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 "qemu/osdep.h"
22 #include <sys/resource.h>
23 #include <sys/sysctl.h>
25 #include "qemu/help-texts.h"
26 #include "qemu/units.h"
27 #include "qemu/accel.h"
28 #include "qemu-version.h"
29 #include <machine/trap.h>
31 #include "qapi/error.h"
33 #include "qemu/config-file.h"
34 #include "qemu/error-report.h"
35 #include "qemu/path.h"
36 #include "qemu/help_option.h"
37 #include "qemu/module.h"
38 #include "exec/exec-all.h"
40 #include "qemu/timer.h"
41 #include "qemu/envlist.h"
42 #include "qemu/cutils.h"
44 #include "trace/control.h"
45 #include "crypto/init.h"
46 #include "qemu/guest-random.h"
49 #include "target_arch_cpu.h"
55 * When running 32-on-64 we should make sure we can fit all of the possible
56 * guest address space into a contiguous chunk of virtual host memory.
58 * This way we will never overlap with our own libraries or binaries or stack
59 * or anything else that QEMU maps.
61 * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
62 * of the address for the kernel. Some cpus rely on this and user space
63 * uses the high bit(s) for pointer tagging and the like. For them, we
64 * must preserve the expected address space.
66 #ifndef MAX_RESERVED_VA
67 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
68 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
69 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
71 * There are a number of places where we assign reserved_va to a variable
72 * of type abi_ulong and expect it to fit. Avoid the last page.
74 # define MAX_RESERVED_VA (0xfffffffful & TARGET_PAGE_MASK)
76 # define MAX_RESERVED_VA (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
79 # define MAX_RESERVED_VA 0
84 * That said, reserving *too* much vm space via mmap can run into problems
85 * with rlimits, oom due to page table creation, etc. We will still try it,
86 * if directed by the command-line option, but not by default.
88 #if HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32
89 unsigned long reserved_va
= MAX_RESERVED_VA
;
91 unsigned long reserved_va
;
94 static const char *interp_prefix
= CONFIG_QEMU_INTERP_PREFIX
;
95 const char *qemu_uname_release
;
96 char qemu_proc_pathname
[PATH_MAX
]; /* full path to exeutable */
98 unsigned long target_maxtsiz
= TARGET_MAXTSIZ
; /* max text size */
99 unsigned long target_dfldsiz
= TARGET_DFLDSIZ
; /* initial data size limit */
100 unsigned long target_maxdsiz
= TARGET_MAXDSIZ
; /* max data size */
101 unsigned long target_dflssiz
= TARGET_DFLSSIZ
; /* initial data size limit */
102 unsigned long target_maxssiz
= TARGET_MAXSSIZ
; /* max stack size */
103 unsigned long target_sgrowsiz
= TARGET_SGROWSIZ
; /* amount to grow stack */
105 /* Helper routines for implementing atomic operations. */
107 void fork_start(void)
114 void fork_end(int child
)
117 CPUState
*cpu
, *next_cpu
;
119 * Child processes created by fork() only have a single thread. Discard
120 * information about the parent threads.
122 CPU_FOREACH_SAFE(cpu
, next_cpu
) {
123 if (cpu
!= thread_cpu
) {
124 QTAILQ_REMOVE_RCU(&cpus
, cpu
, node
);
127 mmap_fork_end(child
);
129 * qemu_init_cpu_list() takes care of reinitializing the exclusive
130 * state, so we don't need to end_exclusive() here.
132 qemu_init_cpu_list();
133 gdbserver_fork(thread_cpu
);
135 mmap_fork_end(child
);
141 void cpu_loop(CPUArchState
*env
)
143 target_cpu_loop(env
);
146 static void usage(void)
148 printf("qemu-" TARGET_NAME
" version " QEMU_FULL_VERSION
149 "\n" QEMU_COPYRIGHT
"\n"
150 "usage: qemu-" TARGET_NAME
" [options] program [arguments...]\n"
151 "BSD CPU emulator (compiled for %s emulation)\n"
153 "Standard options:\n"
154 "-h print this help\n"
155 "-g port wait gdb connection to port\n"
156 "-L path set the elf interpreter prefix (default=%s)\n"
157 "-s size set the stack size in bytes (default=%ld)\n"
158 "-cpu model select CPU (-cpu help for list)\n"
159 "-drop-ld-preload drop LD_PRELOAD for target process\n"
160 "-E var=value sets/modifies targets environment variable(s)\n"
161 "-U var unsets targets environment variable(s)\n"
162 "-B address set guest_base address to address\n"
165 "-d item1[,...] enable logging of specified items\n"
166 " (use '-d help' for a list of log items)\n"
167 "-D logfile write logs to 'logfile' (default stderr)\n"
168 "-singlestep always run in singlestep mode\n"
169 "-strace log system calls\n"
170 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
171 " specify tracing options\n"
173 "Environment variables:\n"
174 "QEMU_STRACE Print system calls and arguments similar to the\n"
175 " 'strace' program. Enable by setting to any value.\n"
176 "You can use -E and -U options to set/unset environment variables\n"
177 "for target process. It is possible to provide several variables\n"
178 "by repeating the option. For example:\n"
179 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
180 "Note that if you provide several changes to single variable\n"
181 "last change will stay in effect.\n"
183 QEMU_HELP_BOTTOM
"\n"
191 __thread CPUState
*thread_cpu
;
193 void stop_all_tasks(void)
196 * We trust when using NPTL (pthreads) start_exclusive() handles thread
197 * stopping correctly.
202 bool qemu_cpu_is_self(CPUState
*cpu
)
204 return thread_cpu
== cpu
;
207 void qemu_cpu_kick(CPUState
*cpu
)
212 /* Assumes contents are already zeroed. */
213 static void init_task_state(TaskState
*ts
)
215 ts
->sigaltstack_used
= (struct target_sigaltstack
) {
218 .ss_flags
= TARGET_SS_DISABLE
,
222 void gemu_log(const char *fmt
, ...)
227 vfprintf(stderr
, fmt
, ap
);
236 if (getrlimit(RLIMIT_STACK
, &rl
) != 0) {
240 target_maxssiz
= MIN(target_maxssiz
, rl
.rlim_max
);
241 target_dflssiz
= MIN(MAX(target_dflssiz
, rl
.rlim_cur
), target_maxssiz
);
243 rl
.rlim_max
= target_maxssiz
;
244 rl
.rlim_cur
= target_dflssiz
;
245 setrlimit(RLIMIT_STACK
, &rl
);
248 static void save_proc_pathname(char *argv0
)
255 mib
[2] = KERN_PROC_PATHNAME
;
258 len
= sizeof(qemu_proc_pathname
);
259 if (sysctl(mib
, 4, qemu_proc_pathname
, &len
, NULL
, 0)) {
264 int main(int argc
, char **argv
)
266 const char *filename
;
267 const char *cpu_model
;
268 const char *cpu_type
;
269 const char *log_file
= NULL
;
270 const char *log_mask
= NULL
;
271 const char *seed_optarg
= NULL
;
272 struct target_pt_regs regs1
, *regs
= ®s1
;
273 struct image_info info1
, *info
= &info1
;
274 struct bsd_binprm bprm
;
280 const char *gdbstub
= NULL
;
281 char **target_environ
, **wrk
;
282 envlist_t
*envlist
= NULL
;
291 save_proc_pathname(argv
[0]);
294 module_call_init(MODULE_INIT_TRACE
);
295 qemu_init_cpu_list();
296 module_call_init(MODULE_INIT_QOM
);
298 envlist
= envlist_create();
300 /* add current environment into the list */
301 for (wrk
= environ
; *wrk
!= NULL
; wrk
++) {
302 (void) envlist_setenv(envlist
, *wrk
);
307 qemu_add_opts(&qemu_trace_opts
);
311 if (optind
>= argc
) {
320 if (!strcmp(r
, "-")) {
322 } else if (!strcmp(r
, "d")) {
323 if (optind
>= argc
) {
326 log_mask
= argv
[optind
++];
327 } else if (!strcmp(r
, "D")) {
328 if (optind
>= argc
) {
331 log_file
= argv
[optind
++];
332 } else if (!strcmp(r
, "E")) {
334 if (envlist_setenv(envlist
, r
) != 0) {
337 } else if (!strcmp(r
, "ignore-environment")) {
338 envlist_free(envlist
);
339 envlist
= envlist_create();
340 } else if (!strcmp(r
, "U")) {
342 if (envlist_unsetenv(envlist
, r
) != 0) {
345 } else if (!strcmp(r
, "s")) {
347 rv
= qemu_strtoul(r
, &r
, 0, &target_dflssiz
);
348 if (rv
< 0 || target_dflssiz
<= 0) {
352 target_dflssiz
*= 1024 * 1024;
353 } else if (*r
== 'k' || *r
== 'K') {
354 target_dflssiz
*= 1024;
356 if (target_dflssiz
> target_maxssiz
) {
359 } else if (!strcmp(r
, "L")) {
360 interp_prefix
= argv
[optind
++];
361 } else if (!strcmp(r
, "p")) {
362 qemu_host_page_size
= atoi(argv
[optind
++]);
363 if (qemu_host_page_size
== 0 ||
364 (qemu_host_page_size
& (qemu_host_page_size
- 1)) != 0) {
365 fprintf(stderr
, "page size must be a power of two\n");
368 } else if (!strcmp(r
, "g")) {
369 gdbstub
= g_strdup(argv
[optind
++]);
370 } else if (!strcmp(r
, "r")) {
371 qemu_uname_release
= argv
[optind
++];
372 } else if (!strcmp(r
, "cpu")) {
373 cpu_model
= argv
[optind
++];
374 if (is_help_option(cpu_model
)) {
375 /* XXX: implement xxx_cpu_list for targets that still miss it */
376 #if defined(cpu_list)
381 } else if (!strcmp(r
, "B")) {
382 rv
= qemu_strtoul(argv
[optind
++], NULL
, 0, &guest_base
);
386 have_guest_base
= true;
387 } else if (!strcmp(r
, "drop-ld-preload")) {
388 (void) envlist_unsetenv(envlist
, "LD_PRELOAD");
389 } else if (!strcmp(r
, "seed")) {
390 seed_optarg
= optarg
;
391 } else if (!strcmp(r
, "singlestep")) {
393 } else if (!strcmp(r
, "strace")) {
395 } else if (!strcmp(r
, "trace")) {
396 trace_opt_parse(optarg
);
397 } else if (!strcmp(r
, "0")) {
398 argv0
= argv
[optind
++];
408 mask
= qemu_str_to_log_mask(log_mask
);
410 qemu_print_log_usage(stdout
);
414 qemu_set_log_filename_flags(log_file
, mask
, &error_fatal
);
417 if (optind
>= argc
) {
420 filename
= argv
[optind
];
422 argv
[optind
] = argv0
;
425 if (!trace_init_backends()) {
431 memset(regs
, 0, sizeof(struct target_pt_regs
));
433 /* Zero bsd params */
434 memset(&bprm
, 0, sizeof(bprm
));
436 /* Zero out image_info */
437 memset(info
, 0, sizeof(struct image_info
));
439 /* Scan interp_prefix dir for replacement files. */
440 init_paths(interp_prefix
);
442 if (cpu_model
== NULL
) {
443 cpu_model
= TARGET_DEFAULT_CPU_MODEL
;
446 cpu_type
= parse_cpu_option(cpu_model
);
448 /* init tcg before creating CPUs and to get qemu_host_page_size */
450 AccelClass
*ac
= ACCEL_GET_CLASS(current_accel());
452 accel_init_interfaces(ac
);
453 ac
->init_machine(NULL
);
455 cpu
= cpu_create(cpu_type
);
460 if (getenv("QEMU_STRACE")) {
464 target_environ
= envlist_to_environ(envlist
, NULL
);
465 envlist_free(envlist
);
468 mmap_next_start
= reserved_va
;
473 if (seed_optarg
!= NULL
) {
474 qemu_guest_random_seed_main(seed_optarg
, &err
);
479 error_reportf_err(err
, "cannot initialize crypto: ");
485 * Now that page sizes are configured we can do
486 * proper page alignment for guest_base.
488 guest_base
= HOST_PAGE_ALIGN(guest_base
);
490 if (loader_exec(filename
, argv
+ optind
, target_environ
, regs
, info
,
492 printf("Error loading %s\n", filename
);
496 for (wrk
= target_environ
; *wrk
; wrk
++) {
500 g_free(target_environ
);
502 if (qemu_loglevel_mask(CPU_LOG_PAGE
)) {
503 FILE *f
= qemu_log_trylock();
505 fprintf(f
, "guest_base %p\n", (void *)guest_base
);
506 fprintf(f
, "page layout changed following binary load\n");
509 fprintf(f
, "start_brk 0x" TARGET_ABI_FMT_lx
"\n",
511 fprintf(f
, "end_code 0x" TARGET_ABI_FMT_lx
"\n",
513 fprintf(f
, "start_code 0x" TARGET_ABI_FMT_lx
"\n",
515 fprintf(f
, "start_data 0x" TARGET_ABI_FMT_lx
"\n",
517 fprintf(f
, "end_data 0x" TARGET_ABI_FMT_lx
"\n",
519 fprintf(f
, "start_stack 0x" TARGET_ABI_FMT_lx
"\n",
521 fprintf(f
, "brk 0x" TARGET_ABI_FMT_lx
"\n", info
->brk
);
522 fprintf(f
, "entry 0x" TARGET_ABI_FMT_lx
"\n", info
->entry
);
528 /* build Task State */
529 ts
= g_new0(TaskState
, 1);
535 target_set_brk(info
->brk
);
540 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay
541 * generating the prologue until now so that the prologue can take
542 * the real value of GUEST_BASE into account.
544 tcg_prologue_init(tcg_ctx
);
546 target_cpu_init(env
, regs
);
549 gdbserver_start(gdbstub
);
550 gdb_handlesig(cpu
, 0);