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Commit | Line | Data |
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c1b0b93b JS |
1 | /* |
2 | * os-posix-lib.c | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * Copyright (c) 2010 Red Hat, Inc. | |
6 | * | |
7 | * QEMU library functions on POSIX which are shared between QEMU and | |
8 | * the QEMU tools. | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
26 | * THE SOFTWARE. | |
27 | */ | |
28 | ||
aafd7584 | 29 | #include "qemu/osdep.h" |
13401ba0 | 30 | #include <termios.h> |
13401ba0 | 31 | |
e2ea3515 LE |
32 | #include <glib/gprintf.h> |
33 | ||
9c17d615 | 34 | #include "sysemu/sysemu.h" |
c1b0b93b | 35 | #include "trace.h" |
da34e65c | 36 | #include "qapi/error.h" |
1de7afc9 | 37 | #include "qemu/sockets.h" |
10f5bff6 | 38 | #include <libgen.h> |
38183310 | 39 | #include <sys/signal.h> |
f348b6d1 | 40 | #include "qemu/cutils.h" |
c1b0b93b | 41 | |
cbcfa041 PB |
42 | #ifdef CONFIG_LINUX |
43 | #include <sys/syscall.h> | |
44 | #endif | |
cbcfa041 | 45 | |
41975b26 AF |
46 | #ifdef __FreeBSD__ |
47 | #include <sys/sysctl.h> | |
7dc9ae43 | 48 | #include <libutil.h> |
41975b26 AF |
49 | #endif |
50 | ||
a9c94277 | 51 | #include "qemu/mmap-alloc.h" |
794e8f30 | 52 | |
7d992e4d PL |
53 | #ifdef CONFIG_DEBUG_STACK_USAGE |
54 | #include "qemu/error-report.h" | |
55 | #endif | |
56 | ||
cbcfa041 PB |
57 | int qemu_get_thread_id(void) |
58 | { | |
59 | #if defined(__linux__) | |
60 | return syscall(SYS_gettid); | |
61 | #else | |
62 | return getpid(); | |
63 | #endif | |
64 | } | |
f97742d0 AR |
65 | |
66 | int qemu_daemon(int nochdir, int noclose) | |
67 | { | |
68 | return daemon(nochdir, noclose); | |
69 | } | |
70 | ||
b152aa84 | 71 | void *qemu_oom_check(void *ptr) |
c1b0b93b JS |
72 | { |
73 | if (ptr == NULL) { | |
74 | fprintf(stderr, "Failed to allocate memory: %s\n", strerror(errno)); | |
75 | abort(); | |
76 | } | |
77 | return ptr; | |
78 | } | |
c1b0b93b | 79 | |
7d2a35cc | 80 | void *qemu_try_memalign(size_t alignment, size_t size) |
c1b0b93b JS |
81 | { |
82 | void *ptr; | |
e5354657 KW |
83 | |
84 | if (alignment < sizeof(void*)) { | |
85 | alignment = sizeof(void*); | |
86 | } | |
87 | ||
c1b0b93b JS |
88 | #if defined(_POSIX_C_SOURCE) && !defined(__sun__) |
89 | int ret; | |
90 | ret = posix_memalign(&ptr, alignment, size); | |
91 | if (ret != 0) { | |
7d2a35cc KW |
92 | errno = ret; |
93 | ptr = NULL; | |
c1b0b93b JS |
94 | } |
95 | #elif defined(CONFIG_BSD) | |
7d2a35cc | 96 | ptr = valloc(size); |
c1b0b93b | 97 | #else |
7d2a35cc | 98 | ptr = memalign(alignment, size); |
c1b0b93b JS |
99 | #endif |
100 | trace_qemu_memalign(alignment, size, ptr); | |
101 | return ptr; | |
102 | } | |
103 | ||
7d2a35cc KW |
104 | void *qemu_memalign(size_t alignment, size_t size) |
105 | { | |
106 | return qemu_oom_check(qemu_try_memalign(alignment, size)); | |
107 | } | |
108 | ||
c1b0b93b | 109 | /* alloc shared memory pages */ |
a2b257d6 | 110 | void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment) |
c1b0b93b | 111 | { |
36b58628 | 112 | size_t align = QEMU_VMALLOC_ALIGN; |
794e8f30 | 113 | void *ptr = qemu_ram_mmap(-1, size, align, false); |
36b58628 | 114 | |
7dda5dc8 | 115 | if (ptr == MAP_FAILED) { |
39228250 | 116 | return NULL; |
c2a8238a | 117 | } |
c2a8238a | 118 | |
a2b257d6 IM |
119 | if (alignment) { |
120 | *alignment = align; | |
121 | } | |
c2dfc5ba | 122 | |
6eebf958 | 123 | trace_qemu_anon_ram_alloc(size, ptr); |
c7f4111a | 124 | return ptr; |
c1b0b93b JS |
125 | } |
126 | ||
127 | void qemu_vfree(void *ptr) | |
128 | { | |
129 | trace_qemu_vfree(ptr); | |
130 | free(ptr); | |
131 | } | |
9549e764 | 132 | |
e7a09b92 PB |
133 | void qemu_anon_ram_free(void *ptr, size_t size) |
134 | { | |
135 | trace_qemu_anon_ram_free(ptr, size); | |
794e8f30 | 136 | qemu_ram_munmap(ptr, size); |
e7a09b92 PB |
137 | } |
138 | ||
f9e8cacc | 139 | void qemu_set_block(int fd) |
154b9a0c PB |
140 | { |
141 | int f; | |
142 | f = fcntl(fd, F_GETFL); | |
143 | fcntl(fd, F_SETFL, f & ~O_NONBLOCK); | |
144 | } | |
145 | ||
f9e8cacc | 146 | void qemu_set_nonblock(int fd) |
9549e764 JS |
147 | { |
148 | int f; | |
149 | f = fcntl(fd, F_GETFL); | |
150 | fcntl(fd, F_SETFL, f | O_NONBLOCK); | |
151 | } | |
152 | ||
606600a1 SO |
153 | int socket_set_fast_reuse(int fd) |
154 | { | |
155 | int val = 1, ret; | |
156 | ||
157 | ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, | |
158 | (const char *)&val, sizeof(val)); | |
159 | ||
160 | assert(ret == 0); | |
161 | ||
162 | return ret; | |
163 | } | |
164 | ||
9549e764 JS |
165 | void qemu_set_cloexec(int fd) |
166 | { | |
167 | int f; | |
168 | f = fcntl(fd, F_GETFD); | |
169 | fcntl(fd, F_SETFD, f | FD_CLOEXEC); | |
170 | } | |
70e72ce4 JS |
171 | |
172 | /* | |
173 | * Creates a pipe with FD_CLOEXEC set on both file descriptors | |
174 | */ | |
175 | int qemu_pipe(int pipefd[2]) | |
176 | { | |
177 | int ret; | |
178 | ||
179 | #ifdef CONFIG_PIPE2 | |
180 | ret = pipe2(pipefd, O_CLOEXEC); | |
181 | if (ret != -1 || errno != ENOSYS) { | |
182 | return ret; | |
183 | } | |
184 | #endif | |
185 | ret = pipe(pipefd); | |
186 | if (ret == 0) { | |
187 | qemu_set_cloexec(pipefd[0]); | |
188 | qemu_set_cloexec(pipefd[1]); | |
189 | } | |
190 | ||
191 | return ret; | |
192 | } | |
38671423 | 193 | |
ae0f940e | 194 | int qemu_utimens(const char *path, const struct timespec *times) |
38671423 HS |
195 | { |
196 | struct timeval tv[2], tv_now; | |
197 | struct stat st; | |
198 | int i; | |
199 | #ifdef CONFIG_UTIMENSAT | |
200 | int ret; | |
201 | ||
ae0f940e | 202 | ret = utimensat(AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW); |
38671423 HS |
203 | if (ret != -1 || errno != ENOSYS) { |
204 | return ret; | |
205 | } | |
206 | #endif | |
207 | /* Fallback: use utimes() instead of utimensat() */ | |
208 | ||
209 | /* happy if special cases */ | |
210 | if (times[0].tv_nsec == UTIME_OMIT && times[1].tv_nsec == UTIME_OMIT) { | |
211 | return 0; | |
212 | } | |
213 | if (times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec == UTIME_NOW) { | |
214 | return utimes(path, NULL); | |
215 | } | |
216 | ||
217 | /* prepare for hard cases */ | |
218 | if (times[0].tv_nsec == UTIME_NOW || times[1].tv_nsec == UTIME_NOW) { | |
219 | gettimeofday(&tv_now, NULL); | |
220 | } | |
221 | if (times[0].tv_nsec == UTIME_OMIT || times[1].tv_nsec == UTIME_OMIT) { | |
222 | stat(path, &st); | |
223 | } | |
224 | ||
225 | for (i = 0; i < 2; i++) { | |
226 | if (times[i].tv_nsec == UTIME_NOW) { | |
227 | tv[i].tv_sec = tv_now.tv_sec; | |
228 | tv[i].tv_usec = tv_now.tv_usec; | |
229 | } else if (times[i].tv_nsec == UTIME_OMIT) { | |
230 | tv[i].tv_sec = (i == 0) ? st.st_atime : st.st_mtime; | |
231 | tv[i].tv_usec = 0; | |
232 | } else { | |
233 | tv[i].tv_sec = times[i].tv_sec; | |
234 | tv[i].tv_usec = times[i].tv_nsec / 1000; | |
235 | } | |
236 | } | |
237 | ||
238 | return utimes(path, &tv[0]); | |
239 | } | |
e2ea3515 LE |
240 | |
241 | char * | |
242 | qemu_get_local_state_pathname(const char *relative_pathname) | |
243 | { | |
244 | return g_strdup_printf("%s/%s", CONFIG_QEMU_LOCALSTATEDIR, | |
245 | relative_pathname); | |
246 | } | |
13401ba0 SH |
247 | |
248 | void qemu_set_tty_echo(int fd, bool echo) | |
249 | { | |
250 | struct termios tty; | |
251 | ||
252 | tcgetattr(fd, &tty); | |
253 | ||
254 | if (echo) { | |
255 | tty.c_lflag |= ECHO | ECHONL | ICANON | IEXTEN; | |
256 | } else { | |
257 | tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN); | |
258 | } | |
259 | ||
260 | tcsetattr(fd, TCSANOW, &tty); | |
261 | } | |
10f5bff6 FZ |
262 | |
263 | static char exec_dir[PATH_MAX]; | |
264 | ||
265 | void qemu_init_exec_dir(const char *argv0) | |
266 | { | |
267 | char *dir; | |
268 | char *p = NULL; | |
269 | char buf[PATH_MAX]; | |
270 | ||
271 | assert(!exec_dir[0]); | |
272 | ||
273 | #if defined(__linux__) | |
274 | { | |
275 | int len; | |
276 | len = readlink("/proc/self/exe", buf, sizeof(buf) - 1); | |
277 | if (len > 0) { | |
278 | buf[len] = 0; | |
279 | p = buf; | |
280 | } | |
281 | } | |
282 | #elif defined(__FreeBSD__) | |
283 | { | |
284 | static int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1}; | |
285 | size_t len = sizeof(buf) - 1; | |
286 | ||
287 | *buf = '\0'; | |
288 | if (!sysctl(mib, ARRAY_SIZE(mib), buf, &len, NULL, 0) && | |
289 | *buf) { | |
290 | buf[sizeof(buf) - 1] = '\0'; | |
291 | p = buf; | |
292 | } | |
293 | } | |
294 | #endif | |
295 | /* If we don't have any way of figuring out the actual executable | |
296 | location then try argv[0]. */ | |
297 | if (!p) { | |
298 | if (!argv0) { | |
299 | return; | |
300 | } | |
301 | p = realpath(argv0, buf); | |
302 | if (!p) { | |
303 | return; | |
304 | } | |
305 | } | |
55ad781c | 306 | dir = g_path_get_dirname(p); |
10f5bff6 FZ |
307 | |
308 | pstrcpy(exec_dir, sizeof(exec_dir), dir); | |
55ad781c WJ |
309 | |
310 | g_free(dir); | |
10f5bff6 FZ |
311 | } |
312 | ||
313 | char *qemu_get_exec_dir(void) | |
314 | { | |
315 | return g_strdup(exec_dir); | |
316 | } | |
38183310 PB |
317 | |
318 | static sigjmp_buf sigjump; | |
319 | ||
320 | static void sigbus_handler(int signal) | |
321 | { | |
322 | siglongjmp(sigjump, 1); | |
323 | } | |
324 | ||
056b68af | 325 | void os_mem_prealloc(int fd, char *area, size_t memory, Error **errp) |
38183310 | 326 | { |
b7bf8f56 | 327 | int ret; |
38183310 PB |
328 | struct sigaction act, oldact; |
329 | sigset_t set, oldset; | |
38183310 PB |
330 | |
331 | memset(&act, 0, sizeof(act)); | |
332 | act.sa_handler = &sigbus_handler; | |
333 | act.sa_flags = 0; | |
334 | ||
335 | ret = sigaction(SIGBUS, &act, &oldact); | |
336 | if (ret) { | |
056b68af IM |
337 | error_setg_errno(errp, errno, |
338 | "os_mem_prealloc: failed to install signal handler"); | |
339 | return; | |
38183310 PB |
340 | } |
341 | ||
342 | /* unblock SIGBUS */ | |
343 | sigemptyset(&set); | |
344 | sigaddset(&set, SIGBUS); | |
345 | pthread_sigmask(SIG_UNBLOCK, &set, &oldset); | |
346 | ||
347 | if (sigsetjmp(sigjump, 1)) { | |
056b68af IM |
348 | error_setg(errp, "os_mem_prealloc: Insufficient free host memory " |
349 | "pages available to allocate guest RAM\n"); | |
b7bf8f56 SW |
350 | } else { |
351 | int i; | |
7197fb40 | 352 | size_t hpagesize = qemu_fd_getpagesize(fd); |
2a0457bb | 353 | size_t numpages = DIV_ROUND_UP(memory, hpagesize); |
38183310 | 354 | |
b7bf8f56 | 355 | /* MAP_POPULATE silently ignores failures */ |
2a0457bb | 356 | for (i = 0; i < numpages; i++) { |
b7bf8f56 SW |
357 | memset(area + (hpagesize * i), 0, 1); |
358 | } | |
056b68af | 359 | } |
38183310 | 360 | |
056b68af IM |
361 | ret = sigaction(SIGBUS, &oldact, NULL); |
362 | if (ret) { | |
363 | /* Terminate QEMU since it can't recover from error */ | |
364 | perror("os_mem_prealloc: failed to reinstall signal handler"); | |
365 | exit(1); | |
b7bf8f56 | 366 | } |
056b68af | 367 | pthread_sigmask(SIG_SETMASK, &oldset, NULL); |
38183310 | 368 | } |
d57e4e48 DB |
369 | |
370 | ||
371 | static struct termios oldtty; | |
372 | ||
373 | static void term_exit(void) | |
374 | { | |
375 | tcsetattr(0, TCSANOW, &oldtty); | |
376 | } | |
377 | ||
378 | static void term_init(void) | |
379 | { | |
380 | struct termios tty; | |
381 | ||
382 | tcgetattr(0, &tty); | |
383 | oldtty = tty; | |
384 | ||
385 | tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP | |
386 | |INLCR|IGNCR|ICRNL|IXON); | |
387 | tty.c_oflag |= OPOST; | |
388 | tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN); | |
389 | tty.c_cflag &= ~(CSIZE|PARENB); | |
390 | tty.c_cflag |= CS8; | |
391 | tty.c_cc[VMIN] = 1; | |
392 | tty.c_cc[VTIME] = 0; | |
393 | ||
394 | tcsetattr(0, TCSANOW, &tty); | |
395 | ||
396 | atexit(term_exit); | |
397 | } | |
398 | ||
399 | int qemu_read_password(char *buf, int buf_size) | |
400 | { | |
401 | uint8_t ch; | |
402 | int i, ret; | |
403 | ||
404 | printf("password: "); | |
405 | fflush(stdout); | |
406 | term_init(); | |
407 | i = 0; | |
408 | for (;;) { | |
409 | ret = read(0, &ch, 1); | |
410 | if (ret == -1) { | |
411 | if (errno == EAGAIN || errno == EINTR) { | |
412 | continue; | |
413 | } else { | |
414 | break; | |
415 | } | |
416 | } else if (ret == 0) { | |
417 | ret = -1; | |
418 | break; | |
419 | } else { | |
6a11d518 DB |
420 | if (ch == '\r' || |
421 | ch == '\n') { | |
d57e4e48 DB |
422 | ret = 0; |
423 | break; | |
424 | } | |
425 | if (i < (buf_size - 1)) { | |
426 | buf[i++] = ch; | |
427 | } | |
428 | } | |
429 | } | |
430 | term_exit(); | |
431 | buf[i] = '\0'; | |
432 | printf("\n"); | |
433 | return ret; | |
434 | } | |
57cb38b3 DB |
435 | |
436 | ||
7dc9ae43 MP |
437 | char *qemu_get_pid_name(pid_t pid) |
438 | { | |
439 | char *name = NULL; | |
440 | ||
441 | #if defined(__FreeBSD__) | |
442 | /* BSDs don't have /proc, but they provide a nice substitute */ | |
443 | struct kinfo_proc *proc = kinfo_getproc(pid); | |
444 | ||
445 | if (proc) { | |
446 | name = g_strdup(proc->ki_comm); | |
447 | free(proc); | |
448 | } | |
449 | #else | |
450 | /* Assume a system with reasonable procfs */ | |
451 | char *pid_path; | |
452 | size_t len; | |
453 | ||
454 | pid_path = g_strdup_printf("/proc/%d/cmdline", pid); | |
455 | g_file_get_contents(pid_path, &name, &len, NULL); | |
456 | g_free(pid_path); | |
457 | #endif | |
458 | ||
459 | return name; | |
460 | } | |
461 | ||
462 | ||
57cb38b3 DB |
463 | pid_t qemu_fork(Error **errp) |
464 | { | |
465 | sigset_t oldmask, newmask; | |
466 | struct sigaction sig_action; | |
467 | int saved_errno; | |
468 | pid_t pid; | |
469 | ||
470 | /* | |
471 | * Need to block signals now, so that child process can safely | |
472 | * kill off caller's signal handlers without a race. | |
473 | */ | |
474 | sigfillset(&newmask); | |
475 | if (pthread_sigmask(SIG_SETMASK, &newmask, &oldmask) != 0) { | |
476 | error_setg_errno(errp, errno, | |
477 | "cannot block signals"); | |
478 | return -1; | |
479 | } | |
480 | ||
481 | pid = fork(); | |
482 | saved_errno = errno; | |
483 | ||
484 | if (pid < 0) { | |
485 | /* attempt to restore signal mask, but ignore failure, to | |
486 | * avoid obscuring the fork failure */ | |
487 | (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); | |
488 | error_setg_errno(errp, saved_errno, | |
489 | "cannot fork child process"); | |
490 | errno = saved_errno; | |
491 | return -1; | |
492 | } else if (pid) { | |
493 | /* parent process */ | |
494 | ||
495 | /* Restore our original signal mask now that the child is | |
496 | * safely running. Only documented failures are EFAULT (not | |
497 | * possible, since we are using just-grabbed mask) or EINVAL | |
498 | * (not possible, since we are using correct arguments). */ | |
499 | (void)pthread_sigmask(SIG_SETMASK, &oldmask, NULL); | |
500 | } else { | |
501 | /* child process */ | |
502 | size_t i; | |
503 | ||
504 | /* Clear out all signal handlers from parent so nothing | |
505 | * unexpected can happen in our child once we unblock | |
506 | * signals */ | |
507 | sig_action.sa_handler = SIG_DFL; | |
508 | sig_action.sa_flags = 0; | |
509 | sigemptyset(&sig_action.sa_mask); | |
510 | ||
511 | for (i = 1; i < NSIG; i++) { | |
512 | /* Only possible errors are EFAULT or EINVAL The former | |
513 | * won't happen, the latter we expect, so no need to check | |
514 | * return value */ | |
515 | (void)sigaction(i, &sig_action, NULL); | |
516 | } | |
517 | ||
518 | /* Unmask all signals in child, since we've no idea what the | |
519 | * caller's done with their signal mask and don't want to | |
520 | * propagate that to children */ | |
521 | sigemptyset(&newmask); | |
522 | if (pthread_sigmask(SIG_SETMASK, &newmask, NULL) != 0) { | |
523 | Error *local_err = NULL; | |
524 | error_setg_errno(&local_err, errno, | |
525 | "cannot unblock signals"); | |
526 | error_report_err(local_err); | |
527 | _exit(1); | |
528 | } | |
529 | } | |
530 | return pid; | |
531 | } | |
8737d9e0 PL |
532 | |
533 | void *qemu_alloc_stack(size_t *sz) | |
534 | { | |
535 | void *ptr, *guardpage; | |
7d992e4d PL |
536 | #ifdef CONFIG_DEBUG_STACK_USAGE |
537 | void *ptr2; | |
538 | #endif | |
8737d9e0 PL |
539 | size_t pagesz = getpagesize(); |
540 | #ifdef _SC_THREAD_STACK_MIN | |
541 | /* avoid stacks smaller than _SC_THREAD_STACK_MIN */ | |
542 | long min_stack_sz = sysconf(_SC_THREAD_STACK_MIN); | |
543 | *sz = MAX(MAX(min_stack_sz, 0), *sz); | |
544 | #endif | |
545 | /* adjust stack size to a multiple of the page size */ | |
546 | *sz = ROUND_UP(*sz, pagesz); | |
547 | /* allocate one extra page for the guard page */ | |
548 | *sz += pagesz; | |
549 | ||
550 | ptr = mmap(NULL, *sz, PROT_READ | PROT_WRITE, | |
551 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
552 | if (ptr == MAP_FAILED) { | |
553 | abort(); | |
554 | } | |
555 | ||
556 | #if defined(HOST_IA64) | |
557 | /* separate register stack */ | |
558 | guardpage = ptr + (((*sz - pagesz) / 2) & ~pagesz); | |
559 | #elif defined(HOST_HPPA) | |
560 | /* stack grows up */ | |
561 | guardpage = ptr + *sz - pagesz; | |
562 | #else | |
563 | /* stack grows down */ | |
564 | guardpage = ptr; | |
565 | #endif | |
566 | if (mprotect(guardpage, pagesz, PROT_NONE) != 0) { | |
567 | abort(); | |
568 | } | |
569 | ||
7d992e4d PL |
570 | #ifdef CONFIG_DEBUG_STACK_USAGE |
571 | for (ptr2 = ptr + pagesz; ptr2 < ptr + *sz; ptr2 += sizeof(uint32_t)) { | |
572 | *(uint32_t *)ptr2 = 0xdeadbeaf; | |
573 | } | |
574 | #endif | |
575 | ||
8737d9e0 PL |
576 | return ptr; |
577 | } | |
578 | ||
7d992e4d PL |
579 | #ifdef CONFIG_DEBUG_STACK_USAGE |
580 | static __thread unsigned int max_stack_usage; | |
581 | #endif | |
582 | ||
8737d9e0 PL |
583 | void qemu_free_stack(void *stack, size_t sz) |
584 | { | |
7d992e4d PL |
585 | #ifdef CONFIG_DEBUG_STACK_USAGE |
586 | unsigned int usage; | |
587 | void *ptr; | |
588 | ||
589 | for (ptr = stack + getpagesize(); ptr < stack + sz; | |
590 | ptr += sizeof(uint32_t)) { | |
591 | if (*(uint32_t *)ptr != 0xdeadbeaf) { | |
592 | break; | |
593 | } | |
594 | } | |
595 | usage = sz - (uintptr_t) (ptr - stack); | |
596 | if (usage > max_stack_usage) { | |
597 | error_report("thread %d max stack usage increased from %u to %u", | |
598 | qemu_get_thread_id(), max_stack_usage, usage); | |
599 | max_stack_usage = usage; | |
600 | } | |
601 | #endif | |
602 | ||
8737d9e0 PL |
603 | munmap(stack, sz); |
604 | } |