| /* |
| * qemu bsd user main |
| * |
| * Copyright (c) 2003-2008 Fabrice Bellard |
| * Copyright (c) 2013-14 Stacey Son |
| * |
| * 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 <sys/resource.h> |
| #include <sys/sysctl.h> |
| |
| #include "qemu/help-texts.h" |
| #include "qemu/units.h" |
| #include "qemu/accel.h" |
| #include "qemu-version.h" |
| #include <machine/trap.h> |
| |
| #include "qapi/error.h" |
| #include "qemu.h" |
| #include "qemu/config-file.h" |
| #include "qemu/error-report.h" |
| #include "qemu/path.h" |
| #include "qemu/help_option.h" |
| #include "qemu/module.h" |
| #include "qemu/plugin.h" |
| #include "user/guest-base.h" |
| #include "user/page-protection.h" |
| #include "tcg/startup.h" |
| #include "qemu/timer.h" |
| #include "qemu/envlist.h" |
| #include "qemu/cutils.h" |
| #include "exec/log.h" |
| #include "trace/control.h" |
| #include "crypto/init.h" |
| #include "qemu/guest-random.h" |
| #include "gdbstub/user.h" |
| #include "exec/page-vary.h" |
| |
| #include "host-os.h" |
| #include "target_arch_cpu.h" |
| |
| |
| /* |
| * TODO: Remove these and rely only on qemu_real_host_page_size(). |
| */ |
| uintptr_t qemu_host_page_size; |
| intptr_t qemu_host_page_mask; |
| |
| static bool opt_one_insn_per_tb; |
| static unsigned long opt_tb_size; |
| uintptr_t guest_base; |
| bool have_guest_base; |
| /* |
| * 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; |
| unsigned long guest_addr_max; |
| |
| const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; |
| const char *qemu_uname_release; |
| |
| unsigned long target_maxtsiz = TARGET_MAXTSIZ; /* max text size */ |
| unsigned long target_dfldsiz = TARGET_DFLDSIZ; /* initial data size limit */ |
| unsigned long target_maxdsiz = TARGET_MAXDSIZ; /* max data size */ |
| unsigned long target_dflssiz = TARGET_DFLSSIZ; /* initial data size limit */ |
| unsigned long target_maxssiz = TARGET_MAXSSIZ; /* max stack size */ |
| unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */ |
| |
| /* Helper routines for implementing atomic operations. */ |
| |
| 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(); |
| } |
| |
| void cpu_loop(CPUArchState *env) |
| { |
| target_cpu_loop(env); |
| } |
| |
| static void usage(void) |
| { |
| printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION |
| "\n" QEMU_COPYRIGHT "\n" |
| "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" |
| "BSD CPU emulator (compiled for %s emulation)\n" |
| "\n" |
| "Standard options:\n" |
| "-h print this help\n" |
| "-g port wait gdb connection to port\n" |
| "-L path set the elf interpreter prefix (default=%s)\n" |
| "-s size set the stack size in bytes (default=%ld)\n" |
| "-cpu model select CPU (-cpu help for list)\n" |
| "-drop-ld-preload drop LD_PRELOAD for target process\n" |
| "-E var=value sets/modifies targets environment variable(s)\n" |
| "-U var unsets targets environment variable(s)\n" |
| "-B address set guest_base address to address\n" |
| "\n" |
| "Debug options:\n" |
| "-d item1[,...] enable logging of specified items\n" |
| " (use '-d help' for a list of log items)\n" |
| "-D logfile write logs to 'logfile' (default stderr)\n" |
| "-one-insn-per-tb run with one guest instruction per emulated TB\n" |
| "-tb-size size TCG translation block cache size\n" |
| "-strace log system calls\n" |
| "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" |
| " specify tracing options\n" |
| #ifdef CONFIG_PLUGIN |
| "-plugin [file=]<file>[,<argname>=<argvalue>]\n" |
| #endif |
| "\n" |
| "Environment variables:\n" |
| "QEMU_STRACE Print system calls and arguments similar to the\n" |
| " 'strace' program. Enable by setting to any value.\n" |
| "You can use -E and -U options to set/unset environment variables\n" |
| "for target process. It is possible to provide several variables\n" |
| "by repeating the option. For example:\n" |
| " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" |
| "Note that if you provide several changes to single variable\n" |
| "last change will stay in effect.\n" |
| "\n" |
| QEMU_HELP_BOTTOM "\n" |
| , |
| TARGET_NAME, |
| interp_prefix, |
| target_dflssiz); |
| exit(1); |
| } |
| |
| __thread CPUState *thread_cpu; |
| |
| void stop_all_tasks(void) |
| { |
| /* |
