1 //===-- sanitizer_linux.cc ------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is shared between AddressSanitizer and ThreadSanitizer
11 // run-time libraries and implements linux-specific functions from
13 //===----------------------------------------------------------------------===//
15 #include "sanitizer_platform.h"
17 #if SANITIZER_FREEBSD || SANITIZER_LINUX
19 #include "sanitizer_common.h"
20 #include "sanitizer_flags.h"
21 #include "sanitizer_internal_defs.h"
22 #include "sanitizer_libc.h"
23 #include "sanitizer_linux.h"
24 #include "sanitizer_mutex.h"
25 #include "sanitizer_placement_new.h"
26 #include "sanitizer_procmaps.h"
27 #include "sanitizer_stacktrace.h"
28 #include "sanitizer_symbolizer.h"
30 #if !SANITIZER_FREEBSD
31 #include <asm/param.h>
34 // For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat'
35 // format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To
36 // access stat from asm/stat.h, without conflicting with definition in
37 // sys/stat.h, we use this trick.
39 #include <asm/unistd.h>
40 #include <sys/types.h>
41 #define stat kernel_stat
53 #include <sys/ptrace.h>
54 #include <sys/resource.h>
56 #include <sys/syscall.h>
58 #include <sys/types.h>
64 #include <sys/sysctl.h>
65 #include <machine/atomic.h>
67 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on
68 // FreeBSD 9.2 and 10.0.
71 extern char **environ; // provided by crt1
72 #endif // SANITIZER_FREEBSD
74 #if !SANITIZER_ANDROID
75 #include <sys/signal.h>
78 #if SANITIZER_USE_GETAUXVAL
84 struct kernel_timeval {
89 // <linux/futex.h> is broken on some linux distributions.
90 const int FUTEX_WAIT = 0;
91 const int FUTEX_WAKE = 1;
92 #endif // SANITIZER_LINUX
94 // Are we using 32-bit or 64-bit Linux syscalls?
95 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32
96 // but it still needs to use 64-bit syscalls.
97 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \
98 SANITIZER_WORDSIZE == 64)
99 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1
101 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0
104 #if defined(__x86_64__) || SANITIZER_MIPS64
106 extern void internal_sigreturn();
110 namespace __sanitizer {
112 #if SANITIZER_LINUX && defined(__x86_64__)
113 #include "sanitizer_syscall_linux_x86_64.inc"
114 #elif SANITIZER_LINUX && defined(__aarch64__)
115 #include "sanitizer_syscall_linux_aarch64.inc"
117 #include "sanitizer_syscall_generic.inc"
120 // --------------- sanitizer_libc.h
122 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
124 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
125 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd,
128 // mmap2 specifies file offset in 4096-byte units.
129 CHECK(IsAligned(offset, 4096));
130 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd,
134 #endif // !SANITIZER_S390
136 uptr internal_munmap(void *addr, uptr length) {
137 return internal_syscall(SYSCALL(munmap), (uptr)addr, length);
140 int internal_mprotect(void *addr, uptr length, int prot) {
141 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot);
144 uptr internal_close(fd_t fd) {
145 return internal_syscall(SYSCALL(close), fd);
148 uptr internal_open(const char *filename, int flags) {
149 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
150 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags);
152 return internal_syscall(SYSCALL(open), (uptr)filename, flags);
156 uptr internal_open(const char *filename, int flags, u32 mode) {
157 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
158 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags,
161 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode);
165 uptr internal_read(fd_t fd, void *buf, uptr count) {
167 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf,
172 uptr internal_write(fd_t fd, const void *buf, uptr count) {
174 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf,
179 uptr internal_ftruncate(fd_t fd, uptr size) {
181 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd,
186 #if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && !SANITIZER_FREEBSD
187 static void stat64_to_stat(struct stat64 *in, struct stat *out) {
188 internal_memset(out, 0, sizeof(*out));
189 out->st_dev = in->st_dev;
190 out->st_ino = in->st_ino;
191 out->st_mode = in->st_mode;
192 out->st_nlink = in->st_nlink;
193 out->st_uid = in->st_uid;
194 out->st_gid = in->st_gid;
195 out->st_rdev = in->st_rdev;
196 out->st_size = in->st_size;
197 out->st_blksize = in->st_blksize;
198 out->st_blocks = in->st_blocks;
199 out->st_atime = in->st_atime;
200 out->st_mtime = in->st_mtime;
201 out->st_ctime = in->st_ctime;
202 out->st_ino = in->st_ino;
206 #if defined(__mips64)
207 static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) {
208 internal_memset(out, 0, sizeof(*out));
209 out->st_dev = in->st_dev;
210 out->st_ino = in->st_ino;
211 out->st_mode = in->st_mode;
212 out->st_nlink = in->st_nlink;
213 out->st_uid = in->st_uid;
214 out->st_gid = in->st_gid;
215 out->st_rdev = in->st_rdev;
216 out->st_size = in->st_size;
217 out->st_blksize = in->st_blksize;
218 out->st_blocks = in->st_blocks;
219 out->st_atime = in->st_atime_nsec;
220 out->st_mtime = in->st_mtime_nsec;
221 out->st_ctime = in->st_ctime_nsec;
222 out->st_ino = in->st_ino;
226 uptr internal_stat(const char *path, void *buf) {
227 #if SANITIZER_FREEBSD
228 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path,
230 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
231 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path,
233 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
234 # if defined(__mips64)
235 // For mips64, stat syscall fills buffer in the format of kernel_stat
