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 <vm/vm_param.h>
67 #include <machine/atomic.h>
69 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on
70 // FreeBSD 9.2 and 10.0.
73 extern char **environ; // provided by crt1
74 #endif // SANITIZER_FREEBSD
76 #if !SANITIZER_ANDROID
77 #include <sys/signal.h>
80 #ifndef __GLIBC_PREREQ
81 #define __GLIBC_PREREQ(x, y) 0
84 #if SANITIZER_LINUX && __GLIBC_PREREQ(2, 16)
85 # define SANITIZER_USE_GETAUXVAL 1
87 # define SANITIZER_USE_GETAUXVAL 0
90 #if SANITIZER_USE_GETAUXVAL
96 struct kernel_timeval {
101 // <linux/futex.h> is broken on some linux distributions.
102 const int FUTEX_WAIT = 0;
103 const int FUTEX_WAKE = 1;
104 #endif // SANITIZER_LINUX
106 // Are we using 32-bit or 64-bit Linux syscalls?
107 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32
108 // but it still needs to use 64-bit syscalls.
109 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \
110 SANITIZER_WORDSIZE == 64)
111 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1
113 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0
116 #if defined(__x86_64__) || SANITIZER_MIPS64
118 extern void internal_sigreturn();
122 namespace __sanitizer {
124 #if SANITIZER_LINUX && defined(__x86_64__)
125 #include "sanitizer_syscall_linux_x86_64.inc"
126 #elif SANITIZER_LINUX && defined(__aarch64__)
127 #include "sanitizer_syscall_linux_aarch64.inc"
129 #include "sanitizer_syscall_generic.inc"
132 // --------------- sanitizer_libc.h
134 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
136 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
137 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd,
140 // mmap2 specifies file offset in 4096-byte units.
141 CHECK(IsAligned(offset, 4096));
142 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd,
146 #endif // !SANITIZER_S390
148 uptr internal_munmap(void *addr, uptr length) {
149 return internal_syscall(SYSCALL(munmap), (uptr)addr, length);
152 int internal_mprotect(void *addr, uptr length, int prot) {
153 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot);
156 uptr internal_close(fd_t fd) {
157 return internal_syscall(SYSCALL(close), fd);
160 uptr internal_open(const char *filename, int flags) {
161 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
162 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags);
164 return internal_syscall(SYSCALL(open), (uptr)filename, flags);
168 uptr internal_open(const char *filename, int flags, u32 mode) {
169 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
170 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags,
173 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode);
177 uptr internal_read(fd_t fd, void *buf, uptr count) {
179 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf,
184 uptr internal_write(fd_t fd, const void *buf, uptr count) {
186 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf,
191 uptr internal_ftruncate(fd_t fd, uptr size) {
193 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd,
198 #if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && !SANITIZER_FREEBSD
199 static void stat64_to_stat(struct stat64 *in, struct stat *out) {
200 internal_memset(out, 0, sizeof(*out));
201 out->st_dev = in->st_dev;
202 out->st_ino = in->st_ino;
203 out->st_mode = in->st_mode;
204 out->st_nlink = in->st_nlink;
205 out->st_uid = in->st_uid;
206 out->st_gid = in->st_gid;
207 out->st_rdev = in->st_rdev;
208 out->st_size = in->st_size;
209 out->st_blksize = in->st_blksize;
210 out->st_blocks = in->st_blocks;
211 out->st_atime = in->st_atime;
212 out->st_mtime = in->st_mtime;
213 out->st_ctime = in->st_ctime;
214 out->st_ino = in->st_ino;
218 #if defined(__mips64)
219 static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) {
220 internal_memset(out, 0, sizeof(*out));
221 out->st_dev = in->st_dev;
222 out->st_ino = in->st_ino;
223 out->st_mode = in->st_mode;
224 out->st_nlink = in->st_nlink;
225 out->st_uid = in->st_uid;
226 out->st_gid = in->st_gid;
227 out->st_rdev = in->st_rdev;
228 out->st_size = in->st_size;
229 out->st_blksize = in->st_blksize;
230 out->st_blocks = in->st_blocks;
231 out->st_atime = in->st_atime_nsec;
232 out->st_mtime = in->st_mtime_nsec;
233 out->st_ctime = in->st_ctime_nsec;
234 out->st_ino = in->st_ino;
238 uptr internal_stat(const char *path, void *buf) {
239 #if SANITIZER_FREEBSD
240 return internal_syscall(SYSCALL(stat), path, buf);
241 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
242 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path,
244 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
245 # if defined(__mips64)
246 // For mips64, stat syscall fills buffer in the format of kernel_stat
247 struct kernel_stat kbuf;
248 int res = internal_syscall(SYSCALL(stat), path, &kbuf);
249 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
252 return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf);
256 int res = internal_syscall(SYSCALL(stat64), path, &buf64);
257 stat64_to_stat(&buf64, (struct stat *)buf);
262 uptr internal_lstat(const char *path, void *buf) {
263 #if SANITIZER_FREEBSD
264 return internal_syscall(SYSCALL(lstat), path, buf);
265 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
266 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path,
267 (uptr)buf, AT_SYMLINK_NOFOLLOW);
268 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
269 # if SANITIZER_MIPS64
270 // For mips64, lstat syscall fills buffer in the format of kernel_stat
