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