236 struct kernel_stat kbuf;
237 int res = internal_syscall(SYSCALL(stat), path, &kbuf);
238 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
241 return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf);
245 int res = internal_syscall(SYSCALL(stat64), path, &buf64);
246 stat64_to_stat(&buf64, (struct stat *)buf);
251 uptr internal_lstat(const char *path, void *buf) {
252 #if SANITIZER_FREEBSD
253 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path,
254 (uptr)buf, AT_SYMLINK_NOFOLLOW);
255 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
256 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path,
257 (uptr)buf, AT_SYMLINK_NOFOLLOW);
258 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
259 # if SANITIZER_MIPS64
260 // For mips64, lstat syscall fills buffer in the format of kernel_stat
261 struct kernel_stat kbuf;
262 int res = internal_syscall(SYSCALL(lstat), path, &kbuf);
263 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
266 return internal_syscall(SYSCALL(lstat), (uptr)path, (uptr)buf);
270 int res = internal_syscall(SYSCALL(lstat64), path, &buf64);
271 stat64_to_stat(&buf64, (struct stat *)buf);
276 uptr internal_fstat(fd_t fd, void *buf) {
277 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
278 # if SANITIZER_MIPS64
279 // For mips64, fstat syscall fills buffer in the format of kernel_stat
280 struct kernel_stat kbuf;
281 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf);
282 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
285 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf);
289 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64);
290 stat64_to_stat(&buf64, (struct stat *)buf);
295 uptr internal_filesize(fd_t fd) {
297 if (internal_fstat(fd, &st))
299 return (uptr)st.st_size;
302 uptr internal_dup2(int oldfd, int newfd) {
303 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
304 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0);
306 return internal_syscall(SYSCALL(dup2), oldfd, newfd);
310 uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
311 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
312 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD,
313 (uptr)path, (uptr)buf, bufsize);
315 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize);
319 uptr internal_unlink(const char *path) {
320 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
321 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0);
323 return internal_syscall(SYSCALL(unlink), (uptr)path);
327 uptr internal_rename(const char *oldpath, const char *newpath) {
328 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
329 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD,
332 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath);
336 uptr internal_sched_yield() {
337 return internal_syscall(SYSCALL(sched_yield));
340 void internal__exit(int exitcode) {
341 #if SANITIZER_FREEBSD
342 internal_syscall(SYSCALL(exit), exitcode);
344 internal_syscall(SYSCALL(exit_group), exitcode);
346 Die(); // Unreachable.
349 unsigned int internal_sleep(unsigned int seconds) {
353 int res = internal_syscall(SYSCALL(nanosleep), &ts, &ts);
354 if (res) return ts.tv_sec;
358 uptr internal_execve(const char *filename, char *const argv[],
359 char *const envp[]) {
360 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv,
364 // ----------------- sanitizer_common.h
365 bool FileExists(const char *filename) {
367 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
368 if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0))
370 if (internal_stat(filename, &st))
373 // Sanity check: filename is a regular file.
374 return S_ISREG(st.st_mode);
378 #if SANITIZER_FREEBSD
379 return (uptr)pthread_self();
381 return internal_syscall(SYSCALL(gettid));
386 #if SANITIZER_FREEBSD
391 internal_memset(&tv, 0, sizeof(tv));
392 internal_syscall(SYSCALL(gettimeofday), (uptr)&tv, 0);
393 return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000;
396 // Like getenv, but reads env directly from /proc (on Linux) or parses the
397 // 'environ' array (on FreeBSD) and does not use libc. This function should be
398 // called first inside __asan_init.
399 const char *GetEnv(const char *name) {
400 #if SANITIZER_FREEBSD
401 if (::environ != 0) {
402 uptr NameLen = internal_strlen(name);
403 for (char **Env = ::environ; *Env != 0; Env++) {
404 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
405 return (*Env) + NameLen + 1;
408 return 0; // Not found.
409 #elif SANITIZER_LINUX
410 static char *environ;
416 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len))
419 if (!environ || len == 0) return nullptr;
420 uptr namelen = internal_strlen(name);
421 const char *p = environ;
422 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer
423 // proc file has the format NAME=value\0NAME=value\0NAME=value\0...
425 (char*)internal_memchr(p, '\0', len - (p - environ));
426 if (!endp) // this entry isn't NUL terminated
428 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match.
429 return p + namelen + 1; // point after =
432 return nullptr; // Not found.
434 #error "Unsupported platform"
438 #if !SANITIZER_FREEBSD
440 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end;
444 #if !SANITIZER_GO && !SANITIZER_FREEBSD
445 static void ReadNullSepFileToArray(const char *path, char ***arr,
450 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray");
451 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) {
457 for (count = 1, i = 1; ; i++) {
459 if (buff[i+1] == 0) break;
460 (*arr)[count] = &buff[i+1];
461 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible.