271 struct kernel_stat kbuf;
272 int res = internal_syscall(SYSCALL(lstat), path, &kbuf);
273 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
276 return internal_syscall(SYSCALL(lstat), (uptr)path, (uptr)buf);
280 int res = internal_syscall(SYSCALL(lstat64), path, &buf64);
281 stat64_to_stat(&buf64, (struct stat *)buf);
286 uptr internal_fstat(fd_t fd, void *buf) {
287 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
288 # if SANITIZER_MIPS64
289 // For mips64, fstat syscall fills buffer in the format of kernel_stat
290 struct kernel_stat kbuf;
291 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf);
292 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
295 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf);
299 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64);
300 stat64_to_stat(&buf64, (struct stat *)buf);
305 uptr internal_filesize(fd_t fd) {
307 if (internal_fstat(fd, &st))
309 return (uptr)st.st_size;
312 uptr internal_dup2(int oldfd, int newfd) {
313 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
314 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0);
316 return internal_syscall(SYSCALL(dup2), oldfd, newfd);
320 uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
321 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
322 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD,
323 (uptr)path, (uptr)buf, bufsize);
325 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize);
329 uptr internal_unlink(const char *path) {
330 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
331 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0);
333 return internal_syscall(SYSCALL(unlink), (uptr)path);
337 uptr internal_rename(const char *oldpath, const char *newpath) {
338 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
339 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD,
342 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath);
346 uptr internal_sched_yield() {
347 return internal_syscall(SYSCALL(sched_yield));
350 void internal__exit(int exitcode) {
351 #if SANITIZER_FREEBSD
352 internal_syscall(SYSCALL(exit), exitcode);
354 internal_syscall(SYSCALL(exit_group), exitcode);
356 Die(); // Unreachable.
359 unsigned int internal_sleep(unsigned int seconds) {
363 int res = internal_syscall(SYSCALL(nanosleep), &ts, &ts);
364 if (res) return ts.tv_sec;
368 uptr internal_execve(const char *filename, char *const argv[],
369 char *const envp[]) {
370 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv,
374 // ----------------- sanitizer_common.h
375 bool FileExists(const char *filename) {
377 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
378 if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0))
380 if (internal_stat(filename, &st))
383 // Sanity check: filename is a regular file.
384 return S_ISREG(st.st_mode);
388 #if SANITIZER_FREEBSD
389 return (uptr)pthread_self();
391 return internal_syscall(SYSCALL(gettid));
396 #if SANITIZER_FREEBSD
401 internal_memset(&tv, 0, sizeof(tv));
402 internal_syscall(SYSCALL(gettimeofday), (uptr)&tv, 0);
403 return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000;
406 // Like getenv, but reads env directly from /proc (on Linux) or parses the
407 // 'environ' array (on FreeBSD) and does not use libc. This function should be
408 // called first inside __asan_init.
409 const char *GetEnv(const char *name) {
410 #if SANITIZER_FREEBSD
411 if (::environ != 0) {
412 uptr NameLen = internal_strlen(name);
413 for (char **Env = ::environ; *Env != 0; Env++) {
414 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
415 return (*Env) + NameLen + 1;
418 return 0; // Not found.
419 #elif SANITIZER_LINUX
420 static char *environ;
426 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len))
429 if (!environ || len == 0) return nullptr;
430 uptr namelen = internal_strlen(name);
431 const char *p = environ;
432 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer
433 // proc file has the format NAME=value\0NAME=value\0NAME=value\0...
435 (char*)internal_memchr(p, '\0', len - (p - environ));
436 if (!endp) // this entry isn't NUL terminated
438 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match.
439 return p + namelen + 1; // point after =
442 return nullptr; // Not found.
444 #error "Unsupported platform"
448 #if !SANITIZER_FREEBSD
450 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end;
454 #if !SANITIZER_GO && !SANITIZER_FREEBSD
455 static void ReadNullSepFileToArray(const char *path, char ***arr,
460 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray");
461 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) {
467 for (count = 1, i = 1; ; i++) {
469 if (buff[i+1] == 0) break;
470 (*arr)[count] = &buff[i+1];
471 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible.
475 (*arr)[count] = nullptr;
479 static void GetArgsAndEnv(char ***argv, char ***envp) {
480 #if !SANITIZER_FREEBSD
482 if (&__libc_stack_end) {
484 uptr* stack_end = (uptr*)__libc_stack_end;
485 int argc = *stack_end;
486 *argv = (char**)(stack_end + 1);
487 *envp = (char**)(stack_end + argc + 2);
490 static const int kMaxArgv = 2000, kMaxEnvp = 2000;
491 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv);
492 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp);
496 // On FreeBSD, retrieving the argument and environment arrays is done via the
497 // kern.ps_strings sysctl, which returns a pointer to a structure containing
498 // this information. See also <sys/exec.h>.
