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84778508 1/*
4c0a4fe6 2 * qemu bsd user main
84778508
BS
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
4c0a4fe6 5 * Copyright (c) 2013-14 Stacey Son
84778508
BS
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
8167ee88 18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
84778508 19 */
14a48c1d 20
48e438a3 21#include "qemu/osdep.h"
312a0b1c
WL
22#include <sys/resource.h>
23#include <sys/sysctl.h>
24
49f95221 25#include "qemu/help-texts.h"
66d26ddb 26#include "qemu/units.h"
940e43aa 27#include "qemu/accel.h"
8c1c230a 28#include "qemu-version.h"
84778508
BS
29#include <machine/trap.h>
30
daa76aa4 31#include "qapi/error.h"
84778508 32#include "qemu.h"
6913e79c 33#include "qemu/config-file.h"
f5852efa 34#include "qemu/error-report.h"
f348b6d1
VB
35#include "qemu/path.h"
36#include "qemu/help_option.h"
0b8fa32f 37#include "qemu/module.h"
63c91552 38#include "exec/exec-all.h"
dcb32f1d 39#include "tcg/tcg.h"
1de7afc9
PB
40#include "qemu/timer.h"
41#include "qemu/envlist.h"
29aabb4f 42#include "qemu/cutils.h"
508127e2 43#include "exec/log.h"
6913e79c 44#include "trace/control.h"
03ecf078
WL
45#include "crypto/init.h"
46#include "qemu/guest-random.h"
d96bf49b 47#include "gdbstub/user.h"
fc0d96b4 48
d1dc9ab3 49#include "host-os.h"
031fe7af 50#include "target_arch_cpu.h"
d1dc9ab3 51
3cfb0456 52static bool opt_one_insn_per_tb;
5ca870b9 53uintptr_t guest_base;
e307c192 54bool have_guest_base;
be04f210
WL
55/*
56 * When running 32-on-64 we should make sure we can fit all of the possible
57 * guest address space into a contiguous chunk of virtual host memory.
58 *
59 * This way we will never overlap with our own libraries or binaries or stack
60 * or anything else that QEMU maps.
61 *
62 * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
63 * of the address for the kernel. Some cpus rely on this and user space
64 * uses the high bit(s) for pointer tagging and the like. For them, we
65 * must preserve the expected address space.
66 */
67#ifndef MAX_RESERVED_VA
68# if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
69# if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
70 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
95059f9c 71# define MAX_RESERVED_VA 0xfffffffful
be04f210 72# else
95059f9c 73# define MAX_RESERVED_VA ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
be04f210
WL
74# endif
75# else
76# define MAX_RESERVED_VA 0
77# endif
78#endif
79
80/*
81 * That said, reserving *too* much vm space via mmap can run into problems
82 * with rlimits, oom due to page table creation, etc. We will still try it,
83 * if directed by the command-line option, but not by default.
84 */
85#if HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32
86unsigned long reserved_va = MAX_RESERVED_VA;
87#else
d6ef40bf 88unsigned long reserved_va;
be04f210 89#endif
1b530a6d 90
7ee2822c 91static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
fccae322 92const char *qemu_uname_release;
01a298a5 93char qemu_proc_pathname[PATH_MAX]; /* full path to exeutable */
84778508 94
312a0b1c
WL
95unsigned long target_maxtsiz = TARGET_MAXTSIZ; /* max text size */
96unsigned long target_dfldsiz = TARGET_DFLDSIZ; /* initial data size limit */
97unsigned long target_maxdsiz = TARGET_MAXDSIZ; /* max data size */
98unsigned long target_dflssiz = TARGET_DFLSSIZ; /* initial data size limit */
99unsigned long target_maxssiz = TARGET_MAXSSIZ; /* max stack size */
100unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */
84778508 101
63cca106 102/* Helper routines for implementing atomic operations. */
9399f095 103
9399f095
BS
104void fork_start(void)
105{
63cca106
WL
106 start_exclusive();
107 cpu_list_lock();
108 mmap_fork_start();
9399f095
BS
109}
110
111void fork_end(int child)
112{
113 if (child) {
63cca106
WL
114 CPUState *cpu, *next_cpu;
115 /*
116 * Child processes created by fork() only have a single thread. Discard
117 * information about the parent threads.