465 (*arr)[count] = nullptr;
469 static void GetArgsAndEnv(char ***argv, char ***envp) {
470 #if !SANITIZER_FREEBSD
472 if (&__libc_stack_end) {
474 uptr* stack_end = (uptr*)__libc_stack_end;
475 int argc = *stack_end;
476 *argv = (char**)(stack_end + 1);
477 *envp = (char**)(stack_end + argc + 2);
480 static const int kMaxArgv = 2000, kMaxEnvp = 2000;
481 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv);
482 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp);
486 // On FreeBSD, retrieving the argument and environment arrays is done via the
487 // kern.ps_strings sysctl, which returns a pointer to a structure containing
488 // this information. See also <sys/exec.h>.
490 size_t sz = sizeof(pss);
491 if (sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) {
492 Printf("sysctl kern.ps_strings failed\n");
495 *argv = pss->ps_argvstr;
496 *envp = pss->ps_envstr;
502 GetArgsAndEnv(&argv, &envp);
508 GetArgsAndEnv(&argv, &envp);
509 uptr rv = internal_execve("/proc/self/exe", argv, envp);
511 CHECK_EQ(internal_iserror(rv, &rverrno), true);
512 Printf("execve failed, errno %d\n", rverrno);
522 BlockingMutex::BlockingMutex() {
523 internal_memset(this, 0, sizeof(*this));
526 void BlockingMutex::Lock() {
528 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
529 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
531 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) {
532 #if SANITIZER_FREEBSD
533 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0);
535 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT, MtxSleeping, 0, 0, 0);
540 void BlockingMutex::Unlock() {
541 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
542 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release);
543 CHECK_NE(v, MtxUnlocked);
544 if (v == MtxSleeping) {
545 #if SANITIZER_FREEBSD
546 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0);
548 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE, 1, 0, 0, 0);
553 void BlockingMutex::CheckLocked() {
554 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
555 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed));
558 // ----------------- sanitizer_linux.h
559 // The actual size of this structure is specified by d_reclen.
560 // Note that getdents64 uses a different structure format. We only provide the
561 // 32-bit syscall here.
562 struct linux_dirent {
563 #if SANITIZER_X32 || defined(__aarch64__)
570 unsigned short d_reclen;
572 unsigned char d_type;
578 uptr internal_ptrace(int request, int pid, void *addr, void *data) {
579 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr,
583 uptr internal_waitpid(int pid, int *status, int options) {
584 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options,
588 uptr internal_getpid() {
589 return internal_syscall(SYSCALL(getpid));
592 uptr internal_getppid() {
593 return internal_syscall(SYSCALL(getppid));
596 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) {
597 #if SANITIZER_FREEBSD
598 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL);
599 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
600 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count);
602 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count);
606 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) {
607 return internal_syscall(SYSCALL(lseek), fd, offset, whence);
611 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) {
612 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5);
616 uptr internal_sigaltstack(const struct sigaltstack *ss,
617 struct sigaltstack *oss) {
618 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss);
621 int internal_fork() {
622 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
623 return internal_syscall(SYSCALL(clone), SIGCHLD, 0);
625 return internal_syscall(SYSCALL(fork));
630 #define SA_RESTORER 0x04000000
631 // Doesn't set sa_restorer if the caller did not set it, so use with caution
633 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) {
634 __sanitizer_kernel_sigaction_t k_act, k_oldact;
635 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t));
636 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t));
637 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act;
638 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact;
640 k_act.handler = u_act->handler;
641 k_act.sigaction = u_act->sigaction;
642 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask,
643 sizeof(__sanitizer_kernel_sigset_t));
644 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL).
645 k_act.sa_flags = u_act->sa_flags | SA_RESTORER;
646 // FIXME: most often sa_restorer is unset, however the kernel requires it
647 // to point to a valid signal restorer that calls the rt_sigreturn syscall.
648 // If sa_restorer passed to the kernel is NULL, the program may crash upon
649 // signal delivery or fail to unwind the stack in the signal handler.
650 // libc implementation of sigaction() passes its own restorer to
651 // rt_sigaction, so we need to do the same (we'll need to reimplement the
652 // restorers; for x86_64 the restorer address can be obtained from
653 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact).
654 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
655 k_act.sa_restorer = u_act->sa_restorer;
659 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum,
660 (uptr)(u_act ? &k_act : nullptr),
661 (uptr)(u_oldact ? &k_oldact : nullptr),
662 (uptr)sizeof(__sanitizer_kernel_sigset_t));
664 if ((result == 0) && u_oldact) {
665 u_oldact->handler = k_oldact.handler;
666 u_oldact->sigaction = k_oldact.sigaction;
667 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask,
668 sizeof(__sanitizer_kernel_sigset_t));
669 u_oldact->sa_flags = k_oldact.sa_flags;
670 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
671 u_oldact->sa_restorer = k_oldact.sa_restorer;
677 // Invokes sigaction via a raw syscall with a restorer, but does not support
678 // all platforms yet.
679 // We disable for Go simply because we have not yet added to buildgo.sh.
