 switch (*p) {
381 case 'k':
382 case 'K':
383 shift = 10;
384 break;
385 case 'M':
386 shift = 20;
387 break;
388 case 'G':
389 shift = 30;
390 break;
392 if (shift) {
393 unsigned long unshifted = val;
394 p++;
395 val <<= shift;
396 if (val >> shift != unshifted) {
397 fprintf(stderr, "Reserved virtual address too big\n");
398 exit(EXIT_FAILURE);
401 if (*p) {
402 fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p);
403 exit(EXIT_FAILURE);
405 /* The representation is size - 1, with 0 remaining "default". */
406 reserved_va = val ? val - 1 : 0;
409 static void handle_arg_one_insn_per_tb(const char *arg)
411 opt_one_insn_per_tb = true;
414 static void handle_arg_strace(const char *arg)
416 enable_strace = true;
419 static void handle_arg_version(const char *arg)
421 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
422 "\n" QEMU_COPYRIGHT "\n");
423 exit(EXIT_SUCCESS);
426 static void handle_arg_trace(const char *arg)
428 trace_opt_parse(arg);
431 #if defined(TARGET_XTENSA)
432 static void handle_arg_abi_call0(const char *arg)
434 xtensa_set_abi_call0();
436 #endif
438 static void handle_arg_perfmap(const char *arg)
440 perf_enable_perfmap();
443 static void handle_arg_jitdump(const char *arg)
445 perf_enable_jitdump();
448 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins);
450 #ifdef CONFIG_PLUGIN
451 static void handle_arg_plugin(const char *arg)
453 qemu_plugin_opt_parse(arg, &plugins);
455 #endif
457 struct qemu_argument {
458 const char *argv;
459 const char *env;
460 bool has_arg;
461 void (*handle_opt)(const char *arg);
462 const char *example;
463 const char *help;
466 static const struct qemu_argument arg_table[] = {
467 {"h", "", false, handle_arg_help,
468 "", "print this help"},
469 {"help", "", false, handle_arg_help,
470 "", ""},
471 {"g", "QEMU_GDB", true, handle_arg_gdb,
472 "port", "wait gdb connection to 'port'"},
473 {"L", "QEMU_LD_PREFIX", true, handle_arg_ld_prefix,
474 "path", "set the elf interpreter prefix to 'path'"},
475 {"s", "QEMU_STACK_SIZE", true, handle_arg_stack_size,
476 "size", "set the stack size to 'size' bytes"},
477 {"cpu", "QEMU_CPU", true, handle_arg_cpu,
478 "model", "select CPU (-cpu help for list)"},
479 {"E", "QEMU_SET_ENV", true, handle_arg_set_env,
480 "var=value", "sets targets environment variable (see below)"},
481 {"U", "QEMU_UNSET_ENV", true, handle_arg_unset_env,
482 "var", "unsets targets environment variable (see below)"},
483 {"0", "QEMU_ARGV0", true, handle_arg_argv0,
484 "argv0", "forces target process argv[0] to be 'argv0'"},
485 {"r", "QEMU_UNAME", true, handle_arg_uname,
486 "uname", "set qemu uname release string to 'uname'"},
487 {"B", "QEMU_GUEST_BASE", true, handle_arg_guest_base,
488 "address", "set guest_base address to 'address'"},
489 {"R", "QEMU_RESERVED_VA", true, handle_arg_reserved_va,
490 "size", "reserve 'size' bytes for guest virtual address space"},
491 {"d", "QEMU_LOG", true, handle_arg_log,
492 "item[,...]", "enable logging of specified items "
493 "(use '-d help' for a list of items)"},
494 {"dfilter", "QEMU_DFILTER", true, handle_arg_dfilter,
495 "range[,...]","filter logging based on address range"},
496 {"D", "QEMU_LOG_FILENAME", true, handle_arg_log_filename,
497 "logfile", "write logs to 'logfile' (default stderr)"},
498 {"p", "QEMU_PAGESIZE", true, handle_arg_pagesize,
499 "pagesize", "set the host page size to 'pagesize'"},
500 {"one-insn-per-tb",
