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 || SANITIZER_NETBSD || \
18 SANITIZER_OPENBSD || SANITIZER_SOLARIS
19 #include "sanitizer_common.h"
20 #include "sanitizer_internal_defs.h"
21 #include "sanitizer_platform_limits_netbsd.h"
22 #include "sanitizer_platform_limits_openbsd.h"
23 #include "sanitizer_platform_limits_posix.h"
24 #include "sanitizer_platform_limits_solaris.h"
25 #include "sanitizer_posix.h"
27 struct link_map; // Opaque type returned by dlopen().
29 namespace __sanitizer {
30 // Dirent structure for getdents(). Note that this structure is different from
31 // the one in <dirent.h>, which is used by readdir().
34 struct ProcSelfMapsBuff {
40 struct MemoryMappingLayoutData {
41 ProcSelfMapsBuff proc_self_maps;
45 void ReadProcMaps(ProcSelfMapsBuff *proc_maps);
48 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
49 uptr internal_sigaltstack(const void* ss, void* oss);
50 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
51 __sanitizer_sigset_t *oldset);
52 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp);
54 // Linux-only syscalls.
56 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5);
57 // Used only by sanitizer_stoptheworld. Signal handlers that are actually used
58 // (like the process-wide error reporting SEGV handler) must use
59 // internal_sigaction instead.
60 int internal_sigaction_norestorer(int signum, const void *act, void *oldact);
61 #if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
62 // Uses a raw system call to avoid interceptors.
63 int internal_sigaction_syscall(int signum, const void *act, void *oldact);
65 void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
66 #if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \
67 || defined(__powerpc64__) || defined(__s390__) || defined(__i386__) \
69 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
70 int *parent_tidptr, void *newtls, int *child_tidptr);
72 #endif // SANITIZER_LINUX
74 // This class reads thread IDs from /proc/<pid>/task using only syscalls.
77 explicit ThreadLister(pid_t pid);
84 Result ListThreads(InternalMmapVector<tid_t> *threads);
87 bool IsAlive(int tid);
91 InternalMmapVector<char> buffer_;
94 // Exposed for testing.
95 uptr ThreadDescriptorSize();
97 uptr ThreadSelfOffset();
99 // Matches a library's file name against a base name (stripping path and version
101 bool LibraryNameIs(const char *full_name, const char *base_name);
103 // Call cb for each region mapped by map.
104 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr));
106 #if SANITIZER_ANDROID
108 #if defined(__aarch64__)
109 # define __get_tls() \
110 ({ void** __v; __asm__("mrs %0, tpidr_el0" : "=r"(__v)); __v; })
111 #elif defined(__arm__)
112 # define __get_tls() \
113 ({ void** __v; __asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__v)); __v; })
114 #elif defined(__mips__)
115 // On mips32r1, this goes via a kernel illegal instruction trap that's
117 # define __get_tls() \
118 ({ register void** __v asm("v1"); \
119 __asm__(".set push\n" \
122 ".set pop\n" : "=r"(__v)); \
124 #elif defined(__i386__)
125 # define __get_tls() \
126 ({ void** __v; __asm__("movl %%gs:0, %0" : "=r"(__v)); __v; })
127 #elif defined(__x86_64__)
128 # define __get_tls() \
129 ({ void** __v; __asm__("mov %%fs:0, %0" : "=r"(__v)); __v; })
131 #error "Unsupported architecture."
134 // The Android Bionic team has allocated a TLS slot for TSan starting with N,
135 // given that Android currently doesn't support ELF TLS. It is used to store
136 // Sanitizers thread specific data.
137 static const int TLS_SLOT_TSAN = 8;
139 ALWAYS_INLINE uptr *get_android_tls_ptr() {
140 return reinterpret_cast<uptr *>(&__get_tls()[TLS_SLOT_TSAN]);
143 #endif // SANITIZER_ANDROID
145 } // namespace __sanitizer
148 #endif // SANITIZER_LINUX_H