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 || \
19 #include "sanitizer_common.h"
20 #include "sanitizer_internal_defs.h"
21 #include "sanitizer_platform_limits_netbsd.h"
22 #include "sanitizer_platform_limits_posix.h"
23 #include "sanitizer_platform_limits_solaris.h"
24 #include "sanitizer_posix.h"
26 struct link_map; // Opaque type returned by dlopen().
28 namespace __sanitizer {
29 // Dirent structure for getdents(). Note that this structure is different from
30 // the one in <dirent.h>, which is used by readdir().
33 struct ProcSelfMapsBuff {
39 struct MemoryMappingLayoutData {
40 ProcSelfMapsBuff proc_self_maps;
44 void ReadProcMaps(ProcSelfMapsBuff *proc_maps);
47 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
48 uptr internal_sigaltstack(const void* ss, void* oss);
49 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
50 __sanitizer_sigset_t *oldset);
51 uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp);
53 // Linux-only syscalls.
55 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5);
56 // Used only by sanitizer_stoptheworld. Signal handlers that are actually used
57 // (like the process-wide error reporting SEGV handler) must use
58 // internal_sigaction instead.
59 int internal_sigaction_norestorer(int signum, const void *act, void *oldact);
60 #if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
61 // Uses a raw system call to avoid interceptors.
62 int internal_sigaction_syscall(int signum, const void *act, void *oldact);
64 void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
65 #if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \
66 || defined(__powerpc64__) || defined(__s390__) || defined(__i386__) \
68 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
69 int *parent_tidptr, void *newtls, int *child_tidptr);
71 #endif // SANITIZER_LINUX
73 // This class reads thread IDs from /proc/<pid>/task using only syscalls.
76 explicit ThreadLister(int pid);
78 // GetNextTID returns -1 if the list of threads is exhausted, or if there has
85 bool GetDirectoryEntries();
89 InternalScopedBuffer<char> buffer_;
91 struct linux_dirent* entry_;
95 // Exposed for testing.
96 uptr ThreadDescriptorSize();
98 uptr ThreadSelfOffset();
100 // Matches a library's file name against a base name (stripping path and version
102 bool LibraryNameIs(const char *full_name, const char *base_name);
104 // Call cb for each region mapped by map.
105 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr));
107 #if SANITIZER_ANDROID
109 #if defined(__aarch64__)
110 # define __get_tls() \
111 ({ void** __v; __asm__("mrs %0, tpidr_el0" : "=r"(__v)); __v; })
112 #elif defined(__arm__)
113 # define __get_tls() \
114 ({ void** __v; __asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__v)); __v; })
115 #elif defined(__mips__)
116 // On mips32r1, this goes via a kernel illegal instruction trap that's
118 # define __get_tls() \
119 ({ register void** __v asm("v1"); \
120 __asm__(".set push\n" \
123 ".set pop\n" : "=r"(__v)); \
125 #elif defined(__i386__)
126 # define __get_tls() \
127 ({ void** __v; __asm__("movl %%gs:0, %0" : "=r"(__v)); __v; })
128 #elif defined(__x86_64__)
129 # define __get_tls() \
130 ({ void** __v; __asm__("mov %%fs:0, %0" : "=r"(__v)); __v; })
132 #error "Unsupported architecture."
135 // The Android Bionic team has allocated a TLS slot for TSan starting with N,
136 // given that Android currently doesn't support ELF TLS. It is used to store
137 // Sanitizers thread specific data.
138 static const int TLS_SLOT_TSAN = 8;
140 ALWAYS_INLINE uptr *get_android_tls_ptr() {
141 return reinterpret_cast<uptr *>(&__get_tls()[TLS_SLOT_TSAN]);
144 #endif // SANITIZER_ANDROID
146 } // namespace __sanitizer
148 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD ||
150 #endif // SANITIZER_LINUX_H