| * We trust when using NPTL (pthreads) start_exclusive() handles thread |
| * stopping correctly. |
| */ |
| start_exclusive(); |
| } |
| |
| bool qemu_cpu_is_self(CPUState *cpu) |
| { |
| return thread_cpu == cpu; |
| } |
| |
| void qemu_cpu_kick(CPUState *cpu) |
| { |
| cpu_exit(cpu); |
| } |
| |
| /* Assumes contents are already zeroed. */ |
| static void init_task_state(TaskState *ts) |
| { |
| ts->sigaltstack_used = (struct target_sigaltstack) { |
| .ss_sp = 0, |
| .ss_size = 0, |
| .ss_flags = TARGET_SS_DISABLE, |
| }; |
| } |
| |
| static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins); |
| |
| void gemu_log(const char *fmt, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, fmt); |
| vfprintf(stderr, fmt, ap); |
| va_end(ap); |
| } |
| |
| static void |
| adjust_ssize(void) |
| { |
| struct rlimit rl; |
| |
| if (getrlimit(RLIMIT_STACK, &rl) != 0) { |
| return; |
| } |
| |
| target_maxssiz = MIN(target_maxssiz, rl.rlim_max); |
| target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); |
| |
| rl.rlim_max = target_maxssiz; |
| rl.rlim_cur = target_dflssiz; |
| setrlimit(RLIMIT_STACK, &rl); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| const char *filename; |
| const char *cpu_model; |
| const char *cpu_type; |
| const char *log_file = NULL; |
| const char *log_mask = NULL; |
| const char *seed_optarg = NULL; |
| struct target_pt_regs regs1, *regs = ®s1; |
| struct image_info info1, *info = &info1; |
| struct bsd_binprm bprm; |
| TaskState *ts; |
| CPUArchState *env; |
| CPUState *cpu; |
| int optind, rv; |
| const char *r; |
| const char *gdbstub = NULL; |
| char **target_environ, **wrk; |
| envlist_t *envlist = NULL; |
| char *argv0 = NULL; |
| int host_page_size; |
| unsigned long max_reserved_va; |
| |
| adjust_ssize(); |
| |
| if (argc <= 1) { |
| usage(); |
| } |
| |
| |
| 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); |
| } |
| |
| qemu_host_page_size = getpagesize(); |
| qemu_host_page_size = MAX(qemu_host_page_size, TARGET_PAGE_SIZE); |
| |
| cpu_model = NULL; |
| |
| qemu_add_opts(&qemu_trace_opts); |
| qemu_plugin_add_opts(); |
| |
| optind = 1; |
| for (;;) { |
| if (optind >= argc) { |
| break; |
| } |
| r = argv[optind]; |
| if (r[0] != '-') { |
| break; |
| } |
| optind++; |
| r++; |
| if (!strcmp(r, "-")) { |
| break; |
| } else if (!strcmp(r, "d")) { |
| if (optind >= argc) { |
| break; |
| } |
| log_mask = argv[optind++]; |
| } else if (!strcmp(r, "D")) { |
| if (optind >= argc) { |
| break; |
| } |
| log_file = argv[optind++]; |
| } else if (!strcmp(r, "E")) { |
| r = argv[optind++]; |
| if (envlist_setenv(envlist, r) != 0) { |
| usage(); |
| } |
| } else if (!strcmp(r, "ignore-environment")) { |
| envlist_free(envlist); |
| envlist = envlist_create(); |
| } else if (!strcmp(r, "U")) { |
| r = argv[optind++]; |
| if (envlist_unsetenv(envlist, r) != 0) { |
| usage(); |
| } |
| } else if (!strcmp(r, "s")) { |
| r = argv[optind++]; |
| rv = qemu_strtoul(r, &r, 0, &target_dflssiz); |
| if (rv < 0 || target_dflssiz <= 0) { |
| usage(); |
| } |
| if (*r == 'M') { |
| target_dflssiz *= 1024 * 1024; |
| } else if (*r == 'k' || *r == 'K') { |
| target_dflssiz *= 1024; |
| } |
| if (target_dflssiz > target_maxssiz) { |
| usage(); |
| } |
| } else if (!strcmp(r, "L")) { |
| interp_prefix = argv[optind++]; |
| } else if (!strcmp(r, "p")) { |
| unsigned size, want = qemu_real_host_page_size(); |
| |
| r = argv[optind++]; |
| if (qemu_strtoui(r, NULL, 10, &size) || size != want) { |
| warn_report("Deprecated page size option cannot " |
| "change host page size (%u)", want); |
| } |
| } else if (!strcmp(r, "g")) { |
| gdbstub = g_strdup(argv[optind++]); |
| } else if (!strcmp(r, "r")) { |
| qemu_uname_release = argv[optind++]; |
| } else if (!strcmp(r, "cpu")) { |
| cpu_model = argv[optind++]; |
| if (is_help_option(cpu_model)) { |
| list_cpus(); |
| exit(1); |
| } |
| } else if (!strcmp(r, "B")) { |
| rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); |
| if (rv < 0) { |
| usage(); |
| } |
| have_guest_base = true; |
| } else if (!strcmp(r, "drop-ld-preload")) { |
| (void) envlist_unsetenv(envlist, "LD_PRELOAD"); |
| } else if (!strcmp(r, "seed")) { |
| seed_optarg = optarg; |
| } else if (!strcmp(r, "one-insn-per-tb")) { |
| opt_one_insn_per_tb = true; |
| } else if (!strcmp(r, "tb-size")) { |
| r = argv[optind++]; |
| if (qemu_strtoul(r, NULL, 0, &opt_tb_size)) { |
| usage(); |
| } |
| } else if (!strcmp(r, "strace")) { |
| do_strace = 1; |
| } else if (!strcmp(r, "trace")) { |
| trace_opt_parse(optarg); |
| #ifdef CONFIG_PLUGIN |
| } else if (!strcmp(r, "plugin")) { |
| r = argv[optind++]; |
| qemu_plugin_opt_parse(r, &plugins); |
| #endif |
| } else if (!strcmp(r, "0")) { |
| argv0 = argv[optind++]; |
| } else { |
| usage(); |
| } |
| } |
| |
| qemu_host_page_mask = -qemu_host_page_size; |
| |
| /* init debug */ |
| { |
| int mask = 0; |
| if (log_mask) { |
| mask = qemu_str_to_log_mask(log_mask); |
| if (!mask) { |
| qemu_print_log_usage(stdout); |
| exit(1); |
| } |
| } |
| qemu_set_log_filename_flags(log_file, mask, &error_fatal); |
| } |
| |
| if (optind >= argc) { |
| usage(); |
| } |
| filename = argv[optind]; |
| if (argv0) { |
| argv[optind] = argv0; |
| } |
| |
| 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 bsd params */ |
| memset(&bprm, 0, sizeof(bprm)); |
| |
| /* Zero out image_info */ |
| memset(info, 0, sizeof(struct image_info)); |
| |
| /* Scan interp_prefix dir for replacement files. */ |
| init_paths(interp_prefix); |
| |
| if (cpu_model == NULL) { |
| cpu_model = TARGET_DEFAULT_CPU_MODEL; |
| } |
| |
| cpu_type = parse_cpu_option(cpu_model); |
| |
| /* init tcg before creating CPUs and to get qemu_host_page_size */ |
| { |
| 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); |
| object_property_set_int(OBJECT(accel), "tb-size", |
| opt_tb_size, &error_abort); |
| ac->init_machine(accel, 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. Unless we're running a |
| * target address space of 32 or fewer bits on a host with 64 bits. |
| */ |
| 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; |
| } |
| if (reserved_va != 0) { |
| guest_addr_max = reserved_va; |
| } else if (MIN(TARGET_VIRT_ADDR_SPACE_BITS, TARGET_ABI_BITS) <= 32) { |
| guest_addr_max = UINT32_MAX; |
| } else { |
| guest_addr_max = ~0ul; |
| } |
| |
| if (getenv("QEMU_STRACE")) { |
| do_strace = 1; |
| } |
| |
| target_environ = envlist_to_environ(envlist, NULL); |
| envlist_free(envlist); |
| |
| { |
| 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); |
| } |
| } |
| |
| /* |
| * Now that page sizes are configured we can do |
| * proper page alignment for guest_base. |
| */ |
| if (have_guest_base) { |
| if (guest_base & ~qemu_host_page_mask) { |
| error_report("Selected guest base not host page aligned"); |
| exit(1); |
| } |
| } |
| |
| /* |
| * If reserving host virtual address space, do so now. |
| * Combined with '-B', ensure that the chosen range is free. |
| */ |
| if (reserved_va) { |
| void *p; |
| |
| if (have_guest_base) { |
| p = mmap((void *)guest_base, reserved_va + 1, PROT_NONE, |
| MAP_ANON | MAP_PRIVATE | MAP_FIXED | MAP_EXCL, -1, 0); |
| } else { |
| p = mmap(NULL, reserved_va + 1, PROT_NONE, |
| MAP_ANON | MAP_PRIVATE, -1, 0); |
| } |
| if (p == MAP_FAILED) { |
| const char *err = strerror(errno); |
| char *sz = size_to_str(reserved_va + 1); |
| |
| if (have_guest_base) { |
| error_report("Cannot allocate %s bytes at -B %p for guest " |
| "address space: %s", sz, (void *)guest_base, err); |
| } else { |
| error_report("Cannot allocate %s bytes for guest " |
| "address space: %s", sz, err); |
| } |
| exit(1); |
| } |
| guest_base = (uintptr_t)p; |
| have_guest_base = true; |
| |
| /* Ensure that mmap_next_start is within range. */ |
| if (reserved_va <= mmap_next_start) { |
| mmap_next_start = (reserved_va / 4 * 3) |
| & TARGET_PAGE_MASK & qemu_host_page_mask; |
| } |
| } |
| |
| if (loader_exec(filename, argv + optind, target_environ, regs, info, |
| &bprm) != 0) { |
| printf("Error loading %s\n", filename); |
| _exit(1); |
| } |
| |
| 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); |
| |
| qemu_log_unlock(f); |
| } |
| } |
| |
| /* build Task State */ |
| ts = g_new0(TaskState, 1); |
| init_task_state(ts); |
| ts->info = info; |
| ts->bprm = &bprm; |
| ts->ts_tid = qemu_get_thread_id(); |
| cpu->opaque = ts; |
| |
| 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_init(env, regs); |
| |
| if (gdbstub) { |
| gdbserver_start(gdbstub, &error_fatal); |
| } |
| cpu_loop(env); |
| /* never exits */ |
| return 0; |
| } |
