4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2013-14 Stacey Son
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.
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.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include <sys/types.h>
23 #include <sys/resource.h>
24 #include <sys/sysctl.h>
26 #include "qemu/osdep.h"
27 #include "qemu-common.h"
28 #include "qemu/units.h"
29 #include "qemu/accel.h"
30 #include "sysemu/tcg.h"
31 #include "qemu-version.h"
32 #include <machine/trap.h>
34 #include "qapi/error.h"
36 #include "qemu/config-file.h"
37 #include "qemu/error-report.h"
38 #include "qemu/path.h"
39 #include "qemu/help_option.h"
40 #include "qemu/module.h"
41 #include "exec/exec-all.h"
43 #include "qemu/timer.h"
44 #include "qemu/envlist.h"
45 #include "qemu/cutils.h"
47 #include "trace/control.h"
48 #include "crypto/init.h"
49 #include "qemu/guest-random.h"
52 #include "target_arch_cpu.h"
58 * When running 32-on-64 we should make sure we can fit all of the possible
59 * guest address space into a contiguous chunk of virtual host memory.
61 * This way we will never overlap with our own libraries or binaries or stack
62 * or anything else that QEMU maps.
64 * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
65 * of the address for the kernel. Some cpus rely on this and user space
66 * uses the high bit(s) for pointer tagging and the like. For them, we
67 * must preserve the expected address space.
69 #ifndef MAX_RESERVED_VA
70 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
71 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
72 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
74 * There are a number of places where we assign reserved_va to a variable
75 * of type abi_ulong and expect it to fit. Avoid the last page.
77 # define MAX_RESERVED_VA (0xfffffffful & TARGET_PAGE_MASK)
79 # define MAX_RESERVED_VA (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
82 # define MAX_RESERVED_VA 0
87 * That said, reserving *too* much vm space via mmap can run into problems
88 * with rlimits, oom due to page table creation, etc. We will still try it,
89 * if directed by the command-line option, but not by default.
91 #if HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32
92 unsigned long reserved_va
= MAX_RESERVED_VA
;
94 unsigned long reserved_va
;
97 static const char *interp_prefix
= CONFIG_QEMU_INTERP_PREFIX
;
98 const char *qemu_uname_release
;
99 enum BSDType bsd_type
;
100 char qemu_proc_pathname
[PATH_MAX
]; /* full path to exeutable */
102 unsigned long target_maxtsiz
= TARGET_MAXTSIZ
; /* max text size */
103 unsigned long target_dfldsiz
= TARGET_DFLDSIZ
; /* initial data size limit */
104 unsigned long target_maxdsiz
= TARGET_MAXDSIZ
; /* max data size */
105 unsigned long target_dflssiz
= TARGET_DFLSSIZ
; /* initial data size limit */
106 unsigned long target_maxssiz
= TARGET_MAXSSIZ
; /* max stack size */
107 unsigned long target_sgrowsiz
= TARGET_SGROWSIZ
; /* amount to grow stack */
109 /* Helper routines for implementing atomic operations. */
111 void fork_start(void)
118 void fork_end(int child
)
121 CPUState
*cpu
, *next_cpu
;
123 * Child processes created by fork() only have a single thread. Discard
124 * information about the parent threads.
126 CPU_FOREACH_SAFE(cpu
, next_cpu
) {
127 if (cpu
!= thread_cpu
) {
128 QTAILQ_REMOVE_RCU(&cpus
, cpu
, node
);
131 mmap_fork_end(child
);
133 * qemu_init_cpu_list() takes care of reinitializing the exclusive
134 * state, so we don't need to end_exclusive() here.
136 qemu_init_cpu_list();
137 gdbserver_fork(thread_cpu
);
139 mmap_fork_end(child
);
145 void cpu_loop(CPUArchState
*env
)
147 target_cpu_loop(env
);
150 static void usage(void)
152 printf("qemu-" TARGET_NAME
" version " QEMU_FULL_VERSION
153 "\n" QEMU_COPYRIGHT
"\n"
154 "usage: qemu-" TARGET_NAME
" [options] program [arguments...]\n"
155 "BSD CPU emulator (compiled for %s emulation)\n"
157 "Standard options:\n"
158 "-h print this help\n"
159 "-g port wait gdb connection to port\n"
160 "-L path set the elf interpreter prefix (default=%s)\n"
161 "-s size set the stack size in bytes (default=%ld)\n"
162 "-cpu model select CPU (-cpu help for list)\n"
163 "-drop-ld-preload drop LD_PRELOAD for target process\n"
164 "-E var=value sets/modifies targets environment variable(s)\n"
165 "-U var unsets targets environment variable(s)\n"
166 "-B address set guest_base address to address\n"
167 "-bsd type select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
170 "-d item1[,...] enable logging of specified items\n"
171 " (use '-d help' for a list of log items)\n"
172 "-D logfile write logs to 'logfile' (default stderr)\n"
173 "-singlestep always run in singlestep mode\n"
174 "-strace log system calls\n"
175 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
176 " specify tracing options\n"
178 "Environment variables:\n"
179 "QEMU_STRACE Print system calls and arguments similar to the\n"
180 " 'strace' program. Enable by setting to any value.\n"
181 "You can use -E and -U options to set/unset environment variables\n"
182 "for target process. It is possible to provide several variables\n"
183 "by repeating the option. For example:\n"
184 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
185 "Note that if you provide several changes to single variable\n"
186 "last change will stay in effect.\n"
188 QEMU_HELP_BOTTOM
"\n"
196 __thread CPUState
*thread_cpu
;
198 void stop_all_tasks(void)
201 * We trust when using NPTL (pthreads) start_exclusive() handles thread
202 * stopping correctly.
207 bool qemu_cpu_is_self(CPUState
*cpu
)
209 return thread_cpu
== cpu
;
212 void qemu_cpu_kick(CPUState
*cpu
)
217 /* Assumes contents are already zeroed. */
218 static void init_task_state(TaskState
*ts
)
220 ts
->sigaltstack_used
= (struct target_sigaltstack
) {
223 .ss_flags
= TARGET_SS_DISABLE
,
227 void gemu_log(const char *fmt
, ...)
232 vfprintf(stderr
, fmt
, ap
);
241 if (getrlimit(RLIMIT_STACK
, &rl
) != 0) {
245 target_maxssiz
= MIN(target_maxssiz
, rl
.rlim_max
);
246 target_dflssiz
= MIN(MAX(target_dflssiz
, rl
.rlim_cur
), target_maxssiz
);
248 rl
.rlim_max
= target_maxssiz
;
249 rl
.rlim_cur
= target_dflssiz
;
250 setrlimit(RLIMIT_STACK
, &rl
);
253 static void save_proc_pathname(char *argv0
)
260 mib
[2] = KERN_PROC_PATHNAME
;
263 len
= sizeof(qemu_proc_pathname
);
264 if (sysctl(mib
, 4, qemu_proc_pathname
, &len
, NULL
, 0)) {
269 int main(int argc
, char **argv
)
271 const char *filename
;
272 const char *cpu_model
;
273 const char *cpu_type
;
274 const char *log_file
= NULL
;
275 const char *log_mask
= NULL
;
276 const char *seed_optarg
= NULL
;
277 struct target_pt_regs regs1
, *regs
= ®s1
;
278 struct image_info info1
, *info
= &info1
;
279 struct bsd_binprm bprm
;
285 const char *gdbstub
= NULL
;
286 char **target_environ
, **wrk
;
287 envlist_t
*envlist
= NULL
;
288 bsd_type
= HOST_DEFAULT_BSD_TYPE
;
297 save_proc_pathname(argv
[0]);
300 module_call_init(MODULE_INIT_TRACE
);
301 qemu_init_cpu_list();
302 module_call_init(MODULE_INIT_QOM
);
304 envlist
= envlist_create();
306 /* add current environment into the list */
307 for (wrk
= environ
; *wrk
!= NULL
; wrk
++) {
308 (void) envlist_setenv(envlist
, *wrk
);
313 qemu_add_opts(&qemu_trace_opts
);
317 if (optind
>= argc
) {
326 if (!strcmp(r
, "-")) {
328 } else if (!strcmp(r
, "d")) {
329 if (optind
>= argc
) {
332 log_mask
= argv
[optind
++];
333 } else if (!strcmp(r
, "D")) {
334 if (optind
>= argc
) {
337 log_file
= argv
[optind
++];
338 } else if (!strcmp(r
, "E")) {
340 if (envlist_setenv(envlist
, r
) != 0) {
343 } else if (!strcmp(r
, "ignore-environment")) {
344 envlist_free(envlist
);
345 envlist
= envlist_create();
346 } else if (!strcmp(r
, "U")) {
348 if (envlist_unsetenv(envlist
, r
) != 0) {
351 } else if (!strcmp(r
, "s")) {
353 rv
= qemu_strtoul(r
, &r
, 0, &target_dflssiz
);
354 if (rv
< 0 || target_dflssiz
<= 0) {
358 target_dflssiz
*= 1024 * 1024;
359 } else if (*r
== 'k' || *r
== 'K') {
360 target_dflssiz
*= 1024;
362 if (target_dflssiz
> target_maxssiz
) {
365 } else if (!strcmp(r
, "L")) {
366 interp_prefix
= argv
[optind
++];
367 } else if (!strcmp(r
, "p")) {
368 qemu_host_page_size
= atoi(argv
[optind
++]);
369 if (qemu_host_page_size
== 0 ||
370 (qemu_host_page_size
& (qemu_host_page_size
- 1)) != 0) {
371 fprintf(stderr
, "page size must be a power of two\n");
374 } else if (!strcmp(r
, "g")) {
375 gdbstub
= g_strdup(argv
[optind
++]);
376 } else if (!strcmp(r
, "r")) {
377 qemu_uname_release
= argv
[optind
++];
378 } else if (!strcmp(r
, "cpu")) {
379 cpu_model
= argv
[optind
++];
380 if (is_help_option(cpu_model
)) {
381 /* XXX: implement xxx_cpu_list for targets that still miss it */
382 #if defined(cpu_list)
387 } else if (!strcmp(r
, "B")) {
388 rv
= qemu_strtoul(argv
[optind
++], NULL
, 0, &guest_base
);
392 have_guest_base
= true;
393 } else if (!strcmp(r
, "drop-ld-preload")) {
394 (void) envlist_unsetenv(envlist
, "LD_PRELOAD");
395 } else if (!strcmp(r
, "bsd")) {
396 if (!strcasecmp(argv
[optind
], "freebsd")) {
397 bsd_type
= target_freebsd
;
398 } else if (!strcasecmp(argv
[optind
], "netbsd")) {
399 bsd_type
= target_netbsd
;
400 } else if (!strcasecmp(argv
[optind
], "openbsd")) {
401 bsd_type
= target_openbsd
;
406 } else if (!strcmp(r
, "seed")) {
407 seed_optarg
= optarg
;
408 } else if (!strcmp(r
, "singlestep")) {
410 } else if (!strcmp(r
, "strace")) {
412 } else if (!strcmp(r
, "trace")) {
413 trace_opt_parse(optarg
);
414 } else if (!strcmp(r
, "0")) {
415 argv0
= argv
[optind
++];
422 qemu_log_needs_buffers();
423 qemu_set_log_filename(log_file
, &error_fatal
);
427 mask
= qemu_str_to_log_mask(log_mask
);
429 qemu_print_log_usage(stdout
);
435 if (optind
>= argc
) {
438 filename
= argv
[optind
];
440 argv
[optind
] = argv0
;
443 if (!trace_init_backends()) {
449 memset(regs
, 0, sizeof(struct target_pt_regs
));
451 /* Zero bsd params */
452 memset(&bprm
, 0, sizeof(bprm
));
454 /* Zero out image_info */
455 memset(info
, 0, sizeof(struct image_info
));
457 /* Scan interp_prefix dir for replacement files. */
458 init_paths(interp_prefix
);
460 if (cpu_model
== NULL
) {
461 cpu_model
= TARGET_DEFAULT_CPU_MODEL
;
464 cpu_type
= parse_cpu_option(cpu_model
);
466 /* init tcg before creating CPUs and to get qemu_host_page_size */
468 AccelClass
*ac
= ACCEL_GET_CLASS(current_accel());
470 accel_init_interfaces(ac
);
471 ac
->init_machine(NULL
);
473 cpu
= cpu_create(cpu_type
);
478 if (getenv("QEMU_STRACE")) {
482 target_environ
= envlist_to_environ(envlist
, NULL
);
483 envlist_free(envlist
);
486 mmap_next_start
= reserved_va
;
491 if (seed_optarg
!= NULL
) {
492 qemu_guest_random_seed_main(seed_optarg
, &err
);
497 error_reportf_err(err
, "cannot initialize crypto: ");
503 * Now that page sizes are configured we can do
504 * proper page alignment for guest_base.
506 guest_base
= HOST_PAGE_ALIGN(guest_base
);
508 if (loader_exec(filename
, argv
+ optind
, target_environ
, regs
, info
,
510 printf("Error loading %s\n", filename
);
514 for (wrk
= target_environ
; *wrk
; wrk
++) {
518 g_free(target_environ
);
520 if (qemu_loglevel_mask(CPU_LOG_PAGE
)) {
521 qemu_log("guest_base %p\n", (void *)guest_base
);
522 log_page_dump("binary load");
524 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx
"\n", info
->start_brk
);
525 qemu_log("end_code 0x" TARGET_ABI_FMT_lx
"\n", info
->end_code
);
526 qemu_log("start_code 0x" TARGET_ABI_FMT_lx
"\n",
528 qemu_log("start_data 0x" TARGET_ABI_FMT_lx
"\n",
530 qemu_log("end_data 0x" TARGET_ABI_FMT_lx
"\n", info
->end_data
);
531 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx
"\n",
533 qemu_log("brk 0x" TARGET_ABI_FMT_lx
"\n", info
->brk
);
534 qemu_log("entry 0x" TARGET_ABI_FMT_lx
"\n", info
->entry
);
537 /* build Task State */
538 ts
= g_new0(TaskState
, 1);
544 target_set_brk(info
->brk
);
549 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay
550 * generating the prologue until now so that the prologue can take
551 * the real value of GUEST_BASE into account.
553 tcg_prologue_init(tcg_ctx
);
555 target_cpu_init(env
, regs
);
558 gdbserver_start(gdbstub
);
559 gdb_handlesig(cpu
, 0);