500 size_t sz = sizeof(pss);
501 if (sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) {
502 Printf("sysctl kern.ps_strings failed\n");
505 *argv = pss->ps_argvstr;
506 *envp = pss->ps_envstr;
512 GetArgsAndEnv(&argv, &envp);
518 GetArgsAndEnv(&argv, &envp);
519 uptr rv = internal_execve("/proc/self/exe", argv, envp);
521 CHECK_EQ(internal_iserror(rv, &rverrno), true);
522 Printf("execve failed, errno %d\n", rverrno);
532 BlockingMutex::BlockingMutex() {
533 internal_memset(this, 0, sizeof(*this));
536 void BlockingMutex::Lock() {
538 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
539 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
541 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) {
542 #if SANITIZER_FREEBSD
543 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0);
545 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT, MtxSleeping, 0, 0, 0);
550 void BlockingMutex::Unlock() {
551 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
552 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_relaxed);
553 CHECK_NE(v, MtxUnlocked);
554 if (v == MtxSleeping) {
555 #if SANITIZER_FREEBSD
556 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0);
558 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE, 1, 0, 0, 0);
563 void BlockingMutex::CheckLocked() {
564 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
565 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed));
568 // ----------------- sanitizer_linux.h
569 // The actual size of this structure is specified by d_reclen.
570 // Note that getdents64 uses a different structure format. We only provide the
571 // 32-bit syscall here.
572 struct linux_dirent {
573 #if SANITIZER_X32 || defined(__aarch64__)
580 unsigned short d_reclen;
582 unsigned char d_type;
588 uptr internal_ptrace(int request, int pid, void *addr, void *data) {
589 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr,
593 uptr internal_waitpid(int pid, int *status, int options) {
594 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options,
598 uptr internal_getpid() {
599 return internal_syscall(SYSCALL(getpid));
602 uptr internal_getppid() {
603 return internal_syscall(SYSCALL(getppid));
606 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) {
607 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
608 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count);
610 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count);
614 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) {
615 return internal_syscall(SYSCALL(lseek), fd, offset, whence);
619 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) {
620 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5);
624 uptr internal_sigaltstack(const struct sigaltstack *ss,
625 struct sigaltstack *oss) {
626 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss);
629 int internal_fork() {
630 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
631 return internal_syscall(SYSCALL(clone), SIGCHLD, 0);
633 return internal_syscall(SYSCALL(fork));
638 #define SA_RESTORER 0x04000000
639 // Doesn't set sa_restorer if the caller did not set it, so use with caution
641 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) {
642 __sanitizer_kernel_sigaction_t k_act, k_oldact;
643 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t));
644 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t));
645 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act;
646 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact;
648 k_act.handler = u_act->handler;
649 k_act.sigaction = u_act->sigaction;
650 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask,
651 sizeof(__sanitizer_kernel_sigset_t));
652 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL).
653 k_act.sa_flags = u_act->sa_flags | SA_RESTORER;
654 // FIXME: most often sa_restorer is unset, however the kernel requires it
655 // to point to a valid signal restorer that calls the rt_sigreturn syscall.
656 // If sa_restorer passed to the kernel is NULL, the program may crash upon
657 // signal delivery or fail to unwind the stack in the signal handler.
658 // libc implementation of sigaction() passes its own restorer to
659 // rt_sigaction, so we need to do the same (we'll need to reimplement the
660 // restorers; for x86_64 the restorer address can be obtained from
661 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact).
662 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
663 k_act.sa_restorer = u_act->sa_restorer;
667 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum,
668 (uptr)(u_act ? &k_act : nullptr),
669 (uptr)(u_oldact ? &k_oldact : nullptr),
670 (uptr)sizeof(__sanitizer_kernel_sigset_t));
672 if ((result == 0) && u_oldact) {
673 u_oldact->handler = k_oldact.handler;
674 u_oldact->sigaction = k_oldact.sigaction;
675 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask,
676 sizeof(__sanitizer_kernel_sigset_t));
677 u_oldact->sa_flags = k_oldact.sa_flags;
678 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
679 u_oldact->sa_restorer = k_oldact.sa_restorer;
685 // Invokes sigaction via a raw syscall with a restorer, but does not support
686 // all platforms yet.
687 // We disable for Go simply because we have not yet added to buildgo.sh.