118 */
119 CPU_FOREACH_SAFE(cpu, next_cpu) {
120 if (cpu != thread_cpu) {
121 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
122 }
123 }
124 mmap_fork_end(child);
125 /*
126 * qemu_init_cpu_list() takes care of reinitializing the exclusive
127 * state, so we don't need to end_exclusive() here.
128 */
129 qemu_init_cpu_list();
f7ec7f7b 130 gdbserver_fork(thread_cpu);
63cca106
WL
131 } else {
132 mmap_fork_end(child);
133 cpu_list_unlock();
134 end_exclusive();
9399f095
BS
135 }
136}
137
031fe7af 138void cpu_loop(CPUArchState *env)
31fc12df 139{
031fe7af 140 target_cpu_loop(env);
31fc12df
BS
141}
142
84778508
BS
143static void usage(void)
144{
7e563bfb 145 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
0781dd6e 146 "\n" QEMU_COPYRIGHT "\n"
2e59915d 147 "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
84778508
BS
148 "BSD CPU emulator (compiled for %s emulation)\n"
149 "\n"
150 "Standard options:\n"
151 "-h print this help\n"
152 "-g port wait gdb connection to port\n"
153 "-L path set the elf interpreter prefix (default=%s)\n"
154 "-s size set the stack size in bytes (default=%ld)\n"
c8057f95 155 "-cpu model select CPU (-cpu help for list)\n"
84778508 156 "-drop-ld-preload drop LD_PRELOAD for target process\n"
fc0d96b4
BS
157 "-E var=value sets/modifies targets environment variable(s)\n"
158 "-U var unsets targets environment variable(s)\n"
2fa5d9ba 159 "-B address set guest_base address to address\n"
84778508
BS
160 "\n"
161 "Debug options:\n"
989b697d
PM
162 "-d item1[,...] enable logging of specified items\n"
163 " (use '-d help' for a list of log items)\n"
164 "-D logfile write logs to 'logfile' (default stderr)\n"
060e0cd7
PM
165 "-one-insn-per-tb run with one guest instruction per emulated TB\n"
166 "-singlestep deprecated synonym for -one-insn-per-tb\n"
989b697d 167 "-strace log system calls\n"
6913e79c
LV
168 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
169 " specify tracing options\n"
84778508
BS
170 "\n"
171 "Environment variables:\n"
172 "QEMU_STRACE Print system calls and arguments similar to the\n"
173 " 'strace' program. Enable by setting to any value.\n"
fc0d96b4
BS
174 "You can use -E and -U options to set/unset environment variables\n"
175 "for target process. It is possible to provide several variables\n"
176 "by repeating the option. For example:\n"
177 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
178 "Note that if you provide several changes to single variable\n"
179 "last change will stay in effect.\n"
f5048cb7
EB
180 "\n"
181 QEMU_HELP_BOTTOM "\n"
84778508 182 ,
2e59915d 183 TARGET_NAME,
84778508 184 interp_prefix,
312a0b1c 185 target_dflssiz);
2d18e637 186 exit(1);
84778508
BS
187}
188
d42df502 189__thread CPUState *thread_cpu;
84778508 190
653ccec2
WL
191void stop_all_tasks(void)
192{
193 /*
194 * We trust when using NPTL (pthreads) start_exclusive() handles thread
195 * stopping correctly.
196 */
197 start_exclusive();
198}
199
48f59211
EM
200bool qemu_cpu_is_self(CPUState *cpu)
201{
202 return thread_cpu == cpu;
203}
204
205void qemu_cpu_kick(CPUState *cpu)
206{
207 cpu_exit(cpu);
208}
209
84778508 210/* Assumes contents are already zeroed. */
b46d4ad7 211static void init_task_state(TaskState *ts)
84778508 212{
46f4f76d
WL
213 ts->sigaltstack_used = (struct target_sigaltstack) {
214 .ss_sp = 0,
215 .ss_size = 0,
216 .ss_flags = TARGET_SS_DISABLE,
217 };
84778508
BS
218}
219
f0f7f9dc
WL
220void gemu_log(const char *fmt, ...)
221{
222 va_list ap;
223
224 va_start(ap, fmt);
225 vfprintf(stderr, fmt, ap);
226 va_end(ap);
227}
228
312a0b1c
WL
229static void
230adjust_ssize(void)
231{
232 struct rlimit rl;
233
234 if (getrlimit(RLIMIT_STACK, &rl) != 0) {
235 return;
236 }
237
238 target_maxssiz = MIN(target_maxssiz, rl.rlim_max);
239 target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz);
240
241 rl.rlim_max = target_maxssiz;
242 rl.rlim_cur = target_dflssiz;
243 setrlimit(RLIMIT_STACK, &rl);
244}
245
01a298a5
WL
246static void save_proc_pathname(char *argv0)
247{
248 int mib[4];
249 size_t len;
250
251 mib[0] = CTL_KERN;
252 mib[1] = KERN_PROC;
253 mib[2] = KERN_PROC_PATHNAME;
254 mib[3] = -1;
255
256 len = sizeof(qemu_proc_pathname);
257 if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) {
258 perror("sysctl");
259 }
260}
261
84778508
BS
262int main(int argc, char **argv)
263{
264 const char *filename;
265 const char *cpu_model;
2278b939 266 const char *cpu_type;
989b697d 267 const char *log_file = NULL;
c235d738 268 const char *log_mask = NULL;
03ecf078 269 const char *seed_optarg = NULL;
84778508
BS
270 struct target_pt_regs regs1, *regs = &regs1;
271 struct image_info info1, *info = &info1;
d37853f9 272 struct bsd_binprm bprm;
031fe7af 273 TaskState *ts;
9349b4f9 274 CPUArchState *env;
db6b81d4 275 CPUState *cpu;
29aabb4f 276 int optind, rv;
84778508 277 const char *r;
fcedd920 278 const char *gdbstub = NULL;
fc0d96b4
BS
279 char **target_environ, **wrk;
280 envlist_t *envlist = NULL;
b8012648 281 char *argv0 = NULL;
84778508 282
312a0b1c
WL
283 adjust_ssize();
284
b23a51dc 285 if (argc <= 1) {
84778508 286 usage();
b23a51dc 287 }
84778508 288
01a298a5
WL
289 save_proc_pathname(argv[0]);
290
f5852efa 291 error_init(argv[0]);
fe4db84d 292 module_call_init(MODULE_INIT_TRACE);
267f685b 293 qemu_init_cpu_list();
ce008c1f
AF
294 module_call_init(MODULE_INIT_QOM);
295
ec45bbe5 296 envlist = envlist_create();
fc0d96b4
BS
297
298 /* add current environment into the list */
299 for (wrk = environ; *wrk != NULL; wrk++) {
300 (void) envlist_setenv(envlist, *wrk);
301 }
302
84778508 303 cpu_model = NULL;
0c62de2f 304
6913e79c
LV
305 qemu_add_opts(&qemu_trace_opts);
306
84778508 307 optind = 1;
6913e79c 308 for (;;) {
b23a51dc 309 if (optind >= argc) {
84778508 310 break;
b23a51dc 311 }
84778508 312 r = argv[optind];
b23a51dc 313 if (r[0] != '-') {
84778508 314 break;
b23a51dc 315 }
84778508
BS
316 optind++;
317 r++;
318 if (!strcmp(r, "-")) {
319 break;
320 } else if (!strcmp(r, "d")) {
c235d738 321 if (optind >= argc) {
84778508 322 break;
84778508 323 }
c235d738
MF
324 log_mask = argv[optind++];
325 } else if (!strcmp(r, "D")) {
326 if (optind >= argc) {
327 break;
328 }
329 log_file = argv[optind++];
fc0d96b4
BS
330 } else if (!strcmp(r, "E")) {
331 r = argv[optind++];
b23a51dc 332 if (envlist_setenv(envlist, r) != 0) {
fc0d96b4 333 usage();
b23a51dc 334 }
f66724c9
SW
335 } else if (!strcmp(r, "ignore-environment")) {
336 envlist_free(envlist);
ec45bbe5 337 envlist = envlist_create();
fc0d96b4
BS
338 } else if (!strcmp(r, "U")) {
339 r = argv[optind++];
b23a51dc 340 if (envlist_unsetenv(envlist, r) != 0) {
fc0d96b4 341 usage();
b23a51dc 342 }
84778508
BS
343 } else if (!strcmp(r, "s")) {
344 r = argv[optind++];
312a0b1c
WL
345 rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
346 if (rv < 0 || target_dflssiz <= 0) {
84778508 347 usage();
b23a51dc
WL
348 }
349 if (*r == 'M') {
312a0b1c 350 target_dflssiz *= 1024 * 1024;
b23a51dc 351 } else if (*r == 'k' || *r == 'K') {
312a0b1c
WL
352 target_dflssiz *= 1024;
353 }
354 if (target_dflssiz > target_maxssiz) {
355 usage();
b23a51dc 356 }
84778508
BS
357 } else if (!strcmp(r, "L")) {
358 interp_prefix = argv[optind++];
359 } else if (!strcmp(r, "p")) {
360 qemu_host_page_size = atoi(argv[optind++]);
361 if (qemu_host_page_size == 0 ||
362 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
363 fprintf(stderr, "page size must be a power of two\n");
364 exit(1);
365 }
366 } else if (!strcmp(r, "g")) {
fcedd920 367 gdbstub = g_strdup(argv[optind++]);
84778508
BS
368 } else if (!strcmp(r, "r")) {
369 qemu_uname_release = argv[optind++];
370 } else if (!strcmp(r, "cpu")) {
371 cpu_model = argv[optind++];
c8057f95 372 if (is_help_option(cpu_model)) {
d60c3b93 373 /* XXX: implement xxx_cpu_list for targets that still miss it */
84778508 374#if defined(cpu_list)
d60c3b93 375 cpu_list();
84778508 376#endif
2d18e637 377 exit(1);
84778508 378 }
2fa5d9ba 379 } else if (!strcmp(r, "B")) {
29aabb4f
WL
380 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
381 if (rv < 0) {
382 usage();
383 }
d60c3b93 384 have_guest_base = true;
84778508 385 } else if (!strcmp(r, "drop-ld-preload")) {
fc0d96b4 386 (void) envlist_unsetenv(envlist, "LD_PRELOAD");
03ecf078
WL
387 } else if (!strcmp(r, "seed")) {
388 seed_optarg = optarg;
060e0cd7 389 } else if (!strcmp(r, "singlestep") || !strcmp(r, "one-insn-per-tb")) {
3cfb0456 390 opt_one_insn_per_tb = true;
84778508
BS
391 } else if (!strcmp(r, "strace")) {
392 do_strace = 1;
6913e79c 393 } else if (!strcmp(r, "trace")) {
92eecfff 394 trace_opt_parse(optarg);
b8012648
CP
395 } else if (!strcmp(r, "0")) {
396 argv0 = argv[optind++];
6913e79c 397 } else {
84778508
BS
398 usage();
399 }
400 }
84778508 401
c235d738 402 /* init debug */
905c78fe
RH
403 {
404 int mask = 0;
405 if (log_mask) {
406 mask = qemu_str_to_log_mask(log_mask);
407 if (!mask) {
408 qemu_print_log_usage(stdout);
409 exit(1);
410 }
c235d738 411 }
905c78fe 412 qemu_set_log_filename_flags(log_file, mask, &error_fatal);
c235d738
MF
413 }
414
4b5dfd82
PM
415 if (optind >= argc) {
416 usage();
417 }
418 filename = argv[optind];
b8012648
CP
419 if (argv0) {
420 argv[optind] = argv0;
421 }
4b5dfd82 422
6913e79c
LV
423 if (!trace_init_backends()) {
424 exit(1);
425 }
92eecfff 426 trace_init_file();
6913e79c 427
84778508
BS
428 /* Zero out regs */
429 memset(regs, 0, sizeof(struct target_pt_regs));
430
d37853f9
WL
431 /* Zero bsd params */
432 memset(&bprm, 0, sizeof(bprm));
433
84778508
BS
434 /* Zero out image_info */
435 memset(info, 0, sizeof(struct image_info));
436
437 /* Scan interp_prefix dir for replacement files. */
438 init_paths(interp_prefix);
439
440 if (cpu_model == NULL) {
031fe7af 441 cpu_model = TARGET_DEFAULT_CPU_MODEL;
84778508 442 }
2b5249b8 443
b86f59c7 444 cpu_type = parse_cpu_option(cpu_model);
031fe7af 445
2b5249b8 446 /* init tcg before creating CPUs and to get qemu_host_page_size */
940e43aa 447 {
3cfb0456
PM
448 AccelState *accel = current_accel();
449 AccelClass *ac = ACCEL_GET_CLASS(accel);
2b5249b8 450
b86f59c7 451 accel_init_interfaces(ac);
3cfb0456
PM
452 object_property_set_bool(OBJECT(accel), "one-insn-per-tb",
453 opt_one_insn_per_tb, &error_abort);
92242f34 454 ac->init_machine(NULL);
940e43aa 455 }
2278b939 456 cpu = cpu_create(cpu_type);
2994fd96 457 env = cpu->env_ptr;
db6b81d4 458 cpu_reset(cpu);
db6b81d4 459 thread_cpu = cpu;
84778508
BS
460
461 if (getenv("QEMU_STRACE")) {
462 do_strace = 1;
463 }
464
fc0d96b4
BS
465 target_environ = envlist_to_environ(envlist, NULL);
466 envlist_free(envlist);
467
be04f210 468 if (reserved_va) {
95059f9c 469 mmap_next_start = reserved_va + 1;
be04f210
WL
470 }
471
03ecf078
WL
472 {
473 Error *err = NULL;
474 if (seed_optarg != NULL) {
475 qemu_guest_random_seed_main(seed_optarg, &err);
476 } else {
477 qcrypto_init(&err);
478 }
479 if (err) {
480 error_reportf_err(err, "cannot initialize crypto: ");
481 exit(1);
482 }
483 }
484
2fa5d9ba 485 /*
fa79cde6 486 * Now that page sizes are configured we can do
2fa5d9ba
BS
487 * proper page alignment for guest_base.
488 */
489 guest_base = HOST_PAGE_ALIGN(guest_base);
490
d37853f9
WL
491 if (loader_exec(filename, argv + optind, target_environ, regs, info,
492 &bprm) != 0) {
84778508
BS
493 printf("Error loading %s\n", filename);
494 _exit(1);
495 }
496
497 for (wrk = target_environ; *wrk; wrk++) {
ec45bbe5 498 g_free(*wrk);
84778508
BS
499 }
500
ec45bbe5 501 g_free(target_environ);
84778508 502
13829020 503 if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
43b76161
RH
504 FILE *f = qemu_log_trylock();
505 if (f) {
506 fprintf(f, "guest_base %p\n", (void *)guest_base);
507 fprintf(f, "page layout changed following binary load\n");
508 page_dump(f);
509
510 fprintf(f, "start_brk 0x" TARGET_ABI_FMT_lx "\n",
511 info->start_brk);
512 fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n",
513 info->end_code);
514 fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n",
515 info->start_code);
516 fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n",
517 info->start_data);
518 fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n",
519 info->end_data);
520 fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n",
521 info->start_stack);
522 fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
523 fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
524
525 qemu_log_unlock(f);
526 }
2e77eac6 527 }
84778508 528
031fe7af
WL
529 /* build Task State */
530 ts = g_new0(TaskState, 1);
531 init_task_state(ts);
532 ts->info = info;
533 ts->bprm = &bprm;
534 cpu->opaque = ts;
535
84778508
BS
536 target_set_brk(info->brk);
537 syscall_init();
538 signal_init();
539
34bc8475
WL
540 /*
541 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay
542 * generating the prologue until now so that the prologue can take
543 * the real value of GUEST_BASE into account.
544 */
b1311c4a 545 tcg_prologue_init(tcg_ctx);
9002ec79 546
031fe7af 547 target_cpu_init(env, regs);
84778508 548
fcedd920
AB
549 if (gdbstub) {
550 gdbserver_start(gdbstub);
db6b81d4 551 gdb_handlesig(cpu, 0);
84778508 552 }
78cfb07f 553 cpu_loop(env);
84778508
BS
554 /* never exits */
555 return 0;
556}