680 #if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
681 int internal_sigaction_syscall(int signum, const void *act, void *oldact) {
683 return internal_sigaction_norestorer(signum, act, oldact);
684 __sanitizer_sigaction u_adjust;
685 internal_memcpy(&u_adjust, act, sizeof(u_adjust));
686 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
687 if (u_adjust.sa_restorer == nullptr) {
688 u_adjust.sa_restorer = internal_sigreturn;
691 return internal_sigaction_norestorer(signum, (const void *)&u_adjust,
694 #endif // defined(__x86_64__) && !SANITIZER_GO
695 #endif // SANITIZER_LINUX
697 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
698 __sanitizer_sigset_t *oldset) {
699 #if SANITIZER_FREEBSD
700 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset);
702 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
703 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset;
704 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how,
705 (uptr)&k_set->sig[0], (uptr)&k_oldset->sig[0],
706 sizeof(__sanitizer_kernel_sigset_t));
710 void internal_sigfillset(__sanitizer_sigset_t *set) {
711 internal_memset(set, 0xff, sizeof(*set));
714 void internal_sigemptyset(__sanitizer_sigset_t *set) {
715 internal_memset(set, 0, sizeof(*set));
719 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
722 CHECK_LT(signum, sizeof(*set) * 8);
723 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
724 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
725 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
726 k_set->sig[idx] &= ~(1 << bit);
729 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
732 CHECK_LT(signum, sizeof(*set) * 8);
733 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
734 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
735 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
736 return k_set->sig[idx] & (1 << bit);
738 #endif // SANITIZER_LINUX
740 // ThreadLister implementation.
741 ThreadLister::ThreadLister(int pid)
746 entry_((struct linux_dirent *)buffer_.data()),
748 char task_directory_path[80];
749 internal_snprintf(task_directory_path, sizeof(task_directory_path),
750 "/proc/%d/task/", pid);
751 uptr openrv = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY);
752 if (internal_iserror(openrv)) {
754 Report("Can't open /proc/%d/task for reading.\n", pid);
757 descriptor_ = openrv;
761 int ThreadLister::GetNextTID() {
766 if ((char *)entry_ >= &buffer_[bytes_read_] && !GetDirectoryEntries())
768 if (entry_->d_ino != 0 && entry_->d_name[0] >= '0' &&
769 entry_->d_name[0] <= '9') {
770 // Found a valid tid.
771 tid = (int)internal_atoll(entry_->d_name);
773 entry_ = (struct linux_dirent *)(((char *)entry_) + entry_->d_reclen);
778 void ThreadLister::Reset() {
779 if (error_ || descriptor_ < 0)
781 internal_lseek(descriptor_, 0, SEEK_SET);
784 ThreadLister::~ThreadLister() {
785 if (descriptor_ >= 0)
786 internal_close(descriptor_);
789 bool ThreadLister::error() { return error_; }
791 bool ThreadLister::GetDirectoryEntries() {
792 CHECK_GE(descriptor_, 0);
793 CHECK_NE(error_, true);
794 bytes_read_ = internal_getdents(descriptor_,
795 (struct linux_dirent *)buffer_.data(),
797 if (internal_iserror(bytes_read_)) {
798 Report("Can't read directory entries from /proc/%d/task.\n", pid_);
801 } else if (bytes_read_ == 0) {
804 entry_ = (struct linux_dirent *)buffer_.data();
809 // Android post-M sysconf(_SC_PAGESIZE) crashes if called from .preinit_array.
810 #if SANITIZER_ANDROID
812 #elif SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__))
813 return EXEC_PAGESIZE;
814 #elif SANITIZER_USE_GETAUXVAL
815 return getauxval(AT_PAGESZ);
817 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy.
821 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
822 #if SANITIZER_FREEBSD
823 const int Mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
824 const char *default_module_name = "kern.proc.pathname";
825 size_t Size = buf_len;
826 bool IsErr = (sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0);
827 int readlink_error = IsErr ? errno : 0;
828 uptr module_name_len = Size;
830 const char *default_module_name = "/proc/self/exe";
831 uptr module_name_len = internal_readlink(
832 default_module_name, buf, buf_len);
834 bool IsErr = internal_iserror(module_name_len, &readlink_error);
837 // We can't read binary name for some reason, assume it's unknown.
838 Report("WARNING: reading executable name failed with errno %d, "
839 "some stack frames may not be symbolized\n", readlink_error);
840 module_name_len = internal_snprintf(buf, buf_len, "%s",
841 default_module_name);
842 CHECK_LT(module_name_len, buf_len);
844 return module_name_len;
847 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
852 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen,
854 internal_strncpy(buf, tmpbuf, buf_len);
855 UnmapOrDie(tmpbuf, tmpsize);
856 return internal_strlen(buf);
859 return ReadBinaryName(buf, buf_len);
862 // Match full names of the form /path/to/base_name{-,.}*
863 bool LibraryNameIs(const char *full_name, const char *base_name) {
864 const char *name = full_name;
866 while (*name != '\0') name++;
867 while (name > full_name && *name != '/') name--;
868 if (*name == '/') name++;
869 uptr base_name_length = internal_strlen(base_name);
870 if (internal_strncmp(name, base_name, base_name_length)) return false;
871 return (name[base_name_length] == '-' || name[base_name_length] == '.');
874 #if !SANITIZER_ANDROID
875 // Call cb for each region mapped by map.