688 #if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
689 int internal_sigaction_syscall(int signum, const void *act, void *oldact) {
691 return internal_sigaction_norestorer(signum, act, oldact);
692 __sanitizer_sigaction u_adjust;
693 internal_memcpy(&u_adjust, act, sizeof(u_adjust));
694 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
695 if (u_adjust.sa_restorer == nullptr) {
696 u_adjust.sa_restorer = internal_sigreturn;
699 return internal_sigaction_norestorer(signum, (const void *)&u_adjust,
702 #endif // defined(__x86_64__) && !SANITIZER_GO
703 #endif // SANITIZER_LINUX
705 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
706 __sanitizer_sigset_t *oldset) {
707 #if SANITIZER_FREEBSD
708 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset);
710 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
711 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset;
712 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how,
713 (uptr)&k_set->sig[0], (uptr)&k_oldset->sig[0],
714 sizeof(__sanitizer_kernel_sigset_t));
718 void internal_sigfillset(__sanitizer_sigset_t *set) {
719 internal_memset(set, 0xff, sizeof(*set));
722 void internal_sigemptyset(__sanitizer_sigset_t *set) {
723 internal_memset(set, 0, sizeof(*set));
727 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
730 CHECK_LT(signum, sizeof(*set) * 8);
731 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
732 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
733 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
734 k_set->sig[idx] &= ~(1 << bit);
737 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
740 CHECK_LT(signum, sizeof(*set) * 8);
741 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
742 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
743 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
744 return k_set->sig[idx] & (1 << bit);
746 #endif // SANITIZER_LINUX
748 // ThreadLister implementation.
749 ThreadLister::ThreadLister(int pid)
754 entry_((struct linux_dirent *)buffer_.data()),
756 char task_directory_path[80];
757 internal_snprintf(task_directory_path, sizeof(task_directory_path),
758 "/proc/%d/task/", pid);
759 uptr openrv = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY);
760 if (internal_iserror(openrv)) {
762 Report("Can't open /proc/%d/task for reading.\n", pid);
765 descriptor_ = openrv;
769 int ThreadLister::GetNextTID() {
774 if ((char *)entry_ >= &buffer_[bytes_read_] && !GetDirectoryEntries())
776 if (entry_->d_ino != 0 && entry_->d_name[0] >= '0' &&
777 entry_->d_name[0] <= '9') {
778 // Found a valid tid.
779 tid = (int)internal_atoll(entry_->d_name);
781 entry_ = (struct linux_dirent *)(((char *)entry_) + entry_->d_reclen);
786 void ThreadLister::Reset() {
787 if (error_ || descriptor_ < 0)
789 internal_lseek(descriptor_, 0, SEEK_SET);
792 ThreadLister::~ThreadLister() {
793 if (descriptor_ >= 0)
794 internal_close(descriptor_);
797 bool ThreadLister::error() { return error_; }
799 bool ThreadLister::GetDirectoryEntries() {
800 CHECK_GE(descriptor_, 0);
801 CHECK_NE(error_, true);
802 bytes_read_ = internal_getdents(descriptor_,
803 (struct linux_dirent *)buffer_.data(),
805 if (internal_iserror(bytes_read_)) {
806 Report("Can't read directory entries from /proc/%d/task.\n", pid_);
809 } else if (bytes_read_ == 0) {
812 entry_ = (struct linux_dirent *)buffer_.data();
817 // Android post-M sysconf(_SC_PAGESIZE) crashes if called from .preinit_array.
818 #if SANITIZER_ANDROID
820 #elif SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__))
821 return EXEC_PAGESIZE;
822 #elif SANITIZER_USE_GETAUXVAL
823 return getauxval(AT_PAGESZ);
825 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy.
829 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
830 #if SANITIZER_FREEBSD
831 const int Mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
832 const char *default_module_name = "kern.proc.pathname";
833 size_t Size = buf_len;
834 bool IsErr = (sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0);
835 int readlink_error = IsErr ? errno : 0;
836 uptr module_name_len = Size;
838 const char *default_module_name = "/proc/self/exe";
839 uptr module_name_len = internal_readlink(
840 default_module_name, buf, buf_len);
842 bool IsErr = internal_iserror(module_name_len, &readlink_error);
845 // We can't read binary name for some reason, assume it's unknown.
846 Report("WARNING: reading executable name failed with errno %d, "
847 "some stack frames may not be symbolized\n", readlink_error);
848 module_name_len = internal_snprintf(buf, buf_len, "%s",
849 default_module_name);
850 CHECK_LT(module_name_len, buf_len);
852 return module_name_len;
855 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
860 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen,
862 internal_strncpy(buf, tmpbuf, buf_len);
863 UnmapOrDie(tmpbuf, tmpsize);
864 return internal_strlen(buf);
867 return ReadBinaryName(buf, buf_len);
870 // Match full names of the form /path/to/base_name{-,.}*
871 bool LibraryNameIs(const char *full_name, const char *base_name) {
872 const char *name = full_name;
874 while (*name != '\0') name++;
875 while (name > full_name && *name != '/') name--;
876 if (*name == '/') name++;
877 uptr base_name_length = internal_strlen(base_name);
878 if (internal_strncmp(name, base_name, base_name_length)) return false;
879 return (name[base_name_length] == '-' || name[base_name_length] == '.');
882 #if !SANITIZER_ANDROID
883 // Call cb for each region mapped by map.
884 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) {
885 CHECK_NE(map, nullptr);
886 #if !SANITIZER_FREEBSD
887 typedef ElfW(Phdr) Elf_Phdr;
888 typedef ElfW(Ehdr) Elf_Ehdr;
889 #endif // !SANITIZER_FREEBSD
890 char *base = (char *)map->l_addr;
891 Elf_Ehdr *ehdr = (Elf_Ehdr *)base;
892 char *phdrs = base + ehdr->e_phoff;
893 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize;
895 // Find the segment with the minimum base so we can "relocate" the p_vaddr
896 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC
897 // objects have a non-zero base.
898 uptr preferred_base = (uptr)-1;
899 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
900 Elf_Phdr *phdr = (Elf_Phdr *)iter;
901 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr)
902 preferred_base = (uptr)phdr->p_vaddr;
905 // Compute the delta from the real base to get a relocation delta.
906 sptr delta = (uptr)base - preferred_base;
907 // Now we can figure out what the loader really mapped.
908 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
909 Elf_Phdr *phdr = (Elf_Phdr *)iter;
910 if (phdr->p_type == PT_LOAD) {
911 uptr seg_start = phdr->p_vaddr + delta;
912 uptr seg_end = seg_start + phdr->p_memsz;
913 // None of these values are aligned. We consider the ragged edges of the
914 // load command as defined, since they are mapped from the file.
915 seg_start = RoundDownTo(seg_start, GetPageSizeCached());
916 seg_end = RoundUpTo(seg_end, GetPageSizeCached());
917 cb((void *)seg_start, seg_end - seg_start);
923 #if defined(__x86_64__) && SANITIZER_LINUX
924 // We cannot use glibc's clone wrapper, because it messes with the child
925 // task's TLS. It writes the PID and TID of the child task to its thread
926 // descriptor, but in our case the child task shares the thread descriptor with
927 // the parent (because we don't know how to allocate a new thread
928 // descriptor to keep glibc happy). So the stock version of clone(), when
929 // used with CLONE_VM, would end up corrupting the parent's thread descriptor.
930 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
931 int *parent_tidptr, void *newtls, int *child_tidptr) {
933 if (!fn || !child_stack)
935 CHECK_EQ(0, (uptr)child_stack % 16);
936 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
937 ((unsigned long long *)child_stack)[0] = (uptr)fn;
938 ((unsigned long long *)child_stack)[1] = (uptr)arg;
939 register void *r8 __asm__("r8") = newtls;
940 register int *r10 __asm__("r10") = child_tidptr;
941 __asm__ __volatile__(
942 /* %rax = syscall(%rax = SYSCALL(clone),
944 * %rsi = child_stack,
945 * %rdx = parent_tidptr,
947 * %r10 = child_tidptr)
954 "testq %%rax,%%rax\n"
957 /* In the child. Terminate unwind chain. */
958 // XXX: We should also terminate the CFI unwind chain
959 // here. Unfortunately clang 3.2 doesn't support the
960 // necessary CFI directives, so we skip that part.
963 /* Call "fn(arg)". */
968 /* Call _exit(%rax). */
973 /* Return to parent. */
976 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)),
982 : "rsp", "memory", "r11", "rcx");
985 #elif defined(__mips__)
986 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
987 int *parent_tidptr, void *newtls, int *child_tidptr) {
989 if (!fn || !child_stack)
991 CHECK_EQ(0, (uptr)child_stack % 16);
992 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
993 ((unsigned long long *)child_stack)[0] = (uptr)fn;
994 ((unsigned long long *)child_stack)[1] = (uptr)arg;
995 register void *a3 __asm__("$7") = newtls;
996 register int *a4 __asm__("$8") = child_tidptr;
997 // We don't have proper CFI directives here because it requires alot of code
998 // for very marginal benefits.
999 __asm__ __volatile__(
1000 /* $v0 = syscall($v0 = __NR_clone,
1002 * $a1 = child_stack,
1003 * $a2 = parent_tidptr,
1005 * $a4 = child_tidptr)
1012 /* Store the fifth argument on stack
1013 * if we are using 32-bit abi.
1015 #if SANITIZER_WORDSIZE == 32
1028 /* Call "fn(arg)". */
1029 #if SANITIZER_WORDSIZE == 32
1030 #ifdef __BIG_ENDIAN__
1043 /* Call _exit($v0). */
1048 /* Return to parent. */
1058 : "memory", "$29" );
1061 #elif defined(__aarch64__)
1062 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1063 int *parent_tidptr, void *newtls, int *child_tidptr) {
1065 if (!fn || !child_stack)
1067 CHECK_EQ(0, (uptr)child_stack % 16);
1068 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1069 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1070 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1072 register int (*__fn)(void *) __asm__("x0") = fn;
1073 register void *__stack __asm__("x1") = child_stack;
1074 register int __flags __asm__("x2") = flags;
1075 register void *__arg __asm__("x3") = arg;
1076 register int *__ptid __asm__("x4") = parent_tidptr;
1077 register void *__tls __asm__("x5") = newtls;
1078 register int *__ctid __asm__("x6") = child_tidptr;
1080 __asm__ __volatile__(
1081 "mov x0,x2\n" /* flags */
1082 "mov x2,x4\n" /* ptid */
1083 "mov x3,x5\n" /* tls */
1084 "mov x4,x6\n" /* ctid */
1085 "mov x8,%9\n" /* clone */
1095 /* In the child, now. Call "fn(arg)". */
1096 "ldp x1, x0, [sp], #16\n"
1099 /* Call _exit(%r0). */
1106 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg),
1107 "r"(__ptid), "r"(__tls), "r"(__ctid),
1108 "i"(__NR_clone), "i"(__NR_exit)
1112 #elif defined(__powerpc64__)
1113 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1114 int *parent_tidptr, void *newtls, int *child_tidptr) {
1116 // Stack frame structure.
1117 #if SANITIZER_PPC64V1
1118 // Back chain == 0 (SP + 112)
1119 // Frame (112 bytes):
1120 // Parameter save area (SP + 48), 8 doublewords
1121 // TOC save area (SP + 40)
1122 // Link editor doubleword (SP + 32)
1123 // Compiler doubleword (SP + 24)
1124 // LR save area (SP + 16)
1125 // CR save area (SP + 8)
1126 // Back chain (SP + 0)
1127 # define FRAME_SIZE 112
1128 # define FRAME_TOC_SAVE_OFFSET 40
1129 #elif SANITIZER_PPC64V2
1130 // Back chain == 0 (SP + 32)
1131 // Frame (32 bytes):
1132 // TOC save area (SP + 24)
1133 // LR save area (SP + 16)
1134 // CR save area (SP + 8)
1135 // Back chain (SP + 0)
1136 # define FRAME_SIZE 32
1137 # define FRAME_TOC_SAVE_OFFSET 24
1139 # error "Unsupported PPC64 ABI"
1141 if (!fn || !child_stack)
1143 CHECK_EQ(0, (uptr)child_stack % 16);
1145 register int (*__fn)(void *) __asm__("r3") = fn;
1146 register void *__cstack __asm__("r4") = child_stack;
1147 register int __flags __asm__("r5") = flags;
1148 register void *__arg __asm__("r6") = arg;
1149 register int *__ptidptr __asm__("r7") = parent_tidptr;
1150 register void *__newtls __asm__("r8") = newtls;
1151 register int *__ctidptr __asm__("r9") = child_tidptr;
1153 __asm__ __volatile__(
1154 /* fn and arg are saved across the syscall */
1164 r7 == child_tidptr */
1172 /* Test if syscall was successful */
1173 "cmpdi cr1, 3, 0\n\t"
1174 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t"
1177 /* Set up stack frame */
1179 "stdu 29, -8(1)\n\t"
1180 "stdu 1, -%12(1)\n\t"
1181 /* Do the function call */
1183 #if SANITIZER_PPC64V1
1187 #elif SANITIZER_PPC64V2
1191 # error "Unsupported PPC64 ABI"
1197 /* Call _exit(r3) */
1201 /* Return to parent */
1217 "i" (FRAME_TOC_SAVE_OFFSET)
1218 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29");
1221 #elif defined(__i386__) && SANITIZER_LINUX
1222 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1223 int *parent_tidptr, void *newtls, int *child_tidptr) {
1225 if (!fn || !child_stack)
1227 CHECK_EQ(0, (uptr)child_stack % 16);
1228 child_stack = (char *)child_stack - 7 * sizeof(unsigned int);
1229 ((unsigned int *)child_stack)[0] = (uptr)flags;
1230 ((unsigned int *)child_stack)[1] = (uptr)0;
1231 ((unsigned int *)child_stack)[2] = (uptr)fn;
1232 ((unsigned int *)child_stack)[3] = (uptr)arg;
1233 __asm__ __volatile__(
1234 /* %eax = syscall(%eax = SYSCALL(clone),
1236 * %ecx = child_stack,
1237 * %edx = parent_tidptr,
1239 * %edi = child_tidptr)
1243 "movl (%%ecx), %%ebx\n"
1244 /* Do the system call */
1248 /* Remember the flag value. */
1249 "movl %%ebx, (%%ecx)\n"
1259 "test %%eax,%%eax\n"
1262 /* terminate the stack frame */
1263 "xorl %%ebp,%%ebp\n"
1270 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n"
1273 "movl %%eax, %%ebx\n"
1278 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)),
1286 #elif defined(__arm__) && SANITIZER_LINUX
1287 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1288 int *parent_tidptr, void *newtls, int *child_tidptr) {
1290 if (!fn || !child_stack)
1292 child_stack = (char *)child_stack - 2 * sizeof(unsigned int);
1293 ((unsigned int *)child_stack)[0] = (uptr)fn;
1294 ((unsigned int *)child_stack)[1] = (uptr)arg;
1295 register int r0 __asm__("r0") = flags;
1296 register void *r1 __asm__("r1") = child_stack;
1297 register int *r2 __asm__("r2") = parent_tidptr;
1298 register void *r3 __asm__("r3") = newtls;
1299 register int *r4 __asm__("r4") = child_tidptr;
1300 register int r7 __asm__("r7") = __NR_clone;
1302 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__)
1303 # define ARCH_HAS_BX
1306 # define ARCH_HAS_BLX
1310 # ifdef ARCH_HAS_BLX
1311 # define BLX(R) "blx " #R "\n"
1313 # define BLX(R) "mov lr, pc; bx " #R "\n"
1316 # define BLX(R) "mov lr, pc; mov pc," #R "\n"
1319 __asm__ __volatile__(
1320 /* %r0 = syscall(%r7 = SYSCALL(clone),
1322 * %r1 = child_stack,
1323 * %r2 = parent_tidptr,
1325 * %r4 = child_tidptr)
1328 /* Do the system call */
1337 /* In the child, now. Call "fn(arg)". */
1338 "ldr r0, [sp, #4]\n"
1339 "ldr ip, [sp], #8\n"
1341 /* Call _exit(%r0). */
1347 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7),
1352 #endif // defined(__x86_64__) && SANITIZER_LINUX
1354 #if SANITIZER_ANDROID
1355 #if __ANDROID_API__ < 21
1356 extern "C" __attribute__((weak)) int dl_iterate_phdr(
1357 int (*)(struct dl_phdr_info *, size_t, void *), void *);
1360 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size,
1362 // Any name starting with "lib" indicates a bug in L where library base names
1363 // are returned instead of paths.
1364 if (info->dlpi_name && info->dlpi_name[0] == 'l' &&
1365 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') {
1366 *(bool *)data = true;
1372 static atomic_uint32_t android_api_level;
1374 static AndroidApiLevel AndroidDetectApiLevel() {
1375 if (!&dl_iterate_phdr)
1376 return ANDROID_KITKAT; // K or lower
1377 bool base_name_seen = false;
1378 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen);
1380 return ANDROID_LOLLIPOP_MR1; // L MR1
1381 return ANDROID_POST_LOLLIPOP; // post-L
1382 // Plain L (API level 21) is completely broken wrt ASan and not very
1383 // interesting to detect.
1386 AndroidApiLevel AndroidGetApiLevel() {
1387 AndroidApiLevel level =
1388 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed);
1389 if (level) return level;
1390 level = AndroidDetectApiLevel();
1391 atomic_store(&android_api_level, level, memory_order_relaxed);
1397 bool IsHandledDeadlySignal(int signum) {
1398 if (common_flags()->handle_abort && signum == SIGABRT)
1400 if (common_flags()->handle_sigill && signum == SIGILL)
1402 if (common_flags()->handle_sigfpe && signum == SIGFPE)
1404 if (common_flags()->handle_segv && signum == SIGSEGV)
1406 return common_flags()->handle_sigbus && signum == SIGBUS;
1410 void *internal_start_thread(void(*func)(void *arg), void *arg) {
1411 // Start the thread with signals blocked, otherwise it can steal user signals.
1412 __sanitizer_sigset_t set, old;
1413 internal_sigfillset(&set);
1414 #if SANITIZER_LINUX && !SANITIZER_ANDROID
1415 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked
1416 // on any thread, setuid call hangs (see test/tsan/setuid.c).
1417 internal_sigdelset(&set, 33);
1419 internal_sigprocmask(SIG_SETMASK, &set, &old);
1421 real_pthread_create(&th, nullptr, (void*(*)(void *arg))func, arg);
1422 internal_sigprocmask(SIG_SETMASK, &old, nullptr);
1426 void internal_join_thread(void *th) {
1427 real_pthread_join(th, nullptr);
1430 void *internal_start_thread(void (*func)(void *), void *arg) { return 0; }
1432 void internal_join_thread(void *th) {}
1435 #if defined(__aarch64__)
1436 // Android headers in the older NDK releases miss this definition.
1437 struct __sanitizer_esr_context {
1438 struct _aarch64_ctx head;
1442 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) {
1443 static const u32 kEsrMagic = 0x45535201;
1444 u8 *aux = ucontext->uc_mcontext.__reserved;
1446 _aarch64_ctx *ctx = (_aarch64_ctx *)aux;
1447 if (ctx->size == 0) break;
1448 if (ctx->magic == kEsrMagic) {
1449 *esr = ((__sanitizer_esr_context *)ctx)->esr;
1458 SignalContext::WriteFlag SignalContext::GetWriteFlag(void *context) {
1459 ucontext_t *ucontext = (ucontext_t *)context;
1460 #if defined(__x86_64__) || defined(__i386__)
1461 static const uptr PF_WRITE = 1U << 1;
1462 #if SANITIZER_FREEBSD
1463 uptr err = ucontext->uc_mcontext.mc_err;
1465 uptr err = ucontext->uc_mcontext.gregs[REG_ERR];
1467 return err & PF_WRITE ? WRITE : READ;
1468 #elif defined(__arm__)
1469 static const uptr FSR_WRITE = 1U << 11;
1470 uptr fsr = ucontext->uc_mcontext.error_code;
1471 return fsr & FSR_WRITE ? WRITE : READ;
1472 #elif defined(__aarch64__)
1473 static const u64 ESR_ELx_WNR = 1U << 6;
1475 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN;
1476 return esr & ESR_ELx_WNR ? WRITE : READ;
1479 return UNKNOWN; // FIXME: Implement.
1483 void SignalContext::DumpAllRegisters(void *context) {
1484 // FIXME: Implement this.
1487 void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
1488 #if defined(__arm__)
1489 ucontext_t *ucontext = (ucontext_t*)context;
1490 *pc = ucontext->uc_mcontext.arm_pc;
1491 *bp = ucontext->uc_mcontext.arm_fp;
1492 *sp = ucontext->uc_mcontext.arm_sp;
1493 #elif defined(__aarch64__)
1494 ucontext_t *ucontext = (ucontext_t*)context;
1495 *pc = ucontext->uc_mcontext.pc;
1496 *bp = ucontext->uc_mcontext.regs[29];
1497 *sp = ucontext->uc_mcontext.sp;
1498 #elif defined(__hppa__)
1499 ucontext_t *ucontext = (ucontext_t*)context;
1500 *pc = ucontext->uc_mcontext.sc_iaoq[0];
1501 /* GCC uses %r3 whenever a frame pointer is needed. */
1502 *bp = ucontext->uc_mcontext.sc_gr[3];
1503 *sp = ucontext->uc_mcontext.sc_gr[30];
1504 #elif defined(__x86_64__)
1505 # if SANITIZER_FREEBSD
1506 ucontext_t *ucontext = (ucontext_t*)context;
1507 *pc = ucontext->uc_mcontext.mc_rip;
1508 *bp = ucontext->uc_mcontext.mc_rbp;
1509 *sp = ucontext->uc_mcontext.mc_rsp;
1511 ucontext_t *ucontext = (ucontext_t*)context;
1512 *pc = ucontext->uc_mcontext.gregs[REG_RIP];
1513 *bp = ucontext->uc_mcontext.gregs[REG_RBP];
1514 *sp = ucontext->uc_mcontext.gregs[REG_RSP];
1516 #elif defined(__i386__)
1517 # if SANITIZER_FREEBSD
1518 ucontext_t *ucontext = (ucontext_t*)context;
1519 *pc = ucontext->uc_mcontext.mc_eip;
1520 *bp = ucontext->uc_mcontext.mc_ebp;
1521 *sp = ucontext->uc_mcontext.mc_esp;
1523 ucontext_t *ucontext = (ucontext_t*)context;
1524 *pc = ucontext->uc_mcontext.gregs[REG_EIP];
1525 *bp = ucontext->uc_mcontext.gregs[REG_EBP];
1526 *sp = ucontext->uc_mcontext.gregs[REG_ESP];
1528 #elif defined(__powerpc__) || defined(__powerpc64__)
1529 ucontext_t *ucontext = (ucontext_t*)context;
1530 *pc = ucontext->uc_mcontext.regs->nip;
1531 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1];
1532 // The powerpc{,64}-linux ABIs do not specify r31 as the frame
1533 // pointer, but GCC always uses r31 when we need a frame pointer.
1534 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31];
1535 #elif defined(__sparc__)
1536 ucontext_t *ucontext = (ucontext_t*)context;
1538 # if defined (__arch64__)
1539 *pc = ucontext->uc_mcontext.mc_gregs[MC_PC];
1540 *sp = ucontext->uc_mcontext.mc_gregs[MC_O6];
1541 stk_ptr = (uptr *) (*sp + 2047);
1544 *pc = ucontext->uc_mcontext.gregs[REG_PC];
1545 *sp = ucontext->uc_mcontext.gregs[REG_O6];
1546 stk_ptr = (uptr *) *sp;
1549 #elif defined(__mips__)
1550 ucontext_t *ucontext = (ucontext_t*)context;
1551 *pc = ucontext->uc_mcontext.pc;
1552 *bp = ucontext->uc_mcontext.gregs[30];
1553 *sp = ucontext->uc_mcontext.gregs[29];
1554 #elif defined(__s390__)
1555 ucontext_t *ucontext = (ucontext_t*)context;
1556 # if defined(__s390x__)
1557 *pc = ucontext->uc_mcontext.psw.addr;
1559 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff;
1561 *bp = ucontext->uc_mcontext.gregs[11];
1562 *sp = ucontext->uc_mcontext.gregs[15];
1564 # error "Unsupported arch"
1568 void MaybeReexec() {
1569 // No need to re-exec on Linux.
1572 void PrintModuleMap() { }
1574 void CheckNoDeepBind(const char *filename, int flag) {
1575 #ifdef RTLD_DEEPBIND
1576 if (flag & RTLD_DEEPBIND) {
1578 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag"
1579 " which is incompatibe with sanitizer runtime "
1580 "(see https://github.com/google/sanitizers/issues/611 for details"
1581 "). If you want to run %s library under sanitizers please remove "
1582 "RTLD_DEEPBIND from dlopen flags.\n",
1583 filename, filename);
1589 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding) {
1590 UNREACHABLE("FindAvailableMemoryRange is not available");
1594 } // namespace __sanitizer
1596 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX