| /* |
| * qemu user main |
| * |
| * Copyright (c) 2003-2008 Fabrice Bellard |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qemu/help-texts.h" |
| #include "qemu/units.h" |
| #include "qemu/accel.h" |
| #include "qemu-version.h" |
| #include <sys/syscall.h> |
| #include <sys/resource.h> |
| #include <sys/shm.h> |
| #include <linux/binfmts.h> |
| |
| #include "qapi/error.h" |
| #include "qemu.h" |
| #include "user-internals.h" |
| #include "qemu/path.h" |
| #include "qemu/queue.h" |
| #include "qemu/config-file.h" |
| #include "qemu/cutils.h" |
| #include "qemu/error-report.h" |
| #include "qemu/help_option.h" |
| #include "qemu/module.h" |
| #include "qemu/plugin.h" |
| #include "exec/exec-all.h" |
| #include "exec/gdbstub.h" |
| #include "gdbstub/user.h" |
| #include "tcg/startup.h" |
| #include "qemu/timer.h" |
| #include "qemu/envlist.h" |
| #include "qemu/guest-random.h" |
| #include "elf.h" |
| #include "trace/control.h" |
| #include "target_elf.h" |
| #include "cpu_loop-common.h" |
| #include "crypto/init.h" |
| #include "fd-trans.h" |
| #include "signal-common.h" |
| #include "loader.h" |
| #include "user-mmap.h" |
| #include "tcg/perf.h" |
| #include "exec/page-vary.h" |
| |
| #ifdef CONFIG_SEMIHOSTING |
| #include "semihosting/semihost.h" |
| #endif |
| |
| #ifndef AT_FLAGS_PRESERVE_ARGV0 |
| #define AT_FLAGS_PRESERVE_ARGV0_BIT 0 |
| #define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT) |
| #endif |
| |
| char *exec_path; |
| char real_exec_path[PATH_MAX]; |
| |
| static bool opt_one_insn_per_tb; |
| static const char *argv0; |
| static const char *gdbstub; |
| static envlist_t *envlist; |
| static const char *cpu_model; |
| static const char *cpu_type; |
| static const char *seed_optarg; |
| unsigned long mmap_min_addr; |
| uintptr_t guest_base; |
| bool have_guest_base; |
| |
| /* |
| * Used to implement backwards-compatibility for the `-strace`, and |
| * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by |
| * -strace, or vice versa. |
| */ |
| static bool enable_strace; |
| |
| /* |
| * The last log mask given by the user in an environment variable or argument. |
| * Used to support command line arguments overriding environment variables. |
| */ |
| static int last_log_mask; |
| static const char *last_log_filename; |
| |
| /* |
| * When running 32-on-64 we should make sure we can fit all of the possible |
| * guest address space into a contiguous chunk of virtual host memory. |
| * |
| * This way we will never overlap with our own libraries or binaries or stack |
| * or anything else that QEMU maps. |
| * |
| * Many cpus reserve the high bit (or more than one for some 64-bit cpus) |
| * of the address for the kernel. Some cpus rely on this and user space |
| * uses the high bit(s) for pointer tagging and the like. For them, we |
| * must preserve the expected address space. |
| */ |
| #ifndef MAX_RESERVED_VA |
| # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS |
| # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \ |
| (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32)) |
| # define MAX_RESERVED_VA(CPU) 0xfffffffful |
| # else |
| # define MAX_RESERVED_VA(CPU) ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1) |
| # endif |
| # else |
| # define MAX_RESERVED_VA(CPU) 0 |
| # endif |
| #endif |
| |
| unsigned long reserved_va; |
| |
| static void usage(int exitcode); |
| |
| static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; |
| const char *qemu_uname_release; |
| |
| #if !defined(TARGET_DEFAULT_STACK_SIZE) |
| /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so |
| we allocate a bigger stack. Need a better solution, for example |
| by remapping the process stack directly at the right place */ |
| #define TARGET_DEFAULT_STACK_SIZE 8 * 1024 * 1024UL |
| #endif |
| |
| unsigned long guest_stack_size = TARGET_DEFAULT_STACK_SIZE; |
| |
| /***********************************************************/ |
| /* Helper routines for implementing atomic operations. */ |
| |
| /* Make sure everything is in a consistent state for calling fork(). */ |
| void fork_start(void) |
| { |
| start_exclusive(); |
| mmap_fork_start(); |
| cpu_list_lock(); |
| qemu_plugin_user_prefork_lock(); |
| gdbserver_fork_start(); |
| } |
| |
| void fork_end(pid_t pid) |
| { |
| bool child = pid == 0; |
| |
| qemu_plugin_user_postfork(child); |
| mmap_fork_end(child); |
| if (child) { |
| CPUState *cpu, *next_cpu; |
| /* Child processes created by fork() only have a single thread. |
| Discard information about the parent threads. */ |
| CPU_FOREACH_SAFE(cpu, next_cpu) { |
| if (cpu != thread_cpu) { |
| QTAILQ_REMOVE_RCU(&cpus_queue, cpu, node); |
| } |
| } |
| qemu_init_cpu_list(); |
| get_task_state(thread_cpu)->ts_tid = qemu_get_thread_id(); |
| } else { |
| cpu_list_unlock(); |
| } |
| gdbserver_fork_end(thread_cpu, pid); |
| /* |
| * qemu_init_cpu_list() reinitialized the child exclusive state, but we |
| * also need to keep current_cpu consistent, so call end_exclusive() for |
| * both child and parent. |
| */ |
| end_exclusive(); |
| } |
| |
| __thread CPUState *thread_cpu; |
| |
| bool qemu_cpu_is_self(CPUState *cpu) |
| { |
| return thread_cpu == cpu; |
| } |
| |
| void qemu_cpu_kick(CPUState *cpu) |
| { |
| cpu_exit(cpu); |
| } |
| |
| void task_settid(TaskState *ts) |
| { |
| if (ts->ts_tid == 0) { |
| ts->ts_tid = (pid_t)syscall(SYS_gettid); |
| } |
| } |
| |
| void stop_all_tasks(void) |
| { |
| /* |
| * We trust that when using NPTL, start_exclusive() |
| * handles thread stopping correctly. |
| */ |
| start_exclusive(); |
| } |
| |
| /* Assumes contents are already zeroed. */ |
| void init_task_state(TaskState *ts) |
| { |
| long ticks_per_sec; |
| struct timespec bt; |
| |
| ts->used = 1; |
| ts->sigaltstack_used = (struct target_sigaltstack) { |
| .ss_sp = 0, |
| .ss_size = 0, |
| .ss_flags = TARGET_SS_DISABLE, |
| }; |
| |
| /* Capture task start time relative to system boot */ |
| |
| ticks_per_sec = sysconf(_SC_CLK_TCK); |
| |
| if ((ticks_per_sec > 0) && !clock_gettime(CLOCK_BOOTTIME, &bt)) { |
| /* start_boottime is expressed in clock ticks */ |
| ts->start_boottime = bt.tv_sec * (uint64_t) ticks_per_sec; |
| ts->start_boottime += bt.tv_nsec * (uint64_t) ticks_per_sec / |
| NANOSECONDS_PER_SECOND; |
| } |
| } |
| |
| CPUArchState *cpu_copy(CPUArchState *env) |
| { |
| CPUState *cpu = env_cpu(env); |
| CPUState *new_cpu = cpu_create(cpu_type); |
| CPUArchState *new_env = cpu_env(new_cpu); |
| CPUBreakpoint *bp; |
| |
| /* Reset non arch specific state */ |
| cpu_reset(new_cpu); |
| |
| new_cpu->tcg_cflags = cpu->tcg_cflags; |
| memcpy(new_env, env, sizeof(CPUArchState)); |
| #if defined(TARGET_I386) || defined(TARGET_X86_64) |
| new_env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES, |
| PROT_READ | PROT_WRITE, |
| MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); |
| memcpy(g2h_untagged(new_env->gdt.base), g2h_untagged(env->gdt.base), |
| sizeof(uint64_t) * TARGET_GDT_ENTRIES); |
| OBJECT(new_cpu)->free = OBJECT(cpu)->free; |
| #endif |
| |
| /* Clone all break/watchpoints. |
| Note: Once we support ptrace with hw-debug register access, make sure |
| BP_CPU break/watchpoints are handled correctly on clone. */ |
| QTAILQ_INIT(&new_cpu->breakpoints); |
| QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) { |
| cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL); |
| } |
| |
| return new_env; |
| } |
| |
| static void handle_arg_help(const char *arg) |
| { |
| usage(EXIT_SUCCESS); |
| } |
| |
| static void handle_arg_log(const char *arg) |
| { |
| last_log_mask = qemu_str_to_log_mask(arg); |
| if (!last_log_mask) { |
| qemu_print_log_usage(stdout); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| static void handle_arg_dfilter(const char *arg) |
| { |
| qemu_set_dfilter_ranges(arg, &error_fatal); |
| } |
| |
| static void handle_arg_log_filename(const char *arg) |
| { |
| last_log_filename = arg; |
| } |
| |
| static void handle_arg_set_env(const char *arg) |
| { |
| char *r, *p, *token; |
| r = p = strdup(arg); |
| while ((token = strsep(&p, ",")) != NULL) { |
| if (envlist_setenv(envlist, token) != 0) { |
| usage(EXIT_FAILURE); |
| } |
| } |
| free(r); |
| } |
| |
| static void handle_arg_unset_env(const char *arg) |
| { |
| char *r, *p, *token; |
| r = p = strdup(arg); |
| while ((token = strsep(&p, ",")) != NULL) { |
| if (envlist_unsetenv(envlist, token) != 0) { |
| usage(EXIT_FAILURE); |
| } |
| } |
| free(r); |
| } |
| |
| static void handle_arg_argv0(const char *arg) |
| { |
| argv0 = strdup(arg); |
| } |
| |
| static void handle_arg_stack_size(const char *arg) |
| { |
| char *p; |
| guest_stack_size = strtoul(arg, &p, 0); |
| if (guest_stack_size == 0) { |
| usage(EXIT_FAILURE); |
| } |
| |
| if (*p == 'M') { |
| guest_stack_size *= MiB; |
| } else if (*p == 'k' || *p == 'K') { |
| guest_stack_size *= KiB; |
| } |
| } |
| |
| static void handle_arg_ld_prefix(const char *arg) |
| { |
| interp_prefix = strdup(arg); |
| } |
| |
| static void handle_arg_pagesize(const char *arg) |
| { |
| unsigned size, want = qemu_real_host_page_size(); |
| |
| if (qemu_strtoui(arg, NULL, 10, &size) || size != want) { |
| warn_report("Deprecated page size option cannot " |
| "change host page size (%u)", want); |
| } |
| } |
| |
| static void handle_arg_seed(const char *arg) |
| { |
| seed_optarg = arg; |
| } |
| |
| static void handle_arg_gdb(const char *arg) |
| { |
| gdbstub = g_strdup(arg); |
| } |
| |
| static void handle_arg_uname(const char *arg) |
| { |
| qemu_uname_release = strdup(arg); |
| } |
| |
| static void handle_arg_cpu(const char *arg) |
| { |
| cpu_model = strdup(arg); |
| if (cpu_model == NULL || is_help_option(cpu_model)) { |
| list_cpus(); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| static void handle_arg_guest_base(const char *arg) |
| { |
| guest_base = strtol(arg, NULL, 0); |
| have_guest_base = true; |
| } |
| |
| static void handle_arg_reserved_va(const char *arg) |
| { |
| char *p; |
| int shift = 0; |
| unsigned long val; |
| |
| val = strtoul(arg, &p, 0); |
| switch (*p) { |
| case 'k': |
| case 'K': |
| shift = 10; |
| break; |
| case 'M': |
| shift = 20; |
| break; |
| case 'G': |
| shift = 30; |
| break; |
| } |
| if (shift) { |
| unsigned long unshifted = val; |
| p++; |
| val <<= shift; |
| if (val >> shift != unshifted) { |
| fprintf(stderr, "Reserved virtual address too big\n"); |
| exit(EXIT_FAILURE); |
| } |
| } |
| if (*p) { |
| fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p); |
| exit(EXIT_FAILURE); |
| } |
| /* The representation is size - 1, with 0 remaining "default". */ |
| reserved_va = val ? val - 1 : 0; |
| } |
| |
| static void handle_arg_one_insn_per_tb(const char *arg) |
| { |
| opt_one_insn_per_tb = true; |
| } |
| |
| static void handle_arg_strace(const char *arg) |
| { |
| enable_strace = true; |
| } |
| |
| static void handle_arg_version(const char *arg) |
| { |
| printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION |
| "\n" QEMU_COPYRIGHT "\n"); |
| exit(EXIT_SUCCESS); |
| } |
| |
| static void handle_arg_trace(const char *arg) |
| { |
| trace_opt_parse(arg); |
| } |
| |
| #if defined(TARGET_XTENSA) |
| static void handle_arg_abi_call0(const char *arg) |
| { |
| xtensa_set_abi_call0(); |
| } |
| #endif |
| |
| static void handle_arg_perfmap(const char *arg) |
| { |
| perf_enable_perfmap(); |
| } |
| |
| static void handle_arg_jitdump(const char *arg) |
| { |
| perf_enable_jitdump(); |
| } |
| |
| static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins); |
| |
| #ifdef CONFIG_PLUGIN |
| static void handle_arg_plugin(const char *arg) |
| { |
| qemu_plugin_opt_parse(arg, &plugins); |
| } |
| #endif |
| |
| struct qemu_argument { |
| const char *argv; |
| const char *env; |
| bool has_arg; |
| void (*handle_opt)(const char *arg); |
| const char *example; |
| const char *help; |
| }; |
| |
| static const struct qemu_argument arg_table[] = { |
| {"h", "", false, handle_arg_help, |
| "", "print this help"}, |
| {"help", "", false, handle_arg_help, |
| "", ""}, |
| {"g", "QEMU_GDB", true, handle_arg_gdb, |
| "port", "wait gdb connection to 'port'"}, |
| {"L", "QEMU_LD_PREFIX", true, handle_arg_ld_prefix, |
| "path", "set the elf interpreter prefix to 'path'"}, |
| {"s", "QEMU_STACK_SIZE", true, handle_arg_stack_size, |
| "size", "set the stack size to 'size' bytes"}, |
| {"cpu", "QEMU_CPU", true, handle_arg_cpu, |
| "model", "select CPU (-cpu help for list)"}, |
| {"E", "QEMU_SET_ENV", true, handle_arg_set_env, |
| "var=value", "sets targets environment variable (see below)"}, |
| {"U", "QEMU_UNSET_ENV", true, handle_arg_unset_env, |
| "var", "unsets targets environment variable (see below)"}, |
| {"0", "QEMU_ARGV0", true, handle_arg_argv0, |
| "argv0", "forces target process argv[0] to be 'argv0'"}, |
| {"r", "QEMU_UNAME", true, handle_arg_uname, |
| "uname", "set qemu uname release string to 'uname'"}, |
| {"B", "QEMU_GUEST_BASE", true, handle_arg_guest_base, |
| "address", "set guest_base address to 'address'"}, |
| {"R", "QEMU_RESERVED_VA", true, handle_arg_reserved_va, |
| "size", "reserve 'size' bytes for guest virtual address space"}, |
| {"d", "QEMU_LOG", true, handle_arg_log, |
| "item[,...]", "enable logging of specified items " |
| "(use '-d help' for a list of items)"}, |
| {"dfilter", "QEMU_DFILTER", true, handle_arg_dfilter, |
| "range[,...]","filter logging based on address range"}, |
| {"D", "QEMU_LOG_FILENAME", true, handle_arg_log_filename, |
| "logfile", "write logs to 'logfile' (default stderr)"}, |
| {"p", "QEMU_PAGESIZE", true, handle_arg_pagesize, |
| "pagesize", "deprecated change to host page size"}, |
| {"one-insn-per-tb", |
| "QEMU_ONE_INSN_PER_TB", false, handle_arg_one_insn_per_tb, |
| "", "run with one guest instruction per emulated TB"}, |
| {"strace", "QEMU_STRACE", false, handle_arg_strace, |
| "", "log system calls"}, |
| {"seed", "QEMU_RAND_SEED", true, handle_arg_seed, |
| "", "Seed for pseudo-random number generator"}, |
| {"trace", "QEMU_TRACE", true, handle_arg_trace, |
| "", "[[enable=]<pattern>][,events=<file>][,file=<file>]"}, |
| #ifdef CONFIG_PLUGIN |
| {"plugin", "QEMU_PLUGIN", true, handle_arg_plugin, |
| "", "[file=]<file>[,<argname>=<argvalue>]"}, |
| #endif |
| {"version", "QEMU_VERSION", false, handle_arg_version, |
| "", "display version information and exit"}, |
| #if defined(TARGET_XTENSA) |
| {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0, |
| "", "assume CALL0 Xtensa ABI"}, |
| #endif |
| {"perfmap", "QEMU_PERFMAP", false, handle_arg_perfmap, |
| "", "Generate a /tmp/perf-${pid}.map file for perf"}, |
| {"jitdump", "QEMU_JITDUMP", false, handle_arg_jitdump, |
| "", "Generate a jit-${pid}.dump file for perf"}, |
| {NULL, NULL, false, NULL, NULL, NULL} |
| }; |
| |
| static void usage(int exitcode) |
| { |
| const struct qemu_argument *arginfo; |
| int maxarglen; |
| int maxenvlen; |
| |
| printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" |
| "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n" |
| "\n" |
| "Options and associated environment variables:\n" |
| "\n"); |
| |
| /* Calculate column widths. We must always have at least enough space |
| * for the column header. |
| */ |
| maxarglen = strlen("Argument"); |
| maxenvlen = strlen("Env-variable"); |
| |
| for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { |
| int arglen = strlen(arginfo->argv); |
| if (arginfo->has_arg) { |
| arglen += strlen(arginfo->example) + 1; |
| } |
| if (strlen(arginfo->env) > maxenvlen) { |
| maxenvlen = strlen(arginfo->env); |
| } |
| if (arglen > maxarglen) { |
| maxarglen = arglen; |
| } |
| } |
| |
| printf("%-*s %-*s Description\n", maxarglen+1, "Argument", |
| maxenvlen, "Env-variable"); |
| |
| for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { |
| if (arginfo->has_arg) { |
| printf("-%s %-*s %-*s %s\n", arginfo->argv, |
| (int)(maxarglen - strlen(arginfo->argv) - 1), |
| arginfo->example, maxenvlen, arginfo->env, arginfo->help); |
| } else { |
| printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv, |
| maxenvlen, arginfo->env, |
| arginfo->help); |
| } |
| } |
| |
| printf("\n" |
| "Defaults:\n" |
| "QEMU_LD_PREFIX = %s\n" |
| "QEMU_STACK_SIZE = %ld byte\n", |
| interp_prefix, |
| guest_stack_size); |
| |
| printf("\n" |
| "You can use -E and -U options or the QEMU_SET_ENV and\n" |
| "QEMU_UNSET_ENV environment variables to set and unset\n" |
| "environment variables for the target process.\n" |
| "It is possible to provide several variables by separating them\n" |
| "by commas in getsubopt(3) style. Additionally it is possible to\n" |
| "provide the -E and -U options multiple times.\n" |
| "The following lines are equivalent:\n" |
| " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" |
| " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n" |
| " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n" |
| "Note that if you provide several changes to a single variable\n" |
| "the last change will stay in effect.\n" |
| "\n" |
| QEMU_HELP_BOTTOM "\n"); |
| |
| exit(exitcode); |
| } |
| |
| static int parse_args(int argc, char **argv) |
| { |
| const char *r; |
| int optind; |
| const struct qemu_argument *arginfo; |
| |
| for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { |
| if (arginfo->env == NULL) { |
| continue; |
| } |
| |
| r = getenv(arginfo->env); |
| if (r != NULL) { |
| arginfo->handle_opt(r); |
| } |
| } |
| |
| optind = 1; |
| for (;;) { |
| if (optind >= argc) { |
| break; |
| } |
| r = argv[optind]; |
| if (r[0] != '-') { |
| break; |
| } |
| optind++; |
| r++; |
| if (!strcmp(r, "-")) { |
| break; |
| } |
| /* Treat --foo the same as -foo. */ |
| if (r[0] == '-') { |
| r++; |
| } |
| |
| for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { |
| if (!strcmp(r, arginfo->argv)) { |
| if (arginfo->has_arg) { |
| if (optind >= argc) { |
| (void) fprintf(stderr, |
| "qemu: missing argument for option '%s'\n", r); |
| exit(EXIT_FAILURE); |
| } |
| arginfo->handle_opt(argv[optind]); |
| optind++; |
| } else { |
| arginfo->handle_opt(NULL); |
| } |
| break; |
| } |
| } |
| |
| /* no option matched the current argv */ |
| if (arginfo->handle_opt == NULL) { |
| (void) fprintf(stderr, "qemu: unknown option '%s'\n", r); |
| exit(EXIT_FAILURE); |
| } |
| } |
| |
| if (optind >= argc) { |
| (void) fprintf(stderr, "qemu: no user program specified\n"); |
| exit(EXIT_FAILURE); |
| } |
| |
| exec_path = argv[optind]; |
| |
| return optind; |
| } |
| |
| int main(int argc, char **argv, char **envp) |
| { |
| struct target_pt_regs regs1, *regs = ®s1; |
| struct image_info info1, *info = &info1; |
| struct linux_binprm bprm; |
| TaskState *ts; |
| CPUArchState *env; |
| CPUState *cpu; |
| int optind; |
| char **target_environ, **wrk; |
| char **target_argv; |
| int target_argc; |
| int i; |
| int ret; |
| int execfd; |
| int host_page_size; |
| unsigned long max_reserved_va; |
| bool preserve_argv0; |
| |
| error_init(argv[0]); |
| module_call_init(MODULE_INIT_TRACE); |
| qemu_init_cpu_list(); |
| module_call_init(MODULE_INIT_QOM); |
| |
| envlist = envlist_create(); |
| |
| /* |
| * add current environment into the list |
| * envlist_setenv adds to the front of the list; to preserve environ |
| * order add from back to front |
| */ |
| for (wrk = environ; *wrk != NULL; wrk++) { |
| continue; |
| } |
| while (wrk != environ) { |
| wrk--; |
| (void) envlist_setenv(envlist, *wrk); |
| } |
| |
| /* Read the stack limit from the kernel. If it's "unlimited", |
| then we can do little else besides use the default. */ |
| { |
| struct rlimit lim; |
| if (getrlimit(RLIMIT_STACK, &lim) == 0 |
| && lim.rlim_cur != RLIM_INFINITY |
| && lim.rlim_cur == (target_long)lim.rlim_cur |
| && lim.rlim_cur > guest_stack_size) { |
| guest_stack_size = lim.rlim_cur; |
| } |
| } |
| |
| cpu_model = NULL; |
| |
| qemu_add_opts(&qemu_trace_opts); |
| qemu_plugin_add_opts(); |
| |
| optind = parse_args(argc, argv); |
| |
| qemu_set_log_filename_flags(last_log_filename, |
| last_log_mask | (enable_strace * LOG_STRACE), |
| &error_fatal); |
| |
| if (!trace_init_backends()) { |
| exit(1); |
| } |
| trace_init_file(); |
| qemu_plugin_load_list(&plugins, &error_fatal); |
| |
| /* Zero out regs */ |
| memset(regs, 0, sizeof(struct target_pt_regs)); |
| |
| /* Zero out image_info */ |
| memset(info, 0, sizeof(struct image_info)); |
| |
| memset(&bprm, 0, sizeof (bprm)); |
| |
| /* Scan interp_prefix dir for replacement files. */ |
| init_paths(interp_prefix); |
| |
| init_qemu_uname_release(); |
| |
| /* |
| * Manage binfmt-misc open-binary flag |
| */ |
| execfd = qemu_getauxval(AT_EXECFD); |
| if (execfd == 0) { |
| execfd = open(exec_path, O_RDONLY); |
| if (execfd < 0) { |
| printf("Error while loading %s: %s\n", exec_path, strerror(errno)); |
| _exit(EXIT_FAILURE); |
| } |
| } |
| |
| /* Resolve executable file name to full path name */ |
| if (realpath(exec_path, real_exec_path)) { |
| exec_path = real_exec_path; |
| } |
| |
| /* |
| * get binfmt_misc flags |
| */ |
| preserve_argv0 = !!(qemu_getauxval(AT_FLAGS) & AT_FLAGS_PRESERVE_ARGV0); |
| |
| /* |
| * Manage binfmt-misc preserve-arg[0] flag |
| * argv[optind] full path to the binary |
| * argv[optind + 1] original argv[0] |
| */ |
| if (optind + 1 < argc && preserve_argv0) { |
| optind++; |
| } |
| |
| if (cpu_model == NULL) { |
| cpu_model = cpu_get_model(get_elf_eflags(execfd)); |
| } |
| cpu_type = parse_cpu_option(cpu_model); |
| |
| /* init tcg before creating CPUs */ |
| { |
| AccelState *accel = current_accel(); |
| AccelClass *ac = ACCEL_GET_CLASS(accel); |
| |
| accel_init_interfaces(ac); |
| object_property_set_bool(OBJECT(accel), "one-insn-per-tb", |
| opt_one_insn_per_tb, &error_abort); |
| ac->init_machine(NULL); |
| } |
| |
| /* |
| * Finalize page size before creating CPUs. |
| * This will do nothing if !TARGET_PAGE_BITS_VARY. |
| * The most efficient setting is to match the host. |
| */ |
| host_page_size = qemu_real_host_page_size(); |
| set_preferred_target_page_bits(ctz32(host_page_size)); |
| finalize_target_page_bits(); |
| |
| cpu = cpu_create(cpu_type); |
| env = cpu_env(cpu); |
| cpu_reset(cpu); |
| thread_cpu = cpu; |
| |
| /* |
| * Reserving too much vm space via mmap can run into problems |
| * with rlimits, oom due to page table creation, etc. We will |
| * still try it, if directed by the command-line option, but |
| * not by default. |
| */ |
| max_reserved_va = MAX_RESERVED_VA(cpu); |
| if (reserved_va != 0) { |
| if ((reserved_va + 1) % host_page_size) { |
| char *s = size_to_str(host_page_size); |
| fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s); |
| g_free(s); |
| exit(EXIT_FAILURE); |
| } |
| if (max_reserved_va && reserved_va > max_reserved_va) { |
| fprintf(stderr, "Reserved virtual address too big\n"); |
| exit(EXIT_FAILURE); |
| } |
| } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) { |
| /* MAX_RESERVED_VA + 1 is a large power of 2, so is aligned. */ |
| reserved_va = max_reserved_va; |
| } |
| |
| /* |
| * Temporarily disable |
| * "comparison is always false due to limited range of data type" |
| * due to comparison between (possible) uint64_t and uintptr_t. |
| */ |
| #pragma GCC diagnostic push |
| #pragma GCC diagnostic ignored "-Wtype-limits" |
| |
| /* |
| * Select an initial value for task_unmapped_base that is in range. |
| */ |
| if (reserved_va) { |
| if (TASK_UNMAPPED_BASE < reserved_va) { |
| task_unmapped_base = TASK_UNMAPPED_BASE; |
| } else { |
| /* The most common default formula is TASK_SIZE / 3. */ |
| task_unmapped_base = TARGET_PAGE_ALIGN(reserved_va / 3); |
| } |
| } else if (TASK_UNMAPPED_BASE < UINTPTR_MAX) { |
| task_unmapped_base = TASK_UNMAPPED_BASE; |
| } else { |
| /* 32-bit host: pick something medium size. */ |
| task_unmapped_base = 0x10000000; |
| } |
| mmap_next_start = task_unmapped_base; |
| |
| /* Similarly for elf_et_dyn_base. */ |
| if (reserved_va) { |
| if (ELF_ET_DYN_BASE < reserved_va) { |
| elf_et_dyn_base = ELF_ET_DYN_BASE; |
| } else { |
| /* The most common default formula is TASK_SIZE / 3 * 2. */ |
| elf_et_dyn_base = TARGET_PAGE_ALIGN(reserved_va / 3) * 2; |
| } |
| } else if (ELF_ET_DYN_BASE < UINTPTR_MAX) { |
| elf_et_dyn_base = ELF_ET_DYN_BASE; |
| } else { |
| /* 32-bit host: pick something medium size. */ |
| elf_et_dyn_base = 0x18000000; |
| } |
| |
| #pragma GCC diagnostic pop |
| |
| { |
| Error *err = NULL; |
| if (seed_optarg != NULL) { |
| qemu_guest_random_seed_main(seed_optarg, &err); |
| } else { |
| qcrypto_init(&err); |
| } |
| if (err) { |
| error_reportf_err(err, "cannot initialize crypto: "); |
| exit(1); |
| } |
| } |
| |
| target_environ = envlist_to_environ(envlist, NULL); |
| envlist_free(envlist); |
| |
| /* |
| * Read in mmap_min_addr kernel parameter. This value is used |
| * When loading the ELF image to determine whether guest_base |
| * is needed. It is also used in mmap_find_vma. |
| */ |
| { |
| FILE *fp; |
| |
| if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) { |
| unsigned long tmp; |
| if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) { |
| mmap_min_addr = MAX(tmp, host_page_size); |
| qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n", |
| mmap_min_addr); |
| } |
| fclose(fp); |
| } |
| } |
| |
| /* |
| * We prefer to not make NULL pointers accessible to QEMU. |
| * If we're in a chroot with no /proc, fall back to 1 page. |
| */ |
| if (mmap_min_addr == 0) { |
| mmap_min_addr = host_page_size; |
| qemu_log_mask(CPU_LOG_PAGE, |
| "host mmap_min_addr=0x%lx (fallback)\n", |
| mmap_min_addr); |
| } |
| |
| /* |
| * Prepare copy of argv vector for target. |
| */ |
| target_argc = argc - optind; |
| target_argv = g_new0(char *, target_argc + 1); |
| |
| /* |
| * If argv0 is specified (using '-0' switch) we replace |
| * argv[0] pointer with the given one. |
| */ |
| i = 0; |
| if (argv0 != NULL) { |
| target_argv[i++] = strdup(argv0); |
| } |
| for (; i < target_argc; i++) { |
| target_argv[i] = strdup(argv[optind + i]); |
| } |
| target_argv[target_argc] = NULL; |
| |
| ts = g_new0(TaskState, 1); |
| init_task_state(ts); |
| /* build Task State */ |
| ts->info = info; |
| ts->bprm = &bprm; |
| cpu->opaque = ts; |
| task_settid(ts); |
| |
| fd_trans_init(); |
| |
| ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs, |
| info, &bprm); |
| if (ret != 0) { |
| printf("Error while loading %s: %s\n", exec_path, strerror(-ret)); |
| _exit(EXIT_FAILURE); |
| } |
| |
| for (wrk = target_environ; *wrk; wrk++) { |
| g_free(*wrk); |
| } |
| |
| g_free(target_environ); |
| |
| if (qemu_loglevel_mask(CPU_LOG_PAGE)) { |
| FILE *f = qemu_log_trylock(); |
| if (f) { |
| fprintf(f, "guest_base %p\n", (void *)guest_base); |
| fprintf(f, "page layout changed following binary load\n"); |
| page_dump(f); |
| |
| fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n", |
| info->end_code); |
| fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n", |
| info->start_code); |
| fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n", |
| info->start_data); |
| fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n", |
| info->end_data); |
| fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n", |
| info->start_stack); |
| fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", |
| info->brk); |
| fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", |
| info->entry); |
| fprintf(f, "argv_start 0x" TARGET_ABI_FMT_lx "\n", |
| info->argv); |
| fprintf(f, "env_start 0x" TARGET_ABI_FMT_lx "\n", |
| info->envp); |
| fprintf(f, "auxv_start 0x" TARGET_ABI_FMT_lx "\n", |
| info->saved_auxv); |
| qemu_log_unlock(f); |
| } |
| } |
| |
| target_set_brk(info->brk); |
| syscall_init(); |
| signal_init(); |
| |
| /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay |
| generating the prologue until now so that the prologue can take |
| the real value of GUEST_BASE into account. */ |
| tcg_prologue_init(); |
| |
| target_cpu_copy_regs(env, regs); |
| |
| if (gdbstub) { |
| if (gdbserver_start(gdbstub) < 0) { |
| fprintf(stderr, "qemu: could not open gdbserver on %s\n", |
| gdbstub); |
| exit(EXIT_FAILURE); |
| } |
| gdb_handlesig(cpu, 0, NULL, NULL, 0); |
| } |
| |
| #ifdef CONFIG_SEMIHOSTING |
| qemu_semihosting_guestfd_init(); |
| #endif |
| |
| cpu_loop(env); |
| /* never exits */ |
| return 0; |
| } |