876 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) {
877 CHECK_NE(map, nullptr);
878 #if !SANITIZER_FREEBSD
879 typedef ElfW(Phdr) Elf_Phdr;
880 typedef ElfW(Ehdr) Elf_Ehdr;
881 #endif // !SANITIZER_FREEBSD
882 char *base = (char *)map->l_addr;
883 Elf_Ehdr *ehdr = (Elf_Ehdr *)base;
884 char *phdrs = base + ehdr->e_phoff;
885 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize;
887 // Find the segment with the minimum base so we can "relocate" the p_vaddr
888 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC
889 // objects have a non-zero base.
890 uptr preferred_base = (uptr)-1;
891 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
892 Elf_Phdr *phdr = (Elf_Phdr *)iter;
893 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr)
894 preferred_base = (uptr)phdr->p_vaddr;
897 // Compute the delta from the real base to get a relocation delta.
898 sptr delta = (uptr)base - preferred_base;
899 // Now we can figure out what the loader really mapped.
900 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
901 Elf_Phdr *phdr = (Elf_Phdr *)iter;
902 if (phdr->p_type == PT_LOAD) {
903 uptr seg_start = phdr->p_vaddr + delta;
904 uptr seg_end = seg_start + phdr->p_memsz;
905 // None of these values are aligned. We consider the ragged edges of the
906 // load command as defined, since they are mapped from the file.
907 seg_start = RoundDownTo(seg_start, GetPageSizeCached());
908 seg_end = RoundUpTo(seg_end, GetPageSizeCached());
909 cb((void *)seg_start, seg_end - seg_start);
915 #if defined(__x86_64__) && SANITIZER_LINUX
916 // We cannot use glibc's clone wrapper, because it messes with the child
917 // task's TLS. It writes the PID and TID of the child task to its thread
918 // descriptor, but in our case the child task shares the thread descriptor with
919 // the parent (because we don't know how to allocate a new thread
920 // descriptor to keep glibc happy). So the stock version of clone(), when
921 // used with CLONE_VM, would end up corrupting the parent's thread descriptor.
922 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
923 int *parent_tidptr, void *newtls, int *child_tidptr) {
925 if (!fn || !child_stack)
927 CHECK_EQ(0, (uptr)child_stack % 16);
928 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
929 ((unsigned long long *)child_stack)[0] = (uptr)fn;
930 ((unsigned long long *)child_stack)[1] = (uptr)arg;
931 register void *r8 __asm__("r8") = newtls;
932 register int *r10 __asm__("r10") = child_tidptr;
933 __asm__ __volatile__(
934 /* %rax = syscall(%rax = SYSCALL(clone),
936 * %rsi = child_stack,
937 * %rdx = parent_tidptr,
939 * %r10 = child_tidptr)
946 "testq %%rax,%%rax\n"
949 /* In the child. Terminate unwind chain. */
950 // XXX: We should also terminate the CFI unwind chain
951 // here. Unfortunately clang 3.2 doesn't support the
952 // necessary CFI directives, so we skip that part.
955 /* Call "fn(arg)". */
960 /* Call _exit(%rax). */
965 /* Return to parent. */
968 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)),
974 : "rsp", "memory", "r11", "rcx");
977 #elif defined(__mips__)
978 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
979 int *parent_tidptr, void *newtls, int *child_tidptr) {
981 if (!fn || !child_stack)
983 CHECK_EQ(0, (uptr)child_stack % 16);
984 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
985 ((unsigned long long *)child_stack)[0] = (uptr)fn;
986 ((unsigned long long *)child_stack)[1] = (uptr)arg;
987 register void *a3 __asm__("$7") = newtls;
988 register int *a4 __asm__("$8") = child_tidptr;
989 // We don't have proper CFI directives here because it requires alot of code
990 // for very marginal benefits.
991 __asm__ __volatile__(
992 /* $v0 = syscall($v0 = __NR_clone,
995 * $a2 = parent_tidptr,
997 * $a4 = child_tidptr)
1004 /* Store the fifth argument on stack
1005 * if we are using 32-bit abi.