501 "QEMU_ONE_INSN_PER_TB", false, handle_arg_one_insn_per_tb,
502 "", "run with one guest instruction per emulated TB"},
503 {"strace", "QEMU_STRACE", false, handle_arg_strace,
504 "", "log system calls"},
505 {"seed", "QEMU_RAND_SEED", true, handle_arg_seed,
506 "", "Seed for pseudo-random number generator"},
507 {"trace", "QEMU_TRACE", true, handle_arg_trace,
508 "", "[[enable=]<pattern>][,events=<file>][,file=<file>]"},
509 #ifdef CONFIG_PLUGIN
510 {"plugin", "QEMU_PLUGIN", true, handle_arg_plugin,
511 "", "[file=]<file>[,<argname>=<argvalue>]"},
512 #endif
513 {"version", "QEMU_VERSION", false, handle_arg_version,
514 "", "display version information and exit"},
515 #if defined(TARGET_XTENSA)
516 {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0,
517 "", "assume CALL0 Xtensa ABI"},
518 #endif
519 {"perfmap", "QEMU_PERFMAP", false, handle_arg_perfmap,
520 "", "Generate a /tmp/perf-${pid}.map file for perf"},
521 {"jitdump", "QEMU_JITDUMP", false, handle_arg_jitdump,
522 "", "Generate a jit-${pid}.dump file for perf"},
523 {NULL, NULL, false, NULL, NULL, NULL}
526 static void usage(int exitcode)
528 const struct qemu_argument *arginfo;
529 int maxarglen;
530 int maxenvlen;
532 printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
533 "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n"
534 "\n"
535 "Options and associated environment variables:\n"
536 "\n");
538 /* Calculate column widths. We must always have at least enough space
539 * for the column header.
541 maxarglen = strlen("Argument");
542 maxenvlen = strlen("Env-variable");
544 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
545 int arglen = strlen(arginfo->argv);
546 if (arginfo->has_arg) {
547 arglen += strlen(arginfo->example) + 1;
549 if (strlen(arginfo->env) > maxenvlen) {
550 maxenvlen = strlen(arginfo->env);
552 if (arglen > maxarglen) {
553 maxarglen = arglen;
557 printf("%-*s %-*s Description\n", maxarglen+1, "Argument",
558 maxenvlen, "Env-variable");
560 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
561 if (arginfo->has_arg) {
562 printf("-%s %-*s %-*s %s\n", arginfo->argv,
563 (int)(maxarglen - strlen(arginfo->argv) - 1),
564 arginfo->example, maxenvlen, arginfo->env, arginfo->help);
565 } else {
566 printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
567 maxenvlen, arginfo->env,
568 arginfo->help);
572 printf("\n"
573 "Defaults:\n"
574 "QEMU_LD_PREFIX = %s\n"
575 "QEMU_STACK_SIZE = %ld byte\n",
576 interp_prefix,
577 guest_stack_size);
579 printf("\n"
580 "You can use -E and -U options or the QEMU_SET_ENV and\n"
581 "QEMU_UNSET_ENV environment variables to set and unset\n"
582 "environment variables for the target process.\n"
583 "It is possible to provide several variables by separating them\n"
584 "by commas in getsubopt(3) style. Additionally it is possible to\n"
585 "provide the -E and -U options multiple times.\n"
586 "The following lines are equivalent:\n"
587 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
588 " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n"
589 " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n"
590 "Note that if you provide several changes to a single variable\n"
591 "the last change will stay in effect.\n"
592 "\n"
593 QEMU_HELP_BOTTOM "\n");
595 exit(exitcode);
598 static int parse_args(int argc, char **argv)
600 const char *r;
601 int optind;
602 const struct qemu_argument *arginfo;
604 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
605 if (arginfo->env == NULL) {
606 continue;
609 r = getenv(arginfo->env);
610 if (r != NULL) {
611 arginfo->handle_opt(r);
615 optind = 1;
616 for (;;) {
617 if (optind >= argc) {
618 break;
620 r = argv[optind];
621 if (r[0] != '-') {
622 break;
624 optind++;
625 r++;
626 if (!strcmp(r, "-")) {
627 break;
629 /* Treat --foo the same as -foo. */
630 if (r[0] == '-') {
631 r++;
634 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
635 if (!strcmp(r, arginfo->argv)) {
636 if (arginfo->has_arg) {
637 if (optind >= argc) {
638 (void) fprintf(stderr,
639 "qemu: missing argument for option '%s'\n", r);
640 exit(EXIT_FAILURE);
642 arginfo->handle_opt(argv[optind]);
643 optind++;
644 } else {
645 arginfo->handle_opt(NULL);
647 break;
651 /* no option matched the current argv */
652 if (arginfo->handle_opt == NULL) {
653 (void) fprintf(stderr, "qemu: unknown option '%s'\n", r);
654 exit(EXIT_FAILURE);
658 if (optind >= argc) {
659 (void) fprintf(stderr, "qemu: no user program specified\n");
660 exit(EXIT_FAILURE);
663 exec_path = argv[optind];
665 return optind;
668 int main(int argc, char **argv, char **envp)
670 struct target_pt_regs regs1, *regs = &regs1;
671 struct image_info info1, *info = &info1;
672 struct linux_binprm bprm;
673 TaskState *ts;
674 CPUArchState *env;
675 CPUState *cpu;
676 int optind;
677 char **target_environ, **wrk;
678 char **target_argv;
679 int target_argc;
680 int i;
681 int ret;
682 int execfd;
683 unsigned long max_reserved_va;
684 bool preserve_argv0;
686 error_init(argv[0]);
687 module_call_init(MODULE_INIT_TRACE);
688 qemu_init_cpu_list();
689 module_call_init(MODULE_INIT_QOM);
691 envlist = envlist_create();
694 * add current environment into the list
695 * envlist_setenv adds to the front of the list; to preserve environ
696 * order add from back to front
698 for (wrk = environ; *wrk != NULL; wrk++) {
699 continue;
701 while (wrk != environ) {
702 wrk--;
703 (void) envlist_setenv(envlist, *wrk);
706 /* Read the stack limit from the kernel. If it's "unlimited",
707 then we can do little else besides use the default. */
709 struct rlimit lim;
710 if (getrlimit(RLIMIT_STACK, &lim) == 0
711 && lim.rlim_cur != RLIM_INFINITY
712 && lim.rlim_cur == (target_long)lim.rlim_cur
713 && lim.rlim_cur > guest_stack_size) {
714 guest_stack_size = lim.rlim_cur;
718 cpu_model = NULL;
720 qemu_add_opts(&qemu_trace_opts);
721 qemu_plugin_add_opts();
723 optind = parse_args(argc, argv);
725 qemu_set_log_filename_flags(last_log_filename,
726 last_log_mask | (enable_strace * LOG_STRACE),
727 &error_fatal);
729 if (!trace_init_backends()) {
730 exit(1);
732 trace_init_file();
733 qemu_plugin_load_list(&plugins, &error_fatal);
735 /* Zero out regs */
736 memset(regs, 0, sizeof(struct target_pt_regs));
738 /* Zero out image_info */
739 memset(info, 0, sizeof(struct image_info));
741 memset(&bprm, 0, sizeof (bprm));
743 /* Scan interp_prefix dir for replacement files. */
744 init_paths(interp_prefix);
746 init_qemu_uname_release();
749 * Manage binfmt-misc open-binary flag
751 execfd = qemu_getauxval(AT_EXECFD);
752 if (execfd == 0) {
753 execfd = open(exec_path, O_RDONLY);
754 if (execfd < 0) {
755 printf("Error while loading %s: %s\n", exec_path, strerror(errno));
756 _exit(EXIT_FAILURE);
760 /* Resolve executable file name to full path name */
761 if (realpath(exec_path, real_exec_path)) {
762 exec_path = real_exec_path;
766 * get binfmt_misc flags
768 preserve_argv0 = !!(qemu_getauxval(AT_FLAGS) & AT_FLAGS_PRESERVE_ARGV0);
771 * Manage binfmt-misc preserve-arg[0] flag
772 * argv[optind] full path to the binary
773 * argv[optind + 1] original argv[0]
775 if (optind + 1 < argc && preserve_argv0) {
776 optind++;
779 if (cpu_model == NULL) {
780 cpu_model = cpu_get_model(get_elf_eflags(execfd));
782 cpu_type = parse_cpu_option(cpu_model);
784 /* init tcg before creating CPUs and to get qemu_host_page_size */
786 AccelState *accel = current_accel();
787 AccelClass *ac = ACCEL_GET_CLASS(accel);
789 accel_init_interfaces(ac);
790 object_property_set_bool(OBJECT(accel), "one-insn-per-tb",
791 opt_one_insn_per_tb, &error_abort);
792 ac->init_machine(NULL);
794 cpu = cpu_create(cpu_type);
795 env = cpu_env(cpu);
796 cpu_reset(cpu);
797 thread_cpu = cpu;
800 * Reserving too much vm space via mmap can run into problems
801 * with rlimits, oom due to page table creation, etc. We will
802 * still try it, if directed by the command-line option, but
803 * not by default.
805 max_reserved_va = MAX_RESERVED_VA(cpu);
806 if (reserved_va != 0) {
807 if ((reserved_va + 1) % qemu_host_page_size) {
808 char *s = size_to_str(qemu_host_page_size);
809 fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s);
810 g_free(s);
811 exit(EXIT_FAILURE);
813 if (max_reserved_va && reserved_va > max_reserved_va) {
814 fprintf(stderr, "Reserved virtual address too big\n");
815 exit(EXIT_FAILURE);
817 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
818 /* MAX_RESERVED_VA + 1 is a large power of 2, so is aligned. */
819 reserved_va = max_reserved_va;
823 * Temporarily disable
824 * "comparison is always false due to limited range of data type"
825 * due to comparison between (possible) uint64_t and uintptr_t.
827 #pragma GCC diagnostic push
828 #pragma GCC diagnostic ignored "-Wtype-limits"
831 * Select an initial value for task_unmapped_base that is in range.
833 if (reserved_va) {
834 if (TASK_UNMAPPED_BASE < reserved_va) {
835 task_unmapped_base = TASK_UNMAPPED_BASE;
836 } else {
837 /* The most common default formula is TASK_SIZE / 3. */
838 task_unmapped_base = TARGET_PAGE_ALIGN(reserved_va / 3);
840 } else if (TASK_UNMAPPED_BASE < UINTPTR_MAX) {
841 task_unmapped_base = TASK_UNMAPPED_BASE;
842 } else {
843 /* 32-bit host: pick something medium size. */
844 task_unmapped_base = 0x10000000;
846 mmap_next_start = task_unmapped_base;
848 /* Similarly for elf_et_dyn_base. */
849 if (reserved_va) {
850 if (ELF_ET_DYN_BASE < reserved_va) {
851 elf_et_dyn_base = ELF_ET_DYN_BASE;
852 } else {
853 /* The most common default formula is TASK_SIZE / 3 * 2. */
854 elf_et_dyn_base = TARGET_PAGE_ALIGN(reserved_va / 3) * 2;
856 } else if (ELF_ET_DYN_BASE < UINTPTR_MAX) {
857 elf_et_dyn_base = ELF_ET_DYN_BASE;
858 } else {
859 /* 32-bit host: pick something medium size. */
860 elf_et_dyn_base = 0x18000000;
863 #pragma GCC diagnostic pop
866 Error *err = NULL;
867 if (seed_optarg != NULL) {
868 qemu_guest_random_seed_main(seed_optarg, &err);
869 } else {
870 qcrypto_init(&err);
872 if (err) {
873 error_reportf_err(err, "cannot initialize crypto: ");
874 exit(1);
878 target_environ = envlist_to_environ(envlist, NULL);
879 envlist_free(envlist);
882 * Read in mmap_min_addr kernel parameter. This value is used
883 * When loading the ELF image to determine whether guest_base
884 * is needed. It is also used in mmap_find_vma.
887 FILE *fp;
889 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
890 unsigned long tmp;
891 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
892 mmap_min_addr = tmp;
893 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
894 mmap_min_addr);
896 fclose(fp);
901 * We prefer to not make NULL pointers accessible to QEMU.
902 * If we're in a chroot with no /proc, fall back to 1 page.
904 if (mmap_min_addr == 0) {
905 mmap_min_addr = qemu_host_page_size;
906 qemu_log_mask(CPU_LOG_PAGE,
907 "host mmap_min_addr=0x%lx (fallback)\n",
908 mmap_min_addr);
912 * Prepare copy of argv vector for target.
914 target_argc = argc - optind;
915 target_argv = calloc(target_argc + 1, sizeof (char *));
916 if (target_argv == NULL) {
917 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
918 exit(EXIT_FAILURE);
922 * If argv0 is specified (using '-0' switch) we replace
923 * argv[0] pointer with the given one.
925 i = 0;
926 if (argv0 != NULL) {
927 target_argv[i++] = strdup(argv0);
929 for (; i < target_argc; i++) {
930 target_argv[i] = strdup(argv[optind + i]);
932 target_argv[target_argc] = NULL;
934 ts = g_new0(TaskState, 1);
935 init_task_state(ts);
936 /* build Task State */
937 ts->info = info;
938 ts->bprm = &bprm;
939 cpu->opaque = ts;
940 task_settid(ts);
942 fd_trans_init();
944 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs,
945 info, &bprm);
946 if (ret != 0) {
947 printf("Error while loading %s: %s\n", exec_path, strerror(-ret));
948 _exit(EXIT_FAILURE);
951 for (wrk = target_environ; *wrk; wrk++) {
952 g_free(*wrk);
955 g_free(target_environ);
957 if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
958 FILE *f = qemu_log_trylock();
959 if (f) {
960 fprintf(f, "guest_base %p\n", (void *)guest_base);
961 fprintf(f, "page layout changed following binary load\n");
962 page_dump(f);
964 fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n",
965 info->end_code);
966 fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n",
967 info->start_code);
968 fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n",
969 info->start_data);
970 fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n",
971 info->end_data);
972 fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n",
973 info->start_stack);
974 fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n",
975 info->brk);
976 fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n",
977 info->entry);
978 fprintf(f, "argv_start 0x" TARGET_ABI_FMT_lx "\n",
979 info->argv);
980 fprintf(f, "env_start 0x" TARGET_ABI_FMT_lx "\n",
981 info->envp);
982 fprintf(f, "auxv_start 0x" TARGET_ABI_FMT_lx "\n",
983 info->saved_auxv);
984 qemu_log_unlock(f);
988 target_set_brk(info->brk);
989 syscall_init();
990 signal_init();
992 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay
993 generating the prologue until now so that the prologue can take
994 the real value of GUEST_BASE into account. */
995 tcg_prologue_init();
997 target_cpu_copy_regs(env, regs);
999 if (gdbstub) {
1000 if (gdbserver_start(gdbstub) < 0) {
1001 fprintf(stderr, "qemu: could not open gdbserver on %s\n",
1002 gdbstub);
1003 exit(EXIT_FAILURE);
1005 gdb_handlesig(cpu, 0);
1008 #ifdef CONFIG_SEMIHOSTING
1009 qemu_semihosting_guestfd_init();
1010 #endif
1012 cpu_loop(env);
1013 /* never exits */
1014 return 0;