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>
28 #include <linux/binfmts.h>
30 #include "qapi/error.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"
44 #include "qemu/timer.h"
45 #include "qemu/envlist.h"
46 #include "qemu/guest-random.h"
48 #include "trace/control.h"
49 #include "target_elf.h"
50 #include "cpu_loop-common.h"
51 #include "crypto/init.h"
53 #include "signal-common.h"
55 #include "user-mmap.h"
56 #include "accel/tcg/perf.h"
58 #ifdef CONFIG_SEMIHOSTING
59 #include "semihosting/semihost.h"
62 #ifndef AT_FLAGS_PRESERVE_ARGV0
63 #define AT_FLAGS_PRESERVE_ARGV0_BIT 0
64 #define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT)
70 static const char *argv0;
71 static const char *gdbstub;
72 static envlist_t *envlist;
73 static const char *cpu_model;
74 static const char *cpu_type;
75 static const char *seed_optarg;
76 unsigned long mmap_min_addr;
81 * Used to implement backwards-compatibility for the `-strace`, and
82 * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by
83 * -strace, or vice versa.
85 static bool enable_strace;
88 * The last log mask given by the user in an environment variable or argument.
89 * Used to support command line arguments overriding environment variables.
91 static int last_log_mask;
92 static const char *last_log_filename;
95 * When running 32-on-64 we should make sure we can fit all of the possible
96 * guest address space into a contiguous chunk of virtual host memory.
98 * This way we will never overlap with our own libraries or binaries or stack
99 * or anything else that QEMU maps.
101 * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
102 * of the address for the kernel. Some cpus rely on this and user space
103 * uses the high bit(s) for pointer tagging and the like. For them, we
104 * must preserve the expected address space.
106 #ifndef MAX_RESERVED_VA
107 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
108 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
109 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
110 /* There are a number of places where we assign reserved_va to a variable
111 of type abi_ulong and expect it to fit. Avoid the last page. */
112 # define MAX_RESERVED_VA(CPU) (0xfffffffful & TARGET_PAGE_MASK)
114 # define MAX_RESERVED_VA(CPU) (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
117 # define MAX_RESERVED_VA(CPU) 0
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
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)
146 qemu_plugin_user_prefork_lock();
149 void fork_end(int child)
151 qemu_plugin_user_postfork(child);
152 mmap_fork_end(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, cpu, node);
162 qemu_init_cpu_list();
163 gdbserver_fork(thread_cpu);
164 /* qemu_init_cpu_list() takes care of reinitializing the
165 * exclusive state, so we don't need to end_exclusive() here.
173 __thread CPUState *thread_cpu;
175 bool qemu_cpu_is_self(CPUState *cpu)
177 return thread_cpu == cpu;
180 void qemu_cpu_kick(CPUState *cpu)
185 void task_settid(TaskState *ts)
187 if (ts->ts_tid == 0) {
188 ts->ts_tid = (pid_t)syscall(SYS_gettid);
192 void stop_all_tasks(void)
195 * We trust that when using NPTL, start_exclusive()
196 * handles thread stopping correctly.
201 /* Assumes contents are already zeroed. */
202 void init_task_state(TaskState *ts)
208 ts->sigaltstack_used = (struct target_sigaltstack) {
211 .ss_flags = TARGET_SS_DISABLE,
214 /* Capture task start time relative to system boot */
216 ticks_per_sec = sysconf(_SC_CLK_TCK);
218 if ((ticks_per_sec > 0) && !clock_gettime(CLOCK_BOOTTIME, &bt)) {
219 /* start_boottime is expressed in clock ticks */
220 ts->start_boottime = bt.tv_sec * (uint64_t) ticks_per_sec;
221 ts->start_boottime += bt.tv_nsec * (uint64_t) ticks_per_sec /
222 NANOSECONDS_PER_SECOND;
226 CPUArchState *cpu_copy(CPUArchState *env)
228 CPUState *cpu = env_cpu(env);
229 CPUState *new_cpu = cpu_create(cpu_type);
230 CPUArchState *new_env = new_cpu->env_ptr;
233 /* Reset non arch specific state */
236 new_cpu->tcg_cflags = cpu->tcg_cflags;
237 memcpy(new_env, env, sizeof(CPUArchState));
239 /* Clone all break/watchpoints.
240 Note: Once we support ptrace with hw-debug register access, make sure
241 BP_CPU break/watchpoints are handled correctly on clone. */
242 QTAILQ_INIT(&new_cpu->breakpoints);
243 QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
244 cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
250 static void handle_arg_help(const char *arg)
255 static void handle_arg_log(const char *arg)
257 last_log_mask = qemu_str_to_log_mask(arg);
258 if (!last_log_mask) {
259 qemu_print_log_usage(stdout);
264 static void handle_arg_dfilter(const char *arg)
266 qemu_set_dfilter_ranges(arg, &error_fatal);
269 static void handle_arg_log_filename(const char *arg)
271 last_log_filename = arg;
274 static void handle_arg_set_env(const char *arg)
278 while ((token = strsep(&p, ",")) != NULL) {
279 if (envlist_setenv(envlist, token) != 0) {
286 static void handle_arg_unset_env(const char *arg)
290 while ((token = strsep(&p, ",")) != NULL) {
291 if (envlist_unsetenv(envlist, token) != 0) {
298 static void handle_arg_argv0(const char *arg)
303 static void handle_arg_stack_size(const char *arg)
306 guest_stack_size = strtoul(arg, &p, 0);
307 if (guest_stack_size == 0) {
312 guest_stack_size *= MiB;
313 } else if (*p == 'k' || *p == 'K') {
314 guest_stack_size *= KiB;
318 static void handle_arg_ld_prefix(const char *arg)
320 interp_prefix = strdup(arg);
323 static void handle_arg_pagesize(const char *arg)
325 qemu_host_page_size = atoi(arg);
326 if (qemu_host_page_size == 0 ||
327 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
328 fprintf(stderr, "page size must be a power of two\n");
333 static void handle_arg_seed(const char *arg)
338 static void handle_arg_gdb(const char *arg)
340 gdbstub = g_strdup(arg);
343 static void handle_arg_uname(const char *arg)
345 qemu_uname_release = strdup(arg);
348 static void handle_arg_cpu(const char *arg)
350 cpu_model = strdup(arg);
351 if (cpu_model == NULL || is_help_option(cpu_model)) {
352 /* XXX: implement xxx_cpu_list for targets that still miss it */
353 #if defined(cpu_list)
360 static void handle_arg_guest_base(const char *arg)
362 guest_base = strtol(arg, NULL, 0);
363 have_guest_base = true;
366 static void handle_arg_reserved_va(const char *arg)
370 reserved_va = strtoul(arg, &p, 0);
384 unsigned long unshifted = reserved_va;
386 reserved_va <<= shift;
387 if (reserved_va >> shift != unshifted) {
388 fprintf(stderr, "Reserved virtual address too big\n");
393 fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p);
398 static void handle_arg_singlestep(const char *arg)
403 static void handle_arg_strace(const char *arg)
405 enable_strace = true;
408 static void handle_arg_version(const char *arg)
410 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
411 "\n" QEMU_COPYRIGHT "\n");
415 static void handle_arg_trace(const char *arg)
417 trace_opt_parse(arg);
420 #if defined(TARGET_XTENSA)
421 static void handle_arg_abi_call0(const char *arg)
423 xtensa_set_abi_call0();
427 static void handle_arg_perfmap(const char *arg)
429 perf_enable_perfmap();
432 static void handle_arg_jitdump(const char *arg)
434 perf_enable_jitdump();
437 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins);
440 static void handle_arg_plugin(const char *arg)
442 qemu_plugin_opt_parse(arg, &plugins);
446 struct qemu_argument {
450 void (*handle_opt)(const char *arg);
455 static const struct qemu_argument arg_table[] = {
456 {"h", "", false, handle_arg_help,
457 "", "print this help"},
458 {"help", "", false, handle_arg_help,
460 {"g", "QEMU_GDB", true, handle_arg_gdb,
461 "port", "wait gdb connection to 'port'"},
462 {"L", "QEMU_LD_PREFIX", true, handle_arg_ld_prefix,
463 "path", "set the elf interpreter prefix to 'path'"},
464 {"s", "QEMU_STACK_SIZE", true, handle_arg_stack_size,
465 "size", "set the stack size to 'size' bytes"},
466 {"cpu", "QEMU_CPU", true, handle_arg_cpu,
467 "model", "select CPU (-cpu help for list)"},
468 {"E", "QEMU_SET_ENV", true, handle_arg_set_env,
469 "var=value", "sets targets environment variable (see below)"},
470 {"U", "QEMU_UNSET_ENV", true, handle_arg_unset_env,
471 "var", "unsets targets environment variable (see below)"},
472 {"0", "QEMU_ARGV0", true, handle_arg_argv0,
473 "argv0", "forces target process argv[0] to be 'argv0'"},
474 {"r", "QEMU_UNAME", true, handle_arg_uname,
475 "uname", "set qemu uname release string to 'uname'"},
476 {"B", "QEMU_GUEST_BASE", true, handle_arg_guest_base,
477 "address", "set guest_base address to 'address'"},
478 {"R", "QEMU_RESERVED_VA", true, handle_arg_reserved_va,
479 "size", "reserve 'size' bytes for guest virtual address space"},
480 {"d", "QEMU_LOG", true, handle_arg_log,
481 "item[,...]", "enable logging of specified items "
482 "(use '-d help' for a list of items)"},
483 {"dfilter", "QEMU_DFILTER", true, handle_arg_dfilter,
484 "range[,...]","filter logging based on address range"},
485 {"D", "QEMU_LOG_FILENAME", true, handle_arg_log_filename,
486 "logfile", "write logs to 'logfile' (default stderr)"},
487 {"p", "QEMU_PAGESIZE", true, handle_arg_pagesize,
488 "pagesize", "set the host page size to 'pagesize'"},
489 {"singlestep", "QEMU_SINGLESTEP", false, handle_arg_singlestep,
490 "", "run in singlestep mode"},
491 {"strace", "QEMU_STRACE", false, handle_arg_strace,
492 "", "log system calls"},
493 {"seed", "QEMU_RAND_SEED", true, handle_arg_seed,
494 "", "Seed for pseudo-random number generator"},
495 {"trace", "QEMU_TRACE", true, handle_arg_trace,
496 "", "[[enable=]<pattern>][,events=<file>][,file=<file>]"},
498 {"plugin", "QEMU_PLUGIN", true, handle_arg_plugin,
499 "", "[file=]<file>[,<argname>=<argvalue>]"},
501 {"version", "QEMU_VERSION", false, handle_arg_version,
502 "", "display version information and exit"},
503 #if defined(TARGET_XTENSA)
504 {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0,
505 "", "assume CALL0 Xtensa ABI"},
507 {"perfmap", "QEMU_PERFMAP", false, handle_arg_perfmap,
508 "", "Generate a /tmp/perf-${pid}.map file for perf"},
509 {"jitdump", "QEMU_JITDUMP", false, handle_arg_jitdump,
510 "", "Generate a jit-${pid}.dump file for perf"},
511 {NULL, NULL, false, NULL, NULL, NULL}
514 static void usage(int exitcode)
516 const struct qemu_argument *arginfo;
520 printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
521 "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n"
523 "Options and associated environment variables:\n"
526 /* Calculate column widths. We must always have at least enough space
527 * for the column header.
529 maxarglen = strlen("Argument");
530 maxenvlen = strlen("Env-variable");
532 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
533 int arglen = strlen(arginfo->argv);
534 if (arginfo->has_arg) {
535 arglen += strlen(arginfo->example) + 1;
537 if (strlen(arginfo->env) > maxenvlen) {
538 maxenvlen = strlen(arginfo->env);
540 if (arglen > maxarglen) {
545 printf("%-*s %-*s Description\n", maxarglen+1, "Argument",
546 maxenvlen, "Env-variable");
548 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
549 if (arginfo->has_arg) {
550 printf("-%s %-*s %-*s %s\n", arginfo->argv,
551 (int)(maxarglen - strlen(arginfo->argv) - 1),
552 arginfo->example, maxenvlen, arginfo->env, arginfo->help);
554 printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
555 maxenvlen, arginfo->env,
562 "QEMU_LD_PREFIX = %s\n"
563 "QEMU_STACK_SIZE = %ld byte\n",
568 "You can use -E and -U options or the QEMU_SET_ENV and\n"
569 "QEMU_UNSET_ENV environment variables to set and unset\n"
570 "environment variables for the target process.\n"
571 "It is possible to provide several variables by separating them\n"
572 "by commas in getsubopt(3) style. Additionally it is possible to\n"
573 "provide the -E and -U options multiple times.\n"
574 "The following lines are equivalent:\n"
575 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
576 " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n"
577 " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n"
578 "Note that if you provide several changes to a single variable\n"
579 "the last change will stay in effect.\n"
581 QEMU_HELP_BOTTOM "\n");
586 static int parse_args(int argc, char **argv)
590 const struct qemu_argument *arginfo;
592 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
593 if (arginfo->env == NULL) {
597 r = getenv(arginfo->env);
599 arginfo->handle_opt(r);
605 if (optind >= argc) {
614 if (!strcmp(r, "-")) {
617 /* Treat --foo the same as -foo. */
622 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
623 if (!strcmp(r, arginfo->argv)) {
624 if (arginfo->has_arg) {
625 if (optind >= argc) {
626 (void) fprintf(stderr,
627 "qemu: missing argument for option '%s'\n", r);
630 arginfo->handle_opt(argv[optind]);
633 arginfo->handle_opt(NULL);
639 /* no option matched the current argv */
640 if (arginfo->handle_opt == NULL) {
641 (void) fprintf(stderr, "qemu: unknown option '%s'\n", r);
646 if (optind >= argc) {
647 (void) fprintf(stderr, "qemu: no user program specified\n");
651 exec_path = argv[optind];
656 int main(int argc, char **argv, char **envp)
658 struct target_pt_regs regs1, *regs = ®s1;
659 struct image_info info1, *info = &info1;
660 struct linux_binprm bprm;
665 char **target_environ, **wrk;
671 unsigned long max_reserved_va;
675 module_call_init(MODULE_INIT_TRACE);
676 qemu_init_cpu_list();
677 module_call_init(MODULE_INIT_QOM);
679 envlist = envlist_create();
681 /* add current environment into the list */
682 for (wrk = environ; *wrk != NULL; wrk++) {
683 (void) envlist_setenv(envlist, *wrk);
686 /* Read the stack limit from the kernel. If it's "unlimited",
687 then we can do little else besides use the default. */
690 if (getrlimit(RLIMIT_STACK, &lim) == 0
691 && lim.rlim_cur != RLIM_INFINITY
692 && lim.rlim_cur == (target_long)lim.rlim_cur
693 && lim.rlim_cur > guest_stack_size) {
694 guest_stack_size = lim.rlim_cur;
700 qemu_add_opts(&qemu_trace_opts);
701 qemu_plugin_add_opts();
703 optind = parse_args(argc, argv);
705 qemu_set_log_filename_flags(last_log_filename,
706 last_log_mask | (enable_strace * LOG_STRACE),
709 if (!trace_init_backends()) {
713 qemu_plugin_load_list(&plugins, &error_fatal);
716 memset(regs, 0, sizeof(struct target_pt_regs));
718 /* Zero out image_info */
719 memset(info, 0, sizeof(struct image_info));
721 memset(&bprm, 0, sizeof (bprm));
723 /* Scan interp_prefix dir for replacement files. */
724 init_paths(interp_prefix);
726 init_qemu_uname_release();
729 * Manage binfmt-misc open-binary flag
731 execfd = qemu_getauxval(AT_EXECFD);
733 execfd = open(exec_path, O_RDONLY);
735 printf("Error while loading %s: %s\n", exec_path, strerror(errno));
741 * get binfmt_misc flags
743 preserve_argv0 = !!(qemu_getauxval(AT_FLAGS) & AT_FLAGS_PRESERVE_ARGV0);
746 * Manage binfmt-misc preserve-arg[0] flag
747 * argv[optind] full path to the binary
748 * argv[optind + 1] original argv[0]
750 if (optind + 1 < argc && preserve_argv0) {
754 if (cpu_model == NULL) {
755 cpu_model = cpu_get_model(get_elf_eflags(execfd));
757 cpu_type = parse_cpu_option(cpu_model);
759 /* init tcg before creating CPUs and to get qemu_host_page_size */
761 AccelClass *ac = ACCEL_GET_CLASS(current_accel());
763 accel_init_interfaces(ac);
764 ac->init_machine(NULL);
766 cpu = cpu_create(cpu_type);
772 * Reserving too much vm space via mmap can run into problems
773 * with rlimits, oom due to page table creation, etc. We will
774 * still try it, if directed by the command-line option, but
777 max_reserved_va = MAX_RESERVED_VA(cpu);
778 if (reserved_va != 0) {
779 if (max_reserved_va && reserved_va > max_reserved_va) {
780 fprintf(stderr, "Reserved virtual address too big\n");
783 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
785 * reserved_va must be aligned with the host page size
786 * as it is used with mmap()
788 reserved_va = max_reserved_va & qemu_host_page_mask;
793 if (seed_optarg != NULL) {
794 qemu_guest_random_seed_main(seed_optarg, &err);
799 error_reportf_err(err, "cannot initialize crypto: ");
804 target_environ = envlist_to_environ(envlist, NULL);
805 envlist_free(envlist);
808 * Read in mmap_min_addr kernel parameter. This value is used
809 * When loading the ELF image to determine whether guest_base
810 * is needed. It is also used in mmap_find_vma.
815 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
817 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
819 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
827 * We prefer to not make NULL pointers accessible to QEMU.
828 * If we're in a chroot with no /proc, fall back to 1 page.
830 if (mmap_min_addr == 0) {
831 mmap_min_addr = qemu_host_page_size;
832 qemu_log_mask(CPU_LOG_PAGE,
833 "host mmap_min_addr=0x%lx (fallback)\n",
838 * Prepare copy of argv vector for target.
840 target_argc = argc - optind;
841 target_argv = calloc(target_argc + 1, sizeof (char *));
842 if (target_argv == NULL) {
843 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
848 * If argv0 is specified (using '-0' switch) we replace
849 * argv[0] pointer with the given one.
853 target_argv[i++] = strdup(argv0);
855 for (; i < target_argc; i++) {
856 target_argv[i] = strdup(argv[optind + i]);
858 target_argv[target_argc] = NULL;
860 ts = g_new0(TaskState, 1);
862 /* build Task State */
870 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs,
873 printf("Error while loading %s: %s\n", exec_path, strerror(-ret));
877 for (wrk = target_environ; *wrk; wrk++) {
881 g_free(target_environ);
883 if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
884 FILE *f = qemu_log_trylock();
886 fprintf(f, "guest_base %p\n", (void *)guest_base);
887 fprintf(f, "page layout changed following binary load\n");
890 fprintf(f, "start_brk 0x" TARGET_ABI_FMT_lx "\n",
892 fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n",
894 fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n",
896 fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n",
898 fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n",
900 fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n",
902 fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n",
904 fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n",
906 fprintf(f, "argv_start 0x" TARGET_ABI_FMT_lx "\n",
908 fprintf(f, "env_start 0x" TARGET_ABI_FMT_lx "\n",
910 fprintf(f, "auxv_start 0x" TARGET_ABI_FMT_lx "\n",
916 target_set_brk(info->brk);
920 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay
921 generating the prologue until now so that the prologue can take
922 the real value of GUEST_BASE into account. */
923 tcg_prologue_init(tcg_ctx);
925 target_cpu_copy_regs(env, regs);
928 if (gdbserver_start(gdbstub) < 0) {
929 fprintf(stderr, "qemu: could not open gdbserver on %s\n",
933 gdb_handlesig(cpu, 0);
936 #ifdef CONFIG_SEMIHOSTING
937 qemu_semihosting_guestfd_init();