1 //===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===//
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 // Linux-specific syscall wrappers and classes.
12 //===----------------------------------------------------------------------===//
13 #ifndef SANITIZER_LINUX_H
14 #define SANITIZER_LINUX_H
16 #include "sanitizer_platform.h"
17 #if SANITIZER_FREEBSD || SANITIZER_LINUX
18 #include "sanitizer_common.h"
19 #include "sanitizer_internal_defs.h"
20 #include "sanitizer_posix.h"
21 #include "sanitizer_platform_limits_posix.h"
23 struct link_map; // Opaque type returned by dlopen().
26 namespace __sanitizer {
27 // Dirent structure for getdents(). Note that this structure is different from
28 // the one in <dirent.h>, which is used by readdir().
32 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
33 uptr internal_sigaltstack(const struct sigaltstack* ss,
34 struct sigaltstack* oss);
35 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
36 __sanitizer_sigset_t *oldset);
38 // Linux-only syscalls.
40 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5);
41 // Used only by sanitizer_stoptheworld. Signal handlers that are actually used
42 // (like the process-wide error reporting SEGV handler) must use
43 // internal_sigaction instead.
44 int internal_sigaction_norestorer(int signum, const void *act, void *oldact);
45 #if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
46 // Uses a raw system call to avoid interceptors.
47 int internal_sigaction_syscall(int signum, const void *act, void *oldact);
49 void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
50 #if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \
51 || defined(__powerpc64__) || defined(__s390__) || defined(__i386__) \
53 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
54 int *parent_tidptr, void *newtls, int *child_tidptr);
56 #endif // SANITIZER_LINUX
58 // This class reads thread IDs from /proc/<pid>/task using only syscalls.
61 explicit ThreadLister(int pid);
63 // GetNextTID returns -1 if the list of threads is exhausted, or if there has
70 bool GetDirectoryEntries();
74 InternalScopedBuffer<char> buffer_;
76 struct linux_dirent* entry_;
80 // Exposed for testing.
81 uptr ThreadDescriptorSize();
83 uptr ThreadSelfOffset();
85 // Matches a library's file name against a base name (stripping path and version
87 bool LibraryNameIs(const char *full_name, const char *base_name);
89 // Call cb for each region mapped by map.
90 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr));
94 #if defined(__aarch64__)
95 # define __get_tls() \
96 ({ void** __v; __asm__("mrs %0, tpidr_el0" : "=r"(__v)); __v; })
97 #elif defined(__arm__)
98 # define __get_tls() \
99 ({ void** __v; __asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__v)); __v; })
100 #elif defined(__mips__)
101 // On mips32r1, this goes via a kernel illegal instruction trap that's
103 # define __get_tls() \
104 ({ register void** __v asm("v1"); \
105 __asm__(".set push\n" \
108 ".set pop\n" : "=r"(__v)); \
110 #elif defined(__i386__)
111 # define __get_tls() \
112 ({ void** __v; __asm__("movl %%gs:0, %0" : "=r"(__v)); __v; })
113 #elif defined(__x86_64__)
114 # define __get_tls() \
115 ({ void** __v; __asm__("mov %%fs:0, %0" : "=r"(__v)); __v; })
117 #error "Unsupported architecture."
120 // The Android Bionic team has allocated a TLS slot for TSan starting with N,
121 // given that Android currently doesn't support ELF TLS. It is used to store
122 // Sanitizers thread specific data.
123 static const int TLS_SLOT_TSAN = 8;
125 ALWAYS_INLINE uptr *get_android_tls_ptr() {
126 return reinterpret_cast<uptr *>(&__get_tls()[TLS_SLOT_TSAN]);
129 #endif // SANITIZER_ANDROID
131 } // namespace __sanitizer
133 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX
134 #endif // SANITIZER_LINUX_H