1007 #if SANITIZER_WORDSIZE == 32
1020 /* Call "fn(arg)". */
1021 #if SANITIZER_WORDSIZE == 32
1022 #ifdef __BIG_ENDIAN__
1035 /* Call _exit($v0). */
1040 /* Return to parent. */
1050 : "memory", "$29" );
1053 #elif defined(__aarch64__)
1054 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1055 int *parent_tidptr, void *newtls, int *child_tidptr) {
1057 if (!fn || !child_stack)
1059 CHECK_EQ(0, (uptr)child_stack % 16);
1060 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1061 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1062 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1064 register int (*__fn)(void *) __asm__("x0") = fn;
1065 register void *__stack __asm__("x1") = child_stack;
1066 register int __flags __asm__("x2") = flags;
1067 register void *__arg __asm__("x3") = arg;
1068 register int *__ptid __asm__("x4") = parent_tidptr;
1069 register void *__tls __asm__("x5") = newtls;
1070 register int *__ctid __asm__("x6") = child_tidptr;
1072 __asm__ __volatile__(
1073 "mov x0,x2\n" /* flags */
1074 "mov x2,x4\n" /* ptid */
1075 "mov x3,x5\n" /* tls */
1076 "mov x4,x6\n" /* ctid */
1077 "mov x8,%9\n" /* clone */
1087 /* In the child, now. Call "fn(arg)". */
1088 "ldp x1, x0, [sp], #16\n"
1091 /* Call _exit(%r0). */
1098 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg),
1099 "r"(__ptid), "r"(__tls), "r"(__ctid),
1100 "i"(__NR_clone), "i"(__NR_exit)
1104 #elif defined(__powerpc64__)
1105 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1106 int *parent_tidptr, void *newtls, int *child_tidptr) {
1108 // Stack frame structure.
1109 #if SANITIZER_PPC64V1
1110 // Back chain == 0 (SP + 112)
1111 // Frame (112 bytes):
1112 // Parameter save area (SP + 48), 8 doublewords
1113 // TOC save area (SP + 40)
1114 // Link editor doubleword (SP + 32)
1115 // Compiler doubleword (SP + 24)
1116 // LR save area (SP + 16)
1117 // CR save area (SP + 8)
1118 // Back chain (SP + 0)
1119 # define FRAME_SIZE 112
1120 # define FRAME_TOC_SAVE_OFFSET 40
1121 #elif SANITIZER_PPC64V2
1122 // Back chain == 0 (SP + 32)
1123 // Frame (32 bytes):
1124 // TOC save area (SP + 24)
1125 // LR save area (SP + 16)
1126 // CR save area (SP + 8)
1127 // Back chain (SP + 0)
1128 # define FRAME_SIZE 32
1129 # define FRAME_TOC_SAVE_OFFSET 24
1131 # error "Unsupported PPC64 ABI"
1133 if (!fn || !child_stack)
1135 CHECK_EQ(0, (uptr)child_stack % 16);
1137 register int (*__fn)(void *) __asm__("r3") = fn;
1138 register void *__cstack __asm__("r4") = child_stack;
1139 register int __flags __asm__("r5") = flags;
1140 register void *__arg __asm__("r6") = arg;
1141 register int *__ptidptr __asm__("r7") = parent_tidptr;
1142 register void *__newtls __asm__("r8") = newtls;
1143 register int *__ctidptr __asm__("r9") = child_tidptr;
1145 __asm__ __volatile__(
1146 /* fn and arg are saved across the syscall */
1156 r7 == child_tidptr */
1164 /* Test if syscall was successful */
1165 "cmpdi cr1, 3, 0\n\t"
1166 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t"
1169 /* Set up stack frame */
1171 "stdu 29, -8(1)\n\t"
1172 "stdu 1, -%12(1)\n\t"
1173 /* Do the function call */
1175 #if SANITIZER_PPC64V1
1179 #elif SANITIZER_PPC64V2
1183 # error "Unsupported PPC64 ABI"
1189 /* Call _exit(r3) */
1193 /* Return to parent */
1209 "i" (FRAME_TOC_SAVE_OFFSET)
1210 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29");
1213 #elif defined(__i386__) && SANITIZER_LINUX
1214 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1215 int *parent_tidptr, void *newtls, int *child_tidptr) {
1217 if (!fn || !child_stack)
1219 CHECK_EQ(0, (uptr)child_stack % 16);
1220 child_stack = (char *)child_stack - 7 * sizeof(unsigned int);
1221 ((unsigned int *)child_stack)[0] = (uptr)flags;
1222 ((unsigned int *)child_stack)[1] = (uptr)0;
1223 ((unsigned int *)child_stack)[2] = (uptr)fn;
1224 ((unsigned int *)child_stack)[3] = (uptr)arg;
1225 __asm__ __volatile__(
1226 /* %eax = syscall(%eax = SYSCALL(clone),
1228 * %ecx = child_stack,
1229 * %edx = parent_tidptr,
1231 * %edi = child_tidptr)
1235 "movl (%%ecx), %%ebx\n"
1236 /* Do the system call */
1240 /* Remember the flag value. */
1241 "movl %%ebx, (%%ecx)\n"
1251 "test %%eax,%%eax\n"
1254 /* terminate the stack frame */
1255 "xorl %%ebp,%%ebp\n"
1262 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n"
1265 "movl %%eax, %%ebx\n"
1270 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)),
1278 #elif defined(__arm__) && SANITIZER_LINUX
1279 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1280 int *parent_tidptr, void *newtls, int *child_tidptr) {
1282 if (!fn || !child_stack)
1284 child_stack = (char *)child_stack - 2 * sizeof(unsigned int);
1285 ((unsigned int *)child_stack)[0] = (uptr)fn;
1286 ((unsigned int *)child_stack)[1] = (uptr)arg;
1287 register int r0 __asm__("r0") = flags;
1288 register void *r1 __asm__("r1") = child_stack;
1289 register int *r2 __asm__("r2") = parent_tidptr;
1290 register void *r3 __asm__("r3") = newtls;
1291 register int *r4 __asm__("r4") = child_tidptr;
1292 register int r7 __asm__("r7") = __NR_clone;
1294 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__)
1295 # define ARCH_HAS_BX
1298 # define ARCH_HAS_BLX
1302 # ifdef ARCH_HAS_BLX
1303 # define BLX(R) "blx " #R "\n"
1305 # define BLX(R) "mov lr, pc; bx " #R "\n"
1308 # define BLX(R) "mov lr, pc; mov pc," #R "\n"
1311 __asm__ __volatile__(
1312 /* %r0 = syscall(%r7 = SYSCALL(clone),
1314 * %r1 = child_stack,
1315 * %r2 = parent_tidptr,
1317 * %r4 = child_tidptr)
1320 /* Do the system call */
1329 /* In the child, now. Call "fn(arg)". */
1330 "ldr r0, [sp, #4]\n"
1331 "ldr ip, [sp], #8\n"
1333 /* Call _exit(%r0). */
1339 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7),
1344 #endif // defined(__x86_64__) && SANITIZER_LINUX
1346 #if SANITIZER_ANDROID
1347 #if __ANDROID_API__ < 21
1348 extern "C" __attribute__((weak)) int dl_iterate_phdr(
1349 int (*)(struct dl_phdr_info *, size_t, void *), void *);
1352 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size,
1354 // Any name starting with "lib" indicates a bug in L where library base names
1355 // are returned instead of paths.
1356 if (info->dlpi_name && info->dlpi_name[0] == 'l' &&
1357 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') {
1358 *(bool *)data = true;
1364 static atomic_uint32_t android_api_level;
1366 static AndroidApiLevel AndroidDetectApiLevel() {
1367 if (!&dl_iterate_phdr)
1368 return ANDROID_KITKAT; // K or lower
1369 bool base_name_seen = false;
1370 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen);
1372 return ANDROID_LOLLIPOP_MR1; // L MR1
1373 return ANDROID_POST_LOLLIPOP; // post-L
1374 // Plain L (API level 21) is completely broken wrt ASan and not very
1375 // interesting to detect.
1378 AndroidApiLevel AndroidGetApiLevel() {
1379 AndroidApiLevel level =
1380 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed);
1381 if (level) return level;
1382 level = AndroidDetectApiLevel();
1383 atomic_store(&android_api_level, level, memory_order_relaxed);
1389 HandleSignalMode GetHandleSignalMode(int signum) {
1392 return common_flags()->handle_abort;
1394 return common_flags()->handle_sigill;
1396 return common_flags()->handle_sigfpe;
1398 return common_flags()->handle_segv;
1400 return common_flags()->handle_sigbus;
1402 return kHandleSignalNo;
1406 void *internal_start_thread(void(*func)(void *arg), void *arg) {
1407 // Start the thread with signals blocked, otherwise it can steal user signals.
1408 __sanitizer_sigset_t set, old;
1409 internal_sigfillset(&set);
1410 #if SANITIZER_LINUX && !SANITIZER_ANDROID
1411 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked
1412 // on any thread, setuid call hangs (see test/tsan/setuid.c).
1413 internal_sigdelset(&set, 33);
1415 internal_sigprocmask(SIG_SETMASK, &set, &old);
1417 real_pthread_create(&th, nullptr, (void*(*)(void *arg))func, arg);
1418 internal_sigprocmask(SIG_SETMASK, &old, nullptr);
1422 void internal_join_thread(void *th) {
1423 real_pthread_join(th, nullptr);
1426 void *internal_start_thread(void (*func)(void *), void *arg) { return 0; }
1428 void internal_join_thread(void *th) {}
1431 #if defined(__aarch64__)
1432 // Android headers in the older NDK releases miss this definition.
1433 struct __sanitizer_esr_context {
1434 struct _aarch64_ctx head;
1438 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) {
1439 static const u32 kEsrMagic = 0x45535201;
1440 u8 *aux = ucontext->uc_mcontext.__reserved;
1442 _aarch64_ctx *ctx = (_aarch64_ctx *)aux;
1443 if (ctx->size == 0) break;
1444 if (ctx->magic == kEsrMagic) {
1445 *esr = ((__sanitizer_esr_context *)ctx)->esr;
1454 SignalContext::WriteFlag SignalContext::GetWriteFlag(void *context) {
1455 ucontext_t *ucontext = (ucontext_t *)context;
1456 #if defined(__x86_64__) || defined(__i386__)
1457 static const uptr PF_WRITE = 1U << 1;
1458 #if SANITIZER_FREEBSD
1459 uptr err = ucontext->uc_mcontext.mc_err;
1461 uptr err = ucontext->uc_mcontext.gregs[REG_ERR];
1463 return err & PF_WRITE ? WRITE : READ;
1464 #elif defined(__arm__)
1465 static const uptr FSR_WRITE = 1U << 11;
1466 uptr fsr = ucontext->uc_mcontext.error_code;
1467 return fsr & FSR_WRITE ? WRITE : READ;
1468 #elif defined(__aarch64__)
1469 static const u64 ESR_ELx_WNR = 1U << 6;
1471 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN;
1472 return esr & ESR_ELx_WNR ? WRITE : READ;
1475 return UNKNOWN; // FIXME: Implement.
1479 void SignalContext::DumpAllRegisters(void *context) {
1480 // FIXME: Implement this.
1483 void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
1484 #if defined(__arm__)
1485 ucontext_t *ucontext = (ucontext_t*)context;
1486 *pc = ucontext->uc_mcontext.arm_pc;
1487 *bp = ucontext->uc_mcontext.arm_fp;
1488 *sp = ucontext->uc_mcontext.arm_sp;
1489 #elif defined(__aarch64__)
1490 ucontext_t *ucontext = (ucontext_t*)context;
1491 *pc = ucontext->uc_mcontext.pc;
1492 *bp = ucontext->uc_mcontext.regs[29];
1493 *sp = ucontext->uc_mcontext.sp;
1494 #elif defined(__hppa__)
1495 ucontext_t *ucontext = (ucontext_t*)context;
1496 *pc = ucontext->uc_mcontext.sc_iaoq[0];
1497 /* GCC uses %r3 whenever a frame pointer is needed. */
1498 *bp = ucontext->uc_mcontext.sc_gr[3];
1499 *sp = ucontext->uc_mcontext.sc_gr[30];
1500 #elif defined(__x86_64__)
1501 # if SANITIZER_FREEBSD
1502 ucontext_t *ucontext = (ucontext_t*)context;
1503 *pc = ucontext->uc_mcontext.mc_rip;
1504 *bp = ucontext->uc_mcontext.mc_rbp;
1505 *sp = ucontext->uc_mcontext.mc_rsp;
1507 ucontext_t *ucontext = (ucontext_t*)context;
1508 *pc = ucontext->uc_mcontext.gregs[REG_RIP];
1509 *bp = ucontext->uc_mcontext.gregs[REG_RBP];
1510 *sp = ucontext->uc_mcontext.gregs[REG_RSP];
1512 #elif defined(__i386__)
1513 # if SANITIZER_FREEBSD
1514 ucontext_t *ucontext = (ucontext_t*)context;
1515 *pc = ucontext->uc_mcontext.mc_eip;
1516 *bp = ucontext->uc_mcontext.mc_ebp;
1517 *sp = ucontext->uc_mcontext.mc_esp;
1519 ucontext_t *ucontext = (ucontext_t*)context;
1520 *pc = ucontext->uc_mcontext.gregs[REG_EIP];
1521 *bp = ucontext->uc_mcontext.gregs[REG_EBP];
1522 *sp = ucontext->uc_mcontext.gregs[REG_ESP];
1524 #elif defined(__powerpc__) || defined(__powerpc64__)
1525 ucontext_t *ucontext = (ucontext_t*)context;
1526 *pc = ucontext->uc_mcontext.regs->nip;
1527 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1];
1528 // The powerpc{,64}-linux ABIs do not specify r31 as the frame
1529 // pointer, but GCC always uses r31 when we need a frame pointer.
1530 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31];
1531 #elif defined(__sparc__)
1532 ucontext_t *ucontext = (ucontext_t*)context;
1534 # if defined (__arch64__)
1535 *pc = ucontext->uc_mcontext.mc_gregs[MC_PC];
1536 *sp = ucontext->uc_mcontext.mc_gregs[MC_O6];
1537 stk_ptr = (uptr *) (*sp + 2047);
1540 *pc = ucontext->uc_mcontext.gregs[REG_PC];
1541 *sp = ucontext->uc_mcontext.gregs[REG_O6];
1542 stk_ptr = (uptr *) *sp;
1545 #elif defined(__mips__)
1546 ucontext_t *ucontext = (ucontext_t*)context;
1547 *pc = ucontext->uc_mcontext.pc;
1548 *bp = ucontext->uc_mcontext.gregs[30];
1549 *sp = ucontext->uc_mcontext.gregs[29];
1550 #elif defined(__s390__)
1551 ucontext_t *ucontext = (ucontext_t*)context;
1552 # if defined(__s390x__)
1553 *pc = ucontext->uc_mcontext.psw.addr;
1555 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff;
1557 *bp = ucontext->uc_mcontext.gregs[11];
1558 *sp = ucontext->uc_mcontext.gregs[15];
1560 # error "Unsupported arch"
1564 void MaybeReexec() {
1565 // No need to re-exec on Linux.
1568 void PrintModuleMap() { }
1570 void CheckNoDeepBind(const char *filename, int flag) {
1571 #ifdef RTLD_DEEPBIND
1572 if (flag & RTLD_DEEPBIND) {
1574 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag"
1575 " which is incompatibe with sanitizer runtime "
1576 "(see https://github.com/google/sanitizers/issues/611 for details"
1577 "). If you want to run %s library under sanitizers please remove "
1578 "RTLD_DEEPBIND from dlopen flags.\n",
1579 filename, filename);
1585 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding) {
1586 UNREACHABLE("FindAvailableMemoryRange is not available");
1590 } // namespace __sanitizer
1592 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX